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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET3 Protocol independent device support routines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the non IP parts of dev.c 1.0.19
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
21 *
22 * Changes:
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
34 * drivers
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
44 * call a packet.
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
50 * changes.
51 * Rudi Cilibrasi : Pass the right thing to
52 * set_mac_address()
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
58 * 1 device.
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
66 * the backlog queue.
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
73 */
74
75#include <asm/uaccess.h>
76#include <asm/system.h>
77#include <linux/bitops.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080078#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#include <linux/cpu.h>
80#include <linux/types.h>
81#include <linux/kernel.h>
stephen hemminger08e98972009-11-10 07:20:34 +000082#include <linux/hash.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#include <linux/sched.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080084#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#include <linux/string.h>
86#include <linux/mm.h>
87#include <linux/socket.h>
88#include <linux/sockios.h>
89#include <linux/errno.h>
90#include <linux/interrupt.h>
91#include <linux/if_ether.h>
92#include <linux/netdevice.h>
93#include <linux/etherdevice.h>
Ben Hutchings0187bdf2008-06-19 16:15:47 -070094#include <linux/ethtool.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#include <linux/notifier.h>
96#include <linux/skbuff.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020097#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#include <net/sock.h>
99#include <linux/rtnetlink.h>
100#include <linux/proc_fs.h>
101#include <linux/seq_file.h>
102#include <linux/stat.h>
103#include <linux/if_bridge.h>
Patrick McHardyb863ceb2007-07-14 18:55:06 -0700104#include <linux/if_macvlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105#include <net/dst.h>
106#include <net/pkt_sched.h>
107#include <net/checksum.h>
Arnd Bergmann44540962009-11-26 06:07:08 +0000108#include <net/xfrm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#include <linux/highmem.h>
110#include <linux/init.h>
111#include <linux/kmod.h>
112#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113#include <linux/netpoll.h>
114#include <linux/rcupdate.h>
115#include <linux/delay.h>
Johannes Berg295f4a12007-04-26 20:43:56 -0700116#include <net/wext.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#include <net/iw_handler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#include <asm/current.h>
Steve Grubb5bdb9882005-12-03 08:39:35 -0500119#include <linux/audit.h>
Chris Leechdb217332006-06-17 21:24:58 -0700120#include <linux/dmaengine.h>
Herbert Xuf6a78bf2006-06-22 02:57:17 -0700121#include <linux/err.h>
David S. Millerc7fa9d12006-08-15 16:34:13 -0700122#include <linux/ctype.h>
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700123#include <linux/if_arp.h>
Ben Hutchings6de329e2008-06-16 17:02:28 -0700124#include <linux/if_vlan.h>
David S. Miller8f0f2222008-07-15 03:47:03 -0700125#include <linux/ip.h>
Alexander Duyckad55dca2008-09-20 22:05:50 -0700126#include <net/ip.h>
David S. Miller8f0f2222008-07-15 03:47:03 -0700127#include <linux/ipv6.h>
128#include <linux/in.h>
David S. Millerb6b2fed2008-07-21 09:48:06 -0700129#include <linux/jhash.h>
130#include <linux/random.h>
David S. Miller9cbc1cb2009-06-15 03:02:23 -0700131#include <trace/events/napi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Pavel Emelyanov342709e2007-10-23 21:14:45 -0700133#include "net-sysfs.h"
134
Herbert Xud565b0a2008-12-15 23:38:52 -0800135/* Instead of increasing this, you should create a hash table. */
136#define MAX_GRO_SKBS 8
137
Herbert Xu5d38a072009-01-04 16:13:40 -0800138/* This should be increased if a protocol with a bigger head is added. */
139#define GRO_MAX_HEAD (MAX_HEADER + 128)
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141/*
142 * The list of packet types we will receive (as opposed to discard)
143 * and the routines to invoke.
144 *
145 * Why 16. Because with 16 the only overlap we get on a hash of the
146 * low nibble of the protocol value is RARP/SNAP/X.25.
147 *
148 * NOTE: That is no longer true with the addition of VLAN tags. Not
149 * sure which should go first, but I bet it won't make much
150 * difference if we are running VLANs. The good news is that
151 * this protocol won't be in the list unless compiled in, so
Stephen Hemminger3041a062006-05-26 13:25:24 -0700152 * the average user (w/out VLANs) will not be adversely affected.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 * --BLG
154 *
155 * 0800 IP
156 * 8100 802.1Q VLAN
157 * 0001 802.3
158 * 0002 AX.25
159 * 0004 802.2
160 * 8035 RARP
161 * 0005 SNAP
162 * 0805 X.25
163 * 0806 ARP
164 * 8137 IPX
165 * 0009 Localtalk
166 * 86DD IPv6
167 */
168
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +0800169#define PTYPE_HASH_SIZE (16)
170#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172static DEFINE_SPINLOCK(ptype_lock);
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +0800173static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
Stephen Hemminger6b2bedc2007-03-12 14:33:50 -0700174static struct list_head ptype_all __read_mostly; /* Taps */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176/*
Pavel Emelianov7562f872007-05-03 15:13:45 -0700177 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 * semaphore.
179 *
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800180 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 *
182 * Writers must hold the rtnl semaphore while they loop through the
Pavel Emelianov7562f872007-05-03 15:13:45 -0700183 * dev_base_head list, and hold dev_base_lock for writing when they do the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 * actual updates. This allows pure readers to access the list even
185 * while a writer is preparing to update it.
186 *
187 * To put it another way, dev_base_lock is held for writing only to
188 * protect against pure readers; the rtnl semaphore provides the
189 * protection against other writers.
190 *
191 * See, for example usages, register_netdevice() and
192 * unregister_netdevice(), which must be called with the rtnl
193 * semaphore held.
194 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195DEFINE_RWLOCK(dev_base_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196EXPORT_SYMBOL(dev_base_lock);
197
Eric W. Biederman881d9662007-09-17 11:56:21 -0700198static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
200 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
stephen hemminger08e98972009-11-10 07:20:34 +0000201 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
203
Eric W. Biederman881d9662007-09-17 11:56:21 -0700204static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700206 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
Changli Gao152102c2010-03-30 20:16:22 +0000209static inline void rps_lock(struct softnet_data *queue)
210{
211#ifdef CONFIG_RPS
212 spin_lock(&queue->input_pkt_queue.lock);
213#endif
214}
215
216static inline void rps_unlock(struct softnet_data *queue)
217{
218#ifdef CONFIG_RPS
219 spin_unlock(&queue->input_pkt_queue.lock);
220#endif
221}
222
Eric W. Biedermance286d32007-09-12 13:53:49 +0200223/* Device list insertion */
224static int list_netdevice(struct net_device *dev)
225{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900226 struct net *net = dev_net(dev);
Eric W. Biedermance286d32007-09-12 13:53:49 +0200227
228 ASSERT_RTNL();
229
230 write_lock_bh(&dev_base_lock);
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800231 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
Eric Dumazet72c95282009-10-30 07:11:27 +0000232 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
Eric Dumazetfb699dfd2009-10-19 19:18:49 +0000233 hlist_add_head_rcu(&dev->index_hlist,
234 dev_index_hash(net, dev->ifindex));
Eric W. Biedermance286d32007-09-12 13:53:49 +0200235 write_unlock_bh(&dev_base_lock);
236 return 0;
237}
238
Eric Dumazetfb699dfd2009-10-19 19:18:49 +0000239/* Device list removal
240 * caller must respect a RCU grace period before freeing/reusing dev
241 */
Eric W. Biedermance286d32007-09-12 13:53:49 +0200242static void unlist_netdevice(struct net_device *dev)
243{
244 ASSERT_RTNL();
245
246 /* Unlink dev from the device chain */
247 write_lock_bh(&dev_base_lock);
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800248 list_del_rcu(&dev->dev_list);
Eric Dumazet72c95282009-10-30 07:11:27 +0000249 hlist_del_rcu(&dev->name_hlist);
Eric Dumazetfb699dfd2009-10-19 19:18:49 +0000250 hlist_del_rcu(&dev->index_hlist);
Eric W. Biedermance286d32007-09-12 13:53:49 +0200251 write_unlock_bh(&dev_base_lock);
252}
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254/*
255 * Our notifier list
256 */
257
Alan Sternf07d5b92006-05-09 15:23:03 -0700258static RAW_NOTIFIER_HEAD(netdev_chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260/*
261 * Device drivers call our routines to queue packets here. We empty the
262 * queue in the local softnet handler.
263 */
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700264
265DEFINE_PER_CPU(struct softnet_data, softnet_data);
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700266EXPORT_PER_CPU_SYMBOL(softnet_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
David S. Millercf508b12008-07-22 14:16:42 -0700268#ifdef CONFIG_LOCKDEP
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700269/*
David S. Millerc773e842008-07-08 23:13:53 -0700270 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700271 * according to dev->type
272 */
273static const unsigned short netdev_lock_type[] =
274 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
275 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
276 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
277 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
278 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
279 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
280 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
281 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
282 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
283 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
284 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
285 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
286 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
Rémi Denis-Courmont2d91d782008-12-17 15:47:29 -0800287 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
Dmitry Eremin-Solenikov929122c2009-08-14 20:00:20 +0400288 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
Sergey Lapinfcb94e42009-06-08 12:18:47 +0000289 ARPHRD_VOID, ARPHRD_NONE};
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700290
Jan Engelhardt36cbd3d2009-08-05 10:42:58 -0700291static const char *const netdev_lock_name[] =
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700292 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
293 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
294 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
295 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
296 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
297 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
298 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
299 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
300 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
301 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
302 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
303 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
304 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
Rémi Denis-Courmont2d91d782008-12-17 15:47:29 -0800305 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
Dmitry Eremin-Solenikov929122c2009-08-14 20:00:20 +0400306 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
Sergey Lapinfcb94e42009-06-08 12:18:47 +0000307 "_xmit_VOID", "_xmit_NONE"};
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700308
309static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
David S. Millercf508b12008-07-22 14:16:42 -0700310static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700311
312static inline unsigned short netdev_lock_pos(unsigned short dev_type)
313{
314 int i;
315
316 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
317 if (netdev_lock_type[i] == dev_type)
318 return i;
319 /* the last key is used by default */
320 return ARRAY_SIZE(netdev_lock_type) - 1;
321}
322
David S. Millercf508b12008-07-22 14:16:42 -0700323static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
324 unsigned short dev_type)
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700325{
326 int i;
327
328 i = netdev_lock_pos(dev_type);
329 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
330 netdev_lock_name[i]);
331}
David S. Millercf508b12008-07-22 14:16:42 -0700332
333static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
334{
335 int i;
336
337 i = netdev_lock_pos(dev->type);
338 lockdep_set_class_and_name(&dev->addr_list_lock,
339 &netdev_addr_lock_key[i],
340 netdev_lock_name[i]);
341}
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700342#else
David S. Millercf508b12008-07-22 14:16:42 -0700343static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
344 unsigned short dev_type)
345{
346}
347static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700348{
349}
350#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352/*******************************************************************************
353
354 Protocol management and registration routines
355
356*******************************************************************************/
357
358/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 * Add a protocol ID to the list. Now that the input handler is
360 * smarter we can dispense with all the messy stuff that used to be
361 * here.
362 *
363 * BEWARE!!! Protocol handlers, mangling input packets,
364 * MUST BE last in hash buckets and checking protocol handlers
365 * MUST start from promiscuous ptype_all chain in net_bh.
366 * It is true now, do not change it.
367 * Explanation follows: if protocol handler, mangling packet, will
368 * be the first on list, it is not able to sense, that packet
369 * is cloned and should be copied-on-write, so that it will
370 * change it and subsequent readers will get broken packet.
371 * --ANK (980803)
372 */
373
374/**
375 * dev_add_pack - add packet handler
376 * @pt: packet type declaration
377 *
378 * Add a protocol handler to the networking stack. The passed &packet_type
379 * is linked into kernel lists and may not be freed until it has been
380 * removed from the kernel lists.
381 *
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900382 * This call does not sleep therefore it can not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 * guarantee all CPU's that are in middle of receiving packets
384 * will see the new packet type (until the next received packet).
385 */
386
387void dev_add_pack(struct packet_type *pt)
388{
389 int hash;
390
391 spin_lock_bh(&ptype_lock);
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -0700392 if (pt->type == htons(ETH_P_ALL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 list_add_rcu(&pt->list, &ptype_all);
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -0700394 else {
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +0800395 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 list_add_rcu(&pt->list, &ptype_base[hash]);
397 }
398 spin_unlock_bh(&ptype_lock);
399}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700400EXPORT_SYMBOL(dev_add_pack);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402/**
403 * __dev_remove_pack - remove packet handler
404 * @pt: packet type declaration
405 *
406 * Remove a protocol handler that was previously added to the kernel
407 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
408 * from the kernel lists and can be freed or reused once this function
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900409 * returns.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 *
411 * The packet type might still be in use by receivers
412 * and must not be freed until after all the CPU's have gone
413 * through a quiescent state.
414 */
415void __dev_remove_pack(struct packet_type *pt)
416{
417 struct list_head *head;
418 struct packet_type *pt1;
419
420 spin_lock_bh(&ptype_lock);
421
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -0700422 if (pt->type == htons(ETH_P_ALL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 head = &ptype_all;
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -0700424 else
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +0800425 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
427 list_for_each_entry(pt1, head, list) {
428 if (pt == pt1) {
429 list_del_rcu(&pt->list);
430 goto out;
431 }
432 }
433
434 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
435out:
436 spin_unlock_bh(&ptype_lock);
437}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700438EXPORT_SYMBOL(__dev_remove_pack);
439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440/**
441 * dev_remove_pack - remove packet handler
442 * @pt: packet type declaration
443 *
444 * Remove a protocol handler that was previously added to the kernel
445 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
446 * from the kernel lists and can be freed or reused once this function
447 * returns.
448 *
449 * This call sleeps to guarantee that no CPU is looking at the packet
450 * type after return.
451 */
452void dev_remove_pack(struct packet_type *pt)
453{
454 __dev_remove_pack(pt);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 synchronize_net();
457}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700458EXPORT_SYMBOL(dev_remove_pack);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460/******************************************************************************
461
462 Device Boot-time Settings Routines
463
464*******************************************************************************/
465
466/* Boot time configuration table */
467static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
468
469/**
470 * netdev_boot_setup_add - add new setup entry
471 * @name: name of the device
472 * @map: configured settings for the device
473 *
474 * Adds new setup entry to the dev_boot_setup list. The function
475 * returns 0 on error and 1 on success. This is a generic routine to
476 * all netdevices.
477 */
478static int netdev_boot_setup_add(char *name, struct ifmap *map)
479{
480 struct netdev_boot_setup *s;
481 int i;
482
483 s = dev_boot_setup;
484 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
485 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
486 memset(s[i].name, 0, sizeof(s[i].name));
Wang Chen93b3cff2008-07-01 19:57:19 -0700487 strlcpy(s[i].name, name, IFNAMSIZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 memcpy(&s[i].map, map, sizeof(s[i].map));
489 break;
490 }
491 }
492
493 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
494}
495
496/**
497 * netdev_boot_setup_check - check boot time settings
498 * @dev: the netdevice
499 *
500 * Check boot time settings for the device.
501 * The found settings are set for the device to be used
502 * later in the device probing.
503 * Returns 0 if no settings found, 1 if they are.
504 */
505int netdev_boot_setup_check(struct net_device *dev)
506{
507 struct netdev_boot_setup *s = dev_boot_setup;
508 int i;
509
510 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
511 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
Wang Chen93b3cff2008-07-01 19:57:19 -0700512 !strcmp(dev->name, s[i].name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 dev->irq = s[i].map.irq;
514 dev->base_addr = s[i].map.base_addr;
515 dev->mem_start = s[i].map.mem_start;
516 dev->mem_end = s[i].map.mem_end;
517 return 1;
518 }
519 }
520 return 0;
521}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700522EXPORT_SYMBOL(netdev_boot_setup_check);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524
525/**
526 * netdev_boot_base - get address from boot time settings
527 * @prefix: prefix for network device
528 * @unit: id for network device
529 *
530 * Check boot time settings for the base address of device.
531 * The found settings are set for the device to be used
532 * later in the device probing.
533 * Returns 0 if no settings found.
534 */
535unsigned long netdev_boot_base(const char *prefix, int unit)
536{
537 const struct netdev_boot_setup *s = dev_boot_setup;
538 char name[IFNAMSIZ];
539 int i;
540
541 sprintf(name, "%s%d", prefix, unit);
542
543 /*
544 * If device already registered then return base of 1
545 * to indicate not to probe for this interface
546 */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700547 if (__dev_get_by_name(&init_net, name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return 1;
549
550 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
551 if (!strcmp(name, s[i].name))
552 return s[i].map.base_addr;
553 return 0;
554}
555
556/*
557 * Saves at boot time configured settings for any netdevice.
558 */
559int __init netdev_boot_setup(char *str)
560{
561 int ints[5];
562 struct ifmap map;
563
564 str = get_options(str, ARRAY_SIZE(ints), ints);
565 if (!str || !*str)
566 return 0;
567
568 /* Save settings */
569 memset(&map, 0, sizeof(map));
570 if (ints[0] > 0)
571 map.irq = ints[1];
572 if (ints[0] > 1)
573 map.base_addr = ints[2];
574 if (ints[0] > 2)
575 map.mem_start = ints[3];
576 if (ints[0] > 3)
577 map.mem_end = ints[4];
578
579 /* Add new entry to the list */
580 return netdev_boot_setup_add(str, &map);
581}
582
583__setup("netdev=", netdev_boot_setup);
584
585/*******************************************************************************
586
587 Device Interface Subroutines
588
589*******************************************************************************/
590
591/**
592 * __dev_get_by_name - find a device by its name
Randy Dunlapc4ea43c2007-10-12 21:17:49 -0700593 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 * @name: name to find
595 *
596 * Find an interface by name. Must be called under RTNL semaphore
597 * or @dev_base_lock. If the name is found a pointer to the device
598 * is returned. If the name is not found then %NULL is returned. The
599 * reference counters are not incremented so the caller must be
600 * careful with locks.
601 */
602
Eric W. Biederman881d9662007-09-17 11:56:21 -0700603struct net_device *__dev_get_by_name(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604{
605 struct hlist_node *p;
Eric Dumazet0bd8d532009-10-30 01:40:11 -0700606 struct net_device *dev;
607 struct hlist_head *head = dev_name_hash(net, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Eric Dumazet0bd8d532009-10-30 01:40:11 -0700609 hlist_for_each_entry(dev, p, head, name_hlist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 if (!strncmp(dev->name, name, IFNAMSIZ))
611 return dev;
Eric Dumazet0bd8d532009-10-30 01:40:11 -0700612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 return NULL;
614}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700615EXPORT_SYMBOL(__dev_get_by_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
617/**
Eric Dumazet72c95282009-10-30 07:11:27 +0000618 * dev_get_by_name_rcu - find a device by its name
619 * @net: the applicable net namespace
620 * @name: name to find
621 *
622 * Find an interface by name.
623 * If the name is found a pointer to the device is returned.
624 * If the name is not found then %NULL is returned.
625 * The reference counters are not incremented so the caller must be
626 * careful with locks. The caller must hold RCU lock.
627 */
628
629struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
630{
631 struct hlist_node *p;
632 struct net_device *dev;
633 struct hlist_head *head = dev_name_hash(net, name);
634
635 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
636 if (!strncmp(dev->name, name, IFNAMSIZ))
637 return dev;
638
639 return NULL;
640}
641EXPORT_SYMBOL(dev_get_by_name_rcu);
642
643/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 * dev_get_by_name - find a device by its name
Randy Dunlapc4ea43c2007-10-12 21:17:49 -0700645 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 * @name: name to find
647 *
648 * Find an interface by name. This can be called from any
649 * context and does its own locking. The returned handle has
650 * the usage count incremented and the caller must use dev_put() to
651 * release it when it is no longer needed. %NULL is returned if no
652 * matching device is found.
653 */
654
Eric W. Biederman881d9662007-09-17 11:56:21 -0700655struct net_device *dev_get_by_name(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
657 struct net_device *dev;
658
Eric Dumazet72c95282009-10-30 07:11:27 +0000659 rcu_read_lock();
660 dev = dev_get_by_name_rcu(net, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 if (dev)
662 dev_hold(dev);
Eric Dumazet72c95282009-10-30 07:11:27 +0000663 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 return dev;
665}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700666EXPORT_SYMBOL(dev_get_by_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668/**
669 * __dev_get_by_index - find a device by its ifindex
Randy Dunlapc4ea43c2007-10-12 21:17:49 -0700670 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 * @ifindex: index of device
672 *
673 * Search for an interface by index. Returns %NULL if the device
674 * is not found or a pointer to the device. The device has not
675 * had its reference counter increased so the caller must be careful
676 * about locking. The caller must hold either the RTNL semaphore
677 * or @dev_base_lock.
678 */
679
Eric W. Biederman881d9662007-09-17 11:56:21 -0700680struct net_device *__dev_get_by_index(struct net *net, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
682 struct hlist_node *p;
Eric Dumazet0bd8d532009-10-30 01:40:11 -0700683 struct net_device *dev;
684 struct hlist_head *head = dev_index_hash(net, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Eric Dumazet0bd8d532009-10-30 01:40:11 -0700686 hlist_for_each_entry(dev, p, head, index_hlist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 if (dev->ifindex == ifindex)
688 return dev;
Eric Dumazet0bd8d532009-10-30 01:40:11 -0700689
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 return NULL;
691}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700692EXPORT_SYMBOL(__dev_get_by_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
Eric Dumazetfb699dfd2009-10-19 19:18:49 +0000694/**
695 * dev_get_by_index_rcu - find a device by its ifindex
696 * @net: the applicable net namespace
697 * @ifindex: index of device
698 *
699 * Search for an interface by index. Returns %NULL if the device
700 * is not found or a pointer to the device. The device has not
701 * had its reference counter increased so the caller must be careful
702 * about locking. The caller must hold RCU lock.
703 */
704
705struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
706{
707 struct hlist_node *p;
708 struct net_device *dev;
709 struct hlist_head *head = dev_index_hash(net, ifindex);
710
711 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
712 if (dev->ifindex == ifindex)
713 return dev;
714
715 return NULL;
716}
717EXPORT_SYMBOL(dev_get_by_index_rcu);
718
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
720/**
721 * dev_get_by_index - find a device by its ifindex
Randy Dunlapc4ea43c2007-10-12 21:17:49 -0700722 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 * @ifindex: index of device
724 *
725 * Search for an interface by index. Returns NULL if the device
726 * is not found or a pointer to the device. The device returned has
727 * had a reference added and the pointer is safe until the user calls
728 * dev_put to indicate they have finished with it.
729 */
730
Eric W. Biederman881d9662007-09-17 11:56:21 -0700731struct net_device *dev_get_by_index(struct net *net, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732{
733 struct net_device *dev;
734
Eric Dumazetfb699dfd2009-10-19 19:18:49 +0000735 rcu_read_lock();
736 dev = dev_get_by_index_rcu(net, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 if (dev)
738 dev_hold(dev);
Eric Dumazetfb699dfd2009-10-19 19:18:49 +0000739 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 return dev;
741}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700742EXPORT_SYMBOL(dev_get_by_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
744/**
745 * dev_getbyhwaddr - find a device by its hardware address
Randy Dunlapc4ea43c2007-10-12 21:17:49 -0700746 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 * @type: media type of device
748 * @ha: hardware address
749 *
750 * Search for an interface by MAC address. Returns NULL if the device
751 * is not found or a pointer to the device. The caller must hold the
752 * rtnl semaphore. The returned device has not had its ref count increased
753 * and the caller must therefore be careful about locking
754 *
755 * BUGS:
756 * If the API was consistent this would be __dev_get_by_hwaddr
757 */
758
Eric W. Biederman881d9662007-09-17 11:56:21 -0700759struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760{
761 struct net_device *dev;
762
763 ASSERT_RTNL();
764
Denis V. Lunev81103a52007-12-12 10:47:38 -0800765 for_each_netdev(net, dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 if (dev->type == type &&
767 !memcmp(dev->dev_addr, ha, dev->addr_len))
Pavel Emelianov7562f872007-05-03 15:13:45 -0700768 return dev;
769
770 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771}
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300772EXPORT_SYMBOL(dev_getbyhwaddr);
773
Eric W. Biederman881d9662007-09-17 11:56:21 -0700774struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
Patrick McHardy4e9cac22007-05-03 03:28:13 -0700775{
776 struct net_device *dev;
777
778 ASSERT_RTNL();
Eric W. Biederman881d9662007-09-17 11:56:21 -0700779 for_each_netdev(net, dev)
Patrick McHardy4e9cac22007-05-03 03:28:13 -0700780 if (dev->type == type)
Pavel Emelianov7562f872007-05-03 15:13:45 -0700781 return dev;
782
783 return NULL;
Patrick McHardy4e9cac22007-05-03 03:28:13 -0700784}
Patrick McHardy4e9cac22007-05-03 03:28:13 -0700785EXPORT_SYMBOL(__dev_getfirstbyhwtype);
786
Eric W. Biederman881d9662007-09-17 11:56:21 -0700787struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788{
Eric Dumazet99fe3c32010-03-18 11:27:25 +0000789 struct net_device *dev, *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Eric Dumazet99fe3c32010-03-18 11:27:25 +0000791 rcu_read_lock();
792 for_each_netdev_rcu(net, dev)
793 if (dev->type == type) {
794 dev_hold(dev);
795 ret = dev;
796 break;
797 }
798 rcu_read_unlock();
799 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801EXPORT_SYMBOL(dev_getfirstbyhwtype);
802
803/**
804 * dev_get_by_flags - find any device with given flags
Randy Dunlapc4ea43c2007-10-12 21:17:49 -0700805 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 * @if_flags: IFF_* values
807 * @mask: bitmask of bits in if_flags to check
808 *
809 * Search for any interface with the given flags. Returns NULL if a device
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900810 * is not found or a pointer to the device. The device returned has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 * had a reference added and the pointer is safe until the user calls
812 * dev_put to indicate they have finished with it.
813 */
814
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700815struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
816 unsigned short mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817{
Pavel Emelianov7562f872007-05-03 15:13:45 -0700818 struct net_device *dev, *ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
Pavel Emelianov7562f872007-05-03 15:13:45 -0700820 ret = NULL;
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800821 rcu_read_lock();
822 for_each_netdev_rcu(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 if (((dev->flags ^ if_flags) & mask) == 0) {
824 dev_hold(dev);
Pavel Emelianov7562f872007-05-03 15:13:45 -0700825 ret = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 break;
827 }
828 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800829 rcu_read_unlock();
Pavel Emelianov7562f872007-05-03 15:13:45 -0700830 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700832EXPORT_SYMBOL(dev_get_by_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
834/**
835 * dev_valid_name - check if name is okay for network device
836 * @name: name string
837 *
838 * Network device names need to be valid file names to
David S. Millerc7fa9d12006-08-15 16:34:13 -0700839 * to allow sysfs to work. We also disallow any kind of
840 * whitespace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 */
Mitch Williamsc2373ee2005-11-09 10:34:45 -0800842int dev_valid_name(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843{
David S. Millerc7fa9d12006-08-15 16:34:13 -0700844 if (*name == '\0')
845 return 0;
Stephen Hemmingerb6fe17d2006-08-29 17:06:13 -0700846 if (strlen(name) >= IFNAMSIZ)
847 return 0;
David S. Millerc7fa9d12006-08-15 16:34:13 -0700848 if (!strcmp(name, ".") || !strcmp(name, ".."))
849 return 0;
850
851 while (*name) {
852 if (*name == '/' || isspace(*name))
853 return 0;
854 name++;
855 }
856 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700858EXPORT_SYMBOL(dev_valid_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
860/**
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200861 * __dev_alloc_name - allocate a name for a device
862 * @net: network namespace to allocate the device name in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 * @name: name format string
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200864 * @buf: scratch buffer and result name string
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 *
866 * Passed a format string - eg "lt%d" it will try and find a suitable
Stephen Hemminger3041a062006-05-26 13:25:24 -0700867 * id. It scans list of devices to build up a free map, then chooses
868 * the first empty slot. The caller must hold the dev_base or rtnl lock
869 * while allocating the name and adding the device in order to avoid
870 * duplicates.
871 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
872 * Returns the number of the unit assigned or a negative errno code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 */
874
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200875static int __dev_alloc_name(struct net *net, const char *name, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876{
877 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 const char *p;
879 const int max_netdevices = 8*PAGE_SIZE;
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700880 unsigned long *inuse;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 struct net_device *d;
882
883 p = strnchr(name, IFNAMSIZ-1, '%');
884 if (p) {
885 /*
886 * Verify the string as this thing may have come from
887 * the user. There must be either one "%d" and no other "%"
888 * characters.
889 */
890 if (p[1] != 'd' || strchr(p + 2, '%'))
891 return -EINVAL;
892
893 /* Use one page as a bit array of possible slots */
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700894 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 if (!inuse)
896 return -ENOMEM;
897
Eric W. Biederman881d9662007-09-17 11:56:21 -0700898 for_each_netdev(net, d) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 if (!sscanf(d->name, name, &i))
900 continue;
901 if (i < 0 || i >= max_netdevices)
902 continue;
903
904 /* avoid cases where sscanf is not exact inverse of printf */
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200905 snprintf(buf, IFNAMSIZ, name, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 if (!strncmp(buf, d->name, IFNAMSIZ))
907 set_bit(i, inuse);
908 }
909
910 i = find_first_zero_bit(inuse, max_netdevices);
911 free_page((unsigned long) inuse);
912 }
913
Octavian Purdilad9031022009-11-18 02:36:59 +0000914 if (buf != name)
915 snprintf(buf, IFNAMSIZ, name, i);
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200916 if (!__dev_get_by_name(net, buf))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919 /* It is possible to run out of possible slots
920 * when the name is long and there isn't enough space left
921 * for the digits, or if all bits are used.
922 */
923 return -ENFILE;
924}
925
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200926/**
927 * dev_alloc_name - allocate a name for a device
928 * @dev: device
929 * @name: name format string
930 *
931 * Passed a format string - eg "lt%d" it will try and find a suitable
932 * id. It scans list of devices to build up a free map, then chooses
933 * the first empty slot. The caller must hold the dev_base or rtnl lock
934 * while allocating the name and adding the device in order to avoid
935 * duplicates.
936 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
937 * Returns the number of the unit assigned or a negative errno code.
938 */
939
940int dev_alloc_name(struct net_device *dev, const char *name)
941{
942 char buf[IFNAMSIZ];
943 struct net *net;
944 int ret;
945
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900946 BUG_ON(!dev_net(dev));
947 net = dev_net(dev);
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200948 ret = __dev_alloc_name(net, name, buf);
949 if (ret >= 0)
950 strlcpy(dev->name, buf, IFNAMSIZ);
951 return ret;
952}
Eric Dumazetd1b19df2009-09-03 01:29:39 -0700953EXPORT_SYMBOL(dev_alloc_name);
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200954
Octavian Purdilad9031022009-11-18 02:36:59 +0000955static int dev_get_valid_name(struct net *net, const char *name, char *buf,
956 bool fmt)
957{
958 if (!dev_valid_name(name))
959 return -EINVAL;
960
961 if (fmt && strchr(name, '%'))
962 return __dev_alloc_name(net, name, buf);
963 else if (__dev_get_by_name(net, name))
964 return -EEXIST;
965 else if (buf != name)
966 strlcpy(buf, name, IFNAMSIZ);
967
968 return 0;
969}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
971/**
972 * dev_change_name - change name of a device
973 * @dev: device
974 * @newname: name (or format string) must be at least IFNAMSIZ
975 *
976 * Change name of a device, can pass format strings "eth%d".
977 * for wildcarding.
978 */
Stephen Hemmingercf04a4c72008-09-30 02:22:14 -0700979int dev_change_name(struct net_device *dev, const char *newname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980{
Herbert Xufcc5a032007-07-30 17:03:38 -0700981 char oldname[IFNAMSIZ];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 int err = 0;
Herbert Xufcc5a032007-07-30 17:03:38 -0700983 int ret;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700984 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
986 ASSERT_RTNL();
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900987 BUG_ON(!dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900989 net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 if (dev->flags & IFF_UP)
991 return -EBUSY;
992
Stephen Hemmingerc8d90dc2007-10-26 03:53:42 -0700993 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
994 return 0;
995
Herbert Xufcc5a032007-07-30 17:03:38 -0700996 memcpy(oldname, dev->name, IFNAMSIZ);
997
Octavian Purdilad9031022009-11-18 02:36:59 +0000998 err = dev_get_valid_name(net, newname, dev->name, 1);
999 if (err < 0)
1000 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
Herbert Xufcc5a032007-07-30 17:03:38 -07001002rollback:
Eric W. Biederman38918452008-10-27 17:51:47 -07001003 /* For now only devices in the initial network namespace
1004 * are in sysfs.
1005 */
Octavian Purdila09ad9bc2009-11-25 15:14:13 -08001006 if (net_eq(net, &init_net)) {
Eric W. Biederman38918452008-10-27 17:51:47 -07001007 ret = device_rename(&dev->dev, dev->name);
1008 if (ret) {
1009 memcpy(dev->name, oldname, IFNAMSIZ);
1010 return ret;
1011 }
Stephen Hemmingerdcc99772008-05-14 22:33:38 -07001012 }
Herbert Xu7f988ea2007-07-30 16:35:46 -07001013
1014 write_lock_bh(&dev_base_lock);
Eric W. Biederman92749822007-04-03 00:07:30 -06001015 hlist_del(&dev->name_hlist);
Eric Dumazet72c95282009-10-30 07:11:27 +00001016 write_unlock_bh(&dev_base_lock);
1017
1018 synchronize_rcu();
1019
1020 write_lock_bh(&dev_base_lock);
1021 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
Herbert Xu7f988ea2007-07-30 16:35:46 -07001022 write_unlock_bh(&dev_base_lock);
1023
Pavel Emelyanov056925a2007-09-16 15:42:43 -07001024 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
Herbert Xufcc5a032007-07-30 17:03:38 -07001025 ret = notifier_to_errno(ret);
1026
1027 if (ret) {
Eric Dumazet91e9c07b2009-11-15 23:30:24 +00001028 /* err >= 0 after dev_alloc_name() or stores the first errno */
1029 if (err >= 0) {
Herbert Xufcc5a032007-07-30 17:03:38 -07001030 err = ret;
1031 memcpy(dev->name, oldname, IFNAMSIZ);
1032 goto rollback;
Eric Dumazet91e9c07b2009-11-15 23:30:24 +00001033 } else {
1034 printk(KERN_ERR
1035 "%s: name change rollback failed: %d.\n",
1036 dev->name, ret);
Herbert Xufcc5a032007-07-30 17:03:38 -07001037 }
1038 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
1040 return err;
1041}
1042
1043/**
Stephen Hemminger0b815a12008-09-22 21:28:11 -07001044 * dev_set_alias - change ifalias of a device
1045 * @dev: device
1046 * @alias: name up to IFALIASZ
Stephen Hemmingerf0db2752008-09-30 02:23:58 -07001047 * @len: limit of bytes to copy from info
Stephen Hemminger0b815a12008-09-22 21:28:11 -07001048 *
1049 * Set ifalias for a device,
1050 */
1051int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1052{
1053 ASSERT_RTNL();
1054
1055 if (len >= IFALIASZ)
1056 return -EINVAL;
1057
Oliver Hartkopp96ca4a22008-09-23 21:23:19 -07001058 if (!len) {
1059 if (dev->ifalias) {
1060 kfree(dev->ifalias);
1061 dev->ifalias = NULL;
1062 }
1063 return 0;
1064 }
1065
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001066 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
Stephen Hemminger0b815a12008-09-22 21:28:11 -07001067 if (!dev->ifalias)
1068 return -ENOMEM;
1069
1070 strlcpy(dev->ifalias, alias, len+1);
1071 return len;
1072}
1073
1074
1075/**
Stephen Hemminger3041a062006-05-26 13:25:24 -07001076 * netdev_features_change - device changes features
Stephen Hemmingerd8a33ac2005-05-29 14:13:47 -07001077 * @dev: device to cause notification
1078 *
1079 * Called to indicate a device has changed features.
1080 */
1081void netdev_features_change(struct net_device *dev)
1082{
Pavel Emelyanov056925a2007-09-16 15:42:43 -07001083 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
Stephen Hemmingerd8a33ac2005-05-29 14:13:47 -07001084}
1085EXPORT_SYMBOL(netdev_features_change);
1086
1087/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 * netdev_state_change - device changes state
1089 * @dev: device to cause notification
1090 *
1091 * Called to indicate a device has changed state. This function calls
1092 * the notifier chains for netdev_chain and sends a NEWLINK message
1093 * to the routing socket.
1094 */
1095void netdev_state_change(struct net_device *dev)
1096{
1097 if (dev->flags & IFF_UP) {
Pavel Emelyanov056925a2007-09-16 15:42:43 -07001098 call_netdevice_notifiers(NETDEV_CHANGE, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1100 }
1101}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001102EXPORT_SYMBOL(netdev_state_change);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
Jiri Pirko3ca5b402010-03-10 10:29:35 +00001104int netdev_bonding_change(struct net_device *dev, unsigned long event)
Or Gerlitzc1da4ac2008-06-13 18:12:00 -07001105{
Jiri Pirko3ca5b402010-03-10 10:29:35 +00001106 return call_netdevice_notifiers(event, dev);
Or Gerlitzc1da4ac2008-06-13 18:12:00 -07001107}
1108EXPORT_SYMBOL(netdev_bonding_change);
1109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110/**
1111 * dev_load - load a network module
Randy Dunlapc4ea43c2007-10-12 21:17:49 -07001112 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 * @name: name of interface
1114 *
1115 * If a network interface is not present and the process has suitable
1116 * privileges this function loads the module. If module loading is not
1117 * available in this kernel then it becomes a nop.
1118 */
1119
Eric W. Biederman881d9662007-09-17 11:56:21 -07001120void dev_load(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121{
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001122 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
Eric Dumazet72c95282009-10-30 07:11:27 +00001124 rcu_read_lock();
1125 dev = dev_get_by_name_rcu(net, name);
1126 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127
Eric Parisa8f80e82009-08-13 09:44:51 -04001128 if (!dev && capable(CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 request_module("%s", name);
1130}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001131EXPORT_SYMBOL(dev_load);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
Patrick McHardybd380812010-02-26 06:34:53 +00001133static int __dev_open(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134{
Stephen Hemmingerd3147742008-11-19 21:32:24 -08001135 const struct net_device_ops *ops = dev->netdev_ops;
Johannes Berg3b8bcfd2009-05-30 01:39:53 +02001136 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137
Ben Hutchingse46b66b2008-05-08 02:53:17 -07001138 ASSERT_RTNL();
1139
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 * Is it even present?
1142 */
1143 if (!netif_device_present(dev))
1144 return -ENODEV;
1145
Johannes Berg3b8bcfd2009-05-30 01:39:53 +02001146 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1147 ret = notifier_to_errno(ret);
1148 if (ret)
1149 return ret;
1150
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 /*
1152 * Call device private open method
1153 */
1154 set_bit(__LINK_STATE_START, &dev->state);
Jeff Garzikbada3392007-10-23 20:19:37 -07001155
Stephen Hemmingerd3147742008-11-19 21:32:24 -08001156 if (ops->ndo_validate_addr)
1157 ret = ops->ndo_validate_addr(dev);
Jeff Garzikbada3392007-10-23 20:19:37 -07001158
Stephen Hemmingerd3147742008-11-19 21:32:24 -08001159 if (!ret && ops->ndo_open)
1160 ret = ops->ndo_open(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001162 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 * If it went open OK then:
1164 */
1165
Jeff Garzikbada3392007-10-23 20:19:37 -07001166 if (ret)
1167 clear_bit(__LINK_STATE_START, &dev->state);
1168 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 /*
1170 * Set the flags.
1171 */
1172 dev->flags |= IFF_UP;
1173
1174 /*
Dan Williams649274d2009-01-11 00:20:39 -08001175 * Enable NET_DMA
1176 */
David S. Millerb4bd07c2009-02-06 22:06:43 -08001177 net_dmaengine_get();
Dan Williams649274d2009-01-11 00:20:39 -08001178
1179 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 * Initialize multicasting status
1181 */
Patrick McHardy4417da62007-06-27 01:28:10 -07001182 dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
1184 /*
1185 * Wakeup transmit queue engine
1186 */
1187 dev_activate(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 }
Jeff Garzikbada3392007-10-23 20:19:37 -07001189
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 return ret;
1191}
Patrick McHardybd380812010-02-26 06:34:53 +00001192
1193/**
1194 * dev_open - prepare an interface for use.
1195 * @dev: device to open
1196 *
1197 * Takes a device from down to up state. The device's private open
1198 * function is invoked and then the multicast lists are loaded. Finally
1199 * the device is moved into the up state and a %NETDEV_UP message is
1200 * sent to the netdev notifier chain.
1201 *
1202 * Calling this function on an active interface is a nop. On a failure
1203 * a negative errno code is returned.
1204 */
1205int dev_open(struct net_device *dev)
1206{
1207 int ret;
1208
1209 /*
1210 * Is it already up?
1211 */
1212 if (dev->flags & IFF_UP)
1213 return 0;
1214
1215 /*
1216 * Open device
1217 */
1218 ret = __dev_open(dev);
1219 if (ret < 0)
1220 return ret;
1221
1222 /*
1223 * ... and announce new interface.
1224 */
1225 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1226 call_netdevice_notifiers(NETDEV_UP, dev);
1227
1228 return ret;
1229}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001230EXPORT_SYMBOL(dev_open);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
Patrick McHardybd380812010-02-26 06:34:53 +00001232static int __dev_close(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233{
Stephen Hemmingerd3147742008-11-19 21:32:24 -08001234 const struct net_device_ops *ops = dev->netdev_ops;
Patrick McHardybd380812010-02-26 06:34:53 +00001235
Ben Hutchingse46b66b2008-05-08 02:53:17 -07001236 ASSERT_RTNL();
David S. Miller9d5010d2007-09-12 14:33:25 +02001237 might_sleep();
1238
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 /*
1240 * Tell people we are going down, so that they can
1241 * prepare to death, when device is still operating.
1242 */
Pavel Emelyanov056925a2007-09-16 15:42:43 -07001243 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 clear_bit(__LINK_STATE_START, &dev->state);
1246
1247 /* Synchronize to scheduled poll. We cannot touch poll list,
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001248 * it can be even on different cpu. So just clear netif_running().
1249 *
1250 * dev->stop() will invoke napi_disable() on all of it's
1251 * napi_struct instances on this device.
1252 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 smp_mb__after_clear_bit(); /* Commit netif_running(). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254
Matti Linnanvuorid8b2a4d2008-02-12 23:10:11 -08001255 dev_deactivate(dev);
1256
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 /*
1258 * Call the device specific close. This cannot fail.
1259 * Only if device is UP
1260 *
1261 * We allow it to be called even after a DETACH hot-plug
1262 * event.
1263 */
Stephen Hemmingerd3147742008-11-19 21:32:24 -08001264 if (ops->ndo_stop)
1265 ops->ndo_stop(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266
1267 /*
1268 * Device is now down.
1269 */
1270
1271 dev->flags &= ~IFF_UP;
1272
1273 /*
Dan Williams649274d2009-01-11 00:20:39 -08001274 * Shutdown NET_DMA
1275 */
David S. Millerb4bd07c2009-02-06 22:06:43 -08001276 net_dmaengine_put();
Dan Williams649274d2009-01-11 00:20:39 -08001277
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 return 0;
1279}
Patrick McHardybd380812010-02-26 06:34:53 +00001280
1281/**
1282 * dev_close - shutdown an interface.
1283 * @dev: device to shutdown
1284 *
1285 * This function moves an active device into down state. A
1286 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1287 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1288 * chain.
1289 */
1290int dev_close(struct net_device *dev)
1291{
1292 if (!(dev->flags & IFF_UP))
1293 return 0;
1294
1295 __dev_close(dev);
1296
1297 /*
1298 * Tell people we are down
1299 */
1300 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1301 call_netdevice_notifiers(NETDEV_DOWN, dev);
1302
1303 return 0;
1304}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001305EXPORT_SYMBOL(dev_close);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306
1307
Ben Hutchings0187bdf2008-06-19 16:15:47 -07001308/**
1309 * dev_disable_lro - disable Large Receive Offload on a device
1310 * @dev: device
1311 *
1312 * Disable Large Receive Offload (LRO) on a net device. Must be
1313 * called under RTNL. This is needed if received packets may be
1314 * forwarded to another interface.
1315 */
1316void dev_disable_lro(struct net_device *dev)
1317{
1318 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1319 dev->ethtool_ops->set_flags) {
1320 u32 flags = dev->ethtool_ops->get_flags(dev);
1321 if (flags & ETH_FLAG_LRO) {
1322 flags &= ~ETH_FLAG_LRO;
1323 dev->ethtool_ops->set_flags(dev, flags);
1324 }
1325 }
1326 WARN_ON(dev->features & NETIF_F_LRO);
1327}
1328EXPORT_SYMBOL(dev_disable_lro);
1329
1330
Eric W. Biederman881d9662007-09-17 11:56:21 -07001331static int dev_boot_phase = 1;
1332
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333/*
1334 * Device change register/unregister. These are not inline or static
1335 * as we export them to the world.
1336 */
1337
1338/**
1339 * register_netdevice_notifier - register a network notifier block
1340 * @nb: notifier
1341 *
1342 * Register a notifier to be called when network device events occur.
1343 * The notifier passed is linked into the kernel structures and must
1344 * not be reused until it has been unregistered. A negative errno code
1345 * is returned on a failure.
1346 *
1347 * When registered all registration and up events are replayed
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001348 * to the new notifier to allow device to have a race free
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 * view of the network device list.
1350 */
1351
1352int register_netdevice_notifier(struct notifier_block *nb)
1353{
1354 struct net_device *dev;
Herbert Xufcc5a032007-07-30 17:03:38 -07001355 struct net_device *last;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001356 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 int err;
1358
1359 rtnl_lock();
Alan Sternf07d5b92006-05-09 15:23:03 -07001360 err = raw_notifier_chain_register(&netdev_chain, nb);
Herbert Xufcc5a032007-07-30 17:03:38 -07001361 if (err)
1362 goto unlock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001363 if (dev_boot_phase)
1364 goto unlock;
1365 for_each_net(net) {
1366 for_each_netdev(net, dev) {
1367 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1368 err = notifier_to_errno(err);
1369 if (err)
1370 goto rollback;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371
Eric W. Biederman881d9662007-09-17 11:56:21 -07001372 if (!(dev->flags & IFF_UP))
1373 continue;
Herbert Xufcc5a032007-07-30 17:03:38 -07001374
Eric W. Biederman881d9662007-09-17 11:56:21 -07001375 nb->notifier_call(nb, NETDEV_UP, dev);
1376 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 }
Herbert Xufcc5a032007-07-30 17:03:38 -07001378
1379unlock:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 rtnl_unlock();
1381 return err;
Herbert Xufcc5a032007-07-30 17:03:38 -07001382
1383rollback:
1384 last = dev;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001385 for_each_net(net) {
1386 for_each_netdev(net, dev) {
1387 if (dev == last)
1388 break;
Herbert Xufcc5a032007-07-30 17:03:38 -07001389
Eric W. Biederman881d9662007-09-17 11:56:21 -07001390 if (dev->flags & IFF_UP) {
1391 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1392 nb->notifier_call(nb, NETDEV_DOWN, dev);
1393 }
1394 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
Eric W. Biedermana5ee1552009-11-29 15:45:58 +00001395 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
Herbert Xufcc5a032007-07-30 17:03:38 -07001396 }
Herbert Xufcc5a032007-07-30 17:03:38 -07001397 }
Pavel Emelyanovc67625a2007-11-14 15:53:16 -08001398
1399 raw_notifier_chain_unregister(&netdev_chain, nb);
Herbert Xufcc5a032007-07-30 17:03:38 -07001400 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001402EXPORT_SYMBOL(register_netdevice_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403
1404/**
1405 * unregister_netdevice_notifier - unregister a network notifier block
1406 * @nb: notifier
1407 *
1408 * Unregister a notifier previously registered by
1409 * register_netdevice_notifier(). The notifier is unlinked into the
1410 * kernel structures and may then be reused. A negative errno code
1411 * is returned on a failure.
1412 */
1413
1414int unregister_netdevice_notifier(struct notifier_block *nb)
1415{
Herbert Xu9f514952006-03-25 01:24:25 -08001416 int err;
1417
1418 rtnl_lock();
Alan Sternf07d5b92006-05-09 15:23:03 -07001419 err = raw_notifier_chain_unregister(&netdev_chain, nb);
Herbert Xu9f514952006-03-25 01:24:25 -08001420 rtnl_unlock();
1421 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001423EXPORT_SYMBOL(unregister_netdevice_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425/**
1426 * call_netdevice_notifiers - call all network notifier blocks
1427 * @val: value passed unmodified to notifier function
Randy Dunlapc4ea43c2007-10-12 21:17:49 -07001428 * @dev: net_device pointer passed unmodified to notifier function
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 *
1430 * Call all network notifier blocks. Parameters and return value
Alan Sternf07d5b92006-05-09 15:23:03 -07001431 * are as for raw_notifier_call_chain().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 */
1433
Eric W. Biedermanad7379d2007-09-16 15:33:32 -07001434int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435{
Eric W. Biedermanad7379d2007-09-16 15:33:32 -07001436 return raw_notifier_call_chain(&netdev_chain, val, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437}
1438
1439/* When > 0 there are consumers of rx skb time stamps */
1440static atomic_t netstamp_needed = ATOMIC_INIT(0);
1441
1442void net_enable_timestamp(void)
1443{
1444 atomic_inc(&netstamp_needed);
1445}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001446EXPORT_SYMBOL(net_enable_timestamp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
1448void net_disable_timestamp(void)
1449{
1450 atomic_dec(&netstamp_needed);
1451}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001452EXPORT_SYMBOL(net_disable_timestamp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001454static inline void net_timestamp(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455{
1456 if (atomic_read(&netstamp_needed))
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001457 __net_timestamp(skb);
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -07001458 else
1459 skb->tstamp.tv64 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460}
1461
Arnd Bergmann44540962009-11-26 06:07:08 +00001462/**
1463 * dev_forward_skb - loopback an skb to another netif
1464 *
1465 * @dev: destination network device
1466 * @skb: buffer to forward
1467 *
1468 * return values:
1469 * NET_RX_SUCCESS (no congestion)
1470 * NET_RX_DROP (packet was dropped)
1471 *
1472 * dev_forward_skb can be used for injecting an skb from the
1473 * start_xmit function of one device into the receive queue
1474 * of another device.
1475 *
1476 * The receiving device may be in another namespace, so
1477 * we have to clear all information in the skb that could
1478 * impact namespace isolation.
1479 */
1480int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1481{
1482 skb_orphan(skb);
1483
1484 if (!(dev->flags & IFF_UP))
1485 return NET_RX_DROP;
1486
1487 if (skb->len > (dev->mtu + dev->hard_header_len))
1488 return NET_RX_DROP;
1489
Arnd Bergmann8a83a002010-01-30 12:23:03 +00001490 skb_set_dev(skb, dev);
Arnd Bergmann44540962009-11-26 06:07:08 +00001491 skb->tstamp.tv64 = 0;
1492 skb->pkt_type = PACKET_HOST;
1493 skb->protocol = eth_type_trans(skb, dev);
Arnd Bergmann44540962009-11-26 06:07:08 +00001494 return netif_rx(skb);
1495}
1496EXPORT_SYMBOL_GPL(dev_forward_skb);
1497
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498/*
1499 * Support routine. Sends outgoing frames to any network
1500 * taps currently in use.
1501 */
1502
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001503static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504{
1505 struct packet_type *ptype;
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001506
Jarek Poplawski8caf1532009-04-17 10:08:49 +00001507#ifdef CONFIG_NET_CLS_ACT
1508 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1509 net_timestamp(skb);
1510#else
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001511 net_timestamp(skb);
Jarek Poplawski8caf1532009-04-17 10:08:49 +00001512#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
1514 rcu_read_lock();
1515 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1516 /* Never send packets back to the socket
1517 * they originated from - MvS (miquels@drinkel.ow.org)
1518 */
1519 if ((ptype->dev == dev || !ptype->dev) &&
1520 (ptype->af_packet_priv == NULL ||
1521 (struct sock *)ptype->af_packet_priv != skb->sk)) {
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001522 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 if (!skb2)
1524 break;
1525
1526 /* skb->nh should be correctly
1527 set by sender, so that the second statement is
1528 just protection against buggy protocols.
1529 */
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07001530 skb_reset_mac_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001532 if (skb_network_header(skb2) < skb2->data ||
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001533 skb2->network_header > skb2->tail) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 if (net_ratelimit())
1535 printk(KERN_CRIT "protocol %04x is "
1536 "buggy, dev %s\n",
1537 skb2->protocol, dev->name);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -07001538 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 }
1540
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001541 skb2->transport_header = skb2->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 skb2->pkt_type = PACKET_OUTGOING;
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001543 ptype->func(skb2, skb->dev, ptype, skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 }
1545 }
1546 rcu_read_unlock();
1547}
1548
Denis Vlasenko56079432006-03-29 15:57:29 -08001549
Jarek Poplawskidef82a12008-08-17 21:54:43 -07001550static inline void __netif_reschedule(struct Qdisc *q)
1551{
1552 struct softnet_data *sd;
1553 unsigned long flags;
1554
1555 local_irq_save(flags);
1556 sd = &__get_cpu_var(softnet_data);
1557 q->next_sched = sd->output_queue;
1558 sd->output_queue = q;
1559 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1560 local_irq_restore(flags);
1561}
1562
David S. Miller37437bb2008-07-16 02:15:04 -07001563void __netif_schedule(struct Qdisc *q)
Denis Vlasenko56079432006-03-29 15:57:29 -08001564{
Jarek Poplawskidef82a12008-08-17 21:54:43 -07001565 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1566 __netif_reschedule(q);
Denis Vlasenko56079432006-03-29 15:57:29 -08001567}
1568EXPORT_SYMBOL(__netif_schedule);
1569
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001570void dev_kfree_skb_irq(struct sk_buff *skb)
Denis Vlasenko56079432006-03-29 15:57:29 -08001571{
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001572 if (atomic_dec_and_test(&skb->users)) {
1573 struct softnet_data *sd;
1574 unsigned long flags;
Denis Vlasenko56079432006-03-29 15:57:29 -08001575
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001576 local_irq_save(flags);
1577 sd = &__get_cpu_var(softnet_data);
1578 skb->next = sd->completion_queue;
1579 sd->completion_queue = skb;
1580 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1581 local_irq_restore(flags);
1582 }
Denis Vlasenko56079432006-03-29 15:57:29 -08001583}
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001584EXPORT_SYMBOL(dev_kfree_skb_irq);
Denis Vlasenko56079432006-03-29 15:57:29 -08001585
1586void dev_kfree_skb_any(struct sk_buff *skb)
1587{
1588 if (in_irq() || irqs_disabled())
1589 dev_kfree_skb_irq(skb);
1590 else
1591 dev_kfree_skb(skb);
1592}
1593EXPORT_SYMBOL(dev_kfree_skb_any);
1594
1595
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001596/**
1597 * netif_device_detach - mark device as removed
1598 * @dev: network device
1599 *
1600 * Mark device as removed from system and therefore no longer available.
1601 */
Denis Vlasenko56079432006-03-29 15:57:29 -08001602void netif_device_detach(struct net_device *dev)
1603{
1604 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1605 netif_running(dev)) {
Alexander Duyckd5431032009-04-08 13:15:22 +00001606 netif_tx_stop_all_queues(dev);
Denis Vlasenko56079432006-03-29 15:57:29 -08001607 }
1608}
1609EXPORT_SYMBOL(netif_device_detach);
1610
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001611/**
1612 * netif_device_attach - mark device as attached
1613 * @dev: network device
1614 *
1615 * Mark device as attached from system and restart if needed.
1616 */
Denis Vlasenko56079432006-03-29 15:57:29 -08001617void netif_device_attach(struct net_device *dev)
1618{
1619 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1620 netif_running(dev)) {
Alexander Duyckd5431032009-04-08 13:15:22 +00001621 netif_tx_wake_all_queues(dev);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001622 __netdev_watchdog_up(dev);
Denis Vlasenko56079432006-03-29 15:57:29 -08001623 }
1624}
1625EXPORT_SYMBOL(netif_device_attach);
1626
Ben Hutchings6de329e2008-06-16 17:02:28 -07001627static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1628{
1629 return ((features & NETIF_F_GEN_CSUM) ||
1630 ((features & NETIF_F_IP_CSUM) &&
1631 protocol == htons(ETH_P_IP)) ||
1632 ((features & NETIF_F_IPV6_CSUM) &&
Yi Zou1c8dbcf2009-02-27 14:06:54 -08001633 protocol == htons(ETH_P_IPV6)) ||
1634 ((features & NETIF_F_FCOE_CRC) &&
1635 protocol == htons(ETH_P_FCOE)));
Ben Hutchings6de329e2008-06-16 17:02:28 -07001636}
1637
1638static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1639{
1640 if (can_checksum_protocol(dev->features, skb->protocol))
1641 return true;
1642
1643 if (skb->protocol == htons(ETH_P_8021Q)) {
1644 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1645 if (can_checksum_protocol(dev->features & dev->vlan_features,
1646 veh->h_vlan_encapsulated_proto))
1647 return true;
1648 }
1649
1650 return false;
1651}
Denis Vlasenko56079432006-03-29 15:57:29 -08001652
Arnd Bergmann8a83a002010-01-30 12:23:03 +00001653/**
1654 * skb_dev_set -- assign a new device to a buffer
1655 * @skb: buffer for the new device
1656 * @dev: network device
1657 *
1658 * If an skb is owned by a device already, we have to reset
1659 * all data private to the namespace a device belongs to
1660 * before assigning it a new device.
1661 */
1662#ifdef CONFIG_NET_NS
1663void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1664{
1665 skb_dst_drop(skb);
1666 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1667 secpath_reset(skb);
1668 nf_reset(skb);
1669 skb_init_secmark(skb);
1670 skb->mark = 0;
1671 skb->priority = 0;
1672 skb->nf_trace = 0;
1673 skb->ipvs_property = 0;
1674#ifdef CONFIG_NET_SCHED
1675 skb->tc_index = 0;
1676#endif
1677 }
1678 skb->dev = dev;
1679}
1680EXPORT_SYMBOL(skb_set_dev);
1681#endif /* CONFIG_NET_NS */
1682
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683/*
1684 * Invalidate hardware checksum when packet is to be mangled, and
1685 * complete checksum manually on outgoing path.
1686 */
Patrick McHardy84fa7932006-08-29 16:44:56 -07001687int skb_checksum_help(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688{
Al Virod3bc23e2006-11-14 21:24:49 -08001689 __wsum csum;
Herbert Xu663ead32007-04-09 11:59:07 -07001690 int ret = 0, offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691
Patrick McHardy84fa7932006-08-29 16:44:56 -07001692 if (skb->ip_summed == CHECKSUM_COMPLETE)
Herbert Xua430a432006-07-08 13:34:56 -07001693 goto out_set_summed;
1694
1695 if (unlikely(skb_shinfo(skb)->gso_size)) {
Herbert Xua430a432006-07-08 13:34:56 -07001696 /* Let GSO fix up the checksum. */
1697 goto out_set_summed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 }
1699
Herbert Xua0308472007-10-15 01:47:15 -07001700 offset = skb->csum_start - skb_headroom(skb);
1701 BUG_ON(offset >= skb_headlen(skb));
1702 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1703
1704 offset += skb->csum_offset;
1705 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1706
1707 if (skb_cloned(skb) &&
1708 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1710 if (ret)
1711 goto out;
1712 }
1713
Herbert Xua0308472007-10-15 01:47:15 -07001714 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
Herbert Xua430a432006-07-08 13:34:56 -07001715out_set_summed:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 skb->ip_summed = CHECKSUM_NONE;
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001717out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718 return ret;
1719}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001720EXPORT_SYMBOL(skb_checksum_help);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001722/**
1723 * skb_gso_segment - Perform segmentation on skb.
1724 * @skb: buffer to segment
Herbert Xu576a30e2006-06-27 13:22:38 -07001725 * @features: features for the output path (see dev->features)
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001726 *
1727 * This function segments the given skb and returns a list of segments.
Herbert Xu576a30e2006-06-27 13:22:38 -07001728 *
1729 * It may return NULL if the skb requires no segmentation. This is
1730 * only possible when GSO is used for verifying header integrity.
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001731 */
Herbert Xu576a30e2006-06-27 13:22:38 -07001732struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001733{
1734 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1735 struct packet_type *ptype;
Al Viro252e3342006-11-14 20:48:11 -08001736 __be16 type = skb->protocol;
Herbert Xua430a432006-07-08 13:34:56 -07001737 int err;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001738
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07001739 skb_reset_mac_header(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001740 skb->mac_len = skb->network_header - skb->mac_header;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001741 __skb_pull(skb, skb->mac_len);
1742
Herbert Xu67fd1a72009-01-19 16:26:44 -08001743 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1744 struct net_device *dev = skb->dev;
1745 struct ethtool_drvinfo info = {};
1746
1747 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1748 dev->ethtool_ops->get_drvinfo(dev, &info);
1749
1750 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1751 "ip_summed=%d",
1752 info.driver, dev ? dev->features : 0L,
1753 skb->sk ? skb->sk->sk_route_caps : 0L,
1754 skb->len, skb->data_len, skb->ip_summed);
1755
Herbert Xua430a432006-07-08 13:34:56 -07001756 if (skb_header_cloned(skb) &&
1757 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1758 return ERR_PTR(err);
1759 }
1760
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001761 rcu_read_lock();
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +08001762 list_for_each_entry_rcu(ptype,
1763 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001764 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
Patrick McHardy84fa7932006-08-29 16:44:56 -07001765 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
Herbert Xua430a432006-07-08 13:34:56 -07001766 err = ptype->gso_send_check(skb);
1767 segs = ERR_PTR(err);
1768 if (err || skb_gso_ok(skb, features))
1769 break;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001770 __skb_push(skb, (skb->data -
1771 skb_network_header(skb)));
Herbert Xua430a432006-07-08 13:34:56 -07001772 }
Herbert Xu576a30e2006-06-27 13:22:38 -07001773 segs = ptype->gso_segment(skb, features);
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001774 break;
1775 }
1776 }
1777 rcu_read_unlock();
1778
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07001779 __skb_push(skb, skb->data - skb_mac_header(skb));
Herbert Xu576a30e2006-06-27 13:22:38 -07001780
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001781 return segs;
1782}
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001783EXPORT_SYMBOL(skb_gso_segment);
1784
Herbert Xufb286bb2005-11-10 13:01:24 -08001785/* Take action when hardware reception checksum errors are detected. */
1786#ifdef CONFIG_BUG
1787void netdev_rx_csum_fault(struct net_device *dev)
1788{
1789 if (net_ratelimit()) {
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001790 printk(KERN_ERR "%s: hw csum failure.\n",
Stephen Hemminger246a4212005-12-08 15:21:39 -08001791 dev ? dev->name : "<unknown>");
Herbert Xufb286bb2005-11-10 13:01:24 -08001792 dump_stack();
1793 }
1794}
1795EXPORT_SYMBOL(netdev_rx_csum_fault);
1796#endif
1797
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798/* Actually, we should eliminate this check as soon as we know, that:
1799 * 1. IOMMU is present and allows to map all the memory.
1800 * 2. No high memory really exists on this machine.
1801 */
1802
1803static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1804{
Herbert Xu3d3a8532006-06-27 13:33:10 -07001805#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 int i;
1807
1808 if (dev->features & NETIF_F_HIGHDMA)
1809 return 0;
1810
1811 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1812 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1813 return 1;
1814
Herbert Xu3d3a8532006-06-27 13:33:10 -07001815#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 return 0;
1817}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001819struct dev_gso_cb {
1820 void (*destructor)(struct sk_buff *skb);
1821};
1822
1823#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1824
1825static void dev_gso_skb_destructor(struct sk_buff *skb)
1826{
1827 struct dev_gso_cb *cb;
1828
1829 do {
1830 struct sk_buff *nskb = skb->next;
1831
1832 skb->next = nskb->next;
1833 nskb->next = NULL;
1834 kfree_skb(nskb);
1835 } while (skb->next);
1836
1837 cb = DEV_GSO_CB(skb);
1838 if (cb->destructor)
1839 cb->destructor(skb);
1840}
1841
1842/**
1843 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1844 * @skb: buffer to segment
1845 *
1846 * This function segments the given skb and stores the list of segments
1847 * in skb->next.
1848 */
1849static int dev_gso_segment(struct sk_buff *skb)
1850{
1851 struct net_device *dev = skb->dev;
1852 struct sk_buff *segs;
Herbert Xu576a30e2006-06-27 13:22:38 -07001853 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1854 NETIF_F_SG : 0);
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001855
Herbert Xu576a30e2006-06-27 13:22:38 -07001856 segs = skb_gso_segment(skb, features);
1857
1858 /* Verifying header integrity only. */
1859 if (!segs)
1860 return 0;
1861
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001862 if (IS_ERR(segs))
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001863 return PTR_ERR(segs);
1864
1865 skb->next = segs;
1866 DEV_GSO_CB(skb)->destructor = skb->destructor;
1867 skb->destructor = dev_gso_skb_destructor;
1868
1869 return 0;
1870}
1871
David S. Millerfd2ea0a2008-07-17 01:56:23 -07001872int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1873 struct netdev_queue *txq)
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001874{
Stephen Hemminger00829822008-11-20 20:14:53 -08001875 const struct net_device_ops *ops = dev->netdev_ops;
Patrick McHardy572a9d72009-11-10 06:14:14 +00001876 int rc = NETDEV_TX_OK;
Stephen Hemminger00829822008-11-20 20:14:53 -08001877
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001878 if (likely(!skb->next)) {
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -07001879 if (!list_empty(&ptype_all))
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001880 dev_queue_xmit_nit(skb, dev);
1881
Herbert Xu576a30e2006-06-27 13:22:38 -07001882 if (netif_needs_gso(dev, skb)) {
1883 if (unlikely(dev_gso_segment(skb)))
1884 goto out_kfree_skb;
1885 if (skb->next)
1886 goto gso;
1887 }
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001888
Eric Dumazet93f154b2009-05-18 22:19:19 -07001889 /*
1890 * If device doesnt need skb->dst, release it right now while
1891 * its hot in this cpu cache
1892 */
Eric Dumazetadf30902009-06-02 05:19:30 +00001893 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1894 skb_dst_drop(skb);
1895
Patrick Ohlyac45f602009-02-12 05:03:37 +00001896 rc = ops->ndo_start_xmit(skb, dev);
Patrick McHardyec634fe2009-07-05 19:23:38 -07001897 if (rc == NETDEV_TX_OK)
Eric Dumazet08baf562009-05-25 22:58:01 -07001898 txq_trans_update(txq);
Patrick Ohlyac45f602009-02-12 05:03:37 +00001899 /*
1900 * TODO: if skb_orphan() was called by
1901 * dev->hard_start_xmit() (for example, the unmodified
1902 * igb driver does that; bnx2 doesn't), then
1903 * skb_tx_software_timestamp() will be unable to send
1904 * back the time stamp.
1905 *
1906 * How can this be prevented? Always create another
1907 * reference to the socket before calling
1908 * dev->hard_start_xmit()? Prevent that skb_orphan()
1909 * does anything in dev->hard_start_xmit() by clearing
1910 * the skb destructor before the call and restoring it
1911 * afterwards, then doing the skb_orphan() ourselves?
1912 */
Patrick Ohlyac45f602009-02-12 05:03:37 +00001913 return rc;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001914 }
1915
Herbert Xu576a30e2006-06-27 13:22:38 -07001916gso:
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001917 do {
1918 struct sk_buff *nskb = skb->next;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001919
1920 skb->next = nskb->next;
1921 nskb->next = NULL;
Krishna Kumar068a2de2009-12-09 20:59:58 +00001922
1923 /*
1924 * If device doesnt need nskb->dst, release it right now while
1925 * its hot in this cpu cache
1926 */
1927 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1928 skb_dst_drop(nskb);
1929
Stephen Hemminger00829822008-11-20 20:14:53 -08001930 rc = ops->ndo_start_xmit(nskb, dev);
Patrick McHardyec634fe2009-07-05 19:23:38 -07001931 if (unlikely(rc != NETDEV_TX_OK)) {
Patrick McHardy572a9d72009-11-10 06:14:14 +00001932 if (rc & ~NETDEV_TX_MASK)
1933 goto out_kfree_gso_skb;
Michael Chanf54d9e82006-06-25 23:57:04 -07001934 nskb->next = skb->next;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001935 skb->next = nskb;
1936 return rc;
1937 }
Eric Dumazet08baf562009-05-25 22:58:01 -07001938 txq_trans_update(txq);
David S. Millerfd2ea0a2008-07-17 01:56:23 -07001939 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
Michael Chanf54d9e82006-06-25 23:57:04 -07001940 return NETDEV_TX_BUSY;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001941 } while (skb->next);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001942
Patrick McHardy572a9d72009-11-10 06:14:14 +00001943out_kfree_gso_skb:
1944 if (likely(skb->next == NULL))
1945 skb->destructor = DEV_GSO_CB(skb)->destructor;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001946out_kfree_skb:
1947 kfree_skb(skb);
Patrick McHardy572a9d72009-11-10 06:14:14 +00001948 return rc;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001949}
1950
Tom Herbert0a9627f2010-03-16 08:03:29 +00001951static u32 hashrnd __read_mostly;
David S. Millerb6b2fed2008-07-21 09:48:06 -07001952
Stephen Hemminger92477442009-03-21 13:39:26 -07001953u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
David S. Miller8f0f2222008-07-15 03:47:03 -07001954{
David S. Miller70192982009-01-27 16:34:47 -08001955 u32 hash;
David S. Millerb6b2fed2008-07-21 09:48:06 -07001956
David S. Miller513de112009-05-03 14:43:10 -07001957 if (skb_rx_queue_recorded(skb)) {
1958 hash = skb_get_rx_queue(skb);
Eric Dumazetd1b19df2009-09-03 01:29:39 -07001959 while (unlikely(hash >= dev->real_num_tx_queues))
David S. Miller513de112009-05-03 14:43:10 -07001960 hash -= dev->real_num_tx_queues;
1961 return hash;
1962 }
Eric Dumazetec581f62009-05-01 09:05:06 -07001963
1964 if (skb->sk && skb->sk->sk_hash)
David S. Miller70192982009-01-27 16:34:47 -08001965 hash = skb->sk->sk_hash;
Eric Dumazetec581f62009-05-01 09:05:06 -07001966 else
David S. Miller70192982009-01-27 16:34:47 -08001967 hash = skb->protocol;
David S. Millerd5a9e242009-01-27 16:22:11 -08001968
Tom Herbert0a9627f2010-03-16 08:03:29 +00001969 hash = jhash_1word(hash, hashrnd);
David S. Millerd5a9e242009-01-27 16:22:11 -08001970
David S. Millerb6b2fed2008-07-21 09:48:06 -07001971 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
David S. Miller8f0f2222008-07-15 03:47:03 -07001972}
Stephen Hemminger92477442009-03-21 13:39:26 -07001973EXPORT_SYMBOL(skb_tx_hash);
David S. Miller8f0f2222008-07-15 03:47:03 -07001974
Eric Dumazeted046422009-11-13 21:54:04 +00001975static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1976{
1977 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1978 if (net_ratelimit()) {
Tom Herbert0a9627f2010-03-16 08:03:29 +00001979 netdev_warn(dev, "selects TX queue %d, but "
Eric Dumazeted046422009-11-13 21:54:04 +00001980 "real number of TX queues is %d\n",
Tom Herbert0a9627f2010-03-16 08:03:29 +00001981 queue_index, dev->real_num_tx_queues);
Eric Dumazeted046422009-11-13 21:54:04 +00001982 }
1983 return 0;
1984 }
1985 return queue_index;
1986}
1987
David S. Millere8a04642008-07-17 00:34:19 -07001988static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1989 struct sk_buff *skb)
1990{
Krishna Kumara4ee3ce2009-10-19 23:50:07 +00001991 u16 queue_index;
1992 struct sock *sk = skb->sk;
David S. Millerfd2ea0a2008-07-17 01:56:23 -07001993
Krishna Kumara4ee3ce2009-10-19 23:50:07 +00001994 if (sk_tx_queue_recorded(sk)) {
1995 queue_index = sk_tx_queue_get(sk);
1996 } else {
1997 const struct net_device_ops *ops = dev->netdev_ops;
1998
1999 if (ops->ndo_select_queue) {
2000 queue_index = ops->ndo_select_queue(dev, skb);
Eric Dumazeted046422009-11-13 21:54:04 +00002001 queue_index = dev_cap_txqueue(dev, queue_index);
Krishna Kumara4ee3ce2009-10-19 23:50:07 +00002002 } else {
2003 queue_index = 0;
2004 if (dev->real_num_tx_queues > 1)
2005 queue_index = skb_tx_hash(dev, skb);
2006
2007 if (sk && sk->sk_dst_cache)
2008 sk_tx_queue_set(sk, queue_index);
2009 }
2010 }
David S. Millereae792b2008-07-15 03:03:33 -07002011
David S. Millerfd2ea0a2008-07-17 01:56:23 -07002012 skb_set_queue_mapping(skb, queue_index);
2013 return netdev_get_tx_queue(dev, queue_index);
David S. Millere8a04642008-07-17 00:34:19 -07002014}
2015
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +00002016static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2017 struct net_device *dev,
2018 struct netdev_queue *txq)
2019{
2020 spinlock_t *root_lock = qdisc_lock(q);
2021 int rc;
2022
2023 spin_lock(root_lock);
2024 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2025 kfree_skb(skb);
2026 rc = NET_XMIT_DROP;
2027 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2028 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
2029 /*
2030 * This is a work-conserving queue; there are no old skbs
2031 * waiting to be sent out; and the qdisc is not running -
2032 * xmit the skb directly.
2033 */
2034 __qdisc_update_bstats(q, skb->len);
2035 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
2036 __qdisc_run(q);
2037 else
2038 clear_bit(__QDISC_STATE_RUNNING, &q->state);
2039
2040 rc = NET_XMIT_SUCCESS;
2041 } else {
2042 rc = qdisc_enqueue_root(skb, q);
2043 qdisc_run(q);
2044 }
2045 spin_unlock(root_lock);
2046
2047 return rc;
2048}
2049
Krishna Kumar4b258462010-01-21 01:26:29 -08002050/*
2051 * Returns true if either:
2052 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2053 * 2. skb is fragmented and the device does not support SG, or if
2054 * at least one of fragments is in highmem and device does not
2055 * support DMA from it.
2056 */
2057static inline int skb_needs_linearize(struct sk_buff *skb,
2058 struct net_device *dev)
2059{
2060 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2061 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2062 illegal_highdma(dev, skb)));
2063}
2064
Dave Jonesd29f7492008-07-22 14:09:06 -07002065/**
2066 * dev_queue_xmit - transmit a buffer
2067 * @skb: buffer to transmit
2068 *
2069 * Queue a buffer for transmission to a network device. The caller must
2070 * have set the device and priority and built the buffer before calling
2071 * this function. The function can be called from an interrupt.
2072 *
2073 * A negative errno code is returned on a failure. A success does not
2074 * guarantee the frame will be transmitted as it may be dropped due
2075 * to congestion or traffic shaping.
2076 *
2077 * -----------------------------------------------------------------------------------
2078 * I notice this method can also return errors from the queue disciplines,
2079 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2080 * be positive.
2081 *
2082 * Regardless of the return value, the skb is consumed, so it is currently
2083 * difficult to retry a send to this method. (You can bump the ref count
2084 * before sending to hold a reference for retry if you are careful.)
2085 *
2086 * When calling this method, interrupts MUST be enabled. This is because
2087 * the BH enable code must have IRQs enabled so that it will not deadlock.
2088 * --BLG
2089 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090int dev_queue_xmit(struct sk_buff *skb)
2091{
2092 struct net_device *dev = skb->dev;
David S. Millerdc2b4842008-07-08 17:18:23 -07002093 struct netdev_queue *txq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 struct Qdisc *q;
2095 int rc = -ENOMEM;
2096
Herbert Xuf6a78bf2006-06-22 02:57:17 -07002097 /* GSO will handle the following emulations directly. */
2098 if (netif_needs_gso(dev, skb))
2099 goto gso;
2100
Krishna Kumar4b258462010-01-21 01:26:29 -08002101 /* Convert a paged skb to linear, if required */
2102 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103 goto out_kfree_skb;
2104
2105 /* If packet is not checksummed and device does not support
2106 * checksumming for this protocol, complete checksumming here.
2107 */
Herbert Xu663ead32007-04-09 11:59:07 -07002108 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2109 skb_set_transport_header(skb, skb->csum_start -
2110 skb_headroom(skb));
Ben Hutchings6de329e2008-06-16 17:02:28 -07002111 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2112 goto out_kfree_skb;
Herbert Xu663ead32007-04-09 11:59:07 -07002113 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114
Herbert Xuf6a78bf2006-06-22 02:57:17 -07002115gso:
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002116 /* Disable soft irqs for various locks below. Also
2117 * stops preemption for RCU.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002119 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120
David S. Millereae792b2008-07-15 03:03:33 -07002121 txq = dev_pick_tx(dev, skb);
Paul E. McKenneya898def2010-02-22 17:04:49 -08002122 q = rcu_dereference_bh(txq->qdisc);
David S. Miller37437bb2008-07-16 02:15:04 -07002123
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124#ifdef CONFIG_NET_CLS_ACT
Eric Dumazetd1b19df2009-09-03 01:29:39 -07002125 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126#endif
2127 if (q->enqueue) {
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +00002128 rc = __dev_xmit_skb(skb, q, dev, txq);
David S. Miller37437bb2008-07-16 02:15:04 -07002129 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130 }
2131
2132 /* The device has no queue. Common case for software devices:
2133 loopback, all the sorts of tunnels...
2134
Herbert Xu932ff272006-06-09 12:20:56 -07002135 Really, it is unlikely that netif_tx_lock protection is necessary
2136 here. (f.e. loopback and IP tunnels are clean ignoring statistics
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137 counters.)
2138 However, it is possible, that they rely on protection
2139 made by us here.
2140
2141 Check this and shot the lock. It is not prone from deadlocks.
2142 Either shot noqueue qdisc, it is even simpler 8)
2143 */
2144 if (dev->flags & IFF_UP) {
2145 int cpu = smp_processor_id(); /* ok because BHs are off */
2146
David S. Millerc773e842008-07-08 23:13:53 -07002147 if (txq->xmit_lock_owner != cpu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148
David S. Millerc773e842008-07-08 23:13:53 -07002149 HARD_TX_LOCK(dev, txq, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150
David S. Millerfd2ea0a2008-07-17 01:56:23 -07002151 if (!netif_tx_queue_stopped(txq)) {
Patrick McHardy572a9d72009-11-10 06:14:14 +00002152 rc = dev_hard_start_xmit(skb, dev, txq);
2153 if (dev_xmit_complete(rc)) {
David S. Millerc773e842008-07-08 23:13:53 -07002154 HARD_TX_UNLOCK(dev, txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 goto out;
2156 }
2157 }
David S. Millerc773e842008-07-08 23:13:53 -07002158 HARD_TX_UNLOCK(dev, txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 if (net_ratelimit())
2160 printk(KERN_CRIT "Virtual device %s asks to "
2161 "queue packet!\n", dev->name);
2162 } else {
2163 /* Recursion is detected! It is possible,
2164 * unfortunately */
2165 if (net_ratelimit())
2166 printk(KERN_CRIT "Dead loop on virtual device "
2167 "%s, fix it urgently!\n", dev->name);
2168 }
2169 }
2170
2171 rc = -ENETDOWN;
Herbert Xud4828d82006-06-22 02:28:18 -07002172 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173
2174out_kfree_skb:
2175 kfree_skb(skb);
2176 return rc;
2177out:
Herbert Xud4828d82006-06-22 02:28:18 -07002178 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 return rc;
2180}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07002181EXPORT_SYMBOL(dev_queue_xmit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182
2183
2184/*=======================================================================
2185 Receiver routines
2186 =======================================================================*/
2187
Stephen Hemminger6b2bedc2007-03-12 14:33:50 -07002188int netdev_max_backlog __read_mostly = 1000;
2189int netdev_budget __read_mostly = 300;
2190int weight_p __read_mostly = 64; /* old backlog weight */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191
2192DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
2193
Eric Dumazetdf334542010-03-24 19:13:54 +00002194#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00002195/*
2196 * get_rps_cpu is called from netif_receive_skb and returns the target
2197 * CPU from the RPS map of the receiving queue for a given skb.
2198 */
2199static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb)
2200{
2201 struct ipv6hdr *ip6;
2202 struct iphdr *ip;
2203 struct netdev_rx_queue *rxqueue;
2204 struct rps_map *map;
2205 int cpu = -1;
2206 u8 ip_proto;
2207 u32 addr1, addr2, ports, ihl;
2208
2209 rcu_read_lock();
2210
2211 if (skb_rx_queue_recorded(skb)) {
2212 u16 index = skb_get_rx_queue(skb);
2213 if (unlikely(index >= dev->num_rx_queues)) {
2214 if (net_ratelimit()) {
2215 netdev_warn(dev, "received packet on queue "
2216 "%u, but number of RX queues is %u\n",
2217 index, dev->num_rx_queues);
2218 }
2219 goto done;
2220 }
2221 rxqueue = dev->_rx + index;
2222 } else
2223 rxqueue = dev->_rx;
2224
2225 if (!rxqueue->rps_map)
2226 goto done;
2227
2228 if (skb->rxhash)
2229 goto got_hash; /* Skip hash computation on packet header */
2230
2231 switch (skb->protocol) {
2232 case __constant_htons(ETH_P_IP):
2233 if (!pskb_may_pull(skb, sizeof(*ip)))
2234 goto done;
2235
2236 ip = (struct iphdr *) skb->data;
2237 ip_proto = ip->protocol;
2238 addr1 = ip->saddr;
2239 addr2 = ip->daddr;
2240 ihl = ip->ihl;
2241 break;
2242 case __constant_htons(ETH_P_IPV6):
2243 if (!pskb_may_pull(skb, sizeof(*ip6)))
2244 goto done;
2245
2246 ip6 = (struct ipv6hdr *) skb->data;
2247 ip_proto = ip6->nexthdr;
2248 addr1 = ip6->saddr.s6_addr32[3];
2249 addr2 = ip6->daddr.s6_addr32[3];
2250 ihl = (40 >> 2);
2251 break;
2252 default:
2253 goto done;
2254 }
2255 ports = 0;
2256 switch (ip_proto) {
2257 case IPPROTO_TCP:
2258 case IPPROTO_UDP:
2259 case IPPROTO_DCCP:
2260 case IPPROTO_ESP:
2261 case IPPROTO_AH:
2262 case IPPROTO_SCTP:
2263 case IPPROTO_UDPLITE:
2264 if (pskb_may_pull(skb, (ihl * 4) + 4))
2265 ports = *((u32 *) (skb->data + (ihl * 4)));
2266 break;
2267
2268 default:
2269 break;
2270 }
2271
2272 skb->rxhash = jhash_3words(addr1, addr2, ports, hashrnd);
2273 if (!skb->rxhash)
2274 skb->rxhash = 1;
2275
2276got_hash:
2277 map = rcu_dereference(rxqueue->rps_map);
2278 if (map) {
2279 u16 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2280
2281 if (cpu_online(tcpu)) {
2282 cpu = tcpu;
2283 goto done;
2284 }
2285 }
2286
2287done:
2288 rcu_read_unlock();
2289 return cpu;
2290}
2291
2292/*
2293 * This structure holds the per-CPU mask of CPUs for which IPIs are scheduled
2294 * to be sent to kick remote softirq processing. There are two masks since
2295 * the sending of IPIs must be done with interrupts enabled. The select field
2296 * indicates the current mask that enqueue_backlog uses to schedule IPIs.
2297 * select is flipped before net_rps_action is called while still under lock,
2298 * net_rps_action then uses the non-selected mask to send the IPIs and clears
2299 * it without conflicting with enqueue_backlog operation.
2300 */
2301struct rps_remote_softirq_cpus {
2302 cpumask_t mask[2];
2303 int select;
2304};
2305static DEFINE_PER_CPU(struct rps_remote_softirq_cpus, rps_remote_softirq_cpus);
2306
2307/* Called from hardirq (IPI) context */
2308static void trigger_softirq(void *data)
2309{
2310 struct softnet_data *queue = data;
2311 __napi_schedule(&queue->backlog);
2312 __get_cpu_var(netdev_rx_stat).received_rps++;
2313}
Tom Herbert1e94d722010-03-18 17:45:44 -07002314#endif /* CONFIG_SMP */
Tom Herbert0a9627f2010-03-16 08:03:29 +00002315
2316/*
2317 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2318 * queue (may be a remote CPU queue).
2319 */
2320static int enqueue_to_backlog(struct sk_buff *skb, int cpu)
2321{
2322 struct softnet_data *queue;
2323 unsigned long flags;
2324
2325 queue = &per_cpu(softnet_data, cpu);
2326
2327 local_irq_save(flags);
2328 __get_cpu_var(netdev_rx_stat).total++;
2329
Changli Gao152102c2010-03-30 20:16:22 +00002330 rps_lock(queue);
Tom Herbert0a9627f2010-03-16 08:03:29 +00002331 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
2332 if (queue->input_pkt_queue.qlen) {
2333enqueue:
2334 __skb_queue_tail(&queue->input_pkt_queue, skb);
Changli Gao152102c2010-03-30 20:16:22 +00002335 rps_unlock(queue);
2336 local_irq_restore(flags);
Tom Herbert0a9627f2010-03-16 08:03:29 +00002337 return NET_RX_SUCCESS;
2338 }
2339
2340 /* Schedule NAPI for backlog device */
2341 if (napi_schedule_prep(&queue->backlog)) {
Eric Dumazetdf334542010-03-24 19:13:54 +00002342#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00002343 if (cpu != smp_processor_id()) {
2344 struct rps_remote_softirq_cpus *rcpus =
2345 &__get_cpu_var(rps_remote_softirq_cpus);
2346
2347 cpu_set(cpu, rcpus->mask[rcpus->select]);
2348 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2349 } else
2350 __napi_schedule(&queue->backlog);
Tom Herbert1e94d722010-03-18 17:45:44 -07002351#else
2352 __napi_schedule(&queue->backlog);
2353#endif
Tom Herbert0a9627f2010-03-16 08:03:29 +00002354 }
2355 goto enqueue;
2356 }
2357
Changli Gao152102c2010-03-30 20:16:22 +00002358 rps_unlock(queue);
Tom Herbert0a9627f2010-03-16 08:03:29 +00002359
2360 __get_cpu_var(netdev_rx_stat).dropped++;
2361 local_irq_restore(flags);
2362
2363 kfree_skb(skb);
2364 return NET_RX_DROP;
2365}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367/**
2368 * netif_rx - post buffer to the network code
2369 * @skb: buffer to post
2370 *
2371 * This function receives a packet from a device driver and queues it for
2372 * the upper (protocol) levels to process. It always succeeds. The buffer
2373 * may be dropped during processing for congestion control or by the
2374 * protocol layers.
2375 *
2376 * return values:
2377 * NET_RX_SUCCESS (no congestion)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378 * NET_RX_DROP (packet was dropped)
2379 *
2380 */
2381
2382int netif_rx(struct sk_buff *skb)
2383{
Tom Herbert0a9627f2010-03-16 08:03:29 +00002384 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385
2386 /* if netpoll wants it, pretend we never saw it */
2387 if (netpoll_rx(skb))
2388 return NET_RX_DROP;
2389
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -07002390 if (!skb->tstamp.tv64)
Patrick McHardya61bbcf2005-08-14 17:24:31 -07002391 net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392
Eric Dumazetdf334542010-03-24 19:13:54 +00002393#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00002394 cpu = get_rps_cpu(skb->dev, skb);
2395 if (cpu < 0)
2396 cpu = smp_processor_id();
Tom Herbert1e94d722010-03-18 17:45:44 -07002397#else
2398 cpu = smp_processor_id();
2399#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400
Tom Herbert0a9627f2010-03-16 08:03:29 +00002401 return enqueue_to_backlog(skb, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002402}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07002403EXPORT_SYMBOL(netif_rx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404
2405int netif_rx_ni(struct sk_buff *skb)
2406{
2407 int err;
2408
2409 preempt_disable();
2410 err = netif_rx(skb);
2411 if (local_softirq_pending())
2412 do_softirq();
2413 preempt_enable();
2414
2415 return err;
2416}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417EXPORT_SYMBOL(netif_rx_ni);
2418
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419static void net_tx_action(struct softirq_action *h)
2420{
2421 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2422
2423 if (sd->completion_queue) {
2424 struct sk_buff *clist;
2425
2426 local_irq_disable();
2427 clist = sd->completion_queue;
2428 sd->completion_queue = NULL;
2429 local_irq_enable();
2430
2431 while (clist) {
2432 struct sk_buff *skb = clist;
2433 clist = clist->next;
2434
Ilpo Järvinen547b7922008-07-25 21:43:18 -07002435 WARN_ON(atomic_read(&skb->users));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 __kfree_skb(skb);
2437 }
2438 }
2439
2440 if (sd->output_queue) {
David S. Miller37437bb2008-07-16 02:15:04 -07002441 struct Qdisc *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442
2443 local_irq_disable();
2444 head = sd->output_queue;
2445 sd->output_queue = NULL;
2446 local_irq_enable();
2447
2448 while (head) {
David S. Miller37437bb2008-07-16 02:15:04 -07002449 struct Qdisc *q = head;
2450 spinlock_t *root_lock;
2451
Linus Torvalds1da177e2005-04-16 15:20:36 -07002452 head = head->next_sched;
2453
David S. Miller5fb66222008-08-02 20:02:43 -07002454 root_lock = qdisc_lock(q);
David S. Miller37437bb2008-07-16 02:15:04 -07002455 if (spin_trylock(root_lock)) {
Jarek Poplawskidef82a12008-08-17 21:54:43 -07002456 smp_mb__before_clear_bit();
2457 clear_bit(__QDISC_STATE_SCHED,
2458 &q->state);
David S. Miller37437bb2008-07-16 02:15:04 -07002459 qdisc_run(q);
2460 spin_unlock(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002461 } else {
David S. Miller195648b2008-08-19 04:00:36 -07002462 if (!test_bit(__QDISC_STATE_DEACTIVATED,
Jarek Poplawskie8a83e12008-09-07 18:41:21 -07002463 &q->state)) {
David S. Miller195648b2008-08-19 04:00:36 -07002464 __netif_reschedule(q);
Jarek Poplawskie8a83e12008-09-07 18:41:21 -07002465 } else {
2466 smp_mb__before_clear_bit();
2467 clear_bit(__QDISC_STATE_SCHED,
2468 &q->state);
2469 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002470 }
2471 }
2472 }
2473}
2474
Stephen Hemminger6f05f622007-03-08 20:46:03 -08002475static inline int deliver_skb(struct sk_buff *skb,
2476 struct packet_type *pt_prev,
2477 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478{
2479 atomic_inc(&skb->users);
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002480 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481}
2482
2483#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
Michał Mirosławda678292009-06-05 05:35:28 +00002484
2485#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2486/* This hook is defined here for ATM LANE */
2487int (*br_fdb_test_addr_hook)(struct net_device *dev,
2488 unsigned char *addr) __read_mostly;
Stephen Hemminger4fb019a2009-09-11 11:50:08 -07002489EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
Michał Mirosławda678292009-06-05 05:35:28 +00002490#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491
Stephen Hemminger6229e362007-03-21 13:38:47 -07002492/*
2493 * If bridge module is loaded call bridging hook.
2494 * returns NULL if packet was consumed.
2495 */
2496struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2497 struct sk_buff *skb) __read_mostly;
Stephen Hemminger4fb019a2009-09-11 11:50:08 -07002498EXPORT_SYMBOL_GPL(br_handle_frame_hook);
Michał Mirosławda678292009-06-05 05:35:28 +00002499
Stephen Hemminger6229e362007-03-21 13:38:47 -07002500static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2501 struct packet_type **pt_prev, int *ret,
2502 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503{
2504 struct net_bridge_port *port;
2505
Stephen Hemminger6229e362007-03-21 13:38:47 -07002506 if (skb->pkt_type == PACKET_LOOPBACK ||
2507 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2508 return skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002509
2510 if (*pt_prev) {
Stephen Hemminger6229e362007-03-21 13:38:47 -07002511 *ret = deliver_skb(skb, *pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002512 *pt_prev = NULL;
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002513 }
2514
Stephen Hemminger6229e362007-03-21 13:38:47 -07002515 return br_handle_frame_hook(port, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002516}
2517#else
Stephen Hemminger6229e362007-03-21 13:38:47 -07002518#define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002519#endif
2520
Patrick McHardyb863ceb2007-07-14 18:55:06 -07002521#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2522struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2523EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2524
2525static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2526 struct packet_type **pt_prev,
2527 int *ret,
2528 struct net_device *orig_dev)
2529{
2530 if (skb->dev->macvlan_port == NULL)
2531 return skb;
2532
2533 if (*pt_prev) {
2534 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2535 *pt_prev = NULL;
2536 }
2537 return macvlan_handle_frame_hook(skb);
2538}
2539#else
2540#define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2541#endif
2542
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543#ifdef CONFIG_NET_CLS_ACT
2544/* TODO: Maybe we should just force sch_ingress to be compiled in
2545 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2546 * a compare and 2 stores extra right now if we dont have it on
2547 * but have CONFIG_NET_CLS_ACT
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002548 * NOTE: This doesnt stop any functionality; if you dont have
Linus Torvalds1da177e2005-04-16 15:20:36 -07002549 * the ingress scheduler, you just cant add policies on ingress.
2550 *
2551 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002552static int ing_filter(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002553{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554 struct net_device *dev = skb->dev;
Herbert Xuf697c3e2007-10-14 00:38:47 -07002555 u32 ttl = G_TC_RTTL(skb->tc_verd);
David S. Miller555353c2008-07-08 17:33:13 -07002556 struct netdev_queue *rxq;
2557 int result = TC_ACT_OK;
2558 struct Qdisc *q;
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002559
Herbert Xuf697c3e2007-10-14 00:38:47 -07002560 if (MAX_RED_LOOP < ttl++) {
2561 printk(KERN_WARNING
2562 "Redir loop detected Dropping packet (%d->%d)\n",
Eric Dumazet8964be42009-11-20 15:35:04 -08002563 skb->skb_iif, dev->ifindex);
Herbert Xuf697c3e2007-10-14 00:38:47 -07002564 return TC_ACT_SHOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002565 }
2566
Herbert Xuf697c3e2007-10-14 00:38:47 -07002567 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2568 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2569
David S. Miller555353c2008-07-08 17:33:13 -07002570 rxq = &dev->rx_queue;
2571
David S. Miller83874002008-07-17 00:53:03 -07002572 q = rxq->qdisc;
David S. Miller8d50b532008-07-30 02:37:46 -07002573 if (q != &noop_qdisc) {
David S. Miller83874002008-07-17 00:53:03 -07002574 spin_lock(qdisc_lock(q));
David S. Millera9312ae2008-08-17 21:51:03 -07002575 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2576 result = qdisc_enqueue_root(skb, q);
David S. Miller83874002008-07-17 00:53:03 -07002577 spin_unlock(qdisc_lock(q));
2578 }
Herbert Xuf697c3e2007-10-14 00:38:47 -07002579
Linus Torvalds1da177e2005-04-16 15:20:36 -07002580 return result;
2581}
Herbert Xuf697c3e2007-10-14 00:38:47 -07002582
2583static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2584 struct packet_type **pt_prev,
2585 int *ret, struct net_device *orig_dev)
2586{
David S. Miller8d50b532008-07-30 02:37:46 -07002587 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
Herbert Xuf697c3e2007-10-14 00:38:47 -07002588 goto out;
2589
2590 if (*pt_prev) {
2591 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2592 *pt_prev = NULL;
2593 } else {
2594 /* Huh? Why does turning on AF_PACKET affect this? */
2595 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2596 }
2597
2598 switch (ing_filter(skb)) {
2599 case TC_ACT_SHOT:
2600 case TC_ACT_STOLEN:
2601 kfree_skb(skb);
2602 return NULL;
2603 }
2604
2605out:
2606 skb->tc_verd = 0;
2607 return skb;
2608}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002609#endif
2610
Patrick McHardybc1d0412008-07-14 22:49:30 -07002611/*
2612 * netif_nit_deliver - deliver received packets to network taps
2613 * @skb: buffer
2614 *
2615 * This function is used to deliver incoming packets to network
2616 * taps. It should be used when the normal netif_receive_skb path
2617 * is bypassed, for example because of VLAN acceleration.
2618 */
2619void netif_nit_deliver(struct sk_buff *skb)
2620{
2621 struct packet_type *ptype;
2622
2623 if (list_empty(&ptype_all))
2624 return;
2625
2626 skb_reset_network_header(skb);
2627 skb_reset_transport_header(skb);
2628 skb->mac_len = skb->network_header - skb->mac_header;
2629
2630 rcu_read_lock();
2631 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2632 if (!ptype->dev || ptype->dev == skb->dev)
2633 deliver_skb(skb, ptype, skb->dev);
2634 }
2635 rcu_read_unlock();
2636}
2637
Eric Dumazet10f744d2010-03-28 23:07:20 -07002638static int __netif_receive_skb(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639{
2640 struct packet_type *ptype, *pt_prev;
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002641 struct net_device *orig_dev;
Eric Dumazet0641e4f2010-03-18 21:16:45 -07002642 struct net_device *master;
Joe Eykholt0d7a3682008-07-02 18:22:01 -07002643 struct net_device *null_or_orig;
Andy Gospodarekca8d9ea2010-01-06 12:56:37 +00002644 struct net_device *null_or_bond;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002645 int ret = NET_RX_DROP;
Al Viro252e3342006-11-14 20:48:11 -08002646 __be16 type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647
Eric Dumazet81bbb3d2009-09-30 16:42:42 -07002648 if (!skb->tstamp.tv64)
2649 net_timestamp(skb);
2650
Eric Dumazet05423b22009-10-26 18:40:35 -07002651 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
Patrick McHardy9b22ea52008-11-04 14:49:57 -08002652 return NET_RX_SUCCESS;
2653
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654 /* if we've gotten here through NAPI, check netpoll */
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002655 if (netpoll_receive_skb(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656 return NET_RX_DROP;
2657
Eric Dumazet8964be42009-11-20 15:35:04 -08002658 if (!skb->skb_iif)
2659 skb->skb_iif = skb->dev->ifindex;
David S. Miller86e65da2005-08-09 19:36:29 -07002660
Joe Eykholt0d7a3682008-07-02 18:22:01 -07002661 null_or_orig = NULL;
Joe Eykholtcc9bd5c2008-07-02 18:22:00 -07002662 orig_dev = skb->dev;
Eric Dumazet0641e4f2010-03-18 21:16:45 -07002663 master = ACCESS_ONCE(orig_dev->master);
2664 if (master) {
2665 if (skb_bond_should_drop(skb, master))
Joe Eykholt0d7a3682008-07-02 18:22:01 -07002666 null_or_orig = orig_dev; /* deliver only exact match */
2667 else
Eric Dumazet0641e4f2010-03-18 21:16:45 -07002668 skb->dev = master;
Joe Eykholtcc9bd5c2008-07-02 18:22:00 -07002669 }
Jay Vosburgh8f903c72006-02-21 16:36:44 -08002670
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671 __get_cpu_var(netdev_rx_stat).total++;
2672
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -07002673 skb_reset_network_header(skb);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03002674 skb_reset_transport_header(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07002675 skb->mac_len = skb->network_header - skb->mac_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676
2677 pt_prev = NULL;
2678
2679 rcu_read_lock();
2680
2681#ifdef CONFIG_NET_CLS_ACT
2682 if (skb->tc_verd & TC_NCLS) {
2683 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2684 goto ncls;
2685 }
2686#endif
2687
2688 list_for_each_entry_rcu(ptype, &ptype_all, list) {
Joe Eykholtf9823072008-07-02 18:22:02 -07002689 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2690 ptype->dev == orig_dev) {
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002691 if (pt_prev)
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002692 ret = deliver_skb(skb, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693 pt_prev = ptype;
2694 }
2695 }
2696
2697#ifdef CONFIG_NET_CLS_ACT
Herbert Xuf697c3e2007-10-14 00:38:47 -07002698 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2699 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701ncls:
2702#endif
2703
Stephen Hemminger6229e362007-03-21 13:38:47 -07002704 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2705 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706 goto out;
Patrick McHardyb863ceb2007-07-14 18:55:06 -07002707 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2708 if (!skb)
2709 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710
Andy Gospodarek1f3c8802009-12-14 10:48:58 +00002711 /*
2712 * Make sure frames received on VLAN interfaces stacked on
2713 * bonding interfaces still make their way to any base bonding
2714 * device that may have registered for a specific ptype. The
2715 * handler may have to adjust skb->dev and orig_dev.
Andy Gospodarek1f3c8802009-12-14 10:48:58 +00002716 */
Andy Gospodarekca8d9ea2010-01-06 12:56:37 +00002717 null_or_bond = NULL;
Andy Gospodarek1f3c8802009-12-14 10:48:58 +00002718 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2719 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
Andy Gospodarekca8d9ea2010-01-06 12:56:37 +00002720 null_or_bond = vlan_dev_real_dev(skb->dev);
Andy Gospodarek1f3c8802009-12-14 10:48:58 +00002721 }
2722
Linus Torvalds1da177e2005-04-16 15:20:36 -07002723 type = skb->protocol;
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +08002724 list_for_each_entry_rcu(ptype,
2725 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
Andy Gospodarek1f3c8802009-12-14 10:48:58 +00002726 if (ptype->type == type && (ptype->dev == null_or_orig ||
Andy Gospodarekca8d9ea2010-01-06 12:56:37 +00002727 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2728 ptype->dev == null_or_bond)) {
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002729 if (pt_prev)
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002730 ret = deliver_skb(skb, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002731 pt_prev = ptype;
2732 }
2733 }
2734
2735 if (pt_prev) {
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002736 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002737 } else {
2738 kfree_skb(skb);
2739 /* Jamal, now you will not able to escape explaining
2740 * me how you were going to use this. :-)
2741 */
2742 ret = NET_RX_DROP;
2743 }
2744
2745out:
2746 rcu_read_unlock();
2747 return ret;
2748}
Tom Herbert0a9627f2010-03-16 08:03:29 +00002749
2750/**
2751 * netif_receive_skb - process receive buffer from network
2752 * @skb: buffer to process
2753 *
2754 * netif_receive_skb() is the main receive data processing function.
2755 * It always succeeds. The buffer may be dropped during processing
2756 * for congestion control or by the protocol layers.
2757 *
2758 * This function may only be called from softirq context and interrupts
2759 * should be enabled.
2760 *
2761 * Return values (usually ignored):
2762 * NET_RX_SUCCESS: no congestion
2763 * NET_RX_DROP: packet was dropped
2764 */
2765int netif_receive_skb(struct sk_buff *skb)
2766{
Eric Dumazetdf334542010-03-24 19:13:54 +00002767#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00002768 int cpu;
2769
2770 cpu = get_rps_cpu(skb->dev, skb);
2771
2772 if (cpu < 0)
2773 return __netif_receive_skb(skb);
2774 else
2775 return enqueue_to_backlog(skb, cpu);
Tom Herbert1e94d722010-03-18 17:45:44 -07002776#else
2777 return __netif_receive_skb(skb);
2778#endif
Tom Herbert0a9627f2010-03-16 08:03:29 +00002779}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07002780EXPORT_SYMBOL(netif_receive_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002781
Stephen Hemminger6e583ce2008-08-03 21:29:57 -07002782/* Network device is going away, flush any packets still pending */
Changli Gao152102c2010-03-30 20:16:22 +00002783static void flush_backlog(void *arg)
Stephen Hemminger6e583ce2008-08-03 21:29:57 -07002784{
Changli Gao152102c2010-03-30 20:16:22 +00002785 struct net_device *dev = arg;
2786 struct softnet_data *queue = &__get_cpu_var(softnet_data);
Stephen Hemminger6e583ce2008-08-03 21:29:57 -07002787 struct sk_buff *skb, *tmp;
2788
Changli Gao152102c2010-03-30 20:16:22 +00002789 rps_lock(queue);
Stephen Hemminger6e583ce2008-08-03 21:29:57 -07002790 skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
2791 if (skb->dev == dev) {
2792 __skb_unlink(skb, &queue->input_pkt_queue);
2793 kfree_skb(skb);
2794 }
Changli Gao152102c2010-03-30 20:16:22 +00002795 rps_unlock(queue);
Stephen Hemminger6e583ce2008-08-03 21:29:57 -07002796}
2797
Herbert Xud565b0a2008-12-15 23:38:52 -08002798static int napi_gro_complete(struct sk_buff *skb)
2799{
2800 struct packet_type *ptype;
2801 __be16 type = skb->protocol;
2802 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2803 int err = -ENOENT;
2804
Herbert Xufc59f9a2009-04-14 15:11:06 -07002805 if (NAPI_GRO_CB(skb)->count == 1) {
2806 skb_shinfo(skb)->gso_size = 0;
Herbert Xud565b0a2008-12-15 23:38:52 -08002807 goto out;
Herbert Xufc59f9a2009-04-14 15:11:06 -07002808 }
Herbert Xud565b0a2008-12-15 23:38:52 -08002809
2810 rcu_read_lock();
2811 list_for_each_entry_rcu(ptype, head, list) {
2812 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2813 continue;
2814
2815 err = ptype->gro_complete(skb);
2816 break;
2817 }
2818 rcu_read_unlock();
2819
2820 if (err) {
2821 WARN_ON(&ptype->list == head);
2822 kfree_skb(skb);
2823 return NET_RX_SUCCESS;
2824 }
2825
2826out:
Herbert Xud565b0a2008-12-15 23:38:52 -08002827 return netif_receive_skb(skb);
2828}
2829
David S. Miller11380a42010-01-19 13:46:10 -08002830static void napi_gro_flush(struct napi_struct *napi)
Herbert Xud565b0a2008-12-15 23:38:52 -08002831{
2832 struct sk_buff *skb, *next;
2833
2834 for (skb = napi->gro_list; skb; skb = next) {
2835 next = skb->next;
2836 skb->next = NULL;
2837 napi_gro_complete(skb);
2838 }
2839
Herbert Xu4ae55442009-02-08 18:00:36 +00002840 napi->gro_count = 0;
Herbert Xud565b0a2008-12-15 23:38:52 -08002841 napi->gro_list = NULL;
2842}
Herbert Xud565b0a2008-12-15 23:38:52 -08002843
Ben Hutchings5b252f02009-10-29 07:17:09 +00002844enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
Herbert Xud565b0a2008-12-15 23:38:52 -08002845{
2846 struct sk_buff **pp = NULL;
2847 struct packet_type *ptype;
2848 __be16 type = skb->protocol;
2849 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
Herbert Xu0da2afd52008-12-26 14:57:42 -08002850 int same_flow;
Herbert Xud565b0a2008-12-15 23:38:52 -08002851 int mac_len;
Ben Hutchings5b252f02009-10-29 07:17:09 +00002852 enum gro_result ret;
Herbert Xud565b0a2008-12-15 23:38:52 -08002853
2854 if (!(skb->dev->features & NETIF_F_GRO))
2855 goto normal;
2856
David S. Miller4cf704f2009-06-09 00:18:51 -07002857 if (skb_is_gso(skb) || skb_has_frags(skb))
Herbert Xuf17f5c92009-01-14 14:36:12 -08002858 goto normal;
2859
Herbert Xud565b0a2008-12-15 23:38:52 -08002860 rcu_read_lock();
2861 list_for_each_entry_rcu(ptype, head, list) {
Herbert Xud565b0a2008-12-15 23:38:52 -08002862 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
2863 continue;
2864
Herbert Xu86911732009-01-29 14:19:50 +00002865 skb_set_network_header(skb, skb_gro_offset(skb));
Herbert Xud565b0a2008-12-15 23:38:52 -08002866 mac_len = skb->network_header - skb->mac_header;
2867 skb->mac_len = mac_len;
2868 NAPI_GRO_CB(skb)->same_flow = 0;
2869 NAPI_GRO_CB(skb)->flush = 0;
Herbert Xu5d38a072009-01-04 16:13:40 -08002870 NAPI_GRO_CB(skb)->free = 0;
Herbert Xud565b0a2008-12-15 23:38:52 -08002871
Herbert Xud565b0a2008-12-15 23:38:52 -08002872 pp = ptype->gro_receive(&napi->gro_list, skb);
2873 break;
2874 }
2875 rcu_read_unlock();
2876
2877 if (&ptype->list == head)
2878 goto normal;
2879
Herbert Xu0da2afd52008-12-26 14:57:42 -08002880 same_flow = NAPI_GRO_CB(skb)->same_flow;
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002881 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
Herbert Xu0da2afd52008-12-26 14:57:42 -08002882
Herbert Xud565b0a2008-12-15 23:38:52 -08002883 if (pp) {
2884 struct sk_buff *nskb = *pp;
2885
2886 *pp = nskb->next;
2887 nskb->next = NULL;
2888 napi_gro_complete(nskb);
Herbert Xu4ae55442009-02-08 18:00:36 +00002889 napi->gro_count--;
Herbert Xud565b0a2008-12-15 23:38:52 -08002890 }
2891
Herbert Xu0da2afd52008-12-26 14:57:42 -08002892 if (same_flow)
Herbert Xud565b0a2008-12-15 23:38:52 -08002893 goto ok;
2894
Herbert Xu4ae55442009-02-08 18:00:36 +00002895 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
Herbert Xud565b0a2008-12-15 23:38:52 -08002896 goto normal;
Herbert Xud565b0a2008-12-15 23:38:52 -08002897
Herbert Xu4ae55442009-02-08 18:00:36 +00002898 napi->gro_count++;
Herbert Xud565b0a2008-12-15 23:38:52 -08002899 NAPI_GRO_CB(skb)->count = 1;
Herbert Xu86911732009-01-29 14:19:50 +00002900 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
Herbert Xud565b0a2008-12-15 23:38:52 -08002901 skb->next = napi->gro_list;
2902 napi->gro_list = skb;
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002903 ret = GRO_HELD;
Herbert Xud565b0a2008-12-15 23:38:52 -08002904
Herbert Xuad0f9902009-02-01 01:24:55 -08002905pull:
Herbert Xucb189782009-05-26 18:50:31 +00002906 if (skb_headlen(skb) < skb_gro_offset(skb)) {
2907 int grow = skb_gro_offset(skb) - skb_headlen(skb);
2908
2909 BUG_ON(skb->end - skb->tail < grow);
2910
2911 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
2912
2913 skb->tail += grow;
2914 skb->data_len -= grow;
2915
2916 skb_shinfo(skb)->frags[0].page_offset += grow;
2917 skb_shinfo(skb)->frags[0].size -= grow;
2918
2919 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
2920 put_page(skb_shinfo(skb)->frags[0].page);
2921 memmove(skb_shinfo(skb)->frags,
2922 skb_shinfo(skb)->frags + 1,
2923 --skb_shinfo(skb)->nr_frags);
2924 }
Herbert Xuad0f9902009-02-01 01:24:55 -08002925 }
2926
Herbert Xud565b0a2008-12-15 23:38:52 -08002927ok:
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002928 return ret;
Herbert Xud565b0a2008-12-15 23:38:52 -08002929
2930normal:
Herbert Xuad0f9902009-02-01 01:24:55 -08002931 ret = GRO_NORMAL;
2932 goto pull;
Herbert Xu5d38a072009-01-04 16:13:40 -08002933}
Herbert Xu96e93ea2009-01-06 10:49:34 -08002934EXPORT_SYMBOL(dev_gro_receive);
2935
Ben Hutchings5b252f02009-10-29 07:17:09 +00002936static gro_result_t
2937__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
Herbert Xu96e93ea2009-01-06 10:49:34 -08002938{
2939 struct sk_buff *p;
2940
Herbert Xud1c76af2009-03-16 10:50:02 -07002941 if (netpoll_rx_on(skb))
2942 return GRO_NORMAL;
2943
Herbert Xu96e93ea2009-01-06 10:49:34 -08002944 for (p = napi->gro_list; p; p = p->next) {
Joe Perchesf64f9e72009-11-29 16:55:45 -08002945 NAPI_GRO_CB(p)->same_flow =
2946 (p->dev == skb->dev) &&
2947 !compare_ether_header(skb_mac_header(p),
2948 skb_gro_mac_header(skb));
Herbert Xu96e93ea2009-01-06 10:49:34 -08002949 NAPI_GRO_CB(p)->flush = 0;
2950 }
2951
2952 return dev_gro_receive(napi, skb);
2953}
Herbert Xu5d38a072009-01-04 16:13:40 -08002954
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07002955gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
Herbert Xu5d38a072009-01-04 16:13:40 -08002956{
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002957 switch (ret) {
2958 case GRO_NORMAL:
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07002959 if (netif_receive_skb(skb))
2960 ret = GRO_DROP;
2961 break;
Herbert Xu5d38a072009-01-04 16:13:40 -08002962
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002963 case GRO_DROP:
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002964 case GRO_MERGED_FREE:
Herbert Xu5d38a072009-01-04 16:13:40 -08002965 kfree_skb(skb);
2966 break;
Ben Hutchings5b252f02009-10-29 07:17:09 +00002967
2968 case GRO_HELD:
2969 case GRO_MERGED:
2970 break;
Herbert Xu5d38a072009-01-04 16:13:40 -08002971 }
2972
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07002973 return ret;
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002974}
2975EXPORT_SYMBOL(napi_skb_finish);
2976
Herbert Xu78a478d2009-05-26 18:50:21 +00002977void skb_gro_reset_offset(struct sk_buff *skb)
2978{
2979 NAPI_GRO_CB(skb)->data_offset = 0;
2980 NAPI_GRO_CB(skb)->frag0 = NULL;
Herbert Xu74895942009-05-26 18:50:27 +00002981 NAPI_GRO_CB(skb)->frag0_len = 0;
Herbert Xu78a478d2009-05-26 18:50:21 +00002982
Herbert Xu78d3fd02009-05-26 18:50:23 +00002983 if (skb->mac_header == skb->tail &&
Herbert Xu74895942009-05-26 18:50:27 +00002984 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
Herbert Xu78a478d2009-05-26 18:50:21 +00002985 NAPI_GRO_CB(skb)->frag0 =
2986 page_address(skb_shinfo(skb)->frags[0].page) +
2987 skb_shinfo(skb)->frags[0].page_offset;
Herbert Xu74895942009-05-26 18:50:27 +00002988 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
2989 }
Herbert Xu78a478d2009-05-26 18:50:21 +00002990}
2991EXPORT_SYMBOL(skb_gro_reset_offset);
2992
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07002993gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002994{
Herbert Xu86911732009-01-29 14:19:50 +00002995 skb_gro_reset_offset(skb);
2996
Herbert Xu5d0d9be2009-01-29 14:19:48 +00002997 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
Herbert Xud565b0a2008-12-15 23:38:52 -08002998}
2999EXPORT_SYMBOL(napi_gro_receive);
3000
Herbert Xu96e93ea2009-01-06 10:49:34 -08003001void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3002{
Herbert Xu96e93ea2009-01-06 10:49:34 -08003003 __skb_pull(skb, skb_headlen(skb));
3004 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3005
3006 napi->skb = skb;
3007}
3008EXPORT_SYMBOL(napi_reuse_skb);
3009
Herbert Xu76620aa2009-04-16 02:02:07 -07003010struct sk_buff *napi_get_frags(struct napi_struct *napi)
Herbert Xu5d38a072009-01-04 16:13:40 -08003011{
Herbert Xu5d38a072009-01-04 16:13:40 -08003012 struct sk_buff *skb = napi->skb;
Herbert Xu5d38a072009-01-04 16:13:40 -08003013
3014 if (!skb) {
Eric Dumazet89d71a62009-10-13 05:34:20 +00003015 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3016 if (skb)
3017 napi->skb = skb;
Herbert Xu5d38a072009-01-04 16:13:40 -08003018 }
Herbert Xu96e93ea2009-01-06 10:49:34 -08003019 return skb;
3020}
Herbert Xu76620aa2009-04-16 02:02:07 -07003021EXPORT_SYMBOL(napi_get_frags);
Herbert Xu96e93ea2009-01-06 10:49:34 -08003022
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07003023gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3024 gro_result_t ret)
Herbert Xu5d0d9be2009-01-29 14:19:48 +00003025{
Herbert Xu5d0d9be2009-01-29 14:19:48 +00003026 switch (ret) {
3027 case GRO_NORMAL:
Herbert Xu86911732009-01-29 14:19:50 +00003028 case GRO_HELD:
Ajit Khapardee76b69c2010-02-16 20:25:43 +00003029 skb->protocol = eth_type_trans(skb, skb->dev);
Herbert Xu86911732009-01-29 14:19:50 +00003030
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07003031 if (ret == GRO_HELD)
3032 skb_gro_pull(skb, -ETH_HLEN);
3033 else if (netif_receive_skb(skb))
3034 ret = GRO_DROP;
Herbert Xu86911732009-01-29 14:19:50 +00003035 break;
Herbert Xu5d0d9be2009-01-29 14:19:48 +00003036
3037 case GRO_DROP:
Herbert Xu5d0d9be2009-01-29 14:19:48 +00003038 case GRO_MERGED_FREE:
3039 napi_reuse_skb(napi, skb);
3040 break;
Ben Hutchings5b252f02009-10-29 07:17:09 +00003041
3042 case GRO_MERGED:
3043 break;
Herbert Xu5d0d9be2009-01-29 14:19:48 +00003044 }
3045
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07003046 return ret;
Herbert Xu5d0d9be2009-01-29 14:19:48 +00003047}
3048EXPORT_SYMBOL(napi_frags_finish);
3049
Herbert Xu76620aa2009-04-16 02:02:07 -07003050struct sk_buff *napi_frags_skb(struct napi_struct *napi)
Herbert Xu96e93ea2009-01-06 10:49:34 -08003051{
Herbert Xu76620aa2009-04-16 02:02:07 -07003052 struct sk_buff *skb = napi->skb;
3053 struct ethhdr *eth;
Herbert Xua5b1cf22009-05-26 18:50:28 +00003054 unsigned int hlen;
3055 unsigned int off;
Herbert Xu76620aa2009-04-16 02:02:07 -07003056
3057 napi->skb = NULL;
3058
3059 skb_reset_mac_header(skb);
3060 skb_gro_reset_offset(skb);
3061
Herbert Xua5b1cf22009-05-26 18:50:28 +00003062 off = skb_gro_offset(skb);
3063 hlen = off + sizeof(*eth);
3064 eth = skb_gro_header_fast(skb, off);
3065 if (skb_gro_header_hard(skb, hlen)) {
3066 eth = skb_gro_header_slow(skb, hlen, off);
3067 if (unlikely(!eth)) {
3068 napi_reuse_skb(napi, skb);
3069 skb = NULL;
3070 goto out;
3071 }
Herbert Xu76620aa2009-04-16 02:02:07 -07003072 }
3073
3074 skb_gro_pull(skb, sizeof(*eth));
3075
3076 /*
3077 * This works because the only protocols we care about don't require
3078 * special handling. We'll fix it up properly at the end.
3079 */
3080 skb->protocol = eth->h_proto;
3081
3082out:
3083 return skb;
3084}
3085EXPORT_SYMBOL(napi_frags_skb);
3086
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07003087gro_result_t napi_gro_frags(struct napi_struct *napi)
Herbert Xu76620aa2009-04-16 02:02:07 -07003088{
3089 struct sk_buff *skb = napi_frags_skb(napi);
Herbert Xu96e93ea2009-01-06 10:49:34 -08003090
3091 if (!skb)
Ben Hutchingsc7c4b3b2009-10-29 21:36:53 -07003092 return GRO_DROP;
Herbert Xu96e93ea2009-01-06 10:49:34 -08003093
Herbert Xu5d0d9be2009-01-29 14:19:48 +00003094 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
Herbert Xu5d38a072009-01-04 16:13:40 -08003095}
3096EXPORT_SYMBOL(napi_gro_frags);
3097
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003098static int process_backlog(struct napi_struct *napi, int quota)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003099{
3100 int work = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003101 struct softnet_data *queue = &__get_cpu_var(softnet_data);
3102 unsigned long start_time = jiffies;
3103
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003104 napi->weight = weight_p;
3105 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003106 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003107
Changli Gao152102c2010-03-30 20:16:22 +00003108 local_irq_disable();
3109 rps_lock(queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003110 skb = __skb_dequeue(&queue->input_pkt_queue);
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003111 if (!skb) {
Herbert Xu8f1ead22009-03-26 00:59:10 -07003112 __napi_complete(napi);
Tom Herbert0a9627f2010-03-16 08:03:29 +00003113 spin_unlock_irq(&queue->input_pkt_queue.lock);
Herbert Xu8f1ead22009-03-26 00:59:10 -07003114 break;
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003115 }
Changli Gao152102c2010-03-30 20:16:22 +00003116 rps_unlock(queue);
3117 local_irq_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003118
Tom Herbert0a9627f2010-03-16 08:03:29 +00003119 __netif_receive_skb(skb);
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003120 } while (++work < quota && jiffies == start_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003121
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003122 return work;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123}
3124
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003125/**
3126 * __napi_schedule - schedule for receive
Randy Dunlapc4ea43c2007-10-12 21:17:49 -07003127 * @n: entry to schedule
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003128 *
3129 * The entry's receive function will be scheduled to run
3130 */
Harvey Harrisonb5606c22008-02-13 15:03:16 -08003131void __napi_schedule(struct napi_struct *n)
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003132{
3133 unsigned long flags;
3134
3135 local_irq_save(flags);
3136 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
3137 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3138 local_irq_restore(flags);
3139}
3140EXPORT_SYMBOL(__napi_schedule);
3141
Herbert Xud565b0a2008-12-15 23:38:52 -08003142void __napi_complete(struct napi_struct *n)
3143{
3144 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3145 BUG_ON(n->gro_list);
3146
3147 list_del(&n->poll_list);
3148 smp_mb__before_clear_bit();
3149 clear_bit(NAPI_STATE_SCHED, &n->state);
3150}
3151EXPORT_SYMBOL(__napi_complete);
3152
3153void napi_complete(struct napi_struct *n)
3154{
3155 unsigned long flags;
3156
3157 /*
3158 * don't let napi dequeue from the cpu poll list
3159 * just in case its running on a different cpu
3160 */
3161 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3162 return;
3163
3164 napi_gro_flush(n);
3165 local_irq_save(flags);
3166 __napi_complete(n);
3167 local_irq_restore(flags);
3168}
3169EXPORT_SYMBOL(napi_complete);
3170
3171void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3172 int (*poll)(struct napi_struct *, int), int weight)
3173{
3174 INIT_LIST_HEAD(&napi->poll_list);
Herbert Xu4ae55442009-02-08 18:00:36 +00003175 napi->gro_count = 0;
Herbert Xud565b0a2008-12-15 23:38:52 -08003176 napi->gro_list = NULL;
Herbert Xu5d38a072009-01-04 16:13:40 -08003177 napi->skb = NULL;
Herbert Xud565b0a2008-12-15 23:38:52 -08003178 napi->poll = poll;
3179 napi->weight = weight;
3180 list_add(&napi->dev_list, &dev->napi_list);
Herbert Xud565b0a2008-12-15 23:38:52 -08003181 napi->dev = dev;
Herbert Xu5d38a072009-01-04 16:13:40 -08003182#ifdef CONFIG_NETPOLL
Herbert Xud565b0a2008-12-15 23:38:52 -08003183 spin_lock_init(&napi->poll_lock);
3184 napi->poll_owner = -1;
3185#endif
3186 set_bit(NAPI_STATE_SCHED, &napi->state);
3187}
3188EXPORT_SYMBOL(netif_napi_add);
3189
3190void netif_napi_del(struct napi_struct *napi)
3191{
3192 struct sk_buff *skb, *next;
3193
Peter P Waskiewicz Jrd7b06632008-12-26 01:35:35 -08003194 list_del_init(&napi->dev_list);
Herbert Xu76620aa2009-04-16 02:02:07 -07003195 napi_free_frags(napi);
Herbert Xud565b0a2008-12-15 23:38:52 -08003196
3197 for (skb = napi->gro_list; skb; skb = next) {
3198 next = skb->next;
3199 skb->next = NULL;
3200 kfree_skb(skb);
3201 }
3202
3203 napi->gro_list = NULL;
Herbert Xu4ae55442009-02-08 18:00:36 +00003204 napi->gro_count = 0;
Herbert Xud565b0a2008-12-15 23:38:52 -08003205}
3206EXPORT_SYMBOL(netif_napi_del);
3207
Eric Dumazetdf334542010-03-24 19:13:54 +00003208#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00003209/*
3210 * net_rps_action sends any pending IPI's for rps. This is only called from
3211 * softirq and interrupts must be enabled.
3212 */
3213static void net_rps_action(cpumask_t *mask)
3214{
3215 int cpu;
3216
3217 /* Send pending IPI's to kick RPS processing on remote cpus. */
3218 for_each_cpu_mask_nr(cpu, *mask) {
3219 struct softnet_data *queue = &per_cpu(softnet_data, cpu);
3220 if (cpu_online(cpu))
3221 __smp_call_function_single(cpu, &queue->csd, 0);
3222 }
3223 cpus_clear(*mask);
3224}
Tom Herbert1e94d722010-03-18 17:45:44 -07003225#endif
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003226
Linus Torvalds1da177e2005-04-16 15:20:36 -07003227static void net_rx_action(struct softirq_action *h)
3228{
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003229 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
Stephen Hemminger24f8b232008-11-03 17:14:38 -08003230 unsigned long time_limit = jiffies + 2;
Stephen Hemminger51b0bde2005-06-23 20:14:40 -07003231 int budget = netdev_budget;
Matt Mackall53fb95d2005-08-11 19:27:43 -07003232 void *have;
Eric Dumazetdf334542010-03-24 19:13:54 +00003233#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00003234 int select;
3235 struct rps_remote_softirq_cpus *rcpus;
Tom Herbert1e94d722010-03-18 17:45:44 -07003236#endif
Matt Mackall53fb95d2005-08-11 19:27:43 -07003237
Linus Torvalds1da177e2005-04-16 15:20:36 -07003238 local_irq_disable();
3239
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003240 while (!list_empty(list)) {
3241 struct napi_struct *n;
3242 int work, weight;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003243
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003244 /* If softirq window is exhuasted then punt.
Stephen Hemminger24f8b232008-11-03 17:14:38 -08003245 * Allow this to run for 2 jiffies since which will allow
3246 * an average latency of 1.5/HZ.
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003247 */
Stephen Hemminger24f8b232008-11-03 17:14:38 -08003248 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249 goto softnet_break;
3250
3251 local_irq_enable();
3252
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003253 /* Even though interrupts have been re-enabled, this
3254 * access is safe because interrupts can only add new
3255 * entries to the tail of this list, and only ->poll()
3256 * calls can remove this head entry from the list.
3257 */
stephen hemmingere5e26d72010-02-24 14:01:38 +00003258 n = list_first_entry(list, struct napi_struct, poll_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003259
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003260 have = netpoll_poll_lock(n);
3261
3262 weight = n->weight;
3263
David S. Miller0a7606c2007-10-29 21:28:47 -07003264 /* This NAPI_STATE_SCHED test is for avoiding a race
3265 * with netpoll's poll_napi(). Only the entity which
3266 * obtains the lock and sees NAPI_STATE_SCHED set will
3267 * actually make the ->poll() call. Therefore we avoid
3268 * accidently calling ->poll() when NAPI is not scheduled.
3269 */
3270 work = 0;
Neil Horman4ea7e382009-05-21 07:36:08 +00003271 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
David S. Miller0a7606c2007-10-29 21:28:47 -07003272 work = n->poll(n, weight);
Neil Horman4ea7e382009-05-21 07:36:08 +00003273 trace_napi_poll(n);
3274 }
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003275
3276 WARN_ON_ONCE(work > weight);
3277
3278 budget -= work;
3279
3280 local_irq_disable();
3281
3282 /* Drivers must not modify the NAPI state if they
3283 * consume the entire weight. In such cases this code
3284 * still "owns" the NAPI instance and therefore can
3285 * move the instance around on the list at-will.
3286 */
David S. Millerfed17f32008-01-07 21:00:40 -08003287 if (unlikely(work == weight)) {
Herbert Xuff780cd2009-06-26 19:27:04 -07003288 if (unlikely(napi_disable_pending(n))) {
3289 local_irq_enable();
3290 napi_complete(n);
3291 local_irq_disable();
3292 } else
David S. Millerfed17f32008-01-07 21:00:40 -08003293 list_move_tail(&n->poll_list, list);
3294 }
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003295
3296 netpoll_poll_unlock(have);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003297 }
3298out:
Eric Dumazetdf334542010-03-24 19:13:54 +00003299#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00003300 rcpus = &__get_cpu_var(rps_remote_softirq_cpus);
3301 select = rcpus->select;
3302 rcpus->select ^= 1;
3303
Shannon Nelson515e06c2007-06-23 23:09:23 -07003304 local_irq_enable();
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003305
Tom Herbert0a9627f2010-03-16 08:03:29 +00003306 net_rps_action(&rcpus->mask[select]);
Tom Herbert1e94d722010-03-18 17:45:44 -07003307#else
3308 local_irq_enable();
3309#endif
Tom Herbert0a9627f2010-03-16 08:03:29 +00003310
Chris Leechdb217332006-06-17 21:24:58 -07003311#ifdef CONFIG_NET_DMA
3312 /*
3313 * There may not be any more sk_buffs coming right now, so push
3314 * any pending DMA copies to hardware
3315 */
Dan Williams2ba05622009-01-06 11:38:14 -07003316 dma_issue_pending_all();
Chris Leechdb217332006-06-17 21:24:58 -07003317#endif
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003318
Linus Torvalds1da177e2005-04-16 15:20:36 -07003319 return;
3320
3321softnet_break:
3322 __get_cpu_var(netdev_rx_stat).time_squeeze++;
3323 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3324 goto out;
3325}
3326
Eric Dumazetd1b19df2009-09-03 01:29:39 -07003327static gifconf_func_t *gifconf_list[NPROTO];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003328
3329/**
3330 * register_gifconf - register a SIOCGIF handler
3331 * @family: Address family
3332 * @gifconf: Function handler
3333 *
3334 * Register protocol dependent address dumping routines. The handler
3335 * that is passed must not be freed or reused until it has been replaced
3336 * by another handler.
3337 */
Eric Dumazetd1b19df2009-09-03 01:29:39 -07003338int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003339{
3340 if (family >= NPROTO)
3341 return -EINVAL;
3342 gifconf_list[family] = gifconf;
3343 return 0;
3344}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07003345EXPORT_SYMBOL(register_gifconf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003346
3347
3348/*
3349 * Map an interface index to its name (SIOCGIFNAME)
3350 */
3351
3352/*
3353 * We need this ioctl for efficient implementation of the
3354 * if_indextoname() function required by the IPv6 API. Without
3355 * it, we would have to search all the interfaces to find a
3356 * match. --pb
3357 */
3358
Eric W. Biederman881d9662007-09-17 11:56:21 -07003359static int dev_ifname(struct net *net, struct ifreq __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003360{
3361 struct net_device *dev;
3362 struct ifreq ifr;
3363
3364 /*
3365 * Fetch the caller's info block.
3366 */
3367
3368 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3369 return -EFAULT;
3370
Eric Dumazetfb699dfd2009-10-19 19:18:49 +00003371 rcu_read_lock();
3372 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003373 if (!dev) {
Eric Dumazetfb699dfd2009-10-19 19:18:49 +00003374 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003375 return -ENODEV;
3376 }
3377
3378 strcpy(ifr.ifr_name, dev->name);
Eric Dumazetfb699dfd2009-10-19 19:18:49 +00003379 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003380
3381 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3382 return -EFAULT;
3383 return 0;
3384}
3385
3386/*
3387 * Perform a SIOCGIFCONF call. This structure will change
3388 * size eventually, and there is nothing I can do about it.
3389 * Thus we will need a 'compatibility mode'.
3390 */
3391
Eric W. Biederman881d9662007-09-17 11:56:21 -07003392static int dev_ifconf(struct net *net, char __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003393{
3394 struct ifconf ifc;
3395 struct net_device *dev;
3396 char __user *pos;
3397 int len;
3398 int total;
3399 int i;
3400
3401 /*
3402 * Fetch the caller's info block.
3403 */
3404
3405 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3406 return -EFAULT;
3407
3408 pos = ifc.ifc_buf;
3409 len = ifc.ifc_len;
3410
3411 /*
3412 * Loop over the interfaces, and write an info block for each.
3413 */
3414
3415 total = 0;
Eric W. Biederman881d9662007-09-17 11:56:21 -07003416 for_each_netdev(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003417 for (i = 0; i < NPROTO; i++) {
3418 if (gifconf_list[i]) {
3419 int done;
3420 if (!pos)
3421 done = gifconf_list[i](dev, NULL, 0);
3422 else
3423 done = gifconf_list[i](dev, pos + total,
3424 len - total);
3425 if (done < 0)
3426 return -EFAULT;
3427 total += done;
3428 }
3429 }
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003431
3432 /*
3433 * All done. Write the updated control block back to the caller.
3434 */
3435 ifc.ifc_len = total;
3436
3437 /*
3438 * Both BSD and Solaris return 0 here, so we do too.
3439 */
3440 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3441}
3442
3443#ifdef CONFIG_PROC_FS
3444/*
3445 * This is invoked by the /proc filesystem handler to display a device
3446 * in detail.
3447 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003448void *dev_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazetc6d14c82009-11-04 05:43:23 -08003449 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003450{
Denis V. Luneve372c412007-11-19 22:31:54 -08003451 struct net *net = seq_file_net(seq);
Pavel Emelianov7562f872007-05-03 15:13:45 -07003452 loff_t off;
3453 struct net_device *dev;
3454
Eric Dumazetc6d14c82009-11-04 05:43:23 -08003455 rcu_read_lock();
Pavel Emelianov7562f872007-05-03 15:13:45 -07003456 if (!*pos)
3457 return SEQ_START_TOKEN;
3458
3459 off = 1;
Eric Dumazetc6d14c82009-11-04 05:43:23 -08003460 for_each_netdev_rcu(net, dev)
Pavel Emelianov7562f872007-05-03 15:13:45 -07003461 if (off++ == *pos)
3462 return dev;
3463
3464 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003465}
3466
3467void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3468{
Eric Dumazetc6d14c82009-11-04 05:43:23 -08003469 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3470 first_net_device(seq_file_net(seq)) :
3471 next_net_device((struct net_device *)v);
3472
Linus Torvalds1da177e2005-04-16 15:20:36 -07003473 ++*pos;
Eric Dumazetc6d14c82009-11-04 05:43:23 -08003474 return rcu_dereference(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003475}
3476
3477void dev_seq_stop(struct seq_file *seq, void *v)
Eric Dumazetc6d14c82009-11-04 05:43:23 -08003478 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003479{
Eric Dumazetc6d14c82009-11-04 05:43:23 -08003480 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003481}
3482
3483static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3484{
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -08003485 const struct net_device_stats *stats = dev_get_stats(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003486
Jesper Dangaard Brouer2d13baf2010-01-05 05:50:52 +00003487 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
Rusty Russell5a1b5892007-04-28 21:04:03 -07003488 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3489 dev->name, stats->rx_bytes, stats->rx_packets,
3490 stats->rx_errors,
3491 stats->rx_dropped + stats->rx_missed_errors,
3492 stats->rx_fifo_errors,
3493 stats->rx_length_errors + stats->rx_over_errors +
3494 stats->rx_crc_errors + stats->rx_frame_errors,
3495 stats->rx_compressed, stats->multicast,
3496 stats->tx_bytes, stats->tx_packets,
3497 stats->tx_errors, stats->tx_dropped,
3498 stats->tx_fifo_errors, stats->collisions,
3499 stats->tx_carrier_errors +
3500 stats->tx_aborted_errors +
3501 stats->tx_window_errors +
3502 stats->tx_heartbeat_errors,
3503 stats->tx_compressed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003504}
3505
3506/*
3507 * Called from the PROCfs module. This now uses the new arbitrary sized
3508 * /proc/net interface to create /proc/net/dev
3509 */
3510static int dev_seq_show(struct seq_file *seq, void *v)
3511{
3512 if (v == SEQ_START_TOKEN)
3513 seq_puts(seq, "Inter-| Receive "
3514 " | Transmit\n"
3515 " face |bytes packets errs drop fifo frame "
3516 "compressed multicast|bytes packets errs "
3517 "drop fifo colls carrier compressed\n");
3518 else
3519 dev_seq_printf_stats(seq, v);
3520 return 0;
3521}
3522
3523static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3524{
3525 struct netif_rx_stats *rc = NULL;
3526
Mike Travis0c0b0ac2008-05-02 16:43:08 -07003527 while (*pos < nr_cpu_ids)
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003528 if (cpu_online(*pos)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003529 rc = &per_cpu(netdev_rx_stat, *pos);
3530 break;
3531 } else
3532 ++*pos;
3533 return rc;
3534}
3535
3536static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3537{
3538 return softnet_get_online(pos);
3539}
3540
3541static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3542{
3543 ++*pos;
3544 return softnet_get_online(pos);
3545}
3546
3547static void softnet_seq_stop(struct seq_file *seq, void *v)
3548{
3549}
3550
3551static int softnet_seq_show(struct seq_file *seq, void *v)
3552{
3553 struct netif_rx_stats *s = v;
3554
Tom Herbert0a9627f2010-03-16 08:03:29 +00003555 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
Stephen Hemminger31aa02c2005-06-23 20:12:48 -07003556 s->total, s->dropped, s->time_squeeze, 0,
Stephen Hemmingerc1ebcdb2005-06-23 20:08:59 -07003557 0, 0, 0, 0, /* was fastroute */
Tom Herbert0a9627f2010-03-16 08:03:29 +00003558 s->cpu_collision, s->received_rps);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003559 return 0;
3560}
3561
Stephen Hemmingerf6908082007-03-12 14:34:29 -07003562static const struct seq_operations dev_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003563 .start = dev_seq_start,
3564 .next = dev_seq_next,
3565 .stop = dev_seq_stop,
3566 .show = dev_seq_show,
3567};
3568
3569static int dev_seq_open(struct inode *inode, struct file *file)
3570{
Denis V. Luneve372c412007-11-19 22:31:54 -08003571 return seq_open_net(inode, file, &dev_seq_ops,
3572 sizeof(struct seq_net_private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003573}
3574
Arjan van de Ven9a321442007-02-12 00:55:35 -08003575static const struct file_operations dev_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003576 .owner = THIS_MODULE,
3577 .open = dev_seq_open,
3578 .read = seq_read,
3579 .llseek = seq_lseek,
Denis V. Luneve372c412007-11-19 22:31:54 -08003580 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003581};
3582
Stephen Hemmingerf6908082007-03-12 14:34:29 -07003583static const struct seq_operations softnet_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003584 .start = softnet_seq_start,
3585 .next = softnet_seq_next,
3586 .stop = softnet_seq_stop,
3587 .show = softnet_seq_show,
3588};
3589
3590static int softnet_seq_open(struct inode *inode, struct file *file)
3591{
3592 return seq_open(file, &softnet_seq_ops);
3593}
3594
Arjan van de Ven9a321442007-02-12 00:55:35 -08003595static const struct file_operations softnet_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596 .owner = THIS_MODULE,
3597 .open = softnet_seq_open,
3598 .read = seq_read,
3599 .llseek = seq_lseek,
3600 .release = seq_release,
3601};
3602
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003603static void *ptype_get_idx(loff_t pos)
3604{
3605 struct packet_type *pt = NULL;
3606 loff_t i = 0;
3607 int t;
3608
3609 list_for_each_entry_rcu(pt, &ptype_all, list) {
3610 if (i == pos)
3611 return pt;
3612 ++i;
3613 }
3614
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +08003615 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003616 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3617 if (i == pos)
3618 return pt;
3619 ++i;
3620 }
3621 }
3622 return NULL;
3623}
3624
3625static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
Stephen Hemminger72348a42008-01-21 02:27:29 -08003626 __acquires(RCU)
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003627{
3628 rcu_read_lock();
3629 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3630}
3631
3632static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3633{
3634 struct packet_type *pt;
3635 struct list_head *nxt;
3636 int hash;
3637
3638 ++*pos;
3639 if (v == SEQ_START_TOKEN)
3640 return ptype_get_idx(0);
3641
3642 pt = v;
3643 nxt = pt->list.next;
3644 if (pt->type == htons(ETH_P_ALL)) {
3645 if (nxt != &ptype_all)
3646 goto found;
3647 hash = 0;
3648 nxt = ptype_base[0].next;
3649 } else
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +08003650 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003651
3652 while (nxt == &ptype_base[hash]) {
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +08003653 if (++hash >= PTYPE_HASH_SIZE)
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003654 return NULL;
3655 nxt = ptype_base[hash].next;
3656 }
3657found:
3658 return list_entry(nxt, struct packet_type, list);
3659}
3660
3661static void ptype_seq_stop(struct seq_file *seq, void *v)
Stephen Hemminger72348a42008-01-21 02:27:29 -08003662 __releases(RCU)
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003663{
3664 rcu_read_unlock();
3665}
3666
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003667static int ptype_seq_show(struct seq_file *seq, void *v)
3668{
3669 struct packet_type *pt = v;
3670
3671 if (v == SEQ_START_TOKEN)
3672 seq_puts(seq, "Type Device Function\n");
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09003673 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003674 if (pt->type == htons(ETH_P_ALL))
3675 seq_puts(seq, "ALL ");
3676 else
3677 seq_printf(seq, "%04x", ntohs(pt->type));
3678
Alexey Dobriyan908cd2d2008-11-16 19:50:35 -08003679 seq_printf(seq, " %-8s %pF\n",
3680 pt->dev ? pt->dev->name : "", pt->func);
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003681 }
3682
3683 return 0;
3684}
3685
3686static const struct seq_operations ptype_seq_ops = {
3687 .start = ptype_seq_start,
3688 .next = ptype_seq_next,
3689 .stop = ptype_seq_stop,
3690 .show = ptype_seq_show,
3691};
3692
3693static int ptype_seq_open(struct inode *inode, struct file *file)
3694{
Pavel Emelyanov2feb27d2008-03-24 14:57:45 -07003695 return seq_open_net(inode, file, &ptype_seq_ops,
3696 sizeof(struct seq_net_private));
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003697}
3698
3699static const struct file_operations ptype_seq_fops = {
3700 .owner = THIS_MODULE,
3701 .open = ptype_seq_open,
3702 .read = seq_read,
3703 .llseek = seq_lseek,
Pavel Emelyanov2feb27d2008-03-24 14:57:45 -07003704 .release = seq_release_net,
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003705};
3706
3707
Pavel Emelyanov46650792007-10-08 20:38:39 -07003708static int __net_init dev_proc_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003709{
3710 int rc = -ENOMEM;
3711
Eric W. Biederman881d9662007-09-17 11:56:21 -07003712 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003713 goto out;
Eric W. Biederman881d9662007-09-17 11:56:21 -07003714 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003715 goto out_dev;
Eric W. Biederman881d9662007-09-17 11:56:21 -07003716 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02003717 goto out_softnet;
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07003718
Eric W. Biederman881d9662007-09-17 11:56:21 -07003719 if (wext_proc_init(net))
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02003720 goto out_ptype;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003721 rc = 0;
3722out:
3723 return rc;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02003724out_ptype:
Eric W. Biederman881d9662007-09-17 11:56:21 -07003725 proc_net_remove(net, "ptype");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003726out_softnet:
Eric W. Biederman881d9662007-09-17 11:56:21 -07003727 proc_net_remove(net, "softnet_stat");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003728out_dev:
Eric W. Biederman881d9662007-09-17 11:56:21 -07003729 proc_net_remove(net, "dev");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003730 goto out;
3731}
Eric W. Biederman881d9662007-09-17 11:56:21 -07003732
Pavel Emelyanov46650792007-10-08 20:38:39 -07003733static void __net_exit dev_proc_net_exit(struct net *net)
Eric W. Biederman881d9662007-09-17 11:56:21 -07003734{
3735 wext_proc_exit(net);
3736
3737 proc_net_remove(net, "ptype");
3738 proc_net_remove(net, "softnet_stat");
3739 proc_net_remove(net, "dev");
3740}
3741
Denis V. Lunev022cbae2007-11-13 03:23:50 -08003742static struct pernet_operations __net_initdata dev_proc_ops = {
Eric W. Biederman881d9662007-09-17 11:56:21 -07003743 .init = dev_proc_net_init,
3744 .exit = dev_proc_net_exit,
3745};
3746
3747static int __init dev_proc_init(void)
3748{
3749 return register_pernet_subsys(&dev_proc_ops);
3750}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003751#else
3752#define dev_proc_init() 0
3753#endif /* CONFIG_PROC_FS */
3754
3755
3756/**
3757 * netdev_set_master - set up master/slave pair
3758 * @slave: slave device
3759 * @master: new master device
3760 *
3761 * Changes the master device of the slave. Pass %NULL to break the
3762 * bonding. The caller must hold the RTNL semaphore. On a failure
3763 * a negative errno code is returned. On success the reference counts
3764 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3765 * function returns zero.
3766 */
3767int netdev_set_master(struct net_device *slave, struct net_device *master)
3768{
3769 struct net_device *old = slave->master;
3770
3771 ASSERT_RTNL();
3772
3773 if (master) {
3774 if (old)
3775 return -EBUSY;
3776 dev_hold(master);
3777 }
3778
3779 slave->master = master;
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003780
Eric Dumazet283f2fe2010-03-18 13:37:40 +00003781 if (old) {
3782 synchronize_net();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003783 dev_put(old);
Eric Dumazet283f2fe2010-03-18 13:37:40 +00003784 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003785 if (master)
3786 slave->flags |= IFF_SLAVE;
3787 else
3788 slave->flags &= ~IFF_SLAVE;
3789
3790 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3791 return 0;
3792}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07003793EXPORT_SYMBOL(netdev_set_master);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003794
Patrick McHardyb6c40d62008-10-07 15:26:48 -07003795static void dev_change_rx_flags(struct net_device *dev, int flags)
3796{
Stephen Hemmingerd3147742008-11-19 21:32:24 -08003797 const struct net_device_ops *ops = dev->netdev_ops;
3798
3799 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3800 ops->ndo_change_rx_flags(dev, flags);
Patrick McHardyb6c40d62008-10-07 15:26:48 -07003801}
3802
Wang Chendad9b332008-06-18 01:48:28 -07003803static int __dev_set_promiscuity(struct net_device *dev, int inc)
Patrick McHardy4417da62007-06-27 01:28:10 -07003804{
3805 unsigned short old_flags = dev->flags;
David Howells8192b0c2008-11-14 10:39:10 +11003806 uid_t uid;
3807 gid_t gid;
Patrick McHardy4417da62007-06-27 01:28:10 -07003808
Patrick McHardy24023452007-07-14 18:51:31 -07003809 ASSERT_RTNL();
3810
Wang Chendad9b332008-06-18 01:48:28 -07003811 dev->flags |= IFF_PROMISC;
3812 dev->promiscuity += inc;
3813 if (dev->promiscuity == 0) {
3814 /*
3815 * Avoid overflow.
3816 * If inc causes overflow, untouch promisc and return error.
3817 */
3818 if (inc < 0)
3819 dev->flags &= ~IFF_PROMISC;
3820 else {
3821 dev->promiscuity -= inc;
3822 printk(KERN_WARNING "%s: promiscuity touches roof, "
3823 "set promiscuity failed, promiscuity feature "
3824 "of device might be broken.\n", dev->name);
3825 return -EOVERFLOW;
3826 }
3827 }
Patrick McHardy4417da62007-06-27 01:28:10 -07003828 if (dev->flags != old_flags) {
3829 printk(KERN_INFO "device %s %s promiscuous mode\n",
3830 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3831 "left");
David Howells8192b0c2008-11-14 10:39:10 +11003832 if (audit_enabled) {
3833 current_uid_gid(&uid, &gid);
Klaus Heinrich Kiwi7759db82008-01-23 22:57:45 -05003834 audit_log(current->audit_context, GFP_ATOMIC,
3835 AUDIT_ANOM_PROMISCUOUS,
3836 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3837 dev->name, (dev->flags & IFF_PROMISC),
3838 (old_flags & IFF_PROMISC),
3839 audit_get_loginuid(current),
David Howells8192b0c2008-11-14 10:39:10 +11003840 uid, gid,
Klaus Heinrich Kiwi7759db82008-01-23 22:57:45 -05003841 audit_get_sessionid(current));
David Howells8192b0c2008-11-14 10:39:10 +11003842 }
Patrick McHardy24023452007-07-14 18:51:31 -07003843
Patrick McHardyb6c40d62008-10-07 15:26:48 -07003844 dev_change_rx_flags(dev, IFF_PROMISC);
Patrick McHardy4417da62007-06-27 01:28:10 -07003845 }
Wang Chendad9b332008-06-18 01:48:28 -07003846 return 0;
Patrick McHardy4417da62007-06-27 01:28:10 -07003847}
3848
Linus Torvalds1da177e2005-04-16 15:20:36 -07003849/**
3850 * dev_set_promiscuity - update promiscuity count on a device
3851 * @dev: device
3852 * @inc: modifier
3853 *
Stephen Hemminger3041a062006-05-26 13:25:24 -07003854 * Add or remove promiscuity from a device. While the count in the device
Linus Torvalds1da177e2005-04-16 15:20:36 -07003855 * remains above zero the interface remains promiscuous. Once it hits zero
3856 * the device reverts back to normal filtering operation. A negative inc
3857 * value is used to drop promiscuity on the device.
Wang Chendad9b332008-06-18 01:48:28 -07003858 * Return 0 if successful or a negative errno code on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003859 */
Wang Chendad9b332008-06-18 01:48:28 -07003860int dev_set_promiscuity(struct net_device *dev, int inc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003861{
3862 unsigned short old_flags = dev->flags;
Wang Chendad9b332008-06-18 01:48:28 -07003863 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003864
Wang Chendad9b332008-06-18 01:48:28 -07003865 err = __dev_set_promiscuity(dev, inc);
Patrick McHardy4b5a6982008-07-06 15:49:08 -07003866 if (err < 0)
Wang Chendad9b332008-06-18 01:48:28 -07003867 return err;
Patrick McHardy4417da62007-06-27 01:28:10 -07003868 if (dev->flags != old_flags)
3869 dev_set_rx_mode(dev);
Wang Chendad9b332008-06-18 01:48:28 -07003870 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003871}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07003872EXPORT_SYMBOL(dev_set_promiscuity);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003873
3874/**
3875 * dev_set_allmulti - update allmulti count on a device
3876 * @dev: device
3877 * @inc: modifier
3878 *
3879 * Add or remove reception of all multicast frames to a device. While the
3880 * count in the device remains above zero the interface remains listening
3881 * to all interfaces. Once it hits zero the device reverts back to normal
3882 * filtering operation. A negative @inc value is used to drop the counter
3883 * when releasing a resource needing all multicasts.
Wang Chendad9b332008-06-18 01:48:28 -07003884 * Return 0 if successful or a negative errno code on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003885 */
3886
Wang Chendad9b332008-06-18 01:48:28 -07003887int dev_set_allmulti(struct net_device *dev, int inc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003888{
3889 unsigned short old_flags = dev->flags;
3890
Patrick McHardy24023452007-07-14 18:51:31 -07003891 ASSERT_RTNL();
3892
Linus Torvalds1da177e2005-04-16 15:20:36 -07003893 dev->flags |= IFF_ALLMULTI;
Wang Chendad9b332008-06-18 01:48:28 -07003894 dev->allmulti += inc;
3895 if (dev->allmulti == 0) {
3896 /*
3897 * Avoid overflow.
3898 * If inc causes overflow, untouch allmulti and return error.
3899 */
3900 if (inc < 0)
3901 dev->flags &= ~IFF_ALLMULTI;
3902 else {
3903 dev->allmulti -= inc;
3904 printk(KERN_WARNING "%s: allmulti touches roof, "
3905 "set allmulti failed, allmulti feature of "
3906 "device might be broken.\n", dev->name);
3907 return -EOVERFLOW;
3908 }
3909 }
Patrick McHardy24023452007-07-14 18:51:31 -07003910 if (dev->flags ^ old_flags) {
Patrick McHardyb6c40d62008-10-07 15:26:48 -07003911 dev_change_rx_flags(dev, IFF_ALLMULTI);
Patrick McHardy4417da62007-06-27 01:28:10 -07003912 dev_set_rx_mode(dev);
Patrick McHardy24023452007-07-14 18:51:31 -07003913 }
Wang Chendad9b332008-06-18 01:48:28 -07003914 return 0;
Patrick McHardy4417da62007-06-27 01:28:10 -07003915}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07003916EXPORT_SYMBOL(dev_set_allmulti);
Patrick McHardy4417da62007-06-27 01:28:10 -07003917
3918/*
3919 * Upload unicast and multicast address lists to device and
3920 * configure RX filtering. When the device doesn't support unicast
Joe Perches53ccaae2007-12-20 14:02:06 -08003921 * filtering it is put in promiscuous mode while unicast addresses
Patrick McHardy4417da62007-06-27 01:28:10 -07003922 * are present.
3923 */
3924void __dev_set_rx_mode(struct net_device *dev)
3925{
Stephen Hemmingerd3147742008-11-19 21:32:24 -08003926 const struct net_device_ops *ops = dev->netdev_ops;
3927
Patrick McHardy4417da62007-06-27 01:28:10 -07003928 /* dev_open will call this function so the list will stay sane. */
3929 if (!(dev->flags&IFF_UP))
3930 return;
3931
3932 if (!netif_device_present(dev))
YOSHIFUJI Hideaki40b77c92007-07-19 10:43:23 +09003933 return;
Patrick McHardy4417da62007-06-27 01:28:10 -07003934
Stephen Hemmingerd3147742008-11-19 21:32:24 -08003935 if (ops->ndo_set_rx_mode)
3936 ops->ndo_set_rx_mode(dev);
Patrick McHardy4417da62007-06-27 01:28:10 -07003937 else {
3938 /* Unicast addresses changes may only happen under the rtnl,
3939 * therefore calling __dev_set_promiscuity here is safe.
3940 */
Jiri Pirko32e7bfc2010-01-25 13:36:10 -08003941 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
Patrick McHardy4417da62007-06-27 01:28:10 -07003942 __dev_set_promiscuity(dev, 1);
3943 dev->uc_promisc = 1;
Jiri Pirko32e7bfc2010-01-25 13:36:10 -08003944 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
Patrick McHardy4417da62007-06-27 01:28:10 -07003945 __dev_set_promiscuity(dev, -1);
3946 dev->uc_promisc = 0;
3947 }
3948
Stephen Hemmingerd3147742008-11-19 21:32:24 -08003949 if (ops->ndo_set_multicast_list)
3950 ops->ndo_set_multicast_list(dev);
Patrick McHardy4417da62007-06-27 01:28:10 -07003951 }
3952}
3953
3954void dev_set_rx_mode(struct net_device *dev)
3955{
David S. Millerb9e40852008-07-15 00:15:08 -07003956 netif_addr_lock_bh(dev);
Patrick McHardy4417da62007-06-27 01:28:10 -07003957 __dev_set_rx_mode(dev);
David S. Millerb9e40852008-07-15 00:15:08 -07003958 netif_addr_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003959}
3960
Jiri Pirkof001fde2009-05-05 02:48:28 +00003961/* hw addresses list handling functions */
3962
Jiri Pirko31278e72009-06-17 01:12:19 +00003963static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr,
3964 int addr_len, unsigned char addr_type)
Jiri Pirkof001fde2009-05-05 02:48:28 +00003965{
3966 struct netdev_hw_addr *ha;
3967 int alloc_size;
3968
3969 if (addr_len > MAX_ADDR_LEN)
3970 return -EINVAL;
3971
Jiri Pirko31278e72009-06-17 01:12:19 +00003972 list_for_each_entry(ha, &list->list, list) {
Jiri Pirkoccffad252009-05-22 23:22:17 +00003973 if (!memcmp(ha->addr, addr, addr_len) &&
3974 ha->type == addr_type) {
3975 ha->refcount++;
3976 return 0;
3977 }
3978 }
3979
3980
Jiri Pirkof001fde2009-05-05 02:48:28 +00003981 alloc_size = sizeof(*ha);
3982 if (alloc_size < L1_CACHE_BYTES)
3983 alloc_size = L1_CACHE_BYTES;
3984 ha = kmalloc(alloc_size, GFP_ATOMIC);
3985 if (!ha)
3986 return -ENOMEM;
3987 memcpy(ha->addr, addr, addr_len);
3988 ha->type = addr_type;
Jiri Pirkoccffad252009-05-22 23:22:17 +00003989 ha->refcount = 1;
3990 ha->synced = false;
Jiri Pirko31278e72009-06-17 01:12:19 +00003991 list_add_tail_rcu(&ha->list, &list->list);
3992 list->count++;
Jiri Pirkof001fde2009-05-05 02:48:28 +00003993 return 0;
3994}
3995
3996static void ha_rcu_free(struct rcu_head *head)
3997{
3998 struct netdev_hw_addr *ha;
3999
4000 ha = container_of(head, struct netdev_hw_addr, rcu_head);
4001 kfree(ha);
4002}
4003
Jiri Pirko31278e72009-06-17 01:12:19 +00004004static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr,
4005 int addr_len, unsigned char addr_type)
Jiri Pirkof001fde2009-05-05 02:48:28 +00004006{
4007 struct netdev_hw_addr *ha;
Jiri Pirkof001fde2009-05-05 02:48:28 +00004008
Jiri Pirko31278e72009-06-17 01:12:19 +00004009 list_for_each_entry(ha, &list->list, list) {
Jiri Pirkoccffad252009-05-22 23:22:17 +00004010 if (!memcmp(ha->addr, addr, addr_len) &&
Jiri Pirkof001fde2009-05-05 02:48:28 +00004011 (ha->type == addr_type || !addr_type)) {
Jiri Pirkoccffad252009-05-22 23:22:17 +00004012 if (--ha->refcount)
4013 return 0;
Jiri Pirkof001fde2009-05-05 02:48:28 +00004014 list_del_rcu(&ha->list);
4015 call_rcu(&ha->rcu_head, ha_rcu_free);
Jiri Pirko31278e72009-06-17 01:12:19 +00004016 list->count--;
Jiri Pirkof001fde2009-05-05 02:48:28 +00004017 return 0;
4018 }
4019 }
4020 return -ENOENT;
4021}
4022
Jiri Pirko31278e72009-06-17 01:12:19 +00004023static int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
4024 struct netdev_hw_addr_list *from_list,
4025 int addr_len,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004026 unsigned char addr_type)
Jiri Pirkof001fde2009-05-05 02:48:28 +00004027{
4028 int err;
4029 struct netdev_hw_addr *ha, *ha2;
4030 unsigned char type;
4031
Jiri Pirko31278e72009-06-17 01:12:19 +00004032 list_for_each_entry(ha, &from_list->list, list) {
Jiri Pirkof001fde2009-05-05 02:48:28 +00004033 type = addr_type ? addr_type : ha->type;
Jiri Pirko31278e72009-06-17 01:12:19 +00004034 err = __hw_addr_add(to_list, ha->addr, addr_len, type);
Jiri Pirkof001fde2009-05-05 02:48:28 +00004035 if (err)
4036 goto unroll;
4037 }
4038 return 0;
4039
4040unroll:
Jiri Pirko31278e72009-06-17 01:12:19 +00004041 list_for_each_entry(ha2, &from_list->list, list) {
Jiri Pirkof001fde2009-05-05 02:48:28 +00004042 if (ha2 == ha)
4043 break;
4044 type = addr_type ? addr_type : ha2->type;
Jiri Pirko31278e72009-06-17 01:12:19 +00004045 __hw_addr_del(to_list, ha2->addr, addr_len, type);
Jiri Pirkof001fde2009-05-05 02:48:28 +00004046 }
4047 return err;
4048}
4049
Jiri Pirko31278e72009-06-17 01:12:19 +00004050static void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
4051 struct netdev_hw_addr_list *from_list,
4052 int addr_len,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004053 unsigned char addr_type)
Jiri Pirkof001fde2009-05-05 02:48:28 +00004054{
4055 struct netdev_hw_addr *ha;
4056 unsigned char type;
4057
Jiri Pirko31278e72009-06-17 01:12:19 +00004058 list_for_each_entry(ha, &from_list->list, list) {
Jiri Pirkof001fde2009-05-05 02:48:28 +00004059 type = addr_type ? addr_type : ha->type;
Jiri Pirko31278e72009-06-17 01:12:19 +00004060 __hw_addr_del(to_list, ha->addr, addr_len, addr_type);
Jiri Pirkof001fde2009-05-05 02:48:28 +00004061 }
4062}
4063
Jiri Pirko31278e72009-06-17 01:12:19 +00004064static int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
4065 struct netdev_hw_addr_list *from_list,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004066 int addr_len)
4067{
4068 int err = 0;
4069 struct netdev_hw_addr *ha, *tmp;
4070
Jiri Pirko31278e72009-06-17 01:12:19 +00004071 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
Jiri Pirkoccffad252009-05-22 23:22:17 +00004072 if (!ha->synced) {
Jiri Pirko31278e72009-06-17 01:12:19 +00004073 err = __hw_addr_add(to_list, ha->addr,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004074 addr_len, ha->type);
4075 if (err)
4076 break;
4077 ha->synced = true;
4078 ha->refcount++;
4079 } else if (ha->refcount == 1) {
Jiri Pirko31278e72009-06-17 01:12:19 +00004080 __hw_addr_del(to_list, ha->addr, addr_len, ha->type);
4081 __hw_addr_del(from_list, ha->addr, addr_len, ha->type);
Jiri Pirkoccffad252009-05-22 23:22:17 +00004082 }
4083 }
4084 return err;
4085}
4086
Jiri Pirko31278e72009-06-17 01:12:19 +00004087static void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
4088 struct netdev_hw_addr_list *from_list,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004089 int addr_len)
4090{
4091 struct netdev_hw_addr *ha, *tmp;
4092
Jiri Pirko31278e72009-06-17 01:12:19 +00004093 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
Jiri Pirkoccffad252009-05-22 23:22:17 +00004094 if (ha->synced) {
Jiri Pirko31278e72009-06-17 01:12:19 +00004095 __hw_addr_del(to_list, ha->addr,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004096 addr_len, ha->type);
4097 ha->synced = false;
Jiri Pirko31278e72009-06-17 01:12:19 +00004098 __hw_addr_del(from_list, ha->addr,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004099 addr_len, ha->type);
4100 }
4101 }
4102}
4103
Jiri Pirko31278e72009-06-17 01:12:19 +00004104static void __hw_addr_flush(struct netdev_hw_addr_list *list)
Jiri Pirkof001fde2009-05-05 02:48:28 +00004105{
4106 struct netdev_hw_addr *ha, *tmp;
4107
Jiri Pirko31278e72009-06-17 01:12:19 +00004108 list_for_each_entry_safe(ha, tmp, &list->list, list) {
Jiri Pirkof001fde2009-05-05 02:48:28 +00004109 list_del_rcu(&ha->list);
4110 call_rcu(&ha->rcu_head, ha_rcu_free);
4111 }
Jiri Pirko31278e72009-06-17 01:12:19 +00004112 list->count = 0;
4113}
4114
4115static void __hw_addr_init(struct netdev_hw_addr_list *list)
4116{
4117 INIT_LIST_HEAD(&list->list);
4118 list->count = 0;
Jiri Pirkof001fde2009-05-05 02:48:28 +00004119}
4120
4121/* Device addresses handling functions */
4122
4123static void dev_addr_flush(struct net_device *dev)
4124{
4125 /* rtnl_mutex must be held here */
4126
Jiri Pirko31278e72009-06-17 01:12:19 +00004127 __hw_addr_flush(&dev->dev_addrs);
Jiri Pirkof001fde2009-05-05 02:48:28 +00004128 dev->dev_addr = NULL;
4129}
4130
4131static int dev_addr_init(struct net_device *dev)
4132{
4133 unsigned char addr[MAX_ADDR_LEN];
4134 struct netdev_hw_addr *ha;
4135 int err;
4136
4137 /* rtnl_mutex must be held here */
4138
Jiri Pirko31278e72009-06-17 01:12:19 +00004139 __hw_addr_init(&dev->dev_addrs);
Eric Dumazet0c279222009-06-08 03:49:24 +00004140 memset(addr, 0, sizeof(addr));
Jiri Pirko31278e72009-06-17 01:12:19 +00004141 err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr),
Jiri Pirkof001fde2009-05-05 02:48:28 +00004142 NETDEV_HW_ADDR_T_LAN);
4143 if (!err) {
4144 /*
4145 * Get the first (previously created) address from the list
4146 * and set dev_addr pointer to this location.
4147 */
Jiri Pirko31278e72009-06-17 01:12:19 +00004148 ha = list_first_entry(&dev->dev_addrs.list,
Jiri Pirkof001fde2009-05-05 02:48:28 +00004149 struct netdev_hw_addr, list);
4150 dev->dev_addr = ha->addr;
4151 }
4152 return err;
4153}
4154
4155/**
4156 * dev_addr_add - Add a device address
4157 * @dev: device
4158 * @addr: address to add
4159 * @addr_type: address type
4160 *
4161 * Add a device address to the device or increase the reference count if
4162 * it already exists.
4163 *
4164 * The caller must hold the rtnl_mutex.
4165 */
4166int dev_addr_add(struct net_device *dev, unsigned char *addr,
4167 unsigned char addr_type)
4168{
4169 int err;
4170
4171 ASSERT_RTNL();
4172
Jiri Pirko31278e72009-06-17 01:12:19 +00004173 err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type);
Jiri Pirkof001fde2009-05-05 02:48:28 +00004174 if (!err)
4175 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4176 return err;
4177}
4178EXPORT_SYMBOL(dev_addr_add);
4179
4180/**
4181 * dev_addr_del - Release a device address.
4182 * @dev: device
4183 * @addr: address to delete
4184 * @addr_type: address type
4185 *
4186 * Release reference to a device address and remove it from the device
4187 * if the reference count drops to zero.
4188 *
4189 * The caller must hold the rtnl_mutex.
4190 */
4191int dev_addr_del(struct net_device *dev, unsigned char *addr,
4192 unsigned char addr_type)
4193{
4194 int err;
Jiri Pirkoccffad252009-05-22 23:22:17 +00004195 struct netdev_hw_addr *ha;
Jiri Pirkof001fde2009-05-05 02:48:28 +00004196
4197 ASSERT_RTNL();
4198
Jiri Pirkoccffad252009-05-22 23:22:17 +00004199 /*
4200 * We can not remove the first address from the list because
4201 * dev->dev_addr points to that.
4202 */
Jiri Pirko31278e72009-06-17 01:12:19 +00004203 ha = list_first_entry(&dev->dev_addrs.list,
4204 struct netdev_hw_addr, list);
Jiri Pirkoccffad252009-05-22 23:22:17 +00004205 if (ha->addr == dev->dev_addr && ha->refcount == 1)
4206 return -ENOENT;
4207
Jiri Pirko31278e72009-06-17 01:12:19 +00004208 err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004209 addr_type);
Jiri Pirkof001fde2009-05-05 02:48:28 +00004210 if (!err)
4211 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4212 return err;
4213}
4214EXPORT_SYMBOL(dev_addr_del);
4215
4216/**
4217 * dev_addr_add_multiple - Add device addresses from another device
4218 * @to_dev: device to which addresses will be added
4219 * @from_dev: device from which addresses will be added
4220 * @addr_type: address type - 0 means type will be used from from_dev
4221 *
4222 * Add device addresses of the one device to another.
4223 **
4224 * The caller must hold the rtnl_mutex.
4225 */
4226int dev_addr_add_multiple(struct net_device *to_dev,
4227 struct net_device *from_dev,
4228 unsigned char addr_type)
4229{
4230 int err;
4231
4232 ASSERT_RTNL();
4233
4234 if (from_dev->addr_len != to_dev->addr_len)
4235 return -EINVAL;
Jiri Pirko31278e72009-06-17 01:12:19 +00004236 err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004237 to_dev->addr_len, addr_type);
Jiri Pirkof001fde2009-05-05 02:48:28 +00004238 if (!err)
4239 call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
4240 return err;
4241}
4242EXPORT_SYMBOL(dev_addr_add_multiple);
4243
4244/**
4245 * dev_addr_del_multiple - Delete device addresses by another device
4246 * @to_dev: device where the addresses will be deleted
4247 * @from_dev: device by which addresses the addresses will be deleted
4248 * @addr_type: address type - 0 means type will used from from_dev
4249 *
4250 * Deletes addresses in to device by the list of addresses in from device.
4251 *
4252 * The caller must hold the rtnl_mutex.
4253 */
4254int dev_addr_del_multiple(struct net_device *to_dev,
4255 struct net_device *from_dev,
4256 unsigned char addr_type)
4257{
4258 ASSERT_RTNL();
4259
4260 if (from_dev->addr_len != to_dev->addr_len)
4261 return -EINVAL;
Jiri Pirko31278e72009-06-17 01:12:19 +00004262 __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
Jiri Pirkoccffad252009-05-22 23:22:17 +00004263 to_dev->addr_len, addr_type);
Jiri Pirkof001fde2009-05-05 02:48:28 +00004264 call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
4265 return 0;
4266}
4267EXPORT_SYMBOL(dev_addr_del_multiple);
4268
Jiri Pirko31278e72009-06-17 01:12:19 +00004269/* multicast addresses handling functions */
Jiri Pirkof001fde2009-05-05 02:48:28 +00004270
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07004271int __dev_addr_delete(struct dev_addr_list **list, int *count,
4272 void *addr, int alen, int glbl)
Patrick McHardybf742482007-06-27 01:26:19 -07004273{
4274 struct dev_addr_list *da;
4275
4276 for (; (da = *list) != NULL; list = &da->next) {
4277 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
4278 alen == da->da_addrlen) {
4279 if (glbl) {
4280 int old_glbl = da->da_gusers;
4281 da->da_gusers = 0;
4282 if (old_glbl == 0)
4283 break;
4284 }
4285 if (--da->da_users)
4286 return 0;
4287
4288 *list = da->next;
4289 kfree(da);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07004290 (*count)--;
Patrick McHardybf742482007-06-27 01:26:19 -07004291 return 0;
4292 }
4293 }
4294 return -ENOENT;
4295}
4296
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07004297int __dev_addr_add(struct dev_addr_list **list, int *count,
4298 void *addr, int alen, int glbl)
Patrick McHardybf742482007-06-27 01:26:19 -07004299{
4300 struct dev_addr_list *da;
4301
4302 for (da = *list; da != NULL; da = da->next) {
4303 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
4304 da->da_addrlen == alen) {
4305 if (glbl) {
4306 int old_glbl = da->da_gusers;
4307 da->da_gusers = 1;
4308 if (old_glbl)
4309 return 0;
4310 }
4311 da->da_users++;
4312 return 0;
4313 }
4314 }
4315
Jorge Boncompte [DTI2]12aa3432008-02-19 14:17:04 -08004316 da = kzalloc(sizeof(*da), GFP_ATOMIC);
Patrick McHardybf742482007-06-27 01:26:19 -07004317 if (da == NULL)
4318 return -ENOMEM;
4319 memcpy(da->da_addr, addr, alen);
4320 da->da_addrlen = alen;
4321 da->da_users = 1;
4322 da->da_gusers = glbl ? 1 : 0;
4323 da->next = *list;
4324 *list = da;
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07004325 (*count)++;
Patrick McHardybf742482007-06-27 01:26:19 -07004326 return 0;
4327}
4328
Patrick McHardy4417da62007-06-27 01:28:10 -07004329/**
4330 * dev_unicast_delete - Release secondary unicast address.
4331 * @dev: device
Randy Dunlap0ed72ec2007-07-26 00:03:29 -07004332 * @addr: address to delete
Patrick McHardy4417da62007-06-27 01:28:10 -07004333 *
4334 * Release reference to a secondary unicast address and remove it
Randy Dunlap0ed72ec2007-07-26 00:03:29 -07004335 * from the device if the reference count drops to zero.
Patrick McHardy4417da62007-06-27 01:28:10 -07004336 *
4337 * The caller must hold the rtnl_mutex.
4338 */
Jiri Pirkoccffad252009-05-22 23:22:17 +00004339int dev_unicast_delete(struct net_device *dev, void *addr)
Patrick McHardy4417da62007-06-27 01:28:10 -07004340{
4341 int err;
4342
4343 ASSERT_RTNL();
4344
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004345 netif_addr_lock_bh(dev);
Jiri Pirko31278e72009-06-17 01:12:19 +00004346 err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
4347 NETDEV_HW_ADDR_T_UNICAST);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07004348 if (!err)
Patrick McHardy4417da62007-06-27 01:28:10 -07004349 __dev_set_rx_mode(dev);
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004350 netif_addr_unlock_bh(dev);
Patrick McHardy4417da62007-06-27 01:28:10 -07004351 return err;
4352}
4353EXPORT_SYMBOL(dev_unicast_delete);
4354
4355/**
4356 * dev_unicast_add - add a secondary unicast address
4357 * @dev: device
Wang Chen5dbaec52008-06-27 19:35:16 -07004358 * @addr: address to add
Patrick McHardy4417da62007-06-27 01:28:10 -07004359 *
4360 * Add a secondary unicast address to the device or increase
4361 * the reference count if it already exists.
4362 *
4363 * The caller must hold the rtnl_mutex.
4364 */
Jiri Pirkoccffad252009-05-22 23:22:17 +00004365int dev_unicast_add(struct net_device *dev, void *addr)
Patrick McHardy4417da62007-06-27 01:28:10 -07004366{
4367 int err;
4368
4369 ASSERT_RTNL();
4370
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004371 netif_addr_lock_bh(dev);
Jiri Pirko31278e72009-06-17 01:12:19 +00004372 err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
4373 NETDEV_HW_ADDR_T_UNICAST);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07004374 if (!err)
Patrick McHardy4417da62007-06-27 01:28:10 -07004375 __dev_set_rx_mode(dev);
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004376 netif_addr_unlock_bh(dev);
Patrick McHardy4417da62007-06-27 01:28:10 -07004377 return err;
4378}
4379EXPORT_SYMBOL(dev_unicast_add);
4380
Chris Leeche83a2ea2008-01-31 16:53:23 -08004381int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
4382 struct dev_addr_list **from, int *from_count)
4383{
4384 struct dev_addr_list *da, *next;
4385 int err = 0;
4386
4387 da = *from;
4388 while (da != NULL) {
4389 next = da->next;
4390 if (!da->da_synced) {
4391 err = __dev_addr_add(to, to_count,
4392 da->da_addr, da->da_addrlen, 0);
4393 if (err < 0)
4394 break;
4395 da->da_synced = 1;
4396 da->da_users++;
4397 } else if (da->da_users == 1) {
4398 __dev_addr_delete(to, to_count,
4399 da->da_addr, da->da_addrlen, 0);
4400 __dev_addr_delete(from, from_count,
4401 da->da_addr, da->da_addrlen, 0);
4402 }
4403 da = next;
4404 }
4405 return err;
4406}
Johannes Bergc4029082009-06-17 17:43:30 +02004407EXPORT_SYMBOL_GPL(__dev_addr_sync);
Chris Leeche83a2ea2008-01-31 16:53:23 -08004408
4409void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
4410 struct dev_addr_list **from, int *from_count)
4411{
4412 struct dev_addr_list *da, *next;
4413
4414 da = *from;
4415 while (da != NULL) {
4416 next = da->next;
4417 if (da->da_synced) {
4418 __dev_addr_delete(to, to_count,
4419 da->da_addr, da->da_addrlen, 0);
4420 da->da_synced = 0;
4421 __dev_addr_delete(from, from_count,
4422 da->da_addr, da->da_addrlen, 0);
4423 }
4424 da = next;
4425 }
4426}
Johannes Bergc4029082009-06-17 17:43:30 +02004427EXPORT_SYMBOL_GPL(__dev_addr_unsync);
Chris Leeche83a2ea2008-01-31 16:53:23 -08004428
4429/**
4430 * dev_unicast_sync - Synchronize device's unicast list to another device
4431 * @to: destination device
4432 * @from: source device
4433 *
4434 * Add newly added addresses to the destination device and release
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004435 * addresses that have no users left. The source device must be
4436 * locked by netif_tx_lock_bh.
Chris Leeche83a2ea2008-01-31 16:53:23 -08004437 *
4438 * This function is intended to be called from the dev->set_rx_mode
4439 * function of layered software devices.
4440 */
4441int dev_unicast_sync(struct net_device *to, struct net_device *from)
4442{
4443 int err = 0;
4444
Jiri Pirkoccffad252009-05-22 23:22:17 +00004445 if (to->addr_len != from->addr_len)
4446 return -EINVAL;
4447
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004448 netif_addr_lock_bh(to);
Jiri Pirko31278e72009-06-17 01:12:19 +00004449 err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
Chris Leeche83a2ea2008-01-31 16:53:23 -08004450 if (!err)
4451 __dev_set_rx_mode(to);
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004452 netif_addr_unlock_bh(to);
Chris Leeche83a2ea2008-01-31 16:53:23 -08004453 return err;
4454}
4455EXPORT_SYMBOL(dev_unicast_sync);
4456
4457/**
Randy Dunlapbc2cda12008-02-13 15:03:25 -08004458 * dev_unicast_unsync - Remove synchronized addresses from the destination device
Chris Leeche83a2ea2008-01-31 16:53:23 -08004459 * @to: destination device
4460 * @from: source device
4461 *
4462 * Remove all addresses that were added to the destination device by
4463 * dev_unicast_sync(). This function is intended to be called from the
4464 * dev->stop function of layered software devices.
4465 */
4466void dev_unicast_unsync(struct net_device *to, struct net_device *from)
4467{
Jiri Pirkoccffad252009-05-22 23:22:17 +00004468 if (to->addr_len != from->addr_len)
4469 return;
4470
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004471 netif_addr_lock_bh(from);
4472 netif_addr_lock(to);
Jiri Pirko31278e72009-06-17 01:12:19 +00004473 __hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
Chris Leeche83a2ea2008-01-31 16:53:23 -08004474 __dev_set_rx_mode(to);
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004475 netif_addr_unlock(to);
4476 netif_addr_unlock_bh(from);
Chris Leeche83a2ea2008-01-31 16:53:23 -08004477}
4478EXPORT_SYMBOL(dev_unicast_unsync);
4479
Jiri Pirko32a806c2010-03-19 04:00:23 +00004480void dev_unicast_flush(struct net_device *dev)
Jiri Pirkoccffad252009-05-22 23:22:17 +00004481{
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004482 netif_addr_lock_bh(dev);
Jiri Pirko31278e72009-06-17 01:12:19 +00004483 __hw_addr_flush(&dev->uc);
Jiri Pirkoa6ac65d2009-07-30 01:06:12 +00004484 netif_addr_unlock_bh(dev);
Jiri Pirkoccffad252009-05-22 23:22:17 +00004485}
Jiri Pirko32a806c2010-03-19 04:00:23 +00004486EXPORT_SYMBOL(dev_unicast_flush);
Jiri Pirkoccffad252009-05-22 23:22:17 +00004487
4488static void dev_unicast_init(struct net_device *dev)
4489{
Jiri Pirko31278e72009-06-17 01:12:19 +00004490 __hw_addr_init(&dev->uc);
Jiri Pirkoccffad252009-05-22 23:22:17 +00004491}
4492
4493
Denis Cheng12972622007-07-18 02:12:56 -07004494static void __dev_addr_discard(struct dev_addr_list **list)
4495{
4496 struct dev_addr_list *tmp;
4497
4498 while (*list != NULL) {
4499 tmp = *list;
4500 *list = tmp->next;
4501 if (tmp->da_users > tmp->da_gusers)
4502 printk("__dev_addr_discard: address leakage! "
4503 "da_users=%d\n", tmp->da_users);
4504 kfree(tmp);
4505 }
4506}
4507
Jiri Pirko32a806c2010-03-19 04:00:23 +00004508void dev_addr_discard(struct net_device *dev)
Patrick McHardy4417da62007-06-27 01:28:10 -07004509{
David S. Millerb9e40852008-07-15 00:15:08 -07004510 netif_addr_lock_bh(dev);
Denis Cheng26cc2522007-07-18 02:12:03 -07004511
Denis Cheng456ad752007-07-18 02:10:54 -07004512 __dev_addr_discard(&dev->mc_list);
Jiri Pirko4cd24ea2010-02-08 04:30:35 +00004513 netdev_mc_count(dev) = 0;
Denis Cheng26cc2522007-07-18 02:12:03 -07004514
David S. Millerb9e40852008-07-15 00:15:08 -07004515 netif_addr_unlock_bh(dev);
Denis Cheng456ad752007-07-18 02:10:54 -07004516}
Jiri Pirko32a806c2010-03-19 04:00:23 +00004517EXPORT_SYMBOL(dev_addr_discard);
Denis Cheng456ad752007-07-18 02:10:54 -07004518
Stephen Hemmingerf0db2752008-09-30 02:23:58 -07004519/**
4520 * dev_get_flags - get flags reported to userspace
4521 * @dev: device
4522 *
4523 * Get the combination of flag bits exported through APIs to userspace.
4524 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004525unsigned dev_get_flags(const struct net_device *dev)
4526{
4527 unsigned flags;
4528
4529 flags = (dev->flags & ~(IFF_PROMISC |
4530 IFF_ALLMULTI |
Stefan Rompfb00055a2006-03-20 17:09:11 -08004531 IFF_RUNNING |
4532 IFF_LOWER_UP |
4533 IFF_DORMANT)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -07004534 (dev->gflags & (IFF_PROMISC |
4535 IFF_ALLMULTI));
4536
Stefan Rompfb00055a2006-03-20 17:09:11 -08004537 if (netif_running(dev)) {
4538 if (netif_oper_up(dev))
4539 flags |= IFF_RUNNING;
4540 if (netif_carrier_ok(dev))
4541 flags |= IFF_LOWER_UP;
4542 if (netif_dormant(dev))
4543 flags |= IFF_DORMANT;
4544 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004545
4546 return flags;
4547}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004548EXPORT_SYMBOL(dev_get_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004549
Patrick McHardybd380812010-02-26 06:34:53 +00004550int __dev_change_flags(struct net_device *dev, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004551{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004552 int old_flags = dev->flags;
Patrick McHardybd380812010-02-26 06:34:53 +00004553 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004554
Patrick McHardy24023452007-07-14 18:51:31 -07004555 ASSERT_RTNL();
4556
Linus Torvalds1da177e2005-04-16 15:20:36 -07004557 /*
4558 * Set the flags on our device.
4559 */
4560
4561 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4562 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4563 IFF_AUTOMEDIA)) |
4564 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4565 IFF_ALLMULTI));
4566
4567 /*
4568 * Load in the correct multicast list now the flags have changed.
4569 */
4570
Patrick McHardyb6c40d62008-10-07 15:26:48 -07004571 if ((old_flags ^ flags) & IFF_MULTICAST)
4572 dev_change_rx_flags(dev, IFF_MULTICAST);
Patrick McHardy24023452007-07-14 18:51:31 -07004573
Patrick McHardy4417da62007-06-27 01:28:10 -07004574 dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004575
4576 /*
4577 * Have we downed the interface. We handle IFF_UP ourselves
4578 * according to user attempts to set it, rather than blindly
4579 * setting it.
4580 */
4581
4582 ret = 0;
4583 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
Patrick McHardybd380812010-02-26 06:34:53 +00004584 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004585
4586 if (!ret)
Patrick McHardy4417da62007-06-27 01:28:10 -07004587 dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004588 }
4589
Linus Torvalds1da177e2005-04-16 15:20:36 -07004590 if ((flags ^ dev->gflags) & IFF_PROMISC) {
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004591 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4592
Linus Torvalds1da177e2005-04-16 15:20:36 -07004593 dev->gflags ^= IFF_PROMISC;
4594 dev_set_promiscuity(dev, inc);
4595 }
4596
4597 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4598 is important. Some (broken) drivers set IFF_PROMISC, when
4599 IFF_ALLMULTI is requested not asking us and not reporting.
4600 */
4601 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004602 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4603
Linus Torvalds1da177e2005-04-16 15:20:36 -07004604 dev->gflags ^= IFF_ALLMULTI;
4605 dev_set_allmulti(dev, inc);
4606 }
4607
Patrick McHardybd380812010-02-26 06:34:53 +00004608 return ret;
4609}
4610
4611void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4612{
4613 unsigned int changes = dev->flags ^ old_flags;
4614
4615 if (changes & IFF_UP) {
4616 if (dev->flags & IFF_UP)
4617 call_netdevice_notifiers(NETDEV_UP, dev);
4618 else
4619 call_netdevice_notifiers(NETDEV_DOWN, dev);
4620 }
4621
4622 if (dev->flags & IFF_UP &&
4623 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4624 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4625}
4626
4627/**
4628 * dev_change_flags - change device settings
4629 * @dev: device
4630 * @flags: device state flags
4631 *
4632 * Change settings on device based state flags. The flags are
4633 * in the userspace exported format.
4634 */
4635int dev_change_flags(struct net_device *dev, unsigned flags)
4636{
4637 int ret, changes;
4638 int old_flags = dev->flags;
4639
4640 ret = __dev_change_flags(dev, flags);
4641 if (ret < 0)
4642 return ret;
4643
4644 changes = old_flags ^ dev->flags;
Thomas Graf7c355f52007-06-05 16:03:03 -07004645 if (changes)
4646 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004647
Patrick McHardybd380812010-02-26 06:34:53 +00004648 __dev_notify_flags(dev, old_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004649 return ret;
4650}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004651EXPORT_SYMBOL(dev_change_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004652
Stephen Hemmingerf0db2752008-09-30 02:23:58 -07004653/**
4654 * dev_set_mtu - Change maximum transfer unit
4655 * @dev: device
4656 * @new_mtu: new transfer unit
4657 *
4658 * Change the maximum transfer size of the network device.
4659 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004660int dev_set_mtu(struct net_device *dev, int new_mtu)
4661{
Stephen Hemmingerd3147742008-11-19 21:32:24 -08004662 const struct net_device_ops *ops = dev->netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004663 int err;
4664
4665 if (new_mtu == dev->mtu)
4666 return 0;
4667
4668 /* MTU must be positive. */
4669 if (new_mtu < 0)
4670 return -EINVAL;
4671
4672 if (!netif_device_present(dev))
4673 return -ENODEV;
4674
4675 err = 0;
Stephen Hemmingerd3147742008-11-19 21:32:24 -08004676 if (ops->ndo_change_mtu)
4677 err = ops->ndo_change_mtu(dev, new_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004678 else
4679 dev->mtu = new_mtu;
Stephen Hemmingerd3147742008-11-19 21:32:24 -08004680
Linus Torvalds1da177e2005-04-16 15:20:36 -07004681 if (!err && dev->flags & IFF_UP)
Pavel Emelyanov056925a2007-09-16 15:42:43 -07004682 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004683 return err;
4684}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004685EXPORT_SYMBOL(dev_set_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004686
Stephen Hemmingerf0db2752008-09-30 02:23:58 -07004687/**
4688 * dev_set_mac_address - Change Media Access Control Address
4689 * @dev: device
4690 * @sa: new address
4691 *
4692 * Change the hardware (MAC) address of the device
4693 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004694int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4695{
Stephen Hemmingerd3147742008-11-19 21:32:24 -08004696 const struct net_device_ops *ops = dev->netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004697 int err;
4698
Stephen Hemmingerd3147742008-11-19 21:32:24 -08004699 if (!ops->ndo_set_mac_address)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004700 return -EOPNOTSUPP;
4701 if (sa->sa_family != dev->type)
4702 return -EINVAL;
4703 if (!netif_device_present(dev))
4704 return -ENODEV;
Stephen Hemmingerd3147742008-11-19 21:32:24 -08004705 err = ops->ndo_set_mac_address(dev, sa);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004706 if (!err)
Pavel Emelyanov056925a2007-09-16 15:42:43 -07004707 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004708 return err;
4709}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004710EXPORT_SYMBOL(dev_set_mac_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004711
4712/*
Eric Dumazet3710bec2009-11-01 19:42:09 +00004713 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
Linus Torvalds1da177e2005-04-16 15:20:36 -07004714 */
Jeff Garzik14e3e072007-10-08 00:06:32 -07004715static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004716{
4717 int err;
Eric Dumazet3710bec2009-11-01 19:42:09 +00004718 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004719
4720 if (!dev)
4721 return -ENODEV;
4722
4723 switch (cmd) {
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004724 case SIOCGIFFLAGS: /* Get interface flags */
4725 ifr->ifr_flags = (short) dev_get_flags(dev);
4726 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004727
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004728 case SIOCGIFMETRIC: /* Get the metric on the interface
4729 (currently unused) */
4730 ifr->ifr_metric = 0;
4731 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004732
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004733 case SIOCGIFMTU: /* Get the MTU of a device */
4734 ifr->ifr_mtu = dev->mtu;
4735 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004736
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004737 case SIOCGIFHWADDR:
4738 if (!dev->addr_len)
4739 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4740 else
4741 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4742 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4743 ifr->ifr_hwaddr.sa_family = dev->type;
4744 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004745
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004746 case SIOCGIFSLAVE:
4747 err = -EINVAL;
4748 break;
Jeff Garzik14e3e072007-10-08 00:06:32 -07004749
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004750 case SIOCGIFMAP:
4751 ifr->ifr_map.mem_start = dev->mem_start;
4752 ifr->ifr_map.mem_end = dev->mem_end;
4753 ifr->ifr_map.base_addr = dev->base_addr;
4754 ifr->ifr_map.irq = dev->irq;
4755 ifr->ifr_map.dma = dev->dma;
4756 ifr->ifr_map.port = dev->if_port;
4757 return 0;
Jeff Garzik14e3e072007-10-08 00:06:32 -07004758
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004759 case SIOCGIFINDEX:
4760 ifr->ifr_ifindex = dev->ifindex;
4761 return 0;
Jeff Garzik14e3e072007-10-08 00:06:32 -07004762
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004763 case SIOCGIFTXQLEN:
4764 ifr->ifr_qlen = dev->tx_queue_len;
4765 return 0;
Jeff Garzik14e3e072007-10-08 00:06:32 -07004766
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004767 default:
4768 /* dev_ioctl() should ensure this case
4769 * is never reached
4770 */
4771 WARN_ON(1);
4772 err = -EINVAL;
4773 break;
Jeff Garzik14e3e072007-10-08 00:06:32 -07004774
4775 }
4776 return err;
4777}
4778
4779/*
4780 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4781 */
4782static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4783{
4784 int err;
4785 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
Jarek Poplawski5f2f6da2008-12-22 19:35:28 -08004786 const struct net_device_ops *ops;
Jeff Garzik14e3e072007-10-08 00:06:32 -07004787
4788 if (!dev)
4789 return -ENODEV;
4790
Jarek Poplawski5f2f6da2008-12-22 19:35:28 -08004791 ops = dev->netdev_ops;
4792
Jeff Garzik14e3e072007-10-08 00:06:32 -07004793 switch (cmd) {
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004794 case SIOCSIFFLAGS: /* Set interface flags */
4795 return dev_change_flags(dev, ifr->ifr_flags);
Jeff Garzik14e3e072007-10-08 00:06:32 -07004796
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004797 case SIOCSIFMETRIC: /* Set the metric on the interface
4798 (currently unused) */
4799 return -EOPNOTSUPP;
Jeff Garzik14e3e072007-10-08 00:06:32 -07004800
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004801 case SIOCSIFMTU: /* Set the MTU of a device */
4802 return dev_set_mtu(dev, ifr->ifr_mtu);
Jeff Garzik14e3e072007-10-08 00:06:32 -07004803
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004804 case SIOCSIFHWADDR:
4805 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004806
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004807 case SIOCSIFHWBROADCAST:
4808 if (ifr->ifr_hwaddr.sa_family != dev->type)
4809 return -EINVAL;
4810 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4811 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4812 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4813 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004814
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004815 case SIOCSIFMAP:
4816 if (ops->ndo_set_config) {
4817 if (!netif_device_present(dev))
4818 return -ENODEV;
4819 return ops->ndo_set_config(dev, &ifr->ifr_map);
4820 }
4821 return -EOPNOTSUPP;
4822
4823 case SIOCADDMULTI:
4824 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4825 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4826 return -EINVAL;
4827 if (!netif_device_present(dev))
4828 return -ENODEV;
4829 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
4830 dev->addr_len, 1);
4831
4832 case SIOCDELMULTI:
4833 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4834 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4835 return -EINVAL;
4836 if (!netif_device_present(dev))
4837 return -ENODEV;
4838 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
4839 dev->addr_len, 1);
4840
4841 case SIOCSIFTXQLEN:
4842 if (ifr->ifr_qlen < 0)
4843 return -EINVAL;
4844 dev->tx_queue_len = ifr->ifr_qlen;
4845 return 0;
4846
4847 case SIOCSIFNAME:
4848 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4849 return dev_change_name(dev, ifr->ifr_newname);
4850
4851 /*
4852 * Unknown or private ioctl
4853 */
4854 default:
4855 if ((cmd >= SIOCDEVPRIVATE &&
4856 cmd <= SIOCDEVPRIVATE + 15) ||
4857 cmd == SIOCBONDENSLAVE ||
4858 cmd == SIOCBONDRELEASE ||
4859 cmd == SIOCBONDSETHWADDR ||
4860 cmd == SIOCBONDSLAVEINFOQUERY ||
4861 cmd == SIOCBONDINFOQUERY ||
4862 cmd == SIOCBONDCHANGEACTIVE ||
4863 cmd == SIOCGMIIPHY ||
4864 cmd == SIOCGMIIREG ||
4865 cmd == SIOCSMIIREG ||
4866 cmd == SIOCBRADDIF ||
4867 cmd == SIOCBRDELIF ||
4868 cmd == SIOCSHWTSTAMP ||
4869 cmd == SIOCWANDEV) {
4870 err = -EOPNOTSUPP;
4871 if (ops->ndo_do_ioctl) {
4872 if (netif_device_present(dev))
4873 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4874 else
4875 err = -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004876 }
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004877 } else
4878 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004879
4880 }
4881 return err;
4882}
4883
4884/*
4885 * This function handles all "interface"-type I/O control requests. The actual
4886 * 'doing' part of this is dev_ifsioc above.
4887 */
4888
4889/**
4890 * dev_ioctl - network device ioctl
Randy Dunlapc4ea43c2007-10-12 21:17:49 -07004891 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -07004892 * @cmd: command to issue
4893 * @arg: pointer to a struct ifreq in user space
4894 *
4895 * Issue ioctl functions to devices. This is normally called by the
4896 * user space syscall interfaces but can sometimes be useful for
4897 * other purposes. The return value is the return from the syscall if
4898 * positive or a negative errno code on error.
4899 */
4900
Eric W. Biederman881d9662007-09-17 11:56:21 -07004901int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004902{
4903 struct ifreq ifr;
4904 int ret;
4905 char *colon;
4906
4907 /* One special case: SIOCGIFCONF takes ifconf argument
4908 and requires shared lock, because it sleeps writing
4909 to user space.
4910 */
4911
4912 if (cmd == SIOCGIFCONF) {
Stephen Hemminger6756ae42006-03-20 22:23:58 -08004913 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07004914 ret = dev_ifconf(net, (char __user *) arg);
Stephen Hemminger6756ae42006-03-20 22:23:58 -08004915 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004916 return ret;
4917 }
4918 if (cmd == SIOCGIFNAME)
Eric W. Biederman881d9662007-09-17 11:56:21 -07004919 return dev_ifname(net, (struct ifreq __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004920
4921 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4922 return -EFAULT;
4923
4924 ifr.ifr_name[IFNAMSIZ-1] = 0;
4925
4926 colon = strchr(ifr.ifr_name, ':');
4927 if (colon)
4928 *colon = 0;
4929
4930 /*
4931 * See which interface the caller is talking about.
4932 */
4933
4934 switch (cmd) {
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004935 /*
4936 * These ioctl calls:
4937 * - can be done by all.
4938 * - atomic and do not require locking.
4939 * - return a value
4940 */
4941 case SIOCGIFFLAGS:
4942 case SIOCGIFMETRIC:
4943 case SIOCGIFMTU:
4944 case SIOCGIFHWADDR:
4945 case SIOCGIFSLAVE:
4946 case SIOCGIFMAP:
4947 case SIOCGIFINDEX:
4948 case SIOCGIFTXQLEN:
4949 dev_load(net, ifr.ifr_name);
Eric Dumazet3710bec2009-11-01 19:42:09 +00004950 rcu_read_lock();
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004951 ret = dev_ifsioc_locked(net, &ifr, cmd);
Eric Dumazet3710bec2009-11-01 19:42:09 +00004952 rcu_read_unlock();
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004953 if (!ret) {
4954 if (colon)
4955 *colon = ':';
4956 if (copy_to_user(arg, &ifr,
4957 sizeof(struct ifreq)))
4958 ret = -EFAULT;
4959 }
4960 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004961
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004962 case SIOCETHTOOL:
4963 dev_load(net, ifr.ifr_name);
4964 rtnl_lock();
4965 ret = dev_ethtool(net, &ifr);
4966 rtnl_unlock();
4967 if (!ret) {
4968 if (colon)
4969 *colon = ':';
4970 if (copy_to_user(arg, &ifr,
4971 sizeof(struct ifreq)))
4972 ret = -EFAULT;
4973 }
4974 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004975
Eric Dumazetd1b19df2009-09-03 01:29:39 -07004976 /*
4977 * These ioctl calls:
4978 * - require superuser power.
4979 * - require strict serialization.
4980 * - return a value
4981 */
4982 case SIOCGMIIPHY:
4983 case SIOCGMIIREG:
4984 case SIOCSIFNAME:
4985 if (!capable(CAP_NET_ADMIN))
4986 return -EPERM;
4987 dev_load(net, ifr.ifr_name);
4988 rtnl_lock();
4989 ret = dev_ifsioc(net, &ifr, cmd);
4990 rtnl_unlock();
4991 if (!ret) {
4992 if (colon)
4993 *colon = ':';
4994 if (copy_to_user(arg, &ifr,
4995 sizeof(struct ifreq)))
4996 ret = -EFAULT;
4997 }
4998 return ret;
4999
5000 /*
5001 * These ioctl calls:
5002 * - require superuser power.
5003 * - require strict serialization.
5004 * - do not return a value
5005 */
5006 case SIOCSIFFLAGS:
5007 case SIOCSIFMETRIC:
5008 case SIOCSIFMTU:
5009 case SIOCSIFMAP:
5010 case SIOCSIFHWADDR:
5011 case SIOCSIFSLAVE:
5012 case SIOCADDMULTI:
5013 case SIOCDELMULTI:
5014 case SIOCSIFHWBROADCAST:
5015 case SIOCSIFTXQLEN:
5016 case SIOCSMIIREG:
5017 case SIOCBONDENSLAVE:
5018 case SIOCBONDRELEASE:
5019 case SIOCBONDSETHWADDR:
5020 case SIOCBONDCHANGEACTIVE:
5021 case SIOCBRADDIF:
5022 case SIOCBRDELIF:
5023 case SIOCSHWTSTAMP:
5024 if (!capable(CAP_NET_ADMIN))
5025 return -EPERM;
5026 /* fall through */
5027 case SIOCBONDSLAVEINFOQUERY:
5028 case SIOCBONDINFOQUERY:
5029 dev_load(net, ifr.ifr_name);
5030 rtnl_lock();
5031 ret = dev_ifsioc(net, &ifr, cmd);
5032 rtnl_unlock();
5033 return ret;
5034
5035 case SIOCGIFMEM:
5036 /* Get the per device memory space. We can add this but
5037 * currently do not support it */
5038 case SIOCSIFMEM:
5039 /* Set the per device memory buffer space.
5040 * Not applicable in our case */
5041 case SIOCSIFLINK:
5042 return -EINVAL;
5043
5044 /*
5045 * Unknown or private ioctl.
5046 */
5047 default:
5048 if (cmd == SIOCWANDEV ||
5049 (cmd >= SIOCDEVPRIVATE &&
5050 cmd <= SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07005051 dev_load(net, ifr.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005052 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07005053 ret = dev_ifsioc(net, &ifr, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005054 rtnl_unlock();
Eric Dumazetd1b19df2009-09-03 01:29:39 -07005055 if (!ret && copy_to_user(arg, &ifr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005056 sizeof(struct ifreq)))
Eric Dumazetd1b19df2009-09-03 01:29:39 -07005057 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005058 return ret;
Eric Dumazetd1b19df2009-09-03 01:29:39 -07005059 }
5060 /* Take care of Wireless Extensions */
5061 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5062 return wext_handle_ioctl(net, &ifr, cmd, arg);
5063 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005064 }
5065}
5066
5067
5068/**
5069 * dev_new_index - allocate an ifindex
Randy Dunlapc4ea43c2007-10-12 21:17:49 -07005070 * @net: the applicable net namespace
Linus Torvalds1da177e2005-04-16 15:20:36 -07005071 *
5072 * Returns a suitable unique value for a new device interface
5073 * number. The caller must hold the rtnl semaphore or the
5074 * dev_base_lock to be sure it remains unique.
5075 */
Eric W. Biederman881d9662007-09-17 11:56:21 -07005076static int dev_new_index(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005077{
5078 static int ifindex;
5079 for (;;) {
5080 if (++ifindex <= 0)
5081 ifindex = 1;
Eric W. Biederman881d9662007-09-17 11:56:21 -07005082 if (!__dev_get_by_index(net, ifindex))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005083 return ifindex;
5084 }
5085}
5086
Linus Torvalds1da177e2005-04-16 15:20:36 -07005087/* Delayed registration/unregisteration */
Denis Cheng3b5b34f2007-12-07 00:49:17 -08005088static LIST_HEAD(net_todo_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005089
Stephen Hemminger6f05f622007-03-08 20:46:03 -08005090static void net_set_todo(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005091{
Linus Torvalds1da177e2005-04-16 15:20:36 -07005092 list_add_tail(&dev->todo_list, &net_todo_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005093}
5094
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005095static void rollback_registered_many(struct list_head *head)
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005096{
Krishna Kumare93737b2009-12-08 22:26:02 +00005097 struct net_device *dev, *tmp;
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005098
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005099 BUG_ON(dev_boot_phase);
5100 ASSERT_RTNL();
5101
Krishna Kumare93737b2009-12-08 22:26:02 +00005102 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005103 /* Some devices call without registering
Krishna Kumare93737b2009-12-08 22:26:02 +00005104 * for initialization unwind. Remove those
5105 * devices and proceed with the remaining.
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005106 */
5107 if (dev->reg_state == NETREG_UNINITIALIZED) {
5108 pr_debug("unregister_netdevice: device %s/%p never "
5109 "was registered\n", dev->name, dev);
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005110
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005111 WARN_ON(1);
Krishna Kumare93737b2009-12-08 22:26:02 +00005112 list_del(&dev->unreg_list);
5113 continue;
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005114 }
5115
5116 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5117
5118 /* If device is running, close it first. */
5119 dev_close(dev);
5120
5121 /* And unlink it from device chain. */
5122 unlist_netdevice(dev);
5123
5124 dev->reg_state = NETREG_UNREGISTERING;
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005125 }
5126
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005127 synchronize_net();
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005128
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005129 list_for_each_entry(dev, head, unreg_list) {
5130 /* Shutdown queueing discipline. */
5131 dev_shutdown(dev);
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005132
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005133
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005134 /* Notify protocols, that we are about to destroy
5135 this device. They should clean all the things.
5136 */
5137 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5138
Patrick McHardya2835762010-02-26 06:34:51 +00005139 if (!dev->rtnl_link_ops ||
5140 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5141 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5142
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005143 /*
5144 * Flush the unicast and multicast chains
5145 */
5146 dev_unicast_flush(dev);
5147 dev_addr_discard(dev);
5148
5149 if (dev->netdev_ops->ndo_uninit)
5150 dev->netdev_ops->ndo_uninit(dev);
5151
5152 /* Notifier chain MUST detach us from master device. */
5153 WARN_ON(dev->master);
5154
5155 /* Remove entries from kobject tree */
5156 netdev_unregister_kobject(dev);
5157 }
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005158
Eric W. Biedermana5ee1552009-11-29 15:45:58 +00005159 /* Process any work delayed until the end of the batch */
stephen hemmingere5e26d72010-02-24 14:01:38 +00005160 dev = list_first_entry(head, struct net_device, unreg_list);
Eric W. Biedermana5ee1552009-11-29 15:45:58 +00005161 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5162
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005163 synchronize_net();
5164
Eric W. Biedermana5ee1552009-11-29 15:45:58 +00005165 list_for_each_entry(dev, head, unreg_list)
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005166 dev_put(dev);
5167}
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005168
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005169static void rollback_registered(struct net_device *dev)
5170{
5171 LIST_HEAD(single);
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005172
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005173 list_add(&dev->unreg_list, &single);
5174 rollback_registered_many(&single);
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005175}
5176
David S. Millere8a04642008-07-17 00:34:19 -07005177static void __netdev_init_queue_locks_one(struct net_device *dev,
5178 struct netdev_queue *dev_queue,
5179 void *_unused)
David S. Millerc773e842008-07-08 23:13:53 -07005180{
5181 spin_lock_init(&dev_queue->_xmit_lock);
David S. Millercf508b12008-07-22 14:16:42 -07005182 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
David S. Millerc773e842008-07-08 23:13:53 -07005183 dev_queue->xmit_lock_owner = -1;
5184}
5185
5186static void netdev_init_queue_locks(struct net_device *dev)
5187{
David S. Millere8a04642008-07-17 00:34:19 -07005188 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
5189 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
David S. Millerc773e842008-07-08 23:13:53 -07005190}
5191
Herbert Xub63365a2008-10-23 01:11:29 -07005192unsigned long netdev_fix_features(unsigned long features, const char *name)
5193{
5194 /* Fix illegal SG+CSUM combinations. */
5195 if ((features & NETIF_F_SG) &&
5196 !(features & NETIF_F_ALL_CSUM)) {
5197 if (name)
5198 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
5199 "checksum feature.\n", name);
5200 features &= ~NETIF_F_SG;
5201 }
5202
5203 /* TSO requires that SG is present as well. */
5204 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
5205 if (name)
5206 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
5207 "SG feature.\n", name);
5208 features &= ~NETIF_F_TSO;
5209 }
5210
5211 if (features & NETIF_F_UFO) {
5212 if (!(features & NETIF_F_GEN_CSUM)) {
5213 if (name)
5214 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
5215 "since no NETIF_F_HW_CSUM feature.\n",
5216 name);
5217 features &= ~NETIF_F_UFO;
5218 }
5219
5220 if (!(features & NETIF_F_SG)) {
5221 if (name)
5222 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
5223 "since no NETIF_F_SG feature.\n", name);
5224 features &= ~NETIF_F_UFO;
5225 }
5226 }
5227
5228 return features;
5229}
5230EXPORT_SYMBOL(netdev_fix_features);
5231
Linus Torvalds1da177e2005-04-16 15:20:36 -07005232/**
Patrick Mullaneyfc4a7482009-12-03 15:59:22 -08005233 * netif_stacked_transfer_operstate - transfer operstate
5234 * @rootdev: the root or lower level device to transfer state from
5235 * @dev: the device to transfer operstate to
5236 *
5237 * Transfer operational state from root to device. This is normally
5238 * called when a stacking relationship exists between the root
5239 * device and the device(a leaf device).
5240 */
5241void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5242 struct net_device *dev)
5243{
5244 if (rootdev->operstate == IF_OPER_DORMANT)
5245 netif_dormant_on(dev);
5246 else
5247 netif_dormant_off(dev);
5248
5249 if (netif_carrier_ok(rootdev)) {
5250 if (!netif_carrier_ok(dev))
5251 netif_carrier_on(dev);
5252 } else {
5253 if (netif_carrier_ok(dev))
5254 netif_carrier_off(dev);
5255 }
5256}
5257EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5258
5259/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005260 * register_netdevice - register a network device
5261 * @dev: device to register
5262 *
5263 * Take a completed network device structure and add it to the kernel
5264 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5265 * chain. 0 is returned on success. A negative errno code is returned
5266 * on a failure to set up the device, or if the name is a duplicate.
5267 *
5268 * Callers must hold the rtnl semaphore. You may want
5269 * register_netdev() instead of this.
5270 *
5271 * BUGS:
5272 * The locking appears insufficient to guarantee two parallel registers
5273 * will not get the same name.
5274 */
5275
5276int register_netdevice(struct net_device *dev)
5277{
Linus Torvalds1da177e2005-04-16 15:20:36 -07005278 int ret;
Stephen Hemmingerd3147742008-11-19 21:32:24 -08005279 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005280
5281 BUG_ON(dev_boot_phase);
5282 ASSERT_RTNL();
5283
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005284 might_sleep();
5285
Linus Torvalds1da177e2005-04-16 15:20:36 -07005286 /* When net_device's are persistent, this will be fatal. */
5287 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
Stephen Hemmingerd3147742008-11-19 21:32:24 -08005288 BUG_ON(!net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005289
David S. Millerf1f28aa2008-07-15 00:08:33 -07005290 spin_lock_init(&dev->addr_list_lock);
David S. Millercf508b12008-07-22 14:16:42 -07005291 netdev_set_addr_lockdep_class(dev);
David S. Millerc773e842008-07-08 23:13:53 -07005292 netdev_init_queue_locks(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005293
Linus Torvalds1da177e2005-04-16 15:20:36 -07005294 dev->iflink = -1;
5295
Eric Dumazetdf334542010-03-24 19:13:54 +00005296#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00005297 if (!dev->num_rx_queues) {
5298 /*
5299 * Allocate a single RX queue if driver never called
5300 * alloc_netdev_mq
5301 */
5302
5303 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
5304 if (!dev->_rx) {
5305 ret = -ENOMEM;
5306 goto out;
5307 }
5308
5309 dev->_rx->first = dev->_rx;
5310 atomic_set(&dev->_rx->count, 1);
5311 dev->num_rx_queues = 1;
5312 }
Eric Dumazetdf334542010-03-24 19:13:54 +00005313#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07005314 /* Init, if this function is available */
Stephen Hemmingerd3147742008-11-19 21:32:24 -08005315 if (dev->netdev_ops->ndo_init) {
5316 ret = dev->netdev_ops->ndo_init(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005317 if (ret) {
5318 if (ret > 0)
5319 ret = -EIO;
Adrian Bunk90833aa2006-11-13 16:02:22 -08005320 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005321 }
5322 }
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09005323
Octavian Purdilad9031022009-11-18 02:36:59 +00005324 ret = dev_get_valid_name(net, dev->name, dev->name, 0);
5325 if (ret)
Herbert Xu7ce1b0e2007-07-30 16:29:40 -07005326 goto err_uninit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005327
Eric W. Biederman881d9662007-09-17 11:56:21 -07005328 dev->ifindex = dev_new_index(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005329 if (dev->iflink == -1)
5330 dev->iflink = dev->ifindex;
5331
Stephen Hemmingerd212f872007-06-27 00:47:37 -07005332 /* Fix illegal checksum combinations */
5333 if ((dev->features & NETIF_F_HW_CSUM) &&
5334 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5335 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
5336 dev->name);
5337 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5338 }
5339
5340 if ((dev->features & NETIF_F_NO_CSUM) &&
5341 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5342 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
5343 dev->name);
5344 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5345 }
5346
Herbert Xub63365a2008-10-23 01:11:29 -07005347 dev->features = netdev_fix_features(dev->features, dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005348
Lennert Buytenheke5a4a722008-08-03 01:23:10 -07005349 /* Enable software GSO if SG is supported. */
5350 if (dev->features & NETIF_F_SG)
5351 dev->features |= NETIF_F_GSO;
5352
Daniel Lezcanoaaf8cdc2008-05-02 17:00:58 -07005353 netdev_initialize_kobject(dev);
Johannes Berg7ffbe3f2009-10-02 05:15:27 +00005354
5355 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5356 ret = notifier_to_errno(ret);
5357 if (ret)
5358 goto err_uninit;
5359
Eric W. Biederman8b41d182007-09-26 22:02:53 -07005360 ret = netdev_register_kobject(dev);
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005361 if (ret)
Herbert Xu7ce1b0e2007-07-30 16:29:40 -07005362 goto err_uninit;
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005363 dev->reg_state = NETREG_REGISTERED;
5364
Linus Torvalds1da177e2005-04-16 15:20:36 -07005365 /*
5366 * Default initial state at registry is that the
5367 * device is present.
5368 */
5369
5370 set_bit(__LINK_STATE_PRESENT, &dev->state);
5371
Linus Torvalds1da177e2005-04-16 15:20:36 -07005372 dev_init_scheduler(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005373 dev_hold(dev);
Eric W. Biedermance286d32007-09-12 13:53:49 +02005374 list_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005375
5376 /* Notify protocols, that a new device appeared. */
Pavel Emelyanov056925a2007-09-16 15:42:43 -07005377 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
Herbert Xufcc5a032007-07-30 17:03:38 -07005378 ret = notifier_to_errno(ret);
Daniel Lezcano93ee31f2007-10-30 15:38:18 -07005379 if (ret) {
5380 rollback_registered(dev);
5381 dev->reg_state = NETREG_UNREGISTERED;
5382 }
Eric W. Biedermand90a9092009-12-12 22:11:15 +00005383 /*
5384 * Prevent userspace races by waiting until the network
5385 * device is fully setup before sending notifications.
5386 */
Patrick McHardya2835762010-02-26 06:34:51 +00005387 if (!dev->rtnl_link_ops ||
5388 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5389 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005390
5391out:
5392 return ret;
Herbert Xu7ce1b0e2007-07-30 16:29:40 -07005393
5394err_uninit:
Stephen Hemmingerd3147742008-11-19 21:32:24 -08005395 if (dev->netdev_ops->ndo_uninit)
5396 dev->netdev_ops->ndo_uninit(dev);
Herbert Xu7ce1b0e2007-07-30 16:29:40 -07005397 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005398}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07005399EXPORT_SYMBOL(register_netdevice);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005400
5401/**
Benjamin Herrenschmidt937f1ba2009-01-14 21:05:05 -08005402 * init_dummy_netdev - init a dummy network device for NAPI
5403 * @dev: device to init
5404 *
5405 * This takes a network device structure and initialize the minimum
5406 * amount of fields so it can be used to schedule NAPI polls without
5407 * registering a full blown interface. This is to be used by drivers
5408 * that need to tie several hardware interfaces to a single NAPI
5409 * poll scheduler due to HW limitations.
5410 */
5411int init_dummy_netdev(struct net_device *dev)
5412{
5413 /* Clear everything. Note we don't initialize spinlocks
5414 * are they aren't supposed to be taken by any of the
5415 * NAPI code and this dummy netdev is supposed to be
5416 * only ever used for NAPI polls
5417 */
5418 memset(dev, 0, sizeof(struct net_device));
5419
5420 /* make sure we BUG if trying to hit standard
5421 * register/unregister code path
5422 */
5423 dev->reg_state = NETREG_DUMMY;
5424
5425 /* initialize the ref count */
5426 atomic_set(&dev->refcnt, 1);
5427
5428 /* NAPI wants this */
5429 INIT_LIST_HEAD(&dev->napi_list);
5430
5431 /* a dummy interface is started by default */
5432 set_bit(__LINK_STATE_PRESENT, &dev->state);
5433 set_bit(__LINK_STATE_START, &dev->state);
5434
5435 return 0;
5436}
5437EXPORT_SYMBOL_GPL(init_dummy_netdev);
5438
5439
5440/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005441 * register_netdev - register a network device
5442 * @dev: device to register
5443 *
5444 * Take a completed network device structure and add it to the kernel
5445 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5446 * chain. 0 is returned on success. A negative errno code is returned
5447 * on a failure to set up the device, or if the name is a duplicate.
5448 *
Borislav Petkov38b4da32007-04-20 22:14:10 -07005449 * This is a wrapper around register_netdevice that takes the rtnl semaphore
Linus Torvalds1da177e2005-04-16 15:20:36 -07005450 * and expands the device name if you passed a format string to
5451 * alloc_netdev.
5452 */
5453int register_netdev(struct net_device *dev)
5454{
5455 int err;
5456
5457 rtnl_lock();
5458
5459 /*
5460 * If the name is a format string the caller wants us to do a
5461 * name allocation.
5462 */
5463 if (strchr(dev->name, '%')) {
5464 err = dev_alloc_name(dev, dev->name);
5465 if (err < 0)
5466 goto out;
5467 }
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09005468
Linus Torvalds1da177e2005-04-16 15:20:36 -07005469 err = register_netdevice(dev);
5470out:
5471 rtnl_unlock();
5472 return err;
5473}
5474EXPORT_SYMBOL(register_netdev);
5475
5476/*
5477 * netdev_wait_allrefs - wait until all references are gone.
5478 *
5479 * This is called when unregistering network devices.
5480 *
5481 * Any protocol or device that holds a reference should register
5482 * for netdevice notification, and cleanup and put back the
5483 * reference if they receive an UNREGISTER event.
5484 * We can get stuck here if buggy protocols don't correctly
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09005485 * call dev_put.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005486 */
5487static void netdev_wait_allrefs(struct net_device *dev)
5488{
5489 unsigned long rebroadcast_time, warning_time;
5490
Eric Dumazete014deb2009-11-17 05:59:21 +00005491 linkwatch_forget_dev(dev);
5492
Linus Torvalds1da177e2005-04-16 15:20:36 -07005493 rebroadcast_time = warning_time = jiffies;
5494 while (atomic_read(&dev->refcnt) != 0) {
5495 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
Stephen Hemminger6756ae42006-03-20 22:23:58 -08005496 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005497
5498 /* Rebroadcast unregister notification */
Pavel Emelyanov056925a2007-09-16 15:42:43 -07005499 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
Eric W. Biedermana5ee1552009-11-29 15:45:58 +00005500 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
Octavian Purdila395264d2009-11-16 13:49:35 +00005501 * should have already handle it the first time */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005502
5503 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5504 &dev->state)) {
5505 /* We must not have linkwatch events
5506 * pending on unregister. If this
5507 * happens, we simply run the queue
5508 * unscheduled, resulting in a noop
5509 * for this device.
5510 */
5511 linkwatch_run_queue();
5512 }
5513
Stephen Hemminger6756ae42006-03-20 22:23:58 -08005514 __rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005515
5516 rebroadcast_time = jiffies;
5517 }
5518
5519 msleep(250);
5520
5521 if (time_after(jiffies, warning_time + 10 * HZ)) {
5522 printk(KERN_EMERG "unregister_netdevice: "
5523 "waiting for %s to become free. Usage "
5524 "count = %d\n",
5525 dev->name, atomic_read(&dev->refcnt));
5526 warning_time = jiffies;
5527 }
5528 }
5529}
5530
5531/* The sequence is:
5532 *
5533 * rtnl_lock();
5534 * ...
5535 * register_netdevice(x1);
5536 * register_netdevice(x2);
5537 * ...
5538 * unregister_netdevice(y1);
5539 * unregister_netdevice(y2);
5540 * ...
5541 * rtnl_unlock();
5542 * free_netdev(y1);
5543 * free_netdev(y2);
5544 *
Herbert Xu58ec3b42008-10-07 15:50:03 -07005545 * We are invoked by rtnl_unlock().
Linus Torvalds1da177e2005-04-16 15:20:36 -07005546 * This allows us to deal with problems:
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005547 * 1) We can delete sysfs objects which invoke hotplug
Linus Torvalds1da177e2005-04-16 15:20:36 -07005548 * without deadlocking with linkwatch via keventd.
5549 * 2) Since we run with the RTNL semaphore not held, we can sleep
5550 * safely in order to wait for the netdev refcnt to drop to zero.
Herbert Xu58ec3b42008-10-07 15:50:03 -07005551 *
5552 * We must not return until all unregister events added during
5553 * the interval the lock was held have been completed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005554 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005555void netdev_run_todo(void)
5556{
Oleg Nesterov626ab0e2006-06-23 02:05:55 -07005557 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005558
Linus Torvalds1da177e2005-04-16 15:20:36 -07005559 /* Snapshot list, allow later requests */
Oleg Nesterov626ab0e2006-06-23 02:05:55 -07005560 list_replace_init(&net_todo_list, &list);
Herbert Xu58ec3b42008-10-07 15:50:03 -07005561
5562 __rtnl_unlock();
Oleg Nesterov626ab0e2006-06-23 02:05:55 -07005563
Linus Torvalds1da177e2005-04-16 15:20:36 -07005564 while (!list_empty(&list)) {
5565 struct net_device *dev
stephen hemmingere5e26d72010-02-24 14:01:38 +00005566 = list_first_entry(&list, struct net_device, todo_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005567 list_del(&dev->todo_list);
5568
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005569 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005570 printk(KERN_ERR "network todo '%s' but state %d\n",
5571 dev->name, dev->reg_state);
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005572 dump_stack();
5573 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005574 }
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005575
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005576 dev->reg_state = NETREG_UNREGISTERED;
5577
Changli Gao152102c2010-03-30 20:16:22 +00005578 on_each_cpu(flush_backlog, dev, 1);
Stephen Hemminger6e583ce2008-08-03 21:29:57 -07005579
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005580 netdev_wait_allrefs(dev);
5581
5582 /* paranoia */
5583 BUG_ON(atomic_read(&dev->refcnt));
Ilpo Järvinen547b7922008-07-25 21:43:18 -07005584 WARN_ON(dev->ip_ptr);
5585 WARN_ON(dev->ip6_ptr);
5586 WARN_ON(dev->dn_ptr);
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005587
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07005588 if (dev->destructor)
5589 dev->destructor(dev);
Stephen Hemminger9093bbb2007-05-19 15:39:25 -07005590
5591 /* Free network device */
5592 kobject_put(&dev->dev.kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005593 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005594}
5595
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -08005596/**
Eric Dumazetd83345a2009-11-16 03:36:51 +00005597 * dev_txq_stats_fold - fold tx_queues stats
5598 * @dev: device to get statistics from
5599 * @stats: struct net_device_stats to hold results
5600 */
5601void dev_txq_stats_fold(const struct net_device *dev,
5602 struct net_device_stats *stats)
5603{
5604 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5605 unsigned int i;
5606 struct netdev_queue *txq;
5607
5608 for (i = 0; i < dev->num_tx_queues; i++) {
5609 txq = netdev_get_tx_queue(dev, i);
5610 tx_bytes += txq->tx_bytes;
5611 tx_packets += txq->tx_packets;
5612 tx_dropped += txq->tx_dropped;
5613 }
5614 if (tx_bytes || tx_packets || tx_dropped) {
5615 stats->tx_bytes = tx_bytes;
5616 stats->tx_packets = tx_packets;
5617 stats->tx_dropped = tx_dropped;
5618 }
5619}
5620EXPORT_SYMBOL(dev_txq_stats_fold);
5621
5622/**
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -08005623 * dev_get_stats - get network device statistics
5624 * @dev: device to get statistics from
5625 *
5626 * Get network statistics from device. The device driver may provide
5627 * its own method by setting dev->netdev_ops->get_stats; otherwise
5628 * the internal statistics structure is used.
5629 */
5630const struct net_device_stats *dev_get_stats(struct net_device *dev)
Eric Dumazet7004bf22009-05-18 00:34:33 +00005631{
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -08005632 const struct net_device_ops *ops = dev->netdev_ops;
5633
5634 if (ops->ndo_get_stats)
5635 return ops->ndo_get_stats(dev);
Eric Dumazet7004bf22009-05-18 00:34:33 +00005636
Eric Dumazetd83345a2009-11-16 03:36:51 +00005637 dev_txq_stats_fold(dev, &dev->stats);
5638 return &dev->stats;
Rusty Russellc45d2862007-03-28 14:29:08 -07005639}
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -08005640EXPORT_SYMBOL(dev_get_stats);
Rusty Russellc45d2862007-03-28 14:29:08 -07005641
David S. Millerdc2b4842008-07-08 17:18:23 -07005642static void netdev_init_one_queue(struct net_device *dev,
David S. Millere8a04642008-07-17 00:34:19 -07005643 struct netdev_queue *queue,
5644 void *_unused)
David S. Millerdc2b4842008-07-08 17:18:23 -07005645{
David S. Millerdc2b4842008-07-08 17:18:23 -07005646 queue->dev = dev;
5647}
5648
David S. Millerbb949fb2008-07-08 16:55:56 -07005649static void netdev_init_queues(struct net_device *dev)
5650{
David S. Millere8a04642008-07-17 00:34:19 -07005651 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5652 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
David S. Millerc3f26a22008-07-31 16:58:50 -07005653 spin_lock_init(&dev->tx_global_lock);
David S. Millerbb949fb2008-07-08 16:55:56 -07005654}
5655
Linus Torvalds1da177e2005-04-16 15:20:36 -07005656/**
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07005657 * alloc_netdev_mq - allocate network device
Linus Torvalds1da177e2005-04-16 15:20:36 -07005658 * @sizeof_priv: size of private data to allocate space for
5659 * @name: device name format string
5660 * @setup: callback to initialize device
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07005661 * @queue_count: the number of subqueues to allocate
Linus Torvalds1da177e2005-04-16 15:20:36 -07005662 *
5663 * Allocates a struct net_device with private data area for driver use
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07005664 * and performs basic initialization. Also allocates subquue structs
5665 * for each queue on the device at the end of the netdevice.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005666 */
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07005667struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5668 void (*setup)(struct net_device *), unsigned int queue_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005669{
David S. Millere8a04642008-07-17 00:34:19 -07005670 struct netdev_queue *tx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005671 struct net_device *dev;
Stephen Hemminger79439862008-07-21 13:28:44 -07005672 size_t alloc_size;
Eric Dumazet1ce8e7b2009-05-27 04:42:37 +00005673 struct net_device *p;
Eric Dumazetdf334542010-03-24 19:13:54 +00005674#ifdef CONFIG_RPS
5675 struct netdev_rx_queue *rx;
Tom Herbert0a9627f2010-03-16 08:03:29 +00005676 int i;
Eric Dumazetdf334542010-03-24 19:13:54 +00005677#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07005678
Stephen Hemmingerb6fe17d2006-08-29 17:06:13 -07005679 BUG_ON(strlen(name) >= sizeof(dev->name));
5680
David S. Millerfd2ea0a2008-07-17 01:56:23 -07005681 alloc_size = sizeof(struct net_device);
Alexey Dobriyand1643d22008-04-18 15:43:32 -07005682 if (sizeof_priv) {
5683 /* ensure 32-byte alignment of private area */
Eric Dumazet1ce8e7b2009-05-27 04:42:37 +00005684 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
Alexey Dobriyand1643d22008-04-18 15:43:32 -07005685 alloc_size += sizeof_priv;
5686 }
5687 /* ensure 32-byte alignment of whole construct */
Eric Dumazet1ce8e7b2009-05-27 04:42:37 +00005688 alloc_size += NETDEV_ALIGN - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005689
Paolo 'Blaisorblade' Giarrusso31380de2006-04-06 22:38:28 -07005690 p = kzalloc(alloc_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005691 if (!p) {
Stephen Hemmingerb6fe17d2006-08-29 17:06:13 -07005692 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005693 return NULL;
5694 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005695
Stephen Hemminger79439862008-07-21 13:28:44 -07005696 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
David S. Millere8a04642008-07-17 00:34:19 -07005697 if (!tx) {
5698 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5699 "tx qdiscs.\n");
Jiri Pirkoab9c73c2009-05-08 13:30:17 +00005700 goto free_p;
David S. Millere8a04642008-07-17 00:34:19 -07005701 }
5702
Eric Dumazetdf334542010-03-24 19:13:54 +00005703#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00005704 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5705 if (!rx) {
5706 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5707 "rx queues.\n");
5708 goto free_tx;
5709 }
5710
5711 atomic_set(&rx->count, queue_count);
5712
5713 /*
5714 * Set a pointer to first element in the array which holds the
5715 * reference count.
5716 */
5717 for (i = 0; i < queue_count; i++)
5718 rx[i].first = rx;
Eric Dumazetdf334542010-03-24 19:13:54 +00005719#endif
Tom Herbert0a9627f2010-03-16 08:03:29 +00005720
Eric Dumazet1ce8e7b2009-05-27 04:42:37 +00005721 dev = PTR_ALIGN(p, NETDEV_ALIGN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005722 dev->padded = (char *)dev - (char *)p;
Jiri Pirkoab9c73c2009-05-08 13:30:17 +00005723
5724 if (dev_addr_init(dev))
Tom Herbert0a9627f2010-03-16 08:03:29 +00005725 goto free_rx;
Jiri Pirkoab9c73c2009-05-08 13:30:17 +00005726
Jiri Pirkoccffad252009-05-22 23:22:17 +00005727 dev_unicast_init(dev);
5728
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005729 dev_net_set(dev, &init_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005730
David S. Millere8a04642008-07-17 00:34:19 -07005731 dev->_tx = tx;
5732 dev->num_tx_queues = queue_count;
David S. Millerfd2ea0a2008-07-17 01:56:23 -07005733 dev->real_num_tx_queues = queue_count;
David S. Millere8a04642008-07-17 00:34:19 -07005734
Eric Dumazetdf334542010-03-24 19:13:54 +00005735#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00005736 dev->_rx = rx;
5737 dev->num_rx_queues = queue_count;
Eric Dumazetdf334542010-03-24 19:13:54 +00005738#endif
Tom Herbert0a9627f2010-03-16 08:03:29 +00005739
Peter P Waskiewicz Jr82cc1a72008-03-21 03:43:19 -07005740 dev->gso_max_size = GSO_MAX_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005741
David S. Millerbb949fb2008-07-08 16:55:56 -07005742 netdev_init_queues(dev);
5743
Peter P Waskiewicz Jr15682bc2010-02-10 20:03:05 -08005744 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5745 dev->ethtool_ntuple_list.count = 0;
Herbert Xud565b0a2008-12-15 23:38:52 -08005746 INIT_LIST_HEAD(&dev->napi_list);
Eric W. Biederman9fdce092009-10-30 14:51:13 +00005747 INIT_LIST_HEAD(&dev->unreg_list);
Eric Dumazete014deb2009-11-17 05:59:21 +00005748 INIT_LIST_HEAD(&dev->link_watch_list);
Eric Dumazet93f154b2009-05-18 22:19:19 -07005749 dev->priv_flags = IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005750 setup(dev);
5751 strcpy(dev->name, name);
5752 return dev;
Jiri Pirkoab9c73c2009-05-08 13:30:17 +00005753
Tom Herbert0a9627f2010-03-16 08:03:29 +00005754free_rx:
Eric Dumazetdf334542010-03-24 19:13:54 +00005755#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00005756 kfree(rx);
Jiri Pirkoab9c73c2009-05-08 13:30:17 +00005757free_tx:
Eric Dumazetdf334542010-03-24 19:13:54 +00005758#endif
Jiri Pirkoab9c73c2009-05-08 13:30:17 +00005759 kfree(tx);
Jiri Pirkoab9c73c2009-05-08 13:30:17 +00005760free_p:
5761 kfree(p);
5762 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005763}
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07005764EXPORT_SYMBOL(alloc_netdev_mq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005765
5766/**
5767 * free_netdev - free network device
5768 * @dev: device
5769 *
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09005770 * This function does the last stage of destroying an allocated device
5771 * interface. The reference to the device object is released.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005772 * If this is the last reference then it will be freed.
5773 */
5774void free_netdev(struct net_device *dev)
5775{
Herbert Xud565b0a2008-12-15 23:38:52 -08005776 struct napi_struct *p, *n;
5777
Denis V. Lunevf3005d72008-04-16 02:02:18 -07005778 release_net(dev_net(dev));
5779
David S. Millere8a04642008-07-17 00:34:19 -07005780 kfree(dev->_tx);
5781
Jiri Pirkof001fde2009-05-05 02:48:28 +00005782 /* Flush device addresses */
5783 dev_addr_flush(dev);
5784
Peter P Waskiewicz Jr15682bc2010-02-10 20:03:05 -08005785 /* Clear ethtool n-tuple list */
5786 ethtool_ntuple_flush(dev);
5787
Herbert Xud565b0a2008-12-15 23:38:52 -08005788 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5789 netif_napi_del(p);
5790
Stephen Hemminger3041a062006-05-26 13:25:24 -07005791 /* Compatibility with error handling in drivers */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005792 if (dev->reg_state == NETREG_UNINITIALIZED) {
5793 kfree((char *)dev - dev->padded);
5794 return;
5795 }
5796
5797 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5798 dev->reg_state = NETREG_RELEASED;
5799
Greg Kroah-Hartman43cb76d2002-04-09 12:14:34 -07005800 /* will free via device release */
5801 put_device(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005802}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07005803EXPORT_SYMBOL(free_netdev);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09005804
Stephen Hemmingerf0db2752008-09-30 02:23:58 -07005805/**
5806 * synchronize_net - Synchronize with packet receive processing
5807 *
5808 * Wait for packets currently being received to be done.
5809 * Does not block later packets from starting.
5810 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09005811void synchronize_net(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005812{
5813 might_sleep();
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07005814 synchronize_rcu();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005815}
Eric Dumazetd1b19df2009-09-03 01:29:39 -07005816EXPORT_SYMBOL(synchronize_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005817
5818/**
Eric Dumazet44a08732009-10-27 07:03:04 +00005819 * unregister_netdevice_queue - remove device from the kernel
Linus Torvalds1da177e2005-04-16 15:20:36 -07005820 * @dev: device
Eric Dumazet44a08732009-10-27 07:03:04 +00005821 * @head: list
Jaswinder Singh Rajput6ebfbc02009-11-22 20:43:13 -08005822 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005823 * This function shuts down a device interface and removes it
Wang Chend59b54b2007-12-11 02:28:03 -08005824 * from the kernel tables.
Eric Dumazet44a08732009-10-27 07:03:04 +00005825 * If head not NULL, device is queued to be unregistered later.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005826 *
5827 * Callers must hold the rtnl semaphore. You may want
5828 * unregister_netdev() instead of this.
5829 */
5830
Eric Dumazet44a08732009-10-27 07:03:04 +00005831void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005832{
Herbert Xua6620712007-12-12 19:21:56 -08005833 ASSERT_RTNL();
5834
Eric Dumazet44a08732009-10-27 07:03:04 +00005835 if (head) {
Eric W. Biederman9fdce092009-10-30 14:51:13 +00005836 list_move_tail(&dev->unreg_list, head);
Eric Dumazet44a08732009-10-27 07:03:04 +00005837 } else {
5838 rollback_registered(dev);
5839 /* Finish processing unregister after unlock */
5840 net_set_todo(dev);
5841 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005842}
Eric Dumazet44a08732009-10-27 07:03:04 +00005843EXPORT_SYMBOL(unregister_netdevice_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005844
5845/**
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005846 * unregister_netdevice_many - unregister many devices
5847 * @head: list of devices
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005848 */
5849void unregister_netdevice_many(struct list_head *head)
5850{
5851 struct net_device *dev;
5852
5853 if (!list_empty(head)) {
5854 rollback_registered_many(head);
5855 list_for_each_entry(dev, head, unreg_list)
5856 net_set_todo(dev);
5857 }
5858}
Eric Dumazet63c80992009-10-27 07:06:49 +00005859EXPORT_SYMBOL(unregister_netdevice_many);
Eric Dumazet9b5e3832009-10-27 07:04:19 +00005860
5861/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07005862 * unregister_netdev - remove device from the kernel
5863 * @dev: device
5864 *
5865 * This function shuts down a device interface and removes it
Wang Chend59b54b2007-12-11 02:28:03 -08005866 * from the kernel tables.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005867 *
5868 * This is just a wrapper for unregister_netdevice that takes
5869 * the rtnl semaphore. In general you want to use this and not
5870 * unregister_netdevice.
5871 */
5872void unregister_netdev(struct net_device *dev)
5873{
5874 rtnl_lock();
5875 unregister_netdevice(dev);
5876 rtnl_unlock();
5877}
Linus Torvalds1da177e2005-04-16 15:20:36 -07005878EXPORT_SYMBOL(unregister_netdev);
5879
Eric W. Biedermance286d32007-09-12 13:53:49 +02005880/**
5881 * dev_change_net_namespace - move device to different nethost namespace
5882 * @dev: device
5883 * @net: network namespace
5884 * @pat: If not NULL name pattern to try if the current device name
5885 * is already taken in the destination network namespace.
5886 *
5887 * This function shuts down a device interface and moves it
5888 * to a new network namespace. On success 0 is returned, on
5889 * a failure a netagive errno code is returned.
5890 *
5891 * Callers must hold the rtnl semaphore.
5892 */
5893
5894int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5895{
Eric W. Biedermance286d32007-09-12 13:53:49 +02005896 int err;
5897
5898 ASSERT_RTNL();
5899
5900 /* Don't allow namespace local devices to be moved. */
5901 err = -EINVAL;
5902 if (dev->features & NETIF_F_NETNS_LOCAL)
5903 goto out;
5904
Eric W. Biederman38918452008-10-27 17:51:47 -07005905#ifdef CONFIG_SYSFS
5906 /* Don't allow real devices to be moved when sysfs
5907 * is enabled.
5908 */
5909 err = -EINVAL;
5910 if (dev->dev.parent)
5911 goto out;
5912#endif
5913
Eric W. Biedermance286d32007-09-12 13:53:49 +02005914 /* Ensure the device has been registrered */
5915 err = -EINVAL;
5916 if (dev->reg_state != NETREG_REGISTERED)
5917 goto out;
5918
5919 /* Get out if there is nothing todo */
5920 err = 0;
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09005921 if (net_eq(dev_net(dev), net))
Eric W. Biedermance286d32007-09-12 13:53:49 +02005922 goto out;
5923
5924 /* Pick the destination device name, and ensure
5925 * we can use it in the destination network namespace.
5926 */
5927 err = -EEXIST;
Octavian Purdilad9031022009-11-18 02:36:59 +00005928 if (__dev_get_by_name(net, dev->name)) {
Eric W. Biedermance286d32007-09-12 13:53:49 +02005929 /* We get here if we can't use the current device name */
5930 if (!pat)
5931 goto out;
Octavian Purdilad9031022009-11-18 02:36:59 +00005932 if (dev_get_valid_name(net, pat, dev->name, 1))
Eric W. Biedermance286d32007-09-12 13:53:49 +02005933 goto out;
5934 }
5935
5936 /*
5937 * And now a mini version of register_netdevice unregister_netdevice.
5938 */
5939
5940 /* If device is running close it first. */
Pavel Emelyanov9b772652007-10-10 02:49:09 -07005941 dev_close(dev);
Eric W. Biedermance286d32007-09-12 13:53:49 +02005942
5943 /* And unlink it from device chain */
5944 err = -ENODEV;
5945 unlist_netdevice(dev);
5946
5947 synchronize_net();
5948
5949 /* Shutdown queueing discipline. */
5950 dev_shutdown(dev);
5951
5952 /* Notify protocols, that we are about to destroy
5953 this device. They should clean all the things.
5954 */
5955 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
Eric W. Biedermana5ee1552009-11-29 15:45:58 +00005956 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
Eric W. Biedermance286d32007-09-12 13:53:49 +02005957
5958 /*
5959 * Flush the unicast and multicast chains
5960 */
Jiri Pirkoccffad252009-05-22 23:22:17 +00005961 dev_unicast_flush(dev);
Eric W. Biedermance286d32007-09-12 13:53:49 +02005962 dev_addr_discard(dev);
5963
Eric W. Biederman38918452008-10-27 17:51:47 -07005964 netdev_unregister_kobject(dev);
5965
Eric W. Biedermance286d32007-09-12 13:53:49 +02005966 /* Actually switch the network namespace */
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005967 dev_net_set(dev, net);
Eric W. Biedermance286d32007-09-12 13:53:49 +02005968
Eric W. Biedermance286d32007-09-12 13:53:49 +02005969 /* If there is an ifindex conflict assign a new one */
5970 if (__dev_get_by_index(net, dev->ifindex)) {
5971 int iflink = (dev->iflink == dev->ifindex);
5972 dev->ifindex = dev_new_index(net);
5973 if (iflink)
5974 dev->iflink = dev->ifindex;
5975 }
5976
Eric W. Biederman8b41d182007-09-26 22:02:53 -07005977 /* Fixup kobjects */
Daniel Lezcanoaaf8cdc2008-05-02 17:00:58 -07005978 err = netdev_register_kobject(dev);
Eric W. Biederman8b41d182007-09-26 22:02:53 -07005979 WARN_ON(err);
Eric W. Biedermance286d32007-09-12 13:53:49 +02005980
5981 /* Add the device back in the hashes */
5982 list_netdevice(dev);
5983
5984 /* Notify protocols, that a new device appeared. */
5985 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5986
Eric W. Biedermand90a9092009-12-12 22:11:15 +00005987 /*
5988 * Prevent userspace races by waiting until the network
5989 * device is fully setup before sending notifications.
5990 */
5991 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5992
Eric W. Biedermance286d32007-09-12 13:53:49 +02005993 synchronize_net();
5994 err = 0;
5995out:
5996 return err;
5997}
Johannes Berg463d0182009-07-14 00:33:35 +02005998EXPORT_SYMBOL_GPL(dev_change_net_namespace);
Eric W. Biedermance286d32007-09-12 13:53:49 +02005999
Linus Torvalds1da177e2005-04-16 15:20:36 -07006000static int dev_cpu_callback(struct notifier_block *nfb,
6001 unsigned long action,
6002 void *ocpu)
6003{
6004 struct sk_buff **list_skb;
David S. Miller37437bb2008-07-16 02:15:04 -07006005 struct Qdisc **list_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006006 struct sk_buff *skb;
6007 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6008 struct softnet_data *sd, *oldsd;
6009
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -07006010 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006011 return NOTIFY_OK;
6012
6013 local_irq_disable();
6014 cpu = smp_processor_id();
6015 sd = &per_cpu(softnet_data, cpu);
6016 oldsd = &per_cpu(softnet_data, oldcpu);
6017
6018 /* Find end of our completion_queue. */
6019 list_skb = &sd->completion_queue;
6020 while (*list_skb)
6021 list_skb = &(*list_skb)->next;
6022 /* Append completion queue from offline CPU. */
6023 *list_skb = oldsd->completion_queue;
6024 oldsd->completion_queue = NULL;
6025
6026 /* Find end of our output_queue. */
6027 list_net = &sd->output_queue;
6028 while (*list_net)
6029 list_net = &(*list_net)->next_sched;
6030 /* Append output queue from offline CPU. */
6031 *list_net = oldsd->output_queue;
6032 oldsd->output_queue = NULL;
6033
6034 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6035 local_irq_enable();
6036
6037 /* Process offline CPU's input_pkt_queue */
6038 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
6039 netif_rx(skb);
6040
6041 return NOTIFY_OK;
6042}
Linus Torvalds1da177e2005-04-16 15:20:36 -07006043
6044
Herbert Xu7f353bf2007-08-10 15:47:58 -07006045/**
Herbert Xub63365a2008-10-23 01:11:29 -07006046 * netdev_increment_features - increment feature set by one
6047 * @all: current feature set
6048 * @one: new feature set
6049 * @mask: mask feature set
Herbert Xu7f353bf2007-08-10 15:47:58 -07006050 *
6051 * Computes a new feature set after adding a device with feature set
Herbert Xub63365a2008-10-23 01:11:29 -07006052 * @one to the master device with current feature set @all. Will not
6053 * enable anything that is off in @mask. Returns the new feature set.
Herbert Xu7f353bf2007-08-10 15:47:58 -07006054 */
Herbert Xub63365a2008-10-23 01:11:29 -07006055unsigned long netdev_increment_features(unsigned long all, unsigned long one,
6056 unsigned long mask)
Herbert Xu7f353bf2007-08-10 15:47:58 -07006057{
Herbert Xub63365a2008-10-23 01:11:29 -07006058 /* If device needs checksumming, downgrade to it. */
Eric Dumazetd1b19df2009-09-03 01:29:39 -07006059 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
Herbert Xub63365a2008-10-23 01:11:29 -07006060 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
6061 else if (mask & NETIF_F_ALL_CSUM) {
6062 /* If one device supports v4/v6 checksumming, set for all. */
6063 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
6064 !(all & NETIF_F_GEN_CSUM)) {
6065 all &= ~NETIF_F_ALL_CSUM;
6066 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
6067 }
Herbert Xu7f353bf2007-08-10 15:47:58 -07006068
Herbert Xub63365a2008-10-23 01:11:29 -07006069 /* If one device supports hw checksumming, set for all. */
6070 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
6071 all &= ~NETIF_F_ALL_CSUM;
6072 all |= NETIF_F_HW_CSUM;
6073 }
6074 }
Herbert Xu7f353bf2007-08-10 15:47:58 -07006075
Herbert Xub63365a2008-10-23 01:11:29 -07006076 one |= NETIF_F_ALL_CSUM;
Herbert Xu7f353bf2007-08-10 15:47:58 -07006077
Herbert Xub63365a2008-10-23 01:11:29 -07006078 one |= all & NETIF_F_ONE_FOR_ALL;
Sridhar Samudralad9f59502009-10-07 12:24:25 +00006079 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
Herbert Xub63365a2008-10-23 01:11:29 -07006080 all |= one & mask & NETIF_F_ONE_FOR_ALL;
Herbert Xu7f353bf2007-08-10 15:47:58 -07006081
6082 return all;
6083}
Herbert Xub63365a2008-10-23 01:11:29 -07006084EXPORT_SYMBOL(netdev_increment_features);
Herbert Xu7f353bf2007-08-10 15:47:58 -07006085
Pavel Emelyanov30d97d32007-09-16 15:40:33 -07006086static struct hlist_head *netdev_create_hash(void)
6087{
6088 int i;
6089 struct hlist_head *hash;
6090
6091 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6092 if (hash != NULL)
6093 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6094 INIT_HLIST_HEAD(&hash[i]);
6095
6096 return hash;
6097}
6098
Eric W. Biederman881d9662007-09-17 11:56:21 -07006099/* Initialize per network namespace state */
Pavel Emelyanov46650792007-10-08 20:38:39 -07006100static int __net_init netdev_init(struct net *net)
Eric W. Biederman881d9662007-09-17 11:56:21 -07006101{
Eric W. Biederman881d9662007-09-17 11:56:21 -07006102 INIT_LIST_HEAD(&net->dev_base_head);
Eric W. Biederman881d9662007-09-17 11:56:21 -07006103
Pavel Emelyanov30d97d32007-09-16 15:40:33 -07006104 net->dev_name_head = netdev_create_hash();
6105 if (net->dev_name_head == NULL)
6106 goto err_name;
Eric W. Biederman881d9662007-09-17 11:56:21 -07006107
Pavel Emelyanov30d97d32007-09-16 15:40:33 -07006108 net->dev_index_head = netdev_create_hash();
6109 if (net->dev_index_head == NULL)
6110 goto err_idx;
Eric W. Biederman881d9662007-09-17 11:56:21 -07006111
6112 return 0;
Pavel Emelyanov30d97d32007-09-16 15:40:33 -07006113
6114err_idx:
6115 kfree(net->dev_name_head);
6116err_name:
6117 return -ENOMEM;
Eric W. Biederman881d9662007-09-17 11:56:21 -07006118}
6119
Stephen Hemmingerf0db2752008-09-30 02:23:58 -07006120/**
6121 * netdev_drivername - network driver for the device
6122 * @dev: network device
6123 * @buffer: buffer for resulting name
6124 * @len: size of buffer
6125 *
6126 * Determine network driver for device.
6127 */
Stephen Hemmingercf04a4c72008-09-30 02:22:14 -07006128char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
Arjan van de Ven6579e572008-07-21 13:31:48 -07006129{
Stephen Hemmingercf04a4c72008-09-30 02:22:14 -07006130 const struct device_driver *driver;
6131 const struct device *parent;
Arjan van de Ven6579e572008-07-21 13:31:48 -07006132
6133 if (len <= 0 || !buffer)
6134 return buffer;
6135 buffer[0] = 0;
6136
6137 parent = dev->dev.parent;
6138
6139 if (!parent)
6140 return buffer;
6141
6142 driver = parent->driver;
6143 if (driver && driver->name)
6144 strlcpy(buffer, driver->name, len);
6145 return buffer;
6146}
6147
Pavel Emelyanov46650792007-10-08 20:38:39 -07006148static void __net_exit netdev_exit(struct net *net)
Eric W. Biederman881d9662007-09-17 11:56:21 -07006149{
6150 kfree(net->dev_name_head);
6151 kfree(net->dev_index_head);
6152}
6153
Denis V. Lunev022cbae2007-11-13 03:23:50 -08006154static struct pernet_operations __net_initdata netdev_net_ops = {
Eric W. Biederman881d9662007-09-17 11:56:21 -07006155 .init = netdev_init,
6156 .exit = netdev_exit,
6157};
6158
Pavel Emelyanov46650792007-10-08 20:38:39 -07006159static void __net_exit default_device_exit(struct net *net)
Eric W. Biedermance286d32007-09-12 13:53:49 +02006160{
Eric W. Biedermane008b5f2009-11-29 22:25:30 +00006161 struct net_device *dev, *aux;
Eric W. Biedermance286d32007-09-12 13:53:49 +02006162 /*
Eric W. Biedermane008b5f2009-11-29 22:25:30 +00006163 * Push all migratable network devices back to the
Eric W. Biedermance286d32007-09-12 13:53:49 +02006164 * initial network namespace
6165 */
6166 rtnl_lock();
Eric W. Biedermane008b5f2009-11-29 22:25:30 +00006167 for_each_netdev_safe(net, dev, aux) {
Eric W. Biedermance286d32007-09-12 13:53:49 +02006168 int err;
Pavel Emelyanovaca51392008-05-08 01:24:25 -07006169 char fb_name[IFNAMSIZ];
Eric W. Biedermance286d32007-09-12 13:53:49 +02006170
6171 /* Ignore unmoveable devices (i.e. loopback) */
6172 if (dev->features & NETIF_F_NETNS_LOCAL)
6173 continue;
6174
Eric W. Biedermane008b5f2009-11-29 22:25:30 +00006175 /* Leave virtual devices for the generic cleanup */
6176 if (dev->rtnl_link_ops)
6177 continue;
Eric W. Biedermand0c082c2008-11-05 15:59:38 -08006178
Eric W. Biedermance286d32007-09-12 13:53:49 +02006179 /* Push remaing network devices to init_net */
Pavel Emelyanovaca51392008-05-08 01:24:25 -07006180 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6181 err = dev_change_net_namespace(dev, &init_net, fb_name);
Eric W. Biedermance286d32007-09-12 13:53:49 +02006182 if (err) {
Pavel Emelyanovaca51392008-05-08 01:24:25 -07006183 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
Eric W. Biedermance286d32007-09-12 13:53:49 +02006184 __func__, dev->name, err);
Pavel Emelyanovaca51392008-05-08 01:24:25 -07006185 BUG();
Eric W. Biedermance286d32007-09-12 13:53:49 +02006186 }
6187 }
6188 rtnl_unlock();
6189}
6190
Eric W. Biederman04dc7f62009-12-03 02:29:04 +00006191static void __net_exit default_device_exit_batch(struct list_head *net_list)
6192{
6193 /* At exit all network devices most be removed from a network
6194 * namespace. Do this in the reverse order of registeration.
6195 * Do this across as many network namespaces as possible to
6196 * improve batching efficiency.
6197 */
6198 struct net_device *dev;
6199 struct net *net;
6200 LIST_HEAD(dev_kill_list);
6201
6202 rtnl_lock();
6203 list_for_each_entry(net, net_list, exit_list) {
6204 for_each_netdev_reverse(net, dev) {
6205 if (dev->rtnl_link_ops)
6206 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6207 else
6208 unregister_netdevice_queue(dev, &dev_kill_list);
6209 }
6210 }
6211 unregister_netdevice_many(&dev_kill_list);
6212 rtnl_unlock();
6213}
6214
Denis V. Lunev022cbae2007-11-13 03:23:50 -08006215static struct pernet_operations __net_initdata default_device_ops = {
Eric W. Biedermance286d32007-09-12 13:53:49 +02006216 .exit = default_device_exit,
Eric W. Biederman04dc7f62009-12-03 02:29:04 +00006217 .exit_batch = default_device_exit_batch,
Eric W. Biedermance286d32007-09-12 13:53:49 +02006218};
6219
Linus Torvalds1da177e2005-04-16 15:20:36 -07006220/*
6221 * Initialize the DEV module. At boot time this walks the device list and
6222 * unhooks any devices that fail to initialise (normally hardware not
6223 * present) and leaves us with a valid list of present and active devices.
6224 *
6225 */
6226
6227/*
6228 * This is called single threaded during boot, so no need
6229 * to take the rtnl semaphore.
6230 */
6231static int __init net_dev_init(void)
6232{
6233 int i, rc = -ENOMEM;
6234
6235 BUG_ON(!dev_boot_phase);
6236
Linus Torvalds1da177e2005-04-16 15:20:36 -07006237 if (dev_proc_init())
6238 goto out;
6239
Eric W. Biederman8b41d182007-09-26 22:02:53 -07006240 if (netdev_kobject_init())
Linus Torvalds1da177e2005-04-16 15:20:36 -07006241 goto out;
6242
6243 INIT_LIST_HEAD(&ptype_all);
Pavel Emelyanov82d8a8672007-11-26 20:12:58 +08006244 for (i = 0; i < PTYPE_HASH_SIZE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006245 INIT_LIST_HEAD(&ptype_base[i]);
6246
Eric W. Biederman881d9662007-09-17 11:56:21 -07006247 if (register_pernet_subsys(&netdev_net_ops))
6248 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006249
6250 /*
6251 * Initialise the packet receive queues.
6252 */
6253
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07006254 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006255 struct softnet_data *queue;
6256
6257 queue = &per_cpu(softnet_data, i);
6258 skb_queue_head_init(&queue->input_pkt_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006259 queue->completion_queue = NULL;
6260 INIT_LIST_HEAD(&queue->poll_list);
Stephen Hemmingerbea33482007-10-03 16:41:36 -07006261
Eric Dumazetdf334542010-03-24 19:13:54 +00006262#ifdef CONFIG_RPS
Tom Herbert0a9627f2010-03-16 08:03:29 +00006263 queue->csd.func = trigger_softirq;
6264 queue->csd.info = queue;
6265 queue->csd.flags = 0;
Tom Herbert1e94d722010-03-18 17:45:44 -07006266#endif
Tom Herbert0a9627f2010-03-16 08:03:29 +00006267
Stephen Hemmingerbea33482007-10-03 16:41:36 -07006268 queue->backlog.poll = process_backlog;
6269 queue->backlog.weight = weight_p;
Herbert Xud565b0a2008-12-15 23:38:52 -08006270 queue->backlog.gro_list = NULL;
Herbert Xu4ae55442009-02-08 18:00:36 +00006271 queue->backlog.gro_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006272 }
6273
Linus Torvalds1da177e2005-04-16 15:20:36 -07006274 dev_boot_phase = 0;
6275
Eric W. Biederman505d4f72008-11-07 22:54:20 -08006276 /* The loopback device is special if any other network devices
6277 * is present in a network namespace the loopback device must
6278 * be present. Since we now dynamically allocate and free the
6279 * loopback device ensure this invariant is maintained by
6280 * keeping the loopback device as the first device on the
6281 * list of network devices. Ensuring the loopback devices
6282 * is the first device that appears and the last network device
6283 * that disappears.
6284 */
6285 if (register_pernet_device(&loopback_net_ops))
6286 goto out;
6287
6288 if (register_pernet_device(&default_device_ops))
6289 goto out;
6290
Carlos R. Mafra962cf362008-05-15 11:15:37 -03006291 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6292 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006293
6294 hotcpu_notifier(dev_cpu_callback, 0);
6295 dst_init();
6296 dev_mcast_init();
6297 rc = 0;
6298out:
6299 return rc;
6300}
6301
6302subsys_initcall(net_dev_init);
6303
Krishna Kumare88721f2009-02-18 17:55:02 -08006304static int __init initialize_hashrnd(void)
6305{
Tom Herbert0a9627f2010-03-16 08:03:29 +00006306 get_random_bytes(&hashrnd, sizeof(hashrnd));
Krishna Kumare88721f2009-02-18 17:55:02 -08006307 return 0;
6308}
6309
6310late_initcall_sync(initialize_hashrnd);
6311