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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>
82#include <linux/sched.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080083#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#include <linux/string.h>
85#include <linux/mm.h>
86#include <linux/socket.h>
87#include <linux/sockios.h>
88#include <linux/errno.h>
89#include <linux/interrupt.h>
90#include <linux/if_ether.h>
91#include <linux/netdevice.h>
92#include <linux/etherdevice.h>
93#include <linux/notifier.h>
94#include <linux/skbuff.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020095#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070096#include <net/sock.h>
97#include <linux/rtnetlink.h>
98#include <linux/proc_fs.h>
99#include <linux/seq_file.h>
100#include <linux/stat.h>
101#include <linux/if_bridge.h>
Patrick McHardyb863ceb2007-07-14 18:55:06 -0700102#include <linux/if_macvlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103#include <net/dst.h>
104#include <net/pkt_sched.h>
105#include <net/checksum.h>
106#include <linux/highmem.h>
107#include <linux/init.h>
108#include <linux/kmod.h>
109#include <linux/module.h>
110#include <linux/kallsyms.h>
111#include <linux/netpoll.h>
112#include <linux/rcupdate.h>
113#include <linux/delay.h>
Johannes Berg295f4a12007-04-26 20:43:56 -0700114#include <net/wext.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#include <net/iw_handler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116#include <asm/current.h>
Steve Grubb5bdb9882005-12-03 08:39:35 -0500117#include <linux/audit.h>
Chris Leechdb217332006-06-17 21:24:58 -0700118#include <linux/dmaengine.h>
Herbert Xuf6a78bf2006-06-22 02:57:17 -0700119#include <linux/err.h>
David S. Millerc7fa9d12006-08-15 16:34:13 -0700120#include <linux/ctype.h>
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700121#include <linux/if_arp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123/*
124 * The list of packet types we will receive (as opposed to discard)
125 * and the routines to invoke.
126 *
127 * Why 16. Because with 16 the only overlap we get on a hash of the
128 * low nibble of the protocol value is RARP/SNAP/X.25.
129 *
130 * NOTE: That is no longer true with the addition of VLAN tags. Not
131 * sure which should go first, but I bet it won't make much
132 * difference if we are running VLANs. The good news is that
133 * this protocol won't be in the list unless compiled in, so
Stephen Hemminger3041a062006-05-26 13:25:24 -0700134 * the average user (w/out VLANs) will not be adversely affected.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 * --BLG
136 *
137 * 0800 IP
138 * 8100 802.1Q VLAN
139 * 0001 802.3
140 * 0002 AX.25
141 * 0004 802.2
142 * 8035 RARP
143 * 0005 SNAP
144 * 0805 X.25
145 * 0806 ARP
146 * 8137 IPX
147 * 0009 Localtalk
148 * 86DD IPv6
149 */
150
151static DEFINE_SPINLOCK(ptype_lock);
Stephen Hemminger6b2bedc2007-03-12 14:33:50 -0700152static struct list_head ptype_base[16] __read_mostly; /* 16 way hashed list */
153static struct list_head ptype_all __read_mostly; /* Taps */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Chris Leechdb217332006-06-17 21:24:58 -0700155#ifdef CONFIG_NET_DMA
Dan Williamsd379b012007-07-09 11:56:42 -0700156struct net_dma {
157 struct dma_client client;
158 spinlock_t lock;
159 cpumask_t channel_mask;
160 struct dma_chan *channels[NR_CPUS];
161};
162
163static enum dma_state_client
164netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
165 enum dma_state state);
166
167static struct net_dma net_dma = {
168 .client = {
169 .event_callback = netdev_dma_event,
170 },
171};
Chris Leechdb217332006-06-17 21:24:58 -0700172#endif
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174/*
Pavel Emelianov7562f872007-05-03 15:13:45 -0700175 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 * semaphore.
177 *
178 * Pure readers hold dev_base_lock for reading.
179 *
180 * Writers must hold the rtnl semaphore while they loop through the
Pavel Emelianov7562f872007-05-03 15:13:45 -0700181 * dev_base_head list, and hold dev_base_lock for writing when they do the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 * actual updates. This allows pure readers to access the list even
183 * while a writer is preparing to update it.
184 *
185 * To put it another way, dev_base_lock is held for writing only to
186 * protect against pure readers; the rtnl semaphore provides the
187 * protection against other writers.
188 *
189 * See, for example usages, register_netdevice() and
190 * unregister_netdevice(), which must be called with the rtnl
191 * semaphore held.
192 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193DEFINE_RWLOCK(dev_base_lock);
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195EXPORT_SYMBOL(dev_base_lock);
196
197#define NETDEV_HASHBITS 8
Eric W. Biederman881d9662007-09-17 11:56:21 -0700198#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Eric W. Biederman881d9662007-09-17 11:56:21 -0700200static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
202 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
Eric W. Biederman881d9662007-09-17 11:56:21 -0700203 return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204}
205
Eric W. Biederman881d9662007-09-17 11:56:21 -0700206static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
Eric W. Biederman881d9662007-09-17 11:56:21 -0700208 return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209}
210
Eric W. Biedermance286d32007-09-12 13:53:49 +0200211/* Device list insertion */
212static int list_netdevice(struct net_device *dev)
213{
214 struct net *net = dev->nd_net;
215
216 ASSERT_RTNL();
217
218 write_lock_bh(&dev_base_lock);
219 list_add_tail(&dev->dev_list, &net->dev_base_head);
220 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
221 hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
222 write_unlock_bh(&dev_base_lock);
223 return 0;
224}
225
226/* Device list removal */
227static void unlist_netdevice(struct net_device *dev)
228{
229 ASSERT_RTNL();
230
231 /* Unlink dev from the device chain */
232 write_lock_bh(&dev_base_lock);
233 list_del(&dev->dev_list);
234 hlist_del(&dev->name_hlist);
235 hlist_del(&dev->index_hlist);
236 write_unlock_bh(&dev_base_lock);
237}
238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239/*
240 * Our notifier list
241 */
242
Alan Sternf07d5b92006-05-09 15:23:03 -0700243static RAW_NOTIFIER_HEAD(netdev_chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245/*
246 * Device drivers call our routines to queue packets here. We empty the
247 * queue in the local softnet handler.
248 */
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700249
250DEFINE_PER_CPU(struct softnet_data, softnet_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252#ifdef CONFIG_SYSFS
253extern int netdev_sysfs_init(void);
254extern int netdev_register_sysfs(struct net_device *);
255extern void netdev_unregister_sysfs(struct net_device *);
256#else
257#define netdev_sysfs_init() (0)
258#define netdev_register_sysfs(dev) (0)
259#define netdev_unregister_sysfs(dev) do { } while(0)
260#endif
261
Jarek Poplawski723e98b2007-05-15 22:46:18 -0700262#ifdef CONFIG_DEBUG_LOCK_ALLOC
263/*
264 * register_netdevice() inits dev->_xmit_lock and sets lockdep class
265 * according to dev->type
266 */
267static const unsigned short netdev_lock_type[] =
268 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
269 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
270 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
271 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
272 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
273 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
274 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
275 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
276 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
277 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
278 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
279 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
280 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
281 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
282 ARPHRD_NONE};
283
284static const char *netdev_lock_name[] =
285 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
286 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
287 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
288 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
289 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
290 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
291 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
292 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
293 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
294 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
295 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
296 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
297 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
298 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
299 "_xmit_NONE"};
300
301static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
302
303static inline unsigned short netdev_lock_pos(unsigned short dev_type)
304{
305 int i;
306
307 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
308 if (netdev_lock_type[i] == dev_type)
309 return i;
310 /* the last key is used by default */
311 return ARRAY_SIZE(netdev_lock_type) - 1;
312}
313
314static inline void netdev_set_lockdep_class(spinlock_t *lock,
315 unsigned short dev_type)
316{
317 int i;
318
319 i = netdev_lock_pos(dev_type);
320 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
321 netdev_lock_name[i]);
322}
323#else
324static inline void netdev_set_lockdep_class(spinlock_t *lock,
325 unsigned short dev_type)
326{
327}
328#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330/*******************************************************************************
331
332 Protocol management and registration routines
333
334*******************************************************************************/
335
336/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 * Add a protocol ID to the list. Now that the input handler is
338 * smarter we can dispense with all the messy stuff that used to be
339 * here.
340 *
341 * BEWARE!!! Protocol handlers, mangling input packets,
342 * MUST BE last in hash buckets and checking protocol handlers
343 * MUST start from promiscuous ptype_all chain in net_bh.
344 * It is true now, do not change it.
345 * Explanation follows: if protocol handler, mangling packet, will
346 * be the first on list, it is not able to sense, that packet
347 * is cloned and should be copied-on-write, so that it will
348 * change it and subsequent readers will get broken packet.
349 * --ANK (980803)
350 */
351
352/**
353 * dev_add_pack - add packet handler
354 * @pt: packet type declaration
355 *
356 * Add a protocol handler to the networking stack. The passed &packet_type
357 * is linked into kernel lists and may not be freed until it has been
358 * removed from the kernel lists.
359 *
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900360 * This call does not sleep therefore it can not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 * guarantee all CPU's that are in middle of receiving packets
362 * will see the new packet type (until the next received packet).
363 */
364
365void dev_add_pack(struct packet_type *pt)
366{
367 int hash;
368
369 spin_lock_bh(&ptype_lock);
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -0700370 if (pt->type == htons(ETH_P_ALL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 list_add_rcu(&pt->list, &ptype_all);
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -0700372 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 hash = ntohs(pt->type) & 15;
374 list_add_rcu(&pt->list, &ptype_base[hash]);
375 }
376 spin_unlock_bh(&ptype_lock);
377}
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379/**
380 * __dev_remove_pack - remove packet handler
381 * @pt: packet type declaration
382 *
383 * Remove a protocol handler that was previously added to the kernel
384 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
385 * from the kernel lists and can be freed or reused once this function
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900386 * returns.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 *
388 * The packet type might still be in use by receivers
389 * and must not be freed until after all the CPU's have gone
390 * through a quiescent state.
391 */
392void __dev_remove_pack(struct packet_type *pt)
393{
394 struct list_head *head;
395 struct packet_type *pt1;
396
397 spin_lock_bh(&ptype_lock);
398
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -0700399 if (pt->type == htons(ETH_P_ALL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 head = &ptype_all;
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -0700401 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 head = &ptype_base[ntohs(pt->type) & 15];
403
404 list_for_each_entry(pt1, head, list) {
405 if (pt == pt1) {
406 list_del_rcu(&pt->list);
407 goto out;
408 }
409 }
410
411 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
412out:
413 spin_unlock_bh(&ptype_lock);
414}
415/**
416 * dev_remove_pack - remove packet handler
417 * @pt: packet type declaration
418 *
419 * Remove a protocol handler that was previously added to the kernel
420 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
421 * from the kernel lists and can be freed or reused once this function
422 * returns.
423 *
424 * This call sleeps to guarantee that no CPU is looking at the packet
425 * type after return.
426 */
427void dev_remove_pack(struct packet_type *pt)
428{
429 __dev_remove_pack(pt);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 synchronize_net();
432}
433
434/******************************************************************************
435
436 Device Boot-time Settings Routines
437
438*******************************************************************************/
439
440/* Boot time configuration table */
441static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
442
443/**
444 * netdev_boot_setup_add - add new setup entry
445 * @name: name of the device
446 * @map: configured settings for the device
447 *
448 * Adds new setup entry to the dev_boot_setup list. The function
449 * returns 0 on error and 1 on success. This is a generic routine to
450 * all netdevices.
451 */
452static int netdev_boot_setup_add(char *name, struct ifmap *map)
453{
454 struct netdev_boot_setup *s;
455 int i;
456
457 s = dev_boot_setup;
458 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
459 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
460 memset(s[i].name, 0, sizeof(s[i].name));
461 strcpy(s[i].name, name);
462 memcpy(&s[i].map, map, sizeof(s[i].map));
463 break;
464 }
465 }
466
467 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
468}
469
470/**
471 * netdev_boot_setup_check - check boot time settings
472 * @dev: the netdevice
473 *
474 * Check boot time settings for the device.
475 * The found settings are set for the device to be used
476 * later in the device probing.
477 * Returns 0 if no settings found, 1 if they are.
478 */
479int netdev_boot_setup_check(struct net_device *dev)
480{
481 struct netdev_boot_setup *s = dev_boot_setup;
482 int i;
483
484 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
485 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
486 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
487 dev->irq = s[i].map.irq;
488 dev->base_addr = s[i].map.base_addr;
489 dev->mem_start = s[i].map.mem_start;
490 dev->mem_end = s[i].map.mem_end;
491 return 1;
492 }
493 }
494 return 0;
495}
496
497
498/**
499 * netdev_boot_base - get address from boot time settings
500 * @prefix: prefix for network device
501 * @unit: id for network device
502 *
503 * Check boot time settings for the base address of device.
504 * The found settings are set for the device to be used
505 * later in the device probing.
506 * Returns 0 if no settings found.
507 */
508unsigned long netdev_boot_base(const char *prefix, int unit)
509{
510 const struct netdev_boot_setup *s = dev_boot_setup;
511 char name[IFNAMSIZ];
512 int i;
513
514 sprintf(name, "%s%d", prefix, unit);
515
516 /*
517 * If device already registered then return base of 1
518 * to indicate not to probe for this interface
519 */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700520 if (__dev_get_by_name(&init_net, name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 return 1;
522
523 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
524 if (!strcmp(name, s[i].name))
525 return s[i].map.base_addr;
526 return 0;
527}
528
529/*
530 * Saves at boot time configured settings for any netdevice.
531 */
532int __init netdev_boot_setup(char *str)
533{
534 int ints[5];
535 struct ifmap map;
536
537 str = get_options(str, ARRAY_SIZE(ints), ints);
538 if (!str || !*str)
539 return 0;
540
541 /* Save settings */
542 memset(&map, 0, sizeof(map));
543 if (ints[0] > 0)
544 map.irq = ints[1];
545 if (ints[0] > 1)
546 map.base_addr = ints[2];
547 if (ints[0] > 2)
548 map.mem_start = ints[3];
549 if (ints[0] > 3)
550 map.mem_end = ints[4];
551
552 /* Add new entry to the list */
553 return netdev_boot_setup_add(str, &map);
554}
555
556__setup("netdev=", netdev_boot_setup);
557
558/*******************************************************************************
559
560 Device Interface Subroutines
561
562*******************************************************************************/
563
564/**
565 * __dev_get_by_name - find a device by its name
566 * @name: name to find
567 *
568 * Find an interface by name. Must be called under RTNL semaphore
569 * or @dev_base_lock. If the name is found a pointer to the device
570 * is returned. If the name is not found then %NULL is returned. The
571 * reference counters are not incremented so the caller must be
572 * careful with locks.
573 */
574
Eric W. Biederman881d9662007-09-17 11:56:21 -0700575struct net_device *__dev_get_by_name(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576{
577 struct hlist_node *p;
578
Eric W. Biederman881d9662007-09-17 11:56:21 -0700579 hlist_for_each(p, dev_name_hash(net, name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 struct net_device *dev
581 = hlist_entry(p, struct net_device, name_hlist);
582 if (!strncmp(dev->name, name, IFNAMSIZ))
583 return dev;
584 }
585 return NULL;
586}
587
588/**
589 * dev_get_by_name - find a device by its name
590 * @name: name to find
591 *
592 * Find an interface by name. This can be called from any
593 * context and does its own locking. The returned handle has
594 * the usage count incremented and the caller must use dev_put() to
595 * release it when it is no longer needed. %NULL is returned if no
596 * matching device is found.
597 */
598
Eric W. Biederman881d9662007-09-17 11:56:21 -0700599struct net_device *dev_get_by_name(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
601 struct net_device *dev;
602
603 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700604 dev = __dev_get_by_name(net, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (dev)
606 dev_hold(dev);
607 read_unlock(&dev_base_lock);
608 return dev;
609}
610
611/**
612 * __dev_get_by_index - find a device by its ifindex
613 * @ifindex: index of device
614 *
615 * Search for an interface by index. Returns %NULL if the device
616 * is not found or a pointer to the device. The device has not
617 * had its reference counter increased so the caller must be careful
618 * about locking. The caller must hold either the RTNL semaphore
619 * or @dev_base_lock.
620 */
621
Eric W. Biederman881d9662007-09-17 11:56:21 -0700622struct net_device *__dev_get_by_index(struct net *net, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623{
624 struct hlist_node *p;
625
Eric W. Biederman881d9662007-09-17 11:56:21 -0700626 hlist_for_each(p, dev_index_hash(net, ifindex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 struct net_device *dev
628 = hlist_entry(p, struct net_device, index_hlist);
629 if (dev->ifindex == ifindex)
630 return dev;
631 }
632 return NULL;
633}
634
635
636/**
637 * dev_get_by_index - find a device by its ifindex
638 * @ifindex: index of device
639 *
640 * Search for an interface by index. Returns NULL if the device
641 * is not found or a pointer to the device. The device returned has
642 * had a reference added and the pointer is safe until the user calls
643 * dev_put to indicate they have finished with it.
644 */
645
Eric W. Biederman881d9662007-09-17 11:56:21 -0700646struct net_device *dev_get_by_index(struct net *net, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647{
648 struct net_device *dev;
649
650 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700651 dev = __dev_get_by_index(net, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 if (dev)
653 dev_hold(dev);
654 read_unlock(&dev_base_lock);
655 return dev;
656}
657
658/**
659 * dev_getbyhwaddr - find a device by its hardware address
660 * @type: media type of device
661 * @ha: hardware address
662 *
663 * Search for an interface by MAC address. Returns NULL if the device
664 * is not found or a pointer to the device. The caller must hold the
665 * rtnl semaphore. The returned device has not had its ref count increased
666 * and the caller must therefore be careful about locking
667 *
668 * BUGS:
669 * If the API was consistent this would be __dev_get_by_hwaddr
670 */
671
Eric W. Biederman881d9662007-09-17 11:56:21 -0700672struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673{
674 struct net_device *dev;
675
676 ASSERT_RTNL();
677
Eric W. Biederman881d9662007-09-17 11:56:21 -0700678 for_each_netdev(&init_net, dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 if (dev->type == type &&
680 !memcmp(dev->dev_addr, ha, dev->addr_len))
Pavel Emelianov7562f872007-05-03 15:13:45 -0700681 return dev;
682
683 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684}
685
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300686EXPORT_SYMBOL(dev_getbyhwaddr);
687
Eric W. Biederman881d9662007-09-17 11:56:21 -0700688struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
Patrick McHardy4e9cac22007-05-03 03:28:13 -0700689{
690 struct net_device *dev;
691
692 ASSERT_RTNL();
Eric W. Biederman881d9662007-09-17 11:56:21 -0700693 for_each_netdev(net, dev)
Patrick McHardy4e9cac22007-05-03 03:28:13 -0700694 if (dev->type == type)
Pavel Emelianov7562f872007-05-03 15:13:45 -0700695 return dev;
696
697 return NULL;
Patrick McHardy4e9cac22007-05-03 03:28:13 -0700698}
699
700EXPORT_SYMBOL(__dev_getfirstbyhwtype);
701
Eric W. Biederman881d9662007-09-17 11:56:21 -0700702struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
704 struct net_device *dev;
705
706 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -0700707 dev = __dev_getfirstbyhwtype(net, type);
Patrick McHardy4e9cac22007-05-03 03:28:13 -0700708 if (dev)
709 dev_hold(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 rtnl_unlock();
711 return dev;
712}
713
714EXPORT_SYMBOL(dev_getfirstbyhwtype);
715
716/**
717 * dev_get_by_flags - find any device with given flags
718 * @if_flags: IFF_* values
719 * @mask: bitmask of bits in if_flags to check
720 *
721 * Search for any interface with the given flags. Returns NULL if a device
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900722 * is not found or a pointer to the device. The device returned has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 * had a reference added and the pointer is safe until the user calls
724 * dev_put to indicate they have finished with it.
725 */
726
Eric W. Biederman881d9662007-09-17 11:56:21 -0700727struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
Pavel Emelianov7562f872007-05-03 15:13:45 -0700729 struct net_device *dev, *ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
Pavel Emelianov7562f872007-05-03 15:13:45 -0700731 ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700733 for_each_netdev(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 if (((dev->flags ^ if_flags) & mask) == 0) {
735 dev_hold(dev);
Pavel Emelianov7562f872007-05-03 15:13:45 -0700736 ret = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 break;
738 }
739 }
740 read_unlock(&dev_base_lock);
Pavel Emelianov7562f872007-05-03 15:13:45 -0700741 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742}
743
744/**
745 * dev_valid_name - check if name is okay for network device
746 * @name: name string
747 *
748 * Network device names need to be valid file names to
David S. Millerc7fa9d12006-08-15 16:34:13 -0700749 * to allow sysfs to work. We also disallow any kind of
750 * whitespace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 */
Mitch Williamsc2373ee2005-11-09 10:34:45 -0800752int dev_valid_name(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753{
David S. Millerc7fa9d12006-08-15 16:34:13 -0700754 if (*name == '\0')
755 return 0;
Stephen Hemmingerb6fe17d2006-08-29 17:06:13 -0700756 if (strlen(name) >= IFNAMSIZ)
757 return 0;
David S. Millerc7fa9d12006-08-15 16:34:13 -0700758 if (!strcmp(name, ".") || !strcmp(name, ".."))
759 return 0;
760
761 while (*name) {
762 if (*name == '/' || isspace(*name))
763 return 0;
764 name++;
765 }
766 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767}
768
769/**
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200770 * __dev_alloc_name - allocate a name for a device
771 * @net: network namespace to allocate the device name in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 * @name: name format string
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200773 * @buf: scratch buffer and result name string
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 *
775 * Passed a format string - eg "lt%d" it will try and find a suitable
Stephen Hemminger3041a062006-05-26 13:25:24 -0700776 * id. It scans list of devices to build up a free map, then chooses
777 * the first empty slot. The caller must hold the dev_base or rtnl lock
778 * while allocating the name and adding the device in order to avoid
779 * duplicates.
780 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
781 * Returns the number of the unit assigned or a negative errno code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 */
783
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200784static int __dev_alloc_name(struct net *net, const char *name, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785{
786 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 const char *p;
788 const int max_netdevices = 8*PAGE_SIZE;
789 long *inuse;
790 struct net_device *d;
791
792 p = strnchr(name, IFNAMSIZ-1, '%');
793 if (p) {
794 /*
795 * Verify the string as this thing may have come from
796 * the user. There must be either one "%d" and no other "%"
797 * characters.
798 */
799 if (p[1] != 'd' || strchr(p + 2, '%'))
800 return -EINVAL;
801
802 /* Use one page as a bit array of possible slots */
803 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
804 if (!inuse)
805 return -ENOMEM;
806
Eric W. Biederman881d9662007-09-17 11:56:21 -0700807 for_each_netdev(net, d) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 if (!sscanf(d->name, name, &i))
809 continue;
810 if (i < 0 || i >= max_netdevices)
811 continue;
812
813 /* avoid cases where sscanf is not exact inverse of printf */
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200814 snprintf(buf, IFNAMSIZ, name, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 if (!strncmp(buf, d->name, IFNAMSIZ))
816 set_bit(i, inuse);
817 }
818
819 i = find_first_zero_bit(inuse, max_netdevices);
820 free_page((unsigned long) inuse);
821 }
822
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200823 snprintf(buf, IFNAMSIZ, name, i);
824 if (!__dev_get_by_name(net, buf))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
827 /* It is possible to run out of possible slots
828 * when the name is long and there isn't enough space left
829 * for the digits, or if all bits are used.
830 */
831 return -ENFILE;
832}
833
Eric W. Biedermanb267b172007-09-12 13:48:45 +0200834/**
835 * dev_alloc_name - allocate a name for a device
836 * @dev: device
837 * @name: name format string
838 *
839 * Passed a format string - eg "lt%d" it will try and find a suitable
840 * id. It scans list of devices to build up a free map, then chooses
841 * the first empty slot. The caller must hold the dev_base or rtnl lock
842 * while allocating the name and adding the device in order to avoid
843 * duplicates.
844 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
845 * Returns the number of the unit assigned or a negative errno code.
846 */
847
848int dev_alloc_name(struct net_device *dev, const char *name)
849{
850 char buf[IFNAMSIZ];
851 struct net *net;
852 int ret;
853
854 BUG_ON(!dev->nd_net);
855 net = dev->nd_net;
856 ret = __dev_alloc_name(net, name, buf);
857 if (ret >= 0)
858 strlcpy(dev->name, buf, IFNAMSIZ);
859 return ret;
860}
861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
863/**
864 * dev_change_name - change name of a device
865 * @dev: device
866 * @newname: name (or format string) must be at least IFNAMSIZ
867 *
868 * Change name of a device, can pass format strings "eth%d".
869 * for wildcarding.
870 */
871int dev_change_name(struct net_device *dev, char *newname)
872{
Herbert Xufcc5a032007-07-30 17:03:38 -0700873 char oldname[IFNAMSIZ];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 int err = 0;
Herbert Xufcc5a032007-07-30 17:03:38 -0700875 int ret;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700876 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
878 ASSERT_RTNL();
Eric W. Biederman881d9662007-09-17 11:56:21 -0700879 BUG_ON(!dev->nd_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
Eric W. Biederman881d9662007-09-17 11:56:21 -0700881 net = dev->nd_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 if (dev->flags & IFF_UP)
883 return -EBUSY;
884
885 if (!dev_valid_name(newname))
886 return -EINVAL;
887
Herbert Xufcc5a032007-07-30 17:03:38 -0700888 memcpy(oldname, dev->name, IFNAMSIZ);
889
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 if (strchr(newname, '%')) {
891 err = dev_alloc_name(dev, newname);
892 if (err < 0)
893 return err;
894 strcpy(newname, dev->name);
895 }
Eric W. Biederman881d9662007-09-17 11:56:21 -0700896 else if (__dev_get_by_name(net, newname))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 return -EEXIST;
898 else
899 strlcpy(dev->name, newname, IFNAMSIZ);
900
Herbert Xufcc5a032007-07-30 17:03:38 -0700901rollback:
Eric W. Biederman92749822007-04-03 00:07:30 -0600902 device_rename(&dev->dev, dev->name);
Herbert Xu7f988ea2007-07-30 16:35:46 -0700903
904 write_lock_bh(&dev_base_lock);
Eric W. Biederman92749822007-04-03 00:07:30 -0600905 hlist_del(&dev->name_hlist);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700906 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
Herbert Xu7f988ea2007-07-30 16:35:46 -0700907 write_unlock_bh(&dev_base_lock);
908
Herbert Xufcc5a032007-07-30 17:03:38 -0700909 ret = raw_notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
910 ret = notifier_to_errno(ret);
911
912 if (ret) {
913 if (err) {
914 printk(KERN_ERR
915 "%s: name change rollback failed: %d.\n",
916 dev->name, ret);
917 } else {
918 err = ret;
919 memcpy(dev->name, oldname, IFNAMSIZ);
920 goto rollback;
921 }
922 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
924 return err;
925}
926
927/**
Stephen Hemminger3041a062006-05-26 13:25:24 -0700928 * netdev_features_change - device changes features
Stephen Hemmingerd8a33ac2005-05-29 14:13:47 -0700929 * @dev: device to cause notification
930 *
931 * Called to indicate a device has changed features.
932 */
933void netdev_features_change(struct net_device *dev)
934{
Alan Sternf07d5b92006-05-09 15:23:03 -0700935 raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
Stephen Hemmingerd8a33ac2005-05-29 14:13:47 -0700936}
937EXPORT_SYMBOL(netdev_features_change);
938
939/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 * netdev_state_change - device changes state
941 * @dev: device to cause notification
942 *
943 * Called to indicate a device has changed state. This function calls
944 * the notifier chains for netdev_chain and sends a NEWLINK message
945 * to the routing socket.
946 */
947void netdev_state_change(struct net_device *dev)
948{
949 if (dev->flags & IFF_UP) {
Alan Sternf07d5b92006-05-09 15:23:03 -0700950 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -0800951 NETDEV_CHANGE, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
953 }
954}
955
956/**
957 * dev_load - load a network module
958 * @name: name of interface
959 *
960 * If a network interface is not present and the process has suitable
961 * privileges this function loads the module. If module loading is not
962 * available in this kernel then it becomes a nop.
963 */
964
Eric W. Biederman881d9662007-09-17 11:56:21 -0700965void dev_load(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966{
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900967 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
969 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700970 dev = __dev_get_by_name(net, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 read_unlock(&dev_base_lock);
972
973 if (!dev && capable(CAP_SYS_MODULE))
974 request_module("%s", name);
975}
976
977static int default_rebuild_header(struct sk_buff *skb)
978{
979 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
980 skb->dev ? skb->dev->name : "NULL!!!");
981 kfree_skb(skb);
982 return 1;
983}
984
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985/**
986 * dev_open - prepare an interface for use.
987 * @dev: device to open
988 *
989 * Takes a device from down to up state. The device's private open
990 * function is invoked and then the multicast lists are loaded. Finally
991 * the device is moved into the up state and a %NETDEV_UP message is
992 * sent to the netdev notifier chain.
993 *
994 * Calling this function on an active interface is a nop. On a failure
995 * a negative errno code is returned.
996 */
997int dev_open(struct net_device *dev)
998{
999 int ret = 0;
1000
1001 /*
1002 * Is it already up?
1003 */
1004
1005 if (dev->flags & IFF_UP)
1006 return 0;
1007
1008 /*
1009 * Is it even present?
1010 */
1011 if (!netif_device_present(dev))
1012 return -ENODEV;
1013
1014 /*
1015 * Call device private open method
1016 */
1017 set_bit(__LINK_STATE_START, &dev->state);
1018 if (dev->open) {
1019 ret = dev->open(dev);
1020 if (ret)
1021 clear_bit(__LINK_STATE_START, &dev->state);
1022 }
1023
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001024 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 * If it went open OK then:
1026 */
1027
1028 if (!ret) {
1029 /*
1030 * Set the flags.
1031 */
1032 dev->flags |= IFF_UP;
1033
1034 /*
1035 * Initialize multicasting status
1036 */
Patrick McHardy4417da62007-06-27 01:28:10 -07001037 dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
1039 /*
1040 * Wakeup transmit queue engine
1041 */
1042 dev_activate(dev);
1043
1044 /*
1045 * ... and announce new interface.
1046 */
Alan Sternf07d5b92006-05-09 15:23:03 -07001047 raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 }
1049 return ret;
1050}
1051
1052/**
1053 * dev_close - shutdown an interface.
1054 * @dev: device to shutdown
1055 *
1056 * This function moves an active device into down state. A
1057 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1058 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1059 * chain.
1060 */
1061int dev_close(struct net_device *dev)
1062{
1063 if (!(dev->flags & IFF_UP))
1064 return 0;
1065
1066 /*
1067 * Tell people we are going down, so that they can
1068 * prepare to death, when device is still operating.
1069 */
Alan Sternf07d5b92006-05-09 15:23:03 -07001070 raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
1072 dev_deactivate(dev);
1073
1074 clear_bit(__LINK_STATE_START, &dev->state);
1075
1076 /* Synchronize to scheduled poll. We cannot touch poll list,
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001077 * it can be even on different cpu. So just clear netif_running().
1078 *
1079 * dev->stop() will invoke napi_disable() on all of it's
1080 * napi_struct instances on this device.
1081 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 smp_mb__after_clear_bit(); /* Commit netif_running(). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
1084 /*
1085 * Call the device specific close. This cannot fail.
1086 * Only if device is UP
1087 *
1088 * We allow it to be called even after a DETACH hot-plug
1089 * event.
1090 */
1091 if (dev->stop)
1092 dev->stop(dev);
1093
1094 /*
1095 * Device is now down.
1096 */
1097
1098 dev->flags &= ~IFF_UP;
1099
1100 /*
1101 * Tell people we are down
1102 */
Alan Sternf07d5b92006-05-09 15:23:03 -07001103 raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104
1105 return 0;
1106}
1107
1108
Eric W. Biederman881d9662007-09-17 11:56:21 -07001109static int dev_boot_phase = 1;
1110
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111/*
1112 * Device change register/unregister. These are not inline or static
1113 * as we export them to the world.
1114 */
1115
1116/**
1117 * register_netdevice_notifier - register a network notifier block
1118 * @nb: notifier
1119 *
1120 * Register a notifier to be called when network device events occur.
1121 * The notifier passed is linked into the kernel structures and must
1122 * not be reused until it has been unregistered. A negative errno code
1123 * is returned on a failure.
1124 *
1125 * When registered all registration and up events are replayed
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001126 * to the new notifier to allow device to have a race free
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 * view of the network device list.
1128 */
1129
1130int register_netdevice_notifier(struct notifier_block *nb)
1131{
1132 struct net_device *dev;
Herbert Xufcc5a032007-07-30 17:03:38 -07001133 struct net_device *last;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001134 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 int err;
1136
1137 rtnl_lock();
Alan Sternf07d5b92006-05-09 15:23:03 -07001138 err = raw_notifier_chain_register(&netdev_chain, nb);
Herbert Xufcc5a032007-07-30 17:03:38 -07001139 if (err)
1140 goto unlock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001141 if (dev_boot_phase)
1142 goto unlock;
1143 for_each_net(net) {
1144 for_each_netdev(net, dev) {
1145 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1146 err = notifier_to_errno(err);
1147 if (err)
1148 goto rollback;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
Eric W. Biederman881d9662007-09-17 11:56:21 -07001150 if (!(dev->flags & IFF_UP))
1151 continue;
Herbert Xufcc5a032007-07-30 17:03:38 -07001152
Eric W. Biederman881d9662007-09-17 11:56:21 -07001153 nb->notifier_call(nb, NETDEV_UP, dev);
1154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 }
Herbert Xufcc5a032007-07-30 17:03:38 -07001156
1157unlock:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 rtnl_unlock();
1159 return err;
Herbert Xufcc5a032007-07-30 17:03:38 -07001160
1161rollback:
1162 last = dev;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001163 for_each_net(net) {
1164 for_each_netdev(net, dev) {
1165 if (dev == last)
1166 break;
Herbert Xufcc5a032007-07-30 17:03:38 -07001167
Eric W. Biederman881d9662007-09-17 11:56:21 -07001168 if (dev->flags & IFF_UP) {
1169 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1170 nb->notifier_call(nb, NETDEV_DOWN, dev);
1171 }
1172 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
Herbert Xufcc5a032007-07-30 17:03:38 -07001173 }
Herbert Xufcc5a032007-07-30 17:03:38 -07001174 }
1175 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176}
1177
1178/**
1179 * unregister_netdevice_notifier - unregister a network notifier block
1180 * @nb: notifier
1181 *
1182 * Unregister a notifier previously registered by
1183 * register_netdevice_notifier(). The notifier is unlinked into the
1184 * kernel structures and may then be reused. A negative errno code
1185 * is returned on a failure.
1186 */
1187
1188int unregister_netdevice_notifier(struct notifier_block *nb)
1189{
Herbert Xu9f514952006-03-25 01:24:25 -08001190 int err;
1191
1192 rtnl_lock();
Alan Sternf07d5b92006-05-09 15:23:03 -07001193 err = raw_notifier_chain_unregister(&netdev_chain, nb);
Herbert Xu9f514952006-03-25 01:24:25 -08001194 rtnl_unlock();
1195 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196}
1197
1198/**
1199 * call_netdevice_notifiers - call all network notifier blocks
1200 * @val: value passed unmodified to notifier function
1201 * @v: pointer passed unmodified to notifier function
1202 *
1203 * Call all network notifier blocks. Parameters and return value
Alan Sternf07d5b92006-05-09 15:23:03 -07001204 * are as for raw_notifier_call_chain().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 */
1206
1207int call_netdevice_notifiers(unsigned long val, void *v)
1208{
Alan Sternf07d5b92006-05-09 15:23:03 -07001209 return raw_notifier_call_chain(&netdev_chain, val, v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210}
1211
1212/* When > 0 there are consumers of rx skb time stamps */
1213static atomic_t netstamp_needed = ATOMIC_INIT(0);
1214
1215void net_enable_timestamp(void)
1216{
1217 atomic_inc(&netstamp_needed);
1218}
1219
1220void net_disable_timestamp(void)
1221{
1222 atomic_dec(&netstamp_needed);
1223}
1224
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001225static inline void net_timestamp(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226{
1227 if (atomic_read(&netstamp_needed))
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001228 __net_timestamp(skb);
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -07001229 else
1230 skb->tstamp.tv64 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231}
1232
1233/*
1234 * Support routine. Sends outgoing frames to any network
1235 * taps currently in use.
1236 */
1237
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001238static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239{
1240 struct packet_type *ptype;
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001241
1242 net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243
1244 rcu_read_lock();
1245 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1246 /* Never send packets back to the socket
1247 * they originated from - MvS (miquels@drinkel.ow.org)
1248 */
1249 if ((ptype->dev == dev || !ptype->dev) &&
1250 (ptype->af_packet_priv == NULL ||
1251 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1252 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1253 if (!skb2)
1254 break;
1255
1256 /* skb->nh should be correctly
1257 set by sender, so that the second statement is
1258 just protection against buggy protocols.
1259 */
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07001260 skb_reset_mac_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001262 if (skb_network_header(skb2) < skb2->data ||
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001263 skb2->network_header > skb2->tail) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 if (net_ratelimit())
1265 printk(KERN_CRIT "protocol %04x is "
1266 "buggy, dev %s\n",
1267 skb2->protocol, dev->name);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -07001268 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 }
1270
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001271 skb2->transport_header = skb2->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 skb2->pkt_type = PACKET_OUTGOING;
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001273 ptype->func(skb2, skb->dev, ptype, skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 }
1275 }
1276 rcu_read_unlock();
1277}
1278
Denis Vlasenko56079432006-03-29 15:57:29 -08001279
1280void __netif_schedule(struct net_device *dev)
1281{
1282 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1283 unsigned long flags;
1284 struct softnet_data *sd;
1285
1286 local_irq_save(flags);
1287 sd = &__get_cpu_var(softnet_data);
1288 dev->next_sched = sd->output_queue;
1289 sd->output_queue = dev;
1290 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1291 local_irq_restore(flags);
1292 }
1293}
1294EXPORT_SYMBOL(__netif_schedule);
1295
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001296void dev_kfree_skb_irq(struct sk_buff *skb)
Denis Vlasenko56079432006-03-29 15:57:29 -08001297{
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001298 if (atomic_dec_and_test(&skb->users)) {
1299 struct softnet_data *sd;
1300 unsigned long flags;
Denis Vlasenko56079432006-03-29 15:57:29 -08001301
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001302 local_irq_save(flags);
1303 sd = &__get_cpu_var(softnet_data);
1304 skb->next = sd->completion_queue;
1305 sd->completion_queue = skb;
1306 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1307 local_irq_restore(flags);
1308 }
Denis Vlasenko56079432006-03-29 15:57:29 -08001309}
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001310EXPORT_SYMBOL(dev_kfree_skb_irq);
Denis Vlasenko56079432006-03-29 15:57:29 -08001311
1312void dev_kfree_skb_any(struct sk_buff *skb)
1313{
1314 if (in_irq() || irqs_disabled())
1315 dev_kfree_skb_irq(skb);
1316 else
1317 dev_kfree_skb(skb);
1318}
1319EXPORT_SYMBOL(dev_kfree_skb_any);
1320
1321
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001322/**
1323 * netif_device_detach - mark device as removed
1324 * @dev: network device
1325 *
1326 * Mark device as removed from system and therefore no longer available.
1327 */
Denis Vlasenko56079432006-03-29 15:57:29 -08001328void netif_device_detach(struct net_device *dev)
1329{
1330 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1331 netif_running(dev)) {
1332 netif_stop_queue(dev);
1333 }
1334}
1335EXPORT_SYMBOL(netif_device_detach);
1336
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001337/**
1338 * netif_device_attach - mark device as attached
1339 * @dev: network device
1340 *
1341 * Mark device as attached from system and restart if needed.
1342 */
Denis Vlasenko56079432006-03-29 15:57:29 -08001343void netif_device_attach(struct net_device *dev)
1344{
1345 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1346 netif_running(dev)) {
1347 netif_wake_queue(dev);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001348 __netdev_watchdog_up(dev);
Denis Vlasenko56079432006-03-29 15:57:29 -08001349 }
1350}
1351EXPORT_SYMBOL(netif_device_attach);
1352
1353
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354/*
1355 * Invalidate hardware checksum when packet is to be mangled, and
1356 * complete checksum manually on outgoing path.
1357 */
Patrick McHardy84fa7932006-08-29 16:44:56 -07001358int skb_checksum_help(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359{
Al Virod3bc23e2006-11-14 21:24:49 -08001360 __wsum csum;
Herbert Xu663ead32007-04-09 11:59:07 -07001361 int ret = 0, offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
Patrick McHardy84fa7932006-08-29 16:44:56 -07001363 if (skb->ip_summed == CHECKSUM_COMPLETE)
Herbert Xua430a432006-07-08 13:34:56 -07001364 goto out_set_summed;
1365
1366 if (unlikely(skb_shinfo(skb)->gso_size)) {
Herbert Xua430a432006-07-08 13:34:56 -07001367 /* Let GSO fix up the checksum. */
1368 goto out_set_summed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 }
1370
1371 if (skb_cloned(skb)) {
1372 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1373 if (ret)
1374 goto out;
1375 }
1376
Herbert Xu663ead32007-04-09 11:59:07 -07001377 offset = skb->csum_start - skb_headroom(skb);
Kris Katterjohn09a62662006-01-08 22:24:28 -08001378 BUG_ON(offset > (int)skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1380
Herbert Xu663ead32007-04-09 11:59:07 -07001381 offset = skb_headlen(skb) - offset;
Kris Katterjohn09a62662006-01-08 22:24:28 -08001382 BUG_ON(offset <= 0);
Al Viroff1dcad2006-11-20 18:07:29 -08001383 BUG_ON(skb->csum_offset + 2 > offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
Herbert Xu663ead32007-04-09 11:59:07 -07001385 *(__sum16 *)(skb->head + skb->csum_start + skb->csum_offset) =
1386 csum_fold(csum);
Herbert Xua430a432006-07-08 13:34:56 -07001387out_set_summed:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 skb->ip_summed = CHECKSUM_NONE;
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001389out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 return ret;
1391}
1392
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001393/**
1394 * skb_gso_segment - Perform segmentation on skb.
1395 * @skb: buffer to segment
Herbert Xu576a30e2006-06-27 13:22:38 -07001396 * @features: features for the output path (see dev->features)
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001397 *
1398 * This function segments the given skb and returns a list of segments.
Herbert Xu576a30e2006-06-27 13:22:38 -07001399 *
1400 * It may return NULL if the skb requires no segmentation. This is
1401 * only possible when GSO is used for verifying header integrity.
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001402 */
Herbert Xu576a30e2006-06-27 13:22:38 -07001403struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001404{
1405 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1406 struct packet_type *ptype;
Al Viro252e3342006-11-14 20:48:11 -08001407 __be16 type = skb->protocol;
Herbert Xua430a432006-07-08 13:34:56 -07001408 int err;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001409
1410 BUG_ON(skb_shinfo(skb)->frag_list);
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001411
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07001412 skb_reset_mac_header(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07001413 skb->mac_len = skb->network_header - skb->mac_header;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001414 __skb_pull(skb, skb->mac_len);
1415
Herbert Xuf9d106a2007-04-23 22:36:13 -07001416 if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
Herbert Xua430a432006-07-08 13:34:56 -07001417 if (skb_header_cloned(skb) &&
1418 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1419 return ERR_PTR(err);
1420 }
1421
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001422 rcu_read_lock();
1423 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
1424 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
Patrick McHardy84fa7932006-08-29 16:44:56 -07001425 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
Herbert Xua430a432006-07-08 13:34:56 -07001426 err = ptype->gso_send_check(skb);
1427 segs = ERR_PTR(err);
1428 if (err || skb_gso_ok(skb, features))
1429 break;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -07001430 __skb_push(skb, (skb->data -
1431 skb_network_header(skb)));
Herbert Xua430a432006-07-08 13:34:56 -07001432 }
Herbert Xu576a30e2006-06-27 13:22:38 -07001433 segs = ptype->gso_segment(skb, features);
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001434 break;
1435 }
1436 }
1437 rcu_read_unlock();
1438
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07001439 __skb_push(skb, skb->data - skb_mac_header(skb));
Herbert Xu576a30e2006-06-27 13:22:38 -07001440
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001441 return segs;
1442}
1443
1444EXPORT_SYMBOL(skb_gso_segment);
1445
Herbert Xufb286bb2005-11-10 13:01:24 -08001446/* Take action when hardware reception checksum errors are detected. */
1447#ifdef CONFIG_BUG
1448void netdev_rx_csum_fault(struct net_device *dev)
1449{
1450 if (net_ratelimit()) {
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001451 printk(KERN_ERR "%s: hw csum failure.\n",
Stephen Hemminger246a4212005-12-08 15:21:39 -08001452 dev ? dev->name : "<unknown>");
Herbert Xufb286bb2005-11-10 13:01:24 -08001453 dump_stack();
1454 }
1455}
1456EXPORT_SYMBOL(netdev_rx_csum_fault);
1457#endif
1458
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459/* Actually, we should eliminate this check as soon as we know, that:
1460 * 1. IOMMU is present and allows to map all the memory.
1461 * 2. No high memory really exists on this machine.
1462 */
1463
1464static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1465{
Herbert Xu3d3a8532006-06-27 13:33:10 -07001466#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 int i;
1468
1469 if (dev->features & NETIF_F_HIGHDMA)
1470 return 0;
1471
1472 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1473 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1474 return 1;
1475
Herbert Xu3d3a8532006-06-27 13:33:10 -07001476#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 return 0;
1478}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001480struct dev_gso_cb {
1481 void (*destructor)(struct sk_buff *skb);
1482};
1483
1484#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1485
1486static void dev_gso_skb_destructor(struct sk_buff *skb)
1487{
1488 struct dev_gso_cb *cb;
1489
1490 do {
1491 struct sk_buff *nskb = skb->next;
1492
1493 skb->next = nskb->next;
1494 nskb->next = NULL;
1495 kfree_skb(nskb);
1496 } while (skb->next);
1497
1498 cb = DEV_GSO_CB(skb);
1499 if (cb->destructor)
1500 cb->destructor(skb);
1501}
1502
1503/**
1504 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1505 * @skb: buffer to segment
1506 *
1507 * This function segments the given skb and stores the list of segments
1508 * in skb->next.
1509 */
1510static int dev_gso_segment(struct sk_buff *skb)
1511{
1512 struct net_device *dev = skb->dev;
1513 struct sk_buff *segs;
Herbert Xu576a30e2006-06-27 13:22:38 -07001514 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1515 NETIF_F_SG : 0);
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001516
Herbert Xu576a30e2006-06-27 13:22:38 -07001517 segs = skb_gso_segment(skb, features);
1518
1519 /* Verifying header integrity only. */
1520 if (!segs)
1521 return 0;
1522
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001523 if (unlikely(IS_ERR(segs)))
1524 return PTR_ERR(segs);
1525
1526 skb->next = segs;
1527 DEV_GSO_CB(skb)->destructor = skb->destructor;
1528 skb->destructor = dev_gso_skb_destructor;
1529
1530 return 0;
1531}
1532
1533int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1534{
1535 if (likely(!skb->next)) {
Stephen Hemminger9be9a6b2007-04-20 17:02:45 -07001536 if (!list_empty(&ptype_all))
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001537 dev_queue_xmit_nit(skb, dev);
1538
Herbert Xu576a30e2006-06-27 13:22:38 -07001539 if (netif_needs_gso(dev, skb)) {
1540 if (unlikely(dev_gso_segment(skb)))
1541 goto out_kfree_skb;
1542 if (skb->next)
1543 goto gso;
1544 }
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001545
Herbert Xu576a30e2006-06-27 13:22:38 -07001546 return dev->hard_start_xmit(skb, dev);
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001547 }
1548
Herbert Xu576a30e2006-06-27 13:22:38 -07001549gso:
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001550 do {
1551 struct sk_buff *nskb = skb->next;
1552 int rc;
1553
1554 skb->next = nskb->next;
1555 nskb->next = NULL;
1556 rc = dev->hard_start_xmit(nskb, dev);
1557 if (unlikely(rc)) {
Michael Chanf54d9e82006-06-25 23:57:04 -07001558 nskb->next = skb->next;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001559 skb->next = nskb;
1560 return rc;
1561 }
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07001562 if (unlikely((netif_queue_stopped(dev) ||
1563 netif_subqueue_stopped(dev, skb->queue_mapping)) &&
1564 skb->next))
Michael Chanf54d9e82006-06-25 23:57:04 -07001565 return NETDEV_TX_BUSY;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001566 } while (skb->next);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001567
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001568 skb->destructor = DEV_GSO_CB(skb)->destructor;
1569
1570out_kfree_skb:
1571 kfree_skb(skb);
1572 return 0;
1573}
1574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575#define HARD_TX_LOCK(dev, cpu) { \
1576 if ((dev->features & NETIF_F_LLTX) == 0) { \
Herbert Xu932ff272006-06-09 12:20:56 -07001577 netif_tx_lock(dev); \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 } \
1579}
1580
1581#define HARD_TX_UNLOCK(dev) { \
1582 if ((dev->features & NETIF_F_LLTX) == 0) { \
Herbert Xu932ff272006-06-09 12:20:56 -07001583 netif_tx_unlock(dev); \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 } \
1585}
1586
1587/**
1588 * dev_queue_xmit - transmit a buffer
1589 * @skb: buffer to transmit
1590 *
1591 * Queue a buffer for transmission to a network device. The caller must
1592 * have set the device and priority and built the buffer before calling
1593 * this function. The function can be called from an interrupt.
1594 *
1595 * A negative errno code is returned on a failure. A success does not
1596 * guarantee the frame will be transmitted as it may be dropped due
1597 * to congestion or traffic shaping.
Ben Greearaf191362005-04-24 20:12:36 -07001598 *
1599 * -----------------------------------------------------------------------------------
1600 * I notice this method can also return errors from the queue disciplines,
1601 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1602 * be positive.
1603 *
1604 * Regardless of the return value, the skb is consumed, so it is currently
1605 * difficult to retry a send to this method. (You can bump the ref count
1606 * before sending to hold a reference for retry if you are careful.)
1607 *
1608 * When calling this method, interrupts MUST be enabled. This is because
1609 * the BH enable code must have IRQs enabled so that it will not deadlock.
1610 * --BLG
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 */
1612
1613int dev_queue_xmit(struct sk_buff *skb)
1614{
1615 struct net_device *dev = skb->dev;
1616 struct Qdisc *q;
1617 int rc = -ENOMEM;
1618
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001619 /* GSO will handle the following emulations directly. */
1620 if (netif_needs_gso(dev, skb))
1621 goto gso;
1622
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 if (skb_shinfo(skb)->frag_list &&
1624 !(dev->features & NETIF_F_FRAGLIST) &&
Herbert Xu364c6ba2006-06-09 16:10:40 -07001625 __skb_linearize(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 goto out_kfree_skb;
1627
1628 /* Fragmented skb is linearized if device does not support SG,
1629 * or if at least one of fragments is in highmem and device
1630 * does not support DMA from it.
1631 */
1632 if (skb_shinfo(skb)->nr_frags &&
1633 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
Herbert Xu364c6ba2006-06-09 16:10:40 -07001634 __skb_linearize(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635 goto out_kfree_skb;
1636
1637 /* If packet is not checksummed and device does not support
1638 * checksumming for this protocol, complete checksumming here.
1639 */
Herbert Xu663ead32007-04-09 11:59:07 -07001640 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1641 skb_set_transport_header(skb, skb->csum_start -
1642 skb_headroom(skb));
1643
Herbert Xua2988302007-06-28 13:44:37 -07001644 if (!(dev->features & NETIF_F_GEN_CSUM) &&
1645 !((dev->features & NETIF_F_IP_CSUM) &&
1646 skb->protocol == htons(ETH_P_IP)) &&
1647 !((dev->features & NETIF_F_IPV6_CSUM) &&
1648 skb->protocol == htons(ETH_P_IPV6)))
Herbert Xu663ead32007-04-09 11:59:07 -07001649 if (skb_checksum_help(skb))
1650 goto out_kfree_skb;
1651 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001653gso:
Eric Dumazet2d7ceec2005-09-27 15:22:58 -07001654 spin_lock_prefetch(&dev->queue_lock);
1655
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001656 /* Disable soft irqs for various locks below. Also
1657 * stops preemption for RCU.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001659 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001661 /* Updates of qdisc are serialized by queue_lock.
1662 * The struct Qdisc which is pointed to by qdisc is now a
1663 * rcu structure - it may be accessed without acquiring
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 * a lock (but the structure may be stale.) The freeing of the
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001665 * qdisc will be deferred until it's known that there are no
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 * more references to it.
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001667 *
1668 * If the qdisc has an enqueue function, we still need to
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 * hold the queue_lock before calling it, since queue_lock
1670 * also serializes access to the device queue.
1671 */
1672
1673 q = rcu_dereference(dev->qdisc);
1674#ifdef CONFIG_NET_CLS_ACT
1675 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1676#endif
1677 if (q->enqueue) {
1678 /* Grab device queue */
1679 spin_lock(&dev->queue_lock);
Patrick McHardy85670cc2006-09-27 16:45:45 -07001680 q = dev->qdisc;
1681 if (q->enqueue) {
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07001682 /* reset queue_mapping to zero */
1683 skb->queue_mapping = 0;
Patrick McHardy85670cc2006-09-27 16:45:45 -07001684 rc = q->enqueue(skb, q);
1685 qdisc_run(dev);
1686 spin_unlock(&dev->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687
Patrick McHardy85670cc2006-09-27 16:45:45 -07001688 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1689 goto out;
1690 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 spin_unlock(&dev->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 }
1693
1694 /* The device has no queue. Common case for software devices:
1695 loopback, all the sorts of tunnels...
1696
Herbert Xu932ff272006-06-09 12:20:56 -07001697 Really, it is unlikely that netif_tx_lock protection is necessary
1698 here. (f.e. loopback and IP tunnels are clean ignoring statistics
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 counters.)
1700 However, it is possible, that they rely on protection
1701 made by us here.
1702
1703 Check this and shot the lock. It is not prone from deadlocks.
1704 Either shot noqueue qdisc, it is even simpler 8)
1705 */
1706 if (dev->flags & IFF_UP) {
1707 int cpu = smp_processor_id(); /* ok because BHs are off */
1708
1709 if (dev->xmit_lock_owner != cpu) {
1710
1711 HARD_TX_LOCK(dev, cpu);
1712
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07001713 if (!netif_queue_stopped(dev) &&
1714 !netif_subqueue_stopped(dev, skb->queue_mapping)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715 rc = 0;
Herbert Xuf6a78bf2006-06-22 02:57:17 -07001716 if (!dev_hard_start_xmit(skb, dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717 HARD_TX_UNLOCK(dev);
1718 goto out;
1719 }
1720 }
1721 HARD_TX_UNLOCK(dev);
1722 if (net_ratelimit())
1723 printk(KERN_CRIT "Virtual device %s asks to "
1724 "queue packet!\n", dev->name);
1725 } else {
1726 /* Recursion is detected! It is possible,
1727 * unfortunately */
1728 if (net_ratelimit())
1729 printk(KERN_CRIT "Dead loop on virtual device "
1730 "%s, fix it urgently!\n", dev->name);
1731 }
1732 }
1733
1734 rc = -ENETDOWN;
Herbert Xud4828d82006-06-22 02:28:18 -07001735 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
1737out_kfree_skb:
1738 kfree_skb(skb);
1739 return rc;
1740out:
Herbert Xud4828d82006-06-22 02:28:18 -07001741 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 return rc;
1743}
1744
1745
1746/*=======================================================================
1747 Receiver routines
1748 =======================================================================*/
1749
Stephen Hemminger6b2bedc2007-03-12 14:33:50 -07001750int netdev_max_backlog __read_mostly = 1000;
1751int netdev_budget __read_mostly = 300;
1752int weight_p __read_mostly = 64; /* old backlog weight */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753
1754DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1755
1756
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757/**
1758 * netif_rx - post buffer to the network code
1759 * @skb: buffer to post
1760 *
1761 * This function receives a packet from a device driver and queues it for
1762 * the upper (protocol) levels to process. It always succeeds. The buffer
1763 * may be dropped during processing for congestion control or by the
1764 * protocol layers.
1765 *
1766 * return values:
1767 * NET_RX_SUCCESS (no congestion)
1768 * NET_RX_CN_LOW (low congestion)
1769 * NET_RX_CN_MOD (moderate congestion)
1770 * NET_RX_CN_HIGH (high congestion)
1771 * NET_RX_DROP (packet was dropped)
1772 *
1773 */
1774
1775int netif_rx(struct sk_buff *skb)
1776{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 struct softnet_data *queue;
1778 unsigned long flags;
1779
1780 /* if netpoll wants it, pretend we never saw it */
1781 if (netpoll_rx(skb))
1782 return NET_RX_DROP;
1783
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -07001784 if (!skb->tstamp.tv64)
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001785 net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786
1787 /*
1788 * The code is rearranged so that the path is the most
1789 * short when CPU is congested, but is still operating.
1790 */
1791 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 queue = &__get_cpu_var(softnet_data);
1793
1794 __get_cpu_var(netdev_rx_stat).total++;
1795 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1796 if (queue->input_pkt_queue.qlen) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797enqueue:
1798 dev_hold(skb->dev);
1799 __skb_queue_tail(&queue->input_pkt_queue, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 local_irq_restore(flags);
Stephen Hemminger34008d82005-06-23 20:10:00 -07001801 return NET_RX_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 }
1803
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001804 napi_schedule(&queue->backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 goto enqueue;
1806 }
1807
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 __get_cpu_var(netdev_rx_stat).dropped++;
1809 local_irq_restore(flags);
1810
1811 kfree_skb(skb);
1812 return NET_RX_DROP;
1813}
1814
1815int netif_rx_ni(struct sk_buff *skb)
1816{
1817 int err;
1818
1819 preempt_disable();
1820 err = netif_rx(skb);
1821 if (local_softirq_pending())
1822 do_softirq();
1823 preempt_enable();
1824
1825 return err;
1826}
1827
1828EXPORT_SYMBOL(netif_rx_ni);
1829
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001830static inline struct net_device *skb_bond(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831{
1832 struct net_device *dev = skb->dev;
1833
Jay Vosburgh8f903c72006-02-21 16:36:44 -08001834 if (dev->master) {
David S. Miller7ea49ed2006-08-14 17:08:36 -07001835 if (skb_bond_should_drop(skb)) {
Jay Vosburgh8f903c72006-02-21 16:36:44 -08001836 kfree_skb(skb);
1837 return NULL;
1838 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 skb->dev = dev->master;
Jay Vosburgh8f903c72006-02-21 16:36:44 -08001840 }
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001841
1842 return dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843}
1844
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001845
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846static void net_tx_action(struct softirq_action *h)
1847{
1848 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1849
1850 if (sd->completion_queue) {
1851 struct sk_buff *clist;
1852
1853 local_irq_disable();
1854 clist = sd->completion_queue;
1855 sd->completion_queue = NULL;
1856 local_irq_enable();
1857
1858 while (clist) {
1859 struct sk_buff *skb = clist;
1860 clist = clist->next;
1861
1862 BUG_TRAP(!atomic_read(&skb->users));
1863 __kfree_skb(skb);
1864 }
1865 }
1866
1867 if (sd->output_queue) {
1868 struct net_device *head;
1869
1870 local_irq_disable();
1871 head = sd->output_queue;
1872 sd->output_queue = NULL;
1873 local_irq_enable();
1874
1875 while (head) {
1876 struct net_device *dev = head;
1877 head = head->next_sched;
1878
1879 smp_mb__before_clear_bit();
1880 clear_bit(__LINK_STATE_SCHED, &dev->state);
1881
1882 if (spin_trylock(&dev->queue_lock)) {
1883 qdisc_run(dev);
1884 spin_unlock(&dev->queue_lock);
1885 } else {
1886 netif_schedule(dev);
1887 }
1888 }
1889 }
1890}
1891
Stephen Hemminger6f05f622007-03-08 20:46:03 -08001892static inline int deliver_skb(struct sk_buff *skb,
1893 struct packet_type *pt_prev,
1894 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895{
1896 atomic_inc(&skb->users);
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001897 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898}
1899
1900#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
Stephen Hemminger6229e362007-03-21 13:38:47 -07001901/* These hooks defined here for ATM */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902struct net_bridge;
1903struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1904 unsigned char *addr);
Stephen Hemminger6229e362007-03-21 13:38:47 -07001905void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906
Stephen Hemminger6229e362007-03-21 13:38:47 -07001907/*
1908 * If bridge module is loaded call bridging hook.
1909 * returns NULL if packet was consumed.
1910 */
1911struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
1912 struct sk_buff *skb) __read_mostly;
1913static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
1914 struct packet_type **pt_prev, int *ret,
1915 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916{
1917 struct net_bridge_port *port;
1918
Stephen Hemminger6229e362007-03-21 13:38:47 -07001919 if (skb->pkt_type == PACKET_LOOPBACK ||
1920 (port = rcu_dereference(skb->dev->br_port)) == NULL)
1921 return skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922
1923 if (*pt_prev) {
Stephen Hemminger6229e362007-03-21 13:38:47 -07001924 *ret = deliver_skb(skb, *pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 *pt_prev = NULL;
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001926 }
1927
Stephen Hemminger6229e362007-03-21 13:38:47 -07001928 return br_handle_frame_hook(port, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929}
1930#else
Stephen Hemminger6229e362007-03-21 13:38:47 -07001931#define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932#endif
1933
Patrick McHardyb863ceb2007-07-14 18:55:06 -07001934#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
1935struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
1936EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
1937
1938static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
1939 struct packet_type **pt_prev,
1940 int *ret,
1941 struct net_device *orig_dev)
1942{
1943 if (skb->dev->macvlan_port == NULL)
1944 return skb;
1945
1946 if (*pt_prev) {
1947 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1948 *pt_prev = NULL;
1949 }
1950 return macvlan_handle_frame_hook(skb);
1951}
1952#else
1953#define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
1954#endif
1955
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956#ifdef CONFIG_NET_CLS_ACT
1957/* TODO: Maybe we should just force sch_ingress to be compiled in
1958 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1959 * a compare and 2 stores extra right now if we dont have it on
1960 * but have CONFIG_NET_CLS_ACT
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001961 * NOTE: This doesnt stop any functionality; if you dont have
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 * the ingress scheduler, you just cant add policies on ingress.
1963 *
1964 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001965static int ing_filter(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966{
1967 struct Qdisc *q;
1968 struct net_device *dev = skb->dev;
1969 int result = TC_ACT_OK;
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09001970
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 if (dev->qdisc_ingress) {
1972 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1973 if (MAX_RED_LOOP < ttl++) {
Patrick McHardyc01003c2007-03-29 11:46:52 -07001974 printk(KERN_WARNING "Redir loop detected Dropping packet (%d->%d)\n",
1975 skb->iif, skb->dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 return TC_ACT_SHOT;
1977 }
1978
1979 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1980
1981 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
David S. Miller86e65da2005-08-09 19:36:29 -07001982
Patrick McHardyfd44de72007-04-16 17:07:08 -07001983 spin_lock(&dev->ingress_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984 if ((q = dev->qdisc_ingress) != NULL)
1985 result = q->enqueue(skb, q);
Patrick McHardyfd44de72007-04-16 17:07:08 -07001986 spin_unlock(&dev->ingress_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987
1988 }
1989
1990 return result;
1991}
1992#endif
1993
1994int netif_receive_skb(struct sk_buff *skb)
1995{
1996 struct packet_type *ptype, *pt_prev;
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001997 struct net_device *orig_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998 int ret = NET_RX_DROP;
Al Viro252e3342006-11-14 20:48:11 -08001999 __be16 type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000
2001 /* if we've gotten here through NAPI, check netpoll */
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002002 if (netpoll_receive_skb(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 return NET_RX_DROP;
2004
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -07002005 if (!skb->tstamp.tv64)
Patrick McHardya61bbcf2005-08-14 17:24:31 -07002006 net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007
Patrick McHardyc01003c2007-03-29 11:46:52 -07002008 if (!skb->iif)
2009 skb->iif = skb->dev->ifindex;
David S. Miller86e65da2005-08-09 19:36:29 -07002010
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002011 orig_dev = skb_bond(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012
Jay Vosburgh8f903c72006-02-21 16:36:44 -08002013 if (!orig_dev)
2014 return NET_RX_DROP;
2015
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 __get_cpu_var(netdev_rx_stat).total++;
2017
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -07002018 skb_reset_network_header(skb);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03002019 skb_reset_transport_header(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -07002020 skb->mac_len = skb->network_header - skb->mac_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021
2022 pt_prev = NULL;
2023
2024 rcu_read_lock();
2025
2026#ifdef CONFIG_NET_CLS_ACT
2027 if (skb->tc_verd & TC_NCLS) {
2028 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2029 goto ncls;
2030 }
2031#endif
2032
2033 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2034 if (!ptype->dev || ptype->dev == skb->dev) {
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002035 if (pt_prev)
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002036 ret = deliver_skb(skb, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037 pt_prev = ptype;
2038 }
2039 }
2040
2041#ifdef CONFIG_NET_CLS_ACT
2042 if (pt_prev) {
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002043 ret = deliver_skb(skb, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044 pt_prev = NULL; /* noone else should process this after*/
2045 } else {
2046 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2047 }
2048
2049 ret = ing_filter(skb);
2050
2051 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
2052 kfree_skb(skb);
2053 goto out;
2054 }
2055
2056 skb->tc_verd = 0;
2057ncls:
2058#endif
2059
Stephen Hemminger6229e362007-03-21 13:38:47 -07002060 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2061 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 goto out;
Patrick McHardyb863ceb2007-07-14 18:55:06 -07002063 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2064 if (!skb)
2065 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066
2067 type = skb->protocol;
2068 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
2069 if (ptype->type == type &&
2070 (!ptype->dev || ptype->dev == skb->dev)) {
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002071 if (pt_prev)
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002072 ret = deliver_skb(skb, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 pt_prev = ptype;
2074 }
2075 }
2076
2077 if (pt_prev) {
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002078 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079 } else {
2080 kfree_skb(skb);
2081 /* Jamal, now you will not able to escape explaining
2082 * me how you were going to use this. :-)
2083 */
2084 ret = NET_RX_DROP;
2085 }
2086
2087out:
2088 rcu_read_unlock();
2089 return ret;
2090}
2091
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002092static int process_backlog(struct napi_struct *napi, int quota)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093{
2094 int work = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2096 unsigned long start_time = jiffies;
2097
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002098 napi->weight = weight_p;
2099 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 struct sk_buff *skb;
2101 struct net_device *dev;
2102
2103 local_irq_disable();
2104 skb = __skb_dequeue(&queue->input_pkt_queue);
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002105 if (!skb) {
2106 __napi_complete(napi);
2107 local_irq_enable();
2108 break;
2109 }
2110
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111 local_irq_enable();
2112
2113 dev = skb->dev;
2114
2115 netif_receive_skb(skb);
2116
2117 dev_put(dev);
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002118 } while (++work < quota && jiffies == start_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002120 return work;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121}
2122
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002123/**
2124 * __napi_schedule - schedule for receive
2125 * @napi: entry to schedule
2126 *
2127 * The entry's receive function will be scheduled to run
2128 */
2129void fastcall __napi_schedule(struct napi_struct *n)
2130{
2131 unsigned long flags;
2132
2133 local_irq_save(flags);
2134 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2135 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2136 local_irq_restore(flags);
2137}
2138EXPORT_SYMBOL(__napi_schedule);
2139
2140
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141static void net_rx_action(struct softirq_action *h)
2142{
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002143 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 unsigned long start_time = jiffies;
Stephen Hemminger51b0bde2005-06-23 20:14:40 -07002145 int budget = netdev_budget;
Matt Mackall53fb95d2005-08-11 19:27:43 -07002146 void *have;
2147
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148 local_irq_disable();
2149
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002150 while (!list_empty(list)) {
2151 struct napi_struct *n;
2152 int work, weight;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002154 /* If softirq window is exhuasted then punt.
2155 *
2156 * Note that this is a slight policy change from the
2157 * previous NAPI code, which would allow up to 2
2158 * jiffies to pass before breaking out. The test
2159 * used to be "jiffies - start_time > 1".
2160 */
2161 if (unlikely(budget <= 0 || jiffies != start_time))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162 goto softnet_break;
2163
2164 local_irq_enable();
2165
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002166 /* Even though interrupts have been re-enabled, this
2167 * access is safe because interrupts can only add new
2168 * entries to the tail of this list, and only ->poll()
2169 * calls can remove this head entry from the list.
2170 */
2171 n = list_entry(list->next, struct napi_struct, poll_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002172
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002173 have = netpoll_poll_lock(n);
2174
2175 weight = n->weight;
2176
2177 work = n->poll(n, weight);
2178
2179 WARN_ON_ONCE(work > weight);
2180
2181 budget -= work;
2182
2183 local_irq_disable();
2184
2185 /* Drivers must not modify the NAPI state if they
2186 * consume the entire weight. In such cases this code
2187 * still "owns" the NAPI instance and therefore can
2188 * move the instance around on the list at-will.
2189 */
2190 if (unlikely(work == weight))
2191 list_move_tail(&n->poll_list, list);
2192
2193 netpoll_poll_unlock(have);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 }
2195out:
Shannon Nelson515e06c2007-06-23 23:09:23 -07002196 local_irq_enable();
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002197
Chris Leechdb217332006-06-17 21:24:58 -07002198#ifdef CONFIG_NET_DMA
2199 /*
2200 * There may not be any more sk_buffs coming right now, so push
2201 * any pending DMA copies to hardware
2202 */
Dan Williamsd379b012007-07-09 11:56:42 -07002203 if (!cpus_empty(net_dma.channel_mask)) {
2204 int chan_idx;
2205 for_each_cpu_mask(chan_idx, net_dma.channel_mask) {
2206 struct dma_chan *chan = net_dma.channels[chan_idx];
2207 if (chan)
2208 dma_async_memcpy_issue_pending(chan);
2209 }
Chris Leechdb217332006-06-17 21:24:58 -07002210 }
2211#endif
Stephen Hemmingerbea33482007-10-03 16:41:36 -07002212
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213 return;
2214
2215softnet_break:
2216 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2217 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2218 goto out;
2219}
2220
2221static gifconf_func_t * gifconf_list [NPROTO];
2222
2223/**
2224 * register_gifconf - register a SIOCGIF handler
2225 * @family: Address family
2226 * @gifconf: Function handler
2227 *
2228 * Register protocol dependent address dumping routines. The handler
2229 * that is passed must not be freed or reused until it has been replaced
2230 * by another handler.
2231 */
2232int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2233{
2234 if (family >= NPROTO)
2235 return -EINVAL;
2236 gifconf_list[family] = gifconf;
2237 return 0;
2238}
2239
2240
2241/*
2242 * Map an interface index to its name (SIOCGIFNAME)
2243 */
2244
2245/*
2246 * We need this ioctl for efficient implementation of the
2247 * if_indextoname() function required by the IPv6 API. Without
2248 * it, we would have to search all the interfaces to find a
2249 * match. --pb
2250 */
2251
Eric W. Biederman881d9662007-09-17 11:56:21 -07002252static int dev_ifname(struct net *net, struct ifreq __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253{
2254 struct net_device *dev;
2255 struct ifreq ifr;
2256
2257 /*
2258 * Fetch the caller's info block.
2259 */
2260
2261 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2262 return -EFAULT;
2263
2264 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -07002265 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266 if (!dev) {
2267 read_unlock(&dev_base_lock);
2268 return -ENODEV;
2269 }
2270
2271 strcpy(ifr.ifr_name, dev->name);
2272 read_unlock(&dev_base_lock);
2273
2274 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2275 return -EFAULT;
2276 return 0;
2277}
2278
2279/*
2280 * Perform a SIOCGIFCONF call. This structure will change
2281 * size eventually, and there is nothing I can do about it.
2282 * Thus we will need a 'compatibility mode'.
2283 */
2284
Eric W. Biederman881d9662007-09-17 11:56:21 -07002285static int dev_ifconf(struct net *net, char __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286{
2287 struct ifconf ifc;
2288 struct net_device *dev;
2289 char __user *pos;
2290 int len;
2291 int total;
2292 int i;
2293
2294 /*
2295 * Fetch the caller's info block.
2296 */
2297
2298 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2299 return -EFAULT;
2300
2301 pos = ifc.ifc_buf;
2302 len = ifc.ifc_len;
2303
2304 /*
2305 * Loop over the interfaces, and write an info block for each.
2306 */
2307
2308 total = 0;
Eric W. Biederman881d9662007-09-17 11:56:21 -07002309 for_each_netdev(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002310 for (i = 0; i < NPROTO; i++) {
2311 if (gifconf_list[i]) {
2312 int done;
2313 if (!pos)
2314 done = gifconf_list[i](dev, NULL, 0);
2315 else
2316 done = gifconf_list[i](dev, pos + total,
2317 len - total);
2318 if (done < 0)
2319 return -EFAULT;
2320 total += done;
2321 }
2322 }
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002323 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002324
2325 /*
2326 * All done. Write the updated control block back to the caller.
2327 */
2328 ifc.ifc_len = total;
2329
2330 /*
2331 * Both BSD and Solaris return 0 here, so we do too.
2332 */
2333 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2334}
2335
2336#ifdef CONFIG_PROC_FS
2337/*
2338 * This is invoked by the /proc filesystem handler to display a device
2339 * in detail.
2340 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2342{
Eric W. Biederman881d9662007-09-17 11:56:21 -07002343 struct net *net = seq->private;
Pavel Emelianov7562f872007-05-03 15:13:45 -07002344 loff_t off;
2345 struct net_device *dev;
2346
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347 read_lock(&dev_base_lock);
Pavel Emelianov7562f872007-05-03 15:13:45 -07002348 if (!*pos)
2349 return SEQ_START_TOKEN;
2350
2351 off = 1;
Eric W. Biederman881d9662007-09-17 11:56:21 -07002352 for_each_netdev(net, dev)
Pavel Emelianov7562f872007-05-03 15:13:45 -07002353 if (off++ == *pos)
2354 return dev;
2355
2356 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357}
2358
2359void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2360{
Eric W. Biederman881d9662007-09-17 11:56:21 -07002361 struct net *net = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362 ++*pos;
Pavel Emelianov7562f872007-05-03 15:13:45 -07002363 return v == SEQ_START_TOKEN ?
Eric W. Biederman881d9662007-09-17 11:56:21 -07002364 first_net_device(net) : next_net_device((struct net_device *)v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002365}
2366
2367void dev_seq_stop(struct seq_file *seq, void *v)
2368{
2369 read_unlock(&dev_base_lock);
2370}
2371
2372static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2373{
Rusty Russellc45d2862007-03-28 14:29:08 -07002374 struct net_device_stats *stats = dev->get_stats(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002375
Rusty Russell5a1b5892007-04-28 21:04:03 -07002376 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2377 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2378 dev->name, stats->rx_bytes, stats->rx_packets,
2379 stats->rx_errors,
2380 stats->rx_dropped + stats->rx_missed_errors,
2381 stats->rx_fifo_errors,
2382 stats->rx_length_errors + stats->rx_over_errors +
2383 stats->rx_crc_errors + stats->rx_frame_errors,
2384 stats->rx_compressed, stats->multicast,
2385 stats->tx_bytes, stats->tx_packets,
2386 stats->tx_errors, stats->tx_dropped,
2387 stats->tx_fifo_errors, stats->collisions,
2388 stats->tx_carrier_errors +
2389 stats->tx_aborted_errors +
2390 stats->tx_window_errors +
2391 stats->tx_heartbeat_errors,
2392 stats->tx_compressed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393}
2394
2395/*
2396 * Called from the PROCfs module. This now uses the new arbitrary sized
2397 * /proc/net interface to create /proc/net/dev
2398 */
2399static int dev_seq_show(struct seq_file *seq, void *v)
2400{
2401 if (v == SEQ_START_TOKEN)
2402 seq_puts(seq, "Inter-| Receive "
2403 " | Transmit\n"
2404 " face |bytes packets errs drop fifo frame "
2405 "compressed multicast|bytes packets errs "
2406 "drop fifo colls carrier compressed\n");
2407 else
2408 dev_seq_printf_stats(seq, v);
2409 return 0;
2410}
2411
2412static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2413{
2414 struct netif_rx_stats *rc = NULL;
2415
2416 while (*pos < NR_CPUS)
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002417 if (cpu_online(*pos)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002418 rc = &per_cpu(netdev_rx_stat, *pos);
2419 break;
2420 } else
2421 ++*pos;
2422 return rc;
2423}
2424
2425static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2426{
2427 return softnet_get_online(pos);
2428}
2429
2430static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2431{
2432 ++*pos;
2433 return softnet_get_online(pos);
2434}
2435
2436static void softnet_seq_stop(struct seq_file *seq, void *v)
2437{
2438}
2439
2440static int softnet_seq_show(struct seq_file *seq, void *v)
2441{
2442 struct netif_rx_stats *s = v;
2443
2444 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
Stephen Hemminger31aa02c2005-06-23 20:12:48 -07002445 s->total, s->dropped, s->time_squeeze, 0,
Stephen Hemmingerc1ebcdb2005-06-23 20:08:59 -07002446 0, 0, 0, 0, /* was fastroute */
2447 s->cpu_collision );
Linus Torvalds1da177e2005-04-16 15:20:36 -07002448 return 0;
2449}
2450
Stephen Hemmingerf6908082007-03-12 14:34:29 -07002451static const struct seq_operations dev_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002452 .start = dev_seq_start,
2453 .next = dev_seq_next,
2454 .stop = dev_seq_stop,
2455 .show = dev_seq_show,
2456};
2457
2458static int dev_seq_open(struct inode *inode, struct file *file)
2459{
Eric W. Biederman881d9662007-09-17 11:56:21 -07002460 struct seq_file *seq;
2461 int res;
2462 res = seq_open(file, &dev_seq_ops);
2463 if (!res) {
2464 seq = file->private_data;
2465 seq->private = get_net(PROC_NET(inode));
2466 }
2467 return res;
2468}
2469
2470static int dev_seq_release(struct inode *inode, struct file *file)
2471{
2472 struct seq_file *seq = file->private_data;
2473 struct net *net = seq->private;
2474 put_net(net);
2475 return seq_release(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002476}
2477
Arjan van de Ven9a321442007-02-12 00:55:35 -08002478static const struct file_operations dev_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002479 .owner = THIS_MODULE,
2480 .open = dev_seq_open,
2481 .read = seq_read,
2482 .llseek = seq_lseek,
Eric W. Biederman881d9662007-09-17 11:56:21 -07002483 .release = dev_seq_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484};
2485
Stephen Hemmingerf6908082007-03-12 14:34:29 -07002486static const struct seq_operations softnet_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487 .start = softnet_seq_start,
2488 .next = softnet_seq_next,
2489 .stop = softnet_seq_stop,
2490 .show = softnet_seq_show,
2491};
2492
2493static int softnet_seq_open(struct inode *inode, struct file *file)
2494{
2495 return seq_open(file, &softnet_seq_ops);
2496}
2497
Arjan van de Ven9a321442007-02-12 00:55:35 -08002498static const struct file_operations softnet_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499 .owner = THIS_MODULE,
2500 .open = softnet_seq_open,
2501 .read = seq_read,
2502 .llseek = seq_lseek,
2503 .release = seq_release,
2504};
2505
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07002506static void *ptype_get_idx(loff_t pos)
2507{
2508 struct packet_type *pt = NULL;
2509 loff_t i = 0;
2510 int t;
2511
2512 list_for_each_entry_rcu(pt, &ptype_all, list) {
2513 if (i == pos)
2514 return pt;
2515 ++i;
2516 }
2517
2518 for (t = 0; t < 16; t++) {
2519 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2520 if (i == pos)
2521 return pt;
2522 ++i;
2523 }
2524 }
2525 return NULL;
2526}
2527
2528static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2529{
2530 rcu_read_lock();
2531 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2532}
2533
2534static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2535{
2536 struct packet_type *pt;
2537 struct list_head *nxt;
2538 int hash;
2539
2540 ++*pos;
2541 if (v == SEQ_START_TOKEN)
2542 return ptype_get_idx(0);
2543
2544 pt = v;
2545 nxt = pt->list.next;
2546 if (pt->type == htons(ETH_P_ALL)) {
2547 if (nxt != &ptype_all)
2548 goto found;
2549 hash = 0;
2550 nxt = ptype_base[0].next;
2551 } else
2552 hash = ntohs(pt->type) & 15;
2553
2554 while (nxt == &ptype_base[hash]) {
2555 if (++hash >= 16)
2556 return NULL;
2557 nxt = ptype_base[hash].next;
2558 }
2559found:
2560 return list_entry(nxt, struct packet_type, list);
2561}
2562
2563static void ptype_seq_stop(struct seq_file *seq, void *v)
2564{
2565 rcu_read_unlock();
2566}
2567
2568static void ptype_seq_decode(struct seq_file *seq, void *sym)
2569{
2570#ifdef CONFIG_KALLSYMS
2571 unsigned long offset = 0, symsize;
2572 const char *symname;
2573 char *modname;
2574 char namebuf[128];
2575
2576 symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
2577 &modname, namebuf);
2578
2579 if (symname) {
2580 char *delim = ":";
2581
2582 if (!modname)
2583 modname = delim = "";
2584 seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
2585 symname, offset);
2586 return;
2587 }
2588#endif
2589
2590 seq_printf(seq, "[%p]", sym);
2591}
2592
2593static int ptype_seq_show(struct seq_file *seq, void *v)
2594{
2595 struct packet_type *pt = v;
2596
2597 if (v == SEQ_START_TOKEN)
2598 seq_puts(seq, "Type Device Function\n");
2599 else {
2600 if (pt->type == htons(ETH_P_ALL))
2601 seq_puts(seq, "ALL ");
2602 else
2603 seq_printf(seq, "%04x", ntohs(pt->type));
2604
2605 seq_printf(seq, " %-8s ",
2606 pt->dev ? pt->dev->name : "");
2607 ptype_seq_decode(seq, pt->func);
2608 seq_putc(seq, '\n');
2609 }
2610
2611 return 0;
2612}
2613
2614static const struct seq_operations ptype_seq_ops = {
2615 .start = ptype_seq_start,
2616 .next = ptype_seq_next,
2617 .stop = ptype_seq_stop,
2618 .show = ptype_seq_show,
2619};
2620
2621static int ptype_seq_open(struct inode *inode, struct file *file)
2622{
2623 return seq_open(file, &ptype_seq_ops);
2624}
2625
2626static const struct file_operations ptype_seq_fops = {
2627 .owner = THIS_MODULE,
2628 .open = ptype_seq_open,
2629 .read = seq_read,
2630 .llseek = seq_lseek,
2631 .release = seq_release,
2632};
2633
2634
Eric W. Biederman881d9662007-09-17 11:56:21 -07002635static int dev_proc_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636{
2637 int rc = -ENOMEM;
2638
Eric W. Biederman881d9662007-09-17 11:56:21 -07002639 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640 goto out;
Eric W. Biederman881d9662007-09-17 11:56:21 -07002641 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642 goto out_dev;
Eric W. Biederman881d9662007-09-17 11:56:21 -07002643 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02002644 goto out_softnet;
Stephen Hemminger0e1256f2007-03-12 14:35:37 -07002645
Eric W. Biederman881d9662007-09-17 11:56:21 -07002646 if (wext_proc_init(net))
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02002647 goto out_ptype;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002648 rc = 0;
2649out:
2650 return rc;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02002651out_ptype:
Eric W. Biederman881d9662007-09-17 11:56:21 -07002652 proc_net_remove(net, "ptype");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002653out_softnet:
Eric W. Biederman881d9662007-09-17 11:56:21 -07002654 proc_net_remove(net, "softnet_stat");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655out_dev:
Eric W. Biederman881d9662007-09-17 11:56:21 -07002656 proc_net_remove(net, "dev");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657 goto out;
2658}
Eric W. Biederman881d9662007-09-17 11:56:21 -07002659
2660static void dev_proc_net_exit(struct net *net)
2661{
2662 wext_proc_exit(net);
2663
2664 proc_net_remove(net, "ptype");
2665 proc_net_remove(net, "softnet_stat");
2666 proc_net_remove(net, "dev");
2667}
2668
2669static struct pernet_operations dev_proc_ops = {
2670 .init = dev_proc_net_init,
2671 .exit = dev_proc_net_exit,
2672};
2673
2674static int __init dev_proc_init(void)
2675{
2676 return register_pernet_subsys(&dev_proc_ops);
2677}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002678#else
2679#define dev_proc_init() 0
2680#endif /* CONFIG_PROC_FS */
2681
2682
2683/**
2684 * netdev_set_master - set up master/slave pair
2685 * @slave: slave device
2686 * @master: new master device
2687 *
2688 * Changes the master device of the slave. Pass %NULL to break the
2689 * bonding. The caller must hold the RTNL semaphore. On a failure
2690 * a negative errno code is returned. On success the reference counts
2691 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2692 * function returns zero.
2693 */
2694int netdev_set_master(struct net_device *slave, struct net_device *master)
2695{
2696 struct net_device *old = slave->master;
2697
2698 ASSERT_RTNL();
2699
2700 if (master) {
2701 if (old)
2702 return -EBUSY;
2703 dev_hold(master);
2704 }
2705
2706 slave->master = master;
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002707
Linus Torvalds1da177e2005-04-16 15:20:36 -07002708 synchronize_net();
2709
2710 if (old)
2711 dev_put(old);
2712
2713 if (master)
2714 slave->flags |= IFF_SLAVE;
2715 else
2716 slave->flags &= ~IFF_SLAVE;
2717
2718 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2719 return 0;
2720}
2721
Patrick McHardy4417da62007-06-27 01:28:10 -07002722static void __dev_set_promiscuity(struct net_device *dev, int inc)
2723{
2724 unsigned short old_flags = dev->flags;
2725
Patrick McHardy24023452007-07-14 18:51:31 -07002726 ASSERT_RTNL();
2727
Patrick McHardy4417da62007-06-27 01:28:10 -07002728 if ((dev->promiscuity += inc) == 0)
2729 dev->flags &= ~IFF_PROMISC;
2730 else
2731 dev->flags |= IFF_PROMISC;
2732 if (dev->flags != old_flags) {
2733 printk(KERN_INFO "device %s %s promiscuous mode\n",
2734 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2735 "left");
2736 audit_log(current->audit_context, GFP_ATOMIC,
2737 AUDIT_ANOM_PROMISCUOUS,
2738 "dev=%s prom=%d old_prom=%d auid=%u",
2739 dev->name, (dev->flags & IFF_PROMISC),
2740 (old_flags & IFF_PROMISC),
2741 audit_get_loginuid(current->audit_context));
Patrick McHardy24023452007-07-14 18:51:31 -07002742
2743 if (dev->change_rx_flags)
2744 dev->change_rx_flags(dev, IFF_PROMISC);
Patrick McHardy4417da62007-06-27 01:28:10 -07002745 }
2746}
2747
Linus Torvalds1da177e2005-04-16 15:20:36 -07002748/**
2749 * dev_set_promiscuity - update promiscuity count on a device
2750 * @dev: device
2751 * @inc: modifier
2752 *
Stephen Hemminger3041a062006-05-26 13:25:24 -07002753 * Add or remove promiscuity from a device. While the count in the device
Linus Torvalds1da177e2005-04-16 15:20:36 -07002754 * remains above zero the interface remains promiscuous. Once it hits zero
2755 * the device reverts back to normal filtering operation. A negative inc
2756 * value is used to drop promiscuity on the device.
2757 */
2758void dev_set_promiscuity(struct net_device *dev, int inc)
2759{
2760 unsigned short old_flags = dev->flags;
2761
Patrick McHardy4417da62007-06-27 01:28:10 -07002762 __dev_set_promiscuity(dev, inc);
2763 if (dev->flags != old_flags)
2764 dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002765}
2766
2767/**
2768 * dev_set_allmulti - update allmulti count on a device
2769 * @dev: device
2770 * @inc: modifier
2771 *
2772 * Add or remove reception of all multicast frames to a device. While the
2773 * count in the device remains above zero the interface remains listening
2774 * to all interfaces. Once it hits zero the device reverts back to normal
2775 * filtering operation. A negative @inc value is used to drop the counter
2776 * when releasing a resource needing all multicasts.
2777 */
2778
2779void dev_set_allmulti(struct net_device *dev, int inc)
2780{
2781 unsigned short old_flags = dev->flags;
2782
Patrick McHardy24023452007-07-14 18:51:31 -07002783 ASSERT_RTNL();
2784
Linus Torvalds1da177e2005-04-16 15:20:36 -07002785 dev->flags |= IFF_ALLMULTI;
2786 if ((dev->allmulti += inc) == 0)
2787 dev->flags &= ~IFF_ALLMULTI;
Patrick McHardy24023452007-07-14 18:51:31 -07002788 if (dev->flags ^ old_flags) {
2789 if (dev->change_rx_flags)
2790 dev->change_rx_flags(dev, IFF_ALLMULTI);
Patrick McHardy4417da62007-06-27 01:28:10 -07002791 dev_set_rx_mode(dev);
Patrick McHardy24023452007-07-14 18:51:31 -07002792 }
Patrick McHardy4417da62007-06-27 01:28:10 -07002793}
2794
2795/*
2796 * Upload unicast and multicast address lists to device and
2797 * configure RX filtering. When the device doesn't support unicast
2798 * filtering it is put in promiscous mode while unicast addresses
2799 * are present.
2800 */
2801void __dev_set_rx_mode(struct net_device *dev)
2802{
2803 /* dev_open will call this function so the list will stay sane. */
2804 if (!(dev->flags&IFF_UP))
2805 return;
2806
2807 if (!netif_device_present(dev))
YOSHIFUJI Hideaki40b77c92007-07-19 10:43:23 +09002808 return;
Patrick McHardy4417da62007-06-27 01:28:10 -07002809
2810 if (dev->set_rx_mode)
2811 dev->set_rx_mode(dev);
2812 else {
2813 /* Unicast addresses changes may only happen under the rtnl,
2814 * therefore calling __dev_set_promiscuity here is safe.
2815 */
2816 if (dev->uc_count > 0 && !dev->uc_promisc) {
2817 __dev_set_promiscuity(dev, 1);
2818 dev->uc_promisc = 1;
2819 } else if (dev->uc_count == 0 && dev->uc_promisc) {
2820 __dev_set_promiscuity(dev, -1);
2821 dev->uc_promisc = 0;
2822 }
2823
2824 if (dev->set_multicast_list)
2825 dev->set_multicast_list(dev);
2826 }
2827}
2828
2829void dev_set_rx_mode(struct net_device *dev)
2830{
2831 netif_tx_lock_bh(dev);
2832 __dev_set_rx_mode(dev);
2833 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002834}
2835
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07002836int __dev_addr_delete(struct dev_addr_list **list, int *count,
2837 void *addr, int alen, int glbl)
Patrick McHardybf742482007-06-27 01:26:19 -07002838{
2839 struct dev_addr_list *da;
2840
2841 for (; (da = *list) != NULL; list = &da->next) {
2842 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2843 alen == da->da_addrlen) {
2844 if (glbl) {
2845 int old_glbl = da->da_gusers;
2846 da->da_gusers = 0;
2847 if (old_glbl == 0)
2848 break;
2849 }
2850 if (--da->da_users)
2851 return 0;
2852
2853 *list = da->next;
2854 kfree(da);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07002855 (*count)--;
Patrick McHardybf742482007-06-27 01:26:19 -07002856 return 0;
2857 }
2858 }
2859 return -ENOENT;
2860}
2861
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07002862int __dev_addr_add(struct dev_addr_list **list, int *count,
2863 void *addr, int alen, int glbl)
Patrick McHardybf742482007-06-27 01:26:19 -07002864{
2865 struct dev_addr_list *da;
2866
2867 for (da = *list; da != NULL; da = da->next) {
2868 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2869 da->da_addrlen == alen) {
2870 if (glbl) {
2871 int old_glbl = da->da_gusers;
2872 da->da_gusers = 1;
2873 if (old_glbl)
2874 return 0;
2875 }
2876 da->da_users++;
2877 return 0;
2878 }
2879 }
2880
2881 da = kmalloc(sizeof(*da), GFP_ATOMIC);
2882 if (da == NULL)
2883 return -ENOMEM;
2884 memcpy(da->da_addr, addr, alen);
2885 da->da_addrlen = alen;
2886 da->da_users = 1;
2887 da->da_gusers = glbl ? 1 : 0;
2888 da->next = *list;
2889 *list = da;
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07002890 (*count)++;
Patrick McHardybf742482007-06-27 01:26:19 -07002891 return 0;
2892}
2893
Patrick McHardy4417da62007-06-27 01:28:10 -07002894/**
2895 * dev_unicast_delete - Release secondary unicast address.
2896 * @dev: device
Randy Dunlap0ed72ec2007-07-26 00:03:29 -07002897 * @addr: address to delete
2898 * @alen: length of @addr
Patrick McHardy4417da62007-06-27 01:28:10 -07002899 *
2900 * Release reference to a secondary unicast address and remove it
Randy Dunlap0ed72ec2007-07-26 00:03:29 -07002901 * from the device if the reference count drops to zero.
Patrick McHardy4417da62007-06-27 01:28:10 -07002902 *
2903 * The caller must hold the rtnl_mutex.
2904 */
2905int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
2906{
2907 int err;
2908
2909 ASSERT_RTNL();
2910
2911 netif_tx_lock_bh(dev);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07002912 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
2913 if (!err)
Patrick McHardy4417da62007-06-27 01:28:10 -07002914 __dev_set_rx_mode(dev);
Patrick McHardy4417da62007-06-27 01:28:10 -07002915 netif_tx_unlock_bh(dev);
2916 return err;
2917}
2918EXPORT_SYMBOL(dev_unicast_delete);
2919
2920/**
2921 * dev_unicast_add - add a secondary unicast address
2922 * @dev: device
Randy Dunlap0ed72ec2007-07-26 00:03:29 -07002923 * @addr: address to delete
2924 * @alen: length of @addr
Patrick McHardy4417da62007-06-27 01:28:10 -07002925 *
2926 * Add a secondary unicast address to the device or increase
2927 * the reference count if it already exists.
2928 *
2929 * The caller must hold the rtnl_mutex.
2930 */
2931int dev_unicast_add(struct net_device *dev, void *addr, int alen)
2932{
2933 int err;
2934
2935 ASSERT_RTNL();
2936
2937 netif_tx_lock_bh(dev);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -07002938 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
2939 if (!err)
Patrick McHardy4417da62007-06-27 01:28:10 -07002940 __dev_set_rx_mode(dev);
Patrick McHardy4417da62007-06-27 01:28:10 -07002941 netif_tx_unlock_bh(dev);
2942 return err;
2943}
2944EXPORT_SYMBOL(dev_unicast_add);
2945
Denis Cheng12972622007-07-18 02:12:56 -07002946static void __dev_addr_discard(struct dev_addr_list **list)
2947{
2948 struct dev_addr_list *tmp;
2949
2950 while (*list != NULL) {
2951 tmp = *list;
2952 *list = tmp->next;
2953 if (tmp->da_users > tmp->da_gusers)
2954 printk("__dev_addr_discard: address leakage! "
2955 "da_users=%d\n", tmp->da_users);
2956 kfree(tmp);
2957 }
2958}
2959
Denis Cheng26cc2522007-07-18 02:12:03 -07002960static void dev_addr_discard(struct net_device *dev)
Patrick McHardy4417da62007-06-27 01:28:10 -07002961{
2962 netif_tx_lock_bh(dev);
Denis Cheng26cc2522007-07-18 02:12:03 -07002963
Patrick McHardy4417da62007-06-27 01:28:10 -07002964 __dev_addr_discard(&dev->uc_list);
2965 dev->uc_count = 0;
Patrick McHardy4417da62007-06-27 01:28:10 -07002966
Denis Cheng456ad752007-07-18 02:10:54 -07002967 __dev_addr_discard(&dev->mc_list);
2968 dev->mc_count = 0;
Denis Cheng26cc2522007-07-18 02:12:03 -07002969
Denis Cheng456ad752007-07-18 02:10:54 -07002970 netif_tx_unlock_bh(dev);
2971}
2972
Linus Torvalds1da177e2005-04-16 15:20:36 -07002973unsigned dev_get_flags(const struct net_device *dev)
2974{
2975 unsigned flags;
2976
2977 flags = (dev->flags & ~(IFF_PROMISC |
2978 IFF_ALLMULTI |
Stefan Rompfb00055a2006-03-20 17:09:11 -08002979 IFF_RUNNING |
2980 IFF_LOWER_UP |
2981 IFF_DORMANT)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -07002982 (dev->gflags & (IFF_PROMISC |
2983 IFF_ALLMULTI));
2984
Stefan Rompfb00055a2006-03-20 17:09:11 -08002985 if (netif_running(dev)) {
2986 if (netif_oper_up(dev))
2987 flags |= IFF_RUNNING;
2988 if (netif_carrier_ok(dev))
2989 flags |= IFF_LOWER_UP;
2990 if (netif_dormant(dev))
2991 flags |= IFF_DORMANT;
2992 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993
2994 return flags;
2995}
2996
2997int dev_change_flags(struct net_device *dev, unsigned flags)
2998{
Thomas Graf7c355f52007-06-05 16:03:03 -07002999 int ret, changes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003000 int old_flags = dev->flags;
3001
Patrick McHardy24023452007-07-14 18:51:31 -07003002 ASSERT_RTNL();
3003
Linus Torvalds1da177e2005-04-16 15:20:36 -07003004 /*
3005 * Set the flags on our device.
3006 */
3007
3008 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3009 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3010 IFF_AUTOMEDIA)) |
3011 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3012 IFF_ALLMULTI));
3013
3014 /*
3015 * Load in the correct multicast list now the flags have changed.
3016 */
3017
Patrick McHardy24023452007-07-14 18:51:31 -07003018 if (dev->change_rx_flags && (dev->flags ^ flags) & IFF_MULTICAST)
3019 dev->change_rx_flags(dev, IFF_MULTICAST);
3020
Patrick McHardy4417da62007-06-27 01:28:10 -07003021 dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003022
3023 /*
3024 * Have we downed the interface. We handle IFF_UP ourselves
3025 * according to user attempts to set it, rather than blindly
3026 * setting it.
3027 */
3028
3029 ret = 0;
3030 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3031 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3032
3033 if (!ret)
Patrick McHardy4417da62007-06-27 01:28:10 -07003034 dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003035 }
3036
3037 if (dev->flags & IFF_UP &&
3038 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3039 IFF_VOLATILE)))
Alan Sternf07d5b92006-05-09 15:23:03 -07003040 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -08003041 NETDEV_CHANGE, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003042
3043 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3044 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3045 dev->gflags ^= IFF_PROMISC;
3046 dev_set_promiscuity(dev, inc);
3047 }
3048
3049 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3050 is important. Some (broken) drivers set IFF_PROMISC, when
3051 IFF_ALLMULTI is requested not asking us and not reporting.
3052 */
3053 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3054 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3055 dev->gflags ^= IFF_ALLMULTI;
3056 dev_set_allmulti(dev, inc);
3057 }
3058
Thomas Graf7c355f52007-06-05 16:03:03 -07003059 /* Exclude state transition flags, already notified */
3060 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3061 if (changes)
3062 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063
3064 return ret;
3065}
3066
3067int dev_set_mtu(struct net_device *dev, int new_mtu)
3068{
3069 int err;
3070
3071 if (new_mtu == dev->mtu)
3072 return 0;
3073
3074 /* MTU must be positive. */
3075 if (new_mtu < 0)
3076 return -EINVAL;
3077
3078 if (!netif_device_present(dev))
3079 return -ENODEV;
3080
3081 err = 0;
3082 if (dev->change_mtu)
3083 err = dev->change_mtu(dev, new_mtu);
3084 else
3085 dev->mtu = new_mtu;
3086 if (!err && dev->flags & IFF_UP)
Alan Sternf07d5b92006-05-09 15:23:03 -07003087 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -08003088 NETDEV_CHANGEMTU, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003089 return err;
3090}
3091
3092int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3093{
3094 int err;
3095
3096 if (!dev->set_mac_address)
3097 return -EOPNOTSUPP;
3098 if (sa->sa_family != dev->type)
3099 return -EINVAL;
3100 if (!netif_device_present(dev))
3101 return -ENODEV;
3102 err = dev->set_mac_address(dev, sa);
3103 if (!err)
Alan Sternf07d5b92006-05-09 15:23:03 -07003104 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -08003105 NETDEV_CHANGEADDR, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003106 return err;
3107}
3108
3109/*
3110 * Perform the SIOCxIFxxx calls.
3111 */
Eric W. Biederman881d9662007-09-17 11:56:21 -07003112static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003113{
3114 int err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07003115 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003116
3117 if (!dev)
3118 return -ENODEV;
3119
3120 switch (cmd) {
3121 case SIOCGIFFLAGS: /* Get interface flags */
3122 ifr->ifr_flags = dev_get_flags(dev);
3123 return 0;
3124
3125 case SIOCSIFFLAGS: /* Set interface flags */
3126 return dev_change_flags(dev, ifr->ifr_flags);
3127
3128 case SIOCGIFMETRIC: /* Get the metric on the interface
3129 (currently unused) */
3130 ifr->ifr_metric = 0;
3131 return 0;
3132
3133 case SIOCSIFMETRIC: /* Set the metric on the interface
3134 (currently unused) */
3135 return -EOPNOTSUPP;
3136
3137 case SIOCGIFMTU: /* Get the MTU of a device */
3138 ifr->ifr_mtu = dev->mtu;
3139 return 0;
3140
3141 case SIOCSIFMTU: /* Set the MTU of a device */
3142 return dev_set_mtu(dev, ifr->ifr_mtu);
3143
3144 case SIOCGIFHWADDR:
3145 if (!dev->addr_len)
3146 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3147 else
3148 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3149 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3150 ifr->ifr_hwaddr.sa_family = dev->type;
3151 return 0;
3152
3153 case SIOCSIFHWADDR:
3154 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3155
3156 case SIOCSIFHWBROADCAST:
3157 if (ifr->ifr_hwaddr.sa_family != dev->type)
3158 return -EINVAL;
3159 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3160 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
Alan Sternf07d5b92006-05-09 15:23:03 -07003161 raw_notifier_call_chain(&netdev_chain,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003162 NETDEV_CHANGEADDR, dev);
3163 return 0;
3164
3165 case SIOCGIFMAP:
3166 ifr->ifr_map.mem_start = dev->mem_start;
3167 ifr->ifr_map.mem_end = dev->mem_end;
3168 ifr->ifr_map.base_addr = dev->base_addr;
3169 ifr->ifr_map.irq = dev->irq;
3170 ifr->ifr_map.dma = dev->dma;
3171 ifr->ifr_map.port = dev->if_port;
3172 return 0;
3173
3174 case SIOCSIFMAP:
3175 if (dev->set_config) {
3176 if (!netif_device_present(dev))
3177 return -ENODEV;
3178 return dev->set_config(dev, &ifr->ifr_map);
3179 }
3180 return -EOPNOTSUPP;
3181
3182 case SIOCADDMULTI:
3183 if (!dev->set_multicast_list ||
3184 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3185 return -EINVAL;
3186 if (!netif_device_present(dev))
3187 return -ENODEV;
3188 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3189 dev->addr_len, 1);
3190
3191 case SIOCDELMULTI:
3192 if (!dev->set_multicast_list ||
3193 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3194 return -EINVAL;
3195 if (!netif_device_present(dev))
3196 return -ENODEV;
3197 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3198 dev->addr_len, 1);
3199
3200 case SIOCGIFINDEX:
3201 ifr->ifr_ifindex = dev->ifindex;
3202 return 0;
3203
3204 case SIOCGIFTXQLEN:
3205 ifr->ifr_qlen = dev->tx_queue_len;
3206 return 0;
3207
3208 case SIOCSIFTXQLEN:
3209 if (ifr->ifr_qlen < 0)
3210 return -EINVAL;
3211 dev->tx_queue_len = ifr->ifr_qlen;
3212 return 0;
3213
3214 case SIOCSIFNAME:
3215 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3216 return dev_change_name(dev, ifr->ifr_newname);
3217
3218 /*
3219 * Unknown or private ioctl
3220 */
3221
3222 default:
3223 if ((cmd >= SIOCDEVPRIVATE &&
3224 cmd <= SIOCDEVPRIVATE + 15) ||
3225 cmd == SIOCBONDENSLAVE ||
3226 cmd == SIOCBONDRELEASE ||
3227 cmd == SIOCBONDSETHWADDR ||
3228 cmd == SIOCBONDSLAVEINFOQUERY ||
3229 cmd == SIOCBONDINFOQUERY ||
3230 cmd == SIOCBONDCHANGEACTIVE ||
3231 cmd == SIOCGMIIPHY ||
3232 cmd == SIOCGMIIREG ||
3233 cmd == SIOCSMIIREG ||
3234 cmd == SIOCBRADDIF ||
3235 cmd == SIOCBRDELIF ||
3236 cmd == SIOCWANDEV) {
3237 err = -EOPNOTSUPP;
3238 if (dev->do_ioctl) {
3239 if (netif_device_present(dev))
3240 err = dev->do_ioctl(dev, ifr,
3241 cmd);
3242 else
3243 err = -ENODEV;
3244 }
3245 } else
3246 err = -EINVAL;
3247
3248 }
3249 return err;
3250}
3251
3252/*
3253 * This function handles all "interface"-type I/O control requests. The actual
3254 * 'doing' part of this is dev_ifsioc above.
3255 */
3256
3257/**
3258 * dev_ioctl - network device ioctl
3259 * @cmd: command to issue
3260 * @arg: pointer to a struct ifreq in user space
3261 *
3262 * Issue ioctl functions to devices. This is normally called by the
3263 * user space syscall interfaces but can sometimes be useful for
3264 * other purposes. The return value is the return from the syscall if
3265 * positive or a negative errno code on error.
3266 */
3267
Eric W. Biederman881d9662007-09-17 11:56:21 -07003268int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003269{
3270 struct ifreq ifr;
3271 int ret;
3272 char *colon;
3273
3274 /* One special case: SIOCGIFCONF takes ifconf argument
3275 and requires shared lock, because it sleeps writing
3276 to user space.
3277 */
3278
3279 if (cmd == SIOCGIFCONF) {
Stephen Hemminger6756ae42006-03-20 22:23:58 -08003280 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07003281 ret = dev_ifconf(net, (char __user *) arg);
Stephen Hemminger6756ae42006-03-20 22:23:58 -08003282 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003283 return ret;
3284 }
3285 if (cmd == SIOCGIFNAME)
Eric W. Biederman881d9662007-09-17 11:56:21 -07003286 return dev_ifname(net, (struct ifreq __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003287
3288 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3289 return -EFAULT;
3290
3291 ifr.ifr_name[IFNAMSIZ-1] = 0;
3292
3293 colon = strchr(ifr.ifr_name, ':');
3294 if (colon)
3295 *colon = 0;
3296
3297 /*
3298 * See which interface the caller is talking about.
3299 */
3300
3301 switch (cmd) {
3302 /*
3303 * These ioctl calls:
3304 * - can be done by all.
3305 * - atomic and do not require locking.
3306 * - return a value
3307 */
3308 case SIOCGIFFLAGS:
3309 case SIOCGIFMETRIC:
3310 case SIOCGIFMTU:
3311 case SIOCGIFHWADDR:
3312 case SIOCGIFSLAVE:
3313 case SIOCGIFMAP:
3314 case SIOCGIFINDEX:
3315 case SIOCGIFTXQLEN:
Eric W. Biederman881d9662007-09-17 11:56:21 -07003316 dev_load(net, ifr.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003317 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -07003318 ret = dev_ifsioc(net, &ifr, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003319 read_unlock(&dev_base_lock);
3320 if (!ret) {
3321 if (colon)
3322 *colon = ':';
3323 if (copy_to_user(arg, &ifr,
3324 sizeof(struct ifreq)))
3325 ret = -EFAULT;
3326 }
3327 return ret;
3328
3329 case SIOCETHTOOL:
Eric W. Biederman881d9662007-09-17 11:56:21 -07003330 dev_load(net, ifr.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003331 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07003332 ret = dev_ethtool(net, &ifr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003333 rtnl_unlock();
3334 if (!ret) {
3335 if (colon)
3336 *colon = ':';
3337 if (copy_to_user(arg, &ifr,
3338 sizeof(struct ifreq)))
3339 ret = -EFAULT;
3340 }
3341 return ret;
3342
3343 /*
3344 * These ioctl calls:
3345 * - require superuser power.
3346 * - require strict serialization.
3347 * - return a value
3348 */
3349 case SIOCGMIIPHY:
3350 case SIOCGMIIREG:
3351 case SIOCSIFNAME:
3352 if (!capable(CAP_NET_ADMIN))
3353 return -EPERM;
Eric W. Biederman881d9662007-09-17 11:56:21 -07003354 dev_load(net, ifr.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003355 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07003356 ret = dev_ifsioc(net, &ifr, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003357 rtnl_unlock();
3358 if (!ret) {
3359 if (colon)
3360 *colon = ':';
3361 if (copy_to_user(arg, &ifr,
3362 sizeof(struct ifreq)))
3363 ret = -EFAULT;
3364 }
3365 return ret;
3366
3367 /*
3368 * These ioctl calls:
3369 * - require superuser power.
3370 * - require strict serialization.
3371 * - do not return a value
3372 */
3373 case SIOCSIFFLAGS:
3374 case SIOCSIFMETRIC:
3375 case SIOCSIFMTU:
3376 case SIOCSIFMAP:
3377 case SIOCSIFHWADDR:
3378 case SIOCSIFSLAVE:
3379 case SIOCADDMULTI:
3380 case SIOCDELMULTI:
3381 case SIOCSIFHWBROADCAST:
3382 case SIOCSIFTXQLEN:
3383 case SIOCSMIIREG:
3384 case SIOCBONDENSLAVE:
3385 case SIOCBONDRELEASE:
3386 case SIOCBONDSETHWADDR:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003387 case SIOCBONDCHANGEACTIVE:
3388 case SIOCBRADDIF:
3389 case SIOCBRDELIF:
3390 if (!capable(CAP_NET_ADMIN))
3391 return -EPERM;
Thomas Grafcabcac02006-01-24 12:46:33 -08003392 /* fall through */
3393 case SIOCBONDSLAVEINFOQUERY:
3394 case SIOCBONDINFOQUERY:
Eric W. Biederman881d9662007-09-17 11:56:21 -07003395 dev_load(net, ifr.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003396 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07003397 ret = dev_ifsioc(net, &ifr, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003398 rtnl_unlock();
3399 return ret;
3400
3401 case SIOCGIFMEM:
3402 /* Get the per device memory space. We can add this but
3403 * currently do not support it */
3404 case SIOCSIFMEM:
3405 /* Set the per device memory buffer space.
3406 * Not applicable in our case */
3407 case SIOCSIFLINK:
3408 return -EINVAL;
3409
3410 /*
3411 * Unknown or private ioctl.
3412 */
3413 default:
3414 if (cmd == SIOCWANDEV ||
3415 (cmd >= SIOCDEVPRIVATE &&
3416 cmd <= SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07003417 dev_load(net, ifr.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003418 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07003419 ret = dev_ifsioc(net, &ifr, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003420 rtnl_unlock();
3421 if (!ret && copy_to_user(arg, &ifr,
3422 sizeof(struct ifreq)))
3423 ret = -EFAULT;
3424 return ret;
3425 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003426 /* Take care of Wireless Extensions */
Johannes Berg295f4a12007-04-26 20:43:56 -07003427 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
Eric W. Biederman881d9662007-09-17 11:56:21 -07003428 return wext_handle_ioctl(net, &ifr, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003429 return -EINVAL;
3430 }
3431}
3432
3433
3434/**
3435 * dev_new_index - allocate an ifindex
3436 *
3437 * Returns a suitable unique value for a new device interface
3438 * number. The caller must hold the rtnl semaphore or the
3439 * dev_base_lock to be sure it remains unique.
3440 */
Eric W. Biederman881d9662007-09-17 11:56:21 -07003441static int dev_new_index(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003442{
3443 static int ifindex;
3444 for (;;) {
3445 if (++ifindex <= 0)
3446 ifindex = 1;
Eric W. Biederman881d9662007-09-17 11:56:21 -07003447 if (!__dev_get_by_index(net, ifindex))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003448 return ifindex;
3449 }
3450}
3451
Linus Torvalds1da177e2005-04-16 15:20:36 -07003452/* Delayed registration/unregisteration */
3453static DEFINE_SPINLOCK(net_todo_list_lock);
3454static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
3455
Stephen Hemminger6f05f622007-03-08 20:46:03 -08003456static void net_set_todo(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003457{
3458 spin_lock(&net_todo_list_lock);
3459 list_add_tail(&dev->todo_list, &net_todo_list);
3460 spin_unlock(&net_todo_list_lock);
3461}
3462
3463/**
3464 * register_netdevice - register a network device
3465 * @dev: device to register
3466 *
3467 * Take a completed network device structure and add it to the kernel
3468 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3469 * chain. 0 is returned on success. A negative errno code is returned
3470 * on a failure to set up the device, or if the name is a duplicate.
3471 *
3472 * Callers must hold the rtnl semaphore. You may want
3473 * register_netdev() instead of this.
3474 *
3475 * BUGS:
3476 * The locking appears insufficient to guarantee two parallel registers
3477 * will not get the same name.
3478 */
3479
3480int register_netdevice(struct net_device *dev)
3481{
3482 struct hlist_head *head;
3483 struct hlist_node *p;
3484 int ret;
Eric W. Biederman881d9662007-09-17 11:56:21 -07003485 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003486
3487 BUG_ON(dev_boot_phase);
3488 ASSERT_RTNL();
3489
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003490 might_sleep();
3491
Linus Torvalds1da177e2005-04-16 15:20:36 -07003492 /* When net_device's are persistent, this will be fatal. */
3493 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
Eric W. Biederman881d9662007-09-17 11:56:21 -07003494 BUG_ON(!dev->nd_net);
3495 net = dev->nd_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003496
3497 spin_lock_init(&dev->queue_lock);
Herbert Xu932ff272006-06-09 12:20:56 -07003498 spin_lock_init(&dev->_xmit_lock);
Jarek Poplawski723e98b2007-05-15 22:46:18 -07003499 netdev_set_lockdep_class(&dev->_xmit_lock, dev->type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003500 dev->xmit_lock_owner = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003501 spin_lock_init(&dev->ingress_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003502
Linus Torvalds1da177e2005-04-16 15:20:36 -07003503 dev->iflink = -1;
3504
3505 /* Init, if this function is available */
3506 if (dev->init) {
3507 ret = dev->init(dev);
3508 if (ret) {
3509 if (ret > 0)
3510 ret = -EIO;
Adrian Bunk90833aa2006-11-13 16:02:22 -08003511 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003512 }
3513 }
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003514
Linus Torvalds1da177e2005-04-16 15:20:36 -07003515 if (!dev_valid_name(dev->name)) {
3516 ret = -EINVAL;
Herbert Xu7ce1b0e2007-07-30 16:29:40 -07003517 goto err_uninit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003518 }
3519
Eric W. Biederman881d9662007-09-17 11:56:21 -07003520 dev->ifindex = dev_new_index(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003521 if (dev->iflink == -1)
3522 dev->iflink = dev->ifindex;
3523
3524 /* Check for existence of name */
Eric W. Biederman881d9662007-09-17 11:56:21 -07003525 head = dev_name_hash(net, dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003526 hlist_for_each(p, head) {
3527 struct net_device *d
3528 = hlist_entry(p, struct net_device, name_hlist);
3529 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3530 ret = -EEXIST;
Herbert Xu7ce1b0e2007-07-30 16:29:40 -07003531 goto err_uninit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003532 }
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003533 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003534
Stephen Hemmingerd212f872007-06-27 00:47:37 -07003535 /* Fix illegal checksum combinations */
3536 if ((dev->features & NETIF_F_HW_CSUM) &&
3537 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3538 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
3539 dev->name);
3540 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3541 }
3542
3543 if ((dev->features & NETIF_F_NO_CSUM) &&
3544 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3545 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
3546 dev->name);
3547 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
3548 }
3549
3550
Linus Torvalds1da177e2005-04-16 15:20:36 -07003551 /* Fix illegal SG+CSUM combinations. */
3552 if ((dev->features & NETIF_F_SG) &&
Herbert Xu8648b302006-06-17 22:06:05 -07003553 !(dev->features & NETIF_F_ALL_CSUM)) {
Stephen Hemminger5a8da022006-07-07 16:54:05 -07003554 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003555 dev->name);
3556 dev->features &= ~NETIF_F_SG;
3557 }
3558
3559 /* TSO requires that SG is present as well. */
3560 if ((dev->features & NETIF_F_TSO) &&
3561 !(dev->features & NETIF_F_SG)) {
Stephen Hemminger5a8da022006-07-07 16:54:05 -07003562 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003563 dev->name);
3564 dev->features &= ~NETIF_F_TSO;
3565 }
Ananda Rajue89e9cf2005-10-18 15:46:41 -07003566 if (dev->features & NETIF_F_UFO) {
3567 if (!(dev->features & NETIF_F_HW_CSUM)) {
3568 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3569 "NETIF_F_HW_CSUM feature.\n",
3570 dev->name);
3571 dev->features &= ~NETIF_F_UFO;
3572 }
3573 if (!(dev->features & NETIF_F_SG)) {
3574 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3575 "NETIF_F_SG feature.\n",
3576 dev->name);
3577 dev->features &= ~NETIF_F_UFO;
3578 }
3579 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003580
3581 /*
3582 * nil rebuild_header routine,
3583 * that should be never called and used as just bug trap.
3584 */
3585
3586 if (!dev->rebuild_header)
3587 dev->rebuild_header = default_rebuild_header;
3588
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003589 ret = netdev_register_sysfs(dev);
3590 if (ret)
Herbert Xu7ce1b0e2007-07-30 16:29:40 -07003591 goto err_uninit;
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003592 dev->reg_state = NETREG_REGISTERED;
3593
Linus Torvalds1da177e2005-04-16 15:20:36 -07003594 /*
3595 * Default initial state at registry is that the
3596 * device is present.
3597 */
3598
3599 set_bit(__LINK_STATE_PRESENT, &dev->state);
3600
Linus Torvalds1da177e2005-04-16 15:20:36 -07003601 dev_init_scheduler(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003602 dev_hold(dev);
Eric W. Biedermance286d32007-09-12 13:53:49 +02003603 list_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003604
3605 /* Notify protocols, that a new device appeared. */
Herbert Xufcc5a032007-07-30 17:03:38 -07003606 ret = raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
3607 ret = notifier_to_errno(ret);
3608 if (ret)
3609 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003610
3611out:
3612 return ret;
Herbert Xu7ce1b0e2007-07-30 16:29:40 -07003613
3614err_uninit:
3615 if (dev->uninit)
3616 dev->uninit(dev);
3617 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003618}
3619
3620/**
3621 * register_netdev - register a network device
3622 * @dev: device to register
3623 *
3624 * Take a completed network device structure and add it to the kernel
3625 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3626 * chain. 0 is returned on success. A negative errno code is returned
3627 * on a failure to set up the device, or if the name is a duplicate.
3628 *
Borislav Petkov38b4da32007-04-20 22:14:10 -07003629 * This is a wrapper around register_netdevice that takes the rtnl semaphore
Linus Torvalds1da177e2005-04-16 15:20:36 -07003630 * and expands the device name if you passed a format string to
3631 * alloc_netdev.
3632 */
3633int register_netdev(struct net_device *dev)
3634{
3635 int err;
3636
3637 rtnl_lock();
3638
3639 /*
3640 * If the name is a format string the caller wants us to do a
3641 * name allocation.
3642 */
3643 if (strchr(dev->name, '%')) {
3644 err = dev_alloc_name(dev, dev->name);
3645 if (err < 0)
3646 goto out;
3647 }
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003648
Linus Torvalds1da177e2005-04-16 15:20:36 -07003649 err = register_netdevice(dev);
3650out:
3651 rtnl_unlock();
3652 return err;
3653}
3654EXPORT_SYMBOL(register_netdev);
3655
3656/*
3657 * netdev_wait_allrefs - wait until all references are gone.
3658 *
3659 * This is called when unregistering network devices.
3660 *
3661 * Any protocol or device that holds a reference should register
3662 * for netdevice notification, and cleanup and put back the
3663 * reference if they receive an UNREGISTER event.
3664 * We can get stuck here if buggy protocols don't correctly
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003665 * call dev_put.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003666 */
3667static void netdev_wait_allrefs(struct net_device *dev)
3668{
3669 unsigned long rebroadcast_time, warning_time;
3670
3671 rebroadcast_time = warning_time = jiffies;
3672 while (atomic_read(&dev->refcnt) != 0) {
3673 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
Stephen Hemminger6756ae42006-03-20 22:23:58 -08003674 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003675
3676 /* Rebroadcast unregister notification */
Alan Sternf07d5b92006-05-09 15:23:03 -07003677 raw_notifier_call_chain(&netdev_chain,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003678 NETDEV_UNREGISTER, dev);
3679
3680 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3681 &dev->state)) {
3682 /* We must not have linkwatch events
3683 * pending on unregister. If this
3684 * happens, we simply run the queue
3685 * unscheduled, resulting in a noop
3686 * for this device.
3687 */
3688 linkwatch_run_queue();
3689 }
3690
Stephen Hemminger6756ae42006-03-20 22:23:58 -08003691 __rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003692
3693 rebroadcast_time = jiffies;
3694 }
3695
3696 msleep(250);
3697
3698 if (time_after(jiffies, warning_time + 10 * HZ)) {
3699 printk(KERN_EMERG "unregister_netdevice: "
3700 "waiting for %s to become free. Usage "
3701 "count = %d\n",
3702 dev->name, atomic_read(&dev->refcnt));
3703 warning_time = jiffies;
3704 }
3705 }
3706}
3707
3708/* The sequence is:
3709 *
3710 * rtnl_lock();
3711 * ...
3712 * register_netdevice(x1);
3713 * register_netdevice(x2);
3714 * ...
3715 * unregister_netdevice(y1);
3716 * unregister_netdevice(y2);
3717 * ...
3718 * rtnl_unlock();
3719 * free_netdev(y1);
3720 * free_netdev(y2);
3721 *
3722 * We are invoked by rtnl_unlock() after it drops the semaphore.
3723 * This allows us to deal with problems:
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003724 * 1) We can delete sysfs objects which invoke hotplug
Linus Torvalds1da177e2005-04-16 15:20:36 -07003725 * without deadlocking with linkwatch via keventd.
3726 * 2) Since we run with the RTNL semaphore not held, we can sleep
3727 * safely in order to wait for the netdev refcnt to drop to zero.
3728 */
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08003729static DEFINE_MUTEX(net_todo_run_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003730void netdev_run_todo(void)
3731{
Oleg Nesterov626ab0e2006-06-23 02:05:55 -07003732 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003733
3734 /* Need to guard against multiple cpu's getting out of order. */
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08003735 mutex_lock(&net_todo_run_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003736
3737 /* Not safe to do outside the semaphore. We must not return
3738 * until all unregister events invoked by the local processor
3739 * have been completed (either by this todo run, or one on
3740 * another cpu).
3741 */
3742 if (list_empty(&net_todo_list))
3743 goto out;
3744
3745 /* Snapshot list, allow later requests */
3746 spin_lock(&net_todo_list_lock);
Oleg Nesterov626ab0e2006-06-23 02:05:55 -07003747 list_replace_init(&net_todo_list, &list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003748 spin_unlock(&net_todo_list_lock);
Oleg Nesterov626ab0e2006-06-23 02:05:55 -07003749
Linus Torvalds1da177e2005-04-16 15:20:36 -07003750 while (!list_empty(&list)) {
3751 struct net_device *dev
3752 = list_entry(list.next, struct net_device, todo_list);
3753 list_del(&dev->todo_list);
3754
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003755 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003756 printk(KERN_ERR "network todo '%s' but state %d\n",
3757 dev->name, dev->reg_state);
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003758 dump_stack();
3759 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003760 }
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003761
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003762 dev->reg_state = NETREG_UNREGISTERED;
3763
3764 netdev_wait_allrefs(dev);
3765
3766 /* paranoia */
3767 BUG_ON(atomic_read(&dev->refcnt));
3768 BUG_TRAP(!dev->ip_ptr);
3769 BUG_TRAP(!dev->ip6_ptr);
3770 BUG_TRAP(!dev->dn_ptr);
3771
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003772 if (dev->destructor)
3773 dev->destructor(dev);
Stephen Hemminger9093bbb2007-05-19 15:39:25 -07003774
3775 /* Free network device */
3776 kobject_put(&dev->dev.kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003777 }
3778
3779out:
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08003780 mutex_unlock(&net_todo_run_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003781}
3782
Rusty Russell5a1b5892007-04-28 21:04:03 -07003783static struct net_device_stats *internal_stats(struct net_device *dev)
Rusty Russellc45d2862007-03-28 14:29:08 -07003784{
Rusty Russell5a1b5892007-04-28 21:04:03 -07003785 return &dev->stats;
Rusty Russellc45d2862007-03-28 14:29:08 -07003786}
3787
Linus Torvalds1da177e2005-04-16 15:20:36 -07003788/**
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003789 * alloc_netdev_mq - allocate network device
Linus Torvalds1da177e2005-04-16 15:20:36 -07003790 * @sizeof_priv: size of private data to allocate space for
3791 * @name: device name format string
3792 * @setup: callback to initialize device
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003793 * @queue_count: the number of subqueues to allocate
Linus Torvalds1da177e2005-04-16 15:20:36 -07003794 *
3795 * Allocates a struct net_device with private data area for driver use
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003796 * and performs basic initialization. Also allocates subquue structs
3797 * for each queue on the device at the end of the netdevice.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003798 */
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003799struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
3800 void (*setup)(struct net_device *), unsigned int queue_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003801{
3802 void *p;
3803 struct net_device *dev;
3804 int alloc_size;
3805
Stephen Hemmingerb6fe17d2006-08-29 17:06:13 -07003806 BUG_ON(strlen(name) >= sizeof(dev->name));
3807
Linus Torvalds1da177e2005-04-16 15:20:36 -07003808 /* ensure 32-byte alignment of both the device and private area */
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003809 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST +
Patrick McHardy31ce72a2007-07-20 19:45:45 -07003810 (sizeof(struct net_device_subqueue) * (queue_count - 1))) &
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003811 ~NETDEV_ALIGN_CONST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003812 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3813
Paolo 'Blaisorblade' Giarrusso31380de2006-04-06 22:38:28 -07003814 p = kzalloc(alloc_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003815 if (!p) {
Stephen Hemmingerb6fe17d2006-08-29 17:06:13 -07003816 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003817 return NULL;
3818 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003819
3820 dev = (struct net_device *)
3821 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3822 dev->padded = (char *)dev - (char *)p;
Eric W. Biederman6d34b1c2007-09-12 12:57:33 +02003823 dev->nd_net = &init_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003824
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003825 if (sizeof_priv) {
3826 dev->priv = ((char *)dev +
3827 ((sizeof(struct net_device) +
3828 (sizeof(struct net_device_subqueue) *
Patrick McHardy31ce72a2007-07-20 19:45:45 -07003829 (queue_count - 1)) + NETDEV_ALIGN_CONST)
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003830 & ~NETDEV_ALIGN_CONST));
3831 }
3832
3833 dev->egress_subqueue_count = queue_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003834
Rusty Russell5a1b5892007-04-28 21:04:03 -07003835 dev->get_stats = internal_stats;
Stephen Hemmingerbea33482007-10-03 16:41:36 -07003836 netpoll_netdev_init(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003837 setup(dev);
3838 strcpy(dev->name, name);
3839 return dev;
3840}
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -07003841EXPORT_SYMBOL(alloc_netdev_mq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003842
3843/**
3844 * free_netdev - free network device
3845 * @dev: device
3846 *
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003847 * This function does the last stage of destroying an allocated device
3848 * interface. The reference to the device object is released.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003849 * If this is the last reference then it will be freed.
3850 */
3851void free_netdev(struct net_device *dev)
3852{
3853#ifdef CONFIG_SYSFS
Stephen Hemminger3041a062006-05-26 13:25:24 -07003854 /* Compatibility with error handling in drivers */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003855 if (dev->reg_state == NETREG_UNINITIALIZED) {
3856 kfree((char *)dev - dev->padded);
3857 return;
3858 }
3859
3860 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3861 dev->reg_state = NETREG_RELEASED;
3862
Greg Kroah-Hartman43cb76d2002-04-09 12:14:34 -07003863 /* will free via device release */
3864 put_device(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003865#else
3866 kfree((char *)dev - dev->padded);
3867#endif
3868}
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003869
Linus Torvalds1da177e2005-04-16 15:20:36 -07003870/* Synchronize with packet receive processing. */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003871void synchronize_net(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003872{
3873 might_sleep();
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07003874 synchronize_rcu();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003875}
3876
3877/**
3878 * unregister_netdevice - remove device from the kernel
3879 * @dev: device
3880 *
3881 * This function shuts down a device interface and removes it
3882 * from the kernel tables. On success 0 is returned, on a failure
3883 * a negative errno code is returned.
3884 *
3885 * Callers must hold the rtnl semaphore. You may want
3886 * unregister_netdev() instead of this.
3887 */
3888
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08003889void unregister_netdevice(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003890{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003891 BUG_ON(dev_boot_phase);
3892 ASSERT_RTNL();
3893
3894 /* Some devices call without registering for initialization unwind. */
3895 if (dev->reg_state == NETREG_UNINITIALIZED) {
3896 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3897 "was registered\n", dev->name, dev);
Stephen Hemminger22f8cde2007-02-07 00:09:58 -08003898
3899 WARN_ON(1);
3900 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003901 }
3902
3903 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3904
3905 /* If device is running, close it first. */
3906 if (dev->flags & IFF_UP)
3907 dev_close(dev);
3908
3909 /* And unlink it from device chain. */
Eric W. Biedermance286d32007-09-12 13:53:49 +02003910 unlist_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003911
3912 dev->reg_state = NETREG_UNREGISTERING;
3913
3914 synchronize_net();
3915
3916 /* Shutdown queueing discipline. */
3917 dev_shutdown(dev);
3918
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003919
Linus Torvalds1da177e2005-04-16 15:20:36 -07003920 /* Notify protocols, that we are about to destroy
3921 this device. They should clean all the things.
3922 */
Alan Sternf07d5b92006-05-09 15:23:03 -07003923 raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09003924
Linus Torvalds1da177e2005-04-16 15:20:36 -07003925 /*
Patrick McHardy4417da62007-06-27 01:28:10 -07003926 * Flush the unicast and multicast chains
Linus Torvalds1da177e2005-04-16 15:20:36 -07003927 */
Denis Cheng26cc2522007-07-18 02:12:03 -07003928 dev_addr_discard(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003929
3930 if (dev->uninit)
3931 dev->uninit(dev);
3932
3933 /* Notifier chain MUST detach us from master device. */
3934 BUG_TRAP(!dev->master);
3935
Stephen Hemminger9093bbb2007-05-19 15:39:25 -07003936 /* Remove entries from sysfs */
3937 netdev_unregister_sysfs(dev);
3938
Linus Torvalds1da177e2005-04-16 15:20:36 -07003939 /* Finish processing unregister after unlock */
3940 net_set_todo(dev);
3941
3942 synchronize_net();
3943
3944 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003945}
3946
3947/**
3948 * unregister_netdev - remove device from the kernel
3949 * @dev: device
3950 *
3951 * This function shuts down a device interface and removes it
3952 * from the kernel tables. On success 0 is returned, on a failure
3953 * a negative errno code is returned.
3954 *
3955 * This is just a wrapper for unregister_netdevice that takes
3956 * the rtnl semaphore. In general you want to use this and not
3957 * unregister_netdevice.
3958 */
3959void unregister_netdev(struct net_device *dev)
3960{
3961 rtnl_lock();
3962 unregister_netdevice(dev);
3963 rtnl_unlock();
3964}
3965
3966EXPORT_SYMBOL(unregister_netdev);
3967
Eric W. Biedermance286d32007-09-12 13:53:49 +02003968/**
3969 * dev_change_net_namespace - move device to different nethost namespace
3970 * @dev: device
3971 * @net: network namespace
3972 * @pat: If not NULL name pattern to try if the current device name
3973 * is already taken in the destination network namespace.
3974 *
3975 * This function shuts down a device interface and moves it
3976 * to a new network namespace. On success 0 is returned, on
3977 * a failure a netagive errno code is returned.
3978 *
3979 * Callers must hold the rtnl semaphore.
3980 */
3981
3982int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
3983{
3984 char buf[IFNAMSIZ];
3985 const char *destname;
3986 int err;
3987
3988 ASSERT_RTNL();
3989
3990 /* Don't allow namespace local devices to be moved. */
3991 err = -EINVAL;
3992 if (dev->features & NETIF_F_NETNS_LOCAL)
3993 goto out;
3994
3995 /* Ensure the device has been registrered */
3996 err = -EINVAL;
3997 if (dev->reg_state != NETREG_REGISTERED)
3998 goto out;
3999
4000 /* Get out if there is nothing todo */
4001 err = 0;
4002 if (dev->nd_net == net)
4003 goto out;
4004
4005 /* Pick the destination device name, and ensure
4006 * we can use it in the destination network namespace.
4007 */
4008 err = -EEXIST;
4009 destname = dev->name;
4010 if (__dev_get_by_name(net, destname)) {
4011 /* We get here if we can't use the current device name */
4012 if (!pat)
4013 goto out;
4014 if (!dev_valid_name(pat))
4015 goto out;
4016 if (strchr(pat, '%')) {
4017 if (__dev_alloc_name(net, pat, buf) < 0)
4018 goto out;
4019 destname = buf;
4020 } else
4021 destname = pat;
4022 if (__dev_get_by_name(net, destname))
4023 goto out;
4024 }
4025
4026 /*
4027 * And now a mini version of register_netdevice unregister_netdevice.
4028 */
4029
4030 /* If device is running close it first. */
4031 if (dev->flags & IFF_UP)
4032 dev_close(dev);
4033
4034 /* And unlink it from device chain */
4035 err = -ENODEV;
4036 unlist_netdevice(dev);
4037
4038 synchronize_net();
4039
4040 /* Shutdown queueing discipline. */
4041 dev_shutdown(dev);
4042
4043 /* Notify protocols, that we are about to destroy
4044 this device. They should clean all the things.
4045 */
4046 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4047
4048 /*
4049 * Flush the unicast and multicast chains
4050 */
4051 dev_addr_discard(dev);
4052
4053 /* Actually switch the network namespace */
4054 dev->nd_net = net;
4055
4056 /* Assign the new device name */
4057 if (destname != dev->name)
4058 strcpy(dev->name, destname);
4059
4060 /* If there is an ifindex conflict assign a new one */
4061 if (__dev_get_by_index(net, dev->ifindex)) {
4062 int iflink = (dev->iflink == dev->ifindex);
4063 dev->ifindex = dev_new_index(net);
4064 if (iflink)
4065 dev->iflink = dev->ifindex;
4066 }
4067
4068 /* Fixup sysfs */
4069 err = device_rename(&dev->dev, dev->name);
4070 BUG_ON(err);
4071
4072 /* Add the device back in the hashes */
4073 list_netdevice(dev);
4074
4075 /* Notify protocols, that a new device appeared. */
4076 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4077
4078 synchronize_net();
4079 err = 0;
4080out:
4081 return err;
4082}
4083
Linus Torvalds1da177e2005-04-16 15:20:36 -07004084static int dev_cpu_callback(struct notifier_block *nfb,
4085 unsigned long action,
4086 void *ocpu)
4087{
4088 struct sk_buff **list_skb;
4089 struct net_device **list_net;
4090 struct sk_buff *skb;
4091 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4092 struct softnet_data *sd, *oldsd;
4093
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -07004094 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004095 return NOTIFY_OK;
4096
4097 local_irq_disable();
4098 cpu = smp_processor_id();
4099 sd = &per_cpu(softnet_data, cpu);
4100 oldsd = &per_cpu(softnet_data, oldcpu);
4101
4102 /* Find end of our completion_queue. */
4103 list_skb = &sd->completion_queue;
4104 while (*list_skb)
4105 list_skb = &(*list_skb)->next;
4106 /* Append completion queue from offline CPU. */
4107 *list_skb = oldsd->completion_queue;
4108 oldsd->completion_queue = NULL;
4109
4110 /* Find end of our output_queue. */
4111 list_net = &sd->output_queue;
4112 while (*list_net)
4113 list_net = &(*list_net)->next_sched;
4114 /* Append output queue from offline CPU. */
4115 *list_net = oldsd->output_queue;
4116 oldsd->output_queue = NULL;
4117
4118 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4119 local_irq_enable();
4120
4121 /* Process offline CPU's input_pkt_queue */
4122 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
4123 netif_rx(skb);
4124
4125 return NOTIFY_OK;
4126}
Linus Torvalds1da177e2005-04-16 15:20:36 -07004127
Chris Leechdb217332006-06-17 21:24:58 -07004128#ifdef CONFIG_NET_DMA
4129/**
Randy Dunlap0ed72ec2007-07-26 00:03:29 -07004130 * net_dma_rebalance - try to maintain one DMA channel per CPU
4131 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
4132 *
4133 * This is called when the number of channels allocated to the net_dma client
4134 * changes. The net_dma client tries to have one DMA channel per CPU.
Chris Leechdb217332006-06-17 21:24:58 -07004135 */
Dan Williamsd379b012007-07-09 11:56:42 -07004136
4137static void net_dma_rebalance(struct net_dma *net_dma)
Chris Leechdb217332006-06-17 21:24:58 -07004138{
Dan Williamsd379b012007-07-09 11:56:42 -07004139 unsigned int cpu, i, n, chan_idx;
Chris Leechdb217332006-06-17 21:24:58 -07004140 struct dma_chan *chan;
4141
Dan Williamsd379b012007-07-09 11:56:42 -07004142 if (cpus_empty(net_dma->channel_mask)) {
Chris Leechdb217332006-06-17 21:24:58 -07004143 for_each_online_cpu(cpu)
Alexey Dobriyan29bbd722006-08-02 15:02:31 -07004144 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
Chris Leechdb217332006-06-17 21:24:58 -07004145 return;
4146 }
4147
4148 i = 0;
4149 cpu = first_cpu(cpu_online_map);
4150
Dan Williamsd379b012007-07-09 11:56:42 -07004151 for_each_cpu_mask(chan_idx, net_dma->channel_mask) {
4152 chan = net_dma->channels[chan_idx];
4153
4154 n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
4155 + (i < (num_online_cpus() %
4156 cpus_weight(net_dma->channel_mask)) ? 1 : 0));
Chris Leechdb217332006-06-17 21:24:58 -07004157
4158 while(n) {
Alexey Dobriyan29bbd722006-08-02 15:02:31 -07004159 per_cpu(softnet_data, cpu).net_dma = chan;
Chris Leechdb217332006-06-17 21:24:58 -07004160 cpu = next_cpu(cpu, cpu_online_map);
4161 n--;
4162 }
4163 i++;
4164 }
Chris Leechdb217332006-06-17 21:24:58 -07004165}
4166
4167/**
4168 * netdev_dma_event - event callback for the net_dma_client
4169 * @client: should always be net_dma_client
Randy Dunlapf4b8ea72006-06-22 16:00:11 -07004170 * @chan: DMA channel for the event
Randy Dunlap0ed72ec2007-07-26 00:03:29 -07004171 * @state: DMA state to be handled
Chris Leechdb217332006-06-17 21:24:58 -07004172 */
Dan Williamsd379b012007-07-09 11:56:42 -07004173static enum dma_state_client
4174netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
4175 enum dma_state state)
Chris Leechdb217332006-06-17 21:24:58 -07004176{
Dan Williamsd379b012007-07-09 11:56:42 -07004177 int i, found = 0, pos = -1;
4178 struct net_dma *net_dma =
4179 container_of(client, struct net_dma, client);
4180 enum dma_state_client ack = DMA_DUP; /* default: take no action */
4181
4182 spin_lock(&net_dma->lock);
4183 switch (state) {
4184 case DMA_RESOURCE_AVAILABLE:
4185 for (i = 0; i < NR_CPUS; i++)
4186 if (net_dma->channels[i] == chan) {
4187 found = 1;
4188 break;
4189 } else if (net_dma->channels[i] == NULL && pos < 0)
4190 pos = i;
4191
4192 if (!found && pos >= 0) {
4193 ack = DMA_ACK;
4194 net_dma->channels[pos] = chan;
4195 cpu_set(pos, net_dma->channel_mask);
4196 net_dma_rebalance(net_dma);
4197 }
Chris Leechdb217332006-06-17 21:24:58 -07004198 break;
4199 case DMA_RESOURCE_REMOVED:
Dan Williamsd379b012007-07-09 11:56:42 -07004200 for (i = 0; i < NR_CPUS; i++)
4201 if (net_dma->channels[i] == chan) {
4202 found = 1;
4203 pos = i;
4204 break;
4205 }
4206
4207 if (found) {
4208 ack = DMA_ACK;
4209 cpu_clear(pos, net_dma->channel_mask);
4210 net_dma->channels[i] = NULL;
4211 net_dma_rebalance(net_dma);
4212 }
Chris Leechdb217332006-06-17 21:24:58 -07004213 break;
4214 default:
4215 break;
4216 }
Dan Williamsd379b012007-07-09 11:56:42 -07004217 spin_unlock(&net_dma->lock);
4218
4219 return ack;
Chris Leechdb217332006-06-17 21:24:58 -07004220}
4221
4222/**
4223 * netdev_dma_regiser - register the networking subsystem as a DMA client
4224 */
4225static int __init netdev_dma_register(void)
4226{
Dan Williamsd379b012007-07-09 11:56:42 -07004227 spin_lock_init(&net_dma.lock);
4228 dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
4229 dma_async_client_register(&net_dma.client);
4230 dma_async_client_chan_request(&net_dma.client);
Chris Leechdb217332006-06-17 21:24:58 -07004231 return 0;
4232}
4233
4234#else
4235static int __init netdev_dma_register(void) { return -ENODEV; }
4236#endif /* CONFIG_NET_DMA */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004237
Herbert Xu7f353bf2007-08-10 15:47:58 -07004238/**
4239 * netdev_compute_feature - compute conjunction of two feature sets
4240 * @all: first feature set
4241 * @one: second feature set
4242 *
4243 * Computes a new feature set after adding a device with feature set
4244 * @one to the master device with current feature set @all. Returns
4245 * the new feature set.
4246 */
4247int netdev_compute_features(unsigned long all, unsigned long one)
4248{
4249 /* if device needs checksumming, downgrade to hw checksumming */
4250 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
4251 all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
4252
4253 /* if device can't do all checksum, downgrade to ipv4/ipv6 */
4254 if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
4255 all ^= NETIF_F_HW_CSUM
4256 | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
4257
4258 if (one & NETIF_F_GSO)
4259 one |= NETIF_F_GSO_SOFTWARE;
4260 one |= NETIF_F_GSO;
4261
4262 /* If even one device supports robust GSO, enable it for all. */
4263 if (one & NETIF_F_GSO_ROBUST)
4264 all |= NETIF_F_GSO_ROBUST;
4265
4266 all &= one | NETIF_F_LLTX;
4267
4268 if (!(all & NETIF_F_ALL_CSUM))
4269 all &= ~NETIF_F_SG;
4270 if (!(all & NETIF_F_SG))
4271 all &= ~NETIF_F_GSO_MASK;
4272
4273 return all;
4274}
4275EXPORT_SYMBOL(netdev_compute_features);
4276
Eric W. Biederman881d9662007-09-17 11:56:21 -07004277/* Initialize per network namespace state */
4278static int netdev_init(struct net *net)
4279{
4280 int i;
4281 INIT_LIST_HEAD(&net->dev_base_head);
4282 rwlock_init(&dev_base_lock);
4283
4284 net->dev_name_head = kmalloc(
4285 sizeof(*net->dev_name_head)*NETDEV_HASHENTRIES, GFP_KERNEL);
4286 if (!net->dev_name_head)
4287 return -ENOMEM;
4288
4289 net->dev_index_head = kmalloc(
4290 sizeof(*net->dev_index_head)*NETDEV_HASHENTRIES, GFP_KERNEL);
4291 if (!net->dev_index_head) {
4292 kfree(net->dev_name_head);
4293 return -ENOMEM;
4294 }
4295
4296 for (i = 0; i < NETDEV_HASHENTRIES; i++)
4297 INIT_HLIST_HEAD(&net->dev_name_head[i]);
4298
4299 for (i = 0; i < NETDEV_HASHENTRIES; i++)
4300 INIT_HLIST_HEAD(&net->dev_index_head[i]);
4301
4302 return 0;
4303}
4304
4305static void netdev_exit(struct net *net)
4306{
4307 kfree(net->dev_name_head);
4308 kfree(net->dev_index_head);
4309}
4310
4311static struct pernet_operations netdev_net_ops = {
4312 .init = netdev_init,
4313 .exit = netdev_exit,
4314};
4315
Eric W. Biedermance286d32007-09-12 13:53:49 +02004316static void default_device_exit(struct net *net)
4317{
4318 struct net_device *dev, *next;
4319 /*
4320 * Push all migratable of the network devices back to the
4321 * initial network namespace
4322 */
4323 rtnl_lock();
4324 for_each_netdev_safe(net, dev, next) {
4325 int err;
4326
4327 /* Ignore unmoveable devices (i.e. loopback) */
4328 if (dev->features & NETIF_F_NETNS_LOCAL)
4329 continue;
4330
4331 /* Push remaing network devices to init_net */
4332 err = dev_change_net_namespace(dev, &init_net, "dev%d");
4333 if (err) {
4334 printk(KERN_WARNING "%s: failed to move %s to init_net: %d\n",
4335 __func__, dev->name, err);
4336 unregister_netdevice(dev);
4337 }
4338 }
4339 rtnl_unlock();
4340}
4341
4342static struct pernet_operations default_device_ops = {
4343 .exit = default_device_exit,
4344};
4345
Linus Torvalds1da177e2005-04-16 15:20:36 -07004346/*
4347 * Initialize the DEV module. At boot time this walks the device list and
4348 * unhooks any devices that fail to initialise (normally hardware not
4349 * present) and leaves us with a valid list of present and active devices.
4350 *
4351 */
4352
4353/*
4354 * This is called single threaded during boot, so no need
4355 * to take the rtnl semaphore.
4356 */
4357static int __init net_dev_init(void)
4358{
4359 int i, rc = -ENOMEM;
4360
4361 BUG_ON(!dev_boot_phase);
4362
Linus Torvalds1da177e2005-04-16 15:20:36 -07004363 if (dev_proc_init())
4364 goto out;
4365
4366 if (netdev_sysfs_init())
4367 goto out;
4368
4369 INIT_LIST_HEAD(&ptype_all);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09004370 for (i = 0; i < 16; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004371 INIT_LIST_HEAD(&ptype_base[i]);
4372
Eric W. Biederman881d9662007-09-17 11:56:21 -07004373 if (register_pernet_subsys(&netdev_net_ops))
4374 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004375
Eric W. Biedermance286d32007-09-12 13:53:49 +02004376 if (register_pernet_device(&default_device_ops))
4377 goto out;
4378
Linus Torvalds1da177e2005-04-16 15:20:36 -07004379 /*
4380 * Initialise the packet receive queues.
4381 */
4382
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07004383 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004384 struct softnet_data *queue;
4385
4386 queue = &per_cpu(softnet_data, i);
4387 skb_queue_head_init(&queue->input_pkt_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004388 queue->completion_queue = NULL;
4389 INIT_LIST_HEAD(&queue->poll_list);
Stephen Hemmingerbea33482007-10-03 16:41:36 -07004390
4391 queue->backlog.poll = process_backlog;
4392 queue->backlog.weight = weight_p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004393 }
4394
Chris Leechdb217332006-06-17 21:24:58 -07004395 netdev_dma_register();
4396
Linus Torvalds1da177e2005-04-16 15:20:36 -07004397 dev_boot_phase = 0;
4398
4399 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
4400 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
4401
4402 hotcpu_notifier(dev_cpu_callback, 0);
4403 dst_init();
4404 dev_mcast_init();
4405 rc = 0;
4406out:
4407 return rc;
4408}
4409
4410subsys_initcall(net_dev_init);
4411
4412EXPORT_SYMBOL(__dev_get_by_index);
4413EXPORT_SYMBOL(__dev_get_by_name);
4414EXPORT_SYMBOL(__dev_remove_pack);
Mitch Williamsc2373ee2005-11-09 10:34:45 -08004415EXPORT_SYMBOL(dev_valid_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004416EXPORT_SYMBOL(dev_add_pack);
4417EXPORT_SYMBOL(dev_alloc_name);
4418EXPORT_SYMBOL(dev_close);
4419EXPORT_SYMBOL(dev_get_by_flags);
4420EXPORT_SYMBOL(dev_get_by_index);
4421EXPORT_SYMBOL(dev_get_by_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004422EXPORT_SYMBOL(dev_open);
4423EXPORT_SYMBOL(dev_queue_xmit);
4424EXPORT_SYMBOL(dev_remove_pack);
4425EXPORT_SYMBOL(dev_set_allmulti);
4426EXPORT_SYMBOL(dev_set_promiscuity);
4427EXPORT_SYMBOL(dev_change_flags);
4428EXPORT_SYMBOL(dev_set_mtu);
4429EXPORT_SYMBOL(dev_set_mac_address);
4430EXPORT_SYMBOL(free_netdev);
4431EXPORT_SYMBOL(netdev_boot_setup_check);
4432EXPORT_SYMBOL(netdev_set_master);
4433EXPORT_SYMBOL(netdev_state_change);
4434EXPORT_SYMBOL(netif_receive_skb);
4435EXPORT_SYMBOL(netif_rx);
4436EXPORT_SYMBOL(register_gifconf);
4437EXPORT_SYMBOL(register_netdevice);
4438EXPORT_SYMBOL(register_netdevice_notifier);
4439EXPORT_SYMBOL(skb_checksum_help);
4440EXPORT_SYMBOL(synchronize_net);
4441EXPORT_SYMBOL(unregister_netdevice);
4442EXPORT_SYMBOL(unregister_netdevice_notifier);
4443EXPORT_SYMBOL(net_enable_timestamp);
4444EXPORT_SYMBOL(net_disable_timestamp);
4445EXPORT_SYMBOL(dev_get_flags);
4446
4447#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
4448EXPORT_SYMBOL(br_handle_frame_hook);
4449EXPORT_SYMBOL(br_fdb_get_hook);
4450EXPORT_SYMBOL(br_fdb_put_hook);
4451#endif
4452
4453#ifdef CONFIG_KMOD
4454EXPORT_SYMBOL(dev_load);
4455#endif
4456
4457EXPORT_PER_CPU_SYMBOL(softnet_data);