netdev: Move _xmit_lock and xmit_lock_owner into netdev_queue.
[linux-2.6.git] / net / 8021q / vlan_dev.c
1 /* -*- linux-c -*-
2  * INET         802.1Q VLAN
3  *              Ethernet-type device handling.
4  *
5  * Authors:     Ben Greear <greearb@candelatech.com>
6  *              Please send support related email to: netdev@vger.kernel.org
7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
8  *
9  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
10  *                - reset skb->pkt_type on incoming packets when MAC was changed
11  *                - see that changed MAC is saddr for outgoing packets
12  *              Oct 20, 2001:  Ard van Breeman:
13  *                - Fix MC-list, finally.
14  *                - Flush MC-list on VLAN destroy.
15  *
16  *
17  *              This program is free software; you can redistribute it and/or
18  *              modify it under the terms of the GNU General Public License
19  *              as published by the Free Software Foundation; either version
20  *              2 of the License, or (at your option) any later version.
21  */
22
23 #include <linux/module.h>
24 #include <linux/mm.h>
25 #include <linux/in.h>
26 #include <linux/init.h>
27 #include <asm/uaccess.h> /* for copy_from_user */
28 #include <linux/skbuff.h>
29 #include <linux/netdevice.h>
30 #include <linux/etherdevice.h>
31 #include <linux/ethtool.h>
32 #include <net/datalink.h>
33 #include <net/p8022.h>
34 #include <net/arp.h>
35
36 #include "vlan.h"
37 #include "vlanproc.h"
38 #include <linux/if_vlan.h>
39 #include <net/ip.h>
40
41 /*
42  *      Rebuild the Ethernet MAC header. This is called after an ARP
43  *      (or in future other address resolution) has completed on this
44  *      sk_buff. We now let ARP fill in the other fields.
45  *
46  *      This routine CANNOT use cached dst->neigh!
47  *      Really, it is used only when dst->neigh is wrong.
48  *
49  * TODO:  This needs a checkup, I'm ignorant here. --BLG
50  */
51 static int vlan_dev_rebuild_header(struct sk_buff *skb)
52 {
53         struct net_device *dev = skb->dev;
54         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
55
56         switch (veth->h_vlan_encapsulated_proto) {
57 #ifdef CONFIG_INET
58         case __constant_htons(ETH_P_IP):
59
60                 /* TODO:  Confirm this will work with VLAN headers... */
61                 return arp_find(veth->h_dest, skb);
62 #endif
63         default:
64                 pr_debug("%s: unable to resolve type %X addresses.\n",
65                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
66
67                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
68                 break;
69         }
70
71         return 0;
72 }
73
74 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
75 {
76         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
77                 if (skb_cow(skb, skb_headroom(skb)) < 0)
78                         skb = NULL;
79                 if (skb) {
80                         /* Lifted from Gleb's VLAN code... */
81                         memmove(skb->data - ETH_HLEN,
82                                 skb->data - VLAN_ETH_HLEN, 12);
83                         skb->mac_header += VLAN_HLEN;
84                 }
85         }
86
87         return skb;
88 }
89
90 static inline void vlan_set_encap_proto(struct sk_buff *skb,
91                 struct vlan_hdr *vhdr)
92 {
93         __be16 proto;
94         unsigned char *rawp;
95
96         /*
97          * Was a VLAN packet, grab the encapsulated protocol, which the layer
98          * three protocols care about.
99          */
100
101         proto = vhdr->h_vlan_encapsulated_proto;
102         if (ntohs(proto) >= 1536) {
103                 skb->protocol = proto;
104                 return;
105         }
106
107         rawp = skb->data;
108         if (*(unsigned short *)rawp == 0xFFFF)
109                 /*
110                  * This is a magic hack to spot IPX packets. Older Novell
111                  * breaks the protocol design and runs IPX over 802.3 without
112                  * an 802.2 LLC layer. We look for FFFF which isn't a used
113                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
114                  * but does for the rest.
115                  */
116                 skb->protocol = htons(ETH_P_802_3);
117         else
118                 /*
119                  * Real 802.2 LLC
120                  */
121                 skb->protocol = htons(ETH_P_802_2);
122 }
123
124 /*
125  *      Determine the packet's protocol ID. The rule here is that we
126  *      assume 802.3 if the type field is short enough to be a length.
127  *      This is normal practice and works for any 'now in use' protocol.
128  *
129  *  Also, at this point we assume that we ARE dealing exclusively with
130  *  VLAN packets, or packets that should be made into VLAN packets based
131  *  on a default VLAN ID.
132  *
133  *  NOTE:  Should be similar to ethernet/eth.c.
134  *
135  *  SANITY NOTE:  This method is called when a packet is moving up the stack
136  *                towards userland.  To get here, it would have already passed
137  *                through the ethernet/eth.c eth_type_trans() method.
138  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
139  *                 stored UNALIGNED in the memory.  RISC systems don't like
140  *                 such cases very much...
141  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
142  *                  aligned, so there doesn't need to be any of the unaligned
143  *                  stuff.  It has been commented out now...  --Ben
144  *
145  */
146 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
147                   struct packet_type *ptype, struct net_device *orig_dev)
148 {
149         struct vlan_hdr *vhdr;
150         struct net_device_stats *stats;
151         u16 vlan_id;
152         u16 vlan_tci;
153
154         skb = skb_share_check(skb, GFP_ATOMIC);
155         if (skb == NULL)
156                 goto err_free;
157
158         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
159                 goto err_free;
160
161         vhdr = (struct vlan_hdr *)skb->data;
162         vlan_tci = ntohs(vhdr->h_vlan_TCI);
163         vlan_id = vlan_tci & VLAN_VID_MASK;
164
165         rcu_read_lock();
166         skb->dev = __find_vlan_dev(dev, vlan_id);
167         if (!skb->dev) {
168                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
169                          __func__, vlan_id, dev->name);
170                 goto err_unlock;
171         }
172
173         skb->dev->last_rx = jiffies;
174
175         stats = &skb->dev->stats;
176         stats->rx_packets++;
177         stats->rx_bytes += skb->len;
178
179         skb_pull_rcsum(skb, VLAN_HLEN);
180
181         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
182
183         pr_debug("%s: priority: %u for TCI: %hu\n",
184                  __func__, skb->priority, vlan_tci);
185
186         switch (skb->pkt_type) {
187         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
188                 /* stats->broadcast ++; // no such counter :-( */
189                 break;
190
191         case PACKET_MULTICAST:
192                 stats->multicast++;
193                 break;
194
195         case PACKET_OTHERHOST:
196                 /* Our lower layer thinks this is not local, let's make sure.
197                  * This allows the VLAN to have a different MAC than the
198                  * underlying device, and still route correctly.
199                  */
200                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
201                                         skb->dev->dev_addr))
202                         skb->pkt_type = PACKET_HOST;
203                 break;
204         default:
205                 break;
206         }
207
208         vlan_set_encap_proto(skb, vhdr);
209
210         skb = vlan_check_reorder_header(skb);
211         if (!skb) {
212                 stats->rx_errors++;
213                 goto err_unlock;
214         }
215
216         netif_rx(skb);
217         rcu_read_unlock();
218         return NET_RX_SUCCESS;
219
220 err_unlock:
221         rcu_read_unlock();
222 err_free:
223         kfree_skb(skb);
224         return NET_RX_DROP;
225 }
226
227 static inline u16
228 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
229 {
230         struct vlan_priority_tci_mapping *mp;
231
232         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
233         while (mp) {
234                 if (mp->priority == skb->priority) {
235                         return mp->vlan_qos; /* This should already be shifted
236                                               * to mask correctly with the
237                                               * VLAN's TCI */
238                 }
239                 mp = mp->next;
240         }
241         return 0;
242 }
243
244 /*
245  *      Create the VLAN header for an arbitrary protocol layer
246  *
247  *      saddr=NULL      means use device source address
248  *      daddr=NULL      means leave destination address (eg unresolved arp)
249  *
250  *  This is called when the SKB is moving down the stack towards the
251  *  physical devices.
252  */
253 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
254                                 unsigned short type,
255                                 const void *daddr, const void *saddr,
256                                 unsigned int len)
257 {
258         struct vlan_hdr *vhdr;
259         u16 vlan_tci = 0;
260         int rc = 0;
261         int build_vlan_header = 0;
262
263         pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n",
264                  __func__, skb, type, len, vlan_dev_info(dev)->vlan_id,
265                  daddr);
266
267         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
268                 return -ENOSPC;
269
270         /* build vlan header only if re_order_header flag is NOT set.  This
271          * fixes some programs that get confused when they see a VLAN device
272          * sending a frame that is VLAN encoded (the consensus is that the VLAN
273          * device should look completely like an Ethernet device when the
274          * REORDER_HEADER flag is set)  The drawback to this is some extra
275          * header shuffling in the hard_start_xmit.  Users can turn off this
276          * REORDER behaviour with the vconfig tool.
277          */
278         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR))
279                 build_vlan_header = 1;
280
281         if (build_vlan_header) {
282                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
283
284                 /* build the four bytes that make this a VLAN header. */
285
286                 /* Now, construct the second two bytes. This field looks
287                  * something like:
288                  * usr_priority: 3 bits  (high bits)
289                  * CFI           1 bit
290                  * VLAN ID       12 bits (low bits)
291                  *
292                  */
293                 vlan_tci = vlan_dev_info(dev)->vlan_id;
294                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
295
296                 vhdr->h_vlan_TCI = htons(vlan_tci);
297
298                 /*
299                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
300                  *  put the length in here instead. It is up to the 802.2
301                  *  layer to carry protocol information.
302                  */
303
304                 if (type != ETH_P_802_3)
305                         vhdr->h_vlan_encapsulated_proto = htons(type);
306                 else
307                         vhdr->h_vlan_encapsulated_proto = htons(len);
308
309                 skb->protocol = htons(ETH_P_8021Q);
310         }
311
312         /* Before delegating work to the lower layer, enter our MAC-address */
313         if (saddr == NULL)
314                 saddr = dev->dev_addr;
315
316         dev = vlan_dev_info(dev)->real_dev;
317
318         if (build_vlan_header) {
319                 /* Now make the underlying real hard header */
320                 rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr,
321                                      len + VLAN_HLEN);
322                 if (rc > 0)
323                         rc += VLAN_HLEN;
324                 else if (rc < 0)
325                         rc -= VLAN_HLEN;
326         } else
327                 /* If here, then we'll just make a normal looking ethernet
328                  * frame, but, the hard_start_xmit method will insert the tag
329                  * (it has to be able to do this for bridged and other skbs
330                  * that don't come down the protocol stack in an orderly manner.
331                  */
332                 rc = dev_hard_header(skb, dev, type, daddr, saddr, len);
333
334         return rc;
335 }
336
337 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
338 {
339         struct net_device_stats *stats = &dev->stats;
340         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
341
342         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
343          *
344          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
345          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
346          */
347
348         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
349                 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
350                 int orig_headroom = skb_headroom(skb);
351                 u16 vlan_tci;
352
353                 /* This is not a VLAN frame...but we can fix that! */
354                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
355
356                 pr_debug("%s: proto to encap: 0x%hx\n",
357                          __func__, ntohs(veth->h_vlan_proto));
358                 /* Construct the second two bytes. This field looks something
359                  * like:
360                  * usr_priority: 3 bits  (high bits)
361                  * CFI           1 bit
362                  * VLAN ID       12 bits (low bits)
363                  */
364                 vlan_tci = vlan_dev_info(dev)->vlan_id;
365                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
366
367                 skb = __vlan_put_tag(skb, vlan_tci);
368                 if (!skb) {
369                         stats->tx_dropped++;
370                         return 0;
371                 }
372
373                 if (orig_headroom < VLAN_HLEN)
374                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
375         }
376
377         pr_debug("%s: about to send skb: %p to dev: %s\n",
378                 __func__, skb, skb->dev->name);
379         pr_debug("  " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n",
380                  veth->h_dest[0], veth->h_dest[1], veth->h_dest[2],
381                  veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
382                  veth->h_source[0], veth->h_source[1], veth->h_source[2],
383                  veth->h_source[3], veth->h_source[4], veth->h_source[5],
384                  veth->h_vlan_proto, veth->h_vlan_TCI,
385                  veth->h_vlan_encapsulated_proto);
386
387         stats->tx_packets++; /* for statics only */
388         stats->tx_bytes += skb->len;
389
390         skb->dev = vlan_dev_info(dev)->real_dev;
391         dev_queue_xmit(skb);
392
393         return 0;
394 }
395
396 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
397                                             struct net_device *dev)
398 {
399         struct net_device_stats *stats = &dev->stats;
400         u16 vlan_tci;
401
402         /* Construct the second two bytes. This field looks something
403          * like:
404          * usr_priority: 3 bits  (high bits)
405          * CFI           1 bit
406          * VLAN ID       12 bits (low bits)
407          */
408         vlan_tci = vlan_dev_info(dev)->vlan_id;
409         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
410         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
411
412         stats->tx_packets++;
413         stats->tx_bytes += skb->len;
414
415         skb->dev = vlan_dev_info(dev)->real_dev;
416         dev_queue_xmit(skb);
417
418         return 0;
419 }
420
421 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
422 {
423         /* TODO: gotta make sure the underlying layer can handle it,
424          * maybe an IFF_VLAN_CAPABLE flag for devices?
425          */
426         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
427                 return -ERANGE;
428
429         dev->mtu = new_mtu;
430
431         return 0;
432 }
433
434 void vlan_dev_set_ingress_priority(const struct net_device *dev,
435                                    u32 skb_prio, u16 vlan_prio)
436 {
437         struct vlan_dev_info *vlan = vlan_dev_info(dev);
438
439         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
440                 vlan->nr_ingress_mappings--;
441         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
442                 vlan->nr_ingress_mappings++;
443
444         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
445 }
446
447 int vlan_dev_set_egress_priority(const struct net_device *dev,
448                                  u32 skb_prio, u16 vlan_prio)
449 {
450         struct vlan_dev_info *vlan = vlan_dev_info(dev);
451         struct vlan_priority_tci_mapping *mp = NULL;
452         struct vlan_priority_tci_mapping *np;
453         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
454
455         /* See if a priority mapping exists.. */
456         mp = vlan->egress_priority_map[skb_prio & 0xF];
457         while (mp) {
458                 if (mp->priority == skb_prio) {
459                         if (mp->vlan_qos && !vlan_qos)
460                                 vlan->nr_egress_mappings--;
461                         else if (!mp->vlan_qos && vlan_qos)
462                                 vlan->nr_egress_mappings++;
463                         mp->vlan_qos = vlan_qos;
464                         return 0;
465                 }
466                 mp = mp->next;
467         }
468
469         /* Create a new mapping then. */
470         mp = vlan->egress_priority_map[skb_prio & 0xF];
471         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
472         if (!np)
473                 return -ENOBUFS;
474
475         np->next = mp;
476         np->priority = skb_prio;
477         np->vlan_qos = vlan_qos;
478         vlan->egress_priority_map[skb_prio & 0xF] = np;
479         if (vlan_qos)
480                 vlan->nr_egress_mappings++;
481         return 0;
482 }
483
484 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
485 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
486 {
487         struct vlan_dev_info *vlan = vlan_dev_info(dev);
488         u32 old_flags = vlan->flags;
489
490         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
491                 return -EINVAL;
492
493         vlan->flags = (old_flags & ~mask) | (flags & mask);
494
495         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
496                 if (vlan->flags & VLAN_FLAG_GVRP)
497                         vlan_gvrp_request_join(dev);
498                 else
499                         vlan_gvrp_request_leave(dev);
500         }
501         return 0;
502 }
503
504 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
505 {
506         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
507 }
508
509 static int vlan_dev_open(struct net_device *dev)
510 {
511         struct vlan_dev_info *vlan = vlan_dev_info(dev);
512         struct net_device *real_dev = vlan->real_dev;
513         int err;
514
515         if (!(real_dev->flags & IFF_UP))
516                 return -ENETDOWN;
517
518         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
519                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
520                 if (err < 0)
521                         return err;
522         }
523         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
524
525         if (dev->flags & IFF_ALLMULTI)
526                 dev_set_allmulti(real_dev, 1);
527         if (dev->flags & IFF_PROMISC)
528                 dev_set_promiscuity(real_dev, 1);
529
530         if (vlan->flags & VLAN_FLAG_GVRP)
531                 vlan_gvrp_request_join(dev);
532
533         return 0;
534 }
535
536 static int vlan_dev_stop(struct net_device *dev)
537 {
538         struct vlan_dev_info *vlan = vlan_dev_info(dev);
539         struct net_device *real_dev = vlan->real_dev;
540
541         if (vlan->flags & VLAN_FLAG_GVRP)
542                 vlan_gvrp_request_leave(dev);
543
544         dev_mc_unsync(real_dev, dev);
545         dev_unicast_unsync(real_dev, dev);
546         if (dev->flags & IFF_ALLMULTI)
547                 dev_set_allmulti(real_dev, -1);
548         if (dev->flags & IFF_PROMISC)
549                 dev_set_promiscuity(real_dev, -1);
550
551         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
552                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
553
554         return 0;
555 }
556
557 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
558 {
559         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
560         struct sockaddr *addr = p;
561         int err;
562
563         if (!is_valid_ether_addr(addr->sa_data))
564                 return -EADDRNOTAVAIL;
565
566         if (!(dev->flags & IFF_UP))
567                 goto out;
568
569         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
570                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
571                 if (err < 0)
572                         return err;
573         }
574
575         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
576                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
577
578 out:
579         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
580         return 0;
581 }
582
583 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
584 {
585         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
586         struct ifreq ifrr;
587         int err = -EOPNOTSUPP;
588
589         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
590         ifrr.ifr_ifru = ifr->ifr_ifru;
591
592         switch (cmd) {
593         case SIOCGMIIPHY:
594         case SIOCGMIIREG:
595         case SIOCSMIIREG:
596                 if (real_dev->do_ioctl && netif_device_present(real_dev))
597                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
598                 break;
599         }
600
601         if (!err)
602                 ifr->ifr_ifru = ifrr.ifr_ifru;
603
604         return err;
605 }
606
607 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
608 {
609         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
610
611         if (change & IFF_ALLMULTI)
612                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
613         if (change & IFF_PROMISC)
614                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
615 }
616
617 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
618 {
619         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
620         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
621 }
622
623 /*
624  * vlan network devices have devices nesting below it, and are a special
625  * "super class" of normal network devices; split their locks off into a
626  * separate class since they always nest.
627  */
628 static struct lock_class_key vlan_netdev_xmit_lock_key;
629
630 static void vlan_dev_set_lockdep_one(struct netdev_queue *txq,
631                                      int subclass)
632 {
633         lockdep_set_class_and_subclass(&txq->_xmit_lock,
634                                        &vlan_netdev_xmit_lock_key, subclass);
635 }
636
637 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
638 {
639         vlan_dev_set_lockdep_one(&dev->tx_queue, subclass);
640 }
641
642 static const struct header_ops vlan_header_ops = {
643         .create  = vlan_dev_hard_header,
644         .rebuild = vlan_dev_rebuild_header,
645         .parse   = eth_header_parse,
646 };
647
648 static int vlan_dev_init(struct net_device *dev)
649 {
650         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
651         int subclass = 0;
652
653         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
654         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
655         dev->iflink = real_dev->ifindex;
656         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
657                                           (1<<__LINK_STATE_DORMANT))) |
658                       (1<<__LINK_STATE_PRESENT);
659
660         dev->features |= real_dev->features & real_dev->vlan_features;
661
662         /* ipv6 shared card related stuff */
663         dev->dev_id = real_dev->dev_id;
664
665         if (is_zero_ether_addr(dev->dev_addr))
666                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
667         if (is_zero_ether_addr(dev->broadcast))
668                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
669
670         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
671                 dev->header_ops      = real_dev->header_ops;
672                 dev->hard_header_len = real_dev->hard_header_len;
673                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
674         } else {
675                 dev->header_ops      = &vlan_header_ops;
676                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
677                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
678         }
679
680         if (is_vlan_dev(real_dev))
681                 subclass = 1;
682
683         vlan_dev_set_lockdep_class(dev, subclass);
684         return 0;
685 }
686
687 static void vlan_dev_uninit(struct net_device *dev)
688 {
689         struct vlan_priority_tci_mapping *pm;
690         struct vlan_dev_info *vlan = vlan_dev_info(dev);
691         int i;
692
693         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
694                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
695                         vlan->egress_priority_map[i] = pm->next;
696                         kfree(pm);
697                 }
698         }
699 }
700
701 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
702 {
703         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
704         struct net_device *real_dev = vlan->real_dev;
705
706         if (real_dev->ethtool_ops == NULL ||
707             real_dev->ethtool_ops->get_rx_csum == NULL)
708                 return 0;
709         return real_dev->ethtool_ops->get_rx_csum(real_dev);
710 }
711
712 static const struct ethtool_ops vlan_ethtool_ops = {
713         .get_link               = ethtool_op_get_link,
714         .get_rx_csum            = vlan_ethtool_get_rx_csum,
715 };
716
717 void vlan_setup(struct net_device *dev)
718 {
719         ether_setup(dev);
720
721         dev->priv_flags         |= IFF_802_1Q_VLAN;
722         dev->tx_queue_len       = 0;
723
724         dev->change_mtu         = vlan_dev_change_mtu;
725         dev->init               = vlan_dev_init;
726         dev->uninit             = vlan_dev_uninit;
727         dev->open               = vlan_dev_open;
728         dev->stop               = vlan_dev_stop;
729         dev->set_mac_address    = vlan_dev_set_mac_address;
730         dev->set_rx_mode        = vlan_dev_set_rx_mode;
731         dev->set_multicast_list = vlan_dev_set_rx_mode;
732         dev->change_rx_flags    = vlan_dev_change_rx_flags;
733         dev->do_ioctl           = vlan_dev_ioctl;
734         dev->destructor         = free_netdev;
735         dev->ethtool_ops        = &vlan_ethtool_ops;
736
737         memset(dev->broadcast, 0, ETH_ALEN);
738 }