fc60c6d096b938af8330a402f542d590ee40fd6a
[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 <net/datalink.h>
32 #include <net/p8022.h>
33 #include <net/arp.h>
34
35 #include "vlan.h"
36 #include "vlanproc.h"
37 #include <linux/if_vlan.h>
38 #include <net/ip.h>
39
40 /*
41  *      Rebuild the Ethernet MAC header. This is called after an ARP
42  *      (or in future other address resolution) has completed on this
43  *      sk_buff. We now let ARP fill in the other fields.
44  *
45  *      This routine CANNOT use cached dst->neigh!
46  *      Really, it is used only when dst->neigh is wrong.
47  *
48  * TODO:  This needs a checkup, I'm ignorant here. --BLG
49  */
50 static int vlan_dev_rebuild_header(struct sk_buff *skb)
51 {
52         struct net_device *dev = skb->dev;
53         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
54
55         switch (veth->h_vlan_encapsulated_proto) {
56 #ifdef CONFIG_INET
57         case __constant_htons(ETH_P_IP):
58
59                 /* TODO:  Confirm this will work with VLAN headers... */
60                 return arp_find(veth->h_dest, skb);
61 #endif
62         default:
63                 pr_debug("%s: unable to resolve type %X addresses.\n",
64                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
65
66                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
67                 break;
68         }
69
70         return 0;
71 }
72
73 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
74 {
75         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
76                 if (skb_shared(skb) || skb_cloned(skb)) {
77                         struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
78                         kfree_skb(skb);
79                         skb = nskb;
80                 }
81                 if (skb) {
82                         /* Lifted from Gleb's VLAN code... */
83                         memmove(skb->data - ETH_HLEN,
84                                 skb->data - VLAN_ETH_HLEN, 12);
85                         skb->mac_header += VLAN_HLEN;
86                 }
87         }
88
89         return skb;
90 }
91
92 static inline void vlan_set_encap_proto(struct sk_buff *skb,
93                 struct vlan_hdr *vhdr)
94 {
95         __be16 proto;
96         unsigned char *rawp;
97
98         /*
99          * Was a VLAN packet, grab the encapsulated protocol, which the layer
100          * three protocols care about.
101          */
102
103         proto = vhdr->h_vlan_encapsulated_proto;
104         if (ntohs(proto) >= 1536) {
105                 skb->protocol = proto;
106                 return;
107         }
108
109         rawp = skb->data;
110         if (*(unsigned short *)rawp == 0xFFFF)
111                 /*
112                  * This is a magic hack to spot IPX packets. Older Novell
113                  * breaks the protocol design and runs IPX over 802.3 without
114                  * an 802.2 LLC layer. We look for FFFF which isn't a used
115                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
116                  * but does for the rest.
117                  */
118                 skb->protocol = htons(ETH_P_802_3);
119         else
120                 /*
121                  * Real 802.2 LLC
122                  */
123                 skb->protocol = htons(ETH_P_802_2);
124 }
125
126 /*
127  *      Determine the packet's protocol ID. The rule here is that we
128  *      assume 802.3 if the type field is short enough to be a length.
129  *      This is normal practice and works for any 'now in use' protocol.
130  *
131  *  Also, at this point we assume that we ARE dealing exclusively with
132  *  VLAN packets, or packets that should be made into VLAN packets based
133  *  on a default VLAN ID.
134  *
135  *  NOTE:  Should be similar to ethernet/eth.c.
136  *
137  *  SANITY NOTE:  This method is called when a packet is moving up the stack
138  *                towards userland.  To get here, it would have already passed
139  *                through the ethernet/eth.c eth_type_trans() method.
140  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
141  *                 stored UNALIGNED in the memory.  RISC systems don't like
142  *                 such cases very much...
143  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
144  *                  aligned, so there doesn't need to be any of the unaligned
145  *                  stuff.  It has been commented out now...  --Ben
146  *
147  */
148 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
149                   struct packet_type *ptype, struct net_device *orig_dev)
150 {
151         struct vlan_hdr *vhdr;
152         unsigned short vid;
153         struct net_device_stats *stats;
154         unsigned short vlan_TCI;
155
156         if (dev->nd_net != &init_net)
157                 goto err_free;
158
159         skb = skb_share_check(skb, GFP_ATOMIC);
160         if (skb == NULL)
161                 goto err_free;
162
163         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
164                 goto err_free;
165
166         vhdr = (struct vlan_hdr *)skb->data;
167         vlan_TCI = ntohs(vhdr->h_vlan_TCI);
168         vid = (vlan_TCI & VLAN_VID_MASK);
169
170         rcu_read_lock();
171         skb->dev = __find_vlan_dev(dev, vid);
172         if (!skb->dev) {
173                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
174                          __FUNCTION__, (unsigned int)vid, dev->name);
175                 goto err_unlock;
176         }
177
178         skb->dev->last_rx = jiffies;
179
180         stats = &skb->dev->stats;
181         stats->rx_packets++;
182         stats->rx_bytes += skb->len;
183
184         skb_pull_rcsum(skb, VLAN_HLEN);
185
186         skb->priority = vlan_get_ingress_priority(skb->dev,
187                                                   ntohs(vhdr->h_vlan_TCI));
188
189         pr_debug("%s: priority: %u for TCI: %hu\n",
190                  __FUNCTION__, skb->priority, ntohs(vhdr->h_vlan_TCI));
191
192         switch (skb->pkt_type) {
193         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
194                 /* stats->broadcast ++; // no such counter :-( */
195                 break;
196
197         case PACKET_MULTICAST:
198                 stats->multicast++;
199                 break;
200
201         case PACKET_OTHERHOST:
202                 /* Our lower layer thinks this is not local, let's make sure.
203                  * This allows the VLAN to have a different MAC than the
204                  * underlying device, and still route correctly.
205                  */
206                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
207                                         skb->dev->dev_addr))
208                         skb->pkt_type = PACKET_HOST;
209                 break;
210         default:
211                 break;
212         }
213
214         vlan_set_encap_proto(skb, vhdr);
215
216         skb = vlan_check_reorder_header(skb);
217         if (!skb) {
218                 stats->rx_errors++;
219                 goto err_unlock;
220         }
221
222         netif_rx(skb);
223         rcu_read_unlock();
224         return NET_RX_SUCCESS;
225
226 err_unlock:
227         rcu_read_unlock();
228 err_free:
229         kfree_skb(skb);
230         return NET_RX_DROP;
231 }
232
233 static inline unsigned short
234 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
235 {
236         struct vlan_priority_tci_mapping *mp;
237
238         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
239         while (mp) {
240                 if (mp->priority == skb->priority) {
241                         return mp->vlan_qos; /* This should already be shifted
242                                               * to mask correctly with the
243                                               * VLAN's TCI */
244                 }
245                 mp = mp->next;
246         }
247         return 0;
248 }
249
250 /*
251  *      Create the VLAN header for an arbitrary protocol layer
252  *
253  *      saddr=NULL      means use device source address
254  *      daddr=NULL      means leave destination address (eg unresolved arp)
255  *
256  *  This is called when the SKB is moving down the stack towards the
257  *  physical devices.
258  */
259 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
260                                 unsigned short type,
261                                 const void *daddr, const void *saddr,
262                                 unsigned int len)
263 {
264         struct vlan_hdr *vhdr;
265         unsigned short veth_TCI = 0;
266         int rc = 0;
267         int build_vlan_header = 0;
268         struct net_device *vdev = dev;
269
270         pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n",
271                  __FUNCTION__, skb, type, len, vlan_dev_info(dev)->vlan_id,
272                  daddr);
273
274         /* build vlan header only if re_order_header flag is NOT set.  This
275          * fixes some programs that get confused when they see a VLAN device
276          * sending a frame that is VLAN encoded (the consensus is that the VLAN
277          * device should look completely like an Ethernet device when the
278          * REORDER_HEADER flag is set)  The drawback to this is some extra
279          * header shuffling in the hard_start_xmit.  Users can turn off this
280          * REORDER behaviour with the vconfig tool.
281          */
282         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR))
283                 build_vlan_header = 1;
284
285         if (build_vlan_header) {
286                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
287
288                 /* build the four bytes that make this a VLAN header. */
289
290                 /* Now, construct the second two bytes. This field looks
291                  * something like:
292                  * usr_priority: 3 bits  (high bits)
293                  * CFI           1 bit
294                  * VLAN ID       12 bits (low bits)
295                  *
296                  */
297                 veth_TCI = vlan_dev_info(dev)->vlan_id;
298                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
299
300                 vhdr->h_vlan_TCI = htons(veth_TCI);
301
302                 /*
303                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
304                  *  put the length in here instead. It is up to the 802.2
305                  *  layer to carry protocol information.
306                  */
307
308                 if (type != ETH_P_802_3)
309                         vhdr->h_vlan_encapsulated_proto = htons(type);
310                 else
311                         vhdr->h_vlan_encapsulated_proto = htons(len);
312
313                 skb->protocol = htons(ETH_P_8021Q);
314                 skb_reset_network_header(skb);
315         }
316
317         /* Before delegating work to the lower layer, enter our MAC-address */
318         if (saddr == NULL)
319                 saddr = dev->dev_addr;
320
321         dev = vlan_dev_info(dev)->real_dev;
322
323         /* MPLS can send us skbuffs w/out enough space. This check will grow
324          * the skb if it doesn't have enough headroom. Not a beautiful solution,
325          * so I'll tick a counter so that users can know it's happening...
326          * If they care...
327          */
328
329         /* NOTE: This may still break if the underlying device is not the final
330          * device (and thus there are more headers to add...) It should work for
331          * good-ole-ethernet though.
332          */
333         if (skb_headroom(skb) < dev->hard_header_len) {
334                 struct sk_buff *sk_tmp = skb;
335                 skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
336                 kfree_skb(sk_tmp);
337                 if (skb == NULL) {
338                         struct net_device_stats *stats = &vdev->stats;
339                         stats->tx_dropped++;
340                         return -ENOMEM;
341                 }
342                 vlan_dev_info(vdev)->cnt_inc_headroom_on_tx++;
343                 pr_debug("%s: %s: had to grow skb\n", __FUNCTION__, vdev->name);
344         }
345
346         if (build_vlan_header) {
347                 /* Now make the underlying real hard header */
348                 rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr,
349                                      len + VLAN_HLEN);
350                 if (rc > 0)
351                         rc += VLAN_HLEN;
352                 else if (rc < 0)
353                         rc -= VLAN_HLEN;
354         } else
355                 /* If here, then we'll just make a normal looking ethernet
356                  * frame, but, the hard_start_xmit method will insert the tag
357                  * (it has to be able to do this for bridged and other skbs
358                  * that don't come down the protocol stack in an orderly manner.
359                  */
360                 rc = dev_hard_header(skb, dev, type, daddr, saddr, len);
361
362         return rc;
363 }
364
365 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
366 {
367         struct net_device_stats *stats = &dev->stats;
368         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
369         DECLARE_MAC_BUF(mac);
370         DECLARE_MAC_BUF(mac2);
371         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
372          *
373          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
374          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
375          */
376
377         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
378                 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
379                 int orig_headroom = skb_headroom(skb);
380                 unsigned short veth_TCI;
381
382                 /* This is not a VLAN frame...but we can fix that! */
383                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
384
385                 pr_debug("%s: proto to encap: 0x%hx\n",
386                          __FUNCTION__, htons(veth->h_vlan_proto));
387                 /* Construct the second two bytes. This field looks something
388                  * like:
389                  * usr_priority: 3 bits  (high bits)
390                  * CFI           1 bit
391                  * VLAN ID       12 bits (low bits)
392                  */
393                 veth_TCI = vlan_dev_info(dev)->vlan_id;
394                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
395
396                 skb = __vlan_put_tag(skb, veth_TCI);
397                 if (!skb) {
398                         stats->tx_dropped++;
399                         return 0;
400                 }
401
402                 if (orig_headroom < VLAN_HLEN)
403                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
404         }
405
406         pr_debug("%s: about to send skb: %p to dev: %s\n",
407                 __FUNCTION__, skb, skb->dev->name);
408         pr_debug("  %s %s %4hx %4hx %4hx\n",
409                  print_mac(mac, veth->h_dest), print_mac(mac2, veth->h_source),
410                  veth->h_vlan_proto, veth->h_vlan_TCI,
411                  veth->h_vlan_encapsulated_proto);
412
413         stats->tx_packets++; /* for statics only */
414         stats->tx_bytes += skb->len;
415
416         skb->dev = vlan_dev_info(dev)->real_dev;
417         dev_queue_xmit(skb);
418
419         return 0;
420 }
421
422 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
423                                             struct net_device *dev)
424 {
425         struct net_device_stats *stats = &dev->stats;
426         unsigned short veth_TCI;
427
428         /* Construct the second two bytes. This field looks something
429          * like:
430          * usr_priority: 3 bits  (high bits)
431          * CFI           1 bit
432          * VLAN ID       12 bits (low bits)
433          */
434         veth_TCI = vlan_dev_info(dev)->vlan_id;
435         veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
436         skb = __vlan_hwaccel_put_tag(skb, veth_TCI);
437
438         stats->tx_packets++;
439         stats->tx_bytes += skb->len;
440
441         skb->dev = vlan_dev_info(dev)->real_dev;
442         dev_queue_xmit(skb);
443
444         return 0;
445 }
446
447 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
448 {
449         /* TODO: gotta make sure the underlying layer can handle it,
450          * maybe an IFF_VLAN_CAPABLE flag for devices?
451          */
452         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
453                 return -ERANGE;
454
455         dev->mtu = new_mtu;
456
457         return 0;
458 }
459
460 void vlan_dev_set_ingress_priority(const struct net_device *dev,
461                                    u32 skb_prio, short vlan_prio)
462 {
463         struct vlan_dev_info *vlan = vlan_dev_info(dev);
464
465         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
466                 vlan->nr_ingress_mappings--;
467         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
468                 vlan->nr_ingress_mappings++;
469
470         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
471 }
472
473 int vlan_dev_set_egress_priority(const struct net_device *dev,
474                                  u32 skb_prio, short vlan_prio)
475 {
476         struct vlan_dev_info *vlan = vlan_dev_info(dev);
477         struct vlan_priority_tci_mapping *mp = NULL;
478         struct vlan_priority_tci_mapping *np;
479         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
480
481         /* See if a priority mapping exists.. */
482         mp = vlan->egress_priority_map[skb_prio & 0xF];
483         while (mp) {
484                 if (mp->priority == skb_prio) {
485                         if (mp->vlan_qos && !vlan_qos)
486                                 vlan->nr_egress_mappings--;
487                         else if (!mp->vlan_qos && vlan_qos)
488                                 vlan->nr_egress_mappings++;
489                         mp->vlan_qos = vlan_qos;
490                         return 0;
491                 }
492                 mp = mp->next;
493         }
494
495         /* Create a new mapping then. */
496         mp = vlan->egress_priority_map[skb_prio & 0xF];
497         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
498         if (!np)
499                 return -ENOBUFS;
500
501         np->next = mp;
502         np->priority = skb_prio;
503         np->vlan_qos = vlan_qos;
504         vlan->egress_priority_map[skb_prio & 0xF] = np;
505         if (vlan_qos)
506                 vlan->nr_egress_mappings++;
507         return 0;
508 }
509
510 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
511 int vlan_dev_set_vlan_flag(const struct net_device *dev,
512                            u32 flag, short flag_val)
513 {
514         /* verify flag is supported */
515         if (flag == VLAN_FLAG_REORDER_HDR) {
516                 if (flag_val)
517                         vlan_dev_info(dev)->flags |= VLAN_FLAG_REORDER_HDR;
518                 else
519                         vlan_dev_info(dev)->flags &= ~VLAN_FLAG_REORDER_HDR;
520                 return 0;
521         }
522         return -EINVAL;
523 }
524
525 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
526 {
527         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
528 }
529
530 void vlan_dev_get_vid(const struct net_device *dev, unsigned short *result)
531 {
532         *result = vlan_dev_info(dev)->vlan_id;
533 }
534
535 static int vlan_dev_open(struct net_device *dev)
536 {
537         struct vlan_dev_info *vlan = vlan_dev_info(dev);
538         struct net_device *real_dev = vlan->real_dev;
539         int err;
540
541         if (!(real_dev->flags & IFF_UP))
542                 return -ENETDOWN;
543
544         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
545                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
546                 if (err < 0)
547                         return err;
548         }
549         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
550
551         if (dev->flags & IFF_ALLMULTI)
552                 dev_set_allmulti(real_dev, 1);
553         if (dev->flags & IFF_PROMISC)
554                 dev_set_promiscuity(real_dev, 1);
555
556         return 0;
557 }
558
559 static int vlan_dev_stop(struct net_device *dev)
560 {
561         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
562
563         dev_mc_unsync(real_dev, dev);
564         dev_unicast_unsync(real_dev, dev);
565         if (dev->flags & IFF_ALLMULTI)
566                 dev_set_allmulti(real_dev, -1);
567         if (dev->flags & IFF_PROMISC)
568                 dev_set_promiscuity(real_dev, -1);
569
570         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
571                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
572
573         return 0;
574 }
575
576 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
577 {
578         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
579         struct sockaddr *addr = p;
580         int err;
581
582         if (!is_valid_ether_addr(addr->sa_data))
583                 return -EADDRNOTAVAIL;
584
585         if (!(dev->flags & IFF_UP))
586                 goto out;
587
588         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
589                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
590                 if (err < 0)
591                         return err;
592         }
593
594         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
595                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
596
597 out:
598         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
599         return 0;
600 }
601
602 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
603 {
604         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
605         struct ifreq ifrr;
606         int err = -EOPNOTSUPP;
607
608         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
609         ifrr.ifr_ifru = ifr->ifr_ifru;
610
611         switch (cmd) {
612         case SIOCGMIIPHY:
613         case SIOCGMIIREG:
614         case SIOCSMIIREG:
615                 if (real_dev->do_ioctl && netif_device_present(real_dev))
616                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
617                 break;
618         }
619
620         if (!err)
621                 ifr->ifr_ifru = ifrr.ifr_ifru;
622
623         return err;
624 }
625
626 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
627 {
628         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
629
630         if (change & IFF_ALLMULTI)
631                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
632         if (change & IFF_PROMISC)
633                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
634 }
635
636 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
637 {
638         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
639         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
640 }
641
642 /*
643  * vlan network devices have devices nesting below it, and are a special
644  * "super class" of normal network devices; split their locks off into a
645  * separate class since they always nest.
646  */
647 static struct lock_class_key vlan_netdev_xmit_lock_key;
648
649 static const struct header_ops vlan_header_ops = {
650         .create  = vlan_dev_hard_header,
651         .rebuild = vlan_dev_rebuild_header,
652         .parse   = eth_header_parse,
653 };
654
655 static int vlan_dev_init(struct net_device *dev)
656 {
657         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
658         int subclass = 0;
659
660         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
661         dev->flags  = real_dev->flags & ~IFF_UP;
662         dev->iflink = real_dev->ifindex;
663         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
664                                           (1<<__LINK_STATE_DORMANT))) |
665                       (1<<__LINK_STATE_PRESENT);
666
667         /* ipv6 shared card related stuff */
668         dev->dev_id = real_dev->dev_id;
669
670         if (is_zero_ether_addr(dev->dev_addr))
671                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
672         if (is_zero_ether_addr(dev->broadcast))
673                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
674
675         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
676                 dev->header_ops      = real_dev->header_ops;
677                 dev->hard_header_len = real_dev->hard_header_len;
678                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
679         } else {
680                 dev->header_ops      = &vlan_header_ops;
681                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
682                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
683         }
684
685         if (real_dev->priv_flags & IFF_802_1Q_VLAN)
686                 subclass = 1;
687
688         lockdep_set_class_and_subclass(&dev->_xmit_lock,
689                                 &vlan_netdev_xmit_lock_key, subclass);
690         return 0;
691 }
692
693 void vlan_setup(struct net_device *dev)
694 {
695         ether_setup(dev);
696
697         dev->priv_flags         |= IFF_802_1Q_VLAN;
698         dev->tx_queue_len       = 0;
699
700         dev->change_mtu         = vlan_dev_change_mtu;
701         dev->init               = vlan_dev_init;
702         dev->open               = vlan_dev_open;
703         dev->stop               = vlan_dev_stop;
704         dev->set_mac_address    = vlan_dev_set_mac_address;
705         dev->set_rx_mode        = vlan_dev_set_rx_mode;
706         dev->set_multicast_list = vlan_dev_set_rx_mode;
707         dev->change_rx_flags    = vlan_dev_change_rx_flags;
708         dev->do_ioctl           = vlan_dev_ioctl;
709         dev->destructor         = free_netdev;
710
711         memset(dev->broadcast, 0, ETH_ALEN);
712 }