vlan: Fix vlan-in-vlan crashes.
[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/skbuff.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
28 #include <net/arp.h>
29
30 #include "vlan.h"
31 #include "vlanproc.h"
32 #include <linux/if_vlan.h>
33
34 /*
35  *      Rebuild the Ethernet MAC header. This is called after an ARP
36  *      (or in future other address resolution) has completed on this
37  *      sk_buff. We now let ARP fill in the other fields.
38  *
39  *      This routine CANNOT use cached dst->neigh!
40  *      Really, it is used only when dst->neigh is wrong.
41  *
42  * TODO:  This needs a checkup, I'm ignorant here. --BLG
43  */
44 static int vlan_dev_rebuild_header(struct sk_buff *skb)
45 {
46         struct net_device *dev = skb->dev;
47         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
48
49         switch (veth->h_vlan_encapsulated_proto) {
50 #ifdef CONFIG_INET
51         case htons(ETH_P_IP):
52
53                 /* TODO:  Confirm this will work with VLAN headers... */
54                 return arp_find(veth->h_dest, skb);
55 #endif
56         default:
57                 pr_debug("%s: unable to resolve type %X addresses.\n",
58                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
59
60                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
61                 break;
62         }
63
64         return 0;
65 }
66
67 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
68 {
69         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
70                 if (skb_cow(skb, skb_headroom(skb)) < 0)
71                         skb = NULL;
72                 if (skb) {
73                         /* Lifted from Gleb's VLAN code... */
74                         memmove(skb->data - ETH_HLEN,
75                                 skb->data - VLAN_ETH_HLEN, 12);
76                         skb->mac_header += VLAN_HLEN;
77                 }
78         }
79
80         return skb;
81 }
82
83 static inline void vlan_set_encap_proto(struct sk_buff *skb,
84                 struct vlan_hdr *vhdr)
85 {
86         __be16 proto;
87         unsigned char *rawp;
88
89         /*
90          * Was a VLAN packet, grab the encapsulated protocol, which the layer
91          * three protocols care about.
92          */
93
94         proto = vhdr->h_vlan_encapsulated_proto;
95         if (ntohs(proto) >= 1536) {
96                 skb->protocol = proto;
97                 return;
98         }
99
100         rawp = skb->data;
101         if (*(unsigned short *)rawp == 0xFFFF)
102                 /*
103                  * This is a magic hack to spot IPX packets. Older Novell
104                  * breaks the protocol design and runs IPX over 802.3 without
105                  * an 802.2 LLC layer. We look for FFFF which isn't a used
106                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
107                  * but does for the rest.
108                  */
109                 skb->protocol = htons(ETH_P_802_3);
110         else
111                 /*
112                  * Real 802.2 LLC
113                  */
114                 skb->protocol = htons(ETH_P_802_2);
115 }
116
117 /*
118  *      Determine the packet's protocol ID. The rule here is that we
119  *      assume 802.3 if the type field is short enough to be a length.
120  *      This is normal practice and works for any 'now in use' protocol.
121  *
122  *  Also, at this point we assume that we ARE dealing exclusively with
123  *  VLAN packets, or packets that should be made into VLAN packets based
124  *  on a default VLAN ID.
125  *
126  *  NOTE:  Should be similar to ethernet/eth.c.
127  *
128  *  SANITY NOTE:  This method is called when a packet is moving up the stack
129  *                towards userland.  To get here, it would have already passed
130  *                through the ethernet/eth.c eth_type_trans() method.
131  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
132  *                 stored UNALIGNED in the memory.  RISC systems don't like
133  *                 such cases very much...
134  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
135  *                  aligned, so there doesn't need to be any of the unaligned
136  *                  stuff.  It has been commented out now...  --Ben
137  *
138  */
139 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
140                   struct packet_type *ptype, struct net_device *orig_dev)
141 {
142         struct vlan_hdr *vhdr;
143         struct net_device_stats *stats;
144         u16 vlan_id;
145         u16 vlan_tci;
146
147         skb = skb_share_check(skb, GFP_ATOMIC);
148         if (skb == NULL)
149                 goto err_free;
150
151         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
152                 goto err_free;
153
154         vhdr = (struct vlan_hdr *)skb->data;
155         vlan_tci = ntohs(vhdr->h_vlan_TCI);
156         vlan_id = vlan_tci & VLAN_VID_MASK;
157
158         rcu_read_lock();
159         skb->dev = __find_vlan_dev(dev, vlan_id);
160         if (!skb->dev) {
161                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
162                          __func__, vlan_id, dev->name);
163                 goto err_unlock;
164         }
165
166         stats = &skb->dev->stats;
167         stats->rx_packets++;
168         stats->rx_bytes += skb->len;
169
170         skb_pull_rcsum(skb, VLAN_HLEN);
171
172         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
173
174         pr_debug("%s: priority: %u for TCI: %hu\n",
175                  __func__, skb->priority, vlan_tci);
176
177         switch (skb->pkt_type) {
178         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
179                 /* stats->broadcast ++; // no such counter :-( */
180                 break;
181
182         case PACKET_MULTICAST:
183                 stats->multicast++;
184                 break;
185
186         case PACKET_OTHERHOST:
187                 /* Our lower layer thinks this is not local, let's make sure.
188                  * This allows the VLAN to have a different MAC than the
189                  * underlying device, and still route correctly.
190                  */
191                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
192                                         skb->dev->dev_addr))
193                         skb->pkt_type = PACKET_HOST;
194                 break;
195         default:
196                 break;
197         }
198
199         vlan_set_encap_proto(skb, vhdr);
200
201         skb = vlan_check_reorder_header(skb);
202         if (!skb) {
203                 stats->rx_errors++;
204                 goto err_unlock;
205         }
206
207         netif_rx(skb);
208         rcu_read_unlock();
209         return NET_RX_SUCCESS;
210
211 err_unlock:
212         rcu_read_unlock();
213 err_free:
214         kfree_skb(skb);
215         return NET_RX_DROP;
216 }
217
218 static inline u16
219 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
220 {
221         struct vlan_priority_tci_mapping *mp;
222
223         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
224         while (mp) {
225                 if (mp->priority == skb->priority) {
226                         return mp->vlan_qos; /* This should already be shifted
227                                               * to mask correctly with the
228                                               * VLAN's TCI */
229                 }
230                 mp = mp->next;
231         }
232         return 0;
233 }
234
235 /*
236  *      Create the VLAN header for an arbitrary protocol layer
237  *
238  *      saddr=NULL      means use device source address
239  *      daddr=NULL      means leave destination address (eg unresolved arp)
240  *
241  *  This is called when the SKB is moving down the stack towards the
242  *  physical devices.
243  */
244 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
245                                 unsigned short type,
246                                 const void *daddr, const void *saddr,
247                                 unsigned int len)
248 {
249         struct vlan_hdr *vhdr;
250         unsigned int vhdrlen = 0;
251         u16 vlan_tci = 0;
252         int rc;
253
254         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
255                 return -ENOSPC;
256
257         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
258                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
259
260                 vlan_tci = vlan_dev_info(dev)->vlan_id;
261                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
262                 vhdr->h_vlan_TCI = htons(vlan_tci);
263
264                 /*
265                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
266                  *  put the length in here instead. It is up to the 802.2
267                  *  layer to carry protocol information.
268                  */
269                 if (type != ETH_P_802_3)
270                         vhdr->h_vlan_encapsulated_proto = htons(type);
271                 else
272                         vhdr->h_vlan_encapsulated_proto = htons(len);
273
274                 skb->protocol = htons(ETH_P_8021Q);
275                 type = ETH_P_8021Q;
276                 vhdrlen = VLAN_HLEN;
277         }
278
279         /* Before delegating work to the lower layer, enter our MAC-address */
280         if (saddr == NULL)
281                 saddr = dev->dev_addr;
282
283         /* Now make the underlying real hard header */
284         dev = vlan_dev_info(dev)->real_dev;
285         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
286         if (rc > 0)
287                 rc += vhdrlen;
288         return rc;
289 }
290
291 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
292 {
293         struct net_device_stats *stats = &dev->stats;
294         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
295
296         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
297          *
298          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
299          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
300          */
301         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
302             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
303                 unsigned int orig_headroom = skb_headroom(skb);
304                 u16 vlan_tci;
305
306                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
307
308                 vlan_tci = vlan_dev_info(dev)->vlan_id;
309                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
310                 skb = __vlan_put_tag(skb, vlan_tci);
311                 if (!skb) {
312                         stats->tx_dropped++;
313                         return NETDEV_TX_OK;
314                 }
315
316                 if (orig_headroom < VLAN_HLEN)
317                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
318         }
319
320         stats->tx_packets++;
321         stats->tx_bytes += skb->len;
322
323         skb->dev = vlan_dev_info(dev)->real_dev;
324         dev_queue_xmit(skb);
325         return NETDEV_TX_OK;
326 }
327
328 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
329                                             struct net_device *dev)
330 {
331         struct net_device_stats *stats = &dev->stats;
332         u16 vlan_tci;
333
334         vlan_tci = vlan_dev_info(dev)->vlan_id;
335         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
336         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
337
338         stats->tx_packets++;
339         stats->tx_bytes += skb->len;
340
341         skb->dev = vlan_dev_info(dev)->real_dev;
342         dev_queue_xmit(skb);
343         return NETDEV_TX_OK;
344 }
345
346 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
347 {
348         /* TODO: gotta make sure the underlying layer can handle it,
349          * maybe an IFF_VLAN_CAPABLE flag for devices?
350          */
351         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
352                 return -ERANGE;
353
354         dev->mtu = new_mtu;
355
356         return 0;
357 }
358
359 void vlan_dev_set_ingress_priority(const struct net_device *dev,
360                                    u32 skb_prio, u16 vlan_prio)
361 {
362         struct vlan_dev_info *vlan = vlan_dev_info(dev);
363
364         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
365                 vlan->nr_ingress_mappings--;
366         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
367                 vlan->nr_ingress_mappings++;
368
369         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
370 }
371
372 int vlan_dev_set_egress_priority(const struct net_device *dev,
373                                  u32 skb_prio, u16 vlan_prio)
374 {
375         struct vlan_dev_info *vlan = vlan_dev_info(dev);
376         struct vlan_priority_tci_mapping *mp = NULL;
377         struct vlan_priority_tci_mapping *np;
378         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
379
380         /* See if a priority mapping exists.. */
381         mp = vlan->egress_priority_map[skb_prio & 0xF];
382         while (mp) {
383                 if (mp->priority == skb_prio) {
384                         if (mp->vlan_qos && !vlan_qos)
385                                 vlan->nr_egress_mappings--;
386                         else if (!mp->vlan_qos && vlan_qos)
387                                 vlan->nr_egress_mappings++;
388                         mp->vlan_qos = vlan_qos;
389                         return 0;
390                 }
391                 mp = mp->next;
392         }
393
394         /* Create a new mapping then. */
395         mp = vlan->egress_priority_map[skb_prio & 0xF];
396         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
397         if (!np)
398                 return -ENOBUFS;
399
400         np->next = mp;
401         np->priority = skb_prio;
402         np->vlan_qos = vlan_qos;
403         vlan->egress_priority_map[skb_prio & 0xF] = np;
404         if (vlan_qos)
405                 vlan->nr_egress_mappings++;
406         return 0;
407 }
408
409 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
410 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
411 {
412         struct vlan_dev_info *vlan = vlan_dev_info(dev);
413         u32 old_flags = vlan->flags;
414
415         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
416                 return -EINVAL;
417
418         vlan->flags = (old_flags & ~mask) | (flags & mask);
419
420         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
421                 if (vlan->flags & VLAN_FLAG_GVRP)
422                         vlan_gvrp_request_join(dev);
423                 else
424                         vlan_gvrp_request_leave(dev);
425         }
426         return 0;
427 }
428
429 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
430 {
431         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
432 }
433
434 static int vlan_dev_open(struct net_device *dev)
435 {
436         struct vlan_dev_info *vlan = vlan_dev_info(dev);
437         struct net_device *real_dev = vlan->real_dev;
438         int err;
439
440         if (!(real_dev->flags & IFF_UP))
441                 return -ENETDOWN;
442
443         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
444                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
445                 if (err < 0)
446                         goto out;
447         }
448
449         if (dev->flags & IFF_ALLMULTI) {
450                 err = dev_set_allmulti(real_dev, 1);
451                 if (err < 0)
452                         goto del_unicast;
453         }
454         if (dev->flags & IFF_PROMISC) {
455                 err = dev_set_promiscuity(real_dev, 1);
456                 if (err < 0)
457                         goto clear_allmulti;
458         }
459
460         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
461
462         if (vlan->flags & VLAN_FLAG_GVRP)
463                 vlan_gvrp_request_join(dev);
464
465         return 0;
466
467 clear_allmulti:
468         if (dev->flags & IFF_ALLMULTI)
469                 dev_set_allmulti(real_dev, -1);
470 del_unicast:
471         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
472                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
473 out:
474         return err;
475 }
476
477 static int vlan_dev_stop(struct net_device *dev)
478 {
479         struct vlan_dev_info *vlan = vlan_dev_info(dev);
480         struct net_device *real_dev = vlan->real_dev;
481
482         if (vlan->flags & VLAN_FLAG_GVRP)
483                 vlan_gvrp_request_leave(dev);
484
485         dev_mc_unsync(real_dev, dev);
486         dev_unicast_unsync(real_dev, dev);
487         if (dev->flags & IFF_ALLMULTI)
488                 dev_set_allmulti(real_dev, -1);
489         if (dev->flags & IFF_PROMISC)
490                 dev_set_promiscuity(real_dev, -1);
491
492         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
493                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
494
495         return 0;
496 }
497
498 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
499 {
500         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
501         struct sockaddr *addr = p;
502         int err;
503
504         if (!is_valid_ether_addr(addr->sa_data))
505                 return -EADDRNOTAVAIL;
506
507         if (!(dev->flags & IFF_UP))
508                 goto out;
509
510         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
511                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
512                 if (err < 0)
513                         return err;
514         }
515
516         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
517                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
518
519 out:
520         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
521         return 0;
522 }
523
524 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
525 {
526         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
527         const struct net_device_ops *ops = real_dev->netdev_ops;
528         struct ifreq ifrr;
529         int err = -EOPNOTSUPP;
530
531         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
532         ifrr.ifr_ifru = ifr->ifr_ifru;
533
534         switch (cmd) {
535         case SIOCGMIIPHY:
536         case SIOCGMIIREG:
537         case SIOCSMIIREG:
538                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
539                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
540                 break;
541         }
542
543         if (!err)
544                 ifr->ifr_ifru = ifrr.ifr_ifru;
545
546         return err;
547 }
548
549 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
550 {
551         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
552         const struct net_device_ops *ops = real_dev->netdev_ops;
553         int err = 0;
554
555         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
556                 err = ops->ndo_neigh_setup(real_dev, pa);
557
558         return err;
559 }
560
561 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
562 {
563         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
564
565         if (change & IFF_ALLMULTI)
566                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
567         if (change & IFF_PROMISC)
568                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
569 }
570
571 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
572 {
573         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
574         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
575 }
576
577 /*
578  * vlan network devices have devices nesting below it, and are a special
579  * "super class" of normal network devices; split their locks off into a
580  * separate class since they always nest.
581  */
582 static struct lock_class_key vlan_netdev_xmit_lock_key;
583 static struct lock_class_key vlan_netdev_addr_lock_key;
584
585 static void vlan_dev_set_lockdep_one(struct net_device *dev,
586                                      struct netdev_queue *txq,
587                                      void *_subclass)
588 {
589         lockdep_set_class_and_subclass(&txq->_xmit_lock,
590                                        &vlan_netdev_xmit_lock_key,
591                                        *(int *)_subclass);
592 }
593
594 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
595 {
596         lockdep_set_class_and_subclass(&dev->addr_list_lock,
597                                        &vlan_netdev_addr_lock_key,
598                                        subclass);
599         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
600 }
601
602 static const struct header_ops vlan_header_ops = {
603         .create  = vlan_dev_hard_header,
604         .rebuild = vlan_dev_rebuild_header,
605         .parse   = eth_header_parse,
606 };
607
608 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops;
609
610 static int vlan_dev_init(struct net_device *dev)
611 {
612         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
613         int subclass = 0;
614
615         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
616         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
617         dev->iflink = real_dev->ifindex;
618         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
619                                           (1<<__LINK_STATE_DORMANT))) |
620                       (1<<__LINK_STATE_PRESENT);
621
622         dev->features |= real_dev->features & real_dev->vlan_features;
623         dev->gso_max_size = real_dev->gso_max_size;
624
625         /* ipv6 shared card related stuff */
626         dev->dev_id = real_dev->dev_id;
627
628         if (is_zero_ether_addr(dev->dev_addr))
629                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
630         if (is_zero_ether_addr(dev->broadcast))
631                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
632
633         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
634                 dev->header_ops      = real_dev->header_ops;
635                 dev->hard_header_len = real_dev->hard_header_len;
636                 dev->netdev_ops         = &vlan_netdev_accel_ops;
637         } else {
638                 dev->header_ops      = &vlan_header_ops;
639                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
640                 dev->netdev_ops         = &vlan_netdev_ops;
641         }
642         netdev_resync_ops(dev);
643
644         if (is_vlan_dev(real_dev))
645                 subclass = 1;
646
647         vlan_dev_set_lockdep_class(dev, subclass);
648         return 0;
649 }
650
651 static void vlan_dev_uninit(struct net_device *dev)
652 {
653         struct vlan_priority_tci_mapping *pm;
654         struct vlan_dev_info *vlan = vlan_dev_info(dev);
655         int i;
656
657         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
658                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
659                         vlan->egress_priority_map[i] = pm->next;
660                         kfree(pm);
661                 }
662         }
663 }
664
665 static int vlan_ethtool_get_settings(struct net_device *dev,
666                                      struct ethtool_cmd *cmd)
667 {
668         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
669         struct net_device *real_dev = vlan->real_dev;
670
671         if (!real_dev->ethtool_ops->get_settings)
672                 return -EOPNOTSUPP;
673
674         return real_dev->ethtool_ops->get_settings(real_dev, cmd);
675 }
676
677 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
678                                      struct ethtool_drvinfo *info)
679 {
680         strcpy(info->driver, vlan_fullname);
681         strcpy(info->version, vlan_version);
682         strcpy(info->fw_version, "N/A");
683 }
684
685 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
686 {
687         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
688         struct net_device *real_dev = vlan->real_dev;
689
690         if (real_dev->ethtool_ops == NULL ||
691             real_dev->ethtool_ops->get_rx_csum == NULL)
692                 return 0;
693         return real_dev->ethtool_ops->get_rx_csum(real_dev);
694 }
695
696 static u32 vlan_ethtool_get_flags(struct net_device *dev)
697 {
698         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
699         struct net_device *real_dev = vlan->real_dev;
700
701         if (!(real_dev->features & NETIF_F_HW_VLAN_RX) ||
702             real_dev->ethtool_ops == NULL ||
703             real_dev->ethtool_ops->get_flags == NULL)
704                 return 0;
705         return real_dev->ethtool_ops->get_flags(real_dev);
706 }
707
708 static const struct ethtool_ops vlan_ethtool_ops = {
709         .get_settings           = vlan_ethtool_get_settings,
710         .get_drvinfo            = vlan_ethtool_get_drvinfo,
711         .get_link               = ethtool_op_get_link,
712         .get_rx_csum            = vlan_ethtool_get_rx_csum,
713         .get_flags              = vlan_ethtool_get_flags,
714 };
715
716 static const struct net_device_ops vlan_netdev_ops = {
717         .ndo_change_mtu         = vlan_dev_change_mtu,
718         .ndo_init               = vlan_dev_init,
719         .ndo_uninit             = vlan_dev_uninit,
720         .ndo_open               = vlan_dev_open,
721         .ndo_stop               = vlan_dev_stop,
722         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
723         .ndo_validate_addr      = eth_validate_addr,
724         .ndo_set_mac_address    = vlan_dev_set_mac_address,
725         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
726         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
727         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
728         .ndo_do_ioctl           = vlan_dev_ioctl,
729         .ndo_neigh_setup        = vlan_dev_neigh_setup,
730 };
731
732 static const struct net_device_ops vlan_netdev_accel_ops = {
733         .ndo_change_mtu         = vlan_dev_change_mtu,
734         .ndo_init               = vlan_dev_init,
735         .ndo_uninit             = vlan_dev_uninit,
736         .ndo_open               = vlan_dev_open,
737         .ndo_stop               = vlan_dev_stop,
738         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
739         .ndo_validate_addr      = eth_validate_addr,
740         .ndo_set_mac_address    = vlan_dev_set_mac_address,
741         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
742         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
743         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
744         .ndo_do_ioctl           = vlan_dev_ioctl,
745         .ndo_neigh_setup        = vlan_dev_neigh_setup,
746 };
747
748 void vlan_setup(struct net_device *dev)
749 {
750         ether_setup(dev);
751
752         dev->priv_flags         |= IFF_802_1Q_VLAN;
753         dev->tx_queue_len       = 0;
754
755         dev->netdev_ops         = &vlan_netdev_ops;
756         dev->destructor         = free_netdev;
757         dev->ethtool_ops        = &vlan_ethtool_ops;
758
759         memset(dev->broadcast, 0, ETH_ALEN);
760 }