vlan: move struct vlan_dev_info to private header
[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_shared(skb) || skb_cloned(skb)) {
78                         struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
79                         kfree_skb(skb);
80                         skb = nskb;
81                 }
82                 if (skb) {
83                         /* Lifted from Gleb's VLAN code... */
84                         memmove(skb->data - ETH_HLEN,
85                                 skb->data - VLAN_ETH_HLEN, 12);
86                         skb->mac_header += VLAN_HLEN;
87                 }
88         }
89
90         return skb;
91 }
92
93 static inline void vlan_set_encap_proto(struct sk_buff *skb,
94                 struct vlan_hdr *vhdr)
95 {
96         __be16 proto;
97         unsigned char *rawp;
98
99         /*
100          * Was a VLAN packet, grab the encapsulated protocol, which the layer
101          * three protocols care about.
102          */
103
104         proto = vhdr->h_vlan_encapsulated_proto;
105         if (ntohs(proto) >= 1536) {
106                 skb->protocol = proto;
107                 return;
108         }
109
110         rawp = skb->data;
111         if (*(unsigned short *)rawp == 0xFFFF)
112                 /*
113                  * This is a magic hack to spot IPX packets. Older Novell
114                  * breaks the protocol design and runs IPX over 802.3 without
115                  * an 802.2 LLC layer. We look for FFFF which isn't a used
116                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
117                  * but does for the rest.
118                  */
119                 skb->protocol = htons(ETH_P_802_3);
120         else
121                 /*
122                  * Real 802.2 LLC
123                  */
124                 skb->protocol = htons(ETH_P_802_2);
125 }
126
127 /*
128  *      Determine the packet's protocol ID. The rule here is that we
129  *      assume 802.3 if the type field is short enough to be a length.
130  *      This is normal practice and works for any 'now in use' protocol.
131  *
132  *  Also, at this point we assume that we ARE dealing exclusively with
133  *  VLAN packets, or packets that should be made into VLAN packets based
134  *  on a default VLAN ID.
135  *
136  *  NOTE:  Should be similar to ethernet/eth.c.
137  *
138  *  SANITY NOTE:  This method is called when a packet is moving up the stack
139  *                towards userland.  To get here, it would have already passed
140  *                through the ethernet/eth.c eth_type_trans() method.
141  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
142  *                 stored UNALIGNED in the memory.  RISC systems don't like
143  *                 such cases very much...
144  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
145  *                  aligned, so there doesn't need to be any of the unaligned
146  *                  stuff.  It has been commented out now...  --Ben
147  *
148  */
149 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
150                   struct packet_type *ptype, struct net_device *orig_dev)
151 {
152         struct vlan_hdr *vhdr;
153         unsigned short vid;
154         struct net_device_stats *stats;
155         unsigned short vlan_TCI;
156
157         skb = skb_share_check(skb, GFP_ATOMIC);
158         if (skb == NULL)
159                 goto err_free;
160
161         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
162                 goto err_free;
163
164         vhdr = (struct vlan_hdr *)skb->data;
165         vlan_TCI = ntohs(vhdr->h_vlan_TCI);
166         vid = (vlan_TCI & VLAN_VID_MASK);
167
168         rcu_read_lock();
169         skb->dev = __find_vlan_dev(dev, vid);
170         if (!skb->dev) {
171                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
172                          __func__, (unsigned int)vid, dev->name);
173                 goto err_unlock;
174         }
175
176         skb->dev->last_rx = jiffies;
177
178         stats = &skb->dev->stats;
179         stats->rx_packets++;
180         stats->rx_bytes += skb->len;
181
182         skb_pull_rcsum(skb, VLAN_HLEN);
183
184         skb->priority = vlan_get_ingress_priority(skb->dev,
185                                                   ntohs(vhdr->h_vlan_TCI));
186
187         pr_debug("%s: priority: %u for TCI: %hu\n",
188                  __func__, skb->priority, ntohs(vhdr->h_vlan_TCI));
189
190         switch (skb->pkt_type) {
191         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
192                 /* stats->broadcast ++; // no such counter :-( */
193                 break;
194
195         case PACKET_MULTICAST:
196                 stats->multicast++;
197                 break;
198
199         case PACKET_OTHERHOST:
200                 /* Our lower layer thinks this is not local, let's make sure.
201                  * This allows the VLAN to have a different MAC than the
202                  * underlying device, and still route correctly.
203                  */
204                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
205                                         skb->dev->dev_addr))
206                         skb->pkt_type = PACKET_HOST;
207                 break;
208         default:
209                 break;
210         }
211
212         vlan_set_encap_proto(skb, vhdr);
213
214         skb = vlan_check_reorder_header(skb);
215         if (!skb) {
216                 stats->rx_errors++;
217                 goto err_unlock;
218         }
219
220         netif_rx(skb);
221         rcu_read_unlock();
222         return NET_RX_SUCCESS;
223
224 err_unlock:
225         rcu_read_unlock();
226 err_free:
227         kfree_skb(skb);
228         return NET_RX_DROP;
229 }
230
231 static inline unsigned short
232 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
233 {
234         struct vlan_priority_tci_mapping *mp;
235
236         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
237         while (mp) {
238                 if (mp->priority == skb->priority) {
239                         return mp->vlan_qos; /* This should already be shifted
240                                               * to mask correctly with the
241                                               * VLAN's TCI */
242                 }
243                 mp = mp->next;
244         }
245         return 0;
246 }
247
248 /*
249  *      Create the VLAN header for an arbitrary protocol layer
250  *
251  *      saddr=NULL      means use device source address
252  *      daddr=NULL      means leave destination address (eg unresolved arp)
253  *
254  *  This is called when the SKB is moving down the stack towards the
255  *  physical devices.
256  */
257 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
258                                 unsigned short type,
259                                 const void *daddr, const void *saddr,
260                                 unsigned int len)
261 {
262         struct vlan_hdr *vhdr;
263         unsigned short veth_TCI = 0;
264         int rc = 0;
265         int build_vlan_header = 0;
266         struct net_device *vdev = dev;
267
268         pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n",
269                  __func__, skb, type, len, vlan_dev_info(dev)->vlan_id,
270                  daddr);
271
272         /* build vlan header only if re_order_header flag is NOT set.  This
273          * fixes some programs that get confused when they see a VLAN device
274          * sending a frame that is VLAN encoded (the consensus is that the VLAN
275          * device should look completely like an Ethernet device when the
276          * REORDER_HEADER flag is set)  The drawback to this is some extra
277          * header shuffling in the hard_start_xmit.  Users can turn off this
278          * REORDER behaviour with the vconfig tool.
279          */
280         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR))
281                 build_vlan_header = 1;
282
283         if (build_vlan_header) {
284                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
285
286                 /* build the four bytes that make this a VLAN header. */
287
288                 /* Now, construct the second two bytes. This field looks
289                  * something like:
290                  * usr_priority: 3 bits  (high bits)
291                  * CFI           1 bit
292                  * VLAN ID       12 bits (low bits)
293                  *
294                  */
295                 veth_TCI = vlan_dev_info(dev)->vlan_id;
296                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
297
298                 vhdr->h_vlan_TCI = htons(veth_TCI);
299
300                 /*
301                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
302                  *  put the length in here instead. It is up to the 802.2
303                  *  layer to carry protocol information.
304                  */
305
306                 if (type != ETH_P_802_3)
307                         vhdr->h_vlan_encapsulated_proto = htons(type);
308                 else
309                         vhdr->h_vlan_encapsulated_proto = htons(len);
310
311                 skb->protocol = htons(ETH_P_8021Q);
312         }
313
314         /* Before delegating work to the lower layer, enter our MAC-address */
315         if (saddr == NULL)
316                 saddr = dev->dev_addr;
317
318         dev = vlan_dev_info(dev)->real_dev;
319
320         /* MPLS can send us skbuffs w/out enough space. This check will grow
321          * the skb if it doesn't have enough headroom. Not a beautiful solution,
322          * so I'll tick a counter so that users can know it's happening...
323          * If they care...
324          */
325
326         /* NOTE: This may still break if the underlying device is not the final
327          * device (and thus there are more headers to add...) It should work for
328          * good-ole-ethernet though.
329          */
330         if (skb_headroom(skb) < dev->hard_header_len) {
331                 struct sk_buff *sk_tmp = skb;
332                 skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
333                 kfree_skb(sk_tmp);
334                 if (skb == NULL) {
335                         struct net_device_stats *stats = &vdev->stats;
336                         stats->tx_dropped++;
337                         return -ENOMEM;
338                 }
339                 vlan_dev_info(vdev)->cnt_inc_headroom_on_tx++;
340                 pr_debug("%s: %s: had to grow skb\n", __func__, vdev->name);
341         }
342
343         if (build_vlan_header) {
344                 /* Now make the underlying real hard header */
345                 rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr,
346                                      len + VLAN_HLEN);
347                 if (rc > 0)
348                         rc += VLAN_HLEN;
349                 else if (rc < 0)
350                         rc -= VLAN_HLEN;
351         } else
352                 /* If here, then we'll just make a normal looking ethernet
353                  * frame, but, the hard_start_xmit method will insert the tag
354                  * (it has to be able to do this for bridged and other skbs
355                  * that don't come down the protocol stack in an orderly manner.
356                  */
357                 rc = dev_hard_header(skb, dev, type, daddr, saddr, len);
358
359         return rc;
360 }
361
362 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
363 {
364         struct net_device_stats *stats = &dev->stats;
365         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
366
367         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
368          *
369          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
370          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
371          */
372
373         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
374                 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
375                 int orig_headroom = skb_headroom(skb);
376                 unsigned short veth_TCI;
377
378                 /* This is not a VLAN frame...but we can fix that! */
379                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
380
381                 pr_debug("%s: proto to encap: 0x%hx\n",
382                          __func__, ntohs(veth->h_vlan_proto));
383                 /* Construct the second two bytes. This field looks something
384                  * like:
385                  * usr_priority: 3 bits  (high bits)
386                  * CFI           1 bit
387                  * VLAN ID       12 bits (low bits)
388                  */
389                 veth_TCI = vlan_dev_info(dev)->vlan_id;
390                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
391
392                 skb = __vlan_put_tag(skb, veth_TCI);
393                 if (!skb) {
394                         stats->tx_dropped++;
395                         return 0;
396                 }
397
398                 if (orig_headroom < VLAN_HLEN)
399                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
400         }
401
402         pr_debug("%s: about to send skb: %p to dev: %s\n",
403                 __func__, skb, skb->dev->name);
404         pr_debug("  " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n",
405                  veth->h_dest[0], veth->h_dest[1], veth->h_dest[2],
406                  veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
407                  veth->h_source[0], veth->h_source[1], veth->h_source[2],
408                  veth->h_source[3], veth->h_source[4], veth->h_source[5],
409                  veth->h_vlan_proto, veth->h_vlan_TCI,
410                  veth->h_vlan_encapsulated_proto);
411
412         stats->tx_packets++; /* for statics only */
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_hwaccel_hard_start_xmit(struct sk_buff *skb,
422                                             struct net_device *dev)
423 {
424         struct net_device_stats *stats = &dev->stats;
425         unsigned short veth_TCI;
426
427         /* Construct the second two bytes. This field looks something
428          * like:
429          * usr_priority: 3 bits  (high bits)
430          * CFI           1 bit
431          * VLAN ID       12 bits (low bits)
432          */
433         veth_TCI = vlan_dev_info(dev)->vlan_id;
434         veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
435         skb = __vlan_hwaccel_put_tag(skb, veth_TCI);
436
437         stats->tx_packets++;
438         stats->tx_bytes += skb->len;
439
440         skb->dev = vlan_dev_info(dev)->real_dev;
441         dev_queue_xmit(skb);
442
443         return 0;
444 }
445
446 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
447 {
448         /* TODO: gotta make sure the underlying layer can handle it,
449          * maybe an IFF_VLAN_CAPABLE flag for devices?
450          */
451         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
452                 return -ERANGE;
453
454         dev->mtu = new_mtu;
455
456         return 0;
457 }
458
459 void vlan_dev_set_ingress_priority(const struct net_device *dev,
460                                    u32 skb_prio, short vlan_prio)
461 {
462         struct vlan_dev_info *vlan = vlan_dev_info(dev);
463
464         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
465                 vlan->nr_ingress_mappings--;
466         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
467                 vlan->nr_ingress_mappings++;
468
469         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
470 }
471
472 int vlan_dev_set_egress_priority(const struct net_device *dev,
473                                  u32 skb_prio, short vlan_prio)
474 {
475         struct vlan_dev_info *vlan = vlan_dev_info(dev);
476         struct vlan_priority_tci_mapping *mp = NULL;
477         struct vlan_priority_tci_mapping *np;
478         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
479
480         /* See if a priority mapping exists.. */
481         mp = vlan->egress_priority_map[skb_prio & 0xF];
482         while (mp) {
483                 if (mp->priority == skb_prio) {
484                         if (mp->vlan_qos && !vlan_qos)
485                                 vlan->nr_egress_mappings--;
486                         else if (!mp->vlan_qos && vlan_qos)
487                                 vlan->nr_egress_mappings++;
488                         mp->vlan_qos = vlan_qos;
489                         return 0;
490                 }
491                 mp = mp->next;
492         }
493
494         /* Create a new mapping then. */
495         mp = vlan->egress_priority_map[skb_prio & 0xF];
496         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
497         if (!np)
498                 return -ENOBUFS;
499
500         np->next = mp;
501         np->priority = skb_prio;
502         np->vlan_qos = vlan_qos;
503         vlan->egress_priority_map[skb_prio & 0xF] = np;
504         if (vlan_qos)
505                 vlan->nr_egress_mappings++;
506         return 0;
507 }
508
509 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
510 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
511 {
512         struct vlan_dev_info *vlan = vlan_dev_info(dev);
513         u32 old_flags = vlan->flags;
514
515         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
516                 return -EINVAL;
517
518         vlan->flags = (old_flags & ~mask) | (flags & mask);
519
520         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
521                 if (vlan->flags & VLAN_FLAG_GVRP)
522                         vlan_gvrp_request_join(dev);
523                 else
524                         vlan_gvrp_request_leave(dev);
525         }
526         return 0;
527 }
528
529 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
530 {
531         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
532 }
533
534 static int vlan_dev_open(struct net_device *dev)
535 {
536         struct vlan_dev_info *vlan = vlan_dev_info(dev);
537         struct net_device *real_dev = vlan->real_dev;
538         int err;
539
540         if (!(real_dev->flags & IFF_UP))
541                 return -ENETDOWN;
542
543         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
544                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
545                 if (err < 0)
546                         return err;
547         }
548         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
549
550         if (dev->flags & IFF_ALLMULTI)
551                 dev_set_allmulti(real_dev, 1);
552         if (dev->flags & IFF_PROMISC)
553                 dev_set_promiscuity(real_dev, 1);
554
555         if (vlan->flags & VLAN_FLAG_GVRP)
556                 vlan_gvrp_request_join(dev);
557
558         return 0;
559 }
560
561 static int vlan_dev_stop(struct net_device *dev)
562 {
563         struct vlan_dev_info *vlan = vlan_dev_info(dev);
564         struct net_device *real_dev = vlan->real_dev;
565
566         if (vlan->flags & VLAN_FLAG_GVRP)
567                 vlan_gvrp_request_leave(dev);
568
569         dev_mc_unsync(real_dev, dev);
570         dev_unicast_unsync(real_dev, dev);
571         if (dev->flags & IFF_ALLMULTI)
572                 dev_set_allmulti(real_dev, -1);
573         if (dev->flags & IFF_PROMISC)
574                 dev_set_promiscuity(real_dev, -1);
575
576         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
577                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
578
579         return 0;
580 }
581
582 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
583 {
584         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
585         struct sockaddr *addr = p;
586         int err;
587
588         if (!is_valid_ether_addr(addr->sa_data))
589                 return -EADDRNOTAVAIL;
590
591         if (!(dev->flags & IFF_UP))
592                 goto out;
593
594         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
595                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
596                 if (err < 0)
597                         return err;
598         }
599
600         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
601                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
602
603 out:
604         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
605         return 0;
606 }
607
608 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
609 {
610         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
611         struct ifreq ifrr;
612         int err = -EOPNOTSUPP;
613
614         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
615         ifrr.ifr_ifru = ifr->ifr_ifru;
616
617         switch (cmd) {
618         case SIOCGMIIPHY:
619         case SIOCGMIIREG:
620         case SIOCSMIIREG:
621                 if (real_dev->do_ioctl && netif_device_present(real_dev))
622                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
623                 break;
624         }
625
626         if (!err)
627                 ifr->ifr_ifru = ifrr.ifr_ifru;
628
629         return err;
630 }
631
632 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
633 {
634         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
635
636         if (change & IFF_ALLMULTI)
637                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
638         if (change & IFF_PROMISC)
639                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
640 }
641
642 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
643 {
644         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
645         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
646 }
647
648 /*
649  * vlan network devices have devices nesting below it, and are a special
650  * "super class" of normal network devices; split their locks off into a
651  * separate class since they always nest.
652  */
653 static struct lock_class_key vlan_netdev_xmit_lock_key;
654
655 static const struct header_ops vlan_header_ops = {
656         .create  = vlan_dev_hard_header,
657         .rebuild = vlan_dev_rebuild_header,
658         .parse   = eth_header_parse,
659 };
660
661 static int vlan_dev_init(struct net_device *dev)
662 {
663         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
664         int subclass = 0;
665
666         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
667         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
668         dev->iflink = real_dev->ifindex;
669         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
670                                           (1<<__LINK_STATE_DORMANT))) |
671                       (1<<__LINK_STATE_PRESENT);
672
673         dev->features |= real_dev->features & real_dev->vlan_features;
674
675         /* ipv6 shared card related stuff */
676         dev->dev_id = real_dev->dev_id;
677
678         if (is_zero_ether_addr(dev->dev_addr))
679                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
680         if (is_zero_ether_addr(dev->broadcast))
681                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
682
683         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
684                 dev->header_ops      = real_dev->header_ops;
685                 dev->hard_header_len = real_dev->hard_header_len;
686                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
687         } else {
688                 dev->header_ops      = &vlan_header_ops;
689                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
690                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
691         }
692
693         if (is_vlan_dev(real_dev))
694                 subclass = 1;
695
696         lockdep_set_class_and_subclass(&dev->_xmit_lock,
697                                 &vlan_netdev_xmit_lock_key, subclass);
698         return 0;
699 }
700
701 static void vlan_dev_uninit(struct net_device *dev)
702 {
703         struct vlan_priority_tci_mapping *pm;
704         struct vlan_dev_info *vlan = vlan_dev_info(dev);
705         int i;
706
707         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
708                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
709                         vlan->egress_priority_map[i] = pm->next;
710                         kfree(pm);
711                 }
712         }
713 }
714
715 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
716 {
717         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
718         struct net_device *real_dev = vlan->real_dev;
719
720         if (real_dev->ethtool_ops == NULL ||
721             real_dev->ethtool_ops->get_rx_csum == NULL)
722                 return 0;
723         return real_dev->ethtool_ops->get_rx_csum(real_dev);
724 }
725
726 static const struct ethtool_ops vlan_ethtool_ops = {
727         .get_link               = ethtool_op_get_link,
728         .get_rx_csum            = vlan_ethtool_get_rx_csum,
729 };
730
731 void vlan_setup(struct net_device *dev)
732 {
733         ether_setup(dev);
734
735         dev->priv_flags         |= IFF_802_1Q_VLAN;
736         dev->tx_queue_len       = 0;
737
738         dev->change_mtu         = vlan_dev_change_mtu;
739         dev->init               = vlan_dev_init;
740         dev->uninit             = vlan_dev_uninit;
741         dev->open               = vlan_dev_open;
742         dev->stop               = vlan_dev_stop;
743         dev->set_mac_address    = vlan_dev_set_mac_address;
744         dev->set_rx_mode        = vlan_dev_set_rx_mode;
745         dev->set_multicast_list = vlan_dev_set_rx_mode;
746         dev->change_rx_flags    = vlan_dev_change_rx_flags;
747         dev->do_ioctl           = vlan_dev_ioctl;
748         dev->destructor         = free_netdev;
749         dev->ethtool_ops        = &vlan_ethtool_ops;
750
751         memset(dev->broadcast, 0, ETH_ALEN);
752 }