vlan: TCI related type and naming cleanups
[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         struct net_device_stats *stats;
154         u16 vlan_id;
155         u16 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         vlan_id = vlan_tci & VLAN_VID_MASK;
167
168         rcu_read_lock();
169         skb->dev = __find_vlan_dev(dev, vlan_id);
170         if (!skb->dev) {
171                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
172                          __func__, vlan_id, 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, vlan_tci);
185
186         pr_debug("%s: priority: %u for TCI: %hu\n",
187                  __func__, skb->priority, vlan_tci);
188
189         switch (skb->pkt_type) {
190         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
191                 /* stats->broadcast ++; // no such counter :-( */
192                 break;
193
194         case PACKET_MULTICAST:
195                 stats->multicast++;
196                 break;
197
198         case PACKET_OTHERHOST:
199                 /* Our lower layer thinks this is not local, let's make sure.
200                  * This allows the VLAN to have a different MAC than the
201                  * underlying device, and still route correctly.
202                  */
203                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
204                                         skb->dev->dev_addr))
205                         skb->pkt_type = PACKET_HOST;
206                 break;
207         default:
208                 break;
209         }
210
211         vlan_set_encap_proto(skb, vhdr);
212
213         skb = vlan_check_reorder_header(skb);
214         if (!skb) {
215                 stats->rx_errors++;
216                 goto err_unlock;
217         }
218
219         netif_rx(skb);
220         rcu_read_unlock();
221         return NET_RX_SUCCESS;
222
223 err_unlock:
224         rcu_read_unlock();
225 err_free:
226         kfree_skb(skb);
227         return NET_RX_DROP;
228 }
229
230 static inline u16
231 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
232 {
233         struct vlan_priority_tci_mapping *mp;
234
235         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
236         while (mp) {
237                 if (mp->priority == skb->priority) {
238                         return mp->vlan_qos; /* This should already be shifted
239                                               * to mask correctly with the
240                                               * VLAN's TCI */
241                 }
242                 mp = mp->next;
243         }
244         return 0;
245 }
246
247 /*
248  *      Create the VLAN header for an arbitrary protocol layer
249  *
250  *      saddr=NULL      means use device source address
251  *      daddr=NULL      means leave destination address (eg unresolved arp)
252  *
253  *  This is called when the SKB is moving down the stack towards the
254  *  physical devices.
255  */
256 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
257                                 unsigned short type,
258                                 const void *daddr, const void *saddr,
259                                 unsigned int len)
260 {
261         struct vlan_hdr *vhdr;
262         u16 vlan_tci = 0;
263         int rc = 0;
264         int build_vlan_header = 0;
265         struct net_device *vdev = dev;
266
267         pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n",
268                  __func__, skb, type, len, vlan_dev_info(dev)->vlan_id,
269                  daddr);
270
271         /* build vlan header only if re_order_header flag is NOT set.  This
272          * fixes some programs that get confused when they see a VLAN device
273          * sending a frame that is VLAN encoded (the consensus is that the VLAN
274          * device should look completely like an Ethernet device when the
275          * REORDER_HEADER flag is set)  The drawback to this is some extra
276          * header shuffling in the hard_start_xmit.  Users can turn off this
277          * REORDER behaviour with the vconfig tool.
278          */
279         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR))
280                 build_vlan_header = 1;
281
282         if (build_vlan_header) {
283                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
284
285                 /* build the four bytes that make this a VLAN header. */
286
287                 /* Now, construct the second two bytes. This field looks
288                  * something like:
289                  * usr_priority: 3 bits  (high bits)
290                  * CFI           1 bit
291                  * VLAN ID       12 bits (low bits)
292                  *
293                  */
294                 vlan_tci = vlan_dev_info(dev)->vlan_id;
295                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
296
297                 vhdr->h_vlan_TCI = htons(vlan_tci);
298
299                 /*
300                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
301                  *  put the length in here instead. It is up to the 802.2
302                  *  layer to carry protocol information.
303                  */
304
305                 if (type != ETH_P_802_3)
306                         vhdr->h_vlan_encapsulated_proto = htons(type);
307                 else
308                         vhdr->h_vlan_encapsulated_proto = htons(len);
309
310                 skb->protocol = htons(ETH_P_8021Q);
311         }
312
313         /* Before delegating work to the lower layer, enter our MAC-address */
314         if (saddr == NULL)
315                 saddr = dev->dev_addr;
316
317         dev = vlan_dev_info(dev)->real_dev;
318
319         /* MPLS can send us skbuffs w/out enough space. This check will grow
320          * the skb if it doesn't have enough headroom. Not a beautiful solution,
321          * so I'll tick a counter so that users can know it's happening...
322          * If they care...
323          */
324
325         /* NOTE: This may still break if the underlying device is not the final
326          * device (and thus there are more headers to add...) It should work for
327          * good-ole-ethernet though.
328          */
329         if (skb_headroom(skb) < dev->hard_header_len) {
330                 struct sk_buff *sk_tmp = skb;
331                 skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
332                 kfree_skb(sk_tmp);
333                 if (skb == NULL) {
334                         struct net_device_stats *stats = &vdev->stats;
335                         stats->tx_dropped++;
336                         return -ENOMEM;
337                 }
338                 vlan_dev_info(vdev)->cnt_inc_headroom_on_tx++;
339                 pr_debug("%s: %s: had to grow skb\n", __func__, vdev->name);
340         }
341
342         if (build_vlan_header) {
343                 /* Now make the underlying real hard header */
344                 rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr,
345                                      len + VLAN_HLEN);
346                 if (rc > 0)
347                         rc += VLAN_HLEN;
348                 else if (rc < 0)
349                         rc -= VLAN_HLEN;
350         } else
351                 /* If here, then we'll just make a normal looking ethernet
352                  * frame, but, the hard_start_xmit method will insert the tag
353                  * (it has to be able to do this for bridged and other skbs
354                  * that don't come down the protocol stack in an orderly manner.
355                  */
356                 rc = dev_hard_header(skb, dev, type, daddr, saddr, len);
357
358         return rc;
359 }
360
361 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
362 {
363         struct net_device_stats *stats = &dev->stats;
364         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
365
366         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
367          *
368          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
369          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
370          */
371
372         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
373                 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
374                 int orig_headroom = skb_headroom(skb);
375                 u16 vlan_tci;
376
377                 /* This is not a VLAN frame...but we can fix that! */
378                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
379
380                 pr_debug("%s: proto to encap: 0x%hx\n",
381                          __func__, ntohs(veth->h_vlan_proto));
382                 /* Construct the second two bytes. This field looks something
383                  * like:
384                  * usr_priority: 3 bits  (high bits)
385                  * CFI           1 bit
386                  * VLAN ID       12 bits (low bits)
387                  */
388                 vlan_tci = vlan_dev_info(dev)->vlan_id;
389                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
390
391                 skb = __vlan_put_tag(skb, vlan_tci);
392                 if (!skb) {
393                         stats->tx_dropped++;
394                         return 0;
395                 }
396
397                 if (orig_headroom < VLAN_HLEN)
398                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
399         }
400
401         pr_debug("%s: about to send skb: %p to dev: %s\n",
402                 __func__, skb, skb->dev->name);
403         pr_debug("  " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n",
404                  veth->h_dest[0], veth->h_dest[1], veth->h_dest[2],
405                  veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
406                  veth->h_source[0], veth->h_source[1], veth->h_source[2],
407                  veth->h_source[3], veth->h_source[4], veth->h_source[5],
408                  veth->h_vlan_proto, veth->h_vlan_TCI,
409                  veth->h_vlan_encapsulated_proto);
410
411         stats->tx_packets++; /* for statics only */
412         stats->tx_bytes += skb->len;
413
414         skb->dev = vlan_dev_info(dev)->real_dev;
415         dev_queue_xmit(skb);
416
417         return 0;
418 }
419
420 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
421                                             struct net_device *dev)
422 {
423         struct net_device_stats *stats = &dev->stats;
424         u16 vlan_tci;
425
426         /* Construct the second two bytes. This field looks something
427          * like:
428          * usr_priority: 3 bits  (high bits)
429          * CFI           1 bit
430          * VLAN ID       12 bits (low bits)
431          */
432         vlan_tci = vlan_dev_info(dev)->vlan_id;
433         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
434         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
435
436         stats->tx_packets++;
437         stats->tx_bytes += skb->len;
438
439         skb->dev = vlan_dev_info(dev)->real_dev;
440         dev_queue_xmit(skb);
441
442         return 0;
443 }
444
445 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
446 {
447         /* TODO: gotta make sure the underlying layer can handle it,
448          * maybe an IFF_VLAN_CAPABLE flag for devices?
449          */
450         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
451                 return -ERANGE;
452
453         dev->mtu = new_mtu;
454
455         return 0;
456 }
457
458 void vlan_dev_set_ingress_priority(const struct net_device *dev,
459                                    u32 skb_prio, u16 vlan_prio)
460 {
461         struct vlan_dev_info *vlan = vlan_dev_info(dev);
462
463         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
464                 vlan->nr_ingress_mappings--;
465         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
466                 vlan->nr_ingress_mappings++;
467
468         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
469 }
470
471 int vlan_dev_set_egress_priority(const struct net_device *dev,
472                                  u32 skb_prio, u16 vlan_prio)
473 {
474         struct vlan_dev_info *vlan = vlan_dev_info(dev);
475         struct vlan_priority_tci_mapping *mp = NULL;
476         struct vlan_priority_tci_mapping *np;
477         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
478
479         /* See if a priority mapping exists.. */
480         mp = vlan->egress_priority_map[skb_prio & 0xF];
481         while (mp) {
482                 if (mp->priority == skb_prio) {
483                         if (mp->vlan_qos && !vlan_qos)
484                                 vlan->nr_egress_mappings--;
485                         else if (!mp->vlan_qos && vlan_qos)
486                                 vlan->nr_egress_mappings++;
487                         mp->vlan_qos = vlan_qos;
488                         return 0;
489                 }
490                 mp = mp->next;
491         }
492
493         /* Create a new mapping then. */
494         mp = vlan->egress_priority_map[skb_prio & 0xF];
495         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
496         if (!np)
497                 return -ENOBUFS;
498
499         np->next = mp;
500         np->priority = skb_prio;
501         np->vlan_qos = vlan_qos;
502         vlan->egress_priority_map[skb_prio & 0xF] = np;
503         if (vlan_qos)
504                 vlan->nr_egress_mappings++;
505         return 0;
506 }
507
508 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
509 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
510 {
511         struct vlan_dev_info *vlan = vlan_dev_info(dev);
512         u32 old_flags = vlan->flags;
513
514         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
515                 return -EINVAL;
516
517         vlan->flags = (old_flags & ~mask) | (flags & mask);
518
519         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
520                 if (vlan->flags & VLAN_FLAG_GVRP)
521                         vlan_gvrp_request_join(dev);
522                 else
523                         vlan_gvrp_request_leave(dev);
524         }
525         return 0;
526 }
527
528 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
529 {
530         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
531 }
532
533 static int vlan_dev_open(struct net_device *dev)
534 {
535         struct vlan_dev_info *vlan = vlan_dev_info(dev);
536         struct net_device *real_dev = vlan->real_dev;
537         int err;
538
539         if (!(real_dev->flags & IFF_UP))
540                 return -ENETDOWN;
541
542         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
543                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
544                 if (err < 0)
545                         return err;
546         }
547         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
548
549         if (dev->flags & IFF_ALLMULTI)
550                 dev_set_allmulti(real_dev, 1);
551         if (dev->flags & IFF_PROMISC)
552                 dev_set_promiscuity(real_dev, 1);
553
554         if (vlan->flags & VLAN_FLAG_GVRP)
555                 vlan_gvrp_request_join(dev);
556
557         return 0;
558 }
559
560 static int vlan_dev_stop(struct net_device *dev)
561 {
562         struct vlan_dev_info *vlan = vlan_dev_info(dev);
563         struct net_device *real_dev = vlan->real_dev;
564
565         if (vlan->flags & VLAN_FLAG_GVRP)
566                 vlan_gvrp_request_leave(dev);
567
568         dev_mc_unsync(real_dev, dev);
569         dev_unicast_unsync(real_dev, dev);
570         if (dev->flags & IFF_ALLMULTI)
571                 dev_set_allmulti(real_dev, -1);
572         if (dev->flags & IFF_PROMISC)
573                 dev_set_promiscuity(real_dev, -1);
574
575         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
576                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
577
578         return 0;
579 }
580
581 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
582 {
583         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
584         struct sockaddr *addr = p;
585         int err;
586
587         if (!is_valid_ether_addr(addr->sa_data))
588                 return -EADDRNOTAVAIL;
589
590         if (!(dev->flags & IFF_UP))
591                 goto out;
592
593         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
594                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
595                 if (err < 0)
596                         return err;
597         }
598
599         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
600                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
601
602 out:
603         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
604         return 0;
605 }
606
607 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
608 {
609         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
610         struct ifreq ifrr;
611         int err = -EOPNOTSUPP;
612
613         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
614         ifrr.ifr_ifru = ifr->ifr_ifru;
615
616         switch (cmd) {
617         case SIOCGMIIPHY:
618         case SIOCGMIIREG:
619         case SIOCSMIIREG:
620                 if (real_dev->do_ioctl && netif_device_present(real_dev))
621                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
622                 break;
623         }
624
625         if (!err)
626                 ifr->ifr_ifru = ifrr.ifr_ifru;
627
628         return err;
629 }
630
631 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
632 {
633         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
634
635         if (change & IFF_ALLMULTI)
636                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
637         if (change & IFF_PROMISC)
638                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
639 }
640
641 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
642 {
643         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
644         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
645 }
646
647 /*
648  * vlan network devices have devices nesting below it, and are a special
649  * "super class" of normal network devices; split their locks off into a
650  * separate class since they always nest.
651  */
652 static struct lock_class_key vlan_netdev_xmit_lock_key;
653
654 static const struct header_ops vlan_header_ops = {
655         .create  = vlan_dev_hard_header,
656         .rebuild = vlan_dev_rebuild_header,
657         .parse   = eth_header_parse,
658 };
659
660 static int vlan_dev_init(struct net_device *dev)
661 {
662         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
663         int subclass = 0;
664
665         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
666         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
667         dev->iflink = real_dev->ifindex;
668         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
669                                           (1<<__LINK_STATE_DORMANT))) |
670                       (1<<__LINK_STATE_PRESENT);
671
672         dev->features |= real_dev->features & real_dev->vlan_features;
673
674         /* ipv6 shared card related stuff */
675         dev->dev_id = real_dev->dev_id;
676
677         if (is_zero_ether_addr(dev->dev_addr))
678                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
679         if (is_zero_ether_addr(dev->broadcast))
680                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
681
682         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
683                 dev->header_ops      = real_dev->header_ops;
684                 dev->hard_header_len = real_dev->hard_header_len;
685                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
686         } else {
687                 dev->header_ops      = &vlan_header_ops;
688                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
689                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
690         }
691
692         if (is_vlan_dev(real_dev))
693                 subclass = 1;
694
695         lockdep_set_class_and_subclass(&dev->_xmit_lock,
696                                 &vlan_netdev_xmit_lock_key, subclass);
697         return 0;
698 }
699
700 static void vlan_dev_uninit(struct net_device *dev)
701 {
702         struct vlan_priority_tci_mapping *pm;
703         struct vlan_dev_info *vlan = vlan_dev_info(dev);
704         int i;
705
706         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
707                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
708                         vlan->egress_priority_map[i] = pm->next;
709                         kfree(pm);
710                 }
711         }
712 }
713
714 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
715 {
716         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
717         struct net_device *real_dev = vlan->real_dev;
718
719         if (real_dev->ethtool_ops == NULL ||
720             real_dev->ethtool_ops->get_rx_csum == NULL)
721                 return 0;
722         return real_dev->ethtool_ops->get_rx_csum(real_dev);
723 }
724
725 static const struct ethtool_ops vlan_ethtool_ops = {
726         .get_link               = ethtool_op_get_link,
727         .get_rx_csum            = vlan_ethtool_get_rx_csum,
728 };
729
730 void vlan_setup(struct net_device *dev)
731 {
732         ether_setup(dev);
733
734         dev->priv_flags         |= IFF_802_1Q_VLAN;
735         dev->tx_queue_len       = 0;
736
737         dev->change_mtu         = vlan_dev_change_mtu;
738         dev->init               = vlan_dev_init;
739         dev->uninit             = vlan_dev_uninit;
740         dev->open               = vlan_dev_open;
741         dev->stop               = vlan_dev_stop;
742         dev->set_mac_address    = vlan_dev_set_mac_address;
743         dev->set_rx_mode        = vlan_dev_set_rx_mode;
744         dev->set_multicast_list = vlan_dev_set_rx_mode;
745         dev->change_rx_flags    = vlan_dev_change_rx_flags;
746         dev->do_ioctl           = vlan_dev_ioctl;
747         dev->destructor         = free_netdev;
748         dev->ethtool_ops        = &vlan_ethtool_ops;
749
750         memset(dev->broadcast, 0, ETH_ALEN);
751 }