de0dc6bacbe817b2074dfa45010ed1b7c8e64357
[linux-3.10.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 vlan_rx_stats *rx_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         rx_stats = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats,
167                                smp_processor_id());
168         rx_stats->rx_packets++;
169         rx_stats->rx_bytes += skb->len;
170
171         skb_pull_rcsum(skb, VLAN_HLEN);
172
173         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
174
175         pr_debug("%s: priority: %u for TCI: %hu\n",
176                  __func__, skb->priority, vlan_tci);
177
178         switch (skb->pkt_type) {
179         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
180                 /* stats->broadcast ++; // no such counter :-( */
181                 break;
182
183         case PACKET_MULTICAST:
184                 rx_stats->multicast++;
185                 break;
186
187         case PACKET_OTHERHOST:
188                 /* Our lower layer thinks this is not local, let's make sure.
189                  * This allows the VLAN to have a different MAC than the
190                  * underlying device, and still route correctly.
191                  */
192                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
193                                         skb->dev->dev_addr))
194                         skb->pkt_type = PACKET_HOST;
195                 break;
196         default:
197                 break;
198         }
199
200         vlan_set_encap_proto(skb, vhdr);
201
202         skb = vlan_check_reorder_header(skb);
203         if (!skb) {
204                 rx_stats->rx_errors++;
205                 goto err_unlock;
206         }
207
208         netif_rx(skb);
209         rcu_read_unlock();
210         return NET_RX_SUCCESS;
211
212 err_unlock:
213         rcu_read_unlock();
214 err_free:
215         kfree_skb(skb);
216         return NET_RX_DROP;
217 }
218
219 static inline u16
220 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
221 {
222         struct vlan_priority_tci_mapping *mp;
223
224         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
225         while (mp) {
226                 if (mp->priority == skb->priority) {
227                         return mp->vlan_qos; /* This should already be shifted
228                                               * to mask correctly with the
229                                               * VLAN's TCI */
230                 }
231                 mp = mp->next;
232         }
233         return 0;
234 }
235
236 /*
237  *      Create the VLAN header for an arbitrary protocol layer
238  *
239  *      saddr=NULL      means use device source address
240  *      daddr=NULL      means leave destination address (eg unresolved arp)
241  *
242  *  This is called when the SKB is moving down the stack towards the
243  *  physical devices.
244  */
245 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
246                                 unsigned short type,
247                                 const void *daddr, const void *saddr,
248                                 unsigned int len)
249 {
250         struct vlan_hdr *vhdr;
251         unsigned int vhdrlen = 0;
252         u16 vlan_tci = 0;
253         int rc;
254
255         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
256                 return -ENOSPC;
257
258         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
259                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
260
261                 vlan_tci = vlan_dev_info(dev)->vlan_id;
262                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
263                 vhdr->h_vlan_TCI = htons(vlan_tci);
264
265                 /*
266                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
267                  *  put the length in here instead. It is up to the 802.2
268                  *  layer to carry protocol information.
269                  */
270                 if (type != ETH_P_802_3)
271                         vhdr->h_vlan_encapsulated_proto = htons(type);
272                 else
273                         vhdr->h_vlan_encapsulated_proto = htons(len);
274
275                 skb->protocol = htons(ETH_P_8021Q);
276                 type = ETH_P_8021Q;
277                 vhdrlen = VLAN_HLEN;
278         }
279
280         /* Before delegating work to the lower layer, enter our MAC-address */
281         if (saddr == NULL)
282                 saddr = dev->dev_addr;
283
284         /* Now make the underlying real hard header */
285         dev = vlan_dev_info(dev)->real_dev;
286         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
287         if (rc > 0)
288                 rc += vhdrlen;
289         return rc;
290 }
291
292 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
293                                             struct net_device *dev)
294 {
295         int i = skb_get_queue_mapping(skb);
296         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
297         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
298         unsigned int len;
299         int ret;
300
301         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
302          *
303          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
304          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
305          */
306         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
307             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
308                 unsigned int orig_headroom = skb_headroom(skb);
309                 u16 vlan_tci;
310
311                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
312
313                 vlan_tci = vlan_dev_info(dev)->vlan_id;
314                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
315                 skb = __vlan_put_tag(skb, vlan_tci);
316                 if (!skb) {
317                         txq->tx_dropped++;
318                         return NETDEV_TX_OK;
319                 }
320
321                 if (orig_headroom < VLAN_HLEN)
322                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
323         }
324
325
326         skb->dev = vlan_dev_info(dev)->real_dev;
327         len = skb->len;
328         ret = dev_queue_xmit(skb);
329
330         if (likely(ret == NET_XMIT_SUCCESS)) {
331                 txq->tx_packets++;
332                 txq->tx_bytes += len;
333         } else
334                 txq->tx_dropped++;
335
336         return ret;
337 }
338
339 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
340                                                     struct net_device *dev)
341 {
342         int i = skb_get_queue_mapping(skb);
343         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
344         u16 vlan_tci;
345         unsigned int len;
346         int ret;
347
348         vlan_tci = vlan_dev_info(dev)->vlan_id;
349         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
350         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
351
352         skb->dev = vlan_dev_info(dev)->real_dev;
353         len = skb->len;
354         ret = dev_queue_xmit(skb);
355
356         if (likely(ret == NET_XMIT_SUCCESS)) {
357                 txq->tx_packets++;
358                 txq->tx_bytes += len;
359         } else
360                 txq->tx_dropped++;
361
362         return ret;
363 }
364
365 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
366 {
367         /* TODO: gotta make sure the underlying layer can handle it,
368          * maybe an IFF_VLAN_CAPABLE flag for devices?
369          */
370         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
371                 return -ERANGE;
372
373         dev->mtu = new_mtu;
374
375         return 0;
376 }
377
378 void vlan_dev_set_ingress_priority(const struct net_device *dev,
379                                    u32 skb_prio, u16 vlan_prio)
380 {
381         struct vlan_dev_info *vlan = vlan_dev_info(dev);
382
383         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
384                 vlan->nr_ingress_mappings--;
385         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
386                 vlan->nr_ingress_mappings++;
387
388         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
389 }
390
391 int vlan_dev_set_egress_priority(const struct net_device *dev,
392                                  u32 skb_prio, u16 vlan_prio)
393 {
394         struct vlan_dev_info *vlan = vlan_dev_info(dev);
395         struct vlan_priority_tci_mapping *mp = NULL;
396         struct vlan_priority_tci_mapping *np;
397         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
398
399         /* See if a priority mapping exists.. */
400         mp = vlan->egress_priority_map[skb_prio & 0xF];
401         while (mp) {
402                 if (mp->priority == skb_prio) {
403                         if (mp->vlan_qos && !vlan_qos)
404                                 vlan->nr_egress_mappings--;
405                         else if (!mp->vlan_qos && vlan_qos)
406                                 vlan->nr_egress_mappings++;
407                         mp->vlan_qos = vlan_qos;
408                         return 0;
409                 }
410                 mp = mp->next;
411         }
412
413         /* Create a new mapping then. */
414         mp = vlan->egress_priority_map[skb_prio & 0xF];
415         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
416         if (!np)
417                 return -ENOBUFS;
418
419         np->next = mp;
420         np->priority = skb_prio;
421         np->vlan_qos = vlan_qos;
422         vlan->egress_priority_map[skb_prio & 0xF] = np;
423         if (vlan_qos)
424                 vlan->nr_egress_mappings++;
425         return 0;
426 }
427
428 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
429 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
430 {
431         struct vlan_dev_info *vlan = vlan_dev_info(dev);
432         u32 old_flags = vlan->flags;
433
434         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
435                 return -EINVAL;
436
437         vlan->flags = (old_flags & ~mask) | (flags & mask);
438
439         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
440                 if (vlan->flags & VLAN_FLAG_GVRP)
441                         vlan_gvrp_request_join(dev);
442                 else
443                         vlan_gvrp_request_leave(dev);
444         }
445         return 0;
446 }
447
448 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
449 {
450         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
451 }
452
453 static int vlan_dev_open(struct net_device *dev)
454 {
455         struct vlan_dev_info *vlan = vlan_dev_info(dev);
456         struct net_device *real_dev = vlan->real_dev;
457         int err;
458
459         if (!(real_dev->flags & IFF_UP))
460                 return -ENETDOWN;
461
462         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
463                 err = dev_unicast_add(real_dev, dev->dev_addr);
464                 if (err < 0)
465                         goto out;
466         }
467
468         if (dev->flags & IFF_ALLMULTI) {
469                 err = dev_set_allmulti(real_dev, 1);
470                 if (err < 0)
471                         goto del_unicast;
472         }
473         if (dev->flags & IFF_PROMISC) {
474                 err = dev_set_promiscuity(real_dev, 1);
475                 if (err < 0)
476                         goto clear_allmulti;
477         }
478
479         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
480
481         if (vlan->flags & VLAN_FLAG_GVRP)
482                 vlan_gvrp_request_join(dev);
483
484         netif_carrier_on(dev);
485         return 0;
486
487 clear_allmulti:
488         if (dev->flags & IFF_ALLMULTI)
489                 dev_set_allmulti(real_dev, -1);
490 del_unicast:
491         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
492                 dev_unicast_delete(real_dev, dev->dev_addr);
493 out:
494         netif_carrier_off(dev);
495         return err;
496 }
497
498 static int vlan_dev_stop(struct net_device *dev)
499 {
500         struct vlan_dev_info *vlan = vlan_dev_info(dev);
501         struct net_device *real_dev = vlan->real_dev;
502
503         if (vlan->flags & VLAN_FLAG_GVRP)
504                 vlan_gvrp_request_leave(dev);
505
506         dev_mc_unsync(real_dev, dev);
507         dev_unicast_unsync(real_dev, dev);
508         if (dev->flags & IFF_ALLMULTI)
509                 dev_set_allmulti(real_dev, -1);
510         if (dev->flags & IFF_PROMISC)
511                 dev_set_promiscuity(real_dev, -1);
512
513         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
514                 dev_unicast_delete(real_dev, dev->dev_addr);
515
516         netif_carrier_off(dev);
517         return 0;
518 }
519
520 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
521 {
522         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
523         struct sockaddr *addr = p;
524         int err;
525
526         if (!is_valid_ether_addr(addr->sa_data))
527                 return -EADDRNOTAVAIL;
528
529         if (!(dev->flags & IFF_UP))
530                 goto out;
531
532         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
533                 err = dev_unicast_add(real_dev, addr->sa_data);
534                 if (err < 0)
535                         return err;
536         }
537
538         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
539                 dev_unicast_delete(real_dev, dev->dev_addr);
540
541 out:
542         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
543         return 0;
544 }
545
546 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
547 {
548         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
549         const struct net_device_ops *ops = real_dev->netdev_ops;
550         struct ifreq ifrr;
551         int err = -EOPNOTSUPP;
552
553         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
554         ifrr.ifr_ifru = ifr->ifr_ifru;
555
556         switch (cmd) {
557         case SIOCGMIIPHY:
558         case SIOCGMIIREG:
559         case SIOCSMIIREG:
560                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
561                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
562                 break;
563         }
564
565         if (!err)
566                 ifr->ifr_ifru = ifrr.ifr_ifru;
567
568         return err;
569 }
570
571 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
572 {
573         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
574         const struct net_device_ops *ops = real_dev->netdev_ops;
575         int err = 0;
576
577         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
578                 err = ops->ndo_neigh_setup(real_dev, pa);
579
580         return err;
581 }
582
583 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
584 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
585                                    struct scatterlist *sgl, unsigned int sgc)
586 {
587         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
588         const struct net_device_ops *ops = real_dev->netdev_ops;
589         int rc = 0;
590
591         if (ops->ndo_fcoe_ddp_setup)
592                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
593
594         return rc;
595 }
596
597 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
598 {
599         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
600         const struct net_device_ops *ops = real_dev->netdev_ops;
601         int len = 0;
602
603         if (ops->ndo_fcoe_ddp_done)
604                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
605
606         return len;
607 }
608
609 static int vlan_dev_fcoe_enable(struct net_device *dev)
610 {
611         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
612         const struct net_device_ops *ops = real_dev->netdev_ops;
613         int rc = -EINVAL;
614
615         if (ops->ndo_fcoe_enable)
616                 rc = ops->ndo_fcoe_enable(real_dev);
617         return rc;
618 }
619
620 static int vlan_dev_fcoe_disable(struct net_device *dev)
621 {
622         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
623         const struct net_device_ops *ops = real_dev->netdev_ops;
624         int rc = -EINVAL;
625
626         if (ops->ndo_fcoe_disable)
627                 rc = ops->ndo_fcoe_disable(real_dev);
628         return rc;
629 }
630
631 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
632 {
633         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
634         const struct net_device_ops *ops = real_dev->netdev_ops;
635         int rc = -EINVAL;
636
637         if (ops->ndo_fcoe_get_wwn)
638                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
639         return rc;
640 }
641 #endif
642
643 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
644 {
645         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
646
647         if (change & IFF_ALLMULTI)
648                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
649         if (change & IFF_PROMISC)
650                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
651 }
652
653 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
654 {
655         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
656         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
657 }
658
659 /*
660  * vlan network devices have devices nesting below it, and are a special
661  * "super class" of normal network devices; split their locks off into a
662  * separate class since they always nest.
663  */
664 static struct lock_class_key vlan_netdev_xmit_lock_key;
665 static struct lock_class_key vlan_netdev_addr_lock_key;
666
667 static void vlan_dev_set_lockdep_one(struct net_device *dev,
668                                      struct netdev_queue *txq,
669                                      void *_subclass)
670 {
671         lockdep_set_class_and_subclass(&txq->_xmit_lock,
672                                        &vlan_netdev_xmit_lock_key,
673                                        *(int *)_subclass);
674 }
675
676 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
677 {
678         lockdep_set_class_and_subclass(&dev->addr_list_lock,
679                                        &vlan_netdev_addr_lock_key,
680                                        subclass);
681         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
682 }
683
684 static const struct header_ops vlan_header_ops = {
685         .create  = vlan_dev_hard_header,
686         .rebuild = vlan_dev_rebuild_header,
687         .parse   = eth_header_parse,
688 };
689
690 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops;
691
692 static int vlan_dev_init(struct net_device *dev)
693 {
694         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
695         int subclass = 0;
696
697         netif_carrier_off(dev);
698
699         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
700         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
701         dev->iflink = real_dev->ifindex;
702         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
703                                           (1<<__LINK_STATE_DORMANT))) |
704                       (1<<__LINK_STATE_PRESENT);
705
706         dev->features |= real_dev->features & real_dev->vlan_features;
707         dev->gso_max_size = real_dev->gso_max_size;
708
709         /* ipv6 shared card related stuff */
710         dev->dev_id = real_dev->dev_id;
711
712         if (is_zero_ether_addr(dev->dev_addr))
713                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
714         if (is_zero_ether_addr(dev->broadcast))
715                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
716
717 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
718         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
719 #endif
720
721         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
722                 dev->header_ops      = real_dev->header_ops;
723                 dev->hard_header_len = real_dev->hard_header_len;
724                 dev->netdev_ops         = &vlan_netdev_accel_ops;
725         } else {
726                 dev->header_ops      = &vlan_header_ops;
727                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
728                 dev->netdev_ops         = &vlan_netdev_ops;
729         }
730
731         if (is_vlan_dev(real_dev))
732                 subclass = 1;
733
734         vlan_dev_set_lockdep_class(dev, subclass);
735
736         vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats);
737         if (!vlan_dev_info(dev)->vlan_rx_stats)
738                 return -ENOMEM;
739
740         return 0;
741 }
742
743 static void vlan_dev_uninit(struct net_device *dev)
744 {
745         struct vlan_priority_tci_mapping *pm;
746         struct vlan_dev_info *vlan = vlan_dev_info(dev);
747         int i;
748
749         free_percpu(vlan->vlan_rx_stats);
750         vlan->vlan_rx_stats = NULL;
751         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
752                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
753                         vlan->egress_priority_map[i] = pm->next;
754                         kfree(pm);
755                 }
756         }
757 }
758
759 static int vlan_ethtool_get_settings(struct net_device *dev,
760                                      struct ethtool_cmd *cmd)
761 {
762         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
763         return dev_ethtool_get_settings(vlan->real_dev, cmd);
764 }
765
766 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
767                                      struct ethtool_drvinfo *info)
768 {
769         strcpy(info->driver, vlan_fullname);
770         strcpy(info->version, vlan_version);
771         strcpy(info->fw_version, "N/A");
772 }
773
774 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
775 {
776         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
777         return dev_ethtool_get_rx_csum(vlan->real_dev);
778 }
779
780 static u32 vlan_ethtool_get_flags(struct net_device *dev)
781 {
782         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
783         return dev_ethtool_get_flags(vlan->real_dev);
784 }
785
786 static struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
787 {
788         struct net_device_stats *stats = &dev->stats;
789
790         dev_txq_stats_fold(dev, stats);
791
792         if (vlan_dev_info(dev)->vlan_rx_stats) {
793                 struct vlan_rx_stats *p, rx = {0};
794                 int i;
795
796                 for_each_possible_cpu(i) {
797                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i);
798                         rx.rx_packets += p->rx_packets;
799                         rx.rx_bytes   += p->rx_bytes;
800                         rx.rx_errors  += p->rx_errors;
801                         rx.multicast  += p->multicast;
802                 }
803                 stats->rx_packets = rx.rx_packets;
804                 stats->rx_bytes   = rx.rx_bytes;
805                 stats->rx_errors  = rx.rx_errors;
806                 stats->multicast  = rx.multicast;
807         }
808         return stats;
809 }
810
811 static const struct ethtool_ops vlan_ethtool_ops = {
812         .get_settings           = vlan_ethtool_get_settings,
813         .get_drvinfo            = vlan_ethtool_get_drvinfo,
814         .get_link               = ethtool_op_get_link,
815         .get_rx_csum            = vlan_ethtool_get_rx_csum,
816         .get_flags              = vlan_ethtool_get_flags,
817 };
818
819 static const struct net_device_ops vlan_netdev_ops = {
820         .ndo_change_mtu         = vlan_dev_change_mtu,
821         .ndo_init               = vlan_dev_init,
822         .ndo_uninit             = vlan_dev_uninit,
823         .ndo_open               = vlan_dev_open,
824         .ndo_stop               = vlan_dev_stop,
825         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
826         .ndo_validate_addr      = eth_validate_addr,
827         .ndo_set_mac_address    = vlan_dev_set_mac_address,
828         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
829         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
830         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
831         .ndo_do_ioctl           = vlan_dev_ioctl,
832         .ndo_neigh_setup        = vlan_dev_neigh_setup,
833         .ndo_get_stats          = vlan_dev_get_stats,
834 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
835         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
836         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
837         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
838         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
839         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
840 #endif
841 };
842
843 static const struct net_device_ops vlan_netdev_accel_ops = {
844         .ndo_change_mtu         = vlan_dev_change_mtu,
845         .ndo_init               = vlan_dev_init,
846         .ndo_uninit             = vlan_dev_uninit,
847         .ndo_open               = vlan_dev_open,
848         .ndo_stop               = vlan_dev_stop,
849         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
850         .ndo_validate_addr      = eth_validate_addr,
851         .ndo_set_mac_address    = vlan_dev_set_mac_address,
852         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
853         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
854         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
855         .ndo_do_ioctl           = vlan_dev_ioctl,
856         .ndo_neigh_setup        = vlan_dev_neigh_setup,
857         .ndo_get_stats          = vlan_dev_get_stats,
858 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
859         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
860         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
861         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
862         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
863         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
864 #endif
865 };
866
867 void vlan_setup(struct net_device *dev)
868 {
869         ether_setup(dev);
870
871         dev->priv_flags         |= IFF_802_1Q_VLAN;
872         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
873         dev->tx_queue_len       = 0;
874
875         dev->netdev_ops         = &vlan_netdev_ops;
876         dev->destructor         = free_netdev;
877         dev->ethtool_ops        = &vlan_ethtool_ops;
878
879         memset(dev->broadcast, 0, ETH_ALEN);
880 }