29b6348c8d4d6f280c3e349a6518c6b5ce3d75c1
[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/slab.h>
25 #include <linux/skbuff.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/ethtool.h>
29 #include <net/arp.h>
30
31 #include "vlan.h"
32 #include "vlanproc.h"
33 #include <linux/if_vlan.h>
34
35 /*
36  *      Rebuild the Ethernet MAC header. This is called after an ARP
37  *      (or in future other address resolution) has completed on this
38  *      sk_buff. We now let ARP fill in the other fields.
39  *
40  *      This routine CANNOT use cached dst->neigh!
41  *      Really, it is used only when dst->neigh is wrong.
42  *
43  * TODO:  This needs a checkup, I'm ignorant here. --BLG
44  */
45 static int vlan_dev_rebuild_header(struct sk_buff *skb)
46 {
47         struct net_device *dev = skb->dev;
48         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
49
50         switch (veth->h_vlan_encapsulated_proto) {
51 #ifdef CONFIG_INET
52         case htons(ETH_P_IP):
53
54                 /* TODO:  Confirm this will work with VLAN headers... */
55                 return arp_find(veth->h_dest, skb);
56 #endif
57         default:
58                 pr_debug("%s: unable to resolve type %X addresses.\n",
59                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
60
61                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
62                 break;
63         }
64
65         return 0;
66 }
67
68 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
69 {
70         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
71                 if (skb_cow(skb, skb_headroom(skb)) < 0)
72                         skb = NULL;
73                 if (skb) {
74                         /* Lifted from Gleb's VLAN code... */
75                         memmove(skb->data - ETH_HLEN,
76                                 skb->data - VLAN_ETH_HLEN, 12);
77                         skb->mac_header += VLAN_HLEN;
78                 }
79         }
80
81         return skb;
82 }
83
84 static inline void vlan_set_encap_proto(struct sk_buff *skb,
85                 struct vlan_hdr *vhdr)
86 {
87         __be16 proto;
88         unsigned char *rawp;
89
90         /*
91          * Was a VLAN packet, grab the encapsulated protocol, which the layer
92          * three protocols care about.
93          */
94
95         proto = vhdr->h_vlan_encapsulated_proto;
96         if (ntohs(proto) >= 1536) {
97                 skb->protocol = proto;
98                 return;
99         }
100
101         rawp = skb->data;
102         if (*(unsigned short *)rawp == 0xFFFF)
103                 /*
104                  * This is a magic hack to spot IPX packets. Older Novell
105                  * breaks the protocol design and runs IPX over 802.3 without
106                  * an 802.2 LLC layer. We look for FFFF which isn't a used
107                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
108                  * but does for the rest.
109                  */
110                 skb->protocol = htons(ETH_P_802_3);
111         else
112                 /*
113                  * Real 802.2 LLC
114                  */
115                 skb->protocol = htons(ETH_P_802_2);
116 }
117
118 /*
119  *      Determine the packet's protocol ID. The rule here is that we
120  *      assume 802.3 if the type field is short enough to be a length.
121  *      This is normal practice and works for any 'now in use' protocol.
122  *
123  *  Also, at this point we assume that we ARE dealing exclusively with
124  *  VLAN packets, or packets that should be made into VLAN packets based
125  *  on a default VLAN ID.
126  *
127  *  NOTE:  Should be similar to ethernet/eth.c.
128  *
129  *  SANITY NOTE:  This method is called when a packet is moving up the stack
130  *                towards userland.  To get here, it would have already passed
131  *                through the ethernet/eth.c eth_type_trans() method.
132  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
133  *                 stored UNALIGNED in the memory.  RISC systems don't like
134  *                 such cases very much...
135  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
136  *                  aligned, so there doesn't need to be any of the unaligned
137  *                  stuff.  It has been commented out now...  --Ben
138  *
139  */
140 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
141                   struct packet_type *ptype, struct net_device *orig_dev)
142 {
143         struct vlan_hdr *vhdr;
144         struct vlan_rx_stats *rx_stats;
145         u16 vlan_id;
146         u16 vlan_tci;
147
148         skb = skb_share_check(skb, GFP_ATOMIC);
149         if (skb == NULL)
150                 goto err_free;
151
152         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
153                 goto err_free;
154
155         vhdr = (struct vlan_hdr *)skb->data;
156         vlan_tci = ntohs(vhdr->h_vlan_TCI);
157         vlan_id = vlan_tci & VLAN_VID_MASK;
158
159         rcu_read_lock();
160         skb->dev = __find_vlan_dev(dev, vlan_id);
161         if (!skb->dev) {
162                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
163                          __func__, vlan_id, dev->name);
164                 goto err_unlock;
165         }
166
167         rx_stats = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats,
168                                smp_processor_id());
169         rx_stats->rx_packets++;
170         rx_stats->rx_bytes += skb->len;
171
172         skb_pull_rcsum(skb, VLAN_HLEN);
173
174         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
175
176         pr_debug("%s: priority: %u for TCI: %hu\n",
177                  __func__, skb->priority, vlan_tci);
178
179         switch (skb->pkt_type) {
180         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
181                 /* stats->broadcast ++; // no such counter :-( */
182                 break;
183
184         case PACKET_MULTICAST:
185                 rx_stats->multicast++;
186                 break;
187
188         case PACKET_OTHERHOST:
189                 /* Our lower layer thinks this is not local, let's make sure.
190                  * This allows the VLAN to have a different MAC than the
191                  * underlying device, and still route correctly.
192                  */
193                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
194                                         skb->dev->dev_addr))
195                         skb->pkt_type = PACKET_HOST;
196                 break;
197         default:
198                 break;
199         }
200
201         vlan_set_encap_proto(skb, vhdr);
202
203         skb = vlan_check_reorder_header(skb);
204         if (!skb) {
205                 rx_stats->rx_errors++;
206                 goto err_unlock;
207         }
208
209         netif_rx(skb);
210         rcu_read_unlock();
211         return NET_RX_SUCCESS;
212
213 err_unlock:
214         rcu_read_unlock();
215 err_free:
216         kfree_skb(skb);
217         return NET_RX_DROP;
218 }
219
220 static inline u16
221 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
222 {
223         struct vlan_priority_tci_mapping *mp;
224
225         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
226         while (mp) {
227                 if (mp->priority == skb->priority) {
228                         return mp->vlan_qos; /* This should already be shifted
229                                               * to mask correctly with the
230                                               * VLAN's TCI */
231                 }
232                 mp = mp->next;
233         }
234         return 0;
235 }
236
237 /*
238  *      Create the VLAN header for an arbitrary protocol layer
239  *
240  *      saddr=NULL      means use device source address
241  *      daddr=NULL      means leave destination address (eg unresolved arp)
242  *
243  *  This is called when the SKB is moving down the stack towards the
244  *  physical devices.
245  */
246 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
247                                 unsigned short type,
248                                 const void *daddr, const void *saddr,
249                                 unsigned int len)
250 {
251         struct vlan_hdr *vhdr;
252         unsigned int vhdrlen = 0;
253         u16 vlan_tci = 0;
254         int rc;
255
256         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
257                 return -ENOSPC;
258
259         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
260                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
261
262                 vlan_tci = vlan_dev_info(dev)->vlan_id;
263                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
264                 vhdr->h_vlan_TCI = htons(vlan_tci);
265
266                 /*
267                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
268                  *  put the length in here instead.
269                  */
270                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
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_set_dev(skb, 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 u16 vlan_dev_select_queue(struct net_device *dev, struct sk_buff *skb)
366 {
367         struct net_device *rdev = vlan_dev_info(dev)->real_dev;
368         const struct net_device_ops *ops = rdev->netdev_ops;
369
370         return ops->ndo_select_queue(rdev, skb);
371 }
372
373 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
374 {
375         /* TODO: gotta make sure the underlying layer can handle it,
376          * maybe an IFF_VLAN_CAPABLE flag for devices?
377          */
378         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
379                 return -ERANGE;
380
381         dev->mtu = new_mtu;
382
383         return 0;
384 }
385
386 void vlan_dev_set_ingress_priority(const struct net_device *dev,
387                                    u32 skb_prio, u16 vlan_prio)
388 {
389         struct vlan_dev_info *vlan = vlan_dev_info(dev);
390
391         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
392                 vlan->nr_ingress_mappings--;
393         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
394                 vlan->nr_ingress_mappings++;
395
396         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
397 }
398
399 int vlan_dev_set_egress_priority(const struct net_device *dev,
400                                  u32 skb_prio, u16 vlan_prio)
401 {
402         struct vlan_dev_info *vlan = vlan_dev_info(dev);
403         struct vlan_priority_tci_mapping *mp = NULL;
404         struct vlan_priority_tci_mapping *np;
405         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
406
407         /* See if a priority mapping exists.. */
408         mp = vlan->egress_priority_map[skb_prio & 0xF];
409         while (mp) {
410                 if (mp->priority == skb_prio) {
411                         if (mp->vlan_qos && !vlan_qos)
412                                 vlan->nr_egress_mappings--;
413                         else if (!mp->vlan_qos && vlan_qos)
414                                 vlan->nr_egress_mappings++;
415                         mp->vlan_qos = vlan_qos;
416                         return 0;
417                 }
418                 mp = mp->next;
419         }
420
421         /* Create a new mapping then. */
422         mp = vlan->egress_priority_map[skb_prio & 0xF];
423         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
424         if (!np)
425                 return -ENOBUFS;
426
427         np->next = mp;
428         np->priority = skb_prio;
429         np->vlan_qos = vlan_qos;
430         vlan->egress_priority_map[skb_prio & 0xF] = np;
431         if (vlan_qos)
432                 vlan->nr_egress_mappings++;
433         return 0;
434 }
435
436 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
437 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
438 {
439         struct vlan_dev_info *vlan = vlan_dev_info(dev);
440         u32 old_flags = vlan->flags;
441
442         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
443                      VLAN_FLAG_LOOSE_BINDING))
444                 return -EINVAL;
445
446         vlan->flags = (old_flags & ~mask) | (flags & mask);
447
448         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
449                 if (vlan->flags & VLAN_FLAG_GVRP)
450                         vlan_gvrp_request_join(dev);
451                 else
452                         vlan_gvrp_request_leave(dev);
453         }
454         return 0;
455 }
456
457 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
458 {
459         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
460 }
461
462 static int vlan_dev_open(struct net_device *dev)
463 {
464         struct vlan_dev_info *vlan = vlan_dev_info(dev);
465         struct net_device *real_dev = vlan->real_dev;
466         int err;
467
468         if (!(real_dev->flags & IFF_UP) &&
469             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
470                 return -ENETDOWN;
471
472         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
473                 err = dev_unicast_add(real_dev, dev->dev_addr);
474                 if (err < 0)
475                         goto out;
476         }
477
478         if (dev->flags & IFF_ALLMULTI) {
479                 err = dev_set_allmulti(real_dev, 1);
480                 if (err < 0)
481                         goto del_unicast;
482         }
483         if (dev->flags & IFF_PROMISC) {
484                 err = dev_set_promiscuity(real_dev, 1);
485                 if (err < 0)
486                         goto clear_allmulti;
487         }
488
489         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
490
491         if (vlan->flags & VLAN_FLAG_GVRP)
492                 vlan_gvrp_request_join(dev);
493
494         netif_carrier_on(dev);
495         return 0;
496
497 clear_allmulti:
498         if (dev->flags & IFF_ALLMULTI)
499                 dev_set_allmulti(real_dev, -1);
500 del_unicast:
501         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
502                 dev_unicast_delete(real_dev, dev->dev_addr);
503 out:
504         netif_carrier_off(dev);
505         return err;
506 }
507
508 static int vlan_dev_stop(struct net_device *dev)
509 {
510         struct vlan_dev_info *vlan = vlan_dev_info(dev);
511         struct net_device *real_dev = vlan->real_dev;
512
513         if (vlan->flags & VLAN_FLAG_GVRP)
514                 vlan_gvrp_request_leave(dev);
515
516         dev_mc_unsync(real_dev, dev);
517         dev_unicast_unsync(real_dev, dev);
518         if (dev->flags & IFF_ALLMULTI)
519                 dev_set_allmulti(real_dev, -1);
520         if (dev->flags & IFF_PROMISC)
521                 dev_set_promiscuity(real_dev, -1);
522
523         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
524                 dev_unicast_delete(real_dev, dev->dev_addr);
525
526         netif_carrier_off(dev);
527         return 0;
528 }
529
530 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
531 {
532         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
533         struct sockaddr *addr = p;
534         int err;
535
536         if (!is_valid_ether_addr(addr->sa_data))
537                 return -EADDRNOTAVAIL;
538
539         if (!(dev->flags & IFF_UP))
540                 goto out;
541
542         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
543                 err = dev_unicast_add(real_dev, addr->sa_data);
544                 if (err < 0)
545                         return err;
546         }
547
548         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
549                 dev_unicast_delete(real_dev, dev->dev_addr);
550
551 out:
552         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
553         return 0;
554 }
555
556 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
557 {
558         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
559         const struct net_device_ops *ops = real_dev->netdev_ops;
560         struct ifreq ifrr;
561         int err = -EOPNOTSUPP;
562
563         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
564         ifrr.ifr_ifru = ifr->ifr_ifru;
565
566         switch (cmd) {
567         case SIOCGMIIPHY:
568         case SIOCGMIIREG:
569         case SIOCSMIIREG:
570                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
571                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
572                 break;
573         }
574
575         if (!err)
576                 ifr->ifr_ifru = ifrr.ifr_ifru;
577
578         return err;
579 }
580
581 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
582 {
583         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
584         const struct net_device_ops *ops = real_dev->netdev_ops;
585         int err = 0;
586
587         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
588                 err = ops->ndo_neigh_setup(real_dev, pa);
589
590         return err;
591 }
592
593 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
594 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
595                                    struct scatterlist *sgl, unsigned int sgc)
596 {
597         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
598         const struct net_device_ops *ops = real_dev->netdev_ops;
599         int rc = 0;
600
601         if (ops->ndo_fcoe_ddp_setup)
602                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
603
604         return rc;
605 }
606
607 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
608 {
609         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
610         const struct net_device_ops *ops = real_dev->netdev_ops;
611         int len = 0;
612
613         if (ops->ndo_fcoe_ddp_done)
614                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
615
616         return len;
617 }
618
619 static int vlan_dev_fcoe_enable(struct net_device *dev)
620 {
621         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
622         const struct net_device_ops *ops = real_dev->netdev_ops;
623         int rc = -EINVAL;
624
625         if (ops->ndo_fcoe_enable)
626                 rc = ops->ndo_fcoe_enable(real_dev);
627         return rc;
628 }
629
630 static int vlan_dev_fcoe_disable(struct net_device *dev)
631 {
632         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
633         const struct net_device_ops *ops = real_dev->netdev_ops;
634         int rc = -EINVAL;
635
636         if (ops->ndo_fcoe_disable)
637                 rc = ops->ndo_fcoe_disable(real_dev);
638         return rc;
639 }
640
641 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
642 {
643         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
644         const struct net_device_ops *ops = real_dev->netdev_ops;
645         int rc = -EINVAL;
646
647         if (ops->ndo_fcoe_get_wwn)
648                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
649         return rc;
650 }
651 #endif
652
653 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
654 {
655         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
656
657         if (change & IFF_ALLMULTI)
658                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
659         if (change & IFF_PROMISC)
660                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
661 }
662
663 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
664 {
665         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
666         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
667 }
668
669 /*
670  * vlan network devices have devices nesting below it, and are a special
671  * "super class" of normal network devices; split their locks off into a
672  * separate class since they always nest.
673  */
674 static struct lock_class_key vlan_netdev_xmit_lock_key;
675 static struct lock_class_key vlan_netdev_addr_lock_key;
676
677 static void vlan_dev_set_lockdep_one(struct net_device *dev,
678                                      struct netdev_queue *txq,
679                                      void *_subclass)
680 {
681         lockdep_set_class_and_subclass(&txq->_xmit_lock,
682                                        &vlan_netdev_xmit_lock_key,
683                                        *(int *)_subclass);
684 }
685
686 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
687 {
688         lockdep_set_class_and_subclass(&dev->addr_list_lock,
689                                        &vlan_netdev_addr_lock_key,
690                                        subclass);
691         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
692 }
693
694 static const struct header_ops vlan_header_ops = {
695         .create  = vlan_dev_hard_header,
696         .rebuild = vlan_dev_rebuild_header,
697         .parse   = eth_header_parse,
698 };
699
700 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops,
701                     vlan_netdev_ops_sq, vlan_netdev_accel_ops_sq;
702
703 static int vlan_dev_init(struct net_device *dev)
704 {
705         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
706         int subclass = 0;
707
708         netif_carrier_off(dev);
709
710         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
711         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
712         dev->iflink = real_dev->ifindex;
713         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
714                                           (1<<__LINK_STATE_DORMANT))) |
715                       (1<<__LINK_STATE_PRESENT);
716
717         dev->features |= real_dev->features & real_dev->vlan_features;
718         dev->gso_max_size = real_dev->gso_max_size;
719
720         /* ipv6 shared card related stuff */
721         dev->dev_id = real_dev->dev_id;
722
723         if (is_zero_ether_addr(dev->dev_addr))
724                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
725         if (is_zero_ether_addr(dev->broadcast))
726                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
727
728 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
729         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
730 #endif
731
732         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
733                 dev->header_ops      = real_dev->header_ops;
734                 dev->hard_header_len = real_dev->hard_header_len;
735                 if (real_dev->netdev_ops->ndo_select_queue)
736                         dev->netdev_ops = &vlan_netdev_accel_ops_sq;
737                 else
738                         dev->netdev_ops = &vlan_netdev_accel_ops;
739         } else {
740                 dev->header_ops      = &vlan_header_ops;
741                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
742                 if (real_dev->netdev_ops->ndo_select_queue)
743                         dev->netdev_ops = &vlan_netdev_ops_sq;
744                 else
745                         dev->netdev_ops = &vlan_netdev_ops;
746         }
747
748         if (is_vlan_dev(real_dev))
749                 subclass = 1;
750
751         vlan_dev_set_lockdep_class(dev, subclass);
752
753         vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats);
754         if (!vlan_dev_info(dev)->vlan_rx_stats)
755                 return -ENOMEM;
756
757         return 0;
758 }
759
760 static void vlan_dev_uninit(struct net_device *dev)
761 {
762         struct vlan_priority_tci_mapping *pm;
763         struct vlan_dev_info *vlan = vlan_dev_info(dev);
764         int i;
765
766         free_percpu(vlan->vlan_rx_stats);
767         vlan->vlan_rx_stats = NULL;
768         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
769                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
770                         vlan->egress_priority_map[i] = pm->next;
771                         kfree(pm);
772                 }
773         }
774 }
775
776 static int vlan_ethtool_get_settings(struct net_device *dev,
777                                      struct ethtool_cmd *cmd)
778 {
779         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
780         return dev_ethtool_get_settings(vlan->real_dev, cmd);
781 }
782
783 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
784                                      struct ethtool_drvinfo *info)
785 {
786         strcpy(info->driver, vlan_fullname);
787         strcpy(info->version, vlan_version);
788         strcpy(info->fw_version, "N/A");
789 }
790
791 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
792 {
793         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
794         return dev_ethtool_get_rx_csum(vlan->real_dev);
795 }
796
797 static u32 vlan_ethtool_get_flags(struct net_device *dev)
798 {
799         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
800         return dev_ethtool_get_flags(vlan->real_dev);
801 }
802
803 static struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
804 {
805         struct net_device_stats *stats = &dev->stats;
806
807         dev_txq_stats_fold(dev, stats);
808
809         if (vlan_dev_info(dev)->vlan_rx_stats) {
810                 struct vlan_rx_stats *p, rx = {0};
811                 int i;
812
813                 for_each_possible_cpu(i) {
814                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i);
815                         rx.rx_packets += p->rx_packets;
816                         rx.rx_bytes   += p->rx_bytes;
817                         rx.rx_errors  += p->rx_errors;
818                         rx.multicast  += p->multicast;
819                 }
820                 stats->rx_packets = rx.rx_packets;
821                 stats->rx_bytes   = rx.rx_bytes;
822                 stats->rx_errors  = rx.rx_errors;
823                 stats->multicast  = rx.multicast;
824         }
825         return stats;
826 }
827
828 static const struct ethtool_ops vlan_ethtool_ops = {
829         .get_settings           = vlan_ethtool_get_settings,
830         .get_drvinfo            = vlan_ethtool_get_drvinfo,
831         .get_link               = ethtool_op_get_link,
832         .get_rx_csum            = vlan_ethtool_get_rx_csum,
833         .get_flags              = vlan_ethtool_get_flags,
834 };
835
836 static const struct net_device_ops vlan_netdev_ops = {
837         .ndo_change_mtu         = vlan_dev_change_mtu,
838         .ndo_init               = vlan_dev_init,
839         .ndo_uninit             = vlan_dev_uninit,
840         .ndo_open               = vlan_dev_open,
841         .ndo_stop               = vlan_dev_stop,
842         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
843         .ndo_validate_addr      = eth_validate_addr,
844         .ndo_set_mac_address    = vlan_dev_set_mac_address,
845         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
846         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
847         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
848         .ndo_do_ioctl           = vlan_dev_ioctl,
849         .ndo_neigh_setup        = vlan_dev_neigh_setup,
850         .ndo_get_stats          = vlan_dev_get_stats,
851 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
852         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
853         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
854         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
855         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
856         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
857 #endif
858 };
859
860 static const struct net_device_ops vlan_netdev_accel_ops = {
861         .ndo_change_mtu         = vlan_dev_change_mtu,
862         .ndo_init               = vlan_dev_init,
863         .ndo_uninit             = vlan_dev_uninit,
864         .ndo_open               = vlan_dev_open,
865         .ndo_stop               = vlan_dev_stop,
866         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
867         .ndo_validate_addr      = eth_validate_addr,
868         .ndo_set_mac_address    = vlan_dev_set_mac_address,
869         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
870         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
871         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
872         .ndo_do_ioctl           = vlan_dev_ioctl,
873         .ndo_neigh_setup        = vlan_dev_neigh_setup,
874         .ndo_get_stats          = vlan_dev_get_stats,
875 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
876         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
877         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
878         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
879         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
880         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
881 #endif
882 };
883
884 static const struct net_device_ops vlan_netdev_ops_sq = {
885         .ndo_select_queue       = vlan_dev_select_queue,
886         .ndo_change_mtu         = vlan_dev_change_mtu,
887         .ndo_init               = vlan_dev_init,
888         .ndo_uninit             = vlan_dev_uninit,
889         .ndo_open               = vlan_dev_open,
890         .ndo_stop               = vlan_dev_stop,
891         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
892         .ndo_validate_addr      = eth_validate_addr,
893         .ndo_set_mac_address    = vlan_dev_set_mac_address,
894         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
895         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
896         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
897         .ndo_do_ioctl           = vlan_dev_ioctl,
898         .ndo_neigh_setup        = vlan_dev_neigh_setup,
899         .ndo_get_stats          = vlan_dev_get_stats,
900 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
901         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
902         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
903         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
904         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
905         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
906 #endif
907 };
908
909 static const struct net_device_ops vlan_netdev_accel_ops_sq = {
910         .ndo_select_queue       = vlan_dev_select_queue,
911         .ndo_change_mtu         = vlan_dev_change_mtu,
912         .ndo_init               = vlan_dev_init,
913         .ndo_uninit             = vlan_dev_uninit,
914         .ndo_open               = vlan_dev_open,
915         .ndo_stop               = vlan_dev_stop,
916         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
917         .ndo_validate_addr      = eth_validate_addr,
918         .ndo_set_mac_address    = vlan_dev_set_mac_address,
919         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
920         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
921         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
922         .ndo_do_ioctl           = vlan_dev_ioctl,
923         .ndo_neigh_setup        = vlan_dev_neigh_setup,
924         .ndo_get_stats          = vlan_dev_get_stats,
925 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
926         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
927         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
928         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
929         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
930         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
931 #endif
932 };
933
934 void vlan_setup(struct net_device *dev)
935 {
936         ether_setup(dev);
937
938         dev->priv_flags         |= IFF_802_1Q_VLAN;
939         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
940         dev->tx_queue_len       = 0;
941
942         dev->netdev_ops         = &vlan_netdev_ops;
943         dev->destructor         = free_netdev;
944         dev->ethtool_ops        = &vlan_ethtool_ops;
945
946         memset(dev->broadcast, 0, ETH_ALEN);
947 }