vlan: eliminate use of dev_base_lock
[linux-2.6.git] / net / 8021q / vlan_dev.c
1 /* -*- linux-c -*-
2  * INET         802.1Q VLAN
3  *              Ethernet-type device handling.
4  *
5  * Authors:     Ben Greear <greearb@candelatech.com>
6  *              Please send support related email to: netdev@vger.kernel.org
7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
8  *
9  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
10  *                - reset skb->pkt_type on incoming packets when MAC was changed
11  *                - see that changed MAC is saddr for outgoing packets
12  *              Oct 20, 2001:  Ard van Breeman:
13  *                - Fix MC-list, finally.
14  *                - Flush MC-list on VLAN destroy.
15  *
16  *
17  *              This program is free software; you can redistribute it and/or
18  *              modify it under the terms of the GNU General Public License
19  *              as published by the Free Software Foundation; either version
20  *              2 of the License, or (at your option) any later version.
21  */
22
23 #include <linux/module.h>
24 #include <linux/skbuff.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
28 #include <net/arp.h>
29
30 #include "vlan.h"
31 #include "vlanproc.h"
32 #include <linux/if_vlan.h>
33
34 /*
35  *      Rebuild the Ethernet MAC header. This is called after an ARP
36  *      (or in future other address resolution) has completed on this
37  *      sk_buff. We now let ARP fill in the other fields.
38  *
39  *      This routine CANNOT use cached dst->neigh!
40  *      Really, it is used only when dst->neigh is wrong.
41  *
42  * TODO:  This needs a checkup, I'm ignorant here. --BLG
43  */
44 static int vlan_dev_rebuild_header(struct sk_buff *skb)
45 {
46         struct net_device *dev = skb->dev;
47         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
48
49         switch (veth->h_vlan_encapsulated_proto) {
50 #ifdef CONFIG_INET
51         case htons(ETH_P_IP):
52
53                 /* TODO:  Confirm this will work with VLAN headers... */
54                 return arp_find(veth->h_dest, skb);
55 #endif
56         default:
57                 pr_debug("%s: unable to resolve type %X addresses.\n",
58                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
59
60                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
61                 break;
62         }
63
64         return 0;
65 }
66
67 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
68 {
69         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
70                 if (skb_cow(skb, skb_headroom(skb)) < 0)
71                         skb = NULL;
72                 if (skb) {
73                         /* Lifted from Gleb's VLAN code... */
74                         memmove(skb->data - ETH_HLEN,
75                                 skb->data - VLAN_ETH_HLEN, 12);
76                         skb->mac_header += VLAN_HLEN;
77                 }
78         }
79
80         return skb;
81 }
82
83 static inline void vlan_set_encap_proto(struct sk_buff *skb,
84                 struct vlan_hdr *vhdr)
85 {
86         __be16 proto;
87         unsigned char *rawp;
88
89         /*
90          * Was a VLAN packet, grab the encapsulated protocol, which the layer
91          * three protocols care about.
92          */
93
94         proto = vhdr->h_vlan_encapsulated_proto;
95         if (ntohs(proto) >= 1536) {
96                 skb->protocol = proto;
97                 return;
98         }
99
100         rawp = skb->data;
101         if (*(unsigned short *)rawp == 0xFFFF)
102                 /*
103                  * This is a magic hack to spot IPX packets. Older Novell
104                  * breaks the protocol design and runs IPX over 802.3 without
105                  * an 802.2 LLC layer. We look for FFFF which isn't a used
106                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
107                  * but does for the rest.
108                  */
109                 skb->protocol = htons(ETH_P_802_3);
110         else
111                 /*
112                  * Real 802.2 LLC
113                  */
114                 skb->protocol = htons(ETH_P_802_2);
115 }
116
117 /*
118  *      Determine the packet's protocol ID. The rule here is that we
119  *      assume 802.3 if the type field is short enough to be a length.
120  *      This is normal practice and works for any 'now in use' protocol.
121  *
122  *  Also, at this point we assume that we ARE dealing exclusively with
123  *  VLAN packets, or packets that should be made into VLAN packets based
124  *  on a default VLAN ID.
125  *
126  *  NOTE:  Should be similar to ethernet/eth.c.
127  *
128  *  SANITY NOTE:  This method is called when a packet is moving up the stack
129  *                towards userland.  To get here, it would have already passed
130  *                through the ethernet/eth.c eth_type_trans() method.
131  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
132  *                 stored UNALIGNED in the memory.  RISC systems don't like
133  *                 such cases very much...
134  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
135  *                  aligned, so there doesn't need to be any of the unaligned
136  *                  stuff.  It has been commented out now...  --Ben
137  *
138  */
139 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
140                   struct packet_type *ptype, struct net_device *orig_dev)
141 {
142         struct vlan_hdr *vhdr;
143         struct net_device_stats *stats;
144         u16 vlan_id;
145         u16 vlan_tci;
146
147         skb = skb_share_check(skb, GFP_ATOMIC);
148         if (skb == NULL)
149                 goto err_free;
150
151         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
152                 goto err_free;
153
154         vhdr = (struct vlan_hdr *)skb->data;
155         vlan_tci = ntohs(vhdr->h_vlan_TCI);
156         vlan_id = vlan_tci & VLAN_VID_MASK;
157
158         rcu_read_lock();
159         skb->dev = __find_vlan_dev(dev, vlan_id);
160         if (!skb->dev) {
161                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
162                          __func__, vlan_id, dev->name);
163                 goto err_unlock;
164         }
165
166         stats = &skb->dev->stats;
167         stats->rx_packets++;
168         stats->rx_bytes += skb->len;
169
170         skb_pull_rcsum(skb, VLAN_HLEN);
171
172         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
173
174         pr_debug("%s: priority: %u for TCI: %hu\n",
175                  __func__, skb->priority, vlan_tci);
176
177         switch (skb->pkt_type) {
178         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
179                 /* stats->broadcast ++; // no such counter :-( */
180                 break;
181
182         case PACKET_MULTICAST:
183                 stats->multicast++;
184                 break;
185
186         case PACKET_OTHERHOST:
187                 /* Our lower layer thinks this is not local, let's make sure.
188                  * This allows the VLAN to have a different MAC than the
189                  * underlying device, and still route correctly.
190                  */
191                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
192                                         skb->dev->dev_addr))
193                         skb->pkt_type = PACKET_HOST;
194                 break;
195         default:
196                 break;
197         }
198
199         vlan_set_encap_proto(skb, vhdr);
200
201         skb = vlan_check_reorder_header(skb);
202         if (!skb) {
203                 stats->rx_errors++;
204                 goto err_unlock;
205         }
206
207         netif_rx(skb);
208         rcu_read_unlock();
209         return NET_RX_SUCCESS;
210
211 err_unlock:
212         rcu_read_unlock();
213 err_free:
214         kfree_skb(skb);
215         return NET_RX_DROP;
216 }
217
218 static inline u16
219 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
220 {
221         struct vlan_priority_tci_mapping *mp;
222
223         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
224         while (mp) {
225                 if (mp->priority == skb->priority) {
226                         return mp->vlan_qos; /* This should already be shifted
227                                               * to mask correctly with the
228                                               * VLAN's TCI */
229                 }
230                 mp = mp->next;
231         }
232         return 0;
233 }
234
235 /*
236  *      Create the VLAN header for an arbitrary protocol layer
237  *
238  *      saddr=NULL      means use device source address
239  *      daddr=NULL      means leave destination address (eg unresolved arp)
240  *
241  *  This is called when the SKB is moving down the stack towards the
242  *  physical devices.
243  */
244 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
245                                 unsigned short type,
246                                 const void *daddr, const void *saddr,
247                                 unsigned int len)
248 {
249         struct vlan_hdr *vhdr;
250         unsigned int vhdrlen = 0;
251         u16 vlan_tci = 0;
252         int rc;
253
254         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
255                 return -ENOSPC;
256
257         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
258                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
259
260                 vlan_tci = vlan_dev_info(dev)->vlan_id;
261                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
262                 vhdr->h_vlan_TCI = htons(vlan_tci);
263
264                 /*
265                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
266                  *  put the length in here instead. It is up to the 802.2
267                  *  layer to carry protocol information.
268                  */
269                 if (type != ETH_P_802_3)
270                         vhdr->h_vlan_encapsulated_proto = htons(type);
271                 else
272                         vhdr->h_vlan_encapsulated_proto = htons(len);
273
274                 skb->protocol = htons(ETH_P_8021Q);
275                 type = ETH_P_8021Q;
276                 vhdrlen = VLAN_HLEN;
277         }
278
279         /* Before delegating work to the lower layer, enter our MAC-address */
280         if (saddr == NULL)
281                 saddr = dev->dev_addr;
282
283         /* Now make the underlying real hard header */
284         dev = vlan_dev_info(dev)->real_dev;
285         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
286         if (rc > 0)
287                 rc += vhdrlen;
288         return rc;
289 }
290
291 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
292                                             struct net_device *dev)
293 {
294         int i = skb_get_queue_mapping(skb);
295         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
296         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
297         unsigned int len;
298         int ret;
299
300         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
301          *
302          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
303          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
304          */
305         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
306             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
307                 unsigned int orig_headroom = skb_headroom(skb);
308                 u16 vlan_tci;
309
310                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
311
312                 vlan_tci = vlan_dev_info(dev)->vlan_id;
313                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
314                 skb = __vlan_put_tag(skb, vlan_tci);
315                 if (!skb) {
316                         txq->tx_dropped++;
317                         return NETDEV_TX_OK;
318                 }
319
320                 if (orig_headroom < VLAN_HLEN)
321                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
322         }
323
324
325         skb->dev = vlan_dev_info(dev)->real_dev;
326         len = skb->len;
327         ret = dev_queue_xmit(skb);
328
329         if (likely(ret == NET_XMIT_SUCCESS)) {
330                 txq->tx_packets++;
331                 txq->tx_bytes += len;
332         } else
333                 txq->tx_dropped++;
334
335         return NETDEV_TX_OK;
336 }
337
338 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
339                                                     struct net_device *dev)
340 {
341         int i = skb_get_queue_mapping(skb);
342         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
343         u16 vlan_tci;
344         unsigned int len;
345         int ret;
346
347         vlan_tci = vlan_dev_info(dev)->vlan_id;
348         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
349         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
350
351         skb->dev = vlan_dev_info(dev)->real_dev;
352         len = skb->len;
353         ret = dev_queue_xmit(skb);
354
355         if (likely(ret == NET_XMIT_SUCCESS)) {
356                 txq->tx_packets++;
357                 txq->tx_bytes += len;
358         } else
359                 txq->tx_dropped++;
360
361         return NETDEV_TX_OK;
362 }
363
364 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
365 {
366         /* TODO: gotta make sure the underlying layer can handle it,
367          * maybe an IFF_VLAN_CAPABLE flag for devices?
368          */
369         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
370                 return -ERANGE;
371
372         dev->mtu = new_mtu;
373
374         return 0;
375 }
376
377 void vlan_dev_set_ingress_priority(const struct net_device *dev,
378                                    u32 skb_prio, u16 vlan_prio)
379 {
380         struct vlan_dev_info *vlan = vlan_dev_info(dev);
381
382         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
383                 vlan->nr_ingress_mappings--;
384         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
385                 vlan->nr_ingress_mappings++;
386
387         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
388 }
389
390 int vlan_dev_set_egress_priority(const struct net_device *dev,
391                                  u32 skb_prio, u16 vlan_prio)
392 {
393         struct vlan_dev_info *vlan = vlan_dev_info(dev);
394         struct vlan_priority_tci_mapping *mp = NULL;
395         struct vlan_priority_tci_mapping *np;
396         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
397
398         /* See if a priority mapping exists.. */
399         mp = vlan->egress_priority_map[skb_prio & 0xF];
400         while (mp) {
401                 if (mp->priority == skb_prio) {
402                         if (mp->vlan_qos && !vlan_qos)
403                                 vlan->nr_egress_mappings--;
404                         else if (!mp->vlan_qos && vlan_qos)
405                                 vlan->nr_egress_mappings++;
406                         mp->vlan_qos = vlan_qos;
407                         return 0;
408                 }
409                 mp = mp->next;
410         }
411
412         /* Create a new mapping then. */
413         mp = vlan->egress_priority_map[skb_prio & 0xF];
414         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
415         if (!np)
416                 return -ENOBUFS;
417
418         np->next = mp;
419         np->priority = skb_prio;
420         np->vlan_qos = vlan_qos;
421         vlan->egress_priority_map[skb_prio & 0xF] = np;
422         if (vlan_qos)
423                 vlan->nr_egress_mappings++;
424         return 0;
425 }
426
427 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
428 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
429 {
430         struct vlan_dev_info *vlan = vlan_dev_info(dev);
431         u32 old_flags = vlan->flags;
432
433         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
434                 return -EINVAL;
435
436         vlan->flags = (old_flags & ~mask) | (flags & mask);
437
438         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
439                 if (vlan->flags & VLAN_FLAG_GVRP)
440                         vlan_gvrp_request_join(dev);
441                 else
442                         vlan_gvrp_request_leave(dev);
443         }
444         return 0;
445 }
446
447 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
448 {
449         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
450 }
451
452 static int vlan_dev_open(struct net_device *dev)
453 {
454         struct vlan_dev_info *vlan = vlan_dev_info(dev);
455         struct net_device *real_dev = vlan->real_dev;
456         int err;
457
458         if (!(real_dev->flags & IFF_UP))
459                 return -ENETDOWN;
460
461         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
462                 err = dev_unicast_add(real_dev, dev->dev_addr);
463                 if (err < 0)
464                         goto out;
465         }
466
467         if (dev->flags & IFF_ALLMULTI) {
468                 err = dev_set_allmulti(real_dev, 1);
469                 if (err < 0)
470                         goto del_unicast;
471         }
472         if (dev->flags & IFF_PROMISC) {
473                 err = dev_set_promiscuity(real_dev, 1);
474                 if (err < 0)
475                         goto clear_allmulti;
476         }
477
478         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
479
480         if (vlan->flags & VLAN_FLAG_GVRP)
481                 vlan_gvrp_request_join(dev);
482
483         netif_carrier_on(dev);
484         return 0;
485
486 clear_allmulti:
487         if (dev->flags & IFF_ALLMULTI)
488                 dev_set_allmulti(real_dev, -1);
489 del_unicast:
490         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
491                 dev_unicast_delete(real_dev, dev->dev_addr);
492 out:
493         netif_carrier_off(dev);
494         return err;
495 }
496
497 static int vlan_dev_stop(struct net_device *dev)
498 {
499         struct vlan_dev_info *vlan = vlan_dev_info(dev);
500         struct net_device *real_dev = vlan->real_dev;
501
502         if (vlan->flags & VLAN_FLAG_GVRP)
503                 vlan_gvrp_request_leave(dev);
504
505         dev_mc_unsync(real_dev, dev);
506         dev_unicast_unsync(real_dev, dev);
507         if (dev->flags & IFF_ALLMULTI)
508                 dev_set_allmulti(real_dev, -1);
509         if (dev->flags & IFF_PROMISC)
510                 dev_set_promiscuity(real_dev, -1);
511
512         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
513                 dev_unicast_delete(real_dev, dev->dev_addr);
514
515         netif_carrier_off(dev);
516         return 0;
517 }
518
519 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
520 {
521         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
522         struct sockaddr *addr = p;
523         int err;
524
525         if (!is_valid_ether_addr(addr->sa_data))
526                 return -EADDRNOTAVAIL;
527
528         if (!(dev->flags & IFF_UP))
529                 goto out;
530
531         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
532                 err = dev_unicast_add(real_dev, addr->sa_data);
533                 if (err < 0)
534                         return err;
535         }
536
537         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
538                 dev_unicast_delete(real_dev, dev->dev_addr);
539
540 out:
541         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
542         return 0;
543 }
544
545 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
546 {
547         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
548         const struct net_device_ops *ops = real_dev->netdev_ops;
549         struct ifreq ifrr;
550         int err = -EOPNOTSUPP;
551
552         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
553         ifrr.ifr_ifru = ifr->ifr_ifru;
554
555         switch (cmd) {
556         case SIOCGMIIPHY:
557         case SIOCGMIIREG:
558         case SIOCSMIIREG:
559                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
560                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
561                 break;
562         }
563
564         if (!err)
565                 ifr->ifr_ifru = ifrr.ifr_ifru;
566
567         return err;
568 }
569
570 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
571 {
572         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
573         const struct net_device_ops *ops = real_dev->netdev_ops;
574         int err = 0;
575
576         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
577                 err = ops->ndo_neigh_setup(real_dev, pa);
578
579         return err;
580 }
581
582 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
583 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
584                                    struct scatterlist *sgl, unsigned int sgc)
585 {
586         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
587         const struct net_device_ops *ops = real_dev->netdev_ops;
588         int rc = 0;
589
590         if (ops->ndo_fcoe_ddp_setup)
591                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
592
593         return rc;
594 }
595
596 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
597 {
598         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
599         const struct net_device_ops *ops = real_dev->netdev_ops;
600         int len = 0;
601
602         if (ops->ndo_fcoe_ddp_done)
603                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
604
605         return len;
606 }
607
608 static int vlan_dev_fcoe_enable(struct net_device *dev)
609 {
610         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
611         const struct net_device_ops *ops = real_dev->netdev_ops;
612         int rc = -EINVAL;
613
614         if (ops->ndo_fcoe_enable)
615                 rc = ops->ndo_fcoe_enable(real_dev);
616         return rc;
617 }
618
619 static int vlan_dev_fcoe_disable(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_disable)
626                 rc = ops->ndo_fcoe_disable(real_dev);
627         return rc;
628 }
629
630 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
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_get_wwn)
637                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
638         return rc;
639 }
640 #endif
641
642 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
643 {
644         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
645
646         if (change & IFF_ALLMULTI)
647                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
648         if (change & IFF_PROMISC)
649                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
650 }
651
652 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
653 {
654         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
655         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
656 }
657
658 /*
659  * vlan network devices have devices nesting below it, and are a special
660  * "super class" of normal network devices; split their locks off into a
661  * separate class since they always nest.
662  */
663 static struct lock_class_key vlan_netdev_xmit_lock_key;
664 static struct lock_class_key vlan_netdev_addr_lock_key;
665
666 static void vlan_dev_set_lockdep_one(struct net_device *dev,
667                                      struct netdev_queue *txq,
668                                      void *_subclass)
669 {
670         lockdep_set_class_and_subclass(&txq->_xmit_lock,
671                                        &vlan_netdev_xmit_lock_key,
672                                        *(int *)_subclass);
673 }
674
675 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
676 {
677         lockdep_set_class_and_subclass(&dev->addr_list_lock,
678                                        &vlan_netdev_addr_lock_key,
679                                        subclass);
680         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
681 }
682
683 static const struct header_ops vlan_header_ops = {
684         .create  = vlan_dev_hard_header,
685         .rebuild = vlan_dev_rebuild_header,
686         .parse   = eth_header_parse,
687 };
688
689 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops;
690
691 static int vlan_dev_init(struct net_device *dev)
692 {
693         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
694         int subclass = 0;
695
696         netif_carrier_off(dev);
697
698         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
699         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
700         dev->iflink = real_dev->ifindex;
701         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
702                                           (1<<__LINK_STATE_DORMANT))) |
703                       (1<<__LINK_STATE_PRESENT);
704
705         dev->features |= real_dev->features & real_dev->vlan_features;
706         dev->gso_max_size = real_dev->gso_max_size;
707
708         /* ipv6 shared card related stuff */
709         dev->dev_id = real_dev->dev_id;
710
711         if (is_zero_ether_addr(dev->dev_addr))
712                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
713         if (is_zero_ether_addr(dev->broadcast))
714                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
715
716 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
717         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
718 #endif
719
720         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
721                 dev->header_ops      = real_dev->header_ops;
722                 dev->hard_header_len = real_dev->hard_header_len;
723                 dev->netdev_ops         = &vlan_netdev_accel_ops;
724         } else {
725                 dev->header_ops      = &vlan_header_ops;
726                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
727                 dev->netdev_ops         = &vlan_netdev_ops;
728         }
729
730         if (is_vlan_dev(real_dev))
731                 subclass = 1;
732
733         vlan_dev_set_lockdep_class(dev, subclass);
734         return 0;
735 }
736
737 static void vlan_dev_uninit(struct net_device *dev)
738 {
739         struct vlan_priority_tci_mapping *pm;
740         struct vlan_dev_info *vlan = vlan_dev_info(dev);
741         int i;
742
743         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
744                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
745                         vlan->egress_priority_map[i] = pm->next;
746                         kfree(pm);
747                 }
748         }
749 }
750
751 static int vlan_ethtool_get_settings(struct net_device *dev,
752                                      struct ethtool_cmd *cmd)
753 {
754         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
755         return dev_ethtool_get_settings(vlan->real_dev, cmd);
756 }
757
758 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
759                                      struct ethtool_drvinfo *info)
760 {
761         strcpy(info->driver, vlan_fullname);
762         strcpy(info->version, vlan_version);
763         strcpy(info->fw_version, "N/A");
764 }
765
766 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
767 {
768         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
769         return dev_ethtool_get_rx_csum(vlan->real_dev);
770 }
771
772 static u32 vlan_ethtool_get_flags(struct net_device *dev)
773 {
774         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
775         return dev_ethtool_get_flags(vlan->real_dev);
776 }
777
778 static const struct ethtool_ops vlan_ethtool_ops = {
779         .get_settings           = vlan_ethtool_get_settings,
780         .get_drvinfo            = vlan_ethtool_get_drvinfo,
781         .get_link               = ethtool_op_get_link,
782         .get_rx_csum            = vlan_ethtool_get_rx_csum,
783         .get_flags              = vlan_ethtool_get_flags,
784 };
785
786 static const struct net_device_ops vlan_netdev_ops = {
787         .ndo_change_mtu         = vlan_dev_change_mtu,
788         .ndo_init               = vlan_dev_init,
789         .ndo_uninit             = vlan_dev_uninit,
790         .ndo_open               = vlan_dev_open,
791         .ndo_stop               = vlan_dev_stop,
792         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
793         .ndo_validate_addr      = eth_validate_addr,
794         .ndo_set_mac_address    = vlan_dev_set_mac_address,
795         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
796         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
797         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
798         .ndo_do_ioctl           = vlan_dev_ioctl,
799         .ndo_neigh_setup        = vlan_dev_neigh_setup,
800 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
801         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
802         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
803         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
804         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
805         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
806 #endif
807 };
808
809 static const struct net_device_ops vlan_netdev_accel_ops = {
810         .ndo_change_mtu         = vlan_dev_change_mtu,
811         .ndo_init               = vlan_dev_init,
812         .ndo_uninit             = vlan_dev_uninit,
813         .ndo_open               = vlan_dev_open,
814         .ndo_stop               = vlan_dev_stop,
815         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
816         .ndo_validate_addr      = eth_validate_addr,
817         .ndo_set_mac_address    = vlan_dev_set_mac_address,
818         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
819         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
820         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
821         .ndo_do_ioctl           = vlan_dev_ioctl,
822         .ndo_neigh_setup        = vlan_dev_neigh_setup,
823 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
824         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
825         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
826         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
827         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
828         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
829 #endif
830 };
831
832 void vlan_setup(struct net_device *dev)
833 {
834         ether_setup(dev);
835
836         dev->priv_flags         |= IFF_802_1Q_VLAN;
837         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
838         dev->tx_queue_len       = 0;
839
840         dev->netdev_ops         = &vlan_netdev_ops;
841         dev->destructor         = free_netdev;
842         dev->ethtool_ops        = &vlan_ethtool_ops;
843
844         memset(dev->broadcast, 0, ETH_ALEN);
845 }