Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
[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_pcpu_stats *rx_stats;
145         struct net_device *vlan_dev;
146         u16 vlan_id;
147         u16 vlan_tci;
148
149         skb = skb_share_check(skb, GFP_ATOMIC);
150         if (skb == NULL)
151                 goto err_free;
152
153         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
154                 goto err_free;
155
156         vhdr = (struct vlan_hdr *)skb->data;
157         vlan_tci = ntohs(vhdr->h_vlan_TCI);
158         vlan_id = vlan_tci & VLAN_VID_MASK;
159
160         rcu_read_lock();
161         vlan_dev = vlan_find_dev(dev, vlan_id);
162
163         /* If the VLAN device is defined, we use it.
164          * If not, and the VID is 0, it is a 802.1p packet (not
165          * really a VLAN), so we will just netif_rx it later to the
166          * original interface, but with the skb->proto set to the
167          * wrapped proto: we do nothing here.
168          */
169
170         if (!vlan_dev) {
171                 if (vlan_id) {
172                         pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
173                                  __func__, vlan_id, dev->name);
174                         goto err_unlock;
175                 }
176                 rx_stats = NULL;
177         } else {
178                 skb->dev = vlan_dev;
179
180                 rx_stats = this_cpu_ptr(vlan_dev_info(skb->dev)->vlan_pcpu_stats);
181
182                 u64_stats_update_begin(&rx_stats->syncp);
183                 rx_stats->rx_packets++;
184                 rx_stats->rx_bytes += skb->len;
185
186                 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
187
188                 pr_debug("%s: priority: %u for TCI: %hu\n",
189                          __func__, skb->priority, vlan_tci);
190
191                 switch (skb->pkt_type) {
192                 case PACKET_BROADCAST:
193                         /* Yeah, stats collect these together.. */
194                         /* stats->broadcast ++; // no such counter :-( */
195                         break;
196
197                 case PACKET_MULTICAST:
198                         rx_stats->rx_multicast++;
199                         break;
200
201                 case PACKET_OTHERHOST:
202                         /* Our lower layer thinks this is not local, let's make
203                          * sure.
204                          * This allows the VLAN to have a different MAC than the
205                          * underlying device, and still route correctly.
206                          */
207                         if (!compare_ether_addr(eth_hdr(skb)->h_dest,
208                                                 skb->dev->dev_addr))
209                                 skb->pkt_type = PACKET_HOST;
210                         break;
211                 default:
212                         break;
213                 }
214                 u64_stats_update_end(&rx_stats->syncp);
215         }
216
217         skb_pull_rcsum(skb, VLAN_HLEN);
218         vlan_set_encap_proto(skb, vhdr);
219
220         if (vlan_dev) {
221                 skb = vlan_check_reorder_header(skb);
222                 if (!skb) {
223                         rx_stats->rx_errors++;
224                         goto err_unlock;
225                 }
226         }
227
228         netif_rx(skb);
229
230         rcu_read_unlock();
231         return NET_RX_SUCCESS;
232
233 err_unlock:
234         rcu_read_unlock();
235 err_free:
236         atomic_long_inc(&dev->rx_dropped);
237         kfree_skb(skb);
238         return NET_RX_DROP;
239 }
240
241 static inline u16
242 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
243 {
244         struct vlan_priority_tci_mapping *mp;
245
246         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
247         while (mp) {
248                 if (mp->priority == skb->priority) {
249                         return mp->vlan_qos; /* This should already be shifted
250                                               * to mask correctly with the
251                                               * VLAN's TCI */
252                 }
253                 mp = mp->next;
254         }
255         return 0;
256 }
257
258 /*
259  *      Create the VLAN header for an arbitrary protocol layer
260  *
261  *      saddr=NULL      means use device source address
262  *      daddr=NULL      means leave destination address (eg unresolved arp)
263  *
264  *  This is called when the SKB is moving down the stack towards the
265  *  physical devices.
266  */
267 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
268                                 unsigned short type,
269                                 const void *daddr, const void *saddr,
270                                 unsigned int len)
271 {
272         struct vlan_hdr *vhdr;
273         unsigned int vhdrlen = 0;
274         u16 vlan_tci = 0;
275         int rc;
276
277         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
278                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
279
280                 vlan_tci = vlan_dev_info(dev)->vlan_id;
281                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
282                 vhdr->h_vlan_TCI = htons(vlan_tci);
283
284                 /*
285                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
286                  *  put the length in here instead.
287                  */
288                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
289                         vhdr->h_vlan_encapsulated_proto = htons(type);
290                 else
291                         vhdr->h_vlan_encapsulated_proto = htons(len);
292
293                 skb->protocol = htons(ETH_P_8021Q);
294                 type = ETH_P_8021Q;
295                 vhdrlen = VLAN_HLEN;
296         }
297
298         /* Before delegating work to the lower layer, enter our MAC-address */
299         if (saddr == NULL)
300                 saddr = dev->dev_addr;
301
302         /* Now make the underlying real hard header */
303         dev = vlan_dev_info(dev)->real_dev;
304         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
305         if (rc > 0)
306                 rc += vhdrlen;
307         return rc;
308 }
309
310 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
311                                             struct net_device *dev)
312 {
313         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
314         unsigned int len;
315         int ret;
316
317         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
318          *
319          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
320          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
321          */
322         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
323             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
324                 u16 vlan_tci;
325                 vlan_tci = vlan_dev_info(dev)->vlan_id;
326                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
327                 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
328         }
329
330         skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
331         len = skb->len;
332         ret = dev_queue_xmit(skb);
333
334         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
335                 struct vlan_pcpu_stats *stats;
336
337                 stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats);
338                 u64_stats_update_begin(&stats->syncp);
339                 stats->tx_packets++;
340                 stats->tx_bytes += len;
341                 u64_stats_update_begin(&stats->syncp);
342         } else {
343                 this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped);
344         }
345
346         return ret;
347 }
348
349 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
350 {
351         /* TODO: gotta make sure the underlying layer can handle it,
352          * maybe an IFF_VLAN_CAPABLE flag for devices?
353          */
354         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
355                 return -ERANGE;
356
357         dev->mtu = new_mtu;
358
359         return 0;
360 }
361
362 void vlan_dev_set_ingress_priority(const struct net_device *dev,
363                                    u32 skb_prio, u16 vlan_prio)
364 {
365         struct vlan_dev_info *vlan = vlan_dev_info(dev);
366
367         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
368                 vlan->nr_ingress_mappings--;
369         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
370                 vlan->nr_ingress_mappings++;
371
372         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
373 }
374
375 int vlan_dev_set_egress_priority(const struct net_device *dev,
376                                  u32 skb_prio, u16 vlan_prio)
377 {
378         struct vlan_dev_info *vlan = vlan_dev_info(dev);
379         struct vlan_priority_tci_mapping *mp = NULL;
380         struct vlan_priority_tci_mapping *np;
381         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
382
383         /* See if a priority mapping exists.. */
384         mp = vlan->egress_priority_map[skb_prio & 0xF];
385         while (mp) {
386                 if (mp->priority == skb_prio) {
387                         if (mp->vlan_qos && !vlan_qos)
388                                 vlan->nr_egress_mappings--;
389                         else if (!mp->vlan_qos && vlan_qos)
390                                 vlan->nr_egress_mappings++;
391                         mp->vlan_qos = vlan_qos;
392                         return 0;
393                 }
394                 mp = mp->next;
395         }
396
397         /* Create a new mapping then. */
398         mp = vlan->egress_priority_map[skb_prio & 0xF];
399         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
400         if (!np)
401                 return -ENOBUFS;
402
403         np->next = mp;
404         np->priority = skb_prio;
405         np->vlan_qos = vlan_qos;
406         vlan->egress_priority_map[skb_prio & 0xF] = np;
407         if (vlan_qos)
408                 vlan->nr_egress_mappings++;
409         return 0;
410 }
411
412 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
413 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
414 {
415         struct vlan_dev_info *vlan = vlan_dev_info(dev);
416         u32 old_flags = vlan->flags;
417
418         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
419                      VLAN_FLAG_LOOSE_BINDING))
420                 return -EINVAL;
421
422         vlan->flags = (old_flags & ~mask) | (flags & mask);
423
424         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
425                 if (vlan->flags & VLAN_FLAG_GVRP)
426                         vlan_gvrp_request_join(dev);
427                 else
428                         vlan_gvrp_request_leave(dev);
429         }
430         return 0;
431 }
432
433 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
434 {
435         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
436 }
437
438 static int vlan_dev_open(struct net_device *dev)
439 {
440         struct vlan_dev_info *vlan = vlan_dev_info(dev);
441         struct net_device *real_dev = vlan->real_dev;
442         int err;
443
444         if (!(real_dev->flags & IFF_UP) &&
445             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
446                 return -ENETDOWN;
447
448         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
449                 err = dev_uc_add(real_dev, dev->dev_addr);
450                 if (err < 0)
451                         goto out;
452         }
453
454         if (dev->flags & IFF_ALLMULTI) {
455                 err = dev_set_allmulti(real_dev, 1);
456                 if (err < 0)
457                         goto del_unicast;
458         }
459         if (dev->flags & IFF_PROMISC) {
460                 err = dev_set_promiscuity(real_dev, 1);
461                 if (err < 0)
462                         goto clear_allmulti;
463         }
464
465         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
466
467         if (vlan->flags & VLAN_FLAG_GVRP)
468                 vlan_gvrp_request_join(dev);
469
470         if (netif_carrier_ok(real_dev))
471                 netif_carrier_on(dev);
472         return 0;
473
474 clear_allmulti:
475         if (dev->flags & IFF_ALLMULTI)
476                 dev_set_allmulti(real_dev, -1);
477 del_unicast:
478         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
479                 dev_uc_del(real_dev, dev->dev_addr);
480 out:
481         netif_carrier_off(dev);
482         return err;
483 }
484
485 static int vlan_dev_stop(struct net_device *dev)
486 {
487         struct vlan_dev_info *vlan = vlan_dev_info(dev);
488         struct net_device *real_dev = vlan->real_dev;
489
490         dev_mc_unsync(real_dev, dev);
491         dev_uc_unsync(real_dev, dev);
492         if (dev->flags & IFF_ALLMULTI)
493                 dev_set_allmulti(real_dev, -1);
494         if (dev->flags & IFF_PROMISC)
495                 dev_set_promiscuity(real_dev, -1);
496
497         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
498                 dev_uc_del(real_dev, dev->dev_addr);
499
500         netif_carrier_off(dev);
501         return 0;
502 }
503
504 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
505 {
506         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
507         struct sockaddr *addr = p;
508         int err;
509
510         if (!is_valid_ether_addr(addr->sa_data))
511                 return -EADDRNOTAVAIL;
512
513         if (!(dev->flags & IFF_UP))
514                 goto out;
515
516         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
517                 err = dev_uc_add(real_dev, addr->sa_data);
518                 if (err < 0)
519                         return err;
520         }
521
522         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
523                 dev_uc_del(real_dev, dev->dev_addr);
524
525 out:
526         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
527         return 0;
528 }
529
530 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
531 {
532         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
533         const struct net_device_ops *ops = real_dev->netdev_ops;
534         struct ifreq ifrr;
535         int err = -EOPNOTSUPP;
536
537         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
538         ifrr.ifr_ifru = ifr->ifr_ifru;
539
540         switch (cmd) {
541         case SIOCGMIIPHY:
542         case SIOCGMIIREG:
543         case SIOCSMIIREG:
544                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
545                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
546                 break;
547         }
548
549         if (!err)
550                 ifr->ifr_ifru = ifrr.ifr_ifru;
551
552         return err;
553 }
554
555 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
556 {
557         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
558         const struct net_device_ops *ops = real_dev->netdev_ops;
559         int err = 0;
560
561         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
562                 err = ops->ndo_neigh_setup(real_dev, pa);
563
564         return err;
565 }
566
567 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
568 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
569                                    struct scatterlist *sgl, unsigned int sgc)
570 {
571         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
572         const struct net_device_ops *ops = real_dev->netdev_ops;
573         int rc = 0;
574
575         if (ops->ndo_fcoe_ddp_setup)
576                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
577
578         return rc;
579 }
580
581 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
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 len = 0;
586
587         if (ops->ndo_fcoe_ddp_done)
588                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
589
590         return len;
591 }
592
593 static int vlan_dev_fcoe_enable(struct net_device *dev)
594 {
595         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
596         const struct net_device_ops *ops = real_dev->netdev_ops;
597         int rc = -EINVAL;
598
599         if (ops->ndo_fcoe_enable)
600                 rc = ops->ndo_fcoe_enable(real_dev);
601         return rc;
602 }
603
604 static int vlan_dev_fcoe_disable(struct net_device *dev)
605 {
606         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
607         const struct net_device_ops *ops = real_dev->netdev_ops;
608         int rc = -EINVAL;
609
610         if (ops->ndo_fcoe_disable)
611                 rc = ops->ndo_fcoe_disable(real_dev);
612         return rc;
613 }
614
615 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
616 {
617         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
618         const struct net_device_ops *ops = real_dev->netdev_ops;
619         int rc = -EINVAL;
620
621         if (ops->ndo_fcoe_get_wwn)
622                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
623         return rc;
624 }
625
626 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
627                                     struct scatterlist *sgl, unsigned int sgc)
628 {
629         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
630         const struct net_device_ops *ops = real_dev->netdev_ops;
631         int rc = 0;
632
633         if (ops->ndo_fcoe_ddp_target)
634                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
635
636         return rc;
637 }
638 #endif
639
640 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
641 {
642         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
643
644         if (change & IFF_ALLMULTI)
645                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
646         if (change & IFF_PROMISC)
647                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
648 }
649
650 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
651 {
652         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
653         dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
654 }
655
656 /*
657  * vlan network devices have devices nesting below it, and are a special
658  * "super class" of normal network devices; split their locks off into a
659  * separate class since they always nest.
660  */
661 static struct lock_class_key vlan_netdev_xmit_lock_key;
662 static struct lock_class_key vlan_netdev_addr_lock_key;
663
664 static void vlan_dev_set_lockdep_one(struct net_device *dev,
665                                      struct netdev_queue *txq,
666                                      void *_subclass)
667 {
668         lockdep_set_class_and_subclass(&txq->_xmit_lock,
669                                        &vlan_netdev_xmit_lock_key,
670                                        *(int *)_subclass);
671 }
672
673 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
674 {
675         lockdep_set_class_and_subclass(&dev->addr_list_lock,
676                                        &vlan_netdev_addr_lock_key,
677                                        subclass);
678         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
679 }
680
681 static const struct header_ops vlan_header_ops = {
682         .create  = vlan_dev_hard_header,
683         .rebuild = vlan_dev_rebuild_header,
684         .parse   = eth_header_parse,
685 };
686
687 static const struct net_device_ops vlan_netdev_ops;
688
689 static int vlan_dev_init(struct net_device *dev)
690 {
691         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
692         int subclass = 0;
693
694         netif_carrier_off(dev);
695
696         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
697         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
698                                           IFF_MASTER | IFF_SLAVE);
699         dev->iflink = real_dev->ifindex;
700         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
701                                           (1<<__LINK_STATE_DORMANT))) |
702                       (1<<__LINK_STATE_PRESENT);
703
704         dev->features |= real_dev->features & real_dev->vlan_features;
705         dev->features |= NETIF_F_LLTX;
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         dev->needed_headroom = real_dev->needed_headroom;
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         } else {
725                 dev->header_ops      = &vlan_header_ops;
726                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
727         }
728
729         dev->netdev_ops = &vlan_netdev_ops;
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_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
737         if (!vlan_dev_info(dev)->vlan_pcpu_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_pcpu_stats);
750         vlan->vlan_pcpu_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 rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
787 {
788
789         if (vlan_dev_info(dev)->vlan_pcpu_stats) {
790                 struct vlan_pcpu_stats *p;
791                 u32 rx_errors = 0, tx_dropped = 0;
792                 int i;
793
794                 for_each_possible_cpu(i) {
795                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
796                         unsigned int start;
797
798                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i);
799                         do {
800                                 start = u64_stats_fetch_begin_bh(&p->syncp);
801                                 rxpackets       = p->rx_packets;
802                                 rxbytes         = p->rx_bytes;
803                                 rxmulticast     = p->rx_multicast;
804                                 txpackets       = p->tx_packets;
805                                 txbytes         = p->tx_bytes;
806                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
807
808                         stats->rx_packets       += rxpackets;
809                         stats->rx_bytes         += rxbytes;
810                         stats->multicast        += rxmulticast;
811                         stats->tx_packets       += txpackets;
812                         stats->tx_bytes         += txbytes;
813                         /* rx_errors & tx_dropped are u32 */
814                         rx_errors       += p->rx_errors;
815                         tx_dropped      += p->tx_dropped;
816                 }
817                 stats->rx_errors  = rx_errors;
818                 stats->tx_dropped = tx_dropped;
819         }
820         return stats;
821 }
822
823 static int vlan_ethtool_set_tso(struct net_device *dev, u32 data)
824 {
825        if (data) {
826                 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
827
828                 /* Underlying device must support TSO for VLAN-tagged packets
829                  * and must have TSO enabled now.
830                  */
831                 if (!(real_dev->vlan_features & NETIF_F_TSO))
832                         return -EOPNOTSUPP;
833                 if (!(real_dev->features & NETIF_F_TSO))
834                         return -EINVAL;
835                 dev->features |= NETIF_F_TSO;
836         } else {
837                 dev->features &= ~NETIF_F_TSO;
838         }
839         return 0;
840 }
841
842 static const struct ethtool_ops vlan_ethtool_ops = {
843         .get_settings           = vlan_ethtool_get_settings,
844         .get_drvinfo            = vlan_ethtool_get_drvinfo,
845         .get_link               = ethtool_op_get_link,
846         .get_rx_csum            = vlan_ethtool_get_rx_csum,
847         .get_flags              = vlan_ethtool_get_flags,
848         .set_tso                = vlan_ethtool_set_tso,
849 };
850
851 static const struct net_device_ops vlan_netdev_ops = {
852         .ndo_change_mtu         = vlan_dev_change_mtu,
853         .ndo_init               = vlan_dev_init,
854         .ndo_uninit             = vlan_dev_uninit,
855         .ndo_open               = vlan_dev_open,
856         .ndo_stop               = vlan_dev_stop,
857         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
858         .ndo_validate_addr      = eth_validate_addr,
859         .ndo_set_mac_address    = vlan_dev_set_mac_address,
860         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
861         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
862         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
863         .ndo_do_ioctl           = vlan_dev_ioctl,
864         .ndo_neigh_setup        = vlan_dev_neigh_setup,
865         .ndo_get_stats64        = vlan_dev_get_stats64,
866 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
867         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
868         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
869         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
870         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
871         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
872         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
873 #endif
874 };
875
876 void vlan_setup(struct net_device *dev)
877 {
878         ether_setup(dev);
879
880         dev->priv_flags         |= IFF_802_1Q_VLAN;
881         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
882         dev->tx_queue_len       = 0;
883
884         dev->netdev_ops         = &vlan_netdev_ops;
885         dev->destructor         = free_netdev;
886         dev->ethtool_ops        = &vlan_ethtool_ops;
887
888         memset(dev->broadcast, 0, ETH_ALEN);
889 }