Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

Linux/net/8021q/vlan.c

  1 /*
  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:
 10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
 11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
 12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
 13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
 14  *
 15  *              This program is free software; you can redistribute it and/or
 16  *              modify it under the terms of the GNU General Public License
 17  *              as published by the Free Software Foundation; either version
 18  *              2 of the License, or (at your option) any later version.
 19  */
 20 
 21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 22 
 23 #include <linux/capability.h>
 24 #include <linux/module.h>
 25 #include <linux/netdevice.h>
 26 #include <linux/skbuff.h>
 27 #include <linux/slab.h>
 28 #include <linux/init.h>
 29 #include <linux/rculist.h>
 30 #include <net/p8022.h>
 31 #include <net/arp.h>
 32 #include <linux/rtnetlink.h>
 33 #include <linux/notifier.h>
 34 #include <net/rtnetlink.h>
 35 #include <net/net_namespace.h>
 36 #include <net/netns/generic.h>
 37 #include <asm/uaccess.h>
 38 
 39 #include <linux/if_vlan.h>
 40 #include "vlan.h"
 41 #include "vlanproc.h"
 42 
 43 #define DRV_VERSION "1.8"
 44 
 45 /* Global VLAN variables */
 46 
 47 int vlan_net_id __read_mostly;
 48 
 49 const char vlan_fullname[] = "802.1Q VLAN Support";
 50 const char vlan_version[] = DRV_VERSION;
 51 
 52 /* End of global variables definitions. */
 53 
 54 static int vlan_group_prealloc_vid(struct vlan_group *vg,
 55                                    __be16 vlan_proto, u16 vlan_id)
 56 {
 57         struct net_device **array;
 58         unsigned int pidx, vidx;
 59         unsigned int size;
 60 
 61         ASSERT_RTNL();
 62 
 63         pidx  = vlan_proto_idx(vlan_proto);
 64         vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
 65         array = vg->vlan_devices_arrays[pidx][vidx];
 66         if (array != NULL)
 67                 return 0;
 68 
 69         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 70         array = kzalloc(size, GFP_KERNEL);
 71         if (array == NULL)
 72                 return -ENOBUFS;
 73 
 74         vg->vlan_devices_arrays[pidx][vidx] = array;
 75         return 0;
 76 }
 77 
 78 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 79 {
 80         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 81         struct net_device *real_dev = vlan->real_dev;
 82         struct vlan_info *vlan_info;
 83         struct vlan_group *grp;
 84         u16 vlan_id = vlan->vlan_id;
 85 
 86         ASSERT_RTNL();
 87 
 88         vlan_info = rtnl_dereference(real_dev->vlan_info);
 89         BUG_ON(!vlan_info);
 90 
 91         grp = &vlan_info->grp;
 92 
 93         grp->nr_vlan_devs--;
 94 
 95         if (vlan->flags & VLAN_FLAG_MVRP)
 96                 vlan_mvrp_request_leave(dev);
 97         if (vlan->flags & VLAN_FLAG_GVRP)
 98                 vlan_gvrp_request_leave(dev);
 99 
100         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
101 
102         netdev_upper_dev_unlink(real_dev, dev);
103         /* Because unregister_netdevice_queue() makes sure at least one rcu
104          * grace period is respected before device freeing,
105          * we dont need to call synchronize_net() here.
106          */
107         unregister_netdevice_queue(dev, head);
108 
109         if (grp->nr_vlan_devs == 0) {
110                 vlan_mvrp_uninit_applicant(real_dev);
111                 vlan_gvrp_uninit_applicant(real_dev);
112         }
113 
114         /* Take it out of our own structures, but be sure to interlock with
115          * HW accelerating devices or SW vlan input packet processing if
116          * VLAN is not 0 (leave it there for 802.1p).
117          */
118         if (vlan_id)
119                 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
120 
121         /* Get rid of the vlan's reference to real_dev */
122         dev_put(real_dev);
123 }
124 
125 int vlan_check_real_dev(struct net_device *real_dev,
126                         __be16 protocol, u16 vlan_id)
127 {
128         const char *name = real_dev->name;
129 
130         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
131                 pr_info("VLANs not supported on %s\n", name);
132                 return -EOPNOTSUPP;
133         }
134 
135         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL)
136                 return -EEXIST;
137 
138         return 0;
139 }
140 
141 int register_vlan_dev(struct net_device *dev)
142 {
143         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
144         struct net_device *real_dev = vlan->real_dev;
145         u16 vlan_id = vlan->vlan_id;
146         struct vlan_info *vlan_info;
147         struct vlan_group *grp;
148         int err;
149 
150         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
151         if (err)
152                 return err;
153 
154         vlan_info = rtnl_dereference(real_dev->vlan_info);
155         /* vlan_info should be there now. vlan_vid_add took care of it */
156         BUG_ON(!vlan_info);
157 
158         grp = &vlan_info->grp;
159         if (grp->nr_vlan_devs == 0) {
160                 err = vlan_gvrp_init_applicant(real_dev);
161                 if (err < 0)
162                         goto out_vid_del;
163                 err = vlan_mvrp_init_applicant(real_dev);
164                 if (err < 0)
165                         goto out_uninit_gvrp;
166         }
167 
168         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
169         if (err < 0)
170                 goto out_uninit_mvrp;
171 
172         vlan->nest_level = dev_get_nest_level(real_dev, is_vlan_dev) + 1;
173         err = register_netdevice(dev);
174         if (err < 0)
175                 goto out_uninit_mvrp;
176 
177         err = netdev_upper_dev_link(real_dev, dev);
178         if (err)
179                 goto out_unregister_netdev;
180 
181         /* Account for reference in struct vlan_dev_priv */
182         dev_hold(real_dev);
183 
184         netif_stacked_transfer_operstate(real_dev, dev);
185         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
186 
187         /* So, got the sucker initialized, now lets place
188          * it into our local structure.
189          */
190         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
191         grp->nr_vlan_devs++;
192 
193         return 0;
194 
195 out_unregister_netdev:
196         unregister_netdevice(dev);
197 out_uninit_mvrp:
198         if (grp->nr_vlan_devs == 0)
199                 vlan_mvrp_uninit_applicant(real_dev);
200 out_uninit_gvrp:
201         if (grp->nr_vlan_devs == 0)
202                 vlan_gvrp_uninit_applicant(real_dev);
203 out_vid_del:
204         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
205         return err;
206 }
207 
208 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
209  *  Returns 0 if the device was created or a negative error code otherwise.
210  */
211 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
212 {
213         struct net_device *new_dev;
214         struct vlan_dev_priv *vlan;
215         struct net *net = dev_net(real_dev);
216         struct vlan_net *vn = net_generic(net, vlan_net_id);
217         char name[IFNAMSIZ];
218         int err;
219 
220         if (vlan_id >= VLAN_VID_MASK)
221                 return -ERANGE;
222 
223         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id);
224         if (err < 0)
225                 return err;
226 
227         /* Gotta set up the fields for the device. */
228         switch (vn->name_type) {
229         case VLAN_NAME_TYPE_RAW_PLUS_VID:
230                 /* name will look like:  eth1.0005 */
231                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
232                 break;
233         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
234                 /* Put our vlan.VID in the name.
235                  * Name will look like:  vlan5
236                  */
237                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
238                 break;
239         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
240                 /* Put our vlan.VID in the name.
241                  * Name will look like:  eth0.5
242                  */
243                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
244                 break;
245         case VLAN_NAME_TYPE_PLUS_VID:
246                 /* Put our vlan.VID in the name.
247                  * Name will look like:  vlan0005
248                  */
249         default:
250                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
251         }
252 
253         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
254                                NET_NAME_UNKNOWN, vlan_setup);
255 
256         if (new_dev == NULL)
257                 return -ENOBUFS;
258 
259         dev_net_set(new_dev, net);
260         /* need 4 bytes for extra VLAN header info,
261          * hope the underlying device can handle it.
262          */
263         new_dev->mtu = real_dev->mtu;
264 
265         vlan = vlan_dev_priv(new_dev);
266         vlan->vlan_proto = htons(ETH_P_8021Q);
267         vlan->vlan_id = vlan_id;
268         vlan->real_dev = real_dev;
269         vlan->dent = NULL;
270         vlan->flags = VLAN_FLAG_REORDER_HDR;
271 
272         new_dev->rtnl_link_ops = &vlan_link_ops;
273         err = register_vlan_dev(new_dev);
274         if (err < 0)
275                 goto out_free_newdev;
276 
277         return 0;
278 
279 out_free_newdev:
280         free_netdev(new_dev);
281         return err;
282 }
283 
284 static void vlan_sync_address(struct net_device *dev,
285                               struct net_device *vlandev)
286 {
287         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
288 
289         /* May be called without an actual change */
290         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
291                 return;
292 
293         /* vlan continues to inherit address of lower device */
294         if (vlan_dev_inherit_address(vlandev, dev))
295                 goto out;
296 
297         /* vlan address was different from the old address and is equal to
298          * the new address */
299         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
300             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
301                 dev_uc_del(dev, vlandev->dev_addr);
302 
303         /* vlan address was equal to the old address and is different from
304          * the new address */
305         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
306             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
307                 dev_uc_add(dev, vlandev->dev_addr);
308 
309 out:
310         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
311 }
312 
313 static void vlan_transfer_features(struct net_device *dev,
314                                    struct net_device *vlandev)
315 {
316         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
317 
318         vlandev->gso_max_size = dev->gso_max_size;
319         vlandev->gso_max_segs = dev->gso_max_segs;
320 
321         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
322                 vlandev->hard_header_len = dev->hard_header_len;
323         else
324                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
325 
326 #if IS_ENABLED(CONFIG_FCOE)
327         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
328 #endif
329 
330         netdev_update_features(vlandev);
331 }
332 
333 static int __vlan_device_event(struct net_device *dev, unsigned long event)
334 {
335         int err = 0;
336 
337         switch (event) {
338         case NETDEV_CHANGENAME:
339                 vlan_proc_rem_dev(dev);
340                 err = vlan_proc_add_dev(dev);
341                 break;
342         case NETDEV_REGISTER:
343                 err = vlan_proc_add_dev(dev);
344                 break;
345         case NETDEV_UNREGISTER:
346                 vlan_proc_rem_dev(dev);
347                 break;
348         }
349 
350         return err;
351 }
352 
353 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
354                              void *ptr)
355 {
356         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
357         struct vlan_group *grp;
358         struct vlan_info *vlan_info;
359         int i, flgs;
360         struct net_device *vlandev;
361         struct vlan_dev_priv *vlan;
362         bool last = false;
363         LIST_HEAD(list);
364 
365         if (is_vlan_dev(dev)) {
366                 int err = __vlan_device_event(dev, event);
367 
368                 if (err)
369                         return notifier_from_errno(err);
370         }
371 
372         if ((event == NETDEV_UP) &&
373             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
374                 pr_info("adding VLAN 0 to HW filter on device %s\n",
375                         dev->name);
376                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
377         }
378 
379         vlan_info = rtnl_dereference(dev->vlan_info);
380         if (!vlan_info)
381                 goto out;
382         grp = &vlan_info->grp;
383 
384         /* It is OK that we do not hold the group lock right now,
385          * as we run under the RTNL lock.
386          */
387 
388         switch (event) {
389         case NETDEV_CHANGE:
390                 /* Propagate real device state to vlan devices */
391                 vlan_group_for_each_dev(grp, i, vlandev)
392                         netif_stacked_transfer_operstate(dev, vlandev);
393                 break;
394 
395         case NETDEV_CHANGEADDR:
396                 /* Adjust unicast filters on underlying device */
397                 vlan_group_for_each_dev(grp, i, vlandev) {
398                         flgs = vlandev->flags;
399                         if (!(flgs & IFF_UP))
400                                 continue;
401 
402                         vlan_sync_address(dev, vlandev);
403                 }
404                 break;
405 
406         case NETDEV_CHANGEMTU:
407                 vlan_group_for_each_dev(grp, i, vlandev) {
408                         if (vlandev->mtu <= dev->mtu)
409                                 continue;
410 
411                         dev_set_mtu(vlandev, dev->mtu);
412                 }
413                 break;
414 
415         case NETDEV_FEAT_CHANGE:
416                 /* Propagate device features to underlying device */
417                 vlan_group_for_each_dev(grp, i, vlandev)
418                         vlan_transfer_features(dev, vlandev);
419                 break;
420 
421         case NETDEV_DOWN: {
422                 struct net_device *tmp;
423                 LIST_HEAD(close_list);
424 
425                 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
426                         vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
427 
428                 /* Put all VLANs for this dev in the down state too.  */
429                 vlan_group_for_each_dev(grp, i, vlandev) {
430                         flgs = vlandev->flags;
431                         if (!(flgs & IFF_UP))
432                                 continue;
433 
434                         vlan = vlan_dev_priv(vlandev);
435                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
436                                 list_add(&vlandev->close_list, &close_list);
437                 }
438 
439                 dev_close_many(&close_list, false);
440 
441                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
442                         netif_stacked_transfer_operstate(dev, vlandev);
443                         list_del_init(&vlandev->close_list);
444                 }
445                 list_del(&close_list);
446                 break;
447         }
448         case NETDEV_UP:
449                 /* Put all VLANs for this dev in the up state too.  */
450                 vlan_group_for_each_dev(grp, i, vlandev) {
451                         flgs = dev_get_flags(vlandev);
452                         if (flgs & IFF_UP)
453                                 continue;
454 
455                         vlan = vlan_dev_priv(vlandev);
456                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
457                                 dev_change_flags(vlandev, flgs | IFF_UP);
458                         netif_stacked_transfer_operstate(dev, vlandev);
459                 }
460                 break;
461 
462         case NETDEV_UNREGISTER:
463                 /* twiddle thumbs on netns device moves */
464                 if (dev->reg_state != NETREG_UNREGISTERING)
465                         break;
466 
467                 vlan_group_for_each_dev(grp, i, vlandev) {
468                         /* removal of last vid destroys vlan_info, abort
469                          * afterwards */
470                         if (vlan_info->nr_vids == 1)
471                                 last = true;
472 
473                         unregister_vlan_dev(vlandev, &list);
474                         if (last)
475                                 break;
476                 }
477                 unregister_netdevice_many(&list);
478                 break;
479 
480         case NETDEV_PRE_TYPE_CHANGE:
481                 /* Forbid underlaying device to change its type. */
482                 if (vlan_uses_dev(dev))
483                         return NOTIFY_BAD;
484                 break;
485 
486         case NETDEV_NOTIFY_PEERS:
487         case NETDEV_BONDING_FAILOVER:
488         case NETDEV_RESEND_IGMP:
489                 /* Propagate to vlan devices */
490                 vlan_group_for_each_dev(grp, i, vlandev)
491                         call_netdevice_notifiers(event, vlandev);
492                 break;
493         }
494 
495 out:
496         return NOTIFY_DONE;
497 }
498 
499 static struct notifier_block vlan_notifier_block __read_mostly = {
500         .notifier_call = vlan_device_event,
501 };
502 
503 /*
504  *      VLAN IOCTL handler.
505  *      o execute requested action or pass command to the device driver
506  *   arg is really a struct vlan_ioctl_args __user *.
507  */
508 static int vlan_ioctl_handler(struct net *net, void __user *arg)
509 {
510         int err;
511         struct vlan_ioctl_args args;
512         struct net_device *dev = NULL;
513 
514         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
515                 return -EFAULT;
516 
517         /* Null terminate this sucker, just in case. */
518         args.device1[23] = 0;
519         args.u.device2[23] = 0;
520 
521         rtnl_lock();
522 
523         switch (args.cmd) {
524         case SET_VLAN_INGRESS_PRIORITY_CMD:
525         case SET_VLAN_EGRESS_PRIORITY_CMD:
526         case SET_VLAN_FLAG_CMD:
527         case ADD_VLAN_CMD:
528         case DEL_VLAN_CMD:
529         case GET_VLAN_REALDEV_NAME_CMD:
530         case GET_VLAN_VID_CMD:
531                 err = -ENODEV;
532                 dev = __dev_get_by_name(net, args.device1);
533                 if (!dev)
534                         goto out;
535 
536                 err = -EINVAL;
537                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
538                         goto out;
539         }
540 
541         switch (args.cmd) {
542         case SET_VLAN_INGRESS_PRIORITY_CMD:
543                 err = -EPERM;
544                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
545                         break;
546                 vlan_dev_set_ingress_priority(dev,
547                                               args.u.skb_priority,
548                                               args.vlan_qos);
549                 err = 0;
550                 break;
551 
552         case SET_VLAN_EGRESS_PRIORITY_CMD:
553                 err = -EPERM;
554                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
555                         break;
556                 err = vlan_dev_set_egress_priority(dev,
557                                                    args.u.skb_priority,
558                                                    args.vlan_qos);
559                 break;
560 
561         case SET_VLAN_FLAG_CMD:
562                 err = -EPERM;
563                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
564                         break;
565                 err = vlan_dev_change_flags(dev,
566                                             args.vlan_qos ? args.u.flag : 0,
567                                             args.u.flag);
568                 break;
569 
570         case SET_VLAN_NAME_TYPE_CMD:
571                 err = -EPERM;
572                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
573                         break;
574                 if ((args.u.name_type >= 0) &&
575                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
576                         struct vlan_net *vn;
577 
578                         vn = net_generic(net, vlan_net_id);
579                         vn->name_type = args.u.name_type;
580                         err = 0;
581                 } else {
582                         err = -EINVAL;
583                 }
584                 break;
585 
586         case ADD_VLAN_CMD:
587                 err = -EPERM;
588                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
589                         break;
590                 err = register_vlan_device(dev, args.u.VID);
591                 break;
592 
593         case DEL_VLAN_CMD:
594                 err = -EPERM;
595                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
596                         break;
597                 unregister_vlan_dev(dev, NULL);
598                 err = 0;
599                 break;
600 
601         case GET_VLAN_REALDEV_NAME_CMD:
602                 err = 0;
603                 vlan_dev_get_realdev_name(dev, args.u.device2);
604                 if (copy_to_user(arg, &args,
605                                  sizeof(struct vlan_ioctl_args)))
606                         err = -EFAULT;
607                 break;
608 
609         case GET_VLAN_VID_CMD:
610                 err = 0;
611                 args.u.VID = vlan_dev_vlan_id(dev);
612                 if (copy_to_user(arg, &args,
613                                  sizeof(struct vlan_ioctl_args)))
614                       err = -EFAULT;
615                 break;
616 
617         default:
618                 err = -EOPNOTSUPP;
619                 break;
620         }
621 out:
622         rtnl_unlock();
623         return err;
624 }
625 
626 static struct sk_buff **vlan_gro_receive(struct sk_buff **head,
627                                          struct sk_buff *skb)
628 {
629         struct sk_buff *p, **pp = NULL;
630         struct vlan_hdr *vhdr;
631         unsigned int hlen, off_vlan;
632         const struct packet_offload *ptype;
633         __be16 type;
634         int flush = 1;
635 
636         off_vlan = skb_gro_offset(skb);
637         hlen = off_vlan + sizeof(*vhdr);
638         vhdr = skb_gro_header_fast(skb, off_vlan);
639         if (skb_gro_header_hard(skb, hlen)) {
640                 vhdr = skb_gro_header_slow(skb, hlen, off_vlan);
641                 if (unlikely(!vhdr))
642                         goto out;
643         }
644 
645         type = vhdr->h_vlan_encapsulated_proto;
646 
647         rcu_read_lock();
648         ptype = gro_find_receive_by_type(type);
649         if (!ptype)
650                 goto out_unlock;
651 
652         flush = 0;
653 
654         for (p = *head; p; p = p->next) {
655                 struct vlan_hdr *vhdr2;
656 
657                 if (!NAPI_GRO_CB(p)->same_flow)
658                         continue;
659 
660                 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
661                 if (compare_vlan_header(vhdr, vhdr2))
662                         NAPI_GRO_CB(p)->same_flow = 0;
663         }
664 
665         skb_gro_pull(skb, sizeof(*vhdr));
666         skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
667         pp = ptype->callbacks.gro_receive(head, skb);
668 
669 out_unlock:
670         rcu_read_unlock();
671 out:
672         NAPI_GRO_CB(skb)->flush |= flush;
673 
674         return pp;
675 }
676 
677 static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
678 {
679         struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
680         __be16 type = vhdr->h_vlan_encapsulated_proto;
681         struct packet_offload *ptype;
682         int err = -ENOENT;
683 
684         rcu_read_lock();
685         ptype = gro_find_complete_by_type(type);
686         if (ptype)
687                 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr));
688 
689         rcu_read_unlock();
690         return err;
691 }
692 
693 static struct packet_offload vlan_packet_offloads[] __read_mostly = {
694         {
695                 .type = cpu_to_be16(ETH_P_8021Q),
696                 .priority = 10,
697                 .callbacks = {
698                         .gro_receive = vlan_gro_receive,
699                         .gro_complete = vlan_gro_complete,
700                 },
701         },
702         {
703                 .type = cpu_to_be16(ETH_P_8021AD),
704                 .priority = 10,
705                 .callbacks = {
706                         .gro_receive = vlan_gro_receive,
707                         .gro_complete = vlan_gro_complete,
708                 },
709         },
710 };
711 
712 static int __net_init vlan_init_net(struct net *net)
713 {
714         struct vlan_net *vn = net_generic(net, vlan_net_id);
715         int err;
716 
717         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
718 
719         err = vlan_proc_init(net);
720 
721         return err;
722 }
723 
724 static void __net_exit vlan_exit_net(struct net *net)
725 {
726         vlan_proc_cleanup(net);
727 }
728 
729 static struct pernet_operations vlan_net_ops = {
730         .init = vlan_init_net,
731         .exit = vlan_exit_net,
732         .id   = &vlan_net_id,
733         .size = sizeof(struct vlan_net),
734 };
735 
736 static int __init vlan_proto_init(void)
737 {
738         int err;
739         unsigned int i;
740 
741         pr_info("%s v%s\n", vlan_fullname, vlan_version);
742 
743         err = register_pernet_subsys(&vlan_net_ops);
744         if (err < 0)
745                 goto err0;
746 
747         err = register_netdevice_notifier(&vlan_notifier_block);
748         if (err < 0)
749                 goto err2;
750 
751         err = vlan_gvrp_init();
752         if (err < 0)
753                 goto err3;
754 
755         err = vlan_mvrp_init();
756         if (err < 0)
757                 goto err4;
758 
759         err = vlan_netlink_init();
760         if (err < 0)
761                 goto err5;
762 
763         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
764                 dev_add_offload(&vlan_packet_offloads[i]);
765 
766         vlan_ioctl_set(vlan_ioctl_handler);
767         return 0;
768 
769 err5:
770         vlan_mvrp_uninit();
771 err4:
772         vlan_gvrp_uninit();
773 err3:
774         unregister_netdevice_notifier(&vlan_notifier_block);
775 err2:
776         unregister_pernet_subsys(&vlan_net_ops);
777 err0:
778         return err;
779 }
780 
781 static void __exit vlan_cleanup_module(void)
782 {
783         unsigned int i;
784 
785         vlan_ioctl_set(NULL);
786 
787         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
788                 dev_remove_offload(&vlan_packet_offloads[i]);
789 
790         vlan_netlink_fini();
791 
792         unregister_netdevice_notifier(&vlan_notifier_block);
793 
794         unregister_pernet_subsys(&vlan_net_ops);
795         rcu_barrier(); /* Wait for completion of call_rcu()'s */
796 
797         vlan_mvrp_uninit();
798         vlan_gvrp_uninit();
799 }
800 
801 module_init(vlan_proto_init);
802 module_exit(vlan_cleanup_module);
803 
804 MODULE_LICENSE("GPL");
805 MODULE_VERSION(DRV_VERSION);
806 

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