Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/net/8021q/vlan_core.c

  1 #include <linux/skbuff.h>
  2 #include <linux/netdevice.h>
  3 #include <linux/if_vlan.h>
  4 #include <linux/netpoll.h>
  5 #include <linux/export.h>
  6 #include "vlan.h"
  7 
  8 bool vlan_do_receive(struct sk_buff **skbp)
  9 {
 10         struct sk_buff *skb = *skbp;
 11         __be16 vlan_proto = skb->vlan_proto;
 12         u16 vlan_id = vlan_tx_tag_get_id(skb);
 13         struct net_device *vlan_dev;
 14         struct vlan_pcpu_stats *rx_stats;
 15 
 16         vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id);
 17         if (!vlan_dev)
 18                 return false;
 19 
 20         skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
 21         if (unlikely(!skb))
 22                 return false;
 23 
 24         skb->dev = vlan_dev;
 25         if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
 26                 /* Our lower layer thinks this is not local, let's make sure.
 27                  * This allows the VLAN to have a different MAC than the
 28                  * underlying device, and still route correctly. */
 29                 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
 30                         skb->pkt_type = PACKET_HOST;
 31         }
 32 
 33         if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 34                 unsigned int offset = skb->data - skb_mac_header(skb);
 35 
 36                 /*
 37                  * vlan_insert_tag expect skb->data pointing to mac header.
 38                  * So change skb->data before calling it and change back to
 39                  * original position later
 40                  */
 41                 skb_push(skb, offset);
 42                 skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto,
 43                                               skb->vlan_tci);
 44                 if (!skb)
 45                         return false;
 46                 skb_pull(skb, offset + VLAN_HLEN);
 47                 skb_reset_mac_len(skb);
 48         }
 49 
 50         skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
 51         skb->vlan_tci = 0;
 52 
 53         rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
 54 
 55         u64_stats_update_begin(&rx_stats->syncp);
 56         rx_stats->rx_packets++;
 57         rx_stats->rx_bytes += skb->len;
 58         if (skb->pkt_type == PACKET_MULTICAST)
 59                 rx_stats->rx_multicast++;
 60         u64_stats_update_end(&rx_stats->syncp);
 61 
 62         return true;
 63 }
 64 
 65 /* Must be invoked with rcu_read_lock. */
 66 struct net_device *__vlan_find_dev_deep(struct net_device *dev,
 67                                         __be16 vlan_proto, u16 vlan_id)
 68 {
 69         struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
 70 
 71         if (vlan_info) {
 72                 return vlan_group_get_device(&vlan_info->grp,
 73                                              vlan_proto, vlan_id);
 74         } else {
 75                 /*
 76                  * Lower devices of master uppers (bonding, team) do not have
 77                  * grp assigned to themselves. Grp is assigned to upper device
 78                  * instead.
 79                  */
 80                 struct net_device *upper_dev;
 81 
 82                 upper_dev = netdev_master_upper_dev_get_rcu(dev);
 83                 if (upper_dev)
 84                         return __vlan_find_dev_deep(upper_dev,
 85                                                     vlan_proto, vlan_id);
 86         }
 87 
 88         return NULL;
 89 }
 90 EXPORT_SYMBOL(__vlan_find_dev_deep);
 91 
 92 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
 93 {
 94         struct net_device *ret = vlan_dev_priv(dev)->real_dev;
 95 
 96         while (is_vlan_dev(ret))
 97                 ret = vlan_dev_priv(ret)->real_dev;
 98 
 99         return ret;
100 }
101 EXPORT_SYMBOL(vlan_dev_real_dev);
102 
103 u16 vlan_dev_vlan_id(const struct net_device *dev)
104 {
105         return vlan_dev_priv(dev)->vlan_id;
106 }
107 EXPORT_SYMBOL(vlan_dev_vlan_id);
108 
109 __be16 vlan_dev_vlan_proto(const struct net_device *dev)
110 {
111         return vlan_dev_priv(dev)->vlan_proto;
112 }
113 EXPORT_SYMBOL(vlan_dev_vlan_proto);
114 
115 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
116 {
117         if (skb_cow(skb, skb_headroom(skb)) < 0)
118                 return NULL;
119         memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
120         skb->mac_header += VLAN_HLEN;
121         return skb;
122 }
123 
124 struct sk_buff *vlan_untag(struct sk_buff *skb)
125 {
126         struct vlan_hdr *vhdr;
127         u16 vlan_tci;
128 
129         if (unlikely(vlan_tx_tag_present(skb))) {
130                 /* vlan_tci is already set-up so leave this for another time */
131                 return skb;
132         }
133 
134         skb = skb_share_check(skb, GFP_ATOMIC);
135         if (unlikely(!skb))
136                 goto err_free;
137 
138         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
139                 goto err_free;
140 
141         vhdr = (struct vlan_hdr *) skb->data;
142         vlan_tci = ntohs(vhdr->h_vlan_TCI);
143         __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci);
144 
145         skb_pull_rcsum(skb, VLAN_HLEN);
146         vlan_set_encap_proto(skb, vhdr);
147 
148         skb = vlan_reorder_header(skb);
149         if (unlikely(!skb))
150                 goto err_free;
151 
152         skb_reset_network_header(skb);
153         skb_reset_transport_header(skb);
154         skb_reset_mac_len(skb);
155 
156         return skb;
157 
158 err_free:
159         kfree_skb(skb);
160         return NULL;
161 }
162 EXPORT_SYMBOL(vlan_untag);
163 
164 
165 /*
166  * vlan info and vid list
167  */
168 
169 static void vlan_group_free(struct vlan_group *grp)
170 {
171         int i, j;
172 
173         for (i = 0; i < VLAN_PROTO_NUM; i++)
174                 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
175                         kfree(grp->vlan_devices_arrays[i][j]);
176 }
177 
178 static void vlan_info_free(struct vlan_info *vlan_info)
179 {
180         vlan_group_free(&vlan_info->grp);
181         kfree(vlan_info);
182 }
183 
184 static void vlan_info_rcu_free(struct rcu_head *rcu)
185 {
186         vlan_info_free(container_of(rcu, struct vlan_info, rcu));
187 }
188 
189 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
190 {
191         struct vlan_info *vlan_info;
192 
193         vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
194         if (!vlan_info)
195                 return NULL;
196 
197         vlan_info->real_dev = dev;
198         INIT_LIST_HEAD(&vlan_info->vid_list);
199         return vlan_info;
200 }
201 
202 struct vlan_vid_info {
203         struct list_head list;
204         __be16 proto;
205         u16 vid;
206         int refcount;
207 };
208 
209 static bool vlan_hw_filter_capable(const struct net_device *dev,
210                                      const struct vlan_vid_info *vid_info)
211 {
212         if (vid_info->proto == htons(ETH_P_8021Q) &&
213             dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
214                 return true;
215         if (vid_info->proto == htons(ETH_P_8021AD) &&
216             dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
217                 return true;
218         return false;
219 }
220 
221 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
222                                                __be16 proto, u16 vid)
223 {
224         struct vlan_vid_info *vid_info;
225 
226         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
227                 if (vid_info->proto == proto && vid_info->vid == vid)
228                         return vid_info;
229         }
230         return NULL;
231 }
232 
233 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
234 {
235         struct vlan_vid_info *vid_info;
236 
237         vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
238         if (!vid_info)
239                 return NULL;
240         vid_info->proto = proto;
241         vid_info->vid = vid;
242 
243         return vid_info;
244 }
245 
246 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
247                           struct vlan_vid_info **pvid_info)
248 {
249         struct net_device *dev = vlan_info->real_dev;
250         const struct net_device_ops *ops = dev->netdev_ops;
251         struct vlan_vid_info *vid_info;
252         int err;
253 
254         vid_info = vlan_vid_info_alloc(proto, vid);
255         if (!vid_info)
256                 return -ENOMEM;
257 
258         if (vlan_hw_filter_capable(dev, vid_info)) {
259                 err =  ops->ndo_vlan_rx_add_vid(dev, proto, vid);
260                 if (err) {
261                         kfree(vid_info);
262                         return err;
263                 }
264         }
265         list_add(&vid_info->list, &vlan_info->vid_list);
266         vlan_info->nr_vids++;
267         *pvid_info = vid_info;
268         return 0;
269 }
270 
271 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
272 {
273         struct vlan_info *vlan_info;
274         struct vlan_vid_info *vid_info;
275         bool vlan_info_created = false;
276         int err;
277 
278         ASSERT_RTNL();
279 
280         vlan_info = rtnl_dereference(dev->vlan_info);
281         if (!vlan_info) {
282                 vlan_info = vlan_info_alloc(dev);
283                 if (!vlan_info)
284                         return -ENOMEM;
285                 vlan_info_created = true;
286         }
287         vid_info = vlan_vid_info_get(vlan_info, proto, vid);
288         if (!vid_info) {
289                 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
290                 if (err)
291                         goto out_free_vlan_info;
292         }
293         vid_info->refcount++;
294 
295         if (vlan_info_created)
296                 rcu_assign_pointer(dev->vlan_info, vlan_info);
297 
298         return 0;
299 
300 out_free_vlan_info:
301         if (vlan_info_created)
302                 kfree(vlan_info);
303         return err;
304 }
305 EXPORT_SYMBOL(vlan_vid_add);
306 
307 static void __vlan_vid_del(struct vlan_info *vlan_info,
308                            struct vlan_vid_info *vid_info)
309 {
310         struct net_device *dev = vlan_info->real_dev;
311         const struct net_device_ops *ops = dev->netdev_ops;
312         __be16 proto = vid_info->proto;
313         u16 vid = vid_info->vid;
314         int err;
315 
316         if (vlan_hw_filter_capable(dev, vid_info)) {
317                 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
318                 if (err) {
319                         pr_warn("failed to kill vid %04x/%d for device %s\n",
320                                 proto, vid, dev->name);
321                 }
322         }
323         list_del(&vid_info->list);
324         kfree(vid_info);
325         vlan_info->nr_vids--;
326 }
327 
328 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
329 {
330         struct vlan_info *vlan_info;
331         struct vlan_vid_info *vid_info;
332 
333         ASSERT_RTNL();
334 
335         vlan_info = rtnl_dereference(dev->vlan_info);
336         if (!vlan_info)
337                 return;
338 
339         vid_info = vlan_vid_info_get(vlan_info, proto, vid);
340         if (!vid_info)
341                 return;
342         vid_info->refcount--;
343         if (vid_info->refcount == 0) {
344                 __vlan_vid_del(vlan_info, vid_info);
345                 if (vlan_info->nr_vids == 0) {
346                         RCU_INIT_POINTER(dev->vlan_info, NULL);
347                         call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
348                 }
349         }
350 }
351 EXPORT_SYMBOL(vlan_vid_del);
352 
353 int vlan_vids_add_by_dev(struct net_device *dev,
354                          const struct net_device *by_dev)
355 {
356         struct vlan_vid_info *vid_info;
357         struct vlan_info *vlan_info;
358         int err;
359 
360         ASSERT_RTNL();
361 
362         vlan_info = rtnl_dereference(by_dev->vlan_info);
363         if (!vlan_info)
364                 return 0;
365 
366         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
367                 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
368                 if (err)
369                         goto unwind;
370         }
371         return 0;
372 
373 unwind:
374         list_for_each_entry_continue_reverse(vid_info,
375                                              &vlan_info->vid_list,
376                                              list) {
377                 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
378         }
379 
380         return err;
381 }
382 EXPORT_SYMBOL(vlan_vids_add_by_dev);
383 
384 void vlan_vids_del_by_dev(struct net_device *dev,
385                           const struct net_device *by_dev)
386 {
387         struct vlan_vid_info *vid_info;
388         struct vlan_info *vlan_info;
389 
390         ASSERT_RTNL();
391 
392         vlan_info = rtnl_dereference(by_dev->vlan_info);
393         if (!vlan_info)
394                 return;
395 
396         list_for_each_entry(vid_info, &vlan_info->vid_list, list)
397                 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
398 }
399 EXPORT_SYMBOL(vlan_vids_del_by_dev);
400 
401 bool vlan_uses_dev(const struct net_device *dev)
402 {
403         struct vlan_info *vlan_info;
404 
405         ASSERT_RTNL();
406 
407         vlan_info = rtnl_dereference(dev->vlan_info);
408         if (!vlan_info)
409                 return false;
410         return vlan_info->grp.nr_vlan_devs ? true : false;
411 }
412 EXPORT_SYMBOL(vlan_uses_dev);
413 

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