Version:  2.0.40 2.2.26 2.4.37 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 3.16

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_rcu(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_rcu(upper_dev,
 85                                                     vlan_proto, vlan_id);
 86         }
 87 
 88         return NULL;
 89 }
 90 EXPORT_SYMBOL(__vlan_find_dev_deep_rcu);
 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                 kfree_skb(skb);
119                 return NULL;
120         }
121 
122         memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
123         skb->mac_header += VLAN_HLEN;
124         return skb;
125 }
126 
127 struct sk_buff *vlan_untag(struct sk_buff *skb)
128 {
129         struct vlan_hdr *vhdr;
130         u16 vlan_tci;
131 
132         if (unlikely(vlan_tx_tag_present(skb))) {
133                 /* vlan_tci is already set-up so leave this for another time */
134                 return skb;
135         }
136 
137         skb = skb_share_check(skb, GFP_ATOMIC);
138         if (unlikely(!skb))
139                 goto err_free;
140 
141         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
142                 goto err_free;
143 
144         vhdr = (struct vlan_hdr *) skb->data;
145         vlan_tci = ntohs(vhdr->h_vlan_TCI);
146         __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci);
147 
148         skb_pull_rcsum(skb, VLAN_HLEN);
149         vlan_set_encap_proto(skb, vhdr);
150 
151         skb = vlan_reorder_header(skb);
152         if (unlikely(!skb))
153                 goto err_free;
154 
155         skb_reset_network_header(skb);
156         skb_reset_transport_header(skb);
157         skb_reset_mac_len(skb);
158 
159         return skb;
160 
161 err_free:
162         kfree_skb(skb);
163         return NULL;
164 }
165 EXPORT_SYMBOL(vlan_untag);
166 
167 
168 /*
169  * vlan info and vid list
170  */
171 
172 static void vlan_group_free(struct vlan_group *grp)
173 {
174         int i, j;
175 
176         for (i = 0; i < VLAN_PROTO_NUM; i++)
177                 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
178                         kfree(grp->vlan_devices_arrays[i][j]);
179 }
180 
181 static void vlan_info_free(struct vlan_info *vlan_info)
182 {
183         vlan_group_free(&vlan_info->grp);
184         kfree(vlan_info);
185 }
186 
187 static void vlan_info_rcu_free(struct rcu_head *rcu)
188 {
189         vlan_info_free(container_of(rcu, struct vlan_info, rcu));
190 }
191 
192 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
193 {
194         struct vlan_info *vlan_info;
195 
196         vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
197         if (!vlan_info)
198                 return NULL;
199 
200         vlan_info->real_dev = dev;
201         INIT_LIST_HEAD(&vlan_info->vid_list);
202         return vlan_info;
203 }
204 
205 struct vlan_vid_info {
206         struct list_head list;
207         __be16 proto;
208         u16 vid;
209         int refcount;
210 };
211 
212 static bool vlan_hw_filter_capable(const struct net_device *dev,
213                                      const struct vlan_vid_info *vid_info)
214 {
215         if (vid_info->proto == htons(ETH_P_8021Q) &&
216             dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
217                 return true;
218         if (vid_info->proto == htons(ETH_P_8021AD) &&
219             dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
220                 return true;
221         return false;
222 }
223 
224 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
225                                                __be16 proto, u16 vid)
226 {
227         struct vlan_vid_info *vid_info;
228 
229         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
230                 if (vid_info->proto == proto && vid_info->vid == vid)
231                         return vid_info;
232         }
233         return NULL;
234 }
235 
236 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
237 {
238         struct vlan_vid_info *vid_info;
239 
240         vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
241         if (!vid_info)
242                 return NULL;
243         vid_info->proto = proto;
244         vid_info->vid = vid;
245 
246         return vid_info;
247 }
248 
249 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
250                           struct vlan_vid_info **pvid_info)
251 {
252         struct net_device *dev = vlan_info->real_dev;
253         const struct net_device_ops *ops = dev->netdev_ops;
254         struct vlan_vid_info *vid_info;
255         int err;
256 
257         vid_info = vlan_vid_info_alloc(proto, vid);
258         if (!vid_info)
259                 return -ENOMEM;
260 
261         if (vlan_hw_filter_capable(dev, vid_info)) {
262                 err =  ops->ndo_vlan_rx_add_vid(dev, proto, vid);
263                 if (err) {
264                         kfree(vid_info);
265                         return err;
266                 }
267         }
268         list_add(&vid_info->list, &vlan_info->vid_list);
269         vlan_info->nr_vids++;
270         *pvid_info = vid_info;
271         return 0;
272 }
273 
274 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
275 {
276         struct vlan_info *vlan_info;
277         struct vlan_vid_info *vid_info;
278         bool vlan_info_created = false;
279         int err;
280 
281         ASSERT_RTNL();
282 
283         vlan_info = rtnl_dereference(dev->vlan_info);
284         if (!vlan_info) {
285                 vlan_info = vlan_info_alloc(dev);
286                 if (!vlan_info)
287                         return -ENOMEM;
288                 vlan_info_created = true;
289         }
290         vid_info = vlan_vid_info_get(vlan_info, proto, vid);
291         if (!vid_info) {
292                 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
293                 if (err)
294                         goto out_free_vlan_info;
295         }
296         vid_info->refcount++;
297 
298         if (vlan_info_created)
299                 rcu_assign_pointer(dev->vlan_info, vlan_info);
300 
301         return 0;
302 
303 out_free_vlan_info:
304         if (vlan_info_created)
305                 kfree(vlan_info);
306         return err;
307 }
308 EXPORT_SYMBOL(vlan_vid_add);
309 
310 static void __vlan_vid_del(struct vlan_info *vlan_info,
311                            struct vlan_vid_info *vid_info)
312 {
313         struct net_device *dev = vlan_info->real_dev;
314         const struct net_device_ops *ops = dev->netdev_ops;
315         __be16 proto = vid_info->proto;
316         u16 vid = vid_info->vid;
317         int err;
318 
319         if (vlan_hw_filter_capable(dev, vid_info)) {
320                 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
321                 if (err) {
322                         pr_warn("failed to kill vid %04x/%d for device %s\n",
323                                 proto, vid, dev->name);
324                 }
325         }
326         list_del(&vid_info->list);
327         kfree(vid_info);
328         vlan_info->nr_vids--;
329 }
330 
331 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
332 {
333         struct vlan_info *vlan_info;
334         struct vlan_vid_info *vid_info;
335 
336         ASSERT_RTNL();
337 
338         vlan_info = rtnl_dereference(dev->vlan_info);
339         if (!vlan_info)
340                 return;
341 
342         vid_info = vlan_vid_info_get(vlan_info, proto, vid);
343         if (!vid_info)
344                 return;
345         vid_info->refcount--;
346         if (vid_info->refcount == 0) {
347                 __vlan_vid_del(vlan_info, vid_info);
348                 if (vlan_info->nr_vids == 0) {
349                         RCU_INIT_POINTER(dev->vlan_info, NULL);
350                         call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
351                 }
352         }
353 }
354 EXPORT_SYMBOL(vlan_vid_del);
355 
356 int vlan_vids_add_by_dev(struct net_device *dev,
357                          const struct net_device *by_dev)
358 {
359         struct vlan_vid_info *vid_info;
360         struct vlan_info *vlan_info;
361         int err;
362 
363         ASSERT_RTNL();
364 
365         vlan_info = rtnl_dereference(by_dev->vlan_info);
366         if (!vlan_info)
367                 return 0;
368 
369         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
370                 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
371                 if (err)
372                         goto unwind;
373         }
374         return 0;
375 
376 unwind:
377         list_for_each_entry_continue_reverse(vid_info,
378                                              &vlan_info->vid_list,
379                                              list) {
380                 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
381         }
382 
383         return err;
384 }
385 EXPORT_SYMBOL(vlan_vids_add_by_dev);
386 
387 void vlan_vids_del_by_dev(struct net_device *dev,
388                           const struct net_device *by_dev)
389 {
390         struct vlan_vid_info *vid_info;
391         struct vlan_info *vlan_info;
392 
393         ASSERT_RTNL();
394 
395         vlan_info = rtnl_dereference(by_dev->vlan_info);
396         if (!vlan_info)
397                 return;
398 
399         list_for_each_entry(vid_info, &vlan_info->vid_list, list)
400                 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
401 }
402 EXPORT_SYMBOL(vlan_vids_del_by_dev);
403 
404 bool vlan_uses_dev(const struct net_device *dev)
405 {
406         struct vlan_info *vlan_info;
407 
408         ASSERT_RTNL();
409 
410         vlan_info = rtnl_dereference(dev->vlan_info);
411         if (!vlan_info)
412                 return false;
413         return vlan_info->grp.nr_vlan_devs ? true : false;
414 }
415 EXPORT_SYMBOL(vlan_uses_dev);
416 

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