Version:  2.0.40 2.2.26 2.4.37 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 3.17 3.18

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 /*
116  * vlan info and vid list
117  */
118 
119 static void vlan_group_free(struct vlan_group *grp)
120 {
121         int i, j;
122 
123         for (i = 0; i < VLAN_PROTO_NUM; i++)
124                 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
125                         kfree(grp->vlan_devices_arrays[i][j]);
126 }
127 
128 static void vlan_info_free(struct vlan_info *vlan_info)
129 {
130         vlan_group_free(&vlan_info->grp);
131         kfree(vlan_info);
132 }
133 
134 static void vlan_info_rcu_free(struct rcu_head *rcu)
135 {
136         vlan_info_free(container_of(rcu, struct vlan_info, rcu));
137 }
138 
139 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
140 {
141         struct vlan_info *vlan_info;
142 
143         vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
144         if (!vlan_info)
145                 return NULL;
146 
147         vlan_info->real_dev = dev;
148         INIT_LIST_HEAD(&vlan_info->vid_list);
149         return vlan_info;
150 }
151 
152 struct vlan_vid_info {
153         struct list_head list;
154         __be16 proto;
155         u16 vid;
156         int refcount;
157 };
158 
159 static bool vlan_hw_filter_capable(const struct net_device *dev,
160                                      const struct vlan_vid_info *vid_info)
161 {
162         if (vid_info->proto == htons(ETH_P_8021Q) &&
163             dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
164                 return true;
165         if (vid_info->proto == htons(ETH_P_8021AD) &&
166             dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
167                 return true;
168         return false;
169 }
170 
171 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
172                                                __be16 proto, u16 vid)
173 {
174         struct vlan_vid_info *vid_info;
175 
176         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
177                 if (vid_info->proto == proto && vid_info->vid == vid)
178                         return vid_info;
179         }
180         return NULL;
181 }
182 
183 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
184 {
185         struct vlan_vid_info *vid_info;
186 
187         vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
188         if (!vid_info)
189                 return NULL;
190         vid_info->proto = proto;
191         vid_info->vid = vid;
192 
193         return vid_info;
194 }
195 
196 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
197                           struct vlan_vid_info **pvid_info)
198 {
199         struct net_device *dev = vlan_info->real_dev;
200         const struct net_device_ops *ops = dev->netdev_ops;
201         struct vlan_vid_info *vid_info;
202         int err;
203 
204         vid_info = vlan_vid_info_alloc(proto, vid);
205         if (!vid_info)
206                 return -ENOMEM;
207 
208         if (vlan_hw_filter_capable(dev, vid_info)) {
209                 err =  ops->ndo_vlan_rx_add_vid(dev, proto, vid);
210                 if (err) {
211                         kfree(vid_info);
212                         return err;
213                 }
214         }
215         list_add(&vid_info->list, &vlan_info->vid_list);
216         vlan_info->nr_vids++;
217         *pvid_info = vid_info;
218         return 0;
219 }
220 
221 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
222 {
223         struct vlan_info *vlan_info;
224         struct vlan_vid_info *vid_info;
225         bool vlan_info_created = false;
226         int err;
227 
228         ASSERT_RTNL();
229 
230         vlan_info = rtnl_dereference(dev->vlan_info);
231         if (!vlan_info) {
232                 vlan_info = vlan_info_alloc(dev);
233                 if (!vlan_info)
234                         return -ENOMEM;
235                 vlan_info_created = true;
236         }
237         vid_info = vlan_vid_info_get(vlan_info, proto, vid);
238         if (!vid_info) {
239                 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
240                 if (err)
241                         goto out_free_vlan_info;
242         }
243         vid_info->refcount++;
244 
245         if (vlan_info_created)
246                 rcu_assign_pointer(dev->vlan_info, vlan_info);
247 
248         return 0;
249 
250 out_free_vlan_info:
251         if (vlan_info_created)
252                 kfree(vlan_info);
253         return err;
254 }
255 EXPORT_SYMBOL(vlan_vid_add);
256 
257 static void __vlan_vid_del(struct vlan_info *vlan_info,
258                            struct vlan_vid_info *vid_info)
259 {
260         struct net_device *dev = vlan_info->real_dev;
261         const struct net_device_ops *ops = dev->netdev_ops;
262         __be16 proto = vid_info->proto;
263         u16 vid = vid_info->vid;
264         int err;
265 
266         if (vlan_hw_filter_capable(dev, vid_info)) {
267                 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
268                 if (err) {
269                         pr_warn("failed to kill vid %04x/%d for device %s\n",
270                                 proto, vid, dev->name);
271                 }
272         }
273         list_del(&vid_info->list);
274         kfree(vid_info);
275         vlan_info->nr_vids--;
276 }
277 
278 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
279 {
280         struct vlan_info *vlan_info;
281         struct vlan_vid_info *vid_info;
282 
283         ASSERT_RTNL();
284 
285         vlan_info = rtnl_dereference(dev->vlan_info);
286         if (!vlan_info)
287                 return;
288 
289         vid_info = vlan_vid_info_get(vlan_info, proto, vid);
290         if (!vid_info)
291                 return;
292         vid_info->refcount--;
293         if (vid_info->refcount == 0) {
294                 __vlan_vid_del(vlan_info, vid_info);
295                 if (vlan_info->nr_vids == 0) {
296                         RCU_INIT_POINTER(dev->vlan_info, NULL);
297                         call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
298                 }
299         }
300 }
301 EXPORT_SYMBOL(vlan_vid_del);
302 
303 int vlan_vids_add_by_dev(struct net_device *dev,
304                          const struct net_device *by_dev)
305 {
306         struct vlan_vid_info *vid_info;
307         struct vlan_info *vlan_info;
308         int err;
309 
310         ASSERT_RTNL();
311 
312         vlan_info = rtnl_dereference(by_dev->vlan_info);
313         if (!vlan_info)
314                 return 0;
315 
316         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
317                 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
318                 if (err)
319                         goto unwind;
320         }
321         return 0;
322 
323 unwind:
324         list_for_each_entry_continue_reverse(vid_info,
325                                              &vlan_info->vid_list,
326                                              list) {
327                 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
328         }
329 
330         return err;
331 }
332 EXPORT_SYMBOL(vlan_vids_add_by_dev);
333 
334 void vlan_vids_del_by_dev(struct net_device *dev,
335                           const struct net_device *by_dev)
336 {
337         struct vlan_vid_info *vid_info;
338         struct vlan_info *vlan_info;
339 
340         ASSERT_RTNL();
341 
342         vlan_info = rtnl_dereference(by_dev->vlan_info);
343         if (!vlan_info)
344                 return;
345 
346         list_for_each_entry(vid_info, &vlan_info->vid_list, list)
347                 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
348 }
349 EXPORT_SYMBOL(vlan_vids_del_by_dev);
350 
351 bool vlan_uses_dev(const struct net_device *dev)
352 {
353         struct vlan_info *vlan_info;
354 
355         ASSERT_RTNL();
356 
357         vlan_info = rtnl_dereference(dev->vlan_info);
358         if (!vlan_info)
359                 return false;
360         return vlan_info->grp.nr_vlan_devs ? true : false;
361 }
362 EXPORT_SYMBOL(vlan_uses_dev);
363 

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