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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 (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(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 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
110 {
111         if (skb_cow(skb, skb_headroom(skb)) < 0)
112                 return NULL;
113         memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
114         skb->mac_header += VLAN_HLEN;
115         return skb;
116 }
117 
118 struct sk_buff *vlan_untag(struct sk_buff *skb)
119 {
120         struct vlan_hdr *vhdr;
121         u16 vlan_tci;
122 
123         if (unlikely(vlan_tx_tag_present(skb))) {
124                 /* vlan_tci is already set-up so leave this for another time */
125                 return skb;
126         }
127 
128         skb = skb_share_check(skb, GFP_ATOMIC);
129         if (unlikely(!skb))
130                 goto err_free;
131 
132         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
133                 goto err_free;
134 
135         vhdr = (struct vlan_hdr *) skb->data;
136         vlan_tci = ntohs(vhdr->h_vlan_TCI);
137         __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci);
138 
139         skb_pull_rcsum(skb, VLAN_HLEN);
140         vlan_set_encap_proto(skb, vhdr);
141 
142         skb = vlan_reorder_header(skb);
143         if (unlikely(!skb))
144                 goto err_free;
145 
146         skb_reset_network_header(skb);
147         skb_reset_transport_header(skb);
148         skb_reset_mac_len(skb);
149 
150         return skb;
151 
152 err_free:
153         kfree_skb(skb);
154         return NULL;
155 }
156 EXPORT_SYMBOL(vlan_untag);
157 
158 
159 /*
160  * vlan info and vid list
161  */
162 
163 static void vlan_group_free(struct vlan_group *grp)
164 {
165         int i, j;
166 
167         for (i = 0; i < VLAN_PROTO_NUM; i++)
168                 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
169                         kfree(grp->vlan_devices_arrays[i][j]);
170 }
171 
172 static void vlan_info_free(struct vlan_info *vlan_info)
173 {
174         vlan_group_free(&vlan_info->grp);
175         kfree(vlan_info);
176 }
177 
178 static void vlan_info_rcu_free(struct rcu_head *rcu)
179 {
180         vlan_info_free(container_of(rcu, struct vlan_info, rcu));
181 }
182 
183 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
184 {
185         struct vlan_info *vlan_info;
186 
187         vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
188         if (!vlan_info)
189                 return NULL;
190 
191         vlan_info->real_dev = dev;
192         INIT_LIST_HEAD(&vlan_info->vid_list);
193         return vlan_info;
194 }
195 
196 struct vlan_vid_info {
197         struct list_head list;
198         __be16 proto;
199         u16 vid;
200         int refcount;
201 };
202 
203 static bool vlan_hw_filter_capable(const struct net_device *dev,
204                                      const struct vlan_vid_info *vid_info)
205 {
206         if (vid_info->proto == htons(ETH_P_8021Q) &&
207             dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
208                 return true;
209         if (vid_info->proto == htons(ETH_P_8021AD) &&
210             dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
211                 return true;
212         return false;
213 }
214 
215 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
216                                                __be16 proto, u16 vid)
217 {
218         struct vlan_vid_info *vid_info;
219 
220         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
221                 if (vid_info->proto == proto && vid_info->vid == vid)
222                         return vid_info;
223         }
224         return NULL;
225 }
226 
227 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
228 {
229         struct vlan_vid_info *vid_info;
230 
231         vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
232         if (!vid_info)
233                 return NULL;
234         vid_info->proto = proto;
235         vid_info->vid = vid;
236 
237         return vid_info;
238 }
239 
240 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
241                           struct vlan_vid_info **pvid_info)
242 {
243         struct net_device *dev = vlan_info->real_dev;
244         const struct net_device_ops *ops = dev->netdev_ops;
245         struct vlan_vid_info *vid_info;
246         int err;
247 
248         vid_info = vlan_vid_info_alloc(proto, vid);
249         if (!vid_info)
250                 return -ENOMEM;
251 
252         if (vlan_hw_filter_capable(dev, vid_info)) {
253                 err =  ops->ndo_vlan_rx_add_vid(dev, proto, vid);
254                 if (err) {
255                         kfree(vid_info);
256                         return err;
257                 }
258         }
259         list_add(&vid_info->list, &vlan_info->vid_list);
260         vlan_info->nr_vids++;
261         *pvid_info = vid_info;
262         return 0;
263 }
264 
265 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
266 {
267         struct vlan_info *vlan_info;
268         struct vlan_vid_info *vid_info;
269         bool vlan_info_created = false;
270         int err;
271 
272         ASSERT_RTNL();
273 
274         vlan_info = rtnl_dereference(dev->vlan_info);
275         if (!vlan_info) {
276                 vlan_info = vlan_info_alloc(dev);
277                 if (!vlan_info)
278                         return -ENOMEM;
279                 vlan_info_created = true;
280         }
281         vid_info = vlan_vid_info_get(vlan_info, proto, vid);
282         if (!vid_info) {
283                 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
284                 if (err)
285                         goto out_free_vlan_info;
286         }
287         vid_info->refcount++;
288 
289         if (vlan_info_created)
290                 rcu_assign_pointer(dev->vlan_info, vlan_info);
291 
292         return 0;
293 
294 out_free_vlan_info:
295         if (vlan_info_created)
296                 kfree(vlan_info);
297         return err;
298 }
299 EXPORT_SYMBOL(vlan_vid_add);
300 
301 static void __vlan_vid_del(struct vlan_info *vlan_info,
302                            struct vlan_vid_info *vid_info)
303 {
304         struct net_device *dev = vlan_info->real_dev;
305         const struct net_device_ops *ops = dev->netdev_ops;
306         __be16 proto = vid_info->proto;
307         u16 vid = vid_info->vid;
308         int err;
309 
310         if (vlan_hw_filter_capable(dev, vid_info)) {
311                 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
312                 if (err) {
313                         pr_warn("failed to kill vid %04x/%d for device %s\n",
314                                 proto, vid, dev->name);
315                 }
316         }
317         list_del(&vid_info->list);
318         kfree(vid_info);
319         vlan_info->nr_vids--;
320 }
321 
322 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
323 {
324         struct vlan_info *vlan_info;
325         struct vlan_vid_info *vid_info;
326 
327         ASSERT_RTNL();
328 
329         vlan_info = rtnl_dereference(dev->vlan_info);
330         if (!vlan_info)
331                 return;
332 
333         vid_info = vlan_vid_info_get(vlan_info, proto, vid);
334         if (!vid_info)
335                 return;
336         vid_info->refcount--;
337         if (vid_info->refcount == 0) {
338                 __vlan_vid_del(vlan_info, vid_info);
339                 if (vlan_info->nr_vids == 0) {
340                         RCU_INIT_POINTER(dev->vlan_info, NULL);
341                         call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
342                 }
343         }
344 }
345 EXPORT_SYMBOL(vlan_vid_del);
346 
347 int vlan_vids_add_by_dev(struct net_device *dev,
348                          const struct net_device *by_dev)
349 {
350         struct vlan_vid_info *vid_info;
351         struct vlan_info *vlan_info;
352         int err;
353 
354         ASSERT_RTNL();
355 
356         vlan_info = rtnl_dereference(by_dev->vlan_info);
357         if (!vlan_info)
358                 return 0;
359 
360         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
361                 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
362                 if (err)
363                         goto unwind;
364         }
365         return 0;
366 
367 unwind:
368         list_for_each_entry_continue_reverse(vid_info,
369                                              &vlan_info->vid_list,
370                                              list) {
371                 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
372         }
373 
374         return err;
375 }
376 EXPORT_SYMBOL(vlan_vids_add_by_dev);
377 
378 void vlan_vids_del_by_dev(struct net_device *dev,
379                           const struct net_device *by_dev)
380 {
381         struct vlan_vid_info *vid_info;
382         struct vlan_info *vlan_info;
383 
384         ASSERT_RTNL();
385 
386         vlan_info = rtnl_dereference(by_dev->vlan_info);
387         if (!vlan_info)
388                 return;
389 
390         list_for_each_entry(vid_info, &vlan_info->vid_list, list)
391                 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
392 }
393 EXPORT_SYMBOL(vlan_vids_del_by_dev);
394 
395 bool vlan_uses_dev(const struct net_device *dev)
396 {
397         struct vlan_info *vlan_info;
398 
399         ASSERT_RTNL();
400 
401         vlan_info = rtnl_dereference(dev->vlan_info);
402         if (!vlan_info)
403                 return false;
404         return vlan_info->grp.nr_vlan_devs ? true : false;
405 }
406 EXPORT_SYMBOL(vlan_uses_dev);
407 

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