Commit | Line | Data |
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7750f403 PM |
1 | #include <linux/skbuff.h> |
2 | #include <linux/netdevice.h> | |
3 | #include <linux/if_vlan.h> | |
4ead4431 | 4 | #include <linux/netpoll.h> |
bc3b2d7f | 5 | #include <linux/export.h> |
7750f403 PM |
6 | #include "vlan.h" |
7 | ||
48cc32d3 | 8 | bool vlan_do_receive(struct sk_buff **skbp) |
7750f403 | 9 | { |
3701e513 | 10 | struct sk_buff *skb = *skbp; |
86a9bad3 | 11 | __be16 vlan_proto = skb->vlan_proto; |
37b25f3f | 12 | u16 vlan_id = vlan_tx_tag_get_id(skb); |
ad1afb00 | 13 | struct net_device *vlan_dev; |
4af429d2 | 14 | struct vlan_pcpu_stats *rx_stats; |
7750f403 | 15 | |
86a9bad3 | 16 | vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id); |
48cc32d3 | 17 | if (!vlan_dev) |
3701e513 | 18 | return false; |
9b22ea56 | 19 | |
3701e513 JG |
20 | skb = *skbp = skb_share_check(skb, GFP_ATOMIC); |
21 | if (unlikely(!skb)) | |
22 | return false; | |
e1c096e2 | 23 | |
3701e513 | 24 | skb->dev = vlan_dev; |
0b5c9db1 JP |
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. */ | |
53a2b3a1 | 29 | if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr)) |
0b5c9db1 JP |
30 | skb->pkt_type = PACKET_HOST; |
31 | } | |
32 | ||
7da82c06 | 33 | if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) { |
0b5c9db1 JP |
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); | |
86a9bad3 PM |
42 | skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto, |
43 | skb->vlan_tci); | |
0b5c9db1 JP |
44 | if (!skb) |
45 | return false; | |
46 | skb_pull(skb, offset + VLAN_HLEN); | |
47 | skb_reset_mac_len(skb); | |
48 | } | |
49 | ||
3701e513 | 50 | skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); |
bc1d0411 | 51 | skb->vlan_tci = 0; |
7750f403 | 52 | |
7da82c06 | 53 | rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); |
9793241f | 54 | |
9618e2ff | 55 | u64_stats_update_begin(&rx_stats->syncp); |
9793241f ED |
56 | rx_stats->rx_packets++; |
57 | rx_stats->rx_bytes += skb->len; | |
0b5c9db1 | 58 | if (skb->pkt_type == PACKET_MULTICAST) |
9618e2ff | 59 | rx_stats->rx_multicast++; |
9618e2ff | 60 | u64_stats_update_end(&rx_stats->syncp); |
3701e513 JG |
61 | |
62 | return true; | |
7750f403 | 63 | } |
22d1ba74 | 64 | |
1cdfd72f JP |
65 | /* Must be invoked with rcu_read_lock. */ |
66 | struct net_device *__vlan_find_dev_deep(struct net_device *dev, | |
1fd9b1fc | 67 | __be16 vlan_proto, u16 vlan_id) |
cec9c133 | 68 | { |
1cdfd72f | 69 | struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info); |
cec9c133 | 70 | |
5b9ea6e0 | 71 | if (vlan_info) { |
1fd9b1fc PM |
72 | return vlan_group_get_device(&vlan_info->grp, |
73 | vlan_proto, vlan_id); | |
cec9c133 JP |
74 | } else { |
75 | /* | |
1cdfd72f JP |
76 | * Lower devices of master uppers (bonding, team) do not have |
77 | * grp assigned to themselves. Grp is assigned to upper device | |
78 | * instead. | |
cec9c133 | 79 | */ |
1cdfd72f JP |
80 | struct net_device *upper_dev; |
81 | ||
82 | upper_dev = netdev_master_upper_dev_get_rcu(dev); | |
83 | if (upper_dev) | |
1fd9b1fc PM |
84 | return __vlan_find_dev_deep(upper_dev, |
85 | vlan_proto, vlan_id); | |
cec9c133 JP |
86 | } |
87 | ||
88 | return NULL; | |
89 | } | |
90 | EXPORT_SYMBOL(__vlan_find_dev_deep); | |
91 | ||
22d1ba74 PM |
92 | struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
93 | { | |
7da82c06 | 94 | return vlan_dev_priv(dev)->real_dev; |
22d1ba74 | 95 | } |
116cb428 | 96 | EXPORT_SYMBOL(vlan_dev_real_dev); |
22d1ba74 PM |
97 | |
98 | u16 vlan_dev_vlan_id(const struct net_device *dev) | |
99 | { | |
7da82c06 | 100 | return vlan_dev_priv(dev)->vlan_id; |
22d1ba74 | 101 | } |
116cb428 | 102 | EXPORT_SYMBOL(vlan_dev_vlan_id); |
e1c096e2 | 103 | |
0b5c9db1 | 104 | static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) |
bcc6d479 | 105 | { |
1b56220b LR |
106 | if (skb_cow(skb, skb_headroom(skb)) < 0) { |
107 | kfree_skb(skb); | |
0b5c9db1 | 108 | return NULL; |
1b56220b LR |
109 | } |
110 | ||
0b5c9db1 JP |
111 | memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); |
112 | skb->mac_header += VLAN_HLEN; | |
bcc6d479 JP |
113 | return skb; |
114 | } | |
115 | ||
bcc6d479 JP |
116 | struct sk_buff *vlan_untag(struct sk_buff *skb) |
117 | { | |
118 | struct vlan_hdr *vhdr; | |
119 | u16 vlan_tci; | |
120 | ||
121 | if (unlikely(vlan_tx_tag_present(skb))) { | |
122 | /* vlan_tci is already set-up so leave this for another time */ | |
123 | return skb; | |
124 | } | |
125 | ||
126 | skb = skb_share_check(skb, GFP_ATOMIC); | |
127 | if (unlikely(!skb)) | |
128 | goto err_free; | |
129 | ||
130 | if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) | |
131 | goto err_free; | |
132 | ||
133 | vhdr = (struct vlan_hdr *) skb->data; | |
134 | vlan_tci = ntohs(vhdr->h_vlan_TCI); | |
86a9bad3 | 135 | __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci); |
bcc6d479 JP |
136 | |
137 | skb_pull_rcsum(skb, VLAN_HLEN); | |
138 | vlan_set_encap_proto(skb, vhdr); | |
139 | ||
0b5c9db1 | 140 | skb = vlan_reorder_header(skb); |
bcc6d479 JP |
141 | if (unlikely(!skb)) |
142 | goto err_free; | |
143 | ||
c5114cd5 JP |
144 | skb_reset_network_header(skb); |
145 | skb_reset_transport_header(skb); | |
5316cf9a AQ |
146 | skb_reset_mac_len(skb); |
147 | ||
bcc6d479 JP |
148 | return skb; |
149 | ||
150 | err_free: | |
151 | kfree_skb(skb); | |
152 | return NULL; | |
153 | } | |
78851988 | 154 | EXPORT_SYMBOL(vlan_untag); |
87002b03 | 155 | |
5b9ea6e0 JP |
156 | |
157 | /* | |
158 | * vlan info and vid list | |
159 | */ | |
160 | ||
161 | static void vlan_group_free(struct vlan_group *grp) | |
162 | { | |
cf2c014a | 163 | int i, j; |
5b9ea6e0 | 164 | |
cf2c014a PM |
165 | for (i = 0; i < VLAN_PROTO_NUM; i++) |
166 | for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) | |
167 | kfree(grp->vlan_devices_arrays[i][j]); | |
5b9ea6e0 JP |
168 | } |
169 | ||
170 | static void vlan_info_free(struct vlan_info *vlan_info) | |
171 | { | |
172 | vlan_group_free(&vlan_info->grp); | |
173 | kfree(vlan_info); | |
174 | } | |
175 | ||
176 | static void vlan_info_rcu_free(struct rcu_head *rcu) | |
177 | { | |
178 | vlan_info_free(container_of(rcu, struct vlan_info, rcu)); | |
179 | } | |
180 | ||
181 | static struct vlan_info *vlan_info_alloc(struct net_device *dev) | |
182 | { | |
183 | struct vlan_info *vlan_info; | |
184 | ||
185 | vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); | |
186 | if (!vlan_info) | |
187 | return NULL; | |
188 | ||
189 | vlan_info->real_dev = dev; | |
190 | INIT_LIST_HEAD(&vlan_info->vid_list); | |
191 | return vlan_info; | |
192 | } | |
193 | ||
194 | struct vlan_vid_info { | |
195 | struct list_head list; | |
80d5c368 PM |
196 | __be16 proto; |
197 | u16 vid; | |
5b9ea6e0 JP |
198 | int refcount; |
199 | }; | |
200 | ||
8ad227ff PM |
201 | static bool vlan_hw_filter_capable(const struct net_device *dev, |
202 | const struct vlan_vid_info *vid_info) | |
203 | { | |
204 | if (vid_info->proto == htons(ETH_P_8021Q) && | |
205 | dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) | |
206 | return true; | |
207 | if (vid_info->proto == htons(ETH_P_8021AD) && | |
208 | dev->features & NETIF_F_HW_VLAN_STAG_FILTER) | |
209 | return true; | |
210 | return false; | |
211 | } | |
212 | ||
5b9ea6e0 | 213 | static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, |
80d5c368 | 214 | __be16 proto, u16 vid) |
5b9ea6e0 JP |
215 | { |
216 | struct vlan_vid_info *vid_info; | |
217 | ||
218 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { | |
80d5c368 | 219 | if (vid_info->proto == proto && vid_info->vid == vid) |
5b9ea6e0 JP |
220 | return vid_info; |
221 | } | |
222 | return NULL; | |
223 | } | |
224 | ||
80d5c368 | 225 | static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) |
5b9ea6e0 JP |
226 | { |
227 | struct vlan_vid_info *vid_info; | |
228 | ||
229 | vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); | |
230 | if (!vid_info) | |
231 | return NULL; | |
80d5c368 | 232 | vid_info->proto = proto; |
5b9ea6e0 JP |
233 | vid_info->vid = vid; |
234 | ||
235 | return vid_info; | |
236 | } | |
237 | ||
80d5c368 | 238 | static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, |
5b9ea6e0 | 239 | struct vlan_vid_info **pvid_info) |
87002b03 | 240 | { |
5b9ea6e0 | 241 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 242 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
243 | struct vlan_vid_info *vid_info; |
244 | int err; | |
245 | ||
80d5c368 | 246 | vid_info = vlan_vid_info_alloc(proto, vid); |
5b9ea6e0 JP |
247 | if (!vid_info) |
248 | return -ENOMEM; | |
87002b03 | 249 | |
8ad227ff | 250 | if (vlan_hw_filter_capable(dev, vid_info)) { |
80d5c368 | 251 | err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); |
5b9ea6e0 JP |
252 | if (err) { |
253 | kfree(vid_info); | |
254 | return err; | |
255 | } | |
87002b03 | 256 | } |
5b9ea6e0 JP |
257 | list_add(&vid_info->list, &vlan_info->vid_list); |
258 | vlan_info->nr_vids++; | |
259 | *pvid_info = vid_info; | |
87002b03 JP |
260 | return 0; |
261 | } | |
5b9ea6e0 | 262 | |
80d5c368 | 263 | int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
264 | { |
265 | struct vlan_info *vlan_info; | |
266 | struct vlan_vid_info *vid_info; | |
267 | bool vlan_info_created = false; | |
268 | int err; | |
269 | ||
270 | ASSERT_RTNL(); | |
271 | ||
272 | vlan_info = rtnl_dereference(dev->vlan_info); | |
273 | if (!vlan_info) { | |
274 | vlan_info = vlan_info_alloc(dev); | |
275 | if (!vlan_info) | |
276 | return -ENOMEM; | |
277 | vlan_info_created = true; | |
278 | } | |
80d5c368 | 279 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 | 280 | if (!vid_info) { |
80d5c368 | 281 | err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); |
5b9ea6e0 JP |
282 | if (err) |
283 | goto out_free_vlan_info; | |
284 | } | |
285 | vid_info->refcount++; | |
286 | ||
287 | if (vlan_info_created) | |
288 | rcu_assign_pointer(dev->vlan_info, vlan_info); | |
289 | ||
290 | return 0; | |
291 | ||
292 | out_free_vlan_info: | |
293 | if (vlan_info_created) | |
294 | kfree(vlan_info); | |
295 | return err; | |
296 | } | |
87002b03 JP |
297 | EXPORT_SYMBOL(vlan_vid_add); |
298 | ||
5b9ea6e0 JP |
299 | static void __vlan_vid_del(struct vlan_info *vlan_info, |
300 | struct vlan_vid_info *vid_info) | |
87002b03 | 301 | { |
5b9ea6e0 | 302 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 303 | const struct net_device_ops *ops = dev->netdev_ops; |
80d5c368 PM |
304 | __be16 proto = vid_info->proto; |
305 | u16 vid = vid_info->vid; | |
5b9ea6e0 | 306 | int err; |
87002b03 | 307 | |
8ad227ff | 308 | if (vlan_hw_filter_capable(dev, vid_info)) { |
80d5c368 | 309 | err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); |
5b9ea6e0 | 310 | if (err) { |
80d5c368 PM |
311 | pr_warn("failed to kill vid %04x/%d for device %s\n", |
312 | proto, vid, dev->name); | |
5b9ea6e0 JP |
313 | } |
314 | } | |
315 | list_del(&vid_info->list); | |
316 | kfree(vid_info); | |
317 | vlan_info->nr_vids--; | |
318 | } | |
319 | ||
80d5c368 | 320 | void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
321 | { |
322 | struct vlan_info *vlan_info; | |
323 | struct vlan_vid_info *vid_info; | |
324 | ||
325 | ASSERT_RTNL(); | |
326 | ||
327 | vlan_info = rtnl_dereference(dev->vlan_info); | |
328 | if (!vlan_info) | |
329 | return; | |
330 | ||
80d5c368 | 331 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 JP |
332 | if (!vid_info) |
333 | return; | |
334 | vid_info->refcount--; | |
335 | if (vid_info->refcount == 0) { | |
336 | __vlan_vid_del(vlan_info, vid_info); | |
337 | if (vlan_info->nr_vids == 0) { | |
338 | RCU_INIT_POINTER(dev->vlan_info, NULL); | |
339 | call_rcu(&vlan_info->rcu, vlan_info_rcu_free); | |
340 | } | |
87002b03 JP |
341 | } |
342 | } | |
343 | EXPORT_SYMBOL(vlan_vid_del); | |
348a1443 JP |
344 | |
345 | int vlan_vids_add_by_dev(struct net_device *dev, | |
346 | const struct net_device *by_dev) | |
347 | { | |
348 | struct vlan_vid_info *vid_info; | |
f9586f79 | 349 | struct vlan_info *vlan_info; |
348a1443 JP |
350 | int err; |
351 | ||
352 | ASSERT_RTNL(); | |
353 | ||
f9586f79 DC |
354 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
355 | if (!vlan_info) | |
348a1443 JP |
356 | return 0; |
357 | ||
f9586f79 | 358 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
80d5c368 | 359 | err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
360 | if (err) |
361 | goto unwind; | |
362 | } | |
363 | return 0; | |
364 | ||
365 | unwind: | |
366 | list_for_each_entry_continue_reverse(vid_info, | |
f9586f79 | 367 | &vlan_info->vid_list, |
348a1443 | 368 | list) { |
80d5c368 | 369 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
370 | } |
371 | ||
372 | return err; | |
373 | } | |
374 | EXPORT_SYMBOL(vlan_vids_add_by_dev); | |
375 | ||
376 | void vlan_vids_del_by_dev(struct net_device *dev, | |
377 | const struct net_device *by_dev) | |
378 | { | |
379 | struct vlan_vid_info *vid_info; | |
f9586f79 | 380 | struct vlan_info *vlan_info; |
348a1443 JP |
381 | |
382 | ASSERT_RTNL(); | |
383 | ||
f9586f79 DC |
384 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
385 | if (!vlan_info) | |
348a1443 JP |
386 | return; |
387 | ||
f9586f79 | 388 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) |
80d5c368 | 389 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
390 | } |
391 | EXPORT_SYMBOL(vlan_vids_del_by_dev); | |
9b361c13 JP |
392 | |
393 | bool vlan_uses_dev(const struct net_device *dev) | |
394 | { | |
55462cf3 JP |
395 | struct vlan_info *vlan_info; |
396 | ||
397 | ASSERT_RTNL(); | |
398 | ||
399 | vlan_info = rtnl_dereference(dev->vlan_info); | |
400 | if (!vlan_info) | |
401 | return false; | |
402 | return vlan_info->grp.nr_vlan_devs ? true : false; | |
9b361c13 JP |
403 | } |
404 | EXPORT_SYMBOL(vlan_uses_dev); |