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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; |
d4b812de | 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; |
375f67df | 25 | if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) { |
0b5c9db1 JP |
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. */ | |
be14cc98 | 29 | if (ether_addr_equal_64bits(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 | { | |
0369722f | 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; | |
22d1ba74 | 100 | } |
116cb428 | 101 | EXPORT_SYMBOL(vlan_dev_real_dev); |
22d1ba74 PM |
102 | |
103 | u16 vlan_dev_vlan_id(const struct net_device *dev) | |
104 | { | |
7da82c06 | 105 | return vlan_dev_priv(dev)->vlan_id; |
22d1ba74 | 106 | } |
116cb428 | 107 | EXPORT_SYMBOL(vlan_dev_vlan_id); |
e1c096e2 | 108 | |
71e415e4 | 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 | ||
0b5c9db1 | 115 | static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) |
bcc6d479 | 116 | { |
0b5c9db1 JP |
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; | |
bcc6d479 JP |
121 | return skb; |
122 | } | |
123 | ||
bcc6d479 JP |
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); | |
86a9bad3 | 143 | __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci); |
bcc6d479 JP |
144 | |
145 | skb_pull_rcsum(skb, VLAN_HLEN); | |
146 | vlan_set_encap_proto(skb, vhdr); | |
147 | ||
0b5c9db1 | 148 | skb = vlan_reorder_header(skb); |
bcc6d479 JP |
149 | if (unlikely(!skb)) |
150 | goto err_free; | |
151 | ||
c5114cd5 JP |
152 | skb_reset_network_header(skb); |
153 | skb_reset_transport_header(skb); | |
5316cf9a AQ |
154 | skb_reset_mac_len(skb); |
155 | ||
bcc6d479 JP |
156 | return skb; |
157 | ||
158 | err_free: | |
159 | kfree_skb(skb); | |
160 | return NULL; | |
161 | } | |
78851988 | 162 | EXPORT_SYMBOL(vlan_untag); |
87002b03 | 163 | |
5b9ea6e0 JP |
164 | |
165 | /* | |
166 | * vlan info and vid list | |
167 | */ | |
168 | ||
169 | static void vlan_group_free(struct vlan_group *grp) | |
170 | { | |
cf2c014a | 171 | int i, j; |
5b9ea6e0 | 172 | |
cf2c014a PM |
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]); | |
5b9ea6e0 JP |
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; | |
80d5c368 PM |
204 | __be16 proto; |
205 | u16 vid; | |
5b9ea6e0 JP |
206 | int refcount; |
207 | }; | |
208 | ||
8ad227ff PM |
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 | ||
5b9ea6e0 | 221 | static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, |
80d5c368 | 222 | __be16 proto, u16 vid) |
5b9ea6e0 JP |
223 | { |
224 | struct vlan_vid_info *vid_info; | |
225 | ||
226 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { | |
80d5c368 | 227 | if (vid_info->proto == proto && vid_info->vid == vid) |
5b9ea6e0 JP |
228 | return vid_info; |
229 | } | |
230 | return NULL; | |
231 | } | |
232 | ||
80d5c368 | 233 | static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) |
5b9ea6e0 JP |
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; | |
80d5c368 | 240 | vid_info->proto = proto; |
5b9ea6e0 JP |
241 | vid_info->vid = vid; |
242 | ||
243 | return vid_info; | |
244 | } | |
245 | ||
80d5c368 | 246 | static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, |
5b9ea6e0 | 247 | struct vlan_vid_info **pvid_info) |
87002b03 | 248 | { |
5b9ea6e0 | 249 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 250 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
251 | struct vlan_vid_info *vid_info; |
252 | int err; | |
253 | ||
80d5c368 | 254 | vid_info = vlan_vid_info_alloc(proto, vid); |
5b9ea6e0 JP |
255 | if (!vid_info) |
256 | return -ENOMEM; | |
87002b03 | 257 | |
8ad227ff | 258 | if (vlan_hw_filter_capable(dev, vid_info)) { |
80d5c368 | 259 | err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); |
5b9ea6e0 JP |
260 | if (err) { |
261 | kfree(vid_info); | |
262 | return err; | |
263 | } | |
87002b03 | 264 | } |
5b9ea6e0 JP |
265 | list_add(&vid_info->list, &vlan_info->vid_list); |
266 | vlan_info->nr_vids++; | |
267 | *pvid_info = vid_info; | |
87002b03 JP |
268 | return 0; |
269 | } | |
5b9ea6e0 | 270 | |
80d5c368 | 271 | int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
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 | } | |
80d5c368 | 287 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 | 288 | if (!vid_info) { |
80d5c368 | 289 | err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); |
5b9ea6e0 JP |
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 | } | |
87002b03 JP |
305 | EXPORT_SYMBOL(vlan_vid_add); |
306 | ||
5b9ea6e0 JP |
307 | static void __vlan_vid_del(struct vlan_info *vlan_info, |
308 | struct vlan_vid_info *vid_info) | |
87002b03 | 309 | { |
5b9ea6e0 | 310 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 311 | const struct net_device_ops *ops = dev->netdev_ops; |
80d5c368 PM |
312 | __be16 proto = vid_info->proto; |
313 | u16 vid = vid_info->vid; | |
5b9ea6e0 | 314 | int err; |
87002b03 | 315 | |
8ad227ff | 316 | if (vlan_hw_filter_capable(dev, vid_info)) { |
80d5c368 | 317 | err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); |
5b9ea6e0 | 318 | if (err) { |
80d5c368 PM |
319 | pr_warn("failed to kill vid %04x/%d for device %s\n", |
320 | proto, vid, dev->name); | |
5b9ea6e0 JP |
321 | } |
322 | } | |
323 | list_del(&vid_info->list); | |
324 | kfree(vid_info); | |
325 | vlan_info->nr_vids--; | |
326 | } | |
327 | ||
80d5c368 | 328 | void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
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 | ||
80d5c368 | 339 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 JP |
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 | } | |
87002b03 JP |
349 | } |
350 | } | |
351 | EXPORT_SYMBOL(vlan_vid_del); | |
348a1443 JP |
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; | |
f9586f79 | 357 | struct vlan_info *vlan_info; |
348a1443 JP |
358 | int err; |
359 | ||
360 | ASSERT_RTNL(); | |
361 | ||
f9586f79 DC |
362 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
363 | if (!vlan_info) | |
348a1443 JP |
364 | return 0; |
365 | ||
f9586f79 | 366 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
80d5c368 | 367 | err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
368 | if (err) |
369 | goto unwind; | |
370 | } | |
371 | return 0; | |
372 | ||
373 | unwind: | |
374 | list_for_each_entry_continue_reverse(vid_info, | |
f9586f79 | 375 | &vlan_info->vid_list, |
348a1443 | 376 | list) { |
80d5c368 | 377 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
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; | |
f9586f79 | 388 | struct vlan_info *vlan_info; |
348a1443 JP |
389 | |
390 | ASSERT_RTNL(); | |
391 | ||
f9586f79 DC |
392 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
393 | if (!vlan_info) | |
348a1443 JP |
394 | return; |
395 | ||
f9586f79 | 396 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) |
80d5c368 | 397 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
398 | } |
399 | EXPORT_SYMBOL(vlan_vids_del_by_dev); | |
9b361c13 JP |
400 | |
401 | bool vlan_uses_dev(const struct net_device *dev) | |
402 | { | |
55462cf3 JP |
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; | |
9b361c13 JP |
411 | } |
412 | EXPORT_SYMBOL(vlan_uses_dev); |