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; |
3701e513 | 12 | u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK; |
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 | { |
0b5c9db1 JP |
106 | if (skb_cow(skb, skb_headroom(skb)) < 0) |
107 | return NULL; | |
108 | memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); | |
109 | skb->mac_header += VLAN_HLEN; | |
bcc6d479 JP |
110 | return skb; |
111 | } | |
112 | ||
bcc6d479 JP |
113 | struct sk_buff *vlan_untag(struct sk_buff *skb) |
114 | { | |
115 | struct vlan_hdr *vhdr; | |
116 | u16 vlan_tci; | |
117 | ||
118 | if (unlikely(vlan_tx_tag_present(skb))) { | |
119 | /* vlan_tci is already set-up so leave this for another time */ | |
120 | return skb; | |
121 | } | |
122 | ||
123 | skb = skb_share_check(skb, GFP_ATOMIC); | |
124 | if (unlikely(!skb)) | |
125 | goto err_free; | |
126 | ||
127 | if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) | |
128 | goto err_free; | |
129 | ||
130 | vhdr = (struct vlan_hdr *) skb->data; | |
131 | vlan_tci = ntohs(vhdr->h_vlan_TCI); | |
86a9bad3 | 132 | __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci); |
bcc6d479 JP |
133 | |
134 | skb_pull_rcsum(skb, VLAN_HLEN); | |
135 | vlan_set_encap_proto(skb, vhdr); | |
136 | ||
0b5c9db1 | 137 | skb = vlan_reorder_header(skb); |
bcc6d479 JP |
138 | if (unlikely(!skb)) |
139 | goto err_free; | |
140 | ||
c5114cd5 JP |
141 | skb_reset_network_header(skb); |
142 | skb_reset_transport_header(skb); | |
5316cf9a AQ |
143 | skb_reset_mac_len(skb); |
144 | ||
bcc6d479 JP |
145 | return skb; |
146 | ||
147 | err_free: | |
148 | kfree_skb(skb); | |
149 | return NULL; | |
150 | } | |
78851988 | 151 | EXPORT_SYMBOL(vlan_untag); |
87002b03 | 152 | |
5b9ea6e0 JP |
153 | |
154 | /* | |
155 | * vlan info and vid list | |
156 | */ | |
157 | ||
158 | static void vlan_group_free(struct vlan_group *grp) | |
159 | { | |
160 | int i; | |
161 | ||
162 | for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) | |
163 | kfree(grp->vlan_devices_arrays[i]); | |
164 | } | |
165 | ||
166 | static void vlan_info_free(struct vlan_info *vlan_info) | |
167 | { | |
168 | vlan_group_free(&vlan_info->grp); | |
169 | kfree(vlan_info); | |
170 | } | |
171 | ||
172 | static void vlan_info_rcu_free(struct rcu_head *rcu) | |
173 | { | |
174 | vlan_info_free(container_of(rcu, struct vlan_info, rcu)); | |
175 | } | |
176 | ||
177 | static struct vlan_info *vlan_info_alloc(struct net_device *dev) | |
178 | { | |
179 | struct vlan_info *vlan_info; | |
180 | ||
181 | vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); | |
182 | if (!vlan_info) | |
183 | return NULL; | |
184 | ||
185 | vlan_info->real_dev = dev; | |
186 | INIT_LIST_HEAD(&vlan_info->vid_list); | |
187 | return vlan_info; | |
188 | } | |
189 | ||
190 | struct vlan_vid_info { | |
191 | struct list_head list; | |
80d5c368 PM |
192 | __be16 proto; |
193 | u16 vid; | |
5b9ea6e0 JP |
194 | int refcount; |
195 | }; | |
196 | ||
197 | static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, | |
80d5c368 | 198 | __be16 proto, u16 vid) |
5b9ea6e0 JP |
199 | { |
200 | struct vlan_vid_info *vid_info; | |
201 | ||
202 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { | |
80d5c368 | 203 | if (vid_info->proto == proto && vid_info->vid == vid) |
5b9ea6e0 JP |
204 | return vid_info; |
205 | } | |
206 | return NULL; | |
207 | } | |
208 | ||
80d5c368 | 209 | static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) |
5b9ea6e0 JP |
210 | { |
211 | struct vlan_vid_info *vid_info; | |
212 | ||
213 | vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); | |
214 | if (!vid_info) | |
215 | return NULL; | |
80d5c368 | 216 | vid_info->proto = proto; |
5b9ea6e0 JP |
217 | vid_info->vid = vid; |
218 | ||
219 | return vid_info; | |
220 | } | |
221 | ||
80d5c368 | 222 | static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, |
5b9ea6e0 | 223 | struct vlan_vid_info **pvid_info) |
87002b03 | 224 | { |
5b9ea6e0 | 225 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 226 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
227 | struct vlan_vid_info *vid_info; |
228 | int err; | |
229 | ||
80d5c368 | 230 | vid_info = vlan_vid_info_alloc(proto, vid); |
5b9ea6e0 JP |
231 | if (!vid_info) |
232 | return -ENOMEM; | |
87002b03 | 233 | |
80d5c368 PM |
234 | if (proto == htons(ETH_P_8021Q) && |
235 | dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) { | |
236 | err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); | |
5b9ea6e0 JP |
237 | if (err) { |
238 | kfree(vid_info); | |
239 | return err; | |
240 | } | |
87002b03 | 241 | } |
5b9ea6e0 JP |
242 | list_add(&vid_info->list, &vlan_info->vid_list); |
243 | vlan_info->nr_vids++; | |
244 | *pvid_info = vid_info; | |
87002b03 JP |
245 | return 0; |
246 | } | |
5b9ea6e0 | 247 | |
80d5c368 | 248 | int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
249 | { |
250 | struct vlan_info *vlan_info; | |
251 | struct vlan_vid_info *vid_info; | |
252 | bool vlan_info_created = false; | |
253 | int err; | |
254 | ||
255 | ASSERT_RTNL(); | |
256 | ||
257 | vlan_info = rtnl_dereference(dev->vlan_info); | |
258 | if (!vlan_info) { | |
259 | vlan_info = vlan_info_alloc(dev); | |
260 | if (!vlan_info) | |
261 | return -ENOMEM; | |
262 | vlan_info_created = true; | |
263 | } | |
80d5c368 | 264 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 | 265 | if (!vid_info) { |
80d5c368 | 266 | err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); |
5b9ea6e0 JP |
267 | if (err) |
268 | goto out_free_vlan_info; | |
269 | } | |
270 | vid_info->refcount++; | |
271 | ||
272 | if (vlan_info_created) | |
273 | rcu_assign_pointer(dev->vlan_info, vlan_info); | |
274 | ||
275 | return 0; | |
276 | ||
277 | out_free_vlan_info: | |
278 | if (vlan_info_created) | |
279 | kfree(vlan_info); | |
280 | return err; | |
281 | } | |
87002b03 JP |
282 | EXPORT_SYMBOL(vlan_vid_add); |
283 | ||
5b9ea6e0 JP |
284 | static void __vlan_vid_del(struct vlan_info *vlan_info, |
285 | struct vlan_vid_info *vid_info) | |
87002b03 | 286 | { |
5b9ea6e0 | 287 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 288 | const struct net_device_ops *ops = dev->netdev_ops; |
80d5c368 PM |
289 | __be16 proto = vid_info->proto; |
290 | u16 vid = vid_info->vid; | |
5b9ea6e0 | 291 | int err; |
87002b03 | 292 | |
80d5c368 PM |
293 | if (proto == htons(ETH_P_8021Q) && |
294 | dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) { | |
295 | err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); | |
5b9ea6e0 | 296 | if (err) { |
80d5c368 PM |
297 | pr_warn("failed to kill vid %04x/%d for device %s\n", |
298 | proto, vid, dev->name); | |
5b9ea6e0 JP |
299 | } |
300 | } | |
301 | list_del(&vid_info->list); | |
302 | kfree(vid_info); | |
303 | vlan_info->nr_vids--; | |
304 | } | |
305 | ||
80d5c368 | 306 | void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
307 | { |
308 | struct vlan_info *vlan_info; | |
309 | struct vlan_vid_info *vid_info; | |
310 | ||
311 | ASSERT_RTNL(); | |
312 | ||
313 | vlan_info = rtnl_dereference(dev->vlan_info); | |
314 | if (!vlan_info) | |
315 | return; | |
316 | ||
80d5c368 | 317 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 JP |
318 | if (!vid_info) |
319 | return; | |
320 | vid_info->refcount--; | |
321 | if (vid_info->refcount == 0) { | |
322 | __vlan_vid_del(vlan_info, vid_info); | |
323 | if (vlan_info->nr_vids == 0) { | |
324 | RCU_INIT_POINTER(dev->vlan_info, NULL); | |
325 | call_rcu(&vlan_info->rcu, vlan_info_rcu_free); | |
326 | } | |
87002b03 JP |
327 | } |
328 | } | |
329 | EXPORT_SYMBOL(vlan_vid_del); | |
348a1443 JP |
330 | |
331 | int vlan_vids_add_by_dev(struct net_device *dev, | |
332 | const struct net_device *by_dev) | |
333 | { | |
334 | struct vlan_vid_info *vid_info; | |
f9586f79 | 335 | struct vlan_info *vlan_info; |
348a1443 JP |
336 | int err; |
337 | ||
338 | ASSERT_RTNL(); | |
339 | ||
f9586f79 DC |
340 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
341 | if (!vlan_info) | |
348a1443 JP |
342 | return 0; |
343 | ||
f9586f79 | 344 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
80d5c368 | 345 | err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
346 | if (err) |
347 | goto unwind; | |
348 | } | |
349 | return 0; | |
350 | ||
351 | unwind: | |
352 | list_for_each_entry_continue_reverse(vid_info, | |
f9586f79 | 353 | &vlan_info->vid_list, |
348a1443 | 354 | list) { |
80d5c368 | 355 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
356 | } |
357 | ||
358 | return err; | |
359 | } | |
360 | EXPORT_SYMBOL(vlan_vids_add_by_dev); | |
361 | ||
362 | void vlan_vids_del_by_dev(struct net_device *dev, | |
363 | const struct net_device *by_dev) | |
364 | { | |
365 | struct vlan_vid_info *vid_info; | |
f9586f79 | 366 | struct vlan_info *vlan_info; |
348a1443 JP |
367 | |
368 | ASSERT_RTNL(); | |
369 | ||
f9586f79 DC |
370 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
371 | if (!vlan_info) | |
348a1443 JP |
372 | return; |
373 | ||
f9586f79 | 374 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) |
80d5c368 | 375 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
376 | } |
377 | EXPORT_SYMBOL(vlan_vids_del_by_dev); | |
9b361c13 JP |
378 | |
379 | bool vlan_uses_dev(const struct net_device *dev) | |
380 | { | |
55462cf3 JP |
381 | struct vlan_info *vlan_info; |
382 | ||
383 | ASSERT_RTNL(); | |
384 | ||
385 | vlan_info = rtnl_dereference(dev->vlan_info); | |
386 | if (!vlan_info) | |
387 | return false; | |
388 | return vlan_info->grp.nr_vlan_devs ? true : false; | |
9b361c13 JP |
389 | } |
390 | EXPORT_SYMBOL(vlan_uses_dev); |