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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 | ||
6a32e4f9 | 8 | bool vlan_do_receive(struct sk_buff **skbp, bool last_handler) |
7750f403 | 9 | { |
3701e513 JG |
10 | struct sk_buff *skb = *skbp; |
11 | u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK; | |
ad1afb00 | 12 | struct net_device *vlan_dev; |
4af429d2 | 13 | struct vlan_pcpu_stats *rx_stats; |
7750f403 | 14 | |
3701e513 JG |
15 | vlan_dev = vlan_find_dev(skb->dev, vlan_id); |
16 | if (!vlan_dev) { | |
6a32e4f9 ED |
17 | /* Only the last call to vlan_do_receive() should change |
18 | * pkt_type to PACKET_OTHERHOST | |
19 | */ | |
20 | if (vlan_id && last_handler) | |
3701e513 JG |
21 | skb->pkt_type = PACKET_OTHERHOST; |
22 | return false; | |
173e79fb | 23 | } |
9b22ea56 | 24 | |
3701e513 JG |
25 | skb = *skbp = skb_share_check(skb, GFP_ATOMIC); |
26 | if (unlikely(!skb)) | |
27 | return false; | |
e1c096e2 | 28 | |
3701e513 | 29 | skb->dev = vlan_dev; |
0b5c9db1 JP |
30 | if (skb->pkt_type == PACKET_OTHERHOST) { |
31 | /* Our lower layer thinks this is not local, let's make sure. | |
32 | * This allows the VLAN to have a different MAC than the | |
33 | * underlying device, and still route correctly. */ | |
34 | if (!compare_ether_addr(eth_hdr(skb)->h_dest, | |
35 | vlan_dev->dev_addr)) | |
36 | skb->pkt_type = PACKET_HOST; | |
37 | } | |
38 | ||
7da82c06 | 39 | if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) { |
0b5c9db1 JP |
40 | unsigned int offset = skb->data - skb_mac_header(skb); |
41 | ||
42 | /* | |
43 | * vlan_insert_tag expect skb->data pointing to mac header. | |
44 | * So change skb->data before calling it and change back to | |
45 | * original position later | |
46 | */ | |
47 | skb_push(skb, offset); | |
48 | skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci); | |
49 | if (!skb) | |
50 | return false; | |
51 | skb_pull(skb, offset + VLAN_HLEN); | |
52 | skb_reset_mac_len(skb); | |
53 | } | |
54 | ||
3701e513 | 55 | skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); |
bc1d0411 | 56 | skb->vlan_tci = 0; |
7750f403 | 57 | |
7da82c06 | 58 | rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); |
9793241f | 59 | |
9618e2ff | 60 | u64_stats_update_begin(&rx_stats->syncp); |
9793241f ED |
61 | rx_stats->rx_packets++; |
62 | rx_stats->rx_bytes += skb->len; | |
0b5c9db1 | 63 | if (skb->pkt_type == PACKET_MULTICAST) |
9618e2ff | 64 | rx_stats->rx_multicast++; |
9618e2ff | 65 | u64_stats_update_end(&rx_stats->syncp); |
3701e513 JG |
66 | |
67 | return true; | |
7750f403 | 68 | } |
22d1ba74 | 69 | |
cec9c133 JP |
70 | /* Must be invoked with rcu_read_lock or with RTNL. */ |
71 | struct net_device *__vlan_find_dev_deep(struct net_device *real_dev, | |
72 | u16 vlan_id) | |
73 | { | |
5b9ea6e0 | 74 | struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info); |
cec9c133 | 75 | |
5b9ea6e0 JP |
76 | if (vlan_info) { |
77 | return vlan_group_get_device(&vlan_info->grp, vlan_id); | |
cec9c133 JP |
78 | } else { |
79 | /* | |
80 | * Bonding slaves do not have grp assigned to themselves. | |
81 | * Grp is assigned to bonding master instead. | |
82 | */ | |
83 | if (netif_is_bond_slave(real_dev)) | |
84 | return __vlan_find_dev_deep(real_dev->master, vlan_id); | |
85 | } | |
86 | ||
87 | return NULL; | |
88 | } | |
89 | EXPORT_SYMBOL(__vlan_find_dev_deep); | |
90 | ||
22d1ba74 PM |
91 | struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
92 | { | |
7da82c06 | 93 | return vlan_dev_priv(dev)->real_dev; |
22d1ba74 | 94 | } |
116cb428 | 95 | EXPORT_SYMBOL(vlan_dev_real_dev); |
22d1ba74 PM |
96 | |
97 | u16 vlan_dev_vlan_id(const struct net_device *dev) | |
98 | { | |
7da82c06 | 99 | return vlan_dev_priv(dev)->vlan_id; |
22d1ba74 | 100 | } |
116cb428 | 101 | EXPORT_SYMBOL(vlan_dev_vlan_id); |
e1c096e2 | 102 | |
0b5c9db1 | 103 | static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) |
bcc6d479 | 104 | { |
0b5c9db1 JP |
105 | if (skb_cow(skb, skb_headroom(skb)) < 0) |
106 | return NULL; | |
107 | memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); | |
108 | skb->mac_header += VLAN_HLEN; | |
109 | skb_reset_mac_len(skb); | |
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); | |
132 | __vlan_hwaccel_put_tag(skb, vlan_tci); | |
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); | |
bcc6d479 JP |
143 | return skb; |
144 | ||
145 | err_free: | |
146 | kfree_skb(skb); | |
147 | return NULL; | |
148 | } | |
87002b03 | 149 | |
5b9ea6e0 JP |
150 | |
151 | /* | |
152 | * vlan info and vid list | |
153 | */ | |
154 | ||
155 | static void vlan_group_free(struct vlan_group *grp) | |
156 | { | |
157 | int i; | |
158 | ||
159 | for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) | |
160 | kfree(grp->vlan_devices_arrays[i]); | |
161 | } | |
162 | ||
163 | static void vlan_info_free(struct vlan_info *vlan_info) | |
164 | { | |
165 | vlan_group_free(&vlan_info->grp); | |
166 | kfree(vlan_info); | |
167 | } | |
168 | ||
169 | static void vlan_info_rcu_free(struct rcu_head *rcu) | |
170 | { | |
171 | vlan_info_free(container_of(rcu, struct vlan_info, rcu)); | |
172 | } | |
173 | ||
174 | static struct vlan_info *vlan_info_alloc(struct net_device *dev) | |
175 | { | |
176 | struct vlan_info *vlan_info; | |
177 | ||
178 | vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); | |
179 | if (!vlan_info) | |
180 | return NULL; | |
181 | ||
182 | vlan_info->real_dev = dev; | |
183 | INIT_LIST_HEAD(&vlan_info->vid_list); | |
184 | return vlan_info; | |
185 | } | |
186 | ||
187 | struct vlan_vid_info { | |
188 | struct list_head list; | |
189 | unsigned short vid; | |
190 | int refcount; | |
191 | }; | |
192 | ||
193 | static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, | |
194 | unsigned short vid) | |
195 | { | |
196 | struct vlan_vid_info *vid_info; | |
197 | ||
198 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { | |
199 | if (vid_info->vid == vid) | |
200 | return vid_info; | |
201 | } | |
202 | return NULL; | |
203 | } | |
204 | ||
205 | static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid) | |
206 | { | |
207 | struct vlan_vid_info *vid_info; | |
208 | ||
209 | vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); | |
210 | if (!vid_info) | |
211 | return NULL; | |
212 | vid_info->vid = vid; | |
213 | ||
214 | return vid_info; | |
215 | } | |
216 | ||
217 | static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid, | |
218 | struct vlan_vid_info **pvid_info) | |
87002b03 | 219 | { |
5b9ea6e0 | 220 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 221 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
222 | struct vlan_vid_info *vid_info; |
223 | int err; | |
224 | ||
225 | vid_info = vlan_vid_info_alloc(vid); | |
226 | if (!vid_info) | |
227 | return -ENOMEM; | |
87002b03 JP |
228 | |
229 | if ((dev->features & NETIF_F_HW_VLAN_FILTER) && | |
5b9ea6e0 JP |
230 | ops->ndo_vlan_rx_add_vid) { |
231 | err = ops->ndo_vlan_rx_add_vid(dev, vid); | |
232 | if (err) { | |
233 | kfree(vid_info); | |
234 | return err; | |
235 | } | |
87002b03 | 236 | } |
5b9ea6e0 JP |
237 | list_add(&vid_info->list, &vlan_info->vid_list); |
238 | vlan_info->nr_vids++; | |
239 | *pvid_info = vid_info; | |
87002b03 JP |
240 | return 0; |
241 | } | |
5b9ea6e0 JP |
242 | |
243 | int vlan_vid_add(struct net_device *dev, unsigned short vid) | |
244 | { | |
245 | struct vlan_info *vlan_info; | |
246 | struct vlan_vid_info *vid_info; | |
247 | bool vlan_info_created = false; | |
248 | int err; | |
249 | ||
250 | ASSERT_RTNL(); | |
251 | ||
252 | vlan_info = rtnl_dereference(dev->vlan_info); | |
253 | if (!vlan_info) { | |
254 | vlan_info = vlan_info_alloc(dev); | |
255 | if (!vlan_info) | |
256 | return -ENOMEM; | |
257 | vlan_info_created = true; | |
258 | } | |
259 | vid_info = vlan_vid_info_get(vlan_info, vid); | |
260 | if (!vid_info) { | |
261 | err = __vlan_vid_add(vlan_info, vid, &vid_info); | |
262 | if (err) | |
263 | goto out_free_vlan_info; | |
264 | } | |
265 | vid_info->refcount++; | |
266 | ||
267 | if (vlan_info_created) | |
268 | rcu_assign_pointer(dev->vlan_info, vlan_info); | |
269 | ||
270 | return 0; | |
271 | ||
272 | out_free_vlan_info: | |
273 | if (vlan_info_created) | |
274 | kfree(vlan_info); | |
275 | return err; | |
276 | } | |
87002b03 JP |
277 | EXPORT_SYMBOL(vlan_vid_add); |
278 | ||
5b9ea6e0 JP |
279 | static void __vlan_vid_del(struct vlan_info *vlan_info, |
280 | struct vlan_vid_info *vid_info) | |
87002b03 | 281 | { |
5b9ea6e0 | 282 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 283 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
284 | unsigned short vid = vid_info->vid; |
285 | int err; | |
87002b03 JP |
286 | |
287 | if ((dev->features & NETIF_F_HW_VLAN_FILTER) && | |
288 | ops->ndo_vlan_rx_kill_vid) { | |
5b9ea6e0 JP |
289 | err = ops->ndo_vlan_rx_kill_vid(dev, vid); |
290 | if (err) { | |
291 | pr_warn("failed to kill vid %d for device %s\n", | |
292 | vid, dev->name); | |
293 | } | |
294 | } | |
295 | list_del(&vid_info->list); | |
296 | kfree(vid_info); | |
297 | vlan_info->nr_vids--; | |
298 | } | |
299 | ||
300 | void vlan_vid_del(struct net_device *dev, unsigned short vid) | |
301 | { | |
302 | struct vlan_info *vlan_info; | |
303 | struct vlan_vid_info *vid_info; | |
304 | ||
305 | ASSERT_RTNL(); | |
306 | ||
307 | vlan_info = rtnl_dereference(dev->vlan_info); | |
308 | if (!vlan_info) | |
309 | return; | |
310 | ||
311 | vid_info = vlan_vid_info_get(vlan_info, vid); | |
312 | if (!vid_info) | |
313 | return; | |
314 | vid_info->refcount--; | |
315 | if (vid_info->refcount == 0) { | |
316 | __vlan_vid_del(vlan_info, vid_info); | |
317 | if (vlan_info->nr_vids == 0) { | |
318 | RCU_INIT_POINTER(dev->vlan_info, NULL); | |
319 | call_rcu(&vlan_info->rcu, vlan_info_rcu_free); | |
320 | } | |
87002b03 JP |
321 | } |
322 | } | |
323 | EXPORT_SYMBOL(vlan_vid_del); | |
348a1443 JP |
324 | |
325 | int vlan_vids_add_by_dev(struct net_device *dev, | |
326 | const struct net_device *by_dev) | |
327 | { | |
328 | struct vlan_vid_info *vid_info; | |
f9586f79 | 329 | struct vlan_info *vlan_info; |
348a1443 JP |
330 | int err; |
331 | ||
332 | ASSERT_RTNL(); | |
333 | ||
f9586f79 DC |
334 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
335 | if (!vlan_info) | |
348a1443 JP |
336 | return 0; |
337 | ||
f9586f79 | 338 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
348a1443 JP |
339 | err = vlan_vid_add(dev, vid_info->vid); |
340 | if (err) | |
341 | goto unwind; | |
342 | } | |
343 | return 0; | |
344 | ||
345 | unwind: | |
346 | list_for_each_entry_continue_reverse(vid_info, | |
f9586f79 | 347 | &vlan_info->vid_list, |
348a1443 JP |
348 | list) { |
349 | vlan_vid_del(dev, vid_info->vid); | |
350 | } | |
351 | ||
352 | return err; | |
353 | } | |
354 | EXPORT_SYMBOL(vlan_vids_add_by_dev); | |
355 | ||
356 | void vlan_vids_del_by_dev(struct net_device *dev, | |
357 | const struct net_device *by_dev) | |
358 | { | |
359 | struct vlan_vid_info *vid_info; | |
f9586f79 | 360 | struct vlan_info *vlan_info; |
348a1443 JP |
361 | |
362 | ASSERT_RTNL(); | |
363 | ||
f9586f79 DC |
364 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
365 | if (!vlan_info) | |
348a1443 JP |
366 | return; |
367 | ||
f9586f79 | 368 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) |
348a1443 JP |
369 | vlan_vid_del(dev, vid_info->vid); |
370 | } | |
371 | EXPORT_SYMBOL(vlan_vids_del_by_dev); |