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 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 | 15 | vlan_dev = vlan_find_dev(skb->dev, vlan_id); |
48cc32d3 | 16 | if (!vlan_dev) |
3701e513 | 17 | return false; |
9b22ea56 | 18 | |
3701e513 JG |
19 | skb = *skbp = skb_share_check(skb, GFP_ATOMIC); |
20 | if (unlikely(!skb)) | |
21 | return false; | |
e1c096e2 | 22 | |
3701e513 | 23 | skb->dev = vlan_dev; |
0b5c9db1 JP |
24 | if (skb->pkt_type == PACKET_OTHERHOST) { |
25 | /* Our lower layer thinks this is not local, let's make sure. | |
26 | * This allows the VLAN to have a different MAC than the | |
27 | * underlying device, and still route correctly. */ | |
53a2b3a1 | 28 | if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr)) |
0b5c9db1 JP |
29 | skb->pkt_type = PACKET_HOST; |
30 | } | |
31 | ||
7da82c06 | 32 | if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) { |
0b5c9db1 JP |
33 | unsigned int offset = skb->data - skb_mac_header(skb); |
34 | ||
35 | /* | |
36 | * vlan_insert_tag expect skb->data pointing to mac header. | |
37 | * So change skb->data before calling it and change back to | |
38 | * original position later | |
39 | */ | |
40 | skb_push(skb, offset); | |
41 | skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci); | |
42 | if (!skb) | |
43 | return false; | |
44 | skb_pull(skb, offset + VLAN_HLEN); | |
45 | skb_reset_mac_len(skb); | |
46 | } | |
47 | ||
3701e513 | 48 | skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); |
bc1d0411 | 49 | skb->vlan_tci = 0; |
7750f403 | 50 | |
7da82c06 | 51 | rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); |
9793241f | 52 | |
9618e2ff | 53 | u64_stats_update_begin(&rx_stats->syncp); |
9793241f ED |
54 | rx_stats->rx_packets++; |
55 | rx_stats->rx_bytes += skb->len; | |
0b5c9db1 | 56 | if (skb->pkt_type == PACKET_MULTICAST) |
9618e2ff | 57 | rx_stats->rx_multicast++; |
9618e2ff | 58 | u64_stats_update_end(&rx_stats->syncp); |
3701e513 JG |
59 | |
60 | return true; | |
7750f403 | 61 | } |
22d1ba74 | 62 | |
1cdfd72f JP |
63 | /* Must be invoked with rcu_read_lock. */ |
64 | struct net_device *__vlan_find_dev_deep(struct net_device *dev, | |
cec9c133 JP |
65 | u16 vlan_id) |
66 | { | |
1cdfd72f | 67 | struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info); |
cec9c133 | 68 | |
5b9ea6e0 JP |
69 | if (vlan_info) { |
70 | return vlan_group_get_device(&vlan_info->grp, vlan_id); | |
cec9c133 JP |
71 | } else { |
72 | /* | |
1cdfd72f JP |
73 | * Lower devices of master uppers (bonding, team) do not have |
74 | * grp assigned to themselves. Grp is assigned to upper device | |
75 | * instead. | |
cec9c133 | 76 | */ |
1cdfd72f JP |
77 | struct net_device *upper_dev; |
78 | ||
79 | upper_dev = netdev_master_upper_dev_get_rcu(dev); | |
80 | if (upper_dev) | |
81 | return __vlan_find_dev_deep(upper_dev, vlan_id); | |
cec9c133 JP |
82 | } |
83 | ||
84 | return NULL; | |
85 | } | |
86 | EXPORT_SYMBOL(__vlan_find_dev_deep); | |
87 | ||
22d1ba74 PM |
88 | struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
89 | { | |
7da82c06 | 90 | return vlan_dev_priv(dev)->real_dev; |
22d1ba74 | 91 | } |
116cb428 | 92 | EXPORT_SYMBOL(vlan_dev_real_dev); |
22d1ba74 PM |
93 | |
94 | u16 vlan_dev_vlan_id(const struct net_device *dev) | |
95 | { | |
7da82c06 | 96 | return vlan_dev_priv(dev)->vlan_id; |
22d1ba74 | 97 | } |
116cb428 | 98 | EXPORT_SYMBOL(vlan_dev_vlan_id); |
e1c096e2 | 99 | |
0b5c9db1 | 100 | static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) |
bcc6d479 | 101 | { |
0b5c9db1 JP |
102 | if (skb_cow(skb, skb_headroom(skb)) < 0) |
103 | return NULL; | |
104 | memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); | |
105 | skb->mac_header += VLAN_HLEN; | |
bcc6d479 JP |
106 | return skb; |
107 | } | |
108 | ||
bcc6d479 JP |
109 | struct sk_buff *vlan_untag(struct sk_buff *skb) |
110 | { | |
111 | struct vlan_hdr *vhdr; | |
112 | u16 vlan_tci; | |
113 | ||
114 | if (unlikely(vlan_tx_tag_present(skb))) { | |
115 | /* vlan_tci is already set-up so leave this for another time */ | |
116 | return skb; | |
117 | } | |
118 | ||
119 | skb = skb_share_check(skb, GFP_ATOMIC); | |
120 | if (unlikely(!skb)) | |
121 | goto err_free; | |
122 | ||
123 | if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) | |
124 | goto err_free; | |
125 | ||
126 | vhdr = (struct vlan_hdr *) skb->data; | |
127 | vlan_tci = ntohs(vhdr->h_vlan_TCI); | |
128 | __vlan_hwaccel_put_tag(skb, vlan_tci); | |
129 | ||
130 | skb_pull_rcsum(skb, VLAN_HLEN); | |
131 | vlan_set_encap_proto(skb, vhdr); | |
132 | ||
0b5c9db1 | 133 | skb = vlan_reorder_header(skb); |
bcc6d479 JP |
134 | if (unlikely(!skb)) |
135 | goto err_free; | |
136 | ||
c5114cd5 JP |
137 | skb_reset_network_header(skb); |
138 | skb_reset_transport_header(skb); | |
5316cf9a AQ |
139 | skb_reset_mac_len(skb); |
140 | ||
bcc6d479 JP |
141 | return skb; |
142 | ||
143 | err_free: | |
144 | kfree_skb(skb); | |
145 | return NULL; | |
146 | } | |
87002b03 | 147 | |
5b9ea6e0 JP |
148 | |
149 | /* | |
150 | * vlan info and vid list | |
151 | */ | |
152 | ||
153 | static void vlan_group_free(struct vlan_group *grp) | |
154 | { | |
155 | int i; | |
156 | ||
157 | for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) | |
158 | kfree(grp->vlan_devices_arrays[i]); | |
159 | } | |
160 | ||
161 | static void vlan_info_free(struct vlan_info *vlan_info) | |
162 | { | |
163 | vlan_group_free(&vlan_info->grp); | |
164 | kfree(vlan_info); | |
165 | } | |
166 | ||
167 | static void vlan_info_rcu_free(struct rcu_head *rcu) | |
168 | { | |
169 | vlan_info_free(container_of(rcu, struct vlan_info, rcu)); | |
170 | } | |
171 | ||
172 | static struct vlan_info *vlan_info_alloc(struct net_device *dev) | |
173 | { | |
174 | struct vlan_info *vlan_info; | |
175 | ||
176 | vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); | |
177 | if (!vlan_info) | |
178 | return NULL; | |
179 | ||
180 | vlan_info->real_dev = dev; | |
181 | INIT_LIST_HEAD(&vlan_info->vid_list); | |
182 | return vlan_info; | |
183 | } | |
184 | ||
185 | struct vlan_vid_info { | |
186 | struct list_head list; | |
187 | unsigned short vid; | |
188 | int refcount; | |
189 | }; | |
190 | ||
191 | static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, | |
192 | unsigned short vid) | |
193 | { | |
194 | struct vlan_vid_info *vid_info; | |
195 | ||
196 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { | |
197 | if (vid_info->vid == vid) | |
198 | return vid_info; | |
199 | } | |
200 | return NULL; | |
201 | } | |
202 | ||
203 | static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid) | |
204 | { | |
205 | struct vlan_vid_info *vid_info; | |
206 | ||
207 | vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); | |
208 | if (!vid_info) | |
209 | return NULL; | |
210 | vid_info->vid = vid; | |
211 | ||
212 | return vid_info; | |
213 | } | |
214 | ||
215 | static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid, | |
216 | struct vlan_vid_info **pvid_info) | |
87002b03 | 217 | { |
5b9ea6e0 | 218 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 219 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
220 | struct vlan_vid_info *vid_info; |
221 | int err; | |
222 | ||
223 | vid_info = vlan_vid_info_alloc(vid); | |
224 | if (!vid_info) | |
225 | return -ENOMEM; | |
87002b03 | 226 | |
d2ed273d | 227 | if (dev->features & NETIF_F_HW_VLAN_FILTER) { |
5b9ea6e0 JP |
228 | err = ops->ndo_vlan_rx_add_vid(dev, vid); |
229 | if (err) { | |
230 | kfree(vid_info); | |
231 | return err; | |
232 | } | |
87002b03 | 233 | } |
5b9ea6e0 JP |
234 | list_add(&vid_info->list, &vlan_info->vid_list); |
235 | vlan_info->nr_vids++; | |
236 | *pvid_info = vid_info; | |
87002b03 JP |
237 | return 0; |
238 | } | |
5b9ea6e0 JP |
239 | |
240 | int vlan_vid_add(struct net_device *dev, unsigned short vid) | |
241 | { | |
242 | struct vlan_info *vlan_info; | |
243 | struct vlan_vid_info *vid_info; | |
244 | bool vlan_info_created = false; | |
245 | int err; | |
246 | ||
247 | ASSERT_RTNL(); | |
248 | ||
249 | vlan_info = rtnl_dereference(dev->vlan_info); | |
250 | if (!vlan_info) { | |
251 | vlan_info = vlan_info_alloc(dev); | |
252 | if (!vlan_info) | |
253 | return -ENOMEM; | |
254 | vlan_info_created = true; | |
255 | } | |
256 | vid_info = vlan_vid_info_get(vlan_info, vid); | |
257 | if (!vid_info) { | |
258 | err = __vlan_vid_add(vlan_info, vid, &vid_info); | |
259 | if (err) | |
260 | goto out_free_vlan_info; | |
261 | } | |
262 | vid_info->refcount++; | |
263 | ||
264 | if (vlan_info_created) | |
265 | rcu_assign_pointer(dev->vlan_info, vlan_info); | |
266 | ||
267 | return 0; | |
268 | ||
269 | out_free_vlan_info: | |
270 | if (vlan_info_created) | |
271 | kfree(vlan_info); | |
272 | return err; | |
273 | } | |
87002b03 JP |
274 | EXPORT_SYMBOL(vlan_vid_add); |
275 | ||
5b9ea6e0 JP |
276 | static void __vlan_vid_del(struct vlan_info *vlan_info, |
277 | struct vlan_vid_info *vid_info) | |
87002b03 | 278 | { |
5b9ea6e0 | 279 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 280 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
281 | unsigned short vid = vid_info->vid; |
282 | int err; | |
87002b03 | 283 | |
d2ed273d | 284 | if (dev->features & NETIF_F_HW_VLAN_FILTER) { |
5b9ea6e0 JP |
285 | err = ops->ndo_vlan_rx_kill_vid(dev, vid); |
286 | if (err) { | |
287 | pr_warn("failed to kill vid %d for device %s\n", | |
288 | vid, dev->name); | |
289 | } | |
290 | } | |
291 | list_del(&vid_info->list); | |
292 | kfree(vid_info); | |
293 | vlan_info->nr_vids--; | |
294 | } | |
295 | ||
296 | void vlan_vid_del(struct net_device *dev, unsigned short vid) | |
297 | { | |
298 | struct vlan_info *vlan_info; | |
299 | struct vlan_vid_info *vid_info; | |
300 | ||
301 | ASSERT_RTNL(); | |
302 | ||
303 | vlan_info = rtnl_dereference(dev->vlan_info); | |
304 | if (!vlan_info) | |
305 | return; | |
306 | ||
307 | vid_info = vlan_vid_info_get(vlan_info, vid); | |
308 | if (!vid_info) | |
309 | return; | |
310 | vid_info->refcount--; | |
311 | if (vid_info->refcount == 0) { | |
312 | __vlan_vid_del(vlan_info, vid_info); | |
313 | if (vlan_info->nr_vids == 0) { | |
314 | RCU_INIT_POINTER(dev->vlan_info, NULL); | |
315 | call_rcu(&vlan_info->rcu, vlan_info_rcu_free); | |
316 | } | |
87002b03 JP |
317 | } |
318 | } | |
319 | EXPORT_SYMBOL(vlan_vid_del); | |
348a1443 JP |
320 | |
321 | int vlan_vids_add_by_dev(struct net_device *dev, | |
322 | const struct net_device *by_dev) | |
323 | { | |
324 | struct vlan_vid_info *vid_info; | |
f9586f79 | 325 | struct vlan_info *vlan_info; |
348a1443 JP |
326 | int err; |
327 | ||
328 | ASSERT_RTNL(); | |
329 | ||
f9586f79 DC |
330 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
331 | if (!vlan_info) | |
348a1443 JP |
332 | return 0; |
333 | ||
f9586f79 | 334 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
348a1443 JP |
335 | err = vlan_vid_add(dev, vid_info->vid); |
336 | if (err) | |
337 | goto unwind; | |
338 | } | |
339 | return 0; | |
340 | ||
341 | unwind: | |
342 | list_for_each_entry_continue_reverse(vid_info, | |
f9586f79 | 343 | &vlan_info->vid_list, |
348a1443 JP |
344 | list) { |
345 | vlan_vid_del(dev, vid_info->vid); | |
346 | } | |
347 | ||
348 | return err; | |
349 | } | |
350 | EXPORT_SYMBOL(vlan_vids_add_by_dev); | |
351 | ||
352 | void vlan_vids_del_by_dev(struct net_device *dev, | |
353 | const struct net_device *by_dev) | |
354 | { | |
355 | struct vlan_vid_info *vid_info; | |
f9586f79 | 356 | struct vlan_info *vlan_info; |
348a1443 JP |
357 | |
358 | ASSERT_RTNL(); | |
359 | ||
f9586f79 DC |
360 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
361 | if (!vlan_info) | |
348a1443 JP |
362 | return; |
363 | ||
f9586f79 | 364 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) |
348a1443 JP |
365 | vlan_vid_del(dev, vid_info->vid); |
366 | } | |
367 | EXPORT_SYMBOL(vlan_vids_del_by_dev); | |
9b361c13 JP |
368 | |
369 | bool vlan_uses_dev(const struct net_device *dev) | |
370 | { | |
55462cf3 JP |
371 | struct vlan_info *vlan_info; |
372 | ||
373 | ASSERT_RTNL(); | |
374 | ||
375 | vlan_info = rtnl_dereference(dev->vlan_info); | |
376 | if (!vlan_info) | |
377 | return false; | |
378 | return vlan_info->grp.nr_vlan_devs ? true : false; | |
9b361c13 JP |
379 | } |
380 | EXPORT_SYMBOL(vlan_uses_dev); |