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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; |
df8a39de | 12 | u16 vlan_id = skb_vlan_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; | |
e769fcec VN |
23 | |
24 | if (unlikely(!(vlan_dev->flags & IFF_UP))) { | |
25 | kfree_skb(skb); | |
26 | *skbp = NULL; | |
27 | return false; | |
28 | } | |
e1c096e2 | 29 | |
3701e513 | 30 | skb->dev = vlan_dev; |
375f67df | 31 | if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) { |
0b5c9db1 JP |
32 | /* Our lower layer thinks this is not local, let's make sure. |
33 | * This allows the VLAN to have a different MAC than the | |
34 | * underlying device, and still route correctly. */ | |
be14cc98 | 35 | if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr)) |
0b5c9db1 JP |
36 | skb->pkt_type = PACKET_HOST; |
37 | } | |
38 | ||
28f9ee22 VY |
39 | if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR) && |
40 | !netif_is_macvlan_port(vlan_dev) && | |
41 | !netif_is_bridge_port(vlan_dev)) { | |
0b5c9db1 JP |
42 | unsigned int offset = skb->data - skb_mac_header(skb); |
43 | ||
44 | /* | |
45 | * vlan_insert_tag expect skb->data pointing to mac header. | |
46 | * So change skb->data before calling it and change back to | |
47 | * original position later | |
48 | */ | |
49 | skb_push(skb, offset); | |
86a9bad3 PM |
50 | skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto, |
51 | skb->vlan_tci); | |
0b5c9db1 JP |
52 | if (!skb) |
53 | return false; | |
54 | skb_pull(skb, offset + VLAN_HLEN); | |
55 | skb_reset_mac_len(skb); | |
56 | } | |
57 | ||
3701e513 | 58 | skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); |
bc1d0411 | 59 | skb->vlan_tci = 0; |
7750f403 | 60 | |
7da82c06 | 61 | rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); |
9793241f | 62 | |
9618e2ff | 63 | u64_stats_update_begin(&rx_stats->syncp); |
9793241f ED |
64 | rx_stats->rx_packets++; |
65 | rx_stats->rx_bytes += skb->len; | |
0b5c9db1 | 66 | if (skb->pkt_type == PACKET_MULTICAST) |
9618e2ff | 67 | rx_stats->rx_multicast++; |
9618e2ff | 68 | u64_stats_update_end(&rx_stats->syncp); |
3701e513 JG |
69 | |
70 | return true; | |
7750f403 | 71 | } |
22d1ba74 | 72 | |
1cdfd72f | 73 | /* Must be invoked with rcu_read_lock. */ |
f06c7f9f | 74 | struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev, |
1fd9b1fc | 75 | __be16 vlan_proto, u16 vlan_id) |
cec9c133 | 76 | { |
1cdfd72f | 77 | struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info); |
cec9c133 | 78 | |
5b9ea6e0 | 79 | if (vlan_info) { |
1fd9b1fc PM |
80 | return vlan_group_get_device(&vlan_info->grp, |
81 | vlan_proto, vlan_id); | |
cec9c133 JP |
82 | } else { |
83 | /* | |
1cdfd72f JP |
84 | * Lower devices of master uppers (bonding, team) do not have |
85 | * grp assigned to themselves. Grp is assigned to upper device | |
86 | * instead. | |
cec9c133 | 87 | */ |
1cdfd72f JP |
88 | struct net_device *upper_dev; |
89 | ||
90 | upper_dev = netdev_master_upper_dev_get_rcu(dev); | |
91 | if (upper_dev) | |
f06c7f9f | 92 | return __vlan_find_dev_deep_rcu(upper_dev, |
1fd9b1fc | 93 | vlan_proto, vlan_id); |
cec9c133 JP |
94 | } |
95 | ||
96 | return NULL; | |
97 | } | |
f06c7f9f | 98 | EXPORT_SYMBOL(__vlan_find_dev_deep_rcu); |
cec9c133 | 99 | |
22d1ba74 PM |
100 | struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
101 | { | |
0369722f | 102 | struct net_device *ret = vlan_dev_priv(dev)->real_dev; |
103 | ||
104 | while (is_vlan_dev(ret)) | |
105 | ret = vlan_dev_priv(ret)->real_dev; | |
106 | ||
107 | return ret; | |
22d1ba74 | 108 | } |
116cb428 | 109 | EXPORT_SYMBOL(vlan_dev_real_dev); |
22d1ba74 PM |
110 | |
111 | u16 vlan_dev_vlan_id(const struct net_device *dev) | |
112 | { | |
7da82c06 | 113 | return vlan_dev_priv(dev)->vlan_id; |
22d1ba74 | 114 | } |
116cb428 | 115 | EXPORT_SYMBOL(vlan_dev_vlan_id); |
e1c096e2 | 116 | |
71e415e4 | 117 | __be16 vlan_dev_vlan_proto(const struct net_device *dev) |
118 | { | |
119 | return vlan_dev_priv(dev)->vlan_proto; | |
120 | } | |
121 | EXPORT_SYMBOL(vlan_dev_vlan_proto); | |
122 | ||
5b9ea6e0 JP |
123 | /* |
124 | * vlan info and vid list | |
125 | */ | |
126 | ||
127 | static void vlan_group_free(struct vlan_group *grp) | |
128 | { | |
cf2c014a | 129 | int i, j; |
5b9ea6e0 | 130 | |
cf2c014a PM |
131 | for (i = 0; i < VLAN_PROTO_NUM; i++) |
132 | for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) | |
133 | kfree(grp->vlan_devices_arrays[i][j]); | |
5b9ea6e0 JP |
134 | } |
135 | ||
136 | static void vlan_info_free(struct vlan_info *vlan_info) | |
137 | { | |
138 | vlan_group_free(&vlan_info->grp); | |
139 | kfree(vlan_info); | |
140 | } | |
141 | ||
142 | static void vlan_info_rcu_free(struct rcu_head *rcu) | |
143 | { | |
144 | vlan_info_free(container_of(rcu, struct vlan_info, rcu)); | |
145 | } | |
146 | ||
147 | static struct vlan_info *vlan_info_alloc(struct net_device *dev) | |
148 | { | |
149 | struct vlan_info *vlan_info; | |
150 | ||
151 | vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); | |
152 | if (!vlan_info) | |
153 | return NULL; | |
154 | ||
155 | vlan_info->real_dev = dev; | |
156 | INIT_LIST_HEAD(&vlan_info->vid_list); | |
157 | return vlan_info; | |
158 | } | |
159 | ||
160 | struct vlan_vid_info { | |
161 | struct list_head list; | |
80d5c368 PM |
162 | __be16 proto; |
163 | u16 vid; | |
5b9ea6e0 JP |
164 | int refcount; |
165 | }; | |
166 | ||
8ad227ff PM |
167 | static bool vlan_hw_filter_capable(const struct net_device *dev, |
168 | const struct vlan_vid_info *vid_info) | |
169 | { | |
170 | if (vid_info->proto == htons(ETH_P_8021Q) && | |
171 | dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) | |
172 | return true; | |
173 | if (vid_info->proto == htons(ETH_P_8021AD) && | |
174 | dev->features & NETIF_F_HW_VLAN_STAG_FILTER) | |
175 | return true; | |
176 | return false; | |
177 | } | |
178 | ||
5b9ea6e0 | 179 | static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, |
80d5c368 | 180 | __be16 proto, u16 vid) |
5b9ea6e0 JP |
181 | { |
182 | struct vlan_vid_info *vid_info; | |
183 | ||
184 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { | |
80d5c368 | 185 | if (vid_info->proto == proto && vid_info->vid == vid) |
5b9ea6e0 JP |
186 | return vid_info; |
187 | } | |
188 | return NULL; | |
189 | } | |
190 | ||
80d5c368 | 191 | static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) |
5b9ea6e0 JP |
192 | { |
193 | struct vlan_vid_info *vid_info; | |
194 | ||
195 | vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); | |
196 | if (!vid_info) | |
197 | return NULL; | |
80d5c368 | 198 | vid_info->proto = proto; |
5b9ea6e0 JP |
199 | vid_info->vid = vid; |
200 | ||
201 | return vid_info; | |
202 | } | |
203 | ||
80d5c368 | 204 | static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, |
5b9ea6e0 | 205 | struct vlan_vid_info **pvid_info) |
87002b03 | 206 | { |
5b9ea6e0 | 207 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 208 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
209 | struct vlan_vid_info *vid_info; |
210 | int err; | |
211 | ||
80d5c368 | 212 | vid_info = vlan_vid_info_alloc(proto, vid); |
5b9ea6e0 JP |
213 | if (!vid_info) |
214 | return -ENOMEM; | |
87002b03 | 215 | |
8ad227ff | 216 | if (vlan_hw_filter_capable(dev, vid_info)) { |
74f2d19c PR |
217 | if (netif_device_present(dev)) |
218 | err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); | |
219 | else | |
220 | err = -ENODEV; | |
5b9ea6e0 JP |
221 | if (err) { |
222 | kfree(vid_info); | |
223 | return err; | |
224 | } | |
87002b03 | 225 | } |
5b9ea6e0 JP |
226 | list_add(&vid_info->list, &vlan_info->vid_list); |
227 | vlan_info->nr_vids++; | |
228 | *pvid_info = vid_info; | |
87002b03 JP |
229 | return 0; |
230 | } | |
5b9ea6e0 | 231 | |
80d5c368 | 232 | int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
233 | { |
234 | struct vlan_info *vlan_info; | |
235 | struct vlan_vid_info *vid_info; | |
236 | bool vlan_info_created = false; | |
237 | int err; | |
238 | ||
239 | ASSERT_RTNL(); | |
240 | ||
241 | vlan_info = rtnl_dereference(dev->vlan_info); | |
242 | if (!vlan_info) { | |
243 | vlan_info = vlan_info_alloc(dev); | |
244 | if (!vlan_info) | |
245 | return -ENOMEM; | |
246 | vlan_info_created = true; | |
247 | } | |
80d5c368 | 248 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 | 249 | if (!vid_info) { |
80d5c368 | 250 | err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); |
5b9ea6e0 JP |
251 | if (err) |
252 | goto out_free_vlan_info; | |
253 | } | |
254 | vid_info->refcount++; | |
255 | ||
256 | if (vlan_info_created) | |
257 | rcu_assign_pointer(dev->vlan_info, vlan_info); | |
258 | ||
259 | return 0; | |
260 | ||
261 | out_free_vlan_info: | |
262 | if (vlan_info_created) | |
263 | kfree(vlan_info); | |
264 | return err; | |
265 | } | |
87002b03 JP |
266 | EXPORT_SYMBOL(vlan_vid_add); |
267 | ||
5b9ea6e0 JP |
268 | static void __vlan_vid_del(struct vlan_info *vlan_info, |
269 | struct vlan_vid_info *vid_info) | |
87002b03 | 270 | { |
5b9ea6e0 | 271 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 272 | const struct net_device_ops *ops = dev->netdev_ops; |
80d5c368 PM |
273 | __be16 proto = vid_info->proto; |
274 | u16 vid = vid_info->vid; | |
5b9ea6e0 | 275 | int err; |
87002b03 | 276 | |
8ad227ff | 277 | if (vlan_hw_filter_capable(dev, vid_info)) { |
74f2d19c PR |
278 | if (netif_device_present(dev)) |
279 | err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); | |
280 | else | |
281 | err = -ENODEV; | |
5b9ea6e0 | 282 | if (err) { |
80d5c368 PM |
283 | pr_warn("failed to kill vid %04x/%d for device %s\n", |
284 | proto, vid, dev->name); | |
5b9ea6e0 JP |
285 | } |
286 | } | |
287 | list_del(&vid_info->list); | |
288 | kfree(vid_info); | |
289 | vlan_info->nr_vids--; | |
290 | } | |
291 | ||
80d5c368 | 292 | void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
293 | { |
294 | struct vlan_info *vlan_info; | |
295 | struct vlan_vid_info *vid_info; | |
296 | ||
297 | ASSERT_RTNL(); | |
298 | ||
299 | vlan_info = rtnl_dereference(dev->vlan_info); | |
300 | if (!vlan_info) | |
301 | return; | |
302 | ||
80d5c368 | 303 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 JP |
304 | if (!vid_info) |
305 | return; | |
306 | vid_info->refcount--; | |
307 | if (vid_info->refcount == 0) { | |
308 | __vlan_vid_del(vlan_info, vid_info); | |
309 | if (vlan_info->nr_vids == 0) { | |
310 | RCU_INIT_POINTER(dev->vlan_info, NULL); | |
311 | call_rcu(&vlan_info->rcu, vlan_info_rcu_free); | |
312 | } | |
87002b03 JP |
313 | } |
314 | } | |
315 | EXPORT_SYMBOL(vlan_vid_del); | |
348a1443 JP |
316 | |
317 | int vlan_vids_add_by_dev(struct net_device *dev, | |
318 | const struct net_device *by_dev) | |
319 | { | |
320 | struct vlan_vid_info *vid_info; | |
f9586f79 | 321 | struct vlan_info *vlan_info; |
348a1443 JP |
322 | int err; |
323 | ||
324 | ASSERT_RTNL(); | |
325 | ||
f9586f79 DC |
326 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
327 | if (!vlan_info) | |
348a1443 JP |
328 | return 0; |
329 | ||
f9586f79 | 330 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
80d5c368 | 331 | err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
332 | if (err) |
333 | goto unwind; | |
334 | } | |
335 | return 0; | |
336 | ||
337 | unwind: | |
338 | list_for_each_entry_continue_reverse(vid_info, | |
f9586f79 | 339 | &vlan_info->vid_list, |
348a1443 | 340 | list) { |
80d5c368 | 341 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
342 | } |
343 | ||
344 | return err; | |
345 | } | |
346 | EXPORT_SYMBOL(vlan_vids_add_by_dev); | |
347 | ||
348 | void vlan_vids_del_by_dev(struct net_device *dev, | |
349 | const struct net_device *by_dev) | |
350 | { | |
351 | struct vlan_vid_info *vid_info; | |
f9586f79 | 352 | struct vlan_info *vlan_info; |
348a1443 JP |
353 | |
354 | ASSERT_RTNL(); | |
355 | ||
f9586f79 DC |
356 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
357 | if (!vlan_info) | |
348a1443 JP |
358 | return; |
359 | ||
f9586f79 | 360 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) |
80d5c368 | 361 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
362 | } |
363 | EXPORT_SYMBOL(vlan_vids_del_by_dev); | |
9b361c13 JP |
364 | |
365 | bool vlan_uses_dev(const struct net_device *dev) | |
366 | { | |
55462cf3 JP |
367 | struct vlan_info *vlan_info; |
368 | ||
369 | ASSERT_RTNL(); | |
370 | ||
371 | vlan_info = rtnl_dereference(dev->vlan_info); | |
372 | if (!vlan_info) | |
373 | return false; | |
374 | return vlan_info->grp.nr_vlan_devs ? true : false; | |
9b361c13 JP |
375 | } |
376 | EXPORT_SYMBOL(vlan_uses_dev); |