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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7750f403 PM |
2 | #include <linux/skbuff.h> |
3 | #include <linux/netdevice.h> | |
4 | #include <linux/if_vlan.h> | |
4ead4431 | 5 | #include <linux/netpoll.h> |
bc3b2d7f | 6 | #include <linux/export.h> |
7750f403 PM |
7 | #include "vlan.h" |
8 | ||
48cc32d3 | 9 | bool vlan_do_receive(struct sk_buff **skbp) |
7750f403 | 10 | { |
3701e513 | 11 | struct sk_buff *skb = *skbp; |
86a9bad3 | 12 | __be16 vlan_proto = skb->vlan_proto; |
df8a39de | 13 | u16 vlan_id = skb_vlan_tag_get_id(skb); |
ad1afb00 | 14 | struct net_device *vlan_dev; |
4af429d2 | 15 | struct vlan_pcpu_stats *rx_stats; |
7750f403 | 16 | |
86a9bad3 | 17 | vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id); |
48cc32d3 | 18 | if (!vlan_dev) |
3701e513 | 19 | return false; |
9b22ea56 | 20 | |
3701e513 JG |
21 | skb = *skbp = skb_share_check(skb, GFP_ATOMIC); |
22 | if (unlikely(!skb)) | |
23 | return false; | |
e769fcec VN |
24 | |
25 | if (unlikely(!(vlan_dev->flags & IFF_UP))) { | |
26 | kfree_skb(skb); | |
27 | *skbp = NULL; | |
28 | return false; | |
29 | } | |
e1c096e2 | 30 | |
3701e513 | 31 | skb->dev = vlan_dev; |
375f67df | 32 | if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) { |
0b5c9db1 JP |
33 | /* Our lower layer thinks this is not local, let's make sure. |
34 | * This allows the VLAN to have a different MAC than the | |
35 | * underlying device, and still route correctly. */ | |
be14cc98 | 36 | if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr)) |
0b5c9db1 JP |
37 | skb->pkt_type = PACKET_HOST; |
38 | } | |
39 | ||
28f9ee22 VY |
40 | if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR) && |
41 | !netif_is_macvlan_port(vlan_dev) && | |
42 | !netif_is_bridge_port(vlan_dev)) { | |
0b5c9db1 JP |
43 | unsigned int offset = skb->data - skb_mac_header(skb); |
44 | ||
45 | /* | |
46 | * vlan_insert_tag expect skb->data pointing to mac header. | |
47 | * So change skb->data before calling it and change back to | |
48 | * original position later | |
49 | */ | |
50 | skb_push(skb, offset); | |
86a9bad3 PM |
51 | skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto, |
52 | skb->vlan_tci); | |
0b5c9db1 JP |
53 | if (!skb) |
54 | return false; | |
55 | skb_pull(skb, offset + VLAN_HLEN); | |
56 | skb_reset_mac_len(skb); | |
57 | } | |
58 | ||
3701e513 | 59 | skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); |
bc1d0411 | 60 | skb->vlan_tci = 0; |
7750f403 | 61 | |
7da82c06 | 62 | rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); |
9793241f | 63 | |
9618e2ff | 64 | u64_stats_update_begin(&rx_stats->syncp); |
9793241f ED |
65 | rx_stats->rx_packets++; |
66 | rx_stats->rx_bytes += skb->len; | |
0b5c9db1 | 67 | if (skb->pkt_type == PACKET_MULTICAST) |
9618e2ff | 68 | rx_stats->rx_multicast++; |
9618e2ff | 69 | u64_stats_update_end(&rx_stats->syncp); |
3701e513 JG |
70 | |
71 | return true; | |
7750f403 | 72 | } |
22d1ba74 | 73 | |
1cdfd72f | 74 | /* Must be invoked with rcu_read_lock. */ |
f06c7f9f | 75 | struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev, |
1fd9b1fc | 76 | __be16 vlan_proto, u16 vlan_id) |
cec9c133 | 77 | { |
1cdfd72f | 78 | struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info); |
cec9c133 | 79 | |
5b9ea6e0 | 80 | if (vlan_info) { |
1fd9b1fc PM |
81 | return vlan_group_get_device(&vlan_info->grp, |
82 | vlan_proto, vlan_id); | |
cec9c133 JP |
83 | } else { |
84 | /* | |
1cdfd72f JP |
85 | * Lower devices of master uppers (bonding, team) do not have |
86 | * grp assigned to themselves. Grp is assigned to upper device | |
87 | * instead. | |
cec9c133 | 88 | */ |
1cdfd72f JP |
89 | struct net_device *upper_dev; |
90 | ||
91 | upper_dev = netdev_master_upper_dev_get_rcu(dev); | |
92 | if (upper_dev) | |
f06c7f9f | 93 | return __vlan_find_dev_deep_rcu(upper_dev, |
1fd9b1fc | 94 | vlan_proto, vlan_id); |
cec9c133 JP |
95 | } |
96 | ||
97 | return NULL; | |
98 | } | |
f06c7f9f | 99 | EXPORT_SYMBOL(__vlan_find_dev_deep_rcu); |
cec9c133 | 100 | |
22d1ba74 PM |
101 | struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
102 | { | |
0369722f | 103 | struct net_device *ret = vlan_dev_priv(dev)->real_dev; |
104 | ||
105 | while (is_vlan_dev(ret)) | |
106 | ret = vlan_dev_priv(ret)->real_dev; | |
107 | ||
108 | return ret; | |
22d1ba74 | 109 | } |
116cb428 | 110 | EXPORT_SYMBOL(vlan_dev_real_dev); |
22d1ba74 PM |
111 | |
112 | u16 vlan_dev_vlan_id(const struct net_device *dev) | |
113 | { | |
7da82c06 | 114 | return vlan_dev_priv(dev)->vlan_id; |
22d1ba74 | 115 | } |
116cb428 | 116 | EXPORT_SYMBOL(vlan_dev_vlan_id); |
e1c096e2 | 117 | |
71e415e4 | 118 | __be16 vlan_dev_vlan_proto(const struct net_device *dev) |
119 | { | |
120 | return vlan_dev_priv(dev)->vlan_proto; | |
121 | } | |
122 | EXPORT_SYMBOL(vlan_dev_vlan_proto); | |
123 | ||
5b9ea6e0 JP |
124 | /* |
125 | * vlan info and vid list | |
126 | */ | |
127 | ||
128 | static void vlan_group_free(struct vlan_group *grp) | |
129 | { | |
cf2c014a | 130 | int i, j; |
5b9ea6e0 | 131 | |
cf2c014a PM |
132 | for (i = 0; i < VLAN_PROTO_NUM; i++) |
133 | for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) | |
134 | kfree(grp->vlan_devices_arrays[i][j]); | |
5b9ea6e0 JP |
135 | } |
136 | ||
137 | static void vlan_info_free(struct vlan_info *vlan_info) | |
138 | { | |
139 | vlan_group_free(&vlan_info->grp); | |
140 | kfree(vlan_info); | |
141 | } | |
142 | ||
143 | static void vlan_info_rcu_free(struct rcu_head *rcu) | |
144 | { | |
145 | vlan_info_free(container_of(rcu, struct vlan_info, rcu)); | |
146 | } | |
147 | ||
148 | static struct vlan_info *vlan_info_alloc(struct net_device *dev) | |
149 | { | |
150 | struct vlan_info *vlan_info; | |
151 | ||
152 | vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); | |
153 | if (!vlan_info) | |
154 | return NULL; | |
155 | ||
156 | vlan_info->real_dev = dev; | |
157 | INIT_LIST_HEAD(&vlan_info->vid_list); | |
158 | return vlan_info; | |
159 | } | |
160 | ||
161 | struct vlan_vid_info { | |
162 | struct list_head list; | |
80d5c368 PM |
163 | __be16 proto; |
164 | u16 vid; | |
5b9ea6e0 JP |
165 | int refcount; |
166 | }; | |
167 | ||
8ad227ff PM |
168 | static bool vlan_hw_filter_capable(const struct net_device *dev, |
169 | const struct vlan_vid_info *vid_info) | |
170 | { | |
171 | if (vid_info->proto == htons(ETH_P_8021Q) && | |
172 | dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) | |
173 | return true; | |
174 | if (vid_info->proto == htons(ETH_P_8021AD) && | |
175 | dev->features & NETIF_F_HW_VLAN_STAG_FILTER) | |
176 | return true; | |
177 | return false; | |
178 | } | |
179 | ||
5b9ea6e0 | 180 | static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, |
80d5c368 | 181 | __be16 proto, u16 vid) |
5b9ea6e0 JP |
182 | { |
183 | struct vlan_vid_info *vid_info; | |
184 | ||
185 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { | |
80d5c368 | 186 | if (vid_info->proto == proto && vid_info->vid == vid) |
5b9ea6e0 JP |
187 | return vid_info; |
188 | } | |
189 | return NULL; | |
190 | } | |
191 | ||
80d5c368 | 192 | static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) |
5b9ea6e0 JP |
193 | { |
194 | struct vlan_vid_info *vid_info; | |
195 | ||
196 | vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); | |
197 | if (!vid_info) | |
198 | return NULL; | |
80d5c368 | 199 | vid_info->proto = proto; |
5b9ea6e0 JP |
200 | vid_info->vid = vid; |
201 | ||
202 | return vid_info; | |
203 | } | |
204 | ||
80d5c368 | 205 | static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, |
5b9ea6e0 | 206 | struct vlan_vid_info **pvid_info) |
87002b03 | 207 | { |
5b9ea6e0 | 208 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 209 | const struct net_device_ops *ops = dev->netdev_ops; |
5b9ea6e0 JP |
210 | struct vlan_vid_info *vid_info; |
211 | int err; | |
212 | ||
80d5c368 | 213 | vid_info = vlan_vid_info_alloc(proto, vid); |
5b9ea6e0 JP |
214 | if (!vid_info) |
215 | return -ENOMEM; | |
87002b03 | 216 | |
8ad227ff | 217 | if (vlan_hw_filter_capable(dev, vid_info)) { |
74f2d19c PR |
218 | if (netif_device_present(dev)) |
219 | err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); | |
220 | else | |
221 | err = -ENODEV; | |
5b9ea6e0 JP |
222 | if (err) { |
223 | kfree(vid_info); | |
224 | return err; | |
225 | } | |
87002b03 | 226 | } |
5b9ea6e0 JP |
227 | list_add(&vid_info->list, &vlan_info->vid_list); |
228 | vlan_info->nr_vids++; | |
229 | *pvid_info = vid_info; | |
87002b03 JP |
230 | return 0; |
231 | } | |
5b9ea6e0 | 232 | |
80d5c368 | 233 | int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
234 | { |
235 | struct vlan_info *vlan_info; | |
236 | struct vlan_vid_info *vid_info; | |
237 | bool vlan_info_created = false; | |
238 | int err; | |
239 | ||
240 | ASSERT_RTNL(); | |
241 | ||
242 | vlan_info = rtnl_dereference(dev->vlan_info); | |
243 | if (!vlan_info) { | |
244 | vlan_info = vlan_info_alloc(dev); | |
245 | if (!vlan_info) | |
246 | return -ENOMEM; | |
247 | vlan_info_created = true; | |
248 | } | |
80d5c368 | 249 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 | 250 | if (!vid_info) { |
80d5c368 | 251 | err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); |
5b9ea6e0 JP |
252 | if (err) |
253 | goto out_free_vlan_info; | |
254 | } | |
255 | vid_info->refcount++; | |
256 | ||
257 | if (vlan_info_created) | |
258 | rcu_assign_pointer(dev->vlan_info, vlan_info); | |
259 | ||
260 | return 0; | |
261 | ||
262 | out_free_vlan_info: | |
263 | if (vlan_info_created) | |
264 | kfree(vlan_info); | |
265 | return err; | |
266 | } | |
87002b03 JP |
267 | EXPORT_SYMBOL(vlan_vid_add); |
268 | ||
5b9ea6e0 JP |
269 | static void __vlan_vid_del(struct vlan_info *vlan_info, |
270 | struct vlan_vid_info *vid_info) | |
87002b03 | 271 | { |
5b9ea6e0 | 272 | struct net_device *dev = vlan_info->real_dev; |
87002b03 | 273 | const struct net_device_ops *ops = dev->netdev_ops; |
80d5c368 PM |
274 | __be16 proto = vid_info->proto; |
275 | u16 vid = vid_info->vid; | |
5b9ea6e0 | 276 | int err; |
87002b03 | 277 | |
8ad227ff | 278 | if (vlan_hw_filter_capable(dev, vid_info)) { |
74f2d19c PR |
279 | if (netif_device_present(dev)) |
280 | err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); | |
281 | else | |
282 | err = -ENODEV; | |
5b9ea6e0 | 283 | if (err) { |
80d5c368 PM |
284 | pr_warn("failed to kill vid %04x/%d for device %s\n", |
285 | proto, vid, dev->name); | |
5b9ea6e0 JP |
286 | } |
287 | } | |
288 | list_del(&vid_info->list); | |
289 | kfree(vid_info); | |
290 | vlan_info->nr_vids--; | |
291 | } | |
292 | ||
80d5c368 | 293 | void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
5b9ea6e0 JP |
294 | { |
295 | struct vlan_info *vlan_info; | |
296 | struct vlan_vid_info *vid_info; | |
297 | ||
298 | ASSERT_RTNL(); | |
299 | ||
300 | vlan_info = rtnl_dereference(dev->vlan_info); | |
301 | if (!vlan_info) | |
302 | return; | |
303 | ||
80d5c368 | 304 | vid_info = vlan_vid_info_get(vlan_info, proto, vid); |
5b9ea6e0 JP |
305 | if (!vid_info) |
306 | return; | |
307 | vid_info->refcount--; | |
308 | if (vid_info->refcount == 0) { | |
309 | __vlan_vid_del(vlan_info, vid_info); | |
310 | if (vlan_info->nr_vids == 0) { | |
311 | RCU_INIT_POINTER(dev->vlan_info, NULL); | |
312 | call_rcu(&vlan_info->rcu, vlan_info_rcu_free); | |
313 | } | |
87002b03 JP |
314 | } |
315 | } | |
316 | EXPORT_SYMBOL(vlan_vid_del); | |
348a1443 JP |
317 | |
318 | int vlan_vids_add_by_dev(struct net_device *dev, | |
319 | const struct net_device *by_dev) | |
320 | { | |
321 | struct vlan_vid_info *vid_info; | |
f9586f79 | 322 | struct vlan_info *vlan_info; |
348a1443 JP |
323 | int err; |
324 | ||
325 | ASSERT_RTNL(); | |
326 | ||
f9586f79 DC |
327 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
328 | if (!vlan_info) | |
348a1443 JP |
329 | return 0; |
330 | ||
f9586f79 | 331 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
80d5c368 | 332 | err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
333 | if (err) |
334 | goto unwind; | |
335 | } | |
336 | return 0; | |
337 | ||
338 | unwind: | |
339 | list_for_each_entry_continue_reverse(vid_info, | |
f9586f79 | 340 | &vlan_info->vid_list, |
348a1443 | 341 | list) { |
80d5c368 | 342 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
343 | } |
344 | ||
345 | return err; | |
346 | } | |
347 | EXPORT_SYMBOL(vlan_vids_add_by_dev); | |
348 | ||
349 | void vlan_vids_del_by_dev(struct net_device *dev, | |
350 | const struct net_device *by_dev) | |
351 | { | |
352 | struct vlan_vid_info *vid_info; | |
f9586f79 | 353 | struct vlan_info *vlan_info; |
348a1443 JP |
354 | |
355 | ASSERT_RTNL(); | |
356 | ||
f9586f79 DC |
357 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
358 | if (!vlan_info) | |
348a1443 JP |
359 | return; |
360 | ||
f9586f79 | 361 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) |
80d5c368 | 362 | vlan_vid_del(dev, vid_info->proto, vid_info->vid); |
348a1443 JP |
363 | } |
364 | EXPORT_SYMBOL(vlan_vids_del_by_dev); | |
9b361c13 JP |
365 | |
366 | bool vlan_uses_dev(const struct net_device *dev) | |
367 | { | |
55462cf3 JP |
368 | struct vlan_info *vlan_info; |
369 | ||
370 | ASSERT_RTNL(); | |
371 | ||
372 | vlan_info = rtnl_dereference(dev->vlan_info); | |
373 | if (!vlan_info) | |
374 | return false; | |
375 | return vlan_info->grp.nr_vlan_devs ? true : false; | |
9b361c13 JP |
376 | } |
377 | EXPORT_SYMBOL(vlan_uses_dev); |