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1#include <linux/skbuff.h>
2#include <linux/netdevice.h>
3#include <linux/if_vlan.h>
4#include <linux/netpoll.h>
5#include <linux/export.h>
6#include "vlan.h"
7
8bool vlan_do_receive(struct sk_buff **skbp)
9{
10 struct sk_buff *skb = *skbp;
11 __be16 vlan_proto = skb->vlan_proto;
12 u16 vlan_id = vlan_tx_tag_get_id(skb);
13 struct net_device *vlan_dev;
14 struct vlan_pcpu_stats *rx_stats;
15
16 vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id);
17 if (!vlan_dev)
18 return false;
19
20 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
21 if (unlikely(!skb))
22 return false;
23
24 skb->dev = vlan_dev;
25 if (unlikely(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. */
29 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
30 skb->pkt_type = PACKET_HOST;
31 }
32
33 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
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);
42 skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto,
43 skb->vlan_tci);
44 if (!skb)
45 return false;
46 skb_pull(skb, offset + VLAN_HLEN);
47 skb_reset_mac_len(skb);
48 }
49
50 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
51 skb->vlan_tci = 0;
52
53 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
54
55 u64_stats_update_begin(&rx_stats->syncp);
56 rx_stats->rx_packets++;
57 rx_stats->rx_bytes += skb->len;
58 if (skb->pkt_type == PACKET_MULTICAST)
59 rx_stats->rx_multicast++;
60 u64_stats_update_end(&rx_stats->syncp);
61
62 return true;
63}
64
65/* Must be invoked with rcu_read_lock. */
66struct net_device *__vlan_find_dev_deep(struct net_device *dev,
67 __be16 vlan_proto, u16 vlan_id)
68{
69 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
70
71 if (vlan_info) {
72 return vlan_group_get_device(&vlan_info->grp,
73 vlan_proto, vlan_id);
74 } else {
75 /*
76 * Lower devices of master uppers (bonding, team) do not have
77 * grp assigned to themselves. Grp is assigned to upper device
78 * instead.
79 */
80 struct net_device *upper_dev;
81
82 upper_dev = netdev_master_upper_dev_get_rcu(dev);
83 if (upper_dev)
84 return __vlan_find_dev_deep(upper_dev,
85 vlan_proto, vlan_id);
86 }
87
88 return NULL;
89}
90EXPORT_SYMBOL(__vlan_find_dev_deep);
91
92struct net_device *vlan_dev_real_dev(const struct net_device *dev)
93{
94 struct net_device *ret = vlan_dev_priv(dev)->real_dev;
95
96 while (is_vlan_dev(ret))
97 ret = vlan_dev_priv(ret)->real_dev;
98
99 return ret;
100}
101EXPORT_SYMBOL(vlan_dev_real_dev);
102
103u16 vlan_dev_vlan_id(const struct net_device *dev)
104{
105 return vlan_dev_priv(dev)->vlan_id;
106}
107EXPORT_SYMBOL(vlan_dev_vlan_id);
108
109__be16 vlan_dev_vlan_proto(const struct net_device *dev)
110{
111 return vlan_dev_priv(dev)->vlan_proto;
112}
113EXPORT_SYMBOL(vlan_dev_vlan_proto);
114
115static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
116{
117 if (skb_cow(skb, skb_headroom(skb)) < 0)
118 return NULL;
119 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
120 skb->mac_header += VLAN_HLEN;
121 return skb;
122}
123
124struct sk_buff *vlan_untag(struct sk_buff *skb)
125{
126 struct vlan_hdr *vhdr;
127 u16 vlan_tci;
128
129 if (unlikely(vlan_tx_tag_present(skb))) {
130 /* vlan_tci is already set-up so leave this for another time */
131 return skb;
132 }
133
134 skb = skb_share_check(skb, GFP_ATOMIC);
135 if (unlikely(!skb))
136 goto err_free;
137
138 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
139 goto err_free;
140
141 vhdr = (struct vlan_hdr *) skb->data;
142 vlan_tci = ntohs(vhdr->h_vlan_TCI);
143 __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci);
144
145 skb_pull_rcsum(skb, VLAN_HLEN);
146 vlan_set_encap_proto(skb, vhdr);
147
148 skb = vlan_reorder_header(skb);
149 if (unlikely(!skb))
150 goto err_free;
151
152 skb_reset_network_header(skb);
153 skb_reset_transport_header(skb);
154 skb_reset_mac_len(skb);
155
156 return skb;
157
158err_free:
159 kfree_skb(skb);
160 return NULL;
161}
162EXPORT_SYMBOL(vlan_untag);
163
164
165/*
166 * vlan info and vid list
167 */
168
169static void vlan_group_free(struct vlan_group *grp)
170{
171 int i, j;
172
173 for (i = 0; i < VLAN_PROTO_NUM; i++)
174 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
175 kfree(grp->vlan_devices_arrays[i][j]);
176}
177
178static void vlan_info_free(struct vlan_info *vlan_info)
179{
180 vlan_group_free(&vlan_info->grp);
181 kfree(vlan_info);
182}
183
184static void vlan_info_rcu_free(struct rcu_head *rcu)
185{
186 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
187}
188
189static struct vlan_info *vlan_info_alloc(struct net_device *dev)
190{
191 struct vlan_info *vlan_info;
192
193 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
194 if (!vlan_info)
195 return NULL;
196
197 vlan_info->real_dev = dev;
198 INIT_LIST_HEAD(&vlan_info->vid_list);
199 return vlan_info;
200}
201
202struct vlan_vid_info {
203 struct list_head list;
204 __be16 proto;
205 u16 vid;
206 int refcount;
207};
208
209static bool vlan_hw_filter_capable(const struct net_device *dev,
210 const struct vlan_vid_info *vid_info)
211{
212 if (vid_info->proto == htons(ETH_P_8021Q) &&
213 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
214 return true;
215 if (vid_info->proto == htons(ETH_P_8021AD) &&
216 dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
217 return true;
218 return false;
219}
220
221static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
222 __be16 proto, u16 vid)
223{
224 struct vlan_vid_info *vid_info;
225
226 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
227 if (vid_info->proto == proto && vid_info->vid == vid)
228 return vid_info;
229 }
230 return NULL;
231}
232
233static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
234{
235 struct vlan_vid_info *vid_info;
236
237 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
238 if (!vid_info)
239 return NULL;
240 vid_info->proto = proto;
241 vid_info->vid = vid;
242
243 return vid_info;
244}
245
246static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
247 struct vlan_vid_info **pvid_info)
248{
249 struct net_device *dev = vlan_info->real_dev;
250 const struct net_device_ops *ops = dev->netdev_ops;
251 struct vlan_vid_info *vid_info;
252 int err;
253
254 vid_info = vlan_vid_info_alloc(proto, vid);
255 if (!vid_info)
256 return -ENOMEM;
257
258 if (vlan_hw_filter_capable(dev, vid_info)) {
259 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid);
260 if (err) {
261 kfree(vid_info);
262 return err;
263 }
264 }
265 list_add(&vid_info->list, &vlan_info->vid_list);
266 vlan_info->nr_vids++;
267 *pvid_info = vid_info;
268 return 0;
269}
270
271int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
272{
273 struct vlan_info *vlan_info;
274 struct vlan_vid_info *vid_info;
275 bool vlan_info_created = false;
276 int err;
277
278 ASSERT_RTNL();
279
280 vlan_info = rtnl_dereference(dev->vlan_info);
281 if (!vlan_info) {
282 vlan_info = vlan_info_alloc(dev);
283 if (!vlan_info)
284 return -ENOMEM;
285 vlan_info_created = true;
286 }
287 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
288 if (!vid_info) {
289 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
290 if (err)
291 goto out_free_vlan_info;
292 }
293 vid_info->refcount++;
294
295 if (vlan_info_created)
296 rcu_assign_pointer(dev->vlan_info, vlan_info);
297
298 return 0;
299
300out_free_vlan_info:
301 if (vlan_info_created)
302 kfree(vlan_info);
303 return err;
304}
305EXPORT_SYMBOL(vlan_vid_add);
306
307static void __vlan_vid_del(struct vlan_info *vlan_info,
308 struct vlan_vid_info *vid_info)
309{
310 struct net_device *dev = vlan_info->real_dev;
311 const struct net_device_ops *ops = dev->netdev_ops;
312 __be16 proto = vid_info->proto;
313 u16 vid = vid_info->vid;
314 int err;
315
316 if (vlan_hw_filter_capable(dev, vid_info)) {
317 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
318 if (err) {
319 pr_warn("failed to kill vid %04x/%d for device %s\n",
320 proto, vid, dev->name);
321 }
322 }
323 list_del(&vid_info->list);
324 kfree(vid_info);
325 vlan_info->nr_vids--;
326}
327
328void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
329{
330 struct vlan_info *vlan_info;
331 struct vlan_vid_info *vid_info;
332
333 ASSERT_RTNL();
334
335 vlan_info = rtnl_dereference(dev->vlan_info);
336 if (!vlan_info)
337 return;
338
339 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
340 if (!vid_info)
341 return;
342 vid_info->refcount--;
343 if (vid_info->refcount == 0) {
344 __vlan_vid_del(vlan_info, vid_info);
345 if (vlan_info->nr_vids == 0) {
346 RCU_INIT_POINTER(dev->vlan_info, NULL);
347 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
348 }
349 }
350}
351EXPORT_SYMBOL(vlan_vid_del);
352
353int vlan_vids_add_by_dev(struct net_device *dev,
354 const struct net_device *by_dev)
355{
356 struct vlan_vid_info *vid_info;
357 struct vlan_info *vlan_info;
358 int err;
359
360 ASSERT_RTNL();
361
362 vlan_info = rtnl_dereference(by_dev->vlan_info);
363 if (!vlan_info)
364 return 0;
365
366 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
367 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
368 if (err)
369 goto unwind;
370 }
371 return 0;
372
373unwind:
374 list_for_each_entry_continue_reverse(vid_info,
375 &vlan_info->vid_list,
376 list) {
377 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
378 }
379
380 return err;
381}
382EXPORT_SYMBOL(vlan_vids_add_by_dev);
383
384void vlan_vids_del_by_dev(struct net_device *dev,
385 const struct net_device *by_dev)
386{
387 struct vlan_vid_info *vid_info;
388 struct vlan_info *vlan_info;
389
390 ASSERT_RTNL();
391
392 vlan_info = rtnl_dereference(by_dev->vlan_info);
393 if (!vlan_info)
394 return;
395
396 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
397 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
398}
399EXPORT_SYMBOL(vlan_vids_del_by_dev);
400
401bool vlan_uses_dev(const struct net_device *dev)
402{
403 struct vlan_info *vlan_info;
404
405 ASSERT_RTNL();
406
407 vlan_info = rtnl_dereference(dev->vlan_info);
408 if (!vlan_info)
409 return false;
410 return vlan_info->grp.nr_vlan_devs ? true : false;
411}
412EXPORT_SYMBOL(vlan_uses_dev);
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/skbuff.h>
3#include <linux/netdevice.h>
4#include <linux/if_vlan.h>
5#include <linux/netpoll.h>
6#include <linux/export.h>
7#include "vlan.h"
8
9bool vlan_do_receive(struct sk_buff **skbp)
10{
11 struct sk_buff *skb = *skbp;
12 __be16 vlan_proto = skb->vlan_proto;
13 u16 vlan_id = skb_vlan_tag_get_id(skb);
14 struct net_device *vlan_dev;
15 struct vlan_pcpu_stats *rx_stats;
16
17 vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id);
18 if (!vlan_dev)
19 return false;
20
21 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
22 if (unlikely(!skb))
23 return false;
24
25 if (unlikely(!(vlan_dev->flags & IFF_UP))) {
26 kfree_skb(skb);
27 *skbp = NULL;
28 return false;
29 }
30
31 skb->dev = vlan_dev;
32 if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
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. */
36 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
37 skb->pkt_type = PACKET_HOST;
38 }
39
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)) {
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);
51 skb = *skbp = vlan_insert_inner_tag(skb, skb->vlan_proto,
52 skb->vlan_tci, skb->mac_len);
53 if (!skb)
54 return false;
55 skb_pull(skb, offset + VLAN_HLEN);
56 skb_reset_mac_len(skb);
57 }
58
59 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
60 __vlan_hwaccel_clear_tag(skb);
61
62 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
63
64 u64_stats_update_begin(&rx_stats->syncp);
65 rx_stats->rx_packets++;
66 rx_stats->rx_bytes += skb->len;
67 if (skb->pkt_type == PACKET_MULTICAST)
68 rx_stats->rx_multicast++;
69 u64_stats_update_end(&rx_stats->syncp);
70
71 return true;
72}
73
74/* Must be invoked with rcu_read_lock. */
75struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev,
76 __be16 vlan_proto, u16 vlan_id)
77{
78 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
79
80 if (vlan_info) {
81 return vlan_group_get_device(&vlan_info->grp,
82 vlan_proto, vlan_id);
83 } else {
84 /*
85 * Lower devices of master uppers (bonding, team) do not have
86 * grp assigned to themselves. Grp is assigned to upper device
87 * instead.
88 */
89 struct net_device *upper_dev;
90
91 upper_dev = netdev_master_upper_dev_get_rcu(dev);
92 if (upper_dev)
93 return __vlan_find_dev_deep_rcu(upper_dev,
94 vlan_proto, vlan_id);
95 }
96
97 return NULL;
98}
99EXPORT_SYMBOL(__vlan_find_dev_deep_rcu);
100
101struct net_device *vlan_dev_real_dev(const struct net_device *dev)
102{
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;
109}
110EXPORT_SYMBOL(vlan_dev_real_dev);
111
112u16 vlan_dev_vlan_id(const struct net_device *dev)
113{
114 return vlan_dev_priv(dev)->vlan_id;
115}
116EXPORT_SYMBOL(vlan_dev_vlan_id);
117
118__be16 vlan_dev_vlan_proto(const struct net_device *dev)
119{
120 return vlan_dev_priv(dev)->vlan_proto;
121}
122EXPORT_SYMBOL(vlan_dev_vlan_proto);
123
124/*
125 * vlan info and vid list
126 */
127
128static void vlan_group_free(struct vlan_group *grp)
129{
130 int i, j;
131
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]);
135}
136
137static void vlan_info_free(struct vlan_info *vlan_info)
138{
139 vlan_group_free(&vlan_info->grp);
140 kfree(vlan_info);
141}
142
143static void vlan_info_rcu_free(struct rcu_head *rcu)
144{
145 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
146}
147
148static 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
161struct vlan_vid_info {
162 struct list_head list;
163 __be16 proto;
164 u16 vid;
165 int refcount;
166};
167
168static bool vlan_hw_filter_capable(const struct net_device *dev, __be16 proto)
169{
170 if (proto == htons(ETH_P_8021Q) &&
171 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
172 return true;
173 if (proto == htons(ETH_P_8021AD) &&
174 dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
175 return true;
176 return false;
177}
178
179static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
180 __be16 proto, u16 vid)
181{
182 struct vlan_vid_info *vid_info;
183
184 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
185 if (vid_info->proto == proto && vid_info->vid == vid)
186 return vid_info;
187 }
188 return NULL;
189}
190
191static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
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;
198 vid_info->proto = proto;
199 vid_info->vid = vid;
200
201 return vid_info;
202}
203
204static int vlan_add_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid)
205{
206 if (!vlan_hw_filter_capable(dev, proto))
207 return 0;
208
209 if (netif_device_present(dev))
210 return dev->netdev_ops->ndo_vlan_rx_add_vid(dev, proto, vid);
211 else
212 return -ENODEV;
213}
214
215static int vlan_kill_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid)
216{
217 if (!vlan_hw_filter_capable(dev, proto))
218 return 0;
219
220 if (netif_device_present(dev))
221 return dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
222 else
223 return -ENODEV;
224}
225
226int vlan_for_each(struct net_device *dev,
227 int (*action)(struct net_device *dev, int vid, void *arg),
228 void *arg)
229{
230 struct vlan_vid_info *vid_info;
231 struct vlan_info *vlan_info;
232 struct net_device *vdev;
233 int ret;
234
235 ASSERT_RTNL();
236
237 vlan_info = rtnl_dereference(dev->vlan_info);
238 if (!vlan_info)
239 return 0;
240
241 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
242 vdev = vlan_group_get_device(&vlan_info->grp, vid_info->proto,
243 vid_info->vid);
244 ret = action(vdev, vid_info->vid, arg);
245 if (ret)
246 return ret;
247 }
248
249 return 0;
250}
251EXPORT_SYMBOL(vlan_for_each);
252
253int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto)
254{
255 struct net_device *real_dev = vlan_info->real_dev;
256 struct vlan_vid_info *vlan_vid_info;
257 int err;
258
259 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) {
260 if (vlan_vid_info->proto == proto) {
261 err = vlan_add_rx_filter_info(real_dev, proto,
262 vlan_vid_info->vid);
263 if (err)
264 goto unwind;
265 }
266 }
267
268 return 0;
269
270unwind:
271 list_for_each_entry_continue_reverse(vlan_vid_info,
272 &vlan_info->vid_list, list) {
273 if (vlan_vid_info->proto == proto)
274 vlan_kill_rx_filter_info(real_dev, proto,
275 vlan_vid_info->vid);
276 }
277
278 return err;
279}
280EXPORT_SYMBOL(vlan_filter_push_vids);
281
282void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto)
283{
284 struct vlan_vid_info *vlan_vid_info;
285
286 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list)
287 if (vlan_vid_info->proto == proto)
288 vlan_kill_rx_filter_info(vlan_info->real_dev,
289 vlan_vid_info->proto,
290 vlan_vid_info->vid);
291}
292EXPORT_SYMBOL(vlan_filter_drop_vids);
293
294static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
295 struct vlan_vid_info **pvid_info)
296{
297 struct net_device *dev = vlan_info->real_dev;
298 struct vlan_vid_info *vid_info;
299 int err;
300
301 vid_info = vlan_vid_info_alloc(proto, vid);
302 if (!vid_info)
303 return -ENOMEM;
304
305 err = vlan_add_rx_filter_info(dev, proto, vid);
306 if (err) {
307 kfree(vid_info);
308 return err;
309 }
310
311 list_add(&vid_info->list, &vlan_info->vid_list);
312 vlan_info->nr_vids++;
313 *pvid_info = vid_info;
314 return 0;
315}
316
317int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
318{
319 struct vlan_info *vlan_info;
320 struct vlan_vid_info *vid_info;
321 bool vlan_info_created = false;
322 int err;
323
324 ASSERT_RTNL();
325
326 vlan_info = rtnl_dereference(dev->vlan_info);
327 if (!vlan_info) {
328 vlan_info = vlan_info_alloc(dev);
329 if (!vlan_info)
330 return -ENOMEM;
331 vlan_info_created = true;
332 }
333 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
334 if (!vid_info) {
335 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
336 if (err)
337 goto out_free_vlan_info;
338 }
339 vid_info->refcount++;
340
341 if (vlan_info_created)
342 rcu_assign_pointer(dev->vlan_info, vlan_info);
343
344 return 0;
345
346out_free_vlan_info:
347 if (vlan_info_created)
348 kfree(vlan_info);
349 return err;
350}
351EXPORT_SYMBOL(vlan_vid_add);
352
353static void __vlan_vid_del(struct vlan_info *vlan_info,
354 struct vlan_vid_info *vid_info)
355{
356 struct net_device *dev = vlan_info->real_dev;
357 __be16 proto = vid_info->proto;
358 u16 vid = vid_info->vid;
359 int err;
360
361 err = vlan_kill_rx_filter_info(dev, proto, vid);
362 if (err && dev->reg_state != NETREG_UNREGISTERING)
363 netdev_warn(dev, "failed to kill vid %04x/%d\n", proto, vid);
364
365 list_del(&vid_info->list);
366 kfree(vid_info);
367 vlan_info->nr_vids--;
368}
369
370void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
371{
372 struct vlan_info *vlan_info;
373 struct vlan_vid_info *vid_info;
374
375 ASSERT_RTNL();
376
377 vlan_info = rtnl_dereference(dev->vlan_info);
378 if (!vlan_info)
379 return;
380
381 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
382 if (!vid_info)
383 return;
384 vid_info->refcount--;
385 if (vid_info->refcount == 0) {
386 __vlan_vid_del(vlan_info, vid_info);
387 if (vlan_info->nr_vids == 0) {
388 RCU_INIT_POINTER(dev->vlan_info, NULL);
389 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
390 }
391 }
392}
393EXPORT_SYMBOL(vlan_vid_del);
394
395int vlan_vids_add_by_dev(struct net_device *dev,
396 const struct net_device *by_dev)
397{
398 struct vlan_vid_info *vid_info;
399 struct vlan_info *vlan_info;
400 int err;
401
402 ASSERT_RTNL();
403
404 vlan_info = rtnl_dereference(by_dev->vlan_info);
405 if (!vlan_info)
406 return 0;
407
408 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
409 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
410 if (err)
411 goto unwind;
412 }
413 return 0;
414
415unwind:
416 list_for_each_entry_continue_reverse(vid_info,
417 &vlan_info->vid_list,
418 list) {
419 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
420 }
421
422 return err;
423}
424EXPORT_SYMBOL(vlan_vids_add_by_dev);
425
426void vlan_vids_del_by_dev(struct net_device *dev,
427 const struct net_device *by_dev)
428{
429 struct vlan_vid_info *vid_info;
430 struct vlan_info *vlan_info;
431
432 ASSERT_RTNL();
433
434 vlan_info = rtnl_dereference(by_dev->vlan_info);
435 if (!vlan_info)
436 return;
437
438 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
439 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
440}
441EXPORT_SYMBOL(vlan_vids_del_by_dev);
442
443bool vlan_uses_dev(const struct net_device *dev)
444{
445 struct vlan_info *vlan_info;
446
447 ASSERT_RTNL();
448
449 vlan_info = rtnl_dereference(dev->vlan_info);
450 if (!vlan_info)
451 return false;
452 return vlan_info->grp.nr_vlan_devs ? true : false;
453}
454EXPORT_SYMBOL(vlan_uses_dev);
455
456static struct sk_buff *vlan_gro_receive(struct list_head *head,
457 struct sk_buff *skb)
458{
459 const struct packet_offload *ptype;
460 unsigned int hlen, off_vlan;
461 struct sk_buff *pp = NULL;
462 struct vlan_hdr *vhdr;
463 struct sk_buff *p;
464 __be16 type;
465 int flush = 1;
466
467 off_vlan = skb_gro_offset(skb);
468 hlen = off_vlan + sizeof(*vhdr);
469 vhdr = skb_gro_header_fast(skb, off_vlan);
470 if (skb_gro_header_hard(skb, hlen)) {
471 vhdr = skb_gro_header_slow(skb, hlen, off_vlan);
472 if (unlikely(!vhdr))
473 goto out;
474 }
475
476 type = vhdr->h_vlan_encapsulated_proto;
477
478 rcu_read_lock();
479 ptype = gro_find_receive_by_type(type);
480 if (!ptype)
481 goto out_unlock;
482
483 flush = 0;
484
485 list_for_each_entry(p, head, list) {
486 struct vlan_hdr *vhdr2;
487
488 if (!NAPI_GRO_CB(p)->same_flow)
489 continue;
490
491 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
492 if (compare_vlan_header(vhdr, vhdr2))
493 NAPI_GRO_CB(p)->same_flow = 0;
494 }
495
496 skb_gro_pull(skb, sizeof(*vhdr));
497 skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
498 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
499
500out_unlock:
501 rcu_read_unlock();
502out:
503 skb_gro_flush_final(skb, pp, flush);
504
505 return pp;
506}
507
508static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
509{
510 struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
511 __be16 type = vhdr->h_vlan_encapsulated_proto;
512 struct packet_offload *ptype;
513 int err = -ENOENT;
514
515 rcu_read_lock();
516 ptype = gro_find_complete_by_type(type);
517 if (ptype)
518 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr));
519
520 rcu_read_unlock();
521 return err;
522}
523
524static struct packet_offload vlan_packet_offloads[] __read_mostly = {
525 {
526 .type = cpu_to_be16(ETH_P_8021Q),
527 .priority = 10,
528 .callbacks = {
529 .gro_receive = vlan_gro_receive,
530 .gro_complete = vlan_gro_complete,
531 },
532 },
533 {
534 .type = cpu_to_be16(ETH_P_8021AD),
535 .priority = 10,
536 .callbacks = {
537 .gro_receive = vlan_gro_receive,
538 .gro_complete = vlan_gro_complete,
539 },
540 },
541};
542
543static int __init vlan_offload_init(void)
544{
545 unsigned int i;
546
547 for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
548 dev_add_offload(&vlan_packet_offloads[i]);
549
550 return 0;
551}
552
553fs_initcall(vlan_offload_init);