blob: 8ca533c95de0346f181c1acd067a787c20a49f62 [file] [log] [blame]
Patrick McHardy7750f402008-07-08 03:23:36 -07001#include <linux/skbuff.h>
2#include <linux/netdevice.h>
3#include <linux/if_vlan.h>
Herbert Xu4ead4432009-03-01 00:11:52 -08004#include <linux/netpoll.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -04005#include <linux/export.h>
Patrick McHardy7750f402008-07-08 03:23:36 -07006#include "vlan.h"
7
Eric Dumazet6a32e4f2011-10-29 06:13:39 +00008bool vlan_do_receive(struct sk_buff **skbp, bool last_handler)
Patrick McHardy7750f402008-07-08 03:23:36 -07009{
Jesse Gross3701e512010-10-20 13:56:06 +000010 struct sk_buff *skb = *skbp;
11 u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
Pedro Garciaad1afb02010-07-18 15:38:44 -070012 struct net_device *vlan_dev;
Eric Dumazet4af429d2010-11-10 23:42:00 +000013 struct vlan_pcpu_stats *rx_stats;
Pedro Garciaad1afb02010-07-18 15:38:44 -070014
Jesse Gross3701e512010-10-20 13:56:06 +000015 vlan_dev = vlan_find_dev(skb->dev, vlan_id);
16 if (!vlan_dev) {
Eric Dumazet6a32e4f2011-10-29 06:13:39 +000017 /* Only the last call to vlan_do_receive() should change
18 * pkt_type to PACKET_OTHERHOST
19 */
20 if (vlan_id && last_handler)
Jesse Gross3701e512010-10-20 13:56:06 +000021 skb->pkt_type = PACKET_OTHERHOST;
22 return false;
Eric Dumazet173e79f2010-09-30 02:16:44 +000023 }
Patrick McHardy9b22ea52008-11-04 14:49:57 -080024
Jesse Gross3701e512010-10-20 13:56:06 +000025 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
26 if (unlikely(!skb))
27 return false;
Herbert Xue1c096e2009-01-06 10:50:09 -080028
Jesse Gross3701e512010-10-20 13:56:06 +000029 skb->dev = vlan_dev;
Jiri Pirko0b5c9db2011-06-10 06:56:58 +000030 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. */
Joe Perches53a2b3a2012-05-08 18:56:47 +000034 if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
Jiri Pirko0b5c9db2011-06-10 06:56:58 +000035 skb->pkt_type = PACKET_HOST;
36 }
37
Jiri Pirko7da82c02011-12-08 04:11:15 +000038 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
Jiri Pirko0b5c9db2011-06-10 06:56:58 +000039 unsigned int offset = skb->data - skb_mac_header(skb);
40
41 /*
42 * vlan_insert_tag expect skb->data pointing to mac header.
43 * So change skb->data before calling it and change back to
44 * original position later
45 */
46 skb_push(skb, offset);
47 skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
48 if (!skb)
49 return false;
50 skb_pull(skb, offset + VLAN_HLEN);
51 skb_reset_mac_len(skb);
52 }
53
Jesse Gross3701e512010-10-20 13:56:06 +000054 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
Patrick McHardybc1d0412008-07-14 22:49:30 -070055 skb->vlan_tci = 0;
Patrick McHardy7750f402008-07-08 03:23:36 -070056
Jiri Pirko7da82c02011-12-08 04:11:15 +000057 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
Eric Dumazet97932412009-11-17 04:53:09 +000058
Eric Dumazet9618e2f2010-06-24 00:55:06 +000059 u64_stats_update_begin(&rx_stats->syncp);
Eric Dumazet97932412009-11-17 04:53:09 +000060 rx_stats->rx_packets++;
61 rx_stats->rx_bytes += skb->len;
Jiri Pirko0b5c9db2011-06-10 06:56:58 +000062 if (skb->pkt_type == PACKET_MULTICAST)
Eric Dumazet9618e2f2010-06-24 00:55:06 +000063 rx_stats->rx_multicast++;
Eric Dumazet9618e2f2010-06-24 00:55:06 +000064 u64_stats_update_end(&rx_stats->syncp);
Jesse Gross3701e512010-10-20 13:56:06 +000065
66 return true;
Patrick McHardy7750f402008-07-08 03:23:36 -070067}
Patrick McHardy22d1ba72008-07-08 03:23:57 -070068
Jiri Pirkocec9c132011-07-20 04:54:05 +000069/* Must be invoked with rcu_read_lock or with RTNL. */
70struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
71 u16 vlan_id)
72{
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +000073 struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
Jiri Pirkocec9c132011-07-20 04:54:05 +000074
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +000075 if (vlan_info) {
76 return vlan_group_get_device(&vlan_info->grp, vlan_id);
Jiri Pirkocec9c132011-07-20 04:54:05 +000077 } else {
78 /*
79 * Bonding slaves do not have grp assigned to themselves.
80 * Grp is assigned to bonding master instead.
81 */
82 if (netif_is_bond_slave(real_dev))
83 return __vlan_find_dev_deep(real_dev->master, vlan_id);
84 }
85
86 return NULL;
87}
88EXPORT_SYMBOL(__vlan_find_dev_deep);
89
Patrick McHardy22d1ba72008-07-08 03:23:57 -070090struct net_device *vlan_dev_real_dev(const struct net_device *dev)
91{
Jiri Pirko7da82c02011-12-08 04:11:15 +000092 return vlan_dev_priv(dev)->real_dev;
Patrick McHardy22d1ba72008-07-08 03:23:57 -070093}
Ben Greear116cb422009-01-26 12:37:53 -080094EXPORT_SYMBOL(vlan_dev_real_dev);
Patrick McHardy22d1ba72008-07-08 03:23:57 -070095
96u16 vlan_dev_vlan_id(const struct net_device *dev)
97{
Jiri Pirko7da82c02011-12-08 04:11:15 +000098 return vlan_dev_priv(dev)->vlan_id;
Patrick McHardy22d1ba72008-07-08 03:23:57 -070099}
Ben Greear116cb422009-01-26 12:37:53 -0800100EXPORT_SYMBOL(vlan_dev_vlan_id);
Herbert Xue1c096e2009-01-06 10:50:09 -0800101
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000102static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
Jiri Pirkobcc6d472011-04-07 19:48:33 +0000103{
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000104 if (skb_cow(skb, skb_headroom(skb)) < 0)
105 return NULL;
106 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
107 skb->mac_header += VLAN_HLEN;
108 skb_reset_mac_len(skb);
Jiri Pirkobcc6d472011-04-07 19:48:33 +0000109 return skb;
110}
111
Jiri Pirkobcc6d472011-04-07 19:48:33 +0000112struct sk_buff *vlan_untag(struct sk_buff *skb)
113{
114 struct vlan_hdr *vhdr;
115 u16 vlan_tci;
116
117 if (unlikely(vlan_tx_tag_present(skb))) {
118 /* vlan_tci is already set-up so leave this for another time */
119 return skb;
120 }
121
122 skb = skb_share_check(skb, GFP_ATOMIC);
123 if (unlikely(!skb))
124 goto err_free;
125
126 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
127 goto err_free;
128
129 vhdr = (struct vlan_hdr *) skb->data;
130 vlan_tci = ntohs(vhdr->h_vlan_TCI);
131 __vlan_hwaccel_put_tag(skb, vlan_tci);
132
133 skb_pull_rcsum(skb, VLAN_HLEN);
134 vlan_set_encap_proto(skb, vhdr);
135
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000136 skb = vlan_reorder_header(skb);
Jiri Pirkobcc6d472011-04-07 19:48:33 +0000137 if (unlikely(!skb))
138 goto err_free;
139
Jiri Pirkoc5114cd2011-08-18 21:29:27 -0700140 skb_reset_network_header(skb);
141 skb_reset_transport_header(skb);
Jiri Pirkobcc6d472011-04-07 19:48:33 +0000142 return skb;
143
144err_free:
145 kfree_skb(skb);
146 return NULL;
147}
Jiri Pirko87002b02011-12-08 04:11:17 +0000148
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000149
150/*
151 * vlan info and vid list
152 */
153
154static void vlan_group_free(struct vlan_group *grp)
Jiri Pirko87002b02011-12-08 04:11:17 +0000155{
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000156 int i;
157
158 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
159 kfree(grp->vlan_devices_arrays[i]);
160}
161
162static void vlan_info_free(struct vlan_info *vlan_info)
163{
164 vlan_group_free(&vlan_info->grp);
165 kfree(vlan_info);
166}
167
168static void vlan_info_rcu_free(struct rcu_head *rcu)
169{
170 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
171}
172
173static struct vlan_info *vlan_info_alloc(struct net_device *dev)
174{
175 struct vlan_info *vlan_info;
176
177 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
178 if (!vlan_info)
179 return NULL;
180
181 vlan_info->real_dev = dev;
182 INIT_LIST_HEAD(&vlan_info->vid_list);
183 return vlan_info;
184}
185
186struct vlan_vid_info {
187 struct list_head list;
188 unsigned short vid;
189 int refcount;
190};
191
192static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
193 unsigned short vid)
194{
195 struct vlan_vid_info *vid_info;
196
197 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
198 if (vid_info->vid == vid)
199 return vid_info;
200 }
201 return NULL;
202}
203
204static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid)
205{
206 struct vlan_vid_info *vid_info;
207
208 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
209 if (!vid_info)
210 return NULL;
211 vid_info->vid = vid;
212
213 return vid_info;
214}
215
216static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
217 struct vlan_vid_info **pvid_info)
218{
219 struct net_device *dev = vlan_info->real_dev;
Jiri Pirko87002b02011-12-08 04:11:17 +0000220 const struct net_device_ops *ops = dev->netdev_ops;
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000221 struct vlan_vid_info *vid_info;
222 int err;
223
224 vid_info = vlan_vid_info_alloc(vid);
225 if (!vid_info)
226 return -ENOMEM;
Jiri Pirko87002b02011-12-08 04:11:17 +0000227
228 if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000229 ops->ndo_vlan_rx_add_vid) {
230 err = ops->ndo_vlan_rx_add_vid(dev, vid);
231 if (err) {
232 kfree(vid_info);
233 return err;
234 }
Jiri Pirko87002b02011-12-08 04:11:17 +0000235 }
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000236 list_add(&vid_info->list, &vlan_info->vid_list);
237 vlan_info->nr_vids++;
238 *pvid_info = vid_info;
Jiri Pirko87002b02011-12-08 04:11:17 +0000239 return 0;
240}
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000241
242int vlan_vid_add(struct net_device *dev, unsigned short vid)
243{
244 struct vlan_info *vlan_info;
245 struct vlan_vid_info *vid_info;
246 bool vlan_info_created = false;
247 int err;
248
249 ASSERT_RTNL();
250
251 vlan_info = rtnl_dereference(dev->vlan_info);
252 if (!vlan_info) {
253 vlan_info = vlan_info_alloc(dev);
254 if (!vlan_info)
255 return -ENOMEM;
256 vlan_info_created = true;
257 }
258 vid_info = vlan_vid_info_get(vlan_info, vid);
259 if (!vid_info) {
260 err = __vlan_vid_add(vlan_info, vid, &vid_info);
261 if (err)
262 goto out_free_vlan_info;
263 }
264 vid_info->refcount++;
265
266 if (vlan_info_created)
267 rcu_assign_pointer(dev->vlan_info, vlan_info);
268
269 return 0;
270
271out_free_vlan_info:
272 if (vlan_info_created)
273 kfree(vlan_info);
274 return err;
275}
Jiri Pirko87002b02011-12-08 04:11:17 +0000276EXPORT_SYMBOL(vlan_vid_add);
277
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000278static void __vlan_vid_del(struct vlan_info *vlan_info,
279 struct vlan_vid_info *vid_info)
Jiri Pirko87002b02011-12-08 04:11:17 +0000280{
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000281 struct net_device *dev = vlan_info->real_dev;
Jiri Pirko87002b02011-12-08 04:11:17 +0000282 const struct net_device_ops *ops = dev->netdev_ops;
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000283 unsigned short vid = vid_info->vid;
284 int err;
Jiri Pirko87002b02011-12-08 04:11:17 +0000285
286 if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
287 ops->ndo_vlan_rx_kill_vid) {
Jiri Pirko5b9ea6e2011-12-08 04:11:18 +0000288 err = ops->ndo_vlan_rx_kill_vid(dev, vid);
289 if (err) {
290 pr_warn("failed to kill vid %d for device %s\n",
291 vid, dev->name);
292 }
293 }
294 list_del(&vid_info->list);
295 kfree(vid_info);
296 vlan_info->nr_vids--;
297}
298
299void vlan_vid_del(struct net_device *dev, unsigned short vid)
300{
301 struct vlan_info *vlan_info;
302 struct vlan_vid_info *vid_info;
303
304 ASSERT_RTNL();
305
306 vlan_info = rtnl_dereference(dev->vlan_info);
307 if (!vlan_info)
308 return;
309
310 vid_info = vlan_vid_info_get(vlan_info, vid);
311 if (!vid_info)
312 return;
313 vid_info->refcount--;
314 if (vid_info->refcount == 0) {
315 __vlan_vid_del(vlan_info, vid_info);
316 if (vlan_info->nr_vids == 0) {
317 RCU_INIT_POINTER(dev->vlan_info, NULL);
318 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
319 }
Jiri Pirko87002b02011-12-08 04:11:17 +0000320 }
321}
322EXPORT_SYMBOL(vlan_vid_del);
Jiri Pirko348a1442011-12-08 04:11:19 +0000323
324int vlan_vids_add_by_dev(struct net_device *dev,
325 const struct net_device *by_dev)
326{
327 struct vlan_vid_info *vid_info;
Dan Carpenterf9586f72011-12-13 20:29:43 +0000328 struct vlan_info *vlan_info;
Jiri Pirko348a1442011-12-08 04:11:19 +0000329 int err;
330
331 ASSERT_RTNL();
332
Dan Carpenterf9586f72011-12-13 20:29:43 +0000333 vlan_info = rtnl_dereference(by_dev->vlan_info);
334 if (!vlan_info)
Jiri Pirko348a1442011-12-08 04:11:19 +0000335 return 0;
336
Dan Carpenterf9586f72011-12-13 20:29:43 +0000337 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
Jiri Pirko348a1442011-12-08 04:11:19 +0000338 err = vlan_vid_add(dev, vid_info->vid);
339 if (err)
340 goto unwind;
341 }
342 return 0;
343
344unwind:
345 list_for_each_entry_continue_reverse(vid_info,
Dan Carpenterf9586f72011-12-13 20:29:43 +0000346 &vlan_info->vid_list,
Jiri Pirko348a1442011-12-08 04:11:19 +0000347 list) {
348 vlan_vid_del(dev, vid_info->vid);
349 }
350
351 return err;
352}
353EXPORT_SYMBOL(vlan_vids_add_by_dev);
354
355void vlan_vids_del_by_dev(struct net_device *dev,
356 const struct net_device *by_dev)
357{
358 struct vlan_vid_info *vid_info;
Dan Carpenterf9586f72011-12-13 20:29:43 +0000359 struct vlan_info *vlan_info;
Jiri Pirko348a1442011-12-08 04:11:19 +0000360
361 ASSERT_RTNL();
362
Dan Carpenterf9586f72011-12-13 20:29:43 +0000363 vlan_info = rtnl_dereference(by_dev->vlan_info);
364 if (!vlan_info)
Jiri Pirko348a1442011-12-08 04:11:19 +0000365 return;
366
Dan Carpenterf9586f72011-12-13 20:29:43 +0000367 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
Jiri Pirko348a1442011-12-08 04:11:19 +0000368 vlan_vid_del(dev, vid_info->vid);
369}
370EXPORT_SYMBOL(vlan_vids_del_by_dev);