net: wireless: sd8797: change wlan interface to wlan0
[linux-2.6.git] / net / 8021q / vlan_core.c
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
8 bool vlan_do_receive(struct sk_buff **skbp, bool last_handler)
9 {
10         struct sk_buff *skb = *skbp;
11         u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
12         struct net_device *vlan_dev;
13         struct vlan_pcpu_stats *rx_stats;
14
15         vlan_dev = vlan_find_dev(skb->dev, vlan_id);
16         if (!vlan_dev) {
17                 /* Only the last call to vlan_do_receive() should change
18                  * pkt_type to PACKET_OTHERHOST
19                  */
20                 if (vlan_id && last_handler)
21                         skb->pkt_type = PACKET_OTHERHOST;
22                 return false;
23         }
24
25         skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
26         if (unlikely(!skb))
27                 return false;
28
29         skb->dev = vlan_dev;
30         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. */
34                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
35                                         vlan_dev->dev_addr))
36                         skb->pkt_type = PACKET_HOST;
37         }
38
39         if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
40                 unsigned int offset = skb->data - skb_mac_header(skb);
41
42                 /*
43                  * vlan_insert_tag expect skb->data pointing to mac header.
44                  * So change skb->data before calling it and change back to
45                  * original position later
46                  */
47                 skb_push(skb, offset);
48                 skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
49                 if (!skb)
50                         return false;
51                 skb_pull(skb, offset + VLAN_HLEN);
52                 skb_reset_mac_len(skb);
53         }
54
55         skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
56         skb->vlan_tci = 0;
57
58         rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
59
60         u64_stats_update_begin(&rx_stats->syncp);
61         rx_stats->rx_packets++;
62         rx_stats->rx_bytes += skb->len;
63         if (skb->pkt_type == PACKET_MULTICAST)
64                 rx_stats->rx_multicast++;
65         u64_stats_update_end(&rx_stats->syncp);
66
67         return true;
68 }
69
70 /* Must be invoked with rcu_read_lock or with RTNL. */
71 struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
72                                         u16 vlan_id)
73 {
74         struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
75
76         if (vlan_info) {
77                 return vlan_group_get_device(&vlan_info->grp, vlan_id);
78         } else {
79                 /*
80                  * Bonding slaves do not have grp assigned to themselves.
81                  * Grp is assigned to bonding master instead.
82                  */
83                 if (netif_is_bond_slave(real_dev))
84                         return __vlan_find_dev_deep(real_dev->master, vlan_id);
85         }
86
87         return NULL;
88 }
89 EXPORT_SYMBOL(__vlan_find_dev_deep);
90
91 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
92 {
93         return vlan_dev_priv(dev)->real_dev;
94 }
95 EXPORT_SYMBOL(vlan_dev_real_dev);
96
97 u16 vlan_dev_vlan_id(const struct net_device *dev)
98 {
99         return vlan_dev_priv(dev)->vlan_id;
100 }
101 EXPORT_SYMBOL(vlan_dev_vlan_id);
102
103 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
104 {
105         if (skb_cow(skb, skb_headroom(skb)) < 0)
106                 return NULL;
107         memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
108         skb->mac_header += VLAN_HLEN;
109         skb_reset_mac_len(skb);
110         return skb;
111 }
112
113 struct sk_buff *vlan_untag(struct sk_buff *skb)
114 {
115         struct vlan_hdr *vhdr;
116         u16 vlan_tci;
117
118         if (unlikely(vlan_tx_tag_present(skb))) {
119                 /* vlan_tci is already set-up so leave this for another time */
120                 return skb;
121         }
122
123         skb = skb_share_check(skb, GFP_ATOMIC);
124         if (unlikely(!skb))
125                 goto err_free;
126
127         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
128                 goto err_free;
129
130         vhdr = (struct vlan_hdr *) skb->data;
131         vlan_tci = ntohs(vhdr->h_vlan_TCI);
132         __vlan_hwaccel_put_tag(skb, vlan_tci);
133
134         skb_pull_rcsum(skb, VLAN_HLEN);
135         vlan_set_encap_proto(skb, vhdr);
136
137         skb = vlan_reorder_header(skb);
138         if (unlikely(!skb))
139                 goto err_free;
140
141         skb_reset_network_header(skb);
142         skb_reset_transport_header(skb);
143         return skb;
144
145 err_free:
146         kfree_skb(skb);
147         return NULL;
148 }
149
150
151 /*
152  * vlan info and vid list
153  */
154
155 static void vlan_group_free(struct vlan_group *grp)
156 {
157         int i;
158
159         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
160                 kfree(grp->vlan_devices_arrays[i]);
161 }
162
163 static void vlan_info_free(struct vlan_info *vlan_info)
164 {
165         vlan_group_free(&vlan_info->grp);
166         kfree(vlan_info);
167 }
168
169 static void vlan_info_rcu_free(struct rcu_head *rcu)
170 {
171         vlan_info_free(container_of(rcu, struct vlan_info, rcu));
172 }
173
174 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
175 {
176         struct vlan_info *vlan_info;
177
178         vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
179         if (!vlan_info)
180                 return NULL;
181
182         vlan_info->real_dev = dev;
183         INIT_LIST_HEAD(&vlan_info->vid_list);
184         return vlan_info;
185 }
186
187 struct vlan_vid_info {
188         struct list_head list;
189         unsigned short vid;
190         int refcount;
191 };
192
193 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
194                                                unsigned short vid)
195 {
196         struct vlan_vid_info *vid_info;
197
198         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
199                 if (vid_info->vid == vid)
200                         return vid_info;
201         }
202         return NULL;
203 }
204
205 static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid)
206 {
207         struct vlan_vid_info *vid_info;
208
209         vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
210         if (!vid_info)
211                 return NULL;
212         vid_info->vid = vid;
213
214         return vid_info;
215 }
216
217 static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
218                           struct vlan_vid_info **pvid_info)
219 {
220         struct net_device *dev = vlan_info->real_dev;
221         const struct net_device_ops *ops = dev->netdev_ops;
222         struct vlan_vid_info *vid_info;
223         int err;
224
225         vid_info = vlan_vid_info_alloc(vid);
226         if (!vid_info)
227                 return -ENOMEM;
228
229         if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
230             ops->ndo_vlan_rx_add_vid) {
231                 err =  ops->ndo_vlan_rx_add_vid(dev, vid);
232                 if (err) {
233                         kfree(vid_info);
234                         return err;
235                 }
236         }
237         list_add(&vid_info->list, &vlan_info->vid_list);
238         vlan_info->nr_vids++;
239         *pvid_info = vid_info;
240         return 0;
241 }
242
243 int vlan_vid_add(struct net_device *dev, unsigned short vid)
244 {
245         struct vlan_info *vlan_info;
246         struct vlan_vid_info *vid_info;
247         bool vlan_info_created = false;
248         int err;
249
250         ASSERT_RTNL();
251
252         vlan_info = rtnl_dereference(dev->vlan_info);
253         if (!vlan_info) {
254                 vlan_info = vlan_info_alloc(dev);
255                 if (!vlan_info)
256                         return -ENOMEM;
257                 vlan_info_created = true;
258         }
259         vid_info = vlan_vid_info_get(vlan_info, vid);
260         if (!vid_info) {
261                 err = __vlan_vid_add(vlan_info, vid, &vid_info);
262                 if (err)
263                         goto out_free_vlan_info;
264         }
265         vid_info->refcount++;
266
267         if (vlan_info_created)
268                 rcu_assign_pointer(dev->vlan_info, vlan_info);
269
270         return 0;
271
272 out_free_vlan_info:
273         if (vlan_info_created)
274                 kfree(vlan_info);
275         return err;
276 }
277 EXPORT_SYMBOL(vlan_vid_add);
278
279 static void __vlan_vid_del(struct vlan_info *vlan_info,
280                            struct vlan_vid_info *vid_info)
281 {
282         struct net_device *dev = vlan_info->real_dev;
283         const struct net_device_ops *ops = dev->netdev_ops;
284         unsigned short vid = vid_info->vid;
285         int err;
286
287         if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
288              ops->ndo_vlan_rx_kill_vid) {
289                 err = ops->ndo_vlan_rx_kill_vid(dev, vid);
290                 if (err) {
291                         pr_warn("failed to kill vid %d for device %s\n",
292                                 vid, dev->name);
293                 }
294         }
295         list_del(&vid_info->list);
296         kfree(vid_info);
297         vlan_info->nr_vids--;
298 }
299
300 void vlan_vid_del(struct net_device *dev, unsigned short vid)
301 {
302         struct vlan_info *vlan_info;
303         struct vlan_vid_info *vid_info;
304
305         ASSERT_RTNL();
306
307         vlan_info = rtnl_dereference(dev->vlan_info);
308         if (!vlan_info)
309                 return;
310
311         vid_info = vlan_vid_info_get(vlan_info, vid);
312         if (!vid_info)
313                 return;
314         vid_info->refcount--;
315         if (vid_info->refcount == 0) {
316                 __vlan_vid_del(vlan_info, vid_info);
317                 if (vlan_info->nr_vids == 0) {
318                         RCU_INIT_POINTER(dev->vlan_info, NULL);
319                         call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
320                 }
321         }
322 }
323 EXPORT_SYMBOL(vlan_vid_del);
324
325 int vlan_vids_add_by_dev(struct net_device *dev,
326                          const struct net_device *by_dev)
327 {
328         struct vlan_vid_info *vid_info;
329         struct vlan_info *vlan_info;
330         int err;
331
332         ASSERT_RTNL();
333
334         vlan_info = rtnl_dereference(by_dev->vlan_info);
335         if (!vlan_info)
336                 return 0;
337
338         list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
339                 err = vlan_vid_add(dev, vid_info->vid);
340                 if (err)
341                         goto unwind;
342         }
343         return 0;
344
345 unwind:
346         list_for_each_entry_continue_reverse(vid_info,
347                                              &vlan_info->vid_list,
348                                              list) {
349                 vlan_vid_del(dev, vid_info->vid);
350         }
351
352         return err;
353 }
354 EXPORT_SYMBOL(vlan_vids_add_by_dev);
355
356 void vlan_vids_del_by_dev(struct net_device *dev,
357                           const struct net_device *by_dev)
358 {
359         struct vlan_vid_info *vid_info;
360         struct vlan_info *vlan_info;
361
362         ASSERT_RTNL();
363
364         vlan_info = rtnl_dereference(by_dev->vlan_info);
365         if (!vlan_info)
366                 return;
367
368         list_for_each_entry(vid_info, &vlan_info->vid_list, list)
369                 vlan_vid_del(dev, vid_info->vid);
370 }
371 EXPORT_SYMBOL(vlan_vids_del_by_dev);