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>
8 bool vlan_do_receive(struct sk_buff **skbp, bool last_handler)
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;
15 vlan_dev = vlan_find_dev(skb->dev, vlan_id);
17 /* Only the last call to vlan_do_receive() should change
18 * pkt_type to PACKET_OTHERHOST
20 if (vlan_id && last_handler)
21 skb->pkt_type = PACKET_OTHERHOST;
25 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
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,
36 skb->pkt_type = PACKET_HOST;
39 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
40 unsigned int offset = skb->data - skb_mac_header(skb);
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
47 skb_push(skb, offset);
48 skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
51 skb_pull(skb, offset + VLAN_HLEN);
52 skb_reset_mac_len(skb);
55 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
58 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
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);
70 /* Must be invoked with rcu_read_lock or with RTNL. */
71 struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
74 struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
77 return vlan_group_get_device(&vlan_info->grp, vlan_id);
80 * Bonding slaves do not have grp assigned to themselves.
81 * Grp is assigned to bonding master instead.
83 if (netif_is_bond_slave(real_dev))
84 return __vlan_find_dev_deep(real_dev->master, vlan_id);
89 EXPORT_SYMBOL(__vlan_find_dev_deep);
91 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
93 return vlan_dev_priv(dev)->real_dev;
95 EXPORT_SYMBOL(vlan_dev_real_dev);
97 u16 vlan_dev_vlan_id(const struct net_device *dev)
99 return vlan_dev_priv(dev)->vlan_id;
101 EXPORT_SYMBOL(vlan_dev_vlan_id);
103 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
105 if (skb_cow(skb, skb_headroom(skb)) < 0)
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);
113 struct sk_buff *vlan_untag(struct sk_buff *skb)
115 struct vlan_hdr *vhdr;
118 if (unlikely(vlan_tx_tag_present(skb))) {
119 /* vlan_tci is already set-up so leave this for another time */
123 skb = skb_share_check(skb, GFP_ATOMIC);
127 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
130 vhdr = (struct vlan_hdr *) skb->data;
131 vlan_tci = ntohs(vhdr->h_vlan_TCI);
132 __vlan_hwaccel_put_tag(skb, vlan_tci);
134 skb_pull_rcsum(skb, VLAN_HLEN);
135 vlan_set_encap_proto(skb, vhdr);
137 skb = vlan_reorder_header(skb);
141 skb_reset_network_header(skb);
142 skb_reset_transport_header(skb);
152 * vlan info and vid list
155 static void vlan_group_free(struct vlan_group *grp)
159 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
160 kfree(grp->vlan_devices_arrays[i]);
163 static void vlan_info_free(struct vlan_info *vlan_info)
165 vlan_group_free(&vlan_info->grp);
169 static void vlan_info_rcu_free(struct rcu_head *rcu)
171 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
174 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
176 struct vlan_info *vlan_info;
178 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
182 vlan_info->real_dev = dev;
183 INIT_LIST_HEAD(&vlan_info->vid_list);
187 struct vlan_vid_info {
188 struct list_head list;
193 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
196 struct vlan_vid_info *vid_info;
198 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
199 if (vid_info->vid == vid)
205 static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid)
207 struct vlan_vid_info *vid_info;
209 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
217 static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
218 struct vlan_vid_info **pvid_info)
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;
225 vid_info = vlan_vid_info_alloc(vid);
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);
237 list_add(&vid_info->list, &vlan_info->vid_list);
238 vlan_info->nr_vids++;
239 *pvid_info = vid_info;
243 int vlan_vid_add(struct net_device *dev, unsigned short vid)
245 struct vlan_info *vlan_info;
246 struct vlan_vid_info *vid_info;
247 bool vlan_info_created = false;
252 vlan_info = rtnl_dereference(dev->vlan_info);
254 vlan_info = vlan_info_alloc(dev);
257 vlan_info_created = true;
259 vid_info = vlan_vid_info_get(vlan_info, vid);
261 err = __vlan_vid_add(vlan_info, vid, &vid_info);
263 goto out_free_vlan_info;
265 vid_info->refcount++;
267 if (vlan_info_created)
268 rcu_assign_pointer(dev->vlan_info, vlan_info);
273 if (vlan_info_created)
277 EXPORT_SYMBOL(vlan_vid_add);
279 static void __vlan_vid_del(struct vlan_info *vlan_info,
280 struct vlan_vid_info *vid_info)
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;
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);
291 pr_warn("failed to kill vid %d for device %s\n",
295 list_del(&vid_info->list);
297 vlan_info->nr_vids--;
300 void vlan_vid_del(struct net_device *dev, unsigned short vid)
302 struct vlan_info *vlan_info;
303 struct vlan_vid_info *vid_info;
307 vlan_info = rtnl_dereference(dev->vlan_info);
311 vid_info = vlan_vid_info_get(vlan_info, vid);
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);
323 EXPORT_SYMBOL(vlan_vid_del);
325 int vlan_vids_add_by_dev(struct net_device *dev,
326 const struct net_device *by_dev)
328 struct vlan_vid_info *vid_info;
329 struct vlan_info *vlan_info;
334 vlan_info = rtnl_dereference(by_dev->vlan_info);
338 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
339 err = vlan_vid_add(dev, vid_info->vid);
346 list_for_each_entry_continue_reverse(vid_info,
347 &vlan_info->vid_list,
349 vlan_vid_del(dev, vid_info->vid);
354 EXPORT_SYMBOL(vlan_vids_add_by_dev);
356 void vlan_vids_del_by_dev(struct net_device *dev,
357 const struct net_device *by_dev)
359 struct vlan_vid_info *vid_info;
360 struct vlan_info *vlan_info;
364 vlan_info = rtnl_dereference(by_dev->vlan_info);
368 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
369 vlan_vid_del(dev, vid_info->vid);
371 EXPORT_SYMBOL(vlan_vids_del_by_dev);