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)
10 struct sk_buff *skb = *skbp;
11 __be16 vlan_proto = skb->vlan_proto;
12 u16 vlan_id = skb_vlan_tag_get_id(skb);
13 struct net_device *vlan_dev;
14 struct vlan_pcpu_stats *rx_stats;
16 vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id);
20 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
24 if (unlikely(!(vlan_dev->flags & IFF_UP))) {
31 if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
32 /* Our lower layer thinks this is not local, let's make sure.
33 * This allows the VLAN to have a different MAC than the
34 * underlying device, and still route correctly. */
35 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
36 skb->pkt_type = PACKET_HOST;
39 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR) &&
40 !netif_is_macvlan_port(vlan_dev) &&
41 !netif_is_bridge_port(vlan_dev)) {
42 unsigned int offset = skb->data - skb_mac_header(skb);
45 * vlan_insert_tag expect skb->data pointing to mac header.
46 * So change skb->data before calling it and change back to
47 * original position later
49 skb_push(skb, offset);
50 skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto,
54 skb_pull(skb, offset + VLAN_HLEN);
55 skb_reset_mac_len(skb);
58 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
61 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
63 u64_stats_update_begin(&rx_stats->syncp);
64 rx_stats->rx_packets++;
65 rx_stats->rx_bytes += skb->len;
66 if (skb->pkt_type == PACKET_MULTICAST)
67 rx_stats->rx_multicast++;
68 u64_stats_update_end(&rx_stats->syncp);
73 /* Must be invoked with rcu_read_lock. */
74 struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev,
75 __be16 vlan_proto, u16 vlan_id)
77 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
80 return vlan_group_get_device(&vlan_info->grp,
84 * Lower devices of master uppers (bonding, team) do not have
85 * grp assigned to themselves. Grp is assigned to upper device
88 struct net_device *upper_dev;
90 upper_dev = netdev_master_upper_dev_get_rcu(dev);
92 return __vlan_find_dev_deep_rcu(upper_dev,
98 EXPORT_SYMBOL(__vlan_find_dev_deep_rcu);
100 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
102 struct net_device *ret = vlan_dev_priv(dev)->real_dev;
104 while (is_vlan_dev(ret))
105 ret = vlan_dev_priv(ret)->real_dev;
109 EXPORT_SYMBOL(vlan_dev_real_dev);
111 u16 vlan_dev_vlan_id(const struct net_device *dev)
113 return vlan_dev_priv(dev)->vlan_id;
115 EXPORT_SYMBOL(vlan_dev_vlan_id);
117 __be16 vlan_dev_vlan_proto(const struct net_device *dev)
119 return vlan_dev_priv(dev)->vlan_proto;
121 EXPORT_SYMBOL(vlan_dev_vlan_proto);
124 * vlan info and vid list
127 static void vlan_group_free(struct vlan_group *grp)
131 for (i = 0; i < VLAN_PROTO_NUM; i++)
132 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
133 kfree(grp->vlan_devices_arrays[i][j]);
136 static void vlan_info_free(struct vlan_info *vlan_info)
138 vlan_group_free(&vlan_info->grp);
142 static void vlan_info_rcu_free(struct rcu_head *rcu)
144 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
147 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
149 struct vlan_info *vlan_info;
151 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
155 vlan_info->real_dev = dev;
156 INIT_LIST_HEAD(&vlan_info->vid_list);
160 struct vlan_vid_info {
161 struct list_head list;
167 static bool vlan_hw_filter_capable(const struct net_device *dev,
168 const struct vlan_vid_info *vid_info)
170 if (vid_info->proto == htons(ETH_P_8021Q) &&
171 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
173 if (vid_info->proto == htons(ETH_P_8021AD) &&
174 dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
179 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
180 __be16 proto, u16 vid)
182 struct vlan_vid_info *vid_info;
184 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
185 if (vid_info->proto == proto && vid_info->vid == vid)
191 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
193 struct vlan_vid_info *vid_info;
195 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
198 vid_info->proto = proto;
204 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
205 struct vlan_vid_info **pvid_info)
207 struct net_device *dev = vlan_info->real_dev;
208 const struct net_device_ops *ops = dev->netdev_ops;
209 struct vlan_vid_info *vid_info;
212 vid_info = vlan_vid_info_alloc(proto, vid);
216 if (vlan_hw_filter_capable(dev, vid_info)) {
217 if (netif_device_present(dev))
218 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid);
226 list_add(&vid_info->list, &vlan_info->vid_list);
227 vlan_info->nr_vids++;
228 *pvid_info = vid_info;
232 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
234 struct vlan_info *vlan_info;
235 struct vlan_vid_info *vid_info;
236 bool vlan_info_created = false;
241 vlan_info = rtnl_dereference(dev->vlan_info);
243 vlan_info = vlan_info_alloc(dev);
246 vlan_info_created = true;
248 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
250 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
252 goto out_free_vlan_info;
254 vid_info->refcount++;
256 if (vlan_info_created)
257 rcu_assign_pointer(dev->vlan_info, vlan_info);
262 if (vlan_info_created)
266 EXPORT_SYMBOL(vlan_vid_add);
268 static void __vlan_vid_del(struct vlan_info *vlan_info,
269 struct vlan_vid_info *vid_info)
271 struct net_device *dev = vlan_info->real_dev;
272 const struct net_device_ops *ops = dev->netdev_ops;
273 __be16 proto = vid_info->proto;
274 u16 vid = vid_info->vid;
277 if (vlan_hw_filter_capable(dev, vid_info)) {
278 if (netif_device_present(dev))
279 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
283 pr_warn("failed to kill vid %04x/%d for device %s\n",
284 proto, vid, dev->name);
287 list_del(&vid_info->list);
289 vlan_info->nr_vids--;
292 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
294 struct vlan_info *vlan_info;
295 struct vlan_vid_info *vid_info;
299 vlan_info = rtnl_dereference(dev->vlan_info);
303 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
306 vid_info->refcount--;
307 if (vid_info->refcount == 0) {
308 __vlan_vid_del(vlan_info, vid_info);
309 if (vlan_info->nr_vids == 0) {
310 RCU_INIT_POINTER(dev->vlan_info, NULL);
311 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
315 EXPORT_SYMBOL(vlan_vid_del);
317 int vlan_vids_add_by_dev(struct net_device *dev,
318 const struct net_device *by_dev)
320 struct vlan_vid_info *vid_info;
321 struct vlan_info *vlan_info;
326 vlan_info = rtnl_dereference(by_dev->vlan_info);
330 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
331 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
338 list_for_each_entry_continue_reverse(vid_info,
339 &vlan_info->vid_list,
341 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
346 EXPORT_SYMBOL(vlan_vids_add_by_dev);
348 void vlan_vids_del_by_dev(struct net_device *dev,
349 const struct net_device *by_dev)
351 struct vlan_vid_info *vid_info;
352 struct vlan_info *vlan_info;
356 vlan_info = rtnl_dereference(by_dev->vlan_info);
360 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
361 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
363 EXPORT_SYMBOL(vlan_vids_del_by_dev);
365 bool vlan_uses_dev(const struct net_device *dev)
367 struct vlan_info *vlan_info;
371 vlan_info = rtnl_dereference(dev->vlan_info);
374 return vlan_info->grp.nr_vlan_devs ? true : false;
376 EXPORT_SYMBOL(vlan_uses_dev);