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 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);
19 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
24 if (skb->pkt_type == PACKET_OTHERHOST) {
25 /* Our lower layer thinks this is not local, let's make sure.
26 * This allows the VLAN to have a different MAC than the
27 * underlying device, and still route correctly. */
28 if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
29 skb->pkt_type = PACKET_HOST;
32 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
33 unsigned int offset = skb->data - skb_mac_header(skb);
36 * vlan_insert_tag expect skb->data pointing to mac header.
37 * So change skb->data before calling it and change back to
38 * original position later
40 skb_push(skb, offset);
41 skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
44 skb_pull(skb, offset + VLAN_HLEN);
45 skb_reset_mac_len(skb);
48 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
51 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
53 u64_stats_update_begin(&rx_stats->syncp);
54 rx_stats->rx_packets++;
55 rx_stats->rx_bytes += skb->len;
56 if (skb->pkt_type == PACKET_MULTICAST)
57 rx_stats->rx_multicast++;
58 u64_stats_update_end(&rx_stats->syncp);
63 /* Must be invoked with rcu_read_lock. */
64 struct net_device *__vlan_find_dev_deep(struct net_device *dev,
67 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
70 return vlan_group_get_device(&vlan_info->grp, vlan_id);
73 * Lower devices of master uppers (bonding, team) do not have
74 * grp assigned to themselves. Grp is assigned to upper device
77 struct net_device *upper_dev;
79 upper_dev = netdev_master_upper_dev_get_rcu(dev);
81 return __vlan_find_dev_deep(upper_dev, vlan_id);
86 EXPORT_SYMBOL(__vlan_find_dev_deep);
88 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
90 return vlan_dev_priv(dev)->real_dev;
92 EXPORT_SYMBOL(vlan_dev_real_dev);
94 u16 vlan_dev_vlan_id(const struct net_device *dev)
96 return vlan_dev_priv(dev)->vlan_id;
98 EXPORT_SYMBOL(vlan_dev_vlan_id);
100 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
102 if (skb_cow(skb, skb_headroom(skb)) < 0)
104 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
105 skb->mac_header += VLAN_HLEN;
109 struct sk_buff *vlan_untag(struct sk_buff *skb)
111 struct vlan_hdr *vhdr;
114 if (unlikely(vlan_tx_tag_present(skb))) {
115 /* vlan_tci is already set-up so leave this for another time */
119 skb = skb_share_check(skb, GFP_ATOMIC);
123 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
126 vhdr = (struct vlan_hdr *) skb->data;
127 vlan_tci = ntohs(vhdr->h_vlan_TCI);
128 __vlan_hwaccel_put_tag(skb, vlan_tci);
130 skb_pull_rcsum(skb, VLAN_HLEN);
131 vlan_set_encap_proto(skb, vhdr);
133 skb = vlan_reorder_header(skb);
137 skb_reset_network_header(skb);
138 skb_reset_transport_header(skb);
139 skb_reset_mac_len(skb);
147 EXPORT_SYMBOL(vlan_untag);
151 * vlan info and vid list
154 static void vlan_group_free(struct vlan_group *grp)
158 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
159 kfree(grp->vlan_devices_arrays[i]);
162 static void vlan_info_free(struct vlan_info *vlan_info)
164 vlan_group_free(&vlan_info->grp);
168 static void vlan_info_rcu_free(struct rcu_head *rcu)
170 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
173 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
175 struct vlan_info *vlan_info;
177 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
181 vlan_info->real_dev = dev;
182 INIT_LIST_HEAD(&vlan_info->vid_list);
186 struct vlan_vid_info {
187 struct list_head list;
192 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
195 struct vlan_vid_info *vid_info;
197 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
198 if (vid_info->vid == vid)
204 static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid)
206 struct vlan_vid_info *vid_info;
208 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
216 static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
217 struct vlan_vid_info **pvid_info)
219 struct net_device *dev = vlan_info->real_dev;
220 const struct net_device_ops *ops = dev->netdev_ops;
221 struct vlan_vid_info *vid_info;
224 vid_info = vlan_vid_info_alloc(vid);
228 if (dev->features & NETIF_F_HW_VLAN_FILTER) {
229 err = ops->ndo_vlan_rx_add_vid(dev, vid);
235 list_add(&vid_info->list, &vlan_info->vid_list);
236 vlan_info->nr_vids++;
237 *pvid_info = vid_info;
241 int vlan_vid_add(struct net_device *dev, unsigned short vid)
243 struct vlan_info *vlan_info;
244 struct vlan_vid_info *vid_info;
245 bool vlan_info_created = false;
250 vlan_info = rtnl_dereference(dev->vlan_info);
252 vlan_info = vlan_info_alloc(dev);
255 vlan_info_created = true;
257 vid_info = vlan_vid_info_get(vlan_info, vid);
259 err = __vlan_vid_add(vlan_info, vid, &vid_info);
261 goto out_free_vlan_info;
263 vid_info->refcount++;
265 if (vlan_info_created)
266 rcu_assign_pointer(dev->vlan_info, vlan_info);
271 if (vlan_info_created)
275 EXPORT_SYMBOL(vlan_vid_add);
277 static void __vlan_vid_del(struct vlan_info *vlan_info,
278 struct vlan_vid_info *vid_info)
280 struct net_device *dev = vlan_info->real_dev;
281 const struct net_device_ops *ops = dev->netdev_ops;
282 unsigned short vid = vid_info->vid;
285 if (dev->features & NETIF_F_HW_VLAN_FILTER) {
286 err = ops->ndo_vlan_rx_kill_vid(dev, vid);
288 pr_warn("failed to kill vid %d for device %s\n",
292 list_del(&vid_info->list);
294 vlan_info->nr_vids--;
297 void vlan_vid_del(struct net_device *dev, unsigned short vid)
299 struct vlan_info *vlan_info;
300 struct vlan_vid_info *vid_info;
304 vlan_info = rtnl_dereference(dev->vlan_info);
308 vid_info = vlan_vid_info_get(vlan_info, vid);
311 vid_info->refcount--;
312 if (vid_info->refcount == 0) {
313 __vlan_vid_del(vlan_info, vid_info);
314 if (vlan_info->nr_vids == 0) {
315 RCU_INIT_POINTER(dev->vlan_info, NULL);
316 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
320 EXPORT_SYMBOL(vlan_vid_del);
322 int vlan_vids_add_by_dev(struct net_device *dev,
323 const struct net_device *by_dev)
325 struct vlan_vid_info *vid_info;
326 struct vlan_info *vlan_info;
331 vlan_info = rtnl_dereference(by_dev->vlan_info);
335 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
336 err = vlan_vid_add(dev, vid_info->vid);
343 list_for_each_entry_continue_reverse(vid_info,
344 &vlan_info->vid_list,
346 vlan_vid_del(dev, vid_info->vid);
351 EXPORT_SYMBOL(vlan_vids_add_by_dev);
353 void vlan_vids_del_by_dev(struct net_device *dev,
354 const struct net_device *by_dev)
356 struct vlan_vid_info *vid_info;
357 struct vlan_info *vlan_info;
361 vlan_info = rtnl_dereference(by_dev->vlan_info);
365 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
366 vlan_vid_del(dev, vid_info->vid);
368 EXPORT_SYMBOL(vlan_vids_del_by_dev);
370 bool vlan_uses_dev(const struct net_device *dev)
372 struct vlan_info *vlan_info;
376 vlan_info = rtnl_dereference(dev->vlan_info);
379 return vlan_info->grp.nr_vlan_devs ? true : false;
381 EXPORT_SYMBOL(vlan_uses_dev);