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 = vlan_tx_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);
25 if (skb->pkt_type == PACKET_OTHERHOST) {
26 /* Our lower layer thinks this is not local, let's make sure.
27 * This allows the VLAN to have a different MAC than the
28 * underlying device, and still route correctly. */
29 if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
30 skb->pkt_type = PACKET_HOST;
33 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
34 unsigned int offset = skb->data - skb_mac_header(skb);
37 * vlan_insert_tag expect skb->data pointing to mac header.
38 * So change skb->data before calling it and change back to
39 * original position later
41 skb_push(skb, offset);
42 skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto,
46 skb_pull(skb, offset + VLAN_HLEN);
47 skb_reset_mac_len(skb);
50 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
53 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
55 u64_stats_update_begin(&rx_stats->syncp);
56 rx_stats->rx_packets++;
57 rx_stats->rx_bytes += skb->len;
58 if (skb->pkt_type == PACKET_MULTICAST)
59 rx_stats->rx_multicast++;
60 u64_stats_update_end(&rx_stats->syncp);
65 /* Must be invoked with rcu_read_lock. */
66 struct net_device *__vlan_find_dev_deep(struct net_device *dev,
67 __be16 vlan_proto, u16 vlan_id)
69 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
72 return vlan_group_get_device(&vlan_info->grp,
76 * Lower devices of master uppers (bonding, team) do not have
77 * grp assigned to themselves. Grp is assigned to upper device
80 struct net_device *upper_dev;
82 upper_dev = netdev_master_upper_dev_get_rcu(dev);
84 return __vlan_find_dev_deep(upper_dev,
90 EXPORT_SYMBOL(__vlan_find_dev_deep);
92 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
94 return vlan_dev_priv(dev)->real_dev;
96 EXPORT_SYMBOL(vlan_dev_real_dev);
98 u16 vlan_dev_vlan_id(const struct net_device *dev)
100 return vlan_dev_priv(dev)->vlan_id;
102 EXPORT_SYMBOL(vlan_dev_vlan_id);
104 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
106 if (skb_cow(skb, skb_headroom(skb)) < 0) {
111 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
112 skb->mac_header += VLAN_HLEN;
116 struct sk_buff *vlan_untag(struct sk_buff *skb)
118 struct vlan_hdr *vhdr;
121 if (unlikely(vlan_tx_tag_present(skb))) {
122 /* vlan_tci is already set-up so leave this for another time */
126 skb = skb_share_check(skb, GFP_ATOMIC);
130 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
133 vhdr = (struct vlan_hdr *) skb->data;
134 vlan_tci = ntohs(vhdr->h_vlan_TCI);
135 __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci);
137 skb_pull_rcsum(skb, VLAN_HLEN);
138 vlan_set_encap_proto(skb, vhdr);
140 skb = vlan_reorder_header(skb);
144 skb_reset_network_header(skb);
145 skb_reset_transport_header(skb);
146 skb_reset_mac_len(skb);
154 EXPORT_SYMBOL(vlan_untag);
158 * vlan info and vid list
161 static void vlan_group_free(struct vlan_group *grp)
165 for (i = 0; i < VLAN_PROTO_NUM; i++)
166 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
167 kfree(grp->vlan_devices_arrays[i][j]);
170 static void vlan_info_free(struct vlan_info *vlan_info)
172 vlan_group_free(&vlan_info->grp);
176 static void vlan_info_rcu_free(struct rcu_head *rcu)
178 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
181 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
183 struct vlan_info *vlan_info;
185 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
189 vlan_info->real_dev = dev;
190 INIT_LIST_HEAD(&vlan_info->vid_list);
194 struct vlan_vid_info {
195 struct list_head list;
201 static bool vlan_hw_filter_capable(const struct net_device *dev,
202 const struct vlan_vid_info *vid_info)
204 if (vid_info->proto == htons(ETH_P_8021Q) &&
205 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
207 if (vid_info->proto == htons(ETH_P_8021AD) &&
208 dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
213 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
214 __be16 proto, u16 vid)
216 struct vlan_vid_info *vid_info;
218 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
219 if (vid_info->proto == proto && vid_info->vid == vid)
225 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
227 struct vlan_vid_info *vid_info;
229 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
232 vid_info->proto = proto;
238 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
239 struct vlan_vid_info **pvid_info)
241 struct net_device *dev = vlan_info->real_dev;
242 const struct net_device_ops *ops = dev->netdev_ops;
243 struct vlan_vid_info *vid_info;
246 vid_info = vlan_vid_info_alloc(proto, vid);
250 if (vlan_hw_filter_capable(dev, vid_info)) {
251 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid);
257 list_add(&vid_info->list, &vlan_info->vid_list);
258 vlan_info->nr_vids++;
259 *pvid_info = vid_info;
263 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
265 struct vlan_info *vlan_info;
266 struct vlan_vid_info *vid_info;
267 bool vlan_info_created = false;
272 vlan_info = rtnl_dereference(dev->vlan_info);
274 vlan_info = vlan_info_alloc(dev);
277 vlan_info_created = true;
279 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
281 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
283 goto out_free_vlan_info;
285 vid_info->refcount++;
287 if (vlan_info_created)
288 rcu_assign_pointer(dev->vlan_info, vlan_info);
293 if (vlan_info_created)
297 EXPORT_SYMBOL(vlan_vid_add);
299 static void __vlan_vid_del(struct vlan_info *vlan_info,
300 struct vlan_vid_info *vid_info)
302 struct net_device *dev = vlan_info->real_dev;
303 const struct net_device_ops *ops = dev->netdev_ops;
304 __be16 proto = vid_info->proto;
305 u16 vid = vid_info->vid;
308 if (vlan_hw_filter_capable(dev, vid_info)) {
309 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
311 pr_warn("failed to kill vid %04x/%d for device %s\n",
312 proto, vid, dev->name);
315 list_del(&vid_info->list);
317 vlan_info->nr_vids--;
320 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
322 struct vlan_info *vlan_info;
323 struct vlan_vid_info *vid_info;
327 vlan_info = rtnl_dereference(dev->vlan_info);
331 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
334 vid_info->refcount--;
335 if (vid_info->refcount == 0) {
336 __vlan_vid_del(vlan_info, vid_info);
337 if (vlan_info->nr_vids == 0) {
338 RCU_INIT_POINTER(dev->vlan_info, NULL);
339 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
343 EXPORT_SYMBOL(vlan_vid_del);
345 int vlan_vids_add_by_dev(struct net_device *dev,
346 const struct net_device *by_dev)
348 struct vlan_vid_info *vid_info;
349 struct vlan_info *vlan_info;
354 vlan_info = rtnl_dereference(by_dev->vlan_info);
358 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
359 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
366 list_for_each_entry_continue_reverse(vid_info,
367 &vlan_info->vid_list,
369 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
374 EXPORT_SYMBOL(vlan_vids_add_by_dev);
376 void vlan_vids_del_by_dev(struct net_device *dev,
377 const struct net_device *by_dev)
379 struct vlan_vid_info *vid_info;
380 struct vlan_info *vlan_info;
384 vlan_info = rtnl_dereference(by_dev->vlan_info);
388 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
389 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
391 EXPORT_SYMBOL(vlan_vids_del_by_dev);
393 bool vlan_uses_dev(const struct net_device *dev)
395 struct vlan_info *vlan_info;
399 vlan_info = rtnl_dereference(dev->vlan_info);
402 return vlan_info->grp.nr_vlan_devs ? true : false;
404 EXPORT_SYMBOL(vlan_uses_dev);