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 struct net_device *ret = vlan_dev_priv(dev)->real_dev;
96 while (is_vlan_dev(ret))
97 ret = vlan_dev_priv(ret)->real_dev;
101 EXPORT_SYMBOL(vlan_dev_real_dev);
103 u16 vlan_dev_vlan_id(const struct net_device *dev)
105 return vlan_dev_priv(dev)->vlan_id;
107 EXPORT_SYMBOL(vlan_dev_vlan_id);
109 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
111 if (skb_cow(skb, skb_headroom(skb)) < 0)
113 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
114 skb->mac_header += VLAN_HLEN;
118 struct sk_buff *vlan_untag(struct sk_buff *skb)
120 struct vlan_hdr *vhdr;
123 if (unlikely(vlan_tx_tag_present(skb))) {
124 /* vlan_tci is already set-up so leave this for another time */
128 skb = skb_share_check(skb, GFP_ATOMIC);
132 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
135 vhdr = (struct vlan_hdr *) skb->data;
136 vlan_tci = ntohs(vhdr->h_vlan_TCI);
137 __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci);
139 skb_pull_rcsum(skb, VLAN_HLEN);
140 vlan_set_encap_proto(skb, vhdr);
142 skb = vlan_reorder_header(skb);
146 skb_reset_network_header(skb);
147 skb_reset_transport_header(skb);
148 skb_reset_mac_len(skb);
156 EXPORT_SYMBOL(vlan_untag);
160 * vlan info and vid list
163 static void vlan_group_free(struct vlan_group *grp)
167 for (i = 0; i < VLAN_PROTO_NUM; i++)
168 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
169 kfree(grp->vlan_devices_arrays[i][j]);
172 static void vlan_info_free(struct vlan_info *vlan_info)
174 vlan_group_free(&vlan_info->grp);
178 static void vlan_info_rcu_free(struct rcu_head *rcu)
180 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
183 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
185 struct vlan_info *vlan_info;
187 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
191 vlan_info->real_dev = dev;
192 INIT_LIST_HEAD(&vlan_info->vid_list);
196 struct vlan_vid_info {
197 struct list_head list;
203 static bool vlan_hw_filter_capable(const struct net_device *dev,
204 const struct vlan_vid_info *vid_info)
206 if (vid_info->proto == htons(ETH_P_8021Q) &&
207 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
209 if (vid_info->proto == htons(ETH_P_8021AD) &&
210 dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
215 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
216 __be16 proto, u16 vid)
218 struct vlan_vid_info *vid_info;
220 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
221 if (vid_info->proto == proto && vid_info->vid == vid)
227 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
229 struct vlan_vid_info *vid_info;
231 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
234 vid_info->proto = proto;
240 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
241 struct vlan_vid_info **pvid_info)
243 struct net_device *dev = vlan_info->real_dev;
244 const struct net_device_ops *ops = dev->netdev_ops;
245 struct vlan_vid_info *vid_info;
248 vid_info = vlan_vid_info_alloc(proto, vid);
252 if (vlan_hw_filter_capable(dev, vid_info)) {
253 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid);
259 list_add(&vid_info->list, &vlan_info->vid_list);
260 vlan_info->nr_vids++;
261 *pvid_info = vid_info;
265 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
267 struct vlan_info *vlan_info;
268 struct vlan_vid_info *vid_info;
269 bool vlan_info_created = false;
274 vlan_info = rtnl_dereference(dev->vlan_info);
276 vlan_info = vlan_info_alloc(dev);
279 vlan_info_created = true;
281 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
283 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
285 goto out_free_vlan_info;
287 vid_info->refcount++;
289 if (vlan_info_created)
290 rcu_assign_pointer(dev->vlan_info, vlan_info);
295 if (vlan_info_created)
299 EXPORT_SYMBOL(vlan_vid_add);
301 static void __vlan_vid_del(struct vlan_info *vlan_info,
302 struct vlan_vid_info *vid_info)
304 struct net_device *dev = vlan_info->real_dev;
305 const struct net_device_ops *ops = dev->netdev_ops;
306 __be16 proto = vid_info->proto;
307 u16 vid = vid_info->vid;
310 if (vlan_hw_filter_capable(dev, vid_info)) {
311 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
313 pr_warn("failed to kill vid %04x/%d for device %s\n",
314 proto, vid, dev->name);
317 list_del(&vid_info->list);
319 vlan_info->nr_vids--;
322 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
324 struct vlan_info *vlan_info;
325 struct vlan_vid_info *vid_info;
329 vlan_info = rtnl_dereference(dev->vlan_info);
333 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
336 vid_info->refcount--;
337 if (vid_info->refcount == 0) {
338 __vlan_vid_del(vlan_info, vid_info);
339 if (vlan_info->nr_vids == 0) {
340 RCU_INIT_POINTER(dev->vlan_info, NULL);
341 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
345 EXPORT_SYMBOL(vlan_vid_del);
347 int vlan_vids_add_by_dev(struct net_device *dev,
348 const struct net_device *by_dev)
350 struct vlan_vid_info *vid_info;
351 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 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
368 list_for_each_entry_continue_reverse(vid_info,
369 &vlan_info->vid_list,
371 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
376 EXPORT_SYMBOL(vlan_vids_add_by_dev);
378 void vlan_vids_del_by_dev(struct net_device *dev,
379 const struct net_device *by_dev)
381 struct vlan_vid_info *vid_info;
382 struct vlan_info *vlan_info;
386 vlan_info = rtnl_dereference(by_dev->vlan_info);
390 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
391 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
393 EXPORT_SYMBOL(vlan_vids_del_by_dev);
395 bool vlan_uses_dev(const struct net_device *dev)
397 struct vlan_info *vlan_info;
401 vlan_info = rtnl_dereference(dev->vlan_info);
404 return vlan_info->grp.nr_vlan_devs ? true : false;
406 EXPORT_SYMBOL(vlan_uses_dev);