1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/skbuff.h>
3 #include <linux/netdevice.h>
4 #include <linux/if_vlan.h>
5 #include <linux/netpoll.h>
6 #include <linux/export.h>
9 bool vlan_do_receive(struct sk_buff **skbp)
11 struct sk_buff *skb = *skbp;
12 __be16 vlan_proto = skb->vlan_proto;
13 u16 vlan_id = skb_vlan_tag_get_id(skb);
14 struct net_device *vlan_dev;
15 struct vlan_pcpu_stats *rx_stats;
17 vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id);
21 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
25 if (unlikely(!(vlan_dev->flags & IFF_UP))) {
32 if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
33 /* Our lower layer thinks this is not local, let's make sure.
34 * This allows the VLAN to have a different MAC than the
35 * underlying device, and still route correctly. */
36 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
37 skb->pkt_type = PACKET_HOST;
40 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR) &&
41 !netif_is_macvlan_port(vlan_dev) &&
42 !netif_is_bridge_port(vlan_dev)) {
43 unsigned int offset = skb->data - skb_mac_header(skb);
46 * vlan_insert_tag expect skb->data pointing to mac header.
47 * So change skb->data before calling it and change back to
48 * original position later
50 skb_push(skb, offset);
51 skb = *skbp = vlan_insert_inner_tag(skb, skb->vlan_proto,
52 skb->vlan_tci, skb->mac_len);
55 skb_pull(skb, offset + VLAN_HLEN);
56 skb_reset_mac_len(skb);
59 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
62 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
64 u64_stats_update_begin(&rx_stats->syncp);
65 rx_stats->rx_packets++;
66 rx_stats->rx_bytes += skb->len;
67 if (skb->pkt_type == PACKET_MULTICAST)
68 rx_stats->rx_multicast++;
69 u64_stats_update_end(&rx_stats->syncp);
74 /* Must be invoked with rcu_read_lock. */
75 struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev,
76 __be16 vlan_proto, u16 vlan_id)
78 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
81 return vlan_group_get_device(&vlan_info->grp,
85 * Lower devices of master uppers (bonding, team) do not have
86 * grp assigned to themselves. Grp is assigned to upper device
89 struct net_device *upper_dev;
91 upper_dev = netdev_master_upper_dev_get_rcu(dev);
93 return __vlan_find_dev_deep_rcu(upper_dev,
99 EXPORT_SYMBOL(__vlan_find_dev_deep_rcu);
101 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
103 struct net_device *ret = vlan_dev_priv(dev)->real_dev;
105 while (is_vlan_dev(ret))
106 ret = vlan_dev_priv(ret)->real_dev;
110 EXPORT_SYMBOL(vlan_dev_real_dev);
112 u16 vlan_dev_vlan_id(const struct net_device *dev)
114 return vlan_dev_priv(dev)->vlan_id;
116 EXPORT_SYMBOL(vlan_dev_vlan_id);
118 __be16 vlan_dev_vlan_proto(const struct net_device *dev)
120 return vlan_dev_priv(dev)->vlan_proto;
122 EXPORT_SYMBOL(vlan_dev_vlan_proto);
125 * vlan info and vid list
128 static void vlan_group_free(struct vlan_group *grp)
132 for (i = 0; i < VLAN_PROTO_NUM; i++)
133 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
134 kfree(grp->vlan_devices_arrays[i][j]);
137 static void vlan_info_free(struct vlan_info *vlan_info)
139 vlan_group_free(&vlan_info->grp);
143 static void vlan_info_rcu_free(struct rcu_head *rcu)
145 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
148 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
150 struct vlan_info *vlan_info;
152 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
156 vlan_info->real_dev = dev;
157 INIT_LIST_HEAD(&vlan_info->vid_list);
161 struct vlan_vid_info {
162 struct list_head list;
168 static bool vlan_hw_filter_capable(const struct net_device *dev, __be16 proto)
170 if (proto == htons(ETH_P_8021Q) &&
171 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
173 if (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_add_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid)
206 if (!vlan_hw_filter_capable(dev, proto))
209 if (netif_device_present(dev))
210 return dev->netdev_ops->ndo_vlan_rx_add_vid(dev, proto, vid);
215 static int vlan_kill_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid)
217 if (!vlan_hw_filter_capable(dev, proto))
220 if (netif_device_present(dev))
221 return dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
226 int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto)
228 struct net_device *real_dev = vlan_info->real_dev;
229 struct vlan_vid_info *vlan_vid_info;
232 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) {
233 if (vlan_vid_info->proto == proto) {
234 err = vlan_add_rx_filter_info(real_dev, proto,
244 list_for_each_entry_continue_reverse(vlan_vid_info,
245 &vlan_info->vid_list, list) {
246 if (vlan_vid_info->proto == proto)
247 vlan_kill_rx_filter_info(real_dev, proto,
253 EXPORT_SYMBOL(vlan_filter_push_vids);
255 void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto)
257 struct vlan_vid_info *vlan_vid_info;
259 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list)
260 if (vlan_vid_info->proto == proto)
261 vlan_kill_rx_filter_info(vlan_info->real_dev,
262 vlan_vid_info->proto,
265 EXPORT_SYMBOL(vlan_filter_drop_vids);
267 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
268 struct vlan_vid_info **pvid_info)
270 struct net_device *dev = vlan_info->real_dev;
271 struct vlan_vid_info *vid_info;
274 vid_info = vlan_vid_info_alloc(proto, vid);
278 err = vlan_add_rx_filter_info(dev, proto, vid);
284 list_add(&vid_info->list, &vlan_info->vid_list);
285 vlan_info->nr_vids++;
286 *pvid_info = vid_info;
290 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
292 struct vlan_info *vlan_info;
293 struct vlan_vid_info *vid_info;
294 bool vlan_info_created = false;
299 vlan_info = rtnl_dereference(dev->vlan_info);
301 vlan_info = vlan_info_alloc(dev);
304 vlan_info_created = true;
306 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
308 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
310 goto out_free_vlan_info;
312 vid_info->refcount++;
314 if (vlan_info_created)
315 rcu_assign_pointer(dev->vlan_info, vlan_info);
320 if (vlan_info_created)
324 EXPORT_SYMBOL(vlan_vid_add);
326 static void __vlan_vid_del(struct vlan_info *vlan_info,
327 struct vlan_vid_info *vid_info)
329 struct net_device *dev = vlan_info->real_dev;
330 __be16 proto = vid_info->proto;
331 u16 vid = vid_info->vid;
334 err = vlan_kill_rx_filter_info(dev, proto, vid);
336 pr_warn("failed to kill vid %04x/%d for device %s\n",
337 proto, vid, dev->name);
339 list_del(&vid_info->list);
341 vlan_info->nr_vids--;
344 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
346 struct vlan_info *vlan_info;
347 struct vlan_vid_info *vid_info;
351 vlan_info = rtnl_dereference(dev->vlan_info);
355 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
358 vid_info->refcount--;
359 if (vid_info->refcount == 0) {
360 __vlan_vid_del(vlan_info, vid_info);
361 if (vlan_info->nr_vids == 0) {
362 RCU_INIT_POINTER(dev->vlan_info, NULL);
363 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
367 EXPORT_SYMBOL(vlan_vid_del);
369 int vlan_vids_add_by_dev(struct net_device *dev,
370 const struct net_device *by_dev)
372 struct vlan_vid_info *vid_info;
373 struct vlan_info *vlan_info;
378 vlan_info = rtnl_dereference(by_dev->vlan_info);
382 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
383 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
390 list_for_each_entry_continue_reverse(vid_info,
391 &vlan_info->vid_list,
393 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
398 EXPORT_SYMBOL(vlan_vids_add_by_dev);
400 void vlan_vids_del_by_dev(struct net_device *dev,
401 const struct net_device *by_dev)
403 struct vlan_vid_info *vid_info;
404 struct vlan_info *vlan_info;
408 vlan_info = rtnl_dereference(by_dev->vlan_info);
412 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
413 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
415 EXPORT_SYMBOL(vlan_vids_del_by_dev);
417 bool vlan_uses_dev(const struct net_device *dev)
419 struct vlan_info *vlan_info;
423 vlan_info = rtnl_dereference(dev->vlan_info);
426 return vlan_info->grp.nr_vlan_devs ? true : false;
428 EXPORT_SYMBOL(vlan_uses_dev);