Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / 8021q / vlan_core.c
blob64aa9f755e1d251e19f1b713acfc163318a9b57d
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>
7 #include "vlan.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);
18 if (!vlan_dev)
19 return false;
21 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
22 if (unlikely(!skb))
23 return false;
25 if (unlikely(!(vlan_dev->flags & IFF_UP))) {
26 kfree_skb(skb);
27 *skbp = NULL;
28 return false;
31 skb->dev = vlan_dev;
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_tag(skb, skb->vlan_proto,
52 skb->vlan_tci);
53 if (!skb)
54 return false;
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);
60 skb->vlan_tci = 0;
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);
71 return true;
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);
80 if (vlan_info) {
81 return vlan_group_get_device(&vlan_info->grp,
82 vlan_proto, vlan_id);
83 } else {
85 * Lower devices of master uppers (bonding, team) do not have
86 * grp assigned to themselves. Grp is assigned to upper device
87 * instead.
89 struct net_device *upper_dev;
91 upper_dev = netdev_master_upper_dev_get_rcu(dev);
92 if (upper_dev)
93 return __vlan_find_dev_deep_rcu(upper_dev,
94 vlan_proto, vlan_id);
97 return NULL;
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;
108 return ret;
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)
130 int i, j;
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);
140 kfree(vlan_info);
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);
153 if (!vlan_info)
154 return NULL;
156 vlan_info->real_dev = dev;
157 INIT_LIST_HEAD(&vlan_info->vid_list);
158 return vlan_info;
161 struct vlan_vid_info {
162 struct list_head list;
163 __be16 proto;
164 u16 vid;
165 int refcount;
168 static bool vlan_hw_filter_capable(const struct net_device *dev,
169 const struct vlan_vid_info *vid_info)
171 if (vid_info->proto == htons(ETH_P_8021Q) &&
172 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
173 return true;
174 if (vid_info->proto == htons(ETH_P_8021AD) &&
175 dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
176 return true;
177 return false;
180 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
181 __be16 proto, u16 vid)
183 struct vlan_vid_info *vid_info;
185 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
186 if (vid_info->proto == proto && vid_info->vid == vid)
187 return vid_info;
189 return NULL;
192 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
194 struct vlan_vid_info *vid_info;
196 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
197 if (!vid_info)
198 return NULL;
199 vid_info->proto = proto;
200 vid_info->vid = vid;
202 return vid_info;
205 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
206 struct vlan_vid_info **pvid_info)
208 struct net_device *dev = vlan_info->real_dev;
209 const struct net_device_ops *ops = dev->netdev_ops;
210 struct vlan_vid_info *vid_info;
211 int err;
213 vid_info = vlan_vid_info_alloc(proto, vid);
214 if (!vid_info)
215 return -ENOMEM;
217 if (vlan_hw_filter_capable(dev, vid_info)) {
218 if (netif_device_present(dev))
219 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid);
220 else
221 err = -ENODEV;
222 if (err) {
223 kfree(vid_info);
224 return err;
227 list_add(&vid_info->list, &vlan_info->vid_list);
228 vlan_info->nr_vids++;
229 *pvid_info = vid_info;
230 return 0;
233 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
235 struct vlan_info *vlan_info;
236 struct vlan_vid_info *vid_info;
237 bool vlan_info_created = false;
238 int err;
240 ASSERT_RTNL();
242 vlan_info = rtnl_dereference(dev->vlan_info);
243 if (!vlan_info) {
244 vlan_info = vlan_info_alloc(dev);
245 if (!vlan_info)
246 return -ENOMEM;
247 vlan_info_created = true;
249 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
250 if (!vid_info) {
251 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
252 if (err)
253 goto out_free_vlan_info;
255 vid_info->refcount++;
257 if (vlan_info_created)
258 rcu_assign_pointer(dev->vlan_info, vlan_info);
260 return 0;
262 out_free_vlan_info:
263 if (vlan_info_created)
264 kfree(vlan_info);
265 return err;
267 EXPORT_SYMBOL(vlan_vid_add);
269 static void __vlan_vid_del(struct vlan_info *vlan_info,
270 struct vlan_vid_info *vid_info)
272 struct net_device *dev = vlan_info->real_dev;
273 const struct net_device_ops *ops = dev->netdev_ops;
274 __be16 proto = vid_info->proto;
275 u16 vid = vid_info->vid;
276 int err;
278 if (vlan_hw_filter_capable(dev, vid_info)) {
279 if (netif_device_present(dev))
280 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
281 else
282 err = -ENODEV;
283 if (err) {
284 pr_warn("failed to kill vid %04x/%d for device %s\n",
285 proto, vid, dev->name);
288 list_del(&vid_info->list);
289 kfree(vid_info);
290 vlan_info->nr_vids--;
293 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
295 struct vlan_info *vlan_info;
296 struct vlan_vid_info *vid_info;
298 ASSERT_RTNL();
300 vlan_info = rtnl_dereference(dev->vlan_info);
301 if (!vlan_info)
302 return;
304 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
305 if (!vid_info)
306 return;
307 vid_info->refcount--;
308 if (vid_info->refcount == 0) {
309 __vlan_vid_del(vlan_info, vid_info);
310 if (vlan_info->nr_vids == 0) {
311 RCU_INIT_POINTER(dev->vlan_info, NULL);
312 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
316 EXPORT_SYMBOL(vlan_vid_del);
318 int vlan_vids_add_by_dev(struct net_device *dev,
319 const struct net_device *by_dev)
321 struct vlan_vid_info *vid_info;
322 struct vlan_info *vlan_info;
323 int err;
325 ASSERT_RTNL();
327 vlan_info = rtnl_dereference(by_dev->vlan_info);
328 if (!vlan_info)
329 return 0;
331 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
332 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
333 if (err)
334 goto unwind;
336 return 0;
338 unwind:
339 list_for_each_entry_continue_reverse(vid_info,
340 &vlan_info->vid_list,
341 list) {
342 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
345 return err;
347 EXPORT_SYMBOL(vlan_vids_add_by_dev);
349 void vlan_vids_del_by_dev(struct net_device *dev,
350 const struct net_device *by_dev)
352 struct vlan_vid_info *vid_info;
353 struct vlan_info *vlan_info;
355 ASSERT_RTNL();
357 vlan_info = rtnl_dereference(by_dev->vlan_info);
358 if (!vlan_info)
359 return;
361 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
362 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
364 EXPORT_SYMBOL(vlan_vids_del_by_dev);
366 bool vlan_uses_dev(const struct net_device *dev)
368 struct vlan_info *vlan_info;
370 ASSERT_RTNL();
372 vlan_info = rtnl_dereference(dev->vlan_info);
373 if (!vlan_info)
374 return false;
375 return vlan_info->grp.nr_vlan_devs ? true : false;
377 EXPORT_SYMBOL(vlan_uses_dev);