2 * VLAN netlink control interface
4 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/netdevice.h>
13 #include <linux/if_vlan.h>
14 #include <linux/module.h>
15 #include <net/net_namespace.h>
16 #include <net/netlink.h>
17 #include <net/rtnetlink.h>
21 static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
22 [IFLA_VLAN_ID] = { .type = NLA_U16 },
23 [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
24 [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
25 [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
26 [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
29 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
30 [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
34 static inline int vlan_validate_qos_map(struct nlattr *attr)
38 return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy,
42 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
43 struct netlink_ext_ack *extack)
45 struct ifla_vlan_flags *flags;
49 if (tb[IFLA_ADDRESS]) {
50 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
51 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
54 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
55 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
56 return -EADDRNOTAVAIL;
61 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
65 if (data[IFLA_VLAN_PROTOCOL]) {
66 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
67 case htons(ETH_P_8021Q):
68 case htons(ETH_P_8021AD):
71 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
72 return -EPROTONOSUPPORT;
76 if (data[IFLA_VLAN_ID]) {
77 id = nla_get_u16(data[IFLA_VLAN_ID]);
78 if (id >= VLAN_VID_MASK) {
79 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id");
83 if (data[IFLA_VLAN_FLAGS]) {
84 flags = nla_data(data[IFLA_VLAN_FLAGS]);
85 if ((flags->flags & flags->mask) &
86 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
87 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) {
88 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
93 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
95 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
98 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
100 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
106 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
107 struct nlattr *data[],
108 struct netlink_ext_ack *extack)
110 struct ifla_vlan_flags *flags;
111 struct ifla_vlan_qos_mapping *m;
115 if (data[IFLA_VLAN_FLAGS]) {
116 flags = nla_data(data[IFLA_VLAN_FLAGS]);
117 err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
121 if (data[IFLA_VLAN_INGRESS_QOS]) {
122 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
124 vlan_dev_set_ingress_priority(dev, m->to, m->from);
127 if (data[IFLA_VLAN_EGRESS_QOS]) {
128 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
130 err = vlan_dev_set_egress_priority(dev, m->from, m->to);
138 static int vlan_newlink(struct net *src_net, struct net_device *dev,
139 struct nlattr *tb[], struct nlattr *data[],
140 struct netlink_ext_ack *extack)
142 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
143 struct net_device *real_dev;
144 unsigned int max_mtu;
148 if (!data[IFLA_VLAN_ID]) {
149 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
153 if (!tb[IFLA_LINK]) {
154 NL_SET_ERR_MSG_MOD(extack, "link not specified");
158 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
160 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
164 if (data[IFLA_VLAN_PROTOCOL])
165 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
167 proto = htons(ETH_P_8021Q);
169 vlan->vlan_proto = proto;
170 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
171 vlan->real_dev = real_dev;
172 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
173 vlan->flags = VLAN_FLAG_REORDER_HDR;
175 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
180 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
184 else if (dev->mtu > max_mtu)
187 err = vlan_changelink(dev, tb, data, extack);
189 err = register_vlan_dev(dev, extack);
191 vlan_dev_uninit(dev);
195 static inline size_t vlan_qos_map_size(unsigned int n)
199 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
200 return nla_total_size(sizeof(struct nlattr)) +
201 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
204 static size_t vlan_get_size(const struct net_device *dev)
206 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
208 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
209 nla_total_size(2) + /* IFLA_VLAN_ID */
210 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
211 vlan_qos_map_size(vlan->nr_ingress_mappings) +
212 vlan_qos_map_size(vlan->nr_egress_mappings);
215 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
217 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
218 struct vlan_priority_tci_mapping *pm;
219 struct ifla_vlan_flags f;
220 struct ifla_vlan_qos_mapping m;
224 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
225 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
226 goto nla_put_failure;
228 f.flags = vlan->flags;
230 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
231 goto nla_put_failure;
233 if (vlan->nr_ingress_mappings) {
234 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
236 goto nla_put_failure;
238 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
239 if (!vlan->ingress_priority_map[i])
243 m.to = vlan->ingress_priority_map[i];
244 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
246 goto nla_put_failure;
248 nla_nest_end(skb, nest);
251 if (vlan->nr_egress_mappings) {
252 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
254 goto nla_put_failure;
256 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
257 for (pm = vlan->egress_priority_map[i]; pm;
262 m.from = pm->priority;
263 m.to = (pm->vlan_qos >> 13) & 0x7;
264 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
266 goto nla_put_failure;
269 nla_nest_end(skb, nest);
277 static struct net *vlan_get_link_net(const struct net_device *dev)
279 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
281 return dev_net(real_dev);
284 struct rtnl_link_ops vlan_link_ops __read_mostly = {
286 .maxtype = IFLA_VLAN_MAX,
287 .policy = vlan_policy,
288 .priv_size = sizeof(struct vlan_dev_priv),
290 .validate = vlan_validate,
291 .newlink = vlan_newlink,
292 .changelink = vlan_changelink,
293 .dellink = unregister_vlan_dev,
294 .get_size = vlan_get_size,
295 .fill_info = vlan_fill_info,
296 .get_link_net = vlan_get_link_net,
299 int __init vlan_netlink_init(void)
301 return rtnl_link_register(&vlan_link_ops);
304 void __exit vlan_netlink_fini(void)
306 rtnl_link_unregister(&vlan_link_ops);
309 MODULE_ALIAS_RTNL_LINK("vlan");