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);
41 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
43 struct ifla_vlan_flags *flags;
47 if (tb[IFLA_ADDRESS]) {
48 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
50 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
51 return -EADDRNOTAVAIL;
57 if (data[IFLA_VLAN_PROTOCOL]) {
58 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
59 case htons(ETH_P_8021Q):
60 case htons(ETH_P_8021AD):
63 return -EPROTONOSUPPORT;
67 if (data[IFLA_VLAN_ID]) {
68 id = nla_get_u16(data[IFLA_VLAN_ID]);
69 if (id >= VLAN_VID_MASK)
72 if (data[IFLA_VLAN_FLAGS]) {
73 flags = nla_data(data[IFLA_VLAN_FLAGS]);
74 if ((flags->flags & flags->mask) &
75 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
76 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
80 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
83 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
89 static int vlan_changelink(struct net_device *dev,
90 struct nlattr *tb[], struct nlattr *data[])
92 struct ifla_vlan_flags *flags;
93 struct ifla_vlan_qos_mapping *m;
97 if (data[IFLA_VLAN_FLAGS]) {
98 flags = nla_data(data[IFLA_VLAN_FLAGS]);
99 err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
103 if (data[IFLA_VLAN_INGRESS_QOS]) {
104 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
106 vlan_dev_set_ingress_priority(dev, m->to, m->from);
109 if (data[IFLA_VLAN_EGRESS_QOS]) {
110 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
112 err = vlan_dev_set_egress_priority(dev, m->from, m->to);
120 static int vlan_newlink(struct net *src_net, struct net_device *dev,
121 struct nlattr *tb[], struct nlattr *data[])
123 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
124 struct net_device *real_dev;
128 if (!data[IFLA_VLAN_ID])
133 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
137 if (data[IFLA_VLAN_PROTOCOL])
138 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
140 proto = htons(ETH_P_8021Q);
142 vlan->vlan_proto = proto;
143 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
144 vlan->real_dev = real_dev;
145 vlan->flags = VLAN_FLAG_REORDER_HDR;
147 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
152 dev->mtu = real_dev->mtu;
153 else if (dev->mtu > real_dev->mtu)
156 err = vlan_changelink(dev, tb, data);
158 err = register_vlan_dev(dev);
160 vlan_dev_uninit(dev);
164 static inline size_t vlan_qos_map_size(unsigned int n)
168 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
169 return nla_total_size(sizeof(struct nlattr)) +
170 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
173 static size_t vlan_get_size(const struct net_device *dev)
175 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
177 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
178 nla_total_size(2) + /* IFLA_VLAN_ID */
179 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
180 vlan_qos_map_size(vlan->nr_ingress_mappings) +
181 vlan_qos_map_size(vlan->nr_egress_mappings);
184 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
186 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
187 struct vlan_priority_tci_mapping *pm;
188 struct ifla_vlan_flags f;
189 struct ifla_vlan_qos_mapping m;
193 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
194 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
195 goto nla_put_failure;
197 f.flags = vlan->flags;
199 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
200 goto nla_put_failure;
202 if (vlan->nr_ingress_mappings) {
203 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
205 goto nla_put_failure;
207 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
208 if (!vlan->ingress_priority_map[i])
212 m.to = vlan->ingress_priority_map[i];
213 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
215 goto nla_put_failure;
217 nla_nest_end(skb, nest);
220 if (vlan->nr_egress_mappings) {
221 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
223 goto nla_put_failure;
225 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
226 for (pm = vlan->egress_priority_map[i]; pm;
231 m.from = pm->priority;
232 m.to = (pm->vlan_qos >> 13) & 0x7;
233 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
235 goto nla_put_failure;
238 nla_nest_end(skb, nest);
246 static struct net *vlan_get_link_net(const struct net_device *dev)
248 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
250 return dev_net(real_dev);
253 struct rtnl_link_ops vlan_link_ops __read_mostly = {
255 .maxtype = IFLA_VLAN_MAX,
256 .policy = vlan_policy,
257 .priv_size = sizeof(struct vlan_dev_priv),
259 .validate = vlan_validate,
260 .newlink = vlan_newlink,
261 .changelink = vlan_changelink,
262 .dellink = unregister_vlan_dev,
263 .get_size = vlan_get_size,
264 .fill_info = vlan_fill_info,
265 .get_link_net = vlan_get_link_net,
268 int __init vlan_netlink_init(void)
270 return rtnl_link_register(&vlan_link_ops);
273 void __exit vlan_netlink_fini(void)
275 rtnl_link_unregister(&vlan_link_ops);
278 MODULE_ALIAS_RTNL_LINK("vlan");