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[])
44 struct ifla_vlan_flags *flags;
48 if (tb[IFLA_ADDRESS]) {
49 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
51 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
52 return -EADDRNOTAVAIL;
58 if (data[IFLA_VLAN_PROTOCOL]) {
59 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
60 case htons(ETH_P_8021Q):
61 case htons(ETH_P_8021AD):
64 return -EPROTONOSUPPORT;
68 if (data[IFLA_VLAN_ID]) {
69 id = nla_get_u16(data[IFLA_VLAN_ID]);
70 if (id >= VLAN_VID_MASK)
73 if (data[IFLA_VLAN_FLAGS]) {
74 flags = nla_data(data[IFLA_VLAN_FLAGS]);
75 if ((flags->flags & flags->mask) &
76 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
77 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
81 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
84 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
90 static int vlan_changelink(struct net_device *dev,
91 struct nlattr *tb[], struct nlattr *data[])
93 struct ifla_vlan_flags *flags;
94 struct ifla_vlan_qos_mapping *m;
98 if (data[IFLA_VLAN_FLAGS]) {
99 flags = nla_data(data[IFLA_VLAN_FLAGS]);
100 vlan_dev_change_flags(dev, flags->flags, flags->mask);
102 if (data[IFLA_VLAN_INGRESS_QOS]) {
103 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
105 vlan_dev_set_ingress_priority(dev, m->to, m->from);
108 if (data[IFLA_VLAN_EGRESS_QOS]) {
109 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
111 vlan_dev_set_egress_priority(dev, m->from, m->to);
117 static int vlan_newlink(struct net *src_net, struct net_device *dev,
118 struct nlattr *tb[], struct nlattr *data[])
120 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
121 struct net_device *real_dev;
122 unsigned int max_mtu;
126 if (!data[IFLA_VLAN_ID])
131 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
135 if (data[IFLA_VLAN_PROTOCOL])
136 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
138 proto = htons(ETH_P_8021Q);
140 vlan->vlan_proto = proto;
141 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
142 vlan->real_dev = real_dev;
143 vlan->flags = VLAN_FLAG_REORDER_HDR;
145 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
149 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
153 else if (dev->mtu > max_mtu)
156 err = vlan_changelink(dev, tb, data);
160 return register_vlan_dev(dev);
163 static inline size_t vlan_qos_map_size(unsigned int n)
167 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
168 return nla_total_size(sizeof(struct nlattr)) +
169 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
172 static size_t vlan_get_size(const struct net_device *dev)
174 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
176 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
177 nla_total_size(2) + /* IFLA_VLAN_ID */
178 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
179 vlan_qos_map_size(vlan->nr_ingress_mappings) +
180 vlan_qos_map_size(vlan->nr_egress_mappings);
183 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
185 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
186 struct vlan_priority_tci_mapping *pm;
187 struct ifla_vlan_flags f;
188 struct ifla_vlan_qos_mapping m;
192 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
193 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
194 goto nla_put_failure;
196 f.flags = vlan->flags;
198 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
199 goto nla_put_failure;
201 if (vlan->nr_ingress_mappings) {
202 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
204 goto nla_put_failure;
206 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
207 if (!vlan->ingress_priority_map[i])
211 m.to = vlan->ingress_priority_map[i];
212 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
214 goto nla_put_failure;
216 nla_nest_end(skb, nest);
219 if (vlan->nr_egress_mappings) {
220 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
222 goto nla_put_failure;
224 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
225 for (pm = vlan->egress_priority_map[i]; pm;
230 m.from = pm->priority;
231 m.to = (pm->vlan_qos >> 13) & 0x7;
232 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
234 goto nla_put_failure;
237 nla_nest_end(skb, nest);
245 static struct net *vlan_get_link_net(const struct net_device *dev)
247 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
249 return dev_net(real_dev);
252 struct rtnl_link_ops vlan_link_ops __read_mostly = {
254 .maxtype = IFLA_VLAN_MAX,
255 .policy = vlan_policy,
256 .priv_size = sizeof(struct vlan_dev_priv),
258 .validate = vlan_validate,
259 .newlink = vlan_newlink,
260 .changelink = vlan_changelink,
261 .dellink = unregister_vlan_dev,
262 .get_size = vlan_get_size,
263 .fill_info = vlan_fill_info,
264 .get_link_net = vlan_get_link_net,
267 int __init vlan_netlink_init(void)
269 return rtnl_link_register(&vlan_link_ops);
272 void __exit vlan_netlink_fini(void)
274 rtnl_link_unregister(&vlan_link_ops);
277 MODULE_ALIAS_RTNL_LINK("vlan");