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_deprecated(attr, IFLA_VLAN_QOS_MAX,
39 vlan_map_policy, NULL);
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 VLAN_FLAG_BRIDGE_BINDING)) {
89 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
94 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
96 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
99 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
101 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
107 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
108 struct nlattr *data[],
109 struct netlink_ext_ack *extack)
111 struct ifla_vlan_flags *flags;
112 struct ifla_vlan_qos_mapping *m;
116 if (data[IFLA_VLAN_FLAGS]) {
117 flags = nla_data(data[IFLA_VLAN_FLAGS]);
118 vlan_dev_change_flags(dev, flags->flags, flags->mask);
120 if (data[IFLA_VLAN_INGRESS_QOS]) {
121 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
123 vlan_dev_set_ingress_priority(dev, m->to, m->from);
126 if (data[IFLA_VLAN_EGRESS_QOS]) {
127 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
129 vlan_dev_set_egress_priority(dev, m->from, m->to);
135 static int vlan_newlink(struct net *src_net, struct net_device *dev,
136 struct nlattr *tb[], struct nlattr *data[],
137 struct netlink_ext_ack *extack)
139 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
140 struct net_device *real_dev;
141 unsigned int max_mtu;
145 if (!data[IFLA_VLAN_ID]) {
146 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
150 if (!tb[IFLA_LINK]) {
151 NL_SET_ERR_MSG_MOD(extack, "link not specified");
155 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
157 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
161 if (data[IFLA_VLAN_PROTOCOL])
162 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
164 proto = htons(ETH_P_8021Q);
166 vlan->vlan_proto = proto;
167 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
168 vlan->real_dev = real_dev;
169 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
170 vlan->flags = VLAN_FLAG_REORDER_HDR;
172 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
177 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
181 else if (dev->mtu > max_mtu)
184 err = vlan_changelink(dev, tb, data, extack);
188 return register_vlan_dev(dev, extack);
191 static inline size_t vlan_qos_map_size(unsigned int n)
195 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
196 return nla_total_size(sizeof(struct nlattr)) +
197 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
200 static size_t vlan_get_size(const struct net_device *dev)
202 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
204 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
205 nla_total_size(2) + /* IFLA_VLAN_ID */
206 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
207 vlan_qos_map_size(vlan->nr_ingress_mappings) +
208 vlan_qos_map_size(vlan->nr_egress_mappings);
211 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
213 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
214 struct vlan_priority_tci_mapping *pm;
215 struct ifla_vlan_flags f;
216 struct ifla_vlan_qos_mapping m;
220 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
221 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
222 goto nla_put_failure;
224 f.flags = vlan->flags;
226 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
227 goto nla_put_failure;
229 if (vlan->nr_ingress_mappings) {
230 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
232 goto nla_put_failure;
234 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
235 if (!vlan->ingress_priority_map[i])
239 m.to = vlan->ingress_priority_map[i];
240 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
242 goto nla_put_failure;
244 nla_nest_end(skb, nest);
247 if (vlan->nr_egress_mappings) {
248 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
250 goto nla_put_failure;
252 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
253 for (pm = vlan->egress_priority_map[i]; pm;
258 m.from = pm->priority;
259 m.to = (pm->vlan_qos >> 13) & 0x7;
260 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
262 goto nla_put_failure;
265 nla_nest_end(skb, nest);
273 static struct net *vlan_get_link_net(const struct net_device *dev)
275 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
277 return dev_net(real_dev);
280 struct rtnl_link_ops vlan_link_ops __read_mostly = {
282 .maxtype = IFLA_VLAN_MAX,
283 .policy = vlan_policy,
284 .priv_size = sizeof(struct vlan_dev_priv),
286 .validate = vlan_validate,
287 .newlink = vlan_newlink,
288 .changelink = vlan_changelink,
289 .dellink = unregister_vlan_dev,
290 .get_size = vlan_get_size,
291 .fill_info = vlan_fill_info,
292 .get_link_net = vlan_get_link_net,
295 int __init vlan_netlink_init(void)
297 return rtnl_link_register(&vlan_link_ops);
300 void __exit vlan_netlink_fini(void)
302 rtnl_link_unregister(&vlan_link_ops);
305 MODULE_ALIAS_RTNL_LINK("vlan");