1 // SPDX-License-Identifier: GPL-2.0-only
3 * VLAN netlink control interface
5 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
8 #include <linux/kernel.h>
9 #include <linux/netdevice.h>
10 #include <linux/if_vlan.h>
11 #include <linux/module.h>
12 #include <net/net_namespace.h>
13 #include <net/netlink.h>
14 #include <net/rtnetlink.h>
18 static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
19 [IFLA_VLAN_ID] = { .type = NLA_U16 },
20 [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
21 [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
22 [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
23 [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
26 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
27 [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
31 static inline int vlan_validate_qos_map(struct nlattr *attr)
35 return nla_validate_nested_deprecated(attr, IFLA_VLAN_QOS_MAX,
36 vlan_map_policy, NULL);
39 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
40 struct netlink_ext_ack *extack)
42 struct ifla_vlan_flags *flags;
46 if (tb[IFLA_ADDRESS]) {
47 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
48 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
51 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
52 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
53 return -EADDRNOTAVAIL;
58 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
62 if (data[IFLA_VLAN_PROTOCOL]) {
63 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
64 case htons(ETH_P_8021Q):
65 case htons(ETH_P_8021AD):
68 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
69 return -EPROTONOSUPPORT;
73 if (data[IFLA_VLAN_ID]) {
74 id = nla_get_u16(data[IFLA_VLAN_ID]);
75 if (id >= VLAN_VID_MASK) {
76 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id");
80 if (data[IFLA_VLAN_FLAGS]) {
81 flags = nla_data(data[IFLA_VLAN_FLAGS]);
82 if ((flags->flags & flags->mask) &
83 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
84 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
85 VLAN_FLAG_BRIDGE_BINDING)) {
86 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
91 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
93 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
96 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
98 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
104 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
105 struct nlattr *data[],
106 struct netlink_ext_ack *extack)
108 struct ifla_vlan_flags *flags;
109 struct ifla_vlan_qos_mapping *m;
113 if (data[IFLA_VLAN_FLAGS]) {
114 flags = nla_data(data[IFLA_VLAN_FLAGS]);
115 vlan_dev_change_flags(dev, flags->flags, flags->mask);
117 if (data[IFLA_VLAN_INGRESS_QOS]) {
118 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
120 vlan_dev_set_ingress_priority(dev, m->to, m->from);
123 if (data[IFLA_VLAN_EGRESS_QOS]) {
124 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
126 vlan_dev_set_egress_priority(dev, m->from, m->to);
132 static int vlan_newlink(struct net *src_net, struct net_device *dev,
133 struct nlattr *tb[], struct nlattr *data[],
134 struct netlink_ext_ack *extack)
136 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
137 struct net_device *real_dev;
138 unsigned int max_mtu;
142 if (!data[IFLA_VLAN_ID]) {
143 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
147 if (!tb[IFLA_LINK]) {
148 NL_SET_ERR_MSG_MOD(extack, "link not specified");
152 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
154 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
158 if (data[IFLA_VLAN_PROTOCOL])
159 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
161 proto = htons(ETH_P_8021Q);
163 vlan->vlan_proto = proto;
164 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
165 vlan->real_dev = real_dev;
166 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
167 vlan->flags = VLAN_FLAG_REORDER_HDR;
169 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
174 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
178 else if (dev->mtu > max_mtu)
181 err = vlan_changelink(dev, tb, data, extack);
185 return register_vlan_dev(dev, extack);
188 static inline size_t vlan_qos_map_size(unsigned int n)
192 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
193 return nla_total_size(sizeof(struct nlattr)) +
194 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
197 static size_t vlan_get_size(const struct net_device *dev)
199 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
201 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
202 nla_total_size(2) + /* IFLA_VLAN_ID */
203 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
204 vlan_qos_map_size(vlan->nr_ingress_mappings) +
205 vlan_qos_map_size(vlan->nr_egress_mappings);
208 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
210 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
211 struct vlan_priority_tci_mapping *pm;
212 struct ifla_vlan_flags f;
213 struct ifla_vlan_qos_mapping m;
217 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
218 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
219 goto nla_put_failure;
221 f.flags = vlan->flags;
223 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
224 goto nla_put_failure;
226 if (vlan->nr_ingress_mappings) {
227 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
229 goto nla_put_failure;
231 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
232 if (!vlan->ingress_priority_map[i])
236 m.to = vlan->ingress_priority_map[i];
237 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
239 goto nla_put_failure;
241 nla_nest_end(skb, nest);
244 if (vlan->nr_egress_mappings) {
245 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
247 goto nla_put_failure;
249 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
250 for (pm = vlan->egress_priority_map[i]; pm;
255 m.from = pm->priority;
256 m.to = (pm->vlan_qos >> 13) & 0x7;
257 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
259 goto nla_put_failure;
262 nla_nest_end(skb, nest);
270 static struct net *vlan_get_link_net(const struct net_device *dev)
272 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
274 return dev_net(real_dev);
277 struct rtnl_link_ops vlan_link_ops __read_mostly = {
279 .maxtype = IFLA_VLAN_MAX,
280 .policy = vlan_policy,
281 .priv_size = sizeof(struct vlan_dev_priv),
283 .validate = vlan_validate,
284 .newlink = vlan_newlink,
285 .changelink = vlan_changelink,
286 .dellink = unregister_vlan_dev,
287 .get_size = vlan_get_size,
288 .fill_info = vlan_fill_info,
289 .get_link_net = vlan_get_link_net,
292 int __init vlan_netlink_init(void)
294 return rtnl_link_register(&vlan_link_ops);
297 void __exit vlan_netlink_fini(void)
299 rtnl_link_unregister(&vlan_link_ops);
302 MODULE_ALIAS_RTNL_LINK("vlan");