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 err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
119 if (data[IFLA_VLAN_INGRESS_QOS]) {
120 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
121 if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
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) {
129 if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
132 err = vlan_dev_set_egress_priority(dev, m->from, m->to);
140 static int vlan_newlink(struct net *src_net, struct net_device *dev,
141 struct nlattr *tb[], struct nlattr *data[],
142 struct netlink_ext_ack *extack)
144 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
145 struct net_device *real_dev;
146 unsigned int max_mtu;
150 if (!data[IFLA_VLAN_ID]) {
151 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
155 if (!tb[IFLA_LINK]) {
156 NL_SET_ERR_MSG_MOD(extack, "link not specified");
160 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
162 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
166 if (data[IFLA_VLAN_PROTOCOL])
167 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
169 proto = htons(ETH_P_8021Q);
171 vlan->vlan_proto = proto;
172 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
173 vlan->real_dev = real_dev;
174 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
175 vlan->flags = VLAN_FLAG_REORDER_HDR;
177 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
182 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
186 else if (dev->mtu > max_mtu)
189 err = vlan_changelink(dev, tb, data, extack);
191 err = register_vlan_dev(dev, extack);
193 vlan_dev_uninit(dev);
197 static inline size_t vlan_qos_map_size(unsigned int n)
201 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
202 return nla_total_size(sizeof(struct nlattr)) +
203 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
206 static size_t vlan_get_size(const struct net_device *dev)
208 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
210 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
211 nla_total_size(2) + /* IFLA_VLAN_ID */
212 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
213 vlan_qos_map_size(vlan->nr_ingress_mappings) +
214 vlan_qos_map_size(vlan->nr_egress_mappings);
217 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
219 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
220 struct vlan_priority_tci_mapping *pm;
221 struct ifla_vlan_flags f;
222 struct ifla_vlan_qos_mapping m;
226 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
227 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
228 goto nla_put_failure;
230 f.flags = vlan->flags;
232 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
233 goto nla_put_failure;
235 if (vlan->nr_ingress_mappings) {
236 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
238 goto nla_put_failure;
240 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
241 if (!vlan->ingress_priority_map[i])
245 m.to = vlan->ingress_priority_map[i];
246 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
248 goto nla_put_failure;
250 nla_nest_end(skb, nest);
253 if (vlan->nr_egress_mappings) {
254 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
256 goto nla_put_failure;
258 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
259 for (pm = vlan->egress_priority_map[i]; pm;
264 m.from = pm->priority;
265 m.to = (pm->vlan_qos >> 13) & 0x7;
266 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
268 goto nla_put_failure;
271 nla_nest_end(skb, nest);
279 static struct net *vlan_get_link_net(const struct net_device *dev)
281 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
283 return dev_net(real_dev);
286 struct rtnl_link_ops vlan_link_ops __read_mostly = {
288 .maxtype = IFLA_VLAN_MAX,
289 .policy = vlan_policy,
290 .priv_size = sizeof(struct vlan_dev_priv),
292 .validate = vlan_validate,
293 .newlink = vlan_newlink,
294 .changelink = vlan_changelink,
295 .dellink = unregister_vlan_dev,
296 .get_size = vlan_get_size,
297 .fill_info = vlan_fill_info,
298 .get_link_net = vlan_get_link_net,
301 int __init vlan_netlink_init(void)
303 return rtnl_link_register(&vlan_link_ops);
306 void __exit vlan_netlink_fini(void)
308 rtnl_link_unregister(&vlan_link_ops);
311 MODULE_ALIAS_RTNL_LINK("vlan");