1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * VLAN netlink control interface
4 *
5 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
6 */
7
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>
15 #include "vlan.h"
16
17
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 },
24 };
25
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) },
28 };
29
30
vlan_validate_qos_map(struct nlattr * attr)31 static inline int vlan_validate_qos_map(struct nlattr *attr)
32 {
33 if (!attr)
34 return 0;
35 return nla_validate_nested_deprecated(attr, IFLA_VLAN_QOS_MAX,
36 vlan_map_policy, NULL);
37 }
38
vlan_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)39 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
40 struct netlink_ext_ack *extack)
41 {
42 struct ifla_vlan_flags *flags;
43 u16 id;
44 int err;
45
46 if (tb[IFLA_ADDRESS]) {
47 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
48 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
49 return -EINVAL;
50 }
51 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
52 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
53 return -EADDRNOTAVAIL;
54 }
55 }
56
57 if (!data) {
58 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
59 return -EINVAL;
60 }
61
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):
66 break;
67 default:
68 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
69 return -EPROTONOSUPPORT;
70 }
71 }
72
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");
77 return -ERANGE;
78 }
79 }
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");
87 return -EINVAL;
88 }
89 }
90
91 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
92 if (err < 0) {
93 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
94 return err;
95 }
96 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
97 if (err < 0) {
98 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
99 return err;
100 }
101 return 0;
102 }
103
vlan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)104 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
105 struct nlattr *data[],
106 struct netlink_ext_ack *extack)
107 {
108 struct ifla_vlan_flags *flags;
109 struct ifla_vlan_qos_mapping *m;
110 struct nlattr *attr;
111 int rem, err;
112
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);
116 if (err)
117 return err;
118 }
119 if (data[IFLA_VLAN_INGRESS_QOS]) {
120 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
121 m = nla_data(attr);
122 vlan_dev_set_ingress_priority(dev, m->to, m->from);
123 }
124 }
125 if (data[IFLA_VLAN_EGRESS_QOS]) {
126 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
127 m = nla_data(attr);
128 err = vlan_dev_set_egress_priority(dev, m->from, m->to);
129 if (err)
130 return err;
131 }
132 }
133 return 0;
134 }
135
vlan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)136 static int vlan_newlink(struct net *src_net, struct net_device *dev,
137 struct nlattr *tb[], struct nlattr *data[],
138 struct netlink_ext_ack *extack)
139 {
140 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
141 struct net_device *real_dev;
142 unsigned int max_mtu;
143 __be16 proto;
144 int err;
145
146 if (!data[IFLA_VLAN_ID]) {
147 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
148 return -EINVAL;
149 }
150
151 if (!tb[IFLA_LINK]) {
152 NL_SET_ERR_MSG_MOD(extack, "link not specified");
153 return -EINVAL;
154 }
155
156 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
157 if (!real_dev) {
158 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
159 return -ENODEV;
160 }
161
162 if (data[IFLA_VLAN_PROTOCOL])
163 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
164 else
165 proto = htons(ETH_P_8021Q);
166
167 vlan->vlan_proto = proto;
168 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
169 vlan->real_dev = real_dev;
170 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
171 vlan->flags = VLAN_FLAG_REORDER_HDR;
172
173 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
174 extack);
175 if (err < 0)
176 return err;
177
178 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
179 real_dev->mtu;
180 if (!tb[IFLA_MTU])
181 dev->mtu = max_mtu;
182 else if (dev->mtu > max_mtu)
183 return -EINVAL;
184
185 /* Note: If this initial vlan_changelink() fails, we need
186 * to call vlan_dev_free_egress_priority() to free memory.
187 */
188 err = vlan_changelink(dev, tb, data, extack);
189
190 if (!err)
191 err = register_vlan_dev(dev, extack);
192
193 if (err)
194 vlan_dev_free_egress_priority(dev);
195 return err;
196 }
197
vlan_qos_map_size(unsigned int n)198 static inline size_t vlan_qos_map_size(unsigned int n)
199 {
200 if (n == 0)
201 return 0;
202 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
203 return nla_total_size(sizeof(struct nlattr)) +
204 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
205 }
206
vlan_get_size(const struct net_device * dev)207 static size_t vlan_get_size(const struct net_device *dev)
208 {
209 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
210
211 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
212 nla_total_size(2) + /* IFLA_VLAN_ID */
213 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
214 vlan_qos_map_size(vlan->nr_ingress_mappings) +
215 vlan_qos_map_size(vlan->nr_egress_mappings);
216 }
217
vlan_fill_info(struct sk_buff * skb,const struct net_device * dev)218 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
219 {
220 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
221 struct vlan_priority_tci_mapping *pm;
222 struct ifla_vlan_flags f;
223 struct ifla_vlan_qos_mapping m;
224 struct nlattr *nest;
225 unsigned int i;
226
227 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
228 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
229 goto nla_put_failure;
230 if (vlan->flags) {
231 f.flags = vlan->flags;
232 f.mask = ~0;
233 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
234 goto nla_put_failure;
235 }
236 if (vlan->nr_ingress_mappings) {
237 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
238 if (nest == NULL)
239 goto nla_put_failure;
240
241 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
242 if (!vlan->ingress_priority_map[i])
243 continue;
244
245 m.from = i;
246 m.to = vlan->ingress_priority_map[i];
247 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
248 sizeof(m), &m))
249 goto nla_put_failure;
250 }
251 nla_nest_end(skb, nest);
252 }
253
254 if (vlan->nr_egress_mappings) {
255 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
256 if (nest == NULL)
257 goto nla_put_failure;
258
259 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
260 for (pm = vlan->egress_priority_map[i]; pm;
261 pm = pm->next) {
262 if (!pm->vlan_qos)
263 continue;
264
265 m.from = pm->priority;
266 m.to = (pm->vlan_qos >> 13) & 0x7;
267 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
268 sizeof(m), &m))
269 goto nla_put_failure;
270 }
271 }
272 nla_nest_end(skb, nest);
273 }
274 return 0;
275
276 nla_put_failure:
277 return -EMSGSIZE;
278 }
279
vlan_get_link_net(const struct net_device * dev)280 static struct net *vlan_get_link_net(const struct net_device *dev)
281 {
282 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
283
284 return dev_net(real_dev);
285 }
286
287 struct rtnl_link_ops vlan_link_ops __read_mostly = {
288 .kind = "vlan",
289 .maxtype = IFLA_VLAN_MAX,
290 .policy = vlan_policy,
291 .priv_size = sizeof(struct vlan_dev_priv),
292 .setup = vlan_setup,
293 .validate = vlan_validate,
294 .newlink = vlan_newlink,
295 .changelink = vlan_changelink,
296 .dellink = unregister_vlan_dev,
297 .get_size = vlan_get_size,
298 .fill_info = vlan_fill_info,
299 .get_link_net = vlan_get_link_net,
300 };
301
vlan_netlink_init(void)302 int __init vlan_netlink_init(void)
303 {
304 return rtnl_link_register(&vlan_link_ops);
305 }
306
vlan_netlink_fini(void)307 void __exit vlan_netlink_fini(void)
308 {
309 rtnl_link_unregister(&vlan_link_ops);
310 }
311
312 MODULE_ALIAS_RTNL_LINK("vlan");
313
