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 if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
122 continue;
123 m = nla_data(attr);
124 vlan_dev_set_ingress_priority(dev, m->to, m->from);
125 }
126 }
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)
130 continue;
131 m = nla_data(attr);
132 err = vlan_dev_set_egress_priority(dev, m->from, m->to);
133 if (err)
134 return err;
135 }
136 }
137 return 0;
138 }
139
vlan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)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)
143 {
144 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
145 struct net_device *real_dev;
146 unsigned int max_mtu;
147 __be16 proto;
148 int err;
149
150 if (!data[IFLA_VLAN_ID]) {
151 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
152 return -EINVAL;
153 }
154
155 if (!tb[IFLA_LINK]) {
156 NL_SET_ERR_MSG_MOD(extack, "link not specified");
157 return -EINVAL;
158 }
159
160 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
161 if (!real_dev) {
162 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
163 return -ENODEV;
164 }
165
166 if (data[IFLA_VLAN_PROTOCOL])
167 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
168 else
169 proto = htons(ETH_P_8021Q);
170
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;
176
177 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
178 extack);
179 if (err < 0)
180 return err;
181
182 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
183 real_dev->mtu;
184 if (!tb[IFLA_MTU])
185 dev->mtu = max_mtu;
186 else if (dev->mtu > max_mtu)
187 return -EINVAL;
188
189 /* Note: If this initial vlan_changelink() fails, we need
190 * to call vlan_dev_free_egress_priority() to free memory.
191 */
192 err = vlan_changelink(dev, tb, data, extack);
193
194 if (!err)
195 err = register_vlan_dev(dev, extack);
196
197 if (err)
198 vlan_dev_free_egress_priority(dev);
199 return err;
200 }
201
vlan_qos_map_size(unsigned int n)202 static inline size_t vlan_qos_map_size(unsigned int n)
203 {
204 if (n == 0)
205 return 0;
206 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
207 return nla_total_size(sizeof(struct nlattr)) +
208 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
209 }
210
vlan_get_size(const struct net_device * dev)211 static size_t vlan_get_size(const struct net_device *dev)
212 {
213 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
214
215 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
216 nla_total_size(2) + /* IFLA_VLAN_ID */
217 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
218 vlan_qos_map_size(vlan->nr_ingress_mappings) +
219 vlan_qos_map_size(vlan->nr_egress_mappings);
220 }
221
vlan_fill_info(struct sk_buff * skb,const struct net_device * dev)222 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
223 {
224 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
225 struct vlan_priority_tci_mapping *pm;
226 struct ifla_vlan_flags f;
227 struct ifla_vlan_qos_mapping m;
228 struct nlattr *nest;
229 unsigned int i;
230
231 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
232 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
233 goto nla_put_failure;
234 if (vlan->flags) {
235 f.flags = vlan->flags;
236 f.mask = ~0;
237 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
238 goto nla_put_failure;
239 }
240 if (vlan->nr_ingress_mappings) {
241 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
242 if (nest == NULL)
243 goto nla_put_failure;
244
245 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
246 if (!vlan->ingress_priority_map[i])
247 continue;
248
249 m.from = i;
250 m.to = vlan->ingress_priority_map[i];
251 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
252 sizeof(m), &m))
253 goto nla_put_failure;
254 }
255 nla_nest_end(skb, nest);
256 }
257
258 if (vlan->nr_egress_mappings) {
259 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
260 if (nest == NULL)
261 goto nla_put_failure;
262
263 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
264 for (pm = vlan->egress_priority_map[i]; pm;
265 pm = pm->next) {
266 if (!pm->vlan_qos)
267 continue;
268
269 m.from = pm->priority;
270 m.to = (pm->vlan_qos >> 13) & 0x7;
271 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
272 sizeof(m), &m))
273 goto nla_put_failure;
274 }
275 }
276 nla_nest_end(skb, nest);
277 }
278 return 0;
279
280 nla_put_failure:
281 return -EMSGSIZE;
282 }
283
vlan_get_link_net(const struct net_device * dev)284 static struct net *vlan_get_link_net(const struct net_device *dev)
285 {
286 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
287
288 return dev_net(real_dev);
289 }
290
291 struct rtnl_link_ops vlan_link_ops __read_mostly = {
292 .kind = "vlan",
293 .maxtype = IFLA_VLAN_MAX,
294 .policy = vlan_policy,
295 .priv_size = sizeof(struct vlan_dev_priv),
296 .setup = vlan_setup,
297 .validate = vlan_validate,
298 .newlink = vlan_newlink,
299 .changelink = vlan_changelink,
300 .dellink = unregister_vlan_dev,
301 .get_size = vlan_get_size,
302 .fill_info = vlan_fill_info,
303 .get_link_net = vlan_get_link_net,
304 };
305
vlan_netlink_init(void)306 int __init vlan_netlink_init(void)
307 {
308 return rtnl_link_register(&vlan_link_ops);
309 }
310
vlan_netlink_fini(void)311 void __exit vlan_netlink_fini(void)
312 {
313 rtnl_link_unregister(&vlan_link_ops);
314 }
315
316 MODULE_ALIAS_RTNL_LINK("vlan");
317