1 /*
2 * VLAN netlink control interface
3 *
4 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
5 *
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.
9 */
10
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>
18 #include "vlan.h"
19
20
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 },
27 };
28
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) },
31 };
32
33
vlan_validate_qos_map(struct nlattr * attr)34 static inline int vlan_validate_qos_map(struct nlattr *attr)
35 {
36 if (!attr)
37 return 0;
38 return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy,
39 NULL);
40 }
41
vlan_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)42 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
43 struct netlink_ext_ack *extack)
44 {
45 struct ifla_vlan_flags *flags;
46 u16 id;
47 int err;
48
49 if (tb[IFLA_ADDRESS]) {
50 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
51 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
52 return -EINVAL;
53 }
54 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
55 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
56 return -EADDRNOTAVAIL;
57 }
58 }
59
60 if (!data) {
61 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
62 return -EINVAL;
63 }
64
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):
69 break;
70 default:
71 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
72 return -EPROTONOSUPPORT;
73 }
74 }
75
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");
80 return -ERANGE;
81 }
82 }
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 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
89 return -EINVAL;
90 }
91 }
92
93 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
94 if (err < 0) {
95 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
96 return err;
97 }
98 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
99 if (err < 0) {
100 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
101 return err;
102 }
103 return 0;
104 }
105
vlan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)106 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
107 struct nlattr *data[],
108 struct netlink_ext_ack *extack)
109 {
110 struct ifla_vlan_flags *flags;
111 struct ifla_vlan_qos_mapping *m;
112 struct nlattr *attr;
113 int rem, err;
114
115 if (data[IFLA_VLAN_FLAGS]) {
116 flags = nla_data(data[IFLA_VLAN_FLAGS]);
117 err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
118 if (err)
119 return err;
120 }
121 if (data[IFLA_VLAN_INGRESS_QOS]) {
122 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
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 m = nla_data(attr);
130 err = vlan_dev_set_egress_priority(dev, m->from, m->to);
131 if (err)
132 return err;
133 }
134 }
135 return 0;
136 }
137
vlan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)138 static int vlan_newlink(struct net *src_net, struct net_device *dev,
139 struct nlattr *tb[], struct nlattr *data[],
140 struct netlink_ext_ack *extack)
141 {
142 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
143 struct net_device *real_dev;
144 unsigned int max_mtu;
145 __be16 proto;
146 int err;
147
148 if (!data[IFLA_VLAN_ID]) {
149 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
150 return -EINVAL;
151 }
152
153 if (!tb[IFLA_LINK]) {
154 NL_SET_ERR_MSG_MOD(extack, "link not specified");
155 return -EINVAL;
156 }
157
158 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
159 if (!real_dev) {
160 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
161 return -ENODEV;
162 }
163
164 if (data[IFLA_VLAN_PROTOCOL])
165 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
166 else
167 proto = htons(ETH_P_8021Q);
168
169 vlan->vlan_proto = proto;
170 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
171 vlan->real_dev = real_dev;
172 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
173 vlan->flags = VLAN_FLAG_REORDER_HDR;
174
175 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
176 extack);
177 if (err < 0)
178 return err;
179
180 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
181 real_dev->mtu;
182 if (!tb[IFLA_MTU])
183 dev->mtu = max_mtu;
184 else if (dev->mtu > max_mtu)
185 return -EINVAL;
186
187 err = vlan_changelink(dev, tb, data, extack);
188 if (!err)
189 err = register_vlan_dev(dev, extack);
190 if (err)
191 vlan_dev_uninit(dev);
192 return err;
193 }
194
vlan_qos_map_size(unsigned int n)195 static inline size_t vlan_qos_map_size(unsigned int n)
196 {
197 if (n == 0)
198 return 0;
199 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
200 return nla_total_size(sizeof(struct nlattr)) +
201 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
202 }
203
vlan_get_size(const struct net_device * dev)204 static size_t vlan_get_size(const struct net_device *dev)
205 {
206 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
207
208 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
209 nla_total_size(2) + /* IFLA_VLAN_ID */
210 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
211 vlan_qos_map_size(vlan->nr_ingress_mappings) +
212 vlan_qos_map_size(vlan->nr_egress_mappings);
213 }
214
vlan_fill_info(struct sk_buff * skb,const struct net_device * dev)215 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
216 {
217 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
218 struct vlan_priority_tci_mapping *pm;
219 struct ifla_vlan_flags f;
220 struct ifla_vlan_qos_mapping m;
221 struct nlattr *nest;
222 unsigned int i;
223
224 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
225 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
226 goto nla_put_failure;
227 if (vlan->flags) {
228 f.flags = vlan->flags;
229 f.mask = ~0;
230 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
231 goto nla_put_failure;
232 }
233 if (vlan->nr_ingress_mappings) {
234 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
235 if (nest == NULL)
236 goto nla_put_failure;
237
238 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
239 if (!vlan->ingress_priority_map[i])
240 continue;
241
242 m.from = i;
243 m.to = vlan->ingress_priority_map[i];
244 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
245 sizeof(m), &m))
246 goto nla_put_failure;
247 }
248 nla_nest_end(skb, nest);
249 }
250
251 if (vlan->nr_egress_mappings) {
252 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
253 if (nest == NULL)
254 goto nla_put_failure;
255
256 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
257 for (pm = vlan->egress_priority_map[i]; pm;
258 pm = pm->next) {
259 if (!pm->vlan_qos)
260 continue;
261
262 m.from = pm->priority;
263 m.to = (pm->vlan_qos >> 13) & 0x7;
264 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
265 sizeof(m), &m))
266 goto nla_put_failure;
267 }
268 }
269 nla_nest_end(skb, nest);
270 }
271 return 0;
272
273 nla_put_failure:
274 return -EMSGSIZE;
275 }
276
vlan_get_link_net(const struct net_device * dev)277 static struct net *vlan_get_link_net(const struct net_device *dev)
278 {
279 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
280
281 return dev_net(real_dev);
282 }
283
284 struct rtnl_link_ops vlan_link_ops __read_mostly = {
285 .kind = "vlan",
286 .maxtype = IFLA_VLAN_MAX,
287 .policy = vlan_policy,
288 .priv_size = sizeof(struct vlan_dev_priv),
289 .setup = vlan_setup,
290 .validate = vlan_validate,
291 .newlink = vlan_newlink,
292 .changelink = vlan_changelink,
293 .dellink = unregister_vlan_dev,
294 .get_size = vlan_get_size,
295 .fill_info = vlan_fill_info,
296 .get_link_net = vlan_get_link_net,
297 };
298
vlan_netlink_init(void)299 int __init vlan_netlink_init(void)
300 {
301 return rtnl_link_register(&vlan_link_ops);
302 }
303
vlan_netlink_fini(void)304 void __exit vlan_netlink_fini(void)
305 {
306 rtnl_link_unregister(&vlan_link_ops);
307 }
308
309 MODULE_ALIAS_RTNL_LINK("vlan");
310