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 return -EINVAL;
52 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
53 return -EADDRNOTAVAIL;
54 }
55
56 if (!data)
57 return -EINVAL;
58
59 if (data[IFLA_VLAN_PROTOCOL]) {
60 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
61 case htons(ETH_P_8021Q):
62 case htons(ETH_P_8021AD):
63 break;
64 default:
65 return -EPROTONOSUPPORT;
66 }
67 }
68
69 if (data[IFLA_VLAN_ID]) {
70 id = nla_get_u16(data[IFLA_VLAN_ID]);
71 if (id >= VLAN_VID_MASK)
72 return -ERANGE;
73 }
74 if (data[IFLA_VLAN_FLAGS]) {
75 flags = nla_data(data[IFLA_VLAN_FLAGS]);
76 if ((flags->flags & flags->mask) &
77 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
78 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
79 return -EINVAL;
80 }
81
82 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
83 if (err < 0)
84 return err;
85 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
86 if (err < 0)
87 return err;
88 return 0;
89 }
90
vlan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)91 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
92 struct nlattr *data[],
93 struct netlink_ext_ack *extack)
94 {
95 struct ifla_vlan_flags *flags;
96 struct ifla_vlan_qos_mapping *m;
97 struct nlattr *attr;
98 int rem, err;
99
100 if (data[IFLA_VLAN_FLAGS]) {
101 flags = nla_data(data[IFLA_VLAN_FLAGS]);
102 err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
103 if (err)
104 return err;
105 }
106 if (data[IFLA_VLAN_INGRESS_QOS]) {
107 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
108 m = nla_data(attr);
109 vlan_dev_set_ingress_priority(dev, m->to, m->from);
110 }
111 }
112 if (data[IFLA_VLAN_EGRESS_QOS]) {
113 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
114 m = nla_data(attr);
115 err = vlan_dev_set_egress_priority(dev, m->from, m->to);
116 if (err)
117 return err;
118 }
119 }
120 return 0;
121 }
122
vlan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)123 static int vlan_newlink(struct net *src_net, struct net_device *dev,
124 struct nlattr *tb[], struct nlattr *data[],
125 struct netlink_ext_ack *extack)
126 {
127 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
128 struct net_device *real_dev;
129 unsigned int max_mtu;
130 __be16 proto;
131 int err;
132
133 if (!data[IFLA_VLAN_ID])
134 return -EINVAL;
135
136 if (!tb[IFLA_LINK])
137 return -EINVAL;
138 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
139 if (!real_dev)
140 return -ENODEV;
141
142 if (data[IFLA_VLAN_PROTOCOL])
143 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
144 else
145 proto = htons(ETH_P_8021Q);
146
147 vlan->vlan_proto = proto;
148 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
149 vlan->real_dev = real_dev;
150 vlan->flags = VLAN_FLAG_REORDER_HDR;
151
152 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
153 if (err < 0)
154 return err;
155
156 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
157 real_dev->mtu;
158 if (!tb[IFLA_MTU])
159 dev->mtu = max_mtu;
160 else if (dev->mtu > max_mtu)
161 return -EINVAL;
162
163 err = vlan_changelink(dev, tb, data, extack);
164 if (!err)
165 err = register_vlan_dev(dev);
166 if (err)
167 vlan_dev_uninit(dev);
168 return err;
169 }
170
vlan_qos_map_size(unsigned int n)171 static inline size_t vlan_qos_map_size(unsigned int n)
172 {
173 if (n == 0)
174 return 0;
175 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
176 return nla_total_size(sizeof(struct nlattr)) +
177 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
178 }
179
vlan_get_size(const struct net_device * dev)180 static size_t vlan_get_size(const struct net_device *dev)
181 {
182 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
183
184 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
185 nla_total_size(2) + /* IFLA_VLAN_ID */
186 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
187 vlan_qos_map_size(vlan->nr_ingress_mappings) +
188 vlan_qos_map_size(vlan->nr_egress_mappings);
189 }
190
vlan_fill_info(struct sk_buff * skb,const struct net_device * dev)191 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
192 {
193 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
194 struct vlan_priority_tci_mapping *pm;
195 struct ifla_vlan_flags f;
196 struct ifla_vlan_qos_mapping m;
197 struct nlattr *nest;
198 unsigned int i;
199
200 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
201 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
202 goto nla_put_failure;
203 if (vlan->flags) {
204 f.flags = vlan->flags;
205 f.mask = ~0;
206 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
207 goto nla_put_failure;
208 }
209 if (vlan->nr_ingress_mappings) {
210 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
211 if (nest == NULL)
212 goto nla_put_failure;
213
214 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
215 if (!vlan->ingress_priority_map[i])
216 continue;
217
218 m.from = i;
219 m.to = vlan->ingress_priority_map[i];
220 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
221 sizeof(m), &m))
222 goto nla_put_failure;
223 }
224 nla_nest_end(skb, nest);
225 }
226
227 if (vlan->nr_egress_mappings) {
228 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
229 if (nest == NULL)
230 goto nla_put_failure;
231
232 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
233 for (pm = vlan->egress_priority_map[i]; pm;
234 pm = pm->next) {
235 if (!pm->vlan_qos)
236 continue;
237
238 m.from = pm->priority;
239 m.to = (pm->vlan_qos >> 13) & 0x7;
240 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
241 sizeof(m), &m))
242 goto nla_put_failure;
243 }
244 }
245 nla_nest_end(skb, nest);
246 }
247 return 0;
248
249 nla_put_failure:
250 return -EMSGSIZE;
251 }
252
vlan_get_link_net(const struct net_device * dev)253 static struct net *vlan_get_link_net(const struct net_device *dev)
254 {
255 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
256
257 return dev_net(real_dev);
258 }
259
260 struct rtnl_link_ops vlan_link_ops __read_mostly = {
261 .kind = "vlan",
262 .maxtype = IFLA_VLAN_MAX,
263 .policy = vlan_policy,
264 .priv_size = sizeof(struct vlan_dev_priv),
265 .setup = vlan_setup,
266 .validate = vlan_validate,
267 .newlink = vlan_newlink,
268 .changelink = vlan_changelink,
269 .dellink = unregister_vlan_dev,
270 .get_size = vlan_get_size,
271 .fill_info = vlan_fill_info,
272 .get_link_net = vlan_get_link_net,
273 };
274
vlan_netlink_init(void)275 int __init vlan_netlink_init(void)
276 {
277 return rtnl_link_register(&vlan_link_ops);
278 }
279
vlan_netlink_fini(void)280 void __exit vlan_netlink_fini(void)
281 {
282 rtnl_link_unregister(&vlan_link_ops);
283 }
284
285 MODULE_ALIAS_RTNL_LINK("vlan");
286