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 }
40
vlan_validate(struct nlattr * tb[],struct nlattr * data[])41 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
42 {
43 struct ifla_vlan_flags *flags;
44 u16 id;
45 int err;
46
47 if (tb[IFLA_ADDRESS]) {
48 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
49 return -EINVAL;
50 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
51 return -EADDRNOTAVAIL;
52 }
53
54 if (!data)
55 return -EINVAL;
56
57 if (data[IFLA_VLAN_PROTOCOL]) {
58 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
59 case htons(ETH_P_8021Q):
60 case htons(ETH_P_8021AD):
61 break;
62 default:
63 return -EPROTONOSUPPORT;
64 }
65 }
66
67 if (data[IFLA_VLAN_ID]) {
68 id = nla_get_u16(data[IFLA_VLAN_ID]);
69 if (id >= VLAN_VID_MASK)
70 return -ERANGE;
71 }
72 if (data[IFLA_VLAN_FLAGS]) {
73 flags = nla_data(data[IFLA_VLAN_FLAGS]);
74 if ((flags->flags & flags->mask) &
75 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
76 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
77 return -EINVAL;
78 }
79
80 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
81 if (err < 0)
82 return err;
83 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
84 if (err < 0)
85 return err;
86 return 0;
87 }
88
vlan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[])89 static int vlan_changelink(struct net_device *dev,
90 struct nlattr *tb[], struct nlattr *data[])
91 {
92 struct ifla_vlan_flags *flags;
93 struct ifla_vlan_qos_mapping *m;
94 struct nlattr *attr;
95 int rem, err;
96
97 if (data[IFLA_VLAN_FLAGS]) {
98 flags = nla_data(data[IFLA_VLAN_FLAGS]);
99 err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
100 if (err)
101 return err;
102 }
103 if (data[IFLA_VLAN_INGRESS_QOS]) {
104 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
105 m = nla_data(attr);
106 vlan_dev_set_ingress_priority(dev, m->to, m->from);
107 }
108 }
109 if (data[IFLA_VLAN_EGRESS_QOS]) {
110 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
111 m = nla_data(attr);
112 err = vlan_dev_set_egress_priority(dev, m->from, m->to);
113 if (err)
114 return err;
115 }
116 }
117 return 0;
118 }
119
vlan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[])120 static int vlan_newlink(struct net *src_net, struct net_device *dev,
121 struct nlattr *tb[], struct nlattr *data[])
122 {
123 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
124 struct net_device *real_dev;
125 __be16 proto;
126 int err;
127
128 if (!data[IFLA_VLAN_ID])
129 return -EINVAL;
130
131 if (!tb[IFLA_LINK])
132 return -EINVAL;
133 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
134 if (!real_dev)
135 return -ENODEV;
136
137 if (data[IFLA_VLAN_PROTOCOL])
138 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
139 else
140 proto = htons(ETH_P_8021Q);
141
142 vlan->vlan_proto = proto;
143 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
144 vlan->real_dev = real_dev;
145 vlan->flags = VLAN_FLAG_REORDER_HDR;
146
147 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
148 if (err < 0)
149 return err;
150
151 if (!tb[IFLA_MTU])
152 dev->mtu = real_dev->mtu;
153 else if (dev->mtu > real_dev->mtu)
154 return -EINVAL;
155
156 err = vlan_changelink(dev, tb, data);
157 if (!err)
158 err = register_vlan_dev(dev);
159 if (err)
160 vlan_dev_uninit(dev);
161 return err;
162 }
163
vlan_qos_map_size(unsigned int n)164 static inline size_t vlan_qos_map_size(unsigned int n)
165 {
166 if (n == 0)
167 return 0;
168 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
169 return nla_total_size(sizeof(struct nlattr)) +
170 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
171 }
172
vlan_get_size(const struct net_device * dev)173 static size_t vlan_get_size(const struct net_device *dev)
174 {
175 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
176
177 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
178 nla_total_size(2) + /* IFLA_VLAN_ID */
179 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
180 vlan_qos_map_size(vlan->nr_ingress_mappings) +
181 vlan_qos_map_size(vlan->nr_egress_mappings);
182 }
183
vlan_fill_info(struct sk_buff * skb,const struct net_device * dev)184 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
185 {
186 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
187 struct vlan_priority_tci_mapping *pm;
188 struct ifla_vlan_flags f;
189 struct ifla_vlan_qos_mapping m;
190 struct nlattr *nest;
191 unsigned int i;
192
193 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
194 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
195 goto nla_put_failure;
196 if (vlan->flags) {
197 f.flags = vlan->flags;
198 f.mask = ~0;
199 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
200 goto nla_put_failure;
201 }
202 if (vlan->nr_ingress_mappings) {
203 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
204 if (nest == NULL)
205 goto nla_put_failure;
206
207 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
208 if (!vlan->ingress_priority_map[i])
209 continue;
210
211 m.from = i;
212 m.to = vlan->ingress_priority_map[i];
213 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
214 sizeof(m), &m))
215 goto nla_put_failure;
216 }
217 nla_nest_end(skb, nest);
218 }
219
220 if (vlan->nr_egress_mappings) {
221 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
222 if (nest == NULL)
223 goto nla_put_failure;
224
225 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
226 for (pm = vlan->egress_priority_map[i]; pm;
227 pm = pm->next) {
228 if (!pm->vlan_qos)
229 continue;
230
231 m.from = pm->priority;
232 m.to = (pm->vlan_qos >> 13) & 0x7;
233 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
234 sizeof(m), &m))
235 goto nla_put_failure;
236 }
237 }
238 nla_nest_end(skb, nest);
239 }
240 return 0;
241
242 nla_put_failure:
243 return -EMSGSIZE;
244 }
245
vlan_get_link_net(const struct net_device * dev)246 static struct net *vlan_get_link_net(const struct net_device *dev)
247 {
248 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
249
250 return dev_net(real_dev);
251 }
252
253 struct rtnl_link_ops vlan_link_ops __read_mostly = {
254 .kind = "vlan",
255 .maxtype = IFLA_VLAN_MAX,
256 .policy = vlan_policy,
257 .priv_size = sizeof(struct vlan_dev_priv),
258 .setup = vlan_setup,
259 .validate = vlan_validate,
260 .newlink = vlan_newlink,
261 .changelink = vlan_changelink,
262 .dellink = unregister_vlan_dev,
263 .get_size = vlan_get_size,
264 .fill_info = vlan_fill_info,
265 .get_link_net = vlan_get_link_net,
266 };
267
vlan_netlink_init(void)268 int __init vlan_netlink_init(void)
269 {
270 return rtnl_link_register(&vlan_link_ops);
271 }
272
vlan_netlink_fini(void)273 void __exit vlan_netlink_fini(void)
274 {
275 rtnl_link_unregister(&vlan_link_ops);
276 }
277
278 MODULE_ALIAS_RTNL_LINK("vlan");
279