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07b5b17e PM |
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> | |
3a9a231d | 14 | #include <linux/module.h> |
881d966b | 15 | #include <net/net_namespace.h> |
07b5b17e PM |
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 }, | |
8ad227ff | 26 | [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 }, |
07b5b17e PM |
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 | ||
34 | static inline int vlan_validate_qos_map(struct nlattr *attr) | |
35 | { | |
36 | if (!attr) | |
37 | return 0; | |
fceb6435 JB |
38 | return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy, |
39 | NULL); | |
07b5b17e PM |
40 | } |
41 | ||
a8b8a889 MS |
42 | static int vlan_validate(struct nlattr *tb[], struct nlattr *data[], |
43 | struct netlink_ext_ack *extack) | |
07b5b17e PM |
44 | { |
45 | struct ifla_vlan_flags *flags; | |
46 | u16 id; | |
47 | int err; | |
48 | ||
0e06877c | 49 | if (tb[IFLA_ADDRESS]) { |
33fa3823 DA |
50 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
51 | NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); | |
0e06877c | 52 | return -EINVAL; |
33fa3823 DA |
53 | } |
54 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
55 | NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); | |
0e06877c | 56 | return -EADDRNOTAVAIL; |
33fa3823 | 57 | } |
0e06877c PM |
58 | } |
59 | ||
33fa3823 DA |
60 | if (!data) { |
61 | NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified"); | |
07b5b17e | 62 | return -EINVAL; |
33fa3823 | 63 | } |
07b5b17e | 64 | |
8ad227ff PM |
65 | if (data[IFLA_VLAN_PROTOCOL]) { |
66 | switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { | |
f0e78826 JP |
67 | case htons(ETH_P_8021Q): |
68 | case htons(ETH_P_8021AD): | |
8ad227ff PM |
69 | break; |
70 | default: | |
33fa3823 | 71 | NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol"); |
8ad227ff PM |
72 | return -EPROTONOSUPPORT; |
73 | } | |
74 | } | |
75 | ||
07b5b17e PM |
76 | if (data[IFLA_VLAN_ID]) { |
77 | id = nla_get_u16(data[IFLA_VLAN_ID]); | |
33fa3823 DA |
78 | if (id >= VLAN_VID_MASK) { |
79 | NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id"); | |
07b5b17e | 80 | return -ERANGE; |
33fa3823 | 81 | } |
07b5b17e PM |
82 | } |
83 | if (data[IFLA_VLAN_FLAGS]) { | |
84 | flags = nla_data(data[IFLA_VLAN_FLAGS]); | |
70c03b49 | 85 | if ((flags->flags & flags->mask) & |
5e756593 | 86 | ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | |
33fa3823 DA |
87 | VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) { |
88 | NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags"); | |
07b5b17e | 89 | return -EINVAL; |
33fa3823 | 90 | } |
07b5b17e PM |
91 | } |
92 | ||
93 | err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); | |
33fa3823 DA |
94 | if (err < 0) { |
95 | NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map"); | |
07b5b17e | 96 | return err; |
33fa3823 | 97 | } |
07b5b17e | 98 | err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); |
33fa3823 DA |
99 | if (err < 0) { |
100 | NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map"); | |
07b5b17e | 101 | return err; |
33fa3823 | 102 | } |
07b5b17e PM |
103 | return 0; |
104 | } | |
105 | ||
ad744b22 MS |
106 | static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], |
107 | struct nlattr *data[], | |
108 | struct netlink_ext_ack *extack) | |
07b5b17e | 109 | { |
07b5b17e PM |
110 | struct ifla_vlan_flags *flags; |
111 | struct ifla_vlan_qos_mapping *m; | |
112 | struct nlattr *attr; | |
113 | int rem; | |
114 | ||
115 | if (data[IFLA_VLAN_FLAGS]) { | |
116 | flags = nla_data(data[IFLA_VLAN_FLAGS]); | |
b3ce0325 | 117 | vlan_dev_change_flags(dev, flags->flags, flags->mask); |
07b5b17e PM |
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 | vlan_dev_set_egress_priority(dev, m->from, m->to); | |
129 | } | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
81adee47 | 134 | static int vlan_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
135 | struct nlattr *tb[], struct nlattr *data[], |
136 | struct netlink_ext_ack *extack) | |
07b5b17e | 137 | { |
7da82c06 | 138 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e | 139 | struct net_device *real_dev; |
18d3df3e | 140 | unsigned int max_mtu; |
8ad227ff | 141 | __be16 proto; |
07b5b17e PM |
142 | int err; |
143 | ||
33fa3823 DA |
144 | if (!data[IFLA_VLAN_ID]) { |
145 | NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); | |
07b5b17e | 146 | return -EINVAL; |
33fa3823 | 147 | } |
07b5b17e | 148 | |
33fa3823 DA |
149 | if (!tb[IFLA_LINK]) { |
150 | NL_SET_ERR_MSG_MOD(extack, "link not specified"); | |
07b5b17e | 151 | return -EINVAL; |
33fa3823 DA |
152 | } |
153 | ||
81adee47 | 154 | real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
33fa3823 DA |
155 | if (!real_dev) { |
156 | NL_SET_ERR_MSG_MOD(extack, "link does not exist"); | |
07b5b17e | 157 | return -ENODEV; |
33fa3823 | 158 | } |
07b5b17e | 159 | |
8ad227ff PM |
160 | if (data[IFLA_VLAN_PROTOCOL]) |
161 | proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); | |
162 | else | |
163 | proto = htons(ETH_P_8021Q); | |
164 | ||
165 | vlan->vlan_proto = proto; | |
1fd9b1fc PM |
166 | vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); |
167 | vlan->real_dev = real_dev; | |
9d917c20 | 168 | dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); |
1fd9b1fc | 169 | vlan->flags = VLAN_FLAG_REORDER_HDR; |
07b5b17e | 170 | |
33fa3823 DA |
171 | err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, |
172 | extack); | |
07b5b17e PM |
173 | if (err < 0) |
174 | return err; | |
175 | ||
18d3df3e PA |
176 | max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : |
177 | real_dev->mtu; | |
07b5b17e | 178 | if (!tb[IFLA_MTU]) |
18d3df3e PA |
179 | dev->mtu = max_mtu; |
180 | else if (dev->mtu > max_mtu) | |
07b5b17e PM |
181 | return -EINVAL; |
182 | ||
ad744b22 | 183 | err = vlan_changelink(dev, tb, data, extack); |
07b5b17e PM |
184 | if (err < 0) |
185 | return err; | |
186 | ||
42ab19ee | 187 | return register_vlan_dev(dev, extack); |
07b5b17e PM |
188 | } |
189 | ||
07b5b17e PM |
190 | static inline size_t vlan_qos_map_size(unsigned int n) |
191 | { | |
192 | if (n == 0) | |
193 | return 0; | |
194 | /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ | |
195 | return nla_total_size(sizeof(struct nlattr)) + | |
196 | nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; | |
197 | } | |
198 | ||
199 | static size_t vlan_get_size(const struct net_device *dev) | |
200 | { | |
7da82c06 | 201 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e | 202 | |
8ad227ff PM |
203 | return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ |
204 | nla_total_size(2) + /* IFLA_VLAN_ID */ | |
c33a39c5 | 205 | nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ |
07b5b17e PM |
206 | vlan_qos_map_size(vlan->nr_ingress_mappings) + |
207 | vlan_qos_map_size(vlan->nr_egress_mappings); | |
208 | } | |
209 | ||
210 | static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
211 | { | |
7da82c06 | 212 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e PM |
213 | struct vlan_priority_tci_mapping *pm; |
214 | struct ifla_vlan_flags f; | |
215 | struct ifla_vlan_qos_mapping m; | |
216 | struct nlattr *nest; | |
217 | unsigned int i; | |
218 | ||
8ad227ff PM |
219 | if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || |
220 | nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) | |
61849dda | 221 | goto nla_put_failure; |
07b5b17e PM |
222 | if (vlan->flags) { |
223 | f.flags = vlan->flags; | |
224 | f.mask = ~0; | |
61849dda DM |
225 | if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) |
226 | goto nla_put_failure; | |
07b5b17e PM |
227 | } |
228 | if (vlan->nr_ingress_mappings) { | |
229 | nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); | |
230 | if (nest == NULL) | |
231 | goto nla_put_failure; | |
232 | ||
233 | for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { | |
234 | if (!vlan->ingress_priority_map[i]) | |
235 | continue; | |
236 | ||
237 | m.from = i; | |
238 | m.to = vlan->ingress_priority_map[i]; | |
61849dda DM |
239 | if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
240 | sizeof(m), &m)) | |
241 | goto nla_put_failure; | |
07b5b17e PM |
242 | } |
243 | nla_nest_end(skb, nest); | |
244 | } | |
245 | ||
246 | if (vlan->nr_egress_mappings) { | |
247 | nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); | |
248 | if (nest == NULL) | |
249 | goto nla_put_failure; | |
250 | ||
251 | for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { | |
252 | for (pm = vlan->egress_priority_map[i]; pm; | |
253 | pm = pm->next) { | |
254 | if (!pm->vlan_qos) | |
255 | continue; | |
256 | ||
257 | m.from = pm->priority; | |
258 | m.to = (pm->vlan_qos >> 13) & 0x7; | |
61849dda DM |
259 | if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
260 | sizeof(m), &m)) | |
261 | goto nla_put_failure; | |
07b5b17e PM |
262 | } |
263 | } | |
264 | nla_nest_end(skb, nest); | |
265 | } | |
266 | return 0; | |
267 | ||
268 | nla_put_failure: | |
269 | return -EMSGSIZE; | |
270 | } | |
271 | ||
1f17257b ND |
272 | static struct net *vlan_get_link_net(const struct net_device *dev) |
273 | { | |
274 | struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; | |
275 | ||
276 | return dev_net(real_dev); | |
277 | } | |
278 | ||
07b5b17e PM |
279 | struct rtnl_link_ops vlan_link_ops __read_mostly = { |
280 | .kind = "vlan", | |
281 | .maxtype = IFLA_VLAN_MAX, | |
282 | .policy = vlan_policy, | |
7da82c06 | 283 | .priv_size = sizeof(struct vlan_dev_priv), |
07b5b17e PM |
284 | .setup = vlan_setup, |
285 | .validate = vlan_validate, | |
286 | .newlink = vlan_newlink, | |
287 | .changelink = vlan_changelink, | |
af301517 | 288 | .dellink = unregister_vlan_dev, |
07b5b17e PM |
289 | .get_size = vlan_get_size, |
290 | .fill_info = vlan_fill_info, | |
1f17257b | 291 | .get_link_net = vlan_get_link_net, |
07b5b17e PM |
292 | }; |
293 | ||
294 | int __init vlan_netlink_init(void) | |
295 | { | |
296 | return rtnl_link_register(&vlan_link_ops); | |
297 | } | |
298 | ||
299 | void __exit vlan_netlink_fini(void) | |
300 | { | |
301 | rtnl_link_unregister(&vlan_link_ops); | |
302 | } | |
303 | ||
304 | MODULE_ALIAS_RTNL_LINK("vlan"); |