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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
07b5b17e PM |
2 | /* |
3 | * VLAN netlink control interface | |
4 | * | |
5 | * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> | |
07b5b17e PM |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/netdevice.h> | |
10 | #include <linux/if_vlan.h> | |
3a9a231d | 11 | #include <linux/module.h> |
881d966b | 12 | #include <net/net_namespace.h> |
07b5b17e PM |
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 }, | |
8ad227ff | 23 | [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 }, |
07b5b17e PM |
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 | ||
31 | static inline int vlan_validate_qos_map(struct nlattr *attr) | |
32 | { | |
33 | if (!attr) | |
34 | return 0; | |
8cb08174 JB |
35 | return nla_validate_nested_deprecated(attr, IFLA_VLAN_QOS_MAX, |
36 | vlan_map_policy, NULL); | |
07b5b17e PM |
37 | } |
38 | ||
a8b8a889 MS |
39 | static int vlan_validate(struct nlattr *tb[], struct nlattr *data[], |
40 | struct netlink_ext_ack *extack) | |
07b5b17e PM |
41 | { |
42 | struct ifla_vlan_flags *flags; | |
43 | u16 id; | |
44 | int err; | |
45 | ||
0e06877c | 46 | if (tb[IFLA_ADDRESS]) { |
33fa3823 DA |
47 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
48 | NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); | |
0e06877c | 49 | return -EINVAL; |
33fa3823 DA |
50 | } |
51 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
52 | NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); | |
0e06877c | 53 | return -EADDRNOTAVAIL; |
33fa3823 | 54 | } |
0e06877c PM |
55 | } |
56 | ||
33fa3823 DA |
57 | if (!data) { |
58 | NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified"); | |
07b5b17e | 59 | return -EINVAL; |
33fa3823 | 60 | } |
07b5b17e | 61 | |
8ad227ff PM |
62 | if (data[IFLA_VLAN_PROTOCOL]) { |
63 | switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { | |
f0e78826 JP |
64 | case htons(ETH_P_8021Q): |
65 | case htons(ETH_P_8021AD): | |
8ad227ff PM |
66 | break; |
67 | default: | |
33fa3823 | 68 | NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol"); |
8ad227ff PM |
69 | return -EPROTONOSUPPORT; |
70 | } | |
71 | } | |
72 | ||
07b5b17e PM |
73 | if (data[IFLA_VLAN_ID]) { |
74 | id = nla_get_u16(data[IFLA_VLAN_ID]); | |
33fa3823 DA |
75 | if (id >= VLAN_VID_MASK) { |
76 | NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id"); | |
07b5b17e | 77 | return -ERANGE; |
33fa3823 | 78 | } |
07b5b17e PM |
79 | } |
80 | if (data[IFLA_VLAN_FLAGS]) { | |
81 | flags = nla_data(data[IFLA_VLAN_FLAGS]); | |
70c03b49 | 82 | if ((flags->flags & flags->mask) & |
5e756593 | 83 | ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | |
8c8b3458 MM |
84 | VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP | |
85 | VLAN_FLAG_BRIDGE_BINDING)) { | |
33fa3823 | 86 | NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags"); |
07b5b17e | 87 | return -EINVAL; |
33fa3823 | 88 | } |
07b5b17e PM |
89 | } |
90 | ||
91 | err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); | |
33fa3823 DA |
92 | if (err < 0) { |
93 | NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map"); | |
07b5b17e | 94 | return err; |
33fa3823 | 95 | } |
07b5b17e | 96 | err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); |
33fa3823 DA |
97 | if (err < 0) { |
98 | NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map"); | |
07b5b17e | 99 | return err; |
33fa3823 | 100 | } |
07b5b17e PM |
101 | return 0; |
102 | } | |
103 | ||
ad744b22 MS |
104 | static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], |
105 | struct nlattr *data[], | |
106 | struct netlink_ext_ack *extack) | |
07b5b17e | 107 | { |
07b5b17e PM |
108 | struct ifla_vlan_flags *flags; |
109 | struct ifla_vlan_qos_mapping *m; | |
110 | struct nlattr *attr; | |
eb8ef2a3 | 111 | int rem, err; |
07b5b17e PM |
112 | |
113 | if (data[IFLA_VLAN_FLAGS]) { | |
114 | flags = nla_data(data[IFLA_VLAN_FLAGS]); | |
eb8ef2a3 ED |
115 | err = vlan_dev_change_flags(dev, flags->flags, flags->mask); |
116 | if (err) | |
117 | return err; | |
07b5b17e PM |
118 | } |
119 | if (data[IFLA_VLAN_INGRESS_QOS]) { | |
120 | nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { | |
6c21660f LM |
121 | if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING) |
122 | continue; | |
07b5b17e PM |
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) { | |
6c21660f LM |
129 | if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING) |
130 | continue; | |
07b5b17e | 131 | m = nla_data(attr); |
eb8ef2a3 ED |
132 | err = vlan_dev_set_egress_priority(dev, m->from, m->to); |
133 | if (err) | |
134 | return err; | |
07b5b17e PM |
135 | } |
136 | } | |
137 | return 0; | |
138 | } | |
139 | ||
81adee47 | 140 | static int vlan_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
141 | struct nlattr *tb[], struct nlattr *data[], |
142 | struct netlink_ext_ack *extack) | |
07b5b17e | 143 | { |
7da82c06 | 144 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e | 145 | struct net_device *real_dev; |
18d3df3e | 146 | unsigned int max_mtu; |
8ad227ff | 147 | __be16 proto; |
07b5b17e PM |
148 | int err; |
149 | ||
33fa3823 DA |
150 | if (!data[IFLA_VLAN_ID]) { |
151 | NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); | |
07b5b17e | 152 | return -EINVAL; |
33fa3823 | 153 | } |
07b5b17e | 154 | |
33fa3823 DA |
155 | if (!tb[IFLA_LINK]) { |
156 | NL_SET_ERR_MSG_MOD(extack, "link not specified"); | |
07b5b17e | 157 | return -EINVAL; |
33fa3823 DA |
158 | } |
159 | ||
81adee47 | 160 | real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
33fa3823 DA |
161 | if (!real_dev) { |
162 | NL_SET_ERR_MSG_MOD(extack, "link does not exist"); | |
07b5b17e | 163 | return -ENODEV; |
33fa3823 | 164 | } |
07b5b17e | 165 | |
8ad227ff PM |
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; | |
1fd9b1fc PM |
172 | vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); |
173 | vlan->real_dev = real_dev; | |
9d917c20 | 174 | dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); |
1fd9b1fc | 175 | vlan->flags = VLAN_FLAG_REORDER_HDR; |
07b5b17e | 176 | |
33fa3823 DA |
177 | err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, |
178 | extack); | |
07b5b17e PM |
179 | if (err < 0) |
180 | return err; | |
181 | ||
18d3df3e PA |
182 | max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : |
183 | real_dev->mtu; | |
07b5b17e | 184 | if (!tb[IFLA_MTU]) |
18d3df3e PA |
185 | dev->mtu = max_mtu; |
186 | else if (dev->mtu > max_mtu) | |
07b5b17e PM |
187 | return -EINVAL; |
188 | ||
72a0b329 ED |
189 | /* Note: If this initial vlan_changelink() fails, we need |
190 | * to call vlan_dev_free_egress_priority() to free memory. | |
191 | */ | |
ad744b22 | 192 | err = vlan_changelink(dev, tb, data, extack); |
72a0b329 ED |
193 | |
194 | if (!err) | |
195 | err = register_vlan_dev(dev, extack); | |
196 | ||
37aa50c5 XL |
197 | if (err) |
198 | vlan_dev_free_egress_priority(dev); | |
9bbd917e | 199 | return err; |
07b5b17e PM |
200 | } |
201 | ||
07b5b17e PM |
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 | ||
211 | static size_t vlan_get_size(const struct net_device *dev) | |
212 | { | |
7da82c06 | 213 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e | 214 | |
8ad227ff PM |
215 | return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ |
216 | nla_total_size(2) + /* IFLA_VLAN_ID */ | |
c33a39c5 | 217 | nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ |
07b5b17e PM |
218 | vlan_qos_map_size(vlan->nr_ingress_mappings) + |
219 | vlan_qos_map_size(vlan->nr_egress_mappings); | |
220 | } | |
221 | ||
222 | static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
223 | { | |
7da82c06 | 224 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e PM |
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 | ||
8ad227ff PM |
231 | if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || |
232 | nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) | |
61849dda | 233 | goto nla_put_failure; |
07b5b17e PM |
234 | if (vlan->flags) { |
235 | f.flags = vlan->flags; | |
236 | f.mask = ~0; | |
61849dda DM |
237 | if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) |
238 | goto nla_put_failure; | |
07b5b17e PM |
239 | } |
240 | if (vlan->nr_ingress_mappings) { | |
ae0be8de | 241 | nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS); |
07b5b17e PM |
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]; | |
61849dda DM |
251 | if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
252 | sizeof(m), &m)) | |
253 | goto nla_put_failure; | |
07b5b17e PM |
254 | } |
255 | nla_nest_end(skb, nest); | |
256 | } | |
257 | ||
258 | if (vlan->nr_egress_mappings) { | |
ae0be8de | 259 | nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS); |
07b5b17e PM |
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; | |
61849dda DM |
271 | if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
272 | sizeof(m), &m)) | |
273 | goto nla_put_failure; | |
07b5b17e PM |
274 | } |
275 | } | |
276 | nla_nest_end(skb, nest); | |
277 | } | |
278 | return 0; | |
279 | ||
280 | nla_put_failure: | |
281 | return -EMSGSIZE; | |
282 | } | |
283 | ||
1f17257b ND |
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 | ||
07b5b17e PM |
291 | struct rtnl_link_ops vlan_link_ops __read_mostly = { |
292 | .kind = "vlan", | |
293 | .maxtype = IFLA_VLAN_MAX, | |
294 | .policy = vlan_policy, | |
7da82c06 | 295 | .priv_size = sizeof(struct vlan_dev_priv), |
07b5b17e PM |
296 | .setup = vlan_setup, |
297 | .validate = vlan_validate, | |
298 | .newlink = vlan_newlink, | |
299 | .changelink = vlan_changelink, | |
af301517 | 300 | .dellink = unregister_vlan_dev, |
07b5b17e PM |
301 | .get_size = vlan_get_size, |
302 | .fill_info = vlan_fill_info, | |
1f17257b | 303 | .get_link_net = vlan_get_link_net, |
07b5b17e PM |
304 | }; |
305 | ||
306 | int __init vlan_netlink_init(void) | |
307 | { | |
308 | return rtnl_link_register(&vlan_link_ops); | |
309 | } | |
310 | ||
311 | void __exit vlan_netlink_fini(void) | |
312 | { | |
313 | rtnl_link_unregister(&vlan_link_ops); | |
314 | } | |
315 | ||
316 | MODULE_ALIAS_RTNL_LINK("vlan"); |