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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) { | |
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); | |
eb8ef2a3 ED |
128 | err = vlan_dev_set_egress_priority(dev, m->from, m->to); |
129 | if (err) | |
130 | return err; | |
07b5b17e PM |
131 | } |
132 | } | |
133 | return 0; | |
134 | } | |
135 | ||
81adee47 | 136 | static int vlan_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
137 | struct nlattr *tb[], struct nlattr *data[], |
138 | struct netlink_ext_ack *extack) | |
07b5b17e | 139 | { |
7da82c06 | 140 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e | 141 | struct net_device *real_dev; |
18d3df3e | 142 | unsigned int max_mtu; |
8ad227ff | 143 | __be16 proto; |
07b5b17e PM |
144 | int err; |
145 | ||
33fa3823 DA |
146 | if (!data[IFLA_VLAN_ID]) { |
147 | NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); | |
07b5b17e | 148 | return -EINVAL; |
33fa3823 | 149 | } |
07b5b17e | 150 | |
33fa3823 DA |
151 | if (!tb[IFLA_LINK]) { |
152 | NL_SET_ERR_MSG_MOD(extack, "link not specified"); | |
07b5b17e | 153 | return -EINVAL; |
33fa3823 DA |
154 | } |
155 | ||
81adee47 | 156 | real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
33fa3823 DA |
157 | if (!real_dev) { |
158 | NL_SET_ERR_MSG_MOD(extack, "link does not exist"); | |
07b5b17e | 159 | return -ENODEV; |
33fa3823 | 160 | } |
07b5b17e | 161 | |
8ad227ff PM |
162 | if (data[IFLA_VLAN_PROTOCOL]) |
163 | proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); | |
164 | else | |
165 | proto = htons(ETH_P_8021Q); | |
166 | ||
167 | vlan->vlan_proto = proto; | |
1fd9b1fc PM |
168 | vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); |
169 | vlan->real_dev = real_dev; | |
9d917c20 | 170 | dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); |
1fd9b1fc | 171 | vlan->flags = VLAN_FLAG_REORDER_HDR; |
07b5b17e | 172 | |
33fa3823 DA |
173 | err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, |
174 | extack); | |
07b5b17e PM |
175 | if (err < 0) |
176 | return err; | |
177 | ||
18d3df3e PA |
178 | max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : |
179 | real_dev->mtu; | |
07b5b17e | 180 | if (!tb[IFLA_MTU]) |
18d3df3e PA |
181 | dev->mtu = max_mtu; |
182 | else if (dev->mtu > max_mtu) | |
07b5b17e PM |
183 | return -EINVAL; |
184 | ||
72a0b329 ED |
185 | /* Note: If this initial vlan_changelink() fails, we need |
186 | * to call vlan_dev_free_egress_priority() to free memory. | |
187 | */ | |
ad744b22 | 188 | err = vlan_changelink(dev, tb, data, extack); |
72a0b329 ED |
189 | |
190 | if (!err) | |
191 | err = register_vlan_dev(dev, extack); | |
192 | ||
37aa50c5 XL |
193 | if (err) |
194 | vlan_dev_free_egress_priority(dev); | |
9bbd917e | 195 | return err; |
07b5b17e PM |
196 | } |
197 | ||
07b5b17e PM |
198 | static inline size_t vlan_qos_map_size(unsigned int n) |
199 | { | |
200 | if (n == 0) | |
201 | return 0; | |
202 | /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ | |
203 | return nla_total_size(sizeof(struct nlattr)) + | |
204 | nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; | |
205 | } | |
206 | ||
207 | static size_t vlan_get_size(const struct net_device *dev) | |
208 | { | |
7da82c06 | 209 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e | 210 | |
8ad227ff PM |
211 | return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ |
212 | nla_total_size(2) + /* IFLA_VLAN_ID */ | |
c33a39c5 | 213 | nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ |
07b5b17e PM |
214 | vlan_qos_map_size(vlan->nr_ingress_mappings) + |
215 | vlan_qos_map_size(vlan->nr_egress_mappings); | |
216 | } | |
217 | ||
218 | static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
219 | { | |
7da82c06 | 220 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e PM |
221 | struct vlan_priority_tci_mapping *pm; |
222 | struct ifla_vlan_flags f; | |
223 | struct ifla_vlan_qos_mapping m; | |
224 | struct nlattr *nest; | |
225 | unsigned int i; | |
226 | ||
8ad227ff PM |
227 | if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || |
228 | nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) | |
61849dda | 229 | goto nla_put_failure; |
07b5b17e PM |
230 | if (vlan->flags) { |
231 | f.flags = vlan->flags; | |
232 | f.mask = ~0; | |
61849dda DM |
233 | if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) |
234 | goto nla_put_failure; | |
07b5b17e PM |
235 | } |
236 | if (vlan->nr_ingress_mappings) { | |
ae0be8de | 237 | nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS); |
07b5b17e PM |
238 | if (nest == NULL) |
239 | goto nla_put_failure; | |
240 | ||
241 | for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { | |
242 | if (!vlan->ingress_priority_map[i]) | |
243 | continue; | |
244 | ||
245 | m.from = i; | |
246 | m.to = vlan->ingress_priority_map[i]; | |
61849dda DM |
247 | if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
248 | sizeof(m), &m)) | |
249 | goto nla_put_failure; | |
07b5b17e PM |
250 | } |
251 | nla_nest_end(skb, nest); | |
252 | } | |
253 | ||
254 | if (vlan->nr_egress_mappings) { | |
ae0be8de | 255 | nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS); |
07b5b17e PM |
256 | if (nest == NULL) |
257 | goto nla_put_failure; | |
258 | ||
259 | for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { | |
260 | for (pm = vlan->egress_priority_map[i]; pm; | |
261 | pm = pm->next) { | |
262 | if (!pm->vlan_qos) | |
263 | continue; | |
264 | ||
265 | m.from = pm->priority; | |
266 | m.to = (pm->vlan_qos >> 13) & 0x7; | |
61849dda DM |
267 | if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
268 | sizeof(m), &m)) | |
269 | goto nla_put_failure; | |
07b5b17e PM |
270 | } |
271 | } | |
272 | nla_nest_end(skb, nest); | |
273 | } | |
274 | return 0; | |
275 | ||
276 | nla_put_failure: | |
277 | return -EMSGSIZE; | |
278 | } | |
279 | ||
1f17257b ND |
280 | static struct net *vlan_get_link_net(const struct net_device *dev) |
281 | { | |
282 | struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; | |
283 | ||
284 | return dev_net(real_dev); | |
285 | } | |
286 | ||
07b5b17e PM |
287 | struct rtnl_link_ops vlan_link_ops __read_mostly = { |
288 | .kind = "vlan", | |
289 | .maxtype = IFLA_VLAN_MAX, | |
290 | .policy = vlan_policy, | |
7da82c06 | 291 | .priv_size = sizeof(struct vlan_dev_priv), |
07b5b17e PM |
292 | .setup = vlan_setup, |
293 | .validate = vlan_validate, | |
294 | .newlink = vlan_newlink, | |
295 | .changelink = vlan_changelink, | |
af301517 | 296 | .dellink = unregister_vlan_dev, |
07b5b17e PM |
297 | .get_size = vlan_get_size, |
298 | .fill_info = vlan_fill_info, | |
1f17257b | 299 | .get_link_net = vlan_get_link_net, |
07b5b17e PM |
300 | }; |
301 | ||
302 | int __init vlan_netlink_init(void) | |
303 | { | |
304 | return rtnl_link_register(&vlan_link_ops); | |
305 | } | |
306 | ||
307 | void __exit vlan_netlink_fini(void) | |
308 | { | |
309 | rtnl_link_unregister(&vlan_link_ops); | |
310 | } | |
311 | ||
312 | MODULE_ALIAS_RTNL_LINK("vlan"); |