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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 PM |
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 | ||
07b5b17e PM |
56 | if (!data) |
57 | return -EINVAL; | |
58 | ||
8ad227ff PM |
59 | if (data[IFLA_VLAN_PROTOCOL]) { |
60 | switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { | |
f0e78826 JP |
61 | case htons(ETH_P_8021Q): |
62 | case htons(ETH_P_8021AD): | |
8ad227ff PM |
63 | break; |
64 | default: | |
65 | return -EPROTONOSUPPORT; | |
66 | } | |
67 | } | |
68 | ||
07b5b17e PM |
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]); | |
70c03b49 | 76 | if ((flags->flags & flags->mask) & |
5e756593 | 77 | ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | |
86fbe9bb | 78 | VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) |
07b5b17e PM |
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 | ||
ad744b22 MS |
91 | static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], |
92 | struct nlattr *data[], | |
93 | struct netlink_ext_ack *extack) | |
07b5b17e | 94 | { |
07b5b17e PM |
95 | struct ifla_vlan_flags *flags; |
96 | struct ifla_vlan_qos_mapping *m; | |
97 | struct nlattr *attr; | |
98 | int rem; | |
99 | ||
100 | if (data[IFLA_VLAN_FLAGS]) { | |
101 | flags = nla_data(data[IFLA_VLAN_FLAGS]); | |
b3ce0325 | 102 | vlan_dev_change_flags(dev, flags->flags, flags->mask); |
07b5b17e PM |
103 | } |
104 | if (data[IFLA_VLAN_INGRESS_QOS]) { | |
105 | nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { | |
106 | m = nla_data(attr); | |
107 | vlan_dev_set_ingress_priority(dev, m->to, m->from); | |
108 | } | |
109 | } | |
110 | if (data[IFLA_VLAN_EGRESS_QOS]) { | |
111 | nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { | |
112 | m = nla_data(attr); | |
113 | vlan_dev_set_egress_priority(dev, m->from, m->to); | |
114 | } | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
81adee47 | 119 | static int vlan_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
120 | struct nlattr *tb[], struct nlattr *data[], |
121 | struct netlink_ext_ack *extack) | |
07b5b17e | 122 | { |
7da82c06 | 123 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e | 124 | struct net_device *real_dev; |
18d3df3e | 125 | unsigned int max_mtu; |
8ad227ff | 126 | __be16 proto; |
07b5b17e PM |
127 | int err; |
128 | ||
129 | if (!data[IFLA_VLAN_ID]) | |
130 | return -EINVAL; | |
131 | ||
132 | if (!tb[IFLA_LINK]) | |
133 | return -EINVAL; | |
81adee47 | 134 | real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
07b5b17e PM |
135 | if (!real_dev) |
136 | return -ENODEV; | |
137 | ||
8ad227ff PM |
138 | if (data[IFLA_VLAN_PROTOCOL]) |
139 | proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); | |
140 | else | |
141 | proto = htons(ETH_P_8021Q); | |
142 | ||
143 | vlan->vlan_proto = proto; | |
1fd9b1fc PM |
144 | vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); |
145 | vlan->real_dev = real_dev; | |
9d917c20 | 146 | dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); |
1fd9b1fc | 147 | vlan->flags = VLAN_FLAG_REORDER_HDR; |
07b5b17e | 148 | |
1fd9b1fc | 149 | err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id); |
07b5b17e PM |
150 | if (err < 0) |
151 | return err; | |
152 | ||
18d3df3e PA |
153 | max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : |
154 | real_dev->mtu; | |
07b5b17e | 155 | if (!tb[IFLA_MTU]) |
18d3df3e PA |
156 | dev->mtu = max_mtu; |
157 | else if (dev->mtu > max_mtu) | |
07b5b17e PM |
158 | return -EINVAL; |
159 | ||
ad744b22 | 160 | err = vlan_changelink(dev, tb, data, extack); |
07b5b17e PM |
161 | if (err < 0) |
162 | return err; | |
163 | ||
42ab19ee | 164 | return register_vlan_dev(dev, extack); |
07b5b17e PM |
165 | } |
166 | ||
07b5b17e PM |
167 | static inline size_t vlan_qos_map_size(unsigned int n) |
168 | { | |
169 | if (n == 0) | |
170 | return 0; | |
171 | /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ | |
172 | return nla_total_size(sizeof(struct nlattr)) + | |
173 | nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; | |
174 | } | |
175 | ||
176 | static size_t vlan_get_size(const struct net_device *dev) | |
177 | { | |
7da82c06 | 178 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e | 179 | |
8ad227ff PM |
180 | return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ |
181 | nla_total_size(2) + /* IFLA_VLAN_ID */ | |
c33a39c5 | 182 | nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ |
07b5b17e PM |
183 | vlan_qos_map_size(vlan->nr_ingress_mappings) + |
184 | vlan_qos_map_size(vlan->nr_egress_mappings); | |
185 | } | |
186 | ||
187 | static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
188 | { | |
7da82c06 | 189 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
07b5b17e PM |
190 | struct vlan_priority_tci_mapping *pm; |
191 | struct ifla_vlan_flags f; | |
192 | struct ifla_vlan_qos_mapping m; | |
193 | struct nlattr *nest; | |
194 | unsigned int i; | |
195 | ||
8ad227ff PM |
196 | if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || |
197 | nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) | |
61849dda | 198 | goto nla_put_failure; |
07b5b17e PM |
199 | if (vlan->flags) { |
200 | f.flags = vlan->flags; | |
201 | f.mask = ~0; | |
61849dda DM |
202 | if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) |
203 | goto nla_put_failure; | |
07b5b17e PM |
204 | } |
205 | if (vlan->nr_ingress_mappings) { | |
206 | nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); | |
207 | if (nest == NULL) | |
208 | goto nla_put_failure; | |
209 | ||
210 | for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { | |
211 | if (!vlan->ingress_priority_map[i]) | |
212 | continue; | |
213 | ||
214 | m.from = i; | |
215 | m.to = vlan->ingress_priority_map[i]; | |
61849dda DM |
216 | if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
217 | sizeof(m), &m)) | |
218 | goto nla_put_failure; | |
07b5b17e PM |
219 | } |
220 | nla_nest_end(skb, nest); | |
221 | } | |
222 | ||
223 | if (vlan->nr_egress_mappings) { | |
224 | nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); | |
225 | if (nest == NULL) | |
226 | goto nla_put_failure; | |
227 | ||
228 | for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { | |
229 | for (pm = vlan->egress_priority_map[i]; pm; | |
230 | pm = pm->next) { | |
231 | if (!pm->vlan_qos) | |
232 | continue; | |
233 | ||
234 | m.from = pm->priority; | |
235 | m.to = (pm->vlan_qos >> 13) & 0x7; | |
61849dda DM |
236 | if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
237 | sizeof(m), &m)) | |
238 | goto nla_put_failure; | |
07b5b17e PM |
239 | } |
240 | } | |
241 | nla_nest_end(skb, nest); | |
242 | } | |
243 | return 0; | |
244 | ||
245 | nla_put_failure: | |
246 | return -EMSGSIZE; | |
247 | } | |
248 | ||
1f17257b ND |
249 | static struct net *vlan_get_link_net(const struct net_device *dev) |
250 | { | |
251 | struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; | |
252 | ||
253 | return dev_net(real_dev); | |
254 | } | |
255 | ||
07b5b17e PM |
256 | struct rtnl_link_ops vlan_link_ops __read_mostly = { |
257 | .kind = "vlan", | |
258 | .maxtype = IFLA_VLAN_MAX, | |
259 | .policy = vlan_policy, | |
7da82c06 | 260 | .priv_size = sizeof(struct vlan_dev_priv), |
07b5b17e PM |
261 | .setup = vlan_setup, |
262 | .validate = vlan_validate, | |
263 | .newlink = vlan_newlink, | |
264 | .changelink = vlan_changelink, | |
af301517 | 265 | .dellink = unregister_vlan_dev, |
07b5b17e PM |
266 | .get_size = vlan_get_size, |
267 | .fill_info = vlan_fill_info, | |
1f17257b | 268 | .get_link_net = vlan_get_link_net, |
07b5b17e PM |
269 | }; |
270 | ||
271 | int __init vlan_netlink_init(void) | |
272 | { | |
273 | return rtnl_link_register(&vlan_link_ops); | |
274 | } | |
275 | ||
276 | void __exit vlan_netlink_fini(void) | |
277 | { | |
278 | rtnl_link_unregister(&vlan_link_ops); | |
279 | } | |
280 | ||
281 | MODULE_ALIAS_RTNL_LINK("vlan"); |