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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> | |
881d966b | 14 | #include <net/net_namespace.h> |
07b5b17e PM |
15 | #include <net/netlink.h> |
16 | #include <net/rtnetlink.h> | |
17 | #include "vlan.h" | |
18 | ||
19 | ||
20 | static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = { | |
21 | [IFLA_VLAN_ID] = { .type = NLA_U16 }, | |
22 | [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) }, | |
23 | [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED }, | |
24 | [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED }, | |
25 | }; | |
26 | ||
27 | static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = { | |
28 | [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) }, | |
29 | }; | |
30 | ||
31 | ||
32 | static inline int vlan_validate_qos_map(struct nlattr *attr) | |
33 | { | |
34 | if (!attr) | |
35 | return 0; | |
36 | return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy); | |
37 | } | |
38 | ||
39 | static int vlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
40 | { | |
41 | struct ifla_vlan_flags *flags; | |
42 | u16 id; | |
43 | int err; | |
44 | ||
0e06877c PM |
45 | if (tb[IFLA_ADDRESS]) { |
46 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
47 | return -EINVAL; | |
48 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
49 | return -EADDRNOTAVAIL; | |
50 | } | |
51 | ||
07b5b17e PM |
52 | if (!data) |
53 | return -EINVAL; | |
54 | ||
55 | if (data[IFLA_VLAN_ID]) { | |
56 | id = nla_get_u16(data[IFLA_VLAN_ID]); | |
57 | if (id >= VLAN_VID_MASK) | |
58 | return -ERANGE; | |
59 | } | |
60 | if (data[IFLA_VLAN_FLAGS]) { | |
61 | flags = nla_data(data[IFLA_VLAN_FLAGS]); | |
70c03b49 | 62 | if ((flags->flags & flags->mask) & |
5e756593 PM |
63 | ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | |
64 | VLAN_FLAG_LOOSE_BINDING)) | |
07b5b17e PM |
65 | return -EINVAL; |
66 | } | |
67 | ||
68 | err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); | |
69 | if (err < 0) | |
70 | return err; | |
71 | err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); | |
72 | if (err < 0) | |
73 | return err; | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static int vlan_changelink(struct net_device *dev, | |
78 | struct nlattr *tb[], struct nlattr *data[]) | |
79 | { | |
07b5b17e PM |
80 | struct ifla_vlan_flags *flags; |
81 | struct ifla_vlan_qos_mapping *m; | |
82 | struct nlattr *attr; | |
83 | int rem; | |
84 | ||
85 | if (data[IFLA_VLAN_FLAGS]) { | |
86 | flags = nla_data(data[IFLA_VLAN_FLAGS]); | |
b3ce0325 | 87 | vlan_dev_change_flags(dev, flags->flags, flags->mask); |
07b5b17e PM |
88 | } |
89 | if (data[IFLA_VLAN_INGRESS_QOS]) { | |
90 | nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { | |
91 | m = nla_data(attr); | |
92 | vlan_dev_set_ingress_priority(dev, m->to, m->from); | |
93 | } | |
94 | } | |
95 | if (data[IFLA_VLAN_EGRESS_QOS]) { | |
96 | nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { | |
97 | m = nla_data(attr); | |
98 | vlan_dev_set_egress_priority(dev, m->from, m->to); | |
99 | } | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
2e59af3d ED |
104 | static int vlan_get_tx_queues(struct net *net, |
105 | struct nlattr *tb[], | |
106 | unsigned int *num_tx_queues, | |
107 | unsigned int *real_num_tx_queues) | |
108 | { | |
109 | struct net_device *real_dev; | |
110 | ||
111 | if (!tb[IFLA_LINK]) | |
112 | return -EINVAL; | |
113 | ||
114 | real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); | |
115 | if (!real_dev) | |
116 | return -ENODEV; | |
117 | ||
118 | *num_tx_queues = real_dev->num_tx_queues; | |
119 | *real_num_tx_queues = real_dev->real_num_tx_queues; | |
120 | return 0; | |
121 | } | |
122 | ||
81adee47 | 123 | static int vlan_newlink(struct net *src_net, struct net_device *dev, |
07b5b17e PM |
124 | struct nlattr *tb[], struct nlattr *data[]) |
125 | { | |
9dfebcc6 | 126 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
07b5b17e PM |
127 | struct net_device *real_dev; |
128 | int err; | |
129 | ||
130 | if (!data[IFLA_VLAN_ID]) | |
131 | return -EINVAL; | |
132 | ||
133 | if (!tb[IFLA_LINK]) | |
134 | return -EINVAL; | |
81adee47 | 135 | real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
07b5b17e PM |
136 | if (!real_dev) |
137 | return -ENODEV; | |
138 | ||
139 | vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); | |
140 | vlan->real_dev = real_dev; | |
141 | vlan->flags = VLAN_FLAG_REORDER_HDR; | |
142 | ||
143 | err = vlan_check_real_dev(real_dev, vlan->vlan_id); | |
144 | if (err < 0) | |
145 | return err; | |
146 | ||
147 | if (!tb[IFLA_MTU]) | |
148 | dev->mtu = real_dev->mtu; | |
149 | else if (dev->mtu > real_dev->mtu) | |
150 | return -EINVAL; | |
151 | ||
152 | err = vlan_changelink(dev, tb, data); | |
153 | if (err < 0) | |
154 | return err; | |
155 | ||
156 | return register_vlan_dev(dev); | |
157 | } | |
158 | ||
07b5b17e PM |
159 | static inline size_t vlan_qos_map_size(unsigned int n) |
160 | { | |
161 | if (n == 0) | |
162 | return 0; | |
163 | /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ | |
164 | return nla_total_size(sizeof(struct nlattr)) + | |
165 | nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; | |
166 | } | |
167 | ||
168 | static size_t vlan_get_size(const struct net_device *dev) | |
169 | { | |
9dfebcc6 | 170 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
07b5b17e PM |
171 | |
172 | return nla_total_size(2) + /* IFLA_VLAN_ID */ | |
fc482cc5 | 173 | sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */ |
07b5b17e PM |
174 | vlan_qos_map_size(vlan->nr_ingress_mappings) + |
175 | vlan_qos_map_size(vlan->nr_egress_mappings); | |
176 | } | |
177 | ||
178 | static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
179 | { | |
9dfebcc6 | 180 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
07b5b17e PM |
181 | struct vlan_priority_tci_mapping *pm; |
182 | struct ifla_vlan_flags f; | |
183 | struct ifla_vlan_qos_mapping m; | |
184 | struct nlattr *nest; | |
185 | unsigned int i; | |
186 | ||
9dfebcc6 | 187 | NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id); |
07b5b17e PM |
188 | if (vlan->flags) { |
189 | f.flags = vlan->flags; | |
190 | f.mask = ~0; | |
191 | NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f); | |
192 | } | |
193 | if (vlan->nr_ingress_mappings) { | |
194 | nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); | |
195 | if (nest == NULL) | |
196 | goto nla_put_failure; | |
197 | ||
198 | for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { | |
199 | if (!vlan->ingress_priority_map[i]) | |
200 | continue; | |
201 | ||
202 | m.from = i; | |
203 | m.to = vlan->ingress_priority_map[i]; | |
204 | NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, | |
205 | sizeof(m), &m); | |
206 | } | |
207 | nla_nest_end(skb, nest); | |
208 | } | |
209 | ||
210 | if (vlan->nr_egress_mappings) { | |
211 | nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); | |
212 | if (nest == NULL) | |
213 | goto nla_put_failure; | |
214 | ||
215 | for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { | |
216 | for (pm = vlan->egress_priority_map[i]; pm; | |
217 | pm = pm->next) { | |
218 | if (!pm->vlan_qos) | |
219 | continue; | |
220 | ||
221 | m.from = pm->priority; | |
222 | m.to = (pm->vlan_qos >> 13) & 0x7; | |
223 | NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, | |
224 | sizeof(m), &m); | |
225 | } | |
226 | } | |
227 | nla_nest_end(skb, nest); | |
228 | } | |
229 | return 0; | |
230 | ||
231 | nla_put_failure: | |
232 | return -EMSGSIZE; | |
233 | } | |
234 | ||
235 | struct rtnl_link_ops vlan_link_ops __read_mostly = { | |
236 | .kind = "vlan", | |
237 | .maxtype = IFLA_VLAN_MAX, | |
238 | .policy = vlan_policy, | |
239 | .priv_size = sizeof(struct vlan_dev_info), | |
2e59af3d | 240 | .get_tx_queues = vlan_get_tx_queues, |
07b5b17e PM |
241 | .setup = vlan_setup, |
242 | .validate = vlan_validate, | |
243 | .newlink = vlan_newlink, | |
244 | .changelink = vlan_changelink, | |
af301517 | 245 | .dellink = unregister_vlan_dev, |
07b5b17e PM |
246 | .get_size = vlan_get_size, |
247 | .fill_info = vlan_fill_info, | |
248 | }; | |
249 | ||
250 | int __init vlan_netlink_init(void) | |
251 | { | |
252 | return rtnl_link_register(&vlan_link_ops); | |
253 | } | |
254 | ||
255 | void __exit vlan_netlink_fini(void) | |
256 | { | |
257 | rtnl_link_unregister(&vlan_link_ops); | |
258 | } | |
259 | ||
260 | MODULE_ALIAS_RTNL_LINK("vlan"); |