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>
14 #include <net/net_namespace.h>
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
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
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]);
62 if ((flags->flags & flags->mask) &
63 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
64 return -EINVAL;
65 }
66
67 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
68 if (err < 0)
69 return err;
70 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
71 if (err < 0)
72 return err;
73 return 0;
74 }
75
76 static int vlan_changelink(struct net_device *dev,
77 struct nlattr *tb[], struct nlattr *data[])
78 {
79 struct ifla_vlan_flags *flags;
80 struct ifla_vlan_qos_mapping *m;
81 struct nlattr *attr;
82 int rem;
83
84 if (data[IFLA_VLAN_FLAGS]) {
85 flags = nla_data(data[IFLA_VLAN_FLAGS]);
86 vlan_dev_change_flags(dev, flags->flags, flags->mask);
87 }
88 if (data[IFLA_VLAN_INGRESS_QOS]) {
89 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
90 m = nla_data(attr);
91 vlan_dev_set_ingress_priority(dev, m->to, m->from);
92 }
93 }
94 if (data[IFLA_VLAN_EGRESS_QOS]) {
95 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
96 m = nla_data(attr);
97 vlan_dev_set_egress_priority(dev, m->from, m->to);
98 }
99 }
100 return 0;
101 }
102
103 static int vlan_newlink(struct net_device *dev,
104 struct nlattr *tb[], struct nlattr *data[])
105 {
106 struct vlan_dev_info *vlan = vlan_dev_info(dev);
107 struct net_device *real_dev;
108 int err;
109
110 if (!data[IFLA_VLAN_ID])
111 return -EINVAL;
112
113 if (!tb[IFLA_LINK])
114 return -EINVAL;
115 real_dev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
116 if (!real_dev)
117 return -ENODEV;
118
119 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
120 vlan->real_dev = real_dev;
121 vlan->flags = VLAN_FLAG_REORDER_HDR;
122
123 err = vlan_check_real_dev(real_dev, vlan->vlan_id);
124 if (err < 0)
125 return err;
126
127 if (!tb[IFLA_MTU])
128 dev->mtu = real_dev->mtu;
129 else if (dev->mtu > real_dev->mtu)
130 return -EINVAL;
131
132 err = vlan_changelink(dev, tb, data);
133 if (err < 0)
134 return err;
135
136 return register_vlan_dev(dev);
137 }
138
139 static inline size_t vlan_qos_map_size(unsigned int n)
140 {
141 if (n == 0)
142 return 0;
143 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
144 return nla_total_size(sizeof(struct nlattr)) +
145 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
146 }
147
148 static size_t vlan_get_size(const struct net_device *dev)
149 {
150 struct vlan_dev_info *vlan = vlan_dev_info(dev);
151
152 return nla_total_size(2) + /* IFLA_VLAN_ID */
153 vlan_qos_map_size(vlan->nr_ingress_mappings) +
154 vlan_qos_map_size(vlan->nr_egress_mappings);
155 }
156
157 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
158 {
159 struct vlan_dev_info *vlan = vlan_dev_info(dev);
160 struct vlan_priority_tci_mapping *pm;
161 struct ifla_vlan_flags f;
162 struct ifla_vlan_qos_mapping m;
163 struct nlattr *nest;
164 unsigned int i;
165
166 NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
167 if (vlan->flags) {
168 f.flags = vlan->flags;
169 f.mask = ~0;
170 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
171 }
172 if (vlan->nr_ingress_mappings) {
173 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
174 if (nest == NULL)
175 goto nla_put_failure;
176
177 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
178 if (!vlan->ingress_priority_map[i])
179 continue;
180
181 m.from = i;
182 m.to = vlan->ingress_priority_map[i];
183 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
184 sizeof(m), &m);
185 }
186 nla_nest_end(skb, nest);
187 }
188
189 if (vlan->nr_egress_mappings) {
190 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
191 if (nest == NULL)
192 goto nla_put_failure;
193
194 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
195 for (pm = vlan->egress_priority_map[i]; pm;
196 pm = pm->next) {
197 if (!pm->vlan_qos)
198 continue;
199
200 m.from = pm->priority;
201 m.to = (pm->vlan_qos >> 13) & 0x7;
202 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
203 sizeof(m), &m);
204 }
205 }
206 nla_nest_end(skb, nest);
207 }
208 return 0;
209
210 nla_put_failure:
211 return -EMSGSIZE;
212 }
213
214 struct rtnl_link_ops vlan_link_ops __read_mostly = {
215 .kind = "vlan",
216 .maxtype = IFLA_VLAN_MAX,
217 .policy = vlan_policy,
218 .priv_size = sizeof(struct vlan_dev_info),
219 .setup = vlan_setup,
220 .validate = vlan_validate,
221 .newlink = vlan_newlink,
222 .changelink = vlan_changelink,
223 .dellink = unregister_vlan_dev,
224 .get_size = vlan_get_size,
225 .fill_info = vlan_fill_info,
226 };
227
228 int __init vlan_netlink_init(void)
229 {
230 return rtnl_link_register(&vlan_link_ops);
231 }
232
233 void __exit vlan_netlink_fini(void)
234 {
235 rtnl_link_unregister(&vlan_link_ops);
236 }
237
238 MODULE_ALIAS_RTNL_LINK("vlan");
239
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