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) & ~VLAN_FLAG_REORDER_HDR)
63 return -EINVAL;
64 }
65
66 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
67 if (err < 0)
68 return err;
69 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
70 if (err < 0)
71 return err;
72 return 0;
73 }
74
75 static int vlan_changelink(struct net_device *dev,
76 struct nlattr *tb[], struct nlattr *data[])
77 {
78 struct vlan_dev_info *vlan = vlan_dev_info(dev);
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->flags = (vlan->flags & ~flags->mask) |
87 (flags->flags & flags->mask);
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
104 static int vlan_newlink(struct net_device *dev,
105 struct nlattr *tb[], struct nlattr *data[])
106 {
107 struct vlan_dev_info *vlan = vlan_dev_info(dev);
108 struct net_device *real_dev;
109 int err;
110
111 if (!data[IFLA_VLAN_ID])
112 return -EINVAL;
113
114 if (!tb[IFLA_LINK])
115 return -EINVAL;
116 real_dev = __dev_get_by_index(&init_net, nla_get_u32(tb[IFLA_LINK]));
117 if (!real_dev)
118 return -ENODEV;
119
120 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
121 vlan->real_dev = real_dev;
122 vlan->flags = VLAN_FLAG_REORDER_HDR;
123
124 err = vlan_check_real_dev(real_dev, vlan->vlan_id);
125 if (err < 0)
126 return err;
127
128 if (!tb[IFLA_MTU])
129 dev->mtu = real_dev->mtu;
130 else if (dev->mtu > real_dev->mtu)
131 return -EINVAL;
132
133 err = vlan_changelink(dev, tb, data);
134 if (err < 0)
135 return err;
136
137 return register_vlan_dev(dev);
138 }
139
140 static inline size_t vlan_qos_map_size(unsigned int n)
141 {
142 if (n == 0)
143 return 0;
144 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
145 return nla_total_size(sizeof(struct nlattr)) +
146 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
147 }
148
149 static size_t vlan_get_size(const struct net_device *dev)
150 {
151 struct vlan_dev_info *vlan = vlan_dev_info(dev);
152
153 return nla_total_size(2) + /* IFLA_VLAN_ID */
154 vlan_qos_map_size(vlan->nr_ingress_mappings) +
155 vlan_qos_map_size(vlan->nr_egress_mappings);
156 }
157
158 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
159 {
160 struct vlan_dev_info *vlan = vlan_dev_info(dev);
161 struct vlan_priority_tci_mapping *pm;
162 struct ifla_vlan_flags f;
163 struct ifla_vlan_qos_mapping m;
164 struct nlattr *nest;
165 unsigned int i;
166
167 NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
168 if (vlan->flags) {
169 f.flags = vlan->flags;
170 f.mask = ~0;
171 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
172 }
173 if (vlan->nr_ingress_mappings) {
174 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
175 if (nest == NULL)
176 goto nla_put_failure;
177
178 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
179 if (!vlan->ingress_priority_map[i])
180 continue;
181
182 m.from = i;
183 m.to = vlan->ingress_priority_map[i];
184 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
185 sizeof(m), &m);
186 }
187 nla_nest_end(skb, nest);
188 }
189
190 if (vlan->nr_egress_mappings) {
191 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
192 if (nest == NULL)
193 goto nla_put_failure;
194
195 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
196 for (pm = vlan->egress_priority_map[i]; pm;
197 pm = pm->next) {
198 if (!pm->vlan_qos)
199 continue;
200
201 m.from = pm->priority;
202 m.to = (pm->vlan_qos >> 13) & 0x7;
203 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
204 sizeof(m), &m);
205 }
206 }
207 nla_nest_end(skb, nest);
208 }
209 return 0;
210
211 nla_put_failure:
212 return -EMSGSIZE;
213 }
214
215 struct rtnl_link_ops vlan_link_ops __read_mostly = {
216 .kind = "vlan",
217 .maxtype = IFLA_VLAN_MAX,
218 .policy = vlan_policy,
219 .priv_size = sizeof(struct vlan_dev_info),
220 .setup = vlan_setup,
221 .validate = vlan_validate,
222 .newlink = vlan_newlink,
223 .changelink = vlan_changelink,
224 .dellink = unregister_vlan_dev,
225 .get_size = vlan_get_size,
226 .fill_info = vlan_fill_info,
227 };
228
229 int __init vlan_netlink_init(void)
230 {
231 return rtnl_link_register(&vlan_link_ops);
232 }
233
234 void __exit vlan_netlink_fini(void)
235 {
236 rtnl_link_unregister(&vlan_link_ops);
237 }
238
239 MODULE_ALIAS_RTNL_LINK("vlan");
240
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