ipv6: fix leaking uninitialized port number of offender sockaddr
[linux-3.10.git] / net / 8021q / vlan_netlink.c
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 <linux/module.h>
15 #include <net/net_namespace.h>
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 },
26         [IFLA_VLAN_PROTOCOL]    = { .type = NLA_U16 },
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;
38         return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
39 }
40
41 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
42 {
43         struct ifla_vlan_flags *flags;
44         u16 id;
45         int err;
46
47         if (tb[IFLA_ADDRESS]) {
48                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
49                         return -EINVAL;
50                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
51                         return -EADDRNOTAVAIL;
52         }
53
54         if (!data)
55                 return -EINVAL;
56
57         if (data[IFLA_VLAN_PROTOCOL]) {
58                 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
59                 case __constant_htons(ETH_P_8021Q):
60                 case __constant_htons(ETH_P_8021AD):
61                         break;
62                 default:
63                         return -EPROTONOSUPPORT;
64                 }
65         }
66
67         if (data[IFLA_VLAN_ID]) {
68                 id = nla_get_u16(data[IFLA_VLAN_ID]);
69                 if (id >= VLAN_VID_MASK)
70                         return -ERANGE;
71         }
72         if (data[IFLA_VLAN_FLAGS]) {
73                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
74                 if ((flags->flags & flags->mask) &
75                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
76                       VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
77                         return -EINVAL;
78         }
79
80         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
81         if (err < 0)
82                 return err;
83         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
84         if (err < 0)
85                 return err;
86         return 0;
87 }
88
89 static int vlan_changelink(struct net_device *dev,
90                            struct nlattr *tb[], struct nlattr *data[])
91 {
92         struct ifla_vlan_flags *flags;
93         struct ifla_vlan_qos_mapping *m;
94         struct nlattr *attr;
95         int rem;
96
97         if (data[IFLA_VLAN_FLAGS]) {
98                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
99                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
100         }
101         if (data[IFLA_VLAN_INGRESS_QOS]) {
102                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
103                         m = nla_data(attr);
104                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
105                 }
106         }
107         if (data[IFLA_VLAN_EGRESS_QOS]) {
108                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
109                         m = nla_data(attr);
110                         vlan_dev_set_egress_priority(dev, m->from, m->to);
111                 }
112         }
113         return 0;
114 }
115
116 static int vlan_newlink(struct net *src_net, struct net_device *dev,
117                         struct nlattr *tb[], struct nlattr *data[])
118 {
119         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
120         struct net_device *real_dev;
121         __be16 proto;
122         int err;
123
124         if (!data[IFLA_VLAN_ID])
125                 return -EINVAL;
126
127         if (!tb[IFLA_LINK])
128                 return -EINVAL;
129         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
130         if (!real_dev)
131                 return -ENODEV;
132
133         if (data[IFLA_VLAN_PROTOCOL])
134                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
135         else
136                 proto = htons(ETH_P_8021Q);
137
138         vlan->vlan_proto = proto;
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_proto, 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
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 {
170         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
171
172         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
173                nla_total_size(2) +      /* IFLA_VLAN_ID */
174                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
175                vlan_qos_map_size(vlan->nr_ingress_mappings) +
176                vlan_qos_map_size(vlan->nr_egress_mappings);
177 }
178
179 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
180 {
181         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
182         struct vlan_priority_tci_mapping *pm;
183         struct ifla_vlan_flags f;
184         struct ifla_vlan_qos_mapping m;
185         struct nlattr *nest;
186         unsigned int i;
187
188         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
189             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
190                 goto nla_put_failure;
191         if (vlan->flags) {
192                 f.flags = vlan->flags;
193                 f.mask  = ~0;
194                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
195                         goto nla_put_failure;
196         }
197         if (vlan->nr_ingress_mappings) {
198                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
199                 if (nest == NULL)
200                         goto nla_put_failure;
201
202                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
203                         if (!vlan->ingress_priority_map[i])
204                                 continue;
205
206                         m.from = i;
207                         m.to   = vlan->ingress_priority_map[i];
208                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
209                                     sizeof(m), &m))
210                                 goto nla_put_failure;
211                 }
212                 nla_nest_end(skb, nest);
213         }
214
215         if (vlan->nr_egress_mappings) {
216                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
217                 if (nest == NULL)
218                         goto nla_put_failure;
219
220                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
221                         for (pm = vlan->egress_priority_map[i]; pm;
222                              pm = pm->next) {
223                                 if (!pm->vlan_qos)
224                                         continue;
225
226                                 m.from = pm->priority;
227                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
228                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
229                                             sizeof(m), &m))
230                                         goto nla_put_failure;
231                         }
232                 }
233                 nla_nest_end(skb, nest);
234         }
235         return 0;
236
237 nla_put_failure:
238         return -EMSGSIZE;
239 }
240
241 struct rtnl_link_ops vlan_link_ops __read_mostly = {
242         .kind           = "vlan",
243         .maxtype        = IFLA_VLAN_MAX,
244         .policy         = vlan_policy,
245         .priv_size      = sizeof(struct vlan_dev_priv),
246         .setup          = vlan_setup,
247         .validate       = vlan_validate,
248         .newlink        = vlan_newlink,
249         .changelink     = vlan_changelink,
250         .dellink        = unregister_vlan_dev,
251         .get_size       = vlan_get_size,
252         .fill_info      = vlan_fill_info,
253 };
254
255 int __init vlan_netlink_init(void)
256 {
257         return rtnl_link_register(&vlan_link_ops);
258 }
259
260 void __exit vlan_netlink_fini(void)
261 {
262         rtnl_link_unregister(&vlan_link_ops);
263 }
264
265 MODULE_ALIAS_RTNL_LINK("vlan");