net: vlan: rename NETIF_F_HW_VLAN_* feature flags to NETIF_F_HW_VLAN_CTAG_*
[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 };
27
28 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
29         [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
30 };
31
32
33 static inline int vlan_validate_qos_map(struct nlattr *attr)
34 {
35         if (!attr)
36                 return 0;
37         return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
38 }
39
40 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
41 {
42         struct ifla_vlan_flags *flags;
43         u16 id;
44         int err;
45
46         if (tb[IFLA_ADDRESS]) {
47                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
48                         return -EINVAL;
49                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
50                         return -EADDRNOTAVAIL;
51         }
52
53         if (!data)
54                 return -EINVAL;
55
56         if (data[IFLA_VLAN_ID]) {
57                 id = nla_get_u16(data[IFLA_VLAN_ID]);
58                 if (id >= VLAN_VID_MASK)
59                         return -ERANGE;
60         }
61         if (data[IFLA_VLAN_FLAGS]) {
62                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
63                 if ((flags->flags & flags->mask) &
64                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
65                       VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
66                         return -EINVAL;
67         }
68
69         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
70         if (err < 0)
71                 return err;
72         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
73         if (err < 0)
74                 return err;
75         return 0;
76 }
77
78 static int vlan_changelink(struct net_device *dev,
79                            struct nlattr *tb[], struct nlattr *data[])
80 {
81         struct ifla_vlan_flags *flags;
82         struct ifla_vlan_qos_mapping *m;
83         struct nlattr *attr;
84         int rem;
85
86         if (data[IFLA_VLAN_FLAGS]) {
87                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
88                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
89         }
90         if (data[IFLA_VLAN_INGRESS_QOS]) {
91                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
92                         m = nla_data(attr);
93                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
94                 }
95         }
96         if (data[IFLA_VLAN_EGRESS_QOS]) {
97                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
98                         m = nla_data(attr);
99                         vlan_dev_set_egress_priority(dev, m->from, m->to);
100                 }
101         }
102         return 0;
103 }
104
105 static int vlan_newlink(struct net *src_net, struct net_device *dev,
106                         struct nlattr *tb[], struct nlattr *data[])
107 {
108         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
109         struct net_device *real_dev;
110         int err;
111
112         if (!data[IFLA_VLAN_ID])
113                 return -EINVAL;
114
115         if (!tb[IFLA_LINK])
116                 return -EINVAL;
117         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
118         if (!real_dev)
119                 return -ENODEV;
120
121         vlan->vlan_id  = nla_get_u16(data[IFLA_VLAN_ID]);
122         vlan->real_dev = real_dev;
123         vlan->flags    = VLAN_FLAG_REORDER_HDR;
124
125         err = vlan_check_real_dev(real_dev, vlan->vlan_id);
126         if (err < 0)
127                 return err;
128
129         if (!tb[IFLA_MTU])
130                 dev->mtu = real_dev->mtu;
131         else if (dev->mtu > real_dev->mtu)
132                 return -EINVAL;
133
134         err = vlan_changelink(dev, tb, data);
135         if (err < 0)
136                 return err;
137
138         return register_vlan_dev(dev);
139 }
140
141 static inline size_t vlan_qos_map_size(unsigned int n)
142 {
143         if (n == 0)
144                 return 0;
145         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
146         return nla_total_size(sizeof(struct nlattr)) +
147                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
148 }
149
150 static size_t vlan_get_size(const struct net_device *dev)
151 {
152         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
153
154         return nla_total_size(2) +      /* IFLA_VLAN_ID */
155                sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
156                vlan_qos_map_size(vlan->nr_ingress_mappings) +
157                vlan_qos_map_size(vlan->nr_egress_mappings);
158 }
159
160 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
161 {
162         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
163         struct vlan_priority_tci_mapping *pm;
164         struct ifla_vlan_flags f;
165         struct ifla_vlan_qos_mapping m;
166         struct nlattr *nest;
167         unsigned int i;
168
169         if (nla_put_u16(skb, IFLA_VLAN_ID, vlan_dev_priv(dev)->vlan_id))
170                 goto nla_put_failure;
171         if (vlan->flags) {
172                 f.flags = vlan->flags;
173                 f.mask  = ~0;
174                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
175                         goto nla_put_failure;
176         }
177         if (vlan->nr_ingress_mappings) {
178                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
179                 if (nest == NULL)
180                         goto nla_put_failure;
181
182                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
183                         if (!vlan->ingress_priority_map[i])
184                                 continue;
185
186                         m.from = i;
187                         m.to   = vlan->ingress_priority_map[i];
188                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
189                                     sizeof(m), &m))
190                                 goto nla_put_failure;
191                 }
192                 nla_nest_end(skb, nest);
193         }
194
195         if (vlan->nr_egress_mappings) {
196                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
197                 if (nest == NULL)
198                         goto nla_put_failure;
199
200                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
201                         for (pm = vlan->egress_priority_map[i]; pm;
202                              pm = pm->next) {
203                                 if (!pm->vlan_qos)
204                                         continue;
205
206                                 m.from = pm->priority;
207                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
208                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
209                                             sizeof(m), &m))
210                                         goto nla_put_failure;
211                         }
212                 }
213                 nla_nest_end(skb, nest);
214         }
215         return 0;
216
217 nla_put_failure:
218         return -EMSGSIZE;
219 }
220
221 struct rtnl_link_ops vlan_link_ops __read_mostly = {
222         .kind           = "vlan",
223         .maxtype        = IFLA_VLAN_MAX,
224         .policy         = vlan_policy,
225         .priv_size      = sizeof(struct vlan_dev_priv),
226         .setup          = vlan_setup,
227         .validate       = vlan_validate,
228         .newlink        = vlan_newlink,
229         .changelink     = vlan_changelink,
230         .dellink        = unregister_vlan_dev,
231         .get_size       = vlan_get_size,
232         .fill_info      = vlan_fill_info,
233 };
234
235 int __init vlan_netlink_init(void)
236 {
237         return rtnl_link_register(&vlan_link_ops);
238 }
239
240 void __exit vlan_netlink_fini(void)
241 {
242         rtnl_link_unregister(&vlan_link_ops);
243 }
244
245 MODULE_ALIAS_RTNL_LINK("vlan");