[media] v4l2-subdev.h: remove unused s_mode tuner op
[linux-2.6.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 <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                       VLAN_FLAG_LOOSE_BINDING))
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 {
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]);
87                 vlan_dev_change_flags(dev, 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 *src_net, 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(src_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                sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
155                vlan_qos_map_size(vlan->nr_ingress_mappings) +
156                vlan_qos_map_size(vlan->nr_egress_mappings);
157 }
158
159 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
160 {
161         struct vlan_dev_info *vlan = vlan_dev_info(dev);
162         struct vlan_priority_tci_mapping *pm;
163         struct ifla_vlan_flags f;
164         struct ifla_vlan_qos_mapping m;
165         struct nlattr *nest;
166         unsigned int i;
167
168         NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
169         if (vlan->flags) {
170                 f.flags = vlan->flags;
171                 f.mask  = ~0;
172                 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
173         }
174         if (vlan->nr_ingress_mappings) {
175                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
176                 if (nest == NULL)
177                         goto nla_put_failure;
178
179                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
180                         if (!vlan->ingress_priority_map[i])
181                                 continue;
182
183                         m.from = i;
184                         m.to   = vlan->ingress_priority_map[i];
185                         NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
186                                 sizeof(m), &m);
187                 }
188                 nla_nest_end(skb, nest);
189         }
190
191         if (vlan->nr_egress_mappings) {
192                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
193                 if (nest == NULL)
194                         goto nla_put_failure;
195
196                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
197                         for (pm = vlan->egress_priority_map[i]; pm;
198                              pm = pm->next) {
199                                 if (!pm->vlan_qos)
200                                         continue;
201
202                                 m.from = pm->priority;
203                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
204                                 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
205                                         sizeof(m), &m);
206                         }
207                 }
208                 nla_nest_end(skb, nest);
209         }
210         return 0;
211
212 nla_put_failure:
213         return -EMSGSIZE;
214 }
215
216 struct rtnl_link_ops vlan_link_ops __read_mostly = {
217         .kind           = "vlan",
218         .maxtype        = IFLA_VLAN_MAX,
219         .policy         = vlan_policy,
220         .priv_size      = sizeof(struct vlan_dev_info),
221         .setup          = vlan_setup,
222         .validate       = vlan_validate,
223         .newlink        = vlan_newlink,
224         .changelink     = vlan_changelink,
225         .dellink        = unregister_vlan_dev,
226         .get_size       = vlan_get_size,
227         .fill_info      = vlan_fill_info,
228 };
229
230 int __init vlan_netlink_init(void)
231 {
232         return rtnl_link_register(&vlan_link_ops);
233 }
234
235 void __exit vlan_netlink_fini(void)
236 {
237         rtnl_link_unregister(&vlan_link_ops);
238 }
239
240 MODULE_ALIAS_RTNL_LINK("vlan");