vlan: Add support for net_devices_ops.ndo_fcoe_enable/_disable to VLAN
[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                         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");