vlan: Precise RX stats accounting
[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_get_tx_queues(struct net *net,
104                               struct nlattr *tb[],
105                               unsigned int *num_tx_queues,
106                               unsigned int *real_num_tx_queues)
107 {
108         struct net_device *real_dev;
109
110         if (!tb[IFLA_LINK])
111                 return -EINVAL;
112
113         real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
114         if (!real_dev)
115                 return -ENODEV;
116
117         *num_tx_queues      = real_dev->num_tx_queues;
118         *real_num_tx_queues = real_dev->real_num_tx_queues;
119         return 0;
120 }
121
122 static int vlan_newlink(struct net *src_net, struct net_device *dev,
123                         struct nlattr *tb[], struct nlattr *data[])
124 {
125         struct vlan_dev_info *vlan = vlan_dev_info(dev);
126         struct net_device *real_dev;
127         int err;
128
129         if (!data[IFLA_VLAN_ID])
130                 return -EINVAL;
131
132         if (!tb[IFLA_LINK])
133                 return -EINVAL;
134         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
135         if (!real_dev)
136                 return -ENODEV;
137
138         vlan->vlan_id  = nla_get_u16(data[IFLA_VLAN_ID]);
139         vlan->real_dev = real_dev;
140         vlan->flags    = VLAN_FLAG_REORDER_HDR;
141
142         err = vlan_check_real_dev(real_dev, vlan->vlan_id);
143         if (err < 0)
144                 return err;
145
146         if (!tb[IFLA_MTU])
147                 dev->mtu = real_dev->mtu;
148         else if (dev->mtu > real_dev->mtu)
149                 return -EINVAL;
150
151         err = vlan_changelink(dev, tb, data);
152         if (err < 0)
153                 return err;
154
155         return register_vlan_dev(dev);
156 }
157
158 static inline size_t vlan_qos_map_size(unsigned int n)
159 {
160         if (n == 0)
161                 return 0;
162         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
163         return nla_total_size(sizeof(struct nlattr)) +
164                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
165 }
166
167 static size_t vlan_get_size(const struct net_device *dev)
168 {
169         struct vlan_dev_info *vlan = vlan_dev_info(dev);
170
171         return nla_total_size(2) +      /* IFLA_VLAN_ID */
172                sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
173                vlan_qos_map_size(vlan->nr_ingress_mappings) +
174                vlan_qos_map_size(vlan->nr_egress_mappings);
175 }
176
177 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
178 {
179         struct vlan_dev_info *vlan = vlan_dev_info(dev);
180         struct vlan_priority_tci_mapping *pm;
181         struct ifla_vlan_flags f;
182         struct ifla_vlan_qos_mapping m;
183         struct nlattr *nest;
184         unsigned int i;
185
186         NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
187         if (vlan->flags) {
188                 f.flags = vlan->flags;
189                 f.mask  = ~0;
190                 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
191         }
192         if (vlan->nr_ingress_mappings) {
193                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
194                 if (nest == NULL)
195                         goto nla_put_failure;
196
197                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
198                         if (!vlan->ingress_priority_map[i])
199                                 continue;
200
201                         m.from = i;
202                         m.to   = vlan->ingress_priority_map[i];
203                         NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
204                                 sizeof(m), &m);
205                 }
206                 nla_nest_end(skb, nest);
207         }
208
209         if (vlan->nr_egress_mappings) {
210                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
211                 if (nest == NULL)
212                         goto nla_put_failure;
213
214                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
215                         for (pm = vlan->egress_priority_map[i]; pm;
216                              pm = pm->next) {
217                                 if (!pm->vlan_qos)
218                                         continue;
219
220                                 m.from = pm->priority;
221                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
222                                 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
223                                         sizeof(m), &m);
224                         }
225                 }
226                 nla_nest_end(skb, nest);
227         }
228         return 0;
229
230 nla_put_failure:
231         return -EMSGSIZE;
232 }
233
234 struct rtnl_link_ops vlan_link_ops __read_mostly = {
235         .kind           = "vlan",
236         .maxtype        = IFLA_VLAN_MAX,
237         .policy         = vlan_policy,
238         .priv_size      = sizeof(struct vlan_dev_info),
239         .get_tx_queues  = vlan_get_tx_queues,
240         .setup          = vlan_setup,
241         .validate       = vlan_validate,
242         .newlink        = vlan_newlink,
243         .changelink     = vlan_changelink,
244         .dellink        = unregister_vlan_dev,
245         .get_size       = vlan_get_size,
246         .fill_info      = vlan_fill_info,
247 };
248
249 int __init vlan_netlink_init(void)
250 {
251         return rtnl_link_register(&vlan_link_ops);
252 }
253
254 void __exit vlan_netlink_fini(void)
255 {
256         rtnl_link_unregister(&vlan_link_ops);
257 }
258
259 MODULE_ALIAS_RTNL_LINK("vlan");