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