audit: complex interfield comparison helper
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / 8021q / vlan_netlink.c
blob50711368ad6a964726de2b284f84ca7d77468759
1 /*
2 * VLAN netlink control interface
4 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
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 */
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"
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 },
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) },
33 static inline int vlan_validate_qos_map(struct nlattr *attr)
35 if (!attr)
36 return 0;
37 return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
40 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
42 struct ifla_vlan_flags *flags;
43 u16 id;
44 int err;
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;
53 if (!data)
54 return -EINVAL;
56 if (data[IFLA_VLAN_ID]) {
57 id = nla_get_u16(data[IFLA_VLAN_ID]);
58 if (id >= VLAN_VID_MASK)
59 return -ERANGE;
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))
66 return -EINVAL;
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;
78 static int vlan_changelink(struct net_device *dev,
79 struct nlattr *tb[], struct nlattr *data[])
81 struct ifla_vlan_flags *flags;
82 struct ifla_vlan_qos_mapping *m;
83 struct nlattr *attr;
84 int rem;
86 if (data[IFLA_VLAN_FLAGS]) {
87 flags = nla_data(data[IFLA_VLAN_FLAGS]);
88 vlan_dev_change_flags(dev, flags->flags, flags->mask);
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);
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);
102 return 0;
105 static int vlan_newlink(struct net *src_net, struct net_device *dev,
106 struct nlattr *tb[], struct nlattr *data[])
108 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
109 struct net_device *real_dev;
110 int err;
112 if (!data[IFLA_VLAN_ID])
113 return -EINVAL;
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;
121 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
122 vlan->real_dev = real_dev;
123 vlan->flags = VLAN_FLAG_REORDER_HDR;
125 err = vlan_check_real_dev(real_dev, vlan->vlan_id);
126 if (err < 0)
127 return err;
129 if (!tb[IFLA_MTU])
130 dev->mtu = real_dev->mtu;
131 else if (dev->mtu > real_dev->mtu)
132 return -EINVAL;
134 err = vlan_changelink(dev, tb, data);
135 if (err < 0)
136 return err;
138 return register_vlan_dev(dev);
141 static inline size_t vlan_qos_map_size(unsigned int n)
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;
150 static size_t vlan_get_size(const struct net_device *dev)
152 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
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);
160 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
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;
169 NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_priv(dev)->vlan_id);
170 if (vlan->flags) {
171 f.flags = vlan->flags;
172 f.mask = ~0;
173 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
175 if (vlan->nr_ingress_mappings) {
176 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
177 if (nest == NULL)
178 goto nla_put_failure;
180 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
181 if (!vlan->ingress_priority_map[i])
182 continue;
184 m.from = i;
185 m.to = vlan->ingress_priority_map[i];
186 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
187 sizeof(m), &m);
189 nla_nest_end(skb, nest);
192 if (vlan->nr_egress_mappings) {
193 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
194 if (nest == NULL)
195 goto nla_put_failure;
197 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
198 for (pm = vlan->egress_priority_map[i]; pm;
199 pm = pm->next) {
200 if (!pm->vlan_qos)
201 continue;
203 m.from = pm->priority;
204 m.to = (pm->vlan_qos >> 13) & 0x7;
205 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
206 sizeof(m), &m);
209 nla_nest_end(skb, nest);
211 return 0;
213 nla_put_failure:
214 return -EMSGSIZE;
217 struct rtnl_link_ops vlan_link_ops __read_mostly = {
218 .kind = "vlan",
219 .maxtype = IFLA_VLAN_MAX,
220 .policy = vlan_policy,
221 .priv_size = sizeof(struct vlan_dev_priv),
222 .setup = vlan_setup,
223 .validate = vlan_validate,
224 .newlink = vlan_newlink,
225 .changelink = vlan_changelink,
226 .dellink = unregister_vlan_dev,
227 .get_size = vlan_get_size,
228 .fill_info = vlan_fill_info,
231 int __init vlan_netlink_init(void)
233 return rtnl_link_register(&vlan_link_ops);
236 void __exit vlan_netlink_fini(void)
238 rtnl_link_unregister(&vlan_link_ops);
241 MODULE_ALIAS_RTNL_LINK("vlan");