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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
20static 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
27static 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
32static 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
39static 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) & ~VLAN_FLAG_REORDER_HDR)
63 return -EINVAL;
64 }
65
66 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
67 if (err < 0)
68 return err;
69 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
70 if (err < 0)
71 return err;
72 return 0;
73}
74
75static int vlan_changelink(struct net_device *dev,
76 struct nlattr *tb[], struct nlattr *data[])
77{
78 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
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->flags = (vlan->flags & ~flags->mask) |
87 (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
104static int vlan_newlink(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(&init_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
140static void vlan_dellink(struct net_device *dev)
141{
142 unregister_vlan_device(dev);
143}
144
145static inline size_t vlan_qos_map_size(unsigned int n)
146{
147 if (n == 0)
148 return 0;
149
150 return nla_total_size(sizeof(struct nlattr)) +
151 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
152}
153
154static size_t vlan_get_size(const struct net_device *dev)
155{
156 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
157
158 return nla_total_size(2) +
159 vlan_qos_map_size(vlan->nr_ingress_mappings) +
160 vlan_qos_map_size(vlan->nr_egress_mappings);
161}
162
163static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
164{
165 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
166 struct vlan_priority_tci_mapping *pm;
167 struct ifla_vlan_flags f;
168 struct ifla_vlan_qos_mapping m;
169 struct nlattr *nest;
170 unsigned int i;
171
172 NLA_PUT_U16(skb, IFLA_VLAN_ID, VLAN_DEV_INFO(dev)->vlan_id);
173 if (vlan->flags) {
174 f.flags = vlan->flags;
175 f.mask = ~0;
176 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
177 }
178 if (vlan->nr_ingress_mappings) {
179 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
180 if (nest == NULL)
181 goto nla_put_failure;
182
183 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
184 if (!vlan->ingress_priority_map[i])
185 continue;
186
187 m.from = i;
188 m.to = vlan->ingress_priority_map[i];
189 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
190 sizeof(m), &m);
191 }
192 nla_nest_end(skb, nest);
193 }
194
195 if (vlan->nr_egress_mappings) {
196 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
197 if (nest == NULL)
198 goto nla_put_failure;
199
200 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
201 for (pm = vlan->egress_priority_map[i]; pm;
202 pm = pm->next) {
203 if (!pm->vlan_qos)
204 continue;
205
206 m.from = pm->priority;
207 m.to = (pm->vlan_qos >> 13) & 0x7;
208 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
209 sizeof(m), &m);
210 }
211 }
212 nla_nest_end(skb, nest);
213 }
214 return 0;
215
216nla_put_failure:
217 return -EMSGSIZE;
218}
219
220struct rtnl_link_ops vlan_link_ops __read_mostly = {
221 .kind = "vlan",
222 .maxtype = IFLA_VLAN_MAX,
223 .policy = vlan_policy,
224 .priv_size = sizeof(struct vlan_dev_info),
225 .setup = vlan_setup,
226 .validate = vlan_validate,
227 .newlink = vlan_newlink,
228 .changelink = vlan_changelink,
229 .dellink = vlan_dellink,
230 .get_size = vlan_get_size,
231 .fill_info = vlan_fill_info,
232};
233
234int __init vlan_netlink_init(void)
235{
236 return rtnl_link_register(&vlan_link_ops);
237}
238
239void __exit vlan_netlink_fini(void)
240{
241 rtnl_link_unregister(&vlan_link_ops);
242}
243
244MODULE_ALIAS_RTNL_LINK("vlan");
245
