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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"
19
20
21static 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 },
26 [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
27};
28
29static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
30 [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
31};
32
33
34static inline int vlan_validate_qos_map(struct nlattr *attr)
35{
36 if (!attr)
37 return 0;
38 return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
39}
40
41static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
42{
43 struct ifla_vlan_flags *flags;
44 u16 id;
45 int err;
46
47 if (tb[IFLA_ADDRESS]) {
48 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
49 return -EINVAL;
50 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
51 return -EADDRNOTAVAIL;
52 }
53
54 if (!data)
55 return -EINVAL;
56
57 if (data[IFLA_VLAN_PROTOCOL]) {
58 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
59 case __constant_htons(ETH_P_8021Q):
60 case __constant_htons(ETH_P_8021AD):
61 break;
62 default:
63 return -EPROTONOSUPPORT;
64 }
65 }
66
67 if (data[IFLA_VLAN_ID]) {
68 id = nla_get_u16(data[IFLA_VLAN_ID]);
69 if (id >= VLAN_VID_MASK)
70 return -ERANGE;
71 }
72 if (data[IFLA_VLAN_FLAGS]) {
73 flags = nla_data(data[IFLA_VLAN_FLAGS]);
74 if ((flags->flags & flags->mask) &
75 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
76 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
77 return -EINVAL;
78 }
79
80 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
81 if (err < 0)
82 return err;
83 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
84 if (err < 0)
85 return err;
86 return 0;
87}
88
89static int vlan_changelink(struct net_device *dev,
90 struct nlattr *tb[], struct nlattr *data[])
91{
92 struct ifla_vlan_flags *flags;
93 struct ifla_vlan_qos_mapping *m;
94 struct nlattr *attr;
95 int rem;
96
97 if (data[IFLA_VLAN_FLAGS]) {
98 flags = nla_data(data[IFLA_VLAN_FLAGS]);
99 vlan_dev_change_flags(dev, flags->flags, flags->mask);
100 }
101 if (data[IFLA_VLAN_INGRESS_QOS]) {
102 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
103 m = nla_data(attr);
104 vlan_dev_set_ingress_priority(dev, m->to, m->from);
105 }
106 }
107 if (data[IFLA_VLAN_EGRESS_QOS]) {
108 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
109 m = nla_data(attr);
110 vlan_dev_set_egress_priority(dev, m->from, m->to);
111 }
112 }
113 return 0;
114}
115
116static int vlan_newlink(struct net *src_net, struct net_device *dev,
117 struct nlattr *tb[], struct nlattr *data[])
118{
119 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
120 struct net_device *real_dev;
121 __be16 proto;
122 int err;
123
124 if (!data[IFLA_VLAN_ID])
125 return -EINVAL;
126
127 if (!tb[IFLA_LINK])
128 return -EINVAL;
129 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
130 if (!real_dev)
131 return -ENODEV;
132
133 if (data[IFLA_VLAN_PROTOCOL])
134 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
135 else
136 proto = htons(ETH_P_8021Q);
137
138 vlan->vlan_proto = proto;
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_proto, 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
159static inline size_t vlan_qos_map_size(unsigned int n)
160{
161 if (n == 0)
162 return 0;
163
164 return nla_total_size(sizeof(struct nlattr)) +
165 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
166}
167
168static size_t vlan_get_size(const struct net_device *dev)
169{
170 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
171
172 return nla_total_size(2) +
173 nla_total_size(2) +
174 sizeof(struct ifla_vlan_flags) +
175 vlan_qos_map_size(vlan->nr_ingress_mappings) +
176 vlan_qos_map_size(vlan->nr_egress_mappings);
177}
178
179static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
180{
181 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
182 struct vlan_priority_tci_mapping *pm;
183 struct ifla_vlan_flags f;
184 struct ifla_vlan_qos_mapping m;
185 struct nlattr *nest;
186 unsigned int i;
187
188 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
189 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
190 goto nla_put_failure;
191 if (vlan->flags) {
192 f.flags = vlan->flags;
193 f.mask = ~0;
194 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
195 goto nla_put_failure;
196 }
197 if (vlan->nr_ingress_mappings) {
198 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
199 if (nest == NULL)
200 goto nla_put_failure;
201
202 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
203 if (!vlan->ingress_priority_map[i])
204 continue;
205
206 m.from = i;
207 m.to = vlan->ingress_priority_map[i];
208 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
209 sizeof(m), &m))
210 goto nla_put_failure;
211 }
212 nla_nest_end(skb, nest);
213 }
214
215 if (vlan->nr_egress_mappings) {
216 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
217 if (nest == NULL)
218 goto nla_put_failure;
219
220 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
221 for (pm = vlan->egress_priority_map[i]; pm;
222 pm = pm->next) {
223 if (!pm->vlan_qos)
224 continue;
225
226 m.from = pm->priority;
227 m.to = (pm->vlan_qos >> 13) & 0x7;
228 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
229 sizeof(m), &m))
230 goto nla_put_failure;
231 }
232 }
233 nla_nest_end(skb, nest);
234 }
235 return 0;
236
237nla_put_failure:
238 return -EMSGSIZE;
239}
240
241struct rtnl_link_ops vlan_link_ops __read_mostly = {
242 .kind = "vlan",
243 .maxtype = IFLA_VLAN_MAX,
244 .policy = vlan_policy,
245 .priv_size = sizeof(struct vlan_dev_priv),
246 .setup = vlan_setup,
247 .validate = vlan_validate,
248 .newlink = vlan_newlink,
249 .changelink = vlan_changelink,
250 .dellink = unregister_vlan_dev,
251 .get_size = vlan_get_size,
252 .fill_info = vlan_fill_info,
253};
254
255int __init vlan_netlink_init(void)
256{
257 return rtnl_link_register(&vlan_link_ops);
258}
259
260void __exit vlan_netlink_fini(void)
261{
262 rtnl_link_unregister(&vlan_link_ops);
263}
264
265MODULE_ALIAS_RTNL_LINK("vlan");
266
