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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) &
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
77static 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
104static 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
123static 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
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_info *vlan = vlan_dev_info(dev);
171
172 return nla_total_size(2) +
173 sizeof(struct ifla_vlan_flags) +
174 vlan_qos_map_size(vlan->nr_ingress_mappings) +
175 vlan_qos_map_size(vlan->nr_egress_mappings);
176}
177
178static 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
231nla_put_failure:
232 return -EMSGSIZE;
233}
234
235struct 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
250int __init vlan_netlink_init(void)
251{
252 return rtnl_link_register(&vlan_link_ops);
253}
254
255void __exit vlan_netlink_fini(void)
256{
257 rtnl_link_unregister(&vlan_link_ops);
258}
259
260MODULE_ALIAS_RTNL_LINK("vlan");
261
