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8#include <linux/kernel.h>
9#include <linux/netdevice.h>
10#include <linux/if_vlan.h>
11#include <linux/module.h>
12#include <net/net_namespace.h>
13#include <net/netlink.h>
14#include <net/rtnetlink.h>
15#include "vlan.h"
16
17
18static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
19 [IFLA_VLAN_ID] = { .type = NLA_U16 },
20 [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
21 [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
22 [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
23 [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
24};
25
26static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
27 [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
28};
29
30
31static inline int vlan_validate_qos_map(struct nlattr *attr)
32{
33 if (!attr)
34 return 0;
35 return nla_validate_nested_deprecated(attr, IFLA_VLAN_QOS_MAX,
36 vlan_map_policy, NULL);
37}
38
39static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
40 struct netlink_ext_ack *extack)
41{
42 struct ifla_vlan_flags *flags;
43 u16 id;
44 int err;
45
46 if (tb[IFLA_ADDRESS]) {
47 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
48 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
49 return -EINVAL;
50 }
51 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
52 NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
53 return -EADDRNOTAVAIL;
54 }
55 }
56
57 if (!data) {
58 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
59 return -EINVAL;
60 }
61
62 if (data[IFLA_VLAN_PROTOCOL]) {
63 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
64 case htons(ETH_P_8021Q):
65 case htons(ETH_P_8021AD):
66 break;
67 default:
68 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
69 return -EPROTONOSUPPORT;
70 }
71 }
72
73 if (data[IFLA_VLAN_ID]) {
74 id = nla_get_u16(data[IFLA_VLAN_ID]);
75 if (id >= VLAN_VID_MASK) {
76 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id");
77 return -ERANGE;
78 }
79 }
80 if (data[IFLA_VLAN_FLAGS]) {
81 flags = nla_data(data[IFLA_VLAN_FLAGS]);
82 if ((flags->flags & flags->mask) &
83 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
84 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
85 VLAN_FLAG_BRIDGE_BINDING)) {
86 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
87 return -EINVAL;
88 }
89 }
90
91 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
92 if (err < 0) {
93 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
94 return err;
95 }
96 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
97 if (err < 0) {
98 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
99 return err;
100 }
101 return 0;
102}
103
104static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
105 struct nlattr *data[],
106 struct netlink_ext_ack *extack)
107{
108 struct ifla_vlan_flags *flags;
109 struct ifla_vlan_qos_mapping *m;
110 struct nlattr *attr;
111 int rem;
112
113 if (data[IFLA_VLAN_FLAGS]) {
114 flags = nla_data(data[IFLA_VLAN_FLAGS]);
115 vlan_dev_change_flags(dev, flags->flags, flags->mask);
116 }
117 if (data[IFLA_VLAN_INGRESS_QOS]) {
118 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
119 m = nla_data(attr);
120 vlan_dev_set_ingress_priority(dev, m->to, m->from);
121 }
122 }
123 if (data[IFLA_VLAN_EGRESS_QOS]) {
124 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
125 m = nla_data(attr);
126 vlan_dev_set_egress_priority(dev, m->from, m->to);
127 }
128 }
129 return 0;
130}
131
132static int vlan_newlink(struct net *src_net, struct net_device *dev,
133 struct nlattr *tb[], struct nlattr *data[],
134 struct netlink_ext_ack *extack)
135{
136 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
137 struct net_device *real_dev;
138 unsigned int max_mtu;
139 __be16 proto;
140 int err;
141
142 if (!data[IFLA_VLAN_ID]) {
143 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
144 return -EINVAL;
145 }
146
147 if (!tb[IFLA_LINK]) {
148 NL_SET_ERR_MSG_MOD(extack, "link not specified");
149 return -EINVAL;
150 }
151
152 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
153 if (!real_dev) {
154 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
155 return -ENODEV;
156 }
157
158 if (data[IFLA_VLAN_PROTOCOL])
159 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
160 else
161 proto = htons(ETH_P_8021Q);
162
163 vlan->vlan_proto = proto;
164 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
165 vlan->real_dev = real_dev;
166 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
167 vlan->flags = VLAN_FLAG_REORDER_HDR;
168
169 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
170 extack);
171 if (err < 0)
172 return err;
173
174 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
175 real_dev->mtu;
176 if (!tb[IFLA_MTU])
177 dev->mtu = max_mtu;
178 else if (dev->mtu > max_mtu)
179 return -EINVAL;
180
181 err = vlan_changelink(dev, tb, data, extack);
182 if (err < 0)
183 return err;
184
185 return register_vlan_dev(dev, extack);
186}
187
188static inline size_t vlan_qos_map_size(unsigned int n)
189{
190 if (n == 0)
191 return 0;
192
193 return nla_total_size(sizeof(struct nlattr)) +
194 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
195}
196
197static size_t vlan_get_size(const struct net_device *dev)
198{
199 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
200
201 return nla_total_size(2) +
202 nla_total_size(2) +
203 nla_total_size(sizeof(struct ifla_vlan_flags)) +
204 vlan_qos_map_size(vlan->nr_ingress_mappings) +
205 vlan_qos_map_size(vlan->nr_egress_mappings);
206}
207
208static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
209{
210 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
211 struct vlan_priority_tci_mapping *pm;
212 struct ifla_vlan_flags f;
213 struct ifla_vlan_qos_mapping m;
214 struct nlattr *nest;
215 unsigned int i;
216
217 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
218 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
219 goto nla_put_failure;
220 if (vlan->flags) {
221 f.flags = vlan->flags;
222 f.mask = ~0;
223 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
224 goto nla_put_failure;
225 }
226 if (vlan->nr_ingress_mappings) {
227 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
228 if (nest == NULL)
229 goto nla_put_failure;
230
231 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
232 if (!vlan->ingress_priority_map[i])
233 continue;
234
235 m.from = i;
236 m.to = vlan->ingress_priority_map[i];
237 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
238 sizeof(m), &m))
239 goto nla_put_failure;
240 }
241 nla_nest_end(skb, nest);
242 }
243
244 if (vlan->nr_egress_mappings) {
245 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
246 if (nest == NULL)
247 goto nla_put_failure;
248
249 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
250 for (pm = vlan->egress_priority_map[i]; pm;
251 pm = pm->next) {
252 if (!pm->vlan_qos)
253 continue;
254
255 m.from = pm->priority;
256 m.to = (pm->vlan_qos >> 13) & 0x7;
257 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
258 sizeof(m), &m))
259 goto nla_put_failure;
260 }
261 }
262 nla_nest_end(skb, nest);
263 }
264 return 0;
265
266nla_put_failure:
267 return -EMSGSIZE;
268}
269
270static struct net *vlan_get_link_net(const struct net_device *dev)
271{
272 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
273
274 return dev_net(real_dev);
275}
276
277struct rtnl_link_ops vlan_link_ops __read_mostly = {
278 .kind = "vlan",
279 .maxtype = IFLA_VLAN_MAX,
280 .policy = vlan_policy,
281 .priv_size = sizeof(struct vlan_dev_priv),
282 .setup = vlan_setup,
283 .validate = vlan_validate,
284 .newlink = vlan_newlink,
285 .changelink = vlan_changelink,
286 .dellink = unregister_vlan_dev,
287 .get_size = vlan_get_size,
288 .fill_info = vlan_fill_info,
289 .get_link_net = vlan_get_link_net,
290};
291
292int __init vlan_netlink_init(void)
293{
294 return rtnl_link_register(&vlan_link_ops);
295}
296
297void __exit vlan_netlink_fini(void)
298{
299 rtnl_link_unregister(&vlan_link_ops);
300}
301
302MODULE_ALIAS_RTNL_LINK("vlan");
303
