aboutsummaryrefslogtreecommitdiff
path: root/net/8021q/vlan_netlink.c
blob: 0db85aeb119b88fae1abaf7d0a10019ba4044915 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
// SPDX-License-Identifier: GPL-2.0-only
/*
 *	VLAN netlink control interface
 *
 * 	Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/module.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
#include <net/rtnetlink.h>
#include "vlan.h"


static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
	[IFLA_VLAN_ID]		= { .type = NLA_U16 },
	[IFLA_VLAN_FLAGS]	= { .len = sizeof(struct ifla_vlan_flags) },
	[IFLA_VLAN_EGRESS_QOS]	= { .type = NLA_NESTED },
	[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
	[IFLA_VLAN_PROTOCOL]	= { .type = NLA_U16 },
};

static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
	[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
};


static inline int vlan_validate_qos_map(struct nlattr *attr)
{
	if (!attr)
		return 0;
	return nla_validate_nested_deprecated(attr, IFLA_VLAN_QOS_MAX,
					      vlan_map_policy, NULL);
}

static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
			 struct netlink_ext_ack *extack)
{
	struct ifla_vlan_flags *flags;
	u16 id;
	int err;

	if (tb[IFLA_ADDRESS]) {
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
			NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
			return -EINVAL;
		}
		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
			NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
			return -EADDRNOTAVAIL;
		}
	}

	if (!data) {
		NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
		return -EINVAL;
	}

	if (data[IFLA_VLAN_PROTOCOL]) {
		switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
		case htons(ETH_P_8021Q):
		case htons(ETH_P_8021AD):
			break;
		default:
			NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
			return -EPROTONOSUPPORT;
		}
	}

	if (data[IFLA_VLAN_ID]) {
		id = nla_get_u16(data[IFLA_VLAN_ID]);
		if (id >= VLAN_VID_MASK) {
			NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id");
			return -ERANGE;
		}
	}
	if (data[IFLA_VLAN_FLAGS]) {
		flags = nla_data(data[IFLA_VLAN_FLAGS]);
		if ((flags->flags & flags->mask) &
		    ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
		      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
		      VLAN_FLAG_BRIDGE_BINDING)) {
			NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
			return -EINVAL;
		}
	}

	err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
	if (err < 0) {
		NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
		return err;
	}
	err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
	if (err < 0) {
		NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
		return err;
	}
	return 0;
}

static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
			   struct nlattr *data[],
			   struct netlink_ext_ack *extack)
{
	struct ifla_vlan_flags *flags;
	struct ifla_vlan_qos_mapping *m;
	struct nlattr *attr;
	int rem, err;

	if (data[IFLA_VLAN_FLAGS]) {
		flags = nla_data(data[IFLA_VLAN_FLAGS]);
		err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
		if (err)
			return err;
	}
	if (data[IFLA_VLAN_INGRESS_QOS]) {
		nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
			m = nla_data(attr);
			vlan_dev_set_ingress_priority(dev, m->to, m->from);
		}
	}
	if (data[IFLA_VLAN_EGRESS_QOS]) {
		nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
			m = nla_data(attr);
			err = vlan_dev_set_egress_priority(dev, m->from, m->to);
			if (err)
				return err;
		}
	}
	return 0;
}

static int vlan_newlink(struct net *src_net, struct net_device *dev,
			struct nlattr *tb[], struct nlattr *data[],
			struct netlink_ext_ack *extack)
{
	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
	struct net_device *real_dev;
	unsigned int max_mtu;
	__be16 proto;
	int err;

	if (!data[IFLA_VLAN_ID]) {
		NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
		return -EINVAL;
	}

	if (!tb[IFLA_LINK]) {
		NL_SET_ERR_MSG_MOD(extack, "link not specified");
		return -EINVAL;
	}

	real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
	if (!real_dev) {
		NL_SET_ERR_MSG_MOD(extack, "link does not exist");
		return -ENODEV;
	}

	if (data[IFLA_VLAN_PROTOCOL])
		proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
	else
		proto = htons(ETH_P_8021Q);

	vlan->vlan_proto = proto;
	vlan->vlan_id	 = nla_get_u16(data[IFLA_VLAN_ID]);
	vlan->real_dev	 = real_dev;
	dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
	vlan->flags	 = VLAN_FLAG_REORDER_HDR;

	err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
				  extack);
	if (err < 0)
		return err;

	max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
						     real_dev->mtu;
	if (!tb[IFLA_MTU])
		dev->mtu = max_mtu;
	else if (dev->mtu > max_mtu)
		return -EINVAL;

	err = vlan_changelink(dev, tb, data, extack);
	if (!err)
		err = register_vlan_dev(dev, extack);
	if (err)
		vlan_dev_uninit(dev);
	return err;
}

static inline size_t vlan_qos_map_size(unsigned int n)
{
	if (n == 0)
		return 0;
	/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
	return nla_total_size(sizeof(struct nlattr)) +
	       nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
}

static size_t vlan_get_size(const struct net_device *dev)
{
	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);

	return nla_total_size(2) +	/* IFLA_VLAN_PROTOCOL */
	       nla_total_size(2) +	/* IFLA_VLAN_ID */
	       nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
	       vlan_qos_map_size(vlan->nr_ingress_mappings) +
	       vlan_qos_map_size(vlan->nr_egress_mappings);
}

static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
	struct vlan_priority_tci_mapping *pm;
	struct ifla_vlan_flags f;
	struct ifla_vlan_qos_mapping m;
	struct nlattr *nest;
	unsigned int i;

	if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
	    nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
		goto nla_put_failure;
	if (vlan->flags) {
		f.flags = vlan->flags;
		f.mask  = ~0;
		if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
			goto nla_put_failure;
	}
	if (vlan->nr_ingress_mappings) {
		nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
		if (nest == NULL)
			goto nla_put_failure;

		for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
			if (!vlan->ingress_priority_map[i])
				continue;

			m.from = i;
			m.to   = vlan->ingress_priority_map[i];
			if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
				    sizeof(m), &m))
				goto nla_put_failure;
		}
		nla_nest_end(skb, nest);
	}

	if (vlan->nr_egress_mappings) {
		nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
		if (nest == NULL)
			goto nla_put_failure;

		for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
			for (pm = vlan->egress_priority_map[i]; pm;
			     pm = pm->next) {
				if (!pm->vlan_qos)
					continue;

				m.from = pm->priority;
				m.to   = (pm->vlan_qos >> 13) & 0x7;
				if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
					    sizeof(m), &m))
					goto nla_put_failure;
			}
		}
		nla_nest_end(skb, nest);
	}
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static struct net *vlan_get_link_net(const struct net_device *dev)
{
	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;

	return dev_net(real_dev);
}

struct rtnl_link_ops vlan_link_ops __read_mostly = {
	.kind		= "vlan",
	.maxtype	= IFLA_VLAN_MAX,
	.policy		= vlan_policy,
	.priv_size	= sizeof(struct vlan_dev_priv),
	.setup		= vlan_setup,
	.validate	= vlan_validate,
	.newlink	= vlan_newlink,
	.changelink	= vlan_changelink,
	.dellink	= unregister_vlan_dev,
	.get_size	= vlan_get_size,
	.fill_info	= vlan_fill_info,
	.get_link_net	= vlan_get_link_net,
};

int __init vlan_netlink_init(void)
{
	return rtnl_link_register(&vlan_link_ops);
}

void __exit vlan_netlink_fini(void)
{
	rtnl_link_unregister(&vlan_link_ops);
}

MODULE_ALIAS_RTNL_LINK("vlan");