summaryrefslogtreecommitdiff
path: root/net/openvswitch/vport-vxlan.c
blob: 3277a7520e31320479e0d40bbd66b6dd6f89de59 (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
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/*
 * Copyright (c) 2014 Nicira, Inc.
 * Copyright (c) 2013 Cisco Systems, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/in.h>
#include <linux/ip.h>
#include <linux/net.h>
#include <linux/rculist.h>
#include <linux/udp.h>
#include <linux/module.h>

#include <net/icmp.h>
#include <net/ip.h>
#include <net/udp.h>
#include <net/ip_tunnels.h>
#include <net/rtnetlink.h>
#include <net/route.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/vxlan.h>

#include "datapath.h"
#include "vport.h"
#include "vport-vxlan.h"

/**
 * struct vxlan_port - Keeps track of open UDP ports
 * @vs: vxlan_sock created for the port.
 * @name: vport name.
 */
struct vxlan_port {
	struct vxlan_sock *vs;
	char name[IFNAMSIZ];
	u32 exts; /* VXLAN_F_* in <net/vxlan.h> */
};

static struct vport_ops ovs_vxlan_vport_ops;

static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
{
	return vport_priv(vport);
}

/* Called with rcu_read_lock and BH disabled. */
static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
		      struct vxlan_metadata *md)
{
	struct ovs_tunnel_info tun_info;
	struct vxlan_port *vxlan_port;
	struct vport *vport = vs->data;
	struct iphdr *iph;
	struct ovs_vxlan_opts opts = {
		.gbp = md->gbp,
	};
	__be64 key;
	__be16 flags;

	flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0);
	vxlan_port = vxlan_vport(vport);
	if (vxlan_port->exts & VXLAN_F_GBP && md->gbp)
		flags |= TUNNEL_VXLAN_OPT;

	/* Save outer tunnel values */
	iph = ip_hdr(skb);
	key = cpu_to_be64(ntohl(md->vni) >> 8);
	ovs_flow_tun_info_init(&tun_info, iph,
			       udp_hdr(skb)->source, udp_hdr(skb)->dest,
			       key, flags, &opts, sizeof(opts));

	ovs_vport_receive(vport, skb, &tun_info);
}

static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
{
	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;

	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
		return -EMSGSIZE;

	if (vxlan_port->exts) {
		struct nlattr *exts;

		exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
		if (!exts)
			return -EMSGSIZE;

		if (vxlan_port->exts & VXLAN_F_GBP &&
		    nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
			return -EMSGSIZE;

		nla_nest_end(skb, exts);
	}

	return 0;
}

static void vxlan_tnl_destroy(struct vport *vport)
{
	struct vxlan_port *vxlan_port = vxlan_vport(vport);

	vxlan_sock_release(vxlan_port->vs);

	ovs_vport_deferred_free(vport);
}

static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX+1] = {
	[OVS_VXLAN_EXT_GBP]	= { .type = NLA_FLAG, },
};

static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr)
{
	struct nlattr *exts[OVS_VXLAN_EXT_MAX+1];
	struct vxlan_port *vxlan_port;
	int err;

	if (nla_len(attr) < sizeof(struct nlattr))
		return -EINVAL;

	err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
	if (err < 0)
		return err;

	vxlan_port = vxlan_vport(vport);

	if (exts[OVS_VXLAN_EXT_GBP])
		vxlan_port->exts |= VXLAN_F_GBP;

	return 0;
}

static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
{
	struct net *net = ovs_dp_get_net(parms->dp);
	struct nlattr *options = parms->options;
	struct vxlan_port *vxlan_port;
	struct vxlan_sock *vs;
	struct vport *vport;
	struct nlattr *a;
	u16 dst_port;
	int err;

	if (!options) {
		err = -EINVAL;
		goto error;
	}
	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
	if (a && nla_len(a) == sizeof(u16)) {
		dst_port = nla_get_u16(a);
	} else {
		/* Require destination port from userspace. */
		err = -EINVAL;
		goto error;
	}

	vport = ovs_vport_alloc(sizeof(struct vxlan_port),
				&ovs_vxlan_vport_ops, parms);
	if (IS_ERR(vport))
		return vport;

	vxlan_port = vxlan_vport(vport);
	strncpy(vxlan_port->name, parms->name, IFNAMSIZ);

	a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
	if (a) {
		err = vxlan_configure_exts(vport, a);
		if (err) {
			ovs_vport_free(vport);
			goto error;
		}
	}

	vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true,
			    vxlan_port->exts);
	if (IS_ERR(vs)) {
		ovs_vport_free(vport);
		return (void *)vs;
	}
	vxlan_port->vs = vs;

	return vport;

error:
	return ERR_PTR(err);
}

static int vxlan_ext_gbp(struct sk_buff *skb)
{
	const struct ovs_tunnel_info *tun_info;
	const struct ovs_vxlan_opts *opts;

	tun_info = OVS_CB(skb)->egress_tun_info;
	opts = tun_info->options;

	if (tun_info->tunnel.tun_flags & TUNNEL_VXLAN_OPT &&
	    tun_info->options_len >= sizeof(*opts))
		return opts->gbp;
	else
		return 0;
}

static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
{
	struct net *net = ovs_dp_get_net(vport->dp);
	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
	const struct ovs_key_ipv4_tunnel *tun_key;
	struct vxlan_metadata md = {0};
	struct rtable *rt;
	struct flowi4 fl;
	__be16 src_port;
	__be16 df;
	int err;
	u32 vxflags;

	if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
		err = -EINVAL;
		goto error;
	}

	tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
	rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP);
	if (IS_ERR(rt)) {
		err = PTR_ERR(rt);
		goto error;
	}

	df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
		htons(IP_DF) : 0;

	skb->ignore_df = 1;

	src_port = udp_flow_src_port(net, skb, 0, 0, true);
	md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8);
	md.gbp = vxlan_ext_gbp(skb);
	vxflags = vxlan_port->exts |
		      (tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0);

	err = vxlan_xmit_skb(rt, skb, fl.saddr, tun_key->ipv4_dst,
			     tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
			     src_port, dst_port,
			     &md, false, vxflags);
	if (err < 0)
		ip_rt_put(rt);
	return err;
error:
	kfree_skb(skb);
	return err;
}

static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
				     struct ovs_tunnel_info *egress_tun_info)
{
	struct net *net = ovs_dp_get_net(vport->dp);
	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
	__be16 src_port;
	int port_min;
	int port_max;

	inet_get_local_port_range(net, &port_min, &port_max);
	src_port = udp_flow_src_port(net, skb, 0, 0, true);

	return ovs_tunnel_get_egress_info(egress_tun_info, net,
					  OVS_CB(skb)->egress_tun_info,
					  IPPROTO_UDP, skb->mark,
					  src_port, dst_port);
}

static const char *vxlan_get_name(const struct vport *vport)
{
	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	return vxlan_port->name;
}

static struct vport_ops ovs_vxlan_vport_ops = {
	.type		= OVS_VPORT_TYPE_VXLAN,
	.create		= vxlan_tnl_create,
	.destroy	= vxlan_tnl_destroy,
	.get_name	= vxlan_get_name,
	.get_options	= vxlan_get_options,
	.send		= vxlan_tnl_send,
	.get_egress_tun_info	= vxlan_get_egress_tun_info,
	.owner		= THIS_MODULE,
};

static int __init ovs_vxlan_tnl_init(void)
{
	return ovs_vport_ops_register(&ovs_vxlan_vport_ops);
}

static void __exit ovs_vxlan_tnl_exit(void)
{
	ovs_vport_ops_unregister(&ovs_vxlan_vport_ops);
}

module_init(ovs_vxlan_tnl_init);
module_exit(ovs_vxlan_tnl_exit);

MODULE_DESCRIPTION("OVS: VXLAN switching port");
MODULE_LICENSE("GPL");
MODULE_ALIAS("vport-type-4");