[deliverable/linux.git] / net / openvswitch / vport-vxlan.c

/*
 * 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"

/**
 * 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];
};

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, __be32 vx_vni)
{
	struct ovs_tunnel_info tun_info;
	struct vport *vport = vs->data;
	struct iphdr *iph;
	__be64 key;

	/* Save outer tunnel values */
	iph = ip_hdr(skb);
	key = cpu_to_be64(ntohl(vx_vni) >> 8);
	ovs_flow_tun_info_init(&tun_info, iph, key, TUNNEL_KEY, NULL, 0);

	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;
	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 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);

	vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, 0);
	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_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;
	struct ovs_key_ipv4_tunnel *tun_key;
	struct rtable *rt;
	struct flowi4 fl;
	__be16 src_port;
	__be16 df;
	int err;

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

	tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
	/* Route lookup */
	memset(&fl, 0, sizeof(fl));
	fl.daddr = tun_key->ipv4_dst;
	fl.saddr = tun_key->ipv4_src;
	fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos);
	fl.flowi4_mark = skb->mark;
	fl.flowi4_proto = IPPROTO_UDP;

	rt = ip_route_output_key(net, &fl);
	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);

	err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
			     fl.saddr, tun_key->ipv4_dst,
			     tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
			     src_port, dst_port,
			     htonl(be64_to_cpu(tun_key->tun_id) << 8),
			     false);
	if (err < 0)
		ip_rt_put(rt);
error:
	return err;
}

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,
	.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");
Commit	Line	Data
58264848	1	/*
8c8b1b83	2	* Copyright (c) 2014 Nicira, Inc.
58264848 PS	3	* Copyright (c) 2013 Cisco Systems, Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of version 2 of the GNU General Public
	7	* License as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	17	* 02110-1301, USA
	18	*/
	19
	20	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	21
	22	#include <linux/in.h>
	23	#include <linux/ip.h>
	24	#include <linux/net.h>
	25	#include <linux/rculist.h>
	26	#include <linux/udp.h>
62b9c8d0	27	#include <linux/module.h>
58264848 PS	28
	29	#include <net/icmp.h>
	30	#include <net/ip.h>
	31	#include <net/udp.h>
	32	#include <net/ip_tunnels.h>
58264848 PS	33	#include <net/rtnetlink.h>
	34	#include <net/route.h>
	35	#include <net/dsfield.h>
	36	#include <net/inet_ecn.h>
	37	#include <net/net_namespace.h>
	38	#include <net/netns/generic.h>
	39	#include <net/vxlan.h>
	40
	41	#include "datapath.h"
	42	#include "vport.h"
	43
	44	/**
	45	* struct vxlan_port - Keeps track of open UDP ports
	46	* @vs: vxlan_sock created for the port.
	47	* @name: vport name.
	48	*/
	49	struct vxlan_port {
	50	struct vxlan_sock *vs;
	51	char name[IFNAMSIZ];
	52	};
	53
62b9c8d0 TG	54	static struct vport_ops ovs_vxlan_vport_ops;
62b9c8d0 TG	55
58264848 PS	56	static inline struct vxlan_port vxlan_vport(const struct vport vport)
	57	{
	58	return vport_priv(vport);
	59	}
	60
	61	/* Called with rcu_read_lock and BH disabled. */
	62	static void vxlan_rcv(struct vxlan_sock vs, struct sk_buff skb, __be32 vx_vni)
	63	{
f0b128c1	64	struct ovs_tunnel_info tun_info;
58264848 PS	65	struct vport *vport = vs->data;
	66	struct iphdr *iph;
	67	__be64 key;
	68
	69	/* Save outer tunnel values */
	70	iph = ip_hdr(skb);
	71	key = cpu_to_be64(ntohl(vx_vni) >> 8);
f5796684	72	ovs_flow_tun_info_init(&tun_info, iph, key, TUNNEL_KEY, NULL, 0);
58264848	73
f0b128c1	74	ovs_vport_receive(vport, skb, &tun_info);
58264848 PS	75	}
	76
	77	static int vxlan_get_options(const struct vport vport, struct sk_buff skb)
	78	{
	79	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	80	__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
	81
	82	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
	83	return -EMSGSIZE;
	84	return 0;
	85	}
	86
	87	static void vxlan_tnl_destroy(struct vport *vport)
	88	{
	89	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	90
	91	vxlan_sock_release(vxlan_port->vs);
	92
	93	ovs_vport_deferred_free(vport);
	94	}
	95
	96	static struct vport vxlan_tnl_create(const struct vport_parms parms)
	97	{
	98	struct net *net = ovs_dp_get_net(parms->dp);
	99	struct nlattr *options = parms->options;
	100	struct vxlan_port *vxlan_port;
	101	struct vxlan_sock *vs;
	102	struct vport *vport;
	103	struct nlattr *a;
	104	u16 dst_port;
	105	int err;
	106
	107	if (!options) {
	108	err = -EINVAL;
	109	goto error;
	110	}
	111	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
	112	if (a && nla_len(a) == sizeof(u16)) {
	113	dst_port = nla_get_u16(a);
	114	} else {
	115	/* Require destination port from userspace. */
	116	err = -EINVAL;
	117	goto error;
	118	}
	119
	120	vport = ovs_vport_alloc(sizeof(struct vxlan_port),
	121	&ovs_vxlan_vport_ops, parms);
	122	if (IS_ERR(vport))
	123	return vport;
	124
	125	vxlan_port = vxlan_vport(vport);
	126	strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
	127
359a0ea9	128	vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, 0);
58264848 PS	129	if (IS_ERR(vs)) {
	130	ovs_vport_free(vport);
	131	return (void *)vs;
	132	}
	133	vxlan_port->vs = vs;
	134
	135	return vport;
	136
	137	error:
	138	return ERR_PTR(err);
	139	}
	140
	141	static int vxlan_tnl_send(struct vport vport, struct sk_buff skb)
	142	{
	143	struct net *net = ovs_dp_get_net(vport->dp);
	144	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	145	__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
8c8b1b83	146	struct ovs_key_ipv4_tunnel *tun_key;
58264848 PS	147	struct rtable *rt;
	148	struct flowi4 fl;
	149	__be16 src_port;
58264848 PS	150	__be16 df;
	151	int err;
	152
f0b128c1	153	if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
58264848 PS	154	err = -EINVAL;
	155	goto error;
	156	}
	157
f0b128c1	158	tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
58264848 PS	159	/* Route lookup */
58264848 PS	160	memset(&fl, 0, sizeof(fl));
8c8b1b83 PS	161	fl.daddr = tun_key->ipv4_dst;
	162	fl.saddr = tun_key->ipv4_src;
	163	fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos);
58264848 PS	164	fl.flowi4_mark = skb->mark;
	165	fl.flowi4_proto = IPPROTO_UDP;
	166
	167	rt = ip_route_output_key(net, &fl);
	168	if (IS_ERR(rt)) {
	169	err = PTR_ERR(rt);
	170	goto error;
	171	}
	172
8c8b1b83	173	df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
58264848 PS	174	htons(IP_DF) : 0;
58264848 PS	175
60ff7467	176	skb->ignore_df = 1;
58264848	177
535fb8d0	178	src_port = udp_flow_src_port(net, skb, 0, 0, true);
58264848	179
11796187	180	err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
8c8b1b83 PS	181	fl.saddr, tun_key->ipv4_dst,
8c8b1b83 PS	182	tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
58264848	183	src_port, dst_port,
8c8b1b83	184	htonl(be64_to_cpu(tun_key->tun_id) << 8),
f01ec1c0	185	false);
58264848 PS	186	if (err < 0)
	187	ip_rt_put(rt);
	188	error:
	189	return err;
	190	}
	191
	192	static const char vxlan_get_name(const struct vport vport)
	193	{
	194	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	195	return vxlan_port->name;
	196	}
	197
62b9c8d0	198	static struct vport_ops ovs_vxlan_vport_ops = {
58264848 PS	199	.type = OVS_VPORT_TYPE_VXLAN,
	200	.create = vxlan_tnl_create,
	201	.destroy = vxlan_tnl_destroy,
	202	.get_name = vxlan_get_name,
	203	.get_options = vxlan_get_options,
	204	.send = vxlan_tnl_send,
62b9c8d0	205	.owner = THIS_MODULE,
58264848	206	};
62b9c8d0 TG	207
	208	static int __init ovs_vxlan_tnl_init(void)
	209	{
	210	return ovs_vport_ops_register(&ovs_vxlan_vport_ops);
	211	}
	212
	213	static void __exit ovs_vxlan_tnl_exit(void)
	214	{
	215	ovs_vport_ops_unregister(&ovs_vxlan_vport_ops);
	216	}
	217
	218	module_init(ovs_vxlan_tnl_init);
	219	module_exit(ovs_vxlan_tnl_exit);
	220
	221	MODULE_DESCRIPTION("OVS: VXLAN switching port");
	222	MODULE_LICENSE("GPL");
	223	MODULE_ALIAS("vport-type-4");