[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 <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 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_key_ipv4_tunnel tun_key;
	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_key_init(&tun_key, iph, key, TUNNEL_KEY);

	ovs_vport_receive(vport, skb, &tun_key);
}

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_key)) {
		err = -EINVAL;
		goto error;
	}

	tun_key = OVS_CB(skb)->egress_tun_key;
	/* 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;
}

const 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,
};
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>
	27
	28	#include <net/icmp.h>
	29	#include <net/ip.h>
	30	#include <net/udp.h>
	31	#include <net/ip_tunnels.h>
58264848 PS	32	#include <net/rtnetlink.h>
	33	#include <net/route.h>
	34	#include <net/dsfield.h>
	35	#include <net/inet_ecn.h>
	36	#include <net/net_namespace.h>
	37	#include <net/netns/generic.h>
	38	#include <net/vxlan.h>
	39
	40	#include "datapath.h"
	41	#include "vport.h"
	42
	43	/**
	44	* struct vxlan_port - Keeps track of open UDP ports
	45	* @vs: vxlan_sock created for the port.
	46	* @name: vport name.
	47	*/
	48	struct vxlan_port {
	49	struct vxlan_sock *vs;
	50	char name[IFNAMSIZ];
	51	};
	52
	53	static inline struct vxlan_port vxlan_vport(const struct vport vport)
	54	{
	55	return vport_priv(vport);
	56	}
	57
	58	/* Called with rcu_read_lock and BH disabled. */
	59	static void vxlan_rcv(struct vxlan_sock vs, struct sk_buff skb, __be32 vx_vni)
	60	{
	61	struct ovs_key_ipv4_tunnel tun_key;
	62	struct vport *vport = vs->data;
	63	struct iphdr *iph;
	64	__be64 key;
	65
	66	/* Save outer tunnel values */
	67	iph = ip_hdr(skb);
	68	key = cpu_to_be64(ntohl(vx_vni) >> 8);
	69	ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);
	70
	71	ovs_vport_receive(vport, skb, &tun_key);
	72	}
	73
	74	static int vxlan_get_options(const struct vport vport, struct sk_buff skb)
	75	{
	76	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	77	__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
	78
	79	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
	80	return -EMSGSIZE;
	81	return 0;
	82	}
	83
	84	static void vxlan_tnl_destroy(struct vport *vport)
	85	{
	86	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	87
	88	vxlan_sock_release(vxlan_port->vs);
	89
	90	ovs_vport_deferred_free(vport);
	91	}
	92
	93	static struct vport vxlan_tnl_create(const struct vport_parms parms)
	94	{
	95	struct net *net = ovs_dp_get_net(parms->dp);
96	struct nlattr *options = parms->options;
97	struct vxlan_port *vxlan_port;
98	struct vxlan_sock *vs;
99	struct vport *vport;
100	struct nlattr *a;
101	u16 dst_port;
102	int err;
103
104	if (!options) {
105	err = -EINVAL;
106	goto error;
107	}
108	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
109	if (a && nla_len(a) == sizeof(u16)) {
110	dst_port = nla_get_u16(a);
111	} else {
112	/* Require destination port from userspace. */
113	err = -EINVAL;
114	goto error;
115	}
116
117	vport = ovs_vport_alloc(sizeof(struct vxlan_port),
118	&ovs_vxlan_vport_ops, parms);
119	if (IS_ERR(vport))
120	return vport;
121
122	vxlan_port = vxlan_vport(vport);
123	strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
124
359a0ea9	125	vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, 0);
58264848 PS	126	if (IS_ERR(vs)) {
	127	ovs_vport_free(vport);
	128	return (void *)vs;
	129	}
	130	vxlan_port->vs = vs;
	131
	132	return vport;
	133
	134	error:
	135	return ERR_PTR(err);
	136	}
	137
	138	static int vxlan_tnl_send(struct vport vport, struct sk_buff skb)
	139	{
	140	struct net *net = ovs_dp_get_net(vport->dp);
	141	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	142	__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
8c8b1b83	143	struct ovs_key_ipv4_tunnel *tun_key;
58264848 PS	144	struct rtable *rt;
	145	struct flowi4 fl;
	146	__be16 src_port;
58264848 PS	147	__be16 df;
	148	int err;
	149
8c8b1b83	150	if (unlikely(!OVS_CB(skb)->egress_tun_key)) {
58264848 PS	151	err = -EINVAL;
	152	goto error;
	153	}
	154
8c8b1b83	155	tun_key = OVS_CB(skb)->egress_tun_key;
58264848 PS	156	/* Route lookup */
58264848 PS	157	memset(&fl, 0, sizeof(fl));
8c8b1b83 PS	158	fl.daddr = tun_key->ipv4_dst;
	159	fl.saddr = tun_key->ipv4_src;
	160	fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos);
58264848 PS	161	fl.flowi4_mark = skb->mark;
	162	fl.flowi4_proto = IPPROTO_UDP;
	163
	164	rt = ip_route_output_key(net, &fl);
	165	if (IS_ERR(rt)) {
	166	err = PTR_ERR(rt);
	167	goto error;
	168	}
	169
8c8b1b83	170	df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
58264848 PS	171	htons(IP_DF) : 0;
58264848 PS	172
60ff7467	173	skb->ignore_df = 1;
58264848	174
535fb8d0	175	src_port = udp_flow_src_port(net, skb, 0, 0, true);
58264848	176
11796187	177	err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
8c8b1b83 PS	178	fl.saddr, tun_key->ipv4_dst,
8c8b1b83 PS	179	tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
58264848	180	src_port, dst_port,
8c8b1b83	181	htonl(be64_to_cpu(tun_key->tun_id) << 8),
f01ec1c0	182	false);
58264848 PS	183	if (err < 0)
	184	ip_rt_put(rt);
	185	error:
	186	return err;
	187	}
	188
	189	static const char vxlan_get_name(const struct vport vport)
	190	{
	191	struct vxlan_port *vxlan_port = vxlan_vport(vport);
	192	return vxlan_port->name;
	193	}
	194
	195	const struct vport_ops ovs_vxlan_vport_ops = {
	196	.type = OVS_VPORT_TYPE_VXLAN,
	197	.create = vxlan_tnl_create,
	198	.destroy = vxlan_tnl_destroy,
	199	.get_name = vxlan_get_name,
	200	.get_options = vxlan_get_options,
	201	.send = vxlan_tnl_send,
	202	};