[ovs.git] / datapath / vport-lisp.c

/*
 * Copyright (c) 2011 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/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)

#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 "datapath.h"
#include "tunnel.h"
#include "vport.h"


/*
 *  LISP encapsulation header:
 *
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *  |N|L|E|V|I|flags|            Nonce/Map-Version                  |
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *  |                 Instance ID/Locator Status Bits               |
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 */

/**
 * struct lisphdr - LISP header
 * @nonce_present: Flag indicating the presence of a 24 bit nonce value.
 * @locator_status_bits_present: Flag indicating the presence of Locator Status
 *                               Bits (LSB).
 * @solicit_echo_nonce: Flag indicating the use of the echo noncing mechanism.
 * @map_version_present: Flag indicating the use of mapping versioning.
 * @instance_id_present: Flag indicating the presence of a 24 bit Instance ID.
 * @reserved_flags: 3 bits reserved for future flags.
 * @nonce: 24 bit nonce value.
 * @map_version: 24 bit mapping version.
 * @locator_status_bits: Locator Status Bits: 32 bits when instance_id_present
 *                       is not set, 8 bits when it is.
 * @instance_id: 24 bit Instance ID
 */
struct lisphdr {
#ifdef __LITTLE_ENDIAN_BITFIELD
	__u8 reserved_flags:3;
	__u8 instance_id_present:1;
	__u8 map_version_present:1;
	__u8 solicit_echo_nonce:1;
	__u8 locator_status_bits_present:1;
	__u8 nonce_present:1;
#else
	__u8 nonce_present:1;
	__u8 locator_status_bits_present:1;
	__u8 solicit_echo_nonce:1;
	__u8 map_version_present:1;
	__u8 instance_id_present:1;
	__u8 reserved_flags:3;
#endif
	union {
		__u8 nonce[3];
		__u8 map_version[3];
	} u1;
	union {
		__be32 locator_status_bits;
		struct {
			__u8 instance_id[3];
			__u8 locator_status_bits;
		} word2;
	} u2;
};

#define LISP_HLEN (sizeof(struct udphdr) + sizeof(struct lisphdr))

/**
 * struct lisp_port - Keeps track of open UDP ports
 * @dst_port: lisp UDP port no.
 * @list: list element in @lisp_ports.
 * @lisp_rcv_socket: The socket created for this port number.
 * @name: vport name.
 */
struct lisp_port {
	__be16 dst_port;
	struct list_head list;
	struct socket *lisp_rcv_socket;
	char name[IFNAMSIZ];
};

static LIST_HEAD(lisp_ports);

static inline struct lisp_port *lisp_vport(const struct vport *vport)
{
	return vport_priv(vport);
}

static struct lisp_port *lisp_find_port(struct net *net, __be16 port)
{
	struct lisp_port *lisp_port;

	list_for_each_entry_rcu(lisp_port, &lisp_ports, list) {
		if (lisp_port->dst_port == port &&
			net_eq(sock_net(lisp_port->lisp_rcv_socket->sk), net))
			return lisp_port;
	}

	return NULL;
}

static inline struct lisphdr *lisp_hdr(const struct sk_buff *skb)
{
	return (struct lisphdr *)(udp_hdr(skb) + 1);
}

/* Convert 64 bit tunnel ID to 24 bit Instance ID. */
static void tunnel_id_to_instance_id(__be64 tun_id, __u8 *iid)
{

#ifdef __BIG_ENDIAN
	iid[0] = (__force __u8)(tun_id >> 16);
	iid[1] = (__force __u8)(tun_id >> 8);
	iid[2] = (__force __u8)tun_id;
#else
	iid[0] = (__force __u8)((__force u64)tun_id >> 40);
	iid[1] = (__force __u8)((__force u64)tun_id >> 48);
	iid[2] = (__force __u8)((__force u64)tun_id >> 56);
#endif
}

/* Convert 24 bit Instance ID to 64 bit tunnel ID. */
static __be64 instance_id_to_tunnel_id(__u8 *iid)
{
#ifdef __BIG_ENDIAN
	return (iid[0] << 16) | (iid[1] << 8) | iid[2];
#else
	return (__force __be64)(((__force u64)iid[0] << 40) |
				((__force u64)iid[1] << 48) |
				((__force u64)iid[2] << 56));
#endif
}

static void lisp_build_header(const struct vport *vport,
			      struct sk_buff *skb,
			      int tunnel_hlen)
{
	struct lisp_port *lisp_port = lisp_vport(vport);
	struct udphdr *udph = udp_hdr(skb);
	struct lisphdr *lisph = (struct lisphdr *)(udph + 1);
	const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;

	udph->dest = lisp_port->dst_port;
	udph->source = htons(ovs_tnl_get_src_port(skb));
	udph->check = 0;
	udph->len = htons(skb->len - skb_transport_offset(skb));

	lisph->nonce_present = 0;	/* We don't support echo nonce algorithm */
	lisph->locator_status_bits_present = 1;	/* Set LSB */
	lisph->solicit_echo_nonce = 0;	/* No echo noncing */
	lisph->map_version_present = 0;	/* No mapping versioning, nonce instead */
	lisph->instance_id_present = 1;	/* Store the tun_id as Instance ID  */
	lisph->reserved_flags = 0;	/* Reserved flags, set to 0  */

	lisph->u1.nonce[0] = 0;
	lisph->u1.nonce[1] = 0;
	lisph->u1.nonce[2] = 0;

	tunnel_id_to_instance_id(tun_key->tun_id, &lisph->u2.word2.instance_id[0]);
	lisph->u2.word2.locator_status_bits = 1;
}

/* Called with rcu_read_lock and BH disabled. */
static int lisp_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct lisp_port *lisp_port;
	struct lisphdr *lisph;
	struct iphdr *iph, *inner_iph;
	struct ovs_key_ipv4_tunnel tun_key;
	__be64 key;
	struct ethhdr *ethh;
	__be16 protocol;

	lisp_port = lisp_find_port(dev_net(skb->dev), udp_hdr(skb)->dest);
	if (unlikely(!lisp_port))
		goto error;

	if (unlikely(!pskb_may_pull(skb, LISP_HLEN)))
		goto error;

	lisph = lisp_hdr(skb);

	skb_pull_rcsum(skb, LISP_HLEN);

	if (lisph->instance_id_present != 1)
		key = 0;
	else
		key = instance_id_to_tunnel_id(&lisph->u2.word2.instance_id[0]);

	/* Save outer tunnel values */
	iph = ip_hdr(skb);
	ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);

	/* Drop non-IP inner packets */
	inner_iph = (struct iphdr *)(lisph + 1);
	switch (inner_iph->version) {
	case 4:
		protocol = htons(ETH_P_IP);
		break;
	case 6:
		protocol = htons(ETH_P_IPV6);
		break;
	default:
		goto error;
	}

	/* Add Ethernet header */
	ethh = (struct ethhdr *)skb_push(skb, ETH_HLEN);
	memset(ethh, 0, ETH_HLEN);
	ethh->h_dest[0] = 0x02;
	ethh->h_source[0] = 0x02;
	ethh->h_proto = protocol;

	ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);

	ovs_tnl_rcv(vport_from_priv(lisp_port), skb, &tun_key);
	goto out;

error:
	kfree_skb(skb);
out:
	return 0;
}

/* Arbitrary value.  Irrelevant as long as it's not 0 since we set the handler. */
#define UDP_ENCAP_LISP 1
static int lisp_socket_init(struct lisp_port *lisp_port, struct net *net)
{
	struct sockaddr_in sin;
	int err;

	err = sock_create_kern(AF_INET, SOCK_DGRAM, 0,
			       &lisp_port->lisp_rcv_socket);
	if (err)
		goto error;

	/* release net ref. */
	sk_change_net(lisp_port->lisp_rcv_socket->sk, net);

	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = htonl(INADDR_ANY);
	sin.sin_port = lisp_port->dst_port;

	err = kernel_bind(lisp_port->lisp_rcv_socket, (struct sockaddr *)&sin,
			  sizeof(struct sockaddr_in));
	if (err)
		goto error_sock;

	udp_sk(lisp_port->lisp_rcv_socket->sk)->encap_type = UDP_ENCAP_LISP;
	udp_sk(lisp_port->lisp_rcv_socket->sk)->encap_rcv = lisp_rcv;

	udp_encap_enable();

	return 0;

error_sock:
	sk_release_kernel(lisp_port->lisp_rcv_socket->sk);
error:
	pr_warn("cannot register lisp protocol handler: %d\n", err);
	return err;
}

static int lisp_get_options(const struct vport *vport, struct sk_buff *skb)
{
	struct lisp_port *lisp_port = lisp_vport(vport);

	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(lisp_port->dst_port)))
		return -EMSGSIZE;
	return 0;
}

static void lisp_tnl_destroy(struct vport *vport)
{
	struct lisp_port *lisp_port = lisp_vport(vport);

	list_del_rcu(&lisp_port->list);
	/* Release socket */
	sk_release_kernel(lisp_port->lisp_rcv_socket->sk);

	ovs_vport_deferred_free(vport);
}

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

	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;
	}

	/* Verify if we already have a socket created for this port */
	if (lisp_find_port(net, htons(dst_port))) {
		err = -EEXIST;
		goto error;
	}

	vport = ovs_vport_alloc(sizeof(struct lisp_port),
				&ovs_lisp_vport_ops, parms);
	if (IS_ERR(vport))
		return vport;

	lisp_port = lisp_vport(vport);
	lisp_port->dst_port = htons(dst_port);
	strncpy(lisp_port->name, parms->name, IFNAMSIZ);

	err = lisp_socket_init(lisp_port, net);
	if (err)
		goto error_free;

	list_add_tail_rcu(&lisp_port->list, &lisp_ports);
	return vport;

error_free:
	ovs_vport_free(vport);
error:
	return ERR_PTR(err);
}

static int lisp_tnl_send(struct vport *vport, struct sk_buff *skb)
{
	int tnl_len;
	int network_offset = skb_network_offset(skb);

	if (unlikely(!OVS_CB(skb)->tun_key))
		return -EINVAL;

	/* We only encapsulate IPv4 and IPv6 packets */
	switch (skb->protocol) {
	case htons(ETH_P_IP):
	case htons(ETH_P_IPV6):
		/* Pop off "inner" Ethernet header */
		skb_pull(skb, network_offset);
		tnl_len = ovs_tnl_send(vport, skb, IPPROTO_UDP,
				LISP_HLEN, lisp_build_header);
		return tnl_len > 0 ? tnl_len + network_offset : tnl_len;
	default:
		kfree_skb(skb);
		return 0;
	}
}

static const char *lisp_get_name(const struct vport *vport)
{
	struct lisp_port *lisp_port = lisp_vport(vport);
	return lisp_port->name;
}

const struct vport_ops ovs_lisp_vport_ops = {
	.type		= OVS_VPORT_TYPE_LISP,
	.create		= lisp_tnl_create,
	.destroy	= lisp_tnl_destroy,
	.get_name	= lisp_get_name,
	.get_options	= lisp_get_options,
	.send		= lisp_tnl_send,
};
#else
#warning LISP tunneling will not be available on kernels before 2.6.26
#endif /* Linux kernel < 2.6.26 */
Commit	Line	Data
a6ae068b LJ	1	/*
	2	* Copyright (c) 2011 Nicira, Inc.
	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/version.h>
	23	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
	24
	25	#include <linux/in.h>
	26	#include <linux/ip.h>
a6ae068b	27	#include <linux/net.h>
85c9de19	28	#include <linux/rculist.h>
a6ae068b LJ	29	#include <linux/udp.h>
	30
	31	#include <net/icmp.h>
	32	#include <net/ip.h>
	33	#include <net/udp.h>
	34
	35	#include "datapath.h"
	36	#include "tunnel.h"
	37	#include "vport.h"
	38
	39
	40	/*
	41	* LISP encapsulation header:
	42	*
	43	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	44	* \|N\|L\|E\|V\|I\|flags\| Nonce/Map-Version \|
	45	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	46	* \| Instance ID/Locator Status Bits \|
	47	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	48	*
	49	*/
	50
	51	/**
	52	* struct lisphdr - LISP header
	53	* @nonce_present: Flag indicating the presence of a 24 bit nonce value.
	54	* @locator_status_bits_present: Flag indicating the presence of Locator Status
	55	* Bits (LSB).
	56	* @solicit_echo_nonce: Flag indicating the use of the echo noncing mechanism.
	57	* @map_version_present: Flag indicating the use of mapping versioning.
	58	* @instance_id_present: Flag indicating the presence of a 24 bit Instance ID.
	59	* @reserved_flags: 3 bits reserved for future flags.
	60	* @nonce: 24 bit nonce value.
	61	* @map_version: 24 bit mapping version.
	62	* @locator_status_bits: Locator Status Bits: 32 bits when instance_id_present
	63	* is not set, 8 bits when it is.
	64	* @instance_id: 24 bit Instance ID
	65	*/
	66	struct lisphdr {
	67	#ifdef __LITTLE_ENDIAN_BITFIELD
	68	__u8 reserved_flags:3;
	69	__u8 instance_id_present:1;
	70	__u8 map_version_present:1;
	71	__u8 solicit_echo_nonce:1;
	72	__u8 locator_status_bits_present:1;
	73	__u8 nonce_present:1;
	74	#else
	75	__u8 nonce_present:1;
	76	__u8 locator_status_bits_present:1;
	77	__u8 solicit_echo_nonce:1;
	78	__u8 map_version_present:1;
	79	__u8 instance_id_present:1;
	80	__u8 reserved_flags:3;
	81	#endif
	82	union {
	83	__u8 nonce[3];
	84	__u8 map_version[3];
	85	} u1;
	86	union {
	87	__be32 locator_status_bits;
	88	struct {
	89	__u8 instance_id[3];
	90	__u8 locator_status_bits;
	91	} word2;
	92	} u2;
93	};
94
95	#define LISP_HLEN (sizeof(struct udphdr) + sizeof(struct lisphdr))
96
a6ae068b LJ	97	/**
a6ae068b LJ	98	* struct lisp_port - Keeps track of open UDP ports
c405d282 PS	99	* @dst_port: lisp UDP port no.
	100	* @list: list element in @lisp_ports.
	101	* @lisp_rcv_socket: The socket created for this port number.
	102	* @name: vport name.
a6ae068b LJ	103	*/
a6ae068b LJ	104	struct lisp_port {
c405d282	105	__be16 dst_port;
a6ae068b	106	struct list_head list;
a6ae068b	107	struct socket *lisp_rcv_socket;
c405d282	108	char name[IFNAMSIZ];
a6ae068b LJ	109	};
	110
	111	static LIST_HEAD(lisp_ports);
	112
c405d282 PS	113	static inline struct lisp_port lisp_vport(const struct vport vport)
	114	{
	115	return vport_priv(vport);
	116	}
	117
85c9de19	118	static struct lisp_port lisp_find_port(struct net net, __be16 port)
a6ae068b LJ	119	{
	120	struct lisp_port *lisp_port;
	121
85c9de19	122	list_for_each_entry_rcu(lisp_port, &lisp_ports, list) {
c405d282	123	if (lisp_port->dst_port == port &&
a6ae068b LJ	124	net_eq(sock_net(lisp_port->lisp_rcv_socket->sk), net))
	125	return lisp_port;
	126	}
	127
	128	return NULL;
	129	}
	130
	131	static inline struct lisphdr lisp_hdr(const struct sk_buff skb)
	132	{
	133	return (struct lisphdr *)(udp_hdr(skb) + 1);
	134	}
	135
a6ae068b LJ	136	/* Convert 64 bit tunnel ID to 24 bit Instance ID. */
	137	static void tunnel_id_to_instance_id(__be64 tun_id, __u8 *iid)
	138	{
	139
	140	#ifdef __BIG_ENDIAN
	141	iid[0] = (__force __u8)(tun_id >> 16);
	142	iid[1] = (__force __u8)(tun_id >> 8);
	143	iid[2] = (__force __u8)tun_id;
	144	#else
	145	iid[0] = (__force __u8)((__force u64)tun_id >> 40);
	146	iid[1] = (__force __u8)((__force u64)tun_id >> 48);
	147	iid[2] = (__force __u8)((__force u64)tun_id >> 56);
	148	#endif
	149	}
	150
	151	/* Convert 24 bit Instance ID to 64 bit tunnel ID. */
	152	static __be64 instance_id_to_tunnel_id(__u8 *iid)
	153	{
	154	#ifdef __BIG_ENDIAN
	155	return (iid[0] << 16) \| (iid[1] << 8) \| iid[2];
	156	#else
	157	return (__force __be64)(((__force u64)iid[0] << 40) \|
	158	((__force u64)iid[1] << 48) \|
	159	((__force u64)iid[2] << 56));
	160	#endif
	161	}
	162
85c9de19 PS	163	static void lisp_build_header(const struct vport *vport,
	164	struct sk_buff *skb,
	165	int tunnel_hlen)
a6ae068b	166	{
c405d282	167	struct lisp_port *lisp_port = lisp_vport(vport);
a6ae068b LJ	168	struct udphdr *udph = udp_hdr(skb);
	169	struct lisphdr lisph = (struct lisphdr )(udph + 1);
	170	const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
a6ae068b	171
c405d282	172	udph->dest = lisp_port->dst_port;
a6ae068b LJ	173	udph->source = htons(ovs_tnl_get_src_port(skb));
	174	udph->check = 0;
	175	udph->len = htons(skb->len - skb_transport_offset(skb));
	176
	177	lisph->nonce_present = 0; /* We don't support echo nonce algorithm */
	178	lisph->locator_status_bits_present = 1; /* Set LSB */
	179	lisph->solicit_echo_nonce = 0; /* No echo noncing */
	180	lisph->map_version_present = 0; /* No mapping versioning, nonce instead */
	181	lisph->instance_id_present = 1; /* Store the tun_id as Instance ID */
	182	lisph->reserved_flags = 0; /* Reserved flags, set to 0 */
	183
	184	lisph->u1.nonce[0] = 0;
	185	lisph->u1.nonce[1] = 0;
	186	lisph->u1.nonce[2] = 0;
	187
85c9de19	188	tunnel_id_to_instance_id(tun_key->tun_id, &lisph->u2.word2.instance_id[0]);
a6ae068b	189	lisph->u2.word2.locator_status_bits = 1;
a6ae068b LJ	190	}
	191
	192	/* Called with rcu_read_lock and BH disabled. */
	193	static int lisp_rcv(struct sock sk, struct sk_buff skb)
	194	{
85c9de19	195	struct lisp_port *lisp_port;
a6ae068b	196	struct lisphdr *lisph;
a6ae068b LJ	197	struct iphdr iph, inner_iph;
	198	struct ovs_key_ipv4_tunnel tun_key;
	199	__be64 key;
a6ae068b LJ	200	struct ethhdr *ethh;
	201	__be16 protocol;
	202
85c9de19 PS	203	lisp_port = lisp_find_port(dev_net(skb->dev), udp_hdr(skb)->dest);
	204	if (unlikely(!lisp_port))
	205	goto error;
	206
a6ae068b LJ	207	if (unlikely(!pskb_may_pull(skb, LISP_HLEN)))
	208	goto error;
	209
	210	lisph = lisp_hdr(skb);
	211
	212	skb_pull_rcsum(skb, LISP_HLEN);
	213
	214	if (lisph->instance_id_present != 1)
	215	key = 0;
	216	else
	217	key = instance_id_to_tunnel_id(&lisph->u2.word2.instance_id[0]);
	218
a6ae068b	219	/* Save outer tunnel values */
85c9de19	220	iph = ip_hdr(skb);
adda018c	221	ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);
a6ae068b LJ	222
	223	/* Drop non-IP inner packets */
	224	inner_iph = (struct iphdr *)(lisph + 1);
	225	switch (inner_iph->version) {
	226	case 4:
	227	protocol = htons(ETH_P_IP);
	228	break;
	229	case 6:
	230	protocol = htons(ETH_P_IPV6);
	231	break;
	232	default:
	233	goto error;
	234	}
	235
	236	/* Add Ethernet header */
	237	ethh = (struct ethhdr *)skb_push(skb, ETH_HLEN);
	238	memset(ethh, 0, ETH_HLEN);
	239	ethh->h_dest[0] = 0x02;
	240	ethh->h_source[0] = 0x02;
	241	ethh->h_proto = protocol;
	242
3cfede14 PS	243	ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
3cfede14 PS	244
db0c3134	245	ovs_tnl_rcv(vport_from_priv(lisp_port), skb, &tun_key);
a6ae068b LJ	246	goto out;
	247
	248	error:
	249	kfree_skb(skb);
	250	out:
	251	return 0;
	252	}
	253
	254	/* Arbitrary value. Irrelevant as long as it's not 0 since we set the handler. */
	255	#define UDP_ENCAP_LISP 1
	256	static int lisp_socket_init(struct lisp_port lisp_port, struct net net)
	257	{
a6ae068b	258	struct sockaddr_in sin;
c405d282	259	int err;
a6ae068b LJ	260
	261	err = sock_create_kern(AF_INET, SOCK_DGRAM, 0,
	262	&lisp_port->lisp_rcv_socket);
	263	if (err)
	264	goto error;
	265
	266	/* release net ref. */
	267	sk_change_net(lisp_port->lisp_rcv_socket->sk, net);
	268
	269	sin.sin_family = AF_INET;
	270	sin.sin_addr.s_addr = htonl(INADDR_ANY);
c405d282	271	sin.sin_port = lisp_port->dst_port;
a6ae068b LJ	272
	273	err = kernel_bind(lisp_port->lisp_rcv_socket, (struct sockaddr *)&sin,
	274	sizeof(struct sockaddr_in));
	275	if (err)
	276	goto error_sock;
	277
	278	udp_sk(lisp_port->lisp_rcv_socket->sk)->encap_type = UDP_ENCAP_LISP;
	279	udp_sk(lisp_port->lisp_rcv_socket->sk)->encap_rcv = lisp_rcv;
	280
	281	udp_encap_enable();
	282
	283	return 0;
	284
	285	error_sock:
	286	sk_release_kernel(lisp_port->lisp_rcv_socket->sk);
	287	error:
	288	pr_warn("cannot register lisp protocol handler: %d\n", err);
	289	return err;
	290	}
	291
c405d282	292	static int lisp_get_options(const struct vport vport, struct sk_buff skb)
a6ae068b	293	{
c405d282	294	struct lisp_port *lisp_port = lisp_vport(vport);
a6ae068b	295
c405d282 PS	296	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(lisp_port->dst_port)))
	297	return -EMSGSIZE;
	298	return 0;
a6ae068b LJ	299	}
a6ae068b LJ	300
c405d282	301	static void lisp_tnl_destroy(struct vport *vport)
a6ae068b	302	{
c405d282 PS	303	struct lisp_port *lisp_port = lisp_vport(vport);
c405d282 PS	304
85c9de19 PS	305	list_del_rcu(&lisp_port->list);
	306	/* Release socket */
	307	sk_release_kernel(lisp_port->lisp_rcv_socket->sk);
c405d282 PS	308
c405d282 PS	309	ovs_vport_deferred_free(vport);
85c9de19 PS	310	}
85c9de19 PS	311
c405d282	312	static struct vport lisp_tnl_create(const struct vport_parms parms)
85c9de19	313	{
c405d282 PS	314	struct net *net = ovs_dp_get_net(parms->dp);
c405d282 PS	315	struct nlattr *options = parms->options;
85c9de19	316	struct lisp_port *lisp_port;
c405d282	317	struct vport *vport;
a6ae068b LJ	318	struct nlattr *a;
	319	int err;
	320	u16 dst_port;
a6ae068b LJ	321
	322	if (!options) {
	323	err = -EINVAL;
c405d282	324	goto error;
a6ae068b LJ	325	}
	326
	327	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
	328	if (a && nla_len(a) == sizeof(u16)) {
	329	dst_port = nla_get_u16(a);
	330	} else {
	331	/* Require destination port from userspace. */
	332	err = -EINVAL;
c405d282	333	goto error;
a6ae068b LJ	334	}
	335
	336	/* Verify if we already have a socket created for this port */
c405d282	337	if (lisp_find_port(net, htons(dst_port))) {
85c9de19	338	err = -EEXIST;
c405d282	339	goto error;
a6ae068b LJ	340	}
a6ae068b LJ	341
c405d282 PS	342	vport = ovs_vport_alloc(sizeof(struct lisp_port),
	343	&ovs_lisp_vport_ops, parms);
	344	if (IS_ERR(vport))
	345	return vport;
a6ae068b	346
c405d282 PS	347	lisp_port = lisp_vport(vport);
	348	lisp_port->dst_port = htons(dst_port);
	349	strncpy(lisp_port->name, parms->name, IFNAMSIZ);
a6ae068b LJ	350
	351	err = lisp_socket_init(lisp_port, net);
	352	if (err)
c405d282	353	goto error_free;
a6ae068b	354
c405d282 PS	355	list_add_tail_rcu(&lisp_port->list, &lisp_ports);
c405d282 PS	356	return vport;
a6ae068b	357
c405d282 PS	358	error_free:
c405d282 PS	359	ovs_vport_free(vport);
a6ae068b	360	error:
c405d282	361	return ERR_PTR(err);
a6ae068b LJ	362	}
a6ae068b LJ	363
c405d282	364	static int lisp_tnl_send(struct vport vport, struct sk_buff skb)
a6ae068b	365	{
c405d282 PS	366	int tnl_len;
c405d282 PS	367	int network_offset = skb_network_offset(skb);
a6ae068b	368
be7cd27e PS	369	if (unlikely(!OVS_CB(skb)->tun_key))
be7cd27e PS	370	return -EINVAL;
a6ae068b	371
c405d282 PS	372	/* We only encapsulate IPv4 and IPv6 packets */
	373	switch (skb->protocol) {
	374	case htons(ETH_P_IP):
	375	case htons(ETH_P_IPV6):
	376	/* Pop off "inner" Ethernet header */
	377	skb_pull(skb, network_offset);
	378	tnl_len = ovs_tnl_send(vport, skb, IPPROTO_UDP,
	379	LISP_HLEN, lisp_build_header);
	380	return tnl_len > 0 ? tnl_len + network_offset : tnl_len;
	381	default:
fe7744e8	382	kfree_skb(skb);
be7cd27e	383	return 0;
c405d282	384	}
a6ae068b LJ	385	}
a6ae068b LJ	386
c405d282	387	static const char lisp_get_name(const struct vport vport)
a6ae068b	388	{
c405d282 PS	389	struct lisp_port *lisp_port = lisp_vport(vport);
c405d282 PS	390	return lisp_port->name;
a6ae068b LJ	391	}
	392
	393	const struct vport_ops ovs_lisp_vport_ops = {
	394	.type = OVS_VPORT_TYPE_LISP,
a6ae068b LJ	395	.create = lisp_tnl_create,
a6ae068b LJ	396	.destroy = lisp_tnl_destroy,
c405d282	397	.get_name = lisp_get_name,
85c9de19	398	.get_options = lisp_get_options,
a6ae068b LJ	399	.send = lisp_tnl_send,
	400	};
	401	#else
	402	#warning LISP tunneling will not be available on kernels before 2.6.26
	403	#endif /* Linux kernel < 2.6.26 */