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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* L2TP-over-IP socket for L2TPv3.
*
* Author: James Chapman <jchapman@katalix.com>
*/
#ifndef _LINUX_L2TP_H_
#define _LINUX_L2TP_H_
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
/**
* struct sockaddr_l2tpip - the sockaddr structure for L2TP-over-IP sockets
* @l2tp_family: address family number AF_L2TPIP.
* @l2tp_addr: protocol specific address information
* @l2tp_conn_id: connection id of tunnel
*/
#define __SOCK_SIZE__ 16 /* sizeof(struct sockaddr) */
struct sockaddr_l2tpip {
/* The first fields must match struct sockaddr_in */
__kernel_sa_family_t l2tp_family; /* AF_INET */
__be16 l2tp_unused; /* INET port number (unused) */
struct in_addr l2tp_addr; /* Internet address */
__u32 l2tp_conn_id; /* Connection ID of tunnel */
/* Pad to size of `struct sockaddr'. */
unsigned char __pad[__SOCK_SIZE__ -
sizeof(__kernel_sa_family_t) -
sizeof(__be16) - sizeof(struct in_addr) -
sizeof(__u32)];
};
/**
* struct sockaddr_l2tpip6 - the sockaddr structure for L2TP-over-IPv6 sockets
* @l2tp_family: address family number AF_L2TPIP.
* @l2tp_addr: protocol specific address information
* @l2tp_conn_id: connection id of tunnel
*/
struct sockaddr_l2tpip6 {
/* The first fields must match struct sockaddr_in6 */
__kernel_sa_family_t l2tp_family; /* AF_INET6 */
__be16 l2tp_unused; /* INET port number (unused) */
__be32 l2tp_flowinfo; /* IPv6 flow information */
struct in6_addr l2tp_addr; /* IPv6 address */
__u32 l2tp_scope_id; /* scope id (new in RFC2553) */
__u32 l2tp_conn_id; /* Connection ID of tunnel */
};
/*****************************************************************************
* NETLINK_GENERIC netlink family.
*****************************************************************************/
/*
* Commands.
* Valid TLVs of each command are:-
* TUNNEL_CREATE - CONN_ID, pw_type, netns, ifname, ipinfo, udpinfo, udpcsum, vlanid
* TUNNEL_DELETE - CONN_ID
* TUNNEL_MODIFY - CONN_ID, udpcsum
* TUNNEL_GETSTATS - CONN_ID, (stats)
* TUNNEL_GET - CONN_ID, (...)
* SESSION_CREATE - SESSION_ID, PW_TYPE, data_seq, cookie, peer_cookie, l2spec
* SESSION_DELETE - SESSION_ID
* SESSION_MODIFY - SESSION_ID, data_seq
* SESSION_GET - SESSION_ID, (...)
* SESSION_GETSTATS - SESSION_ID, (stats)
*
*/
enum {
L2TP_CMD_NOOP,
L2TP_CMD_TUNNEL_CREATE,
L2TP_CMD_TUNNEL_DELETE,
L2TP_CMD_TUNNEL_MODIFY,
L2TP_CMD_TUNNEL_GET,
L2TP_CMD_SESSION_CREATE,
L2TP_CMD_SESSION_DELETE,
L2TP_CMD_SESSION_MODIFY,
L2TP_CMD_SESSION_GET,
__L2TP_CMD_MAX,
};
#define L2TP_CMD_MAX (__L2TP_CMD_MAX - 1)
/*
* ATTR types defined for L2TP
*/
enum {
L2TP_ATTR_NONE, /* no data */
L2TP_ATTR_PW_TYPE, /* u16, enum l2tp_pwtype */
L2TP_ATTR_ENCAP_TYPE, /* u16, enum l2tp_encap_type */
L2TP_ATTR_OFFSET, /* u16 (not used) */
L2TP_ATTR_DATA_SEQ, /* u16 */
L2TP_ATTR_L2SPEC_TYPE, /* u8, enum l2tp_l2spec_type */
L2TP_ATTR_L2SPEC_LEN, /* u8 (not used) */
L2TP_ATTR_PROTO_VERSION, /* u8 */
L2TP_ATTR_IFNAME, /* string */
L2TP_ATTR_CONN_ID, /* u32 */
L2TP_ATTR_PEER_CONN_ID, /* u32 */
L2TP_ATTR_SESSION_ID, /* u32 */
L2TP_ATTR_PEER_SESSION_ID, /* u32 */
L2TP_ATTR_UDP_CSUM, /* u8 */
L2TP_ATTR_VLAN_ID, /* u16 */
L2TP_ATTR_COOKIE, /* 0, 4 or 8 bytes */
L2TP_ATTR_PEER_COOKIE, /* 0, 4 or 8 bytes */
L2TP_ATTR_DEBUG, /* u32, enum l2tp_debug_flags */
L2TP_ATTR_RECV_SEQ, /* u8 */
L2TP_ATTR_SEND_SEQ, /* u8 */
L2TP_ATTR_LNS_MODE, /* u8 */
L2TP_ATTR_USING_IPSEC, /* u8 */
L2TP_ATTR_RECV_TIMEOUT, /* msec */
L2TP_ATTR_FD, /* int */
L2TP_ATTR_IP_SADDR, /* u32 */
L2TP_ATTR_IP_DADDR, /* u32 */
L2TP_ATTR_UDP_SPORT, /* u16 */
L2TP_ATTR_UDP_DPORT, /* u16 */
L2TP_ATTR_MTU, /* u16 */
L2TP_ATTR_MRU, /* u16 */
L2TP_ATTR_STATS, /* nested */
L2TP_ATTR_IP6_SADDR, /* struct in6_addr */
L2TP_ATTR_IP6_DADDR, /* struct in6_addr */
L2TP_ATTR_UDP_ZERO_CSUM6_TX, /* flag */
L2TP_ATTR_UDP_ZERO_CSUM6_RX, /* flag */
L2TP_ATTR_PAD,
__L2TP_ATTR_MAX,
};
#define L2TP_ATTR_MAX (__L2TP_ATTR_MAX - 1)
/* Nested in L2TP_ATTR_STATS */
enum {
L2TP_ATTR_STATS_NONE, /* no data */
L2TP_ATTR_TX_PACKETS, /* u64 */
L2TP_ATTR_TX_BYTES, /* u64 */
L2TP_ATTR_TX_ERRORS, /* u64 */
L2TP_ATTR_RX_PACKETS, /* u64 */
L2TP_ATTR_RX_BYTES, /* u64 */
L2TP_ATTR_RX_SEQ_DISCARDS, /* u64 */
L2TP_ATTR_RX_OOS_PACKETS, /* u64 */
L2TP_ATTR_RX_ERRORS, /* u64 */
L2TP_ATTR_STATS_PAD,
__L2TP_ATTR_STATS_MAX,
};
#define L2TP_ATTR_STATS_MAX (__L2TP_ATTR_STATS_MAX - 1)
enum l2tp_pwtype {
L2TP_PWTYPE_NONE = 0x0000,
L2TP_PWTYPE_ETH_VLAN = 0x0004,
L2TP_PWTYPE_ETH = 0x0005,
L2TP_PWTYPE_PPP = 0x0007,
L2TP_PWTYPE_PPP_AC = 0x0008,
L2TP_PWTYPE_IP = 0x000b,
__L2TP_PWTYPE_MAX
};
enum l2tp_l2spec_type {
L2TP_L2SPECTYPE_NONE,
L2TP_L2SPECTYPE_DEFAULT,
};
enum l2tp_encap_type {
L2TP_ENCAPTYPE_UDP,
L2TP_ENCAPTYPE_IP,
};
enum l2tp_seqmode {
L2TP_SEQ_NONE = 0,
L2TP_SEQ_IP = 1,
L2TP_SEQ_ALL = 2,
};
/**
* enum l2tp_debug_flags - debug message categories for L2TP tunnels/sessions
*
* @L2TP_MSG_DEBUG: verbose debug (if compiled in)
* @L2TP_MSG_CONTROL: userspace - kernel interface
* @L2TP_MSG_SEQ: sequence numbers
* @L2TP_MSG_DATA: data packets
*/
enum l2tp_debug_flags {
L2TP_MSG_DEBUG = (1 << 0),
L2TP_MSG_CONTROL = (1 << 1),
L2TP_MSG_SEQ = (1 << 2),
L2TP_MSG_DATA = (1 << 3),
};
/*
* NETLINK_GENERIC related info
*/
#define L2TP_GENL_NAME "l2tp"
#define L2TP_GENL_VERSION 0x1
#define L2TP_GENL_MCGROUP "l2tp"
#endif /* _LINUX_L2TP_H_ */