/*
   * L2TP-over-IP socket for L2TPv3.
   *
   * Author: James Chapman <jchapman@katalix.com>
   */
  
  #ifndef _UAPI_LINUX_L2TP_H_
  #define _UAPI_LINUX_L2TP_H_
  
  #include <linux/types.h>
  #include <linux/socket.h>
  #ifndef __KERNEL__
  #include <netinet/in.h>
  #endif
  
  #define IPPROTO_L2TP		115
  
  /**
   * 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[sizeof(struct sockaddr) -
  			      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, offset, data_seq, cookie, peer_cookie, offset, 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 */
  	L2TP_ATTR_DATA_SEQ,		/* u16 */
  	L2TP_ATTR_L2SPEC_TYPE,		/* u8, enum l2tp_l2spec_type */
  	L2TP_ATTR_L2SPEC_LEN,		/* u8, enum l2tp_l2spec_type */
  	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 */
  	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_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_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,
  };
  
  /*
   * NETLINK_GENERIC related info
   */
  #define L2TP_GENL_NAME		"l2tp"
  #define L2TP_GENL_VERSION	0x1
  
  #endif /* _UAPI_LINUX_L2TP_H_ */