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      1 /*
      2  * L2TP-over-IP socket for L2TPv3.
      3  *
      4  * Author: James Chapman <jchapman (at) katalix.com>
      5  */
      6 
      7 #ifndef _UAPI_LINUX_L2TP_H_
      8 #define _UAPI_LINUX_L2TP_H_
      9 
     10 #include <linux/types.h>
     11 #include <linux/socket.h>
     12 #ifndef __KERNEL__
     13 #include <netinet/in.h>
     14 #endif
     15 
     16 #define IPPROTO_L2TP		115
     17 
     18 /**
     19  * struct sockaddr_l2tpip - the sockaddr structure for L2TP-over-IP sockets
     20  * @l2tp_family:  address family number AF_L2TPIP.
     21  * @l2tp_addr:    protocol specific address information
     22  * @l2tp_conn_id: connection id of tunnel
     23  */
     24 #define __SOCK_SIZE__	16		/* sizeof(struct sockaddr)	*/
     25 struct sockaddr_l2tpip {
     26 	/* The first fields must match struct sockaddr_in */
     27 	__kernel_sa_family_t l2tp_family; /* AF_INET */
     28 	__be16		l2tp_unused;	/* INET port number (unused) */
     29 	struct in_addr	l2tp_addr;	/* Internet address */
     30 
     31 	__u32		l2tp_conn_id;	/* Connection ID of tunnel */
     32 
     33 	/* Pad to size of `struct sockaddr'. */
     34 	unsigned char	__pad[sizeof(struct sockaddr) -
     35 			      sizeof(__kernel_sa_family_t) -
     36 			      sizeof(__be16) - sizeof(struct in_addr) -
     37 			      sizeof(__u32)];
     38 };
     39 
     40 /**
     41  * struct sockaddr_l2tpip6 - the sockaddr structure for L2TP-over-IPv6 sockets
     42  * @l2tp_family:  address family number AF_L2TPIP.
     43  * @l2tp_addr:    protocol specific address information
     44  * @l2tp_conn_id: connection id of tunnel
     45  */
     46 struct sockaddr_l2tpip6 {
     47 	/* The first fields must match struct sockaddr_in6 */
     48 	__kernel_sa_family_t l2tp_family; /* AF_INET6 */
     49 	__be16		l2tp_unused;	/* INET port number (unused) */
     50 	__be32		l2tp_flowinfo;	/* IPv6 flow information */
     51 	struct in6_addr	l2tp_addr;	/* IPv6 address */
     52 	__u32		l2tp_scope_id;	/* scope id (new in RFC2553) */
     53 	__u32		l2tp_conn_id;	/* Connection ID of tunnel */
     54 };
     55 
     56 /*****************************************************************************
     57  *  NETLINK_GENERIC netlink family.
     58  *****************************************************************************/
     59 
     60 /*
     61  * Commands.
     62  * Valid TLVs of each command are:-
     63  * TUNNEL_CREATE	- CONN_ID, pw_type, netns, ifname, ipinfo, udpinfo, udpcsum, vlanid
     64  * TUNNEL_DELETE	- CONN_ID
     65  * TUNNEL_MODIFY	- CONN_ID, udpcsum
     66  * TUNNEL_GETSTATS	- CONN_ID, (stats)
     67  * TUNNEL_GET		- CONN_ID, (...)
     68  * SESSION_CREATE	- SESSION_ID, PW_TYPE, offset, data_seq, cookie, peer_cookie, offset, l2spec
     69  * SESSION_DELETE	- SESSION_ID
     70  * SESSION_MODIFY	- SESSION_ID, data_seq
     71  * SESSION_GET		- SESSION_ID, (...)
     72  * SESSION_GETSTATS	- SESSION_ID, (stats)
     73  *
     74  */
     75 enum {
     76 	L2TP_CMD_NOOP,
     77 	L2TP_CMD_TUNNEL_CREATE,
     78 	L2TP_CMD_TUNNEL_DELETE,
     79 	L2TP_CMD_TUNNEL_MODIFY,
     80 	L2TP_CMD_TUNNEL_GET,
     81 	L2TP_CMD_SESSION_CREATE,
     82 	L2TP_CMD_SESSION_DELETE,
     83 	L2TP_CMD_SESSION_MODIFY,
     84 	L2TP_CMD_SESSION_GET,
     85 	__L2TP_CMD_MAX,
     86 };
     87 
     88 #define L2TP_CMD_MAX			(__L2TP_CMD_MAX - 1)
     89 
     90 /*
     91  * ATTR types defined for L2TP
     92  */
     93 enum {
     94 	L2TP_ATTR_NONE,			/* no data */
     95 	L2TP_ATTR_PW_TYPE,		/* u16, enum l2tp_pwtype */
     96 	L2TP_ATTR_ENCAP_TYPE,		/* u16, enum l2tp_encap_type */
     97 	L2TP_ATTR_OFFSET,		/* u16 */
     98 	L2TP_ATTR_DATA_SEQ,		/* u16 */
     99 	L2TP_ATTR_L2SPEC_TYPE,		/* u8, enum l2tp_l2spec_type */
    100 	L2TP_ATTR_L2SPEC_LEN,		/* u8, enum l2tp_l2spec_type */
    101 	L2TP_ATTR_PROTO_VERSION,	/* u8 */
    102 	L2TP_ATTR_IFNAME,		/* string */
    103 	L2TP_ATTR_CONN_ID,		/* u32 */
    104 	L2TP_ATTR_PEER_CONN_ID,		/* u32 */
    105 	L2TP_ATTR_SESSION_ID,		/* u32 */
    106 	L2TP_ATTR_PEER_SESSION_ID,	/* u32 */
    107 	L2TP_ATTR_UDP_CSUM,		/* u8 */
    108 	L2TP_ATTR_VLAN_ID,		/* u16 */
    109 	L2TP_ATTR_COOKIE,		/* 0, 4 or 8 bytes */
    110 	L2TP_ATTR_PEER_COOKIE,		/* 0, 4 or 8 bytes */
    111 	L2TP_ATTR_DEBUG,		/* u32 */
    112 	L2TP_ATTR_RECV_SEQ,		/* u8 */
    113 	L2TP_ATTR_SEND_SEQ,		/* u8 */
    114 	L2TP_ATTR_LNS_MODE,		/* u8 */
    115 	L2TP_ATTR_USING_IPSEC,		/* u8 */
    116 	L2TP_ATTR_RECV_TIMEOUT,		/* msec */
    117 	L2TP_ATTR_FD,			/* int */
    118 	L2TP_ATTR_IP_SADDR,		/* u32 */
    119 	L2TP_ATTR_IP_DADDR,		/* u32 */
    120 	L2TP_ATTR_UDP_SPORT,		/* u16 */
    121 	L2TP_ATTR_UDP_DPORT,		/* u16 */
    122 	L2TP_ATTR_MTU,			/* u16 */
    123 	L2TP_ATTR_MRU,			/* u16 */
    124 	L2TP_ATTR_STATS,		/* nested */
    125 	L2TP_ATTR_IP6_SADDR,		/* struct in6_addr */
    126 	L2TP_ATTR_IP6_DADDR,		/* struct in6_addr */
    127 	L2TP_ATTR_UDP_ZERO_CSUM6_TX,	/* u8 */
    128 	L2TP_ATTR_UDP_ZERO_CSUM6_RX,	/* u8 */
    129 	__L2TP_ATTR_MAX,
    130 };
    131 
    132 #define L2TP_ATTR_MAX			(__L2TP_ATTR_MAX - 1)
    133 
    134 /* Nested in L2TP_ATTR_STATS */
    135 enum {
    136 	L2TP_ATTR_STATS_NONE,		/* no data */
    137 	L2TP_ATTR_TX_PACKETS,		/* u64 */
    138 	L2TP_ATTR_TX_BYTES,		/* u64 */
    139 	L2TP_ATTR_TX_ERRORS,		/* u64 */
    140 	L2TP_ATTR_RX_PACKETS,		/* u64 */
    141 	L2TP_ATTR_RX_BYTES,		/* u64 */
    142 	L2TP_ATTR_RX_SEQ_DISCARDS,	/* u64 */
    143 	L2TP_ATTR_RX_OOS_PACKETS,	/* u64 */
    144 	L2TP_ATTR_RX_ERRORS,		/* u64 */
    145 	__L2TP_ATTR_STATS_MAX,
    146 };
    147 
    148 #define L2TP_ATTR_STATS_MAX		(__L2TP_ATTR_STATS_MAX - 1)
    149 
    150 enum l2tp_pwtype {
    151 	L2TP_PWTYPE_NONE = 0x0000,
    152 	L2TP_PWTYPE_ETH_VLAN = 0x0004,
    153 	L2TP_PWTYPE_ETH = 0x0005,
    154 	L2TP_PWTYPE_PPP = 0x0007,
    155 	L2TP_PWTYPE_PPP_AC = 0x0008,
    156 	L2TP_PWTYPE_IP = 0x000b,
    157 	__L2TP_PWTYPE_MAX
    158 };
    159 
    160 enum l2tp_l2spec_type {
    161 	L2TP_L2SPECTYPE_NONE,
    162 	L2TP_L2SPECTYPE_DEFAULT,
    163 };
    164 
    165 enum l2tp_encap_type {
    166 	L2TP_ENCAPTYPE_UDP,
    167 	L2TP_ENCAPTYPE_IP,
    168 };
    169 
    170 enum l2tp_seqmode {
    171 	L2TP_SEQ_NONE = 0,
    172 	L2TP_SEQ_IP = 1,
    173 	L2TP_SEQ_ALL = 2,
    174 };
    175 
    176 /*
    177  * NETLINK_GENERIC related info
    178  */
    179 #define L2TP_GENL_NAME		"l2tp"
    180 #define L2TP_GENL_VERSION	0x1
    181 #define L2TP_GENL_MCGROUP       "l2tp"
    182 
    183 #endif /* _UAPI_LINUX_L2TP_H_ */
    184