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l2tp.h
/* 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_ */
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