1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2/* 3 * L2TP-over-IP socket for L2TPv3. 4 * 5 * Author: James Chapman <jchapman@katalix.com> 6 */ 7 8#ifndef _UAPI_LINUX_L2TP_H_ 9#define _UAPI_LINUX_L2TP_H_ 10 11#include <linux/types.h> 12#include <linux/socket.h> 13#include <linux/in.h> 14#include <linux/in6.h> 15 16/** 17 * struct sockaddr_l2tpip - the sockaddr structure for L2TP-over-IP sockets 18 * @l2tp_family: address family number AF_L2TPIP. 19 * @l2tp_addr: protocol specific address information 20 * @l2tp_conn_id: connection id of tunnel 21 */ 22#define __SOCK_SIZE__ 16 /* sizeof(struct sockaddr) */ 23struct sockaddr_l2tpip { 24 /* The first fields must match struct sockaddr_in */ 25 __kernel_sa_family_t l2tp_family; /* AF_INET */ 26 __be16 l2tp_unused; /* INET port number (unused) */ 27 struct in_addr l2tp_addr; /* Internet address */ 28 29 __u32 l2tp_conn_id; /* Connection ID of tunnel */ 30 31 /* Pad to size of `struct sockaddr'. */ 32 unsigned char __pad[__SOCK_SIZE__ - 33 sizeof(__kernel_sa_family_t) - 34 sizeof(__be16) - sizeof(struct in_addr) - 35 sizeof(__u32)]; 36}; 37 38/** 39 * struct sockaddr_l2tpip6 - the sockaddr structure for L2TP-over-IPv6 sockets 40 * @l2tp_family: address family number AF_L2TPIP. 41 * @l2tp_addr: protocol specific address information 42 * @l2tp_conn_id: connection id of tunnel 43 */ 44struct sockaddr_l2tpip6 { 45 /* The first fields must match struct sockaddr_in6 */ 46 __kernel_sa_family_t l2tp_family; /* AF_INET6 */ 47 __be16 l2tp_unused; /* INET port number (unused) */ 48 __be32 l2tp_flowinfo; /* IPv6 flow information */ 49 struct in6_addr l2tp_addr; /* IPv6 address */ 50 __u32 l2tp_scope_id; /* scope id (new in RFC2553) */ 51 __u32 l2tp_conn_id; /* Connection ID of tunnel */ 52}; 53 54/***************************************************************************** 55 * NETLINK_GENERIC netlink family. 56 *****************************************************************************/ 57 58/* 59 * Commands. 60 * Valid TLVs of each command are:- 61 * TUNNEL_CREATE - CONN_ID, pw_type, netns, ifname, ipinfo, udpinfo, udpcsum 62 * TUNNEL_DELETE - CONN_ID 63 * TUNNEL_MODIFY - CONN_ID, udpcsum 64 * TUNNEL_GETSTATS - CONN_ID, (stats) 65 * TUNNEL_GET - CONN_ID, (...) 66 * SESSION_CREATE - SESSION_ID, PW_TYPE, cookie, peer_cookie, l2spec 67 * SESSION_DELETE - SESSION_ID 68 * SESSION_MODIFY - SESSION_ID 69 * SESSION_GET - SESSION_ID, (...) 70 * SESSION_GETSTATS - SESSION_ID, (stats) 71 * 72 */ 73enum { 74 L2TP_CMD_NOOP, 75 L2TP_CMD_TUNNEL_CREATE, 76 L2TP_CMD_TUNNEL_DELETE, 77 L2TP_CMD_TUNNEL_MODIFY, 78 L2TP_CMD_TUNNEL_GET, 79 L2TP_CMD_SESSION_CREATE, 80 L2TP_CMD_SESSION_DELETE, 81 L2TP_CMD_SESSION_MODIFY, 82 L2TP_CMD_SESSION_GET, 83 __L2TP_CMD_MAX, 84}; 85 86#define L2TP_CMD_MAX (__L2TP_CMD_MAX - 1) 87 88/* 89 * ATTR types defined for L2TP 90 */ 91enum { 92 L2TP_ATTR_NONE, /* no data */ 93 L2TP_ATTR_PW_TYPE, /* u16, enum l2tp_pwtype */ 94 L2TP_ATTR_ENCAP_TYPE, /* u16, enum l2tp_encap_type */ 95 L2TP_ATTR_OFFSET, /* u16 (not used) */ 96 L2TP_ATTR_DATA_SEQ, /* u16 (not used) */ 97 L2TP_ATTR_L2SPEC_TYPE, /* u8, enum l2tp_l2spec_type */ 98 L2TP_ATTR_L2SPEC_LEN, /* u8 (not used) */ 99 L2TP_ATTR_PROTO_VERSION, /* u8 */ 100 L2TP_ATTR_IFNAME, /* string */ 101 L2TP_ATTR_CONN_ID, /* u32 */ 102 L2TP_ATTR_PEER_CONN_ID, /* u32 */ 103 L2TP_ATTR_SESSION_ID, /* u32 */ 104 L2TP_ATTR_PEER_SESSION_ID, /* u32 */ 105 L2TP_ATTR_UDP_CSUM, /* u8 */ 106 L2TP_ATTR_VLAN_ID, /* u16 (not used) */ 107 L2TP_ATTR_COOKIE, /* 0, 4 or 8 bytes */ 108 L2TP_ATTR_PEER_COOKIE, /* 0, 4 or 8 bytes */ 109 L2TP_ATTR_DEBUG, /* u32, enum l2tp_debug_flags (not used) */ 110 L2TP_ATTR_RECV_SEQ, /* u8 */ 111 L2TP_ATTR_SEND_SEQ, /* u8 */ 112 L2TP_ATTR_LNS_MODE, /* u8 */ 113 L2TP_ATTR_USING_IPSEC, /* u8 */ 114 L2TP_ATTR_RECV_TIMEOUT, /* msec */ 115 L2TP_ATTR_FD, /* int */ 116 L2TP_ATTR_IP_SADDR, /* u32 */ 117 L2TP_ATTR_IP_DADDR, /* u32 */ 118 L2TP_ATTR_UDP_SPORT, /* u16 */ 119 L2TP_ATTR_UDP_DPORT, /* u16 */ 120 L2TP_ATTR_MTU, /* u16 (not used) */ 121 L2TP_ATTR_MRU, /* u16 (not used) */ 122 L2TP_ATTR_STATS, /* nested */ 123 L2TP_ATTR_IP6_SADDR, /* struct in6_addr */ 124 L2TP_ATTR_IP6_DADDR, /* struct in6_addr */ 125 L2TP_ATTR_UDP_ZERO_CSUM6_TX, /* flag */ 126 L2TP_ATTR_UDP_ZERO_CSUM6_RX, /* flag */ 127 L2TP_ATTR_PAD, 128 __L2TP_ATTR_MAX, 129}; 130 131#define L2TP_ATTR_MAX (__L2TP_ATTR_MAX - 1) 132 133/* Nested in L2TP_ATTR_STATS */ 134enum { 135 L2TP_ATTR_STATS_NONE, /* no data */ 136 L2TP_ATTR_TX_PACKETS, /* u64 */ 137 L2TP_ATTR_TX_BYTES, /* u64 */ 138 L2TP_ATTR_TX_ERRORS, /* u64 */ 139 L2TP_ATTR_RX_PACKETS, /* u64 */ 140 L2TP_ATTR_RX_BYTES, /* u64 */ 141 L2TP_ATTR_RX_SEQ_DISCARDS, /* u64 */ 142 L2TP_ATTR_RX_OOS_PACKETS, /* u64 */ 143 L2TP_ATTR_RX_ERRORS, /* u64 */ 144 L2TP_ATTR_STATS_PAD, 145 L2TP_ATTR_RX_COOKIE_DISCARDS, /* u64 */ 146 L2TP_ATTR_RX_INVALID, /* u64 */ 147 __L2TP_ATTR_STATS_MAX, 148}; 149 150#define L2TP_ATTR_STATS_MAX (__L2TP_ATTR_STATS_MAX - 1) 151 152enum l2tp_pwtype { 153 L2TP_PWTYPE_NONE = 0x0000, 154 L2TP_PWTYPE_ETH_VLAN = 0x0004, 155 L2TP_PWTYPE_ETH = 0x0005, 156 L2TP_PWTYPE_PPP = 0x0007, 157 L2TP_PWTYPE_PPP_AC = 0x0008, 158 L2TP_PWTYPE_IP = 0x000b, 159 __L2TP_PWTYPE_MAX 160}; 161 162enum l2tp_l2spec_type { 163 L2TP_L2SPECTYPE_NONE, 164 L2TP_L2SPECTYPE_DEFAULT, 165}; 166 167enum l2tp_encap_type { 168 L2TP_ENCAPTYPE_UDP, 169 L2TP_ENCAPTYPE_IP, 170}; 171 172/* For L2TP_ATTR_DATA_SEQ. Unused. */ 173enum l2tp_seqmode { 174 L2TP_SEQ_NONE = 0, 175 L2TP_SEQ_IP = 1, 176 L2TP_SEQ_ALL = 2, 177}; 178 179/** 180 * enum l2tp_debug_flags - debug message categories for L2TP tunnels/sessions. 181 * 182 * Unused. 183 * 184 * @L2TP_MSG_DEBUG: verbose debug (if compiled in) 185 * @L2TP_MSG_CONTROL: userspace - kernel interface 186 * @L2TP_MSG_SEQ: sequence numbers 187 * @L2TP_MSG_DATA: data packets 188 */ 189enum l2tp_debug_flags { 190 L2TP_MSG_DEBUG = (1 << 0), 191 L2TP_MSG_CONTROL = (1 << 1), 192 L2TP_MSG_SEQ = (1 << 2), 193 L2TP_MSG_DATA = (1 << 3), 194}; 195 196/* 197 * NETLINK_GENERIC related info 198 */ 199#define L2TP_GENL_NAME "l2tp" 200#define L2TP_GENL_VERSION 0x1 201#define L2TP_GENL_MCGROUP "l2tp" 202 203#endif /* _UAPI_LINUX_L2TP_H_ */ 204