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 (at) katalix.com> 6 */ 7 8 #ifndef _LINUX_L2TP_H_ 9 #define _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 #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[__SOCK_SIZE__ - 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, enum l2tp_debug_flags */ 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, /* flag */ 128 L2TP_ATTR_UDP_ZERO_CSUM6_RX, /* flag */ 129 L2TP_ATTR_PAD, 130 __L2TP_ATTR_MAX, 131 }; 132 133 #define L2TP_ATTR_MAX (__L2TP_ATTR_MAX - 1) 134 135 /* Nested in L2TP_ATTR_STATS */ 136 enum { 137 L2TP_ATTR_STATS_NONE, /* no data */ 138 L2TP_ATTR_TX_PACKETS, /* u64 */ 139 L2TP_ATTR_TX_BYTES, /* u64 */ 140 L2TP_ATTR_TX_ERRORS, /* u64 */ 141 L2TP_ATTR_RX_PACKETS, /* u64 */ 142 L2TP_ATTR_RX_BYTES, /* u64 */ 143 L2TP_ATTR_RX_SEQ_DISCARDS, /* u64 */ 144 L2TP_ATTR_RX_OOS_PACKETS, /* u64 */ 145 L2TP_ATTR_RX_ERRORS, /* u64 */ 146 L2TP_ATTR_STATS_PAD, 147 __L2TP_ATTR_STATS_MAX, 148 }; 149 150 #define L2TP_ATTR_STATS_MAX (__L2TP_ATTR_STATS_MAX - 1) 151 152 enum 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 }; 161 162 enum l2tp_l2spec_type { 163 L2TP_L2SPECTYPE_NONE, 164 L2TP_L2SPECTYPE_DEFAULT, 165 }; 166 167 enum l2tp_encap_type { 168 L2TP_ENCAPTYPE_UDP, 169 L2TP_ENCAPTYPE_IP, 170 }; 171 172 enum l2tp_seqmode { 173 L2TP_SEQ_NONE = 0, 174 L2TP_SEQ_IP = 1, 175 L2TP_SEQ_ALL = 2, 176 }; 177 178 /** 179 * enum l2tp_debug_flags - debug message categories for L2TP tunnels/sessions 180 * 181 * @L2TP_MSG_DEBUG: verbose debug (if compiled in) 182 * @L2TP_MSG_CONTROL: userspace - kernel interface 183 * @L2TP_MSG_SEQ: sequence numbers 184 * @L2TP_MSG_DATA: data packets 185 */ 186 enum l2tp_debug_flags { 187 L2TP_MSG_DEBUG = (1 << 0), 188 L2TP_MSG_CONTROL = (1 << 1), 189 L2TP_MSG_SEQ = (1 << 2), 190 L2TP_MSG_DATA = (1 << 3), 191 }; 192 193 /* 194 * NETLINK_GENERIC related info 195 */ 196 #define L2TP_GENL_NAME "l2tp" 197 #define L2TP_GENL_VERSION 0x1 198 #define L2TP_GENL_MCGROUP "l2tp" 199 200 #endif /* _LINUX_L2TP_H_ */ 201
