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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 sockets18 * @l2tp_family: address family number AF_L2TPIP.19 * @l2tp_addr: protocol specific address information20 * @l2tp_conn_id: connection id of tunnel21 */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 sockets40 * @l2tp_family: address family number AF_L2TPIP.41 * @l2tp_addr: protocol specific address information42 * @l2tp_conn_id: connection id of tunnel43 */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, udpcsum62 * TUNNEL_DELETE - CONN_ID63 * TUNNEL_MODIFY - CONN_ID, udpcsum64 * TUNNEL_GETSTATS - CONN_ID, (stats)65 * TUNNEL_GET - CONN_ID, (...)66 * SESSION_CREATE - SESSION_ID, PW_TYPE, cookie, peer_cookie, l2spec67 * SESSION_DELETE - SESSION_ID68 * SESSION_MODIFY - SESSION_ID69 * 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 L2TP90 */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_MAX160};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 interface186 * @L2TP_MSG_SEQ: sequence numbers187 * @L2TP_MSG_DATA: data packets188 */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 info198 */199#define L2TP_GENL_NAME "l2tp"200#define L2TP_GENL_VERSION 0x1201#define L2TP_GENL_MCGROUP "l2tp"202 203#endif /* _UAPI_LINUX_L2TP_H_ */204