include/uapi/linux/l2tp.h

   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 _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
  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, cookie, peer_cookie, l2spec
  69  * SESSION_DELETE       - SESSION_ID
  70  * SESSION_MODIFY       - SESSION_ID
  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 (not used) */
  98         L2TP_ATTR_DATA_SEQ,             /* u16 (not used) */
  99         L2TP_ATTR_L2SPEC_TYPE,          /* u8, enum l2tp_l2spec_type */
 100         L2TP_ATTR_L2SPEC_LEN,           /* u8 (not used) */
 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 (not used) */
 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 (not used) */
 123         L2TP_ATTR_MRU,                  /* u16 (not used) */
 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 /* For L2TP_ATTR_DATA_SEQ. Unused. */
 173 enum 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  * @L2TP_MSG_DEBUG: verbose debug (if compiled in)
 183  * @L2TP_MSG_CONTROL: userspace - kernel interface
 184  * @L2TP_MSG_SEQ: sequence numbers
 185  * @L2TP_MSG_DATA: data packets
 186  */
 187 enum l2tp_debug_flags {
 188         L2TP_MSG_DEBUG          = (1 << 0),
 189         L2TP_MSG_CONTROL        = (1 << 1),
 190         L2TP_MSG_SEQ            = (1 << 2),
 191         L2TP_MSG_DATA           = (1 << 3),
 192 };
 193
 194 /*
 195  * NETLINK_GENERIC related info
 196  */
 197 #define L2TP_GENL_NAME          "l2tp"
 198 #define L2TP_GENL_VERSION       0x1
 199 #define L2TP_GENL_MCGROUP       "l2tp"
 200
 201 #endif /* _LINUX_L2TP_H_ */