/** * (C) 2007-20 - ntop.org and contributors * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not see see * */ #if !defined( N2N_WIRE_H_ ) #define N2N_WIRE_H_ #include #ifndef _MSC_VER /* Not included in Visual Studio 2008 */ #include #endif #define N2N_PKT_VERSION 2 #define N2N_DEFAULT_TTL 2 /* can be forwarded twice at most */ #define N2N_COMMUNITY_SIZE 16 #define N2N_MAC_SIZE 6 #define N2N_COOKIE_SIZE 4 #define N2N_PKT_BUF_SIZE 2048 #define N2N_SOCKBUF_SIZE 64 /* string representation of INET or INET6 sockets */ #define N2N_MULTICAST_PORT 1968 #define N2N_MULTICAST_GROUP "224.0.0.68" typedef uint8_t n2n_community_t[N2N_COMMUNITY_SIZE]; typedef uint8_t n2n_mac_t[N2N_MAC_SIZE]; typedef uint8_t n2n_cookie_t[N2N_COOKIE_SIZE]; typedef char n2n_sock_str_t[N2N_SOCKBUF_SIZE]; /* tracing string buffer */ #if defined(WIN32) #include "win32/n2n_win32.h" #else /* #if defined(WIN32) */ #include #include /* AF_INET and AF_INET6 */ #endif /* #if defined(WIN32) */ typedef enum n2n_pc { n2n_ping=0, /* Not used */ n2n_register=1, /* Register edge to edge */ n2n_deregister=2, /* Deregister this edge */ n2n_packet=3, /* PACKET data content */ n2n_register_ack=4, /* ACK of a registration from edge to edge */ n2n_register_super=5, /* Register edge to supernode */ n2n_register_super_ack=6, /* ACK from supernode to edge */ n2n_register_super_nak=7, /* NAK from supernode to edge - registration refused */ n2n_federation=8, /* Not used by edge */ n2n_peer_info=9, /* Send info on a peer from sn to edge */ n2n_query_peer=10 /* ask supernode for info on a peer */ } n2n_pc_t; #define N2N_FLAGS_OPTIONS 0x0080 #define N2N_FLAGS_SOCKET 0x0040 #define N2N_FLAGS_FROM_SUPERNODE 0x0020 /* The bits in flag that are the packet type */ #define N2N_FLAGS_TYPE_MASK 0x001f /* 0 - 31 */ #define N2N_FLAGS_BITS_MASK 0xffe0 #define IPV4_SIZE 4 #define IPV6_SIZE 16 #define N2N_AUTH_TOKEN_SIZE 32 /* bytes */ #define N2N_EUNKNOWN -1 #define N2N_ENOTIMPL -2 #define N2N_EINVAL -3 #define N2N_ENOSPACE -4 typedef struct n2n_ip_subnet { uint32_t net_addr; /* Host order IP address. */ uint8_t net_bitlen; /* Subnet prefix. */ } n2n_ip_subnet_t; typedef struct n2n_sock { uint8_t family; /* AF_INET or AF_INET6; or 0 if invalid */ uint16_t port; /* host order */ union { uint8_t v6[IPV6_SIZE]; /* byte sequence */ uint8_t v4[IPV4_SIZE]; /* byte sequence */ } addr; } n2n_sock_t; typedef struct n2n_auth { uint16_t scheme; /* What kind of auth */ uint16_t toksize; /* Size of auth token */ uint8_t token[N2N_AUTH_TOKEN_SIZE]; /* Auth data interpreted based on scheme */ } n2n_auth_t; typedef struct n2n_common { /* NOTE: wire representation is different! */ /* int version; */ uint8_t ttl; uint8_t pc; uint16_t flags; n2n_community_t community; } n2n_common_t; typedef struct n2n_REGISTER { n2n_cookie_t cookie; /**< Link REGISTER and REGISTER_ACK */ n2n_mac_t srcMac; /**< MAC of registering party */ n2n_mac_t dstMac; /**< MAC of target edge */ n2n_sock_t sock; /**< REVISIT: unused? */ } n2n_REGISTER_t; typedef struct n2n_REGISTER_ACK { n2n_cookie_t cookie; /**< Return cookie from REGISTER */ n2n_mac_t srcMac; /**< MAC of acknowledging party (supernode or edge) */ n2n_mac_t dstMac; /**< Reflected MAC of registering edge from REGISTER */ n2n_sock_t sock; /**< Supernode's view of edge socket (IP Addr, port) */ } n2n_REGISTER_ACK_t; typedef struct n2n_PACKET { n2n_mac_t srcMac; n2n_mac_t dstMac; n2n_sock_t sock; uint8_t transform; uint8_t compression; } n2n_PACKET_t; /* Linked with n2n_register_super in n2n_pc_t. Only from edge to supernode. */ typedef struct n2n_REGISTER_SUPER { n2n_cookie_t cookie; /**< Link REGISTER_SUPER and REGISTER_SUPER_ACK */ n2n_mac_t edgeMac; /**< MAC to register with edge sending socket */ n2n_ip_subnet_t dev_addr; /**< IP address of the tuntap adapter. */ n2n_auth_t auth; /**< Authentication scheme and tokens */ } n2n_REGISTER_SUPER_t; /* Linked with n2n_register_super_ack in n2n_pc_t. Only from supernode to edge. */ typedef struct n2n_REGISTER_SUPER_ACK { n2n_cookie_t cookie; /**< Return cookie from REGISTER_SUPER */ n2n_mac_t edgeMac; /**< MAC registered to edge sending socket */ n2n_ip_subnet_t dev_addr; /**< Assign an IP address to the tuntap adapter of edge. */ uint16_t lifetime; /**< How long the registration will live */ n2n_sock_t sock; /**< Sending sockets associated with edgeMac */ /** The packet format provides additional supernode definitions here. * uint8_t count, then for each count there is one * n2n_sock_t. */ uint8_t num_sn; /**< Number of supernodes that were send * even if we cannot store them all. If * non-zero then sn_bak is valid. */ n2n_sock_t sn_bak; /**< Socket of the first backup supernode */ } n2n_REGISTER_SUPER_ACK_t; /* Linked with n2n_register_super_ack in n2n_pc_t. Only from supernode to edge. */ typedef struct n2n_REGISTER_SUPER_NAK { n2n_cookie_t cookie; /* Return cookie from REGISTER_SUPER */ } n2n_REGISTER_SUPER_NAK_t; typedef struct n2n_PEER_INFO { uint16_t aflags; n2n_mac_t mac; n2n_sock_t sock; } n2n_PEER_INFO_t; typedef struct n2n_QUERY_PEER { n2n_mac_t srcMac; n2n_mac_t targetMac; } n2n_QUERY_PEER_t; typedef struct n2n_buf n2n_buf_t; int encode_uint8( uint8_t * base, size_t * idx, const uint8_t v ); int decode_uint8( uint8_t * out, const uint8_t * base, size_t * rem, size_t * idx ); int encode_uint16( uint8_t * base, size_t * idx, const uint16_t v ); int decode_uint16( uint16_t * out, const uint8_t * base, size_t * rem, size_t * idx ); int encode_uint32( uint8_t * base, size_t * idx, const uint32_t v ); int decode_uint32( uint32_t * out, const uint8_t * base, size_t * rem, size_t * idx ); int encode_buf( uint8_t * base, size_t * idx, const void * p, size_t s); int decode_buf( uint8_t * out, size_t bufsize, const uint8_t * base, size_t * rem, size_t * idx ); int encode_mac( uint8_t * base, size_t * idx, const n2n_mac_t m ); int decode_mac( uint8_t * out, /* of size N2N_MAC_SIZE. This clearer than passing a n2n_mac_t */ const uint8_t * base, size_t * rem, size_t * idx ); int encode_common( uint8_t * base, size_t * idx, const n2n_common_t * common ); int decode_common( n2n_common_t * out, const uint8_t * base, size_t * rem, size_t * idx ); int encode_sock( uint8_t * base, size_t * idx, const n2n_sock_t * sock ); int decode_sock( n2n_sock_t * sock, const uint8_t * base, size_t * rem, size_t * idx ); int encode_REGISTER( uint8_t * base, size_t * idx, const n2n_common_t * common, const n2n_REGISTER_t * reg ); int decode_REGISTER( n2n_REGISTER_t * pkt, const n2n_common_t * cmn, /* info on how to interpret it */ const uint8_t * base, size_t * rem, size_t * idx ); int encode_REGISTER_SUPER( uint8_t * base, size_t * idx, const n2n_common_t * common, const n2n_REGISTER_SUPER_t * reg ); int decode_REGISTER_SUPER( n2n_REGISTER_SUPER_t * pkt, const n2n_common_t * cmn, /* info on how to interpret it */ const uint8_t * base, size_t * rem, size_t * idx ); int encode_REGISTER_ACK( uint8_t * base, size_t * idx, const n2n_common_t * common, const n2n_REGISTER_ACK_t * reg ); int decode_REGISTER_ACK( n2n_REGISTER_ACK_t * pkt, const n2n_common_t * cmn, /* info on how to interpret it */ const uint8_t * base, size_t * rem, size_t * idx ); int encode_REGISTER_SUPER_ACK( uint8_t * base, size_t * idx, const n2n_common_t * cmn, const n2n_REGISTER_SUPER_ACK_t * reg ); int decode_REGISTER_SUPER_ACK( n2n_REGISTER_SUPER_ACK_t * reg, const n2n_common_t * cmn, /* info on how to interpret it */ const uint8_t * base, size_t * rem, size_t * idx ); int fill_sockaddr( struct sockaddr * addr, size_t addrlen, const n2n_sock_t * sock ); int encode_PACKET( uint8_t * base, size_t * idx, const n2n_common_t * common, const n2n_PACKET_t * pkt ); int decode_PACKET( n2n_PACKET_t * pkt, const n2n_common_t * cmn, /* info on how to interpret it */ const uint8_t * base, size_t * rem, size_t * idx ); int encode_PEER_INFO( uint8_t * base, size_t * idx, const n2n_common_t * common, const n2n_PEER_INFO_t * pkt ); int decode_PEER_INFO( n2n_PEER_INFO_t * pkt, const n2n_common_t * cmn, /* info on how to interpret it */ const uint8_t * base, size_t * rem, size_t * idx ); int encode_QUERY_PEER( uint8_t * base, size_t * idx, const n2n_common_t * common, const n2n_QUERY_PEER_t * pkt ); int decode_QUERY_PEER( n2n_QUERY_PEER_t * pkt, const n2n_common_t * cmn, /* info on how to interpret it */ const uint8_t * base, size_t * rem, size_t * idx ); #endif /* #if !defined( N2N_WIRE_H_ ) */