#ifndef WRAPPER_H #define WRAPPER_H #include #include #include #include #include #include #include #include #include #include #include #include /* ip6_hdr */ /* Default snap length (maximum bytes per packet to capture) */ #define SNAP_LEN BUFSIZ /* Ethernet headers are always exactly 14 bytes */ #define SIZE_ETHERNET 14 /* IPv6 headers are always exactly 40 bytes */ #define SIZE_IP6 40 /* MAC address structure */ struct s_mac_addr { unsigned char a; unsigned char b; unsigned char c; unsigned char d; unsigned char e; unsigned char f; }; /* Ethernet header structure */ struct s_ethernet { struct s_mac_addr dest; /* 48 b; destination host (MAC) address */ struct s_mac_addr src; /* 48 b; source host (MAC) address */ unsigned short type; /* 16 b; IP/ARP/RARP/... */ }; /* IPv4 header structure */ struct s_ip4 { unsigned char ver_ihl; unsigned char tos; /* 8 b; type of service */ unsigned short pckt_len; /* 16 b; total lenght of the packet (IP header + payload) */ unsigned short id; /* 16 b; id of the packet - for purpose of fragmentation */ unsigned short flags_offset; /* 16 b; 3 b - flags, 13 b - fragment offset in bytes */ unsigned char ttl; /* 8 b; time to live */ unsigned char proto; /* 8 b; protocol in the payload */ unsigned short checksum; /* 16 b */ struct in_addr ip_src; /* 32 b; source address */ struct in_addr ip_dest; /* 32 b; destination address */ }; /* IPv6 header structure */ struct s_ip6 { unsigned char ver; /* 8 b; version */ unsigned char traffic_class; /* 8 b; traffic class */ unsigned short flow_label; /* 16 b; flow label (qos) */ unsigned short len; /* 16 b; payload length */ unsigned char next_header; /* 8 b; next header */ unsigned char hop_limit; /* 8 b; hop limit (replaces ttl) */ struct in6_addr ip_src; /* 128 b; source address */ struct in6_addr ip_dest; /* 128 b; destination address */ }; /* pseudo IPv6 header for checksum */ struct s_ip6_pseudo { struct in6_addr ip_src; /* 128 b; source address */ struct in6_addr ip_dest; /* 128 b; destination address */ unsigned int len; /* 32 b; payload length */ unsigned int zeros:24; /* 24 b; reserved */ unsigned char next_header; /* 8 b; next header */ }; /* TCP structure - only needed fields! */ struct s_tcp { unsigned short port_src; /* 16 b; source port */ unsigned short port_dest; /* 16 b; destination port */ long double data1; /* 96 b; first data segment */ unsigned short checksum; /* 16 b */ unsigned short data2; /* 16 b; the rest (urgent pointer here) */ }; /* UDP structure */ struct s_udp { unsigned short port_src; /* 16 b; source port */ unsigned short port_dest; /* 16 b; destination port */ unsigned short len; /* 16 b; header & data length */ unsigned short checksum; /* 16 b */ }; /* ICMP header structure */ struct s_icmp { unsigned char type; /* 8 b; ICMP type */ unsigned char code; /* 8 b; further specification of ICMP type */ unsigned short checksum; /* 16 b */ }; /* ICMP - ping structure */ struct s_icmp_ping { unsigned short id; /* 16 b; ID value for ECHO REPLY */ unsigned short seq; /* 16 b; sequence value for ECHO REPLY */ }; /* ICMPv6 - NDP option structure */ struct s_icmp_ndp_option { unsigned char type; /* 8 b; type of the option */ unsigned char len; /* 8 b; length of the option (including this header!) */ }; /* ICMPv6 - NDP NS structure */ struct s_icmp_ndp_ns { unsigned int zeros; /* 32 b; reserved section */ struct in6_addr target; /* 128 b; target IP address */ }; /* ICMPv6 - NDP NA structure */ struct s_icmp_ndp_na { unsigned char flags; /* 8 b; 3 flags */ unsigned int zeros:24; /* 24 b; reserved section */ struct in6_addr target; /* 128 b; target IP address */ unsigned char o_type; /* 8 b; option - type */ unsigned char o_len; /* 8 b; option - length */ struct s_mac_addr o_tlla; /* 48 b; option - target link-layer address */ }; /* INNAF = ICMPv6 NDP NA Flag */ #define INNAF_R 0x80 /* router flag */ #define INNAF_S 0x40 /* solicited flag */ #define INNAF_O 0x20 /* override flag */ /* Missing ethertypes */ #define ETHERTYPE_IPV6 0x86dd /* ICMP types */ #define ICMP4_ECHO_REQUEST 0x8 #define ICMP4_ECHO_REPLY 0x0 /* ICMPv6 types */ #define ICMP6_ECHO_REQUEST 0x80 #define ICMP6_ECHO_REPLY 0x81 #define ICMP6_NDP_RS 0x85 #define ICMP6_NDP_RA 0x86 #define ICMP6_NDP_NS 0x87 #define ICMP6_NDP_NA 0x88 #define ICMP6_NDP_RM 0x89 /* Prototypes */ int get_mac_addr(const char *dev, struct s_mac_addr *addr); int get_ip_addr(const char *dev, struct in_addr *addr); int get_dev_index(const char *dev); void process_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet); void process_packet4(const struct s_ethernet *eth, const unsigned char *packet); void process_udp4(const struct s_ethernet *eth_hdr, struct s_ip4 *ip_hdr, const unsigned char *payload, unsigned short data_size); void process_icmp4(const struct s_ethernet *eth_hdr, struct s_ip4 *ip_hdr, const unsigned char *payload, unsigned short data_size); void process_packet6(const struct s_ethernet *eth, const unsigned char *packet); void process_udp6(const struct s_ethernet *eth, struct s_ip6 *ip, const unsigned char *payload); void process_icmp6(const struct s_ethernet *eth, struct s_ip6 *ip, const unsigned char *payload); void process_ndp(const struct s_ethernet *eth_hdr, struct s_ip6 *ip_hdr, unsigned char *icmp_data); void send_there(struct in_addr ip4_addr, unsigned char ttl, unsigned int type, unsigned char *payload, unsigned int paylen); void send_ipv6(unsigned char *packet, int packet_size); unsigned short checksum(const void *_buf, int len); unsigned short checksum_ipv6(struct in6_addr ip_src, struct in6_addr ip_dest, unsigned short paylen, unsigned char proto, unsigned char *data); /* Variables */ extern struct s_mac_addr *mac; /* MAC address of the device */ extern char *dev; /* capture device name */ extern int dev_index; /* capture device index */ extern struct in_addr *dev_ip; /* IP address associated with the device */ extern struct in6_addr ip6addr_wrapsix; /* IPv6 prefix of WrapSix addresses */ #endif