/* Copyright (C) 2007-2010 Open Information Security Foundation * * You can copy, redistribute or modify this Program under the terms of * the GNU General Public License version 2 as published by the Free * Software Foundation. * * 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 * version 2 along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ /** * \file * * \author Victor Julien */ #ifndef __DECODE_ICMPV6_H__ #define __DECODE_ICMPV6_H__ #include "decode-tcp.h" #include "decode-sctp.h" #include "decode-udp.h" #include "decode-ipv6.h" #define ICMPV6_HEADER_LEN 8 #define ICMPV6_HEADER_PKT_OFFSET 8 /** ICMPV6 Message Types: */ /** Error Messages: (type <128) */ #define ICMP6_DST_UNREACH 1 #define ICMP6_PACKET_TOO_BIG 2 #define ICMP6_TIME_EXCEEDED 3 #define ICMP6_PARAM_PROB 4 /** Informational Messages (type>=128) */ #define ICMP6_ECHO_REQUEST 128 #define ICMP6_ECHO_REPLY 129 #define MLD_LISTENER_QUERY 130 #define MLD_LISTENER_REPORT 131 #define MLD_LISTENER_REDUCTION 132 #define ND_ROUTER_SOLICIT 133 #define ND_ROUTER_ADVERT 134 #define ND_NEIGHBOR_SOLICIT 135 #define ND_NEIGHBOR_ADVERT 136 #define ND_REDIRECT 137 /** Destination Unreachable Message (type=1) Code: */ #define ICMP6_DST_UNREACH_NOROUTE 0 /* no route to destination */ #define ICMP6_DST_UNREACH_ADMIN 1 /* communication with destination */ /* administratively prohibited */ #define ICMP6_DST_UNREACH_BEYONDSCOPE 2 /* beyond scope of source address */ #define ICMP6_DST_UNREACH_ADDR 3 /* address unreachable */ #define ICMP6_DST_UNREACH_NOPORT 4 /* bad port */ #define ICMP6_DST_UNREACH_FAILEDPOLICY 5 /* Source address failed ingress/egress policy */ #define ICMP6_DST_UNREACH_REJECTROUTE 6 /* Reject route to destination */ /** Time Exceeded Message (type=3) Code: */ #define ICMP6_TIME_EXCEED_TRANSIT 0 /* Hop Limit == 0 in transit */ #define ICMP6_TIME_EXCEED_REASSEMBLY 1 /* Reassembly time out */ /** Parameter Problem Message (type=4) Code: */ #define ICMP6_PARAMPROB_HEADER 0 /* erroneous header field */ #define ICMP6_PARAMPROB_NEXTHEADER 1 /* unrecognized Next Header */ #define ICMP6_PARAMPROB_OPTION 2 /* unrecognized IPv6 option */ /** macro for icmpv6 "type" access */ #define ICMPV6_GET_TYPE(p) (p)->icmpv6h->type /** macro for icmpv6 "code" access */ #define ICMPV6_GET_CODE(p) (p)->icmpv6h->code /** macro for icmpv6 "csum" access */ #define ICMPV6_GET_CSUM(p) (p)->icmpv6h->csum /** If message is informational */ /** macro for icmpv6 "id" access */ #define ICMPV6_GET_ID(p) (p)->icmpv6vars.id /** macro for icmpv6 "seq" access */ #define ICMPV6_GET_SEQ(p) (p)->icmpv6vars.seq /** If message is Error */ /** macro for icmpv6 "unused" access */ #define ICMPV6_GET_UNUSED(p) (p)->icmpv6h->icmpv6b.icmpv6e.unused /** macro for icmpv6 "error_ptr" access */ #define ICMPV6_GET_ERROR_PTR(p) (p)->icmpv6h->icmpv6b.icmpv6e.error_ptr /** macro for icmpv6 "mtu" access */ #define ICMPV6_GET_MTU(p) (p)->icmpv6h->icmpv6b.icmpv6e.mtu /** macro for icmpv6 embedded "protocol" access */ #define ICMPV6_GET_EMB_PROTO(p) (p)->icmpv6vars.emb_ip6_proto_next /** macro for icmpv6 embedded "ipv6h" header access */ #define ICMPV6_GET_EMB_IPV6(p) (p)->icmpv6vars.emb_ipv6h /** macro for icmpv6 embedded "tcph" header access */ #define ICMPV6_GET_EMB_TCP(p) (p)->icmpv6vars.emb_tcph /** macro for icmpv6 embedded "udph" header access */ #define ICMPV6_GET_EMB_UDP(p) (p)->icmpv6vars.emb_udph /** macro for icmpv6 embedded "icmpv6h" header access */ #define ICMPV6_GET_EMB_icmpv6h(p) (p)->icmpv6vars.emb_icmpv6h typedef struct ICMPV6Info_ { uint16_t id; uint16_t seq; } ICMPV6Info; /** ICMPv6 header structure */ typedef struct ICMPV6Hdr_ { uint8_t type; uint8_t code; uint16_t csum; union { ICMPV6Info icmpv6i; /** Informational message */ union { uint32_t unused; /** for types 1 and 3, should be zero */ uint32_t error_ptr; /** for type 4, pointer to the octet that originate the error */ uint32_t mtu; /** for type 2, the Maximum Transmission Unit of the next-hop link */ } icmpv6e; /** Error Message */ } icmpv6b; } ICMPV6Hdr; /** Data available from the decoded packet */ typedef struct ICMPV6Vars_ { /* checksum of the icmpv6 packet */ uint16_t id; uint16_t seq; uint32_t mtu; uint32_t error_ptr; /** Pointers to the embedded packet headers */ IPV6Hdr *emb_ipv6h; TCPHdr *emb_tcph; UDPHdr *emb_udph; ICMPV6Hdr *emb_icmpv6h; /** IPv6 src and dst address */ uint32_t emb_ip6_src[4]; uint32_t emb_ip6_dst[4]; uint8_t emb_ip6_proto_next; /** TCP/UDP ports */ uint16_t emb_sport; uint16_t emb_dport; } ICMPV6Vars; #define CLEAR_ICMPV6_PACKET(p) do { \ (p)->level4_comp_csum = -1; \ (p)->icmpv6vars.id = 0; \ (p)->icmpv6vars.seq = 0; \ (p)->icmpv6vars.mtu = 0; \ (p)->icmpv6vars.error_ptr = 0; \ (p)->icmpv6vars.emb_ipv6h = NULL; \ (p)->icmpv6vars.emb_tcph = NULL; \ (p)->icmpv6vars.emb_udph = NULL; \ (p)->icmpv6vars.emb_icmpv6h = NULL; \ (p)->icmpv6vars.emb_ip6_src[0] = 0; \ (p)->icmpv6vars.emb_ip6_src[1] = 0; \ (p)->icmpv6vars.emb_ip6_src[2] = 0; \ (p)->icmpv6vars.emb_ip6_src[3] = 0; \ (p)->icmpv6vars.emb_ip6_proto_next = 0; \ (p)->icmpv6vars.emb_sport = 0; \ (p)->icmpv6vars.emb_dport = 0; \ (p)->icmpv6h = NULL; \ } while(0) void DecodeICMPV6RegisterTests(void); /** -------- Inline functions --------- */ static inline uint16_t ICMPV6CalculateChecksum(uint16_t *, uint16_t *, uint16_t); /** * \brief Calculates the checksum for the ICMPV6 packet * * \param shdr Pointer to source address field from the IPV6 packet. Used as a * part of the psuedoheader for computing the checksum * \param pkt Pointer to the start of the ICMPV6 packet * \param tlen Total length of the ICMPV6 packet(header + payload) * * \retval csum Checksum for the ICMPV6 packet */ static inline uint16_t ICMPV6CalculateChecksum(uint16_t *shdr, uint16_t *pkt, uint16_t tlen) { uint16_t pad = 0; uint32_t csum = shdr[0]; csum += shdr[1] + shdr[2] + shdr[3] + shdr[4] + shdr[5] + shdr[6] + shdr[7] + shdr[8] + shdr[9] + shdr[10] + shdr[11] + shdr[12] + shdr[13] + shdr[14] + shdr[15] + htons(58 + tlen); csum += pkt[0]; tlen -= 4; pkt += 2; while (tlen >= 64) { csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] + pkt[7] + pkt[8] + pkt[9] + pkt[10] + pkt[11] + pkt[12] + pkt[13] + pkt[14] + pkt[15] + pkt[16] + pkt[17] + pkt[18] + pkt[19] + pkt[20] + pkt[21] + pkt[22] + pkt[23] + pkt[24] + pkt[25] + pkt[26] + pkt[27] + pkt[28] + pkt[29] + pkt[30] + pkt[31]; tlen -= 64; pkt += 32; } while (tlen >= 32) { csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] + pkt[7] + pkt[8] + pkt[9] + pkt[10] + pkt[11] + pkt[12] + pkt[13] + pkt[14] + pkt[15]; tlen -= 32; pkt += 16; } while(tlen >= 8) { csum += pkt[0] + pkt[1] + pkt[2] + pkt[3]; tlen -= 8; pkt += 4; } while(tlen >= 4) { csum += pkt[0] + pkt[1]; tlen -= 4; pkt += 2; } while (tlen > 1) { csum += pkt[0]; tlen -= 2; pkt += 1; } if (tlen == 1) { *(uint8_t *)(&pad) = (*(uint8_t *)pkt); csum += pad; } csum = (csum >> 16) + (csum & 0x0000FFFF); csum += (csum >> 16); return (uint16_t) ~csum; } #endif /* __DECODE_ICMPV6_H__ */