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246 lines
7.6 KiB
C
246 lines
7.6 KiB
C
/* Copyright (C) 2007-2010 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*/
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#ifndef __DECODE_ICMPV6_H__
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#define __DECODE_ICMPV6_H__
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#include "decode-tcp.h"
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#include "decode-sctp.h"
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#include "decode-udp.h"
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#include "decode-ipv6.h"
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#define ICMPV6_HEADER_LEN 8
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#define ICMPV6_HEADER_PKT_OFFSET 8
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/** ICMPV6 Message Types: */
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/** Error Messages: (type <128) */
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#define ICMP6_DST_UNREACH 1
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#define ICMP6_PACKET_TOO_BIG 2
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#define ICMP6_TIME_EXCEEDED 3
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#define ICMP6_PARAM_PROB 4
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/** Informational Messages (type>=128) */
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#define ICMP6_ECHO_REQUEST 128
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#define ICMP6_ECHO_REPLY 129
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#define MLD_LISTENER_QUERY 130
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#define MLD_LISTENER_REPORT 131
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#define MLD_LISTENER_REDUCTION 132
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#define ND_ROUTER_SOLICIT 133
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#define ND_ROUTER_ADVERT 134
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#define ND_NEIGHBOR_SOLICIT 135
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#define ND_NEIGHBOR_ADVERT 136
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#define ND_REDIRECT 137
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/** Destination Unreachable Message (type=1) Code: */
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#define ICMP6_DST_UNREACH_NOROUTE 0 /* no route to destination */
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#define ICMP6_DST_UNREACH_ADMIN 1 /* communication with destination */
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/* administratively prohibited */
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#define ICMP6_DST_UNREACH_BEYONDSCOPE 2 /* beyond scope of source address */
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#define ICMP6_DST_UNREACH_ADDR 3 /* address unreachable */
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#define ICMP6_DST_UNREACH_NOPORT 4 /* bad port */
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#define ICMP6_DST_UNREACH_FAILEDPOLICY 5 /* Source address failed ingress/egress policy */
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#define ICMP6_DST_UNREACH_REJECTROUTE 6 /* Reject route to destination */
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/** Time Exceeded Message (type=3) Code: */
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#define ICMP6_TIME_EXCEED_TRANSIT 0 /* Hop Limit == 0 in transit */
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#define ICMP6_TIME_EXCEED_REASSEMBLY 1 /* Reassembly time out */
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/** Parameter Problem Message (type=4) Code: */
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#define ICMP6_PARAMPROB_HEADER 0 /* erroneous header field */
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#define ICMP6_PARAMPROB_NEXTHEADER 1 /* unrecognized Next Header */
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#define ICMP6_PARAMPROB_OPTION 2 /* unrecognized IPv6 option */
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/** macro for icmpv6 "type" access */
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#define ICMPV6_GET_TYPE(p) (p)->icmpv6h->type
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/** macro for icmpv6 "code" access */
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#define ICMPV6_GET_CODE(p) (p)->icmpv6h->code
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/** macro for icmpv6 "csum" access */
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#define ICMPV6_GET_CSUM(p) (p)->icmpv6h->csum
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/** If message is informational */
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/** macro for icmpv6 "id" access */
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#define ICMPV6_GET_ID(p) (p)->icmpv6vars.id
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/** macro for icmpv6 "seq" access */
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#define ICMPV6_GET_SEQ(p) (p)->icmpv6vars.seq
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/** If message is Error */
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/** macro for icmpv6 "unused" access */
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#define ICMPV6_GET_UNUSED(p) (p)->icmpv6h->icmpv6b.icmpv6e.unused
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/** macro for icmpv6 "error_ptr" access */
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#define ICMPV6_GET_ERROR_PTR(p) (p)->icmpv6h->icmpv6b.icmpv6e.error_ptr
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/** macro for icmpv6 "mtu" access */
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#define ICMPV6_GET_MTU(p) (p)->icmpv6h->icmpv6b.icmpv6e.mtu
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/** macro for icmpv6 embedded "protocol" access */
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#define ICMPV6_GET_EMB_PROTO(p) (p)->icmpv6vars.emb_ip6_proto_next
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/** macro for icmpv6 embedded "ipv6h" header access */
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#define ICMPV6_GET_EMB_IPV6(p) (p)->icmpv6vars.emb_ipv6h
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/** macro for icmpv6 embedded "tcph" header access */
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#define ICMPV6_GET_EMB_TCP(p) (p)->icmpv6vars.emb_tcph
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/** macro for icmpv6 embedded "udph" header access */
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#define ICMPV6_GET_EMB_UDP(p) (p)->icmpv6vars.emb_udph
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/** macro for icmpv6 embedded "icmpv6h" header access */
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#define ICMPV6_GET_EMB_icmpv6h(p) (p)->icmpv6vars.emb_icmpv6h
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typedef struct ICMPV6Info_
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{
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uint16_t id;
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uint16_t seq;
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} ICMPV6Info;
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/** ICMPv6 header structure */
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typedef struct ICMPV6Hdr_
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{
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uint8_t type;
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uint8_t code;
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uint16_t csum;
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union {
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ICMPV6Info icmpv6i; /** Informational message */
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union
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{
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uint32_t unused; /** for types 1 and 3, should be zero */
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uint32_t error_ptr; /** for type 4, pointer to the octet that originate the error */
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uint32_t mtu; /** for type 2, the Maximum Transmission Unit of the next-hop link */
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} icmpv6e; /** Error Message */
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} icmpv6b;
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} ICMPV6Hdr;
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/** Data available from the decoded packet */
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typedef struct ICMPV6Vars_ {
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/* checksum of the icmpv6 packet */
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uint16_t id;
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uint16_t seq;
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uint32_t mtu;
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uint32_t error_ptr;
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/** Pointers to the embedded packet headers */
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IPV6Hdr *emb_ipv6h;
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TCPHdr *emb_tcph;
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UDPHdr *emb_udph;
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ICMPV6Hdr *emb_icmpv6h;
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/** IPv6 src and dst address */
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uint32_t emb_ip6_src[4];
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uint32_t emb_ip6_dst[4];
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uint8_t emb_ip6_proto_next;
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/** TCP/UDP ports */
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uint16_t emb_sport;
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uint16_t emb_dport;
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} ICMPV6Vars;
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#define CLEAR_ICMPV6_PACKET(p) do { \
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(p)->level4_comp_csum = -1; \
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PACKET_CLEAR_L4VARS((p)); \
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(p)->icmpv6h = NULL; \
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} while(0)
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void DecodeICMPV6RegisterTests(void);
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/** -------- Inline functions --------- */
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static inline uint16_t ICMPV6CalculateChecksum(uint16_t *, uint16_t *, uint16_t);
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/**
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* \brief Calculates the checksum for the ICMPV6 packet
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*
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* \param shdr Pointer to source address field from the IPV6 packet. Used as a
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* part of the psuedoheader for computing the checksum
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* \param pkt Pointer to the start of the ICMPV6 packet
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* \param tlen Total length of the ICMPV6 packet(header + payload)
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*
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* \retval csum Checksum for the ICMPV6 packet
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*/
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static inline uint16_t ICMPV6CalculateChecksum(uint16_t *shdr, uint16_t *pkt,
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uint16_t tlen)
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{
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uint16_t pad = 0;
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uint32_t csum = shdr[0];
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csum += shdr[1] + shdr[2] + shdr[3] + shdr[4] + shdr[5] + shdr[6] +
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shdr[7] + shdr[8] + shdr[9] + shdr[10] + shdr[11] + shdr[12] +
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shdr[13] + shdr[14] + shdr[15] + htons(58 + tlen);
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csum += pkt[0];
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tlen -= 4;
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pkt += 2;
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while (tlen >= 64) {
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csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] +
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pkt[7] + pkt[8] + pkt[9] + pkt[10] + pkt[11] + pkt[12] + pkt[13] +
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pkt[14] + pkt[15] + pkt[16] + pkt[17] + pkt[18] + pkt[19] +
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pkt[20] + pkt[21] + pkt[22] + pkt[23] + pkt[24] + pkt[25] +
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pkt[26] + pkt[27] + pkt[28] + pkt[29] + pkt[30] + pkt[31];
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tlen -= 64;
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pkt += 32;
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}
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while (tlen >= 32) {
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csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] +
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pkt[7] + pkt[8] + pkt[9] + pkt[10] + pkt[11] + pkt[12] + pkt[13] +
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pkt[14] + pkt[15];
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tlen -= 32;
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pkt += 16;
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}
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while(tlen >= 8) {
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csum += pkt[0] + pkt[1] + pkt[2] + pkt[3];
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tlen -= 8;
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pkt += 4;
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}
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while(tlen >= 4) {
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csum += pkt[0] + pkt[1];
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tlen -= 4;
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pkt += 2;
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}
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while (tlen > 1) {
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csum += pkt[0];
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tlen -= 2;
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pkt += 1;
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}
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if (tlen == 1) {
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*(uint8_t *)(&pad) = (*(uint8_t *)pkt);
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csum += pad;
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}
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csum = (csum >> 16) + (csum & 0x0000FFFF);
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csum += (csum >> 16);
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return (uint16_t) ~csum;
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}
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#endif /* __DECODE_ICMPV6_H__ */
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