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/* 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 <victor@inliniac.net>
*/
#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__ */
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