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244 lines
8.2 KiB
C
244 lines
8.2 KiB
C
/* Copyright (C) 2007-2013 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_IPV6_H__
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#define __DECODE_IPV6_H__
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#define IPV6_HEADER_LEN 40
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#define IPV6_MAXPACKET 65535 /* maximum packet size */
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#define IPV6_MAX_OPT 40
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typedef struct IPV6Hdr_
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{
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union {
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struct ip6_un1_ {
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uint32_t ip6_un1_flow; /* 20 bits of flow-ID */
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uint16_t ip6_un1_plen; /* payload length */
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uint8_t ip6_un1_nxt; /* next header */
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uint8_t ip6_un1_hlim; /* hop limit */
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} ip6_un1;
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uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
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} ip6_hdrun;
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union {
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struct {
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uint32_t ip6_src[4];
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uint32_t ip6_dst[4];
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} ip6_un2;
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uint16_t ip6_addrs[16];
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} ip6_hdrun2;
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} __attribute__((__packed__)) IPV6Hdr;
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#define s_ip6_src ip6_hdrun2.ip6_un2.ip6_src
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#define s_ip6_dst ip6_hdrun2.ip6_un2.ip6_dst
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#define s_ip6_addrs ip6_hdrun2.ip6_addrs
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#define s_ip6_vfc ip6_hdrun.ip6_un2_vfc
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#define s_ip6_flow ip6_hdrun.ip6_un1.ip6_un1_flow
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#define s_ip6_plen ip6_hdrun.ip6_un1.ip6_un1_plen
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#define s_ip6_nxt ip6_hdrun.ip6_un1.ip6_un1_nxt
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#define s_ip6_hlim ip6_hdrun.ip6_un1.ip6_un1_hlim
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#define IPV6_GET_RAW_VER(ip6h) (((ip6h)->s_ip6_vfc & 0xf0) >> 4)
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#define IPV6_GET_RAW_CLASS(ip6h) ((ntohl((ip6h)->s_ip6_flow) & 0x0FF00000) >> 20)
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#define IPV6_GET_RAW_FLOW(ip6h) (ntohl((ip6h)->s_ip6_flow) & 0x000FFFFF)
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#define IPV6_GET_RAW_NH(ip6h) ((ip6h)->s_ip6_nxt)
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#define IPV6_GET_RAW_PLEN(ip6h) (ntohs((ip6h)->s_ip6_plen))
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#define IPV6_GET_RAW_HLIM(ip6h) ((ip6h)->s_ip6_hlim)
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#define IPV6_SET_RAW_VER(ip6h, value) ((ip6h)->s_ip6_vfc = (((ip6h)->s_ip6_vfc & 0x0f) | (value << 4)))
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#define IPV6_SET_RAW_NH(ip6h, value) ((ip6h)->s_ip6_nxt = (value))
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#define IPV6_SET_L4PROTO(p,proto) (p)->ip6vars.l4proto = proto
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/* ONLY call these functions after making sure that:
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* 1. p->ip6h is set
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* 2. p->ip6h is valid (len is correct)
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*/
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#define IPV6_GET_VER(p) \
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IPV6_GET_RAW_VER((p)->ip6h)
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#define IPV6_GET_CLASS(p) \
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IPV6_GET_RAW_CLASS((p)->ip6h)
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#define IPV6_GET_FLOW(p) \
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IPV6_GET_RAW_FLOW((p)->ip6h)
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#define IPV6_GET_NH(p) \
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(IPV6_GET_RAW_NH((p)->ip6h))
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#define IPV6_GET_PLEN(p) \
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IPV6_GET_RAW_PLEN((p)->ip6h)
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#define IPV6_GET_HLIM(p) \
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(IPV6_GET_RAW_HLIM((p)->ip6h))
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/* XXX */
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#define IPV6_GET_L4PROTO(p) \
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((p)->ip6vars.l4proto)
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/** \brief get the highest proto/next header field we know */
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//#define IPV6_GET_UPPER_PROTO(p) (p)->ip6eh.ip6_exthdrs_cnt ?
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// (p)->ip6eh.ip6_exthdrs[(p)->ip6eh.ip6_exthdrs_cnt - 1].next : IPV6_GET_NH((p))
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/* helper structure with parsed ipv6 info */
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typedef struct IPV6Vars_
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{
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uint8_t ip_opts_len;
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uint8_t l4proto; /* the proto after the extension headers
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* store while decoding so we don't have
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* to loop through the exthdrs all the time */
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} IPV6Vars;
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#define CLEAR_IPV6_PACKET(p) do { \
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(p)->ip6h = NULL; \
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(p)->ip6vars.ip_opts_len = 0; \
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(p)->ip6vars.l4proto = 0; \
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memset(&(p)->ip6eh, 0x00, sizeof((p)->ip6eh)); \
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} while (0)
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/* Fragment header */
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typedef struct IPV6FragHdr_
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{
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uint8_t ip6fh_nxt; /* next header */
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uint8_t ip6fh_reserved; /* reserved field */
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uint16_t ip6fh_offlg; /* offset, reserved, and flag */
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uint32_t ip6fh_ident; /* identification */
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} __attribute__((__packed__)) IPV6FragHdr;
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#define IPV6_EXTHDR_GET_FH_NH(p) (p)->ip6eh.fh_nh
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#define IPV6_EXTHDR_GET_FH_OFFSET(p) (p)->ip6eh.fh_offset
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#define IPV6_EXTHDR_GET_FH_FLAG(p) (p)->ip6eh.fh_more_frags_set
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#define IPV6_EXTHDR_GET_FH_ID(p) (p)->ip6eh.fh_id
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/* rfc 1826 */
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typedef struct IPV6AuthHdr_
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{
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uint8_t ip6ah_nxt; /* next header */
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uint8_t ip6ah_len; /* header length in units of 8 bytes, not
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including first 8 bytes. */
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uint16_t ip6ah_reserved; /* reserved for future use */
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uint32_t ip6ah_spi; /* SECURITY PARAMETERS INDEX (SPI) */
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uint32_t ip6ah_seq; /* sequence number */
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} __attribute__((__packed__)) IPV6AuthHdr;
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typedef struct IPV6EspHdr_
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{
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uint32_t ip6esph_spi; /* SECURITY PARAMETERS INDEX (SPI) */
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uint32_t ip6esph_seq; /* sequence number */
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} __attribute__((__packed__)) IPV6EspHdr;
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typedef struct IPV6RouteHdr_
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{
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uint8_t ip6rh_nxt; /* next header */
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uint8_t ip6rh_len; /* header length in units of 8 bytes, not
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including first 8 bytes. */
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uint8_t ip6rh_type; /* routing type */
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uint8_t ip6rh_segsleft; /* segments left */
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} __attribute__((__packed__)) IPV6RouteHdr;
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/* Hop-by-Hop header and Destination Options header use options that are
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* defined here. */
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#define IPV6OPT_PAD1 0x00
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#define IPV6OPT_PADN 0x01
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#define IPV6OPT_RA 0x05
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#define IPV6OPT_JUMBO 0xC2
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#define IPV6OPT_HAO 0xC9
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/* Home Address Option */
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typedef struct IPV6OptHAO_
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{
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uint8_t ip6hao_type; /* Option type */
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uint8_t ip6hao_len; /* Option Data len (excludes type and len) */
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struct in6_addr ip6hao_hoa; /* Home address. */
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} IPV6OptHAO;
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/* Router Alert Option */
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typedef struct IPV6OptRA_
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{
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uint8_t ip6ra_type; /* Option type */
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uint8_t ip6ra_len; /* Option Data len (excludes type and len) */
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uint16_t ip6ra_value; /* Router Alert value */
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} IPV6OptRA;
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/* Jumbo Option */
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typedef struct IPV6OptJumbo_
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{
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uint8_t ip6j_type; /* Option type */
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uint8_t ip6j_len; /* Option Data len (excludes type and len) */
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uint32_t ip6j_payload_len; /* Jumbo Payload Length */
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} IPV6OptJumbo;
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typedef struct IPV6HopOptsHdr_
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{
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uint8_t ip6hh_nxt; /* next header */
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uint8_t ip6hh_len; /* header length in units of 8 bytes, not
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including first 8 bytes. */
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} __attribute__((__packed__)) IPV6HopOptsHdr;
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typedef struct IPV6DstOptsHdr_
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{
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uint8_t ip6dh_nxt; /* next header */
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uint8_t ip6dh_len; /* header length in units of 8 bytes, not
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including first 8 bytes. */
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} __attribute__((__packed__)) IPV6DstOptsHdr;
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typedef struct IPV6GenOptHdr_
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{
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uint8_t type;
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uint8_t next;
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uint8_t len;
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uint8_t *data;
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} IPV6GenOptHdr;
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typedef struct IPV6ExtHdrs_
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{
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_Bool rh_set;
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uint8_t rh_type;
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_Bool fh_set;
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_Bool fh_more_frags_set;
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uint8_t fh_nh;
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uint8_t fh_prev_nh;
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uint16_t fh_prev_hdr_offset;
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uint16_t fh_header_offset;
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uint16_t fh_data_offset;
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uint16_t fh_data_len;
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/* In fh_offset we store the offset of this extension into the packet past
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* the ipv6 header. We use it in defrag for creating a defragmented packet
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* without the frag header */
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uint16_t fh_offset;
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uint32_t fh_id;
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} IPV6ExtHdrs;
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#define IPV6_EXTHDR_SET_FH(p) (p)->ip6eh.fh_set = TRUE
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#define IPV6_EXTHDR_ISSET_FH(p) (p)->ip6eh.fh_set
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#define IPV6_EXTHDR_SET_RH(p) (p)->ip6eh.rh_set = TRUE
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#define IPV6_EXTHDR_ISSET_RH(p) (p)->ip6eh.rh_set
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void DecodeIPV6RegisterTests(void);
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#endif /* __DECODE_IPV6_H__ */
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