184 lines
5.7 KiB
C
184 lines
5.7 KiB
C
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/*
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* ip6.h
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*
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* Internet Protocol, Version 6 (RFC 2460).
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*
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* Copyright (c) 2002 Dug Song <dugsong@monkey.org>
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*
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* $Id: ip6.h,v 1.6 2004/02/23 10:01:15 dugsong Exp $
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*/
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#ifndef DNET_IP6_H
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#define DNET_IP6_H
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#define IP6_ADDR_LEN 16
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#define IP6_ADDR_BITS 128
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#define IP6_HDR_LEN 40 /* IPv6 header length */
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#define IP6_LEN_MIN IP6_HDR_LEN
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#define IP6_LEN_MAX 65535 /* non-jumbo payload */
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#define IP6_MTU_MIN 1280 /* minimum MTU (1024 + 256) */
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typedef struct ip6_addr {
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uint8_t data[IP6_ADDR_LEN];
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} ip6_addr_t;
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#ifndef __GNUC__
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# define __attribute__(x)
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# pragma pack(1)
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#endif
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/*
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* IPv6 header
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*/
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struct ip6_hdr {
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union {
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struct ip6_hdr_ctl {
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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_ctlun;
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ip6_addr_t ip6_src;
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ip6_addr_t ip6_dst;
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} __attribute__((__packed__));
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#define ip6_vfc ip6_ctlun.ip6_un2_vfc
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#define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
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#define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
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#define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt /* IP_PROTO_* */
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#define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
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#define IP6_VERSION 0x60
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#define IP6_VERSION_MASK 0xf0 /* ip6_vfc version */
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#if DNET_BYTESEX == DNET_BIG_ENDIAN
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#define IP6_FLOWINFO_MASK 0x0fffffff /* ip6_flow info (28 bits) */
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#define IP6_FLOWLABEL_MASK 0x000fffff /* ip6_flow label (20 bits) */
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#elif DNET_BYTESEX == DNET_LIL_ENDIAN
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#define IP6_FLOWINFO_MASK 0xffffff0f /* ip6_flow info (28 bits) */
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#define IP6_FLOWLABEL_MASK 0xffff0f00 /* ip6_flow label (20 bits) */
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#endif
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/*
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* Hop limit (ip6_hlim)
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*/
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#define IP6_HLIM_DEFAULT 64
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#define IP6_HLIM_MAX 255
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/*
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* Preferred extension header order from RFC 2460, 4.1:
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*
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* IP_PROTO_IPV6, IP_PROTO_HOPOPTS, IP_PROTO_DSTOPTS, IP_PROTO_ROUTING,
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* IP_PROTO_FRAGMENT, IP_PROTO_AH, IP_PROTO_ESP, IP_PROTO_DSTOPTS, IP_PROTO_*
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*/
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/*
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* Routing header data (IP_PROTO_ROUTING)
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*/
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struct ip6_ext_data_routing {
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uint8_t type; /* routing type */
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uint8_t segleft; /* segments left */
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/* followed by routing type specific data */
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} __attribute__((__packed__));
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struct ip6_ext_data_routing0 {
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uint8_t type; /* always zero */
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uint8_t segleft; /* segments left */
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uint8_t reserved; /* reserved field */
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uint8_t slmap[3]; /* strict/loose bit map */
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ip6_addr_t addr[1]; /* up to 23 addresses */
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} __attribute__((__packed__));
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/*
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* Fragment header data (IP_PROTO_FRAGMENT)
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*/
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struct ip6_ext_data_fragment {
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uint16_t offlg; /* offset, reserved, and flag */
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uint32_t ident; /* identification */
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} __attribute__((__packed__));
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/*
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* Fragmentation offset, reserved, and flags (offlg)
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*/
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#if DNET_BYTESEX == DNET_BIG_ENDIAN
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#define IP6_OFF_MASK 0xfff8 /* mask out offset from offlg */
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#define IP6_RESERVED_MASK 0x0006 /* reserved bits in offlg */
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#define IP6_MORE_FRAG 0x0001 /* more-fragments flag */
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#elif DNET_BYTESEX == DNET_LIL_ENDIAN
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#define IP6_OFF_MASK 0xf8ff /* mask out offset from offlg */
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#define IP6_RESERVED_MASK 0x0600 /* reserved bits in offlg */
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#define IP6_MORE_FRAG 0x0100 /* more-fragments flag */
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#endif
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/*
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* Option types, for IP_PROTO_HOPOPTS, IP_PROTO_DSTOPTS headers
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*/
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#define IP6_OPT_PAD1 0x00 /* 00 0 00000 */
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#define IP6_OPT_PADN 0x01 /* 00 0 00001 */
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#define IP6_OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
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#define IP6_OPT_JUMBO_LEN 6
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#define IP6_OPT_RTALERT 0x05 /* 00 0 00101 */
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#define IP6_OPT_RTALERT_LEN 4
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#define IP6_OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
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#define IP6_OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
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#define IP6_OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
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#define IP6_OPT_LEN_MIN 2
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#define IP6_OPT_TYPE(o) ((o) & 0xC0) /* high 2 bits of opt_type */
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#define IP6_OPT_TYPE_SKIP 0x00 /* continue processing on failure */
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#define IP6_OPT_TYPE_DISCARD 0x40 /* discard packet on failure */
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#define IP6_OPT_TYPE_FORCEICMP 0x80 /* discard and send ICMP on failure */
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#define IP6_OPT_TYPE_ICMP 0xC0 /* ...only if non-multicast dst */
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#define IP6_OPT_MUTABLE 0x20 /* option data may change en route */
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/*
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* Extension header (chained via {ip6,ext}_nxt, following IPv6 header)
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*/
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struct ip6_ext_hdr {
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uint8_t ext_nxt; /* next header */
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uint8_t ext_len; /* following length in units of 8 octets */
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union {
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struct ip6_ext_data_routing routing;
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struct ip6_ext_data_fragment fragment;
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} ext_data;
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} __attribute__((__packed__));
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#ifndef __GNUC__
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# pragma pack()
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#endif
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/*
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* Reserved addresses
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*/
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#define IP6_ADDR_UNSPEC \
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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#define IP6_ADDR_LOOPBACK \
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"
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#define ip6_pack_hdr(hdr, fc, fl, plen, nxt, hlim, src, dst) do { \
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struct ip6_hdr *ip6 = (struct ip6_hdr *)(hdr); \
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ip6->ip6_flow = htonl(((uint32_t)(fc) << 28) & \
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(IP6_FLOWLABEL_MASK | (fl))); \
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ip6->ip6_vfc = (IP6_VERSION | ((fc) >> 4)); \
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ip6->ip6_plen = htons((plen)); \
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ip6->ip6_nxt = (nxt); ip6->ip6_hlim = (hlim); \
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memmove(&ip6->ip6_src, &(src), IP6_ADDR_LEN); \
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memmove(&ip6->ip6_dst, &(dst), IP6_ADDR_LEN); \
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} while (0);
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__BEGIN_DECLS
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char *ip6_ntop(const ip6_addr_t *ip6, char *dst, size_t size);
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int ip6_pton(const char *src, ip6_addr_t *dst);
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char *ip6_ntoa(const ip6_addr_t *ip6);
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#define ip6_aton ip6_pton
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void ip6_checksum(void *buf, size_t len);
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__END_DECLS
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#endif /* DNET_IP6_H */
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