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