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/** @file
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef __INET_IPV6_H__
#define __INET_IPV6_H__
#include <inttypes.h>
#include <stdbool.h>
#define IPv6_ADDR_SIZE 16
#define IPv6_HDR_SIZE 40
#define IPv6_FRAGMENT_HDR_SIZE 8
typedef struct e_in6_addr {
uint8_t bytes[16]; /* 128 bit IPv6 address */
} ws_in6_addr;
/*
* Definition for internet protocol version 6.
* RFC 2460
*/
struct ws_ip6_hdr {
uint32_t ip6h_vc_flow; /* version, class, flow */
uint16_t ip6h_plen; /* payload length */
uint8_t ip6h_nxt; /* next header */
uint8_t ip6h_hlim; /* hop limit */
ws_in6_addr ip6h_src; /* source address */
ws_in6_addr ip6h_dst; /* destination address */
};
/*
* Extension Headers
*/
struct ip6_ext {
unsigned char ip6e_nxt;
unsigned char ip6e_len;
};
/* Routing header */
struct ip6_rthdr {
uint8_t ip6r_nxt; /* next header */
uint8_t ip6r_len; /* length in units of 8 octets */
uint8_t ip6r_type; /* routing type */
uint8_t ip6r_segleft; /* segments left */
/* followed by routing type specific data */
};
/* Type 0 Routing header */
struct ip6_rthdr0 {
uint8_t ip6r0_nxt; /* next header */
uint8_t ip6r0_len; /* length in units of 8 octets */
uint8_t ip6r0_type; /* always zero */
uint8_t ip6r0_segleft; /* segments left */
uint8_t ip6r0_reserved; /* reserved field */
uint8_t ip6r0_slmap[3]; /* strict/loose bit map */
/* followed by up to 127 addresses */
ws_in6_addr ip6r0_addr[1];
};
/* Fragment header */
struct ip6_frag {
uint8_t ip6f_nxt; /* next header */
uint8_t ip6f_reserved; /* reserved field */
uint16_t ip6f_offlg; /* offset, reserved, and flag */
uint32_t ip6f_ident; /* identification */
};
#define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
#define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
#define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
/**
* Unicast Scope
* Note that we must check topmost 10 bits only, not 16 bits (see RFC2373).
*/
static inline bool in6_addr_is_linklocal(const ws_in6_addr *a)
{
return (a->bytes[0] == 0xfe) && ((a->bytes[1] & 0xc0) == 0x80);
}
static inline bool in6_addr_is_sitelocal(const ws_in6_addr *a)
{
return (a->bytes[0] == 0xfe) && ((a->bytes[1] & 0xc0) == 0xc0);
}
/**
* Multicast
*/
static inline bool in6_addr_is_multicast(const ws_in6_addr *a)
{
return a->bytes[0] == 0xff;
}
#endif
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