| /* Copyright (C) 1991-1997, 2001, 2003, 2006 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #ifndef _NETINET_IP6_H |
| #define _NETINET_IP6_H 1 |
| |
| #include <inttypes.h> |
| #include <netinet/in.h> |
| |
| struct ip6_hdr |
| { |
| union |
| { |
| struct ip6_hdrctl |
| { |
| uint32_t ip6_un1_flow; /* 4 bits version, 8 bits TC, |
| 20 bits 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 tclass */ |
| } ip6_ctlun; |
| struct in6_addr ip6_src; /* source address */ |
| struct in6_addr ip6_dst; /* destination address */ |
| }; |
| |
| #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 |
| #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim |
| #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim |
| |
| /* Generic extension header. */ |
| struct ip6_ext |
| { |
| uint8_t ip6e_nxt; /* next header. */ |
| uint8_t ip6e_len; /* length in units of 8 octets. */ |
| }; |
| |
| /* Hop-by-Hop options header. */ |
| struct ip6_hbh |
| { |
| uint8_t ip6h_nxt; /* next header. */ |
| uint8_t ip6h_len; /* length in units of 8 octets. */ |
| /* followed by options */ |
| }; |
| |
| /* Destination options header */ |
| struct ip6_dest |
| { |
| uint8_t ip6d_nxt; /* next header */ |
| uint8_t ip6d_len; /* length in units of 8 octets */ |
| /* followed by options */ |
| }; |
| |
| /* 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 struct in6_addr */ |
| struct in6_addr ip6r0_addr[0]; |
| }; |
| |
| /* 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 */ |
| }; |
| |
| #if BYTE_ORDER == BIG_ENDIAN |
| # 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 */ |
| #else /* BYTE_ORDER == LITTLE_ENDIAN */ |
| # define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */ |
| # define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */ |
| # define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */ |
| #endif |
| |
| /* IPv6 options */ |
| struct ip6_opt |
| { |
| uint8_t ip6o_type; |
| uint8_t ip6o_len; |
| }; |
| |
| /* The high-order 3 bits of the option type define the behavior |
| * when processing an unknown option and whether or not the option |
| * content changes in flight. |
| */ |
| #define IP6OPT_TYPE(o) ((o) & 0xc0) |
| #define IP6OPT_TYPE_SKIP 0x00 |
| #define IP6OPT_TYPE_DISCARD 0x40 |
| #define IP6OPT_TYPE_FORCEICMP 0x80 |
| #define IP6OPT_TYPE_ICMP 0xc0 |
| #define IP6OPT_TYPE_MUTABLE 0x20 |
| |
| /* Special option types for padding. */ |
| #define IP6OPT_PAD1 0 |
| #define IP6OPT_PADN 1 |
| |
| #define IP6OPT_JUMBO 0xc2 |
| #define IP6OPT_NSAP_ADDR 0xc3 |
| #define IP6OPT_TUNNEL_LIMIT 0x04 |
| #define IP6OPT_ROUTER_ALERT 0x05 |
| |
| /* Jumbo Payload Option */ |
| struct ip6_opt_jumbo |
| { |
| uint8_t ip6oj_type; |
| uint8_t ip6oj_len; |
| uint8_t ip6oj_jumbo_len[4]; |
| }; |
| #define IP6OPT_JUMBO_LEN 6 |
| |
| /* NSAP Address Option */ |
| struct ip6_opt_nsap |
| { |
| uint8_t ip6on_type; |
| uint8_t ip6on_len; |
| uint8_t ip6on_src_nsap_len; |
| uint8_t ip6on_dst_nsap_len; |
| /* followed by source NSAP */ |
| /* followed by destination NSAP */ |
| }; |
| |
| /* Tunnel Limit Option */ |
| struct ip6_opt_tunnel |
| { |
| uint8_t ip6ot_type; |
| uint8_t ip6ot_len; |
| uint8_t ip6ot_encap_limit; |
| }; |
| |
| /* Router Alert Option */ |
| struct ip6_opt_router |
| { |
| uint8_t ip6or_type; |
| uint8_t ip6or_len; |
| uint8_t ip6or_value[2]; |
| }; |
| |
| /* Router alert values (in network byte order) */ |
| #if BYTE_ORDER == BIG_ENDIAN |
| # define IP6_ALERT_MLD 0x0000 |
| # define IP6_ALERT_RSVP 0x0001 |
| # define IP6_ALERT_AN 0x0002 |
| #else /* BYTE_ORDER == LITTLE_ENDING */ |
| # define IP6_ALERT_MLD 0x0000 |
| # define IP6_ALERT_RSVP 0x0100 |
| # define IP6_ALERT_AN 0x0200 |
| #endif |
| |
| #endif /* netinet/ip6.h */ |