/* $OpenBSD: ip6.h,v 1.23 2025/05/27 07:52:49 bluhm Exp $ */ /* $KAME: ip6.h,v 1.45 2003/06/05 04:46:38 keiichi Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip.h 8.1 (Berkeley) 6/10/93 */ #ifndef _NETINET_IP6_H_ #define _NETINET_IP6_H_ /* * Definition for internet protocol version 6. * RFC 2460 */ struct ip6_hdr { union { struct ip6_hdrctl { u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */ u_int16_t ip6_un1_plen; /* payload length */ u_int8_t ip6_un1_nxt; /* next header */ u_int8_t ip6_un1_hlim; /* hop limit */ } ip6_un1; u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */ } ip6_ctlun; struct in6_addr ip6_src; /* source address */ struct in6_addr ip6_dst; /* destination address */ } __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 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim #define IPV6_VERSION 0x60 #define IPV6_VERSION_MASK 0xf0 #if _BYTE_ORDER == _BIG_ENDIAN #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */ #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */ #else #if _BYTE_ORDER == _LITTLE_ENDIAN #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */ #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */ #endif /* _LITTLE_ENDIAN */ #endif #if 1 /* ECN bits proposed by Sally Floyd */ #define IP6TOS_CE 0x01 /* congestion experienced */ #define IP6TOS_ECT 0x02 /* ECN-capable transport */ #endif #ifdef _KERNEL /* * for IPv6 pseudo header checksum * XXX nonstandard */ struct ip6_hdr_pseudo { struct in6_addr ip6ph_src; struct in6_addr ip6ph_dst; u_int32_t ip6ph_len; u_int8_t ip6ph_zero[3]; u_int8_t ip6ph_nxt; } __packed; #endif /* * Extension Headers */ struct ip6_ext { u_int8_t ip6e_nxt; u_int8_t ip6e_len; } __packed; /* Hop-by-Hop options header */ /* XXX should we pad it to force alignment on an 8-byte boundary? */ struct ip6_hbh { u_int8_t ip6h_nxt; /* next header */ u_int8_t ip6h_len; /* length in units of 8 octets */ /* followed by options */ } __packed; /* Destination options header */ /* XXX should we pad it to force alignment on an 8-byte boundary? */ struct ip6_dest { u_int8_t ip6d_nxt; /* next header */ u_int8_t ip6d_len; /* length in units of 8 octets */ /* followed by options */ } __packed; /* Option types and related macros */ #define IP6OPT_PAD1 0x00 /* 00 0 00000 */ #define IP6OPT_PADN 0x01 /* 00 0 00001 */ #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */ #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */ #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */ #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */ #define IP6OPT_RTALERT_LEN 4 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */ #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */ #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */ #define IP6OPT_MINLEN 2 #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_MUTABLE 0x20 /* IPv6 options: common part */ struct ip6_opt { u_int8_t ip6o_type; u_int8_t ip6o_len; } __packed; /* Jumbo Payload Option */ struct ip6_opt_jumbo { u_int8_t ip6oj_type; u_int8_t ip6oj_len; u_int8_t ip6oj_jumbo_len[4]; } __packed; #define IP6OPT_JUMBO_LEN 6 /* NSAP Address Option */ struct ip6_opt_nsap { u_int8_t ip6on_type; u_int8_t ip6on_len; u_int8_t ip6on_src_nsap_len; u_int8_t ip6on_dst_nsap_len; /* followed by source NSAP */ /* followed by destination NSAP */ } __packed; /* Tunnel Limit Option */ struct ip6_opt_tunnel { u_int8_t ip6ot_type; u_int8_t ip6ot_len; u_int8_t ip6ot_encap_limit; } __packed; /* Router Alert Option */ struct ip6_opt_router { u_int8_t ip6or_type; u_int8_t ip6or_len; u_int8_t ip6or_value[2]; } __packed; /* 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 #if _BYTE_ORDER == _LITTLE_ENDIAN #define IP6_ALERT_MLD 0x0000 #define IP6_ALERT_RSVP 0x0100 #define IP6_ALERT_AN 0x0200 #endif /* _LITTLE_ENDIAN */ #endif /* Routing header */ struct ip6_rthdr { u_int8_t ip6r_nxt; /* next header */ u_int8_t ip6r_len; /* length in units of 8 octets */ u_int8_t ip6r_type; /* routing type */ u_int8_t ip6r_segleft; /* segments left */ /* followed by routing type specific data */ } __packed; /* Type 0 Routing header */ struct ip6_rthdr0 { u_int8_t ip6r0_nxt; /* next header */ u_int8_t ip6r0_len; /* length in units of 8 octets */ u_int8_t ip6r0_type; /* always zero */ u_int8_t ip6r0_segleft; /* segments left */ u_int32_t ip6r0_reserved; /* reserved field */ } __packed; /* Fragment header */ struct ip6_frag { u_int8_t ip6f_nxt; /* next header */ u_int8_t ip6f_reserved; /* reserved field */ u_int16_t ip6f_offlg; /* offset, reserved, and flag */ u_int32_t ip6f_ident; /* identification */ } __packed; #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 /* _BYTE_ORDER == _LITTLE_ENDIAN */ /* * Internet implementation parameters. */ #define IPV6_MAXHLIM 255 /* maximum hoplimit */ #define IPV6_DEFHLIM 64 /* default hlim */ #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */ #define IPV6_HLIMDEC 1 /* subtracted when forwarding */ #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */ #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/ #ifdef _KERNEL /* * ip6_exthdr_get() ensures that intermediate protocol header (from "off" * to "len") is located in single mbuf, on contiguous memory region. * The pointer to the region will be returned to pointer variable "val", * with type "typ". */ static inline void * ip6_exthdr_get(struct mbuf **mp, int off, int len) { struct mbuf *t; int toff; if ((*mp)->m_len >= off + len) return (mtod(*mp, caddr_t) + off); t = m_pulldown(*mp, off, len, &toff); if (t == NULL) { *mp = NULL; return (NULL); } return (mtod(t, caddr_t) + toff); } #endif /* _KERNEL */ #endif /* _NETINET_IP6_H_ */
