/* $FreeBSD: src/sys/netinet/ip6.h,v 1.22 2013/04/10 00:26:22 svnexp Exp $ */ /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun 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. * 4. 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 /* * 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 */ #ifndef _KERNEL #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */ #endif #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_EID 0x8a /* 10 0 01010 */ #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, deprecated by RFC 5095. */ 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 */ /* followed by up to 127 struct in6_addr */ } __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*/ #define IPV6_MAXOPTHDR 2048 /* max option header size, 256 64-bit words */ #ifdef _KERNEL /* * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the * target header (including IPv6 itself, extension headers and * TCP/UDP/ICMP6 headers) are contiguous. KAME requires drivers * to store incoming data into one internal mbuf or one or more external * mbufs(never into two or more internal mbufs). Thus, the third case is * supposed to never be matched but is prepared just in case. */ #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \ do { \ if ((m)->m_next != NULL) { \ if (((m)->m_flags & M_LOOP) && \ ((m)->m_len < (off) + (hlen)) && \ (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \ IP6STAT_INC(ip6s_exthdrtoolong); \ return ret; \ } else if ((m)->m_flags & M_EXT) { \ if ((m)->m_len < (off) + (hlen)) { \ IP6STAT_INC(ip6s_exthdrtoolong); \ m_freem(m); \ return ret; \ } \ } else { \ if ((m)->m_len < (off) + (hlen)) { \ IP6STAT_INC(ip6s_exthdrtoolong); \ m_freem(m); \ return ret; \ } \ } \ } else { \ if ((m)->m_len < (off) + (hlen)) { \ IP6STAT_INC(ip6s_tooshort); \ in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \ m_freem(m); \ return ret; \ } \ } \ } while (/*CONSTCOND*/ 0) /* * 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". * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the * very top of mbuf. GET0 is likely to make memory copy than GET. * * XXX we're now testing this, needs m_pulldown() */ #define IP6_EXTHDR_GET(val, typ, m, off, len) \ do { \ struct mbuf *t; \ int tmp; \ if ((m)->m_len >= (off) + (len)) \ (val) = (typ)(mtod((m), caddr_t) + (off)); \ else { \ t = m_pulldown((m), (off), (len), &tmp); \ if (t) { \ if (t->m_len < tmp + (len)) \ panic("m_pulldown malfunction"); \ (val) = (typ)(mtod(t, caddr_t) + tmp); \ } else { \ (val) = (typ)NULL; \ (m) = NULL; \ } \ } \ } while (/*CONSTCOND*/ 0) #define IP6_EXTHDR_GET0(val, typ, m, off, len) \ do { \ struct mbuf *t; \ if ((off) == 0) \ (val) = (typ)mtod(m, caddr_t); \ else { \ t = m_pulldown((m), (off), (len), NULL); \ if (t) { \ if (t->m_len < (len)) \ panic("m_pulldown malfunction"); \ (val) = (typ)mtod(t, caddr_t); \ } else { \ (val) = (typ)NULL; \ (m) = NULL; \ } \ } \ } while (/*CONSTCOND*/ 0) #endif /*_KERNEL*/ #endif /* not _NETINET_IP6_H_ */