| /* $FreeBSD$ */ |
| /* $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 _BSD_NETINET_IP6_H_ |
| #define _BSD_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 _FREEBSD_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 _FREEBSD_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 continuous. 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)) { \ |
| V_ip6stat.ip6s_exthdrtoolong++; \ |
| return ret; \ |
| } else if ((m)->m_flags & M_EXT) { \ |
| if ((m)->m_len < (off) + (hlen)) { \ |
| V_ip6stat.ip6s_exthdrtoolong++; \ |
| m_freem(m); \ |
| return ret; \ |
| } \ |
| } else { \ |
| if ((m)->m_len < (off) + (hlen)) { \ |
| V_ip6stat.ip6s_exthdrtoolong++; \ |
| m_freem(m); \ |
| return ret; \ |
| } \ |
| } \ |
| } else { \ |
| if ((m)->m_len < (off) + (hlen)) { \ |
| V_ip6stat.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 /*_FREEBSD_KERNEL*/ |
| |
| #endif /* not _BSD_NETINET_IP6_H_ */ |
