bb4a7d94b9
Introduce convenience macros to retrieve the DSCP, ECN or traffic class
bits from an IPv6 header.
Use them where appropriate.
Reviewed by: ae (previous version), rscheff, tuexen, rgrimes
MFC after: 2 weeks
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D29056
265 lines
9.1 KiB
C
265 lines
9.1 KiB
C
/* $FreeBSD$ */
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/* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ip.h 8.1 (Berkeley) 6/10/93
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*/
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#ifndef _NETINET_IP6_H_
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#define _NETINET_IP6_H_
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/*
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* Definition for internet protocol version 6.
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* RFC 2460
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*/
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struct ip6_hdr {
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union {
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struct ip6_hdrctl {
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u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
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u_int16_t ip6_un1_plen; /* payload length */
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u_int8_t ip6_un1_nxt; /* next header */
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u_int8_t ip6_un1_hlim; /* hop limit */
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} ip6_un1;
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u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
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} ip6_ctlun;
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struct in6_addr ip6_src; /* source address */
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struct in6_addr ip6_dst; /* destination address */
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} __packed;
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#define ip6_vfc ip6_ctlun.ip6_un2_vfc
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#define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
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#define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
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#define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
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#define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
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#define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
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#define IPV6_VERSION 0x60
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#define IPV6_VERSION_MASK 0xf0
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#if BYTE_ORDER == BIG_ENDIAN
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#define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
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#define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
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#else
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
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#define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
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#endif /* LITTLE_ENDIAN */
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#endif
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#define IPV6_FLOWLABEL_LEN 20
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#define IPV6_TRAFFIC_CLASS(ip6) ((ntohl((ip6)->ip6_flow) >> 20) & 0xff)
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#define IPV6_DSCP(ip6) ((ntohl((ip6)->ip6_flow) >> 20) & 0xfc)
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#define IPV6_ECN(ip6) ((ntohl((ip6)->ip6_flow) >> 20) & 0x03)
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/*
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* Extension Headers
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*/
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struct ip6_ext {
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u_int8_t ip6e_nxt;
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u_int8_t ip6e_len;
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} __packed;
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/* Hop-by-Hop options header */
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/* XXX should we pad it to force alignment on an 8-byte boundary? */
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struct ip6_hbh {
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u_int8_t ip6h_nxt; /* next header */
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u_int8_t ip6h_len; /* length in units of 8 octets */
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/* followed by options */
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} __packed;
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/* Destination options header */
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/* XXX should we pad it to force alignment on an 8-byte boundary? */
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struct ip6_dest {
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u_int8_t ip6d_nxt; /* next header */
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u_int8_t ip6d_len; /* length in units of 8 octets */
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/* followed by options */
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} __packed;
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/* Option types and related macros */
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#define IP6OPT_PAD1 0x00 /* 00 0 00000 */
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#define IP6OPT_PADN 0x01 /* 00 0 00001 */
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#define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
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#define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
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#define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
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#ifndef _KERNEL
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#define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
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#endif
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#define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */
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#define IP6OPT_RTALERT_LEN 4
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#define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
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#define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
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#define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
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#define IP6OPT_MINLEN 2
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#define IP6OPT_EID 0x8a /* 10 0 01010 */
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#define IP6OPT_TYPE(o) ((o) & 0xC0)
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#define IP6OPT_TYPE_SKIP 0x00
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#define IP6OPT_TYPE_DISCARD 0x40
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#define IP6OPT_TYPE_FORCEICMP 0x80
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#define IP6OPT_TYPE_ICMP 0xC0
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#define IP6OPT_MUTABLE 0x20
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/* IPv6 options: common part */
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struct ip6_opt {
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u_int8_t ip6o_type;
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u_int8_t ip6o_len;
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} __packed;
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/* Jumbo Payload Option */
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struct ip6_opt_jumbo {
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u_int8_t ip6oj_type;
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u_int8_t ip6oj_len;
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u_int8_t ip6oj_jumbo_len[4];
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} __packed;
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#define IP6OPT_JUMBO_LEN 6
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/* NSAP Address Option */
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struct ip6_opt_nsap {
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u_int8_t ip6on_type;
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u_int8_t ip6on_len;
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u_int8_t ip6on_src_nsap_len;
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u_int8_t ip6on_dst_nsap_len;
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/* followed by source NSAP */
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/* followed by destination NSAP */
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} __packed;
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/* Tunnel Limit Option */
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struct ip6_opt_tunnel {
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u_int8_t ip6ot_type;
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u_int8_t ip6ot_len;
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u_int8_t ip6ot_encap_limit;
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} __packed;
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/* Router Alert Option */
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struct ip6_opt_router {
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u_int8_t ip6or_type;
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u_int8_t ip6or_len;
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u_int8_t ip6or_value[2];
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} __packed;
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/* Router alert values (in network byte order) */
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#if BYTE_ORDER == BIG_ENDIAN
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#define IP6_ALERT_MLD 0x0000
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#define IP6_ALERT_RSVP 0x0001
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#define IP6_ALERT_AN 0x0002
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#else
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define IP6_ALERT_MLD 0x0000
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#define IP6_ALERT_RSVP 0x0100
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#define IP6_ALERT_AN 0x0200
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#endif /* LITTLE_ENDIAN */
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#endif
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/* Routing header */
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struct ip6_rthdr {
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u_int8_t ip6r_nxt; /* next header */
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u_int8_t ip6r_len; /* length in units of 8 octets */
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u_int8_t ip6r_type; /* routing type */
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u_int8_t ip6r_segleft; /* segments left */
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/* followed by routing type specific data */
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} __packed;
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/* Type 0 Routing header, deprecated by RFC 5095. */
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struct ip6_rthdr0 {
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u_int8_t ip6r0_nxt; /* next header */
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u_int8_t ip6r0_len; /* length in units of 8 octets */
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u_int8_t ip6r0_type; /* always zero */
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u_int8_t ip6r0_segleft; /* segments left */
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u_int32_t ip6r0_reserved; /* reserved field */
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/* followed by up to 127 struct in6_addr */
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} __packed;
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/* Fragment header */
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struct ip6_frag {
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u_int8_t ip6f_nxt; /* next header */
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u_int8_t ip6f_reserved; /* reserved field */
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u_int16_t ip6f_offlg; /* offset, reserved, and flag */
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u_int32_t ip6f_ident; /* identification */
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} __packed;
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#if BYTE_ORDER == BIG_ENDIAN
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#define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
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#define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
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#define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
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#else /* BYTE_ORDER == LITTLE_ENDIAN */
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#define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
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#define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
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#define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
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#endif /* BYTE_ORDER == LITTLE_ENDIAN */
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/*
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* Internet implementation parameters.
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*/
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#define IPV6_MAXHLIM 255 /* maximum hoplimit */
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#define IPV6_DEFHLIM 64 /* default hlim */
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#define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
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#define IPV6_HLIMDEC 1 /* subtracted when forwarding */
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#define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
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#define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
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#define IPV6_MAXOPTHDR 2048 /* max option header size, 256 64-bit words */
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#endif /* not _NETINET_IP6_H_ */
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