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7755951df7
In 'struct ip6_hdr', 'struct ip6_rthdr0' and 'struct ip6_srh'.
This avoid some 'undefined-behavior' warnings with clang and option
-fsanitize=undefined enabled.
print-rt6.c:66:3: runtime error: member access within misaligned address
0x61d00001eab6 for type 'const struct ip6_rthdr0', which requires 4 byte
alignment
0x61d00001eab6: note: pointer points here
00 00 00 04 3a 02 00 01 00 00 00 00 22 00 00 00 00 00 02 10 00 02 00 00 00 00 00 04 80 00 d3 ab
^
SUMMARY: AddressSanitizer: undefined-behavior print-rt6.c:66:3 in
218 lines
8.1 KiB
C
218 lines
8.1 KiB
C
/* NetBSD: ip6.h,v 1.9 2000/07/13 05:34:21 itojun Exp */
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/* $KAME: ip6.h,v 1.9 2000/07/02 21:01:32 itojun Exp $ */
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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nd_uint32_t ip6_un1_flow; /* 20 bits of flow-ID */
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nd_uint16_t ip6_un1_plen; /* payload length */
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nd_uint8_t ip6_un1_nxt; /* next header */
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nd_uint8_t ip6_un1_hlim; /* hop limit */
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} ip6_un1;
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nd_uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
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} ip6_ctlun;
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nd_ipv6 ip6_src; /* source address */
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nd_ipv6 ip6_dst; /* destination address */
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} ND_UNALIGNED;
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#define ip6_vfc ip6_ctlun.ip6_un2_vfc
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#define IP6_VERSION(ip6_hdr) ((EXTRACT_U_1((ip6_hdr)->ip6_vfc) & 0xf0) >> 4)
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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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/* in network endian */
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#define IPV6_FLOWINFO_MASK ((uint32_t)htonl(0x0fffffff)) /* flow info (28 bits) */
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#define IPV6_FLOWLABEL_MASK ((uint32_t)htonl(0x000fffff)) /* flow label (20 bits) */
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#if 1
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/* ECN bits proposed by Sally Floyd */
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#define IP6TOS_CE 0x01 /* congestion experienced */
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#define IP6TOS_ECT 0x02 /* ECN-capable transport */
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#endif
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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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nd_uint8_t ip6e_nxt;
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nd_uint8_t ip6e_len;
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} ND_UNALIGNED;
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/* Hop-by-Hop options header */
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struct ip6_hbh {
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nd_uint8_t ip6h_nxt; /* next header */
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nd_uint8_t ip6h_len; /* length in units of 8 octets */
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/* followed by options */
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} ND_UNALIGNED;
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/* Destination options header */
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struct ip6_dest {
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nd_uint8_t ip6d_nxt; /* next header */
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nd_uint8_t ip6d_len; /* length in units of 8 octets */
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/* followed by options */
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} ND_UNALIGNED;
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/* http://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml */
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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_JUMBO_LEN 6
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#define IP6OPT_RPL 0x63 /* 01 1 00011 */
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#define IP6OPT_TUN_ENC_LIMIT 0x04 /* 00 0 00100 */
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#define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 */
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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_QUICK_START 0x26 /* 00 1 00110 */
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#define IP6OPT_CALIPSO 0x07 /* 00 0 00111 */
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#define IP6OPT_SMF_DPD 0x08 /* 00 0 01000 */
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#define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */
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#define IP6OPT_HOMEADDR_MINLEN 18
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#define IP6OPT_EID 0x8a /* 10 0 01010 */
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#define IP6OPT_ILNP_NOTICE 0x8b /* 10 0 01011 */
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#define IP6OPT_LINE_ID 0x8c /* 10 0 01100 */
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#define IP6OPT_MPL 0x6d /* 01 1 01101 */
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#define IP6OPT_IP_DFF 0xee /* 11 1 01110 */
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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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/* Routing header */
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struct ip6_rthdr {
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nd_uint8_t ip6r_nxt; /* next header */
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nd_uint8_t ip6r_len; /* length in units of 8 octets */
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nd_uint8_t ip6r_type; /* routing type */
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nd_uint8_t ip6r_segleft; /* segments left */
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/* followed by routing type specific data */
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} ND_UNALIGNED;
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#define IPV6_RTHDR_TYPE_0 0
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#define IPV6_RTHDR_TYPE_2 2
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#define IPV6_RTHDR_TYPE_4 4
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/* Type 0 Routing header */
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/* Also used for Type 2 */
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struct ip6_rthdr0 {
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nd_uint8_t ip6r0_nxt; /* next header */
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nd_uint8_t ip6r0_len; /* length in units of 8 octets */
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nd_uint8_t ip6r0_type; /* always zero */
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nd_uint8_t ip6r0_segleft; /* segments left */
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nd_uint32_t ip6r0_reserved; /* reserved field */
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nd_ipv6 ip6r0_addr[1]; /* up to 23 addresses */
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};
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/**
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* Type 4 Routing header
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* known as Segment Routing Header 'SRH'
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*/
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struct ip6_srh {
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nd_uint8_t srh_nxt; /* next header */
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nd_uint8_t srh_len; /* length in units of 8 octets */
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nd_uint8_t srh_type; /* Routing Type 4 */
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nd_uint8_t srh_segleft; /* segments left */
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nd_uint8_t srh_last_ent; /* Last Entry*/
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nd_uint8_t srh_flags; /* Flags */
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nd_uint16_t srh_tag; /* Tag */
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nd_ipv6 srh_segments[1]; /* SRH segments list*/
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};
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/* Fragment header */
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struct ip6_frag {
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nd_uint8_t ip6f_nxt; /* next header */
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nd_uint8_t ip6f_reserved; /* reserved field */
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nd_uint16_t ip6f_offlg; /* offset, reserved, and flag */
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nd_uint32_t ip6f_ident; /* identification */
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} ND_UNALIGNED;
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#define IP6F_OFF_MASK 0xfff8 /* mask out offset from ip6f_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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#endif /* not _NETINET_IP6_H_ */
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