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ip.h
/* Copyright (C) 1991-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef __NETINET_IP_H #define __NETINET_IP_H 1 #include <features.h> #include <sys/types.h> #include <netinet/in.h> __BEGIN_DECLS struct timestamp { uint8_t len; uint8_t ptr; #if __BYTE_ORDER == __LITTLE_ENDIAN unsigned int flags:4; unsigned int overflow:4; #elif __BYTE_ORDER == __BIG_ENDIAN unsigned int overflow:4; unsigned int flags:4; #else # error "Please fix <bits/endian.h>" #endif uint32_t data[9]; }; struct iphdr { #if __BYTE_ORDER == __LITTLE_ENDIAN unsigned int ihl:4; unsigned int version:4; #elif __BYTE_ORDER == __BIG_ENDIAN unsigned int version:4; unsigned int ihl:4; #else # error "Please fix <bits/endian.h>" #endif uint8_t tos; uint16_t tot_len; uint16_t id; uint16_t frag_off; uint8_t ttl; uint8_t protocol; uint16_t check; uint32_t saddr; uint32_t daddr; /*The options start here. */ }; #ifdef __USE_MISC /* * 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 */ /* * Definitions for internet protocol version 4. * Per RFC 791, September 1981. */ /* * Structure of an internet header, naked of options. */ struct ip { #if __BYTE_ORDER == __LITTLE_ENDIAN unsigned int ip_hl:4; /* header length */ unsigned int ip_v:4; /* version */ #endif #if __BYTE_ORDER == __BIG_ENDIAN unsigned int ip_v:4; /* version */ unsigned int ip_hl:4; /* header length */ #endif uint8_t ip_tos; /* type of service */ unsigned short ip_len; /* total length */ unsigned short ip_id; /* identification */ unsigned short ip_off; /* fragment offset field */ #define IP_RF 0x8000 /* reserved fragment flag */ #define IP_DF 0x4000 /* dont fragment flag */ #define IP_MF 0x2000 /* more fragments flag */ #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ uint8_t ip_ttl; /* time to live */ uint8_t ip_p; /* protocol */ unsigned short ip_sum; /* checksum */ struct in_addr ip_src, ip_dst; /* source and dest address */ }; /* * Time stamp option structure. */ struct ip_timestamp { uint8_t ipt_code; /* IPOPT_TS */ uint8_t ipt_len; /* size of structure (variable) */ uint8_t ipt_ptr; /* index of current entry */ #if __BYTE_ORDER == __LITTLE_ENDIAN unsigned int ipt_flg:4; /* flags, see below */ unsigned int ipt_oflw:4; /* overflow counter */ #endif #if __BYTE_ORDER == __BIG_ENDIAN unsigned int ipt_oflw:4; /* overflow counter */ unsigned int ipt_flg:4; /* flags, see below */ #endif uint32_t data[9]; }; #endif /* __USE_MISC */ #define IPVERSION 4 /* IP version number */ #define IP_MAXPACKET 65535 /* maximum packet size */ /* * Definitions for Explicit Congestion Notification (ECN) * * Taken from RFC-3168, Section 5. */ #define IPTOS_ECN_MASK 0x03 #define IPTOS_ECN(x) ((x) & IPTOS_ECN_MASK) #define IPTOS_ECN_NOT_ECT 0x00 #define IPTOS_ECN_ECT1 0x01 #define IPTOS_ECN_ECT0 0x02 #define IPTOS_ECN_CE 0x03 /* * Definitions for IP differentiated services code points (DSCP) * * Taken from RFC-2597, Section 6 and RFC-2598, Section 2.3. */ #define IPTOS_DSCP_MASK 0xfc #define IPTOS_DSCP(x) ((x) & IPTOS_DSCP_MASK) #define IPTOS_DSCP_AF11 0x28 #define IPTOS_DSCP_AF12 0x30 #define IPTOS_DSCP_AF13 0x38 #define IPTOS_DSCP_AF21 0x48 #define IPTOS_DSCP_AF22 0x50 #define IPTOS_DSCP_AF23 0x58 #define IPTOS_DSCP_AF31 0x68 #define IPTOS_DSCP_AF32 0x70 #define IPTOS_DSCP_AF33 0x78 #define IPTOS_DSCP_AF41 0x88 #define IPTOS_DSCP_AF42 0x90 #define IPTOS_DSCP_AF43 0x98 #define IPTOS_DSCP_EF 0xb8 /* * In RFC 2474, Section 4.2.2.1, the Class Selector Codepoints subsume * the old ToS Precedence values. */ #define IPTOS_CLASS_MASK 0xe0 #define IPTOS_CLASS(class) ((class) & IPTOS_CLASS_MASK) #define IPTOS_CLASS_CS0 0x00 #define IPTOS_CLASS_CS1 0x20 #define IPTOS_CLASS_CS2 0x40 #define IPTOS_CLASS_CS3 0x60 #define IPTOS_CLASS_CS4 0x80 #define IPTOS_CLASS_CS5 0xa0 #define IPTOS_CLASS_CS6 0xc0 #define IPTOS_CLASS_CS7 0xe0 #define IPTOS_CLASS_DEFAULT IPTOS_CLASS_CS0 /* * Definitions for IP type of service (ip_tos) [deprecated; use DSCP * and CS definitions above instead.] */ #define IPTOS_TOS_MASK 0x1E #define IPTOS_TOS(tos) ((tos) & IPTOS_TOS_MASK) #define IPTOS_LOWDELAY 0x10 #define IPTOS_THROUGHPUT 0x08 #define IPTOS_RELIABILITY 0x04 #define IPTOS_LOWCOST 0x02 #define IPTOS_MINCOST IPTOS_LOWCOST /* * Definitions for IP precedence (also in ip_tos) [also deprecated.] */ #define IPTOS_PREC_MASK IPTOS_CLASS_MASK #define IPTOS_PREC(tos) IPTOS_CLASS(tos) #define IPTOS_PREC_NETCONTROL IPTOS_CLASS_CS7 #define IPTOS_PREC_INTERNETCONTROL IPTOS_CLASS_CS6 #define IPTOS_PREC_CRITIC_ECP IPTOS_CLASS_CS5 #define IPTOS_PREC_FLASHOVERRIDE IPTOS_CLASS_CS4 #define IPTOS_PREC_FLASH IPTOS_CLASS_CS3 #define IPTOS_PREC_IMMEDIATE IPTOS_CLASS_CS2 #define IPTOS_PREC_PRIORITY IPTOS_CLASS_CS1 #define IPTOS_PREC_ROUTINE IPTOS_CLASS_CS0 /* * Definitions for options. */ #define IPOPT_COPY 0x80 #define IPOPT_CLASS_MASK 0x60 #define IPOPT_NUMBER_MASK 0x1f #define IPOPT_COPIED(o) ((o) & IPOPT_COPY) #define IPOPT_CLASS(o) ((o) & IPOPT_CLASS_MASK) #define IPOPT_NUMBER(o) ((o) & IPOPT_NUMBER_MASK) #define IPOPT_CONTROL 0x00 #define IPOPT_RESERVED1 0x20 #define IPOPT_DEBMEAS 0x40 #define IPOPT_MEASUREMENT IPOPT_DEBMEAS #define IPOPT_RESERVED2 0x60 #define IPOPT_EOL 0 /* end of option list */ #define IPOPT_END IPOPT_EOL #define IPOPT_NOP 1 /* no operation */ #define IPOPT_NOOP IPOPT_NOP #define IPOPT_RR 7 /* record packet route */ #define IPOPT_TS 68 /* timestamp */ #define IPOPT_TIMESTAMP IPOPT_TS #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ #define IPOPT_SEC IPOPT_SECURITY #define IPOPT_LSRR 131 /* loose source route */ #define IPOPT_SATID 136 /* satnet id */ #define IPOPT_SID IPOPT_SATID #define IPOPT_SSRR 137 /* strict source route */ #define IPOPT_RA 148 /* router alert */ /* * Offsets to fields in options other than EOL and NOP. */ #define IPOPT_OPTVAL 0 /* option ID */ #define IPOPT_OLEN 1 /* option length */ #define IPOPT_OFFSET 2 /* offset within option */ #define IPOPT_MINOFF 4 /* min value of above */ #define MAX_IPOPTLEN 40 /* flag bits for ipt_flg */ #define IPOPT_TS_TSONLY 0 /* timestamps only */ #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ #define IPOPT_TS_PRESPEC 3 /* specified modules only */ /* bits for security (not byte swapped) */ #define IPOPT_SECUR_UNCLASS 0x0000 #define IPOPT_SECUR_CONFID 0xf135 #define IPOPT_SECUR_EFTO 0x789a #define IPOPT_SECUR_MMMM 0xbc4d #define IPOPT_SECUR_RESTR 0xaf13 #define IPOPT_SECUR_SECRET 0xd788 #define IPOPT_SECUR_TOPSECRET 0x6bc5 /* * Internet implementation parameters. */ #define MAXTTL 255 /* maximum time to live (seconds) */ #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ #define IPFRAGTTL 60 /* time to live for frags, slowhz */ #define IPTTLDEC 1 /* subtracted when forwarding */ #define IP_MSS 576 /* default maximum segment size */ __END_DECLS #endif /* netinet/ip.h */
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