ip.h
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上传日期:2009-04-28
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- /* Copyright (C) 1991,92,93,95,96,97,98,99,2000 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #ifndef __NETINET_IP_H
- #define __NETINET_IP_H 1
- #include <features.h>
- #include <sys/types.h>
- #include <netinet/in.h>
- __BEGIN_DECLS
- struct timestamp
- {
- u_int8_t len;
- u_int8_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
- u_int32_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
- u_int8_t tos;
- u_int16_t tot_len;
- u_int16_t id;
- u_int16_t frag_off;
- u_int8_t ttl;
- u_int8_t protocol;
- u_int16_t check;
- u_int32_t saddr;
- u_int32_t daddr;
- /*The options start here. */
- };
- #ifdef __USE_BSD
- /*
- * 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
- u_int8_t ip_tos; /* type of service */
- u_short ip_len; /* total length */
- u_short ip_id; /* identification */
- u_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 */
- u_int8_t ip_ttl; /* time to live */
- u_int8_t ip_p; /* protocol */
- u_short ip_sum; /* checksum */
- struct in_addr ip_src, ip_dst; /* source and dest address */
- };
- /*
- * Time stamp option structure.
- */
- struct ip_timestamp
- {
- u_int8_t ipt_code; /* IPOPT_TS */
- u_int8_t ipt_len; /* size of structure (variable) */
- u_int8_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
- u_int32_t data[9];
- };
- #endif /* __USE_BSD */
- #define IPVERSION 4 /* IP version number */
- #define IP_MAXPACKET 65535 /* maximum packet size */
- /*
- * Definitions for IP type of service (ip_tos)
- */
- #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) (hopefully unused)
- */
- #define IPTOS_PREC_MASK 0xe0
- #define IPTOS_PREC(tos) ((tos) & IPTOS_PREC_MASK)
- #define IPTOS_PREC_NETCONTROL 0xe0
- #define IPTOS_PREC_INTERNETCONTROL 0xc0
- #define IPTOS_PREC_CRITIC_ECP 0xa0
- #define IPTOS_PREC_FLASHOVERRIDE 0x80
- #define IPTOS_PREC_FLASH 0x60
- #define IPTOS_PREC_IMMEDIATE 0x40
- #define IPTOS_PREC_PRIORITY 0x20
- #define IPTOS_PREC_ROUTINE 0x00
- /*
- * 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 */