| /* @(#) $Header: /tcpdump/master/tcpdump/ip.h,v 1.12 2007-09-14 01:29:28 guy Exp $ (LBL) */ |
| /* |
| * 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. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by the University of |
| * California, Berkeley and its contributors. |
| * 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 8.2 (Berkeley) 6/1/94 |
| */ |
| |
| /* |
| * Definitions for internet protocol version 4. |
| * Per RFC 791, September 1981. |
| */ |
| #define IPVERSION 4 |
| |
| /* |
| * Structure of an internet header, naked of options. |
| * |
| * We declare ip_len and ip_off to be short, rather than u_short |
| * pragmatically since otherwise unsigned comparisons can result |
| * against negative integers quite easily, and fail in subtle ways. |
| */ |
| struct ip { |
| u_int8_t ip_vhl; /* header length, version */ |
| #define IP_V(ip) (((ip)->ip_vhl & 0xf0) >> 4) |
| #define IP_HL(ip) ((ip)->ip_vhl & 0x0f) |
| u_int8_t ip_tos; /* type of service */ |
| u_int16_t ip_len; /* total length */ |
| u_int16_t ip_id; /* identification */ |
| u_int16_t ip_off; /* fragment offset field */ |
| #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_int16_t ip_sum; /* checksum */ |
| struct in_addr ip_src,ip_dst; /* source and dest address */ |
| } UNALIGNED; |
| |
| #define IP_MAXPACKET 65535 /* maximum packet size */ |
| |
| /* |
| * Definitions for IP type of service (ip_tos) |
| */ |
| #define IPTOS_LOWDELAY 0x10 |
| #define IPTOS_THROUGHPUT 0x08 |
| #define IPTOS_RELIABILITY 0x04 |
| |
| /* |
| * Definitions for IP precedence (also in ip_tos) (hopefully unused) |
| */ |
| #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_COPIED(o) ((o)&0x80) |
| #define IPOPT_CLASS(o) ((o)&0x60) |
| #define IPOPT_NUMBER(o) ((o)&0x1f) |
| |
| #define IPOPT_CONTROL 0x00 |
| #define IPOPT_RESERVED1 0x20 |
| #define IPOPT_DEBMEAS 0x40 |
| #define IPOPT_RESERVED2 0x60 |
| |
| #define IPOPT_EOL 0 /* end of option list */ |
| #define IPOPT_NOP 1 /* no operation */ |
| |
| #define IPOPT_RR 7 /* record packet route */ |
| #define IPOPT_TS 68 /* timestamp */ |
| #define IPOPT_RFC1393 82 /* traceroute RFC 1393 */ |
| #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
| #define IPOPT_LSRR 131 /* loose source route */ |
| #define IPOPT_SATID 136 /* satnet id */ |
| #define IPOPT_SSRR 137 /* strict source route */ |
| #define IPOPT_RA 148 /* router-alert, rfc2113 */ |
| |
| /* |
| * 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 */ |
| |
| /* |
| * 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 */ |
| u_int8_t ipt_oflwflg; /* flags, overflow counter */ |
| #define IPTS_OFLW(ip) (((ipt)->ipt_oflwflg & 0xf0) >> 4) |
| #define IPTS_FLG(ip) ((ipt)->ipt_oflwflg & 0x0f) |
| union ipt_timestamp { |
| u_int32_t ipt_time[1]; |
| struct ipt_ta { |
| struct in_addr ipt_addr; |
| u_int32_t ipt_time; |
| } ipt_ta[1]; |
| } ipt_timestamp; |
| } UNALIGNED; |
| |
| /* 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 */ |
| |
| /* in print-ip.c */ |
| extern int nextproto4_cksum(const struct ip *, const u_int8_t *, u_int, u_int); |