| /*- |
| * 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 8.2 (Berkeley) 6/1/94 |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _BSD_NETINET_IP_H_ |
| #define _BSD_NETINET_IP_H_ |
| |
| #include <sys/bsd_cdefs.h> |
| |
| /* |
| * Definitions for internet protocol version 4. |
| * |
| * Per RFC 791, September 1981. |
| */ |
| #define IPVERSION 4 |
| |
| /* |
| * Structure of an internet header, naked of options. |
| */ |
| struct ip { |
| #if BYTE_ORDER == LITTLE_ENDIAN |
| u_int ip_hl:4, /* header length */ |
| ip_v:4; /* version */ |
| #endif |
| #if BYTE_ORDER == BIG_ENDIAN |
| u_int ip_v:4, /* version */ |
| ip_hl:4; /* header length */ |
| #endif |
| u_char 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_char ip_ttl; /* time to live */ |
| u_char ip_p; /* protocol */ |
| u_short ip_sum; /* checksum */ |
| struct in_addr ip_src,ip_dst; /* source and dest address */ |
| } __packed __aligned(4); |
| |
| #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 |
| #define IPTOS_MINCOST 0x02 |
| |
| /* |
| * 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 |
| |
| /* |
| * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the |
| * lower 2 bits of the TOS field. |
| */ |
| #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ |
| #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ |
| #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ |
| #define IPTOS_ECN_CE 0x03 /* congestion experienced */ |
| #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ |
| |
| /* |
| * 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_SECURITY 130 /* provide s,c,h,tcc */ |
| #define IPOPT_LSRR 131 /* loose source route */ |
| #define IPOPT_ESO 133 /* extended security */ |
| #define IPOPT_CIPSO 134 /* commerical security */ |
| #define IPOPT_SATID 136 /* satnet id */ |
| #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 */ |
| |
| /* |
| * Time stamp option structure. |
| */ |
| struct ip_timestamp { |
| u_char ipt_code; /* IPOPT_TS */ |
| u_char ipt_len; /* size of structure (variable) */ |
| u_char ipt_ptr; /* index of current entry */ |
| #if BYTE_ORDER == LITTLE_ENDIAN |
| u_int ipt_flg:4, /* flags, see below */ |
| ipt_oflw:4; /* overflow counter */ |
| #endif |
| #if BYTE_ORDER == BIG_ENDIAN |
| u_int ipt_oflw:4, /* overflow counter */ |
| ipt_flg:4; /* flags, see below */ |
| #endif |
| union ipt_timestamp { |
| uint32_t ipt_time[1]; /* network format */ |
| struct ipt_ta { |
| struct in_addr ipt_addr; |
| uint32_t ipt_time; /* network format */ |
| } ipt_ta[1]; |
| } ipt_timestamp; |
| }; |
| |
| /* 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 */ |
| |
| /* |
| * This is the real IPv4 pseudo header, used for computing the TCP and UDP |
| * checksums. For the Internet checksum, struct ipovly can be used instead. |
| * For stronger checksums, the real thing must be used. |
| */ |
| struct ippseudo { |
| struct in_addr ippseudo_src; /* source internet address */ |
| struct in_addr ippseudo_dst; /* destination internet address */ |
| u_char ippseudo_pad; /* pad, must be zero */ |
| u_char ippseudo_p; /* protocol */ |
| u_short ippseudo_len; /* protocol length */ |
| }; |
| #endif |
