a30cb31589
o Retire global always running ipreass_slowtimo(). o Instead use one callout entry per hash slot. The per-slot callout would be scheduled only if a slot has entries, and would be driven by TTL of the very last entry. o Make net.inet.ip.fragttl read/write and document it. o Retire IPFRAGTTL, which used to be meaningful only with PR_SLOWTIMO. Differential revision: https://reviews.freebsd.org/D36275
229 lines
7.3 KiB
C
229 lines
7.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California.
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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 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 8.2 (Berkeley) 6/1/94
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* $FreeBSD$
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*/
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#ifndef _NETINET_IP_H_
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#define _NETINET_IP_H_
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#include <sys/cdefs.h>
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/*
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* Definitions for internet protocol version 4.
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*
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* Per RFC 791, September 1981.
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*/
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#define IPVERSION 4
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/*
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* Structure of an internet header, naked of options.
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*/
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struct ip {
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#if BYTE_ORDER == LITTLE_ENDIAN
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u_char ip_hl:4, /* header length */
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ip_v:4; /* version */
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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u_char ip_v:4, /* version */
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ip_hl:4; /* header length */
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#endif
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u_char ip_tos; /* type of service */
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u_short ip_len; /* total length */
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u_short ip_id; /* identification */
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u_short ip_off; /* fragment offset field */
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#define IP_RF 0x8000 /* reserved fragment flag */
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#define IP_DF 0x4000 /* dont fragment flag */
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#define IP_MF 0x2000 /* more fragments flag */
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#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
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u_char ip_ttl; /* time to live */
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u_char ip_p; /* protocol */
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u_short ip_sum; /* checksum */
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struct in_addr ip_src,ip_dst; /* source and dest address */
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} __packed __aligned(2);
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#define IP_MAXPACKET 65535 /* maximum packet size */
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/*
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* Definitions for IP type of service (ip_tos).
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*/
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#define IPTOS_LOWDELAY 0x10
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#define IPTOS_THROUGHPUT 0x08
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#define IPTOS_RELIABILITY 0x04
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#define IPTOS_MINCOST IPTOS_DSCP_CS0
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/*
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* Definitions for IP precedence (also in ip_tos) (deprecated).
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*/
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#define IPTOS_PREC_NETCONTROL IPTOS_DSCP_CS7
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#define IPTOS_PREC_INTERNETCONTROL IPTOS_DSCP_CS6
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#define IPTOS_PREC_CRITIC_ECP IPTOS_DSCP_CS5
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#define IPTOS_PREC_FLASHOVERRIDE IPTOS_DSCP_CS4
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#define IPTOS_PREC_FLASH IPTOS_DSCP_CS3
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#define IPTOS_PREC_IMMEDIATE IPTOS_DSCP_CS2
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#define IPTOS_PREC_PRIORITY IPTOS_DSCP_CS1
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#define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0
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/*
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* Offset of Diffserv decimal value to convert it to tos value .
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*/
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#define IPTOS_DSCP_OFFSET 2
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/*
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* Definitions for DiffServ Codepoints as per RFC2474 and RFC5865.
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*/
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#define IPTOS_DSCP_CS0 0x00
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#define IPTOS_DSCP_CS1 0x20
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#define IPTOS_DSCP_AF11 0x28
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#define IPTOS_DSCP_AF12 0x30
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#define IPTOS_DSCP_AF13 0x38
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#define IPTOS_DSCP_CS2 0x40
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#define IPTOS_DSCP_AF21 0x48
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#define IPTOS_DSCP_AF22 0x50
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#define IPTOS_DSCP_AF23 0x58
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#define IPTOS_DSCP_CS3 0x60
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#define IPTOS_DSCP_AF31 0x68
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#define IPTOS_DSCP_AF32 0x70
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#define IPTOS_DSCP_AF33 0x78
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#define IPTOS_DSCP_CS4 0x80
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#define IPTOS_DSCP_AF41 0x88
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#define IPTOS_DSCP_AF42 0x90
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#define IPTOS_DSCP_AF43 0x98
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#define IPTOS_DSCP_CS5 0xa0
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#define IPTOS_DSCP_VA 0xb0
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#define IPTOS_DSCP_EF 0xb8
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#define IPTOS_DSCP_CS6 0xc0
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#define IPTOS_DSCP_CS7 0xe0
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/*
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* ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the
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* lower 2 bits of the TOS field.
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*/
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#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
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#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
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#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
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#define IPTOS_ECN_CE 0x03 /* congestion experienced */
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#define IPTOS_ECN_MASK 0x03 /* ECN field mask */
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/*
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* Definitions for options.
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*/
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#define IPOPT_COPIED(o) ((o)&0x80)
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#define IPOPT_CLASS(o) ((o)&0x60)
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#define IPOPT_NUMBER(o) ((o)&0x1f)
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#define IPOPT_CONTROL 0x00
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#define IPOPT_RESERVED1 0x20
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#define IPOPT_DEBMEAS 0x40
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#define IPOPT_RESERVED2 0x60
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#define IPOPT_EOL 0 /* end of option list */
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#define IPOPT_NOP 1 /* no operation */
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#define IPOPT_RR 7 /* record packet route */
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#define IPOPT_TS 68 /* timestamp */
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#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
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#define IPOPT_LSRR 131 /* loose source route */
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#define IPOPT_ESO 133 /* extended security */
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#define IPOPT_CIPSO 134 /* commercial security */
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#define IPOPT_SATID 136 /* satnet id */
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#define IPOPT_SSRR 137 /* strict source route */
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#define IPOPT_RA 148 /* router alert */
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/*
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* Offsets to fields in options other than EOL and NOP.
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*/
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#define IPOPT_OPTVAL 0 /* option ID */
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#define IPOPT_OLEN 1 /* option length */
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#define IPOPT_OFFSET 2 /* offset within option */
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#define IPOPT_MINOFF 4 /* min value of above */
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/*
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* Time stamp option structure.
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*/
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struct ip_timestamp {
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u_char ipt_code; /* IPOPT_TS */
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u_char ipt_len; /* size of structure (variable) */
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u_char ipt_ptr; /* index of current entry */
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#if BYTE_ORDER == LITTLE_ENDIAN
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u_char ipt_flg:4, /* flags, see below */
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ipt_oflw:4; /* overflow counter */
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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u_char ipt_oflw:4, /* overflow counter */
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ipt_flg:4; /* flags, see below */
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#endif
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union ipt_timestamp {
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uint32_t ipt_time[1]; /* network format */
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struct ipt_ta {
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struct in_addr ipt_addr;
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uint32_t ipt_time; /* network format */
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} ipt_ta[1];
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} ipt_timestamp;
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};
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/* Flag bits for ipt_flg. */
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#define IPOPT_TS_TSONLY 0 /* timestamps only */
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#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
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#define IPOPT_TS_PRESPEC 3 /* specified modules only */
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/* Bits for security (not byte swapped). */
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#define IPOPT_SECUR_UNCLASS 0x0000
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#define IPOPT_SECUR_CONFID 0xf135
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#define IPOPT_SECUR_EFTO 0x789a
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#define IPOPT_SECUR_MMMM 0xbc4d
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#define IPOPT_SECUR_RESTR 0xaf13
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#define IPOPT_SECUR_SECRET 0xd788
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#define IPOPT_SECUR_TOPSECRET 0x6bc5
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/*
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* Internet implementation parameters.
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*/
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#define MAXTTL 255 /* maximum time to live (seconds) */
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#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
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#define IPTTLDEC 1 /* subtracted when forwarding */
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#define IP_MSS 576 /* default maximum segment size */
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/*
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* This is the real IPv4 pseudo header, used for computing the TCP and UDP
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* checksums. For the Internet checksum, struct ipovly can be used instead.
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* For stronger checksums, the real thing must be used.
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*/
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struct ippseudo {
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struct in_addr ippseudo_src; /* source internet address */
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struct in_addr ippseudo_dst; /* destination internet address */
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u_char ippseudo_pad; /* pad, must be zero */
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u_char ippseudo_p; /* protocol */
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u_short ippseudo_len; /* protocol length */
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};
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#endif
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