254 lines
7.2 KiB
C
254 lines
7.2 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. 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 8.1 (Berkeley) 6/10/93
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* ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
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*/
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#ifndef _IP_H_
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#define _IP_H_
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#ifdef HOST_WORDS_BIGENDIAN
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# ifndef NTOHL
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# define NTOHL(d)
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# endif
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# ifndef NTOHS
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# define NTOHS(d)
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# endif
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# ifndef HTONL
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# define HTONL(d)
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# endif
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# ifndef HTONS
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# define HTONS(d)
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# endif
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#else
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# ifndef NTOHL
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# define NTOHL(d) ((d) = ntohl((d)))
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# endif
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# ifndef NTOHS
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# define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
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# endif
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# ifndef HTONL
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# define HTONL(d) ((d) = htonl((d)))
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# endif
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# ifndef HTONS
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# define HTONS(d) ((d) = htons((u_int16_t)(d)))
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# endif
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#endif
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typedef u_int32_t n_long; /* long as received from the net */
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/*
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* Definitions for internet protocol version 4.
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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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#ifdef HOST_WORDS_BIGENDIAN
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u_int ip_v:4, /* version */
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ip_hl:4; /* header length */
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#else
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u_int ip_hl:4, /* header length */
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ip_v:4; /* version */
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#endif
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u_int8_t ip_tos; /* type of service */
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u_int16_t ip_len; /* total length */
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u_int16_t ip_id; /* identification */
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u_int16_t ip_off; /* fragment offset field */
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#define IP_DF 0x4000 /* don't 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_int8_t ip_ttl; /* time to live */
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u_int8_t ip_p; /* protocol */
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u_int16_t ip_sum; /* checksum */
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struct in_addr ip_src,ip_dst; /* source and dest address */
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};
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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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/*
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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_SATID 136 /* satnet id */
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#define IPOPT_SSRR 137 /* strict source route */
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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_int8_t ipt_code; /* IPOPT_TS */
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u_int8_t ipt_len; /* size of structure (variable) */
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u_int8_t ipt_ptr; /* index of current entry */
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#ifdef HOST_WORDS_BIGENDIAN
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u_int ipt_oflw:4, /* overflow counter */
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ipt_flg:4; /* flags, see below */
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#else
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u_int ipt_flg:4, /* flags, see below */
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ipt_oflw:4; /* overflow counter */
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#endif
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union ipt_timestamp {
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n_long ipt_time[1];
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struct ipt_ta {
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struct in_addr ipt_addr;
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n_long ipt_time;
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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 IPFRAGTTL 60 /* time to live for frags, slowhz */
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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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#if SIZEOF_CHAR_P == 4
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struct mbuf_ptr {
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struct mbuf *mptr;
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uint32_t dummy;
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};
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#else
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struct mbuf_ptr {
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struct mbuf *mptr;
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};
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#endif
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struct qlink {
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void *next, *prev;
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};
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/*
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* Overlay for ip header used by other protocols (tcp, udp).
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*/
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struct ipovly {
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struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */
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u_int8_t ih_x1; /* (unused) */
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u_int8_t ih_pr; /* protocol */
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u_int16_t ih_len; /* protocol length */
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struct in_addr ih_src; /* source internet address */
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struct in_addr ih_dst; /* destination internet address */
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} __attribute__((packed));
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/*
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* Ip reassembly queue structure. Each fragment
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* being reassembled is attached to one of these structures.
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* They are timed out after ipq_ttl drops to 0, and may also
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* be reclaimed if memory becomes tight.
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* size 28 bytes
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*/
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struct ipq {
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struct qlink frag_link; /* to ip headers of fragments */
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struct qlink ip_link; /* to other reass headers */
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u_int8_t ipq_ttl; /* time for reass q to live */
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u_int8_t ipq_p; /* protocol of this fragment */
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u_int16_t ipq_id; /* sequence id for reassembly */
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struct in_addr ipq_src,ipq_dst;
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};
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/*
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* Ip header, when holding a fragment.
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*
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* Note: ipf_link must be at same offset as frag_link above
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*/
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struct ipasfrag {
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struct qlink ipf_link;
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struct ip ipf_ip;
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};
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#define ipf_off ipf_ip.ip_off
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#define ipf_tos ipf_ip.ip_tos
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#define ipf_len ipf_ip.ip_len
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#define ipf_next ipf_link.next
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#define ipf_prev ipf_link.prev
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/*
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* Structure stored in mbuf in inpcb.ip_options
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* and passed to ip_output when ip options are in use.
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* The actual length of the options (including ipopt_dst)
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* is in m_len.
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*/
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#define MAX_IPOPTLEN 40
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struct ipoption {
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struct in_addr ipopt_dst; /* first-hop dst if source routed */
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int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
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};
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#endif
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