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ip.h
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ip.h
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/*
* 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. 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
* ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
*/
#ifndef IP_H
#define IP_H
#ifdef HOST_WORDS_BIGENDIAN
# undef NTOHL
# undef NTOHS
# undef HTONL
# undef HTONS
# define NTOHL(d)
# define NTOHS(d)
# define HTONL(d)
# define HTONS(d)
#else
# ifndef NTOHL
# define NTOHL(d) ((d) = ntohl((d)))
# endif
# ifndef NTOHS
# define NTOHS(d) ((d) = ntohs((uint16_t)(d)))
# endif
# ifndef HTONL
# define HTONL(d) ((d) = htonl((d)))
# endif
# ifndef HTONS
# define HTONS(d) ((d) = htons((uint16_t)(d)))
# endif
#endif
typedef uint32_t n_long; /* long as received from the net */
/*
* Definitions for internet protocol version 4.
* Per RFC 791, September 1981.
*/
#define IPVERSION 4
/*
* Structure of an internet header, naked of options.
*/
struct ip {
#ifdef HOST_WORDS_BIGENDIAN
uint8_t ip_v:4, /* version */
ip_hl:4; /* header length */
#else
uint8_t ip_hl:4, /* header length */
ip_v:4; /* version */
#endif
uint8_t ip_tos; /* type of service */
uint16_t ip_len; /* total length */
uint16_t ip_id; /* identification */
uint16_t ip_off; /* fragment offset field */
#define IP_DF 0x4000 /* don't fragment flag */
#define IP_MF 0x2000 /* more fragments flag */
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
uint8_t ip_ttl; /* time to live */
uint8_t ip_p; /* protocol */
uint16_t ip_sum; /* checksum */
struct in_addr ip_src,ip_dst; /* source and dest address */
} QEMU_PACKED;
#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 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_SATID 136 /* satnet id */
#define IPOPT_SSRR 137 /* strict source route */
/*
* 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 {
uint8_t ipt_code; /* IPOPT_TS */
uint8_t ipt_len; /* size of structure (variable) */
uint8_t ipt_ptr; /* index of current entry */
#ifdef HOST_WORDS_BIGENDIAN
uint8_t ipt_oflw:4, /* overflow counter */
ipt_flg:4; /* flags, see below */
#else
uint8_t ipt_flg:4, /* flags, see below */
ipt_oflw:4; /* overflow counter */
#endif
union ipt_timestamp {
n_long ipt_time[1];
struct ipt_ta {
struct in_addr ipt_addr;
n_long ipt_time;
} ipt_ta[1];
} ipt_timestamp;
} QEMU_PACKED;
/* 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 */
#if SIZEOF_CHAR_P == 4
struct mbuf_ptr {
struct mbuf *mptr;
uint32_t dummy;
} QEMU_PACKED;
#else
struct mbuf_ptr {
struct mbuf *mptr;
} QEMU_PACKED;
#endif
struct qlink {
void *next, *prev;
};
/*
* Overlay for ip header used by other protocols (tcp, udp).
*/
struct ipovly {
struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */
uint8_t ih_x1; /* (unused) */
uint8_t ih_pr; /* protocol */
uint16_t ih_len; /* protocol length */
struct in_addr ih_src; /* source internet address */
struct in_addr ih_dst; /* destination internet address */
} QEMU_PACKED;
/*
* Ip reassembly queue structure. Each fragment
* being reassembled is attached to one of these structures.
* They are timed out after ipq_ttl drops to 0, and may also
* be reclaimed if memory becomes tight.
* size 28 bytes
*/
struct ipq {
struct qlink frag_link; /* to ip headers of fragments */
struct qlink ip_link; /* to other reass headers */
uint8_t ipq_ttl; /* time for reass q to live */
uint8_t ipq_p; /* protocol of this fragment */
uint16_t ipq_id; /* sequence id for reassembly */
struct in_addr ipq_src,ipq_dst;
} QEMU_PACKED;
/*
* Ip header, when holding a fragment.
*
* Note: ipf_link must be at same offset as frag_link above
*/
struct ipasfrag {
struct qlink ipf_link;
struct ip ipf_ip;
} QEMU_PACKED;
#define ipf_off ipf_ip.ip_off
#define ipf_tos ipf_ip.ip_tos
#define ipf_len ipf_ip.ip_len
#define ipf_next ipf_link.next
#define ipf_prev ipf_link.prev
#endif