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460fec67ee
The essence of this patch is to stuff (almost) all global variables of the slirp stack into the structure Slirp. In this step, we still keep the structure as global variable, directly accessible by the whole stack. Changes to the external interface of slirp will be applied in the following patches. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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 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 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 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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