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in_proto.c revision 1.18 
      1 /*	$NetBSD: in_proto.c,v 1.18 1998/01/05 10:31:55 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)in_proto.c	8.2 (Berkeley) 2/9/95
     36  */
     37 
     38 #include <sys/param.h>
     39 #include <sys/socket.h>
     40 #include <sys/protosw.h>
     41 #include <sys/domain.h>
     42 #include <sys/mbuf.h>
     43 
     44 #include <net/if.h>
     45 #include <net/radix.h>
     46 #include <net/route.h>
     47 
     48 #include <netinet/in.h>
     49 #include <netinet/in_systm.h>
     50 #include <netinet/ip.h>
     51 #include <netinet/ip_var.h>
     52 #include <netinet/ip_icmp.h>
     53 #include <netinet/in_pcb.h>
     54 #include <netinet/igmp_var.h>
     55 #include <netinet/tcp.h>
     56 #include <netinet/tcp_fsm.h>
     57 #include <netinet/tcp_seq.h>
     58 #include <netinet/tcp_timer.h>
     59 #include <netinet/tcp_var.h>
     60 #include <netinet/tcpip.h>
     61 #include <netinet/tcp_debug.h>
     62 #include <netinet/udp.h>
     63 #include <netinet/udp_var.h>
     64 /*
     65  * TCP/IP protocol family: IP, ICMP, UDP, TCP.
     66  */
     67 
     68 #ifdef NSIP
     69 #include <netns/ns_var.h>
     70 #include <netns/idp_var.h>
     71 #endif /* NSIP */
     72 
     73 #ifdef TPIP
     74 #include <netiso/tp_param.h>
     75 #include <netiso/tp_var.h>
     76 #endif /* TPIP */
     77 
     78 #ifdef EON
     79 #include <netiso/eonvar.h>
     80 #endif /* EON */
     81 
     82 #ifdef MROUTING
     83 #include <netinet/ip_mroute.h>
     84 #endif /* MROUTING */
     85 
     86 extern	struct domain inetdomain;
     87 
     88 struct protosw inetsw[] = {
     89 { 0,		&inetdomain,	0,		0,
     90   0,		ip_output,	0,		0,
     91   0,
     92   ip_init,	0,		ip_slowtimo,	ip_drain,	ip_sysctl
     93 },
     94 { SOCK_DGRAM,	&inetdomain,	IPPROTO_UDP,	PR_ATOMIC|PR_ADDR,
     95   udp_input,	0,		udp_ctlinput,	ip_ctloutput,
     96   udp_usrreq,
     97   udp_init,	0,		0,		0,		udp_sysctl
     98 },
     99 { SOCK_STREAM,	&inetdomain,	IPPROTO_TCP,	PR_CONNREQUIRED|PR_WANTRCVD,
    100   tcp_input,	0,		tcp_ctlinput,	tcp_ctloutput,
    101   tcp_usrreq,
    102   tcp_init,	tcp_fasttimo,	tcp_slowtimo,	tcp_drain,	tcp_sysctl
    103 },
    104 { SOCK_RAW,	&inetdomain,	IPPROTO_RAW,	PR_ATOMIC|PR_ADDR,
    105   rip_input,	rip_output,	0,		rip_ctloutput,
    106   rip_usrreq,
    107   0,		0,		0,		0,
    108 },
    109 { SOCK_RAW,	&inetdomain,	IPPROTO_ICMP,	PR_ATOMIC|PR_ADDR,
    110   icmp_input,	rip_output,	0,		rip_ctloutput,
    111   rip_usrreq,
    112   0,		0,		0,		0,		icmp_sysctl
    113 },
    114 #ifdef MROUTING
    115 { SOCK_RAW,	&inetdomain,	IPPROTO_IPIP,	PR_ATOMIC|PR_ADDR,
    116   ipip_input,	rip_output,	0,		rip_ctloutput,
    117   rip_usrreq,	/* XXX */
    118   0,		0,		0,		0,
    119 },
    120 #endif /* MROUTING */
    121 { SOCK_RAW,	&inetdomain,	IPPROTO_IGMP,	PR_ATOMIC|PR_ADDR,
    122   igmp_input,	rip_output,	0,		rip_ctloutput,
    123   rip_usrreq,
    124   igmp_init,	igmp_fasttimo,	igmp_slowtimo,	0,
    125 },
    126 #ifdef TPIP
    127 { SOCK_SEQPACKET,&inetdomain,	IPPROTO_TP,	PR_CONNREQUIRED|PR_WANTRCVD,
    128   tpip_input,	0,		tpip_ctlinput,	tp_ctloutput,
    129   tp_usrreq,
    130   tp_init,	0,		tp_slowtimo,	tp_drain,
    131 },
    132 #endif /* TPIP */
    133 /* EON (ISO CLNL over IP) */
    134 #ifdef EON
    135 { SOCK_RAW,	&inetdomain,	IPPROTO_EON,	0,
    136   eoninput,	0,		eonctlinput,		0,
    137   0,
    138   eonprotoinit,	0,		0,		0,
    139 },
    140 #endif /* EON */
    141 #ifdef NSIP
    142 { SOCK_RAW,	&inetdomain,	IPPROTO_IDP,	PR_ATOMIC|PR_ADDR,
    143   idpip_input,	NULL,		nsip_ctlinput,	0,
    144   rip_usrreq,
    145   0,		0,		0,		0,
    146 },
    147 #endif /* NSIP */
    148 /* raw wildcard */
    149 { SOCK_RAW,	&inetdomain,	0,		PR_ATOMIC|PR_ADDR,
    150   rip_input,	rip_output,	0,		rip_ctloutput,
    151   rip_usrreq,
    152   rip_init,	0,		0,		0,
    153 },
    154 };
    155 
    156 struct domain inetdomain =
    157     { AF_INET, "internet", 0, 0, 0,
    158       inetsw, &inetsw[sizeof(inetsw)/sizeof(inetsw[0])], 0,
    159       rn_inithead, 32, sizeof(struct sockaddr_in) };
    160 
    161 #ifdef notyet /* XXXX */
    162 #include "imp.h"
    163 #if NIMP > 0
    164 extern	struct domain impdomain;
    165 int	rimp_output(), hostslowtimo();
    166 
    167 struct protosw impsw[] = {
    168 { SOCK_RAW,	&impdomain,	0,		PR_ATOMIC|PR_ADDR,
    169   0,		rimp_output,	0,		0,
    170   rip_usrreq,
    171   0,		0,		hostslowtimo,	0,
    172 },
    173 };
    174 
    175 struct domain impdomain =
    176     { AF_IMPLINK, "imp", 0, 0, 0,
    177       impsw, &impsw[sizeof (impsw)/sizeof(impsw[0])] };
    178 #endif
    179 
    180 #include "hy.h"
    181 #if NHY > 0
    182 /*
    183  * HYPERchannel protocol family: raw interface.
    184  */
    185 int	rhy_output();
    186 extern	struct domain hydomain;
    187 
    188 struct protosw hysw[] = {
    189 { SOCK_RAW,	&hydomain,	0,		PR_ATOMIC|PR_ADDR,
    190   0,		rhy_output,	0,		0,
    191   rip_usrreq,
    192   0,		0,		0,		0,
    193 },
    194 };
    195 
    196 struct domain hydomain =
    197     { AF_HYLINK, "hy", 0, 0, 0, hysw, &hysw[sizeof (hysw)/sizeof(hysw[0])] };
    198 #endif
    199 #endif
    200 
    201 
    202 #define	TCP_SYN_HASH_SIZE	293
    203 #define	TCP_SYN_BUCKET_SIZE	35
    204 
    205 int	tcp_syn_cache_size = TCP_SYN_HASH_SIZE;
    206 int	tcp_syn_cache_limit = TCP_SYN_HASH_SIZE*TCP_SYN_BUCKET_SIZE;
    207 int	tcp_syn_bucket_limit = 3*TCP_SYN_BUCKET_SIZE;
    208 struct	syn_cache_head tcp_syn_cache[TCP_SYN_HASH_SIZE];
    209 struct	syn_cache_head *tcp_syn_cache_first;
    210 int	tcp_syn_cache_interval = 8;	/* runs timer every 4 seconds */
    211 int	tcp_syn_cache_timeo = TCPTV_KEEP_INIT;
    212