The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_proto.c

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    1 /*
    2  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)in_proto.c  8.2 (Berkeley) 2/9/95
   30  * $FreeBSD: src/sys/netinet/in_proto.c,v 1.53.2.7 2003/08/24 08:24:38 hsu Exp $
   31  */
   32 
   33 #include "opt_ipdivert.h"
   34 #include "opt_ipx.h"
   35 #include "opt_mrouting.h"
   36 #include "opt_ipsec.h"
   37 #include "opt_inet6.h"
   38 #include "opt_sctp.h"
   39 #include "opt_carp.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/kernel.h>
   43 #include <sys/socket.h>
   44 #include <sys/domain.h>
   45 #include <sys/protosw.h>
   46 #include <sys/queue.h>
   47 #include <sys/sysctl.h>
   48 
   49 #include <net/if.h>
   50 #include <net/route.h>
   51 
   52 #include <netinet/in.h>
   53 #include <netinet/in_systm.h>
   54 #include <netinet/ip.h>
   55 #include <netinet/ip_var.h>
   56 #include <netinet/ip_icmp.h>
   57 #include <netinet/igmp_var.h>
   58 #ifdef PIM
   59 #include <netinet/pim_var.h>
   60 #endif
   61 #include <netinet/tcp.h>
   62 #include <netinet/tcp_timer.h>
   63 #include <netinet/tcp_var.h>
   64 #include <netinet/udp.h>
   65 #include <netinet/udp_var.h>
   66 #include <netinet/ip_encap.h>
   67 #ifdef IPDIVERT
   68 #include <netinet/ip_divert.h>
   69 #endif
   70 
   71 /*
   72  * TCP/IP protocol family: IP, ICMP, UDP, TCP.
   73  */
   74 
   75 #ifdef IPSEC
   76 #include <netinet6/ipsec.h>
   77 #include <netinet6/ah.h>
   78 #ifdef IPSEC_ESP
   79 #include <netinet6/esp.h>
   80 #endif
   81 #include <netinet6/ipcomp.h>
   82 #endif /* IPSEC */
   83 
   84 #ifdef FAST_IPSEC
   85 #include <netproto/ipsec/ipsec.h>
   86 #endif /* FAST_IPSEC */
   87 
   88 #ifdef IPXIP
   89 #include <netproto/ipx/ipx_ip.h>
   90 #endif
   91 
   92 #ifdef SCTP
   93 #include <netinet/in_pcb.h>
   94 #include <netinet/sctp_pcb.h>
   95 #include <netinet/sctp.h>
   96 #include <netinet/sctp_var.h>
   97 #endif /* SCTP */
   98 
   99 #include <net/netisr.h>         /* for cpu0_soport */
  100 
  101 #ifdef CARP
  102 #include <netinet/ip_carp.h>
  103 #endif
  104 
  105 extern  struct domain inetdomain;
  106 static  struct pr_usrreqs nousrreqs;
  107 
  108 struct protosw inetsw[] = {
  109     {
  110         .pr_type = 0,
  111         .pr_domain = &inetdomain,
  112         .pr_protocol = 0,
  113         .pr_flags = 0,
  114 
  115         .pr_ctlport = NULL,
  116 
  117         .pr_init = ip_init,
  118         .pr_fasttimo = NULL,
  119         .pr_slowtimo = ip_slowtimo,
  120         .pr_drain = ip_drain,
  121         .pr_usrreqs = &nousrreqs
  122     },
  123     {
  124         .pr_type = SOCK_DGRAM,
  125         .pr_domain = &inetdomain,
  126         .pr_protocol = IPPROTO_UDP,
  127         .pr_flags = PR_ATOMIC|PR_ADDR|PR_MPSAFE|
  128             PR_ASYNC_SEND|PR_ASEND_HOLDTD,
  129 
  130         .pr_input = udp_input,
  131         .pr_output = NULL,
  132         .pr_ctlinput = udp_ctlinput,
  133         .pr_ctloutput = ip_ctloutput,
  134 
  135         .pr_ctlport = udp_ctlport,
  136         .pr_init = udp_init,
  137         .pr_usrreqs = &udp_usrreqs
  138     },
  139     {
  140         .pr_type = SOCK_STREAM,
  141         .pr_domain = &inetdomain,
  142         .pr_protocol = IPPROTO_TCP,
  143         .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_MPSAFE|
  144             PR_ASYNC_SEND|PR_ASYNC_RCVD|PR_ACONN_HOLDTD|
  145             PR_RAND_INITPORT,
  146 
  147         .pr_input = tcp_input,
  148         .pr_output = NULL,
  149         .pr_ctlinput = tcp_ctlinput,
  150         .pr_ctloutput = tcp_ctloutput,
  151 
  152         .pr_ctlport = tcp_ctlport,
  153         .pr_init = tcp_init,
  154         .pr_fasttimo = NULL,
  155         .pr_slowtimo = NULL,
  156         .pr_drain = tcp_drain,
  157         .pr_usrreqs = &tcp_usrreqs
  158     },
  159 #ifdef SCTP
  160     /*
  161      * Order is very important here, we add the good one in
  162      * in this postion so it maps to the right ip_protox[]
  163      * postion for SCTP. Don't move the one above below
  164      * this one or IPv6/4 compatability will break
  165      */
  166     {
  167         .pr_type = SOCK_DGRAM,
  168         .pr_domain = &inetdomain,
  169         .pr_protocol = IPPROTO_SCTP,
  170         .pr_flags = PR_ADDR_OPT|PR_WANTRCVD,
  171 
  172         .pr_input = sctp_input,
  173         .pr_output = NULL,
  174         .pr_ctlinput = sctp_ctlinput,
  175         .pr_ctloutput = sctp_ctloutput,
  176 
  177         .pr_ctlport = cpu0_ctlport,
  178         .pr_init = sctp_init,
  179         .pr_drain = sctp_drain,
  180         .pr_usrreqs = &sctp_usrreqs
  181     },
  182     {
  183         .pr_type = SOCK_SEQPACKET,
  184         .pr_domain = &inetdomain,
  185         .pr_protocol = IPPROTO_SCTP,
  186         .pr_flags = PR_ADDR_OPT|PR_WANTRCVD,
  187 
  188         .pr_input = sctp_input,
  189         .pr_output = NULL,
  190         .pr_ctlinput = sctp_ctlinput,
  191         .pr_ctloutput = sctp_ctloutput,
  192 
  193         .pr_ctlport = cpu0_ctlport,
  194         .pr_drain = sctp_drain,
  195         .pr_usrreqs = &sctp_usrreqs
  196     },
  197 
  198     {
  199         .pr_type = SOCK_STREAM,
  200         .pr_domain = &inetdomain,
  201         .pr_protocol = IPPROTO_SCTP,
  202         .pr_flags = PR_CONNREQUIRED|PR_ADDR_OPT|PR_WANTRCVD,
  203 
  204         .pr_input = sctp_input,
  205         .pr_output = NULL,
  206         .pr_ctlinput = sctp_ctlinput,
  207         .pr_ctloutput = sctp_ctloutput,
  208 
  209         .pr_ctlport = cpu0_ctlport,
  210         .pr_drain = sctp_drain,
  211         .pr_usrreqs = &sctp_usrreqs
  212     },
  213 #endif /* SCTP */
  214     {
  215         .pr_type = SOCK_RAW,
  216         .pr_domain = &inetdomain,
  217         .pr_protocol = IPPROTO_RAW,
  218         .pr_flags = PR_ATOMIC|PR_ADDR,
  219 
  220         .pr_input = rip_input,
  221         .pr_output = NULL,
  222         .pr_ctlinput = rip_ctlinput,
  223         .pr_ctloutput = rip_ctloutput,
  224 
  225         .pr_ctlport = cpu0_ctlport,
  226         .pr_usrreqs = &rip_usrreqs
  227     },
  228     {
  229         .pr_type = SOCK_RAW,
  230         .pr_domain = &inetdomain,
  231         .pr_protocol = IPPROTO_ICMP,
  232         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR|PR_MPSAFE,
  233 
  234         .pr_input = icmp_input,
  235         .pr_output = NULL,
  236         .pr_ctlinput = NULL,
  237         .pr_ctloutput = rip_ctloutput,
  238 
  239         .pr_usrreqs = &rip_usrreqs
  240     },
  241     {
  242         .pr_type = SOCK_RAW,
  243         .pr_domain = &inetdomain,
  244         .pr_protocol = IPPROTO_IGMP,
  245         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  246 
  247         .pr_input = igmp_input,
  248         .pr_output = NULL,
  249         .pr_ctlinput = NULL,
  250         .pr_ctloutput = rip_ctloutput,
  251 
  252         .pr_init = igmp_init,
  253         .pr_fasttimo = igmp_fasttimo,
  254         .pr_slowtimo = igmp_slowtimo,
  255         .pr_drain = NULL,
  256         .pr_usrreqs = &rip_usrreqs
  257     },
  258     {
  259         .pr_type = SOCK_RAW,
  260         .pr_domain = &inetdomain,
  261         .pr_protocol = IPPROTO_RSVP,
  262         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  263 
  264         .pr_input = rsvp_input,
  265         .pr_output = NULL,
  266         .pr_ctlinput = NULL,
  267         .pr_ctloutput = rip_ctloutput,
  268 
  269         .pr_usrreqs = &rip_usrreqs
  270     },
  271 #ifdef IPSEC
  272     {
  273         .pr_type = SOCK_RAW,
  274         .pr_domain = &inetdomain,
  275         .pr_protocol = IPPROTO_AH,
  276         .pr_flags = PR_ATOMIC|PR_ADDR,
  277 
  278         .pr_input = ah4_input,
  279         .pr_output = NULL,
  280         .pr_ctlinput = NULL,
  281         .pr_ctloutput = NULL,
  282 
  283         .pr_ctlport = NULL,
  284         .pr_usrreqs = &nousrreqs
  285     },
  286 #ifdef IPSEC_ESP
  287     {
  288         .pr_type = SOCK_RAW,
  289         .pr_domain = &inetdomain,
  290         .pr_protocol = IPPROTO_ESP,
  291         .pr_flags = PR_ATOMIC|PR_ADDR,
  292 
  293         .pr_input = esp4_input,
  294         .pr_output = NULL,
  295         .pr_ctlinput = NULL,
  296         .pr_ctloutput = NULL,
  297 
  298         .pr_ctlport = NULL,
  299         .pr_usrreqs = &nousrreqs
  300     },
  301 #endif
  302     {
  303         .pr_type = SOCK_RAW,
  304         .pr_domain = &inetdomain,
  305         .pr_protocol = IPPROTO_IPCOMP,
  306         .pr_flags = PR_ATOMIC|PR_ADDR,
  307 
  308         .pr_input = ipcomp4_input,
  309         .pr_output = 0,
  310         .pr_ctlinput = NULL,
  311         .pr_ctloutput = NULL,
  312 
  313         .pr_ctlport = NULL,
  314         .pr_usrreqs = &nousrreqs
  315     },
  316 #endif /* IPSEC */
  317 #ifdef FAST_IPSEC
  318     {
  319         .pr_type = SOCK_RAW,
  320         .pr_domain = &inetdomain,
  321         .pr_protocol = IPPROTO_AH,
  322         .pr_flags = PR_ATOMIC|PR_ADDR,
  323 
  324         .pr_input = ipsec4_common_input,
  325         .pr_output = NULL,
  326         .pr_ctlinput = NULL,
  327         .pr_ctloutput = NULL,
  328 
  329         .pr_ctlport = NULL,
  330         .pr_usrreqs = &nousrreqs
  331     },
  332     {
  333         .pr_type = SOCK_RAW,
  334         .pr_domain = &inetdomain,
  335         .pr_protocol = IPPROTO_ESP,
  336         .pr_flags = PR_ATOMIC|PR_ADDR,
  337 
  338         .pr_input = ipsec4_common_input,
  339         .pr_output = NULL,
  340         .pr_ctlinput = NULL,
  341         .pr_ctloutput = NULL,
  342 
  343         .pr_ctlport = NULL,
  344         .pr_usrreqs = &nousrreqs
  345     },
  346     {
  347         .pr_type = SOCK_RAW,
  348         .pr_domain = &inetdomain,
  349         .pr_protocol = IPPROTO_IPCOMP,
  350         .pr_flags = PR_ATOMIC|PR_ADDR,
  351 
  352         .pr_input = ipsec4_common_input,
  353         .pr_output = NULL,
  354         .pr_ctlinput = NULL,
  355         .pr_ctloutput = NULL,
  356 
  357         .pr_ctlport = NULL,
  358         .pr_usrreqs = &nousrreqs
  359     },
  360 #endif /* FAST_IPSEC */
  361     {
  362         .pr_type = SOCK_RAW,
  363         .pr_domain = &inetdomain,
  364         .pr_protocol = IPPROTO_IPV4,
  365         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  366         .pr_input = encap4_input,
  367         .pr_output = NULL,
  368         .pr_ctlinput = NULL,
  369         .pr_ctloutput = rip_ctloutput,
  370 
  371         .pr_ctlport = NULL,
  372         .pr_init = encap_init,
  373         .pr_usrreqs = &rip_usrreqs
  374     },
  375     {
  376         .pr_type = SOCK_RAW,
  377         .pr_domain = &inetdomain,
  378         .pr_protocol = IPPROTO_MOBILE,
  379         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  380 
  381         .pr_input = encap4_input,
  382         .pr_output = NULL,
  383         .pr_ctlinput = NULL,
  384         .pr_ctloutput = rip_ctloutput,
  385 
  386         .pr_ctlport = NULL,
  387         .pr_init = encap_init,
  388         .pr_usrreqs = &rip_usrreqs
  389     },
  390     {
  391         .pr_type = SOCK_RAW,
  392         .pr_domain = &inetdomain,
  393         .pr_protocol = IPPROTO_GRE,
  394         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  395 
  396         .pr_input = encap4_input,
  397         .pr_output = NULL,
  398         .pr_ctlinput = NULL,
  399         .pr_ctloutput = rip_ctloutput,
  400 
  401         .pr_ctlport = NULL,
  402         .pr_init = encap_init,
  403         .pr_usrreqs = &rip_usrreqs
  404     },
  405 #ifdef INET6
  406     {
  407         .pr_type = SOCK_RAW,
  408         .pr_domain = &inetdomain,
  409         .pr_protocol = IPPROTO_IPV6,
  410         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  411 
  412         .pr_input = encap4_input,
  413         .pr_output = NULL,
  414         .pr_ctlinput = NULL,
  415         .pr_ctloutput = rip_ctloutput,
  416 
  417         .pr_ctlport = NULL,
  418         .pr_init = encap_init,
  419         .pr_usrreqs = &rip_usrreqs
  420     },
  421 #endif
  422 #ifdef IPDIVERT
  423     {
  424         .pr_type = SOCK_RAW,
  425         .pr_domain = &inetdomain,
  426         .pr_protocol = IPPROTO_DIVERT,
  427         .pr_flags = PR_ATOMIC|PR_ADDR,
  428 
  429         .pr_input = div_input,
  430         .pr_output = NULL,
  431         .pr_ctlinput = NULL,
  432         .pr_ctloutput = ip_ctloutput,
  433 
  434         .pr_ctlport = NULL,
  435         .pr_init = div_init,
  436         .pr_usrreqs = &div_usrreqs
  437     },
  438 #endif
  439 #ifdef IPXIP
  440     {
  441         .pr_type = SOCK_RAW,
  442         .pr_domain = &inetdomain,
  443         .pr_protocol = IPPROTO_IDP,
  444         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  445 
  446         .pr_input = ipxip_input,
  447         .pr_output = NULL,
  448         .pr_ctlinput = ipxip_ctlinput,
  449         .pr_ctloutput = NULL,
  450 
  451         .pr_ctlport = cpu0_ctlport,
  452         .pr_usrreqs = &rip_usrreqs
  453     },
  454 #endif
  455 #ifdef PIM
  456     {
  457         .pr_type = SOCK_RAW,
  458         .pr_domain = &inetdomain,
  459         .pr_protocol = IPPROTO_PIM,
  460         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  461 
  462         .pr_input = pim_input,
  463         .pr_output = NULL,
  464         .pr_ctlinput = NULL,
  465         .pr_ctloutput = rip_ctloutput,
  466 
  467         .pr_ctlport = NULL,
  468         .pr_usrreqs = &rip_usrreqs
  469     },
  470 #endif
  471 #ifdef NPFSYNC
  472     {
  473         .pr_type = SOCK_RAW,
  474         .pr_domain = &inetdomain,
  475         .pr_protocol = IPPROTO_PFSYNC,
  476         .pr_flags = PR_ATOMIC|PR_ADDR,
  477 
  478         .pr_input = pfsync_input,
  479         .pr_output = NULL,
  480         .pr_ctlinput = NULL,
  481         .pr_ctloutput = rip_ctloutput,
  482 
  483         .pr_ctlport = NULL,
  484         .pr_usrreqs = &rip_usrreqs
  485     },
  486 #endif  /* NPFSYNC */
  487     {
  488         /* raw wildcard */
  489         .pr_type = SOCK_RAW,
  490         .pr_domain = &inetdomain,
  491         .pr_protocol = 0,
  492         .pr_flags = PR_ATOMIC|PR_ADDR,
  493 
  494         .pr_input = rip_input,
  495         .pr_output = NULL,
  496         .pr_ctlinput = NULL,
  497         .pr_ctloutput = rip_ctloutput,
  498 
  499         .pr_init = rip_init,
  500         .pr_ctlport = NULL,
  501         .pr_usrreqs = &rip_usrreqs
  502     },
  503 #ifdef CARP
  504     {
  505         .pr_type = SOCK_RAW,
  506         .pr_domain = &inetdomain,
  507         .pr_protocol = IPPROTO_CARP,
  508         .pr_flags = PR_ATOMIC|PR_ADDR|PR_MPSAFE,
  509 
  510         .pr_input = carp_proto_input,
  511         .pr_output = rip_output,
  512         .pr_ctlinput = carp_proto_ctlinput,
  513         .pr_ctloutput = rip_ctloutput,
  514 
  515         .pr_ctlport = cpu0_ctlport,
  516         .pr_usrreqs = &rip_usrreqs
  517     },
  518 #endif
  519 };
  520 
  521 struct domain inetdomain = {
  522         AF_INET, "internet", NULL, NULL, NULL,
  523         inetsw, &inetsw[NELEM(inetsw)],
  524         SLIST_ENTRY_INITIALIZER,
  525         in_inithead, 32, sizeof(struct sockaddr_in),
  526 };
  527 
  528 DOMAIN_SET(inet);
  529 
  530 SYSCTL_NODE(_net,      PF_INET,         inet,   CTLFLAG_RW, 0,
  531         "Internet Family");
  532 
  533 SYSCTL_NODE(_net_inet, IPPROTO_IP,      ip,     CTLFLAG_RW, 0,  "IP");
  534 SYSCTL_NODE(_net_inet, IPPROTO_ICMP,    icmp,   CTLFLAG_RW, 0,  "ICMP");
  535 SYSCTL_NODE(_net_inet, IPPROTO_UDP,     udp,    CTLFLAG_RW, 0,  "UDP");
  536 SYSCTL_NODE(_net_inet, IPPROTO_TCP,     tcp,    CTLFLAG_RW, 0,  "TCP");
  537 SYSCTL_NODE(_net_inet, IPPROTO_IGMP,    igmp,   CTLFLAG_RW, 0,  "IGMP");
  538 #ifdef FAST_IPSEC
  539 /* XXX no protocol # to use, pick something "reserved" */
  540 SYSCTL_NODE(_net_inet, 253,             ipsec,  CTLFLAG_RW, 0,  "IPSEC");
  541 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ah,     CTLFLAG_RW, 0,  "AH");
  542 SYSCTL_NODE(_net_inet, IPPROTO_ESP,     esp,    CTLFLAG_RW, 0,  "ESP");
  543 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP,  ipcomp, CTLFLAG_RW, 0,  "IPCOMP");
  544 SYSCTL_NODE(_net_inet, IPPROTO_IPIP,    ipip,   CTLFLAG_RW, 0,  "IPIP");
  545 #else
  546 #ifdef IPSEC
  547 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ipsec,  CTLFLAG_RW, 0,  "IPSEC");
  548 #endif /* IPSEC */
  549 #endif /* !FAST_IPSEC */
  550 SYSCTL_NODE(_net_inet, IPPROTO_RAW,     raw,    CTLFLAG_RW, 0,  "RAW");
  551 #ifdef IPDIVERT
  552 SYSCTL_NODE(_net_inet, IPPROTO_DIVERT,  divert, CTLFLAG_RW, 0,  "DIVERT");
  553 #endif
  554 #ifdef PIM
  555 SYSCTL_NODE(_net_inet, IPPROTO_PIM,    pim,    CTLFLAG_RW, 0,  "PIM");
  556 #endif
  557 #ifdef CARP
  558 SYSCTL_NODE(_net_inet, IPPROTO_CARP,    carp,    CTLFLAG_RW, 0,  "CARP");
  559 #endif

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