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  * 4. 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: releng/6.4/sys/netinet/in_proto.c 153984 2006-01-03 08:15:33Z thompsa $
   31  */
   32 
   33 #include "opt_ipx.h"
   34 #include "opt_mrouting.h"
   35 #include "opt_ipsec.h"
   36 #include "opt_inet6.h"
   37 #include "opt_pf.h"
   38 #include "opt_carp.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.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 
   68 /*
   69  * TCP/IP protocol family: IP, ICMP, UDP, TCP.
   70  */
   71 
   72 #ifdef IPSEC
   73 #include <netinet6/ipsec.h>
   74 #include <netinet6/ah.h>
   75 #ifdef IPSEC_ESP
   76 #include <netinet6/esp.h>
   77 #endif
   78 #include <netinet6/ipcomp.h>
   79 #endif /* IPSEC */
   80 
   81 #ifdef FAST_IPSEC
   82 #include <netipsec/ipsec.h>
   83 #endif /* FAST_IPSEC */
   84 
   85 #ifdef IPXIP
   86 #include <netipx/ipx_ip.h>
   87 #endif
   88 
   89 #ifdef DEV_PFSYNC
   90 #include <net/pfvar.h>
   91 #include <net/if_pfsync.h>
   92 #endif
   93 
   94 #ifdef DEV_CARP
   95 #include <netinet/ip_carp.h>
   96 #endif
   97 
   98 extern  struct domain inetdomain;
   99 
  100 /* Spacer for loadable protocols. */
  101 #define IPPROTOSPACER                           \
  102 {                                               \
  103         .pr_domain =            &inetdomain,    \
  104         .pr_protocol =          PROTO_SPACER,   \
  105         .pr_usrreqs =           &nousrreqs      \
  106 }
  107 
  108 struct protosw inetsw[] = {
  109 {
  110         .pr_type =              0,
  111         .pr_domain =            &inetdomain,
  112         .pr_protocol =          IPPROTO_IP,
  113         .pr_init =              ip_init,
  114         .pr_slowtimo =          ip_slowtimo,
  115         .pr_drain =             ip_drain,
  116         .pr_usrreqs =           &nousrreqs
  117 },
  118 {
  119         .pr_type =              SOCK_DGRAM,
  120         .pr_domain =            &inetdomain,
  121         .pr_protocol =          IPPROTO_UDP,
  122         .pr_flags =             PR_ATOMIC|PR_ADDR,
  123         .pr_input =             udp_input,
  124         .pr_ctlinput =          udp_ctlinput,
  125         .pr_ctloutput =         ip_ctloutput,
  126         .pr_init =              udp_init,
  127         .pr_usrreqs =           &udp_usrreqs
  128 },
  129 {
  130         .pr_type =              SOCK_STREAM,
  131         .pr_domain =            &inetdomain,
  132         .pr_protocol =          IPPROTO_TCP,
  133         .pr_flags =             PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
  134         .pr_input =             tcp_input,
  135         .pr_ctlinput =          tcp_ctlinput,
  136         .pr_ctloutput =         tcp_ctloutput,
  137         .pr_init =              tcp_init,
  138         .pr_slowtimo =          tcp_slowtimo,
  139         .pr_drain =             tcp_drain,
  140         .pr_usrreqs =           &tcp_usrreqs
  141 },
  142 {
  143         .pr_type =              SOCK_RAW,
  144         .pr_domain =            &inetdomain,
  145         .pr_protocol =          IPPROTO_RAW,
  146         .pr_flags =             PR_ATOMIC|PR_ADDR,
  147         .pr_input =             rip_input,
  148         .pr_ctlinput =          rip_ctlinput,
  149         .pr_ctloutput =         rip_ctloutput,
  150         .pr_usrreqs =           &rip_usrreqs
  151 },
  152 {
  153         .pr_type =              SOCK_RAW,
  154         .pr_domain =            &inetdomain,
  155         .pr_protocol =          IPPROTO_ICMP,
  156         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  157         .pr_input =             icmp_input,
  158         .pr_ctloutput =         rip_ctloutput,
  159         .pr_usrreqs =           &rip_usrreqs
  160 },
  161 {
  162         .pr_type =              SOCK_RAW,
  163         .pr_domain =            &inetdomain,
  164         .pr_protocol =          IPPROTO_IGMP,
  165         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  166         .pr_input =             igmp_input,
  167         .pr_ctloutput =         rip_ctloutput,
  168         .pr_init =              igmp_init,
  169         .pr_fasttimo =          igmp_fasttimo,
  170         .pr_slowtimo =          igmp_slowtimo,
  171         .pr_usrreqs =           &rip_usrreqs
  172 },
  173 {
  174         .pr_type =              SOCK_RAW,
  175         .pr_domain =            &inetdomain,
  176         .pr_protocol =          IPPROTO_RSVP,
  177         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  178         .pr_input =             rsvp_input,
  179         .pr_ctloutput =         rip_ctloutput,
  180         .pr_usrreqs =           &rip_usrreqs
  181 },
  182 #ifdef IPSEC
  183 {
  184         .pr_type =              SOCK_RAW,
  185         .pr_domain =            &inetdomain,
  186         .pr_protocol =          IPPROTO_AH,
  187         .pr_flags =             PR_ATOMIC|PR_ADDR,
  188         .pr_input =             ah4_input,
  189         .pr_usrreqs =           &nousrreqs
  190 },
  191 #ifdef IPSEC_ESP
  192 {
  193         .pr_type =              SOCK_RAW,
  194         .pr_domain =            &inetdomain,
  195         .pr_protocol =          IPPROTO_ESP,
  196         .pr_flags =             PR_ATOMIC|PR_ADDR,
  197         .pr_input =             esp4_input,
  198         .pr_usrreqs =           &nousrreqs
  199 },
  200 #endif
  201 {
  202         .pr_type =              SOCK_RAW,
  203         .pr_domain =            &inetdomain,
  204         .pr_protocol =          IPPROTO_IPCOMP,
  205         .pr_flags =             PR_ATOMIC|PR_ADDR,
  206         .pr_input =             ipcomp4_input,
  207         .pr_usrreqs =           &nousrreqs
  208 },
  209 #endif /* IPSEC */
  210 #ifdef FAST_IPSEC
  211 {
  212         .pr_type =              SOCK_RAW,
  213         .pr_domain =            &inetdomain,
  214         .pr_protocol =          IPPROTO_AH,
  215         .pr_flags =             PR_ATOMIC|PR_ADDR,
  216         .pr_input =             ah4_input,
  217         .pr_ctlinput =          ah4_ctlinput,
  218         .pr_usrreqs =           &nousrreqs
  219 },
  220 {
  221         .pr_type =              SOCK_RAW,
  222         .pr_domain =            &inetdomain,
  223         .pr_protocol =          IPPROTO_ESP,
  224         .pr_flags =             PR_ATOMIC|PR_ADDR,
  225         .pr_input =             esp4_input,
  226         .pr_ctlinput =          esp4_ctlinput,
  227         .pr_usrreqs =           &nousrreqs
  228 },
  229 {
  230         .pr_type =              SOCK_RAW,
  231         .pr_domain =            &inetdomain,
  232         .pr_protocol =          IPPROTO_IPCOMP,
  233         .pr_flags =             PR_ATOMIC|PR_ADDR,
  234         .pr_input =             ipcomp4_input,
  235         .pr_usrreqs =           &nousrreqs
  236 },
  237 #endif /* FAST_IPSEC */
  238 {
  239         .pr_type =              SOCK_RAW,
  240         .pr_domain =            &inetdomain,
  241         .pr_protocol =          IPPROTO_IPV4,
  242         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  243         .pr_input =             encap4_input,
  244         .pr_ctloutput =         rip_ctloutput,
  245         .pr_init =              encap_init,
  246         .pr_usrreqs =           &rip_usrreqs
  247 },
  248 {
  249         .pr_type =              SOCK_RAW,
  250         .pr_domain =            &inetdomain,
  251         .pr_protocol =          IPPROTO_MOBILE,
  252         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  253         .pr_input =             encap4_input,
  254         .pr_ctloutput =         rip_ctloutput,
  255         .pr_init =              encap_init,
  256         .pr_usrreqs =           &rip_usrreqs
  257 },
  258 {
  259         .pr_type =              SOCK_RAW,
  260         .pr_domain =            &inetdomain,
  261         .pr_protocol =          IPPROTO_ETHERIP,
  262         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  263         .pr_input =             encap4_input,
  264         .pr_ctloutput =         rip_ctloutput,
  265         .pr_init =              encap_init,
  266         .pr_usrreqs =           &rip_usrreqs
  267 },
  268 {
  269         .pr_type =              SOCK_RAW,
  270         .pr_domain =            &inetdomain,
  271         .pr_protocol =          IPPROTO_GRE,
  272         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  273         .pr_input =             encap4_input,
  274         .pr_ctloutput =         rip_ctloutput,
  275         .pr_init =              encap_init,
  276         .pr_usrreqs =           &rip_usrreqs
  277 },
  278 # ifdef INET6
  279 {
  280         .pr_type =              SOCK_RAW,
  281         .pr_domain =            &inetdomain,
  282         .pr_protocol =          IPPROTO_IPV6,
  283         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  284         .pr_input =             encap4_input,
  285         .pr_ctloutput =         rip_ctloutput,
  286         .pr_init =              encap_init,
  287         .pr_usrreqs =           &rip_usrreqs
  288 },
  289 #endif
  290 #ifdef IPXIP
  291 {
  292         .pr_type =              SOCK_RAW,
  293         .pr_domain =            &inetdomain,
  294         .pr_protocol =          IPPROTO_IDP,
  295         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  296         .pr_input =             ipxip_input,
  297         .pr_ctlinput =          ipxip_ctlinput,
  298         .pr_usrreqs =           &rip_usrreqs
  299 },
  300 #endif
  301 #ifdef PIM
  302 {
  303         .pr_type =              SOCK_RAW,
  304         .pr_domain =            &inetdomain,
  305         .pr_protocol =          IPPROTO_PIM,
  306         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  307         .pr_input =             pim_input,
  308         .pr_ctloutput =         rip_ctloutput,
  309         .pr_usrreqs =           &rip_usrreqs
  310 },
  311 #endif  /* PIM */
  312 #ifdef DEV_PFSYNC
  313 {
  314         .pr_type =              SOCK_RAW,
  315         .pr_domain =            &inetdomain,
  316         .pr_protocol =          IPPROTO_PFSYNC,
  317         .pr_flags =             PR_ATOMIC|PR_ADDR,
  318         .pr_input =             pfsync_input,
  319         .pr_ctloutput =         rip_ctloutput,
  320         .pr_usrreqs =           &rip_usrreqs
  321 },
  322 #endif  /* DEV_PFSYNC */
  323 #ifdef DEV_CARP
  324 {
  325         .pr_type =              SOCK_RAW,
  326         .pr_domain =            &inetdomain,
  327         .pr_protocol =          IPPROTO_CARP,
  328         .pr_flags =             PR_ATOMIC|PR_ADDR,
  329         .pr_input =             carp_input,
  330         .pr_output =            (pr_output_t*)rip_output,
  331         .pr_ctloutput =         rip_ctloutput,
  332         .pr_usrreqs =           &rip_usrreqs
  333 },
  334 #endif /* DEV_CARP */
  335 /* Spacer n-times for loadable protocols. */
  336 IPPROTOSPACER,
  337 IPPROTOSPACER,
  338 IPPROTOSPACER,
  339 IPPROTOSPACER,
  340 IPPROTOSPACER,
  341 IPPROTOSPACER,
  342 IPPROTOSPACER,
  343 IPPROTOSPACER,
  344 /* raw wildcard */
  345 {
  346         .pr_type =              SOCK_RAW,
  347         .pr_domain =            &inetdomain,
  348         .pr_flags =             PR_ATOMIC|PR_ADDR,
  349         .pr_input =             rip_input,
  350         .pr_ctloutput =         rip_ctloutput,
  351         .pr_init =              rip_init,
  352         .pr_usrreqs =           &rip_usrreqs
  353 },
  354 };
  355 
  356 extern int in_inithead(void **, int);
  357 
  358 struct domain inetdomain = {
  359         .dom_family =           AF_INET,
  360         .dom_name =             "internet",
  361         .dom_protosw =          inetsw,
  362         .dom_protoswNPROTOSW =  &inetsw[sizeof(inetsw)/sizeof(inetsw[0])],
  363         .dom_rtattach =         in_inithead,
  364         .dom_rtoffset =         32,
  365         .dom_maxrtkey =         sizeof(struct sockaddr_in)
  366 };
  367 
  368 DOMAIN_SET(inet);
  369 
  370 SYSCTL_NODE(_net,      PF_INET,         inet,   CTLFLAG_RW, 0,
  371         "Internet Family");
  372 
  373 SYSCTL_NODE(_net_inet, IPPROTO_IP,      ip,     CTLFLAG_RW, 0,  "IP");
  374 SYSCTL_NODE(_net_inet, IPPROTO_ICMP,    icmp,   CTLFLAG_RW, 0,  "ICMP");
  375 SYSCTL_NODE(_net_inet, IPPROTO_UDP,     udp,    CTLFLAG_RW, 0,  "UDP");
  376 SYSCTL_NODE(_net_inet, IPPROTO_TCP,     tcp,    CTLFLAG_RW, 0,  "TCP");
  377 SYSCTL_NODE(_net_inet, IPPROTO_IGMP,    igmp,   CTLFLAG_RW, 0,  "IGMP");
  378 #ifdef FAST_IPSEC
  379 /* XXX no protocol # to use, pick something "reserved" */
  380 SYSCTL_NODE(_net_inet, 253,             ipsec,  CTLFLAG_RW, 0,  "IPSEC");
  381 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ah,     CTLFLAG_RW, 0,  "AH");
  382 SYSCTL_NODE(_net_inet, IPPROTO_ESP,     esp,    CTLFLAG_RW, 0,  "ESP");
  383 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP,  ipcomp, CTLFLAG_RW, 0,  "IPCOMP");
  384 SYSCTL_NODE(_net_inet, IPPROTO_IPIP,    ipip,   CTLFLAG_RW, 0,  "IPIP");
  385 #else
  386 #ifdef IPSEC
  387 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ipsec,  CTLFLAG_RW, 0,  "IPSEC");
  388 #endif /* IPSEC */
  389 #endif /* !FAST_IPSEC */
  390 SYSCTL_NODE(_net_inet, IPPROTO_RAW,     raw,    CTLFLAG_RW, 0,  "RAW");
  391 #ifdef PIM
  392 SYSCTL_NODE(_net_inet, IPPROTO_PIM,     pim,    CTLFLAG_RW, 0,  "PIM");
  393 #endif
  394 #ifdef DEV_PFSYNC
  395 SYSCTL_NODE(_net_inet, IPPROTO_PFSYNC,  pfsync, CTLFLAG_RW, 0,  "PFSYNC");
  396 #endif
  397 #ifdef DEV_CARP
  398 SYSCTL_NODE(_net_inet, IPPROTO_CARP,    carp,   CTLFLAG_RW, 0,  "CARP");
  399 #endif

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