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  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/7.4/sys/netinet/in_proto.c 172467 2007-10-07 20:44:24Z silby $");
   34 
   35 #include "opt_ipx.h"
   36 #include "opt_mrouting.h"
   37 #include "opt_ipsec.h"
   38 #include "opt_inet6.h"
   39 #include "opt_pf.h"
   40 #include "opt_carp.h"
   41 #include "opt_sctp.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/kernel.h>
   46 #include <sys/socket.h>
   47 #include <sys/domain.h>
   48 #include <sys/protosw.h>
   49 #include <sys/queue.h>
   50 #include <sys/sysctl.h>
   51 
   52 #include <net/if.h>
   53 #include <net/route.h>
   54 
   55 #include <netinet/in.h>
   56 #include <netinet/in_systm.h>
   57 #include <netinet/ip.h>
   58 #include <netinet/ip_var.h>
   59 #include <netinet/ip_icmp.h>
   60 #include <netinet/igmp_var.h>
   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 static struct pr_usrreqs nousrreqs;
   73 
   74 #ifdef IPSEC
   75 #include <netipsec/ipsec.h>
   76 #endif /* IPSEC */
   77 
   78 #ifdef SCTP
   79 #include <netinet/in_pcb.h>
   80 #include <netinet/sctp_pcb.h>
   81 #include <netinet/sctp.h>
   82 #include <netinet/sctp_var.h>
   83 #endif /* SCTP */
   84 
   85 #ifdef DEV_PFSYNC
   86 #include <net/pfvar.h>
   87 #include <net/if_pfsync.h>
   88 #endif
   89 
   90 #ifdef DEV_CARP
   91 #include <netinet/ip_carp.h>
   92 #endif
   93 
   94 extern  struct domain inetdomain;
   95 
   96 /* Spacer for loadable protocols. */
   97 #define IPPROTOSPACER                           \
   98 {                                               \
   99         .pr_domain =            &inetdomain,    \
  100         .pr_protocol =          PROTO_SPACER,   \
  101         .pr_usrreqs =           &nousrreqs      \
  102 }
  103 
  104 struct protosw inetsw[] = {
  105 {
  106         .pr_type =              0,
  107         .pr_domain =            &inetdomain,
  108         .pr_protocol =          IPPROTO_IP,
  109         .pr_init =              ip_init,
  110         .pr_slowtimo =          ip_slowtimo,
  111         .pr_drain =             ip_drain,
  112         .pr_usrreqs =           &nousrreqs
  113 },
  114 {
  115         .pr_type =              SOCK_DGRAM,
  116         .pr_domain =            &inetdomain,
  117         .pr_protocol =          IPPROTO_UDP,
  118         .pr_flags =             PR_ATOMIC|PR_ADDR,
  119         .pr_input =             udp_input,
  120         .pr_ctlinput =          udp_ctlinput,
  121         .pr_ctloutput =         ip_ctloutput,
  122         .pr_init =              udp_init,
  123         .pr_usrreqs =           &udp_usrreqs
  124 },
  125 {
  126         .pr_type =              SOCK_STREAM,
  127         .pr_domain =            &inetdomain,
  128         .pr_protocol =          IPPROTO_TCP,
  129         .pr_flags =             PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
  130         .pr_input =             tcp_input,
  131         .pr_ctlinput =          tcp_ctlinput,
  132         .pr_ctloutput =         tcp_ctloutput,
  133         .pr_init =              tcp_init,
  134         .pr_slowtimo =          tcp_slowtimo,
  135         .pr_drain =             tcp_drain,
  136         .pr_usrreqs =           &tcp_usrreqs
  137 },
  138 #ifdef SCTP
  139 { 
  140         .pr_type =      SOCK_DGRAM,
  141         .pr_domain =    &inetdomain,
  142         .pr_protocol =  IPPROTO_SCTP,
  143         .pr_flags =     PR_WANTRCVD,
  144         .pr_input =     sctp_input,
  145         .pr_ctlinput =  sctp_ctlinput,  
  146         .pr_ctloutput = sctp_ctloutput,
  147         .pr_init =      sctp_init,      
  148         .pr_drain =     sctp_drain,
  149         .pr_usrreqs =   &sctp_usrreqs
  150 },
  151 {
  152         .pr_type =      SOCK_SEQPACKET,
  153         .pr_domain =    &inetdomain,
  154         .pr_protocol =  IPPROTO_SCTP,
  155         .pr_flags =     PR_WANTRCVD,
  156         .pr_input =     sctp_input,
  157         .pr_ctlinput =  sctp_ctlinput,  
  158         .pr_ctloutput = sctp_ctloutput,
  159         .pr_drain =     sctp_drain,
  160         .pr_usrreqs =   &sctp_usrreqs
  161 },
  162 
  163 { 
  164         .pr_type =      SOCK_STREAM,
  165         .pr_domain =    &inetdomain,
  166         .pr_protocol =  IPPROTO_SCTP,
  167         .pr_flags =     PR_WANTRCVD,
  168         .pr_input =     sctp_input,
  169         .pr_ctlinput =  sctp_ctlinput,  
  170         .pr_ctloutput = sctp_ctloutput,
  171         .pr_drain =     sctp_drain,
  172         .pr_usrreqs =   &sctp_usrreqs
  173 },
  174 #endif /* SCTP */
  175 {
  176         .pr_type =              SOCK_RAW,
  177         .pr_domain =            &inetdomain,
  178         .pr_protocol =          IPPROTO_RAW,
  179         .pr_flags =             PR_ATOMIC|PR_ADDR,
  180         .pr_input =             rip_input,
  181         .pr_ctlinput =          rip_ctlinput,
  182         .pr_ctloutput =         rip_ctloutput,
  183         .pr_usrreqs =           &rip_usrreqs
  184 },
  185 {
  186         .pr_type =              SOCK_RAW,
  187         .pr_domain =            &inetdomain,
  188         .pr_protocol =          IPPROTO_ICMP,
  189         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  190         .pr_input =             icmp_input,
  191         .pr_ctloutput =         rip_ctloutput,
  192         .pr_usrreqs =           &rip_usrreqs
  193 },
  194 {
  195         .pr_type =              SOCK_RAW,
  196         .pr_domain =            &inetdomain,
  197         .pr_protocol =          IPPROTO_IGMP,
  198         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  199         .pr_input =             igmp_input,
  200         .pr_ctloutput =         rip_ctloutput,
  201         .pr_init =              igmp_init,
  202         .pr_fasttimo =          igmp_fasttimo,
  203         .pr_slowtimo =          igmp_slowtimo,
  204         .pr_usrreqs =           &rip_usrreqs
  205 },
  206 {
  207         .pr_type =              SOCK_RAW,
  208         .pr_domain =            &inetdomain,
  209         .pr_protocol =          IPPROTO_RSVP,
  210         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  211         .pr_input =             rsvp_input,
  212         .pr_ctloutput =         rip_ctloutput,
  213         .pr_usrreqs =           &rip_usrreqs
  214 },
  215 #ifdef IPSEC
  216 {
  217         .pr_type =              SOCK_RAW,
  218         .pr_domain =            &inetdomain,
  219         .pr_protocol =          IPPROTO_AH,
  220         .pr_flags =             PR_ATOMIC|PR_ADDR,
  221         .pr_input =             ah4_input,
  222         .pr_ctlinput =          ah4_ctlinput,
  223         .pr_usrreqs =           &nousrreqs
  224 },
  225 {
  226         .pr_type =              SOCK_RAW,
  227         .pr_domain =            &inetdomain,
  228         .pr_protocol =          IPPROTO_ESP,
  229         .pr_flags =             PR_ATOMIC|PR_ADDR,
  230         .pr_input =             esp4_input,
  231         .pr_ctlinput =          esp4_ctlinput,
  232         .pr_usrreqs =           &nousrreqs
  233 },
  234 {
  235         .pr_type =              SOCK_RAW,
  236         .pr_domain =            &inetdomain,
  237         .pr_protocol =          IPPROTO_IPCOMP,
  238         .pr_flags =             PR_ATOMIC|PR_ADDR,
  239         .pr_input =             ipcomp4_input,
  240         .pr_usrreqs =           &nousrreqs
  241 },
  242 #endif /* IPSEC */
  243 {
  244         .pr_type =              SOCK_RAW,
  245         .pr_domain =            &inetdomain,
  246         .pr_protocol =          IPPROTO_IPV4,
  247         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  248         .pr_input =             encap4_input,
  249         .pr_ctloutput =         rip_ctloutput,
  250         .pr_init =              encap_init,
  251         .pr_usrreqs =           &rip_usrreqs
  252 },
  253 {
  254         .pr_type =              SOCK_RAW,
  255         .pr_domain =            &inetdomain,
  256         .pr_protocol =          IPPROTO_MOBILE,
  257         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  258         .pr_input =             encap4_input,
  259         .pr_ctloutput =         rip_ctloutput,
  260         .pr_init =              encap_init,
  261         .pr_usrreqs =           &rip_usrreqs
  262 },
  263 {
  264         .pr_type =              SOCK_RAW,
  265         .pr_domain =            &inetdomain,
  266         .pr_protocol =          IPPROTO_ETHERIP,
  267         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  268         .pr_input =             encap4_input,
  269         .pr_ctloutput =         rip_ctloutput,
  270         .pr_init =              encap_init,
  271         .pr_usrreqs =           &rip_usrreqs
  272 },
  273 {
  274         .pr_type =              SOCK_RAW,
  275         .pr_domain =            &inetdomain,
  276         .pr_protocol =          IPPROTO_GRE,
  277         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  278         .pr_input =             encap4_input,
  279         .pr_ctloutput =         rip_ctloutput,
  280         .pr_init =              encap_init,
  281         .pr_usrreqs =           &rip_usrreqs
  282 },
  283 # ifdef INET6
  284 {
  285         .pr_type =              SOCK_RAW,
  286         .pr_domain =            &inetdomain,
  287         .pr_protocol =          IPPROTO_IPV6,
  288         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  289         .pr_input =             encap4_input,
  290         .pr_ctloutput =         rip_ctloutput,
  291         .pr_init =              encap_init,
  292         .pr_usrreqs =           &rip_usrreqs
  293 },
  294 #endif
  295 {
  296         .pr_type =              SOCK_RAW,
  297         .pr_domain =            &inetdomain,
  298         .pr_protocol =          IPPROTO_PIM,
  299         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  300         .pr_input =             encap4_input,
  301         .pr_ctloutput =         rip_ctloutput,
  302         .pr_usrreqs =           &rip_usrreqs
  303 },
  304 #ifdef DEV_PFSYNC
  305 {
  306         .pr_type =              SOCK_RAW,
  307         .pr_domain =            &inetdomain,
  308         .pr_protocol =          IPPROTO_PFSYNC,
  309         .pr_flags =             PR_ATOMIC|PR_ADDR,
  310         .pr_input =             pfsync_input,
  311         .pr_ctloutput =         rip_ctloutput,
  312         .pr_usrreqs =           &rip_usrreqs
  313 },
  314 #endif  /* DEV_PFSYNC */
  315 #ifdef DEV_CARP
  316 {
  317         .pr_type =              SOCK_RAW,
  318         .pr_domain =            &inetdomain,
  319         .pr_protocol =          IPPROTO_CARP,
  320         .pr_flags =             PR_ATOMIC|PR_ADDR,
  321         .pr_input =             carp_input,
  322         .pr_output =            (pr_output_t*)rip_output,
  323         .pr_ctloutput =         rip_ctloutput,
  324         .pr_usrreqs =           &rip_usrreqs
  325 },
  326 #endif /* DEV_CARP */
  327 /* Spacer n-times for loadable protocols. */
  328 IPPROTOSPACER,
  329 IPPROTOSPACER,
  330 IPPROTOSPACER,
  331 IPPROTOSPACER,
  332 IPPROTOSPACER,
  333 IPPROTOSPACER,
  334 IPPROTOSPACER,
  335 IPPROTOSPACER,
  336 /* raw wildcard */
  337 {
  338         .pr_type =              SOCK_RAW,
  339         .pr_domain =            &inetdomain,
  340         .pr_flags =             PR_ATOMIC|PR_ADDR,
  341         .pr_input =             rip_input,
  342         .pr_ctloutput =         rip_ctloutput,
  343         .pr_init =              rip_init,
  344         .pr_usrreqs =           &rip_usrreqs
  345 },
  346 };
  347 
  348 extern int in_inithead(void **, int);
  349 
  350 struct domain inetdomain = {
  351         .dom_family =           AF_INET,
  352         .dom_name =             "internet",
  353         .dom_protosw =          inetsw,
  354         .dom_protoswNPROTOSW =  &inetsw[sizeof(inetsw)/sizeof(inetsw[0])],
  355         .dom_rtattach =         in_inithead,
  356         .dom_rtoffset =         32,
  357         .dom_maxrtkey =         sizeof(struct sockaddr_in)
  358 };
  359 
  360 DOMAIN_SET(inet);
  361 
  362 SYSCTL_NODE(_net,      PF_INET,         inet,   CTLFLAG_RW, 0,
  363         "Internet Family");
  364 
  365 SYSCTL_NODE(_net_inet, IPPROTO_IP,      ip,     CTLFLAG_RW, 0,  "IP");
  366 SYSCTL_NODE(_net_inet, IPPROTO_ICMP,    icmp,   CTLFLAG_RW, 0,  "ICMP");
  367 SYSCTL_NODE(_net_inet, IPPROTO_UDP,     udp,    CTLFLAG_RW, 0,  "UDP");
  368 SYSCTL_NODE(_net_inet, IPPROTO_TCP,     tcp,    CTLFLAG_RW, 0,  "TCP");
  369 #ifdef SCTP
  370 SYSCTL_NODE(_net_inet, IPPROTO_SCTP,    sctp,   CTLFLAG_RW, 0,  "SCTP");
  371 #endif
  372 SYSCTL_NODE(_net_inet, IPPROTO_IGMP,    igmp,   CTLFLAG_RW, 0,  "IGMP");
  373 #ifdef IPSEC
  374 /* XXX no protocol # to use, pick something "reserved" */
  375 SYSCTL_NODE(_net_inet, 253,             ipsec,  CTLFLAG_RW, 0,  "IPSEC");
  376 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ah,     CTLFLAG_RW, 0,  "AH");
  377 SYSCTL_NODE(_net_inet, IPPROTO_ESP,     esp,    CTLFLAG_RW, 0,  "ESP");
  378 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP,  ipcomp, CTLFLAG_RW, 0,  "IPCOMP");
  379 SYSCTL_NODE(_net_inet, IPPROTO_IPIP,    ipip,   CTLFLAG_RW, 0,  "IPIP");
  380 #endif /* IPSEC */
  381 SYSCTL_NODE(_net_inet, IPPROTO_RAW,     raw,    CTLFLAG_RW, 0,  "RAW");
  382 #ifdef DEV_PFSYNC
  383 SYSCTL_NODE(_net_inet, IPPROTO_PFSYNC,  pfsync, CTLFLAG_RW, 0,  "PFSYNC");
  384 #endif
  385 #ifdef DEV_CARP
  386 SYSCTL_NODE(_net_inet, IPPROTO_CARP,    carp,   CTLFLAG_RW, 0,  "CARP");
  387 #endif

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