The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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: stable/9/sys/netinet/in_proto.c 230868 2012-02-01 15:57:49Z glebius $");
   34 
   35 #include "opt_ipx.h"
   36 #include "opt_mrouting.h"
   37 #include "opt_ipsec.h"
   38 #include "opt_inet.h"
   39 #include "opt_inet6.h"
   40 #include "opt_sctp.h"
   41 #include "opt_mpath.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/proc.h>
   49 #include <sys/protosw.h>
   50 #include <sys/queue.h>
   51 #include <sys/sysctl.h>
   52 
   53 /*
   54  * While this file provides the domain and protocol switch tables for IPv4, it
   55  * also provides the sysctl node declarations for net.inet.* often shared with
   56  * IPv6 for common features or by upper layer protocols.  In case of no IPv4
   57  * support compile out everything but these sysctl nodes.
   58  */
   59 #ifdef INET
   60 #include <net/if.h>
   61 #include <net/route.h>
   62 #ifdef RADIX_MPATH
   63 #include <net/radix_mpath.h>
   64 #endif
   65 #include <net/vnet.h>
   66 #endif /* INET */
   67 
   68 #if defined(INET) || defined(INET6)
   69 #include <netinet/in.h>
   70 #endif
   71 
   72 #ifdef INET
   73 #include <netinet/in_systm.h>
   74 #include <netinet/in_var.h>
   75 #include <netinet/ip.h>
   76 #include <netinet/ip_var.h>
   77 #include <netinet/ip_icmp.h>
   78 #include <netinet/igmp_var.h>
   79 #include <netinet/tcp.h>
   80 #include <netinet/tcp_timer.h>
   81 #include <netinet/tcp_var.h>
   82 #include <netinet/udp.h>
   83 #include <netinet/udp_var.h>
   84 #include <netinet/ip_encap.h>
   85 
   86 /*
   87  * TCP/IP protocol family: IP, ICMP, UDP, TCP.
   88  */
   89 
   90 static struct pr_usrreqs nousrreqs;
   91 
   92 #ifdef IPSEC
   93 #include <netipsec/ipsec.h>
   94 #endif /* IPSEC */
   95 
   96 #ifdef SCTP
   97 #include <netinet/in_pcb.h>
   98 #include <netinet/sctp_pcb.h>
   99 #include <netinet/sctp.h>
  100 #include <netinet/sctp_var.h>
  101 #endif /* SCTP */
  102 
  103 FEATURE(inet, "Internet Protocol version 4");
  104 
  105 extern  struct domain inetdomain;
  106 
  107 /* Spacer for loadable protocols. */
  108 #define IPPROTOSPACER                           \
  109 {                                               \
  110         .pr_domain =            &inetdomain,    \
  111         .pr_protocol =          PROTO_SPACER,   \
  112         .pr_usrreqs =           &nousrreqs      \
  113 }
  114 
  115 struct protosw inetsw[] = {
  116 {
  117         .pr_type =              0,
  118         .pr_domain =            &inetdomain,
  119         .pr_protocol =          IPPROTO_IP,
  120         .pr_init =              ip_init,
  121 #ifdef VIMAGE
  122         .pr_destroy =           ip_destroy,
  123 #endif
  124         .pr_slowtimo =          ip_slowtimo,
  125         .pr_drain =             ip_drain,
  126         .pr_usrreqs =           &nousrreqs
  127 },
  128 {
  129         .pr_type =              SOCK_DGRAM,
  130         .pr_domain =            &inetdomain,
  131         .pr_protocol =          IPPROTO_UDP,
  132         .pr_flags =             PR_ATOMIC|PR_ADDR,
  133         .pr_input =             udp_input,
  134         .pr_ctlinput =          udp_ctlinput,
  135         .pr_ctloutput =         udp_ctloutput,
  136         .pr_init =              udp_init,
  137 #ifdef VIMAGE
  138         .pr_destroy =           udp_destroy,
  139 #endif
  140         .pr_usrreqs =           &udp_usrreqs
  141 },
  142 {
  143         .pr_type =              SOCK_STREAM,
  144         .pr_domain =            &inetdomain,
  145         .pr_protocol =          IPPROTO_TCP,
  146         .pr_flags =             PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
  147         .pr_input =             tcp_input,
  148         .pr_ctlinput =          tcp_ctlinput,
  149         .pr_ctloutput =         tcp_ctloutput,
  150         .pr_init =              tcp_init,
  151 #ifdef VIMAGE
  152         .pr_destroy =           tcp_destroy,
  153 #endif
  154         .pr_slowtimo =          tcp_slowtimo,
  155         .pr_drain =             tcp_drain,
  156         .pr_usrreqs =           &tcp_usrreqs
  157 },
  158 #ifdef SCTP
  159 { 
  160         .pr_type =              SOCK_SEQPACKET,
  161         .pr_domain =            &inetdomain,
  162         .pr_protocol =          IPPROTO_SCTP,
  163         .pr_flags =             PR_WANTRCVD,
  164         .pr_input =             sctp_input,
  165         .pr_ctlinput =          sctp_ctlinput,
  166         .pr_ctloutput =         sctp_ctloutput,
  167         .pr_init =              sctp_init,
  168 #ifdef VIMAGE
  169         .pr_destroy =           sctp_finish,
  170 #endif
  171         .pr_drain =             sctp_drain,
  172         .pr_usrreqs =           &sctp_usrreqs
  173 },
  174 { 
  175         .pr_type =              SOCK_STREAM,
  176         .pr_domain =            &inetdomain,
  177         .pr_protocol =          IPPROTO_SCTP,
  178         .pr_flags =             PR_WANTRCVD,
  179         .pr_input =             sctp_input,
  180         .pr_ctlinput =          sctp_ctlinput,
  181         .pr_ctloutput =         sctp_ctloutput,
  182         .pr_drain =             sctp_drain,
  183         .pr_usrreqs =           &sctp_usrreqs
  184 },
  185 #endif /* SCTP */
  186 {
  187         .pr_type =              SOCK_RAW,
  188         .pr_domain =            &inetdomain,
  189         .pr_protocol =          IPPROTO_RAW,
  190         .pr_flags =             PR_ATOMIC|PR_ADDR,
  191         .pr_input =             rip_input,
  192         .pr_ctlinput =          rip_ctlinput,
  193         .pr_ctloutput =         rip_ctloutput,
  194         .pr_usrreqs =           &rip_usrreqs
  195 },
  196 {
  197         .pr_type =              SOCK_RAW,
  198         .pr_domain =            &inetdomain,
  199         .pr_protocol =          IPPROTO_ICMP,
  200         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  201         .pr_input =             icmp_input,
  202         .pr_ctloutput =         rip_ctloutput,
  203         .pr_usrreqs =           &rip_usrreqs
  204 },
  205 {
  206         .pr_type =              SOCK_RAW,
  207         .pr_domain =            &inetdomain,
  208         .pr_protocol =          IPPROTO_IGMP,
  209         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  210         .pr_input =             igmp_input,
  211         .pr_ctloutput =         rip_ctloutput,
  212         .pr_fasttimo =          igmp_fasttimo,
  213         .pr_slowtimo =          igmp_slowtimo,
  214         .pr_usrreqs =           &rip_usrreqs
  215 },
  216 {
  217         .pr_type =              SOCK_RAW,
  218         .pr_domain =            &inetdomain,
  219         .pr_protocol =          IPPROTO_RSVP,
  220         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  221         .pr_input =             rsvp_input,
  222         .pr_ctloutput =         rip_ctloutput,
  223         .pr_usrreqs =           &rip_usrreqs
  224 },
  225 #ifdef IPSEC
  226 {
  227         .pr_type =              SOCK_RAW,
  228         .pr_domain =            &inetdomain,
  229         .pr_protocol =          IPPROTO_AH,
  230         .pr_flags =             PR_ATOMIC|PR_ADDR,
  231         .pr_input =             ah4_input,
  232         .pr_ctlinput =          ah4_ctlinput,
  233         .pr_usrreqs =           &nousrreqs
  234 },
  235 {
  236         .pr_type =              SOCK_RAW,
  237         .pr_domain =            &inetdomain,
  238         .pr_protocol =          IPPROTO_ESP,
  239         .pr_flags =             PR_ATOMIC|PR_ADDR,
  240         .pr_input =             esp4_input,
  241         .pr_ctlinput =          esp4_ctlinput,
  242         .pr_usrreqs =           &nousrreqs
  243 },
  244 {
  245         .pr_type =              SOCK_RAW,
  246         .pr_domain =            &inetdomain,
  247         .pr_protocol =          IPPROTO_IPCOMP,
  248         .pr_flags =             PR_ATOMIC|PR_ADDR,
  249         .pr_input =             ipcomp4_input,
  250         .pr_usrreqs =           &nousrreqs
  251 },
  252 #endif /* IPSEC */
  253 {
  254         .pr_type =              SOCK_RAW,
  255         .pr_domain =            &inetdomain,
  256         .pr_protocol =          IPPROTO_IPV4,
  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_MOBILE,
  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_ETHERIP,
  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 {
  284         .pr_type =              SOCK_RAW,
  285         .pr_domain =            &inetdomain,
  286         .pr_protocol =          IPPROTO_GRE,
  287         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  288         .pr_input =             encap4_input,
  289         .pr_ctloutput =         rip_ctloutput,
  290         .pr_init =              encap_init,
  291         .pr_usrreqs =           &rip_usrreqs
  292 },
  293 # ifdef INET6
  294 {
  295         .pr_type =              SOCK_RAW,
  296         .pr_domain =            &inetdomain,
  297         .pr_protocol =          IPPROTO_IPV6,
  298         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  299         .pr_input =             encap4_input,
  300         .pr_ctloutput =         rip_ctloutput,
  301         .pr_init =              encap_init,
  302         .pr_usrreqs =           &rip_usrreqs
  303 },
  304 #endif
  305 {
  306         .pr_type =              SOCK_RAW,
  307         .pr_domain =            &inetdomain,
  308         .pr_protocol =          IPPROTO_PIM,
  309         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  310         .pr_input =             encap4_input,
  311         .pr_ctloutput =         rip_ctloutput,
  312         .pr_usrreqs =           &rip_usrreqs
  313 },
  314 /* Spacer n-times for loadable protocols. */
  315 IPPROTOSPACER,
  316 IPPROTOSPACER,
  317 IPPROTOSPACER,
  318 IPPROTOSPACER,
  319 IPPROTOSPACER,
  320 IPPROTOSPACER,
  321 IPPROTOSPACER,
  322 IPPROTOSPACER,
  323 /* raw wildcard */
  324 {
  325         .pr_type =              SOCK_RAW,
  326         .pr_domain =            &inetdomain,
  327         .pr_flags =             PR_ATOMIC|PR_ADDR,
  328         .pr_input =             rip_input,
  329         .pr_ctloutput =         rip_ctloutput,
  330         .pr_init =              rip_init,
  331 #ifdef VIMAGE
  332         .pr_destroy =           rip_destroy,
  333 #endif
  334         .pr_usrreqs =           &rip_usrreqs
  335 },
  336 };
  337 
  338 extern int in_inithead(void **, int);
  339 extern int in_detachhead(void **, int);
  340 
  341 struct domain inetdomain = {
  342         .dom_family =           AF_INET,
  343         .dom_name =             "internet",
  344         .dom_protosw =          inetsw,
  345         .dom_protoswNPROTOSW =  &inetsw[sizeof(inetsw)/sizeof(inetsw[0])],
  346 #ifdef RADIX_MPATH
  347         .dom_rtattach =         rn4_mpath_inithead,
  348 #else
  349         .dom_rtattach =         in_inithead,
  350 #endif
  351 #ifdef VIMAGE
  352         .dom_rtdetach =         in_detachhead,
  353 #endif
  354         .dom_rtoffset =         32,
  355         .dom_maxrtkey =         sizeof(struct sockaddr_in),
  356         .dom_ifattach =         in_domifattach,
  357         .dom_ifdetach =         in_domifdetach
  358 };
  359 
  360 VNET_DOMAIN_SET(inet);
  361 #endif /* INET */
  362 
  363 SYSCTL_NODE(_net,      PF_INET,         inet,   CTLFLAG_RW, 0,
  364         "Internet Family");
  365 
  366 SYSCTL_NODE(_net_inet, IPPROTO_IP,      ip,     CTLFLAG_RW, 0,  "IP");
  367 SYSCTL_NODE(_net_inet, IPPROTO_ICMP,    icmp,   CTLFLAG_RW, 0,  "ICMP");
  368 SYSCTL_NODE(_net_inet, IPPROTO_UDP,     udp,    CTLFLAG_RW, 0,  "UDP");
  369 SYSCTL_NODE(_net_inet, IPPROTO_TCP,     tcp,    CTLFLAG_RW, 0,  "TCP");
  370 #ifdef SCTP
  371 SYSCTL_NODE(_net_inet, IPPROTO_SCTP,    sctp,   CTLFLAG_RW, 0,  "SCTP");
  372 #endif
  373 SYSCTL_NODE(_net_inet, IPPROTO_IGMP,    igmp,   CTLFLAG_RW, 0,  "IGMP");
  374 #ifdef IPSEC
  375 /* XXX no protocol # to use, pick something "reserved" */
  376 SYSCTL_NODE(_net_inet, 253,             ipsec,  CTLFLAG_RW, 0,  "IPSEC");
  377 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ah,     CTLFLAG_RW, 0,  "AH");
  378 SYSCTL_NODE(_net_inet, IPPROTO_ESP,     esp,    CTLFLAG_RW, 0,  "ESP");
  379 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP,  ipcomp, CTLFLAG_RW, 0,  "IPCOMP");
  380 SYSCTL_NODE(_net_inet, IPPROTO_IPIP,    ipip,   CTLFLAG_RW, 0,  "IPIP");
  381 #endif /* IPSEC */
  382 SYSCTL_NODE(_net_inet, IPPROTO_RAW,     raw,    CTLFLAG_RW, 0,  "RAW");

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