sys/netinet/in_proto.c

   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("$FreeBSD$");
  34
  35 #include "opt_mrouting.h"
  36 #include "opt_ipsec.h"
  37 #include "opt_inet.h"
  38 #include "opt_inet6.h"
  39 #include "opt_sctp.h"
  40 #include "opt_mpath.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/kernel.h>
  45 #include <sys/malloc.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/if_var.h>
  62 #include <net/route.h>
  63 #ifdef RADIX_MPATH
  64 #include <net/radix_mpath.h>
  65 #endif
  66 #include <net/vnet.h>
  67 #endif /* INET */
  68
  69 #if defined(INET) || defined(INET6)
  70 #include <netinet/in.h>
  71 #endif
  72
  73 #ifdef INET
  74 #include <netinet/in_systm.h>
  75 #include <netinet/in_var.h>
  76 #include <netinet/ip.h>
  77 #include <netinet/ip_var.h>
  78 #include <netinet/ip_icmp.h>
  79 #include <netinet/igmp_var.h>
  80 #include <netinet/tcp.h>
  81 #include <netinet/tcp_timer.h>
  82 #include <netinet/tcp_var.h>
  83 #include <netinet/udp.h>
  84 #include <netinet/udp_var.h>
  85 #include <netinet/ip_encap.h>
  86
  87 /*
  88  * TCP/IP protocol family: IP, ICMP, UDP, TCP.
  89  */
  90
  91 static struct pr_usrreqs nousrreqs;
  92
  93 #ifdef SCTP
  94 #include <netinet/in_pcb.h>
  95 #include <netinet/sctp_pcb.h>
  96 #include <netinet/sctp.h>
  97 #include <netinet/sctp_var.h>
  98 #endif /* SCTP */
  99
 100 FEATURE(inet, "Internet Protocol version 4");
 101
 102 extern  struct domain inetdomain;
 103
 104 /* Spacer for loadable protocols. */
 105 #define IPPROTOSPACER                           \
 106 {                                               \
 107         .pr_domain =            &inetdomain,    \
 108         .pr_protocol =          PROTO_SPACER,   \
 109         .pr_usrreqs =           &nousrreqs      \
 110 }
 111
 112 struct protosw inetsw[] = {
 113 {
 114         .pr_type =              0,
 115         .pr_domain =            &inetdomain,
 116         .pr_protocol =          IPPROTO_IP,
 117         .pr_init =              ip_init,
 118         .pr_slowtimo =          ip_slowtimo,
 119         .pr_drain =             ip_drain,
 120         .pr_usrreqs =           &nousrreqs
 121 },
 122 {
 123         .pr_type =              SOCK_DGRAM,
 124         .pr_domain =            &inetdomain,
 125         .pr_protocol =          IPPROTO_UDP,
 126         .pr_flags =             PR_ATOMIC|PR_ADDR,
 127         .pr_input =             udp_input,
 128         .pr_ctlinput =          udp_ctlinput,
 129         .pr_ctloutput =         udp_ctloutput,
 130         .pr_init =              udp_init,
 131         .pr_usrreqs =           &udp_usrreqs
 132 },
 133 {
 134         .pr_type =              SOCK_STREAM,
 135         .pr_domain =            &inetdomain,
 136         .pr_protocol =          IPPROTO_TCP,
 137         .pr_flags =             PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
 138         .pr_input =             tcp_input,
 139         .pr_ctlinput =          tcp_ctlinput,
 140         .pr_ctloutput =         tcp_ctloutput,
 141         .pr_init =              tcp_init,
 142         .pr_slowtimo =          tcp_slowtimo,
 143         .pr_drain =             tcp_drain,
 144         .pr_usrreqs =           &tcp_usrreqs
 145 },
 146 #ifdef SCTP
 147 {
 148         .pr_type =              SOCK_SEQPACKET,
 149         .pr_domain =            &inetdomain,
 150         .pr_protocol =          IPPROTO_SCTP,
 151         .pr_flags =             PR_WANTRCVD|PR_LASTHDR,
 152         .pr_input =             sctp_input,
 153         .pr_ctlinput =          sctp_ctlinput,
 154         .pr_ctloutput =         sctp_ctloutput,
 155         .pr_init =              sctp_init,
 156         .pr_drain =             sctp_drain,
 157         .pr_usrreqs =           &sctp_usrreqs
 158 },
 159 {
 160         .pr_type =              SOCK_STREAM,
 161         .pr_domain =            &inetdomain,
 162         .pr_protocol =          IPPROTO_SCTP,
 163         .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_LASTHDR,
 164         .pr_input =             sctp_input,
 165         .pr_ctlinput =          sctp_ctlinput,
 166         .pr_ctloutput =         sctp_ctloutput,
 167         .pr_drain =             sctp_drain,
 168         .pr_usrreqs =           &sctp_usrreqs
 169 },
 170 #endif /* SCTP */
 171 {
 172         .pr_type =              SOCK_DGRAM,
 173         .pr_domain =            &inetdomain,
 174         .pr_protocol =          IPPROTO_UDPLITE,
 175         .pr_flags =             PR_ATOMIC|PR_ADDR,
 176         .pr_input =             udp_input,
 177         .pr_ctlinput =          udplite_ctlinput,
 178         .pr_ctloutput =         udp_ctloutput,
 179         .pr_init =              udplite_init,
 180         .pr_usrreqs =           &udp_usrreqs
 181 },
 182 {
 183         .pr_type =              SOCK_RAW,
 184         .pr_domain =            &inetdomain,
 185         .pr_protocol =          IPPROTO_RAW,
 186         .pr_flags =             PR_ATOMIC|PR_ADDR,
 187         .pr_input =             rip_input,
 188         .pr_ctlinput =          rip_ctlinput,
 189         .pr_ctloutput =         rip_ctloutput,
 190         .pr_usrreqs =           &rip_usrreqs
 191 },
 192 {
 193         .pr_type =              SOCK_RAW,
 194         .pr_domain =            &inetdomain,
 195         .pr_protocol =          IPPROTO_ICMP,
 196         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 197         .pr_input =             icmp_input,
 198         .pr_ctloutput =         rip_ctloutput,
 199         .pr_usrreqs =           &rip_usrreqs
 200 },
 201 {
 202         .pr_type =              SOCK_RAW,
 203         .pr_domain =            &inetdomain,
 204         .pr_protocol =          IPPROTO_IGMP,
 205         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 206         .pr_input =             igmp_input,
 207         .pr_ctloutput =         rip_ctloutput,
 208         .pr_fasttimo =          igmp_fasttimo,
 209         .pr_slowtimo =          igmp_slowtimo,
 210         .pr_usrreqs =           &rip_usrreqs
 211 },
 212 {
 213         .pr_type =              SOCK_RAW,
 214         .pr_domain =            &inetdomain,
 215         .pr_protocol =          IPPROTO_RSVP,
 216         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 217         .pr_input =             rsvp_input,
 218         .pr_ctloutput =         rip_ctloutput,
 219         .pr_usrreqs =           &rip_usrreqs
 220 },
 221 {
 222         .pr_type =              SOCK_RAW,
 223         .pr_domain =            &inetdomain,
 224         .pr_protocol =          IPPROTO_IPV4,
 225         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 226         .pr_input =             encap4_input,
 227         .pr_ctloutput =         rip_ctloutput,
 228         .pr_init =              encap_init,
 229         .pr_usrreqs =           &rip_usrreqs
 230 },
 231 {
 232         .pr_type =              SOCK_RAW,
 233         .pr_domain =            &inetdomain,
 234         .pr_protocol =          IPPROTO_MOBILE,
 235         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 236         .pr_input =             encap4_input,
 237         .pr_ctloutput =         rip_ctloutput,
 238         .pr_init =              encap_init,
 239         .pr_usrreqs =           &rip_usrreqs
 240 },
 241 {
 242         .pr_type =              SOCK_RAW,
 243         .pr_domain =            &inetdomain,
 244         .pr_protocol =          IPPROTO_ETHERIP,
 245         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 246         .pr_input =             encap4_input,
 247         .pr_ctloutput =         rip_ctloutput,
 248         .pr_init =              encap_init,
 249         .pr_usrreqs =           &rip_usrreqs
 250 },
 251 {
 252         .pr_type =              SOCK_RAW,
 253         .pr_domain =            &inetdomain,
 254         .pr_protocol =          IPPROTO_GRE,
 255         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 256         .pr_input =             encap4_input,
 257         .pr_ctloutput =         rip_ctloutput,
 258         .pr_init =              encap_init,
 259         .pr_usrreqs =           &rip_usrreqs
 260 },
 261 # ifdef INET6
 262 {
 263         .pr_type =              SOCK_RAW,
 264         .pr_domain =            &inetdomain,
 265         .pr_protocol =          IPPROTO_IPV6,
 266         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 267         .pr_input =             encap4_input,
 268         .pr_ctloutput =         rip_ctloutput,
 269         .pr_init =              encap_init,
 270         .pr_usrreqs =           &rip_usrreqs
 271 },
 272 #endif
 273 {
 274         .pr_type =              SOCK_RAW,
 275         .pr_domain =            &inetdomain,
 276         .pr_protocol =          IPPROTO_PIM,
 277         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 278         .pr_input =             encap4_input,
 279         .pr_ctloutput =         rip_ctloutput,
 280         .pr_usrreqs =           &rip_usrreqs
 281 },
 282 /* Spacer n-times for loadable protocols. */
 283 IPPROTOSPACER,
 284 IPPROTOSPACER,
 285 IPPROTOSPACER,
 286 IPPROTOSPACER,
 287 IPPROTOSPACER,
 288 IPPROTOSPACER,
 289 IPPROTOSPACER,
 290 IPPROTOSPACER,
 291 /* raw wildcard */
 292 {
 293         .pr_type =              SOCK_RAW,
 294         .pr_domain =            &inetdomain,
 295         .pr_flags =             PR_ATOMIC|PR_ADDR,
 296         .pr_input =             rip_input,
 297         .pr_ctloutput =         rip_ctloutput,
 298         .pr_init =              rip_init,
 299         .pr_usrreqs =           &rip_usrreqs
 300 },
 301 };
 302
 303 extern int in_inithead(void **, int);
 304 extern int in_detachhead(void **, int);
 305
 306 struct domain inetdomain = {
 307         .dom_family =           AF_INET,
 308         .dom_name =             "internet",
 309         .dom_protosw =          inetsw,
 310         .dom_protoswNPROTOSW =  &inetsw[nitems(inetsw)],
 311 #ifdef RADIX_MPATH
 312         .dom_rtattach =         rn4_mpath_inithead,
 313 #else
 314         .dom_rtattach =         in_inithead,
 315 #endif
 316 #ifdef VIMAGE
 317         .dom_rtdetach =         in_detachhead,
 318 #endif
 319         .dom_ifattach =         in_domifattach,
 320         .dom_ifdetach =         in_domifdetach
 321 };
 322
 323 VNET_DOMAIN_SET(inet);
 324 #endif /* INET */
 325
 326 SYSCTL_NODE(_net,      PF_INET,         inet,   CTLFLAG_RW, 0,
 327         "Internet Family");
 328
 329 SYSCTL_NODE(_net_inet, IPPROTO_IP,      ip,     CTLFLAG_RW, 0,  "IP");
 330 SYSCTL_NODE(_net_inet, IPPROTO_ICMP,    icmp,   CTLFLAG_RW, 0,  "ICMP");
 331 SYSCTL_NODE(_net_inet, IPPROTO_UDP,     udp,    CTLFLAG_RW, 0,  "UDP");
 332 SYSCTL_NODE(_net_inet, IPPROTO_TCP,     tcp,    CTLFLAG_RW, 0,  "TCP");
 333 #ifdef SCTP
 334 SYSCTL_NODE(_net_inet, IPPROTO_SCTP,    sctp,   CTLFLAG_RW, 0,  "SCTP");
 335 #endif
 336 SYSCTL_NODE(_net_inet, IPPROTO_IGMP,    igmp,   CTLFLAG_RW, 0,  "IGMP");
 337 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 338 /* XXX no protocol # to use, pick something "reserved" */
 339 SYSCTL_NODE(_net_inet, 253,             ipsec,  CTLFLAG_RW, 0,  "IPSEC");
 340 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ah,     CTLFLAG_RW, 0,  "AH");
 341 SYSCTL_NODE(_net_inet, IPPROTO_ESP,     esp,    CTLFLAG_RW, 0,  "ESP");
 342 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP,  ipcomp, CTLFLAG_RW, 0,  "IPCOMP");
 343 SYSCTL_NODE(_net_inet, IPPROTO_IPIP,    ipip,   CTLFLAG_RW, 0,  "IPIP");
 344 #endif /* IPSEC */
 345 SYSCTL_NODE(_net_inet, IPPROTO_RAW,     raw,    CTLFLAG_RW, 0,  "RAW");
 346 SYSCTL_NODE(_net_inet, OID_AUTO,        accf,   CTLFLAG_RW, 0,
 347     "Accept filters");