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 IPSEC
  94 #include <netipsec/ipsec.h>
  95 #endif /* IPSEC */
  96
  97 #ifdef SCTP
  98 #include <netinet/in_pcb.h>
  99 #include <netinet/sctp_pcb.h>
 100 #include <netinet/sctp.h>
 101 #include <netinet/sctp_var.h>
 102 #endif /* SCTP */
 103
 104 FEATURE(inet, "Internet Protocol version 4");
 105
 106 extern  struct domain inetdomain;
 107
 108 /* Spacer for loadable protocols. */
 109 #define IPPROTOSPACER                           \
 110 {                                               \
 111         .pr_domain =            &inetdomain,    \
 112         .pr_protocol =          PROTO_SPACER,   \
 113         .pr_usrreqs =           &nousrreqs      \
 114 }
 115
 116 struct protosw inetsw[] = {
 117 {
 118         .pr_type =              0,
 119         .pr_domain =            &inetdomain,
 120         .pr_protocol =          IPPROTO_IP,
 121         .pr_init =              ip_init,
 122 #ifdef VIMAGE
 123         .pr_destroy =           ip_destroy,
 124 #endif
 125         .pr_slowtimo =          ip_slowtimo,
 126         .pr_drain =             ip_drain,
 127         .pr_usrreqs =           &nousrreqs
 128 },
 129 {
 130         .pr_type =              SOCK_DGRAM,
 131         .pr_domain =            &inetdomain,
 132         .pr_protocol =          IPPROTO_UDP,
 133         .pr_flags =             PR_ATOMIC|PR_ADDR,
 134         .pr_input =             udp_input,
 135         .pr_ctlinput =          udp_ctlinput,
 136         .pr_ctloutput =         udp_ctloutput,
 137         .pr_init =              udp_init,
 138 #ifdef VIMAGE
 139         .pr_destroy =           udp_destroy,
 140 #endif
 141         .pr_usrreqs =           &udp_usrreqs
 142 },
 143 {
 144         .pr_type =              SOCK_STREAM,
 145         .pr_domain =            &inetdomain,
 146         .pr_protocol =          IPPROTO_TCP,
 147         .pr_flags =             PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
 148         .pr_input =             tcp_input,
 149         .pr_ctlinput =          tcp_ctlinput,
 150         .pr_ctloutput =         tcp_ctloutput,
 151         .pr_init =              tcp_init,
 152 #ifdef VIMAGE
 153         .pr_destroy =           tcp_destroy,
 154 #endif
 155         .pr_slowtimo =          tcp_slowtimo,
 156         .pr_drain =             tcp_drain,
 157         .pr_usrreqs =           &tcp_usrreqs
 158 },
 159 #ifdef SCTP
 160 {
 161         .pr_type =              SOCK_SEQPACKET,
 162         .pr_domain =            &inetdomain,
 163         .pr_protocol =          IPPROTO_SCTP,
 164         .pr_flags =             PR_WANTRCVD,
 165         .pr_input =             sctp_input,
 166         .pr_ctlinput =          sctp_ctlinput,
 167         .pr_ctloutput =         sctp_ctloutput,
 168         .pr_init =              sctp_init,
 169 #ifdef VIMAGE
 170         .pr_destroy =           sctp_finish,
 171 #endif
 172         .pr_drain =             sctp_drain,
 173         .pr_usrreqs =           &sctp_usrreqs
 174 },
 175 {
 176         .pr_type =              SOCK_STREAM,
 177         .pr_domain =            &inetdomain,
 178         .pr_protocol =          IPPROTO_SCTP,
 179         .pr_flags =             PR_WANTRCVD,
 180         .pr_input =             sctp_input,
 181         .pr_ctlinput =          sctp_ctlinput,
 182         .pr_ctloutput =         sctp_ctloutput,
 183         .pr_drain =             sctp_drain,
 184         .pr_usrreqs =           &sctp_usrreqs
 185 },
 186 #endif /* SCTP */
 187 {
 188         .pr_type =              SOCK_DGRAM,
 189         .pr_domain =            &inetdomain,
 190         .pr_protocol =          IPPROTO_UDPLITE,
 191         .pr_flags =             PR_ATOMIC|PR_ADDR,
 192         .pr_input =             udp_input,
 193         .pr_ctlinput =          udplite_ctlinput,
 194         .pr_ctloutput =         udp_ctloutput,
 195         .pr_init =              udplite_init,
 196 #ifdef VIMAGE
 197         .pr_destroy =           udplite_destroy,
 198 #endif
 199         .pr_usrreqs =           &udp_usrreqs
 200 },
 201 {
 202         .pr_type =              SOCK_RAW,
 203         .pr_domain =            &inetdomain,
 204         .pr_protocol =          IPPROTO_RAW,
 205         .pr_flags =             PR_ATOMIC|PR_ADDR,
 206         .pr_input =             rip_input,
 207         .pr_ctlinput =          rip_ctlinput,
 208         .pr_ctloutput =         rip_ctloutput,
 209         .pr_usrreqs =           &rip_usrreqs
 210 },
 211 {
 212         .pr_type =              SOCK_RAW,
 213         .pr_domain =            &inetdomain,
 214         .pr_protocol =          IPPROTO_ICMP,
 215         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 216         .pr_input =             icmp_input,
 217         .pr_ctloutput =         rip_ctloutput,
 218         .pr_usrreqs =           &rip_usrreqs
 219 },
 220 {
 221         .pr_type =              SOCK_RAW,
 222         .pr_domain =            &inetdomain,
 223         .pr_protocol =          IPPROTO_IGMP,
 224         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 225         .pr_input =             igmp_input,
 226         .pr_ctloutput =         rip_ctloutput,
 227         .pr_fasttimo =          igmp_fasttimo,
 228         .pr_slowtimo =          igmp_slowtimo,
 229         .pr_usrreqs =           &rip_usrreqs
 230 },
 231 {
 232         .pr_type =              SOCK_RAW,
 233         .pr_domain =            &inetdomain,
 234         .pr_protocol =          IPPROTO_RSVP,
 235         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 236         .pr_input =             rsvp_input,
 237         .pr_ctloutput =         rip_ctloutput,
 238         .pr_usrreqs =           &rip_usrreqs
 239 },
 240 #ifdef IPSEC
 241 {
 242         .pr_type =              SOCK_RAW,
 243         .pr_domain =            &inetdomain,
 244         .pr_protocol =          IPPROTO_AH,
 245         .pr_flags =             PR_ATOMIC|PR_ADDR,
 246         .pr_input =             ah4_input,
 247         .pr_ctlinput =          ah4_ctlinput,
 248         .pr_usrreqs =           &nousrreqs
 249 },
 250 {
 251         .pr_type =              SOCK_RAW,
 252         .pr_domain =            &inetdomain,
 253         .pr_protocol =          IPPROTO_ESP,
 254         .pr_flags =             PR_ATOMIC|PR_ADDR,
 255         .pr_input =             esp4_input,
 256         .pr_ctlinput =          esp4_ctlinput,
 257         .pr_usrreqs =           &nousrreqs
 258 },
 259 {
 260         .pr_type =              SOCK_RAW,
 261         .pr_domain =            &inetdomain,
 262         .pr_protocol =          IPPROTO_IPCOMP,
 263         .pr_flags =             PR_ATOMIC|PR_ADDR,
 264         .pr_input =             ipcomp4_input,
 265         .pr_usrreqs =           &nousrreqs
 266 },
 267 #endif /* IPSEC */
 268 {
 269         .pr_type =              SOCK_RAW,
 270         .pr_domain =            &inetdomain,
 271         .pr_protocol =          IPPROTO_IPV4,
 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 {
 279         .pr_type =              SOCK_RAW,
 280         .pr_domain =            &inetdomain,
 281         .pr_protocol =          IPPROTO_MOBILE,
 282         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 283         .pr_input =             encap4_input,
 284         .pr_ctloutput =         rip_ctloutput,
 285         .pr_init =              encap_init,
 286         .pr_usrreqs =           &rip_usrreqs
 287 },
 288 {
 289         .pr_type =              SOCK_RAW,
 290         .pr_domain =            &inetdomain,
 291         .pr_protocol =          IPPROTO_ETHERIP,
 292         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 293         .pr_input =             encap4_input,
 294         .pr_ctloutput =         rip_ctloutput,
 295         .pr_init =              encap_init,
 296         .pr_usrreqs =           &rip_usrreqs
 297 },
 298 {
 299         .pr_type =              SOCK_RAW,
 300         .pr_domain =            &inetdomain,
 301         .pr_protocol =          IPPROTO_GRE,
 302         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 303         .pr_input =             encap4_input,
 304         .pr_ctloutput =         rip_ctloutput,
 305         .pr_init =              encap_init,
 306         .pr_usrreqs =           &rip_usrreqs
 307 },
 308 # ifdef INET6
 309 {
 310         .pr_type =              SOCK_RAW,
 311         .pr_domain =            &inetdomain,
 312         .pr_protocol =          IPPROTO_IPV6,
 313         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 314         .pr_input =             encap4_input,
 315         .pr_ctloutput =         rip_ctloutput,
 316         .pr_init =              encap_init,
 317         .pr_usrreqs =           &rip_usrreqs
 318 },
 319 #endif
 320 {
 321         .pr_type =              SOCK_RAW,
 322         .pr_domain =            &inetdomain,
 323         .pr_protocol =          IPPROTO_PIM,
 324         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 325         .pr_input =             encap4_input,
 326         .pr_ctloutput =         rip_ctloutput,
 327         .pr_usrreqs =           &rip_usrreqs
 328 },
 329 /* Spacer n-times for loadable protocols. */
 330 IPPROTOSPACER,
 331 IPPROTOSPACER,
 332 IPPROTOSPACER,
 333 IPPROTOSPACER,
 334 IPPROTOSPACER,
 335 IPPROTOSPACER,
 336 IPPROTOSPACER,
 337 IPPROTOSPACER,
 338 /* raw wildcard */
 339 {
 340         .pr_type =              SOCK_RAW,
 341         .pr_domain =            &inetdomain,
 342         .pr_flags =             PR_ATOMIC|PR_ADDR,
 343         .pr_input =             rip_input,
 344         .pr_ctloutput =         rip_ctloutput,
 345         .pr_init =              rip_init,
 346 #ifdef VIMAGE
 347         .pr_destroy =           rip_destroy,
 348 #endif
 349         .pr_usrreqs =           &rip_usrreqs
 350 },
 351 };
 352
 353 extern int in_inithead(void **, int);
 354 extern int in_detachhead(void **, int);
 355
 356 struct domain inetdomain = {
 357         .dom_family =           AF_INET,
 358         .dom_name =             "internet",
 359         .dom_protosw =          inetsw,
 360         .dom_protoswNPROTOSW =  &inetsw[sizeof(inetsw)/sizeof(inetsw[0])],
 361 #ifdef RADIX_MPATH
 362         .dom_rtattach =         rn4_mpath_inithead,
 363 #else
 364         .dom_rtattach =         in_inithead,
 365 #endif
 366 #ifdef VIMAGE
 367         .dom_rtdetach =         in_detachhead,
 368 #endif
 369         .dom_ifattach =         in_domifattach,
 370         .dom_ifdetach =         in_domifdetach
 371 };
 372
 373 VNET_DOMAIN_SET(inet);
 374 #endif /* INET */
 375
 376 SYSCTL_NODE(_net,      PF_INET,         inet,   CTLFLAG_RW, 0,
 377         "Internet Family");
 378
 379 SYSCTL_NODE(_net_inet, IPPROTO_IP,      ip,     CTLFLAG_RW, 0,  "IP");
 380 SYSCTL_NODE(_net_inet, IPPROTO_ICMP,    icmp,   CTLFLAG_RW, 0,  "ICMP");
 381 SYSCTL_NODE(_net_inet, IPPROTO_UDP,     udp,    CTLFLAG_RW, 0,  "UDP");
 382 SYSCTL_NODE(_net_inet, IPPROTO_TCP,     tcp,    CTLFLAG_RW, 0,  "TCP");
 383 #ifdef SCTP
 384 SYSCTL_NODE(_net_inet, IPPROTO_SCTP,    sctp,   CTLFLAG_RW, 0,  "SCTP");
 385 #endif
 386 SYSCTL_NODE(_net_inet, IPPROTO_IGMP,    igmp,   CTLFLAG_RW, 0,  "IGMP");
 387 #ifdef IPSEC
 388 /* XXX no protocol # to use, pick something "reserved" */
 389 SYSCTL_NODE(_net_inet, 253,             ipsec,  CTLFLAG_RW, 0,  "IPSEC");
 390 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ah,     CTLFLAG_RW, 0,  "AH");
 391 SYSCTL_NODE(_net_inet, IPPROTO_ESP,     esp,    CTLFLAG_RW, 0,  "ESP");
 392 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP,  ipcomp, CTLFLAG_RW, 0,  "IPCOMP");
 393 SYSCTL_NODE(_net_inet, IPPROTO_IPIP,    ipip,   CTLFLAG_RW, 0,  "IPIP");
 394 #endif /* IPSEC */
 395 SYSCTL_NODE(_net_inet, IPPROTO_RAW,     raw,    CTLFLAG_RW, 0,  "RAW");
 396 SYSCTL_NODE(_net_inet, OID_AUTO,        accf,   CTLFLAG_RW, 0,
 397     "Accept filters");