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  * 3. 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: src/sys/netinet/in_proto.c,v 1.53.2.7 2003/08/24 08:24:38 hsu Exp $
  31  */
  32
  33 #include "opt_ipdivert.h"
  34 #include "opt_ipx.h"
  35 #include "opt_mrouting.h"
  36 #include "opt_ipsec.h"
  37 #include "opt_inet6.h"
  38 #include "opt_sctp.h"
  39 #include "opt_carp.h"
  40
  41 #include <sys/param.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 #ifdef IPDIVERT
  68 #include <netinet/ip_divert.h>
  69 #endif
  70
  71 /*
  72  * TCP/IP protocol family: IP, ICMP, UDP, TCP.
  73  */
  74
  75 #ifdef IPSEC
  76 #include <netinet6/ipsec.h>
  77 #include <netinet6/ah.h>
  78 #ifdef IPSEC_ESP
  79 #include <netinet6/esp.h>
  80 #endif
  81 #include <netinet6/ipcomp.h>
  82 #endif /* IPSEC */
  83
  84 #ifdef FAST_IPSEC
  85 #include <netproto/ipsec/ipsec.h>
  86 #endif /* FAST_IPSEC */
  87
  88 #ifdef IPXIP
  89 #include <netproto/ipx/ipx_ip.h>
  90 #endif
  91
  92 #ifdef SCTP
  93 #include <netinet/in_pcb.h>
  94 #include <netinet/sctp_pcb.h>
  95 #include <netinet/sctp.h>
  96 #include <netinet/sctp_var.h>
  97 #endif /* SCTP */
  98
  99 #include <net/netisr.h>         /* for cpu0_soport */
 100
 101 #ifdef CARP
 102 #include <netinet/ip_carp.h>
 103 #endif
 104
 105 extern  struct domain inetdomain;
 106 static  struct pr_usrreqs nousrreqs;
 107
 108 struct protosw inetsw[] = {
 109     {
 110         .pr_type = 0,
 111         .pr_domain = &inetdomain,
 112         .pr_protocol = 0,
 113         .pr_flags = 0,
 114
 115         .pr_ctlport = NULL,
 116
 117         .pr_init = ip_init,
 118         .pr_fasttimo = NULL,
 119         .pr_slowtimo = ip_slowtimo,
 120         .pr_drain = ip_drain,
 121         .pr_usrreqs = &nousrreqs
 122     },
 123     {
 124         .pr_type = SOCK_DGRAM,
 125         .pr_domain = &inetdomain,
 126         .pr_protocol = IPPROTO_UDP,
 127         .pr_flags = PR_ATOMIC|PR_ADDR|PR_MPSAFE|
 128             PR_ASYNC_SEND|PR_ASEND_HOLDTD,
 129
 130         .pr_input = udp_input,
 131         .pr_output = NULL,
 132         .pr_ctlinput = udp_ctlinput,
 133         .pr_ctloutput = ip_ctloutput,
 134
 135         .pr_ctlport = udp_ctlport,
 136         .pr_init = udp_init,
 137         .pr_usrreqs = &udp_usrreqs
 138     },
 139     {
 140         .pr_type = SOCK_STREAM,
 141         .pr_domain = &inetdomain,
 142         .pr_protocol = IPPROTO_TCP,
 143         .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_MPSAFE|
 144             PR_ASYNC_SEND|PR_ASYNC_RCVD|PR_ACONN_HOLDTD|
 145             PR_RAND_INITPORT,
 146
 147         .pr_input = tcp_input,
 148         .pr_output = NULL,
 149         .pr_ctlinput = tcp_ctlinput,
 150         .pr_ctloutput = tcp_ctloutput,
 151
 152         .pr_ctlport = tcp_ctlport,
 153         .pr_init = tcp_init,
 154         .pr_fasttimo = NULL,
 155         .pr_slowtimo = NULL,
 156         .pr_drain = tcp_drain,
 157         .pr_usrreqs = &tcp_usrreqs
 158     },
 159 #ifdef SCTP
 160     /*
 161      * Order is very important here, we add the good one in
 162      * in this postion so it maps to the right ip_protox[]
 163      * postion for SCTP. Don't move the one above below
 164      * this one or IPv6/4 compatability will break
 165      */
 166     {
 167         .pr_type = SOCK_DGRAM,
 168         .pr_domain = &inetdomain,
 169         .pr_protocol = IPPROTO_SCTP,
 170         .pr_flags = PR_ADDR_OPT|PR_WANTRCVD,
 171
 172         .pr_input = sctp_input,
 173         .pr_output = NULL,
 174         .pr_ctlinput = sctp_ctlinput,
 175         .pr_ctloutput = sctp_ctloutput,
 176
 177         .pr_ctlport = cpu0_ctlport,
 178         .pr_init = sctp_init,
 179         .pr_drain = sctp_drain,
 180         .pr_usrreqs = &sctp_usrreqs
 181     },
 182     {
 183         .pr_type = SOCK_SEQPACKET,
 184         .pr_domain = &inetdomain,
 185         .pr_protocol = IPPROTO_SCTP,
 186         .pr_flags = PR_ADDR_OPT|PR_WANTRCVD,
 187
 188         .pr_input = sctp_input,
 189         .pr_output = NULL,
 190         .pr_ctlinput = sctp_ctlinput,
 191         .pr_ctloutput = sctp_ctloutput,
 192
 193         .pr_ctlport = cpu0_ctlport,
 194         .pr_drain = sctp_drain,
 195         .pr_usrreqs = &sctp_usrreqs
 196     },
 197
 198     {
 199         .pr_type = SOCK_STREAM,
 200         .pr_domain = &inetdomain,
 201         .pr_protocol = IPPROTO_SCTP,
 202         .pr_flags = PR_CONNREQUIRED|PR_ADDR_OPT|PR_WANTRCVD,
 203
 204         .pr_input = sctp_input,
 205         .pr_output = NULL,
 206         .pr_ctlinput = sctp_ctlinput,
 207         .pr_ctloutput = sctp_ctloutput,
 208
 209         .pr_ctlport = cpu0_ctlport,
 210         .pr_drain = sctp_drain,
 211         .pr_usrreqs = &sctp_usrreqs
 212     },
 213 #endif /* SCTP */
 214     {
 215         .pr_type = SOCK_RAW,
 216         .pr_domain = &inetdomain,
 217         .pr_protocol = IPPROTO_RAW,
 218         .pr_flags = PR_ATOMIC|PR_ADDR,
 219
 220         .pr_input = rip_input,
 221         .pr_output = NULL,
 222         .pr_ctlinput = rip_ctlinput,
 223         .pr_ctloutput = rip_ctloutput,
 224
 225         .pr_ctlport = cpu0_ctlport,
 226         .pr_usrreqs = &rip_usrreqs
 227     },
 228     {
 229         .pr_type = SOCK_RAW,
 230         .pr_domain = &inetdomain,
 231         .pr_protocol = IPPROTO_ICMP,
 232         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR|PR_MPSAFE,
 233
 234         .pr_input = icmp_input,
 235         .pr_output = NULL,
 236         .pr_ctlinput = NULL,
 237         .pr_ctloutput = rip_ctloutput,
 238
 239         .pr_usrreqs = &rip_usrreqs
 240     },
 241     {
 242         .pr_type = SOCK_RAW,
 243         .pr_domain = &inetdomain,
 244         .pr_protocol = IPPROTO_IGMP,
 245         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 246
 247         .pr_input = igmp_input,
 248         .pr_output = NULL,
 249         .pr_ctlinput = NULL,
 250         .pr_ctloutput = rip_ctloutput,
 251
 252         .pr_init = igmp_init,
 253         .pr_fasttimo = igmp_fasttimo,
 254         .pr_slowtimo = igmp_slowtimo,
 255         .pr_drain = NULL,
 256         .pr_usrreqs = &rip_usrreqs
 257     },
 258     {
 259         .pr_type = SOCK_RAW,
 260         .pr_domain = &inetdomain,
 261         .pr_protocol = IPPROTO_RSVP,
 262         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 263
 264         .pr_input = rsvp_input,
 265         .pr_output = NULL,
 266         .pr_ctlinput = NULL,
 267         .pr_ctloutput = rip_ctloutput,
 268
 269         .pr_usrreqs = &rip_usrreqs
 270     },
 271 #ifdef IPSEC
 272     {
 273         .pr_type = SOCK_RAW,
 274         .pr_domain = &inetdomain,
 275         .pr_protocol = IPPROTO_AH,
 276         .pr_flags = PR_ATOMIC|PR_ADDR,
 277
 278         .pr_input = ah4_input,
 279         .pr_output = NULL,
 280         .pr_ctlinput = NULL,
 281         .pr_ctloutput = NULL,
 282
 283         .pr_ctlport = NULL,
 284         .pr_usrreqs = &nousrreqs
 285     },
 286 #ifdef IPSEC_ESP
 287     {
 288         .pr_type = SOCK_RAW,
 289         .pr_domain = &inetdomain,
 290         .pr_protocol = IPPROTO_ESP,
 291         .pr_flags = PR_ATOMIC|PR_ADDR,
 292
 293         .pr_input = esp4_input,
 294         .pr_output = NULL,
 295         .pr_ctlinput = NULL,
 296         .pr_ctloutput = NULL,
 297
 298         .pr_ctlport = NULL,
 299         .pr_usrreqs = &nousrreqs
 300     },
 301 #endif
 302     {
 303         .pr_type = SOCK_RAW,
 304         .pr_domain = &inetdomain,
 305         .pr_protocol = IPPROTO_IPCOMP,
 306         .pr_flags = PR_ATOMIC|PR_ADDR,
 307
 308         .pr_input = ipcomp4_input,
 309         .pr_output = 0,
 310         .pr_ctlinput = NULL,
 311         .pr_ctloutput = NULL,
 312
 313         .pr_ctlport = NULL,
 314         .pr_usrreqs = &nousrreqs
 315     },
 316 #endif /* IPSEC */
 317 #ifdef FAST_IPSEC
 318     {
 319         .pr_type = SOCK_RAW,
 320         .pr_domain = &inetdomain,
 321         .pr_protocol = IPPROTO_AH,
 322         .pr_flags = PR_ATOMIC|PR_ADDR,
 323
 324         .pr_input = ipsec4_common_input,
 325         .pr_output = NULL,
 326         .pr_ctlinput = NULL,
 327         .pr_ctloutput = NULL,
 328
 329         .pr_ctlport = NULL,
 330         .pr_usrreqs = &nousrreqs
 331     },
 332     {
 333         .pr_type = SOCK_RAW,
 334         .pr_domain = &inetdomain,
 335         .pr_protocol = IPPROTO_ESP,
 336         .pr_flags = PR_ATOMIC|PR_ADDR,
 337
 338         .pr_input = ipsec4_common_input,
 339         .pr_output = NULL
 340         .pr_ctlinput = NULL,
 341         .pr_ctloutput = NULL,
 342
 343         .pr_ctlport = NULL,
 344         .pr_usrreqs = &nousrreqs
 345     },
 346     {
 347         .pr_type = SOCK_RAW,
 348         .pr_domain = &inetdomain,
 349         .pr_protocol = IPPROTO_IPCOMP,
 350         .pr_flags = PR_ATOMIC|PR_ADDR,
 351
 352         .pr_input = ipsec4_common_input,
 353         .pr_output = NULL,
 354         .pr_ctlinput = NULL,
 355         .pr_ctloutput = NULL,
 356
 357         .pr_ctlport = NULL,
 358         .pr_usrreqs = &nousrreqs
 359     },
 360 #endif /* FAST_IPSEC */
 361     {
 362         .pr_type = SOCK_RAW,
 363         .pr_domain = &inetdomain,
 364         .pr_protocol = IPPROTO_IPV4,
 365         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 366         .pr_input = encap4_input,
 367         .pr_output = NULL,
 368         .pr_ctlinput = NULL,
 369         .pr_ctloutput = rip_ctloutput,
 370
 371         .pr_ctlport = NULL,
 372         .pr_init = encap_init,
 373         .pr_usrreqs = &rip_usrreqs
 374     },
 375     {
 376         .pr_type = SOCK_RAW,
 377         .pr_domain = &inetdomain,
 378         .pr_protocol = IPPROTO_MOBILE,
 379         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 380
 381         .pr_input = encap4_input,
 382         .pr_output = NULL,
 383         .pr_ctlinput = NULL,
 384         .pr_ctloutput = rip_ctloutput,
 385
 386         .pr_ctlport = NULL,
 387         .pr_init = encap_init,
 388         .pr_usrreqs = &rip_usrreqs
 389     },
 390     {
 391         .pr_type = SOCK_RAW,
 392         .pr_domain = &inetdomain,
 393         .pr_protocol = IPPROTO_GRE,
 394         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 395
 396         .pr_input = encap4_input,
 397         .pr_output = NULL,
 398         .pr_ctlinput = NULL,
 399         .pr_ctloutput = rip_ctloutput,
 400
 401         .pr_ctlport = NULL,
 402         .pr_init = encap_init,
 403         .pr_usrreqs = &rip_usrreqs
 404     },
 405 #ifdef INET6
 406     {
 407         .pr_type = SOCK_RAW,
 408         .pr_domain = &inetdomain,
 409         .pr_protocol = IPPROTO_IPV6,
 410         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 411
 412         .pr_input = encap4_input,
 413         .pr_output = NULL,
 414         .pr_ctlinput = NULL,
 415         .pr_ctloutput = rip_ctloutput,
 416
 417         .pr_ctlport = NULL,
 418         .pr_init = encap_init,
 419         .pr_usrreqs = &rip_usrreqs
 420     },
 421 #endif
 422 #ifdef IPDIVERT
 423     {
 424         .pr_type = SOCK_RAW,
 425         .pr_domain = &inetdomain,
 426         .pr_protocol = IPPROTO_DIVERT,
 427         .pr_flags = PR_ATOMIC|PR_ADDR,
 428
 429         .pr_input = div_input,
 430         .pr_output = NULL,
 431         .pr_ctlinput = NULL,
 432         .pr_ctloutput = ip_ctloutput,
 433
 434         .pr_ctlport = NULL,
 435         .pr_init = div_init,
 436         .pr_usrreqs = &div_usrreqs
 437     },
 438 #endif
 439 #ifdef IPXIP
 440     {
 441         .pr_type = SOCK_RAW,
 442         .pr_domain = &inetdomain,
 443         .pr_protocol = IPPROTO_IDP,
 444         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 445
 446         .pr_input = ipxip_input,
 447         .pr_output = NULL,
 448         .pr_ctlinput = ipxip_ctlinput,
 449         .pr_ctloutput = NULL,
 450
 451         .pr_ctlport = cpu0_ctlport,
 452         .pr_usrreqs = &rip_usrreqs
 453     },
 454 #endif
 455 #ifdef PIM
 456     {
 457         .pr_type = SOCK_RAW,
 458         .pr_domain = &inetdomain,
 459         .pr_protocol = IPPROTO_PIM,
 460         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 461
 462         .pr_input = pim_input,
 463         .pr_output = NULL,
 464         .pr_ctlinput = NULL,
 465         .pr_ctloutput = rip_ctloutput,
 466
 467         .pr_ctlport = NULL,
 468         .pr_usrreqs = &rip_usrreqs
 469     },
 470 #endif
 471 #ifdef NPFSYNC
 472     {
 473         .pr_type = SOCK_RAW,
 474         .pr_domain = &inetdomain,
 475         .pr_protocol = IPPROTO_PFSYNC,
 476         .pr_flags = PR_ATOMIC|PR_ADDR,
 477
 478         .pr_input = pfsync_input,
 479         .pr_output = NULL,
 480         .pr_ctlinput = NULL,
 481         .pr_ctloutput = rip_ctloutput,
 482
 483         .pr_ctlport = NULL,
 484         .pr_usrreqs = &rip_usrreqs
 485     },
 486 #endif  /* NPFSYNC */
 487     {
 488         /* raw wildcard */
 489         .pr_type = SOCK_RAW,
 490         .pr_domain = &inetdomain,
 491         .pr_protocol = 0,
 492         .pr_flags = PR_ATOMIC|PR_ADDR,
 493
 494         .pr_input = rip_input,
 495         .pr_output = NULL,
 496         .pr_ctlinput = NULL,
 497         .pr_ctloutput = rip_ctloutput,
 498
 499         .pr_init = rip_init,
 500         .pr_ctlport = NULL,
 501         .pr_usrreqs = &rip_usrreqs
 502     },
 503 #ifdef CARP
 504     {
 505         .pr_type = SOCK_RAW,
 506         .pr_domain = &inetdomain,
 507         .pr_protocol = IPPROTO_CARP,
 508         .pr_flags = PR_ATOMIC|PR_ADDR|PR_MPSAFE,
 509
 510         .pr_input = carp_proto_input,
 511         .pr_output = rip_output,
 512         .pr_ctlinput = carp_proto_ctlinput,
 513         .pr_ctloutput = rip_ctloutput,
 514
 515         .pr_ctlport = cpu0_ctlport,
 516         .pr_usrreqs = &rip_usrreqs
 517     },
 518 #endif
 519 };
 520
 521 struct domain inetdomain = {
 522         AF_INET, "internet", NULL, NULL, NULL,
 523         inetsw, &inetsw[NELEM(inetsw)],
 524         SLIST_ENTRY_INITIALIZER,
 525         in_inithead, 32, sizeof(struct sockaddr_in),
 526 };
 527
 528 DOMAIN_SET(inet);
 529
 530 SYSCTL_NODE(_net,      PF_INET,         inet,   CTLFLAG_RW, 0,
 531         "Internet Family");
 532
 533 SYSCTL_NODE(_net_inet, IPPROTO_IP,      ip,     CTLFLAG_RW, 0,  "IP");
 534 SYSCTL_NODE(_net_inet, IPPROTO_ICMP,    icmp,   CTLFLAG_RW, 0,  "ICMP");
 535 SYSCTL_NODE(_net_inet, IPPROTO_UDP,     udp,    CTLFLAG_RW, 0,  "UDP");
 536 SYSCTL_NODE(_net_inet, IPPROTO_TCP,     tcp,    CTLFLAG_RW, 0,  "TCP");
 537 SYSCTL_NODE(_net_inet, IPPROTO_IGMP,    igmp,   CTLFLAG_RW, 0,  "IGMP");
 538 #ifdef FAST_IPSEC
 539 /* XXX no protocol # to use, pick something "reserved" */
 540 SYSCTL_NODE(_net_inet, 253,             ipsec,  CTLFLAG_RW, 0,  "IPSEC");
 541 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ah,     CTLFLAG_RW, 0,  "AH");
 542 SYSCTL_NODE(_net_inet, IPPROTO_ESP,     esp,    CTLFLAG_RW, 0,  "ESP");
 543 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP,  ipcomp, CTLFLAG_RW, 0,  "IPCOMP");
 544 SYSCTL_NODE(_net_inet, IPPROTO_IPIP,    ipip,   CTLFLAG_RW, 0,  "IPIP");
 545 #else
 546 #ifdef IPSEC
 547 SYSCTL_NODE(_net_inet, IPPROTO_AH,      ipsec,  CTLFLAG_RW, 0,  "IPSEC");
 548 #endif /* IPSEC */
 549 #endif /* !FAST_IPSEC */
 550 SYSCTL_NODE(_net_inet, IPPROTO_RAW,     raw,    CTLFLAG_RW, 0,  "RAW");
 551 #ifdef IPDIVERT
 552 SYSCTL_NODE(_net_inet, IPPROTO_DIVERT,  divert, CTLFLAG_RW, 0,  "DIVERT");
 553 #endif
 554 #ifdef PIM
 555 SYSCTL_NODE(_net_inet, IPPROTO_PIM,    pim,    CTLFLAG_RW, 0,  "PIM");
 556 #endif
 557 #ifdef CARP
 558 SYSCTL_NODE(_net_inet, IPPROTO_CARP,    carp,    CTLFLAG_RW, 0,  "CARP");
 559 #endif