sys/netinet/in_proto.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1982, 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)in_proto.c  8.2 (Berkeley) 2/9/95
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include "opt_mrouting.h"
  38 #include "opt_ipsec.h"
  39 #include "opt_inet.h"
  40 #include "opt_inet6.h"
  41 #include "opt_sctp.h"
  42 #include "opt_mpath.h"
  43
  44 #include <sys/param.h>
  45 #include <sys/systm.h>
  46 #include <sys/kernel.h>
  47 #include <sys/malloc.h>
  48 #include <sys/socket.h>
  49 #include <sys/domain.h>
  50 #include <sys/proc.h>
  51 #include <sys/protosw.h>
  52 #include <sys/queue.h>
  53 #include <sys/sysctl.h>
  54
  55 /*
  56  * While this file provides the domain and protocol switch tables for IPv4, it
  57  * also provides the sysctl node declarations for net.inet.* often shared with
  58  * IPv6 for common features or by upper layer protocols.  In case of no IPv4
  59  * support compile out everything but these sysctl nodes.
  60  */
  61 #ifdef INET
  62 #include <net/if.h>
  63 #include <net/if_var.h>
  64 #include <net/route.h>
  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 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
  98
  99 FEATURE(inet, "Internet Protocol version 4");
 100
 101 extern  struct domain inetdomain;
 102
 103 /* Spacer for loadable protocols. */
 104 #define IPPROTOSPACER                           \
 105 {                                               \
 106         .pr_domain =            &inetdomain,    \
 107         .pr_protocol =          PROTO_SPACER,   \
 108         .pr_usrreqs =           &nousrreqs      \
 109 }
 110
 111 struct protosw inetsw[] = {
 112 {
 113         .pr_type =              0,
 114         .pr_domain =            &inetdomain,
 115         .pr_protocol =          IPPROTO_IP,
 116         .pr_init =              ip_init,
 117         .pr_slowtimo =          ip_slowtimo,
 118         .pr_drain =             ip_drain,
 119         .pr_usrreqs =           &nousrreqs
 120 },
 121 {
 122         .pr_type =              SOCK_DGRAM,
 123         .pr_domain =            &inetdomain,
 124         .pr_protocol =          IPPROTO_UDP,
 125         .pr_flags =             PR_ATOMIC|PR_ADDR,
 126         .pr_input =             udp_input,
 127         .pr_ctlinput =          udp_ctlinput,
 128         .pr_ctloutput =         udp_ctloutput,
 129         .pr_init =              udp_init,
 130         .pr_usrreqs =           &udp_usrreqs
 131 },
 132 {
 133         .pr_type =              SOCK_STREAM,
 134         .pr_domain =            &inetdomain,
 135         .pr_protocol =          IPPROTO_TCP,
 136         .pr_flags =             PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
 137         .pr_input =             tcp_input,
 138         .pr_ctlinput =          tcp_ctlinput,
 139         .pr_ctloutput =         tcp_ctloutput,
 140         .pr_init =              tcp_init,
 141         .pr_slowtimo =          tcp_slowtimo,
 142         .pr_drain =             tcp_drain,
 143         .pr_usrreqs =           &tcp_usrreqs
 144 },
 145 #ifdef SCTP
 146 {
 147         .pr_type =              SOCK_SEQPACKET,
 148         .pr_domain =            &inetdomain,
 149         .pr_protocol =          IPPROTO_SCTP,
 150         .pr_flags =             PR_WANTRCVD|PR_LASTHDR,
 151         .pr_input =             sctp_input,
 152         .pr_ctlinput =          sctp_ctlinput,
 153         .pr_ctloutput =         sctp_ctloutput,
 154         .pr_init =              sctp_init,
 155         .pr_drain =             sctp_drain,
 156         .pr_usrreqs =           &sctp_usrreqs
 157 },
 158 {
 159         .pr_type =              SOCK_STREAM,
 160         .pr_domain =            &inetdomain,
 161         .pr_protocol =          IPPROTO_SCTP,
 162         .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_LASTHDR,
 163         .pr_input =             sctp_input,
 164         .pr_ctlinput =          sctp_ctlinput,
 165         .pr_ctloutput =         sctp_ctloutput,
 166         .pr_drain =             NULL, /* Covered by the SOCK_SEQPACKET entry. */
 167         .pr_usrreqs =           &sctp_usrreqs
 168 },
 169 #endif /* SCTP */
 170 {
 171         .pr_type =              SOCK_DGRAM,
 172         .pr_domain =            &inetdomain,
 173         .pr_protocol =          IPPROTO_UDPLITE,
 174         .pr_flags =             PR_ATOMIC|PR_ADDR,
 175         .pr_input =             udp_input,
 176         .pr_ctlinput =          udplite_ctlinput,
 177         .pr_ctloutput =         udp_ctloutput,
 178         .pr_init =              udplite_init,
 179         .pr_usrreqs =           &udp_usrreqs
 180 },
 181 {
 182         .pr_type =              SOCK_RAW,
 183         .pr_domain =            &inetdomain,
 184         .pr_protocol =          IPPROTO_RAW,
 185         .pr_flags =             PR_ATOMIC|PR_ADDR,
 186         .pr_input =             rip_input,
 187         .pr_ctlinput =          rip_ctlinput,
 188         .pr_ctloutput =         rip_ctloutput,
 189         .pr_usrreqs =           &rip_usrreqs
 190 },
 191 {
 192         .pr_type =              SOCK_RAW,
 193         .pr_domain =            &inetdomain,
 194         .pr_protocol =          IPPROTO_ICMP,
 195         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 196         .pr_input =             icmp_input,
 197         .pr_ctloutput =         rip_ctloutput,
 198         .pr_usrreqs =           &rip_usrreqs
 199 },
 200 {
 201         .pr_type =              SOCK_RAW,
 202         .pr_domain =            &inetdomain,
 203         .pr_protocol =          IPPROTO_IGMP,
 204         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 205         .pr_input =             igmp_input,
 206         .pr_ctloutput =         rip_ctloutput,
 207         .pr_fasttimo =          igmp_fasttimo,
 208         .pr_slowtimo =          igmp_slowtimo,
 209         .pr_usrreqs =           &rip_usrreqs
 210 },
 211 {
 212         .pr_type =              SOCK_RAW,
 213         .pr_domain =            &inetdomain,
 214         .pr_protocol =          IPPROTO_RSVP,
 215         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 216         .pr_input =             rsvp_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_IPV4,
 224         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 225         .pr_input =             encap4_input,
 226         .pr_ctloutput =         rip_ctloutput,
 227         .pr_usrreqs =           &rip_usrreqs
 228 },
 229 {
 230         .pr_type =              SOCK_RAW,
 231         .pr_domain =            &inetdomain,
 232         .pr_protocol =          IPPROTO_MOBILE,
 233         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 234         .pr_input =             encap4_input,
 235         .pr_ctloutput =         rip_ctloutput,
 236         .pr_usrreqs =           &rip_usrreqs
 237 },
 238 {
 239         .pr_type =              SOCK_RAW,
 240         .pr_domain =            &inetdomain,
 241         .pr_protocol =          IPPROTO_ETHERIP,
 242         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 243         .pr_input =             encap4_input,
 244         .pr_ctloutput =         rip_ctloutput,
 245         .pr_usrreqs =           &rip_usrreqs
 246 },
 247 {
 248         .pr_type =              SOCK_RAW,
 249         .pr_domain =            &inetdomain,
 250         .pr_protocol =          IPPROTO_GRE,
 251         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 252         .pr_input =             encap4_input,
 253         .pr_ctloutput =         rip_ctloutput,
 254         .pr_usrreqs =           &rip_usrreqs
 255 },
 256 # ifdef INET6
 257 {
 258         .pr_type =              SOCK_RAW,
 259         .pr_domain =            &inetdomain,
 260         .pr_protocol =          IPPROTO_IPV6,
 261         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 262         .pr_input =             encap4_input,
 263         .pr_ctloutput =         rip_ctloutput,
 264         .pr_usrreqs =           &rip_usrreqs
 265 },
 266 #endif
 267 {
 268         .pr_type =              SOCK_RAW,
 269         .pr_domain =            &inetdomain,
 270         .pr_protocol =          IPPROTO_PIM,
 271         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 272         .pr_input =             encap4_input,
 273         .pr_ctloutput =         rip_ctloutput,
 274         .pr_usrreqs =           &rip_usrreqs
 275 },
 276 /* Spacer n-times for loadable protocols. */
 277 IPPROTOSPACER,
 278 IPPROTOSPACER,
 279 IPPROTOSPACER,
 280 IPPROTOSPACER,
 281 IPPROTOSPACER,
 282 IPPROTOSPACER,
 283 IPPROTOSPACER,
 284 IPPROTOSPACER,
 285 /* raw wildcard */
 286 {
 287         .pr_type =              SOCK_RAW,
 288         .pr_domain =            &inetdomain,
 289         .pr_flags =             PR_ATOMIC|PR_ADDR,
 290         .pr_input =             rip_input,
 291         .pr_ctloutput =         rip_ctloutput,
 292         .pr_init =              rip_init,
 293         .pr_usrreqs =           &rip_usrreqs
 294 },
 295 };
 296
 297 extern int in_inithead(void **, int, u_int);
 298 extern int in_detachhead(void **, int);
 299
 300 struct domain inetdomain = {
 301         .dom_family =           AF_INET,
 302         .dom_name =             "internet",
 303         .dom_protosw =          inetsw,
 304         .dom_protoswNPROTOSW =  &inetsw[nitems(inetsw)],
 305         .dom_rtattach =         in_inithead,
 306 #ifdef VIMAGE
 307         .dom_rtdetach =         in_detachhead,
 308 #endif
 309         .dom_ifattach =         in_domifattach,
 310         .dom_ifdetach =         in_domifdetach
 311 };
 312
 313 VNET_DOMAIN_SET(inet);
 314 #endif /* INET */
 315
 316 SYSCTL_NODE(_net, PF_INET, inet, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 317     "Internet Family");
 318
 319 SYSCTL_NODE(_net_inet, IPPROTO_IP, ip, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 320     "IP");
 321 SYSCTL_NODE(_net_inet, IPPROTO_ICMP, icmp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 322     "ICMP");
 323 SYSCTL_NODE(_net_inet, IPPROTO_UDP, udp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 324     "UDP");
 325 SYSCTL_NODE(_net_inet, IPPROTO_TCP, tcp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 326     "TCP");
 327 #if defined(SCTP) || defined(SCTP_SUPPORT)
 328 SYSCTL_NODE(_net_inet, IPPROTO_SCTP, sctp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 329     "SCTP");
 330 #endif
 331 SYSCTL_NODE(_net_inet, IPPROTO_IGMP, igmp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 332     "IGMP");
 333 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 334 /* XXX no protocol # to use, pick something "reserved" */
 335 SYSCTL_NODE(_net_inet, 253, ipsec, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 336     "IPSEC");
 337 SYSCTL_NODE(_net_inet, IPPROTO_AH, ah, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 338     "AH");
 339 SYSCTL_NODE(_net_inet, IPPROTO_ESP, esp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 340     "ESP");
 341 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP, ipcomp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 342     "IPCOMP");
 343 SYSCTL_NODE(_net_inet, IPPROTO_IPIP, ipip, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 344     "IPIP");
 345 #endif /* IPSEC */
 346 SYSCTL_NODE(_net_inet, IPPROTO_RAW, raw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 347     "RAW");
 348 SYSCTL_NODE(_net_inet, OID_AUTO, accf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 349     "Accept filters");