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