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 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 #include <sys/socket.h> 48 #include <sys/domain.h> 49 #include <sys/proc.h> 50 #include <sys/protosw.h> 51 #include <sys/queue.h> 52 #include <sys/sysctl.h> 53 54 /* 55 * While this file provides the domain and protocol switch tables for IPv4, it 56 * also provides the sysctl node declarations for net.inet.* often shared with 57 * IPv6 for common features or by upper layer protocols. In case of no IPv4 58 * support compile out everything but these sysctl nodes. 59 */ 60 #ifdef INET 61 #include <net/if.h> 62 #include <net/if_var.h> 63 #include <net/route.h> 64 #include <net/vnet.h> 65 #endif /* INET */ 66 67 #if defined(INET) || defined(INET6) 68 #include <netinet/in.h> 69 #endif 70 71 #ifdef INET 72 #include <netinet/in_systm.h> 73 #include <netinet/in_var.h> 74 #include <netinet/ip.h> 75 #include <netinet/ip_var.h> 76 #include <netinet/ip_icmp.h> 77 #include <netinet/igmp_var.h> 78 #include <netinet/tcp.h> 79 #include <netinet/tcp_timer.h> 80 #include <netinet/tcp_var.h> 81 #include <netinet/udp.h> 82 #include <netinet/udp_var.h> 83 #include <netinet/ip_encap.h> 84 85 /* 86 * TCP/IP protocol family: IP, ICMP, UDP, TCP. 87 */ 88 89 static struct pr_usrreqs nousrreqs; 90 91 #ifdef SCTP 92 #include <netinet/in_pcb.h> 93 #include <netinet/sctp_pcb.h> 94 #include <netinet/sctp.h> 95 #include <netinet/sctp_var.h> 96 #endif 97 98 FEATURE(inet, "Internet Protocol version 4"); 99 100 extern struct domain inetdomain; 101 102 /* Spacer for loadable protocols. */ 103 #define IPPROTOSPACER \ 104 { \ 105 .pr_domain = &inetdomain, \ 106 .pr_protocol = PROTO_SPACER, \ 107 .pr_usrreqs = &nousrreqs \ 108 } 109 110 struct protosw inetsw[] = { 111 { 112 .pr_type = 0, 113 .pr_domain = &inetdomain, 114 .pr_protocol = IPPROTO_IP, 115 .pr_flags = PR_CAPATTACH, 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|PR_CAPATTACH, 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_CAPATTACH, 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 = NULL, /* Covered by the SOCK_SEQPACKET entry. */ 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|PR_CAPATTACH, 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_usrreqs = &rip_usrreqs 229 }, 230 { 231 .pr_type = SOCK_RAW, 232 .pr_domain = &inetdomain, 233 .pr_protocol = IPPROTO_MOBILE, 234 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 235 .pr_input = encap4_input, 236 .pr_ctloutput = rip_ctloutput, 237 .pr_usrreqs = &rip_usrreqs 238 }, 239 { 240 .pr_type = SOCK_RAW, 241 .pr_domain = &inetdomain, 242 .pr_protocol = IPPROTO_ETHERIP, 243 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 244 .pr_input = encap4_input, 245 .pr_ctloutput = rip_ctloutput, 246 .pr_usrreqs = &rip_usrreqs 247 }, 248 { 249 .pr_type = SOCK_RAW, 250 .pr_domain = &inetdomain, 251 .pr_protocol = IPPROTO_GRE, 252 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 253 .pr_input = encap4_input, 254 .pr_ctloutput = rip_ctloutput, 255 .pr_usrreqs = &rip_usrreqs 256 }, 257 # ifdef INET6 258 { 259 .pr_type = SOCK_RAW, 260 .pr_domain = &inetdomain, 261 .pr_protocol = IPPROTO_IPV6, 262 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 263 .pr_input = encap4_input, 264 .pr_ctloutput = rip_ctloutput, 265 .pr_usrreqs = &rip_usrreqs 266 }, 267 #endif 268 { 269 .pr_type = SOCK_RAW, 270 .pr_domain = &inetdomain, 271 .pr_protocol = IPPROTO_PIM, 272 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 273 .pr_input = encap4_input, 274 .pr_ctloutput = rip_ctloutput, 275 .pr_usrreqs = &rip_usrreqs 276 }, 277 /* Spacer n-times for loadable protocols. */ 278 IPPROTOSPACER, 279 IPPROTOSPACER, 280 IPPROTOSPACER, 281 IPPROTOSPACER, 282 IPPROTOSPACER, 283 IPPROTOSPACER, 284 IPPROTOSPACER, 285 IPPROTOSPACER, 286 /* raw wildcard */ 287 { 288 .pr_type = SOCK_RAW, 289 .pr_domain = &inetdomain, 290 .pr_flags = PR_ATOMIC|PR_ADDR, 291 .pr_input = rip_input, 292 .pr_ctloutput = rip_ctloutput, 293 .pr_init = rip_init, 294 .pr_usrreqs = &rip_usrreqs 295 }, 296 }; 297 298 struct domain inetdomain = { 299 .dom_family = AF_INET, 300 .dom_name = "internet", 301 .dom_protosw = inetsw, 302 .dom_protoswNPROTOSW = &inetsw[nitems(inetsw)], 303 .dom_rtattach = in_inithead, 304 #ifdef VIMAGE 305 .dom_rtdetach = in_detachhead, 306 #endif 307 .dom_ifattach = in_domifattach, 308 .dom_ifdetach = in_domifdetach 309 }; 310 311 VNET_DOMAIN_SET(inet); 312 #endif /* INET */ 313 314 SYSCTL_NODE(_net, PF_INET, inet, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 315 "Internet Family"); 316 317 SYSCTL_NODE(_net_inet, IPPROTO_IP, ip, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 318 "IP"); 319 SYSCTL_NODE(_net_inet, IPPROTO_ICMP, icmp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 320 "ICMP"); 321 SYSCTL_NODE(_net_inet, IPPROTO_UDP, udp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 322 "UDP"); 323 SYSCTL_NODE(_net_inet, IPPROTO_TCP, tcp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 324 "TCP"); 325 #if defined(SCTP) || defined(SCTP_SUPPORT) 326 SYSCTL_NODE(_net_inet, IPPROTO_SCTP, sctp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 327 "SCTP"); 328 #endif 329 SYSCTL_NODE(_net_inet, IPPROTO_IGMP, igmp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 330 "IGMP"); 331 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 332 /* XXX no protocol # to use, pick something "reserved" */ 333 SYSCTL_NODE(_net_inet, 253, ipsec, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 334 "IPSEC"); 335 SYSCTL_NODE(_net_inet, IPPROTO_AH, ah, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 336 "AH"); 337 SYSCTL_NODE(_net_inet, IPPROTO_ESP, esp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 338 "ESP"); 339 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP, ipcomp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 340 "IPCOMP"); 341 SYSCTL_NODE(_net_inet, IPPROTO_IPIP, ipip, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 342 "IPIP"); 343 #endif /* IPSEC */ 344 SYSCTL_NODE(_net_inet, IPPROTO_RAW, raw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 345 "RAW"); 346 SYSCTL_NODE(_net_inet, OID_AUTO, accf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 347 "Accept filters"); 348