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 struct domain inetdomain = { 298 .dom_family = AF_INET, 299 .dom_name = "internet", 300 .dom_protosw = inetsw, 301 .dom_protoswNPROTOSW = &inetsw[nitems(inetsw)], 302 .dom_rtattach = in_inithead, 303 #ifdef VIMAGE 304 .dom_rtdetach = in_detachhead, 305 #endif 306 .dom_ifattach = in_domifattach, 307 .dom_ifdetach = in_domifdetach 308 }; 309 310 VNET_DOMAIN_SET(inet); 311 #endif /* INET */ 312 313 SYSCTL_NODE(_net, PF_INET, inet, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 314 "Internet Family"); 315 316 SYSCTL_NODE(_net_inet, IPPROTO_IP, ip, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 317 "IP"); 318 SYSCTL_NODE(_net_inet, IPPROTO_ICMP, icmp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 319 "ICMP"); 320 SYSCTL_NODE(_net_inet, IPPROTO_UDP, udp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 321 "UDP"); 322 SYSCTL_NODE(_net_inet, IPPROTO_TCP, tcp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 323 "TCP"); 324 #if defined(SCTP) || defined(SCTP_SUPPORT) 325 SYSCTL_NODE(_net_inet, IPPROTO_SCTP, sctp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 326 "SCTP"); 327 #endif 328 SYSCTL_NODE(_net_inet, IPPROTO_IGMP, igmp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 329 "IGMP"); 330 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 331 /* XXX no protocol # to use, pick something "reserved" */ 332 SYSCTL_NODE(_net_inet, 253, ipsec, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 333 "IPSEC"); 334 SYSCTL_NODE(_net_inet, IPPROTO_AH, ah, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 335 "AH"); 336 SYSCTL_NODE(_net_inet, IPPROTO_ESP, esp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 337 "ESP"); 338 SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP, ipcomp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 339 "IPCOMP"); 340 SYSCTL_NODE(_net_inet, IPPROTO_IPIP, ipip, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 341 "IPIP"); 342 #endif /* IPSEC */ 343 SYSCTL_NODE(_net_inet, IPPROTO_RAW, raw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 344 "RAW"); 345 SYSCTL_NODE(_net_inet, OID_AUTO, accf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 346 "Accept filters"); 347