1 /* 2 * Copyright (c) 2004 Jeffrey Hsu. All rights reserved. 3 * Copyright (c) 1982, 1986, 1991, 1993, 1995 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 35 * $FreeBSD: src/sys/netinet/in_pcb.c,v 1.59.2.27 2004/01/02 04:06:42 ambrisko Exp $ 36 * $DragonFly: src/sys/netinet/in_pcb.c,v 1.17 2004/04/10 00:10:42 hsu Exp $ 37 */ 38 39 #include "opt_ipsec.h" 40 #include "opt_inet6.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/domain.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/proc.h> 51 #include <sys/jail.h> 52 #include <sys/kernel.h> 53 #include <sys/sysctl.h> 54 55 #include <machine/limits.h> 56 57 #include <vm/vm_zone.h> 58 59 #include <net/if.h> 60 #include <net/if_types.h> 61 #include <net/route.h> 62 63 #include <netinet/in.h> 64 #include <netinet/in_pcb.h> 65 #include <netinet/in_var.h> 66 #include <netinet/ip_var.h> 67 #ifdef INET6 68 #include <netinet/ip6.h> 69 #include <netinet6/ip6_var.h> 70 #endif /* INET6 */ 71 72 #ifdef IPSEC 73 #include <netinet6/ipsec.h> 74 #include <netproto/key/key.h> 75 #endif 76 77 #ifdef FAST_IPSEC 78 #if defined(IPSEC) || defined(IPSEC_ESP) 79 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!" 80 #endif 81 82 #include <netipsec/ipsec.h> 83 #include <netipsec/key.h> 84 #define IPSEC 85 #endif /* FAST_IPSEC */ 86 87 struct in_addr zeroin_addr; 88 89 /* 90 * These configure the range of local port addresses assigned to 91 * "unspecified" outgoing connections/packets/whatever. 92 */ 93 int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */ 94 int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */ 95 96 int ipport_firstauto = IPPORT_RESERVED; /* 1024 */ 97 int ipport_lastauto = IPPORT_USERRESERVED; /* 5000 */ 98 99 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 49152 */ 100 int ipport_hilastauto = IPPORT_HILASTAUTO; /* 65535 */ 101 102 static __inline void 103 RANGECHK(int var, int min, int max) 104 { 105 if (var < min) 106 var = min; 107 else if (var > max) 108 var = max; 109 } 110 111 static int 112 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS) 113 { 114 int error; 115 116 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 117 if (!error) { 118 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1); 119 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1); 120 121 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX); 122 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX); 123 124 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX); 125 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX); 126 } 127 return (error); 128 } 129 130 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports"); 131 132 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW, 133 &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", ""); 134 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW, 135 &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", ""); 136 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW, 137 &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", ""); 138 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW, 139 &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", ""); 140 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW, 141 &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", ""); 142 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW, 143 &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", ""); 144 145 /* 146 * in_pcb.c: manage the Protocol Control Blocks. 147 * 148 * NOTE: It is assumed that most of these functions will be called at 149 * splnet(). XXX - There are, unfortunately, a few exceptions to this 150 * rule that should be fixed. 151 */ 152 153 /* 154 * Allocate a PCB and associate it with the socket. 155 */ 156 int 157 in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo) 158 { 159 struct inpcb *inp; 160 #ifdef IPSEC 161 int error; 162 #endif 163 164 inp = zalloc(pcbinfo->ipi_zone); 165 if (inp == NULL) 166 return (ENOBUFS); 167 bzero((caddr_t)inp, sizeof *inp); 168 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 169 inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo; 170 inp->inp_socket = so; 171 #ifdef IPSEC 172 error = ipsec_init_policy(so, &inp->inp_sp); 173 if (error != 0) { 174 zfree(pcbinfo->ipi_zone, inp); 175 return (error); 176 } 177 #endif 178 #ifdef INET6 179 if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only) 180 inp->inp_flags |= IN6P_IPV6_V6ONLY; 181 if (ip6_auto_flowlabel) 182 inp->inp_flags |= IN6P_AUTOFLOWLABEL; 183 #endif 184 so->so_pcb = (caddr_t)inp; 185 LIST_INSERT_HEAD(&pcbinfo->listhead, inp, inp_list); 186 pcbinfo->ipi_count++; 187 return (0); 188 } 189 190 int 191 in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 192 { 193 struct socket *so = inp->inp_socket; 194 struct proc *p = td->td_proc; 195 unsigned short *lastport; 196 struct sockaddr_in *sin; 197 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 198 u_short lport = 0; 199 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 200 int error, prison = 0; 201 202 KKASSERT(p); 203 204 if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */ 205 return (EADDRNOTAVAIL); 206 if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY) 207 return (EINVAL); /* already bound */ 208 if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT))) 209 wild = 1; /* neither SO_REUSEADDR nor SO_REUSEPORT is set */ 210 if (nam != NULL) { 211 sin = (struct sockaddr_in *)nam; 212 if (nam->sa_len != sizeof *sin) 213 return (EINVAL); 214 #ifdef notdef 215 /* 216 * We should check the family, but old programs 217 * incorrectly fail to initialize it. 218 */ 219 if (sin->sin_family != AF_INET) 220 return (EAFNOSUPPORT); 221 #endif 222 if (sin->sin_addr.s_addr != INADDR_ANY && 223 prison_ip(td, 0, &sin->sin_addr.s_addr)) 224 return (EINVAL); 225 lport = sin->sin_port; 226 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 227 /* 228 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 229 * allow complete duplication of binding if 230 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 231 * and a multicast address is bound on both 232 * new and duplicated sockets. 233 */ 234 if (so->so_options & SO_REUSEADDR) 235 reuseport = SO_REUSEADDR | SO_REUSEPORT; 236 } else if (sin->sin_addr.s_addr != INADDR_ANY) { 237 sin->sin_port = 0; /* yech... */ 238 bzero(&sin->sin_zero, sizeof sin->sin_zero); 239 if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL) 240 return (EADDRNOTAVAIL); 241 } 242 if (lport != 0) { 243 struct inpcb *t; 244 245 /* GROSS */ 246 if (ntohs(lport) < IPPORT_RESERVED && 247 p && suser_cred(p->p_ucred, PRISON_ROOT)) 248 return (EACCES); 249 if (p && p->p_ucred->cr_prison) 250 prison = 1; 251 if (so->so_cred->cr_uid != 0 && 252 !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 253 t = in_pcblookup_local(inp->inp_pcbinfo, 254 sin->sin_addr, lport, 255 prison ? 0 : INPLOOKUP_WILDCARD); 256 if (t && 257 (!in_nullhost(sin->sin_addr) || 258 !in_nullhost(t->inp_laddr) || 259 (t->inp_socket->so_options & 260 SO_REUSEPORT) == 0) && 261 (so->so_cred->cr_uid != 262 t->inp_socket->so_cred->cr_uid)) { 263 #ifdef INET6 264 if (!in_nullhost(sin->sin_addr) || 265 !in_nullhost(t->inp_laddr) || 266 INP_SOCKAF(so) == 267 INP_SOCKAF(t->inp_socket)) 268 #endif 269 return (EADDRINUSE); 270 } 271 } 272 if (prison && prison_ip(td, 0, &sin->sin_addr.s_addr)) 273 return (EADDRNOTAVAIL); 274 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 275 lport, prison ? 0 : wild); 276 if (t && !(reuseport & t->inp_socket->so_options)) { 277 #ifdef INET6 278 if (!in_nullhost(sin->sin_addr) || 279 !in_nullhost(t->inp_laddr) || 280 INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket)) 281 #endif 282 return (EADDRINUSE); 283 } 284 } 285 inp->inp_laddr = sin->sin_addr; 286 } 287 if (lport == 0) { 288 ushort first, last; 289 int count; 290 291 if (inp->inp_laddr.s_addr != INADDR_ANY && 292 prison_ip(td, 0, &inp->inp_laddr.s_addr )) { 293 inp->inp_laddr.s_addr = INADDR_ANY; 294 return (EINVAL); 295 } 296 inp->inp_flags |= INP_ANONPORT; 297 298 if (inp->inp_flags & INP_HIGHPORT) { 299 first = ipport_hifirstauto; /* sysctl */ 300 last = ipport_hilastauto; 301 lastport = &pcbinfo->lasthi; 302 } else if (inp->inp_flags & INP_LOWPORT) { 303 if (p && 304 (error = suser_cred(p->p_ucred, PRISON_ROOT))) { 305 inp->inp_laddr.s_addr = INADDR_ANY; 306 return (error); 307 } 308 first = ipport_lowfirstauto; /* 1023 */ 309 last = ipport_lowlastauto; /* 600 */ 310 lastport = &pcbinfo->lastlow; 311 } else { 312 first = ipport_firstauto; /* sysctl */ 313 last = ipport_lastauto; 314 lastport = &pcbinfo->lastport; 315 } 316 /* 317 * Simple check to ensure all ports are not used up causing 318 * a deadlock here. 319 * 320 * We split the two cases (up and down) so that the direction 321 * is not being tested on each round of the loop. 322 */ 323 if (first > last) { 324 /* 325 * counting down 326 */ 327 count = first - last; 328 329 do { 330 if (count-- < 0) { /* completely used? */ 331 inp->inp_laddr.s_addr = INADDR_ANY; 332 return (EADDRNOTAVAIL); 333 } 334 --*lastport; 335 if (*lastport > first || *lastport < last) 336 *lastport = first; 337 lport = htons(*lastport); 338 } while (in_pcblookup_local(pcbinfo, 339 inp->inp_laddr, lport, wild)); 340 } else { 341 /* 342 * counting up 343 */ 344 count = last - first; 345 346 do { 347 if (count-- < 0) { /* completely used? */ 348 inp->inp_laddr.s_addr = INADDR_ANY; 349 return (EADDRNOTAVAIL); 350 } 351 ++*lastport; 352 if (*lastport < first || *lastport > last) 353 *lastport = first; 354 lport = htons(*lastport); 355 } while (in_pcblookup_local(pcbinfo, 356 inp->inp_laddr, lport, wild)); 357 } 358 } 359 inp->inp_lport = lport; 360 if (prison_ip(td, 0, &inp->inp_laddr.s_addr)) { 361 inp->inp_laddr.s_addr = INADDR_ANY; 362 inp->inp_lport = 0; 363 return (EINVAL); 364 } 365 if (in_pcbinsporthash(inp) != 0) { 366 inp->inp_laddr.s_addr = INADDR_ANY; 367 inp->inp_lport = 0; 368 return (EAGAIN); 369 } 370 return (0); 371 } 372 373 /* 374 * Transform old in_pcbconnect() into an inner subroutine for new 375 * in_pcbconnect(): Do some validity-checking on the remote 376 * address (in mbuf 'nam') and then determine local host address 377 * (i.e., which interface) to use to access that remote host. 378 * 379 * This preserves definition of in_pcbconnect(), while supporting a 380 * slightly different version for T/TCP. (This is more than 381 * a bit of a kludge, but cleaning up the internal interfaces would 382 * have forced minor changes in every protocol). 383 */ 384 int 385 in_pcbladdr(inp, nam, plocal_sin) 386 struct inpcb *inp; 387 struct sockaddr *nam; 388 struct sockaddr_in **plocal_sin; 389 { 390 struct in_ifaddr *ia; 391 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 392 393 if (nam->sa_len != sizeof *sin) 394 return (EINVAL); 395 if (sin->sin_family != AF_INET) 396 return (EAFNOSUPPORT); 397 if (sin->sin_port == 0) 398 return (EADDRNOTAVAIL); 399 if (!TAILQ_EMPTY(&in_ifaddrhead)) { 400 ia = TAILQ_FIRST(&in_ifaddrhead); 401 /* 402 * If the destination address is INADDR_ANY, 403 * use the primary local address. 404 * If the supplied address is INADDR_BROADCAST, 405 * and the primary interface supports broadcast, 406 * choose the broadcast address for that interface. 407 */ 408 if (sin->sin_addr.s_addr == INADDR_ANY) 409 sin->sin_addr = IA_SIN(ia)->sin_addr; 410 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST && 411 (ia->ia_ifp->if_flags & IFF_BROADCAST)) 412 sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr; 413 } 414 if (inp->inp_laddr.s_addr == INADDR_ANY) { 415 struct route *ro; 416 417 ia = (struct in_ifaddr *)NULL; 418 /* 419 * If route is known or can be allocated now, 420 * our src addr is taken from the i/f, else punt. 421 * Note that we should check the address family of the cached 422 * destination, in case of sharing the cache with IPv6. 423 */ 424 ro = &inp->inp_route; 425 if (ro->ro_rt && 426 (!(ro->ro_rt->rt_flags & RTF_UP) || 427 ro->ro_dst.sa_family != AF_INET || 428 satosin(&ro->ro_dst)->sin_addr.s_addr != 429 sin->sin_addr.s_addr || 430 inp->inp_socket->so_options & SO_DONTROUTE)) { 431 RTFREE(ro->ro_rt); 432 ro->ro_rt = (struct rtentry *)NULL; 433 } 434 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ 435 (ro->ro_rt == (struct rtentry *)NULL || 436 ro->ro_rt->rt_ifp == (struct ifnet *)NULL)) { 437 /* No route yet, so try to acquire one */ 438 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 439 ro->ro_dst.sa_family = AF_INET; 440 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 441 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = 442 sin->sin_addr; 443 rtalloc(ro); 444 } 445 /* 446 * If we found a route, use the address 447 * corresponding to the outgoing interface 448 * unless it is the loopback (in case a route 449 * to our address on another net goes to loopback). 450 */ 451 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 452 ia = ifatoia(ro->ro_rt->rt_ifa); 453 if (ia == NULL) { 454 u_short fport = sin->sin_port; 455 456 sin->sin_port = 0; 457 ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin))); 458 if (ia == NULL) 459 ia = ifatoia(ifa_ifwithnet(sintosa(sin))); 460 sin->sin_port = fport; 461 if (ia == NULL) 462 ia = TAILQ_FIRST(&in_ifaddrhead); 463 if (ia == NULL) 464 return (EADDRNOTAVAIL); 465 } 466 /* 467 * If the destination address is multicast and an outgoing 468 * interface has been set as a multicast option, use the 469 * address of that interface as our source address. 470 */ 471 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && 472 inp->inp_moptions != NULL) { 473 struct ip_moptions *imo; 474 struct ifnet *ifp; 475 476 imo = inp->inp_moptions; 477 if (imo->imo_multicast_ifp != NULL) { 478 ifp = imo->imo_multicast_ifp; 479 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 480 if (ia->ia_ifp == ifp) 481 break; 482 if (ia == NULL) 483 return (EADDRNOTAVAIL); 484 } 485 } 486 /* 487 * Don't do pcblookup call here; return interface in plocal_sin 488 * and exit to caller, that will do the lookup. 489 */ 490 *plocal_sin = &ia->ia_addr; 491 492 } 493 return (0); 494 } 495 496 /* 497 * Outer subroutine: 498 * Connect from a socket to a specified address. 499 * Both address and port must be specified in argument sin. 500 * If don't have a local address for this socket yet, 501 * then pick one. 502 */ 503 int 504 in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 505 { 506 struct sockaddr_in *if_sin; 507 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 508 struct sockaddr_in sa; 509 struct ucred *cr = td->td_proc ? td->td_proc->p_ucred : NULL; 510 int error; 511 512 if (cr && cr->cr_prison != NULL && in_nullhost(inp->inp_laddr)) { 513 bzero(&sa, sizeof sa); 514 sa.sin_addr.s_addr = htonl(cr->cr_prison->pr_ip); 515 sa.sin_len = sizeof sa; 516 sa.sin_family = AF_INET; 517 error = in_pcbbind(inp, (struct sockaddr *)&sa, td); 518 if (error) 519 return (error); 520 } 521 522 /* Call inner routine to assign local interface address. */ 523 if ((error = in_pcbladdr(inp, nam, &if_sin)) != 0) 524 return (error); 525 526 if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port, 527 inp->inp_laddr.s_addr ? inp->inp_laddr : if_sin->sin_addr, 528 inp->inp_lport, FALSE, NULL) != NULL) { 529 return (EADDRINUSE); 530 } 531 if (inp->inp_laddr.s_addr == INADDR_ANY) { 532 if (inp->inp_lport == 0) { 533 error = in_pcbbind(inp, (struct sockaddr *)NULL, td); 534 if (error) 535 return (error); 536 } 537 inp->inp_laddr = if_sin->sin_addr; 538 } 539 inp->inp_faddr = sin->sin_addr; 540 inp->inp_fport = sin->sin_port; 541 in_pcbinsconnhash(inp); 542 return (0); 543 } 544 545 void 546 in_pcbdisconnect(inp) 547 struct inpcb *inp; 548 { 549 550 inp->inp_faddr.s_addr = INADDR_ANY; 551 inp->inp_fport = 0; 552 in_pcbremconnhash(inp); 553 if (inp->inp_socket->so_state & SS_NOFDREF) 554 in_pcbdetach(inp); 555 } 556 557 void 558 in_pcbdetach(inp) 559 struct inpcb *inp; 560 { 561 struct socket *so = inp->inp_socket; 562 struct inpcbinfo *ipi = inp->inp_pcbinfo; 563 564 #ifdef IPSEC 565 ipsec4_delete_pcbpolicy(inp); 566 #endif /*IPSEC*/ 567 inp->inp_gencnt = ++ipi->ipi_gencnt; 568 in_pcbremlists(inp); 569 so->so_pcb = 0; 570 sofree(so); 571 if (inp->inp_options) 572 (void)m_free(inp->inp_options); 573 if (inp->inp_route.ro_rt) 574 rtfree(inp->inp_route.ro_rt); 575 ip_freemoptions(inp->inp_moptions); 576 inp->inp_vflag = 0; 577 zfree(ipi->ipi_zone, inp); 578 } 579 580 /* 581 * The calling convention of in_setsockaddr() and in_setpeeraddr() was 582 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 583 * in struct pr_usrreqs, so that protocols can just reference then directly 584 * without the need for a wrapper function. The socket must have a valid 585 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 586 * except through a kernel programming error, so it is acceptable to panic 587 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 588 * because there actually /is/ a programming error somewhere... XXX) 589 */ 590 int 591 in_setsockaddr(so, nam) 592 struct socket *so; 593 struct sockaddr **nam; 594 { 595 int s; 596 struct inpcb *inp; 597 struct sockaddr_in *sin; 598 599 /* 600 * Do the malloc first in case it blocks. 601 */ 602 MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, 603 M_WAITOK | M_ZERO); 604 sin->sin_family = AF_INET; 605 sin->sin_len = sizeof *sin; 606 607 s = splnet(); 608 inp = sotoinpcb(so); 609 if (!inp) { 610 splx(s); 611 free(sin, M_SONAME); 612 return (ECONNRESET); 613 } 614 sin->sin_port = inp->inp_lport; 615 sin->sin_addr = inp->inp_laddr; 616 splx(s); 617 618 *nam = (struct sockaddr *)sin; 619 return (0); 620 } 621 622 int 623 in_setpeeraddr(so, nam) 624 struct socket *so; 625 struct sockaddr **nam; 626 { 627 int s; 628 struct inpcb *inp; 629 struct sockaddr_in *sin; 630 631 /* 632 * Do the malloc first in case it blocks. 633 */ 634 MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, 635 M_WAITOK | M_ZERO); 636 sin->sin_family = AF_INET; 637 sin->sin_len = sizeof *sin; 638 639 s = splnet(); 640 inp = sotoinpcb(so); 641 if (!inp) { 642 splx(s); 643 free(sin, M_SONAME); 644 return (ECONNRESET); 645 } 646 sin->sin_port = inp->inp_fport; 647 sin->sin_addr = inp->inp_faddr; 648 splx(s); 649 650 *nam = (struct sockaddr *)sin; 651 return (0); 652 } 653 654 void 655 in_pcbnotifyall(head, faddr, errno, notify) 656 struct inpcbhead *head; 657 struct in_addr faddr; 658 void (*notify) (struct inpcb *, int); 659 { 660 struct inpcb *inp, *ninp; 661 int s; 662 663 s = splnet(); 664 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 665 ninp = LIST_NEXT(inp, inp_list); 666 #ifdef INET6 667 if (!(inp->inp_vflag & INP_IPV4)) 668 continue; 669 #endif 670 if (inp->inp_faddr.s_addr != faddr.s_addr || 671 inp->inp_socket == NULL) 672 continue; 673 (*notify)(inp, errno); 674 } 675 splx(s); 676 } 677 678 void 679 in_pcbpurgeif0(head, ifp) 680 struct inpcb *head; 681 struct ifnet *ifp; 682 { 683 struct inpcb *inp; 684 struct ip_moptions *imo; 685 int i, gap; 686 687 for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) { 688 imo = inp->inp_moptions; 689 if ((inp->inp_vflag & INP_IPV4) && imo != NULL) { 690 /* 691 * Unselect the outgoing interface if it is being 692 * detached. 693 */ 694 if (imo->imo_multicast_ifp == ifp) 695 imo->imo_multicast_ifp = NULL; 696 697 /* 698 * Drop multicast group membership if we joined 699 * through the interface being detached. 700 */ 701 for (i = 0, gap = 0; i < imo->imo_num_memberships; 702 i++) { 703 if (imo->imo_membership[i]->inm_ifp == ifp) { 704 in_delmulti(imo->imo_membership[i]); 705 gap++; 706 } else if (gap != 0) 707 imo->imo_membership[i - gap] = 708 imo->imo_membership[i]; 709 } 710 imo->imo_num_memberships -= gap; 711 } 712 } 713 } 714 715 /* 716 * Check for alternatives when higher level complains 717 * about service problems. For now, invalidate cached 718 * routing information. If the route was created dynamically 719 * (by a redirect), time to try a default gateway again. 720 */ 721 void 722 in_losing(inp) 723 struct inpcb *inp; 724 { 725 struct rtentry *rt; 726 struct rt_addrinfo info; 727 728 if ((rt = inp->inp_route.ro_rt)) { 729 bzero((caddr_t)&info, sizeof info); 730 info.rti_flags = rt->rt_flags; 731 info.rti_info[RTAX_DST] = rt_key(rt); 732 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 733 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 734 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 735 if (rt->rt_flags & RTF_DYNAMIC) 736 (void) rtrequest1(RTM_DELETE, &info, NULL); 737 inp->inp_route.ro_rt = NULL; 738 rtfree(rt); 739 /* 740 * A new route can be allocated 741 * the next time output is attempted. 742 */ 743 } 744 } 745 746 /* 747 * After a routing change, flush old routing 748 * and allocate a (hopefully) better one. 749 */ 750 void 751 in_rtchange(inp, errno) 752 struct inpcb *inp; 753 int errno; 754 { 755 if (inp->inp_route.ro_rt) { 756 rtfree(inp->inp_route.ro_rt); 757 inp->inp_route.ro_rt = 0; 758 /* 759 * A new route can be allocated the next time 760 * output is attempted. 761 */ 762 } 763 } 764 765 /* 766 * Lookup a PCB based on the local address and port. 767 */ 768 struct inpcb * 769 in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 770 struct inpcbinfo *pcbinfo; 771 struct in_addr laddr; 772 u_int lport_arg; 773 int wild_okay; 774 { 775 struct inpcb *inp; 776 int matchwild = 3, wildcard; 777 u_short lport = lport_arg; 778 779 struct inpcbporthead *porthash; 780 struct inpcbport *phd; 781 struct inpcb *match = NULL; 782 783 /* 784 * Best fit PCB lookup. 785 * 786 * First see if this local port is in use by looking on the 787 * port hash list. 788 */ 789 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 790 pcbinfo->porthashmask)]; 791 LIST_FOREACH(phd, porthash, phd_hash) { 792 if (phd->phd_port == lport) 793 break; 794 } 795 if (phd != NULL) { 796 /* 797 * Port is in use by one or more PCBs. Look for best 798 * fit. 799 */ 800 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 801 wildcard = 0; 802 #ifdef INET6 803 if ((inp->inp_vflag & INP_IPV4) == 0) 804 continue; 805 #endif 806 if (inp->inp_faddr.s_addr != INADDR_ANY) 807 wildcard++; 808 if (inp->inp_laddr.s_addr != INADDR_ANY) { 809 if (laddr.s_addr == INADDR_ANY) 810 wildcard++; 811 else if (inp->inp_laddr.s_addr != laddr.s_addr) 812 continue; 813 } else { 814 if (laddr.s_addr != INADDR_ANY) 815 wildcard++; 816 } 817 if (wildcard && !wild_okay) 818 continue; 819 if (wildcard < matchwild) { 820 match = inp; 821 matchwild = wildcard; 822 if (matchwild == 0) { 823 break; 824 } 825 } 826 } 827 } 828 return (match); 829 } 830 831 /* 832 * Lookup PCB in hash list. 833 */ 834 struct inpcb * 835 in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 836 struct inpcbinfo *pcbinfo; 837 struct in_addr faddr, laddr; 838 u_int fport_arg, lport_arg; 839 boolean_t wildcard; 840 struct ifnet *ifp; 841 { 842 struct inpcbhead *head; 843 struct inpcb *inp; 844 u_short fport = fport_arg, lport = lport_arg; 845 846 /* 847 * First look for an exact match. 848 */ 849 head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport, 850 laddr.s_addr, lport, pcbinfo->hashmask)]; 851 LIST_FOREACH(inp, head, inp_hash) { 852 #ifdef INET6 853 if (!(inp->inp_vflag & INP_IPV4)) 854 continue; 855 #endif 856 if (in_hosteq(inp->inp_faddr, faddr) && 857 in_hosteq(inp->inp_laddr, laddr) && 858 inp->inp_fport == fport && inp->inp_lport == lport) { 859 /* found */ 860 return (inp); 861 } 862 } 863 864 if (wildcard) { 865 struct inpcb *local_wild = NULL; 866 #ifdef INET6 867 struct inpcb *local_wild_mapped = NULL; 868 #endif 869 870 head = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport, 871 pcbinfo->wildcardhashmask)]; 872 LIST_FOREACH(inp, head, inp_hash) { 873 #ifdef INET6 874 if (!(inp->inp_vflag & INP_IPV4)) 875 continue; 876 #endif 877 if (inp->inp_lport == lport) { 878 if (ifp && ifp->if_type == IFT_FAITH && 879 !(inp->inp_flags & INP_FAITH)) 880 continue; 881 if (inp->inp_laddr.s_addr == laddr.s_addr) 882 return (inp); 883 if (inp->inp_laddr.s_addr == INADDR_ANY) { 884 #ifdef INET6 885 if (INP_CHECK_SOCKAF(inp->inp_socket, 886 AF_INET6)) 887 local_wild_mapped = inp; 888 else 889 #endif 890 local_wild = inp; 891 } 892 } 893 } 894 #ifdef INET6 895 if (local_wild == NULL) 896 return (local_wild_mapped); 897 #endif 898 return (local_wild); 899 } 900 901 /* 902 * Not found. 903 */ 904 return (NULL); 905 } 906 907 /* 908 * Insert PCB into connection hash table. 909 */ 910 void 911 in_pcbinsconnhash(struct inpcb *inp) 912 { 913 struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo; 914 struct inpcbhead *bucket; 915 u_int32_t hashkey_faddr, hashkey_laddr; 916 917 #ifdef INET6 918 if (inp->inp_vflag & INP_IPV6) { 919 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */; 920 hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */; 921 } else { 922 #endif 923 hashkey_faddr = inp->inp_faddr.s_addr; 924 hashkey_laddr = inp->inp_laddr.s_addr; 925 #ifdef INET6 926 } 927 #endif 928 929 KASSERT(!(inp->inp_flags & (INP_WILDCARD | INP_CONNECTED)), 930 ("already on hash list")); 931 inp->inp_flags |= INP_CONNECTED; 932 933 /* 934 * Insert into the connection hash table. 935 */ 936 bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr, 937 inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)]; 938 LIST_INSERT_HEAD(bucket, inp, inp_hash); 939 } 940 941 /* 942 * Remove PCB from connection hash table. 943 */ 944 void 945 in_pcbremconnhash(struct inpcb *inp) 946 { 947 KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected")); 948 LIST_REMOVE(inp, inp_hash); 949 inp->inp_flags &= ~INP_CONNECTED; 950 } 951 952 /* 953 * Insert PCB into port hash table. 954 */ 955 int 956 in_pcbinsporthash(struct inpcb *inp) 957 { 958 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 959 struct inpcbporthead *pcbporthash; 960 struct inpcbport *phd; 961 962 /* 963 * Insert into the port hash table. 964 */ 965 pcbporthash = &pcbinfo->porthashbase[ 966 INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)]; 967 968 /* Go through port list and look for a head for this lport. */ 969 LIST_FOREACH(phd, pcbporthash, phd_hash) 970 if (phd->phd_port == inp->inp_lport) 971 break; 972 973 /* If none exists, malloc one and tack it on. */ 974 if (phd == NULL) { 975 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), 976 M_PCB, M_NOWAIT); 977 if (phd == NULL) 978 return (ENOBUFS); /* XXX */ 979 phd->phd_port = inp->inp_lport; 980 LIST_INIT(&phd->phd_pcblist); 981 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash); 982 } 983 984 inp->inp_phd = phd; 985 LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); 986 987 return (0); 988 } 989 990 /* 991 * Insert PCB into wildcard hash table. 992 */ 993 void 994 in_pcbinswildcardhash(struct inpcb *inp) 995 { 996 struct inpcbhead *bucket; 997 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 998 999 bucket = &pcbinfo->wildcardhashbase[ 1000 INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)]; 1001 1002 inp->inp_flags |= INP_WILDCARD; 1003 LIST_INSERT_HEAD(bucket, inp, inp_hash); 1004 } 1005 1006 /* 1007 * Remove PCB from wildcard hash table. 1008 */ 1009 void 1010 in_pcbremwildcardhash(struct inpcb *inp) 1011 { 1012 KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard")); 1013 LIST_REMOVE(inp, inp_hash); 1014 inp->inp_flags &= ~INP_WILDCARD; 1015 } 1016 1017 static void 1018 in_pcbremhash(struct inpcb *inp) 1019 { 1020 if (inp->inp_flags & (INP_WILDCARD | INP_CONNECTED)) { 1021 LIST_REMOVE(inp, inp_hash); 1022 inp->inp_flags &= ~(INP_WILDCARD | INP_CONNECTED); 1023 } 1024 } 1025 1026 /* 1027 * Remove PCB from various lists. 1028 */ 1029 void 1030 in_pcbremlists(inp) 1031 struct inpcb *inp; 1032 { 1033 if (inp->inp_lport) { 1034 struct inpcbport *phd = inp->inp_phd; 1035 1036 LIST_REMOVE(inp, inp_portlist); 1037 if (LIST_FIRST(&phd->phd_pcblist) == NULL) { 1038 LIST_REMOVE(phd, phd_hash); 1039 free(phd, M_PCB); 1040 } 1041 } 1042 in_pcbremhash(inp); 1043 LIST_REMOVE(inp, inp_list); 1044 inp->inp_pcbinfo->ipi_count--; 1045 } 1046 1047 int 1048 prison_xinpcb(struct thread *td, struct inpcb *inp) 1049 { 1050 struct ucred *cr; 1051 1052 if (td->td_proc == NULL) 1053 return (0); 1054 cr = td->td_proc->p_ucred; 1055 if (cr->cr_prison == NULL) 1056 return (0); 1057 if (ntohl(inp->inp_laddr.s_addr) == cr->cr_prison->pr_ip) 1058 return (0); 1059 return (1); 1060 } 1061