1 /* 2 * Copyright (c) 1982, 1986, 1991, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 34 * $FreeBSD$ 35 */ 36 37 #include "opt_ipsec.h" 38 #include "opt_inet6.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/domain.h> 45 #include <sys/protosw.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/proc.h> 49 #include <sys/jail.h> 50 #include <sys/kernel.h> 51 #include <sys/sysctl.h> 52 53 #include <machine/limits.h> 54 55 #include <vm/vm_zone.h> 56 57 #include <net/if.h> 58 #include <net/if_types.h> 59 #include <net/route.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_pcb.h> 63 #include <netinet/in_var.h> 64 #include <netinet/ip_var.h> 65 #ifdef INET6 66 #include <netinet/ip6.h> 67 #include <netinet6/ip6_var.h> 68 #endif /* INET6 */ 69 70 #include "faith.h" 71 72 #ifdef IPSEC 73 #include <netinet6/ipsec.h> 74 #include <netkey/key.h> 75 #endif /* IPSEC */ 76 77 struct in_addr zeroin_addr; 78 79 /* 80 * These configure the range of local port addresses assigned to 81 * "unspecified" outgoing connections/packets/whatever. 82 */ 83 int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */ 84 int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */ 85 int ipport_firstauto = IPPORT_RESERVED; /* 1024 */ 86 int ipport_lastauto = IPPORT_USERRESERVED; /* 5000 */ 87 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 49152 */ 88 int ipport_hilastauto = IPPORT_HILASTAUTO; /* 65535 */ 89 90 #define RANGECHK(var, min, max) \ 91 if ((var) < (min)) { (var) = (min); } \ 92 else if ((var) > (max)) { (var) = (max); } 93 94 static int 95 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS) 96 { 97 int error = sysctl_handle_int(oidp, 98 oidp->oid_arg1, oidp->oid_arg2, req); 99 if (!error) { 100 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1); 101 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1); 102 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX); 103 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX); 104 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX); 105 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX); 106 } 107 return error; 108 } 109 110 #undef RANGECHK 111 112 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports"); 113 114 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW, 115 &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", ""); 116 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW, 117 &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", ""); 118 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW, 119 &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", ""); 120 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW, 121 &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", ""); 122 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW, 123 &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", ""); 124 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW, 125 &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", ""); 126 127 /* 128 * in_pcb.c: manage the Protocol Control Blocks. 129 * 130 * NOTE: It is assumed that most of these functions will be called at 131 * splnet(). XXX - There are, unfortunately, a few exceptions to this 132 * rule that should be fixed. 133 */ 134 135 /* 136 * Allocate a PCB and associate it with the socket. 137 */ 138 int 139 in_pcballoc(so, pcbinfo, td) 140 struct socket *so; 141 struct inpcbinfo *pcbinfo; 142 struct thread *td; 143 { 144 register struct inpcb *inp; 145 #ifdef IPSEC 146 int error; 147 #endif 148 149 inp = zalloc(pcbinfo->ipi_zone); 150 if (inp == NULL) 151 return (ENOBUFS); 152 bzero((caddr_t)inp, sizeof(*inp)); 153 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 154 inp->inp_pcbinfo = pcbinfo; 155 inp->inp_socket = so; 156 #ifdef IPSEC 157 error = ipsec_init_policy(so, &inp->inp_sp); 158 if (error != 0) { 159 zfree(pcbinfo->ipi_zone, inp); 160 return error; 161 } 162 #endif /*IPSEC*/ 163 #if defined(INET6) 164 if (INP_SOCKAF(so) == AF_INET6 && !ip6_mapped_addr_on) 165 inp->inp_flags |= IN6P_IPV6_V6ONLY; 166 #endif 167 LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list); 168 pcbinfo->ipi_count++; 169 so->so_pcb = (caddr_t)inp; 170 #ifdef INET6 171 if (ip6_auto_flowlabel) 172 inp->inp_flags |= IN6P_AUTOFLOWLABEL; 173 #endif 174 return (0); 175 } 176 177 int 178 in_pcbbind(inp, nam, td) 179 register struct inpcb *inp; 180 struct sockaddr *nam; 181 struct thread *td; 182 { 183 struct proc *p = td->td_proc; 184 register struct socket *so = inp->inp_socket; 185 unsigned short *lastport; 186 struct sockaddr_in *sin; 187 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 188 u_short lport = 0; 189 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 190 int error, prison = 0; 191 192 if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */ 193 return (EADDRNOTAVAIL); 194 if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) 195 return (EINVAL); 196 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 197 wild = 1; 198 if (nam) { 199 sin = (struct sockaddr_in *)nam; 200 if (nam->sa_len != sizeof (*sin)) 201 return (EINVAL); 202 #ifdef notdef 203 /* 204 * We should check the family, but old programs 205 * incorrectly fail to initialize it. 206 */ 207 if (sin->sin_family != AF_INET) 208 return (EAFNOSUPPORT); 209 #endif 210 if (sin->sin_addr.s_addr != INADDR_ANY) 211 if (prison_ip(p->p_ucred, 0, &sin->sin_addr.s_addr)) 212 return(EINVAL); 213 lport = sin->sin_port; 214 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 215 /* 216 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 217 * allow complete duplication of binding if 218 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 219 * and a multicast address is bound on both 220 * new and duplicated sockets. 221 */ 222 if (so->so_options & SO_REUSEADDR) 223 reuseport = SO_REUSEADDR|SO_REUSEPORT; 224 } else if (sin->sin_addr.s_addr != INADDR_ANY) { 225 sin->sin_port = 0; /* yech... */ 226 if (ifa_ifwithaddr((struct sockaddr *)sin) == 0) 227 return (EADDRNOTAVAIL); 228 } 229 if (lport) { 230 struct inpcb *t; 231 /* GROSS */ 232 if (ntohs(lport) < IPPORT_RESERVED && p && 233 suser_xxx(0, p, PRISON_ROOT)) 234 return (EACCES); 235 if (p && jailed(p->p_ucred)) 236 prison = 1; 237 if (so->so_cred->cr_uid != 0 && 238 !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 239 t = in_pcblookup_local(inp->inp_pcbinfo, 240 sin->sin_addr, lport, 241 prison ? 0 : INPLOOKUP_WILDCARD); 242 if (t && 243 (ntohl(sin->sin_addr.s_addr) != INADDR_ANY || 244 ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 245 (t->inp_socket->so_options & 246 SO_REUSEPORT) == 0) && 247 (so->so_cred->cr_uid != 248 t->inp_socket->so_cred->cr_uid)) { 249 #if defined(INET6) 250 if (ntohl(sin->sin_addr.s_addr) != 251 INADDR_ANY || 252 ntohl(t->inp_laddr.s_addr) != 253 INADDR_ANY || 254 INP_SOCKAF(so) == 255 INP_SOCKAF(t->inp_socket)) 256 #endif /* defined(INET6) */ 257 return (EADDRINUSE); 258 } 259 } 260 if (prison && 261 prison_ip(p->p_ucred, 0, &sin->sin_addr.s_addr)) 262 return (EADDRNOTAVAIL); 263 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 264 lport, prison ? 0 : wild); 265 if (t && 266 (reuseport & t->inp_socket->so_options) == 0) { 267 #if defined(INET6) 268 if (ntohl(sin->sin_addr.s_addr) != 269 INADDR_ANY || 270 ntohl(t->inp_laddr.s_addr) != 271 INADDR_ANY || 272 INP_SOCKAF(so) == 273 INP_SOCKAF(t->inp_socket)) 274 #endif /* defined(INET6) */ 275 return (EADDRINUSE); 276 } 277 } 278 inp->inp_laddr = sin->sin_addr; 279 } 280 if (lport == 0) { 281 ushort first, last; 282 int count; 283 284 if (inp->inp_laddr.s_addr != INADDR_ANY) 285 if (prison_ip(p->p_ucred, 0, &inp->inp_laddr.s_addr )) { 286 inp->inp_laddr.s_addr = INADDR_ANY; 287 return (EINVAL); 288 } 289 inp->inp_flags |= INP_ANONPORT; 290 291 if (inp->inp_flags & INP_HIGHPORT) { 292 first = ipport_hifirstauto; /* sysctl */ 293 last = ipport_hilastauto; 294 lastport = &pcbinfo->lasthi; 295 } else if (inp->inp_flags & INP_LOWPORT) { 296 if (p && (error = suser_xxx(0, p, PRISON_ROOT))) { 297 inp->inp_laddr.s_addr = INADDR_ANY; 298 return error; 299 } 300 first = ipport_lowfirstauto; /* 1023 */ 301 last = ipport_lowlastauto; /* 600 */ 302 lastport = &pcbinfo->lastlow; 303 } else { 304 first = ipport_firstauto; /* sysctl */ 305 last = ipport_lastauto; 306 lastport = &pcbinfo->lastport; 307 } 308 /* 309 * Simple check to ensure all ports are not used up causing 310 * a deadlock here. 311 * 312 * We split the two cases (up and down) so that the direction 313 * is not being tested on each round of the loop. 314 */ 315 if (first > last) { 316 /* 317 * counting down 318 */ 319 count = first - last; 320 321 do { 322 if (count-- < 0) { /* completely used? */ 323 inp->inp_laddr.s_addr = INADDR_ANY; 324 return (EADDRNOTAVAIL); 325 } 326 --*lastport; 327 if (*lastport > first || *lastport < last) 328 *lastport = first; 329 lport = htons(*lastport); 330 } while (in_pcblookup_local(pcbinfo, 331 inp->inp_laddr, lport, wild)); 332 } else { 333 /* 334 * counting up 335 */ 336 count = last - first; 337 338 do { 339 if (count-- < 0) { /* completely used? */ 340 /* 341 * Undo any address bind that may have 342 * occurred above. 343 */ 344 inp->inp_laddr.s_addr = INADDR_ANY; 345 return (EADDRNOTAVAIL); 346 } 347 ++*lastport; 348 if (*lastport < first || *lastport > last) 349 *lastport = first; 350 lport = htons(*lastport); 351 } while (in_pcblookup_local(pcbinfo, 352 inp->inp_laddr, lport, wild)); 353 } 354 } 355 inp->inp_lport = lport; 356 if (prison_ip(p->p_ucred, 0, &inp->inp_laddr.s_addr)) { 357 inp->inp_laddr.s_addr = INADDR_ANY; 358 inp->inp_lport = 0; 359 return(EINVAL); 360 } 361 if (in_pcbinshash(inp) != 0) { 362 inp->inp_laddr.s_addr = INADDR_ANY; 363 inp->inp_lport = 0; 364 return (EAGAIN); 365 } 366 return (0); 367 } 368 369 /* 370 * Transform old in_pcbconnect() into an inner subroutine for new 371 * in_pcbconnect(): Do some validity-checking on the remote 372 * address (in mbuf 'nam') and then determine local host address 373 * (i.e., which interface) to use to access that remote host. 374 * 375 * This preserves definition of in_pcbconnect(), while supporting a 376 * slightly different version for T/TCP. (This is more than 377 * a bit of a kludge, but cleaning up the internal interfaces would 378 * have forced minor changes in every protocol). 379 */ 380 381 int 382 in_pcbladdr(inp, nam, plocal_sin) 383 register struct inpcb *inp; 384 struct sockaddr *nam; 385 struct sockaddr_in **plocal_sin; 386 { 387 struct in_ifaddr *ia; 388 register struct sockaddr_in *sin = (struct sockaddr_in *)nam; 389 390 if (nam->sa_len != sizeof (*sin)) 391 return (EINVAL); 392 if (sin->sin_family != AF_INET) 393 return (EAFNOSUPPORT); 394 if (sin->sin_port == 0) 395 return (EADDRNOTAVAIL); 396 if (!TAILQ_EMPTY(&in_ifaddrhead)) { 397 /* 398 * If the destination address is INADDR_ANY, 399 * use the primary local address. 400 * If the supplied address is INADDR_BROADCAST, 401 * and the primary interface supports broadcast, 402 * choose the broadcast address for that interface. 403 */ 404 #define satosin(sa) ((struct sockaddr_in *)(sa)) 405 #define sintosa(sin) ((struct sockaddr *)(sin)) 406 #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) 407 if (sin->sin_addr.s_addr == INADDR_ANY) 408 sin->sin_addr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr; 409 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST && 410 (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags & IFF_BROADCAST)) 411 sin->sin_addr = satosin(&TAILQ_FIRST(&in_ifaddrhead)->ia_broadaddr)->sin_addr; 412 } 413 if (inp->inp_laddr.s_addr == INADDR_ANY) { 414 register struct route *ro; 415 416 ia = (struct in_ifaddr *)0; 417 /* 418 * If route is known or can be allocated now, 419 * our src addr is taken from the i/f, else punt. 420 */ 421 ro = &inp->inp_route; 422 if (ro->ro_rt && 423 (satosin(&ro->ro_dst)->sin_addr.s_addr != 424 sin->sin_addr.s_addr || 425 inp->inp_socket->so_options & SO_DONTROUTE)) { 426 RTFREE(ro->ro_rt); 427 ro->ro_rt = (struct rtentry *)0; 428 } 429 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 430 (ro->ro_rt == (struct rtentry *)0 || 431 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 432 /* No route yet, so try to acquire one */ 433 ro->ro_dst.sa_family = AF_INET; 434 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 435 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = 436 sin->sin_addr; 437 rtalloc(ro); 438 } 439 /* 440 * If we found a route, use the address 441 * corresponding to the outgoing interface 442 * unless it is the loopback (in case a route 443 * to our address on another net goes to loopback). 444 */ 445 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 446 ia = ifatoia(ro->ro_rt->rt_ifa); 447 if (ia == 0) { 448 u_short fport = sin->sin_port; 449 450 sin->sin_port = 0; 451 ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin))); 452 if (ia == 0) 453 ia = ifatoia(ifa_ifwithnet(sintosa(sin))); 454 sin->sin_port = fport; 455 if (ia == 0) 456 ia = TAILQ_FIRST(&in_ifaddrhead); 457 if (ia == 0) 458 return (EADDRNOTAVAIL); 459 } 460 /* 461 * If the destination address is multicast and an outgoing 462 * interface has been set as a multicast option, use the 463 * address of that interface as our source address. 464 */ 465 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && 466 inp->inp_moptions != NULL) { 467 struct ip_moptions *imo; 468 struct ifnet *ifp; 469 470 imo = inp->inp_moptions; 471 if (imo->imo_multicast_ifp != NULL) { 472 ifp = imo->imo_multicast_ifp; 473 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 474 if (ia->ia_ifp == ifp) 475 break; 476 if (ia == 0) 477 return (EADDRNOTAVAIL); 478 } 479 } 480 /* 481 * Don't do pcblookup call here; return interface in plocal_sin 482 * and exit to caller, that will do the lookup. 483 */ 484 *plocal_sin = &ia->ia_addr; 485 486 } 487 return(0); 488 } 489 490 /* 491 * Outer subroutine: 492 * Connect from a socket to a specified address. 493 * Both address and port must be specified in argument sin. 494 * If don't have a local address for this socket yet, 495 * then pick one. 496 */ 497 int 498 in_pcbconnect(inp, nam, td) 499 register struct inpcb *inp; 500 struct sockaddr *nam; 501 struct thread *td; 502 { 503 struct sockaddr_in *ifaddr; 504 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 505 struct sockaddr_in sa; 506 struct ucred *cred; 507 int error; 508 509 cred = inp->inp_socket->so_cred; 510 if (inp->inp_laddr.s_addr == INADDR_ANY && jailed(cred)) { 511 bzero(&sa, sizeof (sa)); 512 sa.sin_addr.s_addr = htonl(cred->cr_prison->pr_ip); 513 sa.sin_len=sizeof (sa); 514 sa.sin_family = AF_INET; 515 error = in_pcbbind(inp, (struct sockaddr *)&sa, td); 516 if (error) 517 return (error); 518 } 519 /* 520 * Call inner routine, to assign local interface address. 521 */ 522 if ((error = in_pcbladdr(inp, nam, &ifaddr)) != 0) 523 return(error); 524 525 if (in_pcblookup_hash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port, 526 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 527 inp->inp_lport, 0, NULL) != NULL) { 528 return (EADDRINUSE); 529 } 530 if (inp->inp_laddr.s_addr == INADDR_ANY) { 531 if (inp->inp_lport == 0) { 532 error = in_pcbbind(inp, (struct sockaddr *)0, td); 533 if (error) 534 return (error); 535 } 536 inp->inp_laddr = ifaddr->sin_addr; 537 } 538 inp->inp_faddr = sin->sin_addr; 539 inp->inp_fport = sin->sin_port; 540 in_pcbrehash(inp); 541 return (0); 542 } 543 544 void 545 in_pcbdisconnect(inp) 546 struct inpcb *inp; 547 { 548 549 inp->inp_faddr.s_addr = INADDR_ANY; 550 inp->inp_fport = 0; 551 in_pcbrehash(inp); 552 if (inp->inp_socket->so_state & SS_NOFDREF) 553 in_pcbdetach(inp); 554 } 555 556 void 557 in_pcbdetach(inp) 558 struct inpcb *inp; 559 { 560 struct socket *so = inp->inp_socket; 561 struct inpcbinfo *ipi = inp->inp_pcbinfo; 562 struct rtentry *rt = inp->inp_route.ro_rt; 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 (rt) { 574 /* 575 * route deletion requires reference count to be <= zero 576 */ 577 if ((rt->rt_flags & RTF_DELCLONE) && 578 (rt->rt_flags & RTF_WASCLONED) && 579 (rt->rt_refcnt <= 1)) { 580 rt->rt_refcnt--; 581 rt->rt_flags &= ~RTF_UP; 582 rtrequest(RTM_DELETE, rt_key(rt), 583 rt->rt_gateway, rt_mask(rt), 584 rt->rt_flags, (struct rtentry **)0); 585 } 586 else 587 rtfree(rt); 588 } 589 ip_freemoptions(inp->inp_moptions); 590 inp->inp_vflag = 0; 591 zfree(ipi->ipi_zone, inp); 592 } 593 594 /* 595 * The calling convention of in_setsockaddr() and in_setpeeraddr() was 596 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 597 * in struct pr_usrreqs, so that protocols can just reference then directly 598 * without the need for a wrapper function. The socket must have a valid 599 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 600 * except through a kernel programming error, so it is acceptable to panic 601 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 602 * because there actually /is/ a programming error somewhere... XXX) 603 */ 604 int 605 in_setsockaddr(so, nam) 606 struct socket *so; 607 struct sockaddr **nam; 608 { 609 int s; 610 register struct inpcb *inp; 611 register struct sockaddr_in *sin; 612 613 /* 614 * Do the malloc first in case it blocks. 615 */ 616 MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, 617 M_WAITOK | M_ZERO); 618 sin->sin_family = AF_INET; 619 sin->sin_len = sizeof(*sin); 620 621 s = splnet(); 622 inp = sotoinpcb(so); 623 if (!inp) { 624 splx(s); 625 free(sin, M_SONAME); 626 return ECONNRESET; 627 } 628 sin->sin_port = inp->inp_lport; 629 sin->sin_addr = inp->inp_laddr; 630 splx(s); 631 632 *nam = (struct sockaddr *)sin; 633 return 0; 634 } 635 636 int 637 in_setpeeraddr(so, nam) 638 struct socket *so; 639 struct sockaddr **nam; 640 { 641 int s; 642 struct inpcb *inp; 643 register struct sockaddr_in *sin; 644 645 /* 646 * Do the malloc first in case it blocks. 647 */ 648 MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, 649 M_WAITOK | M_ZERO); 650 sin->sin_family = AF_INET; 651 sin->sin_len = sizeof(*sin); 652 653 s = splnet(); 654 inp = sotoinpcb(so); 655 if (!inp) { 656 splx(s); 657 free(sin, M_SONAME); 658 return ECONNRESET; 659 } 660 sin->sin_port = inp->inp_fport; 661 sin->sin_addr = inp->inp_faddr; 662 splx(s); 663 664 *nam = (struct sockaddr *)sin; 665 return 0; 666 } 667 668 void 669 in_pcbnotifyall(head, faddr, errno, notify) 670 struct inpcbhead *head; 671 struct in_addr faddr; 672 int errno; 673 void (*notify) __P((struct inpcb *, int)); 674 { 675 struct inpcb *inp, *ninp; 676 int s; 677 678 s = splnet(); 679 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 680 ninp = LIST_NEXT(inp, inp_list); 681 #ifdef INET6 682 if ((inp->inp_vflag & INP_IPV4) == 0) 683 continue; 684 #endif 685 if (inp->inp_faddr.s_addr != faddr.s_addr || 686 inp->inp_socket == NULL) 687 continue; 688 (*notify)(inp, errno); 689 } 690 splx(s); 691 } 692 693 void 694 in_pcbpurgeif0(head, ifp) 695 struct inpcb *head; 696 struct ifnet *ifp; 697 { 698 struct inpcb *inp; 699 struct ip_moptions *imo; 700 int i, gap; 701 702 for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) { 703 imo = inp->inp_moptions; 704 if ((inp->inp_vflag & INP_IPV4) && 705 imo != NULL) { 706 /* 707 * Unselect the outgoing interface if it is being 708 * detached. 709 */ 710 if (imo->imo_multicast_ifp == ifp) 711 imo->imo_multicast_ifp = NULL; 712 713 /* 714 * Drop multicast group membership if we joined 715 * through the interface being detached. 716 */ 717 for (i = 0, gap = 0; i < imo->imo_num_memberships; 718 i++) { 719 if (imo->imo_membership[i]->inm_ifp == ifp) { 720 in_delmulti(imo->imo_membership[i]); 721 gap++; 722 } else if (gap != 0) 723 imo->imo_membership[i - gap] = 724 imo->imo_membership[i]; 725 } 726 imo->imo_num_memberships -= gap; 727 } 728 } 729 } 730 731 /* 732 * Check for alternatives when higher level complains 733 * about service problems. For now, invalidate cached 734 * routing information. If the route was created dynamically 735 * (by a redirect), time to try a default gateway again. 736 */ 737 void 738 in_losing(inp) 739 struct inpcb *inp; 740 { 741 register struct rtentry *rt; 742 struct rt_addrinfo info; 743 744 if ((rt = inp->inp_route.ro_rt)) { 745 bzero((caddr_t)&info, sizeof(info)); 746 info.rti_info[RTAX_DST] = 747 (struct sockaddr *)&inp->inp_route.ro_dst; 748 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 749 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 750 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 751 if (rt->rt_flags & RTF_DYNAMIC) 752 (void) rtrequest(RTM_DELETE, rt_key(rt), 753 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 754 (struct rtentry **)0); 755 inp->inp_route.ro_rt = 0; 756 rtfree(rt); 757 /* 758 * A new route can be allocated 759 * the next time output is attempted. 760 */ 761 } 762 } 763 764 /* 765 * After a routing change, flush old routing 766 * and allocate a (hopefully) better one. 767 */ 768 void 769 in_rtchange(inp, errno) 770 register struct inpcb *inp; 771 int errno; 772 { 773 if (inp->inp_route.ro_rt) { 774 rtfree(inp->inp_route.ro_rt); 775 inp->inp_route.ro_rt = 0; 776 /* 777 * A new route can be allocated the next time 778 * output is attempted. 779 */ 780 } 781 } 782 783 /* 784 * Lookup a PCB based on the local address and port. 785 */ 786 struct inpcb * 787 in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 788 struct inpcbinfo *pcbinfo; 789 struct in_addr laddr; 790 u_int lport_arg; 791 int wild_okay; 792 { 793 register struct inpcb *inp; 794 int matchwild = 3, wildcard; 795 u_short lport = lport_arg; 796 797 if (!wild_okay) { 798 struct inpcbhead *head; 799 /* 800 * Look for an unconnected (wildcard foreign addr) PCB that 801 * matches the local address and port we're looking for. 802 */ 803 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)]; 804 LIST_FOREACH(inp, head, inp_hash) { 805 #ifdef INET6 806 if ((inp->inp_vflag & INP_IPV4) == 0) 807 continue; 808 #endif 809 if (inp->inp_faddr.s_addr == INADDR_ANY && 810 inp->inp_laddr.s_addr == laddr.s_addr && 811 inp->inp_lport == lport) { 812 /* 813 * Found. 814 */ 815 return (inp); 816 } 817 } 818 /* 819 * Not found. 820 */ 821 return (NULL); 822 } else { 823 struct inpcbporthead *porthash; 824 struct inpcbport *phd; 825 struct inpcb *match = NULL; 826 /* 827 * Best fit PCB lookup. 828 * 829 * First see if this local port is in use by looking on the 830 * port hash list. 831 */ 832 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 833 pcbinfo->porthashmask)]; 834 LIST_FOREACH(phd, porthash, phd_hash) { 835 if (phd->phd_port == lport) 836 break; 837 } 838 if (phd != NULL) { 839 /* 840 * Port is in use by one or more PCBs. Look for best 841 * fit. 842 */ 843 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 844 wildcard = 0; 845 #ifdef INET6 846 if ((inp->inp_vflag & INP_IPV4) == 0) 847 continue; 848 #endif 849 if (inp->inp_faddr.s_addr != INADDR_ANY) 850 wildcard++; 851 if (inp->inp_laddr.s_addr != INADDR_ANY) { 852 if (laddr.s_addr == INADDR_ANY) 853 wildcard++; 854 else if (inp->inp_laddr.s_addr != laddr.s_addr) 855 continue; 856 } else { 857 if (laddr.s_addr != INADDR_ANY) 858 wildcard++; 859 } 860 if (wildcard < matchwild) { 861 match = inp; 862 matchwild = wildcard; 863 if (matchwild == 0) { 864 break; 865 } 866 } 867 } 868 } 869 return (match); 870 } 871 } 872 873 /* 874 * Lookup PCB in hash list. 875 */ 876 struct inpcb * 877 in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, 878 ifp) 879 struct inpcbinfo *pcbinfo; 880 struct in_addr faddr, laddr; 881 u_int fport_arg, lport_arg; 882 int wildcard; 883 struct ifnet *ifp; 884 { 885 struct inpcbhead *head; 886 register struct inpcb *inp; 887 u_short fport = fport_arg, lport = lport_arg; 888 889 /* 890 * First look for an exact match. 891 */ 892 head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)]; 893 LIST_FOREACH(inp, head, inp_hash) { 894 #ifdef INET6 895 if ((inp->inp_vflag & INP_IPV4) == 0) 896 continue; 897 #endif 898 if (inp->inp_faddr.s_addr == faddr.s_addr && 899 inp->inp_laddr.s_addr == laddr.s_addr && 900 inp->inp_fport == fport && 901 inp->inp_lport == lport) { 902 /* 903 * Found. 904 */ 905 return (inp); 906 } 907 } 908 if (wildcard) { 909 struct inpcb *local_wild = NULL; 910 #if defined(INET6) 911 struct inpcb *local_wild_mapped = NULL; 912 #endif /* defined(INET6) */ 913 914 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)]; 915 LIST_FOREACH(inp, head, inp_hash) { 916 #ifdef INET6 917 if ((inp->inp_vflag & INP_IPV4) == 0) 918 continue; 919 #endif 920 if (inp->inp_faddr.s_addr == INADDR_ANY && 921 inp->inp_lport == lport) { 922 #if defined(NFAITH) && NFAITH > 0 923 if (ifp && ifp->if_type == IFT_FAITH && 924 (inp->inp_flags & INP_FAITH) == 0) 925 continue; 926 #endif 927 if (inp->inp_laddr.s_addr == laddr.s_addr) 928 return (inp); 929 else if (inp->inp_laddr.s_addr == INADDR_ANY) { 930 #if defined(INET6) 931 if (INP_CHECK_SOCKAF(inp->inp_socket, 932 AF_INET6)) 933 local_wild_mapped = inp; 934 else 935 #endif /* defined(INET6) */ 936 local_wild = inp; 937 } 938 } 939 } 940 #if defined(INET6) 941 if (local_wild == NULL) 942 return (local_wild_mapped); 943 #endif /* defined(INET6) */ 944 return (local_wild); 945 } 946 947 /* 948 * Not found. 949 */ 950 return (NULL); 951 } 952 953 /* 954 * Insert PCB onto various hash lists. 955 */ 956 int 957 in_pcbinshash(inp) 958 struct inpcb *inp; 959 { 960 struct inpcbhead *pcbhash; 961 struct inpcbporthead *pcbporthash; 962 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 963 struct inpcbport *phd; 964 u_int32_t hashkey_faddr; 965 966 #ifdef INET6 967 if (inp->inp_vflag & INP_IPV6) 968 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */; 969 else 970 #endif /* INET6 */ 971 hashkey_faddr = inp->inp_faddr.s_addr; 972 973 pcbhash = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr, 974 inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)]; 975 976 pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport, 977 pcbinfo->porthashmask)]; 978 979 /* 980 * Go through port list and look for a head for this lport. 981 */ 982 LIST_FOREACH(phd, pcbporthash, phd_hash) { 983 if (phd->phd_port == inp->inp_lport) 984 break; 985 } 986 /* 987 * If none exists, malloc one and tack it on. 988 */ 989 if (phd == NULL) { 990 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT); 991 if (phd == NULL) { 992 return (ENOBUFS); /* XXX */ 993 } 994 phd->phd_port = inp->inp_lport; 995 LIST_INIT(&phd->phd_pcblist); 996 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash); 997 } 998 inp->inp_phd = phd; 999 LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); 1000 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 1001 return (0); 1002 } 1003 1004 /* 1005 * Move PCB to the proper hash bucket when { faddr, fport } have been 1006 * changed. NOTE: This does not handle the case of the lport changing (the 1007 * hashed port list would have to be updated as well), so the lport must 1008 * not change after in_pcbinshash() has been called. 1009 */ 1010 void 1011 in_pcbrehash(inp) 1012 struct inpcb *inp; 1013 { 1014 struct inpcbhead *head; 1015 u_int32_t hashkey_faddr; 1016 1017 #ifdef INET6 1018 if (inp->inp_vflag & INP_IPV6) 1019 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */; 1020 else 1021 #endif /* INET6 */ 1022 hashkey_faddr = inp->inp_faddr.s_addr; 1023 1024 head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr, 1025 inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)]; 1026 1027 LIST_REMOVE(inp, inp_hash); 1028 LIST_INSERT_HEAD(head, inp, inp_hash); 1029 } 1030 1031 /* 1032 * Remove PCB from various lists. 1033 */ 1034 void 1035 in_pcbremlists(inp) 1036 struct inpcb *inp; 1037 { 1038 inp->inp_gencnt = ++inp->inp_pcbinfo->ipi_gencnt; 1039 if (inp->inp_lport) { 1040 struct inpcbport *phd = inp->inp_phd; 1041 1042 LIST_REMOVE(inp, inp_hash); 1043 LIST_REMOVE(inp, inp_portlist); 1044 if (LIST_FIRST(&phd->phd_pcblist) == NULL) { 1045 LIST_REMOVE(phd, phd_hash); 1046 free(phd, M_PCB); 1047 } 1048 } 1049 LIST_REMOVE(inp, inp_list); 1050 inp->inp_pcbinfo->ipi_count--; 1051 } 1052 1053 int 1054 prison_xinpcb(struct proc *p, struct inpcb *inp) 1055 { 1056 if (!jailed(p->p_ucred)) 1057 return (0); 1058 if (ntohl(inp->inp_laddr.s_addr) == p->p_ucred->cr_prison->pr_ip) 1059 return (0); 1060 return (1); 1061 } 1062