Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_pcb.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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 <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/protosw.h> 42 #include <sys/socket.h> 43 #include <sys/socketvar.h> 44 #include <sys/proc.h> 45 #include <sys/kernel.h> 46 #include <sys/sysctl.h> 47 48 #include <machine/limits.h> 49 50 #include <vm/vm_zone.h> 51 52 #include <net/if.h> 53 #include <net/route.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_pcb.h> 57 #include <netinet/in_var.h> 58 #include <netinet/ip_var.h> 59 60 struct in_addr zeroin_addr; 61 62 static void in_pcbremlists __P((struct inpcb *)); 63 64 /* 65 * These configure the range of local port addresses assigned to 66 * "unspecified" outgoing connections/packets/whatever. 67 */ 68 static int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */ 69 static int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */ 70 static int ipport_firstauto = IPPORT_RESERVED; /* 1024 */ 71 static int ipport_lastauto = IPPORT_USERRESERVED; /* 5000 */ 72 static int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 49152 */ 73 static int ipport_hilastauto = IPPORT_HILASTAUTO; /* 65535 */ 74 75 #define RANGECHK(var, min, max) \ 76 if ((var) < (min)) { (var) = (min); } \ 77 else if ((var) > (max)) { (var) = (max); } 78 79 static int 80 sysctl_net_ipport_check SYSCTL_HANDLER_ARGS 81 { 82 int error = sysctl_handle_int(oidp, 83 oidp->oid_arg1, oidp->oid_arg2, req); 84 if (!error) { 85 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1); 86 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1); 87 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX); 88 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX); 89 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX); 90 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX); 91 } 92 return error; 93 } 94 95 #undef RANGECHK 96 97 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports"); 98 99 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW, 100 &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", ""); 101 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW, 102 &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", ""); 103 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW, 104 &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", ""); 105 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW, 106 &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", ""); 107 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW, 108 &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", ""); 109 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW, 110 &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", ""); 111 112 /* 113 * in_pcb.c: manage the Protocol Control Blocks. 114 * 115 * NOTE: It is assumed that most of these functions will be called at 116 * splnet(). XXX - There are, unfortunately, a few exceptions to this 117 * rule that should be fixed. 118 */ 119 120 /* 121 * Allocate a PCB and associate it with the socket. 122 */ 123 int 124 in_pcballoc(so, pcbinfo, p) 125 struct socket *so; 126 struct inpcbinfo *pcbinfo; 127 struct proc *p; 128 { 129 register struct inpcb *inp; 130 131 inp = zalloci(pcbinfo->ipi_zone); 132 if (inp == NULL) 133 return (ENOBUFS); 134 bzero((caddr_t)inp, sizeof(*inp)); 135 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 136 inp->inp_pcbinfo = pcbinfo; 137 inp->inp_socket = so; 138 LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list); 139 pcbinfo->ipi_count++; 140 so->so_pcb = (caddr_t)inp; 141 return (0); 142 } 143 144 int 145 in_pcbbind(inp, nam, p) 146 register struct inpcb *inp; 147 struct sockaddr *nam; 148 struct proc *p; 149 { 150 register struct socket *so = inp->inp_socket; 151 unsigned short *lastport; 152 struct sockaddr_in *sin; 153 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 154 u_short lport = 0; 155 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 156 int error; 157 158 if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */ 159 return (EADDRNOTAVAIL); 160 if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) 161 return (EINVAL); 162 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 163 wild = 1; 164 if (nam) { 165 sin = (struct sockaddr_in *)nam; 166 if (nam->sa_len != sizeof (*sin)) 167 return (EINVAL); 168 #ifdef notdef 169 /* 170 * We should check the family, but old programs 171 * incorrectly fail to initialize it. 172 */ 173 if (sin->sin_family != AF_INET) 174 return (EAFNOSUPPORT); 175 #endif 176 lport = sin->sin_port; 177 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 178 /* 179 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 180 * allow complete duplication of binding if 181 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 182 * and a multicast address is bound on both 183 * new and duplicated sockets. 184 */ 185 if (so->so_options & SO_REUSEADDR) 186 reuseport = SO_REUSEADDR|SO_REUSEPORT; 187 } else if (sin->sin_addr.s_addr != INADDR_ANY) { 188 sin->sin_port = 0; /* yech... */ 189 if (ifa_ifwithaddr((struct sockaddr *)sin) == 0) 190 return (EADDRNOTAVAIL); 191 } 192 if (lport) { 193 struct inpcb *t; 194 195 /* GROSS */ 196 if (ntohs(lport) < IPPORT_RESERVED && p && 197 suser(p->p_ucred, &p->p_acflag)) 198 return (EACCES); 199 if (so->so_cred && so->so_cred->p_ruid != 0 && 200 !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 201 t = in_pcblookup_local(inp->inp_pcbinfo, 202 sin->sin_addr, lport, INPLOOKUP_WILDCARD); 203 if (t && 204 (ntohl(sin->sin_addr.s_addr) != INADDR_ANY || 205 ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 206 (t->inp_socket->so_options & 207 SO_REUSEPORT) == 0) && 208 (t->inp_socket->so_cred) && 209 (so->so_cred->p_ruid != 210 t->inp_socket->so_cred->p_ruid)) 211 return (EADDRINUSE); 212 } 213 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 214 lport, wild); 215 if (t && (reuseport & t->inp_socket->so_options) == 0) 216 return (EADDRINUSE); 217 } 218 inp->inp_laddr = sin->sin_addr; 219 } 220 if (lport == 0) { 221 ushort first, last; 222 int count; 223 224 inp->inp_flags |= INP_ANONPORT; 225 226 if (inp->inp_flags & INP_HIGHPORT) { 227 first = ipport_hifirstauto; /* sysctl */ 228 last = ipport_hilastauto; 229 lastport = &pcbinfo->lasthi; 230 } else if (inp->inp_flags & INP_LOWPORT) { 231 if (p && (error = suser(p->p_ucred, &p->p_acflag))) 232 return error; 233 first = ipport_lowfirstauto; /* 1023 */ 234 last = ipport_lowlastauto; /* 600 */ 235 lastport = &pcbinfo->lastlow; 236 } else { 237 first = ipport_firstauto; /* sysctl */ 238 last = ipport_lastauto; 239 lastport = &pcbinfo->lastport; 240 } 241 /* 242 * Simple check to ensure all ports are not used up causing 243 * a deadlock here. 244 * 245 * We split the two cases (up and down) so that the direction 246 * is not being tested on each round of the loop. 247 */ 248 if (first > last) { 249 /* 250 * counting down 251 */ 252 count = first - last; 253 254 do { 255 if (count-- < 0) { /* completely used? */ 256 /* 257 * Undo any address bind that may have 258 * occurred above. 259 */ 260 inp->inp_laddr.s_addr = INADDR_ANY; 261 return (EAGAIN); 262 } 263 --*lastport; 264 if (*lastport > first || *lastport < last) 265 *lastport = first; 266 lport = htons(*lastport); 267 } while (in_pcblookup_local(pcbinfo, 268 inp->inp_laddr, lport, wild)); 269 } else { 270 /* 271 * counting up 272 */ 273 count = last - first; 274 275 do { 276 if (count-- < 0) { /* completely used? */ 277 /* 278 * Undo any address bind that may have 279 * occurred above. 280 */ 281 inp->inp_laddr.s_addr = INADDR_ANY; 282 return (EAGAIN); 283 } 284 ++*lastport; 285 if (*lastport < first || *lastport > last) 286 *lastport = first; 287 lport = htons(*lastport); 288 } while (in_pcblookup_local(pcbinfo, 289 inp->inp_laddr, lport, wild)); 290 } 291 } 292 inp->inp_lport = lport; 293 if (in_pcbinshash(inp) != 0) { 294 inp->inp_laddr.s_addr = INADDR_ANY; 295 inp->inp_lport = 0; 296 return (EAGAIN); 297 } 298 return (0); 299 } 300 301 /* 302 * Transform old in_pcbconnect() into an inner subroutine for new 303 * in_pcbconnect(): Do some validity-checking on the remote 304 * address (in mbuf 'nam') and then determine local host address 305 * (i.e., which interface) to use to access that remote host. 306 * 307 * This preserves definition of in_pcbconnect(), while supporting a 308 * slightly different version for T/TCP. (This is more than 309 * a bit of a kludge, but cleaning up the internal interfaces would 310 * have forced minor changes in every protocol). 311 */ 312 313 int 314 in_pcbladdr(inp, nam, plocal_sin) 315 register struct inpcb *inp; 316 struct sockaddr *nam; 317 struct sockaddr_in **plocal_sin; 318 { 319 struct in_ifaddr *ia; 320 register struct sockaddr_in *sin = (struct sockaddr_in *)nam; 321 322 if (nam->sa_len != sizeof (*sin)) 323 return (EINVAL); 324 if (sin->sin_family != AF_INET) 325 return (EAFNOSUPPORT); 326 if (sin->sin_port == 0) 327 return (EADDRNOTAVAIL); 328 if (!TAILQ_EMPTY(&in_ifaddrhead)) { 329 /* 330 * If the destination address is INADDR_ANY, 331 * use the primary local address. 332 * If the supplied address is INADDR_BROADCAST, 333 * and the primary interface supports broadcast, 334 * choose the broadcast address for that interface. 335 */ 336 #define satosin(sa) ((struct sockaddr_in *)(sa)) 337 #define sintosa(sin) ((struct sockaddr *)(sin)) 338 #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) 339 if (sin->sin_addr.s_addr == INADDR_ANY) 340 sin->sin_addr = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr; 341 else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST && 342 (in_ifaddrhead.tqh_first->ia_ifp->if_flags & IFF_BROADCAST)) 343 sin->sin_addr = satosin(&in_ifaddrhead.tqh_first->ia_broadaddr)->sin_addr; 344 } 345 if (inp->inp_laddr.s_addr == INADDR_ANY) { 346 register struct route *ro; 347 348 ia = (struct in_ifaddr *)0; 349 /* 350 * If route is known or can be allocated now, 351 * our src addr is taken from the i/f, else punt. 352 */ 353 ro = &inp->inp_route; 354 if (ro->ro_rt && 355 (satosin(&ro->ro_dst)->sin_addr.s_addr != 356 sin->sin_addr.s_addr || 357 inp->inp_socket->so_options & SO_DONTROUTE)) { 358 RTFREE(ro->ro_rt); 359 ro->ro_rt = (struct rtentry *)0; 360 } 361 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 362 (ro->ro_rt == (struct rtentry *)0 || 363 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 364 /* No route yet, so try to acquire one */ 365 ro->ro_dst.sa_family = AF_INET; 366 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 367 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = 368 sin->sin_addr; 369 rtalloc(ro); 370 } 371 /* 372 * If we found a route, use the address 373 * corresponding to the outgoing interface 374 * unless it is the loopback (in case a route 375 * to our address on another net goes to loopback). 376 */ 377 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 378 ia = ifatoia(ro->ro_rt->rt_ifa); 379 if (ia == 0) { 380 u_short fport = sin->sin_port; 381 382 sin->sin_port = 0; 383 ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin))); 384 if (ia == 0) 385 ia = ifatoia(ifa_ifwithnet(sintosa(sin))); 386 sin->sin_port = fport; 387 if (ia == 0) 388 ia = in_ifaddrhead.tqh_first; 389 if (ia == 0) 390 return (EADDRNOTAVAIL); 391 } 392 /* 393 * If the destination address is multicast and an outgoing 394 * interface has been set as a multicast option, use the 395 * address of that interface as our source address. 396 */ 397 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && 398 inp->inp_moptions != NULL) { 399 struct ip_moptions *imo; 400 struct ifnet *ifp; 401 402 imo = inp->inp_moptions; 403 if (imo->imo_multicast_ifp != NULL) { 404 ifp = imo->imo_multicast_ifp; 405 for (ia = in_ifaddrhead.tqh_first; ia; 406 ia = ia->ia_link.tqe_next) 407 if (ia->ia_ifp == ifp) 408 break; 409 if (ia == 0) 410 return (EADDRNOTAVAIL); 411 } 412 } 413 /* 414 * Don't do pcblookup call here; return interface in plocal_sin 415 * and exit to caller, that will do the lookup. 416 */ 417 *plocal_sin = &ia->ia_addr; 418 419 } 420 return(0); 421 } 422 423 /* 424 * Outer subroutine: 425 * Connect from a socket to a specified address. 426 * Both address and port must be specified in argument sin. 427 * If don't have a local address for this socket yet, 428 * then pick one. 429 */ 430 int 431 in_pcbconnect(inp, nam, p) 432 register struct inpcb *inp; 433 struct sockaddr *nam; 434 struct proc *p; 435 { 436 struct sockaddr_in *ifaddr; 437 register struct sockaddr_in *sin = (struct sockaddr_in *)nam; 438 int error; 439 440 /* 441 * Call inner routine, to assign local interface address. 442 */ 443 if (error = in_pcbladdr(inp, nam, &ifaddr)) 444 return(error); 445 446 if (in_pcblookup_hash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port, 447 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 448 inp->inp_lport, 0) != NULL) { 449 return (EADDRINUSE); 450 } 451 if (inp->inp_laddr.s_addr == INADDR_ANY) { 452 if (inp->inp_lport == 0) { 453 error = in_pcbbind(inp, (struct sockaddr *)0, p); 454 if (error) 455 return (error); 456 } 457 inp->inp_laddr = ifaddr->sin_addr; 458 } 459 inp->inp_faddr = sin->sin_addr; 460 inp->inp_fport = sin->sin_port; 461 in_pcbrehash(inp); 462 return (0); 463 } 464 465 void 466 in_pcbdisconnect(inp) 467 struct inpcb *inp; 468 { 469 470 inp->inp_faddr.s_addr = INADDR_ANY; 471 inp->inp_fport = 0; 472 in_pcbrehash(inp); 473 if (inp->inp_socket->so_state & SS_NOFDREF) 474 in_pcbdetach(inp); 475 } 476 477 void 478 in_pcbdetach(inp) 479 struct inpcb *inp; 480 { 481 struct socket *so = inp->inp_socket; 482 struct inpcbinfo *ipi = inp->inp_pcbinfo; 483 484 inp->inp_gencnt = ++ipi->ipi_gencnt; 485 in_pcbremlists(inp); 486 so->so_pcb = 0; 487 sofree(so); 488 if (inp->inp_options) 489 (void)m_free(inp->inp_options); 490 if (inp->inp_route.ro_rt) 491 rtfree(inp->inp_route.ro_rt); 492 ip_freemoptions(inp->inp_moptions); 493 zfreei(ipi->ipi_zone, inp); 494 } 495 496 /* 497 * The calling convention of in_setsockaddr() and in_setpeeraddr() was 498 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 499 * in struct pr_usrreqs, so that protocols can just reference then directly 500 * without the need for a wrapper function. The socket must have a valid 501 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 502 * except through a kernel programming error, so it is acceptable to panic 503 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 504 * because there actually /is/ a programming error somewhere... XXX) 505 */ 506 int 507 in_setsockaddr(so, nam) 508 struct socket *so; 509 struct sockaddr **nam; 510 { 511 int s; 512 register struct inpcb *inp; 513 register struct sockaddr_in *sin; 514 515 /* 516 * Do the malloc first in case it blocks. 517 */ 518 MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, M_WAITOK); 519 bzero(sin, sizeof *sin); 520 sin->sin_family = AF_INET; 521 sin->sin_len = sizeof(*sin); 522 523 s = splnet(); 524 inp = sotoinpcb(so); 525 if (!inp) { 526 splx(s); 527 free(sin, M_SONAME); 528 return EINVAL; 529 } 530 sin->sin_port = inp->inp_lport; 531 sin->sin_addr = inp->inp_laddr; 532 splx(s); 533 534 *nam = (struct sockaddr *)sin; 535 return 0; 536 } 537 538 int 539 in_setpeeraddr(so, nam) 540 struct socket *so; 541 struct sockaddr **nam; 542 { 543 int s; 544 struct inpcb *inp; 545 register struct sockaddr_in *sin; 546 547 /* 548 * Do the malloc first in case it blocks. 549 */ 550 MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, M_WAITOK); 551 bzero((caddr_t)sin, sizeof (*sin)); 552 sin->sin_family = AF_INET; 553 sin->sin_len = sizeof(*sin); 554 555 s = splnet(); 556 inp = sotoinpcb(so); 557 if (!inp) { 558 splx(s); 559 free(sin, M_SONAME); 560 return EINVAL; 561 } 562 sin->sin_port = inp->inp_fport; 563 sin->sin_addr = inp->inp_faddr; 564 splx(s); 565 566 *nam = (struct sockaddr *)sin; 567 return 0; 568 } 569 570 /* 571 * Pass some notification to all connections of a protocol 572 * associated with address dst. The local address and/or port numbers 573 * may be specified to limit the search. The "usual action" will be 574 * taken, depending on the ctlinput cmd. The caller must filter any 575 * cmds that are uninteresting (e.g., no error in the map). 576 * Call the protocol specific routine (if any) to report 577 * any errors for each matching socket. 578 */ 579 void 580 in_pcbnotify(head, dst, fport_arg, laddr, lport_arg, cmd, notify) 581 struct inpcbhead *head; 582 struct sockaddr *dst; 583 u_int fport_arg, lport_arg; 584 struct in_addr laddr; 585 int cmd; 586 void (*notify) __P((struct inpcb *, int)); 587 { 588 register struct inpcb *inp, *oinp; 589 struct in_addr faddr; 590 u_short fport = fport_arg, lport = lport_arg; 591 int errno, s; 592 593 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET) 594 return; 595 faddr = ((struct sockaddr_in *)dst)->sin_addr; 596 if (faddr.s_addr == INADDR_ANY) 597 return; 598 599 errno = inetctlerrmap[cmd]; 600 s = splnet(); 601 for (inp = head->lh_first; inp != NULL;) { 602 if (inp->inp_faddr.s_addr != faddr.s_addr || 603 inp->inp_socket == 0 || inp->inp_lport != lport || 604 inp->inp_laddr.s_addr != laddr.s_addr || 605 inp->inp_fport != fport) { 606 inp = inp->inp_list.le_next; 607 continue; 608 } 609 oinp = inp; 610 inp = inp->inp_list.le_next; 611 if (notify) 612 (*notify)(oinp, errno); 613 } 614 splx(s); 615 } 616 617 void 618 in_pcbnotifyall(head, dst, cmd, notify) 619 struct inpcbhead *head; 620 struct sockaddr *dst; 621 int cmd; 622 void (*notify) __P((struct inpcb *, int)); 623 { 624 register struct inpcb *inp, *oinp; 625 struct in_addr faddr; 626 int errno, s; 627 628 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET) 629 return; 630 faddr = ((struct sockaddr_in *)dst)->sin_addr; 631 if (faddr.s_addr == INADDR_ANY) 632 return; 633 634 errno = inetctlerrmap[cmd]; 635 s = splnet(); 636 for (inp = LIST_FIRST(head); inp != NULL;) { 637 #ifdef INET6 638 if ((inp->inp_vflag & INP_IPV4) == 0) { 639 inp = LIST_NEXT(inp, inp_list); 640 continue; 641 } 642 #endif 643 if (inp->inp_faddr.s_addr != faddr.s_addr || inp->inp_socket == 0) { 644 inp = LIST_NEXT(inp, inp_list); 645 continue; 646 } 647 oinp = inp; 648 inp = LIST_NEXT(inp, inp_list); 649 if (notify) 650 (*notify)(oinp, errno); 651 } 652 splx(s); 653 } 654 655 /* 656 * Check for alternatives when higher level complains 657 * about service problems. For now, invalidate cached 658 * routing information. If the route was created dynamically 659 * (by a redirect), time to try a default gateway again. 660 */ 661 void 662 in_losing(inp) 663 struct inpcb *inp; 664 { 665 register struct rtentry *rt; 666 struct rt_addrinfo info; 667 668 if ((rt = inp->inp_route.ro_rt)) { 669 inp->inp_route.ro_rt = 0; 670 bzero((caddr_t)&info, sizeof(info)); 671 info.rti_info[RTAX_DST] = 672 (struct sockaddr *)&inp->inp_route.ro_dst; 673 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 674 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 675 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 676 if (rt->rt_flags & RTF_DYNAMIC) 677 (void) rtrequest(RTM_DELETE, rt_key(rt), 678 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 679 (struct rtentry **)0); 680 else 681 /* 682 * A new route can be allocated 683 * the next time output is attempted. 684 */ 685 rtfree(rt); 686 } 687 } 688 689 /* 690 * After a routing change, flush old routing 691 * and allocate a (hopefully) better one. 692 */ 693 void 694 in_rtchange(inp, errno) 695 register struct inpcb *inp; 696 int errno; 697 { 698 if (inp->inp_route.ro_rt) { 699 rtfree(inp->inp_route.ro_rt); 700 inp->inp_route.ro_rt = 0; 701 /* 702 * A new route can be allocated the next time 703 * output is attempted. 704 */ 705 } 706 } 707 708 /* 709 * Lookup a PCB based on the local address and port. 710 */ 711 struct inpcb * 712 in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 713 struct inpcbinfo *pcbinfo; 714 struct in_addr laddr; 715 u_int lport_arg; 716 int wild_okay; 717 { 718 register struct inpcb *inp; 719 int matchwild = 3, wildcard; 720 u_short lport = lport_arg; 721 722 if (!wild_okay) { 723 struct inpcbhead *head; 724 /* 725 * Look for an unconnected (wildcard foreign addr) PCB that 726 * matches the local address and port we're looking for. 727 */ 728 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)]; 729 for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) { 730 if (inp->inp_faddr.s_addr == INADDR_ANY && 731 inp->inp_laddr.s_addr == laddr.s_addr && 732 inp->inp_lport == lport) { 733 /* 734 * Found. 735 */ 736 return (inp); 737 } 738 } 739 /* 740 * Not found. 741 */ 742 return (NULL); 743 } else { 744 struct inpcbporthead *porthash; 745 struct inpcbport *phd; 746 struct inpcb *match = NULL; 747 /* 748 * Best fit PCB lookup. 749 * 750 * First see if this local port is in use by looking on the 751 * port hash list. 752 */ 753 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 754 pcbinfo->porthashmask)]; 755 for (phd = porthash->lh_first; phd != NULL; phd = phd->phd_hash.le_next) { 756 if (phd->phd_port == lport) 757 break; 758 } 759 if (phd != NULL) { 760 /* 761 * Port is in use by one or more PCBs. Look for best 762 * fit. 763 */ 764 for (inp = phd->phd_pcblist.lh_first; inp != NULL; 765 inp = inp->inp_portlist.le_next) { 766 wildcard = 0; 767 if (inp->inp_faddr.s_addr != INADDR_ANY) 768 wildcard++; 769 if (inp->inp_laddr.s_addr != INADDR_ANY) { 770 if (laddr.s_addr == INADDR_ANY) 771 wildcard++; 772 else if (inp->inp_laddr.s_addr != laddr.s_addr) 773 continue; 774 } else { 775 if (laddr.s_addr != INADDR_ANY) 776 wildcard++; 777 } 778 if (wildcard < matchwild) { 779 match = inp; 780 matchwild = wildcard; 781 if (matchwild == 0) { 782 break; 783 } 784 } 785 } 786 } 787 return (match); 788 } 789 } 790 791 /* 792 * Lookup PCB in hash list. 793 */ 794 struct inpcb * 795 in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard) 796 struct inpcbinfo *pcbinfo; 797 struct in_addr faddr, laddr; 798 u_int fport_arg, lport_arg; 799 int wildcard; 800 { 801 struct inpcbhead *head; 802 register struct inpcb *inp; 803 u_short fport = fport_arg, lport = lport_arg; 804 805 /* 806 * First look for an exact match. 807 */ 808 head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)]; 809 for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) { 810 if (inp->inp_faddr.s_addr == faddr.s_addr && 811 inp->inp_laddr.s_addr == laddr.s_addr && 812 inp->inp_fport == fport && 813 inp->inp_lport == lport) { 814 /* 815 * Found. 816 */ 817 return (inp); 818 } 819 } 820 if (wildcard) { 821 struct inpcb *local_wild = NULL; 822 823 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)]; 824 for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) { 825 if (inp->inp_faddr.s_addr == INADDR_ANY && 826 inp->inp_lport == lport) { 827 if (inp->inp_laddr.s_addr == laddr.s_addr) 828 return (inp); 829 else if (inp->inp_laddr.s_addr == INADDR_ANY) 830 local_wild = inp; 831 } 832 } 833 return (local_wild); 834 } 835 836 /* 837 * Not found. 838 */ 839 return (NULL); 840 } 841 842 /* 843 * Insert PCB onto various hash lists. 844 */ 845 int 846 in_pcbinshash(inp) 847 struct inpcb *inp; 848 { 849 struct inpcbhead *pcbhash; 850 struct inpcbporthead *pcbporthash; 851 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 852 struct inpcbport *phd; 853 854 pcbhash = &pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr, 855 inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)]; 856 857 pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport, 858 pcbinfo->porthashmask)]; 859 860 /* 861 * Go through port list and look for a head for this lport. 862 */ 863 for (phd = pcbporthash->lh_first; phd != NULL; phd = phd->phd_hash.le_next) { 864 if (phd->phd_port == inp->inp_lport) 865 break; 866 } 867 /* 868 * If none exists, malloc one and tack it on. 869 */ 870 if (phd == NULL) { 871 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT); 872 if (phd == NULL) { 873 return (ENOBUFS); /* XXX */ 874 } 875 phd->phd_port = inp->inp_lport; 876 LIST_INIT(&phd->phd_pcblist); 877 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash); 878 } 879 inp->inp_phd = phd; 880 LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); 881 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 882 return (0); 883 } 884 885 /* 886 * Move PCB to the proper hash bucket when { faddr, fport } have been 887 * changed. NOTE: This does not handle the case of the lport changing (the 888 * hashed port list would have to be updated as well), so the lport must 889 * not change after in_pcbinshash() has been called. 890 */ 891 void 892 in_pcbrehash(inp) 893 struct inpcb *inp; 894 { 895 struct inpcbhead *head; 896 897 head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr, 898 inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)]; 899 900 LIST_REMOVE(inp, inp_hash); 901 LIST_INSERT_HEAD(head, inp, inp_hash); 902 } 903 904 /* 905 * Remove PCB from various lists. 906 */ 907 static void 908 in_pcbremlists(inp) 909 struct inpcb *inp; 910 { 911 inp->inp_gencnt = ++inp->inp_pcbinfo->ipi_gencnt; 912 if (inp->inp_lport) { 913 struct inpcbport *phd = inp->inp_phd; 914 915 LIST_REMOVE(inp, inp_hash); 916 LIST_REMOVE(inp, inp_portlist); 917 if (phd->phd_pcblist.lh_first == NULL) { 918 LIST_REMOVE(phd, phd_hash); 919 free(phd, M_PCB); 920 } 921 } 922 LIST_REMOVE(inp, inp_list); 923 inp->inp_pcbinfo->ipi_count--; 924 }
Cache object: f7d1d462e2a2dd757e385a7af5b89259
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]