1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #if !defined(KLD_MODULE) 33 #include "opt_inet.h" 34 #include "opt_ipfw.h" 35 #include "opt_mac.h" 36 #ifndef INET 37 #error "IPDIVERT requires INET." 38 #endif 39 #ifndef IPFIREWALL 40 #error "IPDIVERT requires IPFIREWALL" 41 #endif 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mac.h> 49 #include <sys/mbuf.h> 50 #include <sys/module.h> 51 #include <sys/kernel.h> 52 #include <sys/proc.h> 53 #include <sys/protosw.h> 54 #include <sys/signalvar.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/sx.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 61 #include <vm/uma.h> 62 63 #include <net/if.h> 64 #include <net/route.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_pcb.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/in_var.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip_divert.h> 72 #include <netinet/ip_var.h> 73 #include <netinet/ip_fw.h> 74 75 /* 76 * Divert sockets 77 */ 78 79 /* 80 * Allocate enough space to hold a full IP packet 81 */ 82 #define DIVSNDQ (65536 + 100) 83 #define DIVRCVQ (65536 + 100) 84 85 /* 86 * Divert sockets work in conjunction with ipfw, see the divert(4) 87 * manpage for features. 88 * Internally, packets selected by ipfw in ip_input() or ip_output(), 89 * and never diverted before, are passed to the input queue of the 90 * divert socket with a given 'divert_port' number (as specified in 91 * the matching ipfw rule), and they are tagged with a 16 bit cookie 92 * (representing the rule number of the matching ipfw rule), which 93 * is passed to process reading from the socket. 94 * 95 * Packets written to the divert socket are again tagged with a cookie 96 * (usually the same as above) and a destination address. 97 * If the destination address is INADDR_ANY then the packet is 98 * treated as outgoing and sent to ip_output(), otherwise it is 99 * treated as incoming and sent to ip_input(). 100 * In both cases, the packet is tagged with the cookie. 101 * 102 * On reinjection, processing in ip_input() and ip_output() 103 * will be exactly the same as for the original packet, except that 104 * ipfw processing will start at the rule number after the one 105 * written in the cookie (so, tagging a packet with a cookie of 0 106 * will cause it to be effectively considered as a standard packet). 107 */ 108 109 /* Internal variables. */ 110 static struct inpcbhead divcb; 111 static struct inpcbinfo divcbinfo; 112 113 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 114 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 115 116 /* 117 * Initialize divert connection block queue. 118 */ 119 static void 120 div_zone_change(void *tag) 121 { 122 123 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets); 124 } 125 126 void 127 div_init(void) 128 { 129 INP_INFO_LOCK_INIT(&divcbinfo, "div"); 130 LIST_INIT(&divcb); 131 divcbinfo.listhead = &divcb; 132 /* 133 * XXX We don't use the hash list for divert IP, but it's easier 134 * to allocate a one entry hash list than it is to check all 135 * over the place for hashbase == NULL. 136 */ 137 divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask); 138 divcbinfo.porthashbase = hashinit(1, M_PCB, &divcbinfo.porthashmask); 139 divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb), 140 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 141 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets); 142 EVENTHANDLER_REGISTER(maxsockets_change, div_zone_change, 143 NULL, EVENTHANDLER_PRI_ANY); 144 } 145 146 /* 147 * IPPROTO_DIVERT is not in the real IP protocol number space; this 148 * function should never be called. Just in case, drop any packets. 149 */ 150 void 151 div_input(struct mbuf *m, int off) 152 { 153 ipstat.ips_noproto++; 154 m_freem(m); 155 } 156 157 /* 158 * Divert a packet by passing it up to the divert socket at port 'port'. 159 * 160 * Setup generic address and protocol structures for div_input routine, 161 * then pass them along with mbuf chain. 162 */ 163 static void 164 divert_packet(struct mbuf *m, int incoming) 165 { 166 struct ip *ip; 167 struct inpcb *inp; 168 struct socket *sa; 169 u_int16_t nport; 170 struct sockaddr_in divsrc; 171 struct m_tag *mtag; 172 173 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL); 174 if (mtag == NULL) { 175 printf("%s: no divert tag\n", __func__); 176 m_freem(m); 177 return; 178 } 179 /* Assure header */ 180 if (m->m_len < sizeof(struct ip) && 181 (m = m_pullup(m, sizeof(struct ip))) == 0) 182 return; 183 ip = mtod(m, struct ip *); 184 185 /* Delayed checksums are currently not compatible with divert. */ 186 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 187 ip->ip_len = ntohs(ip->ip_len); 188 in_delayed_cksum(m); 189 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 190 ip->ip_len = htons(ip->ip_len); 191 } 192 193 /* 194 * Record receive interface address, if any. 195 * But only for incoming packets. 196 */ 197 bzero(&divsrc, sizeof(divsrc)); 198 divsrc.sin_len = sizeof(divsrc); 199 divsrc.sin_family = AF_INET; 200 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */ 201 if (incoming) { 202 struct ifaddr *ifa; 203 204 /* Sanity check */ 205 M_ASSERTPKTHDR(m); 206 207 /* Find IP address for receive interface */ 208 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) { 209 if (ifa->ifa_addr->sa_family != AF_INET) 210 continue; 211 divsrc.sin_addr = 212 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 213 break; 214 } 215 } 216 /* 217 * Record the incoming interface name whenever we have one. 218 */ 219 if (m->m_pkthdr.rcvif) { 220 /* 221 * Hide the actual interface name in there in the 222 * sin_zero array. XXX This needs to be moved to a 223 * different sockaddr type for divert, e.g. 224 * sockaddr_div with multiple fields like 225 * sockaddr_dl. Presently we have only 7 bytes 226 * but that will do for now as most interfaces 227 * are 4 or less + 2 or less bytes for unit. 228 * There is probably a faster way of doing this, 229 * possibly taking it from the sockaddr_dl on the iface. 230 * This solves the problem of a P2P link and a LAN interface 231 * having the same address, which can result in the wrong 232 * interface being assigned to the packet when fed back 233 * into the divert socket. Theoretically if the daemon saves 234 * and re-uses the sockaddr_in as suggested in the man pages, 235 * this iface name will come along for the ride. 236 * (see div_output for the other half of this.) 237 */ 238 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname, 239 sizeof(divsrc.sin_zero)); 240 } 241 242 /* Put packet on socket queue, if any */ 243 sa = NULL; 244 nport = htons((u_int16_t)divert_info(mtag)); 245 INP_INFO_RLOCK(&divcbinfo); 246 LIST_FOREACH(inp, &divcb, inp_list) { 247 INP_LOCK(inp); 248 /* XXX why does only one socket match? */ 249 if (inp->inp_lport == nport) { 250 sa = inp->inp_socket; 251 SOCKBUF_LOCK(&sa->so_rcv); 252 if (sbappendaddr_locked(&sa->so_rcv, 253 (struct sockaddr *)&divsrc, m, 254 (struct mbuf *)0) == 0) { 255 SOCKBUF_UNLOCK(&sa->so_rcv); 256 sa = NULL; /* force mbuf reclaim below */ 257 } else 258 sorwakeup_locked(sa); 259 INP_UNLOCK(inp); 260 break; 261 } 262 INP_UNLOCK(inp); 263 } 264 INP_INFO_RUNLOCK(&divcbinfo); 265 if (sa == NULL) { 266 m_freem(m); 267 ipstat.ips_noproto++; 268 ipstat.ips_delivered--; 269 } 270 } 271 272 /* 273 * Deliver packet back into the IP processing machinery. 274 * 275 * If no address specified, or address is 0.0.0.0, send to ip_output(); 276 * otherwise, send to ip_input() and mark as having been received on 277 * the interface with that address. 278 */ 279 static int 280 div_output(struct socket *so, struct mbuf *m, 281 struct sockaddr_in *sin, struct mbuf *control) 282 { 283 struct m_tag *mtag; 284 struct divert_tag *dt; 285 int error = 0; 286 287 /* 288 * An mbuf may hasn't come from userland, but we pretend 289 * that it has. 290 */ 291 m->m_pkthdr.rcvif = NULL; 292 m->m_nextpkt = NULL; 293 294 if (control) 295 m_freem(control); /* XXX */ 296 297 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) { 298 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag), 299 M_NOWAIT | M_ZERO); 300 if (mtag == NULL) { 301 error = ENOBUFS; 302 goto cantsend; 303 } 304 dt = (struct divert_tag *)(mtag+1); 305 m_tag_prepend(m, mtag); 306 } else 307 dt = (struct divert_tag *)(mtag+1); 308 309 /* Loopback avoidance and state recovery */ 310 if (sin) { 311 int i; 312 313 dt->cookie = sin->sin_port; 314 /* 315 * Find receive interface with the given name, stuffed 316 * (if it exists) in the sin_zero[] field. 317 * The name is user supplied data so don't trust its size 318 * or that it is zero terminated. 319 */ 320 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 321 ; 322 if ( i > 0 && i < sizeof(sin->sin_zero)) 323 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 324 } 325 326 /* Reinject packet into the system as incoming or outgoing */ 327 if (!sin || sin->sin_addr.s_addr == 0) { 328 struct ip *const ip = mtod(m, struct ip *); 329 struct inpcb *inp; 330 331 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG; 332 INP_INFO_WLOCK(&divcbinfo); 333 inp = sotoinpcb(so); 334 INP_LOCK(inp); 335 /* 336 * Don't allow both user specified and setsockopt options, 337 * and don't allow packet length sizes that will crash 338 */ 339 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) || 340 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 341 error = EINVAL; 342 m_freem(m); 343 } else { 344 /* Convert fields to host order for ip_output() */ 345 ip->ip_len = ntohs(ip->ip_len); 346 ip->ip_off = ntohs(ip->ip_off); 347 348 /* Send packet to output processing */ 349 ipstat.ips_rawout++; /* XXX */ 350 351 #ifdef MAC 352 mac_create_mbuf_from_inpcb(inp, m); 353 #endif 354 error = ip_output(m, 355 inp->inp_options, NULL, 356 ((so->so_options & SO_DONTROUTE) ? 357 IP_ROUTETOIF : 0) | 358 IP_ALLOWBROADCAST | IP_RAWOUTPUT, 359 inp->inp_moptions, NULL); 360 } 361 INP_UNLOCK(inp); 362 INP_INFO_WUNLOCK(&divcbinfo); 363 } else { 364 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG; 365 if (m->m_pkthdr.rcvif == NULL) { 366 /* 367 * No luck with the name, check by IP address. 368 * Clear the port and the ifname to make sure 369 * there are no distractions for ifa_ifwithaddr. 370 */ 371 struct ifaddr *ifa; 372 373 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 374 sin->sin_port = 0; 375 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 376 if (ifa == NULL) { 377 error = EADDRNOTAVAIL; 378 goto cantsend; 379 } 380 m->m_pkthdr.rcvif = ifa->ifa_ifp; 381 } 382 #ifdef MAC 383 SOCK_LOCK(so); 384 mac_create_mbuf_from_socket(so, m); 385 SOCK_UNLOCK(so); 386 #endif 387 /* Send packet to input processing */ 388 ip_input(m); 389 } 390 391 return error; 392 393 cantsend: 394 m_freem(m); 395 return error; 396 } 397 398 static int 399 div_attach(struct socket *so, int proto, struct thread *td) 400 { 401 struct inpcb *inp; 402 int error; 403 404 inp = sotoinpcb(so); 405 KASSERT(inp == NULL, ("div_attach: inp != NULL")); 406 if (td && (error = suser(td)) != 0) 407 return error; 408 error = soreserve(so, div_sendspace, div_recvspace); 409 if (error) 410 return error; 411 INP_INFO_WLOCK(&divcbinfo); 412 error = in_pcballoc(so, &divcbinfo, "divinp"); 413 if (error) { 414 INP_INFO_WUNLOCK(&divcbinfo); 415 return error; 416 } 417 inp = (struct inpcb *)so->so_pcb; 418 INP_LOCK(inp); 419 INP_INFO_WUNLOCK(&divcbinfo); 420 inp->inp_ip_p = proto; 421 inp->inp_vflag |= INP_IPV4; 422 inp->inp_flags |= INP_HDRINCL; 423 INP_UNLOCK(inp); 424 return 0; 425 } 426 427 static void 428 div_detach(struct socket *so) 429 { 430 struct inpcb *inp; 431 432 inp = sotoinpcb(so); 433 KASSERT(inp != NULL, ("div_detach: inp == NULL")); 434 INP_INFO_WLOCK(&divcbinfo); 435 INP_LOCK(inp); 436 in_pcbdetach(inp); 437 in_pcbfree(inp); 438 INP_INFO_WUNLOCK(&divcbinfo); 439 } 440 441 static int 442 div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 443 { 444 struct inpcb *inp; 445 int error; 446 447 inp = sotoinpcb(so); 448 KASSERT(inp != NULL, ("div_bind: inp == NULL")); 449 /* in_pcbbind assumes that nam is a sockaddr_in 450 * and in_pcbbind requires a valid address. Since divert 451 * sockets don't we need to make sure the address is 452 * filled in properly. 453 * XXX -- divert should not be abusing in_pcbind 454 * and should probably have its own family. 455 */ 456 if (nam->sa_family != AF_INET) 457 return EAFNOSUPPORT; 458 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 459 INP_INFO_WLOCK(&divcbinfo); 460 INP_LOCK(inp); 461 error = in_pcbbind(inp, nam, td->td_ucred); 462 INP_UNLOCK(inp); 463 INP_INFO_WUNLOCK(&divcbinfo); 464 return error; 465 } 466 467 static int 468 div_shutdown(struct socket *so) 469 { 470 struct inpcb *inp; 471 472 inp = sotoinpcb(so); 473 KASSERT(inp != NULL, ("div_shutdown: inp == NULL")); 474 INP_LOCK(inp); 475 socantsendmore(so); 476 INP_UNLOCK(inp); 477 return 0; 478 } 479 480 static int 481 div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 482 struct mbuf *control, struct thread *td) 483 { 484 /* Packet must have a header (but that's about it) */ 485 if (m->m_len < sizeof (struct ip) && 486 (m = m_pullup(m, sizeof (struct ip))) == 0) { 487 ipstat.ips_toosmall++; 488 m_freem(m); 489 return EINVAL; 490 } 491 492 /* Send packet */ 493 return div_output(so, m, (struct sockaddr_in *)nam, control); 494 } 495 496 void 497 div_ctlinput(int cmd, struct sockaddr *sa, void *vip) 498 { 499 struct in_addr faddr; 500 501 faddr = ((struct sockaddr_in *)sa)->sin_addr; 502 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 503 return; 504 if (PRC_IS_REDIRECT(cmd)) 505 return; 506 } 507 508 static int 509 div_pcblist(SYSCTL_HANDLER_ARGS) 510 { 511 int error, i, n; 512 struct inpcb *inp, **inp_list; 513 inp_gen_t gencnt; 514 struct xinpgen xig; 515 516 /* 517 * The process of preparing the TCB list is too time-consuming and 518 * resource-intensive to repeat twice on every request. 519 */ 520 if (req->oldptr == 0) { 521 n = divcbinfo.ipi_count; 522 req->oldidx = 2 * (sizeof xig) 523 + (n + n/8) * sizeof(struct xinpcb); 524 return 0; 525 } 526 527 if (req->newptr != 0) 528 return EPERM; 529 530 /* 531 * OK, now we're committed to doing something. 532 */ 533 INP_INFO_RLOCK(&divcbinfo); 534 gencnt = divcbinfo.ipi_gencnt; 535 n = divcbinfo.ipi_count; 536 INP_INFO_RUNLOCK(&divcbinfo); 537 538 error = sysctl_wire_old_buffer(req, 539 2 * sizeof(xig) + n*sizeof(struct xinpcb)); 540 if (error != 0) 541 return (error); 542 543 xig.xig_len = sizeof xig; 544 xig.xig_count = n; 545 xig.xig_gen = gencnt; 546 xig.xig_sogen = so_gencnt; 547 error = SYSCTL_OUT(req, &xig, sizeof xig); 548 if (error) 549 return error; 550 551 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 552 if (inp_list == 0) 553 return ENOMEM; 554 555 INP_INFO_RLOCK(&divcbinfo); 556 for (inp = LIST_FIRST(divcbinfo.listhead), i = 0; inp && i < n; 557 inp = LIST_NEXT(inp, inp_list)) { 558 INP_LOCK(inp); 559 if (inp->inp_gencnt <= gencnt && 560 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 561 inp_list[i++] = inp; 562 INP_UNLOCK(inp); 563 } 564 INP_INFO_RUNLOCK(&divcbinfo); 565 n = i; 566 567 error = 0; 568 for (i = 0; i < n; i++) { 569 inp = inp_list[i]; 570 if (inp->inp_gencnt <= gencnt) { 571 struct xinpcb xi; 572 bzero(&xi, sizeof(xi)); 573 xi.xi_len = sizeof xi; 574 /* XXX should avoid extra copy */ 575 bcopy(inp, &xi.xi_inp, sizeof *inp); 576 if (inp->inp_socket) 577 sotoxsocket(inp->inp_socket, &xi.xi_socket); 578 error = SYSCTL_OUT(req, &xi, sizeof xi); 579 } 580 } 581 if (!error) { 582 /* 583 * Give the user an updated idea of our state. 584 * If the generation differs from what we told 585 * her before, she knows that something happened 586 * while we were processing this request, and it 587 * might be necessary to retry. 588 */ 589 INP_INFO_RLOCK(&divcbinfo); 590 xig.xig_gen = divcbinfo.ipi_gencnt; 591 xig.xig_sogen = so_gencnt; 592 xig.xig_count = divcbinfo.ipi_count; 593 INP_INFO_RUNLOCK(&divcbinfo); 594 error = SYSCTL_OUT(req, &xig, sizeof xig); 595 } 596 free(inp_list, M_TEMP); 597 return error; 598 } 599 600 /* 601 * This is the wrapper function for in_setsockaddr. We just pass down 602 * the pcbinfo for in_setpeeraddr to lock. 603 */ 604 static int 605 div_sockaddr(struct socket *so, struct sockaddr **nam) 606 { 607 return (in_setsockaddr(so, nam, &divcbinfo)); 608 } 609 610 /* 611 * This is the wrapper function for in_setpeeraddr. We just pass down 612 * the pcbinfo for in_setpeeraddr to lock. 613 */ 614 static int 615 div_peeraddr(struct socket *so, struct sockaddr **nam) 616 { 617 return (in_setpeeraddr(so, nam, &divcbinfo)); 618 } 619 620 #ifdef SYSCTL_NODE 621 SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT"); 622 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0, 623 div_pcblist, "S,xinpcb", "List of active divert sockets"); 624 #endif 625 626 struct pr_usrreqs div_usrreqs = { 627 .pru_attach = div_attach, 628 .pru_bind = div_bind, 629 .pru_control = in_control, 630 .pru_detach = div_detach, 631 .pru_peeraddr = div_peeraddr, 632 .pru_send = div_send, 633 .pru_shutdown = div_shutdown, 634 .pru_sockaddr = div_sockaddr, 635 .pru_sosetlabel = in_pcbsosetlabel 636 }; 637 638 struct protosw div_protosw = { 639 .pr_type = SOCK_RAW, 640 .pr_protocol = IPPROTO_DIVERT, 641 .pr_flags = PR_ATOMIC|PR_ADDR, 642 .pr_input = div_input, 643 .pr_ctlinput = div_ctlinput, 644 .pr_ctloutput = ip_ctloutput, 645 .pr_init = div_init, 646 .pr_usrreqs = &div_usrreqs 647 }; 648 649 static int 650 div_modevent(module_t mod, int type, void *unused) 651 { 652 int err = 0; 653 int n; 654 655 switch (type) { 656 case MOD_LOAD: 657 /* 658 * Protocol will be initialized by pf_proto_register(). 659 * We don't have to register ip_protox because we are not 660 * a true IP protocol that goes over the wire. 661 */ 662 err = pf_proto_register(PF_INET, &div_protosw); 663 ip_divert_ptr = divert_packet; 664 break; 665 case MOD_QUIESCE: 666 /* 667 * IPDIVERT may normally not be unloaded because of the 668 * potential race conditions. Tell kldunload we can't be 669 * unloaded unless the unload is forced. 670 */ 671 err = EPERM; 672 break; 673 case MOD_UNLOAD: 674 /* 675 * Forced unload. 676 * 677 * Module ipdivert can only be unloaded if no sockets are 678 * connected. Maybe this can be changed later to forcefully 679 * disconnect any open sockets. 680 * 681 * XXXRW: Note that there is a slight race here, as a new 682 * socket open request could be spinning on the lock and then 683 * we destroy the lock. 684 */ 685 INP_INFO_WLOCK(&divcbinfo); 686 n = divcbinfo.ipi_count; 687 if (n != 0) { 688 err = EBUSY; 689 INP_INFO_WUNLOCK(&divcbinfo); 690 break; 691 } 692 ip_divert_ptr = NULL; 693 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW); 694 INP_INFO_WUNLOCK(&divcbinfo); 695 INP_INFO_LOCK_DESTROY(&divcbinfo); 696 uma_zdestroy(divcbinfo.ipi_zone); 697 break; 698 default: 699 err = EOPNOTSUPP; 700 break; 701 } 702 return err; 703 } 704 705 static moduledata_t ipdivertmod = { 706 "ipdivert", 707 div_modevent, 708 0 709 }; 710 711 DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); 712 MODULE_DEPEND(dummynet, ipfw, 2, 2, 2); 713 MODULE_VERSION(ipdivert, 1); 714