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 static int 127 div_inpcb_init(void *mem, int size, int flags) 128 { 129 struct inpcb *inp = (struct inpcb *) mem; 130 INP_LOCK_INIT(inp, "inp", "divinp"); 131 return (0); 132 } 133 134 static void 135 div_inpcb_fini(void *mem, int size) 136 { 137 struct inpcb *inp = (struct inpcb *) mem; 138 INP_LOCK_DESTROY(inp); 139 } 140 141 142 void 143 div_init(void) 144 { 145 INP_INFO_LOCK_INIT(&divcbinfo, "div"); 146 LIST_INIT(&divcb); 147 divcbinfo.listhead = &divcb; 148 /* 149 * XXX We don't use the hash list for divert IP, but it's easier 150 * to allocate a one entry hash list than it is to check all 151 * over the place for hashbase == NULL. 152 */ 153 divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask); 154 divcbinfo.porthashbase = hashinit(1, M_PCB, &divcbinfo.porthashmask); 155 divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb), 156 NULL, NULL, div_inpcb_init, div_inpcb_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 157 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets); 158 EVENTHANDLER_REGISTER(maxsockets_change, div_zone_change, 159 NULL, EVENTHANDLER_PRI_ANY); 160 } 161 162 /* 163 * IPPROTO_DIVERT is not in the real IP protocol number space; this 164 * function should never be called. Just in case, drop any packets. 165 */ 166 void 167 div_input(struct mbuf *m, int off) 168 { 169 ipstat.ips_noproto++; 170 m_freem(m); 171 } 172 173 /* 174 * Divert a packet by passing it up to the divert socket at port 'port'. 175 * 176 * Setup generic address and protocol structures for div_input routine, 177 * then pass them along with mbuf chain. 178 */ 179 static void 180 divert_packet(struct mbuf *m, int incoming) 181 { 182 struct ip *ip; 183 struct inpcb *inp; 184 struct socket *sa; 185 u_int16_t nport; 186 struct sockaddr_in divsrc; 187 struct m_tag *mtag; 188 189 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL); 190 if (mtag == NULL) { 191 printf("%s: no divert tag\n", __func__); 192 m_freem(m); 193 return; 194 } 195 /* Assure header */ 196 if (m->m_len < sizeof(struct ip) && 197 (m = m_pullup(m, sizeof(struct ip))) == 0) 198 return; 199 ip = mtod(m, struct ip *); 200 201 /* Delayed checksums are currently not compatible with divert. */ 202 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 203 ip->ip_len = ntohs(ip->ip_len); 204 in_delayed_cksum(m); 205 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 206 ip->ip_len = htons(ip->ip_len); 207 } 208 209 /* 210 * Record receive interface address, if any. 211 * But only for incoming packets. 212 */ 213 bzero(&divsrc, sizeof(divsrc)); 214 divsrc.sin_len = sizeof(divsrc); 215 divsrc.sin_family = AF_INET; 216 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */ 217 if (incoming) { 218 struct ifaddr *ifa; 219 220 /* Sanity check */ 221 M_ASSERTPKTHDR(m); 222 223 /* Find IP address for receive interface */ 224 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) { 225 if (ifa->ifa_addr->sa_family != AF_INET) 226 continue; 227 divsrc.sin_addr = 228 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 229 break; 230 } 231 } 232 /* 233 * Record the incoming interface name whenever we have one. 234 */ 235 if (m->m_pkthdr.rcvif) { 236 /* 237 * Hide the actual interface name in there in the 238 * sin_zero array. XXX This needs to be moved to a 239 * different sockaddr type for divert, e.g. 240 * sockaddr_div with multiple fields like 241 * sockaddr_dl. Presently we have only 7 bytes 242 * but that will do for now as most interfaces 243 * are 4 or less + 2 or less bytes for unit. 244 * There is probably a faster way of doing this, 245 * possibly taking it from the sockaddr_dl on the iface. 246 * This solves the problem of a P2P link and a LAN interface 247 * having the same address, which can result in the wrong 248 * interface being assigned to the packet when fed back 249 * into the divert socket. Theoretically if the daemon saves 250 * and re-uses the sockaddr_in as suggested in the man pages, 251 * this iface name will come along for the ride. 252 * (see div_output for the other half of this.) 253 */ 254 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname, 255 sizeof(divsrc.sin_zero)); 256 } 257 258 /* Put packet on socket queue, if any */ 259 sa = NULL; 260 nport = htons((u_int16_t)divert_info(mtag)); 261 INP_INFO_RLOCK(&divcbinfo); 262 LIST_FOREACH(inp, &divcb, inp_list) { 263 INP_LOCK(inp); 264 /* XXX why does only one socket match? */ 265 if (inp->inp_lport == nport) { 266 sa = inp->inp_socket; 267 SOCKBUF_LOCK(&sa->so_rcv); 268 if (sbappendaddr_locked(&sa->so_rcv, 269 (struct sockaddr *)&divsrc, m, 270 (struct mbuf *)0) == 0) { 271 SOCKBUF_UNLOCK(&sa->so_rcv); 272 sa = NULL; /* force mbuf reclaim below */ 273 } else 274 sorwakeup_locked(sa); 275 INP_UNLOCK(inp); 276 break; 277 } 278 INP_UNLOCK(inp); 279 } 280 INP_INFO_RUNLOCK(&divcbinfo); 281 if (sa == NULL) { 282 m_freem(m); 283 ipstat.ips_noproto++; 284 ipstat.ips_delivered--; 285 } 286 } 287 288 /* 289 * Deliver packet back into the IP processing machinery. 290 * 291 * If no address specified, or address is 0.0.0.0, send to ip_output(); 292 * otherwise, send to ip_input() and mark as having been received on 293 * the interface with that address. 294 */ 295 static int 296 div_output(struct socket *so, struct mbuf *m, 297 struct sockaddr_in *sin, struct mbuf *control) 298 { 299 struct m_tag *mtag; 300 struct divert_tag *dt; 301 int error = 0; 302 303 /* 304 * An mbuf may hasn't come from userland, but we pretend 305 * that it has. 306 */ 307 m->m_pkthdr.rcvif = NULL; 308 m->m_nextpkt = NULL; 309 310 if (control) 311 m_freem(control); /* XXX */ 312 313 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) { 314 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag), 315 M_NOWAIT | M_ZERO); 316 if (mtag == NULL) { 317 error = ENOBUFS; 318 goto cantsend; 319 } 320 dt = (struct divert_tag *)(mtag+1); 321 m_tag_prepend(m, mtag); 322 } else 323 dt = (struct divert_tag *)(mtag+1); 324 325 /* Loopback avoidance and state recovery */ 326 if (sin) { 327 int i; 328 329 dt->cookie = sin->sin_port; 330 /* 331 * Find receive interface with the given name, stuffed 332 * (if it exists) in the sin_zero[] field. 333 * The name is user supplied data so don't trust its size 334 * or that it is zero terminated. 335 */ 336 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 337 ; 338 if ( i > 0 && i < sizeof(sin->sin_zero)) 339 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 340 } 341 342 /* Reinject packet into the system as incoming or outgoing */ 343 if (!sin || sin->sin_addr.s_addr == 0) { 344 struct ip *const ip = mtod(m, struct ip *); 345 struct inpcb *inp; 346 347 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG; 348 INP_INFO_WLOCK(&divcbinfo); 349 inp = sotoinpcb(so); 350 INP_LOCK(inp); 351 /* 352 * Don't allow both user specified and setsockopt options, 353 * and don't allow packet length sizes that will crash 354 */ 355 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) || 356 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 357 error = EINVAL; 358 m_freem(m); 359 } else { 360 /* Convert fields to host order for ip_output() */ 361 ip->ip_len = ntohs(ip->ip_len); 362 ip->ip_off = ntohs(ip->ip_off); 363 364 /* Send packet to output processing */ 365 ipstat.ips_rawout++; /* XXX */ 366 367 #ifdef MAC 368 mac_create_mbuf_from_inpcb(inp, m); 369 #endif 370 error = ip_output(m, 371 inp->inp_options, NULL, 372 ((so->so_options & SO_DONTROUTE) ? 373 IP_ROUTETOIF : 0) | 374 IP_ALLOWBROADCAST | IP_RAWOUTPUT, 375 inp->inp_moptions, NULL); 376 } 377 INP_UNLOCK(inp); 378 INP_INFO_WUNLOCK(&divcbinfo); 379 } else { 380 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG; 381 if (m->m_pkthdr.rcvif == NULL) { 382 /* 383 * No luck with the name, check by IP address. 384 * Clear the port and the ifname to make sure 385 * there are no distractions for ifa_ifwithaddr. 386 */ 387 struct ifaddr *ifa; 388 389 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 390 sin->sin_port = 0; 391 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 392 if (ifa == NULL) { 393 error = EADDRNOTAVAIL; 394 goto cantsend; 395 } 396 m->m_pkthdr.rcvif = ifa->ifa_ifp; 397 } 398 #ifdef MAC 399 SOCK_LOCK(so); 400 mac_create_mbuf_from_socket(so, m); 401 SOCK_UNLOCK(so); 402 #endif 403 /* Send packet to input processing */ 404 ip_input(m); 405 } 406 407 return error; 408 409 cantsend: 410 m_freem(m); 411 return error; 412 } 413 414 static int 415 div_attach(struct socket *so, int proto, struct thread *td) 416 { 417 struct inpcb *inp; 418 int error; 419 420 inp = sotoinpcb(so); 421 KASSERT(inp == NULL, ("div_attach: inp != NULL")); 422 if (td && (error = suser(td)) != 0) 423 return error; 424 error = soreserve(so, div_sendspace, div_recvspace); 425 if (error) 426 return error; 427 INP_INFO_WLOCK(&divcbinfo); 428 error = in_pcballoc(so, &divcbinfo); 429 if (error) { 430 INP_INFO_WUNLOCK(&divcbinfo); 431 return error; 432 } 433 inp = (struct inpcb *)so->so_pcb; 434 INP_INFO_WUNLOCK(&divcbinfo); 435 inp->inp_ip_p = proto; 436 inp->inp_vflag |= INP_IPV4; 437 inp->inp_flags |= INP_HDRINCL; 438 INP_UNLOCK(inp); 439 return 0; 440 } 441 442 static void 443 div_detach(struct socket *so) 444 { 445 struct inpcb *inp; 446 447 inp = sotoinpcb(so); 448 KASSERT(inp != NULL, ("div_detach: inp == NULL")); 449 INP_INFO_WLOCK(&divcbinfo); 450 INP_LOCK(inp); 451 in_pcbdetach(inp); 452 in_pcbfree(inp); 453 INP_INFO_WUNLOCK(&divcbinfo); 454 } 455 456 static int 457 div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 458 { 459 struct inpcb *inp; 460 int error; 461 462 inp = sotoinpcb(so); 463 KASSERT(inp != NULL, ("div_bind: inp == NULL")); 464 /* in_pcbbind assumes that nam is a sockaddr_in 465 * and in_pcbbind requires a valid address. Since divert 466 * sockets don't we need to make sure the address is 467 * filled in properly. 468 * XXX -- divert should not be abusing in_pcbind 469 * and should probably have its own family. 470 */ 471 if (nam->sa_family != AF_INET) 472 return EAFNOSUPPORT; 473 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 474 INP_INFO_WLOCK(&divcbinfo); 475 INP_LOCK(inp); 476 error = in_pcbbind(inp, nam, td->td_ucred); 477 INP_UNLOCK(inp); 478 INP_INFO_WUNLOCK(&divcbinfo); 479 return error; 480 } 481 482 static int 483 div_shutdown(struct socket *so) 484 { 485 struct inpcb *inp; 486 487 inp = sotoinpcb(so); 488 KASSERT(inp != NULL, ("div_shutdown: inp == NULL")); 489 INP_LOCK(inp); 490 socantsendmore(so); 491 INP_UNLOCK(inp); 492 return 0; 493 } 494 495 static int 496 div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 497 struct mbuf *control, struct thread *td) 498 { 499 /* Packet must have a header (but that's about it) */ 500 if (m->m_len < sizeof (struct ip) && 501 (m = m_pullup(m, sizeof (struct ip))) == 0) { 502 ipstat.ips_toosmall++; 503 m_freem(m); 504 return EINVAL; 505 } 506 507 /* Send packet */ 508 return div_output(so, m, (struct sockaddr_in *)nam, control); 509 } 510 511 void 512 div_ctlinput(int cmd, struct sockaddr *sa, void *vip) 513 { 514 struct in_addr faddr; 515 516 faddr = ((struct sockaddr_in *)sa)->sin_addr; 517 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 518 return; 519 if (PRC_IS_REDIRECT(cmd)) 520 return; 521 } 522 523 static int 524 div_pcblist(SYSCTL_HANDLER_ARGS) 525 { 526 int error, i, n; 527 struct inpcb *inp, **inp_list; 528 inp_gen_t gencnt; 529 struct xinpgen xig; 530 531 /* 532 * The process of preparing the TCB list is too time-consuming and 533 * resource-intensive to repeat twice on every request. 534 */ 535 if (req->oldptr == 0) { 536 n = divcbinfo.ipi_count; 537 req->oldidx = 2 * (sizeof xig) 538 + (n + n/8) * sizeof(struct xinpcb); 539 return 0; 540 } 541 542 if (req->newptr != 0) 543 return EPERM; 544 545 /* 546 * OK, now we're committed to doing something. 547 */ 548 INP_INFO_RLOCK(&divcbinfo); 549 gencnt = divcbinfo.ipi_gencnt; 550 n = divcbinfo.ipi_count; 551 INP_INFO_RUNLOCK(&divcbinfo); 552 553 error = sysctl_wire_old_buffer(req, 554 2 * sizeof(xig) + n*sizeof(struct xinpcb)); 555 if (error != 0) 556 return (error); 557 558 xig.xig_len = sizeof xig; 559 xig.xig_count = n; 560 xig.xig_gen = gencnt; 561 xig.xig_sogen = so_gencnt; 562 error = SYSCTL_OUT(req, &xig, sizeof xig); 563 if (error) 564 return error; 565 566 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 567 if (inp_list == 0) 568 return ENOMEM; 569 570 INP_INFO_RLOCK(&divcbinfo); 571 for (inp = LIST_FIRST(divcbinfo.listhead), i = 0; inp && i < n; 572 inp = LIST_NEXT(inp, inp_list)) { 573 INP_LOCK(inp); 574 if (inp->inp_gencnt <= gencnt && 575 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 576 inp_list[i++] = inp; 577 INP_UNLOCK(inp); 578 } 579 INP_INFO_RUNLOCK(&divcbinfo); 580 n = i; 581 582 error = 0; 583 for (i = 0; i < n; i++) { 584 inp = inp_list[i]; 585 INP_LOCK(inp); 586 if (inp->inp_gencnt <= gencnt) { 587 struct xinpcb xi; 588 bzero(&xi, sizeof(xi)); 589 xi.xi_len = sizeof xi; 590 /* XXX should avoid extra copy */ 591 bcopy(inp, &xi.xi_inp, sizeof *inp); 592 if (inp->inp_socket) 593 sotoxsocket(inp->inp_socket, &xi.xi_socket); 594 INP_UNLOCK(inp); 595 error = SYSCTL_OUT(req, &xi, sizeof xi); 596 } else 597 INP_UNLOCK(inp); 598 } 599 if (!error) { 600 /* 601 * Give the user an updated idea of our state. 602 * If the generation differs from what we told 603 * her before, she knows that something happened 604 * while we were processing this request, and it 605 * might be necessary to retry. 606 */ 607 INP_INFO_RLOCK(&divcbinfo); 608 xig.xig_gen = divcbinfo.ipi_gencnt; 609 xig.xig_sogen = so_gencnt; 610 xig.xig_count = divcbinfo.ipi_count; 611 INP_INFO_RUNLOCK(&divcbinfo); 612 error = SYSCTL_OUT(req, &xig, sizeof xig); 613 } 614 free(inp_list, M_TEMP); 615 return error; 616 } 617 618 /* 619 * This is the wrapper function for in_setsockaddr. We just pass down 620 * the pcbinfo for in_setpeeraddr to lock. 621 */ 622 static int 623 div_sockaddr(struct socket *so, struct sockaddr **nam) 624 { 625 return (in_setsockaddr(so, nam, &divcbinfo)); 626 } 627 628 /* 629 * This is the wrapper function for in_setpeeraddr. We just pass down 630 * the pcbinfo for in_setpeeraddr to lock. 631 */ 632 static int 633 div_peeraddr(struct socket *so, struct sockaddr **nam) 634 { 635 return (in_setpeeraddr(so, nam, &divcbinfo)); 636 } 637 638 #ifdef SYSCTL_NODE 639 SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT"); 640 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0, 641 div_pcblist, "S,xinpcb", "List of active divert sockets"); 642 #endif 643 644 struct pr_usrreqs div_usrreqs = { 645 .pru_attach = div_attach, 646 .pru_bind = div_bind, 647 .pru_control = in_control, 648 .pru_detach = div_detach, 649 .pru_peeraddr = div_peeraddr, 650 .pru_send = div_send, 651 .pru_shutdown = div_shutdown, 652 .pru_sockaddr = div_sockaddr, 653 .pru_sosetlabel = in_pcbsosetlabel 654 }; 655 656 struct protosw div_protosw = { 657 .pr_type = SOCK_RAW, 658 .pr_protocol = IPPROTO_DIVERT, 659 .pr_flags = PR_ATOMIC|PR_ADDR, 660 .pr_input = div_input, 661 .pr_ctlinput = div_ctlinput, 662 .pr_ctloutput = ip_ctloutput, 663 .pr_init = div_init, 664 .pr_usrreqs = &div_usrreqs 665 }; 666 667 static int 668 div_modevent(module_t mod, int type, void *unused) 669 { 670 int err = 0; 671 int n; 672 673 switch (type) { 674 case MOD_LOAD: 675 /* 676 * Protocol will be initialized by pf_proto_register(). 677 * We don't have to register ip_protox because we are not 678 * a true IP protocol that goes over the wire. 679 */ 680 err = pf_proto_register(PF_INET, &div_protosw); 681 ip_divert_ptr = divert_packet; 682 break; 683 case MOD_QUIESCE: 684 /* 685 * IPDIVERT may normally not be unloaded because of the 686 * potential race conditions. Tell kldunload we can't be 687 * unloaded unless the unload is forced. 688 */ 689 err = EPERM; 690 break; 691 case MOD_UNLOAD: 692 /* 693 * Forced unload. 694 * 695 * Module ipdivert can only be unloaded if no sockets are 696 * connected. Maybe this can be changed later to forcefully 697 * disconnect any open sockets. 698 * 699 * XXXRW: Note that there is a slight race here, as a new 700 * socket open request could be spinning on the lock and then 701 * we destroy the lock. 702 */ 703 INP_INFO_WLOCK(&divcbinfo); 704 n = divcbinfo.ipi_count; 705 if (n != 0) { 706 err = EBUSY; 707 INP_INFO_WUNLOCK(&divcbinfo); 708 break; 709 } 710 ip_divert_ptr = NULL; 711 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW); 712 INP_INFO_WUNLOCK(&divcbinfo); 713 INP_INFO_LOCK_DESTROY(&divcbinfo); 714 uma_zdestroy(divcbinfo.ipi_zone); 715 break; 716 default: 717 err = EOPNOTSUPP; 718 break; 719 } 720 return err; 721 } 722 723 static moduledata_t ipdivertmod = { 724 "ipdivert", 725 div_modevent, 726 0 727 }; 728 729 DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); 730 MODULE_DEPEND(dummynet, ipfw, 2, 2, 2); 731 MODULE_VERSION(ipdivert, 1); 732