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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #if !defined(KLD_MODULE) 34 #include "opt_inet.h" 35 #include "opt_ipfw.h" 36 #include "opt_mac.h" 37 #ifndef INET 38 #error "IPDIVERT requires INET." 39 #endif 40 #ifndef IPFIREWALL 41 #error "IPDIVERT requires IPFIREWALL" 42 #endif 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/module.h> 51 #include <sys/kernel.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/protosw.h> 55 #include <sys/signalvar.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sx.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 #include <sys/vimage.h> 62 63 #include <vm/uma.h> 64 65 #include <net/if.h> 66 #include <net/netisr.h> 67 #include <net/route.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_pcb.h> 71 #include <netinet/in_systm.h> 72 #include <netinet/in_var.h> 73 #include <netinet/ip.h> 74 #include <netinet/ip_divert.h> 75 #include <netinet/ip_var.h> 76 #include <netinet/ip_fw.h> 77 #include <netinet/vinet.h> 78 79 #include <security/mac/mac_framework.h> 80 81 /* 82 * Divert sockets 83 */ 84 85 /* 86 * Allocate enough space to hold a full IP packet 87 */ 88 #define DIVSNDQ (65536 + 100) 89 #define DIVRCVQ (65536 + 100) 90 91 /* 92 * Divert sockets work in conjunction with ipfw, see the divert(4) 93 * manpage for features. 94 * Internally, packets selected by ipfw in ip_input() or ip_output(), 95 * and never diverted before, are passed to the input queue of the 96 * divert socket with a given 'divert_port' number (as specified in 97 * the matching ipfw rule), and they are tagged with a 16 bit cookie 98 * (representing the rule number of the matching ipfw rule), which 99 * is passed to process reading from the socket. 100 * 101 * Packets written to the divert socket are again tagged with a cookie 102 * (usually the same as above) and a destination address. 103 * If the destination address is INADDR_ANY then the packet is 104 * treated as outgoing and sent to ip_output(), otherwise it is 105 * treated as incoming and sent to ip_input(). 106 * In both cases, the packet is tagged with the cookie. 107 * 108 * On reinjection, processing in ip_input() and ip_output() 109 * will be exactly the same as for the original packet, except that 110 * ipfw processing will start at the rule number after the one 111 * written in the cookie (so, tagging a packet with a cookie of 0 112 * will cause it to be effectively considered as a standard packet). 113 */ 114 115 /* Internal variables. */ 116 #ifdef VIMAGE_GLOBALS 117 static struct inpcbhead divcb; 118 static struct inpcbinfo divcbinfo; 119 #endif 120 121 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 122 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 123 124 /* 125 * Initialize divert connection block queue. 126 */ 127 static void 128 div_zone_change(void *tag) 129 { 130 131 uma_zone_set_max(V_divcbinfo.ipi_zone, maxsockets); 132 } 133 134 static int 135 div_inpcb_init(void *mem, int size, int flags) 136 { 137 struct inpcb *inp = mem; 138 139 INP_LOCK_INIT(inp, "inp", "divinp"); 140 return (0); 141 } 142 143 static void 144 div_inpcb_fini(void *mem, int size) 145 { 146 struct inpcb *inp = mem; 147 148 INP_LOCK_DESTROY(inp); 149 } 150 151 void 152 div_init(void) 153 { 154 INIT_VNET_INET(curvnet); 155 156 INP_INFO_LOCK_INIT(&V_divcbinfo, "div"); 157 LIST_INIT(&V_divcb); 158 V_divcbinfo.ipi_listhead = &V_divcb; 159 /* 160 * XXX We don't use the hash list for divert IP, but it's easier 161 * to allocate a one entry hash list than it is to check all 162 * over the place for hashbase == NULL. 163 */ 164 V_divcbinfo.ipi_hashbase = hashinit(1, M_PCB, &V_divcbinfo.ipi_hashmask); 165 V_divcbinfo.ipi_porthashbase = hashinit(1, M_PCB, 166 &V_divcbinfo.ipi_porthashmask); 167 V_divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb), 168 NULL, NULL, div_inpcb_init, div_inpcb_fini, UMA_ALIGN_PTR, 169 UMA_ZONE_NOFREE); 170 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets); 171 EVENTHANDLER_REGISTER(maxsockets_change, div_zone_change, 172 NULL, EVENTHANDLER_PRI_ANY); 173 } 174 175 /* 176 * IPPROTO_DIVERT is not in the real IP protocol number space; this 177 * function should never be called. Just in case, drop any packets. 178 */ 179 void 180 div_input(struct mbuf *m, int off) 181 { 182 INIT_VNET_INET(curvnet); 183 184 V_ipstat.ips_noproto++; 185 m_freem(m); 186 } 187 188 /* 189 * Divert a packet by passing it up to the divert socket at port 'port'. 190 * 191 * Setup generic address and protocol structures for div_input routine, 192 * then pass them along with mbuf chain. 193 */ 194 static void 195 divert_packet(struct mbuf *m, int incoming) 196 { 197 INIT_VNET_INET(curvnet); 198 struct ip *ip; 199 struct inpcb *inp; 200 struct socket *sa; 201 u_int16_t nport; 202 struct sockaddr_in divsrc; 203 struct m_tag *mtag; 204 205 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL); 206 if (mtag == NULL) { 207 printf("%s: no divert tag\n", __func__); 208 m_freem(m); 209 return; 210 } 211 /* Assure header */ 212 if (m->m_len < sizeof(struct ip) && 213 (m = m_pullup(m, sizeof(struct ip))) == 0) 214 return; 215 ip = mtod(m, struct ip *); 216 217 /* Delayed checksums are currently not compatible with divert. */ 218 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 219 ip->ip_len = ntohs(ip->ip_len); 220 in_delayed_cksum(m); 221 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 222 ip->ip_len = htons(ip->ip_len); 223 } 224 225 /* 226 * Record receive interface address, if any. 227 * But only for incoming packets. 228 */ 229 bzero(&divsrc, sizeof(divsrc)); 230 divsrc.sin_len = sizeof(divsrc); 231 divsrc.sin_family = AF_INET; 232 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */ 233 if (incoming) { 234 struct ifaddr *ifa; 235 236 /* Sanity check */ 237 M_ASSERTPKTHDR(m); 238 239 /* Find IP address for receive interface */ 240 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) { 241 if (ifa->ifa_addr->sa_family != AF_INET) 242 continue; 243 divsrc.sin_addr = 244 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 245 break; 246 } 247 } 248 /* 249 * Record the incoming interface name whenever we have one. 250 */ 251 if (m->m_pkthdr.rcvif) { 252 /* 253 * Hide the actual interface name in there in the 254 * sin_zero array. XXX This needs to be moved to a 255 * different sockaddr type for divert, e.g. 256 * sockaddr_div with multiple fields like 257 * sockaddr_dl. Presently we have only 7 bytes 258 * but that will do for now as most interfaces 259 * are 4 or less + 2 or less bytes for unit. 260 * There is probably a faster way of doing this, 261 * possibly taking it from the sockaddr_dl on the iface. 262 * This solves the problem of a P2P link and a LAN interface 263 * having the same address, which can result in the wrong 264 * interface being assigned to the packet when fed back 265 * into the divert socket. Theoretically if the daemon saves 266 * and re-uses the sockaddr_in as suggested in the man pages, 267 * this iface name will come along for the ride. 268 * (see div_output for the other half of this.) 269 */ 270 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname, 271 sizeof(divsrc.sin_zero)); 272 } 273 274 /* Put packet on socket queue, if any */ 275 sa = NULL; 276 nport = htons((u_int16_t)divert_info(mtag)); 277 INP_INFO_RLOCK(&V_divcbinfo); 278 LIST_FOREACH(inp, &V_divcb, inp_list) { 279 /* XXX why does only one socket match? */ 280 if (inp->inp_lport == nport) { 281 INP_RLOCK(inp); 282 sa = inp->inp_socket; 283 SOCKBUF_LOCK(&sa->so_rcv); 284 if (sbappendaddr_locked(&sa->so_rcv, 285 (struct sockaddr *)&divsrc, m, 286 (struct mbuf *)0) == 0) { 287 SOCKBUF_UNLOCK(&sa->so_rcv); 288 sa = NULL; /* force mbuf reclaim below */ 289 } else 290 sorwakeup_locked(sa); 291 INP_RUNLOCK(inp); 292 break; 293 } 294 } 295 INP_INFO_RUNLOCK(&V_divcbinfo); 296 if (sa == NULL) { 297 m_freem(m); 298 V_ipstat.ips_noproto++; 299 V_ipstat.ips_delivered--; 300 } 301 } 302 303 /* 304 * Deliver packet back into the IP processing machinery. 305 * 306 * If no address specified, or address is 0.0.0.0, send to ip_output(); 307 * otherwise, send to ip_input() and mark as having been received on 308 * the interface with that address. 309 */ 310 static int 311 div_output(struct socket *so, struct mbuf *m, struct sockaddr_in *sin, 312 struct mbuf *control) 313 { 314 INIT_VNET_INET(curvnet); 315 struct m_tag *mtag; 316 struct divert_tag *dt; 317 int error = 0; 318 struct mbuf *options; 319 320 /* 321 * An mbuf may hasn't come from userland, but we pretend 322 * that it has. 323 */ 324 m->m_pkthdr.rcvif = NULL; 325 m->m_nextpkt = NULL; 326 M_SETFIB(m, so->so_fibnum); 327 328 if (control) 329 m_freem(control); /* XXX */ 330 331 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) { 332 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag), 333 M_NOWAIT | M_ZERO); 334 if (mtag == NULL) { 335 error = ENOBUFS; 336 goto cantsend; 337 } 338 dt = (struct divert_tag *)(mtag+1); 339 m_tag_prepend(m, mtag); 340 } else 341 dt = (struct divert_tag *)(mtag+1); 342 343 /* Loopback avoidance and state recovery */ 344 if (sin) { 345 int i; 346 347 dt->cookie = sin->sin_port; 348 /* 349 * Find receive interface with the given name, stuffed 350 * (if it exists) in the sin_zero[] field. 351 * The name is user supplied data so don't trust its size 352 * or that it is zero terminated. 353 */ 354 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 355 ; 356 if ( i > 0 && i < sizeof(sin->sin_zero)) 357 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 358 } 359 360 /* Reinject packet into the system as incoming or outgoing */ 361 if (!sin || sin->sin_addr.s_addr == 0) { 362 struct ip *const ip = mtod(m, struct ip *); 363 struct inpcb *inp; 364 365 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG; 366 INP_INFO_WLOCK(&V_divcbinfo); 367 inp = sotoinpcb(so); 368 INP_RLOCK(inp); 369 /* 370 * Don't allow both user specified and setsockopt options, 371 * and don't allow packet length sizes that will crash 372 */ 373 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) || 374 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 375 error = EINVAL; 376 INP_RUNLOCK(inp); 377 INP_INFO_WUNLOCK(&V_divcbinfo); 378 m_freem(m); 379 } else { 380 /* Convert fields to host order for ip_output() */ 381 ip->ip_len = ntohs(ip->ip_len); 382 ip->ip_off = ntohs(ip->ip_off); 383 384 /* Send packet to output processing */ 385 V_ipstat.ips_rawout++; /* XXX */ 386 387 #ifdef MAC 388 mac_inpcb_create_mbuf(inp, m); 389 #endif 390 /* 391 * Get ready to inject the packet into ip_output(). 392 * Just in case socket options were specified on the 393 * divert socket, we duplicate them. This is done 394 * to avoid having to hold the PCB locks over the call 395 * to ip_output(), as doing this results in a number of 396 * lock ordering complexities. 397 * 398 * Note that we set the multicast options argument for 399 * ip_output() to NULL since it should be invariant that 400 * they are not present. 401 */ 402 KASSERT(inp->inp_moptions == NULL, 403 ("multicast options set on a divert socket")); 404 options = NULL; 405 /* 406 * XXXCSJP: It is unclear to me whether or not it makes 407 * sense for divert sockets to have options. However, 408 * for now we will duplicate them with the INP locks 409 * held so we can use them in ip_output() without 410 * requring a reference to the pcb. 411 */ 412 if (inp->inp_options != NULL) { 413 options = m_dup(inp->inp_options, M_DONTWAIT); 414 if (options == NULL) 415 error = ENOBUFS; 416 } 417 INP_RUNLOCK(inp); 418 INP_INFO_WUNLOCK(&V_divcbinfo); 419 if (error == ENOBUFS) { 420 m_freem(m); 421 return (error); 422 } 423 error = ip_output(m, options, NULL, 424 ((so->so_options & SO_DONTROUTE) ? 425 IP_ROUTETOIF : 0) | IP_ALLOWBROADCAST | 426 IP_RAWOUTPUT, NULL, NULL); 427 if (options != NULL) 428 m_freem(options); 429 } 430 } else { 431 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG; 432 if (m->m_pkthdr.rcvif == NULL) { 433 /* 434 * No luck with the name, check by IP address. 435 * Clear the port and the ifname to make sure 436 * there are no distractions for ifa_ifwithaddr. 437 */ 438 struct ifaddr *ifa; 439 440 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 441 sin->sin_port = 0; 442 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 443 if (ifa == NULL) { 444 error = EADDRNOTAVAIL; 445 goto cantsend; 446 } 447 m->m_pkthdr.rcvif = ifa->ifa_ifp; 448 } 449 #ifdef MAC 450 SOCK_LOCK(so); 451 mac_socket_create_mbuf(so, m); 452 SOCK_UNLOCK(so); 453 #endif 454 /* Send packet to input processing via netisr */ 455 netisr_queue(NETISR_IP, m); 456 } 457 458 return error; 459 460 cantsend: 461 m_freem(m); 462 return error; 463 } 464 465 static int 466 div_attach(struct socket *so, int proto, struct thread *td) 467 { 468 INIT_VNET_INET(so->so_vnet); 469 struct inpcb *inp; 470 int error; 471 472 inp = sotoinpcb(so); 473 KASSERT(inp == NULL, ("div_attach: inp != NULL")); 474 if (td != NULL) { 475 error = priv_check(td, PRIV_NETINET_DIVERT); 476 if (error) 477 return (error); 478 } 479 error = soreserve(so, div_sendspace, div_recvspace); 480 if (error) 481 return error; 482 INP_INFO_WLOCK(&V_divcbinfo); 483 error = in_pcballoc(so, &V_divcbinfo); 484 if (error) { 485 INP_INFO_WUNLOCK(&V_divcbinfo); 486 return error; 487 } 488 inp = (struct inpcb *)so->so_pcb; 489 INP_INFO_WUNLOCK(&V_divcbinfo); 490 inp->inp_ip_p = proto; 491 inp->inp_vflag |= INP_IPV4; 492 inp->inp_flags |= INP_HDRINCL; 493 INP_WUNLOCK(inp); 494 return 0; 495 } 496 497 static void 498 div_detach(struct socket *so) 499 { 500 INIT_VNET_INET(so->so_vnet); 501 struct inpcb *inp; 502 503 inp = sotoinpcb(so); 504 KASSERT(inp != NULL, ("div_detach: inp == NULL")); 505 INP_INFO_WLOCK(&V_divcbinfo); 506 INP_WLOCK(inp); 507 in_pcbdetach(inp); 508 in_pcbfree(inp); 509 INP_INFO_WUNLOCK(&V_divcbinfo); 510 } 511 512 static int 513 div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 514 { 515 INIT_VNET_INET(so->so_vnet); 516 struct inpcb *inp; 517 int error; 518 519 inp = sotoinpcb(so); 520 KASSERT(inp != NULL, ("div_bind: inp == NULL")); 521 /* in_pcbbind assumes that nam is a sockaddr_in 522 * and in_pcbbind requires a valid address. Since divert 523 * sockets don't we need to make sure the address is 524 * filled in properly. 525 * XXX -- divert should not be abusing in_pcbind 526 * and should probably have its own family. 527 */ 528 if (nam->sa_family != AF_INET) 529 return EAFNOSUPPORT; 530 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 531 INP_INFO_WLOCK(&V_divcbinfo); 532 INP_WLOCK(inp); 533 error = in_pcbbind(inp, nam, td->td_ucred); 534 INP_WUNLOCK(inp); 535 INP_INFO_WUNLOCK(&V_divcbinfo); 536 return error; 537 } 538 539 static int 540 div_shutdown(struct socket *so) 541 { 542 struct inpcb *inp; 543 544 inp = sotoinpcb(so); 545 KASSERT(inp != NULL, ("div_shutdown: inp == NULL")); 546 INP_WLOCK(inp); 547 socantsendmore(so); 548 INP_WUNLOCK(inp); 549 return 0; 550 } 551 552 static int 553 div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 554 struct mbuf *control, struct thread *td) 555 { 556 INIT_VNET_INET(so->so_vnet); 557 558 /* Packet must have a header (but that's about it) */ 559 if (m->m_len < sizeof (struct ip) && 560 (m = m_pullup(m, sizeof (struct ip))) == 0) { 561 V_ipstat.ips_toosmall++; 562 m_freem(m); 563 return EINVAL; 564 } 565 566 /* Send packet */ 567 return div_output(so, m, (struct sockaddr_in *)nam, control); 568 } 569 570 void 571 div_ctlinput(int cmd, struct sockaddr *sa, void *vip) 572 { 573 struct in_addr faddr; 574 575 faddr = ((struct sockaddr_in *)sa)->sin_addr; 576 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 577 return; 578 if (PRC_IS_REDIRECT(cmd)) 579 return; 580 } 581 582 static int 583 div_pcblist(SYSCTL_HANDLER_ARGS) 584 { 585 INIT_VNET_INET(curvnet); 586 int error, i, n; 587 struct inpcb *inp, **inp_list; 588 inp_gen_t gencnt; 589 struct xinpgen xig; 590 591 /* 592 * The process of preparing the TCB list is too time-consuming and 593 * resource-intensive to repeat twice on every request. 594 */ 595 if (req->oldptr == 0) { 596 n = V_divcbinfo.ipi_count; 597 req->oldidx = 2 * (sizeof xig) 598 + (n + n/8) * sizeof(struct xinpcb); 599 return 0; 600 } 601 602 if (req->newptr != 0) 603 return EPERM; 604 605 /* 606 * OK, now we're committed to doing something. 607 */ 608 INP_INFO_RLOCK(&V_divcbinfo); 609 gencnt = V_divcbinfo.ipi_gencnt; 610 n = V_divcbinfo.ipi_count; 611 INP_INFO_RUNLOCK(&V_divcbinfo); 612 613 error = sysctl_wire_old_buffer(req, 614 2 * sizeof(xig) + n*sizeof(struct xinpcb)); 615 if (error != 0) 616 return (error); 617 618 xig.xig_len = sizeof xig; 619 xig.xig_count = n; 620 xig.xig_gen = gencnt; 621 xig.xig_sogen = so_gencnt; 622 error = SYSCTL_OUT(req, &xig, sizeof xig); 623 if (error) 624 return error; 625 626 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 627 if (inp_list == 0) 628 return ENOMEM; 629 630 INP_INFO_RLOCK(&V_divcbinfo); 631 for (inp = LIST_FIRST(V_divcbinfo.ipi_listhead), i = 0; inp && i < n; 632 inp = LIST_NEXT(inp, inp_list)) { 633 INP_RLOCK(inp); 634 if (inp->inp_gencnt <= gencnt && 635 cr_canseeinpcb(req->td->td_ucred, inp) == 0) 636 inp_list[i++] = inp; 637 INP_RUNLOCK(inp); 638 } 639 INP_INFO_RUNLOCK(&V_divcbinfo); 640 n = i; 641 642 error = 0; 643 for (i = 0; i < n; i++) { 644 inp = inp_list[i]; 645 INP_RLOCK(inp); 646 if (inp->inp_gencnt <= gencnt) { 647 struct xinpcb xi; 648 bzero(&xi, sizeof(xi)); 649 xi.xi_len = sizeof xi; 650 /* XXX should avoid extra copy */ 651 bcopy(inp, &xi.xi_inp, sizeof *inp); 652 if (inp->inp_socket) 653 sotoxsocket(inp->inp_socket, &xi.xi_socket); 654 INP_RUNLOCK(inp); 655 error = SYSCTL_OUT(req, &xi, sizeof xi); 656 } else 657 INP_RUNLOCK(inp); 658 } 659 if (!error) { 660 /* 661 * Give the user an updated idea of our state. 662 * If the generation differs from what we told 663 * her before, she knows that something happened 664 * while we were processing this request, and it 665 * might be necessary to retry. 666 */ 667 INP_INFO_RLOCK(&V_divcbinfo); 668 xig.xig_gen = V_divcbinfo.ipi_gencnt; 669 xig.xig_sogen = so_gencnt; 670 xig.xig_count = V_divcbinfo.ipi_count; 671 INP_INFO_RUNLOCK(&V_divcbinfo); 672 error = SYSCTL_OUT(req, &xig, sizeof xig); 673 } 674 free(inp_list, M_TEMP); 675 return error; 676 } 677 678 #ifdef SYSCTL_NODE 679 SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT"); 680 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0, 681 div_pcblist, "S,xinpcb", "List of active divert sockets"); 682 #endif 683 684 struct pr_usrreqs div_usrreqs = { 685 .pru_attach = div_attach, 686 .pru_bind = div_bind, 687 .pru_control = in_control, 688 .pru_detach = div_detach, 689 .pru_peeraddr = in_getpeeraddr, 690 .pru_send = div_send, 691 .pru_shutdown = div_shutdown, 692 .pru_sockaddr = in_getsockaddr, 693 .pru_sosetlabel = in_pcbsosetlabel 694 }; 695 696 struct protosw div_protosw = { 697 .pr_type = SOCK_RAW, 698 .pr_protocol = IPPROTO_DIVERT, 699 .pr_flags = PR_ATOMIC|PR_ADDR, 700 .pr_input = div_input, 701 .pr_ctlinput = div_ctlinput, 702 .pr_ctloutput = ip_ctloutput, 703 .pr_init = div_init, 704 .pr_usrreqs = &div_usrreqs 705 }; 706 707 static int 708 div_modevent(module_t mod, int type, void *unused) 709 { 710 int err = 0; 711 int n; 712 713 switch (type) { 714 case MOD_LOAD: 715 /* 716 * Protocol will be initialized by pf_proto_register(). 717 * We don't have to register ip_protox because we are not 718 * a true IP protocol that goes over the wire. 719 */ 720 err = pf_proto_register(PF_INET, &div_protosw); 721 ip_divert_ptr = divert_packet; 722 break; 723 case MOD_QUIESCE: 724 /* 725 * IPDIVERT may normally not be unloaded because of the 726 * potential race conditions. Tell kldunload we can't be 727 * unloaded unless the unload is forced. 728 */ 729 err = EPERM; 730 break; 731 case MOD_UNLOAD: 732 /* 733 * Forced unload. 734 * 735 * Module ipdivert can only be unloaded if no sockets are 736 * connected. Maybe this can be changed later to forcefully 737 * disconnect any open sockets. 738 * 739 * XXXRW: Note that there is a slight race here, as a new 740 * socket open request could be spinning on the lock and then 741 * we destroy the lock. 742 */ 743 INP_INFO_WLOCK(&V_divcbinfo); 744 n = V_divcbinfo.ipi_count; 745 if (n != 0) { 746 err = EBUSY; 747 INP_INFO_WUNLOCK(&V_divcbinfo); 748 break; 749 } 750 ip_divert_ptr = NULL; 751 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW); 752 INP_INFO_WUNLOCK(&V_divcbinfo); 753 INP_INFO_LOCK_DESTROY(&V_divcbinfo); 754 uma_zdestroy(V_divcbinfo.ipi_zone); 755 break; 756 default: 757 err = EOPNOTSUPP; 758 break; 759 } 760 return err; 761 } 762 763 static moduledata_t ipdivertmod = { 764 "ipdivert", 765 div_modevent, 766 0 767 }; 768 769 DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); 770 MODULE_DEPEND(dummynet, ipfw, 2, 2, 2); 771 MODULE_VERSION(ipdivert, 1); 772