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 #include "opt_sctp.h" 38 #ifndef INET 39 #error "IPDIVERT requires INET." 40 #endif 41 #ifndef IPFIREWALL 42 #error "IPDIVERT requires IPFIREWALL" 43 #endif 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/lock.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/module.h> 52 #include <sys/kernel.h> 53 #include <sys/priv.h> 54 #include <sys/proc.h> 55 #include <sys/protosw.h> 56 #include <sys/rwlock.h> 57 #include <sys/signalvar.h> 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/sx.h> 61 #include <sys/sysctl.h> 62 #include <sys/systm.h> 63 #include <sys/vimage.h> 64 65 #include <vm/uma.h> 66 67 #include <net/if.h> 68 #include <net/netisr.h> 69 #include <net/route.h> 70 71 #include <netinet/in.h> 72 #include <netinet/in_pcb.h> 73 #include <netinet/in_systm.h> 74 #include <netinet/in_var.h> 75 #include <netinet/ip.h> 76 #include <netinet/ip_divert.h> 77 #include <netinet/ip_var.h> 78 #include <netinet/ip_fw.h> 79 #include <netinet/vinet.h> 80 #ifdef SCTP 81 #include <netinet/sctp_crc32.h> 82 #endif 83 84 #include <security/mac/mac_framework.h> 85 86 /* 87 * Divert sockets 88 */ 89 90 /* 91 * Allocate enough space to hold a full IP packet 92 */ 93 #define DIVSNDQ (65536 + 100) 94 #define DIVRCVQ (65536 + 100) 95 96 /* 97 * Divert sockets work in conjunction with ipfw, see the divert(4) 98 * manpage for features. 99 * Internally, packets selected by ipfw in ip_input() or ip_output(), 100 * and never diverted before, are passed to the input queue of the 101 * divert socket with a given 'divert_port' number (as specified in 102 * the matching ipfw rule), and they are tagged with a 16 bit cookie 103 * (representing the rule number of the matching ipfw rule), which 104 * is passed to process reading from the socket. 105 * 106 * Packets written to the divert socket are again tagged with a cookie 107 * (usually the same as above) and a destination address. 108 * If the destination address is INADDR_ANY then the packet is 109 * treated as outgoing and sent to ip_output(), otherwise it is 110 * treated as incoming and sent to ip_input(). 111 * In both cases, the packet is tagged with the cookie. 112 * 113 * On reinjection, processing in ip_input() and ip_output() 114 * will be exactly the same as for the original packet, except that 115 * ipfw processing will start at the rule number after the one 116 * written in the cookie (so, tagging a packet with a cookie of 0 117 * will cause it to be effectively considered as a standard packet). 118 */ 119 120 /* Internal variables. */ 121 #ifdef VIMAGE_GLOBALS 122 static struct inpcbhead divcb; 123 static struct inpcbinfo divcbinfo; 124 #endif 125 126 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 127 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 128 129 /* 130 * Initialize divert connection block queue. 131 */ 132 static void 133 div_zone_change(void *tag) 134 { 135 136 uma_zone_set_max(V_divcbinfo.ipi_zone, maxsockets); 137 } 138 139 static int 140 div_inpcb_init(void *mem, int size, int flags) 141 { 142 struct inpcb *inp = mem; 143 144 INP_LOCK_INIT(inp, "inp", "divinp"); 145 return (0); 146 } 147 148 static void 149 div_inpcb_fini(void *mem, int size) 150 { 151 struct inpcb *inp = mem; 152 153 INP_LOCK_DESTROY(inp); 154 } 155 156 void 157 div_init(void) 158 { 159 INIT_VNET_INET(curvnet); 160 161 INP_INFO_LOCK_INIT(&V_divcbinfo, "div"); 162 LIST_INIT(&V_divcb); 163 V_divcbinfo.ipi_listhead = &V_divcb; 164 /* 165 * XXX We don't use the hash list for divert IP, but it's easier 166 * to allocate a one entry hash list than it is to check all 167 * over the place for hashbase == NULL. 168 */ 169 V_divcbinfo.ipi_hashbase = hashinit(1, M_PCB, &V_divcbinfo.ipi_hashmask); 170 V_divcbinfo.ipi_porthashbase = hashinit(1, M_PCB, 171 &V_divcbinfo.ipi_porthashmask); 172 V_divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb), 173 NULL, NULL, div_inpcb_init, div_inpcb_fini, UMA_ALIGN_PTR, 174 UMA_ZONE_NOFREE); 175 uma_zone_set_max(V_divcbinfo.ipi_zone, maxsockets); 176 EVENTHANDLER_REGISTER(maxsockets_change, div_zone_change, 177 NULL, EVENTHANDLER_PRI_ANY); 178 } 179 180 /* 181 * IPPROTO_DIVERT is not in the real IP protocol number space; this 182 * function should never be called. Just in case, drop any packets. 183 */ 184 void 185 div_input(struct mbuf *m, int off) 186 { 187 INIT_VNET_INET(curvnet); 188 189 V_ipstat.ips_noproto++; 190 m_freem(m); 191 } 192 193 /* 194 * Divert a packet by passing it up to the divert socket at port 'port'. 195 * 196 * Setup generic address and protocol structures for div_input routine, 197 * then pass them along with mbuf chain. 198 */ 199 static void 200 divert_packet(struct mbuf *m, int incoming) 201 { 202 INIT_VNET_INET(curvnet); 203 struct ip *ip; 204 struct inpcb *inp; 205 struct socket *sa; 206 u_int16_t nport; 207 struct sockaddr_in divsrc; 208 struct m_tag *mtag; 209 210 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL); 211 if (mtag == NULL) { 212 printf("%s: no divert tag\n", __func__); 213 m_freem(m); 214 return; 215 } 216 /* Assure header */ 217 if (m->m_len < sizeof(struct ip) && 218 (m = m_pullup(m, sizeof(struct ip))) == 0) 219 return; 220 ip = mtod(m, struct ip *); 221 222 /* Delayed checksums are currently not compatible with divert. */ 223 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 224 ip->ip_len = ntohs(ip->ip_len); 225 in_delayed_cksum(m); 226 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 227 ip->ip_len = htons(ip->ip_len); 228 } 229 #ifdef SCTP 230 if (m->m_pkthdr.csum_flags & CSUM_SCTP) { 231 ip->ip_len = ntohs(ip->ip_len); 232 sctp_delayed_cksum(m); 233 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 234 ip->ip_len = htons(ip->ip_len); 235 } 236 #endif 237 /* 238 * Record receive interface address, if any. 239 * But only for incoming packets. 240 */ 241 bzero(&divsrc, sizeof(divsrc)); 242 divsrc.sin_len = sizeof(divsrc); 243 divsrc.sin_family = AF_INET; 244 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */ 245 if (incoming) { 246 struct ifaddr *ifa; 247 248 /* Sanity check */ 249 M_ASSERTPKTHDR(m); 250 251 /* Find IP address for receive interface */ 252 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) { 253 if (ifa->ifa_addr->sa_family != AF_INET) 254 continue; 255 divsrc.sin_addr = 256 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 257 break; 258 } 259 } 260 /* 261 * Record the incoming interface name whenever we have one. 262 */ 263 if (m->m_pkthdr.rcvif) { 264 /* 265 * Hide the actual interface name in there in the 266 * sin_zero array. XXX This needs to be moved to a 267 * different sockaddr type for divert, e.g. 268 * sockaddr_div with multiple fields like 269 * sockaddr_dl. Presently we have only 7 bytes 270 * but that will do for now as most interfaces 271 * are 4 or less + 2 or less bytes for unit. 272 * There is probably a faster way of doing this, 273 * possibly taking it from the sockaddr_dl on the iface. 274 * This solves the problem of a P2P link and a LAN interface 275 * having the same address, which can result in the wrong 276 * interface being assigned to the packet when fed back 277 * into the divert socket. Theoretically if the daemon saves 278 * and re-uses the sockaddr_in as suggested in the man pages, 279 * this iface name will come along for the ride. 280 * (see div_output for the other half of this.) 281 */ 282 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname, 283 sizeof(divsrc.sin_zero)); 284 } 285 286 /* Put packet on socket queue, if any */ 287 sa = NULL; 288 nport = htons((u_int16_t)divert_info(mtag)); 289 INP_INFO_RLOCK(&V_divcbinfo); 290 LIST_FOREACH(inp, &V_divcb, inp_list) { 291 /* XXX why does only one socket match? */ 292 if (inp->inp_lport == nport) { 293 INP_RLOCK(inp); 294 sa = inp->inp_socket; 295 SOCKBUF_LOCK(&sa->so_rcv); 296 if (sbappendaddr_locked(&sa->so_rcv, 297 (struct sockaddr *)&divsrc, m, 298 (struct mbuf *)0) == 0) { 299 SOCKBUF_UNLOCK(&sa->so_rcv); 300 sa = NULL; /* force mbuf reclaim below */ 301 } else 302 sorwakeup_locked(sa); 303 INP_RUNLOCK(inp); 304 break; 305 } 306 } 307 INP_INFO_RUNLOCK(&V_divcbinfo); 308 if (sa == NULL) { 309 m_freem(m); 310 V_ipstat.ips_noproto++; 311 V_ipstat.ips_delivered--; 312 } 313 } 314 315 /* 316 * Deliver packet back into the IP processing machinery. 317 * 318 * If no address specified, or address is 0.0.0.0, send to ip_output(); 319 * otherwise, send to ip_input() and mark as having been received on 320 * the interface with that address. 321 */ 322 static int 323 div_output(struct socket *so, struct mbuf *m, struct sockaddr_in *sin, 324 struct mbuf *control) 325 { 326 INIT_VNET_INET(curvnet); 327 struct m_tag *mtag; 328 struct divert_tag *dt; 329 int error = 0; 330 struct mbuf *options; 331 332 /* 333 * An mbuf may hasn't come from userland, but we pretend 334 * that it has. 335 */ 336 m->m_pkthdr.rcvif = NULL; 337 m->m_nextpkt = NULL; 338 M_SETFIB(m, so->so_fibnum); 339 340 if (control) 341 m_freem(control); /* XXX */ 342 343 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) { 344 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag), 345 M_NOWAIT | M_ZERO); 346 if (mtag == NULL) { 347 error = ENOBUFS; 348 goto cantsend; 349 } 350 dt = (struct divert_tag *)(mtag+1); 351 m_tag_prepend(m, mtag); 352 } else 353 dt = (struct divert_tag *)(mtag+1); 354 355 /* Loopback avoidance and state recovery */ 356 if (sin) { 357 int i; 358 359 dt->cookie = sin->sin_port; 360 /* 361 * Find receive interface with the given name, stuffed 362 * (if it exists) in the sin_zero[] field. 363 * The name is user supplied data so don't trust its size 364 * or that it is zero terminated. 365 */ 366 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 367 ; 368 if ( i > 0 && i < sizeof(sin->sin_zero)) 369 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 370 } 371 372 /* Reinject packet into the system as incoming or outgoing */ 373 if (!sin || sin->sin_addr.s_addr == 0) { 374 struct ip *const ip = mtod(m, struct ip *); 375 struct inpcb *inp; 376 377 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG; 378 INP_INFO_WLOCK(&V_divcbinfo); 379 inp = sotoinpcb(so); 380 INP_RLOCK(inp); 381 /* 382 * Don't allow both user specified and setsockopt options, 383 * and don't allow packet length sizes that will crash 384 */ 385 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) || 386 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 387 error = EINVAL; 388 INP_RUNLOCK(inp); 389 INP_INFO_WUNLOCK(&V_divcbinfo); 390 m_freem(m); 391 } else { 392 /* Convert fields to host order for ip_output() */ 393 ip->ip_len = ntohs(ip->ip_len); 394 ip->ip_off = ntohs(ip->ip_off); 395 396 /* Send packet to output processing */ 397 V_ipstat.ips_rawout++; /* XXX */ 398 399 #ifdef MAC 400 mac_inpcb_create_mbuf(inp, m); 401 #endif 402 /* 403 * Get ready to inject the packet into ip_output(). 404 * Just in case socket options were specified on the 405 * divert socket, we duplicate them. This is done 406 * to avoid having to hold the PCB locks over the call 407 * to ip_output(), as doing this results in a number of 408 * lock ordering complexities. 409 * 410 * Note that we set the multicast options argument for 411 * ip_output() to NULL since it should be invariant that 412 * they are not present. 413 */ 414 KASSERT(inp->inp_moptions == NULL, 415 ("multicast options set on a divert socket")); 416 options = NULL; 417 /* 418 * XXXCSJP: It is unclear to me whether or not it makes 419 * sense for divert sockets to have options. However, 420 * for now we will duplicate them with the INP locks 421 * held so we can use them in ip_output() without 422 * requring a reference to the pcb. 423 */ 424 if (inp->inp_options != NULL) { 425 options = m_dup(inp->inp_options, M_DONTWAIT); 426 if (options == NULL) 427 error = ENOBUFS; 428 } 429 INP_RUNLOCK(inp); 430 INP_INFO_WUNLOCK(&V_divcbinfo); 431 if (error == ENOBUFS) { 432 m_freem(m); 433 return (error); 434 } 435 error = ip_output(m, options, NULL, 436 ((so->so_options & SO_DONTROUTE) ? 437 IP_ROUTETOIF : 0) | IP_ALLOWBROADCAST | 438 IP_RAWOUTPUT, NULL, NULL); 439 if (options != NULL) 440 m_freem(options); 441 } 442 } else { 443 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG; 444 if (m->m_pkthdr.rcvif == NULL) { 445 /* 446 * No luck with the name, check by IP address. 447 * Clear the port and the ifname to make sure 448 * there are no distractions for ifa_ifwithaddr. 449 */ 450 struct ifaddr *ifa; 451 452 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 453 sin->sin_port = 0; 454 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 455 if (ifa == NULL) { 456 error = EADDRNOTAVAIL; 457 goto cantsend; 458 } 459 m->m_pkthdr.rcvif = ifa->ifa_ifp; 460 } 461 #ifdef MAC 462 SOCK_LOCK(so); 463 mac_socket_create_mbuf(so, m); 464 SOCK_UNLOCK(so); 465 #endif 466 /* Send packet to input processing via netisr */ 467 netisr_queue(NETISR_IP, m); 468 } 469 470 return error; 471 472 cantsend: 473 m_freem(m); 474 return error; 475 } 476 477 static int 478 div_attach(struct socket *so, int proto, struct thread *td) 479 { 480 INIT_VNET_INET(so->so_vnet); 481 struct inpcb *inp; 482 int error; 483 484 inp = sotoinpcb(so); 485 KASSERT(inp == NULL, ("div_attach: inp != NULL")); 486 if (td != NULL) { 487 error = priv_check(td, PRIV_NETINET_DIVERT); 488 if (error) 489 return (error); 490 } 491 error = soreserve(so, div_sendspace, div_recvspace); 492 if (error) 493 return error; 494 INP_INFO_WLOCK(&V_divcbinfo); 495 error = in_pcballoc(so, &V_divcbinfo); 496 if (error) { 497 INP_INFO_WUNLOCK(&V_divcbinfo); 498 return error; 499 } 500 inp = (struct inpcb *)so->so_pcb; 501 INP_INFO_WUNLOCK(&V_divcbinfo); 502 inp->inp_ip_p = proto; 503 inp->inp_vflag |= INP_IPV4; 504 inp->inp_flags |= INP_HDRINCL; 505 INP_WUNLOCK(inp); 506 return 0; 507 } 508 509 static void 510 div_detach(struct socket *so) 511 { 512 INIT_VNET_INET(so->so_vnet); 513 struct inpcb *inp; 514 515 inp = sotoinpcb(so); 516 KASSERT(inp != NULL, ("div_detach: inp == NULL")); 517 INP_INFO_WLOCK(&V_divcbinfo); 518 INP_WLOCK(inp); 519 in_pcbdetach(inp); 520 in_pcbfree(inp); 521 INP_INFO_WUNLOCK(&V_divcbinfo); 522 } 523 524 static int 525 div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 526 { 527 INIT_VNET_INET(so->so_vnet); 528 struct inpcb *inp; 529 int error; 530 531 inp = sotoinpcb(so); 532 KASSERT(inp != NULL, ("div_bind: inp == NULL")); 533 /* in_pcbbind assumes that nam is a sockaddr_in 534 * and in_pcbbind requires a valid address. Since divert 535 * sockets don't we need to make sure the address is 536 * filled in properly. 537 * XXX -- divert should not be abusing in_pcbind 538 * and should probably have its own family. 539 */ 540 if (nam->sa_family != AF_INET) 541 return EAFNOSUPPORT; 542 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 543 INP_INFO_WLOCK(&V_divcbinfo); 544 INP_WLOCK(inp); 545 error = in_pcbbind(inp, nam, td->td_ucred); 546 INP_WUNLOCK(inp); 547 INP_INFO_WUNLOCK(&V_divcbinfo); 548 return error; 549 } 550 551 static int 552 div_shutdown(struct socket *so) 553 { 554 struct inpcb *inp; 555 556 inp = sotoinpcb(so); 557 KASSERT(inp != NULL, ("div_shutdown: inp == NULL")); 558 INP_WLOCK(inp); 559 socantsendmore(so); 560 INP_WUNLOCK(inp); 561 return 0; 562 } 563 564 static int 565 div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 566 struct mbuf *control, struct thread *td) 567 { 568 INIT_VNET_INET(so->so_vnet); 569 570 /* Packet must have a header (but that's about it) */ 571 if (m->m_len < sizeof (struct ip) && 572 (m = m_pullup(m, sizeof (struct ip))) == 0) { 573 V_ipstat.ips_toosmall++; 574 m_freem(m); 575 return EINVAL; 576 } 577 578 /* Send packet */ 579 return div_output(so, m, (struct sockaddr_in *)nam, control); 580 } 581 582 void 583 div_ctlinput(int cmd, struct sockaddr *sa, void *vip) 584 { 585 struct in_addr faddr; 586 587 faddr = ((struct sockaddr_in *)sa)->sin_addr; 588 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 589 return; 590 if (PRC_IS_REDIRECT(cmd)) 591 return; 592 } 593 594 static int 595 div_pcblist(SYSCTL_HANDLER_ARGS) 596 { 597 INIT_VNET_INET(curvnet); 598 int error, i, n; 599 struct inpcb *inp, **inp_list; 600 inp_gen_t gencnt; 601 struct xinpgen xig; 602 603 /* 604 * The process of preparing the TCB list is too time-consuming and 605 * resource-intensive to repeat twice on every request. 606 */ 607 if (req->oldptr == 0) { 608 n = V_divcbinfo.ipi_count; 609 req->oldidx = 2 * (sizeof xig) 610 + (n + n/8) * sizeof(struct xinpcb); 611 return 0; 612 } 613 614 if (req->newptr != 0) 615 return EPERM; 616 617 /* 618 * OK, now we're committed to doing something. 619 */ 620 INP_INFO_RLOCK(&V_divcbinfo); 621 gencnt = V_divcbinfo.ipi_gencnt; 622 n = V_divcbinfo.ipi_count; 623 INP_INFO_RUNLOCK(&V_divcbinfo); 624 625 error = sysctl_wire_old_buffer(req, 626 2 * sizeof(xig) + n*sizeof(struct xinpcb)); 627 if (error != 0) 628 return (error); 629 630 xig.xig_len = sizeof xig; 631 xig.xig_count = n; 632 xig.xig_gen = gencnt; 633 xig.xig_sogen = so_gencnt; 634 error = SYSCTL_OUT(req, &xig, sizeof xig); 635 if (error) 636 return error; 637 638 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 639 if (inp_list == 0) 640 return ENOMEM; 641 642 INP_INFO_RLOCK(&V_divcbinfo); 643 for (inp = LIST_FIRST(V_divcbinfo.ipi_listhead), i = 0; inp && i < n; 644 inp = LIST_NEXT(inp, inp_list)) { 645 INP_RLOCK(inp); 646 if (inp->inp_gencnt <= gencnt && 647 cr_canseeinpcb(req->td->td_ucred, inp) == 0) 648 inp_list[i++] = inp; 649 INP_RUNLOCK(inp); 650 } 651 INP_INFO_RUNLOCK(&V_divcbinfo); 652 n = i; 653 654 error = 0; 655 for (i = 0; i < n; i++) { 656 inp = inp_list[i]; 657 INP_RLOCK(inp); 658 if (inp->inp_gencnt <= gencnt) { 659 struct xinpcb xi; 660 bzero(&xi, sizeof(xi)); 661 xi.xi_len = sizeof xi; 662 /* XXX should avoid extra copy */ 663 bcopy(inp, &xi.xi_inp, sizeof *inp); 664 if (inp->inp_socket) 665 sotoxsocket(inp->inp_socket, &xi.xi_socket); 666 INP_RUNLOCK(inp); 667 error = SYSCTL_OUT(req, &xi, sizeof xi); 668 } else 669 INP_RUNLOCK(inp); 670 } 671 if (!error) { 672 /* 673 * Give the user an updated idea of our state. 674 * If the generation differs from what we told 675 * her before, she knows that something happened 676 * while we were processing this request, and it 677 * might be necessary to retry. 678 */ 679 INP_INFO_RLOCK(&V_divcbinfo); 680 xig.xig_gen = V_divcbinfo.ipi_gencnt; 681 xig.xig_sogen = so_gencnt; 682 xig.xig_count = V_divcbinfo.ipi_count; 683 INP_INFO_RUNLOCK(&V_divcbinfo); 684 error = SYSCTL_OUT(req, &xig, sizeof xig); 685 } 686 free(inp_list, M_TEMP); 687 return error; 688 } 689 690 #ifdef SYSCTL_NODE 691 SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT"); 692 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0, 693 div_pcblist, "S,xinpcb", "List of active divert sockets"); 694 #endif 695 696 struct pr_usrreqs div_usrreqs = { 697 .pru_attach = div_attach, 698 .pru_bind = div_bind, 699 .pru_control = in_control, 700 .pru_detach = div_detach, 701 .pru_peeraddr = in_getpeeraddr, 702 .pru_send = div_send, 703 .pru_shutdown = div_shutdown, 704 .pru_sockaddr = in_getsockaddr, 705 .pru_sosetlabel = in_pcbsosetlabel 706 }; 707 708 struct protosw div_protosw = { 709 .pr_type = SOCK_RAW, 710 .pr_protocol = IPPROTO_DIVERT, 711 .pr_flags = PR_ATOMIC|PR_ADDR, 712 .pr_input = div_input, 713 .pr_ctlinput = div_ctlinput, 714 .pr_ctloutput = ip_ctloutput, 715 .pr_init = div_init, 716 .pr_usrreqs = &div_usrreqs 717 }; 718 719 static int 720 div_modevent(module_t mod, int type, void *unused) 721 { 722 int err = 0; 723 int n; 724 725 switch (type) { 726 case MOD_LOAD: 727 /* 728 * Protocol will be initialized by pf_proto_register(). 729 * We don't have to register ip_protox because we are not 730 * a true IP protocol that goes over the wire. 731 */ 732 err = pf_proto_register(PF_INET, &div_protosw); 733 ip_divert_ptr = divert_packet; 734 break; 735 case MOD_QUIESCE: 736 /* 737 * IPDIVERT may normally not be unloaded because of the 738 * potential race conditions. Tell kldunload we can't be 739 * unloaded unless the unload is forced. 740 */ 741 err = EPERM; 742 break; 743 case MOD_UNLOAD: 744 /* 745 * Forced unload. 746 * 747 * Module ipdivert can only be unloaded if no sockets are 748 * connected. Maybe this can be changed later to forcefully 749 * disconnect any open sockets. 750 * 751 * XXXRW: Note that there is a slight race here, as a new 752 * socket open request could be spinning on the lock and then 753 * we destroy the lock. 754 */ 755 INP_INFO_WLOCK(&V_divcbinfo); 756 n = V_divcbinfo.ipi_count; 757 if (n != 0) { 758 err = EBUSY; 759 INP_INFO_WUNLOCK(&V_divcbinfo); 760 break; 761 } 762 ip_divert_ptr = NULL; 763 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW); 764 INP_INFO_WUNLOCK(&V_divcbinfo); 765 INP_INFO_LOCK_DESTROY(&V_divcbinfo); 766 uma_zdestroy(V_divcbinfo.ipi_zone); 767 break; 768 default: 769 err = EOPNOTSUPP; 770 break; 771 } 772 return err; 773 } 774 775 static moduledata_t ipdivertmod = { 776 "ipdivert", 777 div_modevent, 778 0 779 }; 780 781 DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); 782 MODULE_DEPEND(dummynet, ipfw, 2, 2, 2); 783 MODULE_VERSION(ipdivert, 1); 784