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sys/netinet/ip_divert.c
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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: releng/8.0/sys/netinet/ip_divert.c 196621 2009-08-28 19:10:58Z zec $"); 32 33 #if !defined(KLD_MODULE) 34 #include "opt_inet.h" 35 #include "opt_ipfw.h" 36 #include "opt_sctp.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/rwlock.h> 56 #include <sys/signalvar.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sx.h> 60 #include <sys/sysctl.h> 61 #include <sys/systm.h> 62 63 #include <vm/uma.h> 64 65 #include <net/if.h> 66 #include <net/netisr.h> 67 #include <net/route.h> 68 #include <net/vnet.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_pcb.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/in_var.h> 74 #include <netinet/ip.h> 75 #include <netinet/ip_divert.h> 76 #include <netinet/ip_var.h> 77 #include <netinet/ip_fw.h> 78 #ifdef SCTP 79 #include <netinet/sctp_crc32.h> 80 #endif 81 82 #include <security/mac/mac_framework.h> 83 84 /* 85 * Divert sockets 86 */ 87 88 /* 89 * Allocate enough space to hold a full IP packet 90 */ 91 #define DIVSNDQ (65536 + 100) 92 #define DIVRCVQ (65536 + 100) 93 94 /* 95 * Divert sockets work in conjunction with ipfw, see the divert(4) 96 * manpage for features. 97 * Internally, packets selected by ipfw in ip_input() or ip_output(), 98 * and never diverted before, are passed to the input queue of the 99 * divert socket with a given 'divert_port' number (as specified in 100 * the matching ipfw rule), and they are tagged with a 16 bit cookie 101 * (representing the rule number of the matching ipfw rule), which 102 * is passed to process reading from the socket. 103 * 104 * Packets written to the divert socket are again tagged with a cookie 105 * (usually the same as above) and a destination address. 106 * If the destination address is INADDR_ANY then the packet is 107 * treated as outgoing and sent to ip_output(), otherwise it is 108 * treated as incoming and sent to ip_input(). 109 * In both cases, the packet is tagged with the cookie. 110 * 111 * On reinjection, processing in ip_input() and ip_output() 112 * will be exactly the same as for the original packet, except that 113 * ipfw processing will start at the rule number after the one 114 * written in the cookie (so, tagging a packet with a cookie of 0 115 * will cause it to be effectively considered as a standard packet). 116 */ 117 118 /* Internal variables. */ 119 static VNET_DEFINE(struct inpcbhead, divcb); 120 static VNET_DEFINE(struct inpcbinfo, divcbinfo); 121 122 #define V_divcb VNET(divcb) 123 #define V_divcbinfo VNET(divcbinfo) 124 125 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 126 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 127 128 static eventhandler_tag ip_divert_event_tag; 129 130 /* 131 * Initialize divert connection block queue. 132 */ 133 static void 134 div_zone_change(void *tag) 135 { 136 137 uma_zone_set_max(V_divcbinfo.ipi_zone, maxsockets); 138 } 139 140 static int 141 div_inpcb_init(void *mem, int size, int flags) 142 { 143 struct inpcb *inp = mem; 144 145 INP_LOCK_INIT(inp, "inp", "divinp"); 146 return (0); 147 } 148 149 static void 150 div_inpcb_fini(void *mem, int size) 151 { 152 struct inpcb *inp = mem; 153 154 INP_LOCK_DESTROY(inp); 155 } 156 157 static void 158 div_init(void) 159 { 160 161 INP_INFO_LOCK_INIT(&V_divcbinfo, "div"); 162 LIST_INIT(&V_divcb); 163 V_divcbinfo.ipi_listhead = &V_divcb; 164 #ifdef VIMAGE 165 V_divcbinfo.ipi_vnet = curvnet; 166 #endif 167 /* 168 * XXX We don't use the hash list for divert IP, but it's easier 169 * to allocate a one entry hash list than it is to check all 170 * over the place for hashbase == NULL. 171 */ 172 V_divcbinfo.ipi_hashbase = hashinit(1, M_PCB, &V_divcbinfo.ipi_hashmask); 173 V_divcbinfo.ipi_porthashbase = hashinit(1, M_PCB, 174 &V_divcbinfo.ipi_porthashmask); 175 V_divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb), 176 NULL, NULL, div_inpcb_init, div_inpcb_fini, UMA_ALIGN_PTR, 177 UMA_ZONE_NOFREE); 178 uma_zone_set_max(V_divcbinfo.ipi_zone, maxsockets); 179 } 180 181 static void 182 div_destroy(void) 183 { 184 185 INP_INFO_LOCK_DESTROY(&V_divcbinfo); 186 uma_zdestroy(V_divcbinfo.ipi_zone); 187 hashdestroy(V_divcbinfo.ipi_hashbase, M_PCB, V_divcbinfo.ipi_hashmask); 188 hashdestroy(V_divcbinfo.ipi_porthashbase, M_PCB, 189 V_divcbinfo.ipi_porthashmask); 190 } 191 192 /* 193 * IPPROTO_DIVERT is not in the real IP protocol number space; this 194 * function should never be called. Just in case, drop any packets. 195 */ 196 void 197 div_input(struct mbuf *m, int off) 198 { 199 200 KMOD_IPSTAT_INC(ips_noproto); 201 m_freem(m); 202 } 203 204 /* 205 * Divert a packet by passing it up to the divert socket at port 'port'. 206 * 207 * Setup generic address and protocol structures for div_input routine, 208 * then pass them along with mbuf chain. 209 */ 210 static void 211 divert_packet(struct mbuf *m, int incoming) 212 { 213 struct ip *ip; 214 struct inpcb *inp; 215 struct socket *sa; 216 u_int16_t nport; 217 struct sockaddr_in divsrc; 218 struct m_tag *mtag; 219 220 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL); 221 if (mtag == NULL) { 222 printf("%s: no divert tag\n", __func__); 223 m_freem(m); 224 return; 225 } 226 /* Assure header */ 227 if (m->m_len < sizeof(struct ip) && 228 (m = m_pullup(m, sizeof(struct ip))) == 0) 229 return; 230 ip = mtod(m, struct ip *); 231 232 /* Delayed checksums are currently not compatible with divert. */ 233 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 234 ip->ip_len = ntohs(ip->ip_len); 235 in_delayed_cksum(m); 236 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 237 ip->ip_len = htons(ip->ip_len); 238 } 239 #ifdef SCTP 240 if (m->m_pkthdr.csum_flags & CSUM_SCTP) { 241 ip->ip_len = ntohs(ip->ip_len); 242 sctp_delayed_cksum(m); 243 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 244 ip->ip_len = htons(ip->ip_len); 245 } 246 #endif 247 /* 248 * Record receive interface address, if any. 249 * But only for incoming packets. 250 */ 251 bzero(&divsrc, sizeof(divsrc)); 252 divsrc.sin_len = sizeof(divsrc); 253 divsrc.sin_family = AF_INET; 254 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */ 255 if (incoming) { 256 struct ifaddr *ifa; 257 struct ifnet *ifp; 258 259 /* Sanity check */ 260 M_ASSERTPKTHDR(m); 261 262 /* Find IP address for receive interface */ 263 ifp = m->m_pkthdr.rcvif; 264 if_addr_rlock(ifp); 265 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 266 if (ifa->ifa_addr->sa_family != AF_INET) 267 continue; 268 divsrc.sin_addr = 269 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 270 break; 271 } 272 if_addr_runlock(ifp); 273 } 274 /* 275 * Record the incoming interface name whenever we have one. 276 */ 277 if (m->m_pkthdr.rcvif) { 278 /* 279 * Hide the actual interface name in there in the 280 * sin_zero array. XXX This needs to be moved to a 281 * different sockaddr type for divert, e.g. 282 * sockaddr_div with multiple fields like 283 * sockaddr_dl. Presently we have only 7 bytes 284 * but that will do for now as most interfaces 285 * are 4 or less + 2 or less bytes for unit. 286 * There is probably a faster way of doing this, 287 * possibly taking it from the sockaddr_dl on the iface. 288 * This solves the problem of a P2P link and a LAN interface 289 * having the same address, which can result in the wrong 290 * interface being assigned to the packet when fed back 291 * into the divert socket. Theoretically if the daemon saves 292 * and re-uses the sockaddr_in as suggested in the man pages, 293 * this iface name will come along for the ride. 294 * (see div_output for the other half of this.) 295 */ 296 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname, 297 sizeof(divsrc.sin_zero)); 298 } 299 300 /* Put packet on socket queue, if any */ 301 sa = NULL; 302 nport = htons((u_int16_t)divert_info(mtag)); 303 INP_INFO_RLOCK(&V_divcbinfo); 304 LIST_FOREACH(inp, &V_divcb, inp_list) { 305 /* XXX why does only one socket match? */ 306 if (inp->inp_lport == nport) { 307 INP_RLOCK(inp); 308 sa = inp->inp_socket; 309 SOCKBUF_LOCK(&sa->so_rcv); 310 if (sbappendaddr_locked(&sa->so_rcv, 311 (struct sockaddr *)&divsrc, m, 312 (struct mbuf *)0) == 0) { 313 SOCKBUF_UNLOCK(&sa->so_rcv); 314 sa = NULL; /* force mbuf reclaim below */ 315 } else 316 sorwakeup_locked(sa); 317 INP_RUNLOCK(inp); 318 break; 319 } 320 } 321 INP_INFO_RUNLOCK(&V_divcbinfo); 322 if (sa == NULL) { 323 m_freem(m); 324 KMOD_IPSTAT_INC(ips_noproto); 325 KMOD_IPSTAT_DEC(ips_delivered); 326 } 327 } 328 329 /* 330 * Deliver packet back into the IP processing machinery. 331 * 332 * If no address specified, or address is 0.0.0.0, send to ip_output(); 333 * otherwise, send to ip_input() and mark as having been received on 334 * the interface with that address. 335 */ 336 static int 337 div_output(struct socket *so, struct mbuf *m, struct sockaddr_in *sin, 338 struct mbuf *control) 339 { 340 struct m_tag *mtag; 341 struct divert_tag *dt; 342 int error = 0; 343 struct mbuf *options; 344 345 /* 346 * An mbuf may hasn't come from userland, but we pretend 347 * that it has. 348 */ 349 m->m_pkthdr.rcvif = NULL; 350 m->m_nextpkt = NULL; 351 M_SETFIB(m, so->so_fibnum); 352 353 if (control) 354 m_freem(control); /* XXX */ 355 356 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) { 357 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag), 358 M_NOWAIT | M_ZERO); 359 if (mtag == NULL) { 360 error = ENOBUFS; 361 goto cantsend; 362 } 363 dt = (struct divert_tag *)(mtag+1); 364 m_tag_prepend(m, mtag); 365 } else 366 dt = (struct divert_tag *)(mtag+1); 367 368 /* Loopback avoidance and state recovery */ 369 if (sin) { 370 int i; 371 372 dt->cookie = sin->sin_port; 373 /* 374 * Find receive interface with the given name, stuffed 375 * (if it exists) in the sin_zero[] field. 376 * The name is user supplied data so don't trust its size 377 * or that it is zero terminated. 378 */ 379 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 380 ; 381 if ( i > 0 && i < sizeof(sin->sin_zero)) 382 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 383 } 384 385 /* Reinject packet into the system as incoming or outgoing */ 386 if (!sin || sin->sin_addr.s_addr == 0) { 387 struct ip *const ip = mtod(m, struct ip *); 388 struct inpcb *inp; 389 390 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG; 391 INP_INFO_WLOCK(&V_divcbinfo); 392 inp = sotoinpcb(so); 393 INP_RLOCK(inp); 394 /* 395 * Don't allow both user specified and setsockopt options, 396 * and don't allow packet length sizes that will crash 397 */ 398 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) || 399 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 400 error = EINVAL; 401 INP_RUNLOCK(inp); 402 INP_INFO_WUNLOCK(&V_divcbinfo); 403 m_freem(m); 404 } else { 405 /* Convert fields to host order for ip_output() */ 406 ip->ip_len = ntohs(ip->ip_len); 407 ip->ip_off = ntohs(ip->ip_off); 408 409 /* Send packet to output processing */ 410 KMOD_IPSTAT_INC(ips_rawout); /* XXX */ 411 412 #ifdef MAC 413 mac_inpcb_create_mbuf(inp, m); 414 #endif 415 /* 416 * Get ready to inject the packet into ip_output(). 417 * Just in case socket options were specified on the 418 * divert socket, we duplicate them. This is done 419 * to avoid having to hold the PCB locks over the call 420 * to ip_output(), as doing this results in a number of 421 * lock ordering complexities. 422 * 423 * Note that we set the multicast options argument for 424 * ip_output() to NULL since it should be invariant that 425 * they are not present. 426 */ 427 KASSERT(inp->inp_moptions == NULL, 428 ("multicast options set on a divert socket")); 429 options = NULL; 430 /* 431 * XXXCSJP: It is unclear to me whether or not it makes 432 * sense for divert sockets to have options. However, 433 * for now we will duplicate them with the INP locks 434 * held so we can use them in ip_output() without 435 * requring a reference to the pcb. 436 */ 437 if (inp->inp_options != NULL) { 438 options = m_dup(inp->inp_options, M_DONTWAIT); 439 if (options == NULL) 440 error = ENOBUFS; 441 } 442 INP_RUNLOCK(inp); 443 INP_INFO_WUNLOCK(&V_divcbinfo); 444 if (error == ENOBUFS) { 445 m_freem(m); 446 return (error); 447 } 448 error = ip_output(m, options, NULL, 449 ((so->so_options & SO_DONTROUTE) ? 450 IP_ROUTETOIF : 0) | IP_ALLOWBROADCAST | 451 IP_RAWOUTPUT, NULL, NULL); 452 if (options != NULL) 453 m_freem(options); 454 } 455 } else { 456 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG; 457 if (m->m_pkthdr.rcvif == NULL) { 458 /* 459 * No luck with the name, check by IP address. 460 * Clear the port and the ifname to make sure 461 * there are no distractions for ifa_ifwithaddr. 462 */ 463 struct ifaddr *ifa; 464 465 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 466 sin->sin_port = 0; 467 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 468 if (ifa == NULL) { 469 error = EADDRNOTAVAIL; 470 goto cantsend; 471 } 472 m->m_pkthdr.rcvif = ifa->ifa_ifp; 473 ifa_free(ifa); 474 } 475 #ifdef MAC 476 mac_socket_create_mbuf(so, m); 477 #endif 478 /* Send packet to input processing via netisr */ 479 netisr_queue_src(NETISR_IP, (uintptr_t)so, m); 480 } 481 482 return error; 483 484 cantsend: 485 m_freem(m); 486 return error; 487 } 488 489 static int 490 div_attach(struct socket *so, int proto, struct thread *td) 491 { 492 struct inpcb *inp; 493 int error; 494 495 inp = sotoinpcb(so); 496 KASSERT(inp == NULL, ("div_attach: inp != NULL")); 497 if (td != NULL) { 498 error = priv_check(td, PRIV_NETINET_DIVERT); 499 if (error) 500 return (error); 501 } 502 error = soreserve(so, div_sendspace, div_recvspace); 503 if (error) 504 return error; 505 INP_INFO_WLOCK(&V_divcbinfo); 506 error = in_pcballoc(so, &V_divcbinfo); 507 if (error) { 508 INP_INFO_WUNLOCK(&V_divcbinfo); 509 return error; 510 } 511 inp = (struct inpcb *)so->so_pcb; 512 INP_INFO_WUNLOCK(&V_divcbinfo); 513 inp->inp_ip_p = proto; 514 inp->inp_vflag |= INP_IPV4; 515 inp->inp_flags |= INP_HDRINCL; 516 INP_WUNLOCK(inp); 517 return 0; 518 } 519 520 static void 521 div_detach(struct socket *so) 522 { 523 struct inpcb *inp; 524 525 inp = sotoinpcb(so); 526 KASSERT(inp != NULL, ("div_detach: inp == NULL")); 527 INP_INFO_WLOCK(&V_divcbinfo); 528 INP_WLOCK(inp); 529 in_pcbdetach(inp); 530 in_pcbfree(inp); 531 INP_INFO_WUNLOCK(&V_divcbinfo); 532 } 533 534 static int 535 div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 536 { 537 struct inpcb *inp; 538 int error; 539 540 inp = sotoinpcb(so); 541 KASSERT(inp != NULL, ("div_bind: inp == NULL")); 542 /* in_pcbbind assumes that nam is a sockaddr_in 543 * and in_pcbbind requires a valid address. Since divert 544 * sockets don't we need to make sure the address is 545 * filled in properly. 546 * XXX -- divert should not be abusing in_pcbind 547 * and should probably have its own family. 548 */ 549 if (nam->sa_family != AF_INET) 550 return EAFNOSUPPORT; 551 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 552 INP_INFO_WLOCK(&V_divcbinfo); 553 INP_WLOCK(inp); 554 error = in_pcbbind(inp, nam, td->td_ucred); 555 INP_WUNLOCK(inp); 556 INP_INFO_WUNLOCK(&V_divcbinfo); 557 return error; 558 } 559 560 static int 561 div_shutdown(struct socket *so) 562 { 563 struct inpcb *inp; 564 565 inp = sotoinpcb(so); 566 KASSERT(inp != NULL, ("div_shutdown: inp == NULL")); 567 INP_WLOCK(inp); 568 socantsendmore(so); 569 INP_WUNLOCK(inp); 570 return 0; 571 } 572 573 static int 574 div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 575 struct mbuf *control, struct thread *td) 576 { 577 578 /* Packet must have a header (but that's about it) */ 579 if (m->m_len < sizeof (struct ip) && 580 (m = m_pullup(m, sizeof (struct ip))) == 0) { 581 KMOD_IPSTAT_INC(ips_toosmall); 582 m_freem(m); 583 return EINVAL; 584 } 585 586 /* Send packet */ 587 return div_output(so, m, (struct sockaddr_in *)nam, control); 588 } 589 590 void 591 div_ctlinput(int cmd, struct sockaddr *sa, void *vip) 592 { 593 struct in_addr faddr; 594 595 faddr = ((struct sockaddr_in *)sa)->sin_addr; 596 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 597 return; 598 if (PRC_IS_REDIRECT(cmd)) 599 return; 600 } 601 602 static int 603 div_pcblist(SYSCTL_HANDLER_ARGS) 604 { 605 int error, i, n; 606 struct inpcb *inp, **inp_list; 607 inp_gen_t gencnt; 608 struct xinpgen xig; 609 610 /* 611 * The process of preparing the TCB list is too time-consuming and 612 * resource-intensive to repeat twice on every request. 613 */ 614 if (req->oldptr == 0) { 615 n = V_divcbinfo.ipi_count; 616 req->oldidx = 2 * (sizeof xig) 617 + (n + n/8) * sizeof(struct xinpcb); 618 return 0; 619 } 620 621 if (req->newptr != 0) 622 return EPERM; 623 624 /* 625 * OK, now we're committed to doing something. 626 */ 627 INP_INFO_RLOCK(&V_divcbinfo); 628 gencnt = V_divcbinfo.ipi_gencnt; 629 n = V_divcbinfo.ipi_count; 630 INP_INFO_RUNLOCK(&V_divcbinfo); 631 632 error = sysctl_wire_old_buffer(req, 633 2 * sizeof(xig) + n*sizeof(struct xinpcb)); 634 if (error != 0) 635 return (error); 636 637 xig.xig_len = sizeof xig; 638 xig.xig_count = n; 639 xig.xig_gen = gencnt; 640 xig.xig_sogen = so_gencnt; 641 error = SYSCTL_OUT(req, &xig, sizeof xig); 642 if (error) 643 return error; 644 645 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 646 if (inp_list == 0) 647 return ENOMEM; 648 649 INP_INFO_RLOCK(&V_divcbinfo); 650 for (inp = LIST_FIRST(V_divcbinfo.ipi_listhead), i = 0; inp && i < n; 651 inp = LIST_NEXT(inp, inp_list)) { 652 INP_RLOCK(inp); 653 if (inp->inp_gencnt <= gencnt && 654 cr_canseeinpcb(req->td->td_ucred, inp) == 0) 655 inp_list[i++] = inp; 656 INP_RUNLOCK(inp); 657 } 658 INP_INFO_RUNLOCK(&V_divcbinfo); 659 n = i; 660 661 error = 0; 662 for (i = 0; i < n; i++) { 663 inp = inp_list[i]; 664 INP_RLOCK(inp); 665 if (inp->inp_gencnt <= gencnt) { 666 struct xinpcb xi; 667 bzero(&xi, sizeof(xi)); 668 xi.xi_len = sizeof xi; 669 /* XXX should avoid extra copy */ 670 bcopy(inp, &xi.xi_inp, sizeof *inp); 671 if (inp->inp_socket) 672 sotoxsocket(inp->inp_socket, &xi.xi_socket); 673 INP_RUNLOCK(inp); 674 error = SYSCTL_OUT(req, &xi, sizeof xi); 675 } else 676 INP_RUNLOCK(inp); 677 } 678 if (!error) { 679 /* 680 * Give the user an updated idea of our state. 681 * If the generation differs from what we told 682 * her before, she knows that something happened 683 * while we were processing this request, and it 684 * might be necessary to retry. 685 */ 686 INP_INFO_RLOCK(&V_divcbinfo); 687 xig.xig_gen = V_divcbinfo.ipi_gencnt; 688 xig.xig_sogen = so_gencnt; 689 xig.xig_count = V_divcbinfo.ipi_count; 690 INP_INFO_RUNLOCK(&V_divcbinfo); 691 error = SYSCTL_OUT(req, &xig, sizeof xig); 692 } 693 free(inp_list, M_TEMP); 694 return error; 695 } 696 697 #ifdef SYSCTL_NODE 698 SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT"); 699 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0, 700 div_pcblist, "S,xinpcb", "List of active divert sockets"); 701 #endif 702 703 struct pr_usrreqs div_usrreqs = { 704 .pru_attach = div_attach, 705 .pru_bind = div_bind, 706 .pru_control = in_control, 707 .pru_detach = div_detach, 708 .pru_peeraddr = in_getpeeraddr, 709 .pru_send = div_send, 710 .pru_shutdown = div_shutdown, 711 .pru_sockaddr = in_getsockaddr, 712 .pru_sosetlabel = in_pcbsosetlabel 713 }; 714 715 struct protosw div_protosw = { 716 .pr_type = SOCK_RAW, 717 .pr_protocol = IPPROTO_DIVERT, 718 .pr_flags = PR_ATOMIC|PR_ADDR, 719 .pr_input = div_input, 720 .pr_ctlinput = div_ctlinput, 721 .pr_ctloutput = ip_ctloutput, 722 .pr_init = div_init, 723 #ifdef VIMAGE 724 .pr_destroy = div_destroy, 725 #endif 726 .pr_usrreqs = &div_usrreqs 727 }; 728 729 static int 730 div_modevent(module_t mod, int type, void *unused) 731 { 732 int err = 0; 733 #ifndef VIMAGE 734 int n; 735 #endif 736 737 switch (type) { 738 case MOD_LOAD: 739 /* 740 * Protocol will be initialized by pf_proto_register(). 741 * We don't have to register ip_protox because we are not 742 * a true IP protocol that goes over the wire. 743 */ 744 err = pf_proto_register(PF_INET, &div_protosw); 745 if (err != 0) 746 return (err); 747 ip_divert_ptr = divert_packet; 748 ip_divert_event_tag = EVENTHANDLER_REGISTER(maxsockets_change, 749 div_zone_change, NULL, EVENTHANDLER_PRI_ANY); 750 break; 751 case MOD_QUIESCE: 752 /* 753 * IPDIVERT may normally not be unloaded because of the 754 * potential race conditions. Tell kldunload we can't be 755 * unloaded unless the unload is forced. 756 */ 757 err = EPERM; 758 break; 759 case MOD_UNLOAD: 760 #ifdef VIMAGE 761 err = EPERM; 762 break; 763 #else 764 /* 765 * Forced unload. 766 * 767 * Module ipdivert can only be unloaded if no sockets are 768 * connected. Maybe this can be changed later to forcefully 769 * disconnect any open sockets. 770 * 771 * XXXRW: Note that there is a slight race here, as a new 772 * socket open request could be spinning on the lock and then 773 * we destroy the lock. 774 */ 775 INP_INFO_WLOCK(&V_divcbinfo); 776 n = V_divcbinfo.ipi_count; 777 if (n != 0) { 778 err = EBUSY; 779 INP_INFO_WUNLOCK(&V_divcbinfo); 780 break; 781 } 782 ip_divert_ptr = NULL; 783 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW); 784 INP_INFO_WUNLOCK(&V_divcbinfo); 785 div_destroy(); 786 EVENTHANDLER_DEREGISTER(maxsockets_change, ip_divert_event_tag); 787 break; 788 #endif /* !VIMAGE */ 789 default: 790 err = EOPNOTSUPP; 791 break; 792 } 793 return err; 794 } 795 796 static moduledata_t ipdivertmod = { 797 "ipdivert", 798 div_modevent, 799 0 800 }; 801 802 DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); 803 MODULE_DEPEND(dummynet, ipfw, 2, 2, 2); 804 MODULE_VERSION(ipdivert, 1);
Cache object: e79d2e1a34f9105777c457de6810219d
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