1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 #include "opt_sctp.h" 38 39 #include <sys/param.h> 40 #include <sys/eventhandler.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/module.h> 46 #include <sys/kernel.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/domain.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/sysctl.h> 54 #include <net/vnet.h> 55 56 #include <net/if.h> 57 #include <net/if_var.h> 58 #include <net/if_private.h> 59 #include <net/netisr.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_pcb.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/in_var.h> 65 #include <netinet/ip.h> 66 #include <netinet/ip_var.h> 67 #include <netinet/ip_divert.h> 68 #ifdef INET6 69 #include <netinet/ip6.h> 70 #include <netinet6/ip6_var.h> 71 #endif 72 #if defined(SCTP) || defined(SCTP_SUPPORT) 73 #include <netinet/sctp_crc32.h> 74 #endif 75 76 #include <security/mac/mac_framework.h> 77 /* 78 * Divert sockets 79 */ 80 81 /* 82 * Allocate enough space to hold a full IP packet 83 */ 84 #define DIVSNDQ (65536 + 100) 85 #define DIVRCVQ (65536 + 100) 86 87 /* 88 * Usually a system has very few divert ports. Previous implementation 89 * used a linked list. 90 */ 91 #define DIVHASHSIZE (1 << 3) /* 8 entries, one cache line. */ 92 #define DIVHASH(port) (port % DIVHASHSIZE) 93 #define DCBHASH(dcb) ((dcb)->dcb_port % DIVHASHSIZE) 94 95 /* 96 * Divert sockets work in conjunction with ipfw or other packet filters, 97 * see the divert(4) manpage for features. 98 * Packets are selected by the packet filter and tagged with an 99 * MTAG_IPFW_RULE tag carrying the 'divert port' number (as set by 100 * the packet filter) and information on the matching filter rule for 101 * subsequent reinjection. The divert_port is used to put the packet 102 * on the corresponding divert socket, while the rule number is passed 103 * up (at least partially) as the sin_port in the struct sockaddr. 104 * 105 * Packets written to the divert socket carry in sin_addr a 106 * destination address, and in sin_port the number of the filter rule 107 * after which to continue processing. 108 * If the destination address is INADDR_ANY, the packet is treated as 109 * as outgoing and sent to ip_output(); otherwise it is treated as 110 * incoming and sent to ip_input(). 111 * Further, sin_zero carries some information on the interface, 112 * which can be used in the reinject -- see comments in the code. 113 * 114 * On reinjection, processing in ip_input() and ip_output() 115 * will be exactly the same as for the original packet, except that 116 * packet filter processing will start at the rule number after the one 117 * written in the sin_port (ipfw does not allow a rule #0, so sin_port=0 118 * will apply the entire ruleset to the packet). 119 */ 120 static SYSCTL_NODE(_net_inet, OID_AUTO, divert, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 121 "divert(4)"); 122 123 VNET_PCPUSTAT_DEFINE_STATIC(struct divstat, divstat); 124 VNET_PCPUSTAT_SYSINIT(divstat); 125 #ifdef VIMAGE 126 VNET_PCPUSTAT_SYSUNINIT(divstat); 127 #endif 128 SYSCTL_VNET_PCPUSTAT(_net_inet_divert, OID_AUTO, stats, struct divstat, 129 divstat, "divert(4) socket statistics"); 130 #define DIVSTAT_INC(name) \ 131 VNET_PCPUSTAT_ADD(struct divstat, divstat, div_ ## name, 1) 132 133 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 134 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 135 136 static int div_output_inbound(int fmaily, struct socket *so, struct mbuf *m, 137 struct sockaddr_in *sin); 138 static int div_output_outbound(int family, struct socket *so, struct mbuf *m); 139 140 struct divcb { 141 union { 142 SLIST_ENTRY(divcb) dcb_next; 143 intptr_t dcb_bound; 144 #define DCB_UNBOUND ((intptr_t)-1) 145 }; 146 struct socket *dcb_socket; 147 uint16_t dcb_port; 148 uint64_t dcb_gencnt; 149 struct epoch_context dcb_epochctx; 150 }; 151 152 SLIST_HEAD(divhashhead, divcb); 153 154 VNET_DEFINE_STATIC(struct divhashhead, divhash[DIVHASHSIZE]) = {}; 155 #define V_divhash VNET(divhash) 156 VNET_DEFINE_STATIC(uint64_t, dcb_count) = 0; 157 #define V_dcb_count VNET(dcb_count) 158 VNET_DEFINE_STATIC(uint64_t, dcb_gencnt) = 0; 159 #define V_dcb_gencnt VNET(dcb_gencnt) 160 161 static struct mtx divert_mtx; 162 MTX_SYSINIT(divert, &divert_mtx, "divert(4) socket pcb lists", MTX_DEF); 163 #define DIVERT_LOCK() mtx_lock(&divert_mtx) 164 #define DIVERT_UNLOCK() mtx_unlock(&divert_mtx) 165 166 /* 167 * Divert a packet by passing it up to the divert socket at port 'port'. 168 */ 169 static void 170 divert_packet(struct mbuf *m, bool incoming) 171 { 172 struct divcb *dcb; 173 u_int16_t nport; 174 struct sockaddr_in divsrc; 175 struct m_tag *mtag; 176 177 NET_EPOCH_ASSERT(); 178 179 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL); 180 if (mtag == NULL) { 181 m_freem(m); 182 return; 183 } 184 /* Assure header */ 185 if (m->m_len < sizeof(struct ip) && 186 (m = m_pullup(m, sizeof(struct ip))) == NULL) 187 return; 188 #ifdef INET 189 /* Delayed checksums are currently not compatible with divert. */ 190 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 191 in_delayed_cksum(m); 192 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 193 } 194 #if defined(SCTP) || defined(SCTP_SUPPORT) 195 if (m->m_pkthdr.csum_flags & CSUM_SCTP) { 196 struct ip *ip; 197 198 ip = mtod(m, struct ip *); 199 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 200 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 201 } 202 #endif 203 #endif 204 #ifdef INET6 205 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 206 in6_delayed_cksum(m, m->m_pkthdr.len - 207 sizeof(struct ip6_hdr), sizeof(struct ip6_hdr)); 208 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 209 } 210 #if defined(SCTP) || defined(SCTP_SUPPORT) 211 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 212 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 213 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 214 } 215 #endif 216 #endif /* INET6 */ 217 bzero(&divsrc, sizeof(divsrc)); 218 divsrc.sin_len = sizeof(divsrc); 219 divsrc.sin_family = AF_INET; 220 /* record matching rule, in host format */ 221 divsrc.sin_port = ((struct ipfw_rule_ref *)(mtag+1))->rulenum; 222 /* 223 * Record receive interface address, if any. 224 * But only for incoming packets. 225 */ 226 if (incoming) { 227 struct ifaddr *ifa; 228 struct ifnet *ifp; 229 230 /* Sanity check */ 231 M_ASSERTPKTHDR(m); 232 233 /* Find IP address for receive interface */ 234 ifp = m->m_pkthdr.rcvif; 235 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 236 if (ifa->ifa_addr->sa_family != AF_INET) 237 continue; 238 divsrc.sin_addr = 239 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 240 break; 241 } 242 } 243 /* 244 * Record the incoming interface name whenever we have one. 245 */ 246 if (m->m_pkthdr.rcvif) { 247 /* 248 * Hide the actual interface name in there in the 249 * sin_zero array. XXX This needs to be moved to a 250 * different sockaddr type for divert, e.g. 251 * sockaddr_div with multiple fields like 252 * sockaddr_dl. Presently we have only 7 bytes 253 * but that will do for now as most interfaces 254 * are 4 or less + 2 or less bytes for unit. 255 * There is probably a faster way of doing this, 256 * possibly taking it from the sockaddr_dl on the iface. 257 * This solves the problem of a P2P link and a LAN interface 258 * having the same address, which can result in the wrong 259 * interface being assigned to the packet when fed back 260 * into the divert socket. Theoretically if the daemon saves 261 * and re-uses the sockaddr_in as suggested in the man pages, 262 * this iface name will come along for the ride. 263 * (see div_output for the other half of this.) 264 */ 265 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname, 266 sizeof(divsrc.sin_zero)); 267 } 268 269 /* Put packet on socket queue, if any */ 270 nport = htons((uint16_t)(((struct ipfw_rule_ref *)(mtag+1))->info)); 271 SLIST_FOREACH(dcb, &V_divhash[DIVHASH(nport)], dcb_next) 272 if (dcb->dcb_port == nport) 273 break; 274 275 if (dcb != NULL) { 276 struct socket *sa = dcb->dcb_socket; 277 278 SOCKBUF_LOCK(&sa->so_rcv); 279 if (sbappendaddr_locked(&sa->so_rcv, 280 (struct sockaddr *)&divsrc, m, NULL) == 0) { 281 soroverflow_locked(sa); 282 m_freem(m); 283 } else { 284 sorwakeup_locked(sa); 285 DIVSTAT_INC(diverted); 286 } 287 } else { 288 DIVSTAT_INC(noport); 289 m_freem(m); 290 } 291 } 292 293 /* 294 * Deliver packet back into the IP processing machinery. 295 * 296 * If no address specified, or address is 0.0.0.0, send to ip_output(); 297 * otherwise, send to ip_input() and mark as having been received on 298 * the interface with that address. 299 */ 300 static int 301 div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 302 struct mbuf *control, struct thread *td) 303 { 304 struct epoch_tracker et; 305 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 306 const struct ip *ip; 307 struct m_tag *mtag; 308 struct ipfw_rule_ref *dt; 309 int error, family; 310 311 if (control) 312 m_freem(control); 313 314 /* Packet must have a header (but that's about it) */ 315 if (m->m_len < sizeof (struct ip) && 316 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 317 m_freem(m); 318 return (EINVAL); 319 } 320 321 if (sin != NULL) { 322 if (sin->sin_family != AF_INET) { 323 m_freem(m); 324 return (EAFNOSUPPORT); 325 } 326 if (sin->sin_len != sizeof(*sin)) { 327 m_freem(m); 328 return (EINVAL); 329 } 330 } 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 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL); 341 if (mtag == NULL) { 342 /* this should be normal */ 343 mtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 344 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 345 if (mtag == NULL) { 346 m_freem(m); 347 return (ENOBUFS); 348 } 349 m_tag_prepend(m, mtag); 350 } 351 dt = (struct ipfw_rule_ref *)(mtag+1); 352 353 /* Loopback avoidance and state recovery */ 354 if (sin) { 355 int i; 356 357 /* set the starting point. We provide a non-zero slot, 358 * but a non_matching chain_id to skip that info and use 359 * the rulenum/rule_id. 360 */ 361 dt->slot = 1; /* dummy, chain_id is invalid */ 362 dt->chain_id = 0; 363 dt->rulenum = sin->sin_port+1; /* host format ? */ 364 dt->rule_id = 0; 365 /* XXX: broken for IPv6 */ 366 /* 367 * Find receive interface with the given name, stuffed 368 * (if it exists) in the sin_zero[] field. 369 * The name is user supplied data so don't trust its size 370 * or that it is zero terminated. 371 */ 372 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 373 ; 374 if ( i > 0 && i < sizeof(sin->sin_zero)) 375 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 376 } 377 378 ip = mtod(m, struct ip *); 379 switch (ip->ip_v) { 380 #ifdef INET 381 case IPVERSION: 382 family = AF_INET; 383 break; 384 #endif 385 #ifdef INET6 386 case IPV6_VERSION >> 4: 387 family = AF_INET6; 388 break; 389 #endif 390 default: 391 m_freem(m); 392 return (EAFNOSUPPORT); 393 } 394 395 /* Reinject packet into the system as incoming or outgoing */ 396 NET_EPOCH_ENTER(et); 397 if (!sin || sin->sin_addr.s_addr == 0) { 398 dt->info |= IPFW_IS_DIVERT | IPFW_INFO_OUT; 399 error = div_output_outbound(family, so, m); 400 } else { 401 dt->info |= IPFW_IS_DIVERT | IPFW_INFO_IN; 402 error = div_output_inbound(family, so, m, sin); 403 } 404 NET_EPOCH_EXIT(et); 405 406 return (error); 407 } 408 409 /* 410 * Sends mbuf @m to the wire via ip[6]_output(). 411 * 412 * Returns 0 on success or an errno value on failure. @m is always consumed. 413 */ 414 static int 415 div_output_outbound(int family, struct socket *so, struct mbuf *m) 416 { 417 int error; 418 419 switch (family) { 420 #ifdef INET 421 case AF_INET: 422 { 423 struct ip *const ip = mtod(m, struct ip *); 424 425 /* Don't allow packet length sizes that will crash. */ 426 if (((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 427 m_freem(m); 428 return (EINVAL); 429 } 430 break; 431 } 432 #endif 433 #ifdef INET6 434 case AF_INET6: 435 { 436 struct ip6_hdr *const ip6 = mtod(m, struct ip6_hdr *); 437 438 /* Don't allow packet length sizes that will crash */ 439 if (((u_short)ntohs(ip6->ip6_plen) > m->m_pkthdr.len)) { 440 m_freem(m); 441 return (EINVAL); 442 } 443 break; 444 } 445 #endif 446 } 447 448 #ifdef MAC 449 mac_socket_create_mbuf(so, m); 450 #endif 451 452 error = 0; 453 switch (family) { 454 #ifdef INET 455 case AF_INET: 456 error = ip_output(m, NULL, NULL, 457 ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) 458 | IP_ALLOWBROADCAST | IP_RAWOUTPUT, NULL, NULL); 459 break; 460 #endif 461 #ifdef INET6 462 case AF_INET6: 463 error = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 464 break; 465 #endif 466 } 467 if (error == 0) 468 DIVSTAT_INC(outbound); 469 470 return (error); 471 } 472 473 /* 474 * Schedules mbuf @m for local processing via IPv4/IPv6 netisr queue. 475 * 476 * Returns 0 on success or an errno value on failure. @m is always consumed. 477 */ 478 static int 479 div_output_inbound(int family, struct socket *so, struct mbuf *m, 480 struct sockaddr_in *sin) 481 { 482 struct ifaddr *ifa; 483 484 if (m->m_pkthdr.rcvif == NULL) { 485 /* 486 * No luck with the name, check by IP address. 487 * Clear the port and the ifname to make sure 488 * there are no distractions for ifa_ifwithaddr. 489 */ 490 491 /* XXX: broken for IPv6 */ 492 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 493 sin->sin_port = 0; 494 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 495 if (ifa == NULL) { 496 m_freem(m); 497 return (EADDRNOTAVAIL); 498 } 499 m->m_pkthdr.rcvif = ifa->ifa_ifp; 500 } 501 #ifdef MAC 502 mac_socket_create_mbuf(so, m); 503 #endif 504 /* Send packet to input processing via netisr */ 505 switch (family) { 506 #ifdef INET 507 case AF_INET: 508 { 509 const struct ip *ip; 510 511 ip = mtod(m, struct ip *); 512 /* 513 * Restore M_BCAST flag when destination address is 514 * broadcast. It is expected by ip_tryforward(). 515 */ 516 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) 517 m->m_flags |= M_MCAST; 518 else if (in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) 519 m->m_flags |= M_BCAST; 520 netisr_queue_src(NETISR_IP, (uintptr_t)so, m); 521 DIVSTAT_INC(inbound); 522 break; 523 } 524 #endif 525 #ifdef INET6 526 case AF_INET6: 527 netisr_queue_src(NETISR_IPV6, (uintptr_t)so, m); 528 DIVSTAT_INC(inbound); 529 break; 530 #endif 531 default: 532 m_freem(m); 533 return (EINVAL); 534 } 535 536 return (0); 537 } 538 539 static int 540 div_attach(struct socket *so, int proto, struct thread *td) 541 { 542 struct divcb *dcb; 543 int error; 544 545 if (td != NULL) { 546 error = priv_check(td, PRIV_NETINET_DIVERT); 547 if (error) 548 return (error); 549 } 550 error = soreserve(so, div_sendspace, div_recvspace); 551 if (error) 552 return error; 553 dcb = malloc(sizeof(*dcb), M_PCB, M_WAITOK); 554 dcb->dcb_bound = DCB_UNBOUND; 555 dcb->dcb_socket = so; 556 DIVERT_LOCK(); 557 V_dcb_count++; 558 dcb->dcb_gencnt = ++V_dcb_gencnt; 559 DIVERT_UNLOCK(); 560 so->so_pcb = dcb; 561 562 return (0); 563 } 564 565 static void 566 div_free(epoch_context_t ctx) 567 { 568 struct divcb *dcb = __containerof(ctx, struct divcb, dcb_epochctx); 569 570 free(dcb, M_PCB); 571 } 572 573 static void 574 div_detach(struct socket *so) 575 { 576 struct divcb *dcb = so->so_pcb; 577 578 so->so_pcb = NULL; 579 DIVERT_LOCK(); 580 if (dcb->dcb_bound != DCB_UNBOUND) 581 SLIST_REMOVE(&V_divhash[DCBHASH(dcb)], dcb, divcb, dcb_next); 582 V_dcb_count--; 583 V_dcb_gencnt++; 584 DIVERT_UNLOCK(); 585 NET_EPOCH_CALL(div_free, &dcb->dcb_epochctx); 586 } 587 588 static int 589 div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 590 { 591 struct divcb *dcb; 592 uint16_t port; 593 594 if (nam->sa_family != AF_INET) 595 return EAFNOSUPPORT; 596 if (nam->sa_len != sizeof(struct sockaddr_in)) 597 return EINVAL; 598 port = ((struct sockaddr_in *)nam)->sin_port; 599 DIVERT_LOCK(); 600 SLIST_FOREACH(dcb, &V_divhash[DIVHASH(port)], dcb_next) 601 if (dcb->dcb_port == port) { 602 DIVERT_UNLOCK(); 603 return (EADDRINUSE); 604 } 605 dcb = so->so_pcb; 606 if (dcb->dcb_bound != DCB_UNBOUND) 607 SLIST_REMOVE(&V_divhash[DCBHASH(dcb)], dcb, divcb, dcb_next); 608 dcb->dcb_port = port; 609 SLIST_INSERT_HEAD(&V_divhash[DIVHASH(port)], dcb, dcb_next); 610 DIVERT_UNLOCK(); 611 612 return (0); 613 } 614 615 static int 616 div_shutdown(struct socket *so) 617 { 618 619 socantsendmore(so); 620 return 0; 621 } 622 623 static int 624 div_pcblist(SYSCTL_HANDLER_ARGS) 625 { 626 struct xinpgen xig; 627 struct divcb *dcb; 628 int error; 629 630 if (req->newptr != 0) 631 return EPERM; 632 633 if (req->oldptr == 0) { 634 u_int n; 635 636 n = V_dcb_count; 637 n += imax(n / 8, 10); 638 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 639 return 0; 640 } 641 642 if ((error = sysctl_wire_old_buffer(req, 0)) != 0) 643 return (error); 644 645 bzero(&xig, sizeof(xig)); 646 xig.xig_len = sizeof xig; 647 xig.xig_count = V_dcb_count; 648 xig.xig_gen = V_dcb_gencnt; 649 xig.xig_sogen = so_gencnt; 650 error = SYSCTL_OUT(req, &xig, sizeof xig); 651 if (error) 652 return error; 653 654 DIVERT_LOCK(); 655 for (int i = 0; i < DIVHASHSIZE; i++) 656 SLIST_FOREACH(dcb, &V_divhash[i], dcb_next) { 657 if (dcb->dcb_gencnt <= xig.xig_gen) { 658 struct xinpcb xi; 659 660 bzero(&xi, sizeof(xi)); 661 xi.xi_len = sizeof(struct xinpcb); 662 sotoxsocket(dcb->dcb_socket, &xi.xi_socket); 663 xi.inp_gencnt = dcb->dcb_gencnt; 664 xi.inp_vflag = INP_IPV4; /* XXX: netstat(1) */ 665 xi.inp_inc.inc_ie.ie_lport = dcb->dcb_port; 666 error = SYSCTL_OUT(req, &xi, sizeof xi); 667 if (error) 668 goto errout; 669 } 670 } 671 672 /* 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 xig.xig_gen = V_dcb_gencnt; 680 xig.xig_sogen = so_gencnt; 681 xig.xig_count = V_dcb_count; 682 error = SYSCTL_OUT(req, &xig, sizeof xig); 683 684 errout: 685 DIVERT_UNLOCK(); 686 687 return (error); 688 } 689 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, 690 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, div_pcblist, 691 "S,xinpcb", "List of active divert sockets"); 692 693 static struct protosw div_protosw = { 694 .pr_type = SOCK_RAW, 695 .pr_flags = PR_ATOMIC|PR_ADDR, 696 .pr_attach = div_attach, 697 .pr_bind = div_bind, 698 .pr_detach = div_detach, 699 .pr_send = div_send, 700 .pr_shutdown = div_shutdown, 701 }; 702 703 static struct domain divertdomain = { 704 .dom_family = PF_DIVERT, 705 .dom_name = "divert", 706 .dom_nprotosw = 1, 707 .dom_protosw = { &div_protosw }, 708 }; 709 710 static int 711 div_modevent(module_t mod, int type, void *unused) 712 { 713 int err = 0; 714 715 switch (type) { 716 case MOD_LOAD: 717 domain_add(&divertdomain); 718 ip_divert_ptr = divert_packet; 719 break; 720 case MOD_QUIESCE: 721 /* 722 * IPDIVERT may normally not be unloaded because of the 723 * potential race conditions. Tell kldunload we can't be 724 * unloaded unless the unload is forced. 725 */ 726 err = EPERM; 727 break; 728 case MOD_UNLOAD: 729 /* 730 * Forced unload. 731 * 732 * Module ipdivert can only be unloaded if no sockets are 733 * connected. Maybe this can be changed later to forcefully 734 * disconnect any open sockets. 735 * 736 * XXXRW: Note that there is a slight race here, as a new 737 * socket open request could be spinning on the lock and then 738 * we destroy the lock. 739 * 740 * XXXGL: One more reason this code is incorrect is that it 741 * checks only the current vnet. 742 */ 743 DIVERT_LOCK(); 744 if (V_dcb_count != 0) { 745 DIVERT_UNLOCK(); 746 err = EBUSY; 747 break; 748 } 749 DIVERT_UNLOCK(); 750 ip_divert_ptr = NULL; 751 domain_remove(&divertdomain); 752 break; 753 default: 754 err = EOPNOTSUPP; 755 break; 756 } 757 return err; 758 } 759 760 static moduledata_t ipdivertmod = { 761 "ipdivert", 762 div_modevent, 763 0 764 }; 765 766 DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY); 767 MODULE_VERSION(ipdivert, 1); 768