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#include "opt_inet.h" 34#include "opt_inet6.h" 35#include "opt_sctp.h" 36#ifndef INET 37#error "IPDIVERT requires INET" 38#endif 39 40#include <sys/param.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/protosw.h> 50#include <sys/socket.h> 51#include <sys/socketvar.h> 52#include <sys/sysctl.h> 53#include <net/vnet.h> 54 55#include <net/if.h> 56#include <net/netisr.h> 57 58#include <netinet/in.h> 59#include <netinet/in_pcb.h> 60#include <netinet/in_systm.h> 61#include <netinet/in_var.h> 62#include <netinet/ip.h> 63#include <netinet/ip_var.h> 64#ifdef INET6 65#include <netinet/ip6.h> 66#include <netinet6/ip6_var.h> 67#endif 68#ifdef SCTP 69#include <netinet/sctp_crc32.h> 70#endif 71 72#include <security/mac/mac_framework.h> 73 74/* 75 * Divert sockets 76 */ 77 78/* 79 * Allocate enough space to hold a full IP packet 80 */ 81#define DIVSNDQ (65536 + 100) 82#define DIVRCVQ (65536 + 100) 83 84/* 85 * Divert sockets work in conjunction with ipfw or other packet filters, 86 * see the divert(4) manpage for features. 87 * Packets are selected by the packet filter and tagged with an 88 * MTAG_IPFW_RULE tag carrying the 'divert port' number (as set by 89 * the packet filter) and information on the matching filter rule for 90 * subsequent reinjection. The divert_port is used to put the packet 91 * on the corresponding divert socket, while the rule number is passed 92 * up (at least partially) as the sin_port in the struct sockaddr. 93 * 94 * Packets written to the divert socket carry in sin_addr a 95 * destination address, and in sin_port the number of the filter rule 96 * after which to continue processing. 97 * If the destination address is INADDR_ANY, the packet is treated as 98 * as outgoing and sent to ip_output(); otherwise it is treated as 99 * incoming and sent to ip_input(). 100 * Further, sin_zero carries some information on the interface, 101 * which can be used in the reinject -- see comments in the code. 102 * 103 * On reinjection, processing in ip_input() and ip_output() 104 * will be exactly the same as for the original packet, except that 105 * packet filter processing will start at the rule number after the one 106 * written in the sin_port (ipfw does not allow a rule #0, so sin_port=0 107 * will apply the entire ruleset to the packet). 108 */ 109 110/* Internal variables. */ 111static VNET_DEFINE(struct inpcbhead, divcb); 112static VNET_DEFINE(struct inpcbinfo, divcbinfo); 113 114#define V_divcb VNET(divcb) 115#define V_divcbinfo VNET(divcbinfo) 116 117static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 118static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 119 120static eventhandler_tag ip_divert_event_tag; 121 122/* 123 * Initialize divert connection block queue. 124 */ 125static void 126div_zone_change(void *tag) 127{ 128 129 uma_zone_set_max(V_divcbinfo.ipi_zone, maxsockets); 130} 131 132static int 133div_inpcb_init(void *mem, int size, int flags) 134{ 135 struct inpcb *inp = mem; 136 137 INP_LOCK_INIT(inp, "inp", "divinp"); 138 return (0); 139} 140 141static void 142div_inpcb_fini(void *mem, int size) 143{ 144 struct inpcb *inp = mem; 145 146 INP_LOCK_DESTROY(inp); 147} 148 149static void 150div_init(void) 151{ 152 153 /* 154 * XXX We don't use the hash list for divert IP, but it's easier to 155 * allocate one-entry hash lists than it is to check all over the 156 * place for hashbase == NULL. 157 */ 158 in_pcbinfo_init(&V_divcbinfo, "div", &V_divcb, 1, 1, "divcb", 159 div_inpcb_init, div_inpcb_fini, UMA_ZONE_NOFREE, 160 IPI_HASHFIELDS_NONE); 161} 162 163static void 164div_destroy(void) 165{ 166 167 in_pcbinfo_destroy(&V_divcbinfo); 168} 169 170/* 171 * IPPROTO_DIVERT is not in the real IP protocol number space; this 172 * function should never be called. Just in case, drop any packets. 173 */ 174static void 175div_input(struct mbuf *m, int off) 176{ 177 178 KMOD_IPSTAT_INC(ips_noproto); 179 m_freem(m); 180} 181 182/* 183 * Divert a packet by passing it up to the divert socket at port 'port'. 184 * 185 * Setup generic address and protocol structures for div_input routine, 186 * then pass them along with mbuf chain. 187 */ 188static void 189divert_packet(struct mbuf *m, int incoming) 190{ 191 struct ip *ip; 192 struct inpcb *inp; 193 struct socket *sa; 194 u_int16_t nport; 195 struct sockaddr_in divsrc; 196 struct m_tag *mtag; 197 198 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL); 199 if (mtag == NULL) { 200 m_freem(m); 201 return; 202 } 203 /* Assure header */ 204 if (m->m_len < sizeof(struct ip) && 205 (m = m_pullup(m, sizeof(struct ip))) == 0) 206 return; 207 ip = mtod(m, struct ip *); 208 209 /* Delayed checksums are currently not compatible with divert. */ 210 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 211 in_delayed_cksum(m); 212 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 213 } 214#ifdef SCTP 215 if (m->m_pkthdr.csum_flags & CSUM_SCTP) { 216 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 217 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 218 } 219#endif 220 bzero(&divsrc, sizeof(divsrc)); 221 divsrc.sin_len = sizeof(divsrc); 222 divsrc.sin_family = AF_INET; 223 /* record matching rule, in host format */ 224 divsrc.sin_port = ((struct ipfw_rule_ref *)(mtag+1))->rulenum; 225 /* 226 * Record receive interface address, if any. 227 * But only for incoming packets. 228 */ 229 if (incoming) { 230 struct ifaddr *ifa; 231 struct ifnet *ifp; 232 233 /* Sanity check */ 234 M_ASSERTPKTHDR(m); 235 236 /* Find IP address for receive interface */ 237 ifp = m->m_pkthdr.rcvif; 238 if_addr_rlock(ifp); 239 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 240 if (ifa->ifa_addr->sa_family != AF_INET) 241 continue; 242 divsrc.sin_addr = 243 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 244 break; 245 } 246 if_addr_runlock(ifp); 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)(((struct ipfw_rule_ref *)(mtag+1))->info)); 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 KMOD_IPSTAT_INC(ips_noproto); 299 KMOD_IPSTAT_DEC(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 */ 310static int 311div_output(struct socket *so, struct mbuf *m, struct sockaddr_in *sin, 312 struct mbuf *control) 313{ 314 struct ip *const ip = mtod(m, struct ip *); 315 struct m_tag *mtag; 316 struct ipfw_rule_ref *dt; 317 int error = 0; 318 319 /* 320 * An mbuf may hasn't come from userland, but we pretend 321 * that it has. 322 */ 323 m->m_pkthdr.rcvif = NULL; 324 m->m_nextpkt = NULL; 325 M_SETFIB(m, so->so_fibnum); 326 327 if (control) 328 m_freem(control); /* XXX */ 329 330 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL); 331 if (mtag == NULL) { 332 /* this should be normal */ 333 mtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 334 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 335 if (mtag == NULL) { 336 error = ENOBUFS; 337 goto cantsend; 338 } 339 m_tag_prepend(m, mtag); 340 } 341 dt = (struct ipfw_rule_ref *)(mtag+1); 342 343 /* Loopback avoidance and state recovery */ 344 if (sin) { 345 int i; 346 347 /* set the starting point. We provide a non-zero slot, 348 * but a non_matching chain_id to skip that info and use 349 * the rulenum/rule_id. 350 */ 351 dt->slot = 1; /* dummy, chain_id is invalid */ 352 dt->chain_id = 0; 353 dt->rulenum = sin->sin_port+1; /* host format ? */ 354 dt->rule_id = 0; 355 /* 356 * Find receive interface with the given name, stuffed 357 * (if it exists) in the sin_zero[] field. 358 * The name is user supplied data so don't trust its size 359 * or that it is zero terminated. 360 */ 361 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 362 ; 363 if ( i > 0 && i < sizeof(sin->sin_zero)) 364 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 365 } 366 367 /* Reinject packet into the system as incoming or outgoing */ 368 if (!sin || sin->sin_addr.s_addr == 0) { 369 struct mbuf *options = NULL; 370 struct inpcb *inp; 371 372 dt->info |= IPFW_IS_DIVERT | IPFW_INFO_OUT; 373 inp = sotoinpcb(so); 374 INP_RLOCK(inp); 375 switch (ip->ip_v) { 376 case IPVERSION: 377 /* 378 * Don't allow both user specified and setsockopt 379 * options, and don't allow packet length sizes that 380 * will crash. 381 */ 382 if ((((ip->ip_hl << 2) != sizeof(struct ip)) && 383 inp->inp_options != NULL) || 384 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 385 error = EINVAL; 386 INP_RUNLOCK(inp); 387 goto cantsend; 388 } 389 break; 390#ifdef INET6 391 case IPV6_VERSION >> 4: 392 { 393 struct ip6_hdr *const ip6 = mtod(m, struct ip6_hdr *); 394 395 /* Don't allow packet length sizes that will crash */ 396 if (((u_short)ntohs(ip6->ip6_plen) > m->m_pkthdr.len)) { 397 error = EINVAL; 398 INP_RUNLOCK(inp); 399 goto cantsend; 400 } 401 break; 402 } 403#endif 404 default: 405 error = EINVAL; 406 INP_RUNLOCK(inp); 407 goto cantsend; 408 } 409 410 /* Send packet to output processing */ 411 KMOD_IPSTAT_INC(ips_rawout); /* XXX */ 412 413#ifdef MAC 414 mac_inpcb_create_mbuf(inp, m); 415#endif 416 /* 417 * Get ready to inject the packet into ip_output(). 418 * Just in case socket options were specified on the 419 * divert socket, we duplicate them. This is done 420 * to avoid having to hold the PCB locks over the call 421 * to ip_output(), as doing this results in a number of 422 * lock ordering complexities. 423 * 424 * Note that we set the multicast options argument for 425 * ip_output() to NULL since it should be invariant that 426 * they are not present. 427 */ 428 KASSERT(inp->inp_moptions == NULL, 429 ("multicast options set on a divert socket")); 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_NOWAIT); 439 if (options == NULL) { 440 INP_RUNLOCK(inp); 441 error = ENOBUFS; 442 goto cantsend; 443 } 444 } 445 INP_RUNLOCK(inp); 446 447 switch (ip->ip_v) { 448 case IPVERSION: 449 error = ip_output(m, options, NULL, 450 ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) 451 | IP_ALLOWBROADCAST | IP_RAWOUTPUT, NULL, NULL); 452 break; 453#ifdef INET6 454 case IPV6_VERSION >> 4: 455 error = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 456 break; 457#endif 458 } 459 if (options != NULL) 460 m_freem(options); 461 } else { 462 dt->info |= IPFW_IS_DIVERT | IPFW_INFO_IN; 463 if (m->m_pkthdr.rcvif == NULL) { 464 /* 465 * No luck with the name, check by IP address. 466 * Clear the port and the ifname to make sure 467 * there are no distractions for ifa_ifwithaddr. 468 */ 469 struct ifaddr *ifa; 470 471 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 472 sin->sin_port = 0; 473 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 474 if (ifa == NULL) { 475 error = EADDRNOTAVAIL; 476 goto cantsend; 477 } 478 m->m_pkthdr.rcvif = ifa->ifa_ifp; 479 ifa_free(ifa); 480 } 481#ifdef MAC 482 mac_socket_create_mbuf(so, m); 483#endif 484 /* Send packet to input processing via netisr */ 485 switch (ip->ip_v) { 486 case IPVERSION: 487 netisr_queue_src(NETISR_IP, (uintptr_t)so, m); 488 break; 489#ifdef INET6 490 case IPV6_VERSION >> 4: 491 netisr_queue_src(NETISR_IPV6, (uintptr_t)so, m); 492 break; 493#endif 494 default: 495 error = EINVAL; 496 goto cantsend; 497 } 498 } 499 500 return (error); 501 502cantsend: 503 m_freem(m); 504 return (error); 505} 506 507static int 508div_attach(struct socket *so, int proto, struct thread *td) 509{ 510 struct inpcb *inp; 511 int error; 512 513 inp = sotoinpcb(so); 514 KASSERT(inp == NULL, ("div_attach: inp != NULL")); 515 if (td != NULL) { 516 error = priv_check(td, PRIV_NETINET_DIVERT); 517 if (error) 518 return (error); 519 } 520 error = soreserve(so, div_sendspace, div_recvspace); 521 if (error) 522 return error; 523 INP_INFO_WLOCK(&V_divcbinfo); 524 error = in_pcballoc(so, &V_divcbinfo); 525 if (error) { 526 INP_INFO_WUNLOCK(&V_divcbinfo); 527 return error; 528 } 529 inp = (struct inpcb *)so->so_pcb; 530 INP_INFO_WUNLOCK(&V_divcbinfo); 531 inp->inp_ip_p = proto; 532 inp->inp_vflag |= INP_IPV4; 533 inp->inp_flags |= INP_HDRINCL; 534 INP_WUNLOCK(inp); 535 return 0; 536} 537 538static void 539div_detach(struct socket *so) 540{ 541 struct inpcb *inp; 542 543 inp = sotoinpcb(so); 544 KASSERT(inp != NULL, ("div_detach: inp == NULL")); 545 INP_INFO_WLOCK(&V_divcbinfo); 546 INP_WLOCK(inp); 547 in_pcbdetach(inp); 548 in_pcbfree(inp); 549 INP_INFO_WUNLOCK(&V_divcbinfo); 550} 551 552static int 553div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 554{ 555 struct inpcb *inp; 556 int error; 557 558 inp = sotoinpcb(so); 559 KASSERT(inp != NULL, ("div_bind: inp == NULL")); 560 /* in_pcbbind assumes that nam is a sockaddr_in 561 * and in_pcbbind requires a valid address. Since divert 562 * sockets don't we need to make sure the address is 563 * filled in properly. 564 * XXX -- divert should not be abusing in_pcbind 565 * and should probably have its own family. 566 */ 567 if (nam->sa_family != AF_INET) 568 return EAFNOSUPPORT; 569 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 570 INP_INFO_WLOCK(&V_divcbinfo); 571 INP_WLOCK(inp); 572 INP_HASH_WLOCK(&V_divcbinfo); 573 error = in_pcbbind(inp, nam, td->td_ucred); 574 INP_HASH_WUNLOCK(&V_divcbinfo); 575 INP_WUNLOCK(inp); 576 INP_INFO_WUNLOCK(&V_divcbinfo); 577 return error; 578} 579 580static int 581div_shutdown(struct socket *so) 582{ 583 struct inpcb *inp; 584 585 inp = sotoinpcb(so); 586 KASSERT(inp != NULL, ("div_shutdown: inp == NULL")); 587 INP_WLOCK(inp); 588 socantsendmore(so); 589 INP_WUNLOCK(inp); 590 return 0; 591} 592 593static int 594div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 595 struct mbuf *control, struct thread *td) 596{ 597 598 /* Packet must have a header (but that's about it) */ 599 if (m->m_len < sizeof (struct ip) && 600 (m = m_pullup(m, sizeof (struct ip))) == 0) { 601 KMOD_IPSTAT_INC(ips_toosmall); 602 m_freem(m); 603 return EINVAL; 604 } 605 606 /* Send packet */ 607 return div_output(so, m, (struct sockaddr_in *)nam, control); 608} 609 610static void 611div_ctlinput(int cmd, struct sockaddr *sa, void *vip) 612{ 613 struct in_addr faddr; 614 615 faddr = ((struct sockaddr_in *)sa)->sin_addr; 616 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 617 return; 618 if (PRC_IS_REDIRECT(cmd)) 619 return; 620} 621 622static int 623div_pcblist(SYSCTL_HANDLER_ARGS) 624{ 625 int error, i, n; 626 struct inpcb *inp, **inp_list; 627 inp_gen_t gencnt; 628 struct xinpgen xig; 629 630 /* 631 * The process of preparing the TCB list is too time-consuming and 632 * resource-intensive to repeat twice on every request. 633 */ 634 if (req->oldptr == 0) { 635 n = V_divcbinfo.ipi_count; 636 n += imax(n / 8, 10); 637 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 638 return 0; 639 } 640 641 if (req->newptr != 0) 642 return EPERM; 643 644 /* 645 * OK, now we're committed to doing something. 646 */ 647 INP_INFO_RLOCK(&V_divcbinfo); 648 gencnt = V_divcbinfo.ipi_gencnt; 649 n = V_divcbinfo.ipi_count; 650 INP_INFO_RUNLOCK(&V_divcbinfo); 651 652 error = sysctl_wire_old_buffer(req, 653 2 * sizeof(xig) + n*sizeof(struct xinpcb)); 654 if (error != 0) 655 return (error); 656 657 xig.xig_len = sizeof xig; 658 xig.xig_count = n; 659 xig.xig_gen = gencnt; 660 xig.xig_sogen = so_gencnt; 661 error = SYSCTL_OUT(req, &xig, sizeof xig); 662 if (error) 663 return error; 664 665 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 666 if (inp_list == 0) 667 return ENOMEM; 668 669 INP_INFO_RLOCK(&V_divcbinfo); 670 for (inp = LIST_FIRST(V_divcbinfo.ipi_listhead), i = 0; inp && i < n; 671 inp = LIST_NEXT(inp, inp_list)) { 672 INP_WLOCK(inp); 673 if (inp->inp_gencnt <= gencnt && 674 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 675 in_pcbref(inp); 676 inp_list[i++] = inp; 677 } 678 INP_WUNLOCK(inp); 679 } 680 INP_INFO_RUNLOCK(&V_divcbinfo); 681 n = i; 682 683 error = 0; 684 for (i = 0; i < n; i++) { 685 inp = inp_list[i]; 686 INP_RLOCK(inp); 687 if (inp->inp_gencnt <= gencnt) { 688 struct xinpcb xi; 689 bzero(&xi, sizeof(xi)); 690 xi.xi_len = sizeof xi; 691 /* XXX should avoid extra copy */ 692 bcopy(inp, &xi.xi_inp, sizeof *inp); 693 if (inp->inp_socket) 694 sotoxsocket(inp->inp_socket, &xi.xi_socket); 695 INP_RUNLOCK(inp); 696 error = SYSCTL_OUT(req, &xi, sizeof xi); 697 } else 698 INP_RUNLOCK(inp); 699 } 700 INP_INFO_WLOCK(&V_divcbinfo); 701 for (i = 0; i < n; i++) { 702 inp = inp_list[i]; 703 INP_RLOCK(inp); 704 if (!in_pcbrele_rlocked(inp)) 705 INP_RUNLOCK(inp); 706 } 707 INP_INFO_WUNLOCK(&V_divcbinfo); 708 709 if (!error) { 710 /* 711 * Give the user an updated idea of our state. 712 * If the generation differs from what we told 713 * her before, she knows that something happened 714 * while we were processing this request, and it 715 * might be necessary to retry. 716 */ 717 INP_INFO_RLOCK(&V_divcbinfo); 718 xig.xig_gen = V_divcbinfo.ipi_gencnt; 719 xig.xig_sogen = so_gencnt; 720 xig.xig_count = V_divcbinfo.ipi_count; 721 INP_INFO_RUNLOCK(&V_divcbinfo); 722 error = SYSCTL_OUT(req, &xig, sizeof xig); 723 } 724 free(inp_list, M_TEMP); 725 return error; 726} 727 728#ifdef SYSCTL_NODE 729static SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, 730 "IPDIVERT"); 731SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD, 732 NULL, 0, div_pcblist, "S,xinpcb", "List of active divert sockets"); 733#endif 734 735struct pr_usrreqs div_usrreqs = { 736 .pru_attach = div_attach, 737 .pru_bind = div_bind, 738 .pru_control = in_control, 739 .pru_detach = div_detach, 740 .pru_peeraddr = in_getpeeraddr, 741 .pru_send = div_send, 742 .pru_shutdown = div_shutdown, 743 .pru_sockaddr = in_getsockaddr, 744 .pru_sosetlabel = in_pcbsosetlabel 745}; 746 747struct protosw div_protosw = { 748 .pr_type = SOCK_RAW, 749 .pr_protocol = IPPROTO_DIVERT, 750 .pr_flags = PR_ATOMIC|PR_ADDR, 751 .pr_input = div_input, 752 .pr_ctlinput = div_ctlinput, 753 .pr_ctloutput = ip_ctloutput, 754 .pr_init = div_init, 755#ifdef VIMAGE 756 .pr_destroy = div_destroy, 757#endif 758 .pr_usrreqs = &div_usrreqs 759}; 760 761static int 762div_modevent(module_t mod, int type, void *unused) 763{ 764 int err = 0; 765#ifndef VIMAGE 766 int n; 767#endif 768 769 switch (type) { 770 case MOD_LOAD: 771 /* 772 * Protocol will be initialized by pf_proto_register(). 773 * We don't have to register ip_protox because we are not 774 * a true IP protocol that goes over the wire. 775 */ 776 err = pf_proto_register(PF_INET, &div_protosw); 777 if (err != 0) 778 return (err); 779 ip_divert_ptr = divert_packet; 780 ip_divert_event_tag = EVENTHANDLER_REGISTER(maxsockets_change, 781 div_zone_change, NULL, EVENTHANDLER_PRI_ANY); 782 break; 783 case MOD_QUIESCE: 784 /* 785 * IPDIVERT may normally not be unloaded because of the 786 * potential race conditions. Tell kldunload we can't be 787 * unloaded unless the unload is forced. 788 */ 789 err = EPERM; 790 break; 791 case MOD_UNLOAD: 792#ifdef VIMAGE 793 err = EPERM; 794 break; 795#else 796 /* 797 * Forced unload. 798 * 799 * Module ipdivert can only be unloaded if no sockets are 800 * connected. Maybe this can be changed later to forcefully 801 * disconnect any open sockets. 802 * 803 * XXXRW: Note that there is a slight race here, as a new 804 * socket open request could be spinning on the lock and then 805 * we destroy the lock. 806 */ 807 INP_INFO_WLOCK(&V_divcbinfo); 808 n = V_divcbinfo.ipi_count; 809 if (n != 0) { 810 err = EBUSY; 811 INP_INFO_WUNLOCK(&V_divcbinfo); 812 break; 813 } 814 ip_divert_ptr = NULL; 815 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW); 816 INP_INFO_WUNLOCK(&V_divcbinfo); 817 div_destroy(); 818 EVENTHANDLER_DEREGISTER(maxsockets_change, ip_divert_event_tag); 819 break; 820#endif /* !VIMAGE */ 821 default: 822 err = EOPNOTSUPP; 823 break; 824 } 825 return err; 826} 827 828static moduledata_t ipdivertmod = { 829 "ipdivert", 830 div_modevent, 831 0 832}; 833 834DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); 835MODULE_DEPEND(ipdivert, ipfw, 2, 2, 2); 836MODULE_VERSION(ipdivert, 1); 837