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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/sys/netinet/ip_divert.c,v 1.42.2.6 2003/01/23 21:06:45 sam Exp $ 34 * $DragonFly: src/sys/netinet/ip_divert.c,v 1.40 2008/10/21 13:51:01 sephe Exp $ 35 */ 36 37 #define _IP_VHL 38 39 #include "opt_inet.h" 40 #include "opt_ipfw.h" 41 #include "opt_ipdivert.h" 42 #include "opt_ipsec.h" 43 44 #ifndef INET 45 #error "IPDIVERT requires INET." 46 #endif 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/socket.h> 53 #include <sys/protosw.h> 54 #include <sys/socketvar.h> 55 #include <sys/sysctl.h> 56 #include <sys/systm.h> 57 #include <sys/proc.h> 58 #include <sys/priv.h> 59 #include <sys/in_cksum.h> 60 #include <sys/lock.h> 61 #ifdef SMP 62 #include <sys/msgport.h> 63 #endif 64 65 #include <net/if.h> 66 #include <net/route.h> 67 68 #ifdef SMP 69 #include <net/netmsg2.h> 70 #endif 71 #include <sys/thread2.h> 72 #include <sys/mplock2.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/ip.h> 77 #include <netinet/in_pcb.h> 78 #include <netinet/in_var.h> 79 #include <netinet/ip_var.h> 80 #include <netinet/ip_divert.h> 81 82 /* 83 * Divert sockets 84 */ 85 86 /* 87 * Allocate enough space to hold a full IP packet 88 */ 89 #define DIVSNDQ (65536 + 100) 90 #define DIVRCVQ (65536 + 100) 91 92 #define DIV_IS_OUTPUT(sin) ((sin) == NULL || (sin)->sin_addr.s_addr == 0) 93 94 #define DIV_OUTPUT 0x10000 95 #define DIV_INPUT 0x20000 96 97 /* 98 * Divert sockets work in conjunction with ipfw, see the divert(4) 99 * manpage for features. 100 * Internally, packets selected by ipfw in ip_input() or ip_output(), 101 * and never diverted before, are passed to the input queue of the 102 * divert socket with a given 'divert_port' number (as specified in 103 * the matching ipfw rule), and they are tagged with a 16 bit cookie 104 * (representing the rule number of the matching ipfw rule), which 105 * is passed to process reading from the socket. 106 * 107 * Packets written to the divert socket are again tagged with a cookie 108 * (usually the same as above) and a destination address. 109 * If the destination address is INADDR_ANY then the packet is 110 * treated as outgoing and sent to ip_output(), otherwise it is 111 * treated as incoming and sent to ip_input(). 112 * In both cases, the packet is tagged with the cookie. 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 * ipfw processing will start at the rule number after the one 117 * written in the cookie (so, tagging a packet with a cookie of 0 118 * will cause it to be effectively considered as a standard packet). 119 */ 120 121 /* Internal variables */ 122 static struct inpcbinfo divcbinfo; 123 124 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 125 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 126 127 static struct mbuf *ip_divert(struct mbuf *, int, int); 128 129 /* 130 * Initialize divert connection block queue. 131 */ 132 void 133 div_init(void) 134 { 135 in_pcbinfo_init(&divcbinfo); 136 /* 137 * XXX We don't use the hash list for divert IP, but it's easier 138 * to allocate a one entry hash list than it is to check all 139 * over the place for hashbase == NULL. 140 */ 141 divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask); 142 divcbinfo.porthashbase = hashinit(1, M_PCB, &divcbinfo.porthashmask); 143 divcbinfo.wildcardhashbase = hashinit(1, M_PCB, 144 &divcbinfo.wildcardhashmask); 145 divcbinfo.ipi_size = sizeof(struct inpcb); 146 ip_divert_p = ip_divert; 147 } 148 149 /* 150 * IPPROTO_DIVERT is not a real IP protocol; don't allow any packets 151 * with that protocol number to enter the system from the outside. 152 */ 153 void 154 div_input(struct mbuf *m, ...) 155 { 156 ipstat.ips_noproto++; 157 m_freem(m); 158 } 159 160 struct lwkt_port * 161 div_soport(struct socket *so, struct sockaddr *nam, struct mbuf **mptr) 162 { 163 struct sockaddr_in *sin; 164 struct mbuf *m; 165 int dir; 166 167 sin = (struct sockaddr_in *)nam; 168 m = *mptr; 169 M_ASSERTPKTHDR(m); 170 171 m->m_pkthdr.rcvif = NULL; 172 dir = DIV_IS_OUTPUT(sin) ? IP_MPORT_OUT : IP_MPORT_IN; 173 174 if (sin != NULL) { 175 int i; 176 177 /* 178 * Try locating the interface, if we originally had one. 179 * This is done even for outgoing packets, since for a 180 * forwarded packet, there must be an interface attached. 181 * 182 * Find receive interface with the given name, stuffed 183 * (if it exists) in the sin_zero[] field. 184 * The name is user supplied data so don't trust its size 185 * or that it is zero terminated. 186 */ 187 for (i = 0; sin->sin_zero[i] && i < sizeof(sin->sin_zero); i++) 188 ; 189 if (i > 0 && i < sizeof(sin->sin_zero)) 190 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 191 } 192 193 if (dir == IP_MPORT_IN && m->m_pkthdr.rcvif == NULL) { 194 /* 195 * No luck with the name, check by IP address. 196 * Clear the port and the ifname to make sure 197 * there are no distractions for ifa_ifwithaddr. 198 * 199 * Be careful not to trash sin->sin_port; it will 200 * be used later in div_output(). 201 */ 202 struct ifaddr *ifa; 203 u_short sin_port; 204 205 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 206 sin_port = sin->sin_port; /* save */ 207 sin->sin_port = 0; 208 ifa = ifa_ifwithaddr((struct sockaddr *)sin); 209 if (ifa == NULL) { 210 m_freem(m); 211 *mptr = NULL; 212 return NULL; 213 } 214 sin->sin_port = sin_port; /* restore */ 215 m->m_pkthdr.rcvif = ifa->ifa_ifp; 216 } 217 218 return ip_mport(mptr, dir); 219 } 220 221 /* 222 * Divert a packet by passing it up to the divert socket at port 'port'. 223 * 224 * Setup generic address and protocol structures for div_input routine, 225 * then pass them along with mbuf chain. 226 */ 227 static void 228 div_packet(struct mbuf *m, int incoming, int port) 229 { 230 struct sockaddr_in divsrc = { sizeof divsrc, AF_INET }; 231 struct inpcb *inp; 232 struct socket *sa; 233 struct m_tag *mtag; 234 struct divert_info *divinfo; 235 u_int16_t nport; 236 237 /* Locate the divert info */ 238 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 239 divinfo = m_tag_data(mtag); 240 divsrc.sin_port = divinfo->skipto; 241 242 /* 243 * Record receive interface address, if any. 244 * But only for incoming packets. 245 */ 246 divsrc.sin_addr.s_addr = 0; 247 if (incoming) { 248 struct ifaddr_container *ifac; 249 250 /* Find IP address for receive interface */ 251 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid], 252 ifa_link) { 253 struct ifaddr *ifa = ifac->ifa; 254 255 if (ifa->ifa_addr == NULL) 256 continue; 257 if (ifa->ifa_addr->sa_family != AF_INET) 258 continue; 259 divsrc.sin_addr = 260 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 261 break; 262 } 263 } 264 /* 265 * Record the incoming interface name whenever we have one. 266 */ 267 if (m->m_pkthdr.rcvif) { 268 /* 269 * Hide the actual interface name in there in the 270 * sin_zero array. XXX This needs to be moved to a 271 * different sockaddr type for divert, e.g. 272 * sockaddr_div with multiple fields like 273 * sockaddr_dl. Presently we have only 7 bytes 274 * but that will do for now as most interfaces 275 * are 4 or less + 2 or less bytes for unit. 276 * There is probably a faster way of doing this, 277 * possibly taking it from the sockaddr_dl on the iface. 278 * This solves the problem of a P2P link and a LAN interface 279 * having the same address, which can result in the wrong 280 * interface being assigned to the packet when fed back 281 * into the divert socket. Theoretically if the daemon saves 282 * and re-uses the sockaddr_in as suggested in the man pages, 283 * this iface name will come along for the ride. 284 * (see div_output for the other half of this.) 285 */ 286 ksnprintf(divsrc.sin_zero, sizeof divsrc.sin_zero, 287 m->m_pkthdr.rcvif->if_xname); 288 } 289 290 /* Put packet on socket queue, if any */ 291 sa = NULL; 292 nport = htons((u_int16_t)port); 293 294 /* 295 * XXX 296 * Following loop to locate the inpcb is MPSAFE since the inpcb 297 * insertion/removal happens on the same CPU (CPU0), however, 298 * saving/testing the socket pointer is not MPSAFE. So we still 299 * need to hold BGL here. 300 */ 301 get_mplock(); 302 LIST_FOREACH(inp, &divcbinfo.pcblisthead, inp_list) { 303 if (inp->inp_flags & INP_PLACEMARKER) 304 continue; 305 if (inp->inp_lport == nport) 306 sa = inp->inp_socket; 307 } 308 if (sa) { 309 if (ssb_appendaddr(&sa->so_rcv, (struct sockaddr *)&divsrc, m, 310 NULL) == 0) 311 m_freem(m); 312 else 313 sorwakeup(sa); 314 rel_mplock(); 315 } else { 316 rel_mplock(); 317 m_freem(m); 318 ipstat.ips_noproto++; 319 ipstat.ips_delivered--; 320 } 321 } 322 323 #ifdef SMP 324 static void 325 div_packet_handler(struct netmsg *nmsg) 326 { 327 struct netmsg_packet *nmp; 328 struct lwkt_msg *msg; 329 struct mbuf *m; 330 int port, incoming = 0; 331 332 nmp = (struct netmsg_packet *)nmsg; 333 m = nmp->nm_packet; 334 335 msg = &nmsg->nm_lmsg; 336 port = msg->u.ms_result32 & 0xffff; 337 if (msg->u.ms_result32 & DIV_INPUT) 338 incoming = 1; 339 340 div_packet(m, incoming, port); 341 } 342 #endif /* SMP */ 343 344 static void 345 divert_packet(struct mbuf *m, int incoming) 346 { 347 struct m_tag *mtag; 348 struct divert_info *divinfo; 349 int port; 350 351 M_ASSERTPKTHDR(m); 352 353 /* Assure header */ 354 if (m->m_len < sizeof(struct ip) && 355 (m = m_pullup(m, sizeof(struct ip))) == NULL) 356 return; 357 358 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 359 KASSERT(mtag != NULL, ("%s no divert tag!", __func__)); 360 divinfo = m_tag_data(mtag); 361 362 port = divinfo->port; 363 KASSERT(port != 0, ("%s: port=0", __func__)); 364 365 #ifdef SMP 366 if (mycpuid != 0) { 367 struct netmsg_packet *nmp; 368 struct lwkt_msg *msg; 369 370 nmp = &m->m_hdr.mh_netmsg; 371 netmsg_init(&nmp->nm_netmsg, NULL, &netisr_apanic_rport, 372 MSGF_MPSAFE, div_packet_handler); 373 nmp->nm_packet = m; 374 375 msg = &nmp->nm_netmsg.nm_lmsg; 376 msg->u.ms_result32 = port; /* port is 16bits */ 377 if (incoming) 378 msg->u.ms_result32 |= DIV_INPUT; 379 else 380 msg->u.ms_result32 |= DIV_OUTPUT; 381 382 lwkt_sendmsg(cpu_portfn(0), &nmp->nm_netmsg.nm_lmsg); 383 } else 384 #endif 385 div_packet(m, incoming, port); 386 } 387 388 /* 389 * Deliver packet back into the IP processing machinery. 390 * 391 * If no address specified, or address is 0.0.0.0, send to ip_output(); 392 * otherwise, send to ip_input() and mark as having been received on 393 * the interface with that address. 394 */ 395 static int 396 div_output(struct socket *so, struct mbuf *m, 397 struct sockaddr_in *sin, struct mbuf *control) 398 { 399 int error = 0; 400 struct m_tag *mtag; 401 struct divert_info *divinfo; 402 403 if (control) 404 m_freem(control); /* XXX */ 405 406 /* 407 * Prepare the tag for divert info. Note that a packet 408 * with a 0 tag in mh_data is effectively untagged, 409 * so we could optimize that case. 410 */ 411 mtag = m_tag_get(PACKET_TAG_IPFW_DIVERT, sizeof(*divinfo), MB_DONTWAIT); 412 if (mtag == NULL) { 413 error = ENOBUFS; 414 goto cantsend; 415 } 416 m_tag_prepend(m, mtag); 417 418 /* Loopback avoidance and state recovery */ 419 divinfo = m_tag_data(mtag); 420 if (sin) 421 divinfo->skipto = sin->sin_port; 422 else 423 divinfo->skipto = 0; 424 425 /* Reinject packet into the system as incoming or outgoing */ 426 if (DIV_IS_OUTPUT(sin)) { 427 struct ip *const ip = mtod(m, struct ip *); 428 429 /* Don't allow packet length sizes that will crash */ 430 if ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len) { 431 error = EINVAL; 432 goto cantsend; 433 } 434 435 /* Convert fields to host order for ip_output() */ 436 ip->ip_len = ntohs(ip->ip_len); 437 ip->ip_off = ntohs(ip->ip_off); 438 439 /* Send packet to output processing */ 440 ipstat.ips_rawout++; /* XXX */ 441 error = ip_output(m, NULL, NULL, 442 (so->so_options & SO_DONTROUTE) | 443 IP_ALLOWBROADCAST | IP_RAWOUTPUT, 444 NULL, NULL); 445 } else { 446 ip_input(m); 447 } 448 return error; 449 450 cantsend: 451 m_freem(m); 452 return error; 453 } 454 455 static int 456 div_attach(struct socket *so, int proto, struct pru_attach_info *ai) 457 { 458 struct inpcb *inp; 459 int error; 460 461 inp = so->so_pcb; 462 if (inp) 463 panic("div_attach"); 464 if ((error = priv_check_cred(ai->p_ucred, PRIV_ROOT, NULL_CRED_OKAY)) != 0) 465 return error; 466 467 error = soreserve(so, div_sendspace, div_recvspace, ai->sb_rlimit); 468 if (error) 469 return error; 470 error = in_pcballoc(so, &divcbinfo); 471 if (error) 472 return error; 473 inp = (struct inpcb *)so->so_pcb; 474 inp->inp_ip_p = proto; 475 inp->inp_vflag |= INP_IPV4; 476 inp->inp_flags |= INP_HDRINCL; 477 /* 478 * The socket is always "connected" because 479 * we always know "where" to send the packet. 480 */ 481 so->so_port = cpu0_soport(so, NULL, NULL); 482 so->so_state |= SS_ISCONNECTED; 483 return 0; 484 } 485 486 static int 487 div_detach(struct socket *so) 488 { 489 struct inpcb *inp; 490 491 inp = so->so_pcb; 492 if (inp == NULL) 493 panic("div_detach"); 494 in_pcbdetach(inp); 495 return 0; 496 } 497 498 static int 499 div_abort(struct socket *so) 500 { 501 soisdisconnected(so); 502 return div_detach(so); 503 } 504 505 static int 506 div_disconnect(struct socket *so) 507 { 508 if (!(so->so_state & SS_ISCONNECTED)) 509 return ENOTCONN; 510 return div_abort(so); 511 } 512 513 static int 514 div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 515 { 516 int error; 517 518 /* 519 * in_pcbbind assumes that nam is a sockaddr_in 520 * and in_pcbbind requires a valid address. Since divert 521 * sockets don't we need to make sure the address is 522 * filled in properly. 523 * XXX -- divert should not be abusing in_pcbind 524 * and should probably have its own family. 525 */ 526 if (nam->sa_family != AF_INET) { 527 error = EAFNOSUPPORT; 528 } else { 529 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 530 error = in_pcbbind(so->so_pcb, nam, td); 531 } 532 return error; 533 } 534 535 static int 536 div_shutdown(struct socket *so) 537 { 538 socantsendmore(so); 539 return 0; 540 } 541 542 static int 543 div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 544 struct mbuf *control, struct thread *td) 545 { 546 /* Length check already done in ip_mport() */ 547 KASSERT(m->m_len >= sizeof(struct ip), ("IP header not in one mbuf")); 548 549 /* Send packet */ 550 return div_output(so, m, (struct sockaddr_in *)nam, control); 551 } 552 553 SYSCTL_DECL(_net_inet_divert); 554 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, &divcbinfo, 0, 555 in_pcblist_global, "S,xinpcb", "List of active divert sockets"); 556 557 struct pr_usrreqs div_usrreqs = { 558 .pru_abort = div_abort, 559 .pru_accept = pru_accept_notsupp, 560 .pru_attach = div_attach, 561 .pru_bind = div_bind, 562 .pru_connect = pru_connect_notsupp, 563 .pru_connect2 = pru_connect2_notsupp, 564 .pru_control = in_control, 565 .pru_detach = div_detach, 566 .pru_disconnect = div_disconnect, 567 .pru_listen = pru_listen_notsupp, 568 .pru_peeraddr = in_setpeeraddr, 569 .pru_rcvd = pru_rcvd_notsupp, 570 .pru_rcvoob = pru_rcvoob_notsupp, 571 .pru_send = div_send, 572 .pru_sense = pru_sense_null, 573 .pru_shutdown = div_shutdown, 574 .pru_sockaddr = in_setsockaddr, 575 .pru_sosend = sosend, 576 .pru_soreceive = soreceive, 577 .pru_sopoll = sopoll 578 }; 579 580 static struct mbuf * 581 ip_divert_out(struct mbuf *m, int tee) 582 { 583 struct mbuf *clone = NULL; 584 struct ip *ip = mtod(m, struct ip *); 585 586 /* Clone packet if we're doing a 'tee' */ 587 if (tee) 588 clone = m_dup(m, MB_DONTWAIT); 589 590 /* 591 * XXX 592 * delayed checksums are not currently compatible 593 * with divert sockets. 594 */ 595 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 596 in_delayed_cksum(m); 597 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 598 } 599 600 /* Restore packet header fields to original values */ 601 ip->ip_len = htons(ip->ip_len); 602 ip->ip_off = htons(ip->ip_off); 603 604 /* Deliver packet to divert input routine */ 605 divert_packet(m, 0); 606 607 /* If 'tee', continue with original packet */ 608 return clone; 609 } 610 611 static struct mbuf * 612 ip_divert_in(struct mbuf *m, int tee) 613 { 614 struct mbuf *clone = NULL; 615 struct ip *ip = mtod(m, struct ip *); 616 struct m_tag *mtag; 617 618 if (ip->ip_off & (IP_MF | IP_OFFMASK)) { 619 const struct divert_info *divinfo; 620 u_short frag_off; 621 int hlen; 622 623 /* 624 * Only trust divert info in the fragment 625 * at offset 0. 626 */ 627 frag_off = ip->ip_off << 3; 628 if (frag_off != 0) { 629 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 630 m_tag_delete(m, mtag); 631 } 632 633 /* 634 * Attempt reassembly; if it succeeds, proceed. 635 * ip_reass() will return a different mbuf. 636 */ 637 m = ip_reass(m); 638 if (m == NULL) 639 return NULL; 640 ip = mtod(m, struct ip *); 641 642 /* Caller need to redispatch the packet, if it is for us */ 643 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; 644 645 /* 646 * Get the header length of the reassembled 647 * packet 648 */ 649 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 650 651 /* 652 * Restore original checksum before diverting 653 * packet 654 */ 655 ip->ip_len += hlen; 656 ip->ip_len = htons(ip->ip_len); 657 ip->ip_off = htons(ip->ip_off); 658 ip->ip_sum = 0; 659 if (hlen == sizeof(struct ip)) 660 ip->ip_sum = in_cksum_hdr(ip); 661 else 662 ip->ip_sum = in_cksum(m, hlen); 663 ip->ip_off = ntohs(ip->ip_off); 664 ip->ip_len = ntohs(ip->ip_len); 665 666 /* 667 * Only use the saved divert info 668 */ 669 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 670 if (mtag == NULL) { 671 /* Wrongly configured ipfw */ 672 kprintf("ip_input no divert info\n"); 673 m_freem(m); 674 return NULL; 675 } 676 divinfo = m_tag_data(mtag); 677 tee = divinfo->tee; 678 } 679 680 /* 681 * Divert or tee packet to the divert protocol if 682 * required. 683 */ 684 685 /* Clone packet if we're doing a 'tee' */ 686 if (tee) 687 clone = m_dup(m, MB_DONTWAIT); 688 689 /* 690 * Restore packet header fields to original 691 * values 692 */ 693 ip->ip_len = htons(ip->ip_len); 694 ip->ip_off = htons(ip->ip_off); 695 696 /* Deliver packet to divert input routine */ 697 divert_packet(m, 1); 698 699 /* Catch invalid reference */ 700 m = NULL; 701 ip = NULL; 702 703 ipstat.ips_delivered++; 704 705 /* If 'tee', continue with original packet */ 706 if (clone != NULL) { 707 /* 708 * Complete processing of the packet. 709 * XXX Better safe than sorry, remove the DIVERT tag. 710 */ 711 mtag = m_tag_find(clone, PACKET_TAG_IPFW_DIVERT, NULL); 712 KKASSERT(mtag != NULL); 713 m_tag_delete(clone, mtag); 714 } 715 return clone; 716 } 717 718 static struct mbuf * 719 ip_divert(struct mbuf *m, int tee, int incoming) 720 { 721 struct mbuf *ret; 722 723 if (incoming) 724 ret = ip_divert_in(m, tee); 725 else 726 ret = ip_divert_out(m, tee); 727 return ret; 728 } 729