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 */ 35 36 #define _IP_VHL 37 38 #include "opt_inet.h" 39 #include "opt_ipdivert.h" 40 #include "opt_ipsec.h" 41 42 #ifndef INET 43 #error "IPDIVERT requires INET." 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/socket.h> 51 #include <sys/protosw.h> 52 #include <sys/socketvar.h> 53 #include <sys/socketvar2.h> 54 #include <sys/sysctl.h> 55 #include <sys/systm.h> 56 #include <sys/proc.h> 57 #include <sys/priv.h> 58 #include <sys/in_cksum.h> 59 #include <sys/lock.h> 60 #include <sys/msgport.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 65 #include <net/netmsg2.h> 66 #include <net/netisr2.h> 67 #include <sys/thread2.h> 68 #include <sys/mplock2.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_systm.h> 72 #include <netinet/ip.h> 73 #include <netinet/in_pcb.h> 74 #include <netinet/in_var.h> 75 #include <netinet/ip_var.h> 76 #include <netinet/ip_divert.h> 77 78 /* 79 * Divert sockets 80 */ 81 82 /* 83 * Allocate enough space to hold a full IP packet 84 */ 85 #define DIVSNDQ (65536 + 100) 86 #define DIVRCVQ (65536 + 100) 87 88 #define DIV_IS_OUTPUT(sin) ((sin) == NULL || (sin)->sin_addr.s_addr == 0) 89 90 #define DIV_OUTPUT 0x10000 91 #define DIV_INPUT 0x20000 92 93 /* 94 * Divert sockets work in conjunction with ipfw, see the divert(4) 95 * manpage for features. 96 * Internally, packets selected by ipfw in ip_input() or ip_output(), 97 * and never diverted before, are passed to the input queue of the 98 * divert socket with a given 'divert_port' number (as specified in 99 * the matching ipfw rule), and they are tagged with a 16 bit cookie 100 * (representing the rule number of the matching ipfw rule), which 101 * is passed to process reading from the socket. 102 * 103 * Packets written to the divert socket are again tagged with a cookie 104 * (usually the same as above) and a destination address. 105 * If the destination address is INADDR_ANY then the packet is 106 * treated as outgoing and sent to ip_output(), otherwise it is 107 * treated as incoming and sent to ip_input(). 108 * In both cases, the packet is tagged with the cookie. 109 * 110 * On reinjection, processing in ip_input() and ip_output() 111 * will be exactly the same as for the original packet, except that 112 * ipfw processing will start at the rule number after the one 113 * written in the cookie (so, tagging a packet with a cookie of 0 114 * will cause it to be effectively considered as a standard packet). 115 */ 116 117 /* Internal variables */ 118 static struct inpcbinfo divcbinfo; 119 120 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 121 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 122 123 static struct mbuf *ip_divert(struct mbuf *, int, int); 124 125 static struct lwkt_token div_token = LWKT_TOKEN_INITIALIZER(div_token); 126 127 /* 128 * Initialize divert connection block queue. 129 */ 130 void 131 div_init(void) 132 { 133 in_pcbinfo_init(&divcbinfo); 134 /* 135 * XXX We don't use the hash list for divert IP, but it's easier 136 * to allocate a one entry hash list than it is to check all 137 * over the place for hashbase == NULL. 138 */ 139 divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask); 140 divcbinfo.porthashbase = hashinit(1, M_PCB, &divcbinfo.porthashmask); 141 divcbinfo.wildcardhashbase = hashinit(1, M_PCB, 142 &divcbinfo.wildcardhashmask); 143 divcbinfo.ipi_size = sizeof(struct inpcb); 144 ip_divert_p = ip_divert; 145 } 146 147 /* 148 * IPPROTO_DIVERT is not a real IP protocol; don't allow any packets 149 * with that protocol number to enter the system from the outside. 150 */ 151 int 152 div_input(struct mbuf **mp, int *offp, int proto) 153 { 154 struct mbuf *m = *mp; 155 156 ipstat.ips_noproto++; 157 m_freem(m); 158 return(IPPROTO_DONE); 159 } 160 161 /* 162 * Divert a packet by passing it up to the divert socket at port 'port'. 163 * 164 * Setup generic address and protocol structures for div_input routine, 165 * then pass them along with mbuf chain. 166 */ 167 static void 168 div_packet(struct mbuf *m, int incoming, int port) 169 { 170 struct sockaddr_in divsrc = { sizeof divsrc, AF_INET }; 171 struct inpcb *inp; 172 struct socket *sa; 173 struct m_tag *mtag; 174 struct divert_info *divinfo; 175 u_int16_t nport; 176 177 /* Locate the divert info */ 178 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 179 divinfo = m_tag_data(mtag); 180 divsrc.sin_port = divinfo->skipto; 181 182 /* 183 * Record receive interface address, if any. 184 * But only for incoming packets. 185 */ 186 divsrc.sin_addr.s_addr = 0; 187 if (incoming) { 188 struct ifaddr_container *ifac; 189 190 /* Find IP address for receive interface */ 191 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid], 192 ifa_link) { 193 struct ifaddr *ifa = ifac->ifa; 194 195 if (ifa->ifa_addr == NULL) 196 continue; 197 if (ifa->ifa_addr->sa_family != AF_INET) 198 continue; 199 divsrc.sin_addr = 200 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 201 break; 202 } 203 } 204 /* 205 * Record the incoming interface name whenever we have one. 206 */ 207 if (m->m_pkthdr.rcvif) { 208 /* 209 * Hide the actual interface name in there in the 210 * sin_zero array. XXX This needs to be moved to a 211 * different sockaddr type for divert, e.g. 212 * sockaddr_div with multiple fields like 213 * sockaddr_dl. Presently we have only 7 bytes 214 * but that will do for now as most interfaces 215 * are 4 or less + 2 or less bytes for unit. 216 * There is probably a faster way of doing this, 217 * possibly taking it from the sockaddr_dl on the iface. 218 * This solves the problem of a P2P link and a LAN interface 219 * having the same address, which can result in the wrong 220 * interface being assigned to the packet when fed back 221 * into the divert socket. Theoretically if the daemon saves 222 * and re-uses the sockaddr_in as suggested in the man pages, 223 * this iface name will come along for the ride. 224 * (see div_output for the other half of this.) 225 */ 226 ksnprintf(divsrc.sin_zero, sizeof divsrc.sin_zero, "%s", 227 m->m_pkthdr.rcvif->if_xname); 228 } 229 230 /* Put packet on socket queue, if any */ 231 sa = NULL; 232 nport = htons((u_int16_t)port); 233 234 /* 235 * XXX 236 * Following loop to locate the inpcb is MPSAFE since the inpcb 237 * insertion/removal happens on the same CPU (CPU0), however, 238 * saving/testing the socket pointer is not MPSAFE. So we still 239 * need to hold BGL here. 240 */ 241 lwkt_gettoken(&div_token); 242 LIST_FOREACH(inp, &divcbinfo.pcblisthead, inp_list) { 243 if (inp->inp_flags & INP_PLACEMARKER) 244 continue; 245 if (inp->inp_lport == nport) 246 sa = inp->inp_socket; 247 } 248 if (sa) { 249 lwkt_gettoken(&sa->so_rcv.ssb_token); 250 if (ssb_appendaddr(&sa->so_rcv, (struct sockaddr *)&divsrc, m, NULL) == 0) 251 m_freem(m); 252 else 253 sorwakeup(sa); 254 lwkt_reltoken(&sa->so_rcv.ssb_token); 255 } else { 256 m_freem(m); 257 ipstat.ips_noproto++; 258 ipstat.ips_delivered--; 259 } 260 lwkt_reltoken(&div_token); 261 } 262 263 static void 264 div_packet_handler(netmsg_t msg) 265 { 266 struct mbuf *m; 267 int port, incoming = 0; 268 269 m = msg->packet.nm_packet; 270 271 port = msg->lmsg.u.ms_result32 & 0xffff; 272 if (msg->lmsg.u.ms_result32 & DIV_INPUT) 273 incoming = 1; 274 div_packet(m, incoming, port); 275 /* no reply, msg embedded in mbuf */ 276 } 277 278 static void 279 divert_packet(struct mbuf *m, int incoming) 280 { 281 struct m_tag *mtag; 282 struct divert_info *divinfo; 283 int port; 284 285 M_ASSERTPKTHDR(m); 286 287 /* Assure header */ 288 if (m->m_len < sizeof(struct ip) && 289 (m = m_pullup(m, sizeof(struct ip))) == NULL) 290 return; 291 292 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 293 KASSERT(mtag != NULL, ("%s no divert tag!", __func__)); 294 divinfo = m_tag_data(mtag); 295 296 port = divinfo->port; 297 KASSERT(port != 0, ("%s: port=0", __func__)); 298 299 if (mycpuid != 0) { 300 struct netmsg_packet *nmp; 301 302 nmp = &m->m_hdr.mh_netmsg; 303 netmsg_init(&nmp->base, NULL, &netisr_apanic_rport, 304 0, div_packet_handler); 305 nmp->nm_packet = m; 306 307 nmp->base.lmsg.u.ms_result32 = port; /* port is 16bits */ 308 if (incoming) 309 nmp->base.lmsg.u.ms_result32 |= DIV_INPUT; 310 else 311 nmp->base.lmsg.u.ms_result32 |= DIV_OUTPUT; 312 313 lwkt_sendmsg(netisr_cpuport(0), &nmp->base.lmsg); 314 } else { 315 div_packet(m, incoming, port); 316 } 317 } 318 319 /* 320 * Deliver packet back into the IP processing machinery. 321 * 322 * If no address specified, or address is 0.0.0.0, send to ip_output(); 323 * otherwise, send to ip_input() and mark as having been received on 324 * the interface with that address. 325 */ 326 static int 327 div_output(struct socket *so, struct mbuf *m, 328 struct sockaddr_in *sin, struct mbuf *control) 329 { 330 int error = 0; 331 struct m_tag *mtag; 332 struct divert_info *divinfo; 333 334 if (control) 335 m_freem(control); /* XXX */ 336 337 /* 338 * Prepare the tag for divert info. Note that a packet 339 * with a 0 tag in mh_data is effectively untagged, 340 * so we could optimize that case. 341 */ 342 mtag = m_tag_get(PACKET_TAG_IPFW_DIVERT, sizeof(*divinfo), MB_DONTWAIT); 343 if (mtag == NULL) { 344 error = ENOBUFS; 345 goto cantsend; 346 } 347 m_tag_prepend(m, mtag); 348 349 /* Loopback avoidance and state recovery */ 350 divinfo = m_tag_data(mtag); 351 if (sin) 352 divinfo->skipto = sin->sin_port; 353 else 354 divinfo->skipto = 0; 355 356 /* Reinject packet into the system as incoming or outgoing */ 357 if (DIV_IS_OUTPUT(sin)) { 358 struct ip *const ip = mtod(m, struct ip *); 359 360 /* Don't allow packet length sizes that will crash */ 361 if ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len) { 362 error = EINVAL; 363 goto cantsend; 364 } 365 366 /* Convert fields to host order for ip_output() */ 367 ip->ip_len = ntohs(ip->ip_len); 368 ip->ip_off = ntohs(ip->ip_off); 369 370 /* Send packet to output processing */ 371 ipstat.ips_rawout++; /* XXX */ 372 error = ip_output(m, NULL, NULL, 373 (so->so_options & SO_DONTROUTE) | 374 IP_ALLOWBROADCAST | IP_RAWOUTPUT, 375 NULL, NULL); 376 } else { 377 ip_input(m); 378 } 379 return error; 380 381 cantsend: 382 m_freem(m); 383 return error; 384 } 385 386 static void 387 div_attach(netmsg_t msg) 388 { 389 struct socket *so = msg->attach.base.nm_so; 390 int proto = msg->attach.nm_proto; 391 struct pru_attach_info *ai = msg->attach.nm_ai; 392 struct inpcb *inp; 393 int error; 394 395 inp = so->so_pcb; 396 if (inp) 397 panic("div_attach"); 398 error = priv_check_cred(ai->p_ucred, PRIV_ROOT, NULL_CRED_OKAY); 399 if (error) 400 goto out; 401 402 error = soreserve(so, div_sendspace, div_recvspace, ai->sb_rlimit); 403 if (error) 404 goto out; 405 lwkt_gettoken(&div_token); 406 sosetport(so, netisr_cpuport(0)); 407 error = in_pcballoc(so, &divcbinfo); 408 if (error) { 409 lwkt_reltoken(&div_token); 410 goto out; 411 } 412 inp = (struct inpcb *)so->so_pcb; 413 inp->inp_ip_p = proto; 414 inp->inp_vflag |= INP_IPV4; 415 inp->inp_flags |= INP_HDRINCL; 416 /* 417 * The socket is always "connected" because 418 * we always know "where" to send the packet. 419 */ 420 sosetstate(so, SS_ISCONNECTED); 421 lwkt_reltoken(&div_token); 422 error = 0; 423 out: 424 lwkt_replymsg(&msg->attach.base.lmsg, error); 425 } 426 427 static void 428 div_detach(netmsg_t msg) 429 { 430 struct socket *so = msg->detach.base.nm_so; 431 struct inpcb *inp; 432 433 inp = so->so_pcb; 434 if (inp == NULL) 435 panic("div_detach"); 436 in_pcbdetach(inp); 437 lwkt_replymsg(&msg->detach.base.lmsg, 0); 438 } 439 440 /* 441 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 442 * will sofree() it when we return. 443 */ 444 static void 445 div_abort(netmsg_t msg) 446 { 447 struct socket *so = msg->abort.base.nm_so; 448 449 soisdisconnected(so); 450 div_detach(msg); 451 /* msg invalid now */ 452 } 453 454 static void 455 div_disconnect(netmsg_t msg) 456 { 457 struct socket *so = msg->disconnect.base.nm_so; 458 int error; 459 460 if (so->so_state & SS_ISCONNECTED) { 461 soreference(so); 462 div_abort(msg); 463 /* msg invalid now */ 464 sofree(so); 465 return; 466 } 467 error = ENOTCONN; 468 lwkt_replymsg(&msg->disconnect.base.lmsg, error); 469 } 470 471 static void 472 div_bind(netmsg_t msg) 473 { 474 struct socket *so = msg->bind.base.nm_so; 475 struct sockaddr *nam = msg->bind.nm_nam; 476 int error; 477 478 /* 479 * in_pcbbind assumes that nam is a sockaddr_in 480 * and in_pcbbind requires a valid address. Since divert 481 * sockets don't we need to make sure the address is 482 * filled in properly. 483 * XXX -- divert should not be abusing in_pcbind 484 * and should probably have its own family. 485 */ 486 if (nam->sa_family != AF_INET) { 487 error = EAFNOSUPPORT; 488 } else { 489 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 490 error = in_pcbbind(so->so_pcb, nam, msg->bind.nm_td); 491 } 492 lwkt_replymsg(&msg->bind.base.lmsg, error); 493 } 494 495 static void 496 div_shutdown(netmsg_t msg) 497 { 498 struct socket *so = msg->shutdown.base.nm_so; 499 500 socantsendmore(so); 501 502 lwkt_replymsg(&msg->shutdown.base.lmsg, 0); 503 } 504 505 static void 506 div_send(netmsg_t msg) 507 { 508 struct socket *so = msg->send.base.nm_so; 509 struct mbuf *m = msg->send.nm_m; 510 struct sockaddr *nam = msg->send.nm_addr; 511 struct mbuf *control = msg->send.nm_control; 512 int error; 513 514 /* Length check already done in ip_cpufn() */ 515 KASSERT(m->m_len >= sizeof(struct ip), ("IP header not in one mbuf")); 516 517 /* Send packet */ 518 error = div_output(so, m, (struct sockaddr_in *)nam, control); 519 lwkt_replymsg(&msg->send.base.lmsg, error); 520 } 521 522 SYSCTL_DECL(_net_inet_divert); 523 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, &divcbinfo, 0, 524 in_pcblist_global, "S,xinpcb", "List of active divert sockets"); 525 526 struct pr_usrreqs div_usrreqs = { 527 .pru_abort = div_abort, 528 .pru_accept = pr_generic_notsupp, 529 .pru_attach = div_attach, 530 .pru_bind = div_bind, 531 .pru_connect = pr_generic_notsupp, 532 .pru_connect2 = pr_generic_notsupp, 533 .pru_control = in_control_dispatch, 534 .pru_detach = div_detach, 535 .pru_disconnect = div_disconnect, 536 .pru_listen = pr_generic_notsupp, 537 .pru_peeraddr = in_setpeeraddr_dispatch, 538 .pru_rcvd = pr_generic_notsupp, 539 .pru_rcvoob = pr_generic_notsupp, 540 .pru_send = div_send, 541 .pru_sense = pru_sense_null, 542 .pru_shutdown = div_shutdown, 543 .pru_sockaddr = in_setsockaddr_dispatch, 544 .pru_sosend = sosend, 545 .pru_soreceive = soreceive 546 }; 547 548 static struct mbuf * 549 ip_divert_out(struct mbuf *m, int tee) 550 { 551 struct mbuf *clone = NULL; 552 struct ip *ip = mtod(m, struct ip *); 553 554 /* Clone packet if we're doing a 'tee' */ 555 if (tee) 556 clone = m_dup(m, MB_DONTWAIT); 557 558 /* 559 * XXX 560 * delayed checksums are not currently compatible 561 * with divert sockets. 562 */ 563 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 564 in_delayed_cksum(m); 565 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 566 } 567 568 /* Restore packet header fields to original values */ 569 ip->ip_len = htons(ip->ip_len); 570 ip->ip_off = htons(ip->ip_off); 571 572 /* Deliver packet to divert input routine */ 573 divert_packet(m, 0); 574 575 /* If 'tee', continue with original packet */ 576 return clone; 577 } 578 579 static struct mbuf * 580 ip_divert_in(struct mbuf *m, int tee) 581 { 582 struct mbuf *clone = NULL; 583 struct ip *ip = mtod(m, struct ip *); 584 struct m_tag *mtag; 585 586 if (ip->ip_off & (IP_MF | IP_OFFMASK)) { 587 const struct divert_info *divinfo; 588 u_short frag_off; 589 int hlen; 590 591 /* 592 * Only trust divert info in the fragment 593 * at offset 0. 594 */ 595 frag_off = ip->ip_off << 3; 596 if (frag_off != 0) { 597 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 598 m_tag_delete(m, mtag); 599 } 600 601 /* 602 * Attempt reassembly; if it succeeds, proceed. 603 * ip_reass() will return a different mbuf. 604 */ 605 m = ip_reass(m); 606 if (m == NULL) 607 return NULL; 608 ip = mtod(m, struct ip *); 609 610 /* Caller need to redispatch the packet, if it is for us */ 611 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; 612 613 /* 614 * Get the header length of the reassembled 615 * packet 616 */ 617 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 618 619 /* 620 * Restore original checksum before diverting 621 * packet 622 */ 623 ip->ip_len += hlen; 624 ip->ip_len = htons(ip->ip_len); 625 ip->ip_off = htons(ip->ip_off); 626 ip->ip_sum = 0; 627 if (hlen == sizeof(struct ip)) 628 ip->ip_sum = in_cksum_hdr(ip); 629 else 630 ip->ip_sum = in_cksum(m, hlen); 631 ip->ip_off = ntohs(ip->ip_off); 632 ip->ip_len = ntohs(ip->ip_len); 633 634 /* 635 * Only use the saved divert info 636 */ 637 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 638 if (mtag == NULL) { 639 /* Wrongly configured ipfw */ 640 kprintf("ip_input no divert info\n"); 641 m_freem(m); 642 return NULL; 643 } 644 divinfo = m_tag_data(mtag); 645 tee = divinfo->tee; 646 } 647 648 /* 649 * Divert or tee packet to the divert protocol if 650 * required. 651 */ 652 653 /* Clone packet if we're doing a 'tee' */ 654 if (tee) 655 clone = m_dup(m, MB_DONTWAIT); 656 657 /* 658 * Restore packet header fields to original 659 * values 660 */ 661 ip->ip_len = htons(ip->ip_len); 662 ip->ip_off = htons(ip->ip_off); 663 664 /* Deliver packet to divert input routine */ 665 divert_packet(m, 1); 666 667 /* Catch invalid reference */ 668 m = NULL; 669 ip = NULL; 670 671 ipstat.ips_delivered++; 672 673 /* If 'tee', continue with original packet */ 674 if (clone != NULL) { 675 /* 676 * Complete processing of the packet. 677 * XXX Better safe than sorry, remove the DIVERT tag. 678 */ 679 mtag = m_tag_find(clone, PACKET_TAG_IPFW_DIVERT, NULL); 680 KKASSERT(mtag != NULL); 681 m_tag_delete(clone, mtag); 682 } 683 return clone; 684 } 685 686 static struct mbuf * 687 ip_divert(struct mbuf *m, int tee, int incoming) 688 { 689 struct mbuf *ret; 690 691 if (incoming) 692 ret = ip_divert_in(m, tee); 693 else 694 ret = ip_divert_out(m, tee); 695 return ret; 696 } 697