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 <sys/thread2.h> 67 #include <sys/mplock2.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_systm.h> 71 #include <netinet/ip.h> 72 #include <netinet/in_pcb.h> 73 #include <netinet/in_var.h> 74 #include <netinet/ip_var.h> 75 #include <netinet/ip_divert.h> 76 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 #define DIV_IS_OUTPUT(sin) ((sin) == NULL || (sin)->sin_addr.s_addr == 0) 88 89 #define DIV_OUTPUT 0x10000 90 #define DIV_INPUT 0x20000 91 92 /* 93 * Divert sockets work in conjunction with ipfw, see the divert(4) 94 * manpage for features. 95 * Internally, packets selected by ipfw in ip_input() or ip_output(), 96 * and never diverted before, are passed to the input queue of the 97 * divert socket with a given 'divert_port' number (as specified in 98 * the matching ipfw rule), and they are tagged with a 16 bit cookie 99 * (representing the rule number of the matching ipfw rule), which 100 * is passed to process reading from the socket. 101 * 102 * Packets written to the divert socket are again tagged with a cookie 103 * (usually the same as above) and a destination address. 104 * If the destination address is INADDR_ANY then the packet is 105 * treated as outgoing and sent to ip_output(), otherwise it is 106 * treated as incoming and sent to ip_input(). 107 * In both cases, the packet is tagged with the cookie. 108 * 109 * On reinjection, processing in ip_input() and ip_output() 110 * will be exactly the same as for the original packet, except that 111 * ipfw processing will start at the rule number after the one 112 * written in the cookie (so, tagging a packet with a cookie of 0 113 * will cause it to be effectively considered as a standard packet). 114 */ 115 116 /* Internal variables */ 117 static struct inpcbinfo divcbinfo; 118 119 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 120 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 121 122 static struct mbuf *ip_divert(struct mbuf *, int, int); 123 124 static struct lwkt_token div_token = LWKT_TOKEN_INITIALIZER(div_token); 125 126 /* 127 * Initialize divert connection block queue. 128 */ 129 void 130 div_init(void) 131 { 132 in_pcbinfo_init(&divcbinfo); 133 /* 134 * XXX We don't use the hash list for divert IP, but it's easier 135 * to allocate a one entry hash list than it is to check all 136 * over the place for hashbase == NULL. 137 */ 138 divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask); 139 divcbinfo.porthashbase = hashinit(1, M_PCB, &divcbinfo.porthashmask); 140 divcbinfo.wildcardhashbase = hashinit(1, M_PCB, 141 &divcbinfo.wildcardhashmask); 142 divcbinfo.ipi_size = sizeof(struct inpcb); 143 ip_divert_p = ip_divert; 144 } 145 146 /* 147 * IPPROTO_DIVERT is not a real IP protocol; don't allow any packets 148 * with that protocol number to enter the system from the outside. 149 */ 150 int 151 div_input(struct mbuf **mp, int *offp, int proto) 152 { 153 struct mbuf *m = *mp; 154 155 ipstat.ips_noproto++; 156 m_freem(m); 157 return(IPPROTO_DONE); 158 } 159 160 /* 161 * Divert a packet by passing it up to the divert socket at port 'port'. 162 * 163 * Setup generic address and protocol structures for div_input routine, 164 * then pass them along with mbuf chain. 165 */ 166 static void 167 div_packet(struct mbuf *m, int incoming, int port) 168 { 169 struct sockaddr_in divsrc = { sizeof divsrc, AF_INET }; 170 struct inpcb *inp; 171 struct socket *sa; 172 struct m_tag *mtag; 173 struct divert_info *divinfo; 174 u_int16_t nport; 175 176 /* Locate the divert info */ 177 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 178 divinfo = m_tag_data(mtag); 179 divsrc.sin_port = divinfo->skipto; 180 181 /* 182 * Record receive interface address, if any. 183 * But only for incoming packets. 184 */ 185 divsrc.sin_addr.s_addr = 0; 186 if (incoming) { 187 struct ifaddr_container *ifac; 188 189 /* Find IP address for receive interface */ 190 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid], 191 ifa_link) { 192 struct ifaddr *ifa = ifac->ifa; 193 194 if (ifa->ifa_addr == NULL) 195 continue; 196 if (ifa->ifa_addr->sa_family != AF_INET) 197 continue; 198 divsrc.sin_addr = 199 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 200 break; 201 } 202 } 203 /* 204 * Record the incoming interface name whenever we have one. 205 */ 206 if (m->m_pkthdr.rcvif) { 207 /* 208 * Hide the actual interface name in there in the 209 * sin_zero array. XXX This needs to be moved to a 210 * different sockaddr type for divert, e.g. 211 * sockaddr_div with multiple fields like 212 * sockaddr_dl. Presently we have only 7 bytes 213 * but that will do for now as most interfaces 214 * are 4 or less + 2 or less bytes for unit. 215 * There is probably a faster way of doing this, 216 * possibly taking it from the sockaddr_dl on the iface. 217 * This solves the problem of a P2P link and a LAN interface 218 * having the same address, which can result in the wrong 219 * interface being assigned to the packet when fed back 220 * into the divert socket. Theoretically if the daemon saves 221 * and re-uses the sockaddr_in as suggested in the man pages, 222 * this iface name will come along for the ride. 223 * (see div_output for the other half of this.) 224 */ 225 ksnprintf(divsrc.sin_zero, sizeof divsrc.sin_zero, "%s", 226 m->m_pkthdr.rcvif->if_xname); 227 } 228 229 /* Put packet on socket queue, if any */ 230 sa = NULL; 231 nport = htons((u_int16_t)port); 232 233 /* 234 * XXX 235 * Following loop to locate the inpcb is MPSAFE since the inpcb 236 * insertion/removal happens on the same CPU (CPU0), however, 237 * saving/testing the socket pointer is not MPSAFE. So we still 238 * need to hold BGL here. 239 */ 240 lwkt_gettoken(&div_token); 241 LIST_FOREACH(inp, &divcbinfo.pcblisthead, inp_list) { 242 if (inp->inp_flags & INP_PLACEMARKER) 243 continue; 244 if (inp->inp_lport == nport) 245 sa = inp->inp_socket; 246 } 247 if (sa) { 248 lwkt_gettoken(&sa->so_rcv.ssb_token); 249 if (ssb_appendaddr(&sa->so_rcv, (struct sockaddr *)&divsrc, m, NULL) == 0) 250 m_freem(m); 251 else 252 sorwakeup(sa); 253 lwkt_reltoken(&sa->so_rcv.ssb_token); 254 } else { 255 m_freem(m); 256 ipstat.ips_noproto++; 257 ipstat.ips_delivered--; 258 } 259 lwkt_reltoken(&div_token); 260 } 261 262 #ifdef SMP 263 264 static void 265 div_packet_handler(netmsg_t msg) 266 { 267 struct mbuf *m; 268 int port, incoming = 0; 269 270 m = msg->packet.nm_packet; 271 272 port = msg->lmsg.u.ms_result32 & 0xffff; 273 if (msg->lmsg.u.ms_result32 & DIV_INPUT) 274 incoming = 1; 275 div_packet(m, incoming, port); 276 /* no reply, msg embedded in mbuf */ 277 } 278 279 #endif /* SMP */ 280 281 static void 282 divert_packet(struct mbuf *m, int incoming) 283 { 284 struct m_tag *mtag; 285 struct divert_info *divinfo; 286 int port; 287 288 M_ASSERTPKTHDR(m); 289 290 /* Assure header */ 291 if (m->m_len < sizeof(struct ip) && 292 (m = m_pullup(m, sizeof(struct ip))) == NULL) 293 return; 294 295 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 296 KASSERT(mtag != NULL, ("%s no divert tag!", __func__)); 297 divinfo = m_tag_data(mtag); 298 299 port = divinfo->port; 300 KASSERT(port != 0, ("%s: port=0", __func__)); 301 302 #ifdef SMP 303 if (mycpuid != 0) { 304 struct netmsg_packet *nmp; 305 306 nmp = &m->m_hdr.mh_netmsg; 307 netmsg_init(&nmp->base, NULL, &netisr_apanic_rport, 308 0, div_packet_handler); 309 nmp->nm_packet = m; 310 311 nmp->base.lmsg.u.ms_result32 = port; /* port is 16bits */ 312 if (incoming) 313 nmp->base.lmsg.u.ms_result32 |= DIV_INPUT; 314 else 315 nmp->base.lmsg.u.ms_result32 |= DIV_OUTPUT; 316 317 lwkt_sendmsg(cpu_portfn(0), &nmp->base.lmsg); 318 } else { 319 div_packet(m, incoming, port); 320 } 321 #else 322 div_packet(m, incoming, port); 323 #endif 324 } 325 326 /* 327 * Deliver packet back into the IP processing machinery. 328 * 329 * If no address specified, or address is 0.0.0.0, send to ip_output(); 330 * otherwise, send to ip_input() and mark as having been received on 331 * the interface with that address. 332 */ 333 static int 334 div_output(struct socket *so, struct mbuf *m, 335 struct sockaddr_in *sin, struct mbuf *control) 336 { 337 int error = 0; 338 struct m_tag *mtag; 339 struct divert_info *divinfo; 340 341 if (control) 342 m_freem(control); /* XXX */ 343 344 /* 345 * Prepare the tag for divert info. Note that a packet 346 * with a 0 tag in mh_data is effectively untagged, 347 * so we could optimize that case. 348 */ 349 mtag = m_tag_get(PACKET_TAG_IPFW_DIVERT, sizeof(*divinfo), MB_DONTWAIT); 350 if (mtag == NULL) { 351 error = ENOBUFS; 352 goto cantsend; 353 } 354 m_tag_prepend(m, mtag); 355 356 /* Loopback avoidance and state recovery */ 357 divinfo = m_tag_data(mtag); 358 if (sin) 359 divinfo->skipto = sin->sin_port; 360 else 361 divinfo->skipto = 0; 362 363 /* Reinject packet into the system as incoming or outgoing */ 364 if (DIV_IS_OUTPUT(sin)) { 365 struct ip *const ip = mtod(m, struct ip *); 366 367 /* Don't allow packet length sizes that will crash */ 368 if ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len) { 369 error = EINVAL; 370 goto cantsend; 371 } 372 373 /* Convert fields to host order for ip_output() */ 374 ip->ip_len = ntohs(ip->ip_len); 375 ip->ip_off = ntohs(ip->ip_off); 376 377 /* Send packet to output processing */ 378 ipstat.ips_rawout++; /* XXX */ 379 error = ip_output(m, NULL, NULL, 380 (so->so_options & SO_DONTROUTE) | 381 IP_ALLOWBROADCAST | IP_RAWOUTPUT, 382 NULL, NULL); 383 } else { 384 ip_input(m); 385 } 386 return error; 387 388 cantsend: 389 m_freem(m); 390 return error; 391 } 392 393 static void 394 div_attach(netmsg_t msg) 395 { 396 struct socket *so = msg->attach.base.nm_so; 397 int proto = msg->attach.nm_proto; 398 struct pru_attach_info *ai = msg->attach.nm_ai; 399 struct inpcb *inp; 400 int error; 401 402 inp = so->so_pcb; 403 if (inp) 404 panic("div_attach"); 405 error = priv_check_cred(ai->p_ucred, PRIV_ROOT, NULL_CRED_OKAY); 406 if (error) 407 goto out; 408 409 error = soreserve(so, div_sendspace, div_recvspace, ai->sb_rlimit); 410 if (error) 411 goto out; 412 lwkt_gettoken(&div_token); 413 sosetport(so, cpu_portfn(0)); 414 error = in_pcballoc(so, &divcbinfo); 415 if (error) { 416 lwkt_reltoken(&div_token); 417 goto out; 418 } 419 inp = (struct inpcb *)so->so_pcb; 420 inp->inp_ip_p = proto; 421 inp->inp_vflag |= INP_IPV4; 422 inp->inp_flags |= INP_HDRINCL; 423 /* 424 * The socket is always "connected" because 425 * we always know "where" to send the packet. 426 */ 427 sosetstate(so, SS_ISCONNECTED); 428 lwkt_reltoken(&div_token); 429 error = 0; 430 out: 431 lwkt_replymsg(&msg->attach.base.lmsg, error); 432 } 433 434 static void 435 div_detach(netmsg_t msg) 436 { 437 struct socket *so = msg->detach.base.nm_so; 438 struct inpcb *inp; 439 440 inp = so->so_pcb; 441 if (inp == NULL) 442 panic("div_detach"); 443 in_pcbdetach(inp); 444 lwkt_replymsg(&msg->detach.base.lmsg, 0); 445 } 446 447 /* 448 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 449 * will sofree() it when we return. 450 */ 451 static void 452 div_abort(netmsg_t msg) 453 { 454 struct socket *so = msg->abort.base.nm_so; 455 456 soisdisconnected(so); 457 div_detach(msg); 458 /* msg invalid now */ 459 } 460 461 static void 462 div_disconnect(netmsg_t msg) 463 { 464 struct socket *so = msg->disconnect.base.nm_so; 465 int error; 466 467 if (so->so_state & SS_ISCONNECTED) { 468 soreference(so); 469 div_abort(msg); 470 /* msg invalid now */ 471 sofree(so); 472 return; 473 } 474 error = ENOTCONN; 475 lwkt_replymsg(&msg->disconnect.base.lmsg, error); 476 } 477 478 static void 479 div_bind(netmsg_t msg) 480 { 481 struct socket *so = msg->bind.base.nm_so; 482 struct sockaddr *nam = msg->bind.nm_nam; 483 int error; 484 485 /* 486 * in_pcbbind assumes that nam is a sockaddr_in 487 * and in_pcbbind requires a valid address. Since divert 488 * sockets don't we need to make sure the address is 489 * filled in properly. 490 * XXX -- divert should not be abusing in_pcbind 491 * and should probably have its own family. 492 */ 493 if (nam->sa_family != AF_INET) { 494 error = EAFNOSUPPORT; 495 } else { 496 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 497 error = in_pcbbind(so->so_pcb, nam, msg->bind.nm_td); 498 } 499 lwkt_replymsg(&msg->bind.base.lmsg, error); 500 } 501 502 static void 503 div_shutdown(netmsg_t msg) 504 { 505 struct socket *so = msg->shutdown.base.nm_so; 506 507 socantsendmore(so); 508 509 lwkt_replymsg(&msg->shutdown.base.lmsg, 0); 510 } 511 512 static void 513 div_send(netmsg_t msg) 514 { 515 struct socket *so = msg->send.base.nm_so; 516 struct mbuf *m = msg->send.nm_m; 517 struct sockaddr *nam = msg->send.nm_addr; 518 struct mbuf *control = msg->send.nm_control; 519 int error; 520 521 /* Length check already done in ip_cpufn() */ 522 KASSERT(m->m_len >= sizeof(struct ip), ("IP header not in one mbuf")); 523 524 /* Send packet */ 525 error = div_output(so, m, (struct sockaddr_in *)nam, control); 526 lwkt_replymsg(&msg->send.base.lmsg, error); 527 } 528 529 SYSCTL_DECL(_net_inet_divert); 530 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, &divcbinfo, 0, 531 in_pcblist_global, "S,xinpcb", "List of active divert sockets"); 532 533 struct pr_usrreqs div_usrreqs = { 534 .pru_abort = div_abort, 535 .pru_accept = pr_generic_notsupp, 536 .pru_attach = div_attach, 537 .pru_bind = div_bind, 538 .pru_connect = pr_generic_notsupp, 539 .pru_connect2 = pr_generic_notsupp, 540 .pru_control = in_control_dispatch, 541 .pru_detach = div_detach, 542 .pru_disconnect = div_disconnect, 543 .pru_listen = pr_generic_notsupp, 544 .pru_peeraddr = in_setpeeraddr_dispatch, 545 .pru_rcvd = pr_generic_notsupp, 546 .pru_rcvoob = pr_generic_notsupp, 547 .pru_send = div_send, 548 .pru_sense = pru_sense_null, 549 .pru_shutdown = div_shutdown, 550 .pru_sockaddr = in_setsockaddr_dispatch, 551 .pru_sosend = sosend, 552 .pru_soreceive = soreceive 553 }; 554 555 static struct mbuf * 556 ip_divert_out(struct mbuf *m, int tee) 557 { 558 struct mbuf *clone = NULL; 559 struct ip *ip = mtod(m, struct ip *); 560 561 /* Clone packet if we're doing a 'tee' */ 562 if (tee) 563 clone = m_dup(m, MB_DONTWAIT); 564 565 /* 566 * XXX 567 * delayed checksums are not currently compatible 568 * with divert sockets. 569 */ 570 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 571 in_delayed_cksum(m); 572 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 573 } 574 575 /* Restore packet header fields to original values */ 576 ip->ip_len = htons(ip->ip_len); 577 ip->ip_off = htons(ip->ip_off); 578 579 /* Deliver packet to divert input routine */ 580 divert_packet(m, 0); 581 582 /* If 'tee', continue with original packet */ 583 return clone; 584 } 585 586 static struct mbuf * 587 ip_divert_in(struct mbuf *m, int tee) 588 { 589 struct mbuf *clone = NULL; 590 struct ip *ip = mtod(m, struct ip *); 591 struct m_tag *mtag; 592 593 if (ip->ip_off & (IP_MF | IP_OFFMASK)) { 594 const struct divert_info *divinfo; 595 u_short frag_off; 596 int hlen; 597 598 /* 599 * Only trust divert info in the fragment 600 * at offset 0. 601 */ 602 frag_off = ip->ip_off << 3; 603 if (frag_off != 0) { 604 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 605 m_tag_delete(m, mtag); 606 } 607 608 /* 609 * Attempt reassembly; if it succeeds, proceed. 610 * ip_reass() will return a different mbuf. 611 */ 612 m = ip_reass(m); 613 if (m == NULL) 614 return NULL; 615 ip = mtod(m, struct ip *); 616 617 /* Caller need to redispatch the packet, if it is for us */ 618 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; 619 620 /* 621 * Get the header length of the reassembled 622 * packet 623 */ 624 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 625 626 /* 627 * Restore original checksum before diverting 628 * packet 629 */ 630 ip->ip_len += hlen; 631 ip->ip_len = htons(ip->ip_len); 632 ip->ip_off = htons(ip->ip_off); 633 ip->ip_sum = 0; 634 if (hlen == sizeof(struct ip)) 635 ip->ip_sum = in_cksum_hdr(ip); 636 else 637 ip->ip_sum = in_cksum(m, hlen); 638 ip->ip_off = ntohs(ip->ip_off); 639 ip->ip_len = ntohs(ip->ip_len); 640 641 /* 642 * Only use the saved divert info 643 */ 644 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 645 if (mtag == NULL) { 646 /* Wrongly configured ipfw */ 647 kprintf("ip_input no divert info\n"); 648 m_freem(m); 649 return NULL; 650 } 651 divinfo = m_tag_data(mtag); 652 tee = divinfo->tee; 653 } 654 655 /* 656 * Divert or tee packet to the divert protocol if 657 * required. 658 */ 659 660 /* Clone packet if we're doing a 'tee' */ 661 if (tee) 662 clone = m_dup(m, MB_DONTWAIT); 663 664 /* 665 * Restore packet header fields to original 666 * values 667 */ 668 ip->ip_len = htons(ip->ip_len); 669 ip->ip_off = htons(ip->ip_off); 670 671 /* Deliver packet to divert input routine */ 672 divert_packet(m, 1); 673 674 /* Catch invalid reference */ 675 m = NULL; 676 ip = NULL; 677 678 ipstat.ips_delivered++; 679 680 /* If 'tee', continue with original packet */ 681 if (clone != NULL) { 682 /* 683 * Complete processing of the packet. 684 * XXX Better safe than sorry, remove the DIVERT tag. 685 */ 686 mtag = m_tag_find(clone, PACKET_TAG_IPFW_DIVERT, NULL); 687 KKASSERT(mtag != NULL); 688 m_tag_delete(clone, mtag); 689 } 690 return clone; 691 } 692 693 static struct mbuf * 694 ip_divert(struct mbuf *m, int tee, int incoming) 695 { 696 struct mbuf *ret; 697 698 if (incoming) 699 ret = ip_divert_in(m, tee); 700 else 701 ret = ip_divert_out(m, tee); 702 return ret; 703 } 704