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/socketvar2.h> 56 #include <sys/sysctl.h> 57 #include <sys/systm.h> 58 #include <sys/proc.h> 59 #include <sys/priv.h> 60 #include <sys/in_cksum.h> 61 #include <sys/lock.h> 62 #include <sys/msgport.h> 63 64 #include <net/if.h> 65 #include <net/route.h> 66 67 #include <net/netmsg2.h> 68 #include <sys/thread2.h> 69 #include <sys/mplock2.h> 70 71 #include <netinet/in.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/ip.h> 74 #include <netinet/in_pcb.h> 75 #include <netinet/in_var.h> 76 #include <netinet/ip_var.h> 77 #include <netinet/ip_divert.h> 78 79 /* 80 * Divert sockets 81 */ 82 83 /* 84 * Allocate enough space to hold a full IP packet 85 */ 86 #define DIVSNDQ (65536 + 100) 87 #define DIVRCVQ (65536 + 100) 88 89 #define DIV_IS_OUTPUT(sin) ((sin) == NULL || (sin)->sin_addr.s_addr == 0) 90 91 #define DIV_OUTPUT 0x10000 92 #define DIV_INPUT 0x20000 93 94 /* 95 * Divert sockets work in conjunction with ipfw, see the divert(4) 96 * manpage for features. 97 * Internally, packets selected by ipfw in ip_input() or ip_output(), 98 * and never diverted before, are passed to the input queue of the 99 * divert socket with a given 'divert_port' number (as specified in 100 * the matching ipfw rule), and they are tagged with a 16 bit cookie 101 * (representing the rule number of the matching ipfw rule), which 102 * is passed to process reading from the socket. 103 * 104 * Packets written to the divert socket are again tagged with a cookie 105 * (usually the same as above) and a destination address. 106 * If the destination address is INADDR_ANY then the packet is 107 * treated as outgoing and sent to ip_output(), otherwise it is 108 * treated as incoming and sent to ip_input(). 109 * In both cases, the packet is tagged with the cookie. 110 * 111 * On reinjection, processing in ip_input() and ip_output() 112 * will be exactly the same as for the original packet, except that 113 * ipfw processing will start at the rule number after the one 114 * written in the cookie (so, tagging a packet with a cookie of 0 115 * will cause it to be effectively considered as a standard packet). 116 */ 117 118 /* Internal variables */ 119 static struct inpcbinfo divcbinfo; 120 121 static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 122 static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 123 124 static struct mbuf *ip_divert(struct mbuf *, int, int); 125 126 static struct lwkt_token div_token = LWKT_TOKEN_MP_INITIALIZER(div_token); 127 128 /* 129 * Initialize divert connection block queue. 130 */ 131 void 132 div_init(void) 133 { 134 in_pcbinfo_init(&divcbinfo); 135 /* 136 * XXX We don't use the hash list for divert IP, but it's easier 137 * to allocate a one entry hash list than it is to check all 138 * over the place for hashbase == NULL. 139 */ 140 divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask); 141 divcbinfo.porthashbase = hashinit(1, M_PCB, &divcbinfo.porthashmask); 142 divcbinfo.wildcardhashbase = hashinit(1, M_PCB, 143 &divcbinfo.wildcardhashmask); 144 divcbinfo.ipi_size = sizeof(struct inpcb); 145 ip_divert_p = ip_divert; 146 } 147 148 /* 149 * IPPROTO_DIVERT is not a real IP protocol; don't allow any packets 150 * with that protocol number to enter the system from the outside. 151 */ 152 int 153 div_input(struct mbuf **mp, int *offp, int proto) 154 { 155 struct mbuf *m = *mp; 156 157 ipstat.ips_noproto++; 158 m_freem(m); 159 return(IPPROTO_DONE); 160 } 161 162 /* 163 * Divert a packet by passing it up to the divert socket at port 'port'. 164 * 165 * Setup generic address and protocol structures for div_input routine, 166 * then pass them along with mbuf chain. 167 */ 168 static void 169 div_packet(struct mbuf *m, int incoming, int port) 170 { 171 struct sockaddr_in divsrc = { sizeof divsrc, AF_INET }; 172 struct inpcb *inp; 173 struct socket *sa; 174 struct m_tag *mtag; 175 struct divert_info *divinfo; 176 u_int16_t nport; 177 178 /* Locate the divert info */ 179 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 180 divinfo = m_tag_data(mtag); 181 divsrc.sin_port = divinfo->skipto; 182 183 /* 184 * Record receive interface address, if any. 185 * But only for incoming packets. 186 */ 187 divsrc.sin_addr.s_addr = 0; 188 if (incoming) { 189 struct ifaddr_container *ifac; 190 191 /* Find IP address for receive interface */ 192 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid], 193 ifa_link) { 194 struct ifaddr *ifa = ifac->ifa; 195 196 if (ifa->ifa_addr == NULL) 197 continue; 198 if (ifa->ifa_addr->sa_family != AF_INET) 199 continue; 200 divsrc.sin_addr = 201 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 202 break; 203 } 204 } 205 /* 206 * Record the incoming interface name whenever we have one. 207 */ 208 if (m->m_pkthdr.rcvif) { 209 /* 210 * Hide the actual interface name in there in the 211 * sin_zero array. XXX This needs to be moved to a 212 * different sockaddr type for divert, e.g. 213 * sockaddr_div with multiple fields like 214 * sockaddr_dl. Presently we have only 7 bytes 215 * but that will do for now as most interfaces 216 * are 4 or less + 2 or less bytes for unit. 217 * There is probably a faster way of doing this, 218 * possibly taking it from the sockaddr_dl on the iface. 219 * This solves the problem of a P2P link and a LAN interface 220 * having the same address, which can result in the wrong 221 * interface being assigned to the packet when fed back 222 * into the divert socket. Theoretically if the daemon saves 223 * and re-uses the sockaddr_in as suggested in the man pages, 224 * this iface name will come along for the ride. 225 * (see div_output for the other half of this.) 226 */ 227 ksnprintf(divsrc.sin_zero, sizeof divsrc.sin_zero, 228 m->m_pkthdr.rcvif->if_xname); 229 } 230 231 /* Put packet on socket queue, if any */ 232 sa = NULL; 233 nport = htons((u_int16_t)port); 234 235 /* 236 * XXX 237 * Following loop to locate the inpcb is MPSAFE since the inpcb 238 * insertion/removal happens on the same CPU (CPU0), however, 239 * saving/testing the socket pointer is not MPSAFE. So we still 240 * need to hold BGL here. 241 */ 242 lwkt_gettoken(&div_token); 243 LIST_FOREACH(inp, &divcbinfo.pcblisthead, inp_list) { 244 if (inp->inp_flags & INP_PLACEMARKER) 245 continue; 246 if (inp->inp_lport == nport) 247 sa = inp->inp_socket; 248 } 249 if (sa) { 250 lwkt_gettoken(&sa->so_rcv.ssb_token); 251 if (ssb_appendaddr(&sa->so_rcv, (struct sockaddr *)&divsrc, m, NULL) == 0) 252 m_freem(m); 253 else 254 sorwakeup(sa); 255 lwkt_reltoken(&sa->so_rcv.ssb_token); 256 } else { 257 m_freem(m); 258 ipstat.ips_noproto++; 259 ipstat.ips_delivered--; 260 } 261 lwkt_reltoken(&div_token); 262 } 263 264 #ifdef SMP 265 266 static void 267 div_packet_handler(netmsg_t msg) 268 { 269 struct mbuf *m; 270 int port, incoming = 0; 271 272 m = msg->packet.nm_packet; 273 274 port = msg->lmsg.u.ms_result32 & 0xffff; 275 if (msg->lmsg.u.ms_result32 & DIV_INPUT) 276 incoming = 1; 277 div_packet(m, incoming, port); 278 /* no reply, msg embedded in mbuf */ 279 } 280 281 #endif /* SMP */ 282 283 static void 284 divert_packet(struct mbuf *m, int incoming) 285 { 286 struct m_tag *mtag; 287 struct divert_info *divinfo; 288 int port; 289 290 M_ASSERTPKTHDR(m); 291 292 /* Assure header */ 293 if (m->m_len < sizeof(struct ip) && 294 (m = m_pullup(m, sizeof(struct ip))) == NULL) 295 return; 296 297 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 298 KASSERT(mtag != NULL, ("%s no divert tag!", __func__)); 299 divinfo = m_tag_data(mtag); 300 301 port = divinfo->port; 302 KASSERT(port != 0, ("%s: port=0", __func__)); 303 304 #ifdef SMP 305 if (mycpuid != 0) { 306 struct netmsg_packet *nmp; 307 308 nmp = &m->m_hdr.mh_netmsg; 309 netmsg_init(&nmp->base, NULL, &netisr_apanic_rport, 310 0, div_packet_handler); 311 nmp->nm_packet = m; 312 313 nmp->base.lmsg.u.ms_result32 = port; /* port is 16bits */ 314 if (incoming) 315 nmp->base.lmsg.u.ms_result32 |= DIV_INPUT; 316 else 317 nmp->base.lmsg.u.ms_result32 |= DIV_OUTPUT; 318 319 lwkt_sendmsg(cpu_portfn(0), &nmp->base.lmsg); 320 } else { 321 div_packet(m, incoming, port); 322 } 323 #else 324 div_packet(m, incoming, port); 325 #endif 326 } 327 328 /* 329 * Deliver packet back into the IP processing machinery. 330 * 331 * If no address specified, or address is 0.0.0.0, send to ip_output(); 332 * otherwise, send to ip_input() and mark as having been received on 333 * the interface with that address. 334 */ 335 static int 336 div_output(struct socket *so, struct mbuf *m, 337 struct sockaddr_in *sin, struct mbuf *control) 338 { 339 int error = 0; 340 struct m_tag *mtag; 341 struct divert_info *divinfo; 342 343 if (control) 344 m_freem(control); /* XXX */ 345 346 /* 347 * Prepare the tag for divert info. Note that a packet 348 * with a 0 tag in mh_data is effectively untagged, 349 * so we could optimize that case. 350 */ 351 mtag = m_tag_get(PACKET_TAG_IPFW_DIVERT, sizeof(*divinfo), MB_DONTWAIT); 352 if (mtag == NULL) { 353 error = ENOBUFS; 354 goto cantsend; 355 } 356 m_tag_prepend(m, mtag); 357 358 /* Loopback avoidance and state recovery */ 359 divinfo = m_tag_data(mtag); 360 if (sin) 361 divinfo->skipto = sin->sin_port; 362 else 363 divinfo->skipto = 0; 364 365 /* Reinject packet into the system as incoming or outgoing */ 366 if (DIV_IS_OUTPUT(sin)) { 367 struct ip *const ip = mtod(m, struct ip *); 368 369 /* Don't allow packet length sizes that will crash */ 370 if ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len) { 371 error = EINVAL; 372 goto cantsend; 373 } 374 375 /* Convert fields to host order for ip_output() */ 376 ip->ip_len = ntohs(ip->ip_len); 377 ip->ip_off = ntohs(ip->ip_off); 378 379 /* Send packet to output processing */ 380 ipstat.ips_rawout++; /* XXX */ 381 error = ip_output(m, NULL, NULL, 382 (so->so_options & SO_DONTROUTE) | 383 IP_ALLOWBROADCAST | IP_RAWOUTPUT, 384 NULL, NULL); 385 } else { 386 ip_input(m); 387 } 388 return error; 389 390 cantsend: 391 m_freem(m); 392 return error; 393 } 394 395 static void 396 div_attach(netmsg_t msg) 397 { 398 struct socket *so = msg->attach.base.nm_so; 399 int proto = msg->attach.nm_proto; 400 struct pru_attach_info *ai = msg->attach.nm_ai; 401 struct inpcb *inp; 402 int error; 403 404 inp = so->so_pcb; 405 if (inp) 406 panic("div_attach"); 407 error = priv_check_cred(ai->p_ucred, PRIV_ROOT, NULL_CRED_OKAY); 408 if (error) 409 goto out; 410 411 error = soreserve(so, div_sendspace, div_recvspace, ai->sb_rlimit); 412 if (error) 413 goto out; 414 lwkt_gettoken(&div_token); 415 sosetport(so, cpu_portfn(0)); 416 error = in_pcballoc(so, &divcbinfo); 417 if (error) { 418 lwkt_reltoken(&div_token); 419 goto out; 420 } 421 inp = (struct inpcb *)so->so_pcb; 422 inp->inp_ip_p = proto; 423 inp->inp_vflag |= INP_IPV4; 424 inp->inp_flags |= INP_HDRINCL; 425 /* 426 * The socket is always "connected" because 427 * we always know "where" to send the packet. 428 */ 429 sosetstate(so, SS_ISCONNECTED); 430 lwkt_reltoken(&div_token); 431 error = 0; 432 out: 433 lwkt_replymsg(&msg->attach.base.lmsg, error); 434 } 435 436 static void 437 div_detach(netmsg_t msg) 438 { 439 struct socket *so = msg->detach.base.nm_so; 440 struct inpcb *inp; 441 442 inp = so->so_pcb; 443 if (inp == NULL) 444 panic("div_detach"); 445 in_pcbdetach(inp); 446 lwkt_replymsg(&msg->detach.base.lmsg, 0); 447 } 448 449 /* 450 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 451 * will sofree() it when we return. 452 */ 453 static void 454 div_abort(netmsg_t msg) 455 { 456 struct socket *so = msg->abort.base.nm_so; 457 458 soisdisconnected(so); 459 div_detach(msg); 460 /* msg invalid now */ 461 } 462 463 static void 464 div_disconnect(netmsg_t msg) 465 { 466 struct socket *so = msg->disconnect.base.nm_so; 467 int error; 468 469 if (so->so_state & SS_ISCONNECTED) { 470 soreference(so); 471 div_abort(msg); 472 /* msg invalid now */ 473 sofree(so); 474 return; 475 } 476 error = ENOTCONN; 477 lwkt_replymsg(&msg->disconnect.base.lmsg, error); 478 } 479 480 static void 481 div_bind(netmsg_t msg) 482 { 483 struct socket *so = msg->bind.base.nm_so; 484 struct sockaddr *nam = msg->bind.nm_nam; 485 int error; 486 487 /* 488 * in_pcbbind assumes that nam is a sockaddr_in 489 * and in_pcbbind requires a valid address. Since divert 490 * sockets don't we need to make sure the address is 491 * filled in properly. 492 * XXX -- divert should not be abusing in_pcbind 493 * and should probably have its own family. 494 */ 495 if (nam->sa_family != AF_INET) { 496 error = EAFNOSUPPORT; 497 } else { 498 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 499 error = in_pcbbind(so->so_pcb, nam, msg->bind.nm_td); 500 } 501 lwkt_replymsg(&msg->bind.base.lmsg, error); 502 } 503 504 static void 505 div_shutdown(netmsg_t msg) 506 { 507 struct socket *so = msg->shutdown.base.nm_so; 508 509 socantsendmore(so); 510 511 lwkt_replymsg(&msg->shutdown.base.lmsg, 0); 512 } 513 514 static void 515 div_send(netmsg_t msg) 516 { 517 struct socket *so = msg->send.base.nm_so; 518 struct mbuf *m = msg->send.nm_m; 519 struct sockaddr *nam = msg->send.nm_addr; 520 struct mbuf *control = msg->send.nm_control; 521 int error; 522 523 /* Length check already done in ip_cpufn() */ 524 KASSERT(m->m_len >= sizeof(struct ip), ("IP header not in one mbuf")); 525 526 /* Send packet */ 527 error = div_output(so, m, (struct sockaddr_in *)nam, control); 528 lwkt_replymsg(&msg->send.base.lmsg, error); 529 } 530 531 SYSCTL_DECL(_net_inet_divert); 532 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, &divcbinfo, 0, 533 in_pcblist_global, "S,xinpcb", "List of active divert sockets"); 534 535 struct pr_usrreqs div_usrreqs = { 536 .pru_abort = div_abort, 537 .pru_accept = pr_generic_notsupp, 538 .pru_attach = div_attach, 539 .pru_bind = div_bind, 540 .pru_connect = pr_generic_notsupp, 541 .pru_connect2 = pr_generic_notsupp, 542 .pru_control = in_control_dispatch, 543 .pru_detach = div_detach, 544 .pru_disconnect = div_disconnect, 545 .pru_listen = pr_generic_notsupp, 546 .pru_peeraddr = in_setpeeraddr_dispatch, 547 .pru_rcvd = pr_generic_notsupp, 548 .pru_rcvoob = pr_generic_notsupp, 549 .pru_send = div_send, 550 .pru_sense = pru_sense_null, 551 .pru_shutdown = div_shutdown, 552 .pru_sockaddr = in_setsockaddr_dispatch, 553 .pru_sosend = sosend, 554 .pru_soreceive = soreceive 555 }; 556 557 static struct mbuf * 558 ip_divert_out(struct mbuf *m, int tee) 559 { 560 struct mbuf *clone = NULL; 561 struct ip *ip = mtod(m, struct ip *); 562 563 /* Clone packet if we're doing a 'tee' */ 564 if (tee) 565 clone = m_dup(m, MB_DONTWAIT); 566 567 /* 568 * XXX 569 * delayed checksums are not currently compatible 570 * with divert sockets. 571 */ 572 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 573 in_delayed_cksum(m); 574 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 575 } 576 577 /* Restore packet header fields to original values */ 578 ip->ip_len = htons(ip->ip_len); 579 ip->ip_off = htons(ip->ip_off); 580 581 /* Deliver packet to divert input routine */ 582 divert_packet(m, 0); 583 584 /* If 'tee', continue with original packet */ 585 return clone; 586 } 587 588 static struct mbuf * 589 ip_divert_in(struct mbuf *m, int tee) 590 { 591 struct mbuf *clone = NULL; 592 struct ip *ip = mtod(m, struct ip *); 593 struct m_tag *mtag; 594 595 if (ip->ip_off & (IP_MF | IP_OFFMASK)) { 596 const struct divert_info *divinfo; 597 u_short frag_off; 598 int hlen; 599 600 /* 601 * Only trust divert info in the fragment 602 * at offset 0. 603 */ 604 frag_off = ip->ip_off << 3; 605 if (frag_off != 0) { 606 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 607 m_tag_delete(m, mtag); 608 } 609 610 /* 611 * Attempt reassembly; if it succeeds, proceed. 612 * ip_reass() will return a different mbuf. 613 */ 614 m = ip_reass(m); 615 if (m == NULL) 616 return NULL; 617 ip = mtod(m, struct ip *); 618 619 /* Caller need to redispatch the packet, if it is for us */ 620 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; 621 622 /* 623 * Get the header length of the reassembled 624 * packet 625 */ 626 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 627 628 /* 629 * Restore original checksum before diverting 630 * packet 631 */ 632 ip->ip_len += hlen; 633 ip->ip_len = htons(ip->ip_len); 634 ip->ip_off = htons(ip->ip_off); 635 ip->ip_sum = 0; 636 if (hlen == sizeof(struct ip)) 637 ip->ip_sum = in_cksum_hdr(ip); 638 else 639 ip->ip_sum = in_cksum(m, hlen); 640 ip->ip_off = ntohs(ip->ip_off); 641 ip->ip_len = ntohs(ip->ip_len); 642 643 /* 644 * Only use the saved divert info 645 */ 646 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 647 if (mtag == NULL) { 648 /* Wrongly configured ipfw */ 649 kprintf("ip_input no divert info\n"); 650 m_freem(m); 651 return NULL; 652 } 653 divinfo = m_tag_data(mtag); 654 tee = divinfo->tee; 655 } 656 657 /* 658 * Divert or tee packet to the divert protocol if 659 * required. 660 */ 661 662 /* Clone packet if we're doing a 'tee' */ 663 if (tee) 664 clone = m_dup(m, MB_DONTWAIT); 665 666 /* 667 * Restore packet header fields to original 668 * values 669 */ 670 ip->ip_len = htons(ip->ip_len); 671 ip->ip_off = htons(ip->ip_off); 672 673 /* Deliver packet to divert input routine */ 674 divert_packet(m, 1); 675 676 /* Catch invalid reference */ 677 m = NULL; 678 ip = NULL; 679 680 ipstat.ips_delivered++; 681 682 /* If 'tee', continue with original packet */ 683 if (clone != NULL) { 684 /* 685 * Complete processing of the packet. 686 * XXX Better safe than sorry, remove the DIVERT tag. 687 */ 688 mtag = m_tag_find(clone, PACKET_TAG_IPFW_DIVERT, NULL); 689 KKASSERT(mtag != NULL); 690 m_tag_delete(clone, mtag); 691 } 692 return clone; 693 } 694 695 static struct mbuf * 696 ip_divert(struct mbuf *m, int tee, int incoming) 697 { 698 struct mbuf *ret; 699 700 if (incoming) 701 ret = ip_divert_in(m, tee); 702 else 703 ret = ip_divert_out(m, tee); 704 return ret; 705 } 706