sys/netinet/ip_divert.c

   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. 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  * $FreeBSD: src/sys/netinet/ip_divert.c,v 1.42.2.6 2003/01/23 21:06:45 sam Exp $
  30  */
  31
  32 #define _IP_VHL
  33
  34 #include "opt_inet.h"
  35 #include "opt_ipdivert.h"
  36
  37 #ifndef INET
  38 #error "IPDIVERT requires INET."
  39 #endif
  40
  41 #include <sys/param.h>
  42 #include <sys/kernel.h>
  43 #include <sys/malloc.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/socket.h>
  46 #include <sys/protosw.h>
  47 #include <sys/socketvar.h>
  48 #include <sys/socketvar2.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/systm.h>
  51 #include <sys/proc.h>
  52 #include <sys/caps.h>
  53 #include <sys/in_cksum.h>
  54 #include <sys/lock.h>
  55 #include <sys/msgport.h>
  56
  57 #include <net/if.h>
  58 #include <net/route.h>
  59
  60 #include <net/netmsg2.h>
  61 #include <net/netisr2.h>
  62
  63 #include <netinet/in.h>
  64 #include <netinet/in_systm.h>
  65 #include <netinet/ip.h>
  66 #include <netinet/in_pcb.h>
  67 #include <netinet/in_var.h>
  68 #include <netinet/ip_var.h>
  69 #include <netinet/ip_divert.h>
  70
  71 /*
  72  * Divert sockets
  73  */
  74
  75 /*
  76  * Allocate enough space to hold a full IP packet
  77  */
  78 #define DIVSNDQ         (65536 + 100)
  79 #define DIVRCVQ         (65536 + 100)
  80
  81 #define DIV_IS_OUTPUT(sin)      ((sin) == NULL || (sin)->sin_addr.s_addr == 0)
  82
  83 #define DIV_OUTPUT      0x10000
  84 #define DIV_INPUT       0x20000
  85
  86 /*
  87  * Divert sockets work in conjunction with ipfw, see the divert(4)
  88  * manpage for features.
  89  * Internally, packets selected by ipfw in ip_input() or ip_output(),
  90  * and never diverted before, are passed to the input queue of the
  91  * divert socket with a given 'divert_port' number (as specified in
  92  * the matching ipfw rule), and they are tagged with a 16 bit cookie
  93  * (representing the rule number of the matching ipfw rule), which
  94  * is passed to process reading from the socket.
  95  *
  96  * Packets written to the divert socket are again tagged with a cookie
  97  * (usually the same as above) and a destination address.
  98  * If the destination address is INADDR_ANY then the packet is
  99  * treated as outgoing and sent to ip_output(), otherwise it is
 100  * treated as incoming and sent to ip_input().
 101  * In both cases, the packet is tagged with the cookie.
 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  * ipfw processing will start at the rule number after the one
 106  * written in the cookie (so, tagging a packet with a cookie of 0
 107  * will cause it to be effectively considered as a standard packet).
 108  */
 109
 110 /* Internal variables */
 111 static struct inpcbinfo divcbinfo;
 112 static struct inpcbportinfo divcbportinfo;
 113
 114 static u_long   div_sendspace = DIVSNDQ;        /* XXX sysctl ? */
 115 static u_long   div_recvspace = DIVRCVQ;        /* XXX sysctl ? */
 116
 117 static struct mbuf *ip_divert(struct mbuf *, int, int);
 118
 119 /*
 120  * Initialize divert connection block queue.
 121  */
 122 void
 123 div_init(void)
 124 {
 125         in_pcbinfo_init(&divcbinfo, 0, FALSE);
 126         in_pcbportinfo_init(&divcbportinfo, 1, 0);
 127         /*
 128          * XXX We don't use the hash list for divert IP, but it's easier
 129          * to allocate a one entry hash list than it is to check all
 130          * over the place for hashbase == NULL.
 131          */
 132         divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask);
 133         in_pcbportinfo_set(&divcbinfo, &divcbportinfo, 1);
 134         divcbinfo.wildcardhashbase = hashinit(1, M_PCB,
 135                                               &divcbinfo.wildcardhashmask);
 136         divcbinfo.ipi_size = sizeof(struct inpcb);
 137         ip_divert_p = ip_divert;
 138 }
 139
 140 /*
 141  * IPPROTO_DIVERT is not a real IP protocol; don't allow any packets
 142  * with that protocol number to enter the system from the outside.
 143  */
 144 int
 145 div_input(struct mbuf **mp, int *offp, int proto)
 146 {
 147         struct mbuf *m = *mp;
 148
 149         ipstat.ips_noproto++;
 150         m_freem(m);
 151         return(IPPROTO_DONE);
 152 }
 153
 154 /*
 155  * Divert a packet by passing it up to the divert socket at port 'port'.
 156  *
 157  * Setup generic address and protocol structures for div_input routine,
 158  * then pass them along with mbuf chain.
 159  */
 160 static void
 161 div_packet(struct mbuf *m, int incoming, int port)
 162 {
 163         struct sockaddr_in divsrc = { sizeof divsrc, AF_INET };
 164         struct inpcb *inp;
 165         struct socket *sa;
 166         struct m_tag *mtag;
 167         struct divert_info *divinfo;
 168         u_int16_t nport;
 169
 170         ASSERT_NETISR0;
 171
 172         /* Locate the divert info */
 173         mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
 174         divinfo = m_tag_data(mtag);
 175         divsrc.sin_port = divinfo->skipto;
 176
 177         /*
 178          * Record receive interface address, if any.
 179          * But only for incoming packets.
 180          */
 181         divsrc.sin_addr.s_addr = 0;
 182         if (incoming) {
 183                 struct ifaddr_container *ifac;
 184
 185                 /* Find IP address for receive interface */
 186                 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid],
 187                               ifa_link) {
 188                         struct ifaddr *ifa = ifac->ifa;
 189
 190                         if (ifa->ifa_addr == NULL)
 191                                 continue;
 192                         if (ifa->ifa_addr->sa_family != AF_INET)
 193                                 continue;
 194                         divsrc.sin_addr =
 195                             ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr;
 196                         break;
 197                 }
 198         }
 199         /*
 200          * Record the incoming interface name whenever we have one.
 201          */
 202         if (m->m_pkthdr.rcvif) {
 203                 /*
 204                  * Hide the actual interface name in there in the
 205                  * sin_zero array. XXX This needs to be moved to a
 206                  * different sockaddr type for divert, e.g.
 207                  * sockaddr_div with multiple fields like
 208                  * sockaddr_dl. Presently we have only 7 bytes
 209                  * but that will do for now as most interfaces
 210                  * are 4 or less + 2 or less bytes for unit.
 211                  * There is probably a faster way of doing this,
 212                  * possibly taking it from the sockaddr_dl on the iface.
 213                  * This solves the problem of a P2P link and a LAN interface
 214                  * having the same address, which can result in the wrong
 215                  * interface being assigned to the packet when fed back
 216                  * into the divert socket. Theoretically if the daemon saves
 217                  * and re-uses the sockaddr_in as suggested in the man pages,
 218                  * this iface name will come along for the ride.
 219                  * (see div_output for the other half of this.)
 220                  */
 221                 ksnprintf(divsrc.sin_zero, sizeof divsrc.sin_zero, "%s",
 222                           m->m_pkthdr.rcvif->if_xname);
 223         }
 224
 225         /* Put packet on socket queue, if any */
 226         sa = NULL;
 227         nport = htons((u_int16_t)port);
 228
 229         /*
 230          * Following loop to locate the inpcb is MPSAFE since the inpcb
 231          * insertion/removal happens on the same CPU (CPU0).
 232          */
 233         LIST_FOREACH(inp, &divcbinfo.pcblisthead, inp_list) {
 234                 if (inp->inp_flags & INP_PLACEMARKER)
 235                         continue;
 236                 if (inp->inp_lport == nport)
 237                         sa = inp->inp_socket;
 238         }
 239         if (sa) {
 240                 lwkt_gettoken(&sa->so_rcv.ssb_token);
 241                 if (ssb_appendaddr(&sa->so_rcv, (struct sockaddr *)&divsrc, m, NULL) == 0) {
 242                         m_freem(m);
 243                         soroverflow(sa);
 244                 } else
 245                         sorwakeup(sa);
 246                 lwkt_reltoken(&sa->so_rcv.ssb_token);
 247         } else {
 248                 m_freem(m);
 249                 ipstat.ips_noproto++;
 250                 ipstat.ips_delivered--;
 251         }
 252 }
 253
 254 static void
 255 div_packet_handler(netmsg_t msg)
 256 {
 257         struct mbuf *m;
 258         int port, incoming = 0;
 259
 260         m = msg->packet.nm_packet;
 261
 262         port = msg->lmsg.u.ms_result32 & 0xffff;
 263         if (msg->lmsg.u.ms_result32 & DIV_INPUT)
 264                 incoming = 1;
 265         div_packet(m, incoming, port);
 266         /* no reply, msg embedded in mbuf */
 267 }
 268
 269 static void
 270 divert_packet(struct mbuf *m, int incoming)
 271 {
 272         struct m_tag *mtag;
 273         struct divert_info *divinfo;
 274         int port;
 275
 276         M_ASSERTPKTHDR(m);
 277
 278         /* Assure header */
 279         if (m->m_len < sizeof(struct ip) &&
 280             (m = m_pullup(m, sizeof(struct ip))) == NULL)
 281                 return;
 282
 283         mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
 284         KASSERT(mtag != NULL, ("%s no divert tag!", __func__));
 285         divinfo = m_tag_data(mtag);
 286
 287         port = divinfo->port;
 288         KASSERT(port != 0, ("%s: port=0", __func__));
 289
 290         if (mycpuid != 0) {
 291                 struct netmsg_packet *nmp;
 292
 293                 nmp = &m->m_hdr.mh_netmsg;
 294                 netmsg_init(&nmp->base, NULL, &netisr_apanic_rport,
 295                             0, div_packet_handler);
 296                 nmp->nm_packet = m;
 297
 298                 nmp->base.lmsg.u.ms_result32 = port; /* port is 16bits */
 299                 if (incoming)
 300                         nmp->base.lmsg.u.ms_result32 |= DIV_INPUT;
 301                 else
 302                         nmp->base.lmsg.u.ms_result32 |= DIV_OUTPUT;
 303
 304                 lwkt_sendmsg(netisr_cpuport(0), &nmp->base.lmsg);
 305         } else {
 306                 div_packet(m, incoming, port);
 307         }
 308 }
 309
 310 /*
 311  * Deliver packet back into the IP processing machinery.
 312  *
 313  * If no address specified, or address is 0.0.0.0, send to ip_output();
 314  * otherwise, send to ip_input() and mark as having been received on
 315  * the interface with that address.
 316  */
 317 static int
 318 div_output(struct socket *so, struct mbuf *m,
 319         struct sockaddr_in *sin, struct mbuf *control)
 320 {
 321         int error = 0;
 322         struct m_tag *mtag;
 323         struct divert_info *divinfo;
 324
 325         ASSERT_NETISR0;
 326
 327         if (control)
 328                 m_freem(control);               /* XXX */
 329
 330         /*
 331          * Prepare the tag for divert info. Note that a packet
 332          * with a 0 tag in mh_data is effectively untagged,
 333          * so we could optimize that case.
 334          */
 335         mtag = m_tag_get(PACKET_TAG_IPFW_DIVERT, sizeof(*divinfo), M_NOWAIT);
 336         if (mtag == NULL) {
 337                 error = ENOBUFS;
 338                 goto cantsend;
 339         }
 340         m_tag_prepend(m, mtag);
 341
 342         /* Loopback avoidance and state recovery */
 343         divinfo = m_tag_data(mtag);
 344         if (sin)
 345                 divinfo->skipto = sin->sin_port;
 346         else
 347                 divinfo->skipto = 0;
 348
 349         /* Reinject packet into the system as incoming or outgoing */
 350         if (DIV_IS_OUTPUT(sin)) {
 351                 struct ip *const ip = mtod(m, struct ip *);
 352
 353                 /* Don't allow packet length sizes that will crash */
 354                 if ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len) {
 355                         error = EINVAL;
 356                         goto cantsend;
 357                 }
 358
 359                 /* Send packet to output processing */
 360                 ipstat.ips_rawout++;                    /* XXX */
 361                 error = ip_output(m, NULL, NULL,
 362                             (so->so_options & SO_DONTROUTE) |
 363                             IP_ALLOWBROADCAST | IP_RAWOUTPUT,
 364                             NULL, NULL);
 365         } else {
 366                 ip_input(m);
 367         }
 368         return error;
 369
 370 cantsend:
 371         m_freem(m);
 372         return error;
 373 }
 374
 375 static void
 376 div_attach(netmsg_t msg)
 377 {
 378         struct socket *so = msg->attach.base.nm_so;
 379         int proto = msg->attach.nm_proto;
 380         struct pru_attach_info *ai = msg->attach.nm_ai;
 381         struct inpcb *inp;
 382         int error;
 383
 384         ASSERT_NETISR0;
 385
 386         inp  = so->so_pcb;
 387         if (inp)
 388                 panic("div_attach");
 389         error = caps_priv_check(ai->p_ucred, SYSCAP_RESTRICTEDROOT |
 390                                              __SYSCAP_NULLCRED);
 391         if (error)
 392                 goto out;
 393
 394         error = soreserve(so, div_sendspace, div_recvspace, ai->sb_rlimit);
 395         if (error)
 396                 goto out;
 397         error = in_pcballoc(so, &divcbinfo);
 398         if (error)
 399                 goto out;
 400         inp = (struct inpcb *)so->so_pcb;
 401         inp->inp_ip_p = proto;
 402         inp->inp_flags |= INP_HDRINCL;
 403         /*
 404          * The socket is always "connected" because
 405          * we always know "where" to send the packet.
 406          */
 407         sosetstate(so, SS_ISCONNECTED);
 408         error = 0;
 409 out:
 410         lwkt_replymsg(&msg->attach.base.lmsg, error);
 411 }
 412
 413 static void
 414 div_detach(netmsg_t msg)
 415 {
 416         struct socket *so = msg->detach.base.nm_so;
 417         struct inpcb *inp;
 418
 419         ASSERT_NETISR0;
 420
 421         inp = so->so_pcb;
 422         if (inp == NULL)
 423                 panic("div_detach");
 424         in_pcbdetach(inp);
 425         lwkt_replymsg(&msg->detach.base.lmsg, 0);
 426 }
 427
 428 static void
 429 div_abort(netmsg_t msg)
 430 {
 431         /*
 432          * Divert socket does not support listen(2),
 433          * so this should never be called.
 434          */
 435         panic("div_abort is called");
 436 }
 437
 438 static void
 439 div_disconnect(netmsg_t msg)
 440 {
 441         struct socket *so = msg->disconnect.base.nm_so;
 442         int error;
 443
 444         ASSERT_NETISR0;
 445
 446         if (so->so_state & SS_ISCONNECTED) {
 447                 soisdisconnected(so);
 448                 error = 0;
 449         } else {
 450                 error = ENOTCONN;
 451         }
 452         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
 453 }
 454
 455 static void
 456 div_bind(netmsg_t msg)
 457 {
 458         struct socket *so = msg->bind.base.nm_so;
 459         struct sockaddr *nam = msg->bind.nm_nam;
 460         int error;
 461
 462         ASSERT_NETISR0;
 463
 464         /*
 465          * in_pcbbind assumes that nam is a sockaddr_in
 466          * and in_pcbbind requires a valid address. Since divert
 467          * sockets don't we need to make sure the address is
 468          * filled in properly.
 469          * XXX -- divert should not be abusing in_pcbind
 470          * and should probably have its own family.
 471          */
 472         if (nam->sa_family != AF_INET) {
 473                 error = EAFNOSUPPORT;
 474         } else {
 475                 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY;
 476                 error = in_pcbbind(so->so_pcb, nam, msg->bind.nm_td);
 477         }
 478         lwkt_replymsg(&msg->bind.base.lmsg, error);
 479 }
 480
 481 static void
 482 div_shutdown(netmsg_t msg)
 483 {
 484         struct socket *so = msg->shutdown.base.nm_so;
 485
 486         ASSERT_NETISR0;
 487
 488         socantsendmore(so);
 489
 490         lwkt_replymsg(&msg->shutdown.base.lmsg, 0);
 491 }
 492
 493 static void
 494 div_send(netmsg_t msg)
 495 {
 496         struct socket *so = msg->send.base.nm_so;
 497         struct mbuf *m = msg->send.nm_m;
 498         struct sockaddr *nam = msg->send.nm_addr;
 499         struct mbuf *control = msg->send.nm_control;
 500         int error;
 501
 502         /* Length check already done in ip_hashfn() */
 503         KASSERT(m->m_len >= sizeof(struct ip), ("IP header not in one mbuf"));
 504
 505         /* Send packet */
 506         error = div_output(so, m, (struct sockaddr_in *)nam, control);
 507         lwkt_replymsg(&msg->send.base.lmsg, error);
 508 }
 509
 510 SYSCTL_DECL(_net_inet_divert);
 511 SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, &divcbinfo, 1,
 512             in_pcblist_range, "S,xinpcb", "List of active divert sockets");
 513
 514 struct pr_usrreqs div_usrreqs = {
 515         .pru_abort = div_abort,
 516         .pru_accept = pr_generic_notsupp,
 517         .pru_attach = div_attach,
 518         .pru_bind = div_bind,
 519         .pru_connect = pr_generic_notsupp,
 520         .pru_connect2 = pr_generic_notsupp,
 521         .pru_control = in_control_dispatch,
 522         .pru_detach = div_detach,
 523         .pru_disconnect = div_disconnect,
 524         .pru_listen = pr_generic_notsupp,
 525         .pru_peeraddr = in_setpeeraddr_dispatch,
 526         .pru_rcvd = pr_generic_notsupp,
 527         .pru_rcvoob = pr_generic_notsupp,
 528         .pru_send = div_send,
 529         .pru_sense = pru_sense_null,
 530         .pru_shutdown = div_shutdown,
 531         .pru_sockaddr = in_setsockaddr_dispatch,
 532         .pru_sosend = sosend,
 533         .pru_soreceive = soreceive
 534 };
 535
 536 static struct mbuf *
 537 ip_divert_out(struct mbuf *m, int tee)
 538 {
 539         struct mbuf *clone = NULL;
 540         //struct ip *ip = mtod(m, struct ip *);
 541
 542         /* Clone packet if we're doing a 'tee' */
 543         if (tee)
 544                 clone = m_dup(m, M_NOWAIT);
 545
 546         /*
 547          * XXX
 548          * delayed checksums are not currently compatible
 549          * with divert sockets.
 550          */
 551         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 552                 in_delayed_cksum(m);
 553                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 554         }
 555
 556         /* Deliver packet to divert input routine */
 557         divert_packet(m, 0);
 558
 559         /* If 'tee', continue with original packet */
 560         return clone;
 561 }
 562
 563 static struct mbuf *
 564 ip_divert_in(struct mbuf *m, int tee)
 565 {
 566         struct mbuf *clone = NULL;
 567         struct ip *ip = mtod(m, struct ip *);
 568         struct m_tag *mtag;
 569
 570         if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
 571                 const struct divert_info *divinfo;
 572                 u_short frag_off;
 573                 int hlen;
 574
 575                 /*
 576                  * Only trust divert info in the fragment
 577                  * at offset 0.
 578                  */
 579                 frag_off = ntohs(ip->ip_off) << 3;
 580                 if (frag_off != 0) {
 581                         mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
 582                         m_tag_delete(m, mtag);
 583                 }
 584
 585                 /*
 586                  * Attempt reassembly; if it succeeds, proceed.
 587                  * ip_reass() will return a different mbuf.
 588                  */
 589                 m = ip_reass(m);
 590                 if (m == NULL)
 591                         return NULL;
 592                 ip = mtod(m, struct ip *);
 593
 594                 /* Caller need to redispatch the packet, if it is for us */
 595                 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH;
 596
 597                 /*
 598                  * Get the header length of the reassembled
 599                  * packet
 600                  */
 601                 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
 602
 603                 /*
 604                  * Restore original checksum before diverting
 605                  * packet
 606                  */
 607                 ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
 608                 ip->ip_sum = 0;
 609                 if (hlen == sizeof(struct ip))
 610                         ip->ip_sum = in_cksum_hdr(ip);
 611                 else
 612                         ip->ip_sum = in_cksum(m, hlen);
 613
 614                 /*
 615                  * Only use the saved divert info
 616                  */
 617                 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
 618                 if (mtag == NULL) {
 619                         /* Wrongly configured ipfw */
 620                         kprintf("ip_input no divert info\n");
 621                         m_freem(m);
 622                         return NULL;
 623                 }
 624                 divinfo = m_tag_data(mtag);
 625                 tee = divinfo->tee;
 626         }
 627
 628         /*
 629          * Divert or tee packet to the divert protocol if
 630          * required.
 631          */
 632
 633         /* Clone packet if we're doing a 'tee' */
 634         if (tee)
 635                 clone = m_dup(m, M_NOWAIT);
 636
 637         /* Deliver packet to divert input routine */
 638         divert_packet(m, 1);
 639
 640         /* Catch invalid reference */
 641         m = NULL;
 642         ip = NULL;
 643
 644         ipstat.ips_delivered++;
 645
 646         /* If 'tee', continue with original packet */
 647         if (clone != NULL) {
 648                 /*
 649                  * Complete processing of the packet.
 650                  * XXX Better safe than sorry, remove the DIVERT tag.
 651                  */
 652                 mtag = m_tag_find(clone, PACKET_TAG_IPFW_DIVERT, NULL);
 653                 KKASSERT(mtag != NULL);
 654                 m_tag_delete(clone, mtag);
 655         }
 656         return clone;
 657 }
 658
 659 static struct mbuf *
 660 ip_divert(struct mbuf *m, int tee, int incoming)
 661 {
 662         struct mbuf *ret;
 663
 664         if (incoming)
 665                 ret = ip_divert_in(m, tee);
 666         else
 667                 ret = ip_divert_out(m, tee);
 668         return ret;
 669 }