sys/netinet/ip_output.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1988, 1990, 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  * 4. 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  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include "opt_inet.h"
  36 #include "opt_ratelimit.h"
  37 #include "opt_ipsec.h"
  38 #include "opt_mbuf_stress_test.h"
  39 #include "opt_mpath.h"
  40 #include "opt_route.h"
  41 #include "opt_sctp.h"
  42 #include "opt_rss.h"
  43
  44 #include <sys/param.h>
  45 #include <sys/systm.h>
  46 #include <sys/kernel.h>
  47 #include <sys/lock.h>
  48 #include <sys/malloc.h>
  49 #include <sys/mbuf.h>
  50 #include <sys/priv.h>
  51 #include <sys/proc.h>
  52 #include <sys/protosw.h>
  53 #include <sys/rmlock.h>
  54 #include <sys/sdt.h>
  55 #include <sys/socket.h>
  56 #include <sys/socketvar.h>
  57 #include <sys/sysctl.h>
  58 #include <sys/ucred.h>
  59
  60 #include <net/if.h>
  61 #include <net/if_var.h>
  62 #include <net/if_llatbl.h>
  63 #include <net/netisr.h>
  64 #include <net/pfil.h>
  65 #include <net/route.h>
  66 #include <net/flowtable.h>
  67 #ifdef RADIX_MPATH
  68 #include <net/radix_mpath.h>
  69 #endif
  70 #include <net/rss_config.h>
  71 #include <net/vnet.h>
  72
  73 #include <netinet/in.h>
  74 #include <netinet/in_kdtrace.h>
  75 #include <netinet/in_systm.h>
  76 #include <netinet/ip.h>
  77 #include <netinet/in_pcb.h>
  78 #include <netinet/in_rss.h>
  79 #include <netinet/in_var.h>
  80 #include <netinet/ip_var.h>
  81 #include <netinet/ip_options.h>
  82 #ifdef SCTP
  83 #include <netinet/sctp.h>
  84 #include <netinet/sctp_crc32.h>
  85 #endif
  86
  87 #ifdef IPSEC
  88 #include <netinet/ip_ipsec.h>
  89 #include <netipsec/ipsec.h>
  90 #endif /* IPSEC*/
  91
  92 #include <machine/in_cksum.h>
  93
  94 #include <security/mac/mac_framework.h>
  95
  96 #ifdef MBUF_STRESS_TEST
  97 static int mbuf_frag_size = 0;
  98 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
  99         &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
 100 #endif
 101
 102 static void     ip_mloopback(struct ifnet *, const struct mbuf *, int);
 103
 104
 105 extern int in_mcast_loop;
 106 extern  struct protosw inetsw[];
 107
 108 static inline int
 109 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp,
 110     struct sockaddr_in *dst, int *fibnum, int *error)
 111 {
 112         struct m_tag *fwd_tag = NULL;
 113         struct mbuf *m;
 114         struct in_addr odst;
 115         struct ip *ip;
 116
 117         m = *mp;
 118         ip = mtod(m, struct ip *);
 119
 120         /* Run through list of hooks for output packets. */
 121         odst.s_addr = ip->ip_dst.s_addr;
 122         *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, inp);
 123         m = *mp;
 124         if ((*error) != 0 || m == NULL)
 125                 return 1; /* Finished */
 126
 127         ip = mtod(m, struct ip *);
 128
 129         /* See if destination IP address was changed by packet filter. */
 130         if (odst.s_addr != ip->ip_dst.s_addr) {
 131                 m->m_flags |= M_SKIP_FIREWALL;
 132                 /* If destination is now ourself drop to ip_input(). */
 133                 if (in_localip(ip->ip_dst)) {
 134                         m->m_flags |= M_FASTFWD_OURS;
 135                         if (m->m_pkthdr.rcvif == NULL)
 136                                 m->m_pkthdr.rcvif = V_loif;
 137                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 138                                 m->m_pkthdr.csum_flags |=
 139                                         CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 140                                 m->m_pkthdr.csum_data = 0xffff;
 141                         }
 142                         m->m_pkthdr.csum_flags |=
 143                                 CSUM_IP_CHECKED | CSUM_IP_VALID;
 144 #ifdef SCTP
 145                         if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 146                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 147 #endif
 148                         *error = netisr_queue(NETISR_IP, m);
 149                         return 1; /* Finished */
 150                 }
 151
 152                 bzero(dst, sizeof(*dst));
 153                 dst->sin_family = AF_INET;
 154                 dst->sin_len = sizeof(*dst);
 155                 dst->sin_addr = ip->ip_dst;
 156
 157                 return -1; /* Reloop */
 158         }
 159         /* See if fib was changed by packet filter. */
 160         if ((*fibnum) != M_GETFIB(m)) {
 161                 m->m_flags |= M_SKIP_FIREWALL;
 162                 *fibnum = M_GETFIB(m);
 163                 return -1; /* Reloop for FIB change */
 164         }
 165
 166         /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
 167         if (m->m_flags & M_FASTFWD_OURS) {
 168                 if (m->m_pkthdr.rcvif == NULL)
 169                         m->m_pkthdr.rcvif = V_loif;
 170                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 171                         m->m_pkthdr.csum_flags |=
 172                                 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 173                         m->m_pkthdr.csum_data = 0xffff;
 174                 }
 175 #ifdef SCTP
 176                 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 177                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 178 #endif
 179                 m->m_pkthdr.csum_flags |=
 180                         CSUM_IP_CHECKED | CSUM_IP_VALID;
 181
 182                 *error = netisr_queue(NETISR_IP, m);
 183                 return 1; /* Finished */
 184         }
 185         /* Or forward to some other address? */
 186         if ((m->m_flags & M_IP_NEXTHOP) &&
 187             ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
 188                 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
 189                 m->m_flags |= M_SKIP_FIREWALL;
 190                 m->m_flags &= ~M_IP_NEXTHOP;
 191                 m_tag_delete(m, fwd_tag);
 192
 193                 return -1; /* Reloop for CHANGE of dst */
 194         }
 195
 196         return 0;
 197 }
 198
 199 /*
 200  * IP output.  The packet in mbuf chain m contains a skeletal IP
 201  * header (with len, off, ttl, proto, tos, src, dst).
 202  * The mbuf chain containing the packet will be freed.
 203  * The mbuf opt, if present, will not be freed.
 204  * If route ro is present and has ro_rt initialized, route lookup would be
 205  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 206  * then result of route lookup is stored in ro->ro_rt.
 207  *
 208  * In the IP forwarding case, the packet will arrive with options already
 209  * inserted, so must have a NULL opt pointer.
 210  */
 211 int
 212 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 213     struct ip_moptions *imo, struct inpcb *inp)
 214 {
 215         struct rm_priotracker in_ifa_tracker;
 216         struct ip *ip;
 217         struct ifnet *ifp = NULL;       /* keep compiler happy */
 218         struct mbuf *m0;
 219         int hlen = sizeof (struct ip);
 220         int mtu;
 221         int error = 0;
 222         struct sockaddr_in *dst;
 223         const struct sockaddr_in *gw;
 224         struct in_ifaddr *ia;
 225         int isbroadcast;
 226         uint16_t ip_len, ip_off;
 227         struct route iproute;
 228         struct rtentry *rte;    /* cache for ro->ro_rt */
 229         uint32_t fibnum;
 230         int have_ia_ref;
 231 #ifdef IPSEC
 232         int no_route_but_check_spd = 0;
 233 #endif
 234         M_ASSERTPKTHDR(m);
 235
 236         if (inp != NULL) {
 237                 INP_LOCK_ASSERT(inp);
 238                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 239                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 240                         m->m_pkthdr.flowid = inp->inp_flowid;
 241                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 242                 }
 243         }
 244
 245         if (ro == NULL) {
 246                 ro = &iproute;
 247                 bzero(ro, sizeof (*ro));
 248         } else
 249                 ro->ro_flags |= RT_LLE_CACHE;
 250
 251 #ifdef FLOWTABLE
 252         if (ro->ro_rt == NULL)
 253                 (void )flowtable_lookup(AF_INET, m, ro);
 254 #endif
 255
 256         if (opt) {
 257                 int len = 0;
 258                 m = ip_insertoptions(m, opt, &len);
 259                 if (len != 0)
 260                         hlen = len; /* ip->ip_hl is updated above */
 261         }
 262         ip = mtod(m, struct ip *);
 263         ip_len = ntohs(ip->ip_len);
 264         ip_off = ntohs(ip->ip_off);
 265
 266         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
 267                 ip->ip_v = IPVERSION;
 268                 ip->ip_hl = hlen >> 2;
 269                 ip_fillid(ip);
 270                 IPSTAT_INC(ips_localout);
 271         } else {
 272                 /* Header already set, fetch hlen from there */
 273                 hlen = ip->ip_hl << 2;
 274         }
 275
 276         /*
 277          * dst/gw handling:
 278          *
 279          * dst can be rewritten but always points to &ro->ro_dst.
 280          * gw is readonly but can point either to dst OR rt_gateway,
 281          * therefore we need restore gw if we're redoing lookup.
 282          */
 283         gw = dst = (struct sockaddr_in *)&ro->ro_dst;
 284         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 285         rte = ro->ro_rt;
 286         if (rte == NULL) {
 287                 bzero(dst, sizeof(*dst));
 288                 dst->sin_family = AF_INET;
 289                 dst->sin_len = sizeof(*dst);
 290                 dst->sin_addr = ip->ip_dst;
 291         }
 292 again:
 293         /*
 294          * Validate route against routing table additions;
 295          * a better/more specific route might have been added.
 296          */
 297         if (inp)
 298                 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
 299         /*
 300          * If there is a cached route,
 301          * check that it is to the same destination
 302          * and is still up.  If not, free it and try again.
 303          * The address family should also be checked in case of sharing the
 304          * cache with IPv6.
 305          * Also check whether routing cache needs invalidation.
 306          */
 307         rte = ro->ro_rt;
 308         if (rte && ((rte->rt_flags & RTF_UP) == 0 ||
 309                     rte->rt_ifp == NULL ||
 310                     !RT_LINK_IS_UP(rte->rt_ifp) ||
 311                           dst->sin_family != AF_INET ||
 312                           dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
 313                 RTFREE(rte);
 314                 rte = ro->ro_rt = (struct rtentry *)NULL;
 315                 if (ro->ro_lle)
 316                         LLE_FREE(ro->ro_lle);   /* zeros ro_lle */
 317                 ro->ro_lle = (struct llentry *)NULL;
 318         }
 319         ia = NULL;
 320         have_ia_ref = 0;
 321         /*
 322          * If routing to interface only, short circuit routing lookup.
 323          * The use of an all-ones broadcast address implies this; an
 324          * interface is specified by the broadcast address of an interface,
 325          * or the destination address of a ptp interface.
 326          */
 327         if (flags & IP_SENDONES) {
 328                 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
 329                                                       M_GETFIB(m)))) == NULL &&
 330                     (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 331                                                     M_GETFIB(m)))) == NULL) {
 332                         IPSTAT_INC(ips_noroute);
 333                         error = ENETUNREACH;
 334                         goto bad;
 335                 }
 336                 have_ia_ref = 1;
 337                 ip->ip_dst.s_addr = INADDR_BROADCAST;
 338                 dst->sin_addr = ip->ip_dst;
 339                 ifp = ia->ia_ifp;
 340                 ip->ip_ttl = 1;
 341                 isbroadcast = 1;
 342         } else if (flags & IP_ROUTETOIF) {
 343                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 344                                                     M_GETFIB(m)))) == NULL &&
 345                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
 346                                                 M_GETFIB(m)))) == NULL) {
 347                         IPSTAT_INC(ips_noroute);
 348                         error = ENETUNREACH;
 349                         goto bad;
 350                 }
 351                 have_ia_ref = 1;
 352                 ifp = ia->ia_ifp;
 353                 ip->ip_ttl = 1;
 354                 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
 355                     in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
 356         } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
 357             imo != NULL && imo->imo_multicast_ifp != NULL) {
 358                 /*
 359                  * Bypass the normal routing lookup for multicast
 360                  * packets if the interface is specified.
 361                  */
 362                 ifp = imo->imo_multicast_ifp;
 363                 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
 364                 if (ia)
 365                         have_ia_ref = 1;
 366                 isbroadcast = 0;        /* fool gcc */
 367         } else {
 368                 /*
 369                  * We want to do any cloning requested by the link layer,
 370                  * as this is probably required in all cases for correct
 371                  * operation (as it is for ARP).
 372                  */
 373                 if (rte == NULL) {
 374 #ifdef RADIX_MPATH
 375                         rtalloc_mpath_fib(ro,
 376                             ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
 377                             fibnum);
 378 #else
 379                         in_rtalloc_ign(ro, 0, fibnum);
 380 #endif
 381                         rte = ro->ro_rt;
 382                 }
 383                 if (rte == NULL ||
 384                     (rte->rt_flags & RTF_UP) == 0 ||
 385                     rte->rt_ifp == NULL ||
 386                     !RT_LINK_IS_UP(rte->rt_ifp)) {
 387 #ifdef IPSEC
 388                         /*
 389                          * There is no route for this packet, but it is
 390                          * possible that a matching SPD entry exists.
 391                          */
 392                         no_route_but_check_spd = 1;
 393                         mtu = 0; /* Silence GCC warning. */
 394                         goto sendit;
 395 #endif
 396                         IPSTAT_INC(ips_noroute);
 397                         error = EHOSTUNREACH;
 398                         goto bad;
 399                 }
 400                 ia = ifatoia(rte->rt_ifa);
 401                 ifp = rte->rt_ifp;
 402                 counter_u64_add(rte->rt_pksent, 1);
 403                 rt_update_ro_flags(ro);
 404                 if (rte->rt_flags & RTF_GATEWAY)
 405                         gw = (struct sockaddr_in *)rte->rt_gateway;
 406                 if (rte->rt_flags & RTF_HOST)
 407                         isbroadcast = (rte->rt_flags & RTF_BROADCAST);
 408                 else if (ifp->if_flags & IFF_BROADCAST)
 409                         isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
 410                 else
 411                         isbroadcast = 0;
 412         }
 413
 414         /*
 415          * Calculate MTU.  If we have a route that is up, use that,
 416          * otherwise use the interface's MTU.
 417          */
 418         if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
 419                 mtu = rte->rt_mtu;
 420         else
 421                 mtu = ifp->if_mtu;
 422         /* Catch a possible divide by zero later. */
 423         KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
 424             __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
 425
 426         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 427                 m->m_flags |= M_MCAST;
 428                 /*
 429                  * IP destination address is multicast.  Make sure "gw"
 430                  * still points to the address in "ro".  (It may have been
 431                  * changed to point to a gateway address, above.)
 432                  */
 433                 gw = dst;
 434                 /*
 435                  * See if the caller provided any multicast options
 436                  */
 437                 if (imo != NULL) {
 438                         ip->ip_ttl = imo->imo_multicast_ttl;
 439                         if (imo->imo_multicast_vif != -1)
 440                                 ip->ip_src.s_addr =
 441                                     ip_mcast_src ?
 442                                     ip_mcast_src(imo->imo_multicast_vif) :
 443                                     INADDR_ANY;
 444                 } else
 445                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
 446                 /*
 447                  * Confirm that the outgoing interface supports multicast.
 448                  */
 449                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
 450                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
 451                                 IPSTAT_INC(ips_noroute);
 452                                 error = ENETUNREACH;
 453                                 goto bad;
 454                         }
 455                 }
 456                 /*
 457                  * If source address not specified yet, use address
 458                  * of outgoing interface.
 459                  */
 460                 if (ip->ip_src.s_addr == INADDR_ANY) {
 461                         /* Interface may have no addresses. */
 462                         if (ia != NULL)
 463                                 ip->ip_src = IA_SIN(ia)->sin_addr;
 464                 }
 465
 466                 if ((imo == NULL && in_mcast_loop) ||
 467                     (imo && imo->imo_multicast_loop)) {
 468                         /*
 469                          * Loop back multicast datagram if not expressly
 470                          * forbidden to do so, even if we are not a member
 471                          * of the group; ip_input() will filter it later,
 472                          * thus deferring a hash lookup and mutex acquisition
 473                          * at the expense of a cheap copy using m_copym().
 474                          */
 475                         ip_mloopback(ifp, m, hlen);
 476                 } else {
 477                         /*
 478                          * If we are acting as a multicast router, perform
 479                          * multicast forwarding as if the packet had just
 480                          * arrived on the interface to which we are about
 481                          * to send.  The multicast forwarding function
 482                          * recursively calls this function, using the
 483                          * IP_FORWARDING flag to prevent infinite recursion.
 484                          *
 485                          * Multicasts that are looped back by ip_mloopback(),
 486                          * above, will be forwarded by the ip_input() routine,
 487                          * if necessary.
 488                          */
 489                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
 490                                 /*
 491                                  * If rsvp daemon is not running, do not
 492                                  * set ip_moptions. This ensures that the packet
 493                                  * is multicast and not just sent down one link
 494                                  * as prescribed by rsvpd.
 495                                  */
 496                                 if (!V_rsvp_on)
 497                                         imo = NULL;
 498                                 if (ip_mforward &&
 499                                     ip_mforward(ip, ifp, m, imo) != 0) {
 500                                         m_freem(m);
 501                                         goto done;
 502                                 }
 503                         }
 504                 }
 505
 506                 /*
 507                  * Multicasts with a time-to-live of zero may be looped-
 508                  * back, above, but must not be transmitted on a network.
 509                  * Also, multicasts addressed to the loopback interface
 510                  * are not sent -- the above call to ip_mloopback() will
 511                  * loop back a copy. ip_input() will drop the copy if
 512                  * this host does not belong to the destination group on
 513                  * the loopback interface.
 514                  */
 515                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
 516                         m_freem(m);
 517                         goto done;
 518                 }
 519
 520                 goto sendit;
 521         }
 522
 523         /*
 524          * If the source address is not specified yet, use the address
 525          * of the outoing interface.
 526          */
 527         if (ip->ip_src.s_addr == INADDR_ANY) {
 528                 /* Interface may have no addresses. */
 529                 if (ia != NULL) {
 530                         ip->ip_src = IA_SIN(ia)->sin_addr;
 531                 }
 532         }
 533
 534         /*
 535          * Look for broadcast address and
 536          * verify user is allowed to send
 537          * such a packet.
 538          */
 539         if (isbroadcast) {
 540                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 541                         error = EADDRNOTAVAIL;
 542                         goto bad;
 543                 }
 544                 if ((flags & IP_ALLOWBROADCAST) == 0) {
 545                         error = EACCES;
 546                         goto bad;
 547                 }
 548                 /* don't allow broadcast messages to be fragmented */
 549                 if (ip_len > mtu) {
 550                         error = EMSGSIZE;
 551                         goto bad;
 552                 }
 553                 m->m_flags |= M_BCAST;
 554         } else {
 555                 m->m_flags &= ~M_BCAST;
 556         }
 557
 558 sendit:
 559 #ifdef IPSEC
 560         switch(ip_ipsec_output(&m, inp, &error)) {
 561         case 1:
 562                 goto bad;
 563         case -1:
 564                 goto done;
 565         case 0:
 566         default:
 567                 break;  /* Continue with packet processing. */
 568         }
 569         /*
 570          * Check if there was a route for this packet; return error if not.
 571          */
 572         if (no_route_but_check_spd) {
 573                 IPSTAT_INC(ips_noroute);
 574                 error = EHOSTUNREACH;
 575                 goto bad;
 576         }
 577         /* Update variables that are affected by ipsec4_output(). */
 578         ip = mtod(m, struct ip *);
 579         hlen = ip->ip_hl << 2;
 580 #endif /* IPSEC */
 581
 582         /* Jump over all PFIL processing if hooks are not active. */
 583         if (PFIL_HOOKED(&V_inet_pfil_hook)) {
 584                 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
 585                 case 1: /* Finished */
 586                         goto done;
 587
 588                 case 0: /* Continue normally */
 589                         ip = mtod(m, struct ip *);
 590                         break;
 591
 592                 case -1: /* Need to try again */
 593                         /* Reset everything for a new round */
 594                         RO_RTFREE(ro);
 595                         if (have_ia_ref)
 596                                 ifa_free(&ia->ia_ifa);
 597                         ro->ro_prepend = NULL;
 598                         rte = NULL;
 599                         gw = dst;
 600                         ip = mtod(m, struct ip *);
 601                         goto again;
 602
 603                 }
 604         }
 605
 606         /* 127/8 must not appear on wire - RFC1122. */
 607         if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
 608             (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
 609                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
 610                         IPSTAT_INC(ips_badaddr);
 611                         error = EADDRNOTAVAIL;
 612                         goto bad;
 613                 }
 614         }
 615
 616         m->m_pkthdr.csum_flags |= CSUM_IP;
 617         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
 618                 in_delayed_cksum(m);
 619                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 620         }
 621 #ifdef SCTP
 622         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
 623                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
 624                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 625         }
 626 #endif
 627
 628         /*
 629          * If small enough for interface, or the interface will take
 630          * care of the fragmentation for us, we can just send directly.
 631          */
 632         if (ip_len <= mtu ||
 633             (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
 634                 ip->ip_sum = 0;
 635                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
 636                         ip->ip_sum = in_cksum(m, hlen);
 637                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 638                 }
 639
 640                 /*
 641                  * Record statistics for this interface address.
 642                  * With CSUM_TSO the byte/packet count will be slightly
 643                  * incorrect because we count the IP+TCP headers only
 644                  * once instead of for every generated packet.
 645                  */
 646                 if (!(flags & IP_FORWARDING) && ia) {
 647                         if (m->m_pkthdr.csum_flags & CSUM_TSO)
 648                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
 649                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
 650                         else
 651                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 652
 653                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
 654                 }
 655 #ifdef MBUF_STRESS_TEST
 656                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
 657                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
 658 #endif
 659                 /*
 660                  * Reset layer specific mbuf flags
 661                  * to avoid confusing lower layers.
 662                  */
 663                 m_clrprotoflags(m);
 664                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
 665 #ifdef RATELIMIT
 666                 if (inp != NULL) {
 667                         if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 668                                 in_pcboutput_txrtlmt(inp, ifp, m);
 669                         /* stamp send tag on mbuf */
 670                         m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 671                 } else {
 672                         m->m_pkthdr.snd_tag = NULL;
 673                 }
 674 #endif
 675                 error = (*ifp->if_output)(ifp, m,
 676                     (const struct sockaddr *)gw, ro);
 677 #ifdef RATELIMIT
 678                 /* check for route change */
 679                 if (error == EAGAIN)
 680                         in_pcboutput_eagain(inp);
 681 #endif
 682                 goto done;
 683         }
 684
 685         /* Balk when DF bit is set or the interface didn't support TSO. */
 686         if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
 687                 error = EMSGSIZE;
 688                 IPSTAT_INC(ips_cantfrag);
 689                 goto bad;
 690         }
 691
 692         /*
 693          * Too large for interface; fragment if possible. If successful,
 694          * on return, m will point to a list of packets to be sent.
 695          */
 696         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
 697         if (error)
 698                 goto bad;
 699         for (; m; m = m0) {
 700                 m0 = m->m_nextpkt;
 701                 m->m_nextpkt = 0;
 702                 if (error == 0) {
 703                         /* Record statistics for this interface address. */
 704                         if (ia != NULL) {
 705                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 706                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 707                                     m->m_pkthdr.len);
 708                         }
 709                         /*
 710                          * Reset layer specific mbuf flags
 711                          * to avoid confusing upper layers.
 712                          */
 713                         m_clrprotoflags(m);
 714
 715                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
 716                             mtod(m, struct ip *), NULL);
 717 #ifdef RATELIMIT
 718                         if (inp != NULL) {
 719                                 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 720                                         in_pcboutput_txrtlmt(inp, ifp, m);
 721                                 /* stamp send tag on mbuf */
 722                                 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 723                         } else {
 724                                 m->m_pkthdr.snd_tag = NULL;
 725                         }
 726 #endif
 727                         error = (*ifp->if_output)(ifp, m,
 728                             (const struct sockaddr *)gw, ro);
 729 #ifdef RATELIMIT
 730                         /* check for route change */
 731                         if (error == EAGAIN)
 732                                 in_pcboutput_eagain(inp);
 733 #endif
 734                 } else
 735                         m_freem(m);
 736         }
 737
 738         if (error == 0)
 739                 IPSTAT_INC(ips_fragmented);
 740
 741 done:
 742         if (ro == &iproute)
 743                 RO_RTFREE(ro);
 744         else if (rte == NULL)
 745                 /*
 746                  * If the caller supplied a route but somehow the reference
 747                  * to it has been released need to prevent the caller
 748                  * calling RTFREE on it again.
 749                  */
 750                 ro->ro_rt = NULL;
 751         if (have_ia_ref)
 752                 ifa_free(&ia->ia_ifa);
 753         return (error);
 754 bad:
 755         m_freem(m);
 756         goto done;
 757 }
 758
 759 /*
 760  * Create a chain of fragments which fit the given mtu. m_frag points to the
 761  * mbuf to be fragmented; on return it points to the chain with the fragments.
 762  * Return 0 if no error. If error, m_frag may contain a partially built
 763  * chain of fragments that should be freed by the caller.
 764  *
 765  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
 766  */
 767 int
 768 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 769     u_long if_hwassist_flags)
 770 {
 771         int error = 0;
 772         int hlen = ip->ip_hl << 2;
 773         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
 774         int off;
 775         struct mbuf *m0 = *m_frag;      /* the original packet          */
 776         int firstlen;
 777         struct mbuf **mnext;
 778         int nfrags;
 779         uint16_t ip_len, ip_off;
 780
 781         ip_len = ntohs(ip->ip_len);
 782         ip_off = ntohs(ip->ip_off);
 783
 784         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
 785                 IPSTAT_INC(ips_cantfrag);
 786                 return EMSGSIZE;
 787         }
 788
 789         /*
 790          * Must be able to put at least 8 bytes per fragment.
 791          */
 792         if (len < 8)
 793                 return EMSGSIZE;
 794
 795         /*
 796          * If the interface will not calculate checksums on
 797          * fragmented packets, then do it here.
 798          */
 799         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 800                 in_delayed_cksum(m0);
 801                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 802         }
 803 #ifdef SCTP
 804         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
 805                 sctp_delayed_cksum(m0, hlen);
 806                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 807         }
 808 #endif
 809         if (len > PAGE_SIZE) {
 810                 /*
 811                  * Fragment large datagrams such that each segment
 812                  * contains a multiple of PAGE_SIZE amount of data,
 813                  * plus headers. This enables a receiver to perform
 814                  * page-flipping zero-copy optimizations.
 815                  *
 816                  * XXX When does this help given that sender and receiver
 817                  * could have different page sizes, and also mtu could
 818                  * be less than the receiver's page size ?
 819                  */
 820                 int newlen;
 821
 822                 off = MIN(mtu, m0->m_pkthdr.len);
 823
 824                 /*
 825                  * firstlen (off - hlen) must be aligned on an
 826                  * 8-byte boundary
 827                  */
 828                 if (off < hlen)
 829                         goto smart_frag_failure;
 830                 off = ((off - hlen) & ~7) + hlen;
 831                 newlen = (~PAGE_MASK) & mtu;
 832                 if ((newlen + sizeof (struct ip)) > mtu) {
 833                         /* we failed, go back the default */
 834 smart_frag_failure:
 835                         newlen = len;
 836                         off = hlen + len;
 837                 }
 838                 len = newlen;
 839
 840         } else {
 841                 off = hlen + len;
 842         }
 843
 844         firstlen = off - hlen;
 845         mnext = &m0->m_nextpkt;         /* pointer to next packet */
 846
 847         /*
 848          * Loop through length of segment after first fragment,
 849          * make new header and copy data of each part and link onto chain.
 850          * Here, m0 is the original packet, m is the fragment being created.
 851          * The fragments are linked off the m_nextpkt of the original
 852          * packet, which after processing serves as the first fragment.
 853          */
 854         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
 855                 struct ip *mhip;        /* ip header on the fragment */
 856                 struct mbuf *m;
 857                 int mhlen = sizeof (struct ip);
 858
 859                 m = m_gethdr(M_NOWAIT, MT_DATA);
 860                 if (m == NULL) {
 861                         error = ENOBUFS;
 862                         IPSTAT_INC(ips_odropped);
 863                         goto done;
 864                 }
 865                 /*
 866                  * Make sure the complete packet header gets copied
 867                  * from the originating mbuf to the newly created
 868                  * mbuf. This also ensures that existing firewall
 869                  * classification(s), VLAN tags and so on get copied
 870                  * to the resulting fragmented packet(s):
 871                  */
 872                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 873                         m_free(m);
 874                         error = ENOBUFS;
 875                         IPSTAT_INC(ips_odropped);
 876                         goto done;
 877                 }
 878                 /*
 879                  * In the first mbuf, leave room for the link header, then
 880                  * copy the original IP header including options. The payload
 881                  * goes into an additional mbuf chain returned by m_copym().
 882                  */
 883                 m->m_data += max_linkhdr;
 884                 mhip = mtod(m, struct ip *);
 885                 *mhip = *ip;
 886                 if (hlen > sizeof (struct ip)) {
 887                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
 888                         mhip->ip_v = IPVERSION;
 889                         mhip->ip_hl = mhlen >> 2;
 890                 }
 891                 m->m_len = mhlen;
 892                 /* XXX do we need to add ip_off below ? */
 893                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
 894                 if (off + len >= ip_len)
 895                         len = ip_len - off;
 896                 else
 897                         mhip->ip_off |= IP_MF;
 898                 mhip->ip_len = htons((u_short)(len + mhlen));
 899                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
 900                 if (m->m_next == NULL) {        /* copy failed */
 901                         m_free(m);
 902                         error = ENOBUFS;        /* ??? */
 903                         IPSTAT_INC(ips_odropped);
 904                         goto done;
 905                 }
 906                 m->m_pkthdr.len = mhlen + len;
 907 #ifdef MAC
 908                 mac_netinet_fragment(m0, m);
 909 #endif
 910                 mhip->ip_off = htons(mhip->ip_off);
 911                 mhip->ip_sum = 0;
 912                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 913                         mhip->ip_sum = in_cksum(m, mhlen);
 914                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 915                 }
 916                 *mnext = m;
 917                 mnext = &m->m_nextpkt;
 918         }
 919         IPSTAT_ADD(ips_ofragments, nfrags);
 920
 921         /*
 922          * Update first fragment by trimming what's been copied out
 923          * and updating header.
 924          */
 925         m_adj(m0, hlen + firstlen - ip_len);
 926         m0->m_pkthdr.len = hlen + firstlen;
 927         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
 928         ip->ip_off = htons(ip_off | IP_MF);
 929         ip->ip_sum = 0;
 930         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 931                 ip->ip_sum = in_cksum(m0, hlen);
 932                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
 933         }
 934
 935 done:
 936         *m_frag = m0;
 937         return error;
 938 }
 939
 940 void
 941 in_delayed_cksum(struct mbuf *m)
 942 {
 943         struct ip *ip;
 944         uint16_t csum, offset, ip_len;
 945
 946         ip = mtod(m, struct ip *);
 947         offset = ip->ip_hl << 2 ;
 948         ip_len = ntohs(ip->ip_len);
 949         csum = in_cksum_skip(m, ip_len, offset);
 950         if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
 951                 csum = 0xffff;
 952         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 953
 954         /* find the mbuf in the chain where the checksum starts*/
 955         while ((m != NULL) && (offset >= m->m_len)) {
 956                 offset -= m->m_len;
 957                 m = m->m_next;
 958         }
 959         KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain."));
 960         KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs."));
 961         *(u_short *)(m->m_data + offset) = csum;
 962 }
 963
 964 /*
 965  * IP socket option processing.
 966  */
 967 int
 968 ip_ctloutput(struct socket *so, struct sockopt *sopt)
 969 {
 970         struct  inpcb *inp = sotoinpcb(so);
 971         int     error, optval;
 972 #ifdef  RSS
 973         uint32_t rss_bucket;
 974         int retval;
 975 #endif
 976
 977         error = optval = 0;
 978         if (sopt->sopt_level != IPPROTO_IP) {
 979                 error = EINVAL;
 980
 981                 if (sopt->sopt_level == SOL_SOCKET &&
 982                     sopt->sopt_dir == SOPT_SET) {
 983                         switch (sopt->sopt_name) {
 984                         case SO_REUSEADDR:
 985                                 INP_WLOCK(inp);
 986                                 if ((so->so_options & SO_REUSEADDR) != 0)
 987                                         inp->inp_flags2 |= INP_REUSEADDR;
 988                                 else
 989                                         inp->inp_flags2 &= ~INP_REUSEADDR;
 990                                 INP_WUNLOCK(inp);
 991                                 error = 0;
 992                                 break;
 993                         case SO_REUSEPORT:
 994                                 INP_WLOCK(inp);
 995                                 if ((so->so_options & SO_REUSEPORT) != 0)
 996                                         inp->inp_flags2 |= INP_REUSEPORT;
 997                                 else
 998                                         inp->inp_flags2 &= ~INP_REUSEPORT;
 999                                 INP_WUNLOCK(inp);
1000                                 error = 0;
1001                                 break;
1002                         case SO_SETFIB:
1003                                 INP_WLOCK(inp);
1004                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
1005                                 INP_WUNLOCK(inp);
1006                                 error = 0;
1007                                 break;
1008                         case SO_MAX_PACING_RATE:
1009 #ifdef RATELIMIT
1010                                 INP_WLOCK(inp);
1011                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1012                                 INP_WUNLOCK(inp);
1013                                 error = 0;
1014 #else
1015                                 error = EOPNOTSUPP;
1016 #endif
1017                                 break;
1018                         default:
1019                                 break;
1020                         }
1021                 }
1022                 return (error);
1023         }
1024
1025         switch (sopt->sopt_dir) {
1026         case SOPT_SET:
1027                 switch (sopt->sopt_name) {
1028                 case IP_OPTIONS:
1029 #ifdef notyet
1030                 case IP_RETOPTS:
1031 #endif
1032                 {
1033                         struct mbuf *m;
1034                         if (sopt->sopt_valsize > MLEN) {
1035                                 error = EMSGSIZE;
1036                                 break;
1037                         }
1038                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1039                         if (m == NULL) {
1040                                 error = ENOBUFS;
1041                                 break;
1042                         }
1043                         m->m_len = sopt->sopt_valsize;
1044                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1045                                             m->m_len);
1046                         if (error) {
1047                                 m_free(m);
1048                                 break;
1049                         }
1050                         INP_WLOCK(inp);
1051                         error = ip_pcbopts(inp, sopt->sopt_name, m);
1052                         INP_WUNLOCK(inp);
1053                         return (error);
1054                 }
1055
1056                 case IP_BINDANY:
1057                         if (sopt->sopt_td != NULL) {
1058                                 error = priv_check(sopt->sopt_td,
1059                                     PRIV_NETINET_BINDANY);
1060                                 if (error)
1061                                         break;
1062                         }
1063                         /* FALLTHROUGH */
1064                 case IP_BINDMULTI:
1065 #ifdef  RSS
1066                 case IP_RSS_LISTEN_BUCKET:
1067 #endif
1068                 case IP_TOS:
1069                 case IP_TTL:
1070                 case IP_MINTTL:
1071                 case IP_RECVOPTS:
1072                 case IP_RECVRETOPTS:
1073                 case IP_RECVDSTADDR:
1074                 case IP_RECVTTL:
1075                 case IP_RECVIF:
1076                 case IP_ONESBCAST:
1077                 case IP_DONTFRAG:
1078                 case IP_RECVTOS:
1079                 case IP_RECVFLOWID:
1080 #ifdef  RSS
1081                 case IP_RECVRSSBUCKETID:
1082 #endif
1083                         error = sooptcopyin(sopt, &optval, sizeof optval,
1084                                             sizeof optval);
1085                         if (error)
1086                                 break;
1087
1088                         switch (sopt->sopt_name) {
1089                         case IP_TOS:
1090                                 inp->inp_ip_tos = optval;
1091                                 break;
1092
1093                         case IP_TTL:
1094                                 inp->inp_ip_ttl = optval;
1095                                 break;
1096
1097                         case IP_MINTTL:
1098                                 if (optval >= 0 && optval <= MAXTTL)
1099                                         inp->inp_ip_minttl = optval;
1100                                 else
1101                                         error = EINVAL;
1102                                 break;
1103
1104 #define OPTSET(bit) do {                                                \
1105         INP_WLOCK(inp);                                                 \
1106         if (optval)                                                     \
1107                 inp->inp_flags |= bit;                                  \
1108         else                                                            \
1109                 inp->inp_flags &= ~bit;                                 \
1110         INP_WUNLOCK(inp);                                               \
1111 } while (0)
1112
1113 #define OPTSET2(bit, val) do {                                          \
1114         INP_WLOCK(inp);                                                 \
1115         if (val)                                                        \
1116                 inp->inp_flags2 |= bit;                                 \
1117         else                                                            \
1118                 inp->inp_flags2 &= ~bit;                                \
1119         INP_WUNLOCK(inp);                                               \
1120 } while (0)
1121
1122                         case IP_RECVOPTS:
1123                                 OPTSET(INP_RECVOPTS);
1124                                 break;
1125
1126                         case IP_RECVRETOPTS:
1127                                 OPTSET(INP_RECVRETOPTS);
1128                                 break;
1129
1130                         case IP_RECVDSTADDR:
1131                                 OPTSET(INP_RECVDSTADDR);
1132                                 break;
1133
1134                         case IP_RECVTTL:
1135                                 OPTSET(INP_RECVTTL);
1136                                 break;
1137
1138                         case IP_RECVIF:
1139                                 OPTSET(INP_RECVIF);
1140                                 break;
1141
1142                         case IP_ONESBCAST:
1143                                 OPTSET(INP_ONESBCAST);
1144                                 break;
1145                         case IP_DONTFRAG:
1146                                 OPTSET(INP_DONTFRAG);
1147                                 break;
1148                         case IP_BINDANY:
1149                                 OPTSET(INP_BINDANY);
1150                                 break;
1151                         case IP_RECVTOS:
1152                                 OPTSET(INP_RECVTOS);
1153                                 break;
1154                         case IP_BINDMULTI:
1155                                 OPTSET2(INP_BINDMULTI, optval);
1156                                 break;
1157                         case IP_RECVFLOWID:
1158                                 OPTSET2(INP_RECVFLOWID, optval);
1159                                 break;
1160 #ifdef  RSS
1161                         case IP_RSS_LISTEN_BUCKET:
1162                                 if ((optval >= 0) &&
1163                                     (optval < rss_getnumbuckets())) {
1164                                         inp->inp_rss_listen_bucket = optval;
1165                                         OPTSET2(INP_RSS_BUCKET_SET, 1);
1166                                 } else {
1167                                         error = EINVAL;
1168                                 }
1169                                 break;
1170                         case IP_RECVRSSBUCKETID:
1171                                 OPTSET2(INP_RECVRSSBUCKETID, optval);
1172                                 break;
1173 #endif
1174                         }
1175                         break;
1176 #undef OPTSET
1177 #undef OPTSET2
1178
1179                 /*
1180                  * Multicast socket options are processed by the in_mcast
1181                  * module.
1182                  */
1183                 case IP_MULTICAST_IF:
1184                 case IP_MULTICAST_VIF:
1185                 case IP_MULTICAST_TTL:
1186                 case IP_MULTICAST_LOOP:
1187                 case IP_ADD_MEMBERSHIP:
1188                 case IP_DROP_MEMBERSHIP:
1189                 case IP_ADD_SOURCE_MEMBERSHIP:
1190                 case IP_DROP_SOURCE_MEMBERSHIP:
1191                 case IP_BLOCK_SOURCE:
1192                 case IP_UNBLOCK_SOURCE:
1193                 case IP_MSFILTER:
1194                 case MCAST_JOIN_GROUP:
1195                 case MCAST_LEAVE_GROUP:
1196                 case MCAST_JOIN_SOURCE_GROUP:
1197                 case MCAST_LEAVE_SOURCE_GROUP:
1198                 case MCAST_BLOCK_SOURCE:
1199                 case MCAST_UNBLOCK_SOURCE:
1200                         error = inp_setmoptions(inp, sopt);
1201                         break;
1202
1203                 case IP_PORTRANGE:
1204                         error = sooptcopyin(sopt, &optval, sizeof optval,
1205                                             sizeof optval);
1206                         if (error)
1207                                 break;
1208
1209                         INP_WLOCK(inp);
1210                         switch (optval) {
1211                         case IP_PORTRANGE_DEFAULT:
1212                                 inp->inp_flags &= ~(INP_LOWPORT);
1213                                 inp->inp_flags &= ~(INP_HIGHPORT);
1214                                 break;
1215
1216                         case IP_PORTRANGE_HIGH:
1217                                 inp->inp_flags &= ~(INP_LOWPORT);
1218                                 inp->inp_flags |= INP_HIGHPORT;
1219                                 break;
1220
1221                         case IP_PORTRANGE_LOW:
1222                                 inp->inp_flags &= ~(INP_HIGHPORT);
1223                                 inp->inp_flags |= INP_LOWPORT;
1224                                 break;
1225
1226                         default:
1227                                 error = EINVAL;
1228                                 break;
1229                         }
1230                         INP_WUNLOCK(inp);
1231                         break;
1232
1233 #ifdef IPSEC
1234                 case IP_IPSEC_POLICY:
1235                 {
1236                         caddr_t req;
1237                         struct mbuf *m;
1238
1239                         if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1240                                 break;
1241                         if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1242                                 break;
1243                         req = mtod(m, caddr_t);
1244                         error = ipsec_set_policy(inp, sopt->sopt_name, req,
1245                             m->m_len, (sopt->sopt_td != NULL) ?
1246                             sopt->sopt_td->td_ucred : NULL);
1247                         m_freem(m);
1248                         break;
1249                 }
1250 #endif /* IPSEC */
1251
1252                 default:
1253                         error = ENOPROTOOPT;
1254                         break;
1255                 }
1256                 break;
1257
1258         case SOPT_GET:
1259                 switch (sopt->sopt_name) {
1260                 case IP_OPTIONS:
1261                 case IP_RETOPTS:
1262                         if (inp->inp_options)
1263                                 error = sooptcopyout(sopt,
1264                                                      mtod(inp->inp_options,
1265                                                           char *),
1266                                                      inp->inp_options->m_len);
1267                         else
1268                                 sopt->sopt_valsize = 0;
1269                         break;
1270
1271                 case IP_TOS:
1272                 case IP_TTL:
1273                 case IP_MINTTL:
1274                 case IP_RECVOPTS:
1275                 case IP_RECVRETOPTS:
1276                 case IP_RECVDSTADDR:
1277                 case IP_RECVTTL:
1278                 case IP_RECVIF:
1279                 case IP_PORTRANGE:
1280                 case IP_ONESBCAST:
1281                 case IP_DONTFRAG:
1282                 case IP_BINDANY:
1283                 case IP_RECVTOS:
1284                 case IP_BINDMULTI:
1285                 case IP_FLOWID:
1286                 case IP_FLOWTYPE:
1287                 case IP_RECVFLOWID:
1288 #ifdef  RSS
1289                 case IP_RSSBUCKETID:
1290                 case IP_RECVRSSBUCKETID:
1291 #endif
1292                         switch (sopt->sopt_name) {
1293
1294                         case IP_TOS:
1295                                 optval = inp->inp_ip_tos;
1296                                 break;
1297
1298                         case IP_TTL:
1299                                 optval = inp->inp_ip_ttl;
1300                                 break;
1301
1302                         case IP_MINTTL:
1303                                 optval = inp->inp_ip_minttl;
1304                                 break;
1305
1306 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
1307 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
1308
1309                         case IP_RECVOPTS:
1310                                 optval = OPTBIT(INP_RECVOPTS);
1311                                 break;
1312
1313                         case IP_RECVRETOPTS:
1314                                 optval = OPTBIT(INP_RECVRETOPTS);
1315                                 break;
1316
1317                         case IP_RECVDSTADDR:
1318                                 optval = OPTBIT(INP_RECVDSTADDR);
1319                                 break;
1320
1321                         case IP_RECVTTL:
1322                                 optval = OPTBIT(INP_RECVTTL);
1323                                 break;
1324
1325                         case IP_RECVIF:
1326                                 optval = OPTBIT(INP_RECVIF);
1327                                 break;
1328
1329                         case IP_PORTRANGE:
1330                                 if (inp->inp_flags & INP_HIGHPORT)
1331                                         optval = IP_PORTRANGE_HIGH;
1332                                 else if (inp->inp_flags & INP_LOWPORT)
1333                                         optval = IP_PORTRANGE_LOW;
1334                                 else
1335                                         optval = 0;
1336                                 break;
1337
1338                         case IP_ONESBCAST:
1339                                 optval = OPTBIT(INP_ONESBCAST);
1340                                 break;
1341                         case IP_DONTFRAG:
1342                                 optval = OPTBIT(INP_DONTFRAG);
1343                                 break;
1344                         case IP_BINDANY:
1345                                 optval = OPTBIT(INP_BINDANY);
1346                                 break;
1347                         case IP_RECVTOS:
1348                                 optval = OPTBIT(INP_RECVTOS);
1349                                 break;
1350                         case IP_FLOWID:
1351                                 optval = inp->inp_flowid;
1352                                 break;
1353                         case IP_FLOWTYPE:
1354                                 optval = inp->inp_flowtype;
1355                                 break;
1356                         case IP_RECVFLOWID:
1357                                 optval = OPTBIT2(INP_RECVFLOWID);
1358                                 break;
1359 #ifdef  RSS
1360                         case IP_RSSBUCKETID:
1361                                 retval = rss_hash2bucket(inp->inp_flowid,
1362                                     inp->inp_flowtype,
1363                                     &rss_bucket);
1364                                 if (retval == 0)
1365                                         optval = rss_bucket;
1366                                 else
1367                                         error = EINVAL;
1368                                 break;
1369                         case IP_RECVRSSBUCKETID:
1370                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1371                                 break;
1372 #endif
1373                         case IP_BINDMULTI:
1374                                 optval = OPTBIT2(INP_BINDMULTI);
1375                                 break;
1376                         }
1377                         error = sooptcopyout(sopt, &optval, sizeof optval);
1378                         break;
1379
1380                 /*
1381                  * Multicast socket options are processed by the in_mcast
1382                  * module.
1383                  */
1384                 case IP_MULTICAST_IF:
1385                 case IP_MULTICAST_VIF:
1386                 case IP_MULTICAST_TTL:
1387                 case IP_MULTICAST_LOOP:
1388                 case IP_MSFILTER:
1389                         error = inp_getmoptions(inp, sopt);
1390                         break;
1391
1392 #ifdef IPSEC
1393                 case IP_IPSEC_POLICY:
1394                 {
1395                         struct mbuf *m = NULL;
1396                         caddr_t req = NULL;
1397                         size_t len = 0;
1398
1399                         if (m != NULL) {
1400                                 req = mtod(m, caddr_t);
1401                                 len = m->m_len;
1402                         }
1403                         error = ipsec_get_policy(sotoinpcb(so), req, len, &m);
1404                         if (error == 0)
1405                                 error = soopt_mcopyout(sopt, m); /* XXX */
1406                         if (error == 0)
1407                                 m_freem(m);
1408                         break;
1409                 }
1410 #endif /* IPSEC */
1411
1412                 default:
1413                         error = ENOPROTOOPT;
1414                         break;
1415                 }
1416                 break;
1417         }
1418         return (error);
1419 }
1420
1421 /*
1422  * Routine called from ip_output() to loop back a copy of an IP multicast
1423  * packet to the input queue of a specified interface.  Note that this
1424  * calls the output routine of the loopback "driver", but with an interface
1425  * pointer that might NOT be a loopback interface -- evil, but easier than
1426  * replicating that code here.
1427  */
1428 static void
1429 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1430 {
1431         struct ip *ip;
1432         struct mbuf *copym;
1433
1434         /*
1435          * Make a deep copy of the packet because we're going to
1436          * modify the pack in order to generate checksums.
1437          */
1438         copym = m_dup(m, M_NOWAIT);
1439         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1440                 copym = m_pullup(copym, hlen);
1441         if (copym != NULL) {
1442                 /* If needed, compute the checksum and mark it as valid. */
1443                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1444                         in_delayed_cksum(copym);
1445                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1446                         copym->m_pkthdr.csum_flags |=
1447                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1448                         copym->m_pkthdr.csum_data = 0xffff;
1449                 }
1450                 /*
1451                  * We don't bother to fragment if the IP length is greater
1452                  * than the interface's MTU.  Can this possibly matter?
1453                  */
1454                 ip = mtod(copym, struct ip *);
1455                 ip->ip_sum = 0;
1456                 ip->ip_sum = in_cksum(copym, hlen);
1457                 if_simloop(ifp, copym, AF_INET, 0);
1458         }
1459 }