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  * 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  *      @(#)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 #include <netipsec/ipsec_support.h>
  88
  89 #include <machine/in_cksum.h>
  90
  91 #include <security/mac/mac_framework.h>
  92
  93 #ifdef MBUF_STRESS_TEST
  94 static int mbuf_frag_size = 0;
  95 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
  96         &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
  97 #endif
  98
  99 static void     ip_mloopback(struct ifnet *, const struct mbuf *, int);
 100
 101
 102 extern int in_mcast_loop;
 103 extern  struct protosw inetsw[];
 104
 105 static inline int
 106 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp,
 107     struct sockaddr_in *dst, int *fibnum, int *error)
 108 {
 109         struct m_tag *fwd_tag = NULL;
 110         struct mbuf *m;
 111         struct in_addr odst;
 112         struct ip *ip;
 113
 114         m = *mp;
 115         ip = mtod(m, struct ip *);
 116
 117         /* Run through list of hooks for output packets. */
 118         odst.s_addr = ip->ip_dst.s_addr;
 119         *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, inp);
 120         m = *mp;
 121         if ((*error) != 0 || m == NULL)
 122                 return 1; /* Finished */
 123
 124         ip = mtod(m, struct ip *);
 125
 126         /* See if destination IP address was changed by packet filter. */
 127         if (odst.s_addr != ip->ip_dst.s_addr) {
 128                 m->m_flags |= M_SKIP_FIREWALL;
 129                 /* If destination is now ourself drop to ip_input(). */
 130                 if (in_localip(ip->ip_dst)) {
 131                         m->m_flags |= M_FASTFWD_OURS;
 132                         if (m->m_pkthdr.rcvif == NULL)
 133                                 m->m_pkthdr.rcvif = V_loif;
 134                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 135                                 m->m_pkthdr.csum_flags |=
 136                                         CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 137                                 m->m_pkthdr.csum_data = 0xffff;
 138                         }
 139                         m->m_pkthdr.csum_flags |=
 140                                 CSUM_IP_CHECKED | CSUM_IP_VALID;
 141 #ifdef SCTP
 142                         if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 143                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 144 #endif
 145                         *error = netisr_queue(NETISR_IP, m);
 146                         return 1; /* Finished */
 147                 }
 148
 149                 bzero(dst, sizeof(*dst));
 150                 dst->sin_family = AF_INET;
 151                 dst->sin_len = sizeof(*dst);
 152                 dst->sin_addr = ip->ip_dst;
 153
 154                 return -1; /* Reloop */
 155         }
 156         /* See if fib was changed by packet filter. */
 157         if ((*fibnum) != M_GETFIB(m)) {
 158                 m->m_flags |= M_SKIP_FIREWALL;
 159                 *fibnum = M_GETFIB(m);
 160                 return -1; /* Reloop for FIB change */
 161         }
 162
 163         /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
 164         if (m->m_flags & M_FASTFWD_OURS) {
 165                 if (m->m_pkthdr.rcvif == NULL)
 166                         m->m_pkthdr.rcvif = V_loif;
 167                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 168                         m->m_pkthdr.csum_flags |=
 169                                 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 170                         m->m_pkthdr.csum_data = 0xffff;
 171                 }
 172 #ifdef SCTP
 173                 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 174                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 175 #endif
 176                 m->m_pkthdr.csum_flags |=
 177                         CSUM_IP_CHECKED | CSUM_IP_VALID;
 178
 179                 *error = netisr_queue(NETISR_IP, m);
 180                 return 1; /* Finished */
 181         }
 182         /* Or forward to some other address? */
 183         if ((m->m_flags & M_IP_NEXTHOP) &&
 184             ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
 185                 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
 186                 m->m_flags |= M_SKIP_FIREWALL;
 187                 m->m_flags &= ~M_IP_NEXTHOP;
 188                 m_tag_delete(m, fwd_tag);
 189
 190                 return -1; /* Reloop for CHANGE of dst */
 191         }
 192
 193         return 0;
 194 }
 195
 196 /*
 197  * IP output.  The packet in mbuf chain m contains a skeletal IP
 198  * header (with len, off, ttl, proto, tos, src, dst).
 199  * The mbuf chain containing the packet will be freed.
 200  * The mbuf opt, if present, will not be freed.
 201  * If route ro is present and has ro_rt initialized, route lookup would be
 202  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 203  * then result of route lookup is stored in ro->ro_rt.
 204  *
 205  * In the IP forwarding case, the packet will arrive with options already
 206  * inserted, so must have a NULL opt pointer.
 207  */
 208 int
 209 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 210     struct ip_moptions *imo, struct inpcb *inp)
 211 {
 212         struct rm_priotracker in_ifa_tracker;
 213         struct ip *ip;
 214         struct ifnet *ifp = NULL;       /* keep compiler happy */
 215         struct mbuf *m0;
 216         int hlen = sizeof (struct ip);
 217         int mtu;
 218         int error = 0;
 219         struct sockaddr_in *dst;
 220         const struct sockaddr_in *gw;
 221         struct in_ifaddr *ia;
 222         int isbroadcast;
 223         uint16_t ip_len, ip_off;
 224         struct route iproute;
 225         struct rtentry *rte;    /* cache for ro->ro_rt */
 226         uint32_t fibnum;
 227         int have_ia_ref;
 228 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 229         int no_route_but_check_spd = 0;
 230 #endif
 231         M_ASSERTPKTHDR(m);
 232
 233         if (inp != NULL) {
 234                 INP_LOCK_ASSERT(inp);
 235                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 236                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 237                         m->m_pkthdr.flowid = inp->inp_flowid;
 238                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 239                 }
 240         }
 241
 242         if (ro == NULL) {
 243                 ro = &iproute;
 244                 bzero(ro, sizeof (*ro));
 245         } else
 246                 ro->ro_flags |= RT_LLE_CACHE;
 247
 248 #ifdef FLOWTABLE
 249         if (ro->ro_rt == NULL)
 250                 (void )flowtable_lookup(AF_INET, m, ro);
 251 #endif
 252
 253         if (opt) {
 254                 int len = 0;
 255                 m = ip_insertoptions(m, opt, &len);
 256                 if (len != 0)
 257                         hlen = len; /* ip->ip_hl is updated above */
 258         }
 259         ip = mtod(m, struct ip *);
 260         ip_len = ntohs(ip->ip_len);
 261         ip_off = ntohs(ip->ip_off);
 262
 263         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
 264                 ip->ip_v = IPVERSION;
 265                 ip->ip_hl = hlen >> 2;
 266                 ip_fillid(ip);
 267                 IPSTAT_INC(ips_localout);
 268         } else {
 269                 /* Header already set, fetch hlen from there */
 270                 hlen = ip->ip_hl << 2;
 271         }
 272
 273         /*
 274          * dst/gw handling:
 275          *
 276          * dst can be rewritten but always points to &ro->ro_dst.
 277          * gw is readonly but can point either to dst OR rt_gateway,
 278          * therefore we need restore gw if we're redoing lookup.
 279          */
 280         gw = dst = (struct sockaddr_in *)&ro->ro_dst;
 281         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 282         rte = ro->ro_rt;
 283         if (rte == NULL) {
 284                 bzero(dst, sizeof(*dst));
 285                 dst->sin_family = AF_INET;
 286                 dst->sin_len = sizeof(*dst);
 287                 dst->sin_addr = ip->ip_dst;
 288         }
 289 again:
 290         /*
 291          * Validate route against routing table additions;
 292          * a better/more specific route might have been added.
 293          */
 294         if (inp)
 295                 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
 296         /*
 297          * If there is a cached route,
 298          * check that it is to the same destination
 299          * and is still up.  If not, free it and try again.
 300          * The address family should also be checked in case of sharing the
 301          * cache with IPv6.
 302          * Also check whether routing cache needs invalidation.
 303          */
 304         rte = ro->ro_rt;
 305         if (rte && ((rte->rt_flags & RTF_UP) == 0 ||
 306                     rte->rt_ifp == NULL ||
 307                     !RT_LINK_IS_UP(rte->rt_ifp) ||
 308                           dst->sin_family != AF_INET ||
 309                           dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
 310                 RTFREE(rte);
 311                 rte = ro->ro_rt = (struct rtentry *)NULL;
 312                 if (ro->ro_lle)
 313                         LLE_FREE(ro->ro_lle);   /* zeros ro_lle */
 314                 ro->ro_lle = (struct llentry *)NULL;
 315         }
 316         ia = NULL;
 317         have_ia_ref = 0;
 318         /*
 319          * If routing to interface only, short circuit routing lookup.
 320          * The use of an all-ones broadcast address implies this; an
 321          * interface is specified by the broadcast address of an interface,
 322          * or the destination address of a ptp interface.
 323          */
 324         if (flags & IP_SENDONES) {
 325                 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
 326                                                       M_GETFIB(m)))) == NULL &&
 327                     (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 328                                                     M_GETFIB(m)))) == NULL) {
 329                         IPSTAT_INC(ips_noroute);
 330                         error = ENETUNREACH;
 331                         goto bad;
 332                 }
 333                 have_ia_ref = 1;
 334                 ip->ip_dst.s_addr = INADDR_BROADCAST;
 335                 dst->sin_addr = ip->ip_dst;
 336                 ifp = ia->ia_ifp;
 337                 ip->ip_ttl = 1;
 338                 isbroadcast = 1;
 339         } else if (flags & IP_ROUTETOIF) {
 340                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 341                                                     M_GETFIB(m)))) == NULL &&
 342                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
 343                                                 M_GETFIB(m)))) == NULL) {
 344                         IPSTAT_INC(ips_noroute);
 345                         error = ENETUNREACH;
 346                         goto bad;
 347                 }
 348                 have_ia_ref = 1;
 349                 ifp = ia->ia_ifp;
 350                 ip->ip_ttl = 1;
 351                 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
 352                     in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
 353         } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
 354             imo != NULL && imo->imo_multicast_ifp != NULL) {
 355                 /*
 356                  * Bypass the normal routing lookup for multicast
 357                  * packets if the interface is specified.
 358                  */
 359                 ifp = imo->imo_multicast_ifp;
 360                 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
 361                 if (ia)
 362                         have_ia_ref = 1;
 363                 isbroadcast = 0;        /* fool gcc */
 364         } else {
 365                 /*
 366                  * We want to do any cloning requested by the link layer,
 367                  * as this is probably required in all cases for correct
 368                  * operation (as it is for ARP).
 369                  */
 370                 if (rte == NULL) {
 371 #ifdef RADIX_MPATH
 372                         rtalloc_mpath_fib(ro,
 373                             ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
 374                             fibnum);
 375 #else
 376                         in_rtalloc_ign(ro, 0, fibnum);
 377 #endif
 378                         rte = ro->ro_rt;
 379                 }
 380                 if (rte == NULL ||
 381                     (rte->rt_flags & RTF_UP) == 0 ||
 382                     rte->rt_ifp == NULL ||
 383                     !RT_LINK_IS_UP(rte->rt_ifp)) {
 384 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 385                         /*
 386                          * There is no route for this packet, but it is
 387                          * possible that a matching SPD entry exists.
 388                          */
 389                         no_route_but_check_spd = 1;
 390                         mtu = 0; /* Silence GCC warning. */
 391                         goto sendit;
 392 #endif
 393                         IPSTAT_INC(ips_noroute);
 394                         error = EHOSTUNREACH;
 395                         goto bad;
 396                 }
 397                 ia = ifatoia(rte->rt_ifa);
 398                 ifp = rte->rt_ifp;
 399                 counter_u64_add(rte->rt_pksent, 1);
 400                 rt_update_ro_flags(ro);
 401                 if (rte->rt_flags & RTF_GATEWAY)
 402                         gw = (struct sockaddr_in *)rte->rt_gateway;
 403                 if (rte->rt_flags & RTF_HOST)
 404                         isbroadcast = (rte->rt_flags & RTF_BROADCAST);
 405                 else if (ifp->if_flags & IFF_BROADCAST)
 406                         isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
 407                 else
 408                         isbroadcast = 0;
 409         }
 410
 411         /*
 412          * Calculate MTU.  If we have a route that is up, use that,
 413          * otherwise use the interface's MTU.
 414          */
 415         if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
 416                 mtu = rte->rt_mtu;
 417         else
 418                 mtu = ifp->if_mtu;
 419         /* Catch a possible divide by zero later. */
 420         KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
 421             __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
 422
 423         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 424                 m->m_flags |= M_MCAST;
 425                 /*
 426                  * IP destination address is multicast.  Make sure "gw"
 427                  * still points to the address in "ro".  (It may have been
 428                  * changed to point to a gateway address, above.)
 429                  */
 430                 gw = dst;
 431                 /*
 432                  * See if the caller provided any multicast options
 433                  */
 434                 if (imo != NULL) {
 435                         ip->ip_ttl = imo->imo_multicast_ttl;
 436                         if (imo->imo_multicast_vif != -1)
 437                                 ip->ip_src.s_addr =
 438                                     ip_mcast_src ?
 439                                     ip_mcast_src(imo->imo_multicast_vif) :
 440                                     INADDR_ANY;
 441                 } else
 442                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
 443                 /*
 444                  * Confirm that the outgoing interface supports multicast.
 445                  */
 446                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
 447                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
 448                                 IPSTAT_INC(ips_noroute);
 449                                 error = ENETUNREACH;
 450                                 goto bad;
 451                         }
 452                 }
 453                 /*
 454                  * If source address not specified yet, use address
 455                  * of outgoing interface.
 456                  */
 457                 if (ip->ip_src.s_addr == INADDR_ANY) {
 458                         /* Interface may have no addresses. */
 459                         if (ia != NULL)
 460                                 ip->ip_src = IA_SIN(ia)->sin_addr;
 461                 }
 462
 463                 if ((imo == NULL && in_mcast_loop) ||
 464                     (imo && imo->imo_multicast_loop)) {
 465                         /*
 466                          * Loop back multicast datagram if not expressly
 467                          * forbidden to do so, even if we are not a member
 468                          * of the group; ip_input() will filter it later,
 469                          * thus deferring a hash lookup and mutex acquisition
 470                          * at the expense of a cheap copy using m_copym().
 471                          */
 472                         ip_mloopback(ifp, m, hlen);
 473                 } else {
 474                         /*
 475                          * If we are acting as a multicast router, perform
 476                          * multicast forwarding as if the packet had just
 477                          * arrived on the interface to which we are about
 478                          * to send.  The multicast forwarding function
 479                          * recursively calls this function, using the
 480                          * IP_FORWARDING flag to prevent infinite recursion.
 481                          *
 482                          * Multicasts that are looped back by ip_mloopback(),
 483                          * above, will be forwarded by the ip_input() routine,
 484                          * if necessary.
 485                          */
 486                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
 487                                 /*
 488                                  * If rsvp daemon is not running, do not
 489                                  * set ip_moptions. This ensures that the packet
 490                                  * is multicast and not just sent down one link
 491                                  * as prescribed by rsvpd.
 492                                  */
 493                                 if (!V_rsvp_on)
 494                                         imo = NULL;
 495                                 if (ip_mforward &&
 496                                     ip_mforward(ip, ifp, m, imo) != 0) {
 497                                         m_freem(m);
 498                                         goto done;
 499                                 }
 500                         }
 501                 }
 502
 503                 /*
 504                  * Multicasts with a time-to-live of zero may be looped-
 505                  * back, above, but must not be transmitted on a network.
 506                  * Also, multicasts addressed to the loopback interface
 507                  * are not sent -- the above call to ip_mloopback() will
 508                  * loop back a copy. ip_input() will drop the copy if
 509                  * this host does not belong to the destination group on
 510                  * the loopback interface.
 511                  */
 512                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
 513                         m_freem(m);
 514                         goto done;
 515                 }
 516
 517                 goto sendit;
 518         }
 519
 520         /*
 521          * If the source address is not specified yet, use the address
 522          * of the outoing interface.
 523          */
 524         if (ip->ip_src.s_addr == INADDR_ANY) {
 525                 /* Interface may have no addresses. */
 526                 if (ia != NULL) {
 527                         ip->ip_src = IA_SIN(ia)->sin_addr;
 528                 }
 529         }
 530
 531         /*
 532          * Look for broadcast address and
 533          * verify user is allowed to send
 534          * such a packet.
 535          */
 536         if (isbroadcast) {
 537                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 538                         error = EADDRNOTAVAIL;
 539                         goto bad;
 540                 }
 541                 if ((flags & IP_ALLOWBROADCAST) == 0) {
 542                         error = EACCES;
 543                         goto bad;
 544                 }
 545                 /* don't allow broadcast messages to be fragmented */
 546                 if (ip_len > mtu) {
 547                         error = EMSGSIZE;
 548                         goto bad;
 549                 }
 550                 m->m_flags |= M_BCAST;
 551         } else {
 552                 m->m_flags &= ~M_BCAST;
 553         }
 554
 555 sendit:
 556 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 557         if (IPSEC_ENABLED(ipv4)) {
 558                 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
 559                         if (error == EINPROGRESS)
 560                                 error = 0;
 561                         goto done;
 562                 }
 563         }
 564         /*
 565          * Check if there was a route for this packet; return error if not.
 566          */
 567         if (no_route_but_check_spd) {
 568                 IPSTAT_INC(ips_noroute);
 569                 error = EHOSTUNREACH;
 570                 goto bad;
 571         }
 572         /* Update variables that are affected by ipsec4_output(). */
 573         ip = mtod(m, struct ip *);
 574         hlen = ip->ip_hl << 2;
 575 #endif /* IPSEC */
 576
 577         /* Jump over all PFIL processing if hooks are not active. */
 578         if (PFIL_HOOKED(&V_inet_pfil_hook)) {
 579                 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
 580                 case 1: /* Finished */
 581                         goto done;
 582
 583                 case 0: /* Continue normally */
 584                         ip = mtod(m, struct ip *);
 585                         break;
 586
 587                 case -1: /* Need to try again */
 588                         /* Reset everything for a new round */
 589                         RO_RTFREE(ro);
 590                         if (have_ia_ref)
 591                                 ifa_free(&ia->ia_ifa);
 592                         ro->ro_prepend = NULL;
 593                         rte = NULL;
 594                         gw = dst;
 595                         ip = mtod(m, struct ip *);
 596                         goto again;
 597
 598                 }
 599         }
 600
 601         /* 127/8 must not appear on wire - RFC1122. */
 602         if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
 603             (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
 604                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
 605                         IPSTAT_INC(ips_badaddr);
 606                         error = EADDRNOTAVAIL;
 607                         goto bad;
 608                 }
 609         }
 610
 611         m->m_pkthdr.csum_flags |= CSUM_IP;
 612         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
 613                 in_delayed_cksum(m);
 614                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 615         }
 616 #ifdef SCTP
 617         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
 618                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
 619                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 620         }
 621 #endif
 622
 623         /*
 624          * If small enough for interface, or the interface will take
 625          * care of the fragmentation for us, we can just send directly.
 626          */
 627         if (ip_len <= mtu ||
 628             (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
 629                 ip->ip_sum = 0;
 630                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
 631                         ip->ip_sum = in_cksum(m, hlen);
 632                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 633                 }
 634
 635                 /*
 636                  * Record statistics for this interface address.
 637                  * With CSUM_TSO the byte/packet count will be slightly
 638                  * incorrect because we count the IP+TCP headers only
 639                  * once instead of for every generated packet.
 640                  */
 641                 if (!(flags & IP_FORWARDING) && ia) {
 642                         if (m->m_pkthdr.csum_flags & CSUM_TSO)
 643                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
 644                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
 645                         else
 646                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 647
 648                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
 649                 }
 650 #ifdef MBUF_STRESS_TEST
 651                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
 652                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
 653 #endif
 654                 /*
 655                  * Reset layer specific mbuf flags
 656                  * to avoid confusing lower layers.
 657                  */
 658                 m_clrprotoflags(m);
 659                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
 660 #ifdef RATELIMIT
 661                 if (inp != NULL) {
 662                         if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 663                                 in_pcboutput_txrtlmt(inp, ifp, m);
 664                         /* stamp send tag on mbuf */
 665                         m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 666                 } else {
 667                         m->m_pkthdr.snd_tag = NULL;
 668                 }
 669 #endif
 670                 error = (*ifp->if_output)(ifp, m,
 671                     (const struct sockaddr *)gw, ro);
 672 #ifdef RATELIMIT
 673                 /* check for route change */
 674                 if (error == EAGAIN)
 675                         in_pcboutput_eagain(inp);
 676 #endif
 677                 goto done;
 678         }
 679
 680         /* Balk when DF bit is set or the interface didn't support TSO. */
 681         if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
 682                 error = EMSGSIZE;
 683                 IPSTAT_INC(ips_cantfrag);
 684                 goto bad;
 685         }
 686
 687         /*
 688          * Too large for interface; fragment if possible. If successful,
 689          * on return, m will point to a list of packets to be sent.
 690          */
 691         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
 692         if (error)
 693                 goto bad;
 694         for (; m; m = m0) {
 695                 m0 = m->m_nextpkt;
 696                 m->m_nextpkt = 0;
 697                 if (error == 0) {
 698                         /* Record statistics for this interface address. */
 699                         if (ia != NULL) {
 700                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 701                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 702                                     m->m_pkthdr.len);
 703                         }
 704                         /*
 705                          * Reset layer specific mbuf flags
 706                          * to avoid confusing upper layers.
 707                          */
 708                         m_clrprotoflags(m);
 709
 710                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
 711                             mtod(m, struct ip *), NULL);
 712 #ifdef RATELIMIT
 713                         if (inp != NULL) {
 714                                 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 715                                         in_pcboutput_txrtlmt(inp, ifp, m);
 716                                 /* stamp send tag on mbuf */
 717                                 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 718                         } else {
 719                                 m->m_pkthdr.snd_tag = NULL;
 720                         }
 721 #endif
 722                         error = (*ifp->if_output)(ifp, m,
 723                             (const struct sockaddr *)gw, ro);
 724 #ifdef RATELIMIT
 725                         /* check for route change */
 726                         if (error == EAGAIN)
 727                                 in_pcboutput_eagain(inp);
 728 #endif
 729                 } else
 730                         m_freem(m);
 731         }
 732
 733         if (error == 0)
 734                 IPSTAT_INC(ips_fragmented);
 735
 736 done:
 737         if (ro == &iproute)
 738                 RO_RTFREE(ro);
 739         else if (rte == NULL)
 740                 /*
 741                  * If the caller supplied a route but somehow the reference
 742                  * to it has been released need to prevent the caller
 743                  * calling RTFREE on it again.
 744                  */
 745                 ro->ro_rt = NULL;
 746         if (have_ia_ref)
 747                 ifa_free(&ia->ia_ifa);
 748         return (error);
 749 bad:
 750         m_freem(m);
 751         goto done;
 752 }
 753
 754 /*
 755  * Create a chain of fragments which fit the given mtu. m_frag points to the
 756  * mbuf to be fragmented; on return it points to the chain with the fragments.
 757  * Return 0 if no error. If error, m_frag may contain a partially built
 758  * chain of fragments that should be freed by the caller.
 759  *
 760  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
 761  */
 762 int
 763 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 764     u_long if_hwassist_flags)
 765 {
 766         int error = 0;
 767         int hlen = ip->ip_hl << 2;
 768         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
 769         int off;
 770         struct mbuf *m0 = *m_frag;      /* the original packet          */
 771         int firstlen;
 772         struct mbuf **mnext;
 773         int nfrags;
 774         uint16_t ip_len, ip_off;
 775
 776         ip_len = ntohs(ip->ip_len);
 777         ip_off = ntohs(ip->ip_off);
 778
 779         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
 780                 IPSTAT_INC(ips_cantfrag);
 781                 return EMSGSIZE;
 782         }
 783
 784         /*
 785          * Must be able to put at least 8 bytes per fragment.
 786          */
 787         if (len < 8)
 788                 return EMSGSIZE;
 789
 790         /*
 791          * If the interface will not calculate checksums on
 792          * fragmented packets, then do it here.
 793          */
 794         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 795                 in_delayed_cksum(m0);
 796                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 797         }
 798 #ifdef SCTP
 799         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
 800                 sctp_delayed_cksum(m0, hlen);
 801                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 802         }
 803 #endif
 804         if (len > PAGE_SIZE) {
 805                 /*
 806                  * Fragment large datagrams such that each segment
 807                  * contains a multiple of PAGE_SIZE amount of data,
 808                  * plus headers. This enables a receiver to perform
 809                  * page-flipping zero-copy optimizations.
 810                  *
 811                  * XXX When does this help given that sender and receiver
 812                  * could have different page sizes, and also mtu could
 813                  * be less than the receiver's page size ?
 814                  */
 815                 int newlen;
 816
 817                 off = MIN(mtu, m0->m_pkthdr.len);
 818
 819                 /*
 820                  * firstlen (off - hlen) must be aligned on an
 821                  * 8-byte boundary
 822                  */
 823                 if (off < hlen)
 824                         goto smart_frag_failure;
 825                 off = ((off - hlen) & ~7) + hlen;
 826                 newlen = (~PAGE_MASK) & mtu;
 827                 if ((newlen + sizeof (struct ip)) > mtu) {
 828                         /* we failed, go back the default */
 829 smart_frag_failure:
 830                         newlen = len;
 831                         off = hlen + len;
 832                 }
 833                 len = newlen;
 834
 835         } else {
 836                 off = hlen + len;
 837         }
 838
 839         firstlen = off - hlen;
 840         mnext = &m0->m_nextpkt;         /* pointer to next packet */
 841
 842         /*
 843          * Loop through length of segment after first fragment,
 844          * make new header and copy data of each part and link onto chain.
 845          * Here, m0 is the original packet, m is the fragment being created.
 846          * The fragments are linked off the m_nextpkt of the original
 847          * packet, which after processing serves as the first fragment.
 848          */
 849         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
 850                 struct ip *mhip;        /* ip header on the fragment */
 851                 struct mbuf *m;
 852                 int mhlen = sizeof (struct ip);
 853
 854                 m = m_gethdr(M_NOWAIT, MT_DATA);
 855                 if (m == NULL) {
 856                         error = ENOBUFS;
 857                         IPSTAT_INC(ips_odropped);
 858                         goto done;
 859                 }
 860                 /*
 861                  * Make sure the complete packet header gets copied
 862                  * from the originating mbuf to the newly created
 863                  * mbuf. This also ensures that existing firewall
 864                  * classification(s), VLAN tags and so on get copied
 865                  * to the resulting fragmented packet(s):
 866                  */
 867                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 868                         m_free(m);
 869                         error = ENOBUFS;
 870                         IPSTAT_INC(ips_odropped);
 871                         goto done;
 872                 }
 873                 /*
 874                  * In the first mbuf, leave room for the link header, then
 875                  * copy the original IP header including options. The payload
 876                  * goes into an additional mbuf chain returned by m_copym().
 877                  */
 878                 m->m_data += max_linkhdr;
 879                 mhip = mtod(m, struct ip *);
 880                 *mhip = *ip;
 881                 if (hlen > sizeof (struct ip)) {
 882                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
 883                         mhip->ip_v = IPVERSION;
 884                         mhip->ip_hl = mhlen >> 2;
 885                 }
 886                 m->m_len = mhlen;
 887                 /* XXX do we need to add ip_off below ? */
 888                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
 889                 if (off + len >= ip_len)
 890                         len = ip_len - off;
 891                 else
 892                         mhip->ip_off |= IP_MF;
 893                 mhip->ip_len = htons((u_short)(len + mhlen));
 894                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
 895                 if (m->m_next == NULL) {        /* copy failed */
 896                         m_free(m);
 897                         error = ENOBUFS;        /* ??? */
 898                         IPSTAT_INC(ips_odropped);
 899                         goto done;
 900                 }
 901                 m->m_pkthdr.len = mhlen + len;
 902 #ifdef MAC
 903                 mac_netinet_fragment(m0, m);
 904 #endif
 905                 mhip->ip_off = htons(mhip->ip_off);
 906                 mhip->ip_sum = 0;
 907                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 908                         mhip->ip_sum = in_cksum(m, mhlen);
 909                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 910                 }
 911                 *mnext = m;
 912                 mnext = &m->m_nextpkt;
 913         }
 914         IPSTAT_ADD(ips_ofragments, nfrags);
 915
 916         /*
 917          * Update first fragment by trimming what's been copied out
 918          * and updating header.
 919          */
 920         m_adj(m0, hlen + firstlen - ip_len);
 921         m0->m_pkthdr.len = hlen + firstlen;
 922         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
 923         ip->ip_off = htons(ip_off | IP_MF);
 924         ip->ip_sum = 0;
 925         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 926                 ip->ip_sum = in_cksum(m0, hlen);
 927                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
 928         }
 929
 930 done:
 931         *m_frag = m0;
 932         return error;
 933 }
 934
 935 void
 936 in_delayed_cksum(struct mbuf *m)
 937 {
 938         struct ip *ip;
 939         uint16_t csum, offset, ip_len;
 940
 941         ip = mtod(m, struct ip *);
 942         offset = ip->ip_hl << 2 ;
 943         ip_len = ntohs(ip->ip_len);
 944         csum = in_cksum_skip(m, ip_len, offset);
 945         if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
 946                 csum = 0xffff;
 947         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 948
 949         /* find the mbuf in the chain where the checksum starts*/
 950         while ((m != NULL) && (offset >= m->m_len)) {
 951                 offset -= m->m_len;
 952                 m = m->m_next;
 953         }
 954         KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain."));
 955         KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs."));
 956         *(u_short *)(m->m_data + offset) = csum;
 957 }
 958
 959 /*
 960  * IP socket option processing.
 961  */
 962 int
 963 ip_ctloutput(struct socket *so, struct sockopt *sopt)
 964 {
 965         struct  inpcb *inp = sotoinpcb(so);
 966         int     error, optval;
 967 #ifdef  RSS
 968         uint32_t rss_bucket;
 969         int retval;
 970 #endif
 971
 972         error = optval = 0;
 973         if (sopt->sopt_level != IPPROTO_IP) {
 974                 error = EINVAL;
 975
 976                 if (sopt->sopt_level == SOL_SOCKET &&
 977                     sopt->sopt_dir == SOPT_SET) {
 978                         switch (sopt->sopt_name) {
 979                         case SO_REUSEADDR:
 980                                 INP_WLOCK(inp);
 981                                 if ((so->so_options & SO_REUSEADDR) != 0)
 982                                         inp->inp_flags2 |= INP_REUSEADDR;
 983                                 else
 984                                         inp->inp_flags2 &= ~INP_REUSEADDR;
 985                                 INP_WUNLOCK(inp);
 986                                 error = 0;
 987                                 break;
 988                         case SO_REUSEPORT:
 989                                 INP_WLOCK(inp);
 990                                 if ((so->so_options & SO_REUSEPORT) != 0)
 991                                         inp->inp_flags2 |= INP_REUSEPORT;
 992                                 else
 993                                         inp->inp_flags2 &= ~INP_REUSEPORT;
 994                                 INP_WUNLOCK(inp);
 995                                 error = 0;
 996                                 break;
 997                         case SO_SETFIB:
 998                                 INP_WLOCK(inp);
 999                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
1000                                 INP_WUNLOCK(inp);
1001                                 error = 0;
1002                                 break;
1003                         case SO_MAX_PACING_RATE:
1004 #ifdef RATELIMIT
1005                                 INP_WLOCK(inp);
1006                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1007                                 INP_WUNLOCK(inp);
1008                                 error = 0;
1009 #else
1010                                 error = EOPNOTSUPP;
1011 #endif
1012                                 break;
1013                         default:
1014                                 break;
1015                         }
1016                 }
1017                 return (error);
1018         }
1019
1020         switch (sopt->sopt_dir) {
1021         case SOPT_SET:
1022                 switch (sopt->sopt_name) {
1023                 case IP_OPTIONS:
1024 #ifdef notyet
1025                 case IP_RETOPTS:
1026 #endif
1027                 {
1028                         struct mbuf *m;
1029                         if (sopt->sopt_valsize > MLEN) {
1030                                 error = EMSGSIZE;
1031                                 break;
1032                         }
1033                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1034                         if (m == NULL) {
1035                                 error = ENOBUFS;
1036                                 break;
1037                         }
1038                         m->m_len = sopt->sopt_valsize;
1039                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1040                                             m->m_len);
1041                         if (error) {
1042                                 m_free(m);
1043                                 break;
1044                         }
1045                         INP_WLOCK(inp);
1046                         error = ip_pcbopts(inp, sopt->sopt_name, m);
1047                         INP_WUNLOCK(inp);
1048                         return (error);
1049                 }
1050
1051                 case IP_BINDANY:
1052                         if (sopt->sopt_td != NULL) {
1053                                 error = priv_check(sopt->sopt_td,
1054                                     PRIV_NETINET_BINDANY);
1055                                 if (error)
1056                                         break;
1057                         }
1058                         /* FALLTHROUGH */
1059                 case IP_BINDMULTI:
1060 #ifdef  RSS
1061                 case IP_RSS_LISTEN_BUCKET:
1062 #endif
1063                 case IP_TOS:
1064                 case IP_TTL:
1065                 case IP_MINTTL:
1066                 case IP_RECVOPTS:
1067                 case IP_RECVRETOPTS:
1068                 case IP_ORIGDSTADDR:
1069                 case IP_RECVDSTADDR:
1070                 case IP_RECVTTL:
1071                 case IP_RECVIF:
1072                 case IP_ONESBCAST:
1073                 case IP_DONTFRAG:
1074                 case IP_RECVTOS:
1075                 case IP_RECVFLOWID:
1076 #ifdef  RSS
1077                 case IP_RECVRSSBUCKETID:
1078 #endif
1079                         error = sooptcopyin(sopt, &optval, sizeof optval,
1080                                             sizeof optval);
1081                         if (error)
1082                                 break;
1083
1084                         switch (sopt->sopt_name) {
1085                         case IP_TOS:
1086                                 inp->inp_ip_tos = optval;
1087                                 break;
1088
1089                         case IP_TTL:
1090                                 inp->inp_ip_ttl = optval;
1091                                 break;
1092
1093                         case IP_MINTTL:
1094                                 if (optval >= 0 && optval <= MAXTTL)
1095                                         inp->inp_ip_minttl = optval;
1096                                 else
1097                                         error = EINVAL;
1098                                 break;
1099
1100 #define OPTSET(bit) do {                                                \
1101         INP_WLOCK(inp);                                                 \
1102         if (optval)                                                     \
1103                 inp->inp_flags |= bit;                                  \
1104         else                                                            \
1105                 inp->inp_flags &= ~bit;                                 \
1106         INP_WUNLOCK(inp);                                               \
1107 } while (0)
1108
1109 #define OPTSET2(bit, val) do {                                          \
1110         INP_WLOCK(inp);                                                 \
1111         if (val)                                                        \
1112                 inp->inp_flags2 |= bit;                                 \
1113         else                                                            \
1114                 inp->inp_flags2 &= ~bit;                                \
1115         INP_WUNLOCK(inp);                                               \
1116 } while (0)
1117
1118                         case IP_RECVOPTS:
1119                                 OPTSET(INP_RECVOPTS);
1120                                 break;
1121
1122                         case IP_RECVRETOPTS:
1123                                 OPTSET(INP_RECVRETOPTS);
1124                                 break;
1125
1126                         case IP_RECVDSTADDR:
1127                                 OPTSET(INP_RECVDSTADDR);
1128                                 break;
1129
1130                         case IP_ORIGDSTADDR:
1131                                 OPTSET2(INP_ORIGDSTADDR, optval);
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 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1234                 case IP_IPSEC_POLICY:
1235                         if (IPSEC_ENABLED(ipv4)) {
1236                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1237                                 break;
1238                         }
1239                         /* FALLTHROUGH */
1240 #endif /* IPSEC */
1241
1242                 default:
1243                         error = ENOPROTOOPT;
1244                         break;
1245                 }
1246                 break;
1247
1248         case SOPT_GET:
1249                 switch (sopt->sopt_name) {
1250                 case IP_OPTIONS:
1251                 case IP_RETOPTS:
1252                         if (inp->inp_options)
1253                                 error = sooptcopyout(sopt,
1254                                                      mtod(inp->inp_options,
1255                                                           char *),
1256                                                      inp->inp_options->m_len);
1257                         else
1258                                 sopt->sopt_valsize = 0;
1259                         break;
1260
1261                 case IP_TOS:
1262                 case IP_TTL:
1263                 case IP_MINTTL:
1264                 case IP_RECVOPTS:
1265                 case IP_RECVRETOPTS:
1266                 case IP_ORIGDSTADDR:
1267                 case IP_RECVDSTADDR:
1268                 case IP_RECVTTL:
1269                 case IP_RECVIF:
1270                 case IP_PORTRANGE:
1271                 case IP_ONESBCAST:
1272                 case IP_DONTFRAG:
1273                 case IP_BINDANY:
1274                 case IP_RECVTOS:
1275                 case IP_BINDMULTI:
1276                 case IP_FLOWID:
1277                 case IP_FLOWTYPE:
1278                 case IP_RECVFLOWID:
1279 #ifdef  RSS
1280                 case IP_RSSBUCKETID:
1281                 case IP_RECVRSSBUCKETID:
1282 #endif
1283                         switch (sopt->sopt_name) {
1284
1285                         case IP_TOS:
1286                                 optval = inp->inp_ip_tos;
1287                                 break;
1288
1289                         case IP_TTL:
1290                                 optval = inp->inp_ip_ttl;
1291                                 break;
1292
1293                         case IP_MINTTL:
1294                                 optval = inp->inp_ip_minttl;
1295                                 break;
1296
1297 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
1298 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
1299
1300                         case IP_RECVOPTS:
1301                                 optval = OPTBIT(INP_RECVOPTS);
1302                                 break;
1303
1304                         case IP_RECVRETOPTS:
1305                                 optval = OPTBIT(INP_RECVRETOPTS);
1306                                 break;
1307
1308                         case IP_RECVDSTADDR:
1309                                 optval = OPTBIT(INP_RECVDSTADDR);
1310                                 break;
1311
1312                         case IP_ORIGDSTADDR:
1313                                 optval = OPTBIT2(INP_ORIGDSTADDR);
1314                                 break;
1315
1316                         case IP_RECVTTL:
1317                                 optval = OPTBIT(INP_RECVTTL);
1318                                 break;
1319
1320                         case IP_RECVIF:
1321                                 optval = OPTBIT(INP_RECVIF);
1322                                 break;
1323
1324                         case IP_PORTRANGE:
1325                                 if (inp->inp_flags & INP_HIGHPORT)
1326                                         optval = IP_PORTRANGE_HIGH;
1327                                 else if (inp->inp_flags & INP_LOWPORT)
1328                                         optval = IP_PORTRANGE_LOW;
1329                                 else
1330                                         optval = 0;
1331                                 break;
1332
1333                         case IP_ONESBCAST:
1334                                 optval = OPTBIT(INP_ONESBCAST);
1335                                 break;
1336                         case IP_DONTFRAG:
1337                                 optval = OPTBIT(INP_DONTFRAG);
1338                                 break;
1339                         case IP_BINDANY:
1340                                 optval = OPTBIT(INP_BINDANY);
1341                                 break;
1342                         case IP_RECVTOS:
1343                                 optval = OPTBIT(INP_RECVTOS);
1344                                 break;
1345                         case IP_FLOWID:
1346                                 optval = inp->inp_flowid;
1347                                 break;
1348                         case IP_FLOWTYPE:
1349                                 optval = inp->inp_flowtype;
1350                                 break;
1351                         case IP_RECVFLOWID:
1352                                 optval = OPTBIT2(INP_RECVFLOWID);
1353                                 break;
1354 #ifdef  RSS
1355                         case IP_RSSBUCKETID:
1356                                 retval = rss_hash2bucket(inp->inp_flowid,
1357                                     inp->inp_flowtype,
1358                                     &rss_bucket);
1359                                 if (retval == 0)
1360                                         optval = rss_bucket;
1361                                 else
1362                                         error = EINVAL;
1363                                 break;
1364                         case IP_RECVRSSBUCKETID:
1365                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1366                                 break;
1367 #endif
1368                         case IP_BINDMULTI:
1369                                 optval = OPTBIT2(INP_BINDMULTI);
1370                                 break;
1371                         }
1372                         error = sooptcopyout(sopt, &optval, sizeof optval);
1373                         break;
1374
1375                 /*
1376                  * Multicast socket options are processed by the in_mcast
1377                  * module.
1378                  */
1379                 case IP_MULTICAST_IF:
1380                 case IP_MULTICAST_VIF:
1381                 case IP_MULTICAST_TTL:
1382                 case IP_MULTICAST_LOOP:
1383                 case IP_MSFILTER:
1384                         error = inp_getmoptions(inp, sopt);
1385                         break;
1386
1387 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1388                 case IP_IPSEC_POLICY:
1389                         if (IPSEC_ENABLED(ipv4)) {
1390                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1391                                 break;
1392                         }
1393                         /* FALLTHROUGH */
1394 #endif /* IPSEC */
1395
1396                 default:
1397                         error = ENOPROTOOPT;
1398                         break;
1399                 }
1400                 break;
1401         }
1402         return (error);
1403 }
1404
1405 /*
1406  * Routine called from ip_output() to loop back a copy of an IP multicast
1407  * packet to the input queue of a specified interface.  Note that this
1408  * calls the output routine of the loopback "driver", but with an interface
1409  * pointer that might NOT be a loopback interface -- evil, but easier than
1410  * replicating that code here.
1411  */
1412 static void
1413 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1414 {
1415         struct ip *ip;
1416         struct mbuf *copym;
1417
1418         /*
1419          * Make a deep copy of the packet because we're going to
1420          * modify the pack in order to generate checksums.
1421          */
1422         copym = m_dup(m, M_NOWAIT);
1423         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1424                 copym = m_pullup(copym, hlen);
1425         if (copym != NULL) {
1426                 /* If needed, compute the checksum and mark it as valid. */
1427                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1428                         in_delayed_cksum(copym);
1429                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1430                         copym->m_pkthdr.csum_flags |=
1431                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1432                         copym->m_pkthdr.csum_data = 0xffff;
1433                 }
1434                 /*
1435                  * We don't bother to fragment if the IP length is greater
1436                  * than the interface's MTU.  Can this possibly matter?
1437                  */
1438                 ip = mtod(copym, struct ip *);
1439                 ip->ip_sum = 0;
1440                 ip->ip_sum = in_cksum(copym, hlen);
1441                 if_simloop(ifp, copym, AF_INET, 0);
1442         }
1443 }