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