sys/netinet/ip_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1982, 1986, 1988, 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include "opt_inet.h"
  38 #include "opt_ratelimit.h"
  39 #include "opt_ipsec.h"
  40 #include "opt_mbuf_stress_test.h"
  41 #include "opt_mpath.h"
  42 #include "opt_route.h"
  43 #include "opt_sctp.h"
  44 #include "opt_rss.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/lock.h>
  50 #include <sys/malloc.h>
  51 #include <sys/mbuf.h>
  52 #include <sys/priv.h>
  53 #include <sys/proc.h>
  54 #include <sys/protosw.h>
  55 #include <sys/rmlock.h>
  56 #include <sys/sdt.h>
  57 #include <sys/socket.h>
  58 #include <sys/socketvar.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/ucred.h>
  61
  62 #include <net/if.h>
  63 #include <net/if_var.h>
  64 #include <net/if_llatbl.h>
  65 #include <net/netisr.h>
  66 #include <net/pfil.h>
  67 #include <net/route.h>
  68 #ifdef RADIX_MPATH
  69 #include <net/radix_mpath.h>
  70 #endif
  71 #include <net/rss_config.h>
  72 #include <net/vnet.h>
  73
  74 #include <netinet/in.h>
  75 #include <netinet/in_kdtrace.h>
  76 #include <netinet/in_systm.h>
  77 #include <netinet/ip.h>
  78 #include <netinet/in_pcb.h>
  79 #include <netinet/in_rss.h>
  80 #include <netinet/in_var.h>
  81 #include <netinet/ip_var.h>
  82 #include <netinet/ip_options.h>
  83
  84 #include <netinet/udp.h>
  85 #include <netinet/udp_var.h>
  86
  87 #ifdef SCTP
  88 #include <netinet/sctp.h>
  89 #include <netinet/sctp_crc32.h>
  90 #endif
  91
  92 #include <netipsec/ipsec_support.h>
  93
  94 #include <machine/in_cksum.h>
  95
  96 #include <security/mac/mac_framework.h>
  97
  98 #ifdef MBUF_STRESS_TEST
  99 static int mbuf_frag_size = 0;
 100 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
 101         &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
 102 #endif
 103
 104 static void     ip_mloopback(struct ifnet *, const struct mbuf *, int);
 105
 106
 107 extern int in_mcast_loop;
 108 extern  struct protosw inetsw[];
 109
 110 static inline int
 111 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp,
 112     struct sockaddr_in *dst, int *fibnum, int *error)
 113 {
 114         struct m_tag *fwd_tag = NULL;
 115         struct mbuf *m;
 116         struct in_addr odst;
 117         struct ip *ip;
 118
 119         m = *mp;
 120         ip = mtod(m, struct ip *);
 121
 122         /* Run through list of hooks for output packets. */
 123         odst.s_addr = ip->ip_dst.s_addr;
 124         switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, PFIL_OUT, inp)) {
 125         case PFIL_DROPPED:
 126                 *error = EPERM;
 127                 /* FALLTHROUGH */
 128         case PFIL_CONSUMED:
 129                 return 1; /* Finished */
 130         case PFIL_PASS:
 131                 *error = 0;
 132         }
 133         m = *mp;
 134         ip = mtod(m, struct ip *);
 135
 136         /* See if destination IP address was changed by packet filter. */
 137         if (odst.s_addr != ip->ip_dst.s_addr) {
 138                 m->m_flags |= M_SKIP_FIREWALL;
 139                 /* If destination is now ourself drop to ip_input(). */
 140                 if (in_localip(ip->ip_dst)) {
 141                         m->m_flags |= M_FASTFWD_OURS;
 142                         if (m->m_pkthdr.rcvif == NULL)
 143                                 m->m_pkthdr.rcvif = V_loif;
 144                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 145                                 m->m_pkthdr.csum_flags |=
 146                                         CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 147                                 m->m_pkthdr.csum_data = 0xffff;
 148                         }
 149                         m->m_pkthdr.csum_flags |=
 150                                 CSUM_IP_CHECKED | CSUM_IP_VALID;
 151 #ifdef SCTP
 152                         if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 153                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 154 #endif
 155                         *error = netisr_queue(NETISR_IP, m);
 156                         return 1; /* Finished */
 157                 }
 158
 159                 bzero(dst, sizeof(*dst));
 160                 dst->sin_family = AF_INET;
 161                 dst->sin_len = sizeof(*dst);
 162                 dst->sin_addr = ip->ip_dst;
 163
 164                 return -1; /* Reloop */
 165         }
 166         /* See if fib was changed by packet filter. */
 167         if ((*fibnum) != M_GETFIB(m)) {
 168                 m->m_flags |= M_SKIP_FIREWALL;
 169                 *fibnum = M_GETFIB(m);
 170                 return -1; /* Reloop for FIB change */
 171         }
 172
 173         /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
 174         if (m->m_flags & M_FASTFWD_OURS) {
 175                 if (m->m_pkthdr.rcvif == NULL)
 176                         m->m_pkthdr.rcvif = V_loif;
 177                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 178                         m->m_pkthdr.csum_flags |=
 179                                 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 180                         m->m_pkthdr.csum_data = 0xffff;
 181                 }
 182 #ifdef SCTP
 183                 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 184                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 185 #endif
 186                 m->m_pkthdr.csum_flags |=
 187                         CSUM_IP_CHECKED | CSUM_IP_VALID;
 188
 189                 *error = netisr_queue(NETISR_IP, m);
 190                 return 1; /* Finished */
 191         }
 192         /* Or forward to some other address? */
 193         if ((m->m_flags & M_IP_NEXTHOP) &&
 194             ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
 195                 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
 196                 m->m_flags |= M_SKIP_FIREWALL;
 197                 m->m_flags &= ~M_IP_NEXTHOP;
 198                 m_tag_delete(m, fwd_tag);
 199
 200                 return -1; /* Reloop for CHANGE of dst */
 201         }
 202
 203         return 0;
 204 }
 205
 206 /*
 207  * IP output.  The packet in mbuf chain m contains a skeletal IP
 208  * header (with len, off, ttl, proto, tos, src, dst).
 209  * The mbuf chain containing the packet will be freed.
 210  * The mbuf opt, if present, will not be freed.
 211  * If route ro is present and has ro_rt initialized, route lookup would be
 212  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 213  * then result of route lookup is stored in ro->ro_rt.
 214  *
 215  * In the IP forwarding case, the packet will arrive with options already
 216  * inserted, so must have a NULL opt pointer.
 217  */
 218 int
 219 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 220     struct ip_moptions *imo, struct inpcb *inp)
 221 {
 222         struct rm_priotracker in_ifa_tracker;
 223         struct epoch_tracker et;
 224         struct ip *ip;
 225         struct ifnet *ifp = NULL;       /* keep compiler happy */
 226         struct mbuf *m0;
 227         int hlen = sizeof (struct ip);
 228         int mtu;
 229         int error = 0;
 230         struct sockaddr_in *dst;
 231         const struct sockaddr_in *gw;
 232         struct in_ifaddr *ia;
 233         int isbroadcast;
 234         uint16_t ip_len, ip_off;
 235         struct route iproute;
 236         struct rtentry *rte;    /* cache for ro->ro_rt */
 237         uint32_t fibnum;
 238 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 239         int no_route_but_check_spd = 0;
 240 #endif
 241         M_ASSERTPKTHDR(m);
 242
 243         if (inp != NULL) {
 244                 INP_LOCK_ASSERT(inp);
 245                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 246                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 247                         m->m_pkthdr.flowid = inp->inp_flowid;
 248                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 249                 }
 250         }
 251
 252         if (ro == NULL) {
 253                 ro = &iproute;
 254                 bzero(ro, sizeof (*ro));
 255         }
 256
 257         if (opt) {
 258                 int len = 0;
 259                 m = ip_insertoptions(m, opt, &len);
 260                 if (len != 0)
 261                         hlen = len; /* ip->ip_hl is updated above */
 262         }
 263         ip = mtod(m, struct ip *);
 264         ip_len = ntohs(ip->ip_len);
 265         ip_off = ntohs(ip->ip_off);
 266
 267         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
 268                 ip->ip_v = IPVERSION;
 269                 ip->ip_hl = hlen >> 2;
 270                 ip_fillid(ip);
 271         } else {
 272                 /* Header already set, fetch hlen from there */
 273                 hlen = ip->ip_hl << 2;
 274         }
 275         if ((flags & IP_FORWARDING) == 0)
 276                 IPSTAT_INC(ips_localout);
 277
 278         /*
 279          * dst/gw handling:
 280          *
 281          * dst can be rewritten but always points to &ro->ro_dst.
 282          * gw is readonly but can point either to dst OR rt_gateway,
 283          * therefore we need restore gw if we're redoing lookup.
 284          */
 285         gw = dst = (struct sockaddr_in *)&ro->ro_dst;
 286         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 287         rte = ro->ro_rt;
 288         if (rte == NULL) {
 289                 bzero(dst, sizeof(*dst));
 290                 dst->sin_family = AF_INET;
 291                 dst->sin_len = sizeof(*dst);
 292                 dst->sin_addr = ip->ip_dst;
 293         }
 294         NET_EPOCH_ENTER(et);
 295 again:
 296         /*
 297          * Validate route against routing table additions;
 298          * a better/more specific route might have been added.
 299          */
 300         if (inp)
 301                 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
 302         /*
 303          * If there is a cached route,
 304          * check that it is to the same destination
 305          * and is still up.  If not, free it and try again.
 306          * The address family should also be checked in case of sharing the
 307          * cache with IPv6.
 308          * Also check whether routing cache needs invalidation.
 309          */
 310         rte = ro->ro_rt;
 311         if (rte && ((rte->rt_flags & RTF_UP) == 0 ||
 312                     rte->rt_ifp == NULL ||
 313                     !RT_LINK_IS_UP(rte->rt_ifp) ||
 314                           dst->sin_family != AF_INET ||
 315                           dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
 316                 RO_INVALIDATE_CACHE(ro);
 317                 rte = NULL;
 318         }
 319         ia = NULL;
 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                 ip->ip_dst.s_addr = INADDR_BROADCAST;
 336                 dst->sin_addr = ip->ip_dst;
 337                 ifp = ia->ia_ifp;
 338                 ip->ip_ttl = 1;
 339                 isbroadcast = 1;
 340         } else if (flags & IP_ROUTETOIF) {
 341                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 342                                                     M_GETFIB(m)))) == NULL &&
 343                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
 344                                                 M_GETFIB(m)))) == NULL) {
 345                         IPSTAT_INC(ips_noroute);
 346                         error = ENETUNREACH;
 347                         goto bad;
 348                 }
 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                 isbroadcast = 0;        /* fool gcc */
 362         } else {
 363                 /*
 364                  * We want to do any cloning requested by the link layer,
 365                  * as this is probably required in all cases for correct
 366                  * operation (as it is for ARP).
 367                  */
 368                 if (rte == NULL) {
 369 #ifdef RADIX_MPATH
 370                         rtalloc_mpath_fib(ro,
 371                             ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
 372                             fibnum);
 373 #else
 374                         in_rtalloc_ign(ro, 0, fibnum);
 375 #endif
 376                         rte = ro->ro_rt;
 377                 }
 378                 if (rte == NULL ||
 379                     (rte->rt_flags & RTF_UP) == 0 ||
 380                     rte->rt_ifp == NULL ||
 381                     !RT_LINK_IS_UP(rte->rt_ifp)) {
 382 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 383                         /*
 384                          * There is no route for this packet, but it is
 385                          * possible that a matching SPD entry exists.
 386                          */
 387                         no_route_but_check_spd = 1;
 388                         mtu = 0; /* Silence GCC warning. */
 389                         goto sendit;
 390 #endif
 391                         IPSTAT_INC(ips_noroute);
 392                         error = EHOSTUNREACH;
 393                         goto bad;
 394                 }
 395                 ia = ifatoia(rte->rt_ifa);
 396                 ifp = rte->rt_ifp;
 397                 counter_u64_add(rte->rt_pksent, 1);
 398                 rt_update_ro_flags(ro);
 399                 if (rte->rt_flags & RTF_GATEWAY)
 400                         gw = (struct sockaddr_in *)rte->rt_gateway;
 401                 if (rte->rt_flags & RTF_HOST)
 402                         isbroadcast = (rte->rt_flags & RTF_BROADCAST);
 403                 else if (ifp->if_flags & IFF_BROADCAST)
 404                         isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
 405                 else
 406                         isbroadcast = 0;
 407         }
 408
 409         /*
 410          * Calculate MTU.  If we have a route that is up, use that,
 411          * otherwise use the interface's MTU.
 412          */
 413         if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
 414                 mtu = rte->rt_mtu;
 415         else
 416                 mtu = ifp->if_mtu;
 417         /* Catch a possible divide by zero later. */
 418         KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
 419             __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
 420
 421         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 422                 m->m_flags |= M_MCAST;
 423                 /*
 424                  * IP destination address is multicast.  Make sure "gw"
 425                  * still points to the address in "ro".  (It may have been
 426                  * changed to point to a gateway address, above.)
 427                  */
 428                 gw = dst;
 429                 /*
 430                  * See if the caller provided any multicast options
 431                  */
 432                 if (imo != NULL) {
 433                         ip->ip_ttl = imo->imo_multicast_ttl;
 434                         if (imo->imo_multicast_vif != -1)
 435                                 ip->ip_src.s_addr =
 436                                     ip_mcast_src ?
 437                                     ip_mcast_src(imo->imo_multicast_vif) :
 438                                     INADDR_ANY;
 439                 } else
 440                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
 441                 /*
 442                  * Confirm that the outgoing interface supports multicast.
 443                  */
 444                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
 445                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
 446                                 IPSTAT_INC(ips_noroute);
 447                                 error = ENETUNREACH;
 448                                 goto bad;
 449                         }
 450                 }
 451                 /*
 452                  * If source address not specified yet, use address
 453                  * of outgoing interface.
 454                  */
 455                 if (ip->ip_src.s_addr == INADDR_ANY) {
 456                         /* Interface may have no addresses. */
 457                         if (ia != NULL)
 458                                 ip->ip_src = IA_SIN(ia)->sin_addr;
 459                 }
 460
 461                 if ((imo == NULL && in_mcast_loop) ||
 462                     (imo && imo->imo_multicast_loop)) {
 463                         /*
 464                          * Loop back multicast datagram if not expressly
 465                          * forbidden to do so, even if we are not a member
 466                          * of the group; ip_input() will filter it later,
 467                          * thus deferring a hash lookup and mutex acquisition
 468                          * at the expense of a cheap copy using m_copym().
 469                          */
 470                         ip_mloopback(ifp, m, hlen);
 471                 } else {
 472                         /*
 473                          * If we are acting as a multicast router, perform
 474                          * multicast forwarding as if the packet had just
 475                          * arrived on the interface to which we are about
 476                          * to send.  The multicast forwarding function
 477                          * recursively calls this function, using the
 478                          * IP_FORWARDING flag to prevent infinite recursion.
 479                          *
 480                          * Multicasts that are looped back by ip_mloopback(),
 481                          * above, will be forwarded by the ip_input() routine,
 482                          * if necessary.
 483                          */
 484                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
 485                                 /*
 486                                  * If rsvp daemon is not running, do not
 487                                  * set ip_moptions. This ensures that the packet
 488                                  * is multicast and not just sent down one link
 489                                  * as prescribed by rsvpd.
 490                                  */
 491                                 if (!V_rsvp_on)
 492                                         imo = NULL;
 493                                 if (ip_mforward &&
 494                                     ip_mforward(ip, ifp, m, imo) != 0) {
 495                                         m_freem(m);
 496                                         goto done;
 497                                 }
 498                         }
 499                 }
 500
 501                 /*
 502                  * Multicasts with a time-to-live of zero may be looped-
 503                  * back, above, but must not be transmitted on a network.
 504                  * Also, multicasts addressed to the loopback interface
 505                  * are not sent -- the above call to ip_mloopback() will
 506                  * loop back a copy. ip_input() will drop the copy if
 507                  * this host does not belong to the destination group on
 508                  * the loopback interface.
 509                  */
 510                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
 511                         m_freem(m);
 512                         goto done;
 513                 }
 514
 515                 goto sendit;
 516         }
 517
 518         /*
 519          * If the source address is not specified yet, use the address
 520          * of the outoing interface.
 521          */
 522         if (ip->ip_src.s_addr == INADDR_ANY) {
 523                 /* Interface may have no addresses. */
 524                 if (ia != NULL) {
 525                         ip->ip_src = IA_SIN(ia)->sin_addr;
 526                 }
 527         }
 528
 529         /*
 530          * Look for broadcast address and
 531          * verify user is allowed to send
 532          * such a packet.
 533          */
 534         if (isbroadcast) {
 535                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 536                         error = EADDRNOTAVAIL;
 537                         goto bad;
 538                 }
 539                 if ((flags & IP_ALLOWBROADCAST) == 0) {
 540                         error = EACCES;
 541                         goto bad;
 542                 }
 543                 /* don't allow broadcast messages to be fragmented */
 544                 if (ip_len > mtu) {
 545                         error = EMSGSIZE;
 546                         goto bad;
 547                 }
 548                 m->m_flags |= M_BCAST;
 549         } else {
 550                 m->m_flags &= ~M_BCAST;
 551         }
 552
 553 sendit:
 554 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 555         if (IPSEC_ENABLED(ipv4)) {
 556                 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
 557                         if (error == EINPROGRESS)
 558                                 error = 0;
 559                         goto done;
 560                 }
 561         }
 562         /*
 563          * Check if there was a route for this packet; return error if not.
 564          */
 565         if (no_route_but_check_spd) {
 566                 IPSTAT_INC(ips_noroute);
 567                 error = EHOSTUNREACH;
 568                 goto bad;
 569         }
 570         /* Update variables that are affected by ipsec4_output(). */
 571         ip = mtod(m, struct ip *);
 572         hlen = ip->ip_hl << 2;
 573 #endif /* IPSEC */
 574
 575         /* Jump over all PFIL processing if hooks are not active. */
 576         if (PFIL_HOOKED_OUT(V_inet_pfil_head)) {
 577                 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
 578                 case 1: /* Finished */
 579                         goto done;
 580
 581                 case 0: /* Continue normally */
 582                         ip = mtod(m, struct ip *);
 583                         break;
 584
 585                 case -1: /* Need to try again */
 586                         /* Reset everything for a new round */
 587                         RO_RTFREE(ro);
 588                         ro->ro_prepend = NULL;
 589                         rte = NULL;
 590                         gw = dst;
 591                         ip = mtod(m, struct ip *);
 592                         goto again;
 593
 594                 }
 595         }
 596
 597         /* 127/8 must not appear on wire - RFC1122. */
 598         if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
 599             (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
 600                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
 601                         IPSTAT_INC(ips_badaddr);
 602                         error = EADDRNOTAVAIL;
 603                         goto bad;
 604                 }
 605         }
 606
 607         m->m_pkthdr.csum_flags |= CSUM_IP;
 608         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
 609                 in_delayed_cksum(m);
 610                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 611         }
 612 #ifdef SCTP
 613         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
 614                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
 615                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 616         }
 617 #endif
 618
 619         /*
 620          * If small enough for interface, or the interface will take
 621          * care of the fragmentation for us, we can just send directly.
 622          */
 623         if (ip_len <= mtu ||
 624             (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
 625                 ip->ip_sum = 0;
 626                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
 627                         ip->ip_sum = in_cksum(m, hlen);
 628                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 629                 }
 630
 631                 /*
 632                  * Record statistics for this interface address.
 633                  * With CSUM_TSO the byte/packet count will be slightly
 634                  * incorrect because we count the IP+TCP headers only
 635                  * once instead of for every generated packet.
 636                  */
 637                 if (!(flags & IP_FORWARDING) && ia) {
 638                         if (m->m_pkthdr.csum_flags & CSUM_TSO)
 639                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
 640                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
 641                         else
 642                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 643
 644                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
 645                 }
 646 #ifdef MBUF_STRESS_TEST
 647                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
 648                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
 649 #endif
 650                 /*
 651                  * Reset layer specific mbuf flags
 652                  * to avoid confusing lower layers.
 653                  */
 654                 m_clrprotoflags(m);
 655                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
 656 #ifdef RATELIMIT
 657                 if (inp != NULL) {
 658                         if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 659                                 in_pcboutput_txrtlmt(inp, ifp, m);
 660                         /* stamp send tag on mbuf */
 661                         m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 662                 } else {
 663                         m->m_pkthdr.snd_tag = NULL;
 664                 }
 665 #endif
 666                 error = (*ifp->if_output)(ifp, m,
 667                     (const struct sockaddr *)gw, ro);
 668 #ifdef RATELIMIT
 669                 /* check for route change */
 670                 if (error == EAGAIN)
 671                         in_pcboutput_eagain(inp);
 672 #endif
 673                 goto done;
 674         }
 675
 676         /* Balk when DF bit is set or the interface didn't support TSO. */
 677         if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
 678                 error = EMSGSIZE;
 679                 IPSTAT_INC(ips_cantfrag);
 680                 goto bad;
 681         }
 682
 683         /*
 684          * Too large for interface; fragment if possible. If successful,
 685          * on return, m will point to a list of packets to be sent.
 686          */
 687         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
 688         if (error)
 689                 goto bad;
 690         for (; m; m = m0) {
 691                 m0 = m->m_nextpkt;
 692                 m->m_nextpkt = 0;
 693                 if (error == 0) {
 694                         /* Record statistics for this interface address. */
 695                         if (ia != NULL) {
 696                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 697                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 698                                     m->m_pkthdr.len);
 699                         }
 700                         /*
 701                          * Reset layer specific mbuf flags
 702                          * to avoid confusing upper layers.
 703                          */
 704                         m_clrprotoflags(m);
 705
 706                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
 707                             mtod(m, struct ip *), NULL);
 708 #ifdef RATELIMIT
 709                         if (inp != NULL) {
 710                                 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 711                                         in_pcboutput_txrtlmt(inp, ifp, m);
 712                                 /* stamp send tag on mbuf */
 713                                 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 714                         } else {
 715                                 m->m_pkthdr.snd_tag = NULL;
 716                         }
 717 #endif
 718                         error = (*ifp->if_output)(ifp, m,
 719                             (const struct sockaddr *)gw, ro);
 720 #ifdef RATELIMIT
 721                         /* check for route change */
 722                         if (error == EAGAIN)
 723                                 in_pcboutput_eagain(inp);
 724 #endif
 725                 } else
 726                         m_freem(m);
 727         }
 728
 729         if (error == 0)
 730                 IPSTAT_INC(ips_fragmented);
 731
 732 done:
 733         if (ro == &iproute)
 734                 RO_RTFREE(ro);
 735         else if (rte == NULL)
 736                 /*
 737                  * If the caller supplied a route but somehow the reference
 738                  * to it has been released need to prevent the caller
 739                  * calling RTFREE on it again.
 740                  */
 741                 ro->ro_rt = NULL;
 742         NET_EPOCH_EXIT(et);
 743         return (error);
 744  bad:
 745         m_freem(m);
 746         goto done;
 747 }
 748
 749 /*
 750  * Create a chain of fragments which fit the given mtu. m_frag points to the
 751  * mbuf to be fragmented; on return it points to the chain with the fragments.
 752  * Return 0 if no error. If error, m_frag may contain a partially built
 753  * chain of fragments that should be freed by the caller.
 754  *
 755  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
 756  */
 757 int
 758 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 759     u_long if_hwassist_flags)
 760 {
 761         int error = 0;
 762         int hlen = ip->ip_hl << 2;
 763         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
 764         int off;
 765         struct mbuf *m0 = *m_frag;      /* the original packet          */
 766         int firstlen;
 767         struct mbuf **mnext;
 768         int nfrags;
 769         uint16_t ip_len, ip_off;
 770
 771         ip_len = ntohs(ip->ip_len);
 772         ip_off = ntohs(ip->ip_off);
 773
 774         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
 775                 IPSTAT_INC(ips_cantfrag);
 776                 return EMSGSIZE;
 777         }
 778
 779         /*
 780          * Must be able to put at least 8 bytes per fragment.
 781          */
 782         if (len < 8)
 783                 return EMSGSIZE;
 784
 785         /*
 786          * If the interface will not calculate checksums on
 787          * fragmented packets, then do it here.
 788          */
 789         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 790                 in_delayed_cksum(m0);
 791                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 792         }
 793 #ifdef SCTP
 794         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
 795                 sctp_delayed_cksum(m0, hlen);
 796                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 797         }
 798 #endif
 799         if (len > PAGE_SIZE) {
 800                 /*
 801                  * Fragment large datagrams such that each segment
 802                  * contains a multiple of PAGE_SIZE amount of data,
 803                  * plus headers. This enables a receiver to perform
 804                  * page-flipping zero-copy optimizations.
 805                  *
 806                  * XXX When does this help given that sender and receiver
 807                  * could have different page sizes, and also mtu could
 808                  * be less than the receiver's page size ?
 809                  */
 810                 int newlen;
 811
 812                 off = MIN(mtu, m0->m_pkthdr.len);
 813
 814                 /*
 815                  * firstlen (off - hlen) must be aligned on an
 816                  * 8-byte boundary
 817                  */
 818                 if (off < hlen)
 819                         goto smart_frag_failure;
 820                 off = ((off - hlen) & ~7) + hlen;
 821                 newlen = (~PAGE_MASK) & mtu;
 822                 if ((newlen + sizeof (struct ip)) > mtu) {
 823                         /* we failed, go back the default */
 824 smart_frag_failure:
 825                         newlen = len;
 826                         off = hlen + len;
 827                 }
 828                 len = newlen;
 829
 830         } else {
 831                 off = hlen + len;
 832         }
 833
 834         firstlen = off - hlen;
 835         mnext = &m0->m_nextpkt;         /* pointer to next packet */
 836
 837         /*
 838          * Loop through length of segment after first fragment,
 839          * make new header and copy data of each part and link onto chain.
 840          * Here, m0 is the original packet, m is the fragment being created.
 841          * The fragments are linked off the m_nextpkt of the original
 842          * packet, which after processing serves as the first fragment.
 843          */
 844         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
 845                 struct ip *mhip;        /* ip header on the fragment */
 846                 struct mbuf *m;
 847                 int mhlen = sizeof (struct ip);
 848
 849                 m = m_gethdr(M_NOWAIT, MT_DATA);
 850                 if (m == NULL) {
 851                         error = ENOBUFS;
 852                         IPSTAT_INC(ips_odropped);
 853                         goto done;
 854                 }
 855                 /*
 856                  * Make sure the complete packet header gets copied
 857                  * from the originating mbuf to the newly created
 858                  * mbuf. This also ensures that existing firewall
 859                  * classification(s), VLAN tags and so on get copied
 860                  * to the resulting fragmented packet(s):
 861                  */
 862                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 863                         m_free(m);
 864                         error = ENOBUFS;
 865                         IPSTAT_INC(ips_odropped);
 866                         goto done;
 867                 }
 868                 /*
 869                  * In the first mbuf, leave room for the link header, then
 870                  * copy the original IP header including options. The payload
 871                  * goes into an additional mbuf chain returned by m_copym().
 872                  */
 873                 m->m_data += max_linkhdr;
 874                 mhip = mtod(m, struct ip *);
 875                 *mhip = *ip;
 876                 if (hlen > sizeof (struct ip)) {
 877                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
 878                         mhip->ip_v = IPVERSION;
 879                         mhip->ip_hl = mhlen >> 2;
 880                 }
 881                 m->m_len = mhlen;
 882                 /* XXX do we need to add ip_off below ? */
 883                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
 884                 if (off + len >= ip_len)
 885                         len = ip_len - off;
 886                 else
 887                         mhip->ip_off |= IP_MF;
 888                 mhip->ip_len = htons((u_short)(len + mhlen));
 889                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
 890                 if (m->m_next == NULL) {        /* copy failed */
 891                         m_free(m);
 892                         error = ENOBUFS;        /* ??? */
 893                         IPSTAT_INC(ips_odropped);
 894                         goto done;
 895                 }
 896                 m->m_pkthdr.len = mhlen + len;
 897 #ifdef MAC
 898                 mac_netinet_fragment(m0, m);
 899 #endif
 900                 mhip->ip_off = htons(mhip->ip_off);
 901                 mhip->ip_sum = 0;
 902                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 903                         mhip->ip_sum = in_cksum(m, mhlen);
 904                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 905                 }
 906                 *mnext = m;
 907                 mnext = &m->m_nextpkt;
 908         }
 909         IPSTAT_ADD(ips_ofragments, nfrags);
 910
 911         /*
 912          * Update first fragment by trimming what's been copied out
 913          * and updating header.
 914          */
 915         m_adj(m0, hlen + firstlen - ip_len);
 916         m0->m_pkthdr.len = hlen + firstlen;
 917         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
 918         ip->ip_off = htons(ip_off | IP_MF);
 919         ip->ip_sum = 0;
 920         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 921                 ip->ip_sum = in_cksum(m0, hlen);
 922                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
 923         }
 924
 925 done:
 926         *m_frag = m0;
 927         return error;
 928 }
 929
 930 void
 931 in_delayed_cksum(struct mbuf *m)
 932 {
 933         struct ip *ip;
 934         struct udphdr *uh;
 935         uint16_t cklen, csum, offset;
 936
 937         ip = mtod(m, struct ip *);
 938         offset = ip->ip_hl << 2 ;
 939
 940         if (m->m_pkthdr.csum_flags & CSUM_UDP) {
 941                 /* if udp header is not in the first mbuf copy udplen */
 942                 if (offset + sizeof(struct udphdr) > m->m_len) {
 943                         m_copydata(m, offset + offsetof(struct udphdr,
 944                             uh_ulen), sizeof(cklen), (caddr_t)&cklen);
 945                         cklen = ntohs(cklen);
 946                 } else {
 947                         uh = (struct udphdr *)mtodo(m, offset);
 948                         cklen = ntohs(uh->uh_ulen);
 949                 }
 950                 csum = in_cksum_skip(m, cklen + offset, offset);
 951                 if (csum == 0)
 952                         csum = 0xffff;
 953         } else {
 954                 cklen = ntohs(ip->ip_len);
 955                 csum = in_cksum_skip(m, cklen, offset);
 956         }
 957         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 958
 959         if (offset + sizeof(csum) > m->m_len)
 960                 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
 961         else
 962                 *(u_short *)mtodo(m, offset) = csum;
 963 }
 964
 965 /*
 966  * IP socket option processing.
 967  */
 968 int
 969 ip_ctloutput(struct socket *so, struct sockopt *sopt)
 970 {
 971         struct  inpcb *inp = sotoinpcb(so);
 972         int     error, optval;
 973 #ifdef  RSS
 974         uint32_t rss_bucket;
 975         int retval;
 976 #endif
 977
 978         error = optval = 0;
 979         if (sopt->sopt_level != IPPROTO_IP) {
 980                 error = EINVAL;
 981
 982                 if (sopt->sopt_level == SOL_SOCKET &&
 983                     sopt->sopt_dir == SOPT_SET) {
 984                         switch (sopt->sopt_name) {
 985                         case SO_REUSEADDR:
 986                                 INP_WLOCK(inp);
 987                                 if ((so->so_options & SO_REUSEADDR) != 0)
 988                                         inp->inp_flags2 |= INP_REUSEADDR;
 989                                 else
 990                                         inp->inp_flags2 &= ~INP_REUSEADDR;
 991                                 INP_WUNLOCK(inp);
 992                                 error = 0;
 993                                 break;
 994                         case SO_REUSEPORT:
 995                                 INP_WLOCK(inp);
 996                                 if ((so->so_options & SO_REUSEPORT) != 0)
 997                                         inp->inp_flags2 |= INP_REUSEPORT;
 998                                 else
 999                                         inp->inp_flags2 &= ~INP_REUSEPORT;
1000                                 INP_WUNLOCK(inp);
1001                                 error = 0;
1002                                 break;
1003                         case SO_REUSEPORT_LB:
1004                                 INP_WLOCK(inp);
1005                                 if ((so->so_options & SO_REUSEPORT_LB) != 0)
1006                                         inp->inp_flags2 |= INP_REUSEPORT_LB;
1007                                 else
1008                                         inp->inp_flags2 &= ~INP_REUSEPORT_LB;
1009                                 INP_WUNLOCK(inp);
1010                                 error = 0;
1011                                 break;
1012                         case SO_SETFIB:
1013                                 INP_WLOCK(inp);
1014                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
1015                                 INP_WUNLOCK(inp);
1016                                 error = 0;
1017                                 break;
1018                         case SO_MAX_PACING_RATE:
1019 #ifdef RATELIMIT
1020                                 INP_WLOCK(inp);
1021                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1022                                 INP_WUNLOCK(inp);
1023                                 error = 0;
1024 #else
1025                                 error = EOPNOTSUPP;
1026 #endif
1027                                 break;
1028                         default:
1029                                 break;
1030                         }
1031                 }
1032                 return (error);
1033         }
1034
1035         switch (sopt->sopt_dir) {
1036         case SOPT_SET:
1037                 switch (sopt->sopt_name) {
1038                 case IP_OPTIONS:
1039 #ifdef notyet
1040                 case IP_RETOPTS:
1041 #endif
1042                 {
1043                         struct mbuf *m;
1044                         if (sopt->sopt_valsize > MLEN) {
1045                                 error = EMSGSIZE;
1046                                 break;
1047                         }
1048                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1049                         if (m == NULL) {
1050                                 error = ENOBUFS;
1051                                 break;
1052                         }
1053                         m->m_len = sopt->sopt_valsize;
1054                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1055                                             m->m_len);
1056                         if (error) {
1057                                 m_free(m);
1058                                 break;
1059                         }
1060                         INP_WLOCK(inp);
1061                         error = ip_pcbopts(inp, sopt->sopt_name, m);
1062                         INP_WUNLOCK(inp);
1063                         return (error);
1064                 }
1065
1066                 case IP_BINDANY:
1067                         if (sopt->sopt_td != NULL) {
1068                                 error = priv_check(sopt->sopt_td,
1069                                     PRIV_NETINET_BINDANY);
1070                                 if (error)
1071                                         break;
1072                         }
1073                         /* FALLTHROUGH */
1074                 case IP_BINDMULTI:
1075 #ifdef  RSS
1076                 case IP_RSS_LISTEN_BUCKET:
1077 #endif
1078                 case IP_TOS:
1079                 case IP_TTL:
1080                 case IP_MINTTL:
1081                 case IP_RECVOPTS:
1082                 case IP_RECVRETOPTS:
1083                 case IP_ORIGDSTADDR:
1084                 case IP_RECVDSTADDR:
1085                 case IP_RECVTTL:
1086                 case IP_RECVIF:
1087                 case IP_ONESBCAST:
1088                 case IP_DONTFRAG:
1089                 case IP_RECVTOS:
1090                 case IP_RECVFLOWID:
1091 #ifdef  RSS
1092                 case IP_RECVRSSBUCKETID:
1093 #endif
1094                         error = sooptcopyin(sopt, &optval, sizeof optval,
1095                                             sizeof optval);
1096                         if (error)
1097                                 break;
1098
1099                         switch (sopt->sopt_name) {
1100                         case IP_TOS:
1101                                 inp->inp_ip_tos = optval;
1102                                 break;
1103
1104                         case IP_TTL:
1105                                 inp->inp_ip_ttl = optval;
1106                                 break;
1107
1108                         case IP_MINTTL:
1109                                 if (optval >= 0 && optval <= MAXTTL)
1110                                         inp->inp_ip_minttl = optval;
1111                                 else
1112                                         error = EINVAL;
1113                                 break;
1114
1115 #define OPTSET(bit) do {                                                \
1116         INP_WLOCK(inp);                                                 \
1117         if (optval)                                                     \
1118                 inp->inp_flags |= bit;                                  \
1119         else                                                            \
1120                 inp->inp_flags &= ~bit;                                 \
1121         INP_WUNLOCK(inp);                                               \
1122 } while (0)
1123
1124 #define OPTSET2(bit, val) do {                                          \
1125         INP_WLOCK(inp);                                                 \
1126         if (val)                                                        \
1127                 inp->inp_flags2 |= bit;                                 \
1128         else                                                            \
1129                 inp->inp_flags2 &= ~bit;                                \
1130         INP_WUNLOCK(inp);                                               \
1131 } while (0)
1132
1133                         case IP_RECVOPTS:
1134                                 OPTSET(INP_RECVOPTS);
1135                                 break;
1136
1137                         case IP_RECVRETOPTS:
1138                                 OPTSET(INP_RECVRETOPTS);
1139                                 break;
1140
1141                         case IP_RECVDSTADDR:
1142                                 OPTSET(INP_RECVDSTADDR);
1143                                 break;
1144
1145                         case IP_ORIGDSTADDR:
1146                                 OPTSET2(INP_ORIGDSTADDR, optval);
1147                                 break;
1148
1149                         case IP_RECVTTL:
1150                                 OPTSET(INP_RECVTTL);
1151                                 break;
1152
1153                         case IP_RECVIF:
1154                                 OPTSET(INP_RECVIF);
1155                                 break;
1156
1157                         case IP_ONESBCAST:
1158                                 OPTSET(INP_ONESBCAST);
1159                                 break;
1160                         case IP_DONTFRAG:
1161                                 OPTSET(INP_DONTFRAG);
1162                                 break;
1163                         case IP_BINDANY:
1164                                 OPTSET(INP_BINDANY);
1165                                 break;
1166                         case IP_RECVTOS:
1167                                 OPTSET(INP_RECVTOS);
1168                                 break;
1169                         case IP_BINDMULTI:
1170                                 OPTSET2(INP_BINDMULTI, optval);
1171                                 break;
1172                         case IP_RECVFLOWID:
1173                                 OPTSET2(INP_RECVFLOWID, optval);
1174                                 break;
1175 #ifdef  RSS
1176                         case IP_RSS_LISTEN_BUCKET:
1177                                 if ((optval >= 0) &&
1178                                     (optval < rss_getnumbuckets())) {
1179                                         inp->inp_rss_listen_bucket = optval;
1180                                         OPTSET2(INP_RSS_BUCKET_SET, 1);
1181                                 } else {
1182                                         error = EINVAL;
1183                                 }
1184                                 break;
1185                         case IP_RECVRSSBUCKETID:
1186                                 OPTSET2(INP_RECVRSSBUCKETID, optval);
1187                                 break;
1188 #endif
1189                         }
1190                         break;
1191 #undef OPTSET
1192 #undef OPTSET2
1193
1194                 /*
1195                  * Multicast socket options are processed by the in_mcast
1196                  * module.
1197                  */
1198                 case IP_MULTICAST_IF:
1199                 case IP_MULTICAST_VIF:
1200                 case IP_MULTICAST_TTL:
1201                 case IP_MULTICAST_LOOP:
1202                 case IP_ADD_MEMBERSHIP:
1203                 case IP_DROP_MEMBERSHIP:
1204                 case IP_ADD_SOURCE_MEMBERSHIP:
1205                 case IP_DROP_SOURCE_MEMBERSHIP:
1206                 case IP_BLOCK_SOURCE:
1207                 case IP_UNBLOCK_SOURCE:
1208                 case IP_MSFILTER:
1209                 case MCAST_JOIN_GROUP:
1210                 case MCAST_LEAVE_GROUP:
1211                 case MCAST_JOIN_SOURCE_GROUP:
1212                 case MCAST_LEAVE_SOURCE_GROUP:
1213                 case MCAST_BLOCK_SOURCE:
1214                 case MCAST_UNBLOCK_SOURCE:
1215                         error = inp_setmoptions(inp, sopt);
1216                         break;
1217
1218                 case IP_PORTRANGE:
1219                         error = sooptcopyin(sopt, &optval, sizeof optval,
1220                                             sizeof optval);
1221                         if (error)
1222                                 break;
1223
1224                         INP_WLOCK(inp);
1225                         switch (optval) {
1226                         case IP_PORTRANGE_DEFAULT:
1227                                 inp->inp_flags &= ~(INP_LOWPORT);
1228                                 inp->inp_flags &= ~(INP_HIGHPORT);
1229                                 break;
1230
1231                         case IP_PORTRANGE_HIGH:
1232                                 inp->inp_flags &= ~(INP_LOWPORT);
1233                                 inp->inp_flags |= INP_HIGHPORT;
1234                                 break;
1235
1236                         case IP_PORTRANGE_LOW:
1237                                 inp->inp_flags &= ~(INP_HIGHPORT);
1238                                 inp->inp_flags |= INP_LOWPORT;
1239                                 break;
1240
1241                         default:
1242                                 error = EINVAL;
1243                                 break;
1244                         }
1245                         INP_WUNLOCK(inp);
1246                         break;
1247
1248 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1249                 case IP_IPSEC_POLICY:
1250                         if (IPSEC_ENABLED(ipv4)) {
1251                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1252                                 break;
1253                         }
1254                         /* FALLTHROUGH */
1255 #endif /* IPSEC */
1256
1257                 default:
1258                         error = ENOPROTOOPT;
1259                         break;
1260                 }
1261                 break;
1262
1263         case SOPT_GET:
1264                 switch (sopt->sopt_name) {
1265                 case IP_OPTIONS:
1266                 case IP_RETOPTS:
1267                         INP_RLOCK(inp);
1268                         if (inp->inp_options) {
1269                                 struct mbuf *options;
1270
1271                                 options = m_copym(inp->inp_options, 0,
1272                                     M_COPYALL, M_NOWAIT);
1273                                 INP_RUNLOCK(inp);
1274                                 if (options != NULL) {
1275                                         error = sooptcopyout(sopt,
1276                                                              mtod(options, char *),
1277                                                              options->m_len);
1278                                         m_freem(options);
1279                                 } else
1280                                         error = ENOMEM;
1281                         } else {
1282                                 INP_RUNLOCK(inp);
1283                                 sopt->sopt_valsize = 0;
1284                         }
1285                         break;
1286
1287                 case IP_TOS:
1288                 case IP_TTL:
1289                 case IP_MINTTL:
1290                 case IP_RECVOPTS:
1291                 case IP_RECVRETOPTS:
1292                 case IP_ORIGDSTADDR:
1293                 case IP_RECVDSTADDR:
1294                 case IP_RECVTTL:
1295                 case IP_RECVIF:
1296                 case IP_PORTRANGE:
1297                 case IP_ONESBCAST:
1298                 case IP_DONTFRAG:
1299                 case IP_BINDANY:
1300                 case IP_RECVTOS:
1301                 case IP_BINDMULTI:
1302                 case IP_FLOWID:
1303                 case IP_FLOWTYPE:
1304                 case IP_RECVFLOWID:
1305 #ifdef  RSS
1306                 case IP_RSSBUCKETID:
1307                 case IP_RECVRSSBUCKETID:
1308 #endif
1309                         switch (sopt->sopt_name) {
1310
1311                         case IP_TOS:
1312                                 optval = inp->inp_ip_tos;
1313                                 break;
1314
1315                         case IP_TTL:
1316                                 optval = inp->inp_ip_ttl;
1317                                 break;
1318
1319                         case IP_MINTTL:
1320                                 optval = inp->inp_ip_minttl;
1321                                 break;
1322
1323 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
1324 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
1325
1326                         case IP_RECVOPTS:
1327                                 optval = OPTBIT(INP_RECVOPTS);
1328                                 break;
1329
1330                         case IP_RECVRETOPTS:
1331                                 optval = OPTBIT(INP_RECVRETOPTS);
1332                                 break;
1333
1334                         case IP_RECVDSTADDR:
1335                                 optval = OPTBIT(INP_RECVDSTADDR);
1336                                 break;
1337
1338                         case IP_ORIGDSTADDR:
1339                                 optval = OPTBIT2(INP_ORIGDSTADDR);
1340                                 break;
1341
1342                         case IP_RECVTTL:
1343                                 optval = OPTBIT(INP_RECVTTL);
1344                                 break;
1345
1346                         case IP_RECVIF:
1347                                 optval = OPTBIT(INP_RECVIF);
1348                                 break;
1349
1350                         case IP_PORTRANGE:
1351                                 if (inp->inp_flags & INP_HIGHPORT)
1352                                         optval = IP_PORTRANGE_HIGH;
1353                                 else if (inp->inp_flags & INP_LOWPORT)
1354                                         optval = IP_PORTRANGE_LOW;
1355                                 else
1356                                         optval = 0;
1357                                 break;
1358
1359                         case IP_ONESBCAST:
1360                                 optval = OPTBIT(INP_ONESBCAST);
1361                                 break;
1362                         case IP_DONTFRAG:
1363                                 optval = OPTBIT(INP_DONTFRAG);
1364                                 break;
1365                         case IP_BINDANY:
1366                                 optval = OPTBIT(INP_BINDANY);
1367                                 break;
1368                         case IP_RECVTOS:
1369                                 optval = OPTBIT(INP_RECVTOS);
1370                                 break;
1371                         case IP_FLOWID:
1372                                 optval = inp->inp_flowid;
1373                                 break;
1374                         case IP_FLOWTYPE:
1375                                 optval = inp->inp_flowtype;
1376                                 break;
1377                         case IP_RECVFLOWID:
1378                                 optval = OPTBIT2(INP_RECVFLOWID);
1379                                 break;
1380 #ifdef  RSS
1381                         case IP_RSSBUCKETID:
1382                                 retval = rss_hash2bucket(inp->inp_flowid,
1383                                     inp->inp_flowtype,
1384                                     &rss_bucket);
1385                                 if (retval == 0)
1386                                         optval = rss_bucket;
1387                                 else
1388                                         error = EINVAL;
1389                                 break;
1390                         case IP_RECVRSSBUCKETID:
1391                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1392                                 break;
1393 #endif
1394                         case IP_BINDMULTI:
1395                                 optval = OPTBIT2(INP_BINDMULTI);
1396                                 break;
1397                         }
1398                         error = sooptcopyout(sopt, &optval, sizeof optval);
1399                         break;
1400
1401                 /*
1402                  * Multicast socket options are processed by the in_mcast
1403                  * module.
1404                  */
1405                 case IP_MULTICAST_IF:
1406                 case IP_MULTICAST_VIF:
1407                 case IP_MULTICAST_TTL:
1408                 case IP_MULTICAST_LOOP:
1409                 case IP_MSFILTER:
1410                         error = inp_getmoptions(inp, sopt);
1411                         break;
1412
1413 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1414                 case IP_IPSEC_POLICY:
1415                         if (IPSEC_ENABLED(ipv4)) {
1416                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1417                                 break;
1418                         }
1419                         /* FALLTHROUGH */
1420 #endif /* IPSEC */
1421
1422                 default:
1423                         error = ENOPROTOOPT;
1424                         break;
1425                 }
1426                 break;
1427         }
1428         return (error);
1429 }
1430
1431 /*
1432  * Routine called from ip_output() to loop back a copy of an IP multicast
1433  * packet to the input queue of a specified interface.  Note that this
1434  * calls the output routine of the loopback "driver", but with an interface
1435  * pointer that might NOT be a loopback interface -- evil, but easier than
1436  * replicating that code here.
1437  */
1438 static void
1439 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1440 {
1441         struct ip *ip;
1442         struct mbuf *copym;
1443
1444         /*
1445          * Make a deep copy of the packet because we're going to
1446          * modify the pack in order to generate checksums.
1447          */
1448         copym = m_dup(m, M_NOWAIT);
1449         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1450                 copym = m_pullup(copym, hlen);
1451         if (copym != NULL) {
1452                 /* If needed, compute the checksum and mark it as valid. */
1453                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1454                         in_delayed_cksum(copym);
1455                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1456                         copym->m_pkthdr.csum_flags |=
1457                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1458                         copym->m_pkthdr.csum_data = 0xffff;
1459                 }
1460                 /*
1461                  * We don't bother to fragment if the IP length is greater
1462                  * than the interface's MTU.  Can this possibly matter?
1463                  */
1464                 ip = mtod(copym, struct ip *);
1465                 ip->ip_sum = 0;
1466                 ip->ip_sum = in_cksum(copym, hlen);
1467                 if_simloop(ifp, copym, AF_INET, 0);
1468         }
1469 }