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 #ifdef SCTP
  84 #include <netinet/sctp.h>
  85 #include <netinet/sctp_crc32.h>
  86 #endif
  87
  88 #include <netipsec/ipsec_support.h>
  89
  90 #include <machine/in_cksum.h>
  91
  92 #include <security/mac/mac_framework.h>
  93
  94 #ifdef MBUF_STRESS_TEST
  95 static int mbuf_frag_size = 0;
  96 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
  97         &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
  98 #endif
  99
 100 static void     ip_mloopback(struct ifnet *, const struct mbuf *, int);
 101
 102
 103 extern int in_mcast_loop;
 104 extern  struct protosw inetsw[];
 105
 106 static inline int
 107 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp,
 108     struct sockaddr_in *dst, int *fibnum, int *error)
 109 {
 110         struct m_tag *fwd_tag = NULL;
 111         struct mbuf *m;
 112         struct in_addr odst;
 113         struct ip *ip;
 114
 115         m = *mp;
 116         ip = mtod(m, struct ip *);
 117
 118         /* Run through list of hooks for output packets. */
 119         odst.s_addr = ip->ip_dst.s_addr;
 120         *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, 0, inp);
 121         m = *mp;
 122         if ((*error) != 0 || m == NULL)
 123                 return 1; /* Finished */
 124
 125         ip = mtod(m, struct ip *);
 126
 127         /* See if destination IP address was changed by packet filter. */
 128         if (odst.s_addr != ip->ip_dst.s_addr) {
 129                 m->m_flags |= M_SKIP_FIREWALL;
 130                 /* If destination is now ourself drop to ip_input(). */
 131                 if (in_localip(ip->ip_dst)) {
 132                         m->m_flags |= M_FASTFWD_OURS;
 133                         if (m->m_pkthdr.rcvif == NULL)
 134                                 m->m_pkthdr.rcvif = V_loif;
 135                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 136                                 m->m_pkthdr.csum_flags |=
 137                                         CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 138                                 m->m_pkthdr.csum_data = 0xffff;
 139                         }
 140                         m->m_pkthdr.csum_flags |=
 141                                 CSUM_IP_CHECKED | CSUM_IP_VALID;
 142 #ifdef SCTP
 143                         if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 144                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 145 #endif
 146                         *error = netisr_queue(NETISR_IP, m);
 147                         return 1; /* Finished */
 148                 }
 149
 150                 bzero(dst, sizeof(*dst));
 151                 dst->sin_family = AF_INET;
 152                 dst->sin_len = sizeof(*dst);
 153                 dst->sin_addr = ip->ip_dst;
 154
 155                 return -1; /* Reloop */
 156         }
 157         /* See if fib was changed by packet filter. */
 158         if ((*fibnum) != M_GETFIB(m)) {
 159                 m->m_flags |= M_SKIP_FIREWALL;
 160                 *fibnum = M_GETFIB(m);
 161                 return -1; /* Reloop for FIB change */
 162         }
 163
 164         /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
 165         if (m->m_flags & M_FASTFWD_OURS) {
 166                 if (m->m_pkthdr.rcvif == NULL)
 167                         m->m_pkthdr.rcvif = V_loif;
 168                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 169                         m->m_pkthdr.csum_flags |=
 170                                 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 171                         m->m_pkthdr.csum_data = 0xffff;
 172                 }
 173 #ifdef SCTP
 174                 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 175                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 176 #endif
 177                 m->m_pkthdr.csum_flags |=
 178                         CSUM_IP_CHECKED | CSUM_IP_VALID;
 179
 180                 *error = netisr_queue(NETISR_IP, m);
 181                 return 1; /* Finished */
 182         }
 183         /* Or forward to some other address? */
 184         if ((m->m_flags & M_IP_NEXTHOP) &&
 185             ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
 186                 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
 187                 m->m_flags |= M_SKIP_FIREWALL;
 188                 m->m_flags &= ~M_IP_NEXTHOP;
 189                 m_tag_delete(m, fwd_tag);
 190
 191                 return -1; /* Reloop for CHANGE of dst */
 192         }
 193
 194         return 0;
 195 }
 196
 197 /*
 198  * IP output.  The packet in mbuf chain m contains a skeletal IP
 199  * header (with len, off, ttl, proto, tos, src, dst).
 200  * The mbuf chain containing the packet will be freed.
 201  * The mbuf opt, if present, will not be freed.
 202  * If route ro is present and has ro_rt initialized, route lookup would be
 203  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 204  * then result of route lookup is stored in ro->ro_rt.
 205  *
 206  * In the IP forwarding case, the packet will arrive with options already
 207  * inserted, so must have a NULL opt pointer.
 208  */
 209 int
 210 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 211     struct ip_moptions *imo, struct inpcb *inp)
 212 {
 213         struct rm_priotracker in_ifa_tracker;
 214         struct ip *ip;
 215         struct ifnet *ifp = NULL;       /* keep compiler happy */
 216         struct mbuf *m0;
 217         int hlen = sizeof (struct ip);
 218         int mtu;
 219         int error = 0;
 220         struct sockaddr_in *dst;
 221         const struct sockaddr_in *gw;
 222         struct in_ifaddr *ia;
 223         int isbroadcast;
 224         uint16_t ip_len, ip_off;
 225         struct route iproute;
 226         struct rtentry *rte;    /* cache for ro->ro_rt */
 227         uint32_t fibnum;
 228 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 229         int no_route_but_check_spd = 0;
 230 #endif
 231         M_ASSERTPKTHDR(m);
 232
 233         if (inp != NULL) {
 234                 INP_LOCK_ASSERT(inp);
 235                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 236                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 237                         m->m_pkthdr.flowid = inp->inp_flowid;
 238                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 239                 }
 240         }
 241
 242         if (ro == NULL) {
 243                 ro = &iproute;
 244                 bzero(ro, sizeof (*ro));
 245         }
 246
 247         if (opt) {
 248                 int len = 0;
 249                 m = ip_insertoptions(m, opt, &len);
 250                 if (len != 0)
 251                         hlen = len; /* ip->ip_hl is updated above */
 252         }
 253         ip = mtod(m, struct ip *);
 254         ip_len = ntohs(ip->ip_len);
 255         ip_off = ntohs(ip->ip_off);
 256
 257         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
 258                 ip->ip_v = IPVERSION;
 259                 ip->ip_hl = hlen >> 2;
 260                 ip_fillid(ip);
 261                 IPSTAT_INC(ips_localout);
 262         } else {
 263                 /* Header already set, fetch hlen from there */
 264                 hlen = ip->ip_hl << 2;
 265         }
 266
 267         /*
 268          * dst/gw handling:
 269          *
 270          * dst can be rewritten but always points to &ro->ro_dst.
 271          * gw is readonly but can point either to dst OR rt_gateway,
 272          * therefore we need restore gw if we're redoing lookup.
 273          */
 274         gw = dst = (struct sockaddr_in *)&ro->ro_dst;
 275         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 276         rte = ro->ro_rt;
 277         if (rte == NULL) {
 278                 bzero(dst, sizeof(*dst));
 279                 dst->sin_family = AF_INET;
 280                 dst->sin_len = sizeof(*dst);
 281                 dst->sin_addr = ip->ip_dst;
 282         }
 283         NET_EPOCH_ENTER();
 284 again:
 285         /*
 286          * Validate route against routing table additions;
 287          * a better/more specific route might have been added.
 288          */
 289         if (inp)
 290                 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
 291         /*
 292          * If there is a cached route,
 293          * check that it is to the same destination
 294          * and is still up.  If not, free it and try again.
 295          * The address family should also be checked in case of sharing the
 296          * cache with IPv6.
 297          * Also check whether routing cache needs invalidation.
 298          */
 299         rte = ro->ro_rt;
 300         if (rte && ((rte->rt_flags & RTF_UP) == 0 ||
 301                     rte->rt_ifp == NULL ||
 302                     !RT_LINK_IS_UP(rte->rt_ifp) ||
 303                           dst->sin_family != AF_INET ||
 304                           dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
 305                 RO_INVALIDATE_CACHE(ro);
 306                 rte = NULL;
 307         }
 308         ia = NULL;
 309         /*
 310          * If routing to interface only, short circuit routing lookup.
 311          * The use of an all-ones broadcast address implies this; an
 312          * interface is specified by the broadcast address of an interface,
 313          * or the destination address of a ptp interface.
 314          */
 315         if (flags & IP_SENDONES) {
 316                 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
 317                                                       M_GETFIB(m)))) == NULL &&
 318                     (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 319                                                     M_GETFIB(m)))) == NULL) {
 320                         IPSTAT_INC(ips_noroute);
 321                         error = ENETUNREACH;
 322                         goto bad;
 323                 }
 324                 ip->ip_dst.s_addr = INADDR_BROADCAST;
 325                 dst->sin_addr = ip->ip_dst;
 326                 ifp = ia->ia_ifp;
 327                 ip->ip_ttl = 1;
 328                 isbroadcast = 1;
 329         } else if (flags & IP_ROUTETOIF) {
 330                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 331                                                     M_GETFIB(m)))) == NULL &&
 332                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
 333                                                 M_GETFIB(m)))) == NULL) {
 334                         IPSTAT_INC(ips_noroute);
 335                         error = ENETUNREACH;
 336                         goto bad;
 337                 }
 338                 ifp = ia->ia_ifp;
 339                 ip->ip_ttl = 1;
 340                 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
 341                     in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
 342         } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
 343             imo != NULL && imo->imo_multicast_ifp != NULL) {
 344                 /*
 345                  * Bypass the normal routing lookup for multicast
 346                  * packets if the interface is specified.
 347                  */
 348                 ifp = imo->imo_multicast_ifp;
 349                 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
 350                 isbroadcast = 0;        /* fool gcc */
 351         } else {
 352                 /*
 353                  * We want to do any cloning requested by the link layer,
 354                  * as this is probably required in all cases for correct
 355                  * operation (as it is for ARP).
 356                  */
 357                 if (rte == NULL) {
 358 #ifdef RADIX_MPATH
 359                         rtalloc_mpath_fib(ro,
 360                             ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
 361                             fibnum);
 362 #else
 363                         in_rtalloc_ign(ro, 0, fibnum);
 364 #endif
 365                         rte = ro->ro_rt;
 366                 }
 367                 if (rte == NULL ||
 368                     (rte->rt_flags & RTF_UP) == 0 ||
 369                     rte->rt_ifp == NULL ||
 370                     !RT_LINK_IS_UP(rte->rt_ifp)) {
 371 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 372                         /*
 373                          * There is no route for this packet, but it is
 374                          * possible that a matching SPD entry exists.
 375                          */
 376                         no_route_but_check_spd = 1;
 377                         mtu = 0; /* Silence GCC warning. */
 378                         goto sendit;
 379 #endif
 380                         IPSTAT_INC(ips_noroute);
 381                         error = EHOSTUNREACH;
 382                         goto bad;
 383                 }
 384                 ia = ifatoia(rte->rt_ifa);
 385                 ifp = rte->rt_ifp;
 386                 counter_u64_add(rte->rt_pksent, 1);
 387                 rt_update_ro_flags(ro);
 388                 if (rte->rt_flags & RTF_GATEWAY)
 389                         gw = (struct sockaddr_in *)rte->rt_gateway;
 390                 if (rte->rt_flags & RTF_HOST)
 391                         isbroadcast = (rte->rt_flags & RTF_BROADCAST);
 392                 else if (ifp->if_flags & IFF_BROADCAST)
 393                         isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
 394                 else
 395                         isbroadcast = 0;
 396         }
 397
 398         /*
 399          * Calculate MTU.  If we have a route that is up, use that,
 400          * otherwise use the interface's MTU.
 401          */
 402         if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
 403                 mtu = rte->rt_mtu;
 404         else
 405                 mtu = ifp->if_mtu;
 406         /* Catch a possible divide by zero later. */
 407         KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
 408             __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
 409
 410         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 411                 m->m_flags |= M_MCAST;
 412                 /*
 413                  * IP destination address is multicast.  Make sure "gw"
 414                  * still points to the address in "ro".  (It may have been
 415                  * changed to point to a gateway address, above.)
 416                  */
 417                 gw = dst;
 418                 /*
 419                  * See if the caller provided any multicast options
 420                  */
 421                 if (imo != NULL) {
 422                         ip->ip_ttl = imo->imo_multicast_ttl;
 423                         if (imo->imo_multicast_vif != -1)
 424                                 ip->ip_src.s_addr =
 425                                     ip_mcast_src ?
 426                                     ip_mcast_src(imo->imo_multicast_vif) :
 427                                     INADDR_ANY;
 428                 } else
 429                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
 430                 /*
 431                  * Confirm that the outgoing interface supports multicast.
 432                  */
 433                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
 434                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
 435                                 IPSTAT_INC(ips_noroute);
 436                                 error = ENETUNREACH;
 437                                 goto bad;
 438                         }
 439                 }
 440                 /*
 441                  * If source address not specified yet, use address
 442                  * of outgoing interface.
 443                  */
 444                 if (ip->ip_src.s_addr == INADDR_ANY) {
 445                         /* Interface may have no addresses. */
 446                         if (ia != NULL)
 447                                 ip->ip_src = IA_SIN(ia)->sin_addr;
 448                 }
 449
 450                 if ((imo == NULL && in_mcast_loop) ||
 451                     (imo && imo->imo_multicast_loop)) {
 452                         /*
 453                          * Loop back multicast datagram if not expressly
 454                          * forbidden to do so, even if we are not a member
 455                          * of the group; ip_input() will filter it later,
 456                          * thus deferring a hash lookup and mutex acquisition
 457                          * at the expense of a cheap copy using m_copym().
 458                          */
 459                         ip_mloopback(ifp, m, hlen);
 460                 } else {
 461                         /*
 462                          * If we are acting as a multicast router, perform
 463                          * multicast forwarding as if the packet had just
 464                          * arrived on the interface to which we are about
 465                          * to send.  The multicast forwarding function
 466                          * recursively calls this function, using the
 467                          * IP_FORWARDING flag to prevent infinite recursion.
 468                          *
 469                          * Multicasts that are looped back by ip_mloopback(),
 470                          * above, will be forwarded by the ip_input() routine,
 471                          * if necessary.
 472                          */
 473                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
 474                                 /*
 475                                  * If rsvp daemon is not running, do not
 476                                  * set ip_moptions. This ensures that the packet
 477                                  * is multicast and not just sent down one link
 478                                  * as prescribed by rsvpd.
 479                                  */
 480                                 if (!V_rsvp_on)
 481                                         imo = NULL;
 482                                 if (ip_mforward &&
 483                                     ip_mforward(ip, ifp, m, imo) != 0) {
 484                                         m_freem(m);
 485                                         goto done;
 486                                 }
 487                         }
 488                 }
 489
 490                 /*
 491                  * Multicasts with a time-to-live of zero may be looped-
 492                  * back, above, but must not be transmitted on a network.
 493                  * Also, multicasts addressed to the loopback interface
 494                  * are not sent -- the above call to ip_mloopback() will
 495                  * loop back a copy. ip_input() will drop the copy if
 496                  * this host does not belong to the destination group on
 497                  * the loopback interface.
 498                  */
 499                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
 500                         m_freem(m);
 501                         goto done;
 502                 }
 503
 504                 goto sendit;
 505         }
 506
 507         /*
 508          * If the source address is not specified yet, use the address
 509          * of the outoing interface.
 510          */
 511         if (ip->ip_src.s_addr == INADDR_ANY) {
 512                 /* Interface may have no addresses. */
 513                 if (ia != NULL) {
 514                         ip->ip_src = IA_SIN(ia)->sin_addr;
 515                 }
 516         }
 517
 518         /*
 519          * Look for broadcast address and
 520          * verify user is allowed to send
 521          * such a packet.
 522          */
 523         if (isbroadcast) {
 524                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 525                         error = EADDRNOTAVAIL;
 526                         goto bad;
 527                 }
 528                 if ((flags & IP_ALLOWBROADCAST) == 0) {
 529                         error = EACCES;
 530                         goto bad;
 531                 }
 532                 /* don't allow broadcast messages to be fragmented */
 533                 if (ip_len > mtu) {
 534                         error = EMSGSIZE;
 535                         goto bad;
 536                 }
 537                 m->m_flags |= M_BCAST;
 538         } else {
 539                 m->m_flags &= ~M_BCAST;
 540         }
 541
 542 sendit:
 543 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 544         if (IPSEC_ENABLED(ipv4)) {
 545                 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
 546                         if (error == EINPROGRESS)
 547                                 error = 0;
 548                         goto done;
 549                 }
 550         }
 551         /*
 552          * Check if there was a route for this packet; return error if not.
 553          */
 554         if (no_route_but_check_spd) {
 555                 IPSTAT_INC(ips_noroute);
 556                 error = EHOSTUNREACH;
 557                 goto bad;
 558         }
 559         /* Update variables that are affected by ipsec4_output(). */
 560         ip = mtod(m, struct ip *);
 561         hlen = ip->ip_hl << 2;
 562 #endif /* IPSEC */
 563
 564         /* Jump over all PFIL processing if hooks are not active. */
 565         if (PFIL_HOOKED(&V_inet_pfil_hook)) {
 566                 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
 567                 case 1: /* Finished */
 568                         goto done;
 569
 570                 case 0: /* Continue normally */
 571                         ip = mtod(m, struct ip *);
 572                         break;
 573
 574                 case -1: /* Need to try again */
 575                         /* Reset everything for a new round */
 576                         RO_RTFREE(ro);
 577                         ro->ro_prepend = NULL;
 578                         rte = NULL;
 579                         gw = dst;
 580                         ip = mtod(m, struct ip *);
 581                         goto again;
 582
 583                 }
 584         }
 585
 586         /* 127/8 must not appear on wire - RFC1122. */
 587         if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
 588             (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
 589                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
 590                         IPSTAT_INC(ips_badaddr);
 591                         error = EADDRNOTAVAIL;
 592                         goto bad;
 593                 }
 594         }
 595
 596         m->m_pkthdr.csum_flags |= CSUM_IP;
 597         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
 598                 in_delayed_cksum(m);
 599                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 600         }
 601 #ifdef SCTP
 602         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
 603                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
 604                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 605         }
 606 #endif
 607
 608         /*
 609          * If small enough for interface, or the interface will take
 610          * care of the fragmentation for us, we can just send directly.
 611          */
 612         if (ip_len <= mtu ||
 613             (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
 614                 ip->ip_sum = 0;
 615                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
 616                         ip->ip_sum = in_cksum(m, hlen);
 617                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 618                 }
 619
 620                 /*
 621                  * Record statistics for this interface address.
 622                  * With CSUM_TSO the byte/packet count will be slightly
 623                  * incorrect because we count the IP+TCP headers only
 624                  * once instead of for every generated packet.
 625                  */
 626                 if (!(flags & IP_FORWARDING) && ia) {
 627                         if (m->m_pkthdr.csum_flags & CSUM_TSO)
 628                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
 629                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
 630                         else
 631                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 632
 633                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
 634                 }
 635 #ifdef MBUF_STRESS_TEST
 636                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
 637                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
 638 #endif
 639                 /*
 640                  * Reset layer specific mbuf flags
 641                  * to avoid confusing lower layers.
 642                  */
 643                 m_clrprotoflags(m);
 644                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
 645 #ifdef RATELIMIT
 646                 if (inp != NULL) {
 647                         if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 648                                 in_pcboutput_txrtlmt(inp, ifp, m);
 649                         /* stamp send tag on mbuf */
 650                         m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 651                 } else {
 652                         m->m_pkthdr.snd_tag = NULL;
 653                 }
 654 #endif
 655                 error = (*ifp->if_output)(ifp, m,
 656                     (const struct sockaddr *)gw, ro);
 657 #ifdef RATELIMIT
 658                 /* check for route change */
 659                 if (error == EAGAIN)
 660                         in_pcboutput_eagain(inp);
 661 #endif
 662                 goto done;
 663         }
 664
 665         /* Balk when DF bit is set or the interface didn't support TSO. */
 666         if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
 667                 error = EMSGSIZE;
 668                 IPSTAT_INC(ips_cantfrag);
 669                 goto bad;
 670         }
 671
 672         /*
 673          * Too large for interface; fragment if possible. If successful,
 674          * on return, m will point to a list of packets to be sent.
 675          */
 676         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
 677         if (error)
 678                 goto bad;
 679         for (; m; m = m0) {
 680                 m0 = m->m_nextpkt;
 681                 m->m_nextpkt = 0;
 682                 if (error == 0) {
 683                         /* Record statistics for this interface address. */
 684                         if (ia != NULL) {
 685                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 686                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 687                                     m->m_pkthdr.len);
 688                         }
 689                         /*
 690                          * Reset layer specific mbuf flags
 691                          * to avoid confusing upper layers.
 692                          */
 693                         m_clrprotoflags(m);
 694
 695                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
 696                             mtod(m, struct ip *), NULL);
 697 #ifdef RATELIMIT
 698                         if (inp != NULL) {
 699                                 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 700                                         in_pcboutput_txrtlmt(inp, ifp, m);
 701                                 /* stamp send tag on mbuf */
 702                                 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 703                         } else {
 704                                 m->m_pkthdr.snd_tag = NULL;
 705                         }
 706 #endif
 707                         error = (*ifp->if_output)(ifp, m,
 708                             (const struct sockaddr *)gw, ro);
 709 #ifdef RATELIMIT
 710                         /* check for route change */
 711                         if (error == EAGAIN)
 712                                 in_pcboutput_eagain(inp);
 713 #endif
 714                 } else
 715                         m_freem(m);
 716         }
 717
 718         if (error == 0)
 719                 IPSTAT_INC(ips_fragmented);
 720
 721 done:
 722         if (ro == &iproute)
 723                 RO_RTFREE(ro);
 724         else if (rte == NULL)
 725                 /*
 726                  * If the caller supplied a route but somehow the reference
 727                  * to it has been released need to prevent the caller
 728                  * calling RTFREE on it again.
 729                  */
 730                 ro->ro_rt = NULL;
 731         NET_EPOCH_EXIT();
 732         return (error);
 733  bad:
 734         m_freem(m);
 735         goto done;
 736 }
 737
 738 /*
 739  * Create a chain of fragments which fit the given mtu. m_frag points to the
 740  * mbuf to be fragmented; on return it points to the chain with the fragments.
 741  * Return 0 if no error. If error, m_frag may contain a partially built
 742  * chain of fragments that should be freed by the caller.
 743  *
 744  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
 745  */
 746 int
 747 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 748     u_long if_hwassist_flags)
 749 {
 750         int error = 0;
 751         int hlen = ip->ip_hl << 2;
 752         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
 753         int off;
 754         struct mbuf *m0 = *m_frag;      /* the original packet          */
 755         int firstlen;
 756         struct mbuf **mnext;
 757         int nfrags;
 758         uint16_t ip_len, ip_off;
 759
 760         ip_len = ntohs(ip->ip_len);
 761         ip_off = ntohs(ip->ip_off);
 762
 763         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
 764                 IPSTAT_INC(ips_cantfrag);
 765                 return EMSGSIZE;
 766         }
 767
 768         /*
 769          * Must be able to put at least 8 bytes per fragment.
 770          */
 771         if (len < 8)
 772                 return EMSGSIZE;
 773
 774         /*
 775          * If the interface will not calculate checksums on
 776          * fragmented packets, then do it here.
 777          */
 778         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 779                 in_delayed_cksum(m0);
 780                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 781         }
 782 #ifdef SCTP
 783         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
 784                 sctp_delayed_cksum(m0, hlen);
 785                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 786         }
 787 #endif
 788         if (len > PAGE_SIZE) {
 789                 /*
 790                  * Fragment large datagrams such that each segment
 791                  * contains a multiple of PAGE_SIZE amount of data,
 792                  * plus headers. This enables a receiver to perform
 793                  * page-flipping zero-copy optimizations.
 794                  *
 795                  * XXX When does this help given that sender and receiver
 796                  * could have different page sizes, and also mtu could
 797                  * be less than the receiver's page size ?
 798                  */
 799                 int newlen;
 800
 801                 off = MIN(mtu, m0->m_pkthdr.len);
 802
 803                 /*
 804                  * firstlen (off - hlen) must be aligned on an
 805                  * 8-byte boundary
 806                  */
 807                 if (off < hlen)
 808                         goto smart_frag_failure;
 809                 off = ((off - hlen) & ~7) + hlen;
 810                 newlen = (~PAGE_MASK) & mtu;
 811                 if ((newlen + sizeof (struct ip)) > mtu) {
 812                         /* we failed, go back the default */
 813 smart_frag_failure:
 814                         newlen = len;
 815                         off = hlen + len;
 816                 }
 817                 len = newlen;
 818
 819         } else {
 820                 off = hlen + len;
 821         }
 822
 823         firstlen = off - hlen;
 824         mnext = &m0->m_nextpkt;         /* pointer to next packet */
 825
 826         /*
 827          * Loop through length of segment after first fragment,
 828          * make new header and copy data of each part and link onto chain.
 829          * Here, m0 is the original packet, m is the fragment being created.
 830          * The fragments are linked off the m_nextpkt of the original
 831          * packet, which after processing serves as the first fragment.
 832          */
 833         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
 834                 struct ip *mhip;        /* ip header on the fragment */
 835                 struct mbuf *m;
 836                 int mhlen = sizeof (struct ip);
 837
 838                 m = m_gethdr(M_NOWAIT, MT_DATA);
 839                 if (m == NULL) {
 840                         error = ENOBUFS;
 841                         IPSTAT_INC(ips_odropped);
 842                         goto done;
 843                 }
 844                 /*
 845                  * Make sure the complete packet header gets copied
 846                  * from the originating mbuf to the newly created
 847                  * mbuf. This also ensures that existing firewall
 848                  * classification(s), VLAN tags and so on get copied
 849                  * to the resulting fragmented packet(s):
 850                  */
 851                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 852                         m_free(m);
 853                         error = ENOBUFS;
 854                         IPSTAT_INC(ips_odropped);
 855                         goto done;
 856                 }
 857                 /*
 858                  * In the first mbuf, leave room for the link header, then
 859                  * copy the original IP header including options. The payload
 860                  * goes into an additional mbuf chain returned by m_copym().
 861                  */
 862                 m->m_data += max_linkhdr;
 863                 mhip = mtod(m, struct ip *);
 864                 *mhip = *ip;
 865                 if (hlen > sizeof (struct ip)) {
 866                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
 867                         mhip->ip_v = IPVERSION;
 868                         mhip->ip_hl = mhlen >> 2;
 869                 }
 870                 m->m_len = mhlen;
 871                 /* XXX do we need to add ip_off below ? */
 872                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
 873                 if (off + len >= ip_len)
 874                         len = ip_len - off;
 875                 else
 876                         mhip->ip_off |= IP_MF;
 877                 mhip->ip_len = htons((u_short)(len + mhlen));
 878                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
 879                 if (m->m_next == NULL) {        /* copy failed */
 880                         m_free(m);
 881                         error = ENOBUFS;        /* ??? */
 882                         IPSTAT_INC(ips_odropped);
 883                         goto done;
 884                 }
 885                 m->m_pkthdr.len = mhlen + len;
 886 #ifdef MAC
 887                 mac_netinet_fragment(m0, m);
 888 #endif
 889                 mhip->ip_off = htons(mhip->ip_off);
 890                 mhip->ip_sum = 0;
 891                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 892                         mhip->ip_sum = in_cksum(m, mhlen);
 893                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 894                 }
 895                 *mnext = m;
 896                 mnext = &m->m_nextpkt;
 897         }
 898         IPSTAT_ADD(ips_ofragments, nfrags);
 899
 900         /*
 901          * Update first fragment by trimming what's been copied out
 902          * and updating header.
 903          */
 904         m_adj(m0, hlen + firstlen - ip_len);
 905         m0->m_pkthdr.len = hlen + firstlen;
 906         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
 907         ip->ip_off = htons(ip_off | IP_MF);
 908         ip->ip_sum = 0;
 909         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 910                 ip->ip_sum = in_cksum(m0, hlen);
 911                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
 912         }
 913
 914 done:
 915         *m_frag = m0;
 916         return error;
 917 }
 918
 919 void
 920 in_delayed_cksum(struct mbuf *m)
 921 {
 922         struct ip *ip;
 923         uint16_t csum, offset, ip_len;
 924
 925         ip = mtod(m, struct ip *);
 926         offset = ip->ip_hl << 2 ;
 927         ip_len = ntohs(ip->ip_len);
 928         csum = in_cksum_skip(m, ip_len, offset);
 929         if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
 930                 csum = 0xffff;
 931         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 932
 933         /* find the mbuf in the chain where the checksum starts*/
 934         while ((m != NULL) && (offset >= m->m_len)) {
 935                 offset -= m->m_len;
 936                 m = m->m_next;
 937         }
 938         KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain."));
 939         KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs."));
 940         *(u_short *)(m->m_data + offset) = csum;
 941 }
 942
 943 /*
 944  * IP socket option processing.
 945  */
 946 int
 947 ip_ctloutput(struct socket *so, struct sockopt *sopt)
 948 {
 949         struct  inpcb *inp = sotoinpcb(so);
 950         int     error, optval;
 951 #ifdef  RSS
 952         uint32_t rss_bucket;
 953         int retval;
 954 #endif
 955
 956         error = optval = 0;
 957         if (sopt->sopt_level != IPPROTO_IP) {
 958                 error = EINVAL;
 959
 960                 if (sopt->sopt_level == SOL_SOCKET &&
 961                     sopt->sopt_dir == SOPT_SET) {
 962                         switch (sopt->sopt_name) {
 963                         case SO_REUSEADDR:
 964                                 INP_WLOCK(inp);
 965                                 if ((so->so_options & SO_REUSEADDR) != 0)
 966                                         inp->inp_flags2 |= INP_REUSEADDR;
 967                                 else
 968                                         inp->inp_flags2 &= ~INP_REUSEADDR;
 969                                 INP_WUNLOCK(inp);
 970                                 error = 0;
 971                                 break;
 972                         case SO_REUSEPORT:
 973                                 INP_WLOCK(inp);
 974                                 if ((so->so_options & SO_REUSEPORT) != 0)
 975                                         inp->inp_flags2 |= INP_REUSEPORT;
 976                                 else
 977                                         inp->inp_flags2 &= ~INP_REUSEPORT;
 978                                 INP_WUNLOCK(inp);
 979                                 error = 0;
 980                                 break;
 981                         case SO_SETFIB:
 982                                 INP_WLOCK(inp);
 983                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
 984                                 INP_WUNLOCK(inp);
 985                                 error = 0;
 986                                 break;
 987                         case SO_MAX_PACING_RATE:
 988 #ifdef RATELIMIT
 989                                 INP_WLOCK(inp);
 990                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
 991                                 INP_WUNLOCK(inp);
 992                                 error = 0;
 993 #else
 994                                 error = EOPNOTSUPP;
 995 #endif
 996                                 break;
 997                         default:
 998                                 break;
 999                         }
1000                 }
1001                 return (error);
1002         }
1003
1004         switch (sopt->sopt_dir) {
1005         case SOPT_SET:
1006                 switch (sopt->sopt_name) {
1007                 case IP_OPTIONS:
1008 #ifdef notyet
1009                 case IP_RETOPTS:
1010 #endif
1011                 {
1012                         struct mbuf *m;
1013                         if (sopt->sopt_valsize > MLEN) {
1014                                 error = EMSGSIZE;
1015                                 break;
1016                         }
1017                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1018                         if (m == NULL) {
1019                                 error = ENOBUFS;
1020                                 break;
1021                         }
1022                         m->m_len = sopt->sopt_valsize;
1023                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1024                                             m->m_len);
1025                         if (error) {
1026                                 m_free(m);
1027                                 break;
1028                         }
1029                         INP_WLOCK(inp);
1030                         error = ip_pcbopts(inp, sopt->sopt_name, m);
1031                         INP_WUNLOCK(inp);
1032                         return (error);
1033                 }
1034
1035                 case IP_BINDANY:
1036                         if (sopt->sopt_td != NULL) {
1037                                 error = priv_check(sopt->sopt_td,
1038                                     PRIV_NETINET_BINDANY);
1039                                 if (error)
1040                                         break;
1041                         }
1042                         /* FALLTHROUGH */
1043                 case IP_BINDMULTI:
1044 #ifdef  RSS
1045                 case IP_RSS_LISTEN_BUCKET:
1046 #endif
1047                 case IP_TOS:
1048                 case IP_TTL:
1049                 case IP_MINTTL:
1050                 case IP_RECVOPTS:
1051                 case IP_RECVRETOPTS:
1052                 case IP_ORIGDSTADDR:
1053                 case IP_RECVDSTADDR:
1054                 case IP_RECVTTL:
1055                 case IP_RECVIF:
1056                 case IP_ONESBCAST:
1057                 case IP_DONTFRAG:
1058                 case IP_RECVTOS:
1059                 case IP_RECVFLOWID:
1060 #ifdef  RSS
1061                 case IP_RECVRSSBUCKETID:
1062 #endif
1063                         error = sooptcopyin(sopt, &optval, sizeof optval,
1064                                             sizeof optval);
1065                         if (error)
1066                                 break;
1067
1068                         switch (sopt->sopt_name) {
1069                         case IP_TOS:
1070                                 inp->inp_ip_tos = optval;
1071                                 break;
1072
1073                         case IP_TTL:
1074                                 inp->inp_ip_ttl = optval;
1075                                 break;
1076
1077                         case IP_MINTTL:
1078                                 if (optval >= 0 && optval <= MAXTTL)
1079                                         inp->inp_ip_minttl = optval;
1080                                 else
1081                                         error = EINVAL;
1082                                 break;
1083
1084 #define OPTSET(bit) do {                                                \
1085         INP_WLOCK(inp);                                                 \
1086         if (optval)                                                     \
1087                 inp->inp_flags |= bit;                                  \
1088         else                                                            \
1089                 inp->inp_flags &= ~bit;                                 \
1090         INP_WUNLOCK(inp);                                               \
1091 } while (0)
1092
1093 #define OPTSET2(bit, val) do {                                          \
1094         INP_WLOCK(inp);                                                 \
1095         if (val)                                                        \
1096                 inp->inp_flags2 |= bit;                                 \
1097         else                                                            \
1098                 inp->inp_flags2 &= ~bit;                                \
1099         INP_WUNLOCK(inp);                                               \
1100 } while (0)
1101
1102                         case IP_RECVOPTS:
1103                                 OPTSET(INP_RECVOPTS);
1104                                 break;
1105
1106                         case IP_RECVRETOPTS:
1107                                 OPTSET(INP_RECVRETOPTS);
1108                                 break;
1109
1110                         case IP_RECVDSTADDR:
1111                                 OPTSET(INP_RECVDSTADDR);
1112                                 break;
1113
1114                         case IP_ORIGDSTADDR:
1115                                 OPTSET2(INP_ORIGDSTADDR, optval);
1116                                 break;
1117
1118                         case IP_RECVTTL:
1119                                 OPTSET(INP_RECVTTL);
1120                                 break;
1121
1122                         case IP_RECVIF:
1123                                 OPTSET(INP_RECVIF);
1124                                 break;
1125
1126                         case IP_ONESBCAST:
1127                                 OPTSET(INP_ONESBCAST);
1128                                 break;
1129                         case IP_DONTFRAG:
1130                                 OPTSET(INP_DONTFRAG);
1131                                 break;
1132                         case IP_BINDANY:
1133                                 OPTSET(INP_BINDANY);
1134                                 break;
1135                         case IP_RECVTOS:
1136                                 OPTSET(INP_RECVTOS);
1137                                 break;
1138                         case IP_BINDMULTI:
1139                                 OPTSET2(INP_BINDMULTI, optval);
1140                                 break;
1141                         case IP_RECVFLOWID:
1142                                 OPTSET2(INP_RECVFLOWID, optval);
1143                                 break;
1144 #ifdef  RSS
1145                         case IP_RSS_LISTEN_BUCKET:
1146                                 if ((optval >= 0) &&
1147                                     (optval < rss_getnumbuckets())) {
1148                                         inp->inp_rss_listen_bucket = optval;
1149                                         OPTSET2(INP_RSS_BUCKET_SET, 1);
1150                                 } else {
1151                                         error = EINVAL;
1152                                 }
1153                                 break;
1154                         case IP_RECVRSSBUCKETID:
1155                                 OPTSET2(INP_RECVRSSBUCKETID, optval);
1156                                 break;
1157 #endif
1158                         }
1159                         break;
1160 #undef OPTSET
1161 #undef OPTSET2
1162
1163                 /*
1164                  * Multicast socket options are processed by the in_mcast
1165                  * module.
1166                  */
1167                 case IP_MULTICAST_IF:
1168                 case IP_MULTICAST_VIF:
1169                 case IP_MULTICAST_TTL:
1170                 case IP_MULTICAST_LOOP:
1171                 case IP_ADD_MEMBERSHIP:
1172                 case IP_DROP_MEMBERSHIP:
1173                 case IP_ADD_SOURCE_MEMBERSHIP:
1174                 case IP_DROP_SOURCE_MEMBERSHIP:
1175                 case IP_BLOCK_SOURCE:
1176                 case IP_UNBLOCK_SOURCE:
1177                 case IP_MSFILTER:
1178                 case MCAST_JOIN_GROUP:
1179                 case MCAST_LEAVE_GROUP:
1180                 case MCAST_JOIN_SOURCE_GROUP:
1181                 case MCAST_LEAVE_SOURCE_GROUP:
1182                 case MCAST_BLOCK_SOURCE:
1183                 case MCAST_UNBLOCK_SOURCE:
1184                         error = inp_setmoptions(inp, sopt);
1185                         break;
1186
1187                 case IP_PORTRANGE:
1188                         error = sooptcopyin(sopt, &optval, sizeof optval,
1189                                             sizeof optval);
1190                         if (error)
1191                                 break;
1192
1193                         INP_WLOCK(inp);
1194                         switch (optval) {
1195                         case IP_PORTRANGE_DEFAULT:
1196                                 inp->inp_flags &= ~(INP_LOWPORT);
1197                                 inp->inp_flags &= ~(INP_HIGHPORT);
1198                                 break;
1199
1200                         case IP_PORTRANGE_HIGH:
1201                                 inp->inp_flags &= ~(INP_LOWPORT);
1202                                 inp->inp_flags |= INP_HIGHPORT;
1203                                 break;
1204
1205                         case IP_PORTRANGE_LOW:
1206                                 inp->inp_flags &= ~(INP_HIGHPORT);
1207                                 inp->inp_flags |= INP_LOWPORT;
1208                                 break;
1209
1210                         default:
1211                                 error = EINVAL;
1212                                 break;
1213                         }
1214                         INP_WUNLOCK(inp);
1215                         break;
1216
1217 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1218                 case IP_IPSEC_POLICY:
1219                         if (IPSEC_ENABLED(ipv4)) {
1220                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1221                                 break;
1222                         }
1223                         /* FALLTHROUGH */
1224 #endif /* IPSEC */
1225
1226                 default:
1227                         error = ENOPROTOOPT;
1228                         break;
1229                 }
1230                 break;
1231
1232         case SOPT_GET:
1233                 switch (sopt->sopt_name) {
1234                 case IP_OPTIONS:
1235                 case IP_RETOPTS:
1236                         if (inp->inp_options)
1237                                 error = sooptcopyout(sopt,
1238                                                      mtod(inp->inp_options,
1239                                                           char *),
1240                                                      inp->inp_options->m_len);
1241                         else
1242                                 sopt->sopt_valsize = 0;
1243                         break;
1244
1245                 case IP_TOS:
1246                 case IP_TTL:
1247                 case IP_MINTTL:
1248                 case IP_RECVOPTS:
1249                 case IP_RECVRETOPTS:
1250                 case IP_ORIGDSTADDR:
1251                 case IP_RECVDSTADDR:
1252                 case IP_RECVTTL:
1253                 case IP_RECVIF:
1254                 case IP_PORTRANGE:
1255                 case IP_ONESBCAST:
1256                 case IP_DONTFRAG:
1257                 case IP_BINDANY:
1258                 case IP_RECVTOS:
1259                 case IP_BINDMULTI:
1260                 case IP_FLOWID:
1261                 case IP_FLOWTYPE:
1262                 case IP_RECVFLOWID:
1263 #ifdef  RSS
1264                 case IP_RSSBUCKETID:
1265                 case IP_RECVRSSBUCKETID:
1266 #endif
1267                         switch (sopt->sopt_name) {
1268
1269                         case IP_TOS:
1270                                 optval = inp->inp_ip_tos;
1271                                 break;
1272
1273                         case IP_TTL:
1274                                 optval = inp->inp_ip_ttl;
1275                                 break;
1276
1277                         case IP_MINTTL:
1278                                 optval = inp->inp_ip_minttl;
1279                                 break;
1280
1281 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
1282 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
1283
1284                         case IP_RECVOPTS:
1285                                 optval = OPTBIT(INP_RECVOPTS);
1286                                 break;
1287
1288                         case IP_RECVRETOPTS:
1289                                 optval = OPTBIT(INP_RECVRETOPTS);
1290                                 break;
1291
1292                         case IP_RECVDSTADDR:
1293                                 optval = OPTBIT(INP_RECVDSTADDR);
1294                                 break;
1295
1296                         case IP_ORIGDSTADDR:
1297                                 optval = OPTBIT2(INP_ORIGDSTADDR);
1298                                 break;
1299
1300                         case IP_RECVTTL:
1301                                 optval = OPTBIT(INP_RECVTTL);
1302                                 break;
1303
1304                         case IP_RECVIF:
1305                                 optval = OPTBIT(INP_RECVIF);
1306                                 break;
1307
1308                         case IP_PORTRANGE:
1309                                 if (inp->inp_flags & INP_HIGHPORT)
1310                                         optval = IP_PORTRANGE_HIGH;
1311                                 else if (inp->inp_flags & INP_LOWPORT)
1312                                         optval = IP_PORTRANGE_LOW;
1313                                 else
1314                                         optval = 0;
1315                                 break;
1316
1317                         case IP_ONESBCAST:
1318                                 optval = OPTBIT(INP_ONESBCAST);
1319                                 break;
1320                         case IP_DONTFRAG:
1321                                 optval = OPTBIT(INP_DONTFRAG);
1322                                 break;
1323                         case IP_BINDANY:
1324                                 optval = OPTBIT(INP_BINDANY);
1325                                 break;
1326                         case IP_RECVTOS:
1327                                 optval = OPTBIT(INP_RECVTOS);
1328                                 break;
1329                         case IP_FLOWID:
1330                                 optval = inp->inp_flowid;
1331                                 break;
1332                         case IP_FLOWTYPE:
1333                                 optval = inp->inp_flowtype;
1334                                 break;
1335                         case IP_RECVFLOWID:
1336                                 optval = OPTBIT2(INP_RECVFLOWID);
1337                                 break;
1338 #ifdef  RSS
1339                         case IP_RSSBUCKETID:
1340                                 retval = rss_hash2bucket(inp->inp_flowid,
1341                                     inp->inp_flowtype,
1342                                     &rss_bucket);
1343                                 if (retval == 0)
1344                                         optval = rss_bucket;
1345                                 else
1346                                         error = EINVAL;
1347                                 break;
1348                         case IP_RECVRSSBUCKETID:
1349                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1350                                 break;
1351 #endif
1352                         case IP_BINDMULTI:
1353                                 optval = OPTBIT2(INP_BINDMULTI);
1354                                 break;
1355                         }
1356                         error = sooptcopyout(sopt, &optval, sizeof optval);
1357                         break;
1358
1359                 /*
1360                  * Multicast socket options are processed by the in_mcast
1361                  * module.
1362                  */
1363                 case IP_MULTICAST_IF:
1364                 case IP_MULTICAST_VIF:
1365                 case IP_MULTICAST_TTL:
1366                 case IP_MULTICAST_LOOP:
1367                 case IP_MSFILTER:
1368                         error = inp_getmoptions(inp, sopt);
1369                         break;
1370
1371 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1372                 case IP_IPSEC_POLICY:
1373                         if (IPSEC_ENABLED(ipv4)) {
1374                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1375                                 break;
1376                         }
1377                         /* FALLTHROUGH */
1378 #endif /* IPSEC */
1379
1380                 default:
1381                         error = ENOPROTOOPT;
1382                         break;
1383                 }
1384                 break;
1385         }
1386         return (error);
1387 }
1388
1389 /*
1390  * Routine called from ip_output() to loop back a copy of an IP multicast
1391  * packet to the input queue of a specified interface.  Note that this
1392  * calls the output routine of the loopback "driver", but with an interface
1393  * pointer that might NOT be a loopback interface -- evil, but easier than
1394  * replicating that code here.
1395  */
1396 static void
1397 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1398 {
1399         struct ip *ip;
1400         struct mbuf *copym;
1401
1402         /*
1403          * Make a deep copy of the packet because we're going to
1404          * modify the pack in order to generate checksums.
1405          */
1406         copym = m_dup(m, M_NOWAIT);
1407         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1408                 copym = m_pullup(copym, hlen);
1409         if (copym != NULL) {
1410                 /* If needed, compute the checksum and mark it as valid. */
1411                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1412                         in_delayed_cksum(copym);
1413                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1414                         copym->m_pkthdr.csum_flags |=
1415                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1416                         copym->m_pkthdr.csum_data = 0xffff;
1417                 }
1418                 /*
1419                  * We don't bother to fragment if the IP length is greater
1420                  * than the interface's MTU.  Can this possibly matter?
1421                  */
1422                 ip = mtod(copym, struct ip *);
1423                 ip->ip_sum = 0;
1424                 ip->ip_sum = in_cksum(copym, hlen);
1425                 if_simloop(ifp, copym, AF_INET, 0);
1426         }
1427 }