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         int have_ia_ref;
 229 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 230         int no_route_but_check_spd = 0;
 231 #endif
 232         M_ASSERTPKTHDR(m);
 233
 234         if (inp != NULL) {
 235                 INP_LOCK_ASSERT(inp);
 236                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 237                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 238                         m->m_pkthdr.flowid = inp->inp_flowid;
 239                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 240                 }
 241         }
 242
 243         if (ro == NULL) {
 244                 ro = &iproute;
 245                 bzero(ro, sizeof (*ro));
 246         }
 247
 248         if (opt) {
 249                 int len = 0;
 250                 m = ip_insertoptions(m, opt, &len);
 251                 if (len != 0)
 252                         hlen = len; /* ip->ip_hl is updated above */
 253         }
 254         ip = mtod(m, struct ip *);
 255         ip_len = ntohs(ip->ip_len);
 256         ip_off = ntohs(ip->ip_off);
 257
 258         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
 259                 ip->ip_v = IPVERSION;
 260                 ip->ip_hl = hlen >> 2;
 261                 ip_fillid(ip);
 262                 IPSTAT_INC(ips_localout);
 263         } else {
 264                 /* Header already set, fetch hlen from there */
 265                 hlen = ip->ip_hl << 2;
 266         }
 267
 268         /*
 269          * dst/gw handling:
 270          *
 271          * dst can be rewritten but always points to &ro->ro_dst.
 272          * gw is readonly but can point either to dst OR rt_gateway,
 273          * therefore we need restore gw if we're redoing lookup.
 274          */
 275         gw = dst = (struct sockaddr_in *)&ro->ro_dst;
 276         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 277         rte = ro->ro_rt;
 278         if (rte == NULL) {
 279                 bzero(dst, sizeof(*dst));
 280                 dst->sin_family = AF_INET;
 281                 dst->sin_len = sizeof(*dst);
 282                 dst->sin_addr = ip->ip_dst;
 283         }
 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         have_ia_ref = 0;
 310         /*
 311          * If routing to interface only, short circuit routing lookup.
 312          * The use of an all-ones broadcast address implies this; an
 313          * interface is specified by the broadcast address of an interface,
 314          * or the destination address of a ptp interface.
 315          */
 316         if (flags & IP_SENDONES) {
 317                 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
 318                                                       M_GETFIB(m)))) == NULL &&
 319                     (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 320                                                     M_GETFIB(m)))) == NULL) {
 321                         IPSTAT_INC(ips_noroute);
 322                         error = ENETUNREACH;
 323                         goto bad;
 324                 }
 325                 have_ia_ref = 1;
 326                 ip->ip_dst.s_addr = INADDR_BROADCAST;
 327                 dst->sin_addr = ip->ip_dst;
 328                 ifp = ia->ia_ifp;
 329                 ip->ip_ttl = 1;
 330                 isbroadcast = 1;
 331         } else if (flags & IP_ROUTETOIF) {
 332                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 333                                                     M_GETFIB(m)))) == NULL &&
 334                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
 335                                                 M_GETFIB(m)))) == NULL) {
 336                         IPSTAT_INC(ips_noroute);
 337                         error = ENETUNREACH;
 338                         goto bad;
 339                 }
 340                 have_ia_ref = 1;
 341                 ifp = ia->ia_ifp;
 342                 ip->ip_ttl = 1;
 343                 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
 344                     in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
 345         } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
 346             imo != NULL && imo->imo_multicast_ifp != NULL) {
 347                 /*
 348                  * Bypass the normal routing lookup for multicast
 349                  * packets if the interface is specified.
 350                  */
 351                 ifp = imo->imo_multicast_ifp;
 352                 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
 353                 if (ia)
 354                         have_ia_ref = 1;
 355                 isbroadcast = 0;        /* fool gcc */
 356         } else {
 357                 /*
 358                  * We want to do any cloning requested by the link layer,
 359                  * as this is probably required in all cases for correct
 360                  * operation (as it is for ARP).
 361                  */
 362                 if (rte == NULL) {
 363 #ifdef RADIX_MPATH
 364                         rtalloc_mpath_fib(ro,
 365                             ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
 366                             fibnum);
 367 #else
 368                         in_rtalloc_ign(ro, 0, fibnum);
 369 #endif
 370                         rte = ro->ro_rt;
 371                 }
 372                 if (rte == NULL ||
 373                     (rte->rt_flags & RTF_UP) == 0 ||
 374                     rte->rt_ifp == NULL ||
 375                     !RT_LINK_IS_UP(rte->rt_ifp)) {
 376 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 377                         /*
 378                          * There is no route for this packet, but it is
 379                          * possible that a matching SPD entry exists.
 380                          */
 381                         no_route_but_check_spd = 1;
 382                         mtu = 0; /* Silence GCC warning. */
 383                         goto sendit;
 384 #endif
 385                         IPSTAT_INC(ips_noroute);
 386                         error = EHOSTUNREACH;
 387                         goto bad;
 388                 }
 389                 ia = ifatoia(rte->rt_ifa);
 390                 ifp = rte->rt_ifp;
 391                 counter_u64_add(rte->rt_pksent, 1);
 392                 rt_update_ro_flags(ro);
 393                 if (rte->rt_flags & RTF_GATEWAY)
 394                         gw = (struct sockaddr_in *)rte->rt_gateway;
 395                 if (rte->rt_flags & RTF_HOST)
 396                         isbroadcast = (rte->rt_flags & RTF_BROADCAST);
 397                 else if (ifp->if_flags & IFF_BROADCAST)
 398                         isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
 399                 else
 400                         isbroadcast = 0;
 401         }
 402
 403         /*
 404          * Calculate MTU.  If we have a route that is up, use that,
 405          * otherwise use the interface's MTU.
 406          */
 407         if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
 408                 mtu = rte->rt_mtu;
 409         else
 410                 mtu = ifp->if_mtu;
 411         /* Catch a possible divide by zero later. */
 412         KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
 413             __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
 414
 415         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 416                 m->m_flags |= M_MCAST;
 417                 /*
 418                  * IP destination address is multicast.  Make sure "gw"
 419                  * still points to the address in "ro".  (It may have been
 420                  * changed to point to a gateway address, above.)
 421                  */
 422                 gw = dst;
 423                 /*
 424                  * See if the caller provided any multicast options
 425                  */
 426                 if (imo != NULL) {
 427                         ip->ip_ttl = imo->imo_multicast_ttl;
 428                         if (imo->imo_multicast_vif != -1)
 429                                 ip->ip_src.s_addr =
 430                                     ip_mcast_src ?
 431                                     ip_mcast_src(imo->imo_multicast_vif) :
 432                                     INADDR_ANY;
 433                 } else
 434                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
 435                 /*
 436                  * Confirm that the outgoing interface supports multicast.
 437                  */
 438                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
 439                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
 440                                 IPSTAT_INC(ips_noroute);
 441                                 error = ENETUNREACH;
 442                                 goto bad;
 443                         }
 444                 }
 445                 /*
 446                  * If source address not specified yet, use address
 447                  * of outgoing interface.
 448                  */
 449                 if (ip->ip_src.s_addr == INADDR_ANY) {
 450                         /* Interface may have no addresses. */
 451                         if (ia != NULL)
 452                                 ip->ip_src = IA_SIN(ia)->sin_addr;
 453                 }
 454
 455                 if ((imo == NULL && in_mcast_loop) ||
 456                     (imo && imo->imo_multicast_loop)) {
 457                         /*
 458                          * Loop back multicast datagram if not expressly
 459                          * forbidden to do so, even if we are not a member
 460                          * of the group; ip_input() will filter it later,
 461                          * thus deferring a hash lookup and mutex acquisition
 462                          * at the expense of a cheap copy using m_copym().
 463                          */
 464                         ip_mloopback(ifp, m, hlen);
 465                 } else {
 466                         /*
 467                          * If we are acting as a multicast router, perform
 468                          * multicast forwarding as if the packet had just
 469                          * arrived on the interface to which we are about
 470                          * to send.  The multicast forwarding function
 471                          * recursively calls this function, using the
 472                          * IP_FORWARDING flag to prevent infinite recursion.
 473                          *
 474                          * Multicasts that are looped back by ip_mloopback(),
 475                          * above, will be forwarded by the ip_input() routine,
 476                          * if necessary.
 477                          */
 478                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
 479                                 /*
 480                                  * If rsvp daemon is not running, do not
 481                                  * set ip_moptions. This ensures that the packet
 482                                  * is multicast and not just sent down one link
 483                                  * as prescribed by rsvpd.
 484                                  */
 485                                 if (!V_rsvp_on)
 486                                         imo = NULL;
 487                                 if (ip_mforward &&
 488                                     ip_mforward(ip, ifp, m, imo) != 0) {
 489                                         m_freem(m);
 490                                         goto done;
 491                                 }
 492                         }
 493                 }
 494
 495                 /*
 496                  * Multicasts with a time-to-live of zero may be looped-
 497                  * back, above, but must not be transmitted on a network.
 498                  * Also, multicasts addressed to the loopback interface
 499                  * are not sent -- the above call to ip_mloopback() will
 500                  * loop back a copy. ip_input() will drop the copy if
 501                  * this host does not belong to the destination group on
 502                  * the loopback interface.
 503                  */
 504                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
 505                         m_freem(m);
 506                         goto done;
 507                 }
 508
 509                 goto sendit;
 510         }
 511
 512         /*
 513          * If the source address is not specified yet, use the address
 514          * of the outoing interface.
 515          */
 516         if (ip->ip_src.s_addr == INADDR_ANY) {
 517                 /* Interface may have no addresses. */
 518                 if (ia != NULL) {
 519                         ip->ip_src = IA_SIN(ia)->sin_addr;
 520                 }
 521         }
 522
 523         /*
 524          * Look for broadcast address and
 525          * verify user is allowed to send
 526          * such a packet.
 527          */
 528         if (isbroadcast) {
 529                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 530                         error = EADDRNOTAVAIL;
 531                         goto bad;
 532                 }
 533                 if ((flags & IP_ALLOWBROADCAST) == 0) {
 534                         error = EACCES;
 535                         goto bad;
 536                 }
 537                 /* don't allow broadcast messages to be fragmented */
 538                 if (ip_len > mtu) {
 539                         error = EMSGSIZE;
 540                         goto bad;
 541                 }
 542                 m->m_flags |= M_BCAST;
 543         } else {
 544                 m->m_flags &= ~M_BCAST;
 545         }
 546
 547 sendit:
 548 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 549         if (IPSEC_ENABLED(ipv4)) {
 550                 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
 551                         if (error == EINPROGRESS)
 552                                 error = 0;
 553                         goto done;
 554                 }
 555         }
 556         /*
 557          * Check if there was a route for this packet; return error if not.
 558          */
 559         if (no_route_but_check_spd) {
 560                 IPSTAT_INC(ips_noroute);
 561                 error = EHOSTUNREACH;
 562                 goto bad;
 563         }
 564         /* Update variables that are affected by ipsec4_output(). */
 565         ip = mtod(m, struct ip *);
 566         hlen = ip->ip_hl << 2;
 567 #endif /* IPSEC */
 568
 569         /* Jump over all PFIL processing if hooks are not active. */
 570         if (PFIL_HOOKED(&V_inet_pfil_hook)) {
 571                 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
 572                 case 1: /* Finished */
 573                         goto done;
 574
 575                 case 0: /* Continue normally */
 576                         ip = mtod(m, struct ip *);
 577                         break;
 578
 579                 case -1: /* Need to try again */
 580                         /* Reset everything for a new round */
 581                         RO_RTFREE(ro);
 582                         if (have_ia_ref)
 583                                 ifa_free(&ia->ia_ifa);
 584                         ro->ro_prepend = NULL;
 585                         rte = NULL;
 586                         gw = dst;
 587                         ip = mtod(m, struct ip *);
 588                         goto again;
 589
 590                 }
 591         }
 592
 593         /* 127/8 must not appear on wire - RFC1122. */
 594         if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
 595             (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
 596                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
 597                         IPSTAT_INC(ips_badaddr);
 598                         error = EADDRNOTAVAIL;
 599                         goto bad;
 600                 }
 601         }
 602
 603         m->m_pkthdr.csum_flags |= CSUM_IP;
 604         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
 605                 in_delayed_cksum(m);
 606                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 607         }
 608 #ifdef SCTP
 609         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
 610                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
 611                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 612         }
 613 #endif
 614
 615         /*
 616          * If small enough for interface, or the interface will take
 617          * care of the fragmentation for us, we can just send directly.
 618          */
 619         if (ip_len <= mtu ||
 620             (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
 621                 ip->ip_sum = 0;
 622                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
 623                         ip->ip_sum = in_cksum(m, hlen);
 624                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 625                 }
 626
 627                 /*
 628                  * Record statistics for this interface address.
 629                  * With CSUM_TSO the byte/packet count will be slightly
 630                  * incorrect because we count the IP+TCP headers only
 631                  * once instead of for every generated packet.
 632                  */
 633                 if (!(flags & IP_FORWARDING) && ia) {
 634                         if (m->m_pkthdr.csum_flags & CSUM_TSO)
 635                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
 636                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
 637                         else
 638                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 639
 640                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
 641                 }
 642 #ifdef MBUF_STRESS_TEST
 643                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
 644                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
 645 #endif
 646                 /*
 647                  * Reset layer specific mbuf flags
 648                  * to avoid confusing lower layers.
 649                  */
 650                 m_clrprotoflags(m);
 651                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
 652 #ifdef RATELIMIT
 653                 if (inp != NULL) {
 654                         if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 655                                 in_pcboutput_txrtlmt(inp, ifp, m);
 656                         /* stamp send tag on mbuf */
 657                         m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 658                 } else {
 659                         m->m_pkthdr.snd_tag = NULL;
 660                 }
 661 #endif
 662                 error = (*ifp->if_output)(ifp, m,
 663                     (const struct sockaddr *)gw, ro);
 664 #ifdef RATELIMIT
 665                 /* check for route change */
 666                 if (error == EAGAIN)
 667                         in_pcboutput_eagain(inp);
 668 #endif
 669                 goto done;
 670         }
 671
 672         /* Balk when DF bit is set or the interface didn't support TSO. */
 673         if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
 674                 error = EMSGSIZE;
 675                 IPSTAT_INC(ips_cantfrag);
 676                 goto bad;
 677         }
 678
 679         /*
 680          * Too large for interface; fragment if possible. If successful,
 681          * on return, m will point to a list of packets to be sent.
 682          */
 683         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
 684         if (error)
 685                 goto bad;
 686         for (; m; m = m0) {
 687                 m0 = m->m_nextpkt;
 688                 m->m_nextpkt = 0;
 689                 if (error == 0) {
 690                         /* Record statistics for this interface address. */
 691                         if (ia != NULL) {
 692                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 693                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 694                                     m->m_pkthdr.len);
 695                         }
 696                         /*
 697                          * Reset layer specific mbuf flags
 698                          * to avoid confusing upper layers.
 699                          */
 700                         m_clrprotoflags(m);
 701
 702                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
 703                             mtod(m, struct ip *), NULL);
 704 #ifdef RATELIMIT
 705                         if (inp != NULL) {
 706                                 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 707                                         in_pcboutput_txrtlmt(inp, ifp, m);
 708                                 /* stamp send tag on mbuf */
 709                                 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 710                         } else {
 711                                 m->m_pkthdr.snd_tag = NULL;
 712                         }
 713 #endif
 714                         error = (*ifp->if_output)(ifp, m,
 715                             (const struct sockaddr *)gw, ro);
 716 #ifdef RATELIMIT
 717                         /* check for route change */
 718                         if (error == EAGAIN)
 719                                 in_pcboutput_eagain(inp);
 720 #endif
 721                 } else
 722                         m_freem(m);
 723         }
 724
 725         if (error == 0)
 726                 IPSTAT_INC(ips_fragmented);
 727
 728 done:
 729         if (ro == &iproute)
 730                 RO_RTFREE(ro);
 731         else if (rte == NULL)
 732                 /*
 733                  * If the caller supplied a route but somehow the reference
 734                  * to it has been released need to prevent the caller
 735                  * calling RTFREE on it again.
 736                  */
 737                 ro->ro_rt = NULL;
 738         if (have_ia_ref)
 739                 ifa_free(&ia->ia_ifa);
 740         return (error);
 741 bad:
 742         m_freem(m);
 743         goto done;
 744 }
 745
 746 /*
 747  * Create a chain of fragments which fit the given mtu. m_frag points to the
 748  * mbuf to be fragmented; on return it points to the chain with the fragments.
 749  * Return 0 if no error. If error, m_frag may contain a partially built
 750  * chain of fragments that should be freed by the caller.
 751  *
 752  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
 753  */
 754 int
 755 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 756     u_long if_hwassist_flags)
 757 {
 758         int error = 0;
 759         int hlen = ip->ip_hl << 2;
 760         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
 761         int off;
 762         struct mbuf *m0 = *m_frag;      /* the original packet          */
 763         int firstlen;
 764         struct mbuf **mnext;
 765         int nfrags;
 766         uint16_t ip_len, ip_off;
 767
 768         ip_len = ntohs(ip->ip_len);
 769         ip_off = ntohs(ip->ip_off);
 770
 771         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
 772                 IPSTAT_INC(ips_cantfrag);
 773                 return EMSGSIZE;
 774         }
 775
 776         /*
 777          * Must be able to put at least 8 bytes per fragment.
 778          */
 779         if (len < 8)
 780                 return EMSGSIZE;
 781
 782         /*
 783          * If the interface will not calculate checksums on
 784          * fragmented packets, then do it here.
 785          */
 786         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 787                 in_delayed_cksum(m0);
 788                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 789         }
 790 #ifdef SCTP
 791         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
 792                 sctp_delayed_cksum(m0, hlen);
 793                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 794         }
 795 #endif
 796         if (len > PAGE_SIZE) {
 797                 /*
 798                  * Fragment large datagrams such that each segment
 799                  * contains a multiple of PAGE_SIZE amount of data,
 800                  * plus headers. This enables a receiver to perform
 801                  * page-flipping zero-copy optimizations.
 802                  *
 803                  * XXX When does this help given that sender and receiver
 804                  * could have different page sizes, and also mtu could
 805                  * be less than the receiver's page size ?
 806                  */
 807                 int newlen;
 808
 809                 off = MIN(mtu, m0->m_pkthdr.len);
 810
 811                 /*
 812                  * firstlen (off - hlen) must be aligned on an
 813                  * 8-byte boundary
 814                  */
 815                 if (off < hlen)
 816                         goto smart_frag_failure;
 817                 off = ((off - hlen) & ~7) + hlen;
 818                 newlen = (~PAGE_MASK) & mtu;
 819                 if ((newlen + sizeof (struct ip)) > mtu) {
 820                         /* we failed, go back the default */
 821 smart_frag_failure:
 822                         newlen = len;
 823                         off = hlen + len;
 824                 }
 825                 len = newlen;
 826
 827         } else {
 828                 off = hlen + len;
 829         }
 830
 831         firstlen = off - hlen;
 832         mnext = &m0->m_nextpkt;         /* pointer to next packet */
 833
 834         /*
 835          * Loop through length of segment after first fragment,
 836          * make new header and copy data of each part and link onto chain.
 837          * Here, m0 is the original packet, m is the fragment being created.
 838          * The fragments are linked off the m_nextpkt of the original
 839          * packet, which after processing serves as the first fragment.
 840          */
 841         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
 842                 struct ip *mhip;        /* ip header on the fragment */
 843                 struct mbuf *m;
 844                 int mhlen = sizeof (struct ip);
 845
 846                 m = m_gethdr(M_NOWAIT, MT_DATA);
 847                 if (m == NULL) {
 848                         error = ENOBUFS;
 849                         IPSTAT_INC(ips_odropped);
 850                         goto done;
 851                 }
 852                 /*
 853                  * Make sure the complete packet header gets copied
 854                  * from the originating mbuf to the newly created
 855                  * mbuf. This also ensures that existing firewall
 856                  * classification(s), VLAN tags and so on get copied
 857                  * to the resulting fragmented packet(s):
 858                  */
 859                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 860                         m_free(m);
 861                         error = ENOBUFS;
 862                         IPSTAT_INC(ips_odropped);
 863                         goto done;
 864                 }
 865                 /*
 866                  * In the first mbuf, leave room for the link header, then
 867                  * copy the original IP header including options. The payload
 868                  * goes into an additional mbuf chain returned by m_copym().
 869                  */
 870                 m->m_data += max_linkhdr;
 871                 mhip = mtod(m, struct ip *);
 872                 *mhip = *ip;
 873                 if (hlen > sizeof (struct ip)) {
 874                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
 875                         mhip->ip_v = IPVERSION;
 876                         mhip->ip_hl = mhlen >> 2;
 877                 }
 878                 m->m_len = mhlen;
 879                 /* XXX do we need to add ip_off below ? */
 880                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
 881                 if (off + len >= ip_len)
 882                         len = ip_len - off;
 883                 else
 884                         mhip->ip_off |= IP_MF;
 885                 mhip->ip_len = htons((u_short)(len + mhlen));
 886                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
 887                 if (m->m_next == NULL) {        /* copy failed */
 888                         m_free(m);
 889                         error = ENOBUFS;        /* ??? */
 890                         IPSTAT_INC(ips_odropped);
 891                         goto done;
 892                 }
 893                 m->m_pkthdr.len = mhlen + len;
 894 #ifdef MAC
 895                 mac_netinet_fragment(m0, m);
 896 #endif
 897                 mhip->ip_off = htons(mhip->ip_off);
 898                 mhip->ip_sum = 0;
 899                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 900                         mhip->ip_sum = in_cksum(m, mhlen);
 901                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 902                 }
 903                 *mnext = m;
 904                 mnext = &m->m_nextpkt;
 905         }
 906         IPSTAT_ADD(ips_ofragments, nfrags);
 907
 908         /*
 909          * Update first fragment by trimming what's been copied out
 910          * and updating header.
 911          */
 912         m_adj(m0, hlen + firstlen - ip_len);
 913         m0->m_pkthdr.len = hlen + firstlen;
 914         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
 915         ip->ip_off = htons(ip_off | IP_MF);
 916         ip->ip_sum = 0;
 917         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 918                 ip->ip_sum = in_cksum(m0, hlen);
 919                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
 920         }
 921
 922 done:
 923         *m_frag = m0;
 924         return error;
 925 }
 926
 927 void
 928 in_delayed_cksum(struct mbuf *m)
 929 {
 930         struct ip *ip;
 931         uint16_t csum, offset, ip_len;
 932
 933         ip = mtod(m, struct ip *);
 934         offset = ip->ip_hl << 2 ;
 935         ip_len = ntohs(ip->ip_len);
 936         csum = in_cksum_skip(m, ip_len, offset);
 937         if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
 938                 csum = 0xffff;
 939         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 940
 941         /* find the mbuf in the chain where the checksum starts*/
 942         while ((m != NULL) && (offset >= m->m_len)) {
 943                 offset -= m->m_len;
 944                 m = m->m_next;
 945         }
 946         KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain."));
 947         KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs."));
 948         *(u_short *)(m->m_data + offset) = csum;
 949 }
 950
 951 /*
 952  * IP socket option processing.
 953  */
 954 int
 955 ip_ctloutput(struct socket *so, struct sockopt *sopt)
 956 {
 957         struct  inpcb *inp = sotoinpcb(so);
 958         int     error, optval;
 959 #ifdef  RSS
 960         uint32_t rss_bucket;
 961         int retval;
 962 #endif
 963
 964         error = optval = 0;
 965         if (sopt->sopt_level != IPPROTO_IP) {
 966                 error = EINVAL;
 967
 968                 if (sopt->sopt_level == SOL_SOCKET &&
 969                     sopt->sopt_dir == SOPT_SET) {
 970                         switch (sopt->sopt_name) {
 971                         case SO_REUSEADDR:
 972                                 INP_WLOCK(inp);
 973                                 if ((so->so_options & SO_REUSEADDR) != 0)
 974                                         inp->inp_flags2 |= INP_REUSEADDR;
 975                                 else
 976                                         inp->inp_flags2 &= ~INP_REUSEADDR;
 977                                 INP_WUNLOCK(inp);
 978                                 error = 0;
 979                                 break;
 980                         case SO_REUSEPORT:
 981                                 INP_WLOCK(inp);
 982                                 if ((so->so_options & SO_REUSEPORT) != 0)
 983                                         inp->inp_flags2 |= INP_REUSEPORT;
 984                                 else
 985                                         inp->inp_flags2 &= ~INP_REUSEPORT;
 986                                 INP_WUNLOCK(inp);
 987                                 error = 0;
 988                                 break;
 989                         case SO_SETFIB:
 990                                 INP_WLOCK(inp);
 991                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
 992                                 INP_WUNLOCK(inp);
 993                                 error = 0;
 994                                 break;
 995                         case SO_MAX_PACING_RATE:
 996 #ifdef RATELIMIT
 997                                 INP_WLOCK(inp);
 998                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
 999                                 INP_WUNLOCK(inp);
1000                                 error = 0;
1001 #else
1002                                 error = EOPNOTSUPP;
1003 #endif
1004                                 break;
1005                         default:
1006                                 break;
1007                         }
1008                 }
1009                 return (error);
1010         }
1011
1012         switch (sopt->sopt_dir) {
1013         case SOPT_SET:
1014                 switch (sopt->sopt_name) {
1015                 case IP_OPTIONS:
1016 #ifdef notyet
1017                 case IP_RETOPTS:
1018 #endif
1019                 {
1020                         struct mbuf *m;
1021                         if (sopt->sopt_valsize > MLEN) {
1022                                 error = EMSGSIZE;
1023                                 break;
1024                         }
1025                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1026                         if (m == NULL) {
1027                                 error = ENOBUFS;
1028                                 break;
1029                         }
1030                         m->m_len = sopt->sopt_valsize;
1031                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1032                                             m->m_len);
1033                         if (error) {
1034                                 m_free(m);
1035                                 break;
1036                         }
1037                         INP_WLOCK(inp);
1038                         error = ip_pcbopts(inp, sopt->sopt_name, m);
1039                         INP_WUNLOCK(inp);
1040                         return (error);
1041                 }
1042
1043                 case IP_BINDANY:
1044                         if (sopt->sopt_td != NULL) {
1045                                 error = priv_check(sopt->sopt_td,
1046                                     PRIV_NETINET_BINDANY);
1047                                 if (error)
1048                                         break;
1049                         }
1050                         /* FALLTHROUGH */
1051                 case IP_BINDMULTI:
1052 #ifdef  RSS
1053                 case IP_RSS_LISTEN_BUCKET:
1054 #endif
1055                 case IP_TOS:
1056                 case IP_TTL:
1057                 case IP_MINTTL:
1058                 case IP_RECVOPTS:
1059                 case IP_RECVRETOPTS:
1060                 case IP_ORIGDSTADDR:
1061                 case IP_RECVDSTADDR:
1062                 case IP_RECVTTL:
1063                 case IP_RECVIF:
1064                 case IP_ONESBCAST:
1065                 case IP_DONTFRAG:
1066                 case IP_RECVTOS:
1067                 case IP_RECVFLOWID:
1068 #ifdef  RSS
1069                 case IP_RECVRSSBUCKETID:
1070 #endif
1071                         error = sooptcopyin(sopt, &optval, sizeof optval,
1072                                             sizeof optval);
1073                         if (error)
1074                                 break;
1075
1076                         switch (sopt->sopt_name) {
1077                         case IP_TOS:
1078                                 inp->inp_ip_tos = optval;
1079                                 break;
1080
1081                         case IP_TTL:
1082                                 inp->inp_ip_ttl = optval;
1083                                 break;
1084
1085                         case IP_MINTTL:
1086                                 if (optval >= 0 && optval <= MAXTTL)
1087                                         inp->inp_ip_minttl = optval;
1088                                 else
1089                                         error = EINVAL;
1090                                 break;
1091
1092 #define OPTSET(bit) do {                                                \
1093         INP_WLOCK(inp);                                                 \
1094         if (optval)                                                     \
1095                 inp->inp_flags |= bit;                                  \
1096         else                                                            \
1097                 inp->inp_flags &= ~bit;                                 \
1098         INP_WUNLOCK(inp);                                               \
1099 } while (0)
1100
1101 #define OPTSET2(bit, val) do {                                          \
1102         INP_WLOCK(inp);                                                 \
1103         if (val)                                                        \
1104                 inp->inp_flags2 |= bit;                                 \
1105         else                                                            \
1106                 inp->inp_flags2 &= ~bit;                                \
1107         INP_WUNLOCK(inp);                                               \
1108 } while (0)
1109
1110                         case IP_RECVOPTS:
1111                                 OPTSET(INP_RECVOPTS);
1112                                 break;
1113
1114                         case IP_RECVRETOPTS:
1115                                 OPTSET(INP_RECVRETOPTS);
1116                                 break;
1117
1118                         case IP_RECVDSTADDR:
1119                                 OPTSET(INP_RECVDSTADDR);
1120                                 break;
1121
1122                         case IP_ORIGDSTADDR:
1123                                 OPTSET2(INP_ORIGDSTADDR, optval);
1124                                 break;
1125
1126                         case IP_RECVTTL:
1127                                 OPTSET(INP_RECVTTL);
1128                                 break;
1129
1130                         case IP_RECVIF:
1131                                 OPTSET(INP_RECVIF);
1132                                 break;
1133
1134                         case IP_ONESBCAST:
1135                                 OPTSET(INP_ONESBCAST);
1136                                 break;
1137                         case IP_DONTFRAG:
1138                                 OPTSET(INP_DONTFRAG);
1139                                 break;
1140                         case IP_BINDANY:
1141                                 OPTSET(INP_BINDANY);
1142                                 break;
1143                         case IP_RECVTOS:
1144                                 OPTSET(INP_RECVTOS);
1145                                 break;
1146                         case IP_BINDMULTI:
1147                                 OPTSET2(INP_BINDMULTI, optval);
1148                                 break;
1149                         case IP_RECVFLOWID:
1150                                 OPTSET2(INP_RECVFLOWID, optval);
1151                                 break;
1152 #ifdef  RSS
1153                         case IP_RSS_LISTEN_BUCKET:
1154                                 if ((optval >= 0) &&
1155                                     (optval < rss_getnumbuckets())) {
1156                                         inp->inp_rss_listen_bucket = optval;
1157                                         OPTSET2(INP_RSS_BUCKET_SET, 1);
1158                                 } else {
1159                                         error = EINVAL;
1160                                 }
1161                                 break;
1162                         case IP_RECVRSSBUCKETID:
1163                                 OPTSET2(INP_RECVRSSBUCKETID, optval);
1164                                 break;
1165 #endif
1166                         }
1167                         break;
1168 #undef OPTSET
1169 #undef OPTSET2
1170
1171                 /*
1172                  * Multicast socket options are processed by the in_mcast
1173                  * module.
1174                  */
1175                 case IP_MULTICAST_IF:
1176                 case IP_MULTICAST_VIF:
1177                 case IP_MULTICAST_TTL:
1178                 case IP_MULTICAST_LOOP:
1179                 case IP_ADD_MEMBERSHIP:
1180                 case IP_DROP_MEMBERSHIP:
1181                 case IP_ADD_SOURCE_MEMBERSHIP:
1182                 case IP_DROP_SOURCE_MEMBERSHIP:
1183                 case IP_BLOCK_SOURCE:
1184                 case IP_UNBLOCK_SOURCE:
1185                 case IP_MSFILTER:
1186                 case MCAST_JOIN_GROUP:
1187                 case MCAST_LEAVE_GROUP:
1188                 case MCAST_JOIN_SOURCE_GROUP:
1189                 case MCAST_LEAVE_SOURCE_GROUP:
1190                 case MCAST_BLOCK_SOURCE:
1191                 case MCAST_UNBLOCK_SOURCE:
1192                         error = inp_setmoptions(inp, sopt);
1193                         break;
1194
1195                 case IP_PORTRANGE:
1196                         error = sooptcopyin(sopt, &optval, sizeof optval,
1197                                             sizeof optval);
1198                         if (error)
1199                                 break;
1200
1201                         INP_WLOCK(inp);
1202                         switch (optval) {
1203                         case IP_PORTRANGE_DEFAULT:
1204                                 inp->inp_flags &= ~(INP_LOWPORT);
1205                                 inp->inp_flags &= ~(INP_HIGHPORT);
1206                                 break;
1207
1208                         case IP_PORTRANGE_HIGH:
1209                                 inp->inp_flags &= ~(INP_LOWPORT);
1210                                 inp->inp_flags |= INP_HIGHPORT;
1211                                 break;
1212
1213                         case IP_PORTRANGE_LOW:
1214                                 inp->inp_flags &= ~(INP_HIGHPORT);
1215                                 inp->inp_flags |= INP_LOWPORT;
1216                                 break;
1217
1218                         default:
1219                                 error = EINVAL;
1220                                 break;
1221                         }
1222                         INP_WUNLOCK(inp);
1223                         break;
1224
1225 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1226                 case IP_IPSEC_POLICY:
1227                         if (IPSEC_ENABLED(ipv4)) {
1228                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1229                                 break;
1230                         }
1231                         /* FALLTHROUGH */
1232 #endif /* IPSEC */
1233
1234                 default:
1235                         error = ENOPROTOOPT;
1236                         break;
1237                 }
1238                 break;
1239
1240         case SOPT_GET:
1241                 switch (sopt->sopt_name) {
1242                 case IP_OPTIONS:
1243                 case IP_RETOPTS:
1244                         if (inp->inp_options)
1245                                 error = sooptcopyout(sopt,
1246                                                      mtod(inp->inp_options,
1247                                                           char *),
1248                                                      inp->inp_options->m_len);
1249                         else
1250                                 sopt->sopt_valsize = 0;
1251                         break;
1252
1253                 case IP_TOS:
1254                 case IP_TTL:
1255                 case IP_MINTTL:
1256                 case IP_RECVOPTS:
1257                 case IP_RECVRETOPTS:
1258                 case IP_ORIGDSTADDR:
1259                 case IP_RECVDSTADDR:
1260                 case IP_RECVTTL:
1261                 case IP_RECVIF:
1262                 case IP_PORTRANGE:
1263                 case IP_ONESBCAST:
1264                 case IP_DONTFRAG:
1265                 case IP_BINDANY:
1266                 case IP_RECVTOS:
1267                 case IP_BINDMULTI:
1268                 case IP_FLOWID:
1269                 case IP_FLOWTYPE:
1270                 case IP_RECVFLOWID:
1271 #ifdef  RSS
1272                 case IP_RSSBUCKETID:
1273                 case IP_RECVRSSBUCKETID:
1274 #endif
1275                         switch (sopt->sopt_name) {
1276
1277                         case IP_TOS:
1278                                 optval = inp->inp_ip_tos;
1279                                 break;
1280
1281                         case IP_TTL:
1282                                 optval = inp->inp_ip_ttl;
1283                                 break;
1284
1285                         case IP_MINTTL:
1286                                 optval = inp->inp_ip_minttl;
1287                                 break;
1288
1289 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
1290 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
1291
1292                         case IP_RECVOPTS:
1293                                 optval = OPTBIT(INP_RECVOPTS);
1294                                 break;
1295
1296                         case IP_RECVRETOPTS:
1297                                 optval = OPTBIT(INP_RECVRETOPTS);
1298                                 break;
1299
1300                         case IP_RECVDSTADDR:
1301                                 optval = OPTBIT(INP_RECVDSTADDR);
1302                                 break;
1303
1304                         case IP_ORIGDSTADDR:
1305                                 optval = OPTBIT2(INP_ORIGDSTADDR);
1306                                 break;
1307
1308                         case IP_RECVTTL:
1309                                 optval = OPTBIT(INP_RECVTTL);
1310                                 break;
1311
1312                         case IP_RECVIF:
1313                                 optval = OPTBIT(INP_RECVIF);
1314                                 break;
1315
1316                         case IP_PORTRANGE:
1317                                 if (inp->inp_flags & INP_HIGHPORT)
1318                                         optval = IP_PORTRANGE_HIGH;
1319                                 else if (inp->inp_flags & INP_LOWPORT)
1320                                         optval = IP_PORTRANGE_LOW;
1321                                 else
1322                                         optval = 0;
1323                                 break;
1324
1325                         case IP_ONESBCAST:
1326                                 optval = OPTBIT(INP_ONESBCAST);
1327                                 break;
1328                         case IP_DONTFRAG:
1329                                 optval = OPTBIT(INP_DONTFRAG);
1330                                 break;
1331                         case IP_BINDANY:
1332                                 optval = OPTBIT(INP_BINDANY);
1333                                 break;
1334                         case IP_RECVTOS:
1335                                 optval = OPTBIT(INP_RECVTOS);
1336                                 break;
1337                         case IP_FLOWID:
1338                                 optval = inp->inp_flowid;
1339                                 break;
1340                         case IP_FLOWTYPE:
1341                                 optval = inp->inp_flowtype;
1342                                 break;
1343                         case IP_RECVFLOWID:
1344                                 optval = OPTBIT2(INP_RECVFLOWID);
1345                                 break;
1346 #ifdef  RSS
1347                         case IP_RSSBUCKETID:
1348                                 retval = rss_hash2bucket(inp->inp_flowid,
1349                                     inp->inp_flowtype,
1350                                     &rss_bucket);
1351                                 if (retval == 0)
1352                                         optval = rss_bucket;
1353                                 else
1354                                         error = EINVAL;
1355                                 break;
1356                         case IP_RECVRSSBUCKETID:
1357                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1358                                 break;
1359 #endif
1360                         case IP_BINDMULTI:
1361                                 optval = OPTBIT2(INP_BINDMULTI);
1362                                 break;
1363                         }
1364                         error = sooptcopyout(sopt, &optval, sizeof optval);
1365                         break;
1366
1367                 /*
1368                  * Multicast socket options are processed by the in_mcast
1369                  * module.
1370                  */
1371                 case IP_MULTICAST_IF:
1372                 case IP_MULTICAST_VIF:
1373                 case IP_MULTICAST_TTL:
1374                 case IP_MULTICAST_LOOP:
1375                 case IP_MSFILTER:
1376                         error = inp_getmoptions(inp, sopt);
1377                         break;
1378
1379 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1380                 case IP_IPSEC_POLICY:
1381                         if (IPSEC_ENABLED(ipv4)) {
1382                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1383                                 break;
1384                         }
1385                         /* FALLTHROUGH */
1386 #endif /* IPSEC */
1387
1388                 default:
1389                         error = ENOPROTOOPT;
1390                         break;
1391                 }
1392                 break;
1393         }
1394         return (error);
1395 }
1396
1397 /*
1398  * Routine called from ip_output() to loop back a copy of an IP multicast
1399  * packet to the input queue of a specified interface.  Note that this
1400  * calls the output routine of the loopback "driver", but with an interface
1401  * pointer that might NOT be a loopback interface -- evil, but easier than
1402  * replicating that code here.
1403  */
1404 static void
1405 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1406 {
1407         struct ip *ip;
1408         struct mbuf *copym;
1409
1410         /*
1411          * Make a deep copy of the packet because we're going to
1412          * modify the pack in order to generate checksums.
1413          */
1414         copym = m_dup(m, M_NOWAIT);
1415         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1416                 copym = m_pullup(copym, hlen);
1417         if (copym != NULL) {
1418                 /* If needed, compute the checksum and mark it as valid. */
1419                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1420                         in_delayed_cksum(copym);
1421                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1422                         copym->m_pkthdr.csum_flags |=
1423                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1424                         copym->m_pkthdr.csum_data = 0xffff;
1425                 }
1426                 /*
1427                  * We don't bother to fragment if the IP length is greater
1428                  * than the interface's MTU.  Can this possibly matter?
1429                  */
1430                 ip = mtod(copym, struct ip *);
1431                 ip->ip_sum = 0;
1432                 ip->ip_sum = in_cksum(copym, hlen);
1433                 if_simloop(ifp, copym, AF_INET, 0);
1434         }
1435 }