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_ipsec.h"
  39 #include "opt_kern_tls.h"
  40 #include "opt_mbuf_stress_test.h"
  41 #include "opt_ratelimit.h"
  42 #include "opt_route.h"
  43 #include "opt_rss.h"
  44 #include "opt_sctp.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/ktls.h>
  50 #include <sys/lock.h>
  51 #include <sys/malloc.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/priv.h>
  54 #include <sys/proc.h>
  55 #include <sys/protosw.h>
  56 #include <sys/rmlock.h>
  57 #include <sys/sdt.h>
  58 #include <sys/socket.h>
  59 #include <sys/socketvar.h>
  60 #include <sys/sysctl.h>
  61 #include <sys/ucred.h>
  62
  63 #include <net/if.h>
  64 #include <net/if_var.h>
  65 #include <net/if_vlan_var.h>
  66 #include <net/if_llatbl.h>
  67 #include <net/ethernet.h>
  68 #include <net/netisr.h>
  69 #include <net/pfil.h>
  70 #include <net/route.h>
  71 #include <net/route/nhop.h>
  72 #include <net/rss_config.h>
  73 #include <net/vnet.h>
  74
  75 #include <netinet/in.h>
  76 #include <netinet/in_fib.h>
  77 #include <netinet/in_kdtrace.h>
  78 #include <netinet/in_systm.h>
  79 #include <netinet/ip.h>
  80 #include <netinet/in_fib.h>
  81 #include <netinet/in_pcb.h>
  82 #include <netinet/in_rss.h>
  83 #include <netinet/in_var.h>
  84 #include <netinet/ip_var.h>
  85 #include <netinet/ip_options.h>
  86 #include <netinet/ip_mroute.h>
  87
  88 #include <netinet/udp.h>
  89 #include <netinet/udp_var.h>
  90
  91 #if defined(SCTP) || defined(SCTP_SUPPORT)
  92 #include <netinet/sctp.h>
  93 #include <netinet/sctp_crc32.h>
  94 #endif
  95
  96 #include <netipsec/ipsec_support.h>
  97
  98 #include <machine/in_cksum.h>
  99
 100 #include <security/mac/mac_framework.h>
 101
 102 #ifdef MBUF_STRESS_TEST
 103 static int mbuf_frag_size = 0;
 104 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
 105         &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
 106 #endif
 107
 108 static void     ip_mloopback(struct ifnet *, const struct mbuf *, int);
 109
 110 extern int in_mcast_loop;
 111 extern  struct protosw inetsw[];
 112
 113 static inline int
 114 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags,
 115     struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error)
 116 {
 117         struct m_tag *fwd_tag = NULL;
 118         struct mbuf *m;
 119         struct in_addr odst;
 120         struct ip *ip;
 121         int pflags = PFIL_OUT;
 122
 123         if (flags & IP_FORWARDING)
 124                 pflags |= PFIL_FWD;
 125
 126         m = *mp;
 127         ip = mtod(m, struct ip *);
 128
 129         /* Run through list of hooks for output packets. */
 130         odst.s_addr = ip->ip_dst.s_addr;
 131         switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, pflags, inp)) {
 132         case PFIL_DROPPED:
 133                 *error = EACCES;
 134                 /* FALLTHROUGH */
 135         case PFIL_CONSUMED:
 136                 return 1; /* Finished */
 137         case PFIL_PASS:
 138                 *error = 0;
 139         }
 140         m = *mp;
 141         ip = mtod(m, struct ip *);
 142
 143         /* See if destination IP address was changed by packet filter. */
 144         if (odst.s_addr != ip->ip_dst.s_addr) {
 145                 m->m_flags |= M_SKIP_FIREWALL;
 146                 /* If destination is now ourself drop to ip_input(). */
 147                 if (in_localip(ip->ip_dst)) {
 148                         m->m_flags |= M_FASTFWD_OURS;
 149                         if (m->m_pkthdr.rcvif == NULL)
 150                                 m->m_pkthdr.rcvif = V_loif;
 151                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 152                                 m->m_pkthdr.csum_flags |=
 153                                         CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 154                                 m->m_pkthdr.csum_data = 0xffff;
 155                         }
 156                         m->m_pkthdr.csum_flags |=
 157                                 CSUM_IP_CHECKED | CSUM_IP_VALID;
 158 #if defined(SCTP) || defined(SCTP_SUPPORT)
 159                         if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 160                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 161 #endif
 162                         *error = netisr_queue(NETISR_IP, m);
 163                         return 1; /* Finished */
 164                 }
 165
 166                 bzero(dst, sizeof(*dst));
 167                 dst->sin_family = AF_INET;
 168                 dst->sin_len = sizeof(*dst);
 169                 dst->sin_addr = ip->ip_dst;
 170
 171                 return -1; /* Reloop */
 172         }
 173         /* See if fib was changed by packet filter. */
 174         if ((*fibnum) != M_GETFIB(m)) {
 175                 m->m_flags |= M_SKIP_FIREWALL;
 176                 *fibnum = M_GETFIB(m);
 177                 return -1; /* Reloop for FIB change */
 178         }
 179
 180         /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
 181         if (m->m_flags & M_FASTFWD_OURS) {
 182                 if (m->m_pkthdr.rcvif == NULL)
 183                         m->m_pkthdr.rcvif = V_loif;
 184                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 185                         m->m_pkthdr.csum_flags |=
 186                                 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 187                         m->m_pkthdr.csum_data = 0xffff;
 188                 }
 189 #if defined(SCTP) || defined(SCTP_SUPPORT)
 190                 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 191                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 192 #endif
 193                 m->m_pkthdr.csum_flags |=
 194                         CSUM_IP_CHECKED | CSUM_IP_VALID;
 195
 196                 *error = netisr_queue(NETISR_IP, m);
 197                 return 1; /* Finished */
 198         }
 199         /* Or forward to some other address? */
 200         if ((m->m_flags & M_IP_NEXTHOP) &&
 201             ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
 202                 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
 203                 m->m_flags |= M_SKIP_FIREWALL;
 204                 m->m_flags &= ~M_IP_NEXTHOP;
 205                 m_tag_delete(m, fwd_tag);
 206
 207                 return -1; /* Reloop for CHANGE of dst */
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int
 214 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m,
 215     const struct sockaddr *gw, struct route *ro, bool stamp_tag)
 216 {
 217 #ifdef KERN_TLS
 218         struct ktls_session *tls = NULL;
 219 #endif
 220         struct m_snd_tag *mst;
 221         int error;
 222
 223         MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
 224         mst = NULL;
 225
 226 #ifdef KERN_TLS
 227         /*
 228          * If this is an unencrypted TLS record, save a reference to
 229          * the record.  This local reference is used to call
 230          * ktls_output_eagain after the mbuf has been freed (thus
 231          * dropping the mbuf's reference) in if_output.
 232          */
 233         if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
 234                 tls = ktls_hold(m->m_next->m_epg_tls);
 235                 mst = tls->snd_tag;
 236
 237                 /*
 238                  * If a TLS session doesn't have a valid tag, it must
 239                  * have had an earlier ifp mismatch, so drop this
 240                  * packet.
 241                  */
 242                 if (mst == NULL) {
 243                         error = EAGAIN;
 244                         goto done;
 245                 }
 246                 /*
 247                  * Always stamp tags that include NIC ktls.
 248                  */
 249                 stamp_tag = true;
 250         }
 251 #endif
 252 #ifdef RATELIMIT
 253         if (inp != NULL && mst == NULL) {
 254                 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
 255                     (inp->inp_snd_tag != NULL &&
 256                     inp->inp_snd_tag->ifp != ifp))
 257                         in_pcboutput_txrtlmt(inp, ifp, m);
 258
 259                 if (inp->inp_snd_tag != NULL)
 260                         mst = inp->inp_snd_tag;
 261         }
 262 #endif
 263         if (stamp_tag && mst != NULL) {
 264                 KASSERT(m->m_pkthdr.rcvif == NULL,
 265                     ("trying to add a send tag to a forwarded packet"));
 266                 if (mst->ifp != ifp) {
 267                         error = EAGAIN;
 268                         goto done;
 269                 }
 270
 271                 /* stamp send tag on mbuf */
 272                 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
 273                 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
 274         }
 275
 276         error = (*ifp->if_output)(ifp, m, gw, ro);
 277
 278 done:
 279         /* Check for route change invalidating send tags. */
 280 #ifdef KERN_TLS
 281         if (tls != NULL) {
 282                 if (error == EAGAIN)
 283                         error = ktls_output_eagain(inp, tls);
 284                 ktls_free(tls);
 285         }
 286 #endif
 287 #ifdef RATELIMIT
 288         if (error == EAGAIN)
 289                 in_pcboutput_eagain(inp);
 290 #endif
 291         return (error);
 292 }
 293
 294 /* rte<>ro_flags translation */
 295 static inline void
 296 rt_update_ro_flags(struct route *ro, const struct nhop_object *nh)
 297 {
 298         int nh_flags = nh->nh_flags;
 299
 300         ro->ro_flags &= ~ (RT_REJECT|RT_BLACKHOLE|RT_HAS_GW);
 301
 302         ro->ro_flags |= (nh_flags & NHF_REJECT) ? RT_REJECT : 0;
 303         ro->ro_flags |= (nh_flags & NHF_BLACKHOLE) ? RT_BLACKHOLE : 0;
 304         ro->ro_flags |= (nh_flags & NHF_GATEWAY) ? RT_HAS_GW : 0;
 305 }
 306
 307 /*
 308  * IP output.  The packet in mbuf chain m contains a skeletal IP
 309  * header (with len, off, ttl, proto, tos, src, dst).
 310  * The mbuf chain containing the packet will be freed.
 311  * The mbuf opt, if present, will not be freed.
 312  * If route ro is present and has ro_rt initialized, route lookup would be
 313  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 314  * then result of route lookup is stored in ro->ro_rt.
 315  *
 316  * In the IP forwarding case, the packet will arrive with options already
 317  * inserted, so must have a NULL opt pointer.
 318  */
 319 int
 320 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 321     struct ip_moptions *imo, struct inpcb *inp)
 322 {
 323         MROUTER_RLOCK_TRACKER;
 324         struct rm_priotracker in_ifa_tracker;
 325         struct ip *ip;
 326         struct ifnet *ifp = NULL;       /* keep compiler happy */
 327         struct mbuf *m0;
 328         int hlen = sizeof (struct ip);
 329         int mtu = 0;
 330         int error = 0;
 331         int vlan_pcp = -1;
 332         struct sockaddr_in *dst;
 333         const struct sockaddr *gw;
 334         struct in_ifaddr *ia = NULL;
 335         struct in_addr src;
 336         int isbroadcast;
 337         uint16_t ip_len, ip_off;
 338         struct route iproute;
 339         uint32_t fibnum;
 340 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 341         int no_route_but_check_spd = 0;
 342 #endif
 343
 344         M_ASSERTPKTHDR(m);
 345         NET_EPOCH_ASSERT();
 346
 347         if (inp != NULL) {
 348                 INP_LOCK_ASSERT(inp);
 349                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 350                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 351                         m->m_pkthdr.flowid = inp->inp_flowid;
 352                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 353                 }
 354                 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
 355                         vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
 356                             INP_2PCP_SHIFT;
 357 #ifdef NUMA
 358                 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
 359 #endif
 360         }
 361
 362         if (opt) {
 363                 int len = 0;
 364                 m = ip_insertoptions(m, opt, &len);
 365                 if (len != 0)
 366                         hlen = len; /* ip->ip_hl is updated above */
 367         }
 368         ip = mtod(m, struct ip *);
 369         ip_len = ntohs(ip->ip_len);
 370         ip_off = ntohs(ip->ip_off);
 371
 372         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
 373                 ip->ip_v = IPVERSION;
 374                 ip->ip_hl = hlen >> 2;
 375                 ip_fillid(ip);
 376         } else {
 377                 /* Header already set, fetch hlen from there */
 378                 hlen = ip->ip_hl << 2;
 379         }
 380         if ((flags & IP_FORWARDING) == 0)
 381                 IPSTAT_INC(ips_localout);
 382
 383         /*
 384          * dst/gw handling:
 385          *
 386          * gw is readonly but can point either to dst OR rt_gateway,
 387          * therefore we need restore gw if we're redoing lookup.
 388          */
 389         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 390         if (ro == NULL) {
 391                 ro = &iproute;
 392                 bzero(ro, sizeof (*ro));
 393         }
 394         dst = (struct sockaddr_in *)&ro->ro_dst;
 395         if (ro->ro_nh == NULL) {
 396                 dst->sin_family = AF_INET;
 397                 dst->sin_len = sizeof(*dst);
 398                 dst->sin_addr = ip->ip_dst;
 399         }
 400         gw = (const struct sockaddr *)dst;
 401 again:
 402         /*
 403          * Validate route against routing table additions;
 404          * a better/more specific route might have been added.
 405          */
 406         if (inp != NULL && ro->ro_nh != NULL)
 407                 NH_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
 408         /*
 409          * If there is a cached route,
 410          * check that it is to the same destination
 411          * and is still up.  If not, free it and try again.
 412          * The address family should also be checked in case of sharing the
 413          * cache with IPv6.
 414          * Also check whether routing cache needs invalidation.
 415          */
 416         if (ro->ro_nh != NULL &&
 417             ((!NH_IS_VALID(ro->ro_nh)) || dst->sin_family != AF_INET ||
 418             dst->sin_addr.s_addr != ip->ip_dst.s_addr))
 419                 RO_INVALIDATE_CACHE(ro);
 420         ia = NULL;
 421         /*
 422          * If routing to interface only, short circuit routing lookup.
 423          * The use of an all-ones broadcast address implies this; an
 424          * interface is specified by the broadcast address of an interface,
 425          * or the destination address of a ptp interface.
 426          */
 427         if (flags & IP_SENDONES) {
 428                 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
 429                                                       M_GETFIB(m)))) == NULL &&
 430                     (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 431                                                     M_GETFIB(m)))) == NULL) {
 432                         IPSTAT_INC(ips_noroute);
 433                         error = ENETUNREACH;
 434                         goto bad;
 435                 }
 436                 ip->ip_dst.s_addr = INADDR_BROADCAST;
 437                 dst->sin_addr = ip->ip_dst;
 438                 ifp = ia->ia_ifp;
 439                 mtu = ifp->if_mtu;
 440                 ip->ip_ttl = 1;
 441                 isbroadcast = 1;
 442                 src = IA_SIN(ia)->sin_addr;
 443         } else if (flags & IP_ROUTETOIF) {
 444                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 445                                                     M_GETFIB(m)))) == NULL &&
 446                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
 447                                                 M_GETFIB(m)))) == NULL) {
 448                         IPSTAT_INC(ips_noroute);
 449                         error = ENETUNREACH;
 450                         goto bad;
 451                 }
 452                 ifp = ia->ia_ifp;
 453                 mtu = ifp->if_mtu;
 454                 ip->ip_ttl = 1;
 455                 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
 456                     in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
 457                 src = IA_SIN(ia)->sin_addr;
 458         } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
 459             imo != NULL && imo->imo_multicast_ifp != NULL) {
 460                 /*
 461                  * Bypass the normal routing lookup for multicast
 462                  * packets if the interface is specified.
 463                  */
 464                 ifp = imo->imo_multicast_ifp;
 465                 mtu = ifp->if_mtu;
 466                 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
 467                 isbroadcast = 0;        /* fool gcc */
 468                 /* Interface may have no addresses. */
 469                 if (ia != NULL)
 470                         src = IA_SIN(ia)->sin_addr;
 471                 else
 472                         src.s_addr = INADDR_ANY;
 473         } else if (ro != &iproute) {
 474                 if (ro->ro_nh == NULL) {
 475                         /*
 476                          * We want to do any cloning requested by the link
 477                          * layer, as this is probably required in all cases
 478                          * for correct operation (as it is for ARP).
 479                          */
 480                         uint32_t flowid;
 481                         flowid = m->m_pkthdr.flowid;
 482                         ro->ro_nh = fib4_lookup(fibnum, dst->sin_addr, 0,
 483                             NHR_REF, flowid);
 484
 485                         if (ro->ro_nh == NULL || (!NH_IS_VALID(ro->ro_nh))) {
 486 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 487                                 /*
 488                                  * There is no route for this packet, but it is
 489                                  * possible that a matching SPD entry exists.
 490                                  */
 491                                 no_route_but_check_spd = 1;
 492                                 goto sendit;
 493 #endif
 494                                 IPSTAT_INC(ips_noroute);
 495                                 error = EHOSTUNREACH;
 496                                 goto bad;
 497                         }
 498                 }
 499                 struct nhop_object *nh = ro->ro_nh;
 500
 501                 ia = ifatoia(nh->nh_ifa);
 502                 ifp = nh->nh_ifp;
 503                 counter_u64_add(nh->nh_pksent, 1);
 504                 rt_update_ro_flags(ro, nh);
 505                 if (nh->nh_flags & NHF_GATEWAY)
 506                         gw = &nh->gw_sa;
 507                 if (nh->nh_flags & NHF_HOST)
 508                         isbroadcast = (nh->nh_flags & NHF_BROADCAST);
 509                 else if ((ifp->if_flags & IFF_BROADCAST) && (gw->sa_family == AF_INET))
 510                         isbroadcast = in_ifaddr_broadcast(((const struct sockaddr_in *)gw)->sin_addr, ia);
 511                 else
 512                         isbroadcast = 0;
 513                 mtu = nh->nh_mtu;
 514                 src = IA_SIN(ia)->sin_addr;
 515         } else {
 516                 struct nhop_object *nh;
 517
 518                 nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_NONE,
 519                     m->m_pkthdr.flowid);
 520                 if (nh == NULL) {
 521 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 522                         /*
 523                          * There is no route for this packet, but it is
 524                          * possible that a matching SPD entry exists.
 525                          */
 526                         no_route_but_check_spd = 1;
 527                         goto sendit;
 528 #endif
 529                         IPSTAT_INC(ips_noroute);
 530                         error = EHOSTUNREACH;
 531                         goto bad;
 532                 }
 533                 ifp = nh->nh_ifp;
 534                 mtu = nh->nh_mtu;
 535                 rt_update_ro_flags(ro, nh);
 536                 if (nh->nh_flags & NHF_GATEWAY)
 537                         gw = &nh->gw_sa;
 538                 ia = ifatoia(nh->nh_ifa);
 539                 src = IA_SIN(ia)->sin_addr;
 540                 isbroadcast = (((nh->nh_flags & (NHF_HOST | NHF_BROADCAST)) ==
 541                     (NHF_HOST | NHF_BROADCAST)) ||
 542                     ((ifp->if_flags & IFF_BROADCAST) &&
 543                     (gw->sa_family == AF_INET) &&
 544                     in_ifaddr_broadcast(((const struct sockaddr_in *)gw)->sin_addr, ia)));
 545         }
 546
 547         /* Catch a possible divide by zero later. */
 548         KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (nh_flags=0x%08x) ifp=%p",
 549             __func__, mtu, ro,
 550             (ro != NULL && ro->ro_nh != NULL) ? ro->ro_nh->nh_flags : 0, ifp));
 551
 552         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 553                 m->m_flags |= M_MCAST;
 554                 /*
 555                  * IP destination address is multicast.  Make sure "gw"
 556                  * still points to the address in "ro".  (It may have been
 557                  * changed to point to a gateway address, above.)
 558                  */
 559                 gw = (const struct sockaddr *)dst;
 560                 /*
 561                  * See if the caller provided any multicast options
 562                  */
 563                 if (imo != NULL) {
 564                         ip->ip_ttl = imo->imo_multicast_ttl;
 565                         if (imo->imo_multicast_vif != -1)
 566                                 ip->ip_src.s_addr =
 567                                     ip_mcast_src ?
 568                                     ip_mcast_src(imo->imo_multicast_vif) :
 569                                     INADDR_ANY;
 570                 } else
 571                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
 572                 /*
 573                  * Confirm that the outgoing interface supports multicast.
 574                  */
 575                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
 576                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
 577                                 IPSTAT_INC(ips_noroute);
 578                                 error = ENETUNREACH;
 579                                 goto bad;
 580                         }
 581                 }
 582                 /*
 583                  * If source address not specified yet, use address
 584                  * of outgoing interface.
 585                  */
 586                 if (ip->ip_src.s_addr == INADDR_ANY)
 587                         ip->ip_src = src;
 588
 589                 if ((imo == NULL && in_mcast_loop) ||
 590                     (imo && imo->imo_multicast_loop)) {
 591                         /*
 592                          * Loop back multicast datagram if not expressly
 593                          * forbidden to do so, even if we are not a member
 594                          * of the group; ip_input() will filter it later,
 595                          * thus deferring a hash lookup and mutex acquisition
 596                          * at the expense of a cheap copy using m_copym().
 597                          */
 598                         ip_mloopback(ifp, m, hlen);
 599                 } else {
 600                         /*
 601                          * If we are acting as a multicast router, perform
 602                          * multicast forwarding as if the packet had just
 603                          * arrived on the interface to which we are about
 604                          * to send.  The multicast forwarding function
 605                          * recursively calls this function, using the
 606                          * IP_FORWARDING flag to prevent infinite recursion.
 607                          *
 608                          * Multicasts that are looped back by ip_mloopback(),
 609                          * above, will be forwarded by the ip_input() routine,
 610                          * if necessary.
 611                          */
 612                         MROUTER_RLOCK();
 613                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
 614                                 /*
 615                                  * If rsvp daemon is not running, do not
 616                                  * set ip_moptions. This ensures that the packet
 617                                  * is multicast and not just sent down one link
 618                                  * as prescribed by rsvpd.
 619                                  */
 620                                 if (!V_rsvp_on)
 621                                         imo = NULL;
 622                                 if (ip_mforward &&
 623                                     ip_mforward(ip, ifp, m, imo) != 0) {
 624                                         MROUTER_RUNLOCK();
 625                                         m_freem(m);
 626                                         goto done;
 627                                 }
 628                         }
 629                         MROUTER_RUNLOCK();
 630                 }
 631
 632                 /*
 633                  * Multicasts with a time-to-live of zero may be looped-
 634                  * back, above, but must not be transmitted on a network.
 635                  * Also, multicasts addressed to the loopback interface
 636                  * are not sent -- the above call to ip_mloopback() will
 637                  * loop back a copy. ip_input() will drop the copy if
 638                  * this host does not belong to the destination group on
 639                  * the loopback interface.
 640                  */
 641                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
 642                         m_freem(m);
 643                         goto done;
 644                 }
 645
 646                 goto sendit;
 647         }
 648
 649         /*
 650          * If the source address is not specified yet, use the address
 651          * of the outoing interface.
 652          */
 653         if (ip->ip_src.s_addr == INADDR_ANY)
 654                 ip->ip_src = src;
 655
 656         /*
 657          * Look for broadcast address and
 658          * verify user is allowed to send
 659          * such a packet.
 660          */
 661         if (isbroadcast) {
 662                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 663                         error = EADDRNOTAVAIL;
 664                         goto bad;
 665                 }
 666                 if ((flags & IP_ALLOWBROADCAST) == 0) {
 667                         error = EACCES;
 668                         goto bad;
 669                 }
 670                 /* don't allow broadcast messages to be fragmented */
 671                 if (ip_len > mtu) {
 672                         error = EMSGSIZE;
 673                         goto bad;
 674                 }
 675                 m->m_flags |= M_BCAST;
 676         } else {
 677                 m->m_flags &= ~M_BCAST;
 678         }
 679
 680 sendit:
 681 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 682         if (IPSEC_ENABLED(ipv4)) {
 683                 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
 684                         if (error == EINPROGRESS)
 685                                 error = 0;
 686                         goto done;
 687                 }
 688         }
 689         /*
 690          * Check if there was a route for this packet; return error if not.
 691          */
 692         if (no_route_but_check_spd) {
 693                 IPSTAT_INC(ips_noroute);
 694                 error = EHOSTUNREACH;
 695                 goto bad;
 696         }
 697         /* Update variables that are affected by ipsec4_output(). */
 698         ip = mtod(m, struct ip *);
 699         hlen = ip->ip_hl << 2;
 700 #endif /* IPSEC */
 701
 702         /* Jump over all PFIL processing if hooks are not active. */
 703         if (PFIL_HOOKED_OUT(V_inet_pfil_head)) {
 704                 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum,
 705                     &error)) {
 706                 case 1: /* Finished */
 707                         goto done;
 708
 709                 case 0: /* Continue normally */
 710                         ip = mtod(m, struct ip *);
 711                         break;
 712
 713                 case -1: /* Need to try again */
 714                         /* Reset everything for a new round */
 715                         if (ro != NULL) {
 716                                 RO_NHFREE(ro);
 717                                 ro->ro_prepend = NULL;
 718                         }
 719                         gw = (const struct sockaddr *)dst;
 720                         ip = mtod(m, struct ip *);
 721                         goto again;
 722                 }
 723         }
 724
 725         if (vlan_pcp > -1)
 726                 EVL_APPLY_PRI(m, vlan_pcp);
 727
 728         /* IN_LOOPBACK must not appear on the wire - RFC1122. */
 729         if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
 730             IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
 731                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
 732                         IPSTAT_INC(ips_badaddr);
 733                         error = EADDRNOTAVAIL;
 734                         goto bad;
 735                 }
 736         }
 737
 738         m->m_pkthdr.csum_flags |= CSUM_IP;
 739         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
 740                 m = mb_unmapped_to_ext(m);
 741                 if (m == NULL) {
 742                         IPSTAT_INC(ips_odropped);
 743                         error = ENOBUFS;
 744                         goto bad;
 745                 }
 746                 in_delayed_cksum(m);
 747                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 748         } else if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) {
 749                 m = mb_unmapped_to_ext(m);
 750                 if (m == NULL) {
 751                         IPSTAT_INC(ips_odropped);
 752                         error = ENOBUFS;
 753                         goto bad;
 754                 }
 755         }
 756 #if defined(SCTP) || defined(SCTP_SUPPORT)
 757         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
 758                 m = mb_unmapped_to_ext(m);
 759                 if (m == NULL) {
 760                         IPSTAT_INC(ips_odropped);
 761                         error = ENOBUFS;
 762                         goto bad;
 763                 }
 764                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
 765                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 766         }
 767 #endif
 768
 769         /*
 770          * If small enough for interface, or the interface will take
 771          * care of the fragmentation for us, we can just send directly.
 772          * Note that if_vxlan could have requested TSO even though the outer
 773          * frame is UDP.  It is correct to not fragment such datagrams and
 774          * instead just pass them on to the driver.
 775          */
 776         if (ip_len <= mtu ||
 777             (m->m_pkthdr.csum_flags & ifp->if_hwassist &
 778             (CSUM_TSO | CSUM_INNER_TSO)) != 0) {
 779                 ip->ip_sum = 0;
 780                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
 781                         ip->ip_sum = in_cksum(m, hlen);
 782                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 783                 }
 784
 785                 /*
 786                  * Record statistics for this interface address.
 787                  * With CSUM_TSO the byte/packet count will be slightly
 788                  * incorrect because we count the IP+TCP headers only
 789                  * once instead of for every generated packet.
 790                  */
 791                 if (!(flags & IP_FORWARDING) && ia) {
 792                         if (m->m_pkthdr.csum_flags &
 793                             (CSUM_TSO | CSUM_INNER_TSO))
 794                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
 795                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
 796                         else
 797                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 798
 799                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
 800                 }
 801 #ifdef MBUF_STRESS_TEST
 802                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
 803                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
 804 #endif
 805                 /*
 806                  * Reset layer specific mbuf flags
 807                  * to avoid confusing lower layers.
 808                  */
 809                 m_clrprotoflags(m);
 810                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
 811                 error = ip_output_send(inp, ifp, m, gw, ro,
 812                     (flags & IP_NO_SND_TAG_RL) ? false : true);
 813                 goto done;
 814         }
 815
 816         /* Balk when DF bit is set or the interface didn't support TSO. */
 817         if ((ip_off & IP_DF) ||
 818             (m->m_pkthdr.csum_flags & (CSUM_TSO | CSUM_INNER_TSO))) {
 819                 error = EMSGSIZE;
 820                 IPSTAT_INC(ips_cantfrag);
 821                 goto bad;
 822         }
 823
 824         /*
 825          * Too large for interface; fragment if possible. If successful,
 826          * on return, m will point to a list of packets to be sent.
 827          */
 828         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
 829         if (error)
 830                 goto bad;
 831         for (; m; m = m0) {
 832                 m0 = m->m_nextpkt;
 833                 m->m_nextpkt = 0;
 834                 if (error == 0) {
 835                         /* Record statistics for this interface address. */
 836                         if (ia != NULL) {
 837                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 838                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 839                                     m->m_pkthdr.len);
 840                         }
 841                         /*
 842                          * Reset layer specific mbuf flags
 843                          * to avoid confusing upper layers.
 844                          */
 845                         m_clrprotoflags(m);
 846
 847                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
 848                             mtod(m, struct ip *), NULL);
 849                         error = ip_output_send(inp, ifp, m, gw, ro, true);
 850                 } else
 851                         m_freem(m);
 852         }
 853
 854         if (error == 0)
 855                 IPSTAT_INC(ips_fragmented);
 856
 857 done:
 858         return (error);
 859  bad:
 860         m_freem(m);
 861         goto done;
 862 }
 863
 864 /*
 865  * Create a chain of fragments which fit the given mtu. m_frag points to the
 866  * mbuf to be fragmented; on return it points to the chain with the fragments.
 867  * Return 0 if no error. If error, m_frag may contain a partially built
 868  * chain of fragments that should be freed by the caller.
 869  *
 870  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
 871  */
 872 int
 873 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 874     u_long if_hwassist_flags)
 875 {
 876         int error = 0;
 877         int hlen = ip->ip_hl << 2;
 878         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
 879         int off;
 880         struct mbuf *m0 = *m_frag;      /* the original packet          */
 881         int firstlen;
 882         struct mbuf **mnext;
 883         int nfrags;
 884         uint16_t ip_len, ip_off;
 885
 886         ip_len = ntohs(ip->ip_len);
 887         ip_off = ntohs(ip->ip_off);
 888
 889         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
 890                 IPSTAT_INC(ips_cantfrag);
 891                 return EMSGSIZE;
 892         }
 893
 894         /*
 895          * Must be able to put at least 8 bytes per fragment.
 896          */
 897         if (len < 8)
 898                 return EMSGSIZE;
 899
 900         /*
 901          * If the interface will not calculate checksums on
 902          * fragmented packets, then do it here.
 903          */
 904         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 905                 m0 = mb_unmapped_to_ext(m0);
 906                 if (m0 == NULL) {
 907                         error = ENOBUFS;
 908                         IPSTAT_INC(ips_odropped);
 909                         goto done;
 910                 }
 911                 in_delayed_cksum(m0);
 912                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 913         }
 914 #if defined(SCTP) || defined(SCTP_SUPPORT)
 915         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
 916                 m0 = mb_unmapped_to_ext(m0);
 917                 if (m0 == NULL) {
 918                         error = ENOBUFS;
 919                         IPSTAT_INC(ips_odropped);
 920                         goto done;
 921                 }
 922                 sctp_delayed_cksum(m0, hlen);
 923                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 924         }
 925 #endif
 926         if (len > PAGE_SIZE) {
 927                 /*
 928                  * Fragment large datagrams such that each segment
 929                  * contains a multiple of PAGE_SIZE amount of data,
 930                  * plus headers. This enables a receiver to perform
 931                  * page-flipping zero-copy optimizations.
 932                  *
 933                  * XXX When does this help given that sender and receiver
 934                  * could have different page sizes, and also mtu could
 935                  * be less than the receiver's page size ?
 936                  */
 937                 int newlen;
 938
 939                 off = MIN(mtu, m0->m_pkthdr.len);
 940
 941                 /*
 942                  * firstlen (off - hlen) must be aligned on an
 943                  * 8-byte boundary
 944                  */
 945                 if (off < hlen)
 946                         goto smart_frag_failure;
 947                 off = ((off - hlen) & ~7) + hlen;
 948                 newlen = (~PAGE_MASK) & mtu;
 949                 if ((newlen + sizeof (struct ip)) > mtu) {
 950                         /* we failed, go back the default */
 951 smart_frag_failure:
 952                         newlen = len;
 953                         off = hlen + len;
 954                 }
 955                 len = newlen;
 956
 957         } else {
 958                 off = hlen + len;
 959         }
 960
 961         firstlen = off - hlen;
 962         mnext = &m0->m_nextpkt;         /* pointer to next packet */
 963
 964         /*
 965          * Loop through length of segment after first fragment,
 966          * make new header and copy data of each part and link onto chain.
 967          * Here, m0 is the original packet, m is the fragment being created.
 968          * The fragments are linked off the m_nextpkt of the original
 969          * packet, which after processing serves as the first fragment.
 970          */
 971         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
 972                 struct ip *mhip;        /* ip header on the fragment */
 973                 struct mbuf *m;
 974                 int mhlen = sizeof (struct ip);
 975
 976                 m = m_gethdr(M_NOWAIT, MT_DATA);
 977                 if (m == NULL) {
 978                         error = ENOBUFS;
 979                         IPSTAT_INC(ips_odropped);
 980                         goto done;
 981                 }
 982                 /*
 983                  * Make sure the complete packet header gets copied
 984                  * from the originating mbuf to the newly created
 985                  * mbuf. This also ensures that existing firewall
 986                  * classification(s), VLAN tags and so on get copied
 987                  * to the resulting fragmented packet(s):
 988                  */
 989                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 990                         m_free(m);
 991                         error = ENOBUFS;
 992                         IPSTAT_INC(ips_odropped);
 993                         goto done;
 994                 }
 995                 /*
 996                  * In the first mbuf, leave room for the link header, then
 997                  * copy the original IP header including options. The payload
 998                  * goes into an additional mbuf chain returned by m_copym().
 999                  */
1000                 m->m_data += max_linkhdr;
1001                 mhip = mtod(m, struct ip *);
1002                 *mhip = *ip;
1003                 if (hlen > sizeof (struct ip)) {
1004                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
1005                         mhip->ip_v = IPVERSION;
1006                         mhip->ip_hl = mhlen >> 2;
1007                 }
1008                 m->m_len = mhlen;
1009                 /* XXX do we need to add ip_off below ? */
1010                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
1011                 if (off + len >= ip_len)
1012                         len = ip_len - off;
1013                 else
1014                         mhip->ip_off |= IP_MF;
1015                 mhip->ip_len = htons((u_short)(len + mhlen));
1016                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
1017                 if (m->m_next == NULL) {        /* copy failed */
1018                         m_free(m);
1019                         error = ENOBUFS;        /* ??? */
1020                         IPSTAT_INC(ips_odropped);
1021                         goto done;
1022                 }
1023                 m->m_pkthdr.len = mhlen + len;
1024 #ifdef MAC
1025                 mac_netinet_fragment(m0, m);
1026 #endif
1027                 mhip->ip_off = htons(mhip->ip_off);
1028                 mhip->ip_sum = 0;
1029                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1030                         mhip->ip_sum = in_cksum(m, mhlen);
1031                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
1032                 }
1033                 *mnext = m;
1034                 mnext = &m->m_nextpkt;
1035         }
1036         IPSTAT_ADD(ips_ofragments, nfrags);
1037
1038         /*
1039          * Update first fragment by trimming what's been copied out
1040          * and updating header.
1041          */
1042         m_adj(m0, hlen + firstlen - ip_len);
1043         m0->m_pkthdr.len = hlen + firstlen;
1044         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
1045         ip->ip_off = htons(ip_off | IP_MF);
1046         ip->ip_sum = 0;
1047         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1048                 ip->ip_sum = in_cksum(m0, hlen);
1049                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
1050         }
1051
1052 done:
1053         *m_frag = m0;
1054         return error;
1055 }
1056
1057 void
1058 in_delayed_cksum(struct mbuf *m)
1059 {
1060         struct ip *ip;
1061         struct udphdr *uh;
1062         uint16_t cklen, csum, offset;
1063
1064         ip = mtod(m, struct ip *);
1065         offset = ip->ip_hl << 2 ;
1066
1067         if (m->m_pkthdr.csum_flags & CSUM_UDP) {
1068                 /* if udp header is not in the first mbuf copy udplen */
1069                 if (offset + sizeof(struct udphdr) > m->m_len) {
1070                         m_copydata(m, offset + offsetof(struct udphdr,
1071                             uh_ulen), sizeof(cklen), (caddr_t)&cklen);
1072                         cklen = ntohs(cklen);
1073                 } else {
1074                         uh = (struct udphdr *)mtodo(m, offset);
1075                         cklen = ntohs(uh->uh_ulen);
1076                 }
1077                 csum = in_cksum_skip(m, cklen + offset, offset);
1078                 if (csum == 0)
1079                         csum = 0xffff;
1080         } else {
1081                 cklen = ntohs(ip->ip_len);
1082                 csum = in_cksum_skip(m, cklen, offset);
1083         }
1084         offset += m->m_pkthdr.csum_data;        /* checksum offset */
1085
1086         if (offset + sizeof(csum) > m->m_len)
1087                 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
1088         else
1089                 *(u_short *)mtodo(m, offset) = csum;
1090 }
1091
1092 /*
1093  * IP socket option processing.
1094  */
1095 int
1096 ip_ctloutput(struct socket *so, struct sockopt *sopt)
1097 {
1098         struct inpcb *inp = sotoinpcb(so);
1099         int     error, optval;
1100 #ifdef  RSS
1101         uint32_t rss_bucket;
1102         int retval;
1103 #endif
1104
1105         error = optval = 0;
1106         if (sopt->sopt_level != IPPROTO_IP) {
1107                 error = EINVAL;
1108
1109                 if (sopt->sopt_level == SOL_SOCKET &&
1110                     sopt->sopt_dir == SOPT_SET) {
1111                         switch (sopt->sopt_name) {
1112                         case SO_REUSEADDR:
1113                                 INP_WLOCK(inp);
1114                                 if ((so->so_options & SO_REUSEADDR) != 0)
1115                                         inp->inp_flags2 |= INP_REUSEADDR;
1116                                 else
1117                                         inp->inp_flags2 &= ~INP_REUSEADDR;
1118                                 INP_WUNLOCK(inp);
1119                                 error = 0;
1120                                 break;
1121                         case SO_REUSEPORT:
1122                                 INP_WLOCK(inp);
1123                                 if ((so->so_options & SO_REUSEPORT) != 0)
1124                                         inp->inp_flags2 |= INP_REUSEPORT;
1125                                 else
1126                                         inp->inp_flags2 &= ~INP_REUSEPORT;
1127                                 INP_WUNLOCK(inp);
1128                                 error = 0;
1129                                 break;
1130                         case SO_REUSEPORT_LB:
1131                                 INP_WLOCK(inp);
1132                                 if ((so->so_options & SO_REUSEPORT_LB) != 0)
1133                                         inp->inp_flags2 |= INP_REUSEPORT_LB;
1134                                 else
1135                                         inp->inp_flags2 &= ~INP_REUSEPORT_LB;
1136                                 INP_WUNLOCK(inp);
1137                                 error = 0;
1138                                 break;
1139                         case SO_SETFIB:
1140                                 INP_WLOCK(inp);
1141                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
1142                                 INP_WUNLOCK(inp);
1143                                 error = 0;
1144                                 break;
1145                         case SO_MAX_PACING_RATE:
1146 #ifdef RATELIMIT
1147                                 INP_WLOCK(inp);
1148                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1149                                 INP_WUNLOCK(inp);
1150                                 error = 0;
1151 #else
1152                                 error = EOPNOTSUPP;
1153 #endif
1154                                 break;
1155                         default:
1156                                 break;
1157                         }
1158                 }
1159                 return (error);
1160         }
1161
1162         switch (sopt->sopt_dir) {
1163         case SOPT_SET:
1164                 switch (sopt->sopt_name) {
1165                 case IP_OPTIONS:
1166 #ifdef notyet
1167                 case IP_RETOPTS:
1168 #endif
1169                 {
1170                         struct mbuf *m;
1171                         if (sopt->sopt_valsize > MLEN) {
1172                                 error = EMSGSIZE;
1173                                 break;
1174                         }
1175                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1176                         if (m == NULL) {
1177                                 error = ENOBUFS;
1178                                 break;
1179                         }
1180                         m->m_len = sopt->sopt_valsize;
1181                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1182                                             m->m_len);
1183                         if (error) {
1184                                 m_free(m);
1185                                 break;
1186                         }
1187                         INP_WLOCK(inp);
1188                         error = ip_pcbopts(inp, sopt->sopt_name, m);
1189                         INP_WUNLOCK(inp);
1190                         return (error);
1191                 }
1192
1193                 case IP_BINDANY:
1194                         if (sopt->sopt_td != NULL) {
1195                                 error = priv_check(sopt->sopt_td,
1196                                     PRIV_NETINET_BINDANY);
1197                                 if (error)
1198                                         break;
1199                         }
1200                         /* FALLTHROUGH */
1201                 case IP_BINDMULTI:
1202 #ifdef  RSS
1203                 case IP_RSS_LISTEN_BUCKET:
1204 #endif
1205                 case IP_TOS:
1206                 case IP_TTL:
1207                 case IP_MINTTL:
1208                 case IP_RECVOPTS:
1209                 case IP_RECVRETOPTS:
1210                 case IP_ORIGDSTADDR:
1211                 case IP_RECVDSTADDR:
1212                 case IP_RECVTTL:
1213                 case IP_RECVIF:
1214                 case IP_ONESBCAST:
1215                 case IP_DONTFRAG:
1216                 case IP_RECVTOS:
1217                 case IP_RECVFLOWID:
1218 #ifdef  RSS
1219                 case IP_RECVRSSBUCKETID:
1220 #endif
1221                 case IP_VLAN_PCP:
1222                         error = sooptcopyin(sopt, &optval, sizeof optval,
1223                                             sizeof optval);
1224                         if (error)
1225                                 break;
1226
1227                         switch (sopt->sopt_name) {
1228                         case IP_TOS:
1229                                 inp->inp_ip_tos = optval;
1230                                 break;
1231
1232                         case IP_TTL:
1233                                 inp->inp_ip_ttl = optval;
1234                                 break;
1235
1236                         case IP_MINTTL:
1237                                 if (optval >= 0 && optval <= MAXTTL)
1238                                         inp->inp_ip_minttl = optval;
1239                                 else
1240                                         error = EINVAL;
1241                                 break;
1242
1243 #define OPTSET(bit) do {                                                \
1244         INP_WLOCK(inp);                                                 \
1245         if (optval)                                                     \
1246                 inp->inp_flags |= bit;                                  \
1247         else                                                            \
1248                 inp->inp_flags &= ~bit;                                 \
1249         INP_WUNLOCK(inp);                                               \
1250 } while (0)
1251
1252 #define OPTSET2(bit, val) do {                                          \
1253         INP_WLOCK(inp);                                                 \
1254         if (val)                                                        \
1255                 inp->inp_flags2 |= bit;                                 \
1256         else                                                            \
1257                 inp->inp_flags2 &= ~bit;                                \
1258         INP_WUNLOCK(inp);                                               \
1259 } while (0)
1260
1261                         case IP_RECVOPTS:
1262                                 OPTSET(INP_RECVOPTS);
1263                                 break;
1264
1265                         case IP_RECVRETOPTS:
1266                                 OPTSET(INP_RECVRETOPTS);
1267                                 break;
1268
1269                         case IP_RECVDSTADDR:
1270                                 OPTSET(INP_RECVDSTADDR);
1271                                 break;
1272
1273                         case IP_ORIGDSTADDR:
1274                                 OPTSET2(INP_ORIGDSTADDR, optval);
1275                                 break;
1276
1277                         case IP_RECVTTL:
1278                                 OPTSET(INP_RECVTTL);
1279                                 break;
1280
1281                         case IP_RECVIF:
1282                                 OPTSET(INP_RECVIF);
1283                                 break;
1284
1285                         case IP_ONESBCAST:
1286                                 OPTSET(INP_ONESBCAST);
1287                                 break;
1288                         case IP_DONTFRAG:
1289                                 OPTSET(INP_DONTFRAG);
1290                                 break;
1291                         case IP_BINDANY:
1292                                 OPTSET(INP_BINDANY);
1293                                 break;
1294                         case IP_RECVTOS:
1295                                 OPTSET(INP_RECVTOS);
1296                                 break;
1297                         case IP_BINDMULTI:
1298                                 OPTSET2(INP_BINDMULTI, optval);
1299                                 break;
1300                         case IP_RECVFLOWID:
1301                                 OPTSET2(INP_RECVFLOWID, optval);
1302                                 break;
1303 #ifdef  RSS
1304                         case IP_RSS_LISTEN_BUCKET:
1305                                 if ((optval >= 0) &&
1306                                     (optval < rss_getnumbuckets())) {
1307                                         inp->inp_rss_listen_bucket = optval;
1308                                         OPTSET2(INP_RSS_BUCKET_SET, 1);
1309                                 } else {
1310                                         error = EINVAL;
1311                                 }
1312                                 break;
1313                         case IP_RECVRSSBUCKETID:
1314                                 OPTSET2(INP_RECVRSSBUCKETID, optval);
1315                                 break;
1316 #endif
1317                         case IP_VLAN_PCP:
1318                                 if ((optval >= -1) && (optval <=
1319                                     (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1320                                         if (optval == -1) {
1321                                                 INP_WLOCK(inp);
1322                                                 inp->inp_flags2 &=
1323                                                     ~(INP_2PCP_SET |
1324                                                       INP_2PCP_MASK);
1325                                                 INP_WUNLOCK(inp);
1326                                         } else {
1327                                                 INP_WLOCK(inp);
1328                                                 inp->inp_flags2 |=
1329                                                     INP_2PCP_SET;
1330                                                 inp->inp_flags2 &=
1331                                                     ~INP_2PCP_MASK;
1332                                                 inp->inp_flags2 |=
1333                                                     optval << INP_2PCP_SHIFT;
1334                                                 INP_WUNLOCK(inp);
1335                                         }
1336                                 } else
1337                                         error = EINVAL;
1338                                 break;
1339                         }
1340                         break;
1341 #undef OPTSET
1342 #undef OPTSET2
1343
1344                 /*
1345                  * Multicast socket options are processed by the in_mcast
1346                  * module.
1347                  */
1348                 case IP_MULTICAST_IF:
1349                 case IP_MULTICAST_VIF:
1350                 case IP_MULTICAST_TTL:
1351                 case IP_MULTICAST_LOOP:
1352                 case IP_ADD_MEMBERSHIP:
1353                 case IP_DROP_MEMBERSHIP:
1354                 case IP_ADD_SOURCE_MEMBERSHIP:
1355                 case IP_DROP_SOURCE_MEMBERSHIP:
1356                 case IP_BLOCK_SOURCE:
1357                 case IP_UNBLOCK_SOURCE:
1358                 case IP_MSFILTER:
1359                 case MCAST_JOIN_GROUP:
1360                 case MCAST_LEAVE_GROUP:
1361                 case MCAST_JOIN_SOURCE_GROUP:
1362                 case MCAST_LEAVE_SOURCE_GROUP:
1363                 case MCAST_BLOCK_SOURCE:
1364                 case MCAST_UNBLOCK_SOURCE:
1365                         error = inp_setmoptions(inp, sopt);
1366                         break;
1367
1368                 case IP_PORTRANGE:
1369                         error = sooptcopyin(sopt, &optval, sizeof optval,
1370                                             sizeof optval);
1371                         if (error)
1372                                 break;
1373
1374                         INP_WLOCK(inp);
1375                         switch (optval) {
1376                         case IP_PORTRANGE_DEFAULT:
1377                                 inp->inp_flags &= ~(INP_LOWPORT);
1378                                 inp->inp_flags &= ~(INP_HIGHPORT);
1379                                 break;
1380
1381                         case IP_PORTRANGE_HIGH:
1382                                 inp->inp_flags &= ~(INP_LOWPORT);
1383                                 inp->inp_flags |= INP_HIGHPORT;
1384                                 break;
1385
1386                         case IP_PORTRANGE_LOW:
1387                                 inp->inp_flags &= ~(INP_HIGHPORT);
1388                                 inp->inp_flags |= INP_LOWPORT;
1389                                 break;
1390
1391                         default:
1392                                 error = EINVAL;
1393                                 break;
1394                         }
1395                         INP_WUNLOCK(inp);
1396                         break;
1397
1398 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1399                 case IP_IPSEC_POLICY:
1400                         if (IPSEC_ENABLED(ipv4)) {
1401                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1402                                 break;
1403                         }
1404                         /* FALLTHROUGH */
1405 #endif /* IPSEC */
1406
1407                 default:
1408                         error = ENOPROTOOPT;
1409                         break;
1410                 }
1411                 break;
1412
1413         case SOPT_GET:
1414                 switch (sopt->sopt_name) {
1415                 case IP_OPTIONS:
1416                 case IP_RETOPTS:
1417                         INP_RLOCK(inp);
1418                         if (inp->inp_options) {
1419                                 struct mbuf *options;
1420
1421                                 options = m_copym(inp->inp_options, 0,
1422                                     M_COPYALL, M_NOWAIT);
1423                                 INP_RUNLOCK(inp);
1424                                 if (options != NULL) {
1425                                         error = sooptcopyout(sopt,
1426                                                              mtod(options, char *),
1427                                                              options->m_len);
1428                                         m_freem(options);
1429                                 } else
1430                                         error = ENOMEM;
1431                         } else {
1432                                 INP_RUNLOCK(inp);
1433                                 sopt->sopt_valsize = 0;
1434                         }
1435                         break;
1436
1437                 case IP_TOS:
1438                 case IP_TTL:
1439                 case IP_MINTTL:
1440                 case IP_RECVOPTS:
1441                 case IP_RECVRETOPTS:
1442                 case IP_ORIGDSTADDR:
1443                 case IP_RECVDSTADDR:
1444                 case IP_RECVTTL:
1445                 case IP_RECVIF:
1446                 case IP_PORTRANGE:
1447                 case IP_ONESBCAST:
1448                 case IP_DONTFRAG:
1449                 case IP_BINDANY:
1450                 case IP_RECVTOS:
1451                 case IP_BINDMULTI:
1452                 case IP_FLOWID:
1453                 case IP_FLOWTYPE:
1454                 case IP_RECVFLOWID:
1455 #ifdef  RSS
1456                 case IP_RSSBUCKETID:
1457                 case IP_RECVRSSBUCKETID:
1458 #endif
1459                 case IP_VLAN_PCP:
1460                         switch (sopt->sopt_name) {
1461                         case IP_TOS:
1462                                 optval = inp->inp_ip_tos;
1463                                 break;
1464
1465                         case IP_TTL:
1466                                 optval = inp->inp_ip_ttl;
1467                                 break;
1468
1469                         case IP_MINTTL:
1470                                 optval = inp->inp_ip_minttl;
1471                                 break;
1472
1473 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
1474 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
1475
1476                         case IP_RECVOPTS:
1477                                 optval = OPTBIT(INP_RECVOPTS);
1478                                 break;
1479
1480                         case IP_RECVRETOPTS:
1481                                 optval = OPTBIT(INP_RECVRETOPTS);
1482                                 break;
1483
1484                         case IP_RECVDSTADDR:
1485                                 optval = OPTBIT(INP_RECVDSTADDR);
1486                                 break;
1487
1488                         case IP_ORIGDSTADDR:
1489                                 optval = OPTBIT2(INP_ORIGDSTADDR);
1490                                 break;
1491
1492                         case IP_RECVTTL:
1493                                 optval = OPTBIT(INP_RECVTTL);
1494                                 break;
1495
1496                         case IP_RECVIF:
1497                                 optval = OPTBIT(INP_RECVIF);
1498                                 break;
1499
1500                         case IP_PORTRANGE:
1501                                 if (inp->inp_flags & INP_HIGHPORT)
1502                                         optval = IP_PORTRANGE_HIGH;
1503                                 else if (inp->inp_flags & INP_LOWPORT)
1504                                         optval = IP_PORTRANGE_LOW;
1505                                 else
1506                                         optval = 0;
1507                                 break;
1508
1509                         case IP_ONESBCAST:
1510                                 optval = OPTBIT(INP_ONESBCAST);
1511                                 break;
1512                         case IP_DONTFRAG:
1513                                 optval = OPTBIT(INP_DONTFRAG);
1514                                 break;
1515                         case IP_BINDANY:
1516                                 optval = OPTBIT(INP_BINDANY);
1517                                 break;
1518                         case IP_RECVTOS:
1519                                 optval = OPTBIT(INP_RECVTOS);
1520                                 break;
1521                         case IP_FLOWID:
1522                                 optval = inp->inp_flowid;
1523                                 break;
1524                         case IP_FLOWTYPE:
1525                                 optval = inp->inp_flowtype;
1526                                 break;
1527                         case IP_RECVFLOWID:
1528                                 optval = OPTBIT2(INP_RECVFLOWID);
1529                                 break;
1530 #ifdef  RSS
1531                         case IP_RSSBUCKETID:
1532                                 retval = rss_hash2bucket(inp->inp_flowid,
1533                                     inp->inp_flowtype,
1534                                     &rss_bucket);
1535                                 if (retval == 0)
1536                                         optval = rss_bucket;
1537                                 else
1538                                         error = EINVAL;
1539                                 break;
1540                         case IP_RECVRSSBUCKETID:
1541                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1542                                 break;
1543 #endif
1544                         case IP_BINDMULTI:
1545                                 optval = OPTBIT2(INP_BINDMULTI);
1546                                 break;
1547                         case IP_VLAN_PCP:
1548                                 if (OPTBIT2(INP_2PCP_SET)) {
1549                                         optval = (inp->inp_flags2 &
1550                                             INP_2PCP_MASK) >> INP_2PCP_SHIFT;
1551                                 } else {
1552                                         optval = -1;
1553                                 }
1554                                 break;
1555                         }
1556                         error = sooptcopyout(sopt, &optval, sizeof optval);
1557                         break;
1558
1559                 /*
1560                  * Multicast socket options are processed by the in_mcast
1561                  * module.
1562                  */
1563                 case IP_MULTICAST_IF:
1564                 case IP_MULTICAST_VIF:
1565                 case IP_MULTICAST_TTL:
1566                 case IP_MULTICAST_LOOP:
1567                 case IP_MSFILTER:
1568                         error = inp_getmoptions(inp, sopt);
1569                         break;
1570
1571 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1572                 case IP_IPSEC_POLICY:
1573                         if (IPSEC_ENABLED(ipv4)) {
1574                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1575                                 break;
1576                         }
1577                         /* FALLTHROUGH */
1578 #endif /* IPSEC */
1579
1580                 default:
1581                         error = ENOPROTOOPT;
1582                         break;
1583                 }
1584                 break;
1585         }
1586         return (error);
1587 }
1588
1589 /*
1590  * Routine called from ip_output() to loop back a copy of an IP multicast
1591  * packet to the input queue of a specified interface.  Note that this
1592  * calls the output routine of the loopback "driver", but with an interface
1593  * pointer that might NOT be a loopback interface -- evil, but easier than
1594  * replicating that code here.
1595  */
1596 static void
1597 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1598 {
1599         struct ip *ip;
1600         struct mbuf *copym;
1601
1602         /*
1603          * Make a deep copy of the packet because we're going to
1604          * modify the pack in order to generate checksums.
1605          */
1606         copym = m_dup(m, M_NOWAIT);
1607         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1608                 copym = m_pullup(copym, hlen);
1609         if (copym != NULL) {
1610                 /* If needed, compute the checksum and mark it as valid. */
1611                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1612                         in_delayed_cksum(copym);
1613                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1614                         copym->m_pkthdr.csum_flags |=
1615                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1616                         copym->m_pkthdr.csum_data = 0xffff;
1617                 }
1618                 /*
1619                  * We don't bother to fragment if the IP length is greater
1620                  * than the interface's MTU.  Can this possibly matter?
1621                  */
1622                 ip = mtod(copym, struct ip *);
1623                 ip->ip_sum = 0;
1624                 ip->ip_sum = in_cksum(copym, hlen);
1625                 if_simloop(ifp, copym, AF_INET, 0);
1626         }
1627 }