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
  87 #include <netinet/udp.h>
  88 #include <netinet/udp_var.h>
  89
  90 #if defined(SCTP) || defined(SCTP_SUPPORT)
  91 #include <netinet/sctp.h>
  92 #include <netinet/sctp_crc32.h>
  93 #endif
  94
  95 #include <netipsec/ipsec_support.h>
  96
  97 #include <machine/in_cksum.h>
  98
  99 #include <security/mac/mac_framework.h>
 100
 101 #ifdef MBUF_STRESS_TEST
 102 static int mbuf_frag_size = 0;
 103 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
 104         &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
 105 #endif
 106
 107 static void     ip_mloopback(struct ifnet *, const struct mbuf *, int);
 108
 109 extern int in_mcast_loop;
 110 extern  struct protosw inetsw[];
 111
 112 static inline int
 113 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags,
 114     struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error)
 115 {
 116         struct m_tag *fwd_tag = NULL;
 117         struct mbuf *m;
 118         struct in_addr odst;
 119         struct ip *ip;
 120         int pflags = PFIL_OUT;
 121
 122         if (flags & IP_FORWARDING)
 123                 pflags |= PFIL_FWD;
 124
 125         m = *mp;
 126         ip = mtod(m, struct ip *);
 127
 128         /* Run through list of hooks for output packets. */
 129         odst.s_addr = ip->ip_dst.s_addr;
 130         switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, pflags, inp)) {
 131         case PFIL_DROPPED:
 132                 *error = EACCES;
 133                 /* FALLTHROUGH */
 134         case PFIL_CONSUMED:
 135                 return 1; /* Finished */
 136         case PFIL_PASS:
 137                 *error = 0;
 138         }
 139         m = *mp;
 140         ip = mtod(m, struct ip *);
 141
 142         /* See if destination IP address was changed by packet filter. */
 143         if (odst.s_addr != ip->ip_dst.s_addr) {
 144                 m->m_flags |= M_SKIP_FIREWALL;
 145                 /* If destination is now ourself drop to ip_input(). */
 146                 if (in_localip(ip->ip_dst)) {
 147                         m->m_flags |= M_FASTFWD_OURS;
 148                         if (m->m_pkthdr.rcvif == NULL)
 149                                 m->m_pkthdr.rcvif = V_loif;
 150                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 151                                 m->m_pkthdr.csum_flags |=
 152                                         CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 153                                 m->m_pkthdr.csum_data = 0xffff;
 154                         }
 155                         m->m_pkthdr.csum_flags |=
 156                                 CSUM_IP_CHECKED | CSUM_IP_VALID;
 157 #if defined(SCTP) || defined(SCTP_SUPPORT)
 158                         if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 159                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 160 #endif
 161                         *error = netisr_queue(NETISR_IP, m);
 162                         return 1; /* Finished */
 163                 }
 164
 165                 bzero(dst, sizeof(*dst));
 166                 dst->sin_family = AF_INET;
 167                 dst->sin_len = sizeof(*dst);
 168                 dst->sin_addr = ip->ip_dst;
 169
 170                 return -1; /* Reloop */
 171         }
 172         /* See if fib was changed by packet filter. */
 173         if ((*fibnum) != M_GETFIB(m)) {
 174                 m->m_flags |= M_SKIP_FIREWALL;
 175                 *fibnum = M_GETFIB(m);
 176                 return -1; /* Reloop for FIB change */
 177         }
 178
 179         /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
 180         if (m->m_flags & M_FASTFWD_OURS) {
 181                 if (m->m_pkthdr.rcvif == NULL)
 182                         m->m_pkthdr.rcvif = V_loif;
 183                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 184                         m->m_pkthdr.csum_flags |=
 185                                 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 186                         m->m_pkthdr.csum_data = 0xffff;
 187                 }
 188 #if defined(SCTP) || defined(SCTP_SUPPORT)
 189                 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 190                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 191 #endif
 192                 m->m_pkthdr.csum_flags |=
 193                         CSUM_IP_CHECKED | CSUM_IP_VALID;
 194
 195                 *error = netisr_queue(NETISR_IP, m);
 196                 return 1; /* Finished */
 197         }
 198         /* Or forward to some other address? */
 199         if ((m->m_flags & M_IP_NEXTHOP) &&
 200             ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
 201                 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
 202                 m->m_flags |= M_SKIP_FIREWALL;
 203                 m->m_flags &= ~M_IP_NEXTHOP;
 204                 m_tag_delete(m, fwd_tag);
 205
 206                 return -1; /* Reloop for CHANGE of dst */
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int
 213 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m,
 214     const struct sockaddr_in *gw, struct route *ro, bool stamp_tag)
 215 {
 216 #ifdef KERN_TLS
 217         struct ktls_session *tls = NULL;
 218 #endif
 219         struct m_snd_tag *mst;
 220         int error;
 221
 222         MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
 223         mst = NULL;
 224
 225 #ifdef KERN_TLS
 226         /*
 227          * If this is an unencrypted TLS record, save a reference to
 228          * the record.  This local reference is used to call
 229          * ktls_output_eagain after the mbuf has been freed (thus
 230          * dropping the mbuf's reference) in if_output.
 231          */
 232         if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
 233                 tls = ktls_hold(m->m_next->m_epg_tls);
 234                 mst = tls->snd_tag;
 235
 236                 /*
 237                  * If a TLS session doesn't have a valid tag, it must
 238                  * have had an earlier ifp mismatch, so drop this
 239                  * packet.
 240                  */
 241                 if (mst == NULL) {
 242                         error = EAGAIN;
 243                         goto done;
 244                 }
 245                 /*
 246                  * Always stamp tags that include NIC ktls.
 247                  */
 248                 stamp_tag = true;
 249         }
 250 #endif
 251 #ifdef RATELIMIT
 252         if (inp != NULL && mst == NULL) {
 253                 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
 254                     (inp->inp_snd_tag != NULL &&
 255                     inp->inp_snd_tag->ifp != ifp))
 256                         in_pcboutput_txrtlmt(inp, ifp, m);
 257
 258                 if (inp->inp_snd_tag != NULL)
 259                         mst = inp->inp_snd_tag;
 260         }
 261 #endif
 262         if (stamp_tag && mst != NULL) {
 263                 KASSERT(m->m_pkthdr.rcvif == NULL,
 264                     ("trying to add a send tag to a forwarded packet"));
 265                 if (mst->ifp != ifp) {
 266                         error = EAGAIN;
 267                         goto done;
 268                 }
 269
 270                 /* stamp send tag on mbuf */
 271                 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
 272                 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
 273         }
 274
 275         error = (*ifp->if_output)(ifp, m, (const struct sockaddr *)gw, ro);
 276
 277 done:
 278         /* Check for route change invalidating send tags. */
 279 #ifdef KERN_TLS
 280         if (tls != NULL) {
 281                 if (error == EAGAIN)
 282                         error = ktls_output_eagain(inp, tls);
 283                 ktls_free(tls);
 284         }
 285 #endif
 286 #ifdef RATELIMIT
 287         if (error == EAGAIN)
 288                 in_pcboutput_eagain(inp);
 289 #endif
 290         return (error);
 291 }
 292
 293 /* rte<>ro_flags translation */
 294 static inline void
 295 rt_update_ro_flags(struct route *ro)
 296 {
 297         int nh_flags = ro->ro_nh->nh_flags;
 298
 299         ro->ro_flags &= ~ (RT_REJECT|RT_BLACKHOLE|RT_HAS_GW);
 300
 301         ro->ro_flags |= (nh_flags & NHF_REJECT) ? RT_REJECT : 0;
 302         ro->ro_flags |= (nh_flags & NHF_BLACKHOLE) ? RT_BLACKHOLE : 0;
 303         ro->ro_flags |= (nh_flags & NHF_GATEWAY) ? RT_HAS_GW : 0;
 304 }
 305
 306 /*
 307  * IP output.  The packet in mbuf chain m contains a skeletal IP
 308  * header (with len, off, ttl, proto, tos, src, dst).
 309  * The mbuf chain containing the packet will be freed.
 310  * The mbuf opt, if present, will not be freed.
 311  * If route ro is present and has ro_rt initialized, route lookup would be
 312  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 313  * then result of route lookup is stored in ro->ro_rt.
 314  *
 315  * In the IP forwarding case, the packet will arrive with options already
 316  * inserted, so must have a NULL opt pointer.
 317  */
 318 int
 319 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 320     struct ip_moptions *imo, struct inpcb *inp)
 321 {
 322         struct rm_priotracker in_ifa_tracker;
 323         struct ip *ip;
 324         struct ifnet *ifp = NULL;       /* keep compiler happy */
 325         struct mbuf *m0;
 326         int hlen = sizeof (struct ip);
 327         int mtu = 0;
 328         int error = 0;
 329         int vlan_pcp = -1;
 330         struct sockaddr_in *dst, sin;
 331         const struct sockaddr_in *gw;
 332         struct in_ifaddr *ia = NULL;
 333         struct in_addr src;
 334         int isbroadcast;
 335         uint16_t ip_len, ip_off;
 336         uint32_t fibnum;
 337 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 338         int no_route_but_check_spd = 0;
 339 #endif
 340
 341         M_ASSERTPKTHDR(m);
 342         NET_EPOCH_ASSERT();
 343
 344         if (inp != NULL) {
 345                 INP_LOCK_ASSERT(inp);
 346                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 347                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 348                         m->m_pkthdr.flowid = inp->inp_flowid;
 349                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 350                 }
 351                 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
 352                         vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
 353                             INP_2PCP_SHIFT;
 354 #ifdef NUMA
 355                 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
 356 #endif
 357         }
 358
 359         if (opt) {
 360                 int len = 0;
 361                 m = ip_insertoptions(m, opt, &len);
 362                 if (len != 0)
 363                         hlen = len; /* ip->ip_hl is updated above */
 364         }
 365         ip = mtod(m, struct ip *);
 366         ip_len = ntohs(ip->ip_len);
 367         ip_off = ntohs(ip->ip_off);
 368
 369         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
 370                 ip->ip_v = IPVERSION;
 371                 ip->ip_hl = hlen >> 2;
 372                 ip_fillid(ip);
 373         } else {
 374                 /* Header already set, fetch hlen from there */
 375                 hlen = ip->ip_hl << 2;
 376         }
 377         if ((flags & IP_FORWARDING) == 0)
 378                 IPSTAT_INC(ips_localout);
 379
 380         /*
 381          * dst/gw handling:
 382          *
 383          * gw is readonly but can point either to dst OR rt_gateway,
 384          * therefore we need restore gw if we're redoing lookup.
 385          */
 386         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 387         if (ro != NULL)
 388                 dst = (struct sockaddr_in *)&ro->ro_dst;
 389         else
 390                 dst = &sin;
 391         if (ro == NULL || ro->ro_nh == NULL) {
 392                 bzero(dst, sizeof(*dst));
 393                 dst->sin_family = AF_INET;
 394                 dst->sin_len = sizeof(*dst);
 395                 dst->sin_addr = ip->ip_dst;
 396         }
 397         gw = dst;
 398 again:
 399         /*
 400          * Validate route against routing table additions;
 401          * a better/more specific route might have been added.
 402          */
 403         if (inp != NULL && ro != NULL && ro->ro_nh != NULL)
 404                 NH_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
 405         /*
 406          * If there is a cached route,
 407          * check that it is to the same destination
 408          * and is still up.  If not, free it and try again.
 409          * The address family should also be checked in case of sharing the
 410          * cache with IPv6.
 411          * Also check whether routing cache needs invalidation.
 412          */
 413         if (ro != NULL && ro->ro_nh != NULL &&
 414             ((!NH_IS_VALID(ro->ro_nh)) || dst->sin_family != AF_INET ||
 415             dst->sin_addr.s_addr != ip->ip_dst.s_addr))
 416                 RO_INVALIDATE_CACHE(ro);
 417         ia = NULL;
 418         /*
 419          * If routing to interface only, short circuit routing lookup.
 420          * The use of an all-ones broadcast address implies this; an
 421          * interface is specified by the broadcast address of an interface,
 422          * or the destination address of a ptp interface.
 423          */
 424         if (flags & IP_SENDONES) {
 425                 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
 426                                                       M_GETFIB(m)))) == NULL &&
 427                     (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 428                                                     M_GETFIB(m)))) == NULL) {
 429                         IPSTAT_INC(ips_noroute);
 430                         error = ENETUNREACH;
 431                         goto bad;
 432                 }
 433                 ip->ip_dst.s_addr = INADDR_BROADCAST;
 434                 dst->sin_addr = ip->ip_dst;
 435                 ifp = ia->ia_ifp;
 436                 mtu = ifp->if_mtu;
 437                 ip->ip_ttl = 1;
 438                 isbroadcast = 1;
 439                 src = IA_SIN(ia)->sin_addr;
 440         } else if (flags & IP_ROUTETOIF) {
 441                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 442                                                     M_GETFIB(m)))) == NULL &&
 443                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
 444                                                 M_GETFIB(m)))) == NULL) {
 445                         IPSTAT_INC(ips_noroute);
 446                         error = ENETUNREACH;
 447                         goto bad;
 448                 }
 449                 ifp = ia->ia_ifp;
 450                 mtu = ifp->if_mtu;
 451                 ip->ip_ttl = 1;
 452                 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
 453                     in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
 454                 src = IA_SIN(ia)->sin_addr;
 455         } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
 456             imo != NULL && imo->imo_multicast_ifp != NULL) {
 457                 /*
 458                  * Bypass the normal routing lookup for multicast
 459                  * packets if the interface is specified.
 460                  */
 461                 ifp = imo->imo_multicast_ifp;
 462                 mtu = ifp->if_mtu;
 463                 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
 464                 isbroadcast = 0;        /* fool gcc */
 465                 /* Interface may have no addresses. */
 466                 if (ia != NULL)
 467                         src = IA_SIN(ia)->sin_addr;
 468                 else
 469                         src.s_addr = INADDR_ANY;
 470         } else if (ro != NULL) {
 471                 if (ro->ro_nh == NULL) {
 472                         /*
 473                          * We want to do any cloning requested by the link
 474                          * layer, as this is probably required in all cases
 475                          * for correct operation (as it is for ARP).
 476                          */
 477                         uint32_t flowid;
 478                         flowid = m->m_pkthdr.flowid;
 479                         ro->ro_nh = fib4_lookup(fibnum, dst->sin_addr, 0,
 480                             NHR_REF, flowid);
 481
 482                         if (ro->ro_nh == NULL || (!NH_IS_VALID(ro->ro_nh))) {
 483 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 484                                 /*
 485                                  * There is no route for this packet, but it is
 486                                  * possible that a matching SPD entry exists.
 487                                  */
 488                                 no_route_but_check_spd = 1;
 489                                 goto sendit;
 490 #endif
 491                                 IPSTAT_INC(ips_noroute);
 492                                 error = EHOSTUNREACH;
 493                                 goto bad;
 494                         }
 495                 }
 496                 ia = ifatoia(ro->ro_nh->nh_ifa);
 497                 ifp = ro->ro_nh->nh_ifp;
 498                 counter_u64_add(ro->ro_nh->nh_pksent, 1);
 499                 rt_update_ro_flags(ro);
 500                 if (ro->ro_nh->nh_flags & NHF_GATEWAY)
 501                         gw = &ro->ro_nh->gw4_sa;
 502                 if (ro->ro_nh->nh_flags & NHF_HOST)
 503                         isbroadcast = (ro->ro_nh->nh_flags & NHF_BROADCAST);
 504                 else if (ifp->if_flags & IFF_BROADCAST)
 505                         isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
 506                 else
 507                         isbroadcast = 0;
 508                 if (ro->ro_nh->nh_flags & NHF_HOST)
 509                         mtu = ro->ro_nh->nh_mtu;
 510                 else
 511                         mtu = ifp->if_mtu;
 512                 src = IA_SIN(ia)->sin_addr;
 513         } else {
 514                 struct nhop_object *nh;
 515
 516                 nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_NONE,
 517                     m->m_pkthdr.flowid);
 518                 if (nh == NULL) {
 519 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 520                         /*
 521                          * There is no route for this packet, but it is
 522                          * possible that a matching SPD entry exists.
 523                          */
 524                         no_route_but_check_spd = 1;
 525                         goto sendit;
 526 #endif
 527                         IPSTAT_INC(ips_noroute);
 528                         error = EHOSTUNREACH;
 529                         goto bad;
 530                 }
 531                 ifp = nh->nh_ifp;
 532                 mtu = nh->nh_mtu;
 533                 /*
 534                  * We are rewriting here dst to be gw actually, contradicting
 535                  * comment at the beginning of the function. However, in this
 536                  * case we are always dealing with on stack dst.
 537                  * In case if pfil(9) sends us back to beginning of the
 538                  * function, the dst would be rewritten by ip_output_pfil().
 539                  */
 540                 MPASS(dst == &sin);
 541                 if (nh->nh_flags & NHF_GATEWAY)
 542                         dst->sin_addr = nh->gw4_sa.sin_addr;
 543                 ia = ifatoia(nh->nh_ifa);
 544                 src = IA_SIN(ia)->sin_addr;
 545                 isbroadcast = (((nh->nh_flags & (NHF_HOST | NHF_BROADCAST)) ==
 546                     (NHF_HOST | NHF_BROADCAST)) ||
 547                     ((ifp->if_flags & IFF_BROADCAST) &&
 548                     in_ifaddr_broadcast(dst->sin_addr, ia)));
 549         }
 550
 551         /* Catch a possible divide by zero later. */
 552         KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (nh_flags=0x%08x) ifp=%p",
 553             __func__, mtu, ro,
 554             (ro != NULL && ro->ro_nh != NULL) ? ro->ro_nh->nh_flags : 0, ifp));
 555
 556         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 557                 m->m_flags |= M_MCAST;
 558                 /*
 559                  * IP destination address is multicast.  Make sure "gw"
 560                  * still points to the address in "ro".  (It may have been
 561                  * changed to point to a gateway address, above.)
 562                  */
 563                 gw = dst;
 564                 /*
 565                  * See if the caller provided any multicast options
 566                  */
 567                 if (imo != NULL) {
 568                         ip->ip_ttl = imo->imo_multicast_ttl;
 569                         if (imo->imo_multicast_vif != -1)
 570                                 ip->ip_src.s_addr =
 571                                     ip_mcast_src ?
 572                                     ip_mcast_src(imo->imo_multicast_vif) :
 573                                     INADDR_ANY;
 574                 } else
 575                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
 576                 /*
 577                  * Confirm that the outgoing interface supports multicast.
 578                  */
 579                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
 580                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
 581                                 IPSTAT_INC(ips_noroute);
 582                                 error = ENETUNREACH;
 583                                 goto bad;
 584                         }
 585                 }
 586                 /*
 587                  * If source address not specified yet, use address
 588                  * of outgoing interface.
 589                  */
 590                 if (ip->ip_src.s_addr == INADDR_ANY)
 591                         ip->ip_src = src;
 592
 593                 if ((imo == NULL && in_mcast_loop) ||
 594                     (imo && imo->imo_multicast_loop)) {
 595                         /*
 596                          * Loop back multicast datagram if not expressly
 597                          * forbidden to do so, even if we are not a member
 598                          * of the group; ip_input() will filter it later,
 599                          * thus deferring a hash lookup and mutex acquisition
 600                          * at the expense of a cheap copy using m_copym().
 601                          */
 602                         ip_mloopback(ifp, m, hlen);
 603                 } else {
 604                         /*
 605                          * If we are acting as a multicast router, perform
 606                          * multicast forwarding as if the packet had just
 607                          * arrived on the interface to which we are about
 608                          * to send.  The multicast forwarding function
 609                          * recursively calls this function, using the
 610                          * IP_FORWARDING flag to prevent infinite recursion.
 611                          *
 612                          * Multicasts that are looped back by ip_mloopback(),
 613                          * above, will be forwarded by the ip_input() routine,
 614                          * if necessary.
 615                          */
 616                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
 617                                 /*
 618                                  * If rsvp daemon is not running, do not
 619                                  * set ip_moptions. This ensures that the packet
 620                                  * is multicast and not just sent down one link
 621                                  * as prescribed by rsvpd.
 622                                  */
 623                                 if (!V_rsvp_on)
 624                                         imo = NULL;
 625                                 if (ip_mforward &&
 626                                     ip_mforward(ip, ifp, m, imo) != 0) {
 627                                         m_freem(m);
 628                                         goto done;
 629                                 }
 630                         }
 631                 }
 632
 633                 /*
 634                  * Multicasts with a time-to-live of zero may be looped-
 635                  * back, above, but must not be transmitted on a network.
 636                  * Also, multicasts addressed to the loopback interface
 637                  * are not sent -- the above call to ip_mloopback() will
 638                  * loop back a copy. ip_input() will drop the copy if
 639                  * this host does not belong to the destination group on
 640                  * the loopback interface.
 641                  */
 642                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
 643                         m_freem(m);
 644                         goto done;
 645                 }
 646
 647                 goto sendit;
 648         }
 649
 650         /*
 651          * If the source address is not specified yet, use the address
 652          * of the outoing interface.
 653          */
 654         if (ip->ip_src.s_addr == INADDR_ANY)
 655                 ip->ip_src = src;
 656
 657         /*
 658          * Look for broadcast address and
 659          * verify user is allowed to send
 660          * such a packet.
 661          */
 662         if (isbroadcast) {
 663                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 664                         error = EADDRNOTAVAIL;
 665                         goto bad;
 666                 }
 667                 if ((flags & IP_ALLOWBROADCAST) == 0) {
 668                         error = EACCES;
 669                         goto bad;
 670                 }
 671                 /* don't allow broadcast messages to be fragmented */
 672                 if (ip_len > mtu) {
 673                         error = EMSGSIZE;
 674                         goto bad;
 675                 }
 676                 m->m_flags |= M_BCAST;
 677         } else {
 678                 m->m_flags &= ~M_BCAST;
 679         }
 680
 681 sendit:
 682 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 683         if (IPSEC_ENABLED(ipv4)) {
 684                 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
 685                         if (error == EINPROGRESS)
 686                                 error = 0;
 687                         goto done;
 688                 }
 689         }
 690         /*
 691          * Check if there was a route for this packet; return error if not.
 692          */
 693         if (no_route_but_check_spd) {
 694                 IPSTAT_INC(ips_noroute);
 695                 error = EHOSTUNREACH;
 696                 goto bad;
 697         }
 698         /* Update variables that are affected by ipsec4_output(). */
 699         ip = mtod(m, struct ip *);
 700         hlen = ip->ip_hl << 2;
 701 #endif /* IPSEC */
 702
 703         /* Jump over all PFIL processing if hooks are not active. */
 704         if (PFIL_HOOKED_OUT(V_inet_pfil_head)) {
 705                 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum,
 706                     &error)) {
 707                 case 1: /* Finished */
 708                         goto done;
 709
 710                 case 0: /* Continue normally */
 711                         ip = mtod(m, struct ip *);
 712                         break;
 713
 714                 case -1: /* Need to try again */
 715                         /* Reset everything for a new round */
 716                         if (ro != NULL) {
 717                                 RO_NHFREE(ro);
 718                                 ro->ro_prepend = NULL;
 719                         }
 720                         gw = dst;
 721                         ip = mtod(m, struct ip *);
 722                         goto again;
 723                 }
 724         }
 725
 726         if (vlan_pcp > -1)
 727                 EVL_APPLY_PRI(m, vlan_pcp);
 728
 729         /* IN_LOOPBACK must not appear on the wire - RFC1122. */
 730         if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
 731             IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
 732                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
 733                         IPSTAT_INC(ips_badaddr);
 734                         error = EADDRNOTAVAIL;
 735                         goto bad;
 736                 }
 737         }
 738
 739         m->m_pkthdr.csum_flags |= CSUM_IP;
 740         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
 741                 m = mb_unmapped_to_ext(m);
 742                 if (m == NULL) {
 743                         IPSTAT_INC(ips_odropped);
 744                         error = ENOBUFS;
 745                         goto bad;
 746                 }
 747                 in_delayed_cksum(m);
 748                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 749         } else if ((ifp->if_capenable & IFCAP_NOMAP) == 0) {
 750                 m = mb_unmapped_to_ext(m);
 751                 if (m == NULL) {
 752                         IPSTAT_INC(ips_odropped);
 753                         error = ENOBUFS;
 754                         goto bad;
 755                 }
 756         }
 757 #if defined(SCTP) || defined(SCTP_SUPPORT)
 758         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
 759                 m = mb_unmapped_to_ext(m);
 760                 if (m == NULL) {
 761                         IPSTAT_INC(ips_odropped);
 762                         error = ENOBUFS;
 763                         goto bad;
 764                 }
 765                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
 766                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 767         }
 768 #endif
 769
 770         /*
 771          * If small enough for interface, or the interface will take
 772          * care of the fragmentation for us, we can just send directly.
 773          * Note that if_vxlan could have requested TSO even though the outer
 774          * frame is UDP.  It is correct to not fragment such datagrams and
 775          * instead just pass them on to the driver.
 776          */
 777         if (ip_len <= mtu ||
 778             (m->m_pkthdr.csum_flags & ifp->if_hwassist &
 779             (CSUM_TSO | CSUM_INNER_TSO)) != 0) {
 780                 ip->ip_sum = 0;
 781                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
 782                         ip->ip_sum = in_cksum(m, hlen);
 783                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 784                 }
 785
 786                 /*
 787                  * Record statistics for this interface address.
 788                  * With CSUM_TSO the byte/packet count will be slightly
 789                  * incorrect because we count the IP+TCP headers only
 790                  * once instead of for every generated packet.
 791                  */
 792                 if (!(flags & IP_FORWARDING) && ia) {
 793                         if (m->m_pkthdr.csum_flags &
 794                             (CSUM_TSO | CSUM_INNER_TSO))
 795                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
 796                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
 797                         else
 798                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 799
 800                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
 801                 }
 802 #ifdef MBUF_STRESS_TEST
 803                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
 804                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
 805 #endif
 806                 /*
 807                  * Reset layer specific mbuf flags
 808                  * to avoid confusing lower layers.
 809                  */
 810                 m_clrprotoflags(m);
 811                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
 812                 error = ip_output_send(inp, ifp, m, gw, ro,
 813                     (flags & IP_NO_SND_TAG_RL) ? false : true);
 814                 goto done;
 815         }
 816
 817         /* Balk when DF bit is set or the interface didn't support TSO. */
 818         if ((ip_off & IP_DF) ||
 819             (m->m_pkthdr.csum_flags & (CSUM_TSO | CSUM_INNER_TSO))) {
 820                 error = EMSGSIZE;
 821                 IPSTAT_INC(ips_cantfrag);
 822                 goto bad;
 823         }
 824
 825         /*
 826          * Too large for interface; fragment if possible. If successful,
 827          * on return, m will point to a list of packets to be sent.
 828          */
 829         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
 830         if (error)
 831                 goto bad;
 832         for (; m; m = m0) {
 833                 m0 = m->m_nextpkt;
 834                 m->m_nextpkt = 0;
 835                 if (error == 0) {
 836                         /* Record statistics for this interface address. */
 837                         if (ia != NULL) {
 838                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 839                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 840                                     m->m_pkthdr.len);
 841                         }
 842                         /*
 843                          * Reset layer specific mbuf flags
 844                          * to avoid confusing upper layers.
 845                          */
 846                         m_clrprotoflags(m);
 847
 848                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
 849                             mtod(m, struct ip *), NULL);
 850                         error = ip_output_send(inp, ifp, m, gw, ro, true);
 851                 } else
 852                         m_freem(m);
 853         }
 854
 855         if (error == 0)
 856                 IPSTAT_INC(ips_fragmented);
 857
 858 done:
 859         return (error);
 860  bad:
 861         m_freem(m);
 862         goto done;
 863 }
 864
 865 /*
 866  * Create a chain of fragments which fit the given mtu. m_frag points to the
 867  * mbuf to be fragmented; on return it points to the chain with the fragments.
 868  * Return 0 if no error. If error, m_frag may contain a partially built
 869  * chain of fragments that should be freed by the caller.
 870  *
 871  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
 872  */
 873 int
 874 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 875     u_long if_hwassist_flags)
 876 {
 877         int error = 0;
 878         int hlen = ip->ip_hl << 2;
 879         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
 880         int off;
 881         struct mbuf *m0 = *m_frag;      /* the original packet          */
 882         int firstlen;
 883         struct mbuf **mnext;
 884         int nfrags;
 885         uint16_t ip_len, ip_off;
 886
 887         ip_len = ntohs(ip->ip_len);
 888         ip_off = ntohs(ip->ip_off);
 889
 890         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
 891                 IPSTAT_INC(ips_cantfrag);
 892                 return EMSGSIZE;
 893         }
 894
 895         /*
 896          * Must be able to put at least 8 bytes per fragment.
 897          */
 898         if (len < 8)
 899                 return EMSGSIZE;
 900
 901         /*
 902          * If the interface will not calculate checksums on
 903          * fragmented packets, then do it here.
 904          */
 905         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 906                 m0 = mb_unmapped_to_ext(m0);
 907                 if (m0 == NULL) {
 908                         error = ENOBUFS;
 909                         IPSTAT_INC(ips_odropped);
 910                         goto done;
 911                 }
 912                 in_delayed_cksum(m0);
 913                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 914         }
 915 #if defined(SCTP) || defined(SCTP_SUPPORT)
 916         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
 917                 m0 = mb_unmapped_to_ext(m0);
 918                 if (m0 == NULL) {
 919                         error = ENOBUFS;
 920                         IPSTAT_INC(ips_odropped);
 921                         goto done;
 922                 }
 923                 sctp_delayed_cksum(m0, hlen);
 924                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 925         }
 926 #endif
 927         if (len > PAGE_SIZE) {
 928                 /*
 929                  * Fragment large datagrams such that each segment
 930                  * contains a multiple of PAGE_SIZE amount of data,
 931                  * plus headers. This enables a receiver to perform
 932                  * page-flipping zero-copy optimizations.
 933                  *
 934                  * XXX When does this help given that sender and receiver
 935                  * could have different page sizes, and also mtu could
 936                  * be less than the receiver's page size ?
 937                  */
 938                 int newlen;
 939
 940                 off = MIN(mtu, m0->m_pkthdr.len);
 941
 942                 /*
 943                  * firstlen (off - hlen) must be aligned on an
 944                  * 8-byte boundary
 945                  */
 946                 if (off < hlen)
 947                         goto smart_frag_failure;
 948                 off = ((off - hlen) & ~7) + hlen;
 949                 newlen = (~PAGE_MASK) & mtu;
 950                 if ((newlen + sizeof (struct ip)) > mtu) {
 951                         /* we failed, go back the default */
 952 smart_frag_failure:
 953                         newlen = len;
 954                         off = hlen + len;
 955                 }
 956                 len = newlen;
 957
 958         } else {
 959                 off = hlen + len;
 960         }
 961
 962         firstlen = off - hlen;
 963         mnext = &m0->m_nextpkt;         /* pointer to next packet */
 964
 965         /*
 966          * Loop through length of segment after first fragment,
 967          * make new header and copy data of each part and link onto chain.
 968          * Here, m0 is the original packet, m is the fragment being created.
 969          * The fragments are linked off the m_nextpkt of the original
 970          * packet, which after processing serves as the first fragment.
 971          */
 972         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
 973                 struct ip *mhip;        /* ip header on the fragment */
 974                 struct mbuf *m;
 975                 int mhlen = sizeof (struct ip);
 976
 977                 m = m_gethdr(M_NOWAIT, MT_DATA);
 978                 if (m == NULL) {
 979                         error = ENOBUFS;
 980                         IPSTAT_INC(ips_odropped);
 981                         goto done;
 982                 }
 983                 /*
 984                  * Make sure the complete packet header gets copied
 985                  * from the originating mbuf to the newly created
 986                  * mbuf. This also ensures that existing firewall
 987                  * classification(s), VLAN tags and so on get copied
 988                  * to the resulting fragmented packet(s):
 989                  */
 990                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 991                         m_free(m);
 992                         error = ENOBUFS;
 993                         IPSTAT_INC(ips_odropped);
 994                         goto done;
 995                 }
 996                 /*
 997                  * In the first mbuf, leave room for the link header, then
 998                  * copy the original IP header including options. The payload
 999                  * goes into an additional mbuf chain returned by m_copym().
1000                  */
1001                 m->m_data += max_linkhdr;
1002                 mhip = mtod(m, struct ip *);
1003                 *mhip = *ip;
1004                 if (hlen > sizeof (struct ip)) {
1005                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
1006                         mhip->ip_v = IPVERSION;
1007                         mhip->ip_hl = mhlen >> 2;
1008                 }
1009                 m->m_len = mhlen;
1010                 /* XXX do we need to add ip_off below ? */
1011                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
1012                 if (off + len >= ip_len)
1013                         len = ip_len - off;
1014                 else
1015                         mhip->ip_off |= IP_MF;
1016                 mhip->ip_len = htons((u_short)(len + mhlen));
1017                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
1018                 if (m->m_next == NULL) {        /* copy failed */
1019                         m_free(m);
1020                         error = ENOBUFS;        /* ??? */
1021                         IPSTAT_INC(ips_odropped);
1022                         goto done;
1023                 }
1024                 m->m_pkthdr.len = mhlen + len;
1025 #ifdef MAC
1026                 mac_netinet_fragment(m0, m);
1027 #endif
1028                 mhip->ip_off = htons(mhip->ip_off);
1029                 mhip->ip_sum = 0;
1030                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1031                         mhip->ip_sum = in_cksum(m, mhlen);
1032                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
1033                 }
1034                 *mnext = m;
1035                 mnext = &m->m_nextpkt;
1036         }
1037         IPSTAT_ADD(ips_ofragments, nfrags);
1038
1039         /*
1040          * Update first fragment by trimming what's been copied out
1041          * and updating header.
1042          */
1043         m_adj(m0, hlen + firstlen - ip_len);
1044         m0->m_pkthdr.len = hlen + firstlen;
1045         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
1046         ip->ip_off = htons(ip_off | IP_MF);
1047         ip->ip_sum = 0;
1048         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1049                 ip->ip_sum = in_cksum(m0, hlen);
1050                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
1051         }
1052
1053 done:
1054         *m_frag = m0;
1055         return error;
1056 }
1057
1058 void
1059 in_delayed_cksum(struct mbuf *m)
1060 {
1061         struct ip *ip;
1062         struct udphdr *uh;
1063         uint16_t cklen, csum, offset;
1064
1065         ip = mtod(m, struct ip *);
1066         offset = ip->ip_hl << 2 ;
1067
1068         if (m->m_pkthdr.csum_flags & CSUM_UDP) {
1069                 /* if udp header is not in the first mbuf copy udplen */
1070                 if (offset + sizeof(struct udphdr) > m->m_len) {
1071                         m_copydata(m, offset + offsetof(struct udphdr,
1072                             uh_ulen), sizeof(cklen), (caddr_t)&cklen);
1073                         cklen = ntohs(cklen);
1074                 } else {
1075                         uh = (struct udphdr *)mtodo(m, offset);
1076                         cklen = ntohs(uh->uh_ulen);
1077                 }
1078                 csum = in_cksum_skip(m, cklen + offset, offset);
1079                 if (csum == 0)
1080                         csum = 0xffff;
1081         } else {
1082                 cklen = ntohs(ip->ip_len);
1083                 csum = in_cksum_skip(m, cklen, offset);
1084         }
1085         offset += m->m_pkthdr.csum_data;        /* checksum offset */
1086
1087         if (offset + sizeof(csum) > m->m_len)
1088                 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
1089         else
1090                 *(u_short *)mtodo(m, offset) = csum;
1091 }
1092
1093 /*
1094  * IP socket option processing.
1095  */
1096 int
1097 ip_ctloutput(struct socket *so, struct sockopt *sopt)
1098 {
1099         struct inpcb *inp = sotoinpcb(so);
1100         int     error, optval;
1101 #ifdef  RSS
1102         uint32_t rss_bucket;
1103         int retval;
1104 #endif
1105
1106         error = optval = 0;
1107         if (sopt->sopt_level != IPPROTO_IP) {
1108                 error = EINVAL;
1109
1110                 if (sopt->sopt_level == SOL_SOCKET &&
1111                     sopt->sopt_dir == SOPT_SET) {
1112                         switch (sopt->sopt_name) {
1113                         case SO_REUSEADDR:
1114                                 INP_WLOCK(inp);
1115                                 if ((so->so_options & SO_REUSEADDR) != 0)
1116                                         inp->inp_flags2 |= INP_REUSEADDR;
1117                                 else
1118                                         inp->inp_flags2 &= ~INP_REUSEADDR;
1119                                 INP_WUNLOCK(inp);
1120                                 error = 0;
1121                                 break;
1122                         case SO_REUSEPORT:
1123                                 INP_WLOCK(inp);
1124                                 if ((so->so_options & SO_REUSEPORT) != 0)
1125                                         inp->inp_flags2 |= INP_REUSEPORT;
1126                                 else
1127                                         inp->inp_flags2 &= ~INP_REUSEPORT;
1128                                 INP_WUNLOCK(inp);
1129                                 error = 0;
1130                                 break;
1131                         case SO_REUSEPORT_LB:
1132                                 INP_WLOCK(inp);
1133                                 if ((so->so_options & SO_REUSEPORT_LB) != 0)
1134                                         inp->inp_flags2 |= INP_REUSEPORT_LB;
1135                                 else
1136                                         inp->inp_flags2 &= ~INP_REUSEPORT_LB;
1137                                 INP_WUNLOCK(inp);
1138                                 error = 0;
1139                                 break;
1140                         case SO_SETFIB:
1141                                 INP_WLOCK(inp);
1142                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
1143                                 INP_WUNLOCK(inp);
1144                                 error = 0;
1145                                 break;
1146                         case SO_MAX_PACING_RATE:
1147 #ifdef RATELIMIT
1148                                 INP_WLOCK(inp);
1149                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1150                                 INP_WUNLOCK(inp);
1151                                 error = 0;
1152 #else
1153                                 error = EOPNOTSUPP;
1154 #endif
1155                                 break;
1156                         default:
1157                                 break;
1158                         }
1159                 }
1160                 return (error);
1161         }
1162
1163         switch (sopt->sopt_dir) {
1164         case SOPT_SET:
1165                 switch (sopt->sopt_name) {
1166                 case IP_OPTIONS:
1167 #ifdef notyet
1168                 case IP_RETOPTS:
1169 #endif
1170                 {
1171                         struct mbuf *m;
1172                         if (sopt->sopt_valsize > MLEN) {
1173                                 error = EMSGSIZE;
1174                                 break;
1175                         }
1176                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1177                         if (m == NULL) {
1178                                 error = ENOBUFS;
1179                                 break;
1180                         }
1181                         m->m_len = sopt->sopt_valsize;
1182                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1183                                             m->m_len);
1184                         if (error) {
1185                                 m_free(m);
1186                                 break;
1187                         }
1188                         INP_WLOCK(inp);
1189                         error = ip_pcbopts(inp, sopt->sopt_name, m);
1190                         INP_WUNLOCK(inp);
1191                         return (error);
1192                 }
1193
1194                 case IP_BINDANY:
1195                         if (sopt->sopt_td != NULL) {
1196                                 error = priv_check(sopt->sopt_td,
1197                                     PRIV_NETINET_BINDANY);
1198                                 if (error)
1199                                         break;
1200                         }
1201                         /* FALLTHROUGH */
1202                 case IP_BINDMULTI:
1203 #ifdef  RSS
1204                 case IP_RSS_LISTEN_BUCKET:
1205 #endif
1206                 case IP_TOS:
1207                 case IP_TTL:
1208                 case IP_MINTTL:
1209                 case IP_RECVOPTS:
1210                 case IP_RECVRETOPTS:
1211                 case IP_ORIGDSTADDR:
1212                 case IP_RECVDSTADDR:
1213                 case IP_RECVTTL:
1214                 case IP_RECVIF:
1215                 case IP_ONESBCAST:
1216                 case IP_DONTFRAG:
1217                 case IP_RECVTOS:
1218                 case IP_RECVFLOWID:
1219 #ifdef  RSS
1220                 case IP_RECVRSSBUCKETID:
1221 #endif
1222                 case IP_VLAN_PCP:
1223                         error = sooptcopyin(sopt, &optval, sizeof optval,
1224                                             sizeof optval);
1225                         if (error)
1226                                 break;
1227
1228                         switch (sopt->sopt_name) {
1229                         case IP_TOS:
1230                                 inp->inp_ip_tos = optval;
1231                                 break;
1232
1233                         case IP_TTL:
1234                                 inp->inp_ip_ttl = optval;
1235                                 break;
1236
1237                         case IP_MINTTL:
1238                                 if (optval >= 0 && optval <= MAXTTL)
1239                                         inp->inp_ip_minttl = optval;
1240                                 else
1241                                         error = EINVAL;
1242                                 break;
1243
1244 #define OPTSET(bit) do {                                                \
1245         INP_WLOCK(inp);                                                 \
1246         if (optval)                                                     \
1247                 inp->inp_flags |= bit;                                  \
1248         else                                                            \
1249                 inp->inp_flags &= ~bit;                                 \
1250         INP_WUNLOCK(inp);                                               \
1251 } while (0)
1252
1253 #define OPTSET2(bit, val) do {                                          \
1254         INP_WLOCK(inp);                                                 \
1255         if (val)                                                        \
1256                 inp->inp_flags2 |= bit;                                 \
1257         else                                                            \
1258                 inp->inp_flags2 &= ~bit;                                \
1259         INP_WUNLOCK(inp);                                               \
1260 } while (0)
1261
1262                         case IP_RECVOPTS:
1263                                 OPTSET(INP_RECVOPTS);
1264                                 break;
1265
1266                         case IP_RECVRETOPTS:
1267                                 OPTSET(INP_RECVRETOPTS);
1268                                 break;
1269
1270                         case IP_RECVDSTADDR:
1271                                 OPTSET(INP_RECVDSTADDR);
1272                                 break;
1273
1274                         case IP_ORIGDSTADDR:
1275                                 OPTSET2(INP_ORIGDSTADDR, optval);
1276                                 break;
1277
1278                         case IP_RECVTTL:
1279                                 OPTSET(INP_RECVTTL);
1280                                 break;
1281
1282                         case IP_RECVIF:
1283                                 OPTSET(INP_RECVIF);
1284                                 break;
1285
1286                         case IP_ONESBCAST:
1287                                 OPTSET(INP_ONESBCAST);
1288                                 break;
1289                         case IP_DONTFRAG:
1290                                 OPTSET(INP_DONTFRAG);
1291                                 break;
1292                         case IP_BINDANY:
1293                                 OPTSET(INP_BINDANY);
1294                                 break;
1295                         case IP_RECVTOS:
1296                                 OPTSET(INP_RECVTOS);
1297                                 break;
1298                         case IP_BINDMULTI:
1299                                 OPTSET2(INP_BINDMULTI, optval);
1300                                 break;
1301                         case IP_RECVFLOWID:
1302                                 OPTSET2(INP_RECVFLOWID, optval);
1303                                 break;
1304 #ifdef  RSS
1305                         case IP_RSS_LISTEN_BUCKET:
1306                                 if ((optval >= 0) &&
1307                                     (optval < rss_getnumbuckets())) {
1308                                         inp->inp_rss_listen_bucket = optval;
1309                                         OPTSET2(INP_RSS_BUCKET_SET, 1);
1310                                 } else {
1311                                         error = EINVAL;
1312                                 }
1313                                 break;
1314                         case IP_RECVRSSBUCKETID:
1315                                 OPTSET2(INP_RECVRSSBUCKETID, optval);
1316                                 break;
1317 #endif
1318                         case IP_VLAN_PCP:
1319                                 if ((optval >= -1) && (optval <=
1320                                     (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1321                                         if (optval == -1) {
1322                                                 INP_WLOCK(inp);
1323                                                 inp->inp_flags2 &=
1324                                                     ~(INP_2PCP_SET |
1325                                                       INP_2PCP_MASK);
1326                                                 INP_WUNLOCK(inp);
1327                                         } else {
1328                                                 INP_WLOCK(inp);
1329                                                 inp->inp_flags2 |=
1330                                                     INP_2PCP_SET;
1331                                                 inp->inp_flags2 &=
1332                                                     ~INP_2PCP_MASK;
1333                                                 inp->inp_flags2 |=
1334                                                     optval << INP_2PCP_SHIFT;
1335                                                 INP_WUNLOCK(inp);
1336                                         }
1337                                 } else
1338                                         error = EINVAL;
1339                                 break;
1340                         }
1341                         break;
1342 #undef OPTSET
1343 #undef OPTSET2
1344
1345                 /*
1346                  * Multicast socket options are processed by the in_mcast
1347                  * module.
1348                  */
1349                 case IP_MULTICAST_IF:
1350                 case IP_MULTICAST_VIF:
1351                 case IP_MULTICAST_TTL:
1352                 case IP_MULTICAST_LOOP:
1353                 case IP_ADD_MEMBERSHIP:
1354                 case IP_DROP_MEMBERSHIP:
1355                 case IP_ADD_SOURCE_MEMBERSHIP:
1356                 case IP_DROP_SOURCE_MEMBERSHIP:
1357                 case IP_BLOCK_SOURCE:
1358                 case IP_UNBLOCK_SOURCE:
1359                 case IP_MSFILTER:
1360                 case MCAST_JOIN_GROUP:
1361                 case MCAST_LEAVE_GROUP:
1362                 case MCAST_JOIN_SOURCE_GROUP:
1363                 case MCAST_LEAVE_SOURCE_GROUP:
1364                 case MCAST_BLOCK_SOURCE:
1365                 case MCAST_UNBLOCK_SOURCE:
1366                         error = inp_setmoptions(inp, sopt);
1367                         break;
1368
1369                 case IP_PORTRANGE:
1370                         error = sooptcopyin(sopt, &optval, sizeof optval,
1371                                             sizeof optval);
1372                         if (error)
1373                                 break;
1374
1375                         INP_WLOCK(inp);
1376                         switch (optval) {
1377                         case IP_PORTRANGE_DEFAULT:
1378                                 inp->inp_flags &= ~(INP_LOWPORT);
1379                                 inp->inp_flags &= ~(INP_HIGHPORT);
1380                                 break;
1381
1382                         case IP_PORTRANGE_HIGH:
1383                                 inp->inp_flags &= ~(INP_LOWPORT);
1384                                 inp->inp_flags |= INP_HIGHPORT;
1385                                 break;
1386
1387                         case IP_PORTRANGE_LOW:
1388                                 inp->inp_flags &= ~(INP_HIGHPORT);
1389                                 inp->inp_flags |= INP_LOWPORT;
1390                                 break;
1391
1392                         default:
1393                                 error = EINVAL;
1394                                 break;
1395                         }
1396                         INP_WUNLOCK(inp);
1397                         break;
1398
1399 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1400                 case IP_IPSEC_POLICY:
1401                         if (IPSEC_ENABLED(ipv4)) {
1402                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1403                                 break;
1404                         }
1405                         /* FALLTHROUGH */
1406 #endif /* IPSEC */
1407
1408                 default:
1409                         error = ENOPROTOOPT;
1410                         break;
1411                 }
1412                 break;
1413
1414         case SOPT_GET:
1415                 switch (sopt->sopt_name) {
1416                 case IP_OPTIONS:
1417                 case IP_RETOPTS:
1418                         INP_RLOCK(inp);
1419                         if (inp->inp_options) {
1420                                 struct mbuf *options;
1421
1422                                 options = m_copym(inp->inp_options, 0,
1423                                     M_COPYALL, M_NOWAIT);
1424                                 INP_RUNLOCK(inp);
1425                                 if (options != NULL) {
1426                                         error = sooptcopyout(sopt,
1427                                                              mtod(options, char *),
1428                                                              options->m_len);
1429                                         m_freem(options);
1430                                 } else
1431                                         error = ENOMEM;
1432                         } else {
1433                                 INP_RUNLOCK(inp);
1434                                 sopt->sopt_valsize = 0;
1435                         }
1436                         break;
1437
1438                 case IP_TOS:
1439                 case IP_TTL:
1440                 case IP_MINTTL:
1441                 case IP_RECVOPTS:
1442                 case IP_RECVRETOPTS:
1443                 case IP_ORIGDSTADDR:
1444                 case IP_RECVDSTADDR:
1445                 case IP_RECVTTL:
1446                 case IP_RECVIF:
1447                 case IP_PORTRANGE:
1448                 case IP_ONESBCAST:
1449                 case IP_DONTFRAG:
1450                 case IP_BINDANY:
1451                 case IP_RECVTOS:
1452                 case IP_BINDMULTI:
1453                 case IP_FLOWID:
1454                 case IP_FLOWTYPE:
1455                 case IP_RECVFLOWID:
1456 #ifdef  RSS
1457                 case IP_RSSBUCKETID:
1458                 case IP_RECVRSSBUCKETID:
1459 #endif
1460                 case IP_VLAN_PCP:
1461                         switch (sopt->sopt_name) {
1462                         case IP_TOS:
1463                                 optval = inp->inp_ip_tos;
1464                                 break;
1465
1466                         case IP_TTL:
1467                                 optval = inp->inp_ip_ttl;
1468                                 break;
1469
1470                         case IP_MINTTL:
1471                                 optval = inp->inp_ip_minttl;
1472                                 break;
1473
1474 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
1475 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
1476
1477                         case IP_RECVOPTS:
1478                                 optval = OPTBIT(INP_RECVOPTS);
1479                                 break;
1480
1481                         case IP_RECVRETOPTS:
1482                                 optval = OPTBIT(INP_RECVRETOPTS);
1483                                 break;
1484
1485                         case IP_RECVDSTADDR:
1486                                 optval = OPTBIT(INP_RECVDSTADDR);
1487                                 break;
1488
1489                         case IP_ORIGDSTADDR:
1490                                 optval = OPTBIT2(INP_ORIGDSTADDR);
1491                                 break;
1492
1493                         case IP_RECVTTL:
1494                                 optval = OPTBIT(INP_RECVTTL);
1495                                 break;
1496
1497                         case IP_RECVIF:
1498                                 optval = OPTBIT(INP_RECVIF);
1499                                 break;
1500
1501                         case IP_PORTRANGE:
1502                                 if (inp->inp_flags & INP_HIGHPORT)
1503                                         optval = IP_PORTRANGE_HIGH;
1504                                 else if (inp->inp_flags & INP_LOWPORT)
1505                                         optval = IP_PORTRANGE_LOW;
1506                                 else
1507                                         optval = 0;
1508                                 break;
1509
1510                         case IP_ONESBCAST:
1511                                 optval = OPTBIT(INP_ONESBCAST);
1512                                 break;
1513                         case IP_DONTFRAG:
1514                                 optval = OPTBIT(INP_DONTFRAG);
1515                                 break;
1516                         case IP_BINDANY:
1517                                 optval = OPTBIT(INP_BINDANY);
1518                                 break;
1519                         case IP_RECVTOS:
1520                                 optval = OPTBIT(INP_RECVTOS);
1521                                 break;
1522                         case IP_FLOWID:
1523                                 optval = inp->inp_flowid;
1524                                 break;
1525                         case IP_FLOWTYPE:
1526                                 optval = inp->inp_flowtype;
1527                                 break;
1528                         case IP_RECVFLOWID:
1529                                 optval = OPTBIT2(INP_RECVFLOWID);
1530                                 break;
1531 #ifdef  RSS
1532                         case IP_RSSBUCKETID:
1533                                 retval = rss_hash2bucket(inp->inp_flowid,
1534                                     inp->inp_flowtype,
1535                                     &rss_bucket);
1536                                 if (retval == 0)
1537                                         optval = rss_bucket;
1538                                 else
1539                                         error = EINVAL;
1540                                 break;
1541                         case IP_RECVRSSBUCKETID:
1542                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1543                                 break;
1544 #endif
1545                         case IP_BINDMULTI:
1546                                 optval = OPTBIT2(INP_BINDMULTI);
1547                                 break;
1548                         case IP_VLAN_PCP:
1549                                 if (OPTBIT2(INP_2PCP_SET)) {
1550                                         optval = (inp->inp_flags2 &
1551                                             INP_2PCP_MASK) >> INP_2PCP_SHIFT;
1552                                 } else {
1553                                         optval = -1;
1554                                 }
1555                                 break;
1556                         }
1557                         error = sooptcopyout(sopt, &optval, sizeof optval);
1558                         break;
1559
1560                 /*
1561                  * Multicast socket options are processed by the in_mcast
1562                  * module.
1563                  */
1564                 case IP_MULTICAST_IF:
1565                 case IP_MULTICAST_VIF:
1566                 case IP_MULTICAST_TTL:
1567                 case IP_MULTICAST_LOOP:
1568                 case IP_MSFILTER:
1569                         error = inp_getmoptions(inp, sopt);
1570                         break;
1571
1572 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1573                 case IP_IPSEC_POLICY:
1574                         if (IPSEC_ENABLED(ipv4)) {
1575                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1576                                 break;
1577                         }
1578                         /* FALLTHROUGH */
1579 #endif /* IPSEC */
1580
1581                 default:
1582                         error = ENOPROTOOPT;
1583                         break;
1584                 }
1585                 break;
1586         }
1587         return (error);
1588 }
1589
1590 /*
1591  * Routine called from ip_output() to loop back a copy of an IP multicast
1592  * packet to the input queue of a specified interface.  Note that this
1593  * calls the output routine of the loopback "driver", but with an interface
1594  * pointer that might NOT be a loopback interface -- evil, but easier than
1595  * replicating that code here.
1596  */
1597 static void
1598 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1599 {
1600         struct ip *ip;
1601         struct mbuf *copym;
1602
1603         /*
1604          * Make a deep copy of the packet because we're going to
1605          * modify the pack in order to generate checksums.
1606          */
1607         copym = m_dup(m, M_NOWAIT);
1608         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1609                 copym = m_pullup(copym, hlen);
1610         if (copym != NULL) {
1611                 /* If needed, compute the checksum and mark it as valid. */
1612                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1613                         in_delayed_cksum(copym);
1614                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1615                         copym->m_pkthdr.csum_flags |=
1616                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1617                         copym->m_pkthdr.csum_data = 0xffff;
1618                 }
1619                 /*
1620                  * We don't bother to fragment if the IP length is greater
1621                  * than the interface's MTU.  Can this possibly matter?
1622                  */
1623                 ip = mtod(copym, struct ip *);
1624                 ip->ip_sum = 0;
1625                 ip->ip_sum = in_cksum(copym, hlen);
1626                 if_simloop(ifp, copym, AF_INET, 0);
1627         }
1628 }