bsd/netinet6/raw_ip6.c

   1 /*
   2  * Copyright (c) 2000-2018 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  30  * All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. Neither the name of the project nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  *
  56  * $FreeBSD: src/sys/netinet6/raw_ip6.c,v 1.7.2.4 2001/07/29 19:32:40 ume Exp $
  57  */
  58
  59 /*
  60  * Copyright (c) 1982, 1986, 1988, 1993
  61  *      The Regents of the University of California.  All rights reserved.
  62  *
  63  * Redistribution and use in source and binary forms, with or without
  64  * modification, are permitted provided that the following conditions
  65  * are met:
  66  * 1. Redistributions of source code must retain the above copyright
  67  *    notice, this list of conditions and the following disclaimer.
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in the
  70  *    documentation and/or other materials provided with the distribution.
  71  * 3. All advertising materials mentioning features or use of this software
  72  *    must display the following acknowledgement:
  73  *      This product includes software developed by the University of
  74  *      California, Berkeley and its contributors.
  75  * 4. Neither the name of the University nor the names of its contributors
  76  *    may be used to endorse or promote products derived from this software
  77  *    without specific prior written permission.
  78  *
  79  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  80  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  81  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  82  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  83  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  84  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  85  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  86  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  87  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  88  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  89  * SUCH DAMAGE.
  90  *
  91  *      @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
  92  */
  93 #include <sys/param.h>
  94 #include <sys/malloc.h>
  95 #include <sys/proc.h>
  96 #include <sys/mcache.h>
  97 #include <sys/mbuf.h>
  98 #include <sys/socket.h>
  99 #include <sys/protosw.h>
 100 #include <sys/socketvar.h>
 101 #include <sys/errno.h>
 102 #include <sys/systm.h>
 103
 104 #include <net/if.h>
 105 #include <net/net_api_stats.h>
 106 #include <net/route.h>
 107 #include <net/if_types.h>
 108
 109 #include <netinet/in.h>
 110 #include <netinet/in_var.h>
 111 #include <netinet/in_systm.h>
 112 #include <netinet/in_tclass.h>
 113 #include <netinet/ip6.h>
 114 #include <netinet6/ip6_var.h>
 115 #include <netinet/icmp6.h>
 116 #include <netinet/in_pcb.h>
 117 #include <netinet6/in6_pcb.h>
 118 #include <netinet6/nd6.h>
 119 #include <netinet6/ip6protosw.h>
 120 #include <netinet6/scope6_var.h>
 121 #include <netinet6/raw_ip6.h>
 122
 123 #if IPSEC
 124 #include <netinet6/ipsec.h>
 125 #include <netinet6/ipsec6.h>
 126 #endif /*IPSEC*/
 127
 128 #if NECP
 129 #include <net/necp.h>
 130 #endif
 131
 132 /*
 133  * Raw interface to IP6 protocol.
 134  */
 135
 136 extern struct   inpcbhead ripcb;
 137 extern struct   inpcbinfo ripcbinfo;
 138 extern u_int32_t        rip_sendspace;
 139 extern u_int32_t        rip_recvspace;
 140
 141 struct rip6stat rip6stat;
 142
 143 /*
 144  * Setup generic address and protocol structures
 145  * for raw_input routine, then pass them along with
 146  * mbuf chain.
 147  */
 148 int
 149 rip6_input(
 150         struct  mbuf **mp,
 151         int     *offp,
 152         int     proto)
 153 {
 154         struct mbuf *m = *mp;
 155         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 156         struct inpcb *in6p;
 157         struct inpcb *last = 0;
 158         struct mbuf *opts = NULL;
 159         struct sockaddr_in6 rip6src;
 160         int ret;
 161         struct ifnet *ifp = m->m_pkthdr.rcvif;
 162
 163         /* Expect 32-bit aligned data pointer on strict-align platforms */
 164         MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
 165
 166         rip6stat.rip6s_ipackets++;
 167
 168         init_sin6(&rip6src, m); /* general init */
 169
 170         lck_rw_lock_shared(ripcbinfo.ipi_lock);
 171         LIST_FOREACH(in6p, &ripcb, inp_list) {
 172                 if ((in6p->in6p_vflag & INP_IPV6) == 0) {
 173                         continue;
 174                 }
 175                 if (in6p->in6p_ip6_nxt &&
 176                     in6p->in6p_ip6_nxt != proto) {
 177                         continue;
 178                 }
 179                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
 180                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) {
 181                         continue;
 182                 }
 183                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
 184                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) {
 185                         continue;
 186                 }
 187
 188                 if (inp_restricted_recv(in6p, ifp)) {
 189                         continue;
 190                 }
 191
 192                 if (proto == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
 193                         rip6stat.rip6s_isum++;
 194                         if (in6_cksum(m, ip6->ip6_nxt, *offp,
 195                             m->m_pkthdr.len - *offp)) {
 196                                 rip6stat.rip6s_badsum++;
 197                                 continue;
 198                         }
 199                 }
 200                 if (last) {
 201                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
 202
 203 #if NECP
 204                         if (n && !necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 205                             &ip6->ip6_dst, &ip6->ip6_src, ifp, NULL, NULL, NULL)) {
 206                                 m_freem(n);
 207                                 /* do not inject data into pcb */
 208                         } else
 209 #endif /* NECP */
 210                         if (n) {
 211                                 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
 212                                     (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 213                                     (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 ||
 214                                     (last->in6p_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) {
 215                                         ret = ip6_savecontrol(last, n, &opts);
 216                                         if (ret != 0) {
 217                                                 m_freem(n);
 218                                                 m_freem(opts);
 219                                                 last = in6p;
 220                                                 continue;
 221                                         }
 222                                 }
 223                                 /* strip intermediate headers */
 224                                 m_adj(n, *offp);
 225                                 so_recv_data_stat(last->in6p_socket, m, 0);
 226                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 227                                     (struct sockaddr *)&rip6src,
 228                                     n, opts, NULL) == 0) {
 229                                         rip6stat.rip6s_fullsock++;
 230                                 } else {
 231                                         sorwakeup(last->in6p_socket);
 232                                 }
 233                                 opts = NULL;
 234                         }
 235                 }
 236                 last = in6p;
 237         }
 238
 239 #if NECP
 240         if (last && !necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 241             &ip6->ip6_dst, &ip6->ip6_src, ifp, NULL, NULL, NULL)) {
 242                 m_freem(m);
 243                 ip6stat.ip6s_delivered--;
 244                 /* do not inject data into pcb */
 245         } else
 246 #endif /* NECP */
 247         if (last) {
 248                 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
 249                     (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 250                     (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 ||
 251                     (last->in6p_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) {
 252                         ret = ip6_savecontrol(last, m, &opts);
 253                         if (ret != 0) {
 254                                 m_freem(m);
 255                                 m_freem(opts);
 256                                 ip6stat.ip6s_delivered--;
 257                                 goto unlock;
 258                         }
 259                 }
 260                 /* strip intermediate headers */
 261                 m_adj(m, *offp);
 262                 so_recv_data_stat(last->in6p_socket, m, 0);
 263                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 264                     (struct sockaddr *)&rip6src, m, opts, NULL) == 0) {
 265                         rip6stat.rip6s_fullsock++;
 266                 } else {
 267                         sorwakeup(last->in6p_socket);
 268                 }
 269         } else {
 270                 rip6stat.rip6s_nosock++;
 271                 if (m->m_flags & M_MCAST) {
 272                         rip6stat.rip6s_nosockmcast++;
 273                 }
 274                 if (proto == IPPROTO_NONE) {
 275                         m_freem(m);
 276                 } else {
 277                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
 278                         icmp6_error(m, ICMP6_PARAM_PROB,
 279                             ICMP6_PARAMPROB_NEXTHEADER,
 280                             prvnxtp - mtod(m, char *));
 281                 }
 282                 ip6stat.ip6s_delivered--;
 283         }
 284
 285 unlock:
 286         lck_rw_done(ripcbinfo.ipi_lock);
 287
 288         return IPPROTO_DONE;
 289 }
 290
 291 void
 292 rip6_ctlinput(
 293         int cmd,
 294         struct sockaddr *sa,
 295         void *d,
 296         __unused struct ifnet *ifp)
 297 {
 298         struct ip6_hdr *ip6;
 299         struct mbuf *m;
 300         void *cmdarg = NULL;
 301         int off = 0;
 302         struct ip6ctlparam *ip6cp = NULL;
 303         const struct sockaddr_in6 *sa6_src = NULL;
 304         void (*notify)(struct inpcb *, int) = in6_rtchange;
 305
 306         if (sa->sa_family != AF_INET6 ||
 307             sa->sa_len != sizeof(struct sockaddr_in6)) {
 308                 return;
 309         }
 310
 311         if ((unsigned)cmd >= PRC_NCMDS) {
 312                 return;
 313         }
 314         if (PRC_IS_REDIRECT(cmd)) {
 315                 notify = in6_rtchange;
 316                 d = NULL;
 317         } else if (cmd == PRC_HOSTDEAD) {
 318                 d = NULL;
 319         } else if (inet6ctlerrmap[cmd] == 0) {
 320                 return;
 321         }
 322
 323         /* if the parameter is from icmp6, decode it. */
 324         if (d != NULL) {
 325                 ip6cp = (struct ip6ctlparam *)d;
 326                 m = ip6cp->ip6c_m;
 327                 ip6 = ip6cp->ip6c_ip6;
 328                 off = ip6cp->ip6c_off;
 329                 cmdarg = ip6cp->ip6c_cmdarg;
 330                 sa6_src = ip6cp->ip6c_src;
 331         } else {
 332                 m = NULL;
 333                 ip6 = NULL;
 334                 sa6_src = &sa6_any;
 335         }
 336
 337         (void) in6_pcbnotify(&ripcbinfo, sa, 0, (const struct sockaddr *)sa6_src,
 338             0, cmd, cmdarg, notify);
 339 }
 340
 341 /*
 342  * Generate IPv6 header and pass packet to ip6_output.
 343  * Tack on options user may have setup with control call.
 344  */
 345 int
 346 rip6_output(
 347         struct mbuf *m,
 348         struct socket *so,
 349         struct sockaddr_in6 *dstsock,
 350         struct mbuf *control,
 351         int israw)
 352 {
 353         struct in6_addr *dst;
 354         struct ip6_hdr *ip6;
 355         struct inpcb *in6p;
 356         u_int   plen = m->m_pkthdr.len;
 357         int error = 0;
 358         struct ip6_pktopts opt, *optp = NULL;
 359         struct ip6_moptions *im6o = NULL;
 360         struct ifnet *oifp = NULL;
 361         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
 362         int sotc = SO_TC_UNSPEC;
 363         int netsvctype = _NET_SERVICE_TYPE_UNSPEC;
 364         struct ip6_out_args ip6oa;
 365         int flags = IPV6_OUTARGS;
 366
 367         in6p = sotoin6pcb(so);
 368
 369         bzero(&ip6oa, sizeof(ip6oa));
 370         ip6oa.ip6oa_boundif = IFSCOPE_NONE;
 371         ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF;
 372
 373         if (in6p == NULL
 374 #if NECP
 375             || (necp_socket_should_use_flow_divert(in6p))
 376 #endif /* NECP */
 377             ) {
 378                 if (in6p == NULL) {
 379                         error = EINVAL;
 380                 } else {
 381                         error = EPROTOTYPE;
 382                 }
 383                 goto bad;
 384         }
 385         if (dstsock != NULL && IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
 386                 error = EINVAL;
 387                 goto bad;
 388         }
 389
 390         if (in6p->inp_flags & INP_BOUND_IF) {
 391                 ip6oa.ip6oa_boundif = in6p->inp_boundifp->if_index;
 392                 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
 393         }
 394         if (INP_NO_CELLULAR(in6p)) {
 395                 ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
 396         }
 397         if (INP_NO_EXPENSIVE(in6p)) {
 398                 ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
 399         }
 400         if (INP_AWDL_UNRESTRICTED(in6p)) {
 401                 ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
 402         }
 403         if (INP_INTCOPROC_ALLOWED(in6p)) {
 404                 ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED;
 405         }
 406
 407         dst = &dstsock->sin6_addr;
 408         if (control) {
 409                 sotc = so_tc_from_control(control, &netsvctype);
 410
 411                 if ((error = ip6_setpktopts(control, &opt, NULL,
 412                     SOCK_PROTO(so))) != 0) {
 413                         goto bad;
 414                 }
 415                 optp = &opt;
 416         } else {
 417                 optp = in6p->in6p_outputopts;
 418         }
 419         if (sotc == SO_TC_UNSPEC) {
 420                 sotc = so->so_traffic_class;
 421                 netsvctype = so->so_netsvctype;
 422         }
 423         ip6oa.ip6oa_sotc = sotc;
 424         ip6oa.ip6oa_netsvctype = netsvctype;
 425
 426         /*
 427          * For an ICMPv6 packet, we should know its type and code
 428          * to update statistics.
 429          */
 430         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 431                 struct icmp6_hdr *icmp6;
 432                 if (m->m_len < sizeof(struct icmp6_hdr) &&
 433                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
 434                         error = ENOBUFS;
 435                         goto bad;
 436                 }
 437                 icmp6 = mtod(m, struct icmp6_hdr *);
 438                 type = icmp6->icmp6_type;
 439                 code = icmp6->icmp6_code;
 440         }
 441
 442         if (in6p->inp_flowhash == 0) {
 443                 in6p->inp_flowhash = inp_calc_flowhash(in6p);
 444         }
 445         /* update flowinfo - RFC 6437 */
 446         if (in6p->inp_flow == 0 && in6p->in6p_flags & IN6P_AUTOFLOWLABEL) {
 447                 in6p->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 448                 in6p->inp_flow |=
 449                     (htonl(in6p->inp_flowhash) & IPV6_FLOWLABEL_MASK);
 450         }
 451
 452         M_PREPEND(m, sizeof(*ip6), M_WAIT, 1);
 453         if (m == NULL) {
 454                 error = ENOBUFS;
 455                 goto bad;
 456         }
 457         ip6 = mtod(m, struct ip6_hdr *);
 458
 459         /*
 460          * Next header might not be ICMP6 but use its pseudo header anyway.
 461          */
 462         ip6->ip6_dst = *dst;
 463
 464         im6o = in6p->in6p_moptions;
 465
 466         /*
 467          * If the scope of the destination is link-local, embed the interface
 468          * index in the address.
 469          *
 470          * XXX advanced-api value overrides sin6_scope_id
 471          */
 472         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 473                 struct in6_pktinfo *pi;
 474                 struct ifnet *im6o_multicast_ifp = NULL;
 475
 476                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && im6o != NULL) {
 477                         IM6O_LOCK(im6o);
 478                         im6o_multicast_ifp = im6o->im6o_multicast_ifp;
 479                         IM6O_UNLOCK(im6o);
 480                 }
 481                 /*
 482                  * XXX Boundary check is assumed to be already done in
 483                  * ip6_setpktoptions().
 484                  */
 485                 ifnet_head_lock_shared();
 486                 if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
 487                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
 488                         oifp = ifindex2ifnet[pi->ipi6_ifindex];
 489                         if (oifp != NULL) {
 490                                 ifnet_reference(oifp);
 491                         }
 492                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 493                     im6o != NULL && im6o_multicast_ifp != NULL) {
 494                         oifp = im6o_multicast_ifp;
 495                         ifnet_reference(oifp);
 496                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
 497                 } else if (dstsock->sin6_scope_id) {
 498                         /*
 499                          * boundary check
 500                          *
 501                          * Sinced stsock->sin6_scope_id is unsigned, we don't
 502                          * need to check if it's < 0
 503                          */
 504                         if (if_index < dstsock->sin6_scope_id) {
 505                                 error = ENXIO;  /* XXX EINVAL? */
 506                                 ifnet_head_done();
 507                                 goto bad;
 508                         }
 509                         ip6->ip6_dst.s6_addr16[1]
 510                                 = htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
 511                 }
 512                 ifnet_head_done();
 513         }
 514
 515         /*
 516          * Source address selection.
 517          */
 518         {
 519                 struct in6_addr *in6a;
 520                 struct in6_addr storage;
 521                 u_short index = 0;
 522
 523                 if (israw != 0 && optp && optp->ip6po_pktinfo && !IN6_IS_ADDR_UNSPECIFIED(&optp->ip6po_pktinfo->ipi6_addr)) {
 524                         in6a = &optp->ip6po_pktinfo->ipi6_addr;
 525                         flags |= IPV6_FLAG_NOSRCIFSEL;
 526                 } else if ((in6a = in6_selectsrc(dstsock, optp, in6p,
 527                     &in6p->in6p_route, NULL, &storage, ip6oa.ip6oa_boundif,
 528                     &error)) == 0) {
 529                         if (error == 0) {
 530                                 error = EADDRNOTAVAIL;
 531                         }
 532                         goto bad;
 533                 } else {
 534                         ip6oa.ip6oa_flags |= IP6OAF_BOUND_SRCADDR;
 535                 }
 536                 ip6->ip6_src = *in6a;
 537                 if (in6p->in6p_route.ro_rt != NULL) {
 538                         RT_LOCK(in6p->in6p_route.ro_rt);
 539                         if (in6p->in6p_route.ro_rt->rt_ifp != NULL) {
 540                                 index = in6p->in6p_route.ro_rt->rt_ifp->if_index;
 541                         }
 542                         RT_UNLOCK(in6p->in6p_route.ro_rt);
 543                         if (oifp != NULL) {
 544                                 ifnet_release(oifp);
 545                         }
 546                         ifnet_head_lock_shared();
 547                         if (index == 0 || if_index < index) {
 548                                 panic("bad if_index on interface from route");
 549                         }
 550                         oifp = ifindex2ifnet[index];
 551                         if (oifp != NULL) {
 552                                 ifnet_reference(oifp);
 553                         }
 554                         ifnet_head_done();
 555                 }
 556         }
 557         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
 558             (in6p->inp_flow & IPV6_FLOWINFO_MASK);
 559         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
 560             (IPV6_VERSION & IPV6_VERSION_MASK);
 561         /* ip6_plen will be filled in ip6_output, so not fill it here. */
 562         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
 563         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
 564
 565         if (SOCK_PROTO(so) == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
 566                 struct mbuf *n;
 567                 int off;
 568                 u_int16_t *p;
 569
 570                 /* compute checksum */
 571                 if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 572                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
 573                 } else {
 574                         off = in6p->in6p_cksum;
 575                 }
 576                 if (plen < (unsigned int)(off + 1)) {
 577                         error = EINVAL;
 578                         goto bad;
 579                 }
 580                 off += sizeof(struct ip6_hdr);
 581
 582                 n = m;
 583                 while (n && n->m_len <= off) {
 584                         off -= n->m_len;
 585                         n = n->m_next;
 586                 }
 587                 if (!n) {
 588                         goto bad;
 589                 }
 590                 p = (u_int16_t *)(void *)(mtod(n, caddr_t) + off);
 591                 *p = 0;
 592                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
 593         }
 594
 595 #if NECP
 596         {
 597                 necp_kernel_policy_id policy_id;
 598                 necp_kernel_policy_id skip_policy_id;
 599                 u_int32_t route_rule_id;
 600
 601                 /*
 602                  * We need a route to perform NECP route rule checks
 603                  */
 604                 if (net_qos_policy_restricted != 0 &&
 605                     ROUTE_UNUSABLE(&in6p->in6p_route)) {
 606                         struct sockaddr_in6 to;
 607                         struct sockaddr_in6 from;
 608
 609                         ROUTE_RELEASE(&in6p->in6p_route);
 610
 611                         bzero(&from, sizeof(struct sockaddr_in6));
 612                         from.sin6_family = AF_INET6;
 613                         from.sin6_len = sizeof(struct sockaddr_in6);
 614                         from.sin6_addr = ip6->ip6_src;
 615
 616                         bzero(&to, sizeof(struct sockaddr_in6));
 617                         to.sin6_family = AF_INET6;
 618                         to.sin6_len = sizeof(struct sockaddr_in6);
 619                         to.sin6_addr = ip6->ip6_dst;
 620
 621                         in6p->in6p_route.ro_dst.sin6_family = AF_INET6;
 622                         in6p->in6p_route.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
 623                         ((struct sockaddr_in6 *)(void *)&in6p->in6p_route.ro_dst)->sin6_addr =
 624                             ip6->ip6_dst;
 625
 626                         rtalloc_scoped((struct route *)&in6p->in6p_route, ip6oa.ip6oa_boundif);
 627
 628                         inp_update_necp_policy(in6p, (struct sockaddr *)&from,
 629                             (struct sockaddr *)&to, ip6oa.ip6oa_boundif);
 630                         in6p->inp_policyresult.results.qos_marking_gencount = 0;
 631                 }
 632
 633                 if (!necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 634                     &ip6->ip6_src, &ip6->ip6_dst, NULL, &policy_id, &route_rule_id, &skip_policy_id)) {
 635                         error = EHOSTUNREACH;
 636                         goto bad;
 637                 }
 638
 639                 necp_mark_packet_from_socket(m, in6p, policy_id, route_rule_id, skip_policy_id);
 640
 641                 if (net_qos_policy_restricted != 0) {
 642                         necp_socket_update_qos_marking(in6p, in6p->in6p_route.ro_rt,
 643                             NULL, route_rule_id);
 644                 }
 645         }
 646 #endif /* NECP */
 647         if ((so->so_flags1 & SOF1_QOSMARKING_ALLOWED)) {
 648                 ip6oa.ip6oa_flags |= IP6OAF_QOSMARKING_ALLOWED;
 649         }
 650
 651 #if IPSEC
 652         if (in6p->in6p_sp != NULL && ipsec_setsocket(m, so) != 0) {
 653                 error = ENOBUFS;
 654                 goto bad;
 655         }
 656 #endif /*IPSEC*/
 657
 658         if (ROUTE_UNUSABLE(&in6p->in6p_route)) {
 659                 ROUTE_RELEASE(&in6p->in6p_route);
 660         }
 661
 662         if (oifp != NULL) {
 663                 ifnet_release(oifp);
 664                 oifp = NULL;
 665         }
 666
 667         set_packet_service_class(m, so, sotc, PKT_SCF_IPV6);
 668         m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB;
 669         m->m_pkthdr.pkt_flowid = in6p->inp_flowhash;
 670         m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC |
 671             PKTF_FLOW_RAWSOCK);
 672         m->m_pkthdr.pkt_proto = in6p->in6p_ip6_nxt;
 673         m->m_pkthdr.tx_rawip_pid = so->last_pid;
 674         if (so->so_flags & SOF_DELEGATED) {
 675                 m->m_pkthdr.tx_rawip_e_pid = so->e_pid;
 676         } else {
 677                 m->m_pkthdr.tx_rawip_e_pid = 0;
 678         }
 679
 680         if (im6o != NULL) {
 681                 IM6O_ADDREF(im6o);
 682         }
 683
 684         error = ip6_output(m, optp, &in6p->in6p_route, flags, im6o,
 685             &oifp, &ip6oa);
 686
 687         if (im6o != NULL) {
 688                 IM6O_REMREF(im6o);
 689         }
 690
 691         if (in6p->in6p_route.ro_rt != NULL) {
 692                 struct rtentry *rt = in6p->in6p_route.ro_rt;
 693                 struct ifnet *outif;
 694
 695                 if ((rt->rt_flags & RTF_MULTICAST) ||
 696                     in6p->in6p_socket == NULL ||
 697                     !(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
 698                         rt = NULL;      /* unusable */
 699                 }
 700                 /*
 701                  * Always discard the cached route for unconnected
 702                  * socket or if it is a multicast route.
 703                  */
 704                 if (rt == NULL) {
 705                         ROUTE_RELEASE(&in6p->in6p_route);
 706                 }
 707
 708                 /*
 709                  * If this is a connected socket and the destination
 710                  * route is not multicast, update outif with that of
 711                  * the route interface index used by IP.
 712                  */
 713                 if (rt != NULL &&
 714                     (outif = rt->rt_ifp) != in6p->in6p_last_outifp) {
 715                         in6p->in6p_last_outifp = outif;
 716                 }
 717         } else {
 718                 ROUTE_RELEASE(&in6p->in6p_route);
 719         }
 720
 721         /*
 722          * If output interface was cellular/expensive, and this socket is
 723          * denied access to it, generate an event.
 724          */
 725         if (error != 0 && (ip6oa.ip6oa_retflags & IP6OARF_IFDENIED) &&
 726             (INP_NO_CELLULAR(in6p) || INP_NO_EXPENSIVE(in6p))) {
 727                 soevent(in6p->inp_socket, (SO_FILT_HINT_LOCKED |
 728                     SO_FILT_HINT_IFDENIED));
 729         }
 730
 731         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 732                 if (oifp) {
 733                         icmp6_ifoutstat_inc(oifp, type, code);
 734                 }
 735                 icmp6stat.icp6s_outhist[type]++;
 736         } else {
 737                 rip6stat.rip6s_opackets++;
 738         }
 739
 740         goto freectl;
 741
 742 bad:
 743         if (m != NULL) {
 744                 m_freem(m);
 745         }
 746
 747 freectl:
 748         if (optp == &opt && optp->ip6po_rthdr) {
 749                 ROUTE_RELEASE(&optp->ip6po_route);
 750         }
 751
 752         if (control != NULL) {
 753                 if (optp == &opt) {
 754                         ip6_clearpktopts(optp, -1);
 755                 }
 756                 m_freem(control);
 757         }
 758         if (oifp != NULL) {
 759                 ifnet_release(oifp);
 760         }
 761         return error;
 762 }
 763
 764 /*
 765  * Raw IPv6 socket option processing.
 766  */
 767 int
 768 rip6_ctloutput(
 769         struct socket *so,
 770         struct sockopt *sopt)
 771 {
 772         int error, optval;
 773
 774         /* Allow <SOL_SOCKET,SO_FLUSH> at this level */
 775         if (sopt->sopt_level == IPPROTO_ICMPV6) {
 776                 /*
 777                  * XXX: is it better to call icmp6_ctloutput() directly
 778                  * from protosw?
 779                  */
 780                 return icmp6_ctloutput(so, sopt);
 781         } else if (sopt->sopt_level != IPPROTO_IPV6 &&
 782             !(sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_FLUSH)) {
 783                 return EINVAL;
 784         }
 785
 786         error = 0;
 787
 788         switch (sopt->sopt_dir) {
 789         case SOPT_GET:
 790                 switch (sopt->sopt_name) {
 791                 case IPV6_CHECKSUM:
 792                         error = ip6_raw_ctloutput(so, sopt);
 793                         break;
 794                 default:
 795                         error = ip6_ctloutput(so, sopt);
 796                         break;
 797                 }
 798                 break;
 799
 800         case SOPT_SET:
 801                 switch (sopt->sopt_name) {
 802                 case IPV6_CHECKSUM:
 803                         error = ip6_raw_ctloutput(so, sopt);
 804                         break;
 805
 806                 case SO_FLUSH:
 807                         if ((error = sooptcopyin(sopt, &optval, sizeof(optval),
 808                             sizeof(optval))) != 0) {
 809                                 break;
 810                         }
 811
 812                         error = inp_flush(sotoinpcb(so), optval);
 813                         break;
 814
 815                 default:
 816                         error = ip6_ctloutput(so, sopt);
 817                         break;
 818                 }
 819                 break;
 820         }
 821
 822         return error;
 823 }
 824
 825 static int
 826 rip6_attach(struct socket *so, int proto, struct proc *p)
 827 {
 828         struct inpcb *inp;
 829         int error;
 830
 831         inp = sotoinpcb(so);
 832         if (inp) {
 833                 panic("rip6_attach");
 834         }
 835         if ((error = proc_suser(p)) != 0) {
 836                 return error;
 837         }
 838
 839         error = soreserve(so, rip_sendspace, rip_recvspace);
 840         if (error) {
 841                 return error;
 842         }
 843         error = in_pcballoc(so, &ripcbinfo, p);
 844         if (error) {
 845                 return error;
 846         }
 847         inp = (struct inpcb *)so->so_pcb;
 848         inp->inp_vflag |= INP_IPV6;
 849         inp->in6p_ip6_nxt = (char)proto;
 850         inp->in6p_hops = -1;    /* use kernel default */
 851         inp->in6p_cksum = -1;
 852         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
 853             sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
 854         if (inp->in6p_icmp6filt == NULL) {
 855                 return ENOMEM;
 856         }
 857         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
 858         return 0;
 859 }
 860
 861 static int
 862 rip6_detach(struct socket *so)
 863 {
 864         struct inpcb *inp;
 865
 866         inp = sotoinpcb(so);
 867         if (inp == 0) {
 868                 panic("rip6_detach");
 869         }
 870         /* xxx: RSVP */
 871         if (inp->in6p_icmp6filt) {
 872                 FREE(inp->in6p_icmp6filt, M_PCB);
 873                 inp->in6p_icmp6filt = NULL;
 874         }
 875         in6_pcbdetach(inp);
 876         return 0;
 877 }
 878
 879 static int
 880 rip6_abort(struct socket *so)
 881 {
 882         soisdisconnected(so);
 883         return rip6_detach(so);
 884 }
 885
 886 static int
 887 rip6_disconnect(struct socket *so)
 888 {
 889         struct inpcb *inp = sotoinpcb(so);
 890
 891         if ((so->so_state & SS_ISCONNECTED) == 0) {
 892                 return ENOTCONN;
 893         }
 894         inp->in6p_faddr = in6addr_any;
 895         return rip6_abort(so);
 896 }
 897
 898 static int
 899 rip6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
 900 {
 901 #pragma unused(p)
 902         struct inpcb *inp = sotoinpcb(so);
 903         struct sockaddr_in6 sin6;
 904         struct ifaddr *ifa = NULL;
 905         struct ifnet *outif = NULL;
 906         int error;
 907
 908         if (inp == NULL
 909 #if NECP
 910             || (necp_socket_should_use_flow_divert(inp))
 911 #endif /* NECP */
 912             ) {
 913                 return inp == NULL ? EINVAL : EPROTOTYPE;
 914         }
 915
 916         if (nam->sa_len != sizeof(struct sockaddr_in6)) {
 917                 return EINVAL;
 918         }
 919
 920         if (TAILQ_EMPTY(&ifnet_head) || SIN6(nam)->sin6_family != AF_INET6) {
 921                 return EADDRNOTAVAIL;
 922         }
 923
 924         bzero(&sin6, sizeof(sin6));
 925         *(&sin6) = *SIN6(nam);
 926
 927         if ((error = sa6_embedscope(&sin6, ip6_use_defzone)) != 0) {
 928                 return error;
 929         }
 930
 931         /* Sanitize local copy for address searches */
 932         sin6.sin6_flowinfo = 0;
 933         sin6.sin6_scope_id = 0;
 934         sin6.sin6_port = 0;
 935
 936         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) &&
 937             (ifa = ifa_ifwithaddr(SA(&sin6))) == 0) {
 938                 return EADDRNOTAVAIL;
 939         }
 940         if (ifa != NULL) {
 941                 IFA_LOCK(ifa);
 942                 if (((struct in6_ifaddr *)ifa)->ia6_flags &
 943                     (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY | IN6_IFF_CLAT46 |
 944                     IN6_IFF_DETACHED | IN6_IFF_DEPRECATED)) {
 945                         IFA_UNLOCK(ifa);
 946                         IFA_REMREF(ifa);
 947                         return EADDRNOTAVAIL;
 948                 }
 949                 outif = ifa->ifa_ifp;
 950                 IFA_UNLOCK(ifa);
 951                 IFA_REMREF(ifa);
 952         }
 953         inp->in6p_laddr = sin6.sin6_addr;
 954         inp->in6p_last_outifp = outif;
 955
 956         return 0;
 957 }
 958
 959 static int
 960 rip6_connect(struct socket *so, struct sockaddr *nam, __unused struct proc *p)
 961 {
 962         struct inpcb *inp = sotoinpcb(so);
 963         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(void *)nam;
 964         struct in6_addr *in6a = NULL;
 965         struct in6_addr storage;
 966         int error = 0;
 967 #if ENABLE_DEFAULT_SCOPE
 968         struct sockaddr_in6 tmp;
 969 #endif
 970         unsigned int ifscope;
 971         struct ifnet *outif = NULL;
 972
 973         if (inp == NULL
 974 #if NECP
 975             || (necp_socket_should_use_flow_divert(inp))
 976 #endif /* NECP */
 977             ) {
 978                 return inp == NULL ? EINVAL : EPROTOTYPE;
 979         }
 980         if (nam->sa_len != sizeof(*addr)) {
 981                 return EINVAL;
 982         }
 983         if (TAILQ_EMPTY(&ifnet_head)) {
 984                 return EADDRNOTAVAIL;
 985         }
 986         if (addr->sin6_family != AF_INET6) {
 987                 return EAFNOSUPPORT;
 988         }
 989
 990         if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
 991                 so->so_flags1 |= SOF1_CONNECT_COUNTED;
 992                 INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet6_dgram_connected);
 993         }
 994
 995 #if ENABLE_DEFAULT_SCOPE
 996         if (addr->sin6_scope_id == 0) { /* not change if specified  */
 997                 /* avoid overwrites */
 998                 tmp = *addr;
 999                 addr = &tmp;
1000                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
1001         }
1002 #endif
1003
1004         /* KAME hack: embed scopeid */
1005         if (in6_embedscope(&SIN6(nam)->sin6_addr, SIN6(nam), inp, NULL, NULL) != 0) {
1006                 return EINVAL;
1007         }
1008
1009         ifscope = (inp->inp_flags & INP_BOUND_IF) ?
1010             inp->inp_boundifp->if_index : IFSCOPE_NONE;
1011
1012         /* Source address selection. XXX: need pcblookup? */
1013         in6a = in6_selectsrc(addr, inp->in6p_outputopts, inp, &inp->in6p_route,
1014             NULL, &storage, ifscope, &error);
1015         if (in6a == NULL) {
1016                 return error ? error : EADDRNOTAVAIL;
1017         }
1018         inp->in6p_laddr = *in6a;
1019         inp->in6p_faddr = addr->sin6_addr;
1020         if (inp->in6p_route.ro_rt != NULL) {
1021                 outif = inp->in6p_route.ro_rt->rt_ifp;
1022         }
1023         inp->in6p_last_outifp = outif;
1024
1025         soisconnected(so);
1026         return 0;
1027 }
1028
1029 static int
1030 rip6_shutdown(struct socket *so)
1031 {
1032         socantsendmore(so);
1033         return 0;
1034 }
1035
1036 static int
1037 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
1038     struct mbuf *control, struct proc *p)
1039 {
1040 #pragma unused(flags, p)
1041         struct inpcb *inp = sotoinpcb(so);
1042         struct sockaddr_in6 tmp;
1043         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam;
1044         int error = 0;
1045
1046         if (inp == NULL
1047 #if NECP
1048             || (necp_socket_should_use_flow_divert(inp))
1049 #endif /* NECP */
1050             ) {
1051                 if (inp == NULL) {
1052                         error = EINVAL;
1053                 } else {
1054                         error = EPROTOTYPE;
1055                 }
1056                 goto bad;
1057         }
1058
1059         /* always copy sockaddr to avoid overwrites */
1060         if (so->so_state & SS_ISCONNECTED) {
1061                 if (nam != NULL) {
1062                         error = EISCONN;
1063                         goto bad;
1064                 }
1065                 /* XXX */
1066                 bzero(&tmp, sizeof(tmp));
1067                 tmp.sin6_family = AF_INET6;
1068                 tmp.sin6_len = sizeof(struct sockaddr_in6);
1069                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
1070                     sizeof(struct in6_addr));
1071                 dst = &tmp;
1072         } else {
1073                 if (nam == NULL) {
1074                         error = ENOTCONN;
1075                         goto bad;
1076                 }
1077                 tmp = *(struct sockaddr_in6 *)(void *)nam;
1078                 dst = &tmp;
1079         }
1080 #if ENABLE_DEFAULT_SCOPE
1081         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
1082                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
1083         }
1084 #endif
1085         return rip6_output(m, so, dst, control, 1);
1086
1087 bad:
1088         VERIFY(error != 0);
1089
1090         if (m != NULL) {
1091                 m_freem(m);
1092         }
1093         if (control != NULL) {
1094                 m_freem(control);
1095         }
1096
1097         return error;
1098 }
1099
1100 struct pr_usrreqs rip6_usrreqs = {
1101         .pru_abort =            rip6_abort,
1102         .pru_attach =           rip6_attach,
1103         .pru_bind =             rip6_bind,
1104         .pru_connect =          rip6_connect,
1105         .pru_control =          in6_control,
1106         .pru_detach =           rip6_detach,
1107         .pru_disconnect =       rip6_disconnect,
1108         .pru_peeraddr =         in6_getpeeraddr,
1109         .pru_send =             rip6_send,
1110         .pru_shutdown =         rip6_shutdown,
1111         .pru_sockaddr =         in6_getsockaddr,
1112         .pru_sosend =           sosend,
1113         .pru_soreceive =        soreceive,
1114 };
1115
1116 __private_extern__ struct pr_usrreqs icmp6_dgram_usrreqs = {
1117         .pru_abort =            rip6_abort,
1118         .pru_attach =           icmp6_dgram_attach,
1119         .pru_bind =             rip6_bind,
1120         .pru_connect =          rip6_connect,
1121         .pru_control =          in6_control,
1122         .pru_detach =           rip6_detach,
1123         .pru_disconnect =       rip6_disconnect,
1124         .pru_peeraddr =         in6_getpeeraddr,
1125         .pru_send =             icmp6_dgram_send,
1126         .pru_shutdown =         rip6_shutdown,
1127         .pru_sockaddr =         in6_getsockaddr,
1128         .pru_sosend =           sosend,
1129         .pru_soreceive =        soreceive,
1130 };