bsd/netinet6/raw_ip6.c

   1 /*
   2  * Copyright (c) 2000-2016 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/route.h>
 106 #include <net/if_types.h>
 107
 108 #include <netinet/in.h>
 109 #include <netinet/in_var.h>
 110 #include <netinet/in_systm.h>
 111 #include <netinet/in_tclass.h>
 112 #include <netinet/ip6.h>
 113 #include <netinet6/ip6_var.h>
 114 #include <netinet/icmp6.h>
 115 #include <netinet/in_pcb.h>
 116 #include <netinet6/in6_pcb.h>
 117 #include <netinet6/nd6.h>
 118 #include <netinet6/ip6protosw.h>
 119 #include <netinet6/scope6_var.h>
 120 #include <netinet6/raw_ip6.h>
 121
 122 #if IPSEC
 123 #include <netinet6/ipsec.h>
 124 #include <netinet6/ipsec6.h>
 125 #endif /*IPSEC*/
 126
 127 #if NECP
 128 #include <net/necp.h>
 129 #endif
 130
 131 /*
 132  * Raw interface to IP6 protocol.
 133  */
 134
 135 extern struct   inpcbhead ripcb;
 136 extern struct   inpcbinfo ripcbinfo;
 137 extern u_int32_t        rip_sendspace;
 138 extern u_int32_t        rip_recvspace;
 139
 140 struct rip6stat rip6stat;
 141
 142 /*
 143  * Setup generic address and protocol structures
 144  * for raw_input routine, then pass them along with
 145  * mbuf chain.
 146  */
 147 int
 148 rip6_input(
 149         struct  mbuf **mp,
 150         int     *offp,
 151         int     proto)
 152 {
 153         struct mbuf *m = *mp;
 154         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 155         struct inpcb *in6p;
 156         struct inpcb *last = 0;
 157         struct mbuf *opts = NULL;
 158         struct sockaddr_in6 rip6src;
 159         int ret;
 160         struct ifnet *ifp = m->m_pkthdr.rcvif;
 161
 162         /* Expect 32-bit aligned data pointer on strict-align platforms */
 163         MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
 164
 165         rip6stat.rip6s_ipackets++;
 166
 167         init_sin6(&rip6src, m); /* general init */
 168
 169         lck_rw_lock_shared(ripcbinfo.ipi_lock);
 170         LIST_FOREACH(in6p, &ripcb, inp_list) {
 171                 if ((in6p->in6p_vflag & INP_IPV6) == 0)
 172                         continue;
 173                 if (in6p->in6p_ip6_nxt &&
 174                     in6p->in6p_ip6_nxt != proto)
 175                         continue;
 176                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
 177                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
 178                         continue;
 179                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
 180                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
 181                         continue;
 182
 183                 if (inp_restricted_recv(in6p, ifp))
 184                         continue;
 185
 186                 if (proto == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
 187                         rip6stat.rip6s_isum++;
 188                         if (in6_cksum(m, ip6->ip6_nxt, *offp,
 189                             m->m_pkthdr.len - *offp)) {
 190                                 rip6stat.rip6s_badsum++;
 191                                 continue;
 192                         }
 193                 }
 194                 if (last) {
 195                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
 196
 197 #if NECP
 198                         if (n && !necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 199                                 &ip6->ip6_dst, &ip6->ip6_src, ifp, NULL, NULL)) {
 200                                 m_freem(n);
 201                                 /* do not inject data into pcb */
 202                         } else
 203 #endif /* NECP */
 204                         if (n) {
 205                                 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
 206                                     (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 207                                     (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
 208                                         ret = ip6_savecontrol(last, n, &opts);
 209                                         if (ret != 0) {
 210                                                 m_freem(n);
 211                                                 m_freem(opts);
 212                                                 last = in6p;
 213                                                 continue;
 214                                         }
 215                                 }
 216                                 /* strip intermediate headers */
 217                                 m_adj(n, *offp);
 218                                 so_recv_data_stat(last->in6p_socket, m, 0);
 219                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 220                                                 (struct sockaddr *)&rip6src,
 221                                                  n, opts, NULL) == 0) {
 222                                         rip6stat.rip6s_fullsock++;
 223                                 } else
 224                                         sorwakeup(last->in6p_socket);
 225                                 opts = NULL;
 226                         }
 227                 }
 228                 last = in6p;
 229         }
 230
 231 #if NECP
 232         if (last && !necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 233                 &ip6->ip6_dst, &ip6->ip6_src, ifp, NULL, NULL)) {
 234                 m_freem(m);
 235                 ip6stat.ip6s_delivered--;
 236                 /* do not inject data into pcb */
 237         } else
 238 #endif /* NECP */
 239         if (last) {
 240                 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
 241                     (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 242                     (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
 243                         ret = ip6_savecontrol(last, m, &opts);
 244                         if (ret != 0) {
 245                                 m_freem(m);
 246                                 m_freem(opts);
 247                                 ip6stat.ip6s_delivered--;
 248                                 goto unlock;
 249                         }
 250
 251                 }
 252                 /* strip intermediate headers */
 253                 m_adj(m, *offp);
 254                 so_recv_data_stat(last->in6p_socket, m, 0);
 255                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 256                                 (struct sockaddr *)&rip6src, m, opts, NULL) == 0) {
 257                         rip6stat.rip6s_fullsock++;
 258                 } else
 259                         sorwakeup(last->in6p_socket);
 260         } else {
 261                 rip6stat.rip6s_nosock++;
 262                 if (m->m_flags & M_MCAST)
 263                         rip6stat.rip6s_nosockmcast++;
 264                 if (proto == IPPROTO_NONE)
 265                         m_freem(m);
 266                 else {
 267                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
 268                         icmp6_error(m, ICMP6_PARAM_PROB,
 269                                     ICMP6_PARAMPROB_NEXTHEADER,
 270                                     prvnxtp - mtod(m, char *));
 271                 }
 272                 ip6stat.ip6s_delivered--;
 273         }
 274
 275 unlock:
 276         lck_rw_done(ripcbinfo.ipi_lock);
 277
 278         return IPPROTO_DONE;
 279 }
 280
 281 void
 282 rip6_ctlinput(
 283         int cmd,
 284         struct sockaddr *sa,
 285         void *d)
 286 {
 287         struct ip6_hdr *ip6;
 288         struct mbuf *m;
 289         void *cmdarg = NULL;
 290         int off = 0;
 291         struct ip6ctlparam *ip6cp = NULL;
 292         const struct sockaddr_in6 *sa6_src = NULL;
 293         void (*notify)(struct inpcb *, int) = in6_rtchange;
 294
 295         if (sa->sa_family != AF_INET6 ||
 296             sa->sa_len != sizeof(struct sockaddr_in6))
 297                 return;
 298
 299         if ((unsigned)cmd >= PRC_NCMDS)
 300                 return;
 301         if (PRC_IS_REDIRECT(cmd)) {
 302                 notify = in6_rtchange;
 303                 d = NULL;
 304         } else if (cmd == PRC_HOSTDEAD)
 305                 d = NULL;
 306         else if (inet6ctlerrmap[cmd] == 0)
 307                 return;
 308
 309         /* if the parameter is from icmp6, decode it. */
 310         if (d != NULL) {
 311                 ip6cp = (struct ip6ctlparam *)d;
 312                 m = ip6cp->ip6c_m;
 313                 ip6 = ip6cp->ip6c_ip6;
 314                 off = ip6cp->ip6c_off;
 315                 cmdarg = ip6cp->ip6c_cmdarg;
 316                 sa6_src = ip6cp->ip6c_src;
 317         } else {
 318                 m = NULL;
 319                 ip6 = NULL;
 320                 sa6_src = &sa6_any;
 321         }
 322
 323         (void) in6_pcbnotify(&ripcbinfo, sa, 0, (const struct sockaddr *)sa6_src,
 324                              0, cmd, cmdarg, notify);
 325 }
 326
 327 /*
 328  * Generate IPv6 header and pass packet to ip6_output.
 329  * Tack on options user may have setup with control call.
 330  */
 331 int
 332 rip6_output(
 333         struct mbuf *m,
 334         struct socket *so,
 335         struct sockaddr_in6 *dstsock,
 336         struct mbuf *control,
 337         int israw)
 338 {
 339         struct in6_addr *dst;
 340         struct ip6_hdr *ip6;
 341         struct inpcb *in6p;
 342         u_int   plen = m->m_pkthdr.len;
 343         int error = 0;
 344         struct ip6_pktopts opt, *optp = NULL;
 345         struct ip6_moptions *im6o = NULL;
 346         struct ifnet *oifp = NULL;
 347         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
 348         int sotc = SO_TC_UNSPEC;
 349         int netsvctype = _NET_SERVICE_TYPE_UNSPEC;
 350         struct ip6_out_args ip6oa =
 351             { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF, 0, 0, 0 };
 352         int flags = IPV6_OUTARGS;
 353
 354         in6p = sotoin6pcb(so);
 355
 356         if (in6p == NULL
 357 #if NECP
 358                 || (necp_socket_should_use_flow_divert(in6p))
 359 #endif /* NECP */
 360                 ) {
 361                 if (in6p == NULL)
 362                         error = EINVAL;
 363                 else
 364                         error = EPROTOTYPE;
 365                 goto bad;
 366         }
 367         if (dstsock != NULL && IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
 368                 error = EINVAL;
 369                 goto bad;
 370         }
 371
 372         if (in6p->inp_flags & INP_BOUND_IF) {
 373                 ip6oa.ip6oa_boundif = in6p->inp_boundifp->if_index;
 374                 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
 375         }
 376         if (INP_NO_CELLULAR(in6p))
 377                 ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
 378         if (INP_NO_EXPENSIVE(in6p))
 379                 ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
 380         if (INP_AWDL_UNRESTRICTED(in6p))
 381                 ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
 382         if (INP_INTCOPROC_ALLOWED(in6p))
 383                 ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED;
 384
 385         dst = &dstsock->sin6_addr;
 386         if (control) {
 387                 sotc = so_tc_from_control(control, &netsvctype);
 388
 389                 if ((error = ip6_setpktopts(control, &opt, NULL,
 390                     SOCK_PROTO(so))) != 0)
 391                         goto bad;
 392                 optp = &opt;
 393         } else
 394                 optp = in6p->in6p_outputopts;
 395         if (sotc == SO_TC_UNSPEC) {
 396                 sotc = so->so_traffic_class;
 397                 netsvctype = so->so_netsvctype;
 398         }
 399         ip6oa.ip6oa_sotc = sotc;
 400         ip6oa.ip6oa_netsvctype = netsvctype;
 401
 402         /*
 403          * For an ICMPv6 packet, we should know its type and code
 404          * to update statistics.
 405          */
 406         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 407                 struct icmp6_hdr *icmp6;
 408                 if (m->m_len < sizeof(struct icmp6_hdr) &&
 409                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
 410                         error = ENOBUFS;
 411                         goto bad;
 412                 }
 413                 icmp6 = mtod(m, struct icmp6_hdr *);
 414                 type = icmp6->icmp6_type;
 415                 code = icmp6->icmp6_code;
 416         }
 417
 418         if (in6p->inp_flowhash == 0)
 419                 in6p->inp_flowhash = inp_calc_flowhash(in6p);
 420         /* update flowinfo - RFC 6437 */
 421         if (in6p->inp_flow == 0 && in6p->in6p_flags & IN6P_AUTOFLOWLABEL) {
 422                 in6p->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 423                 in6p->inp_flow |=
 424                     (htonl(in6p->inp_flowhash) & IPV6_FLOWLABEL_MASK);
 425         }
 426
 427         M_PREPEND(m, sizeof(*ip6), M_WAIT, 1);
 428         if (m == NULL) {
 429                 error = ENOBUFS;
 430                 goto bad;
 431         }
 432         ip6 = mtod(m, struct ip6_hdr *);
 433
 434         /*
 435          * Next header might not be ICMP6 but use its pseudo header anyway.
 436          */
 437         ip6->ip6_dst = *dst;
 438
 439         im6o = in6p->in6p_moptions;
 440
 441         /*
 442          * If the scope of the destination is link-local, embed the interface
 443          * index in the address.
 444          *
 445          * XXX advanced-api value overrides sin6_scope_id
 446          */
 447         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 448                 struct in6_pktinfo *pi;
 449                 struct ifnet *im6o_multicast_ifp = NULL;
 450
 451                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && im6o != NULL) {
 452                         IM6O_LOCK(im6o);
 453                         im6o_multicast_ifp = im6o->im6o_multicast_ifp;
 454                         IM6O_UNLOCK(im6o);
 455                 }
 456                 /*
 457                  * XXX Boundary check is assumed to be already done in
 458                  * ip6_setpktoptions().
 459                  */
 460                 ifnet_head_lock_shared();
 461                 if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
 462                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
 463                         oifp = ifindex2ifnet[pi->ipi6_ifindex];
 464                         if (oifp != NULL)
 465                                 ifnet_reference(oifp);
 466                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 467                     im6o != NULL && im6o_multicast_ifp != NULL) {
 468                         oifp = im6o_multicast_ifp;
 469                         ifnet_reference(oifp);
 470                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
 471                 } else if (dstsock->sin6_scope_id) {
 472                         /*
 473                          * boundary check
 474                          *
 475                          * Sinced stsock->sin6_scope_id is unsigned, we don't
 476                          * need to check if it's < 0
 477                          */
 478                         if (if_index < dstsock->sin6_scope_id) {
 479                                 error = ENXIO;  /* XXX EINVAL? */
 480                                 ifnet_head_done();
 481                                 goto bad;
 482                         }
 483                         ip6->ip6_dst.s6_addr16[1]
 484                                 = htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
 485                 }
 486                 ifnet_head_done();
 487         }
 488
 489         /*
 490          * Source address selection.
 491          */
 492         {
 493                 struct in6_addr *in6a;
 494                 struct in6_addr storage;
 495                 u_short index = 0;
 496
 497                 if (israw != 0 && optp && optp->ip6po_pktinfo && !IN6_IS_ADDR_UNSPECIFIED(&optp->ip6po_pktinfo->ipi6_addr)) {
 498                         in6a = &optp->ip6po_pktinfo->ipi6_addr;
 499                         flags |= IPV6_FLAG_NOSRCIFSEL;
 500                 } else if ((in6a = in6_selectsrc(dstsock, optp, in6p,
 501                     &in6p->in6p_route, NULL, &storage, ip6oa.ip6oa_boundif,
 502                     &error)) == 0) {
 503                         if (error == 0)
 504                                 error = EADDRNOTAVAIL;
 505                         goto bad;
 506                 } else {
 507                         ip6oa.ip6oa_flags |= IP6OAF_BOUND_SRCADDR;
 508                 }
 509                 ip6->ip6_src = *in6a;
 510                 if (in6p->in6p_route.ro_rt != NULL) {
 511                         RT_LOCK(in6p->in6p_route.ro_rt);
 512                         if (in6p->in6p_route.ro_rt->rt_ifp != NULL)
 513                                 index = in6p->in6p_route.ro_rt->rt_ifp->if_index;
 514                         RT_UNLOCK(in6p->in6p_route.ro_rt);
 515                         if (oifp != NULL)
 516                                 ifnet_release(oifp);
 517                         ifnet_head_lock_shared();
 518                         if (index == 0 || if_index < index) {
 519                                 panic("bad if_index on interface from route");
 520                         }
 521                         oifp = ifindex2ifnet[index];
 522                         if (oifp != NULL)
 523                                 ifnet_reference(oifp);
 524                         ifnet_head_done();
 525                 }
 526         }
 527         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
 528                 (in6p->inp_flow & IPV6_FLOWINFO_MASK);
 529         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
 530                 (IPV6_VERSION & IPV6_VERSION_MASK);
 531         /* ip6_plen will be filled in ip6_output, so not fill it here. */
 532         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
 533         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
 534
 535         if (SOCK_PROTO(so) == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
 536                 struct mbuf *n;
 537                 int off;
 538                 u_int16_t *p;
 539
 540                 /* compute checksum */
 541                 if (SOCK_PROTO(so) == IPPROTO_ICMPV6)
 542                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
 543                 else
 544                         off = in6p->in6p_cksum;
 545                 if (plen < (unsigned int)(off + 1)) {
 546                         error = EINVAL;
 547                         goto bad;
 548                 }
 549                 off += sizeof(struct ip6_hdr);
 550
 551                 n = m;
 552                 while (n && n->m_len <= off) {
 553                         off -= n->m_len;
 554                         n = n->m_next;
 555                 }
 556                 if (!n)
 557                         goto bad;
 558                 p = (u_int16_t *)(void *)(mtod(n, caddr_t) + off);
 559                 *p = 0;
 560                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
 561         }
 562
 563 #if NECP
 564         {
 565                 necp_kernel_policy_id policy_id;
 566                 u_int32_t route_rule_id;
 567
 568                 /*
 569                  * We need a route to perform NECP route rule checks
 570                  */
 571                 if (net_qos_policy_restricted != 0 &&
 572                     ROUTE_UNUSABLE(&in6p->in6p_route)) {
 573                         struct sockaddr_in6 to;
 574                         struct sockaddr_in6 from;
 575
 576                         ROUTE_RELEASE(&in6p->in6p_route);
 577
 578                         bzero(&from, sizeof(struct sockaddr_in6));
 579                         from.sin6_family = AF_INET6;
 580                         from.sin6_len = sizeof(struct sockaddr_in6);
 581                         from.sin6_addr = ip6->ip6_src;
 582
 583                         bzero(&to, sizeof(struct sockaddr_in6));
 584                         to.sin6_family = AF_INET6;
 585                         to.sin6_len = sizeof(struct sockaddr_in6);
 586                         to.sin6_addr = ip6->ip6_dst;
 587
 588                         in6p->in6p_route.ro_dst.sin6_family = AF_INET6;
 589                         in6p->in6p_route.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
 590                         ((struct sockaddr_in6 *)(void *)&in6p->in6p_route.ro_dst)->sin6_addr =
 591                                 ip6->ip6_dst;
 592
 593                         rtalloc_scoped((struct route *)&in6p->in6p_route, ip6oa.ip6oa_boundif);
 594
 595                         inp_update_necp_policy(in6p, (struct sockaddr *)&from,
 596                             (struct sockaddr *)&to, ip6oa.ip6oa_boundif);
 597                         in6p->inp_policyresult.results.qos_marking_gencount = 0;
 598                 }
 599
 600                 if (!necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 601                         &ip6->ip6_src, &ip6->ip6_dst, NULL, &policy_id, &route_rule_id)) {
 602                         error = EHOSTUNREACH;
 603                         goto bad;
 604                 }
 605
 606                 necp_mark_packet_from_socket(m, in6p, policy_id, route_rule_id);
 607
 608                 if (net_qos_policy_restricted != 0) {
 609                         necp_socket_update_qos_marking(in6p, in6p->in6p_route.ro_rt,
 610                             NULL, route_rule_id);
 611                 }
 612         }
 613 #endif /* NECP */
 614         if ((so->so_flags1 & SOF1_QOSMARKING_ALLOWED))
 615                 ip6oa.ip6oa_flags |= IP6OAF_QOSMARKING_ALLOWED;
 616
 617 #if IPSEC
 618         if (in6p->in6p_sp != NULL && ipsec_setsocket(m, so) != 0) {
 619                 error = ENOBUFS;
 620                 goto bad;
 621         }
 622 #endif /*IPSEC*/
 623
 624         if (ROUTE_UNUSABLE(&in6p->in6p_route))
 625                 ROUTE_RELEASE(&in6p->in6p_route);
 626
 627         if (oifp != NULL) {
 628                 ifnet_release(oifp);
 629                 oifp = NULL;
 630         }
 631
 632         set_packet_service_class(m, so, sotc, PKT_SCF_IPV6);
 633         m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB;
 634         m->m_pkthdr.pkt_flowid = in6p->inp_flowhash;
 635         m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC |
 636             PKTF_FLOW_RAWSOCK);
 637         m->m_pkthdr.pkt_proto = in6p->in6p_ip6_nxt;
 638
 639         if (im6o != NULL)
 640                 IM6O_ADDREF(im6o);
 641
 642         error = ip6_output(m, optp, &in6p->in6p_route, flags, im6o,
 643             &oifp, &ip6oa);
 644
 645         if (im6o != NULL)
 646                 IM6O_REMREF(im6o);
 647
 648         if (in6p->in6p_route.ro_rt != NULL) {
 649                 struct rtentry *rt = in6p->in6p_route.ro_rt;
 650                 struct ifnet *outif;
 651
 652                 if ((rt->rt_flags & RTF_MULTICAST) ||
 653                     in6p->in6p_socket == NULL ||
 654                     !(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
 655                         rt = NULL;      /* unusable */
 656                 }
 657                 /*
 658                  * Always discard the cached route for unconnected
 659                  * socket or if it is a multicast route.
 660                  */
 661                 if (rt == NULL)
 662                         ROUTE_RELEASE(&in6p->in6p_route);
 663
 664                 /*
 665                  * If this is a connected socket and the destination
 666                  * route is not multicast, update outif with that of
 667                  * the route interface index used by IP.
 668                  */
 669                 if (rt != NULL &&
 670                     (outif = rt->rt_ifp) != in6p->in6p_last_outifp)
 671                         in6p->in6p_last_outifp = outif;
 672         } else {
 673                 ROUTE_RELEASE(&in6p->in6p_route);
 674         }
 675
 676         /*
 677          * If output interface was cellular/expensive, and this socket is
 678          * denied access to it, generate an event.
 679          */
 680         if (error != 0 && (ip6oa.ip6oa_retflags & IP6OARF_IFDENIED) &&
 681             (INP_NO_CELLULAR(in6p) || INP_NO_EXPENSIVE(in6p)))
 682                 soevent(in6p->inp_socket, (SO_FILT_HINT_LOCKED|
 683                     SO_FILT_HINT_IFDENIED));
 684
 685         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 686                 if (oifp)
 687                         icmp6_ifoutstat_inc(oifp, type, code);
 688                 icmp6stat.icp6s_outhist[type]++;
 689         } else
 690                 rip6stat.rip6s_opackets++;
 691
 692         goto freectl;
 693
 694 bad:
 695         if (m != NULL)
 696                 m_freem(m);
 697
 698 freectl:
 699         if (optp == &opt && optp->ip6po_rthdr)
 700                 ROUTE_RELEASE(&optp->ip6po_route);
 701
 702         if (control != NULL) {
 703                 if (optp == &opt)
 704                         ip6_clearpktopts(optp, -1);
 705                 m_freem(control);
 706         }
 707         if (oifp != NULL)
 708                 ifnet_release(oifp);
 709         return(error);
 710 }
 711
 712 /*
 713  * Raw IPv6 socket option processing.
 714  */
 715 int
 716 rip6_ctloutput(
 717         struct socket *so,
 718         struct sockopt *sopt)
 719 {
 720         int error, optval;
 721
 722         /* Allow <SOL_SOCKET,SO_FLUSH> at this level */
 723         if (sopt->sopt_level == IPPROTO_ICMPV6)
 724                 /*
 725                  * XXX: is it better to call icmp6_ctloutput() directly
 726                  * from protosw?
 727                  */
 728                 return(icmp6_ctloutput(so, sopt));
 729         else if (sopt->sopt_level != IPPROTO_IPV6 &&
 730             !(sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_FLUSH))
 731                 return (EINVAL);
 732
 733         error = 0;
 734
 735         switch (sopt->sopt_dir) {
 736         case SOPT_GET:
 737                 switch (sopt->sopt_name) {
 738                 case IPV6_CHECKSUM:
 739                         error = ip6_raw_ctloutput(so, sopt);
 740                         break;
 741                 default:
 742                         error = ip6_ctloutput(so, sopt);
 743                         break;
 744                 }
 745                 break;
 746
 747         case SOPT_SET:
 748                 switch (sopt->sopt_name) {
 749                 case IPV6_CHECKSUM:
 750                         error = ip6_raw_ctloutput(so, sopt);
 751                         break;
 752
 753                 case SO_FLUSH:
 754                         if ((error = sooptcopyin(sopt, &optval, sizeof (optval),
 755                             sizeof (optval))) != 0)
 756                                 break;
 757
 758                         error = inp_flush(sotoinpcb(so), optval);
 759                         break;
 760
 761                 default:
 762                         error = ip6_ctloutput(so, sopt);
 763                         break;
 764                 }
 765                 break;
 766         }
 767
 768         return (error);
 769 }
 770
 771 static int
 772 rip6_attach(struct socket *so, int proto, struct proc *p)
 773 {
 774         struct inpcb *inp;
 775         int error;
 776
 777         inp = sotoinpcb(so);
 778         if (inp)
 779                 panic("rip6_attach");
 780         if ((error = proc_suser(p)) != 0)
 781                 return error;
 782
 783         error = soreserve(so, rip_sendspace, rip_recvspace);
 784         if (error)
 785                 return error;
 786         error = in_pcballoc(so, &ripcbinfo, p);
 787         if (error)
 788                 return error;
 789         inp = (struct inpcb *)so->so_pcb;
 790         inp->inp_vflag |= INP_IPV6;
 791         inp->in6p_ip6_nxt = (char)proto;
 792         inp->in6p_hops = -1;    /* use kernel default */
 793         inp->in6p_cksum = -1;
 794         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
 795                sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
 796         if (inp->in6p_icmp6filt == NULL)
 797                 return (ENOMEM);
 798         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
 799         return 0;
 800 }
 801
 802 static int
 803 rip6_detach(struct socket *so)
 804 {
 805         struct inpcb *inp;
 806
 807         inp = sotoinpcb(so);
 808         if (inp == 0)
 809                 panic("rip6_detach");
 810         /* xxx: RSVP */
 811         if (inp->in6p_icmp6filt) {
 812                 FREE(inp->in6p_icmp6filt, M_PCB);
 813                 inp->in6p_icmp6filt = NULL;
 814         }
 815         in6_pcbdetach(inp);
 816         return 0;
 817 }
 818
 819 static int
 820 rip6_abort(struct socket *so)
 821 {
 822         soisdisconnected(so);
 823         return rip6_detach(so);
 824 }
 825
 826 static int
 827 rip6_disconnect(struct socket *so)
 828 {
 829         struct inpcb *inp = sotoinpcb(so);
 830
 831         if ((so->so_state & SS_ISCONNECTED) == 0)
 832                 return ENOTCONN;
 833         inp->in6p_faddr = in6addr_any;
 834         return rip6_abort(so);
 835 }
 836
 837 static int
 838 rip6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
 839 {
 840 #pragma unused(p)
 841         struct inpcb *inp = sotoinpcb(so);
 842         struct sockaddr_in6 sin6;
 843         struct ifaddr *ifa = NULL;
 844         struct ifnet *outif = NULL;
 845         int error;
 846
 847         if (inp == NULL
 848 #if NECP
 849                 || (necp_socket_should_use_flow_divert(inp))
 850 #endif /* NECP */
 851                 )
 852                 return (inp == NULL ? EINVAL : EPROTOTYPE);
 853
 854         if (nam->sa_len != sizeof (struct sockaddr_in6))
 855                 return (EINVAL);
 856
 857         if (TAILQ_EMPTY(&ifnet_head) || SIN6(nam)->sin6_family != AF_INET6)
 858                 return (EADDRNOTAVAIL);
 859
 860         bzero(&sin6, sizeof (sin6));
 861         *(&sin6) = *SIN6(nam);
 862
 863         if ((error = sa6_embedscope(&sin6, ip6_use_defzone)) != 0)
 864                 return (error);
 865
 866         /* Sanitize local copy for address searches */
 867         sin6.sin6_flowinfo = 0;
 868         sin6.sin6_scope_id = 0;
 869         sin6.sin6_port = 0;
 870
 871         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) &&
 872             (ifa = ifa_ifwithaddr(SA(&sin6))) == 0)
 873                 return (EADDRNOTAVAIL);
 874         if (ifa != NULL) {
 875                 IFA_LOCK(ifa);
 876                 if (((struct in6_ifaddr *)ifa)->ia6_flags &
 877                     (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
 878                      IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
 879                         IFA_UNLOCK(ifa);
 880                         IFA_REMREF(ifa);
 881                         return (EADDRNOTAVAIL);
 882                 }
 883                 outif = ifa->ifa_ifp;
 884                 IFA_UNLOCK(ifa);
 885                 IFA_REMREF(ifa);
 886         }
 887         inp->in6p_laddr = sin6.sin6_addr;
 888         inp->in6p_last_outifp = outif;
 889         return (0);
 890 }
 891
 892 static int
 893 rip6_connect(struct socket *so, struct sockaddr *nam, __unused struct proc *p)
 894 {
 895         struct inpcb *inp = sotoinpcb(so);
 896         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(void *)nam;
 897         struct in6_addr *in6a = NULL;
 898         struct in6_addr storage;
 899         int error = 0;
 900 #if ENABLE_DEFAULT_SCOPE
 901         struct sockaddr_in6 tmp;
 902 #endif
 903         unsigned int ifscope;
 904         struct ifnet *outif = NULL;
 905
 906         if (inp == NULL
 907 #if NECP
 908                 || (necp_socket_should_use_flow_divert(inp))
 909 #endif /* NECP */
 910                 )
 911                 return (inp == NULL ? EINVAL : EPROTOTYPE);
 912         if (nam->sa_len != sizeof(*addr))
 913                 return EINVAL;
 914         if (TAILQ_EMPTY(&ifnet_head))
 915                 return EADDRNOTAVAIL;
 916         if (addr->sin6_family != AF_INET6)
 917                 return EAFNOSUPPORT;
 918 #if ENABLE_DEFAULT_SCOPE
 919         if (addr->sin6_scope_id == 0) { /* not change if specified  */
 920                 /* avoid overwrites */
 921                 tmp = *addr;
 922                 addr = &tmp;
 923                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
 924         }
 925 #endif
 926
 927         /* KAME hack: embed scopeid */
 928         if (in6_embedscope(&SIN6(nam)->sin6_addr, SIN6(nam), inp, NULL, NULL) != 0)
 929                 return (EINVAL);
 930
 931         ifscope = (inp->inp_flags & INP_BOUND_IF) ?
 932             inp->inp_boundifp->if_index : IFSCOPE_NONE;
 933
 934         /* Source address selection. XXX: need pcblookup? */
 935         in6a = in6_selectsrc(addr, inp->in6p_outputopts, inp, &inp->in6p_route,
 936             NULL, &storage, ifscope, &error);
 937         if (in6a == NULL)
 938                 return (error ? error : EADDRNOTAVAIL);
 939         inp->in6p_laddr = *in6a;
 940         inp->in6p_faddr = addr->sin6_addr;
 941         if (inp->in6p_route.ro_rt != NULL)
 942                 outif = inp->in6p_route.ro_rt->rt_ifp;
 943         inp->in6p_last_outifp = outif;
 944         soisconnected(so);
 945         return 0;
 946 }
 947
 948 static int
 949 rip6_shutdown(struct socket *so)
 950 {
 951         socantsendmore(so);
 952         return 0;
 953 }
 954
 955 static int
 956 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 957     struct mbuf *control, struct proc *p)
 958 {
 959 #pragma unused(flags, p)
 960         struct inpcb *inp = sotoinpcb(so);
 961         struct sockaddr_in6 tmp;
 962         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam;
 963         int error = 0;
 964
 965         if (inp == NULL
 966 #if NECP
 967                 || (necp_socket_should_use_flow_divert(inp))
 968 #endif /* NECP */
 969                 ) {
 970                 if (inp == NULL)
 971                         error = EINVAL;
 972                 else
 973                         error = EPROTOTYPE;
 974                 goto bad;
 975         }
 976
 977         /* always copy sockaddr to avoid overwrites */
 978         if (so->so_state & SS_ISCONNECTED) {
 979                 if (nam != NULL) {
 980                         error = EISCONN;
 981                         goto bad;
 982                 }
 983                 /* XXX */
 984                 bzero(&tmp, sizeof(tmp));
 985                 tmp.sin6_family = AF_INET6;
 986                 tmp.sin6_len = sizeof(struct sockaddr_in6);
 987                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
 988                       sizeof(struct in6_addr));
 989                 dst = &tmp;
 990         } else {
 991                 if (nam == NULL) {
 992                         error = ENOTCONN;
 993                         goto bad;
 994                 }
 995                 tmp = *(struct sockaddr_in6 *)(void *)nam;
 996                 dst = &tmp;
 997         }
 998 #if ENABLE_DEFAULT_SCOPE
 999         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
1000                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
1001         }
1002 #endif
1003         return (rip6_output(m, so, dst, control, 1));
1004
1005 bad:
1006         VERIFY(error != 0);
1007
1008         if (m != NULL)
1009                 m_freem(m);
1010         if (control != NULL)
1011                 m_freem(control);
1012
1013         return (error);
1014 }
1015
1016 struct pr_usrreqs rip6_usrreqs = {
1017         .pru_abort =            rip6_abort,
1018         .pru_attach =           rip6_attach,
1019         .pru_bind =             rip6_bind,
1020         .pru_connect =          rip6_connect,
1021         .pru_control =          in6_control,
1022         .pru_detach =           rip6_detach,
1023         .pru_disconnect =       rip6_disconnect,
1024         .pru_peeraddr =         in6_getpeeraddr,
1025         .pru_send =             rip6_send,
1026         .pru_shutdown =         rip6_shutdown,
1027         .pru_sockaddr =         in6_getsockaddr,
1028         .pru_sosend =           sosend,
1029         .pru_soreceive =        soreceive,
1030 };
1031
1032 __private_extern__ struct pr_usrreqs icmp6_dgram_usrreqs = {
1033         .pru_abort =            rip6_abort,
1034         .pru_attach =           icmp6_dgram_attach,
1035         .pru_bind =             rip6_bind,
1036         .pru_connect =          rip6_connect,
1037         .pru_control =          in6_control,
1038         .pru_detach =           rip6_detach,
1039         .pru_disconnect =       rip6_disconnect,
1040         .pru_peeraddr =         in6_getpeeraddr,
1041         .pru_send =             icmp6_dgram_send,
1042         .pru_shutdown =         rip6_shutdown,
1043         .pru_sockaddr =         in6_getsockaddr,
1044         .pru_sosend =           sosend,
1045         .pru_soreceive =        soreceive,
1046 };