bsd/netinet6/raw_ip6.c

   1 /*
   2  * Copyright (c) 2000-2014 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/ip6.h>
 112 #include <netinet6/ip6_var.h>
 113 #include <netinet/icmp6.h>
 114 #include <netinet/in_pcb.h>
 115 #include <netinet6/in6_pcb.h>
 116 #include <netinet6/nd6.h>
 117 #include <netinet6/ip6protosw.h>
 118 #include <netinet6/scope6_var.h>
 119 #include <netinet6/raw_ip6.h>
 120 #include <netinet6/ip6_fw.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, &ip6->ip6_dst, &ip6->ip6_src, ifp, NULL)) {
 199                                 m_freem(n);
 200                                 /* do not inject data into pcb */
 201                         } else
 202 #endif /* NECP */
 203                         if (n) {
 204                                 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
 205                                     (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 206                                     (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
 207                                         ret = ip6_savecontrol(last, n, &opts);
 208                                         if (ret != 0) {
 209                                                 m_freem(n);
 210                                                 m_freem(opts);
 211                                                 last = in6p;
 212                                                 continue;
 213                                         }
 214                                 }
 215                                 /* strip intermediate headers */
 216                                 m_adj(n, *offp);
 217                                 so_recv_data_stat(last->in6p_socket, m, 0);
 218                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 219                                                 (struct sockaddr *)&rip6src,
 220                                                  n, opts, NULL) == 0) {
 221                                         rip6stat.rip6s_fullsock++;
 222                                 } else
 223                                         sorwakeup(last->in6p_socket);
 224                                 opts = NULL;
 225                         }
 226                 }
 227                 last = in6p;
 228         }
 229
 230 #if NECP
 231         if (last && !necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0, &ip6->ip6_dst, &ip6->ip6_src, ifp, NULL)) {
 232                 m_freem(m);
 233                 ip6stat.ip6s_delivered--;
 234                 /* do not inject data into pcb */
 235         } else
 236 #endif /* NECP */
 237         if (last) {
 238                 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
 239                     (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 240                     (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
 241                         ret = ip6_savecontrol(last, m, &opts);
 242                         if (ret != 0) {
 243                                 m_freem(m);
 244                                 m_freem(opts);
 245                                 ip6stat.ip6s_delivered--;
 246                                 goto unlock;
 247                         }
 248
 249                 }
 250                 /* strip intermediate headers */
 251                 m_adj(m, *offp);
 252                 so_recv_data_stat(last->in6p_socket, m, 0);
 253                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 254                                 (struct sockaddr *)&rip6src, m, opts, NULL) == 0) {
 255                         rip6stat.rip6s_fullsock++;
 256                 } else
 257                         sorwakeup(last->in6p_socket);
 258         } else {
 259                 rip6stat.rip6s_nosock++;
 260                 if (m->m_flags & M_MCAST)
 261                         rip6stat.rip6s_nosockmcast++;
 262                 if (proto == IPPROTO_NONE)
 263                         m_freem(m);
 264                 else {
 265                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
 266                         icmp6_error(m, ICMP6_PARAM_PROB,
 267                                     ICMP6_PARAMPROB_NEXTHEADER,
 268                                     prvnxtp - mtod(m, char *));
 269                 }
 270                 ip6stat.ip6s_delivered--;
 271         }
 272
 273 unlock:
 274         lck_rw_done(ripcbinfo.ipi_lock);
 275
 276         return IPPROTO_DONE;
 277 }
 278
 279 void
 280 rip6_ctlinput(
 281         int cmd,
 282         struct sockaddr *sa,
 283         void *d)
 284 {
 285         struct ip6_hdr *ip6;
 286         struct mbuf *m;
 287         void *cmdarg = NULL;
 288         int off = 0;
 289         struct ip6ctlparam *ip6cp = NULL;
 290         const struct sockaddr_in6 *sa6_src = NULL;
 291         void (*notify)(struct inpcb *, int) = in6_rtchange;
 292
 293         if (sa->sa_family != AF_INET6 ||
 294             sa->sa_len != sizeof(struct sockaddr_in6))
 295                 return;
 296
 297         if ((unsigned)cmd >= PRC_NCMDS)
 298                 return;
 299         if (PRC_IS_REDIRECT(cmd))
 300                 notify = in6_rtchange, d = NULL;
 301         else if (cmd == PRC_HOSTDEAD)
 302                 d = NULL;
 303         else if (inet6ctlerrmap[cmd] == 0)
 304                 return;
 305
 306         /* if the parameter is from icmp6, decode it. */
 307         if (d != NULL) {
 308                 ip6cp = (struct ip6ctlparam *)d;
 309                 m = ip6cp->ip6c_m;
 310                 ip6 = ip6cp->ip6c_ip6;
 311                 off = ip6cp->ip6c_off;
 312                 cmdarg = ip6cp->ip6c_cmdarg;
 313                 sa6_src = ip6cp->ip6c_src;
 314         } else {
 315                 m = NULL;
 316                 ip6 = NULL;
 317                 sa6_src = &sa6_any;
 318         }
 319
 320         (void) in6_pcbnotify(&ripcbinfo, sa, 0, (const struct sockaddr *)sa6_src,
 321                              0, cmd, cmdarg, notify);
 322 }
 323
 324 /*
 325  * Generate IPv6 header and pass packet to ip6_output.
 326  * Tack on options user may have setup with control call.
 327  */
 328 int
 329 rip6_output(
 330         struct mbuf *m,
 331         struct socket *so,
 332         struct sockaddr_in6 *dstsock,
 333         struct mbuf *control,
 334         int israw)
 335 {
 336         struct in6_addr *dst;
 337         struct ip6_hdr *ip6;
 338         struct inpcb *in6p;
 339         u_int   plen = m->m_pkthdr.len;
 340         int error = 0;
 341         struct ip6_pktopts opt, *optp = NULL;
 342         struct ip6_moptions *im6o = NULL;
 343         struct ifnet *oifp = NULL;
 344         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
 345         mbuf_svc_class_t msc = MBUF_SC_UNSPEC;
 346         struct ip6_out_args ip6oa =
 347             { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF, 0 };
 348         int flags = IPV6_OUTARGS;
 349
 350         in6p = sotoin6pcb(so);
 351
 352         if (in6p == NULL
 353 #if NECP
 354                 || (necp_socket_should_use_flow_divert(in6p))
 355 #endif /* NECP */
 356                 ) {
 357                 if (in6p == NULL)
 358                         error = EINVAL;
 359                 else
 360                         error = EPROTOTYPE;
 361                 goto bad;
 362         }
 363         if (dstsock != NULL && IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
 364                 error = EINVAL;
 365                 goto bad;
 366         }
 367
 368         if (in6p->inp_flags & INP_BOUND_IF) {
 369                 ip6oa.ip6oa_boundif = in6p->inp_boundifp->if_index;
 370                 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
 371         }
 372         if (INP_NO_CELLULAR(in6p))
 373                 ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
 374         if (INP_NO_EXPENSIVE(in6p))
 375                 ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
 376         if (INP_AWDL_UNRESTRICTED(in6p))
 377                 ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
 378
 379         dst = &dstsock->sin6_addr;
 380         if (control) {
 381                 msc = mbuf_service_class_from_control(control);
 382
 383                 if ((error = ip6_setpktopts(control, &opt, NULL,
 384                     SOCK_PROTO(so))) != 0)
 385                         goto bad;
 386                 optp = &opt;
 387         } else
 388                 optp = in6p->in6p_outputopts;
 389
 390         /*
 391          * For an ICMPv6 packet, we should know its type and code
 392          * to update statistics.
 393          */
 394         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 395                 struct icmp6_hdr *icmp6;
 396                 if (m->m_len < sizeof(struct icmp6_hdr) &&
 397                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
 398                         error = ENOBUFS;
 399                         goto bad;
 400                 }
 401                 icmp6 = mtod(m, struct icmp6_hdr *);
 402                 type = icmp6->icmp6_type;
 403                 code = icmp6->icmp6_code;
 404         }
 405
 406         if (in6p->inp_flowhash == 0)
 407                 in6p->inp_flowhash = inp_calc_flowhash(in6p);
 408         /* update flowinfo - RFC 6437 */
 409         if (in6p->inp_flow == 0 && in6p->in6p_flags & IN6P_AUTOFLOWLABEL) {
 410                 in6p->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 411                 in6p->inp_flow |=
 412                     (htonl(in6p->inp_flowhash) & IPV6_FLOWLABEL_MASK);
 413         }
 414
 415         M_PREPEND(m, sizeof(*ip6), M_WAIT);
 416         if (m == NULL) {
 417                 error = ENOBUFS;
 418                 goto bad;
 419         }
 420         ip6 = mtod(m, struct ip6_hdr *);
 421
 422         /*
 423          * Next header might not be ICMP6 but use its pseudo header anyway.
 424          */
 425         ip6->ip6_dst = *dst;
 426
 427         im6o = in6p->in6p_moptions;
 428
 429         /*
 430          * If the scope of the destination is link-local, embed the interface
 431          * index in the address.
 432          *
 433          * XXX advanced-api value overrides sin6_scope_id
 434          */
 435         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 436                 struct in6_pktinfo *pi;
 437                 struct ifnet *im6o_multicast_ifp = NULL;
 438
 439                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && im6o != NULL) {
 440                         IM6O_LOCK(im6o);
 441                         im6o_multicast_ifp = im6o->im6o_multicast_ifp;
 442                         IM6O_UNLOCK(im6o);
 443                 }
 444                 /*
 445                  * XXX Boundary check is assumed to be already done in
 446                  * ip6_setpktoptions().
 447                  */
 448                 ifnet_head_lock_shared();
 449                 if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
 450                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
 451                         oifp = ifindex2ifnet[pi->ipi6_ifindex];
 452                         if (oifp != NULL)
 453                                 ifnet_reference(oifp);
 454                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 455                     im6o != NULL && im6o_multicast_ifp != NULL) {
 456                         oifp = im6o_multicast_ifp;
 457                         ifnet_reference(oifp);
 458                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
 459                 } else if (dstsock->sin6_scope_id) {
 460                         /*
 461                          * boundary check
 462                          *
 463                          * Sinced stsock->sin6_scope_id is unsigned, we don't
 464                          * need to check if it's < 0
 465                          */
 466                         if (if_index < dstsock->sin6_scope_id) {
 467                                 error = ENXIO;  /* XXX EINVAL? */
 468                                 ifnet_head_done();
 469                                 goto bad;
 470                         }
 471                         ip6->ip6_dst.s6_addr16[1]
 472                                 = htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
 473                 }
 474                 ifnet_head_done();
 475         }
 476
 477         /*
 478          * Source address selection.
 479          */
 480         {
 481                 struct in6_addr *in6a;
 482                 struct in6_addr storage;
 483                 u_short index = 0;
 484
 485                 if (israw != 0 && optp && optp->ip6po_pktinfo && !IN6_IS_ADDR_UNSPECIFIED(&optp->ip6po_pktinfo->ipi6_addr)) {
 486                         in6a = &optp->ip6po_pktinfo->ipi6_addr;
 487                         flags |= IPV6_FLAG_NOSRCIFSEL;
 488                 } else if ((in6a = in6_selectsrc(dstsock, optp, in6p,
 489                     &in6p->in6p_route, NULL, &storage, ip6oa.ip6oa_boundif,
 490                     &error)) == 0) {
 491                         if (error == 0)
 492                                 error = EADDRNOTAVAIL;
 493                         goto bad;
 494                 } else {
 495                         ip6oa.ip6oa_flags |= IP6OAF_BOUND_SRCADDR;
 496                 }
 497                 ip6->ip6_src = *in6a;
 498                 if (in6p->in6p_route.ro_rt != NULL) {
 499                         RT_LOCK(in6p->in6p_route.ro_rt);
 500                         if (in6p->in6p_route.ro_rt->rt_ifp != NULL)
 501                                 index = in6p->in6p_route.ro_rt->rt_ifp->if_index;
 502                         RT_UNLOCK(in6p->in6p_route.ro_rt);
 503                         if (oifp != NULL)
 504                                 ifnet_release(oifp);
 505                         ifnet_head_lock_shared();
 506                         if (index == 0 || if_index < index) {
 507                                 panic("bad if_index on interface from route");
 508                         }
 509                         oifp = ifindex2ifnet[index];
 510                         if (oifp != NULL)
 511                                 ifnet_reference(oifp);
 512                         ifnet_head_done();
 513                 }
 514         }
 515         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
 516                 (in6p->inp_flow & IPV6_FLOWINFO_MASK);
 517         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
 518                 (IPV6_VERSION & IPV6_VERSION_MASK);
 519         /* ip6_plen will be filled in ip6_output, so not fill it here. */
 520         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
 521         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
 522
 523         if (SOCK_PROTO(so) == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
 524                 struct mbuf *n;
 525                 int off;
 526                 u_int16_t *p;
 527
 528                 /* compute checksum */
 529                 if (SOCK_PROTO(so) == IPPROTO_ICMPV6)
 530                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
 531                 else
 532                         off = in6p->in6p_cksum;
 533                 if (plen < (unsigned int)(off + 1)) {
 534                         error = EINVAL;
 535                         goto bad;
 536                 }
 537                 off += sizeof(struct ip6_hdr);
 538
 539                 n = m;
 540                 while (n && n->m_len <= off) {
 541                         off -= n->m_len;
 542                         n = n->m_next;
 543                 }
 544                 if (!n)
 545                         goto bad;
 546                 p = (u_int16_t *)(void *)(mtod(n, caddr_t) + off);
 547                 *p = 0;
 548                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
 549         }
 550
 551 #if NECP
 552         {
 553                 necp_kernel_policy_id policy_id;
 554                 if (!necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0, &ip6->ip6_src, &ip6->ip6_dst, NULL, &policy_id)) {
 555                         error = EHOSTUNREACH;
 556                         goto bad;
 557                 }
 558
 559                 necp_mark_packet_from_socket(m, in6p, policy_id);
 560         }
 561 #endif /* NECP */
 562
 563 #if IPSEC
 564         if (in6p->in6p_sp != NULL && ipsec_setsocket(m, so) != 0) {
 565                 error = ENOBUFS;
 566                 goto bad;
 567         }
 568 #endif /*IPSEC*/
 569
 570         if (ROUTE_UNUSABLE(&in6p->in6p_route))
 571                 ROUTE_RELEASE(&in6p->in6p_route);
 572
 573         if (oifp != NULL) {
 574                 ifnet_release(oifp);
 575                 oifp = NULL;
 576         }
 577
 578         set_packet_service_class(m, so, msc, PKT_SCF_IPV6);
 579         m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB;
 580         m->m_pkthdr.pkt_flowid = in6p->inp_flowhash;
 581         m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC |
 582             PKTF_FLOW_RAWSOCK);
 583         m->m_pkthdr.pkt_proto = in6p->in6p_ip6_nxt;
 584
 585         if (im6o != NULL)
 586                 IM6O_ADDREF(im6o);
 587
 588         error = ip6_output(m, optp, &in6p->in6p_route, flags, im6o,
 589             &oifp, &ip6oa);
 590
 591         if (im6o != NULL)
 592                 IM6O_REMREF(im6o);
 593
 594         if (in6p->in6p_route.ro_rt != NULL) {
 595                 struct rtentry *rt = in6p->in6p_route.ro_rt;
 596                 struct ifnet *outif;
 597
 598                 if ((rt->rt_flags & RTF_MULTICAST) ||
 599                     in6p->in6p_socket == NULL ||
 600                     !(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
 601                         rt = NULL;      /* unusable */
 602                 }
 603                 /*
 604                  * Always discard the cached route for unconnected
 605                  * socket or if it is a multicast route.
 606                  */
 607                 if (rt == NULL)
 608                         ROUTE_RELEASE(&in6p->in6p_route);
 609
 610                 /*
 611                  * If this is a connected socket and the destination
 612                  * route is not multicast, update outif with that of
 613                  * the route interface index used by IP.
 614                  */
 615                 if (rt != NULL &&
 616                     (outif = rt->rt_ifp) != in6p->in6p_last_outifp)
 617                         in6p->in6p_last_outifp = outif;
 618         } else {
 619                 ROUTE_RELEASE(&in6p->in6p_route);
 620         }
 621
 622         /*
 623          * If output interface was cellular/expensive, and this socket is
 624          * denied access to it, generate an event.
 625          */
 626         if (error != 0 && (ip6oa.ip6oa_retflags & IP6OARF_IFDENIED) &&
 627             (INP_NO_CELLULAR(in6p) || INP_NO_EXPENSIVE(in6p)))
 628                 soevent(in6p->inp_socket, (SO_FILT_HINT_LOCKED|
 629                     SO_FILT_HINT_IFDENIED));
 630
 631         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 632                 if (oifp)
 633                         icmp6_ifoutstat_inc(oifp, type, code);
 634                 icmp6stat.icp6s_outhist[type]++;
 635         } else
 636                 rip6stat.rip6s_opackets++;
 637
 638         goto freectl;
 639
 640 bad:
 641         if (m != NULL)
 642                 m_freem(m);
 643
 644 freectl:
 645         if (optp == &opt && optp->ip6po_rthdr)
 646                 ROUTE_RELEASE(&optp->ip6po_route);
 647
 648         if (control != NULL) {
 649                 if (optp == &opt)
 650                         ip6_clearpktopts(optp, -1);
 651                 m_freem(control);
 652         }
 653         if (oifp != NULL)
 654                 ifnet_release(oifp);
 655         return(error);
 656 }
 657
 658 #if IPFW2
 659 __private_extern__ void
 660 load_ip6fw(void)
 661 {
 662         ip6_fw_init();
 663 }
 664 #endif
 665
 666 /*
 667  * Raw IPv6 socket option processing.
 668  */
 669 int
 670 rip6_ctloutput(
 671         struct socket *so,
 672         struct sockopt *sopt)
 673 {
 674         int error, optval;
 675
 676         /* Allow <SOL_SOCKET,SO_FLUSH> at this level */
 677         if (sopt->sopt_level == IPPROTO_ICMPV6)
 678                 /*
 679                  * XXX: is it better to call icmp6_ctloutput() directly
 680                  * from protosw?
 681                  */
 682                 return(icmp6_ctloutput(so, sopt));
 683         else if (sopt->sopt_level != IPPROTO_IPV6 &&
 684             !(sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_FLUSH))
 685                 return (EINVAL);
 686
 687         error = 0;
 688
 689         switch (sopt->sopt_dir) {
 690         case SOPT_GET:
 691                 switch (sopt->sopt_name) {
 692 #if IPFW2
 693                 case IPV6_FW_ADD:
 694                 case IPV6_FW_GET:
 695                         if (ip6_fw_ctl_ptr == 0)
 696                                 load_ip6fw();
 697                         if (ip6_fw_ctl_ptr)
 698                                 error = ip6_fw_ctl_ptr(sopt);
 699                         else
 700                                 error = ENOPROTOOPT;
 701                         break;
 702 #endif
 703                 case IPV6_CHECKSUM:
 704                         error = ip6_raw_ctloutput(so, sopt);
 705                         break;
 706                 default:
 707                         error = ip6_ctloutput(so, sopt);
 708                         break;
 709                 }
 710                 break;
 711
 712         case SOPT_SET:
 713                 switch (sopt->sopt_name) {
 714 #if IPFW2
 715                 case IPV6_FW_ADD:
 716                 case IPV6_FW_DEL:
 717                 case IPV6_FW_FLUSH:
 718                 case IPV6_FW_ZERO:
 719                         if (ip6_fw_ctl_ptr == 0)
 720                                 load_ip6fw();
 721                         if (ip6_fw_ctl_ptr)
 722                                 error = ip6_fw_ctl_ptr(sopt);
 723                         else
 724                                 error = ENOPROTOOPT;
 725                         break;
 726 #endif
 727
 728                 case IPV6_CHECKSUM:
 729                         error = ip6_raw_ctloutput(so, sopt);
 730                         break;
 731
 732                 case SO_FLUSH:
 733                         if ((error = sooptcopyin(sopt, &optval, sizeof (optval),
 734                             sizeof (optval))) != 0)
 735                                 break;
 736
 737                         error = inp_flush(sotoinpcb(so), optval);
 738                         break;
 739
 740                 default:
 741                         error = ip6_ctloutput(so, sopt);
 742                         break;
 743                 }
 744                 break;
 745         }
 746
 747         return (error);
 748 }
 749
 750 static int
 751 rip6_attach(struct socket *so, int proto, struct proc *p)
 752 {
 753         struct inpcb *inp;
 754         int error;
 755
 756         inp = sotoinpcb(so);
 757         if (inp)
 758                 panic("rip6_attach");
 759         if ((error = proc_suser(p)) != 0)
 760                 return error;
 761
 762         error = soreserve(so, rip_sendspace, rip_recvspace);
 763         if (error)
 764                 return error;
 765         error = in_pcballoc(so, &ripcbinfo, p);
 766         if (error)
 767                 return error;
 768         inp = (struct inpcb *)so->so_pcb;
 769         inp->inp_vflag |= INP_IPV6;
 770         inp->in6p_ip6_nxt = (char)proto;
 771         inp->in6p_hops = -1;    /* use kernel default */
 772         inp->in6p_cksum = -1;
 773         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
 774                sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
 775         if (inp->in6p_icmp6filt == NULL)
 776                 return (ENOMEM);
 777         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
 778         return 0;
 779 }
 780
 781 static int
 782 rip6_detach(struct socket *so)
 783 {
 784         struct inpcb *inp;
 785
 786         inp = sotoinpcb(so);
 787         if (inp == 0)
 788                 panic("rip6_detach");
 789         /* xxx: RSVP */
 790         if (inp->in6p_icmp6filt) {
 791                 FREE(inp->in6p_icmp6filt, M_PCB);
 792                 inp->in6p_icmp6filt = NULL;
 793         }
 794         in6_pcbdetach(inp);
 795         return 0;
 796 }
 797
 798 static int
 799 rip6_abort(struct socket *so)
 800 {
 801         soisdisconnected(so);
 802         return rip6_detach(so);
 803 }
 804
 805 static int
 806 rip6_disconnect(struct socket *so)
 807 {
 808         struct inpcb *inp = sotoinpcb(so);
 809
 810         if ((so->so_state & SS_ISCONNECTED) == 0)
 811                 return ENOTCONN;
 812         inp->in6p_faddr = in6addr_any;
 813         return rip6_abort(so);
 814 }
 815
 816 static int
 817 rip6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
 818 {
 819 #pragma unused(p)
 820         struct inpcb *inp = sotoinpcb(so);
 821         struct sockaddr_in6 sin6;
 822         struct ifaddr *ifa = NULL;
 823         struct ifnet *outif = NULL;
 824         int error;
 825
 826         if (inp == NULL
 827 #if NECP
 828                 || (necp_socket_should_use_flow_divert(inp))
 829 #endif /* NECP */
 830                 )
 831                 return (inp == NULL ? EINVAL : EPROTOTYPE);
 832
 833         if (nam->sa_len != sizeof (struct sockaddr_in6))
 834                 return (EINVAL);
 835
 836         if (TAILQ_EMPTY(&ifnet_head) || SIN6(nam)->sin6_family != AF_INET6)
 837                 return (EADDRNOTAVAIL);
 838
 839         bzero(&sin6, sizeof (sin6));
 840         *(&sin6) = *SIN6(nam);
 841
 842         if ((error = sa6_embedscope(&sin6, ip6_use_defzone)) != 0)
 843                 return (error);
 844
 845         /* Sanitize local copy for address searches */
 846         sin6.sin6_flowinfo = 0;
 847         sin6.sin6_scope_id = 0;
 848         sin6.sin6_port = 0;
 849
 850         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) &&
 851             (ifa = ifa_ifwithaddr(SA(&sin6))) == 0)
 852                 return (EADDRNOTAVAIL);
 853         if (ifa != NULL) {
 854                 IFA_LOCK(ifa);
 855                 if (((struct in6_ifaddr *)ifa)->ia6_flags &
 856                     (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
 857                      IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
 858                         IFA_UNLOCK(ifa);
 859                         IFA_REMREF(ifa);
 860                         return (EADDRNOTAVAIL);
 861                 }
 862                 outif = ifa->ifa_ifp;
 863                 IFA_UNLOCK(ifa);
 864                 IFA_REMREF(ifa);
 865         }
 866         inp->in6p_laddr = sin6.sin6_addr;
 867         inp->in6p_last_outifp = outif;
 868         return (0);
 869 }
 870
 871 static int
 872 rip6_connect(struct socket *so, struct sockaddr *nam, __unused struct proc *p)
 873 {
 874         struct inpcb *inp = sotoinpcb(so);
 875         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(void *)nam;
 876         struct in6_addr *in6a = NULL;
 877         struct in6_addr storage;
 878         int error = 0;
 879 #if ENABLE_DEFAULT_SCOPE
 880         struct sockaddr_in6 tmp;
 881 #endif
 882         unsigned int ifscope;
 883         struct ifnet *outif = NULL;
 884
 885         if (inp == NULL
 886 #if NECP
 887                 || (necp_socket_should_use_flow_divert(inp))
 888 #endif /* NECP */
 889                 )
 890                 return (inp == NULL ? EINVAL : EPROTOTYPE);
 891         if (nam->sa_len != sizeof(*addr))
 892                 return EINVAL;
 893         if (TAILQ_EMPTY(&ifnet_head))
 894                 return EADDRNOTAVAIL;
 895         if (addr->sin6_family != AF_INET6)
 896                 return EAFNOSUPPORT;
 897 #if ENABLE_DEFAULT_SCOPE
 898         if (addr->sin6_scope_id == 0) { /* not change if specified  */
 899                 /* avoid overwrites */
 900                 tmp = *addr;
 901                 addr = &tmp;
 902                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
 903         }
 904 #endif
 905
 906         ifscope = (inp->inp_flags & INP_BOUND_IF) ?
 907             inp->inp_boundifp->if_index : IFSCOPE_NONE;
 908
 909         /* Source address selection. XXX: need pcblookup? */
 910         in6a = in6_selectsrc(addr, inp->in6p_outputopts, inp, &inp->in6p_route,
 911             NULL, &storage, ifscope, &error);
 912         if (in6a == NULL)
 913                 return (error ? error : EADDRNOTAVAIL);
 914         inp->in6p_laddr = *in6a;
 915         inp->in6p_faddr = addr->sin6_addr;
 916         if (inp->in6p_route.ro_rt != NULL)
 917                 outif = inp->in6p_route.ro_rt->rt_ifp;
 918         inp->in6p_last_outifp = outif;
 919         soisconnected(so);
 920         return 0;
 921 }
 922
 923 static int
 924 rip6_shutdown(struct socket *so)
 925 {
 926         socantsendmore(so);
 927         return 0;
 928 }
 929
 930 static int
 931 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 932     struct mbuf *control, struct proc *p)
 933 {
 934 #pragma unused(flags, p)
 935         struct inpcb *inp = sotoinpcb(so);
 936         struct sockaddr_in6 tmp;
 937         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam;
 938         int error = 0;
 939
 940         if (inp == NULL
 941 #if NECP
 942                 || (necp_socket_should_use_flow_divert(inp))
 943 #endif /* NECP */
 944                 ) {
 945                 if (inp == NULL)
 946                         error = EINVAL;
 947                 else
 948                         error = EPROTOTYPE;
 949                 goto bad;
 950         }
 951
 952         /* always copy sockaddr to avoid overwrites */
 953         if (so->so_state & SS_ISCONNECTED) {
 954                 if (nam != NULL) {
 955                         error = EISCONN;
 956                         goto bad;
 957                 }
 958                 /* XXX */
 959                 bzero(&tmp, sizeof(tmp));
 960                 tmp.sin6_family = AF_INET6;
 961                 tmp.sin6_len = sizeof(struct sockaddr_in6);
 962                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
 963                       sizeof(struct in6_addr));
 964                 dst = &tmp;
 965         } else {
 966                 if (nam == NULL) {
 967                         error = ENOTCONN;
 968                         goto bad;
 969                 }
 970                 tmp = *(struct sockaddr_in6 *)(void *)nam;
 971                 dst = &tmp;
 972         }
 973 #if ENABLE_DEFAULT_SCOPE
 974         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
 975                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
 976         }
 977 #endif
 978         return (rip6_output(m, so, dst, control, 1));
 979
 980 bad:
 981         VERIFY(error != 0);
 982
 983         if (m != NULL)
 984                 m_freem(m);
 985         if (control != NULL)
 986                 m_freem(control);
 987
 988         return (error);
 989 }
 990
 991 struct pr_usrreqs rip6_usrreqs = {
 992         .pru_abort =            rip6_abort,
 993         .pru_attach =           rip6_attach,
 994         .pru_bind =             rip6_bind,
 995         .pru_connect =          rip6_connect,
 996         .pru_control =          in6_control,
 997         .pru_detach =           rip6_detach,
 998         .pru_disconnect =       rip6_disconnect,
 999         .pru_peeraddr =         in6_getpeeraddr,
1000         .pru_send =             rip6_send,
1001         .pru_shutdown =         rip6_shutdown,
1002         .pru_sockaddr =         in6_getsockaddr,
1003         .pru_sosend =           sosend,
1004         .pru_soreceive =        soreceive,
1005 };
1006
1007 __private_extern__ struct pr_usrreqs icmp6_dgram_usrreqs = {
1008         .pru_abort =            rip6_abort,
1009         .pru_attach =           icmp6_dgram_attach,
1010         .pru_bind =             rip6_bind,
1011         .pru_connect =          rip6_connect,
1012         .pru_control =          in6_control,
1013         .pru_detach =           rip6_detach,
1014         .pru_disconnect =       rip6_disconnect,
1015         .pru_peeraddr =         in6_getpeeraddr,
1016         .pru_send =             icmp6_dgram_send,
1017         .pru_shutdown =         rip6_shutdown,
1018         .pru_sockaddr =         in6_getsockaddr,
1019         .pru_sosend =           sosend,
1020         .pru_soreceive =        soreceive,
1021 };