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,
 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, d = NULL;
 303         else if (cmd == PRC_HOSTDEAD)
 304                 d = NULL;
 305         else if (inet6ctlerrmap[cmd] == 0)
 306                 return;
 307
 308         /* if the parameter is from icmp6, decode it. */
 309         if (d != NULL) {
 310                 ip6cp = (struct ip6ctlparam *)d;
 311                 m = ip6cp->ip6c_m;
 312                 ip6 = ip6cp->ip6c_ip6;
 313                 off = ip6cp->ip6c_off;
 314                 cmdarg = ip6cp->ip6c_cmdarg;
 315                 sa6_src = ip6cp->ip6c_src;
 316         } else {
 317                 m = NULL;
 318                 ip6 = NULL;
 319                 sa6_src = &sa6_any;
 320         }
 321
 322         (void) in6_pcbnotify(&ripcbinfo, sa, 0, (const struct sockaddr *)sa6_src,
 323                              0, cmd, cmdarg, notify);
 324 }
 325
 326 /*
 327  * Generate IPv6 header and pass packet to ip6_output.
 328  * Tack on options user may have setup with control call.
 329  */
 330 int
 331 rip6_output(
 332         struct mbuf *m,
 333         struct socket *so,
 334         struct sockaddr_in6 *dstsock,
 335         struct mbuf *control,
 336         int israw)
 337 {
 338         struct in6_addr *dst;
 339         struct ip6_hdr *ip6;
 340         struct inpcb *in6p;
 341         u_int   plen = m->m_pkthdr.len;
 342         int error = 0;
 343         struct ip6_pktopts opt, *optp = NULL;
 344         struct ip6_moptions *im6o = NULL;
 345         struct ifnet *oifp = NULL;
 346         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
 347         mbuf_svc_class_t msc = MBUF_SC_UNSPEC;
 348         struct ip6_out_args ip6oa =
 349             { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF, 0 };
 350         int flags = IPV6_OUTARGS;
 351
 352         in6p = sotoin6pcb(so);
 353
 354         if (in6p == NULL
 355 #if NECP
 356                 || (necp_socket_should_use_flow_divert(in6p))
 357 #endif /* NECP */
 358                 ) {
 359                 if (in6p == NULL)
 360                         error = EINVAL;
 361                 else
 362                         error = EPROTOTYPE;
 363                 goto bad;
 364         }
 365         if (dstsock != NULL && IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
 366                 error = EINVAL;
 367                 goto bad;
 368         }
 369
 370         if (in6p->inp_flags & INP_BOUND_IF) {
 371                 ip6oa.ip6oa_boundif = in6p->inp_boundifp->if_index;
 372                 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
 373         }
 374         if (INP_NO_CELLULAR(in6p))
 375                 ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
 376         if (INP_NO_EXPENSIVE(in6p))
 377                 ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
 378         if (INP_AWDL_UNRESTRICTED(in6p))
 379                 ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
 380
 381         dst = &dstsock->sin6_addr;
 382         if (control) {
 383                 msc = mbuf_service_class_from_control(control);
 384
 385                 if ((error = ip6_setpktopts(control, &opt, NULL,
 386                     SOCK_PROTO(so))) != 0)
 387                         goto bad;
 388                 optp = &opt;
 389         } else
 390                 optp = in6p->in6p_outputopts;
 391
 392         /*
 393          * For an ICMPv6 packet, we should know its type and code
 394          * to update statistics.
 395          */
 396         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 397                 struct icmp6_hdr *icmp6;
 398                 if (m->m_len < sizeof(struct icmp6_hdr) &&
 399                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
 400                         error = ENOBUFS;
 401                         goto bad;
 402                 }
 403                 icmp6 = mtod(m, struct icmp6_hdr *);
 404                 type = icmp6->icmp6_type;
 405                 code = icmp6->icmp6_code;
 406         }
 407
 408         if (in6p->inp_flowhash == 0)
 409                 in6p->inp_flowhash = inp_calc_flowhash(in6p);
 410         /* update flowinfo - RFC 6437 */
 411         if (in6p->inp_flow == 0 && in6p->in6p_flags & IN6P_AUTOFLOWLABEL) {
 412                 in6p->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 413                 in6p->inp_flow |=
 414                     (htonl(in6p->inp_flowhash) & IPV6_FLOWLABEL_MASK);
 415         }
 416
 417         M_PREPEND(m, sizeof(*ip6), M_WAIT, 1);
 418         if (m == NULL) {
 419                 error = ENOBUFS;
 420                 goto bad;
 421         }
 422         ip6 = mtod(m, struct ip6_hdr *);
 423
 424         /*
 425          * Next header might not be ICMP6 but use its pseudo header anyway.
 426          */
 427         ip6->ip6_dst = *dst;
 428
 429         im6o = in6p->in6p_moptions;
 430
 431         /*
 432          * If the scope of the destination is link-local, embed the interface
 433          * index in the address.
 434          *
 435          * XXX advanced-api value overrides sin6_scope_id
 436          */
 437         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 438                 struct in6_pktinfo *pi;
 439                 struct ifnet *im6o_multicast_ifp = NULL;
 440
 441                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && im6o != NULL) {
 442                         IM6O_LOCK(im6o);
 443                         im6o_multicast_ifp = im6o->im6o_multicast_ifp;
 444                         IM6O_UNLOCK(im6o);
 445                 }
 446                 /*
 447                  * XXX Boundary check is assumed to be already done in
 448                  * ip6_setpktoptions().
 449                  */
 450                 ifnet_head_lock_shared();
 451                 if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
 452                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
 453                         oifp = ifindex2ifnet[pi->ipi6_ifindex];
 454                         if (oifp != NULL)
 455                                 ifnet_reference(oifp);
 456                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 457                     im6o != NULL && im6o_multicast_ifp != NULL) {
 458                         oifp = im6o_multicast_ifp;
 459                         ifnet_reference(oifp);
 460                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
 461                 } else if (dstsock->sin6_scope_id) {
 462                         /*
 463                          * boundary check
 464                          *
 465                          * Sinced stsock->sin6_scope_id is unsigned, we don't
 466                          * need to check if it's < 0
 467                          */
 468                         if (if_index < dstsock->sin6_scope_id) {
 469                                 error = ENXIO;  /* XXX EINVAL? */
 470                                 ifnet_head_done();
 471                                 goto bad;
 472                         }
 473                         ip6->ip6_dst.s6_addr16[1]
 474                                 = htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
 475                 }
 476                 ifnet_head_done();
 477         }
 478
 479         /*
 480          * Source address selection.
 481          */
 482         {
 483                 struct in6_addr *in6a;
 484                 struct in6_addr storage;
 485                 u_short index = 0;
 486
 487                 if (israw != 0 && optp && optp->ip6po_pktinfo && !IN6_IS_ADDR_UNSPECIFIED(&optp->ip6po_pktinfo->ipi6_addr)) {
 488                         in6a = &optp->ip6po_pktinfo->ipi6_addr;
 489                         flags |= IPV6_FLAG_NOSRCIFSEL;
 490                 } else if ((in6a = in6_selectsrc(dstsock, optp, in6p,
 491                     &in6p->in6p_route, NULL, &storage, ip6oa.ip6oa_boundif,
 492                     &error)) == 0) {
 493                         if (error == 0)
 494                                 error = EADDRNOTAVAIL;
 495                         goto bad;
 496                 } else {
 497                         ip6oa.ip6oa_flags |= IP6OAF_BOUND_SRCADDR;
 498                 }
 499                 ip6->ip6_src = *in6a;
 500                 if (in6p->in6p_route.ro_rt != NULL) {
 501                         RT_LOCK(in6p->in6p_route.ro_rt);
 502                         if (in6p->in6p_route.ro_rt->rt_ifp != NULL)
 503                                 index = in6p->in6p_route.ro_rt->rt_ifp->if_index;
 504                         RT_UNLOCK(in6p->in6p_route.ro_rt);
 505                         if (oifp != NULL)
 506                                 ifnet_release(oifp);
 507                         ifnet_head_lock_shared();
 508                         if (index == 0 || if_index < index) {
 509                                 panic("bad if_index on interface from route");
 510                         }
 511                         oifp = ifindex2ifnet[index];
 512                         if (oifp != NULL)
 513                                 ifnet_reference(oifp);
 514                         ifnet_head_done();
 515                 }
 516         }
 517         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
 518                 (in6p->inp_flow & IPV6_FLOWINFO_MASK);
 519         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
 520                 (IPV6_VERSION & IPV6_VERSION_MASK);
 521         /* ip6_plen will be filled in ip6_output, so not fill it here. */
 522         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
 523         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
 524
 525         if (SOCK_PROTO(so) == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
 526                 struct mbuf *n;
 527                 int off;
 528                 u_int16_t *p;
 529
 530                 /* compute checksum */
 531                 if (SOCK_PROTO(so) == IPPROTO_ICMPV6)
 532                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
 533                 else
 534                         off = in6p->in6p_cksum;
 535                 if (plen < (unsigned int)(off + 1)) {
 536                         error = EINVAL;
 537                         goto bad;
 538                 }
 539                 off += sizeof(struct ip6_hdr);
 540
 541                 n = m;
 542                 while (n && n->m_len <= off) {
 543                         off -= n->m_len;
 544                         n = n->m_next;
 545                 }
 546                 if (!n)
 547                         goto bad;
 548                 p = (u_int16_t *)(void *)(mtod(n, caddr_t) + off);
 549                 *p = 0;
 550                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
 551         }
 552
 553 #if NECP
 554         {
 555                 necp_kernel_policy_id policy_id;
 556                 u_int32_t route_rule_id;
 557                 if (!necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 558                         &ip6->ip6_src, &ip6->ip6_dst, NULL, &policy_id, &route_rule_id)) {
 559                         error = EHOSTUNREACH;
 560                         goto bad;
 561                 }
 562
 563                 necp_mark_packet_from_socket(m, in6p, policy_id, route_rule_id);
 564         }
 565 #endif /* NECP */
 566
 567 #if IPSEC
 568         if (in6p->in6p_sp != NULL && ipsec_setsocket(m, so) != 0) {
 569                 error = ENOBUFS;
 570                 goto bad;
 571         }
 572 #endif /*IPSEC*/
 573
 574         if (ROUTE_UNUSABLE(&in6p->in6p_route))
 575                 ROUTE_RELEASE(&in6p->in6p_route);
 576
 577         if (oifp != NULL) {
 578                 ifnet_release(oifp);
 579                 oifp = NULL;
 580         }
 581
 582         set_packet_service_class(m, so, msc, PKT_SCF_IPV6);
 583         m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB;
 584         m->m_pkthdr.pkt_flowid = in6p->inp_flowhash;
 585         m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC |
 586             PKTF_FLOW_RAWSOCK);
 587         m->m_pkthdr.pkt_proto = in6p->in6p_ip6_nxt;
 588
 589         if (im6o != NULL)
 590                 IM6O_ADDREF(im6o);
 591
 592         error = ip6_output(m, optp, &in6p->in6p_route, flags, im6o,
 593             &oifp, &ip6oa);
 594
 595         if (im6o != NULL)
 596                 IM6O_REMREF(im6o);
 597
 598         if (in6p->in6p_route.ro_rt != NULL) {
 599                 struct rtentry *rt = in6p->in6p_route.ro_rt;
 600                 struct ifnet *outif;
 601
 602                 if ((rt->rt_flags & RTF_MULTICAST) ||
 603                     in6p->in6p_socket == NULL ||
 604                     !(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
 605                         rt = NULL;      /* unusable */
 606                 }
 607                 /*
 608                  * Always discard the cached route for unconnected
 609                  * socket or if it is a multicast route.
 610                  */
 611                 if (rt == NULL)
 612                         ROUTE_RELEASE(&in6p->in6p_route);
 613
 614                 /*
 615                  * If this is a connected socket and the destination
 616                  * route is not multicast, update outif with that of
 617                  * the route interface index used by IP.
 618                  */
 619                 if (rt != NULL &&
 620                     (outif = rt->rt_ifp) != in6p->in6p_last_outifp)
 621                         in6p->in6p_last_outifp = outif;
 622         } else {
 623                 ROUTE_RELEASE(&in6p->in6p_route);
 624         }
 625
 626         /*
 627          * If output interface was cellular/expensive, and this socket is
 628          * denied access to it, generate an event.
 629          */
 630         if (error != 0 && (ip6oa.ip6oa_retflags & IP6OARF_IFDENIED) &&
 631             (INP_NO_CELLULAR(in6p) || INP_NO_EXPENSIVE(in6p)))
 632                 soevent(in6p->inp_socket, (SO_FILT_HINT_LOCKED|
 633                     SO_FILT_HINT_IFDENIED));
 634
 635         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 636                 if (oifp)
 637                         icmp6_ifoutstat_inc(oifp, type, code);
 638                 icmp6stat.icp6s_outhist[type]++;
 639         } else
 640                 rip6stat.rip6s_opackets++;
 641
 642         goto freectl;
 643
 644 bad:
 645         if (m != NULL)
 646                 m_freem(m);
 647
 648 freectl:
 649         if (optp == &opt && optp->ip6po_rthdr)
 650                 ROUTE_RELEASE(&optp->ip6po_route);
 651
 652         if (control != NULL) {
 653                 if (optp == &opt)
 654                         ip6_clearpktopts(optp, -1);
 655                 m_freem(control);
 656         }
 657         if (oifp != NULL)
 658                 ifnet_release(oifp);
 659         return(error);
 660 }
 661
 662 #if IPFW2
 663 __private_extern__ void
 664 load_ip6fw(void)
 665 {
 666         ip6_fw_init();
 667 }
 668 #endif
 669
 670 /*
 671  * Raw IPv6 socket option processing.
 672  */
 673 int
 674 rip6_ctloutput(
 675         struct socket *so,
 676         struct sockopt *sopt)
 677 {
 678         int error, optval;
 679
 680         /* Allow <SOL_SOCKET,SO_FLUSH> at this level */
 681         if (sopt->sopt_level == IPPROTO_ICMPV6)
 682                 /*
 683                  * XXX: is it better to call icmp6_ctloutput() directly
 684                  * from protosw?
 685                  */
 686                 return(icmp6_ctloutput(so, sopt));
 687         else if (sopt->sopt_level != IPPROTO_IPV6 &&
 688             !(sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_FLUSH))
 689                 return (EINVAL);
 690
 691         error = 0;
 692
 693         switch (sopt->sopt_dir) {
 694         case SOPT_GET:
 695                 switch (sopt->sopt_name) {
 696 #if IPFW2
 697                 case IPV6_FW_ADD:
 698                 case IPV6_FW_GET:
 699                         if (ip6_fw_ctl_ptr == 0)
 700                                 load_ip6fw();
 701                         if (ip6_fw_ctl_ptr)
 702                                 error = ip6_fw_ctl_ptr(sopt);
 703                         else
 704                                 error = ENOPROTOOPT;
 705                         break;
 706 #endif
 707                 case IPV6_CHECKSUM:
 708                         error = ip6_raw_ctloutput(so, sopt);
 709                         break;
 710                 default:
 711                         error = ip6_ctloutput(so, sopt);
 712                         break;
 713                 }
 714                 break;
 715
 716         case SOPT_SET:
 717                 switch (sopt->sopt_name) {
 718 #if IPFW2
 719                 case IPV6_FW_ADD:
 720                 case IPV6_FW_DEL:
 721                 case IPV6_FW_FLUSH:
 722                 case IPV6_FW_ZERO:
 723                         if (ip6_fw_ctl_ptr == 0)
 724                                 load_ip6fw();
 725                         if (ip6_fw_ctl_ptr)
 726                                 error = ip6_fw_ctl_ptr(sopt);
 727                         else
 728                                 error = ENOPROTOOPT;
 729                         break;
 730 #endif
 731
 732                 case IPV6_CHECKSUM:
 733                         error = ip6_raw_ctloutput(so, sopt);
 734                         break;
 735
 736                 case SO_FLUSH:
 737                         if ((error = sooptcopyin(sopt, &optval, sizeof (optval),
 738                             sizeof (optval))) != 0)
 739                                 break;
 740
 741                         error = inp_flush(sotoinpcb(so), optval);
 742                         break;
 743
 744                 default:
 745                         error = ip6_ctloutput(so, sopt);
 746                         break;
 747                 }
 748                 break;
 749         }
 750
 751         return (error);
 752 }
 753
 754 static int
 755 rip6_attach(struct socket *so, int proto, struct proc *p)
 756 {
 757         struct inpcb *inp;
 758         int error;
 759
 760         inp = sotoinpcb(so);
 761         if (inp)
 762                 panic("rip6_attach");
 763         if ((error = proc_suser(p)) != 0)
 764                 return error;
 765
 766         error = soreserve(so, rip_sendspace, rip_recvspace);
 767         if (error)
 768                 return error;
 769         error = in_pcballoc(so, &ripcbinfo, p);
 770         if (error)
 771                 return error;
 772         inp = (struct inpcb *)so->so_pcb;
 773         inp->inp_vflag |= INP_IPV6;
 774         inp->in6p_ip6_nxt = (char)proto;
 775         inp->in6p_hops = -1;    /* use kernel default */
 776         inp->in6p_cksum = -1;
 777         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
 778                sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
 779         if (inp->in6p_icmp6filt == NULL)
 780                 return (ENOMEM);
 781         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
 782         return 0;
 783 }
 784
 785 static int
 786 rip6_detach(struct socket *so)
 787 {
 788         struct inpcb *inp;
 789
 790         inp = sotoinpcb(so);
 791         if (inp == 0)
 792                 panic("rip6_detach");
 793         /* xxx: RSVP */
 794         if (inp->in6p_icmp6filt) {
 795                 FREE(inp->in6p_icmp6filt, M_PCB);
 796                 inp->in6p_icmp6filt = NULL;
 797         }
 798         in6_pcbdetach(inp);
 799         return 0;
 800 }
 801
 802 static int
 803 rip6_abort(struct socket *so)
 804 {
 805         soisdisconnected(so);
 806         return rip6_detach(so);
 807 }
 808
 809 static int
 810 rip6_disconnect(struct socket *so)
 811 {
 812         struct inpcb *inp = sotoinpcb(so);
 813
 814         if ((so->so_state & SS_ISCONNECTED) == 0)
 815                 return ENOTCONN;
 816         inp->in6p_faddr = in6addr_any;
 817         return rip6_abort(so);
 818 }
 819
 820 static int
 821 rip6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
 822 {
 823 #pragma unused(p)
 824         struct inpcb *inp = sotoinpcb(so);
 825         struct sockaddr_in6 sin6;
 826         struct ifaddr *ifa = NULL;
 827         struct ifnet *outif = NULL;
 828         int error;
 829
 830         if (inp == NULL
 831 #if NECP
 832                 || (necp_socket_should_use_flow_divert(inp))
 833 #endif /* NECP */
 834                 )
 835                 return (inp == NULL ? EINVAL : EPROTOTYPE);
 836
 837         if (nam->sa_len != sizeof (struct sockaddr_in6))
 838                 return (EINVAL);
 839
 840         if (TAILQ_EMPTY(&ifnet_head) || SIN6(nam)->sin6_family != AF_INET6)
 841                 return (EADDRNOTAVAIL);
 842
 843         bzero(&sin6, sizeof (sin6));
 844         *(&sin6) = *SIN6(nam);
 845
 846         if ((error = sa6_embedscope(&sin6, ip6_use_defzone)) != 0)
 847                 return (error);
 848
 849         /* Sanitize local copy for address searches */
 850         sin6.sin6_flowinfo = 0;
 851         sin6.sin6_scope_id = 0;
 852         sin6.sin6_port = 0;
 853
 854         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) &&
 855             (ifa = ifa_ifwithaddr(SA(&sin6))) == 0)
 856                 return (EADDRNOTAVAIL);
 857         if (ifa != NULL) {
 858                 IFA_LOCK(ifa);
 859                 if (((struct in6_ifaddr *)ifa)->ia6_flags &
 860                     (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
 861                      IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
 862                         IFA_UNLOCK(ifa);
 863                         IFA_REMREF(ifa);
 864                         return (EADDRNOTAVAIL);
 865                 }
 866                 outif = ifa->ifa_ifp;
 867                 IFA_UNLOCK(ifa);
 868                 IFA_REMREF(ifa);
 869         }
 870         inp->in6p_laddr = sin6.sin6_addr;
 871         inp->in6p_last_outifp = outif;
 872         return (0);
 873 }
 874
 875 static int
 876 rip6_connect(struct socket *so, struct sockaddr *nam, __unused struct proc *p)
 877 {
 878         struct inpcb *inp = sotoinpcb(so);
 879         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(void *)nam;
 880         struct in6_addr *in6a = NULL;
 881         struct in6_addr storage;
 882         int error = 0;
 883 #if ENABLE_DEFAULT_SCOPE
 884         struct sockaddr_in6 tmp;
 885 #endif
 886         unsigned int ifscope;
 887         struct ifnet *outif = NULL;
 888
 889         if (inp == NULL
 890 #if NECP
 891                 || (necp_socket_should_use_flow_divert(inp))
 892 #endif /* NECP */
 893                 )
 894                 return (inp == NULL ? EINVAL : EPROTOTYPE);
 895         if (nam->sa_len != sizeof(*addr))
 896                 return EINVAL;
 897         if (TAILQ_EMPTY(&ifnet_head))
 898                 return EADDRNOTAVAIL;
 899         if (addr->sin6_family != AF_INET6)
 900                 return EAFNOSUPPORT;
 901 #if ENABLE_DEFAULT_SCOPE
 902         if (addr->sin6_scope_id == 0) { /* not change if specified  */
 903                 /* avoid overwrites */
 904                 tmp = *addr;
 905                 addr = &tmp;
 906                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
 907         }
 908 #endif
 909
 910         ifscope = (inp->inp_flags & INP_BOUND_IF) ?
 911             inp->inp_boundifp->if_index : IFSCOPE_NONE;
 912
 913         /* Source address selection. XXX: need pcblookup? */
 914         in6a = in6_selectsrc(addr, inp->in6p_outputopts, inp, &inp->in6p_route,
 915             NULL, &storage, ifscope, &error);
 916         if (in6a == NULL)
 917                 return (error ? error : EADDRNOTAVAIL);
 918         inp->in6p_laddr = *in6a;
 919         inp->in6p_faddr = addr->sin6_addr;
 920         if (inp->in6p_route.ro_rt != NULL)
 921                 outif = inp->in6p_route.ro_rt->rt_ifp;
 922         inp->in6p_last_outifp = outif;
 923         soisconnected(so);
 924         return 0;
 925 }
 926
 927 static int
 928 rip6_shutdown(struct socket *so)
 929 {
 930         socantsendmore(so);
 931         return 0;
 932 }
 933
 934 static int
 935 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 936     struct mbuf *control, struct proc *p)
 937 {
 938 #pragma unused(flags, p)
 939         struct inpcb *inp = sotoinpcb(so);
 940         struct sockaddr_in6 tmp;
 941         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam;
 942         int error = 0;
 943
 944         if (inp == NULL
 945 #if NECP
 946                 || (necp_socket_should_use_flow_divert(inp))
 947 #endif /* NECP */
 948                 ) {
 949                 if (inp == NULL)
 950                         error = EINVAL;
 951                 else
 952                         error = EPROTOTYPE;
 953                 goto bad;
 954         }
 955
 956         /* always copy sockaddr to avoid overwrites */
 957         if (so->so_state & SS_ISCONNECTED) {
 958                 if (nam != NULL) {
 959                         error = EISCONN;
 960                         goto bad;
 961                 }
 962                 /* XXX */
 963                 bzero(&tmp, sizeof(tmp));
 964                 tmp.sin6_family = AF_INET6;
 965                 tmp.sin6_len = sizeof(struct sockaddr_in6);
 966                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
 967                       sizeof(struct in6_addr));
 968                 dst = &tmp;
 969         } else {
 970                 if (nam == NULL) {
 971                         error = ENOTCONN;
 972                         goto bad;
 973                 }
 974                 tmp = *(struct sockaddr_in6 *)(void *)nam;
 975                 dst = &tmp;
 976         }
 977 #if ENABLE_DEFAULT_SCOPE
 978         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
 979                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
 980         }
 981 #endif
 982         return (rip6_output(m, so, dst, control, 1));
 983
 984 bad:
 985         VERIFY(error != 0);
 986
 987         if (m != NULL)
 988                 m_freem(m);
 989         if (control != NULL)
 990                 m_freem(control);
 991
 992         return (error);
 993 }
 994
 995 struct pr_usrreqs rip6_usrreqs = {
 996         .pru_abort =            rip6_abort,
 997         .pru_attach =           rip6_attach,
 998         .pru_bind =             rip6_bind,
 999         .pru_connect =          rip6_connect,
1000         .pru_control =          in6_control,
1001         .pru_detach =           rip6_detach,
1002         .pru_disconnect =       rip6_disconnect,
1003         .pru_peeraddr =         in6_getpeeraddr,
1004         .pru_send =             rip6_send,
1005         .pru_shutdown =         rip6_shutdown,
1006         .pru_sockaddr =         in6_getsockaddr,
1007         .pru_sosend =           sosend,
1008         .pru_soreceive =        soreceive,
1009 };
1010
1011 __private_extern__ struct pr_usrreqs icmp6_dgram_usrreqs = {
1012         .pru_abort =            rip6_abort,
1013         .pru_attach =           icmp6_dgram_attach,
1014         .pru_bind =             rip6_bind,
1015         .pru_connect =          rip6_connect,
1016         .pru_control =          in6_control,
1017         .pru_detach =           rip6_detach,
1018         .pru_disconnect =       rip6_disconnect,
1019         .pru_peeraddr =         in6_getpeeraddr,
1020         .pru_send =             icmp6_dgram_send,
1021         .pru_shutdown =         rip6_shutdown,
1022         .pru_sockaddr =         in6_getsockaddr,
1023         .pru_sosend =           sosend,
1024         .pru_soreceive =        soreceive,
1025 };