bsd/netinet6/raw_ip6.c

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