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)) {
 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                                         ret = ip6_savecontrol(last, n, &opts);
 210                                         if (ret != 0) {
 211                                                 m_freem(n);
 212                                                 m_freem(opts);
 213                                                 last = in6p;
 214                                                 continue;
 215                                         }
 216                                 }
 217                                 /* strip intermediate headers */
 218                                 m_adj(n, *offp);
 219                                 so_recv_data_stat(last->in6p_socket, m, 0);
 220                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 221                                                 (struct sockaddr *)&rip6src,
 222                                                  n, opts, NULL) == 0) {
 223                                         rip6stat.rip6s_fullsock++;
 224                                 } else
 225                                         sorwakeup(last->in6p_socket);
 226                                 opts = NULL;
 227                         }
 228                 }
 229                 last = in6p;
 230         }
 231
 232 #if NECP
 233         if (last && !necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 234                 &ip6->ip6_dst, &ip6->ip6_src, ifp, NULL, NULL)) {
 235                 m_freem(m);
 236                 ip6stat.ip6s_delivered--;
 237                 /* do not inject data into pcb */
 238         } else
 239 #endif /* NECP */
 240         if (last) {
 241                 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
 242                     (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
 243                     (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
 244                         ret = ip6_savecontrol(last, m, &opts);
 245                         if (ret != 0) {
 246                                 m_freem(m);
 247                                 m_freem(opts);
 248                                 ip6stat.ip6s_delivered--;
 249                                 goto unlock;
 250                         }
 251
 252                 }
 253                 /* strip intermediate headers */
 254                 m_adj(m, *offp);
 255                 so_recv_data_stat(last->in6p_socket, m, 0);
 256                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 257                                 (struct sockaddr *)&rip6src, m, opts, NULL) == 0) {
 258                         rip6stat.rip6s_fullsock++;
 259                 } else
 260                         sorwakeup(last->in6p_socket);
 261         } else {
 262                 rip6stat.rip6s_nosock++;
 263                 if (m->m_flags & M_MCAST)
 264                         rip6stat.rip6s_nosockmcast++;
 265                 if (proto == IPPROTO_NONE)
 266                         m_freem(m);
 267                 else {
 268                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
 269                         icmp6_error(m, ICMP6_PARAM_PROB,
 270                                     ICMP6_PARAMPROB_NEXTHEADER,
 271                                     prvnxtp - mtod(m, char *));
 272                 }
 273                 ip6stat.ip6s_delivered--;
 274         }
 275
 276 unlock:
 277         lck_rw_done(ripcbinfo.ipi_lock);
 278
 279         return IPPROTO_DONE;
 280 }
 281
 282 void
 283 rip6_ctlinput(
 284         int cmd,
 285         struct sockaddr *sa,
 286         void *d,
 287         __unused struct ifnet *ifp)
 288 {
 289         struct ip6_hdr *ip6;
 290         struct mbuf *m;
 291         void *cmdarg = NULL;
 292         int off = 0;
 293         struct ip6ctlparam *ip6cp = NULL;
 294         const struct sockaddr_in6 *sa6_src = NULL;
 295         void (*notify)(struct inpcb *, int) = in6_rtchange;
 296
 297         if (sa->sa_family != AF_INET6 ||
 298             sa->sa_len != sizeof(struct sockaddr_in6))
 299                 return;
 300
 301         if ((unsigned)cmd >= PRC_NCMDS)
 302                 return;
 303         if (PRC_IS_REDIRECT(cmd)) {
 304                 notify = in6_rtchange;
 305                 d = NULL;
 306         } else if (cmd == PRC_HOSTDEAD)
 307                 d = NULL;
 308         else if (inet6ctlerrmap[cmd] == 0)
 309                 return;
 310
 311         /* if the parameter is from icmp6, decode it. */
 312         if (d != NULL) {
 313                 ip6cp = (struct ip6ctlparam *)d;
 314                 m = ip6cp->ip6c_m;
 315                 ip6 = ip6cp->ip6c_ip6;
 316                 off = ip6cp->ip6c_off;
 317                 cmdarg = ip6cp->ip6c_cmdarg;
 318                 sa6_src = ip6cp->ip6c_src;
 319         } else {
 320                 m = NULL;
 321                 ip6 = NULL;
 322                 sa6_src = &sa6_any;
 323         }
 324
 325         (void) in6_pcbnotify(&ripcbinfo, sa, 0, (const struct sockaddr *)sa6_src,
 326                              0, cmd, cmdarg, notify);
 327 }
 328
 329 /*
 330  * Generate IPv6 header and pass packet to ip6_output.
 331  * Tack on options user may have setup with control call.
 332  */
 333 int
 334 rip6_output(
 335         struct mbuf *m,
 336         struct socket *so,
 337         struct sockaddr_in6 *dstsock,
 338         struct mbuf *control,
 339         int israw)
 340 {
 341         struct in6_addr *dst;
 342         struct ip6_hdr *ip6;
 343         struct inpcb *in6p;
 344         u_int   plen = m->m_pkthdr.len;
 345         int error = 0;
 346         struct ip6_pktopts opt, *optp = NULL;
 347         struct ip6_moptions *im6o = NULL;
 348         struct ifnet *oifp = NULL;
 349         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
 350         int sotc = SO_TC_UNSPEC;
 351         int netsvctype = _NET_SERVICE_TYPE_UNSPEC;
 352         struct ip6_out_args ip6oa;
 353         int flags = IPV6_OUTARGS;
 354
 355         in6p = sotoin6pcb(so);
 356
 357         bzero(&ip6oa, sizeof(ip6oa));
 358         ip6oa.ip6oa_boundif = IFSCOPE_NONE;
 359         ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF;
 360
 361         if (in6p == NULL
 362 #if NECP
 363                 || (necp_socket_should_use_flow_divert(in6p))
 364 #endif /* NECP */
 365                 ) {
 366                 if (in6p == NULL)
 367                         error = EINVAL;
 368                 else
 369                         error = EPROTOTYPE;
 370                 goto bad;
 371         }
 372         if (dstsock != NULL && IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
 373                 error = EINVAL;
 374                 goto bad;
 375         }
 376
 377         if (in6p->inp_flags & INP_BOUND_IF) {
 378                 ip6oa.ip6oa_boundif = in6p->inp_boundifp->if_index;
 379                 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
 380         }
 381         if (INP_NO_CELLULAR(in6p))
 382                 ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
 383         if (INP_NO_EXPENSIVE(in6p))
 384                 ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
 385         if (INP_AWDL_UNRESTRICTED(in6p))
 386                 ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
 387         if (INP_INTCOPROC_ALLOWED(in6p))
 388                 ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED;
 389
 390         dst = &dstsock->sin6_addr;
 391         if (control) {
 392                 sotc = so_tc_from_control(control, &netsvctype);
 393
 394                 if ((error = ip6_setpktopts(control, &opt, NULL,
 395                     SOCK_PROTO(so))) != 0)
 396                         goto bad;
 397                 optp = &opt;
 398         } else
 399                 optp = in6p->in6p_outputopts;
 400         if (sotc == SO_TC_UNSPEC) {
 401                 sotc = so->so_traffic_class;
 402                 netsvctype = so->so_netsvctype;
 403         }
 404         ip6oa.ip6oa_sotc = sotc;
 405         ip6oa.ip6oa_netsvctype = netsvctype;
 406
 407         /*
 408          * For an ICMPv6 packet, we should know its type and code
 409          * to update statistics.
 410          */
 411         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 412                 struct icmp6_hdr *icmp6;
 413                 if (m->m_len < sizeof(struct icmp6_hdr) &&
 414                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
 415                         error = ENOBUFS;
 416                         goto bad;
 417                 }
 418                 icmp6 = mtod(m, struct icmp6_hdr *);
 419                 type = icmp6->icmp6_type;
 420                 code = icmp6->icmp6_code;
 421         }
 422
 423         if (in6p->inp_flowhash == 0)
 424                 in6p->inp_flowhash = inp_calc_flowhash(in6p);
 425         /* update flowinfo - RFC 6437 */
 426         if (in6p->inp_flow == 0 && in6p->in6p_flags & IN6P_AUTOFLOWLABEL) {
 427                 in6p->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 428                 in6p->inp_flow |=
 429                     (htonl(in6p->inp_flowhash) & IPV6_FLOWLABEL_MASK);
 430         }
 431
 432         M_PREPEND(m, sizeof(*ip6), M_WAIT, 1);
 433         if (m == NULL) {
 434                 error = ENOBUFS;
 435                 goto bad;
 436         }
 437         ip6 = mtod(m, struct ip6_hdr *);
 438
 439         /*
 440          * Next header might not be ICMP6 but use its pseudo header anyway.
 441          */
 442         ip6->ip6_dst = *dst;
 443
 444         im6o = in6p->in6p_moptions;
 445
 446         /*
 447          * If the scope of the destination is link-local, embed the interface
 448          * index in the address.
 449          *
 450          * XXX advanced-api value overrides sin6_scope_id
 451          */
 452         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 453                 struct in6_pktinfo *pi;
 454                 struct ifnet *im6o_multicast_ifp = NULL;
 455
 456                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && im6o != NULL) {
 457                         IM6O_LOCK(im6o);
 458                         im6o_multicast_ifp = im6o->im6o_multicast_ifp;
 459                         IM6O_UNLOCK(im6o);
 460                 }
 461                 /*
 462                  * XXX Boundary check is assumed to be already done in
 463                  * ip6_setpktoptions().
 464                  */
 465                 ifnet_head_lock_shared();
 466                 if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
 467                         ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
 468                         oifp = ifindex2ifnet[pi->ipi6_ifindex];
 469                         if (oifp != NULL)
 470                                 ifnet_reference(oifp);
 471                 } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 472                     im6o != NULL && im6o_multicast_ifp != NULL) {
 473                         oifp = im6o_multicast_ifp;
 474                         ifnet_reference(oifp);
 475                         ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
 476                 } else if (dstsock->sin6_scope_id) {
 477                         /*
 478                          * boundary check
 479                          *
 480                          * Sinced stsock->sin6_scope_id is unsigned, we don't
 481                          * need to check if it's < 0
 482                          */
 483                         if (if_index < dstsock->sin6_scope_id) {
 484                                 error = ENXIO;  /* XXX EINVAL? */
 485                                 ifnet_head_done();
 486                                 goto bad;
 487                         }
 488                         ip6->ip6_dst.s6_addr16[1]
 489                                 = htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
 490                 }
 491                 ifnet_head_done();
 492         }
 493
 494         /*
 495          * Source address selection.
 496          */
 497         {
 498                 struct in6_addr *in6a;
 499                 struct in6_addr storage;
 500                 u_short index = 0;
 501
 502                 if (israw != 0 && optp && optp->ip6po_pktinfo && !IN6_IS_ADDR_UNSPECIFIED(&optp->ip6po_pktinfo->ipi6_addr)) {
 503                         in6a = &optp->ip6po_pktinfo->ipi6_addr;
 504                         flags |= IPV6_FLAG_NOSRCIFSEL;
 505                 } else if ((in6a = in6_selectsrc(dstsock, optp, in6p,
 506                     &in6p->in6p_route, NULL, &storage, ip6oa.ip6oa_boundif,
 507                     &error)) == 0) {
 508                         if (error == 0)
 509                                 error = EADDRNOTAVAIL;
 510                         goto bad;
 511                 } else {
 512                         ip6oa.ip6oa_flags |= IP6OAF_BOUND_SRCADDR;
 513                 }
 514                 ip6->ip6_src = *in6a;
 515                 if (in6p->in6p_route.ro_rt != NULL) {
 516                         RT_LOCK(in6p->in6p_route.ro_rt);
 517                         if (in6p->in6p_route.ro_rt->rt_ifp != NULL)
 518                                 index = in6p->in6p_route.ro_rt->rt_ifp->if_index;
 519                         RT_UNLOCK(in6p->in6p_route.ro_rt);
 520                         if (oifp != NULL)
 521                                 ifnet_release(oifp);
 522                         ifnet_head_lock_shared();
 523                         if (index == 0 || if_index < index) {
 524                                 panic("bad if_index on interface from route");
 525                         }
 526                         oifp = ifindex2ifnet[index];
 527                         if (oifp != NULL)
 528                                 ifnet_reference(oifp);
 529                         ifnet_head_done();
 530                 }
 531         }
 532         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
 533                 (in6p->inp_flow & IPV6_FLOWINFO_MASK);
 534         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
 535                 (IPV6_VERSION & IPV6_VERSION_MASK);
 536         /* ip6_plen will be filled in ip6_output, so not fill it here. */
 537         ip6->ip6_nxt = in6p->in6p_ip6_nxt;
 538         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
 539
 540         if (SOCK_PROTO(so) == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
 541                 struct mbuf *n;
 542                 int off;
 543                 u_int16_t *p;
 544
 545                 /* compute checksum */
 546                 if (SOCK_PROTO(so) == IPPROTO_ICMPV6)
 547                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
 548                 else
 549                         off = in6p->in6p_cksum;
 550                 if (plen < (unsigned int)(off + 1)) {
 551                         error = EINVAL;
 552                         goto bad;
 553                 }
 554                 off += sizeof(struct ip6_hdr);
 555
 556                 n = m;
 557                 while (n && n->m_len <= off) {
 558                         off -= n->m_len;
 559                         n = n->m_next;
 560                 }
 561                 if (!n)
 562                         goto bad;
 563                 p = (u_int16_t *)(void *)(mtod(n, caddr_t) + off);
 564                 *p = 0;
 565                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
 566         }
 567
 568 #if NECP
 569         {
 570                 necp_kernel_policy_id policy_id;
 571                 u_int32_t route_rule_id;
 572
 573                 /*
 574                  * We need a route to perform NECP route rule checks
 575                  */
 576                 if (net_qos_policy_restricted != 0 &&
 577                     ROUTE_UNUSABLE(&in6p->in6p_route)) {
 578                         struct sockaddr_in6 to;
 579                         struct sockaddr_in6 from;
 580
 581                         ROUTE_RELEASE(&in6p->in6p_route);
 582
 583                         bzero(&from, sizeof(struct sockaddr_in6));
 584                         from.sin6_family = AF_INET6;
 585                         from.sin6_len = sizeof(struct sockaddr_in6);
 586                         from.sin6_addr = ip6->ip6_src;
 587
 588                         bzero(&to, sizeof(struct sockaddr_in6));
 589                         to.sin6_family = AF_INET6;
 590                         to.sin6_len = sizeof(struct sockaddr_in6);
 591                         to.sin6_addr = ip6->ip6_dst;
 592
 593                         in6p->in6p_route.ro_dst.sin6_family = AF_INET6;
 594                         in6p->in6p_route.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
 595                         ((struct sockaddr_in6 *)(void *)&in6p->in6p_route.ro_dst)->sin6_addr =
 596                                 ip6->ip6_dst;
 597
 598                         rtalloc_scoped((struct route *)&in6p->in6p_route, ip6oa.ip6oa_boundif);
 599
 600                         inp_update_necp_policy(in6p, (struct sockaddr *)&from,
 601                             (struct sockaddr *)&to, ip6oa.ip6oa_boundif);
 602                         in6p->inp_policyresult.results.qos_marking_gencount = 0;
 603                 }
 604
 605                 if (!necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
 606                         &ip6->ip6_src, &ip6->ip6_dst, NULL, &policy_id, &route_rule_id)) {
 607                         error = EHOSTUNREACH;
 608                         goto bad;
 609                 }
 610
 611                 necp_mark_packet_from_socket(m, in6p, policy_id, route_rule_id);
 612
 613                 if (net_qos_policy_restricted != 0) {
 614                         necp_socket_update_qos_marking(in6p, in6p->in6p_route.ro_rt,
 615                             NULL, route_rule_id);
 616                 }
 617         }
 618 #endif /* NECP */
 619         if ((so->so_flags1 & SOF1_QOSMARKING_ALLOWED))
 620                 ip6oa.ip6oa_flags |= IP6OAF_QOSMARKING_ALLOWED;
 621
 622 #if IPSEC
 623         if (in6p->in6p_sp != NULL && ipsec_setsocket(m, so) != 0) {
 624                 error = ENOBUFS;
 625                 goto bad;
 626         }
 627 #endif /*IPSEC*/
 628
 629         if (ROUTE_UNUSABLE(&in6p->in6p_route))
 630                 ROUTE_RELEASE(&in6p->in6p_route);
 631
 632         if (oifp != NULL) {
 633                 ifnet_release(oifp);
 634                 oifp = NULL;
 635         }
 636
 637         set_packet_service_class(m, so, sotc, PKT_SCF_IPV6);
 638         m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB;
 639         m->m_pkthdr.pkt_flowid = in6p->inp_flowhash;
 640         m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC |
 641             PKTF_FLOW_RAWSOCK);
 642         m->m_pkthdr.pkt_proto = in6p->in6p_ip6_nxt;
 643
 644         if (im6o != NULL)
 645                 IM6O_ADDREF(im6o);
 646
 647         error = ip6_output(m, optp, &in6p->in6p_route, flags, im6o,
 648             &oifp, &ip6oa);
 649
 650         if (im6o != NULL)
 651                 IM6O_REMREF(im6o);
 652
 653         if (in6p->in6p_route.ro_rt != NULL) {
 654                 struct rtentry *rt = in6p->in6p_route.ro_rt;
 655                 struct ifnet *outif;
 656
 657                 if ((rt->rt_flags & RTF_MULTICAST) ||
 658                     in6p->in6p_socket == NULL ||
 659                     !(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
 660                         rt = NULL;      /* unusable */
 661                 }
 662                 /*
 663                  * Always discard the cached route for unconnected
 664                  * socket or if it is a multicast route.
 665                  */
 666                 if (rt == NULL)
 667                         ROUTE_RELEASE(&in6p->in6p_route);
 668
 669                 /*
 670                  * If this is a connected socket and the destination
 671                  * route is not multicast, update outif with that of
 672                  * the route interface index used by IP.
 673                  */
 674                 if (rt != NULL &&
 675                     (outif = rt->rt_ifp) != in6p->in6p_last_outifp) {
 676                         in6p->in6p_last_outifp = outif;
 677                 }
 678         } else {
 679                 ROUTE_RELEASE(&in6p->in6p_route);
 680         }
 681
 682         /*
 683          * If output interface was cellular/expensive, and this socket is
 684          * denied access to it, generate an event.
 685          */
 686         if (error != 0 && (ip6oa.ip6oa_retflags & IP6OARF_IFDENIED) &&
 687             (INP_NO_CELLULAR(in6p) || INP_NO_EXPENSIVE(in6p)))
 688                 soevent(in6p->inp_socket, (SO_FILT_HINT_LOCKED|
 689                     SO_FILT_HINT_IFDENIED));
 690
 691         if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
 692                 if (oifp)
 693                         icmp6_ifoutstat_inc(oifp, type, code);
 694                 icmp6stat.icp6s_outhist[type]++;
 695         } else
 696                 rip6stat.rip6s_opackets++;
 697
 698         goto freectl;
 699
 700 bad:
 701         if (m != NULL)
 702                 m_freem(m);
 703
 704 freectl:
 705         if (optp == &opt && optp->ip6po_rthdr)
 706                 ROUTE_RELEASE(&optp->ip6po_route);
 707
 708         if (control != NULL) {
 709                 if (optp == &opt)
 710                         ip6_clearpktopts(optp, -1);
 711                 m_freem(control);
 712         }
 713         if (oifp != NULL)
 714                 ifnet_release(oifp);
 715         return(error);
 716 }
 717
 718 /*
 719  * Raw IPv6 socket option processing.
 720  */
 721 int
 722 rip6_ctloutput(
 723         struct socket *so,
 724         struct sockopt *sopt)
 725 {
 726         int error, optval;
 727
 728         /* Allow <SOL_SOCKET,SO_FLUSH> at this level */
 729         if (sopt->sopt_level == IPPROTO_ICMPV6)
 730                 /*
 731                  * XXX: is it better to call icmp6_ctloutput() directly
 732                  * from protosw?
 733                  */
 734                 return(icmp6_ctloutput(so, sopt));
 735         else if (sopt->sopt_level != IPPROTO_IPV6 &&
 736             !(sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_FLUSH))
 737                 return (EINVAL);
 738
 739         error = 0;
 740
 741         switch (sopt->sopt_dir) {
 742         case SOPT_GET:
 743                 switch (sopt->sopt_name) {
 744                 case IPV6_CHECKSUM:
 745                         error = ip6_raw_ctloutput(so, sopt);
 746                         break;
 747                 default:
 748                         error = ip6_ctloutput(so, sopt);
 749                         break;
 750                 }
 751                 break;
 752
 753         case SOPT_SET:
 754                 switch (sopt->sopt_name) {
 755                 case IPV6_CHECKSUM:
 756                         error = ip6_raw_ctloutput(so, sopt);
 757                         break;
 758
 759                 case SO_FLUSH:
 760                         if ((error = sooptcopyin(sopt, &optval, sizeof (optval),
 761                             sizeof (optval))) != 0)
 762                                 break;
 763
 764                         error = inp_flush(sotoinpcb(so), optval);
 765                         break;
 766
 767                 default:
 768                         error = ip6_ctloutput(so, sopt);
 769                         break;
 770                 }
 771                 break;
 772         }
 773
 774         return (error);
 775 }
 776
 777 static int
 778 rip6_attach(struct socket *so, int proto, struct proc *p)
 779 {
 780         struct inpcb *inp;
 781         int error;
 782
 783         inp = sotoinpcb(so);
 784         if (inp)
 785                 panic("rip6_attach");
 786         if ((error = proc_suser(p)) != 0)
 787                 return error;
 788
 789         error = soreserve(so, rip_sendspace, rip_recvspace);
 790         if (error)
 791                 return error;
 792         error = in_pcballoc(so, &ripcbinfo, p);
 793         if (error)
 794                 return error;
 795         inp = (struct inpcb *)so->so_pcb;
 796         inp->inp_vflag |= INP_IPV6;
 797         inp->in6p_ip6_nxt = (char)proto;
 798         inp->in6p_hops = -1;    /* use kernel default */
 799         inp->in6p_cksum = -1;
 800         MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
 801                sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
 802         if (inp->in6p_icmp6filt == NULL)
 803                 return (ENOMEM);
 804         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
 805         return 0;
 806 }
 807
 808 static int
 809 rip6_detach(struct socket *so)
 810 {
 811         struct inpcb *inp;
 812
 813         inp = sotoinpcb(so);
 814         if (inp == 0)
 815                 panic("rip6_detach");
 816         /* xxx: RSVP */
 817         if (inp->in6p_icmp6filt) {
 818                 FREE(inp->in6p_icmp6filt, M_PCB);
 819                 inp->in6p_icmp6filt = NULL;
 820         }
 821         in6_pcbdetach(inp);
 822         return 0;
 823 }
 824
 825 static int
 826 rip6_abort(struct socket *so)
 827 {
 828         soisdisconnected(so);
 829         return rip6_detach(so);
 830 }
 831
 832 static int
 833 rip6_disconnect(struct socket *so)
 834 {
 835         struct inpcb *inp = sotoinpcb(so);
 836
 837         if ((so->so_state & SS_ISCONNECTED) == 0)
 838                 return ENOTCONN;
 839         inp->in6p_faddr = in6addr_any;
 840         return rip6_abort(so);
 841 }
 842
 843 static int
 844 rip6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
 845 {
 846 #pragma unused(p)
 847         struct inpcb *inp = sotoinpcb(so);
 848         struct sockaddr_in6 sin6;
 849         struct ifaddr *ifa = NULL;
 850         struct ifnet *outif = NULL;
 851         int error;
 852
 853         if (inp == NULL
 854 #if NECP
 855                 || (necp_socket_should_use_flow_divert(inp))
 856 #endif /* NECP */
 857                 )
 858                 return (inp == NULL ? EINVAL : EPROTOTYPE);
 859
 860         if (nam->sa_len != sizeof (struct sockaddr_in6))
 861                 return (EINVAL);
 862
 863         if (TAILQ_EMPTY(&ifnet_head) || SIN6(nam)->sin6_family != AF_INET6)
 864                 return (EADDRNOTAVAIL);
 865
 866         bzero(&sin6, sizeof (sin6));
 867         *(&sin6) = *SIN6(nam);
 868
 869         if ((error = sa6_embedscope(&sin6, ip6_use_defzone)) != 0)
 870                 return (error);
 871
 872         /* Sanitize local copy for address searches */
 873         sin6.sin6_flowinfo = 0;
 874         sin6.sin6_scope_id = 0;
 875         sin6.sin6_port = 0;
 876
 877         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) &&
 878             (ifa = ifa_ifwithaddr(SA(&sin6))) == 0)
 879                 return (EADDRNOTAVAIL);
 880         if (ifa != NULL) {
 881                 IFA_LOCK(ifa);
 882                 if (((struct in6_ifaddr *)ifa)->ia6_flags &
 883                     (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
 884                      IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
 885                         IFA_UNLOCK(ifa);
 886                         IFA_REMREF(ifa);
 887                         return (EADDRNOTAVAIL);
 888                 }
 889                 outif = ifa->ifa_ifp;
 890                 IFA_UNLOCK(ifa);
 891                 IFA_REMREF(ifa);
 892         }
 893         inp->in6p_laddr = sin6.sin6_addr;
 894         inp->in6p_last_outifp = outif;
 895
 896         return (0);
 897 }
 898
 899 static int
 900 rip6_connect(struct socket *so, struct sockaddr *nam, __unused struct proc *p)
 901 {
 902         struct inpcb *inp = sotoinpcb(so);
 903         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(void *)nam;
 904         struct in6_addr *in6a = NULL;
 905         struct in6_addr storage;
 906         int error = 0;
 907 #if ENABLE_DEFAULT_SCOPE
 908         struct sockaddr_in6 tmp;
 909 #endif
 910         unsigned int ifscope;
 911         struct ifnet *outif = NULL;
 912
 913         if (inp == NULL
 914 #if NECP
 915                 || (necp_socket_should_use_flow_divert(inp))
 916 #endif /* NECP */
 917                 )
 918                 return (inp == NULL ? EINVAL : EPROTOTYPE);
 919         if (nam->sa_len != sizeof(*addr))
 920                 return EINVAL;
 921         if (TAILQ_EMPTY(&ifnet_head))
 922                 return EADDRNOTAVAIL;
 923         if (addr->sin6_family != AF_INET6)
 924                 return EAFNOSUPPORT;
 925
 926         if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
 927                 so->so_flags1 |= SOF1_CONNECT_COUNTED;
 928                 INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet6_dgram_connected);
 929         }
 930
 931 #if ENABLE_DEFAULT_SCOPE
 932         if (addr->sin6_scope_id == 0) { /* not change if specified  */
 933                 /* avoid overwrites */
 934                 tmp = *addr;
 935                 addr = &tmp;
 936                 addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
 937         }
 938 #endif
 939
 940         /* KAME hack: embed scopeid */
 941         if (in6_embedscope(&SIN6(nam)->sin6_addr, SIN6(nam), inp, NULL, NULL) != 0)
 942                 return (EINVAL);
 943
 944         ifscope = (inp->inp_flags & INP_BOUND_IF) ?
 945             inp->inp_boundifp->if_index : IFSCOPE_NONE;
 946
 947         /* Source address selection. XXX: need pcblookup? */
 948         in6a = in6_selectsrc(addr, inp->in6p_outputopts, inp, &inp->in6p_route,
 949             NULL, &storage, ifscope, &error);
 950         if (in6a == NULL)
 951                 return (error ? error : EADDRNOTAVAIL);
 952         inp->in6p_laddr = *in6a;
 953         inp->in6p_faddr = addr->sin6_addr;
 954         if (inp->in6p_route.ro_rt != NULL)
 955                 outif = inp->in6p_route.ro_rt->rt_ifp;
 956         inp->in6p_last_outifp = outif;
 957
 958         soisconnected(so);
 959         return 0;
 960 }
 961
 962 static int
 963 rip6_shutdown(struct socket *so)
 964 {
 965         socantsendmore(so);
 966         return 0;
 967 }
 968
 969 static int
 970 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 971     struct mbuf *control, struct proc *p)
 972 {
 973 #pragma unused(flags, p)
 974         struct inpcb *inp = sotoinpcb(so);
 975         struct sockaddr_in6 tmp;
 976         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam;
 977         int error = 0;
 978
 979         if (inp == NULL
 980 #if NECP
 981                 || (necp_socket_should_use_flow_divert(inp))
 982 #endif /* NECP */
 983                 ) {
 984                 if (inp == NULL)
 985                         error = EINVAL;
 986                 else
 987                         error = EPROTOTYPE;
 988                 goto bad;
 989         }
 990
 991         /* always copy sockaddr to avoid overwrites */
 992         if (so->so_state & SS_ISCONNECTED) {
 993                 if (nam != NULL) {
 994                         error = EISCONN;
 995                         goto bad;
 996                 }
 997                 /* XXX */
 998                 bzero(&tmp, sizeof(tmp));
 999                 tmp.sin6_family = AF_INET6;
1000                 tmp.sin6_len = sizeof(struct sockaddr_in6);
1001                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
1002                       sizeof(struct in6_addr));
1003                 dst = &tmp;
1004         } else {
1005                 if (nam == NULL) {
1006                         error = ENOTCONN;
1007                         goto bad;
1008                 }
1009                 tmp = *(struct sockaddr_in6 *)(void *)nam;
1010                 dst = &tmp;
1011         }
1012 #if ENABLE_DEFAULT_SCOPE
1013         if (dst->sin6_scope_id == 0) {  /* not change if specified  */
1014                 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
1015         }
1016 #endif
1017         return (rip6_output(m, so, dst, control, 1));
1018
1019 bad:
1020         VERIFY(error != 0);
1021
1022         if (m != NULL)
1023                 m_freem(m);
1024         if (control != NULL)
1025                 m_freem(control);
1026
1027         return (error);
1028 }
1029
1030 struct pr_usrreqs rip6_usrreqs = {
1031         .pru_abort =            rip6_abort,
1032         .pru_attach =           rip6_attach,
1033         .pru_bind =             rip6_bind,
1034         .pru_connect =          rip6_connect,
1035         .pru_control =          in6_control,
1036         .pru_detach =           rip6_detach,
1037         .pru_disconnect =       rip6_disconnect,
1038         .pru_peeraddr =         in6_getpeeraddr,
1039         .pru_send =             rip6_send,
1040         .pru_shutdown =         rip6_shutdown,
1041         .pru_sockaddr =         in6_getsockaddr,
1042         .pru_sosend =           sosend,
1043         .pru_soreceive =        soreceive,
1044 };
1045
1046 __private_extern__ struct pr_usrreqs icmp6_dgram_usrreqs = {
1047         .pru_abort =            rip6_abort,
1048         .pru_attach =           icmp6_dgram_attach,
1049         .pru_bind =             rip6_bind,
1050         .pru_connect =          rip6_connect,
1051         .pru_control =          in6_control,
1052         .pru_detach =           rip6_detach,
1053         .pru_disconnect =       rip6_disconnect,
1054         .pru_peeraddr =         in6_getpeeraddr,
1055         .pru_send =             icmp6_dgram_send,
1056         .pru_shutdown =         rip6_shutdown,
1057         .pru_sockaddr =         in6_getsockaddr,
1058         .pru_sosend =           sosend,
1059         .pru_soreceive =        soreceive,
1060 };