1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1988, 1993 34 * The Regents of the University of California. 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __FBSDID("$FreeBSD$"); 66 67 #include "opt_ipsec.h" 68 #include "opt_inet6.h" 69 70 #include <sys/param.h> 71 #include <sys/errno.h> 72 #include <sys/jail.h> 73 #include <sys/kernel.h> 74 #include <sys/lock.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/priv.h> 78 #include <sys/proc.h> 79 #include <sys/protosw.h> 80 #include <sys/signalvar.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/sx.h> 84 #include <sys/syslog.h> 85 86 #include <net/if.h> 87 #include <net/if_var.h> 88 #include <net/if_types.h> 89 #include <net/route.h> 90 #include <net/vnet.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/in_pcb.h> 96 97 #include <netinet/icmp6.h> 98 #include <netinet/ip6.h> 99 #include <netinet/ip_var.h> 100 #include <netinet6/ip6protosw.h> 101 #include <netinet6/ip6_mroute.h> 102 #include <netinet6/in6_pcb.h> 103 #include <netinet6/ip6_var.h> 104 #include <netinet6/nd6.h> 105 #include <netinet6/raw_ip6.h> 106 #include <netinet6/scope6_var.h> 107 #include <netinet6/send.h> 108 109 #include <netipsec/ipsec_support.h> 110 111 #include <machine/stdarg.h> 112 113 #define satosin6(sa) ((struct sockaddr_in6 *)(sa)) 114 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 115 116 /* 117 * Raw interface to IP6 protocol. 118 */ 119 120 VNET_DECLARE(struct inpcbhead, ripcb); 121 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 122 #define V_ripcb VNET(ripcb) 123 #define V_ripcbinfo VNET(ripcbinfo) 124 125 extern u_long rip_sendspace; 126 extern u_long rip_recvspace; 127 128 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat); 129 VNET_PCPUSTAT_SYSINIT(rip6stat); 130 131 #ifdef VIMAGE 132 VNET_PCPUSTAT_SYSUNINIT(rip6stat); 133 #endif /* VIMAGE */ 134 135 /* 136 * Hooks for multicast routing. They all default to NULL, so leave them not 137 * initialized and rely on BSS being set to 0. 138 */ 139 140 /* 141 * The socket used to communicate with the multicast routing daemon. 142 */ 143 VNET_DEFINE(struct socket *, ip6_mrouter); 144 145 /* 146 * The various mrouter functions. 147 */ 148 int (*ip6_mrouter_set)(struct socket *, struct sockopt *); 149 int (*ip6_mrouter_get)(struct socket *, struct sockopt *); 150 int (*ip6_mrouter_done)(void); 151 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *); 152 int (*mrt6_ioctl)(u_long, caddr_t); 153 154 /* 155 * Setup generic address and protocol structures for raw_input routine, then 156 * pass them along with mbuf chain. 157 */ 158 int 159 rip6_input(struct mbuf **mp, int *offp, int proto) 160 { 161 struct ifnet *ifp; 162 struct mbuf *m = *mp; 163 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 164 struct inpcb *in6p; 165 struct inpcb *last = NULL; 166 struct mbuf *opts = NULL; 167 struct sockaddr_in6 fromsa; 168 struct epoch_tracker et; 169 170 RIP6STAT_INC(rip6s_ipackets); 171 172 init_sin6(&fromsa, m, 0); /* general init */ 173 174 ifp = m->m_pkthdr.rcvif; 175 176 INP_INFO_RLOCK_ET(&V_ripcbinfo, et); 177 CK_LIST_FOREACH(in6p, &V_ripcb, inp_list) { 178 /* XXX inp locking */ 179 if ((in6p->inp_vflag & INP_IPV6) == 0) 180 continue; 181 if (in6p->inp_ip_p && 182 in6p->inp_ip_p != proto) 183 continue; 184 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 185 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 186 continue; 187 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 188 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 189 continue; 190 if (last != NULL) { 191 struct mbuf *n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 192 193 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 194 /* 195 * Check AH/ESP integrity. 196 */ 197 if (IPSEC_ENABLED(ipv6)) { 198 if (n != NULL && 199 IPSEC_CHECK_POLICY(ipv6, n, last) != 0) { 200 m_freem(n); 201 /* Do not inject data into pcb. */ 202 n = NULL; 203 } 204 } 205 #endif /* IPSEC */ 206 if (n) { 207 if (last->inp_flags & INP_CONTROLOPTS || 208 last->inp_socket->so_options & SO_TIMESTAMP) 209 ip6_savecontrol(last, n, &opts); 210 /* strip intermediate headers */ 211 m_adj(n, *offp); 212 if (sbappendaddr(&last->inp_socket->so_rcv, 213 (struct sockaddr *)&fromsa, 214 n, opts) == 0) { 215 m_freem(n); 216 if (opts) 217 m_freem(opts); 218 RIP6STAT_INC(rip6s_fullsock); 219 } else 220 sorwakeup(last->inp_socket); 221 opts = NULL; 222 } 223 INP_RUNLOCK(last); 224 last = NULL; 225 } 226 INP_RLOCK(in6p); 227 if (__predict_false(in6p->inp_flags2 & INP_FREED)) 228 goto skip_2; 229 if (jailed_without_vnet(in6p->inp_cred)) { 230 /* 231 * Allow raw socket in jail to receive multicast; 232 * assume process had PRIV_NETINET_RAW at attach, 233 * and fall through into normal filter path if so. 234 */ 235 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 236 prison_check_ip6(in6p->inp_cred, 237 &ip6->ip6_dst) != 0) 238 goto skip_2; 239 } 240 if (in6p->in6p_cksum != -1) { 241 RIP6STAT_INC(rip6s_isum); 242 if (in6_cksum(m, proto, *offp, 243 m->m_pkthdr.len - *offp)) { 244 RIP6STAT_INC(rip6s_badsum); 245 goto skip_2; 246 } 247 } 248 /* 249 * If this raw socket has multicast state, and we 250 * have received a multicast, check if this socket 251 * should receive it, as multicast filtering is now 252 * the responsibility of the transport layer. 253 */ 254 if (in6p->in6p_moptions && 255 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 256 /* 257 * If the incoming datagram is for MLD, allow it 258 * through unconditionally to the raw socket. 259 * 260 * Use the M_RTALERT_MLD flag to check for MLD 261 * traffic without having to inspect the mbuf chain 262 * more deeply, as all MLDv1/v2 host messages MUST 263 * contain the Router Alert option. 264 * 265 * In the case of MLDv1, we may not have explicitly 266 * joined the group, and may have set IFF_ALLMULTI 267 * on the interface. im6o_mc_filter() may discard 268 * control traffic we actually need to see. 269 * 270 * Userland multicast routing daemons should continue 271 * filter the control traffic appropriately. 272 */ 273 int blocked; 274 275 blocked = MCAST_PASS; 276 if ((m->m_flags & M_RTALERT_MLD) == 0) { 277 struct sockaddr_in6 mcaddr; 278 279 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 280 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 281 mcaddr.sin6_family = AF_INET6; 282 mcaddr.sin6_addr = ip6->ip6_dst; 283 284 blocked = im6o_mc_filter(in6p->in6p_moptions, 285 ifp, 286 (struct sockaddr *)&mcaddr, 287 (struct sockaddr *)&fromsa); 288 } 289 if (blocked != MCAST_PASS) { 290 IP6STAT_INC(ip6s_notmember); 291 goto skip_2; 292 } 293 } 294 last = in6p; 295 continue; 296 skip_2: 297 INP_RUNLOCK(in6p); 298 } 299 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et); 300 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 301 /* 302 * Check AH/ESP integrity. 303 */ 304 if (IPSEC_ENABLED(ipv6) && last != NULL && 305 IPSEC_CHECK_POLICY(ipv6, m, last) != 0) { 306 m_freem(m); 307 IP6STAT_DEC(ip6s_delivered); 308 /* Do not inject data into pcb. */ 309 INP_RUNLOCK(last); 310 } else 311 #endif /* IPSEC */ 312 if (last != NULL) { 313 if (last->inp_flags & INP_CONTROLOPTS || 314 last->inp_socket->so_options & SO_TIMESTAMP) 315 ip6_savecontrol(last, m, &opts); 316 /* Strip intermediate headers. */ 317 m_adj(m, *offp); 318 if (sbappendaddr(&last->inp_socket->so_rcv, 319 (struct sockaddr *)&fromsa, m, opts) == 0) { 320 m_freem(m); 321 if (opts) 322 m_freem(opts); 323 RIP6STAT_INC(rip6s_fullsock); 324 } else 325 sorwakeup(last->inp_socket); 326 INP_RUNLOCK(last); 327 } else { 328 RIP6STAT_INC(rip6s_nosock); 329 if (m->m_flags & M_MCAST) 330 RIP6STAT_INC(rip6s_nosockmcast); 331 if (proto == IPPROTO_NONE) 332 m_freem(m); 333 else 334 icmp6_error(m, ICMP6_PARAM_PROB, 335 ICMP6_PARAMPROB_NEXTHEADER, 336 ip6_get_prevhdr(m, *offp)); 337 IP6STAT_DEC(ip6s_delivered); 338 } 339 return (IPPROTO_DONE); 340 } 341 342 void 343 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d) 344 { 345 struct ip6ctlparam *ip6cp = NULL; 346 const struct sockaddr_in6 *sa6_src = NULL; 347 void *cmdarg; 348 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange; 349 350 if (sa->sa_family != AF_INET6 || 351 sa->sa_len != sizeof(struct sockaddr_in6)) 352 return; 353 354 if ((unsigned)cmd >= PRC_NCMDS) 355 return; 356 if (PRC_IS_REDIRECT(cmd)) 357 notify = in6_rtchange, d = NULL; 358 else if (cmd == PRC_HOSTDEAD) 359 d = NULL; 360 else if (inet6ctlerrmap[cmd] == 0) 361 return; 362 363 /* 364 * If the parameter is from icmp6, decode it. 365 */ 366 if (d != NULL) { 367 ip6cp = (struct ip6ctlparam *)d; 368 cmdarg = ip6cp->ip6c_cmdarg; 369 sa6_src = ip6cp->ip6c_src; 370 } else { 371 cmdarg = NULL; 372 sa6_src = &sa6_any; 373 } 374 375 (void) in6_pcbnotify(&V_ripcbinfo, sa, 0, 376 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 377 } 378 379 /* 380 * Generate IPv6 header and pass packet to ip6_output. Tack on options user 381 * may have setup with control call. 382 */ 383 int 384 rip6_output(struct mbuf *m, struct socket *so, ...) 385 { 386 struct mbuf *control; 387 struct m_tag *mtag; 388 struct sockaddr_in6 *dstsock; 389 struct ip6_hdr *ip6; 390 struct inpcb *in6p; 391 u_int plen = m->m_pkthdr.len; 392 int error = 0; 393 struct ip6_pktopts opt, *optp; 394 struct ifnet *oifp = NULL; 395 int type = 0, code = 0; /* for ICMPv6 output statistics only */ 396 int scope_ambiguous = 0; 397 int use_defzone = 0; 398 int hlim = 0; 399 struct in6_addr in6a; 400 va_list ap; 401 402 va_start(ap, so); 403 dstsock = va_arg(ap, struct sockaddr_in6 *); 404 control = va_arg(ap, struct mbuf *); 405 va_end(ap); 406 407 in6p = sotoinpcb(so); 408 INP_WLOCK(in6p); 409 410 if (control != NULL) { 411 if ((error = ip6_setpktopts(control, &opt, 412 in6p->in6p_outputopts, so->so_cred, 413 so->so_proto->pr_protocol)) != 0) { 414 goto bad; 415 } 416 optp = &opt; 417 } else 418 optp = in6p->in6p_outputopts; 419 420 /* 421 * Check and convert scope zone ID into internal form. 422 * 423 * XXX: we may still need to determine the zone later. 424 */ 425 if (!(so->so_state & SS_ISCONNECTED)) { 426 if (!optp || !optp->ip6po_pktinfo || 427 !optp->ip6po_pktinfo->ipi6_ifindex) 428 use_defzone = V_ip6_use_defzone; 429 if (dstsock->sin6_scope_id == 0 && !use_defzone) 430 scope_ambiguous = 1; 431 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0) 432 goto bad; 433 } 434 435 /* 436 * For an ICMPv6 packet, we should know its type and code to update 437 * statistics. 438 */ 439 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 440 struct icmp6_hdr *icmp6; 441 if (m->m_len < sizeof(struct icmp6_hdr) && 442 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { 443 error = ENOBUFS; 444 goto bad; 445 } 446 icmp6 = mtod(m, struct icmp6_hdr *); 447 type = icmp6->icmp6_type; 448 code = icmp6->icmp6_code; 449 } 450 451 M_PREPEND(m, sizeof(*ip6), M_NOWAIT); 452 if (m == NULL) { 453 error = ENOBUFS; 454 goto bad; 455 } 456 ip6 = mtod(m, struct ip6_hdr *); 457 458 /* 459 * Source address selection. 460 */ 461 error = in6_selectsrc_socket(dstsock, optp, in6p, so->so_cred, 462 scope_ambiguous, &in6a, &hlim); 463 464 if (error) 465 goto bad; 466 error = prison_check_ip6(in6p->inp_cred, &in6a); 467 if (error != 0) 468 goto bad; 469 ip6->ip6_src = in6a; 470 471 ip6->ip6_dst = dstsock->sin6_addr; 472 473 /* 474 * Fill in the rest of the IPv6 header fields. 475 */ 476 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | 477 (in6p->inp_flow & IPV6_FLOWINFO_MASK); 478 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | 479 (IPV6_VERSION & IPV6_VERSION_MASK); 480 481 /* 482 * ip6_plen will be filled in ip6_output, so not fill it here. 483 */ 484 ip6->ip6_nxt = in6p->inp_ip_p; 485 ip6->ip6_hlim = hlim; 486 487 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 || 488 in6p->in6p_cksum != -1) { 489 struct mbuf *n; 490 int off; 491 u_int16_t *p; 492 493 /* Compute checksum. */ 494 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 495 off = offsetof(struct icmp6_hdr, icmp6_cksum); 496 else 497 off = in6p->in6p_cksum; 498 if (plen < off + 1) { 499 error = EINVAL; 500 goto bad; 501 } 502 off += sizeof(struct ip6_hdr); 503 504 n = m; 505 while (n && n->m_len <= off) { 506 off -= n->m_len; 507 n = n->m_next; 508 } 509 if (!n) 510 goto bad; 511 p = (u_int16_t *)(mtod(n, caddr_t) + off); 512 *p = 0; 513 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen); 514 } 515 516 /* 517 * Send RA/RS messages to user land for protection, before sending 518 * them to rtadvd/rtsol. 519 */ 520 if ((send_sendso_input_hook != NULL) && 521 so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 522 switch (type) { 523 case ND_ROUTER_ADVERT: 524 case ND_ROUTER_SOLICIT: 525 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, 526 sizeof(unsigned short), M_NOWAIT); 527 if (mtag == NULL) 528 goto bad; 529 m_tag_prepend(m, mtag); 530 } 531 } 532 533 error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p); 534 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 535 if (oifp) 536 icmp6_ifoutstat_inc(oifp, type, code); 537 ICMP6STAT_INC(icp6s_outhist[type]); 538 } else 539 RIP6STAT_INC(rip6s_opackets); 540 541 goto freectl; 542 543 bad: 544 if (m) 545 m_freem(m); 546 547 freectl: 548 if (control != NULL) { 549 ip6_clearpktopts(&opt, -1); 550 m_freem(control); 551 } 552 INP_WUNLOCK(in6p); 553 return (error); 554 } 555 556 /* 557 * Raw IPv6 socket option processing. 558 */ 559 int 560 rip6_ctloutput(struct socket *so, struct sockopt *sopt) 561 { 562 struct inpcb *inp; 563 int error; 564 565 if (sopt->sopt_level == IPPROTO_ICMPV6) 566 /* 567 * XXX: is it better to call icmp6_ctloutput() directly 568 * from protosw? 569 */ 570 return (icmp6_ctloutput(so, sopt)); 571 else if (sopt->sopt_level != IPPROTO_IPV6) { 572 if (sopt->sopt_level == SOL_SOCKET && 573 sopt->sopt_name == SO_SETFIB) { 574 inp = sotoinpcb(so); 575 INP_WLOCK(inp); 576 inp->inp_inc.inc_fibnum = so->so_fibnum; 577 INP_WUNLOCK(inp); 578 return (0); 579 } 580 return (EINVAL); 581 } 582 583 error = 0; 584 585 switch (sopt->sopt_dir) { 586 case SOPT_GET: 587 switch (sopt->sopt_name) { 588 case MRT6_INIT: 589 case MRT6_DONE: 590 case MRT6_ADD_MIF: 591 case MRT6_DEL_MIF: 592 case MRT6_ADD_MFC: 593 case MRT6_DEL_MFC: 594 case MRT6_PIM: 595 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) : 596 EOPNOTSUPP; 597 break; 598 case IPV6_CHECKSUM: 599 error = ip6_raw_ctloutput(so, sopt); 600 break; 601 default: 602 error = ip6_ctloutput(so, sopt); 603 break; 604 } 605 break; 606 607 case SOPT_SET: 608 switch (sopt->sopt_name) { 609 case MRT6_INIT: 610 case MRT6_DONE: 611 case MRT6_ADD_MIF: 612 case MRT6_DEL_MIF: 613 case MRT6_ADD_MFC: 614 case MRT6_DEL_MFC: 615 case MRT6_PIM: 616 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) : 617 EOPNOTSUPP; 618 break; 619 case IPV6_CHECKSUM: 620 error = ip6_raw_ctloutput(so, sopt); 621 break; 622 default: 623 error = ip6_ctloutput(so, sopt); 624 break; 625 } 626 break; 627 } 628 629 return (error); 630 } 631 632 static int 633 rip6_attach(struct socket *so, int proto, struct thread *td) 634 { 635 struct inpcb *inp; 636 struct icmp6_filter *filter; 637 int error; 638 639 inp = sotoinpcb(so); 640 KASSERT(inp == NULL, ("rip6_attach: inp != NULL")); 641 642 error = priv_check(td, PRIV_NETINET_RAW); 643 if (error) 644 return (error); 645 error = soreserve(so, rip_sendspace, rip_recvspace); 646 if (error) 647 return (error); 648 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT); 649 if (filter == NULL) 650 return (ENOMEM); 651 INP_INFO_WLOCK(&V_ripcbinfo); 652 error = in_pcballoc(so, &V_ripcbinfo); 653 if (error) { 654 INP_INFO_WUNLOCK(&V_ripcbinfo); 655 free(filter, M_PCB); 656 return (error); 657 } 658 inp = (struct inpcb *)so->so_pcb; 659 INP_INFO_WUNLOCK(&V_ripcbinfo); 660 inp->inp_vflag |= INP_IPV6; 661 inp->inp_ip_p = (long)proto; 662 inp->in6p_hops = -1; /* use kernel default */ 663 inp->in6p_cksum = -1; 664 inp->in6p_icmp6filt = filter; 665 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); 666 INP_WUNLOCK(inp); 667 return (0); 668 } 669 670 static void 671 rip6_detach(struct socket *so) 672 { 673 struct inpcb *inp; 674 675 inp = sotoinpcb(so); 676 KASSERT(inp != NULL, ("rip6_detach: inp == NULL")); 677 678 if (so == V_ip6_mrouter && ip6_mrouter_done) 679 ip6_mrouter_done(); 680 /* xxx: RSVP */ 681 INP_INFO_WLOCK(&V_ripcbinfo); 682 INP_WLOCK(inp); 683 free(inp->in6p_icmp6filt, M_PCB); 684 in_pcbdetach(inp); 685 in_pcbfree(inp); 686 INP_INFO_WUNLOCK(&V_ripcbinfo); 687 } 688 689 /* XXXRW: This can't ever be called. */ 690 static void 691 rip6_abort(struct socket *so) 692 { 693 struct inpcb *inp; 694 695 inp = sotoinpcb(so); 696 KASSERT(inp != NULL, ("rip6_abort: inp == NULL")); 697 698 soisdisconnected(so); 699 } 700 701 static void 702 rip6_close(struct socket *so) 703 { 704 struct inpcb *inp; 705 706 inp = sotoinpcb(so); 707 KASSERT(inp != NULL, ("rip6_close: inp == NULL")); 708 709 soisdisconnected(so); 710 } 711 712 static int 713 rip6_disconnect(struct socket *so) 714 { 715 struct inpcb *inp; 716 717 inp = sotoinpcb(so); 718 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL")); 719 720 if ((so->so_state & SS_ISCONNECTED) == 0) 721 return (ENOTCONN); 722 inp->in6p_faddr = in6addr_any; 723 rip6_abort(so); 724 return (0); 725 } 726 727 static int 728 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 729 { 730 struct epoch_tracker et; 731 struct inpcb *inp; 732 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam; 733 struct ifaddr *ifa = NULL; 734 int error = 0; 735 736 inp = sotoinpcb(so); 737 KASSERT(inp != NULL, ("rip6_bind: inp == NULL")); 738 739 if (nam->sa_len != sizeof(*addr)) 740 return (EINVAL); 741 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0) 742 return (error); 743 if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6) 744 return (EADDRNOTAVAIL); 745 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0) 746 return (error); 747 748 NET_EPOCH_ENTER(et); 749 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) && 750 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) { 751 NET_EPOCH_EXIT(et); 752 return (EADDRNOTAVAIL); 753 } 754 if (ifa != NULL && 755 ((struct in6_ifaddr *)ifa)->ia6_flags & 756 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 757 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 758 NET_EPOCH_EXIT(et); 759 return (EADDRNOTAVAIL); 760 } 761 NET_EPOCH_EXIT(et); 762 INP_INFO_WLOCK(&V_ripcbinfo); 763 INP_WLOCK(inp); 764 inp->in6p_laddr = addr->sin6_addr; 765 INP_WUNLOCK(inp); 766 INP_INFO_WUNLOCK(&V_ripcbinfo); 767 return (0); 768 } 769 770 static int 771 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 772 { 773 struct inpcb *inp; 774 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam; 775 struct in6_addr in6a; 776 int error = 0, scope_ambiguous = 0; 777 778 inp = sotoinpcb(so); 779 KASSERT(inp != NULL, ("rip6_connect: inp == NULL")); 780 781 if (nam->sa_len != sizeof(*addr)) 782 return (EINVAL); 783 if (CK_STAILQ_EMPTY(&V_ifnet)) 784 return (EADDRNOTAVAIL); 785 if (addr->sin6_family != AF_INET6) 786 return (EAFNOSUPPORT); 787 788 /* 789 * Application should provide a proper zone ID or the use of default 790 * zone IDs should be enabled. Unfortunately, some applications do 791 * not behave as it should, so we need a workaround. Even if an 792 * appropriate ID is not determined, we'll see if we can determine 793 * the outgoing interface. If we can, determine the zone ID based on 794 * the interface below. 795 */ 796 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone) 797 scope_ambiguous = 1; 798 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0) 799 return (error); 800 801 INP_INFO_WLOCK(&V_ripcbinfo); 802 INP_WLOCK(inp); 803 /* Source address selection. XXX: need pcblookup? */ 804 error = in6_selectsrc_socket(addr, inp->in6p_outputopts, 805 inp, so->so_cred, scope_ambiguous, &in6a, NULL); 806 if (error) { 807 INP_WUNLOCK(inp); 808 INP_INFO_WUNLOCK(&V_ripcbinfo); 809 return (error); 810 } 811 812 inp->in6p_faddr = addr->sin6_addr; 813 inp->in6p_laddr = in6a; 814 soisconnected(so); 815 INP_WUNLOCK(inp); 816 INP_INFO_WUNLOCK(&V_ripcbinfo); 817 return (0); 818 } 819 820 static int 821 rip6_shutdown(struct socket *so) 822 { 823 struct inpcb *inp; 824 825 inp = sotoinpcb(so); 826 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL")); 827 828 INP_WLOCK(inp); 829 socantsendmore(so); 830 INP_WUNLOCK(inp); 831 return (0); 832 } 833 834 static int 835 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 836 struct mbuf *control, struct thread *td) 837 { 838 struct inpcb *inp; 839 struct sockaddr_in6 tmp; 840 struct sockaddr_in6 *dst; 841 int ret; 842 843 inp = sotoinpcb(so); 844 KASSERT(inp != NULL, ("rip6_send: inp == NULL")); 845 846 /* Always copy sockaddr to avoid overwrites. */ 847 /* Unlocked read. */ 848 if (so->so_state & SS_ISCONNECTED) { 849 if (nam) { 850 m_freem(m); 851 return (EISCONN); 852 } 853 /* XXX */ 854 bzero(&tmp, sizeof(tmp)); 855 tmp.sin6_family = AF_INET6; 856 tmp.sin6_len = sizeof(struct sockaddr_in6); 857 INP_RLOCK(inp); 858 bcopy(&inp->in6p_faddr, &tmp.sin6_addr, 859 sizeof(struct in6_addr)); 860 INP_RUNLOCK(inp); 861 dst = &tmp; 862 } else { 863 if (nam == NULL) { 864 m_freem(m); 865 return (ENOTCONN); 866 } 867 if (nam->sa_len != sizeof(struct sockaddr_in6)) { 868 m_freem(m); 869 return (EINVAL); 870 } 871 tmp = *(struct sockaddr_in6 *)nam; 872 dst = &tmp; 873 874 if (dst->sin6_family == AF_UNSPEC) { 875 /* 876 * XXX: we allow this case for backward 877 * compatibility to buggy applications that 878 * rely on old (and wrong) kernel behavior. 879 */ 880 log(LOG_INFO, "rip6 SEND: address family is " 881 "unspec. Assume AF_INET6\n"); 882 dst->sin6_family = AF_INET6; 883 } else if (dst->sin6_family != AF_INET6) { 884 m_freem(m); 885 return(EAFNOSUPPORT); 886 } 887 } 888 ret = rip6_output(m, so, dst, control); 889 return (ret); 890 } 891 892 struct pr_usrreqs rip6_usrreqs = { 893 .pru_abort = rip6_abort, 894 .pru_attach = rip6_attach, 895 .pru_bind = rip6_bind, 896 .pru_connect = rip6_connect, 897 .pru_control = in6_control, 898 .pru_detach = rip6_detach, 899 .pru_disconnect = rip6_disconnect, 900 .pru_peeraddr = in6_getpeeraddr, 901 .pru_send = rip6_send, 902 .pru_shutdown = rip6_shutdown, 903 .pru_sockaddr = in6_getsockaddr, 904 .pru_close = rip6_close, 905 }; 906