Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/raw_ip6.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /*- 31 * Copyright (c) 1982, 1986, 1988, 1993 32 * The Regents of the University of California. 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 4. Neither the name of the University nor the names of its contributors 44 * may be used to endorse or promote products derived from this software 45 * without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 50 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 57 * SUCH DAMAGE. 58 * 59 * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94 60 */ 61 62 #include <sys/cdefs.h> 63 __FBSDID("$FreeBSD$"); 64 65 #include "opt_ipsec.h" 66 #include "opt_inet6.h" 67 68 #include <sys/param.h> 69 #include <sys/errno.h> 70 #include <sys/jail.h> 71 #include <sys/lock.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/priv.h> 75 #include <sys/proc.h> 76 #include <sys/protosw.h> 77 #include <sys/signalvar.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/sx.h> 81 #include <sys/syslog.h> 82 83 #include <net/if.h> 84 #include <net/if_types.h> 85 #include <net/route.h> 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/in_systm.h> 90 #include <netinet/icmp6.h> 91 #include <netinet/in_pcb.h> 92 #include <netinet/ip6.h> 93 #include <netinet6/ip6protosw.h> 94 #include <netinet6/ip6_mroute.h> 95 #include <netinet6/in6_pcb.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/nd6.h> 98 #include <netinet6/raw_ip6.h> 99 #include <netinet6/scope6_var.h> 100 101 #ifdef IPSEC 102 #include <netipsec/ipsec.h> 103 #include <netipsec/ipsec6.h> 104 #endif /* IPSEC */ 105 106 #include <machine/stdarg.h> 107 108 #define satosin6(sa) ((struct sockaddr_in6 *)(sa)) 109 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 110 111 /* 112 * Raw interface to IP6 protocol. 113 */ 114 115 extern struct inpcbhead ripcb; 116 extern struct inpcbinfo ripcbinfo; 117 extern u_long rip_sendspace; 118 extern u_long rip_recvspace; 119 120 struct rip6stat rip6stat; 121 122 /* 123 * Hooks for multicast forwarding. 124 */ 125 struct socket *ip6_mrouter = NULL; 126 int (*ip6_mrouter_set)(struct socket *, struct sockopt *); 127 int (*ip6_mrouter_get)(struct socket *, struct sockopt *); 128 int (*ip6_mrouter_done)(void); 129 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *); 130 int (*mrt6_ioctl)(int, caddr_t); 131 132 /* 133 * Setup generic address and protocol structures for raw_input routine, then 134 * pass them along with mbuf chain. 135 */ 136 int 137 rip6_input(struct mbuf **mp, int *offp, int proto) 138 { 139 struct mbuf *m = *mp; 140 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 141 register struct inpcb *in6p; 142 struct inpcb *last = 0; 143 struct mbuf *opts = NULL; 144 struct sockaddr_in6 fromsa; 145 146 rip6stat.rip6s_ipackets++; 147 148 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 149 /* XXX Send icmp6 host/port unreach? */ 150 m_freem(m); 151 return (IPPROTO_DONE); 152 } 153 154 init_sin6(&fromsa, m); /* general init */ 155 156 INP_INFO_RLOCK(&ripcbinfo); 157 LIST_FOREACH(in6p, &ripcb, inp_list) { 158 /* XXX inp locking */ 159 if ((in6p->inp_vflag & INP_IPV6) == 0) 160 continue; 161 if (in6p->inp_ip_p && 162 in6p->inp_ip_p != proto) 163 continue; 164 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 165 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 166 continue; 167 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 168 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 169 continue; 170 if (prison_check_ip6(in6p->inp_cred, &ip6->ip6_dst) != 0) 171 continue; 172 INP_RLOCK(in6p); 173 if (in6p->in6p_cksum != -1) { 174 rip6stat.rip6s_isum++; 175 if (in6_cksum(m, proto, *offp, 176 m->m_pkthdr.len - *offp)) { 177 INP_RUNLOCK(in6p); 178 rip6stat.rip6s_badsum++; 179 continue; 180 } 181 } 182 if (last) { 183 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 184 185 #ifdef IPSEC 186 /* 187 * Check AH/ESP integrity. 188 */ 189 if (n && ipsec6_in_reject(n, last)) { 190 m_freem(n); 191 ipsec6stat.in_polvio++; 192 /* Do not inject data into pcb. */ 193 } else 194 #endif /* IPSEC */ 195 if (n) { 196 if (last->inp_flags & INP_CONTROLOPTS || 197 last->inp_socket->so_options & SO_TIMESTAMP) 198 ip6_savecontrol(last, n, &opts); 199 /* strip intermediate headers */ 200 m_adj(n, *offp); 201 if (sbappendaddr(&last->inp_socket->so_rcv, 202 (struct sockaddr *)&fromsa, 203 n, opts) == 0) { 204 m_freem(n); 205 if (opts) 206 m_freem(opts); 207 rip6stat.rip6s_fullsock++; 208 } else 209 sorwakeup(last->inp_socket); 210 opts = NULL; 211 } 212 INP_RUNLOCK(last); 213 } 214 last = in6p; 215 } 216 INP_INFO_RUNLOCK(&ripcbinfo); 217 #ifdef IPSEC 218 /* 219 * Check AH/ESP integrity. 220 */ 221 if (last && ipsec6_in_reject(m, last)) { 222 m_freem(m); 223 ipsec6stat.in_polvio++; 224 ip6stat.ip6s_delivered--; 225 /* Do not inject data into pcb. */ 226 INP_RUNLOCK(last); 227 } else 228 #endif /* IPSEC */ 229 if (last) { 230 if (last->inp_flags & INP_CONTROLOPTS || 231 last->inp_socket->so_options & SO_TIMESTAMP) 232 ip6_savecontrol(last, m, &opts); 233 /* Strip intermediate headers. */ 234 m_adj(m, *offp); 235 if (sbappendaddr(&last->inp_socket->so_rcv, 236 (struct sockaddr *)&fromsa, m, opts) == 0) { 237 m_freem(m); 238 if (opts) 239 m_freem(opts); 240 rip6stat.rip6s_fullsock++; 241 } else 242 sorwakeup(last->inp_socket); 243 INP_RUNLOCK(last); 244 } else { 245 rip6stat.rip6s_nosock++; 246 if (m->m_flags & M_MCAST) 247 rip6stat.rip6s_nosockmcast++; 248 if (proto == IPPROTO_NONE) 249 m_freem(m); 250 else { 251 char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */ 252 icmp6_error(m, ICMP6_PARAM_PROB, 253 ICMP6_PARAMPROB_NEXTHEADER, 254 prvnxtp - mtod(m, char *)); 255 } 256 ip6stat.ip6s_delivered--; 257 } 258 return (IPPROTO_DONE); 259 } 260 261 void 262 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d) 263 { 264 struct ip6_hdr *ip6; 265 struct mbuf *m; 266 int off = 0; 267 struct ip6ctlparam *ip6cp = NULL; 268 const struct sockaddr_in6 *sa6_src = NULL; 269 void *cmdarg; 270 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange; 271 272 if (sa->sa_family != AF_INET6 || 273 sa->sa_len != sizeof(struct sockaddr_in6)) 274 return; 275 276 if ((unsigned)cmd >= PRC_NCMDS) 277 return; 278 if (PRC_IS_REDIRECT(cmd)) 279 notify = in6_rtchange, d = NULL; 280 else if (cmd == PRC_HOSTDEAD) 281 d = NULL; 282 else if (inet6ctlerrmap[cmd] == 0) 283 return; 284 285 /* 286 * If the parameter is from icmp6, decode it. 287 */ 288 if (d != NULL) { 289 ip6cp = (struct ip6ctlparam *)d; 290 m = ip6cp->ip6c_m; 291 ip6 = ip6cp->ip6c_ip6; 292 off = ip6cp->ip6c_off; 293 cmdarg = ip6cp->ip6c_cmdarg; 294 sa6_src = ip6cp->ip6c_src; 295 } else { 296 m = NULL; 297 ip6 = NULL; 298 cmdarg = NULL; 299 sa6_src = &sa6_any; 300 } 301 302 (void) in6_pcbnotify(&ripcbinfo, sa, 0, 303 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 304 } 305 306 /* 307 * Generate IPv6 header and pass packet to ip6_output. Tack on options user 308 * may have setup with control call. 309 */ 310 int 311 #if __STDC__ 312 rip6_output(struct mbuf *m, ...) 313 #else 314 rip6_output(m, va_alist) 315 struct mbuf *m; 316 va_dcl 317 #endif 318 { 319 struct mbuf *control; 320 struct socket *so; 321 struct sockaddr_in6 *dstsock; 322 struct in6_addr *dst; 323 struct ip6_hdr *ip6; 324 struct inpcb *in6p; 325 u_int plen = m->m_pkthdr.len; 326 int error = 0; 327 struct ip6_pktopts opt, *optp; 328 struct ifnet *oifp = NULL; 329 int type = 0, code = 0; /* for ICMPv6 output statistics only */ 330 int scope_ambiguous = 0; 331 struct in6_addr in6a; 332 va_list ap; 333 334 va_start(ap, m); 335 so = va_arg(ap, struct socket *); 336 dstsock = va_arg(ap, struct sockaddr_in6 *); 337 control = va_arg(ap, struct mbuf *); 338 va_end(ap); 339 340 in6p = sotoinpcb(so); 341 INP_WLOCK(in6p); 342 343 dst = &dstsock->sin6_addr; 344 if (control) { 345 if ((error = ip6_setpktopts(control, &opt, 346 in6p->in6p_outputopts, so->so_cred, 347 so->so_proto->pr_protocol)) != 0) { 348 goto bad; 349 } 350 optp = &opt; 351 } else 352 optp = in6p->in6p_outputopts; 353 354 /* 355 * Check and convert scope zone ID into internal form. 356 * 357 * XXX: we may still need to determine the zone later. 358 */ 359 if (!(so->so_state & SS_ISCONNECTED)) { 360 if (dstsock->sin6_scope_id == 0 && !ip6_use_defzone) 361 scope_ambiguous = 1; 362 if ((error = sa6_embedscope(dstsock, ip6_use_defzone)) != 0) 363 goto bad; 364 } 365 366 /* 367 * For an ICMPv6 packet, we should know its type and code to update 368 * statistics. 369 */ 370 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 371 struct icmp6_hdr *icmp6; 372 if (m->m_len < sizeof(struct icmp6_hdr) && 373 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { 374 error = ENOBUFS; 375 goto bad; 376 } 377 icmp6 = mtod(m, struct icmp6_hdr *); 378 type = icmp6->icmp6_type; 379 code = icmp6->icmp6_code; 380 } 381 382 M_PREPEND(m, sizeof(*ip6), M_DONTWAIT); 383 if (m == NULL) { 384 error = ENOBUFS; 385 goto bad; 386 } 387 ip6 = mtod(m, struct ip6_hdr *); 388 389 /* 390 * Source address selection. 391 */ 392 error = in6_selectsrc(dstsock, optp, in6p, NULL, so->so_cred, 393 &oifp, &in6a); 394 if (error) 395 goto bad; 396 error = prison_get_ip6(in6p->inp_cred, &in6a); 397 if (error != 0) 398 goto bad; 399 ip6->ip6_src = in6a; 400 401 if (oifp && scope_ambiguous) { 402 /* 403 * Application should provide a proper zone ID or the use of 404 * default zone IDs should be enabled. Unfortunately, some 405 * applications do not behave as it should, so we need a 406 * workaround. Even if an appropriate ID is not determined 407 * (when it's required), if we can determine the outgoing 408 * interface. determine the zone ID based on the interface. 409 */ 410 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL); 411 if (error != 0) 412 goto bad; 413 } 414 ip6->ip6_dst = dstsock->sin6_addr; 415 416 /* 417 * Fill in the rest of the IPv6 header fields. 418 */ 419 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | 420 (in6p->inp_flow & IPV6_FLOWINFO_MASK); 421 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | 422 (IPV6_VERSION & IPV6_VERSION_MASK); 423 424 /* 425 * ip6_plen will be filled in ip6_output, so not fill it here. 426 */ 427 ip6->ip6_nxt = in6p->inp_ip_p; 428 ip6->ip6_hlim = in6_selecthlim(in6p, oifp); 429 430 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 || 431 in6p->in6p_cksum != -1) { 432 struct mbuf *n; 433 int off; 434 u_int16_t *p; 435 436 /* Compute checksum. */ 437 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 438 off = offsetof(struct icmp6_hdr, icmp6_cksum); 439 else 440 off = in6p->in6p_cksum; 441 if (plen < off + 1) { 442 error = EINVAL; 443 goto bad; 444 } 445 off += sizeof(struct ip6_hdr); 446 447 n = m; 448 while (n && n->m_len <= off) { 449 off -= n->m_len; 450 n = n->m_next; 451 } 452 if (!n) 453 goto bad; 454 p = (u_int16_t *)(mtod(n, caddr_t) + off); 455 *p = 0; 456 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen); 457 } 458 459 error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p); 460 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 461 if (oifp) 462 icmp6_ifoutstat_inc(oifp, type, code); 463 icmp6stat.icp6s_outhist[type]++; 464 } else 465 rip6stat.rip6s_opackets++; 466 467 goto freectl; 468 469 bad: 470 if (m) 471 m_freem(m); 472 473 freectl: 474 if (control) { 475 ip6_clearpktopts(&opt, -1); 476 m_freem(control); 477 } 478 INP_WUNLOCK(in6p); 479 return (error); 480 } 481 482 /* 483 * Raw IPv6 socket option processing. 484 */ 485 int 486 rip6_ctloutput(struct socket *so, struct sockopt *sopt) 487 { 488 int error; 489 490 if (sopt->sopt_level == IPPROTO_ICMPV6) 491 /* 492 * XXX: is it better to call icmp6_ctloutput() directly 493 * from protosw? 494 */ 495 return (icmp6_ctloutput(so, sopt)); 496 else if (sopt->sopt_level != IPPROTO_IPV6) 497 return (EINVAL); 498 499 error = 0; 500 501 switch (sopt->sopt_dir) { 502 case SOPT_GET: 503 switch (sopt->sopt_name) { 504 case MRT6_INIT: 505 case MRT6_DONE: 506 case MRT6_ADD_MIF: 507 case MRT6_DEL_MIF: 508 case MRT6_ADD_MFC: 509 case MRT6_DEL_MFC: 510 case MRT6_PIM: 511 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) : 512 EOPNOTSUPP; 513 break; 514 case IPV6_CHECKSUM: 515 error = ip6_raw_ctloutput(so, sopt); 516 break; 517 default: 518 error = ip6_ctloutput(so, sopt); 519 break; 520 } 521 break; 522 523 case SOPT_SET: 524 switch (sopt->sopt_name) { 525 case MRT6_INIT: 526 case MRT6_DONE: 527 case MRT6_ADD_MIF: 528 case MRT6_DEL_MIF: 529 case MRT6_ADD_MFC: 530 case MRT6_DEL_MFC: 531 case MRT6_PIM: 532 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) : 533 EOPNOTSUPP; 534 break; 535 case IPV6_CHECKSUM: 536 error = ip6_raw_ctloutput(so, sopt); 537 break; 538 default: 539 error = ip6_ctloutput(so, sopt); 540 break; 541 } 542 break; 543 } 544 545 return (error); 546 } 547 548 static int 549 rip6_attach(struct socket *so, int proto, struct thread *td) 550 { 551 struct inpcb *inp; 552 struct icmp6_filter *filter; 553 int error; 554 555 inp = sotoinpcb(so); 556 KASSERT(inp == NULL, ("rip6_attach: inp != NULL")); 557 558 error = priv_check(td, PRIV_NETINET_RAW); 559 if (error) 560 return (error); 561 error = soreserve(so, rip_sendspace, rip_recvspace); 562 if (error) 563 return (error); 564 MALLOC(filter, struct icmp6_filter *, 565 sizeof(struct icmp6_filter), M_PCB, M_NOWAIT); 566 if (filter == NULL) 567 return (ENOMEM); 568 INP_INFO_WLOCK(&ripcbinfo); 569 error = in_pcballoc(so, &ripcbinfo); 570 if (error) { 571 INP_INFO_WUNLOCK(&ripcbinfo); 572 FREE(filter, M_PCB); 573 return (error); 574 } 575 inp = (struct inpcb *)so->so_pcb; 576 INP_INFO_WUNLOCK(&ripcbinfo); 577 inp->inp_vflag |= INP_IPV6; 578 inp->inp_ip_p = (long)proto; 579 inp->in6p_hops = -1; /* use kernel default */ 580 inp->in6p_cksum = -1; 581 inp->in6p_icmp6filt = filter; 582 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); 583 INP_WUNLOCK(inp); 584 return (0); 585 } 586 587 static void 588 rip6_detach(struct socket *so) 589 { 590 struct inpcb *inp; 591 592 inp = sotoinpcb(so); 593 KASSERT(inp != NULL, ("rip6_detach: inp == NULL")); 594 595 if (so == ip6_mrouter && ip6_mrouter_done) 596 ip6_mrouter_done(); 597 /* xxx: RSVP */ 598 INP_INFO_WLOCK(&ripcbinfo); 599 INP_WLOCK(inp); 600 FREE(inp->in6p_icmp6filt, M_PCB); 601 in_pcbdetach(inp); 602 in_pcbfree(inp); 603 INP_INFO_WUNLOCK(&ripcbinfo); 604 } 605 606 /* XXXRW: This can't ever be called. */ 607 static void 608 rip6_abort(struct socket *so) 609 { 610 struct inpcb *inp; 611 612 inp = sotoinpcb(so); 613 KASSERT(inp != NULL, ("rip6_abort: inp == NULL")); 614 615 soisdisconnected(so); 616 } 617 618 static void 619 rip6_close(struct socket *so) 620 { 621 struct inpcb *inp; 622 623 inp = sotoinpcb(so); 624 KASSERT(inp != NULL, ("rip6_close: inp == NULL")); 625 626 soisdisconnected(so); 627 } 628 629 static int 630 rip6_disconnect(struct socket *so) 631 { 632 struct inpcb *inp; 633 634 inp = sotoinpcb(so); 635 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL")); 636 637 if ((so->so_state & SS_ISCONNECTED) == 0) 638 return (ENOTCONN); 639 inp->in6p_faddr = in6addr_any; 640 rip6_abort(so); 641 return (0); 642 } 643 644 static int 645 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 646 { 647 struct inpcb *inp; 648 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam; 649 struct ifaddr *ia = NULL; 650 int error = 0; 651 652 inp = sotoinpcb(so); 653 KASSERT(inp != NULL, ("rip6_bind: inp == NULL")); 654 655 if (nam->sa_len != sizeof(*addr)) 656 return (EINVAL); 657 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0) 658 return (error); 659 if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6) 660 return (EADDRNOTAVAIL); 661 if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0) 662 return (error); 663 664 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) && 665 (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0) 666 return (EADDRNOTAVAIL); 667 if (ia && 668 ((struct in6_ifaddr *)ia)->ia6_flags & 669 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 670 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 671 return (EADDRNOTAVAIL); 672 } 673 INP_INFO_WLOCK(&ripcbinfo); 674 INP_WLOCK(inp); 675 inp->in6p_laddr = addr->sin6_addr; 676 INP_WUNLOCK(inp); 677 INP_INFO_WUNLOCK(&ripcbinfo); 678 return (0); 679 } 680 681 static int 682 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 683 { 684 struct inpcb *inp; 685 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam; 686 struct in6_addr in6a; 687 struct ifnet *ifp = NULL; 688 int error = 0, scope_ambiguous = 0; 689 690 inp = sotoinpcb(so); 691 KASSERT(inp != NULL, ("rip6_connect: inp == NULL")); 692 693 if (nam->sa_len != sizeof(*addr)) 694 return (EINVAL); 695 if (TAILQ_EMPTY(&ifnet)) 696 return (EADDRNOTAVAIL); 697 if (addr->sin6_family != AF_INET6) 698 return (EAFNOSUPPORT); 699 700 /* 701 * Application should provide a proper zone ID or the use of default 702 * zone IDs should be enabled. Unfortunately, some applications do 703 * not behave as it should, so we need a workaround. Even if an 704 * appropriate ID is not determined, we'll see if we can determine 705 * the outgoing interface. If we can, determine the zone ID based on 706 * the interface below. 707 */ 708 if (addr->sin6_scope_id == 0 && !ip6_use_defzone) 709 scope_ambiguous = 1; 710 if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0) 711 return (error); 712 713 INP_INFO_WLOCK(&ripcbinfo); 714 INP_WLOCK(inp); 715 /* Source address selection. XXX: need pcblookup? */ 716 error = in6_selectsrc(addr, inp->in6p_outputopts, 717 inp, NULL, so->so_cred, &ifp, &in6a); 718 if (error) { 719 INP_WUNLOCK(inp); 720 INP_INFO_WUNLOCK(&ripcbinfo); 721 return (error); 722 } 723 724 /* XXX: see above */ 725 if (ifp && scope_ambiguous && 726 (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) { 727 INP_WUNLOCK(inp); 728 INP_INFO_WUNLOCK(&ripcbinfo); 729 return (error); 730 } 731 inp->in6p_faddr = addr->sin6_addr; 732 inp->in6p_laddr = in6a; 733 soisconnected(so); 734 INP_WUNLOCK(inp); 735 INP_INFO_WUNLOCK(&ripcbinfo); 736 return (0); 737 } 738 739 static int 740 rip6_shutdown(struct socket *so) 741 { 742 struct inpcb *inp; 743 744 inp = sotoinpcb(so); 745 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL")); 746 747 INP_WLOCK(inp); 748 socantsendmore(so); 749 INP_WUNLOCK(inp); 750 return (0); 751 } 752 753 static int 754 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 755 struct mbuf *control, struct thread *td) 756 { 757 struct inpcb *inp; 758 struct sockaddr_in6 tmp; 759 struct sockaddr_in6 *dst; 760 int ret; 761 762 inp = sotoinpcb(so); 763 KASSERT(inp != NULL, ("rip6_send: inp == NULL")); 764 765 /* Always copy sockaddr to avoid overwrites. */ 766 /* Unlocked read. */ 767 if (so->so_state & SS_ISCONNECTED) { 768 if (nam) { 769 m_freem(m); 770 return (EISCONN); 771 } 772 /* XXX */ 773 bzero(&tmp, sizeof(tmp)); 774 tmp.sin6_family = AF_INET6; 775 tmp.sin6_len = sizeof(struct sockaddr_in6); 776 INP_RLOCK(inp); 777 bcopy(&inp->in6p_faddr, &tmp.sin6_addr, 778 sizeof(struct in6_addr)); 779 INP_RUNLOCK(inp); 780 dst = &tmp; 781 } else { 782 if (nam == NULL) { 783 m_freem(m); 784 return (ENOTCONN); 785 } 786 if (nam->sa_len != sizeof(struct sockaddr_in6)) { 787 m_freem(m); 788 return (EINVAL); 789 } 790 tmp = *(struct sockaddr_in6 *)nam; 791 dst = &tmp; 792 793 if (dst->sin6_family == AF_UNSPEC) { 794 /* 795 * XXX: we allow this case for backward 796 * compatibility to buggy applications that 797 * rely on old (and wrong) kernel behavior. 798 */ 799 log(LOG_INFO, "rip6 SEND: address family is " 800 "unspec. Assume AF_INET6\n"); 801 dst->sin6_family = AF_INET6; 802 } else if (dst->sin6_family != AF_INET6) { 803 m_freem(m); 804 return(EAFNOSUPPORT); 805 } 806 } 807 ret = rip6_output(m, so, dst, control); 808 return (ret); 809 } 810 811 struct pr_usrreqs rip6_usrreqs = { 812 .pru_abort = rip6_abort, 813 .pru_attach = rip6_attach, 814 .pru_bind = rip6_bind, 815 .pru_connect = rip6_connect, 816 .pru_control = in6_control, 817 .pru_detach = rip6_detach, 818 .pru_disconnect = rip6_disconnect, 819 .pru_peeraddr = in6_getpeeraddr, 820 .pru_send = rip6_send, 821 .pru_shutdown = rip6_shutdown, 822 .pru_sockaddr = in6_getsockaddr, 823 .pru_close = rip6_close, 824 };
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