raw_ip6.c revision 1.99
1 /* $NetBSD: raw_ip6.c,v 1.99 2008/05/04 07:22:15 thorpej Exp $ */ 2 /* $KAME: raw_ip6.c,v 1.82 2001/07/23 18:57:56 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. 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 __KERNEL_RCSID(0, "$NetBSD: raw_ip6.c,v 1.99 2008/05/04 07:22:15 thorpej Exp $"); 66 67 #include "opt_ipsec.h" 68 69 #include <sys/param.h> 70 #include <sys/sysctl.h> 71 #include <sys/malloc.h> 72 #include <sys/mbuf.h> 73 #include <sys/socket.h> 74 #include <sys/protosw.h> 75 #include <sys/socketvar.h> 76 #include <sys/errno.h> 77 #include <sys/systm.h> 78 #include <sys/proc.h> 79 #include <sys/kauth.h> 80 81 #include <net/if.h> 82 #include <net/route.h> 83 #include <net/if_types.h> 84 #include <net/net_stats.h> 85 86 #include <netinet/in.h> 87 #include <netinet/in_var.h> 88 #include <netinet/ip6.h> 89 #include <netinet6/ip6_var.h> 90 #include <netinet6/ip6_private.h> 91 #include <netinet6/ip6_mroute.h> 92 #include <netinet/icmp6.h> 93 #include <netinet6/icmp6_private.h> 94 #include <netinet6/in6_pcb.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/ip6protosw.h> 97 #include <netinet6/scope6_var.h> 98 #include <netinet6/raw_ip6.h> 99 100 #ifdef IPSEC 101 #include <netinet6/ipsec.h> 102 #include <netinet6/ipsec_private.h> 103 #endif /* IPSEC */ 104 105 #ifdef FAST_IPSEC 106 #include <netipsec/ipsec.h> 107 #include <netipsec/ipsec_var.h> 108 #include <netipsec/ipsec_private.h> 109 #include <netipsec/ipsec6.h> 110 #endif 111 112 #include "faith.h" 113 #if defined(NFAITH) && 0 < NFAITH 114 #include <net/if_faith.h> 115 #endif 116 117 extern struct inpcbtable rawcbtable; 118 struct inpcbtable raw6cbtable; 119 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 120 121 /* 122 * Raw interface to IP6 protocol. 123 */ 124 125 static percpu_t *rip6stat_percpu; 126 127 #define RIP6_STATINC(x) _NET_STATINC(rip6stat_percpu, x) 128 129 /* 130 * Initialize raw connection block queue. 131 */ 132 void 133 rip6_init() 134 { 135 136 in6_pcbinit(&raw6cbtable, 1, 1); 137 138 rip6stat_percpu = percpu_alloc(sizeof(uint64_t) * RIP6_NSTATS); 139 } 140 141 /* 142 * Setup generic address and protocol structures 143 * for raw_input routine, then pass them along with 144 * mbuf chain. 145 */ 146 int 147 rip6_input(struct mbuf **mp, int *offp, int proto) 148 { 149 struct mbuf *m = *mp; 150 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 151 struct inpcb_hdr *inph; 152 struct in6pcb *in6p; 153 struct in6pcb *last = NULL; 154 struct sockaddr_in6 rip6src; 155 struct mbuf *opts = NULL; 156 157 RIP6_STATINC(RIP6_STAT_IPACKETS); 158 159 #if defined(NFAITH) && 0 < NFAITH 160 if (faithprefix(&ip6->ip6_dst)) { 161 /* send icmp6 host unreach? */ 162 m_freem(m); 163 return IPPROTO_DONE; 164 } 165 #endif 166 167 /* Be proactive about malicious use of IPv4 mapped address */ 168 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 169 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 170 /* XXX stat */ 171 m_freem(m); 172 return IPPROTO_DONE; 173 } 174 175 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 176 if (sa6_recoverscope(&rip6src) != 0) { 177 /* XXX: should be impossible. */ 178 m_freem(m); 179 return IPPROTO_DONE; 180 } 181 182 CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 183 in6p = (struct in6pcb *)inph; 184 if (in6p->in6p_af != AF_INET6) 185 continue; 186 if (in6p->in6p_ip6.ip6_nxt && 187 in6p->in6p_ip6.ip6_nxt != proto) 188 continue; 189 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 190 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 191 continue; 192 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 193 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 194 continue; 195 if (in6p->in6p_cksum != -1) { 196 RIP6_STATINC(RIP6_STAT_ISUM); 197 if (in6_cksum(m, proto, *offp, 198 m->m_pkthdr.len - *offp)) { 199 RIP6_STATINC(RIP6_STAT_BADSUM); 200 continue; 201 } 202 } 203 if (last) { 204 struct mbuf *n; 205 206 #ifdef IPSEC 207 /* 208 * Check AH/ESP integrity. 209 */ 210 if (ipsec6_in_reject(m, last)) { 211 IPSEC6_STATINC(IPSEC_STAT_IN_INVAL); 212 /* do not inject data into pcb */ 213 } else 214 #endif /* IPSEC */ 215 #ifdef FAST_IPSEC 216 /* 217 * Check AH/ESP integrity 218 */ 219 if (!ipsec6_in_reject(m,last)) 220 #endif /* FAST_IPSEC */ 221 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 222 if (last->in6p_flags & IN6P_CONTROLOPTS) 223 ip6_savecontrol(last, &opts, ip6, n); 224 /* strip intermediate headers */ 225 m_adj(n, *offp); 226 if (sbappendaddr(&last->in6p_socket->so_rcv, 227 (struct sockaddr *)&rip6src, n, opts) == 0) { 228 /* should notify about lost packet */ 229 m_freem(n); 230 if (opts) 231 m_freem(opts); 232 RIP6_STATINC(RIP6_STAT_FULLSOCK); 233 } else 234 sorwakeup(last->in6p_socket); 235 opts = NULL; 236 } 237 } 238 last = in6p; 239 } 240 #ifdef IPSEC 241 /* 242 * Check AH/ESP integrity. 243 */ 244 if (last && ipsec6_in_reject(m, last)) { 245 m_freem(m); 246 IPSEC6_STATINC(IPSEC_STAT_IN_INVAL); 247 IP6_STATDEC(IP6_STAT_DELIVERED); 248 /* do not inject data into pcb */ 249 } else 250 #endif /* IPSEC */ 251 #ifdef FAST_IPSEC 252 if (last && ipsec6_in_reject(m, last)) { 253 m_freem(m); 254 /* 255 * XXX ipsec6_in_reject update stat if there is an error 256 * so we just need to update stats by hand in the case of last is 257 * NULL 258 */ 259 if (!last) 260 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 261 IP6_STATDEC(IP6_STAT_DELIVERED); 262 /* do not inject data into pcb */ 263 } else 264 #endif /* FAST_IPSEC */ 265 if (last) { 266 if (last->in6p_flags & IN6P_CONTROLOPTS) 267 ip6_savecontrol(last, &opts, ip6, m); 268 /* strip intermediate headers */ 269 m_adj(m, *offp); 270 if (sbappendaddr(&last->in6p_socket->so_rcv, 271 (struct sockaddr *)&rip6src, m, opts) == 0) { 272 m_freem(m); 273 if (opts) 274 m_freem(opts); 275 RIP6_STATINC(RIP6_STAT_FULLSOCK); 276 } else 277 sorwakeup(last->in6p_socket); 278 } else { 279 RIP6_STATINC(RIP6_STAT_NOSOCK); 280 if (m->m_flags & M_MCAST) 281 RIP6_STATINC(RIP6_STAT_NOSOCKMCAST); 282 if (proto == IPPROTO_NONE) 283 m_freem(m); 284 else { 285 u_int8_t *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */ 286 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_protounknown); 287 icmp6_error(m, ICMP6_PARAM_PROB, 288 ICMP6_PARAMPROB_NEXTHEADER, 289 prvnxtp - mtod(m, u_int8_t *)); 290 } 291 IP6_STATDEC(IP6_STAT_DELIVERED); 292 } 293 return IPPROTO_DONE; 294 } 295 296 void * 297 rip6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 298 { 299 struct ip6_hdr *ip6; 300 struct ip6ctlparam *ip6cp = NULL; 301 const struct sockaddr_in6 *sa6_src = NULL; 302 void *cmdarg; 303 void (*notify)(struct in6pcb *, int) = in6_rtchange; 304 int nxt; 305 306 if (sa->sa_family != AF_INET6 || 307 sa->sa_len != sizeof(struct sockaddr_in6)) 308 return NULL;; 309 310 if ((unsigned)cmd >= PRC_NCMDS) 311 return NULL;; 312 if (PRC_IS_REDIRECT(cmd)) 313 notify = in6_rtchange, d = NULL; 314 else if (cmd == PRC_HOSTDEAD) 315 d = NULL; 316 else if (cmd == PRC_MSGSIZE) 317 ; /* special code is present, see below */ 318 else if (inet6ctlerrmap[cmd] == 0) 319 return NULL;; 320 321 /* if the parameter is from icmp6, decode it. */ 322 if (d != NULL) { 323 ip6cp = (struct ip6ctlparam *)d; 324 ip6 = ip6cp->ip6c_ip6; 325 cmdarg = ip6cp->ip6c_cmdarg; 326 sa6_src = ip6cp->ip6c_src; 327 nxt = ip6cp->ip6c_nxt; 328 } else { 329 ip6 = NULL; 330 cmdarg = NULL; 331 sa6_src = &sa6_any; 332 nxt = -1; 333 } 334 335 if (ip6 && cmd == PRC_MSGSIZE) { 336 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 337 int valid = 0; 338 struct in6pcb *in6p; 339 340 /* 341 * Check to see if we have a valid raw IPv6 socket 342 * corresponding to the address in the ICMPv6 message 343 * payload, and the protocol (ip6_nxt) meets the socket. 344 * XXX chase extension headers, or pass final nxt value 345 * from icmp6_notify_error() 346 */ 347 in6p = NULL; 348 in6p = in6_pcblookup_connect(&raw6cbtable, &sa6->sin6_addr, 0, 349 (const struct in6_addr *)&sa6_src->sin6_addr, 0, 0); 350 #if 0 351 if (!in6p) { 352 /* 353 * As the use of sendto(2) is fairly popular, 354 * we may want to allow non-connected pcb too. 355 * But it could be too weak against attacks... 356 * We should at least check if the local 357 * address (= s) is really ours. 358 */ 359 in6p = in6_pcblookup_bind(&raw6cbtable, 360 &sa6->sin6_addr, 0, 0); 361 } 362 #endif 363 364 if (in6p && in6p->in6p_ip6.ip6_nxt && 365 in6p->in6p_ip6.ip6_nxt == nxt) 366 valid++; 367 368 /* 369 * Depending on the value of "valid" and routing table 370 * size (mtudisc_{hi,lo}wat), we will: 371 * - recalculate the new MTU and create the 372 * corresponding routing entry, or 373 * - ignore the MTU change notification. 374 */ 375 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 376 377 /* 378 * regardless of if we called icmp6_mtudisc_update(), 379 * we need to call in6_pcbnotify(), to notify path MTU 380 * change to the userland (RFC3542), because some 381 * unconnected sockets may share the same destination 382 * and want to know the path MTU. 383 */ 384 } 385 386 (void) in6_pcbnotify(&raw6cbtable, sa, 0, 387 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 388 return NULL; 389 } 390 391 /* 392 * Generate IPv6 header and pass packet to ip6_output. 393 * Tack on options user may have setup with control call. 394 */ 395 int 396 rip6_output(struct mbuf *m, struct socket *so, struct sockaddr_in6 *dstsock, 397 struct mbuf *control) 398 { 399 struct in6_addr *dst; 400 struct ip6_hdr *ip6; 401 struct in6pcb *in6p; 402 u_int plen = m->m_pkthdr.len; 403 int error = 0; 404 struct ip6_pktopts opt, *optp = NULL; 405 struct ifnet *oifp = NULL; 406 int type, code; /* for ICMPv6 output statistics only */ 407 int priv = 0; 408 int scope_ambiguous = 0; 409 struct in6_addr *in6a; 410 411 in6p = sotoin6pcb(so); 412 413 priv = 0; 414 if (curlwp && !kauth_authorize_generic(curlwp->l_cred, 415 KAUTH_GENERIC_ISSUSER, NULL)) 416 priv = 1; 417 418 dst = &dstsock->sin6_addr; 419 if (control) { 420 if ((error = ip6_setpktopts(control, &opt, 421 in6p->in6p_outputopts, 422 priv, so->so_proto->pr_protocol)) != 0) { 423 goto bad; 424 } 425 optp = &opt; 426 } else 427 optp = in6p->in6p_outputopts; 428 429 /* 430 * Check and convert scope zone ID into internal form. 431 * XXX: we may still need to determine the zone later. 432 */ 433 if (!(so->so_state & SS_ISCONNECTED)) { 434 if (dstsock->sin6_scope_id == 0 && !ip6_use_defzone) 435 scope_ambiguous = 1; 436 if ((error = sa6_embedscope(dstsock, ip6_use_defzone)) != 0) 437 goto bad; 438 } 439 440 /* 441 * For an ICMPv6 packet, we should know its type and code 442 * to update statistics. 443 */ 444 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 445 struct icmp6_hdr *icmp6; 446 if (m->m_len < sizeof(struct icmp6_hdr) && 447 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { 448 error = ENOBUFS; 449 goto bad; 450 } 451 icmp6 = mtod(m, struct icmp6_hdr *); 452 type = icmp6->icmp6_type; 453 code = icmp6->icmp6_code; 454 } else { 455 type = 0; 456 code = 0; 457 } 458 459 M_PREPEND(m, sizeof(*ip6), M_DONTWAIT); 460 if (!m) { 461 error = ENOBUFS; 462 goto bad; 463 } 464 ip6 = mtod(m, struct ip6_hdr *); 465 466 /* 467 * Next header might not be ICMP6 but use its pseudo header anyway. 468 */ 469 ip6->ip6_dst = *dst; 470 471 /* 472 * Source address selection. 473 */ 474 if ((in6a = in6_selectsrc(dstsock, optp, in6p->in6p_moptions, 475 (struct route *)&in6p->in6p_route, &in6p->in6p_laddr, &oifp, 476 &error)) == 0) { 477 if (error == 0) 478 error = EADDRNOTAVAIL; 479 goto bad; 480 } 481 ip6->ip6_src = *in6a; 482 483 if (oifp && scope_ambiguous) { 484 /* 485 * Application should provide a proper zone ID or the use of 486 * default zone IDs should be enabled. Unfortunately, some 487 * applications do not behave as it should, so we need a 488 * workaround. Even if an appropriate ID is not determined 489 * (when it's required), if we can determine the outgoing 490 * interface. determine the zone ID based on the interface. 491 */ 492 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL); 493 if (error != 0) 494 goto bad; 495 } 496 ip6->ip6_dst = dstsock->sin6_addr; 497 498 /* fill in the rest of the IPv6 header fields */ 499 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK; 500 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 501 ip6->ip6_vfc |= IPV6_VERSION; 502 /* ip6_plen will be filled in ip6_output, so not fill it here. */ 503 ip6->ip6_nxt = in6p->in6p_ip6.ip6_nxt; 504 ip6->ip6_hlim = in6_selecthlim(in6p, oifp); 505 506 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 || 507 in6p->in6p_cksum != -1) { 508 int off; 509 u_int16_t sum; 510 511 /* compute checksum */ 512 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 513 off = offsetof(struct icmp6_hdr, icmp6_cksum); 514 else 515 off = in6p->in6p_cksum; 516 if (plen < off + 1) { 517 error = EINVAL; 518 goto bad; 519 } 520 off += sizeof(struct ip6_hdr); 521 522 sum = 0; 523 m = m_copyback_cow(m, off, sizeof(sum), (void *)&sum, 524 M_DONTWAIT); 525 if (m == NULL) { 526 error = ENOBUFS; 527 goto bad; 528 } 529 sum = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen); 530 m = m_copyback_cow(m, off, sizeof(sum), (void *)&sum, 531 M_DONTWAIT); 532 if (m == NULL) { 533 error = ENOBUFS; 534 goto bad; 535 } 536 } 537 538 error = ip6_output(m, optp, &in6p->in6p_route, 0, 539 in6p->in6p_moptions, so, &oifp); 540 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 541 if (oifp) 542 icmp6_ifoutstat_inc(oifp, type, code); 543 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 544 } else 545 RIP6_STATINC(RIP6_STAT_OPACKETS); 546 547 goto freectl; 548 549 bad: 550 if (m) 551 m_freem(m); 552 553 freectl: 554 if (control) { 555 ip6_clearpktopts(&opt, -1); 556 m_freem(control); 557 } 558 return error; 559 } 560 561 /* 562 * Raw IPv6 socket option processing. 563 */ 564 int 565 rip6_ctloutput(int op, struct socket *so, int level, int optname, 566 struct mbuf **mp) 567 { 568 int error = 0; 569 570 if (level == SOL_SOCKET && optname == SO_NOHEADER) { 571 /* need to fiddle w/ opt(IPPROTO_IPV6, IPV6_CHECKSUM)? */ 572 if (op == PRCO_GETOPT) { 573 *mp = m_intopt(so, 1); 574 return 0; 575 } else if (*mp == NULL || (*mp)->m_len != sizeof(int)) 576 error = EINVAL; 577 else if (*mtod(*mp, int *) == 0) 578 error = EINVAL; 579 goto free_m; 580 } else if (level != IPPROTO_IPV6) 581 return ip6_ctloutput(op, so, level, optname, mp); 582 583 switch (optname) { 584 case MRT6_INIT: 585 case MRT6_DONE: 586 case MRT6_ADD_MIF: 587 case MRT6_DEL_MIF: 588 case MRT6_ADD_MFC: 589 case MRT6_DEL_MFC: 590 case MRT6_PIM: 591 if (op == PRCO_SETOPT) 592 error = ip6_mrouter_set(optname, so, *mp); 593 else if (op == PRCO_GETOPT) 594 error = ip6_mrouter_get(optname, so, mp); 595 else 596 error = EINVAL; 597 break; 598 case IPV6_CHECKSUM: 599 return ip6_raw_ctloutput(op, so, level, optname, mp); 600 default: 601 return ip6_ctloutput(op, so, level, optname, mp); 602 } 603 free_m: 604 if (op == PRCO_SETOPT && *mp != NULL) 605 m_free(*mp); 606 return error; 607 } 608 609 extern u_long rip6_sendspace; 610 extern u_long rip6_recvspace; 611 612 int 613 rip6_usrreq(struct socket *so, int req, struct mbuf *m, 614 struct mbuf *nam, struct mbuf *control, struct lwp *l) 615 { 616 struct in6pcb *in6p = sotoin6pcb(so); 617 int s; 618 int error = 0; 619 int priv; 620 621 priv = 0; 622 if (l && !kauth_authorize_generic(l->l_cred, 623 KAUTH_GENERIC_ISSUSER, NULL)) 624 priv++; 625 626 if (req == PRU_CONTROL) 627 return in6_control(so, (u_long)m, (void *)nam, 628 (struct ifnet *)control, l); 629 630 if (req == PRU_PURGEIF) { 631 mutex_enter(softnet_lock); 632 in6_pcbpurgeif0(&raw6cbtable, (struct ifnet *)control); 633 in6_purgeif((struct ifnet *)control); 634 in6_pcbpurgeif(&raw6cbtable, (struct ifnet *)control); 635 mutex_exit(softnet_lock); 636 return 0; 637 } 638 639 switch (req) { 640 case PRU_ATTACH: 641 sosetlock(so); 642 if (in6p != NULL) 643 panic("rip6_attach"); 644 if (!priv) { 645 error = EACCES; 646 break; 647 } 648 s = splsoftnet(); 649 error = soreserve(so, rip6_sendspace, rip6_recvspace); 650 if (error != 0) { 651 splx(s); 652 break; 653 } 654 if ((error = in6_pcballoc(so, &raw6cbtable)) != 0) { 655 splx(s); 656 break; 657 } 658 splx(s); 659 in6p = sotoin6pcb(so); 660 in6p->in6p_ip6.ip6_nxt = (long)nam; 661 in6p->in6p_cksum = -1; 662 663 MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *, 664 sizeof(struct icmp6_filter), M_PCB, M_NOWAIT); 665 if (in6p->in6p_icmp6filt == NULL) { 666 in6_pcbdetach(in6p); 667 error = ENOMEM; 668 break; 669 } 670 ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt); 671 break; 672 673 case PRU_DISCONNECT: 674 if ((so->so_state & SS_ISCONNECTED) == 0) { 675 error = ENOTCONN; 676 break; 677 } 678 in6p->in6p_faddr = in6addr_any; 679 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 680 break; 681 682 case PRU_ABORT: 683 soisdisconnected(so); 684 /* Fallthrough */ 685 case PRU_DETACH: 686 if (in6p == NULL) 687 panic("rip6_detach"); 688 if (so == ip6_mrouter) 689 ip6_mrouter_done(); 690 /* xxx: RSVP */ 691 if (in6p->in6p_icmp6filt != NULL) { 692 FREE(in6p->in6p_icmp6filt, M_PCB); 693 in6p->in6p_icmp6filt = NULL; 694 } 695 in6_pcbdetach(in6p); 696 break; 697 698 case PRU_BIND: 699 { 700 struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *); 701 struct ifaddr *ia = NULL; 702 703 if (nam->m_len != sizeof(*addr)) { 704 error = EINVAL; 705 break; 706 } 707 if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6) { 708 error = EADDRNOTAVAIL; 709 break; 710 } 711 if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0) 712 break; 713 714 /* 715 * we don't support mapped address here, it would confuse 716 * users so reject it 717 */ 718 if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) { 719 error = EADDRNOTAVAIL; 720 break; 721 } 722 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) && 723 (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0) { 724 error = EADDRNOTAVAIL; 725 break; 726 } 727 if (ia && ((struct in6_ifaddr *)ia)->ia6_flags & 728 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 729 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 730 error = EADDRNOTAVAIL; 731 break; 732 } 733 in6p->in6p_laddr = addr->sin6_addr; 734 break; 735 } 736 737 case PRU_CONNECT: 738 { 739 struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *); 740 struct in6_addr *in6a = NULL; 741 struct ifnet *ifp = NULL; 742 int scope_ambiguous = 0; 743 744 if (nam->m_len != sizeof(*addr)) { 745 error = EINVAL; 746 break; 747 } 748 if (TAILQ_EMPTY(&ifnet)) { 749 error = EADDRNOTAVAIL; 750 break; 751 } 752 if (addr->sin6_family != AF_INET6) { 753 error = EAFNOSUPPORT; 754 break; 755 } 756 757 /* 758 * Application should provide a proper zone ID or the use of 759 * default zone IDs should be enabled. Unfortunately, some 760 * applications do not behave as it should, so we need a 761 * workaround. Even if an appropriate ID is not determined, 762 * we'll see if we can determine the outgoing interface. If we 763 * can, determine the zone ID based on the interface below. 764 */ 765 if (addr->sin6_scope_id == 0 && !ip6_use_defzone) 766 scope_ambiguous = 1; 767 if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0) 768 return error; 769 770 /* Source address selection. XXX: need pcblookup? */ 771 in6a = in6_selectsrc(addr, in6p->in6p_outputopts, 772 in6p->in6p_moptions, (struct route *)&in6p->in6p_route, 773 &in6p->in6p_laddr, &ifp, &error); 774 if (in6a == NULL) { 775 if (error == 0) 776 error = EADDRNOTAVAIL; 777 break; 778 } 779 /* XXX: see above */ 780 if (ifp && scope_ambiguous && 781 (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) { 782 break; 783 } 784 in6p->in6p_laddr = *in6a; 785 in6p->in6p_faddr = addr->sin6_addr; 786 soisconnected(so); 787 break; 788 } 789 790 case PRU_CONNECT2: 791 error = EOPNOTSUPP; 792 break; 793 794 /* 795 * Mark the connection as being incapable of futther input. 796 */ 797 case PRU_SHUTDOWN: 798 socantsendmore(so); 799 break; 800 /* 801 * Ship a packet out. The appropriate raw output 802 * routine handles any messaging necessary. 803 */ 804 case PRU_SEND: 805 { 806 struct sockaddr_in6 tmp; 807 struct sockaddr_in6 *dst; 808 809 /* always copy sockaddr to avoid overwrites */ 810 if (so->so_state & SS_ISCONNECTED) { 811 if (nam) { 812 error = EISCONN; 813 break; 814 } 815 /* XXX */ 816 sockaddr_in6_init(&tmp, &in6p->in6p_faddr, 0, 0, 0); 817 dst = &tmp; 818 } else { 819 if (nam == NULL) { 820 error = ENOTCONN; 821 break; 822 } 823 if (nam->m_len != sizeof(tmp)) { 824 error = EINVAL; 825 break; 826 } 827 828 tmp = *mtod(nam, struct sockaddr_in6 *); 829 dst = &tmp; 830 831 if (dst->sin6_family != AF_INET6) { 832 error = EAFNOSUPPORT; 833 break; 834 } 835 } 836 error = rip6_output(m, so, dst, control); 837 m = NULL; 838 break; 839 } 840 841 case PRU_SENSE: 842 /* 843 * stat: don't bother with a blocksize 844 */ 845 return 0; 846 /* 847 * Not supported. 848 */ 849 case PRU_RCVOOB: 850 case PRU_RCVD: 851 case PRU_LISTEN: 852 case PRU_ACCEPT: 853 case PRU_SENDOOB: 854 error = EOPNOTSUPP; 855 break; 856 857 case PRU_SOCKADDR: 858 in6_setsockaddr(in6p, nam); 859 break; 860 861 case PRU_PEERADDR: 862 in6_setpeeraddr(in6p, nam); 863 break; 864 865 default: 866 panic("rip6_usrreq"); 867 } 868 if (m != NULL) 869 m_freem(m); 870 return error; 871 } 872 873 static int 874 sysctl_net_inet6_raw6_stats(SYSCTLFN_ARGS) 875 { 876 877 return (NETSTAT_SYSCTL(rip6stat_percpu, RIP6_NSTATS)); 878 } 879 880 SYSCTL_SETUP(sysctl_net_inet6_raw6_setup, "sysctl net.inet6.raw6 subtree setup") 881 { 882 883 sysctl_createv(clog, 0, NULL, NULL, 884 CTLFLAG_PERMANENT, 885 CTLTYPE_NODE, "net", NULL, 886 NULL, 0, NULL, 0, 887 CTL_NET, CTL_EOL); 888 sysctl_createv(clog, 0, NULL, NULL, 889 CTLFLAG_PERMANENT, 890 CTLTYPE_NODE, "inet6", NULL, 891 NULL, 0, NULL, 0, 892 CTL_NET, PF_INET6, CTL_EOL); 893 sysctl_createv(clog, 0, NULL, NULL, 894 CTLFLAG_PERMANENT, 895 CTLTYPE_NODE, "raw6", 896 SYSCTL_DESCR("Raw IPv6 settings"), 897 NULL, 0, NULL, 0, 898 CTL_NET, PF_INET6, IPPROTO_RAW, CTL_EOL); 899 900 sysctl_createv(clog, 0, NULL, NULL, 901 CTLFLAG_PERMANENT, 902 CTLTYPE_STRUCT, "pcblist", 903 SYSCTL_DESCR("Raw IPv6 control block list"), 904 sysctl_inpcblist, 0, &raw6cbtable, 0, 905 CTL_NET, PF_INET6, IPPROTO_RAW, 906 CTL_CREATE, CTL_EOL); 907 sysctl_createv(clog, 0, NULL, NULL, 908 CTLFLAG_PERMANENT, 909 CTLTYPE_STRUCT, "stats", 910 SYSCTL_DESCR("Raw IPv6 statistics"), 911 sysctl_net_inet6_raw6_stats, 0, NULL, 0, 912 CTL_NET, PF_INET6, IPPROTO_RAW, RAW6CTL_STATS, 913 CTL_EOL); 914 } 915
Indexes created Tue Sep 23 23:09:58 GMT 2025