raw_ip6.c revision 1.96
1 /* $NetBSD: raw_ip6.c,v 1.96 2008/04/15 05:23:33 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 1.96 2008/04/15 05:23:33 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 #include <sys/percpu.h> 81 82 #include <net/if.h> 83 #include <net/route.h> 84 #include <net/if_types.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 #endif /* IPSEC */ 103 104 #ifdef FAST_IPSEC 105 #include <netipsec/ipsec.h> 106 #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */ 107 #include <netipsec/ipsec6.h> 108 #endif 109 110 #include "faith.h" 111 #if defined(NFAITH) && 0 < NFAITH 112 #include <net/if_faith.h> 113 #endif 114 115 extern struct inpcbtable rawcbtable; 116 struct inpcbtable raw6cbtable; 117 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 118 119 /* 120 * Raw interface to IP6 protocol. 121 */ 122 123 static percpu_t *rip6stat_percpu; 124 125 #define RIP6_STATINC(x) \ 126 do { \ 127 uint64_t *_rip6s_ = percpu_getref(rip6stat_percpu); \ 128 _rip6s_[x]++; \ 129 percpu_putref(rip6stat_percpu); \ 130 } while (/*CONSTCOND*/0) 131 132 /* 133 * Initialize raw connection block queue. 134 */ 135 void 136 rip6_init() 137 { 138 139 in6_pcbinit(&raw6cbtable, 1, 1); 140 141 rip6stat_percpu = percpu_alloc(sizeof(uint64_t) * RIP6_NSTATS); 142 } 143 144 /* 145 * Setup generic address and protocol structures 146 * for raw_input routine, then pass them along with 147 * mbuf chain. 148 */ 149 int 150 rip6_input(struct mbuf **mp, int *offp, int proto) 151 { 152 struct mbuf *m = *mp; 153 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 154 struct inpcb_hdr *inph; 155 struct in6pcb *in6p; 156 struct in6pcb *last = NULL; 157 struct sockaddr_in6 rip6src; 158 struct mbuf *opts = NULL; 159 160 RIP6_STATINC(RIP6_STAT_IPACKETS); 161 162 #if defined(NFAITH) && 0 < NFAITH 163 if (faithprefix(&ip6->ip6_dst)) { 164 /* send icmp6 host unreach? */ 165 m_freem(m); 166 return IPPROTO_DONE; 167 } 168 #endif 169 170 /* Be proactive about malicious use of IPv4 mapped address */ 171 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 172 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 173 /* XXX stat */ 174 m_freem(m); 175 return IPPROTO_DONE; 176 } 177 178 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 179 if (sa6_recoverscope(&rip6src) != 0) { 180 /* XXX: should be impossible. */ 181 m_freem(m); 182 return IPPROTO_DONE; 183 } 184 185 CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 186 in6p = (struct in6pcb *)inph; 187 if (in6p->in6p_af != AF_INET6) 188 continue; 189 if (in6p->in6p_ip6.ip6_nxt && 190 in6p->in6p_ip6.ip6_nxt != proto) 191 continue; 192 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 193 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 194 continue; 195 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 196 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 197 continue; 198 if (in6p->in6p_cksum != -1) { 199 RIP6_STATINC(RIP6_STAT_ISUM); 200 if (in6_cksum(m, proto, *offp, 201 m->m_pkthdr.len - *offp)) { 202 RIP6_STATINC(RIP6_STAT_BADSUM); 203 continue; 204 } 205 } 206 if (last) { 207 struct mbuf *n; 208 209 #ifdef IPSEC 210 /* 211 * Check AH/ESP integrity. 212 */ 213 if (ipsec6_in_reject(m, last)) { 214 ipsec6stat.in_polvio++; 215 /* do not inject data into pcb */ 216 } else 217 #endif /* IPSEC */ 218 #ifdef FAST_IPSEC 219 /* 220 * Check AH/ESP integrity 221 */ 222 if (!ipsec6_in_reject(m,last)) 223 #endif /* FAST_IPSEC */ 224 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 225 if (last->in6p_flags & IN6P_CONTROLOPTS) 226 ip6_savecontrol(last, &opts, ip6, n); 227 /* strip intermediate headers */ 228 m_adj(n, *offp); 229 if (sbappendaddr(&last->in6p_socket->so_rcv, 230 (struct sockaddr *)&rip6src, n, opts) == 0) { 231 /* should notify about lost packet */ 232 m_freem(n); 233 if (opts) 234 m_freem(opts); 235 RIP6_STATINC(RIP6_STAT_FULLSOCK); 236 } else 237 sorwakeup(last->in6p_socket); 238 opts = NULL; 239 } 240 } 241 last = in6p; 242 } 243 #ifdef IPSEC 244 /* 245 * Check AH/ESP integrity. 246 */ 247 if (last && ipsec6_in_reject(m, last)) { 248 m_freem(m); 249 ipsec6stat.in_polvio++; 250 IP6_STATDEC(IP6_STAT_DELIVERED); 251 /* do not inject data into pcb */ 252 } else 253 #endif /* IPSEC */ 254 #ifdef FAST_IPSEC 255 if (last && ipsec6_in_reject(m, last)) { 256 m_freem(m); 257 /* 258 * XXX ipsec6_in_reject update stat if there is an error 259 * so we just need to update stats by hand in the case of last is 260 * NULL 261 */ 262 if (!last) 263 ipsec6stat.in_polvio++; 264 IP6_STATDEC(IP6_STAT_DELIVERED); 265 /* do not inject data into pcb */ 266 } else 267 #endif /* FAST_IPSEC */ 268 if (last) { 269 if (last->in6p_flags & IN6P_CONTROLOPTS) 270 ip6_savecontrol(last, &opts, ip6, m); 271 /* strip intermediate headers */ 272 m_adj(m, *offp); 273 if (sbappendaddr(&last->in6p_socket->so_rcv, 274 (struct sockaddr *)&rip6src, m, opts) == 0) { 275 m_freem(m); 276 if (opts) 277 m_freem(opts); 278 RIP6_STATINC(RIP6_STAT_FULLSOCK); 279 } else 280 sorwakeup(last->in6p_socket); 281 } else { 282 RIP6_STATINC(RIP6_STAT_NOSOCK); 283 if (m->m_flags & M_MCAST) 284 RIP6_STATINC(RIP6_STAT_NOSOCKMCAST); 285 if (proto == IPPROTO_NONE) 286 m_freem(m); 287 else { 288 u_int8_t *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */ 289 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_protounknown); 290 icmp6_error(m, ICMP6_PARAM_PROB, 291 ICMP6_PARAMPROB_NEXTHEADER, 292 prvnxtp - mtod(m, u_int8_t *)); 293 } 294 IP6_STATDEC(IP6_STAT_DELIVERED); 295 } 296 return IPPROTO_DONE; 297 } 298 299 void 300 rip6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 301 { 302 struct ip6_hdr *ip6; 303 struct ip6ctlparam *ip6cp = NULL; 304 const struct sockaddr_in6 *sa6_src = NULL; 305 void *cmdarg; 306 void (*notify)(struct in6pcb *, int) = in6_rtchange; 307 int nxt; 308 309 if (sa->sa_family != AF_INET6 || 310 sa->sa_len != sizeof(struct sockaddr_in6)) 311 return; 312 313 if ((unsigned)cmd >= PRC_NCMDS) 314 return; 315 if (PRC_IS_REDIRECT(cmd)) 316 notify = in6_rtchange, d = NULL; 317 else if (cmd == PRC_HOSTDEAD) 318 d = NULL; 319 else if (cmd == PRC_MSGSIZE) 320 ; /* special code is present, see below */ 321 else if (inet6ctlerrmap[cmd] == 0) 322 return; 323 324 /* if the parameter is from icmp6, decode it. */ 325 if (d != NULL) { 326 ip6cp = (struct ip6ctlparam *)d; 327 ip6 = ip6cp->ip6c_ip6; 328 cmdarg = ip6cp->ip6c_cmdarg; 329 sa6_src = ip6cp->ip6c_src; 330 nxt = ip6cp->ip6c_nxt; 331 } else { 332 ip6 = NULL; 333 cmdarg = NULL; 334 sa6_src = &sa6_any; 335 nxt = -1; 336 } 337 338 if (ip6 && cmd == PRC_MSGSIZE) { 339 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 340 int valid = 0; 341 struct in6pcb *in6p; 342 343 /* 344 * Check to see if we have a valid raw IPv6 socket 345 * corresponding to the address in the ICMPv6 message 346 * payload, and the protocol (ip6_nxt) meets the socket. 347 * XXX chase extension headers, or pass final nxt value 348 * from icmp6_notify_error() 349 */ 350 in6p = NULL; 351 in6p = in6_pcblookup_connect(&raw6cbtable, &sa6->sin6_addr, 0, 352 (const struct in6_addr *)&sa6_src->sin6_addr, 0, 0); 353 #if 0 354 if (!in6p) { 355 /* 356 * As the use of sendto(2) is fairly popular, 357 * we may want to allow non-connected pcb too. 358 * But it could be too weak against attacks... 359 * We should at least check if the local 360 * address (= s) is really ours. 361 */ 362 in6p = in6_pcblookup_bind(&raw6cbtable, 363 &sa6->sin6_addr, 0, 0); 364 } 365 #endif 366 367 if (in6p && in6p->in6p_ip6.ip6_nxt && 368 in6p->in6p_ip6.ip6_nxt == nxt) 369 valid++; 370 371 /* 372 * Depending on the value of "valid" and routing table 373 * size (mtudisc_{hi,lo}wat), we will: 374 * - recalculate the new MTU and create the 375 * corresponding routing entry, or 376 * - ignore the MTU change notification. 377 */ 378 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 379 380 /* 381 * regardless of if we called icmp6_mtudisc_update(), 382 * we need to call in6_pcbnotify(), to notify path MTU 383 * change to the userland (RFC3542), because some 384 * unconnected sockets may share the same destination 385 * and want to know the path MTU. 386 */ 387 } 388 389 (void) in6_pcbnotify(&raw6cbtable, sa, 0, 390 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 391 } 392 393 /* 394 * Generate IPv6 header and pass packet to ip6_output. 395 * Tack on options user may have setup with control call. 396 */ 397 int 398 rip6_output(struct mbuf *m, struct socket *so, struct sockaddr_in6 *dstsock, 399 struct mbuf *control) 400 { 401 struct in6_addr *dst; 402 struct ip6_hdr *ip6; 403 struct in6pcb *in6p; 404 u_int plen = m->m_pkthdr.len; 405 int error = 0; 406 struct ip6_pktopts opt, *optp = NULL; 407 struct ifnet *oifp = NULL; 408 int type, code; /* for ICMPv6 output statistics only */ 409 int priv = 0; 410 int scope_ambiguous = 0; 411 struct in6_addr *in6a; 412 413 in6p = sotoin6pcb(so); 414 415 priv = 0; 416 if (curlwp && !kauth_authorize_generic(curlwp->l_cred, 417 KAUTH_GENERIC_ISSUSER, NULL)) 418 priv = 1; 419 420 dst = &dstsock->sin6_addr; 421 if (control) { 422 if ((error = ip6_setpktopts(control, &opt, 423 in6p->in6p_outputopts, 424 priv, so->so_proto->pr_protocol)) != 0) { 425 goto bad; 426 } 427 optp = &opt; 428 } else 429 optp = in6p->in6p_outputopts; 430 431 /* 432 * Check and convert scope zone ID into internal form. 433 * XXX: we may still need to determine the zone later. 434 */ 435 if (!(so->so_state & SS_ISCONNECTED)) { 436 if (dstsock->sin6_scope_id == 0 && !ip6_use_defzone) 437 scope_ambiguous = 1; 438 if ((error = sa6_embedscope(dstsock, ip6_use_defzone)) != 0) 439 goto bad; 440 } 441 442 /* 443 * For an ICMPv6 packet, we should know its type and code 444 * to update statistics. 445 */ 446 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 447 struct icmp6_hdr *icmp6; 448 if (m->m_len < sizeof(struct icmp6_hdr) && 449 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { 450 error = ENOBUFS; 451 goto bad; 452 } 453 icmp6 = mtod(m, struct icmp6_hdr *); 454 type = icmp6->icmp6_type; 455 code = icmp6->icmp6_code; 456 } else { 457 type = 0; 458 code = 0; 459 } 460 461 M_PREPEND(m, sizeof(*ip6), M_DONTWAIT); 462 if (!m) { 463 error = ENOBUFS; 464 goto bad; 465 } 466 ip6 = mtod(m, struct ip6_hdr *); 467 468 /* 469 * Next header might not be ICMP6 but use its pseudo header anyway. 470 */ 471 ip6->ip6_dst = *dst; 472 473 /* 474 * Source address selection. 475 */ 476 if ((in6a = in6_selectsrc(dstsock, optp, in6p->in6p_moptions, 477 (struct route *)&in6p->in6p_route, &in6p->in6p_laddr, &oifp, 478 &error)) == 0) { 479 if (error == 0) 480 error = EADDRNOTAVAIL; 481 goto bad; 482 } 483 ip6->ip6_src = *in6a; 484 485 if (oifp && scope_ambiguous) { 486 /* 487 * Application should provide a proper zone ID or the use of 488 * default zone IDs should be enabled. Unfortunately, some 489 * applications do not behave as it should, so we need a 490 * workaround. Even if an appropriate ID is not determined 491 * (when it's required), if we can determine the outgoing 492 * interface. determine the zone ID based on the interface. 493 */ 494 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL); 495 if (error != 0) 496 goto bad; 497 } 498 ip6->ip6_dst = dstsock->sin6_addr; 499 500 /* fill in the rest of the IPv6 header fields */ 501 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK; 502 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 503 ip6->ip6_vfc |= IPV6_VERSION; 504 /* ip6_plen will be filled in ip6_output, so not fill it here. */ 505 ip6->ip6_nxt = in6p->in6p_ip6.ip6_nxt; 506 ip6->ip6_hlim = in6_selecthlim(in6p, oifp); 507 508 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 || 509 in6p->in6p_cksum != -1) { 510 int off; 511 u_int16_t sum; 512 513 /* compute checksum */ 514 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 515 off = offsetof(struct icmp6_hdr, icmp6_cksum); 516 else 517 off = in6p->in6p_cksum; 518 if (plen < off + 1) { 519 error = EINVAL; 520 goto bad; 521 } 522 off += sizeof(struct ip6_hdr); 523 524 sum = 0; 525 m = m_copyback_cow(m, off, sizeof(sum), (void *)&sum, 526 M_DONTWAIT); 527 if (m == NULL) { 528 error = ENOBUFS; 529 goto bad; 530 } 531 sum = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen); 532 m = m_copyback_cow(m, off, sizeof(sum), (void *)&sum, 533 M_DONTWAIT); 534 if (m == NULL) { 535 error = ENOBUFS; 536 goto bad; 537 } 538 } 539 540 error = ip6_output(m, optp, &in6p->in6p_route, 0, 541 in6p->in6p_moptions, so, &oifp); 542 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 543 if (oifp) 544 icmp6_ifoutstat_inc(oifp, type, code); 545 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 546 } else 547 RIP6_STATINC(RIP6_STAT_OPACKETS); 548 549 goto freectl; 550 551 bad: 552 if (m) 553 m_freem(m); 554 555 freectl: 556 if (control) { 557 ip6_clearpktopts(&opt, -1); 558 m_freem(control); 559 } 560 return error; 561 } 562 563 /* 564 * Raw IPv6 socket option processing. 565 */ 566 int 567 rip6_ctloutput(int op, struct socket *so, int level, int optname, 568 struct mbuf **mp) 569 { 570 int error = 0; 571 572 if (level == SOL_SOCKET && optname == SO_NOHEADER) { 573 /* need to fiddle w/ opt(IPPROTO_IPV6, IPV6_CHECKSUM)? */ 574 if (op == PRCO_GETOPT) { 575 *mp = m_intopt(so, 1); 576 return 0; 577 } else if (*mp == NULL || (*mp)->m_len != sizeof(int)) 578 error = EINVAL; 579 else if (*mtod(*mp, int *) == 0) 580 error = EINVAL; 581 goto free_m; 582 } else if (level != IPPROTO_IPV6) 583 return ip6_ctloutput(op, so, level, optname, mp); 584 585 switch (optname) { 586 case MRT6_INIT: 587 case MRT6_DONE: 588 case MRT6_ADD_MIF: 589 case MRT6_DEL_MIF: 590 case MRT6_ADD_MFC: 591 case MRT6_DEL_MFC: 592 case MRT6_PIM: 593 if (op == PRCO_SETOPT) 594 error = ip6_mrouter_set(optname, so, *mp); 595 else if (op == PRCO_GETOPT) 596 error = ip6_mrouter_get(optname, so, mp); 597 else 598 error = EINVAL; 599 break; 600 case IPV6_CHECKSUM: 601 return ip6_raw_ctloutput(op, so, level, optname, mp); 602 default: 603 return ip6_ctloutput(op, so, level, optname, mp); 604 } 605 free_m: 606 if (op == PRCO_SETOPT && *mp != NULL) 607 m_free(*mp); 608 return error; 609 } 610 611 extern u_long rip6_sendspace; 612 extern u_long rip6_recvspace; 613 614 int 615 rip6_usrreq(struct socket *so, int req, struct mbuf *m, 616 struct mbuf *nam, struct mbuf *control, struct lwp *l) 617 { 618 struct in6pcb *in6p = sotoin6pcb(so); 619 int s; 620 int error = 0; 621 int priv; 622 623 priv = 0; 624 if (l && !kauth_authorize_generic(l->l_cred, 625 KAUTH_GENERIC_ISSUSER, NULL)) 626 priv++; 627 628 if (req == PRU_CONTROL) 629 return in6_control(so, (u_long)m, (void *)nam, 630 (struct ifnet *)control, l); 631 632 if (req == PRU_PURGEIF) { 633 in6_pcbpurgeif0(&raw6cbtable, (struct ifnet *)control); 634 in6_purgeif((struct ifnet *)control); 635 in6_pcbpurgeif(&raw6cbtable, (struct ifnet *)control); 636 return 0; 637 } 638 639 switch (req) { 640 case PRU_ATTACH: 641 if (in6p != NULL) 642 panic("rip6_attach"); 643 if (!priv) { 644 error = EACCES; 645 break; 646 } 647 s = splsoftnet(); 648 error = soreserve(so, rip6_sendspace, rip6_recvspace); 649 if (error != 0) { 650 splx(s); 651 break; 652 } 653 if ((error = in6_pcballoc(so, &raw6cbtable)) != 0) { 654 splx(s); 655 break; 656 } 657 splx(s); 658 in6p = sotoin6pcb(so); 659 in6p->in6p_ip6.ip6_nxt = (long)nam; 660 in6p->in6p_cksum = -1; 661 662 MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *, 663 sizeof(struct icmp6_filter), M_PCB, M_NOWAIT); 664 if (in6p->in6p_icmp6filt == NULL) { 665 in6_pcbdetach(in6p); 666 error = ENOMEM; 667 break; 668 } 669 ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt); 670 break; 671 672 case PRU_DISCONNECT: 673 if ((so->so_state & SS_ISCONNECTED) == 0) { 674 error = ENOTCONN; 675 break; 676 } 677 in6p->in6p_faddr = in6addr_any; 678 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 679 break; 680 681 case PRU_ABORT: 682 soisdisconnected(so); 683 /* Fallthrough */ 684 case PRU_DETACH: 685 if (in6p == NULL) 686 panic("rip6_detach"); 687 if (so == ip6_mrouter) 688 ip6_mrouter_done(); 689 /* xxx: RSVP */ 690 if (in6p->in6p_icmp6filt != NULL) { 691 FREE(in6p->in6p_icmp6filt, M_PCB); 692 in6p->in6p_icmp6filt = NULL; 693 } 694 in6_pcbdetach(in6p); 695 break; 696 697 case PRU_BIND: 698 { 699 struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *); 700 struct ifaddr *ia = NULL; 701 702 if (nam->m_len != sizeof(*addr)) { 703 error = EINVAL; 704 break; 705 } 706 if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6) { 707 error = EADDRNOTAVAIL; 708 break; 709 } 710 if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0) 711 break; 712 713 /* 714 * we don't support mapped address here, it would confuse 715 * users so reject it 716 */ 717 if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) { 718 error = EADDRNOTAVAIL; 719 break; 720 } 721 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) && 722 (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0) { 723 error = EADDRNOTAVAIL; 724 break; 725 } 726 if (ia && ((struct in6_ifaddr *)ia)->ia6_flags & 727 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 728 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 729 error = EADDRNOTAVAIL; 730 break; 731 } 732 in6p->in6p_laddr = addr->sin6_addr; 733 break; 734 } 735 736 case PRU_CONNECT: 737 { 738 struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *); 739 struct in6_addr *in6a = NULL; 740 struct ifnet *ifp = NULL; 741 int scope_ambiguous = 0; 742 743 if (nam->m_len != sizeof(*addr)) { 744 error = EINVAL; 745 break; 746 } 747 if (TAILQ_EMPTY(&ifnet)) { 748 error = EADDRNOTAVAIL; 749 break; 750 } 751 if (addr->sin6_family != AF_INET6) { 752 error = EAFNOSUPPORT; 753 break; 754 } 755 756 /* 757 * Application should provide a proper zone ID or the use of 758 * default zone IDs should be enabled. Unfortunately, some 759 * applications do not behave as it should, so we need a 760 * workaround. Even if an appropriate ID is not determined, 761 * we'll see if we can determine the outgoing interface. If we 762 * can, determine the zone ID based on the interface below. 763 */ 764 if (addr->sin6_scope_id == 0 && !ip6_use_defzone) 765 scope_ambiguous = 1; 766 if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0) 767 return error; 768 769 /* Source address selection. XXX: need pcblookup? */ 770 in6a = in6_selectsrc(addr, in6p->in6p_outputopts, 771 in6p->in6p_moptions, (struct route *)&in6p->in6p_route, 772 &in6p->in6p_laddr, &ifp, &error); 773 if (in6a == NULL) { 774 if (error == 0) 775 error = EADDRNOTAVAIL; 776 break; 777 } 778 /* XXX: see above */ 779 if (ifp && scope_ambiguous && 780 (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) { 781 break; 782 } 783 in6p->in6p_laddr = *in6a; 784 in6p->in6p_faddr = addr->sin6_addr; 785 soisconnected(so); 786 break; 787 } 788 789 case PRU_CONNECT2: 790 error = EOPNOTSUPP; 791 break; 792 793 /* 794 * Mark the connection as being incapable of futther input. 795 */ 796 case PRU_SHUTDOWN: 797 socantsendmore(so); 798 break; 799 /* 800 * Ship a packet out. The appropriate raw output 801 * routine handles any messaging necessary. 802 */ 803 case PRU_SEND: 804 { 805 struct sockaddr_in6 tmp; 806 struct sockaddr_in6 *dst; 807 808 /* always copy sockaddr to avoid overwrites */ 809 if (so->so_state & SS_ISCONNECTED) { 810 if (nam) { 811 error = EISCONN; 812 break; 813 } 814 /* XXX */ 815 sockaddr_in6_init(&tmp, &in6p->in6p_faddr, 0, 0, 0); 816 dst = &tmp; 817 } else { 818 if (nam == NULL) { 819 error = ENOTCONN; 820 break; 821 } 822 if (nam->m_len != sizeof(tmp)) { 823 error = EINVAL; 824 break; 825 } 826 827 tmp = *mtod(nam, struct sockaddr_in6 *); 828 dst = &tmp; 829 830 if (dst->sin6_family != AF_INET6) { 831 error = EAFNOSUPPORT; 832 break; 833 } 834 } 835 error = rip6_output(m, so, dst, control); 836 m = NULL; 837 break; 838 } 839 840 case PRU_SENSE: 841 /* 842 * stat: don't bother with a blocksize 843 */ 844 return 0; 845 /* 846 * Not supported. 847 */ 848 case PRU_RCVOOB: 849 case PRU_RCVD: 850 case PRU_LISTEN: 851 case PRU_ACCEPT: 852 case PRU_SENDOOB: 853 error = EOPNOTSUPP; 854 break; 855 856 case PRU_SOCKADDR: 857 in6_setsockaddr(in6p, nam); 858 break; 859 860 case PRU_PEERADDR: 861 in6_setpeeraddr(in6p, nam); 862 break; 863 864 default: 865 panic("rip6_usrreq"); 866 } 867 if (m != NULL) 868 m_freem(m); 869 return error; 870 } 871 872 static void 873 rip6stat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci) 874 { 875 uint64_t *rip6sc = v1; 876 uint64_t *rip6s = v2; 877 u_int i; 878 879 for (i = 0; i < RIP6_NSTATS; i++) 880 rip6s[i] += rip6sc[i]; 881 } 882 883 static void 884 rip6stat_convert_to_user(uint64_t *rip6s) 885 { 886 887 memset(rip6s, 0, sizeof(uint64_t) * RIP6_NSTATS); 888 percpu_foreach(rip6stat_percpu, rip6stat_convert_to_user_cb, rip6s); 889 } 890 891 static int 892 sysctl_net_inet6_raw6_stats(SYSCTLFN_ARGS) 893 { 894 struct sysctlnode node; 895 uint64_t rip6s[RIP6_NSTATS]; 896 897 rip6stat_convert_to_user(rip6s); 898 node = *rnode; 899 node.sysctl_data = rip6s; 900 node.sysctl_size = sizeof(rip6s); 901 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 902 } 903 904 SYSCTL_SETUP(sysctl_net_inet6_raw6_setup, "sysctl net.inet6.raw6 subtree setup") 905 { 906 907 sysctl_createv(clog, 0, NULL, NULL, 908 CTLFLAG_PERMANENT, 909 CTLTYPE_NODE, "net", NULL, 910 NULL, 0, NULL, 0, 911 CTL_NET, CTL_EOL); 912 sysctl_createv(clog, 0, NULL, NULL, 913 CTLFLAG_PERMANENT, 914 CTLTYPE_NODE, "inet6", NULL, 915 NULL, 0, NULL, 0, 916 CTL_NET, PF_INET6, CTL_EOL); 917 sysctl_createv(clog, 0, NULL, NULL, 918 CTLFLAG_PERMANENT, 919 CTLTYPE_NODE, "raw6", 920 SYSCTL_DESCR("Raw IPv6 settings"), 921 NULL, 0, NULL, 0, 922 CTL_NET, PF_INET6, IPPROTO_RAW, CTL_EOL); 923 924 sysctl_createv(clog, 0, NULL, NULL, 925 CTLFLAG_PERMANENT, 926 CTLTYPE_STRUCT, "pcblist", 927 SYSCTL_DESCR("Raw IPv6 control block list"), 928 sysctl_inpcblist, 0, &raw6cbtable, 0, 929 CTL_NET, PF_INET6, IPPROTO_RAW, 930 CTL_CREATE, CTL_EOL); 931 sysctl_createv(clog, 0, NULL, NULL, 932 CTLFLAG_PERMANENT, 933 CTLTYPE_STRUCT, "stats", 934 SYSCTL_DESCR("Raw IPv6 statistics"), 935 sysctl_net_inet6_raw6_stats, 0, NULL, 0, 936 CTL_NET, PF_INET6, IPPROTO_RAW, RAW6CTL_STATS, 937 CTL_EOL); 938 } 939
Indexes created Tue Sep 30 20:09:53 GMT 2025