raw_ip6.c revision 1.95
1 /* $NetBSD: raw_ip6.c,v 1.95 2008/04/15 05:13:37 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 1.95 2008/04/15 05:13:37 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 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet/ip6.h> 88 #include <netinet6/ip6_var.h> 89 #include <netinet6/ip6_private.h> 90 #include <netinet6/ip6_mroute.h> 91 #include <netinet/icmp6.h> 92 #include <netinet6/icmp6_private.h> 93 #include <netinet6/in6_pcb.h> 94 #include <netinet6/nd6.h> 95 #include <netinet6/ip6protosw.h> 96 #include <netinet6/scope6_var.h> 97 #include <netinet6/raw_ip6.h> 98 99 #ifdef IPSEC 100 #include <netinet6/ipsec.h> 101 #endif /* IPSEC */ 102 103 #ifdef FAST_IPSEC 104 #include <netipsec/ipsec.h> 105 #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */ 106 #include <netipsec/ipsec6.h> 107 #endif 108 109 #include "faith.h" 110 #if defined(NFAITH) && 0 < NFAITH 111 #include <net/if_faith.h> 112 #endif 113 114 extern struct inpcbtable rawcbtable; 115 struct inpcbtable raw6cbtable; 116 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 117 118 /* 119 * Raw interface to IP6 protocol. 120 */ 121 122 static percpu_t *rip6stat_percpu; 123 124 #define RIP6_STATINC(x) \ 125 do { \ 126 uint64_t *_rip6s_ = percpu_getref(rip6stat_percpu); \ 127 _rip6s_[x]++; \ 128 percpu_putref(rip6stat_percpu); \ 129 } while (/*CONSTCOND*/0) 130 131 /* 132 * Initialize raw connection block queue. 133 */ 134 void 135 rip6_init() 136 { 137 138 in6_pcbinit(&raw6cbtable, 1, 1); 139 140 rip6stat_percpu = percpu_alloc(sizeof(uint64_t) * RIP6_NSTATS); 141 } 142 143 /* 144 * Setup generic address and protocol structures 145 * for raw_input routine, then pass them along with 146 * mbuf chain. 147 */ 148 int 149 rip6_input(struct mbuf **mp, int *offp, int proto) 150 { 151 struct mbuf *m = *mp; 152 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 153 struct inpcb_hdr *inph; 154 struct in6pcb *in6p; 155 struct in6pcb *last = NULL; 156 struct sockaddr_in6 rip6src; 157 struct mbuf *opts = NULL; 158 159 RIP6_STATINC(RIP6_STAT_IPACKETS); 160 161 #if defined(NFAITH) && 0 < NFAITH 162 if (faithprefix(&ip6->ip6_dst)) { 163 /* send icmp6 host unreach? */ 164 m_freem(m); 165 return IPPROTO_DONE; 166 } 167 #endif 168 169 /* Be proactive about malicious use of IPv4 mapped address */ 170 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 171 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 172 /* XXX stat */ 173 m_freem(m); 174 return IPPROTO_DONE; 175 } 176 177 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 178 if (sa6_recoverscope(&rip6src) != 0) { 179 /* XXX: should be impossible. */ 180 m_freem(m); 181 return IPPROTO_DONE; 182 } 183 184 CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 185 in6p = (struct in6pcb *)inph; 186 if (in6p->in6p_af != AF_INET6) 187 continue; 188 if (in6p->in6p_ip6.ip6_nxt && 189 in6p->in6p_ip6.ip6_nxt != proto) 190 continue; 191 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 192 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 193 continue; 194 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 195 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 196 continue; 197 if (in6p->in6p_cksum != -1) { 198 RIP6_STATINC(RIP6_STAT_ISUM); 199 if (in6_cksum(m, proto, *offp, 200 m->m_pkthdr.len - *offp)) { 201 RIP6_STATINC(RIP6_STAT_BADSUM); 202 continue; 203 } 204 } 205 if (last) { 206 struct mbuf *n; 207 208 #ifdef IPSEC 209 /* 210 * Check AH/ESP integrity. 211 */ 212 if (ipsec6_in_reject(m, last)) { 213 ipsec6stat.in_polvio++; 214 /* do not inject data into pcb */ 215 } else 216 #endif /* IPSEC */ 217 #ifdef FAST_IPSEC 218 /* 219 * Check AH/ESP integrity 220 */ 221 if (!ipsec6_in_reject(m,last)) 222 #endif /* FAST_IPSEC */ 223 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 224 if (last->in6p_flags & IN6P_CONTROLOPTS) 225 ip6_savecontrol(last, &opts, ip6, n); 226 /* strip intermediate headers */ 227 m_adj(n, *offp); 228 if (sbappendaddr(&last->in6p_socket->so_rcv, 229 (struct sockaddr *)&rip6src, n, opts) == 0) { 230 /* should notify about lost packet */ 231 m_freem(n); 232 if (opts) 233 m_freem(opts); 234 RIP6_STATINC(RIP6_STAT_FULLSOCK); 235 } else 236 sorwakeup(last->in6p_socket); 237 opts = NULL; 238 } 239 } 240 last = in6p; 241 } 242 #ifdef IPSEC 243 /* 244 * Check AH/ESP integrity. 245 */ 246 if (last && ipsec6_in_reject(m, last)) { 247 m_freem(m); 248 ipsec6stat.in_polvio++; 249 IP6_STATDEC(IP6_STAT_DELIVERED); 250 /* do not inject data into pcb */ 251 } else 252 #endif /* IPSEC */ 253 #ifdef FAST_IPSEC 254 if (last && ipsec6_in_reject(m, last)) { 255 m_freem(m); 256 /* 257 * XXX ipsec6_in_reject update stat if there is an error 258 * so we just need to update stats by hand in the case of last is 259 * NULL 260 */ 261 if (!last) 262 ipsec6stat.in_polvio++; 263 IP6_STATDEC(IP6_STAT_DELIVERED); 264 /* do not inject data into pcb */ 265 } else 266 #endif /* FAST_IPSEC */ 267 if (last) { 268 if (last->in6p_flags & IN6P_CONTROLOPTS) 269 ip6_savecontrol(last, &opts, ip6, m); 270 /* strip intermediate headers */ 271 m_adj(m, *offp); 272 if (sbappendaddr(&last->in6p_socket->so_rcv, 273 (struct sockaddr *)&rip6src, m, opts) == 0) { 274 m_freem(m); 275 if (opts) 276 m_freem(opts); 277 RIP6_STATINC(RIP6_STAT_FULLSOCK); 278 } else 279 sorwakeup(last->in6p_socket); 280 } else { 281 RIP6_STATINC(RIP6_STAT_NOSOCK); 282 if (m->m_flags & M_MCAST) 283 RIP6_STATINC(RIP6_STAT_NOSOCKMCAST); 284 if (proto == IPPROTO_NONE) 285 m_freem(m); 286 else { 287 u_int8_t *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */ 288 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_protounknown); 289 icmp6_error(m, ICMP6_PARAM_PROB, 290 ICMP6_PARAMPROB_NEXTHEADER, 291 prvnxtp - mtod(m, u_int8_t *)); 292 } 293 IP6_STATDEC(IP6_STAT_DELIVERED); 294 } 295 return IPPROTO_DONE; 296 } 297 298 void 299 rip6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 300 { 301 struct ip6_hdr *ip6; 302 struct ip6ctlparam *ip6cp = NULL; 303 const struct sockaddr_in6 *sa6_src = NULL; 304 void *cmdarg; 305 void (*notify)(struct in6pcb *, int) = in6_rtchange; 306 int nxt; 307 308 if (sa->sa_family != AF_INET6 || 309 sa->sa_len != sizeof(struct sockaddr_in6)) 310 return; 311 312 if ((unsigned)cmd >= PRC_NCMDS) 313 return; 314 if (PRC_IS_REDIRECT(cmd)) 315 notify = in6_rtchange, d = NULL; 316 else if (cmd == PRC_HOSTDEAD) 317 d = NULL; 318 else if (cmd == PRC_MSGSIZE) 319 ; /* special code is present, see below */ 320 else if (inet6ctlerrmap[cmd] == 0) 321 return; 322 323 /* if the parameter is from icmp6, decode it. */ 324 if (d != NULL) { 325 ip6cp = (struct ip6ctlparam *)d; 326 ip6 = ip6cp->ip6c_ip6; 327 cmdarg = ip6cp->ip6c_cmdarg; 328 sa6_src = ip6cp->ip6c_src; 329 nxt = ip6cp->ip6c_nxt; 330 } else { 331 ip6 = NULL; 332 cmdarg = NULL; 333 sa6_src = &sa6_any; 334 nxt = -1; 335 } 336 337 if (ip6 && cmd == PRC_MSGSIZE) { 338 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 339 int valid = 0; 340 struct in6pcb *in6p; 341 342 /* 343 * Check to see if we have a valid raw IPv6 socket 344 * corresponding to the address in the ICMPv6 message 345 * payload, and the protocol (ip6_nxt) meets the socket. 346 * XXX chase extension headers, or pass final nxt value 347 * from icmp6_notify_error() 348 */ 349 in6p = NULL; 350 in6p = in6_pcblookup_connect(&raw6cbtable, &sa6->sin6_addr, 0, 351 (const struct in6_addr *)&sa6_src->sin6_addr, 0, 0); 352 #if 0 353 if (!in6p) { 354 /* 355 * As the use of sendto(2) is fairly popular, 356 * we may want to allow non-connected pcb too. 357 * But it could be too weak against attacks... 358 * We should at least check if the local 359 * address (= s) is really ours. 360 */ 361 in6p = in6_pcblookup_bind(&raw6cbtable, 362 &sa6->sin6_addr, 0, 0); 363 } 364 #endif 365 366 if (in6p && in6p->in6p_ip6.ip6_nxt && 367 in6p->in6p_ip6.ip6_nxt == nxt) 368 valid++; 369 370 /* 371 * Depending on the value of "valid" and routing table 372 * size (mtudisc_{hi,lo}wat), we will: 373 * - recalculate the new MTU and create the 374 * corresponding routing entry, or 375 * - ignore the MTU change notification. 376 */ 377 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 378 379 /* 380 * regardless of if we called icmp6_mtudisc_update(), 381 * we need to call in6_pcbnotify(), to notify path MTU 382 * change to the userland (RFC3542), because some 383 * unconnected sockets may share the same destination 384 * and want to know the path MTU. 385 */ 386 } 387 388 (void) in6_pcbnotify(&raw6cbtable, sa, 0, 389 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 390 } 391 392 /* 393 * Generate IPv6 header and pass packet to ip6_output. 394 * Tack on options user may have setup with control call. 395 */ 396 int 397 rip6_output(struct mbuf *m, struct socket *so, struct sockaddr_in6 *dstsock, 398 struct mbuf *control) 399 { 400 struct in6_addr *dst; 401 struct ip6_hdr *ip6; 402 struct in6pcb *in6p; 403 u_int plen = m->m_pkthdr.len; 404 int error = 0; 405 struct ip6_pktopts opt, *optp = NULL; 406 struct ifnet *oifp = NULL; 407 int type, code; /* for ICMPv6 output statistics only */ 408 int priv = 0; 409 int scope_ambiguous = 0; 410 struct in6_addr *in6a; 411 412 in6p = sotoin6pcb(so); 413 414 priv = 0; 415 if (curlwp && !kauth_authorize_generic(curlwp->l_cred, 416 KAUTH_GENERIC_ISSUSER, NULL)) 417 priv = 1; 418 419 dst = &dstsock->sin6_addr; 420 if (control) { 421 if ((error = ip6_setpktopts(control, &opt, 422 in6p->in6p_outputopts, 423 priv, so->so_proto->pr_protocol)) != 0) { 424 goto bad; 425 } 426 optp = &opt; 427 } else 428 optp = in6p->in6p_outputopts; 429 430 /* 431 * Check and convert scope zone ID into internal form. 432 * XXX: we may still need to determine the zone later. 433 */ 434 if (!(so->so_state & SS_ISCONNECTED)) { 435 if (dstsock->sin6_scope_id == 0 && !ip6_use_defzone) 436 scope_ambiguous = 1; 437 if ((error = sa6_embedscope(dstsock, ip6_use_defzone)) != 0) 438 goto bad; 439 } 440 441 /* 442 * For an ICMPv6 packet, we should know its type and code 443 * to update statistics. 444 */ 445 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 446 struct icmp6_hdr *icmp6; 447 if (m->m_len < sizeof(struct icmp6_hdr) && 448 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { 449 error = ENOBUFS; 450 goto bad; 451 } 452 icmp6 = mtod(m, struct icmp6_hdr *); 453 type = icmp6->icmp6_type; 454 code = icmp6->icmp6_code; 455 } else { 456 type = 0; 457 code = 0; 458 } 459 460 M_PREPEND(m, sizeof(*ip6), M_DONTWAIT); 461 if (!m) { 462 error = ENOBUFS; 463 goto bad; 464 } 465 ip6 = mtod(m, struct ip6_hdr *); 466 467 /* 468 * Next header might not be ICMP6 but use its pseudo header anyway. 469 */ 470 ip6->ip6_dst = *dst; 471 472 /* 473 * Source address selection. 474 */ 475 if ((in6a = in6_selectsrc(dstsock, optp, in6p->in6p_moptions, 476 (struct route *)&in6p->in6p_route, &in6p->in6p_laddr, &oifp, 477 &error)) == 0) { 478 if (error == 0) 479 error = EADDRNOTAVAIL; 480 goto bad; 481 } 482 ip6->ip6_src = *in6a; 483 484 if (oifp && scope_ambiguous) { 485 /* 486 * Application should provide a proper zone ID or the use of 487 * default zone IDs should be enabled. Unfortunately, some 488 * applications do not behave as it should, so we need a 489 * workaround. Even if an appropriate ID is not determined 490 * (when it's required), if we can determine the outgoing 491 * interface. determine the zone ID based on the interface. 492 */ 493 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL); 494 if (error != 0) 495 goto bad; 496 } 497 ip6->ip6_dst = dstsock->sin6_addr; 498 499 /* fill in the rest of the IPv6 header fields */ 500 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK; 501 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 502 ip6->ip6_vfc |= IPV6_VERSION; 503 /* ip6_plen will be filled in ip6_output, so not fill it here. */ 504 ip6->ip6_nxt = in6p->in6p_ip6.ip6_nxt; 505 ip6->ip6_hlim = in6_selecthlim(in6p, oifp); 506 507 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 || 508 in6p->in6p_cksum != -1) { 509 int off; 510 u_int16_t sum; 511 512 /* compute checksum */ 513 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 514 off = offsetof(struct icmp6_hdr, icmp6_cksum); 515 else 516 off = in6p->in6p_cksum; 517 if (plen < off + 1) { 518 error = EINVAL; 519 goto bad; 520 } 521 off += sizeof(struct ip6_hdr); 522 523 sum = 0; 524 m = m_copyback_cow(m, off, sizeof(sum), (void *)&sum, 525 M_DONTWAIT); 526 if (m == NULL) { 527 error = ENOBUFS; 528 goto bad; 529 } 530 sum = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen); 531 m = m_copyback_cow(m, off, sizeof(sum), (void *)&sum, 532 M_DONTWAIT); 533 if (m == NULL) { 534 error = ENOBUFS; 535 goto bad; 536 } 537 } 538 539 error = ip6_output(m, optp, &in6p->in6p_route, 0, 540 in6p->in6p_moptions, so, &oifp); 541 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 542 if (oifp) 543 icmp6_ifoutstat_inc(oifp, type, code); 544 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 545 } else 546 RIP6_STATINC(RIP6_STAT_OPACKETS); 547 548 goto freectl; 549 550 bad: 551 if (m) 552 m_freem(m); 553 554 freectl: 555 if (control) { 556 ip6_clearpktopts(&opt, -1); 557 m_freem(control); 558 } 559 return error; 560 } 561 562 /* 563 * Raw IPv6 socket option processing. 564 */ 565 int 566 rip6_ctloutput(int op, struct socket *so, int level, int optname, 567 struct mbuf **mp) 568 { 569 int error = 0; 570 571 if (level == SOL_SOCKET && optname == SO_NOHEADER) { 572 /* need to fiddle w/ opt(IPPROTO_IPV6, IPV6_CHECKSUM)? */ 573 if (op == PRCO_GETOPT) { 574 *mp = m_intopt(so, 1); 575 return 0; 576 } else if (*mp == NULL || (*mp)->m_len != sizeof(int)) 577 error = EINVAL; 578 else if (*mtod(*mp, int *) == 0) 579 error = EINVAL; 580 goto free_m; 581 } else if (level != IPPROTO_IPV6) 582 return ip6_ctloutput(op, so, level, optname, mp); 583 584 switch (optname) { 585 case MRT6_INIT: 586 case MRT6_DONE: 587 case MRT6_ADD_MIF: 588 case MRT6_DEL_MIF: 589 case MRT6_ADD_MFC: 590 case MRT6_DEL_MFC: 591 case MRT6_PIM: 592 if (op == PRCO_SETOPT) 593 error = ip6_mrouter_set(optname, so, *mp); 594 else if (op == PRCO_GETOPT) 595 error = ip6_mrouter_get(optname, so, mp); 596 else 597 error = EINVAL; 598 break; 599 case IPV6_CHECKSUM: 600 return ip6_raw_ctloutput(op, so, level, optname, mp); 601 default: 602 return ip6_ctloutput(op, so, level, optname, mp); 603 } 604 free_m: 605 if (op == PRCO_SETOPT && *mp != NULL) 606 m_free(*mp); 607 return error; 608 } 609 610 extern u_long rip6_sendspace; 611 extern u_long rip6_recvspace; 612 613 int 614 rip6_usrreq(struct socket *so, int req, struct mbuf *m, 615 struct mbuf *nam, struct mbuf *control, struct lwp *l) 616 { 617 struct in6pcb *in6p = sotoin6pcb(so); 618 int s; 619 int error = 0; 620 int priv; 621 622 priv = 0; 623 if (l && !kauth_authorize_generic(l->l_cred, 624 KAUTH_GENERIC_ISSUSER, NULL)) 625 priv++; 626 627 if (req == PRU_CONTROL) 628 return in6_control(so, (u_long)m, (void *)nam, 629 (struct ifnet *)control, l); 630 631 if (req == PRU_PURGEIF) { 632 in6_pcbpurgeif0(&raw6cbtable, (struct ifnet *)control); 633 in6_purgeif((struct ifnet *)control); 634 in6_pcbpurgeif(&raw6cbtable, (struct ifnet *)control); 635 return 0; 636 } 637 638 switch (req) { 639 case PRU_ATTACH: 640 if (in6p != NULL) 641 panic("rip6_attach"); 642 if (!priv) { 643 error = EACCES; 644 break; 645 } 646 s = splsoftnet(); 647 error = soreserve(so, rip6_sendspace, rip6_recvspace); 648 if (error != 0) { 649 splx(s); 650 break; 651 } 652 if ((error = in6_pcballoc(so, &raw6cbtable)) != 0) { 653 splx(s); 654 break; 655 } 656 splx(s); 657 in6p = sotoin6pcb(so); 658 in6p->in6p_ip6.ip6_nxt = (long)nam; 659 in6p->in6p_cksum = -1; 660 661 MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *, 662 sizeof(struct icmp6_filter), M_PCB, M_NOWAIT); 663 if (in6p->in6p_icmp6filt == NULL) { 664 in6_pcbdetach(in6p); 665 error = ENOMEM; 666 break; 667 } 668 ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt); 669 break; 670 671 case PRU_DISCONNECT: 672 if ((so->so_state & SS_ISCONNECTED) == 0) { 673 error = ENOTCONN; 674 break; 675 } 676 in6p->in6p_faddr = in6addr_any; 677 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 678 break; 679 680 case PRU_ABORT: 681 soisdisconnected(so); 682 /* Fallthrough */ 683 case PRU_DETACH: 684 if (in6p == NULL) 685 panic("rip6_detach"); 686 if (so == ip6_mrouter) 687 ip6_mrouter_done(); 688 /* xxx: RSVP */ 689 if (in6p->in6p_icmp6filt != NULL) { 690 FREE(in6p->in6p_icmp6filt, M_PCB); 691 in6p->in6p_icmp6filt = NULL; 692 } 693 in6_pcbdetach(in6p); 694 break; 695 696 case PRU_BIND: 697 { 698 struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *); 699 struct ifaddr *ia = NULL; 700 701 if (nam->m_len != sizeof(*addr)) { 702 error = EINVAL; 703 break; 704 } 705 if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6) { 706 error = EADDRNOTAVAIL; 707 break; 708 } 709 if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0) 710 break; 711 712 /* 713 * we don't support mapped address here, it would confuse 714 * users so reject it 715 */ 716 if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) { 717 error = EADDRNOTAVAIL; 718 break; 719 } 720 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) && 721 (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0) { 722 error = EADDRNOTAVAIL; 723 break; 724 } 725 if (ia && ((struct in6_ifaddr *)ia)->ia6_flags & 726 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 727 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 728 error = EADDRNOTAVAIL; 729 break; 730 } 731 in6p->in6p_laddr = addr->sin6_addr; 732 break; 733 } 734 735 case PRU_CONNECT: 736 { 737 struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *); 738 struct in6_addr *in6a = NULL; 739 struct ifnet *ifp = NULL; 740 int scope_ambiguous = 0; 741 742 if (nam->m_len != sizeof(*addr)) { 743 error = EINVAL; 744 break; 745 } 746 if (TAILQ_EMPTY(&ifnet)) { 747 error = EADDRNOTAVAIL; 748 break; 749 } 750 if (addr->sin6_family != AF_INET6) { 751 error = EAFNOSUPPORT; 752 break; 753 } 754 755 /* 756 * Application should provide a proper zone ID or the use of 757 * default zone IDs should be enabled. Unfortunately, some 758 * applications do not behave as it should, so we need a 759 * workaround. Even if an appropriate ID is not determined, 760 * we'll see if we can determine the outgoing interface. If we 761 * can, determine the zone ID based on the interface below. 762 */ 763 if (addr->sin6_scope_id == 0 && !ip6_use_defzone) 764 scope_ambiguous = 1; 765 if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0) 766 return error; 767 768 /* Source address selection. XXX: need pcblookup? */ 769 in6a = in6_selectsrc(addr, in6p->in6p_outputopts, 770 in6p->in6p_moptions, (struct route *)&in6p->in6p_route, 771 &in6p->in6p_laddr, &ifp, &error); 772 if (in6a == NULL) { 773 if (error == 0) 774 error = EADDRNOTAVAIL; 775 break; 776 } 777 /* XXX: see above */ 778 if (ifp && scope_ambiguous && 779 (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) { 780 break; 781 } 782 in6p->in6p_laddr = *in6a; 783 in6p->in6p_faddr = addr->sin6_addr; 784 soisconnected(so); 785 break; 786 } 787 788 case PRU_CONNECT2: 789 error = EOPNOTSUPP; 790 break; 791 792 /* 793 * Mark the connection as being incapable of futther input. 794 */ 795 case PRU_SHUTDOWN: 796 socantsendmore(so); 797 break; 798 /* 799 * Ship a packet out. The appropriate raw output 800 * routine handles any messaging necessary. 801 */ 802 case PRU_SEND: 803 { 804 struct sockaddr_in6 tmp; 805 struct sockaddr_in6 *dst; 806 807 /* always copy sockaddr to avoid overwrites */ 808 if (so->so_state & SS_ISCONNECTED) { 809 if (nam) { 810 error = EISCONN; 811 break; 812 } 813 /* XXX */ 814 sockaddr_in6_init(&tmp, &in6p->in6p_faddr, 0, 0, 0); 815 dst = &tmp; 816 } else { 817 if (nam == NULL) { 818 error = ENOTCONN; 819 break; 820 } 821 if (nam->m_len != sizeof(tmp)) { 822 error = EINVAL; 823 break; 824 } 825 826 tmp = *mtod(nam, struct sockaddr_in6 *); 827 dst = &tmp; 828 829 if (dst->sin6_family != AF_INET6) { 830 error = EAFNOSUPPORT; 831 break; 832 } 833 } 834 error = rip6_output(m, so, dst, control); 835 m = NULL; 836 break; 837 } 838 839 case PRU_SENSE: 840 /* 841 * stat: don't bother with a blocksize 842 */ 843 return 0; 844 /* 845 * Not supported. 846 */ 847 case PRU_RCVOOB: 848 case PRU_RCVD: 849 case PRU_LISTEN: 850 case PRU_ACCEPT: 851 case PRU_SENDOOB: 852 error = EOPNOTSUPP; 853 break; 854 855 case PRU_SOCKADDR: 856 in6_setsockaddr(in6p, nam); 857 break; 858 859 case PRU_PEERADDR: 860 in6_setpeeraddr(in6p, nam); 861 break; 862 863 default: 864 panic("rip6_usrreq"); 865 } 866 if (m != NULL) 867 m_freem(m); 868 return error; 869 } 870 871 static void 872 rip6stat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci) 873 { 874 uint64_t *rip6sc = v1; 875 uint64_t *rip6s = v2; 876 u_int i; 877 878 for (i = 0; i < RIP6_NSTATS; i++) 879 rip6s[i] += rip6sc[i]; 880 } 881 882 static void 883 rip6stat_convert_to_user(uint64_t *rip6s) 884 { 885 886 memset(rip6s, 0, sizeof(uint64_t) * RIP6_NSTATS); 887 percpu_foreach(rip6stat_percpu, rip6stat_convert_to_user_cb, rip6s); 888 } 889 890 static int 891 sysctl_net_inet6_raw6_stats(SYSCTLFN_ARGS) 892 { 893 struct sysctlnode node; 894 uint64_t rip6s[RIP6_NSTATS]; 895 896 rip6stat_convert_to_user(rip6s); 897 node = *rnode; 898 node.sysctl_data = rip6s; 899 node.sysctl_size = sizeof(rip6s); 900 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 901 } 902 903 SYSCTL_SETUP(sysctl_net_inet6_raw6_setup, "sysctl net.inet6.raw6 subtree setup") 904 { 905 906 sysctl_createv(clog, 0, NULL, NULL, 907 CTLFLAG_PERMANENT, 908 CTLTYPE_NODE, "net", NULL, 909 NULL, 0, NULL, 0, 910 CTL_NET, CTL_EOL); 911 sysctl_createv(clog, 0, NULL, NULL, 912 CTLFLAG_PERMANENT, 913 CTLTYPE_NODE, "inet6", NULL, 914 NULL, 0, NULL, 0, 915 CTL_NET, PF_INET6, CTL_EOL); 916 sysctl_createv(clog, 0, NULL, NULL, 917 CTLFLAG_PERMANENT, 918 CTLTYPE_NODE, "raw6", 919 SYSCTL_DESCR("Raw IPv6 settings"), 920 NULL, 0, NULL, 0, 921 CTL_NET, PF_INET6, IPPROTO_RAW, CTL_EOL); 922 923 sysctl_createv(clog, 0, NULL, NULL, 924 CTLFLAG_PERMANENT, 925 CTLTYPE_STRUCT, "pcblist", 926 SYSCTL_DESCR("Raw IPv6 control block list"), 927 sysctl_inpcblist, 0, &raw6cbtable, 0, 928 CTL_NET, PF_INET6, IPPROTO_RAW, 929 CTL_CREATE, CTL_EOL); 930 sysctl_createv(clog, 0, NULL, NULL, 931 CTLFLAG_PERMANENT, 932 CTLTYPE_STRUCT, "stats", 933 SYSCTL_DESCR("Raw IPv6 statistics"), 934 sysctl_net_inet6_raw6_stats, 0, NULL, 0, 935 CTL_NET, PF_INET6, IPPROTO_RAW, RAW6CTL_STATS, 936 CTL_EOL); 937 } 938
Indexes created Wed Sep 24 05:09:52 GMT 2025