ip6_mroute.c revision 1.62
1 /* $NetBSD: ip6_mroute.c,v 1.62 2004/12/21 11:40:12 drochner Exp $ */ 2 /* $KAME: ip6_mroute.c,v 1.49 2001/07/25 09:21:18 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 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 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ 34 35 /* 36 * Copyright (c) 1992, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * Stephen Deering of Stanford University. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 67 */ 68 69 /* 70 * Copyright (c) 1989 Stephen Deering 71 * 72 * This code is derived from software contributed to Berkeley by 73 * Stephen Deering of Stanford University. 74 * 75 * Redistribution and use in source and binary forms, with or without 76 * modification, are permitted provided that the following conditions 77 * are met: 78 * 1. Redistributions of source code must retain the above copyright 79 * notice, this list of conditions and the following disclaimer. 80 * 2. Redistributions in binary form must reproduce the above copyright 81 * notice, this list of conditions and the following disclaimer in the 82 * documentation and/or other materials provided with the distribution. 83 * 3. All advertising materials mentioning features or use of this software 84 * must display the following acknowledgement: 85 * This product includes software developed by the University of 86 * California, Berkeley and its contributors. 87 * 4. Neither the name of the University nor the names of its contributors 88 * may be used to endorse or promote products derived from this software 89 * without specific prior written permission. 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 92 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 94 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 95 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 96 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 97 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 98 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 99 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 100 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 101 * SUCH DAMAGE. 102 * 103 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 104 */ 105 106 /* 107 * IP multicast forwarding procedures 108 * 109 * Written by David Waitzman, BBN Labs, August 1988. 110 * Modified by Steve Deering, Stanford, February 1989. 111 * Modified by Mark J. Steiglitz, Stanford, May, 1991 112 * Modified by Van Jacobson, LBL, January 1993 113 * Modified by Ajit Thyagarajan, PARC, August 1993 114 * Modified by Bill Fenner, PARC, April 1994 115 * 116 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 117 */ 118 119 #include <sys/cdefs.h> 120 __KERNEL_RCSID(0, "$NetBSD: ip6_mroute.c,v 1.62 2004/12/21 11:40:12 drochner Exp $"); 121 122 #include "opt_inet.h" 123 #include "opt_mrouting.h" 124 125 #include <sys/param.h> 126 #include <sys/systm.h> 127 #include <sys/callout.h> 128 #include <sys/mbuf.h> 129 #include <sys/socket.h> 130 #include <sys/socketvar.h> 131 #include <sys/sockio.h> 132 #include <sys/protosw.h> 133 #include <sys/errno.h> 134 #include <sys/time.h> 135 #include <sys/kernel.h> 136 #include <sys/ioctl.h> 137 #include <sys/syslog.h> 138 139 #include <net/if.h> 140 #include <net/route.h> 141 #include <net/raw_cb.h> 142 143 #include <netinet/in.h> 144 #include <netinet/in_var.h> 145 #ifdef MULTICAST_PMTUD 146 #include <netinet/icmp6.h> 147 #endif 148 149 #include <netinet/ip6.h> 150 #include <netinet6/ip6_var.h> 151 #include <netinet6/ip6_mroute.h> 152 #include <netinet6/pim6.h> 153 #include <netinet6/pim6_var.h> 154 #include <netinet6/nd6.h> 155 156 #include <net/net_osdep.h> 157 158 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 159 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 160 161 static int set_pim6 __P((int *)); 162 static int get_pim6 __P((struct mbuf *)); 163 static int socket_send __P((struct socket *, struct mbuf *, 164 struct sockaddr_in6 *)); 165 static int register_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 166 167 /* 168 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 169 * except for netstat or debugging purposes. 170 */ 171 struct socket *ip6_mrouter = NULL; 172 int ip6_mrouter_ver = 0; 173 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 174 struct mrt6stat mrt6stat; 175 176 #define NO_RTE_FOUND 0x1 177 #define RTE_FOUND 0x2 178 179 struct mf6c *mf6ctable[MF6CTBLSIZ]; 180 u_char n6expire[MF6CTBLSIZ]; 181 static struct mif6 mif6table[MAXMIFS]; 182 #ifdef MRT6DEBUG 183 u_int mrt6debug = 0; /* debug level */ 184 #define DEBUG_MFC 0x02 185 #define DEBUG_FORWARD 0x04 186 #define DEBUG_EXPIRE 0x08 187 #define DEBUG_XMIT 0x10 188 #define DEBUG_REG 0x20 189 #define DEBUG_PIM 0x40 190 #endif 191 192 static void expire_upcalls __P((void *)); 193 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 194 #define UPCALL_EXPIRE 6 /* number of timeouts */ 195 196 #ifdef INET 197 #ifdef MROUTING 198 extern struct socket *ip_mrouter; 199 #endif 200 #endif 201 202 /* 203 * 'Interfaces' associated with decapsulator (so we can tell 204 * packets that went through it from ones that get reflected 205 * by a broken gateway). These interfaces are never linked into 206 * the system ifnet list & no routes point to them. I.e., packets 207 * can't be sent this way. They only exist as a placeholder for 208 * multicast source verification. 209 */ 210 struct ifnet multicast_register_if; 211 212 #define ENCAP_HOPS 64 213 214 /* 215 * Private variables. 216 */ 217 static mifi_t nummifs = 0; 218 static mifi_t reg_mif_num = (mifi_t)-1; 219 220 struct pim6stat pim6stat; 221 static int pim6; 222 223 /* 224 * Hash function for a source, group entry 225 */ 226 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 227 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 228 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 229 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 230 231 /* 232 * Find a route for a given origin IPv6 address and Multicast group address. 233 * Quality of service parameter to be added in the future!!! 234 */ 235 236 #define MF6CFIND(o, g, rt) do { \ 237 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 238 rt = NULL; \ 239 mrt6stat.mrt6s_mfc_lookups++; \ 240 while (_rt) { \ 241 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 242 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 243 (_rt->mf6c_stall == NULL)) { \ 244 rt = _rt; \ 245 break; \ 246 } \ 247 _rt = _rt->mf6c_next; \ 248 } \ 249 if (rt == NULL) { \ 250 mrt6stat.mrt6s_mfc_misses++; \ 251 } \ 252 } while (/*CONSTCOND*/ 0) 253 254 /* 255 * Macros to compute elapsed time efficiently 256 * Borrowed from Van Jacobson's scheduling code 257 */ 258 #define TV_DELTA(a, b, delta) do { \ 259 int xxs; \ 260 \ 261 delta = (a).tv_usec - (b).tv_usec; \ 262 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 263 switch (xxs) { \ 264 case 2: \ 265 delta += 1000000; \ 266 /* FALLTHROUGH */ \ 267 case 1: \ 268 delta += 1000000; \ 269 break; \ 270 default: \ 271 delta += (1000000 * xxs); \ 272 } \ 273 } \ 274 } while (/*CONSTCOND*/ 0) 275 276 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 277 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 278 279 #ifdef UPCALL_TIMING 280 #define UPCALL_MAX 50 281 u_long upcall_data[UPCALL_MAX + 1]; 282 static void collate(); 283 #endif /* UPCALL_TIMING */ 284 285 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 286 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 287 static int ip6_mrouter_init __P((struct socket *, int, int)); 288 static int add_m6if __P((struct mif6ctl *)); 289 static int del_m6if __P((mifi_t *)); 290 static int add_m6fc __P((struct mf6cctl *)); 291 static int del_m6fc __P((struct mf6cctl *)); 292 293 static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER; 294 295 /* 296 * Handle MRT setsockopt commands to modify the multicast routing tables. 297 */ 298 int 299 ip6_mrouter_set(cmd, so, m) 300 int cmd; 301 struct socket *so; 302 struct mbuf *m; 303 { 304 if (cmd != MRT6_INIT && so != ip6_mrouter) 305 return (EACCES); 306 307 switch (cmd) { 308 #ifdef MRT6_OINIT 309 case MRT6_OINIT: 310 #endif 311 case MRT6_INIT: 312 if (m == NULL || m->m_len < sizeof(int)) 313 return (EINVAL); 314 return (ip6_mrouter_init(so, *mtod(m, int *), cmd)); 315 case MRT6_DONE: 316 return (ip6_mrouter_done()); 317 case MRT6_ADD_MIF: 318 if (m == NULL || m->m_len < sizeof(struct mif6ctl)) 319 return (EINVAL); 320 return (add_m6if(mtod(m, struct mif6ctl *))); 321 case MRT6_DEL_MIF: 322 if (m == NULL || m->m_len < sizeof(mifi_t)) 323 return (EINVAL); 324 return (del_m6if(mtod(m, mifi_t *))); 325 case MRT6_ADD_MFC: 326 if (m == NULL || m->m_len < sizeof(struct mf6cctl)) 327 return (EINVAL); 328 return (add_m6fc(mtod(m, struct mf6cctl *))); 329 case MRT6_DEL_MFC: 330 if (m == NULL || m->m_len < sizeof(struct mf6cctl)) 331 return (EINVAL); 332 return (del_m6fc(mtod(m, struct mf6cctl *))); 333 case MRT6_PIM: 334 if (m == NULL || m->m_len < sizeof(int)) 335 return (EINVAL); 336 return (set_pim6(mtod(m, int *))); 337 default: 338 return (EOPNOTSUPP); 339 } 340 } 341 342 /* 343 * Handle MRT getsockopt commands 344 */ 345 int 346 ip6_mrouter_get(cmd, so, m) 347 int cmd; 348 struct socket *so; 349 struct mbuf **m; 350 { 351 struct mbuf *mb; 352 353 if (so != ip6_mrouter) return EACCES; 354 355 *m = mb = m_get(M_WAIT, MT_SOOPTS); 356 357 switch (cmd) { 358 case MRT6_PIM: 359 return get_pim6(mb); 360 default: 361 m_free(mb); 362 return EOPNOTSUPP; 363 } 364 } 365 366 /* 367 * Handle ioctl commands to obtain information from the cache 368 */ 369 int 370 mrt6_ioctl(cmd, data) 371 int cmd; 372 caddr_t data; 373 { 374 375 switch (cmd) { 376 case SIOCGETSGCNT_IN6: 377 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 378 case SIOCGETMIFCNT_IN6: 379 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 380 default: 381 return (EINVAL); 382 } 383 } 384 385 /* 386 * returns the packet, byte, rpf-failure count for the source group provided 387 */ 388 static int 389 get_sg_cnt(req) 390 struct sioc_sg_req6 *req; 391 { 392 struct mf6c *rt; 393 int s; 394 395 s = splsoftnet(); 396 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 397 splx(s); 398 if (rt != NULL) { 399 req->pktcnt = rt->mf6c_pkt_cnt; 400 req->bytecnt = rt->mf6c_byte_cnt; 401 req->wrong_if = rt->mf6c_wrong_if; 402 } else 403 return (ESRCH); 404 #if 0 405 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 406 #endif 407 408 return 0; 409 } 410 411 /* 412 * returns the input and output packet and byte counts on the mif provided 413 */ 414 static int 415 get_mif6_cnt(req) 416 struct sioc_mif_req6 *req; 417 { 418 mifi_t mifi = req->mifi; 419 420 if (mifi >= nummifs) 421 return EINVAL; 422 423 req->icount = mif6table[mifi].m6_pkt_in; 424 req->ocount = mif6table[mifi].m6_pkt_out; 425 req->ibytes = mif6table[mifi].m6_bytes_in; 426 req->obytes = mif6table[mifi].m6_bytes_out; 427 428 return 0; 429 } 430 431 /* 432 * Get PIM processiong global 433 */ 434 static int 435 get_pim6(m) 436 struct mbuf *m; 437 { 438 int *i; 439 440 i = mtod(m, int *); 441 442 *i = pim6; 443 444 return 0; 445 } 446 447 static int 448 set_pim6(i) 449 int *i; 450 { 451 if ((*i != 1) && (*i != 0)) 452 return EINVAL; 453 454 pim6 = *i; 455 456 return 0; 457 } 458 459 /* 460 * Enable multicast routing 461 */ 462 static int 463 ip6_mrouter_init(so, v, cmd) 464 struct socket *so; 465 int v; 466 int cmd; 467 { 468 #ifdef MRT6DEBUG 469 if (mrt6debug) 470 log(LOG_DEBUG, 471 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 472 so->so_type, so->so_proto->pr_protocol); 473 #endif 474 475 if (so->so_type != SOCK_RAW || 476 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 477 return (EOPNOTSUPP); 478 479 if (v != 1) 480 return (ENOPROTOOPT); 481 482 if (ip6_mrouter != NULL) 483 return (EADDRINUSE); 484 485 ip6_mrouter = so; 486 ip6_mrouter_ver = cmd; 487 488 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 489 bzero((caddr_t)n6expire, sizeof(n6expire)); 490 491 pim6 = 0;/* used for stubbing out/in pim stuff */ 492 493 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 494 expire_upcalls, NULL); 495 496 #ifdef MRT6DEBUG 497 if (mrt6debug) 498 log(LOG_DEBUG, "ip6_mrouter_init\n"); 499 #endif 500 501 return 0; 502 } 503 504 /* 505 * Disable multicast routing 506 */ 507 int 508 ip6_mrouter_done() 509 { 510 mifi_t mifi; 511 int i; 512 struct ifnet *ifp; 513 struct in6_ifreq ifr; 514 struct mf6c *rt; 515 struct rtdetq *rte; 516 int s; 517 518 s = splsoftnet(); 519 520 /* 521 * For each phyint in use, disable promiscuous reception of all IPv6 522 * multicasts. 523 */ 524 #ifdef INET 525 #ifdef MROUTING 526 /* 527 * If there is still IPv4 multicast routing daemon, 528 * we remain interfaces to receive all muliticasted packets. 529 * XXX: there may be an interface in which the IPv4 multicast 530 * daemon is not interested... 531 */ 532 if (!ip_mrouter) 533 #endif 534 #endif 535 { 536 for (mifi = 0; mifi < nummifs; mifi++) { 537 if (mif6table[mifi].m6_ifp && 538 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 539 ifr.ifr_addr.sin6_family = AF_INET6; 540 ifr.ifr_addr.sin6_addr= in6addr_any; 541 ifp = mif6table[mifi].m6_ifp; 542 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 543 (caddr_t)&ifr); 544 } 545 } 546 } 547 #ifdef notyet 548 bzero((caddr_t)qtable, sizeof(qtable)); 549 bzero((caddr_t)tbftable, sizeof(tbftable)); 550 #endif 551 bzero((caddr_t)mif6table, sizeof(mif6table)); 552 nummifs = 0; 553 554 pim6 = 0; /* used to stub out/in pim specific code */ 555 556 callout_stop(&expire_upcalls_ch); 557 558 /* 559 * Free all multicast forwarding cache entries. 560 */ 561 for (i = 0; i < MF6CTBLSIZ; i++) { 562 rt = mf6ctable[i]; 563 while (rt) { 564 struct mf6c *frt; 565 566 for (rte = rt->mf6c_stall; rte != NULL; ) { 567 struct rtdetq *n = rte->next; 568 569 m_free(rte->m); 570 free(rte, M_MRTABLE); 571 rte = n; 572 } 573 frt = rt; 574 rt = rt->mf6c_next; 575 free(frt, M_MRTABLE); 576 } 577 } 578 579 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 580 581 /* 582 * Reset de-encapsulation cache 583 */ 584 reg_mif_num = -1; 585 586 ip6_mrouter = NULL; 587 ip6_mrouter_ver = 0; 588 589 splx(s); 590 591 #ifdef MRT6DEBUG 592 if (mrt6debug) 593 log(LOG_DEBUG, "ip6_mrouter_done\n"); 594 #endif 595 596 return 0; 597 } 598 599 void 600 ip6_mrouter_detach(ifp) 601 struct ifnet *ifp; 602 { 603 struct rtdetq *rte; 604 struct mf6c *mfc; 605 mifi_t mifi; 606 int i; 607 608 /* 609 * Delete a mif which points to ifp. 610 */ 611 for (mifi = 0; mifi < nummifs; mifi++) 612 if (mif6table[mifi].m6_ifp == ifp) 613 del_m6if(&mifi); 614 615 /* 616 * Clear rte->ifp of cache entries received on ifp. 617 */ 618 for (i = 0; i < MF6CTBLSIZ; i++) { 619 if (n6expire[i] == 0) 620 continue; 621 622 for (mfc = mf6ctable[i]; mfc != NULL; mfc = mfc->mf6c_next) { 623 for (rte = mfc->mf6c_stall; rte != NULL; rte = rte->next) { 624 if (rte->ifp == ifp) 625 rte->ifp = NULL; 626 } 627 } 628 } 629 } 630 631 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 632 633 /* 634 * Add a mif to the mif table 635 */ 636 static int 637 add_m6if(mifcp) 638 struct mif6ctl *mifcp; 639 { 640 struct mif6 *mifp; 641 struct ifnet *ifp; 642 struct in6_ifreq ifr; 643 int error, s; 644 #ifdef notyet 645 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 646 #endif 647 648 if (mifcp->mif6c_mifi >= MAXMIFS) 649 return EINVAL; 650 mifp = mif6table + mifcp->mif6c_mifi; 651 if (mifp->m6_ifp) 652 return EADDRINUSE; /* XXX: is it appropriate? */ 653 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi >= if_indexlim) 654 return ENXIO; 655 /* 656 * XXX: some OSes can remove ifp and clear ifindex2ifnet[id] 657 * even for id between 0 and if_index. 658 */ 659 if ((ifp = ifindex2ifnet[mifcp->mif6c_pifi]) == NULL) 660 return ENXIO; 661 662 if (mifcp->mif6c_flags & MIFF_REGISTER) { 663 if (reg_mif_num == (mifi_t)-1) { 664 strlcpy(multicast_register_if.if_xname, 665 "register_mif", 666 sizeof(multicast_register_if.if_xname)); 667 multicast_register_if.if_flags |= IFF_LOOPBACK; 668 multicast_register_if.if_index = mifcp->mif6c_mifi; 669 reg_mif_num = mifcp->mif6c_mifi; 670 } 671 672 ifp = &multicast_register_if; 673 674 } /* if REGISTER */ 675 else { 676 /* Make sure the interface supports multicast */ 677 if ((ifp->if_flags & IFF_MULTICAST) == 0) 678 return EOPNOTSUPP; 679 680 s = splsoftnet(); 681 /* 682 * Enable promiscuous reception of all IPv6 multicasts 683 * from the interface. 684 */ 685 ifr.ifr_addr.sin6_family = AF_INET6; 686 ifr.ifr_addr.sin6_addr = in6addr_any; 687 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 688 splx(s); 689 if (error) 690 return error; 691 } 692 693 s = splsoftnet(); 694 mifp->m6_flags = mifcp->mif6c_flags; 695 mifp->m6_ifp = ifp; 696 #ifdef notyet 697 /* scaling up here allows division by 1024 in critical code */ 698 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 699 #endif 700 /* initialize per mif pkt counters */ 701 mifp->m6_pkt_in = 0; 702 mifp->m6_pkt_out = 0; 703 mifp->m6_bytes_in = 0; 704 mifp->m6_bytes_out = 0; 705 splx(s); 706 707 /* Adjust nummifs up if the mifi is higher than nummifs */ 708 if (nummifs <= mifcp->mif6c_mifi) 709 nummifs = mifcp->mif6c_mifi + 1; 710 711 #ifdef MRT6DEBUG 712 if (mrt6debug) 713 log(LOG_DEBUG, 714 "add_mif #%d, phyint %s%d\n", 715 mifcp->mif6c_mifi, 716 ifp->if_name, ifp->if_unit); 717 #endif 718 719 return 0; 720 } 721 722 /* 723 * Delete a mif from the mif table 724 */ 725 static int 726 del_m6if(mifip) 727 mifi_t *mifip; 728 { 729 struct mif6 *mifp = mif6table + *mifip; 730 mifi_t mifi; 731 struct ifnet *ifp; 732 struct in6_ifreq ifr; 733 int s; 734 735 if (*mifip >= nummifs) 736 return EINVAL; 737 if (mifp->m6_ifp == NULL) 738 return EINVAL; 739 740 s = splsoftnet(); 741 742 if (!(mifp->m6_flags & MIFF_REGISTER)) { 743 /* 744 * XXX: what if there is yet IPv4 multicast daemon 745 * using the interface? 746 */ 747 ifp = mifp->m6_ifp; 748 749 ifr.ifr_addr.sin6_family = AF_INET6; 750 ifr.ifr_addr.sin6_addr = in6addr_any; 751 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 752 } 753 754 #ifdef notyet 755 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 756 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 757 #endif 758 bzero((caddr_t)mifp, sizeof (*mifp)); 759 760 /* Adjust nummifs down */ 761 for (mifi = nummifs; mifi > 0; mifi--) 762 if (mif6table[mifi - 1].m6_ifp) 763 break; 764 nummifs = mifi; 765 766 splx(s); 767 768 #ifdef MRT6DEBUG 769 if (mrt6debug) 770 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 771 #endif 772 773 return 0; 774 } 775 776 /* 777 * Add an mfc entry 778 */ 779 static int 780 add_m6fc(mfccp) 781 struct mf6cctl *mfccp; 782 { 783 struct mf6c *rt; 784 u_long hash; 785 struct rtdetq *rte; 786 u_short nstl; 787 int s; 788 789 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 790 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 791 792 /* If an entry already exists, just update the fields */ 793 if (rt) { 794 #ifdef MRT6DEBUG 795 if (mrt6debug & DEBUG_MFC) 796 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 797 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 798 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 799 mfccp->mf6cc_parent); 800 #endif 801 802 s = splsoftnet(); 803 rt->mf6c_parent = mfccp->mf6cc_parent; 804 rt->mf6c_ifset = mfccp->mf6cc_ifset; 805 splx(s); 806 return 0; 807 } 808 809 /* 810 * Find the entry for which the upcall was made and update 811 */ 812 s = splsoftnet(); 813 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 814 mfccp->mf6cc_mcastgrp.sin6_addr); 815 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 816 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 817 &mfccp->mf6cc_origin.sin6_addr) && 818 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 819 &mfccp->mf6cc_mcastgrp.sin6_addr) && 820 (rt->mf6c_stall != NULL)) { 821 822 if (nstl++) 823 log(LOG_ERR, 824 "add_m6fc: %s o %s g %s p %x dbx %p\n", 825 "multiple kernel entries", 826 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 827 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 828 mfccp->mf6cc_parent, rt->mf6c_stall); 829 830 #ifdef MRT6DEBUG 831 if (mrt6debug & DEBUG_MFC) 832 log(LOG_DEBUG, 833 "add_m6fc o %s g %s p %x dbg %x\n", 834 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 835 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 836 mfccp->mf6cc_parent, rt->mf6c_stall); 837 #endif 838 839 rt->mf6c_origin = mfccp->mf6cc_origin; 840 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 841 rt->mf6c_parent = mfccp->mf6cc_parent; 842 rt->mf6c_ifset = mfccp->mf6cc_ifset; 843 /* initialize pkt counters per src-grp */ 844 rt->mf6c_pkt_cnt = 0; 845 rt->mf6c_byte_cnt = 0; 846 rt->mf6c_wrong_if = 0; 847 848 rt->mf6c_expire = 0; /* Don't clean this guy up */ 849 n6expire[hash]--; 850 851 /* free packets Qed at the end of this entry */ 852 for (rte = rt->mf6c_stall; rte != NULL; ) { 853 struct rtdetq *n = rte->next; 854 if (rte->ifp) { 855 ip6_mdq(rte->m, rte->ifp, rt); 856 } 857 m_freem(rte->m); 858 #ifdef UPCALL_TIMING 859 collate(&(rte->t)); 860 #endif /* UPCALL_TIMING */ 861 free(rte, M_MRTABLE); 862 rte = n; 863 } 864 rt->mf6c_stall = NULL; 865 } 866 } 867 868 /* 869 * It is possible that an entry is being inserted without an upcall 870 */ 871 if (nstl == 0) { 872 #ifdef MRT6DEBUG 873 if (mrt6debug & DEBUG_MFC) 874 log(LOG_DEBUG, 875 "add_mfc no upcall h %d o %s g %s p %x\n", 876 hash, 877 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 878 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 879 mfccp->mf6cc_parent); 880 #endif 881 882 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 883 884 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 885 &mfccp->mf6cc_origin.sin6_addr)&& 886 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 887 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 888 889 rt->mf6c_origin = mfccp->mf6cc_origin; 890 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 891 rt->mf6c_parent = mfccp->mf6cc_parent; 892 rt->mf6c_ifset = mfccp->mf6cc_ifset; 893 /* initialize pkt counters per src-grp */ 894 rt->mf6c_pkt_cnt = 0; 895 rt->mf6c_byte_cnt = 0; 896 rt->mf6c_wrong_if = 0; 897 898 if (rt->mf6c_expire) 899 n6expire[hash]--; 900 rt->mf6c_expire = 0; 901 } 902 } 903 if (rt == NULL) { 904 /* no upcall, so make a new entry */ 905 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 906 M_NOWAIT); 907 if (rt == NULL) { 908 splx(s); 909 return ENOBUFS; 910 } 911 912 /* insert new entry at head of hash chain */ 913 rt->mf6c_origin = mfccp->mf6cc_origin; 914 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 915 rt->mf6c_parent = mfccp->mf6cc_parent; 916 rt->mf6c_ifset = mfccp->mf6cc_ifset; 917 /* initialize pkt counters per src-grp */ 918 rt->mf6c_pkt_cnt = 0; 919 rt->mf6c_byte_cnt = 0; 920 rt->mf6c_wrong_if = 0; 921 rt->mf6c_expire = 0; 922 rt->mf6c_stall = NULL; 923 924 /* link into table */ 925 rt->mf6c_next = mf6ctable[hash]; 926 mf6ctable[hash] = rt; 927 } 928 } 929 splx(s); 930 return 0; 931 } 932 933 #ifdef UPCALL_TIMING 934 /* 935 * collect delay statistics on the upcalls 936 */ 937 static void 938 collate(t) 939 struct timeval *t; 940 { 941 u_long d; 942 struct timeval tp; 943 u_long delta; 944 945 GET_TIME(tp); 946 947 if (TV_LT(*t, tp)) 948 { 949 TV_DELTA(tp, *t, delta); 950 951 d = delta >> 10; 952 if (d > UPCALL_MAX) 953 d = UPCALL_MAX; 954 955 ++upcall_data[d]; 956 } 957 } 958 #endif /* UPCALL_TIMING */ 959 960 /* 961 * Delete an mfc entry 962 */ 963 static int 964 del_m6fc(mfccp) 965 struct mf6cctl *mfccp; 966 { 967 struct sockaddr_in6 origin; 968 struct sockaddr_in6 mcastgrp; 969 struct mf6c *rt; 970 struct mf6c **nptr; 971 u_long hash; 972 int s; 973 974 origin = mfccp->mf6cc_origin; 975 mcastgrp = mfccp->mf6cc_mcastgrp; 976 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 977 978 #ifdef MRT6DEBUG 979 if (mrt6debug & DEBUG_MFC) 980 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 981 ip6_sprintf(&origin.sin6_addr), 982 ip6_sprintf(&mcastgrp.sin6_addr)); 983 #endif 984 985 s = splsoftnet(); 986 987 nptr = &mf6ctable[hash]; 988 while ((rt = *nptr) != NULL) { 989 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 990 &rt->mf6c_origin.sin6_addr) && 991 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 992 &rt->mf6c_mcastgrp.sin6_addr) && 993 rt->mf6c_stall == NULL) 994 break; 995 996 nptr = &rt->mf6c_next; 997 } 998 if (rt == NULL) { 999 splx(s); 1000 return EADDRNOTAVAIL; 1001 } 1002 1003 *nptr = rt->mf6c_next; 1004 free(rt, M_MRTABLE); 1005 1006 splx(s); 1007 1008 return 0; 1009 } 1010 1011 static int 1012 socket_send(s, mm, src) 1013 struct socket *s; 1014 struct mbuf *mm; 1015 struct sockaddr_in6 *src; 1016 { 1017 if (s) { 1018 if (sbappendaddr(&s->so_rcv, 1019 (struct sockaddr *)src, 1020 mm, (struct mbuf *)0) != 0) { 1021 sorwakeup(s); 1022 return 0; 1023 } 1024 } 1025 m_freem(mm); 1026 return -1; 1027 } 1028 1029 /* 1030 * IPv6 multicast forwarding function. This function assumes that the packet 1031 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1032 * pointed to by "ifp", and the packet is to be relayed to other networks 1033 * that have members of the packet's destination IPv6 multicast group. 1034 * 1035 * The packet is returned unscathed to the caller, unless it is 1036 * erroneous, in which case a non-zero return value tells the caller to 1037 * discard it. 1038 */ 1039 1040 int 1041 ip6_mforward(ip6, ifp, m) 1042 struct ip6_hdr *ip6; 1043 struct ifnet *ifp; 1044 struct mbuf *m; 1045 { 1046 struct mf6c *rt; 1047 struct mif6 *mifp; 1048 struct mbuf *mm; 1049 int s; 1050 mifi_t mifi; 1051 1052 #ifdef MRT6DEBUG 1053 if (mrt6debug & DEBUG_FORWARD) 1054 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1055 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 1056 ifp->if_index); 1057 #endif 1058 1059 /* 1060 * Don't forward a packet with Hop limit of zero or one, 1061 * or a packet destined to a local-only group. 1062 */ 1063 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 1064 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1065 return 0; 1066 ip6->ip6_hlim--; 1067 1068 /* 1069 * Source address check: do not forward packets with unspecified 1070 * source. It was discussed in July 2000, on ipngwg mailing list. 1071 * This is rather more serious than unicast cases, because some 1072 * MLD packets can be sent with the unspecified source address 1073 * (although such packets must normally set 1 to the hop limit field). 1074 */ 1075 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1076 ip6stat.ip6s_cantforward++; 1077 if (ip6_log_time + ip6_log_interval < time.tv_sec) { 1078 ip6_log_time = time.tv_sec; 1079 log(LOG_DEBUG, 1080 "cannot forward " 1081 "from %s to %s nxt %d received on %s\n", 1082 ip6_sprintf(&ip6->ip6_src), 1083 ip6_sprintf(&ip6->ip6_dst), 1084 ip6->ip6_nxt, 1085 m->m_pkthdr.rcvif ? 1086 if_name(m->m_pkthdr.rcvif) : "?"); 1087 } 1088 return 0; 1089 } 1090 1091 /* 1092 * Determine forwarding mifs from the forwarding cache table 1093 */ 1094 s = splsoftnet(); 1095 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1096 1097 /* Entry exists, so forward if necessary */ 1098 if (rt) { 1099 splx(s); 1100 return (ip6_mdq(m, ifp, rt)); 1101 } else { 1102 /* 1103 * If we don't have a route for packet's origin, 1104 * Make a copy of the packet & 1105 * send message to routing daemon 1106 */ 1107 1108 struct mbuf *mb0; 1109 struct rtdetq *rte; 1110 u_long hash; 1111 /* int i, npkts;*/ 1112 #ifdef UPCALL_TIMING 1113 struct timeval tp; 1114 1115 GET_TIME(tp); 1116 #endif /* UPCALL_TIMING */ 1117 1118 mrt6stat.mrt6s_no_route++; 1119 #ifdef MRT6DEBUG 1120 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1121 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1122 ip6_sprintf(&ip6->ip6_src), 1123 ip6_sprintf(&ip6->ip6_dst)); 1124 #endif 1125 1126 /* 1127 * Allocate mbufs early so that we don't do extra work if we 1128 * are just going to fail anyway. 1129 */ 1130 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1131 M_NOWAIT); 1132 if (rte == NULL) { 1133 splx(s); 1134 return ENOBUFS; 1135 } 1136 mb0 = m_copy(m, 0, M_COPYALL); 1137 /* 1138 * Pullup packet header if needed before storing it, 1139 * as other references may modify it in the meantime. 1140 */ 1141 if (mb0 && 1142 (M_READONLY(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1143 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1144 if (mb0 == NULL) { 1145 free(rte, M_MRTABLE); 1146 splx(s); 1147 return ENOBUFS; 1148 } 1149 1150 /* is there an upcall waiting for this packet? */ 1151 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1152 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1153 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1154 &rt->mf6c_origin.sin6_addr) && 1155 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1156 &rt->mf6c_mcastgrp.sin6_addr) && 1157 (rt->mf6c_stall != NULL)) 1158 break; 1159 } 1160 1161 if (rt == NULL) { 1162 struct mrt6msg *im; 1163 struct omrt6msg *oim; 1164 1165 /* no upcall, so make a new entry */ 1166 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1167 M_NOWAIT); 1168 if (rt == NULL) { 1169 free(rte, M_MRTABLE); 1170 m_freem(mb0); 1171 splx(s); 1172 return ENOBUFS; 1173 } 1174 /* 1175 * Make a copy of the header to send to the user 1176 * level process 1177 */ 1178 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1179 1180 if (mm == NULL) { 1181 free(rte, M_MRTABLE); 1182 m_freem(mb0); 1183 free(rt, M_MRTABLE); 1184 splx(s); 1185 return ENOBUFS; 1186 } 1187 1188 /* 1189 * Send message to routing daemon 1190 */ 1191 sin6.sin6_addr = ip6->ip6_src; 1192 1193 im = NULL; 1194 oim = NULL; 1195 switch (ip6_mrouter_ver) { 1196 case MRT6_OINIT: 1197 oim = mtod(mm, struct omrt6msg *); 1198 oim->im6_msgtype = MRT6MSG_NOCACHE; 1199 oim->im6_mbz = 0; 1200 break; 1201 case MRT6_INIT: 1202 im = mtod(mm, struct mrt6msg *); 1203 im->im6_msgtype = MRT6MSG_NOCACHE; 1204 im->im6_mbz = 0; 1205 break; 1206 default: 1207 free(rte, M_MRTABLE); 1208 m_freem(mb0); 1209 free(rt, M_MRTABLE); 1210 splx(s); 1211 return EINVAL; 1212 } 1213 1214 #ifdef MRT6DEBUG 1215 if (mrt6debug & DEBUG_FORWARD) 1216 log(LOG_DEBUG, 1217 "getting the iif info in the kernel\n"); 1218 #endif 1219 1220 for (mifp = mif6table, mifi = 0; 1221 mifi < nummifs && mifp->m6_ifp != ifp; 1222 mifp++, mifi++) 1223 ; 1224 1225 switch (ip6_mrouter_ver) { 1226 case MRT6_OINIT: 1227 oim->im6_mif = mifi; 1228 break; 1229 case MRT6_INIT: 1230 im->im6_mif = mifi; 1231 break; 1232 } 1233 1234 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1235 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1236 "socket queue full\n"); 1237 mrt6stat.mrt6s_upq_sockfull++; 1238 free(rte, M_MRTABLE); 1239 m_freem(mb0); 1240 free(rt, M_MRTABLE); 1241 splx(s); 1242 return ENOBUFS; 1243 } 1244 1245 mrt6stat.mrt6s_upcalls++; 1246 1247 /* insert new entry at head of hash chain */ 1248 bzero(rt, sizeof(*rt)); 1249 rt->mf6c_origin.sin6_family = AF_INET6; 1250 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1251 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1252 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1253 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1254 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1255 rt->mf6c_expire = UPCALL_EXPIRE; 1256 n6expire[hash]++; 1257 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1258 1259 /* link into table */ 1260 rt->mf6c_next = mf6ctable[hash]; 1261 mf6ctable[hash] = rt; 1262 /* Add this entry to the end of the queue */ 1263 rt->mf6c_stall = rte; 1264 } else { 1265 /* determine if q has overflowed */ 1266 struct rtdetq **p; 1267 int npkts = 0; 1268 1269 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1270 if (++npkts > MAX_UPQ6) { 1271 mrt6stat.mrt6s_upq_ovflw++; 1272 free(rte, M_MRTABLE); 1273 m_freem(mb0); 1274 splx(s); 1275 return 0; 1276 } 1277 1278 /* Add this entry to the end of the queue */ 1279 *p = rte; 1280 } 1281 1282 rte->next = NULL; 1283 rte->m = mb0; 1284 rte->ifp = ifp; 1285 #ifdef UPCALL_TIMING 1286 rte->t = tp; 1287 #endif /* UPCALL_TIMING */ 1288 1289 splx(s); 1290 1291 return 0; 1292 } 1293 } 1294 1295 /* 1296 * Clean up cache entries if upcalls are not serviced 1297 * Call from the Slow Timeout mechanism, every half second. 1298 */ 1299 static void 1300 expire_upcalls(unused) 1301 void *unused; 1302 { 1303 struct rtdetq *rte; 1304 struct mf6c *mfc, **nptr; 1305 int i; 1306 int s; 1307 1308 s = splsoftnet(); 1309 for (i = 0; i < MF6CTBLSIZ; i++) { 1310 if (n6expire[i] == 0) 1311 continue; 1312 nptr = &mf6ctable[i]; 1313 while ((mfc = *nptr) != NULL) { 1314 rte = mfc->mf6c_stall; 1315 /* 1316 * Skip real cache entries 1317 * Make sure it wasn't marked to not expire (shouldn't happen) 1318 * If it expires now 1319 */ 1320 if (rte != NULL && 1321 mfc->mf6c_expire != 0 && 1322 --mfc->mf6c_expire == 0) { 1323 #ifdef MRT6DEBUG 1324 if (mrt6debug & DEBUG_EXPIRE) 1325 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1326 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1327 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1328 #endif 1329 /* 1330 * drop all the packets 1331 * free the mbuf with the pkt, if, timing info 1332 */ 1333 do { 1334 struct rtdetq *n = rte->next; 1335 m_freem(rte->m); 1336 free(rte, M_MRTABLE); 1337 rte = n; 1338 } while (rte != NULL); 1339 mrt6stat.mrt6s_cache_cleanups++; 1340 n6expire[i]--; 1341 1342 *nptr = mfc->mf6c_next; 1343 free(mfc, M_MRTABLE); 1344 } else { 1345 nptr = &mfc->mf6c_next; 1346 } 1347 } 1348 } 1349 splx(s); 1350 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1351 expire_upcalls, NULL); 1352 } 1353 1354 /* 1355 * Packet forwarding routine once entry in the cache is made 1356 */ 1357 static int 1358 ip6_mdq(m, ifp, rt) 1359 struct mbuf *m; 1360 struct ifnet *ifp; 1361 struct mf6c *rt; 1362 { 1363 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1364 mifi_t mifi, iif; 1365 struct mif6 *mifp; 1366 int plen = m->m_pkthdr.len; 1367 1368 /* 1369 * Macro to send packet on mif. Since RSVP packets don't get counted on 1370 * input, they shouldn't get counted on output, so statistics keeping is 1371 * separate. 1372 */ 1373 1374 #define MC6_SEND(ip6, mifp, m) do { \ 1375 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1376 register_send((ip6), (mifp), (m)); \ 1377 else \ 1378 phyint_send((ip6), (mifp), (m)); \ 1379 } while (/*CONSTCOND*/ 0) 1380 1381 /* 1382 * Don't forward if it didn't arrive from the parent mif 1383 * for its origin. 1384 */ 1385 mifi = rt->mf6c_parent; 1386 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1387 /* came in the wrong interface */ 1388 #ifdef MRT6DEBUG 1389 if (mrt6debug & DEBUG_FORWARD) 1390 log(LOG_DEBUG, 1391 "wrong if: ifid %d mifi %d mififid %x\n", 1392 ifp->if_index, mifi, 1393 mif6table[mifi].m6_ifp ? 1394 mif6table[mifi].m6_ifp->if_index : -1); 1395 #endif 1396 mrt6stat.mrt6s_wrong_if++; 1397 rt->mf6c_wrong_if++; 1398 /* 1399 * If we are doing PIM processing, and we are forwarding 1400 * packets on this interface, send a message to the 1401 * routing daemon. 1402 */ 1403 /* have to make sure this is a valid mif */ 1404 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1405 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1406 /* 1407 * Check the M_LOOP flag to avoid an 1408 * unnecessary PIM assert. 1409 * XXX: M_LOOP is an ad-hoc hack... 1410 */ 1411 static struct sockaddr_in6 sin6 = 1412 { sizeof(sin6), AF_INET6 }; 1413 1414 struct mbuf *mm; 1415 struct mrt6msg *im; 1416 struct omrt6msg *oim; 1417 1418 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1419 if (mm && 1420 (M_READONLY(mm) || 1421 mm->m_len < sizeof(struct ip6_hdr))) 1422 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1423 if (mm == NULL) 1424 return ENOBUFS; 1425 1426 oim = NULL; 1427 im = NULL; 1428 switch (ip6_mrouter_ver) { 1429 case MRT6_OINIT: 1430 oim = mtod(mm, struct omrt6msg *); 1431 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1432 oim->im6_mbz = 0; 1433 break; 1434 case MRT6_INIT: 1435 im = mtod(mm, struct mrt6msg *); 1436 im->im6_msgtype = MRT6MSG_WRONGMIF; 1437 im->im6_mbz = 0; 1438 break; 1439 default: 1440 m_freem(mm); 1441 return EINVAL; 1442 } 1443 1444 for (mifp = mif6table, iif = 0; 1445 iif < nummifs && mifp && 1446 mifp->m6_ifp != ifp; 1447 mifp++, iif++) 1448 ; 1449 1450 switch (ip6_mrouter_ver) { 1451 case MRT6_OINIT: 1452 oim->im6_mif = iif; 1453 sin6.sin6_addr = oim->im6_src; 1454 break; 1455 case MRT6_INIT: 1456 im->im6_mif = iif; 1457 sin6.sin6_addr = im->im6_src; 1458 break; 1459 } 1460 1461 mrt6stat.mrt6s_upcalls++; 1462 1463 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1464 #ifdef MRT6DEBUG 1465 if (mrt6debug) 1466 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1467 #endif 1468 ++mrt6stat.mrt6s_upq_sockfull; 1469 return ENOBUFS; 1470 } /* if socket Q full */ 1471 } /* if PIM */ 1472 return 0; 1473 } /* if wrong iif */ 1474 1475 /* If I sourced this packet, it counts as output, else it was input. */ 1476 if (m->m_pkthdr.rcvif == NULL) { 1477 /* XXX: is rcvif really NULL when output?? */ 1478 mif6table[mifi].m6_pkt_out++; 1479 mif6table[mifi].m6_bytes_out += plen; 1480 } else { 1481 mif6table[mifi].m6_pkt_in++; 1482 mif6table[mifi].m6_bytes_in += plen; 1483 } 1484 rt->mf6c_pkt_cnt++; 1485 rt->mf6c_byte_cnt += plen; 1486 1487 /* 1488 * For each mif, forward a copy of the packet if there are group 1489 * members downstream on the interface. 1490 */ 1491 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1492 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1493 if (mif6table[mifi].m6_ifp == NULL) 1494 continue; 1495 #ifdef notyet 1496 /* 1497 * check if the outgoing packet is going to break 1498 * a scope boundary. 1499 * XXX For packets through PIM register tunnel 1500 * interface, we believe a routing daemon. 1501 */ 1502 if ((mif6table[rt->mf6c_parent].m6_flags & 1503 MIFF_REGISTER) == 0 && 1504 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1505 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1506 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1507 &ip6->ip6_dst) || 1508 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1509 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1510 &ip6->ip6_src))) { 1511 ip6stat.ip6s_badscope++; 1512 continue; 1513 } 1514 #endif 1515 1516 mifp->m6_pkt_out++; 1517 mifp->m6_bytes_out += plen; 1518 MC6_SEND(ip6, mifp, m); 1519 } 1520 return 0; 1521 } 1522 1523 static void 1524 phyint_send(ip6, mifp, m) 1525 struct ip6_hdr *ip6; 1526 struct mif6 *mifp; 1527 struct mbuf *m; 1528 { 1529 struct mbuf *mb_copy; 1530 struct ifnet *ifp = mifp->m6_ifp; 1531 int error = 0; 1532 int s = splsoftnet(); 1533 static struct route_in6 ro; 1534 struct in6_multi *in6m; 1535 struct sockaddr_in6 *dst6; 1536 u_long linkmtu; 1537 1538 /* 1539 * Make a new reference to the packet; make sure that 1540 * the IPv6 header is actually copied, not just referenced, 1541 * so that ip6_output() only scribbles on the copy. 1542 */ 1543 mb_copy = m_copy(m, 0, M_COPYALL); 1544 if (mb_copy && 1545 (M_READONLY(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1546 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1547 if (mb_copy == NULL) { 1548 splx(s); 1549 return; 1550 } 1551 /* set MCAST flag to the outgoing packet */ 1552 mb_copy->m_flags |= M_MCAST; 1553 1554 /* 1555 * If we sourced the packet, call ip6_output since we may devide 1556 * the packet into fragments when the packet is too big for the 1557 * outgoing interface. 1558 * Otherwise, we can simply send the packet to the interface 1559 * sending queue. 1560 */ 1561 if (m->m_pkthdr.rcvif == NULL) { 1562 struct ip6_moptions im6o; 1563 1564 im6o.im6o_multicast_ifp = ifp; 1565 /* XXX: ip6_output will override ip6->ip6_hlim */ 1566 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1567 im6o.im6o_multicast_loop = 1; 1568 error = ip6_output(mb_copy, NULL, &ro, IPV6_FORWARDING, 1569 &im6o, (struct socket *)0, NULL); 1570 1571 #ifdef MRT6DEBUG 1572 if (mrt6debug & DEBUG_XMIT) 1573 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1574 mifp - mif6table, error); 1575 #endif 1576 splx(s); 1577 return; 1578 } 1579 1580 /* 1581 * If we belong to the destination multicast group 1582 * on the outgoing interface, loop back a copy. 1583 */ 1584 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1585 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1586 if (in6m != NULL) { 1587 dst6->sin6_len = sizeof(struct sockaddr_in6); 1588 dst6->sin6_family = AF_INET6; 1589 dst6->sin6_addr = ip6->ip6_dst; 1590 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1591 } 1592 /* 1593 * Put the packet into the sending queue of the outgoing interface 1594 * if it would fit in the MTU of the interface. 1595 */ 1596 linkmtu = IN6_LINKMTU(ifp); 1597 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1598 dst6->sin6_len = sizeof(struct sockaddr_in6); 1599 dst6->sin6_family = AF_INET6; 1600 dst6->sin6_addr = ip6->ip6_dst; 1601 /* 1602 * We just call if_output instead of nd6_output here, since 1603 * we need no ND for a multicast forwarded packet...right? 1604 */ 1605 error = (*ifp->if_output)(ifp, mb_copy, 1606 (struct sockaddr *)&ro.ro_dst, NULL); 1607 #ifdef MRT6DEBUG 1608 if (mrt6debug & DEBUG_XMIT) 1609 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1610 mifp - mif6table, error); 1611 #endif 1612 } else { 1613 #ifdef MULTICAST_PMTUD 1614 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1615 #else 1616 #ifdef MRT6DEBUG 1617 if (mrt6debug & DEBUG_XMIT) 1618 log(LOG_DEBUG, 1619 "phyint_send: packet too big on %s o %s g %s" 1620 " size %d(discarded)\n", 1621 if_name(ifp), 1622 ip6_sprintf(&ip6->ip6_src), 1623 ip6_sprintf(&ip6->ip6_dst), 1624 mb_copy->m_pkthdr.len); 1625 #endif /* MRT6DEBUG */ 1626 m_freem(mb_copy); /* simply discard the packet */ 1627 #endif 1628 } 1629 1630 splx(s); 1631 } 1632 1633 static int 1634 register_send(ip6, mif, m) 1635 struct ip6_hdr *ip6; 1636 struct mif6 *mif; 1637 struct mbuf *m; 1638 { 1639 struct mbuf *mm; 1640 int i, len = m->m_pkthdr.len; 1641 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1642 struct mrt6msg *im6; 1643 1644 #ifdef MRT6DEBUG 1645 if (mrt6debug) 1646 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1647 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1648 #endif 1649 ++pim6stat.pim6s_snd_registers; 1650 1651 /* Make a copy of the packet to send to the user level process */ 1652 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1653 if (mm == NULL) 1654 return ENOBUFS; 1655 mm->m_data += max_linkhdr; 1656 mm->m_len = sizeof(struct ip6_hdr); 1657 1658 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1659 m_freem(mm); 1660 return ENOBUFS; 1661 } 1662 i = MHLEN - M_LEADINGSPACE(mm); 1663 if (i > len) 1664 i = len; 1665 mm = m_pullup(mm, i); 1666 if (mm == NULL) 1667 return ENOBUFS; 1668 /* TODO: check it! */ 1669 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1670 1671 /* 1672 * Send message to routing daemon 1673 */ 1674 sin6.sin6_addr = ip6->ip6_src; 1675 1676 im6 = mtod(mm, struct mrt6msg *); 1677 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1678 im6->im6_mbz = 0; 1679 1680 im6->im6_mif = mif - mif6table; 1681 1682 /* iif info is not given for reg. encap.n */ 1683 mrt6stat.mrt6s_upcalls++; 1684 1685 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1686 #ifdef MRT6DEBUG 1687 if (mrt6debug) 1688 log(LOG_WARNING, 1689 "register_send: ip6_mrouter socket queue full\n"); 1690 #endif 1691 ++mrt6stat.mrt6s_upq_sockfull; 1692 return ENOBUFS; 1693 } 1694 return 0; 1695 } 1696 1697 /* 1698 * PIM sparse mode hook 1699 * Receives the pim control messages, and passes them up to the listening 1700 * socket, using rip6_input. 1701 * The only message processed is the REGISTER pim message; the pim header 1702 * is stripped off, and the inner packet is passed to register_mforward. 1703 */ 1704 int 1705 pim6_input(mp, offp, proto) 1706 struct mbuf **mp; 1707 int *offp, proto; 1708 { 1709 struct pim *pim; /* pointer to a pim struct */ 1710 struct ip6_hdr *ip6; 1711 int pimlen; 1712 struct mbuf *m = *mp; 1713 int minlen; 1714 int off = *offp; 1715 1716 ++pim6stat.pim6s_rcv_total; 1717 1718 ip6 = mtod(m, struct ip6_hdr *); 1719 pimlen = m->m_pkthdr.len - *offp; 1720 1721 /* 1722 * Validate lengths 1723 */ 1724 if (pimlen < PIM_MINLEN) { 1725 ++pim6stat.pim6s_rcv_tooshort; 1726 #ifdef MRT6DEBUG 1727 if (mrt6debug & DEBUG_PIM) 1728 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1729 #endif 1730 m_freem(m); 1731 return (IPPROTO_DONE); 1732 } 1733 1734 /* 1735 * if the packet is at least as big as a REGISTER, go ahead 1736 * and grab the PIM REGISTER header size, to avoid another 1737 * possible m_pullup() later. 1738 * 1739 * PIM_MINLEN == pimhdr + u_int32 == 8 1740 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1741 */ 1742 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1743 1744 /* 1745 * Make sure that the IP6 and PIM headers in contiguous memory, and 1746 * possibly the PIM REGISTER header 1747 */ 1748 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1749 if (pim == NULL) { 1750 pim6stat.pim6s_rcv_tooshort++; 1751 return IPPROTO_DONE; 1752 } 1753 1754 /* PIM version check */ 1755 if (pim->pim_ver != PIM_VERSION) { 1756 ++pim6stat.pim6s_rcv_badversion; 1757 #ifdef MRT6DEBUG 1758 log(LOG_ERR, 1759 "pim6_input: incorrect version %d, expecting %d\n", 1760 pim->pim_ver, PIM_VERSION); 1761 #endif 1762 m_freem(m); 1763 return (IPPROTO_DONE); 1764 } 1765 1766 #define PIM6_CHECKSUM 1767 #ifdef PIM6_CHECKSUM 1768 { 1769 int cksumlen; 1770 1771 /* 1772 * Validate checksum. 1773 * If PIM REGISTER, exclude the data packet 1774 */ 1775 if (pim->pim_type == PIM_REGISTER) 1776 cksumlen = PIM_MINLEN; 1777 else 1778 cksumlen = pimlen; 1779 1780 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1781 ++pim6stat.pim6s_rcv_badsum; 1782 #ifdef MRT6DEBUG 1783 if (mrt6debug & DEBUG_PIM) 1784 log(LOG_DEBUG, 1785 "pim6_input: invalid checksum\n"); 1786 #endif 1787 m_freem(m); 1788 return (IPPROTO_DONE); 1789 } 1790 } 1791 #endif /* PIM_CHECKSUM */ 1792 1793 if (pim->pim_type == PIM_REGISTER) { 1794 /* 1795 * since this is a REGISTER, we'll make a copy of the register 1796 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1797 * routing daemon. 1798 */ 1799 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1800 1801 struct mbuf *mcp; 1802 struct ip6_hdr *eip6; 1803 u_int32_t *reghdr; 1804 1805 ++pim6stat.pim6s_rcv_registers; 1806 1807 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1808 #ifdef MRT6DEBUG 1809 if (mrt6debug & DEBUG_PIM) 1810 log(LOG_DEBUG, 1811 "pim6_input: register mif not set: %d\n", 1812 reg_mif_num); 1813 #endif 1814 m_freem(m); 1815 return (IPPROTO_DONE); 1816 } 1817 1818 reghdr = (u_int32_t *)(pim + 1); 1819 1820 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1821 goto pim6_input_to_daemon; 1822 1823 /* 1824 * Validate length 1825 */ 1826 if (pimlen < PIM6_REG_MINLEN) { 1827 ++pim6stat.pim6s_rcv_tooshort; 1828 ++pim6stat.pim6s_rcv_badregisters; 1829 #ifdef MRT6DEBUG 1830 log(LOG_ERR, 1831 "pim6_input: register packet size too " 1832 "small %d from %s\n", 1833 pimlen, ip6_sprintf(&ip6->ip6_src)); 1834 #endif 1835 m_freem(m); 1836 return (IPPROTO_DONE); 1837 } 1838 1839 eip6 = (struct ip6_hdr *) (reghdr + 1); 1840 #ifdef MRT6DEBUG 1841 if (mrt6debug & DEBUG_PIM) 1842 log(LOG_DEBUG, 1843 "pim6_input[register], eip6: %s -> %s, " 1844 "eip6 plen %d\n", 1845 ip6_sprintf(&eip6->ip6_src), 1846 ip6_sprintf(&eip6->ip6_dst), 1847 ntohs(eip6->ip6_plen)); 1848 #endif 1849 1850 /* verify the version number of the inner packet */ 1851 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1852 ++pim6stat.pim6s_rcv_badregisters; 1853 #ifdef MRT6DEBUG 1854 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1855 "of the inner packet\n", 1856 (eip6->ip6_vfc & IPV6_VERSION)); 1857 #endif 1858 m_freem(m); 1859 return (IPPROTO_NONE); 1860 } 1861 1862 /* verify the inner packet is destined to a mcast group */ 1863 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1864 ++pim6stat.pim6s_rcv_badregisters; 1865 #ifdef MRT6DEBUG 1866 if (mrt6debug & DEBUG_PIM) 1867 log(LOG_DEBUG, 1868 "pim6_input: inner packet of register " 1869 "is not multicast %s\n", 1870 ip6_sprintf(&eip6->ip6_dst)); 1871 #endif 1872 m_freem(m); 1873 return (IPPROTO_DONE); 1874 } 1875 1876 /* 1877 * make a copy of the whole header to pass to the daemon later. 1878 */ 1879 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1880 if (mcp == NULL) { 1881 #ifdef MRT6DEBUG 1882 log(LOG_ERR, 1883 "pim6_input: pim register: " 1884 "could not copy register head\n"); 1885 #endif 1886 m_freem(m); 1887 return (IPPROTO_DONE); 1888 } 1889 1890 /* 1891 * forward the inner ip6 packet; point m_data at the inner ip6. 1892 */ 1893 m_adj(m, off + PIM_MINLEN); 1894 #ifdef MRT6DEBUG 1895 if (mrt6debug & DEBUG_PIM) { 1896 log(LOG_DEBUG, 1897 "pim6_input: forwarding decapsulated register: " 1898 "src %s, dst %s, mif %d\n", 1899 ip6_sprintf(&eip6->ip6_src), 1900 ip6_sprintf(&eip6->ip6_dst), 1901 reg_mif_num); 1902 } 1903 #endif 1904 1905 looutput(mif6table[reg_mif_num].m6_ifp, m, 1906 (struct sockaddr *) &dst, 1907 (struct rtentry *) NULL); 1908 1909 /* prepare the register head to send to the mrouting daemon */ 1910 m = mcp; 1911 } 1912 1913 /* 1914 * Pass the PIM message up to the daemon; if it is a register message 1915 * pass the 'head' only up to the daemon. This includes the 1916 * encapsulator ip6 header, pim header, register header and the 1917 * encapsulated ip6 header. 1918 */ 1919 pim6_input_to_daemon: 1920 rip6_input(&m, offp, proto); 1921 return (IPPROTO_DONE); 1922 } 1923
Indexes created Wed Sep 24 22:09:59 GMT 2025