1 /* $NetBSD: ip6_mroute.c,v 1.59 2003/12/10 09:28:38 itojun Exp $ */ 2 /* $KAME: ip6_mroute.c,v 1.45 2001/03/25 08:38:51 itojun 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) 1989 Stephen Deering 37 * Copyright (c) 1992, 1993 38 * The Regents of the University of California. All rights reserved. 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Stephen Deering of Stanford University. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 68 */ 69 70 /* 71 * IP multicast forwarding procedures 72 * 73 * Written by David Waitzman, BBN Labs, August 1988. 74 * Modified by Steve Deering, Stanford, February 1989. 75 * Modified by Mark J. Steiglitz, Stanford, May, 1991 76 * Modified by Van Jacobson, LBL, January 1993 77 * Modified by Ajit Thyagarajan, PARC, August 1993 78 * Modified by Bill Fenner, PARC, April 1994 79 * 80 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 81 */ 82 83 #include <sys/param.h> 84 #include <sys/systm.h> 85 #include <sys/timeout.h> 86 #include <sys/mbuf.h> 87 #include <sys/socket.h> 88 #include <sys/socketvar.h> 89 #include <sys/sockio.h> 90 #include <sys/protosw.h> 91 #include <sys/errno.h> 92 #include <sys/time.h> 93 #include <sys/kernel.h> 94 #include <sys/ioctl.h> 95 #include <sys/syslog.h> 96 #include <sys/proc.h> 97 #include <sys/sysctl.h> 98 99 #include <net/if.h> 100 #include <net/route.h> 101 #include <net/raw_cb.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_var.h> 105 #include <netinet/icmp6.h> 106 107 #include <netinet/ip6.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet6/ip6_mroute.h> 110 #include <netinet6/pim6.h> 111 #include <netinet6/pim6_var.h> 112 #include <netinet6/nd6.h> 113 114 int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 115 void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 116 117 int set_pim6(int *); 118 int get_pim6(struct mbuf *); 119 int socket_send(struct socket *, struct mbuf *, struct sockaddr_in6 *); 120 int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 121 122 /* 123 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 124 * except for netstat or debugging purposes. 125 */ 126 struct socket *ip6_mrouter = NULL; 127 int ip6_mrouter_ver = 0; 128 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 129 struct mrt6stat mrt6stat; 130 131 #define NO_RTE_FOUND 0x1 132 #define RTE_FOUND 0x2 133 134 struct mf6c *mf6ctable[MF6CTBLSIZ]; 135 u_char n6expire[MF6CTBLSIZ]; 136 struct mif6 mif6table[MAXMIFS]; 137 #ifdef MRT6DEBUG 138 u_int mrt6debug = 0; /* debug level */ 139 #define DEBUG_MFC 0x02 140 #define DEBUG_FORWARD 0x04 141 #define DEBUG_EXPIRE 0x08 142 #define DEBUG_XMIT 0x10 143 #define DEBUG_REG 0x20 144 #define DEBUG_PIM 0x40 145 #endif 146 147 void expire_upcalls(void *); 148 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 149 #define UPCALL_EXPIRE 6 /* number of timeouts */ 150 151 #ifdef INET 152 #ifdef MROUTING 153 extern struct socket *ip_mrouter; 154 #endif 155 #endif 156 157 /* 158 * 'Interfaces' associated with decapsulator (so we can tell 159 * packets that went through it from ones that get reflected 160 * by a broken gateway). These interfaces are never linked into 161 * the system ifnet list & no routes point to them. I.e., packets 162 * can't be sent this way. They only exist as a placeholder for 163 * multicast source verification. 164 */ 165 struct ifnet multicast_register_if; 166 167 #define ENCAP_HOPS 64 168 169 /* 170 * Private variables. 171 */ 172 static mifi_t nummifs = 0; 173 static mifi_t reg_mif_num = (mifi_t)-1; 174 175 struct pim6stat pim6stat; 176 static int pim6; 177 178 /* 179 * Hash function for a source, group entry 180 */ 181 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 182 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 183 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 184 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 185 186 /* 187 * Find a route for a given origin IPv6 address and Multicast group address. 188 * Quality of service parameter to be added in the future!!! 189 */ 190 191 #define MF6CFIND(o, g, rt) do { \ 192 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 193 rt = NULL; \ 194 mrt6stat.mrt6s_mfc_lookups++; \ 195 while (_rt) { \ 196 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 197 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 198 (_rt->mf6c_stall == NULL)) { \ 199 rt = _rt; \ 200 break; \ 201 } \ 202 _rt = _rt->mf6c_next; \ 203 } \ 204 if (rt == NULL) { \ 205 mrt6stat.mrt6s_mfc_misses++; \ 206 } \ 207 } while (0) 208 209 /* 210 * Macros to compute elapsed time efficiently 211 * Borrowed from Van Jacobson's scheduling code 212 */ 213 #define TV_DELTA(a, b, delta) do { \ 214 int xxs; \ 215 \ 216 delta = (a).tv_usec - (b).tv_usec; \ 217 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 218 switch (xxs) { \ 219 case 2: \ 220 delta += 1000000; \ 221 /* FALLTHROUGH */ \ 222 case 1: \ 223 delta += 1000000; \ 224 break; \ 225 default: \ 226 delta += (1000000 * xxs); \ 227 } \ 228 } \ 229 } while (0) 230 231 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 232 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 233 234 #ifdef UPCALL_TIMING 235 #define UPCALL_MAX 50 236 u_long upcall_data[UPCALL_MAX + 1]; 237 static void collate(); 238 #endif /* UPCALL_TIMING */ 239 240 int get_sg_cnt(struct sioc_sg_req6 *); 241 int get_mif6_cnt(struct sioc_mif_req6 *); 242 int ip6_mrouter_init(struct socket *, int, int); 243 int add_m6if(struct mif6ctl *); 244 int del_m6if(mifi_t *); 245 int add_m6fc(struct mf6cctl *); 246 int del_m6fc(struct mf6cctl *); 247 248 static struct timeout expire_upcalls_ch; 249 250 /* 251 * Handle MRT setsockopt commands to modify the multicast routing tables. 252 */ 253 int 254 ip6_mrouter_set(int cmd, struct socket *so, struct mbuf *m) 255 { 256 if (cmd != MRT6_INIT && so != ip6_mrouter) 257 return (EACCES); 258 259 switch (cmd) { 260 #ifdef MRT6_OINIT 261 case MRT6_OINIT: 262 #endif 263 case MRT6_INIT: 264 if (m == NULL || m->m_len < sizeof(int)) 265 return (EINVAL); 266 return (ip6_mrouter_init(so, *mtod(m, int *), cmd)); 267 case MRT6_DONE: 268 return (ip6_mrouter_done()); 269 case MRT6_ADD_MIF: 270 if (m == NULL || m->m_len < sizeof(struct mif6ctl)) 271 return (EINVAL); 272 return (add_m6if(mtod(m, struct mif6ctl *))); 273 case MRT6_DEL_MIF: 274 if (m == NULL || m->m_len < sizeof(mifi_t)) 275 return (EINVAL); 276 return (del_m6if(mtod(m, mifi_t *))); 277 case MRT6_ADD_MFC: 278 if (m == NULL || m->m_len < sizeof(struct mf6cctl)) 279 return (EINVAL); 280 return (add_m6fc(mtod(m, struct mf6cctl *))); 281 case MRT6_DEL_MFC: 282 if (m == NULL || m->m_len < sizeof(struct mf6cctl)) 283 return (EINVAL); 284 return (del_m6fc(mtod(m, struct mf6cctl *))); 285 case MRT6_PIM: 286 if (m == NULL || m->m_len < sizeof(int)) 287 return (EINVAL); 288 return (set_pim6(mtod(m, int *))); 289 default: 290 return (EOPNOTSUPP); 291 } 292 } 293 294 /* 295 * Handle MRT getsockopt commands 296 */ 297 int 298 ip6_mrouter_get(int cmd, struct socket *so, struct mbuf **m) 299 { 300 if (so != ip6_mrouter) return EACCES; 301 302 *m = m_get(M_WAIT, MT_SOOPTS); 303 304 switch (cmd) { 305 case MRT6_PIM: 306 return get_pim6(*m); 307 default: 308 return EOPNOTSUPP; 309 } 310 } 311 312 /* 313 * Handle ioctl commands to obtain information from the cache 314 */ 315 int 316 mrt6_ioctl(int cmd, caddr_t data) 317 { 318 319 switch (cmd) { 320 case SIOCGETSGCNT_IN6: 321 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 322 case SIOCGETMIFCNT_IN6: 323 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 324 default: 325 return (ENOTTY); 326 } 327 } 328 329 /* 330 * returns the packet, byte, rpf-failure count for the source group provided 331 */ 332 int 333 get_sg_cnt(struct sioc_sg_req6 *req) 334 { 335 struct mf6c *rt; 336 int s; 337 338 s = splsoftnet(); 339 340 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 341 splx(s); 342 if (rt != NULL) { 343 req->pktcnt = rt->mf6c_pkt_cnt; 344 req->bytecnt = rt->mf6c_byte_cnt; 345 req->wrong_if = rt->mf6c_wrong_if; 346 } else 347 return (ESRCH); 348 #if 0 349 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 350 #endif 351 352 return 0; 353 } 354 355 /* 356 * returns the input and output packet and byte counts on the mif provided 357 */ 358 int 359 get_mif6_cnt(struct sioc_mif_req6 *req) 360 { 361 mifi_t mifi = req->mifi; 362 363 if (mifi >= nummifs) 364 return EINVAL; 365 366 req->icount = mif6table[mifi].m6_pkt_in; 367 req->ocount = mif6table[mifi].m6_pkt_out; 368 req->ibytes = mif6table[mifi].m6_bytes_in; 369 req->obytes = mif6table[mifi].m6_bytes_out; 370 371 return 0; 372 } 373 374 /* 375 * Get PIM processiong global 376 */ 377 int 378 get_pim6(struct mbuf *m) 379 { 380 int *i; 381 382 i = mtod(m, int *); 383 384 *i = pim6; 385 386 return 0; 387 } 388 389 int 390 set_pim6(int *i) 391 { 392 if ((*i != 1) && (*i != 0)) 393 return EINVAL; 394 395 pim6 = *i; 396 397 return 0; 398 } 399 400 /* 401 * Enable multicast routing 402 */ 403 int 404 ip6_mrouter_init(struct socket *so, int v, int cmd) 405 { 406 #ifdef MRT6DEBUG 407 if (mrt6debug) 408 log(LOG_DEBUG, 409 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 410 so->so_type, so->so_proto->pr_protocol); 411 #endif 412 413 if (so->so_type != SOCK_RAW || 414 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 415 return (EOPNOTSUPP); 416 417 if (v != 1) 418 return (ENOPROTOOPT); 419 420 if (ip6_mrouter != NULL) 421 return (EADDRINUSE); 422 423 ip6_mrouter = so; 424 ip6_mrouter_ver = cmd; 425 426 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 427 bzero((caddr_t)n6expire, sizeof(n6expire)); 428 429 pim6 = 0;/* used for stubbing out/in pim stuff */ 430 431 timeout_set(&expire_upcalls_ch, expire_upcalls, NULL); 432 timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT); 433 434 #ifdef MRT6DEBUG 435 if (mrt6debug) 436 log(LOG_DEBUG, "ip6_mrouter_init\n"); 437 #endif 438 439 return 0; 440 } 441 442 /* 443 * Disable multicast routing 444 */ 445 int 446 ip6_mrouter_done(void) 447 { 448 mifi_t mifi; 449 int i; 450 struct ifnet *ifp; 451 struct in6_ifreq ifr; 452 struct mf6c *rt; 453 struct rtdetq *rte; 454 int s; 455 456 s = splsoftnet(); 457 458 /* 459 * For each phyint in use, disable promiscuous reception of all IPv6 460 * multicasts. 461 */ 462 #ifdef INET 463 #ifdef MROUTING 464 /* 465 * If there is still IPv4 multicast routing daemon, 466 * we remain interfaces to receive all muliticasted packets. 467 * XXX: there may be an interface in which the IPv4 multicast 468 * daemon is not interested... 469 */ 470 if (!ip_mrouter) 471 #endif 472 #endif 473 { 474 for (mifi = 0; mifi < nummifs; mifi++) { 475 if (mif6table[mifi].m6_ifp && 476 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 477 ifr.ifr_addr.sin6_family = AF_INET6; 478 ifr.ifr_addr.sin6_addr= in6addr_any; 479 ifp = mif6table[mifi].m6_ifp; 480 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 481 (caddr_t)&ifr); 482 } 483 } 484 } 485 #ifdef notyet 486 bzero((caddr_t)qtable, sizeof(qtable)); 487 bzero((caddr_t)tbftable, sizeof(tbftable)); 488 #endif 489 bzero((caddr_t)mif6table, sizeof(mif6table)); 490 nummifs = 0; 491 492 pim6 = 0; /* used to stub out/in pim specific code */ 493 494 timeout_del(&expire_upcalls_ch); 495 496 /* 497 * Free all multicast forwarding cache entries. 498 */ 499 for (i = 0; i < MF6CTBLSIZ; i++) { 500 rt = mf6ctable[i]; 501 while (rt) { 502 struct mf6c *frt; 503 504 for (rte = rt->mf6c_stall; rte != NULL; ) { 505 struct rtdetq *n = rte->next; 506 507 m_free(rte->m); 508 free(rte, M_MRTABLE); 509 rte = n; 510 } 511 frt = rt; 512 rt = rt->mf6c_next; 513 free(frt, M_MRTABLE); 514 } 515 } 516 517 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 518 519 /* 520 * Reset de-encapsulation cache 521 */ 522 reg_mif_num = -1; 523 524 ip6_mrouter = NULL; 525 ip6_mrouter_ver = 0; 526 527 splx(s); 528 529 #ifdef MRT6DEBUG 530 if (mrt6debug) 531 log(LOG_DEBUG, "ip6_mrouter_done\n"); 532 #endif 533 534 return 0; 535 } 536 537 void 538 ip6_mrouter_detach(struct ifnet *ifp) 539 { 540 struct rtdetq *rte; 541 struct mf6c *mfc; 542 mifi_t mifi; 543 int i; 544 545 /* 546 * Delete a mif which points to ifp. 547 */ 548 for (mifi = 0; mifi < nummifs; mifi++) 549 if (mif6table[mifi].m6_ifp == ifp) 550 del_m6if(&mifi); 551 552 /* 553 * Clear rte->ifp of cache entries received on ifp. 554 */ 555 for (i = 0; i < MF6CTBLSIZ; i++) { 556 if (n6expire[i] == 0) 557 continue; 558 559 for (mfc = mf6ctable[i]; mfc != NULL; mfc = mfc->mf6c_next) { 560 for (rte = mfc->mf6c_stall; rte != NULL; rte = rte->next) { 561 if (rte->ifp == ifp) 562 rte->ifp = NULL; 563 } 564 } 565 } 566 } 567 568 /* 569 * Add a mif to the mif table 570 */ 571 int 572 add_m6if(struct mif6ctl *mifcp) 573 { 574 struct mif6 *mifp; 575 struct ifnet *ifp; 576 struct in6_ifreq ifr; 577 int error, s; 578 #ifdef notyet 579 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 580 #endif 581 582 if (mifcp->mif6c_mifi >= MAXMIFS) 583 return EINVAL; 584 mifp = mif6table + mifcp->mif6c_mifi; 585 if (mifp->m6_ifp) 586 return EADDRINUSE; /* XXX: is it appropriate? */ 587 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi >= if_indexlim) 588 return ENXIO; 589 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 590 if (!ifp) 591 return ENXIO; 592 593 if (mifcp->mif6c_flags & MIFF_REGISTER) { 594 if (reg_mif_num == (mifi_t)-1) { 595 strlcpy(multicast_register_if.if_xname, 596 "register_mif", 597 sizeof multicast_register_if.if_xname); /* XXX */ 598 multicast_register_if.if_flags |= IFF_LOOPBACK; 599 multicast_register_if.if_index = mifcp->mif6c_mifi; 600 reg_mif_num = mifcp->mif6c_mifi; 601 } 602 603 ifp = &multicast_register_if; 604 605 } /* if REGISTER */ 606 else { 607 /* Make sure the interface supports multicast */ 608 if ((ifp->if_flags & IFF_MULTICAST) == 0) 609 return EOPNOTSUPP; 610 611 s = splsoftnet(); 612 613 /* 614 * Enable promiscuous reception of all IPv6 multicasts 615 * from the interface. 616 */ 617 ifr.ifr_addr.sin6_family = AF_INET6; 618 ifr.ifr_addr.sin6_addr = in6addr_any; 619 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 620 621 splx(s); 622 if (error) 623 return error; 624 } 625 626 s = splsoftnet(); 627 628 mifp->m6_flags = mifcp->mif6c_flags; 629 mifp->m6_ifp = ifp; 630 #ifdef notyet 631 /* scaling up here allows division by 1024 in critical code */ 632 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 633 #endif 634 /* initialize per mif pkt counters */ 635 mifp->m6_pkt_in = 0; 636 mifp->m6_pkt_out = 0; 637 mifp->m6_bytes_in = 0; 638 mifp->m6_bytes_out = 0; 639 splx(s); 640 641 /* Adjust nummifs up if the mifi is higher than nummifs */ 642 if (nummifs <= mifcp->mif6c_mifi) 643 nummifs = mifcp->mif6c_mifi + 1; 644 645 #ifdef MRT6DEBUG 646 if (mrt6debug) 647 log(LOG_DEBUG, 648 "add_mif #%d, phyint %s%d\n", 649 mifcp->mif6c_mifi, 650 ifp->if_name, ifp->if_unit); 651 #endif 652 653 return 0; 654 } 655 656 /* 657 * Delete a mif from the mif table 658 */ 659 int 660 del_m6if(mifi_t *mifip) 661 { 662 struct mif6 *mifp = mif6table + *mifip; 663 mifi_t mifi; 664 struct ifnet *ifp; 665 struct in6_ifreq ifr; 666 int s; 667 668 if (*mifip >= nummifs) 669 return EINVAL; 670 if (mifp->m6_ifp == NULL) 671 return EINVAL; 672 673 s = splsoftnet(); 674 675 if (!(mifp->m6_flags & MIFF_REGISTER)) { 676 /* 677 * XXX: what if there is yet IPv4 multicast daemon 678 * using the interface? 679 */ 680 ifp = mifp->m6_ifp; 681 682 ifr.ifr_addr.sin6_family = AF_INET6; 683 ifr.ifr_addr.sin6_addr = in6addr_any; 684 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 685 } 686 687 #ifdef notyet 688 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 689 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 690 #endif 691 bzero((caddr_t)mifp, sizeof (*mifp)); 692 693 /* Adjust nummifs down */ 694 for (mifi = nummifs; mifi > 0; mifi--) 695 if (mif6table[mifi - 1].m6_ifp) 696 break; 697 nummifs = mifi; 698 699 splx(s); 700 701 #ifdef MRT6DEBUG 702 if (mrt6debug) 703 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 704 #endif 705 706 return 0; 707 } 708 709 /* 710 * Add an mfc entry 711 */ 712 int 713 add_m6fc(struct mf6cctl *mfccp) 714 { 715 struct mf6c *rt; 716 u_long hash; 717 struct rtdetq *rte; 718 u_short nstl; 719 int s; 720 721 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 722 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 723 724 /* If an entry already exists, just update the fields */ 725 if (rt) { 726 #ifdef MRT6DEBUG 727 if (mrt6debug & DEBUG_MFC) 728 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 729 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 730 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 731 mfccp->mf6cc_parent); 732 #endif 733 734 s = splsoftnet(); 735 736 rt->mf6c_parent = mfccp->mf6cc_parent; 737 rt->mf6c_ifset = mfccp->mf6cc_ifset; 738 splx(s); 739 return 0; 740 } 741 742 /* 743 * Find the entry for which the upcall was made and update 744 */ 745 s = splsoftnet(); 746 747 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 748 mfccp->mf6cc_mcastgrp.sin6_addr); 749 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 750 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 751 &mfccp->mf6cc_origin.sin6_addr) && 752 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 753 &mfccp->mf6cc_mcastgrp.sin6_addr) && 754 (rt->mf6c_stall != NULL)) { 755 756 if (nstl++) 757 log(LOG_ERR, 758 "add_m6fc: %s o %s g %s p %x dbx %p\n", 759 "multiple kernel entries", 760 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 761 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 762 mfccp->mf6cc_parent, rt->mf6c_stall); 763 764 #ifdef MRT6DEBUG 765 if (mrt6debug & DEBUG_MFC) 766 log(LOG_DEBUG, 767 "add_m6fc o %s g %s p %x dbg %x\n", 768 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 769 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 770 mfccp->mf6cc_parent, rt->mf6c_stall); 771 #endif 772 773 rt->mf6c_origin = mfccp->mf6cc_origin; 774 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 775 rt->mf6c_parent = mfccp->mf6cc_parent; 776 rt->mf6c_ifset = mfccp->mf6cc_ifset; 777 /* initialize pkt counters per src-grp */ 778 rt->mf6c_pkt_cnt = 0; 779 rt->mf6c_byte_cnt = 0; 780 rt->mf6c_wrong_if = 0; 781 782 rt->mf6c_expire = 0; /* Don't clean this guy up */ 783 n6expire[hash]--; 784 785 /* free packets Qed at the end of this entry */ 786 for (rte = rt->mf6c_stall; rte != NULL; ) { 787 struct rtdetq *n = rte->next; 788 if (rte->ifp) { 789 ip6_mdq(rte->m, rte->ifp, rt); 790 } 791 m_freem(rte->m); 792 #ifdef UPCALL_TIMING 793 collate(&(rte->t)); 794 #endif /* UPCALL_TIMING */ 795 free(rte, M_MRTABLE); 796 rte = n; 797 } 798 rt->mf6c_stall = NULL; 799 } 800 } 801 802 /* 803 * It is possible that an entry is being inserted without an upcall 804 */ 805 if (nstl == 0) { 806 #ifdef MRT6DEBUG 807 if (mrt6debug & DEBUG_MFC) 808 log(LOG_DEBUG, 809 "add_m6fc no upcall h %d o %s g %s p %x\n", 810 hash, 811 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 812 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 813 mfccp->mf6cc_parent); 814 #endif 815 816 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 817 818 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 819 &mfccp->mf6cc_origin.sin6_addr)&& 820 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 821 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 822 823 rt->mf6c_origin = mfccp->mf6cc_origin; 824 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 825 rt->mf6c_parent = mfccp->mf6cc_parent; 826 rt->mf6c_ifset = mfccp->mf6cc_ifset; 827 /* initialize pkt counters per src-grp */ 828 rt->mf6c_pkt_cnt = 0; 829 rt->mf6c_byte_cnt = 0; 830 rt->mf6c_wrong_if = 0; 831 832 if (rt->mf6c_expire) 833 n6expire[hash]--; 834 rt->mf6c_expire = 0; 835 } 836 } 837 if (rt == NULL) { 838 /* no upcall, so make a new entry */ 839 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 840 M_NOWAIT); 841 if (rt == NULL) { 842 splx(s); 843 return ENOBUFS; 844 } 845 846 /* insert new entry at head of hash chain */ 847 rt->mf6c_origin = mfccp->mf6cc_origin; 848 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 849 rt->mf6c_parent = mfccp->mf6cc_parent; 850 rt->mf6c_ifset = mfccp->mf6cc_ifset; 851 /* initialize pkt counters per src-grp */ 852 rt->mf6c_pkt_cnt = 0; 853 rt->mf6c_byte_cnt = 0; 854 rt->mf6c_wrong_if = 0; 855 rt->mf6c_expire = 0; 856 rt->mf6c_stall = NULL; 857 858 /* link into table */ 859 rt->mf6c_next = mf6ctable[hash]; 860 mf6ctable[hash] = rt; 861 } 862 } 863 splx(s); 864 return 0; 865 } 866 867 #ifdef UPCALL_TIMING 868 /* 869 * collect delay statistics on the upcalls 870 */ 871 static void 872 collate(struct timeval *t) 873 { 874 u_long d; 875 struct timeval tp; 876 u_long delta; 877 878 GET_TIME(tp); 879 880 if (TV_LT(*t, tp)) 881 { 882 TV_DELTA(tp, *t, delta); 883 884 d = delta >> 10; 885 if (d > UPCALL_MAX) 886 d = UPCALL_MAX; 887 888 ++upcall_data[d]; 889 } 890 } 891 #endif /* UPCALL_TIMING */ 892 893 /* 894 * Delete an mfc entry 895 */ 896 int 897 del_m6fc(struct mf6cctl *mfccp) 898 { 899 struct sockaddr_in6 origin; 900 struct sockaddr_in6 mcastgrp; 901 struct mf6c *rt; 902 struct mf6c **nptr; 903 u_long hash; 904 int s; 905 906 origin = mfccp->mf6cc_origin; 907 mcastgrp = mfccp->mf6cc_mcastgrp; 908 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 909 910 #ifdef MRT6DEBUG 911 if (mrt6debug & DEBUG_MFC) 912 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 913 ip6_sprintf(&origin.sin6_addr), 914 ip6_sprintf(&mcastgrp.sin6_addr)); 915 #endif 916 917 s = splsoftnet(); 918 919 nptr = &mf6ctable[hash]; 920 while ((rt = *nptr) != NULL) { 921 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 922 &rt->mf6c_origin.sin6_addr) && 923 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 924 &rt->mf6c_mcastgrp.sin6_addr) && 925 rt->mf6c_stall == NULL) 926 break; 927 928 nptr = &rt->mf6c_next; 929 } 930 if (rt == NULL) { 931 splx(s); 932 return EADDRNOTAVAIL; 933 } 934 935 *nptr = rt->mf6c_next; 936 free(rt, M_MRTABLE); 937 938 splx(s); 939 940 return 0; 941 } 942 943 int 944 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 945 { 946 if (s) { 947 if (sbappendaddr(&s->so_rcv, 948 (struct sockaddr *)src, 949 mm, (struct mbuf *)0) != 0) { 950 sorwakeup(s); 951 return 0; 952 } 953 } 954 m_freem(mm); 955 return -1; 956 } 957 958 /* 959 * IPv6 multicast forwarding function. This function assumes that the packet 960 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 961 * pointed to by "ifp", and the packet is to be relayed to other networks 962 * that have members of the packet's destination IPv6 multicast group. 963 * 964 * The packet is returned unscathed to the caller, unless it is 965 * erroneous, in which case a non-zero return value tells the caller to 966 * discard it. 967 */ 968 969 int 970 ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 971 { 972 struct mf6c *rt; 973 struct mif6 *mifp; 974 struct mbuf *mm; 975 int s; 976 mifi_t mifi; 977 struct sockaddr_in6 sin6; 978 979 #ifdef MRT6DEBUG 980 if (mrt6debug & DEBUG_FORWARD) 981 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 982 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 983 ifp->if_index); 984 #endif 985 986 /* 987 * Don't forward a packet with Hop limit of zero or one, 988 * or a packet destined to a local-only group. 989 */ 990 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 991 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 992 return 0; 993 ip6->ip6_hlim--; 994 995 /* 996 * Source address check: do not forward packets with unspecified 997 * source. It was discussed in July 2000, on ipngwg mailing list. 998 * This is rather more serious than unicast cases, because some 999 * MLD packets can be sent with the unspecified source address 1000 * (although such packets must normally set 1 to the hop limit field). 1001 */ 1002 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1003 ip6stat.ip6s_cantforward++; 1004 if (ip6_log_time + ip6_log_interval < time_second) { 1005 ip6_log_time = time_second; 1006 log(LOG_DEBUG, 1007 "cannot forward " 1008 "from %s to %s nxt %d received on %s\n", 1009 ip6_sprintf(&ip6->ip6_src), 1010 ip6_sprintf(&ip6->ip6_dst), 1011 ip6->ip6_nxt, 1012 m->m_pkthdr.rcvif->if_xname); 1013 } 1014 return 0; 1015 } 1016 1017 /* 1018 * Determine forwarding mifs from the forwarding cache table 1019 */ 1020 s = splsoftnet(); 1021 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1022 1023 /* Entry exists, so forward if necessary */ 1024 if (rt) { 1025 splx(s); 1026 return (ip6_mdq(m, ifp, rt)); 1027 } else { 1028 /* 1029 * If we don't have a route for packet's origin, 1030 * Make a copy of the packet & 1031 * send message to routing daemon 1032 */ 1033 1034 struct mbuf *mb0; 1035 struct rtdetq *rte; 1036 u_long hash; 1037 /* int i, npkts;*/ 1038 #ifdef UPCALL_TIMING 1039 struct timeval tp; 1040 1041 GET_TIME(tp); 1042 #endif /* UPCALL_TIMING */ 1043 1044 mrt6stat.mrt6s_no_route++; 1045 #ifdef MRT6DEBUG 1046 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1047 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1048 ip6_sprintf(&ip6->ip6_src), 1049 ip6_sprintf(&ip6->ip6_dst)); 1050 #endif 1051 1052 /* 1053 * Allocate mbufs early so that we don't do extra work if we 1054 * are just going to fail anyway. 1055 */ 1056 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1057 M_NOWAIT); 1058 if (rte == NULL) { 1059 splx(s); 1060 return ENOBUFS; 1061 } 1062 mb0 = m_copy(m, 0, M_COPYALL); 1063 /* 1064 * Pullup packet header if needed before storing it, 1065 * as other references may modify it in the meantime. 1066 */ 1067 if (mb0 && 1068 (M_READONLY(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1069 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1070 if (mb0 == NULL) { 1071 free(rte, M_MRTABLE); 1072 splx(s); 1073 return ENOBUFS; 1074 } 1075 1076 /* is there an upcall waiting for this packet? */ 1077 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1078 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1079 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1080 &rt->mf6c_origin.sin6_addr) && 1081 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1082 &rt->mf6c_mcastgrp.sin6_addr) && 1083 (rt->mf6c_stall != NULL)) 1084 break; 1085 } 1086 1087 if (rt == NULL) { 1088 struct mrt6msg *im; 1089 #ifdef MRT6_OINIT 1090 struct omrt6msg *oim; 1091 #endif 1092 1093 /* no upcall, so make a new entry */ 1094 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1095 M_NOWAIT); 1096 if (rt == NULL) { 1097 free(rte, M_MRTABLE); 1098 m_freem(mb0); 1099 splx(s); 1100 return ENOBUFS; 1101 } 1102 /* 1103 * Make a copy of the header to send to the user 1104 * level process 1105 */ 1106 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1107 1108 if (mm == NULL) { 1109 free(rte, M_MRTABLE); 1110 m_freem(mb0); 1111 free(rt, M_MRTABLE); 1112 splx(s); 1113 return ENOBUFS; 1114 } 1115 1116 /* 1117 * Send message to routing daemon 1118 */ 1119 (void)memset(&sin6, 0, sizeof(sin6)); 1120 sin6.sin6_len = sizeof(sin6); 1121 sin6.sin6_family = AF_INET6; 1122 sin6.sin6_addr = ip6->ip6_src; 1123 1124 im = NULL; 1125 #ifdef MRT6_OINIT 1126 oim = NULL; 1127 #endif 1128 switch (ip6_mrouter_ver) { 1129 #ifdef MRT6_OINIT 1130 case MRT6_OINIT: 1131 oim = mtod(mm, struct omrt6msg *); 1132 oim->im6_msgtype = MRT6MSG_NOCACHE; 1133 oim->im6_mbz = 0; 1134 break; 1135 #endif 1136 case MRT6_INIT: 1137 im = mtod(mm, struct mrt6msg *); 1138 im->im6_msgtype = MRT6MSG_NOCACHE; 1139 im->im6_mbz = 0; 1140 break; 1141 default: 1142 free(rte, M_MRTABLE); 1143 m_freem(mb0); 1144 free(rt, M_MRTABLE); 1145 splx(s); 1146 return EINVAL; 1147 } 1148 1149 #ifdef MRT6DEBUG 1150 if (mrt6debug & DEBUG_FORWARD) 1151 log(LOG_DEBUG, 1152 "getting the iif info in the kernel\n"); 1153 #endif 1154 1155 for (mifp = mif6table, mifi = 0; 1156 mifi < nummifs && mifp->m6_ifp != ifp; 1157 mifp++, mifi++) 1158 ; 1159 1160 switch (ip6_mrouter_ver) { 1161 #ifdef MRT6_OINIT 1162 case MRT6_OINIT: 1163 oim->im6_mif = mifi; 1164 break; 1165 #endif 1166 case MRT6_INIT: 1167 im->im6_mif = mifi; 1168 break; 1169 } 1170 1171 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1172 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1173 "socket queue full\n"); 1174 mrt6stat.mrt6s_upq_sockfull++; 1175 free(rte, M_MRTABLE); 1176 m_freem(mb0); 1177 free(rt, M_MRTABLE); 1178 splx(s); 1179 return ENOBUFS; 1180 } 1181 1182 mrt6stat.mrt6s_upcalls++; 1183 1184 /* insert new entry at head of hash chain */ 1185 bzero(rt, sizeof(*rt)); 1186 rt->mf6c_origin.sin6_family = AF_INET6; 1187 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1188 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1189 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1190 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1191 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1192 rt->mf6c_expire = UPCALL_EXPIRE; 1193 n6expire[hash]++; 1194 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1195 1196 /* link into table */ 1197 rt->mf6c_next = mf6ctable[hash]; 1198 mf6ctable[hash] = rt; 1199 /* Add this entry to the end of the queue */ 1200 rt->mf6c_stall = rte; 1201 } else { 1202 /* determine if q has overflowed */ 1203 struct rtdetq **p; 1204 int npkts = 0; 1205 1206 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1207 if (++npkts > MAX_UPQ6) { 1208 mrt6stat.mrt6s_upq_ovflw++; 1209 free(rte, M_MRTABLE); 1210 m_freem(mb0); 1211 splx(s); 1212 return 0; 1213 } 1214 1215 /* Add this entry to the end of the queue */ 1216 *p = rte; 1217 } 1218 1219 rte->next = NULL; 1220 rte->m = mb0; 1221 rte->ifp = ifp; 1222 #ifdef UPCALL_TIMING 1223 rte->t = tp; 1224 #endif /* UPCALL_TIMING */ 1225 1226 splx(s); 1227 1228 return 0; 1229 } 1230 } 1231 1232 /* 1233 * Clean up cache entries if upcalls are not serviced 1234 * Call from the Slow Timeout mechanism, every half second. 1235 */ 1236 void 1237 expire_upcalls(void *unused) 1238 { 1239 struct rtdetq *rte; 1240 struct mf6c *mfc, **nptr; 1241 int i; 1242 int s; 1243 1244 s = splsoftnet(); 1245 1246 for (i = 0; i < MF6CTBLSIZ; i++) { 1247 if (n6expire[i] == 0) 1248 continue; 1249 nptr = &mf6ctable[i]; 1250 while ((mfc = *nptr) != NULL) { 1251 rte = mfc->mf6c_stall; 1252 /* 1253 * Skip real cache entries 1254 * Make sure it wasn't marked to not expire (shouldn't happen) 1255 * If it expires now 1256 */ 1257 if (rte != NULL && 1258 mfc->mf6c_expire != 0 && 1259 --mfc->mf6c_expire == 0) { 1260 #ifdef MRT6DEBUG 1261 if (mrt6debug & DEBUG_EXPIRE) 1262 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1263 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1264 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1265 #endif 1266 /* 1267 * drop all the packets 1268 * free the mbuf with the pkt, if, timing info 1269 */ 1270 do { 1271 struct rtdetq *n = rte->next; 1272 m_freem(rte->m); 1273 free(rte, M_MRTABLE); 1274 rte = n; 1275 } while (rte != NULL); 1276 mrt6stat.mrt6s_cache_cleanups++; 1277 n6expire[i]--; 1278 1279 *nptr = mfc->mf6c_next; 1280 free(mfc, M_MRTABLE); 1281 } else { 1282 nptr = &mfc->mf6c_next; 1283 } 1284 } 1285 } 1286 splx(s); 1287 timeout_set(&expire_upcalls_ch, expire_upcalls, NULL); 1288 timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT); 1289 } 1290 1291 /* 1292 * Packet forwarding routine once entry in the cache is made 1293 */ 1294 int 1295 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1296 { 1297 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1298 mifi_t mifi, iif; 1299 struct mif6 *mifp; 1300 int plen = m->m_pkthdr.len; 1301 1302 /* 1303 * Macro to send packet on mif. Since RSVP packets don't get counted on 1304 * input, they shouldn't get counted on output, so statistics keeping is 1305 * separate. 1306 */ 1307 1308 #define MC6_SEND(ip6, mifp, m) do { \ 1309 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1310 register_send((ip6), (mifp), (m)); \ 1311 else \ 1312 phyint_send((ip6), (mifp), (m)); \ 1313 } while (0) 1314 1315 /* 1316 * Don't forward if it didn't arrive from the parent mif 1317 * for its origin. 1318 */ 1319 mifi = rt->mf6c_parent; 1320 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1321 /* came in the wrong interface */ 1322 #ifdef MRT6DEBUG 1323 if (mrt6debug & DEBUG_FORWARD) 1324 log(LOG_DEBUG, 1325 "wrong if: ifid %d mifi %d mififid %x\n", 1326 ifp->if_index, mifi, 1327 mif6table[mifi].m6_ifp ? 1328 mif6table[mifi].m6_ifp->if_index : -1); 1329 #endif 1330 mrt6stat.mrt6s_wrong_if++; 1331 rt->mf6c_wrong_if++; 1332 /* 1333 * If we are doing PIM processing, and we are forwarding 1334 * packets on this interface, send a message to the 1335 * routing daemon. 1336 */ 1337 /* have to make sure this is a valid mif */ 1338 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1339 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1340 /* 1341 * Check the M_LOOP flag to avoid an 1342 * unnecessary PIM assert. 1343 * XXX: M_LOOP is an ad-hoc hack... 1344 */ 1345 struct sockaddr_in6 sin6; 1346 1347 struct mbuf *mm; 1348 struct mrt6msg *im; 1349 #ifdef MRT6_OINIT 1350 struct omrt6msg *oim; 1351 #endif 1352 1353 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1354 if (mm && 1355 (M_READONLY(mm) || 1356 mm->m_len < sizeof(struct ip6_hdr))) 1357 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1358 if (mm == NULL) 1359 return ENOBUFS; 1360 1361 #ifdef MRT6_OINIT 1362 oim = NULL; 1363 #endif 1364 im = NULL; 1365 switch (ip6_mrouter_ver) { 1366 #ifdef MRT6_OINIT 1367 case MRT6_OINIT: 1368 oim = mtod(mm, struct omrt6msg *); 1369 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1370 oim->im6_mbz = 0; 1371 break; 1372 #endif 1373 case MRT6_INIT: 1374 im = mtod(mm, struct mrt6msg *); 1375 im->im6_msgtype = MRT6MSG_WRONGMIF; 1376 im->im6_mbz = 0; 1377 break; 1378 default: 1379 m_freem(mm); 1380 return EINVAL; 1381 } 1382 1383 for (mifp = mif6table, iif = 0; 1384 iif < nummifs && mifp && 1385 mifp->m6_ifp != ifp; 1386 mifp++, iif++) 1387 ; 1388 1389 (void)memset(&sin6, 0, sizeof(sin6)); 1390 sin6.sin6_len = sizeof(sin6); 1391 sin6.sin6_family = AF_INET6; 1392 switch (ip6_mrouter_ver) { 1393 #ifdef MRT6_OINIT 1394 case MRT6_OINIT: 1395 oim->im6_mif = iif; 1396 sin6.sin6_addr = oim->im6_src; 1397 break; 1398 #endif 1399 case MRT6_INIT: 1400 im->im6_mif = iif; 1401 sin6.sin6_addr = im->im6_src; 1402 break; 1403 } 1404 1405 mrt6stat.mrt6s_upcalls++; 1406 1407 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1408 #ifdef MRT6DEBUG 1409 if (mrt6debug) 1410 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1411 #endif 1412 ++mrt6stat.mrt6s_upq_sockfull; 1413 return ENOBUFS; 1414 } /* if socket Q full */ 1415 } /* if PIM */ 1416 return 0; 1417 } /* if wrong iif */ 1418 1419 /* If I sourced this packet, it counts as output, else it was input. */ 1420 if (m->m_pkthdr.rcvif == NULL) { 1421 /* XXX: is rcvif really NULL when output?? */ 1422 mif6table[mifi].m6_pkt_out++; 1423 mif6table[mifi].m6_bytes_out += plen; 1424 } else { 1425 mif6table[mifi].m6_pkt_in++; 1426 mif6table[mifi].m6_bytes_in += plen; 1427 } 1428 rt->mf6c_pkt_cnt++; 1429 rt->mf6c_byte_cnt += plen; 1430 1431 /* 1432 * For each mif, forward a copy of the packet if there are group 1433 * members downstream on the interface. 1434 */ 1435 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1436 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1437 if (mif6table[mifi].m6_ifp == NULL) 1438 continue; 1439 1440 /* 1441 * check if the outgoing packet is going to break 1442 * a scope boundary. 1443 * XXX For packets through PIM register tunnel 1444 * interface, we believe a routing daemon. 1445 */ 1446 if ((mif6table[rt->mf6c_parent].m6_flags & 1447 MIFF_REGISTER) == 0 && 1448 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1449 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1450 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1451 &ip6->ip6_dst) || 1452 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1453 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1454 &ip6->ip6_src))) { 1455 ip6stat.ip6s_badscope++; 1456 continue; 1457 } 1458 1459 mifp->m6_pkt_out++; 1460 mifp->m6_bytes_out += plen; 1461 MC6_SEND(ip6, mifp, m); 1462 } 1463 return 0; 1464 } 1465 1466 void 1467 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1468 { 1469 struct mbuf *mb_copy; 1470 struct ifnet *ifp = mifp->m6_ifp; 1471 int error = 0; 1472 int s = splsoftnet(); 1473 static struct route_in6 ro; 1474 struct in6_multi *in6m; 1475 struct sockaddr_in6 *dst6; 1476 u_long linkmtu; 1477 1478 /* 1479 * Make a new reference to the packet; make sure that 1480 * the IPv6 header is actually copied, not just referenced, 1481 * so that ip6_output() only scribbles on the copy. 1482 */ 1483 mb_copy = m_copy(m, 0, M_COPYALL); 1484 if (mb_copy && 1485 (M_READONLY(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1486 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1487 if (mb_copy == NULL) { 1488 splx(s); 1489 return; 1490 } 1491 /* set MCAST flag to the outgoing packet */ 1492 mb_copy->m_flags |= M_MCAST; 1493 1494 /* 1495 * If we sourced the packet, call ip6_output since we may devide 1496 * the packet into fragments when the packet is too big for the 1497 * outgoing interface. 1498 * Otherwise, we can simply send the packet to the interface 1499 * sending queue. 1500 */ 1501 if (m->m_pkthdr.rcvif == NULL) { 1502 struct ip6_moptions im6o; 1503 1504 im6o.im6o_multicast_ifp = ifp; 1505 /* XXX: ip6_output will override ip6->ip6_hlim */ 1506 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1507 im6o.im6o_multicast_loop = 1; 1508 error = ip6_output(mb_copy, NULL, &ro, IPV6_FORWARDING, &im6o, 1509 NULL, NULL); 1510 1511 #ifdef MRT6DEBUG 1512 if (mrt6debug & DEBUG_XMIT) 1513 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1514 mifp - mif6table, error); 1515 #endif 1516 splx(s); 1517 return; 1518 } 1519 1520 /* 1521 * If we belong to the destination multicast group 1522 * on the outgoing interface, loop back a copy. 1523 */ 1524 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1525 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1526 if (in6m != NULL) { 1527 dst6->sin6_len = sizeof(struct sockaddr_in6); 1528 dst6->sin6_family = AF_INET6; 1529 dst6->sin6_addr = ip6->ip6_dst; 1530 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1531 } 1532 /* 1533 * Put the packet into the sending queue of the outgoing interface 1534 * if it would fit in the MTU of the interface. 1535 */ 1536 linkmtu = IN6_LINKMTU(ifp); 1537 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1538 dst6->sin6_len = sizeof(struct sockaddr_in6); 1539 dst6->sin6_family = AF_INET6; 1540 dst6->sin6_addr = ip6->ip6_dst; 1541 /* 1542 * We just call if_output instead of nd6_output here, since 1543 * we need no ND for a multicast forwarded packet...right? 1544 */ 1545 error = (*ifp->if_output)(ifp, mb_copy, 1546 (struct sockaddr *)&ro.ro_dst, NULL); 1547 #ifdef MRT6DEBUG 1548 if (mrt6debug & DEBUG_XMIT) 1549 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1550 mifp - mif6table, error); 1551 #endif 1552 } else { 1553 if (ip6_mcast_pmtu) 1554 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1555 else { 1556 #ifdef MRT6DEBUG 1557 if (mrt6debug & DEBUG_XMIT) 1558 log(LOG_DEBUG, 1559 "phyint_send: packet too big on %s o %s g %s" 1560 " size %d(discarded)\n", 1561 ifp->if_xname, 1562 ip6_sprintf(&ip6->ip6_src), 1563 ip6_sprintf(&ip6->ip6_dst), 1564 mb_copy->m_pkthdr.len); 1565 #endif /* MRT6DEBUG */ 1566 m_freem(mb_copy); /* simply discard the packet */ 1567 } 1568 } 1569 1570 splx(s); 1571 } 1572 1573 int 1574 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1575 { 1576 struct mbuf *mm; 1577 int i, len = m->m_pkthdr.len; 1578 struct sockaddr_in6 sin6; 1579 struct mrt6msg *im6; 1580 1581 #ifdef MRT6DEBUG 1582 if (mrt6debug) 1583 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1584 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1585 #endif 1586 ++pim6stat.pim6s_snd_registers; 1587 1588 /* Make a copy of the packet to send to the user level process */ 1589 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1590 if (mm == NULL) 1591 return ENOBUFS; 1592 mm->m_data += max_linkhdr; 1593 mm->m_len = sizeof(struct ip6_hdr); 1594 1595 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1596 m_freem(mm); 1597 return ENOBUFS; 1598 } 1599 i = MHLEN - M_LEADINGSPACE(mm); 1600 if (i > len) 1601 i = len; 1602 mm = m_pullup(mm, i); 1603 if (mm == NULL) 1604 return ENOBUFS; 1605 /* TODO: check it! */ 1606 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1607 1608 /* 1609 * Send message to routing daemon 1610 */ 1611 (void)memset(&sin6, 0, sizeof(sin6)); 1612 sin6.sin6_len = sizeof(sin6); 1613 sin6.sin6_family = AF_INET6; 1614 sin6.sin6_addr = ip6->ip6_src; 1615 1616 im6 = mtod(mm, struct mrt6msg *); 1617 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1618 im6->im6_mbz = 0; 1619 1620 im6->im6_mif = mif - mif6table; 1621 1622 /* iif info is not given for reg. encap.n */ 1623 mrt6stat.mrt6s_upcalls++; 1624 1625 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1626 #ifdef MRT6DEBUG 1627 if (mrt6debug) 1628 log(LOG_WARNING, 1629 "register_send: ip6_mrouter socket queue full\n"); 1630 #endif 1631 ++mrt6stat.mrt6s_upq_sockfull; 1632 return ENOBUFS; 1633 } 1634 return 0; 1635 } 1636 1637 /* 1638 * PIM sparse mode hook 1639 * Receives the pim control messages, and passes them up to the listening 1640 * socket, using rip6_input. 1641 * The only message processed is the REGISTER pim message; the pim header 1642 * is stripped off, and the inner packet is passed to register_mforward. 1643 */ 1644 int 1645 pim6_input(struct mbuf **mp, int *offp, int proto) 1646 { 1647 struct pim *pim; /* pointer to a pim struct */ 1648 struct ip6_hdr *ip6; 1649 int pimlen; 1650 struct mbuf *m = *mp; 1651 int minlen; 1652 int off = *offp; 1653 1654 ++pim6stat.pim6s_rcv_total; 1655 1656 ip6 = mtod(m, struct ip6_hdr *); 1657 pimlen = m->m_pkthdr.len - *offp; 1658 1659 /* 1660 * Validate lengths 1661 */ 1662 if (pimlen < PIM_MINLEN) { 1663 ++pim6stat.pim6s_rcv_tooshort; 1664 #ifdef MRT6DEBUG 1665 if (mrt6debug & DEBUG_PIM) 1666 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1667 #endif 1668 m_freem(m); 1669 return (IPPROTO_DONE); 1670 } 1671 1672 /* 1673 * if the packet is at least as big as a REGISTER, go ahead 1674 * and grab the PIM REGISTER header size, to avoid another 1675 * possible m_pullup() later. 1676 * 1677 * PIM_MINLEN == pimhdr + u_int32 == 8 1678 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1679 */ 1680 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1681 1682 /* 1683 * Make sure that the IP6 and PIM headers in contiguous memory, and 1684 * possibly the PIM REGISTER header 1685 */ 1686 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1687 if (pim == NULL) { 1688 pim6stat.pim6s_rcv_tooshort++; 1689 return IPPROTO_DONE; 1690 } 1691 1692 /* PIM version check */ 1693 if (pim->pim_ver != PIM_VERSION) { 1694 ++pim6stat.pim6s_rcv_badversion; 1695 #ifdef MRT6DEBUG 1696 log(LOG_ERR, 1697 "pim6_input: incorrect version %d, expecting %d\n", 1698 pim->pim_ver, PIM_VERSION); 1699 #endif 1700 m_freem(m); 1701 return (IPPROTO_DONE); 1702 } 1703 1704 #define PIM6_CHECKSUM 1705 #ifdef PIM6_CHECKSUM 1706 { 1707 int cksumlen; 1708 1709 /* 1710 * Validate checksum. 1711 * If PIM REGISTER, exclude the data packet 1712 */ 1713 if (pim->pim_type == PIM_REGISTER) 1714 cksumlen = PIM_MINLEN; 1715 else 1716 cksumlen = pimlen; 1717 1718 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1719 ++pim6stat.pim6s_rcv_badsum; 1720 #ifdef MRT6DEBUG 1721 if (mrt6debug & DEBUG_PIM) 1722 log(LOG_DEBUG, 1723 "pim6_input: invalid checksum\n"); 1724 #endif 1725 m_freem(m); 1726 return (IPPROTO_DONE); 1727 } 1728 } 1729 #endif /* PIM_CHECKSUM */ 1730 1731 if (pim->pim_type == PIM_REGISTER) { 1732 /* 1733 * since this is a REGISTER, we'll make a copy of the register 1734 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1735 * routing daemon. 1736 */ 1737 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1738 1739 struct mbuf *mcp; 1740 struct ip6_hdr *eip6; 1741 u_int32_t *reghdr; 1742 1743 ++pim6stat.pim6s_rcv_registers; 1744 1745 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1746 #ifdef MRT6DEBUG 1747 if (mrt6debug & DEBUG_PIM) 1748 log(LOG_DEBUG, 1749 "pim6_input: register mif not set: %d\n", 1750 reg_mif_num); 1751 #endif 1752 m_freem(m); 1753 return (IPPROTO_DONE); 1754 } 1755 1756 reghdr = (u_int32_t *)(pim + 1); 1757 1758 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1759 goto pim6_input_to_daemon; 1760 1761 /* 1762 * Validate length 1763 */ 1764 if (pimlen < PIM6_REG_MINLEN) { 1765 ++pim6stat.pim6s_rcv_tooshort; 1766 ++pim6stat.pim6s_rcv_badregisters; 1767 #ifdef MRT6DEBUG 1768 log(LOG_ERR, 1769 "pim6_input: register packet size too " 1770 "small %d from %s\n", 1771 pimlen, ip6_sprintf(&ip6->ip6_src)); 1772 #endif 1773 m_freem(m); 1774 return (IPPROTO_DONE); 1775 } 1776 1777 eip6 = (struct ip6_hdr *) (reghdr + 1); 1778 #ifdef MRT6DEBUG 1779 if (mrt6debug & DEBUG_PIM) 1780 log(LOG_DEBUG, 1781 "pim6_input[register], eip6: %s -> %s, " 1782 "eip6 plen %d\n", 1783 ip6_sprintf(&eip6->ip6_src), 1784 ip6_sprintf(&eip6->ip6_dst), 1785 ntohs(eip6->ip6_plen)); 1786 #endif 1787 1788 /* verify the version number of the inner packet */ 1789 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1790 ++pim6stat.pim6s_rcv_badregisters; 1791 #ifdef MRT6DEBUG 1792 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1793 "of the inner packet\n", 1794 (eip6->ip6_vfc & IPV6_VERSION)); 1795 #endif 1796 m_freem(m); 1797 return (IPPROTO_NONE); 1798 } 1799 1800 /* verify the inner packet is destined to a mcast group */ 1801 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1802 ++pim6stat.pim6s_rcv_badregisters; 1803 #ifdef MRT6DEBUG 1804 if (mrt6debug & DEBUG_PIM) 1805 log(LOG_DEBUG, 1806 "pim6_input: inner packet of register " 1807 "is not multicast %s\n", 1808 ip6_sprintf(&eip6->ip6_dst)); 1809 #endif 1810 m_freem(m); 1811 return (IPPROTO_DONE); 1812 } 1813 1814 /* 1815 * make a copy of the whole header to pass to the daemon later. 1816 */ 1817 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1818 if (mcp == NULL) { 1819 #ifdef MRT6DEBUG 1820 log(LOG_ERR, 1821 "pim6_input: pim register: " 1822 "could not copy register head\n"); 1823 #endif 1824 m_freem(m); 1825 return (IPPROTO_DONE); 1826 } 1827 1828 /* 1829 * forward the inner ip6 packet; point m_data at the inner ip6. 1830 */ 1831 m_adj(m, off + PIM_MINLEN); 1832 #ifdef MRT6DEBUG 1833 if (mrt6debug & DEBUG_PIM) { 1834 log(LOG_DEBUG, 1835 "pim6_input: forwarding decapsulated register: " 1836 "src %s, dst %s, mif %d\n", 1837 ip6_sprintf(&eip6->ip6_src), 1838 ip6_sprintf(&eip6->ip6_dst), 1839 reg_mif_num); 1840 } 1841 #endif 1842 1843 looutput(mif6table[reg_mif_num].m6_ifp, m, 1844 (struct sockaddr *) &dst, 1845 (struct rtentry *) NULL); 1846 1847 /* prepare the register head to send to the mrouting daemon */ 1848 m = mcp; 1849 } 1850 1851 /* 1852 * Pass the PIM message up to the daemon; if it is a register message 1853 * pass the 'head' only up to the daemon. This includes the 1854 * encapsulator ip6 header, pim header, register header and the 1855 * encapsulated ip6 header. 1856 */ 1857 pim6_input_to_daemon: 1858 rip6_input(&m, offp, proto); 1859 return (IPPROTO_DONE); 1860 } 1861 1862 /* 1863 * Sysctl for pim6 variables. 1864 */ 1865 int 1866 pim6_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1867 void *newp, size_t newlen) 1868 { 1869 /* All sysctl names at this level are terminal. */ 1870 if (namelen != 1) 1871 return (ENOTDIR); 1872 1873 switch (name[0]) { 1874 case PIM6CTL_STATS: 1875 if (newp != NULL) 1876 return (EPERM); 1877 return (sysctl_struct(oldp, oldlenp, newp, newlen, 1878 &pim6stat, sizeof(pim6stat))); 1879 1880 default: 1881 return (ENOPROTOOPT); 1882 } 1883 /* NOTREACHED */ 1884 } 1885