1 /* $OpenBSD: ip6_mroute.c,v 1.18 2002/02/10 23:15:05 deraadt 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 * IP multicast forwarding procedures 37 * 38 * Written by David Waitzman, BBN Labs, August 1988. 39 * Modified by Steve Deering, Stanford, February 1989. 40 * Modified by Mark J. Steiglitz, Stanford, May, 1991 41 * Modified by Van Jacobson, LBL, January 1993 42 * Modified by Ajit Thyagarajan, PARC, August 1993 43 * Modified by Bill Fenenr, PARC, April 1994 44 * 45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 46 */ 47 48 #ifndef _KERNEL 49 # ifdef KERNEL 50 # define _KERNEL 51 # endif 52 #endif 53 54 #include <sys/param.h> 55 #include <sys/systm.h> 56 #include <sys/timeout.h> 57 #include <sys/mbuf.h> 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/sockio.h> 61 #include <sys/protosw.h> 62 #include <sys/errno.h> 63 #include <sys/time.h> 64 #include <sys/kernel.h> 65 #include <sys/ioctl.h> 66 #include <sys/syslog.h> 67 68 #include <net/if.h> 69 #include <net/route.h> 70 #include <net/raw_cb.h> 71 72 #include <netinet/in.h> 73 #include <netinet/in_var.h> 74 75 #include <netinet/ip6.h> 76 #include <netinet6/ip6_var.h> 77 #include <netinet6/ip6_mroute.h> 78 #include <netinet6/pim6.h> 79 #include <netinet6/pim6_var.h> 80 81 #define M_HASCL(m) ((m)->m_flags & M_EXT) 82 83 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 84 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 85 86 static int set_pim6 __P((int *)); 87 static int get_pim6 __P((struct mbuf *)); 88 static int socket_send __P((struct socket *, struct mbuf *, 89 struct sockaddr_in6 *)); 90 static int register_send __P((struct ip6_hdr *, struct mif6 *, 91 struct mbuf *)); 92 93 /* 94 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 95 * except for netstat or debugging purposes. 96 */ 97 struct socket *ip6_mrouter = NULL; 98 int ip6_mrouter_ver = 0; 99 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 100 struct mrt6stat mrt6stat; 101 102 #define NO_RTE_FOUND 0x1 103 #define RTE_FOUND 0x2 104 105 struct mf6c *mf6ctable[MF6CTBLSIZ]; 106 u_char nexpire[MF6CTBLSIZ]; 107 struct mif6 mif6table[MAXMIFS]; 108 #ifdef MRT6DEBUG 109 u_int mrt6debug = 0; /* debug level */ 110 #define DEBUG_MFC 0x02 111 #define DEBUG_FORWARD 0x04 112 #define DEBUG_EXPIRE 0x08 113 #define DEBUG_XMIT 0x10 114 #define DEBUG_REG 0x20 115 #define DEBUG_PIM 0x40 116 #endif 117 118 static void expire_upcalls __P((void *)); 119 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 120 #define UPCALL_EXPIRE 6 /* number of timeouts */ 121 122 #ifdef INET 123 #ifdef MROUTING 124 extern struct socket *ip_mrouter; 125 #endif 126 #endif 127 128 /* 129 * 'Interfaces' associated with decapsulator (so we can tell 130 * packets that went through it from ones that get reflected 131 * by a broken gateway). These interfaces are never linked into 132 * the system ifnet list & no routes point to them. I.e., packets 133 * can't be sent this way. They only exist as a placeholder for 134 * multicast source verification. 135 */ 136 struct ifnet multicast_register_if; 137 138 #define ENCAP_HOPS 64 139 140 /* 141 * Private variables. 142 */ 143 static mifi_t nummifs = 0; 144 static mifi_t reg_mif_num = (mifi_t)-1; 145 146 static struct pim6stat pim6stat; 147 static int pim6; 148 149 /* 150 * Hash function for a source, group entry 151 */ 152 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 153 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 154 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 155 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 156 157 /* 158 * Find a route for a given origin IPv6 address and Multicast group address. 159 * Quality of service parameter to be added in the future!!! 160 */ 161 162 #define MF6CFIND(o, g, rt) do { \ 163 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 164 rt = NULL; \ 165 mrt6stat.mrt6s_mfc_lookups++; \ 166 while (_rt) { \ 167 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 168 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 169 (_rt->mf6c_stall == NULL)) { \ 170 rt = _rt; \ 171 break; \ 172 } \ 173 _rt = _rt->mf6c_next; \ 174 } \ 175 if (rt == NULL) { \ 176 mrt6stat.mrt6s_mfc_misses++; \ 177 } \ 178 } while (0) 179 180 /* 181 * Macros to compute elapsed time efficiently 182 * Borrowed from Van Jacobson's scheduling code 183 */ 184 #define TV_DELTA(a, b, delta) do { \ 185 int xxs; \ 186 \ 187 delta = (a).tv_usec - (b).tv_usec; \ 188 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 189 switch (xxs) { \ 190 case 2: \ 191 delta += 1000000; \ 192 /* fall through */ \ 193 case 1: \ 194 delta += 1000000; \ 195 break; \ 196 default: \ 197 delta += (1000000 * xxs); \ 198 } \ 199 } \ 200 } while (0) 201 202 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 203 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 204 205 #ifdef UPCALL_TIMING 206 #define UPCALL_MAX 50 207 u_long upcall_data[UPCALL_MAX + 1]; 208 static void collate(); 209 #endif /* UPCALL_TIMING */ 210 211 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 212 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 213 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 214 static int add_m6if __P((struct mif6ctl *)); 215 static int del_m6if __P((mifi_t *)); 216 static int add_m6fc __P((struct mf6cctl *)); 217 static int del_m6fc __P((struct mf6cctl *)); 218 219 static struct timeout expire_upcalls_ch; 220 221 /* 222 * Handle MRT setsockopt commands to modify the multicast routing tables. 223 */ 224 int 225 ip6_mrouter_set(cmd, so, m) 226 int cmd; 227 struct socket *so; 228 struct mbuf *m; 229 { 230 if (cmd != MRT6_INIT && so != ip6_mrouter) 231 return EACCES; 232 233 switch (cmd) { 234 #ifdef MRT6_OINIT 235 case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd); 236 #endif 237 case MRT6_INIT: return ip6_mrouter_init(so, m, cmd); 238 case MRT6_DONE: return ip6_mrouter_done(); 239 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 240 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 241 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 242 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 243 case MRT6_PIM: return set_pim6(mtod(m, int *)); 244 default: return EOPNOTSUPP; 245 } 246 } 247 248 /* 249 * Handle MRT getsockopt commands 250 */ 251 int 252 ip6_mrouter_get(cmd, so, m) 253 int cmd; 254 struct socket *so; 255 struct mbuf **m; 256 { 257 struct mbuf *mb; 258 259 if (so != ip6_mrouter) return EACCES; 260 261 *m = mb = m_get(M_WAIT, MT_SOOPTS); 262 263 switch (cmd) { 264 case MRT6_PIM: 265 return get_pim6(mb); 266 default: 267 m_free(mb); 268 return EOPNOTSUPP; 269 } 270 } 271 272 /* 273 * Handle ioctl commands to obtain information from the cache 274 */ 275 int 276 mrt6_ioctl(cmd, data) 277 int cmd; 278 caddr_t data; 279 { 280 int error = 0; 281 282 switch (cmd) { 283 case SIOCGETSGCNT_IN6: 284 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 285 break; /* for safety */ 286 case SIOCGETMIFCNT_IN6: 287 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 288 break; /* for safety */ 289 default: 290 return (EINVAL); 291 break; 292 } 293 return error; 294 } 295 296 /* 297 * returns the packet, byte, rpf-failure count for the source group provided 298 */ 299 static int 300 get_sg_cnt(req) 301 struct sioc_sg_req6 *req; 302 { 303 struct mf6c *rt; 304 int s; 305 306 s = splnet(); 307 308 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 309 splx(s); 310 if (rt != NULL) { 311 req->pktcnt = rt->mf6c_pkt_cnt; 312 req->bytecnt = rt->mf6c_byte_cnt; 313 req->wrong_if = rt->mf6c_wrong_if; 314 } else 315 return(ESRCH); 316 #if 0 317 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 318 #endif 319 320 return 0; 321 } 322 323 /* 324 * returns the input and output packet and byte counts on the mif provided 325 */ 326 static int 327 get_mif6_cnt(req) 328 struct sioc_mif_req6 *req; 329 { 330 mifi_t mifi = req->mifi; 331 332 if (mifi >= nummifs) 333 return EINVAL; 334 335 req->icount = mif6table[mifi].m6_pkt_in; 336 req->ocount = mif6table[mifi].m6_pkt_out; 337 req->ibytes = mif6table[mifi].m6_bytes_in; 338 req->obytes = mif6table[mifi].m6_bytes_out; 339 340 return 0; 341 } 342 343 /* 344 * Get PIM processiong global 345 */ 346 static int 347 get_pim6(m) 348 struct mbuf *m; 349 { 350 int *i; 351 352 i = mtod(m, int *); 353 354 *i = pim6; 355 356 return 0; 357 } 358 359 static int 360 set_pim6(i) 361 int *i; 362 { 363 if ((*i != 1) && (*i != 0)) 364 return EINVAL; 365 366 pim6 = *i; 367 368 return 0; 369 } 370 371 /* 372 * Enable multicast routing 373 */ 374 static int 375 ip6_mrouter_init(so, m, cmd) 376 struct socket *so; 377 struct mbuf *m; 378 int cmd; 379 { 380 int *v; 381 382 #ifdef MRT6DEBUG 383 if (mrt6debug) 384 log(LOG_DEBUG, 385 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 386 so->so_type, so->so_proto->pr_protocol); 387 #endif 388 389 if (so->so_type != SOCK_RAW || 390 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 391 return EOPNOTSUPP; 392 393 if (!m || (m->m_len != sizeof(int *))) 394 return ENOPROTOOPT; 395 396 v = mtod(m, int *); 397 if (*v != 1) 398 return ENOPROTOOPT; 399 400 if (ip6_mrouter != NULL) return EADDRINUSE; 401 402 ip6_mrouter = so; 403 ip6_mrouter_ver = cmd; 404 405 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 406 bzero((caddr_t)nexpire, sizeof(nexpire)); 407 408 pim6 = 0;/* used for stubbing out/in pim stuff */ 409 410 timeout_set(&expire_upcalls_ch, expire_upcalls, NULL); 411 timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT); 412 413 #ifdef MRT6DEBUG 414 if (mrt6debug) 415 log(LOG_DEBUG, "ip6_mrouter_init\n"); 416 #endif 417 418 return 0; 419 } 420 421 /* 422 * Disable multicast routing 423 */ 424 int 425 ip6_mrouter_done() 426 { 427 mifi_t mifi; 428 int i; 429 struct ifnet *ifp; 430 struct in6_ifreq ifr; 431 struct mf6c *rt; 432 struct rtdetq *rte; 433 int s; 434 435 s = splnet(); 436 437 /* 438 * For each phyint in use, disable promiscuous reception of all IPv6 439 * multicasts. 440 */ 441 #ifdef INET 442 #ifdef MROUTING 443 /* 444 * If there is still IPv4 multicast routing daemon, 445 * we remain interfaces to receive all muliticasted packets. 446 * XXX: there may be an interface in which the IPv4 multicast 447 * daemon is not interested... 448 */ 449 if (!ip_mrouter) 450 #endif 451 #endif 452 { 453 for (mifi = 0; mifi < nummifs; mifi++) { 454 if (mif6table[mifi].m6_ifp && 455 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 456 ifr.ifr_addr.sin6_family = AF_INET6; 457 ifr.ifr_addr.sin6_addr= in6addr_any; 458 ifp = mif6table[mifi].m6_ifp; 459 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 460 (caddr_t)&ifr); 461 } 462 } 463 } 464 #ifdef notyet 465 bzero((caddr_t)qtable, sizeof(qtable)); 466 bzero((caddr_t)tbftable, sizeof(tbftable)); 467 #endif 468 bzero((caddr_t)mif6table, sizeof(mif6table)); 469 nummifs = 0; 470 471 pim6 = 0; /* used to stub out/in pim specific code */ 472 473 timeout_del(&expire_upcalls_ch); 474 475 /* 476 * Free all multicast forwarding cache entries. 477 */ 478 for (i = 0; i < MF6CTBLSIZ; i++) { 479 rt = mf6ctable[i]; 480 while (rt) { 481 struct mf6c *frt; 482 483 for (rte = rt->mf6c_stall; rte != NULL; ) { 484 struct rtdetq *n = rte->next; 485 486 m_free(rte->m); 487 free(rte, M_MRTABLE); 488 rte = n; 489 } 490 frt = rt; 491 rt = rt->mf6c_next; 492 free(frt, M_MRTABLE); 493 } 494 } 495 496 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 497 498 /* 499 * Reset de-encapsulation cache 500 */ 501 reg_mif_num = -1; 502 503 ip6_mrouter = NULL; 504 ip6_mrouter_ver = 0; 505 506 splx(s); 507 508 #ifdef MRT6DEBUG 509 if (mrt6debug) 510 log(LOG_DEBUG, "ip6_mrouter_done\n"); 511 #endif 512 513 return 0; 514 } 515 516 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 517 518 /* 519 * Add a mif to the mif table 520 */ 521 static int 522 add_m6if(mifcp) 523 struct mif6ctl *mifcp; 524 { 525 struct mif6 *mifp; 526 struct ifnet *ifp; 527 struct in6_ifreq ifr; 528 int error, s; 529 #ifdef notyet 530 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 531 #endif 532 533 if (mifcp->mif6c_mifi >= MAXMIFS) 534 return EINVAL; 535 mifp = mif6table + mifcp->mif6c_mifi; 536 if (mifp->m6_ifp) 537 return EADDRINUSE; /* XXX: is it appropriate? */ 538 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 539 return ENXIO; 540 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 541 542 if (mifcp->mif6c_flags & MIFF_REGISTER) { 543 if (reg_mif_num == (mifi_t)-1) { 544 strcpy(multicast_register_if.if_xname, 545 "register_mif"); /* XXX */ 546 multicast_register_if.if_flags |= IFF_LOOPBACK; 547 multicast_register_if.if_index = mifcp->mif6c_mifi; 548 reg_mif_num = mifcp->mif6c_mifi; 549 } 550 551 ifp = &multicast_register_if; 552 553 } /* if REGISTER */ 554 else { 555 /* Make sure the interface supports multicast */ 556 if ((ifp->if_flags & IFF_MULTICAST) == 0) 557 return EOPNOTSUPP; 558 559 s = splnet(); 560 561 /* 562 * Enable promiscuous reception of all IPv6 multicasts 563 * from the interface. 564 */ 565 ifr.ifr_addr.sin6_family = AF_INET6; 566 ifr.ifr_addr.sin6_addr = in6addr_any; 567 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 568 569 splx(s); 570 if (error) 571 return error; 572 } 573 574 s = splnet(); 575 576 mifp->m6_flags = mifcp->mif6c_flags; 577 mifp->m6_ifp = ifp; 578 #ifdef notyet 579 /* scaling up here allows division by 1024 in critical code */ 580 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 581 #endif 582 /* initialize per mif pkt counters */ 583 mifp->m6_pkt_in = 0; 584 mifp->m6_pkt_out = 0; 585 mifp->m6_bytes_in = 0; 586 mifp->m6_bytes_out = 0; 587 splx(s); 588 589 /* Adjust nummifs up if the mifi is higher than nummifs */ 590 if (nummifs <= mifcp->mif6c_mifi) 591 nummifs = mifcp->mif6c_mifi + 1; 592 593 #ifdef MRT6DEBUG 594 if (mrt6debug) 595 log(LOG_DEBUG, 596 "add_mif #%d, phyint %s%d\n", 597 mifcp->mif6c_mifi, 598 ifp->if_name, ifp->if_unit); 599 #endif 600 601 return 0; 602 } 603 604 /* 605 * Delete a mif from the mif table 606 */ 607 static int 608 del_m6if(mifip) 609 mifi_t *mifip; 610 { 611 struct mif6 *mifp = mif6table + *mifip; 612 mifi_t mifi; 613 struct ifnet *ifp; 614 struct in6_ifreq ifr; 615 int s; 616 617 if (*mifip >= nummifs) 618 return EINVAL; 619 if (mifp->m6_ifp == NULL) 620 return EINVAL; 621 622 s = splnet(); 623 624 if (!(mifp->m6_flags & MIFF_REGISTER)) { 625 /* 626 * XXX: what if there is yet IPv4 multicast daemon 627 * using the interface? 628 */ 629 ifp = mifp->m6_ifp; 630 631 ifr.ifr_addr.sin6_family = AF_INET6; 632 ifr.ifr_addr.sin6_addr = in6addr_any; 633 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 634 } 635 636 #ifdef notyet 637 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 638 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 639 #endif 640 bzero((caddr_t)mifp, sizeof (*mifp)); 641 642 /* Adjust nummifs down */ 643 for (mifi = nummifs; mifi > 0; mifi--) 644 if (mif6table[mifi - 1].m6_ifp) 645 break; 646 nummifs = mifi; 647 648 splx(s); 649 650 #ifdef MRT6DEBUG 651 if (mrt6debug) 652 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 653 #endif 654 655 return 0; 656 } 657 658 /* 659 * Add an mfc entry 660 */ 661 static int 662 add_m6fc(mfccp) 663 struct mf6cctl *mfccp; 664 { 665 struct mf6c *rt; 666 u_long hash; 667 struct rtdetq *rte; 668 u_short nstl; 669 int s; 670 671 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 672 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 673 674 /* If an entry already exists, just update the fields */ 675 if (rt) { 676 #ifdef MRT6DEBUG 677 if (mrt6debug & DEBUG_MFC) 678 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 679 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 680 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 681 mfccp->mf6cc_parent); 682 #endif 683 684 s = splnet(); 685 686 rt->mf6c_parent = mfccp->mf6cc_parent; 687 rt->mf6c_ifset = mfccp->mf6cc_ifset; 688 splx(s); 689 return 0; 690 } 691 692 /* 693 * Find the entry for which the upcall was made and update 694 */ 695 s = splnet(); 696 697 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 698 mfccp->mf6cc_mcastgrp.sin6_addr); 699 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 700 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 701 &mfccp->mf6cc_origin.sin6_addr) && 702 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 703 &mfccp->mf6cc_mcastgrp.sin6_addr) && 704 (rt->mf6c_stall != NULL)) { 705 706 if (nstl++) 707 log(LOG_ERR, 708 "add_m6fc: %s o %s g %s p %x dbx %p\n", 709 "multiple kernel entries", 710 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 711 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 712 mfccp->mf6cc_parent, rt->mf6c_stall); 713 714 #ifdef MRT6DEBUG 715 if (mrt6debug & DEBUG_MFC) 716 log(LOG_DEBUG, 717 "add_m6fc o %s g %s p %x dbg %x\n", 718 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 719 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 720 mfccp->mf6cc_parent, rt->mf6c_stall); 721 #endif 722 723 rt->mf6c_origin = mfccp->mf6cc_origin; 724 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 725 rt->mf6c_parent = mfccp->mf6cc_parent; 726 rt->mf6c_ifset = mfccp->mf6cc_ifset; 727 /* initialize pkt counters per src-grp */ 728 rt->mf6c_pkt_cnt = 0; 729 rt->mf6c_byte_cnt = 0; 730 rt->mf6c_wrong_if = 0; 731 732 rt->mf6c_expire = 0; /* Don't clean this guy up */ 733 nexpire[hash]--; 734 735 /* free packets Qed at the end of this entry */ 736 for (rte = rt->mf6c_stall; rte != NULL; ) { 737 struct rtdetq *n = rte->next; 738 ip6_mdq(rte->m, rte->ifp, rt); 739 m_freem(rte->m); 740 #ifdef UPCALL_TIMING 741 collate(&(rte->t)); 742 #endif /* UPCALL_TIMING */ 743 free(rte, M_MRTABLE); 744 rte = n; 745 } 746 rt->mf6c_stall = NULL; 747 } 748 } 749 750 /* 751 * It is possible that an entry is being inserted without an upcall 752 */ 753 if (nstl == 0) { 754 #ifdef MRT6DEBUG 755 if (mrt6debug & DEBUG_MFC) 756 log(LOG_DEBUG, 757 "add_m6fc no upcall h %d o %s g %s p %x\n", 758 hash, 759 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 760 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 761 mfccp->mf6cc_parent); 762 #endif 763 764 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 765 766 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 767 &mfccp->mf6cc_origin.sin6_addr)&& 768 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 769 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 770 771 rt->mf6c_origin = mfccp->mf6cc_origin; 772 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 773 rt->mf6c_parent = mfccp->mf6cc_parent; 774 rt->mf6c_ifset = mfccp->mf6cc_ifset; 775 /* initialize pkt counters per src-grp */ 776 rt->mf6c_pkt_cnt = 0; 777 rt->mf6c_byte_cnt = 0; 778 rt->mf6c_wrong_if = 0; 779 780 if (rt->mf6c_expire) 781 nexpire[hash]--; 782 rt->mf6c_expire = 0; 783 } 784 } 785 if (rt == NULL) { 786 /* no upcall, so make a new entry */ 787 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 788 M_NOWAIT); 789 if (rt == NULL) { 790 splx(s); 791 return ENOBUFS; 792 } 793 794 /* insert new entry at head of hash chain */ 795 rt->mf6c_origin = mfccp->mf6cc_origin; 796 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 797 rt->mf6c_parent = mfccp->mf6cc_parent; 798 rt->mf6c_ifset = mfccp->mf6cc_ifset; 799 /* initialize pkt counters per src-grp */ 800 rt->mf6c_pkt_cnt = 0; 801 rt->mf6c_byte_cnt = 0; 802 rt->mf6c_wrong_if = 0; 803 rt->mf6c_expire = 0; 804 rt->mf6c_stall = NULL; 805 806 /* link into table */ 807 rt->mf6c_next = mf6ctable[hash]; 808 mf6ctable[hash] = rt; 809 } 810 } 811 splx(s); 812 return 0; 813 } 814 815 #ifdef UPCALL_TIMING 816 /* 817 * collect delay statistics on the upcalls 818 */ 819 static void 820 collate(t) 821 struct timeval *t; 822 { 823 u_long d; 824 struct timeval tp; 825 u_long delta; 826 827 GET_TIME(tp); 828 829 if (TV_LT(*t, tp)) 830 { 831 TV_DELTA(tp, *t, delta); 832 833 d = delta >> 10; 834 if (d > UPCALL_MAX) 835 d = UPCALL_MAX; 836 837 ++upcall_data[d]; 838 } 839 } 840 #endif /* UPCALL_TIMING */ 841 842 /* 843 * Delete an mfc entry 844 */ 845 static int 846 del_m6fc(mfccp) 847 struct mf6cctl *mfccp; 848 { 849 struct sockaddr_in6 origin; 850 struct sockaddr_in6 mcastgrp; 851 struct mf6c *rt; 852 struct mf6c **nptr; 853 u_long hash; 854 int s; 855 856 origin = mfccp->mf6cc_origin; 857 mcastgrp = mfccp->mf6cc_mcastgrp; 858 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 859 860 #ifdef MRT6DEBUG 861 if (mrt6debug & DEBUG_MFC) 862 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 863 ip6_sprintf(&origin.sin6_addr), 864 ip6_sprintf(&mcastgrp.sin6_addr)); 865 #endif 866 867 s = splnet(); 868 869 nptr = &mf6ctable[hash]; 870 while ((rt = *nptr) != NULL) { 871 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 872 &rt->mf6c_origin.sin6_addr) && 873 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 874 &rt->mf6c_mcastgrp.sin6_addr) && 875 rt->mf6c_stall == NULL) 876 break; 877 878 nptr = &rt->mf6c_next; 879 } 880 if (rt == NULL) { 881 splx(s); 882 return EADDRNOTAVAIL; 883 } 884 885 *nptr = rt->mf6c_next; 886 free(rt, M_MRTABLE); 887 888 splx(s); 889 890 return 0; 891 } 892 893 static int 894 socket_send(s, mm, src) 895 struct socket *s; 896 struct mbuf *mm; 897 struct sockaddr_in6 *src; 898 { 899 if (s) { 900 if (sbappendaddr(&s->so_rcv, 901 (struct sockaddr *)src, 902 mm, (struct mbuf *)0) != 0) { 903 sorwakeup(s); 904 return 0; 905 } 906 } 907 m_freem(mm); 908 return -1; 909 } 910 911 /* 912 * IPv6 multicast forwarding function. This function assumes that the packet 913 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 914 * pointed to by "ifp", and the packet is to be relayed to other networks 915 * that have members of the packet's destination IPv6 multicast group. 916 * 917 * The packet is returned unscathed to the caller, unless it is 918 * erroneous, in which case a non-zero return value tells the caller to 919 * discard it. 920 */ 921 922 int 923 ip6_mforward(ip6, ifp, m) 924 struct ip6_hdr *ip6; 925 struct ifnet *ifp; 926 struct mbuf *m; 927 { 928 struct mf6c *rt; 929 struct mif6 *mifp; 930 struct mbuf *mm; 931 int s; 932 mifi_t mifi; 933 long time_second = time.tv_sec; 934 935 #ifdef MRT6DEBUG 936 if (mrt6debug & DEBUG_FORWARD) 937 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 938 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 939 ifp->if_index); 940 #endif 941 942 /* 943 * Don't forward a packet with Hop limit of zero or one, 944 * or a packet destined to a local-only group. 945 */ 946 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 947 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 948 return 0; 949 ip6->ip6_hlim--; 950 951 /* 952 * Source address check: do not forward packets with unspecified 953 * source. It was discussed in July 2000, on ipngwg mailing list. 954 * This is rather more serious than unicast cases, because some 955 * MLD packets can be sent with the unspecified source address 956 * (although such packets must normally set 1 to the hop limit field). 957 */ 958 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 959 ip6stat.ip6s_cantforward++; 960 if (ip6_log_time + ip6_log_interval < time_second) { 961 ip6_log_time = time_second; 962 log(LOG_DEBUG, 963 "cannot forward " 964 "from %s to %s nxt %d received on %s\n", 965 ip6_sprintf(&ip6->ip6_src), 966 ip6_sprintf(&ip6->ip6_dst), 967 ip6->ip6_nxt, 968 m->m_pkthdr.rcvif->if_xname); 969 } 970 return 0; 971 } 972 973 /* 974 * Determine forwarding mifs from the forwarding cache table 975 */ 976 s = splnet(); 977 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 978 979 /* Entry exists, so forward if necessary */ 980 if (rt) { 981 splx(s); 982 return (ip6_mdq(m, ifp, rt)); 983 } else { 984 /* 985 * If we don't have a route for packet's origin, 986 * Make a copy of the packet & 987 * send message to routing daemon 988 */ 989 990 struct mbuf *mb0; 991 struct rtdetq *rte; 992 u_long hash; 993 /* int i, npkts;*/ 994 #ifdef UPCALL_TIMING 995 struct timeval tp; 996 997 GET_TIME(tp); 998 #endif /* UPCALL_TIMING */ 999 1000 mrt6stat.mrt6s_no_route++; 1001 #ifdef MRT6DEBUG 1002 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1003 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1004 ip6_sprintf(&ip6->ip6_src), 1005 ip6_sprintf(&ip6->ip6_dst)); 1006 #endif 1007 1008 /* 1009 * Allocate mbufs early so that we don't do extra work if we 1010 * are just going to fail anyway. 1011 */ 1012 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1013 M_NOWAIT); 1014 if (rte == NULL) { 1015 splx(s); 1016 return ENOBUFS; 1017 } 1018 mb0 = m_copy(m, 0, M_COPYALL); 1019 /* 1020 * Pullup packet header if needed before storing it, 1021 * as other references may modify it in the meantime. 1022 */ 1023 if (mb0 && 1024 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1025 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1026 if (mb0 == NULL) { 1027 free(rte, M_MRTABLE); 1028 splx(s); 1029 return ENOBUFS; 1030 } 1031 1032 /* is there an upcall waiting for this packet? */ 1033 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1034 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1035 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1036 &rt->mf6c_origin.sin6_addr) && 1037 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1038 &rt->mf6c_mcastgrp.sin6_addr) && 1039 (rt->mf6c_stall != NULL)) 1040 break; 1041 } 1042 1043 if (rt == NULL) { 1044 struct mrt6msg *im; 1045 #ifdef MRT6_OINIT 1046 struct omrt6msg *oim; 1047 #endif 1048 1049 /* no upcall, so make a new entry */ 1050 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1051 M_NOWAIT); 1052 if (rt == NULL) { 1053 free(rte, M_MRTABLE); 1054 m_freem(mb0); 1055 splx(s); 1056 return ENOBUFS; 1057 } 1058 /* 1059 * Make a copy of the header to send to the user 1060 * level process 1061 */ 1062 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1063 1064 if (mm == NULL) { 1065 free(rte, M_MRTABLE); 1066 m_freem(mb0); 1067 free(rt, M_MRTABLE); 1068 splx(s); 1069 return ENOBUFS; 1070 } 1071 1072 /* 1073 * Send message to routing daemon 1074 */ 1075 sin6.sin6_addr = ip6->ip6_src; 1076 1077 im = NULL; 1078 #ifdef MRT6_OINIT 1079 oim = NULL; 1080 #endif 1081 switch (ip6_mrouter_ver) { 1082 #ifdef MRT6_OINIT 1083 case MRT6_OINIT: 1084 oim = mtod(mm, struct omrt6msg *); 1085 oim->im6_msgtype = MRT6MSG_NOCACHE; 1086 oim->im6_mbz = 0; 1087 break; 1088 #endif 1089 case MRT6_INIT: 1090 im = mtod(mm, struct mrt6msg *); 1091 im->im6_msgtype = MRT6MSG_NOCACHE; 1092 im->im6_mbz = 0; 1093 break; 1094 default: 1095 free(rte, M_MRTABLE); 1096 m_freem(mb0); 1097 free(rt, M_MRTABLE); 1098 splx(s); 1099 return EINVAL; 1100 } 1101 1102 #ifdef MRT6DEBUG 1103 if (mrt6debug & DEBUG_FORWARD) 1104 log(LOG_DEBUG, 1105 "getting the iif info in the kernel\n"); 1106 #endif 1107 1108 for (mifp = mif6table, mifi = 0; 1109 mifi < nummifs && mifp->m6_ifp != ifp; 1110 mifp++, mifi++) 1111 ; 1112 1113 switch (ip6_mrouter_ver) { 1114 #ifdef MRT6_OINIT 1115 case MRT6_OINIT: 1116 oim->im6_mif = mifi; 1117 break; 1118 #endif 1119 case MRT6_INIT: 1120 im->im6_mif = mifi; 1121 break; 1122 } 1123 1124 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1125 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1126 "socket queue full\n"); 1127 mrt6stat.mrt6s_upq_sockfull++; 1128 free(rte, M_MRTABLE); 1129 m_freem(mb0); 1130 free(rt, M_MRTABLE); 1131 splx(s); 1132 return ENOBUFS; 1133 } 1134 1135 mrt6stat.mrt6s_upcalls++; 1136 1137 /* insert new entry at head of hash chain */ 1138 bzero(rt, sizeof(*rt)); 1139 rt->mf6c_origin.sin6_family = AF_INET6; 1140 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1141 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1142 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1143 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1144 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1145 rt->mf6c_expire = UPCALL_EXPIRE; 1146 nexpire[hash]++; 1147 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1148 1149 /* link into table */ 1150 rt->mf6c_next = mf6ctable[hash]; 1151 mf6ctable[hash] = rt; 1152 /* Add this entry to the end of the queue */ 1153 rt->mf6c_stall = rte; 1154 } else { 1155 /* determine if q has overflowed */ 1156 struct rtdetq **p; 1157 int npkts = 0; 1158 1159 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1160 if (++npkts > MAX_UPQ6) { 1161 mrt6stat.mrt6s_upq_ovflw++; 1162 free(rte, M_MRTABLE); 1163 m_freem(mb0); 1164 splx(s); 1165 return 0; 1166 } 1167 1168 /* Add this entry to the end of the queue */ 1169 *p = rte; 1170 } 1171 1172 rte->next = NULL; 1173 rte->m = mb0; 1174 rte->ifp = ifp; 1175 #ifdef UPCALL_TIMING 1176 rte->t = tp; 1177 #endif /* UPCALL_TIMING */ 1178 1179 splx(s); 1180 1181 return 0; 1182 } 1183 } 1184 1185 /* 1186 * Clean up cache entries if upcalls are not serviced 1187 * Call from the Slow Timeout mechanism, every half second. 1188 */ 1189 static void 1190 expire_upcalls(unused) 1191 void *unused; 1192 { 1193 struct rtdetq *rte; 1194 struct mf6c *mfc, **nptr; 1195 int i; 1196 int s; 1197 1198 s = splnet(); 1199 1200 for (i = 0; i < MF6CTBLSIZ; i++) { 1201 if (nexpire[i] == 0) 1202 continue; 1203 nptr = &mf6ctable[i]; 1204 while ((mfc = *nptr) != NULL) { 1205 rte = mfc->mf6c_stall; 1206 /* 1207 * Skip real cache entries 1208 * Make sure it wasn't marked to not expire (shouldn't happen) 1209 * If it expires now 1210 */ 1211 if (rte != NULL && 1212 mfc->mf6c_expire != 0 && 1213 --mfc->mf6c_expire == 0) { 1214 #ifdef MRT6DEBUG 1215 if (mrt6debug & DEBUG_EXPIRE) 1216 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1217 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1218 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1219 #endif 1220 /* 1221 * drop all the packets 1222 * free the mbuf with the pkt, if, timing info 1223 */ 1224 do { 1225 struct rtdetq *n = rte->next; 1226 m_freem(rte->m); 1227 free(rte, M_MRTABLE); 1228 rte = n; 1229 } while (rte != NULL); 1230 mrt6stat.mrt6s_cache_cleanups++; 1231 nexpire[i]--; 1232 1233 *nptr = mfc->mf6c_next; 1234 free(mfc, M_MRTABLE); 1235 } else { 1236 nptr = &mfc->mf6c_next; 1237 } 1238 } 1239 } 1240 splx(s); 1241 timeout_set(&expire_upcalls_ch, expire_upcalls, NULL); 1242 timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT); 1243 } 1244 1245 /* 1246 * Packet forwarding routine once entry in the cache is made 1247 */ 1248 static int 1249 ip6_mdq(m, ifp, rt) 1250 struct mbuf *m; 1251 struct ifnet *ifp; 1252 struct mf6c *rt; 1253 { 1254 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1255 mifi_t mifi, iif; 1256 struct mif6 *mifp; 1257 int plen = m->m_pkthdr.len; 1258 1259 /* 1260 * Macro to send packet on mif. Since RSVP packets don't get counted on 1261 * input, they shouldn't get counted on output, so statistics keeping is 1262 * separate. 1263 */ 1264 1265 #define MC6_SEND(ip6, mifp, m) do { \ 1266 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1267 register_send((ip6), (mifp), (m)); \ 1268 else \ 1269 phyint_send((ip6), (mifp), (m)); \ 1270 } while (0) 1271 1272 /* 1273 * Don't forward if it didn't arrive from the parent mif 1274 * for its origin. 1275 */ 1276 mifi = rt->mf6c_parent; 1277 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1278 /* came in the wrong interface */ 1279 #ifdef MRT6DEBUG 1280 if (mrt6debug & DEBUG_FORWARD) 1281 log(LOG_DEBUG, 1282 "wrong if: ifid %d mifi %d mififid %x\n", 1283 ifp->if_index, mifi, 1284 mif6table[mifi].m6_ifp->if_index); 1285 #endif 1286 mrt6stat.mrt6s_wrong_if++; 1287 rt->mf6c_wrong_if++; 1288 /* 1289 * If we are doing PIM processing, and we are forwarding 1290 * packets on this interface, send a message to the 1291 * routing daemon. 1292 */ 1293 /* have to make sure this is a valid mif */ 1294 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1295 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1296 /* 1297 * Check the M_LOOP flag to avoid an 1298 * unnecessary PIM assert. 1299 * XXX: M_LOOP is an ad-hoc hack... 1300 */ 1301 static struct sockaddr_in6 sin6 = 1302 { sizeof(sin6), AF_INET6 }; 1303 1304 struct mbuf *mm; 1305 struct mrt6msg *im; 1306 #ifdef MRT6_OINIT 1307 struct omrt6msg *oim; 1308 #endif 1309 1310 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1311 if (mm && 1312 (M_HASCL(mm) || 1313 mm->m_len < sizeof(struct ip6_hdr))) 1314 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1315 if (mm == NULL) 1316 return ENOBUFS; 1317 1318 #ifdef MRT6_OINIT 1319 oim = NULL; 1320 #endif 1321 im = NULL; 1322 switch (ip6_mrouter_ver) { 1323 #ifdef MRT6_OINIT 1324 case MRT6_OINIT: 1325 oim = mtod(mm, struct omrt6msg *); 1326 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1327 oim->im6_mbz = 0; 1328 break; 1329 #endif 1330 case MRT6_INIT: 1331 im = mtod(mm, struct mrt6msg *); 1332 im->im6_msgtype = MRT6MSG_WRONGMIF; 1333 im->im6_mbz = 0; 1334 break; 1335 default: 1336 m_freem(mm); 1337 return EINVAL; 1338 } 1339 1340 for (mifp = mif6table, iif = 0; 1341 iif < nummifs && mifp && 1342 mifp->m6_ifp != ifp; 1343 mifp++, iif++) 1344 ; 1345 1346 switch (ip6_mrouter_ver) { 1347 #ifdef MRT6_OINIT 1348 case MRT6_OINIT: 1349 oim->im6_mif = iif; 1350 sin6.sin6_addr = oim->im6_src; 1351 break; 1352 #endif 1353 case MRT6_INIT: 1354 im->im6_mif = iif; 1355 sin6.sin6_addr = im->im6_src; 1356 break; 1357 } 1358 1359 mrt6stat.mrt6s_upcalls++; 1360 1361 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1362 #ifdef MRT6DEBUG 1363 if (mrt6debug) 1364 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1365 #endif 1366 ++mrt6stat.mrt6s_upq_sockfull; 1367 return ENOBUFS; 1368 } /* if socket Q full */ 1369 } /* if PIM */ 1370 return 0; 1371 } /* if wrong iif */ 1372 1373 /* If I sourced this packet, it counts as output, else it was input. */ 1374 if (m->m_pkthdr.rcvif == NULL) { 1375 /* XXX: is rcvif really NULL when output?? */ 1376 mif6table[mifi].m6_pkt_out++; 1377 mif6table[mifi].m6_bytes_out += plen; 1378 } else { 1379 mif6table[mifi].m6_pkt_in++; 1380 mif6table[mifi].m6_bytes_in += plen; 1381 } 1382 rt->mf6c_pkt_cnt++; 1383 rt->mf6c_byte_cnt += plen; 1384 1385 /* 1386 * For each mif, forward a copy of the packet if there are group 1387 * members downstream on the interface. 1388 */ 1389 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1390 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1391 /* 1392 * check if the outgoing packet is going to break 1393 * a scope boundary. 1394 * XXX For packets through PIM register tunnel 1395 * interface, we believe a routing daemon. 1396 */ 1397 if ((mif6table[rt->mf6c_parent].m6_flags & 1398 MIFF_REGISTER) == 0 && 1399 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1400 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1401 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1402 &ip6->ip6_dst) || 1403 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1404 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1405 &ip6->ip6_src))) { 1406 ip6stat.ip6s_badscope++; 1407 continue; 1408 } 1409 1410 mifp->m6_pkt_out++; 1411 mifp->m6_bytes_out += plen; 1412 MC6_SEND(ip6, mifp, m); 1413 } 1414 return 0; 1415 } 1416 1417 static void 1418 phyint_send(ip6, mifp, m) 1419 struct ip6_hdr *ip6; 1420 struct mif6 *mifp; 1421 struct mbuf *m; 1422 { 1423 struct mbuf *mb_copy; 1424 struct ifnet *ifp = mifp->m6_ifp; 1425 int error = 0; 1426 int s = splnet(); 1427 static struct route_in6 ro; 1428 struct in6_multi *in6m; 1429 struct sockaddr_in6 *dst6; 1430 1431 /* 1432 * Make a new reference to the packet; make sure that 1433 * the IPv6 header is actually copied, not just referenced, 1434 * so that ip6_output() only scribbles on the copy. 1435 */ 1436 mb_copy = m_copy(m, 0, M_COPYALL); 1437 if (mb_copy && 1438 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1439 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1440 if (mb_copy == NULL) { 1441 splx(s); 1442 return; 1443 } 1444 /* set MCAST flag to the outgoing packet */ 1445 mb_copy->m_flags |= M_MCAST; 1446 1447 /* 1448 * If we sourced the packet, call ip6_output since we may devide 1449 * the packet into fragments when the packet is too big for the 1450 * outgoing interface. 1451 * Otherwise, we can simply send the packet to the interface 1452 * sending queue. 1453 */ 1454 if (m->m_pkthdr.rcvif == NULL) { 1455 struct ip6_moptions im6o; 1456 1457 im6o.im6o_multicast_ifp = ifp; 1458 /* XXX: ip6_output will override ip6->ip6_hlim */ 1459 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1460 im6o.im6o_multicast_loop = 1; 1461 error = ip6_output(mb_copy, NULL, &ro, 1462 IPV6_FORWARDING, &im6o, NULL); 1463 1464 #ifdef MRT6DEBUG 1465 if (mrt6debug & DEBUG_XMIT) 1466 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1467 mifp - mif6table, error); 1468 #endif 1469 splx(s); 1470 return; 1471 } 1472 1473 /* 1474 * If we belong to the destination multicast group 1475 * on the outgoing interface, loop back a copy. 1476 */ 1477 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1478 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1479 if (in6m != NULL) { 1480 dst6->sin6_len = sizeof(struct sockaddr_in6); 1481 dst6->sin6_family = AF_INET6; 1482 dst6->sin6_addr = ip6->ip6_dst; 1483 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1484 } 1485 /* 1486 * Put the packet into the sending queue of the outgoing interface 1487 * if it would fit in the MTU of the interface. 1488 */ 1489 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1490 dst6->sin6_len = sizeof(struct sockaddr_in6); 1491 dst6->sin6_family = AF_INET6; 1492 dst6->sin6_addr = ip6->ip6_dst; 1493 /* 1494 * We just call if_output instead of nd6_output here, since 1495 * we need no ND for a multicast forwarded packet...right? 1496 */ 1497 error = (*ifp->if_output)(ifp, mb_copy, 1498 (struct sockaddr *)&ro.ro_dst, NULL); 1499 #ifdef MRT6DEBUG 1500 if (mrt6debug & DEBUG_XMIT) 1501 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1502 mifp - mif6table, error); 1503 #endif 1504 } else { 1505 #ifdef MULTICAST_PMTUD 1506 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1507 #else 1508 #ifdef MRT6DEBUG 1509 if (mrt6debug & DEBUG_XMIT) 1510 log(LOG_DEBUG, 1511 "phyint_send: packet too big on %s o %s g %s" 1512 " size %d(discarded)\n", 1513 ifp->if_xname, 1514 ip6_sprintf(&ip6->ip6_src), 1515 ip6_sprintf(&ip6->ip6_dst), 1516 mb_copy->m_pkthdr.len); 1517 #endif /* MRT6DEBUG */ 1518 m_freem(mb_copy); /* simply discard the packet */ 1519 #endif 1520 } 1521 1522 splx(s); 1523 } 1524 1525 static int 1526 register_send(ip6, mif, m) 1527 struct ip6_hdr *ip6; 1528 struct mif6 *mif; 1529 struct mbuf *m; 1530 { 1531 struct mbuf *mm; 1532 int i, len = m->m_pkthdr.len; 1533 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1534 struct mrt6msg *im6; 1535 1536 #ifdef MRT6DEBUG 1537 if (mrt6debug) 1538 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1539 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1540 #endif 1541 ++pim6stat.pim6s_snd_registers; 1542 1543 /* Make a copy of the packet to send to the user level process */ 1544 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1545 if (mm == NULL) 1546 return ENOBUFS; 1547 mm->m_data += max_linkhdr; 1548 mm->m_len = sizeof(struct ip6_hdr); 1549 1550 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1551 m_freem(mm); 1552 return ENOBUFS; 1553 } 1554 i = MHLEN - M_LEADINGSPACE(mm); 1555 if (i > len) 1556 i = len; 1557 mm = m_pullup(mm, i); 1558 if (mm == NULL){ 1559 m_freem(mm); 1560 return ENOBUFS; 1561 } 1562 /* TODO: check it! */ 1563 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1564 1565 /* 1566 * Send message to routing daemon 1567 */ 1568 sin6.sin6_addr = ip6->ip6_src; 1569 1570 im6 = mtod(mm, struct mrt6msg *); 1571 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1572 im6->im6_mbz = 0; 1573 1574 im6->im6_mif = mif - mif6table; 1575 1576 /* iif info is not given for reg. encap.n */ 1577 mrt6stat.mrt6s_upcalls++; 1578 1579 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1580 #ifdef MRT6DEBUG 1581 if (mrt6debug) 1582 log(LOG_WARNING, 1583 "register_send: ip_mrouter socket queue full\n"); 1584 #endif 1585 ++mrt6stat.mrt6s_upq_sockfull; 1586 return ENOBUFS; 1587 } 1588 return 0; 1589 } 1590 1591 /* 1592 * PIM sparse mode hook 1593 * Receives the pim control messages, and passes them up to the listening 1594 * socket, using rip6_input. 1595 * The only message processed is the REGISTER pim message; the pim header 1596 * is stripped off, and the inner packet is passed to register_mforward. 1597 */ 1598 int 1599 pim6_input(mp, offp, proto) 1600 struct mbuf **mp; 1601 int *offp, proto; 1602 { 1603 struct pim *pim; /* pointer to a pim struct */ 1604 struct ip6_hdr *ip6; 1605 int pimlen; 1606 struct mbuf *m = *mp; 1607 int minlen; 1608 int off = *offp; 1609 1610 ++pim6stat.pim6s_rcv_total; 1611 1612 ip6 = mtod(m, struct ip6_hdr *); 1613 pimlen = m->m_pkthdr.len - *offp; 1614 1615 /* 1616 * Validate lengths 1617 */ 1618 if (pimlen < PIM_MINLEN) { 1619 ++pim6stat.pim6s_rcv_tooshort; 1620 #ifdef MRT6DEBUG 1621 if (mrt6debug & DEBUG_PIM) 1622 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1623 #endif 1624 m_freem(m); 1625 return(IPPROTO_DONE); 1626 } 1627 1628 /* 1629 * if the packet is at least as big as a REGISTER, go ahead 1630 * and grab the PIM REGISTER header size, to avoid another 1631 * possible m_pullup() later. 1632 * 1633 * PIM_MINLEN == pimhdr + u_int32 == 8 1634 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1635 */ 1636 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1637 1638 /* 1639 * Make sure that the IP6 and PIM headers in contiguous memory, and 1640 * possibly the PIM REGISTER header 1641 */ 1642 #ifndef PULLDOWN_TEST 1643 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1644 /* adjust pointer */ 1645 ip6 = mtod(m, struct ip6_hdr *); 1646 1647 /* adjust mbuf to point to the PIM header */ 1648 pim = (struct pim *)((caddr_t)ip6 + off); 1649 #else 1650 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1651 if (pim == NULL) { 1652 pim6stat.pim6s_rcv_tooshort++; 1653 return IPPROTO_DONE; 1654 } 1655 #endif 1656 1657 #define PIM6_CHECKSUM 1658 #ifdef PIM6_CHECKSUM 1659 { 1660 int cksumlen; 1661 1662 /* 1663 * Validate checksum. 1664 * If PIM REGISTER, exclude the data packet 1665 */ 1666 if (pim->pim_type == PIM_REGISTER) 1667 cksumlen = PIM_MINLEN; 1668 else 1669 cksumlen = pimlen; 1670 1671 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1672 ++pim6stat.pim6s_rcv_badsum; 1673 #ifdef MRT6DEBUG 1674 if (mrt6debug & DEBUG_PIM) 1675 log(LOG_DEBUG, 1676 "pim6_input: invalid checksum\n"); 1677 #endif 1678 m_freem(m); 1679 return(IPPROTO_DONE); 1680 } 1681 } 1682 #endif /* PIM_CHECKSUM */ 1683 1684 /* PIM version check */ 1685 if (pim->pim_ver != PIM_VERSION) { 1686 ++pim6stat.pim6s_rcv_badversion; 1687 #ifdef MRT6DEBUG 1688 log(LOG_ERR, 1689 "pim6_input: incorrect version %d, expecting %d\n", 1690 pim->pim_ver, PIM_VERSION); 1691 #endif 1692 m_freem(m); 1693 return(IPPROTO_DONE); 1694 } 1695 1696 if (pim->pim_type == PIM_REGISTER) { 1697 /* 1698 * since this is a REGISTER, we'll make a copy of the register 1699 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1700 * routing daemon. 1701 */ 1702 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1703 1704 struct mbuf *mcp; 1705 struct ip6_hdr *eip6; 1706 u_int32_t *reghdr; 1707 int rc; 1708 1709 ++pim6stat.pim6s_rcv_registers; 1710 1711 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1712 #ifdef MRT6DEBUG 1713 if (mrt6debug & DEBUG_PIM) 1714 log(LOG_DEBUG, 1715 "pim6_input: register mif not set: %d\n", 1716 reg_mif_num); 1717 #endif 1718 m_freem(m); 1719 return(IPPROTO_DONE); 1720 } 1721 1722 reghdr = (u_int32_t *)(pim + 1); 1723 1724 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1725 goto pim6_input_to_daemon; 1726 1727 /* 1728 * Validate length 1729 */ 1730 if (pimlen < PIM6_REG_MINLEN) { 1731 ++pim6stat.pim6s_rcv_tooshort; 1732 ++pim6stat.pim6s_rcv_badregisters; 1733 #ifdef MRT6DEBUG 1734 log(LOG_ERR, 1735 "pim6_input: register packet size too " 1736 "small %d from %s\n", 1737 pimlen, ip6_sprintf(&ip6->ip6_src)); 1738 #endif 1739 m_freem(m); 1740 return(IPPROTO_DONE); 1741 } 1742 1743 eip6 = (struct ip6_hdr *) (reghdr + 1); 1744 #ifdef MRT6DEBUG 1745 if (mrt6debug & DEBUG_PIM) 1746 log(LOG_DEBUG, 1747 "pim6_input[register], eip6: %s -> %s, " 1748 "eip6 plen %d\n", 1749 ip6_sprintf(&eip6->ip6_src), 1750 ip6_sprintf(&eip6->ip6_dst), 1751 ntohs(eip6->ip6_plen)); 1752 #endif 1753 1754 /* verify the version number of the inner packet */ 1755 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1756 ++pim6stat.pim6s_rcv_badregisters; 1757 #ifdef MRT6DEBUG 1758 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1759 "of the inner packet\n", 1760 (eip6->ip6_vfc & IPV6_VERSION)); 1761 #endif 1762 m_freem(m); 1763 return(IPPROTO_NONE); 1764 } 1765 1766 /* verify the inner packet is destined to a mcast group */ 1767 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1768 ++pim6stat.pim6s_rcv_badregisters; 1769 #ifdef MRT6DEBUG 1770 if (mrt6debug & DEBUG_PIM) 1771 log(LOG_DEBUG, 1772 "pim6_input: inner packet of register " 1773 "is not multicast %s\n", 1774 ip6_sprintf(&eip6->ip6_dst)); 1775 #endif 1776 m_freem(m); 1777 return(IPPROTO_DONE); 1778 } 1779 1780 /* 1781 * make a copy of the whole header to pass to the daemon later. 1782 */ 1783 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1784 if (mcp == NULL) { 1785 #ifdef MRT6DEBUG 1786 log(LOG_ERR, 1787 "pim6_input: pim register: " 1788 "could not copy register head\n"); 1789 #endif 1790 m_freem(m); 1791 return(IPPROTO_DONE); 1792 } 1793 1794 /* 1795 * forward the inner ip6 packet; point m_data at the inner ip6. 1796 */ 1797 m_adj(m, off + PIM_MINLEN); 1798 #ifdef MRT6DEBUG 1799 if (mrt6debug & DEBUG_PIM) { 1800 log(LOG_DEBUG, 1801 "pim6_input: forwarding decapsulated register: " 1802 "src %s, dst %s, mif %d\n", 1803 ip6_sprintf(&eip6->ip6_src), 1804 ip6_sprintf(&eip6->ip6_dst), 1805 reg_mif_num); 1806 } 1807 #endif 1808 1809 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1810 (struct sockaddr *) &dst, 1811 (struct rtentry *) NULL); 1812 1813 /* prepare the register head to send to the mrouting daemon */ 1814 m = mcp; 1815 } 1816 1817 /* 1818 * Pass the PIM message up to the daemon; if it is a register message 1819 * pass the 'head' only up to the daemon. This includes the 1820 * encapsulator ip6 header, pim header, register header and the 1821 * encapsulated ip6 header. 1822 */ 1823 pim6_input_to_daemon: 1824 rip6_input(&m, offp, proto); 1825 return(IPPROTO_DONE); 1826 } 1827