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sys/netinet6/ip6_mroute.c
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1 /* $FreeBSD: releng/6.0/sys/netinet6/ip6_mroute.c 151730 2005-10-27 14:04:03Z suz $ */ 2 /* $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 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 * 4. 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 "opt_inet.h" 84 #include "opt_inet6.h" 85 86 #include <sys/param.h> 87 #include <sys/callout.h> 88 #include <sys/errno.h> 89 #include <sys/kernel.h> 90 #include <sys/lock.h> 91 #include <sys/malloc.h> 92 #include <sys/mbuf.h> 93 #include <sys/protosw.h> 94 #include <sys/signalvar.h> 95 #include <sys/socket.h> 96 #include <sys/socketvar.h> 97 #include <sys/sockio.h> 98 #include <sys/sx.h> 99 #include <sys/syslog.h> 100 #include <sys/systm.h> 101 #include <sys/time.h> 102 103 #include <net/if.h> 104 #include <net/raw_cb.h> 105 #include <net/route.h> 106 107 #include <netinet/in.h> 108 #include <netinet/in_var.h> 109 110 #include <netinet/ip6.h> 111 #include <netinet6/ip6_var.h> 112 #include <netinet6/nd6.h> 113 #include <netinet6/ip6_mroute.h> 114 #include <netinet6/pim6.h> 115 #include <netinet6/pim6_var.h> 116 117 #include <net/net_osdep.h> 118 119 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry"); 120 121 #define M_HASCL(m) ((m)->m_flags & M_EXT) 122 123 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 124 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 125 126 static int set_pim6 __P((int *)); 127 static int socket_send __P((struct socket *, struct mbuf *, 128 struct sockaddr_in6 *)); 129 static int register_send __P((struct ip6_hdr *, struct mif6 *, 130 struct mbuf *)); 131 132 /* 133 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 134 * except for netstat or debugging purposes. 135 */ 136 struct socket *ip6_mrouter = NULL; 137 int ip6_mrouter_ver = 0; 138 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 139 struct mrt6stat mrt6stat; 140 141 #define NO_RTE_FOUND 0x1 142 #define RTE_FOUND 0x2 143 144 struct mf6c *mf6ctable[MF6CTBLSIZ]; 145 u_char n6expire[MF6CTBLSIZ]; 146 static struct mif6 mif6table[MAXMIFS]; 147 #ifdef MRT6DEBUG 148 u_int mrt6debug = 0; /* debug level */ 149 #define DEBUG_MFC 0x02 150 #define DEBUG_FORWARD 0x04 151 #define DEBUG_EXPIRE 0x08 152 #define DEBUG_XMIT 0x10 153 #define DEBUG_REG 0x20 154 #define DEBUG_PIM 0x40 155 #endif 156 157 static void expire_upcalls __P((void *)); 158 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 159 #define UPCALL_EXPIRE 6 /* number of timeouts */ 160 161 #ifdef INET 162 #ifdef MROUTING 163 extern struct socket *ip_mrouter; 164 #endif 165 #endif 166 167 /* 168 * 'Interfaces' associated with decapsulator (so we can tell 169 * packets that went through it from ones that get reflected 170 * by a broken gateway). These interfaces are never linked into 171 * the system ifnet list & no routes point to them. I.e., packets 172 * can't be sent this way. They only exist as a placeholder for 173 * multicast source verification. 174 */ 175 struct ifnet multicast_register_if6; 176 177 #define ENCAP_HOPS 64 178 179 /* 180 * Private variables. 181 */ 182 static mifi_t nummifs = 0; 183 static mifi_t reg_mif_num = (mifi_t)-1; 184 185 static struct pim6stat pim6stat; 186 static int pim6; 187 188 /* 189 * Hash function for a source, group entry 190 */ 191 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 192 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 193 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 194 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 195 196 /* 197 * Find a route for a given origin IPv6 address and Multicast group address. 198 * Quality of service parameter to be added in the future!!! 199 */ 200 201 #define MF6CFIND(o, g, rt) do { \ 202 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 203 rt = NULL; \ 204 mrt6stat.mrt6s_mfc_lookups++; \ 205 while (_rt) { \ 206 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 207 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 208 (_rt->mf6c_stall == NULL)) { \ 209 rt = _rt; \ 210 break; \ 211 } \ 212 _rt = _rt->mf6c_next; \ 213 } \ 214 if (rt == NULL) { \ 215 mrt6stat.mrt6s_mfc_misses++; \ 216 } \ 217 } while (/*CONSTCOND*/ 0) 218 219 /* 220 * Macros to compute elapsed time efficiently 221 * Borrowed from Van Jacobson's scheduling code 222 */ 223 #define TV_DELTA(a, b, delta) do { \ 224 int xxs; \ 225 \ 226 delta = (a).tv_usec - (b).tv_usec; \ 227 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 228 switch (xxs) { \ 229 case 2: \ 230 delta += 1000000; \ 231 /* FALLTHROUGH */ \ 232 case 1: \ 233 delta += 1000000; \ 234 break; \ 235 default: \ 236 delta += (1000000 * xxs); \ 237 } \ 238 } \ 239 } while (/*CONSTCOND*/ 0) 240 241 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 242 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 243 244 #ifdef UPCALL_TIMING 245 #define UPCALL_MAX 50 246 u_long upcall_data[UPCALL_MAX + 1]; 247 static void collate(); 248 #endif /* UPCALL_TIMING */ 249 250 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 251 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 252 static int ip6_mrouter_init __P((struct socket *, int, int)); 253 static int add_m6if __P((struct mif6ctl *)); 254 static int del_m6if __P((mifi_t *)); 255 static int add_m6fc __P((struct mf6cctl *)); 256 static int del_m6fc __P((struct mf6cctl *)); 257 258 static struct callout expire_upcalls_ch; 259 260 /* 261 * Handle MRT setsockopt commands to modify the multicast routing tables. 262 */ 263 int 264 ip6_mrouter_set(so, sopt) 265 struct socket *so; 266 struct sockopt *sopt; 267 { 268 int error = 0; 269 int optval; 270 struct mif6ctl mifc; 271 struct mf6cctl mfcc; 272 mifi_t mifi; 273 274 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 275 return (EACCES); 276 277 switch (sopt->sopt_name) { 278 case MRT6_INIT: 279 #ifdef MRT6_OINIT 280 case MRT6_OINIT: 281 #endif 282 error = sooptcopyin(sopt, &optval, sizeof(optval), 283 sizeof(optval)); 284 if (error) 285 break; 286 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 287 break; 288 case MRT6_DONE: 289 error = ip6_mrouter_done(); 290 break; 291 case MRT6_ADD_MIF: 292 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 293 if (error) 294 break; 295 error = add_m6if(&mifc); 296 break; 297 case MRT6_ADD_MFC: 298 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 299 if (error) 300 break; 301 error = add_m6fc(&mfcc); 302 break; 303 case MRT6_DEL_MFC: 304 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 305 if (error) 306 break; 307 error = del_m6fc(&mfcc); 308 break; 309 case MRT6_DEL_MIF: 310 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 311 if (error) 312 break; 313 error = del_m6if(&mifi); 314 break; 315 case MRT6_PIM: 316 error = sooptcopyin(sopt, &optval, sizeof(optval), 317 sizeof(optval)); 318 if (error) 319 break; 320 error = set_pim6(&optval); 321 break; 322 default: 323 error = EOPNOTSUPP; 324 break; 325 } 326 327 return (error); 328 } 329 330 /* 331 * Handle MRT getsockopt commands 332 */ 333 int 334 ip6_mrouter_get(so, sopt) 335 struct socket *so; 336 struct sockopt *sopt; 337 { 338 int error = 0; 339 340 if (so != ip6_mrouter) 341 return (EACCES); 342 343 switch (sopt->sopt_name) { 344 case MRT6_PIM: 345 error = sooptcopyout(sopt, &pim6, sizeof(pim6)); 346 break; 347 } 348 return (error); 349 } 350 351 /* 352 * Handle ioctl commands to obtain information from the cache 353 */ 354 int 355 mrt6_ioctl(cmd, data) 356 int cmd; 357 caddr_t data; 358 { 359 switch (cmd) { 360 case SIOCGETSGCNT_IN6: 361 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 362 case SIOCGETMIFCNT_IN6: 363 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 364 default: 365 return (EINVAL); 366 } 367 } 368 369 /* 370 * returns the packet, byte, rpf-failure count for the source group provided 371 */ 372 static int 373 get_sg_cnt(req) 374 struct sioc_sg_req6 *req; 375 { 376 struct mf6c *rt; 377 int s; 378 379 s = splnet(); 380 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 381 splx(s); 382 if (rt != NULL) { 383 req->pktcnt = rt->mf6c_pkt_cnt; 384 req->bytecnt = rt->mf6c_byte_cnt; 385 req->wrong_if = rt->mf6c_wrong_if; 386 } else 387 return (ESRCH); 388 #if 0 389 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 390 #endif 391 392 return (0); 393 } 394 395 /* 396 * returns the input and output packet and byte counts on the mif provided 397 */ 398 static int 399 get_mif6_cnt(req) 400 struct sioc_mif_req6 *req; 401 { 402 mifi_t mifi = req->mifi; 403 404 if (mifi >= nummifs) 405 return (EINVAL); 406 407 req->icount = mif6table[mifi].m6_pkt_in; 408 req->ocount = mif6table[mifi].m6_pkt_out; 409 req->ibytes = mif6table[mifi].m6_bytes_in; 410 req->obytes = mif6table[mifi].m6_bytes_out; 411 412 return (0); 413 } 414 415 static int 416 set_pim6(i) 417 int *i; 418 { 419 if ((*i != 1) && (*i != 0)) 420 return (EINVAL); 421 422 pim6 = *i; 423 424 return (0); 425 } 426 427 /* 428 * Enable multicast routing 429 */ 430 static int 431 ip6_mrouter_init(so, v, cmd) 432 struct socket *so; 433 int v; 434 int cmd; 435 { 436 #ifdef MRT6DEBUG 437 if (mrt6debug) 438 log(LOG_DEBUG, 439 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 440 so->so_type, so->so_proto->pr_protocol); 441 #endif 442 443 if (so->so_type != SOCK_RAW || 444 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 445 return (EOPNOTSUPP); 446 447 if (v != 1) 448 return (ENOPROTOOPT); 449 450 if (ip6_mrouter != NULL) 451 return (EADDRINUSE); 452 453 ip6_mrouter = so; 454 ip6_mrouter_ver = cmd; 455 456 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 457 bzero((caddr_t)n6expire, sizeof(n6expire)); 458 459 pim6 = 0;/* used for stubbing out/in pim stuff */ 460 461 callout_init(&expire_upcalls_ch, 0); 462 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 463 expire_upcalls, NULL); 464 465 #ifdef MRT6DEBUG 466 if (mrt6debug) 467 log(LOG_DEBUG, "ip6_mrouter_init\n"); 468 #endif 469 470 return (0); 471 } 472 473 /* 474 * Disable multicast routing 475 */ 476 int 477 ip6_mrouter_done() 478 { 479 mifi_t mifi; 480 int i; 481 struct ifnet *ifp; 482 struct in6_ifreq ifr; 483 struct mf6c *rt; 484 struct rtdetq *rte; 485 int s; 486 487 s = splnet(); 488 489 /* 490 * For each phyint in use, disable promiscuous reception of all IPv6 491 * multicasts. 492 */ 493 #ifdef INET 494 #ifdef MROUTING 495 /* 496 * If there is still IPv4 multicast routing daemon, 497 * we remain interfaces to receive all muliticasted packets. 498 * XXX: there may be an interface in which the IPv4 multicast 499 * daemon is not interested... 500 */ 501 if (!ip_mrouter) 502 #endif 503 #endif 504 { 505 for (mifi = 0; mifi < nummifs; mifi++) { 506 if (mif6table[mifi].m6_ifp && 507 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 508 ifr.ifr_addr.sin6_family = AF_INET6; 509 ifr.ifr_addr.sin6_addr = in6addr_any; 510 ifp = mif6table[mifi].m6_ifp; 511 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 512 (caddr_t)&ifr); 513 } 514 } 515 } 516 #ifdef notyet 517 bzero((caddr_t)qtable, sizeof(qtable)); 518 bzero((caddr_t)tbftable, sizeof(tbftable)); 519 #endif 520 bzero((caddr_t)mif6table, sizeof(mif6table)); 521 nummifs = 0; 522 523 pim6 = 0; /* used to stub out/in pim specific code */ 524 525 callout_stop(&expire_upcalls_ch); 526 527 /* 528 * Free all multicast forwarding cache entries. 529 */ 530 for (i = 0; i < MF6CTBLSIZ; i++) { 531 rt = mf6ctable[i]; 532 while (rt) { 533 struct mf6c *frt; 534 535 for (rte = rt->mf6c_stall; rte != NULL; ) { 536 struct rtdetq *n = rte->next; 537 538 m_free(rte->m); 539 free(rte, M_MRTABLE); 540 rte = n; 541 } 542 frt = rt; 543 rt = rt->mf6c_next; 544 free(frt, M_MRTABLE); 545 } 546 } 547 548 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 549 550 /* 551 * Reset register interface 552 */ 553 if (reg_mif_num != (mifi_t)-1) { 554 if_detach(&multicast_register_if6); 555 reg_mif_num = (mifi_t)-1; 556 } 557 558 ip6_mrouter = NULL; 559 ip6_mrouter_ver = 0; 560 561 splx(s); 562 563 #ifdef MRT6DEBUG 564 if (mrt6debug) 565 log(LOG_DEBUG, "ip6_mrouter_done\n"); 566 #endif 567 568 return (0); 569 } 570 571 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 572 573 /* 574 * Add a mif to the mif table 575 */ 576 static int 577 add_m6if(mifcp) 578 struct mif6ctl *mifcp; 579 { 580 struct mif6 *mifp; 581 struct ifnet *ifp; 582 int error, s; 583 #ifdef notyet 584 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 585 #endif 586 587 if (mifcp->mif6c_mifi >= MAXMIFS) 588 return (EINVAL); 589 mifp = mif6table + mifcp->mif6c_mifi; 590 if (mifp->m6_ifp) 591 return (EADDRINUSE); /* XXX: is it appropriate? */ 592 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 593 return (ENXIO); 594 ifp = ifnet_byindex(mifcp->mif6c_pifi); 595 596 if (mifcp->mif6c_flags & MIFF_REGISTER) { 597 ifp = &multicast_register_if6; 598 599 if (reg_mif_num == (mifi_t)-1) { 600 if_initname(ifp, "register_mif", 0); 601 ifp->if_flags |= IFF_LOOPBACK; 602 ifp->if_index = mifcp->mif6c_mifi; 603 reg_mif_num = mifcp->mif6c_mifi; 604 if_attach(ifp); 605 } 606 607 } /* if REGISTER */ 608 else { 609 /* Make sure the interface supports multicast */ 610 if ((ifp->if_flags & IFF_MULTICAST) == 0) 611 return (EOPNOTSUPP); 612 613 s = splnet(); 614 error = if_allmulti(ifp, 1); 615 splx(s); 616 if (error) 617 return (error); 618 } 619 620 s = splnet(); 621 mifp->m6_flags = mifcp->mif6c_flags; 622 mifp->m6_ifp = ifp; 623 #ifdef notyet 624 /* scaling up here allows division by 1024 in critical code */ 625 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 626 #endif 627 /* initialize per mif pkt counters */ 628 mifp->m6_pkt_in = 0; 629 mifp->m6_pkt_out = 0; 630 mifp->m6_bytes_in = 0; 631 mifp->m6_bytes_out = 0; 632 splx(s); 633 634 /* Adjust nummifs up if the mifi is higher than nummifs */ 635 if (nummifs <= mifcp->mif6c_mifi) 636 nummifs = mifcp->mif6c_mifi + 1; 637 638 #ifdef MRT6DEBUG 639 if (mrt6debug) 640 log(LOG_DEBUG, 641 "add_mif #%d, phyint %s\n", 642 mifcp->mif6c_mifi, 643 ifp->if_xname); 644 #endif 645 646 return (0); 647 } 648 649 /* 650 * Delete a mif from the mif table 651 */ 652 static int 653 del_m6if(mifip) 654 mifi_t *mifip; 655 { 656 struct mif6 *mifp = mif6table + *mifip; 657 mifi_t mifi; 658 struct ifnet *ifp; 659 int s; 660 661 if (*mifip >= nummifs) 662 return (EINVAL); 663 if (mifp->m6_ifp == NULL) 664 return (EINVAL); 665 666 s = splnet(); 667 668 if (!(mifp->m6_flags & MIFF_REGISTER)) { 669 /* 670 * XXX: what if there is yet IPv4 multicast daemon 671 * using the interface? 672 */ 673 ifp = mifp->m6_ifp; 674 675 if_allmulti(ifp, 0); 676 } else { 677 if (reg_mif_num != (mifi_t)-1) { 678 if_detach(&multicast_register_if6); 679 reg_mif_num = (mifi_t)-1; 680 } 681 } 682 683 #ifdef notyet 684 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 685 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 686 #endif 687 bzero((caddr_t)mifp, sizeof(*mifp)); 688 689 /* Adjust nummifs down */ 690 for (mifi = nummifs; mifi > 0; mifi--) 691 if (mif6table[mifi - 1].m6_ifp) 692 break; 693 nummifs = mifi; 694 695 splx(s); 696 697 #ifdef MRT6DEBUG 698 if (mrt6debug) 699 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 700 #endif 701 702 return (0); 703 } 704 705 /* 706 * Add an mfc entry 707 */ 708 static int 709 add_m6fc(mfccp) 710 struct mf6cctl *mfccp; 711 { 712 struct mf6c *rt; 713 u_long hash; 714 struct rtdetq *rte; 715 u_short nstl; 716 int s; 717 718 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 719 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 720 721 /* If an entry already exists, just update the fields */ 722 if (rt) { 723 #ifdef MRT6DEBUG 724 if (mrt6debug & DEBUG_MFC) 725 log(LOG_DEBUG, 726 "add_m6fc no upcall h %d o %s g %s p %x\n", 727 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 728 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 729 mfccp->mf6cc_parent); 730 #endif 731 732 s = splnet(); 733 rt->mf6c_parent = mfccp->mf6cc_parent; 734 rt->mf6c_ifset = mfccp->mf6cc_ifset; 735 splx(s); 736 return (0); 737 } 738 739 /* 740 * Find the entry for which the upcall was made and update 741 */ 742 s = splnet(); 743 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 744 mfccp->mf6cc_mcastgrp.sin6_addr); 745 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 746 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 747 &mfccp->mf6cc_origin.sin6_addr) && 748 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 749 &mfccp->mf6cc_mcastgrp.sin6_addr) && 750 (rt->mf6c_stall != NULL)) { 751 752 if (nstl++) 753 log(LOG_ERR, 754 "add_m6fc: %s o %s g %s p %x dbx %p\n", 755 "multiple kernel entries", 756 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 757 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 758 mfccp->mf6cc_parent, rt->mf6c_stall); 759 760 #ifdef MRT6DEBUG 761 if (mrt6debug & DEBUG_MFC) 762 log(LOG_DEBUG, 763 "add_m6fc o %s g %s p %x dbg %x\n", 764 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 765 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 766 mfccp->mf6cc_parent, rt->mf6c_stall); 767 #endif 768 769 rt->mf6c_origin = mfccp->mf6cc_origin; 770 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 771 rt->mf6c_parent = mfccp->mf6cc_parent; 772 rt->mf6c_ifset = mfccp->mf6cc_ifset; 773 /* initialize pkt counters per src-grp */ 774 rt->mf6c_pkt_cnt = 0; 775 rt->mf6c_byte_cnt = 0; 776 rt->mf6c_wrong_if = 0; 777 778 rt->mf6c_expire = 0; /* Don't clean this guy up */ 779 n6expire[hash]--; 780 781 /* free packets Qed at the end of this entry */ 782 for (rte = rt->mf6c_stall; rte != NULL; ) { 783 struct rtdetq *n = rte->next; 784 ip6_mdq(rte->m, rte->ifp, rt); 785 m_freem(rte->m); 786 #ifdef UPCALL_TIMING 787 collate(&(rte->t)); 788 #endif /* UPCALL_TIMING */ 789 free(rte, M_MRTABLE); 790 rte = n; 791 } 792 rt->mf6c_stall = NULL; 793 } 794 } 795 796 /* 797 * It is possible that an entry is being inserted without an upcall 798 */ 799 if (nstl == 0) { 800 #ifdef MRT6DEBUG 801 if (mrt6debug & DEBUG_MFC) 802 log(LOG_DEBUG, 803 "add_mfc no upcall h %d o %s g %s p %x\n", 804 hash, 805 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 806 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 807 mfccp->mf6cc_parent); 808 #endif 809 810 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 811 812 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 813 &mfccp->mf6cc_origin.sin6_addr)&& 814 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 815 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 816 817 rt->mf6c_origin = mfccp->mf6cc_origin; 818 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 819 rt->mf6c_parent = mfccp->mf6cc_parent; 820 rt->mf6c_ifset = mfccp->mf6cc_ifset; 821 /* initialize pkt counters per src-grp */ 822 rt->mf6c_pkt_cnt = 0; 823 rt->mf6c_byte_cnt = 0; 824 rt->mf6c_wrong_if = 0; 825 826 if (rt->mf6c_expire) 827 n6expire[hash]--; 828 rt->mf6c_expire = 0; 829 } 830 } 831 if (rt == NULL) { 832 /* no upcall, so make a new entry */ 833 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 834 M_NOWAIT); 835 if (rt == NULL) { 836 splx(s); 837 return (ENOBUFS); 838 } 839 840 /* insert new entry at head of hash chain */ 841 rt->mf6c_origin = mfccp->mf6cc_origin; 842 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 843 rt->mf6c_parent = mfccp->mf6cc_parent; 844 rt->mf6c_ifset = mfccp->mf6cc_ifset; 845 /* initialize pkt counters per src-grp */ 846 rt->mf6c_pkt_cnt = 0; 847 rt->mf6c_byte_cnt = 0; 848 rt->mf6c_wrong_if = 0; 849 rt->mf6c_expire = 0; 850 rt->mf6c_stall = NULL; 851 852 /* link into table */ 853 rt->mf6c_next = mf6ctable[hash]; 854 mf6ctable[hash] = rt; 855 } 856 } 857 splx(s); 858 return (0); 859 } 860 861 #ifdef UPCALL_TIMING 862 /* 863 * collect delay statistics on the upcalls 864 */ 865 static void 866 collate(t) 867 struct timeval *t; 868 { 869 u_long d; 870 struct timeval tp; 871 u_long delta; 872 873 GET_TIME(tp); 874 875 if (TV_LT(*t, tp)) 876 { 877 TV_DELTA(tp, *t, delta); 878 879 d = delta >> 10; 880 if (d > UPCALL_MAX) 881 d = UPCALL_MAX; 882 883 ++upcall_data[d]; 884 } 885 } 886 #endif /* UPCALL_TIMING */ 887 888 /* 889 * Delete an mfc entry 890 */ 891 static int 892 del_m6fc(mfccp) 893 struct mf6cctl *mfccp; 894 { 895 struct sockaddr_in6 origin; 896 struct sockaddr_in6 mcastgrp; 897 struct mf6c *rt; 898 struct mf6c **nptr; 899 u_long hash; 900 int s; 901 902 origin = mfccp->mf6cc_origin; 903 mcastgrp = mfccp->mf6cc_mcastgrp; 904 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 905 906 #ifdef MRT6DEBUG 907 if (mrt6debug & DEBUG_MFC) 908 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 909 ip6_sprintf(&origin.sin6_addr), 910 ip6_sprintf(&mcastgrp.sin6_addr)); 911 #endif 912 913 s = splnet(); 914 915 nptr = &mf6ctable[hash]; 916 while ((rt = *nptr) != NULL) { 917 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 918 &rt->mf6c_origin.sin6_addr) && 919 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 920 &rt->mf6c_mcastgrp.sin6_addr) && 921 rt->mf6c_stall == NULL) 922 break; 923 924 nptr = &rt->mf6c_next; 925 } 926 if (rt == NULL) { 927 splx(s); 928 return (EADDRNOTAVAIL); 929 } 930 931 *nptr = rt->mf6c_next; 932 free(rt, M_MRTABLE); 933 934 splx(s); 935 936 return (0); 937 } 938 939 static int 940 socket_send(s, mm, src) 941 struct socket *s; 942 struct mbuf *mm; 943 struct sockaddr_in6 *src; 944 { 945 if (s) { 946 if (sbappendaddr(&s->so_rcv, 947 (struct sockaddr *)src, 948 mm, (struct mbuf *)0) != 0) { 949 sorwakeup(s); 950 return (0); 951 } 952 } 953 m_freem(mm); 954 return (-1); 955 } 956 957 /* 958 * IPv6 multicast forwarding function. This function assumes that the packet 959 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 960 * pointed to by "ifp", and the packet is to be relayed to other networks 961 * that have members of the packet's destination IPv6 multicast group. 962 * 963 * The packet is returned unscathed to the caller, unless it is 964 * erroneous, in which case a non-zero return value tells the caller to 965 * discard it. 966 */ 967 968 int 969 ip6_mforward(ip6, ifp, m) 970 struct ip6_hdr *ip6; 971 struct ifnet *ifp; 972 struct mbuf *m; 973 { 974 struct mf6c *rt; 975 struct mif6 *mifp; 976 struct mbuf *mm; 977 int s; 978 mifi_t mifi; 979 980 #ifdef MRT6DEBUG 981 if (mrt6debug & DEBUG_FORWARD) 982 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 983 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 984 ifp->if_index); 985 #endif 986 987 /* 988 * Don't forward a packet with Hop limit of zero or one, 989 * or a packet destined to a local-only group. 990 */ 991 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 992 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 993 return (0); 994 ip6->ip6_hlim--; 995 996 /* 997 * Source address check: do not forward packets with unspecified 998 * source. It was discussed in July 2000, on ipngwg mailing list. 999 * This is rather more serious than unicast cases, because some 1000 * MLD packets can be sent with the unspecified source address 1001 * (although such packets must normally set 1 to the hop limit field). 1002 */ 1003 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1004 ip6stat.ip6s_cantforward++; 1005 if (ip6_log_time + ip6_log_interval < time_second) { 1006 ip6_log_time = time_second; 1007 log(LOG_DEBUG, 1008 "cannot forward " 1009 "from %s to %s nxt %d received on %s\n", 1010 ip6_sprintf(&ip6->ip6_src), 1011 ip6_sprintf(&ip6->ip6_dst), 1012 ip6->ip6_nxt, 1013 if_name(m->m_pkthdr.rcvif)); 1014 } 1015 return (0); 1016 } 1017 1018 /* 1019 * Determine forwarding mifs from the forwarding cache table 1020 */ 1021 s = splnet(); 1022 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1023 1024 /* Entry exists, so forward if necessary */ 1025 if (rt) { 1026 splx(s); 1027 return (ip6_mdq(m, ifp, rt)); 1028 } else { 1029 /* 1030 * If we don't have a route for packet's origin, 1031 * Make a copy of the packet & 1032 * send message to routing daemon 1033 */ 1034 1035 struct mbuf *mb0; 1036 struct rtdetq *rte; 1037 u_long hash; 1038 /* int i, npkts;*/ 1039 #ifdef UPCALL_TIMING 1040 struct timeval tp; 1041 1042 GET_TIME(tp); 1043 #endif /* UPCALL_TIMING */ 1044 1045 mrt6stat.mrt6s_no_route++; 1046 #ifdef MRT6DEBUG 1047 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1048 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1049 ip6_sprintf(&ip6->ip6_src), 1050 ip6_sprintf(&ip6->ip6_dst)); 1051 #endif 1052 1053 /* 1054 * Allocate mbufs early so that we don't do extra work if we 1055 * are just going to fail anyway. 1056 */ 1057 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1058 M_NOWAIT); 1059 if (rte == NULL) { 1060 splx(s); 1061 return (ENOBUFS); 1062 } 1063 mb0 = m_copy(m, 0, M_COPYALL); 1064 /* 1065 * Pullup packet header if needed before storing it, 1066 * as other references may modify it in the meantime. 1067 */ 1068 if (mb0 && 1069 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1070 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1071 if (mb0 == NULL) { 1072 free(rte, M_MRTABLE); 1073 splx(s); 1074 return (ENOBUFS); 1075 } 1076 1077 /* is there an upcall waiting for this packet? */ 1078 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1079 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1080 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1081 &rt->mf6c_origin.sin6_addr) && 1082 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1083 &rt->mf6c_mcastgrp.sin6_addr) && 1084 (rt->mf6c_stall != NULL)) 1085 break; 1086 } 1087 1088 if (rt == NULL) { 1089 struct mrt6msg *im; 1090 #ifdef MRT6_OINIT 1091 struct omrt6msg *oim; 1092 #endif 1093 1094 /* no upcall, so make a new entry */ 1095 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1096 M_NOWAIT); 1097 if (rt == NULL) { 1098 free(rte, M_MRTABLE); 1099 m_freem(mb0); 1100 splx(s); 1101 return (ENOBUFS); 1102 } 1103 /* 1104 * Make a copy of the header to send to the user 1105 * level process 1106 */ 1107 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1108 1109 if (mm == NULL) { 1110 free(rte, M_MRTABLE); 1111 m_freem(mb0); 1112 free(rt, M_MRTABLE); 1113 splx(s); 1114 return (ENOBUFS); 1115 } 1116 1117 /* 1118 * Send message to routing daemon 1119 */ 1120 sin6.sin6_addr = ip6->ip6_src; 1121 1122 im = NULL; 1123 #ifdef MRT6_OINIT 1124 oim = NULL; 1125 #endif 1126 switch (ip6_mrouter_ver) { 1127 #ifdef MRT6_OINIT 1128 case MRT6_OINIT: 1129 oim = mtod(mm, struct omrt6msg *); 1130 oim->im6_msgtype = MRT6MSG_NOCACHE; 1131 oim->im6_mbz = 0; 1132 break; 1133 #endif 1134 case MRT6_INIT: 1135 im = mtod(mm, struct mrt6msg *); 1136 im->im6_msgtype = MRT6MSG_NOCACHE; 1137 im->im6_mbz = 0; 1138 break; 1139 default: 1140 free(rte, M_MRTABLE); 1141 m_freem(mb0); 1142 free(rt, M_MRTABLE); 1143 splx(s); 1144 return (EINVAL); 1145 } 1146 1147 #ifdef MRT6DEBUG 1148 if (mrt6debug & DEBUG_FORWARD) 1149 log(LOG_DEBUG, 1150 "getting the iif info in the kernel\n"); 1151 #endif 1152 1153 for (mifp = mif6table, mifi = 0; 1154 mifi < nummifs && mifp->m6_ifp != ifp; 1155 mifp++, mifi++) 1156 ; 1157 1158 switch (ip6_mrouter_ver) { 1159 #ifdef MRT6_OINIT 1160 case MRT6_OINIT: 1161 oim->im6_mif = mifi; 1162 break; 1163 #endif 1164 case MRT6_INIT: 1165 im->im6_mif = mifi; 1166 break; 1167 } 1168 1169 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1170 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1171 "socket queue full\n"); 1172 mrt6stat.mrt6s_upq_sockfull++; 1173 free(rte, M_MRTABLE); 1174 m_freem(mb0); 1175 free(rt, M_MRTABLE); 1176 splx(s); 1177 return (ENOBUFS); 1178 } 1179 1180 mrt6stat.mrt6s_upcalls++; 1181 1182 /* insert new entry at head of hash chain */ 1183 bzero(rt, sizeof(*rt)); 1184 rt->mf6c_origin.sin6_family = AF_INET6; 1185 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1186 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1187 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1188 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1189 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1190 rt->mf6c_expire = UPCALL_EXPIRE; 1191 n6expire[hash]++; 1192 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1193 1194 /* link into table */ 1195 rt->mf6c_next = mf6ctable[hash]; 1196 mf6ctable[hash] = rt; 1197 /* Add this entry to the end of the queue */ 1198 rt->mf6c_stall = rte; 1199 } else { 1200 /* determine if q has overflowed */ 1201 struct rtdetq **p; 1202 int npkts = 0; 1203 1204 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1205 if (++npkts > MAX_UPQ6) { 1206 mrt6stat.mrt6s_upq_ovflw++; 1207 free(rte, M_MRTABLE); 1208 m_freem(mb0); 1209 splx(s); 1210 return (0); 1211 } 1212 1213 /* Add this entry to the end of the queue */ 1214 *p = rte; 1215 } 1216 1217 rte->next = NULL; 1218 rte->m = mb0; 1219 rte->ifp = ifp; 1220 #ifdef UPCALL_TIMING 1221 rte->t = tp; 1222 #endif /* UPCALL_TIMING */ 1223 1224 splx(s); 1225 1226 return (0); 1227 } 1228 } 1229 1230 /* 1231 * Clean up cache entries if upcalls are not serviced 1232 * Call from the Slow Timeout mechanism, every half second. 1233 */ 1234 static void 1235 expire_upcalls(unused) 1236 void *unused; 1237 { 1238 struct rtdetq *rte; 1239 struct mf6c *mfc, **nptr; 1240 int i; 1241 int s; 1242 1243 s = splnet(); 1244 for (i = 0; i < MF6CTBLSIZ; i++) { 1245 if (n6expire[i] == 0) 1246 continue; 1247 nptr = &mf6ctable[i]; 1248 while ((mfc = *nptr) != NULL) { 1249 rte = mfc->mf6c_stall; 1250 /* 1251 * Skip real cache entries 1252 * Make sure it wasn't marked to not expire (shouldn't happen) 1253 * If it expires now 1254 */ 1255 if (rte != NULL && 1256 mfc->mf6c_expire != 0 && 1257 --mfc->mf6c_expire == 0) { 1258 #ifdef MRT6DEBUG 1259 if (mrt6debug & DEBUG_EXPIRE) 1260 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1261 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1262 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1263 #endif 1264 /* 1265 * drop all the packets 1266 * free the mbuf with the pkt, if, timing info 1267 */ 1268 do { 1269 struct rtdetq *n = rte->next; 1270 m_freem(rte->m); 1271 free(rte, M_MRTABLE); 1272 rte = n; 1273 } while (rte != NULL); 1274 mrt6stat.mrt6s_cache_cleanups++; 1275 n6expire[i]--; 1276 1277 *nptr = mfc->mf6c_next; 1278 free(mfc, M_MRTABLE); 1279 } else { 1280 nptr = &mfc->mf6c_next; 1281 } 1282 } 1283 } 1284 splx(s); 1285 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1286 expire_upcalls, NULL); 1287 } 1288 1289 /* 1290 * Packet forwarding routine once entry in the cache is made 1291 */ 1292 static int 1293 ip6_mdq(m, ifp, rt) 1294 struct mbuf *m; 1295 struct ifnet *ifp; 1296 struct mf6c *rt; 1297 { 1298 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1299 mifi_t mifi, iif; 1300 struct mif6 *mifp; 1301 int plen = m->m_pkthdr.len; 1302 u_int32_t dscopein, sscopein; 1303 1304 /* 1305 * Macro to send packet on mif. Since RSVP packets don't get counted on 1306 * input, they shouldn't get counted on output, so statistics keeping is 1307 * separate. 1308 */ 1309 1310 #define MC6_SEND(ip6, mifp, m) do { \ 1311 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1312 register_send((ip6), (mifp), (m)); \ 1313 else \ 1314 phyint_send((ip6), (mifp), (m)); \ 1315 } while (/*CONSTCOND*/ 0) 1316 1317 /* 1318 * Don't forward if it didn't arrive from the parent mif 1319 * for its origin. 1320 */ 1321 mifi = rt->mf6c_parent; 1322 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1323 /* came in the wrong interface */ 1324 #ifdef MRT6DEBUG 1325 if (mrt6debug & DEBUG_FORWARD) 1326 log(LOG_DEBUG, 1327 "wrong if: ifid %d mifi %d mififid %x\n", 1328 ifp->if_index, mifi, 1329 mif6table[mifi].m6_ifp->if_index); 1330 #endif 1331 mrt6stat.mrt6s_wrong_if++; 1332 rt->mf6c_wrong_if++; 1333 /* 1334 * If we are doing PIM processing, and we are forwarding 1335 * packets on this interface, send a message to the 1336 * routing daemon. 1337 */ 1338 /* have to make sure this is a valid mif */ 1339 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1340 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1341 /* 1342 * Check the M_LOOP flag to avoid an 1343 * unnecessary PIM assert. 1344 * XXX: M_LOOP is an ad-hoc hack... 1345 */ 1346 static struct sockaddr_in6 sin6 = 1347 { sizeof(sin6), AF_INET6 }; 1348 1349 struct mbuf *mm; 1350 struct mrt6msg *im; 1351 #ifdef MRT6_OINIT 1352 struct omrt6msg *oim; 1353 #endif 1354 1355 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1356 if (mm && 1357 (M_HASCL(mm) || 1358 mm->m_len < sizeof(struct ip6_hdr))) 1359 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1360 if (mm == NULL) 1361 return (ENOBUFS); 1362 1363 #ifdef MRT6_OINIT 1364 oim = NULL; 1365 #endif 1366 im = NULL; 1367 switch (ip6_mrouter_ver) { 1368 #ifdef MRT6_OINIT 1369 case MRT6_OINIT: 1370 oim = mtod(mm, struct omrt6msg *); 1371 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1372 oim->im6_mbz = 0; 1373 break; 1374 #endif 1375 case MRT6_INIT: 1376 im = mtod(mm, struct mrt6msg *); 1377 im->im6_msgtype = MRT6MSG_WRONGMIF; 1378 im->im6_mbz = 0; 1379 break; 1380 default: 1381 m_freem(mm); 1382 return (EINVAL); 1383 } 1384 1385 for (mifp = mif6table, iif = 0; 1386 iif < nummifs && mifp && 1387 mifp->m6_ifp != ifp; 1388 mifp++, iif++) 1389 ; 1390 1391 switch (ip6_mrouter_ver) { 1392 #ifdef MRT6_OINIT 1393 case MRT6_OINIT: 1394 oim->im6_mif = iif; 1395 sin6.sin6_addr = oim->im6_src; 1396 break; 1397 #endif 1398 case MRT6_INIT: 1399 im->im6_mif = iif; 1400 sin6.sin6_addr = im->im6_src; 1401 break; 1402 } 1403 1404 mrt6stat.mrt6s_upcalls++; 1405 1406 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1407 #ifdef MRT6DEBUG 1408 if (mrt6debug) 1409 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1410 #endif 1411 ++mrt6stat.mrt6s_upq_sockfull; 1412 return (ENOBUFS); 1413 } /* if socket Q full */ 1414 } /* if PIM */ 1415 return (0); 1416 } /* if wrong iif */ 1417 1418 /* If I sourced this packet, it counts as output, else it was input. */ 1419 if (m->m_pkthdr.rcvif == NULL) { 1420 /* XXX: is rcvif really NULL when output?? */ 1421 mif6table[mifi].m6_pkt_out++; 1422 mif6table[mifi].m6_bytes_out += plen; 1423 } else { 1424 mif6table[mifi].m6_pkt_in++; 1425 mif6table[mifi].m6_bytes_in += plen; 1426 } 1427 rt->mf6c_pkt_cnt++; 1428 rt->mf6c_byte_cnt += plen; 1429 1430 /* 1431 * For each mif, forward a copy of the packet if there are group 1432 * members downstream on the interface. 1433 */ 1434 if (in6_addr2zoneid(ifp, &ip6->ip6_dst, &dscopein) || 1435 in6_addr2zoneid(ifp, &ip6->ip6_src, &sscopein)) 1436 return (EINVAL); 1437 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1438 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1439 u_int32_t dscopeout, sscopeout; 1440 1441 /* 1442 * check if the outgoing packet is going to break 1443 * a scope boundary. 1444 * XXX For packets through PIM register tunnel 1445 * interface, we believe a routing daemon. 1446 */ 1447 if (!(mif6table[rt->mf6c_parent].m6_flags & 1448 MIFF_REGISTER) && 1449 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1450 if (in6_addr2zoneid(mif6table[mifi].m6_ifp, 1451 &ip6->ip6_dst, 1452 &dscopeout) || 1453 in6_addr2zoneid(mif6table[mifi].m6_ifp, 1454 &ip6->ip6_src, 1455 &sscopeout) || 1456 dscopein != dscopeout || 1457 sscopein != sscopeout) { 1458 ip6stat.ip6s_badscope++; 1459 continue; 1460 } 1461 } 1462 1463 mifp->m6_pkt_out++; 1464 mifp->m6_bytes_out += plen; 1465 MC6_SEND(ip6, mifp, m); 1466 } 1467 } 1468 return (0); 1469 } 1470 1471 static void 1472 phyint_send(ip6, mifp, m) 1473 struct ip6_hdr *ip6; 1474 struct mif6 *mifp; 1475 struct mbuf *m; 1476 { 1477 struct mbuf *mb_copy; 1478 struct ifnet *ifp = mifp->m6_ifp; 1479 int error = 0; 1480 int s = splnet(); /* needs to protect static "ro" below. */ 1481 static struct route_in6 ro; 1482 struct in6_multi *in6m; 1483 struct sockaddr_in6 *dst6; 1484 u_long linkmtu; 1485 1486 /* 1487 * Make a new reference to the packet; make sure that 1488 * the IPv6 header is actually copied, not just referenced, 1489 * so that ip6_output() only scribbles on the copy. 1490 */ 1491 mb_copy = m_copy(m, 0, M_COPYALL); 1492 if (mb_copy && 1493 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1494 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1495 if (mb_copy == NULL) { 1496 splx(s); 1497 return; 1498 } 1499 /* set MCAST flag to the outgoing packet */ 1500 mb_copy->m_flags |= M_MCAST; 1501 1502 /* 1503 * If we sourced the packet, call ip6_output since we may devide 1504 * the packet into fragments when the packet is too big for the 1505 * outgoing interface. 1506 * Otherwise, we can simply send the packet to the interface 1507 * sending queue. 1508 */ 1509 if (m->m_pkthdr.rcvif == NULL) { 1510 struct ip6_moptions im6o; 1511 1512 im6o.im6o_multicast_ifp = ifp; 1513 /* XXX: ip6_output will override ip6->ip6_hlim */ 1514 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1515 im6o.im6o_multicast_loop = 1; 1516 error = ip6_output(mb_copy, NULL, &ro, 1517 IPV6_FORWARDING, &im6o, NULL, NULL); 1518 1519 #ifdef MRT6DEBUG 1520 if (mrt6debug & DEBUG_XMIT) 1521 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1522 mifp - mif6table, error); 1523 #endif 1524 splx(s); 1525 return; 1526 } 1527 1528 /* 1529 * If we belong to the destination multicast group 1530 * on the outgoing interface, loop back a copy. 1531 */ 1532 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1533 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1534 if (in6m != NULL) { 1535 dst6->sin6_len = sizeof(struct sockaddr_in6); 1536 dst6->sin6_family = AF_INET6; 1537 dst6->sin6_addr = ip6->ip6_dst; 1538 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1539 } 1540 /* 1541 * Put the packet into the sending queue of the outgoing interface 1542 * if it would fit in the MTU of the interface. 1543 */ 1544 linkmtu = IN6_LINKMTU(ifp); 1545 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1546 dst6->sin6_len = sizeof(struct sockaddr_in6); 1547 dst6->sin6_family = AF_INET6; 1548 dst6->sin6_addr = ip6->ip6_dst; 1549 /* 1550 * We just call if_output instead of nd6_output here, since 1551 * we need no ND for a multicast forwarded packet...right? 1552 */ 1553 error = (*ifp->if_output)(ifp, mb_copy, 1554 (struct sockaddr *)&ro.ro_dst, NULL); 1555 #ifdef MRT6DEBUG 1556 if (mrt6debug & DEBUG_XMIT) 1557 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1558 mifp - mif6table, error); 1559 #endif 1560 } else { 1561 #ifdef MULTICAST_PMTUD 1562 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1563 #else 1564 #ifdef MRT6DEBUG 1565 if (mrt6debug & DEBUG_XMIT) 1566 log(LOG_DEBUG, 1567 "phyint_send: packet too big on %s o %s g %s" 1568 " size %d(discarded)\n", 1569 if_name(ifp), 1570 ip6_sprintf(&ip6->ip6_src), 1571 ip6_sprintf(&ip6->ip6_dst), 1572 mb_copy->m_pkthdr.len); 1573 #endif /* MRT6DEBUG */ 1574 m_freem(mb_copy); /* simply discard the packet */ 1575 #endif 1576 } 1577 1578 splx(s); 1579 } 1580 1581 static int 1582 register_send(ip6, mif, m) 1583 struct ip6_hdr *ip6; 1584 struct mif6 *mif; 1585 struct mbuf *m; 1586 { 1587 struct mbuf *mm; 1588 int i, len = m->m_pkthdr.len; 1589 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1590 struct mrt6msg *im6; 1591 1592 #ifdef MRT6DEBUG 1593 if (mrt6debug) 1594 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1595 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1596 #endif 1597 ++pim6stat.pim6s_snd_registers; 1598 1599 /* Make a copy of the packet to send to the user level process */ 1600 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1601 if (mm == NULL) 1602 return (ENOBUFS); 1603 mm->m_pkthdr.rcvif = NULL; 1604 mm->m_data += max_linkhdr; 1605 mm->m_len = sizeof(struct ip6_hdr); 1606 1607 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1608 m_freem(mm); 1609 return (ENOBUFS); 1610 } 1611 i = MHLEN - M_LEADINGSPACE(mm); 1612 if (i > len) 1613 i = len; 1614 mm = m_pullup(mm, i); 1615 if (mm == NULL) 1616 return (ENOBUFS); 1617 /* TODO: check it! */ 1618 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1619 1620 /* 1621 * Send message to routing daemon 1622 */ 1623 sin6.sin6_addr = ip6->ip6_src; 1624 1625 im6 = mtod(mm, struct mrt6msg *); 1626 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1627 im6->im6_mbz = 0; 1628 1629 im6->im6_mif = mif - mif6table; 1630 1631 /* iif info is not given for reg. encap.n */ 1632 mrt6stat.mrt6s_upcalls++; 1633 1634 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1635 #ifdef MRT6DEBUG 1636 if (mrt6debug) 1637 log(LOG_WARNING, 1638 "register_send: ip6_mrouter socket queue full\n"); 1639 #endif 1640 ++mrt6stat.mrt6s_upq_sockfull; 1641 return (ENOBUFS); 1642 } 1643 return (0); 1644 } 1645 1646 /* 1647 * PIM sparse mode hook 1648 * Receives the pim control messages, and passes them up to the listening 1649 * socket, using rip6_input. 1650 * The only message processed is the REGISTER pim message; the pim header 1651 * is stripped off, and the inner packet is passed to register_mforward. 1652 */ 1653 int 1654 pim6_input(mp, offp, proto) 1655 struct mbuf **mp; 1656 int *offp, proto; 1657 { 1658 struct pim *pim; /* pointer to a pim struct */ 1659 struct ip6_hdr *ip6; 1660 int pimlen; 1661 struct mbuf *m = *mp; 1662 int minlen; 1663 int off = *offp; 1664 1665 ++pim6stat.pim6s_rcv_total; 1666 1667 ip6 = mtod(m, struct ip6_hdr *); 1668 pimlen = m->m_pkthdr.len - *offp; 1669 1670 /* 1671 * Validate lengths 1672 */ 1673 if (pimlen < PIM_MINLEN) { 1674 ++pim6stat.pim6s_rcv_tooshort; 1675 #ifdef MRT6DEBUG 1676 if (mrt6debug & DEBUG_PIM) 1677 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1678 #endif 1679 m_freem(m); 1680 return (IPPROTO_DONE); 1681 } 1682 1683 /* 1684 * if the packet is at least as big as a REGISTER, go ahead 1685 * and grab the PIM REGISTER header size, to avoid another 1686 * possible m_pullup() later. 1687 * 1688 * PIM_MINLEN == pimhdr + u_int32 == 8 1689 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1690 */ 1691 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1692 1693 /* 1694 * Make sure that the IP6 and PIM headers in contiguous memory, and 1695 * possibly the PIM REGISTER header 1696 */ 1697 #ifndef PULLDOWN_TEST 1698 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1699 /* adjust pointer */ 1700 ip6 = mtod(m, struct ip6_hdr *); 1701 1702 /* adjust mbuf to point to the PIM header */ 1703 pim = (struct pim *)((caddr_t)ip6 + off); 1704 #else 1705 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1706 if (pim == NULL) { 1707 pim6stat.pim6s_rcv_tooshort++; 1708 return (IPPROTO_DONE); 1709 } 1710 #endif 1711 1712 #define PIM6_CHECKSUM 1713 #ifdef PIM6_CHECKSUM 1714 { 1715 int cksumlen; 1716 1717 /* 1718 * Validate checksum. 1719 * If PIM REGISTER, exclude the data packet 1720 */ 1721 if (pim->pim_type == PIM_REGISTER) 1722 cksumlen = PIM_MINLEN; 1723 else 1724 cksumlen = pimlen; 1725 1726 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1727 ++pim6stat.pim6s_rcv_badsum; 1728 #ifdef MRT6DEBUG 1729 if (mrt6debug & DEBUG_PIM) 1730 log(LOG_DEBUG, 1731 "pim6_input: invalid checksum\n"); 1732 #endif 1733 m_freem(m); 1734 return (IPPROTO_DONE); 1735 } 1736 } 1737 #endif /* PIM_CHECKSUM */ 1738 1739 /* PIM version check */ 1740 if (pim->pim_ver != PIM_VERSION) { 1741 ++pim6stat.pim6s_rcv_badversion; 1742 #ifdef MRT6DEBUG 1743 log(LOG_ERR, 1744 "pim6_input: incorrect version %d, expecting %d\n", 1745 pim->pim_ver, PIM_VERSION); 1746 #endif 1747 m_freem(m); 1748 return (IPPROTO_DONE); 1749 } 1750 1751 if (pim->pim_type == PIM_REGISTER) { 1752 /* 1753 * since this is a REGISTER, we'll make a copy of the register 1754 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1755 * routing daemon. 1756 */ 1757 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1758 1759 struct mbuf *mcp; 1760 struct ip6_hdr *eip6; 1761 u_int32_t *reghdr; 1762 int rc; 1763 1764 ++pim6stat.pim6s_rcv_registers; 1765 1766 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1767 #ifdef MRT6DEBUG 1768 if (mrt6debug & DEBUG_PIM) 1769 log(LOG_DEBUG, 1770 "pim6_input: register mif not set: %d\n", 1771 reg_mif_num); 1772 #endif 1773 m_freem(m); 1774 return (IPPROTO_DONE); 1775 } 1776 1777 reghdr = (u_int32_t *)(pim + 1); 1778 1779 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1780 goto pim6_input_to_daemon; 1781 1782 /* 1783 * Validate length 1784 */ 1785 if (pimlen < PIM6_REG_MINLEN) { 1786 ++pim6stat.pim6s_rcv_tooshort; 1787 ++pim6stat.pim6s_rcv_badregisters; 1788 #ifdef MRT6DEBUG 1789 log(LOG_ERR, 1790 "pim6_input: register packet size too " 1791 "small %d from %s\n", 1792 pimlen, ip6_sprintf(&ip6->ip6_src)); 1793 #endif 1794 m_freem(m); 1795 return (IPPROTO_DONE); 1796 } 1797 1798 eip6 = (struct ip6_hdr *) (reghdr + 1); 1799 #ifdef MRT6DEBUG 1800 if (mrt6debug & DEBUG_PIM) 1801 log(LOG_DEBUG, 1802 "pim6_input[register], eip6: %s -> %s, " 1803 "eip6 plen %d\n", 1804 ip6_sprintf(&eip6->ip6_src), 1805 ip6_sprintf(&eip6->ip6_dst), 1806 ntohs(eip6->ip6_plen)); 1807 #endif 1808 1809 /* verify the version number of the inner packet */ 1810 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1811 ++pim6stat.pim6s_rcv_badregisters; 1812 #ifdef MRT6DEBUG 1813 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1814 "of the inner packet\n", 1815 (eip6->ip6_vfc & IPV6_VERSION)); 1816 #endif 1817 m_freem(m); 1818 return (IPPROTO_NONE); 1819 } 1820 1821 /* verify the inner packet is destined to a mcast group */ 1822 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1823 ++pim6stat.pim6s_rcv_badregisters; 1824 #ifdef MRT6DEBUG 1825 if (mrt6debug & DEBUG_PIM) 1826 log(LOG_DEBUG, 1827 "pim6_input: inner packet of register " 1828 "is not multicast %s\n", 1829 ip6_sprintf(&eip6->ip6_dst)); 1830 #endif 1831 m_freem(m); 1832 return (IPPROTO_DONE); 1833 } 1834 1835 /* 1836 * make a copy of the whole header to pass to the daemon later. 1837 */ 1838 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1839 if (mcp == NULL) { 1840 #ifdef MRT6DEBUG 1841 log(LOG_ERR, 1842 "pim6_input: pim register: " 1843 "could not copy register head\n"); 1844 #endif 1845 m_freem(m); 1846 return (IPPROTO_DONE); 1847 } 1848 1849 /* 1850 * forward the inner ip6 packet; point m_data at the inner ip6. 1851 */ 1852 m_adj(m, off + PIM_MINLEN); 1853 #ifdef MRT6DEBUG 1854 if (mrt6debug & DEBUG_PIM) { 1855 log(LOG_DEBUG, 1856 "pim6_input: forwarding decapsulated register: " 1857 "src %s, dst %s, mif %d\n", 1858 ip6_sprintf(&eip6->ip6_src), 1859 ip6_sprintf(&eip6->ip6_dst), 1860 reg_mif_num); 1861 } 1862 #endif 1863 1864 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1865 dst.sin6_family, 0); 1866 1867 /* prepare the register head to send to the mrouting daemon */ 1868 m = mcp; 1869 } 1870 1871 /* 1872 * Pass the PIM message up to the daemon; if it is a register message 1873 * pass the 'head' only up to the daemon. This includes the 1874 * encapsulator ip6 header, pim header, register header and the 1875 * encapsulated ip6 header. 1876 */ 1877 pim6_input_to_daemon: 1878 rip6_input(&m, offp, proto); 1879 return (IPPROTO_DONE); 1880 }
Cache object: db08be48240efbbc8d078b9bfff47d13
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