1 /*- 2 * Copyright (C) 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1989 Stephen Deering 34 * Copyright (c) 1992, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * Stephen Deering of Stanford University. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 65 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp 66 */ 67 68 /* 69 * IP multicast forwarding procedures 70 * 71 * Written by David Waitzman, BBN Labs, August 1988. 72 * Modified by Steve Deering, Stanford, February 1989. 73 * Modified by Mark J. Steiglitz, Stanford, May, 1991 74 * Modified by Van Jacobson, LBL, January 1993 75 * Modified by Ajit Thyagarajan, PARC, August 1993 76 * Modified by Bill Fenner, PARC, April 1994 77 * 78 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 79 */ 80 81 #include <sys/cdefs.h> 82 __FBSDID("$FreeBSD$"); 83 84 #include "opt_inet.h" 85 #include "opt_inet6.h" 86 87 #include <sys/param.h> 88 #include <sys/callout.h> 89 #include <sys/errno.h> 90 #include <sys/kernel.h> 91 #include <sys/lock.h> 92 #include <sys/malloc.h> 93 #include <sys/mbuf.h> 94 #include <sys/protosw.h> 95 #include <sys/signalvar.h> 96 #include <sys/socket.h> 97 #include <sys/socketvar.h> 98 #include <sys/sockio.h> 99 #include <sys/sx.h> 100 #include <sys/sysctl.h> 101 #include <sys/syslog.h> 102 #include <sys/systm.h> 103 #include <sys/time.h> 104 #include <sys/vimage.h> 105 106 #include <net/if.h> 107 #include <net/if_types.h> 108 #include <net/raw_cb.h> 109 #include <net/route.h> 110 111 #include <netinet/in.h> 112 #include <netinet/in_var.h> 113 #include <netinet/icmp6.h> 114 115 #include <netinet/ip6.h> 116 #include <netinet6/ip6_var.h> 117 #include <netinet6/scope6_var.h> 118 #include <netinet6/nd6.h> 119 #include <netinet6/ip6_mroute.h> 120 #include <netinet6/ip6protosw.h> 121 #include <netinet6/pim6.h> 122 #include <netinet6/pim6_var.h> 123 124 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 125 126 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 127 #define M_HASCL(m) ((m)->m_flags & M_EXT) 128 129 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 130 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 131 132 static int set_pim6(int *); 133 static int socket_send __P((struct socket *, struct mbuf *, 134 struct sockaddr_in6 *)); 135 static int register_send __P((struct ip6_hdr *, struct mif6 *, 136 struct mbuf *)); 137 138 extern struct domain inet6domain; 139 140 /* XXX: referenced from ip_mroute.c for dynamically loading this code. */ 141 struct ip6protosw in6_pim_protosw = { 142 .pr_type = SOCK_RAW, 143 .pr_domain = &inet6domain, 144 .pr_protocol = IPPROTO_PIM, 145 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 146 .pr_input = pim6_input, 147 .pr_output = rip6_output, 148 .pr_ctloutput = rip6_ctloutput, 149 .pr_usrreqs = &rip6_usrreqs 150 }; 151 152 static int ip6_mrouter_ver = 0; 153 154 SYSCTL_DECL(_net_inet6); 155 SYSCTL_DECL(_net_inet6_ip6); 156 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 157 158 static struct mrt6stat mrt6stat; 159 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 160 &mrt6stat, mrt6stat, 161 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 162 163 #define NO_RTE_FOUND 0x1 164 #define RTE_FOUND 0x2 165 166 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 167 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 168 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 169 "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 170 "netinet6/ip6_mroute.h)"); 171 172 static u_char n6expire[MF6CTBLSIZ]; 173 174 static struct mif6 mif6table[MAXMIFS]; 175 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 176 &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]", 177 "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)"); 178 179 #ifdef MRT6DEBUG 180 static u_int mrt6debug = 0; /* debug level */ 181 #define DEBUG_MFC 0x02 182 #define DEBUG_FORWARD 0x04 183 #define DEBUG_EXPIRE 0x08 184 #define DEBUG_XMIT 0x10 185 #define DEBUG_REG 0x20 186 #define DEBUG_PIM 0x40 187 #endif 188 189 static void expire_upcalls(void *); 190 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 191 #define UPCALL_EXPIRE 6 /* number of timeouts */ 192 193 #ifdef INET 194 #ifdef MROUTING 195 extern struct socket *ip_mrouter; 196 #endif 197 #endif 198 199 /* 200 * 'Interfaces' associated with decapsulator (so we can tell 201 * packets that went through it from ones that get reflected 202 * by a broken gateway). Different from IPv4 register_if, 203 * these interfaces are linked into the system ifnet list, 204 * because per-interface IPv6 statistics are maintained in 205 * ifp->if_afdata. But it does not have any routes point 206 * to them. I.e., packets can't be sent this way. They 207 * only exist as a placeholder for multicast source 208 * verification. 209 */ 210 static struct ifnet *multicast_register_if6; 211 212 #define ENCAP_HOPS 64 213 214 /* 215 * Private variables. 216 */ 217 static mifi_t nummifs = 0; 218 static mifi_t reg_mif_num = (mifi_t)-1; 219 220 static struct pim6stat pim6stat; 221 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 222 &pim6stat, pim6stat, 223 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 224 225 static int pim6; 226 227 /* 228 * Hash function for a source, group entry 229 */ 230 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 231 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 232 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 233 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 234 235 /* 236 * Find a route for a given origin IPv6 address and Multicast group address. 237 */ 238 #define MF6CFIND(o, g, rt) do { \ 239 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 240 rt = NULL; \ 241 mrt6stat.mrt6s_mfc_lookups++; \ 242 while (_rt) { \ 243 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 244 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 245 (_rt->mf6c_stall == NULL)) { \ 246 rt = _rt; \ 247 break; \ 248 } \ 249 _rt = _rt->mf6c_next; \ 250 } \ 251 if (rt == NULL) { \ 252 mrt6stat.mrt6s_mfc_misses++; \ 253 } \ 254 } while (/*CONSTCOND*/ 0) 255 256 /* 257 * Macros to compute elapsed time efficiently 258 * Borrowed from Van Jacobson's scheduling code 259 * XXX: replace with timersub() ? 260 */ 261 #define TV_DELTA(a, b, delta) do { \ 262 int xxs; \ 263 \ 264 delta = (a).tv_usec - (b).tv_usec; \ 265 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 266 switch (xxs) { \ 267 case 2: \ 268 delta += 1000000; \ 269 /* FALLTHROUGH */ \ 270 case 1: \ 271 delta += 1000000; \ 272 break; \ 273 default: \ 274 delta += (1000000 * xxs); \ 275 } \ 276 } \ 277 } while (/*CONSTCOND*/ 0) 278 279 /* XXX: replace with timercmp(a, b, <) ? */ 280 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 281 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 282 283 #ifdef UPCALL_TIMING 284 #define UPCALL_MAX 50 285 static u_long upcall_data[UPCALL_MAX + 1]; 286 static void collate(); 287 #endif /* UPCALL_TIMING */ 288 289 static int get_sg_cnt(struct sioc_sg_req6 *); 290 static int get_mif6_cnt(struct sioc_mif_req6 *); 291 static int ip6_mrouter_init(struct socket *, int, int); 292 static int add_m6if(struct mif6ctl *); 293 static int del_m6if(mifi_t *); 294 static int add_m6fc(struct mf6cctl *); 295 static int del_m6fc(struct mf6cctl *); 296 297 static struct callout expire_upcalls_ch; 298 299 int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m); 300 int X_ip6_mrouter_done(void); 301 int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt); 302 int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt); 303 int X_mrt6_ioctl(int cmd, caddr_t data); 304 305 /* 306 * Handle MRT setsockopt commands to modify the multicast routing tables. 307 */ 308 int 309 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 310 { 311 int error = 0; 312 int optval; 313 struct mif6ctl mifc; 314 struct mf6cctl mfcc; 315 mifi_t mifi; 316 317 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 318 return (EACCES); 319 320 switch (sopt->sopt_name) { 321 case MRT6_INIT: 322 #ifdef MRT6_OINIT 323 case MRT6_OINIT: 324 #endif 325 error = sooptcopyin(sopt, &optval, sizeof(optval), 326 sizeof(optval)); 327 if (error) 328 break; 329 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 330 break; 331 case MRT6_DONE: 332 error = X_ip6_mrouter_done(); 333 break; 334 case MRT6_ADD_MIF: 335 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 336 if (error) 337 break; 338 error = add_m6if(&mifc); 339 break; 340 case MRT6_ADD_MFC: 341 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 342 if (error) 343 break; 344 error = add_m6fc(&mfcc); 345 break; 346 case MRT6_DEL_MFC: 347 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 348 if (error) 349 break; 350 error = del_m6fc(&mfcc); 351 break; 352 case MRT6_DEL_MIF: 353 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 354 if (error) 355 break; 356 error = del_m6if(&mifi); 357 break; 358 case MRT6_PIM: 359 error = sooptcopyin(sopt, &optval, sizeof(optval), 360 sizeof(optval)); 361 if (error) 362 break; 363 error = set_pim6(&optval); 364 break; 365 default: 366 error = EOPNOTSUPP; 367 break; 368 } 369 370 return (error); 371 } 372 373 /* 374 * Handle MRT getsockopt commands 375 */ 376 int 377 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 378 { 379 INIT_VNET_INET6(curvnet); 380 int error = 0; 381 382 if (so != ip6_mrouter) 383 return (EACCES); 384 385 switch (sopt->sopt_name) { 386 case MRT6_PIM: 387 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 388 break; 389 } 390 return (error); 391 } 392 393 /* 394 * Handle ioctl commands to obtain information from the cache 395 */ 396 int 397 X_mrt6_ioctl(int cmd, caddr_t data) 398 { 399 switch (cmd) { 400 case SIOCGETSGCNT_IN6: 401 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 402 case SIOCGETMIFCNT_IN6: 403 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 404 default: 405 return (EINVAL); 406 } 407 } 408 409 /* 410 * returns the packet, byte, rpf-failure count for the source group provided 411 */ 412 static int 413 get_sg_cnt(struct sioc_sg_req6 *req) 414 { 415 struct mf6c *rt; 416 int s; 417 418 s = splnet(); 419 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 420 splx(s); 421 if (rt != NULL) { 422 req->pktcnt = rt->mf6c_pkt_cnt; 423 req->bytecnt = rt->mf6c_byte_cnt; 424 req->wrong_if = rt->mf6c_wrong_if; 425 } else 426 return (ESRCH); 427 #if 0 428 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 429 #endif 430 431 return (0); 432 } 433 434 /* 435 * returns the input and output packet and byte counts on the mif provided 436 */ 437 static int 438 get_mif6_cnt(struct sioc_mif_req6 *req) 439 { 440 mifi_t mifi = req->mifi; 441 442 if (mifi >= nummifs) 443 return (EINVAL); 444 445 req->icount = mif6table[mifi].m6_pkt_in; 446 req->ocount = mif6table[mifi].m6_pkt_out; 447 req->ibytes = mif6table[mifi].m6_bytes_in; 448 req->obytes = mif6table[mifi].m6_bytes_out; 449 450 return (0); 451 } 452 453 static int 454 set_pim6(int *i) 455 { 456 INIT_VNET_INET6(curvnet); 457 if ((*i != 1) && (*i != 0)) 458 return (EINVAL); 459 460 V_pim6 = *i; 461 462 return (0); 463 } 464 465 /* 466 * Enable multicast routing 467 */ 468 static int 469 ip6_mrouter_init(struct socket *so, int v, int cmd) 470 { 471 INIT_VNET_INET6(curvnet); 472 473 #ifdef MRT6DEBUG 474 if (V_mrt6debug) 475 log(LOG_DEBUG, 476 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 477 so->so_type, so->so_proto->pr_protocol); 478 #endif 479 480 if (so->so_type != SOCK_RAW || 481 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 482 return (EOPNOTSUPP); 483 484 if (v != 1) 485 return (ENOPROTOOPT); 486 487 if (ip6_mrouter != NULL) 488 return (EADDRINUSE); 489 490 ip6_mrouter = so; 491 V_ip6_mrouter_ver = cmd; 492 493 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 494 bzero((caddr_t)n6expire, sizeof(n6expire)); 495 496 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 497 498 callout_init(&expire_upcalls_ch, 0); 499 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 500 expire_upcalls, NULL); 501 502 #ifdef MRT6DEBUG 503 if (V_mrt6debug) 504 log(LOG_DEBUG, "ip6_mrouter_init\n"); 505 #endif 506 507 return (0); 508 } 509 510 /* 511 * Disable multicast routing 512 */ 513 int 514 X_ip6_mrouter_done(void) 515 { 516 INIT_VNET_INET6(curvnet); 517 mifi_t mifi; 518 int i; 519 struct mf6c *rt; 520 struct rtdetq *rte; 521 int s; 522 523 s = splnet(); 524 525 /* 526 * For each phyint in use, disable promiscuous reception of all IPv6 527 * multicasts. 528 */ 529 #ifdef INET 530 #ifdef MROUTING 531 /* 532 * If there is still IPv4 multicast routing daemon, 533 * we remain interfaces to receive all muliticasted packets. 534 * XXX: there may be an interface in which the IPv4 multicast 535 * daemon is not interested... 536 */ 537 if (!V_ip_mrouter) 538 #endif 539 #endif 540 { 541 for (mifi = 0; mifi < nummifs; mifi++) { 542 if (mif6table[mifi].m6_ifp && 543 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 544 if_allmulti(mif6table[mifi].m6_ifp, 0); 545 } 546 } 547 } 548 bzero((caddr_t)mif6table, sizeof(mif6table)); 549 nummifs = 0; 550 551 V_pim6 = 0; /* used to stub out/in pim specific code */ 552 553 callout_stop(&expire_upcalls_ch); 554 555 /* 556 * Free all multicast forwarding cache entries. 557 */ 558 for (i = 0; i < MF6CTBLSIZ; i++) { 559 rt = mf6ctable[i]; 560 while (rt) { 561 struct mf6c *frt; 562 563 for (rte = rt->mf6c_stall; rte != NULL; ) { 564 struct rtdetq *n = rte->next; 565 566 m_free(rte->m); 567 free(rte, M_MRTABLE6); 568 rte = n; 569 } 570 frt = rt; 571 rt = rt->mf6c_next; 572 free(frt, M_MRTABLE6); 573 } 574 } 575 576 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 577 578 /* 579 * Reset register interface 580 */ 581 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 582 if_detach(multicast_register_if6); 583 if_free(multicast_register_if6); 584 reg_mif_num = (mifi_t)-1; 585 multicast_register_if6 = NULL; 586 } 587 588 ip6_mrouter = NULL; 589 V_ip6_mrouter_ver = 0; 590 591 splx(s); 592 593 #ifdef MRT6DEBUG 594 if (V_mrt6debug) 595 log(LOG_DEBUG, "ip6_mrouter_done\n"); 596 #endif 597 598 return (0); 599 } 600 601 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 602 603 /* 604 * Add a mif to the mif table 605 */ 606 static int 607 add_m6if(struct mif6ctl *mifcp) 608 { 609 INIT_VNET_NET(curvnet); 610 struct mif6 *mifp; 611 struct ifnet *ifp; 612 int error, s; 613 614 if (mifcp->mif6c_mifi >= MAXMIFS) 615 return (EINVAL); 616 mifp = mif6table + mifcp->mif6c_mifi; 617 if (mifp->m6_ifp) 618 return (EADDRINUSE); /* XXX: is it appropriate? */ 619 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) 620 return (ENXIO); 621 ifp = ifnet_byindex(mifcp->mif6c_pifi); 622 623 if (mifcp->mif6c_flags & MIFF_REGISTER) { 624 if (reg_mif_num == (mifi_t)-1) { 625 ifp = if_alloc(IFT_OTHER); 626 627 if_initname(ifp, "register_mif", 0); 628 ifp->if_flags |= IFF_LOOPBACK; 629 if_attach(ifp); 630 multicast_register_if6 = ifp; 631 reg_mif_num = mifcp->mif6c_mifi; 632 /* 633 * it is impossible to guess the ifindex of the 634 * register interface. So mif6c_pifi is automatically 635 * calculated. 636 */ 637 mifcp->mif6c_pifi = ifp->if_index; 638 } else { 639 ifp = multicast_register_if6; 640 } 641 642 } /* if REGISTER */ 643 else { 644 /* Make sure the interface supports multicast */ 645 if ((ifp->if_flags & IFF_MULTICAST) == 0) 646 return (EOPNOTSUPP); 647 648 s = splnet(); 649 error = if_allmulti(ifp, 1); 650 splx(s); 651 if (error) 652 return (error); 653 } 654 655 s = splnet(); 656 mifp->m6_flags = mifcp->mif6c_flags; 657 mifp->m6_ifp = ifp; 658 659 /* initialize per mif pkt counters */ 660 mifp->m6_pkt_in = 0; 661 mifp->m6_pkt_out = 0; 662 mifp->m6_bytes_in = 0; 663 mifp->m6_bytes_out = 0; 664 splx(s); 665 666 /* Adjust nummifs up if the mifi is higher than nummifs */ 667 if (nummifs <= mifcp->mif6c_mifi) 668 nummifs = mifcp->mif6c_mifi + 1; 669 670 #ifdef MRT6DEBUG 671 if (V_mrt6debug) 672 log(LOG_DEBUG, 673 "add_mif #%d, phyint %s\n", 674 mifcp->mif6c_mifi, 675 ifp->if_xname); 676 #endif 677 678 return (0); 679 } 680 681 /* 682 * Delete a mif from the mif table 683 */ 684 static int 685 del_m6if(mifi_t *mifip) 686 { 687 struct mif6 *mifp = mif6table + *mifip; 688 mifi_t mifi; 689 struct ifnet *ifp; 690 int s; 691 692 if (*mifip >= nummifs) 693 return (EINVAL); 694 if (mifp->m6_ifp == NULL) 695 return (EINVAL); 696 697 s = splnet(); 698 699 if (!(mifp->m6_flags & MIFF_REGISTER)) { 700 /* 701 * XXX: what if there is yet IPv4 multicast daemon 702 * using the interface? 703 */ 704 ifp = mifp->m6_ifp; 705 706 if_allmulti(ifp, 0); 707 } else { 708 if (reg_mif_num != (mifi_t)-1 && 709 multicast_register_if6 != NULL) { 710 if_detach(multicast_register_if6); 711 if_free(multicast_register_if6); 712 reg_mif_num = (mifi_t)-1; 713 multicast_register_if6 = NULL; 714 } 715 } 716 717 bzero((caddr_t)mifp, sizeof(*mifp)); 718 719 /* Adjust nummifs down */ 720 for (mifi = nummifs; mifi > 0; mifi--) 721 if (mif6table[mifi - 1].m6_ifp) 722 break; 723 nummifs = mifi; 724 725 splx(s); 726 727 #ifdef MRT6DEBUG 728 if (V_mrt6debug) 729 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 730 #endif 731 732 return (0); 733 } 734 735 /* 736 * Add an mfc entry 737 */ 738 static int 739 add_m6fc(struct mf6cctl *mfccp) 740 { 741 struct mf6c *rt; 742 u_long hash; 743 struct rtdetq *rte; 744 u_short nstl; 745 int s; 746 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 747 748 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 749 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 750 751 /* If an entry already exists, just update the fields */ 752 if (rt) { 753 #ifdef MRT6DEBUG 754 if (V_mrt6debug & DEBUG_MFC) { 755 log(LOG_DEBUG, 756 "add_m6fc no upcall h %d o %s g %s p %x\n", 757 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 758 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 759 mfccp->mf6cc_parent); 760 } 761 #endif 762 763 s = splnet(); 764 rt->mf6c_parent = mfccp->mf6cc_parent; 765 rt->mf6c_ifset = mfccp->mf6cc_ifset; 766 splx(s); 767 return (0); 768 } 769 770 /* 771 * Find the entry for which the upcall was made and update 772 */ 773 s = splnet(); 774 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 775 mfccp->mf6cc_mcastgrp.sin6_addr); 776 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 777 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 778 &mfccp->mf6cc_origin.sin6_addr) && 779 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 780 &mfccp->mf6cc_mcastgrp.sin6_addr) && 781 (rt->mf6c_stall != NULL)) { 782 783 if (nstl++) 784 log(LOG_ERR, 785 "add_m6fc: %s o %s g %s p %x dbx %p\n", 786 "multiple kernel entries", 787 ip6_sprintf(ip6bufo, 788 &mfccp->mf6cc_origin.sin6_addr), 789 ip6_sprintf(ip6bufg, 790 &mfccp->mf6cc_mcastgrp.sin6_addr), 791 mfccp->mf6cc_parent, rt->mf6c_stall); 792 793 #ifdef MRT6DEBUG 794 if (V_mrt6debug & DEBUG_MFC) 795 log(LOG_DEBUG, 796 "add_m6fc o %s g %s p %x dbg %x\n", 797 ip6_sprintf(ip6bufo, 798 &mfccp->mf6cc_origin.sin6_addr), 799 ip6_sprintf(ip6bufg, 800 &mfccp->mf6cc_mcastgrp.sin6_addr), 801 mfccp->mf6cc_parent, rt->mf6c_stall); 802 #endif 803 804 rt->mf6c_origin = mfccp->mf6cc_origin; 805 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 806 rt->mf6c_parent = mfccp->mf6cc_parent; 807 rt->mf6c_ifset = mfccp->mf6cc_ifset; 808 /* initialize pkt counters per src-grp */ 809 rt->mf6c_pkt_cnt = 0; 810 rt->mf6c_byte_cnt = 0; 811 rt->mf6c_wrong_if = 0; 812 813 rt->mf6c_expire = 0; /* Don't clean this guy up */ 814 n6expire[hash]--; 815 816 /* free packets Qed at the end of this entry */ 817 for (rte = rt->mf6c_stall; rte != NULL; ) { 818 struct rtdetq *n = rte->next; 819 ip6_mdq(rte->m, rte->ifp, rt); 820 m_freem(rte->m); 821 #ifdef UPCALL_TIMING 822 collate(&(rte->t)); 823 #endif /* UPCALL_TIMING */ 824 free(rte, M_MRTABLE6); 825 rte = n; 826 } 827 rt->mf6c_stall = NULL; 828 } 829 } 830 831 /* 832 * It is possible that an entry is being inserted without an upcall 833 */ 834 if (nstl == 0) { 835 #ifdef MRT6DEBUG 836 if (V_mrt6debug & DEBUG_MFC) 837 log(LOG_DEBUG, 838 "add_mfc no upcall h %d o %s g %s p %x\n", 839 hash, 840 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 841 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 842 mfccp->mf6cc_parent); 843 #endif 844 845 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 846 847 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 848 &mfccp->mf6cc_origin.sin6_addr)&& 849 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 850 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 851 852 rt->mf6c_origin = mfccp->mf6cc_origin; 853 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 854 rt->mf6c_parent = mfccp->mf6cc_parent; 855 rt->mf6c_ifset = mfccp->mf6cc_ifset; 856 /* initialize pkt counters per src-grp */ 857 rt->mf6c_pkt_cnt = 0; 858 rt->mf6c_byte_cnt = 0; 859 rt->mf6c_wrong_if = 0; 860 861 if (rt->mf6c_expire) 862 n6expire[hash]--; 863 rt->mf6c_expire = 0; 864 } 865 } 866 if (rt == NULL) { 867 /* no upcall, so make a new entry */ 868 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 869 M_NOWAIT); 870 if (rt == NULL) { 871 splx(s); 872 return (ENOBUFS); 873 } 874 875 /* insert new entry at head of hash chain */ 876 rt->mf6c_origin = mfccp->mf6cc_origin; 877 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 878 rt->mf6c_parent = mfccp->mf6cc_parent; 879 rt->mf6c_ifset = mfccp->mf6cc_ifset; 880 /* initialize pkt counters per src-grp */ 881 rt->mf6c_pkt_cnt = 0; 882 rt->mf6c_byte_cnt = 0; 883 rt->mf6c_wrong_if = 0; 884 rt->mf6c_expire = 0; 885 rt->mf6c_stall = NULL; 886 887 /* link into table */ 888 rt->mf6c_next = mf6ctable[hash]; 889 mf6ctable[hash] = rt; 890 } 891 } 892 splx(s); 893 return (0); 894 } 895 896 #ifdef UPCALL_TIMING 897 /* 898 * collect delay statistics on the upcalls 899 */ 900 static void 901 collate(struct timeval *t) 902 { 903 u_long d; 904 struct timeval tp; 905 u_long delta; 906 907 GET_TIME(tp); 908 909 if (TV_LT(*t, tp)) 910 { 911 TV_DELTA(tp, *t, delta); 912 913 d = delta >> 10; 914 if (d > UPCALL_MAX) 915 d = UPCALL_MAX; 916 917 ++upcall_data[d]; 918 } 919 } 920 #endif /* UPCALL_TIMING */ 921 922 /* 923 * Delete an mfc entry 924 */ 925 static int 926 del_m6fc(struct mf6cctl *mfccp) 927 { 928 struct sockaddr_in6 origin; 929 struct sockaddr_in6 mcastgrp; 930 struct mf6c *rt; 931 struct mf6c **nptr; 932 u_long hash; 933 int s; 934 935 origin = mfccp->mf6cc_origin; 936 mcastgrp = mfccp->mf6cc_mcastgrp; 937 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 938 939 #ifdef MRT6DEBUG 940 if (V_mrt6debug & DEBUG_MFC) { 941 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 942 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 943 ip6_sprintf(ip6bufo, &origin.sin6_addr), 944 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 945 } 946 #endif 947 948 s = splnet(); 949 950 nptr = &mf6ctable[hash]; 951 while ((rt = *nptr) != NULL) { 952 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 953 &rt->mf6c_origin.sin6_addr) && 954 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 955 &rt->mf6c_mcastgrp.sin6_addr) && 956 rt->mf6c_stall == NULL) 957 break; 958 959 nptr = &rt->mf6c_next; 960 } 961 if (rt == NULL) { 962 splx(s); 963 return (EADDRNOTAVAIL); 964 } 965 966 *nptr = rt->mf6c_next; 967 free(rt, M_MRTABLE6); 968 969 splx(s); 970 971 return (0); 972 } 973 974 static int 975 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 976 { 977 978 if (s) { 979 if (sbappendaddr(&s->so_rcv, 980 (struct sockaddr *)src, 981 mm, (struct mbuf *)0) != 0) { 982 sorwakeup(s); 983 return (0); 984 } 985 } 986 m_freem(mm); 987 return (-1); 988 } 989 990 /* 991 * IPv6 multicast forwarding function. This function assumes that the packet 992 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 993 * pointed to by "ifp", and the packet is to be relayed to other networks 994 * that have members of the packet's destination IPv6 multicast group. 995 * 996 * The packet is returned unscathed to the caller, unless it is 997 * erroneous, in which case a non-zero return value tells the caller to 998 * discard it. 999 * 1000 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1001 * this function is called in the originating context (i.e., not when 1002 * forwarding a packet from other node). ip6_output(), which is currently the 1003 * only function that calls this function is called in the originating context, 1004 * explicitly ensures this condition. It is caller's responsibility to ensure 1005 * that if this function is called from somewhere else in the originating 1006 * context in the future. 1007 */ 1008 int 1009 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1010 { 1011 INIT_VNET_INET6(curvnet); 1012 struct mf6c *rt; 1013 struct mif6 *mifp; 1014 struct mbuf *mm; 1015 int s; 1016 mifi_t mifi; 1017 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1018 1019 #ifdef MRT6DEBUG 1020 if (V_mrt6debug & DEBUG_FORWARD) 1021 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1022 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1023 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1024 ifp->if_index); 1025 #endif 1026 1027 /* 1028 * Don't forward a packet with Hop limit of zero or one, 1029 * or a packet destined to a local-only group. 1030 */ 1031 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1032 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1033 return (0); 1034 ip6->ip6_hlim--; 1035 1036 /* 1037 * Source address check: do not forward packets with unspecified 1038 * source. It was discussed in July 2000, on ipngwg mailing list. 1039 * This is rather more serious than unicast cases, because some 1040 * MLD packets can be sent with the unspecified source address 1041 * (although such packets must normally set 1 to the hop limit field). 1042 */ 1043 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1044 V_ip6stat.ip6s_cantforward++; 1045 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1046 V_ip6_log_time = time_second; 1047 log(LOG_DEBUG, 1048 "cannot forward " 1049 "from %s to %s nxt %d received on %s\n", 1050 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1051 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1052 ip6->ip6_nxt, 1053 if_name(m->m_pkthdr.rcvif)); 1054 } 1055 return (0); 1056 } 1057 1058 /* 1059 * Determine forwarding mifs from the forwarding cache table 1060 */ 1061 s = splnet(); 1062 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1063 1064 /* Entry exists, so forward if necessary */ 1065 if (rt) { 1066 splx(s); 1067 return (ip6_mdq(m, ifp, rt)); 1068 } else { 1069 /* 1070 * If we don't have a route for packet's origin, 1071 * Make a copy of the packet & 1072 * send message to routing daemon 1073 */ 1074 1075 struct mbuf *mb0; 1076 struct rtdetq *rte; 1077 u_long hash; 1078 /* int i, npkts;*/ 1079 #ifdef UPCALL_TIMING 1080 struct timeval tp; 1081 1082 GET_TIME(tp); 1083 #endif /* UPCALL_TIMING */ 1084 1085 mrt6stat.mrt6s_no_route++; 1086 #ifdef MRT6DEBUG 1087 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1088 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1089 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1090 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1091 #endif 1092 1093 /* 1094 * Allocate mbufs early so that we don't do extra work if we 1095 * are just going to fail anyway. 1096 */ 1097 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1098 M_NOWAIT); 1099 if (rte == NULL) { 1100 splx(s); 1101 return (ENOBUFS); 1102 } 1103 mb0 = m_copy(m, 0, M_COPYALL); 1104 /* 1105 * Pullup packet header if needed before storing it, 1106 * as other references may modify it in the meantime. 1107 */ 1108 if (mb0 && 1109 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1110 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1111 if (mb0 == NULL) { 1112 free(rte, M_MRTABLE6); 1113 splx(s); 1114 return (ENOBUFS); 1115 } 1116 1117 /* is there an upcall waiting for this packet? */ 1118 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1119 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1120 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1121 &rt->mf6c_origin.sin6_addr) && 1122 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1123 &rt->mf6c_mcastgrp.sin6_addr) && 1124 (rt->mf6c_stall != NULL)) 1125 break; 1126 } 1127 1128 if (rt == NULL) { 1129 struct mrt6msg *im; 1130 #ifdef MRT6_OINIT 1131 struct omrt6msg *oim; 1132 #endif 1133 1134 /* no upcall, so make a new entry */ 1135 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1136 M_NOWAIT); 1137 if (rt == NULL) { 1138 free(rte, M_MRTABLE6); 1139 m_freem(mb0); 1140 splx(s); 1141 return (ENOBUFS); 1142 } 1143 /* 1144 * Make a copy of the header to send to the user 1145 * level process 1146 */ 1147 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1148 1149 if (mm == NULL) { 1150 free(rte, M_MRTABLE6); 1151 m_freem(mb0); 1152 free(rt, M_MRTABLE6); 1153 splx(s); 1154 return (ENOBUFS); 1155 } 1156 1157 /* 1158 * Send message to routing daemon 1159 */ 1160 sin6.sin6_addr = ip6->ip6_src; 1161 1162 im = NULL; 1163 #ifdef MRT6_OINIT 1164 oim = NULL; 1165 #endif 1166 switch (V_ip6_mrouter_ver) { 1167 #ifdef MRT6_OINIT 1168 case MRT6_OINIT: 1169 oim = mtod(mm, struct omrt6msg *); 1170 oim->im6_msgtype = MRT6MSG_NOCACHE; 1171 oim->im6_mbz = 0; 1172 break; 1173 #endif 1174 case MRT6_INIT: 1175 im = mtod(mm, struct mrt6msg *); 1176 im->im6_msgtype = MRT6MSG_NOCACHE; 1177 im->im6_mbz = 0; 1178 break; 1179 default: 1180 free(rte, M_MRTABLE6); 1181 m_freem(mb0); 1182 free(rt, M_MRTABLE6); 1183 splx(s); 1184 return (EINVAL); 1185 } 1186 1187 #ifdef MRT6DEBUG 1188 if (V_mrt6debug & DEBUG_FORWARD) 1189 log(LOG_DEBUG, 1190 "getting the iif info in the kernel\n"); 1191 #endif 1192 1193 for (mifp = mif6table, mifi = 0; 1194 mifi < nummifs && mifp->m6_ifp != ifp; 1195 mifp++, mifi++) 1196 ; 1197 1198 switch (V_ip6_mrouter_ver) { 1199 #ifdef MRT6_OINIT 1200 case MRT6_OINIT: 1201 oim->im6_mif = mifi; 1202 break; 1203 #endif 1204 case MRT6_INIT: 1205 im->im6_mif = mifi; 1206 break; 1207 } 1208 1209 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1210 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1211 "socket queue full\n"); 1212 mrt6stat.mrt6s_upq_sockfull++; 1213 free(rte, M_MRTABLE6); 1214 m_freem(mb0); 1215 free(rt, M_MRTABLE6); 1216 splx(s); 1217 return (ENOBUFS); 1218 } 1219 1220 mrt6stat.mrt6s_upcalls++; 1221 1222 /* insert new entry at head of hash chain */ 1223 bzero(rt, sizeof(*rt)); 1224 rt->mf6c_origin.sin6_family = AF_INET6; 1225 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1226 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1227 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1228 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1229 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1230 rt->mf6c_expire = UPCALL_EXPIRE; 1231 n6expire[hash]++; 1232 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1233 1234 /* link into table */ 1235 rt->mf6c_next = mf6ctable[hash]; 1236 mf6ctable[hash] = rt; 1237 /* Add this entry to the end of the queue */ 1238 rt->mf6c_stall = rte; 1239 } else { 1240 /* determine if q has overflowed */ 1241 struct rtdetq **p; 1242 int npkts = 0; 1243 1244 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1245 if (++npkts > MAX_UPQ6) { 1246 mrt6stat.mrt6s_upq_ovflw++; 1247 free(rte, M_MRTABLE6); 1248 m_freem(mb0); 1249 splx(s); 1250 return (0); 1251 } 1252 1253 /* Add this entry to the end of the queue */ 1254 *p = rte; 1255 } 1256 1257 rte->next = NULL; 1258 rte->m = mb0; 1259 rte->ifp = ifp; 1260 #ifdef UPCALL_TIMING 1261 rte->t = tp; 1262 #endif /* UPCALL_TIMING */ 1263 1264 splx(s); 1265 1266 return (0); 1267 } 1268 } 1269 1270 /* 1271 * Clean up cache entries if upcalls are not serviced 1272 * Call from the Slow Timeout mechanism, every half second. 1273 */ 1274 static void 1275 expire_upcalls(void *unused) 1276 { 1277 struct rtdetq *rte; 1278 struct mf6c *mfc, **nptr; 1279 int i; 1280 int s; 1281 1282 s = splnet(); 1283 for (i = 0; i < MF6CTBLSIZ; i++) { 1284 if (n6expire[i] == 0) 1285 continue; 1286 nptr = &mf6ctable[i]; 1287 while ((mfc = *nptr) != NULL) { 1288 rte = mfc->mf6c_stall; 1289 /* 1290 * Skip real cache entries 1291 * Make sure it wasn't marked to not expire (shouldn't happen) 1292 * If it expires now 1293 */ 1294 if (rte != NULL && 1295 mfc->mf6c_expire != 0 && 1296 --mfc->mf6c_expire == 0) { 1297 #ifdef MRT6DEBUG 1298 if (V_mrt6debug & DEBUG_EXPIRE) { 1299 char ip6bufo[INET6_ADDRSTRLEN]; 1300 char ip6bufg[INET6_ADDRSTRLEN]; 1301 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1302 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1303 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1304 } 1305 #endif 1306 /* 1307 * drop all the packets 1308 * free the mbuf with the pkt, if, timing info 1309 */ 1310 do { 1311 struct rtdetq *n = rte->next; 1312 m_freem(rte->m); 1313 free(rte, M_MRTABLE6); 1314 rte = n; 1315 } while (rte != NULL); 1316 mrt6stat.mrt6s_cache_cleanups++; 1317 n6expire[i]--; 1318 1319 *nptr = mfc->mf6c_next; 1320 free(mfc, M_MRTABLE6); 1321 } else { 1322 nptr = &mfc->mf6c_next; 1323 } 1324 } 1325 } 1326 splx(s); 1327 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1328 expire_upcalls, NULL); 1329 } 1330 1331 /* 1332 * Packet forwarding routine once entry in the cache is made 1333 */ 1334 static int 1335 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1336 { 1337 INIT_VNET_INET6(curvnet); 1338 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1339 mifi_t mifi, iif; 1340 struct mif6 *mifp; 1341 int plen = m->m_pkthdr.len; 1342 struct in6_addr src0, dst0; /* copies for local work */ 1343 u_int32_t iszone, idzone, oszone, odzone; 1344 int error = 0; 1345 1346 /* 1347 * Macro to send packet on mif. Since RSVP packets don't get counted on 1348 * input, they shouldn't get counted on output, so statistics keeping is 1349 * separate. 1350 */ 1351 1352 #define MC6_SEND(ip6, mifp, m) do { \ 1353 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1354 register_send((ip6), (mifp), (m)); \ 1355 else \ 1356 phyint_send((ip6), (mifp), (m)); \ 1357 } while (/*CONSTCOND*/ 0) 1358 1359 /* 1360 * Don't forward if it didn't arrive from the parent mif 1361 * for its origin. 1362 */ 1363 mifi = rt->mf6c_parent; 1364 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1365 /* came in the wrong interface */ 1366 #ifdef MRT6DEBUG 1367 if (V_mrt6debug & DEBUG_FORWARD) 1368 log(LOG_DEBUG, 1369 "wrong if: ifid %d mifi %d mififid %x\n", 1370 ifp->if_index, mifi, 1371 mif6table[mifi].m6_ifp->if_index); 1372 #endif 1373 mrt6stat.mrt6s_wrong_if++; 1374 rt->mf6c_wrong_if++; 1375 /* 1376 * If we are doing PIM processing, and we are forwarding 1377 * packets on this interface, send a message to the 1378 * routing daemon. 1379 */ 1380 /* have to make sure this is a valid mif */ 1381 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1382 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1383 /* 1384 * Check the M_LOOP flag to avoid an 1385 * unnecessary PIM assert. 1386 * XXX: M_LOOP is an ad-hoc hack... 1387 */ 1388 static struct sockaddr_in6 sin6 = 1389 { sizeof(sin6), AF_INET6 }; 1390 1391 struct mbuf *mm; 1392 struct mrt6msg *im; 1393 #ifdef MRT6_OINIT 1394 struct omrt6msg *oim; 1395 #endif 1396 1397 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1398 if (mm && 1399 (M_HASCL(mm) || 1400 mm->m_len < sizeof(struct ip6_hdr))) 1401 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1402 if (mm == NULL) 1403 return (ENOBUFS); 1404 1405 #ifdef MRT6_OINIT 1406 oim = NULL; 1407 #endif 1408 im = NULL; 1409 switch (V_ip6_mrouter_ver) { 1410 #ifdef MRT6_OINIT 1411 case MRT6_OINIT: 1412 oim = mtod(mm, struct omrt6msg *); 1413 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1414 oim->im6_mbz = 0; 1415 break; 1416 #endif 1417 case MRT6_INIT: 1418 im = mtod(mm, struct mrt6msg *); 1419 im->im6_msgtype = MRT6MSG_WRONGMIF; 1420 im->im6_mbz = 0; 1421 break; 1422 default: 1423 m_freem(mm); 1424 return (EINVAL); 1425 } 1426 1427 for (mifp = mif6table, iif = 0; 1428 iif < nummifs && mifp && 1429 mifp->m6_ifp != ifp; 1430 mifp++, iif++) 1431 ; 1432 1433 switch (V_ip6_mrouter_ver) { 1434 #ifdef MRT6_OINIT 1435 case MRT6_OINIT: 1436 oim->im6_mif = iif; 1437 sin6.sin6_addr = oim->im6_src; 1438 break; 1439 #endif 1440 case MRT6_INIT: 1441 im->im6_mif = iif; 1442 sin6.sin6_addr = im->im6_src; 1443 break; 1444 } 1445 1446 mrt6stat.mrt6s_upcalls++; 1447 1448 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1449 #ifdef MRT6DEBUG 1450 if (V_mrt6debug) 1451 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1452 #endif 1453 ++mrt6stat.mrt6s_upq_sockfull; 1454 return (ENOBUFS); 1455 } /* if socket Q full */ 1456 } /* if PIM */ 1457 return (0); 1458 } /* if wrong iif */ 1459 1460 /* If I sourced this packet, it counts as output, else it was input. */ 1461 if (m->m_pkthdr.rcvif == NULL) { 1462 /* XXX: is rcvif really NULL when output?? */ 1463 mif6table[mifi].m6_pkt_out++; 1464 mif6table[mifi].m6_bytes_out += plen; 1465 } else { 1466 mif6table[mifi].m6_pkt_in++; 1467 mif6table[mifi].m6_bytes_in += plen; 1468 } 1469 rt->mf6c_pkt_cnt++; 1470 rt->mf6c_byte_cnt += plen; 1471 1472 /* 1473 * For each mif, forward a copy of the packet if there are group 1474 * members downstream on the interface. 1475 */ 1476 src0 = ip6->ip6_src; 1477 dst0 = ip6->ip6_dst; 1478 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1479 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1480 V_ip6stat.ip6s_badscope++; 1481 return (error); 1482 } 1483 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1484 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1485 /* 1486 * check if the outgoing packet is going to break 1487 * a scope boundary. 1488 * XXX For packets through PIM register tunnel 1489 * interface, we believe a routing daemon. 1490 */ 1491 if (!(mif6table[rt->mf6c_parent].m6_flags & 1492 MIFF_REGISTER) && 1493 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1494 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1495 &oszone) || 1496 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1497 &odzone) || 1498 iszone != oszone || 1499 idzone != odzone) { 1500 V_ip6stat.ip6s_badscope++; 1501 continue; 1502 } 1503 } 1504 1505 mifp->m6_pkt_out++; 1506 mifp->m6_bytes_out += plen; 1507 MC6_SEND(ip6, mifp, m); 1508 } 1509 } 1510 return (0); 1511 } 1512 1513 static void 1514 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1515 { 1516 INIT_VNET_INET6(curvnet); 1517 struct mbuf *mb_copy; 1518 struct ifnet *ifp = mifp->m6_ifp; 1519 int error = 0; 1520 int s = splnet(); /* needs to protect static "ro" below. */ 1521 static struct route_in6 ro; 1522 struct in6_multi *in6m; 1523 struct sockaddr_in6 *dst6; 1524 u_long linkmtu; 1525 1526 /* 1527 * Make a new reference to the packet; make sure that 1528 * the IPv6 header is actually copied, not just referenced, 1529 * so that ip6_output() only scribbles on the copy. 1530 */ 1531 mb_copy = m_copy(m, 0, M_COPYALL); 1532 if (mb_copy && 1533 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1534 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1535 if (mb_copy == NULL) { 1536 splx(s); 1537 return; 1538 } 1539 /* set MCAST flag to the outgoing packet */ 1540 mb_copy->m_flags |= M_MCAST; 1541 1542 /* 1543 * If we sourced the packet, call ip6_output since we may devide 1544 * the packet into fragments when the packet is too big for the 1545 * outgoing interface. 1546 * Otherwise, we can simply send the packet to the interface 1547 * sending queue. 1548 */ 1549 if (m->m_pkthdr.rcvif == NULL) { 1550 struct ip6_moptions im6o; 1551 1552 im6o.im6o_multicast_ifp = ifp; 1553 /* XXX: ip6_output will override ip6->ip6_hlim */ 1554 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1555 im6o.im6o_multicast_loop = 1; 1556 error = ip6_output(mb_copy, NULL, &ro, 1557 IPV6_FORWARDING, &im6o, NULL, NULL); 1558 1559 #ifdef MRT6DEBUG 1560 if (V_mrt6debug & DEBUG_XMIT) 1561 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1562 mifp - mif6table, error); 1563 #endif 1564 splx(s); 1565 return; 1566 } 1567 1568 /* 1569 * If we belong to the destination multicast group 1570 * on the outgoing interface, loop back a copy. 1571 */ 1572 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1573 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1574 if (in6m != NULL) { 1575 dst6->sin6_len = sizeof(struct sockaddr_in6); 1576 dst6->sin6_family = AF_INET6; 1577 dst6->sin6_addr = ip6->ip6_dst; 1578 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1579 } 1580 /* 1581 * Put the packet into the sending queue of the outgoing interface 1582 * if it would fit in the MTU of the interface. 1583 */ 1584 linkmtu = IN6_LINKMTU(ifp); 1585 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1586 dst6->sin6_len = sizeof(struct sockaddr_in6); 1587 dst6->sin6_family = AF_INET6; 1588 dst6->sin6_addr = ip6->ip6_dst; 1589 /* 1590 * We just call if_output instead of nd6_output here, since 1591 * we need no ND for a multicast forwarded packet...right? 1592 */ 1593 error = (*ifp->if_output)(ifp, mb_copy, 1594 (struct sockaddr *)&ro.ro_dst, NULL); 1595 #ifdef MRT6DEBUG 1596 if (V_mrt6debug & DEBUG_XMIT) 1597 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1598 mifp - mif6table, error); 1599 #endif 1600 } else { 1601 /* 1602 * pMTU discovery is intentionally disabled by default, since 1603 * various router may notify pMTU in multicast, which can be 1604 * a DDoS to a router 1605 */ 1606 if (V_ip6_mcast_pmtu) 1607 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1608 else { 1609 #ifdef MRT6DEBUG 1610 if (V_mrt6debug & DEBUG_XMIT) { 1611 char ip6bufs[INET6_ADDRSTRLEN]; 1612 char ip6bufd[INET6_ADDRSTRLEN]; 1613 log(LOG_DEBUG, 1614 "phyint_send: packet too big on %s o %s " 1615 "g %s size %d(discarded)\n", 1616 if_name(ifp), 1617 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1618 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1619 mb_copy->m_pkthdr.len); 1620 } 1621 #endif /* MRT6DEBUG */ 1622 m_freem(mb_copy); /* simply discard the packet */ 1623 } 1624 } 1625 1626 splx(s); 1627 } 1628 1629 static int 1630 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1631 { 1632 struct mbuf *mm; 1633 int i, len = m->m_pkthdr.len; 1634 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1635 struct mrt6msg *im6; 1636 1637 #ifdef MRT6DEBUG 1638 if (V_mrt6debug) { 1639 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1640 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1641 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1642 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1643 } 1644 #endif 1645 ++pim6stat.pim6s_snd_registers; 1646 1647 /* Make a copy of the packet to send to the user level process */ 1648 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1649 if (mm == NULL) 1650 return (ENOBUFS); 1651 mm->m_pkthdr.rcvif = NULL; 1652 mm->m_data += max_linkhdr; 1653 mm->m_len = sizeof(struct ip6_hdr); 1654 1655 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1656 m_freem(mm); 1657 return (ENOBUFS); 1658 } 1659 i = MHLEN - M_LEADINGSPACE(mm); 1660 if (i > len) 1661 i = len; 1662 mm = m_pullup(mm, i); 1663 if (mm == NULL) 1664 return (ENOBUFS); 1665 /* TODO: check it! */ 1666 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1667 1668 /* 1669 * Send message to routing daemon 1670 */ 1671 sin6.sin6_addr = ip6->ip6_src; 1672 1673 im6 = mtod(mm, struct mrt6msg *); 1674 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1675 im6->im6_mbz = 0; 1676 1677 im6->im6_mif = mif - mif6table; 1678 1679 /* iif info is not given for reg. encap.n */ 1680 mrt6stat.mrt6s_upcalls++; 1681 1682 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1683 #ifdef MRT6DEBUG 1684 if (V_mrt6debug) 1685 log(LOG_WARNING, 1686 "register_send: ip6_mrouter socket queue full\n"); 1687 #endif 1688 ++mrt6stat.mrt6s_upq_sockfull; 1689 return (ENOBUFS); 1690 } 1691 return (0); 1692 } 1693 1694 /* 1695 * PIM sparse mode hook 1696 * Receives the pim control messages, and passes them up to the listening 1697 * socket, using rip6_input. 1698 * The only message processed is the REGISTER pim message; the pim header 1699 * is stripped off, and the inner packet is passed to register_mforward. 1700 */ 1701 int 1702 pim6_input(struct mbuf **mp, int *offp, int proto) 1703 { 1704 INIT_VNET_INET6(curvnet); 1705 struct pim *pim; /* pointer to a pim struct */ 1706 struct ip6_hdr *ip6; 1707 int pimlen; 1708 struct mbuf *m = *mp; 1709 int minlen; 1710 int off = *offp; 1711 1712 ++pim6stat.pim6s_rcv_total; 1713 1714 ip6 = mtod(m, struct ip6_hdr *); 1715 pimlen = m->m_pkthdr.len - *offp; 1716 1717 /* 1718 * Validate lengths 1719 */ 1720 if (pimlen < PIM_MINLEN) { 1721 ++pim6stat.pim6s_rcv_tooshort; 1722 #ifdef MRT6DEBUG 1723 if (V_mrt6debug & DEBUG_PIM) 1724 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1725 #endif 1726 m_freem(m); 1727 return (IPPROTO_DONE); 1728 } 1729 1730 /* 1731 * if the packet is at least as big as a REGISTER, go ahead 1732 * and grab the PIM REGISTER header size, to avoid another 1733 * possible m_pullup() later. 1734 * 1735 * PIM_MINLEN == pimhdr + u_int32 == 8 1736 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1737 */ 1738 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1739 1740 /* 1741 * Make sure that the IP6 and PIM headers in contiguous memory, and 1742 * possibly the PIM REGISTER header 1743 */ 1744 #ifndef PULLDOWN_TEST 1745 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1746 /* adjust pointer */ 1747 ip6 = mtod(m, struct ip6_hdr *); 1748 1749 /* adjust mbuf to point to the PIM header */ 1750 pim = (struct pim *)((caddr_t)ip6 + off); 1751 #else 1752 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1753 if (pim == NULL) { 1754 pim6stat.pim6s_rcv_tooshort++; 1755 return (IPPROTO_DONE); 1756 } 1757 #endif 1758 1759 #define PIM6_CHECKSUM 1760 #ifdef PIM6_CHECKSUM 1761 { 1762 int cksumlen; 1763 1764 /* 1765 * Validate checksum. 1766 * If PIM REGISTER, exclude the data packet 1767 */ 1768 if (pim->pim_type == PIM_REGISTER) 1769 cksumlen = PIM_MINLEN; 1770 else 1771 cksumlen = pimlen; 1772 1773 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1774 ++pim6stat.pim6s_rcv_badsum; 1775 #ifdef MRT6DEBUG 1776 if (V_mrt6debug & DEBUG_PIM) 1777 log(LOG_DEBUG, 1778 "pim6_input: invalid checksum\n"); 1779 #endif 1780 m_freem(m); 1781 return (IPPROTO_DONE); 1782 } 1783 } 1784 #endif /* PIM_CHECKSUM */ 1785 1786 /* PIM version check */ 1787 if (pim->pim_ver != PIM_VERSION) { 1788 ++pim6stat.pim6s_rcv_badversion; 1789 #ifdef MRT6DEBUG 1790 log(LOG_ERR, 1791 "pim6_input: incorrect version %d, expecting %d\n", 1792 pim->pim_ver, PIM_VERSION); 1793 #endif 1794 m_freem(m); 1795 return (IPPROTO_DONE); 1796 } 1797 1798 if (pim->pim_type == PIM_REGISTER) { 1799 /* 1800 * since this is a REGISTER, we'll make a copy of the register 1801 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1802 * routing daemon. 1803 */ 1804 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1805 1806 struct mbuf *mcp; 1807 struct ip6_hdr *eip6; 1808 u_int32_t *reghdr; 1809 int rc; 1810 #ifdef MRT6DEBUG 1811 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1812 #endif 1813 1814 ++pim6stat.pim6s_rcv_registers; 1815 1816 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1817 #ifdef MRT6DEBUG 1818 if (V_mrt6debug & DEBUG_PIM) 1819 log(LOG_DEBUG, 1820 "pim6_input: register mif not set: %d\n", 1821 reg_mif_num); 1822 #endif 1823 m_freem(m); 1824 return (IPPROTO_DONE); 1825 } 1826 1827 reghdr = (u_int32_t *)(pim + 1); 1828 1829 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1830 goto pim6_input_to_daemon; 1831 1832 /* 1833 * Validate length 1834 */ 1835 if (pimlen < PIM6_REG_MINLEN) { 1836 ++pim6stat.pim6s_rcv_tooshort; 1837 ++pim6stat.pim6s_rcv_badregisters; 1838 #ifdef MRT6DEBUG 1839 log(LOG_ERR, 1840 "pim6_input: register packet size too " 1841 "small %d from %s\n", 1842 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1843 #endif 1844 m_freem(m); 1845 return (IPPROTO_DONE); 1846 } 1847 1848 eip6 = (struct ip6_hdr *) (reghdr + 1); 1849 #ifdef MRT6DEBUG 1850 if (V_mrt6debug & DEBUG_PIM) 1851 log(LOG_DEBUG, 1852 "pim6_input[register], eip6: %s -> %s, " 1853 "eip6 plen %d\n", 1854 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1855 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1856 ntohs(eip6->ip6_plen)); 1857 #endif 1858 1859 /* verify the version number of the inner packet */ 1860 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1861 ++pim6stat.pim6s_rcv_badregisters; 1862 #ifdef MRT6DEBUG 1863 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1864 "of the inner packet\n", 1865 (eip6->ip6_vfc & IPV6_VERSION)); 1866 #endif 1867 m_freem(m); 1868 return (IPPROTO_NONE); 1869 } 1870 1871 /* verify the inner packet is destined to a mcast group */ 1872 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1873 ++pim6stat.pim6s_rcv_badregisters; 1874 #ifdef MRT6DEBUG 1875 if (V_mrt6debug & DEBUG_PIM) 1876 log(LOG_DEBUG, 1877 "pim6_input: inner packet of register " 1878 "is not multicast %s\n", 1879 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1880 #endif 1881 m_freem(m); 1882 return (IPPROTO_DONE); 1883 } 1884 1885 /* 1886 * make a copy of the whole header to pass to the daemon later. 1887 */ 1888 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1889 if (mcp == NULL) { 1890 #ifdef MRT6DEBUG 1891 log(LOG_ERR, 1892 "pim6_input: pim register: " 1893 "could not copy register head\n"); 1894 #endif 1895 m_freem(m); 1896 return (IPPROTO_DONE); 1897 } 1898 1899 /* 1900 * forward the inner ip6 packet; point m_data at the inner ip6. 1901 */ 1902 m_adj(m, off + PIM_MINLEN); 1903 #ifdef MRT6DEBUG 1904 if (V_mrt6debug & DEBUG_PIM) { 1905 log(LOG_DEBUG, 1906 "pim6_input: forwarding decapsulated register: " 1907 "src %s, dst %s, mif %d\n", 1908 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1909 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1910 reg_mif_num); 1911 } 1912 #endif 1913 1914 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1915 dst.sin6_family, 0); 1916 1917 /* prepare the register head to send to the mrouting daemon */ 1918 m = mcp; 1919 } 1920 1921 /* 1922 * Pass the PIM message up to the daemon; if it is a register message 1923 * pass the 'head' only up to the daemon. This includes the 1924 * encapsulator ip6 header, pim header, register header and the 1925 * encapsulated ip6 header. 1926 */ 1927 pim6_input_to_daemon: 1928 rip6_input(&m, offp, proto); 1929 return (IPPROTO_DONE); 1930 } 1931