ip6_mroute.c revision 185088
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: head/sys/netinet6/ip6_mroute.c 185088 2008-11-19 09:39:34Z zec $"); 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 124static 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 129static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 130static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 131 132static void pim6_init(void); 133static int set_pim6(int *); 134static int socket_send __P((struct socket *, struct mbuf *, 135 struct sockaddr_in6 *)); 136static int register_send __P((struct ip6_hdr *, struct mif6 *, 137 struct mbuf *)); 138 139extern struct domain inet6domain; 140 141/* XXX: referenced from ip_mroute.c for dynamically loading this code. */ 142struct ip6protosw in6_pim_protosw = { 143 .pr_type = SOCK_RAW, 144 .pr_domain = &inet6domain, 145 .pr_protocol = IPPROTO_PIM, 146 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 147 .pr_input = pim6_input, 148 .pr_output = rip6_output, 149 .pr_ctloutput = rip6_ctloutput, 150 .pr_init = pim6_init, 151 .pr_usrreqs = &rip6_usrreqs 152}; 153 154#ifdef VIMAGE_GLOBALS 155static int ip6_mrouter_ver; 156#endif 157 158SYSCTL_DECL(_net_inet6); 159SYSCTL_DECL(_net_inet6_ip6); 160SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 161 162static struct mrt6stat mrt6stat; 163SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 164 &mrt6stat, mrt6stat, 165 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 166 167#define NO_RTE_FOUND 0x1 168#define RTE_FOUND 0x2 169 170static struct mf6c *mf6ctable[MF6CTBLSIZ]; 171SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 172 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 173 "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 174 "netinet6/ip6_mroute.h)"); 175 176static u_char n6expire[MF6CTBLSIZ]; 177 178static struct mif6 mif6table[MAXMIFS]; 179SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 180 &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]", 181 "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)"); 182 183#ifdef MRT6DEBUG 184#ifdef VIMAGE_GLOBALS 185static u_int mrt6debug = 0; /* debug level */ 186#endif 187#define DEBUG_MFC 0x02 188#define DEBUG_FORWARD 0x04 189#define DEBUG_EXPIRE 0x08 190#define DEBUG_XMIT 0x10 191#define DEBUG_REG 0x20 192#define DEBUG_PIM 0x40 193#endif 194 195static void expire_upcalls(void *); 196#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 197#define UPCALL_EXPIRE 6 /* number of timeouts */ 198 199#ifdef INET 200#ifdef MROUTING 201extern struct socket *ip_mrouter; 202#endif 203#endif 204 205/* 206 * 'Interfaces' associated with decapsulator (so we can tell 207 * packets that went through it from ones that get reflected 208 * by a broken gateway). Different from IPv4 register_if, 209 * these interfaces are linked into the system ifnet list, 210 * because per-interface IPv6 statistics are maintained in 211 * ifp->if_afdata. But it does not have any routes point 212 * to them. I.e., packets can't be sent this way. They 213 * only exist as a placeholder for multicast source 214 * verification. 215 */ 216static struct ifnet *multicast_register_if6; 217 218#define ENCAP_HOPS 64 219 220/* 221 * Private variables. 222 */ 223static mifi_t nummifs = 0; 224static mifi_t reg_mif_num = (mifi_t)-1; 225 226static struct pim6stat pim6stat; 227SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 228 &pim6stat, pim6stat, 229 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 230 231#ifdef VIMAGE_GLOBALS 232static int pim6; 233#endif 234 235/* 236 * Hash function for a source, group entry 237 */ 238#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 239 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 240 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 241 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 242 243/* 244 * Find a route for a given origin IPv6 address and Multicast group address. 245 */ 246#define MF6CFIND(o, g, rt) do { \ 247 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 248 rt = NULL; \ 249 mrt6stat.mrt6s_mfc_lookups++; \ 250 while (_rt) { \ 251 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 252 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 253 (_rt->mf6c_stall == NULL)) { \ 254 rt = _rt; \ 255 break; \ 256 } \ 257 _rt = _rt->mf6c_next; \ 258 } \ 259 if (rt == NULL) { \ 260 mrt6stat.mrt6s_mfc_misses++; \ 261 } \ 262} while (/*CONSTCOND*/ 0) 263 264/* 265 * Macros to compute elapsed time efficiently 266 * Borrowed from Van Jacobson's scheduling code 267 * XXX: replace with timersub() ? 268 */ 269#define TV_DELTA(a, b, delta) do { \ 270 int xxs; \ 271 \ 272 delta = (a).tv_usec - (b).tv_usec; \ 273 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 274 switch (xxs) { \ 275 case 2: \ 276 delta += 1000000; \ 277 /* FALLTHROUGH */ \ 278 case 1: \ 279 delta += 1000000; \ 280 break; \ 281 default: \ 282 delta += (1000000 * xxs); \ 283 } \ 284 } \ 285} while (/*CONSTCOND*/ 0) 286 287/* XXX: replace with timercmp(a, b, <) ? */ 288#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 289 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 290 291#ifdef UPCALL_TIMING 292#define UPCALL_MAX 50 293static u_long upcall_data[UPCALL_MAX + 1]; 294static void collate(); 295#endif /* UPCALL_TIMING */ 296 297static int get_sg_cnt(struct sioc_sg_req6 *); 298static int get_mif6_cnt(struct sioc_mif_req6 *); 299static int ip6_mrouter_init(struct socket *, int, int); 300static int add_m6if(struct mif6ctl *); 301static int del_m6if(mifi_t *); 302static int add_m6fc(struct mf6cctl *); 303static int del_m6fc(struct mf6cctl *); 304 305static struct callout expire_upcalls_ch; 306 307int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m); 308int X_ip6_mrouter_done(void); 309int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt); 310int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt); 311int X_mrt6_ioctl(int cmd, caddr_t data); 312 313static void 314pim6_init(void) 315{ 316 INIT_VNET_INET6(curvnet); 317 318 V_ip6_mrouter_ver = 0; 319#ifdef MRT6DEBUG 320 V_mrt6debug = 0; /* debug level */ 321#endif 322} 323 324/* 325 * Handle MRT setsockopt commands to modify the multicast routing tables. 326 */ 327int 328X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 329{ 330 int error = 0; 331 int optval; 332 struct mif6ctl mifc; 333 struct mf6cctl mfcc; 334 mifi_t mifi; 335 336 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 337 return (EACCES); 338 339 switch (sopt->sopt_name) { 340 case MRT6_INIT: 341#ifdef MRT6_OINIT 342 case MRT6_OINIT: 343#endif 344 error = sooptcopyin(sopt, &optval, sizeof(optval), 345 sizeof(optval)); 346 if (error) 347 break; 348 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 349 break; 350 case MRT6_DONE: 351 error = X_ip6_mrouter_done(); 352 break; 353 case MRT6_ADD_MIF: 354 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 355 if (error) 356 break; 357 error = add_m6if(&mifc); 358 break; 359 case MRT6_ADD_MFC: 360 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 361 if (error) 362 break; 363 error = add_m6fc(&mfcc); 364 break; 365 case MRT6_DEL_MFC: 366 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 367 if (error) 368 break; 369 error = del_m6fc(&mfcc); 370 break; 371 case MRT6_DEL_MIF: 372 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 373 if (error) 374 break; 375 error = del_m6if(&mifi); 376 break; 377 case MRT6_PIM: 378 error = sooptcopyin(sopt, &optval, sizeof(optval), 379 sizeof(optval)); 380 if (error) 381 break; 382 error = set_pim6(&optval); 383 break; 384 default: 385 error = EOPNOTSUPP; 386 break; 387 } 388 389 return (error); 390} 391 392/* 393 * Handle MRT getsockopt commands 394 */ 395int 396X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 397{ 398 INIT_VNET_INET6(curvnet); 399 int error = 0; 400 401 if (so != ip6_mrouter) 402 return (EACCES); 403 404 switch (sopt->sopt_name) { 405 case MRT6_PIM: 406 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 407 break; 408 } 409 return (error); 410} 411 412/* 413 * Handle ioctl commands to obtain information from the cache 414 */ 415int 416X_mrt6_ioctl(int cmd, caddr_t data) 417{ 418 switch (cmd) { 419 case SIOCGETSGCNT_IN6: 420 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 421 case SIOCGETMIFCNT_IN6: 422 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 423 default: 424 return (EINVAL); 425 } 426} 427 428/* 429 * returns the packet, byte, rpf-failure count for the source group provided 430 */ 431static int 432get_sg_cnt(struct sioc_sg_req6 *req) 433{ 434 struct mf6c *rt; 435 int s; 436 437 s = splnet(); 438 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 439 splx(s); 440 if (rt != NULL) { 441 req->pktcnt = rt->mf6c_pkt_cnt; 442 req->bytecnt = rt->mf6c_byte_cnt; 443 req->wrong_if = rt->mf6c_wrong_if; 444 } else 445 return (ESRCH); 446#if 0 447 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 448#endif 449 450 return (0); 451} 452 453/* 454 * returns the input and output packet and byte counts on the mif provided 455 */ 456static int 457get_mif6_cnt(struct sioc_mif_req6 *req) 458{ 459 mifi_t mifi = req->mifi; 460 461 if (mifi >= nummifs) 462 return (EINVAL); 463 464 req->icount = mif6table[mifi].m6_pkt_in; 465 req->ocount = mif6table[mifi].m6_pkt_out; 466 req->ibytes = mif6table[mifi].m6_bytes_in; 467 req->obytes = mif6table[mifi].m6_bytes_out; 468 469 return (0); 470} 471 472static int 473set_pim6(int *i) 474{ 475 INIT_VNET_INET6(curvnet); 476 if ((*i != 1) && (*i != 0)) 477 return (EINVAL); 478 479 V_pim6 = *i; 480 481 return (0); 482} 483 484/* 485 * Enable multicast routing 486 */ 487static int 488ip6_mrouter_init(struct socket *so, int v, int cmd) 489{ 490 INIT_VNET_INET6(curvnet); 491 492#ifdef MRT6DEBUG 493 if (V_mrt6debug) 494 log(LOG_DEBUG, 495 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 496 so->so_type, so->so_proto->pr_protocol); 497#endif 498 499 if (so->so_type != SOCK_RAW || 500 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 501 return (EOPNOTSUPP); 502 503 if (v != 1) 504 return (ENOPROTOOPT); 505 506 if (ip6_mrouter != NULL) 507 return (EADDRINUSE); 508 509 ip6_mrouter = so; 510 V_ip6_mrouter_ver = cmd; 511 512 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 513 bzero((caddr_t)n6expire, sizeof(n6expire)); 514 515 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 516 517 callout_init(&expire_upcalls_ch, 0); 518 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 519 expire_upcalls, NULL); 520 521#ifdef MRT6DEBUG 522 if (V_mrt6debug) 523 log(LOG_DEBUG, "ip6_mrouter_init\n"); 524#endif 525 526 return (0); 527} 528 529/* 530 * Disable multicast routing 531 */ 532int 533X_ip6_mrouter_done(void) 534{ 535 INIT_VNET_INET6(curvnet); 536 mifi_t mifi; 537 int i; 538 struct mf6c *rt; 539 struct rtdetq *rte; 540 int s; 541 542 s = splnet(); 543 544 /* 545 * For each phyint in use, disable promiscuous reception of all IPv6 546 * multicasts. 547 */ 548#ifdef INET 549#ifdef MROUTING 550 /* 551 * If there is still IPv4 multicast routing daemon, 552 * we remain interfaces to receive all muliticasted packets. 553 * XXX: there may be an interface in which the IPv4 multicast 554 * daemon is not interested... 555 */ 556 if (!V_ip_mrouter) 557#endif 558#endif 559 { 560 for (mifi = 0; mifi < nummifs; mifi++) { 561 if (mif6table[mifi].m6_ifp && 562 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 563 if_allmulti(mif6table[mifi].m6_ifp, 0); 564 } 565 } 566 } 567 bzero((caddr_t)mif6table, sizeof(mif6table)); 568 nummifs = 0; 569 570 V_pim6 = 0; /* used to stub out/in pim specific code */ 571 572 callout_stop(&expire_upcalls_ch); 573 574 /* 575 * Free all multicast forwarding cache entries. 576 */ 577 for (i = 0; i < MF6CTBLSIZ; i++) { 578 rt = mf6ctable[i]; 579 while (rt) { 580 struct mf6c *frt; 581 582 for (rte = rt->mf6c_stall; rte != NULL; ) { 583 struct rtdetq *n = rte->next; 584 585 m_free(rte->m); 586 free(rte, M_MRTABLE6); 587 rte = n; 588 } 589 frt = rt; 590 rt = rt->mf6c_next; 591 free(frt, M_MRTABLE6); 592 } 593 } 594 595 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 596 597 /* 598 * Reset register interface 599 */ 600 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 601 if_detach(multicast_register_if6); 602 if_free(multicast_register_if6); 603 reg_mif_num = (mifi_t)-1; 604 multicast_register_if6 = NULL; 605 } 606 607 ip6_mrouter = NULL; 608 V_ip6_mrouter_ver = 0; 609 610 splx(s); 611 612#ifdef MRT6DEBUG 613 if (V_mrt6debug) 614 log(LOG_DEBUG, "ip6_mrouter_done\n"); 615#endif 616 617 return (0); 618} 619 620static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 621 622/* 623 * Add a mif to the mif table 624 */ 625static int 626add_m6if(struct mif6ctl *mifcp) 627{ 628 INIT_VNET_NET(curvnet); 629 struct mif6 *mifp; 630 struct ifnet *ifp; 631 int error, s; 632 633 if (mifcp->mif6c_mifi >= MAXMIFS) 634 return (EINVAL); 635 mifp = mif6table + mifcp->mif6c_mifi; 636 if (mifp->m6_ifp) 637 return (EADDRINUSE); /* XXX: is it appropriate? */ 638 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) 639 return (ENXIO); 640 ifp = ifnet_byindex(mifcp->mif6c_pifi); 641 642 if (mifcp->mif6c_flags & MIFF_REGISTER) { 643 if (reg_mif_num == (mifi_t)-1) { 644 ifp = if_alloc(IFT_OTHER); 645 646 if_initname(ifp, "register_mif", 0); 647 ifp->if_flags |= IFF_LOOPBACK; 648 if_attach(ifp); 649 multicast_register_if6 = ifp; 650 reg_mif_num = mifcp->mif6c_mifi; 651 /* 652 * it is impossible to guess the ifindex of the 653 * register interface. So mif6c_pifi is automatically 654 * calculated. 655 */ 656 mifcp->mif6c_pifi = ifp->if_index; 657 } else { 658 ifp = multicast_register_if6; 659 } 660 661 } /* if REGISTER */ 662 else { 663 /* Make sure the interface supports multicast */ 664 if ((ifp->if_flags & IFF_MULTICAST) == 0) 665 return (EOPNOTSUPP); 666 667 s = splnet(); 668 error = if_allmulti(ifp, 1); 669 splx(s); 670 if (error) 671 return (error); 672 } 673 674 s = splnet(); 675 mifp->m6_flags = mifcp->mif6c_flags; 676 mifp->m6_ifp = ifp; 677 678 /* initialize per mif pkt counters */ 679 mifp->m6_pkt_in = 0; 680 mifp->m6_pkt_out = 0; 681 mifp->m6_bytes_in = 0; 682 mifp->m6_bytes_out = 0; 683 splx(s); 684 685 /* Adjust nummifs up if the mifi is higher than nummifs */ 686 if (nummifs <= mifcp->mif6c_mifi) 687 nummifs = mifcp->mif6c_mifi + 1; 688 689#ifdef MRT6DEBUG 690 if (V_mrt6debug) 691 log(LOG_DEBUG, 692 "add_mif #%d, phyint %s\n", 693 mifcp->mif6c_mifi, 694 ifp->if_xname); 695#endif 696 697 return (0); 698} 699 700/* 701 * Delete a mif from the mif table 702 */ 703static int 704del_m6if(mifi_t *mifip) 705{ 706 struct mif6 *mifp = mif6table + *mifip; 707 mifi_t mifi; 708 struct ifnet *ifp; 709 int s; 710 711 if (*mifip >= nummifs) 712 return (EINVAL); 713 if (mifp->m6_ifp == NULL) 714 return (EINVAL); 715 716 s = splnet(); 717 718 if (!(mifp->m6_flags & MIFF_REGISTER)) { 719 /* 720 * XXX: what if there is yet IPv4 multicast daemon 721 * using the interface? 722 */ 723 ifp = mifp->m6_ifp; 724 725 if_allmulti(ifp, 0); 726 } else { 727 if (reg_mif_num != (mifi_t)-1 && 728 multicast_register_if6 != NULL) { 729 if_detach(multicast_register_if6); 730 if_free(multicast_register_if6); 731 reg_mif_num = (mifi_t)-1; 732 multicast_register_if6 = NULL; 733 } 734 } 735 736 bzero((caddr_t)mifp, sizeof(*mifp)); 737 738 /* Adjust nummifs down */ 739 for (mifi = nummifs; mifi > 0; mifi--) 740 if (mif6table[mifi - 1].m6_ifp) 741 break; 742 nummifs = mifi; 743 744 splx(s); 745 746#ifdef MRT6DEBUG 747 if (V_mrt6debug) 748 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 749#endif 750 751 return (0); 752} 753 754/* 755 * Add an mfc entry 756 */ 757static int 758add_m6fc(struct mf6cctl *mfccp) 759{ 760 struct mf6c *rt; 761 u_long hash; 762 struct rtdetq *rte; 763 u_short nstl; 764 int s; 765 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 766 767 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 768 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 769 770 /* If an entry already exists, just update the fields */ 771 if (rt) { 772#ifdef MRT6DEBUG 773 if (V_mrt6debug & DEBUG_MFC) { 774 log(LOG_DEBUG, 775 "add_m6fc no upcall h %d o %s g %s p %x\n", 776 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 777 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 778 mfccp->mf6cc_parent); 779 } 780#endif 781 782 s = splnet(); 783 rt->mf6c_parent = mfccp->mf6cc_parent; 784 rt->mf6c_ifset = mfccp->mf6cc_ifset; 785 splx(s); 786 return (0); 787 } 788 789 /* 790 * Find the entry for which the upcall was made and update 791 */ 792 s = splnet(); 793 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 794 mfccp->mf6cc_mcastgrp.sin6_addr); 795 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 796 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 797 &mfccp->mf6cc_origin.sin6_addr) && 798 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 799 &mfccp->mf6cc_mcastgrp.sin6_addr) && 800 (rt->mf6c_stall != NULL)) { 801 802 if (nstl++) 803 log(LOG_ERR, 804 "add_m6fc: %s o %s g %s p %x dbx %p\n", 805 "multiple kernel entries", 806 ip6_sprintf(ip6bufo, 807 &mfccp->mf6cc_origin.sin6_addr), 808 ip6_sprintf(ip6bufg, 809 &mfccp->mf6cc_mcastgrp.sin6_addr), 810 mfccp->mf6cc_parent, rt->mf6c_stall); 811 812#ifdef MRT6DEBUG 813 if (V_mrt6debug & DEBUG_MFC) 814 log(LOG_DEBUG, 815 "add_m6fc o %s g %s p %x dbg %x\n", 816 ip6_sprintf(ip6bufo, 817 &mfccp->mf6cc_origin.sin6_addr), 818 ip6_sprintf(ip6bufg, 819 &mfccp->mf6cc_mcastgrp.sin6_addr), 820 mfccp->mf6cc_parent, rt->mf6c_stall); 821#endif 822 823 rt->mf6c_origin = mfccp->mf6cc_origin; 824 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 825 rt->mf6c_parent = mfccp->mf6cc_parent; 826 rt->mf6c_ifset = mfccp->mf6cc_ifset; 827 /* initialize pkt counters per src-grp */ 828 rt->mf6c_pkt_cnt = 0; 829 rt->mf6c_byte_cnt = 0; 830 rt->mf6c_wrong_if = 0; 831 832 rt->mf6c_expire = 0; /* Don't clean this guy up */ 833 n6expire[hash]--; 834 835 /* free packets Qed at the end of this entry */ 836 for (rte = rt->mf6c_stall; rte != NULL; ) { 837 struct rtdetq *n = rte->next; 838 ip6_mdq(rte->m, rte->ifp, rt); 839 m_freem(rte->m); 840#ifdef UPCALL_TIMING 841 collate(&(rte->t)); 842#endif /* UPCALL_TIMING */ 843 free(rte, M_MRTABLE6); 844 rte = n; 845 } 846 rt->mf6c_stall = NULL; 847 } 848 } 849 850 /* 851 * It is possible that an entry is being inserted without an upcall 852 */ 853 if (nstl == 0) { 854#ifdef MRT6DEBUG 855 if (V_mrt6debug & DEBUG_MFC) 856 log(LOG_DEBUG, 857 "add_mfc no upcall h %d o %s g %s p %x\n", 858 hash, 859 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 860 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 861 mfccp->mf6cc_parent); 862#endif 863 864 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 865 866 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 867 &mfccp->mf6cc_origin.sin6_addr)&& 868 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 869 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 870 871 rt->mf6c_origin = mfccp->mf6cc_origin; 872 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 873 rt->mf6c_parent = mfccp->mf6cc_parent; 874 rt->mf6c_ifset = mfccp->mf6cc_ifset; 875 /* initialize pkt counters per src-grp */ 876 rt->mf6c_pkt_cnt = 0; 877 rt->mf6c_byte_cnt = 0; 878 rt->mf6c_wrong_if = 0; 879 880 if (rt->mf6c_expire) 881 n6expire[hash]--; 882 rt->mf6c_expire = 0; 883 } 884 } 885 if (rt == NULL) { 886 /* no upcall, so make a new entry */ 887 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 888 M_NOWAIT); 889 if (rt == NULL) { 890 splx(s); 891 return (ENOBUFS); 892 } 893 894 /* insert new entry at head of hash chain */ 895 rt->mf6c_origin = mfccp->mf6cc_origin; 896 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 897 rt->mf6c_parent = mfccp->mf6cc_parent; 898 rt->mf6c_ifset = mfccp->mf6cc_ifset; 899 /* initialize pkt counters per src-grp */ 900 rt->mf6c_pkt_cnt = 0; 901 rt->mf6c_byte_cnt = 0; 902 rt->mf6c_wrong_if = 0; 903 rt->mf6c_expire = 0; 904 rt->mf6c_stall = NULL; 905 906 /* link into table */ 907 rt->mf6c_next = mf6ctable[hash]; 908 mf6ctable[hash] = rt; 909 } 910 } 911 splx(s); 912 return (0); 913} 914 915#ifdef UPCALL_TIMING 916/* 917 * collect delay statistics on the upcalls 918 */ 919static void 920collate(struct timeval *t) 921{ 922 u_long d; 923 struct timeval tp; 924 u_long delta; 925 926 GET_TIME(tp); 927 928 if (TV_LT(*t, tp)) 929 { 930 TV_DELTA(tp, *t, delta); 931 932 d = delta >> 10; 933 if (d > UPCALL_MAX) 934 d = UPCALL_MAX; 935 936 ++upcall_data[d]; 937 } 938} 939#endif /* UPCALL_TIMING */ 940 941/* 942 * Delete an mfc entry 943 */ 944static int 945del_m6fc(struct mf6cctl *mfccp) 946{ 947 struct sockaddr_in6 origin; 948 struct sockaddr_in6 mcastgrp; 949 struct mf6c *rt; 950 struct mf6c **nptr; 951 u_long hash; 952 int s; 953 954 origin = mfccp->mf6cc_origin; 955 mcastgrp = mfccp->mf6cc_mcastgrp; 956 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 957 958#ifdef MRT6DEBUG 959 if (V_mrt6debug & DEBUG_MFC) { 960 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 961 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 962 ip6_sprintf(ip6bufo, &origin.sin6_addr), 963 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 964 } 965#endif 966 967 s = splnet(); 968 969 nptr = &mf6ctable[hash]; 970 while ((rt = *nptr) != NULL) { 971 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 972 &rt->mf6c_origin.sin6_addr) && 973 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 974 &rt->mf6c_mcastgrp.sin6_addr) && 975 rt->mf6c_stall == NULL) 976 break; 977 978 nptr = &rt->mf6c_next; 979 } 980 if (rt == NULL) { 981 splx(s); 982 return (EADDRNOTAVAIL); 983 } 984 985 *nptr = rt->mf6c_next; 986 free(rt, M_MRTABLE6); 987 988 splx(s); 989 990 return (0); 991} 992 993static int 994socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 995{ 996 997 if (s) { 998 if (sbappendaddr(&s->so_rcv, 999 (struct sockaddr *)src, 1000 mm, (struct mbuf *)0) != 0) { 1001 sorwakeup(s); 1002 return (0); 1003 } 1004 } 1005 m_freem(mm); 1006 return (-1); 1007} 1008 1009/* 1010 * IPv6 multicast forwarding function. This function assumes that the packet 1011 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1012 * pointed to by "ifp", and the packet is to be relayed to other networks 1013 * that have members of the packet's destination IPv6 multicast group. 1014 * 1015 * The packet is returned unscathed to the caller, unless it is 1016 * erroneous, in which case a non-zero return value tells the caller to 1017 * discard it. 1018 * 1019 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1020 * this function is called in the originating context (i.e., not when 1021 * forwarding a packet from other node). ip6_output(), which is currently the 1022 * only function that calls this function is called in the originating context, 1023 * explicitly ensures this condition. It is caller's responsibility to ensure 1024 * that if this function is called from somewhere else in the originating 1025 * context in the future. 1026 */ 1027int 1028X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1029{ 1030 INIT_VNET_INET6(curvnet); 1031 struct mf6c *rt; 1032 struct mif6 *mifp; 1033 struct mbuf *mm; 1034 int s; 1035 mifi_t mifi; 1036 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1037 1038#ifdef MRT6DEBUG 1039 if (V_mrt6debug & DEBUG_FORWARD) 1040 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1041 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1042 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1043 ifp->if_index); 1044#endif 1045 1046 /* 1047 * Don't forward a packet with Hop limit of zero or one, 1048 * or a packet destined to a local-only group. 1049 */ 1050 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1051 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1052 return (0); 1053 ip6->ip6_hlim--; 1054 1055 /* 1056 * Source address check: do not forward packets with unspecified 1057 * source. It was discussed in July 2000, on ipngwg mailing list. 1058 * This is rather more serious than unicast cases, because some 1059 * MLD packets can be sent with the unspecified source address 1060 * (although such packets must normally set 1 to the hop limit field). 1061 */ 1062 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1063 V_ip6stat.ip6s_cantforward++; 1064 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1065 V_ip6_log_time = time_second; 1066 log(LOG_DEBUG, 1067 "cannot forward " 1068 "from %s to %s nxt %d received on %s\n", 1069 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1070 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1071 ip6->ip6_nxt, 1072 if_name(m->m_pkthdr.rcvif)); 1073 } 1074 return (0); 1075 } 1076 1077 /* 1078 * Determine forwarding mifs from the forwarding cache table 1079 */ 1080 s = splnet(); 1081 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1082 1083 /* Entry exists, so forward if necessary */ 1084 if (rt) { 1085 splx(s); 1086 return (ip6_mdq(m, ifp, rt)); 1087 } else { 1088 /* 1089 * If we don't have a route for packet's origin, 1090 * Make a copy of the packet & 1091 * send message to routing daemon 1092 */ 1093 1094 struct mbuf *mb0; 1095 struct rtdetq *rte; 1096 u_long hash; 1097/* int i, npkts;*/ 1098#ifdef UPCALL_TIMING 1099 struct timeval tp; 1100 1101 GET_TIME(tp); 1102#endif /* UPCALL_TIMING */ 1103 1104 mrt6stat.mrt6s_no_route++; 1105#ifdef MRT6DEBUG 1106 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1107 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1108 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1109 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1110#endif 1111 1112 /* 1113 * Allocate mbufs early so that we don't do extra work if we 1114 * are just going to fail anyway. 1115 */ 1116 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1117 M_NOWAIT); 1118 if (rte == NULL) { 1119 splx(s); 1120 return (ENOBUFS); 1121 } 1122 mb0 = m_copy(m, 0, M_COPYALL); 1123 /* 1124 * Pullup packet header if needed before storing it, 1125 * as other references may modify it in the meantime. 1126 */ 1127 if (mb0 && 1128 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1129 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1130 if (mb0 == NULL) { 1131 free(rte, M_MRTABLE6); 1132 splx(s); 1133 return (ENOBUFS); 1134 } 1135 1136 /* is there an upcall waiting for this packet? */ 1137 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1138 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1139 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1140 &rt->mf6c_origin.sin6_addr) && 1141 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1142 &rt->mf6c_mcastgrp.sin6_addr) && 1143 (rt->mf6c_stall != NULL)) 1144 break; 1145 } 1146 1147 if (rt == NULL) { 1148 struct mrt6msg *im; 1149#ifdef MRT6_OINIT 1150 struct omrt6msg *oim; 1151#endif 1152 1153 /* no upcall, so make a new entry */ 1154 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1155 M_NOWAIT); 1156 if (rt == NULL) { 1157 free(rte, M_MRTABLE6); 1158 m_freem(mb0); 1159 splx(s); 1160 return (ENOBUFS); 1161 } 1162 /* 1163 * Make a copy of the header to send to the user 1164 * level process 1165 */ 1166 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1167 1168 if (mm == NULL) { 1169 free(rte, M_MRTABLE6); 1170 m_freem(mb0); 1171 free(rt, M_MRTABLE6); 1172 splx(s); 1173 return (ENOBUFS); 1174 } 1175 1176 /* 1177 * Send message to routing daemon 1178 */ 1179 sin6.sin6_addr = ip6->ip6_src; 1180 1181 im = NULL; 1182#ifdef MRT6_OINIT 1183 oim = NULL; 1184#endif 1185 switch (V_ip6_mrouter_ver) { 1186#ifdef MRT6_OINIT 1187 case MRT6_OINIT: 1188 oim = mtod(mm, struct omrt6msg *); 1189 oim->im6_msgtype = MRT6MSG_NOCACHE; 1190 oim->im6_mbz = 0; 1191 break; 1192#endif 1193 case MRT6_INIT: 1194 im = mtod(mm, struct mrt6msg *); 1195 im->im6_msgtype = MRT6MSG_NOCACHE; 1196 im->im6_mbz = 0; 1197 break; 1198 default: 1199 free(rte, M_MRTABLE6); 1200 m_freem(mb0); 1201 free(rt, M_MRTABLE6); 1202 splx(s); 1203 return (EINVAL); 1204 } 1205 1206#ifdef MRT6DEBUG 1207 if (V_mrt6debug & DEBUG_FORWARD) 1208 log(LOG_DEBUG, 1209 "getting the iif info in the kernel\n"); 1210#endif 1211 1212 for (mifp = mif6table, mifi = 0; 1213 mifi < nummifs && mifp->m6_ifp != ifp; 1214 mifp++, mifi++) 1215 ; 1216 1217 switch (V_ip6_mrouter_ver) { 1218#ifdef MRT6_OINIT 1219 case MRT6_OINIT: 1220 oim->im6_mif = mifi; 1221 break; 1222#endif 1223 case MRT6_INIT: 1224 im->im6_mif = mifi; 1225 break; 1226 } 1227 1228 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1229 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1230 "socket queue full\n"); 1231 mrt6stat.mrt6s_upq_sockfull++; 1232 free(rte, M_MRTABLE6); 1233 m_freem(mb0); 1234 free(rt, M_MRTABLE6); 1235 splx(s); 1236 return (ENOBUFS); 1237 } 1238 1239 mrt6stat.mrt6s_upcalls++; 1240 1241 /* insert new entry at head of hash chain */ 1242 bzero(rt, sizeof(*rt)); 1243 rt->mf6c_origin.sin6_family = AF_INET6; 1244 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1245 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1246 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1247 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1248 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1249 rt->mf6c_expire = UPCALL_EXPIRE; 1250 n6expire[hash]++; 1251 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1252 1253 /* link into table */ 1254 rt->mf6c_next = mf6ctable[hash]; 1255 mf6ctable[hash] = rt; 1256 /* Add this entry to the end of the queue */ 1257 rt->mf6c_stall = rte; 1258 } else { 1259 /* determine if q has overflowed */ 1260 struct rtdetq **p; 1261 int npkts = 0; 1262 1263 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1264 if (++npkts > MAX_UPQ6) { 1265 mrt6stat.mrt6s_upq_ovflw++; 1266 free(rte, M_MRTABLE6); 1267 m_freem(mb0); 1268 splx(s); 1269 return (0); 1270 } 1271 1272 /* Add this entry to the end of the queue */ 1273 *p = rte; 1274 } 1275 1276 rte->next = NULL; 1277 rte->m = mb0; 1278 rte->ifp = ifp; 1279#ifdef UPCALL_TIMING 1280 rte->t = tp; 1281#endif /* UPCALL_TIMING */ 1282 1283 splx(s); 1284 1285 return (0); 1286 } 1287} 1288 1289/* 1290 * Clean up cache entries if upcalls are not serviced 1291 * Call from the Slow Timeout mechanism, every half second. 1292 */ 1293static void 1294expire_upcalls(void *unused) 1295{ 1296 struct rtdetq *rte; 1297 struct mf6c *mfc, **nptr; 1298 int i; 1299 int s; 1300 1301 s = splnet(); 1302 for (i = 0; i < MF6CTBLSIZ; i++) { 1303 if (n6expire[i] == 0) 1304 continue; 1305 nptr = &mf6ctable[i]; 1306 while ((mfc = *nptr) != NULL) { 1307 rte = mfc->mf6c_stall; 1308 /* 1309 * Skip real cache entries 1310 * Make sure it wasn't marked to not expire (shouldn't happen) 1311 * If it expires now 1312 */ 1313 if (rte != NULL && 1314 mfc->mf6c_expire != 0 && 1315 --mfc->mf6c_expire == 0) { 1316#ifdef MRT6DEBUG 1317 if (V_mrt6debug & DEBUG_EXPIRE) { 1318 char ip6bufo[INET6_ADDRSTRLEN]; 1319 char ip6bufg[INET6_ADDRSTRLEN]; 1320 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1321 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1322 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1323 } 1324#endif 1325 /* 1326 * drop all the packets 1327 * free the mbuf with the pkt, if, timing info 1328 */ 1329 do { 1330 struct rtdetq *n = rte->next; 1331 m_freem(rte->m); 1332 free(rte, M_MRTABLE6); 1333 rte = n; 1334 } while (rte != NULL); 1335 mrt6stat.mrt6s_cache_cleanups++; 1336 n6expire[i]--; 1337 1338 *nptr = mfc->mf6c_next; 1339 free(mfc, M_MRTABLE6); 1340 } else { 1341 nptr = &mfc->mf6c_next; 1342 } 1343 } 1344 } 1345 splx(s); 1346 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1347 expire_upcalls, NULL); 1348} 1349 1350/* 1351 * Packet forwarding routine once entry in the cache is made 1352 */ 1353static int 1354ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1355{ 1356 INIT_VNET_INET6(curvnet); 1357 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1358 mifi_t mifi, iif; 1359 struct mif6 *mifp; 1360 int plen = m->m_pkthdr.len; 1361 struct in6_addr src0, dst0; /* copies for local work */ 1362 u_int32_t iszone, idzone, oszone, odzone; 1363 int error = 0; 1364 1365/* 1366 * Macro to send packet on mif. Since RSVP packets don't get counted on 1367 * input, they shouldn't get counted on output, so statistics keeping is 1368 * separate. 1369 */ 1370 1371#define MC6_SEND(ip6, mifp, m) do { \ 1372 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1373 register_send((ip6), (mifp), (m)); \ 1374 else \ 1375 phyint_send((ip6), (mifp), (m)); \ 1376} while (/*CONSTCOND*/ 0) 1377 1378 /* 1379 * Don't forward if it didn't arrive from the parent mif 1380 * for its origin. 1381 */ 1382 mifi = rt->mf6c_parent; 1383 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1384 /* came in the wrong interface */ 1385#ifdef MRT6DEBUG 1386 if (V_mrt6debug & DEBUG_FORWARD) 1387 log(LOG_DEBUG, 1388 "wrong if: ifid %d mifi %d mififid %x\n", 1389 ifp->if_index, mifi, 1390 mif6table[mifi].m6_ifp->if_index); 1391#endif 1392 mrt6stat.mrt6s_wrong_if++; 1393 rt->mf6c_wrong_if++; 1394 /* 1395 * If we are doing PIM processing, and we are forwarding 1396 * packets on this interface, send a message to the 1397 * routing daemon. 1398 */ 1399 /* have to make sure this is a valid mif */ 1400 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1401 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1402 /* 1403 * Check the M_LOOP flag to avoid an 1404 * unnecessary PIM assert. 1405 * XXX: M_LOOP is an ad-hoc hack... 1406 */ 1407 static struct sockaddr_in6 sin6 = 1408 { sizeof(sin6), AF_INET6 }; 1409 1410 struct mbuf *mm; 1411 struct mrt6msg *im; 1412#ifdef MRT6_OINIT 1413 struct omrt6msg *oim; 1414#endif 1415 1416 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1417 if (mm && 1418 (M_HASCL(mm) || 1419 mm->m_len < sizeof(struct ip6_hdr))) 1420 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1421 if (mm == NULL) 1422 return (ENOBUFS); 1423 1424#ifdef MRT6_OINIT 1425 oim = NULL; 1426#endif 1427 im = NULL; 1428 switch (V_ip6_mrouter_ver) { 1429#ifdef MRT6_OINIT 1430 case MRT6_OINIT: 1431 oim = mtod(mm, struct omrt6msg *); 1432 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1433 oim->im6_mbz = 0; 1434 break; 1435#endif 1436 case MRT6_INIT: 1437 im = mtod(mm, struct mrt6msg *); 1438 im->im6_msgtype = MRT6MSG_WRONGMIF; 1439 im->im6_mbz = 0; 1440 break; 1441 default: 1442 m_freem(mm); 1443 return (EINVAL); 1444 } 1445 1446 for (mifp = mif6table, iif = 0; 1447 iif < nummifs && mifp && 1448 mifp->m6_ifp != ifp; 1449 mifp++, iif++) 1450 ; 1451 1452 switch (V_ip6_mrouter_ver) { 1453#ifdef MRT6_OINIT 1454 case MRT6_OINIT: 1455 oim->im6_mif = iif; 1456 sin6.sin6_addr = oim->im6_src; 1457 break; 1458#endif 1459 case MRT6_INIT: 1460 im->im6_mif = iif; 1461 sin6.sin6_addr = im->im6_src; 1462 break; 1463 } 1464 1465 mrt6stat.mrt6s_upcalls++; 1466 1467 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1468#ifdef MRT6DEBUG 1469 if (V_mrt6debug) 1470 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1471#endif 1472 ++mrt6stat.mrt6s_upq_sockfull; 1473 return (ENOBUFS); 1474 } /* if socket Q full */ 1475 } /* if PIM */ 1476 return (0); 1477 } /* if wrong iif */ 1478 1479 /* If I sourced this packet, it counts as output, else it was input. */ 1480 if (m->m_pkthdr.rcvif == NULL) { 1481 /* XXX: is rcvif really NULL when output?? */ 1482 mif6table[mifi].m6_pkt_out++; 1483 mif6table[mifi].m6_bytes_out += plen; 1484 } else { 1485 mif6table[mifi].m6_pkt_in++; 1486 mif6table[mifi].m6_bytes_in += plen; 1487 } 1488 rt->mf6c_pkt_cnt++; 1489 rt->mf6c_byte_cnt += plen; 1490 1491 /* 1492 * For each mif, forward a copy of the packet if there are group 1493 * members downstream on the interface. 1494 */ 1495 src0 = ip6->ip6_src; 1496 dst0 = ip6->ip6_dst; 1497 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1498 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1499 V_ip6stat.ip6s_badscope++; 1500 return (error); 1501 } 1502 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1503 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1504 /* 1505 * check if the outgoing packet is going to break 1506 * a scope boundary. 1507 * XXX For packets through PIM register tunnel 1508 * interface, we believe a routing daemon. 1509 */ 1510 if (!(mif6table[rt->mf6c_parent].m6_flags & 1511 MIFF_REGISTER) && 1512 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1513 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1514 &oszone) || 1515 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1516 &odzone) || 1517 iszone != oszone || 1518 idzone != odzone) { 1519 V_ip6stat.ip6s_badscope++; 1520 continue; 1521 } 1522 } 1523 1524 mifp->m6_pkt_out++; 1525 mifp->m6_bytes_out += plen; 1526 MC6_SEND(ip6, mifp, m); 1527 } 1528 } 1529 return (0); 1530} 1531 1532static void 1533phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1534{ 1535 INIT_VNET_INET6(curvnet); 1536 struct mbuf *mb_copy; 1537 struct ifnet *ifp = mifp->m6_ifp; 1538 int error = 0; 1539 int s = splnet(); /* needs to protect static "ro" below. */ 1540 static struct route_in6 ro; 1541 struct in6_multi *in6m; 1542 struct sockaddr_in6 *dst6; 1543 u_long linkmtu; 1544 1545 /* 1546 * Make a new reference to the packet; make sure that 1547 * the IPv6 header is actually copied, not just referenced, 1548 * so that ip6_output() only scribbles on the copy. 1549 */ 1550 mb_copy = m_copy(m, 0, M_COPYALL); 1551 if (mb_copy && 1552 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1553 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1554 if (mb_copy == NULL) { 1555 splx(s); 1556 return; 1557 } 1558 /* set MCAST flag to the outgoing packet */ 1559 mb_copy->m_flags |= M_MCAST; 1560 1561 /* 1562 * If we sourced the packet, call ip6_output since we may devide 1563 * the packet into fragments when the packet is too big for the 1564 * outgoing interface. 1565 * Otherwise, we can simply send the packet to the interface 1566 * sending queue. 1567 */ 1568 if (m->m_pkthdr.rcvif == NULL) { 1569 struct ip6_moptions im6o; 1570 1571 im6o.im6o_multicast_ifp = ifp; 1572 /* XXX: ip6_output will override ip6->ip6_hlim */ 1573 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1574 im6o.im6o_multicast_loop = 1; 1575 error = ip6_output(mb_copy, NULL, &ro, 1576 IPV6_FORWARDING, &im6o, NULL, NULL); 1577 1578#ifdef MRT6DEBUG 1579 if (V_mrt6debug & DEBUG_XMIT) 1580 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1581 mifp - mif6table, error); 1582#endif 1583 splx(s); 1584 return; 1585 } 1586 1587 /* 1588 * If we belong to the destination multicast group 1589 * on the outgoing interface, loop back a copy. 1590 */ 1591 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1592 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1593 if (in6m != NULL) { 1594 dst6->sin6_len = sizeof(struct sockaddr_in6); 1595 dst6->sin6_family = AF_INET6; 1596 dst6->sin6_addr = ip6->ip6_dst; 1597 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1598 } 1599 /* 1600 * Put the packet into the sending queue of the outgoing interface 1601 * if it would fit in the MTU of the interface. 1602 */ 1603 linkmtu = IN6_LINKMTU(ifp); 1604 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1605 dst6->sin6_len = sizeof(struct sockaddr_in6); 1606 dst6->sin6_family = AF_INET6; 1607 dst6->sin6_addr = ip6->ip6_dst; 1608 /* 1609 * We just call if_output instead of nd6_output here, since 1610 * we need no ND for a multicast forwarded packet...right? 1611 */ 1612 error = (*ifp->if_output)(ifp, mb_copy, 1613 (struct sockaddr *)&ro.ro_dst, NULL); 1614#ifdef MRT6DEBUG 1615 if (V_mrt6debug & DEBUG_XMIT) 1616 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1617 mifp - mif6table, error); 1618#endif 1619 } else { 1620 /* 1621 * pMTU discovery is intentionally disabled by default, since 1622 * various router may notify pMTU in multicast, which can be 1623 * a DDoS to a router 1624 */ 1625 if (V_ip6_mcast_pmtu) 1626 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1627 else { 1628#ifdef MRT6DEBUG 1629 if (V_mrt6debug & DEBUG_XMIT) { 1630 char ip6bufs[INET6_ADDRSTRLEN]; 1631 char ip6bufd[INET6_ADDRSTRLEN]; 1632 log(LOG_DEBUG, 1633 "phyint_send: packet too big on %s o %s " 1634 "g %s size %d(discarded)\n", 1635 if_name(ifp), 1636 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1637 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1638 mb_copy->m_pkthdr.len); 1639 } 1640#endif /* MRT6DEBUG */ 1641 m_freem(mb_copy); /* simply discard the packet */ 1642 } 1643 } 1644 1645 splx(s); 1646} 1647 1648static int 1649register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1650{ 1651 struct mbuf *mm; 1652 int i, len = m->m_pkthdr.len; 1653 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1654 struct mrt6msg *im6; 1655 1656#ifdef MRT6DEBUG 1657 if (V_mrt6debug) { 1658 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1659 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1660 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1661 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1662 } 1663#endif 1664 ++pim6stat.pim6s_snd_registers; 1665 1666 /* Make a copy of the packet to send to the user level process */ 1667 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1668 if (mm == NULL) 1669 return (ENOBUFS); 1670 mm->m_pkthdr.rcvif = NULL; 1671 mm->m_data += max_linkhdr; 1672 mm->m_len = sizeof(struct ip6_hdr); 1673 1674 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1675 m_freem(mm); 1676 return (ENOBUFS); 1677 } 1678 i = MHLEN - M_LEADINGSPACE(mm); 1679 if (i > len) 1680 i = len; 1681 mm = m_pullup(mm, i); 1682 if (mm == NULL) 1683 return (ENOBUFS); 1684/* TODO: check it! */ 1685 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1686 1687 /* 1688 * Send message to routing daemon 1689 */ 1690 sin6.sin6_addr = ip6->ip6_src; 1691 1692 im6 = mtod(mm, struct mrt6msg *); 1693 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1694 im6->im6_mbz = 0; 1695 1696 im6->im6_mif = mif - mif6table; 1697 1698 /* iif info is not given for reg. encap.n */ 1699 mrt6stat.mrt6s_upcalls++; 1700 1701 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1702#ifdef MRT6DEBUG 1703 if (V_mrt6debug) 1704 log(LOG_WARNING, 1705 "register_send: ip6_mrouter socket queue full\n"); 1706#endif 1707 ++mrt6stat.mrt6s_upq_sockfull; 1708 return (ENOBUFS); 1709 } 1710 return (0); 1711} 1712 1713/* 1714 * PIM sparse mode hook 1715 * Receives the pim control messages, and passes them up to the listening 1716 * socket, using rip6_input. 1717 * The only message processed is the REGISTER pim message; the pim header 1718 * is stripped off, and the inner packet is passed to register_mforward. 1719 */ 1720int 1721pim6_input(struct mbuf **mp, int *offp, int proto) 1722{ 1723 INIT_VNET_INET6(curvnet); 1724 struct pim *pim; /* pointer to a pim struct */ 1725 struct ip6_hdr *ip6; 1726 int pimlen; 1727 struct mbuf *m = *mp; 1728 int minlen; 1729 int off = *offp; 1730 1731 ++pim6stat.pim6s_rcv_total; 1732 1733 ip6 = mtod(m, struct ip6_hdr *); 1734 pimlen = m->m_pkthdr.len - *offp; 1735 1736 /* 1737 * Validate lengths 1738 */ 1739 if (pimlen < PIM_MINLEN) { 1740 ++pim6stat.pim6s_rcv_tooshort; 1741#ifdef MRT6DEBUG 1742 if (V_mrt6debug & DEBUG_PIM) 1743 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1744#endif 1745 m_freem(m); 1746 return (IPPROTO_DONE); 1747 } 1748 1749 /* 1750 * if the packet is at least as big as a REGISTER, go ahead 1751 * and grab the PIM REGISTER header size, to avoid another 1752 * possible m_pullup() later. 1753 * 1754 * PIM_MINLEN == pimhdr + u_int32 == 8 1755 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1756 */ 1757 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1758 1759 /* 1760 * Make sure that the IP6 and PIM headers in contiguous memory, and 1761 * possibly the PIM REGISTER header 1762 */ 1763#ifndef PULLDOWN_TEST 1764 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1765 /* adjust pointer */ 1766 ip6 = mtod(m, struct ip6_hdr *); 1767 1768 /* adjust mbuf to point to the PIM header */ 1769 pim = (struct pim *)((caddr_t)ip6 + off); 1770#else 1771 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1772 if (pim == NULL) { 1773 pim6stat.pim6s_rcv_tooshort++; 1774 return (IPPROTO_DONE); 1775 } 1776#endif 1777 1778#define PIM6_CHECKSUM 1779#ifdef PIM6_CHECKSUM 1780 { 1781 int cksumlen; 1782 1783 /* 1784 * Validate checksum. 1785 * If PIM REGISTER, exclude the data packet 1786 */ 1787 if (pim->pim_type == PIM_REGISTER) 1788 cksumlen = PIM_MINLEN; 1789 else 1790 cksumlen = pimlen; 1791 1792 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1793 ++pim6stat.pim6s_rcv_badsum; 1794#ifdef MRT6DEBUG 1795 if (V_mrt6debug & DEBUG_PIM) 1796 log(LOG_DEBUG, 1797 "pim6_input: invalid checksum\n"); 1798#endif 1799 m_freem(m); 1800 return (IPPROTO_DONE); 1801 } 1802 } 1803#endif /* PIM_CHECKSUM */ 1804 1805 /* PIM version check */ 1806 if (pim->pim_ver != PIM_VERSION) { 1807 ++pim6stat.pim6s_rcv_badversion; 1808#ifdef MRT6DEBUG 1809 log(LOG_ERR, 1810 "pim6_input: incorrect version %d, expecting %d\n", 1811 pim->pim_ver, PIM_VERSION); 1812#endif 1813 m_freem(m); 1814 return (IPPROTO_DONE); 1815 } 1816 1817 if (pim->pim_type == PIM_REGISTER) { 1818 /* 1819 * since this is a REGISTER, we'll make a copy of the register 1820 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1821 * routing daemon. 1822 */ 1823 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1824 1825 struct mbuf *mcp; 1826 struct ip6_hdr *eip6; 1827 u_int32_t *reghdr; 1828 int rc; 1829#ifdef MRT6DEBUG 1830 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1831#endif 1832 1833 ++pim6stat.pim6s_rcv_registers; 1834 1835 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1836#ifdef MRT6DEBUG 1837 if (V_mrt6debug & DEBUG_PIM) 1838 log(LOG_DEBUG, 1839 "pim6_input: register mif not set: %d\n", 1840 reg_mif_num); 1841#endif 1842 m_freem(m); 1843 return (IPPROTO_DONE); 1844 } 1845 1846 reghdr = (u_int32_t *)(pim + 1); 1847 1848 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1849 goto pim6_input_to_daemon; 1850 1851 /* 1852 * Validate length 1853 */ 1854 if (pimlen < PIM6_REG_MINLEN) { 1855 ++pim6stat.pim6s_rcv_tooshort; 1856 ++pim6stat.pim6s_rcv_badregisters; 1857#ifdef MRT6DEBUG 1858 log(LOG_ERR, 1859 "pim6_input: register packet size too " 1860 "small %d from %s\n", 1861 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1862#endif 1863 m_freem(m); 1864 return (IPPROTO_DONE); 1865 } 1866 1867 eip6 = (struct ip6_hdr *) (reghdr + 1); 1868#ifdef MRT6DEBUG 1869 if (V_mrt6debug & DEBUG_PIM) 1870 log(LOG_DEBUG, 1871 "pim6_input[register], eip6: %s -> %s, " 1872 "eip6 plen %d\n", 1873 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1874 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1875 ntohs(eip6->ip6_plen)); 1876#endif 1877 1878 /* verify the version number of the inner packet */ 1879 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1880 ++pim6stat.pim6s_rcv_badregisters; 1881#ifdef MRT6DEBUG 1882 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1883 "of the inner packet\n", 1884 (eip6->ip6_vfc & IPV6_VERSION)); 1885#endif 1886 m_freem(m); 1887 return (IPPROTO_NONE); 1888 } 1889 1890 /* verify the inner packet is destined to a mcast group */ 1891 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1892 ++pim6stat.pim6s_rcv_badregisters; 1893#ifdef MRT6DEBUG 1894 if (V_mrt6debug & DEBUG_PIM) 1895 log(LOG_DEBUG, 1896 "pim6_input: inner packet of register " 1897 "is not multicast %s\n", 1898 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1899#endif 1900 m_freem(m); 1901 return (IPPROTO_DONE); 1902 } 1903 1904 /* 1905 * make a copy of the whole header to pass to the daemon later. 1906 */ 1907 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1908 if (mcp == NULL) { 1909#ifdef MRT6DEBUG 1910 log(LOG_ERR, 1911 "pim6_input: pim register: " 1912 "could not copy register head\n"); 1913#endif 1914 m_freem(m); 1915 return (IPPROTO_DONE); 1916 } 1917 1918 /* 1919 * forward the inner ip6 packet; point m_data at the inner ip6. 1920 */ 1921 m_adj(m, off + PIM_MINLEN); 1922#ifdef MRT6DEBUG 1923 if (V_mrt6debug & DEBUG_PIM) { 1924 log(LOG_DEBUG, 1925 "pim6_input: forwarding decapsulated register: " 1926 "src %s, dst %s, mif %d\n", 1927 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1928 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1929 reg_mif_num); 1930 } 1931#endif 1932 1933 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1934 dst.sin6_family, 0); 1935 1936 /* prepare the register head to send to the mrouting daemon */ 1937 m = mcp; 1938 } 1939 1940 /* 1941 * Pass the PIM message up to the daemon; if it is a register message 1942 * pass the 'head' only up to the daemon. This includes the 1943 * encapsulator ip6 header, pim header, register header and the 1944 * encapsulated ip6 header. 1945 */ 1946 pim6_input_to_daemon: 1947 rip6_input(&m, offp, proto); 1948 return (IPPROTO_DONE); 1949} 1950