ip6_mroute.c revision 185571
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 185571 2008-12-02 21:37:28Z bz $"); 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#include <net/vnet.h> 111 112#include <netinet/in.h> 113#include <netinet/in_var.h> 114#include <netinet/icmp6.h> 115#include <netinet/vinet.h> 116 117#include <netinet/ip6.h> 118#include <netinet6/ip6_var.h> 119#include <netinet6/scope6_var.h> 120#include <netinet6/nd6.h> 121#include <netinet6/ip6_mroute.h> 122#include <netinet6/ip6protosw.h> 123#include <netinet6/pim6.h> 124#include <netinet6/pim6_var.h> 125#include <netinet6/vinet6.h> 126 127static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 128 129/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 130#define M_HASCL(m) ((m)->m_flags & M_EXT) 131 132static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 133static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 134 135static void pim6_init(void); 136static int set_pim6(int *); 137static int socket_send __P((struct socket *, struct mbuf *, 138 struct sockaddr_in6 *)); 139static int register_send __P((struct ip6_hdr *, struct mif6 *, 140 struct mbuf *)); 141 142extern struct domain inet6domain; 143 144/* XXX: referenced from ip_mroute.c for dynamically loading this code. */ 145struct ip6protosw in6_pim_protosw = { 146 .pr_type = SOCK_RAW, 147 .pr_domain = &inet6domain, 148 .pr_protocol = IPPROTO_PIM, 149 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 150 .pr_input = pim6_input, 151 .pr_output = rip6_output, 152 .pr_ctloutput = rip6_ctloutput, 153 .pr_init = pim6_init, 154 .pr_usrreqs = &rip6_usrreqs 155}; 156 157#ifdef VIMAGE_GLOBALS 158static int ip6_mrouter_ver; 159#endif 160 161SYSCTL_DECL(_net_inet6); 162SYSCTL_DECL(_net_inet6_ip6); 163SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 164 165static struct mrt6stat mrt6stat; 166SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 167 &mrt6stat, mrt6stat, 168 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 169 170#define NO_RTE_FOUND 0x1 171#define RTE_FOUND 0x2 172 173static struct mf6c *mf6ctable[MF6CTBLSIZ]; 174SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 175 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 176 "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 177 "netinet6/ip6_mroute.h)"); 178 179static u_char n6expire[MF6CTBLSIZ]; 180 181static struct mif6 mif6table[MAXMIFS]; 182SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 183 &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]", 184 "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)"); 185 186#ifdef MRT6DEBUG 187#ifdef VIMAGE_GLOBALS 188static u_int mrt6debug = 0; /* debug level */ 189#endif 190#define DEBUG_MFC 0x02 191#define DEBUG_FORWARD 0x04 192#define DEBUG_EXPIRE 0x08 193#define DEBUG_XMIT 0x10 194#define DEBUG_REG 0x20 195#define DEBUG_PIM 0x40 196#endif 197 198static void expire_upcalls(void *); 199#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 200#define UPCALL_EXPIRE 6 /* number of timeouts */ 201 202#ifdef INET 203#ifdef MROUTING 204extern struct socket *ip_mrouter; 205#endif 206#endif 207 208/* 209 * 'Interfaces' associated with decapsulator (so we can tell 210 * packets that went through it from ones that get reflected 211 * by a broken gateway). Different from IPv4 register_if, 212 * these interfaces are linked into the system ifnet list, 213 * because per-interface IPv6 statistics are maintained in 214 * ifp->if_afdata. But it does not have any routes point 215 * to them. I.e., packets can't be sent this way. They 216 * only exist as a placeholder for multicast source 217 * verification. 218 */ 219static struct ifnet *multicast_register_if6; 220 221#define ENCAP_HOPS 64 222 223/* 224 * Private variables. 225 */ 226static mifi_t nummifs = 0; 227static mifi_t reg_mif_num = (mifi_t)-1; 228 229static struct pim6stat pim6stat; 230SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 231 &pim6stat, pim6stat, 232 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 233 234#ifdef VIMAGE_GLOBALS 235static int pim6; 236#endif 237 238/* 239 * Hash function for a source, group entry 240 */ 241#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 242 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 243 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 244 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 245 246/* 247 * Find a route for a given origin IPv6 address and Multicast group address. 248 */ 249#define MF6CFIND(o, g, rt) do { \ 250 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 251 rt = NULL; \ 252 mrt6stat.mrt6s_mfc_lookups++; \ 253 while (_rt) { \ 254 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 255 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 256 (_rt->mf6c_stall == NULL)) { \ 257 rt = _rt; \ 258 break; \ 259 } \ 260 _rt = _rt->mf6c_next; \ 261 } \ 262 if (rt == NULL) { \ 263 mrt6stat.mrt6s_mfc_misses++; \ 264 } \ 265} while (/*CONSTCOND*/ 0) 266 267/* 268 * Macros to compute elapsed time efficiently 269 * Borrowed from Van Jacobson's scheduling code 270 * XXX: replace with timersub() ? 271 */ 272#define TV_DELTA(a, b, delta) do { \ 273 int xxs; \ 274 \ 275 delta = (a).tv_usec - (b).tv_usec; \ 276 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 277 switch (xxs) { \ 278 case 2: \ 279 delta += 1000000; \ 280 /* FALLTHROUGH */ \ 281 case 1: \ 282 delta += 1000000; \ 283 break; \ 284 default: \ 285 delta += (1000000 * xxs); \ 286 } \ 287 } \ 288} while (/*CONSTCOND*/ 0) 289 290/* XXX: replace with timercmp(a, b, <) ? */ 291#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 292 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 293 294#ifdef UPCALL_TIMING 295#define UPCALL_MAX 50 296static u_long upcall_data[UPCALL_MAX + 1]; 297static void collate(); 298#endif /* UPCALL_TIMING */ 299 300static int get_sg_cnt(struct sioc_sg_req6 *); 301static int get_mif6_cnt(struct sioc_mif_req6 *); 302static int ip6_mrouter_init(struct socket *, int, int); 303static int add_m6if(struct mif6ctl *); 304static int del_m6if(mifi_t *); 305static int add_m6fc(struct mf6cctl *); 306static int del_m6fc(struct mf6cctl *); 307 308static struct callout expire_upcalls_ch; 309 310int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m); 311int X_ip6_mrouter_done(void); 312int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt); 313int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt); 314int X_mrt6_ioctl(int cmd, caddr_t data); 315 316static void 317pim6_init(void) 318{ 319 INIT_VNET_INET6(curvnet); 320 321 V_ip6_mrouter_ver = 0; 322#ifdef MRT6DEBUG 323 V_mrt6debug = 0; /* debug level */ 324#endif 325} 326 327/* 328 * Handle MRT setsockopt commands to modify the multicast routing tables. 329 */ 330int 331X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 332{ 333 int error = 0; 334 int optval; 335 struct mif6ctl mifc; 336 struct mf6cctl mfcc; 337 mifi_t mifi; 338 339 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 340 return (EACCES); 341 342 switch (sopt->sopt_name) { 343 case MRT6_INIT: 344#ifdef MRT6_OINIT 345 case MRT6_OINIT: 346#endif 347 error = sooptcopyin(sopt, &optval, sizeof(optval), 348 sizeof(optval)); 349 if (error) 350 break; 351 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 352 break; 353 case MRT6_DONE: 354 error = X_ip6_mrouter_done(); 355 break; 356 case MRT6_ADD_MIF: 357 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 358 if (error) 359 break; 360 error = add_m6if(&mifc); 361 break; 362 case MRT6_ADD_MFC: 363 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 364 if (error) 365 break; 366 error = add_m6fc(&mfcc); 367 break; 368 case MRT6_DEL_MFC: 369 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 370 if (error) 371 break; 372 error = del_m6fc(&mfcc); 373 break; 374 case MRT6_DEL_MIF: 375 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 376 if (error) 377 break; 378 error = del_m6if(&mifi); 379 break; 380 case MRT6_PIM: 381 error = sooptcopyin(sopt, &optval, sizeof(optval), 382 sizeof(optval)); 383 if (error) 384 break; 385 error = set_pim6(&optval); 386 break; 387 default: 388 error = EOPNOTSUPP; 389 break; 390 } 391 392 return (error); 393} 394 395/* 396 * Handle MRT getsockopt commands 397 */ 398int 399X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 400{ 401 INIT_VNET_INET6(curvnet); 402 int error = 0; 403 404 if (so != ip6_mrouter) 405 return (EACCES); 406 407 switch (sopt->sopt_name) { 408 case MRT6_PIM: 409 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 410 break; 411 } 412 return (error); 413} 414 415/* 416 * Handle ioctl commands to obtain information from the cache 417 */ 418int 419X_mrt6_ioctl(int cmd, caddr_t data) 420{ 421 switch (cmd) { 422 case SIOCGETSGCNT_IN6: 423 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 424 case SIOCGETMIFCNT_IN6: 425 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 426 default: 427 return (EINVAL); 428 } 429} 430 431/* 432 * returns the packet, byte, rpf-failure count for the source group provided 433 */ 434static int 435get_sg_cnt(struct sioc_sg_req6 *req) 436{ 437 struct mf6c *rt; 438 int s; 439 440 s = splnet(); 441 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 442 splx(s); 443 if (rt != NULL) { 444 req->pktcnt = rt->mf6c_pkt_cnt; 445 req->bytecnt = rt->mf6c_byte_cnt; 446 req->wrong_if = rt->mf6c_wrong_if; 447 } else 448 return (ESRCH); 449#if 0 450 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 451#endif 452 453 return (0); 454} 455 456/* 457 * returns the input and output packet and byte counts on the mif provided 458 */ 459static int 460get_mif6_cnt(struct sioc_mif_req6 *req) 461{ 462 mifi_t mifi = req->mifi; 463 464 if (mifi >= nummifs) 465 return (EINVAL); 466 467 req->icount = mif6table[mifi].m6_pkt_in; 468 req->ocount = mif6table[mifi].m6_pkt_out; 469 req->ibytes = mif6table[mifi].m6_bytes_in; 470 req->obytes = mif6table[mifi].m6_bytes_out; 471 472 return (0); 473} 474 475static int 476set_pim6(int *i) 477{ 478 INIT_VNET_INET6(curvnet); 479 if ((*i != 1) && (*i != 0)) 480 return (EINVAL); 481 482 V_pim6 = *i; 483 484 return (0); 485} 486 487/* 488 * Enable multicast routing 489 */ 490static int 491ip6_mrouter_init(struct socket *so, int v, int cmd) 492{ 493 INIT_VNET_INET6(curvnet); 494 495#ifdef MRT6DEBUG 496 if (V_mrt6debug) 497 log(LOG_DEBUG, 498 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 499 so->so_type, so->so_proto->pr_protocol); 500#endif 501 502 if (so->so_type != SOCK_RAW || 503 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 504 return (EOPNOTSUPP); 505 506 if (v != 1) 507 return (ENOPROTOOPT); 508 509 if (ip6_mrouter != NULL) 510 return (EADDRINUSE); 511 512 ip6_mrouter = so; 513 V_ip6_mrouter_ver = cmd; 514 515 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 516 bzero((caddr_t)n6expire, sizeof(n6expire)); 517 518 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 519 520 callout_init(&expire_upcalls_ch, 0); 521 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 522 expire_upcalls, NULL); 523 524#ifdef MRT6DEBUG 525 if (V_mrt6debug) 526 log(LOG_DEBUG, "ip6_mrouter_init\n"); 527#endif 528 529 return (0); 530} 531 532/* 533 * Disable multicast routing 534 */ 535int 536X_ip6_mrouter_done(void) 537{ 538 INIT_VNET_INET6(curvnet); 539 mifi_t mifi; 540 int i; 541 struct mf6c *rt; 542 struct rtdetq *rte; 543 int s; 544 545 s = splnet(); 546 547 /* 548 * For each phyint in use, disable promiscuous reception of all IPv6 549 * multicasts. 550 */ 551#ifdef INET 552#ifdef MROUTING 553 /* 554 * If there is still IPv4 multicast routing daemon, 555 * we remain interfaces to receive all muliticasted packets. 556 * XXX: there may be an interface in which the IPv4 multicast 557 * daemon is not interested... 558 */ 559 if (!V_ip_mrouter) 560#endif 561#endif 562 { 563 for (mifi = 0; mifi < nummifs; mifi++) { 564 if (mif6table[mifi].m6_ifp && 565 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 566 if_allmulti(mif6table[mifi].m6_ifp, 0); 567 } 568 } 569 } 570 bzero((caddr_t)mif6table, sizeof(mif6table)); 571 nummifs = 0; 572 573 V_pim6 = 0; /* used to stub out/in pim specific code */ 574 575 callout_stop(&expire_upcalls_ch); 576 577 /* 578 * Free all multicast forwarding cache entries. 579 */ 580 for (i = 0; i < MF6CTBLSIZ; i++) { 581 rt = mf6ctable[i]; 582 while (rt) { 583 struct mf6c *frt; 584 585 for (rte = rt->mf6c_stall; rte != NULL; ) { 586 struct rtdetq *n = rte->next; 587 588 m_free(rte->m); 589 free(rte, M_MRTABLE6); 590 rte = n; 591 } 592 frt = rt; 593 rt = rt->mf6c_next; 594 free(frt, M_MRTABLE6); 595 } 596 } 597 598 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 599 600 /* 601 * Reset register interface 602 */ 603 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 604 if_detach(multicast_register_if6); 605 if_free(multicast_register_if6); 606 reg_mif_num = (mifi_t)-1; 607 multicast_register_if6 = NULL; 608 } 609 610 ip6_mrouter = NULL; 611 V_ip6_mrouter_ver = 0; 612 613 splx(s); 614 615#ifdef MRT6DEBUG 616 if (V_mrt6debug) 617 log(LOG_DEBUG, "ip6_mrouter_done\n"); 618#endif 619 620 return (0); 621} 622 623static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 624 625/* 626 * Add a mif to the mif table 627 */ 628static int 629add_m6if(struct mif6ctl *mifcp) 630{ 631 INIT_VNET_NET(curvnet); 632 struct mif6 *mifp; 633 struct ifnet *ifp; 634 int error, s; 635 636 if (mifcp->mif6c_mifi >= MAXMIFS) 637 return (EINVAL); 638 mifp = mif6table + mifcp->mif6c_mifi; 639 if (mifp->m6_ifp) 640 return (EADDRINUSE); /* XXX: is it appropriate? */ 641 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) 642 return (ENXIO); 643 ifp = ifnet_byindex(mifcp->mif6c_pifi); 644 645 if (mifcp->mif6c_flags & MIFF_REGISTER) { 646 if (reg_mif_num == (mifi_t)-1) { 647 ifp = if_alloc(IFT_OTHER); 648 649 if_initname(ifp, "register_mif", 0); 650 ifp->if_flags |= IFF_LOOPBACK; 651 if_attach(ifp); 652 multicast_register_if6 = ifp; 653 reg_mif_num = mifcp->mif6c_mifi; 654 /* 655 * it is impossible to guess the ifindex of the 656 * register interface. So mif6c_pifi is automatically 657 * calculated. 658 */ 659 mifcp->mif6c_pifi = ifp->if_index; 660 } else { 661 ifp = multicast_register_if6; 662 } 663 664 } /* if REGISTER */ 665 else { 666 /* Make sure the interface supports multicast */ 667 if ((ifp->if_flags & IFF_MULTICAST) == 0) 668 return (EOPNOTSUPP); 669 670 s = splnet(); 671 error = if_allmulti(ifp, 1); 672 splx(s); 673 if (error) 674 return (error); 675 } 676 677 s = splnet(); 678 mifp->m6_flags = mifcp->mif6c_flags; 679 mifp->m6_ifp = ifp; 680 681 /* initialize per mif pkt counters */ 682 mifp->m6_pkt_in = 0; 683 mifp->m6_pkt_out = 0; 684 mifp->m6_bytes_in = 0; 685 mifp->m6_bytes_out = 0; 686 splx(s); 687 688 /* Adjust nummifs up if the mifi is higher than nummifs */ 689 if (nummifs <= mifcp->mif6c_mifi) 690 nummifs = mifcp->mif6c_mifi + 1; 691 692#ifdef MRT6DEBUG 693 if (V_mrt6debug) 694 log(LOG_DEBUG, 695 "add_mif #%d, phyint %s\n", 696 mifcp->mif6c_mifi, 697 ifp->if_xname); 698#endif 699 700 return (0); 701} 702 703/* 704 * Delete a mif from the mif table 705 */ 706static int 707del_m6if(mifi_t *mifip) 708{ 709 struct mif6 *mifp = mif6table + *mifip; 710 mifi_t mifi; 711 struct ifnet *ifp; 712 int s; 713 714 if (*mifip >= nummifs) 715 return (EINVAL); 716 if (mifp->m6_ifp == NULL) 717 return (EINVAL); 718 719 s = splnet(); 720 721 if (!(mifp->m6_flags & MIFF_REGISTER)) { 722 /* 723 * XXX: what if there is yet IPv4 multicast daemon 724 * using the interface? 725 */ 726 ifp = mifp->m6_ifp; 727 728 if_allmulti(ifp, 0); 729 } else { 730 if (reg_mif_num != (mifi_t)-1 && 731 multicast_register_if6 != NULL) { 732 if_detach(multicast_register_if6); 733 if_free(multicast_register_if6); 734 reg_mif_num = (mifi_t)-1; 735 multicast_register_if6 = NULL; 736 } 737 } 738 739 bzero((caddr_t)mifp, sizeof(*mifp)); 740 741 /* Adjust nummifs down */ 742 for (mifi = nummifs; mifi > 0; mifi--) 743 if (mif6table[mifi - 1].m6_ifp) 744 break; 745 nummifs = mifi; 746 747 splx(s); 748 749#ifdef MRT6DEBUG 750 if (V_mrt6debug) 751 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 752#endif 753 754 return (0); 755} 756 757/* 758 * Add an mfc entry 759 */ 760static int 761add_m6fc(struct mf6cctl *mfccp) 762{ 763 struct mf6c *rt; 764 u_long hash; 765 struct rtdetq *rte; 766 u_short nstl; 767 int s; 768 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 769 770 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 771 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 772 773 /* If an entry already exists, just update the fields */ 774 if (rt) { 775#ifdef MRT6DEBUG 776 if (V_mrt6debug & DEBUG_MFC) { 777 log(LOG_DEBUG, 778 "add_m6fc no upcall h %d o %s g %s p %x\n", 779 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 780 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 781 mfccp->mf6cc_parent); 782 } 783#endif 784 785 s = splnet(); 786 rt->mf6c_parent = mfccp->mf6cc_parent; 787 rt->mf6c_ifset = mfccp->mf6cc_ifset; 788 splx(s); 789 return (0); 790 } 791 792 /* 793 * Find the entry for which the upcall was made and update 794 */ 795 s = splnet(); 796 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 797 mfccp->mf6cc_mcastgrp.sin6_addr); 798 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 799 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 800 &mfccp->mf6cc_origin.sin6_addr) && 801 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 802 &mfccp->mf6cc_mcastgrp.sin6_addr) && 803 (rt->mf6c_stall != NULL)) { 804 805 if (nstl++) 806 log(LOG_ERR, 807 "add_m6fc: %s o %s g %s p %x dbx %p\n", 808 "multiple kernel entries", 809 ip6_sprintf(ip6bufo, 810 &mfccp->mf6cc_origin.sin6_addr), 811 ip6_sprintf(ip6bufg, 812 &mfccp->mf6cc_mcastgrp.sin6_addr), 813 mfccp->mf6cc_parent, rt->mf6c_stall); 814 815#ifdef MRT6DEBUG 816 if (V_mrt6debug & DEBUG_MFC) 817 log(LOG_DEBUG, 818 "add_m6fc o %s g %s p %x dbg %x\n", 819 ip6_sprintf(ip6bufo, 820 &mfccp->mf6cc_origin.sin6_addr), 821 ip6_sprintf(ip6bufg, 822 &mfccp->mf6cc_mcastgrp.sin6_addr), 823 mfccp->mf6cc_parent, rt->mf6c_stall); 824#endif 825 826 rt->mf6c_origin = mfccp->mf6cc_origin; 827 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 828 rt->mf6c_parent = mfccp->mf6cc_parent; 829 rt->mf6c_ifset = mfccp->mf6cc_ifset; 830 /* initialize pkt counters per src-grp */ 831 rt->mf6c_pkt_cnt = 0; 832 rt->mf6c_byte_cnt = 0; 833 rt->mf6c_wrong_if = 0; 834 835 rt->mf6c_expire = 0; /* Don't clean this guy up */ 836 n6expire[hash]--; 837 838 /* free packets Qed at the end of this entry */ 839 for (rte = rt->mf6c_stall; rte != NULL; ) { 840 struct rtdetq *n = rte->next; 841 ip6_mdq(rte->m, rte->ifp, rt); 842 m_freem(rte->m); 843#ifdef UPCALL_TIMING 844 collate(&(rte->t)); 845#endif /* UPCALL_TIMING */ 846 free(rte, M_MRTABLE6); 847 rte = n; 848 } 849 rt->mf6c_stall = NULL; 850 } 851 } 852 853 /* 854 * It is possible that an entry is being inserted without an upcall 855 */ 856 if (nstl == 0) { 857#ifdef MRT6DEBUG 858 if (V_mrt6debug & DEBUG_MFC) 859 log(LOG_DEBUG, 860 "add_mfc no upcall h %d o %s g %s p %x\n", 861 hash, 862 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 863 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 864 mfccp->mf6cc_parent); 865#endif 866 867 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 868 869 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 870 &mfccp->mf6cc_origin.sin6_addr)&& 871 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 872 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 873 874 rt->mf6c_origin = mfccp->mf6cc_origin; 875 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 876 rt->mf6c_parent = mfccp->mf6cc_parent; 877 rt->mf6c_ifset = mfccp->mf6cc_ifset; 878 /* initialize pkt counters per src-grp */ 879 rt->mf6c_pkt_cnt = 0; 880 rt->mf6c_byte_cnt = 0; 881 rt->mf6c_wrong_if = 0; 882 883 if (rt->mf6c_expire) 884 n6expire[hash]--; 885 rt->mf6c_expire = 0; 886 } 887 } 888 if (rt == NULL) { 889 /* no upcall, so make a new entry */ 890 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 891 M_NOWAIT); 892 if (rt == NULL) { 893 splx(s); 894 return (ENOBUFS); 895 } 896 897 /* insert new entry at head of hash chain */ 898 rt->mf6c_origin = mfccp->mf6cc_origin; 899 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 900 rt->mf6c_parent = mfccp->mf6cc_parent; 901 rt->mf6c_ifset = mfccp->mf6cc_ifset; 902 /* initialize pkt counters per src-grp */ 903 rt->mf6c_pkt_cnt = 0; 904 rt->mf6c_byte_cnt = 0; 905 rt->mf6c_wrong_if = 0; 906 rt->mf6c_expire = 0; 907 rt->mf6c_stall = NULL; 908 909 /* link into table */ 910 rt->mf6c_next = mf6ctable[hash]; 911 mf6ctable[hash] = rt; 912 } 913 } 914 splx(s); 915 return (0); 916} 917 918#ifdef UPCALL_TIMING 919/* 920 * collect delay statistics on the upcalls 921 */ 922static void 923collate(struct timeval *t) 924{ 925 u_long d; 926 struct timeval tp; 927 u_long delta; 928 929 GET_TIME(tp); 930 931 if (TV_LT(*t, tp)) 932 { 933 TV_DELTA(tp, *t, delta); 934 935 d = delta >> 10; 936 if (d > UPCALL_MAX) 937 d = UPCALL_MAX; 938 939 ++upcall_data[d]; 940 } 941} 942#endif /* UPCALL_TIMING */ 943 944/* 945 * Delete an mfc entry 946 */ 947static int 948del_m6fc(struct mf6cctl *mfccp) 949{ 950 struct sockaddr_in6 origin; 951 struct sockaddr_in6 mcastgrp; 952 struct mf6c *rt; 953 struct mf6c **nptr; 954 u_long hash; 955 int s; 956 957 origin = mfccp->mf6cc_origin; 958 mcastgrp = mfccp->mf6cc_mcastgrp; 959 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 960 961#ifdef MRT6DEBUG 962 if (V_mrt6debug & DEBUG_MFC) { 963 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 964 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 965 ip6_sprintf(ip6bufo, &origin.sin6_addr), 966 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 967 } 968#endif 969 970 s = splnet(); 971 972 nptr = &mf6ctable[hash]; 973 while ((rt = *nptr) != NULL) { 974 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 975 &rt->mf6c_origin.sin6_addr) && 976 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 977 &rt->mf6c_mcastgrp.sin6_addr) && 978 rt->mf6c_stall == NULL) 979 break; 980 981 nptr = &rt->mf6c_next; 982 } 983 if (rt == NULL) { 984 splx(s); 985 return (EADDRNOTAVAIL); 986 } 987 988 *nptr = rt->mf6c_next; 989 free(rt, M_MRTABLE6); 990 991 splx(s); 992 993 return (0); 994} 995 996static int 997socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 998{ 999 1000 if (s) { 1001 if (sbappendaddr(&s->so_rcv, 1002 (struct sockaddr *)src, 1003 mm, (struct mbuf *)0) != 0) { 1004 sorwakeup(s); 1005 return (0); 1006 } 1007 } 1008 m_freem(mm); 1009 return (-1); 1010} 1011 1012/* 1013 * IPv6 multicast forwarding function. This function assumes that the packet 1014 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1015 * pointed to by "ifp", and the packet is to be relayed to other networks 1016 * that have members of the packet's destination IPv6 multicast group. 1017 * 1018 * The packet is returned unscathed to the caller, unless it is 1019 * erroneous, in which case a non-zero return value tells the caller to 1020 * discard it. 1021 * 1022 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1023 * this function is called in the originating context (i.e., not when 1024 * forwarding a packet from other node). ip6_output(), which is currently the 1025 * only function that calls this function is called in the originating context, 1026 * explicitly ensures this condition. It is caller's responsibility to ensure 1027 * that if this function is called from somewhere else in the originating 1028 * context in the future. 1029 */ 1030int 1031X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1032{ 1033 INIT_VNET_INET6(curvnet); 1034 struct mf6c *rt; 1035 struct mif6 *mifp; 1036 struct mbuf *mm; 1037 int s; 1038 mifi_t mifi; 1039 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1040 1041#ifdef MRT6DEBUG 1042 if (V_mrt6debug & DEBUG_FORWARD) 1043 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1044 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1045 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1046 ifp->if_index); 1047#endif 1048 1049 /* 1050 * Don't forward a packet with Hop limit of zero or one, 1051 * or a packet destined to a local-only group. 1052 */ 1053 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1054 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1055 return (0); 1056 ip6->ip6_hlim--; 1057 1058 /* 1059 * Source address check: do not forward packets with unspecified 1060 * source. It was discussed in July 2000, on ipngwg mailing list. 1061 * This is rather more serious than unicast cases, because some 1062 * MLD packets can be sent with the unspecified source address 1063 * (although such packets must normally set 1 to the hop limit field). 1064 */ 1065 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1066 V_ip6stat.ip6s_cantforward++; 1067 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1068 V_ip6_log_time = time_second; 1069 log(LOG_DEBUG, 1070 "cannot forward " 1071 "from %s to %s nxt %d received on %s\n", 1072 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1073 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1074 ip6->ip6_nxt, 1075 if_name(m->m_pkthdr.rcvif)); 1076 } 1077 return (0); 1078 } 1079 1080 /* 1081 * Determine forwarding mifs from the forwarding cache table 1082 */ 1083 s = splnet(); 1084 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1085 1086 /* Entry exists, so forward if necessary */ 1087 if (rt) { 1088 splx(s); 1089 return (ip6_mdq(m, ifp, rt)); 1090 } else { 1091 /* 1092 * If we don't have a route for packet's origin, 1093 * Make a copy of the packet & 1094 * send message to routing daemon 1095 */ 1096 1097 struct mbuf *mb0; 1098 struct rtdetq *rte; 1099 u_long hash; 1100/* int i, npkts;*/ 1101#ifdef UPCALL_TIMING 1102 struct timeval tp; 1103 1104 GET_TIME(tp); 1105#endif /* UPCALL_TIMING */ 1106 1107 mrt6stat.mrt6s_no_route++; 1108#ifdef MRT6DEBUG 1109 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1110 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1111 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1112 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1113#endif 1114 1115 /* 1116 * Allocate mbufs early so that we don't do extra work if we 1117 * are just going to fail anyway. 1118 */ 1119 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1120 M_NOWAIT); 1121 if (rte == NULL) { 1122 splx(s); 1123 return (ENOBUFS); 1124 } 1125 mb0 = m_copy(m, 0, M_COPYALL); 1126 /* 1127 * Pullup packet header if needed before storing it, 1128 * as other references may modify it in the meantime. 1129 */ 1130 if (mb0 && 1131 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1132 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1133 if (mb0 == NULL) { 1134 free(rte, M_MRTABLE6); 1135 splx(s); 1136 return (ENOBUFS); 1137 } 1138 1139 /* is there an upcall waiting for this packet? */ 1140 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1141 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1142 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1143 &rt->mf6c_origin.sin6_addr) && 1144 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1145 &rt->mf6c_mcastgrp.sin6_addr) && 1146 (rt->mf6c_stall != NULL)) 1147 break; 1148 } 1149 1150 if (rt == NULL) { 1151 struct mrt6msg *im; 1152#ifdef MRT6_OINIT 1153 struct omrt6msg *oim; 1154#endif 1155 1156 /* no upcall, so make a new entry */ 1157 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1158 M_NOWAIT); 1159 if (rt == NULL) { 1160 free(rte, M_MRTABLE6); 1161 m_freem(mb0); 1162 splx(s); 1163 return (ENOBUFS); 1164 } 1165 /* 1166 * Make a copy of the header to send to the user 1167 * level process 1168 */ 1169 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1170 1171 if (mm == NULL) { 1172 free(rte, M_MRTABLE6); 1173 m_freem(mb0); 1174 free(rt, M_MRTABLE6); 1175 splx(s); 1176 return (ENOBUFS); 1177 } 1178 1179 /* 1180 * Send message to routing daemon 1181 */ 1182 sin6.sin6_addr = ip6->ip6_src; 1183 1184 im = NULL; 1185#ifdef MRT6_OINIT 1186 oim = NULL; 1187#endif 1188 switch (V_ip6_mrouter_ver) { 1189#ifdef MRT6_OINIT 1190 case MRT6_OINIT: 1191 oim = mtod(mm, struct omrt6msg *); 1192 oim->im6_msgtype = MRT6MSG_NOCACHE; 1193 oim->im6_mbz = 0; 1194 break; 1195#endif 1196 case MRT6_INIT: 1197 im = mtod(mm, struct mrt6msg *); 1198 im->im6_msgtype = MRT6MSG_NOCACHE; 1199 im->im6_mbz = 0; 1200 break; 1201 default: 1202 free(rte, M_MRTABLE6); 1203 m_freem(mb0); 1204 free(rt, M_MRTABLE6); 1205 splx(s); 1206 return (EINVAL); 1207 } 1208 1209#ifdef MRT6DEBUG 1210 if (V_mrt6debug & DEBUG_FORWARD) 1211 log(LOG_DEBUG, 1212 "getting the iif info in the kernel\n"); 1213#endif 1214 1215 for (mifp = mif6table, mifi = 0; 1216 mifi < nummifs && mifp->m6_ifp != ifp; 1217 mifp++, mifi++) 1218 ; 1219 1220 switch (V_ip6_mrouter_ver) { 1221#ifdef MRT6_OINIT 1222 case MRT6_OINIT: 1223 oim->im6_mif = mifi; 1224 break; 1225#endif 1226 case MRT6_INIT: 1227 im->im6_mif = mifi; 1228 break; 1229 } 1230 1231 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1232 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1233 "socket queue full\n"); 1234 mrt6stat.mrt6s_upq_sockfull++; 1235 free(rte, M_MRTABLE6); 1236 m_freem(mb0); 1237 free(rt, M_MRTABLE6); 1238 splx(s); 1239 return (ENOBUFS); 1240 } 1241 1242 mrt6stat.mrt6s_upcalls++; 1243 1244 /* insert new entry at head of hash chain */ 1245 bzero(rt, sizeof(*rt)); 1246 rt->mf6c_origin.sin6_family = AF_INET6; 1247 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1248 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1249 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1250 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1251 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1252 rt->mf6c_expire = UPCALL_EXPIRE; 1253 n6expire[hash]++; 1254 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1255 1256 /* link into table */ 1257 rt->mf6c_next = mf6ctable[hash]; 1258 mf6ctable[hash] = rt; 1259 /* Add this entry to the end of the queue */ 1260 rt->mf6c_stall = rte; 1261 } else { 1262 /* determine if q has overflowed */ 1263 struct rtdetq **p; 1264 int npkts = 0; 1265 1266 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1267 if (++npkts > MAX_UPQ6) { 1268 mrt6stat.mrt6s_upq_ovflw++; 1269 free(rte, M_MRTABLE6); 1270 m_freem(mb0); 1271 splx(s); 1272 return (0); 1273 } 1274 1275 /* Add this entry to the end of the queue */ 1276 *p = rte; 1277 } 1278 1279 rte->next = NULL; 1280 rte->m = mb0; 1281 rte->ifp = ifp; 1282#ifdef UPCALL_TIMING 1283 rte->t = tp; 1284#endif /* UPCALL_TIMING */ 1285 1286 splx(s); 1287 1288 return (0); 1289 } 1290} 1291 1292/* 1293 * Clean up cache entries if upcalls are not serviced 1294 * Call from the Slow Timeout mechanism, every half second. 1295 */ 1296static void 1297expire_upcalls(void *unused) 1298{ 1299 struct rtdetq *rte; 1300 struct mf6c *mfc, **nptr; 1301 int i; 1302 int s; 1303 1304 s = splnet(); 1305 for (i = 0; i < MF6CTBLSIZ; i++) { 1306 if (n6expire[i] == 0) 1307 continue; 1308 nptr = &mf6ctable[i]; 1309 while ((mfc = *nptr) != NULL) { 1310 rte = mfc->mf6c_stall; 1311 /* 1312 * Skip real cache entries 1313 * Make sure it wasn't marked to not expire (shouldn't happen) 1314 * If it expires now 1315 */ 1316 if (rte != NULL && 1317 mfc->mf6c_expire != 0 && 1318 --mfc->mf6c_expire == 0) { 1319#ifdef MRT6DEBUG 1320 if (V_mrt6debug & DEBUG_EXPIRE) { 1321 char ip6bufo[INET6_ADDRSTRLEN]; 1322 char ip6bufg[INET6_ADDRSTRLEN]; 1323 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1324 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1325 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1326 } 1327#endif 1328 /* 1329 * drop all the packets 1330 * free the mbuf with the pkt, if, timing info 1331 */ 1332 do { 1333 struct rtdetq *n = rte->next; 1334 m_freem(rte->m); 1335 free(rte, M_MRTABLE6); 1336 rte = n; 1337 } while (rte != NULL); 1338 mrt6stat.mrt6s_cache_cleanups++; 1339 n6expire[i]--; 1340 1341 *nptr = mfc->mf6c_next; 1342 free(mfc, M_MRTABLE6); 1343 } else { 1344 nptr = &mfc->mf6c_next; 1345 } 1346 } 1347 } 1348 splx(s); 1349 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1350 expire_upcalls, NULL); 1351} 1352 1353/* 1354 * Packet forwarding routine once entry in the cache is made 1355 */ 1356static int 1357ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1358{ 1359 INIT_VNET_INET6(curvnet); 1360 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1361 mifi_t mifi, iif; 1362 struct mif6 *mifp; 1363 int plen = m->m_pkthdr.len; 1364 struct in6_addr src0, dst0; /* copies for local work */ 1365 u_int32_t iszone, idzone, oszone, odzone; 1366 int error = 0; 1367 1368/* 1369 * Macro to send packet on mif. Since RSVP packets don't get counted on 1370 * input, they shouldn't get counted on output, so statistics keeping is 1371 * separate. 1372 */ 1373 1374#define MC6_SEND(ip6, mifp, m) do { \ 1375 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1376 register_send((ip6), (mifp), (m)); \ 1377 else \ 1378 phyint_send((ip6), (mifp), (m)); \ 1379} while (/*CONSTCOND*/ 0) 1380 1381 /* 1382 * Don't forward if it didn't arrive from the parent mif 1383 * for its origin. 1384 */ 1385 mifi = rt->mf6c_parent; 1386 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1387 /* came in the wrong interface */ 1388#ifdef MRT6DEBUG 1389 if (V_mrt6debug & DEBUG_FORWARD) 1390 log(LOG_DEBUG, 1391 "wrong if: ifid %d mifi %d mififid %x\n", 1392 ifp->if_index, mifi, 1393 mif6table[mifi].m6_ifp->if_index); 1394#endif 1395 mrt6stat.mrt6s_wrong_if++; 1396 rt->mf6c_wrong_if++; 1397 /* 1398 * If we are doing PIM processing, and we are forwarding 1399 * packets on this interface, send a message to the 1400 * routing daemon. 1401 */ 1402 /* have to make sure this is a valid mif */ 1403 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1404 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1405 /* 1406 * Check the M_LOOP flag to avoid an 1407 * unnecessary PIM assert. 1408 * XXX: M_LOOP is an ad-hoc hack... 1409 */ 1410 static struct sockaddr_in6 sin6 = 1411 { sizeof(sin6), AF_INET6 }; 1412 1413 struct mbuf *mm; 1414 struct mrt6msg *im; 1415#ifdef MRT6_OINIT 1416 struct omrt6msg *oim; 1417#endif 1418 1419 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1420 if (mm && 1421 (M_HASCL(mm) || 1422 mm->m_len < sizeof(struct ip6_hdr))) 1423 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1424 if (mm == NULL) 1425 return (ENOBUFS); 1426 1427#ifdef MRT6_OINIT 1428 oim = NULL; 1429#endif 1430 im = NULL; 1431 switch (V_ip6_mrouter_ver) { 1432#ifdef MRT6_OINIT 1433 case MRT6_OINIT: 1434 oim = mtod(mm, struct omrt6msg *); 1435 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1436 oim->im6_mbz = 0; 1437 break; 1438#endif 1439 case MRT6_INIT: 1440 im = mtod(mm, struct mrt6msg *); 1441 im->im6_msgtype = MRT6MSG_WRONGMIF; 1442 im->im6_mbz = 0; 1443 break; 1444 default: 1445 m_freem(mm); 1446 return (EINVAL); 1447 } 1448 1449 for (mifp = mif6table, iif = 0; 1450 iif < nummifs && mifp && 1451 mifp->m6_ifp != ifp; 1452 mifp++, iif++) 1453 ; 1454 1455 switch (V_ip6_mrouter_ver) { 1456#ifdef MRT6_OINIT 1457 case MRT6_OINIT: 1458 oim->im6_mif = iif; 1459 sin6.sin6_addr = oim->im6_src; 1460 break; 1461#endif 1462 case MRT6_INIT: 1463 im->im6_mif = iif; 1464 sin6.sin6_addr = im->im6_src; 1465 break; 1466 } 1467 1468 mrt6stat.mrt6s_upcalls++; 1469 1470 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1471#ifdef MRT6DEBUG 1472 if (V_mrt6debug) 1473 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1474#endif 1475 ++mrt6stat.mrt6s_upq_sockfull; 1476 return (ENOBUFS); 1477 } /* if socket Q full */ 1478 } /* if PIM */ 1479 return (0); 1480 } /* if wrong iif */ 1481 1482 /* If I sourced this packet, it counts as output, else it was input. */ 1483 if (m->m_pkthdr.rcvif == NULL) { 1484 /* XXX: is rcvif really NULL when output?? */ 1485 mif6table[mifi].m6_pkt_out++; 1486 mif6table[mifi].m6_bytes_out += plen; 1487 } else { 1488 mif6table[mifi].m6_pkt_in++; 1489 mif6table[mifi].m6_bytes_in += plen; 1490 } 1491 rt->mf6c_pkt_cnt++; 1492 rt->mf6c_byte_cnt += plen; 1493 1494 /* 1495 * For each mif, forward a copy of the packet if there are group 1496 * members downstream on the interface. 1497 */ 1498 src0 = ip6->ip6_src; 1499 dst0 = ip6->ip6_dst; 1500 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1501 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1502 V_ip6stat.ip6s_badscope++; 1503 return (error); 1504 } 1505 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1506 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1507 /* 1508 * check if the outgoing packet is going to break 1509 * a scope boundary. 1510 * XXX For packets through PIM register tunnel 1511 * interface, we believe a routing daemon. 1512 */ 1513 if (!(mif6table[rt->mf6c_parent].m6_flags & 1514 MIFF_REGISTER) && 1515 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1516 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1517 &oszone) || 1518 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1519 &odzone) || 1520 iszone != oszone || 1521 idzone != odzone) { 1522 V_ip6stat.ip6s_badscope++; 1523 continue; 1524 } 1525 } 1526 1527 mifp->m6_pkt_out++; 1528 mifp->m6_bytes_out += plen; 1529 MC6_SEND(ip6, mifp, m); 1530 } 1531 } 1532 return (0); 1533} 1534 1535static void 1536phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1537{ 1538 INIT_VNET_INET6(curvnet); 1539 struct mbuf *mb_copy; 1540 struct ifnet *ifp = mifp->m6_ifp; 1541 int error = 0; 1542 int s = splnet(); /* needs to protect static "ro" below. */ 1543 static struct route_in6 ro; 1544 struct in6_multi *in6m; 1545 struct sockaddr_in6 *dst6; 1546 u_long linkmtu; 1547 1548 /* 1549 * Make a new reference to the packet; make sure that 1550 * the IPv6 header is actually copied, not just referenced, 1551 * so that ip6_output() only scribbles on the copy. 1552 */ 1553 mb_copy = m_copy(m, 0, M_COPYALL); 1554 if (mb_copy && 1555 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1556 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1557 if (mb_copy == NULL) { 1558 splx(s); 1559 return; 1560 } 1561 /* set MCAST flag to the outgoing packet */ 1562 mb_copy->m_flags |= M_MCAST; 1563 1564 /* 1565 * If we sourced the packet, call ip6_output since we may devide 1566 * the packet into fragments when the packet is too big for the 1567 * outgoing interface. 1568 * Otherwise, we can simply send the packet to the interface 1569 * sending queue. 1570 */ 1571 if (m->m_pkthdr.rcvif == NULL) { 1572 struct ip6_moptions im6o; 1573 1574 im6o.im6o_multicast_ifp = ifp; 1575 /* XXX: ip6_output will override ip6->ip6_hlim */ 1576 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1577 im6o.im6o_multicast_loop = 1; 1578 error = ip6_output(mb_copy, NULL, &ro, 1579 IPV6_FORWARDING, &im6o, NULL, NULL); 1580 1581#ifdef MRT6DEBUG 1582 if (V_mrt6debug & DEBUG_XMIT) 1583 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1584 mifp - mif6table, error); 1585#endif 1586 splx(s); 1587 return; 1588 } 1589 1590 /* 1591 * If we belong to the destination multicast group 1592 * on the outgoing interface, loop back a copy. 1593 */ 1594 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1595 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1596 if (in6m != NULL) { 1597 dst6->sin6_len = sizeof(struct sockaddr_in6); 1598 dst6->sin6_family = AF_INET6; 1599 dst6->sin6_addr = ip6->ip6_dst; 1600 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1601 } 1602 /* 1603 * Put the packet into the sending queue of the outgoing interface 1604 * if it would fit in the MTU of the interface. 1605 */ 1606 linkmtu = IN6_LINKMTU(ifp); 1607 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1608 dst6->sin6_len = sizeof(struct sockaddr_in6); 1609 dst6->sin6_family = AF_INET6; 1610 dst6->sin6_addr = ip6->ip6_dst; 1611 /* 1612 * We just call if_output instead of nd6_output here, since 1613 * we need no ND for a multicast forwarded packet...right? 1614 */ 1615 error = (*ifp->if_output)(ifp, mb_copy, 1616 (struct sockaddr *)&ro.ro_dst, NULL); 1617#ifdef MRT6DEBUG 1618 if (V_mrt6debug & DEBUG_XMIT) 1619 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1620 mifp - mif6table, error); 1621#endif 1622 } else { 1623 /* 1624 * pMTU discovery is intentionally disabled by default, since 1625 * various router may notify pMTU in multicast, which can be 1626 * a DDoS to a router 1627 */ 1628 if (V_ip6_mcast_pmtu) 1629 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1630 else { 1631#ifdef MRT6DEBUG 1632 if (V_mrt6debug & DEBUG_XMIT) { 1633 char ip6bufs[INET6_ADDRSTRLEN]; 1634 char ip6bufd[INET6_ADDRSTRLEN]; 1635 log(LOG_DEBUG, 1636 "phyint_send: packet too big on %s o %s " 1637 "g %s size %d(discarded)\n", 1638 if_name(ifp), 1639 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1640 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1641 mb_copy->m_pkthdr.len); 1642 } 1643#endif /* MRT6DEBUG */ 1644 m_freem(mb_copy); /* simply discard the packet */ 1645 } 1646 } 1647 1648 splx(s); 1649} 1650 1651static int 1652register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1653{ 1654 struct mbuf *mm; 1655 int i, len = m->m_pkthdr.len; 1656 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1657 struct mrt6msg *im6; 1658 1659#ifdef MRT6DEBUG 1660 if (V_mrt6debug) { 1661 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1662 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1663 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1664 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1665 } 1666#endif 1667 ++pim6stat.pim6s_snd_registers; 1668 1669 /* Make a copy of the packet to send to the user level process */ 1670 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1671 if (mm == NULL) 1672 return (ENOBUFS); 1673 mm->m_pkthdr.rcvif = NULL; 1674 mm->m_data += max_linkhdr; 1675 mm->m_len = sizeof(struct ip6_hdr); 1676 1677 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1678 m_freem(mm); 1679 return (ENOBUFS); 1680 } 1681 i = MHLEN - M_LEADINGSPACE(mm); 1682 if (i > len) 1683 i = len; 1684 mm = m_pullup(mm, i); 1685 if (mm == NULL) 1686 return (ENOBUFS); 1687/* TODO: check it! */ 1688 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1689 1690 /* 1691 * Send message to routing daemon 1692 */ 1693 sin6.sin6_addr = ip6->ip6_src; 1694 1695 im6 = mtod(mm, struct mrt6msg *); 1696 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1697 im6->im6_mbz = 0; 1698 1699 im6->im6_mif = mif - mif6table; 1700 1701 /* iif info is not given for reg. encap.n */ 1702 mrt6stat.mrt6s_upcalls++; 1703 1704 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1705#ifdef MRT6DEBUG 1706 if (V_mrt6debug) 1707 log(LOG_WARNING, 1708 "register_send: ip6_mrouter socket queue full\n"); 1709#endif 1710 ++mrt6stat.mrt6s_upq_sockfull; 1711 return (ENOBUFS); 1712 } 1713 return (0); 1714} 1715 1716/* 1717 * PIM sparse mode hook 1718 * Receives the pim control messages, and passes them up to the listening 1719 * socket, using rip6_input. 1720 * The only message processed is the REGISTER pim message; the pim header 1721 * is stripped off, and the inner packet is passed to register_mforward. 1722 */ 1723int 1724pim6_input(struct mbuf **mp, int *offp, int proto) 1725{ 1726 INIT_VNET_INET6(curvnet); 1727 struct pim *pim; /* pointer to a pim struct */ 1728 struct ip6_hdr *ip6; 1729 int pimlen; 1730 struct mbuf *m = *mp; 1731 int minlen; 1732 int off = *offp; 1733 1734 ++pim6stat.pim6s_rcv_total; 1735 1736 ip6 = mtod(m, struct ip6_hdr *); 1737 pimlen = m->m_pkthdr.len - *offp; 1738 1739 /* 1740 * Validate lengths 1741 */ 1742 if (pimlen < PIM_MINLEN) { 1743 ++pim6stat.pim6s_rcv_tooshort; 1744#ifdef MRT6DEBUG 1745 if (V_mrt6debug & DEBUG_PIM) 1746 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1747#endif 1748 m_freem(m); 1749 return (IPPROTO_DONE); 1750 } 1751 1752 /* 1753 * if the packet is at least as big as a REGISTER, go ahead 1754 * and grab the PIM REGISTER header size, to avoid another 1755 * possible m_pullup() later. 1756 * 1757 * PIM_MINLEN == pimhdr + u_int32 == 8 1758 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1759 */ 1760 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1761 1762 /* 1763 * Make sure that the IP6 and PIM headers in contiguous memory, and 1764 * possibly the PIM REGISTER header 1765 */ 1766#ifndef PULLDOWN_TEST 1767 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1768 /* adjust pointer */ 1769 ip6 = mtod(m, struct ip6_hdr *); 1770 1771 /* adjust mbuf to point to the PIM header */ 1772 pim = (struct pim *)((caddr_t)ip6 + off); 1773#else 1774 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1775 if (pim == NULL) { 1776 pim6stat.pim6s_rcv_tooshort++; 1777 return (IPPROTO_DONE); 1778 } 1779#endif 1780 1781#define PIM6_CHECKSUM 1782#ifdef PIM6_CHECKSUM 1783 { 1784 int cksumlen; 1785 1786 /* 1787 * Validate checksum. 1788 * If PIM REGISTER, exclude the data packet 1789 */ 1790 if (pim->pim_type == PIM_REGISTER) 1791 cksumlen = PIM_MINLEN; 1792 else 1793 cksumlen = pimlen; 1794 1795 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1796 ++pim6stat.pim6s_rcv_badsum; 1797#ifdef MRT6DEBUG 1798 if (V_mrt6debug & DEBUG_PIM) 1799 log(LOG_DEBUG, 1800 "pim6_input: invalid checksum\n"); 1801#endif 1802 m_freem(m); 1803 return (IPPROTO_DONE); 1804 } 1805 } 1806#endif /* PIM_CHECKSUM */ 1807 1808 /* PIM version check */ 1809 if (pim->pim_ver != PIM_VERSION) { 1810 ++pim6stat.pim6s_rcv_badversion; 1811#ifdef MRT6DEBUG 1812 log(LOG_ERR, 1813 "pim6_input: incorrect version %d, expecting %d\n", 1814 pim->pim_ver, PIM_VERSION); 1815#endif 1816 m_freem(m); 1817 return (IPPROTO_DONE); 1818 } 1819 1820 if (pim->pim_type == PIM_REGISTER) { 1821 /* 1822 * since this is a REGISTER, we'll make a copy of the register 1823 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1824 * routing daemon. 1825 */ 1826 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1827 1828 struct mbuf *mcp; 1829 struct ip6_hdr *eip6; 1830 u_int32_t *reghdr; 1831 int rc; 1832#ifdef MRT6DEBUG 1833 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1834#endif 1835 1836 ++pim6stat.pim6s_rcv_registers; 1837 1838 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1839#ifdef MRT6DEBUG 1840 if (V_mrt6debug & DEBUG_PIM) 1841 log(LOG_DEBUG, 1842 "pim6_input: register mif not set: %d\n", 1843 reg_mif_num); 1844#endif 1845 m_freem(m); 1846 return (IPPROTO_DONE); 1847 } 1848 1849 reghdr = (u_int32_t *)(pim + 1); 1850 1851 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1852 goto pim6_input_to_daemon; 1853 1854 /* 1855 * Validate length 1856 */ 1857 if (pimlen < PIM6_REG_MINLEN) { 1858 ++pim6stat.pim6s_rcv_tooshort; 1859 ++pim6stat.pim6s_rcv_badregisters; 1860#ifdef MRT6DEBUG 1861 log(LOG_ERR, 1862 "pim6_input: register packet size too " 1863 "small %d from %s\n", 1864 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1865#endif 1866 m_freem(m); 1867 return (IPPROTO_DONE); 1868 } 1869 1870 eip6 = (struct ip6_hdr *) (reghdr + 1); 1871#ifdef MRT6DEBUG 1872 if (V_mrt6debug & DEBUG_PIM) 1873 log(LOG_DEBUG, 1874 "pim6_input[register], eip6: %s -> %s, " 1875 "eip6 plen %d\n", 1876 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1877 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1878 ntohs(eip6->ip6_plen)); 1879#endif 1880 1881 /* verify the version number of the inner packet */ 1882 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1883 ++pim6stat.pim6s_rcv_badregisters; 1884#ifdef MRT6DEBUG 1885 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1886 "of the inner packet\n", 1887 (eip6->ip6_vfc & IPV6_VERSION)); 1888#endif 1889 m_freem(m); 1890 return (IPPROTO_NONE); 1891 } 1892 1893 /* verify the inner packet is destined to a mcast group */ 1894 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1895 ++pim6stat.pim6s_rcv_badregisters; 1896#ifdef MRT6DEBUG 1897 if (V_mrt6debug & DEBUG_PIM) 1898 log(LOG_DEBUG, 1899 "pim6_input: inner packet of register " 1900 "is not multicast %s\n", 1901 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1902#endif 1903 m_freem(m); 1904 return (IPPROTO_DONE); 1905 } 1906 1907 /* 1908 * make a copy of the whole header to pass to the daemon later. 1909 */ 1910 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1911 if (mcp == NULL) { 1912#ifdef MRT6DEBUG 1913 log(LOG_ERR, 1914 "pim6_input: pim register: " 1915 "could not copy register head\n"); 1916#endif 1917 m_freem(m); 1918 return (IPPROTO_DONE); 1919 } 1920 1921 /* 1922 * forward the inner ip6 packet; point m_data at the inner ip6. 1923 */ 1924 m_adj(m, off + PIM_MINLEN); 1925#ifdef MRT6DEBUG 1926 if (V_mrt6debug & DEBUG_PIM) { 1927 log(LOG_DEBUG, 1928 "pim6_input: forwarding decapsulated register: " 1929 "src %s, dst %s, mif %d\n", 1930 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1931 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1932 reg_mif_num); 1933 } 1934#endif 1935 1936 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1937 dst.sin6_family, 0); 1938 1939 /* prepare the register head to send to the mrouting daemon */ 1940 m = mcp; 1941 } 1942 1943 /* 1944 * Pass the PIM message up to the daemon; if it is a register message 1945 * pass the 'head' only up to the daemon. This includes the 1946 * encapsulator ip6 header, pim header, register header and the 1947 * encapsulated ip6 header. 1948 */ 1949 pim6_input_to_daemon: 1950 rip6_input(&m, offp, proto); 1951 return (IPPROTO_DONE); 1952} 1953