ip6_mroute.c revision 190012
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 190012 2009-03-19 01:43:03Z bms $"); 83 84#include "opt_inet.h" 85#include "opt_inet6.h" 86#include "opt_route.h" 87 88#include <sys/param.h> 89#include <sys/callout.h> 90#include <sys/errno.h> 91#include <sys/kernel.h> 92#include <sys/lock.h> 93#include <sys/malloc.h> 94#include <sys/mbuf.h> 95#include <sys/module.h> 96#include <sys/protosw.h> 97#include <sys/signalvar.h> 98#include <sys/socket.h> 99#include <sys/socketvar.h> 100#include <sys/sockio.h> 101#include <sys/sx.h> 102#include <sys/sysctl.h> 103#include <sys/syslog.h> 104#include <sys/systm.h> 105#include <sys/time.h> 106#include <sys/vimage.h> 107 108#include <net/if.h> 109#include <net/if_types.h> 110#include <net/raw_cb.h> 111#include <net/route.h> 112#include <net/vnet.h> 113 114#include <netinet/in.h> 115#include <netinet/in_var.h> 116#include <netinet/icmp6.h> 117#include <netinet/vinet.h> 118#include <netinet/ip_encap.h> 119 120#include <netinet/ip6.h> 121#include <netinet6/ip6_var.h> 122#include <netinet6/scope6_var.h> 123#include <netinet6/nd6.h> 124#include <netinet6/ip6_mroute.h> 125#include <netinet6/ip6protosw.h> 126#include <netinet6/pim6.h> 127#include <netinet6/pim6_var.h> 128#include <netinet6/vinet6.h> 129 130static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 131 132/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 133#define M_HASCL(m) ((m)->m_flags & M_EXT) 134 135static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 136static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 137static void pim6_init(void); 138static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 139static int set_pim6(int *); 140static int socket_send(struct socket *, struct mbuf *, 141 struct sockaddr_in6 *); 142 143extern struct domain inet6domain; 144 145static const struct encaptab *pim6_encap_cookie; 146static const struct ip6protosw in6_pim_protosw = { 147 .pr_type = SOCK_RAW, 148 .pr_domain = &inet6domain, 149 .pr_protocol = IPPROTO_PIM, 150 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 151 .pr_input = pim6_input, 152 .pr_output = rip6_output, 153 .pr_ctloutput = rip6_ctloutput, 154 .pr_init = pim6_init, 155 .pr_usrreqs = &rip6_usrreqs 156}; 157static int pim6_encapcheck(const struct mbuf *, int, int, void *); 158 159#ifdef VIMAGE_GLOBALS 160static int ip6_mrouter_ver; 161#endif 162 163SYSCTL_DECL(_net_inet6); 164SYSCTL_DECL(_net_inet6_ip6); 165SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 166 167static struct mrt6stat mrt6stat; 168SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 169 &mrt6stat, mrt6stat, 170 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 171 172#define NO_RTE_FOUND 0x1 173#define RTE_FOUND 0x2 174 175static struct mtx mrouter6_mtx; 176#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 177#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 178#define MROUTER6_LOCK_ASSERT() do { \ 179 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 180 NET_ASSERT_GIANT(); \ 181} while (0) 182#define MROUTER6_LOCK_INIT() \ 183 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 184#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 185 186static struct mf6c *mf6ctable[MF6CTBLSIZ]; 187SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 188 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 189 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 190 "netinet6/ip6_mroute.h)"); 191 192static struct mtx mfc6_mtx; 193#define MFC6_LOCK() mtx_lock(&mfc6_mtx) 194#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 195#define MFC6_LOCK_ASSERT() do { \ 196 mtx_assert(&mfc6_mtx, MA_OWNED); \ 197 NET_ASSERT_GIANT(); \ 198} while (0) 199#define MFC6_LOCK_INIT() \ 200 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 201#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 202 203static u_char n6expire[MF6CTBLSIZ]; 204 205static struct mif6 mif6table[MAXMIFS]; 206SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 207 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]", 208 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)"); 209 210static struct mtx mif6_mtx; 211#define MIF6_LOCK() mtx_lock(&mif6_mtx) 212#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 213#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 214#define MIF6_LOCK_INIT() \ 215 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 216#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 217 218#ifdef MRT6DEBUG 219#ifdef VIMAGE_GLOBALS 220static u_int mrt6debug = 0; /* debug level */ 221#endif 222#define DEBUG_MFC 0x02 223#define DEBUG_FORWARD 0x04 224#define DEBUG_EXPIRE 0x08 225#define DEBUG_XMIT 0x10 226#define DEBUG_REG 0x20 227#define DEBUG_PIM 0x40 228#endif 229 230static void expire_upcalls(void *); 231#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 232#define UPCALL_EXPIRE 6 /* number of timeouts */ 233 234/* 235 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 236 */ 237 238/* 239 * 'Interfaces' associated with decapsulator (so we can tell 240 * packets that went through it from ones that get reflected 241 * by a broken gateway). Different from IPv4 register_if, 242 * these interfaces are linked into the system ifnet list, 243 * because per-interface IPv6 statistics are maintained in 244 * ifp->if_afdata. But it does not have any routes point 245 * to them. I.e., packets can't be sent this way. They 246 * only exist as a placeholder for multicast source 247 * verification. 248 */ 249static struct ifnet *multicast_register_if6; 250 251#define ENCAP_HOPS 64 252 253/* 254 * Private variables. 255 */ 256static mifi_t nummifs = 0; 257static mifi_t reg_mif_num = (mifi_t)-1; 258 259static struct pim6stat pim6stat; 260SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 261 &pim6stat, pim6stat, 262 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 263 264#ifdef VIMAGE_GLOBALS 265static int pim6; 266#endif 267 268/* 269 * Hash function for a source, group entry 270 */ 271#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 272 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 273 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 274 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 275 276/* 277 * Find a route for a given origin IPv6 address and Multicast group address. 278 */ 279#define MF6CFIND(o, g, rt) do { \ 280 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 281 rt = NULL; \ 282 mrt6stat.mrt6s_mfc_lookups++; \ 283 while (_rt) { \ 284 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 285 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 286 (_rt->mf6c_stall == NULL)) { \ 287 rt = _rt; \ 288 break; \ 289 } \ 290 _rt = _rt->mf6c_next; \ 291 } \ 292 if (rt == NULL) { \ 293 mrt6stat.mrt6s_mfc_misses++; \ 294 } \ 295} while (/*CONSTCOND*/ 0) 296 297/* 298 * Macros to compute elapsed time efficiently 299 * Borrowed from Van Jacobson's scheduling code 300 * XXX: replace with timersub() ? 301 */ 302#define TV_DELTA(a, b, delta) do { \ 303 int xxs; \ 304 \ 305 delta = (a).tv_usec - (b).tv_usec; \ 306 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 307 switch (xxs) { \ 308 case 2: \ 309 delta += 1000000; \ 310 /* FALLTHROUGH */ \ 311 case 1: \ 312 delta += 1000000; \ 313 break; \ 314 default: \ 315 delta += (1000000 * xxs); \ 316 } \ 317 } \ 318} while (/*CONSTCOND*/ 0) 319 320/* XXX: replace with timercmp(a, b, <) ? */ 321#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 322 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 323 324#ifdef UPCALL_TIMING 325#define UPCALL_MAX 50 326static u_long upcall_data[UPCALL_MAX + 1]; 327static void collate(); 328#endif /* UPCALL_TIMING */ 329 330static int ip6_mrouter_init(struct socket *, int, int); 331static int add_m6fc(struct mf6cctl *); 332static int add_m6if(struct mif6ctl *); 333static int del_m6fc(struct mf6cctl *); 334static int del_m6if(mifi_t *); 335static int del_m6if_locked(mifi_t *); 336static int get_mif6_cnt(struct sioc_mif_req6 *); 337static int get_sg_cnt(struct sioc_sg_req6 *); 338 339static struct callout expire_upcalls_ch; 340 341int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 342int X_ip6_mrouter_done(void); 343int X_ip6_mrouter_set(struct socket *, struct sockopt *); 344int X_ip6_mrouter_get(struct socket *, struct sockopt *); 345int X_mrt6_ioctl(int, caddr_t); 346 347static void 348pim6_init(void) 349{ 350 INIT_VNET_INET6(curvnet); 351 352 V_ip6_mrouter_ver = 0; 353#ifdef MRT6DEBUG 354 V_mrt6debug = 0; /* debug level */ 355#endif 356} 357 358/* 359 * Handle MRT setsockopt commands to modify the multicast routing tables. 360 */ 361int 362X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 363{ 364 int error = 0; 365 int optval; 366 struct mif6ctl mifc; 367 struct mf6cctl mfcc; 368 mifi_t mifi; 369 370 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 371 return (EACCES); 372 373 switch (sopt->sopt_name) { 374 case MRT6_INIT: 375#ifdef MRT6_OINIT 376 case MRT6_OINIT: 377#endif 378 error = sooptcopyin(sopt, &optval, sizeof(optval), 379 sizeof(optval)); 380 if (error) 381 break; 382 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 383 break; 384 case MRT6_DONE: 385 error = X_ip6_mrouter_done(); 386 break; 387 case MRT6_ADD_MIF: 388 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 389 if (error) 390 break; 391 error = add_m6if(&mifc); 392 break; 393 case MRT6_ADD_MFC: 394 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 395 if (error) 396 break; 397 error = add_m6fc(&mfcc); 398 break; 399 case MRT6_DEL_MFC: 400 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 401 if (error) 402 break; 403 error = del_m6fc(&mfcc); 404 break; 405 case MRT6_DEL_MIF: 406 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 407 if (error) 408 break; 409 error = del_m6if(&mifi); 410 break; 411 case MRT6_PIM: 412 error = sooptcopyin(sopt, &optval, sizeof(optval), 413 sizeof(optval)); 414 if (error) 415 break; 416 error = set_pim6(&optval); 417 break; 418 default: 419 error = EOPNOTSUPP; 420 break; 421 } 422 423 return (error); 424} 425 426/* 427 * Handle MRT getsockopt commands 428 */ 429int 430X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 431{ 432 INIT_VNET_INET6(curvnet); 433 int error = 0; 434 435 if (so != ip6_mrouter) 436 return (EACCES); 437 438 switch (sopt->sopt_name) { 439 case MRT6_PIM: 440 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 441 break; 442 } 443 return (error); 444} 445 446/* 447 * Handle ioctl commands to obtain information from the cache 448 */ 449int 450X_mrt6_ioctl(int cmd, caddr_t data) 451{ 452 int ret; 453 454 ret = EINVAL; 455 456 switch (cmd) { 457 case SIOCGETSGCNT_IN6: 458 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 459 break; 460 461 case SIOCGETMIFCNT_IN6: 462 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 463 break; 464 465 default: 466 break; 467 } 468 469 return (ret); 470} 471 472/* 473 * returns the packet, byte, rpf-failure count for the source group provided 474 */ 475static int 476get_sg_cnt(struct sioc_sg_req6 *req) 477{ 478 struct mf6c *rt; 479 int ret; 480 481 ret = 0; 482 483 MFC6_LOCK(); 484 485 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 486 if (rt == NULL) { 487 ret = ESRCH; 488 } else { 489 req->pktcnt = rt->mf6c_pkt_cnt; 490 req->bytecnt = rt->mf6c_byte_cnt; 491 req->wrong_if = rt->mf6c_wrong_if; 492 } 493 494 MFC6_UNLOCK(); 495 496 return (ret); 497} 498 499/* 500 * returns the input and output packet and byte counts on the mif provided 501 */ 502static int 503get_mif6_cnt(struct sioc_mif_req6 *req) 504{ 505 mifi_t mifi; 506 int ret; 507 508 ret = 0; 509 mifi = req->mifi; 510 511 MIF6_LOCK(); 512 513 if (mifi >= nummifs) { 514 ret = EINVAL; 515 } else { 516 req->icount = mif6table[mifi].m6_pkt_in; 517 req->ocount = mif6table[mifi].m6_pkt_out; 518 req->ibytes = mif6table[mifi].m6_bytes_in; 519 req->obytes = mif6table[mifi].m6_bytes_out; 520 } 521 522 MIF6_UNLOCK(); 523 524 return (ret); 525} 526 527static int 528set_pim6(int *i) 529{ 530 INIT_VNET_INET6(curvnet); 531 if ((*i != 1) && (*i != 0)) 532 return (EINVAL); 533 534 V_pim6 = *i; 535 536 return (0); 537} 538 539/* 540 * Enable multicast routing 541 */ 542static int 543ip6_mrouter_init(struct socket *so, int v, int cmd) 544{ 545 INIT_VNET_INET6(curvnet); 546 547#ifdef MRT6DEBUG 548 if (V_mrt6debug) 549 log(LOG_DEBUG, 550 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 551 so->so_type, so->so_proto->pr_protocol); 552#endif 553 554 if (so->so_type != SOCK_RAW || 555 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 556 return (EOPNOTSUPP); 557 558 if (v != 1) 559 return (ENOPROTOOPT); 560 561 MROUTER6_LOCK(); 562 563 if (ip6_mrouter != NULL) { 564 MROUTER6_UNLOCK(); 565 return (EADDRINUSE); 566 } 567 568 ip6_mrouter = so; 569 V_ip6_mrouter_ver = cmd; 570 571 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 572 bzero((caddr_t)n6expire, sizeof(n6expire)); 573 574 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 575 576 callout_init(&expire_upcalls_ch, 0); 577 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 578 expire_upcalls, NULL); 579 580 MROUTER6_UNLOCK(); 581 582#ifdef MRT6DEBUG 583 if (V_mrt6debug) 584 log(LOG_DEBUG, "ip6_mrouter_init\n"); 585#endif 586 587 return (0); 588} 589 590/* 591 * Disable IPv6 multicast forwarding. 592 */ 593int 594X_ip6_mrouter_done(void) 595{ 596 INIT_VNET_INET6(curvnet); 597 mifi_t mifi; 598 int i; 599 struct mf6c *rt; 600 struct rtdetq *rte; 601 602 MROUTER6_LOCK(); 603 604 if (ip6_mrouter == NULL) { 605 MROUTER6_UNLOCK(); 606 return (EINVAL); 607 } 608 609 /* 610 * For each phyint in use, disable promiscuous reception of all IPv6 611 * multicasts. 612 */ 613 for (mifi = 0; mifi < nummifs; mifi++) { 614 if (mif6table[mifi].m6_ifp && 615 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 616 if_allmulti(mif6table[mifi].m6_ifp, 0); 617 } 618 } 619 bzero((caddr_t)mif6table, sizeof(mif6table)); 620 nummifs = 0; 621 622 V_pim6 = 0; /* used to stub out/in pim specific code */ 623 624 callout_stop(&expire_upcalls_ch); 625 626 /* 627 * Free all multicast forwarding cache entries. 628 */ 629 MFC6_LOCK(); 630 for (i = 0; i < MF6CTBLSIZ; i++) { 631 rt = mf6ctable[i]; 632 while (rt) { 633 struct mf6c *frt; 634 635 for (rte = rt->mf6c_stall; rte != NULL; ) { 636 struct rtdetq *n = rte->next; 637 638 m_free(rte->m); 639 free(rte, M_MRTABLE6); 640 rte = n; 641 } 642 frt = rt; 643 rt = rt->mf6c_next; 644 free(frt, M_MRTABLE6); 645 } 646 } 647 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 648 MFC6_UNLOCK(); 649 650 /* 651 * Reset register interface 652 */ 653 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 654 if_detach(multicast_register_if6); 655 if_free(multicast_register_if6); 656 reg_mif_num = (mifi_t)-1; 657 multicast_register_if6 = NULL; 658 } 659 660 ip6_mrouter = NULL; 661 V_ip6_mrouter_ver = 0; 662 663 MROUTER6_UNLOCK(); 664 665#ifdef MRT6DEBUG 666 if (V_mrt6debug) 667 log(LOG_DEBUG, "ip6_mrouter_done\n"); 668#endif 669 670 return (0); 671} 672 673static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 674 675/* 676 * Add a mif to the mif table 677 */ 678static int 679add_m6if(struct mif6ctl *mifcp) 680{ 681 INIT_VNET_NET(curvnet); 682 struct mif6 *mifp; 683 struct ifnet *ifp; 684 int error; 685 686 MIF6_LOCK(); 687 688 if (mifcp->mif6c_mifi >= MAXMIFS) { 689 MIF6_UNLOCK(); 690 return (EINVAL); 691 } 692 mifp = mif6table + mifcp->mif6c_mifi; 693 if (mifp->m6_ifp != NULL) { 694 MIF6_UNLOCK(); 695 return (EADDRINUSE); /* XXX: is it appropriate? */ 696 } 697 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 698 MIF6_UNLOCK(); 699 return (ENXIO); 700 } 701 702 ifp = ifnet_byindex(mifcp->mif6c_pifi); 703 704 if (mifcp->mif6c_flags & MIFF_REGISTER) { 705 if (reg_mif_num == (mifi_t)-1) { 706 ifp = if_alloc(IFT_OTHER); 707 708 if_initname(ifp, "register_mif", 0); 709 ifp->if_flags |= IFF_LOOPBACK; 710 if_attach(ifp); 711 multicast_register_if6 = ifp; 712 reg_mif_num = mifcp->mif6c_mifi; 713 /* 714 * it is impossible to guess the ifindex of the 715 * register interface. So mif6c_pifi is automatically 716 * calculated. 717 */ 718 mifcp->mif6c_pifi = ifp->if_index; 719 } else { 720 ifp = multicast_register_if6; 721 } 722 } else { 723 /* Make sure the interface supports multicast */ 724 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 725 MIF6_UNLOCK(); 726 return (EOPNOTSUPP); 727 } 728 729 error = if_allmulti(ifp, 1); 730 if (error) { 731 MIF6_UNLOCK(); 732 return (error); 733 } 734 } 735 736 mifp->m6_flags = mifcp->mif6c_flags; 737 mifp->m6_ifp = ifp; 738 739 /* initialize per mif pkt counters */ 740 mifp->m6_pkt_in = 0; 741 mifp->m6_pkt_out = 0; 742 mifp->m6_bytes_in = 0; 743 mifp->m6_bytes_out = 0; 744 bzero(&mifp->m6_route, sizeof(mifp->m6_route)); 745 746 /* Adjust nummifs up if the mifi is higher than nummifs */ 747 if (nummifs <= mifcp->mif6c_mifi) 748 nummifs = mifcp->mif6c_mifi + 1; 749 750 MIF6_UNLOCK(); 751 752#ifdef MRT6DEBUG 753 if (V_mrt6debug) 754 log(LOG_DEBUG, 755 "add_mif #%d, phyint %s\n", 756 mifcp->mif6c_mifi, 757 ifp->if_xname); 758#endif 759 760 return (0); 761} 762 763/* 764 * Delete a mif from the mif table 765 */ 766static int 767del_m6if_locked(mifi_t *mifip) 768{ 769 struct mif6 *mifp = mif6table + *mifip; 770 mifi_t mifi; 771 struct ifnet *ifp; 772 773 MIF6_LOCK_ASSERT(); 774 775 if (*mifip >= nummifs) 776 return (EINVAL); 777 if (mifp->m6_ifp == NULL) 778 return (EINVAL); 779 780 if (!(mifp->m6_flags & MIFF_REGISTER)) { 781 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 782 ifp = mifp->m6_ifp; 783 if_allmulti(ifp, 0); 784 } else { 785 if (reg_mif_num != (mifi_t)-1 && 786 multicast_register_if6 != NULL) { 787 if_detach(multicast_register_if6); 788 if_free(multicast_register_if6); 789 reg_mif_num = (mifi_t)-1; 790 multicast_register_if6 = NULL; 791 } 792 } 793 794 bzero((caddr_t)mifp, sizeof(*mifp)); 795 796 /* Adjust nummifs down */ 797 for (mifi = nummifs; mifi > 0; mifi--) 798 if (mif6table[mifi - 1].m6_ifp) 799 break; 800 nummifs = mifi; 801 802#ifdef MRT6DEBUG 803 if (V_mrt6debug) 804 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 805#endif 806 807 return (0); 808} 809 810static int 811del_m6if(mifi_t *mifip) 812{ 813 int cc; 814 815 MIF6_LOCK(); 816 cc = del_m6if_locked(mifip); 817 MIF6_UNLOCK(); 818 819 return (cc); 820} 821 822/* 823 * Add an mfc entry 824 */ 825static int 826add_m6fc(struct mf6cctl *mfccp) 827{ 828 struct mf6c *rt; 829 u_long hash; 830 struct rtdetq *rte; 831 u_short nstl; 832 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 833 834 MFC6_LOCK(); 835 836 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 837 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 838 839 /* If an entry already exists, just update the fields */ 840 if (rt) { 841#ifdef MRT6DEBUG 842 if (V_mrt6debug & DEBUG_MFC) { 843 log(LOG_DEBUG, 844 "add_m6fc no upcall h %d o %s g %s p %x\n", 845 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 846 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 847 mfccp->mf6cc_parent); 848 } 849#endif 850 851 rt->mf6c_parent = mfccp->mf6cc_parent; 852 rt->mf6c_ifset = mfccp->mf6cc_ifset; 853 854 MFC6_UNLOCK(); 855 return (0); 856 } 857 858 /* 859 * Find the entry for which the upcall was made and update 860 */ 861 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 862 mfccp->mf6cc_mcastgrp.sin6_addr); 863 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 864 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 865 &mfccp->mf6cc_origin.sin6_addr) && 866 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 867 &mfccp->mf6cc_mcastgrp.sin6_addr) && 868 (rt->mf6c_stall != NULL)) { 869 870 if (nstl++) 871 log(LOG_ERR, 872 "add_m6fc: %s o %s g %s p %x dbx %p\n", 873 "multiple kernel entries", 874 ip6_sprintf(ip6bufo, 875 &mfccp->mf6cc_origin.sin6_addr), 876 ip6_sprintf(ip6bufg, 877 &mfccp->mf6cc_mcastgrp.sin6_addr), 878 mfccp->mf6cc_parent, rt->mf6c_stall); 879 880#ifdef MRT6DEBUG 881 if (V_mrt6debug & DEBUG_MFC) 882 log(LOG_DEBUG, 883 "add_m6fc o %s g %s p %x dbg %x\n", 884 ip6_sprintf(ip6bufo, 885 &mfccp->mf6cc_origin.sin6_addr), 886 ip6_sprintf(ip6bufg, 887 &mfccp->mf6cc_mcastgrp.sin6_addr), 888 mfccp->mf6cc_parent, rt->mf6c_stall); 889#endif 890 891 rt->mf6c_origin = mfccp->mf6cc_origin; 892 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 893 rt->mf6c_parent = mfccp->mf6cc_parent; 894 rt->mf6c_ifset = mfccp->mf6cc_ifset; 895 /* initialize pkt counters per src-grp */ 896 rt->mf6c_pkt_cnt = 0; 897 rt->mf6c_byte_cnt = 0; 898 rt->mf6c_wrong_if = 0; 899 900 rt->mf6c_expire = 0; /* Don't clean this guy up */ 901 n6expire[hash]--; 902 903 /* free packets Qed at the end of this entry */ 904 for (rte = rt->mf6c_stall; rte != NULL; ) { 905 struct rtdetq *n = rte->next; 906 ip6_mdq(rte->m, rte->ifp, rt); 907 m_freem(rte->m); 908#ifdef UPCALL_TIMING 909 collate(&(rte->t)); 910#endif /* UPCALL_TIMING */ 911 free(rte, M_MRTABLE6); 912 rte = n; 913 } 914 rt->mf6c_stall = NULL; 915 } 916 } 917 918 /* 919 * It is possible that an entry is being inserted without an upcall 920 */ 921 if (nstl == 0) { 922#ifdef MRT6DEBUG 923 if (V_mrt6debug & DEBUG_MFC) 924 log(LOG_DEBUG, 925 "add_mfc no upcall h %d o %s g %s p %x\n", 926 hash, 927 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 928 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 929 mfccp->mf6cc_parent); 930#endif 931 932 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 933 934 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 935 &mfccp->mf6cc_origin.sin6_addr)&& 936 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 937 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 938 939 rt->mf6c_origin = mfccp->mf6cc_origin; 940 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 941 rt->mf6c_parent = mfccp->mf6cc_parent; 942 rt->mf6c_ifset = mfccp->mf6cc_ifset; 943 /* initialize pkt counters per src-grp */ 944 rt->mf6c_pkt_cnt = 0; 945 rt->mf6c_byte_cnt = 0; 946 rt->mf6c_wrong_if = 0; 947 948 if (rt->mf6c_expire) 949 n6expire[hash]--; 950 rt->mf6c_expire = 0; 951 } 952 } 953 if (rt == NULL) { 954 /* no upcall, so make a new entry */ 955 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 956 M_NOWAIT); 957 if (rt == NULL) { 958 MFC6_UNLOCK(); 959 return (ENOBUFS); 960 } 961 962 /* insert new entry at head of hash chain */ 963 rt->mf6c_origin = mfccp->mf6cc_origin; 964 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 965 rt->mf6c_parent = mfccp->mf6cc_parent; 966 rt->mf6c_ifset = mfccp->mf6cc_ifset; 967 /* initialize pkt counters per src-grp */ 968 rt->mf6c_pkt_cnt = 0; 969 rt->mf6c_byte_cnt = 0; 970 rt->mf6c_wrong_if = 0; 971 rt->mf6c_expire = 0; 972 rt->mf6c_stall = NULL; 973 974 /* link into table */ 975 rt->mf6c_next = mf6ctable[hash]; 976 mf6ctable[hash] = rt; 977 } 978 } 979 980 MFC6_UNLOCK(); 981 return (0); 982} 983 984#ifdef UPCALL_TIMING 985/* 986 * collect delay statistics on the upcalls 987 */ 988static void 989collate(struct timeval *t) 990{ 991 u_long d; 992 struct timeval tp; 993 u_long delta; 994 995 GET_TIME(tp); 996 997 if (TV_LT(*t, tp)) 998 { 999 TV_DELTA(tp, *t, delta); 1000 1001 d = delta >> 10; 1002 if (d > UPCALL_MAX) 1003 d = UPCALL_MAX; 1004 1005 ++upcall_data[d]; 1006 } 1007} 1008#endif /* UPCALL_TIMING */ 1009 1010/* 1011 * Delete an mfc entry 1012 */ 1013static int 1014del_m6fc(struct mf6cctl *mfccp) 1015{ 1016 struct sockaddr_in6 origin; 1017 struct sockaddr_in6 mcastgrp; 1018 struct mf6c *rt; 1019 struct mf6c **nptr; 1020 u_long hash; 1021 1022 origin = mfccp->mf6cc_origin; 1023 mcastgrp = mfccp->mf6cc_mcastgrp; 1024 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1025 1026#ifdef MRT6DEBUG 1027 if (V_mrt6debug & DEBUG_MFC) { 1028 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1029 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 1030 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1031 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1032 } 1033#endif 1034 1035 MFC6_LOCK(); 1036 1037 nptr = &mf6ctable[hash]; 1038 while ((rt = *nptr) != NULL) { 1039 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1040 &rt->mf6c_origin.sin6_addr) && 1041 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1042 &rt->mf6c_mcastgrp.sin6_addr) && 1043 rt->mf6c_stall == NULL) 1044 break; 1045 1046 nptr = &rt->mf6c_next; 1047 } 1048 if (rt == NULL) { 1049 MFC6_UNLOCK(); 1050 return (EADDRNOTAVAIL); 1051 } 1052 1053 *nptr = rt->mf6c_next; 1054 free(rt, M_MRTABLE6); 1055 1056 MFC6_UNLOCK(); 1057 1058 return (0); 1059} 1060 1061static int 1062socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1063{ 1064 1065 if (s) { 1066 if (sbappendaddr(&s->so_rcv, 1067 (struct sockaddr *)src, 1068 mm, (struct mbuf *)0) != 0) { 1069 sorwakeup(s); 1070 return (0); 1071 } 1072 } 1073 m_freem(mm); 1074 return (-1); 1075} 1076 1077/* 1078 * IPv6 multicast forwarding function. This function assumes that the packet 1079 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1080 * pointed to by "ifp", and the packet is to be relayed to other networks 1081 * that have members of the packet's destination IPv6 multicast group. 1082 * 1083 * The packet is returned unscathed to the caller, unless it is 1084 * erroneous, in which case a non-zero return value tells the caller to 1085 * discard it. 1086 * 1087 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1088 * this function is called in the originating context (i.e., not when 1089 * forwarding a packet from other node). ip6_output(), which is currently the 1090 * only function that calls this function is called in the originating context, 1091 * explicitly ensures this condition. It is caller's responsibility to ensure 1092 * that if this function is called from somewhere else in the originating 1093 * context in the future. 1094 */ 1095int 1096X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1097{ 1098 INIT_VNET_INET6(curvnet); 1099 struct mf6c *rt; 1100 struct mif6 *mifp; 1101 struct mbuf *mm; 1102 mifi_t mifi; 1103 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1104 1105#ifdef MRT6DEBUG 1106 if (V_mrt6debug & DEBUG_FORWARD) 1107 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1108 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1109 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1110 ifp->if_index); 1111#endif 1112 1113 /* 1114 * Don't forward a packet with Hop limit of zero or one, 1115 * or a packet destined to a local-only group. 1116 */ 1117 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1118 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1119 return (0); 1120 ip6->ip6_hlim--; 1121 1122 /* 1123 * Source address check: do not forward packets with unspecified 1124 * source. It was discussed in July 2000, on ipngwg mailing list. 1125 * This is rather more serious than unicast cases, because some 1126 * MLD packets can be sent with the unspecified source address 1127 * (although such packets must normally set 1 to the hop limit field). 1128 */ 1129 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1130 V_ip6stat.ip6s_cantforward++; 1131 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1132 V_ip6_log_time = time_second; 1133 log(LOG_DEBUG, 1134 "cannot forward " 1135 "from %s to %s nxt %d received on %s\n", 1136 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1137 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1138 ip6->ip6_nxt, 1139 if_name(m->m_pkthdr.rcvif)); 1140 } 1141 return (0); 1142 } 1143 1144 MFC6_LOCK(); 1145 1146 /* 1147 * Determine forwarding mifs from the forwarding cache table 1148 */ 1149 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1150 1151 /* Entry exists, so forward if necessary */ 1152 if (rt) { 1153 MFC6_UNLOCK(); 1154 return (ip6_mdq(m, ifp, rt)); 1155 } else { 1156 /* 1157 * If we don't have a route for packet's origin, 1158 * Make a copy of the packet & 1159 * send message to routing daemon 1160 */ 1161 1162 struct mbuf *mb0; 1163 struct rtdetq *rte; 1164 u_long hash; 1165/* int i, npkts;*/ 1166#ifdef UPCALL_TIMING 1167 struct timeval tp; 1168 1169 GET_TIME(tp); 1170#endif /* UPCALL_TIMING */ 1171 1172 mrt6stat.mrt6s_no_route++; 1173#ifdef MRT6DEBUG 1174 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1175 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1176 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1177 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1178#endif 1179 1180 /* 1181 * Allocate mbufs early so that we don't do extra work if we 1182 * are just going to fail anyway. 1183 */ 1184 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1185 M_NOWAIT); 1186 if (rte == NULL) { 1187 MFC6_UNLOCK(); 1188 return (ENOBUFS); 1189 } 1190 mb0 = m_copy(m, 0, M_COPYALL); 1191 /* 1192 * Pullup packet header if needed before storing it, 1193 * as other references may modify it in the meantime. 1194 */ 1195 if (mb0 && 1196 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1197 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1198 if (mb0 == NULL) { 1199 free(rte, M_MRTABLE6); 1200 MFC6_UNLOCK(); 1201 return (ENOBUFS); 1202 } 1203 1204 /* is there an upcall waiting for this packet? */ 1205 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1206 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1207 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1208 &rt->mf6c_origin.sin6_addr) && 1209 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1210 &rt->mf6c_mcastgrp.sin6_addr) && 1211 (rt->mf6c_stall != NULL)) 1212 break; 1213 } 1214 1215 if (rt == NULL) { 1216 struct mrt6msg *im; 1217#ifdef MRT6_OINIT 1218 struct omrt6msg *oim; 1219#endif 1220 1221 /* no upcall, so make a new entry */ 1222 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1223 M_NOWAIT); 1224 if (rt == NULL) { 1225 free(rte, M_MRTABLE6); 1226 m_freem(mb0); 1227 MFC6_UNLOCK(); 1228 return (ENOBUFS); 1229 } 1230 /* 1231 * Make a copy of the header to send to the user 1232 * level process 1233 */ 1234 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1235 1236 if (mm == NULL) { 1237 free(rte, M_MRTABLE6); 1238 m_freem(mb0); 1239 free(rt, M_MRTABLE6); 1240 MFC6_UNLOCK(); 1241 return (ENOBUFS); 1242 } 1243 1244 /* 1245 * Send message to routing daemon 1246 */ 1247 sin6.sin6_addr = ip6->ip6_src; 1248 1249 im = NULL; 1250#ifdef MRT6_OINIT 1251 oim = NULL; 1252#endif 1253 switch (V_ip6_mrouter_ver) { 1254#ifdef MRT6_OINIT 1255 case MRT6_OINIT: 1256 oim = mtod(mm, struct omrt6msg *); 1257 oim->im6_msgtype = MRT6MSG_NOCACHE; 1258 oim->im6_mbz = 0; 1259 break; 1260#endif 1261 case MRT6_INIT: 1262 im = mtod(mm, struct mrt6msg *); 1263 im->im6_msgtype = MRT6MSG_NOCACHE; 1264 im->im6_mbz = 0; 1265 break; 1266 default: 1267 free(rte, M_MRTABLE6); 1268 m_freem(mb0); 1269 free(rt, M_MRTABLE6); 1270 MFC6_UNLOCK(); 1271 return (EINVAL); 1272 } 1273 1274#ifdef MRT6DEBUG 1275 if (V_mrt6debug & DEBUG_FORWARD) 1276 log(LOG_DEBUG, 1277 "getting the iif info in the kernel\n"); 1278#endif 1279 1280 for (mifp = mif6table, mifi = 0; 1281 mifi < nummifs && mifp->m6_ifp != ifp; 1282 mifp++, mifi++) 1283 ; 1284 1285 switch (V_ip6_mrouter_ver) { 1286#ifdef MRT6_OINIT 1287 case MRT6_OINIT: 1288 oim->im6_mif = mifi; 1289 break; 1290#endif 1291 case MRT6_INIT: 1292 im->im6_mif = mifi; 1293 break; 1294 } 1295 1296 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1297 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1298 "socket queue full\n"); 1299 mrt6stat.mrt6s_upq_sockfull++; 1300 free(rte, M_MRTABLE6); 1301 m_freem(mb0); 1302 free(rt, M_MRTABLE6); 1303 MFC6_UNLOCK(); 1304 return (ENOBUFS); 1305 } 1306 1307 mrt6stat.mrt6s_upcalls++; 1308 1309 /* insert new entry at head of hash chain */ 1310 bzero(rt, sizeof(*rt)); 1311 rt->mf6c_origin.sin6_family = AF_INET6; 1312 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1313 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1314 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1315 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1316 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1317 rt->mf6c_expire = UPCALL_EXPIRE; 1318 n6expire[hash]++; 1319 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1320 1321 /* link into table */ 1322 rt->mf6c_next = mf6ctable[hash]; 1323 mf6ctable[hash] = rt; 1324 /* Add this entry to the end of the queue */ 1325 rt->mf6c_stall = rte; 1326 } else { 1327 /* determine if q has overflowed */ 1328 struct rtdetq **p; 1329 int npkts = 0; 1330 1331 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1332 if (++npkts > MAX_UPQ6) { 1333 mrt6stat.mrt6s_upq_ovflw++; 1334 free(rte, M_MRTABLE6); 1335 m_freem(mb0); 1336 MFC6_UNLOCK(); 1337 return (0); 1338 } 1339 1340 /* Add this entry to the end of the queue */ 1341 *p = rte; 1342 } 1343 1344 rte->next = NULL; 1345 rte->m = mb0; 1346 rte->ifp = ifp; 1347#ifdef UPCALL_TIMING 1348 rte->t = tp; 1349#endif /* UPCALL_TIMING */ 1350 1351 MFC6_UNLOCK(); 1352 1353 return (0); 1354 } 1355} 1356 1357/* 1358 * Clean up cache entries if upcalls are not serviced 1359 * Call from the Slow Timeout mechanism, every half second. 1360 */ 1361static void 1362expire_upcalls(void *unused) 1363{ 1364 struct rtdetq *rte; 1365 struct mf6c *mfc, **nptr; 1366 int i; 1367 1368 MFC6_LOCK(); 1369 for (i = 0; i < MF6CTBLSIZ; i++) { 1370 if (n6expire[i] == 0) 1371 continue; 1372 nptr = &mf6ctable[i]; 1373 while ((mfc = *nptr) != NULL) { 1374 rte = mfc->mf6c_stall; 1375 /* 1376 * Skip real cache entries 1377 * Make sure it wasn't marked to not expire (shouldn't happen) 1378 * If it expires now 1379 */ 1380 if (rte != NULL && 1381 mfc->mf6c_expire != 0 && 1382 --mfc->mf6c_expire == 0) { 1383#ifdef MRT6DEBUG 1384 if (V_mrt6debug & DEBUG_EXPIRE) { 1385 char ip6bufo[INET6_ADDRSTRLEN]; 1386 char ip6bufg[INET6_ADDRSTRLEN]; 1387 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1388 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1389 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1390 } 1391#endif 1392 /* 1393 * drop all the packets 1394 * free the mbuf with the pkt, if, timing info 1395 */ 1396 do { 1397 struct rtdetq *n = rte->next; 1398 m_freem(rte->m); 1399 free(rte, M_MRTABLE6); 1400 rte = n; 1401 } while (rte != NULL); 1402 mrt6stat.mrt6s_cache_cleanups++; 1403 n6expire[i]--; 1404 1405 *nptr = mfc->mf6c_next; 1406 free(mfc, M_MRTABLE6); 1407 } else { 1408 nptr = &mfc->mf6c_next; 1409 } 1410 } 1411 } 1412 MFC6_UNLOCK(); 1413 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1414 expire_upcalls, NULL); 1415} 1416 1417/* 1418 * Packet forwarding routine once entry in the cache is made 1419 */ 1420static int 1421ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1422{ 1423 INIT_VNET_INET6(curvnet); 1424 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1425 mifi_t mifi, iif; 1426 struct mif6 *mifp; 1427 int plen = m->m_pkthdr.len; 1428 struct in6_addr src0, dst0; /* copies for local work */ 1429 u_int32_t iszone, idzone, oszone, odzone; 1430 int error = 0; 1431 1432/* 1433 * Macro to send packet on mif. Since RSVP packets don't get counted on 1434 * input, they shouldn't get counted on output, so statistics keeping is 1435 * separate. 1436 */ 1437 1438#define MC6_SEND(ip6, mifp, m) do { \ 1439 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1440 register_send((ip6), (mifp), (m)); \ 1441 else \ 1442 phyint_send((ip6), (mifp), (m)); \ 1443} while (/*CONSTCOND*/ 0) 1444 1445 /* 1446 * Don't forward if it didn't arrive from the parent mif 1447 * for its origin. 1448 */ 1449 mifi = rt->mf6c_parent; 1450 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1451 /* came in the wrong interface */ 1452#ifdef MRT6DEBUG 1453 if (V_mrt6debug & DEBUG_FORWARD) 1454 log(LOG_DEBUG, 1455 "wrong if: ifid %d mifi %d mififid %x\n", 1456 ifp->if_index, mifi, 1457 mif6table[mifi].m6_ifp->if_index); 1458#endif 1459 mrt6stat.mrt6s_wrong_if++; 1460 rt->mf6c_wrong_if++; 1461 /* 1462 * If we are doing PIM processing, and we are forwarding 1463 * packets on this interface, send a message to the 1464 * routing daemon. 1465 */ 1466 /* have to make sure this is a valid mif */ 1467 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1468 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1469 /* 1470 * Check the M_LOOP flag to avoid an 1471 * unnecessary PIM assert. 1472 * XXX: M_LOOP is an ad-hoc hack... 1473 */ 1474 static struct sockaddr_in6 sin6 = 1475 { sizeof(sin6), AF_INET6 }; 1476 1477 struct mbuf *mm; 1478 struct mrt6msg *im; 1479#ifdef MRT6_OINIT 1480 struct omrt6msg *oim; 1481#endif 1482 1483 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1484 if (mm && 1485 (M_HASCL(mm) || 1486 mm->m_len < sizeof(struct ip6_hdr))) 1487 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1488 if (mm == NULL) 1489 return (ENOBUFS); 1490 1491#ifdef MRT6_OINIT 1492 oim = NULL; 1493#endif 1494 im = NULL; 1495 switch (V_ip6_mrouter_ver) { 1496#ifdef MRT6_OINIT 1497 case MRT6_OINIT: 1498 oim = mtod(mm, struct omrt6msg *); 1499 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1500 oim->im6_mbz = 0; 1501 break; 1502#endif 1503 case MRT6_INIT: 1504 im = mtod(mm, struct mrt6msg *); 1505 im->im6_msgtype = MRT6MSG_WRONGMIF; 1506 im->im6_mbz = 0; 1507 break; 1508 default: 1509 m_freem(mm); 1510 return (EINVAL); 1511 } 1512 1513 for (mifp = mif6table, iif = 0; 1514 iif < nummifs && mifp && 1515 mifp->m6_ifp != ifp; 1516 mifp++, iif++) 1517 ; 1518 1519 switch (V_ip6_mrouter_ver) { 1520#ifdef MRT6_OINIT 1521 case MRT6_OINIT: 1522 oim->im6_mif = iif; 1523 sin6.sin6_addr = oim->im6_src; 1524 break; 1525#endif 1526 case MRT6_INIT: 1527 im->im6_mif = iif; 1528 sin6.sin6_addr = im->im6_src; 1529 break; 1530 } 1531 1532 mrt6stat.mrt6s_upcalls++; 1533 1534 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1535#ifdef MRT6DEBUG 1536 if (V_mrt6debug) 1537 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1538#endif 1539 ++mrt6stat.mrt6s_upq_sockfull; 1540 return (ENOBUFS); 1541 } /* if socket Q full */ 1542 } /* if PIM */ 1543 return (0); 1544 } /* if wrong iif */ 1545 1546 /* If I sourced this packet, it counts as output, else it was input. */ 1547 if (m->m_pkthdr.rcvif == NULL) { 1548 /* XXX: is rcvif really NULL when output?? */ 1549 mif6table[mifi].m6_pkt_out++; 1550 mif6table[mifi].m6_bytes_out += plen; 1551 } else { 1552 mif6table[mifi].m6_pkt_in++; 1553 mif6table[mifi].m6_bytes_in += plen; 1554 } 1555 rt->mf6c_pkt_cnt++; 1556 rt->mf6c_byte_cnt += plen; 1557 1558 /* 1559 * For each mif, forward a copy of the packet if there are group 1560 * members downstream on the interface. 1561 */ 1562 src0 = ip6->ip6_src; 1563 dst0 = ip6->ip6_dst; 1564 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1565 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1566 V_ip6stat.ip6s_badscope++; 1567 return (error); 1568 } 1569 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1570 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1571 /* 1572 * check if the outgoing packet is going to break 1573 * a scope boundary. 1574 * XXX For packets through PIM register tunnel 1575 * interface, we believe a routing daemon. 1576 */ 1577 if (!(mif6table[rt->mf6c_parent].m6_flags & 1578 MIFF_REGISTER) && 1579 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1580 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1581 &oszone) || 1582 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1583 &odzone) || 1584 iszone != oszone || 1585 idzone != odzone) { 1586 V_ip6stat.ip6s_badscope++; 1587 continue; 1588 } 1589 } 1590 1591 mifp->m6_pkt_out++; 1592 mifp->m6_bytes_out += plen; 1593 MC6_SEND(ip6, mifp, m); 1594 } 1595 } 1596 return (0); 1597} 1598 1599static void 1600phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1601{ 1602 INIT_VNET_INET6(curvnet); 1603 struct mbuf *mb_copy; 1604 struct ifnet *ifp = mifp->m6_ifp; 1605 int error = 0; 1606 struct in6_multi *in6m; 1607 struct sockaddr_in6 *dst6; 1608 u_long linkmtu; 1609 1610 /* 1611 * Make a new reference to the packet; make sure that 1612 * the IPv6 header is actually copied, not just referenced, 1613 * so that ip6_output() only scribbles on the copy. 1614 */ 1615 mb_copy = m_copy(m, 0, M_COPYALL); 1616 if (mb_copy && 1617 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1618 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1619 if (mb_copy == NULL) { 1620 return; 1621 } 1622 /* set MCAST flag to the outgoing packet */ 1623 mb_copy->m_flags |= M_MCAST; 1624 1625 /* 1626 * If we sourced the packet, call ip6_output since we may devide 1627 * the packet into fragments when the packet is too big for the 1628 * outgoing interface. 1629 * Otherwise, we can simply send the packet to the interface 1630 * sending queue. 1631 */ 1632 if (m->m_pkthdr.rcvif == NULL) { 1633 struct ip6_moptions im6o; 1634 1635 im6o.im6o_multicast_ifp = ifp; 1636 /* XXX: ip6_output will override ip6->ip6_hlim */ 1637 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1638 im6o.im6o_multicast_loop = 1; 1639 error = ip6_output(mb_copy, NULL, &mifp->m6_route, 1640 IPV6_FORWARDING, &im6o, NULL, NULL); 1641 1642#ifdef MRT6DEBUG 1643 if (V_mrt6debug & DEBUG_XMIT) 1644 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1645 mifp - mif6table, error); 1646#endif 1647 return; 1648 } 1649 1650 /* 1651 * If we belong to the destination multicast group 1652 * on the outgoing interface, loop back a copy. 1653 */ 1654 dst6 = &mifp->m6_route.ro_dst; 1655 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1656 if (in6m != NULL) { 1657 dst6->sin6_len = sizeof(struct sockaddr_in6); 1658 dst6->sin6_family = AF_INET6; 1659 dst6->sin6_addr = ip6->ip6_dst; 1660 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst); 1661 } 1662 /* 1663 * Put the packet into the sending queue of the outgoing interface 1664 * if it would fit in the MTU of the interface. 1665 */ 1666 linkmtu = IN6_LINKMTU(ifp); 1667 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1668 dst6->sin6_len = sizeof(struct sockaddr_in6); 1669 dst6->sin6_family = AF_INET6; 1670 dst6->sin6_addr = ip6->ip6_dst; 1671 /* 1672 * We just call if_output instead of nd6_output here, since 1673 * we need no ND for a multicast forwarded packet...right? 1674 */ 1675 error = (*ifp->if_output)(ifp, mb_copy, 1676 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL); 1677#ifdef MRT6DEBUG 1678 if (V_mrt6debug & DEBUG_XMIT) 1679 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1680 mifp - mif6table, error); 1681#endif 1682 } else { 1683 /* 1684 * pMTU discovery is intentionally disabled by default, since 1685 * various router may notify pMTU in multicast, which can be 1686 * a DDoS to a router 1687 */ 1688 if (V_ip6_mcast_pmtu) 1689 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1690 else { 1691#ifdef MRT6DEBUG 1692 if (V_mrt6debug & DEBUG_XMIT) { 1693 char ip6bufs[INET6_ADDRSTRLEN]; 1694 char ip6bufd[INET6_ADDRSTRLEN]; 1695 log(LOG_DEBUG, 1696 "phyint_send: packet too big on %s o %s " 1697 "g %s size %d(discarded)\n", 1698 if_name(ifp), 1699 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1700 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1701 mb_copy->m_pkthdr.len); 1702 } 1703#endif /* MRT6DEBUG */ 1704 m_freem(mb_copy); /* simply discard the packet */ 1705 } 1706 } 1707} 1708 1709static int 1710register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1711{ 1712 struct mbuf *mm; 1713 int i, len = m->m_pkthdr.len; 1714 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1715 struct mrt6msg *im6; 1716 1717#ifdef MRT6DEBUG 1718 if (V_mrt6debug) { 1719 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1720 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1721 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1722 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1723 } 1724#endif 1725 ++pim6stat.pim6s_snd_registers; 1726 1727 /* Make a copy of the packet to send to the user level process */ 1728 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1729 if (mm == NULL) 1730 return (ENOBUFS); 1731 mm->m_pkthdr.rcvif = NULL; 1732 mm->m_data += max_linkhdr; 1733 mm->m_len = sizeof(struct ip6_hdr); 1734 1735 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1736 m_freem(mm); 1737 return (ENOBUFS); 1738 } 1739 i = MHLEN - M_LEADINGSPACE(mm); 1740 if (i > len) 1741 i = len; 1742 mm = m_pullup(mm, i); 1743 if (mm == NULL) 1744 return (ENOBUFS); 1745/* TODO: check it! */ 1746 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1747 1748 /* 1749 * Send message to routing daemon 1750 */ 1751 sin6.sin6_addr = ip6->ip6_src; 1752 1753 im6 = mtod(mm, struct mrt6msg *); 1754 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1755 im6->im6_mbz = 0; 1756 1757 im6->im6_mif = mif - mif6table; 1758 1759 /* iif info is not given for reg. encap.n */ 1760 mrt6stat.mrt6s_upcalls++; 1761 1762 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1763#ifdef MRT6DEBUG 1764 if (V_mrt6debug) 1765 log(LOG_WARNING, 1766 "register_send: ip6_mrouter socket queue full\n"); 1767#endif 1768 ++mrt6stat.mrt6s_upq_sockfull; 1769 return (ENOBUFS); 1770 } 1771 return (0); 1772} 1773 1774/* 1775 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1776 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1777 * into the kernel. 1778 */ 1779static int 1780pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1781{ 1782 1783#ifdef DIAGNOSTIC 1784 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1785#endif 1786 if (proto != IPPROTO_PIM) 1787 return 0; /* not for us; reject the datagram. */ 1788 1789 return 64; /* claim the datagram. */ 1790} 1791 1792/* 1793 * PIM sparse mode hook 1794 * Receives the pim control messages, and passes them up to the listening 1795 * socket, using rip6_input. 1796 * The only message processed is the REGISTER pim message; the pim header 1797 * is stripped off, and the inner packet is passed to register_mforward. 1798 */ 1799int 1800pim6_input(struct mbuf **mp, int *offp, int proto) 1801{ 1802 INIT_VNET_INET6(curvnet); 1803 struct pim *pim; /* pointer to a pim struct */ 1804 struct ip6_hdr *ip6; 1805 int pimlen; 1806 struct mbuf *m = *mp; 1807 int minlen; 1808 int off = *offp; 1809 1810 ++pim6stat.pim6s_rcv_total; 1811 1812 ip6 = mtod(m, struct ip6_hdr *); 1813 pimlen = m->m_pkthdr.len - *offp; 1814 1815 /* 1816 * Validate lengths 1817 */ 1818 if (pimlen < PIM_MINLEN) { 1819 ++pim6stat.pim6s_rcv_tooshort; 1820#ifdef MRT6DEBUG 1821 if (V_mrt6debug & DEBUG_PIM) 1822 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1823#endif 1824 m_freem(m); 1825 return (IPPROTO_DONE); 1826 } 1827 1828 /* 1829 * if the packet is at least as big as a REGISTER, go ahead 1830 * and grab the PIM REGISTER header size, to avoid another 1831 * possible m_pullup() later. 1832 * 1833 * PIM_MINLEN == pimhdr + u_int32 == 8 1834 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1835 */ 1836 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1837 1838 /* 1839 * Make sure that the IP6 and PIM headers in contiguous memory, and 1840 * possibly the PIM REGISTER header 1841 */ 1842#ifndef PULLDOWN_TEST 1843 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1844 /* adjust pointer */ 1845 ip6 = mtod(m, struct ip6_hdr *); 1846 1847 /* adjust mbuf to point to the PIM header */ 1848 pim = (struct pim *)((caddr_t)ip6 + off); 1849#else 1850 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1851 if (pim == NULL) { 1852 pim6stat.pim6s_rcv_tooshort++; 1853 return (IPPROTO_DONE); 1854 } 1855#endif 1856 1857#define PIM6_CHECKSUM 1858#ifdef PIM6_CHECKSUM 1859 { 1860 int cksumlen; 1861 1862 /* 1863 * Validate checksum. 1864 * If PIM REGISTER, exclude the data packet 1865 */ 1866 if (pim->pim_type == PIM_REGISTER) 1867 cksumlen = PIM_MINLEN; 1868 else 1869 cksumlen = pimlen; 1870 1871 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1872 ++pim6stat.pim6s_rcv_badsum; 1873#ifdef MRT6DEBUG 1874 if (V_mrt6debug & DEBUG_PIM) 1875 log(LOG_DEBUG, 1876 "pim6_input: invalid checksum\n"); 1877#endif 1878 m_freem(m); 1879 return (IPPROTO_DONE); 1880 } 1881 } 1882#endif /* PIM_CHECKSUM */ 1883 1884 /* PIM version check */ 1885 if (pim->pim_ver != PIM_VERSION) { 1886 ++pim6stat.pim6s_rcv_badversion; 1887#ifdef MRT6DEBUG 1888 log(LOG_ERR, 1889 "pim6_input: incorrect version %d, expecting %d\n", 1890 pim->pim_ver, PIM_VERSION); 1891#endif 1892 m_freem(m); 1893 return (IPPROTO_DONE); 1894 } 1895 1896 if (pim->pim_type == PIM_REGISTER) { 1897 /* 1898 * since this is a REGISTER, we'll make a copy of the register 1899 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1900 * routing daemon. 1901 */ 1902 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1903 1904 struct mbuf *mcp; 1905 struct ip6_hdr *eip6; 1906 u_int32_t *reghdr; 1907 int rc; 1908#ifdef MRT6DEBUG 1909 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1910#endif 1911 1912 ++pim6stat.pim6s_rcv_registers; 1913 1914 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1915#ifdef MRT6DEBUG 1916 if (V_mrt6debug & DEBUG_PIM) 1917 log(LOG_DEBUG, 1918 "pim6_input: register mif not set: %d\n", 1919 reg_mif_num); 1920#endif 1921 m_freem(m); 1922 return (IPPROTO_DONE); 1923 } 1924 1925 reghdr = (u_int32_t *)(pim + 1); 1926 1927 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1928 goto pim6_input_to_daemon; 1929 1930 /* 1931 * Validate length 1932 */ 1933 if (pimlen < PIM6_REG_MINLEN) { 1934 ++pim6stat.pim6s_rcv_tooshort; 1935 ++pim6stat.pim6s_rcv_badregisters; 1936#ifdef MRT6DEBUG 1937 log(LOG_ERR, 1938 "pim6_input: register packet size too " 1939 "small %d from %s\n", 1940 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1941#endif 1942 m_freem(m); 1943 return (IPPROTO_DONE); 1944 } 1945 1946 eip6 = (struct ip6_hdr *) (reghdr + 1); 1947#ifdef MRT6DEBUG 1948 if (V_mrt6debug & DEBUG_PIM) 1949 log(LOG_DEBUG, 1950 "pim6_input[register], eip6: %s -> %s, " 1951 "eip6 plen %d\n", 1952 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1953 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1954 ntohs(eip6->ip6_plen)); 1955#endif 1956 1957 /* verify the version number of the inner packet */ 1958 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1959 ++pim6stat.pim6s_rcv_badregisters; 1960#ifdef MRT6DEBUG 1961 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1962 "of the inner packet\n", 1963 (eip6->ip6_vfc & IPV6_VERSION)); 1964#endif 1965 m_freem(m); 1966 return (IPPROTO_NONE); 1967 } 1968 1969 /* verify the inner packet is destined to a mcast group */ 1970 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1971 ++pim6stat.pim6s_rcv_badregisters; 1972#ifdef MRT6DEBUG 1973 if (V_mrt6debug & DEBUG_PIM) 1974 log(LOG_DEBUG, 1975 "pim6_input: inner packet of register " 1976 "is not multicast %s\n", 1977 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1978#endif 1979 m_freem(m); 1980 return (IPPROTO_DONE); 1981 } 1982 1983 /* 1984 * make a copy of the whole header to pass to the daemon later. 1985 */ 1986 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1987 if (mcp == NULL) { 1988#ifdef MRT6DEBUG 1989 log(LOG_ERR, 1990 "pim6_input: pim register: " 1991 "could not copy register head\n"); 1992#endif 1993 m_freem(m); 1994 return (IPPROTO_DONE); 1995 } 1996 1997 /* 1998 * forward the inner ip6 packet; point m_data at the inner ip6. 1999 */ 2000 m_adj(m, off + PIM_MINLEN); 2001#ifdef MRT6DEBUG 2002 if (V_mrt6debug & DEBUG_PIM) { 2003 log(LOG_DEBUG, 2004 "pim6_input: forwarding decapsulated register: " 2005 "src %s, dst %s, mif %d\n", 2006 ip6_sprintf(ip6bufs, &eip6->ip6_src), 2007 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 2008 reg_mif_num); 2009 } 2010#endif 2011 2012 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 2013 dst.sin6_family, 0); 2014 2015 /* prepare the register head to send to the mrouting daemon */ 2016 m = mcp; 2017 } 2018 2019 /* 2020 * Pass the PIM message up to the daemon; if it is a register message 2021 * pass the 'head' only up to the daemon. This includes the 2022 * encapsulator ip6 header, pim header, register header and the 2023 * encapsulated ip6 header. 2024 */ 2025 pim6_input_to_daemon: 2026 rip6_input(&m, offp, proto); 2027 return (IPPROTO_DONE); 2028} 2029 2030static int 2031ip6_mroute_modevent(module_t mod, int type, void *unused) 2032{ 2033 2034 switch (type) { 2035 case MOD_LOAD: 2036 MROUTER6_LOCK_INIT(); 2037 MFC6_LOCK_INIT(); 2038 MIF6_LOCK_INIT(); 2039 2040 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 2041 pim6_encapcheck, 2042 (const struct protosw *)&in6_pim_protosw, NULL); 2043 if (pim6_encap_cookie == NULL) { 2044 printf("ip6_mroute: unable to attach pim6 encap\n"); 2045 MIF6_LOCK_DESTROY(); 2046 MFC6_LOCK_DESTROY(); 2047 MROUTER6_LOCK_DESTROY(); 2048 return (EINVAL); 2049 } 2050 2051 ip6_mforward = X_ip6_mforward; 2052 ip6_mrouter_done = X_ip6_mrouter_done; 2053 ip6_mrouter_get = X_ip6_mrouter_get; 2054 ip6_mrouter_set = X_ip6_mrouter_set; 2055 mrt6_ioctl = X_mrt6_ioctl; 2056 break; 2057 2058 case MOD_UNLOAD: 2059 if (ip6_mrouter != NULL) 2060 return EINVAL; 2061 2062 if (pim6_encap_cookie) { 2063 encap_detach(pim6_encap_cookie); 2064 pim6_encap_cookie = NULL; 2065 } 2066 X_ip6_mrouter_done(); 2067 ip6_mforward = NULL; 2068 ip6_mrouter_done = NULL; 2069 ip6_mrouter_get = NULL; 2070 ip6_mrouter_set = NULL; 2071 mrt6_ioctl = NULL; 2072 2073 MIF6_LOCK_DESTROY(); 2074 MFC6_LOCK_DESTROY(); 2075 MROUTER6_LOCK_DESTROY(); 2076 break; 2077 2078 default: 2079 return (EOPNOTSUPP); 2080 } 2081 2082 return (0); 2083} 2084 2085static moduledata_t ip6_mroutemod = { 2086 "ip6_mroute", 2087 ip6_mroute_modevent, 2088 0 2089}; 2090 2091DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2092