ip6_mroute.c revision 196019
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 196019 2009-08-01 19:26:27Z rwatson $"); 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/module.h> 95#include <sys/domain.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> 106 107#include <net/if.h> 108#include <net/if_types.h> 109#include <net/raw_cb.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/ip_encap.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 126static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 127 128/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 129#define M_HASCL(m) ((m)->m_flags & M_EXT) 130 131static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 132static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 133static void pim6_init(void); 134static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 135static int set_pim6(int *); 136static int socket_send(struct socket *, struct mbuf *, 137 struct sockaddr_in6 *); 138 139extern int in6_mcast_loop; 140extern struct domain inet6domain; 141 142static const struct encaptab *pim6_encap_cookie; 143static const struct ip6protosw in6_pim_protosw = { 144 .pr_type = SOCK_RAW, 145 .pr_domain = &inet6domain, 146 .pr_protocol = IPPROTO_PIM, 147 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 148 .pr_input = pim6_input, 149 .pr_output = rip6_output, 150 .pr_ctloutput = rip6_ctloutput, 151 .pr_init = pim6_init, 152 .pr_usrreqs = &rip6_usrreqs 153}; 154static int pim6_encapcheck(const struct mbuf *, int, int, void *); 155 156static VNET_DEFINE(int, ip6_mrouter_ver); 157#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 158 159SYSCTL_DECL(_net_inet6); 160SYSCTL_DECL(_net_inet6_ip6); 161SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 162 163static struct mrt6stat mrt6stat; 164SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 165 &mrt6stat, mrt6stat, 166 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 167 168#define NO_RTE_FOUND 0x1 169#define RTE_FOUND 0x2 170 171static struct mtx mrouter6_mtx; 172#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 173#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 174#define MROUTER6_LOCK_ASSERT() do { \ 175 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 176 NET_ASSERT_GIANT(); \ 177} while (0) 178#define MROUTER6_LOCK_INIT() \ 179 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 180#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 181 182static struct mf6c *mf6ctable[MF6CTBLSIZ]; 183SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 184 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 185 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 186 "netinet6/ip6_mroute.h)"); 187 188static struct mtx mfc6_mtx; 189#define MFC6_LOCK() mtx_lock(&mfc6_mtx) 190#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 191#define MFC6_LOCK_ASSERT() do { \ 192 mtx_assert(&mfc6_mtx, MA_OWNED); \ 193 NET_ASSERT_GIANT(); \ 194} while (0) 195#define MFC6_LOCK_INIT() \ 196 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 197#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 198 199static u_char n6expire[MF6CTBLSIZ]; 200 201static struct mif6 mif6table[MAXMIFS]; 202SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 203 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]", 204 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)"); 205 206static struct mtx mif6_mtx; 207#define MIF6_LOCK() mtx_lock(&mif6_mtx) 208#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 209#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 210#define MIF6_LOCK_INIT() \ 211 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 212#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 213 214#ifdef MRT6DEBUG 215static VNET_DEFINE(u_int, mrt6debug); /* debug level */ 216#define V_mrt6debug VNET(mrt6debug) 217#define DEBUG_MFC 0x02 218#define DEBUG_FORWARD 0x04 219#define DEBUG_EXPIRE 0x08 220#define DEBUG_XMIT 0x10 221#define DEBUG_REG 0x20 222#define DEBUG_PIM 0x40 223#endif 224 225static void expire_upcalls(void *); 226#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 227#define UPCALL_EXPIRE 6 /* number of timeouts */ 228 229/* 230 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 231 */ 232 233/* 234 * 'Interfaces' associated with decapsulator (so we can tell 235 * packets that went through it from ones that get reflected 236 * by a broken gateway). Different from IPv4 register_if, 237 * these interfaces are linked into the system ifnet list, 238 * because per-interface IPv6 statistics are maintained in 239 * ifp->if_afdata. But it does not have any routes point 240 * to them. I.e., packets can't be sent this way. They 241 * only exist as a placeholder for multicast source 242 * verification. 243 */ 244static struct ifnet *multicast_register_if6; 245 246#define ENCAP_HOPS 64 247 248/* 249 * Private variables. 250 */ 251static mifi_t nummifs = 0; 252static mifi_t reg_mif_num = (mifi_t)-1; 253 254static struct pim6stat pim6stat; 255SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 256 &pim6stat, pim6stat, 257 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 258 259static VNET_DEFINE(int, pim6); 260#define V_pim6 VNET(pim6) 261 262/* 263 * Hash function for a source, group entry 264 */ 265#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 266 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 267 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 268 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 269 270/* 271 * Find a route for a given origin IPv6 address and Multicast group address. 272 */ 273#define MF6CFIND(o, g, rt) do { \ 274 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 275 rt = NULL; \ 276 mrt6stat.mrt6s_mfc_lookups++; \ 277 while (_rt) { \ 278 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 279 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 280 (_rt->mf6c_stall == NULL)) { \ 281 rt = _rt; \ 282 break; \ 283 } \ 284 _rt = _rt->mf6c_next; \ 285 } \ 286 if (rt == NULL) { \ 287 mrt6stat.mrt6s_mfc_misses++; \ 288 } \ 289} while (/*CONSTCOND*/ 0) 290 291/* 292 * Macros to compute elapsed time efficiently 293 * Borrowed from Van Jacobson's scheduling code 294 * XXX: replace with timersub() ? 295 */ 296#define TV_DELTA(a, b, delta) do { \ 297 int xxs; \ 298 \ 299 delta = (a).tv_usec - (b).tv_usec; \ 300 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 301 switch (xxs) { \ 302 case 2: \ 303 delta += 1000000; \ 304 /* FALLTHROUGH */ \ 305 case 1: \ 306 delta += 1000000; \ 307 break; \ 308 default: \ 309 delta += (1000000 * xxs); \ 310 } \ 311 } \ 312} while (/*CONSTCOND*/ 0) 313 314/* XXX: replace with timercmp(a, b, <) ? */ 315#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 316 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 317 318#ifdef UPCALL_TIMING 319#define UPCALL_MAX 50 320static u_long upcall_data[UPCALL_MAX + 1]; 321static void collate(); 322#endif /* UPCALL_TIMING */ 323 324static int ip6_mrouter_init(struct socket *, int, int); 325static int add_m6fc(struct mf6cctl *); 326static int add_m6if(struct mif6ctl *); 327static int del_m6fc(struct mf6cctl *); 328static int del_m6if(mifi_t *); 329static int del_m6if_locked(mifi_t *); 330static int get_mif6_cnt(struct sioc_mif_req6 *); 331static int get_sg_cnt(struct sioc_sg_req6 *); 332 333static struct callout expire_upcalls_ch; 334 335int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 336int X_ip6_mrouter_done(void); 337int X_ip6_mrouter_set(struct socket *, struct sockopt *); 338int X_ip6_mrouter_get(struct socket *, struct sockopt *); 339int X_mrt6_ioctl(u_long, caddr_t); 340 341static void 342pim6_init(void) 343{ 344 345#ifdef MRT6DEBUG 346 V_mrt6debug = 0; /* debug level */ 347#endif 348} 349 350/* 351 * Handle MRT setsockopt commands to modify the multicast routing tables. 352 */ 353int 354X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 355{ 356 int error = 0; 357 int optval; 358 struct mif6ctl mifc; 359 struct mf6cctl mfcc; 360 mifi_t mifi; 361 362 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 363 return (EACCES); 364 365 switch (sopt->sopt_name) { 366 case MRT6_INIT: 367#ifdef MRT6_OINIT 368 case MRT6_OINIT: 369#endif 370 error = sooptcopyin(sopt, &optval, sizeof(optval), 371 sizeof(optval)); 372 if (error) 373 break; 374 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 375 break; 376 case MRT6_DONE: 377 error = X_ip6_mrouter_done(); 378 break; 379 case MRT6_ADD_MIF: 380 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 381 if (error) 382 break; 383 error = add_m6if(&mifc); 384 break; 385 case MRT6_ADD_MFC: 386 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 387 if (error) 388 break; 389 error = add_m6fc(&mfcc); 390 break; 391 case MRT6_DEL_MFC: 392 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 393 if (error) 394 break; 395 error = del_m6fc(&mfcc); 396 break; 397 case MRT6_DEL_MIF: 398 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 399 if (error) 400 break; 401 error = del_m6if(&mifi); 402 break; 403 case MRT6_PIM: 404 error = sooptcopyin(sopt, &optval, sizeof(optval), 405 sizeof(optval)); 406 if (error) 407 break; 408 error = set_pim6(&optval); 409 break; 410 default: 411 error = EOPNOTSUPP; 412 break; 413 } 414 415 return (error); 416} 417 418/* 419 * Handle MRT getsockopt commands 420 */ 421int 422X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 423{ 424 int error = 0; 425 426 if (so != V_ip6_mrouter) 427 return (EACCES); 428 429 switch (sopt->sopt_name) { 430 case MRT6_PIM: 431 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 432 break; 433 } 434 return (error); 435} 436 437/* 438 * Handle ioctl commands to obtain information from the cache 439 */ 440int 441X_mrt6_ioctl(u_long cmd, caddr_t data) 442{ 443 int ret; 444 445 ret = EINVAL; 446 447 switch (cmd) { 448 case SIOCGETSGCNT_IN6: 449 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 450 break; 451 452 case SIOCGETMIFCNT_IN6: 453 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 454 break; 455 456 default: 457 break; 458 } 459 460 return (ret); 461} 462 463/* 464 * returns the packet, byte, rpf-failure count for the source group provided 465 */ 466static int 467get_sg_cnt(struct sioc_sg_req6 *req) 468{ 469 struct mf6c *rt; 470 int ret; 471 472 ret = 0; 473 474 MFC6_LOCK(); 475 476 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 477 if (rt == NULL) { 478 ret = ESRCH; 479 } else { 480 req->pktcnt = rt->mf6c_pkt_cnt; 481 req->bytecnt = rt->mf6c_byte_cnt; 482 req->wrong_if = rt->mf6c_wrong_if; 483 } 484 485 MFC6_UNLOCK(); 486 487 return (ret); 488} 489 490/* 491 * returns the input and output packet and byte counts on the mif provided 492 */ 493static int 494get_mif6_cnt(struct sioc_mif_req6 *req) 495{ 496 mifi_t mifi; 497 int ret; 498 499 ret = 0; 500 mifi = req->mifi; 501 502 MIF6_LOCK(); 503 504 if (mifi >= nummifs) { 505 ret = EINVAL; 506 } else { 507 req->icount = mif6table[mifi].m6_pkt_in; 508 req->ocount = mif6table[mifi].m6_pkt_out; 509 req->ibytes = mif6table[mifi].m6_bytes_in; 510 req->obytes = mif6table[mifi].m6_bytes_out; 511 } 512 513 MIF6_UNLOCK(); 514 515 return (ret); 516} 517 518static int 519set_pim6(int *i) 520{ 521 if ((*i != 1) && (*i != 0)) 522 return (EINVAL); 523 524 V_pim6 = *i; 525 526 return (0); 527} 528 529/* 530 * Enable multicast routing 531 */ 532static int 533ip6_mrouter_init(struct socket *so, int v, int cmd) 534{ 535 536 V_ip6_mrouter_ver = 0; 537 538#ifdef MRT6DEBUG 539 V_mrt6debug = 0; 540 541 if (V_mrt6debug) 542 log(LOG_DEBUG, 543 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 544 so->so_type, so->so_proto->pr_protocol); 545#endif 546 547 if (so->so_type != SOCK_RAW || 548 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 549 return (EOPNOTSUPP); 550 551 if (v != 1) 552 return (ENOPROTOOPT); 553 554 MROUTER6_LOCK(); 555 556 if (V_ip6_mrouter != NULL) { 557 MROUTER6_UNLOCK(); 558 return (EADDRINUSE); 559 } 560 561 V_ip6_mrouter = so; 562 V_ip6_mrouter_ver = cmd; 563 564 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 565 bzero((caddr_t)n6expire, sizeof(n6expire)); 566 567 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 568 569 callout_init(&expire_upcalls_ch, 0); 570 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 571 expire_upcalls, NULL); 572 573 MROUTER6_UNLOCK(); 574 575#ifdef MRT6DEBUG 576 if (V_mrt6debug) 577 log(LOG_DEBUG, "ip6_mrouter_init\n"); 578#endif 579 580 return (0); 581} 582 583/* 584 * Disable IPv6 multicast forwarding. 585 */ 586int 587X_ip6_mrouter_done(void) 588{ 589 mifi_t mifi; 590 int i; 591 struct mf6c *rt; 592 struct rtdetq *rte; 593 594 MROUTER6_LOCK(); 595 596 if (V_ip6_mrouter == NULL) { 597 MROUTER6_UNLOCK(); 598 return (EINVAL); 599 } 600 601 /* 602 * For each phyint in use, disable promiscuous reception of all IPv6 603 * multicasts. 604 */ 605 for (mifi = 0; mifi < nummifs; mifi++) { 606 if (mif6table[mifi].m6_ifp && 607 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 608 if_allmulti(mif6table[mifi].m6_ifp, 0); 609 } 610 } 611 bzero((caddr_t)mif6table, sizeof(mif6table)); 612 nummifs = 0; 613 614 V_pim6 = 0; /* used to stub out/in pim specific code */ 615 616 callout_stop(&expire_upcalls_ch); 617 618 /* 619 * Free all multicast forwarding cache entries. 620 */ 621 MFC6_LOCK(); 622 for (i = 0; i < MF6CTBLSIZ; i++) { 623 rt = mf6ctable[i]; 624 while (rt) { 625 struct mf6c *frt; 626 627 for (rte = rt->mf6c_stall; rte != NULL; ) { 628 struct rtdetq *n = rte->next; 629 630 m_free(rte->m); 631 free(rte, M_MRTABLE6); 632 rte = n; 633 } 634 frt = rt; 635 rt = rt->mf6c_next; 636 free(frt, M_MRTABLE6); 637 } 638 } 639 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 640 MFC6_UNLOCK(); 641 642 /* 643 * Reset register interface 644 */ 645 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 646 if_detach(multicast_register_if6); 647 if_free(multicast_register_if6); 648 reg_mif_num = (mifi_t)-1; 649 multicast_register_if6 = NULL; 650 } 651 652 V_ip6_mrouter = NULL; 653 V_ip6_mrouter_ver = 0; 654 655 MROUTER6_UNLOCK(); 656 657#ifdef MRT6DEBUG 658 if (V_mrt6debug) 659 log(LOG_DEBUG, "ip6_mrouter_done\n"); 660#endif 661 662 return (0); 663} 664 665static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 666 667/* 668 * Add a mif to the mif table 669 */ 670static int 671add_m6if(struct mif6ctl *mifcp) 672{ 673 struct mif6 *mifp; 674 struct ifnet *ifp; 675 int error; 676 677 MIF6_LOCK(); 678 679 if (mifcp->mif6c_mifi >= MAXMIFS) { 680 MIF6_UNLOCK(); 681 return (EINVAL); 682 } 683 mifp = mif6table + mifcp->mif6c_mifi; 684 if (mifp->m6_ifp != NULL) { 685 MIF6_UNLOCK(); 686 return (EADDRINUSE); /* XXX: is it appropriate? */ 687 } 688 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 689 MIF6_UNLOCK(); 690 return (ENXIO); 691 } 692 693 ifp = ifnet_byindex(mifcp->mif6c_pifi); 694 695 if (mifcp->mif6c_flags & MIFF_REGISTER) { 696 if (reg_mif_num == (mifi_t)-1) { 697 ifp = if_alloc(IFT_OTHER); 698 699 if_initname(ifp, "register_mif", 0); 700 ifp->if_flags |= IFF_LOOPBACK; 701 if_attach(ifp); 702 multicast_register_if6 = ifp; 703 reg_mif_num = mifcp->mif6c_mifi; 704 /* 705 * it is impossible to guess the ifindex of the 706 * register interface. So mif6c_pifi is automatically 707 * calculated. 708 */ 709 mifcp->mif6c_pifi = ifp->if_index; 710 } else { 711 ifp = multicast_register_if6; 712 } 713 } else { 714 /* Make sure the interface supports multicast */ 715 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 716 MIF6_UNLOCK(); 717 return (EOPNOTSUPP); 718 } 719 720 error = if_allmulti(ifp, 1); 721 if (error) { 722 MIF6_UNLOCK(); 723 return (error); 724 } 725 } 726 727 mifp->m6_flags = mifcp->mif6c_flags; 728 mifp->m6_ifp = ifp; 729 730 /* initialize per mif pkt counters */ 731 mifp->m6_pkt_in = 0; 732 mifp->m6_pkt_out = 0; 733 mifp->m6_bytes_in = 0; 734 mifp->m6_bytes_out = 0; 735 bzero(&mifp->m6_route, sizeof(mifp->m6_route)); 736 737 /* Adjust nummifs up if the mifi is higher than nummifs */ 738 if (nummifs <= mifcp->mif6c_mifi) 739 nummifs = mifcp->mif6c_mifi + 1; 740 741 MIF6_UNLOCK(); 742 743#ifdef MRT6DEBUG 744 if (V_mrt6debug) 745 log(LOG_DEBUG, 746 "add_mif #%d, phyint %s\n", 747 mifcp->mif6c_mifi, 748 ifp->if_xname); 749#endif 750 751 return (0); 752} 753 754/* 755 * Delete a mif from the mif table 756 */ 757static int 758del_m6if_locked(mifi_t *mifip) 759{ 760 struct mif6 *mifp = mif6table + *mifip; 761 mifi_t mifi; 762 struct ifnet *ifp; 763 764 MIF6_LOCK_ASSERT(); 765 766 if (*mifip >= nummifs) 767 return (EINVAL); 768 if (mifp->m6_ifp == NULL) 769 return (EINVAL); 770 771 if (!(mifp->m6_flags & MIFF_REGISTER)) { 772 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 773 ifp = mifp->m6_ifp; 774 if_allmulti(ifp, 0); 775 } else { 776 if (reg_mif_num != (mifi_t)-1 && 777 multicast_register_if6 != NULL) { 778 if_detach(multicast_register_if6); 779 if_free(multicast_register_if6); 780 reg_mif_num = (mifi_t)-1; 781 multicast_register_if6 = NULL; 782 } 783 } 784 785 bzero((caddr_t)mifp, sizeof(*mifp)); 786 787 /* Adjust nummifs down */ 788 for (mifi = nummifs; mifi > 0; mifi--) 789 if (mif6table[mifi - 1].m6_ifp) 790 break; 791 nummifs = mifi; 792 793#ifdef MRT6DEBUG 794 if (V_mrt6debug) 795 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 796#endif 797 798 return (0); 799} 800 801static int 802del_m6if(mifi_t *mifip) 803{ 804 int cc; 805 806 MIF6_LOCK(); 807 cc = del_m6if_locked(mifip); 808 MIF6_UNLOCK(); 809 810 return (cc); 811} 812 813/* 814 * Add an mfc entry 815 */ 816static int 817add_m6fc(struct mf6cctl *mfccp) 818{ 819 struct mf6c *rt; 820 u_long hash; 821 struct rtdetq *rte; 822 u_short nstl; 823 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 824 825 MFC6_LOCK(); 826 827 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 828 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 829 830 /* If an entry already exists, just update the fields */ 831 if (rt) { 832#ifdef MRT6DEBUG 833 if (V_mrt6debug & DEBUG_MFC) { 834 log(LOG_DEBUG, 835 "add_m6fc no upcall h %d o %s g %s p %x\n", 836 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 837 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 838 mfccp->mf6cc_parent); 839 } 840#endif 841 842 rt->mf6c_parent = mfccp->mf6cc_parent; 843 rt->mf6c_ifset = mfccp->mf6cc_ifset; 844 845 MFC6_UNLOCK(); 846 return (0); 847 } 848 849 /* 850 * Find the entry for which the upcall was made and update 851 */ 852 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 853 mfccp->mf6cc_mcastgrp.sin6_addr); 854 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 855 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 856 &mfccp->mf6cc_origin.sin6_addr) && 857 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 858 &mfccp->mf6cc_mcastgrp.sin6_addr) && 859 (rt->mf6c_stall != NULL)) { 860 861 if (nstl++) 862 log(LOG_ERR, 863 "add_m6fc: %s o %s g %s p %x dbx %p\n", 864 "multiple kernel entries", 865 ip6_sprintf(ip6bufo, 866 &mfccp->mf6cc_origin.sin6_addr), 867 ip6_sprintf(ip6bufg, 868 &mfccp->mf6cc_mcastgrp.sin6_addr), 869 mfccp->mf6cc_parent, rt->mf6c_stall); 870 871#ifdef MRT6DEBUG 872 if (V_mrt6debug & DEBUG_MFC) 873 log(LOG_DEBUG, 874 "add_m6fc o %s g %s p %x dbg %x\n", 875 ip6_sprintf(ip6bufo, 876 &mfccp->mf6cc_origin.sin6_addr), 877 ip6_sprintf(ip6bufg, 878 &mfccp->mf6cc_mcastgrp.sin6_addr), 879 mfccp->mf6cc_parent, rt->mf6c_stall); 880#endif 881 882 rt->mf6c_origin = mfccp->mf6cc_origin; 883 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 884 rt->mf6c_parent = mfccp->mf6cc_parent; 885 rt->mf6c_ifset = mfccp->mf6cc_ifset; 886 /* initialize pkt counters per src-grp */ 887 rt->mf6c_pkt_cnt = 0; 888 rt->mf6c_byte_cnt = 0; 889 rt->mf6c_wrong_if = 0; 890 891 rt->mf6c_expire = 0; /* Don't clean this guy up */ 892 n6expire[hash]--; 893 894 /* free packets Qed at the end of this entry */ 895 for (rte = rt->mf6c_stall; rte != NULL; ) { 896 struct rtdetq *n = rte->next; 897 ip6_mdq(rte->m, rte->ifp, rt); 898 m_freem(rte->m); 899#ifdef UPCALL_TIMING 900 collate(&(rte->t)); 901#endif /* UPCALL_TIMING */ 902 free(rte, M_MRTABLE6); 903 rte = n; 904 } 905 rt->mf6c_stall = NULL; 906 } 907 } 908 909 /* 910 * It is possible that an entry is being inserted without an upcall 911 */ 912 if (nstl == 0) { 913#ifdef MRT6DEBUG 914 if (V_mrt6debug & DEBUG_MFC) 915 log(LOG_DEBUG, 916 "add_mfc no upcall h %d o %s g %s p %x\n", 917 hash, 918 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 919 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 920 mfccp->mf6cc_parent); 921#endif 922 923 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 924 925 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 926 &mfccp->mf6cc_origin.sin6_addr)&& 927 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 928 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 929 930 rt->mf6c_origin = mfccp->mf6cc_origin; 931 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 932 rt->mf6c_parent = mfccp->mf6cc_parent; 933 rt->mf6c_ifset = mfccp->mf6cc_ifset; 934 /* initialize pkt counters per src-grp */ 935 rt->mf6c_pkt_cnt = 0; 936 rt->mf6c_byte_cnt = 0; 937 rt->mf6c_wrong_if = 0; 938 939 if (rt->mf6c_expire) 940 n6expire[hash]--; 941 rt->mf6c_expire = 0; 942 } 943 } 944 if (rt == NULL) { 945 /* no upcall, so make a new entry */ 946 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 947 M_NOWAIT); 948 if (rt == NULL) { 949 MFC6_UNLOCK(); 950 return (ENOBUFS); 951 } 952 953 /* insert new entry at head of hash chain */ 954 rt->mf6c_origin = mfccp->mf6cc_origin; 955 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 956 rt->mf6c_parent = mfccp->mf6cc_parent; 957 rt->mf6c_ifset = mfccp->mf6cc_ifset; 958 /* initialize pkt counters per src-grp */ 959 rt->mf6c_pkt_cnt = 0; 960 rt->mf6c_byte_cnt = 0; 961 rt->mf6c_wrong_if = 0; 962 rt->mf6c_expire = 0; 963 rt->mf6c_stall = NULL; 964 965 /* link into table */ 966 rt->mf6c_next = mf6ctable[hash]; 967 mf6ctable[hash] = rt; 968 } 969 } 970 971 MFC6_UNLOCK(); 972 return (0); 973} 974 975#ifdef UPCALL_TIMING 976/* 977 * collect delay statistics on the upcalls 978 */ 979static void 980collate(struct timeval *t) 981{ 982 u_long d; 983 struct timeval tp; 984 u_long delta; 985 986 GET_TIME(tp); 987 988 if (TV_LT(*t, tp)) 989 { 990 TV_DELTA(tp, *t, delta); 991 992 d = delta >> 10; 993 if (d > UPCALL_MAX) 994 d = UPCALL_MAX; 995 996 ++upcall_data[d]; 997 } 998} 999#endif /* UPCALL_TIMING */ 1000 1001/* 1002 * Delete an mfc entry 1003 */ 1004static int 1005del_m6fc(struct mf6cctl *mfccp) 1006{ 1007 struct sockaddr_in6 origin; 1008 struct sockaddr_in6 mcastgrp; 1009 struct mf6c *rt; 1010 struct mf6c **nptr; 1011 u_long hash; 1012 1013 origin = mfccp->mf6cc_origin; 1014 mcastgrp = mfccp->mf6cc_mcastgrp; 1015 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1016 1017#ifdef MRT6DEBUG 1018 if (V_mrt6debug & DEBUG_MFC) { 1019 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1020 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 1021 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1022 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1023 } 1024#endif 1025 1026 MFC6_LOCK(); 1027 1028 nptr = &mf6ctable[hash]; 1029 while ((rt = *nptr) != NULL) { 1030 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1031 &rt->mf6c_origin.sin6_addr) && 1032 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1033 &rt->mf6c_mcastgrp.sin6_addr) && 1034 rt->mf6c_stall == NULL) 1035 break; 1036 1037 nptr = &rt->mf6c_next; 1038 } 1039 if (rt == NULL) { 1040 MFC6_UNLOCK(); 1041 return (EADDRNOTAVAIL); 1042 } 1043 1044 *nptr = rt->mf6c_next; 1045 free(rt, M_MRTABLE6); 1046 1047 MFC6_UNLOCK(); 1048 1049 return (0); 1050} 1051 1052static int 1053socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1054{ 1055 1056 if (s) { 1057 if (sbappendaddr(&s->so_rcv, 1058 (struct sockaddr *)src, 1059 mm, (struct mbuf *)0) != 0) { 1060 sorwakeup(s); 1061 return (0); 1062 } 1063 } 1064 m_freem(mm); 1065 return (-1); 1066} 1067 1068/* 1069 * IPv6 multicast forwarding function. This function assumes that the packet 1070 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1071 * pointed to by "ifp", and the packet is to be relayed to other networks 1072 * that have members of the packet's destination IPv6 multicast group. 1073 * 1074 * The packet is returned unscathed to the caller, unless it is 1075 * erroneous, in which case a non-zero return value tells the caller to 1076 * discard it. 1077 * 1078 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1079 * this function is called in the originating context (i.e., not when 1080 * forwarding a packet from other node). ip6_output(), which is currently the 1081 * only function that calls this function is called in the originating context, 1082 * explicitly ensures this condition. It is caller's responsibility to ensure 1083 * that if this function is called from somewhere else in the originating 1084 * context in the future. 1085 */ 1086int 1087X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1088{ 1089 struct mf6c *rt; 1090 struct mif6 *mifp; 1091 struct mbuf *mm; 1092 mifi_t mifi; 1093 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1094 1095#ifdef MRT6DEBUG 1096 if (V_mrt6debug & DEBUG_FORWARD) 1097 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1098 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1099 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1100 ifp->if_index); 1101#endif 1102 1103 /* 1104 * Don't forward a packet with Hop limit of zero or one, 1105 * or a packet destined to a local-only group. 1106 */ 1107 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1108 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1109 return (0); 1110 ip6->ip6_hlim--; 1111 1112 /* 1113 * Source address check: do not forward packets with unspecified 1114 * source. It was discussed in July 2000, on ipngwg mailing list. 1115 * This is rather more serious than unicast cases, because some 1116 * MLD packets can be sent with the unspecified source address 1117 * (although such packets must normally set 1 to the hop limit field). 1118 */ 1119 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1120 V_ip6stat.ip6s_cantforward++; 1121 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1122 V_ip6_log_time = time_second; 1123 log(LOG_DEBUG, 1124 "cannot forward " 1125 "from %s to %s nxt %d received on %s\n", 1126 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1127 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1128 ip6->ip6_nxt, 1129 if_name(m->m_pkthdr.rcvif)); 1130 } 1131 return (0); 1132 } 1133 1134 MFC6_LOCK(); 1135 1136 /* 1137 * Determine forwarding mifs from the forwarding cache table 1138 */ 1139 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1140 1141 /* Entry exists, so forward if necessary */ 1142 if (rt) { 1143 MFC6_UNLOCK(); 1144 return (ip6_mdq(m, ifp, rt)); 1145 } else { 1146 /* 1147 * If we don't have a route for packet's origin, 1148 * Make a copy of the packet & 1149 * send message to routing daemon 1150 */ 1151 1152 struct mbuf *mb0; 1153 struct rtdetq *rte; 1154 u_long hash; 1155/* int i, npkts;*/ 1156#ifdef UPCALL_TIMING 1157 struct timeval tp; 1158 1159 GET_TIME(tp); 1160#endif /* UPCALL_TIMING */ 1161 1162 mrt6stat.mrt6s_no_route++; 1163#ifdef MRT6DEBUG 1164 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1165 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1166 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1167 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1168#endif 1169 1170 /* 1171 * Allocate mbufs early so that we don't do extra work if we 1172 * are just going to fail anyway. 1173 */ 1174 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1175 M_NOWAIT); 1176 if (rte == NULL) { 1177 MFC6_UNLOCK(); 1178 return (ENOBUFS); 1179 } 1180 mb0 = m_copy(m, 0, M_COPYALL); 1181 /* 1182 * Pullup packet header if needed before storing it, 1183 * as other references may modify it in the meantime. 1184 */ 1185 if (mb0 && 1186 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1187 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1188 if (mb0 == NULL) { 1189 free(rte, M_MRTABLE6); 1190 MFC6_UNLOCK(); 1191 return (ENOBUFS); 1192 } 1193 1194 /* is there an upcall waiting for this packet? */ 1195 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1196 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1197 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1198 &rt->mf6c_origin.sin6_addr) && 1199 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1200 &rt->mf6c_mcastgrp.sin6_addr) && 1201 (rt->mf6c_stall != NULL)) 1202 break; 1203 } 1204 1205 if (rt == NULL) { 1206 struct mrt6msg *im; 1207#ifdef MRT6_OINIT 1208 struct omrt6msg *oim; 1209#endif 1210 1211 /* no upcall, so make a new entry */ 1212 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1213 M_NOWAIT); 1214 if (rt == NULL) { 1215 free(rte, M_MRTABLE6); 1216 m_freem(mb0); 1217 MFC6_UNLOCK(); 1218 return (ENOBUFS); 1219 } 1220 /* 1221 * Make a copy of the header to send to the user 1222 * level process 1223 */ 1224 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1225 1226 if (mm == NULL) { 1227 free(rte, M_MRTABLE6); 1228 m_freem(mb0); 1229 free(rt, M_MRTABLE6); 1230 MFC6_UNLOCK(); 1231 return (ENOBUFS); 1232 } 1233 1234 /* 1235 * Send message to routing daemon 1236 */ 1237 sin6.sin6_addr = ip6->ip6_src; 1238 1239 im = NULL; 1240#ifdef MRT6_OINIT 1241 oim = NULL; 1242#endif 1243 switch (V_ip6_mrouter_ver) { 1244#ifdef MRT6_OINIT 1245 case MRT6_OINIT: 1246 oim = mtod(mm, struct omrt6msg *); 1247 oim->im6_msgtype = MRT6MSG_NOCACHE; 1248 oim->im6_mbz = 0; 1249 break; 1250#endif 1251 case MRT6_INIT: 1252 im = mtod(mm, struct mrt6msg *); 1253 im->im6_msgtype = MRT6MSG_NOCACHE; 1254 im->im6_mbz = 0; 1255 break; 1256 default: 1257 free(rte, M_MRTABLE6); 1258 m_freem(mb0); 1259 free(rt, M_MRTABLE6); 1260 MFC6_UNLOCK(); 1261 return (EINVAL); 1262 } 1263 1264#ifdef MRT6DEBUG 1265 if (V_mrt6debug & DEBUG_FORWARD) 1266 log(LOG_DEBUG, 1267 "getting the iif info in the kernel\n"); 1268#endif 1269 1270 for (mifp = mif6table, mifi = 0; 1271 mifi < nummifs && mifp->m6_ifp != ifp; 1272 mifp++, mifi++) 1273 ; 1274 1275 switch (V_ip6_mrouter_ver) { 1276#ifdef MRT6_OINIT 1277 case MRT6_OINIT: 1278 oim->im6_mif = mifi; 1279 break; 1280#endif 1281 case MRT6_INIT: 1282 im->im6_mif = mifi; 1283 break; 1284 } 1285 1286 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1287 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1288 "socket queue full\n"); 1289 mrt6stat.mrt6s_upq_sockfull++; 1290 free(rte, M_MRTABLE6); 1291 m_freem(mb0); 1292 free(rt, M_MRTABLE6); 1293 MFC6_UNLOCK(); 1294 return (ENOBUFS); 1295 } 1296 1297 mrt6stat.mrt6s_upcalls++; 1298 1299 /* insert new entry at head of hash chain */ 1300 bzero(rt, sizeof(*rt)); 1301 rt->mf6c_origin.sin6_family = AF_INET6; 1302 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1303 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1304 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1305 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1306 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1307 rt->mf6c_expire = UPCALL_EXPIRE; 1308 n6expire[hash]++; 1309 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1310 1311 /* link into table */ 1312 rt->mf6c_next = mf6ctable[hash]; 1313 mf6ctable[hash] = rt; 1314 /* Add this entry to the end of the queue */ 1315 rt->mf6c_stall = rte; 1316 } else { 1317 /* determine if q has overflowed */ 1318 struct rtdetq **p; 1319 int npkts = 0; 1320 1321 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1322 if (++npkts > MAX_UPQ6) { 1323 mrt6stat.mrt6s_upq_ovflw++; 1324 free(rte, M_MRTABLE6); 1325 m_freem(mb0); 1326 MFC6_UNLOCK(); 1327 return (0); 1328 } 1329 1330 /* Add this entry to the end of the queue */ 1331 *p = rte; 1332 } 1333 1334 rte->next = NULL; 1335 rte->m = mb0; 1336 rte->ifp = ifp; 1337#ifdef UPCALL_TIMING 1338 rte->t = tp; 1339#endif /* UPCALL_TIMING */ 1340 1341 MFC6_UNLOCK(); 1342 1343 return (0); 1344 } 1345} 1346 1347/* 1348 * Clean up cache entries if upcalls are not serviced 1349 * Call from the Slow Timeout mechanism, every half second. 1350 */ 1351static void 1352expire_upcalls(void *unused) 1353{ 1354 struct rtdetq *rte; 1355 struct mf6c *mfc, **nptr; 1356 int i; 1357 1358 MFC6_LOCK(); 1359 for (i = 0; i < MF6CTBLSIZ; i++) { 1360 if (n6expire[i] == 0) 1361 continue; 1362 nptr = &mf6ctable[i]; 1363 while ((mfc = *nptr) != NULL) { 1364 rte = mfc->mf6c_stall; 1365 /* 1366 * Skip real cache entries 1367 * Make sure it wasn't marked to not expire (shouldn't happen) 1368 * If it expires now 1369 */ 1370 if (rte != NULL && 1371 mfc->mf6c_expire != 0 && 1372 --mfc->mf6c_expire == 0) { 1373#ifdef MRT6DEBUG 1374 if (V_mrt6debug & DEBUG_EXPIRE) { 1375 char ip6bufo[INET6_ADDRSTRLEN]; 1376 char ip6bufg[INET6_ADDRSTRLEN]; 1377 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1378 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1379 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1380 } 1381#endif 1382 /* 1383 * drop all the packets 1384 * free the mbuf with the pkt, if, timing info 1385 */ 1386 do { 1387 struct rtdetq *n = rte->next; 1388 m_freem(rte->m); 1389 free(rte, M_MRTABLE6); 1390 rte = n; 1391 } while (rte != NULL); 1392 mrt6stat.mrt6s_cache_cleanups++; 1393 n6expire[i]--; 1394 1395 *nptr = mfc->mf6c_next; 1396 free(mfc, M_MRTABLE6); 1397 } else { 1398 nptr = &mfc->mf6c_next; 1399 } 1400 } 1401 } 1402 MFC6_UNLOCK(); 1403 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1404 expire_upcalls, NULL); 1405} 1406 1407/* 1408 * Packet forwarding routine once entry in the cache is made 1409 */ 1410static int 1411ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1412{ 1413 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1414 mifi_t mifi, iif; 1415 struct mif6 *mifp; 1416 int plen = m->m_pkthdr.len; 1417 struct in6_addr src0, dst0; /* copies for local work */ 1418 u_int32_t iszone, idzone, oszone, odzone; 1419 int error = 0; 1420 1421/* 1422 * Macro to send packet on mif. Since RSVP packets don't get counted on 1423 * input, they shouldn't get counted on output, so statistics keeping is 1424 * separate. 1425 */ 1426 1427#define MC6_SEND(ip6, mifp, m) do { \ 1428 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1429 register_send((ip6), (mifp), (m)); \ 1430 else \ 1431 phyint_send((ip6), (mifp), (m)); \ 1432} while (/*CONSTCOND*/ 0) 1433 1434 /* 1435 * Don't forward if it didn't arrive from the parent mif 1436 * for its origin. 1437 */ 1438 mifi = rt->mf6c_parent; 1439 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1440 /* came in the wrong interface */ 1441#ifdef MRT6DEBUG 1442 if (V_mrt6debug & DEBUG_FORWARD) 1443 log(LOG_DEBUG, 1444 "wrong if: ifid %d mifi %d mififid %x\n", 1445 ifp->if_index, mifi, 1446 mif6table[mifi].m6_ifp->if_index); 1447#endif 1448 mrt6stat.mrt6s_wrong_if++; 1449 rt->mf6c_wrong_if++; 1450 /* 1451 * If we are doing PIM processing, and we are forwarding 1452 * packets on this interface, send a message to the 1453 * routing daemon. 1454 */ 1455 /* have to make sure this is a valid mif */ 1456 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1457 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1458 /* 1459 * Check the M_LOOP flag to avoid an 1460 * unnecessary PIM assert. 1461 * XXX: M_LOOP is an ad-hoc hack... 1462 */ 1463 static struct sockaddr_in6 sin6 = 1464 { sizeof(sin6), AF_INET6 }; 1465 1466 struct mbuf *mm; 1467 struct mrt6msg *im; 1468#ifdef MRT6_OINIT 1469 struct omrt6msg *oim; 1470#endif 1471 1472 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1473 if (mm && 1474 (M_HASCL(mm) || 1475 mm->m_len < sizeof(struct ip6_hdr))) 1476 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1477 if (mm == NULL) 1478 return (ENOBUFS); 1479 1480#ifdef MRT6_OINIT 1481 oim = NULL; 1482#endif 1483 im = NULL; 1484 switch (V_ip6_mrouter_ver) { 1485#ifdef MRT6_OINIT 1486 case MRT6_OINIT: 1487 oim = mtod(mm, struct omrt6msg *); 1488 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1489 oim->im6_mbz = 0; 1490 break; 1491#endif 1492 case MRT6_INIT: 1493 im = mtod(mm, struct mrt6msg *); 1494 im->im6_msgtype = MRT6MSG_WRONGMIF; 1495 im->im6_mbz = 0; 1496 break; 1497 default: 1498 m_freem(mm); 1499 return (EINVAL); 1500 } 1501 1502 for (mifp = mif6table, iif = 0; 1503 iif < nummifs && mifp && 1504 mifp->m6_ifp != ifp; 1505 mifp++, iif++) 1506 ; 1507 1508 switch (V_ip6_mrouter_ver) { 1509#ifdef MRT6_OINIT 1510 case MRT6_OINIT: 1511 oim->im6_mif = iif; 1512 sin6.sin6_addr = oim->im6_src; 1513 break; 1514#endif 1515 case MRT6_INIT: 1516 im->im6_mif = iif; 1517 sin6.sin6_addr = im->im6_src; 1518 break; 1519 } 1520 1521 mrt6stat.mrt6s_upcalls++; 1522 1523 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1524#ifdef MRT6DEBUG 1525 if (V_mrt6debug) 1526 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1527#endif 1528 ++mrt6stat.mrt6s_upq_sockfull; 1529 return (ENOBUFS); 1530 } /* if socket Q full */ 1531 } /* if PIM */ 1532 return (0); 1533 } /* if wrong iif */ 1534 1535 /* If I sourced this packet, it counts as output, else it was input. */ 1536 if (m->m_pkthdr.rcvif == NULL) { 1537 /* XXX: is rcvif really NULL when output?? */ 1538 mif6table[mifi].m6_pkt_out++; 1539 mif6table[mifi].m6_bytes_out += plen; 1540 } else { 1541 mif6table[mifi].m6_pkt_in++; 1542 mif6table[mifi].m6_bytes_in += plen; 1543 } 1544 rt->mf6c_pkt_cnt++; 1545 rt->mf6c_byte_cnt += plen; 1546 1547 /* 1548 * For each mif, forward a copy of the packet if there are group 1549 * members downstream on the interface. 1550 */ 1551 src0 = ip6->ip6_src; 1552 dst0 = ip6->ip6_dst; 1553 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1554 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1555 V_ip6stat.ip6s_badscope++; 1556 return (error); 1557 } 1558 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1559 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1560 /* 1561 * check if the outgoing packet is going to break 1562 * a scope boundary. 1563 * XXX For packets through PIM register tunnel 1564 * interface, we believe a routing daemon. 1565 */ 1566 if (!(mif6table[rt->mf6c_parent].m6_flags & 1567 MIFF_REGISTER) && 1568 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1569 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1570 &oszone) || 1571 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1572 &odzone) || 1573 iszone != oszone || 1574 idzone != odzone) { 1575 V_ip6stat.ip6s_badscope++; 1576 continue; 1577 } 1578 } 1579 1580 mifp->m6_pkt_out++; 1581 mifp->m6_bytes_out += plen; 1582 MC6_SEND(ip6, mifp, m); 1583 } 1584 } 1585 return (0); 1586} 1587 1588static void 1589phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1590{ 1591 struct mbuf *mb_copy; 1592 struct ifnet *ifp = mifp->m6_ifp; 1593 int error = 0; 1594 struct sockaddr_in6 *dst6; 1595 u_long linkmtu; 1596 1597 dst6 = &mifp->m6_route.ro_dst; 1598 1599 /* 1600 * Make a new reference to the packet; make sure that 1601 * the IPv6 header is actually copied, not just referenced, 1602 * so that ip6_output() only scribbles on the copy. 1603 */ 1604 mb_copy = m_copy(m, 0, M_COPYALL); 1605 if (mb_copy && 1606 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1607 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1608 if (mb_copy == NULL) { 1609 return; 1610 } 1611 /* set MCAST flag to the outgoing packet */ 1612 mb_copy->m_flags |= M_MCAST; 1613 1614 /* 1615 * If we sourced the packet, call ip6_output since we may devide 1616 * the packet into fragments when the packet is too big for the 1617 * outgoing interface. 1618 * Otherwise, we can simply send the packet to the interface 1619 * sending queue. 1620 */ 1621 if (m->m_pkthdr.rcvif == NULL) { 1622 struct ip6_moptions im6o; 1623 1624 im6o.im6o_multicast_ifp = ifp; 1625 /* XXX: ip6_output will override ip6->ip6_hlim */ 1626 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1627 im6o.im6o_multicast_loop = 1; 1628 error = ip6_output(mb_copy, NULL, &mifp->m6_route, 1629 IPV6_FORWARDING, &im6o, NULL, NULL); 1630 1631#ifdef MRT6DEBUG 1632 if (V_mrt6debug & DEBUG_XMIT) 1633 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1634 mifp - mif6table, error); 1635#endif 1636 return; 1637 } 1638 1639 /* 1640 * If configured to loop back multicasts by default, 1641 * loop back a copy now. 1642 */ 1643 if (in6_mcast_loop) { 1644 dst6->sin6_len = sizeof(struct sockaddr_in6); 1645 dst6->sin6_family = AF_INET6; 1646 dst6->sin6_addr = ip6->ip6_dst; 1647 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst); 1648 } 1649 1650 /* 1651 * Put the packet into the sending queue of the outgoing interface 1652 * if it would fit in the MTU of the interface. 1653 */ 1654 linkmtu = IN6_LINKMTU(ifp); 1655 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1656 dst6->sin6_len = sizeof(struct sockaddr_in6); 1657 dst6->sin6_family = AF_INET6; 1658 dst6->sin6_addr = ip6->ip6_dst; 1659 /* 1660 * We just call if_output instead of nd6_output here, since 1661 * we need no ND for a multicast forwarded packet...right? 1662 */ 1663 error = (*ifp->if_output)(ifp, mb_copy, 1664 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL); 1665#ifdef MRT6DEBUG 1666 if (V_mrt6debug & DEBUG_XMIT) 1667 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1668 mifp - mif6table, error); 1669#endif 1670 } else { 1671 /* 1672 * pMTU discovery is intentionally disabled by default, since 1673 * various router may notify pMTU in multicast, which can be 1674 * a DDoS to a router 1675 */ 1676 if (V_ip6_mcast_pmtu) 1677 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1678 else { 1679#ifdef MRT6DEBUG 1680 if (V_mrt6debug & DEBUG_XMIT) { 1681 char ip6bufs[INET6_ADDRSTRLEN]; 1682 char ip6bufd[INET6_ADDRSTRLEN]; 1683 log(LOG_DEBUG, 1684 "phyint_send: packet too big on %s o %s " 1685 "g %s size %d(discarded)\n", 1686 if_name(ifp), 1687 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1688 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1689 mb_copy->m_pkthdr.len); 1690 } 1691#endif /* MRT6DEBUG */ 1692 m_freem(mb_copy); /* simply discard the packet */ 1693 } 1694 } 1695} 1696 1697static int 1698register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1699{ 1700 struct mbuf *mm; 1701 int i, len = m->m_pkthdr.len; 1702 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1703 struct mrt6msg *im6; 1704 1705#ifdef MRT6DEBUG 1706 if (V_mrt6debug) { 1707 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1708 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1709 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1710 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1711 } 1712#endif 1713 ++pim6stat.pim6s_snd_registers; 1714 1715 /* Make a copy of the packet to send to the user level process */ 1716 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1717 if (mm == NULL) 1718 return (ENOBUFS); 1719 mm->m_pkthdr.rcvif = NULL; 1720 mm->m_data += max_linkhdr; 1721 mm->m_len = sizeof(struct ip6_hdr); 1722 1723 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1724 m_freem(mm); 1725 return (ENOBUFS); 1726 } 1727 i = MHLEN - M_LEADINGSPACE(mm); 1728 if (i > len) 1729 i = len; 1730 mm = m_pullup(mm, i); 1731 if (mm == NULL) 1732 return (ENOBUFS); 1733/* TODO: check it! */ 1734 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1735 1736 /* 1737 * Send message to routing daemon 1738 */ 1739 sin6.sin6_addr = ip6->ip6_src; 1740 1741 im6 = mtod(mm, struct mrt6msg *); 1742 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1743 im6->im6_mbz = 0; 1744 1745 im6->im6_mif = mif - mif6table; 1746 1747 /* iif info is not given for reg. encap.n */ 1748 mrt6stat.mrt6s_upcalls++; 1749 1750 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1751#ifdef MRT6DEBUG 1752 if (V_mrt6debug) 1753 log(LOG_WARNING, 1754 "register_send: ip6_mrouter socket queue full\n"); 1755#endif 1756 ++mrt6stat.mrt6s_upq_sockfull; 1757 return (ENOBUFS); 1758 } 1759 return (0); 1760} 1761 1762/* 1763 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1764 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1765 * into the kernel. 1766 */ 1767static int 1768pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1769{ 1770 1771#ifdef DIAGNOSTIC 1772 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1773#endif 1774 if (proto != IPPROTO_PIM) 1775 return 0; /* not for us; reject the datagram. */ 1776 1777 return 64; /* claim the datagram. */ 1778} 1779 1780/* 1781 * PIM sparse mode hook 1782 * Receives the pim control messages, and passes them up to the listening 1783 * socket, using rip6_input. 1784 * The only message processed is the REGISTER pim message; the pim header 1785 * is stripped off, and the inner packet is passed to register_mforward. 1786 */ 1787int 1788pim6_input(struct mbuf **mp, int *offp, int proto) 1789{ 1790 struct pim *pim; /* pointer to a pim struct */ 1791 struct ip6_hdr *ip6; 1792 int pimlen; 1793 struct mbuf *m = *mp; 1794 int minlen; 1795 int off = *offp; 1796 1797 ++pim6stat.pim6s_rcv_total; 1798 1799 ip6 = mtod(m, struct ip6_hdr *); 1800 pimlen = m->m_pkthdr.len - *offp; 1801 1802 /* 1803 * Validate lengths 1804 */ 1805 if (pimlen < PIM_MINLEN) { 1806 ++pim6stat.pim6s_rcv_tooshort; 1807#ifdef MRT6DEBUG 1808 if (V_mrt6debug & DEBUG_PIM) 1809 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1810#endif 1811 m_freem(m); 1812 return (IPPROTO_DONE); 1813 } 1814 1815 /* 1816 * if the packet is at least as big as a REGISTER, go ahead 1817 * and grab the PIM REGISTER header size, to avoid another 1818 * possible m_pullup() later. 1819 * 1820 * PIM_MINLEN == pimhdr + u_int32 == 8 1821 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1822 */ 1823 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1824 1825 /* 1826 * Make sure that the IP6 and PIM headers in contiguous memory, and 1827 * possibly the PIM REGISTER header 1828 */ 1829#ifndef PULLDOWN_TEST 1830 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1831 /* adjust pointer */ 1832 ip6 = mtod(m, struct ip6_hdr *); 1833 1834 /* adjust mbuf to point to the PIM header */ 1835 pim = (struct pim *)((caddr_t)ip6 + off); 1836#else 1837 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1838 if (pim == NULL) { 1839 pim6stat.pim6s_rcv_tooshort++; 1840 return (IPPROTO_DONE); 1841 } 1842#endif 1843 1844#define PIM6_CHECKSUM 1845#ifdef PIM6_CHECKSUM 1846 { 1847 int cksumlen; 1848 1849 /* 1850 * Validate checksum. 1851 * If PIM REGISTER, exclude the data packet 1852 */ 1853 if (pim->pim_type == PIM_REGISTER) 1854 cksumlen = PIM_MINLEN; 1855 else 1856 cksumlen = pimlen; 1857 1858 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1859 ++pim6stat.pim6s_rcv_badsum; 1860#ifdef MRT6DEBUG 1861 if (V_mrt6debug & DEBUG_PIM) 1862 log(LOG_DEBUG, 1863 "pim6_input: invalid checksum\n"); 1864#endif 1865 m_freem(m); 1866 return (IPPROTO_DONE); 1867 } 1868 } 1869#endif /* PIM_CHECKSUM */ 1870 1871 /* PIM version check */ 1872 if (pim->pim_ver != PIM_VERSION) { 1873 ++pim6stat.pim6s_rcv_badversion; 1874#ifdef MRT6DEBUG 1875 log(LOG_ERR, 1876 "pim6_input: incorrect version %d, expecting %d\n", 1877 pim->pim_ver, PIM_VERSION); 1878#endif 1879 m_freem(m); 1880 return (IPPROTO_DONE); 1881 } 1882 1883 if (pim->pim_type == PIM_REGISTER) { 1884 /* 1885 * since this is a REGISTER, we'll make a copy of the register 1886 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1887 * routing daemon. 1888 */ 1889 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1890 1891 struct mbuf *mcp; 1892 struct ip6_hdr *eip6; 1893 u_int32_t *reghdr; 1894 int rc; 1895#ifdef MRT6DEBUG 1896 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1897#endif 1898 1899 ++pim6stat.pim6s_rcv_registers; 1900 1901 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1902#ifdef MRT6DEBUG 1903 if (V_mrt6debug & DEBUG_PIM) 1904 log(LOG_DEBUG, 1905 "pim6_input: register mif not set: %d\n", 1906 reg_mif_num); 1907#endif 1908 m_freem(m); 1909 return (IPPROTO_DONE); 1910 } 1911 1912 reghdr = (u_int32_t *)(pim + 1); 1913 1914 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1915 goto pim6_input_to_daemon; 1916 1917 /* 1918 * Validate length 1919 */ 1920 if (pimlen < PIM6_REG_MINLEN) { 1921 ++pim6stat.pim6s_rcv_tooshort; 1922 ++pim6stat.pim6s_rcv_badregisters; 1923#ifdef MRT6DEBUG 1924 log(LOG_ERR, 1925 "pim6_input: register packet size too " 1926 "small %d from %s\n", 1927 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1928#endif 1929 m_freem(m); 1930 return (IPPROTO_DONE); 1931 } 1932 1933 eip6 = (struct ip6_hdr *) (reghdr + 1); 1934#ifdef MRT6DEBUG 1935 if (V_mrt6debug & DEBUG_PIM) 1936 log(LOG_DEBUG, 1937 "pim6_input[register], eip6: %s -> %s, " 1938 "eip6 plen %d\n", 1939 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1940 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1941 ntohs(eip6->ip6_plen)); 1942#endif 1943 1944 /* verify the version number of the inner packet */ 1945 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1946 ++pim6stat.pim6s_rcv_badregisters; 1947#ifdef MRT6DEBUG 1948 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1949 "of the inner packet\n", 1950 (eip6->ip6_vfc & IPV6_VERSION)); 1951#endif 1952 m_freem(m); 1953 return (IPPROTO_NONE); 1954 } 1955 1956 /* verify the inner packet is destined to a mcast group */ 1957 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1958 ++pim6stat.pim6s_rcv_badregisters; 1959#ifdef MRT6DEBUG 1960 if (V_mrt6debug & DEBUG_PIM) 1961 log(LOG_DEBUG, 1962 "pim6_input: inner packet of register " 1963 "is not multicast %s\n", 1964 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1965#endif 1966 m_freem(m); 1967 return (IPPROTO_DONE); 1968 } 1969 1970 /* 1971 * make a copy of the whole header to pass to the daemon later. 1972 */ 1973 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1974 if (mcp == NULL) { 1975#ifdef MRT6DEBUG 1976 log(LOG_ERR, 1977 "pim6_input: pim register: " 1978 "could not copy register head\n"); 1979#endif 1980 m_freem(m); 1981 return (IPPROTO_DONE); 1982 } 1983 1984 /* 1985 * forward the inner ip6 packet; point m_data at the inner ip6. 1986 */ 1987 m_adj(m, off + PIM_MINLEN); 1988#ifdef MRT6DEBUG 1989 if (V_mrt6debug & DEBUG_PIM) { 1990 log(LOG_DEBUG, 1991 "pim6_input: forwarding decapsulated register: " 1992 "src %s, dst %s, mif %d\n", 1993 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1994 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1995 reg_mif_num); 1996 } 1997#endif 1998 1999 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 2000 dst.sin6_family, 0); 2001 2002 /* prepare the register head to send to the mrouting daemon */ 2003 m = mcp; 2004 } 2005 2006 /* 2007 * Pass the PIM message up to the daemon; if it is a register message 2008 * pass the 'head' only up to the daemon. This includes the 2009 * encapsulator ip6 header, pim header, register header and the 2010 * encapsulated ip6 header. 2011 */ 2012 pim6_input_to_daemon: 2013 rip6_input(&m, offp, proto); 2014 return (IPPROTO_DONE); 2015} 2016 2017static int 2018ip6_mroute_modevent(module_t mod, int type, void *unused) 2019{ 2020 2021 switch (type) { 2022 case MOD_LOAD: 2023 MROUTER6_LOCK_INIT(); 2024 MFC6_LOCK_INIT(); 2025 MIF6_LOCK_INIT(); 2026 2027 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 2028 pim6_encapcheck, 2029 (const struct protosw *)&in6_pim_protosw, NULL); 2030 if (pim6_encap_cookie == NULL) { 2031 printf("ip6_mroute: unable to attach pim6 encap\n"); 2032 MIF6_LOCK_DESTROY(); 2033 MFC6_LOCK_DESTROY(); 2034 MROUTER6_LOCK_DESTROY(); 2035 return (EINVAL); 2036 } 2037 2038 ip6_mforward = X_ip6_mforward; 2039 ip6_mrouter_done = X_ip6_mrouter_done; 2040 ip6_mrouter_get = X_ip6_mrouter_get; 2041 ip6_mrouter_set = X_ip6_mrouter_set; 2042 mrt6_ioctl = X_mrt6_ioctl; 2043 break; 2044 2045 case MOD_UNLOAD: 2046 if (V_ip6_mrouter != NULL) 2047 return EINVAL; 2048 2049 if (pim6_encap_cookie) { 2050 encap_detach(pim6_encap_cookie); 2051 pim6_encap_cookie = NULL; 2052 } 2053 X_ip6_mrouter_done(); 2054 ip6_mforward = NULL; 2055 ip6_mrouter_done = NULL; 2056 ip6_mrouter_get = NULL; 2057 ip6_mrouter_set = NULL; 2058 mrt6_ioctl = NULL; 2059 2060 MIF6_LOCK_DESTROY(); 2061 MFC6_LOCK_DESTROY(); 2062 MROUTER6_LOCK_DESTROY(); 2063 break; 2064 2065 default: 2066 return (EOPNOTSUPP); 2067 } 2068 2069 return (0); 2070} 2071 2072static moduledata_t ip6_mroutemod = { 2073 "ip6_mroute", 2074 ip6_mroute_modevent, 2075 0 2076}; 2077 2078DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2079