ip6_mroute.c revision 207369
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 207369 2010-04-29 11:52:42Z bz $"); 83 84#include "opt_inet.h" 85#include "opt_inet6.h" 86 87#include <sys/param.h> 88#include <sys/callout.h> 89#include <sys/errno.h> 90#include <sys/kernel.h> 91#include <sys/lock.h> 92#include <sys/malloc.h> 93#include <sys/mbuf.h> 94#include <sys/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 int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 134static int set_pim6(int *); 135static int socket_send(struct socket *, struct mbuf *, 136 struct sockaddr_in6 *); 137 138extern int in6_mcast_loop; 139extern struct domain inet6domain; 140 141static const struct encaptab *pim6_encap_cookie; 142static const struct ip6protosw in6_pim_protosw = { 143 .pr_type = SOCK_RAW, 144 .pr_domain = &inet6domain, 145 .pr_protocol = IPPROTO_PIM, 146 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 147 .pr_input = pim6_input, 148 .pr_output = rip6_output, 149 .pr_ctloutput = rip6_ctloutput, 150 .pr_usrreqs = &rip6_usrreqs 151}; 152static int pim6_encapcheck(const struct mbuf *, int, int, void *); 153 154static VNET_DEFINE(int, ip6_mrouter_ver) = 0; 155#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 156 157SYSCTL_DECL(_net_inet6); 158SYSCTL_DECL(_net_inet6_ip6); 159SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 160 161static struct mrt6stat mrt6stat; 162SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 163 &mrt6stat, mrt6stat, 164 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 165 166#define NO_RTE_FOUND 0x1 167#define RTE_FOUND 0x2 168 169static struct mtx mrouter6_mtx; 170#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 171#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 172#define MROUTER6_LOCK_ASSERT() do { \ 173 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 174 NET_ASSERT_GIANT(); \ 175} while (0) 176#define MROUTER6_LOCK_INIT() \ 177 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 178#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 179 180static struct mf6c *mf6ctable[MF6CTBLSIZ]; 181SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 182 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 183 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 184 "netinet6/ip6_mroute.h)"); 185 186static struct mtx mfc6_mtx; 187#define MFC6_LOCK() mtx_lock(&mfc6_mtx) 188#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 189#define MFC6_LOCK_ASSERT() do { \ 190 mtx_assert(&mfc6_mtx, MA_OWNED); \ 191 NET_ASSERT_GIANT(); \ 192} while (0) 193#define MFC6_LOCK_INIT() \ 194 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 195#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 196 197static u_char n6expire[MF6CTBLSIZ]; 198 199static struct mif6 mif6table[MAXMIFS]; 200SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 201 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]", 202 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)"); 203 204static struct mtx mif6_mtx; 205#define MIF6_LOCK() mtx_lock(&mif6_mtx) 206#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 207#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 208#define MIF6_LOCK_INIT() \ 209 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 210#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 211 212#ifdef MRT6DEBUG 213static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */ 214#define V_mrt6debug VNET(mrt6debug) 215#define DEBUG_MFC 0x02 216#define DEBUG_FORWARD 0x04 217#define DEBUG_EXPIRE 0x08 218#define DEBUG_XMIT 0x10 219#define DEBUG_REG 0x20 220#define DEBUG_PIM 0x40 221#endif 222 223static void expire_upcalls(void *); 224#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 225#define UPCALL_EXPIRE 6 /* number of timeouts */ 226 227/* 228 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 229 */ 230 231/* 232 * 'Interfaces' associated with decapsulator (so we can tell 233 * packets that went through it from ones that get reflected 234 * by a broken gateway). Different from IPv4 register_if, 235 * these interfaces are linked into the system ifnet list, 236 * because per-interface IPv6 statistics are maintained in 237 * ifp->if_afdata. But it does not have any routes point 238 * to them. I.e., packets can't be sent this way. They 239 * only exist as a placeholder for multicast source 240 * verification. 241 */ 242static struct ifnet *multicast_register_if6; 243 244#define ENCAP_HOPS 64 245 246/* 247 * Private variables. 248 */ 249static mifi_t nummifs = 0; 250static mifi_t reg_mif_num = (mifi_t)-1; 251 252static struct pim6stat pim6stat; 253SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 254 &pim6stat, pim6stat, 255 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 256 257static VNET_DEFINE(int, pim6); 258#define V_pim6 VNET(pim6) 259 260/* 261 * Hash function for a source, group entry 262 */ 263#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 264 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 265 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 266 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 267 268/* 269 * Find a route for a given origin IPv6 address and Multicast group address. 270 */ 271#define MF6CFIND(o, g, rt) do { \ 272 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 273 rt = NULL; \ 274 mrt6stat.mrt6s_mfc_lookups++; \ 275 while (_rt) { \ 276 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 277 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 278 (_rt->mf6c_stall == NULL)) { \ 279 rt = _rt; \ 280 break; \ 281 } \ 282 _rt = _rt->mf6c_next; \ 283 } \ 284 if (rt == NULL) { \ 285 mrt6stat.mrt6s_mfc_misses++; \ 286 } \ 287} while (/*CONSTCOND*/ 0) 288 289/* 290 * Macros to compute elapsed time efficiently 291 * Borrowed from Van Jacobson's scheduling code 292 * XXX: replace with timersub() ? 293 */ 294#define TV_DELTA(a, b, delta) do { \ 295 int xxs; \ 296 \ 297 delta = (a).tv_usec - (b).tv_usec; \ 298 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 299 switch (xxs) { \ 300 case 2: \ 301 delta += 1000000; \ 302 /* FALLTHROUGH */ \ 303 case 1: \ 304 delta += 1000000; \ 305 break; \ 306 default: \ 307 delta += (1000000 * xxs); \ 308 } \ 309 } \ 310} while (/*CONSTCOND*/ 0) 311 312/* XXX: replace with timercmp(a, b, <) ? */ 313#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 314 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 315 316#ifdef UPCALL_TIMING 317#define UPCALL_MAX 50 318static u_long upcall_data[UPCALL_MAX + 1]; 319static void collate(); 320#endif /* UPCALL_TIMING */ 321 322static int ip6_mrouter_init(struct socket *, int, int); 323static int add_m6fc(struct mf6cctl *); 324static int add_m6if(struct mif6ctl *); 325static int del_m6fc(struct mf6cctl *); 326static int del_m6if(mifi_t *); 327static int del_m6if_locked(mifi_t *); 328static int get_mif6_cnt(struct sioc_mif_req6 *); 329static int get_sg_cnt(struct sioc_sg_req6 *); 330 331static struct callout expire_upcalls_ch; 332 333int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 334int X_ip6_mrouter_done(void); 335int X_ip6_mrouter_set(struct socket *, struct sockopt *); 336int X_ip6_mrouter_get(struct socket *, struct sockopt *); 337int X_mrt6_ioctl(u_long, caddr_t); 338 339/* 340 * Handle MRT setsockopt commands to modify the multicast routing tables. 341 */ 342int 343X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 344{ 345 int error = 0; 346 int optval; 347 struct mif6ctl mifc; 348 struct mf6cctl mfcc; 349 mifi_t mifi; 350 351 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 352 return (EACCES); 353 354 switch (sopt->sopt_name) { 355 case MRT6_INIT: 356#ifdef MRT6_OINIT 357 case MRT6_OINIT: 358#endif 359 error = sooptcopyin(sopt, &optval, sizeof(optval), 360 sizeof(optval)); 361 if (error) 362 break; 363 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 364 break; 365 case MRT6_DONE: 366 error = X_ip6_mrouter_done(); 367 break; 368 case MRT6_ADD_MIF: 369 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 370 if (error) 371 break; 372 error = add_m6if(&mifc); 373 break; 374 case MRT6_ADD_MFC: 375 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 376 if (error) 377 break; 378 error = add_m6fc(&mfcc); 379 break; 380 case MRT6_DEL_MFC: 381 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 382 if (error) 383 break; 384 error = del_m6fc(&mfcc); 385 break; 386 case MRT6_DEL_MIF: 387 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 388 if (error) 389 break; 390 error = del_m6if(&mifi); 391 break; 392 case MRT6_PIM: 393 error = sooptcopyin(sopt, &optval, sizeof(optval), 394 sizeof(optval)); 395 if (error) 396 break; 397 error = set_pim6(&optval); 398 break; 399 default: 400 error = EOPNOTSUPP; 401 break; 402 } 403 404 return (error); 405} 406 407/* 408 * Handle MRT getsockopt commands 409 */ 410int 411X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 412{ 413 int error = 0; 414 415 if (so != V_ip6_mrouter) 416 return (EACCES); 417 418 switch (sopt->sopt_name) { 419 case MRT6_PIM: 420 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 421 break; 422 } 423 return (error); 424} 425 426/* 427 * Handle ioctl commands to obtain information from the cache 428 */ 429int 430X_mrt6_ioctl(u_long cmd, caddr_t data) 431{ 432 int ret; 433 434 ret = EINVAL; 435 436 switch (cmd) { 437 case SIOCGETSGCNT_IN6: 438 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 439 break; 440 441 case SIOCGETMIFCNT_IN6: 442 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 443 break; 444 445 default: 446 break; 447 } 448 449 return (ret); 450} 451 452/* 453 * returns the packet, byte, rpf-failure count for the source group provided 454 */ 455static int 456get_sg_cnt(struct sioc_sg_req6 *req) 457{ 458 struct mf6c *rt; 459 int ret; 460 461 ret = 0; 462 463 MFC6_LOCK(); 464 465 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 466 if (rt == NULL) { 467 ret = ESRCH; 468 } else { 469 req->pktcnt = rt->mf6c_pkt_cnt; 470 req->bytecnt = rt->mf6c_byte_cnt; 471 req->wrong_if = rt->mf6c_wrong_if; 472 } 473 474 MFC6_UNLOCK(); 475 476 return (ret); 477} 478 479/* 480 * returns the input and output packet and byte counts on the mif provided 481 */ 482static int 483get_mif6_cnt(struct sioc_mif_req6 *req) 484{ 485 mifi_t mifi; 486 int ret; 487 488 ret = 0; 489 mifi = req->mifi; 490 491 MIF6_LOCK(); 492 493 if (mifi >= nummifs) { 494 ret = EINVAL; 495 } else { 496 req->icount = mif6table[mifi].m6_pkt_in; 497 req->ocount = mif6table[mifi].m6_pkt_out; 498 req->ibytes = mif6table[mifi].m6_bytes_in; 499 req->obytes = mif6table[mifi].m6_bytes_out; 500 } 501 502 MIF6_UNLOCK(); 503 504 return (ret); 505} 506 507static int 508set_pim6(int *i) 509{ 510 if ((*i != 1) && (*i != 0)) 511 return (EINVAL); 512 513 V_pim6 = *i; 514 515 return (0); 516} 517 518/* 519 * Enable multicast routing 520 */ 521static int 522ip6_mrouter_init(struct socket *so, int v, int cmd) 523{ 524 525#ifdef MRT6DEBUG 526 if (V_mrt6debug) 527 log(LOG_DEBUG, 528 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 529 so->so_type, so->so_proto->pr_protocol); 530#endif 531 532 if (so->so_type != SOCK_RAW || 533 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 534 return (EOPNOTSUPP); 535 536 if (v != 1) 537 return (ENOPROTOOPT); 538 539 MROUTER6_LOCK(); 540 541 if (V_ip6_mrouter != NULL) { 542 MROUTER6_UNLOCK(); 543 return (EADDRINUSE); 544 } 545 546 V_ip6_mrouter = so; 547 V_ip6_mrouter_ver = cmd; 548 549 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 550 bzero((caddr_t)n6expire, sizeof(n6expire)); 551 552 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 553 554 callout_init(&expire_upcalls_ch, 0); 555 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 556 expire_upcalls, NULL); 557 558 MROUTER6_UNLOCK(); 559 560#ifdef MRT6DEBUG 561 if (V_mrt6debug) 562 log(LOG_DEBUG, "ip6_mrouter_init\n"); 563#endif 564 565 return (0); 566} 567 568/* 569 * Disable IPv6 multicast forwarding. 570 */ 571int 572X_ip6_mrouter_done(void) 573{ 574 mifi_t mifi; 575 int i; 576 struct mf6c *rt; 577 struct rtdetq *rte; 578 579 MROUTER6_LOCK(); 580 581 if (V_ip6_mrouter == NULL) { 582 MROUTER6_UNLOCK(); 583 return (EINVAL); 584 } 585 586 /* 587 * For each phyint in use, disable promiscuous reception of all IPv6 588 * multicasts. 589 */ 590 for (mifi = 0; mifi < nummifs; mifi++) { 591 if (mif6table[mifi].m6_ifp && 592 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 593 if_allmulti(mif6table[mifi].m6_ifp, 0); 594 } 595 } 596 bzero((caddr_t)mif6table, sizeof(mif6table)); 597 nummifs = 0; 598 599 V_pim6 = 0; /* used to stub out/in pim specific code */ 600 601 callout_stop(&expire_upcalls_ch); 602 603 /* 604 * Free all multicast forwarding cache entries. 605 */ 606 MFC6_LOCK(); 607 for (i = 0; i < MF6CTBLSIZ; i++) { 608 rt = mf6ctable[i]; 609 while (rt) { 610 struct mf6c *frt; 611 612 for (rte = rt->mf6c_stall; rte != NULL; ) { 613 struct rtdetq *n = rte->next; 614 615 m_free(rte->m); 616 free(rte, M_MRTABLE6); 617 rte = n; 618 } 619 frt = rt; 620 rt = rt->mf6c_next; 621 free(frt, M_MRTABLE6); 622 } 623 } 624 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 625 MFC6_UNLOCK(); 626 627 /* 628 * Reset register interface 629 */ 630 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 631 if_detach(multicast_register_if6); 632 if_free(multicast_register_if6); 633 reg_mif_num = (mifi_t)-1; 634 multicast_register_if6 = NULL; 635 } 636 637 V_ip6_mrouter = NULL; 638 V_ip6_mrouter_ver = 0; 639 640 MROUTER6_UNLOCK(); 641 642#ifdef MRT6DEBUG 643 if (V_mrt6debug) 644 log(LOG_DEBUG, "ip6_mrouter_done\n"); 645#endif 646 647 return (0); 648} 649 650static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 651 652/* 653 * Add a mif to the mif table 654 */ 655static int 656add_m6if(struct mif6ctl *mifcp) 657{ 658 struct mif6 *mifp; 659 struct ifnet *ifp; 660 int error; 661 662 MIF6_LOCK(); 663 664 if (mifcp->mif6c_mifi >= MAXMIFS) { 665 MIF6_UNLOCK(); 666 return (EINVAL); 667 } 668 mifp = mif6table + mifcp->mif6c_mifi; 669 if (mifp->m6_ifp != NULL) { 670 MIF6_UNLOCK(); 671 return (EADDRINUSE); /* XXX: is it appropriate? */ 672 } 673 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 674 MIF6_UNLOCK(); 675 return (ENXIO); 676 } 677 678 ifp = ifnet_byindex(mifcp->mif6c_pifi); 679 680 if (mifcp->mif6c_flags & MIFF_REGISTER) { 681 if (reg_mif_num == (mifi_t)-1) { 682 ifp = if_alloc(IFT_OTHER); 683 684 if_initname(ifp, "register_mif", 0); 685 ifp->if_flags |= IFF_LOOPBACK; 686 if_attach(ifp); 687 multicast_register_if6 = ifp; 688 reg_mif_num = mifcp->mif6c_mifi; 689 /* 690 * it is impossible to guess the ifindex of the 691 * register interface. So mif6c_pifi is automatically 692 * calculated. 693 */ 694 mifcp->mif6c_pifi = ifp->if_index; 695 } else { 696 ifp = multicast_register_if6; 697 } 698 } else { 699 /* Make sure the interface supports multicast */ 700 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 701 MIF6_UNLOCK(); 702 return (EOPNOTSUPP); 703 } 704 705 error = if_allmulti(ifp, 1); 706 if (error) { 707 MIF6_UNLOCK(); 708 return (error); 709 } 710 } 711 712 mifp->m6_flags = mifcp->mif6c_flags; 713 mifp->m6_ifp = ifp; 714 715 /* initialize per mif pkt counters */ 716 mifp->m6_pkt_in = 0; 717 mifp->m6_pkt_out = 0; 718 mifp->m6_bytes_in = 0; 719 mifp->m6_bytes_out = 0; 720 bzero(&mifp->m6_route, sizeof(mifp->m6_route)); 721 722 /* Adjust nummifs up if the mifi is higher than nummifs */ 723 if (nummifs <= mifcp->mif6c_mifi) 724 nummifs = mifcp->mif6c_mifi + 1; 725 726 MIF6_UNLOCK(); 727 728#ifdef MRT6DEBUG 729 if (V_mrt6debug) 730 log(LOG_DEBUG, 731 "add_mif #%d, phyint %s\n", 732 mifcp->mif6c_mifi, 733 ifp->if_xname); 734#endif 735 736 return (0); 737} 738 739/* 740 * Delete a mif from the mif table 741 */ 742static int 743del_m6if_locked(mifi_t *mifip) 744{ 745 struct mif6 *mifp = mif6table + *mifip; 746 mifi_t mifi; 747 struct ifnet *ifp; 748 749 MIF6_LOCK_ASSERT(); 750 751 if (*mifip >= nummifs) 752 return (EINVAL); 753 if (mifp->m6_ifp == NULL) 754 return (EINVAL); 755 756 if (!(mifp->m6_flags & MIFF_REGISTER)) { 757 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 758 ifp = mifp->m6_ifp; 759 if_allmulti(ifp, 0); 760 } else { 761 if (reg_mif_num != (mifi_t)-1 && 762 multicast_register_if6 != NULL) { 763 if_detach(multicast_register_if6); 764 if_free(multicast_register_if6); 765 reg_mif_num = (mifi_t)-1; 766 multicast_register_if6 = NULL; 767 } 768 } 769 770 bzero((caddr_t)mifp, sizeof(*mifp)); 771 772 /* Adjust nummifs down */ 773 for (mifi = nummifs; mifi > 0; mifi--) 774 if (mif6table[mifi - 1].m6_ifp) 775 break; 776 nummifs = mifi; 777 778#ifdef MRT6DEBUG 779 if (V_mrt6debug) 780 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 781#endif 782 783 return (0); 784} 785 786static int 787del_m6if(mifi_t *mifip) 788{ 789 int cc; 790 791 MIF6_LOCK(); 792 cc = del_m6if_locked(mifip); 793 MIF6_UNLOCK(); 794 795 return (cc); 796} 797 798/* 799 * Add an mfc entry 800 */ 801static int 802add_m6fc(struct mf6cctl *mfccp) 803{ 804 struct mf6c *rt; 805 u_long hash; 806 struct rtdetq *rte; 807 u_short nstl; 808 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 809 810 MFC6_LOCK(); 811 812 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 813 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 814 815 /* If an entry already exists, just update the fields */ 816 if (rt) { 817#ifdef MRT6DEBUG 818 if (V_mrt6debug & DEBUG_MFC) { 819 log(LOG_DEBUG, 820 "add_m6fc no upcall h %d o %s g %s p %x\n", 821 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 822 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 823 mfccp->mf6cc_parent); 824 } 825#endif 826 827 rt->mf6c_parent = mfccp->mf6cc_parent; 828 rt->mf6c_ifset = mfccp->mf6cc_ifset; 829 830 MFC6_UNLOCK(); 831 return (0); 832 } 833 834 /* 835 * Find the entry for which the upcall was made and update 836 */ 837 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 838 mfccp->mf6cc_mcastgrp.sin6_addr); 839 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 840 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 841 &mfccp->mf6cc_origin.sin6_addr) && 842 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 843 &mfccp->mf6cc_mcastgrp.sin6_addr) && 844 (rt->mf6c_stall != NULL)) { 845 846 if (nstl++) 847 log(LOG_ERR, 848 "add_m6fc: %s o %s g %s p %x dbx %p\n", 849 "multiple kernel entries", 850 ip6_sprintf(ip6bufo, 851 &mfccp->mf6cc_origin.sin6_addr), 852 ip6_sprintf(ip6bufg, 853 &mfccp->mf6cc_mcastgrp.sin6_addr), 854 mfccp->mf6cc_parent, rt->mf6c_stall); 855 856#ifdef MRT6DEBUG 857 if (V_mrt6debug & DEBUG_MFC) 858 log(LOG_DEBUG, 859 "add_m6fc o %s g %s p %x dbg %x\n", 860 ip6_sprintf(ip6bufo, 861 &mfccp->mf6cc_origin.sin6_addr), 862 ip6_sprintf(ip6bufg, 863 &mfccp->mf6cc_mcastgrp.sin6_addr), 864 mfccp->mf6cc_parent, rt->mf6c_stall); 865#endif 866 867 rt->mf6c_origin = mfccp->mf6cc_origin; 868 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 869 rt->mf6c_parent = mfccp->mf6cc_parent; 870 rt->mf6c_ifset = mfccp->mf6cc_ifset; 871 /* initialize pkt counters per src-grp */ 872 rt->mf6c_pkt_cnt = 0; 873 rt->mf6c_byte_cnt = 0; 874 rt->mf6c_wrong_if = 0; 875 876 rt->mf6c_expire = 0; /* Don't clean this guy up */ 877 n6expire[hash]--; 878 879 /* free packets Qed at the end of this entry */ 880 for (rte = rt->mf6c_stall; rte != NULL; ) { 881 struct rtdetq *n = rte->next; 882 ip6_mdq(rte->m, rte->ifp, rt); 883 m_freem(rte->m); 884#ifdef UPCALL_TIMING 885 collate(&(rte->t)); 886#endif /* UPCALL_TIMING */ 887 free(rte, M_MRTABLE6); 888 rte = n; 889 } 890 rt->mf6c_stall = NULL; 891 } 892 } 893 894 /* 895 * It is possible that an entry is being inserted without an upcall 896 */ 897 if (nstl == 0) { 898#ifdef MRT6DEBUG 899 if (V_mrt6debug & DEBUG_MFC) 900 log(LOG_DEBUG, 901 "add_mfc no upcall h %d o %s g %s p %x\n", 902 hash, 903 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 904 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 905 mfccp->mf6cc_parent); 906#endif 907 908 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 909 910 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 911 &mfccp->mf6cc_origin.sin6_addr)&& 912 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 913 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 914 915 rt->mf6c_origin = mfccp->mf6cc_origin; 916 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 917 rt->mf6c_parent = mfccp->mf6cc_parent; 918 rt->mf6c_ifset = mfccp->mf6cc_ifset; 919 /* initialize pkt counters per src-grp */ 920 rt->mf6c_pkt_cnt = 0; 921 rt->mf6c_byte_cnt = 0; 922 rt->mf6c_wrong_if = 0; 923 924 if (rt->mf6c_expire) 925 n6expire[hash]--; 926 rt->mf6c_expire = 0; 927 } 928 } 929 if (rt == NULL) { 930 /* no upcall, so make a new entry */ 931 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 932 M_NOWAIT); 933 if (rt == NULL) { 934 MFC6_UNLOCK(); 935 return (ENOBUFS); 936 } 937 938 /* insert new entry at head of hash chain */ 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 rt->mf6c_expire = 0; 948 rt->mf6c_stall = NULL; 949 950 /* link into table */ 951 rt->mf6c_next = mf6ctable[hash]; 952 mf6ctable[hash] = rt; 953 } 954 } 955 956 MFC6_UNLOCK(); 957 return (0); 958} 959 960#ifdef UPCALL_TIMING 961/* 962 * collect delay statistics on the upcalls 963 */ 964static void 965collate(struct timeval *t) 966{ 967 u_long d; 968 struct timeval tp; 969 u_long delta; 970 971 GET_TIME(tp); 972 973 if (TV_LT(*t, tp)) 974 { 975 TV_DELTA(tp, *t, delta); 976 977 d = delta >> 10; 978 if (d > UPCALL_MAX) 979 d = UPCALL_MAX; 980 981 ++upcall_data[d]; 982 } 983} 984#endif /* UPCALL_TIMING */ 985 986/* 987 * Delete an mfc entry 988 */ 989static int 990del_m6fc(struct mf6cctl *mfccp) 991{ 992 struct sockaddr_in6 origin; 993 struct sockaddr_in6 mcastgrp; 994 struct mf6c *rt; 995 struct mf6c **nptr; 996 u_long hash; 997 998 origin = mfccp->mf6cc_origin; 999 mcastgrp = mfccp->mf6cc_mcastgrp; 1000 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1001 1002#ifdef MRT6DEBUG 1003 if (V_mrt6debug & DEBUG_MFC) { 1004 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1005 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 1006 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1007 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1008 } 1009#endif 1010 1011 MFC6_LOCK(); 1012 1013 nptr = &mf6ctable[hash]; 1014 while ((rt = *nptr) != NULL) { 1015 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1016 &rt->mf6c_origin.sin6_addr) && 1017 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1018 &rt->mf6c_mcastgrp.sin6_addr) && 1019 rt->mf6c_stall == NULL) 1020 break; 1021 1022 nptr = &rt->mf6c_next; 1023 } 1024 if (rt == NULL) { 1025 MFC6_UNLOCK(); 1026 return (EADDRNOTAVAIL); 1027 } 1028 1029 *nptr = rt->mf6c_next; 1030 free(rt, M_MRTABLE6); 1031 1032 MFC6_UNLOCK(); 1033 1034 return (0); 1035} 1036 1037static int 1038socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1039{ 1040 1041 if (s) { 1042 if (sbappendaddr(&s->so_rcv, 1043 (struct sockaddr *)src, 1044 mm, (struct mbuf *)0) != 0) { 1045 sorwakeup(s); 1046 return (0); 1047 } 1048 } 1049 m_freem(mm); 1050 return (-1); 1051} 1052 1053/* 1054 * IPv6 multicast forwarding function. This function assumes that the packet 1055 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1056 * pointed to by "ifp", and the packet is to be relayed to other networks 1057 * that have members of the packet's destination IPv6 multicast group. 1058 * 1059 * The packet is returned unscathed to the caller, unless it is 1060 * erroneous, in which case a non-zero return value tells the caller to 1061 * discard it. 1062 * 1063 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1064 * this function is called in the originating context (i.e., not when 1065 * forwarding a packet from other node). ip6_output(), which is currently the 1066 * only function that calls this function is called in the originating context, 1067 * explicitly ensures this condition. It is caller's responsibility to ensure 1068 * that if this function is called from somewhere else in the originating 1069 * context in the future. 1070 */ 1071int 1072X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1073{ 1074 struct mf6c *rt; 1075 struct mif6 *mifp; 1076 struct mbuf *mm; 1077 mifi_t mifi; 1078 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1079 1080#ifdef MRT6DEBUG 1081 if (V_mrt6debug & DEBUG_FORWARD) 1082 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1083 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1085 ifp->if_index); 1086#endif 1087 1088 /* 1089 * Don't forward a packet with Hop limit of zero or one, 1090 * or a packet destined to a local-only group. 1091 */ 1092 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1093 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1094 return (0); 1095 ip6->ip6_hlim--; 1096 1097 /* 1098 * Source address check: do not forward packets with unspecified 1099 * source. It was discussed in July 2000, on ipngwg mailing list. 1100 * This is rather more serious than unicast cases, because some 1101 * MLD packets can be sent with the unspecified source address 1102 * (although such packets must normally set 1 to the hop limit field). 1103 */ 1104 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1105 V_ip6stat.ip6s_cantforward++; 1106 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1107 V_ip6_log_time = time_second; 1108 log(LOG_DEBUG, 1109 "cannot forward " 1110 "from %s to %s nxt %d received on %s\n", 1111 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1112 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1113 ip6->ip6_nxt, 1114 if_name(m->m_pkthdr.rcvif)); 1115 } 1116 return (0); 1117 } 1118 1119 MFC6_LOCK(); 1120 1121 /* 1122 * Determine forwarding mifs from the forwarding cache table 1123 */ 1124 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1125 1126 /* Entry exists, so forward if necessary */ 1127 if (rt) { 1128 MFC6_UNLOCK(); 1129 return (ip6_mdq(m, ifp, rt)); 1130 } else { 1131 /* 1132 * If we don't have a route for packet's origin, 1133 * Make a copy of the packet & 1134 * send message to routing daemon 1135 */ 1136 1137 struct mbuf *mb0; 1138 struct rtdetq *rte; 1139 u_long hash; 1140/* int i, npkts;*/ 1141#ifdef UPCALL_TIMING 1142 struct timeval tp; 1143 1144 GET_TIME(tp); 1145#endif /* UPCALL_TIMING */ 1146 1147 mrt6stat.mrt6s_no_route++; 1148#ifdef MRT6DEBUG 1149 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1150 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1151 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1152 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1153#endif 1154 1155 /* 1156 * Allocate mbufs early so that we don't do extra work if we 1157 * are just going to fail anyway. 1158 */ 1159 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1160 M_NOWAIT); 1161 if (rte == NULL) { 1162 MFC6_UNLOCK(); 1163 return (ENOBUFS); 1164 } 1165 mb0 = m_copy(m, 0, M_COPYALL); 1166 /* 1167 * Pullup packet header if needed before storing it, 1168 * as other references may modify it in the meantime. 1169 */ 1170 if (mb0 && 1171 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1172 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1173 if (mb0 == NULL) { 1174 free(rte, M_MRTABLE6); 1175 MFC6_UNLOCK(); 1176 return (ENOBUFS); 1177 } 1178 1179 /* is there an upcall waiting for this packet? */ 1180 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1181 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1182 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1183 &rt->mf6c_origin.sin6_addr) && 1184 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1185 &rt->mf6c_mcastgrp.sin6_addr) && 1186 (rt->mf6c_stall != NULL)) 1187 break; 1188 } 1189 1190 if (rt == NULL) { 1191 struct mrt6msg *im; 1192#ifdef MRT6_OINIT 1193 struct omrt6msg *oim; 1194#endif 1195 1196 /* no upcall, so make a new entry */ 1197 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1198 M_NOWAIT); 1199 if (rt == NULL) { 1200 free(rte, M_MRTABLE6); 1201 m_freem(mb0); 1202 MFC6_UNLOCK(); 1203 return (ENOBUFS); 1204 } 1205 /* 1206 * Make a copy of the header to send to the user 1207 * level process 1208 */ 1209 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1210 1211 if (mm == NULL) { 1212 free(rte, M_MRTABLE6); 1213 m_freem(mb0); 1214 free(rt, M_MRTABLE6); 1215 MFC6_UNLOCK(); 1216 return (ENOBUFS); 1217 } 1218 1219 /* 1220 * Send message to routing daemon 1221 */ 1222 sin6.sin6_addr = ip6->ip6_src; 1223 1224 im = NULL; 1225#ifdef MRT6_OINIT 1226 oim = NULL; 1227#endif 1228 switch (V_ip6_mrouter_ver) { 1229#ifdef MRT6_OINIT 1230 case MRT6_OINIT: 1231 oim = mtod(mm, struct omrt6msg *); 1232 oim->im6_msgtype = MRT6MSG_NOCACHE; 1233 oim->im6_mbz = 0; 1234 break; 1235#endif 1236 case MRT6_INIT: 1237 im = mtod(mm, struct mrt6msg *); 1238 im->im6_msgtype = MRT6MSG_NOCACHE; 1239 im->im6_mbz = 0; 1240 break; 1241 default: 1242 free(rte, M_MRTABLE6); 1243 m_freem(mb0); 1244 free(rt, M_MRTABLE6); 1245 MFC6_UNLOCK(); 1246 return (EINVAL); 1247 } 1248 1249#ifdef MRT6DEBUG 1250 if (V_mrt6debug & DEBUG_FORWARD) 1251 log(LOG_DEBUG, 1252 "getting the iif info in the kernel\n"); 1253#endif 1254 1255 for (mifp = mif6table, mifi = 0; 1256 mifi < nummifs && mifp->m6_ifp != ifp; 1257 mifp++, mifi++) 1258 ; 1259 1260 switch (V_ip6_mrouter_ver) { 1261#ifdef MRT6_OINIT 1262 case MRT6_OINIT: 1263 oim->im6_mif = mifi; 1264 break; 1265#endif 1266 case MRT6_INIT: 1267 im->im6_mif = mifi; 1268 break; 1269 } 1270 1271 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1272 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1273 "socket queue full\n"); 1274 mrt6stat.mrt6s_upq_sockfull++; 1275 free(rte, M_MRTABLE6); 1276 m_freem(mb0); 1277 free(rt, M_MRTABLE6); 1278 MFC6_UNLOCK(); 1279 return (ENOBUFS); 1280 } 1281 1282 mrt6stat.mrt6s_upcalls++; 1283 1284 /* insert new entry at head of hash chain */ 1285 bzero(rt, sizeof(*rt)); 1286 rt->mf6c_origin.sin6_family = AF_INET6; 1287 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1288 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1289 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1290 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1291 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1292 rt->mf6c_expire = UPCALL_EXPIRE; 1293 n6expire[hash]++; 1294 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1295 1296 /* link into table */ 1297 rt->mf6c_next = mf6ctable[hash]; 1298 mf6ctable[hash] = rt; 1299 /* Add this entry to the end of the queue */ 1300 rt->mf6c_stall = rte; 1301 } else { 1302 /* determine if q has overflowed */ 1303 struct rtdetq **p; 1304 int npkts = 0; 1305 1306 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1307 if (++npkts > MAX_UPQ6) { 1308 mrt6stat.mrt6s_upq_ovflw++; 1309 free(rte, M_MRTABLE6); 1310 m_freem(mb0); 1311 MFC6_UNLOCK(); 1312 return (0); 1313 } 1314 1315 /* Add this entry to the end of the queue */ 1316 *p = rte; 1317 } 1318 1319 rte->next = NULL; 1320 rte->m = mb0; 1321 rte->ifp = ifp; 1322#ifdef UPCALL_TIMING 1323 rte->t = tp; 1324#endif /* UPCALL_TIMING */ 1325 1326 MFC6_UNLOCK(); 1327 1328 return (0); 1329 } 1330} 1331 1332/* 1333 * Clean up cache entries if upcalls are not serviced 1334 * Call from the Slow Timeout mechanism, every half second. 1335 */ 1336static void 1337expire_upcalls(void *unused) 1338{ 1339 struct rtdetq *rte; 1340 struct mf6c *mfc, **nptr; 1341 int i; 1342 1343 MFC6_LOCK(); 1344 for (i = 0; i < MF6CTBLSIZ; i++) { 1345 if (n6expire[i] == 0) 1346 continue; 1347 nptr = &mf6ctable[i]; 1348 while ((mfc = *nptr) != NULL) { 1349 rte = mfc->mf6c_stall; 1350 /* 1351 * Skip real cache entries 1352 * Make sure it wasn't marked to not expire (shouldn't happen) 1353 * If it expires now 1354 */ 1355 if (rte != NULL && 1356 mfc->mf6c_expire != 0 && 1357 --mfc->mf6c_expire == 0) { 1358#ifdef MRT6DEBUG 1359 if (V_mrt6debug & DEBUG_EXPIRE) { 1360 char ip6bufo[INET6_ADDRSTRLEN]; 1361 char ip6bufg[INET6_ADDRSTRLEN]; 1362 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1363 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1364 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1365 } 1366#endif 1367 /* 1368 * drop all the packets 1369 * free the mbuf with the pkt, if, timing info 1370 */ 1371 do { 1372 struct rtdetq *n = rte->next; 1373 m_freem(rte->m); 1374 free(rte, M_MRTABLE6); 1375 rte = n; 1376 } while (rte != NULL); 1377 mrt6stat.mrt6s_cache_cleanups++; 1378 n6expire[i]--; 1379 1380 *nptr = mfc->mf6c_next; 1381 free(mfc, M_MRTABLE6); 1382 } else { 1383 nptr = &mfc->mf6c_next; 1384 } 1385 } 1386 } 1387 MFC6_UNLOCK(); 1388 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1389 expire_upcalls, NULL); 1390} 1391 1392/* 1393 * Packet forwarding routine once entry in the cache is made 1394 */ 1395static int 1396ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1397{ 1398 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1399 mifi_t mifi, iif; 1400 struct mif6 *mifp; 1401 int plen = m->m_pkthdr.len; 1402 struct in6_addr src0, dst0; /* copies for local work */ 1403 u_int32_t iszone, idzone, oszone, odzone; 1404 int error = 0; 1405 1406/* 1407 * Macro to send packet on mif. Since RSVP packets don't get counted on 1408 * input, they shouldn't get counted on output, so statistics keeping is 1409 * separate. 1410 */ 1411 1412#define MC6_SEND(ip6, mifp, m) do { \ 1413 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1414 register_send((ip6), (mifp), (m)); \ 1415 else \ 1416 phyint_send((ip6), (mifp), (m)); \ 1417} while (/*CONSTCOND*/ 0) 1418 1419 /* 1420 * Don't forward if it didn't arrive from the parent mif 1421 * for its origin. 1422 */ 1423 mifi = rt->mf6c_parent; 1424 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1425 /* came in the wrong interface */ 1426#ifdef MRT6DEBUG 1427 if (V_mrt6debug & DEBUG_FORWARD) 1428 log(LOG_DEBUG, 1429 "wrong if: ifid %d mifi %d mififid %x\n", 1430 ifp->if_index, mifi, 1431 mif6table[mifi].m6_ifp->if_index); 1432#endif 1433 mrt6stat.mrt6s_wrong_if++; 1434 rt->mf6c_wrong_if++; 1435 /* 1436 * If we are doing PIM processing, and we are forwarding 1437 * packets on this interface, send a message to the 1438 * routing daemon. 1439 */ 1440 /* have to make sure this is a valid mif */ 1441 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1442 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1443 /* 1444 * Check the M_LOOP flag to avoid an 1445 * unnecessary PIM assert. 1446 * XXX: M_LOOP is an ad-hoc hack... 1447 */ 1448 static struct sockaddr_in6 sin6 = 1449 { sizeof(sin6), AF_INET6 }; 1450 1451 struct mbuf *mm; 1452 struct mrt6msg *im; 1453#ifdef MRT6_OINIT 1454 struct omrt6msg *oim; 1455#endif 1456 1457 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1458 if (mm && 1459 (M_HASCL(mm) || 1460 mm->m_len < sizeof(struct ip6_hdr))) 1461 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1462 if (mm == NULL) 1463 return (ENOBUFS); 1464 1465#ifdef MRT6_OINIT 1466 oim = NULL; 1467#endif 1468 im = NULL; 1469 switch (V_ip6_mrouter_ver) { 1470#ifdef MRT6_OINIT 1471 case MRT6_OINIT: 1472 oim = mtod(mm, struct omrt6msg *); 1473 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1474 oim->im6_mbz = 0; 1475 break; 1476#endif 1477 case MRT6_INIT: 1478 im = mtod(mm, struct mrt6msg *); 1479 im->im6_msgtype = MRT6MSG_WRONGMIF; 1480 im->im6_mbz = 0; 1481 break; 1482 default: 1483 m_freem(mm); 1484 return (EINVAL); 1485 } 1486 1487 for (mifp = mif6table, iif = 0; 1488 iif < nummifs && mifp && 1489 mifp->m6_ifp != ifp; 1490 mifp++, iif++) 1491 ; 1492 1493 switch (V_ip6_mrouter_ver) { 1494#ifdef MRT6_OINIT 1495 case MRT6_OINIT: 1496 oim->im6_mif = iif; 1497 sin6.sin6_addr = oim->im6_src; 1498 break; 1499#endif 1500 case MRT6_INIT: 1501 im->im6_mif = iif; 1502 sin6.sin6_addr = im->im6_src; 1503 break; 1504 } 1505 1506 mrt6stat.mrt6s_upcalls++; 1507 1508 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1509#ifdef MRT6DEBUG 1510 if (V_mrt6debug) 1511 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1512#endif 1513 ++mrt6stat.mrt6s_upq_sockfull; 1514 return (ENOBUFS); 1515 } /* if socket Q full */ 1516 } /* if PIM */ 1517 return (0); 1518 } /* if wrong iif */ 1519 1520 /* If I sourced this packet, it counts as output, else it was input. */ 1521 if (m->m_pkthdr.rcvif == NULL) { 1522 /* XXX: is rcvif really NULL when output?? */ 1523 mif6table[mifi].m6_pkt_out++; 1524 mif6table[mifi].m6_bytes_out += plen; 1525 } else { 1526 mif6table[mifi].m6_pkt_in++; 1527 mif6table[mifi].m6_bytes_in += plen; 1528 } 1529 rt->mf6c_pkt_cnt++; 1530 rt->mf6c_byte_cnt += plen; 1531 1532 /* 1533 * For each mif, forward a copy of the packet if there are group 1534 * members downstream on the interface. 1535 */ 1536 src0 = ip6->ip6_src; 1537 dst0 = ip6->ip6_dst; 1538 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1539 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1540 V_ip6stat.ip6s_badscope++; 1541 return (error); 1542 } 1543 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1544 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1545 /* 1546 * check if the outgoing packet is going to break 1547 * a scope boundary. 1548 * XXX For packets through PIM register tunnel 1549 * interface, we believe a routing daemon. 1550 */ 1551 if (!(mif6table[rt->mf6c_parent].m6_flags & 1552 MIFF_REGISTER) && 1553 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1554 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1555 &oszone) || 1556 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1557 &odzone) || 1558 iszone != oszone || 1559 idzone != odzone) { 1560 V_ip6stat.ip6s_badscope++; 1561 continue; 1562 } 1563 } 1564 1565 mifp->m6_pkt_out++; 1566 mifp->m6_bytes_out += plen; 1567 MC6_SEND(ip6, mifp, m); 1568 } 1569 } 1570 return (0); 1571} 1572 1573static void 1574phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1575{ 1576 struct mbuf *mb_copy; 1577 struct ifnet *ifp = mifp->m6_ifp; 1578 int error = 0; 1579 struct sockaddr_in6 *dst6; 1580 u_long linkmtu; 1581 1582 dst6 = &mifp->m6_route.ro_dst; 1583 1584 /* 1585 * Make a new reference to the packet; make sure that 1586 * the IPv6 header is actually copied, not just referenced, 1587 * so that ip6_output() only scribbles on the copy. 1588 */ 1589 mb_copy = m_copy(m, 0, M_COPYALL); 1590 if (mb_copy && 1591 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1592 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1593 if (mb_copy == NULL) { 1594 return; 1595 } 1596 /* set MCAST flag to the outgoing packet */ 1597 mb_copy->m_flags |= M_MCAST; 1598 1599 /* 1600 * If we sourced the packet, call ip6_output since we may devide 1601 * the packet into fragments when the packet is too big for the 1602 * outgoing interface. 1603 * Otherwise, we can simply send the packet to the interface 1604 * sending queue. 1605 */ 1606 if (m->m_pkthdr.rcvif == NULL) { 1607 struct ip6_moptions im6o; 1608 1609 im6o.im6o_multicast_ifp = ifp; 1610 /* XXX: ip6_output will override ip6->ip6_hlim */ 1611 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1612 im6o.im6o_multicast_loop = 1; 1613 error = ip6_output(mb_copy, NULL, &mifp->m6_route, 1614 IPV6_FORWARDING, &im6o, NULL, NULL); 1615 1616#ifdef MRT6DEBUG 1617 if (V_mrt6debug & DEBUG_XMIT) 1618 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1619 mifp - mif6table, error); 1620#endif 1621 return; 1622 } 1623 1624 /* 1625 * If configured to loop back multicasts by default, 1626 * loop back a copy now. 1627 */ 1628 if (in6_mcast_loop) { 1629 dst6->sin6_len = sizeof(struct sockaddr_in6); 1630 dst6->sin6_family = AF_INET6; 1631 dst6->sin6_addr = ip6->ip6_dst; 1632 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst); 1633 } 1634 1635 /* 1636 * Put the packet into the sending queue of the outgoing interface 1637 * if it would fit in the MTU of the interface. 1638 */ 1639 linkmtu = IN6_LINKMTU(ifp); 1640 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1641 dst6->sin6_len = sizeof(struct sockaddr_in6); 1642 dst6->sin6_family = AF_INET6; 1643 dst6->sin6_addr = ip6->ip6_dst; 1644 /* 1645 * We just call if_output instead of nd6_output here, since 1646 * we need no ND for a multicast forwarded packet...right? 1647 */ 1648 error = (*ifp->if_output)(ifp, mb_copy, 1649 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL); 1650#ifdef MRT6DEBUG 1651 if (V_mrt6debug & DEBUG_XMIT) 1652 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1653 mifp - mif6table, error); 1654#endif 1655 } else { 1656 /* 1657 * pMTU discovery is intentionally disabled by default, since 1658 * various router may notify pMTU in multicast, which can be 1659 * a DDoS to a router 1660 */ 1661 if (V_ip6_mcast_pmtu) 1662 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1663 else { 1664#ifdef MRT6DEBUG 1665 if (V_mrt6debug & DEBUG_XMIT) { 1666 char ip6bufs[INET6_ADDRSTRLEN]; 1667 char ip6bufd[INET6_ADDRSTRLEN]; 1668 log(LOG_DEBUG, 1669 "phyint_send: packet too big on %s o %s " 1670 "g %s size %d(discarded)\n", 1671 if_name(ifp), 1672 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1673 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1674 mb_copy->m_pkthdr.len); 1675 } 1676#endif /* MRT6DEBUG */ 1677 m_freem(mb_copy); /* simply discard the packet */ 1678 } 1679 } 1680} 1681 1682static int 1683register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1684{ 1685 struct mbuf *mm; 1686 int i, len = m->m_pkthdr.len; 1687 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1688 struct mrt6msg *im6; 1689 1690#ifdef MRT6DEBUG 1691 if (V_mrt6debug) { 1692 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1693 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1694 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1695 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1696 } 1697#endif 1698 ++pim6stat.pim6s_snd_registers; 1699 1700 /* Make a copy of the packet to send to the user level process */ 1701 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1702 if (mm == NULL) 1703 return (ENOBUFS); 1704 mm->m_pkthdr.rcvif = NULL; 1705 mm->m_data += max_linkhdr; 1706 mm->m_len = sizeof(struct ip6_hdr); 1707 1708 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1709 m_freem(mm); 1710 return (ENOBUFS); 1711 } 1712 i = MHLEN - M_LEADINGSPACE(mm); 1713 if (i > len) 1714 i = len; 1715 mm = m_pullup(mm, i); 1716 if (mm == NULL) 1717 return (ENOBUFS); 1718/* TODO: check it! */ 1719 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1720 1721 /* 1722 * Send message to routing daemon 1723 */ 1724 sin6.sin6_addr = ip6->ip6_src; 1725 1726 im6 = mtod(mm, struct mrt6msg *); 1727 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1728 im6->im6_mbz = 0; 1729 1730 im6->im6_mif = mif - mif6table; 1731 1732 /* iif info is not given for reg. encap.n */ 1733 mrt6stat.mrt6s_upcalls++; 1734 1735 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1736#ifdef MRT6DEBUG 1737 if (V_mrt6debug) 1738 log(LOG_WARNING, 1739 "register_send: ip6_mrouter socket queue full\n"); 1740#endif 1741 ++mrt6stat.mrt6s_upq_sockfull; 1742 return (ENOBUFS); 1743 } 1744 return (0); 1745} 1746 1747/* 1748 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1749 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1750 * into the kernel. 1751 */ 1752static int 1753pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1754{ 1755 1756#ifdef DIAGNOSTIC 1757 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1758#endif 1759 if (proto != IPPROTO_PIM) 1760 return 0; /* not for us; reject the datagram. */ 1761 1762 return 64; /* claim the datagram. */ 1763} 1764 1765/* 1766 * PIM sparse mode hook 1767 * Receives the pim control messages, and passes them up to the listening 1768 * socket, using rip6_input. 1769 * The only message processed is the REGISTER pim message; the pim header 1770 * is stripped off, and the inner packet is passed to register_mforward. 1771 */ 1772int 1773pim6_input(struct mbuf **mp, int *offp, int proto) 1774{ 1775 struct pim *pim; /* pointer to a pim struct */ 1776 struct ip6_hdr *ip6; 1777 int pimlen; 1778 struct mbuf *m = *mp; 1779 int minlen; 1780 int off = *offp; 1781 1782 ++pim6stat.pim6s_rcv_total; 1783 1784 ip6 = mtod(m, struct ip6_hdr *); 1785 pimlen = m->m_pkthdr.len - *offp; 1786 1787 /* 1788 * Validate lengths 1789 */ 1790 if (pimlen < PIM_MINLEN) { 1791 ++pim6stat.pim6s_rcv_tooshort; 1792#ifdef MRT6DEBUG 1793 if (V_mrt6debug & DEBUG_PIM) 1794 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1795#endif 1796 m_freem(m); 1797 return (IPPROTO_DONE); 1798 } 1799 1800 /* 1801 * if the packet is at least as big as a REGISTER, go ahead 1802 * and grab the PIM REGISTER header size, to avoid another 1803 * possible m_pullup() later. 1804 * 1805 * PIM_MINLEN == pimhdr + u_int32 == 8 1806 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1807 */ 1808 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1809 1810 /* 1811 * Make sure that the IP6 and PIM headers in contiguous memory, and 1812 * possibly the PIM REGISTER header 1813 */ 1814#ifndef PULLDOWN_TEST 1815 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1816 /* adjust pointer */ 1817 ip6 = mtod(m, struct ip6_hdr *); 1818 1819 /* adjust mbuf to point to the PIM header */ 1820 pim = (struct pim *)((caddr_t)ip6 + off); 1821#else 1822 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1823 if (pim == NULL) { 1824 pim6stat.pim6s_rcv_tooshort++; 1825 return (IPPROTO_DONE); 1826 } 1827#endif 1828 1829#define PIM6_CHECKSUM 1830#ifdef PIM6_CHECKSUM 1831 { 1832 int cksumlen; 1833 1834 /* 1835 * Validate checksum. 1836 * If PIM REGISTER, exclude the data packet 1837 */ 1838 if (pim->pim_type == PIM_REGISTER) 1839 cksumlen = PIM_MINLEN; 1840 else 1841 cksumlen = pimlen; 1842 1843 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1844 ++pim6stat.pim6s_rcv_badsum; 1845#ifdef MRT6DEBUG 1846 if (V_mrt6debug & DEBUG_PIM) 1847 log(LOG_DEBUG, 1848 "pim6_input: invalid checksum\n"); 1849#endif 1850 m_freem(m); 1851 return (IPPROTO_DONE); 1852 } 1853 } 1854#endif /* PIM_CHECKSUM */ 1855 1856 /* PIM version check */ 1857 if (pim->pim_ver != PIM_VERSION) { 1858 ++pim6stat.pim6s_rcv_badversion; 1859#ifdef MRT6DEBUG 1860 log(LOG_ERR, 1861 "pim6_input: incorrect version %d, expecting %d\n", 1862 pim->pim_ver, PIM_VERSION); 1863#endif 1864 m_freem(m); 1865 return (IPPROTO_DONE); 1866 } 1867 1868 if (pim->pim_type == PIM_REGISTER) { 1869 /* 1870 * since this is a REGISTER, we'll make a copy of the register 1871 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1872 * routing daemon. 1873 */ 1874 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1875 1876 struct mbuf *mcp; 1877 struct ip6_hdr *eip6; 1878 u_int32_t *reghdr; 1879 int rc; 1880#ifdef MRT6DEBUG 1881 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1882#endif 1883 1884 ++pim6stat.pim6s_rcv_registers; 1885 1886 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1887#ifdef MRT6DEBUG 1888 if (V_mrt6debug & DEBUG_PIM) 1889 log(LOG_DEBUG, 1890 "pim6_input: register mif not set: %d\n", 1891 reg_mif_num); 1892#endif 1893 m_freem(m); 1894 return (IPPROTO_DONE); 1895 } 1896 1897 reghdr = (u_int32_t *)(pim + 1); 1898 1899 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1900 goto pim6_input_to_daemon; 1901 1902 /* 1903 * Validate length 1904 */ 1905 if (pimlen < PIM6_REG_MINLEN) { 1906 ++pim6stat.pim6s_rcv_tooshort; 1907 ++pim6stat.pim6s_rcv_badregisters; 1908#ifdef MRT6DEBUG 1909 log(LOG_ERR, 1910 "pim6_input: register packet size too " 1911 "small %d from %s\n", 1912 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1913#endif 1914 m_freem(m); 1915 return (IPPROTO_DONE); 1916 } 1917 1918 eip6 = (struct ip6_hdr *) (reghdr + 1); 1919#ifdef MRT6DEBUG 1920 if (V_mrt6debug & DEBUG_PIM) 1921 log(LOG_DEBUG, 1922 "pim6_input[register], eip6: %s -> %s, " 1923 "eip6 plen %d\n", 1924 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1925 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1926 ntohs(eip6->ip6_plen)); 1927#endif 1928 1929 /* verify the version number of the inner packet */ 1930 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1931 ++pim6stat.pim6s_rcv_badregisters; 1932#ifdef MRT6DEBUG 1933 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1934 "of the inner packet\n", 1935 (eip6->ip6_vfc & IPV6_VERSION)); 1936#endif 1937 m_freem(m); 1938 return (IPPROTO_NONE); 1939 } 1940 1941 /* verify the inner packet is destined to a mcast group */ 1942 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1943 ++pim6stat.pim6s_rcv_badregisters; 1944#ifdef MRT6DEBUG 1945 if (V_mrt6debug & DEBUG_PIM) 1946 log(LOG_DEBUG, 1947 "pim6_input: inner packet of register " 1948 "is not multicast %s\n", 1949 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1950#endif 1951 m_freem(m); 1952 return (IPPROTO_DONE); 1953 } 1954 1955 /* 1956 * make a copy of the whole header to pass to the daemon later. 1957 */ 1958 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1959 if (mcp == NULL) { 1960#ifdef MRT6DEBUG 1961 log(LOG_ERR, 1962 "pim6_input: pim register: " 1963 "could not copy register head\n"); 1964#endif 1965 m_freem(m); 1966 return (IPPROTO_DONE); 1967 } 1968 1969 /* 1970 * forward the inner ip6 packet; point m_data at the inner ip6. 1971 */ 1972 m_adj(m, off + PIM_MINLEN); 1973#ifdef MRT6DEBUG 1974 if (V_mrt6debug & DEBUG_PIM) { 1975 log(LOG_DEBUG, 1976 "pim6_input: forwarding decapsulated register: " 1977 "src %s, dst %s, mif %d\n", 1978 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1979 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1980 reg_mif_num); 1981 } 1982#endif 1983 1984 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1985 dst.sin6_family, 0); 1986 1987 /* prepare the register head to send to the mrouting daemon */ 1988 m = mcp; 1989 } 1990 1991 /* 1992 * Pass the PIM message up to the daemon; if it is a register message 1993 * pass the 'head' only up to the daemon. This includes the 1994 * encapsulator ip6 header, pim header, register header and the 1995 * encapsulated ip6 header. 1996 */ 1997 pim6_input_to_daemon: 1998 rip6_input(&m, offp, proto); 1999 return (IPPROTO_DONE); 2000} 2001 2002static int 2003ip6_mroute_modevent(module_t mod, int type, void *unused) 2004{ 2005 2006 switch (type) { 2007 case MOD_LOAD: 2008 MROUTER6_LOCK_INIT(); 2009 MFC6_LOCK_INIT(); 2010 MIF6_LOCK_INIT(); 2011 2012 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 2013 pim6_encapcheck, 2014 (const struct protosw *)&in6_pim_protosw, NULL); 2015 if (pim6_encap_cookie == NULL) { 2016 printf("ip6_mroute: unable to attach pim6 encap\n"); 2017 MIF6_LOCK_DESTROY(); 2018 MFC6_LOCK_DESTROY(); 2019 MROUTER6_LOCK_DESTROY(); 2020 return (EINVAL); 2021 } 2022 2023 ip6_mforward = X_ip6_mforward; 2024 ip6_mrouter_done = X_ip6_mrouter_done; 2025 ip6_mrouter_get = X_ip6_mrouter_get; 2026 ip6_mrouter_set = X_ip6_mrouter_set; 2027 mrt6_ioctl = X_mrt6_ioctl; 2028 break; 2029 2030 case MOD_UNLOAD: 2031 if (V_ip6_mrouter != NULL) 2032 return EINVAL; 2033 2034 if (pim6_encap_cookie) { 2035 encap_detach(pim6_encap_cookie); 2036 pim6_encap_cookie = NULL; 2037 } 2038 X_ip6_mrouter_done(); 2039 ip6_mforward = NULL; 2040 ip6_mrouter_done = NULL; 2041 ip6_mrouter_get = NULL; 2042 ip6_mrouter_set = NULL; 2043 mrt6_ioctl = NULL; 2044 2045 MIF6_LOCK_DESTROY(); 2046 MFC6_LOCK_DESTROY(); 2047 MROUTER6_LOCK_DESTROY(); 2048 break; 2049 2050 default: 2051 return (EOPNOTSUPP); 2052 } 2053 2054 return (0); 2055} 2056 2057static moduledata_t ip6_mroutemod = { 2058 "ip6_mroute", 2059 ip6_mroute_modevent, 2060 0 2061}; 2062 2063DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2064