ip6_mroute.c revision 256108
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 256108 2013-10-07 12:07:40Z glebius $"); 83 84#include "opt_inet6.h" 85#include "opt_kdtrace.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/sdt.h> 98#include <sys/signalvar.h> 99#include <sys/socket.h> 100#include <sys/socketvar.h> 101#include <sys/sockio.h> 102#include <sys/sx.h> 103#include <sys/sysctl.h> 104#include <sys/syslog.h> 105#include <sys/systm.h> 106#include <sys/time.h> 107 108#include <net/if.h> 109#include <net/if_types.h> 110#include <net/raw_cb.h> 111#include <net/vnet.h> 112 113#include <netinet/in.h> 114#include <netinet/in_var.h> 115#include <netinet/icmp6.h> 116#include <netinet/ip_encap.h> 117 118#include <netinet/ip6.h> 119#include <netinet/in_kdtrace.h> 120#include <netinet6/ip6_var.h> 121#include <netinet6/scope6_var.h> 122#include <netinet6/nd6.h> 123#include <netinet6/ip6_mroute.h> 124#include <netinet6/ip6protosw.h> 125#include <netinet6/pim6.h> 126#include <netinet6/pim6_var.h> 127 128static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 129 130/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 131#define M_HASCL(m) ((m)->m_flags & M_EXT) 132 133static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 134static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 135static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 136static int set_pim6(int *); 137static int socket_send(struct socket *, struct mbuf *, 138 struct sockaddr_in6 *); 139 140extern int in6_mcast_loop; 141extern struct domain inet6domain; 142 143static const struct encaptab *pim6_encap_cookie; 144static const struct ip6protosw in6_pim_protosw = { 145 .pr_type = SOCK_RAW, 146 .pr_domain = &inet6domain, 147 .pr_protocol = IPPROTO_PIM, 148 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 149 .pr_input = pim6_input, 150 .pr_output = rip6_output, 151 .pr_ctloutput = rip6_ctloutput, 152 .pr_usrreqs = &rip6_usrreqs 153}; 154static int pim6_encapcheck(const struct mbuf *, int, int, void *); 155 156static VNET_DEFINE(int, ip6_mrouter_ver) = 0; 157#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 158 159SYSCTL_DECL(_net_inet6); 160SYSCTL_DECL(_net_inet6_ip6); 161static SYSCTL_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 MRT6STAT_INC(name) mrt6stat.name += 1 169#define NO_RTE_FOUND 0x1 170#define RTE_FOUND 0x2 171 172static struct mtx mrouter6_mtx; 173#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 174#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 175#define MROUTER6_LOCK_ASSERT() do { \ 176 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 177 NET_ASSERT_GIANT(); \ 178} while (0) 179#define MROUTER6_LOCK_INIT() \ 180 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 181#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 182 183static struct mf6c *mf6ctable[MF6CTBLSIZ]; 184SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 185 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 186 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 187 "netinet6/ip6_mroute.h)"); 188 189static struct mtx mfc6_mtx; 190#define MFC6_LOCK() mtx_lock(&mfc6_mtx) 191#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 192#define MFC6_LOCK_ASSERT() do { \ 193 mtx_assert(&mfc6_mtx, MA_OWNED); \ 194 NET_ASSERT_GIANT(); \ 195} while (0) 196#define MFC6_LOCK_INIT() \ 197 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 198#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 199 200static u_char n6expire[MF6CTBLSIZ]; 201 202static struct mif6 mif6table[MAXMIFS]; 203SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 204 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]", 205 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)"); 206 207static struct mtx mif6_mtx; 208#define MIF6_LOCK() mtx_lock(&mif6_mtx) 209#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 210#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 211#define MIF6_LOCK_INIT() \ 212 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 213#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 214 215#ifdef MRT6DEBUG 216static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */ 217#define V_mrt6debug VNET(mrt6debug) 218#define DEBUG_MFC 0x02 219#define DEBUG_FORWARD 0x04 220#define DEBUG_EXPIRE 0x08 221#define DEBUG_XMIT 0x10 222#define DEBUG_REG 0x20 223#define DEBUG_PIM 0x40 224#endif 225 226static void expire_upcalls(void *); 227#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 228#define UPCALL_EXPIRE 6 /* number of timeouts */ 229 230/* 231 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 232 */ 233 234/* 235 * 'Interfaces' associated with decapsulator (so we can tell 236 * packets that went through it from ones that get reflected 237 * by a broken gateway). Different from IPv4 register_if, 238 * these interfaces are linked into the system ifnet list, 239 * because per-interface IPv6 statistics are maintained in 240 * ifp->if_afdata. But it does not have any routes point 241 * to them. I.e., packets can't be sent this way. They 242 * only exist as a placeholder for multicast source 243 * verification. 244 */ 245static struct ifnet *multicast_register_if6; 246 247#define ENCAP_HOPS 64 248 249/* 250 * Private variables. 251 */ 252static mifi_t nummifs = 0; 253static mifi_t reg_mif_num = (mifi_t)-1; 254 255static struct pim6stat pim6stat; 256SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 257 &pim6stat, pim6stat, 258 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 259 260#define PIM6STAT_INC(name) pim6stat.name += 1 261static VNET_DEFINE(int, pim6); 262#define V_pim6 VNET(pim6) 263 264/* 265 * Hash function for a source, group entry 266 */ 267#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 268 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 269 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 270 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 271 272/* 273 * Find a route for a given origin IPv6 address and Multicast group address. 274 */ 275#define MF6CFIND(o, g, rt) do { \ 276 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 277 rt = NULL; \ 278 MRT6STAT_INC(mrt6s_mfc_lookups); \ 279 while (_rt) { \ 280 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 281 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 282 (_rt->mf6c_stall == NULL)) { \ 283 rt = _rt; \ 284 break; \ 285 } \ 286 _rt = _rt->mf6c_next; \ 287 } \ 288 if (rt == NULL) { \ 289 MRT6STAT_INC(mrt6s_mfc_misses); \ 290 } \ 291} while (/*CONSTCOND*/ 0) 292 293/* 294 * Macros to compute elapsed time efficiently 295 * Borrowed from Van Jacobson's scheduling code 296 * XXX: replace with timersub() ? 297 */ 298#define TV_DELTA(a, b, delta) do { \ 299 int xxs; \ 300 \ 301 delta = (a).tv_usec - (b).tv_usec; \ 302 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 303 switch (xxs) { \ 304 case 2: \ 305 delta += 1000000; \ 306 /* FALLTHROUGH */ \ 307 case 1: \ 308 delta += 1000000; \ 309 break; \ 310 default: \ 311 delta += (1000000 * xxs); \ 312 } \ 313 } \ 314} while (/*CONSTCOND*/ 0) 315 316/* XXX: replace with timercmp(a, b, <) ? */ 317#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 318 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 319 320#ifdef UPCALL_TIMING 321#define UPCALL_MAX 50 322static u_long upcall_data[UPCALL_MAX + 1]; 323static void collate(); 324#endif /* UPCALL_TIMING */ 325 326static int ip6_mrouter_init(struct socket *, int, int); 327static int add_m6fc(struct mf6cctl *); 328static int add_m6if(struct mif6ctl *); 329static int del_m6fc(struct mf6cctl *); 330static int del_m6if(mifi_t *); 331static int del_m6if_locked(mifi_t *); 332static int get_mif6_cnt(struct sioc_mif_req6 *); 333static int get_sg_cnt(struct sioc_sg_req6 *); 334 335static struct callout expire_upcalls_ch; 336 337int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 338int X_ip6_mrouter_done(void); 339int X_ip6_mrouter_set(struct socket *, struct sockopt *); 340int X_ip6_mrouter_get(struct socket *, struct sockopt *); 341int X_mrt6_ioctl(u_long, caddr_t); 342 343/* 344 * Handle MRT setsockopt commands to modify the multicast routing tables. 345 */ 346int 347X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 348{ 349 int error = 0; 350 int optval; 351 struct mif6ctl mifc; 352 struct mf6cctl mfcc; 353 mifi_t mifi; 354 355 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 356 return (EACCES); 357 358 switch (sopt->sopt_name) { 359 case MRT6_INIT: 360#ifdef MRT6_OINIT 361 case MRT6_OINIT: 362#endif 363 error = sooptcopyin(sopt, &optval, sizeof(optval), 364 sizeof(optval)); 365 if (error) 366 break; 367 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 368 break; 369 case MRT6_DONE: 370 error = X_ip6_mrouter_done(); 371 break; 372 case MRT6_ADD_MIF: 373 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 374 if (error) 375 break; 376 error = add_m6if(&mifc); 377 break; 378 case MRT6_ADD_MFC: 379 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 380 if (error) 381 break; 382 error = add_m6fc(&mfcc); 383 break; 384 case MRT6_DEL_MFC: 385 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 386 if (error) 387 break; 388 error = del_m6fc(&mfcc); 389 break; 390 case MRT6_DEL_MIF: 391 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 392 if (error) 393 break; 394 error = del_m6if(&mifi); 395 break; 396 case MRT6_PIM: 397 error = sooptcopyin(sopt, &optval, sizeof(optval), 398 sizeof(optval)); 399 if (error) 400 break; 401 error = set_pim6(&optval); 402 break; 403 default: 404 error = EOPNOTSUPP; 405 break; 406 } 407 408 return (error); 409} 410 411/* 412 * Handle MRT getsockopt commands 413 */ 414int 415X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 416{ 417 int error = 0; 418 419 if (so != V_ip6_mrouter) 420 return (EACCES); 421 422 switch (sopt->sopt_name) { 423 case MRT6_PIM: 424 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 425 break; 426 } 427 return (error); 428} 429 430/* 431 * Handle ioctl commands to obtain information from the cache 432 */ 433int 434X_mrt6_ioctl(u_long cmd, caddr_t data) 435{ 436 int ret; 437 438 ret = EINVAL; 439 440 switch (cmd) { 441 case SIOCGETSGCNT_IN6: 442 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 443 break; 444 445 case SIOCGETMIFCNT_IN6: 446 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 447 break; 448 449 default: 450 break; 451 } 452 453 return (ret); 454} 455 456/* 457 * returns the packet, byte, rpf-failure count for the source group provided 458 */ 459static int 460get_sg_cnt(struct sioc_sg_req6 *req) 461{ 462 struct mf6c *rt; 463 int ret; 464 465 ret = 0; 466 467 MFC6_LOCK(); 468 469 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 470 if (rt == NULL) { 471 ret = ESRCH; 472 } else { 473 req->pktcnt = rt->mf6c_pkt_cnt; 474 req->bytecnt = rt->mf6c_byte_cnt; 475 req->wrong_if = rt->mf6c_wrong_if; 476 } 477 478 MFC6_UNLOCK(); 479 480 return (ret); 481} 482 483/* 484 * returns the input and output packet and byte counts on the mif provided 485 */ 486static int 487get_mif6_cnt(struct sioc_mif_req6 *req) 488{ 489 mifi_t mifi; 490 int ret; 491 492 ret = 0; 493 mifi = req->mifi; 494 495 MIF6_LOCK(); 496 497 if (mifi >= nummifs) { 498 ret = EINVAL; 499 } else { 500 req->icount = mif6table[mifi].m6_pkt_in; 501 req->ocount = mif6table[mifi].m6_pkt_out; 502 req->ibytes = mif6table[mifi].m6_bytes_in; 503 req->obytes = mif6table[mifi].m6_bytes_out; 504 } 505 506 MIF6_UNLOCK(); 507 508 return (ret); 509} 510 511static int 512set_pim6(int *i) 513{ 514 if ((*i != 1) && (*i != 0)) 515 return (EINVAL); 516 517 V_pim6 = *i; 518 519 return (0); 520} 521 522/* 523 * Enable multicast routing 524 */ 525static int 526ip6_mrouter_init(struct socket *so, int v, int cmd) 527{ 528 529#ifdef MRT6DEBUG 530 if (V_mrt6debug) 531 log(LOG_DEBUG, 532 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 533 so->so_type, so->so_proto->pr_protocol); 534#endif 535 536 if (so->so_type != SOCK_RAW || 537 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 538 return (EOPNOTSUPP); 539 540 if (v != 1) 541 return (ENOPROTOOPT); 542 543 MROUTER6_LOCK(); 544 545 if (V_ip6_mrouter != NULL) { 546 MROUTER6_UNLOCK(); 547 return (EADDRINUSE); 548 } 549 550 V_ip6_mrouter = so; 551 V_ip6_mrouter_ver = cmd; 552 553 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 554 bzero((caddr_t)n6expire, sizeof(n6expire)); 555 556 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 557 558 callout_init(&expire_upcalls_ch, 0); 559 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 560 expire_upcalls, NULL); 561 562 MROUTER6_UNLOCK(); 563 564#ifdef MRT6DEBUG 565 if (V_mrt6debug) 566 log(LOG_DEBUG, "ip6_mrouter_init\n"); 567#endif 568 569 return (0); 570} 571 572/* 573 * Disable IPv6 multicast forwarding. 574 */ 575int 576X_ip6_mrouter_done(void) 577{ 578 mifi_t mifi; 579 u_long i; 580 struct mf6c *rt; 581 struct rtdetq *rte; 582 583 MROUTER6_LOCK(); 584 585 if (V_ip6_mrouter == NULL) { 586 MROUTER6_UNLOCK(); 587 return (EINVAL); 588 } 589 590 /* 591 * For each phyint in use, disable promiscuous reception of all IPv6 592 * multicasts. 593 */ 594 for (mifi = 0; mifi < nummifs; mifi++) { 595 if (mif6table[mifi].m6_ifp && 596 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 597 if_allmulti(mif6table[mifi].m6_ifp, 0); 598 } 599 } 600 bzero((caddr_t)mif6table, sizeof(mif6table)); 601 nummifs = 0; 602 603 V_pim6 = 0; /* used to stub out/in pim specific code */ 604 605 callout_stop(&expire_upcalls_ch); 606 607 /* 608 * Free all multicast forwarding cache entries. 609 */ 610 MFC6_LOCK(); 611 for (i = 0; i < MF6CTBLSIZ; i++) { 612 rt = mf6ctable[i]; 613 while (rt) { 614 struct mf6c *frt; 615 616 for (rte = rt->mf6c_stall; rte != NULL; ) { 617 struct rtdetq *n = rte->next; 618 619 m_freem(rte->m); 620 free(rte, M_MRTABLE6); 621 rte = n; 622 } 623 frt = rt; 624 rt = rt->mf6c_next; 625 free(frt, M_MRTABLE6); 626 } 627 } 628 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 629 MFC6_UNLOCK(); 630 631 /* 632 * Reset register interface 633 */ 634 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 635 if_detach(multicast_register_if6); 636 if_free(multicast_register_if6); 637 reg_mif_num = (mifi_t)-1; 638 multicast_register_if6 = NULL; 639 } 640 641 V_ip6_mrouter = NULL; 642 V_ip6_mrouter_ver = 0; 643 644 MROUTER6_UNLOCK(); 645 646#ifdef MRT6DEBUG 647 if (V_mrt6debug) 648 log(LOG_DEBUG, "ip6_mrouter_done\n"); 649#endif 650 651 return (0); 652} 653 654static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 655 656/* 657 * Add a mif to the mif table 658 */ 659static int 660add_m6if(struct mif6ctl *mifcp) 661{ 662 struct mif6 *mifp; 663 struct ifnet *ifp; 664 int error; 665 666 MIF6_LOCK(); 667 668 if (mifcp->mif6c_mifi >= MAXMIFS) { 669 MIF6_UNLOCK(); 670 return (EINVAL); 671 } 672 mifp = mif6table + mifcp->mif6c_mifi; 673 if (mifp->m6_ifp != NULL) { 674 MIF6_UNLOCK(); 675 return (EADDRINUSE); /* XXX: is it appropriate? */ 676 } 677 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 678 MIF6_UNLOCK(); 679 return (ENXIO); 680 } 681 682 ifp = ifnet_byindex(mifcp->mif6c_pifi); 683 684 if (mifcp->mif6c_flags & MIFF_REGISTER) { 685 if (reg_mif_num == (mifi_t)-1) { 686 ifp = if_alloc(IFT_OTHER); 687 688 if_initname(ifp, "register_mif", 0); 689 ifp->if_flags |= IFF_LOOPBACK; 690 if_attach(ifp); 691 multicast_register_if6 = ifp; 692 reg_mif_num = mifcp->mif6c_mifi; 693 /* 694 * it is impossible to guess the ifindex of the 695 * register interface. So mif6c_pifi is automatically 696 * calculated. 697 */ 698 mifcp->mif6c_pifi = ifp->if_index; 699 } else { 700 ifp = multicast_register_if6; 701 } 702 } else { 703 /* Make sure the interface supports multicast */ 704 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 705 MIF6_UNLOCK(); 706 return (EOPNOTSUPP); 707 } 708 709 error = if_allmulti(ifp, 1); 710 if (error) { 711 MIF6_UNLOCK(); 712 return (error); 713 } 714 } 715 716 mifp->m6_flags = mifcp->mif6c_flags; 717 mifp->m6_ifp = ifp; 718 719 /* initialize per mif pkt counters */ 720 mifp->m6_pkt_in = 0; 721 mifp->m6_pkt_out = 0; 722 mifp->m6_bytes_in = 0; 723 mifp->m6_bytes_out = 0; 724 725 /* Adjust nummifs up if the mifi is higher than nummifs */ 726 if (nummifs <= mifcp->mif6c_mifi) 727 nummifs = mifcp->mif6c_mifi + 1; 728 729 MIF6_UNLOCK(); 730 731#ifdef MRT6DEBUG 732 if (V_mrt6debug) 733 log(LOG_DEBUG, 734 "add_mif #%d, phyint %s\n", 735 mifcp->mif6c_mifi, 736 ifp->if_xname); 737#endif 738 739 return (0); 740} 741 742/* 743 * Delete a mif from the mif table 744 */ 745static int 746del_m6if_locked(mifi_t *mifip) 747{ 748 struct mif6 *mifp = mif6table + *mifip; 749 mifi_t mifi; 750 struct ifnet *ifp; 751 752 MIF6_LOCK_ASSERT(); 753 754 if (*mifip >= nummifs) 755 return (EINVAL); 756 if (mifp->m6_ifp == NULL) 757 return (EINVAL); 758 759 if (!(mifp->m6_flags & MIFF_REGISTER)) { 760 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 761 ifp = mifp->m6_ifp; 762 if_allmulti(ifp, 0); 763 } else { 764 if (reg_mif_num != (mifi_t)-1 && 765 multicast_register_if6 != NULL) { 766 if_detach(multicast_register_if6); 767 if_free(multicast_register_if6); 768 reg_mif_num = (mifi_t)-1; 769 multicast_register_if6 = NULL; 770 } 771 } 772 773 bzero((caddr_t)mifp, sizeof(*mifp)); 774 775 /* Adjust nummifs down */ 776 for (mifi = nummifs; mifi > 0; mifi--) 777 if (mif6table[mifi - 1].m6_ifp) 778 break; 779 nummifs = mifi; 780 781#ifdef MRT6DEBUG 782 if (V_mrt6debug) 783 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 784#endif 785 786 return (0); 787} 788 789static int 790del_m6if(mifi_t *mifip) 791{ 792 int cc; 793 794 MIF6_LOCK(); 795 cc = del_m6if_locked(mifip); 796 MIF6_UNLOCK(); 797 798 return (cc); 799} 800 801/* 802 * Add an mfc entry 803 */ 804static int 805add_m6fc(struct mf6cctl *mfccp) 806{ 807 struct mf6c *rt; 808 u_long hash; 809 struct rtdetq *rte; 810 u_short nstl; 811 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 812 813 MFC6_LOCK(); 814 815 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 816 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 817 818 /* If an entry already exists, just update the fields */ 819 if (rt) { 820#ifdef MRT6DEBUG 821 if (V_mrt6debug & DEBUG_MFC) { 822 log(LOG_DEBUG, 823 "add_m6fc no upcall h %d o %s g %s p %x\n", 824 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 825 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 826 mfccp->mf6cc_parent); 827 } 828#endif 829 830 rt->mf6c_parent = mfccp->mf6cc_parent; 831 rt->mf6c_ifset = mfccp->mf6cc_ifset; 832 833 MFC6_UNLOCK(); 834 return (0); 835 } 836 837 /* 838 * Find the entry for which the upcall was made and update 839 */ 840 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 841 mfccp->mf6cc_mcastgrp.sin6_addr); 842 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 843 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 844 &mfccp->mf6cc_origin.sin6_addr) && 845 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 846 &mfccp->mf6cc_mcastgrp.sin6_addr) && 847 (rt->mf6c_stall != NULL)) { 848 849 if (nstl++) 850 log(LOG_ERR, 851 "add_m6fc: %s o %s g %s p %x dbx %p\n", 852 "multiple kernel entries", 853 ip6_sprintf(ip6bufo, 854 &mfccp->mf6cc_origin.sin6_addr), 855 ip6_sprintf(ip6bufg, 856 &mfccp->mf6cc_mcastgrp.sin6_addr), 857 mfccp->mf6cc_parent, rt->mf6c_stall); 858 859#ifdef MRT6DEBUG 860 if (V_mrt6debug & DEBUG_MFC) 861 log(LOG_DEBUG, 862 "add_m6fc o %s g %s p %x dbg %x\n", 863 ip6_sprintf(ip6bufo, 864 &mfccp->mf6cc_origin.sin6_addr), 865 ip6_sprintf(ip6bufg, 866 &mfccp->mf6cc_mcastgrp.sin6_addr), 867 mfccp->mf6cc_parent, rt->mf6c_stall); 868#endif 869 870 rt->mf6c_origin = mfccp->mf6cc_origin; 871 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 872 rt->mf6c_parent = mfccp->mf6cc_parent; 873 rt->mf6c_ifset = mfccp->mf6cc_ifset; 874 /* initialize pkt counters per src-grp */ 875 rt->mf6c_pkt_cnt = 0; 876 rt->mf6c_byte_cnt = 0; 877 rt->mf6c_wrong_if = 0; 878 879 rt->mf6c_expire = 0; /* Don't clean this guy up */ 880 n6expire[hash]--; 881 882 /* free packets Qed at the end of this entry */ 883 for (rte = rt->mf6c_stall; rte != NULL; ) { 884 struct rtdetq *n = rte->next; 885 ip6_mdq(rte->m, rte->ifp, rt); 886 m_freem(rte->m); 887#ifdef UPCALL_TIMING 888 collate(&(rte->t)); 889#endif /* UPCALL_TIMING */ 890 free(rte, M_MRTABLE6); 891 rte = n; 892 } 893 rt->mf6c_stall = NULL; 894 } 895 } 896 897 /* 898 * It is possible that an entry is being inserted without an upcall 899 */ 900 if (nstl == 0) { 901#ifdef MRT6DEBUG 902 if (V_mrt6debug & DEBUG_MFC) 903 log(LOG_DEBUG, 904 "add_mfc no upcall h %d o %s g %s p %x\n", 905 hash, 906 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 907 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 908 mfccp->mf6cc_parent); 909#endif 910 911 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 912 913 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 914 &mfccp->mf6cc_origin.sin6_addr)&& 915 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 916 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 917 918 rt->mf6c_origin = mfccp->mf6cc_origin; 919 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 920 rt->mf6c_parent = mfccp->mf6cc_parent; 921 rt->mf6c_ifset = mfccp->mf6cc_ifset; 922 /* initialize pkt counters per src-grp */ 923 rt->mf6c_pkt_cnt = 0; 924 rt->mf6c_byte_cnt = 0; 925 rt->mf6c_wrong_if = 0; 926 927 if (rt->mf6c_expire) 928 n6expire[hash]--; 929 rt->mf6c_expire = 0; 930 } 931 } 932 if (rt == NULL) { 933 /* no upcall, so make a new entry */ 934 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 935 M_NOWAIT); 936 if (rt == NULL) { 937 MFC6_UNLOCK(); 938 return (ENOBUFS); 939 } 940 941 /* insert new entry at head of hash chain */ 942 rt->mf6c_origin = mfccp->mf6cc_origin; 943 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 944 rt->mf6c_parent = mfccp->mf6cc_parent; 945 rt->mf6c_ifset = mfccp->mf6cc_ifset; 946 /* initialize pkt counters per src-grp */ 947 rt->mf6c_pkt_cnt = 0; 948 rt->mf6c_byte_cnt = 0; 949 rt->mf6c_wrong_if = 0; 950 rt->mf6c_expire = 0; 951 rt->mf6c_stall = NULL; 952 953 /* link into table */ 954 rt->mf6c_next = mf6ctable[hash]; 955 mf6ctable[hash] = rt; 956 } 957 } 958 959 MFC6_UNLOCK(); 960 return (0); 961} 962 963#ifdef UPCALL_TIMING 964/* 965 * collect delay statistics on the upcalls 966 */ 967static void 968collate(struct timeval *t) 969{ 970 u_long d; 971 struct timeval tp; 972 u_long delta; 973 974 GET_TIME(tp); 975 976 if (TV_LT(*t, tp)) 977 { 978 TV_DELTA(tp, *t, delta); 979 980 d = delta >> 10; 981 if (d > UPCALL_MAX) 982 d = UPCALL_MAX; 983 984 ++upcall_data[d]; 985 } 986} 987#endif /* UPCALL_TIMING */ 988 989/* 990 * Delete an mfc entry 991 */ 992static int 993del_m6fc(struct mf6cctl *mfccp) 994{ 995 struct sockaddr_in6 origin; 996 struct sockaddr_in6 mcastgrp; 997 struct mf6c *rt; 998 struct mf6c **nptr; 999 u_long hash; 1000 1001 origin = mfccp->mf6cc_origin; 1002 mcastgrp = mfccp->mf6cc_mcastgrp; 1003 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1004 1005#ifdef MRT6DEBUG 1006 if (V_mrt6debug & DEBUG_MFC) { 1007 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1008 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 1009 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1010 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1011 } 1012#endif 1013 1014 MFC6_LOCK(); 1015 1016 nptr = &mf6ctable[hash]; 1017 while ((rt = *nptr) != NULL) { 1018 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1019 &rt->mf6c_origin.sin6_addr) && 1020 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1021 &rt->mf6c_mcastgrp.sin6_addr) && 1022 rt->mf6c_stall == NULL) 1023 break; 1024 1025 nptr = &rt->mf6c_next; 1026 } 1027 if (rt == NULL) { 1028 MFC6_UNLOCK(); 1029 return (EADDRNOTAVAIL); 1030 } 1031 1032 *nptr = rt->mf6c_next; 1033 free(rt, M_MRTABLE6); 1034 1035 MFC6_UNLOCK(); 1036 1037 return (0); 1038} 1039 1040static int 1041socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1042{ 1043 1044 if (s) { 1045 if (sbappendaddr(&s->so_rcv, 1046 (struct sockaddr *)src, 1047 mm, (struct mbuf *)0) != 0) { 1048 sorwakeup(s); 1049 return (0); 1050 } 1051 } 1052 m_freem(mm); 1053 return (-1); 1054} 1055 1056/* 1057 * IPv6 multicast forwarding function. This function assumes that the packet 1058 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1059 * pointed to by "ifp", and the packet is to be relayed to other networks 1060 * that have members of the packet's destination IPv6 multicast group. 1061 * 1062 * The packet is returned unscathed to the caller, unless it is 1063 * erroneous, in which case a non-zero return value tells the caller to 1064 * discard it. 1065 * 1066 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1067 * this function is called in the originating context (i.e., not when 1068 * forwarding a packet from other node). ip6_output(), which is currently the 1069 * only function that calls this function is called in the originating context, 1070 * explicitly ensures this condition. It is caller's responsibility to ensure 1071 * that if this function is called from somewhere else in the originating 1072 * context in the future. 1073 */ 1074int 1075X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1076{ 1077 struct mf6c *rt; 1078 struct mif6 *mifp; 1079 struct mbuf *mm; 1080 mifi_t mifi; 1081 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1082 1083#ifdef MRT6DEBUG 1084 if (V_mrt6debug & DEBUG_FORWARD) 1085 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1086 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1087 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1088 ifp->if_index); 1089#endif 1090 1091 /* 1092 * Don't forward a packet with Hop limit of zero or one, 1093 * or a packet destined to a local-only group. 1094 */ 1095 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1096 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1097 return (0); 1098 ip6->ip6_hlim--; 1099 1100 /* 1101 * Source address check: do not forward packets with unspecified 1102 * source. It was discussed in July 2000, on ipngwg mailing list. 1103 * This is rather more serious than unicast cases, because some 1104 * MLD packets can be sent with the unspecified source address 1105 * (although such packets must normally set 1 to the hop limit field). 1106 */ 1107 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1108 IP6STAT_INC(ip6s_cantforward); 1109 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1110 V_ip6_log_time = time_uptime; 1111 log(LOG_DEBUG, 1112 "cannot forward " 1113 "from %s to %s nxt %d received on %s\n", 1114 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1115 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1116 ip6->ip6_nxt, 1117 if_name(m->m_pkthdr.rcvif)); 1118 } 1119 return (0); 1120 } 1121 1122 MFC6_LOCK(); 1123 1124 /* 1125 * Determine forwarding mifs from the forwarding cache table 1126 */ 1127 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1128 1129 /* Entry exists, so forward if necessary */ 1130 if (rt) { 1131 MFC6_UNLOCK(); 1132 return (ip6_mdq(m, ifp, rt)); 1133 } else { 1134 /* 1135 * If we don't have a route for packet's origin, 1136 * Make a copy of the packet & 1137 * send message to routing daemon 1138 */ 1139 1140 struct mbuf *mb0; 1141 struct rtdetq *rte; 1142 u_long hash; 1143/* int i, npkts;*/ 1144#ifdef UPCALL_TIMING 1145 struct timeval tp; 1146 1147 GET_TIME(tp); 1148#endif /* UPCALL_TIMING */ 1149 1150 MRT6STAT_INC(mrt6s_no_route); 1151#ifdef MRT6DEBUG 1152 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1153 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1154 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1155 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1156#endif 1157 1158 /* 1159 * Allocate mbufs early so that we don't do extra work if we 1160 * are just going to fail anyway. 1161 */ 1162 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1163 M_NOWAIT); 1164 if (rte == NULL) { 1165 MFC6_UNLOCK(); 1166 return (ENOBUFS); 1167 } 1168 mb0 = m_copy(m, 0, M_COPYALL); 1169 /* 1170 * Pullup packet header if needed before storing it, 1171 * as other references may modify it in the meantime. 1172 */ 1173 if (mb0 && 1174 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1175 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1176 if (mb0 == NULL) { 1177 free(rte, M_MRTABLE6); 1178 MFC6_UNLOCK(); 1179 return (ENOBUFS); 1180 } 1181 1182 /* is there an upcall waiting for this packet? */ 1183 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1184 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1185 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1186 &rt->mf6c_origin.sin6_addr) && 1187 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1188 &rt->mf6c_mcastgrp.sin6_addr) && 1189 (rt->mf6c_stall != NULL)) 1190 break; 1191 } 1192 1193 if (rt == NULL) { 1194 struct mrt6msg *im; 1195#ifdef MRT6_OINIT 1196 struct omrt6msg *oim; 1197#endif 1198 1199 /* no upcall, so make a new entry */ 1200 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1201 M_NOWAIT); 1202 if (rt == NULL) { 1203 free(rte, M_MRTABLE6); 1204 m_freem(mb0); 1205 MFC6_UNLOCK(); 1206 return (ENOBUFS); 1207 } 1208 /* 1209 * Make a copy of the header to send to the user 1210 * level process 1211 */ 1212 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1213 1214 if (mm == NULL) { 1215 free(rte, M_MRTABLE6); 1216 m_freem(mb0); 1217 free(rt, M_MRTABLE6); 1218 MFC6_UNLOCK(); 1219 return (ENOBUFS); 1220 } 1221 1222 /* 1223 * Send message to routing daemon 1224 */ 1225 sin6.sin6_addr = ip6->ip6_src; 1226 1227 im = NULL; 1228#ifdef MRT6_OINIT 1229 oim = NULL; 1230#endif 1231 switch (V_ip6_mrouter_ver) { 1232#ifdef MRT6_OINIT 1233 case MRT6_OINIT: 1234 oim = mtod(mm, struct omrt6msg *); 1235 oim->im6_msgtype = MRT6MSG_NOCACHE; 1236 oim->im6_mbz = 0; 1237 break; 1238#endif 1239 case MRT6_INIT: 1240 im = mtod(mm, struct mrt6msg *); 1241 im->im6_msgtype = MRT6MSG_NOCACHE; 1242 im->im6_mbz = 0; 1243 break; 1244 default: 1245 free(rte, M_MRTABLE6); 1246 m_freem(mb0); 1247 free(rt, M_MRTABLE6); 1248 MFC6_UNLOCK(); 1249 return (EINVAL); 1250 } 1251 1252#ifdef MRT6DEBUG 1253 if (V_mrt6debug & DEBUG_FORWARD) 1254 log(LOG_DEBUG, 1255 "getting the iif info in the kernel\n"); 1256#endif 1257 1258 for (mifp = mif6table, mifi = 0; 1259 mifi < nummifs && mifp->m6_ifp != ifp; 1260 mifp++, mifi++) 1261 ; 1262 1263 switch (V_ip6_mrouter_ver) { 1264#ifdef MRT6_OINIT 1265 case MRT6_OINIT: 1266 oim->im6_mif = mifi; 1267 break; 1268#endif 1269 case MRT6_INIT: 1270 im->im6_mif = mifi; 1271 break; 1272 } 1273 1274 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1275 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1276 "socket queue full\n"); 1277 MRT6STAT_INC(mrt6s_upq_sockfull); 1278 free(rte, M_MRTABLE6); 1279 m_freem(mb0); 1280 free(rt, M_MRTABLE6); 1281 MFC6_UNLOCK(); 1282 return (ENOBUFS); 1283 } 1284 1285 MRT6STAT_INC(mrt6s_upcalls); 1286 1287 /* insert new entry at head of hash chain */ 1288 bzero(rt, sizeof(*rt)); 1289 rt->mf6c_origin.sin6_family = AF_INET6; 1290 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1291 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1292 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1293 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1294 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1295 rt->mf6c_expire = UPCALL_EXPIRE; 1296 n6expire[hash]++; 1297 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1298 1299 /* link into table */ 1300 rt->mf6c_next = mf6ctable[hash]; 1301 mf6ctable[hash] = rt; 1302 /* Add this entry to the end of the queue */ 1303 rt->mf6c_stall = rte; 1304 } else { 1305 /* determine if q has overflowed */ 1306 struct rtdetq **p; 1307 int npkts = 0; 1308 1309 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1310 if (++npkts > MAX_UPQ6) { 1311 MRT6STAT_INC(mrt6s_upq_ovflw); 1312 free(rte, M_MRTABLE6); 1313 m_freem(mb0); 1314 MFC6_UNLOCK(); 1315 return (0); 1316 } 1317 1318 /* Add this entry to the end of the queue */ 1319 *p = rte; 1320 } 1321 1322 rte->next = NULL; 1323 rte->m = mb0; 1324 rte->ifp = ifp; 1325#ifdef UPCALL_TIMING 1326 rte->t = tp; 1327#endif /* UPCALL_TIMING */ 1328 1329 MFC6_UNLOCK(); 1330 1331 return (0); 1332 } 1333} 1334 1335/* 1336 * Clean up cache entries if upcalls are not serviced 1337 * Call from the Slow Timeout mechanism, every half second. 1338 */ 1339static void 1340expire_upcalls(void *unused) 1341{ 1342 struct rtdetq *rte; 1343 struct mf6c *mfc, **nptr; 1344 u_long i; 1345 1346 MFC6_LOCK(); 1347 for (i = 0; i < MF6CTBLSIZ; i++) { 1348 if (n6expire[i] == 0) 1349 continue; 1350 nptr = &mf6ctable[i]; 1351 while ((mfc = *nptr) != NULL) { 1352 rte = mfc->mf6c_stall; 1353 /* 1354 * Skip real cache entries 1355 * Make sure it wasn't marked to not expire (shouldn't happen) 1356 * If it expires now 1357 */ 1358 if (rte != NULL && 1359 mfc->mf6c_expire != 0 && 1360 --mfc->mf6c_expire == 0) { 1361#ifdef MRT6DEBUG 1362 if (V_mrt6debug & DEBUG_EXPIRE) { 1363 char ip6bufo[INET6_ADDRSTRLEN]; 1364 char ip6bufg[INET6_ADDRSTRLEN]; 1365 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1366 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1367 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1368 } 1369#endif 1370 /* 1371 * drop all the packets 1372 * free the mbuf with the pkt, if, timing info 1373 */ 1374 do { 1375 struct rtdetq *n = rte->next; 1376 m_freem(rte->m); 1377 free(rte, M_MRTABLE6); 1378 rte = n; 1379 } while (rte != NULL); 1380 MRT6STAT_INC(mrt6s_cache_cleanups); 1381 n6expire[i]--; 1382 1383 *nptr = mfc->mf6c_next; 1384 free(mfc, M_MRTABLE6); 1385 } else { 1386 nptr = &mfc->mf6c_next; 1387 } 1388 } 1389 } 1390 MFC6_UNLOCK(); 1391 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1392 expire_upcalls, NULL); 1393} 1394 1395/* 1396 * Packet forwarding routine once entry in the cache is made 1397 */ 1398static int 1399ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1400{ 1401 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1402 mifi_t mifi, iif; 1403 struct mif6 *mifp; 1404 int plen = m->m_pkthdr.len; 1405 struct in6_addr src0, dst0; /* copies for local work */ 1406 u_int32_t iszone, idzone, oszone, odzone; 1407 int error = 0; 1408 1409/* 1410 * Macro to send packet on mif. Since RSVP packets don't get counted on 1411 * input, they shouldn't get counted on output, so statistics keeping is 1412 * separate. 1413 */ 1414 1415#define MC6_SEND(ip6, mifp, m) do { \ 1416 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1417 register_send((ip6), (mifp), (m)); \ 1418 else \ 1419 phyint_send((ip6), (mifp), (m)); \ 1420} while (/*CONSTCOND*/ 0) 1421 1422 /* 1423 * Don't forward if it didn't arrive from the parent mif 1424 * for its origin. 1425 */ 1426 mifi = rt->mf6c_parent; 1427 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1428 /* came in the wrong interface */ 1429#ifdef MRT6DEBUG 1430 if (V_mrt6debug & DEBUG_FORWARD) 1431 log(LOG_DEBUG, 1432 "wrong if: ifid %d mifi %d mififid %x\n", 1433 ifp->if_index, mifi, 1434 mif6table[mifi].m6_ifp->if_index); 1435#endif 1436 MRT6STAT_INC(mrt6s_wrong_if); 1437 rt->mf6c_wrong_if++; 1438 /* 1439 * If we are doing PIM processing, and we are forwarding 1440 * packets on this interface, send a message to the 1441 * routing daemon. 1442 */ 1443 /* have to make sure this is a valid mif */ 1444 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1445 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1446 /* 1447 * Check the M_LOOP flag to avoid an 1448 * unnecessary PIM assert. 1449 * XXX: M_LOOP is an ad-hoc hack... 1450 */ 1451 static struct sockaddr_in6 sin6 = 1452 { sizeof(sin6), AF_INET6 }; 1453 1454 struct mbuf *mm; 1455 struct mrt6msg *im; 1456#ifdef MRT6_OINIT 1457 struct omrt6msg *oim; 1458#endif 1459 1460 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1461 if (mm && 1462 (M_HASCL(mm) || 1463 mm->m_len < sizeof(struct ip6_hdr))) 1464 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1465 if (mm == NULL) 1466 return (ENOBUFS); 1467 1468#ifdef MRT6_OINIT 1469 oim = NULL; 1470#endif 1471 im = NULL; 1472 switch (V_ip6_mrouter_ver) { 1473#ifdef MRT6_OINIT 1474 case MRT6_OINIT: 1475 oim = mtod(mm, struct omrt6msg *); 1476 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1477 oim->im6_mbz = 0; 1478 break; 1479#endif 1480 case MRT6_INIT: 1481 im = mtod(mm, struct mrt6msg *); 1482 im->im6_msgtype = MRT6MSG_WRONGMIF; 1483 im->im6_mbz = 0; 1484 break; 1485 default: 1486 m_freem(mm); 1487 return (EINVAL); 1488 } 1489 1490 for (mifp = mif6table, iif = 0; 1491 iif < nummifs && mifp && 1492 mifp->m6_ifp != ifp; 1493 mifp++, iif++) 1494 ; 1495 1496 switch (V_ip6_mrouter_ver) { 1497#ifdef MRT6_OINIT 1498 case MRT6_OINIT: 1499 oim->im6_mif = iif; 1500 sin6.sin6_addr = oim->im6_src; 1501 break; 1502#endif 1503 case MRT6_INIT: 1504 im->im6_mif = iif; 1505 sin6.sin6_addr = im->im6_src; 1506 break; 1507 } 1508 1509 MRT6STAT_INC(mrt6s_upcalls); 1510 1511 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1512#ifdef MRT6DEBUG 1513 if (V_mrt6debug) 1514 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1515#endif 1516 MRT6STAT_INC(mrt6s_upq_sockfull); 1517 return (ENOBUFS); 1518 } /* if socket Q full */ 1519 } /* if PIM */ 1520 return (0); 1521 } /* if wrong iif */ 1522 1523 /* If I sourced this packet, it counts as output, else it was input. */ 1524 if (m->m_pkthdr.rcvif == NULL) { 1525 /* XXX: is rcvif really NULL when output?? */ 1526 mif6table[mifi].m6_pkt_out++; 1527 mif6table[mifi].m6_bytes_out += plen; 1528 } else { 1529 mif6table[mifi].m6_pkt_in++; 1530 mif6table[mifi].m6_bytes_in += plen; 1531 } 1532 rt->mf6c_pkt_cnt++; 1533 rt->mf6c_byte_cnt += plen; 1534 1535 /* 1536 * For each mif, forward a copy of the packet if there are group 1537 * members downstream on the interface. 1538 */ 1539 src0 = ip6->ip6_src; 1540 dst0 = ip6->ip6_dst; 1541 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1542 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1543 IP6STAT_INC(ip6s_badscope); 1544 return (error); 1545 } 1546 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1547 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1548 /* 1549 * check if the outgoing packet is going to break 1550 * a scope boundary. 1551 * XXX For packets through PIM register tunnel 1552 * interface, we believe a routing daemon. 1553 */ 1554 if (!(mif6table[rt->mf6c_parent].m6_flags & 1555 MIFF_REGISTER) && 1556 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1557 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1558 &oszone) || 1559 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1560 &odzone) || 1561 iszone != oszone || 1562 idzone != odzone) { 1563 IP6STAT_INC(ip6s_badscope); 1564 continue; 1565 } 1566 } 1567 1568 mifp->m6_pkt_out++; 1569 mifp->m6_bytes_out += plen; 1570 MC6_SEND(ip6, mifp, m); 1571 } 1572 } 1573 return (0); 1574} 1575 1576static void 1577phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1578{ 1579 struct mbuf *mb_copy; 1580 struct ifnet *ifp = mifp->m6_ifp; 1581 int error = 0; 1582 u_long linkmtu; 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, NULL, IPV6_FORWARDING, &im6o, 1614 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 struct sockaddr_in6 dst6; 1630 1631 bzero(&dst6, sizeof(dst6)); 1632 dst6.sin6_len = sizeof(struct sockaddr_in6); 1633 dst6.sin6_family = AF_INET6; 1634 dst6.sin6_addr = ip6->ip6_dst; 1635 ip6_mloopback(ifp, m, &dst6); 1636 } 1637 1638 /* 1639 * Put the packet into the sending queue of the outgoing interface 1640 * if it would fit in the MTU of the interface. 1641 */ 1642 linkmtu = IN6_LINKMTU(ifp); 1643 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1644 struct sockaddr_in6 dst6; 1645 1646 bzero(&dst6, sizeof(dst6)); 1647 dst6.sin6_len = sizeof(struct sockaddr_in6); 1648 dst6.sin6_family = AF_INET6; 1649 dst6.sin6_addr = ip6->ip6_dst; 1650 1651 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1652 /* 1653 * We just call if_output instead of nd6_output here, since 1654 * we need no ND for a multicast forwarded packet...right? 1655 */ 1656 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1657 error = (*ifp->if_output)(ifp, mb_copy, 1658 (struct sockaddr *)&dst6, NULL); 1659#ifdef MRT6DEBUG 1660 if (V_mrt6debug & DEBUG_XMIT) 1661 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1662 mifp - mif6table, error); 1663#endif 1664 } else { 1665 /* 1666 * pMTU discovery is intentionally disabled by default, since 1667 * various router may notify pMTU in multicast, which can be 1668 * a DDoS to a router 1669 */ 1670 if (V_ip6_mcast_pmtu) 1671 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1672 else { 1673#ifdef MRT6DEBUG 1674 if (V_mrt6debug & DEBUG_XMIT) { 1675 char ip6bufs[INET6_ADDRSTRLEN]; 1676 char ip6bufd[INET6_ADDRSTRLEN]; 1677 log(LOG_DEBUG, 1678 "phyint_send: packet too big on %s o %s " 1679 "g %s size %d(discarded)\n", 1680 if_name(ifp), 1681 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1682 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1683 mb_copy->m_pkthdr.len); 1684 } 1685#endif /* MRT6DEBUG */ 1686 m_freem(mb_copy); /* simply discard the packet */ 1687 } 1688 } 1689} 1690 1691static int 1692register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1693{ 1694 struct mbuf *mm; 1695 int i, len = m->m_pkthdr.len; 1696 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1697 struct mrt6msg *im6; 1698 1699#ifdef MRT6DEBUG 1700 if (V_mrt6debug) { 1701 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1702 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1703 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1704 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1705 } 1706#endif 1707 PIM6STAT_INC(pim6s_snd_registers); 1708 1709 /* Make a copy of the packet to send to the user level process. */ 1710 mm = m_gethdr(M_NOWAIT, MT_DATA); 1711 if (mm == NULL) 1712 return (ENOBUFS); 1713 mm->m_data += max_linkhdr; 1714 mm->m_len = sizeof(struct ip6_hdr); 1715 1716 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1717 m_freem(mm); 1718 return (ENOBUFS); 1719 } 1720 i = MHLEN - M_LEADINGSPACE(mm); 1721 if (i > len) 1722 i = len; 1723 mm = m_pullup(mm, i); 1724 if (mm == NULL) 1725 return (ENOBUFS); 1726/* TODO: check it! */ 1727 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1728 1729 /* 1730 * Send message to routing daemon 1731 */ 1732 sin6.sin6_addr = ip6->ip6_src; 1733 1734 im6 = mtod(mm, struct mrt6msg *); 1735 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1736 im6->im6_mbz = 0; 1737 1738 im6->im6_mif = mif - mif6table; 1739 1740 /* iif info is not given for reg. encap.n */ 1741 MRT6STAT_INC(mrt6s_upcalls); 1742 1743 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1744#ifdef MRT6DEBUG 1745 if (V_mrt6debug) 1746 log(LOG_WARNING, 1747 "register_send: ip6_mrouter socket queue full\n"); 1748#endif 1749 MRT6STAT_INC(mrt6s_upq_sockfull); 1750 return (ENOBUFS); 1751 } 1752 return (0); 1753} 1754 1755/* 1756 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1757 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1758 * into the kernel. 1759 */ 1760static int 1761pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1762{ 1763 1764#ifdef DIAGNOSTIC 1765 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1766#endif 1767 if (proto != IPPROTO_PIM) 1768 return 0; /* not for us; reject the datagram. */ 1769 1770 return 64; /* claim the datagram. */ 1771} 1772 1773/* 1774 * PIM sparse mode hook 1775 * Receives the pim control messages, and passes them up to the listening 1776 * socket, using rip6_input. 1777 * The only message processed is the REGISTER pim message; the pim header 1778 * is stripped off, and the inner packet is passed to register_mforward. 1779 */ 1780int 1781pim6_input(struct mbuf **mp, int *offp, int proto) 1782{ 1783 struct pim *pim; /* pointer to a pim struct */ 1784 struct ip6_hdr *ip6; 1785 int pimlen; 1786 struct mbuf *m = *mp; 1787 int minlen; 1788 int off = *offp; 1789 1790 PIM6STAT_INC(pim6s_rcv_total); 1791 1792 ip6 = mtod(m, struct ip6_hdr *); 1793 pimlen = m->m_pkthdr.len - *offp; 1794 1795 /* 1796 * Validate lengths 1797 */ 1798 if (pimlen < PIM_MINLEN) { 1799 PIM6STAT_INC(pim6s_rcv_tooshort); 1800#ifdef MRT6DEBUG 1801 if (V_mrt6debug & DEBUG_PIM) 1802 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1803#endif 1804 m_freem(m); 1805 return (IPPROTO_DONE); 1806 } 1807 1808 /* 1809 * if the packet is at least as big as a REGISTER, go ahead 1810 * and grab the PIM REGISTER header size, to avoid another 1811 * possible m_pullup() later. 1812 * 1813 * PIM_MINLEN == pimhdr + u_int32 == 8 1814 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1815 */ 1816 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1817 1818 /* 1819 * Make sure that the IP6 and PIM headers in contiguous memory, and 1820 * possibly the PIM REGISTER header 1821 */ 1822#ifndef PULLDOWN_TEST 1823 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1824 /* adjust pointer */ 1825 ip6 = mtod(m, struct ip6_hdr *); 1826 1827 /* adjust mbuf to point to the PIM header */ 1828 pim = (struct pim *)((caddr_t)ip6 + off); 1829#else 1830 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1831 if (pim == NULL) { 1832 PIM6STAT_INC(pim6s_rcv_tooshort); 1833 return (IPPROTO_DONE); 1834 } 1835#endif 1836 1837#define PIM6_CHECKSUM 1838#ifdef PIM6_CHECKSUM 1839 { 1840 int cksumlen; 1841 1842 /* 1843 * Validate checksum. 1844 * If PIM REGISTER, exclude the data packet 1845 */ 1846 if (pim->pim_type == PIM_REGISTER) 1847 cksumlen = PIM_MINLEN; 1848 else 1849 cksumlen = pimlen; 1850 1851 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1852 PIM6STAT_INC(pim6s_rcv_badsum); 1853#ifdef MRT6DEBUG 1854 if (V_mrt6debug & DEBUG_PIM) 1855 log(LOG_DEBUG, 1856 "pim6_input: invalid checksum\n"); 1857#endif 1858 m_freem(m); 1859 return (IPPROTO_DONE); 1860 } 1861 } 1862#endif /* PIM_CHECKSUM */ 1863 1864 /* PIM version check */ 1865 if (pim->pim_ver != PIM_VERSION) { 1866 PIM6STAT_INC(pim6s_rcv_badversion); 1867#ifdef MRT6DEBUG 1868 log(LOG_ERR, 1869 "pim6_input: incorrect version %d, expecting %d\n", 1870 pim->pim_ver, PIM_VERSION); 1871#endif 1872 m_freem(m); 1873 return (IPPROTO_DONE); 1874 } 1875 1876 if (pim->pim_type == PIM_REGISTER) { 1877 /* 1878 * since this is a REGISTER, we'll make a copy of the register 1879 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1880 * routing daemon. 1881 */ 1882 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1883 1884 struct mbuf *mcp; 1885 struct ip6_hdr *eip6; 1886 u_int32_t *reghdr; 1887 int rc; 1888#ifdef MRT6DEBUG 1889 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1890#endif 1891 1892 PIM6STAT_INC(pim6s_rcv_registers); 1893 1894 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1895#ifdef MRT6DEBUG 1896 if (V_mrt6debug & DEBUG_PIM) 1897 log(LOG_DEBUG, 1898 "pim6_input: register mif not set: %d\n", 1899 reg_mif_num); 1900#endif 1901 m_freem(m); 1902 return (IPPROTO_DONE); 1903 } 1904 1905 reghdr = (u_int32_t *)(pim + 1); 1906 1907 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1908 goto pim6_input_to_daemon; 1909 1910 /* 1911 * Validate length 1912 */ 1913 if (pimlen < PIM6_REG_MINLEN) { 1914 PIM6STAT_INC(pim6s_rcv_tooshort); 1915 PIM6STAT_INC(pim6s_rcv_badregisters); 1916#ifdef MRT6DEBUG 1917 log(LOG_ERR, 1918 "pim6_input: register packet size too " 1919 "small %d from %s\n", 1920 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1921#endif 1922 m_freem(m); 1923 return (IPPROTO_DONE); 1924 } 1925 1926 eip6 = (struct ip6_hdr *) (reghdr + 1); 1927#ifdef MRT6DEBUG 1928 if (V_mrt6debug & DEBUG_PIM) 1929 log(LOG_DEBUG, 1930 "pim6_input[register], eip6: %s -> %s, " 1931 "eip6 plen %d\n", 1932 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1933 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1934 ntohs(eip6->ip6_plen)); 1935#endif 1936 1937 /* verify the version number of the inner packet */ 1938 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1939 PIM6STAT_INC(pim6s_rcv_badregisters); 1940#ifdef MRT6DEBUG 1941 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1942 "of the inner packet\n", 1943 (eip6->ip6_vfc & IPV6_VERSION)); 1944#endif 1945 m_freem(m); 1946 return (IPPROTO_NONE); 1947 } 1948 1949 /* verify the inner packet is destined to a mcast group */ 1950 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1951 PIM6STAT_INC(pim6s_rcv_badregisters); 1952#ifdef MRT6DEBUG 1953 if (V_mrt6debug & DEBUG_PIM) 1954 log(LOG_DEBUG, 1955 "pim6_input: inner packet of register " 1956 "is not multicast %s\n", 1957 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1958#endif 1959 m_freem(m); 1960 return (IPPROTO_DONE); 1961 } 1962 1963 /* 1964 * make a copy of the whole header to pass to the daemon later. 1965 */ 1966 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1967 if (mcp == NULL) { 1968#ifdef MRT6DEBUG 1969 log(LOG_ERR, 1970 "pim6_input: pim register: " 1971 "could not copy register head\n"); 1972#endif 1973 m_freem(m); 1974 return (IPPROTO_DONE); 1975 } 1976 1977 /* 1978 * forward the inner ip6 packet; point m_data at the inner ip6. 1979 */ 1980 m_adj(m, off + PIM_MINLEN); 1981#ifdef MRT6DEBUG 1982 if (V_mrt6debug & DEBUG_PIM) { 1983 log(LOG_DEBUG, 1984 "pim6_input: forwarding decapsulated register: " 1985 "src %s, dst %s, mif %d\n", 1986 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1987 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1988 reg_mif_num); 1989 } 1990#endif 1991 1992 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1993 dst.sin6_family, 0); 1994 1995 /* prepare the register head to send to the mrouting daemon */ 1996 m = mcp; 1997 } 1998 1999 /* 2000 * Pass the PIM message up to the daemon; if it is a register message 2001 * pass the 'head' only up to the daemon. This includes the 2002 * encapsulator ip6 header, pim header, register header and the 2003 * encapsulated ip6 header. 2004 */ 2005 pim6_input_to_daemon: 2006 rip6_input(&m, offp, proto); 2007 return (IPPROTO_DONE); 2008} 2009 2010static int 2011ip6_mroute_modevent(module_t mod, int type, void *unused) 2012{ 2013 2014 switch (type) { 2015 case MOD_LOAD: 2016 MROUTER6_LOCK_INIT(); 2017 MFC6_LOCK_INIT(); 2018 MIF6_LOCK_INIT(); 2019 2020 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 2021 pim6_encapcheck, 2022 (const struct protosw *)&in6_pim_protosw, NULL); 2023 if (pim6_encap_cookie == NULL) { 2024 printf("ip6_mroute: unable to attach pim6 encap\n"); 2025 MIF6_LOCK_DESTROY(); 2026 MFC6_LOCK_DESTROY(); 2027 MROUTER6_LOCK_DESTROY(); 2028 return (EINVAL); 2029 } 2030 2031 ip6_mforward = X_ip6_mforward; 2032 ip6_mrouter_done = X_ip6_mrouter_done; 2033 ip6_mrouter_get = X_ip6_mrouter_get; 2034 ip6_mrouter_set = X_ip6_mrouter_set; 2035 mrt6_ioctl = X_mrt6_ioctl; 2036 break; 2037 2038 case MOD_UNLOAD: 2039 if (V_ip6_mrouter != NULL) 2040 return EINVAL; 2041 2042 if (pim6_encap_cookie) { 2043 encap_detach(pim6_encap_cookie); 2044 pim6_encap_cookie = NULL; 2045 } 2046 X_ip6_mrouter_done(); 2047 ip6_mforward = NULL; 2048 ip6_mrouter_done = NULL; 2049 ip6_mrouter_get = NULL; 2050 ip6_mrouter_set = NULL; 2051 mrt6_ioctl = NULL; 2052 2053 MIF6_LOCK_DESTROY(); 2054 MFC6_LOCK_DESTROY(); 2055 MROUTER6_LOCK_DESTROY(); 2056 break; 2057 2058 default: 2059 return (EOPNOTSUPP); 2060 } 2061 2062 return (0); 2063} 2064 2065static moduledata_t ip6_mroutemod = { 2066 "ip6_mroute", 2067 ip6_mroute_modevent, 2068 0 2069}; 2070 2071DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2072