ip6_mroute.c revision 195727
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 195727 2009-07-16 21:13:04Z rwatson $"); 83 84#include "opt_inet.h" 85#include "opt_inet6.h" 86 87#include <sys/param.h> 88#include <sys/callout.h> 89#include <sys/errno.h> 90#include <sys/kernel.h> 91#include <sys/lock.h> 92#include <sys/malloc.h> 93#include <sys/mbuf.h> 94#include <sys/module.h> 95#include <sys/domain.h> 96#include <sys/protosw.h> 97#include <sys/signalvar.h> 98#include <sys/socket.h> 99#include <sys/socketvar.h> 100#include <sys/sockio.h> 101#include <sys/sx.h> 102#include <sys/sysctl.h> 103#include <sys/syslog.h> 104#include <sys/systm.h> 105#include <sys/time.h> 106#include <sys/vimage.h> 107 108#include <net/if.h> 109#include <net/if_types.h> 110#include <net/raw_cb.h> 111#include <net/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 <netinet6/ip6_var.h> 120#include <netinet6/scope6_var.h> 121#include <netinet6/nd6.h> 122#include <netinet6/ip6_mroute.h> 123#include <netinet6/ip6protosw.h> 124#include <netinet6/pim6.h> 125#include <netinet6/pim6_var.h> 126 127static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 128 129/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 130#define M_HASCL(m) ((m)->m_flags & M_EXT) 131 132static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 133static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 134static void pim6_init(void); 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_init = pim6_init, 153 .pr_usrreqs = &rip6_usrreqs 154}; 155static int pim6_encapcheck(const struct mbuf *, int, int, void *); 156 157static VNET_DEFINE(int, ip6_mrouter_ver); 158#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 159 160SYSCTL_DECL(_net_inet6); 161SYSCTL_DECL(_net_inet6_ip6); 162SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 163 164static struct mrt6stat mrt6stat; 165SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 166 &mrt6stat, mrt6stat, 167 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 168 169#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); /* 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_RD, 257 &pim6stat, pim6stat, 258 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 259 260static VNET_DEFINE(int, pim6); 261#define V_pim6 VNET(pim6) 262 263/* 264 * Hash function for a source, group entry 265 */ 266#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 267 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 268 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 269 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 270 271/* 272 * Find a route for a given origin IPv6 address and Multicast group address. 273 */ 274#define MF6CFIND(o, g, rt) do { \ 275 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 276 rt = NULL; \ 277 mrt6stat.mrt6s_mfc_lookups++; \ 278 while (_rt) { \ 279 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 280 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 281 (_rt->mf6c_stall == NULL)) { \ 282 rt = _rt; \ 283 break; \ 284 } \ 285 _rt = _rt->mf6c_next; \ 286 } \ 287 if (rt == NULL) { \ 288 mrt6stat.mrt6s_mfc_misses++; \ 289 } \ 290} while (/*CONSTCOND*/ 0) 291 292/* 293 * Macros to compute elapsed time efficiently 294 * Borrowed from Van Jacobson's scheduling code 295 * XXX: replace with timersub() ? 296 */ 297#define TV_DELTA(a, b, delta) do { \ 298 int xxs; \ 299 \ 300 delta = (a).tv_usec - (b).tv_usec; \ 301 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 302 switch (xxs) { \ 303 case 2: \ 304 delta += 1000000; \ 305 /* FALLTHROUGH */ \ 306 case 1: \ 307 delta += 1000000; \ 308 break; \ 309 default: \ 310 delta += (1000000 * xxs); \ 311 } \ 312 } \ 313} while (/*CONSTCOND*/ 0) 314 315/* XXX: replace with timercmp(a, b, <) ? */ 316#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 317 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 318 319#ifdef UPCALL_TIMING 320#define UPCALL_MAX 50 321static u_long upcall_data[UPCALL_MAX + 1]; 322static void collate(); 323#endif /* UPCALL_TIMING */ 324 325static int ip6_mrouter_init(struct socket *, int, int); 326static int add_m6fc(struct mf6cctl *); 327static int add_m6if(struct mif6ctl *); 328static int del_m6fc(struct mf6cctl *); 329static int del_m6if(mifi_t *); 330static int del_m6if_locked(mifi_t *); 331static int get_mif6_cnt(struct sioc_mif_req6 *); 332static int get_sg_cnt(struct sioc_sg_req6 *); 333 334static struct callout expire_upcalls_ch; 335 336int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 337int X_ip6_mrouter_done(void); 338int X_ip6_mrouter_set(struct socket *, struct sockopt *); 339int X_ip6_mrouter_get(struct socket *, struct sockopt *); 340int X_mrt6_ioctl(u_long, caddr_t); 341 342static void 343pim6_init(void) 344{ 345 346#ifdef MRT6DEBUG 347 V_mrt6debug = 0; /* debug level */ 348#endif 349} 350 351/* 352 * Handle MRT setsockopt commands to modify the multicast routing tables. 353 */ 354int 355X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 356{ 357 int error = 0; 358 int optval; 359 struct mif6ctl mifc; 360 struct mf6cctl mfcc; 361 mifi_t mifi; 362 363 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 364 return (EACCES); 365 366 switch (sopt->sopt_name) { 367 case MRT6_INIT: 368#ifdef MRT6_OINIT 369 case MRT6_OINIT: 370#endif 371 error = sooptcopyin(sopt, &optval, sizeof(optval), 372 sizeof(optval)); 373 if (error) 374 break; 375 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 376 break; 377 case MRT6_DONE: 378 error = X_ip6_mrouter_done(); 379 break; 380 case MRT6_ADD_MIF: 381 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 382 if (error) 383 break; 384 error = add_m6if(&mifc); 385 break; 386 case MRT6_ADD_MFC: 387 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 388 if (error) 389 break; 390 error = add_m6fc(&mfcc); 391 break; 392 case MRT6_DEL_MFC: 393 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 394 if (error) 395 break; 396 error = del_m6fc(&mfcc); 397 break; 398 case MRT6_DEL_MIF: 399 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 400 if (error) 401 break; 402 error = del_m6if(&mifi); 403 break; 404 case MRT6_PIM: 405 error = sooptcopyin(sopt, &optval, sizeof(optval), 406 sizeof(optval)); 407 if (error) 408 break; 409 error = set_pim6(&optval); 410 break; 411 default: 412 error = EOPNOTSUPP; 413 break; 414 } 415 416 return (error); 417} 418 419/* 420 * Handle MRT getsockopt commands 421 */ 422int 423X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 424{ 425 int error = 0; 426 427 if (so != V_ip6_mrouter) 428 return (EACCES); 429 430 switch (sopt->sopt_name) { 431 case MRT6_PIM: 432 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 433 break; 434 } 435 return (error); 436} 437 438/* 439 * Handle ioctl commands to obtain information from the cache 440 */ 441int 442X_mrt6_ioctl(u_long cmd, caddr_t data) 443{ 444 int ret; 445 446 ret = EINVAL; 447 448 switch (cmd) { 449 case SIOCGETSGCNT_IN6: 450 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 451 break; 452 453 case SIOCGETMIFCNT_IN6: 454 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 455 break; 456 457 default: 458 break; 459 } 460 461 return (ret); 462} 463 464/* 465 * returns the packet, byte, rpf-failure count for the source group provided 466 */ 467static int 468get_sg_cnt(struct sioc_sg_req6 *req) 469{ 470 struct mf6c *rt; 471 int ret; 472 473 ret = 0; 474 475 MFC6_LOCK(); 476 477 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 478 if (rt == NULL) { 479 ret = ESRCH; 480 } else { 481 req->pktcnt = rt->mf6c_pkt_cnt; 482 req->bytecnt = rt->mf6c_byte_cnt; 483 req->wrong_if = rt->mf6c_wrong_if; 484 } 485 486 MFC6_UNLOCK(); 487 488 return (ret); 489} 490 491/* 492 * returns the input and output packet and byte counts on the mif provided 493 */ 494static int 495get_mif6_cnt(struct sioc_mif_req6 *req) 496{ 497 mifi_t mifi; 498 int ret; 499 500 ret = 0; 501 mifi = req->mifi; 502 503 MIF6_LOCK(); 504 505 if (mifi >= nummifs) { 506 ret = EINVAL; 507 } else { 508 req->icount = mif6table[mifi].m6_pkt_in; 509 req->ocount = mif6table[mifi].m6_pkt_out; 510 req->ibytes = mif6table[mifi].m6_bytes_in; 511 req->obytes = mif6table[mifi].m6_bytes_out; 512 } 513 514 MIF6_UNLOCK(); 515 516 return (ret); 517} 518 519static int 520set_pim6(int *i) 521{ 522 if ((*i != 1) && (*i != 0)) 523 return (EINVAL); 524 525 V_pim6 = *i; 526 527 return (0); 528} 529 530/* 531 * Enable multicast routing 532 */ 533static int 534ip6_mrouter_init(struct socket *so, int v, int cmd) 535{ 536 537 V_ip6_mrouter_ver = 0; 538 539#ifdef MRT6DEBUG 540 V_mrt6debug = 0; 541 542 if (V_mrt6debug) 543 log(LOG_DEBUG, 544 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 545 so->so_type, so->so_proto->pr_protocol); 546#endif 547 548 if (so->so_type != SOCK_RAW || 549 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 550 return (EOPNOTSUPP); 551 552 if (v != 1) 553 return (ENOPROTOOPT); 554 555 MROUTER6_LOCK(); 556 557 if (V_ip6_mrouter != NULL) { 558 MROUTER6_UNLOCK(); 559 return (EADDRINUSE); 560 } 561 562 V_ip6_mrouter = so; 563 V_ip6_mrouter_ver = cmd; 564 565 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 566 bzero((caddr_t)n6expire, sizeof(n6expire)); 567 568 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 569 570 callout_init(&expire_upcalls_ch, 0); 571 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 572 expire_upcalls, NULL); 573 574 MROUTER6_UNLOCK(); 575 576#ifdef MRT6DEBUG 577 if (V_mrt6debug) 578 log(LOG_DEBUG, "ip6_mrouter_init\n"); 579#endif 580 581 return (0); 582} 583 584/* 585 * Disable IPv6 multicast forwarding. 586 */ 587int 588X_ip6_mrouter_done(void) 589{ 590 mifi_t mifi; 591 int i; 592 struct mf6c *rt; 593 struct rtdetq *rte; 594 595 MROUTER6_LOCK(); 596 597 if (V_ip6_mrouter == NULL) { 598 MROUTER6_UNLOCK(); 599 return (EINVAL); 600 } 601 602 /* 603 * For each phyint in use, disable promiscuous reception of all IPv6 604 * multicasts. 605 */ 606 for (mifi = 0; mifi < nummifs; mifi++) { 607 if (mif6table[mifi].m6_ifp && 608 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 609 if_allmulti(mif6table[mifi].m6_ifp, 0); 610 } 611 } 612 bzero((caddr_t)mif6table, sizeof(mif6table)); 613 nummifs = 0; 614 615 V_pim6 = 0; /* used to stub out/in pim specific code */ 616 617 callout_stop(&expire_upcalls_ch); 618 619 /* 620 * Free all multicast forwarding cache entries. 621 */ 622 MFC6_LOCK(); 623 for (i = 0; i < MF6CTBLSIZ; i++) { 624 rt = mf6ctable[i]; 625 while (rt) { 626 struct mf6c *frt; 627 628 for (rte = rt->mf6c_stall; rte != NULL; ) { 629 struct rtdetq *n = rte->next; 630 631 m_free(rte->m); 632 free(rte, M_MRTABLE6); 633 rte = n; 634 } 635 frt = rt; 636 rt = rt->mf6c_next; 637 free(frt, M_MRTABLE6); 638 } 639 } 640 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 641 MFC6_UNLOCK(); 642 643 /* 644 * Reset register interface 645 */ 646 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 647 if_detach(multicast_register_if6); 648 if_free(multicast_register_if6); 649 reg_mif_num = (mifi_t)-1; 650 multicast_register_if6 = NULL; 651 } 652 653 V_ip6_mrouter = NULL; 654 V_ip6_mrouter_ver = 0; 655 656 MROUTER6_UNLOCK(); 657 658#ifdef MRT6DEBUG 659 if (V_mrt6debug) 660 log(LOG_DEBUG, "ip6_mrouter_done\n"); 661#endif 662 663 return (0); 664} 665 666static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 667 668/* 669 * Add a mif to the mif table 670 */ 671static int 672add_m6if(struct mif6ctl *mifcp) 673{ 674 struct mif6 *mifp; 675 struct ifnet *ifp; 676 int error; 677 678 MIF6_LOCK(); 679 680 if (mifcp->mif6c_mifi >= MAXMIFS) { 681 MIF6_UNLOCK(); 682 return (EINVAL); 683 } 684 mifp = mif6table + mifcp->mif6c_mifi; 685 if (mifp->m6_ifp != NULL) { 686 MIF6_UNLOCK(); 687 return (EADDRINUSE); /* XXX: is it appropriate? */ 688 } 689 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 690 MIF6_UNLOCK(); 691 return (ENXIO); 692 } 693 694 ifp = ifnet_byindex(mifcp->mif6c_pifi); 695 696 if (mifcp->mif6c_flags & MIFF_REGISTER) { 697 if (reg_mif_num == (mifi_t)-1) { 698 ifp = if_alloc(IFT_OTHER); 699 700 if_initname(ifp, "register_mif", 0); 701 ifp->if_flags |= IFF_LOOPBACK; 702 if_attach(ifp); 703 multicast_register_if6 = ifp; 704 reg_mif_num = mifcp->mif6c_mifi; 705 /* 706 * it is impossible to guess the ifindex of the 707 * register interface. So mif6c_pifi is automatically 708 * calculated. 709 */ 710 mifcp->mif6c_pifi = ifp->if_index; 711 } else { 712 ifp = multicast_register_if6; 713 } 714 } else { 715 /* Make sure the interface supports multicast */ 716 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 717 MIF6_UNLOCK(); 718 return (EOPNOTSUPP); 719 } 720 721 error = if_allmulti(ifp, 1); 722 if (error) { 723 MIF6_UNLOCK(); 724 return (error); 725 } 726 } 727 728 mifp->m6_flags = mifcp->mif6c_flags; 729 mifp->m6_ifp = ifp; 730 731 /* initialize per mif pkt counters */ 732 mifp->m6_pkt_in = 0; 733 mifp->m6_pkt_out = 0; 734 mifp->m6_bytes_in = 0; 735 mifp->m6_bytes_out = 0; 736 bzero(&mifp->m6_route, sizeof(mifp->m6_route)); 737 738 /* Adjust nummifs up if the mifi is higher than nummifs */ 739 if (nummifs <= mifcp->mif6c_mifi) 740 nummifs = mifcp->mif6c_mifi + 1; 741 742 MIF6_UNLOCK(); 743 744#ifdef MRT6DEBUG 745 if (V_mrt6debug) 746 log(LOG_DEBUG, 747 "add_mif #%d, phyint %s\n", 748 mifcp->mif6c_mifi, 749 ifp->if_xname); 750#endif 751 752 return (0); 753} 754 755/* 756 * Delete a mif from the mif table 757 */ 758static int 759del_m6if_locked(mifi_t *mifip) 760{ 761 struct mif6 *mifp = mif6table + *mifip; 762 mifi_t mifi; 763 struct ifnet *ifp; 764 765 MIF6_LOCK_ASSERT(); 766 767 if (*mifip >= nummifs) 768 return (EINVAL); 769 if (mifp->m6_ifp == NULL) 770 return (EINVAL); 771 772 if (!(mifp->m6_flags & MIFF_REGISTER)) { 773 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 774 ifp = mifp->m6_ifp; 775 if_allmulti(ifp, 0); 776 } else { 777 if (reg_mif_num != (mifi_t)-1 && 778 multicast_register_if6 != NULL) { 779 if_detach(multicast_register_if6); 780 if_free(multicast_register_if6); 781 reg_mif_num = (mifi_t)-1; 782 multicast_register_if6 = NULL; 783 } 784 } 785 786 bzero((caddr_t)mifp, sizeof(*mifp)); 787 788 /* Adjust nummifs down */ 789 for (mifi = nummifs; mifi > 0; mifi--) 790 if (mif6table[mifi - 1].m6_ifp) 791 break; 792 nummifs = mifi; 793 794#ifdef MRT6DEBUG 795 if (V_mrt6debug) 796 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 797#endif 798 799 return (0); 800} 801 802static int 803del_m6if(mifi_t *mifip) 804{ 805 int cc; 806 807 MIF6_LOCK(); 808 cc = del_m6if_locked(mifip); 809 MIF6_UNLOCK(); 810 811 return (cc); 812} 813 814/* 815 * Add an mfc entry 816 */ 817static int 818add_m6fc(struct mf6cctl *mfccp) 819{ 820 struct mf6c *rt; 821 u_long hash; 822 struct rtdetq *rte; 823 u_short nstl; 824 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 825 826 MFC6_LOCK(); 827 828 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 829 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 830 831 /* If an entry already exists, just update the fields */ 832 if (rt) { 833#ifdef MRT6DEBUG 834 if (V_mrt6debug & DEBUG_MFC) { 835 log(LOG_DEBUG, 836 "add_m6fc no upcall h %d o %s g %s p %x\n", 837 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 838 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 839 mfccp->mf6cc_parent); 840 } 841#endif 842 843 rt->mf6c_parent = mfccp->mf6cc_parent; 844 rt->mf6c_ifset = mfccp->mf6cc_ifset; 845 846 MFC6_UNLOCK(); 847 return (0); 848 } 849 850 /* 851 * Find the entry for which the upcall was made and update 852 */ 853 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 854 mfccp->mf6cc_mcastgrp.sin6_addr); 855 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 856 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 857 &mfccp->mf6cc_origin.sin6_addr) && 858 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 859 &mfccp->mf6cc_mcastgrp.sin6_addr) && 860 (rt->mf6c_stall != NULL)) { 861 862 if (nstl++) 863 log(LOG_ERR, 864 "add_m6fc: %s o %s g %s p %x dbx %p\n", 865 "multiple kernel entries", 866 ip6_sprintf(ip6bufo, 867 &mfccp->mf6cc_origin.sin6_addr), 868 ip6_sprintf(ip6bufg, 869 &mfccp->mf6cc_mcastgrp.sin6_addr), 870 mfccp->mf6cc_parent, rt->mf6c_stall); 871 872#ifdef MRT6DEBUG 873 if (V_mrt6debug & DEBUG_MFC) 874 log(LOG_DEBUG, 875 "add_m6fc o %s g %s p %x dbg %x\n", 876 ip6_sprintf(ip6bufo, 877 &mfccp->mf6cc_origin.sin6_addr), 878 ip6_sprintf(ip6bufg, 879 &mfccp->mf6cc_mcastgrp.sin6_addr), 880 mfccp->mf6cc_parent, rt->mf6c_stall); 881#endif 882 883 rt->mf6c_origin = mfccp->mf6cc_origin; 884 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 885 rt->mf6c_parent = mfccp->mf6cc_parent; 886 rt->mf6c_ifset = mfccp->mf6cc_ifset; 887 /* initialize pkt counters per src-grp */ 888 rt->mf6c_pkt_cnt = 0; 889 rt->mf6c_byte_cnt = 0; 890 rt->mf6c_wrong_if = 0; 891 892 rt->mf6c_expire = 0; /* Don't clean this guy up */ 893 n6expire[hash]--; 894 895 /* free packets Qed at the end of this entry */ 896 for (rte = rt->mf6c_stall; rte != NULL; ) { 897 struct rtdetq *n = rte->next; 898 ip6_mdq(rte->m, rte->ifp, rt); 899 m_freem(rte->m); 900#ifdef UPCALL_TIMING 901 collate(&(rte->t)); 902#endif /* UPCALL_TIMING */ 903 free(rte, M_MRTABLE6); 904 rte = n; 905 } 906 rt->mf6c_stall = NULL; 907 } 908 } 909 910 /* 911 * It is possible that an entry is being inserted without an upcall 912 */ 913 if (nstl == 0) { 914#ifdef MRT6DEBUG 915 if (V_mrt6debug & DEBUG_MFC) 916 log(LOG_DEBUG, 917 "add_mfc no upcall h %d o %s g %s p %x\n", 918 hash, 919 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 920 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 921 mfccp->mf6cc_parent); 922#endif 923 924 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 925 926 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 927 &mfccp->mf6cc_origin.sin6_addr)&& 928 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 929 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 930 931 rt->mf6c_origin = mfccp->mf6cc_origin; 932 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 933 rt->mf6c_parent = mfccp->mf6cc_parent; 934 rt->mf6c_ifset = mfccp->mf6cc_ifset; 935 /* initialize pkt counters per src-grp */ 936 rt->mf6c_pkt_cnt = 0; 937 rt->mf6c_byte_cnt = 0; 938 rt->mf6c_wrong_if = 0; 939 940 if (rt->mf6c_expire) 941 n6expire[hash]--; 942 rt->mf6c_expire = 0; 943 } 944 } 945 if (rt == NULL) { 946 /* no upcall, so make a new entry */ 947 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 948 M_NOWAIT); 949 if (rt == NULL) { 950 MFC6_UNLOCK(); 951 return (ENOBUFS); 952 } 953 954 /* insert new entry at head of hash chain */ 955 rt->mf6c_origin = mfccp->mf6cc_origin; 956 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 957 rt->mf6c_parent = mfccp->mf6cc_parent; 958 rt->mf6c_ifset = mfccp->mf6cc_ifset; 959 /* initialize pkt counters per src-grp */ 960 rt->mf6c_pkt_cnt = 0; 961 rt->mf6c_byte_cnt = 0; 962 rt->mf6c_wrong_if = 0; 963 rt->mf6c_expire = 0; 964 rt->mf6c_stall = NULL; 965 966 /* link into table */ 967 rt->mf6c_next = mf6ctable[hash]; 968 mf6ctable[hash] = rt; 969 } 970 } 971 972 MFC6_UNLOCK(); 973 return (0); 974} 975 976#ifdef UPCALL_TIMING 977/* 978 * collect delay statistics on the upcalls 979 */ 980static void 981collate(struct timeval *t) 982{ 983 u_long d; 984 struct timeval tp; 985 u_long delta; 986 987 GET_TIME(tp); 988 989 if (TV_LT(*t, tp)) 990 { 991 TV_DELTA(tp, *t, delta); 992 993 d = delta >> 10; 994 if (d > UPCALL_MAX) 995 d = UPCALL_MAX; 996 997 ++upcall_data[d]; 998 } 999} 1000#endif /* UPCALL_TIMING */ 1001 1002/* 1003 * Delete an mfc entry 1004 */ 1005static int 1006del_m6fc(struct mf6cctl *mfccp) 1007{ 1008 struct sockaddr_in6 origin; 1009 struct sockaddr_in6 mcastgrp; 1010 struct mf6c *rt; 1011 struct mf6c **nptr; 1012 u_long hash; 1013 1014 origin = mfccp->mf6cc_origin; 1015 mcastgrp = mfccp->mf6cc_mcastgrp; 1016 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1017 1018#ifdef MRT6DEBUG 1019 if (V_mrt6debug & DEBUG_MFC) { 1020 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1021 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 1022 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1023 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1024 } 1025#endif 1026 1027 MFC6_LOCK(); 1028 1029 nptr = &mf6ctable[hash]; 1030 while ((rt = *nptr) != NULL) { 1031 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1032 &rt->mf6c_origin.sin6_addr) && 1033 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1034 &rt->mf6c_mcastgrp.sin6_addr) && 1035 rt->mf6c_stall == NULL) 1036 break; 1037 1038 nptr = &rt->mf6c_next; 1039 } 1040 if (rt == NULL) { 1041 MFC6_UNLOCK(); 1042 return (EADDRNOTAVAIL); 1043 } 1044 1045 *nptr = rt->mf6c_next; 1046 free(rt, M_MRTABLE6); 1047 1048 MFC6_UNLOCK(); 1049 1050 return (0); 1051} 1052 1053static int 1054socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1055{ 1056 1057 if (s) { 1058 if (sbappendaddr(&s->so_rcv, 1059 (struct sockaddr *)src, 1060 mm, (struct mbuf *)0) != 0) { 1061 sorwakeup(s); 1062 return (0); 1063 } 1064 } 1065 m_freem(mm); 1066 return (-1); 1067} 1068 1069/* 1070 * IPv6 multicast forwarding function. This function assumes that the packet 1071 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1072 * pointed to by "ifp", and the packet is to be relayed to other networks 1073 * that have members of the packet's destination IPv6 multicast group. 1074 * 1075 * The packet is returned unscathed to the caller, unless it is 1076 * erroneous, in which case a non-zero return value tells the caller to 1077 * discard it. 1078 * 1079 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1080 * this function is called in the originating context (i.e., not when 1081 * forwarding a packet from other node). ip6_output(), which is currently the 1082 * only function that calls this function is called in the originating context, 1083 * explicitly ensures this condition. It is caller's responsibility to ensure 1084 * that if this function is called from somewhere else in the originating 1085 * context in the future. 1086 */ 1087int 1088X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1089{ 1090 struct mf6c *rt; 1091 struct mif6 *mifp; 1092 struct mbuf *mm; 1093 mifi_t mifi; 1094 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1095 1096#ifdef MRT6DEBUG 1097 if (V_mrt6debug & DEBUG_FORWARD) 1098 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1099 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1100 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1101 ifp->if_index); 1102#endif 1103 1104 /* 1105 * Don't forward a packet with Hop limit of zero or one, 1106 * or a packet destined to a local-only group. 1107 */ 1108 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1109 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1110 return (0); 1111 ip6->ip6_hlim--; 1112 1113 /* 1114 * Source address check: do not forward packets with unspecified 1115 * source. It was discussed in July 2000, on ipngwg mailing list. 1116 * This is rather more serious than unicast cases, because some 1117 * MLD packets can be sent with the unspecified source address 1118 * (although such packets must normally set 1 to the hop limit field). 1119 */ 1120 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1121 V_ip6stat.ip6s_cantforward++; 1122 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1123 V_ip6_log_time = time_second; 1124 log(LOG_DEBUG, 1125 "cannot forward " 1126 "from %s to %s nxt %d received on %s\n", 1127 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1128 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1129 ip6->ip6_nxt, 1130 if_name(m->m_pkthdr.rcvif)); 1131 } 1132 return (0); 1133 } 1134 1135 MFC6_LOCK(); 1136 1137 /* 1138 * Determine forwarding mifs from the forwarding cache table 1139 */ 1140 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1141 1142 /* Entry exists, so forward if necessary */ 1143 if (rt) { 1144 MFC6_UNLOCK(); 1145 return (ip6_mdq(m, ifp, rt)); 1146 } else { 1147 /* 1148 * If we don't have a route for packet's origin, 1149 * Make a copy of the packet & 1150 * send message to routing daemon 1151 */ 1152 1153 struct mbuf *mb0; 1154 struct rtdetq *rte; 1155 u_long hash; 1156/* int i, npkts;*/ 1157#ifdef UPCALL_TIMING 1158 struct timeval tp; 1159 1160 GET_TIME(tp); 1161#endif /* UPCALL_TIMING */ 1162 1163 mrt6stat.mrt6s_no_route++; 1164#ifdef MRT6DEBUG 1165 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1166 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1167 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1168 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1169#endif 1170 1171 /* 1172 * Allocate mbufs early so that we don't do extra work if we 1173 * are just going to fail anyway. 1174 */ 1175 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1176 M_NOWAIT); 1177 if (rte == NULL) { 1178 MFC6_UNLOCK(); 1179 return (ENOBUFS); 1180 } 1181 mb0 = m_copy(m, 0, M_COPYALL); 1182 /* 1183 * Pullup packet header if needed before storing it, 1184 * as other references may modify it in the meantime. 1185 */ 1186 if (mb0 && 1187 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1188 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1189 if (mb0 == NULL) { 1190 free(rte, M_MRTABLE6); 1191 MFC6_UNLOCK(); 1192 return (ENOBUFS); 1193 } 1194 1195 /* is there an upcall waiting for this packet? */ 1196 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1197 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1198 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1199 &rt->mf6c_origin.sin6_addr) && 1200 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1201 &rt->mf6c_mcastgrp.sin6_addr) && 1202 (rt->mf6c_stall != NULL)) 1203 break; 1204 } 1205 1206 if (rt == NULL) { 1207 struct mrt6msg *im; 1208#ifdef MRT6_OINIT 1209 struct omrt6msg *oim; 1210#endif 1211 1212 /* no upcall, so make a new entry */ 1213 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1214 M_NOWAIT); 1215 if (rt == NULL) { 1216 free(rte, M_MRTABLE6); 1217 m_freem(mb0); 1218 MFC6_UNLOCK(); 1219 return (ENOBUFS); 1220 } 1221 /* 1222 * Make a copy of the header to send to the user 1223 * level process 1224 */ 1225 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1226 1227 if (mm == NULL) { 1228 free(rte, M_MRTABLE6); 1229 m_freem(mb0); 1230 free(rt, M_MRTABLE6); 1231 MFC6_UNLOCK(); 1232 return (ENOBUFS); 1233 } 1234 1235 /* 1236 * Send message to routing daemon 1237 */ 1238 sin6.sin6_addr = ip6->ip6_src; 1239 1240 im = NULL; 1241#ifdef MRT6_OINIT 1242 oim = NULL; 1243#endif 1244 switch (V_ip6_mrouter_ver) { 1245#ifdef MRT6_OINIT 1246 case MRT6_OINIT: 1247 oim = mtod(mm, struct omrt6msg *); 1248 oim->im6_msgtype = MRT6MSG_NOCACHE; 1249 oim->im6_mbz = 0; 1250 break; 1251#endif 1252 case MRT6_INIT: 1253 im = mtod(mm, struct mrt6msg *); 1254 im->im6_msgtype = MRT6MSG_NOCACHE; 1255 im->im6_mbz = 0; 1256 break; 1257 default: 1258 free(rte, M_MRTABLE6); 1259 m_freem(mb0); 1260 free(rt, M_MRTABLE6); 1261 MFC6_UNLOCK(); 1262 return (EINVAL); 1263 } 1264 1265#ifdef MRT6DEBUG 1266 if (V_mrt6debug & DEBUG_FORWARD) 1267 log(LOG_DEBUG, 1268 "getting the iif info in the kernel\n"); 1269#endif 1270 1271 for (mifp = mif6table, mifi = 0; 1272 mifi < nummifs && mifp->m6_ifp != ifp; 1273 mifp++, mifi++) 1274 ; 1275 1276 switch (V_ip6_mrouter_ver) { 1277#ifdef MRT6_OINIT 1278 case MRT6_OINIT: 1279 oim->im6_mif = mifi; 1280 break; 1281#endif 1282 case MRT6_INIT: 1283 im->im6_mif = mifi; 1284 break; 1285 } 1286 1287 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1288 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1289 "socket queue full\n"); 1290 mrt6stat.mrt6s_upq_sockfull++; 1291 free(rte, M_MRTABLE6); 1292 m_freem(mb0); 1293 free(rt, M_MRTABLE6); 1294 MFC6_UNLOCK(); 1295 return (ENOBUFS); 1296 } 1297 1298 mrt6stat.mrt6s_upcalls++; 1299 1300 /* insert new entry at head of hash chain */ 1301 bzero(rt, sizeof(*rt)); 1302 rt->mf6c_origin.sin6_family = AF_INET6; 1303 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1304 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1305 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1306 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1307 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1308 rt->mf6c_expire = UPCALL_EXPIRE; 1309 n6expire[hash]++; 1310 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1311 1312 /* link into table */ 1313 rt->mf6c_next = mf6ctable[hash]; 1314 mf6ctable[hash] = rt; 1315 /* Add this entry to the end of the queue */ 1316 rt->mf6c_stall = rte; 1317 } else { 1318 /* determine if q has overflowed */ 1319 struct rtdetq **p; 1320 int npkts = 0; 1321 1322 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1323 if (++npkts > MAX_UPQ6) { 1324 mrt6stat.mrt6s_upq_ovflw++; 1325 free(rte, M_MRTABLE6); 1326 m_freem(mb0); 1327 MFC6_UNLOCK(); 1328 return (0); 1329 } 1330 1331 /* Add this entry to the end of the queue */ 1332 *p = rte; 1333 } 1334 1335 rte->next = NULL; 1336 rte->m = mb0; 1337 rte->ifp = ifp; 1338#ifdef UPCALL_TIMING 1339 rte->t = tp; 1340#endif /* UPCALL_TIMING */ 1341 1342 MFC6_UNLOCK(); 1343 1344 return (0); 1345 } 1346} 1347 1348/* 1349 * Clean up cache entries if upcalls are not serviced 1350 * Call from the Slow Timeout mechanism, every half second. 1351 */ 1352static void 1353expire_upcalls(void *unused) 1354{ 1355 struct rtdetq *rte; 1356 struct mf6c *mfc, **nptr; 1357 int i; 1358 1359 MFC6_LOCK(); 1360 for (i = 0; i < MF6CTBLSIZ; i++) { 1361 if (n6expire[i] == 0) 1362 continue; 1363 nptr = &mf6ctable[i]; 1364 while ((mfc = *nptr) != NULL) { 1365 rte = mfc->mf6c_stall; 1366 /* 1367 * Skip real cache entries 1368 * Make sure it wasn't marked to not expire (shouldn't happen) 1369 * If it expires now 1370 */ 1371 if (rte != NULL && 1372 mfc->mf6c_expire != 0 && 1373 --mfc->mf6c_expire == 0) { 1374#ifdef MRT6DEBUG 1375 if (V_mrt6debug & DEBUG_EXPIRE) { 1376 char ip6bufo[INET6_ADDRSTRLEN]; 1377 char ip6bufg[INET6_ADDRSTRLEN]; 1378 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1379 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1380 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1381 } 1382#endif 1383 /* 1384 * drop all the packets 1385 * free the mbuf with the pkt, if, timing info 1386 */ 1387 do { 1388 struct rtdetq *n = rte->next; 1389 m_freem(rte->m); 1390 free(rte, M_MRTABLE6); 1391 rte = n; 1392 } while (rte != NULL); 1393 mrt6stat.mrt6s_cache_cleanups++; 1394 n6expire[i]--; 1395 1396 *nptr = mfc->mf6c_next; 1397 free(mfc, M_MRTABLE6); 1398 } else { 1399 nptr = &mfc->mf6c_next; 1400 } 1401 } 1402 } 1403 MFC6_UNLOCK(); 1404 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1405 expire_upcalls, NULL); 1406} 1407 1408/* 1409 * Packet forwarding routine once entry in the cache is made 1410 */ 1411static int 1412ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1413{ 1414 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1415 mifi_t mifi, iif; 1416 struct mif6 *mifp; 1417 int plen = m->m_pkthdr.len; 1418 struct in6_addr src0, dst0; /* copies for local work */ 1419 u_int32_t iszone, idzone, oszone, odzone; 1420 int error = 0; 1421 1422/* 1423 * Macro to send packet on mif. Since RSVP packets don't get counted on 1424 * input, they shouldn't get counted on output, so statistics keeping is 1425 * separate. 1426 */ 1427 1428#define MC6_SEND(ip6, mifp, m) do { \ 1429 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1430 register_send((ip6), (mifp), (m)); \ 1431 else \ 1432 phyint_send((ip6), (mifp), (m)); \ 1433} while (/*CONSTCOND*/ 0) 1434 1435 /* 1436 * Don't forward if it didn't arrive from the parent mif 1437 * for its origin. 1438 */ 1439 mifi = rt->mf6c_parent; 1440 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1441 /* came in the wrong interface */ 1442#ifdef MRT6DEBUG 1443 if (V_mrt6debug & DEBUG_FORWARD) 1444 log(LOG_DEBUG, 1445 "wrong if: ifid %d mifi %d mififid %x\n", 1446 ifp->if_index, mifi, 1447 mif6table[mifi].m6_ifp->if_index); 1448#endif 1449 mrt6stat.mrt6s_wrong_if++; 1450 rt->mf6c_wrong_if++; 1451 /* 1452 * If we are doing PIM processing, and we are forwarding 1453 * packets on this interface, send a message to the 1454 * routing daemon. 1455 */ 1456 /* have to make sure this is a valid mif */ 1457 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1458 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1459 /* 1460 * Check the M_LOOP flag to avoid an 1461 * unnecessary PIM assert. 1462 * XXX: M_LOOP is an ad-hoc hack... 1463 */ 1464 static struct sockaddr_in6 sin6 = 1465 { sizeof(sin6), AF_INET6 }; 1466 1467 struct mbuf *mm; 1468 struct mrt6msg *im; 1469#ifdef MRT6_OINIT 1470 struct omrt6msg *oim; 1471#endif 1472 1473 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1474 if (mm && 1475 (M_HASCL(mm) || 1476 mm->m_len < sizeof(struct ip6_hdr))) 1477 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1478 if (mm == NULL) 1479 return (ENOBUFS); 1480 1481#ifdef MRT6_OINIT 1482 oim = NULL; 1483#endif 1484 im = NULL; 1485 switch (V_ip6_mrouter_ver) { 1486#ifdef MRT6_OINIT 1487 case MRT6_OINIT: 1488 oim = mtod(mm, struct omrt6msg *); 1489 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1490 oim->im6_mbz = 0; 1491 break; 1492#endif 1493 case MRT6_INIT: 1494 im = mtod(mm, struct mrt6msg *); 1495 im->im6_msgtype = MRT6MSG_WRONGMIF; 1496 im->im6_mbz = 0; 1497 break; 1498 default: 1499 m_freem(mm); 1500 return (EINVAL); 1501 } 1502 1503 for (mifp = mif6table, iif = 0; 1504 iif < nummifs && mifp && 1505 mifp->m6_ifp != ifp; 1506 mifp++, iif++) 1507 ; 1508 1509 switch (V_ip6_mrouter_ver) { 1510#ifdef MRT6_OINIT 1511 case MRT6_OINIT: 1512 oim->im6_mif = iif; 1513 sin6.sin6_addr = oim->im6_src; 1514 break; 1515#endif 1516 case MRT6_INIT: 1517 im->im6_mif = iif; 1518 sin6.sin6_addr = im->im6_src; 1519 break; 1520 } 1521 1522 mrt6stat.mrt6s_upcalls++; 1523 1524 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1525#ifdef MRT6DEBUG 1526 if (V_mrt6debug) 1527 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1528#endif 1529 ++mrt6stat.mrt6s_upq_sockfull; 1530 return (ENOBUFS); 1531 } /* if socket Q full */ 1532 } /* if PIM */ 1533 return (0); 1534 } /* if wrong iif */ 1535 1536 /* If I sourced this packet, it counts as output, else it was input. */ 1537 if (m->m_pkthdr.rcvif == NULL) { 1538 /* XXX: is rcvif really NULL when output?? */ 1539 mif6table[mifi].m6_pkt_out++; 1540 mif6table[mifi].m6_bytes_out += plen; 1541 } else { 1542 mif6table[mifi].m6_pkt_in++; 1543 mif6table[mifi].m6_bytes_in += plen; 1544 } 1545 rt->mf6c_pkt_cnt++; 1546 rt->mf6c_byte_cnt += plen; 1547 1548 /* 1549 * For each mif, forward a copy of the packet if there are group 1550 * members downstream on the interface. 1551 */ 1552 src0 = ip6->ip6_src; 1553 dst0 = ip6->ip6_dst; 1554 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1555 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1556 V_ip6stat.ip6s_badscope++; 1557 return (error); 1558 } 1559 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1560 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1561 /* 1562 * check if the outgoing packet is going to break 1563 * a scope boundary. 1564 * XXX For packets through PIM register tunnel 1565 * interface, we believe a routing daemon. 1566 */ 1567 if (!(mif6table[rt->mf6c_parent].m6_flags & 1568 MIFF_REGISTER) && 1569 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1570 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1571 &oszone) || 1572 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1573 &odzone) || 1574 iszone != oszone || 1575 idzone != odzone) { 1576 V_ip6stat.ip6s_badscope++; 1577 continue; 1578 } 1579 } 1580 1581 mifp->m6_pkt_out++; 1582 mifp->m6_bytes_out += plen; 1583 MC6_SEND(ip6, mifp, m); 1584 } 1585 } 1586 return (0); 1587} 1588 1589static void 1590phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1591{ 1592 struct mbuf *mb_copy; 1593 struct ifnet *ifp = mifp->m6_ifp; 1594 int error = 0; 1595 struct sockaddr_in6 *dst6; 1596 u_long linkmtu; 1597 1598 dst6 = &mifp->m6_route.ro_dst; 1599 1600 /* 1601 * Make a new reference to the packet; make sure that 1602 * the IPv6 header is actually copied, not just referenced, 1603 * so that ip6_output() only scribbles on the copy. 1604 */ 1605 mb_copy = m_copy(m, 0, M_COPYALL); 1606 if (mb_copy && 1607 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1608 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1609 if (mb_copy == NULL) { 1610 return; 1611 } 1612 /* set MCAST flag to the outgoing packet */ 1613 mb_copy->m_flags |= M_MCAST; 1614 1615 /* 1616 * If we sourced the packet, call ip6_output since we may devide 1617 * the packet into fragments when the packet is too big for the 1618 * outgoing interface. 1619 * Otherwise, we can simply send the packet to the interface 1620 * sending queue. 1621 */ 1622 if (m->m_pkthdr.rcvif == NULL) { 1623 struct ip6_moptions im6o; 1624 1625 im6o.im6o_multicast_ifp = ifp; 1626 /* XXX: ip6_output will override ip6->ip6_hlim */ 1627 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1628 im6o.im6o_multicast_loop = 1; 1629 error = ip6_output(mb_copy, NULL, &mifp->m6_route, 1630 IPV6_FORWARDING, &im6o, NULL, NULL); 1631 1632#ifdef MRT6DEBUG 1633 if (V_mrt6debug & DEBUG_XMIT) 1634 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1635 mifp - mif6table, error); 1636#endif 1637 return; 1638 } 1639 1640 /* 1641 * If configured to loop back multicasts by default, 1642 * loop back a copy now. 1643 */ 1644 if (in6_mcast_loop) { 1645 dst6->sin6_len = sizeof(struct sockaddr_in6); 1646 dst6->sin6_family = AF_INET6; 1647 dst6->sin6_addr = ip6->ip6_dst; 1648 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst); 1649 } 1650 1651 /* 1652 * Put the packet into the sending queue of the outgoing interface 1653 * if it would fit in the MTU of the interface. 1654 */ 1655 linkmtu = IN6_LINKMTU(ifp); 1656 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1657 dst6->sin6_len = sizeof(struct sockaddr_in6); 1658 dst6->sin6_family = AF_INET6; 1659 dst6->sin6_addr = ip6->ip6_dst; 1660 /* 1661 * We just call if_output instead of nd6_output here, since 1662 * we need no ND for a multicast forwarded packet...right? 1663 */ 1664 error = (*ifp->if_output)(ifp, mb_copy, 1665 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL); 1666#ifdef MRT6DEBUG 1667 if (V_mrt6debug & DEBUG_XMIT) 1668 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1669 mifp - mif6table, error); 1670#endif 1671 } else { 1672 /* 1673 * pMTU discovery is intentionally disabled by default, since 1674 * various router may notify pMTU in multicast, which can be 1675 * a DDoS to a router 1676 */ 1677 if (V_ip6_mcast_pmtu) 1678 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1679 else { 1680#ifdef MRT6DEBUG 1681 if (V_mrt6debug & DEBUG_XMIT) { 1682 char ip6bufs[INET6_ADDRSTRLEN]; 1683 char ip6bufd[INET6_ADDRSTRLEN]; 1684 log(LOG_DEBUG, 1685 "phyint_send: packet too big on %s o %s " 1686 "g %s size %d(discarded)\n", 1687 if_name(ifp), 1688 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1689 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1690 mb_copy->m_pkthdr.len); 1691 } 1692#endif /* MRT6DEBUG */ 1693 m_freem(mb_copy); /* simply discard the packet */ 1694 } 1695 } 1696} 1697 1698static int 1699register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1700{ 1701 struct mbuf *mm; 1702 int i, len = m->m_pkthdr.len; 1703 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1704 struct mrt6msg *im6; 1705 1706#ifdef MRT6DEBUG 1707 if (V_mrt6debug) { 1708 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1709 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1710 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1711 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1712 } 1713#endif 1714 ++pim6stat.pim6s_snd_registers; 1715 1716 /* Make a copy of the packet to send to the user level process */ 1717 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1718 if (mm == NULL) 1719 return (ENOBUFS); 1720 mm->m_pkthdr.rcvif = NULL; 1721 mm->m_data += max_linkhdr; 1722 mm->m_len = sizeof(struct ip6_hdr); 1723 1724 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1725 m_freem(mm); 1726 return (ENOBUFS); 1727 } 1728 i = MHLEN - M_LEADINGSPACE(mm); 1729 if (i > len) 1730 i = len; 1731 mm = m_pullup(mm, i); 1732 if (mm == NULL) 1733 return (ENOBUFS); 1734/* TODO: check it! */ 1735 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1736 1737 /* 1738 * Send message to routing daemon 1739 */ 1740 sin6.sin6_addr = ip6->ip6_src; 1741 1742 im6 = mtod(mm, struct mrt6msg *); 1743 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1744 im6->im6_mbz = 0; 1745 1746 im6->im6_mif = mif - mif6table; 1747 1748 /* iif info is not given for reg. encap.n */ 1749 mrt6stat.mrt6s_upcalls++; 1750 1751 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1752#ifdef MRT6DEBUG 1753 if (V_mrt6debug) 1754 log(LOG_WARNING, 1755 "register_send: ip6_mrouter socket queue full\n"); 1756#endif 1757 ++mrt6stat.mrt6s_upq_sockfull; 1758 return (ENOBUFS); 1759 } 1760 return (0); 1761} 1762 1763/* 1764 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1765 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1766 * into the kernel. 1767 */ 1768static int 1769pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1770{ 1771 1772#ifdef DIAGNOSTIC 1773 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1774#endif 1775 if (proto != IPPROTO_PIM) 1776 return 0; /* not for us; reject the datagram. */ 1777 1778 return 64; /* claim the datagram. */ 1779} 1780 1781/* 1782 * PIM sparse mode hook 1783 * Receives the pim control messages, and passes them up to the listening 1784 * socket, using rip6_input. 1785 * The only message processed is the REGISTER pim message; the pim header 1786 * is stripped off, and the inner packet is passed to register_mforward. 1787 */ 1788int 1789pim6_input(struct mbuf **mp, int *offp, int proto) 1790{ 1791 struct pim *pim; /* pointer to a pim struct */ 1792 struct ip6_hdr *ip6; 1793 int pimlen; 1794 struct mbuf *m = *mp; 1795 int minlen; 1796 int off = *offp; 1797 1798 ++pim6stat.pim6s_rcv_total; 1799 1800 ip6 = mtod(m, struct ip6_hdr *); 1801 pimlen = m->m_pkthdr.len - *offp; 1802 1803 /* 1804 * Validate lengths 1805 */ 1806 if (pimlen < PIM_MINLEN) { 1807 ++pim6stat.pim6s_rcv_tooshort; 1808#ifdef MRT6DEBUG 1809 if (V_mrt6debug & DEBUG_PIM) 1810 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1811#endif 1812 m_freem(m); 1813 return (IPPROTO_DONE); 1814 } 1815 1816 /* 1817 * if the packet is at least as big as a REGISTER, go ahead 1818 * and grab the PIM REGISTER header size, to avoid another 1819 * possible m_pullup() later. 1820 * 1821 * PIM_MINLEN == pimhdr + u_int32 == 8 1822 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1823 */ 1824 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1825 1826 /* 1827 * Make sure that the IP6 and PIM headers in contiguous memory, and 1828 * possibly the PIM REGISTER header 1829 */ 1830#ifndef PULLDOWN_TEST 1831 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1832 /* adjust pointer */ 1833 ip6 = mtod(m, struct ip6_hdr *); 1834 1835 /* adjust mbuf to point to the PIM header */ 1836 pim = (struct pim *)((caddr_t)ip6 + off); 1837#else 1838 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1839 if (pim == NULL) { 1840 pim6stat.pim6s_rcv_tooshort++; 1841 return (IPPROTO_DONE); 1842 } 1843#endif 1844 1845#define PIM6_CHECKSUM 1846#ifdef PIM6_CHECKSUM 1847 { 1848 int cksumlen; 1849 1850 /* 1851 * Validate checksum. 1852 * If PIM REGISTER, exclude the data packet 1853 */ 1854 if (pim->pim_type == PIM_REGISTER) 1855 cksumlen = PIM_MINLEN; 1856 else 1857 cksumlen = pimlen; 1858 1859 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1860 ++pim6stat.pim6s_rcv_badsum; 1861#ifdef MRT6DEBUG 1862 if (V_mrt6debug & DEBUG_PIM) 1863 log(LOG_DEBUG, 1864 "pim6_input: invalid checksum\n"); 1865#endif 1866 m_freem(m); 1867 return (IPPROTO_DONE); 1868 } 1869 } 1870#endif /* PIM_CHECKSUM */ 1871 1872 /* PIM version check */ 1873 if (pim->pim_ver != PIM_VERSION) { 1874 ++pim6stat.pim6s_rcv_badversion; 1875#ifdef MRT6DEBUG 1876 log(LOG_ERR, 1877 "pim6_input: incorrect version %d, expecting %d\n", 1878 pim->pim_ver, PIM_VERSION); 1879#endif 1880 m_freem(m); 1881 return (IPPROTO_DONE); 1882 } 1883 1884 if (pim->pim_type == PIM_REGISTER) { 1885 /* 1886 * since this is a REGISTER, we'll make a copy of the register 1887 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1888 * routing daemon. 1889 */ 1890 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1891 1892 struct mbuf *mcp; 1893 struct ip6_hdr *eip6; 1894 u_int32_t *reghdr; 1895 int rc; 1896#ifdef MRT6DEBUG 1897 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1898#endif 1899 1900 ++pim6stat.pim6s_rcv_registers; 1901 1902 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1903#ifdef MRT6DEBUG 1904 if (V_mrt6debug & DEBUG_PIM) 1905 log(LOG_DEBUG, 1906 "pim6_input: register mif not set: %d\n", 1907 reg_mif_num); 1908#endif 1909 m_freem(m); 1910 return (IPPROTO_DONE); 1911 } 1912 1913 reghdr = (u_int32_t *)(pim + 1); 1914 1915 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1916 goto pim6_input_to_daemon; 1917 1918 /* 1919 * Validate length 1920 */ 1921 if (pimlen < PIM6_REG_MINLEN) { 1922 ++pim6stat.pim6s_rcv_tooshort; 1923 ++pim6stat.pim6s_rcv_badregisters; 1924#ifdef MRT6DEBUG 1925 log(LOG_ERR, 1926 "pim6_input: register packet size too " 1927 "small %d from %s\n", 1928 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1929#endif 1930 m_freem(m); 1931 return (IPPROTO_DONE); 1932 } 1933 1934 eip6 = (struct ip6_hdr *) (reghdr + 1); 1935#ifdef MRT6DEBUG 1936 if (V_mrt6debug & DEBUG_PIM) 1937 log(LOG_DEBUG, 1938 "pim6_input[register], eip6: %s -> %s, " 1939 "eip6 plen %d\n", 1940 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1941 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1942 ntohs(eip6->ip6_plen)); 1943#endif 1944 1945 /* verify the version number of the inner packet */ 1946 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1947 ++pim6stat.pim6s_rcv_badregisters; 1948#ifdef MRT6DEBUG 1949 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1950 "of the inner packet\n", 1951 (eip6->ip6_vfc & IPV6_VERSION)); 1952#endif 1953 m_freem(m); 1954 return (IPPROTO_NONE); 1955 } 1956 1957 /* verify the inner packet is destined to a mcast group */ 1958 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1959 ++pim6stat.pim6s_rcv_badregisters; 1960#ifdef MRT6DEBUG 1961 if (V_mrt6debug & DEBUG_PIM) 1962 log(LOG_DEBUG, 1963 "pim6_input: inner packet of register " 1964 "is not multicast %s\n", 1965 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1966#endif 1967 m_freem(m); 1968 return (IPPROTO_DONE); 1969 } 1970 1971 /* 1972 * make a copy of the whole header to pass to the daemon later. 1973 */ 1974 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1975 if (mcp == NULL) { 1976#ifdef MRT6DEBUG 1977 log(LOG_ERR, 1978 "pim6_input: pim register: " 1979 "could not copy register head\n"); 1980#endif 1981 m_freem(m); 1982 return (IPPROTO_DONE); 1983 } 1984 1985 /* 1986 * forward the inner ip6 packet; point m_data at the inner ip6. 1987 */ 1988 m_adj(m, off + PIM_MINLEN); 1989#ifdef MRT6DEBUG 1990 if (V_mrt6debug & DEBUG_PIM) { 1991 log(LOG_DEBUG, 1992 "pim6_input: forwarding decapsulated register: " 1993 "src %s, dst %s, mif %d\n", 1994 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1995 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1996 reg_mif_num); 1997 } 1998#endif 1999 2000 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 2001 dst.sin6_family, 0); 2002 2003 /* prepare the register head to send to the mrouting daemon */ 2004 m = mcp; 2005 } 2006 2007 /* 2008 * Pass the PIM message up to the daemon; if it is a register message 2009 * pass the 'head' only up to the daemon. This includes the 2010 * encapsulator ip6 header, pim header, register header and the 2011 * encapsulated ip6 header. 2012 */ 2013 pim6_input_to_daemon: 2014 rip6_input(&m, offp, proto); 2015 return (IPPROTO_DONE); 2016} 2017 2018static int 2019ip6_mroute_modevent(module_t mod, int type, void *unused) 2020{ 2021 2022 switch (type) { 2023 case MOD_LOAD: 2024 MROUTER6_LOCK_INIT(); 2025 MFC6_LOCK_INIT(); 2026 MIF6_LOCK_INIT(); 2027 2028 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 2029 pim6_encapcheck, 2030 (const struct protosw *)&in6_pim_protosw, NULL); 2031 if (pim6_encap_cookie == NULL) { 2032 printf("ip6_mroute: unable to attach pim6 encap\n"); 2033 MIF6_LOCK_DESTROY(); 2034 MFC6_LOCK_DESTROY(); 2035 MROUTER6_LOCK_DESTROY(); 2036 return (EINVAL); 2037 } 2038 2039 ip6_mforward = X_ip6_mforward; 2040 ip6_mrouter_done = X_ip6_mrouter_done; 2041 ip6_mrouter_get = X_ip6_mrouter_get; 2042 ip6_mrouter_set = X_ip6_mrouter_set; 2043 mrt6_ioctl = X_mrt6_ioctl; 2044 break; 2045 2046 case MOD_UNLOAD: 2047 if (V_ip6_mrouter != NULL) 2048 return EINVAL; 2049 2050 if (pim6_encap_cookie) { 2051 encap_detach(pim6_encap_cookie); 2052 pim6_encap_cookie = NULL; 2053 } 2054 X_ip6_mrouter_done(); 2055 ip6_mforward = NULL; 2056 ip6_mrouter_done = NULL; 2057 ip6_mrouter_get = NULL; 2058 ip6_mrouter_set = NULL; 2059 mrt6_ioctl = NULL; 2060 2061 MIF6_LOCK_DESTROY(); 2062 MFC6_LOCK_DESTROY(); 2063 MROUTER6_LOCK_DESTROY(); 2064 break; 2065 2066 default: 2067 return (EOPNOTSUPP); 2068 } 2069 2070 return (0); 2071} 2072 2073static moduledata_t ip6_mroutemod = { 2074 "ip6_mroute", 2075 ip6_mroute_modevent, 2076 0 2077}; 2078 2079DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2080