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("$FreeBSD$"); 83 84 #include "opt_inet6.h" 85 86 #include <sys/param.h> 87 #include <sys/callout.h> 88 #include <sys/errno.h> 89 #include <sys/kernel.h> 90 #include <sys/lock.h> 91 #include <sys/malloc.h> 92 #include <sys/mbuf.h> 93 #include <sys/module.h> 94 #include <sys/domain.h> 95 #include <sys/protosw.h> 96 #include <sys/sdt.h> 97 #include <sys/signalvar.h> 98 #include <sys/socket.h> 99 #include <sys/socketvar.h> 100 #include <sys/sockio.h> 101 #include <sys/sx.h> 102 #include <sys/sysctl.h> 103 #include <sys/syslog.h> 104 #include <sys/systm.h> 105 #include <sys/time.h> 106 107 #include <net/if.h> 108 #include <net/if_var.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/pim6.h> 125 #include <netinet6/pim6_var.h> 126 127 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 128 129 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 130 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 131 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 132 static int set_pim6(int *); 133 static int socket_send(struct socket *, struct mbuf *, 134 struct sockaddr_in6 *); 135 136 extern int in6_mcast_loop; 137 extern struct domain inet6domain; 138 139 static const struct encaptab *pim6_encap_cookie; 140 static const struct protosw in6_pim_protosw = { 141 .pr_type = SOCK_RAW, 142 .pr_domain = &inet6domain, 143 .pr_protocol = IPPROTO_PIM, 144 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 145 .pr_input = pim6_input, 146 .pr_output = rip6_output, 147 .pr_ctloutput = rip6_ctloutput, 148 .pr_usrreqs = &rip6_usrreqs 149 }; 150 static int pim6_encapcheck(const struct mbuf *, int, int, void *); 151 152 static VNET_DEFINE(int, ip6_mrouter_ver) = 0; 153 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 154 155 SYSCTL_DECL(_net_inet6); 156 SYSCTL_DECL(_net_inet6_ip6); 157 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 158 159 static struct mrt6stat mrt6stat; 160 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 161 &mrt6stat, mrt6stat, 162 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 163 164 #define MRT6STAT_INC(name) mrt6stat.name += 1 165 #define NO_RTE_FOUND 0x1 166 #define RTE_FOUND 0x2 167 168 static struct mtx mrouter6_mtx; 169 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 170 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 171 #define MROUTER6_LOCK_ASSERT() do { \ 172 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 173 NET_ASSERT_GIANT(); \ 174 } while (0) 175 #define MROUTER6_LOCK_INIT() \ 176 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 177 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 178 179 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 180 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 181 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 182 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 183 "netinet6/ip6_mroute.h)"); 184 185 static struct mtx mfc6_mtx; 186 #define MFC6_LOCK() mtx_lock(&mfc6_mtx) 187 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 188 #define MFC6_LOCK_ASSERT() do { \ 189 mtx_assert(&mfc6_mtx, MA_OWNED); \ 190 NET_ASSERT_GIANT(); \ 191 } while (0) 192 #define MFC6_LOCK_INIT() \ 193 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 194 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 195 196 static u_char n6expire[MF6CTBLSIZ]; 197 198 static struct mif6 mif6table[MAXMIFS]; 199 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 200 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]", 201 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)"); 202 203 static struct mtx mif6_mtx; 204 #define MIF6_LOCK() mtx_lock(&mif6_mtx) 205 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 206 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 207 #define MIF6_LOCK_INIT() \ 208 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 209 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 210 211 #ifdef MRT6DEBUG 212 static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */ 213 #define V_mrt6debug VNET(mrt6debug) 214 #define DEBUG_MFC 0x02 215 #define DEBUG_FORWARD 0x04 216 #define DEBUG_EXPIRE 0x08 217 #define DEBUG_XMIT 0x10 218 #define DEBUG_REG 0x20 219 #define DEBUG_PIM 0x40 220 #define DEBUG_ERR 0x80 221 #define DEBUG_ANY 0x7f 222 #define MRT6_DLOG(m, fmt, ...) \ 223 if (V_mrt6debug & (m)) \ 224 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 225 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 226 #else 227 #define MRT6_DLOG(m, fmt, ...) 228 #endif 229 230 static void expire_upcalls(void *); 231 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 232 #define UPCALL_EXPIRE 6 /* number of timeouts */ 233 234 /* 235 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 236 */ 237 238 /* 239 * 'Interfaces' associated with decapsulator (so we can tell 240 * packets that went through it from ones that get reflected 241 * by a broken gateway). Different from IPv4 register_if, 242 * these interfaces are linked into the system ifnet list, 243 * because per-interface IPv6 statistics are maintained in 244 * ifp->if_afdata. But it does not have any routes point 245 * to them. I.e., packets can't be sent this way. They 246 * only exist as a placeholder for multicast source 247 * verification. 248 */ 249 static struct ifnet *multicast_register_if6; 250 251 #define ENCAP_HOPS 64 252 253 /* 254 * Private variables. 255 */ 256 static mifi_t nummifs = 0; 257 static mifi_t reg_mif_num = (mifi_t)-1; 258 259 static struct pim6stat pim6stat; 260 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 261 &pim6stat, pim6stat, 262 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 263 264 #define PIM6STAT_INC(name) pim6stat.name += 1 265 static VNET_DEFINE(int, pim6); 266 #define V_pim6 VNET(pim6) 267 268 /* 269 * Hash function for a source, group entry 270 */ 271 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 272 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 273 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 274 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 275 276 /* 277 * Find a route for a given origin IPv6 address and Multicast group address. 278 */ 279 #define MF6CFIND(o, g, rt) do { \ 280 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 281 rt = NULL; \ 282 while (_rt) { \ 283 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 284 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 285 (_rt->mf6c_stall == NULL)) { \ 286 rt = _rt; \ 287 break; \ 288 } \ 289 _rt = _rt->mf6c_next; \ 290 } \ 291 if (rt == NULL) { \ 292 MRT6STAT_INC(mrt6s_mfc_misses); \ 293 } \ 294 } while (/*CONSTCOND*/ 0) 295 296 /* 297 * Macros to compute elapsed time efficiently 298 * Borrowed from Van Jacobson's scheduling code 299 * XXX: replace with timersub() ? 300 */ 301 #define TV_DELTA(a, b, delta) do { \ 302 int xxs; \ 303 \ 304 delta = (a).tv_usec - (b).tv_usec; \ 305 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 306 switch (xxs) { \ 307 case 2: \ 308 delta += 1000000; \ 309 /* FALLTHROUGH */ \ 310 case 1: \ 311 delta += 1000000; \ 312 break; \ 313 default: \ 314 delta += (1000000 * xxs); \ 315 } \ 316 } \ 317 } while (/*CONSTCOND*/ 0) 318 319 /* XXX: replace with timercmp(a, b, <) ? */ 320 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 321 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 322 323 #ifdef UPCALL_TIMING 324 #define UPCALL_MAX 50 325 static u_long upcall_data[UPCALL_MAX + 1]; 326 static void collate(); 327 #endif /* UPCALL_TIMING */ 328 329 static int ip6_mrouter_init(struct socket *, int, int); 330 static int add_m6fc(struct mf6cctl *); 331 static int add_m6if(struct mif6ctl *); 332 static int del_m6fc(struct mf6cctl *); 333 static int del_m6if(mifi_t *); 334 static int del_m6if_locked(mifi_t *); 335 static int get_mif6_cnt(struct sioc_mif_req6 *); 336 static int get_sg_cnt(struct sioc_sg_req6 *); 337 338 static struct callout expire_upcalls_ch; 339 340 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 341 int X_ip6_mrouter_done(void); 342 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 343 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 344 int X_mrt6_ioctl(u_long, caddr_t); 345 346 /* 347 * Handle MRT setsockopt commands to modify the multicast routing tables. 348 */ 349 int 350 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 351 { 352 int error = 0; 353 int optval; 354 struct mif6ctl mifc; 355 struct mf6cctl mfcc; 356 mifi_t mifi; 357 358 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 359 return (EPERM); 360 361 switch (sopt->sopt_name) { 362 case MRT6_INIT: 363 #ifdef MRT6_OINIT 364 case MRT6_OINIT: 365 #endif 366 error = sooptcopyin(sopt, &optval, sizeof(optval), 367 sizeof(optval)); 368 if (error) 369 break; 370 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 371 break; 372 case MRT6_DONE: 373 error = X_ip6_mrouter_done(); 374 break; 375 case MRT6_ADD_MIF: 376 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 377 if (error) 378 break; 379 error = add_m6if(&mifc); 380 break; 381 case MRT6_ADD_MFC: 382 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 383 if (error) 384 break; 385 error = add_m6fc(&mfcc); 386 break; 387 case MRT6_DEL_MFC: 388 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 389 if (error) 390 break; 391 error = del_m6fc(&mfcc); 392 break; 393 case MRT6_DEL_MIF: 394 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 395 if (error) 396 break; 397 error = del_m6if(&mifi); 398 break; 399 case MRT6_PIM: 400 error = sooptcopyin(sopt, &optval, sizeof(optval), 401 sizeof(optval)); 402 if (error) 403 break; 404 error = set_pim6(&optval); 405 break; 406 default: 407 error = EOPNOTSUPP; 408 break; 409 } 410 411 return (error); 412 } 413 414 /* 415 * Handle MRT getsockopt commands 416 */ 417 int 418 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 419 { 420 int error = 0; 421 422 if (so != V_ip6_mrouter) 423 return (EACCES); 424 425 switch (sopt->sopt_name) { 426 case MRT6_PIM: 427 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 428 break; 429 } 430 return (error); 431 } 432 433 /* 434 * Handle ioctl commands to obtain information from the cache 435 */ 436 int 437 X_mrt6_ioctl(u_long cmd, caddr_t data) 438 { 439 int ret; 440 441 ret = EINVAL; 442 443 switch (cmd) { 444 case SIOCGETSGCNT_IN6: 445 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 446 break; 447 448 case SIOCGETMIFCNT_IN6: 449 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 450 break; 451 452 default: 453 break; 454 } 455 456 return (ret); 457 } 458 459 /* 460 * returns the packet, byte, rpf-failure count for the source group provided 461 */ 462 static int 463 get_sg_cnt(struct sioc_sg_req6 *req) 464 { 465 struct mf6c *rt; 466 int ret; 467 468 ret = 0; 469 470 MFC6_LOCK(); 471 472 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 473 if (rt == NULL) { 474 ret = ESRCH; 475 } else { 476 req->pktcnt = rt->mf6c_pkt_cnt; 477 req->bytecnt = rt->mf6c_byte_cnt; 478 req->wrong_if = rt->mf6c_wrong_if; 479 } 480 481 MFC6_UNLOCK(); 482 483 return (ret); 484 } 485 486 /* 487 * returns the input and output packet and byte counts on the mif provided 488 */ 489 static int 490 get_mif6_cnt(struct sioc_mif_req6 *req) 491 { 492 mifi_t mifi; 493 int ret; 494 495 ret = 0; 496 mifi = req->mifi; 497 498 MIF6_LOCK(); 499 500 if (mifi >= nummifs) { 501 ret = EINVAL; 502 } else { 503 req->icount = mif6table[mifi].m6_pkt_in; 504 req->ocount = mif6table[mifi].m6_pkt_out; 505 req->ibytes = mif6table[mifi].m6_bytes_in; 506 req->obytes = mif6table[mifi].m6_bytes_out; 507 } 508 509 MIF6_UNLOCK(); 510 511 return (ret); 512 } 513 514 static int 515 set_pim6(int *i) 516 { 517 if ((*i != 1) && (*i != 0)) 518 return (EINVAL); 519 520 V_pim6 = *i; 521 522 return (0); 523 } 524 525 /* 526 * Enable multicast routing 527 */ 528 static int 529 ip6_mrouter_init(struct socket *so, int v, int cmd) 530 { 531 532 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 533 so->so_type, so->so_proto->pr_protocol); 534 535 if (so->so_type != SOCK_RAW || 536 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 537 return (EOPNOTSUPP); 538 539 if (v != 1) 540 return (ENOPROTOOPT); 541 542 MROUTER6_LOCK(); 543 544 if (V_ip6_mrouter != NULL) { 545 MROUTER6_UNLOCK(); 546 return (EADDRINUSE); 547 } 548 549 V_ip6_mrouter = so; 550 V_ip6_mrouter_ver = cmd; 551 552 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 553 bzero((caddr_t)n6expire, sizeof(n6expire)); 554 555 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 556 557 callout_init(&expire_upcalls_ch, 0); 558 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 559 expire_upcalls, NULL); 560 561 MROUTER6_UNLOCK(); 562 MRT6_DLOG(DEBUG_ANY, "finished"); 563 564 return (0); 565 } 566 567 /* 568 * Disable IPv6 multicast forwarding. 569 */ 570 int 571 X_ip6_mrouter_done(void) 572 { 573 mifi_t mifi; 574 u_long i; 575 struct mf6c *rt; 576 struct rtdetq *rte; 577 578 MROUTER6_LOCK(); 579 580 if (V_ip6_mrouter == NULL) { 581 MROUTER6_UNLOCK(); 582 return (EINVAL); 583 } 584 585 /* 586 * For each phyint in use, disable promiscuous reception of all IPv6 587 * multicasts. 588 */ 589 for (mifi = 0; mifi < nummifs; mifi++) { 590 if (mif6table[mifi].m6_ifp && 591 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 592 if_allmulti(mif6table[mifi].m6_ifp, 0); 593 } 594 } 595 bzero((caddr_t)mif6table, sizeof(mif6table)); 596 nummifs = 0; 597 598 V_pim6 = 0; /* used to stub out/in pim specific code */ 599 600 callout_stop(&expire_upcalls_ch); 601 602 /* 603 * Free all multicast forwarding cache entries. 604 */ 605 MFC6_LOCK(); 606 for (i = 0; i < MF6CTBLSIZ; i++) { 607 rt = mf6ctable[i]; 608 while (rt) { 609 struct mf6c *frt; 610 611 for (rte = rt->mf6c_stall; rte != NULL; ) { 612 struct rtdetq *n = rte->next; 613 614 m_freem(rte->m); 615 free(rte, M_MRTABLE6); 616 rte = n; 617 } 618 frt = rt; 619 rt = rt->mf6c_next; 620 free(frt, M_MRTABLE6); 621 } 622 } 623 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 624 MFC6_UNLOCK(); 625 626 /* 627 * Reset register interface 628 */ 629 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 630 if_detach(multicast_register_if6); 631 if_free(multicast_register_if6); 632 reg_mif_num = (mifi_t)-1; 633 multicast_register_if6 = NULL; 634 } 635 636 V_ip6_mrouter = NULL; 637 V_ip6_mrouter_ver = 0; 638 639 MROUTER6_UNLOCK(); 640 MRT6_DLOG(DEBUG_ANY, "finished"); 641 642 return (0); 643 } 644 645 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 646 647 /* 648 * Add a mif to the mif table 649 */ 650 static int 651 add_m6if(struct mif6ctl *mifcp) 652 { 653 struct mif6 *mifp; 654 struct ifnet *ifp; 655 int error; 656 657 MIF6_LOCK(); 658 659 if (mifcp->mif6c_mifi >= MAXMIFS) { 660 MIF6_UNLOCK(); 661 return (EINVAL); 662 } 663 mifp = mif6table + mifcp->mif6c_mifi; 664 if (mifp->m6_ifp != NULL) { 665 MIF6_UNLOCK(); 666 return (EADDRINUSE); /* XXX: is it appropriate? */ 667 } 668 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 669 MIF6_UNLOCK(); 670 return (ENXIO); 671 } 672 673 ifp = ifnet_byindex(mifcp->mif6c_pifi); 674 675 if (mifcp->mif6c_flags & MIFF_REGISTER) { 676 if (reg_mif_num == (mifi_t)-1) { 677 ifp = if_alloc(IFT_OTHER); 678 679 if_initname(ifp, "register_mif", 0); 680 ifp->if_flags |= IFF_LOOPBACK; 681 if_attach(ifp); 682 multicast_register_if6 = ifp; 683 reg_mif_num = mifcp->mif6c_mifi; 684 /* 685 * it is impossible to guess the ifindex of the 686 * register interface. So mif6c_pifi is automatically 687 * calculated. 688 */ 689 mifcp->mif6c_pifi = ifp->if_index; 690 } else { 691 ifp = multicast_register_if6; 692 } 693 } else { 694 /* Make sure the interface supports multicast */ 695 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 696 MIF6_UNLOCK(); 697 return (EOPNOTSUPP); 698 } 699 700 error = if_allmulti(ifp, 1); 701 if (error) { 702 MIF6_UNLOCK(); 703 return (error); 704 } 705 } 706 707 mifp->m6_flags = mifcp->mif6c_flags; 708 mifp->m6_ifp = ifp; 709 710 /* initialize per mif pkt counters */ 711 mifp->m6_pkt_in = 0; 712 mifp->m6_pkt_out = 0; 713 mifp->m6_bytes_in = 0; 714 mifp->m6_bytes_out = 0; 715 716 /* Adjust nummifs up if the mifi is higher than nummifs */ 717 if (nummifs <= mifcp->mif6c_mifi) 718 nummifs = mifcp->mif6c_mifi + 1; 719 720 MIF6_UNLOCK(); 721 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 722 if_name(ifp)); 723 724 return (0); 725 } 726 727 /* 728 * Delete a mif from the mif table 729 */ 730 static int 731 del_m6if_locked(mifi_t *mifip) 732 { 733 struct mif6 *mifp = mif6table + *mifip; 734 mifi_t mifi; 735 struct ifnet *ifp; 736 737 MIF6_LOCK_ASSERT(); 738 739 if (*mifip >= nummifs) 740 return (EINVAL); 741 if (mifp->m6_ifp == NULL) 742 return (EINVAL); 743 744 if (!(mifp->m6_flags & MIFF_REGISTER)) { 745 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 746 ifp = mifp->m6_ifp; 747 if_allmulti(ifp, 0); 748 } else { 749 if (reg_mif_num != (mifi_t)-1 && 750 multicast_register_if6 != NULL) { 751 if_detach(multicast_register_if6); 752 if_free(multicast_register_if6); 753 reg_mif_num = (mifi_t)-1; 754 multicast_register_if6 = NULL; 755 } 756 } 757 758 bzero((caddr_t)mifp, sizeof(*mifp)); 759 760 /* Adjust nummifs down */ 761 for (mifi = nummifs; mifi > 0; mifi--) 762 if (mif6table[mifi - 1].m6_ifp) 763 break; 764 nummifs = mifi; 765 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 766 767 return (0); 768 } 769 770 static int 771 del_m6if(mifi_t *mifip) 772 { 773 int cc; 774 775 MIF6_LOCK(); 776 cc = del_m6if_locked(mifip); 777 MIF6_UNLOCK(); 778 779 return (cc); 780 } 781 782 /* 783 * Add an mfc entry 784 */ 785 static int 786 add_m6fc(struct mf6cctl *mfccp) 787 { 788 struct mf6c *rt; 789 u_long hash; 790 struct rtdetq *rte; 791 u_short nstl; 792 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 793 794 MFC6_LOCK(); 795 796 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 797 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 798 799 /* If an entry already exists, just update the fields */ 800 if (rt) { 801 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 802 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 803 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 804 mfccp->mf6cc_parent); 805 806 rt->mf6c_parent = mfccp->mf6cc_parent; 807 rt->mf6c_ifset = mfccp->mf6cc_ifset; 808 809 MFC6_UNLOCK(); 810 return (0); 811 } 812 813 /* 814 * Find the entry for which the upcall was made and update 815 */ 816 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 817 mfccp->mf6cc_mcastgrp.sin6_addr); 818 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 819 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 820 &mfccp->mf6cc_origin.sin6_addr) && 821 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 822 &mfccp->mf6cc_mcastgrp.sin6_addr) && 823 (rt->mf6c_stall != NULL)) { 824 825 if (nstl++) 826 log(LOG_ERR, 827 "add_m6fc: %s o %s g %s p %x dbx %p\n", 828 "multiple kernel entries", 829 ip6_sprintf(ip6bufo, 830 &mfccp->mf6cc_origin.sin6_addr), 831 ip6_sprintf(ip6bufg, 832 &mfccp->mf6cc_mcastgrp.sin6_addr), 833 mfccp->mf6cc_parent, rt->mf6c_stall); 834 835 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 836 ip6_sprintf(ip6bufo, 837 &mfccp->mf6cc_origin.sin6_addr), 838 ip6_sprintf(ip6bufg, 839 &mfccp->mf6cc_mcastgrp.sin6_addr), 840 mfccp->mf6cc_parent, rt->mf6c_stall); 841 842 rt->mf6c_origin = mfccp->mf6cc_origin; 843 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 844 rt->mf6c_parent = mfccp->mf6cc_parent; 845 rt->mf6c_ifset = mfccp->mf6cc_ifset; 846 /* initialize pkt counters per src-grp */ 847 rt->mf6c_pkt_cnt = 0; 848 rt->mf6c_byte_cnt = 0; 849 rt->mf6c_wrong_if = 0; 850 851 rt->mf6c_expire = 0; /* Don't clean this guy up */ 852 n6expire[hash]--; 853 854 /* free packets Qed at the end of this entry */ 855 for (rte = rt->mf6c_stall; rte != NULL; ) { 856 struct rtdetq *n = rte->next; 857 ip6_mdq(rte->m, rte->ifp, rt); 858 m_freem(rte->m); 859 #ifdef UPCALL_TIMING 860 collate(&(rte->t)); 861 #endif /* UPCALL_TIMING */ 862 free(rte, M_MRTABLE6); 863 rte = n; 864 } 865 rt->mf6c_stall = NULL; 866 } 867 } 868 869 /* 870 * It is possible that an entry is being inserted without an upcall 871 */ 872 if (nstl == 0) { 873 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 874 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 875 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 876 mfccp->mf6cc_parent); 877 878 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 879 880 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 881 &mfccp->mf6cc_origin.sin6_addr)&& 882 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 883 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 884 885 rt->mf6c_origin = mfccp->mf6cc_origin; 886 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 887 rt->mf6c_parent = mfccp->mf6cc_parent; 888 rt->mf6c_ifset = mfccp->mf6cc_ifset; 889 /* initialize pkt counters per src-grp */ 890 rt->mf6c_pkt_cnt = 0; 891 rt->mf6c_byte_cnt = 0; 892 rt->mf6c_wrong_if = 0; 893 894 if (rt->mf6c_expire) 895 n6expire[hash]--; 896 rt->mf6c_expire = 0; 897 } 898 } 899 if (rt == NULL) { 900 /* no upcall, so make a new entry */ 901 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 902 M_NOWAIT); 903 if (rt == NULL) { 904 MFC6_UNLOCK(); 905 return (ENOBUFS); 906 } 907 908 /* insert new entry at head of hash chain */ 909 rt->mf6c_origin = mfccp->mf6cc_origin; 910 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 911 rt->mf6c_parent = mfccp->mf6cc_parent; 912 rt->mf6c_ifset = mfccp->mf6cc_ifset; 913 /* initialize pkt counters per src-grp */ 914 rt->mf6c_pkt_cnt = 0; 915 rt->mf6c_byte_cnt = 0; 916 rt->mf6c_wrong_if = 0; 917 rt->mf6c_expire = 0; 918 rt->mf6c_stall = NULL; 919 920 /* link into table */ 921 rt->mf6c_next = mf6ctable[hash]; 922 mf6ctable[hash] = rt; 923 } 924 } 925 926 MFC6_UNLOCK(); 927 return (0); 928 } 929 930 #ifdef UPCALL_TIMING 931 /* 932 * collect delay statistics on the upcalls 933 */ 934 static void 935 collate(struct timeval *t) 936 { 937 u_long d; 938 struct timeval tp; 939 u_long delta; 940 941 GET_TIME(tp); 942 943 if (TV_LT(*t, tp)) 944 { 945 TV_DELTA(tp, *t, delta); 946 947 d = delta >> 10; 948 if (d > UPCALL_MAX) 949 d = UPCALL_MAX; 950 951 ++upcall_data[d]; 952 } 953 } 954 #endif /* UPCALL_TIMING */ 955 956 /* 957 * Delete an mfc entry 958 */ 959 static int 960 del_m6fc(struct mf6cctl *mfccp) 961 { 962 #ifdef MRT6DEBUG 963 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 964 #endif 965 struct sockaddr_in6 origin; 966 struct sockaddr_in6 mcastgrp; 967 struct mf6c *rt; 968 struct mf6c **nptr; 969 u_long hash; 970 971 origin = mfccp->mf6cc_origin; 972 mcastgrp = mfccp->mf6cc_mcastgrp; 973 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 974 975 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 976 ip6_sprintf(ip6bufo, &origin.sin6_addr), 977 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 978 979 MFC6_LOCK(); 980 981 nptr = &mf6ctable[hash]; 982 while ((rt = *nptr) != NULL) { 983 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 984 &rt->mf6c_origin.sin6_addr) && 985 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 986 &rt->mf6c_mcastgrp.sin6_addr) && 987 rt->mf6c_stall == NULL) 988 break; 989 990 nptr = &rt->mf6c_next; 991 } 992 if (rt == NULL) { 993 MFC6_UNLOCK(); 994 return (EADDRNOTAVAIL); 995 } 996 997 *nptr = rt->mf6c_next; 998 free(rt, M_MRTABLE6); 999 1000 MFC6_UNLOCK(); 1001 1002 return (0); 1003 } 1004 1005 static int 1006 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1007 { 1008 1009 if (s) { 1010 if (sbappendaddr(&s->so_rcv, 1011 (struct sockaddr *)src, 1012 mm, (struct mbuf *)0) != 0) { 1013 sorwakeup(s); 1014 return (0); 1015 } 1016 } 1017 m_freem(mm); 1018 return (-1); 1019 } 1020 1021 /* 1022 * IPv6 multicast forwarding function. This function assumes that the packet 1023 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1024 * pointed to by "ifp", and the packet is to be relayed to other networks 1025 * that have members of the packet's destination IPv6 multicast group. 1026 * 1027 * The packet is returned unscathed to the caller, unless it is 1028 * erroneous, in which case a non-zero return value tells the caller to 1029 * discard it. 1030 * 1031 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1032 * this function is called in the originating context (i.e., not when 1033 * forwarding a packet from other node). ip6_output(), which is currently the 1034 * only function that calls this function is called in the originating context, 1035 * explicitly ensures this condition. It is caller's responsibility to ensure 1036 * that if this function is called from somewhere else in the originating 1037 * context in the future. 1038 */ 1039 int 1040 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1041 { 1042 struct rtdetq *rte; 1043 struct mbuf *mb0; 1044 struct mf6c *rt; 1045 struct mif6 *mifp; 1046 struct mbuf *mm; 1047 u_long hash; 1048 mifi_t mifi; 1049 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1050 #ifdef UPCALL_TIMING 1051 struct timeval tp; 1052 1053 GET_TIME(tp); 1054 #endif /* UPCALL_TIMING */ 1055 1056 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1057 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1058 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1059 1060 /* 1061 * Don't forward a packet with Hop limit of zero or one, 1062 * or a packet destined to a local-only group. 1063 */ 1064 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1065 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1066 return (0); 1067 ip6->ip6_hlim--; 1068 1069 /* 1070 * Source address check: do not forward packets with unspecified 1071 * source. It was discussed in July 2000, on ipngwg mailing list. 1072 * This is rather more serious than unicast cases, because some 1073 * MLD packets can be sent with the unspecified source address 1074 * (although such packets must normally set 1 to the hop limit field). 1075 */ 1076 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1077 IP6STAT_INC(ip6s_cantforward); 1078 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1079 V_ip6_log_time = time_uptime; 1080 log(LOG_DEBUG, 1081 "cannot forward " 1082 "from %s to %s nxt %d received on %s\n", 1083 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1085 ip6->ip6_nxt, 1086 if_name(m->m_pkthdr.rcvif)); 1087 } 1088 return (0); 1089 } 1090 1091 MFC6_LOCK(); 1092 1093 /* 1094 * Determine forwarding mifs from the forwarding cache table 1095 */ 1096 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1097 MRT6STAT_INC(mrt6s_mfc_lookups); 1098 1099 /* Entry exists, so forward if necessary */ 1100 if (rt) { 1101 MFC6_UNLOCK(); 1102 return (ip6_mdq(m, ifp, rt)); 1103 } 1104 1105 /* 1106 * If we don't have a route for packet's origin, 1107 * Make a copy of the packet & send message to routing daemon. 1108 */ 1109 MRT6STAT_INC(mrt6s_no_route); 1110 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1111 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1112 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1113 1114 /* 1115 * Allocate mbufs early so that we don't do extra work if we 1116 * are just going to fail anyway. 1117 */ 1118 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1119 if (rte == NULL) { 1120 MFC6_UNLOCK(); 1121 return (ENOBUFS); 1122 } 1123 mb0 = m_copy(m, 0, M_COPYALL); 1124 /* 1125 * Pullup packet header if needed before storing it, 1126 * as other references may modify it in the meantime. 1127 */ 1128 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1129 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1130 if (mb0 == NULL) { 1131 free(rte, M_MRTABLE6); 1132 MFC6_UNLOCK(); 1133 return (ENOBUFS); 1134 } 1135 1136 /* is there an upcall waiting for this packet? */ 1137 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1138 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1139 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1140 &rt->mf6c_origin.sin6_addr) && 1141 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1142 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1143 break; 1144 } 1145 1146 if (rt == NULL) { 1147 struct mrt6msg *im; 1148 #ifdef MRT6_OINIT 1149 struct omrt6msg *oim; 1150 #endif 1151 /* no upcall, so make a new entry */ 1152 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1153 if (rt == NULL) { 1154 free(rte, M_MRTABLE6); 1155 m_freem(mb0); 1156 MFC6_UNLOCK(); 1157 return (ENOBUFS); 1158 } 1159 /* 1160 * Make a copy of the header to send to the user 1161 * level process 1162 */ 1163 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1164 if (mm == NULL) { 1165 free(rte, M_MRTABLE6); 1166 m_freem(mb0); 1167 free(rt, M_MRTABLE6); 1168 MFC6_UNLOCK(); 1169 return (ENOBUFS); 1170 } 1171 1172 /* 1173 * Send message to routing daemon 1174 */ 1175 sin6.sin6_addr = ip6->ip6_src; 1176 im = NULL; 1177 #ifdef MRT6_OINIT 1178 oim = NULL; 1179 #endif 1180 switch (V_ip6_mrouter_ver) { 1181 #ifdef MRT6_OINIT 1182 case MRT6_OINIT: 1183 oim = mtod(mm, struct omrt6msg *); 1184 oim->im6_msgtype = MRT6MSG_NOCACHE; 1185 oim->im6_mbz = 0; 1186 break; 1187 #endif 1188 case MRT6_INIT: 1189 im = mtod(mm, struct mrt6msg *); 1190 im->im6_msgtype = MRT6MSG_NOCACHE; 1191 im->im6_mbz = 0; 1192 break; 1193 default: 1194 free(rte, M_MRTABLE6); 1195 m_freem(mb0); 1196 free(rt, M_MRTABLE6); 1197 MFC6_UNLOCK(); 1198 return (EINVAL); 1199 } 1200 1201 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1202 for (mifp = mif6table, mifi = 0; 1203 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1204 ; 1205 1206 switch (V_ip6_mrouter_ver) { 1207 #ifdef MRT6_OINIT 1208 case MRT6_OINIT: 1209 oim->im6_mif = mifi; 1210 break; 1211 #endif 1212 case MRT6_INIT: 1213 im->im6_mif = mifi; 1214 break; 1215 } 1216 1217 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1218 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1219 "socket queue full\n"); 1220 MRT6STAT_INC(mrt6s_upq_sockfull); 1221 free(rte, M_MRTABLE6); 1222 m_freem(mb0); 1223 free(rt, M_MRTABLE6); 1224 MFC6_UNLOCK(); 1225 return (ENOBUFS); 1226 } 1227 1228 MRT6STAT_INC(mrt6s_upcalls); 1229 1230 /* insert new entry at head of hash chain */ 1231 bzero(rt, sizeof(*rt)); 1232 rt->mf6c_origin.sin6_family = AF_INET6; 1233 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1234 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1235 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1236 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1237 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1238 rt->mf6c_expire = UPCALL_EXPIRE; 1239 n6expire[hash]++; 1240 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1241 1242 /* link into table */ 1243 rt->mf6c_next = mf6ctable[hash]; 1244 mf6ctable[hash] = rt; 1245 /* Add this entry to the end of the queue */ 1246 rt->mf6c_stall = rte; 1247 } else { 1248 /* determine if q has overflowed */ 1249 struct rtdetq **p; 1250 int npkts = 0; 1251 1252 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1253 if (++npkts > MAX_UPQ6) { 1254 MRT6STAT_INC(mrt6s_upq_ovflw); 1255 free(rte, M_MRTABLE6); 1256 m_freem(mb0); 1257 MFC6_UNLOCK(); 1258 return (0); 1259 } 1260 1261 /* Add this entry to the end of the queue */ 1262 *p = rte; 1263 } 1264 1265 rte->next = NULL; 1266 rte->m = mb0; 1267 rte->ifp = ifp; 1268 #ifdef UPCALL_TIMING 1269 rte->t = tp; 1270 #endif /* UPCALL_TIMING */ 1271 1272 MFC6_UNLOCK(); 1273 1274 return (0); 1275 } 1276 1277 /* 1278 * Clean up cache entries if upcalls are not serviced 1279 * Call from the Slow Timeout mechanism, every half second. 1280 */ 1281 static void 1282 expire_upcalls(void *unused) 1283 { 1284 #ifdef MRT6DEBUG 1285 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1286 #endif 1287 struct rtdetq *rte; 1288 struct mf6c *mfc, **nptr; 1289 u_long i; 1290 1291 MFC6_LOCK(); 1292 for (i = 0; i < MF6CTBLSIZ; i++) { 1293 if (n6expire[i] == 0) 1294 continue; 1295 nptr = &mf6ctable[i]; 1296 while ((mfc = *nptr) != NULL) { 1297 rte = mfc->mf6c_stall; 1298 /* 1299 * Skip real cache entries 1300 * Make sure it wasn't marked to not expire (shouldn't happen) 1301 * If it expires now 1302 */ 1303 if (rte != NULL && 1304 mfc->mf6c_expire != 0 && 1305 --mfc->mf6c_expire == 0) { 1306 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1307 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1308 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1309 /* 1310 * drop all the packets 1311 * free the mbuf with the pkt, if, timing info 1312 */ 1313 do { 1314 struct rtdetq *n = rte->next; 1315 m_freem(rte->m); 1316 free(rte, M_MRTABLE6); 1317 rte = n; 1318 } while (rte != NULL); 1319 MRT6STAT_INC(mrt6s_cache_cleanups); 1320 n6expire[i]--; 1321 1322 *nptr = mfc->mf6c_next; 1323 free(mfc, M_MRTABLE6); 1324 } else { 1325 nptr = &mfc->mf6c_next; 1326 } 1327 } 1328 } 1329 MFC6_UNLOCK(); 1330 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1331 expire_upcalls, NULL); 1332 } 1333 1334 /* 1335 * Packet forwarding routine once entry in the cache is made 1336 */ 1337 static int 1338 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1339 { 1340 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1341 mifi_t mifi, iif; 1342 struct mif6 *mifp; 1343 int plen = m->m_pkthdr.len; 1344 struct in6_addr src0, dst0; /* copies for local work */ 1345 u_int32_t iszone, idzone, oszone, odzone; 1346 int error = 0; 1347 1348 /* 1349 * Macro to send packet on mif. Since RSVP packets don't get counted on 1350 * input, they shouldn't get counted on output, so statistics keeping is 1351 * separate. 1352 */ 1353 1354 #define MC6_SEND(ip6, mifp, m) do { \ 1355 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1356 register_send((ip6), (mifp), (m)); \ 1357 else \ 1358 phyint_send((ip6), (mifp), (m)); \ 1359 } while (/*CONSTCOND*/ 0) 1360 1361 /* 1362 * Don't forward if it didn't arrive from the parent mif 1363 * for its origin. 1364 */ 1365 mifi = rt->mf6c_parent; 1366 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1367 /* came in the wrong interface */ 1368 MRT6_DLOG(DEBUG_FORWARD, 1369 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1370 mifi, mif6table[mifi].m6_ifp->if_index); 1371 MRT6STAT_INC(mrt6s_wrong_if); 1372 rt->mf6c_wrong_if++; 1373 /* 1374 * If we are doing PIM processing, and we are forwarding 1375 * packets on this interface, send a message to the 1376 * routing daemon. 1377 */ 1378 /* have to make sure this is a valid mif */ 1379 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1380 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1381 /* 1382 * Check the M_LOOP flag to avoid an 1383 * unnecessary PIM assert. 1384 * XXX: M_LOOP is an ad-hoc hack... 1385 */ 1386 static struct sockaddr_in6 sin6 = 1387 { sizeof(sin6), AF_INET6 }; 1388 1389 struct mbuf *mm; 1390 struct mrt6msg *im; 1391 #ifdef MRT6_OINIT 1392 struct omrt6msg *oim; 1393 #endif 1394 1395 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1396 if (mm && 1397 (!M_WRITABLE(mm) || 1398 mm->m_len < sizeof(struct ip6_hdr))) 1399 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1400 if (mm == NULL) 1401 return (ENOBUFS); 1402 1403 #ifdef MRT6_OINIT 1404 oim = NULL; 1405 #endif 1406 im = NULL; 1407 switch (V_ip6_mrouter_ver) { 1408 #ifdef MRT6_OINIT 1409 case MRT6_OINIT: 1410 oim = mtod(mm, struct omrt6msg *); 1411 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1412 oim->im6_mbz = 0; 1413 break; 1414 #endif 1415 case MRT6_INIT: 1416 im = mtod(mm, struct mrt6msg *); 1417 im->im6_msgtype = MRT6MSG_WRONGMIF; 1418 im->im6_mbz = 0; 1419 break; 1420 default: 1421 m_freem(mm); 1422 return (EINVAL); 1423 } 1424 1425 for (mifp = mif6table, iif = 0; 1426 iif < nummifs && mifp && 1427 mifp->m6_ifp != ifp; 1428 mifp++, iif++) 1429 ; 1430 1431 switch (V_ip6_mrouter_ver) { 1432 #ifdef MRT6_OINIT 1433 case MRT6_OINIT: 1434 oim->im6_mif = iif; 1435 sin6.sin6_addr = oim->im6_src; 1436 break; 1437 #endif 1438 case MRT6_INIT: 1439 im->im6_mif = iif; 1440 sin6.sin6_addr = im->im6_src; 1441 break; 1442 } 1443 1444 MRT6STAT_INC(mrt6s_upcalls); 1445 1446 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1447 MRT6_DLOG(DEBUG_ANY, 1448 "ip6_mrouter socket queue full"); 1449 MRT6STAT_INC(mrt6s_upq_sockfull); 1450 return (ENOBUFS); 1451 } /* if socket Q full */ 1452 } /* if PIM */ 1453 return (0); 1454 } /* if wrong iif */ 1455 1456 /* If I sourced this packet, it counts as output, else it was input. */ 1457 if (m->m_pkthdr.rcvif == NULL) { 1458 /* XXX: is rcvif really NULL when output?? */ 1459 mif6table[mifi].m6_pkt_out++; 1460 mif6table[mifi].m6_bytes_out += plen; 1461 } else { 1462 mif6table[mifi].m6_pkt_in++; 1463 mif6table[mifi].m6_bytes_in += plen; 1464 } 1465 rt->mf6c_pkt_cnt++; 1466 rt->mf6c_byte_cnt += plen; 1467 1468 /* 1469 * For each mif, forward a copy of the packet if there are group 1470 * members downstream on the interface. 1471 */ 1472 src0 = ip6->ip6_src; 1473 dst0 = ip6->ip6_dst; 1474 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1475 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1476 IP6STAT_INC(ip6s_badscope); 1477 return (error); 1478 } 1479 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1480 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1481 /* 1482 * check if the outgoing packet is going to break 1483 * a scope boundary. 1484 * XXX For packets through PIM register tunnel 1485 * interface, we believe a routing daemon. 1486 */ 1487 if (!(mif6table[rt->mf6c_parent].m6_flags & 1488 MIFF_REGISTER) && 1489 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1490 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1491 &oszone) || 1492 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1493 &odzone) || 1494 iszone != oszone || 1495 idzone != odzone) { 1496 IP6STAT_INC(ip6s_badscope); 1497 continue; 1498 } 1499 } 1500 1501 mifp->m6_pkt_out++; 1502 mifp->m6_bytes_out += plen; 1503 MC6_SEND(ip6, mifp, m); 1504 } 1505 } 1506 return (0); 1507 } 1508 1509 static void 1510 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1511 { 1512 #ifdef MRT6DEBUG 1513 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1514 #endif 1515 struct mbuf *mb_copy; 1516 struct ifnet *ifp = mifp->m6_ifp; 1517 int error = 0; 1518 u_long linkmtu; 1519 1520 /* 1521 * Make a new reference to the packet; make sure that 1522 * the IPv6 header is actually copied, not just referenced, 1523 * so that ip6_output() only scribbles on the copy. 1524 */ 1525 mb_copy = m_copy(m, 0, M_COPYALL); 1526 if (mb_copy && 1527 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1528 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1529 if (mb_copy == NULL) { 1530 return; 1531 } 1532 /* set MCAST flag to the outgoing packet */ 1533 mb_copy->m_flags |= M_MCAST; 1534 1535 /* 1536 * If we sourced the packet, call ip6_output since we may devide 1537 * the packet into fragments when the packet is too big for the 1538 * outgoing interface. 1539 * Otherwise, we can simply send the packet to the interface 1540 * sending queue. 1541 */ 1542 if (m->m_pkthdr.rcvif == NULL) { 1543 struct ip6_moptions im6o; 1544 1545 im6o.im6o_multicast_ifp = ifp; 1546 /* XXX: ip6_output will override ip6->ip6_hlim */ 1547 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1548 im6o.im6o_multicast_loop = 1; 1549 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1550 NULL, NULL); 1551 1552 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1553 (uint16_t)(mifp - mif6table), error); 1554 return; 1555 } 1556 1557 /* 1558 * If configured to loop back multicasts by default, 1559 * loop back a copy now. 1560 */ 1561 if (in6_mcast_loop) { 1562 struct sockaddr_in6 dst6; 1563 1564 bzero(&dst6, sizeof(dst6)); 1565 dst6.sin6_len = sizeof(struct sockaddr_in6); 1566 dst6.sin6_family = AF_INET6; 1567 dst6.sin6_addr = ip6->ip6_dst; 1568 ip6_mloopback(ifp, m, &dst6); 1569 } 1570 1571 /* 1572 * Put the packet into the sending queue of the outgoing interface 1573 * if it would fit in the MTU of the interface. 1574 */ 1575 linkmtu = IN6_LINKMTU(ifp); 1576 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1577 struct sockaddr_in6 dst6; 1578 1579 bzero(&dst6, sizeof(dst6)); 1580 dst6.sin6_len = sizeof(struct sockaddr_in6); 1581 dst6.sin6_family = AF_INET6; 1582 dst6.sin6_addr = ip6->ip6_dst; 1583 1584 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1585 /* 1586 * We just call if_output instead of nd6_output here, since 1587 * we need no ND for a multicast forwarded packet...right? 1588 */ 1589 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1590 error = (*ifp->if_output)(ifp, mb_copy, 1591 (struct sockaddr *)&dst6, NULL); 1592 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1593 (uint16_t)(mifp - mif6table), error); 1594 } else { 1595 /* 1596 * pMTU discovery is intentionally disabled by default, since 1597 * various router may notify pMTU in multicast, which can be 1598 * a DDoS to a router 1599 */ 1600 if (V_ip6_mcast_pmtu) 1601 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1602 else { 1603 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1604 "g %s size %d (discarded)", if_name(ifp), 1605 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1606 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1607 mb_copy->m_pkthdr.len); 1608 m_freem(mb_copy); /* simply discard the packet */ 1609 } 1610 } 1611 } 1612 1613 static int 1614 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1615 { 1616 #ifdef MRT6DEBUG 1617 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1618 #endif 1619 struct mbuf *mm; 1620 int i, len = m->m_pkthdr.len; 1621 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1622 struct mrt6msg *im6; 1623 1624 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1625 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1626 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1627 PIM6STAT_INC(pim6s_snd_registers); 1628 1629 /* Make a copy of the packet to send to the user level process. */ 1630 mm = m_gethdr(M_NOWAIT, MT_DATA); 1631 if (mm == NULL) 1632 return (ENOBUFS); 1633 mm->m_data += max_linkhdr; 1634 mm->m_len = sizeof(struct ip6_hdr); 1635 1636 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1637 m_freem(mm); 1638 return (ENOBUFS); 1639 } 1640 i = MHLEN - M_LEADINGSPACE(mm); 1641 if (i > len) 1642 i = len; 1643 mm = m_pullup(mm, i); 1644 if (mm == NULL) 1645 return (ENOBUFS); 1646 /* TODO: check it! */ 1647 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1648 1649 /* 1650 * Send message to routing daemon 1651 */ 1652 sin6.sin6_addr = ip6->ip6_src; 1653 1654 im6 = mtod(mm, struct mrt6msg *); 1655 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1656 im6->im6_mbz = 0; 1657 1658 im6->im6_mif = mif - mif6table; 1659 1660 /* iif info is not given for reg. encap.n */ 1661 MRT6STAT_INC(mrt6s_upcalls); 1662 1663 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1664 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1665 MRT6STAT_INC(mrt6s_upq_sockfull); 1666 return (ENOBUFS); 1667 } 1668 return (0); 1669 } 1670 1671 /* 1672 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1673 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1674 * into the kernel. 1675 */ 1676 static int 1677 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1678 { 1679 1680 #ifdef DIAGNOSTIC 1681 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1682 #endif 1683 if (proto != IPPROTO_PIM) 1684 return 0; /* not for us; reject the datagram. */ 1685 1686 return 64; /* claim the datagram. */ 1687 } 1688 1689 /* 1690 * PIM sparse mode hook 1691 * Receives the pim control messages, and passes them up to the listening 1692 * socket, using rip6_input. 1693 * The only message processed is the REGISTER pim message; the pim header 1694 * is stripped off, and the inner packet is passed to register_mforward. 1695 */ 1696 int 1697 pim6_input(struct mbuf **mp, int *offp, int proto) 1698 { 1699 struct pim *pim; /* pointer to a pim struct */ 1700 struct ip6_hdr *ip6; 1701 int pimlen; 1702 struct mbuf *m = *mp; 1703 int minlen; 1704 int off = *offp; 1705 1706 PIM6STAT_INC(pim6s_rcv_total); 1707 1708 ip6 = mtod(m, struct ip6_hdr *); 1709 pimlen = m->m_pkthdr.len - *offp; 1710 1711 /* 1712 * Validate lengths 1713 */ 1714 if (pimlen < PIM_MINLEN) { 1715 PIM6STAT_INC(pim6s_rcv_tooshort); 1716 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1717 m_freem(m); 1718 return (IPPROTO_DONE); 1719 } 1720 1721 /* 1722 * if the packet is at least as big as a REGISTER, go ahead 1723 * and grab the PIM REGISTER header size, to avoid another 1724 * possible m_pullup() later. 1725 * 1726 * PIM_MINLEN == pimhdr + u_int32 == 8 1727 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1728 */ 1729 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1730 1731 /* 1732 * Make sure that the IP6 and PIM headers in contiguous memory, and 1733 * possibly the PIM REGISTER header 1734 */ 1735 #ifndef PULLDOWN_TEST 1736 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1737 /* adjust pointer */ 1738 ip6 = mtod(m, struct ip6_hdr *); 1739 1740 /* adjust mbuf to point to the PIM header */ 1741 pim = (struct pim *)((caddr_t)ip6 + off); 1742 #else 1743 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1744 if (pim == NULL) { 1745 PIM6STAT_INC(pim6s_rcv_tooshort); 1746 return (IPPROTO_DONE); 1747 } 1748 #endif 1749 1750 #define PIM6_CHECKSUM 1751 #ifdef PIM6_CHECKSUM 1752 { 1753 int cksumlen; 1754 1755 /* 1756 * Validate checksum. 1757 * If PIM REGISTER, exclude the data packet 1758 */ 1759 if (pim->pim_type == PIM_REGISTER) 1760 cksumlen = PIM_MINLEN; 1761 else 1762 cksumlen = pimlen; 1763 1764 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1765 PIM6STAT_INC(pim6s_rcv_badsum); 1766 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1767 m_freem(m); 1768 return (IPPROTO_DONE); 1769 } 1770 } 1771 #endif /* PIM_CHECKSUM */ 1772 1773 /* PIM version check */ 1774 if (pim->pim_ver != PIM_VERSION) { 1775 PIM6STAT_INC(pim6s_rcv_badversion); 1776 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1777 "incorrect version %d, expecting %d", 1778 pim->pim_ver, PIM_VERSION); 1779 m_freem(m); 1780 return (IPPROTO_DONE); 1781 } 1782 1783 if (pim->pim_type == PIM_REGISTER) { 1784 /* 1785 * since this is a REGISTER, we'll make a copy of the register 1786 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1787 * routing daemon. 1788 */ 1789 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1790 1791 struct mbuf *mcp; 1792 struct ip6_hdr *eip6; 1793 u_int32_t *reghdr; 1794 int rc; 1795 #ifdef MRT6DEBUG 1796 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1797 #endif 1798 1799 PIM6STAT_INC(pim6s_rcv_registers); 1800 1801 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1802 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1803 reg_mif_num); 1804 m_freem(m); 1805 return (IPPROTO_DONE); 1806 } 1807 1808 reghdr = (u_int32_t *)(pim + 1); 1809 1810 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1811 goto pim6_input_to_daemon; 1812 1813 /* 1814 * Validate length 1815 */ 1816 if (pimlen < PIM6_REG_MINLEN) { 1817 PIM6STAT_INC(pim6s_rcv_tooshort); 1818 PIM6STAT_INC(pim6s_rcv_badregisters); 1819 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1820 "size too small %d from %s", 1821 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1822 m_freem(m); 1823 return (IPPROTO_DONE); 1824 } 1825 1826 eip6 = (struct ip6_hdr *) (reghdr + 1); 1827 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1828 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1829 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1830 ntohs(eip6->ip6_plen)); 1831 1832 /* verify the version number of the inner packet */ 1833 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1834 PIM6STAT_INC(pim6s_rcv_badregisters); 1835 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1836 "of the inner packet", 1837 (eip6->ip6_vfc & IPV6_VERSION)); 1838 m_freem(m); 1839 return (IPPROTO_NONE); 1840 } 1841 1842 /* verify the inner packet is destined to a mcast group */ 1843 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1844 PIM6STAT_INC(pim6s_rcv_badregisters); 1845 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1846 "is not multicast %s", 1847 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1848 m_freem(m); 1849 return (IPPROTO_DONE); 1850 } 1851 1852 /* 1853 * make a copy of the whole header to pass to the daemon later. 1854 */ 1855 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1856 if (mcp == NULL) { 1857 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1858 "could not copy register head"); 1859 m_freem(m); 1860 return (IPPROTO_DONE); 1861 } 1862 1863 /* 1864 * forward the inner ip6 packet; point m_data at the inner ip6. 1865 */ 1866 m_adj(m, off + PIM_MINLEN); 1867 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1868 "src %s, dst %s, mif %d", 1869 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1870 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1871 1872 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1873 dst.sin6_family, 0); 1874 1875 /* prepare the register head to send to the mrouting daemon */ 1876 m = mcp; 1877 } 1878 1879 /* 1880 * Pass the PIM message up to the daemon; if it is a register message 1881 * pass the 'head' only up to the daemon. This includes the 1882 * encapsulator ip6 header, pim header, register header and the 1883 * encapsulated ip6 header. 1884 */ 1885 pim6_input_to_daemon: 1886 rip6_input(&m, offp, proto); 1887 return (IPPROTO_DONE); 1888 } 1889 1890 static int 1891 ip6_mroute_modevent(module_t mod, int type, void *unused) 1892 { 1893 1894 switch (type) { 1895 case MOD_LOAD: 1896 MROUTER6_LOCK_INIT(); 1897 MFC6_LOCK_INIT(); 1898 MIF6_LOCK_INIT(); 1899 1900 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 1901 pim6_encapcheck, 1902 (const struct protosw *)&in6_pim_protosw, NULL); 1903 if (pim6_encap_cookie == NULL) { 1904 printf("ip6_mroute: unable to attach pim6 encap\n"); 1905 MIF6_LOCK_DESTROY(); 1906 MFC6_LOCK_DESTROY(); 1907 MROUTER6_LOCK_DESTROY(); 1908 return (EINVAL); 1909 } 1910 1911 ip6_mforward = X_ip6_mforward; 1912 ip6_mrouter_done = X_ip6_mrouter_done; 1913 ip6_mrouter_get = X_ip6_mrouter_get; 1914 ip6_mrouter_set = X_ip6_mrouter_set; 1915 mrt6_ioctl = X_mrt6_ioctl; 1916 break; 1917 1918 case MOD_UNLOAD: 1919 if (V_ip6_mrouter != NULL) 1920 return EINVAL; 1921 1922 if (pim6_encap_cookie) { 1923 encap_detach(pim6_encap_cookie); 1924 pim6_encap_cookie = NULL; 1925 } 1926 X_ip6_mrouter_done(); 1927 ip6_mforward = NULL; 1928 ip6_mrouter_done = NULL; 1929 ip6_mrouter_get = NULL; 1930 ip6_mrouter_set = NULL; 1931 mrt6_ioctl = NULL; 1932 1933 MIF6_LOCK_DESTROY(); 1934 MFC6_LOCK_DESTROY(); 1935 MROUTER6_LOCK_DESTROY(); 1936 break; 1937 1938 default: 1939 return (EOPNOTSUPP); 1940 } 1941 1942 return (0); 1943 } 1944 1945 static moduledata_t ip6_mroutemod = { 1946 "ip6_mroute", 1947 ip6_mroute_modevent, 1948 0 1949 }; 1950 1951 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1952