Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/ip6_mroute.c
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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 #include "opt_kdtrace.h" 86 87 #include <sys/param.h> 88 #include <sys/callout.h> 89 #include <sys/errno.h> 90 #include <sys/kernel.h> 91 #include <sys/lock.h> 92 #include <sys/malloc.h> 93 #include <sys/mbuf.h> 94 #include <sys/module.h> 95 #include <sys/domain.h> 96 #include <sys/protosw.h> 97 #include <sys/sdt.h> 98 #include <sys/signalvar.h> 99 #include <sys/socket.h> 100 #include <sys/socketvar.h> 101 #include <sys/sockio.h> 102 #include <sys/sx.h> 103 #include <sys/sysctl.h> 104 #include <sys/syslog.h> 105 #include <sys/systm.h> 106 #include <sys/time.h> 107 108 #include <net/if.h> 109 #include <net/if_types.h> 110 #include <net/raw_cb.h> 111 #include <net/vnet.h> 112 113 #include <netinet/in.h> 114 #include <netinet/in_var.h> 115 #include <netinet/icmp6.h> 116 #include <netinet/ip_encap.h> 117 118 #include <netinet/ip6.h> 119 #include <netinet/in_kdtrace.h> 120 #include <netinet6/ip6_var.h> 121 #include <netinet6/scope6_var.h> 122 #include <netinet6/nd6.h> 123 #include <netinet6/ip6_mroute.h> 124 #include <netinet6/ip6protosw.h> 125 #include <netinet6/pim6.h> 126 #include <netinet6/pim6_var.h> 127 128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 129 130 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 131 #define M_HASCL(m) ((m)->m_flags & M_EXT) 132 133 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 134 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 135 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 136 static int set_pim6(int *); 137 static int socket_send(struct socket *, struct mbuf *, 138 struct sockaddr_in6 *); 139 140 extern int in6_mcast_loop; 141 extern struct domain inet6domain; 142 143 static const struct encaptab *pim6_encap_cookie; 144 static const struct ip6protosw in6_pim_protosw = { 145 .pr_type = SOCK_RAW, 146 .pr_domain = &inet6domain, 147 .pr_protocol = IPPROTO_PIM, 148 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 149 .pr_input = pim6_input, 150 .pr_output = rip6_output, 151 .pr_ctloutput = rip6_ctloutput, 152 .pr_usrreqs = &rip6_usrreqs 153 }; 154 static int pim6_encapcheck(const struct mbuf *, int, int, void *); 155 156 static VNET_DEFINE(int, ip6_mrouter_ver) = 0; 157 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 158 159 SYSCTL_DECL(_net_inet6); 160 SYSCTL_DECL(_net_inet6_ip6); 161 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 162 163 static struct mrt6stat mrt6stat; 164 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 165 &mrt6stat, mrt6stat, 166 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 167 168 #define MRT6STAT_INC(name) mrt6stat.name += 1 169 #define NO_RTE_FOUND 0x1 170 #define RTE_FOUND 0x2 171 172 static 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) 182 183 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 184 SYSCTL_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)"); 188 189 static 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) 199 200 static u_char n6expire[MF6CTBLSIZ]; 201 202 static struct mif6 mif6table[MAXMIFS]; 203 SYSCTL_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)"); 206 207 static 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 216 static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */ 217 #define V_mrt6debug VNET(mrt6debug) 218 #define DEBUG_MFC 0x02 219 #define DEBUG_FORWARD 0x04 220 #define DEBUG_EXPIRE 0x08 221 #define DEBUG_XMIT 0x10 222 #define DEBUG_REG 0x20 223 #define DEBUG_PIM 0x40 224 #define DEBUG_ERR 0x80 225 #define DEBUG_ANY 0x7f 226 #define MRT6_DLOG(m, fmt, ...) \ 227 if (V_mrt6debug & (m)) \ 228 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 229 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 230 #else 231 #define MRT6_DLOG(m, fmt, ...) 232 #endif 233 234 static void expire_upcalls(void *); 235 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 236 #define UPCALL_EXPIRE 6 /* number of timeouts */ 237 238 /* 239 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 240 */ 241 242 /* 243 * 'Interfaces' associated with decapsulator (so we can tell 244 * packets that went through it from ones that get reflected 245 * by a broken gateway). Different from IPv4 register_if, 246 * these interfaces are linked into the system ifnet list, 247 * because per-interface IPv6 statistics are maintained in 248 * ifp->if_afdata. But it does not have any routes point 249 * to them. I.e., packets can't be sent this way. They 250 * only exist as a placeholder for multicast source 251 * verification. 252 */ 253 static struct ifnet *multicast_register_if6; 254 255 #define ENCAP_HOPS 64 256 257 /* 258 * Private variables. 259 */ 260 static mifi_t nummifs = 0; 261 static mifi_t reg_mif_num = (mifi_t)-1; 262 263 static struct pim6stat pim6stat; 264 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 265 &pim6stat, pim6stat, 266 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 267 268 #define PIM6STAT_INC(name) pim6stat.name += 1 269 static VNET_DEFINE(int, pim6); 270 #define V_pim6 VNET(pim6) 271 272 /* 273 * Hash function for a source, group entry 274 */ 275 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 276 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 277 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 278 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 279 280 /* 281 * Find a route for a given origin IPv6 address and Multicast group address. 282 */ 283 #define MF6CFIND(o, g, rt) do { \ 284 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 285 rt = NULL; \ 286 while (_rt) { \ 287 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 288 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 289 (_rt->mf6c_stall == NULL)) { \ 290 rt = _rt; \ 291 break; \ 292 } \ 293 _rt = _rt->mf6c_next; \ 294 } \ 295 if (rt == NULL) { \ 296 MRT6STAT_INC(mrt6s_mfc_misses); \ 297 } \ 298 } while (/*CONSTCOND*/ 0) 299 300 /* 301 * Macros to compute elapsed time efficiently 302 * Borrowed from Van Jacobson's scheduling code 303 * XXX: replace with timersub() ? 304 */ 305 #define TV_DELTA(a, b, delta) do { \ 306 int xxs; \ 307 \ 308 delta = (a).tv_usec - (b).tv_usec; \ 309 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 310 switch (xxs) { \ 311 case 2: \ 312 delta += 1000000; \ 313 /* FALLTHROUGH */ \ 314 case 1: \ 315 delta += 1000000; \ 316 break; \ 317 default: \ 318 delta += (1000000 * xxs); \ 319 } \ 320 } \ 321 } while (/*CONSTCOND*/ 0) 322 323 /* XXX: replace with timercmp(a, b, <) ? */ 324 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 325 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 326 327 #ifdef UPCALL_TIMING 328 #define UPCALL_MAX 50 329 static u_long upcall_data[UPCALL_MAX + 1]; 330 static void collate(); 331 #endif /* UPCALL_TIMING */ 332 333 static int ip6_mrouter_init(struct socket *, int, int); 334 static int add_m6fc(struct mf6cctl *); 335 static int add_m6if(struct mif6ctl *); 336 static int del_m6fc(struct mf6cctl *); 337 static int del_m6if(mifi_t *); 338 static int del_m6if_locked(mifi_t *); 339 static int get_mif6_cnt(struct sioc_mif_req6 *); 340 static int get_sg_cnt(struct sioc_sg_req6 *); 341 342 static struct callout expire_upcalls_ch; 343 344 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 345 int X_ip6_mrouter_done(void); 346 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 347 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 348 int X_mrt6_ioctl(u_long, caddr_t); 349 350 /* 351 * Handle MRT setsockopt commands to modify the multicast routing tables. 352 */ 353 int 354 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 355 { 356 int error = 0; 357 int optval; 358 struct mif6ctl mifc; 359 struct mf6cctl mfcc; 360 mifi_t mifi; 361 362 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 363 return (EACCES); 364 365 switch (sopt->sopt_name) { 366 case MRT6_INIT: 367 #ifdef MRT6_OINIT 368 case MRT6_OINIT: 369 #endif 370 error = sooptcopyin(sopt, &optval, sizeof(optval), 371 sizeof(optval)); 372 if (error) 373 break; 374 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 375 break; 376 case MRT6_DONE: 377 error = X_ip6_mrouter_done(); 378 break; 379 case MRT6_ADD_MIF: 380 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 381 if (error) 382 break; 383 error = add_m6if(&mifc); 384 break; 385 case MRT6_ADD_MFC: 386 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 387 if (error) 388 break; 389 error = add_m6fc(&mfcc); 390 break; 391 case MRT6_DEL_MFC: 392 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 393 if (error) 394 break; 395 error = del_m6fc(&mfcc); 396 break; 397 case MRT6_DEL_MIF: 398 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 399 if (error) 400 break; 401 error = del_m6if(&mifi); 402 break; 403 case MRT6_PIM: 404 error = sooptcopyin(sopt, &optval, sizeof(optval), 405 sizeof(optval)); 406 if (error) 407 break; 408 error = set_pim6(&optval); 409 break; 410 default: 411 error = EOPNOTSUPP; 412 break; 413 } 414 415 return (error); 416 } 417 418 /* 419 * Handle MRT getsockopt commands 420 */ 421 int 422 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 423 { 424 int error = 0; 425 426 if (so != V_ip6_mrouter) 427 return (EACCES); 428 429 switch (sopt->sopt_name) { 430 case MRT6_PIM: 431 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 432 break; 433 } 434 return (error); 435 } 436 437 /* 438 * Handle ioctl commands to obtain information from the cache 439 */ 440 int 441 X_mrt6_ioctl(u_long cmd, caddr_t data) 442 { 443 int ret; 444 445 ret = EINVAL; 446 447 switch (cmd) { 448 case SIOCGETSGCNT_IN6: 449 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 450 break; 451 452 case SIOCGETMIFCNT_IN6: 453 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 454 break; 455 456 default: 457 break; 458 } 459 460 return (ret); 461 } 462 463 /* 464 * returns the packet, byte, rpf-failure count for the source group provided 465 */ 466 static int 467 get_sg_cnt(struct sioc_sg_req6 *req) 468 { 469 struct mf6c *rt; 470 int ret; 471 472 ret = 0; 473 474 MFC6_LOCK(); 475 476 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 477 if (rt == NULL) { 478 ret = ESRCH; 479 } else { 480 req->pktcnt = rt->mf6c_pkt_cnt; 481 req->bytecnt = rt->mf6c_byte_cnt; 482 req->wrong_if = rt->mf6c_wrong_if; 483 } 484 485 MFC6_UNLOCK(); 486 487 return (ret); 488 } 489 490 /* 491 * returns the input and output packet and byte counts on the mif provided 492 */ 493 static int 494 get_mif6_cnt(struct sioc_mif_req6 *req) 495 { 496 mifi_t mifi; 497 int ret; 498 499 ret = 0; 500 mifi = req->mifi; 501 502 MIF6_LOCK(); 503 504 if (mifi >= nummifs) { 505 ret = EINVAL; 506 } else { 507 req->icount = mif6table[mifi].m6_pkt_in; 508 req->ocount = mif6table[mifi].m6_pkt_out; 509 req->ibytes = mif6table[mifi].m6_bytes_in; 510 req->obytes = mif6table[mifi].m6_bytes_out; 511 } 512 513 MIF6_UNLOCK(); 514 515 return (ret); 516 } 517 518 static int 519 set_pim6(int *i) 520 { 521 if ((*i != 1) && (*i != 0)) 522 return (EINVAL); 523 524 V_pim6 = *i; 525 526 return (0); 527 } 528 529 /* 530 * Enable multicast routing 531 */ 532 static int 533 ip6_mrouter_init(struct socket *so, int v, int cmd) 534 { 535 536 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 537 so->so_type, so->so_proto->pr_protocol); 538 539 if (so->so_type != SOCK_RAW || 540 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 541 return (EOPNOTSUPP); 542 543 if (v != 1) 544 return (ENOPROTOOPT); 545 546 MROUTER6_LOCK(); 547 548 if (V_ip6_mrouter != NULL) { 549 MROUTER6_UNLOCK(); 550 return (EADDRINUSE); 551 } 552 553 V_ip6_mrouter = so; 554 V_ip6_mrouter_ver = cmd; 555 556 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 557 bzero((caddr_t)n6expire, sizeof(n6expire)); 558 559 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 560 561 callout_init(&expire_upcalls_ch, 0); 562 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 563 expire_upcalls, NULL); 564 565 MROUTER6_UNLOCK(); 566 MRT6_DLOG(DEBUG_ANY, "finished"); 567 568 return (0); 569 } 570 571 /* 572 * Disable IPv6 multicast forwarding. 573 */ 574 int 575 X_ip6_mrouter_done(void) 576 { 577 mifi_t mifi; 578 u_long i; 579 struct mf6c *rt; 580 struct rtdetq *rte; 581 582 MROUTER6_LOCK(); 583 584 if (V_ip6_mrouter == NULL) { 585 MROUTER6_UNLOCK(); 586 return (EINVAL); 587 } 588 589 /* 590 * For each phyint in use, disable promiscuous reception of all IPv6 591 * multicasts. 592 */ 593 for (mifi = 0; mifi < nummifs; mifi++) { 594 if (mif6table[mifi].m6_ifp && 595 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 596 if_allmulti(mif6table[mifi].m6_ifp, 0); 597 } 598 } 599 bzero((caddr_t)mif6table, sizeof(mif6table)); 600 nummifs = 0; 601 602 V_pim6 = 0; /* used to stub out/in pim specific code */ 603 604 callout_stop(&expire_upcalls_ch); 605 606 /* 607 * Free all multicast forwarding cache entries. 608 */ 609 MFC6_LOCK(); 610 for (i = 0; i < MF6CTBLSIZ; i++) { 611 rt = mf6ctable[i]; 612 while (rt) { 613 struct mf6c *frt; 614 615 for (rte = rt->mf6c_stall; rte != NULL; ) { 616 struct rtdetq *n = rte->next; 617 618 m_freem(rte->m); 619 free(rte, M_MRTABLE6); 620 rte = n; 621 } 622 frt = rt; 623 rt = rt->mf6c_next; 624 free(frt, M_MRTABLE6); 625 } 626 } 627 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 628 MFC6_UNLOCK(); 629 630 /* 631 * Reset register interface 632 */ 633 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 634 if_detach(multicast_register_if6); 635 if_free(multicast_register_if6); 636 reg_mif_num = (mifi_t)-1; 637 multicast_register_if6 = NULL; 638 } 639 640 V_ip6_mrouter = NULL; 641 V_ip6_mrouter_ver = 0; 642 643 MROUTER6_UNLOCK(); 644 MRT6_DLOG(DEBUG_ANY, "finished"); 645 646 return (0); 647 } 648 649 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 650 651 /* 652 * Add a mif to the mif table 653 */ 654 static int 655 add_m6if(struct mif6ctl *mifcp) 656 { 657 struct mif6 *mifp; 658 struct ifnet *ifp; 659 int error; 660 661 MIF6_LOCK(); 662 663 if (mifcp->mif6c_mifi >= MAXMIFS) { 664 MIF6_UNLOCK(); 665 return (EINVAL); 666 } 667 mifp = mif6table + mifcp->mif6c_mifi; 668 if (mifp->m6_ifp != NULL) { 669 MIF6_UNLOCK(); 670 return (EADDRINUSE); /* XXX: is it appropriate? */ 671 } 672 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 673 MIF6_UNLOCK(); 674 return (ENXIO); 675 } 676 677 ifp = ifnet_byindex(mifcp->mif6c_pifi); 678 679 if (mifcp->mif6c_flags & MIFF_REGISTER) { 680 if (reg_mif_num == (mifi_t)-1) { 681 ifp = if_alloc(IFT_OTHER); 682 683 if_initname(ifp, "register_mif", 0); 684 ifp->if_flags |= IFF_LOOPBACK; 685 if_attach(ifp); 686 multicast_register_if6 = ifp; 687 reg_mif_num = mifcp->mif6c_mifi; 688 /* 689 * it is impossible to guess the ifindex of the 690 * register interface. So mif6c_pifi is automatically 691 * calculated. 692 */ 693 mifcp->mif6c_pifi = ifp->if_index; 694 } else { 695 ifp = multicast_register_if6; 696 } 697 } else { 698 /* Make sure the interface supports multicast */ 699 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 700 MIF6_UNLOCK(); 701 return (EOPNOTSUPP); 702 } 703 704 error = if_allmulti(ifp, 1); 705 if (error) { 706 MIF6_UNLOCK(); 707 return (error); 708 } 709 } 710 711 mifp->m6_flags = mifcp->mif6c_flags; 712 mifp->m6_ifp = ifp; 713 714 /* initialize per mif pkt counters */ 715 mifp->m6_pkt_in = 0; 716 mifp->m6_pkt_out = 0; 717 mifp->m6_bytes_in = 0; 718 mifp->m6_bytes_out = 0; 719 720 /* Adjust nummifs up if the mifi is higher than nummifs */ 721 if (nummifs <= mifcp->mif6c_mifi) 722 nummifs = mifcp->mif6c_mifi + 1; 723 724 MIF6_UNLOCK(); 725 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 726 if_name(ifp)); 727 728 return (0); 729 } 730 731 /* 732 * Delete a mif from the mif table 733 */ 734 static int 735 del_m6if_locked(mifi_t *mifip) 736 { 737 struct mif6 *mifp = mif6table + *mifip; 738 mifi_t mifi; 739 struct ifnet *ifp; 740 741 MIF6_LOCK_ASSERT(); 742 743 if (*mifip >= nummifs) 744 return (EINVAL); 745 if (mifp->m6_ifp == NULL) 746 return (EINVAL); 747 748 if (!(mifp->m6_flags & MIFF_REGISTER)) { 749 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 750 ifp = mifp->m6_ifp; 751 if_allmulti(ifp, 0); 752 } else { 753 if (reg_mif_num != (mifi_t)-1 && 754 multicast_register_if6 != NULL) { 755 if_detach(multicast_register_if6); 756 if_free(multicast_register_if6); 757 reg_mif_num = (mifi_t)-1; 758 multicast_register_if6 = NULL; 759 } 760 } 761 762 bzero((caddr_t)mifp, sizeof(*mifp)); 763 764 /* Adjust nummifs down */ 765 for (mifi = nummifs; mifi > 0; mifi--) 766 if (mif6table[mifi - 1].m6_ifp) 767 break; 768 nummifs = mifi; 769 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 770 771 return (0); 772 } 773 774 static int 775 del_m6if(mifi_t *mifip) 776 { 777 int cc; 778 779 MIF6_LOCK(); 780 cc = del_m6if_locked(mifip); 781 MIF6_UNLOCK(); 782 783 return (cc); 784 } 785 786 /* 787 * Add an mfc entry 788 */ 789 static int 790 add_m6fc(struct mf6cctl *mfccp) 791 { 792 struct mf6c *rt; 793 u_long hash; 794 struct rtdetq *rte; 795 u_short nstl; 796 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 797 798 MFC6_LOCK(); 799 800 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 801 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 802 803 /* If an entry already exists, just update the fields */ 804 if (rt) { 805 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 806 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 807 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 808 mfccp->mf6cc_parent); 809 810 rt->mf6c_parent = mfccp->mf6cc_parent; 811 rt->mf6c_ifset = mfccp->mf6cc_ifset; 812 813 MFC6_UNLOCK(); 814 return (0); 815 } 816 817 /* 818 * Find the entry for which the upcall was made and update 819 */ 820 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 821 mfccp->mf6cc_mcastgrp.sin6_addr); 822 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 823 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 824 &mfccp->mf6cc_origin.sin6_addr) && 825 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 826 &mfccp->mf6cc_mcastgrp.sin6_addr) && 827 (rt->mf6c_stall != NULL)) { 828 829 if (nstl++) 830 log(LOG_ERR, 831 "add_m6fc: %s o %s g %s p %x dbx %p\n", 832 "multiple kernel entries", 833 ip6_sprintf(ip6bufo, 834 &mfccp->mf6cc_origin.sin6_addr), 835 ip6_sprintf(ip6bufg, 836 &mfccp->mf6cc_mcastgrp.sin6_addr), 837 mfccp->mf6cc_parent, rt->mf6c_stall); 838 839 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 840 ip6_sprintf(ip6bufo, 841 &mfccp->mf6cc_origin.sin6_addr), 842 ip6_sprintf(ip6bufg, 843 &mfccp->mf6cc_mcastgrp.sin6_addr), 844 mfccp->mf6cc_parent, rt->mf6c_stall); 845 846 rt->mf6c_origin = mfccp->mf6cc_origin; 847 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 848 rt->mf6c_parent = mfccp->mf6cc_parent; 849 rt->mf6c_ifset = mfccp->mf6cc_ifset; 850 /* initialize pkt counters per src-grp */ 851 rt->mf6c_pkt_cnt = 0; 852 rt->mf6c_byte_cnt = 0; 853 rt->mf6c_wrong_if = 0; 854 855 rt->mf6c_expire = 0; /* Don't clean this guy up */ 856 n6expire[hash]--; 857 858 /* free packets Qed at the end of this entry */ 859 for (rte = rt->mf6c_stall; rte != NULL; ) { 860 struct rtdetq *n = rte->next; 861 ip6_mdq(rte->m, rte->ifp, rt); 862 m_freem(rte->m); 863 #ifdef UPCALL_TIMING 864 collate(&(rte->t)); 865 #endif /* UPCALL_TIMING */ 866 free(rte, M_MRTABLE6); 867 rte = n; 868 } 869 rt->mf6c_stall = NULL; 870 } 871 } 872 873 /* 874 * It is possible that an entry is being inserted without an upcall 875 */ 876 if (nstl == 0) { 877 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 878 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 879 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 880 mfccp->mf6cc_parent); 881 882 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 883 884 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 885 &mfccp->mf6cc_origin.sin6_addr)&& 886 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 887 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 888 889 rt->mf6c_origin = mfccp->mf6cc_origin; 890 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 891 rt->mf6c_parent = mfccp->mf6cc_parent; 892 rt->mf6c_ifset = mfccp->mf6cc_ifset; 893 /* initialize pkt counters per src-grp */ 894 rt->mf6c_pkt_cnt = 0; 895 rt->mf6c_byte_cnt = 0; 896 rt->mf6c_wrong_if = 0; 897 898 if (rt->mf6c_expire) 899 n6expire[hash]--; 900 rt->mf6c_expire = 0; 901 } 902 } 903 if (rt == NULL) { 904 /* no upcall, so make a new entry */ 905 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 906 M_NOWAIT); 907 if (rt == NULL) { 908 MFC6_UNLOCK(); 909 return (ENOBUFS); 910 } 911 912 /* insert new entry at head of hash chain */ 913 rt->mf6c_origin = mfccp->mf6cc_origin; 914 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 915 rt->mf6c_parent = mfccp->mf6cc_parent; 916 rt->mf6c_ifset = mfccp->mf6cc_ifset; 917 /* initialize pkt counters per src-grp */ 918 rt->mf6c_pkt_cnt = 0; 919 rt->mf6c_byte_cnt = 0; 920 rt->mf6c_wrong_if = 0; 921 rt->mf6c_expire = 0; 922 rt->mf6c_stall = NULL; 923 924 /* link into table */ 925 rt->mf6c_next = mf6ctable[hash]; 926 mf6ctable[hash] = rt; 927 } 928 } 929 930 MFC6_UNLOCK(); 931 return (0); 932 } 933 934 #ifdef UPCALL_TIMING 935 /* 936 * collect delay statistics on the upcalls 937 */ 938 static void 939 collate(struct timeval *t) 940 { 941 u_long d; 942 struct timeval tp; 943 u_long delta; 944 945 GET_TIME(tp); 946 947 if (TV_LT(*t, tp)) 948 { 949 TV_DELTA(tp, *t, delta); 950 951 d = delta >> 10; 952 if (d > UPCALL_MAX) 953 d = UPCALL_MAX; 954 955 ++upcall_data[d]; 956 } 957 } 958 #endif /* UPCALL_TIMING */ 959 960 /* 961 * Delete an mfc entry 962 */ 963 static int 964 del_m6fc(struct mf6cctl *mfccp) 965 { 966 #ifdef MRT6DEBUG 967 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 968 #endif 969 struct sockaddr_in6 origin; 970 struct sockaddr_in6 mcastgrp; 971 struct mf6c *rt; 972 struct mf6c **nptr; 973 u_long hash; 974 975 origin = mfccp->mf6cc_origin; 976 mcastgrp = mfccp->mf6cc_mcastgrp; 977 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 978 979 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 980 ip6_sprintf(ip6bufo, &origin.sin6_addr), 981 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 982 983 MFC6_LOCK(); 984 985 nptr = &mf6ctable[hash]; 986 while ((rt = *nptr) != NULL) { 987 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 988 &rt->mf6c_origin.sin6_addr) && 989 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 990 &rt->mf6c_mcastgrp.sin6_addr) && 991 rt->mf6c_stall == NULL) 992 break; 993 994 nptr = &rt->mf6c_next; 995 } 996 if (rt == NULL) { 997 MFC6_UNLOCK(); 998 return (EADDRNOTAVAIL); 999 } 1000 1001 *nptr = rt->mf6c_next; 1002 free(rt, M_MRTABLE6); 1003 1004 MFC6_UNLOCK(); 1005 1006 return (0); 1007 } 1008 1009 static int 1010 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1011 { 1012 1013 if (s) { 1014 if (sbappendaddr(&s->so_rcv, 1015 (struct sockaddr *)src, 1016 mm, (struct mbuf *)0) != 0) { 1017 sorwakeup(s); 1018 return (0); 1019 } 1020 } 1021 m_freem(mm); 1022 return (-1); 1023 } 1024 1025 /* 1026 * IPv6 multicast forwarding function. This function assumes that the packet 1027 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1028 * pointed to by "ifp", and the packet is to be relayed to other networks 1029 * that have members of the packet's destination IPv6 multicast group. 1030 * 1031 * The packet is returned unscathed to the caller, unless it is 1032 * erroneous, in which case a non-zero return value tells the caller to 1033 * discard it. 1034 * 1035 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1036 * this function is called in the originating context (i.e., not when 1037 * forwarding a packet from other node). ip6_output(), which is currently the 1038 * only function that calls this function is called in the originating context, 1039 * explicitly ensures this condition. It is caller's responsibility to ensure 1040 * that if this function is called from somewhere else in the originating 1041 * context in the future. 1042 */ 1043 int 1044 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1045 { 1046 struct rtdetq *rte; 1047 struct mbuf *mb0; 1048 struct mf6c *rt; 1049 struct mif6 *mifp; 1050 struct mbuf *mm; 1051 u_long hash; 1052 mifi_t mifi; 1053 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1054 #ifdef UPCALL_TIMING 1055 struct timeval tp; 1056 1057 GET_TIME(tp); 1058 #endif /* UPCALL_TIMING */ 1059 1060 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1061 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1062 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1063 1064 /* 1065 * Don't forward a packet with Hop limit of zero or one, 1066 * or a packet destined to a local-only group. 1067 */ 1068 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1069 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1070 return (0); 1071 ip6->ip6_hlim--; 1072 1073 /* 1074 * Source address check: do not forward packets with unspecified 1075 * source. It was discussed in July 2000, on ipngwg mailing list. 1076 * This is rather more serious than unicast cases, because some 1077 * MLD packets can be sent with the unspecified source address 1078 * (although such packets must normally set 1 to the hop limit field). 1079 */ 1080 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1081 IP6STAT_INC(ip6s_cantforward); 1082 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1083 V_ip6_log_time = time_uptime; 1084 log(LOG_DEBUG, 1085 "cannot forward " 1086 "from %s to %s nxt %d received on %s\n", 1087 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1088 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1089 ip6->ip6_nxt, 1090 if_name(m->m_pkthdr.rcvif)); 1091 } 1092 return (0); 1093 } 1094 1095 MFC6_LOCK(); 1096 1097 /* 1098 * Determine forwarding mifs from the forwarding cache table 1099 */ 1100 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1101 MRT6STAT_INC(mrt6s_mfc_lookups); 1102 1103 /* Entry exists, so forward if necessary */ 1104 if (rt) { 1105 MFC6_UNLOCK(); 1106 return (ip6_mdq(m, ifp, rt)); 1107 } 1108 1109 /* 1110 * If we don't have a route for packet's origin, 1111 * Make a copy of the packet & send message to routing daemon. 1112 */ 1113 MRT6STAT_INC(mrt6s_no_route); 1114 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1115 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1116 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1117 1118 /* 1119 * Allocate mbufs early so that we don't do extra work if we 1120 * are just going to fail anyway. 1121 */ 1122 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1123 if (rte == NULL) { 1124 MFC6_UNLOCK(); 1125 return (ENOBUFS); 1126 } 1127 mb0 = m_copy(m, 0, M_COPYALL); 1128 /* 1129 * Pullup packet header if needed before storing it, 1130 * as other references may modify it in the meantime. 1131 */ 1132 if (mb0 && (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1133 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1134 if (mb0 == NULL) { 1135 free(rte, M_MRTABLE6); 1136 MFC6_UNLOCK(); 1137 return (ENOBUFS); 1138 } 1139 1140 /* is there an upcall waiting for this packet? */ 1141 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1142 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1143 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1144 &rt->mf6c_origin.sin6_addr) && 1145 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1146 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1147 break; 1148 } 1149 1150 if (rt == NULL) { 1151 struct mrt6msg *im; 1152 #ifdef MRT6_OINIT 1153 struct omrt6msg *oim; 1154 #endif 1155 /* no upcall, so make a new entry */ 1156 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1157 if (rt == NULL) { 1158 free(rte, M_MRTABLE6); 1159 m_freem(mb0); 1160 MFC6_UNLOCK(); 1161 return (ENOBUFS); 1162 } 1163 /* 1164 * Make a copy of the header to send to the user 1165 * level process 1166 */ 1167 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1168 if (mm == NULL) { 1169 free(rte, M_MRTABLE6); 1170 m_freem(mb0); 1171 free(rt, M_MRTABLE6); 1172 MFC6_UNLOCK(); 1173 return (ENOBUFS); 1174 } 1175 1176 /* 1177 * Send message to routing daemon 1178 */ 1179 sin6.sin6_addr = ip6->ip6_src; 1180 im = NULL; 1181 #ifdef MRT6_OINIT 1182 oim = NULL; 1183 #endif 1184 switch (V_ip6_mrouter_ver) { 1185 #ifdef MRT6_OINIT 1186 case MRT6_OINIT: 1187 oim = mtod(mm, struct omrt6msg *); 1188 oim->im6_msgtype = MRT6MSG_NOCACHE; 1189 oim->im6_mbz = 0; 1190 break; 1191 #endif 1192 case MRT6_INIT: 1193 im = mtod(mm, struct mrt6msg *); 1194 im->im6_msgtype = MRT6MSG_NOCACHE; 1195 im->im6_mbz = 0; 1196 break; 1197 default: 1198 free(rte, M_MRTABLE6); 1199 m_freem(mb0); 1200 free(rt, M_MRTABLE6); 1201 MFC6_UNLOCK(); 1202 return (EINVAL); 1203 } 1204 1205 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1206 for (mifp = mif6table, mifi = 0; 1207 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1208 ; 1209 1210 switch (V_ip6_mrouter_ver) { 1211 #ifdef MRT6_OINIT 1212 case MRT6_OINIT: 1213 oim->im6_mif = mifi; 1214 break; 1215 #endif 1216 case MRT6_INIT: 1217 im->im6_mif = mifi; 1218 break; 1219 } 1220 1221 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1222 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1223 "socket queue full\n"); 1224 MRT6STAT_INC(mrt6s_upq_sockfull); 1225 free(rte, M_MRTABLE6); 1226 m_freem(mb0); 1227 free(rt, M_MRTABLE6); 1228 MFC6_UNLOCK(); 1229 return (ENOBUFS); 1230 } 1231 1232 MRT6STAT_INC(mrt6s_upcalls); 1233 1234 /* insert new entry at head of hash chain */ 1235 bzero(rt, sizeof(*rt)); 1236 rt->mf6c_origin.sin6_family = AF_INET6; 1237 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1238 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1239 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1240 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1241 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1242 rt->mf6c_expire = UPCALL_EXPIRE; 1243 n6expire[hash]++; 1244 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1245 1246 /* link into table */ 1247 rt->mf6c_next = mf6ctable[hash]; 1248 mf6ctable[hash] = rt; 1249 /* Add this entry to the end of the queue */ 1250 rt->mf6c_stall = rte; 1251 } else { 1252 /* determine if q has overflowed */ 1253 struct rtdetq **p; 1254 int npkts = 0; 1255 1256 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1257 if (++npkts > MAX_UPQ6) { 1258 MRT6STAT_INC(mrt6s_upq_ovflw); 1259 free(rte, M_MRTABLE6); 1260 m_freem(mb0); 1261 MFC6_UNLOCK(); 1262 return (0); 1263 } 1264 1265 /* Add this entry to the end of the queue */ 1266 *p = rte; 1267 } 1268 1269 rte->next = NULL; 1270 rte->m = mb0; 1271 rte->ifp = ifp; 1272 #ifdef UPCALL_TIMING 1273 rte->t = tp; 1274 #endif /* UPCALL_TIMING */ 1275 1276 MFC6_UNLOCK(); 1277 1278 return (0); 1279 } 1280 1281 /* 1282 * Clean up cache entries if upcalls are not serviced 1283 * Call from the Slow Timeout mechanism, every half second. 1284 */ 1285 static void 1286 expire_upcalls(void *unused) 1287 { 1288 #ifdef MRT6DEBUG 1289 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1290 #endif 1291 struct rtdetq *rte; 1292 struct mf6c *mfc, **nptr; 1293 u_long i; 1294 1295 MFC6_LOCK(); 1296 for (i = 0; i < MF6CTBLSIZ; i++) { 1297 if (n6expire[i] == 0) 1298 continue; 1299 nptr = &mf6ctable[i]; 1300 while ((mfc = *nptr) != NULL) { 1301 rte = mfc->mf6c_stall; 1302 /* 1303 * Skip real cache entries 1304 * Make sure it wasn't marked to not expire (shouldn't happen) 1305 * If it expires now 1306 */ 1307 if (rte != NULL && 1308 mfc->mf6c_expire != 0 && 1309 --mfc->mf6c_expire == 0) { 1310 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1311 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1312 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1313 /* 1314 * drop all the packets 1315 * free the mbuf with the pkt, if, timing info 1316 */ 1317 do { 1318 struct rtdetq *n = rte->next; 1319 m_freem(rte->m); 1320 free(rte, M_MRTABLE6); 1321 rte = n; 1322 } while (rte != NULL); 1323 MRT6STAT_INC(mrt6s_cache_cleanups); 1324 n6expire[i]--; 1325 1326 *nptr = mfc->mf6c_next; 1327 free(mfc, M_MRTABLE6); 1328 } else { 1329 nptr = &mfc->mf6c_next; 1330 } 1331 } 1332 } 1333 MFC6_UNLOCK(); 1334 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1335 expire_upcalls, NULL); 1336 } 1337 1338 /* 1339 * Packet forwarding routine once entry in the cache is made 1340 */ 1341 static int 1342 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1343 { 1344 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1345 mifi_t mifi, iif; 1346 struct mif6 *mifp; 1347 int plen = m->m_pkthdr.len; 1348 struct in6_addr src0, dst0; /* copies for local work */ 1349 u_int32_t iszone, idzone, oszone, odzone; 1350 int error = 0; 1351 1352 /* 1353 * Macro to send packet on mif. Since RSVP packets don't get counted on 1354 * input, they shouldn't get counted on output, so statistics keeping is 1355 * separate. 1356 */ 1357 1358 #define MC6_SEND(ip6, mifp, m) do { \ 1359 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1360 register_send((ip6), (mifp), (m)); \ 1361 else \ 1362 phyint_send((ip6), (mifp), (m)); \ 1363 } while (/*CONSTCOND*/ 0) 1364 1365 /* 1366 * Don't forward if it didn't arrive from the parent mif 1367 * for its origin. 1368 */ 1369 mifi = rt->mf6c_parent; 1370 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1371 /* came in the wrong interface */ 1372 MRT6_DLOG(DEBUG_FORWARD, 1373 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1374 mifi, mif6table[mifi].m6_ifp->if_index); 1375 MRT6STAT_INC(mrt6s_wrong_if); 1376 rt->mf6c_wrong_if++; 1377 /* 1378 * If we are doing PIM processing, and we are forwarding 1379 * packets on this interface, send a message to the 1380 * routing daemon. 1381 */ 1382 /* have to make sure this is a valid mif */ 1383 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1384 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1385 /* 1386 * Check the M_LOOP flag to avoid an 1387 * unnecessary PIM assert. 1388 * XXX: M_LOOP is an ad-hoc hack... 1389 */ 1390 static struct sockaddr_in6 sin6 = 1391 { sizeof(sin6), AF_INET6 }; 1392 1393 struct mbuf *mm; 1394 struct mrt6msg *im; 1395 #ifdef MRT6_OINIT 1396 struct omrt6msg *oim; 1397 #endif 1398 1399 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1400 if (mm && 1401 (M_HASCL(mm) || 1402 mm->m_len < sizeof(struct ip6_hdr))) 1403 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1404 if (mm == NULL) 1405 return (ENOBUFS); 1406 1407 #ifdef MRT6_OINIT 1408 oim = NULL; 1409 #endif 1410 im = NULL; 1411 switch (V_ip6_mrouter_ver) { 1412 #ifdef MRT6_OINIT 1413 case MRT6_OINIT: 1414 oim = mtod(mm, struct omrt6msg *); 1415 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1416 oim->im6_mbz = 0; 1417 break; 1418 #endif 1419 case MRT6_INIT: 1420 im = mtod(mm, struct mrt6msg *); 1421 im->im6_msgtype = MRT6MSG_WRONGMIF; 1422 im->im6_mbz = 0; 1423 break; 1424 default: 1425 m_freem(mm); 1426 return (EINVAL); 1427 } 1428 1429 for (mifp = mif6table, iif = 0; 1430 iif < nummifs && mifp && 1431 mifp->m6_ifp != ifp; 1432 mifp++, iif++) 1433 ; 1434 1435 switch (V_ip6_mrouter_ver) { 1436 #ifdef MRT6_OINIT 1437 case MRT6_OINIT: 1438 oim->im6_mif = iif; 1439 sin6.sin6_addr = oim->im6_src; 1440 break; 1441 #endif 1442 case MRT6_INIT: 1443 im->im6_mif = iif; 1444 sin6.sin6_addr = im->im6_src; 1445 break; 1446 } 1447 1448 MRT6STAT_INC(mrt6s_upcalls); 1449 1450 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1451 MRT6_DLOG(DEBUG_ANY, 1452 "ip6_mrouter socket queue full"); 1453 MRT6STAT_INC(mrt6s_upq_sockfull); 1454 return (ENOBUFS); 1455 } /* if socket Q full */ 1456 } /* if PIM */ 1457 return (0); 1458 } /* if wrong iif */ 1459 1460 /* If I sourced this packet, it counts as output, else it was input. */ 1461 if (m->m_pkthdr.rcvif == NULL) { 1462 /* XXX: is rcvif really NULL when output?? */ 1463 mif6table[mifi].m6_pkt_out++; 1464 mif6table[mifi].m6_bytes_out += plen; 1465 } else { 1466 mif6table[mifi].m6_pkt_in++; 1467 mif6table[mifi].m6_bytes_in += plen; 1468 } 1469 rt->mf6c_pkt_cnt++; 1470 rt->mf6c_byte_cnt += plen; 1471 1472 /* 1473 * For each mif, forward a copy of the packet if there are group 1474 * members downstream on the interface. 1475 */ 1476 src0 = ip6->ip6_src; 1477 dst0 = ip6->ip6_dst; 1478 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1479 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1480 IP6STAT_INC(ip6s_badscope); 1481 return (error); 1482 } 1483 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1484 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1485 /* 1486 * check if the outgoing packet is going to break 1487 * a scope boundary. 1488 * XXX For packets through PIM register tunnel 1489 * interface, we believe a routing daemon. 1490 */ 1491 if (!(mif6table[rt->mf6c_parent].m6_flags & 1492 MIFF_REGISTER) && 1493 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1494 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1495 &oszone) || 1496 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1497 &odzone) || 1498 iszone != oszone || 1499 idzone != odzone) { 1500 IP6STAT_INC(ip6s_badscope); 1501 continue; 1502 } 1503 } 1504 1505 mifp->m6_pkt_out++; 1506 mifp->m6_bytes_out += plen; 1507 MC6_SEND(ip6, mifp, m); 1508 } 1509 } 1510 return (0); 1511 } 1512 1513 static void 1514 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1515 { 1516 #ifdef MRT6DEBUG 1517 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1518 #endif 1519 struct mbuf *mb_copy; 1520 struct ifnet *ifp = mifp->m6_ifp; 1521 int error = 0; 1522 u_long linkmtu; 1523 1524 /* 1525 * Make a new reference to the packet; make sure that 1526 * the IPv6 header is actually copied, not just referenced, 1527 * so that ip6_output() only scribbles on the copy. 1528 */ 1529 mb_copy = m_copy(m, 0, M_COPYALL); 1530 if (mb_copy && 1531 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1532 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1533 if (mb_copy == NULL) { 1534 return; 1535 } 1536 /* set MCAST flag to the outgoing packet */ 1537 mb_copy->m_flags |= M_MCAST; 1538 1539 /* 1540 * If we sourced the packet, call ip6_output since we may devide 1541 * the packet into fragments when the packet is too big for the 1542 * outgoing interface. 1543 * Otherwise, we can simply send the packet to the interface 1544 * sending queue. 1545 */ 1546 if (m->m_pkthdr.rcvif == NULL) { 1547 struct ip6_moptions im6o; 1548 1549 im6o.im6o_multicast_ifp = ifp; 1550 /* XXX: ip6_output will override ip6->ip6_hlim */ 1551 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1552 im6o.im6o_multicast_loop = 1; 1553 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1554 NULL, NULL); 1555 1556 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1557 (uint16_t)(mifp - mif6table), error); 1558 return; 1559 } 1560 1561 /* 1562 * If configured to loop back multicasts by default, 1563 * loop back a copy now. 1564 */ 1565 if (in6_mcast_loop) { 1566 struct sockaddr_in6 dst6; 1567 1568 bzero(&dst6, sizeof(dst6)); 1569 dst6.sin6_len = sizeof(struct sockaddr_in6); 1570 dst6.sin6_family = AF_INET6; 1571 dst6.sin6_addr = ip6->ip6_dst; 1572 ip6_mloopback(ifp, m, &dst6); 1573 } 1574 1575 /* 1576 * Put the packet into the sending queue of the outgoing interface 1577 * if it would fit in the MTU of the interface. 1578 */ 1579 linkmtu = IN6_LINKMTU(ifp); 1580 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1581 struct sockaddr_in6 dst6; 1582 1583 bzero(&dst6, sizeof(dst6)); 1584 dst6.sin6_len = sizeof(struct sockaddr_in6); 1585 dst6.sin6_family = AF_INET6; 1586 dst6.sin6_addr = ip6->ip6_dst; 1587 1588 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1589 /* 1590 * We just call if_output instead of nd6_output here, since 1591 * we need no ND for a multicast forwarded packet...right? 1592 */ 1593 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1594 error = (*ifp->if_output)(ifp, mb_copy, 1595 (struct sockaddr *)&dst6, NULL); 1596 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1597 (uint16_t)(mifp - mif6table), error); 1598 } else { 1599 /* 1600 * pMTU discovery is intentionally disabled by default, since 1601 * various router may notify pMTU in multicast, which can be 1602 * a DDoS to a router 1603 */ 1604 if (V_ip6_mcast_pmtu) 1605 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1606 else { 1607 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1608 "g %s size %d (discarded)", if_name(ifp), 1609 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1610 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1611 mb_copy->m_pkthdr.len); 1612 m_freem(mb_copy); /* simply discard the packet */ 1613 } 1614 } 1615 } 1616 1617 static int 1618 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1619 { 1620 #ifdef MRT6DEBUG 1621 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1622 #endif 1623 struct mbuf *mm; 1624 int i, len = m->m_pkthdr.len; 1625 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1626 struct mrt6msg *im6; 1627 1628 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1629 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1630 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1631 PIM6STAT_INC(pim6s_snd_registers); 1632 1633 /* Make a copy of the packet to send to the user level process. */ 1634 mm = m_gethdr(M_NOWAIT, MT_DATA); 1635 if (mm == NULL) 1636 return (ENOBUFS); 1637 mm->m_data += max_linkhdr; 1638 mm->m_len = sizeof(struct ip6_hdr); 1639 1640 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1641 m_freem(mm); 1642 return (ENOBUFS); 1643 } 1644 i = MHLEN - M_LEADINGSPACE(mm); 1645 if (i > len) 1646 i = len; 1647 mm = m_pullup(mm, i); 1648 if (mm == NULL) 1649 return (ENOBUFS); 1650 /* TODO: check it! */ 1651 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1652 1653 /* 1654 * Send message to routing daemon 1655 */ 1656 sin6.sin6_addr = ip6->ip6_src; 1657 1658 im6 = mtod(mm, struct mrt6msg *); 1659 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1660 im6->im6_mbz = 0; 1661 1662 im6->im6_mif = mif - mif6table; 1663 1664 /* iif info is not given for reg. encap.n */ 1665 MRT6STAT_INC(mrt6s_upcalls); 1666 1667 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1668 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1669 MRT6STAT_INC(mrt6s_upq_sockfull); 1670 return (ENOBUFS); 1671 } 1672 return (0); 1673 } 1674 1675 /* 1676 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1677 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1678 * into the kernel. 1679 */ 1680 static int 1681 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1682 { 1683 1684 #ifdef DIAGNOSTIC 1685 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1686 #endif 1687 if (proto != IPPROTO_PIM) 1688 return 0; /* not for us; reject the datagram. */ 1689 1690 return 64; /* claim the datagram. */ 1691 } 1692 1693 /* 1694 * PIM sparse mode hook 1695 * Receives the pim control messages, and passes them up to the listening 1696 * socket, using rip6_input. 1697 * The only message processed is the REGISTER pim message; the pim header 1698 * is stripped off, and the inner packet is passed to register_mforward. 1699 */ 1700 int 1701 pim6_input(struct mbuf **mp, int *offp, int proto) 1702 { 1703 struct pim *pim; /* pointer to a pim struct */ 1704 struct ip6_hdr *ip6; 1705 int pimlen; 1706 struct mbuf *m = *mp; 1707 int minlen; 1708 int off = *offp; 1709 1710 PIM6STAT_INC(pim6s_rcv_total); 1711 1712 ip6 = mtod(m, struct ip6_hdr *); 1713 pimlen = m->m_pkthdr.len - *offp; 1714 1715 /* 1716 * Validate lengths 1717 */ 1718 if (pimlen < PIM_MINLEN) { 1719 PIM6STAT_INC(pim6s_rcv_tooshort); 1720 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1721 m_freem(m); 1722 return (IPPROTO_DONE); 1723 } 1724 1725 /* 1726 * if the packet is at least as big as a REGISTER, go ahead 1727 * and grab the PIM REGISTER header size, to avoid another 1728 * possible m_pullup() later. 1729 * 1730 * PIM_MINLEN == pimhdr + u_int32 == 8 1731 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1732 */ 1733 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1734 1735 /* 1736 * Make sure that the IP6 and PIM headers in contiguous memory, and 1737 * possibly the PIM REGISTER header 1738 */ 1739 #ifndef PULLDOWN_TEST 1740 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1741 /* adjust pointer */ 1742 ip6 = mtod(m, struct ip6_hdr *); 1743 1744 /* adjust mbuf to point to the PIM header */ 1745 pim = (struct pim *)((caddr_t)ip6 + off); 1746 #else 1747 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1748 if (pim == NULL) { 1749 PIM6STAT_INC(pim6s_rcv_tooshort); 1750 return (IPPROTO_DONE); 1751 } 1752 #endif 1753 1754 #define PIM6_CHECKSUM 1755 #ifdef PIM6_CHECKSUM 1756 { 1757 int cksumlen; 1758 1759 /* 1760 * Validate checksum. 1761 * If PIM REGISTER, exclude the data packet 1762 */ 1763 if (pim->pim_type == PIM_REGISTER) 1764 cksumlen = PIM_MINLEN; 1765 else 1766 cksumlen = pimlen; 1767 1768 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1769 PIM6STAT_INC(pim6s_rcv_badsum); 1770 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1771 m_freem(m); 1772 return (IPPROTO_DONE); 1773 } 1774 } 1775 #endif /* PIM_CHECKSUM */ 1776 1777 /* PIM version check */ 1778 if (pim->pim_ver != PIM_VERSION) { 1779 PIM6STAT_INC(pim6s_rcv_badversion); 1780 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1781 "incorrect version %d, expecting %d", 1782 pim->pim_ver, PIM_VERSION); 1783 m_freem(m); 1784 return (IPPROTO_DONE); 1785 } 1786 1787 if (pim->pim_type == PIM_REGISTER) { 1788 /* 1789 * since this is a REGISTER, we'll make a copy of the register 1790 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1791 * routing daemon. 1792 */ 1793 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1794 1795 struct mbuf *mcp; 1796 struct ip6_hdr *eip6; 1797 u_int32_t *reghdr; 1798 int rc; 1799 #ifdef MRT6DEBUG 1800 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1801 #endif 1802 1803 PIM6STAT_INC(pim6s_rcv_registers); 1804 1805 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1806 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1807 reg_mif_num); 1808 m_freem(m); 1809 return (IPPROTO_DONE); 1810 } 1811 1812 reghdr = (u_int32_t *)(pim + 1); 1813 1814 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1815 goto pim6_input_to_daemon; 1816 1817 /* 1818 * Validate length 1819 */ 1820 if (pimlen < PIM6_REG_MINLEN) { 1821 PIM6STAT_INC(pim6s_rcv_tooshort); 1822 PIM6STAT_INC(pim6s_rcv_badregisters); 1823 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1824 "size too small %d from %s", 1825 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1826 m_freem(m); 1827 return (IPPROTO_DONE); 1828 } 1829 1830 eip6 = (struct ip6_hdr *) (reghdr + 1); 1831 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1832 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1833 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1834 ntohs(eip6->ip6_plen)); 1835 1836 /* verify the version number of the inner packet */ 1837 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1838 PIM6STAT_INC(pim6s_rcv_badregisters); 1839 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1840 "of the inner packet", 1841 (eip6->ip6_vfc & IPV6_VERSION)); 1842 m_freem(m); 1843 return (IPPROTO_DONE); 1844 } 1845 1846 /* verify the inner packet is destined to a mcast group */ 1847 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1848 PIM6STAT_INC(pim6s_rcv_badregisters); 1849 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1850 "is not multicast %s", 1851 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1852 m_freem(m); 1853 return (IPPROTO_DONE); 1854 } 1855 1856 /* 1857 * make a copy of the whole header to pass to the daemon later. 1858 */ 1859 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1860 if (mcp == NULL) { 1861 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1862 "could not copy register head"); 1863 m_freem(m); 1864 return (IPPROTO_DONE); 1865 } 1866 1867 /* 1868 * forward the inner ip6 packet; point m_data at the inner ip6. 1869 */ 1870 m_adj(m, off + PIM_MINLEN); 1871 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1872 "src %s, dst %s, mif %d", 1873 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1874 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1875 1876 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1877 dst.sin6_family, 0); 1878 1879 /* prepare the register head to send to the mrouting daemon */ 1880 m = mcp; 1881 } 1882 1883 /* 1884 * Pass the PIM message up to the daemon; if it is a register message 1885 * pass the 'head' only up to the daemon. This includes the 1886 * encapsulator ip6 header, pim header, register header and the 1887 * encapsulated ip6 header. 1888 */ 1889 pim6_input_to_daemon: 1890 rip6_input(&m, offp, proto); 1891 return (IPPROTO_DONE); 1892 } 1893 1894 static int 1895 ip6_mroute_modevent(module_t mod, int type, void *unused) 1896 { 1897 1898 switch (type) { 1899 case MOD_LOAD: 1900 MROUTER6_LOCK_INIT(); 1901 MFC6_LOCK_INIT(); 1902 MIF6_LOCK_INIT(); 1903 1904 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 1905 pim6_encapcheck, 1906 (const struct protosw *)&in6_pim_protosw, NULL); 1907 if (pim6_encap_cookie == NULL) { 1908 printf("ip6_mroute: unable to attach pim6 encap\n"); 1909 MIF6_LOCK_DESTROY(); 1910 MFC6_LOCK_DESTROY(); 1911 MROUTER6_LOCK_DESTROY(); 1912 return (EINVAL); 1913 } 1914 1915 ip6_mforward = X_ip6_mforward; 1916 ip6_mrouter_done = X_ip6_mrouter_done; 1917 ip6_mrouter_get = X_ip6_mrouter_get; 1918 ip6_mrouter_set = X_ip6_mrouter_set; 1919 mrt6_ioctl = X_mrt6_ioctl; 1920 break; 1921 1922 case MOD_UNLOAD: 1923 if (V_ip6_mrouter != NULL) 1924 return EINVAL; 1925 1926 if (pim6_encap_cookie) { 1927 encap_detach(pim6_encap_cookie); 1928 pim6_encap_cookie = NULL; 1929 } 1930 X_ip6_mrouter_done(); 1931 ip6_mforward = NULL; 1932 ip6_mrouter_done = NULL; 1933 ip6_mrouter_get = NULL; 1934 ip6_mrouter_set = NULL; 1935 mrt6_ioctl = NULL; 1936 1937 MIF6_LOCK_DESTROY(); 1938 MFC6_LOCK_DESTROY(); 1939 MROUTER6_LOCK_DESTROY(); 1940 break; 1941 1942 default: 1943 return (EOPNOTSUPP); 1944 } 1945 1946 return (0); 1947 } 1948 1949 static moduledata_t ip6_mroutemod = { 1950 "ip6_mroute", 1951 ip6_mroute_modevent, 1952 0 1953 }; 1954 1955 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: a899adb43410c16bb656e80d093db884
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