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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: releng/8.4/sys/netinet6/ip6_mroute.c 243677 2012-11-29 17:41:19Z ae $"); 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/signalvar.h> 97 #include <sys/socket.h> 98 #include <sys/socketvar.h> 99 #include <sys/sockio.h> 100 #include <sys/sx.h> 101 #include <sys/sysctl.h> 102 #include <sys/syslog.h> 103 #include <sys/systm.h> 104 #include <sys/time.h> 105 106 #include <net/if.h> 107 #include <net/if_types.h> 108 #include <net/raw_cb.h> 109 #include <net/vnet.h> 110 111 #include <netinet/in.h> 112 #include <netinet/in_var.h> 113 #include <netinet/icmp6.h> 114 #include <netinet/ip_encap.h> 115 116 #include <netinet/ip6.h> 117 #include <netinet6/ip6_var.h> 118 #include <netinet6/scope6_var.h> 119 #include <netinet6/nd6.h> 120 #include <netinet6/ip6_mroute.h> 121 #include <netinet6/ip6protosw.h> 122 #include <netinet6/pim6.h> 123 #include <netinet6/pim6_var.h> 124 125 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 126 127 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 128 #define M_HASCL(m) ((m)->m_flags & M_EXT) 129 130 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 131 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 132 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 133 static int set_pim6(int *); 134 static int socket_send(struct socket *, struct mbuf *, 135 struct sockaddr_in6 *); 136 137 extern int in6_mcast_loop; 138 extern struct domain inet6domain; 139 140 static const struct encaptab *pim6_encap_cookie; 141 static const struct ip6protosw in6_pim_protosw = { 142 .pr_type = SOCK_RAW, 143 .pr_domain = &inet6domain, 144 .pr_protocol = IPPROTO_PIM, 145 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 146 .pr_input = pim6_input, 147 .pr_output = rip6_output, 148 .pr_ctloutput = rip6_ctloutput, 149 .pr_usrreqs = &rip6_usrreqs 150 }; 151 static int pim6_encapcheck(const struct mbuf *, int, int, void *); 152 153 static VNET_DEFINE(int, ip6_mrouter_ver) = 0; 154 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 155 156 SYSCTL_DECL(_net_inet6); 157 SYSCTL_DECL(_net_inet6_ip6); 158 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 159 160 static struct mrt6stat mrt6stat; 161 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 162 &mrt6stat, mrt6stat, 163 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 164 165 #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 #endif 221 222 static void expire_upcalls(void *); 223 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 224 #define UPCALL_EXPIRE 6 /* number of timeouts */ 225 226 /* 227 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 228 */ 229 230 /* 231 * 'Interfaces' associated with decapsulator (so we can tell 232 * packets that went through it from ones that get reflected 233 * by a broken gateway). Different from IPv4 register_if, 234 * these interfaces are linked into the system ifnet list, 235 * because per-interface IPv6 statistics are maintained in 236 * ifp->if_afdata. But it does not have any routes point 237 * to them. I.e., packets can't be sent this way. They 238 * only exist as a placeholder for multicast source 239 * verification. 240 */ 241 static struct ifnet *multicast_register_if6; 242 243 #define ENCAP_HOPS 64 244 245 /* 246 * Private variables. 247 */ 248 static mifi_t nummifs = 0; 249 static mifi_t reg_mif_num = (mifi_t)-1; 250 251 static struct pim6stat pim6stat; 252 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 253 &pim6stat, pim6stat, 254 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 255 256 static VNET_DEFINE(int, pim6); 257 #define V_pim6 VNET(pim6) 258 259 /* 260 * Hash function for a source, group entry 261 */ 262 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 263 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 264 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 265 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 266 267 /* 268 * Find a route for a given origin IPv6 address and Multicast group address. 269 */ 270 #define MF6CFIND(o, g, rt) do { \ 271 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 272 rt = NULL; \ 273 mrt6stat.mrt6s_mfc_lookups++; \ 274 while (_rt) { \ 275 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 276 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 277 (_rt->mf6c_stall == NULL)) { \ 278 rt = _rt; \ 279 break; \ 280 } \ 281 _rt = _rt->mf6c_next; \ 282 } \ 283 if (rt == NULL) { \ 284 mrt6stat.mrt6s_mfc_misses++; \ 285 } \ 286 } while (/*CONSTCOND*/ 0) 287 288 /* 289 * Macros to compute elapsed time efficiently 290 * Borrowed from Van Jacobson's scheduling code 291 * XXX: replace with timersub() ? 292 */ 293 #define TV_DELTA(a, b, delta) do { \ 294 int xxs; \ 295 \ 296 delta = (a).tv_usec - (b).tv_usec; \ 297 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 298 switch (xxs) { \ 299 case 2: \ 300 delta += 1000000; \ 301 /* FALLTHROUGH */ \ 302 case 1: \ 303 delta += 1000000; \ 304 break; \ 305 default: \ 306 delta += (1000000 * xxs); \ 307 } \ 308 } \ 309 } while (/*CONSTCOND*/ 0) 310 311 /* XXX: replace with timercmp(a, b, <) ? */ 312 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 313 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 314 315 #ifdef UPCALL_TIMING 316 #define UPCALL_MAX 50 317 static u_long upcall_data[UPCALL_MAX + 1]; 318 static void collate(); 319 #endif /* UPCALL_TIMING */ 320 321 static int ip6_mrouter_init(struct socket *, int, int); 322 static int add_m6fc(struct mf6cctl *); 323 static int add_m6if(struct mif6ctl *); 324 static int del_m6fc(struct mf6cctl *); 325 static int del_m6if(mifi_t *); 326 static int del_m6if_locked(mifi_t *); 327 static int get_mif6_cnt(struct sioc_mif_req6 *); 328 static int get_sg_cnt(struct sioc_sg_req6 *); 329 330 static struct callout expire_upcalls_ch; 331 332 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 333 int X_ip6_mrouter_done(void); 334 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 335 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 336 int X_mrt6_ioctl(u_long, caddr_t); 337 338 /* 339 * Handle MRT setsockopt commands to modify the multicast routing tables. 340 */ 341 int 342 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 343 { 344 int error = 0; 345 int optval; 346 struct mif6ctl mifc; 347 struct mf6cctl mfcc; 348 mifi_t mifi; 349 350 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 351 return (EACCES); 352 353 switch (sopt->sopt_name) { 354 case MRT6_INIT: 355 #ifdef MRT6_OINIT 356 case MRT6_OINIT: 357 #endif 358 error = sooptcopyin(sopt, &optval, sizeof(optval), 359 sizeof(optval)); 360 if (error) 361 break; 362 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 363 break; 364 case MRT6_DONE: 365 error = X_ip6_mrouter_done(); 366 break; 367 case MRT6_ADD_MIF: 368 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 369 if (error) 370 break; 371 error = add_m6if(&mifc); 372 break; 373 case MRT6_ADD_MFC: 374 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 375 if (error) 376 break; 377 error = add_m6fc(&mfcc); 378 break; 379 case MRT6_DEL_MFC: 380 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 381 if (error) 382 break; 383 error = del_m6fc(&mfcc); 384 break; 385 case MRT6_DEL_MIF: 386 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 387 if (error) 388 break; 389 error = del_m6if(&mifi); 390 break; 391 case MRT6_PIM: 392 error = sooptcopyin(sopt, &optval, sizeof(optval), 393 sizeof(optval)); 394 if (error) 395 break; 396 error = set_pim6(&optval); 397 break; 398 default: 399 error = EOPNOTSUPP; 400 break; 401 } 402 403 return (error); 404 } 405 406 /* 407 * Handle MRT getsockopt commands 408 */ 409 int 410 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 411 { 412 int error = 0; 413 414 if (so != V_ip6_mrouter) 415 return (EACCES); 416 417 switch (sopt->sopt_name) { 418 case MRT6_PIM: 419 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 420 break; 421 } 422 return (error); 423 } 424 425 /* 426 * Handle ioctl commands to obtain information from the cache 427 */ 428 int 429 X_mrt6_ioctl(u_long cmd, caddr_t data) 430 { 431 int ret; 432 433 ret = EINVAL; 434 435 switch (cmd) { 436 case SIOCGETSGCNT_IN6: 437 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 438 break; 439 440 case SIOCGETMIFCNT_IN6: 441 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 442 break; 443 444 default: 445 break; 446 } 447 448 return (ret); 449 } 450 451 /* 452 * returns the packet, byte, rpf-failure count for the source group provided 453 */ 454 static int 455 get_sg_cnt(struct sioc_sg_req6 *req) 456 { 457 struct mf6c *rt; 458 int ret; 459 460 ret = 0; 461 462 MFC6_LOCK(); 463 464 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 465 if (rt == NULL) { 466 ret = ESRCH; 467 } else { 468 req->pktcnt = rt->mf6c_pkt_cnt; 469 req->bytecnt = rt->mf6c_byte_cnt; 470 req->wrong_if = rt->mf6c_wrong_if; 471 } 472 473 MFC6_UNLOCK(); 474 475 return (ret); 476 } 477 478 /* 479 * returns the input and output packet and byte counts on the mif provided 480 */ 481 static int 482 get_mif6_cnt(struct sioc_mif_req6 *req) 483 { 484 mifi_t mifi; 485 int ret; 486 487 ret = 0; 488 mifi = req->mifi; 489 490 MIF6_LOCK(); 491 492 if (mifi >= nummifs) { 493 ret = EINVAL; 494 } else { 495 req->icount = mif6table[mifi].m6_pkt_in; 496 req->ocount = mif6table[mifi].m6_pkt_out; 497 req->ibytes = mif6table[mifi].m6_bytes_in; 498 req->obytes = mif6table[mifi].m6_bytes_out; 499 } 500 501 MIF6_UNLOCK(); 502 503 return (ret); 504 } 505 506 static int 507 set_pim6(int *i) 508 { 509 if ((*i != 1) && (*i != 0)) 510 return (EINVAL); 511 512 V_pim6 = *i; 513 514 return (0); 515 } 516 517 /* 518 * Enable multicast routing 519 */ 520 static int 521 ip6_mrouter_init(struct socket *so, int v, int cmd) 522 { 523 524 #ifdef MRT6DEBUG 525 if (V_mrt6debug) 526 log(LOG_DEBUG, 527 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 528 so->so_type, so->so_proto->pr_protocol); 529 #endif 530 531 if (so->so_type != SOCK_RAW || 532 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 533 return (EOPNOTSUPP); 534 535 if (v != 1) 536 return (ENOPROTOOPT); 537 538 MROUTER6_LOCK(); 539 540 if (V_ip6_mrouter != NULL) { 541 MROUTER6_UNLOCK(); 542 return (EADDRINUSE); 543 } 544 545 V_ip6_mrouter = so; 546 V_ip6_mrouter_ver = cmd; 547 548 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 549 bzero((caddr_t)n6expire, sizeof(n6expire)); 550 551 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 552 553 callout_init(&expire_upcalls_ch, 0); 554 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 555 expire_upcalls, NULL); 556 557 MROUTER6_UNLOCK(); 558 559 #ifdef MRT6DEBUG 560 if (V_mrt6debug) 561 log(LOG_DEBUG, "ip6_mrouter_init\n"); 562 #endif 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 int 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_free(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(); 640 641 #ifdef MRT6DEBUG 642 if (V_mrt6debug) 643 log(LOG_DEBUG, "ip6_mrouter_done\n"); 644 #endif 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 bzero(&mifp->m6_route, sizeof(mifp->m6_route)); 720 721 /* Adjust nummifs up if the mifi is higher than nummifs */ 722 if (nummifs <= mifcp->mif6c_mifi) 723 nummifs = mifcp->mif6c_mifi + 1; 724 725 MIF6_UNLOCK(); 726 727 #ifdef MRT6DEBUG 728 if (V_mrt6debug) 729 log(LOG_DEBUG, 730 "add_mif #%d, phyint %s\n", 731 mifcp->mif6c_mifi, 732 ifp->if_xname); 733 #endif 734 735 return (0); 736 } 737 738 /* 739 * Delete a mif from the mif table 740 */ 741 static int 742 del_m6if_locked(mifi_t *mifip) 743 { 744 struct mif6 *mifp = mif6table + *mifip; 745 mifi_t mifi; 746 struct ifnet *ifp; 747 748 MIF6_LOCK_ASSERT(); 749 750 if (*mifip >= nummifs) 751 return (EINVAL); 752 if (mifp->m6_ifp == NULL) 753 return (EINVAL); 754 755 if (!(mifp->m6_flags & MIFF_REGISTER)) { 756 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 757 ifp = mifp->m6_ifp; 758 if_allmulti(ifp, 0); 759 } else { 760 if (reg_mif_num != (mifi_t)-1 && 761 multicast_register_if6 != NULL) { 762 if_detach(multicast_register_if6); 763 if_free(multicast_register_if6); 764 reg_mif_num = (mifi_t)-1; 765 multicast_register_if6 = NULL; 766 } 767 } 768 769 bzero((caddr_t)mifp, sizeof(*mifp)); 770 771 /* Adjust nummifs down */ 772 for (mifi = nummifs; mifi > 0; mifi--) 773 if (mif6table[mifi - 1].m6_ifp) 774 break; 775 nummifs = mifi; 776 777 #ifdef MRT6DEBUG 778 if (V_mrt6debug) 779 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 780 #endif 781 782 return (0); 783 } 784 785 static int 786 del_m6if(mifi_t *mifip) 787 { 788 int cc; 789 790 MIF6_LOCK(); 791 cc = del_m6if_locked(mifip); 792 MIF6_UNLOCK(); 793 794 return (cc); 795 } 796 797 /* 798 * Add an mfc entry 799 */ 800 static int 801 add_m6fc(struct mf6cctl *mfccp) 802 { 803 struct mf6c *rt; 804 u_long hash; 805 struct rtdetq *rte; 806 u_short nstl; 807 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 808 809 MFC6_LOCK(); 810 811 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 812 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 813 814 /* If an entry already exists, just update the fields */ 815 if (rt) { 816 #ifdef MRT6DEBUG 817 if (V_mrt6debug & DEBUG_MFC) { 818 log(LOG_DEBUG, 819 "add_m6fc no upcall h %d o %s g %s p %x\n", 820 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 821 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 822 mfccp->mf6cc_parent); 823 } 824 #endif 825 826 rt->mf6c_parent = mfccp->mf6cc_parent; 827 rt->mf6c_ifset = mfccp->mf6cc_ifset; 828 829 MFC6_UNLOCK(); 830 return (0); 831 } 832 833 /* 834 * Find the entry for which the upcall was made and update 835 */ 836 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 837 mfccp->mf6cc_mcastgrp.sin6_addr); 838 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 839 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 840 &mfccp->mf6cc_origin.sin6_addr) && 841 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 842 &mfccp->mf6cc_mcastgrp.sin6_addr) && 843 (rt->mf6c_stall != NULL)) { 844 845 if (nstl++) 846 log(LOG_ERR, 847 "add_m6fc: %s o %s g %s p %x dbx %p\n", 848 "multiple kernel entries", 849 ip6_sprintf(ip6bufo, 850 &mfccp->mf6cc_origin.sin6_addr), 851 ip6_sprintf(ip6bufg, 852 &mfccp->mf6cc_mcastgrp.sin6_addr), 853 mfccp->mf6cc_parent, rt->mf6c_stall); 854 855 #ifdef MRT6DEBUG 856 if (V_mrt6debug & DEBUG_MFC) 857 log(LOG_DEBUG, 858 "add_m6fc o %s g %s p %x dbg %x\n", 859 ip6_sprintf(ip6bufo, 860 &mfccp->mf6cc_origin.sin6_addr), 861 ip6_sprintf(ip6bufg, 862 &mfccp->mf6cc_mcastgrp.sin6_addr), 863 mfccp->mf6cc_parent, rt->mf6c_stall); 864 #endif 865 866 rt->mf6c_origin = mfccp->mf6cc_origin; 867 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 868 rt->mf6c_parent = mfccp->mf6cc_parent; 869 rt->mf6c_ifset = mfccp->mf6cc_ifset; 870 /* initialize pkt counters per src-grp */ 871 rt->mf6c_pkt_cnt = 0; 872 rt->mf6c_byte_cnt = 0; 873 rt->mf6c_wrong_if = 0; 874 875 rt->mf6c_expire = 0; /* Don't clean this guy up */ 876 n6expire[hash]--; 877 878 /* free packets Qed at the end of this entry */ 879 for (rte = rt->mf6c_stall; rte != NULL; ) { 880 struct rtdetq *n = rte->next; 881 ip6_mdq(rte->m, rte->ifp, rt); 882 m_freem(rte->m); 883 #ifdef UPCALL_TIMING 884 collate(&(rte->t)); 885 #endif /* UPCALL_TIMING */ 886 free(rte, M_MRTABLE6); 887 rte = n; 888 } 889 rt->mf6c_stall = NULL; 890 } 891 } 892 893 /* 894 * It is possible that an entry is being inserted without an upcall 895 */ 896 if (nstl == 0) { 897 #ifdef MRT6DEBUG 898 if (V_mrt6debug & DEBUG_MFC) 899 log(LOG_DEBUG, 900 "add_mfc no upcall h %d o %s g %s p %x\n", 901 hash, 902 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 903 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 904 mfccp->mf6cc_parent); 905 #endif 906 907 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 908 909 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 910 &mfccp->mf6cc_origin.sin6_addr)&& 911 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 912 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 913 914 rt->mf6c_origin = mfccp->mf6cc_origin; 915 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 916 rt->mf6c_parent = mfccp->mf6cc_parent; 917 rt->mf6c_ifset = mfccp->mf6cc_ifset; 918 /* initialize pkt counters per src-grp */ 919 rt->mf6c_pkt_cnt = 0; 920 rt->mf6c_byte_cnt = 0; 921 rt->mf6c_wrong_if = 0; 922 923 if (rt->mf6c_expire) 924 n6expire[hash]--; 925 rt->mf6c_expire = 0; 926 } 927 } 928 if (rt == NULL) { 929 /* no upcall, so make a new entry */ 930 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 931 M_NOWAIT); 932 if (rt == NULL) { 933 MFC6_UNLOCK(); 934 return (ENOBUFS); 935 } 936 937 /* insert new entry at head of hash chain */ 938 rt->mf6c_origin = mfccp->mf6cc_origin; 939 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 940 rt->mf6c_parent = mfccp->mf6cc_parent; 941 rt->mf6c_ifset = mfccp->mf6cc_ifset; 942 /* initialize pkt counters per src-grp */ 943 rt->mf6c_pkt_cnt = 0; 944 rt->mf6c_byte_cnt = 0; 945 rt->mf6c_wrong_if = 0; 946 rt->mf6c_expire = 0; 947 rt->mf6c_stall = NULL; 948 949 /* link into table */ 950 rt->mf6c_next = mf6ctable[hash]; 951 mf6ctable[hash] = rt; 952 } 953 } 954 955 MFC6_UNLOCK(); 956 return (0); 957 } 958 959 #ifdef UPCALL_TIMING 960 /* 961 * collect delay statistics on the upcalls 962 */ 963 static void 964 collate(struct timeval *t) 965 { 966 u_long d; 967 struct timeval tp; 968 u_long delta; 969 970 GET_TIME(tp); 971 972 if (TV_LT(*t, tp)) 973 { 974 TV_DELTA(tp, *t, delta); 975 976 d = delta >> 10; 977 if (d > UPCALL_MAX) 978 d = UPCALL_MAX; 979 980 ++upcall_data[d]; 981 } 982 } 983 #endif /* UPCALL_TIMING */ 984 985 /* 986 * Delete an mfc entry 987 */ 988 static int 989 del_m6fc(struct mf6cctl *mfccp) 990 { 991 struct sockaddr_in6 origin; 992 struct sockaddr_in6 mcastgrp; 993 struct mf6c *rt; 994 struct mf6c **nptr; 995 u_long hash; 996 997 origin = mfccp->mf6cc_origin; 998 mcastgrp = mfccp->mf6cc_mcastgrp; 999 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1000 1001 #ifdef MRT6DEBUG 1002 if (V_mrt6debug & DEBUG_MFC) { 1003 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1004 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 1005 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1006 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1007 } 1008 #endif 1009 1010 MFC6_LOCK(); 1011 1012 nptr = &mf6ctable[hash]; 1013 while ((rt = *nptr) != NULL) { 1014 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1015 &rt->mf6c_origin.sin6_addr) && 1016 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1017 &rt->mf6c_mcastgrp.sin6_addr) && 1018 rt->mf6c_stall == NULL) 1019 break; 1020 1021 nptr = &rt->mf6c_next; 1022 } 1023 if (rt == NULL) { 1024 MFC6_UNLOCK(); 1025 return (EADDRNOTAVAIL); 1026 } 1027 1028 *nptr = rt->mf6c_next; 1029 free(rt, M_MRTABLE6); 1030 1031 MFC6_UNLOCK(); 1032 1033 return (0); 1034 } 1035 1036 static int 1037 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1038 { 1039 1040 if (s) { 1041 if (sbappendaddr(&s->so_rcv, 1042 (struct sockaddr *)src, 1043 mm, (struct mbuf *)0) != 0) { 1044 sorwakeup(s); 1045 return (0); 1046 } 1047 } 1048 m_freem(mm); 1049 return (-1); 1050 } 1051 1052 /* 1053 * IPv6 multicast forwarding function. This function assumes that the packet 1054 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1055 * pointed to by "ifp", and the packet is to be relayed to other networks 1056 * that have members of the packet's destination IPv6 multicast group. 1057 * 1058 * The packet is returned unscathed to the caller, unless it is 1059 * erroneous, in which case a non-zero return value tells the caller to 1060 * discard it. 1061 * 1062 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1063 * this function is called in the originating context (i.e., not when 1064 * forwarding a packet from other node). ip6_output(), which is currently the 1065 * only function that calls this function is called in the originating context, 1066 * explicitly ensures this condition. It is caller's responsibility to ensure 1067 * that if this function is called from somewhere else in the originating 1068 * context in the future. 1069 */ 1070 int 1071 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1072 { 1073 struct mf6c *rt; 1074 struct mif6 *mifp; 1075 struct mbuf *mm; 1076 mifi_t mifi; 1077 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1078 1079 #ifdef MRT6DEBUG 1080 if (V_mrt6debug & DEBUG_FORWARD) 1081 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1082 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1083 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1084 ifp->if_index); 1085 #endif 1086 1087 /* 1088 * Don't forward a packet with Hop limit of zero or one, 1089 * or a packet destined to a local-only group. 1090 */ 1091 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1092 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1093 return (0); 1094 ip6->ip6_hlim--; 1095 1096 /* 1097 * Source address check: do not forward packets with unspecified 1098 * source. It was discussed in July 2000, on ipngwg mailing list. 1099 * This is rather more serious than unicast cases, because some 1100 * MLD packets can be sent with the unspecified source address 1101 * (although such packets must normally set 1 to the hop limit field). 1102 */ 1103 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1104 V_ip6stat.ip6s_cantforward++; 1105 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1106 V_ip6_log_time = time_second; 1107 log(LOG_DEBUG, 1108 "cannot forward " 1109 "from %s to %s nxt %d received on %s\n", 1110 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1111 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1112 ip6->ip6_nxt, 1113 if_name(m->m_pkthdr.rcvif)); 1114 } 1115 return (0); 1116 } 1117 1118 MFC6_LOCK(); 1119 1120 /* 1121 * Determine forwarding mifs from the forwarding cache table 1122 */ 1123 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1124 1125 /* Entry exists, so forward if necessary */ 1126 if (rt) { 1127 MFC6_UNLOCK(); 1128 return (ip6_mdq(m, ifp, rt)); 1129 } else { 1130 /* 1131 * If we don't have a route for packet's origin, 1132 * Make a copy of the packet & 1133 * send message to routing daemon 1134 */ 1135 1136 struct mbuf *mb0; 1137 struct rtdetq *rte; 1138 u_long hash; 1139 /* int i, npkts;*/ 1140 #ifdef UPCALL_TIMING 1141 struct timeval tp; 1142 1143 GET_TIME(tp); 1144 #endif /* UPCALL_TIMING */ 1145 1146 mrt6stat.mrt6s_no_route++; 1147 #ifdef MRT6DEBUG 1148 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1149 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1150 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1151 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1152 #endif 1153 1154 /* 1155 * Allocate mbufs early so that we don't do extra work if we 1156 * are just going to fail anyway. 1157 */ 1158 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1159 M_NOWAIT); 1160 if (rte == NULL) { 1161 MFC6_UNLOCK(); 1162 return (ENOBUFS); 1163 } 1164 mb0 = m_copy(m, 0, M_COPYALL); 1165 /* 1166 * Pullup packet header if needed before storing it, 1167 * as other references may modify it in the meantime. 1168 */ 1169 if (mb0 && 1170 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1171 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1172 if (mb0 == NULL) { 1173 free(rte, M_MRTABLE6); 1174 MFC6_UNLOCK(); 1175 return (ENOBUFS); 1176 } 1177 1178 /* is there an upcall waiting for this packet? */ 1179 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1180 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1181 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1182 &rt->mf6c_origin.sin6_addr) && 1183 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1184 &rt->mf6c_mcastgrp.sin6_addr) && 1185 (rt->mf6c_stall != NULL)) 1186 break; 1187 } 1188 1189 if (rt == NULL) { 1190 struct mrt6msg *im; 1191 #ifdef MRT6_OINIT 1192 struct omrt6msg *oim; 1193 #endif 1194 1195 /* no upcall, so make a new entry */ 1196 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1197 M_NOWAIT); 1198 if (rt == NULL) { 1199 free(rte, M_MRTABLE6); 1200 m_freem(mb0); 1201 MFC6_UNLOCK(); 1202 return (ENOBUFS); 1203 } 1204 /* 1205 * Make a copy of the header to send to the user 1206 * level process 1207 */ 1208 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1209 1210 if (mm == NULL) { 1211 free(rte, M_MRTABLE6); 1212 m_freem(mb0); 1213 free(rt, M_MRTABLE6); 1214 MFC6_UNLOCK(); 1215 return (ENOBUFS); 1216 } 1217 1218 /* 1219 * Send message to routing daemon 1220 */ 1221 sin6.sin6_addr = ip6->ip6_src; 1222 1223 im = NULL; 1224 #ifdef MRT6_OINIT 1225 oim = NULL; 1226 #endif 1227 switch (V_ip6_mrouter_ver) { 1228 #ifdef MRT6_OINIT 1229 case MRT6_OINIT: 1230 oim = mtod(mm, struct omrt6msg *); 1231 oim->im6_msgtype = MRT6MSG_NOCACHE; 1232 oim->im6_mbz = 0; 1233 break; 1234 #endif 1235 case MRT6_INIT: 1236 im = mtod(mm, struct mrt6msg *); 1237 im->im6_msgtype = MRT6MSG_NOCACHE; 1238 im->im6_mbz = 0; 1239 break; 1240 default: 1241 free(rte, M_MRTABLE6); 1242 m_freem(mb0); 1243 free(rt, M_MRTABLE6); 1244 MFC6_UNLOCK(); 1245 return (EINVAL); 1246 } 1247 1248 #ifdef MRT6DEBUG 1249 if (V_mrt6debug & DEBUG_FORWARD) 1250 log(LOG_DEBUG, 1251 "getting the iif info in the kernel\n"); 1252 #endif 1253 1254 for (mifp = mif6table, mifi = 0; 1255 mifi < nummifs && mifp->m6_ifp != ifp; 1256 mifp++, mifi++) 1257 ; 1258 1259 switch (V_ip6_mrouter_ver) { 1260 #ifdef MRT6_OINIT 1261 case MRT6_OINIT: 1262 oim->im6_mif = mifi; 1263 break; 1264 #endif 1265 case MRT6_INIT: 1266 im->im6_mif = mifi; 1267 break; 1268 } 1269 1270 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1271 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1272 "socket queue full\n"); 1273 mrt6stat.mrt6s_upq_sockfull++; 1274 free(rte, M_MRTABLE6); 1275 m_freem(mb0); 1276 free(rt, M_MRTABLE6); 1277 MFC6_UNLOCK(); 1278 return (ENOBUFS); 1279 } 1280 1281 mrt6stat.mrt6s_upcalls++; 1282 1283 /* insert new entry at head of hash chain */ 1284 bzero(rt, sizeof(*rt)); 1285 rt->mf6c_origin.sin6_family = AF_INET6; 1286 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1287 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1288 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1289 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1290 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1291 rt->mf6c_expire = UPCALL_EXPIRE; 1292 n6expire[hash]++; 1293 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1294 1295 /* link into table */ 1296 rt->mf6c_next = mf6ctable[hash]; 1297 mf6ctable[hash] = rt; 1298 /* Add this entry to the end of the queue */ 1299 rt->mf6c_stall = rte; 1300 } else { 1301 /* determine if q has overflowed */ 1302 struct rtdetq **p; 1303 int npkts = 0; 1304 1305 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1306 if (++npkts > MAX_UPQ6) { 1307 mrt6stat.mrt6s_upq_ovflw++; 1308 free(rte, M_MRTABLE6); 1309 m_freem(mb0); 1310 MFC6_UNLOCK(); 1311 return (0); 1312 } 1313 1314 /* Add this entry to the end of the queue */ 1315 *p = rte; 1316 } 1317 1318 rte->next = NULL; 1319 rte->m = mb0; 1320 rte->ifp = ifp; 1321 #ifdef UPCALL_TIMING 1322 rte->t = tp; 1323 #endif /* UPCALL_TIMING */ 1324 1325 MFC6_UNLOCK(); 1326 1327 return (0); 1328 } 1329 } 1330 1331 /* 1332 * Clean up cache entries if upcalls are not serviced 1333 * Call from the Slow Timeout mechanism, every half second. 1334 */ 1335 static void 1336 expire_upcalls(void *unused) 1337 { 1338 struct rtdetq *rte; 1339 struct mf6c *mfc, **nptr; 1340 int i; 1341 1342 MFC6_LOCK(); 1343 for (i = 0; i < MF6CTBLSIZ; i++) { 1344 if (n6expire[i] == 0) 1345 continue; 1346 nptr = &mf6ctable[i]; 1347 while ((mfc = *nptr) != NULL) { 1348 rte = mfc->mf6c_stall; 1349 /* 1350 * Skip real cache entries 1351 * Make sure it wasn't marked to not expire (shouldn't happen) 1352 * If it expires now 1353 */ 1354 if (rte != NULL && 1355 mfc->mf6c_expire != 0 && 1356 --mfc->mf6c_expire == 0) { 1357 #ifdef MRT6DEBUG 1358 if (V_mrt6debug & DEBUG_EXPIRE) { 1359 char ip6bufo[INET6_ADDRSTRLEN]; 1360 char ip6bufg[INET6_ADDRSTRLEN]; 1361 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1362 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1363 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1364 } 1365 #endif 1366 /* 1367 * drop all the packets 1368 * free the mbuf with the pkt, if, timing info 1369 */ 1370 do { 1371 struct rtdetq *n = rte->next; 1372 m_freem(rte->m); 1373 free(rte, M_MRTABLE6); 1374 rte = n; 1375 } while (rte != NULL); 1376 mrt6stat.mrt6s_cache_cleanups++; 1377 n6expire[i]--; 1378 1379 *nptr = mfc->mf6c_next; 1380 free(mfc, M_MRTABLE6); 1381 } else { 1382 nptr = &mfc->mf6c_next; 1383 } 1384 } 1385 } 1386 MFC6_UNLOCK(); 1387 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1388 expire_upcalls, NULL); 1389 } 1390 1391 /* 1392 * Packet forwarding routine once entry in the cache is made 1393 */ 1394 static int 1395 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1396 { 1397 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1398 mifi_t mifi, iif; 1399 struct mif6 *mifp; 1400 int plen = m->m_pkthdr.len; 1401 struct in6_addr src0, dst0; /* copies for local work */ 1402 u_int32_t iszone, idzone, oszone, odzone; 1403 int error = 0; 1404 1405 /* 1406 * Macro to send packet on mif. Since RSVP packets don't get counted on 1407 * input, they shouldn't get counted on output, so statistics keeping is 1408 * separate. 1409 */ 1410 1411 #define MC6_SEND(ip6, mifp, m) do { \ 1412 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1413 register_send((ip6), (mifp), (m)); \ 1414 else \ 1415 phyint_send((ip6), (mifp), (m)); \ 1416 } while (/*CONSTCOND*/ 0) 1417 1418 /* 1419 * Don't forward if it didn't arrive from the parent mif 1420 * for its origin. 1421 */ 1422 mifi = rt->mf6c_parent; 1423 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1424 /* came in the wrong interface */ 1425 #ifdef MRT6DEBUG 1426 if (V_mrt6debug & DEBUG_FORWARD) 1427 log(LOG_DEBUG, 1428 "wrong if: ifid %d mifi %d mififid %x\n", 1429 ifp->if_index, mifi, 1430 mif6table[mifi].m6_ifp->if_index); 1431 #endif 1432 mrt6stat.mrt6s_wrong_if++; 1433 rt->mf6c_wrong_if++; 1434 /* 1435 * If we are doing PIM processing, and we are forwarding 1436 * packets on this interface, send a message to the 1437 * routing daemon. 1438 */ 1439 /* have to make sure this is a valid mif */ 1440 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1441 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1442 /* 1443 * Check the M_LOOP flag to avoid an 1444 * unnecessary PIM assert. 1445 * XXX: M_LOOP is an ad-hoc hack... 1446 */ 1447 static struct sockaddr_in6 sin6 = 1448 { sizeof(sin6), AF_INET6 }; 1449 1450 struct mbuf *mm; 1451 struct mrt6msg *im; 1452 #ifdef MRT6_OINIT 1453 struct omrt6msg *oim; 1454 #endif 1455 1456 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1457 if (mm && 1458 (M_HASCL(mm) || 1459 mm->m_len < sizeof(struct ip6_hdr))) 1460 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1461 if (mm == NULL) 1462 return (ENOBUFS); 1463 1464 #ifdef MRT6_OINIT 1465 oim = NULL; 1466 #endif 1467 im = NULL; 1468 switch (V_ip6_mrouter_ver) { 1469 #ifdef MRT6_OINIT 1470 case MRT6_OINIT: 1471 oim = mtod(mm, struct omrt6msg *); 1472 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1473 oim->im6_mbz = 0; 1474 break; 1475 #endif 1476 case MRT6_INIT: 1477 im = mtod(mm, struct mrt6msg *); 1478 im->im6_msgtype = MRT6MSG_WRONGMIF; 1479 im->im6_mbz = 0; 1480 break; 1481 default: 1482 m_freem(mm); 1483 return (EINVAL); 1484 } 1485 1486 for (mifp = mif6table, iif = 0; 1487 iif < nummifs && mifp && 1488 mifp->m6_ifp != ifp; 1489 mifp++, iif++) 1490 ; 1491 1492 switch (V_ip6_mrouter_ver) { 1493 #ifdef MRT6_OINIT 1494 case MRT6_OINIT: 1495 oim->im6_mif = iif; 1496 sin6.sin6_addr = oim->im6_src; 1497 break; 1498 #endif 1499 case MRT6_INIT: 1500 im->im6_mif = iif; 1501 sin6.sin6_addr = im->im6_src; 1502 break; 1503 } 1504 1505 mrt6stat.mrt6s_upcalls++; 1506 1507 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1508 #ifdef MRT6DEBUG 1509 if (V_mrt6debug) 1510 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1511 #endif 1512 ++mrt6stat.mrt6s_upq_sockfull; 1513 return (ENOBUFS); 1514 } /* if socket Q full */ 1515 } /* if PIM */ 1516 return (0); 1517 } /* if wrong iif */ 1518 1519 /* If I sourced this packet, it counts as output, else it was input. */ 1520 if (m->m_pkthdr.rcvif == NULL) { 1521 /* XXX: is rcvif really NULL when output?? */ 1522 mif6table[mifi].m6_pkt_out++; 1523 mif6table[mifi].m6_bytes_out += plen; 1524 } else { 1525 mif6table[mifi].m6_pkt_in++; 1526 mif6table[mifi].m6_bytes_in += plen; 1527 } 1528 rt->mf6c_pkt_cnt++; 1529 rt->mf6c_byte_cnt += plen; 1530 1531 /* 1532 * For each mif, forward a copy of the packet if there are group 1533 * members downstream on the interface. 1534 */ 1535 src0 = ip6->ip6_src; 1536 dst0 = ip6->ip6_dst; 1537 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1538 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1539 V_ip6stat.ip6s_badscope++; 1540 return (error); 1541 } 1542 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1543 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1544 /* 1545 * check if the outgoing packet is going to break 1546 * a scope boundary. 1547 * XXX For packets through PIM register tunnel 1548 * interface, we believe a routing daemon. 1549 */ 1550 if (!(mif6table[rt->mf6c_parent].m6_flags & 1551 MIFF_REGISTER) && 1552 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1553 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1554 &oszone) || 1555 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1556 &odzone) || 1557 iszone != oszone || 1558 idzone != odzone) { 1559 V_ip6stat.ip6s_badscope++; 1560 continue; 1561 } 1562 } 1563 1564 mifp->m6_pkt_out++; 1565 mifp->m6_bytes_out += plen; 1566 MC6_SEND(ip6, mifp, m); 1567 } 1568 } 1569 return (0); 1570 } 1571 1572 static void 1573 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1574 { 1575 struct mbuf *mb_copy; 1576 struct ifnet *ifp = mifp->m6_ifp; 1577 int error = 0; 1578 struct sockaddr_in6 *dst6; 1579 u_long linkmtu; 1580 1581 dst6 = &mifp->m6_route.ro_dst; 1582 1583 /* 1584 * Make a new reference to the packet; make sure that 1585 * the IPv6 header is actually copied, not just referenced, 1586 * so that ip6_output() only scribbles on the copy. 1587 */ 1588 mb_copy = m_copy(m, 0, M_COPYALL); 1589 if (mb_copy && 1590 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1591 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1592 if (mb_copy == NULL) { 1593 return; 1594 } 1595 /* set MCAST flag to the outgoing packet */ 1596 mb_copy->m_flags |= M_MCAST; 1597 1598 /* 1599 * If we sourced the packet, call ip6_output since we may devide 1600 * the packet into fragments when the packet is too big for the 1601 * outgoing interface. 1602 * Otherwise, we can simply send the packet to the interface 1603 * sending queue. 1604 */ 1605 if (m->m_pkthdr.rcvif == NULL) { 1606 struct ip6_moptions im6o; 1607 1608 im6o.im6o_multicast_ifp = ifp; 1609 /* XXX: ip6_output will override ip6->ip6_hlim */ 1610 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1611 im6o.im6o_multicast_loop = 1; 1612 error = ip6_output(mb_copy, NULL, &mifp->m6_route, 1613 IPV6_FORWARDING, &im6o, NULL, NULL); 1614 1615 #ifdef MRT6DEBUG 1616 if (V_mrt6debug & DEBUG_XMIT) 1617 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1618 mifp - mif6table, error); 1619 #endif 1620 return; 1621 } 1622 1623 /* 1624 * If configured to loop back multicasts by default, 1625 * loop back a copy now. 1626 */ 1627 if (in6_mcast_loop) { 1628 dst6->sin6_len = sizeof(struct sockaddr_in6); 1629 dst6->sin6_family = AF_INET6; 1630 dst6->sin6_addr = ip6->ip6_dst; 1631 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst); 1632 } 1633 1634 /* 1635 * Put the packet into the sending queue of the outgoing interface 1636 * if it would fit in the MTU of the interface. 1637 */ 1638 linkmtu = IN6_LINKMTU(ifp); 1639 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1640 dst6->sin6_len = sizeof(struct sockaddr_in6); 1641 dst6->sin6_family = AF_INET6; 1642 dst6->sin6_addr = ip6->ip6_dst; 1643 /* 1644 * We just call if_output instead of nd6_output here, since 1645 * we need no ND for a multicast forwarded packet...right? 1646 */ 1647 error = (*ifp->if_output)(ifp, mb_copy, 1648 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL); 1649 #ifdef MRT6DEBUG 1650 if (V_mrt6debug & DEBUG_XMIT) 1651 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1652 mifp - mif6table, error); 1653 #endif 1654 } else { 1655 /* 1656 * pMTU discovery is intentionally disabled by default, since 1657 * various router may notify pMTU in multicast, which can be 1658 * a DDoS to a router 1659 */ 1660 if (V_ip6_mcast_pmtu) 1661 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1662 else { 1663 #ifdef MRT6DEBUG 1664 if (V_mrt6debug & DEBUG_XMIT) { 1665 char ip6bufs[INET6_ADDRSTRLEN]; 1666 char ip6bufd[INET6_ADDRSTRLEN]; 1667 log(LOG_DEBUG, 1668 "phyint_send: packet too big on %s o %s " 1669 "g %s size %d(discarded)\n", 1670 if_name(ifp), 1671 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1672 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1673 mb_copy->m_pkthdr.len); 1674 } 1675 #endif /* MRT6DEBUG */ 1676 m_freem(mb_copy); /* simply discard the packet */ 1677 } 1678 } 1679 } 1680 1681 static int 1682 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1683 { 1684 struct mbuf *mm; 1685 int i, len = m->m_pkthdr.len; 1686 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1687 struct mrt6msg *im6; 1688 1689 #ifdef MRT6DEBUG 1690 if (V_mrt6debug) { 1691 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1692 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1693 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1694 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1695 } 1696 #endif 1697 ++pim6stat.pim6s_snd_registers; 1698 1699 /* Make a copy of the packet to send to the user level process */ 1700 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1701 if (mm == NULL) 1702 return (ENOBUFS); 1703 mm->m_pkthdr.rcvif = NULL; 1704 mm->m_data += max_linkhdr; 1705 mm->m_len = sizeof(struct ip6_hdr); 1706 1707 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1708 m_freem(mm); 1709 return (ENOBUFS); 1710 } 1711 i = MHLEN - M_LEADINGSPACE(mm); 1712 if (i > len) 1713 i = len; 1714 mm = m_pullup(mm, i); 1715 if (mm == NULL) 1716 return (ENOBUFS); 1717 /* TODO: check it! */ 1718 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1719 1720 /* 1721 * Send message to routing daemon 1722 */ 1723 sin6.sin6_addr = ip6->ip6_src; 1724 1725 im6 = mtod(mm, struct mrt6msg *); 1726 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1727 im6->im6_mbz = 0; 1728 1729 im6->im6_mif = mif - mif6table; 1730 1731 /* iif info is not given for reg. encap.n */ 1732 mrt6stat.mrt6s_upcalls++; 1733 1734 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1735 #ifdef MRT6DEBUG 1736 if (V_mrt6debug) 1737 log(LOG_WARNING, 1738 "register_send: ip6_mrouter socket queue full\n"); 1739 #endif 1740 ++mrt6stat.mrt6s_upq_sockfull; 1741 return (ENOBUFS); 1742 } 1743 return (0); 1744 } 1745 1746 /* 1747 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1748 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1749 * into the kernel. 1750 */ 1751 static int 1752 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1753 { 1754 1755 #ifdef DIAGNOSTIC 1756 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1757 #endif 1758 if (proto != IPPROTO_PIM) 1759 return 0; /* not for us; reject the datagram. */ 1760 1761 return 64; /* claim the datagram. */ 1762 } 1763 1764 /* 1765 * PIM sparse mode hook 1766 * Receives the pim control messages, and passes them up to the listening 1767 * socket, using rip6_input. 1768 * The only message processed is the REGISTER pim message; the pim header 1769 * is stripped off, and the inner packet is passed to register_mforward. 1770 */ 1771 int 1772 pim6_input(struct mbuf **mp, int *offp, int proto) 1773 { 1774 struct pim *pim; /* pointer to a pim struct */ 1775 struct ip6_hdr *ip6; 1776 int pimlen; 1777 struct mbuf *m = *mp; 1778 int minlen; 1779 int off = *offp; 1780 1781 ++pim6stat.pim6s_rcv_total; 1782 1783 ip6 = mtod(m, struct ip6_hdr *); 1784 pimlen = m->m_pkthdr.len - *offp; 1785 1786 /* 1787 * Validate lengths 1788 */ 1789 if (pimlen < PIM_MINLEN) { 1790 ++pim6stat.pim6s_rcv_tooshort; 1791 #ifdef MRT6DEBUG 1792 if (V_mrt6debug & DEBUG_PIM) 1793 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1794 #endif 1795 m_freem(m); 1796 return (IPPROTO_DONE); 1797 } 1798 1799 /* 1800 * if the packet is at least as big as a REGISTER, go ahead 1801 * and grab the PIM REGISTER header size, to avoid another 1802 * possible m_pullup() later. 1803 * 1804 * PIM_MINLEN == pimhdr + u_int32 == 8 1805 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1806 */ 1807 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1808 1809 /* 1810 * Make sure that the IP6 and PIM headers in contiguous memory, and 1811 * possibly the PIM REGISTER header 1812 */ 1813 #ifndef PULLDOWN_TEST 1814 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1815 /* adjust pointer */ 1816 ip6 = mtod(m, struct ip6_hdr *); 1817 1818 /* adjust mbuf to point to the PIM header */ 1819 pim = (struct pim *)((caddr_t)ip6 + off); 1820 #else 1821 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1822 if (pim == NULL) { 1823 pim6stat.pim6s_rcv_tooshort++; 1824 return (IPPROTO_DONE); 1825 } 1826 #endif 1827 1828 #define PIM6_CHECKSUM 1829 #ifdef PIM6_CHECKSUM 1830 { 1831 int cksumlen; 1832 1833 /* 1834 * Validate checksum. 1835 * If PIM REGISTER, exclude the data packet 1836 */ 1837 if (pim->pim_type == PIM_REGISTER) 1838 cksumlen = PIM_MINLEN; 1839 else 1840 cksumlen = pimlen; 1841 1842 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1843 ++pim6stat.pim6s_rcv_badsum; 1844 #ifdef MRT6DEBUG 1845 if (V_mrt6debug & DEBUG_PIM) 1846 log(LOG_DEBUG, 1847 "pim6_input: invalid checksum\n"); 1848 #endif 1849 m_freem(m); 1850 return (IPPROTO_DONE); 1851 } 1852 } 1853 #endif /* PIM_CHECKSUM */ 1854 1855 /* PIM version check */ 1856 if (pim->pim_ver != PIM_VERSION) { 1857 ++pim6stat.pim6s_rcv_badversion; 1858 #ifdef MRT6DEBUG 1859 log(LOG_ERR, 1860 "pim6_input: incorrect version %d, expecting %d\n", 1861 pim->pim_ver, PIM_VERSION); 1862 #endif 1863 m_freem(m); 1864 return (IPPROTO_DONE); 1865 } 1866 1867 if (pim->pim_type == PIM_REGISTER) { 1868 /* 1869 * since this is a REGISTER, we'll make a copy of the register 1870 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1871 * routing daemon. 1872 */ 1873 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1874 1875 struct mbuf *mcp; 1876 struct ip6_hdr *eip6; 1877 u_int32_t *reghdr; 1878 int rc; 1879 #ifdef MRT6DEBUG 1880 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1881 #endif 1882 1883 ++pim6stat.pim6s_rcv_registers; 1884 1885 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1886 #ifdef MRT6DEBUG 1887 if (V_mrt6debug & DEBUG_PIM) 1888 log(LOG_DEBUG, 1889 "pim6_input: register mif not set: %d\n", 1890 reg_mif_num); 1891 #endif 1892 m_freem(m); 1893 return (IPPROTO_DONE); 1894 } 1895 1896 reghdr = (u_int32_t *)(pim + 1); 1897 1898 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1899 goto pim6_input_to_daemon; 1900 1901 /* 1902 * Validate length 1903 */ 1904 if (pimlen < PIM6_REG_MINLEN) { 1905 ++pim6stat.pim6s_rcv_tooshort; 1906 ++pim6stat.pim6s_rcv_badregisters; 1907 #ifdef MRT6DEBUG 1908 log(LOG_ERR, 1909 "pim6_input: register packet size too " 1910 "small %d from %s\n", 1911 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1912 #endif 1913 m_freem(m); 1914 return (IPPROTO_DONE); 1915 } 1916 1917 eip6 = (struct ip6_hdr *) (reghdr + 1); 1918 #ifdef MRT6DEBUG 1919 if (V_mrt6debug & DEBUG_PIM) 1920 log(LOG_DEBUG, 1921 "pim6_input[register], eip6: %s -> %s, " 1922 "eip6 plen %d\n", 1923 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1924 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1925 ntohs(eip6->ip6_plen)); 1926 #endif 1927 1928 /* verify the version number of the inner packet */ 1929 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1930 ++pim6stat.pim6s_rcv_badregisters; 1931 #ifdef MRT6DEBUG 1932 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1933 "of the inner packet\n", 1934 (eip6->ip6_vfc & IPV6_VERSION)); 1935 #endif 1936 m_freem(m); 1937 return (IPPROTO_NONE); 1938 } 1939 1940 /* verify the inner packet is destined to a mcast group */ 1941 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1942 ++pim6stat.pim6s_rcv_badregisters; 1943 #ifdef MRT6DEBUG 1944 if (V_mrt6debug & DEBUG_PIM) 1945 log(LOG_DEBUG, 1946 "pim6_input: inner packet of register " 1947 "is not multicast %s\n", 1948 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1949 #endif 1950 m_freem(m); 1951 return (IPPROTO_DONE); 1952 } 1953 1954 /* 1955 * make a copy of the whole header to pass to the daemon later. 1956 */ 1957 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1958 if (mcp == NULL) { 1959 #ifdef MRT6DEBUG 1960 log(LOG_ERR, 1961 "pim6_input: pim register: " 1962 "could not copy register head\n"); 1963 #endif 1964 m_freem(m); 1965 return (IPPROTO_DONE); 1966 } 1967 1968 /* 1969 * forward the inner ip6 packet; point m_data at the inner ip6. 1970 */ 1971 m_adj(m, off + PIM_MINLEN); 1972 #ifdef MRT6DEBUG 1973 if (V_mrt6debug & DEBUG_PIM) { 1974 log(LOG_DEBUG, 1975 "pim6_input: forwarding decapsulated register: " 1976 "src %s, dst %s, mif %d\n", 1977 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1978 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1979 reg_mif_num); 1980 } 1981 #endif 1982 1983 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1984 dst.sin6_family, 0); 1985 1986 /* prepare the register head to send to the mrouting daemon */ 1987 m = mcp; 1988 } 1989 1990 /* 1991 * Pass the PIM message up to the daemon; if it is a register message 1992 * pass the 'head' only up to the daemon. This includes the 1993 * encapsulator ip6 header, pim header, register header and the 1994 * encapsulated ip6 header. 1995 */ 1996 pim6_input_to_daemon: 1997 rip6_input(&m, offp, proto); 1998 return (IPPROTO_DONE); 1999 } 2000 2001 static int 2002 ip6_mroute_modevent(module_t mod, int type, void *unused) 2003 { 2004 2005 switch (type) { 2006 case MOD_LOAD: 2007 MROUTER6_LOCK_INIT(); 2008 MFC6_LOCK_INIT(); 2009 MIF6_LOCK_INIT(); 2010 2011 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 2012 pim6_encapcheck, 2013 (const struct protosw *)&in6_pim_protosw, NULL); 2014 if (pim6_encap_cookie == NULL) { 2015 printf("ip6_mroute: unable to attach pim6 encap\n"); 2016 MIF6_LOCK_DESTROY(); 2017 MFC6_LOCK_DESTROY(); 2018 MROUTER6_LOCK_DESTROY(); 2019 return (EINVAL); 2020 } 2021 2022 ip6_mforward = X_ip6_mforward; 2023 ip6_mrouter_done = X_ip6_mrouter_done; 2024 ip6_mrouter_get = X_ip6_mrouter_get; 2025 ip6_mrouter_set = X_ip6_mrouter_set; 2026 mrt6_ioctl = X_mrt6_ioctl; 2027 break; 2028 2029 case MOD_UNLOAD: 2030 if (V_ip6_mrouter != NULL) 2031 return EINVAL; 2032 2033 if (pim6_encap_cookie) { 2034 encap_detach(pim6_encap_cookie); 2035 pim6_encap_cookie = NULL; 2036 } 2037 X_ip6_mrouter_done(); 2038 ip6_mforward = NULL; 2039 ip6_mrouter_done = NULL; 2040 ip6_mrouter_get = NULL; 2041 ip6_mrouter_set = NULL; 2042 mrt6_ioctl = NULL; 2043 2044 MIF6_LOCK_DESTROY(); 2045 MFC6_LOCK_DESTROY(); 2046 MROUTER6_LOCK_DESTROY(); 2047 break; 2048 2049 default: 2050 return (EOPNOTSUPP); 2051 } 2052 2053 return (0); 2054 } 2055 2056 static moduledata_t ip6_mroutemod = { 2057 "ip6_mroute", 2058 ip6_mroute_modevent, 2059 0 2060 }; 2061 2062 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 45901bb633ba97e02e04c84bdc9f1c49
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