1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1989 Stephen Deering 36 * Copyright (c) 1992, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * Stephen Deering of Stanford University. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 67 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp 68 */ 69 70 /* 71 * IP multicast forwarding procedures 72 * 73 * Written by David Waitzman, BBN Labs, August 1988. 74 * Modified by Steve Deering, Stanford, February 1989. 75 * Modified by Mark J. Steiglitz, Stanford, May, 1991 76 * Modified by Van Jacobson, LBL, January 1993 77 * Modified by Ajit Thyagarajan, PARC, August 1993 78 * Modified by Bill Fenner, PARC, April 1994 79 * 80 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 81 */ 82 83 #include <sys/cdefs.h> 84 __FBSDID("$FreeBSD$"); 85 86 #include "opt_inet6.h" 87 88 #include <sys/param.h> 89 #include <sys/callout.h> 90 #include <sys/errno.h> 91 #include <sys/kernel.h> 92 #include <sys/lock.h> 93 #include <sys/malloc.h> 94 #include <sys/mbuf.h> 95 #include <sys/module.h> 96 #include <sys/domain.h> 97 #include <sys/protosw.h> 98 #include <sys/sdt.h> 99 #include <sys/signalvar.h> 100 #include <sys/socket.h> 101 #include <sys/socketvar.h> 102 #include <sys/sockio.h> 103 #include <sys/sx.h> 104 #include <sys/sysctl.h> 105 #include <sys/syslog.h> 106 #include <sys/systm.h> 107 #include <sys/time.h> 108 109 #include <net/if.h> 110 #include <net/if_var.h> 111 #include <net/if_types.h> 112 #include <net/vnet.h> 113 114 #include <netinet/in.h> 115 #include <netinet/in_var.h> 116 #include <netinet/icmp6.h> 117 #include <netinet/ip_encap.h> 118 119 #include <netinet/ip6.h> 120 #include <netinet/in_kdtrace.h> 121 #include <netinet6/ip6_var.h> 122 #include <netinet6/scope6_var.h> 123 #include <netinet6/nd6.h> 124 #include <netinet6/ip6_mroute.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 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 int pim6_encapcheck(const struct mbuf *, int, int, void *); 142 static int pim6_input(struct mbuf *, int, int, void *); 143 144 static const struct encap_config ipv6_encap_cfg = { 145 .proto = IPPROTO_PIM, 146 .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN, 147 .exact_match = 8, 148 .check = pim6_encapcheck, 149 .input = pim6_input 150 }; 151 152 153 VNET_DEFINE_STATIC(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 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, 159 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 160 "PIM"); 161 162 static struct mrt6stat mrt6stat; 163 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 164 &mrt6stat, mrt6stat, 165 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 166 167 #define MRT6STAT_INC(name) mrt6stat.name += 1 168 #define NO_RTE_FOUND 0x1 169 #define RTE_FOUND 0x2 170 171 static struct mtx mrouter6_mtx; 172 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 173 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 174 #define MROUTER6_LOCK_ASSERT() do { \ 175 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 176 NET_ASSERT_GIANT(); \ 177 } while (0) 178 #define MROUTER6_LOCK_INIT() \ 179 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 180 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 181 182 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 183 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 184 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 185 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 186 "netinet6/ip6_mroute.h)"); 187 188 static struct mtx mfc6_mtx; 189 #define MFC6_LOCK() mtx_lock(&mfc6_mtx) 190 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 191 #define MFC6_LOCK_ASSERT() do { \ 192 mtx_assert(&mfc6_mtx, MA_OWNED); \ 193 NET_ASSERT_GIANT(); \ 194 } while (0) 195 #define MFC6_LOCK_INIT() \ 196 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 197 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 198 199 static u_char n6expire[MF6CTBLSIZ]; 200 201 static struct mif6 mif6table[MAXMIFS]; 202 static int 203 sysctl_mif6table(SYSCTL_HANDLER_ARGS) 204 { 205 struct mif6_sctl *out; 206 int error; 207 208 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, 209 M_WAITOK | M_ZERO); 210 for (int i = 0; i < MAXMIFS; i++) { 211 out[i].m6_flags = mif6table[i].m6_flags; 212 out[i].m6_rate_limit = mif6table[i].m6_rate_limit; 213 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr; 214 if (mif6table[i].m6_ifp != NULL) 215 out[i].m6_ifp = mif6table[i].m6_ifp->if_index; 216 else 217 out[i].m6_ifp = 0; 218 out[i].m6_pkt_in = mif6table[i].m6_pkt_in; 219 out[i].m6_pkt_out = mif6table[i].m6_pkt_out; 220 out[i].m6_bytes_in = mif6table[i].m6_bytes_in; 221 out[i].m6_bytes_out = mif6table[i].m6_bytes_out; 222 } 223 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS); 224 free(out, M_TEMP); 225 return (error); 226 } 227 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, 228 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 229 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]", 230 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], " 231 "netinet6/ip6_mroute.h)"); 232 233 static struct mtx mif6_mtx; 234 #define MIF6_LOCK() mtx_lock(&mif6_mtx) 235 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 236 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 237 #define MIF6_LOCK_INIT() \ 238 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 239 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 240 241 #ifdef MRT6DEBUG 242 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */ 243 #define V_mrt6debug VNET(mrt6debug) 244 #define DEBUG_MFC 0x02 245 #define DEBUG_FORWARD 0x04 246 #define DEBUG_EXPIRE 0x08 247 #define DEBUG_XMIT 0x10 248 #define DEBUG_REG 0x20 249 #define DEBUG_PIM 0x40 250 #define DEBUG_ERR 0x80 251 #define DEBUG_ANY 0x7f 252 #define MRT6_DLOG(m, fmt, ...) \ 253 if (V_mrt6debug & (m)) \ 254 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 255 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 256 #else 257 #define MRT6_DLOG(m, fmt, ...) 258 #endif 259 260 static void expire_upcalls(void *); 261 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 262 #define UPCALL_EXPIRE 6 /* number of timeouts */ 263 264 /* 265 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 266 */ 267 268 /* 269 * 'Interfaces' associated with decapsulator (so we can tell 270 * packets that went through it from ones that get reflected 271 * by a broken gateway). Different from IPv4 register_if, 272 * these interfaces are linked into the system ifnet list, 273 * because per-interface IPv6 statistics are maintained in 274 * ifp->if_afdata. But it does not have any routes point 275 * to them. I.e., packets can't be sent this way. They 276 * only exist as a placeholder for multicast source 277 * verification. 278 */ 279 static struct ifnet *multicast_register_if6; 280 281 #define ENCAP_HOPS 64 282 283 /* 284 * Private variables. 285 */ 286 static mifi_t nummifs = 0; 287 static mifi_t reg_mif_num = (mifi_t)-1; 288 289 static struct pim6stat pim6stat; 290 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 291 &pim6stat, pim6stat, 292 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 293 294 #define PIM6STAT_INC(name) pim6stat.name += 1 295 VNET_DEFINE_STATIC(int, pim6); 296 #define V_pim6 VNET(pim6) 297 298 /* 299 * Hash function for a source, group entry 300 */ 301 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 302 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 303 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 304 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 305 306 /* 307 * Find a route for a given origin IPv6 address and Multicast group address. 308 */ 309 #define MF6CFIND(o, g, rt) do { \ 310 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 311 rt = NULL; \ 312 while (_rt) { \ 313 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 314 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 315 (_rt->mf6c_stall == NULL)) { \ 316 rt = _rt; \ 317 break; \ 318 } \ 319 _rt = _rt->mf6c_next; \ 320 } \ 321 if (rt == NULL) { \ 322 MRT6STAT_INC(mrt6s_mfc_misses); \ 323 } \ 324 } while (/*CONSTCOND*/ 0) 325 326 /* 327 * Macros to compute elapsed time efficiently 328 * Borrowed from Van Jacobson's scheduling code 329 * XXX: replace with timersub() ? 330 */ 331 #define TV_DELTA(a, b, delta) do { \ 332 int xxs; \ 333 \ 334 delta = (a).tv_usec - (b).tv_usec; \ 335 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 336 switch (xxs) { \ 337 case 2: \ 338 delta += 1000000; \ 339 /* FALLTHROUGH */ \ 340 case 1: \ 341 delta += 1000000; \ 342 break; \ 343 default: \ 344 delta += (1000000 * xxs); \ 345 } \ 346 } \ 347 } while (/*CONSTCOND*/ 0) 348 349 /* XXX: replace with timercmp(a, b, <) ? */ 350 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 351 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 352 353 #ifdef UPCALL_TIMING 354 #define UPCALL_MAX 50 355 static u_long upcall_data[UPCALL_MAX + 1]; 356 static void collate(); 357 #endif /* UPCALL_TIMING */ 358 359 static int ip6_mrouter_init(struct socket *, int, int); 360 static int add_m6fc(struct mf6cctl *); 361 static int add_m6if(struct mif6ctl *); 362 static int del_m6fc(struct mf6cctl *); 363 static int del_m6if(mifi_t *); 364 static int del_m6if_locked(mifi_t *); 365 static int get_mif6_cnt(struct sioc_mif_req6 *); 366 static int get_sg_cnt(struct sioc_sg_req6 *); 367 368 static struct callout expire_upcalls_ch; 369 370 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 371 int X_ip6_mrouter_done(void); 372 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 373 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 374 int X_mrt6_ioctl(u_long, caddr_t); 375 376 /* 377 * Handle MRT setsockopt commands to modify the multicast routing tables. 378 */ 379 int 380 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 381 { 382 int error = 0; 383 int optval; 384 struct mif6ctl mifc; 385 struct mf6cctl mfcc; 386 mifi_t mifi; 387 388 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 389 return (EPERM); 390 391 switch (sopt->sopt_name) { 392 case MRT6_INIT: 393 #ifdef MRT6_OINIT 394 case MRT6_OINIT: 395 #endif 396 error = sooptcopyin(sopt, &optval, sizeof(optval), 397 sizeof(optval)); 398 if (error) 399 break; 400 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 401 break; 402 case MRT6_DONE: 403 error = X_ip6_mrouter_done(); 404 break; 405 case MRT6_ADD_MIF: 406 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 407 if (error) 408 break; 409 error = add_m6if(&mifc); 410 break; 411 case MRT6_ADD_MFC: 412 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 413 if (error) 414 break; 415 error = add_m6fc(&mfcc); 416 break; 417 case MRT6_DEL_MFC: 418 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 419 if (error) 420 break; 421 error = del_m6fc(&mfcc); 422 break; 423 case MRT6_DEL_MIF: 424 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 425 if (error) 426 break; 427 error = del_m6if(&mifi); 428 break; 429 case MRT6_PIM: 430 error = sooptcopyin(sopt, &optval, sizeof(optval), 431 sizeof(optval)); 432 if (error) 433 break; 434 error = set_pim6(&optval); 435 break; 436 default: 437 error = EOPNOTSUPP; 438 break; 439 } 440 441 return (error); 442 } 443 444 /* 445 * Handle MRT getsockopt commands 446 */ 447 int 448 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 449 { 450 int error = 0; 451 452 if (so != V_ip6_mrouter) 453 return (EACCES); 454 455 switch (sopt->sopt_name) { 456 case MRT6_PIM: 457 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 458 break; 459 } 460 return (error); 461 } 462 463 /* 464 * Handle ioctl commands to obtain information from the cache 465 */ 466 int 467 X_mrt6_ioctl(u_long cmd, caddr_t data) 468 { 469 int ret; 470 471 ret = EINVAL; 472 473 switch (cmd) { 474 case SIOCGETSGCNT_IN6: 475 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 476 break; 477 478 case SIOCGETMIFCNT_IN6: 479 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 480 break; 481 482 default: 483 break; 484 } 485 486 return (ret); 487 } 488 489 /* 490 * returns the packet, byte, rpf-failure count for the source group provided 491 */ 492 static int 493 get_sg_cnt(struct sioc_sg_req6 *req) 494 { 495 struct mf6c *rt; 496 int ret; 497 498 ret = 0; 499 500 MFC6_LOCK(); 501 502 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 503 if (rt == NULL) { 504 ret = ESRCH; 505 } else { 506 req->pktcnt = rt->mf6c_pkt_cnt; 507 req->bytecnt = rt->mf6c_byte_cnt; 508 req->wrong_if = rt->mf6c_wrong_if; 509 } 510 511 MFC6_UNLOCK(); 512 513 return (ret); 514 } 515 516 /* 517 * returns the input and output packet and byte counts on the mif provided 518 */ 519 static int 520 get_mif6_cnt(struct sioc_mif_req6 *req) 521 { 522 mifi_t mifi; 523 int ret; 524 525 ret = 0; 526 mifi = req->mifi; 527 528 MIF6_LOCK(); 529 530 if (mifi >= nummifs) { 531 ret = EINVAL; 532 } else { 533 req->icount = mif6table[mifi].m6_pkt_in; 534 req->ocount = mif6table[mifi].m6_pkt_out; 535 req->ibytes = mif6table[mifi].m6_bytes_in; 536 req->obytes = mif6table[mifi].m6_bytes_out; 537 } 538 539 MIF6_UNLOCK(); 540 541 return (ret); 542 } 543 544 static int 545 set_pim6(int *i) 546 { 547 if ((*i != 1) && (*i != 0)) 548 return (EINVAL); 549 550 V_pim6 = *i; 551 552 return (0); 553 } 554 555 /* 556 * Enable multicast routing 557 */ 558 static int 559 ip6_mrouter_init(struct socket *so, int v, int cmd) 560 { 561 562 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 563 so->so_type, so->so_proto->pr_protocol); 564 565 if (so->so_type != SOCK_RAW || 566 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 567 return (EOPNOTSUPP); 568 569 if (v != 1) 570 return (ENOPROTOOPT); 571 572 MROUTER6_LOCK(); 573 574 if (V_ip6_mrouter != NULL) { 575 MROUTER6_UNLOCK(); 576 return (EADDRINUSE); 577 } 578 579 V_ip6_mrouter = so; 580 V_ip6_mrouter_ver = cmd; 581 582 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 583 bzero((caddr_t)n6expire, sizeof(n6expire)); 584 585 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 586 587 callout_init(&expire_upcalls_ch, 0); 588 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 589 expire_upcalls, NULL); 590 591 MROUTER6_UNLOCK(); 592 MRT6_DLOG(DEBUG_ANY, "finished"); 593 594 return (0); 595 } 596 597 /* 598 * Disable IPv6 multicast forwarding. 599 */ 600 int 601 X_ip6_mrouter_done(void) 602 { 603 mifi_t mifi; 604 u_long i; 605 struct mf6c *rt; 606 struct rtdetq *rte; 607 608 MROUTER6_LOCK(); 609 610 if (V_ip6_mrouter == NULL) { 611 MROUTER6_UNLOCK(); 612 return (EINVAL); 613 } 614 615 /* 616 * For each phyint in use, disable promiscuous reception of all IPv6 617 * multicasts. 618 */ 619 for (mifi = 0; mifi < nummifs; mifi++) { 620 if (mif6table[mifi].m6_ifp && 621 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 622 if_allmulti(mif6table[mifi].m6_ifp, 0); 623 } 624 } 625 bzero((caddr_t)mif6table, sizeof(mif6table)); 626 nummifs = 0; 627 628 V_pim6 = 0; /* used to stub out/in pim specific code */ 629 630 callout_stop(&expire_upcalls_ch); 631 632 /* 633 * Free all multicast forwarding cache entries. 634 */ 635 MFC6_LOCK(); 636 for (i = 0; i < MF6CTBLSIZ; i++) { 637 rt = mf6ctable[i]; 638 while (rt) { 639 struct mf6c *frt; 640 641 for (rte = rt->mf6c_stall; rte != NULL; ) { 642 struct rtdetq *n = rte->next; 643 644 m_freem(rte->m); 645 free(rte, M_MRTABLE6); 646 rte = n; 647 } 648 frt = rt; 649 rt = rt->mf6c_next; 650 free(frt, M_MRTABLE6); 651 } 652 } 653 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 654 MFC6_UNLOCK(); 655 656 /* 657 * Reset register interface 658 */ 659 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 660 if_detach(multicast_register_if6); 661 if_free(multicast_register_if6); 662 reg_mif_num = (mifi_t)-1; 663 multicast_register_if6 = NULL; 664 } 665 666 V_ip6_mrouter = NULL; 667 V_ip6_mrouter_ver = 0; 668 669 MROUTER6_UNLOCK(); 670 MRT6_DLOG(DEBUG_ANY, "finished"); 671 672 return (0); 673 } 674 675 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 676 677 /* 678 * Add a mif to the mif table 679 */ 680 static int 681 add_m6if(struct mif6ctl *mifcp) 682 { 683 struct mif6 *mifp; 684 struct ifnet *ifp; 685 int error; 686 687 MIF6_LOCK(); 688 689 if (mifcp->mif6c_mifi >= MAXMIFS) { 690 MIF6_UNLOCK(); 691 return (EINVAL); 692 } 693 mifp = mif6table + mifcp->mif6c_mifi; 694 if (mifp->m6_ifp != NULL) { 695 MIF6_UNLOCK(); 696 return (EADDRINUSE); /* XXX: is it appropriate? */ 697 } 698 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 699 MIF6_UNLOCK(); 700 return (ENXIO); 701 } 702 703 ifp = ifnet_byindex(mifcp->mif6c_pifi); 704 705 if (mifcp->mif6c_flags & MIFF_REGISTER) { 706 if (reg_mif_num == (mifi_t)-1) { 707 ifp = if_alloc(IFT_OTHER); 708 709 if_initname(ifp, "register_mif", 0); 710 ifp->if_flags |= IFF_LOOPBACK; 711 if_attach(ifp); 712 multicast_register_if6 = ifp; 713 reg_mif_num = mifcp->mif6c_mifi; 714 /* 715 * it is impossible to guess the ifindex of the 716 * register interface. So mif6c_pifi is automatically 717 * calculated. 718 */ 719 mifcp->mif6c_pifi = ifp->if_index; 720 } else { 721 ifp = multicast_register_if6; 722 } 723 } else { 724 /* Make sure the interface supports multicast */ 725 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 726 MIF6_UNLOCK(); 727 return (EOPNOTSUPP); 728 } 729 730 error = if_allmulti(ifp, 1); 731 if (error) { 732 MIF6_UNLOCK(); 733 return (error); 734 } 735 } 736 737 mifp->m6_flags = mifcp->mif6c_flags; 738 mifp->m6_ifp = ifp; 739 740 /* initialize per mif pkt counters */ 741 mifp->m6_pkt_in = 0; 742 mifp->m6_pkt_out = 0; 743 mifp->m6_bytes_in = 0; 744 mifp->m6_bytes_out = 0; 745 746 /* Adjust nummifs up if the mifi is higher than nummifs */ 747 if (nummifs <= mifcp->mif6c_mifi) 748 nummifs = mifcp->mif6c_mifi + 1; 749 750 MIF6_UNLOCK(); 751 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 752 if_name(ifp)); 753 754 return (0); 755 } 756 757 /* 758 * Delete a mif from the mif table 759 */ 760 static int 761 del_m6if_locked(mifi_t *mifip) 762 { 763 struct mif6 *mifp = mif6table + *mifip; 764 mifi_t mifi; 765 struct ifnet *ifp; 766 767 MIF6_LOCK_ASSERT(); 768 769 if (*mifip >= nummifs) 770 return (EINVAL); 771 if (mifp->m6_ifp == NULL) 772 return (EINVAL); 773 774 if (!(mifp->m6_flags & MIFF_REGISTER)) { 775 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 776 ifp = mifp->m6_ifp; 777 if_allmulti(ifp, 0); 778 } else { 779 if (reg_mif_num != (mifi_t)-1 && 780 multicast_register_if6 != NULL) { 781 if_detach(multicast_register_if6); 782 if_free(multicast_register_if6); 783 reg_mif_num = (mifi_t)-1; 784 multicast_register_if6 = NULL; 785 } 786 } 787 788 bzero((caddr_t)mifp, sizeof(*mifp)); 789 790 /* Adjust nummifs down */ 791 for (mifi = nummifs; mifi > 0; mifi--) 792 if (mif6table[mifi - 1].m6_ifp) 793 break; 794 nummifs = mifi; 795 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 796 797 return (0); 798 } 799 800 static int 801 del_m6if(mifi_t *mifip) 802 { 803 int cc; 804 805 MIF6_LOCK(); 806 cc = del_m6if_locked(mifip); 807 MIF6_UNLOCK(); 808 809 return (cc); 810 } 811 812 /* 813 * Add an mfc entry 814 */ 815 static int 816 add_m6fc(struct mf6cctl *mfccp) 817 { 818 struct mf6c *rt; 819 u_long hash; 820 struct rtdetq *rte; 821 u_short nstl; 822 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 823 824 MFC6_LOCK(); 825 826 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 827 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 828 829 /* If an entry already exists, just update the fields */ 830 if (rt) { 831 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 832 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 833 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 834 mfccp->mf6cc_parent); 835 836 rt->mf6c_parent = mfccp->mf6cc_parent; 837 rt->mf6c_ifset = mfccp->mf6cc_ifset; 838 839 MFC6_UNLOCK(); 840 return (0); 841 } 842 843 /* 844 * Find the entry for which the upcall was made and update 845 */ 846 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 847 mfccp->mf6cc_mcastgrp.sin6_addr); 848 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 849 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 850 &mfccp->mf6cc_origin.sin6_addr) && 851 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 852 &mfccp->mf6cc_mcastgrp.sin6_addr) && 853 (rt->mf6c_stall != NULL)) { 854 855 if (nstl++) 856 log(LOG_ERR, 857 "add_m6fc: %s o %s g %s p %x dbx %p\n", 858 "multiple kernel entries", 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); 864 865 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 866 ip6_sprintf(ip6bufo, 867 &mfccp->mf6cc_origin.sin6_addr), 868 ip6_sprintf(ip6bufg, 869 &mfccp->mf6cc_mcastgrp.sin6_addr), 870 mfccp->mf6cc_parent, rt->mf6c_stall); 871 872 rt->mf6c_origin = mfccp->mf6cc_origin; 873 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 874 rt->mf6c_parent = mfccp->mf6cc_parent; 875 rt->mf6c_ifset = mfccp->mf6cc_ifset; 876 /* initialize pkt counters per src-grp */ 877 rt->mf6c_pkt_cnt = 0; 878 rt->mf6c_byte_cnt = 0; 879 rt->mf6c_wrong_if = 0; 880 881 rt->mf6c_expire = 0; /* Don't clean this guy up */ 882 n6expire[hash]--; 883 884 /* free packets Qed at the end of this entry */ 885 for (rte = rt->mf6c_stall; rte != NULL; ) { 886 struct rtdetq *n = rte->next; 887 ip6_mdq(rte->m, rte->ifp, rt); 888 m_freem(rte->m); 889 #ifdef UPCALL_TIMING 890 collate(&(rte->t)); 891 #endif /* UPCALL_TIMING */ 892 free(rte, M_MRTABLE6); 893 rte = n; 894 } 895 rt->mf6c_stall = NULL; 896 } 897 } 898 899 /* 900 * It is possible that an entry is being inserted without an upcall 901 */ 902 if (nstl == 0) { 903 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 904 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 905 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 906 mfccp->mf6cc_parent); 907 908 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 909 910 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 911 &mfccp->mf6cc_origin.sin6_addr)&& 912 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 913 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 914 915 rt->mf6c_origin = mfccp->mf6cc_origin; 916 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 917 rt->mf6c_parent = mfccp->mf6cc_parent; 918 rt->mf6c_ifset = mfccp->mf6cc_ifset; 919 /* initialize pkt counters per src-grp */ 920 rt->mf6c_pkt_cnt = 0; 921 rt->mf6c_byte_cnt = 0; 922 rt->mf6c_wrong_if = 0; 923 924 if (rt->mf6c_expire) 925 n6expire[hash]--; 926 rt->mf6c_expire = 0; 927 } 928 } 929 if (rt == NULL) { 930 /* no upcall, so make a new entry */ 931 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 932 M_NOWAIT); 933 if (rt == NULL) { 934 MFC6_UNLOCK(); 935 return (ENOBUFS); 936 } 937 938 /* insert new entry at head of hash chain */ 939 rt->mf6c_origin = mfccp->mf6cc_origin; 940 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 941 rt->mf6c_parent = mfccp->mf6cc_parent; 942 rt->mf6c_ifset = mfccp->mf6cc_ifset; 943 /* initialize pkt counters per src-grp */ 944 rt->mf6c_pkt_cnt = 0; 945 rt->mf6c_byte_cnt = 0; 946 rt->mf6c_wrong_if = 0; 947 rt->mf6c_expire = 0; 948 rt->mf6c_stall = NULL; 949 950 /* link into table */ 951 rt->mf6c_next = mf6ctable[hash]; 952 mf6ctable[hash] = rt; 953 } 954 } 955 956 MFC6_UNLOCK(); 957 return (0); 958 } 959 960 #ifdef UPCALL_TIMING 961 /* 962 * collect delay statistics on the upcalls 963 */ 964 static void 965 collate(struct timeval *t) 966 { 967 u_long d; 968 struct timeval tp; 969 u_long delta; 970 971 GET_TIME(tp); 972 973 if (TV_LT(*t, tp)) 974 { 975 TV_DELTA(tp, *t, delta); 976 977 d = delta >> 10; 978 if (d > UPCALL_MAX) 979 d = UPCALL_MAX; 980 981 ++upcall_data[d]; 982 } 983 } 984 #endif /* UPCALL_TIMING */ 985 986 /* 987 * Delete an mfc entry 988 */ 989 static int 990 del_m6fc(struct mf6cctl *mfccp) 991 { 992 #ifdef MRT6DEBUG 993 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 994 #endif 995 struct sockaddr_in6 origin; 996 struct sockaddr_in6 mcastgrp; 997 struct mf6c *rt; 998 struct mf6c **nptr; 999 u_long hash; 1000 1001 origin = mfccp->mf6cc_origin; 1002 mcastgrp = mfccp->mf6cc_mcastgrp; 1003 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1004 1005 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 1006 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1007 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1008 1009 MFC6_LOCK(); 1010 1011 nptr = &mf6ctable[hash]; 1012 while ((rt = *nptr) != NULL) { 1013 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1014 &rt->mf6c_origin.sin6_addr) && 1015 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1016 &rt->mf6c_mcastgrp.sin6_addr) && 1017 rt->mf6c_stall == NULL) 1018 break; 1019 1020 nptr = &rt->mf6c_next; 1021 } 1022 if (rt == NULL) { 1023 MFC6_UNLOCK(); 1024 return (EADDRNOTAVAIL); 1025 } 1026 1027 *nptr = rt->mf6c_next; 1028 free(rt, M_MRTABLE6); 1029 1030 MFC6_UNLOCK(); 1031 1032 return (0); 1033 } 1034 1035 static int 1036 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1037 { 1038 1039 if (s) { 1040 if (sbappendaddr(&s->so_rcv, 1041 (struct sockaddr *)src, 1042 mm, (struct mbuf *)0) != 0) { 1043 sorwakeup(s); 1044 return (0); 1045 } 1046 } 1047 m_freem(mm); 1048 return (-1); 1049 } 1050 1051 /* 1052 * IPv6 multicast forwarding function. This function assumes that the packet 1053 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1054 * pointed to by "ifp", and the packet is to be relayed to other networks 1055 * that have members of the packet's destination IPv6 multicast group. 1056 * 1057 * The packet is returned unscathed to the caller, unless it is 1058 * erroneous, in which case a non-zero return value tells the caller to 1059 * discard it. 1060 * 1061 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1062 * this function is called in the originating context (i.e., not when 1063 * forwarding a packet from other node). ip6_output(), which is currently the 1064 * only function that calls this function is called in the originating context, 1065 * explicitly ensures this condition. It is caller's responsibility to ensure 1066 * that if this function is called from somewhere else in the originating 1067 * context in the future. 1068 */ 1069 int 1070 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1071 { 1072 struct rtdetq *rte; 1073 struct mbuf *mb0; 1074 struct mf6c *rt; 1075 struct mif6 *mifp; 1076 struct mbuf *mm; 1077 u_long hash; 1078 mifi_t mifi; 1079 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1080 #ifdef UPCALL_TIMING 1081 struct timeval tp; 1082 1083 GET_TIME(tp); 1084 #endif /* UPCALL_TIMING */ 1085 1086 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1087 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1088 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1089 1090 /* 1091 * Don't forward a packet with Hop limit of zero or one, 1092 * or a packet destined to a local-only group. 1093 */ 1094 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1095 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1096 return (0); 1097 ip6->ip6_hlim--; 1098 1099 /* 1100 * Source address check: do not forward packets with unspecified 1101 * source. It was discussed in July 2000, on ipngwg mailing list. 1102 * This is rather more serious than unicast cases, because some 1103 * MLD packets can be sent with the unspecified source address 1104 * (although such packets must normally set 1 to the hop limit field). 1105 */ 1106 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1107 IP6STAT_INC(ip6s_cantforward); 1108 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1109 V_ip6_log_time = time_uptime; 1110 log(LOG_DEBUG, 1111 "cannot forward " 1112 "from %s to %s nxt %d received on %s\n", 1113 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1114 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1115 ip6->ip6_nxt, 1116 if_name(m->m_pkthdr.rcvif)); 1117 } 1118 return (0); 1119 } 1120 1121 MFC6_LOCK(); 1122 1123 /* 1124 * Determine forwarding mifs from the forwarding cache table 1125 */ 1126 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1127 MRT6STAT_INC(mrt6s_mfc_lookups); 1128 1129 /* Entry exists, so forward if necessary */ 1130 if (rt) { 1131 MFC6_UNLOCK(); 1132 return (ip6_mdq(m, ifp, rt)); 1133 } 1134 1135 /* 1136 * If we don't have a route for packet's origin, 1137 * Make a copy of the packet & send message to routing daemon. 1138 */ 1139 MRT6STAT_INC(mrt6s_no_route); 1140 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1141 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1142 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1143 1144 /* 1145 * Allocate mbufs early so that we don't do extra work if we 1146 * are just going to fail anyway. 1147 */ 1148 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1149 if (rte == NULL) { 1150 MFC6_UNLOCK(); 1151 return (ENOBUFS); 1152 } 1153 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1154 /* 1155 * Pullup packet header if needed before storing it, 1156 * as other references may modify it in the meantime. 1157 */ 1158 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1159 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1160 if (mb0 == NULL) { 1161 free(rte, M_MRTABLE6); 1162 MFC6_UNLOCK(); 1163 return (ENOBUFS); 1164 } 1165 1166 /* is there an upcall waiting for this packet? */ 1167 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1168 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1169 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1170 &rt->mf6c_origin.sin6_addr) && 1171 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1172 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1173 break; 1174 } 1175 1176 if (rt == NULL) { 1177 struct mrt6msg *im; 1178 #ifdef MRT6_OINIT 1179 struct omrt6msg *oim; 1180 #endif 1181 /* no upcall, so make a new entry */ 1182 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1183 if (rt == NULL) { 1184 free(rte, M_MRTABLE6); 1185 m_freem(mb0); 1186 MFC6_UNLOCK(); 1187 return (ENOBUFS); 1188 } 1189 /* 1190 * Make a copy of the header to send to the user 1191 * level process 1192 */ 1193 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT); 1194 if (mm == NULL) { 1195 free(rte, M_MRTABLE6); 1196 m_freem(mb0); 1197 free(rt, M_MRTABLE6); 1198 MFC6_UNLOCK(); 1199 return (ENOBUFS); 1200 } 1201 1202 /* 1203 * Send message to routing daemon 1204 */ 1205 sin6.sin6_addr = ip6->ip6_src; 1206 im = NULL; 1207 #ifdef MRT6_OINIT 1208 oim = NULL; 1209 #endif 1210 switch (V_ip6_mrouter_ver) { 1211 #ifdef MRT6_OINIT 1212 case MRT6_OINIT: 1213 oim = mtod(mm, struct omrt6msg *); 1214 oim->im6_msgtype = MRT6MSG_NOCACHE; 1215 oim->im6_mbz = 0; 1216 break; 1217 #endif 1218 case MRT6_INIT: 1219 im = mtod(mm, struct mrt6msg *); 1220 im->im6_msgtype = MRT6MSG_NOCACHE; 1221 im->im6_mbz = 0; 1222 break; 1223 default: 1224 free(rte, M_MRTABLE6); 1225 m_freem(mb0); 1226 free(rt, M_MRTABLE6); 1227 MFC6_UNLOCK(); 1228 return (EINVAL); 1229 } 1230 1231 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1232 for (mifp = mif6table, mifi = 0; 1233 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1234 ; 1235 1236 switch (V_ip6_mrouter_ver) { 1237 #ifdef MRT6_OINIT 1238 case MRT6_OINIT: 1239 oim->im6_mif = mifi; 1240 break; 1241 #endif 1242 case MRT6_INIT: 1243 im->im6_mif = mifi; 1244 break; 1245 } 1246 1247 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1248 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1249 "socket queue full\n"); 1250 MRT6STAT_INC(mrt6s_upq_sockfull); 1251 free(rte, M_MRTABLE6); 1252 m_freem(mb0); 1253 free(rt, M_MRTABLE6); 1254 MFC6_UNLOCK(); 1255 return (ENOBUFS); 1256 } 1257 1258 MRT6STAT_INC(mrt6s_upcalls); 1259 1260 /* insert new entry at head of hash chain */ 1261 bzero(rt, sizeof(*rt)); 1262 rt->mf6c_origin.sin6_family = AF_INET6; 1263 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1264 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1265 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1266 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1267 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1268 rt->mf6c_expire = UPCALL_EXPIRE; 1269 n6expire[hash]++; 1270 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1271 1272 /* link into table */ 1273 rt->mf6c_next = mf6ctable[hash]; 1274 mf6ctable[hash] = rt; 1275 /* Add this entry to the end of the queue */ 1276 rt->mf6c_stall = rte; 1277 } else { 1278 /* determine if q has overflowed */ 1279 struct rtdetq **p; 1280 int npkts = 0; 1281 1282 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1283 if (++npkts > MAX_UPQ6) { 1284 MRT6STAT_INC(mrt6s_upq_ovflw); 1285 free(rte, M_MRTABLE6); 1286 m_freem(mb0); 1287 MFC6_UNLOCK(); 1288 return (0); 1289 } 1290 1291 /* Add this entry to the end of the queue */ 1292 *p = rte; 1293 } 1294 1295 rte->next = NULL; 1296 rte->m = mb0; 1297 rte->ifp = ifp; 1298 #ifdef UPCALL_TIMING 1299 rte->t = tp; 1300 #endif /* UPCALL_TIMING */ 1301 1302 MFC6_UNLOCK(); 1303 1304 return (0); 1305 } 1306 1307 /* 1308 * Clean up cache entries if upcalls are not serviced 1309 * Call from the Slow Timeout mechanism, every half second. 1310 */ 1311 static void 1312 expire_upcalls(void *unused) 1313 { 1314 #ifdef MRT6DEBUG 1315 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1316 #endif 1317 struct rtdetq *rte; 1318 struct mf6c *mfc, **nptr; 1319 u_long i; 1320 1321 MFC6_LOCK(); 1322 for (i = 0; i < MF6CTBLSIZ; i++) { 1323 if (n6expire[i] == 0) 1324 continue; 1325 nptr = &mf6ctable[i]; 1326 while ((mfc = *nptr) != NULL) { 1327 rte = mfc->mf6c_stall; 1328 /* 1329 * Skip real cache entries 1330 * Make sure it wasn't marked to not expire (shouldn't happen) 1331 * If it expires now 1332 */ 1333 if (rte != NULL && 1334 mfc->mf6c_expire != 0 && 1335 --mfc->mf6c_expire == 0) { 1336 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1337 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1338 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1339 /* 1340 * drop all the packets 1341 * free the mbuf with the pkt, if, timing info 1342 */ 1343 do { 1344 struct rtdetq *n = rte->next; 1345 m_freem(rte->m); 1346 free(rte, M_MRTABLE6); 1347 rte = n; 1348 } while (rte != NULL); 1349 MRT6STAT_INC(mrt6s_cache_cleanups); 1350 n6expire[i]--; 1351 1352 *nptr = mfc->mf6c_next; 1353 free(mfc, M_MRTABLE6); 1354 } else { 1355 nptr = &mfc->mf6c_next; 1356 } 1357 } 1358 } 1359 MFC6_UNLOCK(); 1360 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1361 expire_upcalls, NULL); 1362 } 1363 1364 /* 1365 * Packet forwarding routine once entry in the cache is made 1366 */ 1367 static int 1368 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1369 { 1370 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1371 mifi_t mifi, iif; 1372 struct mif6 *mifp; 1373 int plen = m->m_pkthdr.len; 1374 struct in6_addr src0, dst0; /* copies for local work */ 1375 u_int32_t iszone, idzone, oszone, odzone; 1376 int error = 0; 1377 1378 /* 1379 * Don't forward if it didn't arrive from the parent mif 1380 * for its origin. 1381 */ 1382 mifi = rt->mf6c_parent; 1383 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1384 /* came in the wrong interface */ 1385 MRT6_DLOG(DEBUG_FORWARD, 1386 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1387 mifi, mif6table[mifi].m6_ifp->if_index); 1388 MRT6STAT_INC(mrt6s_wrong_if); 1389 rt->mf6c_wrong_if++; 1390 /* 1391 * If we are doing PIM processing, and we are forwarding 1392 * packets on this interface, send a message to the 1393 * routing daemon. 1394 */ 1395 /* have to make sure this is a valid mif */ 1396 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1397 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1398 /* 1399 * Check the M_LOOP flag to avoid an 1400 * unnecessary PIM assert. 1401 * XXX: M_LOOP is an ad-hoc hack... 1402 */ 1403 static struct sockaddr_in6 sin6 = 1404 { sizeof(sin6), AF_INET6 }; 1405 1406 struct mbuf *mm; 1407 struct mrt6msg *im; 1408 #ifdef MRT6_OINIT 1409 struct omrt6msg *oim; 1410 #endif 1411 1412 mm = m_copym(m, 0, sizeof(struct ip6_hdr), 1413 M_NOWAIT); 1414 if (mm && 1415 (!M_WRITABLE(mm) || 1416 mm->m_len < sizeof(struct ip6_hdr))) 1417 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1418 if (mm == NULL) 1419 return (ENOBUFS); 1420 1421 #ifdef MRT6_OINIT 1422 oim = NULL; 1423 #endif 1424 im = NULL; 1425 switch (V_ip6_mrouter_ver) { 1426 #ifdef MRT6_OINIT 1427 case MRT6_OINIT: 1428 oim = mtod(mm, struct omrt6msg *); 1429 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1430 oim->im6_mbz = 0; 1431 break; 1432 #endif 1433 case MRT6_INIT: 1434 im = mtod(mm, struct mrt6msg *); 1435 im->im6_msgtype = MRT6MSG_WRONGMIF; 1436 im->im6_mbz = 0; 1437 break; 1438 default: 1439 m_freem(mm); 1440 return (EINVAL); 1441 } 1442 1443 for (mifp = mif6table, iif = 0; 1444 iif < nummifs && mifp && 1445 mifp->m6_ifp != ifp; 1446 mifp++, iif++) 1447 ; 1448 1449 switch (V_ip6_mrouter_ver) { 1450 #ifdef MRT6_OINIT 1451 case MRT6_OINIT: 1452 oim->im6_mif = iif; 1453 sin6.sin6_addr = oim->im6_src; 1454 break; 1455 #endif 1456 case MRT6_INIT: 1457 im->im6_mif = iif; 1458 sin6.sin6_addr = im->im6_src; 1459 break; 1460 } 1461 1462 MRT6STAT_INC(mrt6s_upcalls); 1463 1464 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1465 MRT6_DLOG(DEBUG_ANY, 1466 "ip6_mrouter socket queue full"); 1467 MRT6STAT_INC(mrt6s_upq_sockfull); 1468 return (ENOBUFS); 1469 } /* if socket Q full */ 1470 } /* if PIM */ 1471 return (0); 1472 } /* if wrong iif */ 1473 1474 /* If I sourced this packet, it counts as output, else it was input. */ 1475 if (m->m_pkthdr.rcvif == NULL) { 1476 /* XXX: is rcvif really NULL when output?? */ 1477 mif6table[mifi].m6_pkt_out++; 1478 mif6table[mifi].m6_bytes_out += plen; 1479 } else { 1480 mif6table[mifi].m6_pkt_in++; 1481 mif6table[mifi].m6_bytes_in += plen; 1482 } 1483 rt->mf6c_pkt_cnt++; 1484 rt->mf6c_byte_cnt += plen; 1485 1486 /* 1487 * For each mif, forward a copy of the packet if there are group 1488 * members downstream on the interface. 1489 */ 1490 src0 = ip6->ip6_src; 1491 dst0 = ip6->ip6_dst; 1492 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1493 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1494 IP6STAT_INC(ip6s_badscope); 1495 return (error); 1496 } 1497 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1498 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1499 /* 1500 * check if the outgoing packet is going to break 1501 * a scope boundary. 1502 * XXX For packets through PIM register tunnel 1503 * interface, we believe a routing daemon. 1504 */ 1505 if (!(mif6table[rt->mf6c_parent].m6_flags & 1506 MIFF_REGISTER) && 1507 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1508 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1509 &oszone) || 1510 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1511 &odzone) || 1512 iszone != oszone || 1513 idzone != odzone) { 1514 IP6STAT_INC(ip6s_badscope); 1515 continue; 1516 } 1517 } 1518 1519 mifp->m6_pkt_out++; 1520 mifp->m6_bytes_out += plen; 1521 if (mifp->m6_flags & MIFF_REGISTER) 1522 register_send(ip6, mifp, m); 1523 else 1524 phyint_send(ip6, mifp, m); 1525 } 1526 } 1527 return (0); 1528 } 1529 1530 static void 1531 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1532 { 1533 #ifdef MRT6DEBUG 1534 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1535 #endif 1536 struct mbuf *mb_copy; 1537 struct ifnet *ifp = mifp->m6_ifp; 1538 int error = 0; 1539 u_long linkmtu; 1540 1541 /* 1542 * Make a new reference to the packet; make sure that 1543 * the IPv6 header is actually copied, not just referenced, 1544 * so that ip6_output() only scribbles on the copy. 1545 */ 1546 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1547 if (mb_copy && 1548 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1549 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1550 if (mb_copy == NULL) { 1551 return; 1552 } 1553 /* set MCAST flag to the outgoing packet */ 1554 mb_copy->m_flags |= M_MCAST; 1555 1556 /* 1557 * If we sourced the packet, call ip6_output since we may devide 1558 * the packet into fragments when the packet is too big for the 1559 * outgoing interface. 1560 * Otherwise, we can simply send the packet to the interface 1561 * sending queue. 1562 */ 1563 if (m->m_pkthdr.rcvif == NULL) { 1564 struct ip6_moptions im6o; 1565 struct epoch_tracker et; 1566 1567 im6o.im6o_multicast_ifp = ifp; 1568 /* XXX: ip6_output will override ip6->ip6_hlim */ 1569 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1570 im6o.im6o_multicast_loop = 1; 1571 NET_EPOCH_ENTER(et); 1572 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1573 NULL, NULL); 1574 NET_EPOCH_EXIT(et); 1575 1576 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1577 (uint16_t)(mifp - mif6table), error); 1578 return; 1579 } 1580 1581 /* 1582 * If configured to loop back multicasts by default, 1583 * loop back a copy now. 1584 */ 1585 if (in6_mcast_loop) 1586 ip6_mloopback(ifp, m); 1587 1588 /* 1589 * Put the packet into the sending queue of the outgoing interface 1590 * if it would fit in the MTU of the interface. 1591 */ 1592 linkmtu = IN6_LINKMTU(ifp); 1593 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1594 struct sockaddr_in6 dst6; 1595 1596 bzero(&dst6, sizeof(dst6)); 1597 dst6.sin6_len = sizeof(struct sockaddr_in6); 1598 dst6.sin6_family = AF_INET6; 1599 dst6.sin6_addr = ip6->ip6_dst; 1600 1601 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1602 /* 1603 * We just call if_output instead of nd6_output here, since 1604 * we need no ND for a multicast forwarded packet...right? 1605 */ 1606 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1607 error = (*ifp->if_output)(ifp, mb_copy, 1608 (struct sockaddr *)&dst6, NULL); 1609 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1610 (uint16_t)(mifp - mif6table), error); 1611 } else { 1612 /* 1613 * pMTU discovery is intentionally disabled by default, since 1614 * various router may notify pMTU in multicast, which can be 1615 * a DDoS to a router 1616 */ 1617 if (V_ip6_mcast_pmtu) 1618 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1619 else { 1620 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1621 "g %s size %d (discarded)", if_name(ifp), 1622 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1623 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1624 mb_copy->m_pkthdr.len); 1625 m_freem(mb_copy); /* simply discard the packet */ 1626 } 1627 } 1628 } 1629 1630 static int 1631 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1632 { 1633 #ifdef MRT6DEBUG 1634 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1635 #endif 1636 struct mbuf *mm; 1637 int i, len = m->m_pkthdr.len; 1638 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1639 struct mrt6msg *im6; 1640 1641 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1642 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1643 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1644 PIM6STAT_INC(pim6s_snd_registers); 1645 1646 /* Make a copy of the packet to send to the user level process. */ 1647 mm = m_gethdr(M_NOWAIT, MT_DATA); 1648 if (mm == NULL) 1649 return (ENOBUFS); 1650 mm->m_data += max_linkhdr; 1651 mm->m_len = sizeof(struct ip6_hdr); 1652 1653 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 1654 m_freem(mm); 1655 return (ENOBUFS); 1656 } 1657 i = MHLEN - M_LEADINGSPACE(mm); 1658 if (i > len) 1659 i = len; 1660 mm = m_pullup(mm, i); 1661 if (mm == NULL) 1662 return (ENOBUFS); 1663 /* TODO: check it! */ 1664 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1665 1666 /* 1667 * Send message to routing daemon 1668 */ 1669 sin6.sin6_addr = ip6->ip6_src; 1670 1671 im6 = mtod(mm, struct mrt6msg *); 1672 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1673 im6->im6_mbz = 0; 1674 1675 im6->im6_mif = mif - mif6table; 1676 1677 /* iif info is not given for reg. encap.n */ 1678 MRT6STAT_INC(mrt6s_upcalls); 1679 1680 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1681 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1682 MRT6STAT_INC(mrt6s_upq_sockfull); 1683 return (ENOBUFS); 1684 } 1685 return (0); 1686 } 1687 1688 /* 1689 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1690 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1691 * into the kernel. 1692 */ 1693 static int 1694 pim6_encapcheck(const struct mbuf *m __unused, int off __unused, 1695 int proto __unused, void *arg __unused) 1696 { 1697 1698 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1699 return (8); /* claim the datagram. */ 1700 } 1701 1702 /* 1703 * PIM sparse mode hook 1704 * Receives the pim control messages, and passes them up to the listening 1705 * socket, using rip6_input. 1706 * The only message processed is the REGISTER pim message; the pim header 1707 * is stripped off, and the inner packet is passed to register_mforward. 1708 */ 1709 static int 1710 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused) 1711 { 1712 struct pim *pim; /* pointer to a pim struct */ 1713 struct ip6_hdr *ip6; 1714 int pimlen; 1715 int minlen; 1716 1717 PIM6STAT_INC(pim6s_rcv_total); 1718 1719 /* 1720 * Validate lengths 1721 */ 1722 pimlen = m->m_pkthdr.len - off; 1723 if (pimlen < PIM_MINLEN) { 1724 PIM6STAT_INC(pim6s_rcv_tooshort); 1725 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1726 m_freem(m); 1727 return (IPPROTO_DONE); 1728 } 1729 1730 /* 1731 * if the packet is at least as big as a REGISTER, go ahead 1732 * and grab the PIM REGISTER header size, to avoid another 1733 * possible m_pullup() later. 1734 * 1735 * PIM_MINLEN == pimhdr + u_int32 == 8 1736 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1737 */ 1738 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1739 1740 /* 1741 * Make sure that the IP6 and PIM headers in contiguous memory, and 1742 * possibly the PIM REGISTER header 1743 */ 1744 if (m->m_len < off + minlen) { 1745 m = m_pullup(m, off + minlen); 1746 if (m == NULL) { 1747 IP6STAT_INC(ip6s_exthdrtoolong); 1748 return (IPPROTO_DONE); 1749 } 1750 } 1751 ip6 = mtod(m, struct ip6_hdr *); 1752 pim = (struct pim *)((caddr_t)ip6 + off); 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_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT); 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 return (rip6_input(&m, &off, proto)); 1891 } 1892 1893 static int 1894 ip6_mroute_modevent(module_t mod, int type, void *unused) 1895 { 1896 1897 switch (type) { 1898 case MOD_LOAD: 1899 MROUTER6_LOCK_INIT(); 1900 MFC6_LOCK_INIT(); 1901 MIF6_LOCK_INIT(); 1902 1903 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg, 1904 NULL, M_WAITOK); 1905 if (pim6_encap_cookie == NULL) { 1906 printf("ip6_mroute: unable to attach pim6 encap\n"); 1907 MIF6_LOCK_DESTROY(); 1908 MFC6_LOCK_DESTROY(); 1909 MROUTER6_LOCK_DESTROY(); 1910 return (EINVAL); 1911 } 1912 1913 ip6_mforward = X_ip6_mforward; 1914 ip6_mrouter_done = X_ip6_mrouter_done; 1915 ip6_mrouter_get = X_ip6_mrouter_get; 1916 ip6_mrouter_set = X_ip6_mrouter_set; 1917 mrt6_ioctl = X_mrt6_ioctl; 1918 break; 1919 1920 case MOD_UNLOAD: 1921 if (V_ip6_mrouter != NULL) 1922 return EINVAL; 1923 1924 if (pim6_encap_cookie) { 1925 ip6_encap_detach(pim6_encap_cookie); 1926 pim6_encap_cookie = NULL; 1927 } 1928 X_ip6_mrouter_done(); 1929 ip6_mforward = NULL; 1930 ip6_mrouter_done = NULL; 1931 ip6_mrouter_get = NULL; 1932 ip6_mrouter_set = NULL; 1933 mrt6_ioctl = NULL; 1934 1935 MIF6_LOCK_DESTROY(); 1936 MFC6_LOCK_DESTROY(); 1937 MROUTER6_LOCK_DESTROY(); 1938 break; 1939 1940 default: 1941 return (EOPNOTSUPP); 1942 } 1943 1944 return (0); 1945 } 1946 1947 static moduledata_t ip6_mroutemod = { 1948 "ip6_mroute", 1949 ip6_mroute_modevent, 1950 0 1951 }; 1952 1953 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY); 1954