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 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0; 153 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 154 155 SYSCTL_DECL(_net_inet6); 156 SYSCTL_DECL(_net_inet6_ip6); 157 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, 158 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 159 "PIM"); 160 161 static struct mrt6stat mrt6stat; 162 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 163 &mrt6stat, mrt6stat, 164 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 165 166 #define MRT6STAT_INC(name) mrt6stat.name += 1 167 #define NO_RTE_FOUND 0x1 168 #define RTE_FOUND 0x2 169 170 static struct mtx mrouter6_mtx; 171 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 172 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 173 #define MROUTER6_LOCK_ASSERT() do { \ 174 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 175 NET_ASSERT_GIANT(); \ 176 } while (0) 177 #define MROUTER6_LOCK_INIT() \ 178 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 179 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 180 181 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 182 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 183 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 184 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 185 "netinet6/ip6_mroute.h)"); 186 187 static struct mtx mfc6_mtx; 188 #define MFC6_LOCK() mtx_lock(&mfc6_mtx) 189 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 190 #define MFC6_LOCK_ASSERT() do { \ 191 mtx_assert(&mfc6_mtx, MA_OWNED); \ 192 NET_ASSERT_GIANT(); \ 193 } while (0) 194 #define MFC6_LOCK_INIT() \ 195 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 196 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 197 198 static u_char n6expire[MF6CTBLSIZ]; 199 200 static struct mif6 mif6table[MAXMIFS]; 201 static int 202 sysctl_mif6table(SYSCTL_HANDLER_ARGS) 203 { 204 struct mif6_sctl *out; 205 int error; 206 207 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, 208 M_WAITOK | M_ZERO); 209 for (int i = 0; i < MAXMIFS; i++) { 210 out[i].m6_flags = mif6table[i].m6_flags; 211 out[i].m6_rate_limit = mif6table[i].m6_rate_limit; 212 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr; 213 if (mif6table[i].m6_ifp != NULL) 214 out[i].m6_ifp = mif6table[i].m6_ifp->if_index; 215 else 216 out[i].m6_ifp = 0; 217 out[i].m6_pkt_in = mif6table[i].m6_pkt_in; 218 out[i].m6_pkt_out = mif6table[i].m6_pkt_out; 219 out[i].m6_bytes_in = mif6table[i].m6_bytes_in; 220 out[i].m6_bytes_out = mif6table[i].m6_bytes_out; 221 } 222 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS); 223 free(out, M_TEMP); 224 return (error); 225 } 226 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, 227 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 228 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]", 229 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], " 230 "netinet6/ip6_mroute.h)"); 231 232 static struct mtx mif6_mtx; 233 #define MIF6_LOCK() mtx_lock(&mif6_mtx) 234 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 235 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 236 #define MIF6_LOCK_INIT() \ 237 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 238 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 239 240 #ifdef MRT6DEBUG 241 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */ 242 #define V_mrt6debug VNET(mrt6debug) 243 #define DEBUG_MFC 0x02 244 #define DEBUG_FORWARD 0x04 245 #define DEBUG_EXPIRE 0x08 246 #define DEBUG_XMIT 0x10 247 #define DEBUG_REG 0x20 248 #define DEBUG_PIM 0x40 249 #define DEBUG_ERR 0x80 250 #define DEBUG_ANY 0x7f 251 #define MRT6_DLOG(m, fmt, ...) \ 252 if (V_mrt6debug & (m)) \ 253 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 254 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 255 #else 256 #define MRT6_DLOG(m, fmt, ...) 257 #endif 258 259 static void expire_upcalls(void *); 260 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 261 #define UPCALL_EXPIRE 6 /* number of timeouts */ 262 263 /* 264 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 265 */ 266 267 /* 268 * 'Interfaces' associated with decapsulator (so we can tell 269 * packets that went through it from ones that get reflected 270 * by a broken gateway). Different from IPv4 register_if, 271 * these interfaces are linked into the system ifnet list, 272 * because per-interface IPv6 statistics are maintained in 273 * ifp->if_afdata. But it does not have any routes point 274 * to them. I.e., packets can't be sent this way. They 275 * only exist as a placeholder for multicast source 276 * verification. 277 */ 278 static struct ifnet *multicast_register_if6; 279 280 #define ENCAP_HOPS 64 281 282 /* 283 * Private variables. 284 */ 285 static mifi_t nummifs = 0; 286 static mifi_t reg_mif_num = (mifi_t)-1; 287 288 static struct pim6stat pim6stat; 289 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 290 &pim6stat, pim6stat, 291 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 292 293 #define PIM6STAT_INC(name) pim6stat.name += 1 294 VNET_DEFINE_STATIC(int, pim6); 295 #define V_pim6 VNET(pim6) 296 297 /* 298 * Hash function for a source, group entry 299 */ 300 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 301 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 302 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 303 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 304 305 /* 306 * Find a route for a given origin IPv6 address and Multicast group address. 307 */ 308 #define MF6CFIND(o, g, rt) do { \ 309 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 310 rt = NULL; \ 311 while (_rt) { \ 312 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 313 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 314 (_rt->mf6c_stall == NULL)) { \ 315 rt = _rt; \ 316 break; \ 317 } \ 318 _rt = _rt->mf6c_next; \ 319 } \ 320 if (rt == NULL) { \ 321 MRT6STAT_INC(mrt6s_mfc_misses); \ 322 } \ 323 } while (/*CONSTCOND*/ 0) 324 325 /* 326 * Macros to compute elapsed time efficiently 327 * Borrowed from Van Jacobson's scheduling code 328 * XXX: replace with timersub() ? 329 */ 330 #define TV_DELTA(a, b, delta) do { \ 331 int xxs; \ 332 \ 333 delta = (a).tv_usec - (b).tv_usec; \ 334 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 335 switch (xxs) { \ 336 case 2: \ 337 delta += 1000000; \ 338 /* FALLTHROUGH */ \ 339 case 1: \ 340 delta += 1000000; \ 341 break; \ 342 default: \ 343 delta += (1000000 * xxs); \ 344 } \ 345 } \ 346 } while (/*CONSTCOND*/ 0) 347 348 /* XXX: replace with timercmp(a, b, <) ? */ 349 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 350 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 351 352 #ifdef UPCALL_TIMING 353 #define UPCALL_MAX 50 354 static u_long upcall_data[UPCALL_MAX + 1]; 355 static void collate(); 356 #endif /* UPCALL_TIMING */ 357 358 static int ip6_mrouter_init(struct socket *, int, int); 359 static int add_m6fc(struct mf6cctl *); 360 static int add_m6if(struct mif6ctl *); 361 static int del_m6fc(struct mf6cctl *); 362 static int del_m6if(mifi_t *); 363 static int del_m6if_locked(mifi_t *); 364 static int get_mif6_cnt(struct sioc_mif_req6 *); 365 static int get_sg_cnt(struct sioc_sg_req6 *); 366 367 static struct callout expire_upcalls_ch; 368 369 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 370 int X_ip6_mrouter_done(void); 371 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 372 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 373 int X_mrt6_ioctl(u_long, caddr_t); 374 375 /* 376 * Handle MRT setsockopt commands to modify the multicast routing tables. 377 */ 378 int 379 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 380 { 381 int error = 0; 382 int optval; 383 struct mif6ctl mifc; 384 struct mf6cctl mfcc; 385 mifi_t mifi; 386 387 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 388 return (EPERM); 389 390 switch (sopt->sopt_name) { 391 case MRT6_INIT: 392 #ifdef MRT6_OINIT 393 case MRT6_OINIT: 394 #endif 395 error = sooptcopyin(sopt, &optval, sizeof(optval), 396 sizeof(optval)); 397 if (error) 398 break; 399 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 400 break; 401 case MRT6_DONE: 402 error = X_ip6_mrouter_done(); 403 break; 404 case MRT6_ADD_MIF: 405 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 406 if (error) 407 break; 408 error = add_m6if(&mifc); 409 break; 410 case MRT6_ADD_MFC: 411 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 412 if (error) 413 break; 414 error = add_m6fc(&mfcc); 415 break; 416 case MRT6_DEL_MFC: 417 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 418 if (error) 419 break; 420 error = del_m6fc(&mfcc); 421 break; 422 case MRT6_DEL_MIF: 423 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 424 if (error) 425 break; 426 error = del_m6if(&mifi); 427 break; 428 case MRT6_PIM: 429 error = sooptcopyin(sopt, &optval, sizeof(optval), 430 sizeof(optval)); 431 if (error) 432 break; 433 error = set_pim6(&optval); 434 break; 435 default: 436 error = EOPNOTSUPP; 437 break; 438 } 439 440 return (error); 441 } 442 443 /* 444 * Handle MRT getsockopt commands 445 */ 446 int 447 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 448 { 449 int error = 0; 450 451 if (so != V_ip6_mrouter) 452 return (EACCES); 453 454 switch (sopt->sopt_name) { 455 case MRT6_PIM: 456 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 457 break; 458 } 459 return (error); 460 } 461 462 /* 463 * Handle ioctl commands to obtain information from the cache 464 */ 465 int 466 X_mrt6_ioctl(u_long cmd, caddr_t data) 467 { 468 int ret; 469 470 ret = EINVAL; 471 472 switch (cmd) { 473 case SIOCGETSGCNT_IN6: 474 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 475 break; 476 477 case SIOCGETMIFCNT_IN6: 478 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 479 break; 480 481 default: 482 break; 483 } 484 485 return (ret); 486 } 487 488 /* 489 * returns the packet, byte, rpf-failure count for the source group provided 490 */ 491 static int 492 get_sg_cnt(struct sioc_sg_req6 *req) 493 { 494 struct mf6c *rt; 495 int ret; 496 497 ret = 0; 498 499 MFC6_LOCK(); 500 501 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 502 if (rt == NULL) { 503 ret = ESRCH; 504 } else { 505 req->pktcnt = rt->mf6c_pkt_cnt; 506 req->bytecnt = rt->mf6c_byte_cnt; 507 req->wrong_if = rt->mf6c_wrong_if; 508 } 509 510 MFC6_UNLOCK(); 511 512 return (ret); 513 } 514 515 /* 516 * returns the input and output packet and byte counts on the mif provided 517 */ 518 static int 519 get_mif6_cnt(struct sioc_mif_req6 *req) 520 { 521 mifi_t mifi; 522 int ret; 523 524 ret = 0; 525 mifi = req->mifi; 526 527 MIF6_LOCK(); 528 529 if (mifi >= nummifs) { 530 ret = EINVAL; 531 } else { 532 req->icount = mif6table[mifi].m6_pkt_in; 533 req->ocount = mif6table[mifi].m6_pkt_out; 534 req->ibytes = mif6table[mifi].m6_bytes_in; 535 req->obytes = mif6table[mifi].m6_bytes_out; 536 } 537 538 MIF6_UNLOCK(); 539 540 return (ret); 541 } 542 543 static int 544 set_pim6(int *i) 545 { 546 if ((*i != 1) && (*i != 0)) 547 return (EINVAL); 548 549 V_pim6 = *i; 550 551 return (0); 552 } 553 554 /* 555 * Enable multicast routing 556 */ 557 static int 558 ip6_mrouter_init(struct socket *so, int v, int cmd) 559 { 560 561 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 562 so->so_type, so->so_proto->pr_protocol); 563 564 if (so->so_type != SOCK_RAW || 565 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 566 return (EOPNOTSUPP); 567 568 if (v != 1) 569 return (ENOPROTOOPT); 570 571 MROUTER6_LOCK(); 572 573 if (V_ip6_mrouter != NULL) { 574 MROUTER6_UNLOCK(); 575 return (EADDRINUSE); 576 } 577 578 V_ip6_mrouter = so; 579 V_ip6_mrouter_ver = cmd; 580 581 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 582 bzero((caddr_t)n6expire, sizeof(n6expire)); 583 584 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 585 586 callout_init(&expire_upcalls_ch, 0); 587 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 588 expire_upcalls, NULL); 589 590 MROUTER6_UNLOCK(); 591 MRT6_DLOG(DEBUG_ANY, "finished"); 592 593 return (0); 594 } 595 596 /* 597 * Disable IPv6 multicast forwarding. 598 */ 599 int 600 X_ip6_mrouter_done(void) 601 { 602 mifi_t mifi; 603 u_long i; 604 struct mf6c *rt; 605 struct rtdetq *rte; 606 607 MROUTER6_LOCK(); 608 609 if (V_ip6_mrouter == NULL) { 610 MROUTER6_UNLOCK(); 611 return (EINVAL); 612 } 613 614 /* 615 * For each phyint in use, disable promiscuous reception of all IPv6 616 * multicasts. 617 */ 618 for (mifi = 0; mifi < nummifs; mifi++) { 619 if (mif6table[mifi].m6_ifp && 620 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 621 if_allmulti(mif6table[mifi].m6_ifp, 0); 622 } 623 } 624 bzero((caddr_t)mif6table, sizeof(mif6table)); 625 nummifs = 0; 626 627 V_pim6 = 0; /* used to stub out/in pim specific code */ 628 629 callout_stop(&expire_upcalls_ch); 630 631 /* 632 * Free all multicast forwarding cache entries. 633 */ 634 MFC6_LOCK(); 635 for (i = 0; i < MF6CTBLSIZ; i++) { 636 rt = mf6ctable[i]; 637 while (rt) { 638 struct mf6c *frt; 639 640 for (rte = rt->mf6c_stall; rte != NULL; ) { 641 struct rtdetq *n = rte->next; 642 643 m_freem(rte->m); 644 free(rte, M_MRTABLE6); 645 rte = n; 646 } 647 frt = rt; 648 rt = rt->mf6c_next; 649 free(frt, M_MRTABLE6); 650 } 651 } 652 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 653 MFC6_UNLOCK(); 654 655 /* 656 * Reset register interface 657 */ 658 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 659 if_detach(multicast_register_if6); 660 if_free(multicast_register_if6); 661 reg_mif_num = (mifi_t)-1; 662 multicast_register_if6 = NULL; 663 } 664 665 V_ip6_mrouter = NULL; 666 V_ip6_mrouter_ver = 0; 667 668 MROUTER6_UNLOCK(); 669 MRT6_DLOG(DEBUG_ANY, "finished"); 670 671 return (0); 672 } 673 674 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 675 676 /* 677 * Add a mif to the mif table 678 */ 679 static int 680 add_m6if(struct mif6ctl *mifcp) 681 { 682 struct mif6 *mifp; 683 struct ifnet *ifp; 684 int error; 685 686 MIF6_LOCK(); 687 688 if (mifcp->mif6c_mifi >= MAXMIFS) { 689 MIF6_UNLOCK(); 690 return (EINVAL); 691 } 692 mifp = mif6table + mifcp->mif6c_mifi; 693 if (mifp->m6_ifp != NULL) { 694 MIF6_UNLOCK(); 695 return (EADDRINUSE); /* XXX: is it appropriate? */ 696 } 697 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 698 MIF6_UNLOCK(); 699 return (ENXIO); 700 } 701 702 ifp = ifnet_byindex(mifcp->mif6c_pifi); 703 704 if (mifcp->mif6c_flags & MIFF_REGISTER) { 705 if (reg_mif_num == (mifi_t)-1) { 706 ifp = if_alloc(IFT_OTHER); 707 708 if_initname(ifp, "register_mif", 0); 709 ifp->if_flags |= IFF_LOOPBACK; 710 if_attach(ifp); 711 multicast_register_if6 = ifp; 712 reg_mif_num = mifcp->mif6c_mifi; 713 /* 714 * it is impossible to guess the ifindex of the 715 * register interface. So mif6c_pifi is automatically 716 * calculated. 717 */ 718 mifcp->mif6c_pifi = ifp->if_index; 719 } else { 720 ifp = multicast_register_if6; 721 } 722 } else { 723 /* Make sure the interface supports multicast */ 724 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 725 MIF6_UNLOCK(); 726 return (EOPNOTSUPP); 727 } 728 729 error = if_allmulti(ifp, 1); 730 if (error) { 731 MIF6_UNLOCK(); 732 return (error); 733 } 734 } 735 736 mifp->m6_flags = mifcp->mif6c_flags; 737 mifp->m6_ifp = ifp; 738 739 /* initialize per mif pkt counters */ 740 mifp->m6_pkt_in = 0; 741 mifp->m6_pkt_out = 0; 742 mifp->m6_bytes_in = 0; 743 mifp->m6_bytes_out = 0; 744 745 /* Adjust nummifs up if the mifi is higher than nummifs */ 746 if (nummifs <= mifcp->mif6c_mifi) 747 nummifs = mifcp->mif6c_mifi + 1; 748 749 MIF6_UNLOCK(); 750 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 751 if_name(ifp)); 752 753 return (0); 754 } 755 756 /* 757 * Delete a mif from the mif table 758 */ 759 static int 760 del_m6if_locked(mifi_t *mifip) 761 { 762 struct mif6 *mifp = mif6table + *mifip; 763 mifi_t mifi; 764 struct ifnet *ifp; 765 766 MIF6_LOCK_ASSERT(); 767 768 if (*mifip >= nummifs) 769 return (EINVAL); 770 if (mifp->m6_ifp == NULL) 771 return (EINVAL); 772 773 if (!(mifp->m6_flags & MIFF_REGISTER)) { 774 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 775 ifp = mifp->m6_ifp; 776 if_allmulti(ifp, 0); 777 } else { 778 if (reg_mif_num != (mifi_t)-1 && 779 multicast_register_if6 != NULL) { 780 if_detach(multicast_register_if6); 781 if_free(multicast_register_if6); 782 reg_mif_num = (mifi_t)-1; 783 multicast_register_if6 = NULL; 784 } 785 } 786 787 bzero((caddr_t)mifp, sizeof(*mifp)); 788 789 /* Adjust nummifs down */ 790 for (mifi = nummifs; mifi > 0; mifi--) 791 if (mif6table[mifi - 1].m6_ifp) 792 break; 793 nummifs = mifi; 794 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 795 796 return (0); 797 } 798 799 static int 800 del_m6if(mifi_t *mifip) 801 { 802 int cc; 803 804 MIF6_LOCK(); 805 cc = del_m6if_locked(mifip); 806 MIF6_UNLOCK(); 807 808 return (cc); 809 } 810 811 /* 812 * Add an mfc entry 813 */ 814 static int 815 add_m6fc(struct mf6cctl *mfccp) 816 { 817 struct mf6c *rt; 818 u_long hash; 819 struct rtdetq *rte; 820 u_short nstl; 821 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 822 823 MFC6_LOCK(); 824 825 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 826 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 827 828 /* If an entry already exists, just update the fields */ 829 if (rt) { 830 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 831 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 832 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 833 mfccp->mf6cc_parent); 834 835 rt->mf6c_parent = mfccp->mf6cc_parent; 836 rt->mf6c_ifset = mfccp->mf6cc_ifset; 837 838 MFC6_UNLOCK(); 839 return (0); 840 } 841 842 /* 843 * Find the entry for which the upcall was made and update 844 */ 845 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 846 mfccp->mf6cc_mcastgrp.sin6_addr); 847 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 848 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 849 &mfccp->mf6cc_origin.sin6_addr) && 850 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 851 &mfccp->mf6cc_mcastgrp.sin6_addr) && 852 (rt->mf6c_stall != NULL)) { 853 if (nstl++) 854 log(LOG_ERR, 855 "add_m6fc: %s o %s g %s p %x dbx %p\n", 856 "multiple kernel entries", 857 ip6_sprintf(ip6bufo, 858 &mfccp->mf6cc_origin.sin6_addr), 859 ip6_sprintf(ip6bufg, 860 &mfccp->mf6cc_mcastgrp.sin6_addr), 861 mfccp->mf6cc_parent, rt->mf6c_stall); 862 863 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 864 ip6_sprintf(ip6bufo, 865 &mfccp->mf6cc_origin.sin6_addr), 866 ip6_sprintf(ip6bufg, 867 &mfccp->mf6cc_mcastgrp.sin6_addr), 868 mfccp->mf6cc_parent, rt->mf6c_stall); 869 870 rt->mf6c_origin = mfccp->mf6cc_origin; 871 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 872 rt->mf6c_parent = mfccp->mf6cc_parent; 873 rt->mf6c_ifset = mfccp->mf6cc_ifset; 874 /* initialize pkt counters per src-grp */ 875 rt->mf6c_pkt_cnt = 0; 876 rt->mf6c_byte_cnt = 0; 877 rt->mf6c_wrong_if = 0; 878 879 rt->mf6c_expire = 0; /* Don't clean this guy up */ 880 n6expire[hash]--; 881 882 /* free packets Qed at the end of this entry */ 883 for (rte = rt->mf6c_stall; rte != NULL; ) { 884 struct rtdetq *n = rte->next; 885 ip6_mdq(rte->m, rte->ifp, rt); 886 m_freem(rte->m); 887 #ifdef UPCALL_TIMING 888 collate(&(rte->t)); 889 #endif /* UPCALL_TIMING */ 890 free(rte, M_MRTABLE6); 891 rte = n; 892 } 893 rt->mf6c_stall = NULL; 894 } 895 } 896 897 /* 898 * It is possible that an entry is being inserted without an upcall 899 */ 900 if (nstl == 0) { 901 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 902 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 903 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 904 mfccp->mf6cc_parent); 905 906 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 907 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 908 &mfccp->mf6cc_origin.sin6_addr)&& 909 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 910 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 911 rt->mf6c_origin = mfccp->mf6cc_origin; 912 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 913 rt->mf6c_parent = mfccp->mf6cc_parent; 914 rt->mf6c_ifset = mfccp->mf6cc_ifset; 915 /* initialize pkt counters per src-grp */ 916 rt->mf6c_pkt_cnt = 0; 917 rt->mf6c_byte_cnt = 0; 918 rt->mf6c_wrong_if = 0; 919 920 if (rt->mf6c_expire) 921 n6expire[hash]--; 922 rt->mf6c_expire = 0; 923 } 924 } 925 if (rt == NULL) { 926 /* no upcall, so make a new entry */ 927 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 928 M_NOWAIT); 929 if (rt == NULL) { 930 MFC6_UNLOCK(); 931 return (ENOBUFS); 932 } 933 934 /* insert new entry at head of hash chain */ 935 rt->mf6c_origin = mfccp->mf6cc_origin; 936 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 937 rt->mf6c_parent = mfccp->mf6cc_parent; 938 rt->mf6c_ifset = mfccp->mf6cc_ifset; 939 /* initialize pkt counters per src-grp */ 940 rt->mf6c_pkt_cnt = 0; 941 rt->mf6c_byte_cnt = 0; 942 rt->mf6c_wrong_if = 0; 943 rt->mf6c_expire = 0; 944 rt->mf6c_stall = NULL; 945 946 /* link into table */ 947 rt->mf6c_next = mf6ctable[hash]; 948 mf6ctable[hash] = rt; 949 } 950 } 951 952 MFC6_UNLOCK(); 953 return (0); 954 } 955 956 #ifdef UPCALL_TIMING 957 /* 958 * collect delay statistics on the upcalls 959 */ 960 static void 961 collate(struct timeval *t) 962 { 963 u_long d; 964 struct timeval tp; 965 u_long delta; 966 967 GET_TIME(tp); 968 969 if (TV_LT(*t, tp)) 970 { 971 TV_DELTA(tp, *t, delta); 972 973 d = delta >> 10; 974 if (d > UPCALL_MAX) 975 d = UPCALL_MAX; 976 977 ++upcall_data[d]; 978 } 979 } 980 #endif /* UPCALL_TIMING */ 981 982 /* 983 * Delete an mfc entry 984 */ 985 static int 986 del_m6fc(struct mf6cctl *mfccp) 987 { 988 #ifdef MRT6DEBUG 989 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 990 #endif 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 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 1002 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1003 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1004 1005 MFC6_LOCK(); 1006 1007 nptr = &mf6ctable[hash]; 1008 while ((rt = *nptr) != NULL) { 1009 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1010 &rt->mf6c_origin.sin6_addr) && 1011 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1012 &rt->mf6c_mcastgrp.sin6_addr) && 1013 rt->mf6c_stall == NULL) 1014 break; 1015 1016 nptr = &rt->mf6c_next; 1017 } 1018 if (rt == NULL) { 1019 MFC6_UNLOCK(); 1020 return (EADDRNOTAVAIL); 1021 } 1022 1023 *nptr = rt->mf6c_next; 1024 free(rt, M_MRTABLE6); 1025 1026 MFC6_UNLOCK(); 1027 1028 return (0); 1029 } 1030 1031 static int 1032 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1033 { 1034 1035 if (s) { 1036 if (sbappendaddr(&s->so_rcv, 1037 (struct sockaddr *)src, 1038 mm, (struct mbuf *)0) != 0) { 1039 sorwakeup(s); 1040 return (0); 1041 } 1042 } 1043 m_freem(mm); 1044 return (-1); 1045 } 1046 1047 /* 1048 * IPv6 multicast forwarding function. This function assumes that the packet 1049 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1050 * pointed to by "ifp", and the packet is to be relayed to other networks 1051 * that have members of the packet's destination IPv6 multicast group. 1052 * 1053 * The packet is returned unscathed to the caller, unless it is 1054 * erroneous, in which case a non-zero return value tells the caller to 1055 * discard it. 1056 * 1057 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1058 * this function is called in the originating context (i.e., not when 1059 * forwarding a packet from other node). ip6_output(), which is currently the 1060 * only function that calls this function is called in the originating context, 1061 * explicitly ensures this condition. It is caller's responsibility to ensure 1062 * that if this function is called from somewhere else in the originating 1063 * context in the future. 1064 */ 1065 int 1066 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1067 { 1068 struct rtdetq *rte; 1069 struct mbuf *mb0; 1070 struct mf6c *rt; 1071 struct mif6 *mifp; 1072 struct mbuf *mm; 1073 u_long hash; 1074 mifi_t mifi; 1075 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1076 #ifdef UPCALL_TIMING 1077 struct timeval tp; 1078 1079 GET_TIME(tp); 1080 #endif /* UPCALL_TIMING */ 1081 1082 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1083 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1085 1086 /* 1087 * Don't forward a packet with Hop limit of zero or one, 1088 * or a packet destined to a local-only group. 1089 */ 1090 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1091 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1092 return (0); 1093 ip6->ip6_hlim--; 1094 1095 /* 1096 * Source address check: do not forward packets with unspecified 1097 * source. It was discussed in July 2000, on ipngwg mailing list. 1098 * This is rather more serious than unicast cases, because some 1099 * MLD packets can be sent with the unspecified source address 1100 * (although such packets must normally set 1 to the hop limit field). 1101 */ 1102 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1103 IP6STAT_INC(ip6s_cantforward); 1104 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1105 V_ip6_log_time = time_uptime; 1106 log(LOG_DEBUG, 1107 "cannot forward " 1108 "from %s to %s nxt %d received on %s\n", 1109 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1110 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1111 ip6->ip6_nxt, 1112 if_name(m->m_pkthdr.rcvif)); 1113 } 1114 return (0); 1115 } 1116 1117 MFC6_LOCK(); 1118 1119 /* 1120 * Determine forwarding mifs from the forwarding cache table 1121 */ 1122 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1123 MRT6STAT_INC(mrt6s_mfc_lookups); 1124 1125 /* Entry exists, so forward if necessary */ 1126 if (rt) { 1127 MFC6_UNLOCK(); 1128 return (ip6_mdq(m, ifp, rt)); 1129 } 1130 1131 /* 1132 * If we don't have a route for packet's origin, 1133 * Make a copy of the packet & send message to routing daemon. 1134 */ 1135 MRT6STAT_INC(mrt6s_no_route); 1136 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1137 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1138 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1139 1140 /* 1141 * Allocate mbufs early so that we don't do extra work if we 1142 * are just going to fail anyway. 1143 */ 1144 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1145 if (rte == NULL) { 1146 MFC6_UNLOCK(); 1147 return (ENOBUFS); 1148 } 1149 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1150 /* 1151 * Pullup packet header if needed before storing it, 1152 * as other references may modify it in the meantime. 1153 */ 1154 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1155 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1156 if (mb0 == NULL) { 1157 free(rte, M_MRTABLE6); 1158 MFC6_UNLOCK(); 1159 return (ENOBUFS); 1160 } 1161 1162 /* is there an upcall waiting for this packet? */ 1163 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1164 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1165 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1166 &rt->mf6c_origin.sin6_addr) && 1167 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1168 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1169 break; 1170 } 1171 1172 if (rt == NULL) { 1173 struct mrt6msg *im; 1174 #ifdef MRT6_OINIT 1175 struct omrt6msg *oim; 1176 #endif 1177 /* no upcall, so make a new entry */ 1178 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1179 if (rt == NULL) { 1180 free(rte, M_MRTABLE6); 1181 m_freem(mb0); 1182 MFC6_UNLOCK(); 1183 return (ENOBUFS); 1184 } 1185 /* 1186 * Make a copy of the header to send to the user 1187 * level process 1188 */ 1189 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT); 1190 if (mm == NULL) { 1191 free(rte, M_MRTABLE6); 1192 m_freem(mb0); 1193 free(rt, M_MRTABLE6); 1194 MFC6_UNLOCK(); 1195 return (ENOBUFS); 1196 } 1197 1198 /* 1199 * Send message to routing daemon 1200 */ 1201 sin6.sin6_addr = ip6->ip6_src; 1202 im = NULL; 1203 #ifdef MRT6_OINIT 1204 oim = NULL; 1205 #endif 1206 switch (V_ip6_mrouter_ver) { 1207 #ifdef MRT6_OINIT 1208 case MRT6_OINIT: 1209 oim = mtod(mm, struct omrt6msg *); 1210 oim->im6_msgtype = MRT6MSG_NOCACHE; 1211 oim->im6_mbz = 0; 1212 break; 1213 #endif 1214 case MRT6_INIT: 1215 im = mtod(mm, struct mrt6msg *); 1216 im->im6_msgtype = MRT6MSG_NOCACHE; 1217 im->im6_mbz = 0; 1218 break; 1219 default: 1220 free(rte, M_MRTABLE6); 1221 m_freem(mb0); 1222 free(rt, M_MRTABLE6); 1223 MFC6_UNLOCK(); 1224 return (EINVAL); 1225 } 1226 1227 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1228 for (mifp = mif6table, mifi = 0; 1229 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1230 ; 1231 1232 switch (V_ip6_mrouter_ver) { 1233 #ifdef MRT6_OINIT 1234 case MRT6_OINIT: 1235 oim->im6_mif = mifi; 1236 break; 1237 #endif 1238 case MRT6_INIT: 1239 im->im6_mif = mifi; 1240 break; 1241 } 1242 1243 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1244 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1245 "socket queue full\n"); 1246 MRT6STAT_INC(mrt6s_upq_sockfull); 1247 free(rte, M_MRTABLE6); 1248 m_freem(mb0); 1249 free(rt, M_MRTABLE6); 1250 MFC6_UNLOCK(); 1251 return (ENOBUFS); 1252 } 1253 1254 MRT6STAT_INC(mrt6s_upcalls); 1255 1256 /* insert new entry at head of hash chain */ 1257 bzero(rt, sizeof(*rt)); 1258 rt->mf6c_origin.sin6_family = AF_INET6; 1259 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1260 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1261 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1262 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1263 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1264 rt->mf6c_expire = UPCALL_EXPIRE; 1265 n6expire[hash]++; 1266 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1267 1268 /* link into table */ 1269 rt->mf6c_next = mf6ctable[hash]; 1270 mf6ctable[hash] = rt; 1271 /* Add this entry to the end of the queue */ 1272 rt->mf6c_stall = rte; 1273 } else { 1274 /* determine if q has overflowed */ 1275 struct rtdetq **p; 1276 int npkts = 0; 1277 1278 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1279 if (++npkts > MAX_UPQ6) { 1280 MRT6STAT_INC(mrt6s_upq_ovflw); 1281 free(rte, M_MRTABLE6); 1282 m_freem(mb0); 1283 MFC6_UNLOCK(); 1284 return (0); 1285 } 1286 1287 /* Add this entry to the end of the queue */ 1288 *p = rte; 1289 } 1290 1291 rte->next = NULL; 1292 rte->m = mb0; 1293 rte->ifp = ifp; 1294 #ifdef UPCALL_TIMING 1295 rte->t = tp; 1296 #endif /* UPCALL_TIMING */ 1297 1298 MFC6_UNLOCK(); 1299 1300 return (0); 1301 } 1302 1303 /* 1304 * Clean up cache entries if upcalls are not serviced 1305 * Call from the Slow Timeout mechanism, every half second. 1306 */ 1307 static void 1308 expire_upcalls(void *unused) 1309 { 1310 #ifdef MRT6DEBUG 1311 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1312 #endif 1313 struct rtdetq *rte; 1314 struct mf6c *mfc, **nptr; 1315 u_long i; 1316 1317 MFC6_LOCK(); 1318 for (i = 0; i < MF6CTBLSIZ; i++) { 1319 if (n6expire[i] == 0) 1320 continue; 1321 nptr = &mf6ctable[i]; 1322 while ((mfc = *nptr) != NULL) { 1323 rte = mfc->mf6c_stall; 1324 /* 1325 * Skip real cache entries 1326 * Make sure it wasn't marked to not expire (shouldn't happen) 1327 * If it expires now 1328 */ 1329 if (rte != NULL && 1330 mfc->mf6c_expire != 0 && 1331 --mfc->mf6c_expire == 0) { 1332 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1333 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1334 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1335 /* 1336 * drop all the packets 1337 * free the mbuf with the pkt, if, timing info 1338 */ 1339 do { 1340 struct rtdetq *n = rte->next; 1341 m_freem(rte->m); 1342 free(rte, M_MRTABLE6); 1343 rte = n; 1344 } while (rte != NULL); 1345 MRT6STAT_INC(mrt6s_cache_cleanups); 1346 n6expire[i]--; 1347 1348 *nptr = mfc->mf6c_next; 1349 free(mfc, M_MRTABLE6); 1350 } else { 1351 nptr = &mfc->mf6c_next; 1352 } 1353 } 1354 } 1355 MFC6_UNLOCK(); 1356 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1357 expire_upcalls, NULL); 1358 } 1359 1360 /* 1361 * Packet forwarding routine once entry in the cache is made 1362 */ 1363 static int 1364 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1365 { 1366 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1367 mifi_t mifi, iif; 1368 struct mif6 *mifp; 1369 int plen = m->m_pkthdr.len; 1370 struct in6_addr src0, dst0; /* copies for local work */ 1371 u_int32_t iszone, idzone, oszone, odzone; 1372 int error = 0; 1373 1374 /* 1375 * Don't forward if it didn't arrive from the parent mif 1376 * for its origin. 1377 */ 1378 mifi = rt->mf6c_parent; 1379 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1380 /* came in the wrong interface */ 1381 MRT6_DLOG(DEBUG_FORWARD, 1382 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1383 mifi, mif6table[mifi].m6_ifp->if_index); 1384 MRT6STAT_INC(mrt6s_wrong_if); 1385 rt->mf6c_wrong_if++; 1386 /* 1387 * If we are doing PIM processing, and we are forwarding 1388 * packets on this interface, send a message to the 1389 * routing daemon. 1390 */ 1391 /* have to make sure this is a valid mif */ 1392 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1393 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1394 /* 1395 * Check the M_LOOP flag to avoid an 1396 * unnecessary PIM assert. 1397 * XXX: M_LOOP is an ad-hoc hack... 1398 */ 1399 static struct sockaddr_in6 sin6 = 1400 { sizeof(sin6), AF_INET6 }; 1401 1402 struct mbuf *mm; 1403 struct mrt6msg *im; 1404 #ifdef MRT6_OINIT 1405 struct omrt6msg *oim; 1406 #endif 1407 1408 mm = m_copym(m, 0, sizeof(struct ip6_hdr), 1409 M_NOWAIT); 1410 if (mm && 1411 (!M_WRITABLE(mm) || 1412 mm->m_len < sizeof(struct ip6_hdr))) 1413 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1414 if (mm == NULL) 1415 return (ENOBUFS); 1416 1417 #ifdef MRT6_OINIT 1418 oim = NULL; 1419 #endif 1420 im = NULL; 1421 switch (V_ip6_mrouter_ver) { 1422 #ifdef MRT6_OINIT 1423 case MRT6_OINIT: 1424 oim = mtod(mm, struct omrt6msg *); 1425 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1426 oim->im6_mbz = 0; 1427 break; 1428 #endif 1429 case MRT6_INIT: 1430 im = mtod(mm, struct mrt6msg *); 1431 im->im6_msgtype = MRT6MSG_WRONGMIF; 1432 im->im6_mbz = 0; 1433 break; 1434 default: 1435 m_freem(mm); 1436 return (EINVAL); 1437 } 1438 1439 for (mifp = mif6table, iif = 0; 1440 iif < nummifs && mifp && 1441 mifp->m6_ifp != ifp; 1442 mifp++, iif++) 1443 ; 1444 1445 switch (V_ip6_mrouter_ver) { 1446 #ifdef MRT6_OINIT 1447 case MRT6_OINIT: 1448 oim->im6_mif = iif; 1449 sin6.sin6_addr = oim->im6_src; 1450 break; 1451 #endif 1452 case MRT6_INIT: 1453 im->im6_mif = iif; 1454 sin6.sin6_addr = im->im6_src; 1455 break; 1456 } 1457 1458 MRT6STAT_INC(mrt6s_upcalls); 1459 1460 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1461 MRT6_DLOG(DEBUG_ANY, 1462 "ip6_mrouter socket queue full"); 1463 MRT6STAT_INC(mrt6s_upq_sockfull); 1464 return (ENOBUFS); 1465 } /* if socket Q full */ 1466 } /* if PIM */ 1467 return (0); 1468 } /* if wrong iif */ 1469 1470 /* If I sourced this packet, it counts as output, else it was input. */ 1471 if (m->m_pkthdr.rcvif == NULL) { 1472 /* XXX: is rcvif really NULL when output?? */ 1473 mif6table[mifi].m6_pkt_out++; 1474 mif6table[mifi].m6_bytes_out += plen; 1475 } else { 1476 mif6table[mifi].m6_pkt_in++; 1477 mif6table[mifi].m6_bytes_in += plen; 1478 } 1479 rt->mf6c_pkt_cnt++; 1480 rt->mf6c_byte_cnt += plen; 1481 1482 /* 1483 * For each mif, forward a copy of the packet if there are group 1484 * members downstream on the interface. 1485 */ 1486 src0 = ip6->ip6_src; 1487 dst0 = ip6->ip6_dst; 1488 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1489 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1490 IP6STAT_INC(ip6s_badscope); 1491 return (error); 1492 } 1493 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1494 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1495 /* 1496 * check if the outgoing packet is going to break 1497 * a scope boundary. 1498 * XXX For packets through PIM register tunnel 1499 * interface, we believe a routing daemon. 1500 */ 1501 if (!(mif6table[rt->mf6c_parent].m6_flags & 1502 MIFF_REGISTER) && 1503 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1504 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1505 &oszone) || 1506 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1507 &odzone) || 1508 iszone != oszone || 1509 idzone != odzone) { 1510 IP6STAT_INC(ip6s_badscope); 1511 continue; 1512 } 1513 } 1514 1515 mifp->m6_pkt_out++; 1516 mifp->m6_bytes_out += plen; 1517 if (mifp->m6_flags & MIFF_REGISTER) 1518 register_send(ip6, mifp, m); 1519 else 1520 phyint_send(ip6, mifp, m); 1521 } 1522 } 1523 return (0); 1524 } 1525 1526 static void 1527 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1528 { 1529 #ifdef MRT6DEBUG 1530 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1531 #endif 1532 struct mbuf *mb_copy; 1533 struct ifnet *ifp = mifp->m6_ifp; 1534 int error = 0; 1535 u_long linkmtu; 1536 1537 /* 1538 * Make a new reference to the packet; make sure that 1539 * the IPv6 header is actually copied, not just referenced, 1540 * so that ip6_output() only scribbles on the copy. 1541 */ 1542 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1543 if (mb_copy && 1544 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1545 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1546 if (mb_copy == NULL) { 1547 return; 1548 } 1549 /* set MCAST flag to the outgoing packet */ 1550 mb_copy->m_flags |= M_MCAST; 1551 1552 /* 1553 * If we sourced the packet, call ip6_output since we may devide 1554 * the packet into fragments when the packet is too big for the 1555 * outgoing interface. 1556 * Otherwise, we can simply send the packet to the interface 1557 * sending queue. 1558 */ 1559 if (m->m_pkthdr.rcvif == NULL) { 1560 struct ip6_moptions im6o; 1561 struct epoch_tracker et; 1562 1563 im6o.im6o_multicast_ifp = ifp; 1564 /* XXX: ip6_output will override ip6->ip6_hlim */ 1565 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1566 im6o.im6o_multicast_loop = 1; 1567 NET_EPOCH_ENTER(et); 1568 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1569 NULL, NULL); 1570 NET_EPOCH_EXIT(et); 1571 1572 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1573 (uint16_t)(mifp - mif6table), error); 1574 return; 1575 } 1576 1577 /* 1578 * If configured to loop back multicasts by default, 1579 * loop back a copy now. 1580 */ 1581 if (in6_mcast_loop) 1582 ip6_mloopback(ifp, m); 1583 1584 /* 1585 * Put the packet into the sending queue of the outgoing interface 1586 * if it would fit in the MTU of the interface. 1587 */ 1588 linkmtu = IN6_LINKMTU(ifp); 1589 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1590 struct sockaddr_in6 dst6; 1591 1592 bzero(&dst6, sizeof(dst6)); 1593 dst6.sin6_len = sizeof(struct sockaddr_in6); 1594 dst6.sin6_family = AF_INET6; 1595 dst6.sin6_addr = ip6->ip6_dst; 1596 1597 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1598 /* 1599 * We just call if_output instead of nd6_output here, since 1600 * we need no ND for a multicast forwarded packet...right? 1601 */ 1602 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1603 error = (*ifp->if_output)(ifp, mb_copy, 1604 (struct sockaddr *)&dst6, NULL); 1605 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1606 (uint16_t)(mifp - mif6table), error); 1607 } else { 1608 /* 1609 * pMTU discovery is intentionally disabled by default, since 1610 * various router may notify pMTU in multicast, which can be 1611 * a DDoS to a router 1612 */ 1613 if (V_ip6_mcast_pmtu) 1614 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1615 else { 1616 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1617 "g %s size %d (discarded)", if_name(ifp), 1618 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1619 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1620 mb_copy->m_pkthdr.len); 1621 m_freem(mb_copy); /* simply discard the packet */ 1622 } 1623 } 1624 } 1625 1626 static int 1627 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1628 { 1629 #ifdef MRT6DEBUG 1630 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1631 #endif 1632 struct mbuf *mm; 1633 int i, len = m->m_pkthdr.len; 1634 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1635 struct mrt6msg *im6; 1636 1637 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1638 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1639 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1640 PIM6STAT_INC(pim6s_snd_registers); 1641 1642 /* Make a copy of the packet to send to the user level process. */ 1643 mm = m_gethdr(M_NOWAIT, MT_DATA); 1644 if (mm == NULL) 1645 return (ENOBUFS); 1646 mm->m_data += max_linkhdr; 1647 mm->m_len = sizeof(struct ip6_hdr); 1648 1649 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 1650 m_freem(mm); 1651 return (ENOBUFS); 1652 } 1653 i = MHLEN - M_LEADINGSPACE(mm); 1654 if (i > len) 1655 i = len; 1656 mm = m_pullup(mm, i); 1657 if (mm == NULL) 1658 return (ENOBUFS); 1659 /* TODO: check it! */ 1660 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1661 1662 /* 1663 * Send message to routing daemon 1664 */ 1665 sin6.sin6_addr = ip6->ip6_src; 1666 1667 im6 = mtod(mm, struct mrt6msg *); 1668 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1669 im6->im6_mbz = 0; 1670 1671 im6->im6_mif = mif - mif6table; 1672 1673 /* iif info is not given for reg. encap.n */ 1674 MRT6STAT_INC(mrt6s_upcalls); 1675 1676 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1677 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1678 MRT6STAT_INC(mrt6s_upq_sockfull); 1679 return (ENOBUFS); 1680 } 1681 return (0); 1682 } 1683 1684 /* 1685 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1686 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1687 * into the kernel. 1688 */ 1689 static int 1690 pim6_encapcheck(const struct mbuf *m __unused, int off __unused, 1691 int proto __unused, void *arg __unused) 1692 { 1693 1694 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1695 return (8); /* claim the datagram. */ 1696 } 1697 1698 /* 1699 * PIM sparse mode hook 1700 * Receives the pim control messages, and passes them up to the listening 1701 * socket, using rip6_input. 1702 * The only message processed is the REGISTER pim message; the pim header 1703 * is stripped off, and the inner packet is passed to register_mforward. 1704 */ 1705 static int 1706 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused) 1707 { 1708 struct pim *pim; /* pointer to a pim struct */ 1709 struct ip6_hdr *ip6; 1710 int pimlen; 1711 int minlen; 1712 1713 PIM6STAT_INC(pim6s_rcv_total); 1714 1715 /* 1716 * Validate lengths 1717 */ 1718 pimlen = m->m_pkthdr.len - off; 1719 if (pimlen < PIM_MINLEN) { 1720 PIM6STAT_INC(pim6s_rcv_tooshort); 1721 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1722 m_freem(m); 1723 return (IPPROTO_DONE); 1724 } 1725 1726 /* 1727 * if the packet is at least as big as a REGISTER, go ahead 1728 * and grab the PIM REGISTER header size, to avoid another 1729 * possible m_pullup() later. 1730 * 1731 * PIM_MINLEN == pimhdr + u_int32 == 8 1732 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1733 */ 1734 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1735 1736 /* 1737 * Make sure that the IP6 and PIM headers in contiguous memory, and 1738 * possibly the PIM REGISTER header 1739 */ 1740 if (m->m_len < off + minlen) { 1741 m = m_pullup(m, off + minlen); 1742 if (m == NULL) { 1743 IP6STAT_INC(ip6s_exthdrtoolong); 1744 return (IPPROTO_DONE); 1745 } 1746 } 1747 ip6 = mtod(m, struct ip6_hdr *); 1748 pim = (struct pim *)((caddr_t)ip6 + off); 1749 1750 #define PIM6_CHECKSUM 1751 #ifdef PIM6_CHECKSUM 1752 { 1753 int cksumlen; 1754 1755 /* 1756 * Validate checksum. 1757 * If PIM REGISTER, exclude the data packet 1758 */ 1759 if (pim->pim_type == PIM_REGISTER) 1760 cksumlen = PIM_MINLEN; 1761 else 1762 cksumlen = pimlen; 1763 1764 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1765 PIM6STAT_INC(pim6s_rcv_badsum); 1766 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1767 m_freem(m); 1768 return (IPPROTO_DONE); 1769 } 1770 } 1771 #endif /* PIM_CHECKSUM */ 1772 1773 /* PIM version check */ 1774 if (pim->pim_ver != PIM_VERSION) { 1775 PIM6STAT_INC(pim6s_rcv_badversion); 1776 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1777 "incorrect version %d, expecting %d", 1778 pim->pim_ver, PIM_VERSION); 1779 m_freem(m); 1780 return (IPPROTO_DONE); 1781 } 1782 1783 if (pim->pim_type == PIM_REGISTER) { 1784 /* 1785 * since this is a REGISTER, we'll make a copy of the register 1786 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1787 * routing daemon. 1788 */ 1789 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1790 1791 struct mbuf *mcp; 1792 struct ip6_hdr *eip6; 1793 u_int32_t *reghdr; 1794 int rc; 1795 #ifdef MRT6DEBUG 1796 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1797 #endif 1798 1799 PIM6STAT_INC(pim6s_rcv_registers); 1800 1801 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1802 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1803 reg_mif_num); 1804 m_freem(m); 1805 return (IPPROTO_DONE); 1806 } 1807 1808 reghdr = (u_int32_t *)(pim + 1); 1809 1810 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1811 goto pim6_input_to_daemon; 1812 1813 /* 1814 * Validate length 1815 */ 1816 if (pimlen < PIM6_REG_MINLEN) { 1817 PIM6STAT_INC(pim6s_rcv_tooshort); 1818 PIM6STAT_INC(pim6s_rcv_badregisters); 1819 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1820 "size too small %d from %s", 1821 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1822 m_freem(m); 1823 return (IPPROTO_DONE); 1824 } 1825 1826 eip6 = (struct ip6_hdr *) (reghdr + 1); 1827 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1828 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1829 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1830 ntohs(eip6->ip6_plen)); 1831 1832 /* verify the version number of the inner packet */ 1833 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1834 PIM6STAT_INC(pim6s_rcv_badregisters); 1835 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1836 "of the inner packet", 1837 (eip6->ip6_vfc & IPV6_VERSION)); 1838 m_freem(m); 1839 return (IPPROTO_DONE); 1840 } 1841 1842 /* verify the inner packet is destined to a mcast group */ 1843 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1844 PIM6STAT_INC(pim6s_rcv_badregisters); 1845 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1846 "is not multicast %s", 1847 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1848 m_freem(m); 1849 return (IPPROTO_DONE); 1850 } 1851 1852 /* 1853 * make a copy of the whole header to pass to the daemon later. 1854 */ 1855 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT); 1856 if (mcp == NULL) { 1857 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1858 "could not copy register head"); 1859 m_freem(m); 1860 return (IPPROTO_DONE); 1861 } 1862 1863 /* 1864 * forward the inner ip6 packet; point m_data at the inner ip6. 1865 */ 1866 m_adj(m, off + PIM_MINLEN); 1867 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1868 "src %s, dst %s, mif %d", 1869 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1870 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1871 1872 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1873 dst.sin6_family, 0); 1874 1875 /* prepare the register head to send to the mrouting daemon */ 1876 m = mcp; 1877 } 1878 1879 /* 1880 * Pass the PIM message up to the daemon; if it is a register message 1881 * pass the 'head' only up to the daemon. This includes the 1882 * encapsulator ip6 header, pim header, register header and the 1883 * encapsulated ip6 header. 1884 */ 1885 pim6_input_to_daemon: 1886 return (rip6_input(&m, &off, proto)); 1887 } 1888 1889 static int 1890 ip6_mroute_modevent(module_t mod, int type, void *unused) 1891 { 1892 1893 switch (type) { 1894 case MOD_LOAD: 1895 MROUTER6_LOCK_INIT(); 1896 MFC6_LOCK_INIT(); 1897 MIF6_LOCK_INIT(); 1898 1899 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg, 1900 NULL, M_WAITOK); 1901 if (pim6_encap_cookie == NULL) { 1902 printf("ip6_mroute: unable to attach pim6 encap\n"); 1903 MIF6_LOCK_DESTROY(); 1904 MFC6_LOCK_DESTROY(); 1905 MROUTER6_LOCK_DESTROY(); 1906 return (EINVAL); 1907 } 1908 1909 ip6_mforward = X_ip6_mforward; 1910 ip6_mrouter_done = X_ip6_mrouter_done; 1911 ip6_mrouter_get = X_ip6_mrouter_get; 1912 ip6_mrouter_set = X_ip6_mrouter_set; 1913 mrt6_ioctl = X_mrt6_ioctl; 1914 break; 1915 1916 case MOD_UNLOAD: 1917 if (V_ip6_mrouter != NULL) 1918 return EINVAL; 1919 1920 if (pim6_encap_cookie) { 1921 ip6_encap_detach(pim6_encap_cookie); 1922 pim6_encap_cookie = NULL; 1923 } 1924 X_ip6_mrouter_done(); 1925 ip6_mforward = NULL; 1926 ip6_mrouter_done = NULL; 1927 ip6_mrouter_get = NULL; 1928 ip6_mrouter_set = NULL; 1929 mrt6_ioctl = NULL; 1930 1931 MIF6_LOCK_DESTROY(); 1932 MFC6_LOCK_DESTROY(); 1933 MROUTER6_LOCK_DESTROY(); 1934 break; 1935 1936 default: 1937 return (EOPNOTSUPP); 1938 } 1939 1940 return (0); 1941 } 1942 1943 static moduledata_t ip6_mroutemod = { 1944 "ip6_mroute", 1945 ip6_mroute_modevent, 1946 0 1947 }; 1948 1949 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY); 1950