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 #include "opt_inet6.h" 85 86 #include <sys/param.h> 87 #include <sys/callout.h> 88 #include <sys/errno.h> 89 #include <sys/kernel.h> 90 #include <sys/lock.h> 91 #include <sys/malloc.h> 92 #include <sys/mbuf.h> 93 #include <sys/module.h> 94 #include <sys/domain.h> 95 #include <sys/protosw.h> 96 #include <sys/sdt.h> 97 #include <sys/signalvar.h> 98 #include <sys/socket.h> 99 #include <sys/socketvar.h> 100 #include <sys/sockio.h> 101 #include <sys/sx.h> 102 #include <sys/sysctl.h> 103 #include <sys/syslog.h> 104 #include <sys/systm.h> 105 #include <sys/time.h> 106 107 #include <net/if.h> 108 #include <net/if_var.h> 109 #include <net/if_private.h> 110 #include <net/if_types.h> 111 #include <net/vnet.h> 112 113 #include <netinet/in.h> 114 #include <netinet/in_var.h> 115 #include <netinet/icmp6.h> 116 #include <netinet/ip_encap.h> 117 118 #include <netinet/ip6.h> 119 #include <netinet/in_kdtrace.h> 120 #include <netinet6/ip6_var.h> 121 #include <netinet6/scope6_var.h> 122 #include <netinet6/nd6.h> 123 #include <netinet6/ip6_mroute.h> 124 #include <netinet6/pim6.h> 125 #include <netinet6/pim6_var.h> 126 127 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 128 129 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 130 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 131 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 132 static int set_pim6(int *); 133 static int socket_send(struct socket *, struct mbuf *, 134 struct sockaddr_in6 *); 135 136 extern int in6_mcast_loop; 137 extern struct domain inet6domain; 138 139 static const struct encaptab *pim6_encap_cookie; 140 static int pim6_encapcheck(const struct mbuf *, int, int, void *); 141 static int pim6_input(struct mbuf *, int, int, void *); 142 143 static const struct encap_config ipv6_encap_cfg = { 144 .proto = IPPROTO_PIM, 145 .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN, 146 .exact_match = 8, 147 .check = pim6_encapcheck, 148 .input = pim6_input 149 }; 150 151 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0; 152 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 153 154 SYSCTL_DECL(_net_inet6); 155 SYSCTL_DECL(_net_inet6_ip6); 156 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, 157 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 158 "PIM"); 159 160 static struct mrt6stat mrt6stat; 161 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 162 &mrt6stat, mrt6stat, 163 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 164 165 #define MRT6STAT_INC(name) mrt6stat.name += 1 166 #define NO_RTE_FOUND 0x1 167 #define RTE_FOUND 0x2 168 169 static struct sx mrouter6_mtx; 170 #define MROUTER6_LOCKPTR() (&mrouter6_mtx) 171 #define MROUTER6_LOCK() sx_xlock(MROUTER6_LOCKPTR()) 172 #define MROUTER6_UNLOCK() sx_xunlock(MROUTER6_LOCKPTR()) 173 #define MROUTER6_LOCK_ASSERT() sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED 174 #define MROUTER6_LOCK_INIT() sx_init(MROUTER6_LOCKPTR(), "mrouter6") 175 #define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR()) 176 177 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 178 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 179 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 180 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 181 "netinet6/ip6_mroute.h)"); 182 183 static struct mtx mfc6_mtx; 184 #define MFC6_LOCKPTR() (&mfc6_mtx) 185 #define MFC6_LOCK() mtx_lock(MFC6_LOCKPTR()) 186 #define MFC6_UNLOCK() mtx_unlock(MFC6_LOCKPTR()) 187 #define MFC6_LOCK_ASSERT() mtx_assert(MFC6_LOCKPTR(), MA_OWNED) 188 #define MFC6_LOCK_INIT() mtx_init(MFC6_LOCKPTR(), \ 189 "IPv6 multicast forwarding cache", \ 190 NULL, MTX_DEF) 191 #define MFC6_LOCK_DESTROY() mtx_destroy(MFC6_LOCKPTR()) 192 193 static u_char n6expire[MF6CTBLSIZ]; 194 195 static struct mif6 mif6table[MAXMIFS]; 196 static int 197 sysctl_mif6table(SYSCTL_HANDLER_ARGS) 198 { 199 struct mif6_sctl *out; 200 int error; 201 202 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, 203 M_WAITOK | M_ZERO); 204 for (int i = 0; i < MAXMIFS; i++) { 205 out[i].m6_flags = mif6table[i].m6_flags; 206 out[i].m6_rate_limit = mif6table[i].m6_rate_limit; 207 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr; 208 if (mif6table[i].m6_ifp != NULL) 209 out[i].m6_ifp = mif6table[i].m6_ifp->if_index; 210 else 211 out[i].m6_ifp = 0; 212 out[i].m6_pkt_in = mif6table[i].m6_pkt_in; 213 out[i].m6_pkt_out = mif6table[i].m6_pkt_out; 214 out[i].m6_bytes_in = mif6table[i].m6_bytes_in; 215 out[i].m6_bytes_out = mif6table[i].m6_bytes_out; 216 } 217 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS); 218 free(out, M_TEMP); 219 return (error); 220 } 221 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, 222 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 223 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]", 224 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], " 225 "netinet6/ip6_mroute.h)"); 226 227 static struct mtx mif6_mtx; 228 #define MIF6_LOCKPTR() (&mif6_mtx) 229 #define MIF6_LOCK() mtx_lock(MIF6_LOCKPTR()) 230 #define MIF6_UNLOCK() mtx_unlock(MIF6_LOCKPTR()) 231 #define MIF6_LOCK_ASSERT() mtx_assert(MIF6_LOCKPTR(), MA_OWNED) 232 #define MIF6_LOCK_INIT() \ 233 mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF) 234 #define MIF6_LOCK_DESTROY() mtx_destroy(MIF6_LOCKPTR()) 235 236 #ifdef MRT6DEBUG 237 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */ 238 #define V_mrt6debug VNET(mrt6debug) 239 #define DEBUG_MFC 0x02 240 #define DEBUG_FORWARD 0x04 241 #define DEBUG_EXPIRE 0x08 242 #define DEBUG_XMIT 0x10 243 #define DEBUG_REG 0x20 244 #define DEBUG_PIM 0x40 245 #define DEBUG_ERR 0x80 246 #define DEBUG_ANY 0x7f 247 #define MRT6_DLOG(m, fmt, ...) \ 248 if (V_mrt6debug & (m)) \ 249 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 250 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 251 #else 252 #define MRT6_DLOG(m, fmt, ...) 253 #endif 254 255 static void expire_upcalls(void *); 256 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 257 #define UPCALL_EXPIRE 6 /* number of timeouts */ 258 259 /* 260 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 261 */ 262 263 /* 264 * 'Interfaces' associated with decapsulator (so we can tell 265 * packets that went through it from ones that get reflected 266 * by a broken gateway). Different from IPv4 register_if, 267 * these interfaces are linked into the system ifnet list, 268 * because per-interface IPv6 statistics are maintained in 269 * ifp->if_afdata. But it does not have any routes point 270 * to them. I.e., packets can't be sent this way. They 271 * only exist as a placeholder for multicast source 272 * verification. 273 */ 274 static struct ifnet *multicast_register_if6; 275 276 #define ENCAP_HOPS 64 277 278 /* 279 * Private variables. 280 */ 281 static mifi_t nummifs = 0; 282 static mifi_t reg_mif_num = (mifi_t)-1; 283 284 static struct pim6stat pim6stat; 285 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 286 &pim6stat, pim6stat, 287 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 288 289 #define PIM6STAT_INC(name) pim6stat.name += 1 290 VNET_DEFINE_STATIC(int, pim6); 291 #define V_pim6 VNET(pim6) 292 293 /* 294 * Hash function for a source, group entry 295 */ 296 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 297 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 298 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 299 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 300 301 /* 302 * Find a route for a given origin IPv6 address and Multicast group address. 303 */ 304 #define MF6CFIND(o, g, rt) do { \ 305 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 306 rt = NULL; \ 307 while (_rt) { \ 308 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 309 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 310 (_rt->mf6c_stall == NULL)) { \ 311 rt = _rt; \ 312 break; \ 313 } \ 314 _rt = _rt->mf6c_next; \ 315 } \ 316 if (rt == NULL) { \ 317 MRT6STAT_INC(mrt6s_mfc_misses); \ 318 } \ 319 } while (/*CONSTCOND*/ 0) 320 321 /* 322 * Macros to compute elapsed time efficiently 323 * Borrowed from Van Jacobson's scheduling code 324 * XXX: replace with timersub() ? 325 */ 326 #define TV_DELTA(a, b, delta) do { \ 327 int xxs; \ 328 \ 329 delta = (a).tv_usec - (b).tv_usec; \ 330 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 331 switch (xxs) { \ 332 case 2: \ 333 delta += 1000000; \ 334 /* FALLTHROUGH */ \ 335 case 1: \ 336 delta += 1000000; \ 337 break; \ 338 default: \ 339 delta += (1000000 * xxs); \ 340 } \ 341 } \ 342 } while (/*CONSTCOND*/ 0) 343 344 /* XXX: replace with timercmp(a, b, <) ? */ 345 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 346 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 347 348 #ifdef UPCALL_TIMING 349 #define UPCALL_MAX 50 350 static u_long upcall_data[UPCALL_MAX + 1]; 351 static void collate(); 352 #endif /* UPCALL_TIMING */ 353 354 static int ip6_mrouter_init(struct socket *, int, int); 355 static int add_m6fc(struct mf6cctl *); 356 static int add_m6if(struct mif6ctl *); 357 static int del_m6fc(struct mf6cctl *); 358 static int del_m6if(mifi_t *); 359 static int del_m6if_locked(mifi_t *); 360 static int get_mif6_cnt(struct sioc_mif_req6 *); 361 static int get_sg_cnt(struct sioc_sg_req6 *); 362 363 static struct callout expire_upcalls_ch; 364 365 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 366 int X_ip6_mrouter_done(void); 367 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 368 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 369 int X_mrt6_ioctl(u_long, caddr_t); 370 371 /* 372 * Handle MRT setsockopt commands to modify the multicast routing tables. 373 */ 374 int 375 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 376 { 377 int error = 0; 378 int optval; 379 struct mif6ctl mifc; 380 struct mf6cctl mfcc; 381 mifi_t mifi; 382 383 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 384 return (EPERM); 385 386 switch (sopt->sopt_name) { 387 case MRT6_INIT: 388 #ifdef MRT6_OINIT 389 case MRT6_OINIT: 390 #endif 391 error = sooptcopyin(sopt, &optval, sizeof(optval), 392 sizeof(optval)); 393 if (error) 394 break; 395 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 396 break; 397 case MRT6_DONE: 398 error = X_ip6_mrouter_done(); 399 break; 400 case MRT6_ADD_MIF: 401 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 402 if (error) 403 break; 404 error = add_m6if(&mifc); 405 break; 406 case MRT6_ADD_MFC: 407 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 408 if (error) 409 break; 410 error = add_m6fc(&mfcc); 411 break; 412 case MRT6_DEL_MFC: 413 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 414 if (error) 415 break; 416 error = del_m6fc(&mfcc); 417 break; 418 case MRT6_DEL_MIF: 419 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 420 if (error) 421 break; 422 error = del_m6if(&mifi); 423 break; 424 case MRT6_PIM: 425 error = sooptcopyin(sopt, &optval, sizeof(optval), 426 sizeof(optval)); 427 if (error) 428 break; 429 error = set_pim6(&optval); 430 break; 431 default: 432 error = EOPNOTSUPP; 433 break; 434 } 435 436 return (error); 437 } 438 439 /* 440 * Handle MRT getsockopt commands 441 */ 442 int 443 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 444 { 445 int error = 0; 446 447 if (so != V_ip6_mrouter) 448 return (EACCES); 449 450 switch (sopt->sopt_name) { 451 case MRT6_PIM: 452 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 453 break; 454 } 455 return (error); 456 } 457 458 /* 459 * Handle ioctl commands to obtain information from the cache 460 */ 461 int 462 X_mrt6_ioctl(u_long cmd, caddr_t data) 463 { 464 int ret; 465 466 ret = EINVAL; 467 468 switch (cmd) { 469 case SIOCGETSGCNT_IN6: 470 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 471 break; 472 473 case SIOCGETMIFCNT_IN6: 474 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 475 break; 476 477 default: 478 break; 479 } 480 481 return (ret); 482 } 483 484 /* 485 * returns the packet, byte, rpf-failure count for the source group provided 486 */ 487 static int 488 get_sg_cnt(struct sioc_sg_req6 *req) 489 { 490 struct mf6c *rt; 491 int ret; 492 493 ret = 0; 494 495 MFC6_LOCK(); 496 497 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 498 if (rt == NULL) { 499 ret = ESRCH; 500 } else { 501 req->pktcnt = rt->mf6c_pkt_cnt; 502 req->bytecnt = rt->mf6c_byte_cnt; 503 req->wrong_if = rt->mf6c_wrong_if; 504 } 505 506 MFC6_UNLOCK(); 507 508 return (ret); 509 } 510 511 /* 512 * returns the input and output packet and byte counts on the mif provided 513 */ 514 static int 515 get_mif6_cnt(struct sioc_mif_req6 *req) 516 { 517 mifi_t mifi; 518 int ret; 519 520 ret = 0; 521 mifi = req->mifi; 522 523 MIF6_LOCK(); 524 525 if (mifi >= nummifs) { 526 ret = EINVAL; 527 } else { 528 req->icount = mif6table[mifi].m6_pkt_in; 529 req->ocount = mif6table[mifi].m6_pkt_out; 530 req->ibytes = mif6table[mifi].m6_bytes_in; 531 req->obytes = mif6table[mifi].m6_bytes_out; 532 } 533 534 MIF6_UNLOCK(); 535 536 return (ret); 537 } 538 539 static int 540 set_pim6(int *i) 541 { 542 if ((*i != 1) && (*i != 0)) 543 return (EINVAL); 544 545 V_pim6 = *i; 546 547 return (0); 548 } 549 550 /* 551 * Enable multicast routing 552 */ 553 static int 554 ip6_mrouter_init(struct socket *so, int v, int cmd) 555 { 556 557 MRT6_DLOG(DEBUG_ANY, "%s: socket %p", __func__, so); 558 559 if (v != 1) 560 return (ENOPROTOOPT); 561 562 MROUTER6_LOCK(); 563 564 if (V_ip6_mrouter != NULL) { 565 MROUTER6_UNLOCK(); 566 return (EADDRINUSE); 567 } 568 569 V_ip6_mrouter = so; 570 V_ip6_mrouter_ver = cmd; 571 572 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 573 bzero((caddr_t)n6expire, sizeof(n6expire)); 574 575 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 576 577 callout_init_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0); 578 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 579 expire_upcalls, NULL); 580 581 MROUTER6_UNLOCK(); 582 583 MRT6_DLOG(DEBUG_ANY, "finished"); 584 585 return (0); 586 } 587 588 /* 589 * Disable IPv6 multicast forwarding. 590 */ 591 int 592 X_ip6_mrouter_done(void) 593 { 594 mifi_t mifi; 595 u_long i; 596 struct mf6c *rt; 597 struct rtdetq *rte; 598 599 MROUTER6_LOCK(); 600 601 if (V_ip6_mrouter == NULL) { 602 MROUTER6_UNLOCK(); 603 return (EINVAL); 604 } 605 606 /* 607 * For each phyint in use, disable promiscuous reception of all IPv6 608 * multicasts. 609 */ 610 for (mifi = 0; mifi < nummifs; mifi++) { 611 if (mif6table[mifi].m6_ifp && 612 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 613 if_allmulti(mif6table[mifi].m6_ifp, 0); 614 } 615 } 616 bzero((caddr_t)mif6table, sizeof(mif6table)); 617 nummifs = 0; 618 619 V_pim6 = 0; /* used to stub out/in pim specific code */ 620 621 /* 622 * Free all multicast forwarding cache entries. 623 */ 624 MFC6_LOCK(); 625 for (i = 0; i < MF6CTBLSIZ; i++) { 626 rt = mf6ctable[i]; 627 while (rt) { 628 struct mf6c *frt; 629 630 for (rte = rt->mf6c_stall; rte != NULL; ) { 631 struct rtdetq *n = rte->next; 632 633 m_freem(rte->m); 634 free(rte, M_MRTABLE6); 635 rte = n; 636 } 637 frt = rt; 638 rt = rt->mf6c_next; 639 free(frt, M_MRTABLE6); 640 } 641 } 642 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 643 MFC6_UNLOCK(); 644 645 callout_drain(&expire_upcalls_ch); 646 647 /* 648 * Reset register interface 649 */ 650 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 651 if_detach(multicast_register_if6); 652 if_free(multicast_register_if6); 653 reg_mif_num = (mifi_t)-1; 654 multicast_register_if6 = NULL; 655 } 656 657 V_ip6_mrouter = NULL; 658 V_ip6_mrouter_ver = 0; 659 660 MROUTER6_UNLOCK(); 661 MRT6_DLOG(DEBUG_ANY, "finished"); 662 663 return (0); 664 } 665 666 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 667 668 /* 669 * Add a mif to the mif table 670 */ 671 static int 672 add_m6if(struct mif6ctl *mifcp) 673 { 674 struct epoch_tracker et; 675 struct mif6 *mifp; 676 struct ifnet *ifp; 677 int error; 678 679 MIF6_LOCK(); 680 681 if (mifcp->mif6c_mifi >= MAXMIFS) { 682 MIF6_UNLOCK(); 683 return (EINVAL); 684 } 685 mifp = mif6table + mifcp->mif6c_mifi; 686 if (mifp->m6_ifp != NULL) { 687 MIF6_UNLOCK(); 688 return (EADDRINUSE); /* XXX: is it appropriate? */ 689 } 690 691 NET_EPOCH_ENTER(et); 692 if ((ifp = ifnet_byindex(mifcp->mif6c_pifi)) == NULL) { 693 NET_EPOCH_EXIT(et); 694 MIF6_UNLOCK(); 695 return (ENXIO); 696 } 697 NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */ 698 699 if (mifcp->mif6c_flags & MIFF_REGISTER) { 700 if (reg_mif_num == (mifi_t)-1) { 701 ifp = if_alloc(IFT_OTHER); 702 703 if_initname(ifp, "register_mif", 0); 704 ifp->if_flags |= IFF_LOOPBACK; 705 if_attach(ifp); 706 multicast_register_if6 = ifp; 707 reg_mif_num = mifcp->mif6c_mifi; 708 /* 709 * it is impossible to guess the ifindex of the 710 * register interface. So mif6c_pifi is automatically 711 * calculated. 712 */ 713 mifcp->mif6c_pifi = ifp->if_index; 714 } else { 715 ifp = multicast_register_if6; 716 } 717 } else { 718 /* Make sure the interface supports multicast */ 719 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 720 MIF6_UNLOCK(); 721 return (EOPNOTSUPP); 722 } 723 724 error = if_allmulti(ifp, 1); 725 if (error) { 726 MIF6_UNLOCK(); 727 return (error); 728 } 729 } 730 731 mifp->m6_flags = mifcp->mif6c_flags; 732 mifp->m6_ifp = ifp; 733 734 /* initialize per mif pkt counters */ 735 mifp->m6_pkt_in = 0; 736 mifp->m6_pkt_out = 0; 737 mifp->m6_bytes_in = 0; 738 mifp->m6_bytes_out = 0; 739 740 /* Adjust nummifs up if the mifi is higher than nummifs */ 741 if (nummifs <= mifcp->mif6c_mifi) 742 nummifs = mifcp->mif6c_mifi + 1; 743 744 MIF6_UNLOCK(); 745 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 746 if_name(ifp)); 747 748 return (0); 749 } 750 751 /* 752 * Delete a mif from the mif table 753 */ 754 static int 755 del_m6if_locked(mifi_t *mifip) 756 { 757 struct mif6 *mifp = mif6table + *mifip; 758 mifi_t mifi; 759 struct ifnet *ifp; 760 761 MIF6_LOCK_ASSERT(); 762 763 if (*mifip >= nummifs) 764 return (EINVAL); 765 if (mifp->m6_ifp == NULL) 766 return (EINVAL); 767 768 if (!(mifp->m6_flags & MIFF_REGISTER)) { 769 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 770 ifp = mifp->m6_ifp; 771 if_allmulti(ifp, 0); 772 } else { 773 if (reg_mif_num != (mifi_t)-1 && 774 multicast_register_if6 != NULL) { 775 if_detach(multicast_register_if6); 776 if_free(multicast_register_if6); 777 reg_mif_num = (mifi_t)-1; 778 multicast_register_if6 = NULL; 779 } 780 } 781 782 bzero((caddr_t)mifp, sizeof(*mifp)); 783 784 /* Adjust nummifs down */ 785 for (mifi = nummifs; mifi > 0; mifi--) 786 if (mif6table[mifi - 1].m6_ifp) 787 break; 788 nummifs = mifi; 789 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 790 791 return (0); 792 } 793 794 static int 795 del_m6if(mifi_t *mifip) 796 { 797 int cc; 798 799 MIF6_LOCK(); 800 cc = del_m6if_locked(mifip); 801 MIF6_UNLOCK(); 802 803 return (cc); 804 } 805 806 /* 807 * Add an mfc entry 808 */ 809 static int 810 add_m6fc(struct mf6cctl *mfccp) 811 { 812 struct mf6c *rt; 813 u_long hash; 814 struct rtdetq *rte; 815 u_short nstl; 816 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 817 818 MFC6_LOCK(); 819 820 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 821 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 822 823 /* If an entry already exists, just update the fields */ 824 if (rt) { 825 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 826 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 827 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 828 mfccp->mf6cc_parent); 829 830 rt->mf6c_parent = mfccp->mf6cc_parent; 831 rt->mf6c_ifset = mfccp->mf6cc_ifset; 832 833 MFC6_UNLOCK(); 834 return (0); 835 } 836 837 /* 838 * Find the entry for which the upcall was made and update 839 */ 840 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 841 mfccp->mf6cc_mcastgrp.sin6_addr); 842 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 843 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 844 &mfccp->mf6cc_origin.sin6_addr) && 845 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 846 &mfccp->mf6cc_mcastgrp.sin6_addr) && 847 (rt->mf6c_stall != NULL)) { 848 if (nstl++) 849 log(LOG_ERR, 850 "add_m6fc: %s o %s g %s p %x dbx %p\n", 851 "multiple kernel entries", 852 ip6_sprintf(ip6bufo, 853 &mfccp->mf6cc_origin.sin6_addr), 854 ip6_sprintf(ip6bufg, 855 &mfccp->mf6cc_mcastgrp.sin6_addr), 856 mfccp->mf6cc_parent, rt->mf6c_stall); 857 858 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 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 rt->mf6c_origin = mfccp->mf6cc_origin; 866 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 867 rt->mf6c_parent = mfccp->mf6cc_parent; 868 rt->mf6c_ifset = mfccp->mf6cc_ifset; 869 /* initialize pkt counters per src-grp */ 870 rt->mf6c_pkt_cnt = 0; 871 rt->mf6c_byte_cnt = 0; 872 rt->mf6c_wrong_if = 0; 873 874 rt->mf6c_expire = 0; /* Don't clean this guy up */ 875 n6expire[hash]--; 876 877 /* free packets Qed at the end of this entry */ 878 for (rte = rt->mf6c_stall; rte != NULL; ) { 879 struct rtdetq *n = rte->next; 880 ip6_mdq(rte->m, rte->ifp, rt); 881 m_freem(rte->m); 882 #ifdef UPCALL_TIMING 883 collate(&(rte->t)); 884 #endif /* UPCALL_TIMING */ 885 free(rte, M_MRTABLE6); 886 rte = n; 887 } 888 rt->mf6c_stall = NULL; 889 } 890 } 891 892 /* 893 * It is possible that an entry is being inserted without an upcall 894 */ 895 if (nstl == 0) { 896 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 897 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 898 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 899 mfccp->mf6cc_parent); 900 901 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 902 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 903 &mfccp->mf6cc_origin.sin6_addr)&& 904 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 905 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 906 rt->mf6c_origin = mfccp->mf6cc_origin; 907 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 908 rt->mf6c_parent = mfccp->mf6cc_parent; 909 rt->mf6c_ifset = mfccp->mf6cc_ifset; 910 /* initialize pkt counters per src-grp */ 911 rt->mf6c_pkt_cnt = 0; 912 rt->mf6c_byte_cnt = 0; 913 rt->mf6c_wrong_if = 0; 914 915 if (rt->mf6c_expire) 916 n6expire[hash]--; 917 rt->mf6c_expire = 0; 918 } 919 } 920 if (rt == NULL) { 921 /* no upcall, so make a new entry */ 922 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 923 M_NOWAIT); 924 if (rt == NULL) { 925 MFC6_UNLOCK(); 926 return (ENOBUFS); 927 } 928 929 /* insert new entry at head of hash chain */ 930 rt->mf6c_origin = mfccp->mf6cc_origin; 931 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 932 rt->mf6c_parent = mfccp->mf6cc_parent; 933 rt->mf6c_ifset = mfccp->mf6cc_ifset; 934 /* initialize pkt counters per src-grp */ 935 rt->mf6c_pkt_cnt = 0; 936 rt->mf6c_byte_cnt = 0; 937 rt->mf6c_wrong_if = 0; 938 rt->mf6c_expire = 0; 939 rt->mf6c_stall = NULL; 940 941 /* link into table */ 942 rt->mf6c_next = mf6ctable[hash]; 943 mf6ctable[hash] = rt; 944 } 945 } 946 947 MFC6_UNLOCK(); 948 return (0); 949 } 950 951 #ifdef UPCALL_TIMING 952 /* 953 * collect delay statistics on the upcalls 954 */ 955 static void 956 collate(struct timeval *t) 957 { 958 u_long d; 959 struct timeval tp; 960 u_long delta; 961 962 GET_TIME(tp); 963 964 if (TV_LT(*t, tp)) 965 { 966 TV_DELTA(tp, *t, delta); 967 968 d = delta >> 10; 969 if (d > UPCALL_MAX) 970 d = UPCALL_MAX; 971 972 ++upcall_data[d]; 973 } 974 } 975 #endif /* UPCALL_TIMING */ 976 977 /* 978 * Delete an mfc entry 979 */ 980 static int 981 del_m6fc(struct mf6cctl *mfccp) 982 { 983 #ifdef MRT6DEBUG 984 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 985 #endif 986 struct sockaddr_in6 origin; 987 struct sockaddr_in6 mcastgrp; 988 struct mf6c *rt; 989 struct mf6c **nptr; 990 u_long hash; 991 992 origin = mfccp->mf6cc_origin; 993 mcastgrp = mfccp->mf6cc_mcastgrp; 994 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 995 996 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 997 ip6_sprintf(ip6bufo, &origin.sin6_addr), 998 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 999 1000 MFC6_LOCK(); 1001 1002 nptr = &mf6ctable[hash]; 1003 while ((rt = *nptr) != NULL) { 1004 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1005 &rt->mf6c_origin.sin6_addr) && 1006 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1007 &rt->mf6c_mcastgrp.sin6_addr) && 1008 rt->mf6c_stall == NULL) 1009 break; 1010 1011 nptr = &rt->mf6c_next; 1012 } 1013 if (rt == NULL) { 1014 MFC6_UNLOCK(); 1015 return (EADDRNOTAVAIL); 1016 } 1017 1018 *nptr = rt->mf6c_next; 1019 free(rt, M_MRTABLE6); 1020 1021 MFC6_UNLOCK(); 1022 1023 return (0); 1024 } 1025 1026 static int 1027 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1028 { 1029 1030 if (s) { 1031 if (sbappendaddr(&s->so_rcv, 1032 (struct sockaddr *)src, 1033 mm, (struct mbuf *)0) != 0) { 1034 sorwakeup(s); 1035 return (0); 1036 } else 1037 soroverflow(s); 1038 } 1039 m_freem(mm); 1040 return (-1); 1041 } 1042 1043 /* 1044 * IPv6 multicast forwarding function. This function assumes that the packet 1045 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1046 * pointed to by "ifp", and the packet is to be relayed to other networks 1047 * that have members of the packet's destination IPv6 multicast group. 1048 * 1049 * The packet is returned unscathed to the caller, unless it is 1050 * erroneous, in which case a non-zero return value tells the caller to 1051 * discard it. 1052 * 1053 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1054 * this function is called in the originating context (i.e., not when 1055 * forwarding a packet from other node). ip6_output(), which is currently the 1056 * only function that calls this function is called in the originating context, 1057 * explicitly ensures this condition. It is caller's responsibility to ensure 1058 * that if this function is called from somewhere else in the originating 1059 * context in the future. 1060 */ 1061 int 1062 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1063 { 1064 struct rtdetq *rte; 1065 struct mbuf *mb0; 1066 struct mf6c *rt; 1067 struct mif6 *mifp; 1068 struct mbuf *mm; 1069 u_long hash; 1070 mifi_t mifi; 1071 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1072 #ifdef UPCALL_TIMING 1073 struct timeval tp; 1074 1075 GET_TIME(tp); 1076 #endif /* UPCALL_TIMING */ 1077 1078 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1079 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1080 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1081 1082 /* 1083 * Don't forward a packet with Hop limit of zero or one, 1084 * or a packet destined to a local-only group. 1085 */ 1086 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1087 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1088 return (0); 1089 ip6->ip6_hlim--; 1090 1091 /* 1092 * Source address check: do not forward packets with unspecified 1093 * source. It was discussed in July 2000, on ipngwg mailing list. 1094 * This is rather more serious than unicast cases, because some 1095 * MLD packets can be sent with the unspecified source address 1096 * (although such packets must normally set 1 to the hop limit field). 1097 */ 1098 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1099 IP6STAT_INC(ip6s_cantforward); 1100 if (V_ip6_log_cannot_forward && ip6_log_ratelimit()) { 1101 log(LOG_DEBUG, 1102 "cannot forward " 1103 "from %s to %s nxt %d received on %s\n", 1104 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1105 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1106 ip6->ip6_nxt, 1107 if_name(m->m_pkthdr.rcvif)); 1108 } 1109 return (0); 1110 } 1111 1112 MFC6_LOCK(); 1113 1114 /* 1115 * Determine forwarding mifs from the forwarding cache table 1116 */ 1117 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1118 MRT6STAT_INC(mrt6s_mfc_lookups); 1119 1120 /* Entry exists, so forward if necessary */ 1121 if (rt) { 1122 MFC6_UNLOCK(); 1123 return (ip6_mdq(m, ifp, rt)); 1124 } 1125 1126 /* 1127 * If we don't have a route for packet's origin, 1128 * Make a copy of the packet & send message to routing daemon. 1129 */ 1130 MRT6STAT_INC(mrt6s_no_route); 1131 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1132 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1133 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1134 1135 /* 1136 * Allocate mbufs early so that we don't do extra work if we 1137 * are just going to fail anyway. 1138 */ 1139 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1140 if (rte == NULL) { 1141 MFC6_UNLOCK(); 1142 return (ENOBUFS); 1143 } 1144 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1145 /* 1146 * Pullup packet header if needed before storing it, 1147 * as other references may modify it in the meantime. 1148 */ 1149 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1150 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1151 if (mb0 == NULL) { 1152 free(rte, M_MRTABLE6); 1153 MFC6_UNLOCK(); 1154 return (ENOBUFS); 1155 } 1156 1157 /* is there an upcall waiting for this packet? */ 1158 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1159 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1160 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1161 &rt->mf6c_origin.sin6_addr) && 1162 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1163 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1164 break; 1165 } 1166 1167 if (rt == NULL) { 1168 struct mrt6msg *im; 1169 #ifdef MRT6_OINIT 1170 struct omrt6msg *oim; 1171 #endif 1172 /* no upcall, so make a new entry */ 1173 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1174 if (rt == NULL) { 1175 free(rte, M_MRTABLE6); 1176 m_freem(mb0); 1177 MFC6_UNLOCK(); 1178 return (ENOBUFS); 1179 } 1180 /* 1181 * Make a copy of the header to send to the user 1182 * level process 1183 */ 1184 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT); 1185 if (mm == NULL) { 1186 free(rte, M_MRTABLE6); 1187 m_freem(mb0); 1188 free(rt, M_MRTABLE6); 1189 MFC6_UNLOCK(); 1190 return (ENOBUFS); 1191 } 1192 1193 /* 1194 * Send message to routing daemon 1195 */ 1196 sin6.sin6_addr = ip6->ip6_src; 1197 im = NULL; 1198 #ifdef MRT6_OINIT 1199 oim = NULL; 1200 #endif 1201 switch (V_ip6_mrouter_ver) { 1202 #ifdef MRT6_OINIT 1203 case MRT6_OINIT: 1204 oim = mtod(mm, struct omrt6msg *); 1205 oim->im6_msgtype = MRT6MSG_NOCACHE; 1206 oim->im6_mbz = 0; 1207 break; 1208 #endif 1209 case MRT6_INIT: 1210 im = mtod(mm, struct mrt6msg *); 1211 im->im6_msgtype = MRT6MSG_NOCACHE; 1212 im->im6_mbz = 0; 1213 break; 1214 default: 1215 free(rte, M_MRTABLE6); 1216 m_freem(mb0); 1217 free(rt, M_MRTABLE6); 1218 MFC6_UNLOCK(); 1219 return (EINVAL); 1220 } 1221 1222 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1223 for (mifp = mif6table, mifi = 0; 1224 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1225 ; 1226 1227 switch (V_ip6_mrouter_ver) { 1228 #ifdef MRT6_OINIT 1229 case MRT6_OINIT: 1230 oim->im6_mif = mifi; 1231 break; 1232 #endif 1233 case MRT6_INIT: 1234 im->im6_mif = mifi; 1235 break; 1236 } 1237 1238 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1239 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1240 "socket queue full\n"); 1241 MRT6STAT_INC(mrt6s_upq_sockfull); 1242 free(rte, M_MRTABLE6); 1243 m_freem(mb0); 1244 free(rt, M_MRTABLE6); 1245 MFC6_UNLOCK(); 1246 return (ENOBUFS); 1247 } 1248 1249 MRT6STAT_INC(mrt6s_upcalls); 1250 1251 /* insert new entry at head of hash chain */ 1252 bzero(rt, sizeof(*rt)); 1253 rt->mf6c_origin.sin6_family = AF_INET6; 1254 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1255 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1256 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1257 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1258 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1259 rt->mf6c_expire = UPCALL_EXPIRE; 1260 n6expire[hash]++; 1261 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1262 1263 /* link into table */ 1264 rt->mf6c_next = mf6ctable[hash]; 1265 mf6ctable[hash] = rt; 1266 /* Add this entry to the end of the queue */ 1267 rt->mf6c_stall = rte; 1268 } else { 1269 /* determine if q has overflowed */ 1270 struct rtdetq **p; 1271 int npkts = 0; 1272 1273 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1274 if (++npkts > MAX_UPQ6) { 1275 MRT6STAT_INC(mrt6s_upq_ovflw); 1276 free(rte, M_MRTABLE6); 1277 m_freem(mb0); 1278 MFC6_UNLOCK(); 1279 return (0); 1280 } 1281 1282 /* Add this entry to the end of the queue */ 1283 *p = rte; 1284 } 1285 1286 rte->next = NULL; 1287 rte->m = mb0; 1288 rte->ifp = ifp; 1289 #ifdef UPCALL_TIMING 1290 rte->t = tp; 1291 #endif /* UPCALL_TIMING */ 1292 1293 MFC6_UNLOCK(); 1294 1295 return (0); 1296 } 1297 1298 /* 1299 * Clean up cache entries if upcalls are not serviced 1300 * Call from the Slow Timeout mechanism, every half second. 1301 */ 1302 static void 1303 expire_upcalls(void *unused) 1304 { 1305 #ifdef MRT6DEBUG 1306 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1307 #endif 1308 struct rtdetq *rte; 1309 struct mf6c *mfc, **nptr; 1310 u_long i; 1311 1312 MFC6_LOCK_ASSERT(); 1313 1314 for (i = 0; i < MF6CTBLSIZ; i++) { 1315 if (n6expire[i] == 0) 1316 continue; 1317 nptr = &mf6ctable[i]; 1318 while ((mfc = *nptr) != NULL) { 1319 rte = mfc->mf6c_stall; 1320 /* 1321 * Skip real cache entries 1322 * Make sure it wasn't marked to not expire (shouldn't happen) 1323 * If it expires now 1324 */ 1325 if (rte != NULL && 1326 mfc->mf6c_expire != 0 && 1327 --mfc->mf6c_expire == 0) { 1328 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1329 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1330 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1331 /* 1332 * drop all the packets 1333 * free the mbuf with the pkt, if, timing info 1334 */ 1335 do { 1336 struct rtdetq *n = rte->next; 1337 m_freem(rte->m); 1338 free(rte, M_MRTABLE6); 1339 rte = n; 1340 } while (rte != NULL); 1341 MRT6STAT_INC(mrt6s_cache_cleanups); 1342 n6expire[i]--; 1343 1344 *nptr = mfc->mf6c_next; 1345 free(mfc, M_MRTABLE6); 1346 } else { 1347 nptr = &mfc->mf6c_next; 1348 } 1349 } 1350 } 1351 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1352 expire_upcalls, NULL); 1353 } 1354 1355 /* 1356 * Packet forwarding routine once entry in the cache is made 1357 */ 1358 static int 1359 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1360 { 1361 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1362 mifi_t mifi, iif; 1363 struct mif6 *mifp; 1364 int plen = m->m_pkthdr.len; 1365 struct in6_addr src0, dst0; /* copies for local work */ 1366 u_int32_t iszone, idzone, oszone, odzone; 1367 int error = 0; 1368 1369 /* 1370 * Don't forward if it didn't arrive from the parent mif 1371 * for its origin. 1372 */ 1373 mifi = rt->mf6c_parent; 1374 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1375 /* came in the wrong interface */ 1376 MRT6_DLOG(DEBUG_FORWARD, 1377 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1378 mifi, mif6table[mifi].m6_ifp->if_index); 1379 MRT6STAT_INC(mrt6s_wrong_if); 1380 rt->mf6c_wrong_if++; 1381 /* 1382 * If we are doing PIM processing, and we are forwarding 1383 * packets on this interface, send a message to the 1384 * routing daemon. 1385 */ 1386 /* have to make sure this is a valid mif */ 1387 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1388 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1389 /* 1390 * Check the M_LOOP flag to avoid an 1391 * unnecessary PIM assert. 1392 * XXX: M_LOOP is an ad-hoc hack... 1393 */ 1394 static struct sockaddr_in6 sin6 = 1395 { sizeof(sin6), AF_INET6 }; 1396 1397 struct mbuf *mm; 1398 struct mrt6msg *im; 1399 #ifdef MRT6_OINIT 1400 struct omrt6msg *oim; 1401 #endif 1402 1403 mm = m_copym(m, 0, sizeof(struct ip6_hdr), 1404 M_NOWAIT); 1405 if (mm && 1406 (!M_WRITABLE(mm) || 1407 mm->m_len < sizeof(struct ip6_hdr))) 1408 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1409 if (mm == NULL) 1410 return (ENOBUFS); 1411 1412 #ifdef MRT6_OINIT 1413 oim = NULL; 1414 #endif 1415 im = NULL; 1416 switch (V_ip6_mrouter_ver) { 1417 #ifdef MRT6_OINIT 1418 case MRT6_OINIT: 1419 oim = mtod(mm, struct omrt6msg *); 1420 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1421 oim->im6_mbz = 0; 1422 break; 1423 #endif 1424 case MRT6_INIT: 1425 im = mtod(mm, struct mrt6msg *); 1426 im->im6_msgtype = MRT6MSG_WRONGMIF; 1427 im->im6_mbz = 0; 1428 break; 1429 default: 1430 m_freem(mm); 1431 return (EINVAL); 1432 } 1433 1434 for (mifp = mif6table, iif = 0; 1435 iif < nummifs && mifp && 1436 mifp->m6_ifp != ifp; 1437 mifp++, iif++) 1438 ; 1439 1440 switch (V_ip6_mrouter_ver) { 1441 #ifdef MRT6_OINIT 1442 case MRT6_OINIT: 1443 oim->im6_mif = iif; 1444 sin6.sin6_addr = oim->im6_src; 1445 break; 1446 #endif 1447 case MRT6_INIT: 1448 im->im6_mif = iif; 1449 sin6.sin6_addr = im->im6_src; 1450 break; 1451 } 1452 1453 MRT6STAT_INC(mrt6s_upcalls); 1454 1455 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1456 MRT6_DLOG(DEBUG_ANY, 1457 "ip6_mrouter socket queue full"); 1458 MRT6STAT_INC(mrt6s_upq_sockfull); 1459 return (ENOBUFS); 1460 } /* if socket Q full */ 1461 } /* if PIM */ 1462 return (0); 1463 } /* if wrong iif */ 1464 1465 /* If I sourced this packet, it counts as output, else it was input. */ 1466 if (m->m_pkthdr.rcvif == NULL) { 1467 /* XXX: is rcvif really NULL when output?? */ 1468 mif6table[mifi].m6_pkt_out++; 1469 mif6table[mifi].m6_bytes_out += plen; 1470 } else { 1471 mif6table[mifi].m6_pkt_in++; 1472 mif6table[mifi].m6_bytes_in += plen; 1473 } 1474 rt->mf6c_pkt_cnt++; 1475 rt->mf6c_byte_cnt += plen; 1476 1477 /* 1478 * For each mif, forward a copy of the packet if there are group 1479 * members downstream on the interface. 1480 */ 1481 src0 = ip6->ip6_src; 1482 dst0 = ip6->ip6_dst; 1483 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1484 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1485 IP6STAT_INC(ip6s_badscope); 1486 return (error); 1487 } 1488 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1489 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1490 /* 1491 * check if the outgoing packet is going to break 1492 * a scope boundary. 1493 * XXX For packets through PIM register tunnel 1494 * interface, we believe a routing daemon. 1495 */ 1496 if (!(mif6table[rt->mf6c_parent].m6_flags & 1497 MIFF_REGISTER) && 1498 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1499 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1500 &oszone) || 1501 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1502 &odzone) || 1503 iszone != oszone || 1504 idzone != odzone) { 1505 IP6STAT_INC(ip6s_badscope); 1506 continue; 1507 } 1508 } 1509 1510 mifp->m6_pkt_out++; 1511 mifp->m6_bytes_out += plen; 1512 if (mifp->m6_flags & MIFF_REGISTER) 1513 register_send(ip6, mifp, m); 1514 else 1515 phyint_send(ip6, mifp, m); 1516 } 1517 } 1518 return (0); 1519 } 1520 1521 static void 1522 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1523 { 1524 #ifdef MRT6DEBUG 1525 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1526 #endif 1527 struct mbuf *mb_copy; 1528 struct ifnet *ifp = mifp->m6_ifp; 1529 int error __unused = 0; 1530 u_long linkmtu; 1531 1532 /* 1533 * Make a new reference to the packet; make sure that 1534 * the IPv6 header is actually copied, not just referenced, 1535 * so that ip6_output() only scribbles on the copy. 1536 */ 1537 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1538 if (mb_copy && 1539 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1540 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1541 if (mb_copy == NULL) { 1542 return; 1543 } 1544 /* set MCAST flag to the outgoing packet */ 1545 mb_copy->m_flags |= M_MCAST; 1546 1547 /* 1548 * If we sourced the packet, call ip6_output since we may devide 1549 * the packet into fragments when the packet is too big for the 1550 * outgoing interface. 1551 * Otherwise, we can simply send the packet to the interface 1552 * sending queue. 1553 */ 1554 if (m->m_pkthdr.rcvif == NULL) { 1555 struct ip6_moptions im6o; 1556 struct epoch_tracker et; 1557 1558 im6o.im6o_multicast_ifp = ifp; 1559 /* XXX: ip6_output will override ip6->ip6_hlim */ 1560 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1561 im6o.im6o_multicast_loop = 1; 1562 NET_EPOCH_ENTER(et); 1563 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1564 NULL, NULL); 1565 NET_EPOCH_EXIT(et); 1566 1567 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1568 (uint16_t)(mifp - mif6table), error); 1569 return; 1570 } 1571 1572 /* 1573 * If configured to loop back multicasts by default, 1574 * loop back a copy now. 1575 */ 1576 if (in6_mcast_loop) 1577 ip6_mloopback(ifp, m); 1578 1579 /* 1580 * Put the packet into the sending queue of the outgoing interface 1581 * if it would fit in the MTU of the interface. 1582 */ 1583 linkmtu = IN6_LINKMTU(ifp); 1584 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1585 struct sockaddr_in6 dst6; 1586 1587 bzero(&dst6, sizeof(dst6)); 1588 dst6.sin6_len = sizeof(struct sockaddr_in6); 1589 dst6.sin6_family = AF_INET6; 1590 dst6.sin6_addr = ip6->ip6_dst; 1591 1592 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1593 /* 1594 * We just call if_output instead of nd6_output here, since 1595 * we need no ND for a multicast forwarded packet...right? 1596 */ 1597 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1598 error = (*ifp->if_output)(ifp, mb_copy, 1599 (struct sockaddr *)&dst6, NULL); 1600 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1601 (uint16_t)(mifp - mif6table), error); 1602 } else { 1603 /* 1604 * pMTU discovery is intentionally disabled by default, since 1605 * various router may notify pMTU in multicast, which can be 1606 * a DDoS to a router 1607 */ 1608 if (V_ip6_mcast_pmtu) 1609 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1610 else { 1611 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1612 "g %s size %d (discarded)", if_name(ifp), 1613 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1614 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1615 mb_copy->m_pkthdr.len); 1616 m_freem(mb_copy); /* simply discard the packet */ 1617 } 1618 } 1619 } 1620 1621 static int 1622 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1623 { 1624 #ifdef MRT6DEBUG 1625 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1626 #endif 1627 struct mbuf *mm; 1628 int i, len = m->m_pkthdr.len; 1629 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1630 struct mrt6msg *im6; 1631 1632 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1633 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1634 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1635 PIM6STAT_INC(pim6s_snd_registers); 1636 1637 /* Make a copy of the packet to send to the user level process. */ 1638 mm = m_gethdr(M_NOWAIT, MT_DATA); 1639 if (mm == NULL) 1640 return (ENOBUFS); 1641 mm->m_data += max_linkhdr; 1642 mm->m_len = sizeof(struct ip6_hdr); 1643 1644 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 1645 m_freem(mm); 1646 return (ENOBUFS); 1647 } 1648 i = MHLEN - M_LEADINGSPACE(mm); 1649 if (i > len) 1650 i = len; 1651 mm = m_pullup(mm, i); 1652 if (mm == NULL) 1653 return (ENOBUFS); 1654 /* TODO: check it! */ 1655 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1656 1657 /* 1658 * Send message to routing daemon 1659 */ 1660 sin6.sin6_addr = ip6->ip6_src; 1661 1662 im6 = mtod(mm, struct mrt6msg *); 1663 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1664 im6->im6_mbz = 0; 1665 1666 im6->im6_mif = mif - mif6table; 1667 1668 /* iif info is not given for reg. encap.n */ 1669 MRT6STAT_INC(mrt6s_upcalls); 1670 1671 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1672 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1673 MRT6STAT_INC(mrt6s_upq_sockfull); 1674 return (ENOBUFS); 1675 } 1676 return (0); 1677 } 1678 1679 /* 1680 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1681 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1682 * into the kernel. 1683 */ 1684 static int 1685 pim6_encapcheck(const struct mbuf *m __unused, int off __unused, 1686 int proto __unused, void *arg __unused) 1687 { 1688 1689 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1690 return (8); /* claim the datagram. */ 1691 } 1692 1693 /* 1694 * PIM sparse mode hook 1695 * Receives the pim control messages, and passes them up to the listening 1696 * socket, using rip6_input. 1697 * The only message processed is the REGISTER pim message; the pim header 1698 * is stripped off, and the inner packet is passed to register_mforward. 1699 */ 1700 static int 1701 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused) 1702 { 1703 struct pim *pim; /* pointer to a pim struct */ 1704 struct ip6_hdr *ip6; 1705 int pimlen; 1706 int minlen; 1707 1708 PIM6STAT_INC(pim6s_rcv_total); 1709 1710 /* 1711 * Validate lengths 1712 */ 1713 pimlen = m->m_pkthdr.len - off; 1714 if (pimlen < PIM_MINLEN) { 1715 PIM6STAT_INC(pim6s_rcv_tooshort); 1716 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1717 m_freem(m); 1718 return (IPPROTO_DONE); 1719 } 1720 1721 /* 1722 * if the packet is at least as big as a REGISTER, go ahead 1723 * and grab the PIM REGISTER header size, to avoid another 1724 * possible m_pullup() later. 1725 * 1726 * PIM_MINLEN == pimhdr + u_int32 == 8 1727 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1728 */ 1729 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1730 1731 /* 1732 * Make sure that the IP6 and PIM headers in contiguous memory, and 1733 * possibly the PIM REGISTER header 1734 */ 1735 if (m->m_len < off + minlen) { 1736 m = m_pullup(m, off + minlen); 1737 if (m == NULL) { 1738 IP6STAT_INC(ip6s_exthdrtoolong); 1739 return (IPPROTO_DONE); 1740 } 1741 } 1742 ip6 = mtod(m, struct ip6_hdr *); 1743 pim = (struct pim *)((caddr_t)ip6 + off); 1744 1745 #define PIM6_CHECKSUM 1746 #ifdef PIM6_CHECKSUM 1747 { 1748 int cksumlen; 1749 1750 /* 1751 * Validate checksum. 1752 * If PIM REGISTER, exclude the data packet 1753 */ 1754 if (pim->pim_type == PIM_REGISTER) 1755 cksumlen = PIM_MINLEN; 1756 else 1757 cksumlen = pimlen; 1758 1759 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1760 PIM6STAT_INC(pim6s_rcv_badsum); 1761 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1762 m_freem(m); 1763 return (IPPROTO_DONE); 1764 } 1765 } 1766 #endif /* PIM_CHECKSUM */ 1767 1768 /* PIM version check */ 1769 if (pim->pim_ver != PIM_VERSION) { 1770 PIM6STAT_INC(pim6s_rcv_badversion); 1771 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1772 "incorrect version %d, expecting %d", 1773 pim->pim_ver, PIM_VERSION); 1774 m_freem(m); 1775 return (IPPROTO_DONE); 1776 } 1777 1778 if (pim->pim_type == PIM_REGISTER) { 1779 /* 1780 * since this is a REGISTER, we'll make a copy of the register 1781 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1782 * routing daemon. 1783 */ 1784 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1785 1786 struct mbuf *mcp; 1787 struct ip6_hdr *eip6; 1788 u_int32_t *reghdr; 1789 #ifdef MRT6DEBUG 1790 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1791 #endif 1792 1793 PIM6STAT_INC(pim6s_rcv_registers); 1794 1795 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1796 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1797 reg_mif_num); 1798 m_freem(m); 1799 return (IPPROTO_DONE); 1800 } 1801 1802 reghdr = (u_int32_t *)(pim + 1); 1803 1804 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1805 goto pim6_input_to_daemon; 1806 1807 /* 1808 * Validate length 1809 */ 1810 if (pimlen < PIM6_REG_MINLEN) { 1811 PIM6STAT_INC(pim6s_rcv_tooshort); 1812 PIM6STAT_INC(pim6s_rcv_badregisters); 1813 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1814 "size too small %d from %s", 1815 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1816 m_freem(m); 1817 return (IPPROTO_DONE); 1818 } 1819 1820 eip6 = (struct ip6_hdr *) (reghdr + 1); 1821 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1822 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1823 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1824 ntohs(eip6->ip6_plen)); 1825 1826 /* verify the version number of the inner packet */ 1827 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1828 PIM6STAT_INC(pim6s_rcv_badregisters); 1829 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1830 "of the inner packet", 1831 (eip6->ip6_vfc & IPV6_VERSION)); 1832 m_freem(m); 1833 return (IPPROTO_DONE); 1834 } 1835 1836 /* verify the inner packet is destined to a mcast group */ 1837 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1838 PIM6STAT_INC(pim6s_rcv_badregisters); 1839 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1840 "is not multicast %s", 1841 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1842 m_freem(m); 1843 return (IPPROTO_DONE); 1844 } 1845 1846 /* 1847 * make a copy of the whole header to pass to the daemon later. 1848 */ 1849 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT); 1850 if (mcp == NULL) { 1851 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1852 "could not copy register head"); 1853 m_freem(m); 1854 return (IPPROTO_DONE); 1855 } 1856 1857 /* 1858 * forward the inner ip6 packet; point m_data at the inner ip6. 1859 */ 1860 m_adj(m, off + PIM_MINLEN); 1861 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1862 "src %s, dst %s, mif %d", 1863 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1864 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1865 1866 if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1867 dst.sin6_family, 0); 1868 1869 /* prepare the register head to send to the mrouting daemon */ 1870 m = mcp; 1871 } 1872 1873 /* 1874 * Pass the PIM message up to the daemon; if it is a register message 1875 * pass the 'head' only up to the daemon. This includes the 1876 * encapsulator ip6 header, pim header, register header and the 1877 * encapsulated ip6 header. 1878 */ 1879 pim6_input_to_daemon: 1880 return (rip6_input(&m, &off, proto)); 1881 } 1882 1883 static int 1884 ip6_mroute_modevent(module_t mod, int type, void *unused) 1885 { 1886 1887 switch (type) { 1888 case MOD_LOAD: 1889 MROUTER6_LOCK_INIT(); 1890 MFC6_LOCK_INIT(); 1891 MIF6_LOCK_INIT(); 1892 1893 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg, 1894 NULL, M_WAITOK); 1895 if (pim6_encap_cookie == NULL) { 1896 printf("ip6_mroute: unable to attach pim6 encap\n"); 1897 MIF6_LOCK_DESTROY(); 1898 MFC6_LOCK_DESTROY(); 1899 MROUTER6_LOCK_DESTROY(); 1900 return (EINVAL); 1901 } 1902 1903 ip6_mforward = X_ip6_mforward; 1904 ip6_mrouter_done = X_ip6_mrouter_done; 1905 ip6_mrouter_get = X_ip6_mrouter_get; 1906 ip6_mrouter_set = X_ip6_mrouter_set; 1907 mrt6_ioctl = X_mrt6_ioctl; 1908 break; 1909 1910 case MOD_UNLOAD: 1911 if (V_ip6_mrouter != NULL) 1912 return EINVAL; 1913 1914 if (pim6_encap_cookie) { 1915 ip6_encap_detach(pim6_encap_cookie); 1916 pim6_encap_cookie = NULL; 1917 } 1918 X_ip6_mrouter_done(); 1919 ip6_mforward = NULL; 1920 ip6_mrouter_done = NULL; 1921 ip6_mrouter_get = NULL; 1922 ip6_mrouter_set = NULL; 1923 mrt6_ioctl = NULL; 1924 1925 MIF6_LOCK_DESTROY(); 1926 MFC6_LOCK_DESTROY(); 1927 MROUTER6_LOCK_DESTROY(); 1928 break; 1929 1930 default: 1931 return (EOPNOTSUPP); 1932 } 1933 1934 return (0); 1935 } 1936 1937 static moduledata_t ip6_mroutemod = { 1938 "ip6_mroute", 1939 ip6_mroute_modevent, 1940 0 1941 }; 1942 1943 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY); 1944