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 sx mrouter6_mtx; 171 #define MROUTER6_LOCKPTR() (&mrouter6_mtx) 172 #define MROUTER6_LOCK() sx_xlock(MROUTER6_LOCKPTR()) 173 #define MROUTER6_UNLOCK() sx_xunlock(MROUTER6_LOCKPTR()) 174 #define MROUTER6_LOCK_ASSERT() sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED 175 #define MROUTER6_LOCK_INIT() sx_init(MROUTER6_LOCKPTR(), "mrouter6") 176 #define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR()) 177 178 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 179 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 180 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 181 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 182 "netinet6/ip6_mroute.h)"); 183 184 static struct mtx mfc6_mtx; 185 #define MFC6_LOCKPTR() (&mfc6_mtx) 186 #define MFC6_LOCK() mtx_lock(MFC6_LOCKPTR()) 187 #define MFC6_UNLOCK() mtx_unlock(MFC6_LOCKPTR()) 188 #define MFC6_LOCK_ASSERT() mtx_assert(MFC6_LOCKPTR(), MA_OWNED) 189 #define MFC6_LOCK_INIT() mtx_init(MFC6_LOCKPTR(), \ 190 "IPv6 multicast forwarding cache", \ 191 NULL, MTX_DEF) 192 #define MFC6_LOCK_DESTROY() mtx_destroy(MFC6_LOCKPTR()) 193 194 static u_char n6expire[MF6CTBLSIZ]; 195 196 static struct mif6 mif6table[MAXMIFS]; 197 static int 198 sysctl_mif6table(SYSCTL_HANDLER_ARGS) 199 { 200 struct mif6_sctl *out; 201 int error; 202 203 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, 204 M_WAITOK | M_ZERO); 205 for (int i = 0; i < MAXMIFS; i++) { 206 out[i].m6_flags = mif6table[i].m6_flags; 207 out[i].m6_rate_limit = mif6table[i].m6_rate_limit; 208 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr; 209 if (mif6table[i].m6_ifp != NULL) 210 out[i].m6_ifp = mif6table[i].m6_ifp->if_index; 211 else 212 out[i].m6_ifp = 0; 213 out[i].m6_pkt_in = mif6table[i].m6_pkt_in; 214 out[i].m6_pkt_out = mif6table[i].m6_pkt_out; 215 out[i].m6_bytes_in = mif6table[i].m6_bytes_in; 216 out[i].m6_bytes_out = mif6table[i].m6_bytes_out; 217 } 218 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS); 219 free(out, M_TEMP); 220 return (error); 221 } 222 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, 223 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 224 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]", 225 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], " 226 "netinet6/ip6_mroute.h)"); 227 228 static struct mtx mif6_mtx; 229 #define MIF6_LOCKPTR() (&mif6_mtx) 230 #define MIF6_LOCK() mtx_lock(MIF6_LOCKPTR()) 231 #define MIF6_UNLOCK() mtx_unlock(MIF6_LOCKPTR()) 232 #define MIF6_LOCK_ASSERT() mtx_assert(MIF6_LOCKPTR(), MA_OWNED) 233 #define MIF6_LOCK_INIT() \ 234 mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF) 235 #define MIF6_LOCK_DESTROY() mtx_destroy(MIF6_LOCKPTR()) 236 237 #ifdef MRT6DEBUG 238 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */ 239 #define V_mrt6debug VNET(mrt6debug) 240 #define DEBUG_MFC 0x02 241 #define DEBUG_FORWARD 0x04 242 #define DEBUG_EXPIRE 0x08 243 #define DEBUG_XMIT 0x10 244 #define DEBUG_REG 0x20 245 #define DEBUG_PIM 0x40 246 #define DEBUG_ERR 0x80 247 #define DEBUG_ANY 0x7f 248 #define MRT6_DLOG(m, fmt, ...) \ 249 if (V_mrt6debug & (m)) \ 250 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 251 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 252 #else 253 #define MRT6_DLOG(m, fmt, ...) 254 #endif 255 256 static void expire_upcalls(void *); 257 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 258 #define UPCALL_EXPIRE 6 /* number of timeouts */ 259 260 /* 261 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 262 */ 263 264 /* 265 * 'Interfaces' associated with decapsulator (so we can tell 266 * packets that went through it from ones that get reflected 267 * by a broken gateway). Different from IPv4 register_if, 268 * these interfaces are linked into the system ifnet list, 269 * because per-interface IPv6 statistics are maintained in 270 * ifp->if_afdata. But it does not have any routes point 271 * to them. I.e., packets can't be sent this way. They 272 * only exist as a placeholder for multicast source 273 * verification. 274 */ 275 static struct ifnet *multicast_register_if6; 276 277 #define ENCAP_HOPS 64 278 279 /* 280 * Private variables. 281 */ 282 static mifi_t nummifs = 0; 283 static mifi_t reg_mif_num = (mifi_t)-1; 284 285 static struct pim6stat pim6stat; 286 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 287 &pim6stat, pim6stat, 288 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 289 290 #define PIM6STAT_INC(name) pim6stat.name += 1 291 VNET_DEFINE_STATIC(int, pim6); 292 #define V_pim6 VNET(pim6) 293 294 /* 295 * Hash function for a source, group entry 296 */ 297 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 298 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 299 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 300 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 301 302 /* 303 * Find a route for a given origin IPv6 address and Multicast group address. 304 */ 305 #define MF6CFIND(o, g, rt) do { \ 306 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 307 rt = NULL; \ 308 while (_rt) { \ 309 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 310 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 311 (_rt->mf6c_stall == NULL)) { \ 312 rt = _rt; \ 313 break; \ 314 } \ 315 _rt = _rt->mf6c_next; \ 316 } \ 317 if (rt == NULL) { \ 318 MRT6STAT_INC(mrt6s_mfc_misses); \ 319 } \ 320 } while (/*CONSTCOND*/ 0) 321 322 /* 323 * Macros to compute elapsed time efficiently 324 * Borrowed from Van Jacobson's scheduling code 325 * XXX: replace with timersub() ? 326 */ 327 #define TV_DELTA(a, b, delta) do { \ 328 int xxs; \ 329 \ 330 delta = (a).tv_usec - (b).tv_usec; \ 331 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 332 switch (xxs) { \ 333 case 2: \ 334 delta += 1000000; \ 335 /* FALLTHROUGH */ \ 336 case 1: \ 337 delta += 1000000; \ 338 break; \ 339 default: \ 340 delta += (1000000 * xxs); \ 341 } \ 342 } \ 343 } while (/*CONSTCOND*/ 0) 344 345 /* XXX: replace with timercmp(a, b, <) ? */ 346 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 347 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 348 349 #ifdef UPCALL_TIMING 350 #define UPCALL_MAX 50 351 static u_long upcall_data[UPCALL_MAX + 1]; 352 static void collate(); 353 #endif /* UPCALL_TIMING */ 354 355 static int ip6_mrouter_init(struct socket *, int, int); 356 static int add_m6fc(struct mf6cctl *); 357 static int add_m6if(struct mif6ctl *); 358 static int del_m6fc(struct mf6cctl *); 359 static int del_m6if(mifi_t *); 360 static int del_m6if_locked(mifi_t *); 361 static int get_mif6_cnt(struct sioc_mif_req6 *); 362 static int get_sg_cnt(struct sioc_sg_req6 *); 363 364 static struct callout expire_upcalls_ch; 365 366 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 367 int X_ip6_mrouter_done(void); 368 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 369 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 370 int X_mrt6_ioctl(u_long, caddr_t); 371 372 /* 373 * Handle MRT setsockopt commands to modify the multicast routing tables. 374 */ 375 int 376 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 377 { 378 int error = 0; 379 int optval; 380 struct mif6ctl mifc; 381 struct mf6cctl mfcc; 382 mifi_t mifi; 383 384 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 385 return (EPERM); 386 387 switch (sopt->sopt_name) { 388 case MRT6_INIT: 389 #ifdef MRT6_OINIT 390 case MRT6_OINIT: 391 #endif 392 error = sooptcopyin(sopt, &optval, sizeof(optval), 393 sizeof(optval)); 394 if (error) 395 break; 396 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 397 break; 398 case MRT6_DONE: 399 error = X_ip6_mrouter_done(); 400 break; 401 case MRT6_ADD_MIF: 402 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 403 if (error) 404 break; 405 error = add_m6if(&mifc); 406 break; 407 case MRT6_ADD_MFC: 408 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 409 if (error) 410 break; 411 error = add_m6fc(&mfcc); 412 break; 413 case MRT6_DEL_MFC: 414 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 415 if (error) 416 break; 417 error = del_m6fc(&mfcc); 418 break; 419 case MRT6_DEL_MIF: 420 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 421 if (error) 422 break; 423 error = del_m6if(&mifi); 424 break; 425 case MRT6_PIM: 426 error = sooptcopyin(sopt, &optval, sizeof(optval), 427 sizeof(optval)); 428 if (error) 429 break; 430 error = set_pim6(&optval); 431 break; 432 default: 433 error = EOPNOTSUPP; 434 break; 435 } 436 437 return (error); 438 } 439 440 /* 441 * Handle MRT getsockopt commands 442 */ 443 int 444 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 445 { 446 int error = 0; 447 448 if (so != V_ip6_mrouter) 449 return (EACCES); 450 451 switch (sopt->sopt_name) { 452 case MRT6_PIM: 453 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 454 break; 455 } 456 return (error); 457 } 458 459 /* 460 * Handle ioctl commands to obtain information from the cache 461 */ 462 int 463 X_mrt6_ioctl(u_long cmd, caddr_t data) 464 { 465 int ret; 466 467 ret = EINVAL; 468 469 switch (cmd) { 470 case SIOCGETSGCNT_IN6: 471 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 472 break; 473 474 case SIOCGETMIFCNT_IN6: 475 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 476 break; 477 478 default: 479 break; 480 } 481 482 return (ret); 483 } 484 485 /* 486 * returns the packet, byte, rpf-failure count for the source group provided 487 */ 488 static int 489 get_sg_cnt(struct sioc_sg_req6 *req) 490 { 491 struct mf6c *rt; 492 int ret; 493 494 ret = 0; 495 496 MFC6_LOCK(); 497 498 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 499 if (rt == NULL) { 500 ret = ESRCH; 501 } else { 502 req->pktcnt = rt->mf6c_pkt_cnt; 503 req->bytecnt = rt->mf6c_byte_cnt; 504 req->wrong_if = rt->mf6c_wrong_if; 505 } 506 507 MFC6_UNLOCK(); 508 509 return (ret); 510 } 511 512 /* 513 * returns the input and output packet and byte counts on the mif provided 514 */ 515 static int 516 get_mif6_cnt(struct sioc_mif_req6 *req) 517 { 518 mifi_t mifi; 519 int ret; 520 521 ret = 0; 522 mifi = req->mifi; 523 524 MIF6_LOCK(); 525 526 if (mifi >= nummifs) { 527 ret = EINVAL; 528 } else { 529 req->icount = mif6table[mifi].m6_pkt_in; 530 req->ocount = mif6table[mifi].m6_pkt_out; 531 req->ibytes = mif6table[mifi].m6_bytes_in; 532 req->obytes = mif6table[mifi].m6_bytes_out; 533 } 534 535 MIF6_UNLOCK(); 536 537 return (ret); 538 } 539 540 static int 541 set_pim6(int *i) 542 { 543 if ((*i != 1) && (*i != 0)) 544 return (EINVAL); 545 546 V_pim6 = *i; 547 548 return (0); 549 } 550 551 /* 552 * Enable multicast routing 553 */ 554 static int 555 ip6_mrouter_init(struct socket *so, int v, int cmd) 556 { 557 558 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 559 so->so_type, so->so_proto->pr_protocol); 560 561 if (so->so_type != SOCK_RAW || 562 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 563 return (EOPNOTSUPP); 564 565 if (v != 1) 566 return (ENOPROTOOPT); 567 568 MROUTER6_LOCK(); 569 570 if (V_ip6_mrouter != NULL) { 571 MROUTER6_UNLOCK(); 572 return (EADDRINUSE); 573 } 574 575 V_ip6_mrouter = so; 576 V_ip6_mrouter_ver = cmd; 577 578 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 579 bzero((caddr_t)n6expire, sizeof(n6expire)); 580 581 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 582 583 callout_init_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0); 584 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 585 expire_upcalls, NULL); 586 587 MROUTER6_UNLOCK(); 588 589 MRT6_DLOG(DEBUG_ANY, "finished"); 590 591 return (0); 592 } 593 594 /* 595 * Disable IPv6 multicast forwarding. 596 */ 597 int 598 X_ip6_mrouter_done(void) 599 { 600 mifi_t mifi; 601 u_long i; 602 struct mf6c *rt; 603 struct rtdetq *rte; 604 605 MROUTER6_LOCK(); 606 607 if (V_ip6_mrouter == NULL) { 608 MROUTER6_UNLOCK(); 609 return (EINVAL); 610 } 611 612 /* 613 * For each phyint in use, disable promiscuous reception of all IPv6 614 * multicasts. 615 */ 616 for (mifi = 0; mifi < nummifs; mifi++) { 617 if (mif6table[mifi].m6_ifp && 618 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 619 if_allmulti(mif6table[mifi].m6_ifp, 0); 620 } 621 } 622 bzero((caddr_t)mif6table, sizeof(mif6table)); 623 nummifs = 0; 624 625 V_pim6 = 0; /* used to stub out/in pim specific code */ 626 627 /* 628 * Free all multicast forwarding cache entries. 629 */ 630 MFC6_LOCK(); 631 for (i = 0; i < MF6CTBLSIZ; i++) { 632 rt = mf6ctable[i]; 633 while (rt) { 634 struct mf6c *frt; 635 636 for (rte = rt->mf6c_stall; rte != NULL; ) { 637 struct rtdetq *n = rte->next; 638 639 m_freem(rte->m); 640 free(rte, M_MRTABLE6); 641 rte = n; 642 } 643 frt = rt; 644 rt = rt->mf6c_next; 645 free(frt, M_MRTABLE6); 646 } 647 } 648 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 649 MFC6_UNLOCK(); 650 651 callout_drain(&expire_upcalls_ch); 652 653 /* 654 * Reset register interface 655 */ 656 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 657 if_detach(multicast_register_if6); 658 if_free(multicast_register_if6); 659 reg_mif_num = (mifi_t)-1; 660 multicast_register_if6 = NULL; 661 } 662 663 V_ip6_mrouter = NULL; 664 V_ip6_mrouter_ver = 0; 665 666 MROUTER6_UNLOCK(); 667 MRT6_DLOG(DEBUG_ANY, "finished"); 668 669 return (0); 670 } 671 672 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 673 674 /* 675 * Add a mif to the mif table 676 */ 677 static int 678 add_m6if(struct mif6ctl *mifcp) 679 { 680 struct mif6 *mifp; 681 struct ifnet *ifp; 682 int error; 683 684 MIF6_LOCK(); 685 686 if (mifcp->mif6c_mifi >= MAXMIFS) { 687 MIF6_UNLOCK(); 688 return (EINVAL); 689 } 690 mifp = mif6table + mifcp->mif6c_mifi; 691 if (mifp->m6_ifp != NULL) { 692 MIF6_UNLOCK(); 693 return (EADDRINUSE); /* XXX: is it appropriate? */ 694 } 695 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 696 MIF6_UNLOCK(); 697 return (ENXIO); 698 } 699 700 ifp = ifnet_byindex(mifcp->mif6c_pifi); 701 702 if (mifcp->mif6c_flags & MIFF_REGISTER) { 703 if (reg_mif_num == (mifi_t)-1) { 704 ifp = if_alloc(IFT_OTHER); 705 706 if_initname(ifp, "register_mif", 0); 707 ifp->if_flags |= IFF_LOOPBACK; 708 if_attach(ifp); 709 multicast_register_if6 = ifp; 710 reg_mif_num = mifcp->mif6c_mifi; 711 /* 712 * it is impossible to guess the ifindex of the 713 * register interface. So mif6c_pifi is automatically 714 * calculated. 715 */ 716 mifcp->mif6c_pifi = ifp->if_index; 717 } else { 718 ifp = multicast_register_if6; 719 } 720 } else { 721 /* Make sure the interface supports multicast */ 722 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 723 MIF6_UNLOCK(); 724 return (EOPNOTSUPP); 725 } 726 727 error = if_allmulti(ifp, 1); 728 if (error) { 729 MIF6_UNLOCK(); 730 return (error); 731 } 732 } 733 734 mifp->m6_flags = mifcp->mif6c_flags; 735 mifp->m6_ifp = ifp; 736 737 /* initialize per mif pkt counters */ 738 mifp->m6_pkt_in = 0; 739 mifp->m6_pkt_out = 0; 740 mifp->m6_bytes_in = 0; 741 mifp->m6_bytes_out = 0; 742 743 /* Adjust nummifs up if the mifi is higher than nummifs */ 744 if (nummifs <= mifcp->mif6c_mifi) 745 nummifs = mifcp->mif6c_mifi + 1; 746 747 MIF6_UNLOCK(); 748 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 749 if_name(ifp)); 750 751 return (0); 752 } 753 754 /* 755 * Delete a mif from the mif table 756 */ 757 static int 758 del_m6if_locked(mifi_t *mifip) 759 { 760 struct mif6 *mifp = mif6table + *mifip; 761 mifi_t mifi; 762 struct ifnet *ifp; 763 764 MIF6_LOCK_ASSERT(); 765 766 if (*mifip >= nummifs) 767 return (EINVAL); 768 if (mifp->m6_ifp == NULL) 769 return (EINVAL); 770 771 if (!(mifp->m6_flags & MIFF_REGISTER)) { 772 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 773 ifp = mifp->m6_ifp; 774 if_allmulti(ifp, 0); 775 } else { 776 if (reg_mif_num != (mifi_t)-1 && 777 multicast_register_if6 != NULL) { 778 if_detach(multicast_register_if6); 779 if_free(multicast_register_if6); 780 reg_mif_num = (mifi_t)-1; 781 multicast_register_if6 = NULL; 782 } 783 } 784 785 bzero((caddr_t)mifp, sizeof(*mifp)); 786 787 /* Adjust nummifs down */ 788 for (mifi = nummifs; mifi > 0; mifi--) 789 if (mif6table[mifi - 1].m6_ifp) 790 break; 791 nummifs = mifi; 792 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 793 794 return (0); 795 } 796 797 static int 798 del_m6if(mifi_t *mifip) 799 { 800 int cc; 801 802 MIF6_LOCK(); 803 cc = del_m6if_locked(mifip); 804 MIF6_UNLOCK(); 805 806 return (cc); 807 } 808 809 /* 810 * Add an mfc entry 811 */ 812 static int 813 add_m6fc(struct mf6cctl *mfccp) 814 { 815 struct mf6c *rt; 816 u_long hash; 817 struct rtdetq *rte; 818 u_short nstl; 819 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 820 821 MFC6_LOCK(); 822 823 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 824 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 825 826 /* If an entry already exists, just update the fields */ 827 if (rt) { 828 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 829 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 830 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 831 mfccp->mf6cc_parent); 832 833 rt->mf6c_parent = mfccp->mf6cc_parent; 834 rt->mf6c_ifset = mfccp->mf6cc_ifset; 835 836 MFC6_UNLOCK(); 837 return (0); 838 } 839 840 /* 841 * Find the entry for which the upcall was made and update 842 */ 843 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 844 mfccp->mf6cc_mcastgrp.sin6_addr); 845 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 846 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 847 &mfccp->mf6cc_origin.sin6_addr) && 848 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 849 &mfccp->mf6cc_mcastgrp.sin6_addr) && 850 (rt->mf6c_stall != NULL)) { 851 if (nstl++) 852 log(LOG_ERR, 853 "add_m6fc: %s o %s g %s p %x dbx %p\n", 854 "multiple kernel entries", 855 ip6_sprintf(ip6bufo, 856 &mfccp->mf6cc_origin.sin6_addr), 857 ip6_sprintf(ip6bufg, 858 &mfccp->mf6cc_mcastgrp.sin6_addr), 859 mfccp->mf6cc_parent, rt->mf6c_stall); 860 861 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 862 ip6_sprintf(ip6bufo, 863 &mfccp->mf6cc_origin.sin6_addr), 864 ip6_sprintf(ip6bufg, 865 &mfccp->mf6cc_mcastgrp.sin6_addr), 866 mfccp->mf6cc_parent, rt->mf6c_stall); 867 868 rt->mf6c_origin = mfccp->mf6cc_origin; 869 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 870 rt->mf6c_parent = mfccp->mf6cc_parent; 871 rt->mf6c_ifset = mfccp->mf6cc_ifset; 872 /* initialize pkt counters per src-grp */ 873 rt->mf6c_pkt_cnt = 0; 874 rt->mf6c_byte_cnt = 0; 875 rt->mf6c_wrong_if = 0; 876 877 rt->mf6c_expire = 0; /* Don't clean this guy up */ 878 n6expire[hash]--; 879 880 /* free packets Qed at the end of this entry */ 881 for (rte = rt->mf6c_stall; rte != NULL; ) { 882 struct rtdetq *n = rte->next; 883 ip6_mdq(rte->m, rte->ifp, rt); 884 m_freem(rte->m); 885 #ifdef UPCALL_TIMING 886 collate(&(rte->t)); 887 #endif /* UPCALL_TIMING */ 888 free(rte, M_MRTABLE6); 889 rte = n; 890 } 891 rt->mf6c_stall = NULL; 892 } 893 } 894 895 /* 896 * It is possible that an entry is being inserted without an upcall 897 */ 898 if (nstl == 0) { 899 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 900 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 901 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 902 mfccp->mf6cc_parent); 903 904 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 905 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 906 &mfccp->mf6cc_origin.sin6_addr)&& 907 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 908 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 909 rt->mf6c_origin = mfccp->mf6cc_origin; 910 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 911 rt->mf6c_parent = mfccp->mf6cc_parent; 912 rt->mf6c_ifset = mfccp->mf6cc_ifset; 913 /* initialize pkt counters per src-grp */ 914 rt->mf6c_pkt_cnt = 0; 915 rt->mf6c_byte_cnt = 0; 916 rt->mf6c_wrong_if = 0; 917 918 if (rt->mf6c_expire) 919 n6expire[hash]--; 920 rt->mf6c_expire = 0; 921 } 922 } 923 if (rt == NULL) { 924 /* no upcall, so make a new entry */ 925 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 926 M_NOWAIT); 927 if (rt == NULL) { 928 MFC6_UNLOCK(); 929 return (ENOBUFS); 930 } 931 932 /* insert new entry at head of hash chain */ 933 rt->mf6c_origin = mfccp->mf6cc_origin; 934 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 935 rt->mf6c_parent = mfccp->mf6cc_parent; 936 rt->mf6c_ifset = mfccp->mf6cc_ifset; 937 /* initialize pkt counters per src-grp */ 938 rt->mf6c_pkt_cnt = 0; 939 rt->mf6c_byte_cnt = 0; 940 rt->mf6c_wrong_if = 0; 941 rt->mf6c_expire = 0; 942 rt->mf6c_stall = NULL; 943 944 /* link into table */ 945 rt->mf6c_next = mf6ctable[hash]; 946 mf6ctable[hash] = rt; 947 } 948 } 949 950 MFC6_UNLOCK(); 951 return (0); 952 } 953 954 #ifdef UPCALL_TIMING 955 /* 956 * collect delay statistics on the upcalls 957 */ 958 static void 959 collate(struct timeval *t) 960 { 961 u_long d; 962 struct timeval tp; 963 u_long delta; 964 965 GET_TIME(tp); 966 967 if (TV_LT(*t, tp)) 968 { 969 TV_DELTA(tp, *t, delta); 970 971 d = delta >> 10; 972 if (d > UPCALL_MAX) 973 d = UPCALL_MAX; 974 975 ++upcall_data[d]; 976 } 977 } 978 #endif /* UPCALL_TIMING */ 979 980 /* 981 * Delete an mfc entry 982 */ 983 static int 984 del_m6fc(struct mf6cctl *mfccp) 985 { 986 #ifdef MRT6DEBUG 987 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 988 #endif 989 struct sockaddr_in6 origin; 990 struct sockaddr_in6 mcastgrp; 991 struct mf6c *rt; 992 struct mf6c **nptr; 993 u_long hash; 994 995 origin = mfccp->mf6cc_origin; 996 mcastgrp = mfccp->mf6cc_mcastgrp; 997 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 998 999 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 1000 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1001 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1002 1003 MFC6_LOCK(); 1004 1005 nptr = &mf6ctable[hash]; 1006 while ((rt = *nptr) != NULL) { 1007 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1008 &rt->mf6c_origin.sin6_addr) && 1009 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1010 &rt->mf6c_mcastgrp.sin6_addr) && 1011 rt->mf6c_stall == NULL) 1012 break; 1013 1014 nptr = &rt->mf6c_next; 1015 } 1016 if (rt == NULL) { 1017 MFC6_UNLOCK(); 1018 return (EADDRNOTAVAIL); 1019 } 1020 1021 *nptr = rt->mf6c_next; 1022 free(rt, M_MRTABLE6); 1023 1024 MFC6_UNLOCK(); 1025 1026 return (0); 1027 } 1028 1029 static int 1030 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1031 { 1032 1033 if (s) { 1034 if (sbappendaddr(&s->so_rcv, 1035 (struct sockaddr *)src, 1036 mm, (struct mbuf *)0) != 0) { 1037 sorwakeup(s); 1038 return (0); 1039 } else 1040 soroverflow(s); 1041 } 1042 m_freem(mm); 1043 return (-1); 1044 } 1045 1046 /* 1047 * IPv6 multicast forwarding function. This function assumes that the packet 1048 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1049 * pointed to by "ifp", and the packet is to be relayed to other networks 1050 * that have members of the packet's destination IPv6 multicast group. 1051 * 1052 * The packet is returned unscathed to the caller, unless it is 1053 * erroneous, in which case a non-zero return value tells the caller to 1054 * discard it. 1055 * 1056 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1057 * this function is called in the originating context (i.e., not when 1058 * forwarding a packet from other node). ip6_output(), which is currently the 1059 * only function that calls this function is called in the originating context, 1060 * explicitly ensures this condition. It is caller's responsibility to ensure 1061 * that if this function is called from somewhere else in the originating 1062 * context in the future. 1063 */ 1064 int 1065 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1066 { 1067 struct rtdetq *rte; 1068 struct mbuf *mb0; 1069 struct mf6c *rt; 1070 struct mif6 *mifp; 1071 struct mbuf *mm; 1072 u_long hash; 1073 mifi_t mifi; 1074 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1075 #ifdef UPCALL_TIMING 1076 struct timeval tp; 1077 1078 GET_TIME(tp); 1079 #endif /* UPCALL_TIMING */ 1080 1081 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1082 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1083 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1084 1085 /* 1086 * Don't forward a packet with Hop limit of zero or one, 1087 * or a packet destined to a local-only group. 1088 */ 1089 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1090 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1091 return (0); 1092 ip6->ip6_hlim--; 1093 1094 /* 1095 * Source address check: do not forward packets with unspecified 1096 * source. It was discussed in July 2000, on ipngwg mailing list. 1097 * This is rather more serious than unicast cases, because some 1098 * MLD packets can be sent with the unspecified source address 1099 * (although such packets must normally set 1 to the hop limit field). 1100 */ 1101 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1102 IP6STAT_INC(ip6s_cantforward); 1103 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1104 V_ip6_log_time = time_uptime; 1105 log(LOG_DEBUG, 1106 "cannot forward " 1107 "from %s to %s nxt %d received on %s\n", 1108 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1109 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1110 ip6->ip6_nxt, 1111 if_name(m->m_pkthdr.rcvif)); 1112 } 1113 return (0); 1114 } 1115 1116 MFC6_LOCK(); 1117 1118 /* 1119 * Determine forwarding mifs from the forwarding cache table 1120 */ 1121 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1122 MRT6STAT_INC(mrt6s_mfc_lookups); 1123 1124 /* Entry exists, so forward if necessary */ 1125 if (rt) { 1126 MFC6_UNLOCK(); 1127 return (ip6_mdq(m, ifp, rt)); 1128 } 1129 1130 /* 1131 * If we don't have a route for packet's origin, 1132 * Make a copy of the packet & send message to routing daemon. 1133 */ 1134 MRT6STAT_INC(mrt6s_no_route); 1135 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1136 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1137 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1138 1139 /* 1140 * Allocate mbufs early so that we don't do extra work if we 1141 * are just going to fail anyway. 1142 */ 1143 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1144 if (rte == NULL) { 1145 MFC6_UNLOCK(); 1146 return (ENOBUFS); 1147 } 1148 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1149 /* 1150 * Pullup packet header if needed before storing it, 1151 * as other references may modify it in the meantime. 1152 */ 1153 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1154 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1155 if (mb0 == NULL) { 1156 free(rte, M_MRTABLE6); 1157 MFC6_UNLOCK(); 1158 return (ENOBUFS); 1159 } 1160 1161 /* is there an upcall waiting for this packet? */ 1162 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1163 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1164 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1165 &rt->mf6c_origin.sin6_addr) && 1166 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1167 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1168 break; 1169 } 1170 1171 if (rt == NULL) { 1172 struct mrt6msg *im; 1173 #ifdef MRT6_OINIT 1174 struct omrt6msg *oim; 1175 #endif 1176 /* no upcall, so make a new entry */ 1177 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1178 if (rt == NULL) { 1179 free(rte, M_MRTABLE6); 1180 m_freem(mb0); 1181 MFC6_UNLOCK(); 1182 return (ENOBUFS); 1183 } 1184 /* 1185 * Make a copy of the header to send to the user 1186 * level process 1187 */ 1188 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT); 1189 if (mm == NULL) { 1190 free(rte, M_MRTABLE6); 1191 m_freem(mb0); 1192 free(rt, M_MRTABLE6); 1193 MFC6_UNLOCK(); 1194 return (ENOBUFS); 1195 } 1196 1197 /* 1198 * Send message to routing daemon 1199 */ 1200 sin6.sin6_addr = ip6->ip6_src; 1201 im = NULL; 1202 #ifdef MRT6_OINIT 1203 oim = NULL; 1204 #endif 1205 switch (V_ip6_mrouter_ver) { 1206 #ifdef MRT6_OINIT 1207 case MRT6_OINIT: 1208 oim = mtod(mm, struct omrt6msg *); 1209 oim->im6_msgtype = MRT6MSG_NOCACHE; 1210 oim->im6_mbz = 0; 1211 break; 1212 #endif 1213 case MRT6_INIT: 1214 im = mtod(mm, struct mrt6msg *); 1215 im->im6_msgtype = MRT6MSG_NOCACHE; 1216 im->im6_mbz = 0; 1217 break; 1218 default: 1219 free(rte, M_MRTABLE6); 1220 m_freem(mb0); 1221 free(rt, M_MRTABLE6); 1222 MFC6_UNLOCK(); 1223 return (EINVAL); 1224 } 1225 1226 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1227 for (mifp = mif6table, mifi = 0; 1228 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1229 ; 1230 1231 switch (V_ip6_mrouter_ver) { 1232 #ifdef MRT6_OINIT 1233 case MRT6_OINIT: 1234 oim->im6_mif = mifi; 1235 break; 1236 #endif 1237 case MRT6_INIT: 1238 im->im6_mif = mifi; 1239 break; 1240 } 1241 1242 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1243 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1244 "socket queue full\n"); 1245 MRT6STAT_INC(mrt6s_upq_sockfull); 1246 free(rte, M_MRTABLE6); 1247 m_freem(mb0); 1248 free(rt, M_MRTABLE6); 1249 MFC6_UNLOCK(); 1250 return (ENOBUFS); 1251 } 1252 1253 MRT6STAT_INC(mrt6s_upcalls); 1254 1255 /* insert new entry at head of hash chain */ 1256 bzero(rt, sizeof(*rt)); 1257 rt->mf6c_origin.sin6_family = AF_INET6; 1258 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1259 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1260 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1261 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1262 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1263 rt->mf6c_expire = UPCALL_EXPIRE; 1264 n6expire[hash]++; 1265 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1266 1267 /* link into table */ 1268 rt->mf6c_next = mf6ctable[hash]; 1269 mf6ctable[hash] = rt; 1270 /* Add this entry to the end of the queue */ 1271 rt->mf6c_stall = rte; 1272 } else { 1273 /* determine if q has overflowed */ 1274 struct rtdetq **p; 1275 int npkts = 0; 1276 1277 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1278 if (++npkts > MAX_UPQ6) { 1279 MRT6STAT_INC(mrt6s_upq_ovflw); 1280 free(rte, M_MRTABLE6); 1281 m_freem(mb0); 1282 MFC6_UNLOCK(); 1283 return (0); 1284 } 1285 1286 /* Add this entry to the end of the queue */ 1287 *p = rte; 1288 } 1289 1290 rte->next = NULL; 1291 rte->m = mb0; 1292 rte->ifp = ifp; 1293 #ifdef UPCALL_TIMING 1294 rte->t = tp; 1295 #endif /* UPCALL_TIMING */ 1296 1297 MFC6_UNLOCK(); 1298 1299 return (0); 1300 } 1301 1302 /* 1303 * Clean up cache entries if upcalls are not serviced 1304 * Call from the Slow Timeout mechanism, every half second. 1305 */ 1306 static void 1307 expire_upcalls(void *unused) 1308 { 1309 #ifdef MRT6DEBUG 1310 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1311 #endif 1312 struct rtdetq *rte; 1313 struct mf6c *mfc, **nptr; 1314 u_long i; 1315 1316 MFC6_LOCK_ASSERT(); 1317 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 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1356 expire_upcalls, NULL); 1357 } 1358 1359 /* 1360 * Packet forwarding routine once entry in the cache is made 1361 */ 1362 static int 1363 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1364 { 1365 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1366 mifi_t mifi, iif; 1367 struct mif6 *mifp; 1368 int plen = m->m_pkthdr.len; 1369 struct in6_addr src0, dst0; /* copies for local work */ 1370 u_int32_t iszone, idzone, oszone, odzone; 1371 int error = 0; 1372 1373 /* 1374 * Don't forward if it didn't arrive from the parent mif 1375 * for its origin. 1376 */ 1377 mifi = rt->mf6c_parent; 1378 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1379 /* came in the wrong interface */ 1380 MRT6_DLOG(DEBUG_FORWARD, 1381 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1382 mifi, mif6table[mifi].m6_ifp->if_index); 1383 MRT6STAT_INC(mrt6s_wrong_if); 1384 rt->mf6c_wrong_if++; 1385 /* 1386 * If we are doing PIM processing, and we are forwarding 1387 * packets on this interface, send a message to the 1388 * routing daemon. 1389 */ 1390 /* have to make sure this is a valid mif */ 1391 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1392 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1393 /* 1394 * Check the M_LOOP flag to avoid an 1395 * unnecessary PIM assert. 1396 * XXX: M_LOOP is an ad-hoc hack... 1397 */ 1398 static struct sockaddr_in6 sin6 = 1399 { sizeof(sin6), AF_INET6 }; 1400 1401 struct mbuf *mm; 1402 struct mrt6msg *im; 1403 #ifdef MRT6_OINIT 1404 struct omrt6msg *oim; 1405 #endif 1406 1407 mm = m_copym(m, 0, sizeof(struct ip6_hdr), 1408 M_NOWAIT); 1409 if (mm && 1410 (!M_WRITABLE(mm) || 1411 mm->m_len < sizeof(struct ip6_hdr))) 1412 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1413 if (mm == NULL) 1414 return (ENOBUFS); 1415 1416 #ifdef MRT6_OINIT 1417 oim = NULL; 1418 #endif 1419 im = NULL; 1420 switch (V_ip6_mrouter_ver) { 1421 #ifdef MRT6_OINIT 1422 case MRT6_OINIT: 1423 oim = mtod(mm, struct omrt6msg *); 1424 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1425 oim->im6_mbz = 0; 1426 break; 1427 #endif 1428 case MRT6_INIT: 1429 im = mtod(mm, struct mrt6msg *); 1430 im->im6_msgtype = MRT6MSG_WRONGMIF; 1431 im->im6_mbz = 0; 1432 break; 1433 default: 1434 m_freem(mm); 1435 return (EINVAL); 1436 } 1437 1438 for (mifp = mif6table, iif = 0; 1439 iif < nummifs && mifp && 1440 mifp->m6_ifp != ifp; 1441 mifp++, iif++) 1442 ; 1443 1444 switch (V_ip6_mrouter_ver) { 1445 #ifdef MRT6_OINIT 1446 case MRT6_OINIT: 1447 oim->im6_mif = iif; 1448 sin6.sin6_addr = oim->im6_src; 1449 break; 1450 #endif 1451 case MRT6_INIT: 1452 im->im6_mif = iif; 1453 sin6.sin6_addr = im->im6_src; 1454 break; 1455 } 1456 1457 MRT6STAT_INC(mrt6s_upcalls); 1458 1459 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1460 MRT6_DLOG(DEBUG_ANY, 1461 "ip6_mrouter socket queue full"); 1462 MRT6STAT_INC(mrt6s_upq_sockfull); 1463 return (ENOBUFS); 1464 } /* if socket Q full */ 1465 } /* if PIM */ 1466 return (0); 1467 } /* if wrong iif */ 1468 1469 /* If I sourced this packet, it counts as output, else it was input. */ 1470 if (m->m_pkthdr.rcvif == NULL) { 1471 /* XXX: is rcvif really NULL when output?? */ 1472 mif6table[mifi].m6_pkt_out++; 1473 mif6table[mifi].m6_bytes_out += plen; 1474 } else { 1475 mif6table[mifi].m6_pkt_in++; 1476 mif6table[mifi].m6_bytes_in += plen; 1477 } 1478 rt->mf6c_pkt_cnt++; 1479 rt->mf6c_byte_cnt += plen; 1480 1481 /* 1482 * For each mif, forward a copy of the packet if there are group 1483 * members downstream on the interface. 1484 */ 1485 src0 = ip6->ip6_src; 1486 dst0 = ip6->ip6_dst; 1487 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1488 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1489 IP6STAT_INC(ip6s_badscope); 1490 return (error); 1491 } 1492 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1493 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1494 /* 1495 * check if the outgoing packet is going to break 1496 * a scope boundary. 1497 * XXX For packets through PIM register tunnel 1498 * interface, we believe a routing daemon. 1499 */ 1500 if (!(mif6table[rt->mf6c_parent].m6_flags & 1501 MIFF_REGISTER) && 1502 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1503 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1504 &oszone) || 1505 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1506 &odzone) || 1507 iszone != oszone || 1508 idzone != odzone) { 1509 IP6STAT_INC(ip6s_badscope); 1510 continue; 1511 } 1512 } 1513 1514 mifp->m6_pkt_out++; 1515 mifp->m6_bytes_out += plen; 1516 if (mifp->m6_flags & MIFF_REGISTER) 1517 register_send(ip6, mifp, m); 1518 else 1519 phyint_send(ip6, mifp, m); 1520 } 1521 } 1522 return (0); 1523 } 1524 1525 static void 1526 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1527 { 1528 #ifdef MRT6DEBUG 1529 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1530 #endif 1531 struct mbuf *mb_copy; 1532 struct ifnet *ifp = mifp->m6_ifp; 1533 int error = 0; 1534 u_long linkmtu; 1535 1536 /* 1537 * Make a new reference to the packet; make sure that 1538 * the IPv6 header is actually copied, not just referenced, 1539 * so that ip6_output() only scribbles on the copy. 1540 */ 1541 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1542 if (mb_copy && 1543 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1544 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1545 if (mb_copy == NULL) { 1546 return; 1547 } 1548 /* set MCAST flag to the outgoing packet */ 1549 mb_copy->m_flags |= M_MCAST; 1550 1551 /* 1552 * If we sourced the packet, call ip6_output since we may devide 1553 * the packet into fragments when the packet is too big for the 1554 * outgoing interface. 1555 * Otherwise, we can simply send the packet to the interface 1556 * sending queue. 1557 */ 1558 if (m->m_pkthdr.rcvif == NULL) { 1559 struct ip6_moptions im6o; 1560 struct epoch_tracker et; 1561 1562 im6o.im6o_multicast_ifp = ifp; 1563 /* XXX: ip6_output will override ip6->ip6_hlim */ 1564 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1565 im6o.im6o_multicast_loop = 1; 1566 NET_EPOCH_ENTER(et); 1567 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1568 NULL, NULL); 1569 NET_EPOCH_EXIT(et); 1570 1571 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1572 (uint16_t)(mifp - mif6table), error); 1573 return; 1574 } 1575 1576 /* 1577 * If configured to loop back multicasts by default, 1578 * loop back a copy now. 1579 */ 1580 if (in6_mcast_loop) 1581 ip6_mloopback(ifp, m); 1582 1583 /* 1584 * Put the packet into the sending queue of the outgoing interface 1585 * if it would fit in the MTU of the interface. 1586 */ 1587 linkmtu = IN6_LINKMTU(ifp); 1588 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1589 struct sockaddr_in6 dst6; 1590 1591 bzero(&dst6, sizeof(dst6)); 1592 dst6.sin6_len = sizeof(struct sockaddr_in6); 1593 dst6.sin6_family = AF_INET6; 1594 dst6.sin6_addr = ip6->ip6_dst; 1595 1596 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1597 /* 1598 * We just call if_output instead of nd6_output here, since 1599 * we need no ND for a multicast forwarded packet...right? 1600 */ 1601 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1602 error = (*ifp->if_output)(ifp, mb_copy, 1603 (struct sockaddr *)&dst6, NULL); 1604 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1605 (uint16_t)(mifp - mif6table), error); 1606 } else { 1607 /* 1608 * pMTU discovery is intentionally disabled by default, since 1609 * various router may notify pMTU in multicast, which can be 1610 * a DDoS to a router 1611 */ 1612 if (V_ip6_mcast_pmtu) 1613 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1614 else { 1615 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1616 "g %s size %d (discarded)", if_name(ifp), 1617 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1618 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1619 mb_copy->m_pkthdr.len); 1620 m_freem(mb_copy); /* simply discard the packet */ 1621 } 1622 } 1623 } 1624 1625 static int 1626 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1627 { 1628 #ifdef MRT6DEBUG 1629 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1630 #endif 1631 struct mbuf *mm; 1632 int i, len = m->m_pkthdr.len; 1633 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1634 struct mrt6msg *im6; 1635 1636 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1637 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1638 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1639 PIM6STAT_INC(pim6s_snd_registers); 1640 1641 /* Make a copy of the packet to send to the user level process. */ 1642 mm = m_gethdr(M_NOWAIT, MT_DATA); 1643 if (mm == NULL) 1644 return (ENOBUFS); 1645 mm->m_data += max_linkhdr; 1646 mm->m_len = sizeof(struct ip6_hdr); 1647 1648 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 1649 m_freem(mm); 1650 return (ENOBUFS); 1651 } 1652 i = MHLEN - M_LEADINGSPACE(mm); 1653 if (i > len) 1654 i = len; 1655 mm = m_pullup(mm, i); 1656 if (mm == NULL) 1657 return (ENOBUFS); 1658 /* TODO: check it! */ 1659 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1660 1661 /* 1662 * Send message to routing daemon 1663 */ 1664 sin6.sin6_addr = ip6->ip6_src; 1665 1666 im6 = mtod(mm, struct mrt6msg *); 1667 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1668 im6->im6_mbz = 0; 1669 1670 im6->im6_mif = mif - mif6table; 1671 1672 /* iif info is not given for reg. encap.n */ 1673 MRT6STAT_INC(mrt6s_upcalls); 1674 1675 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1676 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1677 MRT6STAT_INC(mrt6s_upq_sockfull); 1678 return (ENOBUFS); 1679 } 1680 return (0); 1681 } 1682 1683 /* 1684 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1685 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1686 * into the kernel. 1687 */ 1688 static int 1689 pim6_encapcheck(const struct mbuf *m __unused, int off __unused, 1690 int proto __unused, void *arg __unused) 1691 { 1692 1693 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1694 return (8); /* claim the datagram. */ 1695 } 1696 1697 /* 1698 * PIM sparse mode hook 1699 * Receives the pim control messages, and passes them up to the listening 1700 * socket, using rip6_input. 1701 * The only message processed is the REGISTER pim message; the pim header 1702 * is stripped off, and the inner packet is passed to register_mforward. 1703 */ 1704 static int 1705 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused) 1706 { 1707 struct pim *pim; /* pointer to a pim struct */ 1708 struct ip6_hdr *ip6; 1709 int pimlen; 1710 int minlen; 1711 1712 PIM6STAT_INC(pim6s_rcv_total); 1713 1714 /* 1715 * Validate lengths 1716 */ 1717 pimlen = m->m_pkthdr.len - off; 1718 if (pimlen < PIM_MINLEN) { 1719 PIM6STAT_INC(pim6s_rcv_tooshort); 1720 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1721 m_freem(m); 1722 return (IPPROTO_DONE); 1723 } 1724 1725 /* 1726 * if the packet is at least as big as a REGISTER, go ahead 1727 * and grab the PIM REGISTER header size, to avoid another 1728 * possible m_pullup() later. 1729 * 1730 * PIM_MINLEN == pimhdr + u_int32 == 8 1731 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1732 */ 1733 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1734 1735 /* 1736 * Make sure that the IP6 and PIM headers in contiguous memory, and 1737 * possibly the PIM REGISTER header 1738 */ 1739 if (m->m_len < off + minlen) { 1740 m = m_pullup(m, off + minlen); 1741 if (m == NULL) { 1742 IP6STAT_INC(ip6s_exthdrtoolong); 1743 return (IPPROTO_DONE); 1744 } 1745 } 1746 ip6 = mtod(m, struct ip6_hdr *); 1747 pim = (struct pim *)((caddr_t)ip6 + off); 1748 1749 #define PIM6_CHECKSUM 1750 #ifdef PIM6_CHECKSUM 1751 { 1752 int cksumlen; 1753 1754 /* 1755 * Validate checksum. 1756 * If PIM REGISTER, exclude the data packet 1757 */ 1758 if (pim->pim_type == PIM_REGISTER) 1759 cksumlen = PIM_MINLEN; 1760 else 1761 cksumlen = pimlen; 1762 1763 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1764 PIM6STAT_INC(pim6s_rcv_badsum); 1765 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1766 m_freem(m); 1767 return (IPPROTO_DONE); 1768 } 1769 } 1770 #endif /* PIM_CHECKSUM */ 1771 1772 /* PIM version check */ 1773 if (pim->pim_ver != PIM_VERSION) { 1774 PIM6STAT_INC(pim6s_rcv_badversion); 1775 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1776 "incorrect version %d, expecting %d", 1777 pim->pim_ver, PIM_VERSION); 1778 m_freem(m); 1779 return (IPPROTO_DONE); 1780 } 1781 1782 if (pim->pim_type == PIM_REGISTER) { 1783 /* 1784 * since this is a REGISTER, we'll make a copy of the register 1785 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1786 * routing daemon. 1787 */ 1788 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1789 1790 struct mbuf *mcp; 1791 struct ip6_hdr *eip6; 1792 u_int32_t *reghdr; 1793 int rc; 1794 #ifdef MRT6DEBUG 1795 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1796 #endif 1797 1798 PIM6STAT_INC(pim6s_rcv_registers); 1799 1800 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1801 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1802 reg_mif_num); 1803 m_freem(m); 1804 return (IPPROTO_DONE); 1805 } 1806 1807 reghdr = (u_int32_t *)(pim + 1); 1808 1809 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1810 goto pim6_input_to_daemon; 1811 1812 /* 1813 * Validate length 1814 */ 1815 if (pimlen < PIM6_REG_MINLEN) { 1816 PIM6STAT_INC(pim6s_rcv_tooshort); 1817 PIM6STAT_INC(pim6s_rcv_badregisters); 1818 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1819 "size too small %d from %s", 1820 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1821 m_freem(m); 1822 return (IPPROTO_DONE); 1823 } 1824 1825 eip6 = (struct ip6_hdr *) (reghdr + 1); 1826 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1827 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1828 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1829 ntohs(eip6->ip6_plen)); 1830 1831 /* verify the version number of the inner packet */ 1832 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1833 PIM6STAT_INC(pim6s_rcv_badregisters); 1834 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1835 "of the inner packet", 1836 (eip6->ip6_vfc & IPV6_VERSION)); 1837 m_freem(m); 1838 return (IPPROTO_DONE); 1839 } 1840 1841 /* verify the inner packet is destined to a mcast group */ 1842 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1843 PIM6STAT_INC(pim6s_rcv_badregisters); 1844 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1845 "is not multicast %s", 1846 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1847 m_freem(m); 1848 return (IPPROTO_DONE); 1849 } 1850 1851 /* 1852 * make a copy of the whole header to pass to the daemon later. 1853 */ 1854 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT); 1855 if (mcp == NULL) { 1856 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1857 "could not copy register head"); 1858 m_freem(m); 1859 return (IPPROTO_DONE); 1860 } 1861 1862 /* 1863 * forward the inner ip6 packet; point m_data at the inner ip6. 1864 */ 1865 m_adj(m, off + PIM_MINLEN); 1866 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1867 "src %s, dst %s, mif %d", 1868 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1869 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1870 1871 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1872 dst.sin6_family, 0); 1873 1874 /* prepare the register head to send to the mrouting daemon */ 1875 m = mcp; 1876 } 1877 1878 /* 1879 * Pass the PIM message up to the daemon; if it is a register message 1880 * pass the 'head' only up to the daemon. This includes the 1881 * encapsulator ip6 header, pim header, register header and the 1882 * encapsulated ip6 header. 1883 */ 1884 pim6_input_to_daemon: 1885 return (rip6_input(&m, &off, proto)); 1886 } 1887 1888 static int 1889 ip6_mroute_modevent(module_t mod, int type, void *unused) 1890 { 1891 1892 switch (type) { 1893 case MOD_LOAD: 1894 MROUTER6_LOCK_INIT(); 1895 MFC6_LOCK_INIT(); 1896 MIF6_LOCK_INIT(); 1897 1898 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg, 1899 NULL, M_WAITOK); 1900 if (pim6_encap_cookie == NULL) { 1901 printf("ip6_mroute: unable to attach pim6 encap\n"); 1902 MIF6_LOCK_DESTROY(); 1903 MFC6_LOCK_DESTROY(); 1904 MROUTER6_LOCK_DESTROY(); 1905 return (EINVAL); 1906 } 1907 1908 ip6_mforward = X_ip6_mforward; 1909 ip6_mrouter_done = X_ip6_mrouter_done; 1910 ip6_mrouter_get = X_ip6_mrouter_get; 1911 ip6_mrouter_set = X_ip6_mrouter_set; 1912 mrt6_ioctl = X_mrt6_ioctl; 1913 break; 1914 1915 case MOD_UNLOAD: 1916 if (V_ip6_mrouter != NULL) 1917 return EINVAL; 1918 1919 if (pim6_encap_cookie) { 1920 ip6_encap_detach(pim6_encap_cookie); 1921 pim6_encap_cookie = NULL; 1922 } 1923 X_ip6_mrouter_done(); 1924 ip6_mforward = NULL; 1925 ip6_mrouter_done = NULL; 1926 ip6_mrouter_get = NULL; 1927 ip6_mrouter_set = NULL; 1928 mrt6_ioctl = NULL; 1929 1930 MIF6_LOCK_DESTROY(); 1931 MFC6_LOCK_DESTROY(); 1932 MROUTER6_LOCK_DESTROY(); 1933 break; 1934 1935 default: 1936 return (EOPNOTSUPP); 1937 } 1938 1939 return (0); 1940 } 1941 1942 static moduledata_t ip6_mroutemod = { 1943 "ip6_mroute", 1944 ip6_mroute_modevent, 1945 0 1946 }; 1947 1948 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY); 1949