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sys/netinet6/ip6_mroute.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1989 Stephen Deering 36 * Copyright (c) 1992, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * Stephen Deering of Stanford University. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 67 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp 68 */ 69 70 /* 71 * IP multicast forwarding procedures 72 * 73 * Written by David Waitzman, BBN Labs, August 1988. 74 * Modified by Steve Deering, Stanford, February 1989. 75 * Modified by Mark J. Steiglitz, Stanford, May, 1991 76 * Modified by Van Jacobson, LBL, January 1993 77 * Modified by Ajit Thyagarajan, PARC, August 1993 78 * Modified by Bill Fenner, PARC, April 1994 79 * 80 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 81 */ 82 83 #include <sys/cdefs.h> 84 __FBSDID("$FreeBSD$"); 85 86 #include "opt_inet6.h" 87 88 #include <sys/param.h> 89 #include <sys/callout.h> 90 #include <sys/errno.h> 91 #include <sys/kernel.h> 92 #include <sys/lock.h> 93 #include <sys/malloc.h> 94 #include <sys/mbuf.h> 95 #include <sys/module.h> 96 #include <sys/domain.h> 97 #include <sys/protosw.h> 98 #include <sys/sdt.h> 99 #include <sys/signalvar.h> 100 #include <sys/socket.h> 101 #include <sys/socketvar.h> 102 #include <sys/sockio.h> 103 #include <sys/sx.h> 104 #include <sys/sysctl.h> 105 #include <sys/syslog.h> 106 #include <sys/systm.h> 107 #include <sys/time.h> 108 109 #include <net/if.h> 110 #include <net/if_var.h> 111 #include <net/if_types.h> 112 #include <net/vnet.h> 113 114 #include <netinet/in.h> 115 #include <netinet/in_var.h> 116 #include <netinet/icmp6.h> 117 #include <netinet/ip_encap.h> 118 119 #include <netinet/ip6.h> 120 #include <netinet/in_kdtrace.h> 121 #include <netinet6/ip6_var.h> 122 #include <netinet6/scope6_var.h> 123 #include <netinet6/nd6.h> 124 #include <netinet6/ip6_mroute.h> 125 #include <netinet6/pim6.h> 126 #include <netinet6/pim6_var.h> 127 128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 129 130 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 131 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 132 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 133 static int set_pim6(int *); 134 static int socket_send(struct socket *, struct mbuf *, 135 struct sockaddr_in6 *); 136 137 extern int in6_mcast_loop; 138 extern struct domain inet6domain; 139 140 static const struct encaptab *pim6_encap_cookie; 141 static int pim6_encapcheck(const struct mbuf *, int, int, void *); 142 static int pim6_input(struct mbuf *, int, int, void *); 143 144 static const struct encap_config ipv6_encap_cfg = { 145 .proto = IPPROTO_PIM, 146 .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN, 147 .exact_match = 8, 148 .check = pim6_encapcheck, 149 .input = pim6_input 150 }; 151 152 153 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0; 154 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 155 156 SYSCTL_DECL(_net_inet6); 157 SYSCTL_DECL(_net_inet6_ip6); 158 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 159 160 static struct mrt6stat mrt6stat; 161 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 162 &mrt6stat, mrt6stat, 163 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 164 165 #define MRT6STAT_INC(name) mrt6stat.name += 1 166 #define NO_RTE_FOUND 0x1 167 #define RTE_FOUND 0x2 168 169 static struct mtx mrouter6_mtx; 170 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 171 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 172 #define MROUTER6_LOCK_ASSERT() do { \ 173 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 174 NET_ASSERT_GIANT(); \ 175 } while (0) 176 #define MROUTER6_LOCK_INIT() \ 177 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 178 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 179 180 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 181 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 182 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 183 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 184 "netinet6/ip6_mroute.h)"); 185 186 static struct mtx mfc6_mtx; 187 #define MFC6_LOCK() mtx_lock(&mfc6_mtx) 188 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 189 #define MFC6_LOCK_ASSERT() do { \ 190 mtx_assert(&mfc6_mtx, MA_OWNED); \ 191 NET_ASSERT_GIANT(); \ 192 } while (0) 193 #define MFC6_LOCK_INIT() \ 194 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 195 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 196 197 static u_char n6expire[MF6CTBLSIZ]; 198 199 static struct mif6 mif6table[MAXMIFS]; 200 static int 201 sysctl_mif6table(SYSCTL_HANDLER_ARGS) 202 { 203 struct mif6_sctl *out; 204 int error; 205 206 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, 207 M_WAITOK | M_ZERO); 208 for (int i = 0; i < MAXMIFS; i++) { 209 out[i].m6_flags = mif6table[i].m6_flags; 210 out[i].m6_rate_limit = mif6table[i].m6_rate_limit; 211 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr; 212 if (mif6table[i].m6_ifp != NULL) 213 out[i].m6_ifp = mif6table[i].m6_ifp->if_index; 214 else 215 out[i].m6_ifp = 0; 216 out[i].m6_pkt_in = mif6table[i].m6_pkt_in; 217 out[i].m6_pkt_out = mif6table[i].m6_pkt_out; 218 out[i].m6_bytes_in = mif6table[i].m6_bytes_in; 219 out[i].m6_bytes_out = mif6table[i].m6_bytes_out; 220 } 221 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS); 222 free(out, M_TEMP); 223 return (error); 224 } 225 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, CTLTYPE_OPAQUE | CTLFLAG_RD, 226 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]", 227 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], " 228 "netinet6/ip6_mroute.h)"); 229 230 static struct mtx mif6_mtx; 231 #define MIF6_LOCK() mtx_lock(&mif6_mtx) 232 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 233 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 234 #define MIF6_LOCK_INIT() \ 235 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 236 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 237 238 #ifdef MRT6DEBUG 239 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */ 240 #define V_mrt6debug VNET(mrt6debug) 241 #define DEBUG_MFC 0x02 242 #define DEBUG_FORWARD 0x04 243 #define DEBUG_EXPIRE 0x08 244 #define DEBUG_XMIT 0x10 245 #define DEBUG_REG 0x20 246 #define DEBUG_PIM 0x40 247 #define DEBUG_ERR 0x80 248 #define DEBUG_ANY 0x7f 249 #define MRT6_DLOG(m, fmt, ...) \ 250 if (V_mrt6debug & (m)) \ 251 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 252 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 253 #else 254 #define MRT6_DLOG(m, fmt, ...) 255 #endif 256 257 static void expire_upcalls(void *); 258 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 259 #define UPCALL_EXPIRE 6 /* number of timeouts */ 260 261 /* 262 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 263 */ 264 265 /* 266 * 'Interfaces' associated with decapsulator (so we can tell 267 * packets that went through it from ones that get reflected 268 * by a broken gateway). Different from IPv4 register_if, 269 * these interfaces are linked into the system ifnet list, 270 * because per-interface IPv6 statistics are maintained in 271 * ifp->if_afdata. But it does not have any routes point 272 * to them. I.e., packets can't be sent this way. They 273 * only exist as a placeholder for multicast source 274 * verification. 275 */ 276 static struct ifnet *multicast_register_if6; 277 278 #define ENCAP_HOPS 64 279 280 /* 281 * Private variables. 282 */ 283 static mifi_t nummifs = 0; 284 static mifi_t reg_mif_num = (mifi_t)-1; 285 286 static struct pim6stat pim6stat; 287 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 288 &pim6stat, pim6stat, 289 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 290 291 #define PIM6STAT_INC(name) pim6stat.name += 1 292 VNET_DEFINE_STATIC(int, pim6); 293 #define V_pim6 VNET(pim6) 294 295 /* 296 * Hash function for a source, group entry 297 */ 298 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 299 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 300 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 301 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 302 303 /* 304 * Find a route for a given origin IPv6 address and Multicast group address. 305 */ 306 #define MF6CFIND(o, g, rt) do { \ 307 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 308 rt = NULL; \ 309 while (_rt) { \ 310 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 311 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 312 (_rt->mf6c_stall == NULL)) { \ 313 rt = _rt; \ 314 break; \ 315 } \ 316 _rt = _rt->mf6c_next; \ 317 } \ 318 if (rt == NULL) { \ 319 MRT6STAT_INC(mrt6s_mfc_misses); \ 320 } \ 321 } while (/*CONSTCOND*/ 0) 322 323 /* 324 * Macros to compute elapsed time efficiently 325 * Borrowed from Van Jacobson's scheduling code 326 * XXX: replace with timersub() ? 327 */ 328 #define TV_DELTA(a, b, delta) do { \ 329 int xxs; \ 330 \ 331 delta = (a).tv_usec - (b).tv_usec; \ 332 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 333 switch (xxs) { \ 334 case 2: \ 335 delta += 1000000; \ 336 /* FALLTHROUGH */ \ 337 case 1: \ 338 delta += 1000000; \ 339 break; \ 340 default: \ 341 delta += (1000000 * xxs); \ 342 } \ 343 } \ 344 } while (/*CONSTCOND*/ 0) 345 346 /* XXX: replace with timercmp(a, b, <) ? */ 347 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 348 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 349 350 #ifdef UPCALL_TIMING 351 #define UPCALL_MAX 50 352 static u_long upcall_data[UPCALL_MAX + 1]; 353 static void collate(); 354 #endif /* UPCALL_TIMING */ 355 356 static int ip6_mrouter_init(struct socket *, int, int); 357 static int add_m6fc(struct mf6cctl *); 358 static int add_m6if(struct mif6ctl *); 359 static int del_m6fc(struct mf6cctl *); 360 static int del_m6if(mifi_t *); 361 static int del_m6if_locked(mifi_t *); 362 static int get_mif6_cnt(struct sioc_mif_req6 *); 363 static int get_sg_cnt(struct sioc_sg_req6 *); 364 365 static struct callout expire_upcalls_ch; 366 367 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 368 int X_ip6_mrouter_done(void); 369 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 370 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 371 int X_mrt6_ioctl(u_long, caddr_t); 372 373 /* 374 * Handle MRT setsockopt commands to modify the multicast routing tables. 375 */ 376 int 377 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 378 { 379 int error = 0; 380 int optval; 381 struct mif6ctl mifc; 382 struct mf6cctl mfcc; 383 mifi_t mifi; 384 385 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 386 return (EPERM); 387 388 switch (sopt->sopt_name) { 389 case MRT6_INIT: 390 #ifdef MRT6_OINIT 391 case MRT6_OINIT: 392 #endif 393 error = sooptcopyin(sopt, &optval, sizeof(optval), 394 sizeof(optval)); 395 if (error) 396 break; 397 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 398 break; 399 case MRT6_DONE: 400 error = X_ip6_mrouter_done(); 401 break; 402 case MRT6_ADD_MIF: 403 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 404 if (error) 405 break; 406 error = add_m6if(&mifc); 407 break; 408 case MRT6_ADD_MFC: 409 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 410 if (error) 411 break; 412 error = add_m6fc(&mfcc); 413 break; 414 case MRT6_DEL_MFC: 415 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 416 if (error) 417 break; 418 error = del_m6fc(&mfcc); 419 break; 420 case MRT6_DEL_MIF: 421 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 422 if (error) 423 break; 424 error = del_m6if(&mifi); 425 break; 426 case MRT6_PIM: 427 error = sooptcopyin(sopt, &optval, sizeof(optval), 428 sizeof(optval)); 429 if (error) 430 break; 431 error = set_pim6(&optval); 432 break; 433 default: 434 error = EOPNOTSUPP; 435 break; 436 } 437 438 return (error); 439 } 440 441 /* 442 * Handle MRT getsockopt commands 443 */ 444 int 445 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 446 { 447 int error = 0; 448 449 if (so != V_ip6_mrouter) 450 return (EACCES); 451 452 switch (sopt->sopt_name) { 453 case MRT6_PIM: 454 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 455 break; 456 } 457 return (error); 458 } 459 460 /* 461 * Handle ioctl commands to obtain information from the cache 462 */ 463 int 464 X_mrt6_ioctl(u_long cmd, caddr_t data) 465 { 466 int ret; 467 468 ret = EINVAL; 469 470 switch (cmd) { 471 case SIOCGETSGCNT_IN6: 472 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 473 break; 474 475 case SIOCGETMIFCNT_IN6: 476 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 477 break; 478 479 default: 480 break; 481 } 482 483 return (ret); 484 } 485 486 /* 487 * returns the packet, byte, rpf-failure count for the source group provided 488 */ 489 static int 490 get_sg_cnt(struct sioc_sg_req6 *req) 491 { 492 struct mf6c *rt; 493 int ret; 494 495 ret = 0; 496 497 MFC6_LOCK(); 498 499 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 500 if (rt == NULL) { 501 ret = ESRCH; 502 } else { 503 req->pktcnt = rt->mf6c_pkt_cnt; 504 req->bytecnt = rt->mf6c_byte_cnt; 505 req->wrong_if = rt->mf6c_wrong_if; 506 } 507 508 MFC6_UNLOCK(); 509 510 return (ret); 511 } 512 513 /* 514 * returns the input and output packet and byte counts on the mif provided 515 */ 516 static int 517 get_mif6_cnt(struct sioc_mif_req6 *req) 518 { 519 mifi_t mifi; 520 int ret; 521 522 ret = 0; 523 mifi = req->mifi; 524 525 MIF6_LOCK(); 526 527 if (mifi >= nummifs) { 528 ret = EINVAL; 529 } else { 530 req->icount = mif6table[mifi].m6_pkt_in; 531 req->ocount = mif6table[mifi].m6_pkt_out; 532 req->ibytes = mif6table[mifi].m6_bytes_in; 533 req->obytes = mif6table[mifi].m6_bytes_out; 534 } 535 536 MIF6_UNLOCK(); 537 538 return (ret); 539 } 540 541 static int 542 set_pim6(int *i) 543 { 544 if ((*i != 1) && (*i != 0)) 545 return (EINVAL); 546 547 V_pim6 = *i; 548 549 return (0); 550 } 551 552 /* 553 * Enable multicast routing 554 */ 555 static int 556 ip6_mrouter_init(struct socket *so, int v, int cmd) 557 { 558 559 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 560 so->so_type, so->so_proto->pr_protocol); 561 562 if (so->so_type != SOCK_RAW || 563 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 564 return (EOPNOTSUPP); 565 566 if (v != 1) 567 return (ENOPROTOOPT); 568 569 MROUTER6_LOCK(); 570 571 if (V_ip6_mrouter != NULL) { 572 MROUTER6_UNLOCK(); 573 return (EADDRINUSE); 574 } 575 576 V_ip6_mrouter = so; 577 V_ip6_mrouter_ver = cmd; 578 579 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 580 bzero((caddr_t)n6expire, sizeof(n6expire)); 581 582 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 583 584 callout_init(&expire_upcalls_ch, 0); 585 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 586 expire_upcalls, NULL); 587 588 MROUTER6_UNLOCK(); 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 callout_stop(&expire_upcalls_ch); 628 629 /* 630 * Free all multicast forwarding cache entries. 631 */ 632 MFC6_LOCK(); 633 for (i = 0; i < MF6CTBLSIZ; i++) { 634 rt = mf6ctable[i]; 635 while (rt) { 636 struct mf6c *frt; 637 638 for (rte = rt->mf6c_stall; rte != NULL; ) { 639 struct rtdetq *n = rte->next; 640 641 m_freem(rte->m); 642 free(rte, M_MRTABLE6); 643 rte = n; 644 } 645 frt = rt; 646 rt = rt->mf6c_next; 647 free(frt, M_MRTABLE6); 648 } 649 } 650 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 651 MFC6_UNLOCK(); 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)) { 851 852 if (nstl++) 853 log(LOG_ERR, 854 "add_m6fc: %s o %s g %s p %x dbx %p\n", 855 "multiple kernel entries", 856 ip6_sprintf(ip6bufo, 857 &mfccp->mf6cc_origin.sin6_addr), 858 ip6_sprintf(ip6bufg, 859 &mfccp->mf6cc_mcastgrp.sin6_addr), 860 mfccp->mf6cc_parent, rt->mf6c_stall); 861 862 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 863 ip6_sprintf(ip6bufo, 864 &mfccp->mf6cc_origin.sin6_addr), 865 ip6_sprintf(ip6bufg, 866 &mfccp->mf6cc_mcastgrp.sin6_addr), 867 mfccp->mf6cc_parent, rt->mf6c_stall); 868 869 rt->mf6c_origin = mfccp->mf6cc_origin; 870 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 871 rt->mf6c_parent = mfccp->mf6cc_parent; 872 rt->mf6c_ifset = mfccp->mf6cc_ifset; 873 /* initialize pkt counters per src-grp */ 874 rt->mf6c_pkt_cnt = 0; 875 rt->mf6c_byte_cnt = 0; 876 rt->mf6c_wrong_if = 0; 877 878 rt->mf6c_expire = 0; /* Don't clean this guy up */ 879 n6expire[hash]--; 880 881 /* free packets Qed at the end of this entry */ 882 for (rte = rt->mf6c_stall; rte != NULL; ) { 883 struct rtdetq *n = rte->next; 884 ip6_mdq(rte->m, rte->ifp, rt); 885 m_freem(rte->m); 886 #ifdef UPCALL_TIMING 887 collate(&(rte->t)); 888 #endif /* UPCALL_TIMING */ 889 free(rte, M_MRTABLE6); 890 rte = n; 891 } 892 rt->mf6c_stall = NULL; 893 } 894 } 895 896 /* 897 * It is possible that an entry is being inserted without an upcall 898 */ 899 if (nstl == 0) { 900 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 901 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 902 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 903 mfccp->mf6cc_parent); 904 905 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 906 907 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 908 &mfccp->mf6cc_origin.sin6_addr)&& 909 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 910 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 911 912 rt->mf6c_origin = mfccp->mf6cc_origin; 913 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 914 rt->mf6c_parent = mfccp->mf6cc_parent; 915 rt->mf6c_ifset = mfccp->mf6cc_ifset; 916 /* initialize pkt counters per src-grp */ 917 rt->mf6c_pkt_cnt = 0; 918 rt->mf6c_byte_cnt = 0; 919 rt->mf6c_wrong_if = 0; 920 921 if (rt->mf6c_expire) 922 n6expire[hash]--; 923 rt->mf6c_expire = 0; 924 } 925 } 926 if (rt == NULL) { 927 /* no upcall, so make a new entry */ 928 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 929 M_NOWAIT); 930 if (rt == NULL) { 931 MFC6_UNLOCK(); 932 return (ENOBUFS); 933 } 934 935 /* insert new entry at head of hash chain */ 936 rt->mf6c_origin = mfccp->mf6cc_origin; 937 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 938 rt->mf6c_parent = mfccp->mf6cc_parent; 939 rt->mf6c_ifset = mfccp->mf6cc_ifset; 940 /* initialize pkt counters per src-grp */ 941 rt->mf6c_pkt_cnt = 0; 942 rt->mf6c_byte_cnt = 0; 943 rt->mf6c_wrong_if = 0; 944 rt->mf6c_expire = 0; 945 rt->mf6c_stall = NULL; 946 947 /* link into table */ 948 rt->mf6c_next = mf6ctable[hash]; 949 mf6ctable[hash] = rt; 950 } 951 } 952 953 MFC6_UNLOCK(); 954 return (0); 955 } 956 957 #ifdef UPCALL_TIMING 958 /* 959 * collect delay statistics on the upcalls 960 */ 961 static void 962 collate(struct timeval *t) 963 { 964 u_long d; 965 struct timeval tp; 966 u_long delta; 967 968 GET_TIME(tp); 969 970 if (TV_LT(*t, tp)) 971 { 972 TV_DELTA(tp, *t, delta); 973 974 d = delta >> 10; 975 if (d > UPCALL_MAX) 976 d = UPCALL_MAX; 977 978 ++upcall_data[d]; 979 } 980 } 981 #endif /* UPCALL_TIMING */ 982 983 /* 984 * Delete an mfc entry 985 */ 986 static int 987 del_m6fc(struct mf6cctl *mfccp) 988 { 989 #ifdef MRT6DEBUG 990 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 991 #endif 992 struct sockaddr_in6 origin; 993 struct sockaddr_in6 mcastgrp; 994 struct mf6c *rt; 995 struct mf6c **nptr; 996 u_long hash; 997 998 origin = mfccp->mf6cc_origin; 999 mcastgrp = mfccp->mf6cc_mcastgrp; 1000 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1001 1002 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 1003 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1004 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1005 1006 MFC6_LOCK(); 1007 1008 nptr = &mf6ctable[hash]; 1009 while ((rt = *nptr) != NULL) { 1010 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1011 &rt->mf6c_origin.sin6_addr) && 1012 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1013 &rt->mf6c_mcastgrp.sin6_addr) && 1014 rt->mf6c_stall == NULL) 1015 break; 1016 1017 nptr = &rt->mf6c_next; 1018 } 1019 if (rt == NULL) { 1020 MFC6_UNLOCK(); 1021 return (EADDRNOTAVAIL); 1022 } 1023 1024 *nptr = rt->mf6c_next; 1025 free(rt, M_MRTABLE6); 1026 1027 MFC6_UNLOCK(); 1028 1029 return (0); 1030 } 1031 1032 static int 1033 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1034 { 1035 1036 if (s) { 1037 if (sbappendaddr(&s->so_rcv, 1038 (struct sockaddr *)src, 1039 mm, (struct mbuf *)0) != 0) { 1040 sorwakeup(s); 1041 return (0); 1042 } else 1043 soroverflow(s); 1044 } 1045 m_freem(mm); 1046 return (-1); 1047 } 1048 1049 /* 1050 * IPv6 multicast forwarding function. This function assumes that the packet 1051 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1052 * pointed to by "ifp", and the packet is to be relayed to other networks 1053 * that have members of the packet's destination IPv6 multicast group. 1054 * 1055 * The packet is returned unscathed to the caller, unless it is 1056 * erroneous, in which case a non-zero return value tells the caller to 1057 * discard it. 1058 * 1059 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1060 * this function is called in the originating context (i.e., not when 1061 * forwarding a packet from other node). ip6_output(), which is currently the 1062 * only function that calls this function is called in the originating context, 1063 * explicitly ensures this condition. It is caller's responsibility to ensure 1064 * that if this function is called from somewhere else in the originating 1065 * context in the future. 1066 */ 1067 int 1068 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1069 { 1070 struct rtdetq *rte; 1071 struct mbuf *mb0; 1072 struct mf6c *rt; 1073 struct mif6 *mifp; 1074 struct mbuf *mm; 1075 u_long hash; 1076 mifi_t mifi; 1077 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1078 #ifdef UPCALL_TIMING 1079 struct timeval tp; 1080 1081 GET_TIME(tp); 1082 #endif /* UPCALL_TIMING */ 1083 1084 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1085 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1086 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1087 1088 /* 1089 * Don't forward a packet with Hop limit of zero or one, 1090 * or a packet destined to a local-only group. 1091 */ 1092 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1093 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1094 return (0); 1095 ip6->ip6_hlim--; 1096 1097 /* 1098 * Source address check: do not forward packets with unspecified 1099 * source. It was discussed in July 2000, on ipngwg mailing list. 1100 * This is rather more serious than unicast cases, because some 1101 * MLD packets can be sent with the unspecified source address 1102 * (although such packets must normally set 1 to the hop limit field). 1103 */ 1104 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1105 IP6STAT_INC(ip6s_cantforward); 1106 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1107 V_ip6_log_time = time_uptime; 1108 log(LOG_DEBUG, 1109 "cannot forward " 1110 "from %s to %s nxt %d received on %s\n", 1111 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1112 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1113 ip6->ip6_nxt, 1114 if_name(m->m_pkthdr.rcvif)); 1115 } 1116 return (0); 1117 } 1118 1119 MFC6_LOCK(); 1120 1121 /* 1122 * Determine forwarding mifs from the forwarding cache table 1123 */ 1124 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1125 MRT6STAT_INC(mrt6s_mfc_lookups); 1126 1127 /* Entry exists, so forward if necessary */ 1128 if (rt) { 1129 MFC6_UNLOCK(); 1130 return (ip6_mdq(m, ifp, rt)); 1131 } 1132 1133 /* 1134 * If we don't have a route for packet's origin, 1135 * Make a copy of the packet & send message to routing daemon. 1136 */ 1137 MRT6STAT_INC(mrt6s_no_route); 1138 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1139 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1140 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1141 1142 /* 1143 * Allocate mbufs early so that we don't do extra work if we 1144 * are just going to fail anyway. 1145 */ 1146 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1147 if (rte == NULL) { 1148 MFC6_UNLOCK(); 1149 return (ENOBUFS); 1150 } 1151 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1152 /* 1153 * Pullup packet header if needed before storing it, 1154 * as other references may modify it in the meantime. 1155 */ 1156 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1157 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1158 if (mb0 == NULL) { 1159 free(rte, M_MRTABLE6); 1160 MFC6_UNLOCK(); 1161 return (ENOBUFS); 1162 } 1163 1164 /* is there an upcall waiting for this packet? */ 1165 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1166 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1167 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1168 &rt->mf6c_origin.sin6_addr) && 1169 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1170 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1171 break; 1172 } 1173 1174 if (rt == NULL) { 1175 struct mrt6msg *im; 1176 #ifdef MRT6_OINIT 1177 struct omrt6msg *oim; 1178 #endif 1179 /* no upcall, so make a new entry */ 1180 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1181 if (rt == NULL) { 1182 free(rte, M_MRTABLE6); 1183 m_freem(mb0); 1184 MFC6_UNLOCK(); 1185 return (ENOBUFS); 1186 } 1187 /* 1188 * Make a copy of the header to send to the user 1189 * level process 1190 */ 1191 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT); 1192 if (mm == NULL) { 1193 free(rte, M_MRTABLE6); 1194 m_freem(mb0); 1195 free(rt, M_MRTABLE6); 1196 MFC6_UNLOCK(); 1197 return (ENOBUFS); 1198 } 1199 1200 /* 1201 * Send message to routing daemon 1202 */ 1203 sin6.sin6_addr = ip6->ip6_src; 1204 im = NULL; 1205 #ifdef MRT6_OINIT 1206 oim = NULL; 1207 #endif 1208 switch (V_ip6_mrouter_ver) { 1209 #ifdef MRT6_OINIT 1210 case MRT6_OINIT: 1211 oim = mtod(mm, struct omrt6msg *); 1212 oim->im6_msgtype = MRT6MSG_NOCACHE; 1213 oim->im6_mbz = 0; 1214 break; 1215 #endif 1216 case MRT6_INIT: 1217 im = mtod(mm, struct mrt6msg *); 1218 im->im6_msgtype = MRT6MSG_NOCACHE; 1219 im->im6_mbz = 0; 1220 break; 1221 default: 1222 free(rte, M_MRTABLE6); 1223 m_freem(mb0); 1224 free(rt, M_MRTABLE6); 1225 MFC6_UNLOCK(); 1226 return (EINVAL); 1227 } 1228 1229 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1230 for (mifp = mif6table, mifi = 0; 1231 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1232 ; 1233 1234 switch (V_ip6_mrouter_ver) { 1235 #ifdef MRT6_OINIT 1236 case MRT6_OINIT: 1237 oim->im6_mif = mifi; 1238 break; 1239 #endif 1240 case MRT6_INIT: 1241 im->im6_mif = mifi; 1242 break; 1243 } 1244 1245 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1246 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1247 "socket queue full\n"); 1248 MRT6STAT_INC(mrt6s_upq_sockfull); 1249 free(rte, M_MRTABLE6); 1250 m_freem(mb0); 1251 free(rt, M_MRTABLE6); 1252 MFC6_UNLOCK(); 1253 return (ENOBUFS); 1254 } 1255 1256 MRT6STAT_INC(mrt6s_upcalls); 1257 1258 /* insert new entry at head of hash chain */ 1259 bzero(rt, sizeof(*rt)); 1260 rt->mf6c_origin.sin6_family = AF_INET6; 1261 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1262 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1263 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1264 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1265 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1266 rt->mf6c_expire = UPCALL_EXPIRE; 1267 n6expire[hash]++; 1268 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1269 1270 /* link into table */ 1271 rt->mf6c_next = mf6ctable[hash]; 1272 mf6ctable[hash] = rt; 1273 /* Add this entry to the end of the queue */ 1274 rt->mf6c_stall = rte; 1275 } else { 1276 /* determine if q has overflowed */ 1277 struct rtdetq **p; 1278 int npkts = 0; 1279 1280 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1281 if (++npkts > MAX_UPQ6) { 1282 MRT6STAT_INC(mrt6s_upq_ovflw); 1283 free(rte, M_MRTABLE6); 1284 m_freem(mb0); 1285 MFC6_UNLOCK(); 1286 return (0); 1287 } 1288 1289 /* Add this entry to the end of the queue */ 1290 *p = rte; 1291 } 1292 1293 rte->next = NULL; 1294 rte->m = mb0; 1295 rte->ifp = ifp; 1296 #ifdef UPCALL_TIMING 1297 rte->t = tp; 1298 #endif /* UPCALL_TIMING */ 1299 1300 MFC6_UNLOCK(); 1301 1302 return (0); 1303 } 1304 1305 /* 1306 * Clean up cache entries if upcalls are not serviced 1307 * Call from the Slow Timeout mechanism, every half second. 1308 */ 1309 static void 1310 expire_upcalls(void *unused) 1311 { 1312 #ifdef MRT6DEBUG 1313 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1314 #endif 1315 struct rtdetq *rte; 1316 struct mf6c *mfc, **nptr; 1317 u_long i; 1318 1319 MFC6_LOCK(); 1320 for (i = 0; i < MF6CTBLSIZ; i++) { 1321 if (n6expire[i] == 0) 1322 continue; 1323 nptr = &mf6ctable[i]; 1324 while ((mfc = *nptr) != NULL) { 1325 rte = mfc->mf6c_stall; 1326 /* 1327 * Skip real cache entries 1328 * Make sure it wasn't marked to not expire (shouldn't happen) 1329 * If it expires now 1330 */ 1331 if (rte != NULL && 1332 mfc->mf6c_expire != 0 && 1333 --mfc->mf6c_expire == 0) { 1334 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1335 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1336 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1337 /* 1338 * drop all the packets 1339 * free the mbuf with the pkt, if, timing info 1340 */ 1341 do { 1342 struct rtdetq *n = rte->next; 1343 m_freem(rte->m); 1344 free(rte, M_MRTABLE6); 1345 rte = n; 1346 } while (rte != NULL); 1347 MRT6STAT_INC(mrt6s_cache_cleanups); 1348 n6expire[i]--; 1349 1350 *nptr = mfc->mf6c_next; 1351 free(mfc, M_MRTABLE6); 1352 } else { 1353 nptr = &mfc->mf6c_next; 1354 } 1355 } 1356 } 1357 MFC6_UNLOCK(); 1358 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1359 expire_upcalls, NULL); 1360 } 1361 1362 /* 1363 * Packet forwarding routine once entry in the cache is made 1364 */ 1365 static int 1366 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1367 { 1368 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1369 mifi_t mifi, iif; 1370 struct mif6 *mifp; 1371 int plen = m->m_pkthdr.len; 1372 struct in6_addr src0, dst0; /* copies for local work */ 1373 u_int32_t iszone, idzone, oszone, odzone; 1374 int error = 0; 1375 1376 /* 1377 * Macro to send packet on mif. Since RSVP packets don't get counted on 1378 * input, they shouldn't get counted on output, so statistics keeping is 1379 * separate. 1380 */ 1381 1382 #define MC6_SEND(ip6, mifp, m) do { \ 1383 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1384 register_send((ip6), (mifp), (m)); \ 1385 else \ 1386 phyint_send((ip6), (mifp), (m)); \ 1387 } while (/*CONSTCOND*/ 0) 1388 1389 /* 1390 * Don't forward if it didn't arrive from the parent mif 1391 * for its origin. 1392 */ 1393 mifi = rt->mf6c_parent; 1394 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1395 /* came in the wrong interface */ 1396 MRT6_DLOG(DEBUG_FORWARD, 1397 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1398 mifi, mif6table[mifi].m6_ifp->if_index); 1399 MRT6STAT_INC(mrt6s_wrong_if); 1400 rt->mf6c_wrong_if++; 1401 /* 1402 * If we are doing PIM processing, and we are forwarding 1403 * packets on this interface, send a message to the 1404 * routing daemon. 1405 */ 1406 /* have to make sure this is a valid mif */ 1407 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1408 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1409 /* 1410 * Check the M_LOOP flag to avoid an 1411 * unnecessary PIM assert. 1412 * XXX: M_LOOP is an ad-hoc hack... 1413 */ 1414 static struct sockaddr_in6 sin6 = 1415 { sizeof(sin6), AF_INET6 }; 1416 1417 struct mbuf *mm; 1418 struct mrt6msg *im; 1419 #ifdef MRT6_OINIT 1420 struct omrt6msg *oim; 1421 #endif 1422 1423 mm = m_copym(m, 0, sizeof(struct ip6_hdr), 1424 M_NOWAIT); 1425 if (mm && 1426 (!M_WRITABLE(mm) || 1427 mm->m_len < sizeof(struct ip6_hdr))) 1428 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1429 if (mm == NULL) 1430 return (ENOBUFS); 1431 1432 #ifdef MRT6_OINIT 1433 oim = NULL; 1434 #endif 1435 im = NULL; 1436 switch (V_ip6_mrouter_ver) { 1437 #ifdef MRT6_OINIT 1438 case MRT6_OINIT: 1439 oim = mtod(mm, struct omrt6msg *); 1440 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1441 oim->im6_mbz = 0; 1442 break; 1443 #endif 1444 case MRT6_INIT: 1445 im = mtod(mm, struct mrt6msg *); 1446 im->im6_msgtype = MRT6MSG_WRONGMIF; 1447 im->im6_mbz = 0; 1448 break; 1449 default: 1450 m_freem(mm); 1451 return (EINVAL); 1452 } 1453 1454 for (mifp = mif6table, iif = 0; 1455 iif < nummifs && mifp && 1456 mifp->m6_ifp != ifp; 1457 mifp++, iif++) 1458 ; 1459 1460 switch (V_ip6_mrouter_ver) { 1461 #ifdef MRT6_OINIT 1462 case MRT6_OINIT: 1463 oim->im6_mif = iif; 1464 sin6.sin6_addr = oim->im6_src; 1465 break; 1466 #endif 1467 case MRT6_INIT: 1468 im->im6_mif = iif; 1469 sin6.sin6_addr = im->im6_src; 1470 break; 1471 } 1472 1473 MRT6STAT_INC(mrt6s_upcalls); 1474 1475 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1476 MRT6_DLOG(DEBUG_ANY, 1477 "ip6_mrouter socket queue full"); 1478 MRT6STAT_INC(mrt6s_upq_sockfull); 1479 return (ENOBUFS); 1480 } /* if socket Q full */ 1481 } /* if PIM */ 1482 return (0); 1483 } /* if wrong iif */ 1484 1485 /* If I sourced this packet, it counts as output, else it was input. */ 1486 if (m->m_pkthdr.rcvif == NULL) { 1487 /* XXX: is rcvif really NULL when output?? */ 1488 mif6table[mifi].m6_pkt_out++; 1489 mif6table[mifi].m6_bytes_out += plen; 1490 } else { 1491 mif6table[mifi].m6_pkt_in++; 1492 mif6table[mifi].m6_bytes_in += plen; 1493 } 1494 rt->mf6c_pkt_cnt++; 1495 rt->mf6c_byte_cnt += plen; 1496 1497 /* 1498 * For each mif, forward a copy of the packet if there are group 1499 * members downstream on the interface. 1500 */ 1501 src0 = ip6->ip6_src; 1502 dst0 = ip6->ip6_dst; 1503 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1504 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1505 IP6STAT_INC(ip6s_badscope); 1506 return (error); 1507 } 1508 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1509 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1510 /* 1511 * check if the outgoing packet is going to break 1512 * a scope boundary. 1513 * XXX For packets through PIM register tunnel 1514 * interface, we believe a routing daemon. 1515 */ 1516 if (!(mif6table[rt->mf6c_parent].m6_flags & 1517 MIFF_REGISTER) && 1518 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1519 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1520 &oszone) || 1521 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1522 &odzone) || 1523 iszone != oszone || 1524 idzone != odzone) { 1525 IP6STAT_INC(ip6s_badscope); 1526 continue; 1527 } 1528 } 1529 1530 mifp->m6_pkt_out++; 1531 mifp->m6_bytes_out += plen; 1532 MC6_SEND(ip6, mifp, m); 1533 } 1534 } 1535 return (0); 1536 } 1537 1538 static void 1539 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1540 { 1541 #ifdef MRT6DEBUG 1542 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1543 #endif 1544 struct mbuf *mb_copy; 1545 struct ifnet *ifp = mifp->m6_ifp; 1546 int error = 0; 1547 u_long linkmtu; 1548 1549 /* 1550 * Make a new reference to the packet; make sure that 1551 * the IPv6 header is actually copied, not just referenced, 1552 * so that ip6_output() only scribbles on the copy. 1553 */ 1554 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1555 if (mb_copy && 1556 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1557 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1558 if (mb_copy == NULL) { 1559 return; 1560 } 1561 /* set MCAST flag to the outgoing packet */ 1562 mb_copy->m_flags |= M_MCAST; 1563 1564 /* 1565 * If we sourced the packet, call ip6_output since we may devide 1566 * the packet into fragments when the packet is too big for the 1567 * outgoing interface. 1568 * Otherwise, we can simply send the packet to the interface 1569 * sending queue. 1570 */ 1571 if (m->m_pkthdr.rcvif == NULL) { 1572 struct ip6_moptions im6o; 1573 1574 im6o.im6o_multicast_ifp = ifp; 1575 /* XXX: ip6_output will override ip6->ip6_hlim */ 1576 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1577 im6o.im6o_multicast_loop = 1; 1578 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1579 NULL, NULL); 1580 1581 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1582 (uint16_t)(mifp - mif6table), error); 1583 return; 1584 } 1585 1586 /* 1587 * If configured to loop back multicasts by default, 1588 * loop back a copy now. 1589 */ 1590 if (in6_mcast_loop) 1591 ip6_mloopback(ifp, m); 1592 1593 /* 1594 * Put the packet into the sending queue of the outgoing interface 1595 * if it would fit in the MTU of the interface. 1596 */ 1597 linkmtu = IN6_LINKMTU(ifp); 1598 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1599 struct sockaddr_in6 dst6; 1600 1601 bzero(&dst6, sizeof(dst6)); 1602 dst6.sin6_len = sizeof(struct sockaddr_in6); 1603 dst6.sin6_family = AF_INET6; 1604 dst6.sin6_addr = ip6->ip6_dst; 1605 1606 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1607 /* 1608 * We just call if_output instead of nd6_output here, since 1609 * we need no ND for a multicast forwarded packet...right? 1610 */ 1611 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1612 error = (*ifp->if_output)(ifp, mb_copy, 1613 (struct sockaddr *)&dst6, NULL); 1614 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1615 (uint16_t)(mifp - mif6table), error); 1616 } else { 1617 /* 1618 * pMTU discovery is intentionally disabled by default, since 1619 * various router may notify pMTU in multicast, which can be 1620 * a DDoS to a router 1621 */ 1622 if (V_ip6_mcast_pmtu) 1623 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1624 else { 1625 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1626 "g %s size %d (discarded)", if_name(ifp), 1627 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1628 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1629 mb_copy->m_pkthdr.len); 1630 m_freem(mb_copy); /* simply discard the packet */ 1631 } 1632 } 1633 } 1634 1635 static int 1636 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1637 { 1638 #ifdef MRT6DEBUG 1639 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1640 #endif 1641 struct mbuf *mm; 1642 int i, len = m->m_pkthdr.len; 1643 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1644 struct mrt6msg *im6; 1645 1646 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1647 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1648 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1649 PIM6STAT_INC(pim6s_snd_registers); 1650 1651 /* Make a copy of the packet to send to the user level process. */ 1652 mm = m_gethdr(M_NOWAIT, MT_DATA); 1653 if (mm == NULL) 1654 return (ENOBUFS); 1655 mm->m_data += max_linkhdr; 1656 mm->m_len = sizeof(struct ip6_hdr); 1657 1658 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 1659 m_freem(mm); 1660 return (ENOBUFS); 1661 } 1662 i = MHLEN - M_LEADINGSPACE(mm); 1663 if (i > len) 1664 i = len; 1665 mm = m_pullup(mm, i); 1666 if (mm == NULL) 1667 return (ENOBUFS); 1668 /* TODO: check it! */ 1669 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1670 1671 /* 1672 * Send message to routing daemon 1673 */ 1674 sin6.sin6_addr = ip6->ip6_src; 1675 1676 im6 = mtod(mm, struct mrt6msg *); 1677 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1678 im6->im6_mbz = 0; 1679 1680 im6->im6_mif = mif - mif6table; 1681 1682 /* iif info is not given for reg. encap.n */ 1683 MRT6STAT_INC(mrt6s_upcalls); 1684 1685 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1686 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1687 MRT6STAT_INC(mrt6s_upq_sockfull); 1688 return (ENOBUFS); 1689 } 1690 return (0); 1691 } 1692 1693 /* 1694 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1695 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1696 * into the kernel. 1697 */ 1698 static int 1699 pim6_encapcheck(const struct mbuf *m __unused, int off __unused, 1700 int proto __unused, void *arg __unused) 1701 { 1702 1703 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1704 return (8); /* claim the datagram. */ 1705 } 1706 1707 /* 1708 * PIM sparse mode hook 1709 * Receives the pim control messages, and passes them up to the listening 1710 * socket, using rip6_input. 1711 * The only message processed is the REGISTER pim message; the pim header 1712 * is stripped off, and the inner packet is passed to register_mforward. 1713 */ 1714 static int 1715 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused) 1716 { 1717 struct pim *pim; /* pointer to a pim struct */ 1718 struct ip6_hdr *ip6; 1719 int pimlen; 1720 int minlen; 1721 1722 PIM6STAT_INC(pim6s_rcv_total); 1723 1724 /* 1725 * Validate lengths 1726 */ 1727 pimlen = m->m_pkthdr.len - off; 1728 if (pimlen < PIM_MINLEN) { 1729 PIM6STAT_INC(pim6s_rcv_tooshort); 1730 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1731 m_freem(m); 1732 return (IPPROTO_DONE); 1733 } 1734 1735 /* 1736 * if the packet is at least as big as a REGISTER, go ahead 1737 * and grab the PIM REGISTER header size, to avoid another 1738 * possible m_pullup() later. 1739 * 1740 * PIM_MINLEN == pimhdr + u_int32 == 8 1741 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1742 */ 1743 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1744 1745 /* 1746 * Make sure that the IP6 and PIM headers in contiguous memory, and 1747 * possibly the PIM REGISTER header 1748 */ 1749 if (m->m_len < off + minlen) { 1750 m = m_pullup(m, off + minlen); 1751 if (m == NULL) { 1752 IP6STAT_INC(ip6s_exthdrtoolong); 1753 return (IPPROTO_DONE); 1754 } 1755 } 1756 ip6 = mtod(m, struct ip6_hdr *); 1757 pim = (struct pim *)((caddr_t)ip6 + off); 1758 1759 #define PIM6_CHECKSUM 1760 #ifdef PIM6_CHECKSUM 1761 { 1762 int cksumlen; 1763 1764 /* 1765 * Validate checksum. 1766 * If PIM REGISTER, exclude the data packet 1767 */ 1768 if (pim->pim_type == PIM_REGISTER) 1769 cksumlen = PIM_MINLEN; 1770 else 1771 cksumlen = pimlen; 1772 1773 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1774 PIM6STAT_INC(pim6s_rcv_badsum); 1775 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1776 m_freem(m); 1777 return (IPPROTO_DONE); 1778 } 1779 } 1780 #endif /* PIM_CHECKSUM */ 1781 1782 /* PIM version check */ 1783 if (pim->pim_ver != PIM_VERSION) { 1784 PIM6STAT_INC(pim6s_rcv_badversion); 1785 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1786 "incorrect version %d, expecting %d", 1787 pim->pim_ver, PIM_VERSION); 1788 m_freem(m); 1789 return (IPPROTO_DONE); 1790 } 1791 1792 if (pim->pim_type == PIM_REGISTER) { 1793 /* 1794 * since this is a REGISTER, we'll make a copy of the register 1795 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1796 * routing daemon. 1797 */ 1798 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1799 1800 struct mbuf *mcp; 1801 struct ip6_hdr *eip6; 1802 u_int32_t *reghdr; 1803 int rc; 1804 #ifdef MRT6DEBUG 1805 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1806 #endif 1807 1808 PIM6STAT_INC(pim6s_rcv_registers); 1809 1810 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1811 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1812 reg_mif_num); 1813 m_freem(m); 1814 return (IPPROTO_DONE); 1815 } 1816 1817 reghdr = (u_int32_t *)(pim + 1); 1818 1819 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1820 goto pim6_input_to_daemon; 1821 1822 /* 1823 * Validate length 1824 */ 1825 if (pimlen < PIM6_REG_MINLEN) { 1826 PIM6STAT_INC(pim6s_rcv_tooshort); 1827 PIM6STAT_INC(pim6s_rcv_badregisters); 1828 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1829 "size too small %d from %s", 1830 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1831 m_freem(m); 1832 return (IPPROTO_DONE); 1833 } 1834 1835 eip6 = (struct ip6_hdr *) (reghdr + 1); 1836 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1837 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1838 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1839 ntohs(eip6->ip6_plen)); 1840 1841 /* verify the version number of the inner packet */ 1842 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1843 PIM6STAT_INC(pim6s_rcv_badregisters); 1844 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1845 "of the inner packet", 1846 (eip6->ip6_vfc & IPV6_VERSION)); 1847 m_freem(m); 1848 return (IPPROTO_DONE); 1849 } 1850 1851 /* verify the inner packet is destined to a mcast group */ 1852 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1853 PIM6STAT_INC(pim6s_rcv_badregisters); 1854 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1855 "is not multicast %s", 1856 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1857 m_freem(m); 1858 return (IPPROTO_DONE); 1859 } 1860 1861 /* 1862 * make a copy of the whole header to pass to the daemon later. 1863 */ 1864 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT); 1865 if (mcp == NULL) { 1866 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1867 "could not copy register head"); 1868 m_freem(m); 1869 return (IPPROTO_DONE); 1870 } 1871 1872 /* 1873 * forward the inner ip6 packet; point m_data at the inner ip6. 1874 */ 1875 m_adj(m, off + PIM_MINLEN); 1876 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1877 "src %s, dst %s, mif %d", 1878 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1879 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1880 1881 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1882 dst.sin6_family, 0); 1883 1884 /* prepare the register head to send to the mrouting daemon */ 1885 m = mcp; 1886 } 1887 1888 /* 1889 * Pass the PIM message up to the daemon; if it is a register message 1890 * pass the 'head' only up to the daemon. This includes the 1891 * encapsulator ip6 header, pim header, register header and the 1892 * encapsulated ip6 header. 1893 */ 1894 pim6_input_to_daemon: 1895 return (rip6_input(&m, &off, proto)); 1896 } 1897 1898 static int 1899 ip6_mroute_modevent(module_t mod, int type, void *unused) 1900 { 1901 1902 switch (type) { 1903 case MOD_LOAD: 1904 MROUTER6_LOCK_INIT(); 1905 MFC6_LOCK_INIT(); 1906 MIF6_LOCK_INIT(); 1907 1908 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg, 1909 NULL, M_WAITOK); 1910 if (pim6_encap_cookie == NULL) { 1911 printf("ip6_mroute: unable to attach pim6 encap\n"); 1912 MIF6_LOCK_DESTROY(); 1913 MFC6_LOCK_DESTROY(); 1914 MROUTER6_LOCK_DESTROY(); 1915 return (EINVAL); 1916 } 1917 1918 ip6_mforward = X_ip6_mforward; 1919 ip6_mrouter_done = X_ip6_mrouter_done; 1920 ip6_mrouter_get = X_ip6_mrouter_get; 1921 ip6_mrouter_set = X_ip6_mrouter_set; 1922 mrt6_ioctl = X_mrt6_ioctl; 1923 break; 1924 1925 case MOD_UNLOAD: 1926 if (V_ip6_mrouter != NULL) 1927 return EINVAL; 1928 1929 if (pim6_encap_cookie) { 1930 ip6_encap_detach(pim6_encap_cookie); 1931 pim6_encap_cookie = NULL; 1932 } 1933 X_ip6_mrouter_done(); 1934 ip6_mforward = NULL; 1935 ip6_mrouter_done = NULL; 1936 ip6_mrouter_get = NULL; 1937 ip6_mrouter_set = NULL; 1938 mrt6_ioctl = NULL; 1939 1940 MIF6_LOCK_DESTROY(); 1941 MFC6_LOCK_DESTROY(); 1942 MROUTER6_LOCK_DESTROY(); 1943 break; 1944 1945 default: 1946 return (EOPNOTSUPP); 1947 } 1948 1949 return (0); 1950 } 1951 1952 static moduledata_t ip6_mroutemod = { 1953 "ip6_mroute", 1954 ip6_mroute_modevent, 1955 0 1956 }; 1957 1958 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);
Cache object: 6c96a1f5c1985f4a075299cef5dd1364
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