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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 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, "%s: socket %p", __func__, so); 559 560 if (v != 1) 561 return (ENOPROTOOPT); 562 563 MROUTER6_LOCK(); 564 565 if (V_ip6_mrouter != NULL) { 566 MROUTER6_UNLOCK(); 567 return (EADDRINUSE); 568 } 569 570 V_ip6_mrouter = so; 571 V_ip6_mrouter_ver = cmd; 572 573 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 574 bzero((caddr_t)n6expire, sizeof(n6expire)); 575 576 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 577 578 callout_init_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0); 579 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 580 expire_upcalls, NULL); 581 582 MROUTER6_UNLOCK(); 583 584 MRT6_DLOG(DEBUG_ANY, "finished"); 585 586 return (0); 587 } 588 589 /* 590 * Disable IPv6 multicast forwarding. 591 */ 592 int 593 X_ip6_mrouter_done(void) 594 { 595 mifi_t mifi; 596 u_long i; 597 struct mf6c *rt; 598 struct rtdetq *rte; 599 600 MROUTER6_LOCK(); 601 602 if (V_ip6_mrouter == NULL) { 603 MROUTER6_UNLOCK(); 604 return (EINVAL); 605 } 606 607 /* 608 * For each phyint in use, disable promiscuous reception of all IPv6 609 * multicasts. 610 */ 611 for (mifi = 0; mifi < nummifs; mifi++) { 612 if (mif6table[mifi].m6_ifp && 613 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 614 if_allmulti(mif6table[mifi].m6_ifp, 0); 615 } 616 } 617 bzero((caddr_t)mif6table, sizeof(mif6table)); 618 nummifs = 0; 619 620 V_pim6 = 0; /* used to stub out/in pim specific code */ 621 622 /* 623 * Free all multicast forwarding cache entries. 624 */ 625 MFC6_LOCK(); 626 for (i = 0; i < MF6CTBLSIZ; i++) { 627 rt = mf6ctable[i]; 628 while (rt) { 629 struct mf6c *frt; 630 631 for (rte = rt->mf6c_stall; rte != NULL; ) { 632 struct rtdetq *n = rte->next; 633 634 m_freem(rte->m); 635 free(rte, M_MRTABLE6); 636 rte = n; 637 } 638 frt = rt; 639 rt = rt->mf6c_next; 640 free(frt, M_MRTABLE6); 641 } 642 } 643 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 644 MFC6_UNLOCK(); 645 646 callout_drain(&expire_upcalls_ch); 647 648 /* 649 * Reset register interface 650 */ 651 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 652 if_detach(multicast_register_if6); 653 if_free(multicast_register_if6); 654 reg_mif_num = (mifi_t)-1; 655 multicast_register_if6 = NULL; 656 } 657 658 V_ip6_mrouter = NULL; 659 V_ip6_mrouter_ver = 0; 660 661 MROUTER6_UNLOCK(); 662 MRT6_DLOG(DEBUG_ANY, "finished"); 663 664 return (0); 665 } 666 667 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 668 669 /* 670 * Add a mif to the mif table 671 */ 672 static int 673 add_m6if(struct mif6ctl *mifcp) 674 { 675 struct epoch_tracker et; 676 struct mif6 *mifp; 677 struct ifnet *ifp; 678 int error; 679 680 MIF6_LOCK(); 681 682 if (mifcp->mif6c_mifi >= MAXMIFS) { 683 MIF6_UNLOCK(); 684 return (EINVAL); 685 } 686 mifp = mif6table + mifcp->mif6c_mifi; 687 if (mifp->m6_ifp != NULL) { 688 MIF6_UNLOCK(); 689 return (EADDRINUSE); /* XXX: is it appropriate? */ 690 } 691 692 NET_EPOCH_ENTER(et); 693 if ((ifp = ifnet_byindex(mifcp->mif6c_pifi)) == NULL) { 694 NET_EPOCH_EXIT(et); 695 MIF6_UNLOCK(); 696 return (ENXIO); 697 } 698 NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */ 699 700 if (mifcp->mif6c_flags & MIFF_REGISTER) { 701 if (reg_mif_num == (mifi_t)-1) { 702 ifp = if_alloc(IFT_OTHER); 703 704 if_initname(ifp, "register_mif", 0); 705 ifp->if_flags |= IFF_LOOPBACK; 706 if_attach(ifp); 707 multicast_register_if6 = ifp; 708 reg_mif_num = mifcp->mif6c_mifi; 709 /* 710 * it is impossible to guess the ifindex of the 711 * register interface. So mif6c_pifi is automatically 712 * calculated. 713 */ 714 mifcp->mif6c_pifi = ifp->if_index; 715 } else { 716 ifp = multicast_register_if6; 717 } 718 } else { 719 /* Make sure the interface supports multicast */ 720 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 721 MIF6_UNLOCK(); 722 return (EOPNOTSUPP); 723 } 724 725 error = if_allmulti(ifp, 1); 726 if (error) { 727 MIF6_UNLOCK(); 728 return (error); 729 } 730 } 731 732 mifp->m6_flags = mifcp->mif6c_flags; 733 mifp->m6_ifp = ifp; 734 735 /* initialize per mif pkt counters */ 736 mifp->m6_pkt_in = 0; 737 mifp->m6_pkt_out = 0; 738 mifp->m6_bytes_in = 0; 739 mifp->m6_bytes_out = 0; 740 741 /* Adjust nummifs up if the mifi is higher than nummifs */ 742 if (nummifs <= mifcp->mif6c_mifi) 743 nummifs = mifcp->mif6c_mifi + 1; 744 745 MIF6_UNLOCK(); 746 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 747 if_name(ifp)); 748 749 return (0); 750 } 751 752 /* 753 * Delete a mif from the mif table 754 */ 755 static int 756 del_m6if_locked(mifi_t *mifip) 757 { 758 struct mif6 *mifp = mif6table + *mifip; 759 mifi_t mifi; 760 struct ifnet *ifp; 761 762 MIF6_LOCK_ASSERT(); 763 764 if (*mifip >= nummifs) 765 return (EINVAL); 766 if (mifp->m6_ifp == NULL) 767 return (EINVAL); 768 769 if (!(mifp->m6_flags & MIFF_REGISTER)) { 770 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 771 ifp = mifp->m6_ifp; 772 if_allmulti(ifp, 0); 773 } else { 774 if (reg_mif_num != (mifi_t)-1 && 775 multicast_register_if6 != NULL) { 776 if_detach(multicast_register_if6); 777 if_free(multicast_register_if6); 778 reg_mif_num = (mifi_t)-1; 779 multicast_register_if6 = NULL; 780 } 781 } 782 783 bzero((caddr_t)mifp, sizeof(*mifp)); 784 785 /* Adjust nummifs down */ 786 for (mifi = nummifs; mifi > 0; mifi--) 787 if (mif6table[mifi - 1].m6_ifp) 788 break; 789 nummifs = mifi; 790 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 791 792 return (0); 793 } 794 795 static int 796 del_m6if(mifi_t *mifip) 797 { 798 int cc; 799 800 MIF6_LOCK(); 801 cc = del_m6if_locked(mifip); 802 MIF6_UNLOCK(); 803 804 return (cc); 805 } 806 807 /* 808 * Add an mfc entry 809 */ 810 static int 811 add_m6fc(struct mf6cctl *mfccp) 812 { 813 struct mf6c *rt; 814 u_long hash; 815 struct rtdetq *rte; 816 u_short nstl; 817 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 818 819 MFC6_LOCK(); 820 821 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 822 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 823 824 /* If an entry already exists, just update the fields */ 825 if (rt) { 826 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 827 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 828 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 829 mfccp->mf6cc_parent); 830 831 rt->mf6c_parent = mfccp->mf6cc_parent; 832 rt->mf6c_ifset = mfccp->mf6cc_ifset; 833 834 MFC6_UNLOCK(); 835 return (0); 836 } 837 838 /* 839 * Find the entry for which the upcall was made and update 840 */ 841 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 842 mfccp->mf6cc_mcastgrp.sin6_addr); 843 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 844 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 845 &mfccp->mf6cc_origin.sin6_addr) && 846 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 847 &mfccp->mf6cc_mcastgrp.sin6_addr) && 848 (rt->mf6c_stall != NULL)) { 849 if (nstl++) 850 log(LOG_ERR, 851 "add_m6fc: %s o %s g %s p %x dbx %p\n", 852 "multiple kernel entries", 853 ip6_sprintf(ip6bufo, 854 &mfccp->mf6cc_origin.sin6_addr), 855 ip6_sprintf(ip6bufg, 856 &mfccp->mf6cc_mcastgrp.sin6_addr), 857 mfccp->mf6cc_parent, rt->mf6c_stall); 858 859 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 860 ip6_sprintf(ip6bufo, 861 &mfccp->mf6cc_origin.sin6_addr), 862 ip6_sprintf(ip6bufg, 863 &mfccp->mf6cc_mcastgrp.sin6_addr), 864 mfccp->mf6cc_parent, rt->mf6c_stall); 865 866 rt->mf6c_origin = mfccp->mf6cc_origin; 867 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 868 rt->mf6c_parent = mfccp->mf6cc_parent; 869 rt->mf6c_ifset = mfccp->mf6cc_ifset; 870 /* initialize pkt counters per src-grp */ 871 rt->mf6c_pkt_cnt = 0; 872 rt->mf6c_byte_cnt = 0; 873 rt->mf6c_wrong_if = 0; 874 875 rt->mf6c_expire = 0; /* Don't clean this guy up */ 876 n6expire[hash]--; 877 878 /* free packets Qed at the end of this entry */ 879 for (rte = rt->mf6c_stall; rte != NULL; ) { 880 struct rtdetq *n = rte->next; 881 ip6_mdq(rte->m, rte->ifp, rt); 882 m_freem(rte->m); 883 #ifdef UPCALL_TIMING 884 collate(&(rte->t)); 885 #endif /* UPCALL_TIMING */ 886 free(rte, M_MRTABLE6); 887 rte = n; 888 } 889 rt->mf6c_stall = NULL; 890 } 891 } 892 893 /* 894 * It is possible that an entry is being inserted without an upcall 895 */ 896 if (nstl == 0) { 897 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 898 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 899 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 900 mfccp->mf6cc_parent); 901 902 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 903 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 904 &mfccp->mf6cc_origin.sin6_addr)&& 905 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 906 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 907 rt->mf6c_origin = mfccp->mf6cc_origin; 908 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 909 rt->mf6c_parent = mfccp->mf6cc_parent; 910 rt->mf6c_ifset = mfccp->mf6cc_ifset; 911 /* initialize pkt counters per src-grp */ 912 rt->mf6c_pkt_cnt = 0; 913 rt->mf6c_byte_cnt = 0; 914 rt->mf6c_wrong_if = 0; 915 916 if (rt->mf6c_expire) 917 n6expire[hash]--; 918 rt->mf6c_expire = 0; 919 } 920 } 921 if (rt == NULL) { 922 /* no upcall, so make a new entry */ 923 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 924 M_NOWAIT); 925 if (rt == NULL) { 926 MFC6_UNLOCK(); 927 return (ENOBUFS); 928 } 929 930 /* insert new entry at head of hash chain */ 931 rt->mf6c_origin = mfccp->mf6cc_origin; 932 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 933 rt->mf6c_parent = mfccp->mf6cc_parent; 934 rt->mf6c_ifset = mfccp->mf6cc_ifset; 935 /* initialize pkt counters per src-grp */ 936 rt->mf6c_pkt_cnt = 0; 937 rt->mf6c_byte_cnt = 0; 938 rt->mf6c_wrong_if = 0; 939 rt->mf6c_expire = 0; 940 rt->mf6c_stall = NULL; 941 942 /* link into table */ 943 rt->mf6c_next = mf6ctable[hash]; 944 mf6ctable[hash] = rt; 945 } 946 } 947 948 MFC6_UNLOCK(); 949 return (0); 950 } 951 952 #ifdef UPCALL_TIMING 953 /* 954 * collect delay statistics on the upcalls 955 */ 956 static void 957 collate(struct timeval *t) 958 { 959 u_long d; 960 struct timeval tp; 961 u_long delta; 962 963 GET_TIME(tp); 964 965 if (TV_LT(*t, tp)) 966 { 967 TV_DELTA(tp, *t, delta); 968 969 d = delta >> 10; 970 if (d > UPCALL_MAX) 971 d = UPCALL_MAX; 972 973 ++upcall_data[d]; 974 } 975 } 976 #endif /* UPCALL_TIMING */ 977 978 /* 979 * Delete an mfc entry 980 */ 981 static int 982 del_m6fc(struct mf6cctl *mfccp) 983 { 984 #ifdef MRT6DEBUG 985 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 986 #endif 987 struct sockaddr_in6 origin; 988 struct sockaddr_in6 mcastgrp; 989 struct mf6c *rt; 990 struct mf6c **nptr; 991 u_long hash; 992 993 origin = mfccp->mf6cc_origin; 994 mcastgrp = mfccp->mf6cc_mcastgrp; 995 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 996 997 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 998 ip6_sprintf(ip6bufo, &origin.sin6_addr), 999 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1000 1001 MFC6_LOCK(); 1002 1003 nptr = &mf6ctable[hash]; 1004 while ((rt = *nptr) != NULL) { 1005 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1006 &rt->mf6c_origin.sin6_addr) && 1007 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1008 &rt->mf6c_mcastgrp.sin6_addr) && 1009 rt->mf6c_stall == NULL) 1010 break; 1011 1012 nptr = &rt->mf6c_next; 1013 } 1014 if (rt == NULL) { 1015 MFC6_UNLOCK(); 1016 return (EADDRNOTAVAIL); 1017 } 1018 1019 *nptr = rt->mf6c_next; 1020 free(rt, M_MRTABLE6); 1021 1022 MFC6_UNLOCK(); 1023 1024 return (0); 1025 } 1026 1027 static int 1028 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1029 { 1030 1031 if (s) { 1032 if (sbappendaddr(&s->so_rcv, 1033 (struct sockaddr *)src, 1034 mm, (struct mbuf *)0) != 0) { 1035 sorwakeup(s); 1036 return (0); 1037 } else 1038 soroverflow(s); 1039 } 1040 m_freem(mm); 1041 return (-1); 1042 } 1043 1044 /* 1045 * IPv6 multicast forwarding function. This function assumes that the packet 1046 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1047 * pointed to by "ifp", and the packet is to be relayed to other networks 1048 * that have members of the packet's destination IPv6 multicast group. 1049 * 1050 * The packet is returned unscathed to the caller, unless it is 1051 * erroneous, in which case a non-zero return value tells the caller to 1052 * discard it. 1053 * 1054 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1055 * this function is called in the originating context (i.e., not when 1056 * forwarding a packet from other node). ip6_output(), which is currently the 1057 * only function that calls this function is called in the originating context, 1058 * explicitly ensures this condition. It is caller's responsibility to ensure 1059 * that if this function is called from somewhere else in the originating 1060 * context in the future. 1061 */ 1062 int 1063 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1064 { 1065 struct rtdetq *rte; 1066 struct mbuf *mb0; 1067 struct mf6c *rt; 1068 struct mif6 *mifp; 1069 struct mbuf *mm; 1070 u_long hash; 1071 mifi_t mifi; 1072 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1073 #ifdef UPCALL_TIMING 1074 struct timeval tp; 1075 1076 GET_TIME(tp); 1077 #endif /* UPCALL_TIMING */ 1078 1079 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1080 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1081 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1082 1083 /* 1084 * Don't forward a packet with Hop limit of zero or one, 1085 * or a packet destined to a local-only group. 1086 */ 1087 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1088 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1089 return (0); 1090 ip6->ip6_hlim--; 1091 1092 /* 1093 * Source address check: do not forward packets with unspecified 1094 * source. It was discussed in July 2000, on ipngwg mailing list. 1095 * This is rather more serious than unicast cases, because some 1096 * MLD packets can be sent with the unspecified source address 1097 * (although such packets must normally set 1 to the hop limit field). 1098 */ 1099 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1100 IP6STAT_INC(ip6s_cantforward); 1101 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1102 V_ip6_log_time = time_uptime; 1103 log(LOG_DEBUG, 1104 "cannot forward " 1105 "from %s to %s nxt %d received on %s\n", 1106 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1107 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1108 ip6->ip6_nxt, 1109 if_name(m->m_pkthdr.rcvif)); 1110 } 1111 return (0); 1112 } 1113 1114 MFC6_LOCK(); 1115 1116 /* 1117 * Determine forwarding mifs from the forwarding cache table 1118 */ 1119 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1120 MRT6STAT_INC(mrt6s_mfc_lookups); 1121 1122 /* Entry exists, so forward if necessary */ 1123 if (rt) { 1124 MFC6_UNLOCK(); 1125 return (ip6_mdq(m, ifp, rt)); 1126 } 1127 1128 /* 1129 * If we don't have a route for packet's origin, 1130 * Make a copy of the packet & send message to routing daemon. 1131 */ 1132 MRT6STAT_INC(mrt6s_no_route); 1133 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1134 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1135 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1136 1137 /* 1138 * Allocate mbufs early so that we don't do extra work if we 1139 * are just going to fail anyway. 1140 */ 1141 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1142 if (rte == NULL) { 1143 MFC6_UNLOCK(); 1144 return (ENOBUFS); 1145 } 1146 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1147 /* 1148 * Pullup packet header if needed before storing it, 1149 * as other references may modify it in the meantime. 1150 */ 1151 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1152 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1153 if (mb0 == NULL) { 1154 free(rte, M_MRTABLE6); 1155 MFC6_UNLOCK(); 1156 return (ENOBUFS); 1157 } 1158 1159 /* is there an upcall waiting for this packet? */ 1160 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1161 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1162 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1163 &rt->mf6c_origin.sin6_addr) && 1164 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1165 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1166 break; 1167 } 1168 1169 if (rt == NULL) { 1170 struct mrt6msg *im; 1171 #ifdef MRT6_OINIT 1172 struct omrt6msg *oim; 1173 #endif 1174 /* no upcall, so make a new entry */ 1175 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1176 if (rt == NULL) { 1177 free(rte, M_MRTABLE6); 1178 m_freem(mb0); 1179 MFC6_UNLOCK(); 1180 return (ENOBUFS); 1181 } 1182 /* 1183 * Make a copy of the header to send to the user 1184 * level process 1185 */ 1186 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT); 1187 if (mm == NULL) { 1188 free(rte, M_MRTABLE6); 1189 m_freem(mb0); 1190 free(rt, M_MRTABLE6); 1191 MFC6_UNLOCK(); 1192 return (ENOBUFS); 1193 } 1194 1195 /* 1196 * Send message to routing daemon 1197 */ 1198 sin6.sin6_addr = ip6->ip6_src; 1199 im = NULL; 1200 #ifdef MRT6_OINIT 1201 oim = NULL; 1202 #endif 1203 switch (V_ip6_mrouter_ver) { 1204 #ifdef MRT6_OINIT 1205 case MRT6_OINIT: 1206 oim = mtod(mm, struct omrt6msg *); 1207 oim->im6_msgtype = MRT6MSG_NOCACHE; 1208 oim->im6_mbz = 0; 1209 break; 1210 #endif 1211 case MRT6_INIT: 1212 im = mtod(mm, struct mrt6msg *); 1213 im->im6_msgtype = MRT6MSG_NOCACHE; 1214 im->im6_mbz = 0; 1215 break; 1216 default: 1217 free(rte, M_MRTABLE6); 1218 m_freem(mb0); 1219 free(rt, M_MRTABLE6); 1220 MFC6_UNLOCK(); 1221 return (EINVAL); 1222 } 1223 1224 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1225 for (mifp = mif6table, mifi = 0; 1226 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1227 ; 1228 1229 switch (V_ip6_mrouter_ver) { 1230 #ifdef MRT6_OINIT 1231 case MRT6_OINIT: 1232 oim->im6_mif = mifi; 1233 break; 1234 #endif 1235 case MRT6_INIT: 1236 im->im6_mif = mifi; 1237 break; 1238 } 1239 1240 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1241 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1242 "socket queue full\n"); 1243 MRT6STAT_INC(mrt6s_upq_sockfull); 1244 free(rte, M_MRTABLE6); 1245 m_freem(mb0); 1246 free(rt, M_MRTABLE6); 1247 MFC6_UNLOCK(); 1248 return (ENOBUFS); 1249 } 1250 1251 MRT6STAT_INC(mrt6s_upcalls); 1252 1253 /* insert new entry at head of hash chain */ 1254 bzero(rt, sizeof(*rt)); 1255 rt->mf6c_origin.sin6_family = AF_INET6; 1256 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1257 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1258 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1259 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1260 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1261 rt->mf6c_expire = UPCALL_EXPIRE; 1262 n6expire[hash]++; 1263 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1264 1265 /* link into table */ 1266 rt->mf6c_next = mf6ctable[hash]; 1267 mf6ctable[hash] = rt; 1268 /* Add this entry to the end of the queue */ 1269 rt->mf6c_stall = rte; 1270 } else { 1271 /* determine if q has overflowed */ 1272 struct rtdetq **p; 1273 int npkts = 0; 1274 1275 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1276 if (++npkts > MAX_UPQ6) { 1277 MRT6STAT_INC(mrt6s_upq_ovflw); 1278 free(rte, M_MRTABLE6); 1279 m_freem(mb0); 1280 MFC6_UNLOCK(); 1281 return (0); 1282 } 1283 1284 /* Add this entry to the end of the queue */ 1285 *p = rte; 1286 } 1287 1288 rte->next = NULL; 1289 rte->m = mb0; 1290 rte->ifp = ifp; 1291 #ifdef UPCALL_TIMING 1292 rte->t = tp; 1293 #endif /* UPCALL_TIMING */ 1294 1295 MFC6_UNLOCK(); 1296 1297 return (0); 1298 } 1299 1300 /* 1301 * Clean up cache entries if upcalls are not serviced 1302 * Call from the Slow Timeout mechanism, every half second. 1303 */ 1304 static void 1305 expire_upcalls(void *unused) 1306 { 1307 #ifdef MRT6DEBUG 1308 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1309 #endif 1310 struct rtdetq *rte; 1311 struct mf6c *mfc, **nptr; 1312 u_long i; 1313 1314 MFC6_LOCK_ASSERT(); 1315 1316 for (i = 0; i < MF6CTBLSIZ; i++) { 1317 if (n6expire[i] == 0) 1318 continue; 1319 nptr = &mf6ctable[i]; 1320 while ((mfc = *nptr) != NULL) { 1321 rte = mfc->mf6c_stall; 1322 /* 1323 * Skip real cache entries 1324 * Make sure it wasn't marked to not expire (shouldn't happen) 1325 * If it expires now 1326 */ 1327 if (rte != NULL && 1328 mfc->mf6c_expire != 0 && 1329 --mfc->mf6c_expire == 0) { 1330 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1331 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1332 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1333 /* 1334 * drop all the packets 1335 * free the mbuf with the pkt, if, timing info 1336 */ 1337 do { 1338 struct rtdetq *n = rte->next; 1339 m_freem(rte->m); 1340 free(rte, M_MRTABLE6); 1341 rte = n; 1342 } while (rte != NULL); 1343 MRT6STAT_INC(mrt6s_cache_cleanups); 1344 n6expire[i]--; 1345 1346 *nptr = mfc->mf6c_next; 1347 free(mfc, M_MRTABLE6); 1348 } else { 1349 nptr = &mfc->mf6c_next; 1350 } 1351 } 1352 } 1353 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1354 expire_upcalls, NULL); 1355 } 1356 1357 /* 1358 * Packet forwarding routine once entry in the cache is made 1359 */ 1360 static int 1361 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1362 { 1363 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1364 mifi_t mifi, iif; 1365 struct mif6 *mifp; 1366 int plen = m->m_pkthdr.len; 1367 struct in6_addr src0, dst0; /* copies for local work */ 1368 u_int32_t iszone, idzone, oszone, odzone; 1369 int error = 0; 1370 1371 /* 1372 * Don't forward if it didn't arrive from the parent mif 1373 * for its origin. 1374 */ 1375 mifi = rt->mf6c_parent; 1376 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1377 /* came in the wrong interface */ 1378 MRT6_DLOG(DEBUG_FORWARD, 1379 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1380 mifi, mif6table[mifi].m6_ifp->if_index); 1381 MRT6STAT_INC(mrt6s_wrong_if); 1382 rt->mf6c_wrong_if++; 1383 /* 1384 * If we are doing PIM processing, and we are forwarding 1385 * packets on this interface, send a message to the 1386 * routing daemon. 1387 */ 1388 /* have to make sure this is a valid mif */ 1389 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1390 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1391 /* 1392 * Check the M_LOOP flag to avoid an 1393 * unnecessary PIM assert. 1394 * XXX: M_LOOP is an ad-hoc hack... 1395 */ 1396 static struct sockaddr_in6 sin6 = 1397 { sizeof(sin6), AF_INET6 }; 1398 1399 struct mbuf *mm; 1400 struct mrt6msg *im; 1401 #ifdef MRT6_OINIT 1402 struct omrt6msg *oim; 1403 #endif 1404 1405 mm = m_copym(m, 0, sizeof(struct ip6_hdr), 1406 M_NOWAIT); 1407 if (mm && 1408 (!M_WRITABLE(mm) || 1409 mm->m_len < sizeof(struct ip6_hdr))) 1410 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1411 if (mm == NULL) 1412 return (ENOBUFS); 1413 1414 #ifdef MRT6_OINIT 1415 oim = NULL; 1416 #endif 1417 im = NULL; 1418 switch (V_ip6_mrouter_ver) { 1419 #ifdef MRT6_OINIT 1420 case MRT6_OINIT: 1421 oim = mtod(mm, struct omrt6msg *); 1422 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1423 oim->im6_mbz = 0; 1424 break; 1425 #endif 1426 case MRT6_INIT: 1427 im = mtod(mm, struct mrt6msg *); 1428 im->im6_msgtype = MRT6MSG_WRONGMIF; 1429 im->im6_mbz = 0; 1430 break; 1431 default: 1432 m_freem(mm); 1433 return (EINVAL); 1434 } 1435 1436 for (mifp = mif6table, iif = 0; 1437 iif < nummifs && mifp && 1438 mifp->m6_ifp != ifp; 1439 mifp++, iif++) 1440 ; 1441 1442 switch (V_ip6_mrouter_ver) { 1443 #ifdef MRT6_OINIT 1444 case MRT6_OINIT: 1445 oim->im6_mif = iif; 1446 sin6.sin6_addr = oim->im6_src; 1447 break; 1448 #endif 1449 case MRT6_INIT: 1450 im->im6_mif = iif; 1451 sin6.sin6_addr = im->im6_src; 1452 break; 1453 } 1454 1455 MRT6STAT_INC(mrt6s_upcalls); 1456 1457 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1458 MRT6_DLOG(DEBUG_ANY, 1459 "ip6_mrouter socket queue full"); 1460 MRT6STAT_INC(mrt6s_upq_sockfull); 1461 return (ENOBUFS); 1462 } /* if socket Q full */ 1463 } /* if PIM */ 1464 return (0); 1465 } /* if wrong iif */ 1466 1467 /* If I sourced this packet, it counts as output, else it was input. */ 1468 if (m->m_pkthdr.rcvif == NULL) { 1469 /* XXX: is rcvif really NULL when output?? */ 1470 mif6table[mifi].m6_pkt_out++; 1471 mif6table[mifi].m6_bytes_out += plen; 1472 } else { 1473 mif6table[mifi].m6_pkt_in++; 1474 mif6table[mifi].m6_bytes_in += plen; 1475 } 1476 rt->mf6c_pkt_cnt++; 1477 rt->mf6c_byte_cnt += plen; 1478 1479 /* 1480 * For each mif, forward a copy of the packet if there are group 1481 * members downstream on the interface. 1482 */ 1483 src0 = ip6->ip6_src; 1484 dst0 = ip6->ip6_dst; 1485 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1486 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1487 IP6STAT_INC(ip6s_badscope); 1488 return (error); 1489 } 1490 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1491 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1492 /* 1493 * check if the outgoing packet is going to break 1494 * a scope boundary. 1495 * XXX For packets through PIM register tunnel 1496 * interface, we believe a routing daemon. 1497 */ 1498 if (!(mif6table[rt->mf6c_parent].m6_flags & 1499 MIFF_REGISTER) && 1500 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1501 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1502 &oszone) || 1503 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1504 &odzone) || 1505 iszone != oszone || 1506 idzone != odzone) { 1507 IP6STAT_INC(ip6s_badscope); 1508 continue; 1509 } 1510 } 1511 1512 mifp->m6_pkt_out++; 1513 mifp->m6_bytes_out += plen; 1514 if (mifp->m6_flags & MIFF_REGISTER) 1515 register_send(ip6, mifp, m); 1516 else 1517 phyint_send(ip6, mifp, m); 1518 } 1519 } 1520 return (0); 1521 } 1522 1523 static void 1524 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1525 { 1526 #ifdef MRT6DEBUG 1527 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1528 #endif 1529 struct mbuf *mb_copy; 1530 struct ifnet *ifp = mifp->m6_ifp; 1531 int error __unused = 0; 1532 u_long linkmtu; 1533 1534 /* 1535 * Make a new reference to the packet; make sure that 1536 * the IPv6 header is actually copied, not just referenced, 1537 * so that ip6_output() only scribbles on the copy. 1538 */ 1539 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1540 if (mb_copy && 1541 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1542 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1543 if (mb_copy == NULL) { 1544 return; 1545 } 1546 /* set MCAST flag to the outgoing packet */ 1547 mb_copy->m_flags |= M_MCAST; 1548 1549 /* 1550 * If we sourced the packet, call ip6_output since we may devide 1551 * the packet into fragments when the packet is too big for the 1552 * outgoing interface. 1553 * Otherwise, we can simply send the packet to the interface 1554 * sending queue. 1555 */ 1556 if (m->m_pkthdr.rcvif == NULL) { 1557 struct ip6_moptions im6o; 1558 struct epoch_tracker et; 1559 1560 im6o.im6o_multicast_ifp = ifp; 1561 /* XXX: ip6_output will override ip6->ip6_hlim */ 1562 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1563 im6o.im6o_multicast_loop = 1; 1564 NET_EPOCH_ENTER(et); 1565 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1566 NULL, NULL); 1567 NET_EPOCH_EXIT(et); 1568 1569 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1570 (uint16_t)(mifp - mif6table), error); 1571 return; 1572 } 1573 1574 /* 1575 * If configured to loop back multicasts by default, 1576 * loop back a copy now. 1577 */ 1578 if (in6_mcast_loop) 1579 ip6_mloopback(ifp, m); 1580 1581 /* 1582 * Put the packet into the sending queue of the outgoing interface 1583 * if it would fit in the MTU of the interface. 1584 */ 1585 linkmtu = IN6_LINKMTU(ifp); 1586 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1587 struct sockaddr_in6 dst6; 1588 1589 bzero(&dst6, sizeof(dst6)); 1590 dst6.sin6_len = sizeof(struct sockaddr_in6); 1591 dst6.sin6_family = AF_INET6; 1592 dst6.sin6_addr = ip6->ip6_dst; 1593 1594 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1595 /* 1596 * We just call if_output instead of nd6_output here, since 1597 * we need no ND for a multicast forwarded packet...right? 1598 */ 1599 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1600 error = (*ifp->if_output)(ifp, mb_copy, 1601 (struct sockaddr *)&dst6, NULL); 1602 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1603 (uint16_t)(mifp - mif6table), error); 1604 } else { 1605 /* 1606 * pMTU discovery is intentionally disabled by default, since 1607 * various router may notify pMTU in multicast, which can be 1608 * a DDoS to a router 1609 */ 1610 if (V_ip6_mcast_pmtu) 1611 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1612 else { 1613 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1614 "g %s size %d (discarded)", if_name(ifp), 1615 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1616 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1617 mb_copy->m_pkthdr.len); 1618 m_freem(mb_copy); /* simply discard the packet */ 1619 } 1620 } 1621 } 1622 1623 static int 1624 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1625 { 1626 #ifdef MRT6DEBUG 1627 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1628 #endif 1629 struct mbuf *mm; 1630 int i, len = m->m_pkthdr.len; 1631 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1632 struct mrt6msg *im6; 1633 1634 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1635 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1636 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1637 PIM6STAT_INC(pim6s_snd_registers); 1638 1639 /* Make a copy of the packet to send to the user level process. */ 1640 mm = m_gethdr(M_NOWAIT, MT_DATA); 1641 if (mm == NULL) 1642 return (ENOBUFS); 1643 mm->m_data += max_linkhdr; 1644 mm->m_len = sizeof(struct ip6_hdr); 1645 1646 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 1647 m_freem(mm); 1648 return (ENOBUFS); 1649 } 1650 i = MHLEN - M_LEADINGSPACE(mm); 1651 if (i > len) 1652 i = len; 1653 mm = m_pullup(mm, i); 1654 if (mm == NULL) 1655 return (ENOBUFS); 1656 /* TODO: check it! */ 1657 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1658 1659 /* 1660 * Send message to routing daemon 1661 */ 1662 sin6.sin6_addr = ip6->ip6_src; 1663 1664 im6 = mtod(mm, struct mrt6msg *); 1665 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1666 im6->im6_mbz = 0; 1667 1668 im6->im6_mif = mif - mif6table; 1669 1670 /* iif info is not given for reg. encap.n */ 1671 MRT6STAT_INC(mrt6s_upcalls); 1672 1673 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1674 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1675 MRT6STAT_INC(mrt6s_upq_sockfull); 1676 return (ENOBUFS); 1677 } 1678 return (0); 1679 } 1680 1681 /* 1682 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1683 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1684 * into the kernel. 1685 */ 1686 static int 1687 pim6_encapcheck(const struct mbuf *m __unused, int off __unused, 1688 int proto __unused, void *arg __unused) 1689 { 1690 1691 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1692 return (8); /* claim the datagram. */ 1693 } 1694 1695 /* 1696 * PIM sparse mode hook 1697 * Receives the pim control messages, and passes them up to the listening 1698 * socket, using rip6_input. 1699 * The only message processed is the REGISTER pim message; the pim header 1700 * is stripped off, and the inner packet is passed to register_mforward. 1701 */ 1702 static int 1703 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused) 1704 { 1705 struct pim *pim; /* pointer to a pim struct */ 1706 struct ip6_hdr *ip6; 1707 int pimlen; 1708 int minlen; 1709 1710 PIM6STAT_INC(pim6s_rcv_total); 1711 1712 /* 1713 * Validate lengths 1714 */ 1715 pimlen = m->m_pkthdr.len - off; 1716 if (pimlen < PIM_MINLEN) { 1717 PIM6STAT_INC(pim6s_rcv_tooshort); 1718 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1719 m_freem(m); 1720 return (IPPROTO_DONE); 1721 } 1722 1723 /* 1724 * if the packet is at least as big as a REGISTER, go ahead 1725 * and grab the PIM REGISTER header size, to avoid another 1726 * possible m_pullup() later. 1727 * 1728 * PIM_MINLEN == pimhdr + u_int32 == 8 1729 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1730 */ 1731 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1732 1733 /* 1734 * Make sure that the IP6 and PIM headers in contiguous memory, and 1735 * possibly the PIM REGISTER header 1736 */ 1737 if (m->m_len < off + minlen) { 1738 m = m_pullup(m, off + minlen); 1739 if (m == NULL) { 1740 IP6STAT_INC(ip6s_exthdrtoolong); 1741 return (IPPROTO_DONE); 1742 } 1743 } 1744 ip6 = mtod(m, struct ip6_hdr *); 1745 pim = (struct pim *)((caddr_t)ip6 + off); 1746 1747 #define PIM6_CHECKSUM 1748 #ifdef PIM6_CHECKSUM 1749 { 1750 int cksumlen; 1751 1752 /* 1753 * Validate checksum. 1754 * If PIM REGISTER, exclude the data packet 1755 */ 1756 if (pim->pim_type == PIM_REGISTER) 1757 cksumlen = PIM_MINLEN; 1758 else 1759 cksumlen = pimlen; 1760 1761 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1762 PIM6STAT_INC(pim6s_rcv_badsum); 1763 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1764 m_freem(m); 1765 return (IPPROTO_DONE); 1766 } 1767 } 1768 #endif /* PIM_CHECKSUM */ 1769 1770 /* PIM version check */ 1771 if (pim->pim_ver != PIM_VERSION) { 1772 PIM6STAT_INC(pim6s_rcv_badversion); 1773 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1774 "incorrect version %d, expecting %d", 1775 pim->pim_ver, PIM_VERSION); 1776 m_freem(m); 1777 return (IPPROTO_DONE); 1778 } 1779 1780 if (pim->pim_type == PIM_REGISTER) { 1781 /* 1782 * since this is a REGISTER, we'll make a copy of the register 1783 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1784 * routing daemon. 1785 */ 1786 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1787 1788 struct mbuf *mcp; 1789 struct ip6_hdr *eip6; 1790 u_int32_t *reghdr; 1791 #ifdef MRT6DEBUG 1792 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1793 #endif 1794 1795 PIM6STAT_INC(pim6s_rcv_registers); 1796 1797 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1798 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1799 reg_mif_num); 1800 m_freem(m); 1801 return (IPPROTO_DONE); 1802 } 1803 1804 reghdr = (u_int32_t *)(pim + 1); 1805 1806 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1807 goto pim6_input_to_daemon; 1808 1809 /* 1810 * Validate length 1811 */ 1812 if (pimlen < PIM6_REG_MINLEN) { 1813 PIM6STAT_INC(pim6s_rcv_tooshort); 1814 PIM6STAT_INC(pim6s_rcv_badregisters); 1815 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1816 "size too small %d from %s", 1817 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1818 m_freem(m); 1819 return (IPPROTO_DONE); 1820 } 1821 1822 eip6 = (struct ip6_hdr *) (reghdr + 1); 1823 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1824 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1825 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1826 ntohs(eip6->ip6_plen)); 1827 1828 /* verify the version number of the inner packet */ 1829 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1830 PIM6STAT_INC(pim6s_rcv_badregisters); 1831 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1832 "of the inner packet", 1833 (eip6->ip6_vfc & IPV6_VERSION)); 1834 m_freem(m); 1835 return (IPPROTO_DONE); 1836 } 1837 1838 /* verify the inner packet is destined to a mcast group */ 1839 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1840 PIM6STAT_INC(pim6s_rcv_badregisters); 1841 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1842 "is not multicast %s", 1843 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1844 m_freem(m); 1845 return (IPPROTO_DONE); 1846 } 1847 1848 /* 1849 * make a copy of the whole header to pass to the daemon later. 1850 */ 1851 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT); 1852 if (mcp == NULL) { 1853 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1854 "could not copy register head"); 1855 m_freem(m); 1856 return (IPPROTO_DONE); 1857 } 1858 1859 /* 1860 * forward the inner ip6 packet; point m_data at the inner ip6. 1861 */ 1862 m_adj(m, off + PIM_MINLEN); 1863 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1864 "src %s, dst %s, mif %d", 1865 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1866 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1867 1868 if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1869 dst.sin6_family, 0); 1870 1871 /* prepare the register head to send to the mrouting daemon */ 1872 m = mcp; 1873 } 1874 1875 /* 1876 * Pass the PIM message up to the daemon; if it is a register message 1877 * pass the 'head' only up to the daemon. This includes the 1878 * encapsulator ip6 header, pim header, register header and the 1879 * encapsulated ip6 header. 1880 */ 1881 pim6_input_to_daemon: 1882 return (rip6_input(&m, &off, proto)); 1883 } 1884 1885 static int 1886 ip6_mroute_modevent(module_t mod, int type, void *unused) 1887 { 1888 1889 switch (type) { 1890 case MOD_LOAD: 1891 MROUTER6_LOCK_INIT(); 1892 MFC6_LOCK_INIT(); 1893 MIF6_LOCK_INIT(); 1894 1895 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg, 1896 NULL, M_WAITOK); 1897 if (pim6_encap_cookie == NULL) { 1898 printf("ip6_mroute: unable to attach pim6 encap\n"); 1899 MIF6_LOCK_DESTROY(); 1900 MFC6_LOCK_DESTROY(); 1901 MROUTER6_LOCK_DESTROY(); 1902 return (EINVAL); 1903 } 1904 1905 ip6_mforward = X_ip6_mforward; 1906 ip6_mrouter_done = X_ip6_mrouter_done; 1907 ip6_mrouter_get = X_ip6_mrouter_get; 1908 ip6_mrouter_set = X_ip6_mrouter_set; 1909 mrt6_ioctl = X_mrt6_ioctl; 1910 break; 1911 1912 case MOD_UNLOAD: 1913 if (V_ip6_mrouter != NULL) 1914 return EINVAL; 1915 1916 if (pim6_encap_cookie) { 1917 ip6_encap_detach(pim6_encap_cookie); 1918 pim6_encap_cookie = NULL; 1919 } 1920 X_ip6_mrouter_done(); 1921 ip6_mforward = NULL; 1922 ip6_mrouter_done = NULL; 1923 ip6_mrouter_get = NULL; 1924 ip6_mrouter_set = NULL; 1925 mrt6_ioctl = NULL; 1926 1927 MIF6_LOCK_DESTROY(); 1928 MFC6_LOCK_DESTROY(); 1929 MROUTER6_LOCK_DESTROY(); 1930 break; 1931 1932 default: 1933 return (EOPNOTSUPP); 1934 } 1935 1936 return (0); 1937 } 1938 1939 static moduledata_t ip6_mroutemod = { 1940 "ip6_mroute", 1941 ip6_mroute_modevent, 1942 0 1943 }; 1944 1945 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);
Cache object: bd07e45c84b61794b72c2f2b02b9745e
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