1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1989 Stephen Deering 36 * Copyright (c) 1992, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * Stephen Deering of Stanford University. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 67 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp 68 */ 69 70 /* 71 * IP multicast forwarding procedures 72 * 73 * Written by David Waitzman, BBN Labs, August 1988. 74 * Modified by Steve Deering, Stanford, February 1989. 75 * Modified by Mark J. Steiglitz, Stanford, May, 1991 76 * Modified by Van Jacobson, LBL, January 1993 77 * Modified by Ajit Thyagarajan, PARC, August 1993 78 * Modified by Bill Fenner, PARC, April 1994 79 * 80 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 81 */ 82 83 #include <sys/cdefs.h> 84 __FBSDID("$FreeBSD$"); 85 86 #include "opt_inet6.h" 87 88 #include <sys/param.h> 89 #include <sys/callout.h> 90 #include <sys/errno.h> 91 #include <sys/kernel.h> 92 #include <sys/lock.h> 93 #include <sys/malloc.h> 94 #include <sys/mbuf.h> 95 #include <sys/module.h> 96 #include <sys/domain.h> 97 #include <sys/protosw.h> 98 #include <sys/sdt.h> 99 #include <sys/signalvar.h> 100 #include <sys/socket.h> 101 #include <sys/socketvar.h> 102 #include <sys/sockio.h> 103 #include <sys/sx.h> 104 #include <sys/sysctl.h> 105 #include <sys/syslog.h> 106 #include <sys/systm.h> 107 #include <sys/time.h> 108 109 #include <net/if.h> 110 #include <net/if_var.h> 111 #include <net/if_types.h> 112 #include <net/vnet.h> 113 114 #include <netinet/in.h> 115 #include <netinet/in_var.h> 116 #include <netinet/icmp6.h> 117 #include <netinet/ip_encap.h> 118 119 #include <netinet/ip6.h> 120 #include <netinet/in_kdtrace.h> 121 #include <netinet6/ip6_var.h> 122 #include <netinet6/scope6_var.h> 123 #include <netinet6/nd6.h> 124 #include <netinet6/ip6_mroute.h> 125 #include <netinet6/pim6.h> 126 #include <netinet6/pim6_var.h> 127 128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 129 130 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 131 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 132 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 133 static int set_pim6(int *); 134 static int socket_send(struct socket *, struct mbuf *, 135 struct sockaddr_in6 *); 136 137 extern int in6_mcast_loop; 138 extern struct domain inet6domain; 139 140 static const struct encaptab *pim6_encap_cookie; 141 static int pim6_encapcheck(const struct mbuf *, int, int, void *); 142 static int pim6_input(struct mbuf *, int, int, void *); 143 144 static const struct encap_config ipv6_encap_cfg = { 145 .proto = IPPROTO_PIM, 146 .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN, 147 .exact_match = 8, 148 .check = pim6_encapcheck, 149 .input = pim6_input 150 }; 151 152 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0; 153 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 154 155 SYSCTL_DECL(_net_inet6); 156 SYSCTL_DECL(_net_inet6_ip6); 157 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, 158 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 159 "PIM"); 160 161 static struct mrt6stat mrt6stat; 162 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 163 &mrt6stat, mrt6stat, 164 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 165 166 #define MRT6STAT_INC(name) mrt6stat.name += 1 167 #define NO_RTE_FOUND 0x1 168 #define RTE_FOUND 0x2 169 170 static struct sx mrouter6_mtx; 171 #define MROUTER6_LOCKPTR() (&mrouter6_mtx) 172 #define MROUTER6_LOCK() sx_xlock(MROUTER6_LOCKPTR()) 173 #define MROUTER6_UNLOCK() sx_xunlock(MROUTER6_LOCKPTR()) 174 #define MROUTER6_LOCK_ASSERT() sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED 175 #define MROUTER6_LOCK_INIT() sx_init(MROUTER6_LOCKPTR(), "mrouter6") 176 #define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR()) 177 178 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 179 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 180 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 181 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 182 "netinet6/ip6_mroute.h)"); 183 184 static struct mtx mfc6_mtx; 185 #define MFC6_LOCKPTR() (&mfc6_mtx) 186 #define MFC6_LOCK() mtx_lock(MFC6_LOCKPTR()) 187 #define MFC6_UNLOCK() mtx_unlock(MFC6_LOCKPTR()) 188 #define MFC6_LOCK_ASSERT() mtx_assert(MFC6_LOCKPTR(), MA_OWNED) 189 #define MFC6_LOCK_INIT() mtx_init(MFC6_LOCKPTR(), \ 190 "IPv6 multicast forwarding cache", \ 191 NULL, MTX_DEF) 192 #define MFC6_LOCK_DESTROY() mtx_destroy(MFC6_LOCKPTR()) 193 194 static u_char n6expire[MF6CTBLSIZ]; 195 196 static struct mif6 mif6table[MAXMIFS]; 197 static int 198 sysctl_mif6table(SYSCTL_HANDLER_ARGS) 199 { 200 struct mif6_sctl *out; 201 int error; 202 203 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, 204 M_WAITOK | M_ZERO); 205 for (int i = 0; i < MAXMIFS; i++) { 206 out[i].m6_flags = mif6table[i].m6_flags; 207 out[i].m6_rate_limit = mif6table[i].m6_rate_limit; 208 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr; 209 if (mif6table[i].m6_ifp != NULL) 210 out[i].m6_ifp = mif6table[i].m6_ifp->if_index; 211 else 212 out[i].m6_ifp = 0; 213 out[i].m6_pkt_in = mif6table[i].m6_pkt_in; 214 out[i].m6_pkt_out = mif6table[i].m6_pkt_out; 215 out[i].m6_bytes_in = mif6table[i].m6_bytes_in; 216 out[i].m6_bytes_out = mif6table[i].m6_bytes_out; 217 } 218 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS); 219 free(out, M_TEMP); 220 return (error); 221 } 222 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, 223 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 224 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]", 225 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], " 226 "netinet6/ip6_mroute.h)"); 227 228 static struct mtx mif6_mtx; 229 #define MIF6_LOCKPTR() (&mif6_mtx) 230 #define MIF6_LOCK() mtx_lock(MIF6_LOCKPTR()) 231 #define MIF6_UNLOCK() mtx_unlock(MIF6_LOCKPTR()) 232 #define MIF6_LOCK_ASSERT() mtx_assert(MIF6_LOCKPTR(), MA_OWNED) 233 #define MIF6_LOCK_INIT() \ 234 mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF) 235 #define MIF6_LOCK_DESTROY() mtx_destroy(MIF6_LOCKPTR()) 236 237 #ifdef MRT6DEBUG 238 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */ 239 #define V_mrt6debug VNET(mrt6debug) 240 #define DEBUG_MFC 0x02 241 #define DEBUG_FORWARD 0x04 242 #define DEBUG_EXPIRE 0x08 243 #define DEBUG_XMIT 0x10 244 #define DEBUG_REG 0x20 245 #define DEBUG_PIM 0x40 246 #define DEBUG_ERR 0x80 247 #define DEBUG_ANY 0x7f 248 #define MRT6_DLOG(m, fmt, ...) \ 249 if (V_mrt6debug & (m)) \ 250 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 251 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 252 #else 253 #define MRT6_DLOG(m, fmt, ...) 254 #endif 255 256 static void expire_upcalls(void *); 257 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 258 #define UPCALL_EXPIRE 6 /* number of timeouts */ 259 260 /* 261 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 262 */ 263 264 /* 265 * 'Interfaces' associated with decapsulator (so we can tell 266 * packets that went through it from ones that get reflected 267 * by a broken gateway). Different from IPv4 register_if, 268 * these interfaces are linked into the system ifnet list, 269 * because per-interface IPv6 statistics are maintained in 270 * ifp->if_afdata. But it does not have any routes point 271 * to them. I.e., packets can't be sent this way. They 272 * only exist as a placeholder for multicast source 273 * verification. 274 */ 275 static struct ifnet *multicast_register_if6; 276 277 #define ENCAP_HOPS 64 278 279 /* 280 * Private variables. 281 */ 282 static mifi_t nummifs = 0; 283 static mifi_t reg_mif_num = (mifi_t)-1; 284 285 static struct pim6stat pim6stat; 286 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 287 &pim6stat, pim6stat, 288 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 289 290 #define PIM6STAT_INC(name) pim6stat.name += 1 291 VNET_DEFINE_STATIC(int, pim6); 292 #define V_pim6 VNET(pim6) 293 294 /* 295 * Hash function for a source, group entry 296 */ 297 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 298 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 299 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 300 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 301 302 /* 303 * Find a route for a given origin IPv6 address and Multicast group address. 304 */ 305 #define MF6CFIND(o, g, rt) do { \ 306 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 307 rt = NULL; \ 308 while (_rt) { \ 309 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 310 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 311 (_rt->mf6c_stall == NULL)) { \ 312 rt = _rt; \ 313 break; \ 314 } \ 315 _rt = _rt->mf6c_next; \ 316 } \ 317 if (rt == NULL) { \ 318 MRT6STAT_INC(mrt6s_mfc_misses); \ 319 } \ 320 } while (/*CONSTCOND*/ 0) 321 322 /* 323 * Macros to compute elapsed time efficiently 324 * Borrowed from Van Jacobson's scheduling code 325 * XXX: replace with timersub() ? 326 */ 327 #define TV_DELTA(a, b, delta) do { \ 328 int xxs; \ 329 \ 330 delta = (a).tv_usec - (b).tv_usec; \ 331 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 332 switch (xxs) { \ 333 case 2: \ 334 delta += 1000000; \ 335 /* FALLTHROUGH */ \ 336 case 1: \ 337 delta += 1000000; \ 338 break; \ 339 default: \ 340 delta += (1000000 * xxs); \ 341 } \ 342 } \ 343 } while (/*CONSTCOND*/ 0) 344 345 /* XXX: replace with timercmp(a, b, <) ? */ 346 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 347 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 348 349 #ifdef UPCALL_TIMING 350 #define UPCALL_MAX 50 351 static u_long upcall_data[UPCALL_MAX + 1]; 352 static void collate(); 353 #endif /* UPCALL_TIMING */ 354 355 static int ip6_mrouter_init(struct socket *, int, int); 356 static int add_m6fc(struct mf6cctl *); 357 static int add_m6if(struct mif6ctl *); 358 static int del_m6fc(struct mf6cctl *); 359 static int del_m6if(mifi_t *); 360 static int del_m6if_locked(mifi_t *); 361 static int get_mif6_cnt(struct sioc_mif_req6 *); 362 static int get_sg_cnt(struct sioc_sg_req6 *); 363 364 static struct callout expire_upcalls_ch; 365 366 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 367 int X_ip6_mrouter_done(void); 368 int X_ip6_mrouter_set(struct socket *, struct sockopt *); 369 int X_ip6_mrouter_get(struct socket *, struct sockopt *); 370 int X_mrt6_ioctl(u_long, caddr_t); 371 372 /* 373 * Handle MRT setsockopt commands to modify the multicast routing tables. 374 */ 375 int 376 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 377 { 378 int error = 0; 379 int optval; 380 struct mif6ctl mifc; 381 struct mf6cctl mfcc; 382 mifi_t mifi; 383 384 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 385 return (EPERM); 386 387 switch (sopt->sopt_name) { 388 case MRT6_INIT: 389 #ifdef MRT6_OINIT 390 case MRT6_OINIT: 391 #endif 392 error = sooptcopyin(sopt, &optval, sizeof(optval), 393 sizeof(optval)); 394 if (error) 395 break; 396 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 397 break; 398 case MRT6_DONE: 399 error = X_ip6_mrouter_done(); 400 break; 401 case MRT6_ADD_MIF: 402 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 403 if (error) 404 break; 405 error = add_m6if(&mifc); 406 break; 407 case MRT6_ADD_MFC: 408 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 409 if (error) 410 break; 411 error = add_m6fc(&mfcc); 412 break; 413 case MRT6_DEL_MFC: 414 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 415 if (error) 416 break; 417 error = del_m6fc(&mfcc); 418 break; 419 case MRT6_DEL_MIF: 420 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 421 if (error) 422 break; 423 error = del_m6if(&mifi); 424 break; 425 case MRT6_PIM: 426 error = sooptcopyin(sopt, &optval, sizeof(optval), 427 sizeof(optval)); 428 if (error) 429 break; 430 error = set_pim6(&optval); 431 break; 432 default: 433 error = EOPNOTSUPP; 434 break; 435 } 436 437 return (error); 438 } 439 440 /* 441 * Handle MRT getsockopt commands 442 */ 443 int 444 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 445 { 446 int error = 0; 447 448 if (so != V_ip6_mrouter) 449 return (EACCES); 450 451 switch (sopt->sopt_name) { 452 case MRT6_PIM: 453 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 454 break; 455 } 456 return (error); 457 } 458 459 /* 460 * Handle ioctl commands to obtain information from the cache 461 */ 462 int 463 X_mrt6_ioctl(u_long cmd, caddr_t data) 464 { 465 int ret; 466 467 ret = EINVAL; 468 469 switch (cmd) { 470 case SIOCGETSGCNT_IN6: 471 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 472 break; 473 474 case SIOCGETMIFCNT_IN6: 475 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 476 break; 477 478 default: 479 break; 480 } 481 482 return (ret); 483 } 484 485 /* 486 * returns the packet, byte, rpf-failure count for the source group provided 487 */ 488 static int 489 get_sg_cnt(struct sioc_sg_req6 *req) 490 { 491 struct mf6c *rt; 492 int ret; 493 494 ret = 0; 495 496 MFC6_LOCK(); 497 498 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 499 if (rt == NULL) { 500 ret = ESRCH; 501 } else { 502 req->pktcnt = rt->mf6c_pkt_cnt; 503 req->bytecnt = rt->mf6c_byte_cnt; 504 req->wrong_if = rt->mf6c_wrong_if; 505 } 506 507 MFC6_UNLOCK(); 508 509 return (ret); 510 } 511 512 /* 513 * returns the input and output packet and byte counts on the mif provided 514 */ 515 static int 516 get_mif6_cnt(struct sioc_mif_req6 *req) 517 { 518 mifi_t mifi; 519 int ret; 520 521 ret = 0; 522 mifi = req->mifi; 523 524 MIF6_LOCK(); 525 526 if (mifi >= nummifs) { 527 ret = EINVAL; 528 } else { 529 req->icount = mif6table[mifi].m6_pkt_in; 530 req->ocount = mif6table[mifi].m6_pkt_out; 531 req->ibytes = mif6table[mifi].m6_bytes_in; 532 req->obytes = mif6table[mifi].m6_bytes_out; 533 } 534 535 MIF6_UNLOCK(); 536 537 return (ret); 538 } 539 540 static int 541 set_pim6(int *i) 542 { 543 if ((*i != 1) && (*i != 0)) 544 return (EINVAL); 545 546 V_pim6 = *i; 547 548 return (0); 549 } 550 551 /* 552 * Enable multicast routing 553 */ 554 static int 555 ip6_mrouter_init(struct socket *so, int v, int cmd) 556 { 557 558 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 559 so->so_type, so->so_proto->pr_protocol); 560 561 if (so->so_type != SOCK_RAW || 562 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 563 return (EOPNOTSUPP); 564 565 if (v != 1) 566 return (ENOPROTOOPT); 567 568 MROUTER6_LOCK(); 569 570 if (V_ip6_mrouter != NULL) { 571 MROUTER6_UNLOCK(); 572 return (EADDRINUSE); 573 } 574 575 V_ip6_mrouter = so; 576 V_ip6_mrouter_ver = cmd; 577 578 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 579 bzero((caddr_t)n6expire, sizeof(n6expire)); 580 581 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 582 583 callout_init_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0); 584 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 585 expire_upcalls, NULL); 586 587 MROUTER6_UNLOCK(); 588 589 MRT6_DLOG(DEBUG_ANY, "finished"); 590 591 return (0); 592 } 593 594 /* 595 * Disable IPv6 multicast forwarding. 596 */ 597 int 598 X_ip6_mrouter_done(void) 599 { 600 mifi_t mifi; 601 u_long i; 602 struct mf6c *rt; 603 struct rtdetq *rte; 604 605 MROUTER6_LOCK(); 606 607 if (V_ip6_mrouter == NULL) { 608 MROUTER6_UNLOCK(); 609 return (EINVAL); 610 } 611 612 /* 613 * For each phyint in use, disable promiscuous reception of all IPv6 614 * multicasts. 615 */ 616 for (mifi = 0; mifi < nummifs; mifi++) { 617 if (mif6table[mifi].m6_ifp && 618 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 619 if_allmulti(mif6table[mifi].m6_ifp, 0); 620 } 621 } 622 bzero((caddr_t)mif6table, sizeof(mif6table)); 623 nummifs = 0; 624 625 V_pim6 = 0; /* used to stub out/in pim specific code */ 626 627 /* 628 * Free all multicast forwarding cache entries. 629 */ 630 MFC6_LOCK(); 631 for (i = 0; i < MF6CTBLSIZ; i++) { 632 rt = mf6ctable[i]; 633 while (rt) { 634 struct mf6c *frt; 635 636 for (rte = rt->mf6c_stall; rte != NULL; ) { 637 struct rtdetq *n = rte->next; 638 639 m_freem(rte->m); 640 free(rte, M_MRTABLE6); 641 rte = n; 642 } 643 frt = rt; 644 rt = rt->mf6c_next; 645 free(frt, M_MRTABLE6); 646 } 647 } 648 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 649 MFC6_UNLOCK(); 650 651 callout_drain(&expire_upcalls_ch); 652 653 /* 654 * Reset register interface 655 */ 656 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 657 if_detach(multicast_register_if6); 658 if_free(multicast_register_if6); 659 reg_mif_num = (mifi_t)-1; 660 multicast_register_if6 = NULL; 661 } 662 663 V_ip6_mrouter = NULL; 664 V_ip6_mrouter_ver = 0; 665 666 MROUTER6_UNLOCK(); 667 MRT6_DLOG(DEBUG_ANY, "finished"); 668 669 return (0); 670 } 671 672 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 673 674 /* 675 * Add a mif to the mif table 676 */ 677 static int 678 add_m6if(struct mif6ctl *mifcp) 679 { 680 struct epoch_tracker et; 681 struct mif6 *mifp; 682 struct ifnet *ifp; 683 int error; 684 685 MIF6_LOCK(); 686 687 if (mifcp->mif6c_mifi >= MAXMIFS) { 688 MIF6_UNLOCK(); 689 return (EINVAL); 690 } 691 mifp = mif6table + mifcp->mif6c_mifi; 692 if (mifp->m6_ifp != NULL) { 693 MIF6_UNLOCK(); 694 return (EADDRINUSE); /* XXX: is it appropriate? */ 695 } 696 697 NET_EPOCH_ENTER(et); 698 if ((ifp = ifnet_byindex(mifcp->mif6c_pifi)) == NULL) { 699 NET_EPOCH_EXIT(et); 700 MIF6_UNLOCK(); 701 return (ENXIO); 702 } 703 NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */ 704 705 if (mifcp->mif6c_flags & MIFF_REGISTER) { 706 if (reg_mif_num == (mifi_t)-1) { 707 ifp = if_alloc(IFT_OTHER); 708 709 if_initname(ifp, "register_mif", 0); 710 ifp->if_flags |= IFF_LOOPBACK; 711 if_attach(ifp); 712 multicast_register_if6 = ifp; 713 reg_mif_num = mifcp->mif6c_mifi; 714 /* 715 * it is impossible to guess the ifindex of the 716 * register interface. So mif6c_pifi is automatically 717 * calculated. 718 */ 719 mifcp->mif6c_pifi = ifp->if_index; 720 } else { 721 ifp = multicast_register_if6; 722 } 723 } else { 724 /* Make sure the interface supports multicast */ 725 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 726 MIF6_UNLOCK(); 727 return (EOPNOTSUPP); 728 } 729 730 error = if_allmulti(ifp, 1); 731 if (error) { 732 MIF6_UNLOCK(); 733 return (error); 734 } 735 } 736 737 mifp->m6_flags = mifcp->mif6c_flags; 738 mifp->m6_ifp = ifp; 739 740 /* initialize per mif pkt counters */ 741 mifp->m6_pkt_in = 0; 742 mifp->m6_pkt_out = 0; 743 mifp->m6_bytes_in = 0; 744 mifp->m6_bytes_out = 0; 745 746 /* Adjust nummifs up if the mifi is higher than nummifs */ 747 if (nummifs <= mifcp->mif6c_mifi) 748 nummifs = mifcp->mif6c_mifi + 1; 749 750 MIF6_UNLOCK(); 751 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 752 if_name(ifp)); 753 754 return (0); 755 } 756 757 /* 758 * Delete a mif from the mif table 759 */ 760 static int 761 del_m6if_locked(mifi_t *mifip) 762 { 763 struct mif6 *mifp = mif6table + *mifip; 764 mifi_t mifi; 765 struct ifnet *ifp; 766 767 MIF6_LOCK_ASSERT(); 768 769 if (*mifip >= nummifs) 770 return (EINVAL); 771 if (mifp->m6_ifp == NULL) 772 return (EINVAL); 773 774 if (!(mifp->m6_flags & MIFF_REGISTER)) { 775 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 776 ifp = mifp->m6_ifp; 777 if_allmulti(ifp, 0); 778 } else { 779 if (reg_mif_num != (mifi_t)-1 && 780 multicast_register_if6 != NULL) { 781 if_detach(multicast_register_if6); 782 if_free(multicast_register_if6); 783 reg_mif_num = (mifi_t)-1; 784 multicast_register_if6 = NULL; 785 } 786 } 787 788 bzero((caddr_t)mifp, sizeof(*mifp)); 789 790 /* Adjust nummifs down */ 791 for (mifi = nummifs; mifi > 0; mifi--) 792 if (mif6table[mifi - 1].m6_ifp) 793 break; 794 nummifs = mifi; 795 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 796 797 return (0); 798 } 799 800 static int 801 del_m6if(mifi_t *mifip) 802 { 803 int cc; 804 805 MIF6_LOCK(); 806 cc = del_m6if_locked(mifip); 807 MIF6_UNLOCK(); 808 809 return (cc); 810 } 811 812 /* 813 * Add an mfc entry 814 */ 815 static int 816 add_m6fc(struct mf6cctl *mfccp) 817 { 818 struct mf6c *rt; 819 u_long hash; 820 struct rtdetq *rte; 821 u_short nstl; 822 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 823 824 MFC6_LOCK(); 825 826 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 827 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 828 829 /* If an entry already exists, just update the fields */ 830 if (rt) { 831 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 832 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 833 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 834 mfccp->mf6cc_parent); 835 836 rt->mf6c_parent = mfccp->mf6cc_parent; 837 rt->mf6c_ifset = mfccp->mf6cc_ifset; 838 839 MFC6_UNLOCK(); 840 return (0); 841 } 842 843 /* 844 * Find the entry for which the upcall was made and update 845 */ 846 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 847 mfccp->mf6cc_mcastgrp.sin6_addr); 848 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 849 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 850 &mfccp->mf6cc_origin.sin6_addr) && 851 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 852 &mfccp->mf6cc_mcastgrp.sin6_addr) && 853 (rt->mf6c_stall != NULL)) { 854 if (nstl++) 855 log(LOG_ERR, 856 "add_m6fc: %s o %s g %s p %x dbx %p\n", 857 "multiple kernel entries", 858 ip6_sprintf(ip6bufo, 859 &mfccp->mf6cc_origin.sin6_addr), 860 ip6_sprintf(ip6bufg, 861 &mfccp->mf6cc_mcastgrp.sin6_addr), 862 mfccp->mf6cc_parent, rt->mf6c_stall); 863 864 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 865 ip6_sprintf(ip6bufo, 866 &mfccp->mf6cc_origin.sin6_addr), 867 ip6_sprintf(ip6bufg, 868 &mfccp->mf6cc_mcastgrp.sin6_addr), 869 mfccp->mf6cc_parent, rt->mf6c_stall); 870 871 rt->mf6c_origin = mfccp->mf6cc_origin; 872 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 873 rt->mf6c_parent = mfccp->mf6cc_parent; 874 rt->mf6c_ifset = mfccp->mf6cc_ifset; 875 /* initialize pkt counters per src-grp */ 876 rt->mf6c_pkt_cnt = 0; 877 rt->mf6c_byte_cnt = 0; 878 rt->mf6c_wrong_if = 0; 879 880 rt->mf6c_expire = 0; /* Don't clean this guy up */ 881 n6expire[hash]--; 882 883 /* free packets Qed at the end of this entry */ 884 for (rte = rt->mf6c_stall; rte != NULL; ) { 885 struct rtdetq *n = rte->next; 886 ip6_mdq(rte->m, rte->ifp, rt); 887 m_freem(rte->m); 888 #ifdef UPCALL_TIMING 889 collate(&(rte->t)); 890 #endif /* UPCALL_TIMING */ 891 free(rte, M_MRTABLE6); 892 rte = n; 893 } 894 rt->mf6c_stall = NULL; 895 } 896 } 897 898 /* 899 * It is possible that an entry is being inserted without an upcall 900 */ 901 if (nstl == 0) { 902 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 903 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 904 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 905 mfccp->mf6cc_parent); 906 907 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 908 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 909 &mfccp->mf6cc_origin.sin6_addr)&& 910 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 911 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 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_ASSERT(); 1320 1321 for (i = 0; i < MF6CTBLSIZ; i++) { 1322 if (n6expire[i] == 0) 1323 continue; 1324 nptr = &mf6ctable[i]; 1325 while ((mfc = *nptr) != NULL) { 1326 rte = mfc->mf6c_stall; 1327 /* 1328 * Skip real cache entries 1329 * Make sure it wasn't marked to not expire (shouldn't happen) 1330 * If it expires now 1331 */ 1332 if (rte != NULL && 1333 mfc->mf6c_expire != 0 && 1334 --mfc->mf6c_expire == 0) { 1335 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1336 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1337 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1338 /* 1339 * drop all the packets 1340 * free the mbuf with the pkt, if, timing info 1341 */ 1342 do { 1343 struct rtdetq *n = rte->next; 1344 m_freem(rte->m); 1345 free(rte, M_MRTABLE6); 1346 rte = n; 1347 } while (rte != NULL); 1348 MRT6STAT_INC(mrt6s_cache_cleanups); 1349 n6expire[i]--; 1350 1351 *nptr = mfc->mf6c_next; 1352 free(mfc, M_MRTABLE6); 1353 } else { 1354 nptr = &mfc->mf6c_next; 1355 } 1356 } 1357 } 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 * Don't forward if it didn't arrive from the parent mif 1378 * for its origin. 1379 */ 1380 mifi = rt->mf6c_parent; 1381 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1382 /* came in the wrong interface */ 1383 MRT6_DLOG(DEBUG_FORWARD, 1384 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1385 mifi, mif6table[mifi].m6_ifp->if_index); 1386 MRT6STAT_INC(mrt6s_wrong_if); 1387 rt->mf6c_wrong_if++; 1388 /* 1389 * If we are doing PIM processing, and we are forwarding 1390 * packets on this interface, send a message to the 1391 * routing daemon. 1392 */ 1393 /* have to make sure this is a valid mif */ 1394 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1395 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1396 /* 1397 * Check the M_LOOP flag to avoid an 1398 * unnecessary PIM assert. 1399 * XXX: M_LOOP is an ad-hoc hack... 1400 */ 1401 static struct sockaddr_in6 sin6 = 1402 { sizeof(sin6), AF_INET6 }; 1403 1404 struct mbuf *mm; 1405 struct mrt6msg *im; 1406 #ifdef MRT6_OINIT 1407 struct omrt6msg *oim; 1408 #endif 1409 1410 mm = m_copym(m, 0, sizeof(struct ip6_hdr), 1411 M_NOWAIT); 1412 if (mm && 1413 (!M_WRITABLE(mm) || 1414 mm->m_len < sizeof(struct ip6_hdr))) 1415 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1416 if (mm == NULL) 1417 return (ENOBUFS); 1418 1419 #ifdef MRT6_OINIT 1420 oim = NULL; 1421 #endif 1422 im = NULL; 1423 switch (V_ip6_mrouter_ver) { 1424 #ifdef MRT6_OINIT 1425 case MRT6_OINIT: 1426 oim = mtod(mm, struct omrt6msg *); 1427 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1428 oim->im6_mbz = 0; 1429 break; 1430 #endif 1431 case MRT6_INIT: 1432 im = mtod(mm, struct mrt6msg *); 1433 im->im6_msgtype = MRT6MSG_WRONGMIF; 1434 im->im6_mbz = 0; 1435 break; 1436 default: 1437 m_freem(mm); 1438 return (EINVAL); 1439 } 1440 1441 for (mifp = mif6table, iif = 0; 1442 iif < nummifs && mifp && 1443 mifp->m6_ifp != ifp; 1444 mifp++, iif++) 1445 ; 1446 1447 switch (V_ip6_mrouter_ver) { 1448 #ifdef MRT6_OINIT 1449 case MRT6_OINIT: 1450 oim->im6_mif = iif; 1451 sin6.sin6_addr = oim->im6_src; 1452 break; 1453 #endif 1454 case MRT6_INIT: 1455 im->im6_mif = iif; 1456 sin6.sin6_addr = im->im6_src; 1457 break; 1458 } 1459 1460 MRT6STAT_INC(mrt6s_upcalls); 1461 1462 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1463 MRT6_DLOG(DEBUG_ANY, 1464 "ip6_mrouter socket queue full"); 1465 MRT6STAT_INC(mrt6s_upq_sockfull); 1466 return (ENOBUFS); 1467 } /* if socket Q full */ 1468 } /* if PIM */ 1469 return (0); 1470 } /* if wrong iif */ 1471 1472 /* If I sourced this packet, it counts as output, else it was input. */ 1473 if (m->m_pkthdr.rcvif == NULL) { 1474 /* XXX: is rcvif really NULL when output?? */ 1475 mif6table[mifi].m6_pkt_out++; 1476 mif6table[mifi].m6_bytes_out += plen; 1477 } else { 1478 mif6table[mifi].m6_pkt_in++; 1479 mif6table[mifi].m6_bytes_in += plen; 1480 } 1481 rt->mf6c_pkt_cnt++; 1482 rt->mf6c_byte_cnt += plen; 1483 1484 /* 1485 * For each mif, forward a copy of the packet if there are group 1486 * members downstream on the interface. 1487 */ 1488 src0 = ip6->ip6_src; 1489 dst0 = ip6->ip6_dst; 1490 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1491 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1492 IP6STAT_INC(ip6s_badscope); 1493 return (error); 1494 } 1495 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1496 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1497 /* 1498 * check if the outgoing packet is going to break 1499 * a scope boundary. 1500 * XXX For packets through PIM register tunnel 1501 * interface, we believe a routing daemon. 1502 */ 1503 if (!(mif6table[rt->mf6c_parent].m6_flags & 1504 MIFF_REGISTER) && 1505 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1506 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1507 &oszone) || 1508 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1509 &odzone) || 1510 iszone != oszone || 1511 idzone != odzone) { 1512 IP6STAT_INC(ip6s_badscope); 1513 continue; 1514 } 1515 } 1516 1517 mifp->m6_pkt_out++; 1518 mifp->m6_bytes_out += plen; 1519 if (mifp->m6_flags & MIFF_REGISTER) 1520 register_send(ip6, mifp, m); 1521 else 1522 phyint_send(ip6, mifp, m); 1523 } 1524 } 1525 return (0); 1526 } 1527 1528 static void 1529 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1530 { 1531 #ifdef MRT6DEBUG 1532 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1533 #endif 1534 struct mbuf *mb_copy; 1535 struct ifnet *ifp = mifp->m6_ifp; 1536 int error __unused = 0; 1537 u_long linkmtu; 1538 1539 /* 1540 * Make a new reference to the packet; make sure that 1541 * the IPv6 header is actually copied, not just referenced, 1542 * so that ip6_output() only scribbles on the copy. 1543 */ 1544 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1545 if (mb_copy && 1546 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1547 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1548 if (mb_copy == NULL) { 1549 return; 1550 } 1551 /* set MCAST flag to the outgoing packet */ 1552 mb_copy->m_flags |= M_MCAST; 1553 1554 /* 1555 * If we sourced the packet, call ip6_output since we may devide 1556 * the packet into fragments when the packet is too big for the 1557 * outgoing interface. 1558 * Otherwise, we can simply send the packet to the interface 1559 * sending queue. 1560 */ 1561 if (m->m_pkthdr.rcvif == NULL) { 1562 struct ip6_moptions im6o; 1563 struct epoch_tracker et; 1564 1565 im6o.im6o_multicast_ifp = ifp; 1566 /* XXX: ip6_output will override ip6->ip6_hlim */ 1567 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1568 im6o.im6o_multicast_loop = 1; 1569 NET_EPOCH_ENTER(et); 1570 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1571 NULL, NULL); 1572 NET_EPOCH_EXIT(et); 1573 1574 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1575 (uint16_t)(mifp - mif6table), error); 1576 return; 1577 } 1578 1579 /* 1580 * If configured to loop back multicasts by default, 1581 * loop back a copy now. 1582 */ 1583 if (in6_mcast_loop) 1584 ip6_mloopback(ifp, m); 1585 1586 /* 1587 * Put the packet into the sending queue of the outgoing interface 1588 * if it would fit in the MTU of the interface. 1589 */ 1590 linkmtu = IN6_LINKMTU(ifp); 1591 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1592 struct sockaddr_in6 dst6; 1593 1594 bzero(&dst6, sizeof(dst6)); 1595 dst6.sin6_len = sizeof(struct sockaddr_in6); 1596 dst6.sin6_family = AF_INET6; 1597 dst6.sin6_addr = ip6->ip6_dst; 1598 1599 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1600 /* 1601 * We just call if_output instead of nd6_output here, since 1602 * we need no ND for a multicast forwarded packet...right? 1603 */ 1604 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1605 error = (*ifp->if_output)(ifp, mb_copy, 1606 (struct sockaddr *)&dst6, NULL); 1607 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1608 (uint16_t)(mifp - mif6table), error); 1609 } else { 1610 /* 1611 * pMTU discovery is intentionally disabled by default, since 1612 * various router may notify pMTU in multicast, which can be 1613 * a DDoS to a router 1614 */ 1615 if (V_ip6_mcast_pmtu) 1616 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1617 else { 1618 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1619 "g %s size %d (discarded)", if_name(ifp), 1620 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1621 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1622 mb_copy->m_pkthdr.len); 1623 m_freem(mb_copy); /* simply discard the packet */ 1624 } 1625 } 1626 } 1627 1628 static int 1629 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1630 { 1631 #ifdef MRT6DEBUG 1632 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1633 #endif 1634 struct mbuf *mm; 1635 int i, len = m->m_pkthdr.len; 1636 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1637 struct mrt6msg *im6; 1638 1639 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1640 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1641 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1642 PIM6STAT_INC(pim6s_snd_registers); 1643 1644 /* Make a copy of the packet to send to the user level process. */ 1645 mm = m_gethdr(M_NOWAIT, MT_DATA); 1646 if (mm == NULL) 1647 return (ENOBUFS); 1648 mm->m_data += max_linkhdr; 1649 mm->m_len = sizeof(struct ip6_hdr); 1650 1651 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 1652 m_freem(mm); 1653 return (ENOBUFS); 1654 } 1655 i = MHLEN - M_LEADINGSPACE(mm); 1656 if (i > len) 1657 i = len; 1658 mm = m_pullup(mm, i); 1659 if (mm == NULL) 1660 return (ENOBUFS); 1661 /* TODO: check it! */ 1662 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1663 1664 /* 1665 * Send message to routing daemon 1666 */ 1667 sin6.sin6_addr = ip6->ip6_src; 1668 1669 im6 = mtod(mm, struct mrt6msg *); 1670 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1671 im6->im6_mbz = 0; 1672 1673 im6->im6_mif = mif - mif6table; 1674 1675 /* iif info is not given for reg. encap.n */ 1676 MRT6STAT_INC(mrt6s_upcalls); 1677 1678 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1679 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1680 MRT6STAT_INC(mrt6s_upq_sockfull); 1681 return (ENOBUFS); 1682 } 1683 return (0); 1684 } 1685 1686 /* 1687 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1688 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1689 * into the kernel. 1690 */ 1691 static int 1692 pim6_encapcheck(const struct mbuf *m __unused, int off __unused, 1693 int proto __unused, void *arg __unused) 1694 { 1695 1696 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1697 return (8); /* claim the datagram. */ 1698 } 1699 1700 /* 1701 * PIM sparse mode hook 1702 * Receives the pim control messages, and passes them up to the listening 1703 * socket, using rip6_input. 1704 * The only message processed is the REGISTER pim message; the pim header 1705 * is stripped off, and the inner packet is passed to register_mforward. 1706 */ 1707 static int 1708 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused) 1709 { 1710 struct pim *pim; /* pointer to a pim struct */ 1711 struct ip6_hdr *ip6; 1712 int pimlen; 1713 int minlen; 1714 1715 PIM6STAT_INC(pim6s_rcv_total); 1716 1717 /* 1718 * Validate lengths 1719 */ 1720 pimlen = m->m_pkthdr.len - off; 1721 if (pimlen < PIM_MINLEN) { 1722 PIM6STAT_INC(pim6s_rcv_tooshort); 1723 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1724 m_freem(m); 1725 return (IPPROTO_DONE); 1726 } 1727 1728 /* 1729 * if the packet is at least as big as a REGISTER, go ahead 1730 * and grab the PIM REGISTER header size, to avoid another 1731 * possible m_pullup() later. 1732 * 1733 * PIM_MINLEN == pimhdr + u_int32 == 8 1734 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1735 */ 1736 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1737 1738 /* 1739 * Make sure that the IP6 and PIM headers in contiguous memory, and 1740 * possibly the PIM REGISTER header 1741 */ 1742 if (m->m_len < off + minlen) { 1743 m = m_pullup(m, off + minlen); 1744 if (m == NULL) { 1745 IP6STAT_INC(ip6s_exthdrtoolong); 1746 return (IPPROTO_DONE); 1747 } 1748 } 1749 ip6 = mtod(m, struct ip6_hdr *); 1750 pim = (struct pim *)((caddr_t)ip6 + off); 1751 1752 #define PIM6_CHECKSUM 1753 #ifdef PIM6_CHECKSUM 1754 { 1755 int cksumlen; 1756 1757 /* 1758 * Validate checksum. 1759 * If PIM REGISTER, exclude the data packet 1760 */ 1761 if (pim->pim_type == PIM_REGISTER) 1762 cksumlen = PIM_MINLEN; 1763 else 1764 cksumlen = pimlen; 1765 1766 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1767 PIM6STAT_INC(pim6s_rcv_badsum); 1768 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1769 m_freem(m); 1770 return (IPPROTO_DONE); 1771 } 1772 } 1773 #endif /* PIM_CHECKSUM */ 1774 1775 /* PIM version check */ 1776 if (pim->pim_ver != PIM_VERSION) { 1777 PIM6STAT_INC(pim6s_rcv_badversion); 1778 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1779 "incorrect version %d, expecting %d", 1780 pim->pim_ver, PIM_VERSION); 1781 m_freem(m); 1782 return (IPPROTO_DONE); 1783 } 1784 1785 if (pim->pim_type == PIM_REGISTER) { 1786 /* 1787 * since this is a REGISTER, we'll make a copy of the register 1788 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1789 * routing daemon. 1790 */ 1791 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1792 1793 struct mbuf *mcp; 1794 struct ip6_hdr *eip6; 1795 u_int32_t *reghdr; 1796 #ifdef MRT6DEBUG 1797 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1798 #endif 1799 1800 PIM6STAT_INC(pim6s_rcv_registers); 1801 1802 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1803 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1804 reg_mif_num); 1805 m_freem(m); 1806 return (IPPROTO_DONE); 1807 } 1808 1809 reghdr = (u_int32_t *)(pim + 1); 1810 1811 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1812 goto pim6_input_to_daemon; 1813 1814 /* 1815 * Validate length 1816 */ 1817 if (pimlen < PIM6_REG_MINLEN) { 1818 PIM6STAT_INC(pim6s_rcv_tooshort); 1819 PIM6STAT_INC(pim6s_rcv_badregisters); 1820 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1821 "size too small %d from %s", 1822 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1823 m_freem(m); 1824 return (IPPROTO_DONE); 1825 } 1826 1827 eip6 = (struct ip6_hdr *) (reghdr + 1); 1828 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1829 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1830 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1831 ntohs(eip6->ip6_plen)); 1832 1833 /* verify the version number of the inner packet */ 1834 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1835 PIM6STAT_INC(pim6s_rcv_badregisters); 1836 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1837 "of the inner packet", 1838 (eip6->ip6_vfc & IPV6_VERSION)); 1839 m_freem(m); 1840 return (IPPROTO_DONE); 1841 } 1842 1843 /* verify the inner packet is destined to a mcast group */ 1844 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1845 PIM6STAT_INC(pim6s_rcv_badregisters); 1846 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1847 "is not multicast %s", 1848 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1849 m_freem(m); 1850 return (IPPROTO_DONE); 1851 } 1852 1853 /* 1854 * make a copy of the whole header to pass to the daemon later. 1855 */ 1856 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT); 1857 if (mcp == NULL) { 1858 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1859 "could not copy register head"); 1860 m_freem(m); 1861 return (IPPROTO_DONE); 1862 } 1863 1864 /* 1865 * forward the inner ip6 packet; point m_data at the inner ip6. 1866 */ 1867 m_adj(m, off + PIM_MINLEN); 1868 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1869 "src %s, dst %s, mif %d", 1870 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1871 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1872 1873 if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1874 dst.sin6_family, 0); 1875 1876 /* prepare the register head to send to the mrouting daemon */ 1877 m = mcp; 1878 } 1879 1880 /* 1881 * Pass the PIM message up to the daemon; if it is a register message 1882 * pass the 'head' only up to the daemon. This includes the 1883 * encapsulator ip6 header, pim header, register header and the 1884 * encapsulated ip6 header. 1885 */ 1886 pim6_input_to_daemon: 1887 return (rip6_input(&m, &off, proto)); 1888 } 1889 1890 static int 1891 ip6_mroute_modevent(module_t mod, int type, void *unused) 1892 { 1893 1894 switch (type) { 1895 case MOD_LOAD: 1896 MROUTER6_LOCK_INIT(); 1897 MFC6_LOCK_INIT(); 1898 MIF6_LOCK_INIT(); 1899 1900 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg, 1901 NULL, M_WAITOK); 1902 if (pim6_encap_cookie == NULL) { 1903 printf("ip6_mroute: unable to attach pim6 encap\n"); 1904 MIF6_LOCK_DESTROY(); 1905 MFC6_LOCK_DESTROY(); 1906 MROUTER6_LOCK_DESTROY(); 1907 return (EINVAL); 1908 } 1909 1910 ip6_mforward = X_ip6_mforward; 1911 ip6_mrouter_done = X_ip6_mrouter_done; 1912 ip6_mrouter_get = X_ip6_mrouter_get; 1913 ip6_mrouter_set = X_ip6_mrouter_set; 1914 mrt6_ioctl = X_mrt6_ioctl; 1915 break; 1916 1917 case MOD_UNLOAD: 1918 if (V_ip6_mrouter != NULL) 1919 return EINVAL; 1920 1921 if (pim6_encap_cookie) { 1922 ip6_encap_detach(pim6_encap_cookie); 1923 pim6_encap_cookie = NULL; 1924 } 1925 X_ip6_mrouter_done(); 1926 ip6_mforward = NULL; 1927 ip6_mrouter_done = NULL; 1928 ip6_mrouter_get = NULL; 1929 ip6_mrouter_set = NULL; 1930 mrt6_ioctl = NULL; 1931 1932 MIF6_LOCK_DESTROY(); 1933 MFC6_LOCK_DESTROY(); 1934 MROUTER6_LOCK_DESTROY(); 1935 break; 1936 1937 default: 1938 return (EOPNOTSUPP); 1939 } 1940 1941 return (0); 1942 } 1943 1944 static moduledata_t ip6_mroutemod = { 1945 "ip6_mroute", 1946 ip6_mroute_modevent, 1947 0 1948 }; 1949 1950 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY); 1951