ip6_mroute.c revision 331722
1/*- 2 * Copyright (C) 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ 30 */ 31 32/*- 33 * Copyright (c) 1989 Stephen Deering 34 * Copyright (c) 1992, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * Stephen Deering of Stanford University. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 65 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp 66 */ 67 68/* 69 * IP multicast forwarding procedures 70 * 71 * Written by David Waitzman, BBN Labs, August 1988. 72 * Modified by Steve Deering, Stanford, February 1989. 73 * Modified by Mark J. Steiglitz, Stanford, May, 1991 74 * Modified by Van Jacobson, LBL, January 1993 75 * Modified by Ajit Thyagarajan, PARC, August 1993 76 * Modified by Bill Fenner, PARC, April 1994 77 * 78 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 79 */ 80 81#include <sys/cdefs.h> 82__FBSDID("$FreeBSD: stable/11/sys/netinet6/ip6_mroute.c 331722 2018-03-29 02:50:57Z eadler $"); 83 84#include "opt_inet6.h" 85 86#include <sys/param.h> 87#include <sys/callout.h> 88#include <sys/errno.h> 89#include <sys/kernel.h> 90#include <sys/lock.h> 91#include <sys/malloc.h> 92#include <sys/mbuf.h> 93#include <sys/module.h> 94#include <sys/domain.h> 95#include <sys/protosw.h> 96#include <sys/sdt.h> 97#include <sys/signalvar.h> 98#include <sys/socket.h> 99#include <sys/socketvar.h> 100#include <sys/sockio.h> 101#include <sys/sx.h> 102#include <sys/sysctl.h> 103#include <sys/syslog.h> 104#include <sys/systm.h> 105#include <sys/time.h> 106 107#include <net/if.h> 108#include <net/if_var.h> 109#include <net/if_types.h> 110#include <net/raw_cb.h> 111#include <net/vnet.h> 112 113#include <netinet/in.h> 114#include <netinet/in_var.h> 115#include <netinet/icmp6.h> 116#include <netinet/ip_encap.h> 117 118#include <netinet/ip6.h> 119#include <netinet/in_kdtrace.h> 120#include <netinet6/ip6_var.h> 121#include <netinet6/scope6_var.h> 122#include <netinet6/nd6.h> 123#include <netinet6/ip6_mroute.h> 124#include <netinet6/pim6.h> 125#include <netinet6/pim6_var.h> 126 127static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 128 129static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 130static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 131static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 132static int set_pim6(int *); 133static int socket_send(struct socket *, struct mbuf *, 134 struct sockaddr_in6 *); 135 136extern int in6_mcast_loop; 137extern struct domain inet6domain; 138 139static const struct encaptab *pim6_encap_cookie; 140static const struct protosw in6_pim_protosw = { 141 .pr_type = SOCK_RAW, 142 .pr_domain = &inet6domain, 143 .pr_protocol = IPPROTO_PIM, 144 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 145 .pr_input = pim6_input, 146 .pr_output = rip6_output, 147 .pr_ctloutput = rip6_ctloutput, 148 .pr_usrreqs = &rip6_usrreqs 149}; 150static int pim6_encapcheck(const struct mbuf *, int, int, void *); 151 152static VNET_DEFINE(int, ip6_mrouter_ver) = 0; 153#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 154 155SYSCTL_DECL(_net_inet6); 156SYSCTL_DECL(_net_inet6_ip6); 157static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 158 159static struct mrt6stat mrt6stat; 160SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 161 &mrt6stat, mrt6stat, 162 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 163 164#define MRT6STAT_INC(name) mrt6stat.name += 1 165#define NO_RTE_FOUND 0x1 166#define RTE_FOUND 0x2 167 168static struct mtx mrouter6_mtx; 169#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 170#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 171#define MROUTER6_LOCK_ASSERT() do { \ 172 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 173 NET_ASSERT_GIANT(); \ 174} while (0) 175#define MROUTER6_LOCK_INIT() \ 176 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 177#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 178 179static struct mf6c *mf6ctable[MF6CTBLSIZ]; 180SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 181 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 182 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 183 "netinet6/ip6_mroute.h)"); 184 185static struct mtx mfc6_mtx; 186#define MFC6_LOCK() mtx_lock(&mfc6_mtx) 187#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 188#define MFC6_LOCK_ASSERT() do { \ 189 mtx_assert(&mfc6_mtx, MA_OWNED); \ 190 NET_ASSERT_GIANT(); \ 191} while (0) 192#define MFC6_LOCK_INIT() \ 193 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 194#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 195 196static u_char n6expire[MF6CTBLSIZ]; 197 198static struct mif6 mif6table[MAXMIFS]; 199static int 200sysctl_mif6table(SYSCTL_HANDLER_ARGS) 201{ 202 struct mif6_sctl *out; 203 int error; 204 205 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, M_WAITOK); 206 for (int i = 0; i < MAXMIFS; i++) { 207 out[i].m6_flags = mif6table[i].m6_flags; 208 out[i].m6_rate_limit = mif6table[i].m6_rate_limit; 209 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr; 210 if (mif6table[i].m6_ifp != NULL) 211 out[i].m6_ifp = mif6table[i].m6_ifp->if_index; 212 else 213 out[i].m6_ifp = 0; 214 out[i].m6_pkt_in = mif6table[i].m6_pkt_in; 215 out[i].m6_pkt_out = mif6table[i].m6_pkt_out; 216 out[i].m6_bytes_in = mif6table[i].m6_bytes_in; 217 out[i].m6_bytes_out = mif6table[i].m6_bytes_out; 218 } 219 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS); 220 free(out, M_TEMP); 221 return (error); 222} 223SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, CTLTYPE_OPAQUE | CTLFLAG_RD, 224 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]", 225 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], " 226 "netinet6/ip6_mroute.h)"); 227 228static struct mtx mif6_mtx; 229#define MIF6_LOCK() mtx_lock(&mif6_mtx) 230#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 231#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 232#define MIF6_LOCK_INIT() \ 233 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 234#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 235 236#ifdef MRT6DEBUG 237static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */ 238#define V_mrt6debug VNET(mrt6debug) 239#define DEBUG_MFC 0x02 240#define DEBUG_FORWARD 0x04 241#define DEBUG_EXPIRE 0x08 242#define DEBUG_XMIT 0x10 243#define DEBUG_REG 0x20 244#define DEBUG_PIM 0x40 245#define DEBUG_ERR 0x80 246#define DEBUG_ANY 0x7f 247#define MRT6_DLOG(m, fmt, ...) \ 248 if (V_mrt6debug & (m)) \ 249 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 250 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 251#else 252#define MRT6_DLOG(m, fmt, ...) 253#endif 254 255static void expire_upcalls(void *); 256#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 257#define UPCALL_EXPIRE 6 /* number of timeouts */ 258 259/* 260 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 261 */ 262 263/* 264 * 'Interfaces' associated with decapsulator (so we can tell 265 * packets that went through it from ones that get reflected 266 * by a broken gateway). Different from IPv4 register_if, 267 * these interfaces are linked into the system ifnet list, 268 * because per-interface IPv6 statistics are maintained in 269 * ifp->if_afdata. But it does not have any routes point 270 * to them. I.e., packets can't be sent this way. They 271 * only exist as a placeholder for multicast source 272 * verification. 273 */ 274static struct ifnet *multicast_register_if6; 275 276#define ENCAP_HOPS 64 277 278/* 279 * Private variables. 280 */ 281static mifi_t nummifs = 0; 282static mifi_t reg_mif_num = (mifi_t)-1; 283 284static struct pim6stat pim6stat; 285SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 286 &pim6stat, pim6stat, 287 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 288 289#define PIM6STAT_INC(name) pim6stat.name += 1 290static VNET_DEFINE(int, pim6); 291#define V_pim6 VNET(pim6) 292 293/* 294 * Hash function for a source, group entry 295 */ 296#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 297 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 298 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 299 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 300 301/* 302 * Find a route for a given origin IPv6 address and Multicast group address. 303 */ 304#define MF6CFIND(o, g, rt) do { \ 305 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 306 rt = NULL; \ 307 while (_rt) { \ 308 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 309 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 310 (_rt->mf6c_stall == NULL)) { \ 311 rt = _rt; \ 312 break; \ 313 } \ 314 _rt = _rt->mf6c_next; \ 315 } \ 316 if (rt == NULL) { \ 317 MRT6STAT_INC(mrt6s_mfc_misses); \ 318 } \ 319} while (/*CONSTCOND*/ 0) 320 321/* 322 * Macros to compute elapsed time efficiently 323 * Borrowed from Van Jacobson's scheduling code 324 * XXX: replace with timersub() ? 325 */ 326#define TV_DELTA(a, b, delta) do { \ 327 int xxs; \ 328 \ 329 delta = (a).tv_usec - (b).tv_usec; \ 330 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 331 switch (xxs) { \ 332 case 2: \ 333 delta += 1000000; \ 334 /* FALLTHROUGH */ \ 335 case 1: \ 336 delta += 1000000; \ 337 break; \ 338 default: \ 339 delta += (1000000 * xxs); \ 340 } \ 341 } \ 342} while (/*CONSTCOND*/ 0) 343 344/* XXX: replace with timercmp(a, b, <) ? */ 345#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 346 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 347 348#ifdef UPCALL_TIMING 349#define UPCALL_MAX 50 350static u_long upcall_data[UPCALL_MAX + 1]; 351static void collate(); 352#endif /* UPCALL_TIMING */ 353 354static int ip6_mrouter_init(struct socket *, int, int); 355static int add_m6fc(struct mf6cctl *); 356static int add_m6if(struct mif6ctl *); 357static int del_m6fc(struct mf6cctl *); 358static int del_m6if(mifi_t *); 359static int del_m6if_locked(mifi_t *); 360static int get_mif6_cnt(struct sioc_mif_req6 *); 361static int get_sg_cnt(struct sioc_sg_req6 *); 362 363static struct callout expire_upcalls_ch; 364 365int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 366int X_ip6_mrouter_done(void); 367int X_ip6_mrouter_set(struct socket *, struct sockopt *); 368int X_ip6_mrouter_get(struct socket *, struct sockopt *); 369int X_mrt6_ioctl(u_long, caddr_t); 370 371/* 372 * Handle MRT setsockopt commands to modify the multicast routing tables. 373 */ 374int 375X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 376{ 377 int error = 0; 378 int optval; 379 struct mif6ctl mifc; 380 struct mf6cctl mfcc; 381 mifi_t mifi; 382 383 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 384 return (EPERM); 385 386 switch (sopt->sopt_name) { 387 case MRT6_INIT: 388#ifdef MRT6_OINIT 389 case MRT6_OINIT: 390#endif 391 error = sooptcopyin(sopt, &optval, sizeof(optval), 392 sizeof(optval)); 393 if (error) 394 break; 395 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 396 break; 397 case MRT6_DONE: 398 error = X_ip6_mrouter_done(); 399 break; 400 case MRT6_ADD_MIF: 401 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 402 if (error) 403 break; 404 error = add_m6if(&mifc); 405 break; 406 case MRT6_ADD_MFC: 407 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 408 if (error) 409 break; 410 error = add_m6fc(&mfcc); 411 break; 412 case MRT6_DEL_MFC: 413 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 414 if (error) 415 break; 416 error = del_m6fc(&mfcc); 417 break; 418 case MRT6_DEL_MIF: 419 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 420 if (error) 421 break; 422 error = del_m6if(&mifi); 423 break; 424 case MRT6_PIM: 425 error = sooptcopyin(sopt, &optval, sizeof(optval), 426 sizeof(optval)); 427 if (error) 428 break; 429 error = set_pim6(&optval); 430 break; 431 default: 432 error = EOPNOTSUPP; 433 break; 434 } 435 436 return (error); 437} 438 439/* 440 * Handle MRT getsockopt commands 441 */ 442int 443X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 444{ 445 int error = 0; 446 447 if (so != V_ip6_mrouter) 448 return (EACCES); 449 450 switch (sopt->sopt_name) { 451 case MRT6_PIM: 452 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 453 break; 454 } 455 return (error); 456} 457 458/* 459 * Handle ioctl commands to obtain information from the cache 460 */ 461int 462X_mrt6_ioctl(u_long cmd, caddr_t data) 463{ 464 int ret; 465 466 ret = EINVAL; 467 468 switch (cmd) { 469 case SIOCGETSGCNT_IN6: 470 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 471 break; 472 473 case SIOCGETMIFCNT_IN6: 474 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 475 break; 476 477 default: 478 break; 479 } 480 481 return (ret); 482} 483 484/* 485 * returns the packet, byte, rpf-failure count for the source group provided 486 */ 487static int 488get_sg_cnt(struct sioc_sg_req6 *req) 489{ 490 struct mf6c *rt; 491 int ret; 492 493 ret = 0; 494 495 MFC6_LOCK(); 496 497 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 498 if (rt == NULL) { 499 ret = ESRCH; 500 } else { 501 req->pktcnt = rt->mf6c_pkt_cnt; 502 req->bytecnt = rt->mf6c_byte_cnt; 503 req->wrong_if = rt->mf6c_wrong_if; 504 } 505 506 MFC6_UNLOCK(); 507 508 return (ret); 509} 510 511/* 512 * returns the input and output packet and byte counts on the mif provided 513 */ 514static int 515get_mif6_cnt(struct sioc_mif_req6 *req) 516{ 517 mifi_t mifi; 518 int ret; 519 520 ret = 0; 521 mifi = req->mifi; 522 523 MIF6_LOCK(); 524 525 if (mifi >= nummifs) { 526 ret = EINVAL; 527 } else { 528 req->icount = mif6table[mifi].m6_pkt_in; 529 req->ocount = mif6table[mifi].m6_pkt_out; 530 req->ibytes = mif6table[mifi].m6_bytes_in; 531 req->obytes = mif6table[mifi].m6_bytes_out; 532 } 533 534 MIF6_UNLOCK(); 535 536 return (ret); 537} 538 539static int 540set_pim6(int *i) 541{ 542 if ((*i != 1) && (*i != 0)) 543 return (EINVAL); 544 545 V_pim6 = *i; 546 547 return (0); 548} 549 550/* 551 * Enable multicast routing 552 */ 553static int 554ip6_mrouter_init(struct socket *so, int v, int cmd) 555{ 556 557 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 558 so->so_type, so->so_proto->pr_protocol); 559 560 if (so->so_type != SOCK_RAW || 561 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 562 return (EOPNOTSUPP); 563 564 if (v != 1) 565 return (ENOPROTOOPT); 566 567 MROUTER6_LOCK(); 568 569 if (V_ip6_mrouter != NULL) { 570 MROUTER6_UNLOCK(); 571 return (EADDRINUSE); 572 } 573 574 V_ip6_mrouter = so; 575 V_ip6_mrouter_ver = cmd; 576 577 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 578 bzero((caddr_t)n6expire, sizeof(n6expire)); 579 580 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 581 582 callout_init(&expire_upcalls_ch, 0); 583 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 584 expire_upcalls, NULL); 585 586 MROUTER6_UNLOCK(); 587 MRT6_DLOG(DEBUG_ANY, "finished"); 588 589 return (0); 590} 591 592/* 593 * Disable IPv6 multicast forwarding. 594 */ 595int 596X_ip6_mrouter_done(void) 597{ 598 mifi_t mifi; 599 u_long i; 600 struct mf6c *rt; 601 struct rtdetq *rte; 602 603 MROUTER6_LOCK(); 604 605 if (V_ip6_mrouter == NULL) { 606 MROUTER6_UNLOCK(); 607 return (EINVAL); 608 } 609 610 /* 611 * For each phyint in use, disable promiscuous reception of all IPv6 612 * multicasts. 613 */ 614 for (mifi = 0; mifi < nummifs; mifi++) { 615 if (mif6table[mifi].m6_ifp && 616 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 617 if_allmulti(mif6table[mifi].m6_ifp, 0); 618 } 619 } 620 bzero((caddr_t)mif6table, sizeof(mif6table)); 621 nummifs = 0; 622 623 V_pim6 = 0; /* used to stub out/in pim specific code */ 624 625 callout_stop(&expire_upcalls_ch); 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 /* 652 * Reset register interface 653 */ 654 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 655 if_detach(multicast_register_if6); 656 if_free(multicast_register_if6); 657 reg_mif_num = (mifi_t)-1; 658 multicast_register_if6 = NULL; 659 } 660 661 V_ip6_mrouter = NULL; 662 V_ip6_mrouter_ver = 0; 663 664 MROUTER6_UNLOCK(); 665 MRT6_DLOG(DEBUG_ANY, "finished"); 666 667 return (0); 668} 669 670static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 671 672/* 673 * Add a mif to the mif table 674 */ 675static int 676add_m6if(struct mif6ctl *mifcp) 677{ 678 struct mif6 *mifp; 679 struct ifnet *ifp; 680 int error; 681 682 MIF6_LOCK(); 683 684 if (mifcp->mif6c_mifi >= MAXMIFS) { 685 MIF6_UNLOCK(); 686 return (EINVAL); 687 } 688 mifp = mif6table + mifcp->mif6c_mifi; 689 if (mifp->m6_ifp != NULL) { 690 MIF6_UNLOCK(); 691 return (EADDRINUSE); /* XXX: is it appropriate? */ 692 } 693 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 694 MIF6_UNLOCK(); 695 return (ENXIO); 696 } 697 698 ifp = ifnet_byindex(mifcp->mif6c_pifi); 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 */ 755static int 756del_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 795static int 796del_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 */ 810static int 811add_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)) { 849 850 if (nstl++) 851 log(LOG_ERR, 852 "add_m6fc: %s o %s g %s p %x dbx %p\n", 853 "multiple kernel entries", 854 ip6_sprintf(ip6bufo, 855 &mfccp->mf6cc_origin.sin6_addr), 856 ip6_sprintf(ip6bufg, 857 &mfccp->mf6cc_mcastgrp.sin6_addr), 858 mfccp->mf6cc_parent, rt->mf6c_stall); 859 860 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 861 ip6_sprintf(ip6bufo, 862 &mfccp->mf6cc_origin.sin6_addr), 863 ip6_sprintf(ip6bufg, 864 &mfccp->mf6cc_mcastgrp.sin6_addr), 865 mfccp->mf6cc_parent, rt->mf6c_stall); 866 867 rt->mf6c_origin = mfccp->mf6cc_origin; 868 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 869 rt->mf6c_parent = mfccp->mf6cc_parent; 870 rt->mf6c_ifset = mfccp->mf6cc_ifset; 871 /* initialize pkt counters per src-grp */ 872 rt->mf6c_pkt_cnt = 0; 873 rt->mf6c_byte_cnt = 0; 874 rt->mf6c_wrong_if = 0; 875 876 rt->mf6c_expire = 0; /* Don't clean this guy up */ 877 n6expire[hash]--; 878 879 /* free packets Qed at the end of this entry */ 880 for (rte = rt->mf6c_stall; rte != NULL; ) { 881 struct rtdetq *n = rte->next; 882 ip6_mdq(rte->m, rte->ifp, rt); 883 m_freem(rte->m); 884#ifdef UPCALL_TIMING 885 collate(&(rte->t)); 886#endif /* UPCALL_TIMING */ 887 free(rte, M_MRTABLE6); 888 rte = n; 889 } 890 rt->mf6c_stall = NULL; 891 } 892 } 893 894 /* 895 * It is possible that an entry is being inserted without an upcall 896 */ 897 if (nstl == 0) { 898 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 899 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 900 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 901 mfccp->mf6cc_parent); 902 903 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 904 905 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 906 &mfccp->mf6cc_origin.sin6_addr)&& 907 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 908 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 909 910 rt->mf6c_origin = mfccp->mf6cc_origin; 911 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 912 rt->mf6c_parent = mfccp->mf6cc_parent; 913 rt->mf6c_ifset = mfccp->mf6cc_ifset; 914 /* initialize pkt counters per src-grp */ 915 rt->mf6c_pkt_cnt = 0; 916 rt->mf6c_byte_cnt = 0; 917 rt->mf6c_wrong_if = 0; 918 919 if (rt->mf6c_expire) 920 n6expire[hash]--; 921 rt->mf6c_expire = 0; 922 } 923 } 924 if (rt == NULL) { 925 /* no upcall, so make a new entry */ 926 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 927 M_NOWAIT); 928 if (rt == NULL) { 929 MFC6_UNLOCK(); 930 return (ENOBUFS); 931 } 932 933 /* insert new entry at head of hash chain */ 934 rt->mf6c_origin = mfccp->mf6cc_origin; 935 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 936 rt->mf6c_parent = mfccp->mf6cc_parent; 937 rt->mf6c_ifset = mfccp->mf6cc_ifset; 938 /* initialize pkt counters per src-grp */ 939 rt->mf6c_pkt_cnt = 0; 940 rt->mf6c_byte_cnt = 0; 941 rt->mf6c_wrong_if = 0; 942 rt->mf6c_expire = 0; 943 rt->mf6c_stall = NULL; 944 945 /* link into table */ 946 rt->mf6c_next = mf6ctable[hash]; 947 mf6ctable[hash] = rt; 948 } 949 } 950 951 MFC6_UNLOCK(); 952 return (0); 953} 954 955#ifdef UPCALL_TIMING 956/* 957 * collect delay statistics on the upcalls 958 */ 959static void 960collate(struct timeval *t) 961{ 962 u_long d; 963 struct timeval tp; 964 u_long delta; 965 966 GET_TIME(tp); 967 968 if (TV_LT(*t, tp)) 969 { 970 TV_DELTA(tp, *t, delta); 971 972 d = delta >> 10; 973 if (d > UPCALL_MAX) 974 d = UPCALL_MAX; 975 976 ++upcall_data[d]; 977 } 978} 979#endif /* UPCALL_TIMING */ 980 981/* 982 * Delete an mfc entry 983 */ 984static int 985del_m6fc(struct mf6cctl *mfccp) 986{ 987#ifdef MRT6DEBUG 988 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 989#endif 990 struct sockaddr_in6 origin; 991 struct sockaddr_in6 mcastgrp; 992 struct mf6c *rt; 993 struct mf6c **nptr; 994 u_long hash; 995 996 origin = mfccp->mf6cc_origin; 997 mcastgrp = mfccp->mf6cc_mcastgrp; 998 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 999 1000 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 1001 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1002 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1003 1004 MFC6_LOCK(); 1005 1006 nptr = &mf6ctable[hash]; 1007 while ((rt = *nptr) != NULL) { 1008 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1009 &rt->mf6c_origin.sin6_addr) && 1010 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1011 &rt->mf6c_mcastgrp.sin6_addr) && 1012 rt->mf6c_stall == NULL) 1013 break; 1014 1015 nptr = &rt->mf6c_next; 1016 } 1017 if (rt == NULL) { 1018 MFC6_UNLOCK(); 1019 return (EADDRNOTAVAIL); 1020 } 1021 1022 *nptr = rt->mf6c_next; 1023 free(rt, M_MRTABLE6); 1024 1025 MFC6_UNLOCK(); 1026 1027 return (0); 1028} 1029 1030static int 1031socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1032{ 1033 1034 if (s) { 1035 if (sbappendaddr(&s->so_rcv, 1036 (struct sockaddr *)src, 1037 mm, (struct mbuf *)0) != 0) { 1038 sorwakeup(s); 1039 return (0); 1040 } 1041 } 1042 m_freem(mm); 1043 return (-1); 1044} 1045 1046/* 1047 * IPv6 multicast forwarding function. This function assumes that the packet 1048 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1049 * pointed to by "ifp", and the packet is to be relayed to other networks 1050 * that have members of the packet's destination IPv6 multicast group. 1051 * 1052 * The packet is returned unscathed to the caller, unless it is 1053 * erroneous, in which case a non-zero return value tells the caller to 1054 * discard it. 1055 * 1056 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1057 * this function is called in the originating context (i.e., not when 1058 * forwarding a packet from other node). ip6_output(), which is currently the 1059 * only function that calls this function is called in the originating context, 1060 * explicitly ensures this condition. It is caller's responsibility to ensure 1061 * that if this function is called from somewhere else in the originating 1062 * context in the future. 1063 */ 1064int 1065X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1066{ 1067 struct rtdetq *rte; 1068 struct mbuf *mb0; 1069 struct mf6c *rt; 1070 struct mif6 *mifp; 1071 struct mbuf *mm; 1072 u_long hash; 1073 mifi_t mifi; 1074 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1075#ifdef UPCALL_TIMING 1076 struct timeval tp; 1077 1078 GET_TIME(tp); 1079#endif /* UPCALL_TIMING */ 1080 1081 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1082 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1083 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1084 1085 /* 1086 * Don't forward a packet with Hop limit of zero or one, 1087 * or a packet destined to a local-only group. 1088 */ 1089 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1090 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1091 return (0); 1092 ip6->ip6_hlim--; 1093 1094 /* 1095 * Source address check: do not forward packets with unspecified 1096 * source. It was discussed in July 2000, on ipngwg mailing list. 1097 * This is rather more serious than unicast cases, because some 1098 * MLD packets can be sent with the unspecified source address 1099 * (although such packets must normally set 1 to the hop limit field). 1100 */ 1101 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1102 IP6STAT_INC(ip6s_cantforward); 1103 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1104 V_ip6_log_time = time_uptime; 1105 log(LOG_DEBUG, 1106 "cannot forward " 1107 "from %s to %s nxt %d received on %s\n", 1108 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1109 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1110 ip6->ip6_nxt, 1111 if_name(m->m_pkthdr.rcvif)); 1112 } 1113 return (0); 1114 } 1115 1116 MFC6_LOCK(); 1117 1118 /* 1119 * Determine forwarding mifs from the forwarding cache table 1120 */ 1121 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1122 MRT6STAT_INC(mrt6s_mfc_lookups); 1123 1124 /* Entry exists, so forward if necessary */ 1125 if (rt) { 1126 MFC6_UNLOCK(); 1127 return (ip6_mdq(m, ifp, rt)); 1128 } 1129 1130 /* 1131 * If we don't have a route for packet's origin, 1132 * Make a copy of the packet & send message to routing daemon. 1133 */ 1134 MRT6STAT_INC(mrt6s_no_route); 1135 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1136 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1137 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1138 1139 /* 1140 * Allocate mbufs early so that we don't do extra work if we 1141 * are just going to fail anyway. 1142 */ 1143 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1144 if (rte == NULL) { 1145 MFC6_UNLOCK(); 1146 return (ENOBUFS); 1147 } 1148 mb0 = m_copy(m, 0, M_COPYALL); 1149 /* 1150 * Pullup packet header if needed before storing it, 1151 * as other references may modify it in the meantime. 1152 */ 1153 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1154 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1155 if (mb0 == NULL) { 1156 free(rte, M_MRTABLE6); 1157 MFC6_UNLOCK(); 1158 return (ENOBUFS); 1159 } 1160 1161 /* is there an upcall waiting for this packet? */ 1162 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1163 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1164 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1165 &rt->mf6c_origin.sin6_addr) && 1166 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1167 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1168 break; 1169 } 1170 1171 if (rt == NULL) { 1172 struct mrt6msg *im; 1173#ifdef MRT6_OINIT 1174 struct omrt6msg *oim; 1175#endif 1176 /* no upcall, so make a new entry */ 1177 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1178 if (rt == NULL) { 1179 free(rte, M_MRTABLE6); 1180 m_freem(mb0); 1181 MFC6_UNLOCK(); 1182 return (ENOBUFS); 1183 } 1184 /* 1185 * Make a copy of the header to send to the user 1186 * level process 1187 */ 1188 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1189 if (mm == NULL) { 1190 free(rte, M_MRTABLE6); 1191 m_freem(mb0); 1192 free(rt, M_MRTABLE6); 1193 MFC6_UNLOCK(); 1194 return (ENOBUFS); 1195 } 1196 1197 /* 1198 * Send message to routing daemon 1199 */ 1200 sin6.sin6_addr = ip6->ip6_src; 1201 im = NULL; 1202#ifdef MRT6_OINIT 1203 oim = NULL; 1204#endif 1205 switch (V_ip6_mrouter_ver) { 1206#ifdef MRT6_OINIT 1207 case MRT6_OINIT: 1208 oim = mtod(mm, struct omrt6msg *); 1209 oim->im6_msgtype = MRT6MSG_NOCACHE; 1210 oim->im6_mbz = 0; 1211 break; 1212#endif 1213 case MRT6_INIT: 1214 im = mtod(mm, struct mrt6msg *); 1215 im->im6_msgtype = MRT6MSG_NOCACHE; 1216 im->im6_mbz = 0; 1217 break; 1218 default: 1219 free(rte, M_MRTABLE6); 1220 m_freem(mb0); 1221 free(rt, M_MRTABLE6); 1222 MFC6_UNLOCK(); 1223 return (EINVAL); 1224 } 1225 1226 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1227 for (mifp = mif6table, mifi = 0; 1228 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1229 ; 1230 1231 switch (V_ip6_mrouter_ver) { 1232#ifdef MRT6_OINIT 1233 case MRT6_OINIT: 1234 oim->im6_mif = mifi; 1235 break; 1236#endif 1237 case MRT6_INIT: 1238 im->im6_mif = mifi; 1239 break; 1240 } 1241 1242 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1243 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1244 "socket queue full\n"); 1245 MRT6STAT_INC(mrt6s_upq_sockfull); 1246 free(rte, M_MRTABLE6); 1247 m_freem(mb0); 1248 free(rt, M_MRTABLE6); 1249 MFC6_UNLOCK(); 1250 return (ENOBUFS); 1251 } 1252 1253 MRT6STAT_INC(mrt6s_upcalls); 1254 1255 /* insert new entry at head of hash chain */ 1256 bzero(rt, sizeof(*rt)); 1257 rt->mf6c_origin.sin6_family = AF_INET6; 1258 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1259 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1260 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1261 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1262 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1263 rt->mf6c_expire = UPCALL_EXPIRE; 1264 n6expire[hash]++; 1265 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1266 1267 /* link into table */ 1268 rt->mf6c_next = mf6ctable[hash]; 1269 mf6ctable[hash] = rt; 1270 /* Add this entry to the end of the queue */ 1271 rt->mf6c_stall = rte; 1272 } else { 1273 /* determine if q has overflowed */ 1274 struct rtdetq **p; 1275 int npkts = 0; 1276 1277 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1278 if (++npkts > MAX_UPQ6) { 1279 MRT6STAT_INC(mrt6s_upq_ovflw); 1280 free(rte, M_MRTABLE6); 1281 m_freem(mb0); 1282 MFC6_UNLOCK(); 1283 return (0); 1284 } 1285 1286 /* Add this entry to the end of the queue */ 1287 *p = rte; 1288 } 1289 1290 rte->next = NULL; 1291 rte->m = mb0; 1292 rte->ifp = ifp; 1293#ifdef UPCALL_TIMING 1294 rte->t = tp; 1295#endif /* UPCALL_TIMING */ 1296 1297 MFC6_UNLOCK(); 1298 1299 return (0); 1300} 1301 1302/* 1303 * Clean up cache entries if upcalls are not serviced 1304 * Call from the Slow Timeout mechanism, every half second. 1305 */ 1306static void 1307expire_upcalls(void *unused) 1308{ 1309#ifdef MRT6DEBUG 1310 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1311#endif 1312 struct rtdetq *rte; 1313 struct mf6c *mfc, **nptr; 1314 u_long i; 1315 1316 MFC6_LOCK(); 1317 for (i = 0; i < MF6CTBLSIZ; i++) { 1318 if (n6expire[i] == 0) 1319 continue; 1320 nptr = &mf6ctable[i]; 1321 while ((mfc = *nptr) != NULL) { 1322 rte = mfc->mf6c_stall; 1323 /* 1324 * Skip real cache entries 1325 * Make sure it wasn't marked to not expire (shouldn't happen) 1326 * If it expires now 1327 */ 1328 if (rte != NULL && 1329 mfc->mf6c_expire != 0 && 1330 --mfc->mf6c_expire == 0) { 1331 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1332 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1333 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1334 /* 1335 * drop all the packets 1336 * free the mbuf with the pkt, if, timing info 1337 */ 1338 do { 1339 struct rtdetq *n = rte->next; 1340 m_freem(rte->m); 1341 free(rte, M_MRTABLE6); 1342 rte = n; 1343 } while (rte != NULL); 1344 MRT6STAT_INC(mrt6s_cache_cleanups); 1345 n6expire[i]--; 1346 1347 *nptr = mfc->mf6c_next; 1348 free(mfc, M_MRTABLE6); 1349 } else { 1350 nptr = &mfc->mf6c_next; 1351 } 1352 } 1353 } 1354 MFC6_UNLOCK(); 1355 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1356 expire_upcalls, NULL); 1357} 1358 1359/* 1360 * Packet forwarding routine once entry in the cache is made 1361 */ 1362static int 1363ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1364{ 1365 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1366 mifi_t mifi, iif; 1367 struct mif6 *mifp; 1368 int plen = m->m_pkthdr.len; 1369 struct in6_addr src0, dst0; /* copies for local work */ 1370 u_int32_t iszone, idzone, oszone, odzone; 1371 int error = 0; 1372 1373/* 1374 * Macro to send packet on mif. Since RSVP packets don't get counted on 1375 * input, they shouldn't get counted on output, so statistics keeping is 1376 * separate. 1377 */ 1378 1379#define MC6_SEND(ip6, mifp, m) do { \ 1380 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1381 register_send((ip6), (mifp), (m)); \ 1382 else \ 1383 phyint_send((ip6), (mifp), (m)); \ 1384} while (/*CONSTCOND*/ 0) 1385 1386 /* 1387 * Don't forward if it didn't arrive from the parent mif 1388 * for its origin. 1389 */ 1390 mifi = rt->mf6c_parent; 1391 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1392 /* came in the wrong interface */ 1393 MRT6_DLOG(DEBUG_FORWARD, 1394 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1395 mifi, mif6table[mifi].m6_ifp->if_index); 1396 MRT6STAT_INC(mrt6s_wrong_if); 1397 rt->mf6c_wrong_if++; 1398 /* 1399 * If we are doing PIM processing, and we are forwarding 1400 * packets on this interface, send a message to the 1401 * routing daemon. 1402 */ 1403 /* have to make sure this is a valid mif */ 1404 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1405 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1406 /* 1407 * Check the M_LOOP flag to avoid an 1408 * unnecessary PIM assert. 1409 * XXX: M_LOOP is an ad-hoc hack... 1410 */ 1411 static struct sockaddr_in6 sin6 = 1412 { sizeof(sin6), AF_INET6 }; 1413 1414 struct mbuf *mm; 1415 struct mrt6msg *im; 1416#ifdef MRT6_OINIT 1417 struct omrt6msg *oim; 1418#endif 1419 1420 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1421 if (mm && 1422 (!M_WRITABLE(mm) || 1423 mm->m_len < sizeof(struct ip6_hdr))) 1424 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1425 if (mm == NULL) 1426 return (ENOBUFS); 1427 1428#ifdef MRT6_OINIT 1429 oim = NULL; 1430#endif 1431 im = NULL; 1432 switch (V_ip6_mrouter_ver) { 1433#ifdef MRT6_OINIT 1434 case MRT6_OINIT: 1435 oim = mtod(mm, struct omrt6msg *); 1436 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1437 oim->im6_mbz = 0; 1438 break; 1439#endif 1440 case MRT6_INIT: 1441 im = mtod(mm, struct mrt6msg *); 1442 im->im6_msgtype = MRT6MSG_WRONGMIF; 1443 im->im6_mbz = 0; 1444 break; 1445 default: 1446 m_freem(mm); 1447 return (EINVAL); 1448 } 1449 1450 for (mifp = mif6table, iif = 0; 1451 iif < nummifs && mifp && 1452 mifp->m6_ifp != ifp; 1453 mifp++, iif++) 1454 ; 1455 1456 switch (V_ip6_mrouter_ver) { 1457#ifdef MRT6_OINIT 1458 case MRT6_OINIT: 1459 oim->im6_mif = iif; 1460 sin6.sin6_addr = oim->im6_src; 1461 break; 1462#endif 1463 case MRT6_INIT: 1464 im->im6_mif = iif; 1465 sin6.sin6_addr = im->im6_src; 1466 break; 1467 } 1468 1469 MRT6STAT_INC(mrt6s_upcalls); 1470 1471 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1472 MRT6_DLOG(DEBUG_ANY, 1473 "ip6_mrouter socket queue full"); 1474 MRT6STAT_INC(mrt6s_upq_sockfull); 1475 return (ENOBUFS); 1476 } /* if socket Q full */ 1477 } /* if PIM */ 1478 return (0); 1479 } /* if wrong iif */ 1480 1481 /* If I sourced this packet, it counts as output, else it was input. */ 1482 if (m->m_pkthdr.rcvif == NULL) { 1483 /* XXX: is rcvif really NULL when output?? */ 1484 mif6table[mifi].m6_pkt_out++; 1485 mif6table[mifi].m6_bytes_out += plen; 1486 } else { 1487 mif6table[mifi].m6_pkt_in++; 1488 mif6table[mifi].m6_bytes_in += plen; 1489 } 1490 rt->mf6c_pkt_cnt++; 1491 rt->mf6c_byte_cnt += plen; 1492 1493 /* 1494 * For each mif, forward a copy of the packet if there are group 1495 * members downstream on the interface. 1496 */ 1497 src0 = ip6->ip6_src; 1498 dst0 = ip6->ip6_dst; 1499 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1500 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1501 IP6STAT_INC(ip6s_badscope); 1502 return (error); 1503 } 1504 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1505 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1506 /* 1507 * check if the outgoing packet is going to break 1508 * a scope boundary. 1509 * XXX For packets through PIM register tunnel 1510 * interface, we believe a routing daemon. 1511 */ 1512 if (!(mif6table[rt->mf6c_parent].m6_flags & 1513 MIFF_REGISTER) && 1514 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1515 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1516 &oszone) || 1517 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1518 &odzone) || 1519 iszone != oszone || 1520 idzone != odzone) { 1521 IP6STAT_INC(ip6s_badscope); 1522 continue; 1523 } 1524 } 1525 1526 mifp->m6_pkt_out++; 1527 mifp->m6_bytes_out += plen; 1528 MC6_SEND(ip6, mifp, m); 1529 } 1530 } 1531 return (0); 1532} 1533 1534static void 1535phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1536{ 1537#ifdef MRT6DEBUG 1538 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1539#endif 1540 struct mbuf *mb_copy; 1541 struct ifnet *ifp = mifp->m6_ifp; 1542 int error = 0; 1543 u_long linkmtu; 1544 1545 /* 1546 * Make a new reference to the packet; make sure that 1547 * the IPv6 header is actually copied, not just referenced, 1548 * so that ip6_output() only scribbles on the copy. 1549 */ 1550 mb_copy = m_copy(m, 0, M_COPYALL); 1551 if (mb_copy && 1552 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1553 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1554 if (mb_copy == NULL) { 1555 return; 1556 } 1557 /* set MCAST flag to the outgoing packet */ 1558 mb_copy->m_flags |= M_MCAST; 1559 1560 /* 1561 * If we sourced the packet, call ip6_output since we may devide 1562 * the packet into fragments when the packet is too big for the 1563 * outgoing interface. 1564 * Otherwise, we can simply send the packet to the interface 1565 * sending queue. 1566 */ 1567 if (m->m_pkthdr.rcvif == NULL) { 1568 struct ip6_moptions im6o; 1569 1570 im6o.im6o_multicast_ifp = ifp; 1571 /* XXX: ip6_output will override ip6->ip6_hlim */ 1572 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1573 im6o.im6o_multicast_loop = 1; 1574 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1575 NULL, NULL); 1576 1577 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1578 (uint16_t)(mifp - mif6table), error); 1579 return; 1580 } 1581 1582 /* 1583 * If configured to loop back multicasts by default, 1584 * loop back a copy now. 1585 */ 1586 if (in6_mcast_loop) 1587 ip6_mloopback(ifp, m); 1588 1589 /* 1590 * Put the packet into the sending queue of the outgoing interface 1591 * if it would fit in the MTU of the interface. 1592 */ 1593 linkmtu = IN6_LINKMTU(ifp); 1594 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1595 struct sockaddr_in6 dst6; 1596 1597 bzero(&dst6, sizeof(dst6)); 1598 dst6.sin6_len = sizeof(struct sockaddr_in6); 1599 dst6.sin6_family = AF_INET6; 1600 dst6.sin6_addr = ip6->ip6_dst; 1601 1602 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1603 /* 1604 * We just call if_output instead of nd6_output here, since 1605 * we need no ND for a multicast forwarded packet...right? 1606 */ 1607 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1608 error = (*ifp->if_output)(ifp, mb_copy, 1609 (struct sockaddr *)&dst6, NULL); 1610 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1611 (uint16_t)(mifp - mif6table), error); 1612 } else { 1613 /* 1614 * pMTU discovery is intentionally disabled by default, since 1615 * various router may notify pMTU in multicast, which can be 1616 * a DDoS to a router 1617 */ 1618 if (V_ip6_mcast_pmtu) 1619 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1620 else { 1621 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1622 "g %s size %d (discarded)", if_name(ifp), 1623 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1624 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1625 mb_copy->m_pkthdr.len); 1626 m_freem(mb_copy); /* simply discard the packet */ 1627 } 1628 } 1629} 1630 1631static int 1632register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1633{ 1634#ifdef MRT6DEBUG 1635 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1636#endif 1637 struct mbuf *mm; 1638 int i, len = m->m_pkthdr.len; 1639 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1640 struct mrt6msg *im6; 1641 1642 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1643 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1644 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1645 PIM6STAT_INC(pim6s_snd_registers); 1646 1647 /* Make a copy of the packet to send to the user level process. */ 1648 mm = m_gethdr(M_NOWAIT, MT_DATA); 1649 if (mm == NULL) 1650 return (ENOBUFS); 1651 mm->m_data += max_linkhdr; 1652 mm->m_len = sizeof(struct ip6_hdr); 1653 1654 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1655 m_freem(mm); 1656 return (ENOBUFS); 1657 } 1658 i = MHLEN - M_LEADINGSPACE(mm); 1659 if (i > len) 1660 i = len; 1661 mm = m_pullup(mm, i); 1662 if (mm == NULL) 1663 return (ENOBUFS); 1664/* TODO: check it! */ 1665 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1666 1667 /* 1668 * Send message to routing daemon 1669 */ 1670 sin6.sin6_addr = ip6->ip6_src; 1671 1672 im6 = mtod(mm, struct mrt6msg *); 1673 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1674 im6->im6_mbz = 0; 1675 1676 im6->im6_mif = mif - mif6table; 1677 1678 /* iif info is not given for reg. encap.n */ 1679 MRT6STAT_INC(mrt6s_upcalls); 1680 1681 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1682 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1683 MRT6STAT_INC(mrt6s_upq_sockfull); 1684 return (ENOBUFS); 1685 } 1686 return (0); 1687} 1688 1689/* 1690 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1691 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1692 * into the kernel. 1693 */ 1694static int 1695pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1696{ 1697 1698#ifdef DIAGNOSTIC 1699 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1700#endif 1701 if (proto != IPPROTO_PIM) 1702 return 0; /* not for us; reject the datagram. */ 1703 1704 return 64; /* claim the datagram. */ 1705} 1706 1707/* 1708 * PIM sparse mode hook 1709 * Receives the pim control messages, and passes them up to the listening 1710 * socket, using rip6_input. 1711 * The only message processed is the REGISTER pim message; the pim header 1712 * is stripped off, and the inner packet is passed to register_mforward. 1713 */ 1714int 1715pim6_input(struct mbuf **mp, int *offp, int proto) 1716{ 1717 struct pim *pim; /* pointer to a pim struct */ 1718 struct ip6_hdr *ip6; 1719 int pimlen; 1720 struct mbuf *m = *mp; 1721 int minlen; 1722 int off = *offp; 1723 1724 PIM6STAT_INC(pim6s_rcv_total); 1725 1726 ip6 = mtod(m, struct ip6_hdr *); 1727 pimlen = m->m_pkthdr.len - *offp; 1728 1729 /* 1730 * Validate lengths 1731 */ 1732 if (pimlen < PIM_MINLEN) { 1733 PIM6STAT_INC(pim6s_rcv_tooshort); 1734 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1735 m_freem(m); 1736 return (IPPROTO_DONE); 1737 } 1738 1739 /* 1740 * if the packet is at least as big as a REGISTER, go ahead 1741 * and grab the PIM REGISTER header size, to avoid another 1742 * possible m_pullup() later. 1743 * 1744 * PIM_MINLEN == pimhdr + u_int32 == 8 1745 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1746 */ 1747 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1748 1749 /* 1750 * Make sure that the IP6 and PIM headers in contiguous memory, and 1751 * possibly the PIM REGISTER header 1752 */ 1753#ifndef PULLDOWN_TEST 1754 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1755 /* adjust pointer */ 1756 ip6 = mtod(m, struct ip6_hdr *); 1757 1758 /* adjust mbuf to point to the PIM header */ 1759 pim = (struct pim *)((caddr_t)ip6 + off); 1760#else 1761 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1762 if (pim == NULL) { 1763 PIM6STAT_INC(pim6s_rcv_tooshort); 1764 return (IPPROTO_DONE); 1765 } 1766#endif 1767 1768#define PIM6_CHECKSUM 1769#ifdef PIM6_CHECKSUM 1770 { 1771 int cksumlen; 1772 1773 /* 1774 * Validate checksum. 1775 * If PIM REGISTER, exclude the data packet 1776 */ 1777 if (pim->pim_type == PIM_REGISTER) 1778 cksumlen = PIM_MINLEN; 1779 else 1780 cksumlen = pimlen; 1781 1782 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1783 PIM6STAT_INC(pim6s_rcv_badsum); 1784 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1785 m_freem(m); 1786 return (IPPROTO_DONE); 1787 } 1788 } 1789#endif /* PIM_CHECKSUM */ 1790 1791 /* PIM version check */ 1792 if (pim->pim_ver != PIM_VERSION) { 1793 PIM6STAT_INC(pim6s_rcv_badversion); 1794 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1795 "incorrect version %d, expecting %d", 1796 pim->pim_ver, PIM_VERSION); 1797 m_freem(m); 1798 return (IPPROTO_DONE); 1799 } 1800 1801 if (pim->pim_type == PIM_REGISTER) { 1802 /* 1803 * since this is a REGISTER, we'll make a copy of the register 1804 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1805 * routing daemon. 1806 */ 1807 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1808 1809 struct mbuf *mcp; 1810 struct ip6_hdr *eip6; 1811 u_int32_t *reghdr; 1812 int rc; 1813#ifdef MRT6DEBUG 1814 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1815#endif 1816 1817 PIM6STAT_INC(pim6s_rcv_registers); 1818 1819 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1820 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1821 reg_mif_num); 1822 m_freem(m); 1823 return (IPPROTO_DONE); 1824 } 1825 1826 reghdr = (u_int32_t *)(pim + 1); 1827 1828 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1829 goto pim6_input_to_daemon; 1830 1831 /* 1832 * Validate length 1833 */ 1834 if (pimlen < PIM6_REG_MINLEN) { 1835 PIM6STAT_INC(pim6s_rcv_tooshort); 1836 PIM6STAT_INC(pim6s_rcv_badregisters); 1837 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1838 "size too small %d from %s", 1839 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1840 m_freem(m); 1841 return (IPPROTO_DONE); 1842 } 1843 1844 eip6 = (struct ip6_hdr *) (reghdr + 1); 1845 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1846 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1847 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1848 ntohs(eip6->ip6_plen)); 1849 1850 /* verify the version number of the inner packet */ 1851 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1852 PIM6STAT_INC(pim6s_rcv_badregisters); 1853 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1854 "of the inner packet", 1855 (eip6->ip6_vfc & IPV6_VERSION)); 1856 m_freem(m); 1857 return (IPPROTO_DONE); 1858 } 1859 1860 /* verify the inner packet is destined to a mcast group */ 1861 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1862 PIM6STAT_INC(pim6s_rcv_badregisters); 1863 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1864 "is not multicast %s", 1865 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1866 m_freem(m); 1867 return (IPPROTO_DONE); 1868 } 1869 1870 /* 1871 * make a copy of the whole header to pass to the daemon later. 1872 */ 1873 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1874 if (mcp == NULL) { 1875 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1876 "could not copy register head"); 1877 m_freem(m); 1878 return (IPPROTO_DONE); 1879 } 1880 1881 /* 1882 * forward the inner ip6 packet; point m_data at the inner ip6. 1883 */ 1884 m_adj(m, off + PIM_MINLEN); 1885 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1886 "src %s, dst %s, mif %d", 1887 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1888 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1889 1890 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1891 dst.sin6_family, 0); 1892 1893 /* prepare the register head to send to the mrouting daemon */ 1894 m = mcp; 1895 } 1896 1897 /* 1898 * Pass the PIM message up to the daemon; if it is a register message 1899 * pass the 'head' only up to the daemon. This includes the 1900 * encapsulator ip6 header, pim header, register header and the 1901 * encapsulated ip6 header. 1902 */ 1903 pim6_input_to_daemon: 1904 rip6_input(&m, offp, proto); 1905 return (IPPROTO_DONE); 1906} 1907 1908static int 1909ip6_mroute_modevent(module_t mod, int type, void *unused) 1910{ 1911 1912 switch (type) { 1913 case MOD_LOAD: 1914 MROUTER6_LOCK_INIT(); 1915 MFC6_LOCK_INIT(); 1916 MIF6_LOCK_INIT(); 1917 1918 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 1919 pim6_encapcheck, 1920 (const struct protosw *)&in6_pim_protosw, NULL); 1921 if (pim6_encap_cookie == NULL) { 1922 printf("ip6_mroute: unable to attach pim6 encap\n"); 1923 MIF6_LOCK_DESTROY(); 1924 MFC6_LOCK_DESTROY(); 1925 MROUTER6_LOCK_DESTROY(); 1926 return (EINVAL); 1927 } 1928 1929 ip6_mforward = X_ip6_mforward; 1930 ip6_mrouter_done = X_ip6_mrouter_done; 1931 ip6_mrouter_get = X_ip6_mrouter_get; 1932 ip6_mrouter_set = X_ip6_mrouter_set; 1933 mrt6_ioctl = X_mrt6_ioctl; 1934 break; 1935 1936 case MOD_UNLOAD: 1937 if (V_ip6_mrouter != NULL) 1938 return EINVAL; 1939 1940 if (pim6_encap_cookie) { 1941 encap_detach(pim6_encap_cookie); 1942 pim6_encap_cookie = NULL; 1943 } 1944 X_ip6_mrouter_done(); 1945 ip6_mforward = NULL; 1946 ip6_mrouter_done = NULL; 1947 ip6_mrouter_get = NULL; 1948 ip6_mrouter_set = NULL; 1949 mrt6_ioctl = NULL; 1950 1951 MIF6_LOCK_DESTROY(); 1952 MFC6_LOCK_DESTROY(); 1953 MROUTER6_LOCK_DESTROY(); 1954 break; 1955 1956 default: 1957 return (EOPNOTSUPP); 1958 } 1959 1960 return (0); 1961} 1962 1963static moduledata_t ip6_mroutemod = { 1964 "ip6_mroute", 1965 ip6_mroute_modevent, 1966 0 1967}; 1968 1969DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY); 1970