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>
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82__FBSDID("$FreeBSD: head/sys/netinet6/ip6_mroute.c 190012 2009-03-19 01:43:03Z bms $");
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82__FBSDID("$FreeBSD: head/sys/netinet6/ip6_mroute.c 191672 2009-04-29 19:19:13Z bms $"); |
83 84#include "opt_inet.h" 85#include "opt_inet6.h" 86#include "opt_route.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>
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96#include <sys/domain.h> |
97#include <sys/protosw.h> 98#include <sys/signalvar.h> 99#include <sys/socket.h> 100#include <sys/socketvar.h> 101#include <sys/sockio.h> 102#include <sys/sx.h> 103#include <sys/sysctl.h> 104#include <sys/syslog.h> 105#include <sys/systm.h> 106#include <sys/time.h> 107#include <sys/vimage.h> 108 109#include <net/if.h> 110#include <net/if_types.h> 111#include <net/raw_cb.h> 112#include <net/route.h> 113#include <net/vnet.h> 114 115#include <netinet/in.h> 116#include <netinet/in_var.h> 117#include <netinet/icmp6.h> 118#include <netinet/vinet.h> 119#include <netinet/ip_encap.h> 120 121#include <netinet/ip6.h> 122#include <netinet6/ip6_var.h> 123#include <netinet6/scope6_var.h> 124#include <netinet6/nd6.h> 125#include <netinet6/ip6_mroute.h> 126#include <netinet6/ip6protosw.h> 127#include <netinet6/pim6.h> 128#include <netinet6/pim6_var.h> 129#include <netinet6/vinet6.h> 130 131static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 132 133/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 134#define M_HASCL(m) ((m)->m_flags & M_EXT) 135 136static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 137static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 138static void pim6_init(void); 139static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 140static int set_pim6(int *); 141static int socket_send(struct socket *, struct mbuf *, 142 struct sockaddr_in6 *); 143
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144extern int in6_mcast_loop; |
145extern struct domain inet6domain; 146 147static const struct encaptab *pim6_encap_cookie; 148static const struct ip6protosw in6_pim_protosw = { 149 .pr_type = SOCK_RAW, 150 .pr_domain = &inet6domain, 151 .pr_protocol = IPPROTO_PIM, 152 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 153 .pr_input = pim6_input, 154 .pr_output = rip6_output, 155 .pr_ctloutput = rip6_ctloutput, 156 .pr_init = pim6_init, 157 .pr_usrreqs = &rip6_usrreqs 158}; 159static int pim6_encapcheck(const struct mbuf *, int, int, void *); 160 161#ifdef VIMAGE_GLOBALS 162static int ip6_mrouter_ver; 163#endif 164 165SYSCTL_DECL(_net_inet6); 166SYSCTL_DECL(_net_inet6_ip6); 167SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 168 169static struct mrt6stat mrt6stat; 170SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 171 &mrt6stat, mrt6stat, 172 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 173 174#define NO_RTE_FOUND 0x1 175#define RTE_FOUND 0x2 176 177static struct mtx mrouter6_mtx; 178#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 179#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 180#define MROUTER6_LOCK_ASSERT() do { \ 181 mtx_assert(&mrouter6_mtx, MA_OWNED); \ 182 NET_ASSERT_GIANT(); \ 183} while (0) 184#define MROUTER6_LOCK_INIT() \ 185 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 186#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 187 188static struct mf6c *mf6ctable[MF6CTBLSIZ]; 189SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 190 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 191 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 192 "netinet6/ip6_mroute.h)"); 193 194static struct mtx mfc6_mtx; 195#define MFC6_LOCK() mtx_lock(&mfc6_mtx) 196#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 197#define MFC6_LOCK_ASSERT() do { \ 198 mtx_assert(&mfc6_mtx, MA_OWNED); \ 199 NET_ASSERT_GIANT(); \ 200} while (0) 201#define MFC6_LOCK_INIT() \ 202 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 203#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 204 205static u_char n6expire[MF6CTBLSIZ]; 206 207static struct mif6 mif6table[MAXMIFS]; 208SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 209 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]", 210 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)"); 211 212static struct mtx mif6_mtx; 213#define MIF6_LOCK() mtx_lock(&mif6_mtx) 214#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 215#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 216#define MIF6_LOCK_INIT() \ 217 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 218#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 219 220#ifdef MRT6DEBUG 221#ifdef VIMAGE_GLOBALS 222static u_int mrt6debug = 0; /* debug level */ 223#endif 224#define DEBUG_MFC 0x02 225#define DEBUG_FORWARD 0x04 226#define DEBUG_EXPIRE 0x08 227#define DEBUG_XMIT 0x10 228#define DEBUG_REG 0x20 229#define DEBUG_PIM 0x40 230#endif 231 232static void expire_upcalls(void *); 233#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 234#define UPCALL_EXPIRE 6 /* number of timeouts */ 235 236/* 237 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 238 */ 239 240/* 241 * 'Interfaces' associated with decapsulator (so we can tell 242 * packets that went through it from ones that get reflected 243 * by a broken gateway). Different from IPv4 register_if, 244 * these interfaces are linked into the system ifnet list, 245 * because per-interface IPv6 statistics are maintained in 246 * ifp->if_afdata. But it does not have any routes point 247 * to them. I.e., packets can't be sent this way. They 248 * only exist as a placeholder for multicast source 249 * verification. 250 */ 251static struct ifnet *multicast_register_if6; 252 253#define ENCAP_HOPS 64 254 255/* 256 * Private variables. 257 */ 258static mifi_t nummifs = 0; 259static mifi_t reg_mif_num = (mifi_t)-1; 260 261static struct pim6stat pim6stat; 262SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 263 &pim6stat, pim6stat, 264 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 265 266#ifdef VIMAGE_GLOBALS 267static int pim6; 268#endif 269 270/* 271 * Hash function for a source, group entry 272 */ 273#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 274 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 275 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 276 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 277 278/* 279 * Find a route for a given origin IPv6 address and Multicast group address. 280 */ 281#define MF6CFIND(o, g, rt) do { \ 282 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 283 rt = NULL; \ 284 mrt6stat.mrt6s_mfc_lookups++; \ 285 while (_rt) { \ 286 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 287 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 288 (_rt->mf6c_stall == NULL)) { \ 289 rt = _rt; \ 290 break; \ 291 } \ 292 _rt = _rt->mf6c_next; \ 293 } \ 294 if (rt == NULL) { \ 295 mrt6stat.mrt6s_mfc_misses++; \ 296 } \ 297} while (/*CONSTCOND*/ 0) 298 299/* 300 * Macros to compute elapsed time efficiently 301 * Borrowed from Van Jacobson's scheduling code 302 * XXX: replace with timersub() ? 303 */ 304#define TV_DELTA(a, b, delta) do { \ 305 int xxs; \ 306 \ 307 delta = (a).tv_usec - (b).tv_usec; \ 308 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 309 switch (xxs) { \ 310 case 2: \ 311 delta += 1000000; \ 312 /* FALLTHROUGH */ \ 313 case 1: \ 314 delta += 1000000; \ 315 break; \ 316 default: \ 317 delta += (1000000 * xxs); \ 318 } \ 319 } \ 320} while (/*CONSTCOND*/ 0) 321 322/* XXX: replace with timercmp(a, b, <) ? */ 323#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 324 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 325 326#ifdef UPCALL_TIMING 327#define UPCALL_MAX 50 328static u_long upcall_data[UPCALL_MAX + 1]; 329static void collate(); 330#endif /* UPCALL_TIMING */ 331 332static int ip6_mrouter_init(struct socket *, int, int); 333static int add_m6fc(struct mf6cctl *); 334static int add_m6if(struct mif6ctl *); 335static int del_m6fc(struct mf6cctl *); 336static int del_m6if(mifi_t *); 337static int del_m6if_locked(mifi_t *); 338static int get_mif6_cnt(struct sioc_mif_req6 *); 339static int get_sg_cnt(struct sioc_sg_req6 *); 340 341static struct callout expire_upcalls_ch; 342 343int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 344int X_ip6_mrouter_done(void); 345int X_ip6_mrouter_set(struct socket *, struct sockopt *); 346int X_ip6_mrouter_get(struct socket *, struct sockopt *); 347int X_mrt6_ioctl(int, caddr_t); 348 349static void 350pim6_init(void) 351{ 352 INIT_VNET_INET6(curvnet); 353 354 V_ip6_mrouter_ver = 0; 355#ifdef MRT6DEBUG 356 V_mrt6debug = 0; /* debug level */ 357#endif 358} 359 360/* 361 * Handle MRT setsockopt commands to modify the multicast routing tables. 362 */ 363int 364X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 365{ 366 int error = 0; 367 int optval; 368 struct mif6ctl mifc; 369 struct mf6cctl mfcc; 370 mifi_t mifi; 371
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370 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
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372 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) |
373 return (EACCES); 374 375 switch (sopt->sopt_name) { 376 case MRT6_INIT: 377#ifdef MRT6_OINIT 378 case MRT6_OINIT: 379#endif 380 error = sooptcopyin(sopt, &optval, sizeof(optval), 381 sizeof(optval)); 382 if (error) 383 break; 384 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 385 break; 386 case MRT6_DONE: 387 error = X_ip6_mrouter_done(); 388 break; 389 case MRT6_ADD_MIF: 390 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 391 if (error) 392 break; 393 error = add_m6if(&mifc); 394 break; 395 case MRT6_ADD_MFC: 396 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 397 if (error) 398 break; 399 error = add_m6fc(&mfcc); 400 break; 401 case MRT6_DEL_MFC: 402 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 403 if (error) 404 break; 405 error = del_m6fc(&mfcc); 406 break; 407 case MRT6_DEL_MIF: 408 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 409 if (error) 410 break; 411 error = del_m6if(&mifi); 412 break; 413 case MRT6_PIM: 414 error = sooptcopyin(sopt, &optval, sizeof(optval), 415 sizeof(optval)); 416 if (error) 417 break; 418 error = set_pim6(&optval); 419 break; 420 default: 421 error = EOPNOTSUPP; 422 break; 423 } 424 425 return (error); 426} 427 428/* 429 * Handle MRT getsockopt commands 430 */ 431int 432X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 433{ 434 INIT_VNET_INET6(curvnet); 435 int error = 0; 436
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435 if (so != ip6_mrouter)
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437 if (so != V_ip6_mrouter) |
438 return (EACCES); 439 440 switch (sopt->sopt_name) { 441 case MRT6_PIM: 442 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 443 break; 444 } 445 return (error); 446} 447 448/* 449 * Handle ioctl commands to obtain information from the cache 450 */ 451int 452X_mrt6_ioctl(int cmd, caddr_t data) 453{ 454 int ret; 455 456 ret = EINVAL; 457 458 switch (cmd) { 459 case SIOCGETSGCNT_IN6: 460 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 461 break; 462 463 case SIOCGETMIFCNT_IN6: 464 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 465 break; 466 467 default: 468 break; 469 } 470 471 return (ret); 472} 473 474/* 475 * returns the packet, byte, rpf-failure count for the source group provided 476 */ 477static int 478get_sg_cnt(struct sioc_sg_req6 *req) 479{ 480 struct mf6c *rt; 481 int ret; 482 483 ret = 0; 484 485 MFC6_LOCK(); 486 487 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 488 if (rt == NULL) { 489 ret = ESRCH; 490 } else { 491 req->pktcnt = rt->mf6c_pkt_cnt; 492 req->bytecnt = rt->mf6c_byte_cnt; 493 req->wrong_if = rt->mf6c_wrong_if; 494 } 495 496 MFC6_UNLOCK(); 497 498 return (ret); 499} 500 501/* 502 * returns the input and output packet and byte counts on the mif provided 503 */ 504static int 505get_mif6_cnt(struct sioc_mif_req6 *req) 506{ 507 mifi_t mifi; 508 int ret; 509 510 ret = 0; 511 mifi = req->mifi; 512 513 MIF6_LOCK(); 514 515 if (mifi >= nummifs) { 516 ret = EINVAL; 517 } else { 518 req->icount = mif6table[mifi].m6_pkt_in; 519 req->ocount = mif6table[mifi].m6_pkt_out; 520 req->ibytes = mif6table[mifi].m6_bytes_in; 521 req->obytes = mif6table[mifi].m6_bytes_out; 522 } 523 524 MIF6_UNLOCK(); 525 526 return (ret); 527} 528 529static int 530set_pim6(int *i) 531{ 532 INIT_VNET_INET6(curvnet); 533 if ((*i != 1) && (*i != 0)) 534 return (EINVAL); 535 536 V_pim6 = *i; 537 538 return (0); 539} 540 541/* 542 * Enable multicast routing 543 */ 544static int 545ip6_mrouter_init(struct socket *so, int v, int cmd) 546{ 547 INIT_VNET_INET6(curvnet); 548 549#ifdef MRT6DEBUG 550 if (V_mrt6debug) 551 log(LOG_DEBUG, 552 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 553 so->so_type, so->so_proto->pr_protocol); 554#endif 555 556 if (so->so_type != SOCK_RAW || 557 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 558 return (EOPNOTSUPP); 559 560 if (v != 1) 561 return (ENOPROTOOPT); 562 563 MROUTER6_LOCK(); 564
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563 if (ip6_mrouter != NULL) {
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565 if (V_ip6_mrouter != NULL) { |
566 MROUTER6_UNLOCK(); 567 return (EADDRINUSE); 568 } 569
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568 ip6_mrouter = so;
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570 V_ip6_mrouter = so; |
571 V_ip6_mrouter_ver = cmd; 572 573 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 574 bzero((caddr_t)n6expire, sizeof(n6expire)); 575 576 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 577 578 callout_init(&expire_upcalls_ch, 0); 579 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 580 expire_upcalls, NULL); 581 582 MROUTER6_UNLOCK(); 583 584#ifdef MRT6DEBUG 585 if (V_mrt6debug) 586 log(LOG_DEBUG, "ip6_mrouter_init\n"); 587#endif 588 589 return (0); 590} 591 592/* 593 * Disable IPv6 multicast forwarding. 594 */ 595int 596X_ip6_mrouter_done(void) 597{ 598 INIT_VNET_INET6(curvnet); 599 mifi_t mifi; 600 int i; 601 struct mf6c *rt; 602 struct rtdetq *rte; 603 604 MROUTER6_LOCK(); 605
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604 if (ip6_mrouter == NULL) {
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606 if (V_ip6_mrouter == NULL) { |
607 MROUTER6_UNLOCK(); 608 return (EINVAL); 609 } 610 611 /* 612 * For each phyint in use, disable promiscuous reception of all IPv6 613 * multicasts. 614 */ 615 for (mifi = 0; mifi < nummifs; mifi++) { 616 if (mif6table[mifi].m6_ifp && 617 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 618 if_allmulti(mif6table[mifi].m6_ifp, 0); 619 } 620 } 621 bzero((caddr_t)mif6table, sizeof(mif6table)); 622 nummifs = 0; 623 624 V_pim6 = 0; /* used to stub out/in pim specific code */ 625 626 callout_stop(&expire_upcalls_ch); 627 628 /* 629 * Free all multicast forwarding cache entries. 630 */ 631 MFC6_LOCK(); 632 for (i = 0; i < MF6CTBLSIZ; i++) { 633 rt = mf6ctable[i]; 634 while (rt) { 635 struct mf6c *frt; 636 637 for (rte = rt->mf6c_stall; rte != NULL; ) { 638 struct rtdetq *n = rte->next; 639 640 m_free(rte->m); 641 free(rte, M_MRTABLE6); 642 rte = n; 643 } 644 frt = rt; 645 rt = rt->mf6c_next; 646 free(frt, M_MRTABLE6); 647 } 648 } 649 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 650 MFC6_UNLOCK(); 651 652 /* 653 * Reset register interface 654 */ 655 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 656 if_detach(multicast_register_if6); 657 if_free(multicast_register_if6); 658 reg_mif_num = (mifi_t)-1; 659 multicast_register_if6 = NULL; 660 } 661
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660 ip6_mrouter = NULL;
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662 V_ip6_mrouter = NULL; |
663 V_ip6_mrouter_ver = 0; 664 665 MROUTER6_UNLOCK(); 666 667#ifdef MRT6DEBUG 668 if (V_mrt6debug) 669 log(LOG_DEBUG, "ip6_mrouter_done\n"); 670#endif 671 672 return (0); 673} 674 675static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 676 677/* 678 * Add a mif to the mif table 679 */ 680static int 681add_m6if(struct mif6ctl *mifcp) 682{ 683 INIT_VNET_NET(curvnet); 684 struct mif6 *mifp; 685 struct ifnet *ifp; 686 int error; 687 688 MIF6_LOCK(); 689 690 if (mifcp->mif6c_mifi >= MAXMIFS) { 691 MIF6_UNLOCK(); 692 return (EINVAL); 693 } 694 mifp = mif6table + mifcp->mif6c_mifi; 695 if (mifp->m6_ifp != NULL) { 696 MIF6_UNLOCK(); 697 return (EADDRINUSE); /* XXX: is it appropriate? */ 698 } 699 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 700 MIF6_UNLOCK(); 701 return (ENXIO); 702 } 703 704 ifp = ifnet_byindex(mifcp->mif6c_pifi); 705 706 if (mifcp->mif6c_flags & MIFF_REGISTER) { 707 if (reg_mif_num == (mifi_t)-1) { 708 ifp = if_alloc(IFT_OTHER); 709 710 if_initname(ifp, "register_mif", 0); 711 ifp->if_flags |= IFF_LOOPBACK; 712 if_attach(ifp); 713 multicast_register_if6 = ifp; 714 reg_mif_num = mifcp->mif6c_mifi; 715 /* 716 * it is impossible to guess the ifindex of the 717 * register interface. So mif6c_pifi is automatically 718 * calculated. 719 */ 720 mifcp->mif6c_pifi = ifp->if_index; 721 } else { 722 ifp = multicast_register_if6; 723 } 724 } else { 725 /* Make sure the interface supports multicast */ 726 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 727 MIF6_UNLOCK(); 728 return (EOPNOTSUPP); 729 } 730 731 error = if_allmulti(ifp, 1); 732 if (error) { 733 MIF6_UNLOCK(); 734 return (error); 735 } 736 } 737 738 mifp->m6_flags = mifcp->mif6c_flags; 739 mifp->m6_ifp = ifp; 740 741 /* initialize per mif pkt counters */ 742 mifp->m6_pkt_in = 0; 743 mifp->m6_pkt_out = 0; 744 mifp->m6_bytes_in = 0; 745 mifp->m6_bytes_out = 0; 746 bzero(&mifp->m6_route, sizeof(mifp->m6_route)); 747 748 /* Adjust nummifs up if the mifi is higher than nummifs */ 749 if (nummifs <= mifcp->mif6c_mifi) 750 nummifs = mifcp->mif6c_mifi + 1; 751 752 MIF6_UNLOCK(); 753 754#ifdef MRT6DEBUG 755 if (V_mrt6debug) 756 log(LOG_DEBUG, 757 "add_mif #%d, phyint %s\n", 758 mifcp->mif6c_mifi, 759 ifp->if_xname); 760#endif 761 762 return (0); 763} 764 765/* 766 * Delete a mif from the mif table 767 */ 768static int 769del_m6if_locked(mifi_t *mifip) 770{ 771 struct mif6 *mifp = mif6table + *mifip; 772 mifi_t mifi; 773 struct ifnet *ifp; 774 775 MIF6_LOCK_ASSERT(); 776 777 if (*mifip >= nummifs) 778 return (EINVAL); 779 if (mifp->m6_ifp == NULL) 780 return (EINVAL); 781 782 if (!(mifp->m6_flags & MIFF_REGISTER)) { 783 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 784 ifp = mifp->m6_ifp; 785 if_allmulti(ifp, 0); 786 } else { 787 if (reg_mif_num != (mifi_t)-1 && 788 multicast_register_if6 != NULL) { 789 if_detach(multicast_register_if6); 790 if_free(multicast_register_if6); 791 reg_mif_num = (mifi_t)-1; 792 multicast_register_if6 = NULL; 793 } 794 } 795 796 bzero((caddr_t)mifp, sizeof(*mifp)); 797 798 /* Adjust nummifs down */ 799 for (mifi = nummifs; mifi > 0; mifi--) 800 if (mif6table[mifi - 1].m6_ifp) 801 break; 802 nummifs = mifi; 803 804#ifdef MRT6DEBUG 805 if (V_mrt6debug) 806 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 807#endif 808 809 return (0); 810} 811 812static int 813del_m6if(mifi_t *mifip) 814{ 815 int cc; 816 817 MIF6_LOCK(); 818 cc = del_m6if_locked(mifip); 819 MIF6_UNLOCK(); 820 821 return (cc); 822} 823 824/* 825 * Add an mfc entry 826 */ 827static int 828add_m6fc(struct mf6cctl *mfccp) 829{ 830 struct mf6c *rt; 831 u_long hash; 832 struct rtdetq *rte; 833 u_short nstl; 834 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 835 836 MFC6_LOCK(); 837 838 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 839 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 840 841 /* If an entry already exists, just update the fields */ 842 if (rt) { 843#ifdef MRT6DEBUG 844 if (V_mrt6debug & DEBUG_MFC) { 845 log(LOG_DEBUG, 846 "add_m6fc no upcall h %d o %s g %s p %x\n", 847 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 848 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 849 mfccp->mf6cc_parent); 850 } 851#endif 852 853 rt->mf6c_parent = mfccp->mf6cc_parent; 854 rt->mf6c_ifset = mfccp->mf6cc_ifset; 855 856 MFC6_UNLOCK(); 857 return (0); 858 } 859 860 /* 861 * Find the entry for which the upcall was made and update 862 */ 863 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 864 mfccp->mf6cc_mcastgrp.sin6_addr); 865 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 866 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 867 &mfccp->mf6cc_origin.sin6_addr) && 868 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 869 &mfccp->mf6cc_mcastgrp.sin6_addr) && 870 (rt->mf6c_stall != NULL)) { 871 872 if (nstl++) 873 log(LOG_ERR, 874 "add_m6fc: %s o %s g %s p %x dbx %p\n", 875 "multiple kernel entries", 876 ip6_sprintf(ip6bufo, 877 &mfccp->mf6cc_origin.sin6_addr), 878 ip6_sprintf(ip6bufg, 879 &mfccp->mf6cc_mcastgrp.sin6_addr), 880 mfccp->mf6cc_parent, rt->mf6c_stall); 881 882#ifdef MRT6DEBUG 883 if (V_mrt6debug & DEBUG_MFC) 884 log(LOG_DEBUG, 885 "add_m6fc o %s g %s p %x dbg %x\n", 886 ip6_sprintf(ip6bufo, 887 &mfccp->mf6cc_origin.sin6_addr), 888 ip6_sprintf(ip6bufg, 889 &mfccp->mf6cc_mcastgrp.sin6_addr), 890 mfccp->mf6cc_parent, rt->mf6c_stall); 891#endif 892 893 rt->mf6c_origin = mfccp->mf6cc_origin; 894 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 895 rt->mf6c_parent = mfccp->mf6cc_parent; 896 rt->mf6c_ifset = mfccp->mf6cc_ifset; 897 /* initialize pkt counters per src-grp */ 898 rt->mf6c_pkt_cnt = 0; 899 rt->mf6c_byte_cnt = 0; 900 rt->mf6c_wrong_if = 0; 901 902 rt->mf6c_expire = 0; /* Don't clean this guy up */ 903 n6expire[hash]--; 904 905 /* free packets Qed at the end of this entry */ 906 for (rte = rt->mf6c_stall; rte != NULL; ) { 907 struct rtdetq *n = rte->next; 908 ip6_mdq(rte->m, rte->ifp, rt); 909 m_freem(rte->m); 910#ifdef UPCALL_TIMING 911 collate(&(rte->t)); 912#endif /* UPCALL_TIMING */ 913 free(rte, M_MRTABLE6); 914 rte = n; 915 } 916 rt->mf6c_stall = NULL; 917 } 918 } 919 920 /* 921 * It is possible that an entry is being inserted without an upcall 922 */ 923 if (nstl == 0) { 924#ifdef MRT6DEBUG 925 if (V_mrt6debug & DEBUG_MFC) 926 log(LOG_DEBUG, 927 "add_mfc no upcall h %d o %s g %s p %x\n", 928 hash, 929 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 930 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 931 mfccp->mf6cc_parent); 932#endif 933 934 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 935 936 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 937 &mfccp->mf6cc_origin.sin6_addr)&& 938 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 939 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 940 941 rt->mf6c_origin = mfccp->mf6cc_origin; 942 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 943 rt->mf6c_parent = mfccp->mf6cc_parent; 944 rt->mf6c_ifset = mfccp->mf6cc_ifset; 945 /* initialize pkt counters per src-grp */ 946 rt->mf6c_pkt_cnt = 0; 947 rt->mf6c_byte_cnt = 0; 948 rt->mf6c_wrong_if = 0; 949 950 if (rt->mf6c_expire) 951 n6expire[hash]--; 952 rt->mf6c_expire = 0; 953 } 954 } 955 if (rt == NULL) { 956 /* no upcall, so make a new entry */ 957 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 958 M_NOWAIT); 959 if (rt == NULL) { 960 MFC6_UNLOCK(); 961 return (ENOBUFS); 962 } 963 964 /* insert new entry at head of hash chain */ 965 rt->mf6c_origin = mfccp->mf6cc_origin; 966 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 967 rt->mf6c_parent = mfccp->mf6cc_parent; 968 rt->mf6c_ifset = mfccp->mf6cc_ifset; 969 /* initialize pkt counters per src-grp */ 970 rt->mf6c_pkt_cnt = 0; 971 rt->mf6c_byte_cnt = 0; 972 rt->mf6c_wrong_if = 0; 973 rt->mf6c_expire = 0; 974 rt->mf6c_stall = NULL; 975 976 /* link into table */ 977 rt->mf6c_next = mf6ctable[hash]; 978 mf6ctable[hash] = rt; 979 } 980 } 981 982 MFC6_UNLOCK(); 983 return (0); 984} 985 986#ifdef UPCALL_TIMING 987/* 988 * collect delay statistics on the upcalls 989 */ 990static void 991collate(struct timeval *t) 992{ 993 u_long d; 994 struct timeval tp; 995 u_long delta; 996 997 GET_TIME(tp); 998 999 if (TV_LT(*t, tp)) 1000 { 1001 TV_DELTA(tp, *t, delta); 1002 1003 d = delta >> 10; 1004 if (d > UPCALL_MAX) 1005 d = UPCALL_MAX; 1006 1007 ++upcall_data[d]; 1008 } 1009} 1010#endif /* UPCALL_TIMING */ 1011 1012/* 1013 * Delete an mfc entry 1014 */ 1015static int 1016del_m6fc(struct mf6cctl *mfccp) 1017{ 1018 struct sockaddr_in6 origin; 1019 struct sockaddr_in6 mcastgrp; 1020 struct mf6c *rt; 1021 struct mf6c **nptr; 1022 u_long hash; 1023 1024 origin = mfccp->mf6cc_origin; 1025 mcastgrp = mfccp->mf6cc_mcastgrp; 1026 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1027 1028#ifdef MRT6DEBUG 1029 if (V_mrt6debug & DEBUG_MFC) { 1030 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1031 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 1032 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1033 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1034 } 1035#endif 1036 1037 MFC6_LOCK(); 1038 1039 nptr = &mf6ctable[hash]; 1040 while ((rt = *nptr) != NULL) { 1041 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1042 &rt->mf6c_origin.sin6_addr) && 1043 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1044 &rt->mf6c_mcastgrp.sin6_addr) && 1045 rt->mf6c_stall == NULL) 1046 break; 1047 1048 nptr = &rt->mf6c_next; 1049 } 1050 if (rt == NULL) { 1051 MFC6_UNLOCK(); 1052 return (EADDRNOTAVAIL); 1053 } 1054 1055 *nptr = rt->mf6c_next; 1056 free(rt, M_MRTABLE6); 1057 1058 MFC6_UNLOCK(); 1059 1060 return (0); 1061} 1062 1063static int 1064socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1065{ 1066 1067 if (s) { 1068 if (sbappendaddr(&s->so_rcv, 1069 (struct sockaddr *)src, 1070 mm, (struct mbuf *)0) != 0) { 1071 sorwakeup(s); 1072 return (0); 1073 } 1074 } 1075 m_freem(mm); 1076 return (-1); 1077} 1078 1079/* 1080 * IPv6 multicast forwarding function. This function assumes that the packet 1081 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1082 * pointed to by "ifp", and the packet is to be relayed to other networks 1083 * that have members of the packet's destination IPv6 multicast group. 1084 * 1085 * The packet is returned unscathed to the caller, unless it is 1086 * erroneous, in which case a non-zero return value tells the caller to 1087 * discard it. 1088 * 1089 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1090 * this function is called in the originating context (i.e., not when 1091 * forwarding a packet from other node). ip6_output(), which is currently the 1092 * only function that calls this function is called in the originating context, 1093 * explicitly ensures this condition. It is caller's responsibility to ensure 1094 * that if this function is called from somewhere else in the originating 1095 * context in the future. 1096 */ 1097int 1098X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1099{ 1100 INIT_VNET_INET6(curvnet); 1101 struct mf6c *rt; 1102 struct mif6 *mifp; 1103 struct mbuf *mm; 1104 mifi_t mifi; 1105 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1106 1107#ifdef MRT6DEBUG 1108 if (V_mrt6debug & DEBUG_FORWARD) 1109 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1110 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1111 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1112 ifp->if_index); 1113#endif 1114 1115 /* 1116 * Don't forward a packet with Hop limit of zero or one, 1117 * or a packet destined to a local-only group. 1118 */ 1119 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1120 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1121 return (0); 1122 ip6->ip6_hlim--; 1123 1124 /* 1125 * Source address check: do not forward packets with unspecified 1126 * source. It was discussed in July 2000, on ipngwg mailing list. 1127 * This is rather more serious than unicast cases, because some 1128 * MLD packets can be sent with the unspecified source address 1129 * (although such packets must normally set 1 to the hop limit field). 1130 */ 1131 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1132 V_ip6stat.ip6s_cantforward++; 1133 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1134 V_ip6_log_time = time_second; 1135 log(LOG_DEBUG, 1136 "cannot forward " 1137 "from %s to %s nxt %d received on %s\n", 1138 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1139 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1140 ip6->ip6_nxt, 1141 if_name(m->m_pkthdr.rcvif)); 1142 } 1143 return (0); 1144 } 1145 1146 MFC6_LOCK(); 1147 1148 /* 1149 * Determine forwarding mifs from the forwarding cache table 1150 */ 1151 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1152 1153 /* Entry exists, so forward if necessary */ 1154 if (rt) { 1155 MFC6_UNLOCK(); 1156 return (ip6_mdq(m, ifp, rt)); 1157 } else { 1158 /* 1159 * If we don't have a route for packet's origin, 1160 * Make a copy of the packet & 1161 * send message to routing daemon 1162 */ 1163 1164 struct mbuf *mb0; 1165 struct rtdetq *rte; 1166 u_long hash; 1167/* int i, npkts;*/ 1168#ifdef UPCALL_TIMING 1169 struct timeval tp; 1170 1171 GET_TIME(tp); 1172#endif /* UPCALL_TIMING */ 1173 1174 mrt6stat.mrt6s_no_route++; 1175#ifdef MRT6DEBUG 1176 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1177 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1178 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1179 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1180#endif 1181 1182 /* 1183 * Allocate mbufs early so that we don't do extra work if we 1184 * are just going to fail anyway. 1185 */ 1186 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1187 M_NOWAIT); 1188 if (rte == NULL) { 1189 MFC6_UNLOCK(); 1190 return (ENOBUFS); 1191 } 1192 mb0 = m_copy(m, 0, M_COPYALL); 1193 /* 1194 * Pullup packet header if needed before storing it, 1195 * as other references may modify it in the meantime. 1196 */ 1197 if (mb0 && 1198 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1199 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1200 if (mb0 == NULL) { 1201 free(rte, M_MRTABLE6); 1202 MFC6_UNLOCK(); 1203 return (ENOBUFS); 1204 } 1205 1206 /* is there an upcall waiting for this packet? */ 1207 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1208 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1209 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1210 &rt->mf6c_origin.sin6_addr) && 1211 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1212 &rt->mf6c_mcastgrp.sin6_addr) && 1213 (rt->mf6c_stall != NULL)) 1214 break; 1215 } 1216 1217 if (rt == NULL) { 1218 struct mrt6msg *im; 1219#ifdef MRT6_OINIT 1220 struct omrt6msg *oim; 1221#endif 1222 1223 /* no upcall, so make a new entry */ 1224 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1225 M_NOWAIT); 1226 if (rt == NULL) { 1227 free(rte, M_MRTABLE6); 1228 m_freem(mb0); 1229 MFC6_UNLOCK(); 1230 return (ENOBUFS); 1231 } 1232 /* 1233 * Make a copy of the header to send to the user 1234 * level process 1235 */ 1236 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1237 1238 if (mm == NULL) { 1239 free(rte, M_MRTABLE6); 1240 m_freem(mb0); 1241 free(rt, M_MRTABLE6); 1242 MFC6_UNLOCK(); 1243 return (ENOBUFS); 1244 } 1245 1246 /* 1247 * Send message to routing daemon 1248 */ 1249 sin6.sin6_addr = ip6->ip6_src; 1250 1251 im = NULL; 1252#ifdef MRT6_OINIT 1253 oim = NULL; 1254#endif 1255 switch (V_ip6_mrouter_ver) { 1256#ifdef MRT6_OINIT 1257 case MRT6_OINIT: 1258 oim = mtod(mm, struct omrt6msg *); 1259 oim->im6_msgtype = MRT6MSG_NOCACHE; 1260 oim->im6_mbz = 0; 1261 break; 1262#endif 1263 case MRT6_INIT: 1264 im = mtod(mm, struct mrt6msg *); 1265 im->im6_msgtype = MRT6MSG_NOCACHE; 1266 im->im6_mbz = 0; 1267 break; 1268 default: 1269 free(rte, M_MRTABLE6); 1270 m_freem(mb0); 1271 free(rt, M_MRTABLE6); 1272 MFC6_UNLOCK(); 1273 return (EINVAL); 1274 } 1275 1276#ifdef MRT6DEBUG 1277 if (V_mrt6debug & DEBUG_FORWARD) 1278 log(LOG_DEBUG, 1279 "getting the iif info in the kernel\n"); 1280#endif 1281 1282 for (mifp = mif6table, mifi = 0; 1283 mifi < nummifs && mifp->m6_ifp != ifp; 1284 mifp++, mifi++) 1285 ; 1286 1287 switch (V_ip6_mrouter_ver) { 1288#ifdef MRT6_OINIT 1289 case MRT6_OINIT: 1290 oim->im6_mif = mifi; 1291 break; 1292#endif 1293 case MRT6_INIT: 1294 im->im6_mif = mifi; 1295 break; 1296 } 1297
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1296 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
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1298 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { |
1299 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1300 "socket queue full\n"); 1301 mrt6stat.mrt6s_upq_sockfull++; 1302 free(rte, M_MRTABLE6); 1303 m_freem(mb0); 1304 free(rt, M_MRTABLE6); 1305 MFC6_UNLOCK(); 1306 return (ENOBUFS); 1307 } 1308 1309 mrt6stat.mrt6s_upcalls++; 1310 1311 /* insert new entry at head of hash chain */ 1312 bzero(rt, sizeof(*rt)); 1313 rt->mf6c_origin.sin6_family = AF_INET6; 1314 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1315 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1316 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1317 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1318 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1319 rt->mf6c_expire = UPCALL_EXPIRE; 1320 n6expire[hash]++; 1321 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1322 1323 /* link into table */ 1324 rt->mf6c_next = mf6ctable[hash]; 1325 mf6ctable[hash] = rt; 1326 /* Add this entry to the end of the queue */ 1327 rt->mf6c_stall = rte; 1328 } else { 1329 /* determine if q has overflowed */ 1330 struct rtdetq **p; 1331 int npkts = 0; 1332 1333 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1334 if (++npkts > MAX_UPQ6) { 1335 mrt6stat.mrt6s_upq_ovflw++; 1336 free(rte, M_MRTABLE6); 1337 m_freem(mb0); 1338 MFC6_UNLOCK(); 1339 return (0); 1340 } 1341 1342 /* Add this entry to the end of the queue */ 1343 *p = rte; 1344 } 1345 1346 rte->next = NULL; 1347 rte->m = mb0; 1348 rte->ifp = ifp; 1349#ifdef UPCALL_TIMING 1350 rte->t = tp; 1351#endif /* UPCALL_TIMING */ 1352 1353 MFC6_UNLOCK(); 1354 1355 return (0); 1356 } 1357} 1358 1359/* 1360 * Clean up cache entries if upcalls are not serviced 1361 * Call from the Slow Timeout mechanism, every half second. 1362 */ 1363static void 1364expire_upcalls(void *unused) 1365{ 1366 struct rtdetq *rte; 1367 struct mf6c *mfc, **nptr; 1368 int i; 1369 1370 MFC6_LOCK(); 1371 for (i = 0; i < MF6CTBLSIZ; i++) { 1372 if (n6expire[i] == 0) 1373 continue; 1374 nptr = &mf6ctable[i]; 1375 while ((mfc = *nptr) != NULL) { 1376 rte = mfc->mf6c_stall; 1377 /* 1378 * Skip real cache entries 1379 * Make sure it wasn't marked to not expire (shouldn't happen) 1380 * If it expires now 1381 */ 1382 if (rte != NULL && 1383 mfc->mf6c_expire != 0 && 1384 --mfc->mf6c_expire == 0) { 1385#ifdef MRT6DEBUG 1386 if (V_mrt6debug & DEBUG_EXPIRE) { 1387 char ip6bufo[INET6_ADDRSTRLEN]; 1388 char ip6bufg[INET6_ADDRSTRLEN]; 1389 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1390 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1391 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1392 } 1393#endif 1394 /* 1395 * drop all the packets 1396 * free the mbuf with the pkt, if, timing info 1397 */ 1398 do { 1399 struct rtdetq *n = rte->next; 1400 m_freem(rte->m); 1401 free(rte, M_MRTABLE6); 1402 rte = n; 1403 } while (rte != NULL); 1404 mrt6stat.mrt6s_cache_cleanups++; 1405 n6expire[i]--; 1406 1407 *nptr = mfc->mf6c_next; 1408 free(mfc, M_MRTABLE6); 1409 } else { 1410 nptr = &mfc->mf6c_next; 1411 } 1412 } 1413 } 1414 MFC6_UNLOCK(); 1415 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1416 expire_upcalls, NULL); 1417} 1418 1419/* 1420 * Packet forwarding routine once entry in the cache is made 1421 */ 1422static int 1423ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1424{ 1425 INIT_VNET_INET6(curvnet); 1426 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1427 mifi_t mifi, iif; 1428 struct mif6 *mifp; 1429 int plen = m->m_pkthdr.len; 1430 struct in6_addr src0, dst0; /* copies for local work */ 1431 u_int32_t iszone, idzone, oszone, odzone; 1432 int error = 0; 1433 1434/* 1435 * Macro to send packet on mif. Since RSVP packets don't get counted on 1436 * input, they shouldn't get counted on output, so statistics keeping is 1437 * separate. 1438 */ 1439 1440#define MC6_SEND(ip6, mifp, m) do { \ 1441 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1442 register_send((ip6), (mifp), (m)); \ 1443 else \ 1444 phyint_send((ip6), (mifp), (m)); \ 1445} while (/*CONSTCOND*/ 0) 1446 1447 /* 1448 * Don't forward if it didn't arrive from the parent mif 1449 * for its origin. 1450 */ 1451 mifi = rt->mf6c_parent; 1452 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1453 /* came in the wrong interface */ 1454#ifdef MRT6DEBUG 1455 if (V_mrt6debug & DEBUG_FORWARD) 1456 log(LOG_DEBUG, 1457 "wrong if: ifid %d mifi %d mififid %x\n", 1458 ifp->if_index, mifi, 1459 mif6table[mifi].m6_ifp->if_index); 1460#endif 1461 mrt6stat.mrt6s_wrong_if++; 1462 rt->mf6c_wrong_if++; 1463 /* 1464 * If we are doing PIM processing, and we are forwarding 1465 * packets on this interface, send a message to the 1466 * routing daemon. 1467 */ 1468 /* have to make sure this is a valid mif */ 1469 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1470 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1471 /* 1472 * Check the M_LOOP flag to avoid an 1473 * unnecessary PIM assert. 1474 * XXX: M_LOOP is an ad-hoc hack... 1475 */ 1476 static struct sockaddr_in6 sin6 = 1477 { sizeof(sin6), AF_INET6 }; 1478 1479 struct mbuf *mm; 1480 struct mrt6msg *im; 1481#ifdef MRT6_OINIT 1482 struct omrt6msg *oim; 1483#endif 1484 1485 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1486 if (mm && 1487 (M_HASCL(mm) || 1488 mm->m_len < sizeof(struct ip6_hdr))) 1489 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1490 if (mm == NULL) 1491 return (ENOBUFS); 1492 1493#ifdef MRT6_OINIT 1494 oim = NULL; 1495#endif 1496 im = NULL; 1497 switch (V_ip6_mrouter_ver) { 1498#ifdef MRT6_OINIT 1499 case MRT6_OINIT: 1500 oim = mtod(mm, struct omrt6msg *); 1501 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1502 oim->im6_mbz = 0; 1503 break; 1504#endif 1505 case MRT6_INIT: 1506 im = mtod(mm, struct mrt6msg *); 1507 im->im6_msgtype = MRT6MSG_WRONGMIF; 1508 im->im6_mbz = 0; 1509 break; 1510 default: 1511 m_freem(mm); 1512 return (EINVAL); 1513 } 1514 1515 for (mifp = mif6table, iif = 0; 1516 iif < nummifs && mifp && 1517 mifp->m6_ifp != ifp; 1518 mifp++, iif++) 1519 ; 1520 1521 switch (V_ip6_mrouter_ver) { 1522#ifdef MRT6_OINIT 1523 case MRT6_OINIT: 1524 oim->im6_mif = iif; 1525 sin6.sin6_addr = oim->im6_src; 1526 break; 1527#endif 1528 case MRT6_INIT: 1529 im->im6_mif = iif; 1530 sin6.sin6_addr = im->im6_src; 1531 break; 1532 } 1533 1534 mrt6stat.mrt6s_upcalls++; 1535
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1534 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
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1536 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { |
1537#ifdef MRT6DEBUG 1538 if (V_mrt6debug) 1539 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1540#endif 1541 ++mrt6stat.mrt6s_upq_sockfull; 1542 return (ENOBUFS); 1543 } /* if socket Q full */ 1544 } /* if PIM */ 1545 return (0); 1546 } /* if wrong iif */ 1547 1548 /* If I sourced this packet, it counts as output, else it was input. */ 1549 if (m->m_pkthdr.rcvif == NULL) { 1550 /* XXX: is rcvif really NULL when output?? */ 1551 mif6table[mifi].m6_pkt_out++; 1552 mif6table[mifi].m6_bytes_out += plen; 1553 } else { 1554 mif6table[mifi].m6_pkt_in++; 1555 mif6table[mifi].m6_bytes_in += plen; 1556 } 1557 rt->mf6c_pkt_cnt++; 1558 rt->mf6c_byte_cnt += plen; 1559 1560 /* 1561 * For each mif, forward a copy of the packet if there are group 1562 * members downstream on the interface. 1563 */ 1564 src0 = ip6->ip6_src; 1565 dst0 = ip6->ip6_dst; 1566 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1567 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1568 V_ip6stat.ip6s_badscope++; 1569 return (error); 1570 } 1571 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1572 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1573 /* 1574 * check if the outgoing packet is going to break 1575 * a scope boundary. 1576 * XXX For packets through PIM register tunnel 1577 * interface, we believe a routing daemon. 1578 */ 1579 if (!(mif6table[rt->mf6c_parent].m6_flags & 1580 MIFF_REGISTER) && 1581 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1582 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1583 &oszone) || 1584 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1585 &odzone) || 1586 iszone != oszone || 1587 idzone != odzone) { 1588 V_ip6stat.ip6s_badscope++; 1589 continue; 1590 } 1591 } 1592 1593 mifp->m6_pkt_out++; 1594 mifp->m6_bytes_out += plen; 1595 MC6_SEND(ip6, mifp, m); 1596 } 1597 } 1598 return (0); 1599} 1600 1601static void 1602phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1603{ 1604 INIT_VNET_INET6(curvnet); 1605 struct mbuf *mb_copy; 1606 struct ifnet *ifp = mifp->m6_ifp; 1607 int error = 0;
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1606 struct in6_multi *in6m;
|
1608 struct sockaddr_in6 *dst6; 1609 u_long linkmtu; 1610
|
1611 dst6 = &mifp->m6_route.ro_dst; 1612 |
1613 /* 1614 * Make a new reference to the packet; make sure that 1615 * the IPv6 header is actually copied, not just referenced, 1616 * so that ip6_output() only scribbles on the copy. 1617 */ 1618 mb_copy = m_copy(m, 0, M_COPYALL); 1619 if (mb_copy && 1620 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1621 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1622 if (mb_copy == NULL) { 1623 return; 1624 } 1625 /* set MCAST flag to the outgoing packet */ 1626 mb_copy->m_flags |= M_MCAST; 1627 1628 /* 1629 * If we sourced the packet, call ip6_output since we may devide 1630 * the packet into fragments when the packet is too big for the 1631 * outgoing interface. 1632 * Otherwise, we can simply send the packet to the interface 1633 * sending queue. 1634 */ 1635 if (m->m_pkthdr.rcvif == NULL) { 1636 struct ip6_moptions im6o; 1637 1638 im6o.im6o_multicast_ifp = ifp; 1639 /* XXX: ip6_output will override ip6->ip6_hlim */ 1640 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1641 im6o.im6o_multicast_loop = 1; 1642 error = ip6_output(mb_copy, NULL, &mifp->m6_route, 1643 IPV6_FORWARDING, &im6o, NULL, NULL); 1644 1645#ifdef MRT6DEBUG 1646 if (V_mrt6debug & DEBUG_XMIT) 1647 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1648 mifp - mif6table, error); 1649#endif 1650 return; 1651 } 1652 1653 /*
|
1651 * If we belong to the destination multicast group
1652 * on the outgoing interface, loop back a copy.
|
1654 * If configured to loop back multicasts by default, 1655 * loop back a copy now. |
1656 */
|
1654 dst6 = &mifp->m6_route.ro_dst;
1655 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
1656 if (in6m != NULL) {
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1657 if (in6_mcast_loop) { |
1658 dst6->sin6_len = sizeof(struct sockaddr_in6); 1659 dst6->sin6_family = AF_INET6; 1660 dst6->sin6_addr = ip6->ip6_dst; 1661 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst); 1662 }
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1663 |
1664 /* 1665 * Put the packet into the sending queue of the outgoing interface 1666 * if it would fit in the MTU of the interface. 1667 */ 1668 linkmtu = IN6_LINKMTU(ifp); 1669 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1670 dst6->sin6_len = sizeof(struct sockaddr_in6); 1671 dst6->sin6_family = AF_INET6; 1672 dst6->sin6_addr = ip6->ip6_dst; 1673 /* 1674 * We just call if_output instead of nd6_output here, since 1675 * we need no ND for a multicast forwarded packet...right? 1676 */ 1677 error = (*ifp->if_output)(ifp, mb_copy, 1678 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL); 1679#ifdef MRT6DEBUG 1680 if (V_mrt6debug & DEBUG_XMIT) 1681 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1682 mifp - mif6table, error); 1683#endif 1684 } else { 1685 /* 1686 * pMTU discovery is intentionally disabled by default, since 1687 * various router may notify pMTU in multicast, which can be 1688 * a DDoS to a router 1689 */ 1690 if (V_ip6_mcast_pmtu) 1691 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1692 else { 1693#ifdef MRT6DEBUG 1694 if (V_mrt6debug & DEBUG_XMIT) { 1695 char ip6bufs[INET6_ADDRSTRLEN]; 1696 char ip6bufd[INET6_ADDRSTRLEN]; 1697 log(LOG_DEBUG, 1698 "phyint_send: packet too big on %s o %s " 1699 "g %s size %d(discarded)\n", 1700 if_name(ifp), 1701 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1702 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1703 mb_copy->m_pkthdr.len); 1704 } 1705#endif /* MRT6DEBUG */ 1706 m_freem(mb_copy); /* simply discard the packet */ 1707 } 1708 } 1709} 1710 1711static int 1712register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1713{ 1714 struct mbuf *mm; 1715 int i, len = m->m_pkthdr.len; 1716 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1717 struct mrt6msg *im6; 1718 1719#ifdef MRT6DEBUG 1720 if (V_mrt6debug) { 1721 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1722 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1723 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1724 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1725 } 1726#endif 1727 ++pim6stat.pim6s_snd_registers; 1728 1729 /* Make a copy of the packet to send to the user level process */ 1730 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1731 if (mm == NULL) 1732 return (ENOBUFS); 1733 mm->m_pkthdr.rcvif = NULL; 1734 mm->m_data += max_linkhdr; 1735 mm->m_len = sizeof(struct ip6_hdr); 1736 1737 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1738 m_freem(mm); 1739 return (ENOBUFS); 1740 } 1741 i = MHLEN - M_LEADINGSPACE(mm); 1742 if (i > len) 1743 i = len; 1744 mm = m_pullup(mm, i); 1745 if (mm == NULL) 1746 return (ENOBUFS); 1747/* TODO: check it! */ 1748 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1749 1750 /* 1751 * Send message to routing daemon 1752 */ 1753 sin6.sin6_addr = ip6->ip6_src; 1754 1755 im6 = mtod(mm, struct mrt6msg *); 1756 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1757 im6->im6_mbz = 0; 1758 1759 im6->im6_mif = mif - mif6table; 1760 1761 /* iif info is not given for reg. encap.n */ 1762 mrt6stat.mrt6s_upcalls++; 1763
|
1762 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
|
1764 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { |
1765#ifdef MRT6DEBUG 1766 if (V_mrt6debug) 1767 log(LOG_WARNING, 1768 "register_send: ip6_mrouter socket queue full\n"); 1769#endif 1770 ++mrt6stat.mrt6s_upq_sockfull; 1771 return (ENOBUFS); 1772 } 1773 return (0); 1774} 1775 1776/* 1777 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1778 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1779 * into the kernel. 1780 */ 1781static int 1782pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1783{ 1784 1785#ifdef DIAGNOSTIC 1786 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1787#endif 1788 if (proto != IPPROTO_PIM) 1789 return 0; /* not for us; reject the datagram. */ 1790 1791 return 64; /* claim the datagram. */ 1792} 1793 1794/* 1795 * PIM sparse mode hook 1796 * Receives the pim control messages, and passes them up to the listening 1797 * socket, using rip6_input. 1798 * The only message processed is the REGISTER pim message; the pim header 1799 * is stripped off, and the inner packet is passed to register_mforward. 1800 */ 1801int 1802pim6_input(struct mbuf **mp, int *offp, int proto) 1803{ 1804 INIT_VNET_INET6(curvnet); 1805 struct pim *pim; /* pointer to a pim struct */ 1806 struct ip6_hdr *ip6; 1807 int pimlen; 1808 struct mbuf *m = *mp; 1809 int minlen; 1810 int off = *offp; 1811 1812 ++pim6stat.pim6s_rcv_total; 1813 1814 ip6 = mtod(m, struct ip6_hdr *); 1815 pimlen = m->m_pkthdr.len - *offp; 1816 1817 /* 1818 * Validate lengths 1819 */ 1820 if (pimlen < PIM_MINLEN) { 1821 ++pim6stat.pim6s_rcv_tooshort; 1822#ifdef MRT6DEBUG 1823 if (V_mrt6debug & DEBUG_PIM) 1824 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1825#endif 1826 m_freem(m); 1827 return (IPPROTO_DONE); 1828 } 1829 1830 /* 1831 * if the packet is at least as big as a REGISTER, go ahead 1832 * and grab the PIM REGISTER header size, to avoid another 1833 * possible m_pullup() later. 1834 * 1835 * PIM_MINLEN == pimhdr + u_int32 == 8 1836 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1837 */ 1838 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1839 1840 /* 1841 * Make sure that the IP6 and PIM headers in contiguous memory, and 1842 * possibly the PIM REGISTER header 1843 */ 1844#ifndef PULLDOWN_TEST 1845 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1846 /* adjust pointer */ 1847 ip6 = mtod(m, struct ip6_hdr *); 1848 1849 /* adjust mbuf to point to the PIM header */ 1850 pim = (struct pim *)((caddr_t)ip6 + off); 1851#else 1852 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1853 if (pim == NULL) { 1854 pim6stat.pim6s_rcv_tooshort++; 1855 return (IPPROTO_DONE); 1856 } 1857#endif 1858 1859#define PIM6_CHECKSUM 1860#ifdef PIM6_CHECKSUM 1861 { 1862 int cksumlen; 1863 1864 /* 1865 * Validate checksum. 1866 * If PIM REGISTER, exclude the data packet 1867 */ 1868 if (pim->pim_type == PIM_REGISTER) 1869 cksumlen = PIM_MINLEN; 1870 else 1871 cksumlen = pimlen; 1872 1873 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1874 ++pim6stat.pim6s_rcv_badsum; 1875#ifdef MRT6DEBUG 1876 if (V_mrt6debug & DEBUG_PIM) 1877 log(LOG_DEBUG, 1878 "pim6_input: invalid checksum\n"); 1879#endif 1880 m_freem(m); 1881 return (IPPROTO_DONE); 1882 } 1883 } 1884#endif /* PIM_CHECKSUM */ 1885 1886 /* PIM version check */ 1887 if (pim->pim_ver != PIM_VERSION) { 1888 ++pim6stat.pim6s_rcv_badversion; 1889#ifdef MRT6DEBUG 1890 log(LOG_ERR, 1891 "pim6_input: incorrect version %d, expecting %d\n", 1892 pim->pim_ver, PIM_VERSION); 1893#endif 1894 m_freem(m); 1895 return (IPPROTO_DONE); 1896 } 1897 1898 if (pim->pim_type == PIM_REGISTER) { 1899 /* 1900 * since this is a REGISTER, we'll make a copy of the register 1901 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1902 * routing daemon. 1903 */ 1904 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1905 1906 struct mbuf *mcp; 1907 struct ip6_hdr *eip6; 1908 u_int32_t *reghdr; 1909 int rc; 1910#ifdef MRT6DEBUG 1911 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1912#endif 1913 1914 ++pim6stat.pim6s_rcv_registers; 1915 1916 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1917#ifdef MRT6DEBUG 1918 if (V_mrt6debug & DEBUG_PIM) 1919 log(LOG_DEBUG, 1920 "pim6_input: register mif not set: %d\n", 1921 reg_mif_num); 1922#endif 1923 m_freem(m); 1924 return (IPPROTO_DONE); 1925 } 1926 1927 reghdr = (u_int32_t *)(pim + 1); 1928 1929 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1930 goto pim6_input_to_daemon; 1931 1932 /* 1933 * Validate length 1934 */ 1935 if (pimlen < PIM6_REG_MINLEN) { 1936 ++pim6stat.pim6s_rcv_tooshort; 1937 ++pim6stat.pim6s_rcv_badregisters; 1938#ifdef MRT6DEBUG 1939 log(LOG_ERR, 1940 "pim6_input: register packet size too " 1941 "small %d from %s\n", 1942 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1943#endif 1944 m_freem(m); 1945 return (IPPROTO_DONE); 1946 } 1947 1948 eip6 = (struct ip6_hdr *) (reghdr + 1); 1949#ifdef MRT6DEBUG 1950 if (V_mrt6debug & DEBUG_PIM) 1951 log(LOG_DEBUG, 1952 "pim6_input[register], eip6: %s -> %s, " 1953 "eip6 plen %d\n", 1954 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1955 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1956 ntohs(eip6->ip6_plen)); 1957#endif 1958 1959 /* verify the version number of the inner packet */ 1960 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1961 ++pim6stat.pim6s_rcv_badregisters; 1962#ifdef MRT6DEBUG 1963 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1964 "of the inner packet\n", 1965 (eip6->ip6_vfc & IPV6_VERSION)); 1966#endif 1967 m_freem(m); 1968 return (IPPROTO_NONE); 1969 } 1970 1971 /* verify the inner packet is destined to a mcast group */ 1972 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1973 ++pim6stat.pim6s_rcv_badregisters; 1974#ifdef MRT6DEBUG 1975 if (V_mrt6debug & DEBUG_PIM) 1976 log(LOG_DEBUG, 1977 "pim6_input: inner packet of register " 1978 "is not multicast %s\n", 1979 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1980#endif 1981 m_freem(m); 1982 return (IPPROTO_DONE); 1983 } 1984 1985 /* 1986 * make a copy of the whole header to pass to the daemon later. 1987 */ 1988 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1989 if (mcp == NULL) { 1990#ifdef MRT6DEBUG 1991 log(LOG_ERR, 1992 "pim6_input: pim register: " 1993 "could not copy register head\n"); 1994#endif 1995 m_freem(m); 1996 return (IPPROTO_DONE); 1997 } 1998 1999 /* 2000 * forward the inner ip6 packet; point m_data at the inner ip6. 2001 */ 2002 m_adj(m, off + PIM_MINLEN); 2003#ifdef MRT6DEBUG 2004 if (V_mrt6debug & DEBUG_PIM) { 2005 log(LOG_DEBUG, 2006 "pim6_input: forwarding decapsulated register: " 2007 "src %s, dst %s, mif %d\n", 2008 ip6_sprintf(ip6bufs, &eip6->ip6_src), 2009 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 2010 reg_mif_num); 2011 } 2012#endif 2013 2014 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 2015 dst.sin6_family, 0); 2016 2017 /* prepare the register head to send to the mrouting daemon */ 2018 m = mcp; 2019 } 2020 2021 /* 2022 * Pass the PIM message up to the daemon; if it is a register message 2023 * pass the 'head' only up to the daemon. This includes the 2024 * encapsulator ip6 header, pim header, register header and the 2025 * encapsulated ip6 header. 2026 */ 2027 pim6_input_to_daemon: 2028 rip6_input(&m, offp, proto); 2029 return (IPPROTO_DONE); 2030} 2031 2032static int 2033ip6_mroute_modevent(module_t mod, int type, void *unused) 2034{ 2035 2036 switch (type) { 2037 case MOD_LOAD: 2038 MROUTER6_LOCK_INIT(); 2039 MFC6_LOCK_INIT(); 2040 MIF6_LOCK_INIT(); 2041 2042 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 2043 pim6_encapcheck, 2044 (const struct protosw *)&in6_pim_protosw, NULL); 2045 if (pim6_encap_cookie == NULL) { 2046 printf("ip6_mroute: unable to attach pim6 encap\n"); 2047 MIF6_LOCK_DESTROY(); 2048 MFC6_LOCK_DESTROY(); 2049 MROUTER6_LOCK_DESTROY(); 2050 return (EINVAL); 2051 } 2052 2053 ip6_mforward = X_ip6_mforward; 2054 ip6_mrouter_done = X_ip6_mrouter_done; 2055 ip6_mrouter_get = X_ip6_mrouter_get; 2056 ip6_mrouter_set = X_ip6_mrouter_set; 2057 mrt6_ioctl = X_mrt6_ioctl; 2058 break; 2059 2060 case MOD_UNLOAD:
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2059 if (ip6_mrouter != NULL)
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2061 if (V_ip6_mrouter != NULL) |
2062 return EINVAL; 2063 2064 if (pim6_encap_cookie) { 2065 encap_detach(pim6_encap_cookie); 2066 pim6_encap_cookie = NULL; 2067 } 2068 X_ip6_mrouter_done(); 2069 ip6_mforward = NULL; 2070 ip6_mrouter_done = NULL; 2071 ip6_mrouter_get = NULL; 2072 ip6_mrouter_set = NULL; 2073 mrt6_ioctl = NULL; 2074 2075 MIF6_LOCK_DESTROY(); 2076 MFC6_LOCK_DESTROY(); 2077 MROUTER6_LOCK_DESTROY(); 2078 break; 2079 2080 default: 2081 return (EOPNOTSUPP); 2082 } 2083 2084 return (0); 2085} 2086 2087static moduledata_t ip6_mroutemod = { 2088 "ip6_mroute", 2089 ip6_mroute_modevent, 2090 0 2091}; 2092 2093DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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