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("$FreeBSD$"); 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/protosw.h> 96 #include <sys/signalvar.h> 97 #include <sys/socket.h> 98 #include <sys/socketvar.h> 99 #include <sys/sockio.h> 100 #include <sys/sx.h> 101 #include <sys/sysctl.h> 102 #include <sys/syslog.h> 103 #include <sys/systm.h> 104 #include <sys/time.h> 105 #include <sys/vimage.h> 106 107 #include <net/if.h> 108 #include <net/if_types.h> 109 #include <net/raw_cb.h> 110 #include <net/route.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/vinet.h> 117 118 #include <netinet/ip6.h> 119 #include <netinet6/ip6_var.h> 120 #include <netinet6/scope6_var.h> 121 #include <netinet6/nd6.h> 122 #include <netinet6/ip6_mroute.h> 123 #include <netinet6/ip6protosw.h> 124 #include <netinet6/pim6.h> 125 #include <netinet6/pim6_var.h> 126 #include <netinet6/vinet6.h> 127 128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 129 130 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 131 #define M_HASCL(m) ((m)->m_flags & M_EXT) 132 133 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 134 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 135 136 static void pim6_init(void); 137 static int set_pim6(int *); 138 static int socket_send __P((struct socket *, struct mbuf *, 139 struct sockaddr_in6 *)); 140 static int register_send __P((struct ip6_hdr *, struct mif6 *, 141 struct mbuf *)); 142 143 extern struct domain inet6domain; 144 145 /* XXX: referenced from ip_mroute.c for dynamically loading this code. */ 146 struct ip6protosw in6_pim_protosw = { 147 .pr_type = SOCK_RAW, 148 .pr_domain = &inet6domain, 149 .pr_protocol = IPPROTO_PIM, 150 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 151 .pr_input = pim6_input, 152 .pr_output = rip6_output, 153 .pr_ctloutput = rip6_ctloutput, 154 .pr_init = pim6_init, 155 .pr_usrreqs = &rip6_usrreqs 156 }; 157 158 #ifdef VIMAGE_GLOBALS 159 static int ip6_mrouter_ver; 160 #endif 161 162 SYSCTL_DECL(_net_inet6); 163 SYSCTL_DECL(_net_inet6_ip6); 164 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 165 166 static struct mrt6stat mrt6stat; 167 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 168 &mrt6stat, mrt6stat, 169 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 170 171 #define NO_RTE_FOUND 0x1 172 #define RTE_FOUND 0x2 173 174 static struct mf6c *mf6ctable[MF6CTBLSIZ]; 175 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 176 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 177 "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 178 "netinet6/ip6_mroute.h)"); 179 180 static u_char n6expire[MF6CTBLSIZ]; 181 182 static struct mif6 mif6table[MAXMIFS]; 183 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 184 &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]", 185 "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)"); 186 187 #ifdef MRT6DEBUG 188 #ifdef VIMAGE_GLOBALS 189 static u_int mrt6debug = 0; /* debug level */ 190 #endif 191 #define DEBUG_MFC 0x02 192 #define DEBUG_FORWARD 0x04 193 #define DEBUG_EXPIRE 0x08 194 #define DEBUG_XMIT 0x10 195 #define DEBUG_REG 0x20 196 #define DEBUG_PIM 0x40 197 #endif 198 199 static void expire_upcalls(void *); 200 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 201 #define UPCALL_EXPIRE 6 /* number of timeouts */ 202 203 #ifdef INET 204 #ifdef MROUTING 205 extern struct socket *ip_mrouter; 206 #endif 207 #endif 208 209 /* 210 * 'Interfaces' associated with decapsulator (so we can tell 211 * packets that went through it from ones that get reflected 212 * by a broken gateway). Different from IPv4 register_if, 213 * these interfaces are linked into the system ifnet list, 214 * because per-interface IPv6 statistics are maintained in 215 * ifp->if_afdata. But it does not have any routes point 216 * to them. I.e., packets can't be sent this way. They 217 * only exist as a placeholder for multicast source 218 * verification. 219 */ 220 static struct ifnet *multicast_register_if6; 221 222 #define ENCAP_HOPS 64 223 224 /* 225 * Private variables. 226 */ 227 static mifi_t nummifs = 0; 228 static mifi_t reg_mif_num = (mifi_t)-1; 229 230 static struct pim6stat pim6stat; 231 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 232 &pim6stat, pim6stat, 233 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 234 235 #ifdef VIMAGE_GLOBALS 236 static int pim6; 237 #endif 238 239 /* 240 * Hash function for a source, group entry 241 */ 242 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 243 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 244 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 245 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 246 247 /* 248 * Find a route for a given origin IPv6 address and Multicast group address. 249 */ 250 #define MF6CFIND(o, g, rt) do { \ 251 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 252 rt = NULL; \ 253 mrt6stat.mrt6s_mfc_lookups++; \ 254 while (_rt) { \ 255 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 256 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 257 (_rt->mf6c_stall == NULL)) { \ 258 rt = _rt; \ 259 break; \ 260 } \ 261 _rt = _rt->mf6c_next; \ 262 } \ 263 if (rt == NULL) { \ 264 mrt6stat.mrt6s_mfc_misses++; \ 265 } \ 266 } while (/*CONSTCOND*/ 0) 267 268 /* 269 * Macros to compute elapsed time efficiently 270 * Borrowed from Van Jacobson's scheduling code 271 * XXX: replace with timersub() ? 272 */ 273 #define TV_DELTA(a, b, delta) do { \ 274 int xxs; \ 275 \ 276 delta = (a).tv_usec - (b).tv_usec; \ 277 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 278 switch (xxs) { \ 279 case 2: \ 280 delta += 1000000; \ 281 /* FALLTHROUGH */ \ 282 case 1: \ 283 delta += 1000000; \ 284 break; \ 285 default: \ 286 delta += (1000000 * xxs); \ 287 } \ 288 } \ 289 } while (/*CONSTCOND*/ 0) 290 291 /* XXX: replace with timercmp(a, b, <) ? */ 292 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 293 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 294 295 #ifdef UPCALL_TIMING 296 #define UPCALL_MAX 50 297 static u_long upcall_data[UPCALL_MAX + 1]; 298 static void collate(); 299 #endif /* UPCALL_TIMING */ 300 301 static int get_sg_cnt(struct sioc_sg_req6 *); 302 static int get_mif6_cnt(struct sioc_mif_req6 *); 303 static int ip6_mrouter_init(struct socket *, int, int); 304 static int add_m6if(struct mif6ctl *); 305 static int del_m6if(mifi_t *); 306 static int add_m6fc(struct mf6cctl *); 307 static int del_m6fc(struct mf6cctl *); 308 309 static struct callout expire_upcalls_ch; 310 311 int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m); 312 int X_ip6_mrouter_done(void); 313 int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt); 314 int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt); 315 int X_mrt6_ioctl(int cmd, caddr_t data); 316 317 static void 318 pim6_init(void) 319 { 320 INIT_VNET_INET6(curvnet); 321 322 V_ip6_mrouter_ver = 0; 323 #ifdef MRT6DEBUG 324 V_mrt6debug = 0; /* debug level */ 325 #endif 326 } 327 328 /* 329 * Handle MRT setsockopt commands to modify the multicast routing tables. 330 */ 331 int 332 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 333 { 334 int error = 0; 335 int optval; 336 struct mif6ctl mifc; 337 struct mf6cctl mfcc; 338 mifi_t mifi; 339 340 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 341 return (EACCES); 342 343 switch (sopt->sopt_name) { 344 case MRT6_INIT: 345 #ifdef MRT6_OINIT 346 case MRT6_OINIT: 347 #endif 348 error = sooptcopyin(sopt, &optval, sizeof(optval), 349 sizeof(optval)); 350 if (error) 351 break; 352 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 353 break; 354 case MRT6_DONE: 355 error = X_ip6_mrouter_done(); 356 break; 357 case MRT6_ADD_MIF: 358 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 359 if (error) 360 break; 361 error = add_m6if(&mifc); 362 break; 363 case MRT6_ADD_MFC: 364 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 365 if (error) 366 break; 367 error = add_m6fc(&mfcc); 368 break; 369 case MRT6_DEL_MFC: 370 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 371 if (error) 372 break; 373 error = del_m6fc(&mfcc); 374 break; 375 case MRT6_DEL_MIF: 376 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 377 if (error) 378 break; 379 error = del_m6if(&mifi); 380 break; 381 case MRT6_PIM: 382 error = sooptcopyin(sopt, &optval, sizeof(optval), 383 sizeof(optval)); 384 if (error) 385 break; 386 error = set_pim6(&optval); 387 break; 388 default: 389 error = EOPNOTSUPP; 390 break; 391 } 392 393 return (error); 394 } 395 396 /* 397 * Handle MRT getsockopt commands 398 */ 399 int 400 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 401 { 402 INIT_VNET_INET6(curvnet); 403 int error = 0; 404 405 if (so != ip6_mrouter) 406 return (EACCES); 407 408 switch (sopt->sopt_name) { 409 case MRT6_PIM: 410 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 411 break; 412 } 413 return (error); 414 } 415 416 /* 417 * Handle ioctl commands to obtain information from the cache 418 */ 419 int 420 X_mrt6_ioctl(int cmd, caddr_t data) 421 { 422 switch (cmd) { 423 case SIOCGETSGCNT_IN6: 424 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 425 case SIOCGETMIFCNT_IN6: 426 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 427 default: 428 return (EINVAL); 429 } 430 } 431 432 /* 433 * returns the packet, byte, rpf-failure count for the source group provided 434 */ 435 static int 436 get_sg_cnt(struct sioc_sg_req6 *req) 437 { 438 struct mf6c *rt; 439 int s; 440 441 s = splnet(); 442 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 443 splx(s); 444 if (rt != NULL) { 445 req->pktcnt = rt->mf6c_pkt_cnt; 446 req->bytecnt = rt->mf6c_byte_cnt; 447 req->wrong_if = rt->mf6c_wrong_if; 448 } else 449 return (ESRCH); 450 #if 0 451 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 452 #endif 453 454 return (0); 455 } 456 457 /* 458 * returns the input and output packet and byte counts on the mif provided 459 */ 460 static int 461 get_mif6_cnt(struct sioc_mif_req6 *req) 462 { 463 mifi_t mifi = req->mifi; 464 465 if (mifi >= nummifs) 466 return (EINVAL); 467 468 req->icount = mif6table[mifi].m6_pkt_in; 469 req->ocount = mif6table[mifi].m6_pkt_out; 470 req->ibytes = mif6table[mifi].m6_bytes_in; 471 req->obytes = mif6table[mifi].m6_bytes_out; 472 473 return (0); 474 } 475 476 static int 477 set_pim6(int *i) 478 { 479 INIT_VNET_INET6(curvnet); 480 if ((*i != 1) && (*i != 0)) 481 return (EINVAL); 482 483 V_pim6 = *i; 484 485 return (0); 486 } 487 488 /* 489 * Enable multicast routing 490 */ 491 static int 492 ip6_mrouter_init(struct socket *so, int v, int cmd) 493 { 494 INIT_VNET_INET6(curvnet); 495 496 #ifdef MRT6DEBUG 497 if (V_mrt6debug) 498 log(LOG_DEBUG, 499 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 500 so->so_type, so->so_proto->pr_protocol); 501 #endif 502 503 if (so->so_type != SOCK_RAW || 504 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 505 return (EOPNOTSUPP); 506 507 if (v != 1) 508 return (ENOPROTOOPT); 509 510 if (ip6_mrouter != NULL) 511 return (EADDRINUSE); 512 513 ip6_mrouter = so; 514 V_ip6_mrouter_ver = cmd; 515 516 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 517 bzero((caddr_t)n6expire, sizeof(n6expire)); 518 519 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 520 521 callout_init(&expire_upcalls_ch, 0); 522 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 523 expire_upcalls, NULL); 524 525 #ifdef MRT6DEBUG 526 if (V_mrt6debug) 527 log(LOG_DEBUG, "ip6_mrouter_init\n"); 528 #endif 529 530 return (0); 531 } 532 533 /* 534 * Disable multicast routing 535 */ 536 int 537 X_ip6_mrouter_done(void) 538 { 539 INIT_VNET_INET6(curvnet); 540 mifi_t mifi; 541 int i; 542 struct mf6c *rt; 543 struct rtdetq *rte; 544 int s; 545 546 s = splnet(); 547 548 /* 549 * For each phyint in use, disable promiscuous reception of all IPv6 550 * multicasts. 551 */ 552 #ifdef INET 553 #ifdef MROUTING 554 /* 555 * If there is still IPv4 multicast routing daemon, 556 * we remain interfaces to receive all muliticasted packets. 557 * XXX: there may be an interface in which the IPv4 multicast 558 * daemon is not interested... 559 */ 560 if (!V_ip_mrouter) 561 #endif 562 #endif 563 { 564 for (mifi = 0; mifi < nummifs; mifi++) { 565 if (mif6table[mifi].m6_ifp && 566 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 567 if_allmulti(mif6table[mifi].m6_ifp, 0); 568 } 569 } 570 } 571 bzero((caddr_t)mif6table, sizeof(mif6table)); 572 nummifs = 0; 573 574 V_pim6 = 0; /* used to stub out/in pim specific code */ 575 576 callout_stop(&expire_upcalls_ch); 577 578 /* 579 * Free all multicast forwarding cache entries. 580 */ 581 for (i = 0; i < MF6CTBLSIZ; i++) { 582 rt = mf6ctable[i]; 583 while (rt) { 584 struct mf6c *frt; 585 586 for (rte = rt->mf6c_stall; rte != NULL; ) { 587 struct rtdetq *n = rte->next; 588 589 m_free(rte->m); 590 free(rte, M_MRTABLE6); 591 rte = n; 592 } 593 frt = rt; 594 rt = rt->mf6c_next; 595 free(frt, M_MRTABLE6); 596 } 597 } 598 599 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 600 601 /* 602 * Reset register interface 603 */ 604 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 605 if_detach(multicast_register_if6); 606 if_free(multicast_register_if6); 607 reg_mif_num = (mifi_t)-1; 608 multicast_register_if6 = NULL; 609 } 610 611 ip6_mrouter = NULL; 612 V_ip6_mrouter_ver = 0; 613 614 splx(s); 615 616 #ifdef MRT6DEBUG 617 if (V_mrt6debug) 618 log(LOG_DEBUG, "ip6_mrouter_done\n"); 619 #endif 620 621 return (0); 622 } 623 624 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 625 626 /* 627 * Add a mif to the mif table 628 */ 629 static int 630 add_m6if(struct mif6ctl *mifcp) 631 { 632 INIT_VNET_NET(curvnet); 633 struct mif6 *mifp; 634 struct ifnet *ifp; 635 int error, s; 636 637 if (mifcp->mif6c_mifi >= MAXMIFS) 638 return (EINVAL); 639 mifp = mif6table + mifcp->mif6c_mifi; 640 if (mifp->m6_ifp) 641 return (EADDRINUSE); /* XXX: is it appropriate? */ 642 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) 643 return (ENXIO); 644 ifp = ifnet_byindex(mifcp->mif6c_pifi); 645 646 if (mifcp->mif6c_flags & MIFF_REGISTER) { 647 if (reg_mif_num == (mifi_t)-1) { 648 ifp = if_alloc(IFT_OTHER); 649 650 if_initname(ifp, "register_mif", 0); 651 ifp->if_flags |= IFF_LOOPBACK; 652 if_attach(ifp); 653 multicast_register_if6 = ifp; 654 reg_mif_num = mifcp->mif6c_mifi; 655 /* 656 * it is impossible to guess the ifindex of the 657 * register interface. So mif6c_pifi is automatically 658 * calculated. 659 */ 660 mifcp->mif6c_pifi = ifp->if_index; 661 } else { 662 ifp = multicast_register_if6; 663 } 664 665 } /* if REGISTER */ 666 else { 667 /* Make sure the interface supports multicast */ 668 if ((ifp->if_flags & IFF_MULTICAST) == 0) 669 return (EOPNOTSUPP); 670 671 s = splnet(); 672 error = if_allmulti(ifp, 1); 673 splx(s); 674 if (error) 675 return (error); 676 } 677 678 s = splnet(); 679 mifp->m6_flags = mifcp->mif6c_flags; 680 mifp->m6_ifp = ifp; 681 682 /* initialize per mif pkt counters */ 683 mifp->m6_pkt_in = 0; 684 mifp->m6_pkt_out = 0; 685 mifp->m6_bytes_in = 0; 686 mifp->m6_bytes_out = 0; 687 splx(s); 688 689 /* Adjust nummifs up if the mifi is higher than nummifs */ 690 if (nummifs <= mifcp->mif6c_mifi) 691 nummifs = mifcp->mif6c_mifi + 1; 692 693 #ifdef MRT6DEBUG 694 if (V_mrt6debug) 695 log(LOG_DEBUG, 696 "add_mif #%d, phyint %s\n", 697 mifcp->mif6c_mifi, 698 ifp->if_xname); 699 #endif 700 701 return (0); 702 } 703 704 /* 705 * Delete a mif from the mif table 706 */ 707 static int 708 del_m6if(mifi_t *mifip) 709 { 710 struct mif6 *mifp = mif6table + *mifip; 711 mifi_t mifi; 712 struct ifnet *ifp; 713 int s; 714 715 if (*mifip >= nummifs) 716 return (EINVAL); 717 if (mifp->m6_ifp == NULL) 718 return (EINVAL); 719 720 s = splnet(); 721 722 if (!(mifp->m6_flags & MIFF_REGISTER)) { 723 /* 724 * XXX: what if there is yet IPv4 multicast daemon 725 * using the interface? 726 */ 727 ifp = mifp->m6_ifp; 728 729 if_allmulti(ifp, 0); 730 } else { 731 if (reg_mif_num != (mifi_t)-1 && 732 multicast_register_if6 != NULL) { 733 if_detach(multicast_register_if6); 734 if_free(multicast_register_if6); 735 reg_mif_num = (mifi_t)-1; 736 multicast_register_if6 = NULL; 737 } 738 } 739 740 bzero((caddr_t)mifp, sizeof(*mifp)); 741 742 /* Adjust nummifs down */ 743 for (mifi = nummifs; mifi > 0; mifi--) 744 if (mif6table[mifi - 1].m6_ifp) 745 break; 746 nummifs = mifi; 747 748 splx(s); 749 750 #ifdef MRT6DEBUG 751 if (V_mrt6debug) 752 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 753 #endif 754 755 return (0); 756 } 757 758 /* 759 * Add an mfc entry 760 */ 761 static int 762 add_m6fc(struct mf6cctl *mfccp) 763 { 764 struct mf6c *rt; 765 u_long hash; 766 struct rtdetq *rte; 767 u_short nstl; 768 int s; 769 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 770 771 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 772 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 773 774 /* If an entry already exists, just update the fields */ 775 if (rt) { 776 #ifdef MRT6DEBUG 777 if (V_mrt6debug & DEBUG_MFC) { 778 log(LOG_DEBUG, 779 "add_m6fc no upcall h %d o %s g %s p %x\n", 780 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 781 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 782 mfccp->mf6cc_parent); 783 } 784 #endif 785 786 s = splnet(); 787 rt->mf6c_parent = mfccp->mf6cc_parent; 788 rt->mf6c_ifset = mfccp->mf6cc_ifset; 789 splx(s); 790 return (0); 791 } 792 793 /* 794 * Find the entry for which the upcall was made and update 795 */ 796 s = splnet(); 797 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 798 mfccp->mf6cc_mcastgrp.sin6_addr); 799 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 800 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 801 &mfccp->mf6cc_origin.sin6_addr) && 802 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 803 &mfccp->mf6cc_mcastgrp.sin6_addr) && 804 (rt->mf6c_stall != NULL)) { 805 806 if (nstl++) 807 log(LOG_ERR, 808 "add_m6fc: %s o %s g %s p %x dbx %p\n", 809 "multiple kernel entries", 810 ip6_sprintf(ip6bufo, 811 &mfccp->mf6cc_origin.sin6_addr), 812 ip6_sprintf(ip6bufg, 813 &mfccp->mf6cc_mcastgrp.sin6_addr), 814 mfccp->mf6cc_parent, rt->mf6c_stall); 815 816 #ifdef MRT6DEBUG 817 if (V_mrt6debug & DEBUG_MFC) 818 log(LOG_DEBUG, 819 "add_m6fc o %s g %s p %x dbg %x\n", 820 ip6_sprintf(ip6bufo, 821 &mfccp->mf6cc_origin.sin6_addr), 822 ip6_sprintf(ip6bufg, 823 &mfccp->mf6cc_mcastgrp.sin6_addr), 824 mfccp->mf6cc_parent, rt->mf6c_stall); 825 #endif 826 827 rt->mf6c_origin = mfccp->mf6cc_origin; 828 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 829 rt->mf6c_parent = mfccp->mf6cc_parent; 830 rt->mf6c_ifset = mfccp->mf6cc_ifset; 831 /* initialize pkt counters per src-grp */ 832 rt->mf6c_pkt_cnt = 0; 833 rt->mf6c_byte_cnt = 0; 834 rt->mf6c_wrong_if = 0; 835 836 rt->mf6c_expire = 0; /* Don't clean this guy up */ 837 n6expire[hash]--; 838 839 /* free packets Qed at the end of this entry */ 840 for (rte = rt->mf6c_stall; rte != NULL; ) { 841 struct rtdetq *n = rte->next; 842 ip6_mdq(rte->m, rte->ifp, rt); 843 m_freem(rte->m); 844 #ifdef UPCALL_TIMING 845 collate(&(rte->t)); 846 #endif /* UPCALL_TIMING */ 847 free(rte, M_MRTABLE6); 848 rte = n; 849 } 850 rt->mf6c_stall = NULL; 851 } 852 } 853 854 /* 855 * It is possible that an entry is being inserted without an upcall 856 */ 857 if (nstl == 0) { 858 #ifdef MRT6DEBUG 859 if (V_mrt6debug & DEBUG_MFC) 860 log(LOG_DEBUG, 861 "add_mfc no upcall h %d o %s g %s p %x\n", 862 hash, 863 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 864 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 865 mfccp->mf6cc_parent); 866 #endif 867 868 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 869 870 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 871 &mfccp->mf6cc_origin.sin6_addr)&& 872 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 873 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 874 875 rt->mf6c_origin = mfccp->mf6cc_origin; 876 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 877 rt->mf6c_parent = mfccp->mf6cc_parent; 878 rt->mf6c_ifset = mfccp->mf6cc_ifset; 879 /* initialize pkt counters per src-grp */ 880 rt->mf6c_pkt_cnt = 0; 881 rt->mf6c_byte_cnt = 0; 882 rt->mf6c_wrong_if = 0; 883 884 if (rt->mf6c_expire) 885 n6expire[hash]--; 886 rt->mf6c_expire = 0; 887 } 888 } 889 if (rt == NULL) { 890 /* no upcall, so make a new entry */ 891 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 892 M_NOWAIT); 893 if (rt == NULL) { 894 splx(s); 895 return (ENOBUFS); 896 } 897 898 /* insert new entry at head of hash chain */ 899 rt->mf6c_origin = mfccp->mf6cc_origin; 900 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 901 rt->mf6c_parent = mfccp->mf6cc_parent; 902 rt->mf6c_ifset = mfccp->mf6cc_ifset; 903 /* initialize pkt counters per src-grp */ 904 rt->mf6c_pkt_cnt = 0; 905 rt->mf6c_byte_cnt = 0; 906 rt->mf6c_wrong_if = 0; 907 rt->mf6c_expire = 0; 908 rt->mf6c_stall = NULL; 909 910 /* link into table */ 911 rt->mf6c_next = mf6ctable[hash]; 912 mf6ctable[hash] = rt; 913 } 914 } 915 splx(s); 916 return (0); 917 } 918 919 #ifdef UPCALL_TIMING 920 /* 921 * collect delay statistics on the upcalls 922 */ 923 static void 924 collate(struct timeval *t) 925 { 926 u_long d; 927 struct timeval tp; 928 u_long delta; 929 930 GET_TIME(tp); 931 932 if (TV_LT(*t, tp)) 933 { 934 TV_DELTA(tp, *t, delta); 935 936 d = delta >> 10; 937 if (d > UPCALL_MAX) 938 d = UPCALL_MAX; 939 940 ++upcall_data[d]; 941 } 942 } 943 #endif /* UPCALL_TIMING */ 944 945 /* 946 * Delete an mfc entry 947 */ 948 static int 949 del_m6fc(struct mf6cctl *mfccp) 950 { 951 struct sockaddr_in6 origin; 952 struct sockaddr_in6 mcastgrp; 953 struct mf6c *rt; 954 struct mf6c **nptr; 955 u_long hash; 956 int s; 957 958 origin = mfccp->mf6cc_origin; 959 mcastgrp = mfccp->mf6cc_mcastgrp; 960 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 961 962 #ifdef MRT6DEBUG 963 if (V_mrt6debug & DEBUG_MFC) { 964 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 965 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 966 ip6_sprintf(ip6bufo, &origin.sin6_addr), 967 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 968 } 969 #endif 970 971 s = splnet(); 972 973 nptr = &mf6ctable[hash]; 974 while ((rt = *nptr) != NULL) { 975 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 976 &rt->mf6c_origin.sin6_addr) && 977 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 978 &rt->mf6c_mcastgrp.sin6_addr) && 979 rt->mf6c_stall == NULL) 980 break; 981 982 nptr = &rt->mf6c_next; 983 } 984 if (rt == NULL) { 985 splx(s); 986 return (EADDRNOTAVAIL); 987 } 988 989 *nptr = rt->mf6c_next; 990 free(rt, M_MRTABLE6); 991 992 splx(s); 993 994 return (0); 995 } 996 997 static int 998 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 999 { 1000 1001 if (s) { 1002 if (sbappendaddr(&s->so_rcv, 1003 (struct sockaddr *)src, 1004 mm, (struct mbuf *)0) != 0) { 1005 sorwakeup(s); 1006 return (0); 1007 } 1008 } 1009 m_freem(mm); 1010 return (-1); 1011 } 1012 1013 /* 1014 * IPv6 multicast forwarding function. This function assumes that the packet 1015 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1016 * pointed to by "ifp", and the packet is to be relayed to other networks 1017 * that have members of the packet's destination IPv6 multicast group. 1018 * 1019 * The packet is returned unscathed to the caller, unless it is 1020 * erroneous, in which case a non-zero return value tells the caller to 1021 * discard it. 1022 * 1023 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1024 * this function is called in the originating context (i.e., not when 1025 * forwarding a packet from other node). ip6_output(), which is currently the 1026 * only function that calls this function is called in the originating context, 1027 * explicitly ensures this condition. It is caller's responsibility to ensure 1028 * that if this function is called from somewhere else in the originating 1029 * context in the future. 1030 */ 1031 int 1032 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1033 { 1034 INIT_VNET_INET6(curvnet); 1035 struct mf6c *rt; 1036 struct mif6 *mifp; 1037 struct mbuf *mm; 1038 int s; 1039 mifi_t mifi; 1040 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1041 1042 #ifdef MRT6DEBUG 1043 if (V_mrt6debug & DEBUG_FORWARD) 1044 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1045 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1046 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1047 ifp->if_index); 1048 #endif 1049 1050 /* 1051 * Don't forward a packet with Hop limit of zero or one, 1052 * or a packet destined to a local-only group. 1053 */ 1054 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1055 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1056 return (0); 1057 ip6->ip6_hlim--; 1058 1059 /* 1060 * Source address check: do not forward packets with unspecified 1061 * source. It was discussed in July 2000, on ipngwg mailing list. 1062 * This is rather more serious than unicast cases, because some 1063 * MLD packets can be sent with the unspecified source address 1064 * (although such packets must normally set 1 to the hop limit field). 1065 */ 1066 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1067 V_ip6stat.ip6s_cantforward++; 1068 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1069 V_ip6_log_time = time_second; 1070 log(LOG_DEBUG, 1071 "cannot forward " 1072 "from %s to %s nxt %d received on %s\n", 1073 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1074 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1075 ip6->ip6_nxt, 1076 if_name(m->m_pkthdr.rcvif)); 1077 } 1078 return (0); 1079 } 1080 1081 /* 1082 * Determine forwarding mifs from the forwarding cache table 1083 */ 1084 s = splnet(); 1085 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1086 1087 /* Entry exists, so forward if necessary */ 1088 if (rt) { 1089 splx(s); 1090 return (ip6_mdq(m, ifp, rt)); 1091 } else { 1092 /* 1093 * If we don't have a route for packet's origin, 1094 * Make a copy of the packet & 1095 * send message to routing daemon 1096 */ 1097 1098 struct mbuf *mb0; 1099 struct rtdetq *rte; 1100 u_long hash; 1101 /* int i, npkts;*/ 1102 #ifdef UPCALL_TIMING 1103 struct timeval tp; 1104 1105 GET_TIME(tp); 1106 #endif /* UPCALL_TIMING */ 1107 1108 mrt6stat.mrt6s_no_route++; 1109 #ifdef MRT6DEBUG 1110 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1111 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1112 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1113 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1114 #endif 1115 1116 /* 1117 * Allocate mbufs early so that we don't do extra work if we 1118 * are just going to fail anyway. 1119 */ 1120 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1121 M_NOWAIT); 1122 if (rte == NULL) { 1123 splx(s); 1124 return (ENOBUFS); 1125 } 1126 mb0 = m_copy(m, 0, M_COPYALL); 1127 /* 1128 * Pullup packet header if needed before storing it, 1129 * as other references may modify it in the meantime. 1130 */ 1131 if (mb0 && 1132 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1133 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1134 if (mb0 == NULL) { 1135 free(rte, M_MRTABLE6); 1136 splx(s); 1137 return (ENOBUFS); 1138 } 1139 1140 /* is there an upcall waiting for this packet? */ 1141 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1142 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1143 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1144 &rt->mf6c_origin.sin6_addr) && 1145 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1146 &rt->mf6c_mcastgrp.sin6_addr) && 1147 (rt->mf6c_stall != NULL)) 1148 break; 1149 } 1150 1151 if (rt == NULL) { 1152 struct mrt6msg *im; 1153 #ifdef MRT6_OINIT 1154 struct omrt6msg *oim; 1155 #endif 1156 1157 /* no upcall, so make a new entry */ 1158 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1159 M_NOWAIT); 1160 if (rt == NULL) { 1161 free(rte, M_MRTABLE6); 1162 m_freem(mb0); 1163 splx(s); 1164 return (ENOBUFS); 1165 } 1166 /* 1167 * Make a copy of the header to send to the user 1168 * level process 1169 */ 1170 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1171 1172 if (mm == NULL) { 1173 free(rte, M_MRTABLE6); 1174 m_freem(mb0); 1175 free(rt, M_MRTABLE6); 1176 splx(s); 1177 return (ENOBUFS); 1178 } 1179 1180 /* 1181 * Send message to routing daemon 1182 */ 1183 sin6.sin6_addr = ip6->ip6_src; 1184 1185 im = NULL; 1186 #ifdef MRT6_OINIT 1187 oim = NULL; 1188 #endif 1189 switch (V_ip6_mrouter_ver) { 1190 #ifdef MRT6_OINIT 1191 case MRT6_OINIT: 1192 oim = mtod(mm, struct omrt6msg *); 1193 oim->im6_msgtype = MRT6MSG_NOCACHE; 1194 oim->im6_mbz = 0; 1195 break; 1196 #endif 1197 case MRT6_INIT: 1198 im = mtod(mm, struct mrt6msg *); 1199 im->im6_msgtype = MRT6MSG_NOCACHE; 1200 im->im6_mbz = 0; 1201 break; 1202 default: 1203 free(rte, M_MRTABLE6); 1204 m_freem(mb0); 1205 free(rt, M_MRTABLE6); 1206 splx(s); 1207 return (EINVAL); 1208 } 1209 1210 #ifdef MRT6DEBUG 1211 if (V_mrt6debug & DEBUG_FORWARD) 1212 log(LOG_DEBUG, 1213 "getting the iif info in the kernel\n"); 1214 #endif 1215 1216 for (mifp = mif6table, mifi = 0; 1217 mifi < nummifs && mifp->m6_ifp != ifp; 1218 mifp++, mifi++) 1219 ; 1220 1221 switch (V_ip6_mrouter_ver) { 1222 #ifdef MRT6_OINIT 1223 case MRT6_OINIT: 1224 oim->im6_mif = mifi; 1225 break; 1226 #endif 1227 case MRT6_INIT: 1228 im->im6_mif = mifi; 1229 break; 1230 } 1231 1232 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1233 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1234 "socket queue full\n"); 1235 mrt6stat.mrt6s_upq_sockfull++; 1236 free(rte, M_MRTABLE6); 1237 m_freem(mb0); 1238 free(rt, M_MRTABLE6); 1239 splx(s); 1240 return (ENOBUFS); 1241 } 1242 1243 mrt6stat.mrt6s_upcalls++; 1244 1245 /* insert new entry at head of hash chain */ 1246 bzero(rt, sizeof(*rt)); 1247 rt->mf6c_origin.sin6_family = AF_INET6; 1248 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1249 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1250 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1251 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1252 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1253 rt->mf6c_expire = UPCALL_EXPIRE; 1254 n6expire[hash]++; 1255 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1256 1257 /* link into table */ 1258 rt->mf6c_next = mf6ctable[hash]; 1259 mf6ctable[hash] = rt; 1260 /* Add this entry to the end of the queue */ 1261 rt->mf6c_stall = rte; 1262 } else { 1263 /* determine if q has overflowed */ 1264 struct rtdetq **p; 1265 int npkts = 0; 1266 1267 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1268 if (++npkts > MAX_UPQ6) { 1269 mrt6stat.mrt6s_upq_ovflw++; 1270 free(rte, M_MRTABLE6); 1271 m_freem(mb0); 1272 splx(s); 1273 return (0); 1274 } 1275 1276 /* Add this entry to the end of the queue */ 1277 *p = rte; 1278 } 1279 1280 rte->next = NULL; 1281 rte->m = mb0; 1282 rte->ifp = ifp; 1283 #ifdef UPCALL_TIMING 1284 rte->t = tp; 1285 #endif /* UPCALL_TIMING */ 1286 1287 splx(s); 1288 1289 return (0); 1290 } 1291 } 1292 1293 /* 1294 * Clean up cache entries if upcalls are not serviced 1295 * Call from the Slow Timeout mechanism, every half second. 1296 */ 1297 static void 1298 expire_upcalls(void *unused) 1299 { 1300 struct rtdetq *rte; 1301 struct mf6c *mfc, **nptr; 1302 int i; 1303 int s; 1304 1305 s = splnet(); 1306 for (i = 0; i < MF6CTBLSIZ; i++) { 1307 if (n6expire[i] == 0) 1308 continue; 1309 nptr = &mf6ctable[i]; 1310 while ((mfc = *nptr) != NULL) { 1311 rte = mfc->mf6c_stall; 1312 /* 1313 * Skip real cache entries 1314 * Make sure it wasn't marked to not expire (shouldn't happen) 1315 * If it expires now 1316 */ 1317 if (rte != NULL && 1318 mfc->mf6c_expire != 0 && 1319 --mfc->mf6c_expire == 0) { 1320 #ifdef MRT6DEBUG 1321 if (V_mrt6debug & DEBUG_EXPIRE) { 1322 char ip6bufo[INET6_ADDRSTRLEN]; 1323 char ip6bufg[INET6_ADDRSTRLEN]; 1324 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1325 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1326 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1327 } 1328 #endif 1329 /* 1330 * drop all the packets 1331 * free the mbuf with the pkt, if, timing info 1332 */ 1333 do { 1334 struct rtdetq *n = rte->next; 1335 m_freem(rte->m); 1336 free(rte, M_MRTABLE6); 1337 rte = n; 1338 } while (rte != NULL); 1339 mrt6stat.mrt6s_cache_cleanups++; 1340 n6expire[i]--; 1341 1342 *nptr = mfc->mf6c_next; 1343 free(mfc, M_MRTABLE6); 1344 } else { 1345 nptr = &mfc->mf6c_next; 1346 } 1347 } 1348 } 1349 splx(s); 1350 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1351 expire_upcalls, NULL); 1352 } 1353 1354 /* 1355 * Packet forwarding routine once entry in the cache is made 1356 */ 1357 static int 1358 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1359 { 1360 INIT_VNET_INET6(curvnet); 1361 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1362 mifi_t mifi, iif; 1363 struct mif6 *mifp; 1364 int plen = m->m_pkthdr.len; 1365 struct in6_addr src0, dst0; /* copies for local work */ 1366 u_int32_t iszone, idzone, oszone, odzone; 1367 int error = 0; 1368 1369 /* 1370 * Macro to send packet on mif. Since RSVP packets don't get counted on 1371 * input, they shouldn't get counted on output, so statistics keeping is 1372 * separate. 1373 */ 1374 1375 #define MC6_SEND(ip6, mifp, m) do { \ 1376 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1377 register_send((ip6), (mifp), (m)); \ 1378 else \ 1379 phyint_send((ip6), (mifp), (m)); \ 1380 } while (/*CONSTCOND*/ 0) 1381 1382 /* 1383 * Don't forward if it didn't arrive from the parent mif 1384 * for its origin. 1385 */ 1386 mifi = rt->mf6c_parent; 1387 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1388 /* came in the wrong interface */ 1389 #ifdef MRT6DEBUG 1390 if (V_mrt6debug & DEBUG_FORWARD) 1391 log(LOG_DEBUG, 1392 "wrong if: ifid %d mifi %d mififid %x\n", 1393 ifp->if_index, mifi, 1394 mif6table[mifi].m6_ifp->if_index); 1395 #endif 1396 mrt6stat.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_HASCL(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.mrt6s_upcalls++; 1470 1471 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1472 #ifdef MRT6DEBUG 1473 if (V_mrt6debug) 1474 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1475 #endif 1476 ++mrt6stat.mrt6s_upq_sockfull; 1477 return (ENOBUFS); 1478 } /* if socket Q full */ 1479 } /* if PIM */ 1480 return (0); 1481 } /* if wrong iif */ 1482 1483 /* If I sourced this packet, it counts as output, else it was input. */ 1484 if (m->m_pkthdr.rcvif == NULL) { 1485 /* XXX: is rcvif really NULL when output?? */ 1486 mif6table[mifi].m6_pkt_out++; 1487 mif6table[mifi].m6_bytes_out += plen; 1488 } else { 1489 mif6table[mifi].m6_pkt_in++; 1490 mif6table[mifi].m6_bytes_in += plen; 1491 } 1492 rt->mf6c_pkt_cnt++; 1493 rt->mf6c_byte_cnt += plen; 1494 1495 /* 1496 * For each mif, forward a copy of the packet if there are group 1497 * members downstream on the interface. 1498 */ 1499 src0 = ip6->ip6_src; 1500 dst0 = ip6->ip6_dst; 1501 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1502 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1503 V_ip6stat.ip6s_badscope++; 1504 return (error); 1505 } 1506 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1507 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1508 /* 1509 * check if the outgoing packet is going to break 1510 * a scope boundary. 1511 * XXX For packets through PIM register tunnel 1512 * interface, we believe a routing daemon. 1513 */ 1514 if (!(mif6table[rt->mf6c_parent].m6_flags & 1515 MIFF_REGISTER) && 1516 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1517 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1518 &oszone) || 1519 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1520 &odzone) || 1521 iszone != oszone || 1522 idzone != odzone) { 1523 V_ip6stat.ip6s_badscope++; 1524 continue; 1525 } 1526 } 1527 1528 mifp->m6_pkt_out++; 1529 mifp->m6_bytes_out += plen; 1530 MC6_SEND(ip6, mifp, m); 1531 } 1532 } 1533 return (0); 1534 } 1535 1536 static void 1537 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1538 { 1539 INIT_VNET_INET6(curvnet); 1540 struct mbuf *mb_copy; 1541 struct ifnet *ifp = mifp->m6_ifp; 1542 int error = 0; 1543 int s = splnet(); /* needs to protect static "ro" below. */ 1544 static struct route_in6 ro; 1545 struct in6_multi *in6m; 1546 struct sockaddr_in6 *dst6; 1547 u_long linkmtu; 1548 1549 /* 1550 * Make a new reference to the packet; make sure that 1551 * the IPv6 header is actually copied, not just referenced, 1552 * so that ip6_output() only scribbles on the copy. 1553 */ 1554 mb_copy = m_copy(m, 0, M_COPYALL); 1555 if (mb_copy && 1556 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1557 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1558 if (mb_copy == NULL) { 1559 splx(s); 1560 return; 1561 } 1562 /* set MCAST flag to the outgoing packet */ 1563 mb_copy->m_flags |= M_MCAST; 1564 1565 /* 1566 * If we sourced the packet, call ip6_output since we may devide 1567 * the packet into fragments when the packet is too big for the 1568 * outgoing interface. 1569 * Otherwise, we can simply send the packet to the interface 1570 * sending queue. 1571 */ 1572 if (m->m_pkthdr.rcvif == NULL) { 1573 struct ip6_moptions im6o; 1574 1575 im6o.im6o_multicast_ifp = ifp; 1576 /* XXX: ip6_output will override ip6->ip6_hlim */ 1577 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1578 im6o.im6o_multicast_loop = 1; 1579 error = ip6_output(mb_copy, NULL, &ro, 1580 IPV6_FORWARDING, &im6o, NULL, NULL); 1581 1582 #ifdef MRT6DEBUG 1583 if (V_mrt6debug & DEBUG_XMIT) 1584 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1585 mifp - mif6table, error); 1586 #endif 1587 splx(s); 1588 return; 1589 } 1590 1591 /* 1592 * If we belong to the destination multicast group 1593 * on the outgoing interface, loop back a copy. 1594 */ 1595 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1596 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1597 if (in6m != NULL) { 1598 dst6->sin6_len = sizeof(struct sockaddr_in6); 1599 dst6->sin6_family = AF_INET6; 1600 dst6->sin6_addr = ip6->ip6_dst; 1601 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1602 } 1603 /* 1604 * Put the packet into the sending queue of the outgoing interface 1605 * if it would fit in the MTU of the interface. 1606 */ 1607 linkmtu = IN6_LINKMTU(ifp); 1608 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1609 dst6->sin6_len = sizeof(struct sockaddr_in6); 1610 dst6->sin6_family = AF_INET6; 1611 dst6->sin6_addr = ip6->ip6_dst; 1612 /* 1613 * We just call if_output instead of nd6_output here, since 1614 * we need no ND for a multicast forwarded packet...right? 1615 */ 1616 error = (*ifp->if_output)(ifp, mb_copy, 1617 (struct sockaddr *)&ro.ro_dst, NULL); 1618 #ifdef MRT6DEBUG 1619 if (V_mrt6debug & DEBUG_XMIT) 1620 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1621 mifp - mif6table, error); 1622 #endif 1623 } else { 1624 /* 1625 * pMTU discovery is intentionally disabled by default, since 1626 * various router may notify pMTU in multicast, which can be 1627 * a DDoS to a router 1628 */ 1629 if (V_ip6_mcast_pmtu) 1630 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1631 else { 1632 #ifdef MRT6DEBUG 1633 if (V_mrt6debug & DEBUG_XMIT) { 1634 char ip6bufs[INET6_ADDRSTRLEN]; 1635 char ip6bufd[INET6_ADDRSTRLEN]; 1636 log(LOG_DEBUG, 1637 "phyint_send: packet too big on %s o %s " 1638 "g %s size %d(discarded)\n", 1639 if_name(ifp), 1640 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1641 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1642 mb_copy->m_pkthdr.len); 1643 } 1644 #endif /* MRT6DEBUG */ 1645 m_freem(mb_copy); /* simply discard the packet */ 1646 } 1647 } 1648 1649 splx(s); 1650 } 1651 1652 static int 1653 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1654 { 1655 struct mbuf *mm; 1656 int i, len = m->m_pkthdr.len; 1657 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1658 struct mrt6msg *im6; 1659 1660 #ifdef MRT6DEBUG 1661 if (V_mrt6debug) { 1662 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1663 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1664 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1665 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1666 } 1667 #endif 1668 ++pim6stat.pim6s_snd_registers; 1669 1670 /* Make a copy of the packet to send to the user level process */ 1671 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1672 if (mm == NULL) 1673 return (ENOBUFS); 1674 mm->m_pkthdr.rcvif = NULL; 1675 mm->m_data += max_linkhdr; 1676 mm->m_len = sizeof(struct ip6_hdr); 1677 1678 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1679 m_freem(mm); 1680 return (ENOBUFS); 1681 } 1682 i = MHLEN - M_LEADINGSPACE(mm); 1683 if (i > len) 1684 i = len; 1685 mm = m_pullup(mm, i); 1686 if (mm == NULL) 1687 return (ENOBUFS); 1688 /* TODO: check it! */ 1689 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1690 1691 /* 1692 * Send message to routing daemon 1693 */ 1694 sin6.sin6_addr = ip6->ip6_src; 1695 1696 im6 = mtod(mm, struct mrt6msg *); 1697 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1698 im6->im6_mbz = 0; 1699 1700 im6->im6_mif = mif - mif6table; 1701 1702 /* iif info is not given for reg. encap.n */ 1703 mrt6stat.mrt6s_upcalls++; 1704 1705 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1706 #ifdef MRT6DEBUG 1707 if (V_mrt6debug) 1708 log(LOG_WARNING, 1709 "register_send: ip6_mrouter socket queue full\n"); 1710 #endif 1711 ++mrt6stat.mrt6s_upq_sockfull; 1712 return (ENOBUFS); 1713 } 1714 return (0); 1715 } 1716 1717 /* 1718 * PIM sparse mode hook 1719 * Receives the pim control messages, and passes them up to the listening 1720 * socket, using rip6_input. 1721 * The only message processed is the REGISTER pim message; the pim header 1722 * is stripped off, and the inner packet is passed to register_mforward. 1723 */ 1724 int 1725 pim6_input(struct mbuf **mp, int *offp, int proto) 1726 { 1727 INIT_VNET_INET6(curvnet); 1728 struct pim *pim; /* pointer to a pim struct */ 1729 struct ip6_hdr *ip6; 1730 int pimlen; 1731 struct mbuf *m = *mp; 1732 int minlen; 1733 int off = *offp; 1734 1735 ++pim6stat.pim6s_rcv_total; 1736 1737 ip6 = mtod(m, struct ip6_hdr *); 1738 pimlen = m->m_pkthdr.len - *offp; 1739 1740 /* 1741 * Validate lengths 1742 */ 1743 if (pimlen < PIM_MINLEN) { 1744 ++pim6stat.pim6s_rcv_tooshort; 1745 #ifdef MRT6DEBUG 1746 if (V_mrt6debug & DEBUG_PIM) 1747 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1748 #endif 1749 m_freem(m); 1750 return (IPPROTO_DONE); 1751 } 1752 1753 /* 1754 * if the packet is at least as big as a REGISTER, go ahead 1755 * and grab the PIM REGISTER header size, to avoid another 1756 * possible m_pullup() later. 1757 * 1758 * PIM_MINLEN == pimhdr + u_int32 == 8 1759 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1760 */ 1761 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1762 1763 /* 1764 * Make sure that the IP6 and PIM headers in contiguous memory, and 1765 * possibly the PIM REGISTER header 1766 */ 1767 #ifndef PULLDOWN_TEST 1768 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1769 /* adjust pointer */ 1770 ip6 = mtod(m, struct ip6_hdr *); 1771 1772 /* adjust mbuf to point to the PIM header */ 1773 pim = (struct pim *)((caddr_t)ip6 + off); 1774 #else 1775 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1776 if (pim == NULL) { 1777 pim6stat.pim6s_rcv_tooshort++; 1778 return (IPPROTO_DONE); 1779 } 1780 #endif 1781 1782 #define PIM6_CHECKSUM 1783 #ifdef PIM6_CHECKSUM 1784 { 1785 int cksumlen; 1786 1787 /* 1788 * Validate checksum. 1789 * If PIM REGISTER, exclude the data packet 1790 */ 1791 if (pim->pim_type == PIM_REGISTER) 1792 cksumlen = PIM_MINLEN; 1793 else 1794 cksumlen = pimlen; 1795 1796 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1797 ++pim6stat.pim6s_rcv_badsum; 1798 #ifdef MRT6DEBUG 1799 if (V_mrt6debug & DEBUG_PIM) 1800 log(LOG_DEBUG, 1801 "pim6_input: invalid checksum\n"); 1802 #endif 1803 m_freem(m); 1804 return (IPPROTO_DONE); 1805 } 1806 } 1807 #endif /* PIM_CHECKSUM */ 1808 1809 /* PIM version check */ 1810 if (pim->pim_ver != PIM_VERSION) { 1811 ++pim6stat.pim6s_rcv_badversion; 1812 #ifdef MRT6DEBUG 1813 log(LOG_ERR, 1814 "pim6_input: incorrect version %d, expecting %d\n", 1815 pim->pim_ver, PIM_VERSION); 1816 #endif 1817 m_freem(m); 1818 return (IPPROTO_DONE); 1819 } 1820 1821 if (pim->pim_type == PIM_REGISTER) { 1822 /* 1823 * since this is a REGISTER, we'll make a copy of the register 1824 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1825 * routing daemon. 1826 */ 1827 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1828 1829 struct mbuf *mcp; 1830 struct ip6_hdr *eip6; 1831 u_int32_t *reghdr; 1832 int rc; 1833 #ifdef MRT6DEBUG 1834 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1835 #endif 1836 1837 ++pim6stat.pim6s_rcv_registers; 1838 1839 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1840 #ifdef MRT6DEBUG 1841 if (V_mrt6debug & DEBUG_PIM) 1842 log(LOG_DEBUG, 1843 "pim6_input: register mif not set: %d\n", 1844 reg_mif_num); 1845 #endif 1846 m_freem(m); 1847 return (IPPROTO_DONE); 1848 } 1849 1850 reghdr = (u_int32_t *)(pim + 1); 1851 1852 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1853 goto pim6_input_to_daemon; 1854 1855 /* 1856 * Validate length 1857 */ 1858 if (pimlen < PIM6_REG_MINLEN) { 1859 ++pim6stat.pim6s_rcv_tooshort; 1860 ++pim6stat.pim6s_rcv_badregisters; 1861 #ifdef MRT6DEBUG 1862 log(LOG_ERR, 1863 "pim6_input: register packet size too " 1864 "small %d from %s\n", 1865 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1866 #endif 1867 m_freem(m); 1868 return (IPPROTO_DONE); 1869 } 1870 1871 eip6 = (struct ip6_hdr *) (reghdr + 1); 1872 #ifdef MRT6DEBUG 1873 if (V_mrt6debug & DEBUG_PIM) 1874 log(LOG_DEBUG, 1875 "pim6_input[register], eip6: %s -> %s, " 1876 "eip6 plen %d\n", 1877 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1878 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1879 ntohs(eip6->ip6_plen)); 1880 #endif 1881 1882 /* verify the version number of the inner packet */ 1883 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1884 ++pim6stat.pim6s_rcv_badregisters; 1885 #ifdef MRT6DEBUG 1886 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1887 "of the inner packet\n", 1888 (eip6->ip6_vfc & IPV6_VERSION)); 1889 #endif 1890 m_freem(m); 1891 return (IPPROTO_NONE); 1892 } 1893 1894 /* verify the inner packet is destined to a mcast group */ 1895 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1896 ++pim6stat.pim6s_rcv_badregisters; 1897 #ifdef MRT6DEBUG 1898 if (V_mrt6debug & DEBUG_PIM) 1899 log(LOG_DEBUG, 1900 "pim6_input: inner packet of register " 1901 "is not multicast %s\n", 1902 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1903 #endif 1904 m_freem(m); 1905 return (IPPROTO_DONE); 1906 } 1907 1908 /* 1909 * make a copy of the whole header to pass to the daemon later. 1910 */ 1911 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1912 if (mcp == NULL) { 1913 #ifdef MRT6DEBUG 1914 log(LOG_ERR, 1915 "pim6_input: pim register: " 1916 "could not copy register head\n"); 1917 #endif 1918 m_freem(m); 1919 return (IPPROTO_DONE); 1920 } 1921 1922 /* 1923 * forward the inner ip6 packet; point m_data at the inner ip6. 1924 */ 1925 m_adj(m, off + PIM_MINLEN); 1926 #ifdef MRT6DEBUG 1927 if (V_mrt6debug & DEBUG_PIM) { 1928 log(LOG_DEBUG, 1929 "pim6_input: forwarding decapsulated register: " 1930 "src %s, dst %s, mif %d\n", 1931 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1932 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1933 reg_mif_num); 1934 } 1935 #endif 1936 1937 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1938 dst.sin6_family, 0); 1939 1940 /* prepare the register head to send to the mrouting daemon */ 1941 m = mcp; 1942 } 1943 1944 /* 1945 * Pass the PIM message up to the daemon; if it is a register message 1946 * pass the 'head' only up to the daemon. This includes the 1947 * encapsulator ip6 header, pim header, register header and the 1948 * encapsulated ip6 header. 1949 */ 1950 pim6_input_to_daemon: 1951 rip6_input(&m, offp, proto); 1952 return (IPPROTO_DONE); 1953 } 1954