ip6_mroute.c revision 1.50
1 /* $NetBSD: ip6_mroute.c,v 1.50 2003/07/08 10:20:45 itojun Exp $ */ 2 /* $KAME: ip6_mroute.c,v 1.49 2001/07/25 09:21:18 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ 34 35 /* 36 * Copyright (c) 1989 Stephen Deering 37 * Copyright (c) 1992, 1993 38 * The Regents of the University of California. All rights reserved. 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Stephen Deering of Stanford University. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 72 */ 73 74 /* 75 * IP multicast forwarding procedures 76 * 77 * Written by David Waitzman, BBN Labs, August 1988. 78 * Modified by Steve Deering, Stanford, February 1989. 79 * Modified by Mark J. Steiglitz, Stanford, May, 1991 80 * Modified by Van Jacobson, LBL, January 1993 81 * Modified by Ajit Thyagarajan, PARC, August 1993 82 * Modified by Bill Fenner, PARC, April 1994 83 * 84 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 85 */ 86 87 #include <sys/cdefs.h> 88 __KERNEL_RCSID(0, "$NetBSD: ip6_mroute.c,v 1.50 2003/07/08 10:20:45 itojun Exp $"); 89 90 #include "opt_inet.h" 91 #include "opt_mrouting.h" 92 93 #ifndef _KERNEL 94 # ifdef KERNEL 95 # define _KERNEL 96 # endif 97 #endif 98 99 #include <sys/param.h> 100 #include <sys/systm.h> 101 #include <sys/callout.h> 102 #include <sys/mbuf.h> 103 #include <sys/socket.h> 104 #include <sys/socketvar.h> 105 #include <sys/sockio.h> 106 #include <sys/protosw.h> 107 #include <sys/errno.h> 108 #include <sys/time.h> 109 #include <sys/kernel.h> 110 #include <sys/ioctl.h> 111 #include <sys/syslog.h> 112 113 #include <net/if.h> 114 #include <net/route.h> 115 #include <net/raw_cb.h> 116 117 #include <netinet/in.h> 118 #include <netinet/in_var.h> 119 #ifdef MULTICAST_PMTUD 120 #include <netinet/icmp6.h> 121 #endif 122 123 #include <netinet/ip6.h> 124 #include <netinet6/ip6_var.h> 125 #include <netinet6/ip6_mroute.h> 126 #include <netinet6/pim6.h> 127 #include <netinet6/pim6_var.h> 128 #include <netinet6/nd6.h> 129 130 #include <net/net_osdep.h> 131 132 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 133 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 134 135 static int set_pim6 __P((int *)); 136 static int get_pim6 __P((struct mbuf *)); 137 static int socket_send __P((struct socket *, struct mbuf *, 138 struct sockaddr_in6 *)); 139 static int register_send __P((struct ip6_hdr *, struct mif6 *, 140 struct mbuf *)); 141 142 /* 143 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 144 * except for netstat or debugging purposes. 145 */ 146 struct socket *ip6_mrouter = NULL; 147 int ip6_mrouter_ver = 0; 148 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 149 struct mrt6stat mrt6stat; 150 151 #define NO_RTE_FOUND 0x1 152 #define RTE_FOUND 0x2 153 154 struct mf6c *mf6ctable[MF6CTBLSIZ]; 155 u_char n6expire[MF6CTBLSIZ]; 156 static struct mif6 mif6table[MAXMIFS]; 157 #ifdef MRT6DEBUG 158 u_int mrt6debug = 0; /* debug level */ 159 #define DEBUG_MFC 0x02 160 #define DEBUG_FORWARD 0x04 161 #define DEBUG_EXPIRE 0x08 162 #define DEBUG_XMIT 0x10 163 #define DEBUG_REG 0x20 164 #define DEBUG_PIM 0x40 165 #endif 166 167 static void expire_upcalls __P((void *)); 168 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 169 #define UPCALL_EXPIRE 6 /* number of timeouts */ 170 171 #ifdef INET 172 #ifdef MROUTING 173 extern struct socket *ip_mrouter; 174 #endif 175 #endif 176 177 /* 178 * 'Interfaces' associated with decapsulator (so we can tell 179 * packets that went through it from ones that get reflected 180 * by a broken gateway). These interfaces are never linked into 181 * the system ifnet list & no routes point to them. I.e., packets 182 * can't be sent this way. They only exist as a placeholder for 183 * multicast source verification. 184 */ 185 struct ifnet multicast_register_if; 186 187 #define ENCAP_HOPS 64 188 189 /* 190 * Private variables. 191 */ 192 static mifi_t nummifs = 0; 193 static mifi_t reg_mif_num = (mifi_t)-1; 194 195 static struct pim6stat pim6stat; 196 static int pim6; 197 198 /* 199 * Hash function for a source, group entry 200 */ 201 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 202 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 203 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 204 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 205 206 /* 207 * Find a route for a given origin IPv6 address and Multicast group address. 208 * Quality of service parameter to be added in the future!!! 209 */ 210 211 #define MF6CFIND(o, g, rt) do { \ 212 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 213 rt = NULL; \ 214 mrt6stat.mrt6s_mfc_lookups++; \ 215 while (_rt) { \ 216 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 217 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 218 (_rt->mf6c_stall == NULL)) { \ 219 rt = _rt; \ 220 break; \ 221 } \ 222 _rt = _rt->mf6c_next; \ 223 } \ 224 if (rt == NULL) { \ 225 mrt6stat.mrt6s_mfc_misses++; \ 226 } \ 227 } while (/*CONSTCOND*/ 0) 228 229 /* 230 * Macros to compute elapsed time efficiently 231 * Borrowed from Van Jacobson's scheduling code 232 */ 233 #define TV_DELTA(a, b, delta) do { \ 234 int xxs; \ 235 \ 236 delta = (a).tv_usec - (b).tv_usec; \ 237 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 238 switch (xxs) { \ 239 case 2: \ 240 delta += 1000000; \ 241 /* FALLTHROUGH */ \ 242 case 1: \ 243 delta += 1000000; \ 244 break; \ 245 default: \ 246 delta += (1000000 * xxs); \ 247 } \ 248 } \ 249 } while (/*CONSTCOND*/ 0) 250 251 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 252 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 253 254 #ifdef UPCALL_TIMING 255 #define UPCALL_MAX 50 256 u_long upcall_data[UPCALL_MAX + 1]; 257 static void collate(); 258 #endif /* UPCALL_TIMING */ 259 260 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 261 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 262 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 263 static int add_m6if __P((struct mif6ctl *)); 264 static int del_m6if __P((mifi_t *)); 265 static int add_m6fc __P((struct mf6cctl *)); 266 static int del_m6fc __P((struct mf6cctl *)); 267 268 static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER; 269 270 /* 271 * Handle MRT setsockopt commands to modify the multicast routing tables. 272 */ 273 int 274 ip6_mrouter_set(cmd, so, m) 275 int cmd; 276 struct socket *so; 277 struct mbuf *m; 278 { 279 if (cmd != MRT6_INIT && so != ip6_mrouter) 280 return EACCES; 281 282 switch (cmd) { 283 case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd); 284 case MRT6_INIT: return ip6_mrouter_init(so, m, cmd); 285 case MRT6_DONE: return ip6_mrouter_done(); 286 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 287 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 288 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 289 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 290 case MRT6_PIM: return set_pim6(mtod(m, int *)); 291 default: return EOPNOTSUPP; 292 } 293 } 294 295 /* 296 * Handle MRT getsockopt commands 297 */ 298 int 299 ip6_mrouter_get(cmd, so, m) 300 int cmd; 301 struct socket *so; 302 struct mbuf **m; 303 { 304 struct mbuf *mb; 305 306 if (so != ip6_mrouter) return EACCES; 307 308 *m = mb = m_get(M_WAIT, MT_SOOPTS); 309 310 switch (cmd) { 311 case MRT6_PIM: 312 return get_pim6(mb); 313 default: 314 m_free(mb); 315 return EOPNOTSUPP; 316 } 317 } 318 319 /* 320 * Handle ioctl commands to obtain information from the cache 321 */ 322 int 323 mrt6_ioctl(cmd, data) 324 int cmd; 325 caddr_t data; 326 { 327 328 switch (cmd) { 329 case SIOCGETSGCNT_IN6: 330 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 331 case SIOCGETMIFCNT_IN6: 332 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 333 default: 334 return (EINVAL); 335 } 336 } 337 338 /* 339 * returns the packet, byte, rpf-failure count for the source group provided 340 */ 341 static int 342 get_sg_cnt(req) 343 struct sioc_sg_req6 *req; 344 { 345 struct mf6c *rt; 346 int s; 347 348 s = splsoftnet(); 349 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 350 splx(s); 351 if (rt != NULL) { 352 req->pktcnt = rt->mf6c_pkt_cnt; 353 req->bytecnt = rt->mf6c_byte_cnt; 354 req->wrong_if = rt->mf6c_wrong_if; 355 } else 356 return (ESRCH); 357 #if 0 358 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 359 #endif 360 361 return 0; 362 } 363 364 /* 365 * returns the input and output packet and byte counts on the mif provided 366 */ 367 static int 368 get_mif6_cnt(req) 369 struct sioc_mif_req6 *req; 370 { 371 mifi_t mifi = req->mifi; 372 373 if (mifi >= nummifs) 374 return EINVAL; 375 376 req->icount = mif6table[mifi].m6_pkt_in; 377 req->ocount = mif6table[mifi].m6_pkt_out; 378 req->ibytes = mif6table[mifi].m6_bytes_in; 379 req->obytes = mif6table[mifi].m6_bytes_out; 380 381 return 0; 382 } 383 384 /* 385 * Get PIM processiong global 386 */ 387 static int 388 get_pim6(m) 389 struct mbuf *m; 390 { 391 int *i; 392 393 i = mtod(m, int *); 394 395 *i = pim6; 396 397 return 0; 398 } 399 400 static int 401 set_pim6(i) 402 int *i; 403 { 404 if ((*i != 1) && (*i != 0)) 405 return EINVAL; 406 407 pim6 = *i; 408 409 return 0; 410 } 411 412 /* 413 * Enable multicast routing 414 */ 415 static int 416 ip6_mrouter_init(so, m, cmd) 417 struct socket *so; 418 struct mbuf *m; 419 int cmd; 420 { 421 int *v; 422 423 #ifdef MRT6DEBUG 424 if (mrt6debug) 425 log(LOG_DEBUG, 426 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 427 so->so_type, so->so_proto->pr_protocol); 428 #endif 429 430 if (so->so_type != SOCK_RAW || 431 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 432 return EOPNOTSUPP; 433 434 if (!m || (m->m_len != sizeof(int *))) 435 return ENOPROTOOPT; 436 437 v = mtod(m, int *); 438 if (*v != 1) 439 return ENOPROTOOPT; 440 441 if (ip6_mrouter != NULL) return EADDRINUSE; 442 443 ip6_mrouter = so; 444 ip6_mrouter_ver = cmd; 445 446 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 447 bzero((caddr_t)n6expire, sizeof(n6expire)); 448 449 pim6 = 0;/* used for stubbing out/in pim stuff */ 450 451 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 452 expire_upcalls, NULL); 453 454 #ifdef MRT6DEBUG 455 if (mrt6debug) 456 log(LOG_DEBUG, "ip6_mrouter_init\n"); 457 #endif 458 459 return 0; 460 } 461 462 /* 463 * Disable multicast routing 464 */ 465 int 466 ip6_mrouter_done() 467 { 468 mifi_t mifi; 469 int i; 470 struct ifnet *ifp; 471 struct in6_ifreq ifr; 472 struct mf6c *rt; 473 struct rtdetq *rte; 474 int s; 475 476 s = splsoftnet(); 477 478 /* 479 * For each phyint in use, disable promiscuous reception of all IPv6 480 * multicasts. 481 */ 482 #ifdef INET 483 #ifdef MROUTING 484 /* 485 * If there is still IPv4 multicast routing daemon, 486 * we remain interfaces to receive all muliticasted packets. 487 * XXX: there may be an interface in which the IPv4 multicast 488 * daemon is not interested... 489 */ 490 if (!ip_mrouter) 491 #endif 492 #endif 493 { 494 for (mifi = 0; mifi < nummifs; mifi++) { 495 if (mif6table[mifi].m6_ifp && 496 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 497 ifr.ifr_addr.sin6_family = AF_INET6; 498 ifr.ifr_addr.sin6_addr= in6addr_any; 499 ifp = mif6table[mifi].m6_ifp; 500 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 501 (caddr_t)&ifr); 502 } 503 } 504 } 505 #ifdef notyet 506 bzero((caddr_t)qtable, sizeof(qtable)); 507 bzero((caddr_t)tbftable, sizeof(tbftable)); 508 #endif 509 bzero((caddr_t)mif6table, sizeof(mif6table)); 510 nummifs = 0; 511 512 pim6 = 0; /* used to stub out/in pim specific code */ 513 514 callout_stop(&expire_upcalls_ch); 515 516 /* 517 * Free all multicast forwarding cache entries. 518 */ 519 for (i = 0; i < MF6CTBLSIZ; i++) { 520 rt = mf6ctable[i]; 521 while (rt) { 522 struct mf6c *frt; 523 524 for (rte = rt->mf6c_stall; rte != NULL; ) { 525 struct rtdetq *n = rte->next; 526 527 m_free(rte->m); 528 free(rte, M_MRTABLE); 529 rte = n; 530 } 531 frt = rt; 532 rt = rt->mf6c_next; 533 free(frt, M_MRTABLE); 534 } 535 } 536 537 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 538 539 /* 540 * Reset de-encapsulation cache 541 */ 542 reg_mif_num = -1; 543 544 ip6_mrouter = NULL; 545 ip6_mrouter_ver = 0; 546 547 splx(s); 548 549 #ifdef MRT6DEBUG 550 if (mrt6debug) 551 log(LOG_DEBUG, "ip6_mrouter_done\n"); 552 #endif 553 554 return 0; 555 } 556 557 void 558 ip6_mrouter_detach(ifp) 559 struct ifnet *ifp; 560 { 561 struct rtdetq *rte; 562 struct mf6c *mfc; 563 mifi_t mifi; 564 int i; 565 566 /* 567 * Delete a mif which points to ifp. 568 */ 569 for (mifi = 0; mifi < nummifs; mifi++) 570 if (mif6table[mifi].m6_ifp == ifp) 571 del_m6if(&mifi); 572 573 /* 574 * Clear rte->ifp of cache entries received on ifp. 575 */ 576 for (i = 0; i < MF6CTBLSIZ; i++) { 577 if (n6expire[i] == 0) 578 continue; 579 580 for (mfc = mf6ctable[i]; mfc != NULL; mfc = mfc->mf6c_next) { 581 for (rte = mfc->mf6c_stall; rte != NULL; rte = rte->next) { 582 if (rte->ifp == ifp) 583 rte->ifp = NULL; 584 } 585 } 586 } 587 } 588 589 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 590 591 /* 592 * Add a mif to the mif table 593 */ 594 static int 595 add_m6if(mifcp) 596 struct mif6ctl *mifcp; 597 { 598 struct mif6 *mifp; 599 struct ifnet *ifp; 600 struct in6_ifreq ifr; 601 int error, s; 602 #ifdef notyet 603 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 604 #endif 605 606 if (mifcp->mif6c_mifi >= MAXMIFS) 607 return EINVAL; 608 mifp = mif6table + mifcp->mif6c_mifi; 609 if (mifp->m6_ifp) 610 return EADDRINUSE; /* XXX: is it appropriate? */ 611 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 612 return ENXIO; 613 /* 614 * XXX: some OSes can remove ifp and clear ifindex2ifnet[id] 615 * even for id between 0 and if_index. 616 */ 617 if ((ifp = ifindex2ifnet[mifcp->mif6c_pifi]) == NULL) 618 return ENXIO; 619 620 if (mifcp->mif6c_flags & MIFF_REGISTER) { 621 if (reg_mif_num == (mifi_t)-1) { 622 strlcpy(multicast_register_if.if_xname, 623 "register_mif", 624 sizeof(multicast_register_if.if_xname)); 625 multicast_register_if.if_flags |= IFF_LOOPBACK; 626 multicast_register_if.if_index = mifcp->mif6c_mifi; 627 reg_mif_num = mifcp->mif6c_mifi; 628 } 629 630 ifp = &multicast_register_if; 631 632 } /* if REGISTER */ 633 else { 634 /* Make sure the interface supports multicast */ 635 if ((ifp->if_flags & IFF_MULTICAST) == 0) 636 return EOPNOTSUPP; 637 638 s = splsoftnet(); 639 /* 640 * Enable promiscuous reception of all IPv6 multicasts 641 * from the interface. 642 */ 643 ifr.ifr_addr.sin6_family = AF_INET6; 644 ifr.ifr_addr.sin6_addr = in6addr_any; 645 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 646 splx(s); 647 if (error) 648 return error; 649 } 650 651 s = splsoftnet(); 652 mifp->m6_flags = mifcp->mif6c_flags; 653 mifp->m6_ifp = ifp; 654 #ifdef notyet 655 /* scaling up here allows division by 1024 in critical code */ 656 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 657 #endif 658 /* initialize per mif pkt counters */ 659 mifp->m6_pkt_in = 0; 660 mifp->m6_pkt_out = 0; 661 mifp->m6_bytes_in = 0; 662 mifp->m6_bytes_out = 0; 663 splx(s); 664 665 /* Adjust nummifs up if the mifi is higher than nummifs */ 666 if (nummifs <= mifcp->mif6c_mifi) 667 nummifs = mifcp->mif6c_mifi + 1; 668 669 #ifdef MRT6DEBUG 670 if (mrt6debug) 671 log(LOG_DEBUG, 672 "add_mif #%d, phyint %s%d\n", 673 mifcp->mif6c_mifi, 674 ifp->if_name, ifp->if_unit); 675 #endif 676 677 return 0; 678 } 679 680 /* 681 * Delete a mif from the mif table 682 */ 683 static int 684 del_m6if(mifip) 685 mifi_t *mifip; 686 { 687 struct mif6 *mifp = mif6table + *mifip; 688 mifi_t mifi; 689 struct ifnet *ifp; 690 struct in6_ifreq ifr; 691 int s; 692 693 if (*mifip >= nummifs) 694 return EINVAL; 695 if (mifp->m6_ifp == NULL) 696 return EINVAL; 697 698 s = splsoftnet(); 699 700 if (!(mifp->m6_flags & MIFF_REGISTER)) { 701 /* 702 * XXX: what if there is yet IPv4 multicast daemon 703 * using the interface? 704 */ 705 ifp = mifp->m6_ifp; 706 707 ifr.ifr_addr.sin6_family = AF_INET6; 708 ifr.ifr_addr.sin6_addr = in6addr_any; 709 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 710 } 711 712 #ifdef notyet 713 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 714 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 715 #endif 716 bzero((caddr_t)mifp, sizeof (*mifp)); 717 718 /* Adjust nummifs down */ 719 for (mifi = nummifs; mifi > 0; mifi--) 720 if (mif6table[mifi - 1].m6_ifp) 721 break; 722 nummifs = mifi; 723 724 splx(s); 725 726 #ifdef MRT6DEBUG 727 if (mrt6debug) 728 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 729 #endif 730 731 return 0; 732 } 733 734 /* 735 * Add an mfc entry 736 */ 737 static int 738 add_m6fc(mfccp) 739 struct mf6cctl *mfccp; 740 { 741 struct mf6c *rt; 742 u_long hash; 743 struct rtdetq *rte; 744 u_short nstl; 745 int s; 746 747 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 748 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 749 750 /* If an entry already exists, just update the fields */ 751 if (rt) { 752 #ifdef MRT6DEBUG 753 if (mrt6debug & DEBUG_MFC) 754 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 755 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 756 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 757 mfccp->mf6cc_parent); 758 #endif 759 760 s = splsoftnet(); 761 rt->mf6c_parent = mfccp->mf6cc_parent; 762 rt->mf6c_ifset = mfccp->mf6cc_ifset; 763 splx(s); 764 return 0; 765 } 766 767 /* 768 * Find the entry for which the upcall was made and update 769 */ 770 s = splsoftnet(); 771 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 772 mfccp->mf6cc_mcastgrp.sin6_addr); 773 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 774 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 775 &mfccp->mf6cc_origin.sin6_addr) && 776 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 777 &mfccp->mf6cc_mcastgrp.sin6_addr) && 778 (rt->mf6c_stall != NULL)) { 779 780 if (nstl++) 781 log(LOG_ERR, 782 "add_m6fc: %s o %s g %s p %x dbx %p\n", 783 "multiple kernel entries", 784 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 785 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 786 mfccp->mf6cc_parent, rt->mf6c_stall); 787 788 #ifdef MRT6DEBUG 789 if (mrt6debug & DEBUG_MFC) 790 log(LOG_DEBUG, 791 "add_m6fc o %s g %s p %x dbg %x\n", 792 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 793 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 794 mfccp->mf6cc_parent, rt->mf6c_stall); 795 #endif 796 797 rt->mf6c_origin = mfccp->mf6cc_origin; 798 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 799 rt->mf6c_parent = mfccp->mf6cc_parent; 800 rt->mf6c_ifset = mfccp->mf6cc_ifset; 801 /* initialize pkt counters per src-grp */ 802 rt->mf6c_pkt_cnt = 0; 803 rt->mf6c_byte_cnt = 0; 804 rt->mf6c_wrong_if = 0; 805 806 rt->mf6c_expire = 0; /* Don't clean this guy up */ 807 n6expire[hash]--; 808 809 /* free packets Qed at the end of this entry */ 810 for (rte = rt->mf6c_stall; rte != NULL; ) { 811 struct rtdetq *n = rte->next; 812 if (rte->ifp) { 813 ip6_mdq(rte->m, rte->ifp, rt); 814 } 815 m_freem(rte->m); 816 #ifdef UPCALL_TIMING 817 collate(&(rte->t)); 818 #endif /* UPCALL_TIMING */ 819 free(rte, M_MRTABLE); 820 rte = n; 821 } 822 rt->mf6c_stall = NULL; 823 } 824 } 825 826 /* 827 * It is possible that an entry is being inserted without an upcall 828 */ 829 if (nstl == 0) { 830 #ifdef MRT6DEBUG 831 if (mrt6debug & DEBUG_MFC) 832 log(LOG_DEBUG, 833 "add_mfc no upcall h %d o %s g %s p %x\n", 834 hash, 835 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 836 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 837 mfccp->mf6cc_parent); 838 #endif 839 840 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 841 842 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 843 &mfccp->mf6cc_origin.sin6_addr)&& 844 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 845 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 846 847 rt->mf6c_origin = mfccp->mf6cc_origin; 848 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 849 rt->mf6c_parent = mfccp->mf6cc_parent; 850 rt->mf6c_ifset = mfccp->mf6cc_ifset; 851 /* initialize pkt counters per src-grp */ 852 rt->mf6c_pkt_cnt = 0; 853 rt->mf6c_byte_cnt = 0; 854 rt->mf6c_wrong_if = 0; 855 856 if (rt->mf6c_expire) 857 n6expire[hash]--; 858 rt->mf6c_expire = 0; 859 } 860 } 861 if (rt == NULL) { 862 /* no upcall, so make a new entry */ 863 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 864 M_NOWAIT); 865 if (rt == NULL) { 866 splx(s); 867 return ENOBUFS; 868 } 869 870 /* insert new entry at head of hash chain */ 871 rt->mf6c_origin = mfccp->mf6cc_origin; 872 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 873 rt->mf6c_parent = mfccp->mf6cc_parent; 874 rt->mf6c_ifset = mfccp->mf6cc_ifset; 875 /* initialize pkt counters per src-grp */ 876 rt->mf6c_pkt_cnt = 0; 877 rt->mf6c_byte_cnt = 0; 878 rt->mf6c_wrong_if = 0; 879 rt->mf6c_expire = 0; 880 rt->mf6c_stall = NULL; 881 882 /* link into table */ 883 rt->mf6c_next = mf6ctable[hash]; 884 mf6ctable[hash] = rt; 885 } 886 } 887 splx(s); 888 return 0; 889 } 890 891 #ifdef UPCALL_TIMING 892 /* 893 * collect delay statistics on the upcalls 894 */ 895 static void 896 collate(t) 897 struct timeval *t; 898 { 899 u_long d; 900 struct timeval tp; 901 u_long delta; 902 903 GET_TIME(tp); 904 905 if (TV_LT(*t, tp)) 906 { 907 TV_DELTA(tp, *t, delta); 908 909 d = delta >> 10; 910 if (d > UPCALL_MAX) 911 d = UPCALL_MAX; 912 913 ++upcall_data[d]; 914 } 915 } 916 #endif /* UPCALL_TIMING */ 917 918 /* 919 * Delete an mfc entry 920 */ 921 static int 922 del_m6fc(mfccp) 923 struct mf6cctl *mfccp; 924 { 925 struct sockaddr_in6 origin; 926 struct sockaddr_in6 mcastgrp; 927 struct mf6c *rt; 928 struct mf6c **nptr; 929 u_long hash; 930 int s; 931 932 origin = mfccp->mf6cc_origin; 933 mcastgrp = mfccp->mf6cc_mcastgrp; 934 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 935 936 #ifdef MRT6DEBUG 937 if (mrt6debug & DEBUG_MFC) 938 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 939 ip6_sprintf(&origin.sin6_addr), 940 ip6_sprintf(&mcastgrp.sin6_addr)); 941 #endif 942 943 s = splsoftnet(); 944 945 nptr = &mf6ctable[hash]; 946 while ((rt = *nptr) != NULL) { 947 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 948 &rt->mf6c_origin.sin6_addr) && 949 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 950 &rt->mf6c_mcastgrp.sin6_addr) && 951 rt->mf6c_stall == NULL) 952 break; 953 954 nptr = &rt->mf6c_next; 955 } 956 if (rt == NULL) { 957 splx(s); 958 return EADDRNOTAVAIL; 959 } 960 961 *nptr = rt->mf6c_next; 962 free(rt, M_MRTABLE); 963 964 splx(s); 965 966 return 0; 967 } 968 969 static int 970 socket_send(s, mm, src) 971 struct socket *s; 972 struct mbuf *mm; 973 struct sockaddr_in6 *src; 974 { 975 if (s) { 976 if (sbappendaddr(&s->so_rcv, 977 (struct sockaddr *)src, 978 mm, (struct mbuf *)0) != 0) { 979 sorwakeup(s); 980 return 0; 981 } 982 } 983 m_freem(mm); 984 return -1; 985 } 986 987 /* 988 * IPv6 multicast forwarding function. This function assumes that the packet 989 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 990 * pointed to by "ifp", and the packet is to be relayed to other networks 991 * that have members of the packet's destination IPv6 multicast group. 992 * 993 * The packet is returned unscathed to the caller, unless it is 994 * erroneous, in which case a non-zero return value tells the caller to 995 * discard it. 996 */ 997 998 int 999 ip6_mforward(ip6, ifp, m) 1000 struct ip6_hdr *ip6; 1001 struct ifnet *ifp; 1002 struct mbuf *m; 1003 { 1004 struct mf6c *rt; 1005 struct mif6 *mifp; 1006 struct mbuf *mm; 1007 int s; 1008 mifi_t mifi; 1009 1010 #ifdef MRT6DEBUG 1011 if (mrt6debug & DEBUG_FORWARD) 1012 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1013 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 1014 ifp->if_index); 1015 #endif 1016 1017 /* 1018 * Don't forward a packet with Hop limit of zero or one, 1019 * or a packet destined to a local-only group. 1020 */ 1021 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 1022 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1023 return 0; 1024 ip6->ip6_hlim--; 1025 1026 /* 1027 * Source address check: do not forward packets with unspecified 1028 * source. It was discussed in July 2000, on ipngwg mailing list. 1029 * This is rather more serious than unicast cases, because some 1030 * MLD packets can be sent with the unspecified source address 1031 * (although such packets must normally set 1 to the hop limit field). 1032 */ 1033 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1034 ip6stat.ip6s_cantforward++; 1035 if (ip6_log_time + ip6_log_interval < time.tv_sec) { 1036 ip6_log_time = time.tv_sec; 1037 log(LOG_DEBUG, 1038 "cannot forward " 1039 "from %s to %s nxt %d received on %s\n", 1040 ip6_sprintf(&ip6->ip6_src), 1041 ip6_sprintf(&ip6->ip6_dst), 1042 ip6->ip6_nxt, 1043 m->m_pkthdr.rcvif ? 1044 if_name(m->m_pkthdr.rcvif) : "?"); 1045 } 1046 return 0; 1047 } 1048 1049 /* 1050 * Determine forwarding mifs from the forwarding cache table 1051 */ 1052 s = splsoftnet(); 1053 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1054 1055 /* Entry exists, so forward if necessary */ 1056 if (rt) { 1057 splx(s); 1058 return (ip6_mdq(m, ifp, rt)); 1059 } else { 1060 /* 1061 * If we don't have a route for packet's origin, 1062 * Make a copy of the packet & 1063 * send message to routing daemon 1064 */ 1065 1066 struct mbuf *mb0; 1067 struct rtdetq *rte; 1068 u_long hash; 1069 /* int i, npkts;*/ 1070 #ifdef UPCALL_TIMING 1071 struct timeval tp; 1072 1073 GET_TIME(tp); 1074 #endif /* UPCALL_TIMING */ 1075 1076 mrt6stat.mrt6s_no_route++; 1077 #ifdef MRT6DEBUG 1078 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1079 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1080 ip6_sprintf(&ip6->ip6_src), 1081 ip6_sprintf(&ip6->ip6_dst)); 1082 #endif 1083 1084 /* 1085 * Allocate mbufs early so that we don't do extra work if we 1086 * are just going to fail anyway. 1087 */ 1088 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1089 M_NOWAIT); 1090 if (rte == NULL) { 1091 splx(s); 1092 return ENOBUFS; 1093 } 1094 mb0 = m_copy(m, 0, M_COPYALL); 1095 /* 1096 * Pullup packet header if needed before storing it, 1097 * as other references may modify it in the meantime. 1098 */ 1099 if (mb0 && 1100 (M_READONLY(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1101 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1102 if (mb0 == NULL) { 1103 free(rte, M_MRTABLE); 1104 splx(s); 1105 return ENOBUFS; 1106 } 1107 1108 /* is there an upcall waiting for this packet? */ 1109 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1110 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1111 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1112 &rt->mf6c_origin.sin6_addr) && 1113 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1114 &rt->mf6c_mcastgrp.sin6_addr) && 1115 (rt->mf6c_stall != NULL)) 1116 break; 1117 } 1118 1119 if (rt == NULL) { 1120 struct mrt6msg *im; 1121 struct omrt6msg *oim; 1122 1123 /* no upcall, so make a new entry */ 1124 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1125 M_NOWAIT); 1126 if (rt == NULL) { 1127 free(rte, M_MRTABLE); 1128 m_freem(mb0); 1129 splx(s); 1130 return ENOBUFS; 1131 } 1132 /* 1133 * Make a copy of the header to send to the user 1134 * level process 1135 */ 1136 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1137 1138 if (mm == NULL) { 1139 free(rte, M_MRTABLE); 1140 m_freem(mb0); 1141 free(rt, M_MRTABLE); 1142 splx(s); 1143 return ENOBUFS; 1144 } 1145 1146 /* 1147 * Send message to routing daemon 1148 */ 1149 sin6.sin6_addr = ip6->ip6_src; 1150 1151 im = NULL; 1152 oim = NULL; 1153 switch (ip6_mrouter_ver) { 1154 case MRT6_OINIT: 1155 oim = mtod(mm, struct omrt6msg *); 1156 oim->im6_msgtype = MRT6MSG_NOCACHE; 1157 oim->im6_mbz = 0; 1158 break; 1159 case MRT6_INIT: 1160 im = mtod(mm, struct mrt6msg *); 1161 im->im6_msgtype = MRT6MSG_NOCACHE; 1162 im->im6_mbz = 0; 1163 break; 1164 default: 1165 free(rte, M_MRTABLE); 1166 m_freem(mb0); 1167 free(rt, M_MRTABLE); 1168 splx(s); 1169 return EINVAL; 1170 } 1171 1172 #ifdef MRT6DEBUG 1173 if (mrt6debug & DEBUG_FORWARD) 1174 log(LOG_DEBUG, 1175 "getting the iif info in the kernel\n"); 1176 #endif 1177 1178 for (mifp = mif6table, mifi = 0; 1179 mifi < nummifs && mifp->m6_ifp != ifp; 1180 mifp++, mifi++) 1181 ; 1182 1183 switch (ip6_mrouter_ver) { 1184 case MRT6_OINIT: 1185 oim->im6_mif = mifi; 1186 break; 1187 case MRT6_INIT: 1188 im->im6_mif = mifi; 1189 break; 1190 } 1191 1192 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1193 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1194 "socket queue full\n"); 1195 mrt6stat.mrt6s_upq_sockfull++; 1196 free(rte, M_MRTABLE); 1197 m_freem(mb0); 1198 free(rt, M_MRTABLE); 1199 splx(s); 1200 return ENOBUFS; 1201 } 1202 1203 mrt6stat.mrt6s_upcalls++; 1204 1205 /* insert new entry at head of hash chain */ 1206 bzero(rt, sizeof(*rt)); 1207 rt->mf6c_origin.sin6_family = AF_INET6; 1208 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1209 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1210 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1211 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1212 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1213 rt->mf6c_expire = UPCALL_EXPIRE; 1214 n6expire[hash]++; 1215 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1216 1217 /* link into table */ 1218 rt->mf6c_next = mf6ctable[hash]; 1219 mf6ctable[hash] = rt; 1220 /* Add this entry to the end of the queue */ 1221 rt->mf6c_stall = rte; 1222 } else { 1223 /* determine if q has overflowed */ 1224 struct rtdetq **p; 1225 int npkts = 0; 1226 1227 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1228 if (++npkts > MAX_UPQ6) { 1229 mrt6stat.mrt6s_upq_ovflw++; 1230 free(rte, M_MRTABLE); 1231 m_freem(mb0); 1232 splx(s); 1233 return 0; 1234 } 1235 1236 /* Add this entry to the end of the queue */ 1237 *p = rte; 1238 } 1239 1240 rte->next = NULL; 1241 rte->m = mb0; 1242 rte->ifp = ifp; 1243 #ifdef UPCALL_TIMING 1244 rte->t = tp; 1245 #endif /* UPCALL_TIMING */ 1246 1247 splx(s); 1248 1249 return 0; 1250 } 1251 } 1252 1253 /* 1254 * Clean up cache entries if upcalls are not serviced 1255 * Call from the Slow Timeout mechanism, every half second. 1256 */ 1257 static void 1258 expire_upcalls(unused) 1259 void *unused; 1260 { 1261 struct rtdetq *rte; 1262 struct mf6c *mfc, **nptr; 1263 int i; 1264 int s; 1265 1266 s = splsoftnet(); 1267 for (i = 0; i < MF6CTBLSIZ; i++) { 1268 if (n6expire[i] == 0) 1269 continue; 1270 nptr = &mf6ctable[i]; 1271 while ((mfc = *nptr) != NULL) { 1272 rte = mfc->mf6c_stall; 1273 /* 1274 * Skip real cache entries 1275 * Make sure it wasn't marked to not expire (shouldn't happen) 1276 * If it expires now 1277 */ 1278 if (rte != NULL && 1279 mfc->mf6c_expire != 0 && 1280 --mfc->mf6c_expire == 0) { 1281 #ifdef MRT6DEBUG 1282 if (mrt6debug & DEBUG_EXPIRE) 1283 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1284 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1285 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1286 #endif 1287 /* 1288 * drop all the packets 1289 * free the mbuf with the pkt, if, timing info 1290 */ 1291 do { 1292 struct rtdetq *n = rte->next; 1293 m_freem(rte->m); 1294 free(rte, M_MRTABLE); 1295 rte = n; 1296 } while (rte != NULL); 1297 mrt6stat.mrt6s_cache_cleanups++; 1298 n6expire[i]--; 1299 1300 *nptr = mfc->mf6c_next; 1301 free(mfc, M_MRTABLE); 1302 } else { 1303 nptr = &mfc->mf6c_next; 1304 } 1305 } 1306 } 1307 splx(s); 1308 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1309 expire_upcalls, NULL); 1310 } 1311 1312 /* 1313 * Packet forwarding routine once entry in the cache is made 1314 */ 1315 static int 1316 ip6_mdq(m, ifp, rt) 1317 struct mbuf *m; 1318 struct ifnet *ifp; 1319 struct mf6c *rt; 1320 { 1321 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1322 mifi_t mifi, iif; 1323 struct mif6 *mifp; 1324 int plen = m->m_pkthdr.len; 1325 1326 /* 1327 * Macro to send packet on mif. Since RSVP packets don't get counted on 1328 * input, they shouldn't get counted on output, so statistics keeping is 1329 * separate. 1330 */ 1331 1332 #define MC6_SEND(ip6, mifp, m) do { \ 1333 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1334 register_send((ip6), (mifp), (m)); \ 1335 else \ 1336 phyint_send((ip6), (mifp), (m)); \ 1337 } while (/*CONSTCOND*/ 0) 1338 1339 /* 1340 * Don't forward if it didn't arrive from the parent mif 1341 * for its origin. 1342 */ 1343 mifi = rt->mf6c_parent; 1344 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1345 /* came in the wrong interface */ 1346 #ifdef MRT6DEBUG 1347 if (mrt6debug & DEBUG_FORWARD) 1348 log(LOG_DEBUG, 1349 "wrong if: ifid %d mifi %d mififid %x\n", 1350 ifp->if_index, mifi, 1351 mif6table[mifi].m6_ifp ? 1352 mif6table[mifi].m6_ifp->if_index : -1); 1353 #endif 1354 mrt6stat.mrt6s_wrong_if++; 1355 rt->mf6c_wrong_if++; 1356 /* 1357 * If we are doing PIM processing, and we are forwarding 1358 * packets on this interface, send a message to the 1359 * routing daemon. 1360 */ 1361 /* have to make sure this is a valid mif */ 1362 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1363 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1364 /* 1365 * Check the M_LOOP flag to avoid an 1366 * unnecessary PIM assert. 1367 * XXX: M_LOOP is an ad-hoc hack... 1368 */ 1369 static struct sockaddr_in6 sin6 = 1370 { sizeof(sin6), AF_INET6 }; 1371 1372 struct mbuf *mm; 1373 struct mrt6msg *im; 1374 struct omrt6msg *oim; 1375 1376 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1377 if (mm && 1378 (M_READONLY(mm) || 1379 mm->m_len < sizeof(struct ip6_hdr))) 1380 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1381 if (mm == NULL) 1382 return ENOBUFS; 1383 1384 oim = NULL; 1385 im = NULL; 1386 switch (ip6_mrouter_ver) { 1387 case MRT6_OINIT: 1388 oim = mtod(mm, struct omrt6msg *); 1389 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1390 oim->im6_mbz = 0; 1391 break; 1392 case MRT6_INIT: 1393 im = mtod(mm, struct mrt6msg *); 1394 im->im6_msgtype = MRT6MSG_WRONGMIF; 1395 im->im6_mbz = 0; 1396 break; 1397 default: 1398 m_freem(mm); 1399 return EINVAL; 1400 } 1401 1402 for (mifp = mif6table, iif = 0; 1403 iif < nummifs && mifp && 1404 mifp->m6_ifp != ifp; 1405 mifp++, iif++) 1406 ; 1407 1408 switch (ip6_mrouter_ver) { 1409 case MRT6_OINIT: 1410 oim->im6_mif = iif; 1411 sin6.sin6_addr = oim->im6_src; 1412 break; 1413 case MRT6_INIT: 1414 im->im6_mif = iif; 1415 sin6.sin6_addr = im->im6_src; 1416 break; 1417 } 1418 1419 mrt6stat.mrt6s_upcalls++; 1420 1421 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1422 #ifdef MRT6DEBUG 1423 if (mrt6debug) 1424 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1425 #endif 1426 ++mrt6stat.mrt6s_upq_sockfull; 1427 return ENOBUFS; 1428 } /* if socket Q full */ 1429 } /* if PIM */ 1430 return 0; 1431 } /* if wrong iif */ 1432 1433 /* If I sourced this packet, it counts as output, else it was input. */ 1434 if (m->m_pkthdr.rcvif == NULL) { 1435 /* XXX: is rcvif really NULL when output?? */ 1436 mif6table[mifi].m6_pkt_out++; 1437 mif6table[mifi].m6_bytes_out += plen; 1438 } else { 1439 mif6table[mifi].m6_pkt_in++; 1440 mif6table[mifi].m6_bytes_in += plen; 1441 } 1442 rt->mf6c_pkt_cnt++; 1443 rt->mf6c_byte_cnt += plen; 1444 1445 /* 1446 * For each mif, forward a copy of the packet if there are group 1447 * members downstream on the interface. 1448 */ 1449 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1450 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1451 if (mif6table[mifi].m6_ifp == NULL) 1452 continue; 1453 #ifdef notyet 1454 /* 1455 * check if the outgoing packet is going to break 1456 * a scope boundary. 1457 * XXX For packets through PIM register tunnel 1458 * interface, we believe a routing daemon. 1459 */ 1460 if ((mif6table[rt->mf6c_parent].m6_flags & 1461 MIFF_REGISTER) == 0 && 1462 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1463 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1464 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1465 &ip6->ip6_dst) || 1466 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1467 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1468 &ip6->ip6_src))) { 1469 ip6stat.ip6s_badscope++; 1470 continue; 1471 } 1472 #endif 1473 1474 mifp->m6_pkt_out++; 1475 mifp->m6_bytes_out += plen; 1476 MC6_SEND(ip6, mifp, m); 1477 } 1478 return 0; 1479 } 1480 1481 static void 1482 phyint_send(ip6, mifp, m) 1483 struct ip6_hdr *ip6; 1484 struct mif6 *mifp; 1485 struct mbuf *m; 1486 { 1487 struct mbuf *mb_copy; 1488 struct ifnet *ifp = mifp->m6_ifp; 1489 int error = 0; 1490 int s = splsoftnet(); 1491 static struct route_in6 ro; 1492 struct in6_multi *in6m; 1493 struct sockaddr_in6 *dst6; 1494 u_long linkmtu; 1495 1496 /* 1497 * Make a new reference to the packet; make sure that 1498 * the IPv6 header is actually copied, not just referenced, 1499 * so that ip6_output() only scribbles on the copy. 1500 */ 1501 mb_copy = m_copy(m, 0, M_COPYALL); 1502 if (mb_copy && 1503 (M_READONLY(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1504 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1505 if (mb_copy == NULL) { 1506 splx(s); 1507 return; 1508 } 1509 /* set MCAST flag to the outgoing packet */ 1510 mb_copy->m_flags |= M_MCAST; 1511 1512 /* 1513 * If we sourced the packet, call ip6_output since we may devide 1514 * the packet into fragments when the packet is too big for the 1515 * outgoing interface. 1516 * Otherwise, we can simply send the packet to the interface 1517 * sending queue. 1518 */ 1519 if (m->m_pkthdr.rcvif == NULL) { 1520 struct ip6_moptions im6o; 1521 1522 im6o.im6o_multicast_ifp = ifp; 1523 /* XXX: ip6_output will override ip6->ip6_hlim */ 1524 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1525 im6o.im6o_multicast_loop = 1; 1526 error = ip6_output(mb_copy, NULL, &ro, 1527 IPV6_FORWARDING, &im6o, NULL); 1528 1529 #ifdef MRT6DEBUG 1530 if (mrt6debug & DEBUG_XMIT) 1531 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1532 mifp - mif6table, error); 1533 #endif 1534 splx(s); 1535 return; 1536 } 1537 1538 /* 1539 * If we belong to the destination multicast group 1540 * on the outgoing interface, loop back a copy. 1541 */ 1542 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1543 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1544 if (in6m != NULL) { 1545 dst6->sin6_len = sizeof(struct sockaddr_in6); 1546 dst6->sin6_family = AF_INET6; 1547 dst6->sin6_addr = ip6->ip6_dst; 1548 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1549 } 1550 /* 1551 * Put the packet into the sending queue of the outgoing interface 1552 * if it would fit in the MTU of the interface. 1553 */ 1554 linkmtu = IN6_LINKMTU(ifp); 1555 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1556 dst6->sin6_len = sizeof(struct sockaddr_in6); 1557 dst6->sin6_family = AF_INET6; 1558 dst6->sin6_addr = ip6->ip6_dst; 1559 /* 1560 * We just call if_output instead of nd6_output here, since 1561 * we need no ND for a multicast forwarded packet...right? 1562 */ 1563 error = (*ifp->if_output)(ifp, mb_copy, 1564 (struct sockaddr *)&ro.ro_dst, NULL); 1565 #ifdef MRT6DEBUG 1566 if (mrt6debug & DEBUG_XMIT) 1567 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1568 mifp - mif6table, error); 1569 #endif 1570 } else { 1571 #ifdef MULTICAST_PMTUD 1572 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1573 #else 1574 #ifdef MRT6DEBUG 1575 if (mrt6debug & DEBUG_XMIT) 1576 log(LOG_DEBUG, 1577 "phyint_send: packet too big on %s o %s g %s" 1578 " size %d(discarded)\n", 1579 if_name(ifp), 1580 ip6_sprintf(&ip6->ip6_src), 1581 ip6_sprintf(&ip6->ip6_dst), 1582 mb_copy->m_pkthdr.len); 1583 #endif /* MRT6DEBUG */ 1584 m_freem(mb_copy); /* simply discard the packet */ 1585 #endif 1586 } 1587 1588 splx(s); 1589 } 1590 1591 static int 1592 register_send(ip6, mif, m) 1593 struct ip6_hdr *ip6; 1594 struct mif6 *mif; 1595 struct mbuf *m; 1596 { 1597 struct mbuf *mm; 1598 int i, len = m->m_pkthdr.len; 1599 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1600 struct mrt6msg *im6; 1601 1602 #ifdef MRT6DEBUG 1603 if (mrt6debug) 1604 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1605 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1606 #endif 1607 ++pim6stat.pim6s_snd_registers; 1608 1609 /* Make a copy of the packet to send to the user level process */ 1610 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1611 if (mm == NULL) 1612 return ENOBUFS; 1613 mm->m_data += max_linkhdr; 1614 mm->m_len = sizeof(struct ip6_hdr); 1615 1616 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1617 m_freem(mm); 1618 return ENOBUFS; 1619 } 1620 i = MHLEN - M_LEADINGSPACE(mm); 1621 if (i > len) 1622 i = len; 1623 mm = m_pullup(mm, i); 1624 if (mm == NULL) 1625 return ENOBUFS; 1626 /* TODO: check it! */ 1627 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1628 1629 /* 1630 * Send message to routing daemon 1631 */ 1632 sin6.sin6_addr = ip6->ip6_src; 1633 1634 im6 = mtod(mm, struct mrt6msg *); 1635 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1636 im6->im6_mbz = 0; 1637 1638 im6->im6_mif = mif - mif6table; 1639 1640 /* iif info is not given for reg. encap.n */ 1641 mrt6stat.mrt6s_upcalls++; 1642 1643 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1644 #ifdef MRT6DEBUG 1645 if (mrt6debug) 1646 log(LOG_WARNING, 1647 "register_send: ip6_mrouter socket queue full\n"); 1648 #endif 1649 ++mrt6stat.mrt6s_upq_sockfull; 1650 return ENOBUFS; 1651 } 1652 return 0; 1653 } 1654 1655 /* 1656 * PIM sparse mode hook 1657 * Receives the pim control messages, and passes them up to the listening 1658 * socket, using rip6_input. 1659 * The only message processed is the REGISTER pim message; the pim header 1660 * is stripped off, and the inner packet is passed to register_mforward. 1661 */ 1662 int 1663 pim6_input(mp, offp, proto) 1664 struct mbuf **mp; 1665 int *offp, proto; 1666 { 1667 struct pim *pim; /* pointer to a pim struct */ 1668 struct ip6_hdr *ip6; 1669 int pimlen; 1670 struct mbuf *m = *mp; 1671 int minlen; 1672 int off = *offp; 1673 1674 ++pim6stat.pim6s_rcv_total; 1675 1676 ip6 = mtod(m, struct ip6_hdr *); 1677 pimlen = m->m_pkthdr.len - *offp; 1678 1679 /* 1680 * Validate lengths 1681 */ 1682 if (pimlen < PIM_MINLEN) { 1683 ++pim6stat.pim6s_rcv_tooshort; 1684 #ifdef MRT6DEBUG 1685 if (mrt6debug & DEBUG_PIM) 1686 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1687 #endif 1688 m_freem(m); 1689 return (IPPROTO_DONE); 1690 } 1691 1692 /* 1693 * if the packet is at least as big as a REGISTER, go ahead 1694 * and grab the PIM REGISTER header size, to avoid another 1695 * possible m_pullup() later. 1696 * 1697 * PIM_MINLEN == pimhdr + u_int32 == 8 1698 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1699 */ 1700 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1701 1702 /* 1703 * Make sure that the IP6 and PIM headers in contiguous memory, and 1704 * possibly the PIM REGISTER header 1705 */ 1706 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1707 if (pim == NULL) { 1708 pim6stat.pim6s_rcv_tooshort++; 1709 return IPPROTO_DONE; 1710 } 1711 1712 /* PIM version check */ 1713 if (pim->pim_ver != PIM_VERSION) { 1714 ++pim6stat.pim6s_rcv_badversion; 1715 #ifdef MRT6DEBUG 1716 log(LOG_ERR, 1717 "pim6_input: incorrect version %d, expecting %d\n", 1718 pim->pim_ver, PIM_VERSION); 1719 #endif 1720 m_freem(m); 1721 return (IPPROTO_DONE); 1722 } 1723 1724 #define PIM6_CHECKSUM 1725 #ifdef PIM6_CHECKSUM 1726 { 1727 int cksumlen; 1728 1729 /* 1730 * Validate checksum. 1731 * If PIM REGISTER, exclude the data packet 1732 */ 1733 if (pim->pim_type == PIM_REGISTER) 1734 cksumlen = PIM_MINLEN; 1735 else 1736 cksumlen = pimlen; 1737 1738 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1739 ++pim6stat.pim6s_rcv_badsum; 1740 #ifdef MRT6DEBUG 1741 if (mrt6debug & DEBUG_PIM) 1742 log(LOG_DEBUG, 1743 "pim6_input: invalid checksum\n"); 1744 #endif 1745 m_freem(m); 1746 return (IPPROTO_DONE); 1747 } 1748 } 1749 #endif /* PIM_CHECKSUM */ 1750 1751 if (pim->pim_type == PIM_REGISTER) { 1752 /* 1753 * since this is a REGISTER, we'll make a copy of the register 1754 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1755 * routing daemon. 1756 */ 1757 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1758 1759 struct mbuf *mcp; 1760 struct ip6_hdr *eip6; 1761 u_int32_t *reghdr; 1762 int rc; 1763 1764 ++pim6stat.pim6s_rcv_registers; 1765 1766 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1767 #ifdef MRT6DEBUG 1768 if (mrt6debug & DEBUG_PIM) 1769 log(LOG_DEBUG, 1770 "pim6_input: register mif not set: %d\n", 1771 reg_mif_num); 1772 #endif 1773 m_freem(m); 1774 return (IPPROTO_DONE); 1775 } 1776 1777 reghdr = (u_int32_t *)(pim + 1); 1778 1779 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1780 goto pim6_input_to_daemon; 1781 1782 /* 1783 * Validate length 1784 */ 1785 if (pimlen < PIM6_REG_MINLEN) { 1786 ++pim6stat.pim6s_rcv_tooshort; 1787 ++pim6stat.pim6s_rcv_badregisters; 1788 #ifdef MRT6DEBUG 1789 log(LOG_ERR, 1790 "pim6_input: register packet size too " 1791 "small %d from %s\n", 1792 pimlen, ip6_sprintf(&ip6->ip6_src)); 1793 #endif 1794 m_freem(m); 1795 return (IPPROTO_DONE); 1796 } 1797 1798 eip6 = (struct ip6_hdr *) (reghdr + 1); 1799 #ifdef MRT6DEBUG 1800 if (mrt6debug & DEBUG_PIM) 1801 log(LOG_DEBUG, 1802 "pim6_input[register], eip6: %s -> %s, " 1803 "eip6 plen %d\n", 1804 ip6_sprintf(&eip6->ip6_src), 1805 ip6_sprintf(&eip6->ip6_dst), 1806 ntohs(eip6->ip6_plen)); 1807 #endif 1808 1809 /* verify the version number of the inner packet */ 1810 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1811 ++pim6stat.pim6s_rcv_badregisters; 1812 #ifdef MRT6DEBUG 1813 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1814 "of the inner packet\n", 1815 (eip6->ip6_vfc & IPV6_VERSION)); 1816 #endif 1817 m_freem(m); 1818 return (IPPROTO_NONE); 1819 } 1820 1821 /* verify the inner packet is destined to a mcast group */ 1822 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1823 ++pim6stat.pim6s_rcv_badregisters; 1824 #ifdef MRT6DEBUG 1825 if (mrt6debug & DEBUG_PIM) 1826 log(LOG_DEBUG, 1827 "pim6_input: inner packet of register " 1828 "is not multicast %s\n", 1829 ip6_sprintf(&eip6->ip6_dst)); 1830 #endif 1831 m_freem(m); 1832 return (IPPROTO_DONE); 1833 } 1834 1835 /* 1836 * make a copy of the whole header to pass to the daemon later. 1837 */ 1838 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1839 if (mcp == NULL) { 1840 #ifdef MRT6DEBUG 1841 log(LOG_ERR, 1842 "pim6_input: pim register: " 1843 "could not copy register head\n"); 1844 #endif 1845 m_freem(m); 1846 return (IPPROTO_DONE); 1847 } 1848 1849 /* 1850 * forward the inner ip6 packet; point m_data at the inner ip6. 1851 */ 1852 m_adj(m, off + PIM_MINLEN); 1853 #ifdef MRT6DEBUG 1854 if (mrt6debug & DEBUG_PIM) { 1855 log(LOG_DEBUG, 1856 "pim6_input: forwarding decapsulated register: " 1857 "src %s, dst %s, mif %d\n", 1858 ip6_sprintf(&eip6->ip6_src), 1859 ip6_sprintf(&eip6->ip6_dst), 1860 reg_mif_num); 1861 } 1862 #endif 1863 1864 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1865 (struct sockaddr *) &dst, 1866 (struct rtentry *) NULL); 1867 1868 /* prepare the register head to send to the mrouting daemon */ 1869 m = mcp; 1870 } 1871 1872 /* 1873 * Pass the PIM message up to the daemon; if it is a register message 1874 * pass the 'head' only up to the daemon. This includes the 1875 * encapsulator ip6 header, pim header, register header and the 1876 * encapsulated ip6 header. 1877 */ 1878 pim6_input_to_daemon: 1879 rip6_input(&m, offp, proto); 1880 return (IPPROTO_DONE); 1881 } 1882
Indexes created Fri Sep 26 20:09:58 GMT 2025