ip6_mroute.c revision 1.52
1 /* $NetBSD: ip6_mroute.c,v 1.52 2003/07/12 15:16:50 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 1.52 2003/07/12 15:16:50 itojun Exp $"); 89 90 #include "opt_inet.h" 91 #include "opt_mrouting.h" 92 93 #include <sys/param.h> 94 #include <sys/systm.h> 95 #include <sys/callout.h> 96 #include <sys/mbuf.h> 97 #include <sys/socket.h> 98 #include <sys/socketvar.h> 99 #include <sys/sockio.h> 100 #include <sys/protosw.h> 101 #include <sys/errno.h> 102 #include <sys/time.h> 103 #include <sys/kernel.h> 104 #include <sys/ioctl.h> 105 #include <sys/syslog.h> 106 107 #include <net/if.h> 108 #include <net/route.h> 109 #include <net/raw_cb.h> 110 111 #include <netinet/in.h> 112 #include <netinet/in_var.h> 113 #ifdef MULTICAST_PMTUD 114 #include <netinet/icmp6.h> 115 #endif 116 117 #include <netinet/ip6.h> 118 #include <netinet6/ip6_var.h> 119 #include <netinet6/ip6_mroute.h> 120 #include <netinet6/pim6.h> 121 #include <netinet6/pim6_var.h> 122 #include <netinet6/nd6.h> 123 124 #include <net/net_osdep.h> 125 126 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 127 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 128 129 static int set_pim6 __P((int *)); 130 static int get_pim6 __P((struct mbuf *)); 131 static int socket_send __P((struct socket *, struct mbuf *, 132 struct sockaddr_in6 *)); 133 static int register_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 134 135 /* 136 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 137 * except for netstat or debugging purposes. 138 */ 139 struct socket *ip6_mrouter = NULL; 140 int ip6_mrouter_ver = 0; 141 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 142 struct mrt6stat mrt6stat; 143 144 #define NO_RTE_FOUND 0x1 145 #define RTE_FOUND 0x2 146 147 struct mf6c *mf6ctable[MF6CTBLSIZ]; 148 u_char n6expire[MF6CTBLSIZ]; 149 static struct mif6 mif6table[MAXMIFS]; 150 #ifdef MRT6DEBUG 151 u_int mrt6debug = 0; /* debug level */ 152 #define DEBUG_MFC 0x02 153 #define DEBUG_FORWARD 0x04 154 #define DEBUG_EXPIRE 0x08 155 #define DEBUG_XMIT 0x10 156 #define DEBUG_REG 0x20 157 #define DEBUG_PIM 0x40 158 #endif 159 160 static void expire_upcalls __P((void *)); 161 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 162 #define UPCALL_EXPIRE 6 /* number of timeouts */ 163 164 #ifdef INET 165 #ifdef MROUTING 166 extern struct socket *ip_mrouter; 167 #endif 168 #endif 169 170 /* 171 * 'Interfaces' associated with decapsulator (so we can tell 172 * packets that went through it from ones that get reflected 173 * by a broken gateway). These interfaces are never linked into 174 * the system ifnet list & no routes point to them. I.e., packets 175 * can't be sent this way. They only exist as a placeholder for 176 * multicast source verification. 177 */ 178 struct ifnet multicast_register_if; 179 180 #define ENCAP_HOPS 64 181 182 /* 183 * Private variables. 184 */ 185 static mifi_t nummifs = 0; 186 static mifi_t reg_mif_num = (mifi_t)-1; 187 188 static struct pim6stat pim6stat; 189 static int pim6; 190 191 /* 192 * Hash function for a source, group entry 193 */ 194 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 195 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 196 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 197 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 198 199 /* 200 * Find a route for a given origin IPv6 address and Multicast group address. 201 * Quality of service parameter to be added in the future!!! 202 */ 203 204 #define MF6CFIND(o, g, rt) do { \ 205 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 206 rt = NULL; \ 207 mrt6stat.mrt6s_mfc_lookups++; \ 208 while (_rt) { \ 209 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 210 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 211 (_rt->mf6c_stall == NULL)) { \ 212 rt = _rt; \ 213 break; \ 214 } \ 215 _rt = _rt->mf6c_next; \ 216 } \ 217 if (rt == NULL) { \ 218 mrt6stat.mrt6s_mfc_misses++; \ 219 } \ 220 } while (/*CONSTCOND*/ 0) 221 222 /* 223 * Macros to compute elapsed time efficiently 224 * Borrowed from Van Jacobson's scheduling code 225 */ 226 #define TV_DELTA(a, b, delta) do { \ 227 int xxs; \ 228 \ 229 delta = (a).tv_usec - (b).tv_usec; \ 230 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 231 switch (xxs) { \ 232 case 2: \ 233 delta += 1000000; \ 234 /* FALLTHROUGH */ \ 235 case 1: \ 236 delta += 1000000; \ 237 break; \ 238 default: \ 239 delta += (1000000 * xxs); \ 240 } \ 241 } \ 242 } while (/*CONSTCOND*/ 0) 243 244 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 245 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 246 247 #ifdef UPCALL_TIMING 248 #define UPCALL_MAX 50 249 u_long upcall_data[UPCALL_MAX + 1]; 250 static void collate(); 251 #endif /* UPCALL_TIMING */ 252 253 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 254 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 255 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 256 static int add_m6if __P((struct mif6ctl *)); 257 static int del_m6if __P((mifi_t *)); 258 static int add_m6fc __P((struct mf6cctl *)); 259 static int del_m6fc __P((struct mf6cctl *)); 260 261 static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER; 262 263 /* 264 * Handle MRT setsockopt commands to modify the multicast routing tables. 265 */ 266 int 267 ip6_mrouter_set(cmd, so, m) 268 int cmd; 269 struct socket *so; 270 struct mbuf *m; 271 { 272 if (cmd != MRT6_INIT && so != ip6_mrouter) 273 return EACCES; 274 275 switch (cmd) { 276 case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd); 277 case MRT6_INIT: return ip6_mrouter_init(so, m, cmd); 278 case MRT6_DONE: return ip6_mrouter_done(); 279 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 280 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 281 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 282 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 283 case MRT6_PIM: return set_pim6(mtod(m, int *)); 284 default: return EOPNOTSUPP; 285 } 286 } 287 288 /* 289 * Handle MRT getsockopt commands 290 */ 291 int 292 ip6_mrouter_get(cmd, so, m) 293 int cmd; 294 struct socket *so; 295 struct mbuf **m; 296 { 297 struct mbuf *mb; 298 299 if (so != ip6_mrouter) return EACCES; 300 301 *m = mb = m_get(M_WAIT, MT_SOOPTS); 302 303 switch (cmd) { 304 case MRT6_PIM: 305 return get_pim6(mb); 306 default: 307 m_free(mb); 308 return EOPNOTSUPP; 309 } 310 } 311 312 /* 313 * Handle ioctl commands to obtain information from the cache 314 */ 315 int 316 mrt6_ioctl(cmd, data) 317 int cmd; 318 caddr_t data; 319 { 320 321 switch (cmd) { 322 case SIOCGETSGCNT_IN6: 323 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 324 case SIOCGETMIFCNT_IN6: 325 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 326 default: 327 return (EINVAL); 328 } 329 } 330 331 /* 332 * returns the packet, byte, rpf-failure count for the source group provided 333 */ 334 static int 335 get_sg_cnt(req) 336 struct sioc_sg_req6 *req; 337 { 338 struct mf6c *rt; 339 int s; 340 341 s = splsoftnet(); 342 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 343 splx(s); 344 if (rt != NULL) { 345 req->pktcnt = rt->mf6c_pkt_cnt; 346 req->bytecnt = rt->mf6c_byte_cnt; 347 req->wrong_if = rt->mf6c_wrong_if; 348 } else 349 return (ESRCH); 350 #if 0 351 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 352 #endif 353 354 return 0; 355 } 356 357 /* 358 * returns the input and output packet and byte counts on the mif provided 359 */ 360 static int 361 get_mif6_cnt(req) 362 struct sioc_mif_req6 *req; 363 { 364 mifi_t mifi = req->mifi; 365 366 if (mifi >= nummifs) 367 return EINVAL; 368 369 req->icount = mif6table[mifi].m6_pkt_in; 370 req->ocount = mif6table[mifi].m6_pkt_out; 371 req->ibytes = mif6table[mifi].m6_bytes_in; 372 req->obytes = mif6table[mifi].m6_bytes_out; 373 374 return 0; 375 } 376 377 /* 378 * Get PIM processiong global 379 */ 380 static int 381 get_pim6(m) 382 struct mbuf *m; 383 { 384 int *i; 385 386 i = mtod(m, int *); 387 388 *i = pim6; 389 390 return 0; 391 } 392 393 static int 394 set_pim6(i) 395 int *i; 396 { 397 if ((*i != 1) && (*i != 0)) 398 return EINVAL; 399 400 pim6 = *i; 401 402 return 0; 403 } 404 405 /* 406 * Enable multicast routing 407 */ 408 static int 409 ip6_mrouter_init(so, m, cmd) 410 struct socket *so; 411 struct mbuf *m; 412 int cmd; 413 { 414 int *v; 415 416 #ifdef MRT6DEBUG 417 if (mrt6debug) 418 log(LOG_DEBUG, 419 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 420 so->so_type, so->so_proto->pr_protocol); 421 #endif 422 423 if (so->so_type != SOCK_RAW || 424 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 425 return EOPNOTSUPP; 426 427 if (!m || (m->m_len != sizeof(int *))) 428 return ENOPROTOOPT; 429 430 v = mtod(m, int *); 431 if (*v != 1) 432 return ENOPROTOOPT; 433 434 if (ip6_mrouter != NULL) return EADDRINUSE; 435 436 ip6_mrouter = so; 437 ip6_mrouter_ver = cmd; 438 439 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 440 bzero((caddr_t)n6expire, sizeof(n6expire)); 441 442 pim6 = 0;/* used for stubbing out/in pim stuff */ 443 444 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 445 expire_upcalls, NULL); 446 447 #ifdef MRT6DEBUG 448 if (mrt6debug) 449 log(LOG_DEBUG, "ip6_mrouter_init\n"); 450 #endif 451 452 return 0; 453 } 454 455 /* 456 * Disable multicast routing 457 */ 458 int 459 ip6_mrouter_done() 460 { 461 mifi_t mifi; 462 int i; 463 struct ifnet *ifp; 464 struct in6_ifreq ifr; 465 struct mf6c *rt; 466 struct rtdetq *rte; 467 int s; 468 469 s = splsoftnet(); 470 471 /* 472 * For each phyint in use, disable promiscuous reception of all IPv6 473 * multicasts. 474 */ 475 #ifdef INET 476 #ifdef MROUTING 477 /* 478 * If there is still IPv4 multicast routing daemon, 479 * we remain interfaces to receive all muliticasted packets. 480 * XXX: there may be an interface in which the IPv4 multicast 481 * daemon is not interested... 482 */ 483 if (!ip_mrouter) 484 #endif 485 #endif 486 { 487 for (mifi = 0; mifi < nummifs; mifi++) { 488 if (mif6table[mifi].m6_ifp && 489 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 490 ifr.ifr_addr.sin6_family = AF_INET6; 491 ifr.ifr_addr.sin6_addr= in6addr_any; 492 ifp = mif6table[mifi].m6_ifp; 493 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 494 (caddr_t)&ifr); 495 } 496 } 497 } 498 #ifdef notyet 499 bzero((caddr_t)qtable, sizeof(qtable)); 500 bzero((caddr_t)tbftable, sizeof(tbftable)); 501 #endif 502 bzero((caddr_t)mif6table, sizeof(mif6table)); 503 nummifs = 0; 504 505 pim6 = 0; /* used to stub out/in pim specific code */ 506 507 callout_stop(&expire_upcalls_ch); 508 509 /* 510 * Free all multicast forwarding cache entries. 511 */ 512 for (i = 0; i < MF6CTBLSIZ; i++) { 513 rt = mf6ctable[i]; 514 while (rt) { 515 struct mf6c *frt; 516 517 for (rte = rt->mf6c_stall; rte != NULL; ) { 518 struct rtdetq *n = rte->next; 519 520 m_free(rte->m); 521 free(rte, M_MRTABLE); 522 rte = n; 523 } 524 frt = rt; 525 rt = rt->mf6c_next; 526 free(frt, M_MRTABLE); 527 } 528 } 529 530 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 531 532 /* 533 * Reset de-encapsulation cache 534 */ 535 reg_mif_num = -1; 536 537 ip6_mrouter = NULL; 538 ip6_mrouter_ver = 0; 539 540 splx(s); 541 542 #ifdef MRT6DEBUG 543 if (mrt6debug) 544 log(LOG_DEBUG, "ip6_mrouter_done\n"); 545 #endif 546 547 return 0; 548 } 549 550 void 551 ip6_mrouter_detach(ifp) 552 struct ifnet *ifp; 553 { 554 struct rtdetq *rte; 555 struct mf6c *mfc; 556 mifi_t mifi; 557 int i; 558 559 /* 560 * Delete a mif which points to ifp. 561 */ 562 for (mifi = 0; mifi < nummifs; mifi++) 563 if (mif6table[mifi].m6_ifp == ifp) 564 del_m6if(&mifi); 565 566 /* 567 * Clear rte->ifp of cache entries received on ifp. 568 */ 569 for (i = 0; i < MF6CTBLSIZ; i++) { 570 if (n6expire[i] == 0) 571 continue; 572 573 for (mfc = mf6ctable[i]; mfc != NULL; mfc = mfc->mf6c_next) { 574 for (rte = mfc->mf6c_stall; rte != NULL; rte = rte->next) { 575 if (rte->ifp == ifp) 576 rte->ifp = NULL; 577 } 578 } 579 } 580 } 581 582 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 583 584 /* 585 * Add a mif to the mif table 586 */ 587 static int 588 add_m6if(mifcp) 589 struct mif6ctl *mifcp; 590 { 591 struct mif6 *mifp; 592 struct ifnet *ifp; 593 struct in6_ifreq ifr; 594 int error, s; 595 #ifdef notyet 596 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 597 #endif 598 599 if (mifcp->mif6c_mifi >= MAXMIFS) 600 return EINVAL; 601 mifp = mif6table + mifcp->mif6c_mifi; 602 if (mifp->m6_ifp) 603 return EADDRINUSE; /* XXX: is it appropriate? */ 604 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 605 return ENXIO; 606 /* 607 * XXX: some OSes can remove ifp and clear ifindex2ifnet[id] 608 * even for id between 0 and if_index. 609 */ 610 if ((ifp = ifindex2ifnet[mifcp->mif6c_pifi]) == NULL) 611 return ENXIO; 612 613 if (mifcp->mif6c_flags & MIFF_REGISTER) { 614 if (reg_mif_num == (mifi_t)-1) { 615 strlcpy(multicast_register_if.if_xname, 616 "register_mif", 617 sizeof(multicast_register_if.if_xname)); 618 multicast_register_if.if_flags |= IFF_LOOPBACK; 619 multicast_register_if.if_index = mifcp->mif6c_mifi; 620 reg_mif_num = mifcp->mif6c_mifi; 621 } 622 623 ifp = &multicast_register_if; 624 625 } /* if REGISTER */ 626 else { 627 /* Make sure the interface supports multicast */ 628 if ((ifp->if_flags & IFF_MULTICAST) == 0) 629 return EOPNOTSUPP; 630 631 s = splsoftnet(); 632 /* 633 * Enable promiscuous reception of all IPv6 multicasts 634 * from the interface. 635 */ 636 ifr.ifr_addr.sin6_family = AF_INET6; 637 ifr.ifr_addr.sin6_addr = in6addr_any; 638 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 639 splx(s); 640 if (error) 641 return error; 642 } 643 644 s = splsoftnet(); 645 mifp->m6_flags = mifcp->mif6c_flags; 646 mifp->m6_ifp = ifp; 647 #ifdef notyet 648 /* scaling up here allows division by 1024 in critical code */ 649 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 650 #endif 651 /* initialize per mif pkt counters */ 652 mifp->m6_pkt_in = 0; 653 mifp->m6_pkt_out = 0; 654 mifp->m6_bytes_in = 0; 655 mifp->m6_bytes_out = 0; 656 splx(s); 657 658 /* Adjust nummifs up if the mifi is higher than nummifs */ 659 if (nummifs <= mifcp->mif6c_mifi) 660 nummifs = mifcp->mif6c_mifi + 1; 661 662 #ifdef MRT6DEBUG 663 if (mrt6debug) 664 log(LOG_DEBUG, 665 "add_mif #%d, phyint %s%d\n", 666 mifcp->mif6c_mifi, 667 ifp->if_name, ifp->if_unit); 668 #endif 669 670 return 0; 671 } 672 673 /* 674 * Delete a mif from the mif table 675 */ 676 static int 677 del_m6if(mifip) 678 mifi_t *mifip; 679 { 680 struct mif6 *mifp = mif6table + *mifip; 681 mifi_t mifi; 682 struct ifnet *ifp; 683 struct in6_ifreq ifr; 684 int s; 685 686 if (*mifip >= nummifs) 687 return EINVAL; 688 if (mifp->m6_ifp == NULL) 689 return EINVAL; 690 691 s = splsoftnet(); 692 693 if (!(mifp->m6_flags & MIFF_REGISTER)) { 694 /* 695 * XXX: what if there is yet IPv4 multicast daemon 696 * using the interface? 697 */ 698 ifp = mifp->m6_ifp; 699 700 ifr.ifr_addr.sin6_family = AF_INET6; 701 ifr.ifr_addr.sin6_addr = in6addr_any; 702 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 703 } 704 705 #ifdef notyet 706 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 707 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 708 #endif 709 bzero((caddr_t)mifp, sizeof (*mifp)); 710 711 /* Adjust nummifs down */ 712 for (mifi = nummifs; mifi > 0; mifi--) 713 if (mif6table[mifi - 1].m6_ifp) 714 break; 715 nummifs = mifi; 716 717 splx(s); 718 719 #ifdef MRT6DEBUG 720 if (mrt6debug) 721 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 722 #endif 723 724 return 0; 725 } 726 727 /* 728 * Add an mfc entry 729 */ 730 static int 731 add_m6fc(mfccp) 732 struct mf6cctl *mfccp; 733 { 734 struct mf6c *rt; 735 u_long hash; 736 struct rtdetq *rte; 737 u_short nstl; 738 int s; 739 740 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 741 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 742 743 /* If an entry already exists, just update the fields */ 744 if (rt) { 745 #ifdef MRT6DEBUG 746 if (mrt6debug & DEBUG_MFC) 747 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 748 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 749 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 750 mfccp->mf6cc_parent); 751 #endif 752 753 s = splsoftnet(); 754 rt->mf6c_parent = mfccp->mf6cc_parent; 755 rt->mf6c_ifset = mfccp->mf6cc_ifset; 756 splx(s); 757 return 0; 758 } 759 760 /* 761 * Find the entry for which the upcall was made and update 762 */ 763 s = splsoftnet(); 764 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 765 mfccp->mf6cc_mcastgrp.sin6_addr); 766 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 767 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 768 &mfccp->mf6cc_origin.sin6_addr) && 769 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 770 &mfccp->mf6cc_mcastgrp.sin6_addr) && 771 (rt->mf6c_stall != NULL)) { 772 773 if (nstl++) 774 log(LOG_ERR, 775 "add_m6fc: %s o %s g %s p %x dbx %p\n", 776 "multiple kernel entries", 777 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 778 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 779 mfccp->mf6cc_parent, rt->mf6c_stall); 780 781 #ifdef MRT6DEBUG 782 if (mrt6debug & DEBUG_MFC) 783 log(LOG_DEBUG, 784 "add_m6fc o %s g %s p %x dbg %x\n", 785 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 786 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 787 mfccp->mf6cc_parent, rt->mf6c_stall); 788 #endif 789 790 rt->mf6c_origin = mfccp->mf6cc_origin; 791 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 792 rt->mf6c_parent = mfccp->mf6cc_parent; 793 rt->mf6c_ifset = mfccp->mf6cc_ifset; 794 /* initialize pkt counters per src-grp */ 795 rt->mf6c_pkt_cnt = 0; 796 rt->mf6c_byte_cnt = 0; 797 rt->mf6c_wrong_if = 0; 798 799 rt->mf6c_expire = 0; /* Don't clean this guy up */ 800 n6expire[hash]--; 801 802 /* free packets Qed at the end of this entry */ 803 for (rte = rt->mf6c_stall; rte != NULL; ) { 804 struct rtdetq *n = rte->next; 805 if (rte->ifp) { 806 ip6_mdq(rte->m, rte->ifp, rt); 807 } 808 m_freem(rte->m); 809 #ifdef UPCALL_TIMING 810 collate(&(rte->t)); 811 #endif /* UPCALL_TIMING */ 812 free(rte, M_MRTABLE); 813 rte = n; 814 } 815 rt->mf6c_stall = NULL; 816 } 817 } 818 819 /* 820 * It is possible that an entry is being inserted without an upcall 821 */ 822 if (nstl == 0) { 823 #ifdef MRT6DEBUG 824 if (mrt6debug & DEBUG_MFC) 825 log(LOG_DEBUG, 826 "add_mfc no upcall h %d o %s g %s p %x\n", 827 hash, 828 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 829 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 830 mfccp->mf6cc_parent); 831 #endif 832 833 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 834 835 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 836 &mfccp->mf6cc_origin.sin6_addr)&& 837 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 838 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 839 840 rt->mf6c_origin = mfccp->mf6cc_origin; 841 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 842 rt->mf6c_parent = mfccp->mf6cc_parent; 843 rt->mf6c_ifset = mfccp->mf6cc_ifset; 844 /* initialize pkt counters per src-grp */ 845 rt->mf6c_pkt_cnt = 0; 846 rt->mf6c_byte_cnt = 0; 847 rt->mf6c_wrong_if = 0; 848 849 if (rt->mf6c_expire) 850 n6expire[hash]--; 851 rt->mf6c_expire = 0; 852 } 853 } 854 if (rt == NULL) { 855 /* no upcall, so make a new entry */ 856 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 857 M_NOWAIT); 858 if (rt == NULL) { 859 splx(s); 860 return ENOBUFS; 861 } 862 863 /* insert new entry at head of hash chain */ 864 rt->mf6c_origin = mfccp->mf6cc_origin; 865 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 866 rt->mf6c_parent = mfccp->mf6cc_parent; 867 rt->mf6c_ifset = mfccp->mf6cc_ifset; 868 /* initialize pkt counters per src-grp */ 869 rt->mf6c_pkt_cnt = 0; 870 rt->mf6c_byte_cnt = 0; 871 rt->mf6c_wrong_if = 0; 872 rt->mf6c_expire = 0; 873 rt->mf6c_stall = NULL; 874 875 /* link into table */ 876 rt->mf6c_next = mf6ctable[hash]; 877 mf6ctable[hash] = rt; 878 } 879 } 880 splx(s); 881 return 0; 882 } 883 884 #ifdef UPCALL_TIMING 885 /* 886 * collect delay statistics on the upcalls 887 */ 888 static void 889 collate(t) 890 struct timeval *t; 891 { 892 u_long d; 893 struct timeval tp; 894 u_long delta; 895 896 GET_TIME(tp); 897 898 if (TV_LT(*t, tp)) 899 { 900 TV_DELTA(tp, *t, delta); 901 902 d = delta >> 10; 903 if (d > UPCALL_MAX) 904 d = UPCALL_MAX; 905 906 ++upcall_data[d]; 907 } 908 } 909 #endif /* UPCALL_TIMING */ 910 911 /* 912 * Delete an mfc entry 913 */ 914 static int 915 del_m6fc(mfccp) 916 struct mf6cctl *mfccp; 917 { 918 struct sockaddr_in6 origin; 919 struct sockaddr_in6 mcastgrp; 920 struct mf6c *rt; 921 struct mf6c **nptr; 922 u_long hash; 923 int s; 924 925 origin = mfccp->mf6cc_origin; 926 mcastgrp = mfccp->mf6cc_mcastgrp; 927 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 928 929 #ifdef MRT6DEBUG 930 if (mrt6debug & DEBUG_MFC) 931 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 932 ip6_sprintf(&origin.sin6_addr), 933 ip6_sprintf(&mcastgrp.sin6_addr)); 934 #endif 935 936 s = splsoftnet(); 937 938 nptr = &mf6ctable[hash]; 939 while ((rt = *nptr) != NULL) { 940 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 941 &rt->mf6c_origin.sin6_addr) && 942 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 943 &rt->mf6c_mcastgrp.sin6_addr) && 944 rt->mf6c_stall == NULL) 945 break; 946 947 nptr = &rt->mf6c_next; 948 } 949 if (rt == NULL) { 950 splx(s); 951 return EADDRNOTAVAIL; 952 } 953 954 *nptr = rt->mf6c_next; 955 free(rt, M_MRTABLE); 956 957 splx(s); 958 959 return 0; 960 } 961 962 static int 963 socket_send(s, mm, src) 964 struct socket *s; 965 struct mbuf *mm; 966 struct sockaddr_in6 *src; 967 { 968 if (s) { 969 if (sbappendaddr(&s->so_rcv, 970 (struct sockaddr *)src, 971 mm, (struct mbuf *)0) != 0) { 972 sorwakeup(s); 973 return 0; 974 } 975 } 976 m_freem(mm); 977 return -1; 978 } 979 980 /* 981 * IPv6 multicast forwarding function. This function assumes that the packet 982 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 983 * pointed to by "ifp", and the packet is to be relayed to other networks 984 * that have members of the packet's destination IPv6 multicast group. 985 * 986 * The packet is returned unscathed to the caller, unless it is 987 * erroneous, in which case a non-zero return value tells the caller to 988 * discard it. 989 */ 990 991 int 992 ip6_mforward(ip6, ifp, m) 993 struct ip6_hdr *ip6; 994 struct ifnet *ifp; 995 struct mbuf *m; 996 { 997 struct mf6c *rt; 998 struct mif6 *mifp; 999 struct mbuf *mm; 1000 int s; 1001 mifi_t mifi; 1002 1003 #ifdef MRT6DEBUG 1004 if (mrt6debug & DEBUG_FORWARD) 1005 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1006 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 1007 ifp->if_index); 1008 #endif 1009 1010 /* 1011 * Don't forward a packet with Hop limit of zero or one, 1012 * or a packet destined to a local-only group. 1013 */ 1014 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 1015 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1016 return 0; 1017 ip6->ip6_hlim--; 1018 1019 /* 1020 * Source address check: do not forward packets with unspecified 1021 * source. It was discussed in July 2000, on ipngwg mailing list. 1022 * This is rather more serious than unicast cases, because some 1023 * MLD packets can be sent with the unspecified source address 1024 * (although such packets must normally set 1 to the hop limit field). 1025 */ 1026 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1027 ip6stat.ip6s_cantforward++; 1028 if (ip6_log_time + ip6_log_interval < time.tv_sec) { 1029 ip6_log_time = time.tv_sec; 1030 log(LOG_DEBUG, 1031 "cannot forward " 1032 "from %s to %s nxt %d received on %s\n", 1033 ip6_sprintf(&ip6->ip6_src), 1034 ip6_sprintf(&ip6->ip6_dst), 1035 ip6->ip6_nxt, 1036 m->m_pkthdr.rcvif ? 1037 if_name(m->m_pkthdr.rcvif) : "?"); 1038 } 1039 return 0; 1040 } 1041 1042 /* 1043 * Determine forwarding mifs from the forwarding cache table 1044 */ 1045 s = splsoftnet(); 1046 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1047 1048 /* Entry exists, so forward if necessary */ 1049 if (rt) { 1050 splx(s); 1051 return (ip6_mdq(m, ifp, rt)); 1052 } else { 1053 /* 1054 * If we don't have a route for packet's origin, 1055 * Make a copy of the packet & 1056 * send message to routing daemon 1057 */ 1058 1059 struct mbuf *mb0; 1060 struct rtdetq *rte; 1061 u_long hash; 1062 /* int i, npkts;*/ 1063 #ifdef UPCALL_TIMING 1064 struct timeval tp; 1065 1066 GET_TIME(tp); 1067 #endif /* UPCALL_TIMING */ 1068 1069 mrt6stat.mrt6s_no_route++; 1070 #ifdef MRT6DEBUG 1071 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1072 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1073 ip6_sprintf(&ip6->ip6_src), 1074 ip6_sprintf(&ip6->ip6_dst)); 1075 #endif 1076 1077 /* 1078 * Allocate mbufs early so that we don't do extra work if we 1079 * are just going to fail anyway. 1080 */ 1081 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1082 M_NOWAIT); 1083 if (rte == NULL) { 1084 splx(s); 1085 return ENOBUFS; 1086 } 1087 mb0 = m_copy(m, 0, M_COPYALL); 1088 /* 1089 * Pullup packet header if needed before storing it, 1090 * as other references may modify it in the meantime. 1091 */ 1092 if (mb0 && 1093 (M_READONLY(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1094 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1095 if (mb0 == NULL) { 1096 free(rte, M_MRTABLE); 1097 splx(s); 1098 return ENOBUFS; 1099 } 1100 1101 /* is there an upcall waiting for this packet? */ 1102 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1103 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1104 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1105 &rt->mf6c_origin.sin6_addr) && 1106 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1107 &rt->mf6c_mcastgrp.sin6_addr) && 1108 (rt->mf6c_stall != NULL)) 1109 break; 1110 } 1111 1112 if (rt == NULL) { 1113 struct mrt6msg *im; 1114 struct omrt6msg *oim; 1115 1116 /* no upcall, so make a new entry */ 1117 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1118 M_NOWAIT); 1119 if (rt == NULL) { 1120 free(rte, M_MRTABLE); 1121 m_freem(mb0); 1122 splx(s); 1123 return ENOBUFS; 1124 } 1125 /* 1126 * Make a copy of the header to send to the user 1127 * level process 1128 */ 1129 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1130 1131 if (mm == NULL) { 1132 free(rte, M_MRTABLE); 1133 m_freem(mb0); 1134 free(rt, M_MRTABLE); 1135 splx(s); 1136 return ENOBUFS; 1137 } 1138 1139 /* 1140 * Send message to routing daemon 1141 */ 1142 sin6.sin6_addr = ip6->ip6_src; 1143 1144 im = NULL; 1145 oim = NULL; 1146 switch (ip6_mrouter_ver) { 1147 case MRT6_OINIT: 1148 oim = mtod(mm, struct omrt6msg *); 1149 oim->im6_msgtype = MRT6MSG_NOCACHE; 1150 oim->im6_mbz = 0; 1151 break; 1152 case MRT6_INIT: 1153 im = mtod(mm, struct mrt6msg *); 1154 im->im6_msgtype = MRT6MSG_NOCACHE; 1155 im->im6_mbz = 0; 1156 break; 1157 default: 1158 free(rte, M_MRTABLE); 1159 m_freem(mb0); 1160 free(rt, M_MRTABLE); 1161 splx(s); 1162 return EINVAL; 1163 } 1164 1165 #ifdef MRT6DEBUG 1166 if (mrt6debug & DEBUG_FORWARD) 1167 log(LOG_DEBUG, 1168 "getting the iif info in the kernel\n"); 1169 #endif 1170 1171 for (mifp = mif6table, mifi = 0; 1172 mifi < nummifs && mifp->m6_ifp != ifp; 1173 mifp++, mifi++) 1174 ; 1175 1176 switch (ip6_mrouter_ver) { 1177 case MRT6_OINIT: 1178 oim->im6_mif = mifi; 1179 break; 1180 case MRT6_INIT: 1181 im->im6_mif = mifi; 1182 break; 1183 } 1184 1185 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1186 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1187 "socket queue full\n"); 1188 mrt6stat.mrt6s_upq_sockfull++; 1189 free(rte, M_MRTABLE); 1190 m_freem(mb0); 1191 free(rt, M_MRTABLE); 1192 splx(s); 1193 return ENOBUFS; 1194 } 1195 1196 mrt6stat.mrt6s_upcalls++; 1197 1198 /* insert new entry at head of hash chain */ 1199 bzero(rt, sizeof(*rt)); 1200 rt->mf6c_origin.sin6_family = AF_INET6; 1201 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1202 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1203 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1204 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1205 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1206 rt->mf6c_expire = UPCALL_EXPIRE; 1207 n6expire[hash]++; 1208 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1209 1210 /* link into table */ 1211 rt->mf6c_next = mf6ctable[hash]; 1212 mf6ctable[hash] = rt; 1213 /* Add this entry to the end of the queue */ 1214 rt->mf6c_stall = rte; 1215 } else { 1216 /* determine if q has overflowed */ 1217 struct rtdetq **p; 1218 int npkts = 0; 1219 1220 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1221 if (++npkts > MAX_UPQ6) { 1222 mrt6stat.mrt6s_upq_ovflw++; 1223 free(rte, M_MRTABLE); 1224 m_freem(mb0); 1225 splx(s); 1226 return 0; 1227 } 1228 1229 /* Add this entry to the end of the queue */ 1230 *p = rte; 1231 } 1232 1233 rte->next = NULL; 1234 rte->m = mb0; 1235 rte->ifp = ifp; 1236 #ifdef UPCALL_TIMING 1237 rte->t = tp; 1238 #endif /* UPCALL_TIMING */ 1239 1240 splx(s); 1241 1242 return 0; 1243 } 1244 } 1245 1246 /* 1247 * Clean up cache entries if upcalls are not serviced 1248 * Call from the Slow Timeout mechanism, every half second. 1249 */ 1250 static void 1251 expire_upcalls(unused) 1252 void *unused; 1253 { 1254 struct rtdetq *rte; 1255 struct mf6c *mfc, **nptr; 1256 int i; 1257 int s; 1258 1259 s = splsoftnet(); 1260 for (i = 0; i < MF6CTBLSIZ; i++) { 1261 if (n6expire[i] == 0) 1262 continue; 1263 nptr = &mf6ctable[i]; 1264 while ((mfc = *nptr) != NULL) { 1265 rte = mfc->mf6c_stall; 1266 /* 1267 * Skip real cache entries 1268 * Make sure it wasn't marked to not expire (shouldn't happen) 1269 * If it expires now 1270 */ 1271 if (rte != NULL && 1272 mfc->mf6c_expire != 0 && 1273 --mfc->mf6c_expire == 0) { 1274 #ifdef MRT6DEBUG 1275 if (mrt6debug & DEBUG_EXPIRE) 1276 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1277 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1278 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1279 #endif 1280 /* 1281 * drop all the packets 1282 * free the mbuf with the pkt, if, timing info 1283 */ 1284 do { 1285 struct rtdetq *n = rte->next; 1286 m_freem(rte->m); 1287 free(rte, M_MRTABLE); 1288 rte = n; 1289 } while (rte != NULL); 1290 mrt6stat.mrt6s_cache_cleanups++; 1291 n6expire[i]--; 1292 1293 *nptr = mfc->mf6c_next; 1294 free(mfc, M_MRTABLE); 1295 } else { 1296 nptr = &mfc->mf6c_next; 1297 } 1298 } 1299 } 1300 splx(s); 1301 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1302 expire_upcalls, NULL); 1303 } 1304 1305 /* 1306 * Packet forwarding routine once entry in the cache is made 1307 */ 1308 static int 1309 ip6_mdq(m, ifp, rt) 1310 struct mbuf *m; 1311 struct ifnet *ifp; 1312 struct mf6c *rt; 1313 { 1314 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1315 mifi_t mifi, iif; 1316 struct mif6 *mifp; 1317 int plen = m->m_pkthdr.len; 1318 1319 /* 1320 * Macro to send packet on mif. Since RSVP packets don't get counted on 1321 * input, they shouldn't get counted on output, so statistics keeping is 1322 * separate. 1323 */ 1324 1325 #define MC6_SEND(ip6, mifp, m) do { \ 1326 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1327 register_send((ip6), (mifp), (m)); \ 1328 else \ 1329 phyint_send((ip6), (mifp), (m)); \ 1330 } while (/*CONSTCOND*/ 0) 1331 1332 /* 1333 * Don't forward if it didn't arrive from the parent mif 1334 * for its origin. 1335 */ 1336 mifi = rt->mf6c_parent; 1337 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1338 /* came in the wrong interface */ 1339 #ifdef MRT6DEBUG 1340 if (mrt6debug & DEBUG_FORWARD) 1341 log(LOG_DEBUG, 1342 "wrong if: ifid %d mifi %d mififid %x\n", 1343 ifp->if_index, mifi, 1344 mif6table[mifi].m6_ifp ? 1345 mif6table[mifi].m6_ifp->if_index : -1); 1346 #endif 1347 mrt6stat.mrt6s_wrong_if++; 1348 rt->mf6c_wrong_if++; 1349 /* 1350 * If we are doing PIM processing, and we are forwarding 1351 * packets on this interface, send a message to the 1352 * routing daemon. 1353 */ 1354 /* have to make sure this is a valid mif */ 1355 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1356 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1357 /* 1358 * Check the M_LOOP flag to avoid an 1359 * unnecessary PIM assert. 1360 * XXX: M_LOOP is an ad-hoc hack... 1361 */ 1362 static struct sockaddr_in6 sin6 = 1363 { sizeof(sin6), AF_INET6 }; 1364 1365 struct mbuf *mm; 1366 struct mrt6msg *im; 1367 struct omrt6msg *oim; 1368 1369 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1370 if (mm && 1371 (M_READONLY(mm) || 1372 mm->m_len < sizeof(struct ip6_hdr))) 1373 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1374 if (mm == NULL) 1375 return ENOBUFS; 1376 1377 oim = NULL; 1378 im = NULL; 1379 switch (ip6_mrouter_ver) { 1380 case MRT6_OINIT: 1381 oim = mtod(mm, struct omrt6msg *); 1382 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1383 oim->im6_mbz = 0; 1384 break; 1385 case MRT6_INIT: 1386 im = mtod(mm, struct mrt6msg *); 1387 im->im6_msgtype = MRT6MSG_WRONGMIF; 1388 im->im6_mbz = 0; 1389 break; 1390 default: 1391 m_freem(mm); 1392 return EINVAL; 1393 } 1394 1395 for (mifp = mif6table, iif = 0; 1396 iif < nummifs && mifp && 1397 mifp->m6_ifp != ifp; 1398 mifp++, iif++) 1399 ; 1400 1401 switch (ip6_mrouter_ver) { 1402 case MRT6_OINIT: 1403 oim->im6_mif = iif; 1404 sin6.sin6_addr = oim->im6_src; 1405 break; 1406 case MRT6_INIT: 1407 im->im6_mif = iif; 1408 sin6.sin6_addr = im->im6_src; 1409 break; 1410 } 1411 1412 mrt6stat.mrt6s_upcalls++; 1413 1414 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1415 #ifdef MRT6DEBUG 1416 if (mrt6debug) 1417 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1418 #endif 1419 ++mrt6stat.mrt6s_upq_sockfull; 1420 return ENOBUFS; 1421 } /* if socket Q full */ 1422 } /* if PIM */ 1423 return 0; 1424 } /* if wrong iif */ 1425 1426 /* If I sourced this packet, it counts as output, else it was input. */ 1427 if (m->m_pkthdr.rcvif == NULL) { 1428 /* XXX: is rcvif really NULL when output?? */ 1429 mif6table[mifi].m6_pkt_out++; 1430 mif6table[mifi].m6_bytes_out += plen; 1431 } else { 1432 mif6table[mifi].m6_pkt_in++; 1433 mif6table[mifi].m6_bytes_in += plen; 1434 } 1435 rt->mf6c_pkt_cnt++; 1436 rt->mf6c_byte_cnt += plen; 1437 1438 /* 1439 * For each mif, forward a copy of the packet if there are group 1440 * members downstream on the interface. 1441 */ 1442 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1443 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1444 if (mif6table[mifi].m6_ifp == NULL) 1445 continue; 1446 #ifdef notyet 1447 /* 1448 * check if the outgoing packet is going to break 1449 * a scope boundary. 1450 * XXX For packets through PIM register tunnel 1451 * interface, we believe a routing daemon. 1452 */ 1453 if ((mif6table[rt->mf6c_parent].m6_flags & 1454 MIFF_REGISTER) == 0 && 1455 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1456 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1457 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1458 &ip6->ip6_dst) || 1459 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1460 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1461 &ip6->ip6_src))) { 1462 ip6stat.ip6s_badscope++; 1463 continue; 1464 } 1465 #endif 1466 1467 mifp->m6_pkt_out++; 1468 mifp->m6_bytes_out += plen; 1469 MC6_SEND(ip6, mifp, m); 1470 } 1471 return 0; 1472 } 1473 1474 static void 1475 phyint_send(ip6, mifp, m) 1476 struct ip6_hdr *ip6; 1477 struct mif6 *mifp; 1478 struct mbuf *m; 1479 { 1480 struct mbuf *mb_copy; 1481 struct ifnet *ifp = mifp->m6_ifp; 1482 int error = 0; 1483 int s = splsoftnet(); 1484 static struct route_in6 ro; 1485 struct in6_multi *in6m; 1486 struct sockaddr_in6 *dst6; 1487 u_long linkmtu; 1488 1489 /* 1490 * Make a new reference to the packet; make sure that 1491 * the IPv6 header is actually copied, not just referenced, 1492 * so that ip6_output() only scribbles on the copy. 1493 */ 1494 mb_copy = m_copy(m, 0, M_COPYALL); 1495 if (mb_copy && 1496 (M_READONLY(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1497 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1498 if (mb_copy == NULL) { 1499 splx(s); 1500 return; 1501 } 1502 /* set MCAST flag to the outgoing packet */ 1503 mb_copy->m_flags |= M_MCAST; 1504 1505 /* 1506 * If we sourced the packet, call ip6_output since we may devide 1507 * the packet into fragments when the packet is too big for the 1508 * outgoing interface. 1509 * Otherwise, we can simply send the packet to the interface 1510 * sending queue. 1511 */ 1512 if (m->m_pkthdr.rcvif == NULL) { 1513 struct ip6_moptions im6o; 1514 1515 im6o.im6o_multicast_ifp = ifp; 1516 /* XXX: ip6_output will override ip6->ip6_hlim */ 1517 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1518 im6o.im6o_multicast_loop = 1; 1519 error = ip6_output(mb_copy, NULL, &ro, 1520 IPV6_FORWARDING, &im6o, NULL); 1521 1522 #ifdef MRT6DEBUG 1523 if (mrt6debug & DEBUG_XMIT) 1524 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1525 mifp - mif6table, error); 1526 #endif 1527 splx(s); 1528 return; 1529 } 1530 1531 /* 1532 * If we belong to the destination multicast group 1533 * on the outgoing interface, loop back a copy. 1534 */ 1535 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1536 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1537 if (in6m != NULL) { 1538 dst6->sin6_len = sizeof(struct sockaddr_in6); 1539 dst6->sin6_family = AF_INET6; 1540 dst6->sin6_addr = ip6->ip6_dst; 1541 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1542 } 1543 /* 1544 * Put the packet into the sending queue of the outgoing interface 1545 * if it would fit in the MTU of the interface. 1546 */ 1547 linkmtu = IN6_LINKMTU(ifp); 1548 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1549 dst6->sin6_len = sizeof(struct sockaddr_in6); 1550 dst6->sin6_family = AF_INET6; 1551 dst6->sin6_addr = ip6->ip6_dst; 1552 /* 1553 * We just call if_output instead of nd6_output here, since 1554 * we need no ND for a multicast forwarded packet...right? 1555 */ 1556 error = (*ifp->if_output)(ifp, mb_copy, 1557 (struct sockaddr *)&ro.ro_dst, NULL); 1558 #ifdef MRT6DEBUG 1559 if (mrt6debug & DEBUG_XMIT) 1560 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1561 mifp - mif6table, error); 1562 #endif 1563 } else { 1564 #ifdef MULTICAST_PMTUD 1565 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1566 #else 1567 #ifdef MRT6DEBUG 1568 if (mrt6debug & DEBUG_XMIT) 1569 log(LOG_DEBUG, 1570 "phyint_send: packet too big on %s o %s g %s" 1571 " size %d(discarded)\n", 1572 if_name(ifp), 1573 ip6_sprintf(&ip6->ip6_src), 1574 ip6_sprintf(&ip6->ip6_dst), 1575 mb_copy->m_pkthdr.len); 1576 #endif /* MRT6DEBUG */ 1577 m_freem(mb_copy); /* simply discard the packet */ 1578 #endif 1579 } 1580 1581 splx(s); 1582 } 1583 1584 static int 1585 register_send(ip6, mif, m) 1586 struct ip6_hdr *ip6; 1587 struct mif6 *mif; 1588 struct mbuf *m; 1589 { 1590 struct mbuf *mm; 1591 int i, len = m->m_pkthdr.len; 1592 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1593 struct mrt6msg *im6; 1594 1595 #ifdef MRT6DEBUG 1596 if (mrt6debug) 1597 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1598 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1599 #endif 1600 ++pim6stat.pim6s_snd_registers; 1601 1602 /* Make a copy of the packet to send to the user level process */ 1603 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1604 if (mm == NULL) 1605 return ENOBUFS; 1606 mm->m_data += max_linkhdr; 1607 mm->m_len = sizeof(struct ip6_hdr); 1608 1609 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1610 m_freem(mm); 1611 return ENOBUFS; 1612 } 1613 i = MHLEN - M_LEADINGSPACE(mm); 1614 if (i > len) 1615 i = len; 1616 mm = m_pullup(mm, i); 1617 if (mm == NULL) 1618 return ENOBUFS; 1619 /* TODO: check it! */ 1620 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1621 1622 /* 1623 * Send message to routing daemon 1624 */ 1625 sin6.sin6_addr = ip6->ip6_src; 1626 1627 im6 = mtod(mm, struct mrt6msg *); 1628 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1629 im6->im6_mbz = 0; 1630 1631 im6->im6_mif = mif - mif6table; 1632 1633 /* iif info is not given for reg. encap.n */ 1634 mrt6stat.mrt6s_upcalls++; 1635 1636 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1637 #ifdef MRT6DEBUG 1638 if (mrt6debug) 1639 log(LOG_WARNING, 1640 "register_send: ip6_mrouter socket queue full\n"); 1641 #endif 1642 ++mrt6stat.mrt6s_upq_sockfull; 1643 return ENOBUFS; 1644 } 1645 return 0; 1646 } 1647 1648 /* 1649 * PIM sparse mode hook 1650 * Receives the pim control messages, and passes them up to the listening 1651 * socket, using rip6_input. 1652 * The only message processed is the REGISTER pim message; the pim header 1653 * is stripped off, and the inner packet is passed to register_mforward. 1654 */ 1655 int 1656 pim6_input(mp, offp, proto) 1657 struct mbuf **mp; 1658 int *offp, proto; 1659 { 1660 struct pim *pim; /* pointer to a pim struct */ 1661 struct ip6_hdr *ip6; 1662 int pimlen; 1663 struct mbuf *m = *mp; 1664 int minlen; 1665 int off = *offp; 1666 1667 ++pim6stat.pim6s_rcv_total; 1668 1669 ip6 = mtod(m, struct ip6_hdr *); 1670 pimlen = m->m_pkthdr.len - *offp; 1671 1672 /* 1673 * Validate lengths 1674 */ 1675 if (pimlen < PIM_MINLEN) { 1676 ++pim6stat.pim6s_rcv_tooshort; 1677 #ifdef MRT6DEBUG 1678 if (mrt6debug & DEBUG_PIM) 1679 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1680 #endif 1681 m_freem(m); 1682 return (IPPROTO_DONE); 1683 } 1684 1685 /* 1686 * if the packet is at least as big as a REGISTER, go ahead 1687 * and grab the PIM REGISTER header size, to avoid another 1688 * possible m_pullup() later. 1689 * 1690 * PIM_MINLEN == pimhdr + u_int32 == 8 1691 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1692 */ 1693 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1694 1695 /* 1696 * Make sure that the IP6 and PIM headers in contiguous memory, and 1697 * possibly the PIM REGISTER header 1698 */ 1699 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1700 if (pim == NULL) { 1701 pim6stat.pim6s_rcv_tooshort++; 1702 return IPPROTO_DONE; 1703 } 1704 1705 /* PIM version check */ 1706 if (pim->pim_ver != PIM_VERSION) { 1707 ++pim6stat.pim6s_rcv_badversion; 1708 #ifdef MRT6DEBUG 1709 log(LOG_ERR, 1710 "pim6_input: incorrect version %d, expecting %d\n", 1711 pim->pim_ver, PIM_VERSION); 1712 #endif 1713 m_freem(m); 1714 return (IPPROTO_DONE); 1715 } 1716 1717 #define PIM6_CHECKSUM 1718 #ifdef PIM6_CHECKSUM 1719 { 1720 int cksumlen; 1721 1722 /* 1723 * Validate checksum. 1724 * If PIM REGISTER, exclude the data packet 1725 */ 1726 if (pim->pim_type == PIM_REGISTER) 1727 cksumlen = PIM_MINLEN; 1728 else 1729 cksumlen = pimlen; 1730 1731 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1732 ++pim6stat.pim6s_rcv_badsum; 1733 #ifdef MRT6DEBUG 1734 if (mrt6debug & DEBUG_PIM) 1735 log(LOG_DEBUG, 1736 "pim6_input: invalid checksum\n"); 1737 #endif 1738 m_freem(m); 1739 return (IPPROTO_DONE); 1740 } 1741 } 1742 #endif /* PIM_CHECKSUM */ 1743 1744 if (pim->pim_type == PIM_REGISTER) { 1745 /* 1746 * since this is a REGISTER, we'll make a copy of the register 1747 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1748 * routing daemon. 1749 */ 1750 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1751 1752 struct mbuf *mcp; 1753 struct ip6_hdr *eip6; 1754 u_int32_t *reghdr; 1755 int rc; 1756 1757 ++pim6stat.pim6s_rcv_registers; 1758 1759 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1760 #ifdef MRT6DEBUG 1761 if (mrt6debug & DEBUG_PIM) 1762 log(LOG_DEBUG, 1763 "pim6_input: register mif not set: %d\n", 1764 reg_mif_num); 1765 #endif 1766 m_freem(m); 1767 return (IPPROTO_DONE); 1768 } 1769 1770 reghdr = (u_int32_t *)(pim + 1); 1771 1772 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1773 goto pim6_input_to_daemon; 1774 1775 /* 1776 * Validate length 1777 */ 1778 if (pimlen < PIM6_REG_MINLEN) { 1779 ++pim6stat.pim6s_rcv_tooshort; 1780 ++pim6stat.pim6s_rcv_badregisters; 1781 #ifdef MRT6DEBUG 1782 log(LOG_ERR, 1783 "pim6_input: register packet size too " 1784 "small %d from %s\n", 1785 pimlen, ip6_sprintf(&ip6->ip6_src)); 1786 #endif 1787 m_freem(m); 1788 return (IPPROTO_DONE); 1789 } 1790 1791 eip6 = (struct ip6_hdr *) (reghdr + 1); 1792 #ifdef MRT6DEBUG 1793 if (mrt6debug & DEBUG_PIM) 1794 log(LOG_DEBUG, 1795 "pim6_input[register], eip6: %s -> %s, " 1796 "eip6 plen %d\n", 1797 ip6_sprintf(&eip6->ip6_src), 1798 ip6_sprintf(&eip6->ip6_dst), 1799 ntohs(eip6->ip6_plen)); 1800 #endif 1801 1802 /* verify the version number of the inner packet */ 1803 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1804 ++pim6stat.pim6s_rcv_badregisters; 1805 #ifdef MRT6DEBUG 1806 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1807 "of the inner packet\n", 1808 (eip6->ip6_vfc & IPV6_VERSION)); 1809 #endif 1810 m_freem(m); 1811 return (IPPROTO_NONE); 1812 } 1813 1814 /* verify the inner packet is destined to a mcast group */ 1815 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1816 ++pim6stat.pim6s_rcv_badregisters; 1817 #ifdef MRT6DEBUG 1818 if (mrt6debug & DEBUG_PIM) 1819 log(LOG_DEBUG, 1820 "pim6_input: inner packet of register " 1821 "is not multicast %s\n", 1822 ip6_sprintf(&eip6->ip6_dst)); 1823 #endif 1824 m_freem(m); 1825 return (IPPROTO_DONE); 1826 } 1827 1828 /* 1829 * make a copy of the whole header to pass to the daemon later. 1830 */ 1831 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1832 if (mcp == NULL) { 1833 #ifdef MRT6DEBUG 1834 log(LOG_ERR, 1835 "pim6_input: pim register: " 1836 "could not copy register head\n"); 1837 #endif 1838 m_freem(m); 1839 return (IPPROTO_DONE); 1840 } 1841 1842 /* 1843 * forward the inner ip6 packet; point m_data at the inner ip6. 1844 */ 1845 m_adj(m, off + PIM_MINLEN); 1846 #ifdef MRT6DEBUG 1847 if (mrt6debug & DEBUG_PIM) { 1848 log(LOG_DEBUG, 1849 "pim6_input: forwarding decapsulated register: " 1850 "src %s, dst %s, mif %d\n", 1851 ip6_sprintf(&eip6->ip6_src), 1852 ip6_sprintf(&eip6->ip6_dst), 1853 reg_mif_num); 1854 } 1855 #endif 1856 1857 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1858 (struct sockaddr *) &dst, 1859 (struct rtentry *) NULL); 1860 1861 /* prepare the register head to send to the mrouting daemon */ 1862 m = mcp; 1863 } 1864 1865 /* 1866 * Pass the PIM message up to the daemon; if it is a register message 1867 * pass the 'head' only up to the daemon. This includes the 1868 * encapsulator ip6 header, pim header, register header and the 1869 * encapsulated ip6 header. 1870 */ 1871 pim6_input_to_daemon: 1872 rip6_input(&m, offp, proto); 1873 return (IPPROTO_DONE); 1874 } 1875
Indexes created Tue Sep 23 02:09:52 GMT 2025