ip6_mroute.c revision 1.41
1 /* $NetBSD: ip6_mroute.c,v 1.41 2002/11/27 05:09:36 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 1.41 2002/11/27 05:09:36 itojun Exp $"); 89 90 #include "opt_inet.h" 91 92 #ifndef _KERNEL 93 # ifdef KERNEL 94 # define _KERNEL 95 # endif 96 #endif 97 98 #include <sys/param.h> 99 #include <sys/systm.h> 100 #include <sys/callout.h> 101 #include <sys/mbuf.h> 102 #include <sys/socket.h> 103 #include <sys/socketvar.h> 104 #include <sys/sockio.h> 105 #include <sys/protosw.h> 106 #include <sys/errno.h> 107 #include <sys/time.h> 108 #include <sys/kernel.h> 109 #include <sys/ioctl.h> 110 #include <sys/syslog.h> 111 112 #include <net/if.h> 113 #include <net/route.h> 114 #include <net/raw_cb.h> 115 116 #include <netinet/in.h> 117 #include <netinet/in_var.h> 118 #ifdef MULTICAST_PMTUD 119 #include <netinet/icmp6.h> 120 #endif 121 122 #include <netinet/ip6.h> 123 #include <netinet6/ip6_var.h> 124 #include <netinet6/ip6_mroute.h> 125 #include <netinet6/pim6.h> 126 #include <netinet6/pim6_var.h> 127 #include <netinet6/nd6.h> 128 129 #include <net/net_osdep.h> 130 131 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 132 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 133 134 static int set_pim6 __P((int *)); 135 static int get_pim6 __P((struct mbuf *)); 136 static int socket_send __P((struct socket *, struct mbuf *, 137 struct sockaddr_in6 *)); 138 static int register_send __P((struct ip6_hdr *, struct mif6 *, 139 struct mbuf *)); 140 141 /* 142 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 143 * except for netstat or debugging purposes. 144 */ 145 struct socket *ip6_mrouter = NULL; 146 int ip6_mrouter_ver = 0; 147 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 148 struct mrt6stat mrt6stat; 149 150 #define NO_RTE_FOUND 0x1 151 #define RTE_FOUND 0x2 152 153 struct mf6c *mf6ctable[MF6CTBLSIZ]; 154 u_char n6expire[MF6CTBLSIZ]; 155 static struct mif6 mif6table[MAXMIFS]; 156 #ifdef MRT6DEBUG 157 u_int mrt6debug = 0; /* debug level */ 158 #define DEBUG_MFC 0x02 159 #define DEBUG_FORWARD 0x04 160 #define DEBUG_EXPIRE 0x08 161 #define DEBUG_XMIT 0x10 162 #define DEBUG_REG 0x20 163 #define DEBUG_PIM 0x40 164 #endif 165 166 static void expire_upcalls __P((void *)); 167 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 168 #define UPCALL_EXPIRE 6 /* number of timeouts */ 169 170 #ifdef INET 171 #ifdef MROUTING 172 extern struct socket *ip_mrouter; 173 #endif 174 #endif 175 176 /* 177 * 'Interfaces' associated with decapsulator (so we can tell 178 * packets that went through it from ones that get reflected 179 * by a broken gateway). These interfaces are never linked into 180 * the system ifnet list & no routes point to them. I.e., packets 181 * can't be sent this way. They only exist as a placeholder for 182 * multicast source verification. 183 */ 184 struct ifnet multicast_register_if; 185 186 #define ENCAP_HOPS 64 187 188 /* 189 * Private variables. 190 */ 191 static mifi_t nummifs = 0; 192 static mifi_t reg_mif_num = (mifi_t)-1; 193 194 static struct pim6stat pim6stat; 195 static int pim6; 196 197 /* 198 * Hash function for a source, group entry 199 */ 200 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 201 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 202 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 203 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 204 205 /* 206 * Find a route for a given origin IPv6 address and Multicast group address. 207 * Quality of service parameter to be added in the future!!! 208 */ 209 210 #define MF6CFIND(o, g, rt) do { \ 211 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 212 rt = NULL; \ 213 mrt6stat.mrt6s_mfc_lookups++; \ 214 while (_rt) { \ 215 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 216 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 217 (_rt->mf6c_stall == NULL)) { \ 218 rt = _rt; \ 219 break; \ 220 } \ 221 _rt = _rt->mf6c_next; \ 222 } \ 223 if (rt == NULL) { \ 224 mrt6stat.mrt6s_mfc_misses++; \ 225 } \ 226 } while (/*CONSTCOND*/ 0) 227 228 /* 229 * Macros to compute elapsed time efficiently 230 * Borrowed from Van Jacobson's scheduling code 231 */ 232 #define TV_DELTA(a, b, delta) do { \ 233 int xxs; \ 234 \ 235 delta = (a).tv_usec - (b).tv_usec; \ 236 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 237 switch (xxs) { \ 238 case 2: \ 239 delta += 1000000; \ 240 /* FALLTHROUGH */ \ 241 case 1: \ 242 delta += 1000000; \ 243 break; \ 244 default: \ 245 delta += (1000000 * xxs); \ 246 } \ 247 } \ 248 } while (/*CONSTCOND*/ 0) 249 250 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 251 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 252 253 #ifdef UPCALL_TIMING 254 #define UPCALL_MAX 50 255 u_long upcall_data[UPCALL_MAX + 1]; 256 static void collate(); 257 #endif /* UPCALL_TIMING */ 258 259 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 260 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 261 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 262 static int add_m6if __P((struct mif6ctl *)); 263 static int del_m6if __P((mifi_t *)); 264 static int add_m6fc __P((struct mf6cctl *)); 265 static int del_m6fc __P((struct mf6cctl *)); 266 267 static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER; 268 269 /* 270 * Handle MRT setsockopt commands to modify the multicast routing tables. 271 */ 272 int 273 ip6_mrouter_set(cmd, so, m) 274 int cmd; 275 struct socket *so; 276 struct mbuf *m; 277 { 278 if (cmd != MRT6_INIT && so != ip6_mrouter) 279 return EACCES; 280 281 switch (cmd) { 282 case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd); 283 case MRT6_INIT: return ip6_mrouter_init(so, m, cmd); 284 case MRT6_DONE: return ip6_mrouter_done(); 285 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 286 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 287 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 288 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 289 case MRT6_PIM: return set_pim6(mtod(m, int *)); 290 default: return EOPNOTSUPP; 291 } 292 } 293 294 /* 295 * Handle MRT getsockopt commands 296 */ 297 int 298 ip6_mrouter_get(cmd, so, m) 299 int cmd; 300 struct socket *so; 301 struct mbuf **m; 302 { 303 struct mbuf *mb; 304 305 if (so != ip6_mrouter) return EACCES; 306 307 *m = mb = m_get(M_WAIT, MT_SOOPTS); 308 309 switch (cmd) { 310 case MRT6_PIM: 311 return get_pim6(mb); 312 default: 313 m_free(mb); 314 return EOPNOTSUPP; 315 } 316 } 317 318 /* 319 * Handle ioctl commands to obtain information from the cache 320 */ 321 int 322 mrt6_ioctl(cmd, data) 323 int cmd; 324 caddr_t data; 325 { 326 327 switch (cmd) { 328 case SIOCGETSGCNT_IN6: 329 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 330 case SIOCGETMIFCNT_IN6: 331 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 332 default: 333 return (EINVAL); 334 } 335 } 336 337 /* 338 * returns the packet, byte, rpf-failure count for the source group provided 339 */ 340 static int 341 get_sg_cnt(req) 342 struct sioc_sg_req6 *req; 343 { 344 struct mf6c *rt; 345 int s; 346 347 s = splsoftnet(); 348 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 349 splx(s); 350 if (rt != NULL) { 351 req->pktcnt = rt->mf6c_pkt_cnt; 352 req->bytecnt = rt->mf6c_byte_cnt; 353 req->wrong_if = rt->mf6c_wrong_if; 354 } else 355 return (ESRCH); 356 #if 0 357 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 358 #endif 359 360 return 0; 361 } 362 363 /* 364 * returns the input and output packet and byte counts on the mif provided 365 */ 366 static int 367 get_mif6_cnt(req) 368 struct sioc_mif_req6 *req; 369 { 370 mifi_t mifi = req->mifi; 371 372 if (mifi >= nummifs) 373 return EINVAL; 374 375 req->icount = mif6table[mifi].m6_pkt_in; 376 req->ocount = mif6table[mifi].m6_pkt_out; 377 req->ibytes = mif6table[mifi].m6_bytes_in; 378 req->obytes = mif6table[mifi].m6_bytes_out; 379 380 return 0; 381 } 382 383 /* 384 * Get PIM processiong global 385 */ 386 static int 387 get_pim6(m) 388 struct mbuf *m; 389 { 390 int *i; 391 392 i = mtod(m, int *); 393 394 *i = pim6; 395 396 return 0; 397 } 398 399 static int 400 set_pim6(i) 401 int *i; 402 { 403 if ((*i != 1) && (*i != 0)) 404 return EINVAL; 405 406 pim6 = *i; 407 408 return 0; 409 } 410 411 /* 412 * Enable multicast routing 413 */ 414 static int 415 ip6_mrouter_init(so, m, cmd) 416 struct socket *so; 417 struct mbuf *m; 418 int cmd; 419 { 420 int *v; 421 422 #ifdef MRT6DEBUG 423 if (mrt6debug) 424 log(LOG_DEBUG, 425 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 426 so->so_type, so->so_proto->pr_protocol); 427 #endif 428 429 if (so->so_type != SOCK_RAW || 430 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 431 return EOPNOTSUPP; 432 433 if (!m || (m->m_len != sizeof(int *))) 434 return ENOPROTOOPT; 435 436 v = mtod(m, int *); 437 if (*v != 1) 438 return ENOPROTOOPT; 439 440 if (ip6_mrouter != NULL) return EADDRINUSE; 441 442 ip6_mrouter = so; 443 ip6_mrouter_ver = cmd; 444 445 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 446 bzero((caddr_t)n6expire, sizeof(n6expire)); 447 448 pim6 = 0;/* used for stubbing out/in pim stuff */ 449 450 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 451 expire_upcalls, NULL); 452 453 #ifdef MRT6DEBUG 454 if (mrt6debug) 455 log(LOG_DEBUG, "ip6_mrouter_init\n"); 456 #endif 457 458 return 0; 459 } 460 461 /* 462 * Disable multicast routing 463 */ 464 int 465 ip6_mrouter_done() 466 { 467 mifi_t mifi; 468 int i; 469 struct ifnet *ifp; 470 struct in6_ifreq ifr; 471 struct mf6c *rt; 472 struct rtdetq *rte; 473 int s; 474 475 s = splsoftnet(); 476 477 /* 478 * For each phyint in use, disable promiscuous reception of all IPv6 479 * multicasts. 480 */ 481 #ifdef INET 482 #ifdef MROUTING 483 /* 484 * If there is still IPv4 multicast routing daemon, 485 * we remain interfaces to receive all muliticasted packets. 486 * XXX: there may be an interface in which the IPv4 multicast 487 * daemon is not interested... 488 */ 489 if (!ip_mrouter) 490 #endif 491 #endif 492 { 493 for (mifi = 0; mifi < nummifs; mifi++) { 494 if (mif6table[mifi].m6_ifp && 495 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 496 ifr.ifr_addr.sin6_family = AF_INET6; 497 ifr.ifr_addr.sin6_addr= in6addr_any; 498 ifp = mif6table[mifi].m6_ifp; 499 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 500 (caddr_t)&ifr); 501 } 502 } 503 } 504 #ifdef notyet 505 bzero((caddr_t)qtable, sizeof(qtable)); 506 bzero((caddr_t)tbftable, sizeof(tbftable)); 507 #endif 508 bzero((caddr_t)mif6table, sizeof(mif6table)); 509 nummifs = 0; 510 511 pim6 = 0; /* used to stub out/in pim specific code */ 512 513 callout_stop(&expire_upcalls_ch); 514 515 /* 516 * Free all multicast forwarding cache entries. 517 */ 518 for (i = 0; i < MF6CTBLSIZ; i++) { 519 rt = mf6ctable[i]; 520 while (rt) { 521 struct mf6c *frt; 522 523 for (rte = rt->mf6c_stall; rte != NULL; ) { 524 struct rtdetq *n = rte->next; 525 526 m_free(rte->m); 527 free(rte, M_MRTABLE); 528 rte = n; 529 } 530 frt = rt; 531 rt = rt->mf6c_next; 532 free(frt, M_MRTABLE); 533 } 534 } 535 536 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 537 538 /* 539 * Reset de-encapsulation cache 540 */ 541 reg_mif_num = -1; 542 543 ip6_mrouter = NULL; 544 ip6_mrouter_ver = 0; 545 546 splx(s); 547 548 #ifdef MRT6DEBUG 549 if (mrt6debug) 550 log(LOG_DEBUG, "ip6_mrouter_done\n"); 551 #endif 552 553 return 0; 554 } 555 556 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 557 558 /* 559 * Add a mif to the mif table 560 */ 561 static int 562 add_m6if(mifcp) 563 struct mif6ctl *mifcp; 564 { 565 struct mif6 *mifp; 566 struct ifnet *ifp; 567 struct in6_ifreq ifr; 568 int error, s; 569 #ifdef notyet 570 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 571 #endif 572 573 if (mifcp->mif6c_mifi >= MAXMIFS) 574 return EINVAL; 575 mifp = mif6table + mifcp->mif6c_mifi; 576 if (mifp->m6_ifp) 577 return EADDRINUSE; /* XXX: is it appropriate? */ 578 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 579 return ENXIO; 580 /* 581 * XXX: some OSes can remove ifp and clear ifindex2ifnet[id] 582 * even for id between 0 and if_index. 583 */ 584 if ((ifp = ifindex2ifnet[mifcp->mif6c_pifi]) == NULL) 585 return ENXIO; 586 587 if (mifcp->mif6c_flags & MIFF_REGISTER) { 588 if (reg_mif_num == (mifi_t)-1) { 589 strcpy(multicast_register_if.if_xname, 590 "register_mif"); /* XXX */ 591 multicast_register_if.if_flags |= IFF_LOOPBACK; 592 multicast_register_if.if_index = mifcp->mif6c_mifi; 593 reg_mif_num = mifcp->mif6c_mifi; 594 } 595 596 ifp = &multicast_register_if; 597 598 } /* if REGISTER */ 599 else { 600 /* Make sure the interface supports multicast */ 601 if ((ifp->if_flags & IFF_MULTICAST) == 0) 602 return EOPNOTSUPP; 603 604 s = splsoftnet(); 605 /* 606 * Enable promiscuous reception of all IPv6 multicasts 607 * from the interface. 608 */ 609 ifr.ifr_addr.sin6_family = AF_INET6; 610 ifr.ifr_addr.sin6_addr = in6addr_any; 611 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 612 splx(s); 613 if (error) 614 return error; 615 } 616 617 s = splsoftnet(); 618 mifp->m6_flags = mifcp->mif6c_flags; 619 mifp->m6_ifp = ifp; 620 #ifdef notyet 621 /* scaling up here allows division by 1024 in critical code */ 622 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 623 #endif 624 /* initialize per mif pkt counters */ 625 mifp->m6_pkt_in = 0; 626 mifp->m6_pkt_out = 0; 627 mifp->m6_bytes_in = 0; 628 mifp->m6_bytes_out = 0; 629 splx(s); 630 631 /* Adjust nummifs up if the mifi is higher than nummifs */ 632 if (nummifs <= mifcp->mif6c_mifi) 633 nummifs = mifcp->mif6c_mifi + 1; 634 635 #ifdef MRT6DEBUG 636 if (mrt6debug) 637 log(LOG_DEBUG, 638 "add_mif #%d, phyint %s%d\n", 639 mifcp->mif6c_mifi, 640 ifp->if_name, ifp->if_unit); 641 #endif 642 643 return 0; 644 } 645 646 /* 647 * Delete a mif from the mif table 648 */ 649 static int 650 del_m6if(mifip) 651 mifi_t *mifip; 652 { 653 struct mif6 *mifp = mif6table + *mifip; 654 mifi_t mifi; 655 struct ifnet *ifp; 656 struct in6_ifreq ifr; 657 int s; 658 659 if (*mifip >= nummifs) 660 return EINVAL; 661 if (mifp->m6_ifp == NULL) 662 return EINVAL; 663 664 s = splsoftnet(); 665 666 if (!(mifp->m6_flags & MIFF_REGISTER)) { 667 /* 668 * XXX: what if there is yet IPv4 multicast daemon 669 * using the interface? 670 */ 671 ifp = mifp->m6_ifp; 672 673 ifr.ifr_addr.sin6_family = AF_INET6; 674 ifr.ifr_addr.sin6_addr = in6addr_any; 675 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 676 } 677 678 #ifdef notyet 679 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 680 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 681 #endif 682 bzero((caddr_t)mifp, sizeof (*mifp)); 683 684 /* Adjust nummifs down */ 685 for (mifi = nummifs; mifi > 0; mifi--) 686 if (mif6table[mifi - 1].m6_ifp) 687 break; 688 nummifs = mifi; 689 690 splx(s); 691 692 #ifdef MRT6DEBUG 693 if (mrt6debug) 694 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 695 #endif 696 697 return 0; 698 } 699 700 /* 701 * Add an mfc entry 702 */ 703 static int 704 add_m6fc(mfccp) 705 struct mf6cctl *mfccp; 706 { 707 struct mf6c *rt; 708 u_long hash; 709 struct rtdetq *rte; 710 u_short nstl; 711 int s; 712 713 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 714 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 715 716 /* If an entry already exists, just update the fields */ 717 if (rt) { 718 #ifdef MRT6DEBUG 719 if (mrt6debug & DEBUG_MFC) 720 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 721 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 722 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 723 mfccp->mf6cc_parent); 724 #endif 725 726 s = splsoftnet(); 727 rt->mf6c_parent = mfccp->mf6cc_parent; 728 rt->mf6c_ifset = mfccp->mf6cc_ifset; 729 splx(s); 730 return 0; 731 } 732 733 /* 734 * Find the entry for which the upcall was made and update 735 */ 736 s = splsoftnet(); 737 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 738 mfccp->mf6cc_mcastgrp.sin6_addr); 739 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 740 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 741 &mfccp->mf6cc_origin.sin6_addr) && 742 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 743 &mfccp->mf6cc_mcastgrp.sin6_addr) && 744 (rt->mf6c_stall != NULL)) { 745 746 if (nstl++) 747 log(LOG_ERR, 748 "add_m6fc: %s o %s g %s p %x dbx %p\n", 749 "multiple kernel entries", 750 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 751 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 752 mfccp->mf6cc_parent, rt->mf6c_stall); 753 754 #ifdef MRT6DEBUG 755 if (mrt6debug & DEBUG_MFC) 756 log(LOG_DEBUG, 757 "add_m6fc o %s g %s p %x dbg %x\n", 758 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 759 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 760 mfccp->mf6cc_parent, rt->mf6c_stall); 761 #endif 762 763 rt->mf6c_origin = mfccp->mf6cc_origin; 764 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 765 rt->mf6c_parent = mfccp->mf6cc_parent; 766 rt->mf6c_ifset = mfccp->mf6cc_ifset; 767 /* initialize pkt counters per src-grp */ 768 rt->mf6c_pkt_cnt = 0; 769 rt->mf6c_byte_cnt = 0; 770 rt->mf6c_wrong_if = 0; 771 772 rt->mf6c_expire = 0; /* Don't clean this guy up */ 773 n6expire[hash]--; 774 775 /* free packets Qed at the end of this entry */ 776 for (rte = rt->mf6c_stall; rte != NULL; ) { 777 struct rtdetq *n = rte->next; 778 ip6_mdq(rte->m, rte->ifp, rt); 779 m_freem(rte->m); 780 #ifdef UPCALL_TIMING 781 collate(&(rte->t)); 782 #endif /* UPCALL_TIMING */ 783 free(rte, M_MRTABLE); 784 rte = n; 785 } 786 rt->mf6c_stall = NULL; 787 } 788 } 789 790 /* 791 * It is possible that an entry is being inserted without an upcall 792 */ 793 if (nstl == 0) { 794 #ifdef MRT6DEBUG 795 if (mrt6debug & DEBUG_MFC) 796 log(LOG_DEBUG, 797 "add_mfc no upcall h %d o %s g %s p %x\n", 798 hash, 799 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 800 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 801 mfccp->mf6cc_parent); 802 #endif 803 804 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 805 806 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 807 &mfccp->mf6cc_origin.sin6_addr)&& 808 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 809 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 810 811 rt->mf6c_origin = mfccp->mf6cc_origin; 812 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 813 rt->mf6c_parent = mfccp->mf6cc_parent; 814 rt->mf6c_ifset = mfccp->mf6cc_ifset; 815 /* initialize pkt counters per src-grp */ 816 rt->mf6c_pkt_cnt = 0; 817 rt->mf6c_byte_cnt = 0; 818 rt->mf6c_wrong_if = 0; 819 820 if (rt->mf6c_expire) 821 n6expire[hash]--; 822 rt->mf6c_expire = 0; 823 } 824 } 825 if (rt == NULL) { 826 /* no upcall, so make a new entry */ 827 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 828 M_NOWAIT); 829 if (rt == NULL) { 830 splx(s); 831 return ENOBUFS; 832 } 833 834 /* insert new entry at head of hash chain */ 835 rt->mf6c_origin = mfccp->mf6cc_origin; 836 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 837 rt->mf6c_parent = mfccp->mf6cc_parent; 838 rt->mf6c_ifset = mfccp->mf6cc_ifset; 839 /* initialize pkt counters per src-grp */ 840 rt->mf6c_pkt_cnt = 0; 841 rt->mf6c_byte_cnt = 0; 842 rt->mf6c_wrong_if = 0; 843 rt->mf6c_expire = 0; 844 rt->mf6c_stall = NULL; 845 846 /* link into table */ 847 rt->mf6c_next = mf6ctable[hash]; 848 mf6ctable[hash] = rt; 849 } 850 } 851 splx(s); 852 return 0; 853 } 854 855 #ifdef UPCALL_TIMING 856 /* 857 * collect delay statistics on the upcalls 858 */ 859 static void 860 collate(t) 861 struct timeval *t; 862 { 863 u_long d; 864 struct timeval tp; 865 u_long delta; 866 867 GET_TIME(tp); 868 869 if (TV_LT(*t, tp)) 870 { 871 TV_DELTA(tp, *t, delta); 872 873 d = delta >> 10; 874 if (d > UPCALL_MAX) 875 d = UPCALL_MAX; 876 877 ++upcall_data[d]; 878 } 879 } 880 #endif /* UPCALL_TIMING */ 881 882 /* 883 * Delete an mfc entry 884 */ 885 static int 886 del_m6fc(mfccp) 887 struct mf6cctl *mfccp; 888 { 889 struct sockaddr_in6 origin; 890 struct sockaddr_in6 mcastgrp; 891 struct mf6c *rt; 892 struct mf6c **nptr; 893 u_long hash; 894 int s; 895 896 origin = mfccp->mf6cc_origin; 897 mcastgrp = mfccp->mf6cc_mcastgrp; 898 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 899 900 #ifdef MRT6DEBUG 901 if (mrt6debug & DEBUG_MFC) 902 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 903 ip6_sprintf(&origin.sin6_addr), 904 ip6_sprintf(&mcastgrp.sin6_addr)); 905 #endif 906 907 s = splsoftnet(); 908 909 nptr = &mf6ctable[hash]; 910 while ((rt = *nptr) != NULL) { 911 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 912 &rt->mf6c_origin.sin6_addr) && 913 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 914 &rt->mf6c_mcastgrp.sin6_addr) && 915 rt->mf6c_stall == NULL) 916 break; 917 918 nptr = &rt->mf6c_next; 919 } 920 if (rt == NULL) { 921 splx(s); 922 return EADDRNOTAVAIL; 923 } 924 925 *nptr = rt->mf6c_next; 926 free(rt, M_MRTABLE); 927 928 splx(s); 929 930 return 0; 931 } 932 933 static int 934 socket_send(s, mm, src) 935 struct socket *s; 936 struct mbuf *mm; 937 struct sockaddr_in6 *src; 938 { 939 if (s) { 940 if (sbappendaddr(&s->so_rcv, 941 (struct sockaddr *)src, 942 mm, (struct mbuf *)0) != 0) { 943 sorwakeup(s); 944 return 0; 945 } 946 } 947 m_freem(mm); 948 return -1; 949 } 950 951 /* 952 * IPv6 multicast forwarding function. This function assumes that the packet 953 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 954 * pointed to by "ifp", and the packet is to be relayed to other networks 955 * that have members of the packet's destination IPv6 multicast group. 956 * 957 * The packet is returned unscathed to the caller, unless it is 958 * erroneous, in which case a non-zero return value tells the caller to 959 * discard it. 960 */ 961 962 int 963 ip6_mforward(ip6, ifp, m) 964 struct ip6_hdr *ip6; 965 struct ifnet *ifp; 966 struct mbuf *m; 967 { 968 struct mf6c *rt; 969 struct mif6 *mifp; 970 struct mbuf *mm; 971 int s; 972 mifi_t mifi; 973 long time_second = time.tv_sec; 974 975 #ifdef MRT6DEBUG 976 if (mrt6debug & DEBUG_FORWARD) 977 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 978 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 979 ifp->if_index); 980 #endif 981 982 /* 983 * Don't forward a packet with Hop limit of zero or one, 984 * or a packet destined to a local-only group. 985 */ 986 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 987 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 988 return 0; 989 ip6->ip6_hlim--; 990 991 /* 992 * Source address check: do not forward packets with unspecified 993 * source. It was discussed in July 2000, on ipngwg mailing list. 994 * This is rather more serious than unicast cases, because some 995 * MLD packets can be sent with the unspecified source address 996 * (although such packets must normally set 1 to the hop limit field). 997 */ 998 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 999 ip6stat.ip6s_cantforward++; 1000 if (ip6_log_time + ip6_log_interval < time_second) { 1001 ip6_log_time = time_second; 1002 log(LOG_DEBUG, 1003 "cannot forward " 1004 "from %s to %s nxt %d received on %s\n", 1005 ip6_sprintf(&ip6->ip6_src), 1006 ip6_sprintf(&ip6->ip6_dst), 1007 ip6->ip6_nxt, 1008 m->m_pkthdr.rcvif ? 1009 if_name(m->m_pkthdr.rcvif) : "?"); 1010 } 1011 return 0; 1012 } 1013 1014 /* 1015 * Determine forwarding mifs from the forwarding cache table 1016 */ 1017 s = splsoftnet(); 1018 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1019 1020 /* Entry exists, so forward if necessary */ 1021 if (rt) { 1022 splx(s); 1023 return (ip6_mdq(m, ifp, rt)); 1024 } else { 1025 /* 1026 * If we don't have a route for packet's origin, 1027 * Make a copy of the packet & 1028 * send message to routing daemon 1029 */ 1030 1031 struct mbuf *mb0; 1032 struct rtdetq *rte; 1033 u_long hash; 1034 /* int i, npkts;*/ 1035 #ifdef UPCALL_TIMING 1036 struct timeval tp; 1037 1038 GET_TIME(tp); 1039 #endif /* UPCALL_TIMING */ 1040 1041 mrt6stat.mrt6s_no_route++; 1042 #ifdef MRT6DEBUG 1043 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1044 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1045 ip6_sprintf(&ip6->ip6_src), 1046 ip6_sprintf(&ip6->ip6_dst)); 1047 #endif 1048 1049 /* 1050 * Allocate mbufs early so that we don't do extra work if we 1051 * are just going to fail anyway. 1052 */ 1053 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1054 M_NOWAIT); 1055 if (rte == NULL) { 1056 splx(s); 1057 return ENOBUFS; 1058 } 1059 mb0 = m_copy(m, 0, M_COPYALL); 1060 /* 1061 * Pullup packet header if needed before storing it, 1062 * as other references may modify it in the meantime. 1063 */ 1064 if (mb0 && 1065 (M_READONLY(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1066 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1067 if (mb0 == NULL) { 1068 free(rte, M_MRTABLE); 1069 splx(s); 1070 return ENOBUFS; 1071 } 1072 1073 /* is there an upcall waiting for this packet? */ 1074 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1075 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1076 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1077 &rt->mf6c_origin.sin6_addr) && 1078 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1079 &rt->mf6c_mcastgrp.sin6_addr) && 1080 (rt->mf6c_stall != NULL)) 1081 break; 1082 } 1083 1084 if (rt == NULL) { 1085 struct mrt6msg *im; 1086 struct omrt6msg *oim; 1087 1088 /* no upcall, so make a new entry */ 1089 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1090 M_NOWAIT); 1091 if (rt == NULL) { 1092 free(rte, M_MRTABLE); 1093 m_freem(mb0); 1094 splx(s); 1095 return ENOBUFS; 1096 } 1097 /* 1098 * Make a copy of the header to send to the user 1099 * level process 1100 */ 1101 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1102 1103 if (mm == NULL) { 1104 free(rte, M_MRTABLE); 1105 m_freem(mb0); 1106 free(rt, M_MRTABLE); 1107 splx(s); 1108 return ENOBUFS; 1109 } 1110 1111 /* 1112 * Send message to routing daemon 1113 */ 1114 sin6.sin6_addr = ip6->ip6_src; 1115 1116 im = NULL; 1117 oim = NULL; 1118 switch (ip6_mrouter_ver) { 1119 case MRT6_OINIT: 1120 oim = mtod(mm, struct omrt6msg *); 1121 oim->im6_msgtype = MRT6MSG_NOCACHE; 1122 oim->im6_mbz = 0; 1123 break; 1124 case MRT6_INIT: 1125 im = mtod(mm, struct mrt6msg *); 1126 im->im6_msgtype = MRT6MSG_NOCACHE; 1127 im->im6_mbz = 0; 1128 break; 1129 default: 1130 free(rte, M_MRTABLE); 1131 m_freem(mb0); 1132 free(rt, M_MRTABLE); 1133 splx(s); 1134 return EINVAL; 1135 } 1136 1137 #ifdef MRT6DEBUG 1138 if (mrt6debug & DEBUG_FORWARD) 1139 log(LOG_DEBUG, 1140 "getting the iif info in the kernel\n"); 1141 #endif 1142 1143 for (mifp = mif6table, mifi = 0; 1144 mifi < nummifs && mifp->m6_ifp != ifp; 1145 mifp++, mifi++) 1146 ; 1147 1148 switch (ip6_mrouter_ver) { 1149 case MRT6_OINIT: 1150 oim->im6_mif = mifi; 1151 break; 1152 case MRT6_INIT: 1153 im->im6_mif = mifi; 1154 break; 1155 } 1156 1157 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1158 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1159 "socket queue full\n"); 1160 mrt6stat.mrt6s_upq_sockfull++; 1161 free(rte, M_MRTABLE); 1162 m_freem(mb0); 1163 free(rt, M_MRTABLE); 1164 splx(s); 1165 return ENOBUFS; 1166 } 1167 1168 mrt6stat.mrt6s_upcalls++; 1169 1170 /* insert new entry at head of hash chain */ 1171 bzero(rt, sizeof(*rt)); 1172 rt->mf6c_origin.sin6_family = AF_INET6; 1173 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1174 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1175 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1176 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1177 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1178 rt->mf6c_expire = UPCALL_EXPIRE; 1179 n6expire[hash]++; 1180 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1181 1182 /* link into table */ 1183 rt->mf6c_next = mf6ctable[hash]; 1184 mf6ctable[hash] = rt; 1185 /* Add this entry to the end of the queue */ 1186 rt->mf6c_stall = rte; 1187 } else { 1188 /* determine if q has overflowed */ 1189 struct rtdetq **p; 1190 int npkts = 0; 1191 1192 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1193 if (++npkts > MAX_UPQ6) { 1194 mrt6stat.mrt6s_upq_ovflw++; 1195 free(rte, M_MRTABLE); 1196 m_freem(mb0); 1197 splx(s); 1198 return 0; 1199 } 1200 1201 /* Add this entry to the end of the queue */ 1202 *p = rte; 1203 } 1204 1205 rte->next = NULL; 1206 rte->m = mb0; 1207 rte->ifp = ifp; 1208 #ifdef UPCALL_TIMING 1209 rte->t = tp; 1210 #endif /* UPCALL_TIMING */ 1211 1212 splx(s); 1213 1214 return 0; 1215 } 1216 } 1217 1218 /* 1219 * Clean up cache entries if upcalls are not serviced 1220 * Call from the Slow Timeout mechanism, every half second. 1221 */ 1222 static void 1223 expire_upcalls(unused) 1224 void *unused; 1225 { 1226 struct rtdetq *rte; 1227 struct mf6c *mfc, **nptr; 1228 int i; 1229 int s; 1230 1231 s = splsoftnet(); 1232 for (i = 0; i < MF6CTBLSIZ; i++) { 1233 if (n6expire[i] == 0) 1234 continue; 1235 nptr = &mf6ctable[i]; 1236 while ((mfc = *nptr) != NULL) { 1237 rte = mfc->mf6c_stall; 1238 /* 1239 * Skip real cache entries 1240 * Make sure it wasn't marked to not expire (shouldn't happen) 1241 * If it expires now 1242 */ 1243 if (rte != NULL && 1244 mfc->mf6c_expire != 0 && 1245 --mfc->mf6c_expire == 0) { 1246 #ifdef MRT6DEBUG 1247 if (mrt6debug & DEBUG_EXPIRE) 1248 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1249 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1250 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1251 #endif 1252 /* 1253 * drop all the packets 1254 * free the mbuf with the pkt, if, timing info 1255 */ 1256 do { 1257 struct rtdetq *n = rte->next; 1258 m_freem(rte->m); 1259 free(rte, M_MRTABLE); 1260 rte = n; 1261 } while (rte != NULL); 1262 mrt6stat.mrt6s_cache_cleanups++; 1263 n6expire[i]--; 1264 1265 *nptr = mfc->mf6c_next; 1266 free(mfc, M_MRTABLE); 1267 } else { 1268 nptr = &mfc->mf6c_next; 1269 } 1270 } 1271 } 1272 splx(s); 1273 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1274 expire_upcalls, NULL); 1275 } 1276 1277 /* 1278 * Packet forwarding routine once entry in the cache is made 1279 */ 1280 static int 1281 ip6_mdq(m, ifp, rt) 1282 struct mbuf *m; 1283 struct ifnet *ifp; 1284 struct mf6c *rt; 1285 { 1286 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1287 mifi_t mifi, iif; 1288 struct mif6 *mifp; 1289 int plen = m->m_pkthdr.len; 1290 1291 /* 1292 * Macro to send packet on mif. Since RSVP packets don't get counted on 1293 * input, they shouldn't get counted on output, so statistics keeping is 1294 * separate. 1295 */ 1296 1297 #define MC6_SEND(ip6, mifp, m) do { \ 1298 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1299 register_send((ip6), (mifp), (m)); \ 1300 else \ 1301 phyint_send((ip6), (mifp), (m)); \ 1302 } while (/*CONSTCOND*/ 0) 1303 1304 /* 1305 * Don't forward if it didn't arrive from the parent mif 1306 * for its origin. 1307 */ 1308 mifi = rt->mf6c_parent; 1309 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1310 /* came in the wrong interface */ 1311 #ifdef MRT6DEBUG 1312 if (mrt6debug & DEBUG_FORWARD) 1313 log(LOG_DEBUG, 1314 "wrong if: ifid %d mifi %d mififid %x\n", 1315 ifp->if_index, mifi, 1316 mif6table[mifi].m6_ifp->if_index); 1317 #endif 1318 mrt6stat.mrt6s_wrong_if++; 1319 rt->mf6c_wrong_if++; 1320 /* 1321 * If we are doing PIM processing, and we are forwarding 1322 * packets on this interface, send a message to the 1323 * routing daemon. 1324 */ 1325 /* have to make sure this is a valid mif */ 1326 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1327 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1328 /* 1329 * Check the M_LOOP flag to avoid an 1330 * unnecessary PIM assert. 1331 * XXX: M_LOOP is an ad-hoc hack... 1332 */ 1333 static struct sockaddr_in6 sin6 = 1334 { sizeof(sin6), AF_INET6 }; 1335 1336 struct mbuf *mm; 1337 struct mrt6msg *im; 1338 struct omrt6msg *oim; 1339 1340 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1341 if (mm && 1342 (M_READONLY(mm) || 1343 mm->m_len < sizeof(struct ip6_hdr))) 1344 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1345 if (mm == NULL) 1346 return ENOBUFS; 1347 1348 oim = NULL; 1349 im = NULL; 1350 switch (ip6_mrouter_ver) { 1351 case MRT6_OINIT: 1352 oim = mtod(mm, struct omrt6msg *); 1353 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1354 oim->im6_mbz = 0; 1355 break; 1356 case MRT6_INIT: 1357 im = mtod(mm, struct mrt6msg *); 1358 im->im6_msgtype = MRT6MSG_WRONGMIF; 1359 im->im6_mbz = 0; 1360 break; 1361 default: 1362 m_freem(mm); 1363 return EINVAL; 1364 } 1365 1366 for (mifp = mif6table, iif = 0; 1367 iif < nummifs && mifp && 1368 mifp->m6_ifp != ifp; 1369 mifp++, iif++) 1370 ; 1371 1372 switch (ip6_mrouter_ver) { 1373 case MRT6_OINIT: 1374 oim->im6_mif = iif; 1375 sin6.sin6_addr = oim->im6_src; 1376 break; 1377 case MRT6_INIT: 1378 im->im6_mif = iif; 1379 sin6.sin6_addr = im->im6_src; 1380 break; 1381 } 1382 1383 mrt6stat.mrt6s_upcalls++; 1384 1385 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1386 #ifdef MRT6DEBUG 1387 if (mrt6debug) 1388 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1389 #endif 1390 ++mrt6stat.mrt6s_upq_sockfull; 1391 return ENOBUFS; 1392 } /* if socket Q full */ 1393 } /* if PIM */ 1394 return 0; 1395 } /* if wrong iif */ 1396 1397 /* If I sourced this packet, it counts as output, else it was input. */ 1398 if (m->m_pkthdr.rcvif == NULL) { 1399 /* XXX: is rcvif really NULL when output?? */ 1400 mif6table[mifi].m6_pkt_out++; 1401 mif6table[mifi].m6_bytes_out += plen; 1402 } else { 1403 mif6table[mifi].m6_pkt_in++; 1404 mif6table[mifi].m6_bytes_in += plen; 1405 } 1406 rt->mf6c_pkt_cnt++; 1407 rt->mf6c_byte_cnt += plen; 1408 1409 /* 1410 * For each mif, forward a copy of the packet if there are group 1411 * members downstream on the interface. 1412 */ 1413 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1414 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1415 #ifdef notyet 1416 /* 1417 * check if the outgoing packet is going to break 1418 * a scope boundary. 1419 * XXX For packets through PIM register tunnel 1420 * interface, we believe a routing daemon. 1421 */ 1422 if ((mif6table[rt->mf6c_parent].m6_flags & 1423 MIFF_REGISTER) == 0 && 1424 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1425 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1426 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1427 &ip6->ip6_dst) || 1428 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1429 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1430 &ip6->ip6_src))) { 1431 ip6stat.ip6s_badscope++; 1432 continue; 1433 } 1434 #endif 1435 1436 mifp->m6_pkt_out++; 1437 mifp->m6_bytes_out += plen; 1438 MC6_SEND(ip6, mifp, m); 1439 } 1440 return 0; 1441 } 1442 1443 static void 1444 phyint_send(ip6, mifp, m) 1445 struct ip6_hdr *ip6; 1446 struct mif6 *mifp; 1447 struct mbuf *m; 1448 { 1449 struct mbuf *mb_copy; 1450 struct ifnet *ifp = mifp->m6_ifp; 1451 int error = 0; 1452 int s = splsoftnet(); 1453 static struct route_in6 ro; 1454 struct in6_multi *in6m; 1455 struct sockaddr_in6 *dst6; 1456 u_long linkmtu; 1457 1458 /* 1459 * Make a new reference to the packet; make sure that 1460 * the IPv6 header is actually copied, not just referenced, 1461 * so that ip6_output() only scribbles on the copy. 1462 */ 1463 mb_copy = m_copy(m, 0, M_COPYALL); 1464 if (mb_copy && 1465 (M_READONLY(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1466 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1467 if (mb_copy == NULL) { 1468 splx(s); 1469 return; 1470 } 1471 /* set MCAST flag to the outgoing packet */ 1472 mb_copy->m_flags |= M_MCAST; 1473 1474 /* 1475 * If we sourced the packet, call ip6_output since we may devide 1476 * the packet into fragments when the packet is too big for the 1477 * outgoing interface. 1478 * Otherwise, we can simply send the packet to the interface 1479 * sending queue. 1480 */ 1481 if (m->m_pkthdr.rcvif == NULL) { 1482 struct ip6_moptions im6o; 1483 1484 im6o.im6o_multicast_ifp = ifp; 1485 /* XXX: ip6_output will override ip6->ip6_hlim */ 1486 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1487 im6o.im6o_multicast_loop = 1; 1488 error = ip6_output(mb_copy, NULL, &ro, 1489 IPV6_FORWARDING, &im6o, NULL); 1490 1491 #ifdef MRT6DEBUG 1492 if (mrt6debug & DEBUG_XMIT) 1493 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1494 mifp - mif6table, error); 1495 #endif 1496 splx(s); 1497 return; 1498 } 1499 1500 /* 1501 * If we belong to the destination multicast group 1502 * on the outgoing interface, loop back a copy. 1503 */ 1504 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1505 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1506 if (in6m != NULL) { 1507 dst6->sin6_len = sizeof(struct sockaddr_in6); 1508 dst6->sin6_family = AF_INET6; 1509 dst6->sin6_addr = ip6->ip6_dst; 1510 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1511 } 1512 /* 1513 * Put the packet into the sending queue of the outgoing interface 1514 * if it would fit in the MTU of the interface. 1515 */ 1516 linkmtu = IN6_LINKMTU(ifp); 1517 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1518 dst6->sin6_len = sizeof(struct sockaddr_in6); 1519 dst6->sin6_family = AF_INET6; 1520 dst6->sin6_addr = ip6->ip6_dst; 1521 /* 1522 * We just call if_output instead of nd6_output here, since 1523 * we need no ND for a multicast forwarded packet...right? 1524 */ 1525 error = (*ifp->if_output)(ifp, mb_copy, 1526 (struct sockaddr *)&ro.ro_dst, NULL); 1527 #ifdef MRT6DEBUG 1528 if (mrt6debug & DEBUG_XMIT) 1529 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1530 mifp - mif6table, error); 1531 #endif 1532 } else { 1533 #ifdef MULTICAST_PMTUD 1534 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1535 #else 1536 #ifdef MRT6DEBUG 1537 if (mrt6debug & DEBUG_XMIT) 1538 log(LOG_DEBUG, 1539 "phyint_send: packet too big on %s o %s g %s" 1540 " size %d(discarded)\n", 1541 if_name(ifp), 1542 ip6_sprintf(&ip6->ip6_src), 1543 ip6_sprintf(&ip6->ip6_dst), 1544 mb_copy->m_pkthdr.len); 1545 #endif /* MRT6DEBUG */ 1546 m_freem(mb_copy); /* simply discard the packet */ 1547 #endif 1548 } 1549 1550 splx(s); 1551 } 1552 1553 static int 1554 register_send(ip6, mif, m) 1555 struct ip6_hdr *ip6; 1556 struct mif6 *mif; 1557 struct mbuf *m; 1558 { 1559 struct mbuf *mm; 1560 int i, len = m->m_pkthdr.len; 1561 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1562 struct mrt6msg *im6; 1563 1564 #ifdef MRT6DEBUG 1565 if (mrt6debug) 1566 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1567 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1568 #endif 1569 ++pim6stat.pim6s_snd_registers; 1570 1571 /* Make a copy of the packet to send to the user level process */ 1572 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1573 if (mm == NULL) 1574 return ENOBUFS; 1575 mm->m_data += max_linkhdr; 1576 mm->m_len = sizeof(struct ip6_hdr); 1577 1578 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1579 m_freem(mm); 1580 return ENOBUFS; 1581 } 1582 i = MHLEN - M_LEADINGSPACE(mm); 1583 if (i > len) 1584 i = len; 1585 mm = m_pullup(mm, i); 1586 if (mm == NULL) 1587 return ENOBUFS; 1588 /* TODO: check it! */ 1589 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1590 1591 /* 1592 * Send message to routing daemon 1593 */ 1594 sin6.sin6_addr = ip6->ip6_src; 1595 1596 im6 = mtod(mm, struct mrt6msg *); 1597 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1598 im6->im6_mbz = 0; 1599 1600 im6->im6_mif = mif - mif6table; 1601 1602 /* iif info is not given for reg. encap.n */ 1603 mrt6stat.mrt6s_upcalls++; 1604 1605 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1606 #ifdef MRT6DEBUG 1607 if (mrt6debug) 1608 log(LOG_WARNING, 1609 "register_send: ip6_mrouter socket queue full\n"); 1610 #endif 1611 ++mrt6stat.mrt6s_upq_sockfull; 1612 return ENOBUFS; 1613 } 1614 return 0; 1615 } 1616 1617 /* 1618 * PIM sparse mode hook 1619 * Receives the pim control messages, and passes them up to the listening 1620 * socket, using rip6_input. 1621 * The only message processed is the REGISTER pim message; the pim header 1622 * is stripped off, and the inner packet is passed to register_mforward. 1623 */ 1624 int 1625 pim6_input(mp, offp, proto) 1626 struct mbuf **mp; 1627 int *offp, proto; 1628 { 1629 struct pim *pim; /* pointer to a pim struct */ 1630 struct ip6_hdr *ip6; 1631 int pimlen; 1632 struct mbuf *m = *mp; 1633 int minlen; 1634 int off = *offp; 1635 1636 ++pim6stat.pim6s_rcv_total; 1637 1638 ip6 = mtod(m, struct ip6_hdr *); 1639 pimlen = m->m_pkthdr.len - *offp; 1640 1641 /* 1642 * Validate lengths 1643 */ 1644 if (pimlen < PIM_MINLEN) { 1645 ++pim6stat.pim6s_rcv_tooshort; 1646 #ifdef MRT6DEBUG 1647 if (mrt6debug & DEBUG_PIM) 1648 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1649 #endif 1650 m_freem(m); 1651 return (IPPROTO_DONE); 1652 } 1653 1654 /* 1655 * if the packet is at least as big as a REGISTER, go ahead 1656 * and grab the PIM REGISTER header size, to avoid another 1657 * possible m_pullup() later. 1658 * 1659 * PIM_MINLEN == pimhdr + u_int32 == 8 1660 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1661 */ 1662 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1663 1664 /* 1665 * Make sure that the IP6 and PIM headers in contiguous memory, and 1666 * possibly the PIM REGISTER header 1667 */ 1668 #ifndef PULLDOWN_TEST 1669 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1670 /* adjust pointer */ 1671 ip6 = mtod(m, struct ip6_hdr *); 1672 1673 /* adjust mbuf to point to the PIM header */ 1674 pim = (struct pim *)((caddr_t)ip6 + off); 1675 #else 1676 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1677 if (pim == NULL) { 1678 pim6stat.pim6s_rcv_tooshort++; 1679 return IPPROTO_DONE; 1680 } 1681 #endif 1682 1683 #define PIM6_CHECKSUM 1684 #ifdef PIM6_CHECKSUM 1685 { 1686 int cksumlen; 1687 1688 /* 1689 * Validate checksum. 1690 * If PIM REGISTER, exclude the data packet 1691 */ 1692 if (pim->pim_type == PIM_REGISTER) 1693 cksumlen = PIM_MINLEN; 1694 else 1695 cksumlen = pimlen; 1696 1697 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1698 ++pim6stat.pim6s_rcv_badsum; 1699 #ifdef MRT6DEBUG 1700 if (mrt6debug & DEBUG_PIM) 1701 log(LOG_DEBUG, 1702 "pim6_input: invalid checksum\n"); 1703 #endif 1704 m_freem(m); 1705 return (IPPROTO_DONE); 1706 } 1707 } 1708 #endif /* PIM_CHECKSUM */ 1709 1710 /* PIM version check */ 1711 if (pim->pim_ver != PIM_VERSION) { 1712 ++pim6stat.pim6s_rcv_badversion; 1713 #ifdef MRT6DEBUG 1714 log(LOG_ERR, 1715 "pim6_input: incorrect version %d, expecting %d\n", 1716 pim->pim_ver, PIM_VERSION); 1717 #endif 1718 m_freem(m); 1719 return (IPPROTO_DONE); 1720 } 1721 1722 if (pim->pim_type == PIM_REGISTER) { 1723 /* 1724 * since this is a REGISTER, we'll make a copy of the register 1725 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1726 * routing daemon. 1727 */ 1728 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1729 1730 struct mbuf *mcp; 1731 struct ip6_hdr *eip6; 1732 u_int32_t *reghdr; 1733 int rc; 1734 1735 ++pim6stat.pim6s_rcv_registers; 1736 1737 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1738 #ifdef MRT6DEBUG 1739 if (mrt6debug & DEBUG_PIM) 1740 log(LOG_DEBUG, 1741 "pim6_input: register mif not set: %d\n", 1742 reg_mif_num); 1743 #endif 1744 m_freem(m); 1745 return (IPPROTO_DONE); 1746 } 1747 1748 reghdr = (u_int32_t *)(pim + 1); 1749 1750 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1751 goto pim6_input_to_daemon; 1752 1753 /* 1754 * Validate length 1755 */ 1756 if (pimlen < PIM6_REG_MINLEN) { 1757 ++pim6stat.pim6s_rcv_tooshort; 1758 ++pim6stat.pim6s_rcv_badregisters; 1759 #ifdef MRT6DEBUG 1760 log(LOG_ERR, 1761 "pim6_input: register packet size too " 1762 "small %d from %s\n", 1763 pimlen, ip6_sprintf(&ip6->ip6_src)); 1764 #endif 1765 m_freem(m); 1766 return (IPPROTO_DONE); 1767 } 1768 1769 eip6 = (struct ip6_hdr *) (reghdr + 1); 1770 #ifdef MRT6DEBUG 1771 if (mrt6debug & DEBUG_PIM) 1772 log(LOG_DEBUG, 1773 "pim6_input[register], eip6: %s -> %s, " 1774 "eip6 plen %d\n", 1775 ip6_sprintf(&eip6->ip6_src), 1776 ip6_sprintf(&eip6->ip6_dst), 1777 ntohs(eip6->ip6_plen)); 1778 #endif 1779 1780 /* verify the version number of the inner packet */ 1781 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1782 ++pim6stat.pim6s_rcv_badregisters; 1783 #ifdef MRT6DEBUG 1784 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1785 "of the inner packet\n", 1786 (eip6->ip6_vfc & IPV6_VERSION)); 1787 #endif 1788 m_freem(m); 1789 return (IPPROTO_NONE); 1790 } 1791 1792 /* verify the inner packet is destined to a mcast group */ 1793 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1794 ++pim6stat.pim6s_rcv_badregisters; 1795 #ifdef MRT6DEBUG 1796 if (mrt6debug & DEBUG_PIM) 1797 log(LOG_DEBUG, 1798 "pim6_input: inner packet of register " 1799 "is not multicast %s\n", 1800 ip6_sprintf(&eip6->ip6_dst)); 1801 #endif 1802 m_freem(m); 1803 return (IPPROTO_DONE); 1804 } 1805 1806 /* 1807 * make a copy of the whole header to pass to the daemon later. 1808 */ 1809 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1810 if (mcp == NULL) { 1811 #ifdef MRT6DEBUG 1812 log(LOG_ERR, 1813 "pim6_input: pim register: " 1814 "could not copy register head\n"); 1815 #endif 1816 m_freem(m); 1817 return (IPPROTO_DONE); 1818 } 1819 1820 /* 1821 * forward the inner ip6 packet; point m_data at the inner ip6. 1822 */ 1823 m_adj(m, off + PIM_MINLEN); 1824 #ifdef MRT6DEBUG 1825 if (mrt6debug & DEBUG_PIM) { 1826 log(LOG_DEBUG, 1827 "pim6_input: forwarding decapsulated register: " 1828 "src %s, dst %s, mif %d\n", 1829 ip6_sprintf(&eip6->ip6_src), 1830 ip6_sprintf(&eip6->ip6_dst), 1831 reg_mif_num); 1832 } 1833 #endif 1834 1835 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1836 (struct sockaddr *) &dst, 1837 (struct rtentry *) NULL); 1838 1839 /* prepare the register head to send to the mrouting daemon */ 1840 m = mcp; 1841 } 1842 1843 /* 1844 * Pass the PIM message up to the daemon; if it is a register message 1845 * pass the 'head' only up to the daemon. This includes the 1846 * encapsulator ip6 header, pim header, register header and the 1847 * encapsulated ip6 header. 1848 */ 1849 pim6_input_to_daemon: 1850 rip6_input(&m, offp, proto); 1851 return (IPPROTO_DONE); 1852 } 1853
Indexes created Mon Sep 22 10:09:38 GMT 2025