ip6_mroute.c revision 1.40
1 /* $NetBSD: ip6_mroute.c,v 1.40 2002/11/09 03:12:05 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 * IP multicast forwarding procedures 37 * 38 * Written by David Waitzman, BBN Labs, August 1988. 39 * Modified by Steve Deering, Stanford, February 1989. 40 * Modified by Mark J. Steiglitz, Stanford, May, 1991 41 * Modified by Van Jacobson, LBL, January 1993 42 * Modified by Ajit Thyagarajan, PARC, August 1993 43 * Modified by Bill Fenner, PARC, April 1994 44 * 45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 46 */ 47 48 #include <sys/cdefs.h> 49 __KERNEL_RCSID(0, "$NetBSD: ip6_mroute.c,v 1.40 2002/11/09 03:12:05 itojun Exp $"); 50 51 #include "opt_inet.h" 52 53 #ifndef _KERNEL 54 # ifdef KERNEL 55 # define _KERNEL 56 # endif 57 #endif 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/callout.h> 62 #include <sys/mbuf.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/sockio.h> 66 #include <sys/protosw.h> 67 #include <sys/errno.h> 68 #include <sys/time.h> 69 #include <sys/kernel.h> 70 #include <sys/ioctl.h> 71 #include <sys/syslog.h> 72 73 #include <net/if.h> 74 #include <net/route.h> 75 #include <net/raw_cb.h> 76 77 #include <netinet/in.h> 78 #include <netinet/in_var.h> 79 #ifdef MULTICAST_PMTUD 80 #include <netinet/icmp6.h> 81 #endif 82 83 #include <netinet/ip6.h> 84 #include <netinet6/ip6_var.h> 85 #include <netinet6/ip6_mroute.h> 86 #include <netinet6/pim6.h> 87 #include <netinet6/pim6_var.h> 88 #include <netinet6/nd6.h> 89 90 #include <net/net_osdep.h> 91 92 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 93 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 94 95 static int set_pim6 __P((int *)); 96 static int get_pim6 __P((struct mbuf *)); 97 static int socket_send __P((struct socket *, struct mbuf *, 98 struct sockaddr_in6 *)); 99 static int register_send __P((struct ip6_hdr *, struct mif6 *, 100 struct mbuf *)); 101 102 /* 103 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 104 * except for netstat or debugging purposes. 105 */ 106 struct socket *ip6_mrouter = NULL; 107 int ip6_mrouter_ver = 0; 108 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 109 struct mrt6stat mrt6stat; 110 111 #define NO_RTE_FOUND 0x1 112 #define RTE_FOUND 0x2 113 114 struct mf6c *mf6ctable[MF6CTBLSIZ]; 115 u_char n6expire[MF6CTBLSIZ]; 116 static struct mif6 mif6table[MAXMIFS]; 117 #ifdef MRT6DEBUG 118 u_int mrt6debug = 0; /* debug level */ 119 #define DEBUG_MFC 0x02 120 #define DEBUG_FORWARD 0x04 121 #define DEBUG_EXPIRE 0x08 122 #define DEBUG_XMIT 0x10 123 #define DEBUG_REG 0x20 124 #define DEBUG_PIM 0x40 125 #endif 126 127 static void expire_upcalls __P((void *)); 128 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 129 #define UPCALL_EXPIRE 6 /* number of timeouts */ 130 131 #ifdef INET 132 #ifdef MROUTING 133 extern struct socket *ip_mrouter; 134 #endif 135 #endif 136 137 /* 138 * 'Interfaces' associated with decapsulator (so we can tell 139 * packets that went through it from ones that get reflected 140 * by a broken gateway). These interfaces are never linked into 141 * the system ifnet list & no routes point to them. I.e., packets 142 * can't be sent this way. They only exist as a placeholder for 143 * multicast source verification. 144 */ 145 struct ifnet multicast_register_if; 146 147 #define ENCAP_HOPS 64 148 149 /* 150 * Private variables. 151 */ 152 static mifi_t nummifs = 0; 153 static mifi_t reg_mif_num = (mifi_t)-1; 154 155 static struct pim6stat pim6stat; 156 static int pim6; 157 158 /* 159 * Hash function for a source, group entry 160 */ 161 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 162 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 163 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 164 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 165 166 /* 167 * Find a route for a given origin IPv6 address and Multicast group address. 168 * Quality of service parameter to be added in the future!!! 169 */ 170 171 #define MF6CFIND(o, g, rt) do { \ 172 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 173 rt = NULL; \ 174 mrt6stat.mrt6s_mfc_lookups++; \ 175 while (_rt) { \ 176 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 177 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 178 (_rt->mf6c_stall == NULL)) { \ 179 rt = _rt; \ 180 break; \ 181 } \ 182 _rt = _rt->mf6c_next; \ 183 } \ 184 if (rt == NULL) { \ 185 mrt6stat.mrt6s_mfc_misses++; \ 186 } \ 187 } while (/*CONSTCOND*/ 0) 188 189 /* 190 * Macros to compute elapsed time efficiently 191 * Borrowed from Van Jacobson's scheduling code 192 */ 193 #define TV_DELTA(a, b, delta) do { \ 194 int xxs; \ 195 \ 196 delta = (a).tv_usec - (b).tv_usec; \ 197 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 198 switch (xxs) { \ 199 case 2: \ 200 delta += 1000000; \ 201 /* FALLTHROUGH */ \ 202 case 1: \ 203 delta += 1000000; \ 204 break; \ 205 default: \ 206 delta += (1000000 * xxs); \ 207 } \ 208 } \ 209 } while (/*CONSTCOND*/ 0) 210 211 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 212 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 213 214 #ifdef UPCALL_TIMING 215 #define UPCALL_MAX 50 216 u_long upcall_data[UPCALL_MAX + 1]; 217 static void collate(); 218 #endif /* UPCALL_TIMING */ 219 220 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 221 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 222 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 223 static int add_m6if __P((struct mif6ctl *)); 224 static int del_m6if __P((mifi_t *)); 225 static int add_m6fc __P((struct mf6cctl *)); 226 static int del_m6fc __P((struct mf6cctl *)); 227 228 static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER; 229 230 /* 231 * Handle MRT setsockopt commands to modify the multicast routing tables. 232 */ 233 int 234 ip6_mrouter_set(cmd, so, m) 235 int cmd; 236 struct socket *so; 237 struct mbuf *m; 238 { 239 if (cmd != MRT6_INIT && so != ip6_mrouter) 240 return EACCES; 241 242 switch (cmd) { 243 case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd); 244 case MRT6_INIT: return ip6_mrouter_init(so, m, cmd); 245 case MRT6_DONE: return ip6_mrouter_done(); 246 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 247 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 248 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 249 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 250 case MRT6_PIM: return set_pim6(mtod(m, int *)); 251 default: return EOPNOTSUPP; 252 } 253 } 254 255 /* 256 * Handle MRT getsockopt commands 257 */ 258 int 259 ip6_mrouter_get(cmd, so, m) 260 int cmd; 261 struct socket *so; 262 struct mbuf **m; 263 { 264 struct mbuf *mb; 265 266 if (so != ip6_mrouter) return EACCES; 267 268 *m = mb = m_get(M_WAIT, MT_SOOPTS); 269 270 switch (cmd) { 271 case MRT6_PIM: 272 return get_pim6(mb); 273 default: 274 m_free(mb); 275 return EOPNOTSUPP; 276 } 277 } 278 279 /* 280 * Handle ioctl commands to obtain information from the cache 281 */ 282 int 283 mrt6_ioctl(cmd, data) 284 int cmd; 285 caddr_t data; 286 { 287 288 switch (cmd) { 289 case SIOCGETSGCNT_IN6: 290 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 291 case SIOCGETMIFCNT_IN6: 292 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 293 default: 294 return (EINVAL); 295 } 296 } 297 298 /* 299 * returns the packet, byte, rpf-failure count for the source group provided 300 */ 301 static int 302 get_sg_cnt(req) 303 struct sioc_sg_req6 *req; 304 { 305 struct mf6c *rt; 306 int s; 307 308 s = splsoftnet(); 309 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 310 splx(s); 311 if (rt != NULL) { 312 req->pktcnt = rt->mf6c_pkt_cnt; 313 req->bytecnt = rt->mf6c_byte_cnt; 314 req->wrong_if = rt->mf6c_wrong_if; 315 } else 316 return (ESRCH); 317 #if 0 318 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 319 #endif 320 321 return 0; 322 } 323 324 /* 325 * returns the input and output packet and byte counts on the mif provided 326 */ 327 static int 328 get_mif6_cnt(req) 329 struct sioc_mif_req6 *req; 330 { 331 mifi_t mifi = req->mifi; 332 333 if (mifi >= nummifs) 334 return EINVAL; 335 336 req->icount = mif6table[mifi].m6_pkt_in; 337 req->ocount = mif6table[mifi].m6_pkt_out; 338 req->ibytes = mif6table[mifi].m6_bytes_in; 339 req->obytes = mif6table[mifi].m6_bytes_out; 340 341 return 0; 342 } 343 344 /* 345 * Get PIM processiong global 346 */ 347 static int 348 get_pim6(m) 349 struct mbuf *m; 350 { 351 int *i; 352 353 i = mtod(m, int *); 354 355 *i = pim6; 356 357 return 0; 358 } 359 360 static int 361 set_pim6(i) 362 int *i; 363 { 364 if ((*i != 1) && (*i != 0)) 365 return EINVAL; 366 367 pim6 = *i; 368 369 return 0; 370 } 371 372 /* 373 * Enable multicast routing 374 */ 375 static int 376 ip6_mrouter_init(so, m, cmd) 377 struct socket *so; 378 struct mbuf *m; 379 int cmd; 380 { 381 int *v; 382 383 #ifdef MRT6DEBUG 384 if (mrt6debug) 385 log(LOG_DEBUG, 386 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 387 so->so_type, so->so_proto->pr_protocol); 388 #endif 389 390 if (so->so_type != SOCK_RAW || 391 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 392 return EOPNOTSUPP; 393 394 if (!m || (m->m_len != sizeof(int *))) 395 return ENOPROTOOPT; 396 397 v = mtod(m, int *); 398 if (*v != 1) 399 return ENOPROTOOPT; 400 401 if (ip6_mrouter != NULL) return EADDRINUSE; 402 403 ip6_mrouter = so; 404 ip6_mrouter_ver = cmd; 405 406 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 407 bzero((caddr_t)n6expire, sizeof(n6expire)); 408 409 pim6 = 0;/* used for stubbing out/in pim stuff */ 410 411 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 412 expire_upcalls, NULL); 413 414 #ifdef MRT6DEBUG 415 if (mrt6debug) 416 log(LOG_DEBUG, "ip6_mrouter_init\n"); 417 #endif 418 419 return 0; 420 } 421 422 /* 423 * Disable multicast routing 424 */ 425 int 426 ip6_mrouter_done() 427 { 428 mifi_t mifi; 429 int i; 430 struct ifnet *ifp; 431 struct in6_ifreq ifr; 432 struct mf6c *rt; 433 struct rtdetq *rte; 434 int s; 435 436 s = splsoftnet(); 437 438 /* 439 * For each phyint in use, disable promiscuous reception of all IPv6 440 * multicasts. 441 */ 442 #ifdef INET 443 #ifdef MROUTING 444 /* 445 * If there is still IPv4 multicast routing daemon, 446 * we remain interfaces to receive all muliticasted packets. 447 * XXX: there may be an interface in which the IPv4 multicast 448 * daemon is not interested... 449 */ 450 if (!ip_mrouter) 451 #endif 452 #endif 453 { 454 for (mifi = 0; mifi < nummifs; mifi++) { 455 if (mif6table[mifi].m6_ifp && 456 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 457 ifr.ifr_addr.sin6_family = AF_INET6; 458 ifr.ifr_addr.sin6_addr= in6addr_any; 459 ifp = mif6table[mifi].m6_ifp; 460 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 461 (caddr_t)&ifr); 462 } 463 } 464 } 465 #ifdef notyet 466 bzero((caddr_t)qtable, sizeof(qtable)); 467 bzero((caddr_t)tbftable, sizeof(tbftable)); 468 #endif 469 bzero((caddr_t)mif6table, sizeof(mif6table)); 470 nummifs = 0; 471 472 pim6 = 0; /* used to stub out/in pim specific code */ 473 474 callout_stop(&expire_upcalls_ch); 475 476 /* 477 * Free all multicast forwarding cache entries. 478 */ 479 for (i = 0; i < MF6CTBLSIZ; i++) { 480 rt = mf6ctable[i]; 481 while (rt) { 482 struct mf6c *frt; 483 484 for (rte = rt->mf6c_stall; rte != NULL; ) { 485 struct rtdetq *n = rte->next; 486 487 m_free(rte->m); 488 free(rte, M_MRTABLE); 489 rte = n; 490 } 491 frt = rt; 492 rt = rt->mf6c_next; 493 free(frt, M_MRTABLE); 494 } 495 } 496 497 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 498 499 /* 500 * Reset de-encapsulation cache 501 */ 502 reg_mif_num = -1; 503 504 ip6_mrouter = NULL; 505 ip6_mrouter_ver = 0; 506 507 splx(s); 508 509 #ifdef MRT6DEBUG 510 if (mrt6debug) 511 log(LOG_DEBUG, "ip6_mrouter_done\n"); 512 #endif 513 514 return 0; 515 } 516 517 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 518 519 /* 520 * Add a mif to the mif table 521 */ 522 static int 523 add_m6if(mifcp) 524 struct mif6ctl *mifcp; 525 { 526 struct mif6 *mifp; 527 struct ifnet *ifp; 528 struct in6_ifreq ifr; 529 int error, s; 530 #ifdef notyet 531 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 532 #endif 533 534 if (mifcp->mif6c_mifi >= MAXMIFS) 535 return EINVAL; 536 mifp = mif6table + mifcp->mif6c_mifi; 537 if (mifp->m6_ifp) 538 return EADDRINUSE; /* XXX: is it appropriate? */ 539 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 540 return ENXIO; 541 /* 542 * XXX: some OSes can remove ifp and clear ifindex2ifnet[id] 543 * even for id between 0 and if_index. 544 */ 545 if ((ifp = ifindex2ifnet[mifcp->mif6c_pifi]) == NULL) 546 return ENXIO; 547 548 if (mifcp->mif6c_flags & MIFF_REGISTER) { 549 if (reg_mif_num == (mifi_t)-1) { 550 strcpy(multicast_register_if.if_xname, 551 "register_mif"); /* XXX */ 552 multicast_register_if.if_flags |= IFF_LOOPBACK; 553 multicast_register_if.if_index = mifcp->mif6c_mifi; 554 reg_mif_num = mifcp->mif6c_mifi; 555 } 556 557 ifp = &multicast_register_if; 558 559 } /* if REGISTER */ 560 else { 561 /* Make sure the interface supports multicast */ 562 if ((ifp->if_flags & IFF_MULTICAST) == 0) 563 return EOPNOTSUPP; 564 565 s = splsoftnet(); 566 /* 567 * Enable promiscuous reception of all IPv6 multicasts 568 * from the interface. 569 */ 570 ifr.ifr_addr.sin6_family = AF_INET6; 571 ifr.ifr_addr.sin6_addr = in6addr_any; 572 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 573 splx(s); 574 if (error) 575 return error; 576 } 577 578 s = splsoftnet(); 579 mifp->m6_flags = mifcp->mif6c_flags; 580 mifp->m6_ifp = ifp; 581 #ifdef notyet 582 /* scaling up here allows division by 1024 in critical code */ 583 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 584 #endif 585 /* initialize per mif pkt counters */ 586 mifp->m6_pkt_in = 0; 587 mifp->m6_pkt_out = 0; 588 mifp->m6_bytes_in = 0; 589 mifp->m6_bytes_out = 0; 590 splx(s); 591 592 /* Adjust nummifs up if the mifi is higher than nummifs */ 593 if (nummifs <= mifcp->mif6c_mifi) 594 nummifs = mifcp->mif6c_mifi + 1; 595 596 #ifdef MRT6DEBUG 597 if (mrt6debug) 598 log(LOG_DEBUG, 599 "add_mif #%d, phyint %s%d\n", 600 mifcp->mif6c_mifi, 601 ifp->if_name, ifp->if_unit); 602 #endif 603 604 return 0; 605 } 606 607 /* 608 * Delete a mif from the mif table 609 */ 610 static int 611 del_m6if(mifip) 612 mifi_t *mifip; 613 { 614 struct mif6 *mifp = mif6table + *mifip; 615 mifi_t mifi; 616 struct ifnet *ifp; 617 struct in6_ifreq ifr; 618 int s; 619 620 if (*mifip >= nummifs) 621 return EINVAL; 622 if (mifp->m6_ifp == NULL) 623 return EINVAL; 624 625 s = splsoftnet(); 626 627 if (!(mifp->m6_flags & MIFF_REGISTER)) { 628 /* 629 * XXX: what if there is yet IPv4 multicast daemon 630 * using the interface? 631 */ 632 ifp = mifp->m6_ifp; 633 634 ifr.ifr_addr.sin6_family = AF_INET6; 635 ifr.ifr_addr.sin6_addr = in6addr_any; 636 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 637 } 638 639 #ifdef notyet 640 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 641 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 642 #endif 643 bzero((caddr_t)mifp, sizeof (*mifp)); 644 645 /* Adjust nummifs down */ 646 for (mifi = nummifs; mifi > 0; mifi--) 647 if (mif6table[mifi - 1].m6_ifp) 648 break; 649 nummifs = mifi; 650 651 splx(s); 652 653 #ifdef MRT6DEBUG 654 if (mrt6debug) 655 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 656 #endif 657 658 return 0; 659 } 660 661 /* 662 * Add an mfc entry 663 */ 664 static int 665 add_m6fc(mfccp) 666 struct mf6cctl *mfccp; 667 { 668 struct mf6c *rt; 669 u_long hash; 670 struct rtdetq *rte; 671 u_short nstl; 672 int s; 673 674 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 675 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 676 677 /* If an entry already exists, just update the fields */ 678 if (rt) { 679 #ifdef MRT6DEBUG 680 if (mrt6debug & DEBUG_MFC) 681 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 682 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 683 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 684 mfccp->mf6cc_parent); 685 #endif 686 687 s = splsoftnet(); 688 rt->mf6c_parent = mfccp->mf6cc_parent; 689 rt->mf6c_ifset = mfccp->mf6cc_ifset; 690 splx(s); 691 return 0; 692 } 693 694 /* 695 * Find the entry for which the upcall was made and update 696 */ 697 s = splsoftnet(); 698 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 699 mfccp->mf6cc_mcastgrp.sin6_addr); 700 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 701 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 702 &mfccp->mf6cc_origin.sin6_addr) && 703 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 704 &mfccp->mf6cc_mcastgrp.sin6_addr) && 705 (rt->mf6c_stall != NULL)) { 706 707 if (nstl++) 708 log(LOG_ERR, 709 "add_m6fc: %s o %s g %s p %x dbx %p\n", 710 "multiple kernel entries", 711 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 712 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 713 mfccp->mf6cc_parent, rt->mf6c_stall); 714 715 #ifdef MRT6DEBUG 716 if (mrt6debug & DEBUG_MFC) 717 log(LOG_DEBUG, 718 "add_m6fc o %s g %s p %x dbg %x\n", 719 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 720 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 721 mfccp->mf6cc_parent, rt->mf6c_stall); 722 #endif 723 724 rt->mf6c_origin = mfccp->mf6cc_origin; 725 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 726 rt->mf6c_parent = mfccp->mf6cc_parent; 727 rt->mf6c_ifset = mfccp->mf6cc_ifset; 728 /* initialize pkt counters per src-grp */ 729 rt->mf6c_pkt_cnt = 0; 730 rt->mf6c_byte_cnt = 0; 731 rt->mf6c_wrong_if = 0; 732 733 rt->mf6c_expire = 0; /* Don't clean this guy up */ 734 n6expire[hash]--; 735 736 /* free packets Qed at the end of this entry */ 737 for (rte = rt->mf6c_stall; rte != NULL; ) { 738 struct rtdetq *n = rte->next; 739 ip6_mdq(rte->m, rte->ifp, rt); 740 m_freem(rte->m); 741 #ifdef UPCALL_TIMING 742 collate(&(rte->t)); 743 #endif /* UPCALL_TIMING */ 744 free(rte, M_MRTABLE); 745 rte = n; 746 } 747 rt->mf6c_stall = NULL; 748 } 749 } 750 751 /* 752 * It is possible that an entry is being inserted without an upcall 753 */ 754 if (nstl == 0) { 755 #ifdef MRT6DEBUG 756 if (mrt6debug & DEBUG_MFC) 757 log(LOG_DEBUG, 758 "add_mfc no upcall h %d o %s g %s p %x\n", 759 hash, 760 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 761 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 762 mfccp->mf6cc_parent); 763 #endif 764 765 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 766 767 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)) { 771 772 rt->mf6c_origin = mfccp->mf6cc_origin; 773 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 774 rt->mf6c_parent = mfccp->mf6cc_parent; 775 rt->mf6c_ifset = mfccp->mf6cc_ifset; 776 /* initialize pkt counters per src-grp */ 777 rt->mf6c_pkt_cnt = 0; 778 rt->mf6c_byte_cnt = 0; 779 rt->mf6c_wrong_if = 0; 780 781 if (rt->mf6c_expire) 782 n6expire[hash]--; 783 rt->mf6c_expire = 0; 784 } 785 } 786 if (rt == NULL) { 787 /* no upcall, so make a new entry */ 788 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 789 M_NOWAIT); 790 if (rt == NULL) { 791 splx(s); 792 return ENOBUFS; 793 } 794 795 /* insert new entry at head of hash chain */ 796 rt->mf6c_origin = mfccp->mf6cc_origin; 797 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 798 rt->mf6c_parent = mfccp->mf6cc_parent; 799 rt->mf6c_ifset = mfccp->mf6cc_ifset; 800 /* initialize pkt counters per src-grp */ 801 rt->mf6c_pkt_cnt = 0; 802 rt->mf6c_byte_cnt = 0; 803 rt->mf6c_wrong_if = 0; 804 rt->mf6c_expire = 0; 805 rt->mf6c_stall = NULL; 806 807 /* link into table */ 808 rt->mf6c_next = mf6ctable[hash]; 809 mf6ctable[hash] = rt; 810 } 811 } 812 splx(s); 813 return 0; 814 } 815 816 #ifdef UPCALL_TIMING 817 /* 818 * collect delay statistics on the upcalls 819 */ 820 static void 821 collate(t) 822 struct timeval *t; 823 { 824 u_long d; 825 struct timeval tp; 826 u_long delta; 827 828 GET_TIME(tp); 829 830 if (TV_LT(*t, tp)) 831 { 832 TV_DELTA(tp, *t, delta); 833 834 d = delta >> 10; 835 if (d > UPCALL_MAX) 836 d = UPCALL_MAX; 837 838 ++upcall_data[d]; 839 } 840 } 841 #endif /* UPCALL_TIMING */ 842 843 /* 844 * Delete an mfc entry 845 */ 846 static int 847 del_m6fc(mfccp) 848 struct mf6cctl *mfccp; 849 { 850 struct sockaddr_in6 origin; 851 struct sockaddr_in6 mcastgrp; 852 struct mf6c *rt; 853 struct mf6c **nptr; 854 u_long hash; 855 int s; 856 857 origin = mfccp->mf6cc_origin; 858 mcastgrp = mfccp->mf6cc_mcastgrp; 859 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 860 861 #ifdef MRT6DEBUG 862 if (mrt6debug & DEBUG_MFC) 863 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 864 ip6_sprintf(&origin.sin6_addr), 865 ip6_sprintf(&mcastgrp.sin6_addr)); 866 #endif 867 868 s = splsoftnet(); 869 870 nptr = &mf6ctable[hash]; 871 while ((rt = *nptr) != NULL) { 872 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 873 &rt->mf6c_origin.sin6_addr) && 874 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 875 &rt->mf6c_mcastgrp.sin6_addr) && 876 rt->mf6c_stall == NULL) 877 break; 878 879 nptr = &rt->mf6c_next; 880 } 881 if (rt == NULL) { 882 splx(s); 883 return EADDRNOTAVAIL; 884 } 885 886 *nptr = rt->mf6c_next; 887 free(rt, M_MRTABLE); 888 889 splx(s); 890 891 return 0; 892 } 893 894 static int 895 socket_send(s, mm, src) 896 struct socket *s; 897 struct mbuf *mm; 898 struct sockaddr_in6 *src; 899 { 900 if (s) { 901 if (sbappendaddr(&s->so_rcv, 902 (struct sockaddr *)src, 903 mm, (struct mbuf *)0) != 0) { 904 sorwakeup(s); 905 return 0; 906 } 907 } 908 m_freem(mm); 909 return -1; 910 } 911 912 /* 913 * IPv6 multicast forwarding function. This function assumes that the packet 914 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 915 * pointed to by "ifp", and the packet is to be relayed to other networks 916 * that have members of the packet's destination IPv6 multicast group. 917 * 918 * The packet is returned unscathed to the caller, unless it is 919 * erroneous, in which case a non-zero return value tells the caller to 920 * discard it. 921 */ 922 923 int 924 ip6_mforward(ip6, ifp, m) 925 struct ip6_hdr *ip6; 926 struct ifnet *ifp; 927 struct mbuf *m; 928 { 929 struct mf6c *rt; 930 struct mif6 *mifp; 931 struct mbuf *mm; 932 int s; 933 mifi_t mifi; 934 long time_second = time.tv_sec; 935 936 #ifdef MRT6DEBUG 937 if (mrt6debug & DEBUG_FORWARD) 938 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 939 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 940 ifp->if_index); 941 #endif 942 943 /* 944 * Don't forward a packet with Hop limit of zero or one, 945 * or a packet destined to a local-only group. 946 */ 947 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 948 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 949 return 0; 950 ip6->ip6_hlim--; 951 952 /* 953 * Source address check: do not forward packets with unspecified 954 * source. It was discussed in July 2000, on ipngwg mailing list. 955 * This is rather more serious than unicast cases, because some 956 * MLD packets can be sent with the unspecified source address 957 * (although such packets must normally set 1 to the hop limit field). 958 */ 959 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 960 ip6stat.ip6s_cantforward++; 961 if (ip6_log_time + ip6_log_interval < time_second) { 962 ip6_log_time = time_second; 963 log(LOG_DEBUG, 964 "cannot forward " 965 "from %s to %s nxt %d received on %s\n", 966 ip6_sprintf(&ip6->ip6_src), 967 ip6_sprintf(&ip6->ip6_dst), 968 ip6->ip6_nxt, 969 m->m_pkthdr.rcvif ? 970 if_name(m->m_pkthdr.rcvif) : "?"); 971 } 972 return 0; 973 } 974 975 /* 976 * Determine forwarding mifs from the forwarding cache table 977 */ 978 s = splsoftnet(); 979 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 980 981 /* Entry exists, so forward if necessary */ 982 if (rt) { 983 splx(s); 984 return (ip6_mdq(m, ifp, rt)); 985 } else { 986 /* 987 * If we don't have a route for packet's origin, 988 * Make a copy of the packet & 989 * send message to routing daemon 990 */ 991 992 struct mbuf *mb0; 993 struct rtdetq *rte; 994 u_long hash; 995 /* int i, npkts;*/ 996 #ifdef UPCALL_TIMING 997 struct timeval tp; 998 999 GET_TIME(tp); 1000 #endif /* UPCALL_TIMING */ 1001 1002 mrt6stat.mrt6s_no_route++; 1003 #ifdef MRT6DEBUG 1004 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1005 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1006 ip6_sprintf(&ip6->ip6_src), 1007 ip6_sprintf(&ip6->ip6_dst)); 1008 #endif 1009 1010 /* 1011 * Allocate mbufs early so that we don't do extra work if we 1012 * are just going to fail anyway. 1013 */ 1014 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1015 M_NOWAIT); 1016 if (rte == NULL) { 1017 splx(s); 1018 return ENOBUFS; 1019 } 1020 mb0 = m_copy(m, 0, M_COPYALL); 1021 /* 1022 * Pullup packet header if needed before storing it, 1023 * as other references may modify it in the meantime. 1024 */ 1025 if (mb0 && 1026 (M_READONLY(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1027 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1028 if (mb0 == NULL) { 1029 free(rte, M_MRTABLE); 1030 splx(s); 1031 return ENOBUFS; 1032 } 1033 1034 /* is there an upcall waiting for this packet? */ 1035 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1036 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1037 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1038 &rt->mf6c_origin.sin6_addr) && 1039 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1040 &rt->mf6c_mcastgrp.sin6_addr) && 1041 (rt->mf6c_stall != NULL)) 1042 break; 1043 } 1044 1045 if (rt == NULL) { 1046 struct mrt6msg *im; 1047 struct omrt6msg *oim; 1048 1049 /* no upcall, so make a new entry */ 1050 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1051 M_NOWAIT); 1052 if (rt == NULL) { 1053 free(rte, M_MRTABLE); 1054 m_freem(mb0); 1055 splx(s); 1056 return ENOBUFS; 1057 } 1058 /* 1059 * Make a copy of the header to send to the user 1060 * level process 1061 */ 1062 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1063 1064 if (mm == NULL) { 1065 free(rte, M_MRTABLE); 1066 m_freem(mb0); 1067 free(rt, M_MRTABLE); 1068 splx(s); 1069 return ENOBUFS; 1070 } 1071 1072 /* 1073 * Send message to routing daemon 1074 */ 1075 sin6.sin6_addr = ip6->ip6_src; 1076 1077 im = NULL; 1078 oim = NULL; 1079 switch (ip6_mrouter_ver) { 1080 case MRT6_OINIT: 1081 oim = mtod(mm, struct omrt6msg *); 1082 oim->im6_msgtype = MRT6MSG_NOCACHE; 1083 oim->im6_mbz = 0; 1084 break; 1085 case MRT6_INIT: 1086 im = mtod(mm, struct mrt6msg *); 1087 im->im6_msgtype = MRT6MSG_NOCACHE; 1088 im->im6_mbz = 0; 1089 break; 1090 default: 1091 free(rte, M_MRTABLE); 1092 m_freem(mb0); 1093 free(rt, M_MRTABLE); 1094 splx(s); 1095 return EINVAL; 1096 } 1097 1098 #ifdef MRT6DEBUG 1099 if (mrt6debug & DEBUG_FORWARD) 1100 log(LOG_DEBUG, 1101 "getting the iif info in the kernel\n"); 1102 #endif 1103 1104 for (mifp = mif6table, mifi = 0; 1105 mifi < nummifs && mifp->m6_ifp != ifp; 1106 mifp++, mifi++) 1107 ; 1108 1109 switch (ip6_mrouter_ver) { 1110 case MRT6_OINIT: 1111 oim->im6_mif = mifi; 1112 break; 1113 case MRT6_INIT: 1114 im->im6_mif = mifi; 1115 break; 1116 } 1117 1118 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1119 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1120 "socket queue full\n"); 1121 mrt6stat.mrt6s_upq_sockfull++; 1122 free(rte, M_MRTABLE); 1123 m_freem(mb0); 1124 free(rt, M_MRTABLE); 1125 splx(s); 1126 return ENOBUFS; 1127 } 1128 1129 mrt6stat.mrt6s_upcalls++; 1130 1131 /* insert new entry at head of hash chain */ 1132 bzero(rt, sizeof(*rt)); 1133 rt->mf6c_origin.sin6_family = AF_INET6; 1134 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1135 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1136 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1137 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1138 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1139 rt->mf6c_expire = UPCALL_EXPIRE; 1140 n6expire[hash]++; 1141 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1142 1143 /* link into table */ 1144 rt->mf6c_next = mf6ctable[hash]; 1145 mf6ctable[hash] = rt; 1146 /* Add this entry to the end of the queue */ 1147 rt->mf6c_stall = rte; 1148 } else { 1149 /* determine if q has overflowed */ 1150 struct rtdetq **p; 1151 int npkts = 0; 1152 1153 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1154 if (++npkts > MAX_UPQ6) { 1155 mrt6stat.mrt6s_upq_ovflw++; 1156 free(rte, M_MRTABLE); 1157 m_freem(mb0); 1158 splx(s); 1159 return 0; 1160 } 1161 1162 /* Add this entry to the end of the queue */ 1163 *p = rte; 1164 } 1165 1166 rte->next = NULL; 1167 rte->m = mb0; 1168 rte->ifp = ifp; 1169 #ifdef UPCALL_TIMING 1170 rte->t = tp; 1171 #endif /* UPCALL_TIMING */ 1172 1173 splx(s); 1174 1175 return 0; 1176 } 1177 } 1178 1179 /* 1180 * Clean up cache entries if upcalls are not serviced 1181 * Call from the Slow Timeout mechanism, every half second. 1182 */ 1183 static void 1184 expire_upcalls(unused) 1185 void *unused; 1186 { 1187 struct rtdetq *rte; 1188 struct mf6c *mfc, **nptr; 1189 int i; 1190 int s; 1191 1192 s = splsoftnet(); 1193 for (i = 0; i < MF6CTBLSIZ; i++) { 1194 if (n6expire[i] == 0) 1195 continue; 1196 nptr = &mf6ctable[i]; 1197 while ((mfc = *nptr) != NULL) { 1198 rte = mfc->mf6c_stall; 1199 /* 1200 * Skip real cache entries 1201 * Make sure it wasn't marked to not expire (shouldn't happen) 1202 * If it expires now 1203 */ 1204 if (rte != NULL && 1205 mfc->mf6c_expire != 0 && 1206 --mfc->mf6c_expire == 0) { 1207 #ifdef MRT6DEBUG 1208 if (mrt6debug & DEBUG_EXPIRE) 1209 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1210 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1211 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1212 #endif 1213 /* 1214 * drop all the packets 1215 * free the mbuf with the pkt, if, timing info 1216 */ 1217 do { 1218 struct rtdetq *n = rte->next; 1219 m_freem(rte->m); 1220 free(rte, M_MRTABLE); 1221 rte = n; 1222 } while (rte != NULL); 1223 mrt6stat.mrt6s_cache_cleanups++; 1224 n6expire[i]--; 1225 1226 *nptr = mfc->mf6c_next; 1227 free(mfc, M_MRTABLE); 1228 } else { 1229 nptr = &mfc->mf6c_next; 1230 } 1231 } 1232 } 1233 splx(s); 1234 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1235 expire_upcalls, NULL); 1236 } 1237 1238 /* 1239 * Packet forwarding routine once entry in the cache is made 1240 */ 1241 static int 1242 ip6_mdq(m, ifp, rt) 1243 struct mbuf *m; 1244 struct ifnet *ifp; 1245 struct mf6c *rt; 1246 { 1247 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1248 mifi_t mifi, iif; 1249 struct mif6 *mifp; 1250 int plen = m->m_pkthdr.len; 1251 1252 /* 1253 * Macro to send packet on mif. Since RSVP packets don't get counted on 1254 * input, they shouldn't get counted on output, so statistics keeping is 1255 * separate. 1256 */ 1257 1258 #define MC6_SEND(ip6, mifp, m) do { \ 1259 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1260 register_send((ip6), (mifp), (m)); \ 1261 else \ 1262 phyint_send((ip6), (mifp), (m)); \ 1263 } while (/*CONSTCOND*/ 0) 1264 1265 /* 1266 * Don't forward if it didn't arrive from the parent mif 1267 * for its origin. 1268 */ 1269 mifi = rt->mf6c_parent; 1270 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1271 /* came in the wrong interface */ 1272 #ifdef MRT6DEBUG 1273 if (mrt6debug & DEBUG_FORWARD) 1274 log(LOG_DEBUG, 1275 "wrong if: ifid %d mifi %d mififid %x\n", 1276 ifp->if_index, mifi, 1277 mif6table[mifi].m6_ifp->if_index); 1278 #endif 1279 mrt6stat.mrt6s_wrong_if++; 1280 rt->mf6c_wrong_if++; 1281 /* 1282 * If we are doing PIM processing, and we are forwarding 1283 * packets on this interface, send a message to the 1284 * routing daemon. 1285 */ 1286 /* have to make sure this is a valid mif */ 1287 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1288 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1289 /* 1290 * Check the M_LOOP flag to avoid an 1291 * unnecessary PIM assert. 1292 * XXX: M_LOOP is an ad-hoc hack... 1293 */ 1294 static struct sockaddr_in6 sin6 = 1295 { sizeof(sin6), AF_INET6 }; 1296 1297 struct mbuf *mm; 1298 struct mrt6msg *im; 1299 struct omrt6msg *oim; 1300 1301 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1302 if (mm && 1303 (M_READONLY(mm) || 1304 mm->m_len < sizeof(struct ip6_hdr))) 1305 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1306 if (mm == NULL) 1307 return ENOBUFS; 1308 1309 oim = NULL; 1310 im = NULL; 1311 switch (ip6_mrouter_ver) { 1312 case MRT6_OINIT: 1313 oim = mtod(mm, struct omrt6msg *); 1314 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1315 oim->im6_mbz = 0; 1316 break; 1317 case MRT6_INIT: 1318 im = mtod(mm, struct mrt6msg *); 1319 im->im6_msgtype = MRT6MSG_WRONGMIF; 1320 im->im6_mbz = 0; 1321 break; 1322 default: 1323 m_freem(mm); 1324 return EINVAL; 1325 } 1326 1327 for (mifp = mif6table, iif = 0; 1328 iif < nummifs && mifp && 1329 mifp->m6_ifp != ifp; 1330 mifp++, iif++) 1331 ; 1332 1333 switch (ip6_mrouter_ver) { 1334 case MRT6_OINIT: 1335 oim->im6_mif = iif; 1336 sin6.sin6_addr = oim->im6_src; 1337 break; 1338 case MRT6_INIT: 1339 im->im6_mif = iif; 1340 sin6.sin6_addr = im->im6_src; 1341 break; 1342 } 1343 1344 mrt6stat.mrt6s_upcalls++; 1345 1346 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1347 #ifdef MRT6DEBUG 1348 if (mrt6debug) 1349 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1350 #endif 1351 ++mrt6stat.mrt6s_upq_sockfull; 1352 return ENOBUFS; 1353 } /* if socket Q full */ 1354 } /* if PIM */ 1355 return 0; 1356 } /* if wrong iif */ 1357 1358 /* If I sourced this packet, it counts as output, else it was input. */ 1359 if (m->m_pkthdr.rcvif == NULL) { 1360 /* XXX: is rcvif really NULL when output?? */ 1361 mif6table[mifi].m6_pkt_out++; 1362 mif6table[mifi].m6_bytes_out += plen; 1363 } else { 1364 mif6table[mifi].m6_pkt_in++; 1365 mif6table[mifi].m6_bytes_in += plen; 1366 } 1367 rt->mf6c_pkt_cnt++; 1368 rt->mf6c_byte_cnt += plen; 1369 1370 /* 1371 * For each mif, forward a copy of the packet if there are group 1372 * members downstream on the interface. 1373 */ 1374 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1375 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1376 #ifdef notyet 1377 /* 1378 * check if the outgoing packet is going to break 1379 * a scope boundary. 1380 * XXX For packets through PIM register tunnel 1381 * interface, we believe a routing daemon. 1382 */ 1383 if ((mif6table[rt->mf6c_parent].m6_flags & 1384 MIFF_REGISTER) == 0 && 1385 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1386 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1387 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1388 &ip6->ip6_dst) || 1389 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1390 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1391 &ip6->ip6_src))) { 1392 ip6stat.ip6s_badscope++; 1393 continue; 1394 } 1395 #endif 1396 1397 mifp->m6_pkt_out++; 1398 mifp->m6_bytes_out += plen; 1399 MC6_SEND(ip6, mifp, m); 1400 } 1401 return 0; 1402 } 1403 1404 static void 1405 phyint_send(ip6, mifp, m) 1406 struct ip6_hdr *ip6; 1407 struct mif6 *mifp; 1408 struct mbuf *m; 1409 { 1410 struct mbuf *mb_copy; 1411 struct ifnet *ifp = mifp->m6_ifp; 1412 int error = 0; 1413 int s = splsoftnet(); 1414 static struct route_in6 ro; 1415 struct in6_multi *in6m; 1416 struct sockaddr_in6 *dst6; 1417 u_long linkmtu; 1418 1419 /* 1420 * Make a new reference to the packet; make sure that 1421 * the IPv6 header is actually copied, not just referenced, 1422 * so that ip6_output() only scribbles on the copy. 1423 */ 1424 mb_copy = m_copy(m, 0, M_COPYALL); 1425 if (mb_copy && 1426 (M_READONLY(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1427 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1428 if (mb_copy == NULL) { 1429 splx(s); 1430 return; 1431 } 1432 /* set MCAST flag to the outgoing packet */ 1433 mb_copy->m_flags |= M_MCAST; 1434 1435 /* 1436 * If we sourced the packet, call ip6_output since we may devide 1437 * the packet into fragments when the packet is too big for the 1438 * outgoing interface. 1439 * Otherwise, we can simply send the packet to the interface 1440 * sending queue. 1441 */ 1442 if (m->m_pkthdr.rcvif == NULL) { 1443 struct ip6_moptions im6o; 1444 1445 im6o.im6o_multicast_ifp = ifp; 1446 /* XXX: ip6_output will override ip6->ip6_hlim */ 1447 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1448 im6o.im6o_multicast_loop = 1; 1449 error = ip6_output(mb_copy, NULL, &ro, 1450 IPV6_FORWARDING, &im6o, NULL); 1451 1452 #ifdef MRT6DEBUG 1453 if (mrt6debug & DEBUG_XMIT) 1454 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1455 mifp - mif6table, error); 1456 #endif 1457 splx(s); 1458 return; 1459 } 1460 1461 /* 1462 * If we belong to the destination multicast group 1463 * on the outgoing interface, loop back a copy. 1464 */ 1465 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1466 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1467 if (in6m != NULL) { 1468 dst6->sin6_len = sizeof(struct sockaddr_in6); 1469 dst6->sin6_family = AF_INET6; 1470 dst6->sin6_addr = ip6->ip6_dst; 1471 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1472 } 1473 /* 1474 * Put the packet into the sending queue of the outgoing interface 1475 * if it would fit in the MTU of the interface. 1476 */ 1477 linkmtu = IN6_LINKMTU(ifp); 1478 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1479 dst6->sin6_len = sizeof(struct sockaddr_in6); 1480 dst6->sin6_family = AF_INET6; 1481 dst6->sin6_addr = ip6->ip6_dst; 1482 /* 1483 * We just call if_output instead of nd6_output here, since 1484 * we need no ND for a multicast forwarded packet...right? 1485 */ 1486 error = (*ifp->if_output)(ifp, mb_copy, 1487 (struct sockaddr *)&ro.ro_dst, NULL); 1488 #ifdef MRT6DEBUG 1489 if (mrt6debug & DEBUG_XMIT) 1490 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1491 mifp - mif6table, error); 1492 #endif 1493 } else { 1494 #ifdef MULTICAST_PMTUD 1495 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1496 #else 1497 #ifdef MRT6DEBUG 1498 if (mrt6debug & DEBUG_XMIT) 1499 log(LOG_DEBUG, 1500 "phyint_send: packet too big on %s o %s g %s" 1501 " size %d(discarded)\n", 1502 if_name(ifp), 1503 ip6_sprintf(&ip6->ip6_src), 1504 ip6_sprintf(&ip6->ip6_dst), 1505 mb_copy->m_pkthdr.len); 1506 #endif /* MRT6DEBUG */ 1507 m_freem(mb_copy); /* simply discard the packet */ 1508 #endif 1509 } 1510 1511 splx(s); 1512 } 1513 1514 static int 1515 register_send(ip6, mif, m) 1516 struct ip6_hdr *ip6; 1517 struct mif6 *mif; 1518 struct mbuf *m; 1519 { 1520 struct mbuf *mm; 1521 int i, len = m->m_pkthdr.len; 1522 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1523 struct mrt6msg *im6; 1524 1525 #ifdef MRT6DEBUG 1526 if (mrt6debug) 1527 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1528 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1529 #endif 1530 ++pim6stat.pim6s_snd_registers; 1531 1532 /* Make a copy of the packet to send to the user level process */ 1533 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1534 if (mm == NULL) 1535 return ENOBUFS; 1536 mm->m_data += max_linkhdr; 1537 mm->m_len = sizeof(struct ip6_hdr); 1538 1539 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1540 m_freem(mm); 1541 return ENOBUFS; 1542 } 1543 i = MHLEN - M_LEADINGSPACE(mm); 1544 if (i > len) 1545 i = len; 1546 mm = m_pullup(mm, i); 1547 if (mm == NULL) 1548 return ENOBUFS; 1549 /* TODO: check it! */ 1550 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1551 1552 /* 1553 * Send message to routing daemon 1554 */ 1555 sin6.sin6_addr = ip6->ip6_src; 1556 1557 im6 = mtod(mm, struct mrt6msg *); 1558 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1559 im6->im6_mbz = 0; 1560 1561 im6->im6_mif = mif - mif6table; 1562 1563 /* iif info is not given for reg. encap.n */ 1564 mrt6stat.mrt6s_upcalls++; 1565 1566 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1567 #ifdef MRT6DEBUG 1568 if (mrt6debug) 1569 log(LOG_WARNING, 1570 "register_send: ip6_mrouter socket queue full\n"); 1571 #endif 1572 ++mrt6stat.mrt6s_upq_sockfull; 1573 return ENOBUFS; 1574 } 1575 return 0; 1576 } 1577 1578 /* 1579 * PIM sparse mode hook 1580 * Receives the pim control messages, and passes them up to the listening 1581 * socket, using rip6_input. 1582 * The only message processed is the REGISTER pim message; the pim header 1583 * is stripped off, and the inner packet is passed to register_mforward. 1584 */ 1585 int 1586 pim6_input(mp, offp, proto) 1587 struct mbuf **mp; 1588 int *offp, proto; 1589 { 1590 struct pim *pim; /* pointer to a pim struct */ 1591 struct ip6_hdr *ip6; 1592 int pimlen; 1593 struct mbuf *m = *mp; 1594 int minlen; 1595 int off = *offp; 1596 1597 ++pim6stat.pim6s_rcv_total; 1598 1599 ip6 = mtod(m, struct ip6_hdr *); 1600 pimlen = m->m_pkthdr.len - *offp; 1601 1602 /* 1603 * Validate lengths 1604 */ 1605 if (pimlen < PIM_MINLEN) { 1606 ++pim6stat.pim6s_rcv_tooshort; 1607 #ifdef MRT6DEBUG 1608 if (mrt6debug & DEBUG_PIM) 1609 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1610 #endif 1611 m_freem(m); 1612 return (IPPROTO_DONE); 1613 } 1614 1615 /* 1616 * if the packet is at least as big as a REGISTER, go ahead 1617 * and grab the PIM REGISTER header size, to avoid another 1618 * possible m_pullup() later. 1619 * 1620 * PIM_MINLEN == pimhdr + u_int32 == 8 1621 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1622 */ 1623 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1624 1625 /* 1626 * Make sure that the IP6 and PIM headers in contiguous memory, and 1627 * possibly the PIM REGISTER header 1628 */ 1629 #ifndef PULLDOWN_TEST 1630 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1631 /* adjust pointer */ 1632 ip6 = mtod(m, struct ip6_hdr *); 1633 1634 /* adjust mbuf to point to the PIM header */ 1635 pim = (struct pim *)((caddr_t)ip6 + off); 1636 #else 1637 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1638 if (pim == NULL) { 1639 pim6stat.pim6s_rcv_tooshort++; 1640 return IPPROTO_DONE; 1641 } 1642 #endif 1643 1644 #define PIM6_CHECKSUM 1645 #ifdef PIM6_CHECKSUM 1646 { 1647 int cksumlen; 1648 1649 /* 1650 * Validate checksum. 1651 * If PIM REGISTER, exclude the data packet 1652 */ 1653 if (pim->pim_type == PIM_REGISTER) 1654 cksumlen = PIM_MINLEN; 1655 else 1656 cksumlen = pimlen; 1657 1658 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1659 ++pim6stat.pim6s_rcv_badsum; 1660 #ifdef MRT6DEBUG 1661 if (mrt6debug & DEBUG_PIM) 1662 log(LOG_DEBUG, 1663 "pim6_input: invalid checksum\n"); 1664 #endif 1665 m_freem(m); 1666 return (IPPROTO_DONE); 1667 } 1668 } 1669 #endif /* PIM_CHECKSUM */ 1670 1671 /* PIM version check */ 1672 if (pim->pim_ver != PIM_VERSION) { 1673 ++pim6stat.pim6s_rcv_badversion; 1674 #ifdef MRT6DEBUG 1675 log(LOG_ERR, 1676 "pim6_input: incorrect version %d, expecting %d\n", 1677 pim->pim_ver, PIM_VERSION); 1678 #endif 1679 m_freem(m); 1680 return (IPPROTO_DONE); 1681 } 1682 1683 if (pim->pim_type == PIM_REGISTER) { 1684 /* 1685 * since this is a REGISTER, we'll make a copy of the register 1686 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1687 * routing daemon. 1688 */ 1689 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1690 1691 struct mbuf *mcp; 1692 struct ip6_hdr *eip6; 1693 u_int32_t *reghdr; 1694 int rc; 1695 1696 ++pim6stat.pim6s_rcv_registers; 1697 1698 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1699 #ifdef MRT6DEBUG 1700 if (mrt6debug & DEBUG_PIM) 1701 log(LOG_DEBUG, 1702 "pim6_input: register mif not set: %d\n", 1703 reg_mif_num); 1704 #endif 1705 m_freem(m); 1706 return (IPPROTO_DONE); 1707 } 1708 1709 reghdr = (u_int32_t *)(pim + 1); 1710 1711 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1712 goto pim6_input_to_daemon; 1713 1714 /* 1715 * Validate length 1716 */ 1717 if (pimlen < PIM6_REG_MINLEN) { 1718 ++pim6stat.pim6s_rcv_tooshort; 1719 ++pim6stat.pim6s_rcv_badregisters; 1720 #ifdef MRT6DEBUG 1721 log(LOG_ERR, 1722 "pim6_input: register packet size too " 1723 "small %d from %s\n", 1724 pimlen, ip6_sprintf(&ip6->ip6_src)); 1725 #endif 1726 m_freem(m); 1727 return (IPPROTO_DONE); 1728 } 1729 1730 eip6 = (struct ip6_hdr *) (reghdr + 1); 1731 #ifdef MRT6DEBUG 1732 if (mrt6debug & DEBUG_PIM) 1733 log(LOG_DEBUG, 1734 "pim6_input[register], eip6: %s -> %s, " 1735 "eip6 plen %d\n", 1736 ip6_sprintf(&eip6->ip6_src), 1737 ip6_sprintf(&eip6->ip6_dst), 1738 ntohs(eip6->ip6_plen)); 1739 #endif 1740 1741 /* verify the version number of the inner packet */ 1742 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1743 ++pim6stat.pim6s_rcv_badregisters; 1744 #ifdef MRT6DEBUG 1745 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1746 "of the inner packet\n", 1747 (eip6->ip6_vfc & IPV6_VERSION)); 1748 #endif 1749 m_freem(m); 1750 return (IPPROTO_NONE); 1751 } 1752 1753 /* verify the inner packet is destined to a mcast group */ 1754 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1755 ++pim6stat.pim6s_rcv_badregisters; 1756 #ifdef MRT6DEBUG 1757 if (mrt6debug & DEBUG_PIM) 1758 log(LOG_DEBUG, 1759 "pim6_input: inner packet of register " 1760 "is not multicast %s\n", 1761 ip6_sprintf(&eip6->ip6_dst)); 1762 #endif 1763 m_freem(m); 1764 return (IPPROTO_DONE); 1765 } 1766 1767 /* 1768 * make a copy of the whole header to pass to the daemon later. 1769 */ 1770 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1771 if (mcp == NULL) { 1772 #ifdef MRT6DEBUG 1773 log(LOG_ERR, 1774 "pim6_input: pim register: " 1775 "could not copy register head\n"); 1776 #endif 1777 m_freem(m); 1778 return (IPPROTO_DONE); 1779 } 1780 1781 /* 1782 * forward the inner ip6 packet; point m_data at the inner ip6. 1783 */ 1784 m_adj(m, off + PIM_MINLEN); 1785 #ifdef MRT6DEBUG 1786 if (mrt6debug & DEBUG_PIM) { 1787 log(LOG_DEBUG, 1788 "pim6_input: forwarding decapsulated register: " 1789 "src %s, dst %s, mif %d\n", 1790 ip6_sprintf(&eip6->ip6_src), 1791 ip6_sprintf(&eip6->ip6_dst), 1792 reg_mif_num); 1793 } 1794 #endif 1795 1796 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1797 (struct sockaddr *) &dst, 1798 (struct rtentry *) NULL); 1799 1800 /* prepare the register head to send to the mrouting daemon */ 1801 m = mcp; 1802 } 1803 1804 /* 1805 * Pass the PIM message up to the daemon; if it is a register message 1806 * pass the 'head' only up to the daemon. This includes the 1807 * encapsulator ip6 header, pim header, register header and the 1808 * encapsulated ip6 header. 1809 */ 1810 pim6_input_to_daemon: 1811 rip6_input(&m, offp, proto); 1812 return (IPPROTO_DONE); 1813 } 1814
Indexes created Wed Sep 24 14:09:57 GMT 2025