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sys/netinet6/ip6_mroute.c
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1 /* $FreeBSD$ */ 2 /* $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun 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 Fenenr, PARC, April 1994 44 * 45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 46 */ 47 48 #include "opt_inet.h" 49 #include "opt_inet6.h" 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/callout.h> 54 #include <sys/malloc.h> 55 #include <sys/mbuf.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sockio.h> 59 #include <sys/protosw.h> 60 #include <sys/errno.h> 61 #include <sys/time.h> 62 #include <sys/kernel.h> 63 #include <sys/syslog.h> 64 65 #include <net/if.h> 66 #include <net/route.h> 67 #include <net/raw_cb.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_var.h> 71 72 #include <netinet/ip6.h> 73 #include <netinet6/ip6_var.h> 74 #include <netinet6/ip6_mroute.h> 75 #include <netinet6/pim6.h> 76 #include <netinet6/pim6_var.h> 77 78 #include <net/net_osdep.h> 79 80 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry"); 81 82 #define M_HASCL(m) ((m)->m_flags & M_EXT) 83 84 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 85 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 86 87 static int set_pim6 __P((int *)); 88 static int socket_send __P((struct socket *, struct mbuf *, 89 struct sockaddr_in6 *)); 90 static int register_send __P((struct ip6_hdr *, struct mif6 *, 91 struct mbuf *)); 92 93 /* 94 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 95 * except for netstat or debugging purposes. 96 */ 97 struct socket *ip6_mrouter = NULL; 98 int ip6_mrouter_ver = 0; 99 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 100 struct mrt6stat mrt6stat; 101 102 #define NO_RTE_FOUND 0x1 103 #define RTE_FOUND 0x2 104 105 struct mf6c *mf6ctable[MF6CTBLSIZ]; 106 u_char n6expire[MF6CTBLSIZ]; 107 static struct mif6 mif6table[MAXMIFS]; 108 #ifdef MRT6DEBUG 109 u_int mrt6debug = 0; /* debug level */ 110 #define DEBUG_MFC 0x02 111 #define DEBUG_FORWARD 0x04 112 #define DEBUG_EXPIRE 0x08 113 #define DEBUG_XMIT 0x10 114 #define DEBUG_REG 0x20 115 #define DEBUG_PIM 0x40 116 #endif 117 118 static void expire_upcalls __P((void *)); 119 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 120 #define UPCALL_EXPIRE 6 /* number of timeouts */ 121 122 #ifdef INET 123 #ifdef MROUTING 124 extern struct socket *ip_mrouter; 125 #endif 126 #endif 127 128 /* 129 * 'Interfaces' associated with decapsulator (so we can tell 130 * packets that went through it from ones that get reflected 131 * by a broken gateway). These interfaces are never linked into 132 * the system ifnet list & no routes point to them. I.e., packets 133 * can't be sent this way. They only exist as a placeholder for 134 * multicast source verification. 135 */ 136 struct ifnet multicast_register_if; 137 138 #define ENCAP_HOPS 64 139 140 /* 141 * Private variables. 142 */ 143 static mifi_t nummifs = 0; 144 static mifi_t reg_mif_num = (mifi_t)-1; 145 146 static struct pim6stat pim6stat; 147 static int pim6; 148 149 /* 150 * Hash function for a source, group entry 151 */ 152 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 153 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 154 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 155 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 156 157 /* 158 * Find a route for a given origin IPv6 address and Multicast group address. 159 * Quality of service parameter to be added in the future!!! 160 */ 161 162 #define MF6CFIND(o, g, rt) do { \ 163 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 164 rt = NULL; \ 165 mrt6stat.mrt6s_mfc_lookups++; \ 166 while (_rt) { \ 167 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 168 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 169 (_rt->mf6c_stall == NULL)) { \ 170 rt = _rt; \ 171 break; \ 172 } \ 173 _rt = _rt->mf6c_next; \ 174 } \ 175 if (rt == NULL) { \ 176 mrt6stat.mrt6s_mfc_misses++; \ 177 } \ 178 } while (0) 179 180 /* 181 * Macros to compute elapsed time efficiently 182 * Borrowed from Van Jacobson's scheduling code 183 */ 184 #define TV_DELTA(a, b, delta) do { \ 185 int xxs; \ 186 \ 187 delta = (a).tv_usec - (b).tv_usec; \ 188 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 189 switch (xxs) { \ 190 case 2: \ 191 delta += 1000000; \ 192 /* fall through */ \ 193 case 1: \ 194 delta += 1000000; \ 195 break; \ 196 default: \ 197 delta += (1000000 * xxs); \ 198 } \ 199 } \ 200 } while (0) 201 202 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 203 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 204 205 #ifdef UPCALL_TIMING 206 #define UPCALL_MAX 50 207 u_long upcall_data[UPCALL_MAX + 1]; 208 static void collate(); 209 #endif /* UPCALL_TIMING */ 210 211 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 212 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 213 static int ip6_mrouter_init __P((struct socket *, int, int)); 214 static int add_m6if __P((struct mif6ctl *)); 215 static int del_m6if __P((mifi_t *)); 216 static int add_m6fc __P((struct mf6cctl *)); 217 static int del_m6fc __P((struct mf6cctl *)); 218 219 static struct callout expire_upcalls_ch; 220 221 /* 222 * Handle MRT setsockopt commands to modify the multicast routing tables. 223 */ 224 int 225 ip6_mrouter_set(so, sopt) 226 struct socket *so; 227 struct sockopt *sopt; 228 { 229 int error = 0; 230 int optval; 231 struct mif6ctl mifc; 232 struct mf6cctl mfcc; 233 mifi_t mifi; 234 235 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 236 return (EACCES); 237 238 switch (sopt->sopt_name) { 239 case MRT6_INIT: 240 #ifdef MRT6_OINIT 241 case MRT6_OINIT: 242 #endif 243 error = sooptcopyin(sopt, &optval, sizeof(optval), 244 sizeof(optval)); 245 if (error) 246 break; 247 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 248 break; 249 case MRT6_DONE: 250 error = ip6_mrouter_done(); 251 break; 252 case MRT6_ADD_MIF: 253 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 254 if (error) 255 break; 256 error = add_m6if(&mifc); 257 break; 258 case MRT6_ADD_MFC: 259 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 260 if (error) 261 break; 262 error = add_m6fc(&mfcc); 263 break; 264 case MRT6_DEL_MFC: 265 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 266 if (error) 267 break; 268 error = del_m6fc(&mfcc); 269 break; 270 case MRT6_DEL_MIF: 271 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 272 if (error) 273 break; 274 error = del_m6if(&mifi); 275 break; 276 case MRT6_PIM: 277 error = sooptcopyin(sopt, &optval, sizeof(optval), 278 sizeof(optval)); 279 if (error) 280 break; 281 error = set_pim6(&optval); 282 break; 283 default: 284 error = EOPNOTSUPP; 285 break; 286 } 287 288 return(error); 289 } 290 291 /* 292 * Handle MRT getsockopt commands 293 */ 294 int 295 ip6_mrouter_get(so, sopt) 296 struct socket *so; 297 struct sockopt *sopt; 298 { 299 int error = 0; 300 301 if (so != ip6_mrouter) return EACCES; 302 303 switch (sopt->sopt_name) { 304 case MRT6_PIM: 305 error = sooptcopyout(sopt, &pim6, sizeof(pim6)); 306 break; 307 } 308 return (error); 309 } 310 311 /* 312 * Handle ioctl commands to obtain information from the cache 313 */ 314 int 315 mrt6_ioctl(cmd, data) 316 int cmd; 317 caddr_t data; 318 { 319 int error = 0; 320 321 switch (cmd) { 322 case SIOCGETSGCNT_IN6: 323 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 324 break; /* for safety */ 325 case SIOCGETMIFCNT_IN6: 326 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 327 break; /* for safety */ 328 default: 329 return (EINVAL); 330 break; 331 } 332 return error; 333 } 334 335 /* 336 * returns the packet, byte, rpf-failure count for the source group provided 337 */ 338 static int 339 get_sg_cnt(req) 340 struct sioc_sg_req6 *req; 341 { 342 struct mf6c *rt; 343 int s; 344 345 s = splnet(); 346 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 347 splx(s); 348 if (rt != NULL) { 349 req->pktcnt = rt->mf6c_pkt_cnt; 350 req->bytecnt = rt->mf6c_byte_cnt; 351 req->wrong_if = rt->mf6c_wrong_if; 352 } else 353 return(ESRCH); 354 #if 0 355 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 356 #endif 357 358 return 0; 359 } 360 361 /* 362 * returns the input and output packet and byte counts on the mif provided 363 */ 364 static int 365 get_mif6_cnt(req) 366 struct sioc_mif_req6 *req; 367 { 368 mifi_t mifi = req->mifi; 369 370 if (mifi >= nummifs) 371 return EINVAL; 372 373 req->icount = mif6table[mifi].m6_pkt_in; 374 req->ocount = mif6table[mifi].m6_pkt_out; 375 req->ibytes = mif6table[mifi].m6_bytes_in; 376 req->obytes = mif6table[mifi].m6_bytes_out; 377 378 return 0; 379 } 380 381 static int 382 set_pim6(i) 383 int *i; 384 { 385 if ((*i != 1) && (*i != 0)) 386 return EINVAL; 387 388 pim6 = *i; 389 390 return 0; 391 } 392 393 /* 394 * Enable multicast routing 395 */ 396 static int 397 ip6_mrouter_init(so, v, cmd) 398 struct socket *so; 399 int v; 400 int cmd; 401 { 402 #ifdef MRT6DEBUG 403 if (mrt6debug) 404 log(LOG_DEBUG, 405 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 406 so->so_type, so->so_proto->pr_protocol); 407 #endif 408 409 if (so->so_type != SOCK_RAW || 410 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 411 return EOPNOTSUPP; 412 413 if (v != 1) 414 return ENOPROTOOPT; 415 416 if (ip6_mrouter != NULL) return EADDRINUSE; 417 418 ip6_mrouter = so; 419 ip6_mrouter_ver = cmd; 420 421 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 422 bzero((caddr_t)n6expire, sizeof(n6expire)); 423 424 pim6 = 0;/* used for stubbing out/in pim stuff */ 425 426 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 427 expire_upcalls, NULL); 428 429 #ifdef MRT6DEBUG 430 if (mrt6debug) 431 log(LOG_DEBUG, "ip6_mrouter_init\n"); 432 #endif 433 434 return 0; 435 } 436 437 /* 438 * Disable multicast routing 439 */ 440 int 441 ip6_mrouter_done() 442 { 443 mifi_t mifi; 444 int i; 445 struct ifnet *ifp; 446 struct in6_ifreq ifr; 447 struct mf6c *rt; 448 struct rtdetq *rte; 449 int s; 450 451 s = splnet(); 452 453 /* 454 * For each phyint in use, disable promiscuous reception of all IPv6 455 * multicasts. 456 */ 457 #ifdef INET 458 #ifdef MROUTING 459 /* 460 * If there is still IPv4 multicast routing daemon, 461 * we remain interfaces to receive all muliticasted packets. 462 * XXX: there may be an interface in which the IPv4 multicast 463 * daemon is not interested... 464 */ 465 if (!ip_mrouter) 466 #endif 467 #endif 468 { 469 for (mifi = 0; mifi < nummifs; mifi++) { 470 if (mif6table[mifi].m6_ifp && 471 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 472 ifr.ifr_addr.sin6_family = AF_INET6; 473 ifr.ifr_addr.sin6_addr= in6addr_any; 474 ifp = mif6table[mifi].m6_ifp; 475 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 476 (caddr_t)&ifr); 477 } 478 } 479 } 480 #ifdef notyet 481 bzero((caddr_t)qtable, sizeof(qtable)); 482 bzero((caddr_t)tbftable, sizeof(tbftable)); 483 #endif 484 bzero((caddr_t)mif6table, sizeof(mif6table)); 485 nummifs = 0; 486 487 pim6 = 0; /* used to stub out/in pim specific code */ 488 489 callout_stop(&expire_upcalls_ch); 490 491 /* 492 * Free all multicast forwarding cache entries. 493 */ 494 for (i = 0; i < MF6CTBLSIZ; i++) { 495 rt = mf6ctable[i]; 496 while (rt) { 497 struct mf6c *frt; 498 499 for (rte = rt->mf6c_stall; rte != NULL; ) { 500 struct rtdetq *n = rte->next; 501 502 m_free(rte->m); 503 free(rte, M_MRTABLE); 504 rte = n; 505 } 506 frt = rt; 507 rt = rt->mf6c_next; 508 free(frt, M_MRTABLE); 509 } 510 } 511 512 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 513 514 /* 515 * Reset de-encapsulation cache 516 */ 517 reg_mif_num = -1; 518 519 ip6_mrouter = NULL; 520 ip6_mrouter_ver = 0; 521 522 splx(s); 523 524 #ifdef MRT6DEBUG 525 if (mrt6debug) 526 log(LOG_DEBUG, "ip6_mrouter_done\n"); 527 #endif 528 529 return 0; 530 } 531 532 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 533 534 /* 535 * Add a mif to the mif table 536 */ 537 static int 538 add_m6if(mifcp) 539 struct mif6ctl *mifcp; 540 { 541 struct mif6 *mifp; 542 struct ifnet *ifp; 543 int error, s; 544 #ifdef notyet 545 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 546 #endif 547 548 if (mifcp->mif6c_mifi >= MAXMIFS) 549 return EINVAL; 550 mifp = mif6table + mifcp->mif6c_mifi; 551 if (mifp->m6_ifp) 552 return EADDRINUSE; /* XXX: is it appropriate? */ 553 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 554 return ENXIO; 555 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 556 557 if (mifcp->mif6c_flags & MIFF_REGISTER) { 558 if (reg_mif_num == (mifi_t)-1) { 559 multicast_register_if.if_name = "register_mif"; 560 multicast_register_if.if_flags |= IFF_LOOPBACK; 561 multicast_register_if.if_index = mifcp->mif6c_mifi; 562 reg_mif_num = mifcp->mif6c_mifi; 563 } 564 565 ifp = &multicast_register_if; 566 567 } /* if REGISTER */ 568 else { 569 /* Make sure the interface supports multicast */ 570 if ((ifp->if_flags & IFF_MULTICAST) == 0) 571 return EOPNOTSUPP; 572 573 s = splnet(); 574 error = if_allmulti(ifp, 1); 575 splx(s); 576 if (error) 577 return error; 578 } 579 580 s = splnet(); 581 mifp->m6_flags = mifcp->mif6c_flags; 582 mifp->m6_ifp = ifp; 583 #ifdef notyet 584 /* scaling up here allows division by 1024 in critical code */ 585 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 586 #endif 587 /* initialize per mif pkt counters */ 588 mifp->m6_pkt_in = 0; 589 mifp->m6_pkt_out = 0; 590 mifp->m6_bytes_in = 0; 591 mifp->m6_bytes_out = 0; 592 splx(s); 593 594 /* Adjust nummifs up if the mifi is higher than nummifs */ 595 if (nummifs <= mifcp->mif6c_mifi) 596 nummifs = mifcp->mif6c_mifi + 1; 597 598 #ifdef MRT6DEBUG 599 if (mrt6debug) 600 log(LOG_DEBUG, 601 "add_mif #%d, phyint %s%d\n", 602 mifcp->mif6c_mifi, 603 ifp->if_name, ifp->if_unit); 604 #endif 605 606 return 0; 607 } 608 609 /* 610 * Delete a mif from the mif table 611 */ 612 static int 613 del_m6if(mifip) 614 mifi_t *mifip; 615 { 616 struct mif6 *mifp = mif6table + *mifip; 617 mifi_t mifi; 618 struct ifnet *ifp; 619 int s; 620 621 if (*mifip >= nummifs) 622 return EINVAL; 623 if (mifp->m6_ifp == NULL) 624 return EINVAL; 625 626 s = splnet(); 627 628 if (!(mifp->m6_flags & MIFF_REGISTER)) { 629 /* 630 * XXX: what if there is yet IPv4 multicast daemon 631 * using the interface? 632 */ 633 ifp = mifp->m6_ifp; 634 635 if_allmulti(ifp, 0); 636 } 637 638 #ifdef notyet 639 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 640 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 641 #endif 642 bzero((caddr_t)mifp, sizeof(*mifp)); 643 644 /* Adjust nummifs down */ 645 for (mifi = nummifs; mifi > 0; mifi--) 646 if (mif6table[mifi - 1].m6_ifp) 647 break; 648 nummifs = mifi; 649 650 splx(s); 651 652 #ifdef MRT6DEBUG 653 if (mrt6debug) 654 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 655 #endif 656 657 return 0; 658 } 659 660 /* 661 * Add an mfc entry 662 */ 663 static int 664 add_m6fc(mfccp) 665 struct mf6cctl *mfccp; 666 { 667 struct mf6c *rt; 668 u_long hash; 669 struct rtdetq *rte; 670 u_short nstl; 671 int s; 672 673 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 674 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 675 676 /* If an entry already exists, just update the fields */ 677 if (rt) { 678 #ifdef MRT6DEBUG 679 if (mrt6debug & DEBUG_MFC) 680 log(LOG_DEBUG, 681 "add_m6fc no upcall h %d 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 = splnet(); 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 = splnet(); 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,"add_mfc no upcall h %d o %s g %s p %x\n", 758 hash, 759 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 760 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 761 mfccp->mf6cc_parent); 762 #endif 763 764 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 765 766 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 767 &mfccp->mf6cc_origin.sin6_addr)&& 768 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 769 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 770 771 rt->mf6c_origin = mfccp->mf6cc_origin; 772 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 773 rt->mf6c_parent = mfccp->mf6cc_parent; 774 rt->mf6c_ifset = mfccp->mf6cc_ifset; 775 /* initialize pkt counters per src-grp */ 776 rt->mf6c_pkt_cnt = 0; 777 rt->mf6c_byte_cnt = 0; 778 rt->mf6c_wrong_if = 0; 779 780 if (rt->mf6c_expire) 781 n6expire[hash]--; 782 rt->mf6c_expire = 0; 783 } 784 } 785 if (rt == NULL) { 786 /* no upcall, so make a new entry */ 787 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 788 M_NOWAIT); 789 if (rt == NULL) { 790 splx(s); 791 return ENOBUFS; 792 } 793 794 /* insert new entry at head of hash chain */ 795 rt->mf6c_origin = mfccp->mf6cc_origin; 796 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 797 rt->mf6c_parent = mfccp->mf6cc_parent; 798 rt->mf6c_ifset = mfccp->mf6cc_ifset; 799 /* initialize pkt counters per src-grp */ 800 rt->mf6c_pkt_cnt = 0; 801 rt->mf6c_byte_cnt = 0; 802 rt->mf6c_wrong_if = 0; 803 rt->mf6c_expire = 0; 804 rt->mf6c_stall = NULL; 805 806 /* link into table */ 807 rt->mf6c_next = mf6ctable[hash]; 808 mf6ctable[hash] = rt; 809 } 810 } 811 splx(s); 812 return 0; 813 } 814 815 #ifdef UPCALL_TIMING 816 /* 817 * collect delay statistics on the upcalls 818 */ 819 static void 820 collate(t) 821 struct timeval *t; 822 { 823 u_long d; 824 struct timeval tp; 825 u_long delta; 826 827 GET_TIME(tp); 828 829 if (TV_LT(*t, tp)) 830 { 831 TV_DELTA(tp, *t, delta); 832 833 d = delta >> 10; 834 if (d > UPCALL_MAX) 835 d = UPCALL_MAX; 836 837 ++upcall_data[d]; 838 } 839 } 840 #endif /* UPCALL_TIMING */ 841 842 /* 843 * Delete an mfc entry 844 */ 845 static int 846 del_m6fc(mfccp) 847 struct mf6cctl *mfccp; 848 { 849 struct sockaddr_in6 origin; 850 struct sockaddr_in6 mcastgrp; 851 struct mf6c *rt; 852 struct mf6c **nptr; 853 u_long hash; 854 int s; 855 856 origin = mfccp->mf6cc_origin; 857 mcastgrp = mfccp->mf6cc_mcastgrp; 858 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 859 860 #ifdef MRT6DEBUG 861 if (mrt6debug & DEBUG_MFC) 862 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 863 ip6_sprintf(&origin.sin6_addr), 864 ip6_sprintf(&mcastgrp.sin6_addr)); 865 #endif 866 867 s = splnet(); 868 869 nptr = &mf6ctable[hash]; 870 while ((rt = *nptr) != NULL) { 871 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 872 &rt->mf6c_origin.sin6_addr) && 873 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 874 &rt->mf6c_mcastgrp.sin6_addr) && 875 rt->mf6c_stall == NULL) 876 break; 877 878 nptr = &rt->mf6c_next; 879 } 880 if (rt == NULL) { 881 splx(s); 882 return EADDRNOTAVAIL; 883 } 884 885 *nptr = rt->mf6c_next; 886 free(rt, M_MRTABLE); 887 888 splx(s); 889 890 return 0; 891 } 892 893 static int 894 socket_send(s, mm, src) 895 struct socket *s; 896 struct mbuf *mm; 897 struct sockaddr_in6 *src; 898 { 899 if (s) { 900 if (sbappendaddr(&s->so_rcv, 901 (struct sockaddr *)src, 902 mm, (struct mbuf *)0) != 0) { 903 sorwakeup(s); 904 return 0; 905 } 906 } 907 m_freem(mm); 908 return -1; 909 } 910 911 /* 912 * IPv6 multicast forwarding function. This function assumes that the packet 913 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 914 * pointed to by "ifp", and the packet is to be relayed to other networks 915 * that have members of the packet's destination IPv6 multicast group. 916 * 917 * The packet is returned unscathed to the caller, unless it is 918 * erroneous, in which case a non-zero return value tells the caller to 919 * discard it. 920 */ 921 922 int 923 ip6_mforward(ip6, ifp, m) 924 struct ip6_hdr *ip6; 925 struct ifnet *ifp; 926 struct mbuf *m; 927 { 928 struct mf6c *rt; 929 struct mif6 *mifp; 930 struct mbuf *mm; 931 int s; 932 mifi_t mifi; 933 934 #ifdef MRT6DEBUG 935 if (mrt6debug & DEBUG_FORWARD) 936 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 937 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 938 ifp->if_index); 939 #endif 940 941 /* 942 * Don't forward a packet with Hop limit of zero or one, 943 * or a packet destined to a local-only group. 944 */ 945 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 946 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 947 return 0; 948 ip6->ip6_hlim--; 949 950 /* 951 * Source address check: do not forward packets with unspecified 952 * source. It was discussed in July 2000, on ipngwg mailing list. 953 * This is rather more serious than unicast cases, because some 954 * MLD packets can be sent with the unspecified source address 955 * (although such packets must normally set 1 to the hop limit field). 956 */ 957 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 958 ip6stat.ip6s_cantforward++; 959 if (ip6_log_time + ip6_log_interval < time_second) { 960 ip6_log_time = time_second; 961 log(LOG_DEBUG, 962 "cannot forward " 963 "from %s to %s nxt %d received on %s\n", 964 ip6_sprintf(&ip6->ip6_src), 965 ip6_sprintf(&ip6->ip6_dst), 966 ip6->ip6_nxt, 967 if_name(m->m_pkthdr.rcvif)); 968 } 969 return 0; 970 } 971 972 /* 973 * Determine forwarding mifs from the forwarding cache table 974 */ 975 s = splnet(); 976 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 977 978 /* Entry exists, so forward if necessary */ 979 if (rt) { 980 splx(s); 981 return (ip6_mdq(m, ifp, rt)); 982 } else { 983 /* 984 * If we don't have a route for packet's origin, 985 * Make a copy of the packet & 986 * send message to routing daemon 987 */ 988 989 struct mbuf *mb0; 990 struct rtdetq *rte; 991 u_long hash; 992 /* int i, npkts;*/ 993 #ifdef UPCALL_TIMING 994 struct timeval tp; 995 996 GET_TIME(tp); 997 #endif /* UPCALL_TIMING */ 998 999 mrt6stat.mrt6s_no_route++; 1000 #ifdef MRT6DEBUG 1001 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1002 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1003 ip6_sprintf(&ip6->ip6_src), 1004 ip6_sprintf(&ip6->ip6_dst)); 1005 #endif 1006 1007 /* 1008 * Allocate mbufs early so that we don't do extra work if we 1009 * are just going to fail anyway. 1010 */ 1011 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1012 M_NOWAIT); 1013 if (rte == NULL) { 1014 splx(s); 1015 return ENOBUFS; 1016 } 1017 mb0 = m_copy(m, 0, M_COPYALL); 1018 /* 1019 * Pullup packet header if needed before storing it, 1020 * as other references may modify it in the meantime. 1021 */ 1022 if (mb0 && 1023 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1024 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1025 if (mb0 == NULL) { 1026 free(rte, M_MRTABLE); 1027 splx(s); 1028 return ENOBUFS; 1029 } 1030 1031 /* is there an upcall waiting for this packet? */ 1032 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1033 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1034 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1035 &rt->mf6c_origin.sin6_addr) && 1036 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1037 &rt->mf6c_mcastgrp.sin6_addr) && 1038 (rt->mf6c_stall != NULL)) 1039 break; 1040 } 1041 1042 if (rt == NULL) { 1043 struct mrt6msg *im; 1044 #ifdef MRT6_OINIT 1045 struct omrt6msg *oim; 1046 #endif 1047 1048 /* no upcall, so make a new entry */ 1049 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1050 M_NOWAIT); 1051 if (rt == NULL) { 1052 free(rte, M_MRTABLE); 1053 m_freem(mb0); 1054 splx(s); 1055 return ENOBUFS; 1056 } 1057 /* 1058 * Make a copy of the header to send to the user 1059 * level process 1060 */ 1061 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1062 1063 if (mm == NULL) { 1064 free(rte, M_MRTABLE); 1065 m_freem(mb0); 1066 free(rt, M_MRTABLE); 1067 splx(s); 1068 return ENOBUFS; 1069 } 1070 1071 /* 1072 * Send message to routing daemon 1073 */ 1074 sin6.sin6_addr = ip6->ip6_src; 1075 1076 im = NULL; 1077 #ifdef MRT6_OINIT 1078 oim = NULL; 1079 #endif 1080 switch (ip6_mrouter_ver) { 1081 #ifdef MRT6_OINIT 1082 case MRT6_OINIT: 1083 oim = mtod(mm, struct omrt6msg *); 1084 oim->im6_msgtype = MRT6MSG_NOCACHE; 1085 oim->im6_mbz = 0; 1086 break; 1087 #endif 1088 case MRT6_INIT: 1089 im = mtod(mm, struct mrt6msg *); 1090 im->im6_msgtype = MRT6MSG_NOCACHE; 1091 im->im6_mbz = 0; 1092 break; 1093 default: 1094 free(rte, M_MRTABLE); 1095 m_freem(mb0); 1096 free(rt, M_MRTABLE); 1097 splx(s); 1098 return EINVAL; 1099 } 1100 1101 #ifdef MRT6DEBUG 1102 if (mrt6debug & DEBUG_FORWARD) 1103 log(LOG_DEBUG, 1104 "getting the iif info in the kernel\n"); 1105 #endif 1106 1107 for (mifp = mif6table, mifi = 0; 1108 mifi < nummifs && mifp->m6_ifp != ifp; 1109 mifp++, mifi++) 1110 ; 1111 1112 switch (ip6_mrouter_ver) { 1113 #ifdef MRT6_OINIT 1114 case MRT6_OINIT: 1115 oim->im6_mif = mifi; 1116 break; 1117 #endif 1118 case MRT6_INIT: 1119 im->im6_mif = mifi; 1120 break; 1121 } 1122 1123 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1124 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1125 "socket queue full\n"); 1126 mrt6stat.mrt6s_upq_sockfull++; 1127 free(rte, M_MRTABLE); 1128 m_freem(mb0); 1129 free(rt, M_MRTABLE); 1130 splx(s); 1131 return ENOBUFS; 1132 } 1133 1134 mrt6stat.mrt6s_upcalls++; 1135 1136 /* insert new entry at head of hash chain */ 1137 bzero(rt, sizeof(*rt)); 1138 rt->mf6c_origin.sin6_family = AF_INET6; 1139 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1140 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1141 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1142 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1143 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1144 rt->mf6c_expire = UPCALL_EXPIRE; 1145 n6expire[hash]++; 1146 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1147 1148 /* link into table */ 1149 rt->mf6c_next = mf6ctable[hash]; 1150 mf6ctable[hash] = rt; 1151 /* Add this entry to the end of the queue */ 1152 rt->mf6c_stall = rte; 1153 } else { 1154 /* determine if q has overflowed */ 1155 struct rtdetq **p; 1156 int npkts = 0; 1157 1158 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1159 if (++npkts > MAX_UPQ6) { 1160 mrt6stat.mrt6s_upq_ovflw++; 1161 free(rte, M_MRTABLE); 1162 m_freem(mb0); 1163 splx(s); 1164 return 0; 1165 } 1166 1167 /* Add this entry to the end of the queue */ 1168 *p = rte; 1169 } 1170 1171 rte->next = NULL; 1172 rte->m = mb0; 1173 rte->ifp = ifp; 1174 #ifdef UPCALL_TIMING 1175 rte->t = tp; 1176 #endif /* UPCALL_TIMING */ 1177 1178 splx(s); 1179 1180 return 0; 1181 } 1182 } 1183 1184 /* 1185 * Clean up cache entries if upcalls are not serviced 1186 * Call from the Slow Timeout mechanism, every half second. 1187 */ 1188 static void 1189 expire_upcalls(unused) 1190 void *unused; 1191 { 1192 struct rtdetq *rte; 1193 struct mf6c *mfc, **nptr; 1194 int i; 1195 int s; 1196 1197 s = splnet(); 1198 for (i = 0; i < MF6CTBLSIZ; i++) { 1199 if (n6expire[i] == 0) 1200 continue; 1201 nptr = &mf6ctable[i]; 1202 while ((mfc = *nptr) != NULL) { 1203 rte = mfc->mf6c_stall; 1204 /* 1205 * Skip real cache entries 1206 * Make sure it wasn't marked to not expire (shouldn't happen) 1207 * If it expires now 1208 */ 1209 if (rte != NULL && 1210 mfc->mf6c_expire != 0 && 1211 --mfc->mf6c_expire == 0) { 1212 #ifdef MRT6DEBUG 1213 if (mrt6debug & DEBUG_EXPIRE) 1214 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1215 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1216 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1217 #endif 1218 /* 1219 * drop all the packets 1220 * free the mbuf with the pkt, if, timing info 1221 */ 1222 do { 1223 struct rtdetq *n = rte->next; 1224 m_freem(rte->m); 1225 free(rte, M_MRTABLE); 1226 rte = n; 1227 } while (rte != NULL); 1228 mrt6stat.mrt6s_cache_cleanups++; 1229 n6expire[i]--; 1230 1231 *nptr = mfc->mf6c_next; 1232 free(mfc, M_MRTABLE); 1233 } else { 1234 nptr = &mfc->mf6c_next; 1235 } 1236 } 1237 } 1238 splx(s); 1239 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1240 expire_upcalls, NULL); 1241 } 1242 1243 /* 1244 * Packet forwarding routine once entry in the cache is made 1245 */ 1246 static int 1247 ip6_mdq(m, ifp, rt) 1248 struct mbuf *m; 1249 struct ifnet *ifp; 1250 struct mf6c *rt; 1251 { 1252 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1253 mifi_t mifi, iif; 1254 struct mif6 *mifp; 1255 int plen = m->m_pkthdr.len; 1256 1257 /* 1258 * Macro to send packet on mif. Since RSVP packets don't get counted on 1259 * input, they shouldn't get counted on output, so statistics keeping is 1260 * seperate. 1261 */ 1262 1263 #define MC6_SEND(ip6, mifp, m) do { \ 1264 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1265 register_send((ip6), (mifp), (m)); \ 1266 else \ 1267 phyint_send((ip6), (mifp), (m)); \ 1268 } while (0) 1269 1270 /* 1271 * Don't forward if it didn't arrive from the parent mif 1272 * for its origin. 1273 */ 1274 mifi = rt->mf6c_parent; 1275 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1276 /* came in the wrong interface */ 1277 #ifdef MRT6DEBUG 1278 if (mrt6debug & DEBUG_FORWARD) 1279 log(LOG_DEBUG, 1280 "wrong if: ifid %d mifi %d mififid %x\n", 1281 ifp->if_index, mifi, 1282 mif6table[mifi].m6_ifp->if_index); 1283 #endif 1284 mrt6stat.mrt6s_wrong_if++; 1285 rt->mf6c_wrong_if++; 1286 /* 1287 * If we are doing PIM processing, and we are forwarding 1288 * packets on this interface, send a message to the 1289 * routing daemon. 1290 */ 1291 /* have to make sure this is a valid mif */ 1292 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1293 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1294 /* 1295 * Check the M_LOOP flag to avoid an 1296 * unnecessary PIM assert. 1297 * XXX: M_LOOP is an ad-hoc hack... 1298 */ 1299 static struct sockaddr_in6 sin6 = 1300 { sizeof(sin6), AF_INET6 }; 1301 1302 struct mbuf *mm; 1303 struct mrt6msg *im; 1304 #ifdef MRT6_OINIT 1305 struct omrt6msg *oim; 1306 #endif 1307 1308 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1309 if (mm && 1310 (M_HASCL(mm) || 1311 mm->m_len < sizeof(struct ip6_hdr))) 1312 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1313 if (mm == NULL) 1314 return ENOBUFS; 1315 1316 #ifdef MRT6_OINIT 1317 oim = NULL; 1318 #endif 1319 im = NULL; 1320 switch (ip6_mrouter_ver) { 1321 #ifdef MRT6_OINIT 1322 case MRT6_OINIT: 1323 oim = mtod(mm, struct omrt6msg *); 1324 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1325 oim->im6_mbz = 0; 1326 break; 1327 #endif 1328 case MRT6_INIT: 1329 im = mtod(mm, struct mrt6msg *); 1330 im->im6_msgtype = MRT6MSG_WRONGMIF; 1331 im->im6_mbz = 0; 1332 break; 1333 default: 1334 m_freem(mm); 1335 return EINVAL; 1336 } 1337 1338 for (mifp = mif6table, iif = 0; 1339 iif < nummifs && mifp && 1340 mifp->m6_ifp != ifp; 1341 mifp++, iif++) 1342 ; 1343 1344 switch (ip6_mrouter_ver) { 1345 #ifdef MRT6_OINIT 1346 case MRT6_OINIT: 1347 oim->im6_mif = iif; 1348 sin6.sin6_addr = oim->im6_src; 1349 break; 1350 #endif 1351 case MRT6_INIT: 1352 im->im6_mif = iif; 1353 sin6.sin6_addr = im->im6_src; 1354 break; 1355 } 1356 1357 mrt6stat.mrt6s_upcalls++; 1358 1359 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1360 #ifdef MRT6DEBUG 1361 if (mrt6debug) 1362 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1363 #endif 1364 ++mrt6stat.mrt6s_upq_sockfull; 1365 return ENOBUFS; 1366 } /* if socket Q full */ 1367 } /* if PIM */ 1368 return 0; 1369 } /* if wrong iif */ 1370 1371 /* If I sourced this packet, it counts as output, else it was input. */ 1372 if (m->m_pkthdr.rcvif == NULL) { 1373 /* XXX: is rcvif really NULL when output?? */ 1374 mif6table[mifi].m6_pkt_out++; 1375 mif6table[mifi].m6_bytes_out += plen; 1376 } else { 1377 mif6table[mifi].m6_pkt_in++; 1378 mif6table[mifi].m6_bytes_in += plen; 1379 } 1380 rt->mf6c_pkt_cnt++; 1381 rt->mf6c_byte_cnt += plen; 1382 1383 /* 1384 * For each mif, forward a copy of the packet if there are group 1385 * members downstream on the interface. 1386 */ 1387 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1388 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1389 /* 1390 * check if the outgoing packet is going to break 1391 * a scope boundary. 1392 * XXX For packets through PIM register tunnel 1393 * interface, we believe a routing daemon. 1394 */ 1395 if ((mif6table[rt->mf6c_parent].m6_flags & 1396 MIFF_REGISTER) == 0 && 1397 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1398 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1399 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1400 &ip6->ip6_dst) || 1401 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1402 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1403 &ip6->ip6_src))) { 1404 ip6stat.ip6s_badscope++; 1405 continue; 1406 } 1407 1408 mifp->m6_pkt_out++; 1409 mifp->m6_bytes_out += plen; 1410 MC6_SEND(ip6, mifp, m); 1411 } 1412 return 0; 1413 } 1414 1415 static void 1416 phyint_send(ip6, mifp, m) 1417 struct ip6_hdr *ip6; 1418 struct mif6 *mifp; 1419 struct mbuf *m; 1420 { 1421 struct mbuf *mb_copy; 1422 struct ifnet *ifp = mifp->m6_ifp; 1423 int error = 0; 1424 int s = splnet(); /* needs to protect static "ro" below. */ 1425 static struct route_in6 ro; 1426 struct in6_multi *in6m; 1427 struct sockaddr_in6 *dst6; 1428 1429 /* 1430 * Make a new reference to the packet; make sure that 1431 * the IPv6 header is actually copied, not just referenced, 1432 * so that ip6_output() only scribbles on the copy. 1433 */ 1434 mb_copy = m_copy(m, 0, M_COPYALL); 1435 if (mb_copy && 1436 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1437 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1438 if (mb_copy == NULL) { 1439 splx(s); 1440 return; 1441 } 1442 /* set MCAST flag to the outgoing packet */ 1443 mb_copy->m_flags |= M_MCAST; 1444 1445 /* 1446 * If we sourced the packet, call ip6_output since we may devide 1447 * the packet into fragments when the packet is too big for the 1448 * outgoing interface. 1449 * Otherwise, we can simply send the packet to the interface 1450 * sending queue. 1451 */ 1452 if (m->m_pkthdr.rcvif == NULL) { 1453 struct ip6_moptions im6o; 1454 1455 im6o.im6o_multicast_ifp = ifp; 1456 /* XXX: ip6_output will override ip6->ip6_hlim */ 1457 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1458 im6o.im6o_multicast_loop = 1; 1459 error = ip6_output(mb_copy, NULL, &ro, 1460 IPV6_FORWARDING, &im6o, NULL, NULL); 1461 1462 #ifdef MRT6DEBUG 1463 if (mrt6debug & DEBUG_XMIT) 1464 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1465 mifp - mif6table, error); 1466 #endif 1467 splx(s); 1468 return; 1469 } 1470 1471 /* 1472 * If we belong to the destination multicast group 1473 * on the outgoing interface, loop back a copy. 1474 */ 1475 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1476 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1477 if (in6m != NULL) { 1478 dst6->sin6_len = sizeof(struct sockaddr_in6); 1479 dst6->sin6_family = AF_INET6; 1480 dst6->sin6_addr = ip6->ip6_dst; 1481 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1482 } 1483 /* 1484 * Put the packet into the sending queue of the outgoing interface 1485 * if it would fit in the MTU of the interface. 1486 */ 1487 if (mb_copy->m_pkthdr.len <= ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1488 dst6->sin6_len = sizeof(struct sockaddr_in6); 1489 dst6->sin6_family = AF_INET6; 1490 dst6->sin6_addr = ip6->ip6_dst; 1491 /* 1492 * We just call if_output instead of nd6_output here, since 1493 * we need no ND for a multicast forwarded packet...right? 1494 */ 1495 error = (*ifp->if_output)(ifp, mb_copy, 1496 (struct sockaddr *)&ro.ro_dst, NULL); 1497 #ifdef MRT6DEBUG 1498 if (mrt6debug & DEBUG_XMIT) 1499 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1500 mifp - mif6table, error); 1501 #endif 1502 } else { 1503 #ifdef MULTICAST_PMTUD 1504 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1505 #else 1506 #ifdef MRT6DEBUG 1507 if (mrt6debug & DEBUG_XMIT) 1508 log(LOG_DEBUG, 1509 "phyint_send: packet too big on %s o %s g %s" 1510 " size %d(discarded)\n", 1511 if_name(ifp), 1512 ip6_sprintf(&ip6->ip6_src), 1513 ip6_sprintf(&ip6->ip6_dst), 1514 mb_copy->m_pkthdr.len); 1515 #endif /* MRT6DEBUG */ 1516 m_freem(mb_copy); /* simply discard the packet */ 1517 #endif 1518 } 1519 1520 splx(s); 1521 } 1522 1523 static int 1524 register_send(ip6, mif, m) 1525 struct ip6_hdr *ip6; 1526 struct mif6 *mif; 1527 struct mbuf *m; 1528 { 1529 struct mbuf *mm; 1530 int i, len = m->m_pkthdr.len; 1531 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1532 struct mrt6msg *im6; 1533 1534 #ifdef MRT6DEBUG 1535 if (mrt6debug) 1536 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1537 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1538 #endif 1539 ++pim6stat.pim6s_snd_registers; 1540 1541 /* Make a copy of the packet to send to the user level process */ 1542 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1543 if (mm == NULL) 1544 return ENOBUFS; 1545 mm->m_pkthdr.rcvif = NULL; 1546 mm->m_data += max_linkhdr; 1547 mm->m_len = sizeof(struct ip6_hdr); 1548 1549 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1550 m_freem(mm); 1551 return ENOBUFS; 1552 } 1553 i = MHLEN - M_LEADINGSPACE(mm); 1554 if (i > len) 1555 i = len; 1556 mm = m_pullup(mm, i); 1557 if (mm == NULL) 1558 return ENOBUFS; 1559 /* TODO: check it! */ 1560 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1561 1562 /* 1563 * Send message to routing daemon 1564 */ 1565 sin6.sin6_addr = ip6->ip6_src; 1566 1567 im6 = mtod(mm, struct mrt6msg *); 1568 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1569 im6->im6_mbz = 0; 1570 1571 im6->im6_mif = mif - mif6table; 1572 1573 /* iif info is not given for reg. encap.n */ 1574 mrt6stat.mrt6s_upcalls++; 1575 1576 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1577 #ifdef MRT6DEBUG 1578 if (mrt6debug) 1579 log(LOG_WARNING, 1580 "register_send: ip6_mrouter socket queue full\n"); 1581 #endif 1582 ++mrt6stat.mrt6s_upq_sockfull; 1583 return ENOBUFS; 1584 } 1585 return 0; 1586 } 1587 1588 /* 1589 * PIM sparse mode hook 1590 * Receives the pim control messages, and passes them up to the listening 1591 * socket, using rip6_input. 1592 * The only message processed is the REGISTER pim message; the pim header 1593 * is stripped off, and the inner packet is passed to register_mforward. 1594 */ 1595 int 1596 pim6_input(mp, offp, proto) 1597 struct mbuf **mp; 1598 int *offp, proto; 1599 { 1600 struct pim *pim; /* pointer to a pim struct */ 1601 struct ip6_hdr *ip6; 1602 int pimlen; 1603 struct mbuf *m = *mp; 1604 int minlen; 1605 int off = *offp; 1606 1607 ++pim6stat.pim6s_rcv_total; 1608 1609 ip6 = mtod(m, struct ip6_hdr *); 1610 pimlen = m->m_pkthdr.len - *offp; 1611 1612 /* 1613 * Validate lengths 1614 */ 1615 if (pimlen < PIM_MINLEN) { 1616 ++pim6stat.pim6s_rcv_tooshort; 1617 #ifdef MRT6DEBUG 1618 if (mrt6debug & DEBUG_PIM) 1619 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1620 #endif 1621 m_freem(m); 1622 return(IPPROTO_DONE); 1623 } 1624 1625 /* 1626 * if the packet is at least as big as a REGISTER, go ahead 1627 * and grab the PIM REGISTER header size, to avoid another 1628 * possible m_pullup() later. 1629 * 1630 * PIM_MINLEN == pimhdr + u_int32 == 8 1631 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1632 */ 1633 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1634 1635 /* 1636 * Make sure that the IP6 and PIM headers in contiguous memory, and 1637 * possibly the PIM REGISTER header 1638 */ 1639 #ifndef PULLDOWN_TEST 1640 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1641 /* adjust pointer */ 1642 ip6 = mtod(m, struct ip6_hdr *); 1643 1644 /* adjust mbuf to point to the PIM header */ 1645 pim = (struct pim *)((caddr_t)ip6 + off); 1646 #else 1647 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1648 if (pim == NULL) { 1649 pim6stat.pim6s_rcv_tooshort++; 1650 return IPPROTO_DONE; 1651 } 1652 #endif 1653 1654 #define PIM6_CHECKSUM 1655 #ifdef PIM6_CHECKSUM 1656 { 1657 int cksumlen; 1658 1659 /* 1660 * Validate checksum. 1661 * If PIM REGISTER, exclude the data packet 1662 */ 1663 if (pim->pim_type == PIM_REGISTER) 1664 cksumlen = PIM_MINLEN; 1665 else 1666 cksumlen = pimlen; 1667 1668 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1669 ++pim6stat.pim6s_rcv_badsum; 1670 #ifdef MRT6DEBUG 1671 if (mrt6debug & DEBUG_PIM) 1672 log(LOG_DEBUG, 1673 "pim6_input: invalid checksum\n"); 1674 #endif 1675 m_freem(m); 1676 return(IPPROTO_DONE); 1677 } 1678 } 1679 #endif /* PIM_CHECKSUM */ 1680 1681 /* PIM version check */ 1682 if (pim->pim_ver != PIM_VERSION) { 1683 ++pim6stat.pim6s_rcv_badversion; 1684 #ifdef MRT6DEBUG 1685 log(LOG_ERR, 1686 "pim6_input: incorrect version %d, expecting %d\n", 1687 pim->pim_ver, PIM_VERSION); 1688 #endif 1689 m_freem(m); 1690 return(IPPROTO_DONE); 1691 } 1692 1693 if (pim->pim_type == PIM_REGISTER) { 1694 /* 1695 * since this is a REGISTER, we'll make a copy of the register 1696 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1697 * routing daemon. 1698 */ 1699 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1700 1701 struct mbuf *mcp; 1702 struct ip6_hdr *eip6; 1703 u_int32_t *reghdr; 1704 int rc; 1705 1706 ++pim6stat.pim6s_rcv_registers; 1707 1708 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1709 #ifdef MRT6DEBUG 1710 if (mrt6debug & DEBUG_PIM) 1711 log(LOG_DEBUG, 1712 "pim6_input: register mif not set: %d\n", 1713 reg_mif_num); 1714 #endif 1715 m_freem(m); 1716 return(IPPROTO_DONE); 1717 } 1718 1719 reghdr = (u_int32_t *)(pim + 1); 1720 1721 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1722 goto pim6_input_to_daemon; 1723 1724 /* 1725 * Validate length 1726 */ 1727 if (pimlen < PIM6_REG_MINLEN) { 1728 ++pim6stat.pim6s_rcv_tooshort; 1729 ++pim6stat.pim6s_rcv_badregisters; 1730 #ifdef MRT6DEBUG 1731 log(LOG_ERR, 1732 "pim6_input: register packet size too " 1733 "small %d from %s\n", 1734 pimlen, ip6_sprintf(&ip6->ip6_src)); 1735 #endif 1736 m_freem(m); 1737 return(IPPROTO_DONE); 1738 } 1739 1740 eip6 = (struct ip6_hdr *) (reghdr + 1); 1741 #ifdef MRT6DEBUG 1742 if (mrt6debug & DEBUG_PIM) 1743 log(LOG_DEBUG, 1744 "pim6_input[register], eip6: %s -> %s, " 1745 "eip6 plen %d\n", 1746 ip6_sprintf(&eip6->ip6_src), 1747 ip6_sprintf(&eip6->ip6_dst), 1748 ntohs(eip6->ip6_plen)); 1749 #endif 1750 1751 /* verify the version number of the inner packet */ 1752 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1753 ++pim6stat.pim6s_rcv_badregisters; 1754 #ifdef MRT6DEBUG 1755 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1756 "of the inner packet\n", 1757 (eip6->ip6_vfc & IPV6_VERSION)); 1758 #endif 1759 m_freem(m); 1760 return(IPPROTO_NONE); 1761 } 1762 1763 /* verify the inner packet is destined to a mcast group */ 1764 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1765 ++pim6stat.pim6s_rcv_badregisters; 1766 #ifdef MRT6DEBUG 1767 if (mrt6debug & DEBUG_PIM) 1768 log(LOG_DEBUG, 1769 "pim6_input: inner packet of register " 1770 "is not multicast %s\n", 1771 ip6_sprintf(&eip6->ip6_dst)); 1772 #endif 1773 m_freem(m); 1774 return(IPPROTO_DONE); 1775 } 1776 1777 /* 1778 * make a copy of the whole header to pass to the daemon later. 1779 */ 1780 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1781 if (mcp == NULL) { 1782 #ifdef MRT6DEBUG 1783 log(LOG_ERR, 1784 "pim6_input: pim register: " 1785 "could not copy register head\n"); 1786 #endif 1787 m_freem(m); 1788 return(IPPROTO_DONE); 1789 } 1790 1791 /* 1792 * forward the inner ip6 packet; point m_data at the inner ip6. 1793 */ 1794 m_adj(m, off + PIM_MINLEN); 1795 #ifdef MRT6DEBUG 1796 if (mrt6debug & DEBUG_PIM) { 1797 log(LOG_DEBUG, 1798 "pim6_input: forwarding decapsulated register: " 1799 "src %s, dst %s, mif %d\n", 1800 ip6_sprintf(&eip6->ip6_src), 1801 ip6_sprintf(&eip6->ip6_dst), 1802 reg_mif_num); 1803 } 1804 #endif 1805 1806 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1807 dst.sin6_family, NULL); 1808 1809 /* prepare the register head to send to the mrouting daemon */ 1810 m = mcp; 1811 } 1812 1813 /* 1814 * Pass the PIM message up to the daemon; if it is a register message 1815 * pass the 'head' only up to the daemon. This includes the 1816 * encapsulator ip6 header, pim header, register header and the 1817 * encapsulated ip6 header. 1818 */ 1819 pim6_input_to_daemon: 1820 rip6_input(&m, offp, proto); 1821 return(IPPROTO_DONE); 1822 }
Cache object: 2e31159a89d0bad02ed80c7543bd9a37
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