ip6_mroute.c revision 1.11
1 /* $NetBSD: ip6_mroute.c,v 1.11 2000/03/23 07:03:30 thorpej Exp $ */ 2 3 /* 4 * Copyright (C) 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ 33 34 /* 35 * IP multicast forwarding procedures 36 * 37 * Written by David Waitzman, BBN Labs, August 1988. 38 * Modified by Steve Deering, Stanford, February 1989. 39 * Modified by Mark J. Steiglitz, Stanford, May, 1991 40 * Modified by Van Jacobson, LBL, January 1993 41 * Modified by Ajit Thyagarajan, PARC, August 1993 42 * Modified by Bill Fenenr, PARC, April 1994 43 * 44 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 45 */ 46 47 #include "opt_inet.h" 48 49 #ifndef _KERNEL 50 # ifdef KERNEL 51 # define _KERNEL 52 # endif 53 #endif 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/callout.h> 58 #include <sys/mbuf.h> 59 #include <sys/socket.h> 60 #include <sys/socketvar.h> 61 #include <sys/sockio.h> 62 #include <sys/protosw.h> 63 #include <sys/errno.h> 64 #include <sys/time.h> 65 #include <sys/kernel.h> 66 #include <sys/ioctl.h> 67 #include <sys/syslog.h> 68 69 #include <net/if.h> 70 #include <net/route.h> 71 #include <net/raw_cb.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_var.h> 75 76 #include <netinet/ip6.h> 77 #include <netinet6/ip6_var.h> 78 #include <netinet6/ip6_mroute.h> 79 #include <netinet6/pim6.h> 80 #include <netinet6/pim6_var.h> 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 get_pim6 __P((struct mbuf *)); 89 static int socket_send __P((struct socket *, struct mbuf *, 90 struct sockaddr_in6 *)); 91 static int register_send __P((struct ip6_hdr *, struct mif6 *, 92 struct mbuf *)); 93 94 /* 95 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 96 * except for netstat or debugging purposes. 97 */ 98 struct socket *ip6_mrouter = NULL; 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 nexpire[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; 147 148 /* 149 * one-back cache used by ipip_input to locate a tunnel's mif 150 * given a datagram's src ip address. 151 */ 152 static int pim6; 153 154 /* 155 * Hash function for a source, group entry 156 */ 157 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 158 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 159 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 160 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 161 162 /* 163 * Find a route for a given origin IPv6 address and Multicast group address. 164 * Quality of service parameter to be added in the future!!! 165 */ 166 167 #define MF6CFIND(o, g, rt) { \ 168 register struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 169 rt = NULL; \ 170 mrt6stat.mrt6s_mfc_lookups++; \ 171 while (_rt) { \ 172 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 173 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 174 (_rt->mf6c_stall == NULL)) { \ 175 rt = _rt; \ 176 break; \ 177 } \ 178 _rt = _rt->mf6c_next; \ 179 } \ 180 if (rt == NULL) { \ 181 mrt6stat.mrt6s_mfc_misses++; \ 182 } \ 183 } 184 185 /* 186 * Macros to compute elapsed time efficiently 187 * Borrowed from Van Jacobson's scheduling code 188 */ 189 #define TV_DELTA(a, b, delta) { \ 190 register int xxs; \ 191 \ 192 delta = (a).tv_usec - (b).tv_usec; \ 193 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 194 switch (xxs) { \ 195 case 2: \ 196 delta += 1000000; \ 197 /* fall through */ \ 198 case 1: \ 199 delta += 1000000; \ 200 break; \ 201 default: \ 202 delta += (1000000 * xxs); \ 203 } \ 204 } \ 205 } 206 207 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 208 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 209 210 #ifdef UPCALL_TIMING 211 #define UPCALL_MAX 50 212 u_long upcall_data[UPCALL_MAX + 1]; 213 static void collate(); 214 #endif /* UPCALL_TIMING */ 215 216 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 217 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 218 static int ip6_mrouter_init __P((struct socket *, struct mbuf *)); 219 static int add_m6if __P((struct mif6ctl *)); 220 static int del_m6if __P((mifi_t *)); 221 static int add_m6fc __P((struct mf6cctl *)); 222 static int del_m6fc __P((struct mf6cctl *)); 223 224 static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER; 225 226 /* 227 * Handle MRT setsockopt commands to modify the multicast routing tables. 228 */ 229 int 230 ip6_mrouter_set(cmd, so, m) 231 int cmd; 232 struct socket *so; 233 struct mbuf *m; 234 { 235 if (cmd != MRT6_INIT && so != ip6_mrouter) 236 return EACCES; 237 238 switch (cmd) { 239 case MRT6_INIT: return ip6_mrouter_init(so, m); 240 case MRT6_DONE: return ip6_mrouter_done(); 241 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 242 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 243 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 244 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 245 case MRT6_PIM: return set_pim6(mtod(m, int *)); 246 default: return EOPNOTSUPP; 247 } 248 } 249 250 /* 251 * Handle MRT getsockopt commands 252 */ 253 int 254 ip6_mrouter_get(cmd, so, m) 255 int cmd; 256 struct socket *so; 257 struct mbuf **m; 258 { 259 struct mbuf *mb; 260 261 if (so != ip6_mrouter) return EACCES; 262 263 *m = mb = m_get(M_WAIT, MT_SOOPTS); 264 265 switch (cmd) { 266 case MRT6_PIM: return get_pim6(mb); 267 default: 268 m_free(mb); 269 return EOPNOTSUPP; 270 } 271 } 272 273 /* 274 * Handle ioctl commands to obtain information from the cache 275 */ 276 int 277 mrt6_ioctl(cmd, data) 278 int cmd; 279 caddr_t data; 280 { 281 int error = 0; 282 283 switch (cmd) { 284 case SIOCGETSGCNT_IN6: 285 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 286 break; /* for safety */ 287 case SIOCGETMIFCNT_IN6: 288 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 289 break; /* for safety */ 290 default: 291 return (EINVAL); 292 break; 293 } 294 return error; 295 } 296 297 /* 298 * returns the packet, byte, rpf-failure count for the source group provided 299 */ 300 static int 301 get_sg_cnt(req) 302 register struct sioc_sg_req6 *req; 303 { 304 register struct mf6c *rt; 305 int s; 306 307 s = splsoftnet(); 308 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 309 splx(s); 310 if (rt != NULL) { 311 req->pktcnt = rt->mf6c_pkt_cnt; 312 req->bytecnt = rt->mf6c_byte_cnt; 313 req->wrong_if = rt->mf6c_wrong_if; 314 } else 315 return(ESRCH); 316 #if 0 317 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 318 #endif 319 320 return 0; 321 } 322 323 /* 324 * returns the input and output packet and byte counts on the mif provided 325 */ 326 static int 327 get_mif6_cnt(req) 328 register struct sioc_mif_req6 *req; 329 { 330 register mifi_t mifi = req->mifi; 331 332 if (mifi >= nummifs) 333 return EINVAL; 334 335 req->icount = mif6table[mifi].m6_pkt_in; 336 req->ocount = mif6table[mifi].m6_pkt_out; 337 req->ibytes = mif6table[mifi].m6_bytes_in; 338 req->obytes = mif6table[mifi].m6_bytes_out; 339 340 return 0; 341 } 342 343 /* 344 * Get PIM processiong global 345 */ 346 static int 347 get_pim6(m) 348 struct mbuf *m; 349 { 350 int *i; 351 352 i = mtod(m, int *); 353 354 *i = pim6; 355 356 return 0; 357 } 358 359 static int 360 set_pim6(i) 361 int *i; 362 { 363 if ((*i != 1) && (*i != 0)) 364 return EINVAL; 365 366 pim6 = *i; 367 368 return 0; 369 } 370 371 /* 372 * Enable multicast routing 373 */ 374 static int 375 ip6_mrouter_init(so, m) 376 struct socket *so; 377 struct mbuf *m; 378 { 379 int *v; 380 381 #ifdef MRT6DEBUG 382 if (mrt6debug) 383 log(LOG_DEBUG, 384 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 385 so->so_type, so->so_proto->pr_protocol); 386 #endif 387 388 if (so->so_type != SOCK_RAW || 389 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 390 return EOPNOTSUPP; 391 392 if (!m || (m->m_len != sizeof(int *))) 393 return ENOPROTOOPT; 394 395 v = mtod(m, int *); 396 if (*v != 1) 397 return ENOPROTOOPT; 398 399 if (ip6_mrouter != NULL) return EADDRINUSE; 400 401 ip6_mrouter = so; 402 403 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 404 bzero((caddr_t)nexpire, sizeof(nexpire)); 405 406 pim6 = 0;/* used for stubbing out/in pim stuff */ 407 408 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 409 expire_upcalls, NULL); 410 411 #ifdef MRT6DEBUG 412 if (mrt6debug) 413 log(LOG_DEBUG, "ip6_mrouter_init\n"); 414 #endif 415 416 return 0; 417 } 418 419 /* 420 * Disable multicast routing 421 */ 422 int 423 ip6_mrouter_done() 424 { 425 mifi_t mifi; 426 int i; 427 struct ifnet *ifp; 428 struct in6_ifreq ifr; 429 struct mf6c *rt; 430 struct rtdetq *rte; 431 int s; 432 433 s = splsoftnet(); 434 435 /* 436 * For each phyint in use, disable promiscuous reception of all IPv6 437 * multicasts. 438 */ 439 #ifdef INET 440 #ifdef MROUTING 441 /* 442 * If there is still IPv4 multicast routing daemon, 443 * we remain interfaces to receive all muliticasted packets. 444 * XXX: there may be an interface in which the IPv4 multicast 445 * daemon is not interested... 446 */ 447 if (!ip_mrouter) 448 #endif 449 #endif 450 { 451 for (mifi = 0; mifi < nummifs; mifi++) { 452 if (mif6table[mifi].m6_ifp && 453 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 454 ifr.ifr_addr.sin6_family = AF_INET6; 455 ifr.ifr_addr.sin6_addr= in6addr_any; 456 ifp = mif6table[mifi].m6_ifp; 457 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 458 (caddr_t)&ifr); 459 } 460 } 461 } 462 #ifdef notyet 463 bzero((caddr_t)qtable, sizeof(qtable)); 464 bzero((caddr_t)tbftable, sizeof(tbftable)); 465 #endif 466 bzero((caddr_t)mif6table, sizeof(mif6table)); 467 nummifs = 0; 468 469 pim6 = 0; /* used to stub out/in pim specific code */ 470 471 callout_stop(&expire_upcalls_ch); 472 473 /* 474 * Free all multicast forwarding cache entries. 475 */ 476 for (i = 0; i < MF6CTBLSIZ; i++) { 477 rt = mf6ctable[i]; 478 while (rt) { 479 struct mf6c *frt; 480 481 for (rte = rt->mf6c_stall; rte != NULL; ) { 482 struct rtdetq *n = rte->next; 483 484 m_free(rte->m); 485 free(rte, M_MRTABLE); 486 rte = n; 487 } 488 frt = rt; 489 rt = rt->mf6c_next; 490 free(frt, M_MRTABLE); 491 } 492 } 493 494 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 495 496 /* 497 * Reset de-encapsulation cache 498 */ 499 reg_mif_num = -1; 500 501 ip6_mrouter = NULL; 502 503 splx(s); 504 505 #ifdef MRT6DEBUG 506 if (mrt6debug) 507 log(LOG_DEBUG, "ip6_mrouter_done\n"); 508 #endif 509 510 return 0; 511 } 512 513 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 514 515 /* 516 * Add a mif to the mif table 517 */ 518 static int 519 add_m6if(mifcp) 520 register struct mif6ctl *mifcp; 521 { 522 register struct mif6 *mifp; 523 struct ifnet *ifp; 524 struct in6_ifreq ifr; 525 int error, s; 526 #ifdef notyet 527 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 528 #endif 529 530 if (mifcp->mif6c_mifi >= MAXMIFS) 531 return EINVAL; 532 mifp = mif6table + mifcp->mif6c_mifi; 533 if (mifp->m6_ifp) 534 return EADDRINUSE; /* XXX: is it appropriate? */ 535 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 536 return ENXIO; 537 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 538 539 if (mifcp->mif6c_flags & MIFF_REGISTER) { 540 if (reg_mif_num == (mifi_t)-1) { 541 strcpy(multicast_register_if.if_xname, 542 "register_mif"); /* XXX */ 543 multicast_register_if.if_flags |= IFF_LOOPBACK; 544 multicast_register_if.if_index = mifcp->mif6c_mifi; 545 reg_mif_num = mifcp->mif6c_mifi; 546 } 547 548 ifp = &multicast_register_if; 549 550 } /* if REGISTER */ 551 else { 552 /* Make sure the interface supports multicast */ 553 if ((ifp->if_flags & IFF_MULTICAST) == 0) 554 return EOPNOTSUPP; 555 556 s = splsoftnet(); 557 /* 558 * Enable promiscuous reception of all IPv6 multicasts 559 * from the interface. 560 */ 561 ifr.ifr_addr.sin6_family = AF_INET6; 562 ifr.ifr_addr.sin6_addr = in6addr_any; 563 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 564 splx(s); 565 if (error) 566 return error; 567 } 568 569 s = splsoftnet(); 570 mifp->m6_flags = mifcp->mif6c_flags; 571 mifp->m6_ifp = ifp; 572 #ifdef notyet 573 /* scaling up here allows division by 1024 in critical code */ 574 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 575 #endif 576 /* initialize per mif pkt counters */ 577 mifp->m6_pkt_in = 0; 578 mifp->m6_pkt_out = 0; 579 mifp->m6_bytes_in = 0; 580 mifp->m6_bytes_out = 0; 581 splx(s); 582 583 /* Adjust nummifs up if the mifi is higher than nummifs */ 584 if (nummifs <= mifcp->mif6c_mifi) 585 nummifs = mifcp->mif6c_mifi + 1; 586 587 #ifdef MRT6DEBUG 588 if (mrt6debug) 589 log(LOG_DEBUG, 590 "add_mif #%d, phyint %s%d\n", 591 mifcp->mif6c_mifi, 592 ifp->if_name, ifp->if_unit); 593 #endif 594 595 return 0; 596 } 597 598 /* 599 * Delete a mif from the mif table 600 */ 601 static int 602 del_m6if(mifip) 603 mifi_t *mifip; 604 { 605 register struct mif6 *mifp = mif6table + *mifip; 606 register mifi_t mifi; 607 struct ifnet *ifp; 608 struct in6_ifreq ifr; 609 int s; 610 611 if (*mifip >= nummifs) 612 return EINVAL; 613 if (mifp->m6_ifp == NULL) 614 return EINVAL; 615 616 s = splsoftnet(); 617 618 if (!(mifp->m6_flags & MIFF_REGISTER)) { 619 /* 620 * XXX: what if there is yet IPv4 multicast daemon 621 * using the interface? 622 */ 623 ifp = mifp->m6_ifp; 624 625 ifr.ifr_addr.sin6_family = AF_INET6; 626 ifr.ifr_addr.sin6_addr = in6addr_any; 627 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 628 } 629 630 #ifdef notyet 631 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 632 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 633 #endif 634 bzero((caddr_t)mifp, sizeof (*mifp)); 635 636 /* Adjust nummifs down */ 637 for (mifi = nummifs; mifi > 0; mifi--) 638 if (mif6table[mifi - 1].m6_ifp) 639 break; 640 nummifs = mifi; 641 642 splx(s); 643 644 #ifdef MRT6DEBUG 645 if (mrt6debug) 646 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 647 #endif 648 649 return 0; 650 } 651 652 /* 653 * Add an mfc entry 654 */ 655 static int 656 add_m6fc(mfccp) 657 struct mf6cctl *mfccp; 658 { 659 struct mf6c *rt; 660 u_long hash; 661 struct rtdetq *rte; 662 register u_short nstl; 663 int s; 664 665 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 666 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 667 668 /* If an entry already exists, just update the fields */ 669 if (rt) { 670 #ifdef MRT6DEBUG 671 if (mrt6debug & DEBUG_MFC) 672 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 673 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 674 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 675 mfccp->mf6cc_parent); 676 #endif 677 678 s = splsoftnet(); 679 rt->mf6c_parent = mfccp->mf6cc_parent; 680 rt->mf6c_ifset = mfccp->mf6cc_ifset; 681 splx(s); 682 return 0; 683 } 684 685 /* 686 * Find the entry for which the upcall was made and update 687 */ 688 s = splsoftnet(); 689 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 690 mfccp->mf6cc_mcastgrp.sin6_addr); 691 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 692 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 693 &mfccp->mf6cc_origin.sin6_addr) && 694 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 695 &mfccp->mf6cc_mcastgrp.sin6_addr) && 696 (rt->mf6c_stall != NULL)) { 697 698 if (nstl++) 699 log(LOG_ERR, 700 "add_m6fc: %s o %s g %s p %x dbx %p\n", 701 "multiple kernel entries", 702 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 703 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 704 mfccp->mf6cc_parent, rt->mf6c_stall); 705 706 #ifdef MRT6DEBUG 707 if (mrt6debug & DEBUG_MFC) 708 log(LOG_DEBUG, 709 "add_m6fc o %s g %s p %x dbg %x\n", 710 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 711 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 712 mfccp->mf6cc_parent, rt->mf6c_stall); 713 #endif 714 715 rt->mf6c_origin = mfccp->mf6cc_origin; 716 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 717 rt->mf6c_parent = mfccp->mf6cc_parent; 718 rt->mf6c_ifset = mfccp->mf6cc_ifset; 719 /* initialize pkt counters per src-grp */ 720 rt->mf6c_pkt_cnt = 0; 721 rt->mf6c_byte_cnt = 0; 722 rt->mf6c_wrong_if = 0; 723 724 rt->mf6c_expire = 0; /* Don't clean this guy up */ 725 nexpire[hash]--; 726 727 /* free packets Qed at the end of this entry */ 728 for (rte = rt->mf6c_stall; rte != NULL; ) { 729 struct rtdetq *n = rte->next; 730 ip6_mdq(rte->m, rte->ifp, rt); 731 m_freem(rte->m); 732 #ifdef UPCALL_TIMING 733 collate(&(rte->t)); 734 #endif /* UPCALL_TIMING */ 735 free(rte, M_MRTABLE); 736 rte = n; 737 } 738 rt->mf6c_stall = NULL; 739 } 740 } 741 742 /* 743 * It is possible that an entry is being inserted without an upcall 744 */ 745 if (nstl == 0) { 746 #ifdef MRT6DEBUG 747 if (mrt6debug & DEBUG_MFC) 748 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 749 hash, 750 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 751 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 752 mfccp->mf6cc_parent); 753 #endif 754 755 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 756 757 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 758 &mfccp->mf6cc_origin.sin6_addr)&& 759 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 760 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 761 762 rt->mf6c_origin = mfccp->mf6cc_origin; 763 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 764 rt->mf6c_parent = mfccp->mf6cc_parent; 765 /* initialize pkt counters per src-grp */ 766 rt->mf6c_pkt_cnt = 0; 767 rt->mf6c_byte_cnt = 0; 768 rt->mf6c_wrong_if = 0; 769 770 if (rt->mf6c_expire) 771 nexpire[hash]--; 772 rt->mf6c_expire = 0; 773 } 774 } 775 if (rt == NULL) { 776 /* no upcall, so make a new entry */ 777 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 778 M_NOWAIT); 779 if (rt == NULL) { 780 splx(s); 781 return ENOBUFS; 782 } 783 784 /* insert new entry at head of hash chain */ 785 rt->mf6c_origin = mfccp->mf6cc_origin; 786 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 787 rt->mf6c_parent = mfccp->mf6cc_parent; 788 /* initialize pkt counters per src-grp */ 789 rt->mf6c_pkt_cnt = 0; 790 rt->mf6c_byte_cnt = 0; 791 rt->mf6c_wrong_if = 0; 792 rt->mf6c_expire = 0; 793 rt->mf6c_stall = NULL; 794 795 /* link into table */ 796 rt->mf6c_next = mf6ctable[hash]; 797 mf6ctable[hash] = rt; 798 } 799 } 800 splx(s); 801 return 0; 802 } 803 804 #ifdef UPCALL_TIMING 805 /* 806 * collect delay statistics on the upcalls 807 */ 808 static void 809 collate(t) 810 register struct timeval *t; 811 { 812 register u_long d; 813 register struct timeval tp; 814 register u_long delta; 815 816 GET_TIME(tp); 817 818 if (TV_LT(*t, tp)) 819 { 820 TV_DELTA(tp, *t, delta); 821 822 d = delta >> 10; 823 if (d > UPCALL_MAX) 824 d = UPCALL_MAX; 825 826 ++upcall_data[d]; 827 } 828 } 829 #endif /* UPCALL_TIMING */ 830 831 /* 832 * Delete an mfc entry 833 */ 834 static int 835 del_m6fc(mfccp) 836 struct mf6cctl *mfccp; 837 { 838 struct sockaddr_in6 origin; 839 struct sockaddr_in6 mcastgrp; 840 struct mf6c *rt; 841 struct mf6c **nptr; 842 u_long hash; 843 int s; 844 845 origin = mfccp->mf6cc_origin; 846 mcastgrp = mfccp->mf6cc_mcastgrp; 847 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 848 849 #ifdef MRT6DEBUG 850 if (mrt6debug & DEBUG_MFC) 851 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 852 ip6_sprintf(&origin.sin6_addr), 853 ip6_sprintf(&mcastgrp.sin6_addr)); 854 #endif 855 856 s = splsoftnet(); 857 858 nptr = &mf6ctable[hash]; 859 while ((rt = *nptr) != NULL) { 860 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 861 &rt->mf6c_origin.sin6_addr) && 862 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 863 &rt->mf6c_mcastgrp.sin6_addr) && 864 rt->mf6c_stall == NULL) 865 break; 866 867 nptr = &rt->mf6c_next; 868 } 869 if (rt == NULL) { 870 splx(s); 871 return EADDRNOTAVAIL; 872 } 873 874 *nptr = rt->mf6c_next; 875 free(rt, M_MRTABLE); 876 877 splx(s); 878 879 return 0; 880 } 881 882 static int 883 socket_send(s, mm, src) 884 struct socket *s; 885 struct mbuf *mm; 886 struct sockaddr_in6 *src; 887 { 888 if (s) { 889 if (sbappendaddr(&s->so_rcv, 890 (struct sockaddr *)src, 891 mm, (struct mbuf *)0) != 0) { 892 sorwakeup(s); 893 return 0; 894 } 895 } 896 m_freem(mm); 897 return -1; 898 } 899 900 /* 901 * IPv6 multicast forwarding function. This function assumes that the packet 902 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 903 * pointed to by "ifp", and the packet is to be relayed to other networks 904 * that have members of the packet's destination IPv6 multicast group. 905 * 906 * The packet is returned unscathed to the caller, unless it is 907 * erroneous, in which case a non-zero return value tells the caller to 908 * discard it. 909 */ 910 911 int 912 ip6_mforward(ip6, ifp, m) 913 register struct ip6_hdr *ip6; 914 struct ifnet *ifp; 915 struct mbuf *m; 916 { 917 register struct mf6c *rt; 918 register struct mif6 *mifp; 919 register struct mbuf *mm; 920 int s; 921 mifi_t mifi; 922 923 #ifdef MRT6DEBUG 924 if (mrt6debug & DEBUG_FORWARD) 925 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 926 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 927 ifp->if_index); 928 #endif 929 930 /* 931 * Don't forward a packet with Hop limit of zero or one, 932 * or a packet destined to a local-only group. 933 */ 934 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 935 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 936 return 0; 937 ip6->ip6_hlim--; 938 939 /* 940 * Determine forwarding mifs from the forwarding cache table 941 */ 942 s = splsoftnet(); 943 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 944 945 /* Entry exists, so forward if necessary */ 946 if (rt) { 947 splx(s); 948 return (ip6_mdq(m, ifp, rt)); 949 } else { 950 /* 951 * If we don't have a route for packet's origin, 952 * Make a copy of the packet & 953 * send message to routing daemon 954 */ 955 956 register struct mbuf *mb0; 957 register struct rtdetq *rte; 958 register u_long hash; 959 /* register int i, npkts;*/ 960 #ifdef UPCALL_TIMING 961 struct timeval tp; 962 963 GET_TIME(tp); 964 #endif /* UPCALL_TIMING */ 965 966 mrt6stat.mrt6s_no_route++; 967 #ifdef MRT6DEBUG 968 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 969 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 970 ip6_sprintf(&ip6->ip6_src), 971 ip6_sprintf(&ip6->ip6_dst)); 972 #endif 973 974 /* 975 * Allocate mbufs early so that we don't do extra work if we 976 * are just going to fail anyway. 977 */ 978 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 979 M_NOWAIT); 980 if (rte == NULL) { 981 splx(s); 982 return ENOBUFS; 983 } 984 mb0 = m_copy(m, 0, M_COPYALL); 985 /* 986 * Pullup packet header if needed before storing it, 987 * as other references may modify it in the meantime. 988 */ 989 if (mb0 && 990 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 991 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 992 if (mb0 == NULL) { 993 free(rte, M_MRTABLE); 994 splx(s); 995 return ENOBUFS; 996 } 997 998 /* is there an upcall waiting for this packet? */ 999 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1000 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1001 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1002 &rt->mf6c_origin.sin6_addr) && 1003 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1004 &rt->mf6c_mcastgrp.sin6_addr) && 1005 (rt->mf6c_stall != NULL)) 1006 break; 1007 } 1008 1009 if (rt == NULL) { 1010 struct mrt6msg *im; 1011 1012 /* no upcall, so make a new entry */ 1013 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1014 M_NOWAIT); 1015 if (rt == NULL) { 1016 free(rte, M_MRTABLE); 1017 m_freem(mb0); 1018 splx(s); 1019 return ENOBUFS; 1020 } 1021 /* 1022 * Make a copy of the header to send to the user 1023 * level process 1024 */ 1025 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1026 1027 if (mm == NULL) { 1028 free(rte, M_MRTABLE); 1029 m_freem(mb0); 1030 free(rt, M_MRTABLE); 1031 splx(s); 1032 return ENOBUFS; 1033 } 1034 1035 /* 1036 * Send message to routing daemon 1037 */ 1038 sin6.sin6_addr = ip6->ip6_src; 1039 1040 im = mtod(mm, struct mrt6msg *); 1041 im->im6_msgtype = MRT6MSG_NOCACHE; 1042 im->im6_mbz = 0; 1043 1044 #ifdef MRT6DEBUG 1045 if (mrt6debug & DEBUG_FORWARD) 1046 log(LOG_DEBUG, 1047 "getting the iif info in the kernel\n"); 1048 #endif 1049 1050 for (mifp = mif6table, mifi = 0; 1051 mifi < nummifs && mifp->m6_ifp != ifp; 1052 mifp++, mifi++) 1053 ; 1054 1055 im->im6_mif = mifi; 1056 1057 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1058 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1059 "socket queue full\n"); 1060 mrt6stat.mrt6s_upq_sockfull++; 1061 free(rte, M_MRTABLE); 1062 m_freem(mb0); 1063 free(rt, M_MRTABLE); 1064 splx(s); 1065 return ENOBUFS; 1066 } 1067 1068 mrt6stat.mrt6s_upcalls++; 1069 1070 /* insert new entry at head of hash chain */ 1071 bzero(rt, sizeof(*rt)); 1072 rt->mf6c_origin.sin6_family = AF_INET6; 1073 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1074 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1075 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1076 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1077 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1078 rt->mf6c_expire = UPCALL_EXPIRE; 1079 nexpire[hash]++; 1080 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1081 1082 /* link into table */ 1083 rt->mf6c_next = mf6ctable[hash]; 1084 mf6ctable[hash] = rt; 1085 /* Add this entry to the end of the queue */ 1086 rt->mf6c_stall = rte; 1087 } else { 1088 /* determine if q has overflowed */ 1089 struct rtdetq **p; 1090 register int npkts = 0; 1091 1092 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1093 if (++npkts > MAX_UPQ6) { 1094 mrt6stat.mrt6s_upq_ovflw++; 1095 free(rte, M_MRTABLE); 1096 m_freem(mb0); 1097 splx(s); 1098 return 0; 1099 } 1100 1101 /* Add this entry to the end of the queue */ 1102 *p = rte; 1103 } 1104 1105 rte->next = NULL; 1106 rte->m = mb0; 1107 rte->ifp = ifp; 1108 #ifdef UPCALL_TIMING 1109 rte->t = tp; 1110 #endif /* UPCALL_TIMING */ 1111 1112 splx(s); 1113 1114 return 0; 1115 } 1116 } 1117 1118 /* 1119 * Clean up cache entries if upcalls are not serviced 1120 * Call from the Slow Timeout mechanism, every half second. 1121 */ 1122 static void 1123 expire_upcalls(unused) 1124 void *unused; 1125 { 1126 struct rtdetq *rte; 1127 struct mf6c *mfc, **nptr; 1128 int i; 1129 int s; 1130 1131 s = splsoftnet(); 1132 for (i = 0; i < MF6CTBLSIZ; i++) { 1133 if (nexpire[i] == 0) 1134 continue; 1135 nptr = &mf6ctable[i]; 1136 while ((mfc = *nptr) != NULL) { 1137 rte = mfc->mf6c_stall; 1138 /* 1139 * Skip real cache entries 1140 * Make sure it wasn't marked to not expire (shouldn't happen) 1141 * If it expires now 1142 */ 1143 if (rte != NULL && 1144 mfc->mf6c_expire != 0 && 1145 --mfc->mf6c_expire == 0) { 1146 #ifdef MRT6DEBUG 1147 if (mrt6debug & DEBUG_EXPIRE) 1148 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1149 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1150 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1151 #endif 1152 /* 1153 * drop all the packets 1154 * free the mbuf with the pkt, if, timing info 1155 */ 1156 do { 1157 struct rtdetq *n = rte->next; 1158 m_freem(rte->m); 1159 free(rte, M_MRTABLE); 1160 rte = n; 1161 } while (rte != NULL); 1162 mrt6stat.mrt6s_cache_cleanups++; 1163 nexpire[i]--; 1164 1165 *nptr = mfc->mf6c_next; 1166 free(mfc, M_MRTABLE); 1167 } else { 1168 nptr = &mfc->mf6c_next; 1169 } 1170 } 1171 } 1172 splx(s); 1173 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1174 expire_upcalls, NULL); 1175 } 1176 1177 /* 1178 * Packet forwarding routine once entry in the cache is made 1179 */ 1180 static int 1181 ip6_mdq(m, ifp, rt) 1182 register struct mbuf *m; 1183 register struct ifnet *ifp; 1184 register struct mf6c *rt; 1185 { 1186 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1187 register mifi_t mifi, iif; 1188 register struct mif6 *mifp; 1189 register int plen = m->m_pkthdr.len; 1190 1191 /* 1192 * Macro to send packet on mif. Since RSVP packets don't get counted on 1193 * input, they shouldn't get counted on output, so statistics keeping is 1194 * seperate. 1195 */ 1196 1197 #define MC6_SEND(ip6,mifp,m) { \ 1198 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1199 register_send((ip6), (mifp), (m)); \ 1200 else \ 1201 phyint_send((ip6), (mifp), (m)); \ 1202 } 1203 1204 /* 1205 * Don't forward if it didn't arrive from the parent mif 1206 * for its origin. 1207 */ 1208 mifi = rt->mf6c_parent; 1209 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1210 /* came in the wrong interface */ 1211 #ifdef MRT6DEBUG 1212 if (mrt6debug & DEBUG_FORWARD) 1213 log(LOG_DEBUG, 1214 "wrong if: ifid %d mifi %d mififid %x\n", 1215 ifp->if_index, mifi, 1216 mif6table[mifi].m6_ifp->if_index); 1217 #endif 1218 mrt6stat.mrt6s_wrong_if++; 1219 rt->mf6c_wrong_if++; 1220 /* 1221 * If we are doing PIM processing, and we are forwarding 1222 * packets on this interface, send a message to the 1223 * routing daemon. 1224 */ 1225 if(mifi < nummifs) /* have to make sure this is a valid mif */ 1226 if(mif6table[mifi].m6_ifp) 1227 1228 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1229 /* 1230 * Check the M_LOOP flag to avoid an 1231 * unnecessary PIM assert. 1232 * XXX: M_LOOP is an ad-hoc hack... 1233 */ 1234 static struct sockaddr_in6 sin6 = 1235 { sizeof(sin6), AF_INET6 }; 1236 1237 register struct mbuf *mm; 1238 struct mrt6msg *im; 1239 1240 mm = m_copy(m, 0, 1241 sizeof(struct ip6_hdr)); 1242 if (mm && 1243 (M_HASCL(mm) || 1244 mm->m_len < sizeof(struct ip6_hdr))) 1245 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1246 if (mm == NULL) 1247 return ENOBUFS; 1248 1249 im = mtod(mm, struct mrt6msg *); 1250 im->im6_msgtype = MRT6MSG_WRONGMIF; 1251 im->im6_mbz = 0; 1252 1253 for (mifp = mif6table, iif = 0; 1254 iif < nummifs && mifp && 1255 mifp->m6_ifp != ifp; 1256 mifp++, iif++); 1257 1258 im->im6_mif = iif; 1259 1260 sin6.sin6_addr = im->im6_src; 1261 1262 mrt6stat.mrt6s_upcalls++; 1263 1264 if (socket_send(ip6_mrouter, mm, 1265 &sin6) < 0) { 1266 #ifdef MRT6DEBUG 1267 if (mrt6debug) 1268 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1269 #endif 1270 ++mrt6stat.mrt6s_upq_sockfull; 1271 return ENOBUFS; 1272 } /* if socket Q full */ 1273 } /* if PIM */ 1274 return 0; 1275 } /* if wrong iif */ 1276 1277 /* If I sourced this packet, it counts as output, else it was input. */ 1278 if (m->m_pkthdr.rcvif == NULL) { 1279 /* XXX: is rcvif really NULL when output?? */ 1280 mif6table[mifi].m6_pkt_out++; 1281 mif6table[mifi].m6_bytes_out += plen; 1282 } else { 1283 mif6table[mifi].m6_pkt_in++; 1284 mif6table[mifi].m6_bytes_in += plen; 1285 } 1286 rt->mf6c_pkt_cnt++; 1287 rt->mf6c_byte_cnt += plen; 1288 1289 /* 1290 * For each mif, forward a copy of the packet if there are group 1291 * members downstream on the interface. 1292 */ 1293 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1294 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1295 mifp->m6_pkt_out++; 1296 mifp->m6_bytes_out += plen; 1297 MC6_SEND(ip6, mifp, m); 1298 } 1299 return 0; 1300 } 1301 1302 static void 1303 phyint_send(ip6, mifp, m) 1304 struct ip6_hdr *ip6; 1305 struct mif6 *mifp; 1306 struct mbuf *m; 1307 { 1308 register struct mbuf *mb_copy; 1309 struct ifnet *ifp = mifp->m6_ifp; 1310 int error = 0; 1311 int s = splsoftnet(); 1312 static struct route_in6 ro6; 1313 struct in6_multi *in6m; 1314 1315 /* 1316 * Make a new reference to the packet; make sure that 1317 * the IPv6 header is actually copied, not just referenced, 1318 * so that ip6_output() only scribbles on the copy. 1319 */ 1320 mb_copy = m_copy(m, 0, M_COPYALL); 1321 if (mb_copy && 1322 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1323 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1324 if (mb_copy == NULL) 1325 return; 1326 /* set MCAST flag to the outgoing packet */ 1327 mb_copy->m_flags |= M_MCAST; 1328 1329 /* 1330 * If we sourced the packet, call ip6_output since we may devide 1331 * the packet into fragments when the packet is too big for the 1332 * outgoing interface. 1333 * Otherwise, we can simply send the packet to the interface 1334 * sending queue. 1335 */ 1336 if (m->m_pkthdr.rcvif == NULL) { 1337 struct ip6_moptions im6o; 1338 1339 im6o.im6o_multicast_ifp = ifp; 1340 /* XXX: ip6_output will override ip6->ip6_hlim */ 1341 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1342 im6o.im6o_multicast_loop = 1; 1343 error = ip6_output(mb_copy, NULL, &ro6, 1344 IPV6_FORWARDING, &im6o, NULL); 1345 1346 #ifdef MRT6DEBUG 1347 if (mrt6debug & DEBUG_XMIT) 1348 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1349 mifp - mif6table, error); 1350 #endif 1351 splx(s); 1352 return; 1353 } 1354 1355 /* 1356 * If we belong to the destination multicast group 1357 * on the outgoing interface, loop back a copy. 1358 */ 1359 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1360 if (in6m != NULL) { 1361 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1362 ro6.ro_dst.sin6_family = AF_INET6; 1363 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1364 ip6_mloopback(ifp, m, &ro6.ro_dst); 1365 } 1366 /* 1367 * Put the packet into the sending queue of the outgoing interface 1368 * if it would fit in the MTU of the interface. 1369 */ 1370 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1371 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1372 ro6.ro_dst.sin6_family = AF_INET6; 1373 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1374 /* 1375 * We just call if_output instead of nd6_output here, since 1376 * we need no ND for a multicast forwarded packet...right? 1377 */ 1378 error = (*ifp->if_output)(ifp, mb_copy, 1379 (struct sockaddr *)&ro6.ro_dst, 1380 NULL); 1381 #ifdef MRT6DEBUG 1382 if (mrt6debug & DEBUG_XMIT) 1383 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1384 mifp - mif6table, error); 1385 #endif 1386 } 1387 else { 1388 #ifdef MULTICAST_PMTUD 1389 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1390 return; 1391 #else 1392 #ifdef MRT6DEBUG 1393 if (mrt6debug & DEBUG_DEBUG_XMIT) 1394 log(LOG_DEBUG, 1395 "phyint_send: packet too big on %s o %s g %s" 1396 " size %d(discarded)\n", 1397 ifp->if_xname, 1398 ip6_sprintf(&ip6->ip6_src), 1399 ip6_sprintf(&ip6->ip6_dst), 1400 mb_copy->m_pkthdr.len); 1401 #endif /* MRT6DEBUG */ 1402 m_freem(mb_copy); /* simply discard the packet */ 1403 return; 1404 #endif 1405 } 1406 } 1407 1408 static int 1409 register_send(ip6, mif, m) 1410 register struct ip6_hdr *ip6; 1411 struct mif6 *mif; 1412 register struct mbuf *m; 1413 { 1414 register struct mbuf *mm; 1415 register int i, len = m->m_pkthdr.len; 1416 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1417 struct mrt6msg *im6; 1418 1419 #ifdef MRT6DEBUG 1420 if (mrt6debug) 1421 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1422 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1423 #endif 1424 ++pim6stat.pim6s_snd_registers; 1425 1426 /* Make a copy of the packet to send to the user level process */ 1427 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1428 if (mm == NULL) 1429 return ENOBUFS; 1430 mm->m_data += max_linkhdr; 1431 mm->m_len = sizeof(struct ip6_hdr); 1432 1433 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1434 m_freem(mm); 1435 return ENOBUFS; 1436 } 1437 i = MHLEN - M_LEADINGSPACE(mm); 1438 if (i > len) 1439 i = len; 1440 mm = m_pullup(mm, i); 1441 if (mm == NULL){ 1442 m_freem(mm); 1443 return ENOBUFS; 1444 } 1445 /* TODO: check it! */ 1446 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1447 1448 /* 1449 * Send message to routing daemon 1450 */ 1451 sin6.sin6_addr = ip6->ip6_src; 1452 1453 im6 = mtod(mm, struct mrt6msg *); 1454 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1455 im6->im6_mbz = 0; 1456 1457 im6->im6_mif = mif - mif6table; 1458 1459 /* iif info is not given for reg. encap.n */ 1460 mrt6stat.mrt6s_upcalls++; 1461 1462 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1463 #ifdef MRT6DEBUG 1464 if (mrt6debug) 1465 log(LOG_WARNING, 1466 "register_send: ip_mrouter socket queue full\n"); 1467 #endif 1468 ++mrt6stat.mrt6s_upq_sockfull; 1469 return ENOBUFS; 1470 } 1471 return 0; 1472 } 1473 1474 /* 1475 * PIM sparse mode hook 1476 * Receives the pim control messages, and passes them up to the listening 1477 * socket, using rip6_input. 1478 * The only message processed is the REGISTER pim message; the pim header 1479 * is stripped off, and the inner packet is passed to register_mforward. 1480 */ 1481 int 1482 pim6_input(mp, offp, proto) 1483 struct mbuf **mp; 1484 int *offp, proto; 1485 { 1486 register struct pim *pim; /* pointer to a pim struct */ 1487 register struct ip6_hdr *ip6; 1488 register int pimlen; 1489 struct mbuf *m = *mp; 1490 int minlen; 1491 int off = *offp; 1492 1493 ++pim6stat.pim6s_rcv_total; 1494 1495 ip6 = mtod(m, struct ip6_hdr *); 1496 pimlen = m->m_pkthdr.len - *offp; 1497 1498 /* 1499 * Validate lengths 1500 */ 1501 if (pimlen < PIM_MINLEN) { 1502 ++pim6stat.pim6s_rcv_tooshort; 1503 #ifdef MRT6DEBUG 1504 if (mrt6debug & DEBUG_PIM) 1505 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1506 #endif 1507 m_freem(m); 1508 return(IPPROTO_DONE); 1509 } 1510 1511 /* 1512 * if the packet is at least as big as a REGISTER, go ahead 1513 * and grab the PIM REGISTER header size, to avoid another 1514 * possible m_pullup() later. 1515 * 1516 * PIM_MINLEN == pimhdr + u_int32 == 8 1517 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1518 */ 1519 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1520 1521 /* 1522 * Make sure that the IP6 and PIM headers in contiguous memory, and 1523 * possibly the PIM REGISTER header 1524 */ 1525 #ifndef PULLDOWN_TEST 1526 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1527 /* adjust pointer */ 1528 ip6 = mtod(m, struct ip6_hdr *); 1529 1530 /* adjust mbuf to point to the PIM header */ 1531 pim = (struct pim *)((caddr_t)ip6 + off); 1532 #else 1533 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1534 if (pim == NULL) { 1535 pim6stat.pim6s_rcv_tooshort++; 1536 return IPPROTO_DONE; 1537 } 1538 #endif 1539 1540 #define PIM6_CHECKSUM 1541 #ifdef PIM6_CHECKSUM 1542 { 1543 int cksumlen; 1544 1545 /* 1546 * Validate checksum. 1547 * If PIM REGISTER, exclude the data packet 1548 */ 1549 if (pim->pim_type == PIM_REGISTER) 1550 cksumlen = PIM_MINLEN; 1551 else 1552 cksumlen = pimlen; 1553 1554 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1555 ++pim6stat.pim6s_rcv_badsum; 1556 #ifdef MRT6DEBUG 1557 if (mrt6debug & DEBUG_PIM) 1558 log(LOG_DEBUG, 1559 "pim6_input: invalid checksum\n"); 1560 #endif 1561 m_freem(m); 1562 return(IPPROTO_DONE); 1563 } 1564 } 1565 #endif /* PIM_CHECKSUM */ 1566 1567 /* PIM version check */ 1568 if (pim->pim_ver != PIM_VERSION) { 1569 ++pim6stat.pim6s_rcv_badversion; 1570 #ifdef MRT6DEBUG 1571 log(LOG_ERR, 1572 "pim6_input: incorrect version %d, expecting %d\n", 1573 pim->pim_ver, PIM_VERSION); 1574 #endif 1575 m_freem(m); 1576 return(IPPROTO_DONE); 1577 } 1578 1579 if (pim->pim_type == PIM_REGISTER) { 1580 /* 1581 * since this is a REGISTER, we'll make a copy of the register 1582 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1583 * routing daemon. 1584 */ 1585 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1586 1587 struct mbuf *mcp; 1588 struct ip6_hdr *eip6; 1589 u_int32_t *reghdr; 1590 int rc; 1591 1592 ++pim6stat.pim6s_rcv_registers; 1593 1594 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1595 #ifdef MRT6DEBUG 1596 if (mrt6debug & DEBUG_PIM) 1597 log(LOG_DEBUG, 1598 "pim6_input: register mif not set: %d\n", 1599 reg_mif_num); 1600 #endif 1601 m_freem(m); 1602 return(IPPROTO_DONE); 1603 } 1604 1605 reghdr = (u_int32_t *)(pim + 1); 1606 1607 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1608 goto pim6_input_to_daemon; 1609 1610 /* 1611 * Validate length 1612 */ 1613 if (pimlen < PIM6_REG_MINLEN) { 1614 ++pim6stat.pim6s_rcv_tooshort; 1615 ++pim6stat.pim6s_rcv_badregisters; 1616 #ifdef MRT6DEBUG 1617 log(LOG_ERR, 1618 "pim6_input: register packet size too " 1619 "small %d from %s\n", 1620 pimlen, ip6_sprintf(&ip6->ip6_src)); 1621 #endif 1622 m_freem(m); 1623 return(IPPROTO_DONE); 1624 } 1625 1626 eip6 = (struct ip6_hdr *) (reghdr + 1); 1627 #ifdef MRT6DEBUG 1628 if (mrt6debug & DEBUG_PIM) 1629 log(LOG_DEBUG, 1630 "pim6_input[register], eip6: %s -> %s, " 1631 "eip6 plen %d\n", 1632 ip6_sprintf(&eip6->ip6_src), 1633 ip6_sprintf(&eip6->ip6_dst), 1634 ntohs(eip6->ip6_plen)); 1635 #endif 1636 1637 /* verify the inner packet is destined to a mcast group */ 1638 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1639 ++pim6stat.pim6s_rcv_badregisters; 1640 #ifdef MRT6DEBUG 1641 if (mrt6debug & DEBUG_PIM) 1642 log(LOG_DEBUG, 1643 "pim6_input: inner packet of register " 1644 "is not multicast %s\n", 1645 ip6_sprintf(&eip6->ip6_dst)); 1646 #endif 1647 m_freem(m); 1648 return(IPPROTO_DONE); 1649 } 1650 1651 /* 1652 * make a copy of the whole header to pass to the daemon later. 1653 */ 1654 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1655 if (mcp == NULL) { 1656 #ifdef MRT6DEBUG 1657 log(LOG_ERR, 1658 "pim6_input: pim register: " 1659 "could not copy register head\n"); 1660 #endif 1661 m_freem(m); 1662 return(IPPROTO_DONE); 1663 } 1664 1665 /* 1666 * forward the inner ip6 packet; point m_data at the inner ip6. 1667 */ 1668 m_adj(m, off + PIM_MINLEN); 1669 #ifdef MRT6DEBUG 1670 if (mrt6debug & DEBUG_PIM) { 1671 log(LOG_DEBUG, 1672 "pim6_input: forwarding decapsulated register: " 1673 "src %s, dst %s, mif %d\n", 1674 ip6_sprintf(&eip6->ip6_src), 1675 ip6_sprintf(&eip6->ip6_dst), 1676 reg_mif_num); 1677 } 1678 #endif 1679 1680 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1681 (struct sockaddr *) &dst, 1682 (struct rtentry *) NULL); 1683 1684 /* prepare the register head to send to the mrouting daemon */ 1685 m = mcp; 1686 } 1687 1688 /* 1689 * Pass the PIM message up to the daemon; if it is a register message 1690 * pass the 'head' only up to the daemon. This includes the 1691 * encapsulator ip6 header, pim header, register header and the 1692 * encapsulated ip6 header. 1693 */ 1694 pim6_input_to_daemon: 1695 rip6_input(&m, offp, proto); 1696 return(IPPROTO_DONE); 1697 } 1698
Indexes created Wed Sep 24 05:09:52 GMT 2025