ip6_mroute.c revision 1.8
1 /* $NetBSD: ip6_mroute.c,v 1.8 1999/12/13 15:17:22 itojun 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 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 48 #include "opt_inet.h" 49 #endif 50 51 #ifndef _KERNEL 52 # ifdef KERNEL 53 # define _KERNEL 54 # endif 55 #endif 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 60 #include <sys/malloc.h> 61 #endif 62 #include <sys/mbuf.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/sockio.h> 66 #include <sys/protosw.h> 67 #include <sys/errno.h> 68 #include <sys/time.h> 69 #include <sys/kernel.h> 70 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 71 #include <sys/ioctl.h> 72 #endif 73 #include <sys/syslog.h> 74 75 #include <net/if.h> 76 #include <net/route.h> 77 #include <net/raw_cb.h> 78 79 #include <netinet/in.h> 80 #include <netinet/in_var.h> 81 82 #include <netinet6/ip6.h> 83 #include <netinet6/ip6_var.h> 84 #include <netinet6/ip6_mroute.h> 85 #include <netinet6/pim6.h> 86 #include <netinet6/pim6_var.h> 87 88 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 89 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry"); 90 #endif 91 92 #define M_HASCL(m) ((m)->m_flags & M_EXT) 93 94 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 95 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 96 97 static int set_pim6 __P((int *)); 98 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 99 static int get_pim6 __P((struct mbuf *)); 100 #endif 101 static int socket_send __P((struct socket *, struct mbuf *, 102 struct sockaddr_in6 *)); 103 static int register_send __P((struct ip6_hdr *, struct mif6 *, 104 struct mbuf *)); 105 106 /* 107 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 108 * except for netstat or debugging purposes. 109 */ 110 struct socket *ip6_mrouter = NULL; 111 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 112 struct mrt6stat mrt6stat; 113 114 #define NO_RTE_FOUND 0x1 115 #define RTE_FOUND 0x2 116 117 struct mf6c *mf6ctable[MF6CTBLSIZ]; 118 u_char nexpire[MF6CTBLSIZ]; 119 static struct mif6 mif6table[MAXMIFS]; 120 #ifdef MRT6DEBUG 121 u_int mrt6debug = 0; /* debug level */ 122 #define DEBUG_MFC 0x02 123 #define DEBUG_FORWARD 0x04 124 #define DEBUG_EXPIRE 0x08 125 #define DEBUG_XMIT 0x10 126 #define DEBUG_REG 0x20 127 #define DEBUG_PIM 0x40 128 #endif 129 130 static void expire_upcalls __P((void *)); 131 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 132 #define UPCALL_EXPIRE 6 /* number of timeouts */ 133 134 #ifdef INET 135 #ifdef MROUTING 136 extern struct socket *ip_mrouter; 137 #endif 138 #endif 139 140 /* 141 * 'Interfaces' associated with decapsulator (so we can tell 142 * packets that went through it from ones that get reflected 143 * by a broken gateway). These interfaces are never linked into 144 * the system ifnet list & no routes point to them. I.e., packets 145 * can't be sent this way. They only exist as a placeholder for 146 * multicast source verification. 147 */ 148 struct ifnet multicast_register_if; 149 150 #define ENCAP_HOPS 64 151 152 /* 153 * Private variables. 154 */ 155 static mifi_t nummifs = 0; 156 static mifi_t reg_mif_num = (mifi_t)-1; 157 158 static struct pim6stat pim6stat; 159 160 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 161 static struct callout_handle expire_upcalls_ch; 162 #endif 163 164 /* 165 * one-back cache used by ipip_input to locate a tunnel's mif 166 * given a datagram's src ip address. 167 */ 168 static int pim6; 169 170 /* 171 * Hash function for a source, group entry 172 */ 173 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 174 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 175 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 176 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 177 178 /* 179 * Find a route for a given origin IPv6 address and Multicast group address. 180 * Quality of service parameter to be added in the future!!! 181 */ 182 183 #define MF6CFIND(o, g, rt) { \ 184 register struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 185 rt = NULL; \ 186 mrt6stat.mrt6s_mfc_lookups++; \ 187 while (_rt) { \ 188 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 189 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 190 (_rt->mf6c_stall == NULL)) { \ 191 rt = _rt; \ 192 break; \ 193 } \ 194 _rt = _rt->mf6c_next; \ 195 } \ 196 if (rt == NULL) { \ 197 mrt6stat.mrt6s_mfc_misses++; \ 198 } \ 199 } 200 201 /* 202 * Macros to compute elapsed time efficiently 203 * Borrowed from Van Jacobson's scheduling code 204 */ 205 #define TV_DELTA(a, b, delta) { \ 206 register int xxs; \ 207 \ 208 delta = (a).tv_usec - (b).tv_usec; \ 209 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 210 switch (xxs) { \ 211 case 2: \ 212 delta += 1000000; \ 213 /* fall through */ \ 214 case 1: \ 215 delta += 1000000; \ 216 break; \ 217 default: \ 218 delta += (1000000 * xxs); \ 219 } \ 220 } \ 221 } 222 223 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 224 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 225 226 #ifdef UPCALL_TIMING 227 #define UPCALL_MAX 50 228 u_long upcall_data[UPCALL_MAX + 1]; 229 static void collate(); 230 #endif /* UPCALL_TIMING */ 231 232 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 233 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 234 static int ip6_mrouter_init __P((struct socket *, struct mbuf *)); 235 static int add_m6if __P((struct mif6ctl *)); 236 static int del_m6if __P((mifi_t *)); 237 static int add_m6fc __P((struct mf6cctl *)); 238 static int del_m6fc __P((struct mf6cctl *)); 239 240 /* 241 * Handle MRT setsockopt commands to modify the multicast routing tables. 242 */ 243 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 244 int 245 ip6_mrouter_set(so, sopt) 246 struct socket *so; 247 struct sockopt *sopt; 248 { 249 int error = 0; 250 struct mbuf *m; 251 252 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 253 return (EACCES); 254 255 if (error = soopt_getm(sopt, &m)) /* XXX */ 256 return (error); 257 if (error = soopt_mcopyin(sopt, m)) /* XXX */ 258 return (error); 259 260 switch (sopt->sopt_name) { 261 case MRT6_INIT: 262 error = ip6_mrouter_init(so, m); 263 break; 264 case MRT6_DONE: 265 error = ip6_mrouter_done(); 266 break; 267 case MRT6_ADD_MIF: 268 error = add_m6if(mtod(m, struct mif6ctl *)); 269 break; 270 case MRT6_DEL_MIF: 271 error = del_m6if(mtod(m, mifi_t *)); 272 break; 273 case MRT6_ADD_MFC: 274 error = add_m6fc(mtod(m, struct mf6cctl *)); 275 break; 276 case MRT6_DEL_MFC: 277 error = del_m6fc(mtod(m, struct mf6cctl *)); 278 break; 279 case MRT6_PIM: 280 error = set_pim6(mtod(m, int *)); 281 break; 282 default: 283 error = EOPNOTSUPP; 284 break; 285 } 286 287 (void)m_freem(m); 288 return(error); 289 } 290 #else 291 int 292 ip6_mrouter_set(cmd, so, m) 293 int cmd; 294 struct socket *so; 295 struct mbuf *m; 296 { 297 if (cmd != MRT6_INIT && so != ip6_mrouter) 298 return EACCES; 299 300 switch (cmd) { 301 case MRT6_INIT: return ip6_mrouter_init(so, m); 302 case MRT6_DONE: return ip6_mrouter_done(); 303 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 304 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 305 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 306 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 307 case MRT6_PIM: return set_pim6(mtod(m, int *)); 308 default: return EOPNOTSUPP; 309 } 310 } 311 #endif 312 313 /* 314 * Handle MRT getsockopt commands 315 */ 316 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 317 int 318 ip6_mrouter_get(so, sopt) 319 struct socket *so; 320 struct sockopt *sopt; 321 { 322 int error = 0; 323 324 if (so != ip6_mrouter) return EACCES; 325 326 switch (sopt->sopt_name) { 327 case MRT6_PIM: 328 error = sooptcopyout(sopt, &pim6, sizeof(pim6)); 329 break; 330 } 331 return (error); 332 } 333 #else 334 int 335 ip6_mrouter_get(cmd, so, m) 336 int cmd; 337 struct socket *so; 338 struct mbuf **m; 339 { 340 struct mbuf *mb; 341 342 if (so != ip6_mrouter) return EACCES; 343 344 *m = mb = m_get(M_WAIT, MT_SOOPTS); 345 346 switch (cmd) { 347 case MRT6_PIM: return get_pim6(mb); 348 default: 349 m_free(mb); 350 return EOPNOTSUPP; 351 } 352 } 353 #endif 354 355 /* 356 * Handle ioctl commands to obtain information from the cache 357 */ 358 int 359 mrt6_ioctl(cmd, data) 360 int cmd; 361 caddr_t data; 362 { 363 int error = 0; 364 365 switch (cmd) { 366 case SIOCGETSGCNT_IN6: 367 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 368 break; /* for safety */ 369 case SIOCGETMIFCNT_IN6: 370 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 371 break; /* for safety */ 372 default: 373 return (EINVAL); 374 break; 375 } 376 return error; 377 } 378 379 /* 380 * returns the packet, byte, rpf-failure count for the source group provided 381 */ 382 static int 383 get_sg_cnt(req) 384 register struct sioc_sg_req6 *req; 385 { 386 register struct mf6c *rt; 387 int s; 388 389 #ifdef __NetBSD__ 390 s = splsoftnet(); 391 #else 392 s = splnet(); 393 #endif 394 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 395 splx(s); 396 if (rt != NULL) { 397 req->pktcnt = rt->mf6c_pkt_cnt; 398 req->bytecnt = rt->mf6c_byte_cnt; 399 req->wrong_if = rt->mf6c_wrong_if; 400 } else 401 return(ESRCH); 402 #if 0 403 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 404 #endif 405 406 return 0; 407 } 408 409 /* 410 * returns the input and output packet and byte counts on the mif provided 411 */ 412 static int 413 get_mif6_cnt(req) 414 register struct sioc_mif_req6 *req; 415 { 416 register mifi_t mifi = req->mifi; 417 418 if (mifi >= nummifs) 419 return EINVAL; 420 421 req->icount = mif6table[mifi].m6_pkt_in; 422 req->ocount = mif6table[mifi].m6_pkt_out; 423 req->ibytes = mif6table[mifi].m6_bytes_in; 424 req->obytes = mif6table[mifi].m6_bytes_out; 425 426 return 0; 427 } 428 429 #if !(defined(__FreeBSD__) && __FreeBSD__ >=3) 430 /* 431 * Get PIM processiong global 432 */ 433 static int 434 get_pim6(m) 435 struct mbuf *m; 436 { 437 int *i; 438 439 i = mtod(m, int *); 440 441 *i = pim6; 442 443 return 0; 444 } 445 #endif 446 447 static int 448 set_pim6(i) 449 int *i; 450 { 451 if ((*i != 1) && (*i != 0)) 452 return EINVAL; 453 454 pim6 = *i; 455 456 return 0; 457 } 458 459 /* 460 * Enable multicast routing 461 */ 462 static int 463 ip6_mrouter_init(so, m) 464 struct socket *so; 465 struct mbuf *m; 466 { 467 int *v; 468 469 #ifdef MRT6DEBUG 470 if (mrt6debug) 471 log(LOG_DEBUG, 472 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 473 so->so_type, so->so_proto->pr_protocol); 474 #endif 475 476 if (so->so_type != SOCK_RAW || 477 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 478 return EOPNOTSUPP; 479 480 if (!m || (m->m_len != sizeof(int *))) 481 return ENOPROTOOPT; 482 483 v = mtod(m, int *); 484 if (*v != 1) 485 return ENOPROTOOPT; 486 487 if (ip6_mrouter != NULL) return EADDRINUSE; 488 489 ip6_mrouter = so; 490 491 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 492 bzero((caddr_t)nexpire, sizeof(nexpire)); 493 494 pim6 = 0;/* used for stubbing out/in pim stuff */ 495 496 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 497 expire_upcalls_ch = 498 #endif 499 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 500 501 #ifdef MRT6DEBUG 502 if (mrt6debug) 503 log(LOG_DEBUG, "ip6_mrouter_init\n"); 504 #endif 505 506 return 0; 507 } 508 509 /* 510 * Disable multicast routing 511 */ 512 int 513 ip6_mrouter_done() 514 { 515 mifi_t mifi; 516 int i; 517 struct ifnet *ifp; 518 struct in6_ifreq ifr; 519 struct mf6c *rt; 520 struct rtdetq *rte; 521 int s; 522 523 #ifdef __NetBSD__ 524 s = splsoftnet(); 525 #else 526 s = splnet(); 527 #endif 528 529 /* 530 * For each phyint in use, disable promiscuous reception of all IPv6 531 * multicasts. 532 */ 533 #ifdef INET 534 #ifdef MROUTING 535 /* 536 * If there is still IPv4 multicast routing daemon, 537 * we remain interfaces to receive all muliticasted packets. 538 * XXX: there may be an interface in which the IPv4 multicast 539 * daemon is not interested... 540 */ 541 if (!ip_mrouter) 542 #endif 543 #endif 544 { 545 for (mifi = 0; mifi < nummifs; mifi++) { 546 if (mif6table[mifi].m6_ifp && 547 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 548 ifr.ifr_addr.sin6_family = AF_INET6; 549 ifr.ifr_addr.sin6_addr= in6addr_any; 550 ifp = mif6table[mifi].m6_ifp; 551 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 552 (caddr_t)&ifr); 553 } 554 } 555 } 556 #ifdef notyet 557 bzero((caddr_t)qtable, sizeof(qtable)); 558 bzero((caddr_t)tbftable, sizeof(tbftable)); 559 #endif 560 bzero((caddr_t)mif6table, sizeof(mif6table)); 561 nummifs = 0; 562 563 pim6 = 0; /* used to stub out/in pim specific code */ 564 565 untimeout(expire_upcalls, (caddr_t)NULL 566 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 567 , expire_upcalls_ch 568 #endif 569 ); 570 571 /* 572 * Free all multicast forwarding cache entries. 573 */ 574 for (i = 0; i < MF6CTBLSIZ; i++) { 575 rt = mf6ctable[i]; 576 while (rt) { 577 struct mf6c *frt; 578 579 for (rte = rt->mf6c_stall; rte != NULL; ) { 580 struct rtdetq *n = rte->next; 581 582 m_free(rte->m); 583 free(rte, M_MRTABLE); 584 rte = n; 585 } 586 frt = rt; 587 rt = rt->mf6c_next; 588 free(frt, M_MRTABLE); 589 } 590 } 591 592 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 593 594 /* 595 * Reset de-encapsulation cache 596 */ 597 reg_mif_num = -1; 598 599 ip6_mrouter = NULL; 600 601 splx(s); 602 603 #ifdef MRT6DEBUG 604 if (mrt6debug) 605 log(LOG_DEBUG, "ip6_mrouter_done\n"); 606 #endif 607 608 return 0; 609 } 610 611 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 612 613 /* 614 * Add a mif to the mif table 615 */ 616 static int 617 add_m6if(mifcp) 618 register struct mif6ctl *mifcp; 619 { 620 register struct mif6 *mifp; 621 struct ifnet *ifp; 622 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 623 struct in6_ifreq ifr; 624 #endif 625 int error, s; 626 #ifdef notyet 627 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 628 #endif 629 630 if (mifcp->mif6c_mifi >= MAXMIFS) 631 return EINVAL; 632 mifp = mif6table + mifcp->mif6c_mifi; 633 if (mifp->m6_ifp) 634 return EADDRINUSE; /* XXX: is it appropriate? */ 635 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 636 return ENXIO; 637 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 638 639 if (mifcp->mif6c_flags & MIFF_REGISTER) { 640 if (reg_mif_num == (mifi_t)-1) { 641 #if defined(__NetBSD__) || defined(__OpenBSD__) 642 strcpy(multicast_register_if.if_xname, 643 "register_mif"); /* XXX */ 644 #else 645 multicast_register_if.if_name = "register_mif"; 646 #endif 647 multicast_register_if.if_flags |= IFF_LOOPBACK; 648 multicast_register_if.if_index = mifcp->mif6c_mifi; 649 reg_mif_num = mifcp->mif6c_mifi; 650 } 651 652 ifp = &multicast_register_if; 653 654 } /* if REGISTER */ 655 else { 656 /* Make sure the interface supports multicast */ 657 if ((ifp->if_flags & IFF_MULTICAST) == 0) 658 return EOPNOTSUPP; 659 660 #ifdef __NetBSD__ 661 s = splsoftnet(); 662 #else 663 s = splnet(); 664 #endif 665 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) 666 error = if_allmulti(ifp, 1); 667 #else 668 /* 669 * Enable promiscuous reception of all IPv6 multicasts 670 * from the interface. 671 */ 672 ifr.ifr_addr.sin6_family = AF_INET6; 673 ifr.ifr_addr.sin6_addr = in6addr_any; 674 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 675 #endif 676 splx(s); 677 if (error) 678 return error; 679 } 680 681 #ifdef __NetBSD__ 682 s = splsoftnet(); 683 #else 684 s = splnet(); 685 #endif 686 mifp->m6_flags = mifcp->mif6c_flags; 687 mifp->m6_ifp = ifp; 688 #ifdef notyet 689 /* scaling up here allows division by 1024 in critical code */ 690 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 691 #endif 692 /* initialize per mif pkt counters */ 693 mifp->m6_pkt_in = 0; 694 mifp->m6_pkt_out = 0; 695 mifp->m6_bytes_in = 0; 696 mifp->m6_bytes_out = 0; 697 splx(s); 698 699 /* Adjust nummifs up if the mifi is higher than nummifs */ 700 if (nummifs <= mifcp->mif6c_mifi) 701 nummifs = mifcp->mif6c_mifi + 1; 702 703 #ifdef MRT6DEBUG 704 if (mrt6debug) 705 log(LOG_DEBUG, 706 "add_mif #%d, phyint %s%d\n", 707 mifcp->mif6c_mifi, 708 ifp->if_name, ifp->if_unit); 709 #endif 710 711 return 0; 712 } 713 714 /* 715 * Delete a mif from the mif table 716 */ 717 static int 718 del_m6if(mifip) 719 mifi_t *mifip; 720 { 721 register struct mif6 *mifp = mif6table + *mifip; 722 register mifi_t mifi; 723 struct ifnet *ifp; 724 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 725 struct in6_ifreq ifr; 726 #endif 727 int s; 728 729 if (*mifip >= nummifs) 730 return EINVAL; 731 if (mifp->m6_ifp == NULL) 732 return EINVAL; 733 734 #ifdef __NetBSD__ 735 s = splsoftnet(); 736 #else 737 s = splnet(); 738 #endif 739 740 if (!(mifp->m6_flags & MIFF_REGISTER)) { 741 /* 742 * XXX: what if there is yet IPv4 multicast daemon 743 * using the interface? 744 */ 745 ifp = mifp->m6_ifp; 746 747 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) 748 if_allmulti(ifp, 0); 749 #else 750 ifr.ifr_addr.sin6_family = AF_INET6; 751 ifr.ifr_addr.sin6_addr = in6addr_any; 752 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 753 #endif 754 } 755 756 #ifdef notyet 757 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 758 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 759 #endif 760 bzero((caddr_t)mifp, sizeof (*mifp)); 761 762 /* Adjust nummifs down */ 763 for (mifi = nummifs; mifi > 0; mifi--) 764 if (mif6table[mifi - 1].m6_ifp) 765 break; 766 nummifs = mifi; 767 768 splx(s); 769 770 #ifdef MRT6DEBUG 771 if (mrt6debug) 772 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 773 #endif 774 775 return 0; 776 } 777 778 /* 779 * Add an mfc entry 780 */ 781 static int 782 add_m6fc(mfccp) 783 struct mf6cctl *mfccp; 784 { 785 struct mf6c *rt; 786 u_long hash; 787 struct rtdetq *rte; 788 register u_short nstl; 789 int s; 790 791 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 792 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 793 794 /* If an entry already exists, just update the fields */ 795 if (rt) { 796 #ifdef MRT6DEBUG 797 if (mrt6debug & DEBUG_MFC) 798 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 799 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 800 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 801 mfccp->mf6cc_parent); 802 #endif 803 804 #ifdef __NetBSD__ 805 s = splsoftnet(); 806 #else 807 s = splnet(); 808 #endif 809 rt->mf6c_parent = mfccp->mf6cc_parent; 810 rt->mf6c_ifset = mfccp->mf6cc_ifset; 811 splx(s); 812 return 0; 813 } 814 815 /* 816 * Find the entry for which the upcall was made and update 817 */ 818 #ifdef __NetBSD__ 819 s = splsoftnet(); 820 #else 821 s = splnet(); 822 #endif 823 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 824 mfccp->mf6cc_mcastgrp.sin6_addr); 825 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 826 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 827 &mfccp->mf6cc_origin.sin6_addr) && 828 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 829 &mfccp->mf6cc_mcastgrp.sin6_addr) && 830 (rt->mf6c_stall != NULL)) { 831 832 if (nstl++) 833 log(LOG_ERR, 834 "add_m6fc: %s o %s g %s p %x dbx %p\n", 835 "multiple kernel entries", 836 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 837 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 838 mfccp->mf6cc_parent, rt->mf6c_stall); 839 840 #ifdef MRT6DEBUG 841 if (mrt6debug & DEBUG_MFC) 842 log(LOG_DEBUG, 843 "add_m6fc o %s g %s p %x dbg %x\n", 844 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 845 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 846 mfccp->mf6cc_parent, rt->mf6c_stall); 847 #endif 848 849 rt->mf6c_origin = mfccp->mf6cc_origin; 850 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 851 rt->mf6c_parent = mfccp->mf6cc_parent; 852 rt->mf6c_ifset = mfccp->mf6cc_ifset; 853 /* initialize pkt counters per src-grp */ 854 rt->mf6c_pkt_cnt = 0; 855 rt->mf6c_byte_cnt = 0; 856 rt->mf6c_wrong_if = 0; 857 858 rt->mf6c_expire = 0; /* Don't clean this guy up */ 859 nexpire[hash]--; 860 861 /* free packets Qed at the end of this entry */ 862 for (rte = rt->mf6c_stall; rte != NULL; ) { 863 struct rtdetq *n = rte->next; 864 ip6_mdq(rte->m, rte->ifp, rt); 865 m_freem(rte->m); 866 #ifdef UPCALL_TIMING 867 collate(&(rte->t)); 868 #endif /* UPCALL_TIMING */ 869 free(rte, M_MRTABLE); 870 rte = n; 871 } 872 rt->mf6c_stall = NULL; 873 } 874 } 875 876 /* 877 * It is possible that an entry is being inserted without an upcall 878 */ 879 if (nstl == 0) { 880 #ifdef MRT6DEBUG 881 if (mrt6debug & DEBUG_MFC) 882 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 883 hash, 884 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 885 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 886 mfccp->mf6cc_parent); 887 #endif 888 889 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 890 891 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 892 &mfccp->mf6cc_origin.sin6_addr)&& 893 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 894 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 895 896 rt->mf6c_origin = mfccp->mf6cc_origin; 897 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 898 rt->mf6c_parent = mfccp->mf6cc_parent; 899 /* initialize pkt counters per src-grp */ 900 rt->mf6c_pkt_cnt = 0; 901 rt->mf6c_byte_cnt = 0; 902 rt->mf6c_wrong_if = 0; 903 904 if (rt->mf6c_expire) 905 nexpire[hash]--; 906 rt->mf6c_expire = 0; 907 } 908 } 909 if (rt == NULL) { 910 /* no upcall, so make a new entry */ 911 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 912 M_NOWAIT); 913 if (rt == NULL) { 914 splx(s); 915 return ENOBUFS; 916 } 917 918 /* insert new entry at head of hash chain */ 919 rt->mf6c_origin = mfccp->mf6cc_origin; 920 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 921 rt->mf6c_parent = mfccp->mf6cc_parent; 922 /* initialize pkt counters per src-grp */ 923 rt->mf6c_pkt_cnt = 0; 924 rt->mf6c_byte_cnt = 0; 925 rt->mf6c_wrong_if = 0; 926 rt->mf6c_expire = 0; 927 rt->mf6c_stall = NULL; 928 929 /* link into table */ 930 rt->mf6c_next = mf6ctable[hash]; 931 mf6ctable[hash] = rt; 932 } 933 } 934 splx(s); 935 return 0; 936 } 937 938 #ifdef UPCALL_TIMING 939 /* 940 * collect delay statistics on the upcalls 941 */ 942 static void 943 collate(t) 944 register struct timeval *t; 945 { 946 register u_long d; 947 register struct timeval tp; 948 register u_long delta; 949 950 GET_TIME(tp); 951 952 if (TV_LT(*t, tp)) 953 { 954 TV_DELTA(tp, *t, delta); 955 956 d = delta >> 10; 957 if (d > UPCALL_MAX) 958 d = UPCALL_MAX; 959 960 ++upcall_data[d]; 961 } 962 } 963 #endif /* UPCALL_TIMING */ 964 965 /* 966 * Delete an mfc entry 967 */ 968 static int 969 del_m6fc(mfccp) 970 struct mf6cctl *mfccp; 971 { 972 struct sockaddr_in6 origin; 973 struct sockaddr_in6 mcastgrp; 974 struct mf6c *rt; 975 struct mf6c **nptr; 976 u_long hash; 977 int s; 978 979 origin = mfccp->mf6cc_origin; 980 mcastgrp = mfccp->mf6cc_mcastgrp; 981 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 982 983 #ifdef MRT6DEBUG 984 if (mrt6debug & DEBUG_MFC) 985 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 986 ip6_sprintf(&origin.sin6_addr), 987 ip6_sprintf(&mcastgrp.sin6_addr)); 988 #endif 989 990 #ifdef __NetBSD__ 991 s = splsoftnet(); 992 #else 993 s = splnet(); 994 #endif 995 996 nptr = &mf6ctable[hash]; 997 while ((rt = *nptr) != NULL) { 998 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 999 &rt->mf6c_origin.sin6_addr) && 1000 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1001 &rt->mf6c_mcastgrp.sin6_addr) && 1002 rt->mf6c_stall == NULL) 1003 break; 1004 1005 nptr = &rt->mf6c_next; 1006 } 1007 if (rt == NULL) { 1008 splx(s); 1009 return EADDRNOTAVAIL; 1010 } 1011 1012 *nptr = rt->mf6c_next; 1013 free(rt, M_MRTABLE); 1014 1015 splx(s); 1016 1017 return 0; 1018 } 1019 1020 static int 1021 socket_send(s, mm, src) 1022 struct socket *s; 1023 struct mbuf *mm; 1024 struct sockaddr_in6 *src; 1025 { 1026 if (s) { 1027 if (sbappendaddr(&s->so_rcv, 1028 (struct sockaddr *)src, 1029 mm, (struct mbuf *)0) != 0) { 1030 sorwakeup(s); 1031 return 0; 1032 } 1033 } 1034 m_freem(mm); 1035 return -1; 1036 } 1037 1038 /* 1039 * IPv6 multicast forwarding function. This function assumes that the packet 1040 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1041 * pointed to by "ifp", and the packet is to be relayed to other networks 1042 * that have members of the packet's destination IPv6 multicast group. 1043 * 1044 * The packet is returned unscathed to the caller, unless it is 1045 * erroneous, in which case a non-zero return value tells the caller to 1046 * discard it. 1047 */ 1048 1049 int 1050 ip6_mforward(ip6, ifp, m) 1051 register struct ip6_hdr *ip6; 1052 struct ifnet *ifp; 1053 struct mbuf *m; 1054 { 1055 register struct mf6c *rt; 1056 register struct mif6 *mifp; 1057 register struct mbuf *mm; 1058 int s; 1059 mifi_t mifi; 1060 1061 #ifdef MRT6DEBUG 1062 if (mrt6debug & DEBUG_FORWARD) 1063 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1064 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 1065 ifp->if_index); 1066 #endif 1067 1068 /* 1069 * Don't forward a packet with Hop limit of zero or one, 1070 * or a packet destined to a local-only group. 1071 */ 1072 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 1073 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1074 return 0; 1075 ip6->ip6_hlim--; 1076 1077 /* 1078 * Determine forwarding mifs from the forwarding cache table 1079 */ 1080 #ifdef __NetBSD__ 1081 s = splsoftnet(); 1082 #else 1083 s = splnet(); 1084 #endif 1085 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1086 1087 /* Entry exists, so forward if necessary */ 1088 if (rt) { 1089 splx(s); 1090 return (ip6_mdq(m, ifp, rt)); 1091 } else { 1092 /* 1093 * If we don't have a route for packet's origin, 1094 * Make a copy of the packet & 1095 * send message to routing daemon 1096 */ 1097 1098 register struct mbuf *mb0; 1099 register struct rtdetq *rte; 1100 register u_long hash; 1101 /* register int i, npkts;*/ 1102 #ifdef UPCALL_TIMING 1103 struct timeval tp; 1104 1105 GET_TIME(tp); 1106 #endif /* UPCALL_TIMING */ 1107 1108 mrt6stat.mrt6s_no_route++; 1109 #ifdef MRT6DEBUG 1110 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1111 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1112 ip6_sprintf(&ip6->ip6_src), 1113 ip6_sprintf(&ip6->ip6_dst)); 1114 #endif 1115 1116 /* 1117 * Allocate mbufs early so that we don't do extra work if we 1118 * are just going to fail anyway. 1119 */ 1120 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1121 M_NOWAIT); 1122 if (rte == NULL) { 1123 splx(s); 1124 return ENOBUFS; 1125 } 1126 mb0 = m_copy(m, 0, M_COPYALL); 1127 /* 1128 * Pullup packet header if needed before storing it, 1129 * as other references may modify it in the meantime. 1130 */ 1131 if (mb0 && 1132 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1133 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1134 if (mb0 == NULL) { 1135 free(rte, M_MRTABLE); 1136 splx(s); 1137 return ENOBUFS; 1138 } 1139 1140 /* is there an upcall waiting for this packet? */ 1141 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1142 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1143 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1144 &rt->mf6c_origin.sin6_addr) && 1145 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1146 &rt->mf6c_mcastgrp.sin6_addr) && 1147 (rt->mf6c_stall != NULL)) 1148 break; 1149 } 1150 1151 if (rt == NULL) { 1152 struct mrt6msg *im; 1153 1154 /* no upcall, so make a new entry */ 1155 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1156 M_NOWAIT); 1157 if (rt == NULL) { 1158 free(rte, M_MRTABLE); 1159 m_freem(mb0); 1160 splx(s); 1161 return ENOBUFS; 1162 } 1163 /* 1164 * Make a copy of the header to send to the user 1165 * level process 1166 */ 1167 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1168 1169 if (mm == NULL) { 1170 free(rte, M_MRTABLE); 1171 m_freem(mb0); 1172 free(rt, M_MRTABLE); 1173 splx(s); 1174 return ENOBUFS; 1175 } 1176 1177 /* 1178 * Send message to routing daemon 1179 */ 1180 sin6.sin6_addr = ip6->ip6_src; 1181 1182 im = mtod(mm, struct mrt6msg *); 1183 im->im6_msgtype = MRT6MSG_NOCACHE; 1184 im->im6_mbz = 0; 1185 1186 #ifdef MRT6DEBUG 1187 if (mrt6debug & DEBUG_FORWARD) 1188 log(LOG_DEBUG, 1189 "getting the iif info in the kernel\n"); 1190 #endif 1191 1192 for (mifp = mif6table, mifi = 0; 1193 mifi < nummifs && mifp->m6_ifp != ifp; 1194 mifp++, mifi++) 1195 ; 1196 1197 im->im6_mif = mifi; 1198 1199 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1200 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1201 "socket queue full\n"); 1202 mrt6stat.mrt6s_upq_sockfull++; 1203 free(rte, M_MRTABLE); 1204 m_freem(mb0); 1205 free(rt, M_MRTABLE); 1206 splx(s); 1207 return ENOBUFS; 1208 } 1209 1210 mrt6stat.mrt6s_upcalls++; 1211 1212 /* insert new entry at head of hash chain */ 1213 bzero(rt, sizeof(*rt)); 1214 rt->mf6c_origin.sin6_family = AF_INET6; 1215 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1216 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1217 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1218 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1219 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1220 rt->mf6c_expire = UPCALL_EXPIRE; 1221 nexpire[hash]++; 1222 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1223 1224 /* link into table */ 1225 rt->mf6c_next = mf6ctable[hash]; 1226 mf6ctable[hash] = rt; 1227 /* Add this entry to the end of the queue */ 1228 rt->mf6c_stall = rte; 1229 } else { 1230 /* determine if q has overflowed */ 1231 struct rtdetq **p; 1232 register int npkts = 0; 1233 1234 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1235 if (++npkts > MAX_UPQ6) { 1236 mrt6stat.mrt6s_upq_ovflw++; 1237 free(rte, M_MRTABLE); 1238 m_freem(mb0); 1239 splx(s); 1240 return 0; 1241 } 1242 1243 /* Add this entry to the end of the queue */ 1244 *p = rte; 1245 } 1246 1247 rte->next = NULL; 1248 rte->m = mb0; 1249 rte->ifp = ifp; 1250 #ifdef UPCALL_TIMING 1251 rte->t = tp; 1252 #endif /* UPCALL_TIMING */ 1253 1254 splx(s); 1255 1256 return 0; 1257 } 1258 } 1259 1260 /* 1261 * Clean up cache entries if upcalls are not serviced 1262 * Call from the Slow Timeout mechanism, every half second. 1263 */ 1264 static void 1265 expire_upcalls(unused) 1266 void *unused; 1267 { 1268 struct rtdetq *rte; 1269 struct mf6c *mfc, **nptr; 1270 int i; 1271 int s; 1272 1273 #ifdef __NetBSD__ 1274 s = splsoftnet(); 1275 #else 1276 s = splnet(); 1277 #endif 1278 for (i = 0; i < MF6CTBLSIZ; i++) { 1279 if (nexpire[i] == 0) 1280 continue; 1281 nptr = &mf6ctable[i]; 1282 while ((mfc = *nptr) != NULL) { 1283 rte = mfc->mf6c_stall; 1284 /* 1285 * Skip real cache entries 1286 * Make sure it wasn't marked to not expire (shouldn't happen) 1287 * If it expires now 1288 */ 1289 if (rte != NULL && 1290 mfc->mf6c_expire != 0 && 1291 --mfc->mf6c_expire == 0) { 1292 #ifdef MRT6DEBUG 1293 if (mrt6debug & DEBUG_EXPIRE) 1294 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1295 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1296 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1297 #endif 1298 /* 1299 * drop all the packets 1300 * free the mbuf with the pkt, if, timing info 1301 */ 1302 do { 1303 struct rtdetq *n = rte->next; 1304 m_freem(rte->m); 1305 free(rte, M_MRTABLE); 1306 rte = n; 1307 } while (rte != NULL); 1308 mrt6stat.mrt6s_cache_cleanups++; 1309 nexpire[i]--; 1310 1311 *nptr = mfc->mf6c_next; 1312 free(mfc, M_MRTABLE); 1313 } else { 1314 nptr = &mfc->mf6c_next; 1315 } 1316 } 1317 } 1318 splx(s); 1319 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1320 expire_upcalls_ch = 1321 #endif 1322 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 1323 } 1324 1325 /* 1326 * Packet forwarding routine once entry in the cache is made 1327 */ 1328 static int 1329 ip6_mdq(m, ifp, rt) 1330 register struct mbuf *m; 1331 register struct ifnet *ifp; 1332 register struct mf6c *rt; 1333 { 1334 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1335 register mifi_t mifi, iif; 1336 register struct mif6 *mifp; 1337 register int plen = m->m_pkthdr.len; 1338 1339 /* 1340 * Macro to send packet on mif. Since RSVP packets don't get counted on 1341 * input, they shouldn't get counted on output, so statistics keeping is 1342 * seperate. 1343 */ 1344 1345 #define MC6_SEND(ip6,mifp,m) { \ 1346 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1347 register_send((ip6), (mifp), (m)); \ 1348 else \ 1349 phyint_send((ip6), (mifp), (m)); \ 1350 } 1351 1352 /* 1353 * Don't forward if it didn't arrive from the parent mif 1354 * for its origin. 1355 */ 1356 mifi = rt->mf6c_parent; 1357 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1358 /* came in the wrong interface */ 1359 #ifdef MRT6DEBUG 1360 if (mrt6debug & DEBUG_FORWARD) 1361 log(LOG_DEBUG, 1362 "wrong if: ifid %d mifi %d mififid %x\n", 1363 ifp->if_index, mifi, 1364 mif6table[mifi].m6_ifp->if_index); 1365 #endif 1366 mrt6stat.mrt6s_wrong_if++; 1367 rt->mf6c_wrong_if++; 1368 /* 1369 * If we are doing PIM processing, and we are forwarding 1370 * packets on this interface, send a message to the 1371 * routing daemon. 1372 */ 1373 if(mifi < nummifs) /* have to make sure this is a valid mif */ 1374 if(mif6table[mifi].m6_ifp) 1375 1376 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1377 /* 1378 * Check the M_LOOP flag to avoid an 1379 * unnecessary PIM assert. 1380 * XXX: M_LOOP is an ad-hoc hack... 1381 */ 1382 static struct sockaddr_in6 sin6 = 1383 { sizeof(sin6), AF_INET6 }; 1384 1385 register struct mbuf *mm; 1386 struct mrt6msg *im; 1387 1388 mm = m_copy(m, 0, 1389 sizeof(struct ip6_hdr)); 1390 if (mm && 1391 (M_HASCL(mm) || 1392 mm->m_len < sizeof(struct ip6_hdr))) 1393 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1394 if (mm == NULL) 1395 return ENOBUFS; 1396 1397 im = mtod(mm, struct mrt6msg *); 1398 im->im6_msgtype = MRT6MSG_WRONGMIF; 1399 im->im6_mbz = 0; 1400 1401 for (mifp = mif6table, iif = 0; 1402 iif < nummifs && mifp && 1403 mifp->m6_ifp != ifp; 1404 mifp++, iif++); 1405 1406 im->im6_mif = iif; 1407 1408 sin6.sin6_addr = im->im6_src; 1409 1410 mrt6stat.mrt6s_upcalls++; 1411 1412 if (socket_send(ip6_mrouter, mm, 1413 &sin6) < 0) { 1414 #ifdef MRT6DEBUG 1415 if (mrt6debug) 1416 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1417 #endif 1418 ++mrt6stat.mrt6s_upq_sockfull; 1419 return ENOBUFS; 1420 } /* if socket Q full */ 1421 } /* if PIM */ 1422 return 0; 1423 } /* if wrong iif */ 1424 1425 /* If I sourced this packet, it counts as output, else it was input. */ 1426 if (m->m_pkthdr.rcvif == NULL) { 1427 /* XXX: is rcvif really NULL when output?? */ 1428 mif6table[mifi].m6_pkt_out++; 1429 mif6table[mifi].m6_bytes_out += plen; 1430 } else { 1431 mif6table[mifi].m6_pkt_in++; 1432 mif6table[mifi].m6_bytes_in += plen; 1433 } 1434 rt->mf6c_pkt_cnt++; 1435 rt->mf6c_byte_cnt += plen; 1436 1437 /* 1438 * For each mif, forward a copy of the packet if there are group 1439 * members downstream on the interface. 1440 */ 1441 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1442 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1443 mifp->m6_pkt_out++; 1444 mifp->m6_bytes_out += plen; 1445 MC6_SEND(ip6, mifp, m); 1446 } 1447 return 0; 1448 } 1449 1450 static void 1451 phyint_send(ip6, mifp, m) 1452 struct ip6_hdr *ip6; 1453 struct mif6 *mifp; 1454 struct mbuf *m; 1455 { 1456 register struct mbuf *mb_copy; 1457 struct ifnet *ifp = mifp->m6_ifp; 1458 int error = 0; 1459 #ifdef __NetBSD__ 1460 int s = splsoftnet(); 1461 #else 1462 int s = splnet(); 1463 #endif 1464 static struct route_in6 ro6; 1465 struct in6_multi *in6m; 1466 1467 /* 1468 * Make a new reference to the packet; make sure that 1469 * the IPv6 header is actually copied, not just referenced, 1470 * so that ip6_output() only scribbles on the copy. 1471 */ 1472 mb_copy = m_copy(m, 0, M_COPYALL); 1473 if (mb_copy && 1474 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1475 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1476 if (mb_copy == NULL) 1477 return; 1478 /* set MCAST flag to the outgoing packet */ 1479 mb_copy->m_flags |= M_MCAST; 1480 1481 /* 1482 * If we sourced the packet, call ip6_output since we may devide 1483 * the packet into fragments when the packet is too big for the 1484 * outgoing interface. 1485 * Otherwise, we can simply send the packet to the interface 1486 * sending queue. 1487 */ 1488 if (m->m_pkthdr.rcvif == NULL) { 1489 struct ip6_moptions im6o; 1490 1491 im6o.im6o_multicast_ifp = ifp; 1492 /* XXX: ip6_output will override ip6->ip6_hlim */ 1493 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1494 im6o.im6o_multicast_loop = 1; 1495 error = ip6_output(mb_copy, NULL, &ro6, 1496 IPV6_FORWARDING, &im6o, NULL); 1497 1498 #ifdef MRT6DEBUG 1499 if (mrt6debug & DEBUG_XMIT) 1500 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1501 mifp - mif6table, error); 1502 #endif 1503 splx(s); 1504 return; 1505 } 1506 1507 /* 1508 * If we belong to the destination multicast group 1509 * on the outgoing interface, loop back a copy. 1510 */ 1511 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1512 if (in6m != NULL) { 1513 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1514 ro6.ro_dst.sin6_family = AF_INET6; 1515 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1516 ip6_mloopback(ifp, m, &ro6.ro_dst); 1517 } 1518 /* 1519 * Put the packet into the sending queue of the outgoing interface 1520 * if it would fit in the MTU of the interface. 1521 */ 1522 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1523 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1524 ro6.ro_dst.sin6_family = AF_INET6; 1525 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1526 /* 1527 * We just call if_output instead of nd6_output here, since 1528 * we need no ND for a multicast forwarded packet...right? 1529 */ 1530 error = (*ifp->if_output)(ifp, mb_copy, 1531 (struct sockaddr *)&ro6.ro_dst, 1532 NULL); 1533 #ifdef MRT6DEBUG 1534 if (mrt6debug & DEBUG_XMIT) 1535 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1536 mifp - mif6table, error); 1537 #endif 1538 } 1539 else { 1540 #ifdef MULTICAST_PMTUD 1541 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1542 return; 1543 #else 1544 #ifdef MRT6DEBUG 1545 #ifdef __NetBSD__ 1546 if (mrt6debug & DEBUG_DEBUG_XMIT) 1547 log(LOG_DEBUG, 1548 "phyint_send: packet too big on %s o %s g %s" 1549 " size %d(discarded)\n", 1550 ifp->if_xname, 1551 ip6_sprintf(&ip6->ip6_src), 1552 ip6_sprintf(&ip6->ip6_dst), 1553 mb_copy->m_pkthdr.len); 1554 #else 1555 if (mrt6debug & DEBUG_XMIT) 1556 log(LOG_DEBUG, 1557 "phyint_send: packet too big on %s%u o %s g %s" 1558 " size %d(discarded)\n", 1559 ifp->if_name, ifp->if_unit, 1560 ip6_sprintf(&ip6->ip6_src), 1561 ip6_sprintf(&ip6->ip6_dst), 1562 mb_copy->m_pkthdr.len); 1563 #endif /* __NetBSD__ */ 1564 #endif /* MRT6DEBUG */ 1565 m_freem(mb_copy); /* simply discard the packet */ 1566 return; 1567 #endif 1568 } 1569 } 1570 1571 static int 1572 register_send(ip6, mif, m) 1573 register struct ip6_hdr *ip6; 1574 struct mif6 *mif; 1575 register struct mbuf *m; 1576 { 1577 register struct mbuf *mm; 1578 register int i, len = m->m_pkthdr.len; 1579 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1580 struct mrt6msg *im6; 1581 1582 #ifdef MRT6DEBUG 1583 if (mrt6debug) 1584 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1585 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1586 #endif 1587 ++pim6stat.pim6s_snd_registers; 1588 1589 /* Make a copy of the packet to send to the user level process */ 1590 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1591 if (mm == NULL) 1592 return ENOBUFS; 1593 mm->m_data += max_linkhdr; 1594 mm->m_len = sizeof(struct ip6_hdr); 1595 1596 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1597 m_freem(mm); 1598 return ENOBUFS; 1599 } 1600 i = MHLEN - M_LEADINGSPACE(mm); 1601 if (i > len) 1602 i = len; 1603 mm = m_pullup(mm, i); 1604 if (mm == NULL){ 1605 m_freem(mm); 1606 return ENOBUFS; 1607 } 1608 /* TODO: check it! */ 1609 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1610 1611 /* 1612 * Send message to routing daemon 1613 */ 1614 sin6.sin6_addr = ip6->ip6_src; 1615 1616 im6 = mtod(mm, struct mrt6msg *); 1617 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1618 im6->im6_mbz = 0; 1619 1620 im6->im6_mif = mif - mif6table; 1621 1622 /* iif info is not given for reg. encap.n */ 1623 mrt6stat.mrt6s_upcalls++; 1624 1625 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1626 #ifdef MRT6DEBUG 1627 if (mrt6debug) 1628 log(LOG_WARNING, 1629 "register_send: ip_mrouter socket queue full\n"); 1630 #endif 1631 ++mrt6stat.mrt6s_upq_sockfull; 1632 return ENOBUFS; 1633 } 1634 return 0; 1635 } 1636 1637 /* 1638 * PIM sparse mode hook 1639 * Receives the pim control messages, and passes them up to the listening 1640 * socket, using rip6_input. 1641 * The only message processed is the REGISTER pim message; the pim header 1642 * is stripped off, and the inner packet is passed to register_mforward. 1643 */ 1644 int 1645 pim6_input(mp, offp, proto) 1646 struct mbuf **mp; 1647 int *offp, proto; 1648 { 1649 register struct pim *pim; /* pointer to a pim struct */ 1650 register struct ip6_hdr *ip6; 1651 register int pimlen; 1652 struct mbuf *m = *mp; 1653 int minlen; 1654 int off = *offp; 1655 1656 ++pim6stat.pim6s_rcv_total; 1657 1658 ip6 = mtod(m, struct ip6_hdr *); 1659 pimlen = m->m_pkthdr.len - *offp; 1660 1661 /* 1662 * Validate lengths 1663 */ 1664 if (pimlen < PIM_MINLEN) { 1665 ++pim6stat.pim6s_rcv_tooshort; 1666 #ifdef MRT6DEBUG 1667 if (mrt6debug & DEBUG_PIM) 1668 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1669 #endif 1670 m_freem(m); 1671 return(IPPROTO_DONE); 1672 } 1673 1674 /* 1675 * if the packet is at least as big as a REGISTER, go ahead 1676 * and grab the PIM REGISTER header size, to avoid another 1677 * possible m_pullup() later. 1678 * 1679 * PIM_MINLEN == pimhdr + u_int32 == 8 1680 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1681 */ 1682 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1683 1684 /* 1685 * Make sure that the IP6 and PIM headers in contiguous memory, and 1686 * possibly the PIM REGISTER header 1687 */ 1688 #ifndef PULLDOWN_TEST 1689 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1690 /* adjust pointer */ 1691 ip6 = mtod(m, struct ip6_hdr *); 1692 1693 /* adjust mbuf to point to the PIM header */ 1694 pim = (struct pim *)((caddr_t)ip6 + off); 1695 #else 1696 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1697 if (pim == NULL) { 1698 pim6stat.pim6s_rcv_tooshort++; 1699 return IPPROTO_DONE; 1700 } 1701 #endif 1702 1703 #define PIM6_CHECKSUM 1704 #ifdef PIM6_CHECKSUM 1705 { 1706 int cksumlen; 1707 1708 /* 1709 * Validate checksum. 1710 * If PIM REGISTER, exclude the data packet 1711 */ 1712 if (pim->pim_type == PIM_REGISTER) 1713 cksumlen = PIM_MINLEN; 1714 else 1715 cksumlen = pimlen; 1716 1717 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1718 ++pim6stat.pim6s_rcv_badsum; 1719 #ifdef MRT6DEBUG 1720 if (mrt6debug & DEBUG_PIM) 1721 log(LOG_DEBUG, 1722 "pim6_input: invalid checksum\n"); 1723 #endif 1724 m_freem(m); 1725 return(IPPROTO_DONE); 1726 } 1727 } 1728 #endif /* PIM_CHECKSUM */ 1729 1730 /* PIM version check */ 1731 if (pim->pim_ver != PIM_VERSION) { 1732 ++pim6stat.pim6s_rcv_badversion; 1733 #ifdef MRT6DEBUG 1734 log(LOG_ERR, 1735 "pim6_input: incorrect version %d, expecting %d\n", 1736 pim->pim_ver, PIM_VERSION); 1737 #endif 1738 m_freem(m); 1739 return(IPPROTO_DONE); 1740 } 1741 1742 if (pim->pim_type == PIM_REGISTER) { 1743 /* 1744 * since this is a REGISTER, we'll make a copy of the register 1745 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1746 * routing daemon. 1747 */ 1748 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1749 1750 struct mbuf *mcp; 1751 struct ip6_hdr *eip6; 1752 u_int32_t *reghdr; 1753 int rc; 1754 1755 ++pim6stat.pim6s_rcv_registers; 1756 1757 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1758 #ifdef MRT6DEBUG 1759 if (mrt6debug & DEBUG_PIM) 1760 log(LOG_DEBUG, 1761 "pim6_input: register mif not set: %d\n", 1762 reg_mif_num); 1763 #endif 1764 m_freem(m); 1765 return(IPPROTO_DONE); 1766 } 1767 1768 reghdr = (u_int32_t *)(pim + 1); 1769 1770 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1771 goto pim6_input_to_daemon; 1772 1773 /* 1774 * Validate length 1775 */ 1776 if (pimlen < PIM6_REG_MINLEN) { 1777 ++pim6stat.pim6s_rcv_tooshort; 1778 ++pim6stat.pim6s_rcv_badregisters; 1779 #ifdef MRT6DEBUG 1780 log(LOG_ERR, 1781 "pim6_input: register packet size too " 1782 "small %d from %s\n", 1783 pimlen, ip6_sprintf(&ip6->ip6_src)); 1784 #endif 1785 m_freem(m); 1786 return(IPPROTO_DONE); 1787 } 1788 1789 eip6 = (struct ip6_hdr *) (reghdr + 1); 1790 #ifdef MRT6DEBUG 1791 if (mrt6debug & DEBUG_PIM) 1792 log(LOG_DEBUG, 1793 "pim6_input[register], eip6: %s -> %s, " 1794 "eip6 plen %d\n", 1795 ip6_sprintf(&eip6->ip6_src), 1796 ip6_sprintf(&eip6->ip6_dst), 1797 ntohs(eip6->ip6_plen)); 1798 #endif 1799 1800 /* verify the inner packet is destined to a mcast group */ 1801 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1802 ++pim6stat.pim6s_rcv_badregisters; 1803 #ifdef MRT6DEBUG 1804 if (mrt6debug & DEBUG_PIM) 1805 log(LOG_DEBUG, 1806 "pim6_input: inner packet of register " 1807 "is not multicast %s\n", 1808 ip6_sprintf(&eip6->ip6_dst)); 1809 #endif 1810 m_freem(m); 1811 return(IPPROTO_DONE); 1812 } 1813 1814 /* 1815 * make a copy of the whole header to pass to the daemon later. 1816 */ 1817 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1818 if (mcp == NULL) { 1819 #ifdef MRT6DEBUG 1820 log(LOG_ERR, 1821 "pim6_input: pim register: " 1822 "could not copy register head\n"); 1823 #endif 1824 m_freem(m); 1825 return(IPPROTO_DONE); 1826 } 1827 1828 /* 1829 * forward the inner ip6 packet; point m_data at the inner ip6. 1830 */ 1831 m_adj(m, off + PIM_MINLEN); 1832 #ifdef MRT6DEBUG 1833 if (mrt6debug & DEBUG_PIM) { 1834 log(LOG_DEBUG, 1835 "pim6_input: forwarding decapsulated register: " 1836 "src %s, dst %s, mif %d\n", 1837 ip6_sprintf(&eip6->ip6_src), 1838 ip6_sprintf(&eip6->ip6_dst), 1839 reg_mif_num); 1840 } 1841 #endif 1842 1843 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1844 (struct sockaddr *) &dst, 1845 (struct rtentry *) NULL); 1846 1847 /* prepare the register head to send to the mrouting daemon */ 1848 m = mcp; 1849 } 1850 1851 /* 1852 * Pass the PIM message up to the daemon; if it is a register message 1853 * pass the 'head' only up to the daemon. This includes the 1854 * encapsulator ip6 header, pim header, register header and the 1855 * encapsulated ip6 header. 1856 */ 1857 pim6_input_to_daemon: 1858 rip6_input(&m, offp, proto); 1859 return(IPPROTO_DONE); 1860 } 1861
Indexes created Tue Sep 23 07:09:52 GMT 2025