ip6_mroute.c revision 83709
1/* $FreeBSD: head/sys/netinet6/ip6_mroute.c 83709 2001-09-20 08:04:21Z sumikawa $ */ 2/* $KAME: ip6_mroute.c,v 1.46 2001/04/04 05:17:30 itojun Exp $ */ 3 4/* 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ 34 35/* 36 * IP multicast forwarding procedures 37 * 38 * Written by David Waitzman, BBN Labs, August 1988. 39 * Modified by Steve Deering, Stanford, February 1989. 40 * Modified by Mark J. Steiglitz, Stanford, May, 1991 41 * Modified by Van Jacobson, LBL, January 1993 42 * Modified by Ajit Thyagarajan, PARC, August 1993 43 * Modified by Bill Fenenr, PARC, April 1994 44 * 45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 46 */ 47 48#include "opt_inet.h" 49#include "opt_inet6.h" 50 51#include <sys/param.h> 52#include <sys/systm.h> 53#include <sys/callout.h> 54#include <sys/malloc.h> 55#include <sys/mbuf.h> 56#include <sys/socket.h> 57#include <sys/socketvar.h> 58#include <sys/sockio.h> 59#include <sys/protosw.h> 60#include <sys/errno.h> 61#include <sys/time.h> 62#include <sys/kernel.h> 63#include <sys/syslog.h> 64 65#include <net/if.h> 66#include <net/route.h> 67#include <net/raw_cb.h> 68 69#include <netinet/in.h> 70#include <netinet/in_var.h> 71 72#include <netinet/ip6.h> 73#include <netinet6/ip6_var.h> 74#include <netinet6/ip6_mroute.h> 75#include <netinet6/pim6.h> 76#include <netinet6/pim6_var.h> 77 78#include <net/net_osdep.h> 79 80static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry"); 81 82#define M_HASCL(m) ((m)->m_flags & M_EXT) 83 84static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 85static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 86 87static int set_pim6 __P((int *)); 88static int socket_send __P((struct socket *, struct mbuf *, 89 struct sockaddr_in6 *)); 90static int register_send __P((struct ip6_hdr *, struct mif6 *, 91 struct mbuf *)); 92 93/* 94 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 95 * except for netstat or debugging purposes. 96 */ 97struct socket *ip6_mrouter = NULL; 98int ip6_mrouter_ver = 0; 99int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 100struct mrt6stat mrt6stat; 101 102#define NO_RTE_FOUND 0x1 103#define RTE_FOUND 0x2 104 105struct mf6c *mf6ctable[MF6CTBLSIZ]; 106u_char nexpire[MF6CTBLSIZ]; 107static struct mif6 mif6table[MAXMIFS]; 108#ifdef MRT6DEBUG 109u_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 118static 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 124extern 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 */ 136struct ifnet multicast_register_if; 137 138#define ENCAP_HOPS 64 139 140/* 141 * Private variables. 142 */ 143static mifi_t nummifs = 0; 144static mifi_t reg_mif_num = (mifi_t)-1; 145 146static struct pim6stat pim6stat; 147static int pim6; 148 149/* 150 * Hash function for a source, group entry 151 */ 152#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 153 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 154 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 155 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 156 157/* 158 * Find a route for a given origin IPv6 address and Multicast group address. 159 * Quality of service parameter to be added in the future!!! 160 */ 161 162#define MF6CFIND(o, g, rt) do { \ 163 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 164 rt = NULL; \ 165 mrt6stat.mrt6s_mfc_lookups++; \ 166 while (_rt) { \ 167 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 168 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 169 (_rt->mf6c_stall == NULL)) { \ 170 rt = _rt; \ 171 break; \ 172 } \ 173 _rt = _rt->mf6c_next; \ 174 } \ 175 if (rt == NULL) { \ 176 mrt6stat.mrt6s_mfc_misses++; \ 177 } \ 178} while (0) 179 180/* 181 * Macros to compute elapsed time efficiently 182 * Borrowed from Van Jacobson's scheduling code 183 */ 184#define TV_DELTA(a, b, delta) do { \ 185 int xxs; \ 186 \ 187 delta = (a).tv_usec - (b).tv_usec; \ 188 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 189 switch (xxs) { \ 190 case 2: \ 191 delta += 1000000; \ 192 /* fall through */ \ 193 case 1: \ 194 delta += 1000000; \ 195 break; \ 196 default: \ 197 delta += (1000000 * xxs); \ 198 } \ 199 } \ 200} while (0) 201 202#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 203 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 204 205#ifdef UPCALL_TIMING 206#define UPCALL_MAX 50 207u_long upcall_data[UPCALL_MAX + 1]; 208static void collate(); 209#endif /* UPCALL_TIMING */ 210 211static int get_sg_cnt __P((struct sioc_sg_req6 *)); 212static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 213static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 214static int add_m6if __P((struct mif6ctl *)); 215static int del_m6if __P((mifi_t *)); 216static int add_m6fc __P((struct mf6cctl *)); 217static int del_m6fc __P((struct mf6cctl *)); 218 219static struct callout expire_upcalls_ch; 220 221/* 222 * Handle MRT setsockopt commands to modify the multicast routing tables. 223 */ 224int 225ip6_mrouter_set(so, sopt) 226 struct socket *so; 227 struct sockopt *sopt; 228{ 229 int error = 0; 230 struct mbuf *m; 231 232 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 233 return (EACCES); 234 235 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 236 return (error); 237 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 238 return (error); 239 240 switch (sopt->sopt_name) { 241 case MRT6_INIT: 242#ifdef MRT6_OINIT 243 case MRT6_OINIT: 244#endif 245 error = ip6_mrouter_init(so, m, sopt->sopt_name); 246 break; 247 case MRT6_DONE: 248 error = ip6_mrouter_done(); 249 break; 250 case MRT6_ADD_MIF: 251 error = add_m6if(mtod(m, struct mif6ctl *)); 252 break; 253 case MRT6_DEL_MIF: 254 error = del_m6if(mtod(m, mifi_t *)); 255 break; 256 case MRT6_ADD_MFC: 257 error = add_m6fc(mtod(m, struct mf6cctl *)); 258 break; 259 case MRT6_DEL_MFC: 260 error = del_m6fc(mtod(m, struct mf6cctl *)); 261 break; 262 case MRT6_PIM: 263 error = set_pim6(mtod(m, int *)); 264 break; 265 default: 266 error = EOPNOTSUPP; 267 break; 268 } 269 270 (void)m_freem(m); 271 return(error); 272} 273 274/* 275 * Handle MRT getsockopt commands 276 */ 277int 278ip6_mrouter_get(so, sopt) 279 struct socket *so; 280 struct sockopt *sopt; 281{ 282 int error = 0; 283 284 if (so != ip6_mrouter) return EACCES; 285 286 switch (sopt->sopt_name) { 287 case MRT6_PIM: 288 error = sooptcopyout(sopt, &pim6, sizeof(pim6)); 289 break; 290 } 291 return (error); 292} 293 294/* 295 * Handle ioctl commands to obtain information from the cache 296 */ 297int 298mrt6_ioctl(cmd, data) 299 int cmd; 300 caddr_t data; 301{ 302 int error = 0; 303 304 switch (cmd) { 305 case SIOCGETSGCNT_IN6: 306 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 307 break; /* for safety */ 308 case SIOCGETMIFCNT_IN6: 309 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 310 break; /* for safety */ 311 default: 312 return (EINVAL); 313 break; 314 } 315 return error; 316} 317 318/* 319 * returns the packet, byte, rpf-failure count for the source group provided 320 */ 321static int 322get_sg_cnt(req) 323 struct sioc_sg_req6 *req; 324{ 325 struct mf6c *rt; 326 int s; 327 328 s = splnet(); 329 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 330 splx(s); 331 if (rt != NULL) { 332 req->pktcnt = rt->mf6c_pkt_cnt; 333 req->bytecnt = rt->mf6c_byte_cnt; 334 req->wrong_if = rt->mf6c_wrong_if; 335 } else 336 return(ESRCH); 337#if 0 338 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 339#endif 340 341 return 0; 342} 343 344/* 345 * returns the input and output packet and byte counts on the mif provided 346 */ 347static int 348get_mif6_cnt(req) 349 struct sioc_mif_req6 *req; 350{ 351 mifi_t mifi = req->mifi; 352 353 if (mifi >= nummifs) 354 return EINVAL; 355 356 req->icount = mif6table[mifi].m6_pkt_in; 357 req->ocount = mif6table[mifi].m6_pkt_out; 358 req->ibytes = mif6table[mifi].m6_bytes_in; 359 req->obytes = mif6table[mifi].m6_bytes_out; 360 361 return 0; 362} 363 364static int 365set_pim6(i) 366 int *i; 367{ 368 if ((*i != 1) && (*i != 0)) 369 return EINVAL; 370 371 pim6 = *i; 372 373 return 0; 374} 375 376/* 377 * Enable multicast routing 378 */ 379static int 380ip6_mrouter_init(so, m, cmd) 381 struct socket *so; 382 struct mbuf *m; 383 int cmd; 384{ 385 int *v; 386 387#ifdef MRT6DEBUG 388 if (mrt6debug) 389 log(LOG_DEBUG, 390 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 391 so->so_type, so->so_proto->pr_protocol); 392#endif 393 394 if (so->so_type != SOCK_RAW || 395 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 396 return EOPNOTSUPP; 397 398 if (!m || (m->m_len != sizeof(int *))) 399 return ENOPROTOOPT; 400 401 v = mtod(m, int *); 402 if (*v != 1) 403 return ENOPROTOOPT; 404 405 if (ip6_mrouter != NULL) return EADDRINUSE; 406 407 ip6_mrouter = so; 408 ip6_mrouter_ver = cmd; 409 410 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 411 bzero((caddr_t)nexpire, sizeof(nexpire)); 412 413 pim6 = 0;/* used for stubbing out/in pim stuff */ 414 415 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 416 expire_upcalls, NULL); 417 418#ifdef MRT6DEBUG 419 if (mrt6debug) 420 log(LOG_DEBUG, "ip6_mrouter_init\n"); 421#endif 422 423 return 0; 424} 425 426/* 427 * Disable multicast routing 428 */ 429int 430ip6_mrouter_done() 431{ 432 mifi_t mifi; 433 int i; 434 struct ifnet *ifp; 435 struct in6_ifreq ifr; 436 struct mf6c *rt; 437 struct rtdetq *rte; 438 int s; 439 440 s = splnet(); 441 442 /* 443 * For each phyint in use, disable promiscuous reception of all IPv6 444 * multicasts. 445 */ 446#ifdef INET 447#ifdef MROUTING 448 /* 449 * If there is still IPv4 multicast routing daemon, 450 * we remain interfaces to receive all muliticasted packets. 451 * XXX: there may be an interface in which the IPv4 multicast 452 * daemon is not interested... 453 */ 454 if (!ip_mrouter) 455#endif 456#endif 457 { 458 for (mifi = 0; mifi < nummifs; mifi++) { 459 if (mif6table[mifi].m6_ifp && 460 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 461 ifr.ifr_addr.sin6_family = AF_INET6; 462 ifr.ifr_addr.sin6_addr= in6addr_any; 463 ifp = mif6table[mifi].m6_ifp; 464 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 465 (caddr_t)&ifr); 466 } 467 } 468 } 469#ifdef notyet 470 bzero((caddr_t)qtable, sizeof(qtable)); 471 bzero((caddr_t)tbftable, sizeof(tbftable)); 472#endif 473 bzero((caddr_t)mif6table, sizeof(mif6table)); 474 nummifs = 0; 475 476 pim6 = 0; /* used to stub out/in pim specific code */ 477 478 callout_stop(&expire_upcalls_ch); 479 480 /* 481 * Free all multicast forwarding cache entries. 482 */ 483 for (i = 0; i < MF6CTBLSIZ; i++) { 484 rt = mf6ctable[i]; 485 while (rt) { 486 struct mf6c *frt; 487 488 for (rte = rt->mf6c_stall; rte != NULL; ) { 489 struct rtdetq *n = rte->next; 490 491 m_free(rte->m); 492 free(rte, M_MRTABLE); 493 rte = n; 494 } 495 frt = rt; 496 rt = rt->mf6c_next; 497 free(frt, M_MRTABLE); 498 } 499 } 500 501 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 502 503 /* 504 * Reset de-encapsulation cache 505 */ 506 reg_mif_num = -1; 507 508 ip6_mrouter = NULL; 509 ip6_mrouter_ver = 0; 510 511 splx(s); 512 513#ifdef MRT6DEBUG 514 if (mrt6debug) 515 log(LOG_DEBUG, "ip6_mrouter_done\n"); 516#endif 517 518 return 0; 519} 520 521static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 522 523/* 524 * Add a mif to the mif table 525 */ 526static int 527add_m6if(mifcp) 528 struct mif6ctl *mifcp; 529{ 530 struct mif6 *mifp; 531 struct ifnet *ifp; 532 int error, s; 533#ifdef notyet 534 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 535#endif 536 537 if (mifcp->mif6c_mifi >= MAXMIFS) 538 return EINVAL; 539 mifp = mif6table + mifcp->mif6c_mifi; 540 if (mifp->m6_ifp) 541 return EADDRINUSE; /* XXX: is it appropriate? */ 542 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 543 return ENXIO; 544 ifp = ifnet_byindex(mifcp->mif6c_pifi); 545 546 if (mifcp->mif6c_flags & MIFF_REGISTER) { 547 if (reg_mif_num == (mifi_t)-1) { 548 multicast_register_if.if_name = "register_mif"; 549 multicast_register_if.if_flags |= IFF_LOOPBACK; 550 multicast_register_if.if_index = mifcp->mif6c_mifi; 551 reg_mif_num = mifcp->mif6c_mifi; 552 } 553 554 ifp = &multicast_register_if; 555 556 } /* if REGISTER */ 557 else { 558 /* Make sure the interface supports multicast */ 559 if ((ifp->if_flags & IFF_MULTICAST) == 0) 560 return EOPNOTSUPP; 561 562 s = splnet(); 563 error = if_allmulti(ifp, 1); 564 splx(s); 565 if (error) 566 return error; 567 } 568 569 s = splnet(); 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 */ 601static int 602del_m6if(mifip) 603 mifi_t *mifip; 604{ 605 struct mif6 *mifp = mif6table + *mifip; 606 mifi_t mifi; 607 struct ifnet *ifp; 608 int s; 609 610 if (*mifip >= nummifs) 611 return EINVAL; 612 if (mifp->m6_ifp == NULL) 613 return EINVAL; 614 615 s = splnet(); 616 617 if (!(mifp->m6_flags & MIFF_REGISTER)) { 618 /* 619 * XXX: what if there is yet IPv4 multicast daemon 620 * using the interface? 621 */ 622 ifp = mifp->m6_ifp; 623 624 if_allmulti(ifp, 0); 625 } 626 627#ifdef notyet 628 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 629 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 630#endif 631 bzero((caddr_t)mifp, sizeof (*mifp)); 632 633 /* Adjust nummifs down */ 634 for (mifi = nummifs; mifi > 0; mifi--) 635 if (mif6table[mifi - 1].m6_ifp) 636 break; 637 nummifs = mifi; 638 639 splx(s); 640 641#ifdef MRT6DEBUG 642 if (mrt6debug) 643 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 644#endif 645 646 return 0; 647} 648 649/* 650 * Add an mfc entry 651 */ 652static int 653add_m6fc(mfccp) 654 struct mf6cctl *mfccp; 655{ 656 struct mf6c *rt; 657 u_long hash; 658 struct rtdetq *rte; 659 u_short nstl; 660 int s; 661 662 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 663 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 664 665 /* If an entry already exists, just update the fields */ 666 if (rt) { 667#ifdef MRT6DEBUG 668 if (mrt6debug & DEBUG_MFC) 669 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 670 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 671 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 672 mfccp->mf6cc_parent); 673#endif 674 675 s = splnet(); 676 rt->mf6c_parent = mfccp->mf6cc_parent; 677 rt->mf6c_ifset = mfccp->mf6cc_ifset; 678 splx(s); 679 return 0; 680 } 681 682 /* 683 * Find the entry for which the upcall was made and update 684 */ 685 s = splnet(); 686 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 687 mfccp->mf6cc_mcastgrp.sin6_addr); 688 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 689 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 690 &mfccp->mf6cc_origin.sin6_addr) && 691 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 692 &mfccp->mf6cc_mcastgrp.sin6_addr) && 693 (rt->mf6c_stall != NULL)) { 694 695 if (nstl++) 696 log(LOG_ERR, 697 "add_m6fc: %s o %s g %s p %x dbx %p\n", 698 "multiple kernel entries", 699 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 700 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 701 mfccp->mf6cc_parent, rt->mf6c_stall); 702 703#ifdef MRT6DEBUG 704 if (mrt6debug & DEBUG_MFC) 705 log(LOG_DEBUG, 706 "add_m6fc o %s g %s p %x dbg %x\n", 707 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 708 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 709 mfccp->mf6cc_parent, rt->mf6c_stall); 710#endif 711 712 rt->mf6c_origin = mfccp->mf6cc_origin; 713 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 714 rt->mf6c_parent = mfccp->mf6cc_parent; 715 rt->mf6c_ifset = mfccp->mf6cc_ifset; 716 /* initialize pkt counters per src-grp */ 717 rt->mf6c_pkt_cnt = 0; 718 rt->mf6c_byte_cnt = 0; 719 rt->mf6c_wrong_if = 0; 720 721 rt->mf6c_expire = 0; /* Don't clean this guy up */ 722 nexpire[hash]--; 723 724 /* free packets Qed at the end of this entry */ 725 for (rte = rt->mf6c_stall; rte != NULL; ) { 726 struct rtdetq *n = rte->next; 727 ip6_mdq(rte->m, rte->ifp, rt); 728 m_freem(rte->m); 729#ifdef UPCALL_TIMING 730 collate(&(rte->t)); 731#endif /* UPCALL_TIMING */ 732 free(rte, M_MRTABLE); 733 rte = n; 734 } 735 rt->mf6c_stall = NULL; 736 } 737 } 738 739 /* 740 * It is possible that an entry is being inserted without an upcall 741 */ 742 if (nstl == 0) { 743#ifdef MRT6DEBUG 744 if (mrt6debug & DEBUG_MFC) 745 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 746 hash, 747 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 748 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 749 mfccp->mf6cc_parent); 750#endif 751 752 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 753 754 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 755 &mfccp->mf6cc_origin.sin6_addr)&& 756 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 757 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 758 759 rt->mf6c_origin = mfccp->mf6cc_origin; 760 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 761 rt->mf6c_parent = mfccp->mf6cc_parent; 762 rt->mf6c_ifset = mfccp->mf6cc_ifset; 763 /* initialize pkt counters per src-grp */ 764 rt->mf6c_pkt_cnt = 0; 765 rt->mf6c_byte_cnt = 0; 766 rt->mf6c_wrong_if = 0; 767 768 if (rt->mf6c_expire) 769 nexpire[hash]--; 770 rt->mf6c_expire = 0; 771 } 772 } 773 if (rt == NULL) { 774 /* no upcall, so make a new entry */ 775 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 776 M_NOWAIT); 777 if (rt == NULL) { 778 splx(s); 779 return ENOBUFS; 780 } 781 782 /* insert new entry at head of hash chain */ 783 rt->mf6c_origin = mfccp->mf6cc_origin; 784 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 785 rt->mf6c_parent = mfccp->mf6cc_parent; 786 rt->mf6c_ifset = mfccp->mf6cc_ifset; 787 /* initialize pkt counters per src-grp */ 788 rt->mf6c_pkt_cnt = 0; 789 rt->mf6c_byte_cnt = 0; 790 rt->mf6c_wrong_if = 0; 791 rt->mf6c_expire = 0; 792 rt->mf6c_stall = NULL; 793 794 /* link into table */ 795 rt->mf6c_next = mf6ctable[hash]; 796 mf6ctable[hash] = rt; 797 } 798 } 799 splx(s); 800 return 0; 801} 802 803#ifdef UPCALL_TIMING 804/* 805 * collect delay statistics on the upcalls 806 */ 807static void 808collate(t) 809 struct timeval *t; 810{ 811 u_long d; 812 struct timeval tp; 813 u_long delta; 814 815 GET_TIME(tp); 816 817 if (TV_LT(*t, tp)) 818 { 819 TV_DELTA(tp, *t, delta); 820 821 d = delta >> 10; 822 if (d > UPCALL_MAX) 823 d = UPCALL_MAX; 824 825 ++upcall_data[d]; 826 } 827} 828#endif /* UPCALL_TIMING */ 829 830/* 831 * Delete an mfc entry 832 */ 833static int 834del_m6fc(mfccp) 835 struct mf6cctl *mfccp; 836{ 837 struct sockaddr_in6 origin; 838 struct sockaddr_in6 mcastgrp; 839 struct mf6c *rt; 840 struct mf6c **nptr; 841 u_long hash; 842 int s; 843 844 origin = mfccp->mf6cc_origin; 845 mcastgrp = mfccp->mf6cc_mcastgrp; 846 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 847 848#ifdef MRT6DEBUG 849 if (mrt6debug & DEBUG_MFC) 850 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 851 ip6_sprintf(&origin.sin6_addr), 852 ip6_sprintf(&mcastgrp.sin6_addr)); 853#endif 854 855 s = splnet(); 856 857 nptr = &mf6ctable[hash]; 858 while ((rt = *nptr) != NULL) { 859 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 860 &rt->mf6c_origin.sin6_addr) && 861 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 862 &rt->mf6c_mcastgrp.sin6_addr) && 863 rt->mf6c_stall == NULL) 864 break; 865 866 nptr = &rt->mf6c_next; 867 } 868 if (rt == NULL) { 869 splx(s); 870 return EADDRNOTAVAIL; 871 } 872 873 *nptr = rt->mf6c_next; 874 free(rt, M_MRTABLE); 875 876 splx(s); 877 878 return 0; 879} 880 881static int 882socket_send(s, mm, src) 883 struct socket *s; 884 struct mbuf *mm; 885 struct sockaddr_in6 *src; 886{ 887 if (s) { 888 if (sbappendaddr(&s->so_rcv, 889 (struct sockaddr *)src, 890 mm, (struct mbuf *)0) != 0) { 891 sorwakeup(s); 892 return 0; 893 } 894 } 895 m_freem(mm); 896 return -1; 897} 898 899/* 900 * IPv6 multicast forwarding function. This function assumes that the packet 901 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 902 * pointed to by "ifp", and the packet is to be relayed to other networks 903 * that have members of the packet's destination IPv6 multicast group. 904 * 905 * The packet is returned unscathed to the caller, unless it is 906 * erroneous, in which case a non-zero return value tells the caller to 907 * discard it. 908 */ 909 910int 911ip6_mforward(ip6, ifp, m) 912 struct ip6_hdr *ip6; 913 struct ifnet *ifp; 914 struct mbuf *m; 915{ 916 struct mf6c *rt; 917 struct mif6 *mifp; 918 struct mbuf *mm; 919 int s; 920 mifi_t mifi; 921 922#ifdef MRT6DEBUG 923 if (mrt6debug & DEBUG_FORWARD) 924 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 925 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 926 ifp->if_index); 927#endif 928 929 /* 930 * Don't forward a packet with Hop limit of zero or one, 931 * or a packet destined to a local-only group. 932 */ 933 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 934 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 935 return 0; 936 ip6->ip6_hlim--; 937 938 /* 939 * Source address check: do not forward packets with unspecified 940 * source. It was discussed in July 2000, on ipngwg mailing list. 941 * This is rather more serious than unicast cases, because some 942 * MLD packets can be sent with the unspecified source address 943 * (although such packets must normally set 1 to the hop limit field). 944 */ 945 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 946 ip6stat.ip6s_cantforward++; 947 if (ip6_log_time + ip6_log_interval < time_second) { 948 ip6_log_time = time_second; 949 log(LOG_DEBUG, 950 "cannot forward " 951 "from %s to %s nxt %d received on %s\n", 952 ip6_sprintf(&ip6->ip6_src), 953 ip6_sprintf(&ip6->ip6_dst), 954 ip6->ip6_nxt, 955 if_name(m->m_pkthdr.rcvif)); 956 } 957 return 0; 958 } 959 960 /* 961 * Determine forwarding mifs from the forwarding cache table 962 */ 963 s = splnet(); 964 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 965 966 /* Entry exists, so forward if necessary */ 967 if (rt) { 968 splx(s); 969 return (ip6_mdq(m, ifp, rt)); 970 } else { 971 /* 972 * If we don't have a route for packet's origin, 973 * Make a copy of the packet & 974 * send message to routing daemon 975 */ 976 977 struct mbuf *mb0; 978 struct rtdetq *rte; 979 u_long hash; 980/* int i, npkts;*/ 981#ifdef UPCALL_TIMING 982 struct timeval tp; 983 984 GET_TIME(tp); 985#endif /* UPCALL_TIMING */ 986 987 mrt6stat.mrt6s_no_route++; 988#ifdef MRT6DEBUG 989 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 990 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 991 ip6_sprintf(&ip6->ip6_src), 992 ip6_sprintf(&ip6->ip6_dst)); 993#endif 994 995 /* 996 * Allocate mbufs early so that we don't do extra work if we 997 * are just going to fail anyway. 998 */ 999 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1000 M_NOWAIT); 1001 if (rte == NULL) { 1002 splx(s); 1003 return ENOBUFS; 1004 } 1005 mb0 = m_copy(m, 0, M_COPYALL); 1006 /* 1007 * Pullup packet header if needed before storing it, 1008 * as other references may modify it in the meantime. 1009 */ 1010 if (mb0 && 1011 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1012 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1013 if (mb0 == NULL) { 1014 free(rte, M_MRTABLE); 1015 splx(s); 1016 return ENOBUFS; 1017 } 1018 1019 /* is there an upcall waiting for this packet? */ 1020 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1021 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1022 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1023 &rt->mf6c_origin.sin6_addr) && 1024 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1025 &rt->mf6c_mcastgrp.sin6_addr) && 1026 (rt->mf6c_stall != NULL)) 1027 break; 1028 } 1029 1030 if (rt == NULL) { 1031 struct mrt6msg *im; 1032#ifdef MRT6_OINIT 1033 struct omrt6msg *oim; 1034#endif 1035 1036 /* no upcall, so make a new entry */ 1037 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1038 M_NOWAIT); 1039 if (rt == NULL) { 1040 free(rte, M_MRTABLE); 1041 m_freem(mb0); 1042 splx(s); 1043 return ENOBUFS; 1044 } 1045 /* 1046 * Make a copy of the header to send to the user 1047 * level process 1048 */ 1049 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1050 1051 if (mm == NULL) { 1052 free(rte, M_MRTABLE); 1053 m_freem(mb0); 1054 free(rt, M_MRTABLE); 1055 splx(s); 1056 return ENOBUFS; 1057 } 1058 1059 /* 1060 * Send message to routing daemon 1061 */ 1062 sin6.sin6_addr = ip6->ip6_src; 1063 1064 im = NULL; 1065#ifdef MRT6_OINIT 1066 oim = NULL; 1067#endif 1068 switch (ip6_mrouter_ver) { 1069#ifdef MRT6_OINIT 1070 case MRT6_OINIT: 1071 oim = mtod(mm, struct omrt6msg *); 1072 oim->im6_msgtype = MRT6MSG_NOCACHE; 1073 oim->im6_mbz = 0; 1074 break; 1075#endif 1076 case MRT6_INIT: 1077 im = mtod(mm, struct mrt6msg *); 1078 im->im6_msgtype = MRT6MSG_NOCACHE; 1079 im->im6_mbz = 0; 1080 break; 1081 default: 1082 free(rte, M_MRTABLE); 1083 m_freem(mb0); 1084 free(rt, M_MRTABLE); 1085 splx(s); 1086 return EINVAL; 1087 } 1088 1089#ifdef MRT6DEBUG 1090 if (mrt6debug & DEBUG_FORWARD) 1091 log(LOG_DEBUG, 1092 "getting the iif info in the kernel\n"); 1093#endif 1094 1095 for (mifp = mif6table, mifi = 0; 1096 mifi < nummifs && mifp->m6_ifp != ifp; 1097 mifp++, mifi++) 1098 ; 1099 1100 switch (ip6_mrouter_ver) { 1101#ifdef MRT6_OINIT 1102 case MRT6_OINIT: 1103 oim->im6_mif = mifi; 1104 break; 1105#endif 1106 case MRT6_INIT: 1107 im->im6_mif = mifi; 1108 break; 1109 } 1110 1111 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1112 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1113 "socket queue full\n"); 1114 mrt6stat.mrt6s_upq_sockfull++; 1115 free(rte, M_MRTABLE); 1116 m_freem(mb0); 1117 free(rt, M_MRTABLE); 1118 splx(s); 1119 return ENOBUFS; 1120 } 1121 1122 mrt6stat.mrt6s_upcalls++; 1123 1124 /* insert new entry at head of hash chain */ 1125 bzero(rt, sizeof(*rt)); 1126 rt->mf6c_origin.sin6_family = AF_INET6; 1127 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1128 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1129 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1130 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1131 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1132 rt->mf6c_expire = UPCALL_EXPIRE; 1133 nexpire[hash]++; 1134 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1135 1136 /* link into table */ 1137 rt->mf6c_next = mf6ctable[hash]; 1138 mf6ctable[hash] = rt; 1139 /* Add this entry to the end of the queue */ 1140 rt->mf6c_stall = rte; 1141 } else { 1142 /* determine if q has overflowed */ 1143 struct rtdetq **p; 1144 int npkts = 0; 1145 1146 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1147 if (++npkts > MAX_UPQ6) { 1148 mrt6stat.mrt6s_upq_ovflw++; 1149 free(rte, M_MRTABLE); 1150 m_freem(mb0); 1151 splx(s); 1152 return 0; 1153 } 1154 1155 /* Add this entry to the end of the queue */ 1156 *p = rte; 1157 } 1158 1159 rte->next = NULL; 1160 rte->m = mb0; 1161 rte->ifp = ifp; 1162#ifdef UPCALL_TIMING 1163 rte->t = tp; 1164#endif /* UPCALL_TIMING */ 1165 1166 splx(s); 1167 1168 return 0; 1169 } 1170} 1171 1172/* 1173 * Clean up cache entries if upcalls are not serviced 1174 * Call from the Slow Timeout mechanism, every half second. 1175 */ 1176static void 1177expire_upcalls(unused) 1178 void *unused; 1179{ 1180 struct rtdetq *rte; 1181 struct mf6c *mfc, **nptr; 1182 int i; 1183 int s; 1184 1185 s = splnet(); 1186 for (i = 0; i < MF6CTBLSIZ; i++) { 1187 if (nexpire[i] == 0) 1188 continue; 1189 nptr = &mf6ctable[i]; 1190 while ((mfc = *nptr) != NULL) { 1191 rte = mfc->mf6c_stall; 1192 /* 1193 * Skip real cache entries 1194 * Make sure it wasn't marked to not expire (shouldn't happen) 1195 * If it expires now 1196 */ 1197 if (rte != NULL && 1198 mfc->mf6c_expire != 0 && 1199 --mfc->mf6c_expire == 0) { 1200#ifdef MRT6DEBUG 1201 if (mrt6debug & DEBUG_EXPIRE) 1202 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1203 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1204 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1205#endif 1206 /* 1207 * drop all the packets 1208 * free the mbuf with the pkt, if, timing info 1209 */ 1210 do { 1211 struct rtdetq *n = rte->next; 1212 m_freem(rte->m); 1213 free(rte, M_MRTABLE); 1214 rte = n; 1215 } while (rte != NULL); 1216 mrt6stat.mrt6s_cache_cleanups++; 1217 nexpire[i]--; 1218 1219 *nptr = mfc->mf6c_next; 1220 free(mfc, M_MRTABLE); 1221 } else { 1222 nptr = &mfc->mf6c_next; 1223 } 1224 } 1225 } 1226 splx(s); 1227 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1228 expire_upcalls, NULL); 1229} 1230 1231/* 1232 * Packet forwarding routine once entry in the cache is made 1233 */ 1234static int 1235ip6_mdq(m, ifp, rt) 1236 struct mbuf *m; 1237 struct ifnet *ifp; 1238 struct mf6c *rt; 1239{ 1240 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1241 mifi_t mifi, iif; 1242 struct mif6 *mifp; 1243 int plen = m->m_pkthdr.len; 1244 1245/* 1246 * Macro to send packet on mif. Since RSVP packets don't get counted on 1247 * input, they shouldn't get counted on output, so statistics keeping is 1248 * separate. 1249 */ 1250 1251#define MC6_SEND(ip6, mifp, m) do { \ 1252 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1253 register_send((ip6), (mifp), (m)); \ 1254 else \ 1255 phyint_send((ip6), (mifp), (m)); \ 1256} while (0) 1257 1258 /* 1259 * Don't forward if it didn't arrive from the parent mif 1260 * for its origin. 1261 */ 1262 mifi = rt->mf6c_parent; 1263 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1264 /* came in the wrong interface */ 1265#ifdef MRT6DEBUG 1266 if (mrt6debug & DEBUG_FORWARD) 1267 log(LOG_DEBUG, 1268 "wrong if: ifid %d mifi %d mififid %x\n", 1269 ifp->if_index, mifi, 1270 mif6table[mifi].m6_ifp->if_index); 1271#endif 1272 mrt6stat.mrt6s_wrong_if++; 1273 rt->mf6c_wrong_if++; 1274 /* 1275 * If we are doing PIM processing, and we are forwarding 1276 * packets on this interface, send a message to the 1277 * routing daemon. 1278 */ 1279 /* have to make sure this is a valid mif */ 1280 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1281 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1282 /* 1283 * Check the M_LOOP flag to avoid an 1284 * unnecessary PIM assert. 1285 * XXX: M_LOOP is an ad-hoc hack... 1286 */ 1287 static struct sockaddr_in6 sin6 = 1288 { sizeof(sin6), AF_INET6 }; 1289 1290 struct mbuf *mm; 1291 struct mrt6msg *im; 1292#ifdef MRT6_OINIT 1293 struct omrt6msg *oim; 1294#endif 1295 1296 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1297 if (mm && 1298 (M_HASCL(mm) || 1299 mm->m_len < sizeof(struct ip6_hdr))) 1300 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1301 if (mm == NULL) 1302 return ENOBUFS; 1303 1304#ifdef MRT6_OINIT 1305 oim = NULL; 1306#endif 1307 im = NULL; 1308 switch (ip6_mrouter_ver) { 1309#ifdef MRT6_OINIT 1310 case MRT6_OINIT: 1311 oim = mtod(mm, struct omrt6msg *); 1312 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1313 oim->im6_mbz = 0; 1314 break; 1315#endif 1316 case MRT6_INIT: 1317 im = mtod(mm, struct mrt6msg *); 1318 im->im6_msgtype = MRT6MSG_WRONGMIF; 1319 im->im6_mbz = 0; 1320 break; 1321 default: 1322 m_freem(mm); 1323 return EINVAL; 1324 } 1325 1326 for (mifp = mif6table, iif = 0; 1327 iif < nummifs && mifp && 1328 mifp->m6_ifp != ifp; 1329 mifp++, iif++) 1330 ; 1331 1332 switch (ip6_mrouter_ver) { 1333#ifdef MRT6_OINIT 1334 case MRT6_OINIT: 1335 oim->im6_mif = iif; 1336 sin6.sin6_addr = oim->im6_src; 1337 break; 1338#endif 1339 case MRT6_INIT: 1340 im->im6_mif = iif; 1341 sin6.sin6_addr = im->im6_src; 1342 break; 1343 } 1344 1345 mrt6stat.mrt6s_upcalls++; 1346 1347 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1348#ifdef MRT6DEBUG 1349 if (mrt6debug) 1350 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1351#endif 1352 ++mrt6stat.mrt6s_upq_sockfull; 1353 return ENOBUFS; 1354 } /* if socket Q full */ 1355 } /* if PIM */ 1356 return 0; 1357 } /* if wrong iif */ 1358 1359 /* If I sourced this packet, it counts as output, else it was input. */ 1360 if (m->m_pkthdr.rcvif == NULL) { 1361 /* XXX: is rcvif really NULL when output?? */ 1362 mif6table[mifi].m6_pkt_out++; 1363 mif6table[mifi].m6_bytes_out += plen; 1364 } else { 1365 mif6table[mifi].m6_pkt_in++; 1366 mif6table[mifi].m6_bytes_in += plen; 1367 } 1368 rt->mf6c_pkt_cnt++; 1369 rt->mf6c_byte_cnt += plen; 1370 1371 /* 1372 * For each mif, forward a copy of the packet if there are group 1373 * members downstream on the interface. 1374 */ 1375 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1376 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1377 /* 1378 * check if the outgoing packet is going to break 1379 * a scope boundary. 1380 * XXX For packets through PIM register tunnel 1381 * interface, we believe a routing daemon. 1382 */ 1383 if ((mif6table[rt->mf6c_parent].m6_flags & 1384 MIFF_REGISTER) == 0 && 1385 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1386 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1387 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1388 &ip6->ip6_dst) || 1389 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1390 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1391 &ip6->ip6_src))) { 1392 ip6stat.ip6s_badscope++; 1393 continue; 1394 } 1395 1396 mifp->m6_pkt_out++; 1397 mifp->m6_bytes_out += plen; 1398 MC6_SEND(ip6, mifp, m); 1399 } 1400 return 0; 1401} 1402 1403static void 1404phyint_send(ip6, mifp, m) 1405 struct ip6_hdr *ip6; 1406 struct mif6 *mifp; 1407 struct mbuf *m; 1408{ 1409 struct mbuf *mb_copy; 1410 struct ifnet *ifp = mifp->m6_ifp; 1411 int error = 0; 1412 int s = splnet(); /* needs to protect static "ro" below. */ 1413 static struct route_in6 ro; 1414 struct in6_multi *in6m; 1415 struct sockaddr_in6 *dst6; 1416 1417 /* 1418 * Make a new reference to the packet; make sure that 1419 * the IPv6 header is actually copied, not just referenced, 1420 * so that ip6_output() only scribbles on the copy. 1421 */ 1422 mb_copy = m_copy(m, 0, M_COPYALL); 1423 if (mb_copy && 1424 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1425 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1426 if (mb_copy == NULL) { 1427 splx(s); 1428 return; 1429 } 1430 /* set MCAST flag to the outgoing packet */ 1431 mb_copy->m_flags |= M_MCAST; 1432 1433 /* 1434 * If we sourced the packet, call ip6_output since we may devide 1435 * the packet into fragments when the packet is too big for the 1436 * outgoing interface. 1437 * Otherwise, we can simply send the packet to the interface 1438 * sending queue. 1439 */ 1440 if (m->m_pkthdr.rcvif == NULL) { 1441 struct ip6_moptions im6o; 1442 1443 im6o.im6o_multicast_ifp = ifp; 1444 /* XXX: ip6_output will override ip6->ip6_hlim */ 1445 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1446 im6o.im6o_multicast_loop = 1; 1447 error = ip6_output(mb_copy, NULL, &ro, 1448 IPV6_FORWARDING, &im6o, NULL); 1449 1450#ifdef MRT6DEBUG 1451 if (mrt6debug & DEBUG_XMIT) 1452 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1453 mifp - mif6table, error); 1454#endif 1455 splx(s); 1456 return; 1457 } 1458 1459 /* 1460 * If we belong to the destination multicast group 1461 * on the outgoing interface, loop back a copy. 1462 */ 1463 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1464 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1465 if (in6m != NULL) { 1466 dst6->sin6_len = sizeof(struct sockaddr_in6); 1467 dst6->sin6_family = AF_INET6; 1468 dst6->sin6_addr = ip6->ip6_dst; 1469 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1470 } 1471 /* 1472 * Put the packet into the sending queue of the outgoing interface 1473 * if it would fit in the MTU of the interface. 1474 */ 1475 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1476 dst6->sin6_len = sizeof(struct sockaddr_in6); 1477 dst6->sin6_family = AF_INET6; 1478 dst6->sin6_addr = ip6->ip6_dst; 1479 /* 1480 * We just call if_output instead of nd6_output here, since 1481 * we need no ND for a multicast forwarded packet...right? 1482 */ 1483 error = (*ifp->if_output)(ifp, mb_copy, 1484 (struct sockaddr *)&ro.ro_dst, NULL); 1485#ifdef MRT6DEBUG 1486 if (mrt6debug & DEBUG_XMIT) 1487 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1488 mifp - mif6table, error); 1489#endif 1490 } else { 1491#ifdef MULTICAST_PMTUD 1492 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1493#else 1494#ifdef MRT6DEBUG 1495 if (mrt6debug & DEBUG_XMIT) 1496 log(LOG_DEBUG, 1497 "phyint_send: packet too big on %s o %s g %s" 1498 " size %d(discarded)\n", 1499 if_name(ifp), 1500 ip6_sprintf(&ip6->ip6_src), 1501 ip6_sprintf(&ip6->ip6_dst), 1502 mb_copy->m_pkthdr.len); 1503#endif /* MRT6DEBUG */ 1504 m_freem(mb_copy); /* simply discard the packet */ 1505#endif 1506 } 1507 1508 splx(s); 1509} 1510 1511static int 1512register_send(ip6, mif, m) 1513 struct ip6_hdr *ip6; 1514 struct mif6 *mif; 1515 struct mbuf *m; 1516{ 1517 struct mbuf *mm; 1518 int i, len = m->m_pkthdr.len; 1519 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1520 struct mrt6msg *im6; 1521 1522#ifdef MRT6DEBUG 1523 if (mrt6debug) 1524 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1525 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1526#endif 1527 ++pim6stat.pim6s_snd_registers; 1528 1529 /* Make a copy of the packet to send to the user level process */ 1530 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1531 if (mm == NULL) 1532 return ENOBUFS; 1533 mm->m_pkthdr.rcvif = NULL; 1534 mm->m_data += max_linkhdr; 1535 mm->m_len = sizeof(struct ip6_hdr); 1536 1537 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1538 m_freem(mm); 1539 return ENOBUFS; 1540 } 1541 i = MHLEN - M_LEADINGSPACE(mm); 1542 if (i > len) 1543 i = len; 1544 mm = m_pullup(mm, i); 1545 if (mm == NULL){ 1546 m_freem(mm); 1547 return ENOBUFS; 1548 } 1549/* TODO: check it! */ 1550 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1551 1552 /* 1553 * Send message to routing daemon 1554 */ 1555 sin6.sin6_addr = ip6->ip6_src; 1556 1557 im6 = mtod(mm, struct mrt6msg *); 1558 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1559 im6->im6_mbz = 0; 1560 1561 im6->im6_mif = mif - mif6table; 1562 1563 /* iif info is not given for reg. encap.n */ 1564 mrt6stat.mrt6s_upcalls++; 1565 1566 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1567#ifdef MRT6DEBUG 1568 if (mrt6debug) 1569 log(LOG_WARNING, 1570 "register_send: ip_mrouter socket queue full\n"); 1571#endif 1572 ++mrt6stat.mrt6s_upq_sockfull; 1573 return ENOBUFS; 1574 } 1575 return 0; 1576} 1577 1578/* 1579 * PIM sparse mode hook 1580 * Receives the pim control messages, and passes them up to the listening 1581 * socket, using rip6_input. 1582 * The only message processed is the REGISTER pim message; the pim header 1583 * is stripped off, and the inner packet is passed to register_mforward. 1584 */ 1585int 1586pim6_input(mp, offp, proto) 1587 struct mbuf **mp; 1588 int *offp, proto; 1589{ 1590 struct pim *pim; /* pointer to a pim struct */ 1591 struct ip6_hdr *ip6; 1592 int pimlen; 1593 struct mbuf *m = *mp; 1594 int minlen; 1595 int off = *offp; 1596 1597 ++pim6stat.pim6s_rcv_total; 1598 1599 ip6 = mtod(m, struct ip6_hdr *); 1600 pimlen = m->m_pkthdr.len - *offp; 1601 1602 /* 1603 * Validate lengths 1604 */ 1605 if (pimlen < PIM_MINLEN) { 1606 ++pim6stat.pim6s_rcv_tooshort; 1607#ifdef MRT6DEBUG 1608 if (mrt6debug & DEBUG_PIM) 1609 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1610#endif 1611 m_freem(m); 1612 return(IPPROTO_DONE); 1613 } 1614 1615 /* 1616 * if the packet is at least as big as a REGISTER, go ahead 1617 * and grab the PIM REGISTER header size, to avoid another 1618 * possible m_pullup() later. 1619 * 1620 * PIM_MINLEN == pimhdr + u_int32 == 8 1621 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1622 */ 1623 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1624 1625 /* 1626 * Make sure that the IP6 and PIM headers in contiguous memory, and 1627 * possibly the PIM REGISTER header 1628 */ 1629#ifndef PULLDOWN_TEST 1630 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1631 /* adjust pointer */ 1632 ip6 = mtod(m, struct ip6_hdr *); 1633 1634 /* adjust mbuf to point to the PIM header */ 1635 pim = (struct pim *)((caddr_t)ip6 + off); 1636#else 1637 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1638 if (pim == NULL) { 1639 pim6stat.pim6s_rcv_tooshort++; 1640 return IPPROTO_DONE; 1641 } 1642#endif 1643 1644#define PIM6_CHECKSUM 1645#ifdef PIM6_CHECKSUM 1646 { 1647 int cksumlen; 1648 1649 /* 1650 * Validate checksum. 1651 * If PIM REGISTER, exclude the data packet 1652 */ 1653 if (pim->pim_type == PIM_REGISTER) 1654 cksumlen = PIM_MINLEN; 1655 else 1656 cksumlen = pimlen; 1657 1658 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1659 ++pim6stat.pim6s_rcv_badsum; 1660#ifdef MRT6DEBUG 1661 if (mrt6debug & DEBUG_PIM) 1662 log(LOG_DEBUG, 1663 "pim6_input: invalid checksum\n"); 1664#endif 1665 m_freem(m); 1666 return(IPPROTO_DONE); 1667 } 1668 } 1669#endif /* PIM_CHECKSUM */ 1670 1671 /* PIM version check */ 1672 if (pim->pim_ver != PIM_VERSION) { 1673 ++pim6stat.pim6s_rcv_badversion; 1674#ifdef MRT6DEBUG 1675 log(LOG_ERR, 1676 "pim6_input: incorrect version %d, expecting %d\n", 1677 pim->pim_ver, PIM_VERSION); 1678#endif 1679 m_freem(m); 1680 return(IPPROTO_DONE); 1681 } 1682 1683 if (pim->pim_type == PIM_REGISTER) { 1684 /* 1685 * since this is a REGISTER, we'll make a copy of the register 1686 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1687 * routing daemon. 1688 */ 1689 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1690 1691 struct mbuf *mcp; 1692 struct ip6_hdr *eip6; 1693 u_int32_t *reghdr; 1694 int rc; 1695 1696 ++pim6stat.pim6s_rcv_registers; 1697 1698 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1699#ifdef MRT6DEBUG 1700 if (mrt6debug & DEBUG_PIM) 1701 log(LOG_DEBUG, 1702 "pim6_input: register mif not set: %d\n", 1703 reg_mif_num); 1704#endif 1705 m_freem(m); 1706 return(IPPROTO_DONE); 1707 } 1708 1709 reghdr = (u_int32_t *)(pim + 1); 1710 1711 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1712 goto pim6_input_to_daemon; 1713 1714 /* 1715 * Validate length 1716 */ 1717 if (pimlen < PIM6_REG_MINLEN) { 1718 ++pim6stat.pim6s_rcv_tooshort; 1719 ++pim6stat.pim6s_rcv_badregisters; 1720#ifdef MRT6DEBUG 1721 log(LOG_ERR, 1722 "pim6_input: register packet size too " 1723 "small %d from %s\n", 1724 pimlen, ip6_sprintf(&ip6->ip6_src)); 1725#endif 1726 m_freem(m); 1727 return(IPPROTO_DONE); 1728 } 1729 1730 eip6 = (struct ip6_hdr *) (reghdr + 1); 1731#ifdef MRT6DEBUG 1732 if (mrt6debug & DEBUG_PIM) 1733 log(LOG_DEBUG, 1734 "pim6_input[register], eip6: %s -> %s, " 1735 "eip6 plen %d\n", 1736 ip6_sprintf(&eip6->ip6_src), 1737 ip6_sprintf(&eip6->ip6_dst), 1738 ntohs(eip6->ip6_plen)); 1739#endif 1740 1741 /* verify the version number of the inner packet */ 1742 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1743 ++pim6stat.pim6s_rcv_badregisters; 1744#ifdef MRT6DEBUG 1745 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1746 "of the inner packet\n", 1747 (eip6->ip6_vfc & IPV6_VERSION)); 1748#endif 1749 m_freem(m); 1750 return(IPPROTO_NONE); 1751 } 1752 1753 /* verify the inner packet is destined to a mcast group */ 1754 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1755 ++pim6stat.pim6s_rcv_badregisters; 1756#ifdef MRT6DEBUG 1757 if (mrt6debug & DEBUG_PIM) 1758 log(LOG_DEBUG, 1759 "pim6_input: inner packet of register " 1760 "is not multicast %s\n", 1761 ip6_sprintf(&eip6->ip6_dst)); 1762#endif 1763 m_freem(m); 1764 return(IPPROTO_DONE); 1765 } 1766 1767 /* 1768 * make a copy of the whole header to pass to the daemon later. 1769 */ 1770 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1771 if (mcp == NULL) { 1772#ifdef MRT6DEBUG 1773 log(LOG_ERR, 1774 "pim6_input: pim register: " 1775 "could not copy register head\n"); 1776#endif 1777 m_freem(m); 1778 return(IPPROTO_DONE); 1779 } 1780 1781 /* 1782 * forward the inner ip6 packet; point m_data at the inner ip6. 1783 */ 1784 m_adj(m, off + PIM_MINLEN); 1785#ifdef MRT6DEBUG 1786 if (mrt6debug & DEBUG_PIM) { 1787 log(LOG_DEBUG, 1788 "pim6_input: forwarding decapsulated register: " 1789 "src %s, dst %s, mif %d\n", 1790 ip6_sprintf(&eip6->ip6_src), 1791 ip6_sprintf(&eip6->ip6_dst), 1792 reg_mif_num); 1793 } 1794#endif 1795 1796 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1797 dst.sin6_family, NULL); 1798 1799 /* prepare the register head to send to the mrouting daemon */ 1800 m = mcp; 1801 } 1802 1803 /* 1804 * Pass the PIM message up to the daemon; if it is a register message 1805 * pass the 'head' only up to the daemon. This includes the 1806 * encapsulator ip6 header, pim header, register header and the 1807 * encapsulated ip6 header. 1808 */ 1809 pim6_input_to_daemon: 1810 rip6_input(&m, offp, proto); 1811 return(IPPROTO_DONE); 1812} 1813