ip6_mroute.c revision 1.23
1 /* $NetBSD: ip6_mroute.c,v 1.23 2001/10/16 06:24:44 itojun Exp $ */ 2 /* $KAME: ip6_mroute.c,v 1.49 2001/07/25 09:21:18 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ 34 35 /* 36 * IP multicast forwarding procedures 37 * 38 * Written by David Waitzman, BBN Labs, August 1988. 39 * Modified by Steve Deering, Stanford, February 1989. 40 * Modified by Mark J. Steiglitz, Stanford, May, 1991 41 * Modified by Van Jacobson, LBL, January 1993 42 * Modified by Ajit Thyagarajan, PARC, August 1993 43 * Modified by Bill Fenenr, PARC, April 1994 44 * 45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 46 */ 47 48 #include "opt_inet.h" 49 50 #ifndef _KERNEL 51 # ifdef KERNEL 52 # define _KERNEL 53 # endif 54 #endif 55 56 #include <sys/param.h> 57 #include <sys/systm.h> 58 #include <sys/callout.h> 59 #include <sys/mbuf.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/sockio.h> 63 #include <sys/protosw.h> 64 #include <sys/errno.h> 65 #include <sys/time.h> 66 #include <sys/kernel.h> 67 #include <sys/ioctl.h> 68 #include <sys/syslog.h> 69 70 #include <net/if.h> 71 #include <net/route.h> 72 #include <net/raw_cb.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_var.h> 76 77 #include <netinet/ip6.h> 78 #include <netinet6/ip6_var.h> 79 #include <netinet6/ip6_mroute.h> 80 #include <netinet6/pim6.h> 81 #include <netinet6/pim6_var.h> 82 83 #include <net/net_osdep.h> 84 85 #define M_HASCL(m) ((m)->m_flags & M_EXT) 86 87 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 88 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 89 90 static int set_pim6 __P((int *)); 91 static int get_pim6 __P((struct mbuf *)); 92 static int socket_send __P((struct socket *, struct mbuf *, 93 struct sockaddr_in6 *)); 94 static int register_send __P((struct ip6_hdr *, struct mif6 *, 95 struct mbuf *)); 96 97 /* 98 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 99 * except for netstat or debugging purposes. 100 */ 101 struct socket *ip6_mrouter = NULL; 102 int ip6_mrouter_ver = 0; 103 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 104 struct mrt6stat mrt6stat; 105 106 #define NO_RTE_FOUND 0x1 107 #define RTE_FOUND 0x2 108 109 struct mf6c *mf6ctable[MF6CTBLSIZ]; 110 u_char nexpire[MF6CTBLSIZ]; 111 static struct mif6 mif6table[MAXMIFS]; 112 #ifdef MRT6DEBUG 113 u_int mrt6debug = 0; /* debug level */ 114 #define DEBUG_MFC 0x02 115 #define DEBUG_FORWARD 0x04 116 #define DEBUG_EXPIRE 0x08 117 #define DEBUG_XMIT 0x10 118 #define DEBUG_REG 0x20 119 #define DEBUG_PIM 0x40 120 #endif 121 122 static void expire_upcalls __P((void *)); 123 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 124 #define UPCALL_EXPIRE 6 /* number of timeouts */ 125 126 #ifdef INET 127 #ifdef MROUTING 128 extern struct socket *ip_mrouter; 129 #endif 130 #endif 131 132 /* 133 * 'Interfaces' associated with decapsulator (so we can tell 134 * packets that went through it from ones that get reflected 135 * by a broken gateway). These interfaces are never linked into 136 * the system ifnet list & no routes point to them. I.e., packets 137 * can't be sent this way. They only exist as a placeholder for 138 * multicast source verification. 139 */ 140 struct ifnet multicast_register_if; 141 142 #define ENCAP_HOPS 64 143 144 /* 145 * Private variables. 146 */ 147 static mifi_t nummifs = 0; 148 static mifi_t reg_mif_num = (mifi_t)-1; 149 150 static struct pim6stat pim6stat; 151 152 /* 153 * one-back cache used by ipip_input to locate a tunnel's mif 154 * given a datagram's src ip address. 155 */ 156 static int pim6; 157 158 /* 159 * Hash function for a source, group entry 160 */ 161 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 162 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 163 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 164 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 165 166 /* 167 * Find a route for a given origin IPv6 address and Multicast group address. 168 * Quality of service parameter to be added in the future!!! 169 */ 170 171 #define MF6CFIND(o, g, rt) do { \ 172 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 173 rt = NULL; \ 174 mrt6stat.mrt6s_mfc_lookups++; \ 175 while (_rt) { \ 176 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 177 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 178 (_rt->mf6c_stall == NULL)) { \ 179 rt = _rt; \ 180 break; \ 181 } \ 182 _rt = _rt->mf6c_next; \ 183 } \ 184 if (rt == NULL) { \ 185 mrt6stat.mrt6s_mfc_misses++; \ 186 } \ 187 } while (0) 188 189 /* 190 * Macros to compute elapsed time efficiently 191 * Borrowed from Van Jacobson's scheduling code 192 */ 193 #define TV_DELTA(a, b, delta) do { \ 194 int xxs; \ 195 \ 196 delta = (a).tv_usec - (b).tv_usec; \ 197 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 198 switch (xxs) { \ 199 case 2: \ 200 delta += 1000000; \ 201 /* fall through */ \ 202 case 1: \ 203 delta += 1000000; \ 204 break; \ 205 default: \ 206 delta += (1000000 * xxs); \ 207 } \ 208 } \ 209 } while (0) 210 211 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 212 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 213 214 #ifdef UPCALL_TIMING 215 #define UPCALL_MAX 50 216 u_long upcall_data[UPCALL_MAX + 1]; 217 static void collate(); 218 #endif /* UPCALL_TIMING */ 219 220 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 221 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 222 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 223 static int add_m6if __P((struct mif6ctl *)); 224 static int del_m6if __P((mifi_t *)); 225 static int add_m6fc __P((struct mf6cctl *)); 226 static int del_m6fc __P((struct mf6cctl *)); 227 228 static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER; 229 230 /* 231 * Handle MRT setsockopt commands to modify the multicast routing tables. 232 */ 233 int 234 ip6_mrouter_set(cmd, so, m) 235 int cmd; 236 struct socket *so; 237 struct mbuf *m; 238 { 239 if (cmd != MRT6_INIT && so != ip6_mrouter) 240 return EACCES; 241 242 switch (cmd) { 243 case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd); 244 case MRT6_INIT: return ip6_mrouter_init(so, m, cmd); 245 case MRT6_DONE: return ip6_mrouter_done(); 246 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 247 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 248 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 249 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 250 case MRT6_PIM: return set_pim6(mtod(m, int *)); 251 default: return EOPNOTSUPP; 252 } 253 } 254 255 /* 256 * Handle MRT getsockopt commands 257 */ 258 int 259 ip6_mrouter_get(cmd, so, m) 260 int cmd; 261 struct socket *so; 262 struct mbuf **m; 263 { 264 struct mbuf *mb; 265 266 if (so != ip6_mrouter) return EACCES; 267 268 *m = mb = m_get(M_WAIT, MT_SOOPTS); 269 270 switch (cmd) { 271 case MRT6_PIM: 272 return get_pim6(mb); 273 default: 274 m_free(mb); 275 return EOPNOTSUPP; 276 } 277 } 278 279 /* 280 * Handle ioctl commands to obtain information from the cache 281 */ 282 int 283 mrt6_ioctl(cmd, data) 284 int cmd; 285 caddr_t data; 286 { 287 int error = 0; 288 289 switch (cmd) { 290 case SIOCGETSGCNT_IN6: 291 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 292 break; /* for safety */ 293 case SIOCGETMIFCNT_IN6: 294 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 295 break; /* for safety */ 296 default: 297 return (EINVAL); 298 break; 299 } 300 return error; 301 } 302 303 /* 304 * returns the packet, byte, rpf-failure count for the source group provided 305 */ 306 static int 307 get_sg_cnt(req) 308 struct sioc_sg_req6 *req; 309 { 310 struct mf6c *rt; 311 int s; 312 313 s = splsoftnet(); 314 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 315 splx(s); 316 if (rt != NULL) { 317 req->pktcnt = rt->mf6c_pkt_cnt; 318 req->bytecnt = rt->mf6c_byte_cnt; 319 req->wrong_if = rt->mf6c_wrong_if; 320 } else 321 return(ESRCH); 322 #if 0 323 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 324 #endif 325 326 return 0; 327 } 328 329 /* 330 * returns the input and output packet and byte counts on the mif provided 331 */ 332 static int 333 get_mif6_cnt(req) 334 struct sioc_mif_req6 *req; 335 { 336 mifi_t mifi = req->mifi; 337 338 if (mifi >= nummifs) 339 return EINVAL; 340 341 req->icount = mif6table[mifi].m6_pkt_in; 342 req->ocount = mif6table[mifi].m6_pkt_out; 343 req->ibytes = mif6table[mifi].m6_bytes_in; 344 req->obytes = mif6table[mifi].m6_bytes_out; 345 346 return 0; 347 } 348 349 /* 350 * Get PIM processiong global 351 */ 352 static int 353 get_pim6(m) 354 struct mbuf *m; 355 { 356 int *i; 357 358 i = mtod(m, int *); 359 360 *i = pim6; 361 362 return 0; 363 } 364 365 static int 366 set_pim6(i) 367 int *i; 368 { 369 if ((*i != 1) && (*i != 0)) 370 return EINVAL; 371 372 pim6 = *i; 373 374 return 0; 375 } 376 377 /* 378 * Enable multicast routing 379 */ 380 static int 381 ip6_mrouter_init(so, m, cmd) 382 struct socket *so; 383 struct mbuf *m; 384 int cmd; 385 { 386 int *v; 387 388 #ifdef MRT6DEBUG 389 if (mrt6debug) 390 log(LOG_DEBUG, 391 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 392 so->so_type, so->so_proto->pr_protocol); 393 #endif 394 395 if (so->so_type != SOCK_RAW || 396 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 397 return EOPNOTSUPP; 398 399 if (!m || (m->m_len != sizeof(int *))) 400 return ENOPROTOOPT; 401 402 v = mtod(m, int *); 403 if (*v != 1) 404 return ENOPROTOOPT; 405 406 if (ip6_mrouter != NULL) return EADDRINUSE; 407 408 ip6_mrouter = so; 409 ip6_mrouter_ver = cmd; 410 411 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 412 bzero((caddr_t)nexpire, sizeof(nexpire)); 413 414 pim6 = 0;/* used for stubbing out/in pim stuff */ 415 416 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 417 expire_upcalls, NULL); 418 419 #ifdef MRT6DEBUG 420 if (mrt6debug) 421 log(LOG_DEBUG, "ip6_mrouter_init\n"); 422 #endif 423 424 return 0; 425 } 426 427 /* 428 * Disable multicast routing 429 */ 430 int 431 ip6_mrouter_done() 432 { 433 mifi_t mifi; 434 int i; 435 struct ifnet *ifp; 436 struct in6_ifreq ifr; 437 struct mf6c *rt; 438 struct rtdetq *rte; 439 int s; 440 441 s = splsoftnet(); 442 443 /* 444 * For each phyint in use, disable promiscuous reception of all IPv6 445 * multicasts. 446 */ 447 #ifdef INET 448 #ifdef MROUTING 449 /* 450 * If there is still IPv4 multicast routing daemon, 451 * we remain interfaces to receive all muliticasted packets. 452 * XXX: there may be an interface in which the IPv4 multicast 453 * daemon is not interested... 454 */ 455 if (!ip_mrouter) 456 #endif 457 #endif 458 { 459 for (mifi = 0; mifi < nummifs; mifi++) { 460 if (mif6table[mifi].m6_ifp && 461 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 462 ifr.ifr_addr.sin6_family = AF_INET6; 463 ifr.ifr_addr.sin6_addr= in6addr_any; 464 ifp = mif6table[mifi].m6_ifp; 465 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 466 (caddr_t)&ifr); 467 } 468 } 469 } 470 #ifdef notyet 471 bzero((caddr_t)qtable, sizeof(qtable)); 472 bzero((caddr_t)tbftable, sizeof(tbftable)); 473 #endif 474 bzero((caddr_t)mif6table, sizeof(mif6table)); 475 nummifs = 0; 476 477 pim6 = 0; /* used to stub out/in pim specific code */ 478 479 callout_stop(&expire_upcalls_ch); 480 481 /* 482 * Free all multicast forwarding cache entries. 483 */ 484 for (i = 0; i < MF6CTBLSIZ; i++) { 485 rt = mf6ctable[i]; 486 while (rt) { 487 struct mf6c *frt; 488 489 for (rte = rt->mf6c_stall; rte != NULL; ) { 490 struct rtdetq *n = rte->next; 491 492 m_free(rte->m); 493 free(rte, M_MRTABLE); 494 rte = n; 495 } 496 frt = rt; 497 rt = rt->mf6c_next; 498 free(frt, M_MRTABLE); 499 } 500 } 501 502 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 503 504 /* 505 * Reset de-encapsulation cache 506 */ 507 reg_mif_num = -1; 508 509 ip6_mrouter = NULL; 510 ip6_mrouter_ver = 0; 511 512 splx(s); 513 514 #ifdef MRT6DEBUG 515 if (mrt6debug) 516 log(LOG_DEBUG, "ip6_mrouter_done\n"); 517 #endif 518 519 return 0; 520 } 521 522 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 523 524 /* 525 * Add a mif to the mif table 526 */ 527 static int 528 add_m6if(mifcp) 529 struct mif6ctl *mifcp; 530 { 531 struct mif6 *mifp; 532 struct ifnet *ifp; 533 struct in6_ifreq ifr; 534 int error, s; 535 #ifdef notyet 536 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 537 #endif 538 539 if (mifcp->mif6c_mifi >= MAXMIFS) 540 return EINVAL; 541 mifp = mif6table + mifcp->mif6c_mifi; 542 if (mifp->m6_ifp) 543 return EADDRINUSE; /* XXX: is it appropriate? */ 544 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 545 return ENXIO; 546 /* 547 * XXX: some OSes can remove ifp and clear ifindex2ifnet[id] 548 * even for id between 0 and if_index. 549 */ 550 if ((ifp = ifindex2ifnet[mifcp->mif6c_pifi]) == NULL) 551 return ENXIO; 552 553 if (mifcp->mif6c_flags & MIFF_REGISTER) { 554 if (reg_mif_num == (mifi_t)-1) { 555 strcpy(multicast_register_if.if_xname, 556 "register_mif"); /* XXX */ 557 multicast_register_if.if_flags |= IFF_LOOPBACK; 558 multicast_register_if.if_index = mifcp->mif6c_mifi; 559 reg_mif_num = mifcp->mif6c_mifi; 560 } 561 562 ifp = &multicast_register_if; 563 564 } /* if REGISTER */ 565 else { 566 /* Make sure the interface supports multicast */ 567 if ((ifp->if_flags & IFF_MULTICAST) == 0) 568 return EOPNOTSUPP; 569 570 s = splsoftnet(); 571 /* 572 * Enable promiscuous reception of all IPv6 multicasts 573 * from the interface. 574 */ 575 ifr.ifr_addr.sin6_family = AF_INET6; 576 ifr.ifr_addr.sin6_addr = in6addr_any; 577 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 578 splx(s); 579 if (error) 580 return error; 581 } 582 583 s = splsoftnet(); 584 mifp->m6_flags = mifcp->mif6c_flags; 585 mifp->m6_ifp = ifp; 586 #ifdef notyet 587 /* scaling up here allows division by 1024 in critical code */ 588 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 589 #endif 590 /* initialize per mif pkt counters */ 591 mifp->m6_pkt_in = 0; 592 mifp->m6_pkt_out = 0; 593 mifp->m6_bytes_in = 0; 594 mifp->m6_bytes_out = 0; 595 splx(s); 596 597 /* Adjust nummifs up if the mifi is higher than nummifs */ 598 if (nummifs <= mifcp->mif6c_mifi) 599 nummifs = mifcp->mif6c_mifi + 1; 600 601 #ifdef MRT6DEBUG 602 if (mrt6debug) 603 log(LOG_DEBUG, 604 "add_mif #%d, phyint %s%d\n", 605 mifcp->mif6c_mifi, 606 ifp->if_name, ifp->if_unit); 607 #endif 608 609 return 0; 610 } 611 612 /* 613 * Delete a mif from the mif table 614 */ 615 static int 616 del_m6if(mifip) 617 mifi_t *mifip; 618 { 619 struct mif6 *mifp = mif6table + *mifip; 620 mifi_t mifi; 621 struct ifnet *ifp; 622 struct in6_ifreq ifr; 623 int s; 624 625 if (*mifip >= nummifs) 626 return EINVAL; 627 if (mifp->m6_ifp == NULL) 628 return EINVAL; 629 630 s = splsoftnet(); 631 632 if (!(mifp->m6_flags & MIFF_REGISTER)) { 633 /* 634 * XXX: what if there is yet IPv4 multicast daemon 635 * using the interface? 636 */ 637 ifp = mifp->m6_ifp; 638 639 ifr.ifr_addr.sin6_family = AF_INET6; 640 ifr.ifr_addr.sin6_addr = in6addr_any; 641 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 642 } 643 644 #ifdef notyet 645 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 646 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 647 #endif 648 bzero((caddr_t)mifp, sizeof (*mifp)); 649 650 /* Adjust nummifs down */ 651 for (mifi = nummifs; mifi > 0; mifi--) 652 if (mif6table[mifi - 1].m6_ifp) 653 break; 654 nummifs = mifi; 655 656 splx(s); 657 658 #ifdef MRT6DEBUG 659 if (mrt6debug) 660 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 661 #endif 662 663 return 0; 664 } 665 666 /* 667 * Add an mfc entry 668 */ 669 static int 670 add_m6fc(mfccp) 671 struct mf6cctl *mfccp; 672 { 673 struct mf6c *rt; 674 u_long hash; 675 struct rtdetq *rte; 676 u_short nstl; 677 int s; 678 679 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 680 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 681 682 /* If an entry already exists, just update the fields */ 683 if (rt) { 684 #ifdef MRT6DEBUG 685 if (mrt6debug & DEBUG_MFC) 686 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 687 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 688 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 689 mfccp->mf6cc_parent); 690 #endif 691 692 s = splsoftnet(); 693 rt->mf6c_parent = mfccp->mf6cc_parent; 694 rt->mf6c_ifset = mfccp->mf6cc_ifset; 695 splx(s); 696 return 0; 697 } 698 699 /* 700 * Find the entry for which the upcall was made and update 701 */ 702 s = splsoftnet(); 703 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 704 mfccp->mf6cc_mcastgrp.sin6_addr); 705 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 706 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 707 &mfccp->mf6cc_origin.sin6_addr) && 708 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 709 &mfccp->mf6cc_mcastgrp.sin6_addr) && 710 (rt->mf6c_stall != NULL)) { 711 712 if (nstl++) 713 log(LOG_ERR, 714 "add_m6fc: %s o %s g %s p %x dbx %p\n", 715 "multiple kernel entries", 716 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 717 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 718 mfccp->mf6cc_parent, rt->mf6c_stall); 719 720 #ifdef MRT6DEBUG 721 if (mrt6debug & DEBUG_MFC) 722 log(LOG_DEBUG, 723 "add_m6fc o %s g %s p %x dbg %x\n", 724 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 725 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 726 mfccp->mf6cc_parent, rt->mf6c_stall); 727 #endif 728 729 rt->mf6c_origin = mfccp->mf6cc_origin; 730 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 731 rt->mf6c_parent = mfccp->mf6cc_parent; 732 rt->mf6c_ifset = mfccp->mf6cc_ifset; 733 /* initialize pkt counters per src-grp */ 734 rt->mf6c_pkt_cnt = 0; 735 rt->mf6c_byte_cnt = 0; 736 rt->mf6c_wrong_if = 0; 737 738 rt->mf6c_expire = 0; /* Don't clean this guy up */ 739 nexpire[hash]--; 740 741 /* free packets Qed at the end of this entry */ 742 for (rte = rt->mf6c_stall; rte != NULL; ) { 743 struct rtdetq *n = rte->next; 744 ip6_mdq(rte->m, rte->ifp, rt); 745 m_freem(rte->m); 746 #ifdef UPCALL_TIMING 747 collate(&(rte->t)); 748 #endif /* UPCALL_TIMING */ 749 free(rte, M_MRTABLE); 750 rte = n; 751 } 752 rt->mf6c_stall = NULL; 753 } 754 } 755 756 /* 757 * It is possible that an entry is being inserted without an upcall 758 */ 759 if (nstl == 0) { 760 #ifdef MRT6DEBUG 761 if (mrt6debug & DEBUG_MFC) 762 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 763 hash, 764 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 765 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 766 mfccp->mf6cc_parent); 767 #endif 768 769 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 770 771 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 772 &mfccp->mf6cc_origin.sin6_addr)&& 773 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 774 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 775 776 rt->mf6c_origin = mfccp->mf6cc_origin; 777 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 778 rt->mf6c_parent = mfccp->mf6cc_parent; 779 rt->mf6c_ifset = mfccp->mf6cc_ifset; 780 /* initialize pkt counters per src-grp */ 781 rt->mf6c_pkt_cnt = 0; 782 rt->mf6c_byte_cnt = 0; 783 rt->mf6c_wrong_if = 0; 784 785 if (rt->mf6c_expire) 786 nexpire[hash]--; 787 rt->mf6c_expire = 0; 788 } 789 } 790 if (rt == NULL) { 791 /* no upcall, so make a new entry */ 792 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 793 M_NOWAIT); 794 if (rt == NULL) { 795 splx(s); 796 return ENOBUFS; 797 } 798 799 /* insert new entry at head of hash chain */ 800 rt->mf6c_origin = mfccp->mf6cc_origin; 801 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 802 rt->mf6c_parent = mfccp->mf6cc_parent; 803 rt->mf6c_ifset = mfccp->mf6cc_ifset; 804 /* initialize pkt counters per src-grp */ 805 rt->mf6c_pkt_cnt = 0; 806 rt->mf6c_byte_cnt = 0; 807 rt->mf6c_wrong_if = 0; 808 rt->mf6c_expire = 0; 809 rt->mf6c_stall = NULL; 810 811 /* link into table */ 812 rt->mf6c_next = mf6ctable[hash]; 813 mf6ctable[hash] = rt; 814 } 815 } 816 splx(s); 817 return 0; 818 } 819 820 #ifdef UPCALL_TIMING 821 /* 822 * collect delay statistics on the upcalls 823 */ 824 static void 825 collate(t) 826 struct timeval *t; 827 { 828 u_long d; 829 struct timeval tp; 830 u_long delta; 831 832 GET_TIME(tp); 833 834 if (TV_LT(*t, tp)) 835 { 836 TV_DELTA(tp, *t, delta); 837 838 d = delta >> 10; 839 if (d > UPCALL_MAX) 840 d = UPCALL_MAX; 841 842 ++upcall_data[d]; 843 } 844 } 845 #endif /* UPCALL_TIMING */ 846 847 /* 848 * Delete an mfc entry 849 */ 850 static int 851 del_m6fc(mfccp) 852 struct mf6cctl *mfccp; 853 { 854 struct sockaddr_in6 origin; 855 struct sockaddr_in6 mcastgrp; 856 struct mf6c *rt; 857 struct mf6c **nptr; 858 u_long hash; 859 int s; 860 861 origin = mfccp->mf6cc_origin; 862 mcastgrp = mfccp->mf6cc_mcastgrp; 863 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 864 865 #ifdef MRT6DEBUG 866 if (mrt6debug & DEBUG_MFC) 867 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 868 ip6_sprintf(&origin.sin6_addr), 869 ip6_sprintf(&mcastgrp.sin6_addr)); 870 #endif 871 872 s = splsoftnet(); 873 874 nptr = &mf6ctable[hash]; 875 while ((rt = *nptr) != NULL) { 876 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 877 &rt->mf6c_origin.sin6_addr) && 878 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 879 &rt->mf6c_mcastgrp.sin6_addr) && 880 rt->mf6c_stall == NULL) 881 break; 882 883 nptr = &rt->mf6c_next; 884 } 885 if (rt == NULL) { 886 splx(s); 887 return EADDRNOTAVAIL; 888 } 889 890 *nptr = rt->mf6c_next; 891 free(rt, M_MRTABLE); 892 893 splx(s); 894 895 return 0; 896 } 897 898 static int 899 socket_send(s, mm, src) 900 struct socket *s; 901 struct mbuf *mm; 902 struct sockaddr_in6 *src; 903 { 904 if (s) { 905 if (sbappendaddr(&s->so_rcv, 906 (struct sockaddr *)src, 907 mm, (struct mbuf *)0) != 0) { 908 sorwakeup(s); 909 return 0; 910 } 911 } 912 m_freem(mm); 913 return -1; 914 } 915 916 /* 917 * IPv6 multicast forwarding function. This function assumes that the packet 918 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 919 * pointed to by "ifp", and the packet is to be relayed to other networks 920 * that have members of the packet's destination IPv6 multicast group. 921 * 922 * The packet is returned unscathed to the caller, unless it is 923 * erroneous, in which case a non-zero return value tells the caller to 924 * discard it. 925 */ 926 927 int 928 ip6_mforward(ip6, ifp, m) 929 struct ip6_hdr *ip6; 930 struct ifnet *ifp; 931 struct mbuf *m; 932 { 933 struct mf6c *rt; 934 struct mif6 *mifp; 935 struct mbuf *mm; 936 int s; 937 mifi_t mifi; 938 long time_second = time.tv_sec; 939 940 #ifdef MRT6DEBUG 941 if (mrt6debug & DEBUG_FORWARD) 942 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 943 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 944 ifp->if_index); 945 #endif 946 947 /* 948 * Don't forward a packet with Hop limit of zero or one, 949 * or a packet destined to a local-only group. 950 */ 951 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 952 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 953 return 0; 954 ip6->ip6_hlim--; 955 956 /* 957 * Source address check: do not forward packets with unspecified 958 * source. It was discussed in July 2000, on ipngwg mailing list. 959 * This is rather more serious than unicast cases, because some 960 * MLD packets can be sent with the unspecified source address 961 * (although such packets must normally set 1 to the hop limit field). 962 */ 963 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 964 ip6stat.ip6s_cantforward++; 965 if (ip6_log_time + ip6_log_interval < time_second) { 966 ip6_log_time = time_second; 967 log(LOG_DEBUG, 968 "cannot forward " 969 "from %s to %s nxt %d received on %s\n", 970 ip6_sprintf(&ip6->ip6_src), 971 ip6_sprintf(&ip6->ip6_dst), 972 ip6->ip6_nxt, 973 if_name(m->m_pkthdr.rcvif)); 974 } 975 return 0; 976 } 977 978 /* 979 * Determine forwarding mifs from the forwarding cache table 980 */ 981 s = splsoftnet(); 982 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 983 984 /* Entry exists, so forward if necessary */ 985 if (rt) { 986 splx(s); 987 return (ip6_mdq(m, ifp, rt)); 988 } else { 989 /* 990 * If we don't have a route for packet's origin, 991 * Make a copy of the packet & 992 * send message to routing daemon 993 */ 994 995 struct mbuf *mb0; 996 struct rtdetq *rte; 997 u_long hash; 998 /* int i, npkts;*/ 999 #ifdef UPCALL_TIMING 1000 struct timeval tp; 1001 1002 GET_TIME(tp); 1003 #endif /* UPCALL_TIMING */ 1004 1005 mrt6stat.mrt6s_no_route++; 1006 #ifdef MRT6DEBUG 1007 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1008 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1009 ip6_sprintf(&ip6->ip6_src), 1010 ip6_sprintf(&ip6->ip6_dst)); 1011 #endif 1012 1013 /* 1014 * Allocate mbufs early so that we don't do extra work if we 1015 * are just going to fail anyway. 1016 */ 1017 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1018 M_NOWAIT); 1019 if (rte == NULL) { 1020 splx(s); 1021 return ENOBUFS; 1022 } 1023 mb0 = m_copy(m, 0, M_COPYALL); 1024 /* 1025 * Pullup packet header if needed before storing it, 1026 * as other references may modify it in the meantime. 1027 */ 1028 if (mb0 && 1029 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1030 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1031 if (mb0 == NULL) { 1032 free(rte, M_MRTABLE); 1033 splx(s); 1034 return ENOBUFS; 1035 } 1036 1037 /* is there an upcall waiting for this packet? */ 1038 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1039 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1040 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1041 &rt->mf6c_origin.sin6_addr) && 1042 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1043 &rt->mf6c_mcastgrp.sin6_addr) && 1044 (rt->mf6c_stall != NULL)) 1045 break; 1046 } 1047 1048 if (rt == NULL) { 1049 struct mrt6msg *im; 1050 struct omrt6msg *oim; 1051 1052 /* no upcall, so make a new entry */ 1053 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1054 M_NOWAIT); 1055 if (rt == NULL) { 1056 free(rte, M_MRTABLE); 1057 m_freem(mb0); 1058 splx(s); 1059 return ENOBUFS; 1060 } 1061 /* 1062 * Make a copy of the header to send to the user 1063 * level process 1064 */ 1065 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1066 1067 if (mm == NULL) { 1068 free(rte, M_MRTABLE); 1069 m_freem(mb0); 1070 free(rt, M_MRTABLE); 1071 splx(s); 1072 return ENOBUFS; 1073 } 1074 1075 /* 1076 * Send message to routing daemon 1077 */ 1078 sin6.sin6_addr = ip6->ip6_src; 1079 1080 im = NULL; 1081 oim = NULL; 1082 switch (ip6_mrouter_ver) { 1083 case MRT6_OINIT: 1084 oim = mtod(mm, struct omrt6msg *); 1085 oim->im6_msgtype = MRT6MSG_NOCACHE; 1086 oim->im6_mbz = 0; 1087 break; 1088 case MRT6_INIT: 1089 im = mtod(mm, struct mrt6msg *); 1090 im->im6_msgtype = MRT6MSG_NOCACHE; 1091 im->im6_mbz = 0; 1092 break; 1093 default: 1094 free(rte, M_MRTABLE); 1095 m_freem(mb0); 1096 free(rt, M_MRTABLE); 1097 splx(s); 1098 return EINVAL; 1099 } 1100 1101 #ifdef MRT6DEBUG 1102 if (mrt6debug & DEBUG_FORWARD) 1103 log(LOG_DEBUG, 1104 "getting the iif info in the kernel\n"); 1105 #endif 1106 1107 for (mifp = mif6table, mifi = 0; 1108 mifi < nummifs && mifp->m6_ifp != ifp; 1109 mifp++, mifi++) 1110 ; 1111 1112 switch (ip6_mrouter_ver) { 1113 case MRT6_OINIT: 1114 oim->im6_mif = mifi; 1115 break; 1116 case MRT6_INIT: 1117 im->im6_mif = mifi; 1118 break; 1119 } 1120 1121 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1122 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1123 "socket queue full\n"); 1124 mrt6stat.mrt6s_upq_sockfull++; 1125 free(rte, M_MRTABLE); 1126 m_freem(mb0); 1127 free(rt, M_MRTABLE); 1128 splx(s); 1129 return ENOBUFS; 1130 } 1131 1132 mrt6stat.mrt6s_upcalls++; 1133 1134 /* insert new entry at head of hash chain */ 1135 bzero(rt, sizeof(*rt)); 1136 rt->mf6c_origin.sin6_family = AF_INET6; 1137 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1138 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1139 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1140 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1141 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1142 rt->mf6c_expire = UPCALL_EXPIRE; 1143 nexpire[hash]++; 1144 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1145 1146 /* link into table */ 1147 rt->mf6c_next = mf6ctable[hash]; 1148 mf6ctable[hash] = rt; 1149 /* Add this entry to the end of the queue */ 1150 rt->mf6c_stall = rte; 1151 } else { 1152 /* determine if q has overflowed */ 1153 struct rtdetq **p; 1154 int npkts = 0; 1155 1156 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1157 if (++npkts > MAX_UPQ6) { 1158 mrt6stat.mrt6s_upq_ovflw++; 1159 free(rte, M_MRTABLE); 1160 m_freem(mb0); 1161 splx(s); 1162 return 0; 1163 } 1164 1165 /* Add this entry to the end of the queue */ 1166 *p = rte; 1167 } 1168 1169 rte->next = NULL; 1170 rte->m = mb0; 1171 rte->ifp = ifp; 1172 #ifdef UPCALL_TIMING 1173 rte->t = tp; 1174 #endif /* UPCALL_TIMING */ 1175 1176 splx(s); 1177 1178 return 0; 1179 } 1180 } 1181 1182 /* 1183 * Clean up cache entries if upcalls are not serviced 1184 * Call from the Slow Timeout mechanism, every half second. 1185 */ 1186 static void 1187 expire_upcalls(unused) 1188 void *unused; 1189 { 1190 struct rtdetq *rte; 1191 struct mf6c *mfc, **nptr; 1192 int i; 1193 int s; 1194 1195 s = splsoftnet(); 1196 for (i = 0; i < MF6CTBLSIZ; i++) { 1197 if (nexpire[i] == 0) 1198 continue; 1199 nptr = &mf6ctable[i]; 1200 while ((mfc = *nptr) != NULL) { 1201 rte = mfc->mf6c_stall; 1202 /* 1203 * Skip real cache entries 1204 * Make sure it wasn't marked to not expire (shouldn't happen) 1205 * If it expires now 1206 */ 1207 if (rte != NULL && 1208 mfc->mf6c_expire != 0 && 1209 --mfc->mf6c_expire == 0) { 1210 #ifdef MRT6DEBUG 1211 if (mrt6debug & DEBUG_EXPIRE) 1212 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1213 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1214 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1215 #endif 1216 /* 1217 * drop all the packets 1218 * free the mbuf with the pkt, if, timing info 1219 */ 1220 do { 1221 struct rtdetq *n = rte->next; 1222 m_freem(rte->m); 1223 free(rte, M_MRTABLE); 1224 rte = n; 1225 } while (rte != NULL); 1226 mrt6stat.mrt6s_cache_cleanups++; 1227 nexpire[i]--; 1228 1229 *nptr = mfc->mf6c_next; 1230 free(mfc, M_MRTABLE); 1231 } else { 1232 nptr = &mfc->mf6c_next; 1233 } 1234 } 1235 } 1236 splx(s); 1237 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1238 expire_upcalls, NULL); 1239 } 1240 1241 /* 1242 * Packet forwarding routine once entry in the cache is made 1243 */ 1244 static int 1245 ip6_mdq(m, ifp, rt) 1246 struct mbuf *m; 1247 struct ifnet *ifp; 1248 struct mf6c *rt; 1249 { 1250 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1251 mifi_t mifi, iif; 1252 struct mif6 *mifp; 1253 int plen = m->m_pkthdr.len; 1254 1255 /* 1256 * Macro to send packet on mif. Since RSVP packets don't get counted on 1257 * input, they shouldn't get counted on output, so statistics keeping is 1258 * separate. 1259 */ 1260 1261 #define MC6_SEND(ip6, mifp, m) do { \ 1262 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1263 register_send((ip6), (mifp), (m)); \ 1264 else \ 1265 phyint_send((ip6), (mifp), (m)); \ 1266 } while (0) 1267 1268 /* 1269 * Don't forward if it didn't arrive from the parent mif 1270 * for its origin. 1271 */ 1272 mifi = rt->mf6c_parent; 1273 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1274 /* came in the wrong interface */ 1275 #ifdef MRT6DEBUG 1276 if (mrt6debug & DEBUG_FORWARD) 1277 log(LOG_DEBUG, 1278 "wrong if: ifid %d mifi %d mififid %x\n", 1279 ifp->if_index, mifi, 1280 mif6table[mifi].m6_ifp->if_index); 1281 #endif 1282 mrt6stat.mrt6s_wrong_if++; 1283 rt->mf6c_wrong_if++; 1284 /* 1285 * If we are doing PIM processing, and we are forwarding 1286 * packets on this interface, send a message to the 1287 * routing daemon. 1288 */ 1289 /* have to make sure this is a valid mif */ 1290 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1291 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1292 /* 1293 * Check the M_LOOP flag to avoid an 1294 * unnecessary PIM assert. 1295 * XXX: M_LOOP is an ad-hoc hack... 1296 */ 1297 static struct sockaddr_in6 sin6 = 1298 { sizeof(sin6), AF_INET6 }; 1299 1300 struct mbuf *mm; 1301 struct mrt6msg *im; 1302 struct omrt6msg *oim; 1303 1304 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1305 if (mm && 1306 (M_HASCL(mm) || 1307 mm->m_len < sizeof(struct ip6_hdr))) 1308 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1309 if (mm == NULL) 1310 return ENOBUFS; 1311 1312 oim = NULL; 1313 im = NULL; 1314 switch (ip6_mrouter_ver) { 1315 case MRT6_OINIT: 1316 oim = mtod(mm, struct omrt6msg *); 1317 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1318 oim->im6_mbz = 0; 1319 break; 1320 case MRT6_INIT: 1321 im = mtod(mm, struct mrt6msg *); 1322 im->im6_msgtype = MRT6MSG_WRONGMIF; 1323 im->im6_mbz = 0; 1324 break; 1325 default: 1326 m_freem(mm); 1327 return EINVAL; 1328 } 1329 1330 for (mifp = mif6table, iif = 0; 1331 iif < nummifs && mifp && 1332 mifp->m6_ifp != ifp; 1333 mifp++, iif++) 1334 ; 1335 1336 switch (ip6_mrouter_ver) { 1337 case MRT6_OINIT: 1338 oim->im6_mif = iif; 1339 sin6.sin6_addr = oim->im6_src; 1340 break; 1341 case MRT6_INIT: 1342 im->im6_mif = iif; 1343 sin6.sin6_addr = im->im6_src; 1344 break; 1345 } 1346 1347 mrt6stat.mrt6s_upcalls++; 1348 1349 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1350 #ifdef MRT6DEBUG 1351 if (mrt6debug) 1352 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1353 #endif 1354 ++mrt6stat.mrt6s_upq_sockfull; 1355 return ENOBUFS; 1356 } /* if socket Q full */ 1357 } /* if PIM */ 1358 return 0; 1359 } /* if wrong iif */ 1360 1361 /* If I sourced this packet, it counts as output, else it was input. */ 1362 if (m->m_pkthdr.rcvif == NULL) { 1363 /* XXX: is rcvif really NULL when output?? */ 1364 mif6table[mifi].m6_pkt_out++; 1365 mif6table[mifi].m6_bytes_out += plen; 1366 } else { 1367 mif6table[mifi].m6_pkt_in++; 1368 mif6table[mifi].m6_bytes_in += plen; 1369 } 1370 rt->mf6c_pkt_cnt++; 1371 rt->mf6c_byte_cnt += plen; 1372 1373 /* 1374 * For each mif, forward a copy of the packet if there are group 1375 * members downstream on the interface. 1376 */ 1377 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1378 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1379 #ifdef notyet 1380 /* 1381 * check if the outgoing packet is going to break 1382 * a scope boundary. 1383 * XXX For packets through PIM register tunnel 1384 * interface, we believe a routing daemon. 1385 */ 1386 if ((mif6table[rt->mf6c_parent].m6_flags & 1387 MIFF_REGISTER) == 0 && 1388 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1389 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1390 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1391 &ip6->ip6_dst) || 1392 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1393 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1394 &ip6->ip6_src))) { 1395 ip6stat.ip6s_badscope++; 1396 continue; 1397 } 1398 #endif 1399 1400 mifp->m6_pkt_out++; 1401 mifp->m6_bytes_out += plen; 1402 MC6_SEND(ip6, mifp, m); 1403 } 1404 return 0; 1405 } 1406 1407 static void 1408 phyint_send(ip6, mifp, m) 1409 struct ip6_hdr *ip6; 1410 struct mif6 *mifp; 1411 struct mbuf *m; 1412 { 1413 struct mbuf *mb_copy; 1414 struct ifnet *ifp = mifp->m6_ifp; 1415 int error = 0; 1416 int s = splsoftnet(); 1417 static struct route_in6 ro; 1418 struct in6_multi *in6m; 1419 struct sockaddr_in6 *dst6; 1420 1421 /* 1422 * Make a new reference to the packet; make sure that 1423 * the IPv6 header is actually copied, not just referenced, 1424 * so that ip6_output() only scribbles on the copy. 1425 */ 1426 mb_copy = m_copy(m, 0, M_COPYALL); 1427 if (mb_copy && 1428 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1429 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1430 if (mb_copy == NULL) { 1431 splx(s); 1432 return; 1433 } 1434 /* set MCAST flag to the outgoing packet */ 1435 mb_copy->m_flags |= M_MCAST; 1436 1437 /* 1438 * If we sourced the packet, call ip6_output since we may devide 1439 * the packet into fragments when the packet is too big for the 1440 * outgoing interface. 1441 * Otherwise, we can simply send the packet to the interface 1442 * sending queue. 1443 */ 1444 if (m->m_pkthdr.rcvif == NULL) { 1445 struct ip6_moptions im6o; 1446 1447 im6o.im6o_multicast_ifp = ifp; 1448 /* XXX: ip6_output will override ip6->ip6_hlim */ 1449 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1450 im6o.im6o_multicast_loop = 1; 1451 error = ip6_output(mb_copy, NULL, &ro, 1452 IPV6_FORWARDING, &im6o, NULL); 1453 1454 #ifdef MRT6DEBUG 1455 if (mrt6debug & DEBUG_XMIT) 1456 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1457 mifp - mif6table, error); 1458 #endif 1459 splx(s); 1460 return; 1461 } 1462 1463 /* 1464 * If we belong to the destination multicast group 1465 * on the outgoing interface, loop back a copy. 1466 */ 1467 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1468 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1469 if (in6m != NULL) { 1470 dst6->sin6_len = sizeof(struct sockaddr_in6); 1471 dst6->sin6_family = AF_INET6; 1472 dst6->sin6_addr = ip6->ip6_dst; 1473 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1474 } 1475 /* 1476 * Put the packet into the sending queue of the outgoing interface 1477 * if it would fit in the MTU of the interface. 1478 */ 1479 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1480 dst6->sin6_len = sizeof(struct sockaddr_in6); 1481 dst6->sin6_family = AF_INET6; 1482 dst6->sin6_addr = ip6->ip6_dst; 1483 /* 1484 * We just call if_output instead of nd6_output here, since 1485 * we need no ND for a multicast forwarded packet...right? 1486 */ 1487 error = (*ifp->if_output)(ifp, mb_copy, 1488 (struct sockaddr *)&ro.ro_dst, NULL); 1489 #ifdef MRT6DEBUG 1490 if (mrt6debug & DEBUG_XMIT) 1491 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1492 mifp - mif6table, error); 1493 #endif 1494 } else { 1495 #ifdef MULTICAST_PMTUD 1496 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1497 #else 1498 #ifdef MRT6DEBUG 1499 if (mrt6debug & DEBUG_XMIT) 1500 log(LOG_DEBUG, 1501 "phyint_send: packet too big on %s o %s g %s" 1502 " size %d(discarded)\n", 1503 if_name(ifp), 1504 ip6_sprintf(&ip6->ip6_src), 1505 ip6_sprintf(&ip6->ip6_dst), 1506 mb_copy->m_pkthdr.len); 1507 #endif /* MRT6DEBUG */ 1508 m_freem(mb_copy); /* simply discard the packet */ 1509 #endif 1510 } 1511 1512 splx(s); 1513 } 1514 1515 static int 1516 register_send(ip6, mif, m) 1517 struct ip6_hdr *ip6; 1518 struct mif6 *mif; 1519 struct mbuf *m; 1520 { 1521 struct mbuf *mm; 1522 int i, len = m->m_pkthdr.len; 1523 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1524 struct mrt6msg *im6; 1525 1526 #ifdef MRT6DEBUG 1527 if (mrt6debug) 1528 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1529 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1530 #endif 1531 ++pim6stat.pim6s_snd_registers; 1532 1533 /* Make a copy of the packet to send to the user level process */ 1534 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1535 if (mm == NULL) 1536 return ENOBUFS; 1537 mm->m_data += max_linkhdr; 1538 mm->m_len = sizeof(struct ip6_hdr); 1539 1540 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1541 m_freem(mm); 1542 return ENOBUFS; 1543 } 1544 i = MHLEN - M_LEADINGSPACE(mm); 1545 if (i > len) 1546 i = len; 1547 mm = m_pullup(mm, i); 1548 if (mm == NULL){ 1549 m_freem(mm); 1550 return ENOBUFS; 1551 } 1552 /* TODO: check it! */ 1553 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1554 1555 /* 1556 * Send message to routing daemon 1557 */ 1558 sin6.sin6_addr = ip6->ip6_src; 1559 1560 im6 = mtod(mm, struct mrt6msg *); 1561 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1562 im6->im6_mbz = 0; 1563 1564 im6->im6_mif = mif - mif6table; 1565 1566 /* iif info is not given for reg. encap.n */ 1567 mrt6stat.mrt6s_upcalls++; 1568 1569 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1570 #ifdef MRT6DEBUG 1571 if (mrt6debug) 1572 log(LOG_WARNING, 1573 "register_send: ip_mrouter socket queue full\n"); 1574 #endif 1575 ++mrt6stat.mrt6s_upq_sockfull; 1576 return ENOBUFS; 1577 } 1578 return 0; 1579 } 1580 1581 /* 1582 * PIM sparse mode hook 1583 * Receives the pim control messages, and passes them up to the listening 1584 * socket, using rip6_input. 1585 * The only message processed is the REGISTER pim message; the pim header 1586 * is stripped off, and the inner packet is passed to register_mforward. 1587 */ 1588 int 1589 pim6_input(mp, offp, proto) 1590 struct mbuf **mp; 1591 int *offp, proto; 1592 { 1593 struct pim *pim; /* pointer to a pim struct */ 1594 struct ip6_hdr *ip6; 1595 int pimlen; 1596 struct mbuf *m = *mp; 1597 int minlen; 1598 int off = *offp; 1599 1600 ++pim6stat.pim6s_rcv_total; 1601 1602 ip6 = mtod(m, struct ip6_hdr *); 1603 pimlen = m->m_pkthdr.len - *offp; 1604 1605 /* 1606 * Validate lengths 1607 */ 1608 if (pimlen < PIM_MINLEN) { 1609 ++pim6stat.pim6s_rcv_tooshort; 1610 #ifdef MRT6DEBUG 1611 if (mrt6debug & DEBUG_PIM) 1612 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1613 #endif 1614 m_freem(m); 1615 return(IPPROTO_DONE); 1616 } 1617 1618 /* 1619 * if the packet is at least as big as a REGISTER, go ahead 1620 * and grab the PIM REGISTER header size, to avoid another 1621 * possible m_pullup() later. 1622 * 1623 * PIM_MINLEN == pimhdr + u_int32 == 8 1624 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1625 */ 1626 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1627 1628 /* 1629 * Make sure that the IP6 and PIM headers in contiguous memory, and 1630 * possibly the PIM REGISTER header 1631 */ 1632 #ifndef PULLDOWN_TEST 1633 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1634 /* adjust pointer */ 1635 ip6 = mtod(m, struct ip6_hdr *); 1636 1637 /* adjust mbuf to point to the PIM header */ 1638 pim = (struct pim *)((caddr_t)ip6 + off); 1639 #else 1640 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1641 if (pim == NULL) { 1642 pim6stat.pim6s_rcv_tooshort++; 1643 return IPPROTO_DONE; 1644 } 1645 #endif 1646 1647 #define PIM6_CHECKSUM 1648 #ifdef PIM6_CHECKSUM 1649 { 1650 int cksumlen; 1651 1652 /* 1653 * Validate checksum. 1654 * If PIM REGISTER, exclude the data packet 1655 */ 1656 if (pim->pim_type == PIM_REGISTER) 1657 cksumlen = PIM_MINLEN; 1658 else 1659 cksumlen = pimlen; 1660 1661 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1662 ++pim6stat.pim6s_rcv_badsum; 1663 #ifdef MRT6DEBUG 1664 if (mrt6debug & DEBUG_PIM) 1665 log(LOG_DEBUG, 1666 "pim6_input: invalid checksum\n"); 1667 #endif 1668 m_freem(m); 1669 return(IPPROTO_DONE); 1670 } 1671 } 1672 #endif /* PIM_CHECKSUM */ 1673 1674 /* PIM version check */ 1675 if (pim->pim_ver != PIM_VERSION) { 1676 ++pim6stat.pim6s_rcv_badversion; 1677 #ifdef MRT6DEBUG 1678 log(LOG_ERR, 1679 "pim6_input: incorrect version %d, expecting %d\n", 1680 pim->pim_ver, PIM_VERSION); 1681 #endif 1682 m_freem(m); 1683 return(IPPROTO_DONE); 1684 } 1685 1686 if (pim->pim_type == PIM_REGISTER) { 1687 /* 1688 * since this is a REGISTER, we'll make a copy of the register 1689 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1690 * routing daemon. 1691 */ 1692 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1693 1694 struct mbuf *mcp; 1695 struct ip6_hdr *eip6; 1696 u_int32_t *reghdr; 1697 int rc; 1698 1699 ++pim6stat.pim6s_rcv_registers; 1700 1701 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1702 #ifdef MRT6DEBUG 1703 if (mrt6debug & DEBUG_PIM) 1704 log(LOG_DEBUG, 1705 "pim6_input: register mif not set: %d\n", 1706 reg_mif_num); 1707 #endif 1708 m_freem(m); 1709 return(IPPROTO_DONE); 1710 } 1711 1712 reghdr = (u_int32_t *)(pim + 1); 1713 1714 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1715 goto pim6_input_to_daemon; 1716 1717 /* 1718 * Validate length 1719 */ 1720 if (pimlen < PIM6_REG_MINLEN) { 1721 ++pim6stat.pim6s_rcv_tooshort; 1722 ++pim6stat.pim6s_rcv_badregisters; 1723 #ifdef MRT6DEBUG 1724 log(LOG_ERR, 1725 "pim6_input: register packet size too " 1726 "small %d from %s\n", 1727 pimlen, ip6_sprintf(&ip6->ip6_src)); 1728 #endif 1729 m_freem(m); 1730 return(IPPROTO_DONE); 1731 } 1732 1733 eip6 = (struct ip6_hdr *) (reghdr + 1); 1734 #ifdef MRT6DEBUG 1735 if (mrt6debug & DEBUG_PIM) 1736 log(LOG_DEBUG, 1737 "pim6_input[register], eip6: %s -> %s, " 1738 "eip6 plen %d\n", 1739 ip6_sprintf(&eip6->ip6_src), 1740 ip6_sprintf(&eip6->ip6_dst), 1741 ntohs(eip6->ip6_plen)); 1742 #endif 1743 1744 /* verify the version number of the inner packet */ 1745 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1746 ++pim6stat.pim6s_rcv_badregisters; 1747 #ifdef MRT6DEBUG 1748 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1749 "of the inner packet\n", 1750 (eip6->ip6_vfc & IPV6_VERSION)); 1751 #endif 1752 m_freem(m); 1753 return(IPPROTO_NONE); 1754 } 1755 1756 /* verify the inner packet is destined to a mcast group */ 1757 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1758 ++pim6stat.pim6s_rcv_badregisters; 1759 #ifdef MRT6DEBUG 1760 if (mrt6debug & DEBUG_PIM) 1761 log(LOG_DEBUG, 1762 "pim6_input: inner packet of register " 1763 "is not multicast %s\n", 1764 ip6_sprintf(&eip6->ip6_dst)); 1765 #endif 1766 m_freem(m); 1767 return(IPPROTO_DONE); 1768 } 1769 1770 /* 1771 * make a copy of the whole header to pass to the daemon later. 1772 */ 1773 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1774 if (mcp == NULL) { 1775 #ifdef MRT6DEBUG 1776 log(LOG_ERR, 1777 "pim6_input: pim register: " 1778 "could not copy register head\n"); 1779 #endif 1780 m_freem(m); 1781 return(IPPROTO_DONE); 1782 } 1783 1784 /* 1785 * forward the inner ip6 packet; point m_data at the inner ip6. 1786 */ 1787 m_adj(m, off + PIM_MINLEN); 1788 #ifdef MRT6DEBUG 1789 if (mrt6debug & DEBUG_PIM) { 1790 log(LOG_DEBUG, 1791 "pim6_input: forwarding decapsulated register: " 1792 "src %s, dst %s, mif %d\n", 1793 ip6_sprintf(&eip6->ip6_src), 1794 ip6_sprintf(&eip6->ip6_dst), 1795 reg_mif_num); 1796 } 1797 #endif 1798 1799 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1800 (struct sockaddr *) &dst, 1801 (struct rtentry *) NULL); 1802 1803 /* prepare the register head to send to the mrouting daemon */ 1804 m = mcp; 1805 } 1806 1807 /* 1808 * Pass the PIM message up to the daemon; if it is a register message 1809 * pass the 'head' only up to the daemon. This includes the 1810 * encapsulator ip6 header, pim header, register header and the 1811 * encapsulated ip6 header. 1812 */ 1813 pim6_input_to_daemon: 1814 rip6_input(&m, offp, proto); 1815 return(IPPROTO_DONE); 1816 } 1817
Indexes created Tue Sep 23 07:09:52 GMT 2025