ip6_mroute.c revision 1.13
1 /* $NetBSD: ip6_mroute.c,v 1.13 2000/08/29 09:19:43 itojun Exp $ */ 2 /* $KAME: ip6_mroute.c,v 1.31 2000/08/23 03:20:05 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 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 register 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 register 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: return get_pim6(mb); 272 default: 273 m_free(mb); 274 return EOPNOTSUPP; 275 } 276 } 277 278 /* 279 * Handle ioctl commands to obtain information from the cache 280 */ 281 int 282 mrt6_ioctl(cmd, data) 283 int cmd; 284 caddr_t data; 285 { 286 int error = 0; 287 288 switch (cmd) { 289 case SIOCGETSGCNT_IN6: 290 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 291 break; /* for safety */ 292 case SIOCGETMIFCNT_IN6: 293 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 294 break; /* for safety */ 295 default: 296 return (EINVAL); 297 break; 298 } 299 return error; 300 } 301 302 /* 303 * returns the packet, byte, rpf-failure count for the source group provided 304 */ 305 static int 306 get_sg_cnt(req) 307 register struct sioc_sg_req6 *req; 308 { 309 register struct mf6c *rt; 310 int s; 311 312 s = splsoftnet(); 313 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 314 splx(s); 315 if (rt != NULL) { 316 req->pktcnt = rt->mf6c_pkt_cnt; 317 req->bytecnt = rt->mf6c_byte_cnt; 318 req->wrong_if = rt->mf6c_wrong_if; 319 } else 320 return(ESRCH); 321 #if 0 322 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 323 #endif 324 325 return 0; 326 } 327 328 /* 329 * returns the input and output packet and byte counts on the mif provided 330 */ 331 static int 332 get_mif6_cnt(req) 333 register struct sioc_mif_req6 *req; 334 { 335 register mifi_t mifi = req->mifi; 336 337 if (mifi >= nummifs) 338 return EINVAL; 339 340 req->icount = mif6table[mifi].m6_pkt_in; 341 req->ocount = mif6table[mifi].m6_pkt_out; 342 req->ibytes = mif6table[mifi].m6_bytes_in; 343 req->obytes = mif6table[mifi].m6_bytes_out; 344 345 return 0; 346 } 347 348 /* 349 * Get PIM processiong global 350 */ 351 static int 352 get_pim6(m) 353 struct mbuf *m; 354 { 355 int *i; 356 357 i = mtod(m, int *); 358 359 *i = pim6; 360 361 return 0; 362 } 363 364 static int 365 set_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 */ 379 static int 380 ip6_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 */ 429 int 430 ip6_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 = splsoftnet(); 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 } 520 521 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 522 523 /* 524 * Add a mif to the mif table 525 */ 526 static int 527 add_m6if(mifcp) 528 register struct mif6ctl *mifcp; 529 { 530 register struct mif6 *mifp; 531 struct ifnet *ifp; 532 struct in6_ifreq ifr; 533 int error, s; 534 #ifdef notyet 535 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 536 #endif 537 538 if (mifcp->mif6c_mifi >= MAXMIFS) 539 return EINVAL; 540 mifp = mif6table + mifcp->mif6c_mifi; 541 if (mifp->m6_ifp) 542 return EADDRINUSE; /* XXX: is it appropriate? */ 543 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 544 return ENXIO; 545 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 546 547 if (mifcp->mif6c_flags & MIFF_REGISTER) { 548 if (reg_mif_num == (mifi_t)-1) { 549 strcpy(multicast_register_if.if_xname, 550 "register_mif"); /* XXX */ 551 multicast_register_if.if_flags |= IFF_LOOPBACK; 552 multicast_register_if.if_index = mifcp->mif6c_mifi; 553 reg_mif_num = mifcp->mif6c_mifi; 554 } 555 556 ifp = &multicast_register_if; 557 558 } /* if REGISTER */ 559 else { 560 /* Make sure the interface supports multicast */ 561 if ((ifp->if_flags & IFF_MULTICAST) == 0) 562 return EOPNOTSUPP; 563 564 s = splsoftnet(); 565 /* 566 * Enable promiscuous reception of all IPv6 multicasts 567 * from the interface. 568 */ 569 ifr.ifr_addr.sin6_family = AF_INET6; 570 ifr.ifr_addr.sin6_addr = in6addr_any; 571 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 572 splx(s); 573 if (error) 574 return error; 575 } 576 577 s = splsoftnet(); 578 mifp->m6_flags = mifcp->mif6c_flags; 579 mifp->m6_ifp = ifp; 580 #ifdef notyet 581 /* scaling up here allows division by 1024 in critical code */ 582 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 583 #endif 584 /* initialize per mif pkt counters */ 585 mifp->m6_pkt_in = 0; 586 mifp->m6_pkt_out = 0; 587 mifp->m6_bytes_in = 0; 588 mifp->m6_bytes_out = 0; 589 splx(s); 590 591 /* Adjust nummifs up if the mifi is higher than nummifs */ 592 if (nummifs <= mifcp->mif6c_mifi) 593 nummifs = mifcp->mif6c_mifi + 1; 594 595 #ifdef MRT6DEBUG 596 if (mrt6debug) 597 log(LOG_DEBUG, 598 "add_mif #%d, phyint %s%d\n", 599 mifcp->mif6c_mifi, 600 ifp->if_name, ifp->if_unit); 601 #endif 602 603 return 0; 604 } 605 606 /* 607 * Delete a mif from the mif table 608 */ 609 static int 610 del_m6if(mifip) 611 mifi_t *mifip; 612 { 613 register struct mif6 *mifp = mif6table + *mifip; 614 register mifi_t mifi; 615 struct ifnet *ifp; 616 struct in6_ifreq ifr; 617 int s; 618 619 if (*mifip >= nummifs) 620 return EINVAL; 621 if (mifp->m6_ifp == NULL) 622 return EINVAL; 623 624 s = splsoftnet(); 625 626 if (!(mifp->m6_flags & MIFF_REGISTER)) { 627 /* 628 * XXX: what if there is yet IPv4 multicast daemon 629 * using the interface? 630 */ 631 ifp = mifp->m6_ifp; 632 633 ifr.ifr_addr.sin6_family = AF_INET6; 634 ifr.ifr_addr.sin6_addr = in6addr_any; 635 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 636 } 637 638 #ifdef notyet 639 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 640 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 641 #endif 642 bzero((caddr_t)mifp, sizeof (*mifp)); 643 644 /* Adjust nummifs down */ 645 for (mifi = nummifs; mifi > 0; mifi--) 646 if (mif6table[mifi - 1].m6_ifp) 647 break; 648 nummifs = mifi; 649 650 splx(s); 651 652 #ifdef MRT6DEBUG 653 if (mrt6debug) 654 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 655 #endif 656 657 return 0; 658 } 659 660 /* 661 * Add an mfc entry 662 */ 663 static int 664 add_m6fc(mfccp) 665 struct mf6cctl *mfccp; 666 { 667 struct mf6c *rt; 668 u_long hash; 669 struct rtdetq *rte; 670 register u_short nstl; 671 int s; 672 673 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 674 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 675 676 /* If an entry already exists, just update the fields */ 677 if (rt) { 678 #ifdef MRT6DEBUG 679 if (mrt6debug & DEBUG_MFC) 680 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 681 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 682 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 683 mfccp->mf6cc_parent); 684 #endif 685 686 s = splsoftnet(); 687 rt->mf6c_parent = mfccp->mf6cc_parent; 688 rt->mf6c_ifset = mfccp->mf6cc_ifset; 689 splx(s); 690 return 0; 691 } 692 693 /* 694 * Find the entry for which the upcall was made and update 695 */ 696 s = splsoftnet(); 697 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 698 mfccp->mf6cc_mcastgrp.sin6_addr); 699 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 700 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 701 &mfccp->mf6cc_origin.sin6_addr) && 702 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 703 &mfccp->mf6cc_mcastgrp.sin6_addr) && 704 (rt->mf6c_stall != NULL)) { 705 706 if (nstl++) 707 log(LOG_ERR, 708 "add_m6fc: %s o %s g %s p %x dbx %p\n", 709 "multiple kernel entries", 710 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 711 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 712 mfccp->mf6cc_parent, rt->mf6c_stall); 713 714 #ifdef MRT6DEBUG 715 if (mrt6debug & DEBUG_MFC) 716 log(LOG_DEBUG, 717 "add_m6fc o %s g %s p %x dbg %x\n", 718 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 719 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 720 mfccp->mf6cc_parent, rt->mf6c_stall); 721 #endif 722 723 rt->mf6c_origin = mfccp->mf6cc_origin; 724 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 725 rt->mf6c_parent = mfccp->mf6cc_parent; 726 rt->mf6c_ifset = mfccp->mf6cc_ifset; 727 /* initialize pkt counters per src-grp */ 728 rt->mf6c_pkt_cnt = 0; 729 rt->mf6c_byte_cnt = 0; 730 rt->mf6c_wrong_if = 0; 731 732 rt->mf6c_expire = 0; /* Don't clean this guy up */ 733 nexpire[hash]--; 734 735 /* free packets Qed at the end of this entry */ 736 for (rte = rt->mf6c_stall; rte != NULL; ) { 737 struct rtdetq *n = rte->next; 738 ip6_mdq(rte->m, rte->ifp, rt); 739 m_freem(rte->m); 740 #ifdef UPCALL_TIMING 741 collate(&(rte->t)); 742 #endif /* UPCALL_TIMING */ 743 free(rte, M_MRTABLE); 744 rte = n; 745 } 746 rt->mf6c_stall = NULL; 747 } 748 } 749 750 /* 751 * It is possible that an entry is being inserted without an upcall 752 */ 753 if (nstl == 0) { 754 #ifdef MRT6DEBUG 755 if (mrt6debug & DEBUG_MFC) 756 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 757 hash, 758 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 759 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 760 mfccp->mf6cc_parent); 761 #endif 762 763 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 764 765 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 766 &mfccp->mf6cc_origin.sin6_addr)&& 767 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 768 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 769 770 rt->mf6c_origin = mfccp->mf6cc_origin; 771 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 772 rt->mf6c_parent = mfccp->mf6cc_parent; 773 /* initialize pkt counters per src-grp */ 774 rt->mf6c_pkt_cnt = 0; 775 rt->mf6c_byte_cnt = 0; 776 rt->mf6c_wrong_if = 0; 777 778 if (rt->mf6c_expire) 779 nexpire[hash]--; 780 rt->mf6c_expire = 0; 781 } 782 } 783 if (rt == NULL) { 784 /* no upcall, so make a new entry */ 785 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 786 M_NOWAIT); 787 if (rt == NULL) { 788 splx(s); 789 return ENOBUFS; 790 } 791 792 /* insert new entry at head of hash chain */ 793 rt->mf6c_origin = mfccp->mf6cc_origin; 794 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 795 rt->mf6c_parent = mfccp->mf6cc_parent; 796 /* initialize pkt counters per src-grp */ 797 rt->mf6c_pkt_cnt = 0; 798 rt->mf6c_byte_cnt = 0; 799 rt->mf6c_wrong_if = 0; 800 rt->mf6c_expire = 0; 801 rt->mf6c_stall = NULL; 802 803 /* link into table */ 804 rt->mf6c_next = mf6ctable[hash]; 805 mf6ctable[hash] = rt; 806 } 807 } 808 splx(s); 809 return 0; 810 } 811 812 #ifdef UPCALL_TIMING 813 /* 814 * collect delay statistics on the upcalls 815 */ 816 static void 817 collate(t) 818 register struct timeval *t; 819 { 820 register u_long d; 821 register struct timeval tp; 822 register u_long delta; 823 824 GET_TIME(tp); 825 826 if (TV_LT(*t, tp)) 827 { 828 TV_DELTA(tp, *t, delta); 829 830 d = delta >> 10; 831 if (d > UPCALL_MAX) 832 d = UPCALL_MAX; 833 834 ++upcall_data[d]; 835 } 836 } 837 #endif /* UPCALL_TIMING */ 838 839 /* 840 * Delete an mfc entry 841 */ 842 static int 843 del_m6fc(mfccp) 844 struct mf6cctl *mfccp; 845 { 846 struct sockaddr_in6 origin; 847 struct sockaddr_in6 mcastgrp; 848 struct mf6c *rt; 849 struct mf6c **nptr; 850 u_long hash; 851 int s; 852 853 origin = mfccp->mf6cc_origin; 854 mcastgrp = mfccp->mf6cc_mcastgrp; 855 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 856 857 #ifdef MRT6DEBUG 858 if (mrt6debug & DEBUG_MFC) 859 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 860 ip6_sprintf(&origin.sin6_addr), 861 ip6_sprintf(&mcastgrp.sin6_addr)); 862 #endif 863 864 s = splsoftnet(); 865 866 nptr = &mf6ctable[hash]; 867 while ((rt = *nptr) != NULL) { 868 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 869 &rt->mf6c_origin.sin6_addr) && 870 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 871 &rt->mf6c_mcastgrp.sin6_addr) && 872 rt->mf6c_stall == NULL) 873 break; 874 875 nptr = &rt->mf6c_next; 876 } 877 if (rt == NULL) { 878 splx(s); 879 return EADDRNOTAVAIL; 880 } 881 882 *nptr = rt->mf6c_next; 883 free(rt, M_MRTABLE); 884 885 splx(s); 886 887 return 0; 888 } 889 890 static int 891 socket_send(s, mm, src) 892 struct socket *s; 893 struct mbuf *mm; 894 struct sockaddr_in6 *src; 895 { 896 if (s) { 897 if (sbappendaddr(&s->so_rcv, 898 (struct sockaddr *)src, 899 mm, (struct mbuf *)0) != 0) { 900 sorwakeup(s); 901 return 0; 902 } 903 } 904 m_freem(mm); 905 return -1; 906 } 907 908 /* 909 * IPv6 multicast forwarding function. This function assumes that the packet 910 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 911 * pointed to by "ifp", and the packet is to be relayed to other networks 912 * that have members of the packet's destination IPv6 multicast group. 913 * 914 * The packet is returned unscathed to the caller, unless it is 915 * erroneous, in which case a non-zero return value tells the caller to 916 * discard it. 917 */ 918 919 int 920 ip6_mforward(ip6, ifp, m) 921 register struct ip6_hdr *ip6; 922 struct ifnet *ifp; 923 struct mbuf *m; 924 { 925 register struct mf6c *rt; 926 register struct mif6 *mifp; 927 register struct mbuf *mm; 928 int s; 929 mifi_t mifi; 930 long time_second = time.tv_sec; 931 932 #ifdef MRT6DEBUG 933 if (mrt6debug & DEBUG_FORWARD) 934 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 935 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 936 ifp->if_index); 937 #endif 938 939 /* 940 * Don't forward a packet with Hop limit of zero or one, 941 * or a packet destined to a local-only group. 942 */ 943 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 944 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 945 return 0; 946 ip6->ip6_hlim--; 947 948 /* 949 * Source address check: do not forward packets with unspecified 950 * source. It was discussed in July 2000, on ipngwg mailing list. 951 * This is rather more serious than unicast cases, because some 952 * MLD packets can be sent with the unspecified source address 953 * (although such packets must normally set 1 to the hop limit field). 954 */ 955 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 956 ip6stat.ip6s_cantforward++; 957 if (ip6_log_time + ip6_log_interval < time_second) { 958 ip6_log_time = time_second; 959 log(LOG_DEBUG, 960 "cannot forward " 961 "from %s to %s nxt %d received on %s\n", 962 ip6_sprintf(&ip6->ip6_src), 963 ip6_sprintf(&ip6->ip6_dst), 964 ip6->ip6_nxt, 965 if_name(m->m_pkthdr.rcvif)); 966 } 967 return 0; 968 } 969 970 /* 971 * Determine forwarding mifs from the forwarding cache table 972 */ 973 s = splsoftnet(); 974 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 975 976 /* Entry exists, so forward if necessary */ 977 if (rt) { 978 splx(s); 979 return (ip6_mdq(m, ifp, rt)); 980 } else { 981 /* 982 * If we don't have a route for packet's origin, 983 * Make a copy of the packet & 984 * send message to routing daemon 985 */ 986 987 register struct mbuf *mb0; 988 register struct rtdetq *rte; 989 register u_long hash; 990 /* register int i, npkts;*/ 991 #ifdef UPCALL_TIMING 992 struct timeval tp; 993 994 GET_TIME(tp); 995 #endif /* UPCALL_TIMING */ 996 997 mrt6stat.mrt6s_no_route++; 998 #ifdef MRT6DEBUG 999 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1000 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1001 ip6_sprintf(&ip6->ip6_src), 1002 ip6_sprintf(&ip6->ip6_dst)); 1003 #endif 1004 1005 /* 1006 * Allocate mbufs early so that we don't do extra work if we 1007 * are just going to fail anyway. 1008 */ 1009 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1010 M_NOWAIT); 1011 if (rte == NULL) { 1012 splx(s); 1013 return ENOBUFS; 1014 } 1015 mb0 = m_copy(m, 0, M_COPYALL); 1016 /* 1017 * Pullup packet header if needed before storing it, 1018 * as other references may modify it in the meantime. 1019 */ 1020 if (mb0 && 1021 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1022 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1023 if (mb0 == NULL) { 1024 free(rte, M_MRTABLE); 1025 splx(s); 1026 return ENOBUFS; 1027 } 1028 1029 /* is there an upcall waiting for this packet? */ 1030 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1031 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1032 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1033 &rt->mf6c_origin.sin6_addr) && 1034 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1035 &rt->mf6c_mcastgrp.sin6_addr) && 1036 (rt->mf6c_stall != NULL)) 1037 break; 1038 } 1039 1040 if (rt == NULL) { 1041 struct mrt6msg *im; 1042 struct omrt6msg *oim; 1043 1044 /* no upcall, so make a new entry */ 1045 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1046 M_NOWAIT); 1047 if (rt == NULL) { 1048 free(rte, M_MRTABLE); 1049 m_freem(mb0); 1050 splx(s); 1051 return ENOBUFS; 1052 } 1053 /* 1054 * Make a copy of the header to send to the user 1055 * level process 1056 */ 1057 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1058 1059 if (mm == NULL) { 1060 free(rte, M_MRTABLE); 1061 m_freem(mb0); 1062 free(rt, M_MRTABLE); 1063 splx(s); 1064 return ENOBUFS; 1065 } 1066 1067 /* 1068 * Send message to routing daemon 1069 */ 1070 sin6.sin6_addr = ip6->ip6_src; 1071 1072 im = NULL; 1073 oim = NULL; 1074 switch (ip6_mrouter_ver) { 1075 case MRT6_OINIT: 1076 oim = mtod(mm, struct omrt6msg *); 1077 oim->im6_msgtype = MRT6MSG_NOCACHE; 1078 oim->im6_mbz = 0; 1079 break; 1080 case MRT6_INIT: 1081 im = mtod(mm, struct mrt6msg *); 1082 im->im6_msgtype = MRT6MSG_NOCACHE; 1083 im->im6_mbz = 0; 1084 break; 1085 default: 1086 free(rte, M_MRTABLE); 1087 m_freem(mb0); 1088 free(rt, M_MRTABLE); 1089 splx(s); 1090 return EINVAL; 1091 } 1092 1093 #ifdef MRT6DEBUG 1094 if (mrt6debug & DEBUG_FORWARD) 1095 log(LOG_DEBUG, 1096 "getting the iif info in the kernel\n"); 1097 #endif 1098 1099 for (mifp = mif6table, mifi = 0; 1100 mifi < nummifs && mifp->m6_ifp != ifp; 1101 mifp++, mifi++) 1102 ; 1103 1104 switch (ip6_mrouter_ver) { 1105 case MRT6_OINIT: 1106 oim->im6_mif = mifi; 1107 break; 1108 case MRT6_INIT: 1109 im->im6_mif = mifi; 1110 break; 1111 } 1112 1113 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1114 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1115 "socket queue full\n"); 1116 mrt6stat.mrt6s_upq_sockfull++; 1117 free(rte, M_MRTABLE); 1118 m_freem(mb0); 1119 free(rt, M_MRTABLE); 1120 splx(s); 1121 return ENOBUFS; 1122 } 1123 1124 mrt6stat.mrt6s_upcalls++; 1125 1126 /* insert new entry at head of hash chain */ 1127 bzero(rt, sizeof(*rt)); 1128 rt->mf6c_origin.sin6_family = AF_INET6; 1129 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1130 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1131 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1132 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1133 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1134 rt->mf6c_expire = UPCALL_EXPIRE; 1135 nexpire[hash]++; 1136 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1137 1138 /* link into table */ 1139 rt->mf6c_next = mf6ctable[hash]; 1140 mf6ctable[hash] = rt; 1141 /* Add this entry to the end of the queue */ 1142 rt->mf6c_stall = rte; 1143 } else { 1144 /* determine if q has overflowed */ 1145 struct rtdetq **p; 1146 register int npkts = 0; 1147 1148 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1149 if (++npkts > MAX_UPQ6) { 1150 mrt6stat.mrt6s_upq_ovflw++; 1151 free(rte, M_MRTABLE); 1152 m_freem(mb0); 1153 splx(s); 1154 return 0; 1155 } 1156 1157 /* Add this entry to the end of the queue */ 1158 *p = rte; 1159 } 1160 1161 rte->next = NULL; 1162 rte->m = mb0; 1163 rte->ifp = ifp; 1164 #ifdef UPCALL_TIMING 1165 rte->t = tp; 1166 #endif /* UPCALL_TIMING */ 1167 1168 splx(s); 1169 1170 return 0; 1171 } 1172 } 1173 1174 /* 1175 * Clean up cache entries if upcalls are not serviced 1176 * Call from the Slow Timeout mechanism, every half second. 1177 */ 1178 static void 1179 expire_upcalls(unused) 1180 void *unused; 1181 { 1182 struct rtdetq *rte; 1183 struct mf6c *mfc, **nptr; 1184 int i; 1185 int s; 1186 1187 s = splsoftnet(); 1188 for (i = 0; i < MF6CTBLSIZ; i++) { 1189 if (nexpire[i] == 0) 1190 continue; 1191 nptr = &mf6ctable[i]; 1192 while ((mfc = *nptr) != NULL) { 1193 rte = mfc->mf6c_stall; 1194 /* 1195 * Skip real cache entries 1196 * Make sure it wasn't marked to not expire (shouldn't happen) 1197 * If it expires now 1198 */ 1199 if (rte != NULL && 1200 mfc->mf6c_expire != 0 && 1201 --mfc->mf6c_expire == 0) { 1202 #ifdef MRT6DEBUG 1203 if (mrt6debug & DEBUG_EXPIRE) 1204 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1205 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1206 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1207 #endif 1208 /* 1209 * drop all the packets 1210 * free the mbuf with the pkt, if, timing info 1211 */ 1212 do { 1213 struct rtdetq *n = rte->next; 1214 m_freem(rte->m); 1215 free(rte, M_MRTABLE); 1216 rte = n; 1217 } while (rte != NULL); 1218 mrt6stat.mrt6s_cache_cleanups++; 1219 nexpire[i]--; 1220 1221 *nptr = mfc->mf6c_next; 1222 free(mfc, M_MRTABLE); 1223 } else { 1224 nptr = &mfc->mf6c_next; 1225 } 1226 } 1227 } 1228 splx(s); 1229 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1230 expire_upcalls, NULL); 1231 } 1232 1233 /* 1234 * Packet forwarding routine once entry in the cache is made 1235 */ 1236 static int 1237 ip6_mdq(m, ifp, rt) 1238 register struct mbuf *m; 1239 register struct ifnet *ifp; 1240 register struct mf6c *rt; 1241 { 1242 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1243 register mifi_t mifi, iif; 1244 register struct mif6 *mifp; 1245 register int plen = m->m_pkthdr.len; 1246 1247 /* 1248 * Macro to send packet on mif. Since RSVP packets don't get counted on 1249 * input, they shouldn't get counted on output, so statistics keeping is 1250 * seperate. 1251 */ 1252 1253 #define MC6_SEND(ip6, mifp, m) do { \ 1254 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1255 register_send((ip6), (mifp), (m)); \ 1256 else \ 1257 phyint_send((ip6), (mifp), (m)); \ 1258 } while (0) 1259 1260 /* 1261 * Don't forward if it didn't arrive from the parent mif 1262 * for its origin. 1263 */ 1264 mifi = rt->mf6c_parent; 1265 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1266 /* came in the wrong interface */ 1267 #ifdef MRT6DEBUG 1268 if (mrt6debug & DEBUG_FORWARD) 1269 log(LOG_DEBUG, 1270 "wrong if: ifid %d mifi %d mififid %x\n", 1271 ifp->if_index, mifi, 1272 mif6table[mifi].m6_ifp->if_index); 1273 #endif 1274 mrt6stat.mrt6s_wrong_if++; 1275 rt->mf6c_wrong_if++; 1276 /* 1277 * If we are doing PIM processing, and we are forwarding 1278 * packets on this interface, send a message to the 1279 * routing daemon. 1280 */ 1281 /* have to make sure this is a valid mif */ 1282 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1283 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1284 /* 1285 * Check the M_LOOP flag to avoid an 1286 * unnecessary PIM assert. 1287 * XXX: M_LOOP is an ad-hoc hack... 1288 */ 1289 static struct sockaddr_in6 sin6 = 1290 { sizeof(sin6), AF_INET6 }; 1291 1292 register struct mbuf *mm; 1293 struct mrt6msg *im; 1294 struct omrt6msg *oim; 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 oim = NULL; 1305 im = NULL; 1306 switch (ip6_mrouter_ver) { 1307 case MRT6_OINIT: 1308 oim = mtod(mm, struct omrt6msg *); 1309 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1310 oim->im6_mbz = 0; 1311 break; 1312 case MRT6_INIT: 1313 im = mtod(mm, struct mrt6msg *); 1314 im->im6_msgtype = MRT6MSG_WRONGMIF; 1315 break; 1316 default: 1317 m_freem(mm); 1318 return EINVAL; 1319 } 1320 1321 for (mifp = mif6table, iif = 0; 1322 iif < nummifs && mifp && 1323 mifp->m6_ifp != ifp; 1324 mifp++, iif++) 1325 ; 1326 1327 switch (ip6_mrouter_ver) { 1328 case MRT6_OINIT: 1329 oim->im6_mif = iif; 1330 sin6.sin6_addr = oim->im6_src; 1331 break; 1332 case MRT6_INIT: 1333 im->im6_mif = iif; 1334 sin6.sin6_addr = im->im6_src; 1335 break; 1336 } 1337 1338 mrt6stat.mrt6s_upcalls++; 1339 1340 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1341 #ifdef MRT6DEBUG 1342 if (mrt6debug) 1343 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1344 #endif 1345 ++mrt6stat.mrt6s_upq_sockfull; 1346 return ENOBUFS; 1347 } /* if socket Q full */ 1348 } /* if PIM */ 1349 return 0; 1350 } /* if wrong iif */ 1351 1352 /* If I sourced this packet, it counts as output, else it was input. */ 1353 if (m->m_pkthdr.rcvif == NULL) { 1354 /* XXX: is rcvif really NULL when output?? */ 1355 mif6table[mifi].m6_pkt_out++; 1356 mif6table[mifi].m6_bytes_out += plen; 1357 } else { 1358 mif6table[mifi].m6_pkt_in++; 1359 mif6table[mifi].m6_bytes_in += plen; 1360 } 1361 rt->mf6c_pkt_cnt++; 1362 rt->mf6c_byte_cnt += plen; 1363 1364 /* 1365 * For each mif, forward a copy of the packet if there are group 1366 * members downstream on the interface. 1367 */ 1368 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1369 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1370 #ifdef notyet 1371 /* 1372 * check if the outgoing packet is going to break 1373 * a scope boundary. 1374 * XXX For packets through PIM register tunnel 1375 * interface, we believe a routing daemon. 1376 */ 1377 if ((mif6table[rt->mf6c_parent].m6_flags & 1378 MIFF_REGISTER) == 0 && 1379 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1380 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1381 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1382 &ip6->ip6_dst) || 1383 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1384 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1385 &ip6->ip6_src))) { 1386 ip6stat.ip6s_badscope++; 1387 continue; 1388 } 1389 #endif 1390 1391 mifp->m6_pkt_out++; 1392 mifp->m6_bytes_out += plen; 1393 MC6_SEND(ip6, mifp, m); 1394 } 1395 return 0; 1396 } 1397 1398 static void 1399 phyint_send(ip6, mifp, m) 1400 struct ip6_hdr *ip6; 1401 struct mif6 *mifp; 1402 struct mbuf *m; 1403 { 1404 register struct mbuf *mb_copy; 1405 struct ifnet *ifp = mifp->m6_ifp; 1406 int error = 0; 1407 int s = splsoftnet(); 1408 static struct route_in6 ro6; 1409 struct in6_multi *in6m; 1410 1411 /* 1412 * Make a new reference to the packet; make sure that 1413 * the IPv6 header is actually copied, not just referenced, 1414 * so that ip6_output() only scribbles on the copy. 1415 */ 1416 mb_copy = m_copy(m, 0, M_COPYALL); 1417 if (mb_copy && 1418 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1419 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1420 if (mb_copy == NULL) 1421 return; 1422 /* set MCAST flag to the outgoing packet */ 1423 mb_copy->m_flags |= M_MCAST; 1424 1425 /* 1426 * If we sourced the packet, call ip6_output since we may devide 1427 * the packet into fragments when the packet is too big for the 1428 * outgoing interface. 1429 * Otherwise, we can simply send the packet to the interface 1430 * sending queue. 1431 */ 1432 if (m->m_pkthdr.rcvif == NULL) { 1433 struct ip6_moptions im6o; 1434 1435 im6o.im6o_multicast_ifp = ifp; 1436 /* XXX: ip6_output will override ip6->ip6_hlim */ 1437 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1438 im6o.im6o_multicast_loop = 1; 1439 error = ip6_output(mb_copy, NULL, &ro6, 1440 IPV6_FORWARDING, &im6o, NULL); 1441 1442 #ifdef MRT6DEBUG 1443 if (mrt6debug & DEBUG_XMIT) 1444 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1445 mifp - mif6table, error); 1446 #endif 1447 splx(s); 1448 return; 1449 } 1450 1451 /* 1452 * If we belong to the destination multicast group 1453 * on the outgoing interface, loop back a copy. 1454 */ 1455 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1456 if (in6m != NULL) { 1457 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1458 ro6.ro_dst.sin6_family = AF_INET6; 1459 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1460 ip6_mloopback(ifp, m, &ro6.ro_dst); 1461 } 1462 /* 1463 * Put the packet into the sending queue of the outgoing interface 1464 * if it would fit in the MTU of the interface. 1465 */ 1466 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1467 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1468 ro6.ro_dst.sin6_family = AF_INET6; 1469 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1470 /* 1471 * We just call if_output instead of nd6_output here, since 1472 * we need no ND for a multicast forwarded packet...right? 1473 */ 1474 error = (*ifp->if_output)(ifp, mb_copy, 1475 (struct sockaddr *)&ro6.ro_dst, 1476 NULL); 1477 #ifdef MRT6DEBUG 1478 if (mrt6debug & DEBUG_XMIT) 1479 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1480 mifp - mif6table, error); 1481 #endif 1482 } 1483 else { 1484 #ifdef MULTICAST_PMTUD 1485 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1486 return; 1487 #else 1488 #ifdef MRT6DEBUG 1489 if (mrt6debug & DEBUG_DEBUG_XMIT) 1490 log(LOG_DEBUG, 1491 "phyint_send: packet too big on %s o %s g %s" 1492 " size %d(discarded)\n", 1493 ifp->if_xname, 1494 ip6_sprintf(&ip6->ip6_src), 1495 ip6_sprintf(&ip6->ip6_dst), 1496 mb_copy->m_pkthdr.len); 1497 #endif /* MRT6DEBUG */ 1498 m_freem(mb_copy); /* simply discard the packet */ 1499 return; 1500 #endif 1501 } 1502 } 1503 1504 static int 1505 register_send(ip6, mif, m) 1506 register struct ip6_hdr *ip6; 1507 struct mif6 *mif; 1508 register struct mbuf *m; 1509 { 1510 register struct mbuf *mm; 1511 register int i, len = m->m_pkthdr.len; 1512 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1513 struct mrt6msg *im6; 1514 1515 #ifdef MRT6DEBUG 1516 if (mrt6debug) 1517 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1518 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1519 #endif 1520 ++pim6stat.pim6s_snd_registers; 1521 1522 /* Make a copy of the packet to send to the user level process */ 1523 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1524 if (mm == NULL) 1525 return ENOBUFS; 1526 mm->m_data += max_linkhdr; 1527 mm->m_len = sizeof(struct ip6_hdr); 1528 1529 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1530 m_freem(mm); 1531 return ENOBUFS; 1532 } 1533 i = MHLEN - M_LEADINGSPACE(mm); 1534 if (i > len) 1535 i = len; 1536 mm = m_pullup(mm, i); 1537 if (mm == NULL){ 1538 m_freem(mm); 1539 return ENOBUFS; 1540 } 1541 /* TODO: check it! */ 1542 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1543 1544 /* 1545 * Send message to routing daemon 1546 */ 1547 sin6.sin6_addr = ip6->ip6_src; 1548 1549 im6 = mtod(mm, struct mrt6msg *); 1550 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1551 im6->im6_mbz = 0; 1552 1553 im6->im6_mif = mif - mif6table; 1554 1555 /* iif info is not given for reg. encap.n */ 1556 mrt6stat.mrt6s_upcalls++; 1557 1558 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1559 #ifdef MRT6DEBUG 1560 if (mrt6debug) 1561 log(LOG_WARNING, 1562 "register_send: ip_mrouter socket queue full\n"); 1563 #endif 1564 ++mrt6stat.mrt6s_upq_sockfull; 1565 return ENOBUFS; 1566 } 1567 return 0; 1568 } 1569 1570 /* 1571 * PIM sparse mode hook 1572 * Receives the pim control messages, and passes them up to the listening 1573 * socket, using rip6_input. 1574 * The only message processed is the REGISTER pim message; the pim header 1575 * is stripped off, and the inner packet is passed to register_mforward. 1576 */ 1577 int 1578 pim6_input(mp, offp, proto) 1579 struct mbuf **mp; 1580 int *offp, proto; 1581 { 1582 register struct pim *pim; /* pointer to a pim struct */ 1583 register struct ip6_hdr *ip6; 1584 register int pimlen; 1585 struct mbuf *m = *mp; 1586 int minlen; 1587 int off = *offp; 1588 1589 ++pim6stat.pim6s_rcv_total; 1590 1591 ip6 = mtod(m, struct ip6_hdr *); 1592 pimlen = m->m_pkthdr.len - *offp; 1593 1594 /* 1595 * Validate lengths 1596 */ 1597 if (pimlen < PIM_MINLEN) { 1598 ++pim6stat.pim6s_rcv_tooshort; 1599 #ifdef MRT6DEBUG 1600 if (mrt6debug & DEBUG_PIM) 1601 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1602 #endif 1603 m_freem(m); 1604 return(IPPROTO_DONE); 1605 } 1606 1607 /* 1608 * if the packet is at least as big as a REGISTER, go ahead 1609 * and grab the PIM REGISTER header size, to avoid another 1610 * possible m_pullup() later. 1611 * 1612 * PIM_MINLEN == pimhdr + u_int32 == 8 1613 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1614 */ 1615 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1616 1617 /* 1618 * Make sure that the IP6 and PIM headers in contiguous memory, and 1619 * possibly the PIM REGISTER header 1620 */ 1621 #ifndef PULLDOWN_TEST 1622 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1623 /* adjust pointer */ 1624 ip6 = mtod(m, struct ip6_hdr *); 1625 1626 /* adjust mbuf to point to the PIM header */ 1627 pim = (struct pim *)((caddr_t)ip6 + off); 1628 #else 1629 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1630 if (pim == NULL) { 1631 pim6stat.pim6s_rcv_tooshort++; 1632 return IPPROTO_DONE; 1633 } 1634 #endif 1635 1636 #define PIM6_CHECKSUM 1637 #ifdef PIM6_CHECKSUM 1638 { 1639 int cksumlen; 1640 1641 /* 1642 * Validate checksum. 1643 * If PIM REGISTER, exclude the data packet 1644 */ 1645 if (pim->pim_type == PIM_REGISTER) 1646 cksumlen = PIM_MINLEN; 1647 else 1648 cksumlen = pimlen; 1649 1650 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1651 ++pim6stat.pim6s_rcv_badsum; 1652 #ifdef MRT6DEBUG 1653 if (mrt6debug & DEBUG_PIM) 1654 log(LOG_DEBUG, 1655 "pim6_input: invalid checksum\n"); 1656 #endif 1657 m_freem(m); 1658 return(IPPROTO_DONE); 1659 } 1660 } 1661 #endif /* PIM_CHECKSUM */ 1662 1663 /* PIM version check */ 1664 if (pim->pim_ver != PIM_VERSION) { 1665 ++pim6stat.pim6s_rcv_badversion; 1666 #ifdef MRT6DEBUG 1667 log(LOG_ERR, 1668 "pim6_input: incorrect version %d, expecting %d\n", 1669 pim->pim_ver, PIM_VERSION); 1670 #endif 1671 m_freem(m); 1672 return(IPPROTO_DONE); 1673 } 1674 1675 if (pim->pim_type == PIM_REGISTER) { 1676 /* 1677 * since this is a REGISTER, we'll make a copy of the register 1678 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1679 * routing daemon. 1680 */ 1681 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1682 1683 struct mbuf *mcp; 1684 struct ip6_hdr *eip6; 1685 u_int32_t *reghdr; 1686 int rc; 1687 1688 ++pim6stat.pim6s_rcv_registers; 1689 1690 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1691 #ifdef MRT6DEBUG 1692 if (mrt6debug & DEBUG_PIM) 1693 log(LOG_DEBUG, 1694 "pim6_input: register mif not set: %d\n", 1695 reg_mif_num); 1696 #endif 1697 m_freem(m); 1698 return(IPPROTO_DONE); 1699 } 1700 1701 reghdr = (u_int32_t *)(pim + 1); 1702 1703 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1704 goto pim6_input_to_daemon; 1705 1706 /* 1707 * Validate length 1708 */ 1709 if (pimlen < PIM6_REG_MINLEN) { 1710 ++pim6stat.pim6s_rcv_tooshort; 1711 ++pim6stat.pim6s_rcv_badregisters; 1712 #ifdef MRT6DEBUG 1713 log(LOG_ERR, 1714 "pim6_input: register packet size too " 1715 "small %d from %s\n", 1716 pimlen, ip6_sprintf(&ip6->ip6_src)); 1717 #endif 1718 m_freem(m); 1719 return(IPPROTO_DONE); 1720 } 1721 1722 eip6 = (struct ip6_hdr *) (reghdr + 1); 1723 #ifdef MRT6DEBUG 1724 if (mrt6debug & DEBUG_PIM) 1725 log(LOG_DEBUG, 1726 "pim6_input[register], eip6: %s -> %s, " 1727 "eip6 plen %d\n", 1728 ip6_sprintf(&eip6->ip6_src), 1729 ip6_sprintf(&eip6->ip6_dst), 1730 ntohs(eip6->ip6_plen)); 1731 #endif 1732 1733 /* verify the inner packet is destined to a mcast group */ 1734 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1735 ++pim6stat.pim6s_rcv_badregisters; 1736 #ifdef MRT6DEBUG 1737 if (mrt6debug & DEBUG_PIM) 1738 log(LOG_DEBUG, 1739 "pim6_input: inner packet of register " 1740 "is not multicast %s\n", 1741 ip6_sprintf(&eip6->ip6_dst)); 1742 #endif 1743 m_freem(m); 1744 return(IPPROTO_DONE); 1745 } 1746 1747 /* 1748 * make a copy of the whole header to pass to the daemon later. 1749 */ 1750 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1751 if (mcp == NULL) { 1752 #ifdef MRT6DEBUG 1753 log(LOG_ERR, 1754 "pim6_input: pim register: " 1755 "could not copy register head\n"); 1756 #endif 1757 m_freem(m); 1758 return(IPPROTO_DONE); 1759 } 1760 1761 /* 1762 * forward the inner ip6 packet; point m_data at the inner ip6. 1763 */ 1764 m_adj(m, off + PIM_MINLEN); 1765 #ifdef MRT6DEBUG 1766 if (mrt6debug & DEBUG_PIM) { 1767 log(LOG_DEBUG, 1768 "pim6_input: forwarding decapsulated register: " 1769 "src %s, dst %s, mif %d\n", 1770 ip6_sprintf(&eip6->ip6_src), 1771 ip6_sprintf(&eip6->ip6_dst), 1772 reg_mif_num); 1773 } 1774 #endif 1775 1776 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1777 (struct sockaddr *) &dst, 1778 (struct rtentry *) NULL); 1779 1780 /* prepare the register head to send to the mrouting daemon */ 1781 m = mcp; 1782 } 1783 1784 /* 1785 * Pass the PIM message up to the daemon; if it is a register message 1786 * pass the 'head' only up to the daemon. This includes the 1787 * encapsulator ip6 header, pim header, register header and the 1788 * encapsulated ip6 header. 1789 */ 1790 pim6_input_to_daemon: 1791 rip6_input(&m, offp, proto); 1792 return(IPPROTO_DONE); 1793 } 1794
Indexes created Mon Sep 22 13:09:51 GMT 2025