ip6_mroute.c revision 1.16
1 /* $NetBSD: ip6_mroute.c,v 1.16 2001/02/10 03:06:39 itojun Exp $ */ 2 /* $KAME: ip6_mroute.c,v 1.39 2001/02/10 02:13:13 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 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: 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 struct sioc_sg_req6 *req; 308 { 309 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 struct sioc_mif_req6 *req; 334 { 335 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 struct mif6ctl *mifcp; 529 { 530 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 struct mif6 *mifp = mif6table + *mifip; 614 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 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 rt->mf6c_ifset = mfccp->mf6cc_ifset; 774 /* initialize pkt counters per src-grp */ 775 rt->mf6c_pkt_cnt = 0; 776 rt->mf6c_byte_cnt = 0; 777 rt->mf6c_wrong_if = 0; 778 779 if (rt->mf6c_expire) 780 nexpire[hash]--; 781 rt->mf6c_expire = 0; 782 } 783 } 784 if (rt == NULL) { 785 /* no upcall, so make a new entry */ 786 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 787 M_NOWAIT); 788 if (rt == NULL) { 789 splx(s); 790 return ENOBUFS; 791 } 792 793 /* insert new entry at head of hash chain */ 794 rt->mf6c_origin = mfccp->mf6cc_origin; 795 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 796 rt->mf6c_parent = mfccp->mf6cc_parent; 797 rt->mf6c_ifset = mfccp->mf6cc_ifset; 798 /* initialize pkt counters per src-grp */ 799 rt->mf6c_pkt_cnt = 0; 800 rt->mf6c_byte_cnt = 0; 801 rt->mf6c_wrong_if = 0; 802 rt->mf6c_expire = 0; 803 rt->mf6c_stall = NULL; 804 805 /* link into table */ 806 rt->mf6c_next = mf6ctable[hash]; 807 mf6ctable[hash] = rt; 808 } 809 } 810 splx(s); 811 return 0; 812 } 813 814 #ifdef UPCALL_TIMING 815 /* 816 * collect delay statistics on the upcalls 817 */ 818 static void 819 collate(t) 820 struct timeval *t; 821 { 822 u_long d; 823 struct timeval tp; 824 u_long delta; 825 826 GET_TIME(tp); 827 828 if (TV_LT(*t, tp)) 829 { 830 TV_DELTA(tp, *t, delta); 831 832 d = delta >> 10; 833 if (d > UPCALL_MAX) 834 d = UPCALL_MAX; 835 836 ++upcall_data[d]; 837 } 838 } 839 #endif /* UPCALL_TIMING */ 840 841 /* 842 * Delete an mfc entry 843 */ 844 static int 845 del_m6fc(mfccp) 846 struct mf6cctl *mfccp; 847 { 848 struct sockaddr_in6 origin; 849 struct sockaddr_in6 mcastgrp; 850 struct mf6c *rt; 851 struct mf6c **nptr; 852 u_long hash; 853 int s; 854 855 origin = mfccp->mf6cc_origin; 856 mcastgrp = mfccp->mf6cc_mcastgrp; 857 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 858 859 #ifdef MRT6DEBUG 860 if (mrt6debug & DEBUG_MFC) 861 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 862 ip6_sprintf(&origin.sin6_addr), 863 ip6_sprintf(&mcastgrp.sin6_addr)); 864 #endif 865 866 s = splsoftnet(); 867 868 nptr = &mf6ctable[hash]; 869 while ((rt = *nptr) != NULL) { 870 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 871 &rt->mf6c_origin.sin6_addr) && 872 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 873 &rt->mf6c_mcastgrp.sin6_addr) && 874 rt->mf6c_stall == NULL) 875 break; 876 877 nptr = &rt->mf6c_next; 878 } 879 if (rt == NULL) { 880 splx(s); 881 return EADDRNOTAVAIL; 882 } 883 884 *nptr = rt->mf6c_next; 885 free(rt, M_MRTABLE); 886 887 splx(s); 888 889 return 0; 890 } 891 892 static int 893 socket_send(s, mm, src) 894 struct socket *s; 895 struct mbuf *mm; 896 struct sockaddr_in6 *src; 897 { 898 if (s) { 899 if (sbappendaddr(&s->so_rcv, 900 (struct sockaddr *)src, 901 mm, (struct mbuf *)0) != 0) { 902 sorwakeup(s); 903 return 0; 904 } 905 } 906 m_freem(mm); 907 return -1; 908 } 909 910 /* 911 * IPv6 multicast forwarding function. This function assumes that the packet 912 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 913 * pointed to by "ifp", and the packet is to be relayed to other networks 914 * that have members of the packet's destination IPv6 multicast group. 915 * 916 * The packet is returned unscathed to the caller, unless it is 917 * erroneous, in which case a non-zero return value tells the caller to 918 * discard it. 919 */ 920 921 int 922 ip6_mforward(ip6, ifp, m) 923 struct ip6_hdr *ip6; 924 struct ifnet *ifp; 925 struct mbuf *m; 926 { 927 struct mf6c *rt; 928 struct mif6 *mifp; 929 struct mbuf *mm; 930 int s; 931 mifi_t mifi; 932 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 933 long time_second = time.tv_sec; 934 #endif 935 936 #ifdef MRT6DEBUG 937 if (mrt6debug & DEBUG_FORWARD) 938 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 939 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 940 ifp->if_index); 941 #endif 942 943 /* 944 * Don't forward a packet with Hop limit of zero or one, 945 * or a packet destined to a local-only group. 946 */ 947 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 948 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 949 return 0; 950 ip6->ip6_hlim--; 951 952 /* 953 * Source address check: do not forward packets with unspecified 954 * source. It was discussed in July 2000, on ipngwg mailing list. 955 * This is rather more serious than unicast cases, because some 956 * MLD packets can be sent with the unspecified source address 957 * (although such packets must normally set 1 to the hop limit field). 958 */ 959 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 960 ip6stat.ip6s_cantforward++; 961 if (ip6_log_time + ip6_log_interval < time_second) { 962 ip6_log_time = time_second; 963 log(LOG_DEBUG, 964 "cannot forward " 965 "from %s to %s nxt %d received on %s\n", 966 ip6_sprintf(&ip6->ip6_src), 967 ip6_sprintf(&ip6->ip6_dst), 968 ip6->ip6_nxt, 969 if_name(m->m_pkthdr.rcvif)); 970 } 971 return 0; 972 } 973 974 /* 975 * Determine forwarding mifs from the forwarding cache table 976 */ 977 s = splsoftnet(); 978 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 979 980 /* Entry exists, so forward if necessary */ 981 if (rt) { 982 splx(s); 983 return (ip6_mdq(m, ifp, rt)); 984 } else { 985 /* 986 * If we don't have a route for packet's origin, 987 * Make a copy of the packet & 988 * send message to routing daemon 989 */ 990 991 struct mbuf *mb0; 992 struct rtdetq *rte; 993 u_long hash; 994 /* int i, npkts;*/ 995 #ifdef UPCALL_TIMING 996 struct timeval tp; 997 998 GET_TIME(tp); 999 #endif /* UPCALL_TIMING */ 1000 1001 mrt6stat.mrt6s_no_route++; 1002 #ifdef MRT6DEBUG 1003 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1004 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1005 ip6_sprintf(&ip6->ip6_src), 1006 ip6_sprintf(&ip6->ip6_dst)); 1007 #endif 1008 1009 /* 1010 * Allocate mbufs early so that we don't do extra work if we 1011 * are just going to fail anyway. 1012 */ 1013 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1014 M_NOWAIT); 1015 if (rte == NULL) { 1016 splx(s); 1017 return ENOBUFS; 1018 } 1019 mb0 = m_copy(m, 0, M_COPYALL); 1020 /* 1021 * Pullup packet header if needed before storing it, 1022 * as other references may modify it in the meantime. 1023 */ 1024 if (mb0 && 1025 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1026 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1027 if (mb0 == NULL) { 1028 free(rte, M_MRTABLE); 1029 splx(s); 1030 return ENOBUFS; 1031 } 1032 1033 /* is there an upcall waiting for this packet? */ 1034 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1035 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1036 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1037 &rt->mf6c_origin.sin6_addr) && 1038 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1039 &rt->mf6c_mcastgrp.sin6_addr) && 1040 (rt->mf6c_stall != NULL)) 1041 break; 1042 } 1043 1044 if (rt == NULL) { 1045 struct mrt6msg *im; 1046 struct omrt6msg *oim; 1047 1048 /* no upcall, so make a new entry */ 1049 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1050 M_NOWAIT); 1051 if (rt == NULL) { 1052 free(rte, M_MRTABLE); 1053 m_freem(mb0); 1054 splx(s); 1055 return ENOBUFS; 1056 } 1057 /* 1058 * Make a copy of the header to send to the user 1059 * level process 1060 */ 1061 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1062 1063 if (mm == NULL) { 1064 free(rte, M_MRTABLE); 1065 m_freem(mb0); 1066 free(rt, M_MRTABLE); 1067 splx(s); 1068 return ENOBUFS; 1069 } 1070 1071 /* 1072 * Send message to routing daemon 1073 */ 1074 sin6.sin6_addr = ip6->ip6_src; 1075 1076 im = NULL; 1077 oim = NULL; 1078 switch (ip6_mrouter_ver) { 1079 case MRT6_OINIT: 1080 oim = mtod(mm, struct omrt6msg *); 1081 oim->im6_msgtype = MRT6MSG_NOCACHE; 1082 oim->im6_mbz = 0; 1083 break; 1084 case MRT6_INIT: 1085 im = mtod(mm, struct mrt6msg *); 1086 im->im6_msgtype = MRT6MSG_NOCACHE; 1087 im->im6_mbz = 0; 1088 break; 1089 default: 1090 free(rte, M_MRTABLE); 1091 m_freem(mb0); 1092 free(rt, M_MRTABLE); 1093 splx(s); 1094 return EINVAL; 1095 } 1096 1097 #ifdef MRT6DEBUG 1098 if (mrt6debug & DEBUG_FORWARD) 1099 log(LOG_DEBUG, 1100 "getting the iif info in the kernel\n"); 1101 #endif 1102 1103 for (mifp = mif6table, mifi = 0; 1104 mifi < nummifs && mifp->m6_ifp != ifp; 1105 mifp++, mifi++) 1106 ; 1107 1108 switch (ip6_mrouter_ver) { 1109 case MRT6_OINIT: 1110 oim->im6_mif = mifi; 1111 break; 1112 case MRT6_INIT: 1113 im->im6_mif = mifi; 1114 break; 1115 } 1116 1117 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1118 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1119 "socket queue full\n"); 1120 mrt6stat.mrt6s_upq_sockfull++; 1121 free(rte, M_MRTABLE); 1122 m_freem(mb0); 1123 free(rt, M_MRTABLE); 1124 splx(s); 1125 return ENOBUFS; 1126 } 1127 1128 mrt6stat.mrt6s_upcalls++; 1129 1130 /* insert new entry at head of hash chain */ 1131 bzero(rt, sizeof(*rt)); 1132 rt->mf6c_origin.sin6_family = AF_INET6; 1133 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1134 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1135 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1136 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1137 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1138 rt->mf6c_expire = UPCALL_EXPIRE; 1139 nexpire[hash]++; 1140 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1141 1142 /* link into table */ 1143 rt->mf6c_next = mf6ctable[hash]; 1144 mf6ctable[hash] = rt; 1145 /* Add this entry to the end of the queue */ 1146 rt->mf6c_stall = rte; 1147 } else { 1148 /* determine if q has overflowed */ 1149 struct rtdetq **p; 1150 int npkts = 0; 1151 1152 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1153 if (++npkts > MAX_UPQ6) { 1154 mrt6stat.mrt6s_upq_ovflw++; 1155 free(rte, M_MRTABLE); 1156 m_freem(mb0); 1157 splx(s); 1158 return 0; 1159 } 1160 1161 /* Add this entry to the end of the queue */ 1162 *p = rte; 1163 } 1164 1165 rte->next = NULL; 1166 rte->m = mb0; 1167 rte->ifp = ifp; 1168 #ifdef UPCALL_TIMING 1169 rte->t = tp; 1170 #endif /* UPCALL_TIMING */ 1171 1172 splx(s); 1173 1174 return 0; 1175 } 1176 } 1177 1178 /* 1179 * Clean up cache entries if upcalls are not serviced 1180 * Call from the Slow Timeout mechanism, every half second. 1181 */ 1182 static void 1183 expire_upcalls(unused) 1184 void *unused; 1185 { 1186 struct rtdetq *rte; 1187 struct mf6c *mfc, **nptr; 1188 int i; 1189 int s; 1190 1191 s = splsoftnet(); 1192 for (i = 0; i < MF6CTBLSIZ; i++) { 1193 if (nexpire[i] == 0) 1194 continue; 1195 nptr = &mf6ctable[i]; 1196 while ((mfc = *nptr) != NULL) { 1197 rte = mfc->mf6c_stall; 1198 /* 1199 * Skip real cache entries 1200 * Make sure it wasn't marked to not expire (shouldn't happen) 1201 * If it expires now 1202 */ 1203 if (rte != NULL && 1204 mfc->mf6c_expire != 0 && 1205 --mfc->mf6c_expire == 0) { 1206 #ifdef MRT6DEBUG 1207 if (mrt6debug & DEBUG_EXPIRE) 1208 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1209 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1210 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1211 #endif 1212 /* 1213 * drop all the packets 1214 * free the mbuf with the pkt, if, timing info 1215 */ 1216 do { 1217 struct rtdetq *n = rte->next; 1218 m_freem(rte->m); 1219 free(rte, M_MRTABLE); 1220 rte = n; 1221 } while (rte != NULL); 1222 mrt6stat.mrt6s_cache_cleanups++; 1223 nexpire[i]--; 1224 1225 *nptr = mfc->mf6c_next; 1226 free(mfc, M_MRTABLE); 1227 } else { 1228 nptr = &mfc->mf6c_next; 1229 } 1230 } 1231 } 1232 splx(s); 1233 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1234 expire_upcalls, NULL); 1235 } 1236 1237 /* 1238 * Packet forwarding routine once entry in the cache is made 1239 */ 1240 static int 1241 ip6_mdq(m, ifp, rt) 1242 struct mbuf *m; 1243 struct ifnet *ifp; 1244 struct mf6c *rt; 1245 { 1246 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1247 mifi_t mifi, iif; 1248 struct mif6 *mifp; 1249 int plen = m->m_pkthdr.len; 1250 1251 /* 1252 * Macro to send packet on mif. Since RSVP packets don't get counted on 1253 * input, they shouldn't get counted on output, so statistics keeping is 1254 * seperate. 1255 */ 1256 1257 #define MC6_SEND(ip6, mifp, m) do { \ 1258 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1259 register_send((ip6), (mifp), (m)); \ 1260 else \ 1261 phyint_send((ip6), (mifp), (m)); \ 1262 } while (0) 1263 1264 /* 1265 * Don't forward if it didn't arrive from the parent mif 1266 * for its origin. 1267 */ 1268 mifi = rt->mf6c_parent; 1269 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1270 /* came in the wrong interface */ 1271 #ifdef MRT6DEBUG 1272 if (mrt6debug & DEBUG_FORWARD) 1273 log(LOG_DEBUG, 1274 "wrong if: ifid %d mifi %d mififid %x\n", 1275 ifp->if_index, mifi, 1276 mif6table[mifi].m6_ifp->if_index); 1277 #endif 1278 mrt6stat.mrt6s_wrong_if++; 1279 rt->mf6c_wrong_if++; 1280 /* 1281 * If we are doing PIM processing, and we are forwarding 1282 * packets on this interface, send a message to the 1283 * routing daemon. 1284 */ 1285 /* have to make sure this is a valid mif */ 1286 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1287 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1288 /* 1289 * Check the M_LOOP flag to avoid an 1290 * unnecessary PIM assert. 1291 * XXX: M_LOOP is an ad-hoc hack... 1292 */ 1293 static struct sockaddr_in6 sin6 = 1294 { sizeof(sin6), AF_INET6 }; 1295 1296 struct mbuf *mm; 1297 struct mrt6msg *im; 1298 struct omrt6msg *oim; 1299 1300 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1301 if (mm && 1302 (M_HASCL(mm) || 1303 mm->m_len < sizeof(struct ip6_hdr))) 1304 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1305 if (mm == NULL) 1306 return ENOBUFS; 1307 1308 oim = NULL; 1309 im = NULL; 1310 switch (ip6_mrouter_ver) { 1311 case MRT6_OINIT: 1312 oim = mtod(mm, struct omrt6msg *); 1313 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1314 oim->im6_mbz = 0; 1315 break; 1316 case MRT6_INIT: 1317 im = mtod(mm, struct mrt6msg *); 1318 im->im6_msgtype = MRT6MSG_WRONGMIF; 1319 im->im6_mbz = 0; 1320 break; 1321 default: 1322 m_freem(mm); 1323 return EINVAL; 1324 } 1325 1326 for (mifp = mif6table, iif = 0; 1327 iif < nummifs && mifp && 1328 mifp->m6_ifp != ifp; 1329 mifp++, iif++) 1330 ; 1331 1332 switch (ip6_mrouter_ver) { 1333 case MRT6_OINIT: 1334 oim->im6_mif = iif; 1335 sin6.sin6_addr = oim->im6_src; 1336 break; 1337 case MRT6_INIT: 1338 im->im6_mif = iif; 1339 sin6.sin6_addr = im->im6_src; 1340 break; 1341 } 1342 1343 mrt6stat.mrt6s_upcalls++; 1344 1345 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1346 #ifdef MRT6DEBUG 1347 if (mrt6debug) 1348 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1349 #endif 1350 ++mrt6stat.mrt6s_upq_sockfull; 1351 return ENOBUFS; 1352 } /* if socket Q full */ 1353 } /* if PIM */ 1354 return 0; 1355 } /* if wrong iif */ 1356 1357 /* If I sourced this packet, it counts as output, else it was input. */ 1358 if (m->m_pkthdr.rcvif == NULL) { 1359 /* XXX: is rcvif really NULL when output?? */ 1360 mif6table[mifi].m6_pkt_out++; 1361 mif6table[mifi].m6_bytes_out += plen; 1362 } else { 1363 mif6table[mifi].m6_pkt_in++; 1364 mif6table[mifi].m6_bytes_in += plen; 1365 } 1366 rt->mf6c_pkt_cnt++; 1367 rt->mf6c_byte_cnt += plen; 1368 1369 /* 1370 * For each mif, forward a copy of the packet if there are group 1371 * members downstream on the interface. 1372 */ 1373 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1374 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1375 #ifdef notyet 1376 /* 1377 * check if the outgoing packet is going to break 1378 * a scope boundary. 1379 * XXX For packets through PIM register tunnel 1380 * interface, we believe a routing daemon. 1381 */ 1382 if ((mif6table[rt->mf6c_parent].m6_flags & 1383 MIFF_REGISTER) == 0 && 1384 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1385 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1386 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1387 &ip6->ip6_dst) || 1388 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1389 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1390 &ip6->ip6_src))) { 1391 ip6stat.ip6s_badscope++; 1392 continue; 1393 } 1394 #endif 1395 1396 mifp->m6_pkt_out++; 1397 mifp->m6_bytes_out += plen; 1398 MC6_SEND(ip6, mifp, m); 1399 } 1400 return 0; 1401 } 1402 1403 static void 1404 phyint_send(ip6, mifp, m) 1405 struct ip6_hdr *ip6; 1406 struct mif6 *mifp; 1407 struct mbuf *m; 1408 { 1409 struct mbuf *mb_copy; 1410 struct ifnet *ifp = mifp->m6_ifp; 1411 int error = 0; 1412 int s = splsoftnet(); 1413 static struct route_in6 ro; 1414 struct in6_multi *in6m; 1415 struct sockaddr_in6 *dst6; 1416 1417 /* 1418 * Make a new reference to the packet; make sure that 1419 * the IPv6 header is actually copied, not just referenced, 1420 * so that ip6_output() only scribbles on the copy. 1421 */ 1422 mb_copy = m_copy(m, 0, M_COPYALL); 1423 if (mb_copy && 1424 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1425 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1426 if (mb_copy == NULL) 1427 return; 1428 /* set MCAST flag to the outgoing packet */ 1429 mb_copy->m_flags |= M_MCAST; 1430 1431 /* 1432 * If we sourced the packet, call ip6_output since we may devide 1433 * the packet into fragments when the packet is too big for the 1434 * outgoing interface. 1435 * Otherwise, we can simply send the packet to the interface 1436 * sending queue. 1437 */ 1438 if (m->m_pkthdr.rcvif == NULL) { 1439 struct ip6_moptions im6o; 1440 1441 im6o.im6o_multicast_ifp = ifp; 1442 /* XXX: ip6_output will override ip6->ip6_hlim */ 1443 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1444 im6o.im6o_multicast_loop = 1; 1445 error = ip6_output(mb_copy, NULL, &ro, 1446 IPV6_FORWARDING, &im6o, NULL); 1447 1448 #ifdef MRT6DEBUG 1449 if (mrt6debug & DEBUG_XMIT) 1450 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1451 mifp - mif6table, error); 1452 #endif 1453 splx(s); 1454 return; 1455 } 1456 1457 /* 1458 * If we belong to the destination multicast group 1459 * on the outgoing interface, loop back a copy. 1460 */ 1461 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1462 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1463 if (in6m != NULL) { 1464 dst6->sin6_len = sizeof(struct sockaddr_in6); 1465 dst6->sin6_family = AF_INET6; 1466 dst6->sin6_addr = ip6->ip6_dst; 1467 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1468 } 1469 /* 1470 * Put the packet into the sending queue of the outgoing interface 1471 * if it would fit in the MTU of the interface. 1472 */ 1473 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1474 dst6->sin6_len = sizeof(struct sockaddr_in6); 1475 dst6->sin6_family = AF_INET6; 1476 dst6->sin6_addr = ip6->ip6_dst; 1477 /* 1478 * We just call if_output instead of nd6_output here, since 1479 * we need no ND for a multicast forwarded packet...right? 1480 */ 1481 error = (*ifp->if_output)(ifp, mb_copy, 1482 (struct sockaddr *)&ro.ro_dst, NULL); 1483 #ifdef MRT6DEBUG 1484 if (mrt6debug & DEBUG_XMIT) 1485 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1486 mifp - mif6table, error); 1487 #endif 1488 } 1489 else { 1490 #ifdef MULTICAST_PMTUD 1491 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1492 return; 1493 #else 1494 #ifdef MRT6DEBUG 1495 if (mrt6debug & DEBUG_DEBUG_XMIT) 1496 log(LOG_DEBUG, 1497 "phyint_send: packet too big on %s o %s g %s" 1498 " size %d(discarded)\n", 1499 ifp->if_xname, 1500 ip6_sprintf(&ip6->ip6_src), 1501 ip6_sprintf(&ip6->ip6_dst), 1502 mb_copy->m_pkthdr.len); 1503 #endif /* MRT6DEBUG */ 1504 m_freem(mb_copy); /* simply discard the packet */ 1505 return; 1506 #endif 1507 } 1508 } 1509 1510 static int 1511 register_send(ip6, mif, m) 1512 struct ip6_hdr *ip6; 1513 struct mif6 *mif; 1514 struct mbuf *m; 1515 { 1516 struct mbuf *mm; 1517 int i, len = m->m_pkthdr.len; 1518 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1519 struct mrt6msg *im6; 1520 1521 #ifdef MRT6DEBUG 1522 if (mrt6debug) 1523 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1524 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1525 #endif 1526 ++pim6stat.pim6s_snd_registers; 1527 1528 /* Make a copy of the packet to send to the user level process */ 1529 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1530 if (mm == NULL) 1531 return ENOBUFS; 1532 mm->m_data += max_linkhdr; 1533 mm->m_len = sizeof(struct ip6_hdr); 1534 1535 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1536 m_freem(mm); 1537 return ENOBUFS; 1538 } 1539 i = MHLEN - M_LEADINGSPACE(mm); 1540 if (i > len) 1541 i = len; 1542 mm = m_pullup(mm, i); 1543 if (mm == NULL){ 1544 m_freem(mm); 1545 return ENOBUFS; 1546 } 1547 /* TODO: check it! */ 1548 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1549 1550 /* 1551 * Send message to routing daemon 1552 */ 1553 sin6.sin6_addr = ip6->ip6_src; 1554 1555 im6 = mtod(mm, struct mrt6msg *); 1556 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1557 im6->im6_mbz = 0; 1558 1559 im6->im6_mif = mif - mif6table; 1560 1561 /* iif info is not given for reg. encap.n */ 1562 mrt6stat.mrt6s_upcalls++; 1563 1564 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1565 #ifdef MRT6DEBUG 1566 if (mrt6debug) 1567 log(LOG_WARNING, 1568 "register_send: ip_mrouter socket queue full\n"); 1569 #endif 1570 ++mrt6stat.mrt6s_upq_sockfull; 1571 return ENOBUFS; 1572 } 1573 return 0; 1574 } 1575 1576 /* 1577 * PIM sparse mode hook 1578 * Receives the pim control messages, and passes them up to the listening 1579 * socket, using rip6_input. 1580 * The only message processed is the REGISTER pim message; the pim header 1581 * is stripped off, and the inner packet is passed to register_mforward. 1582 */ 1583 int 1584 pim6_input(mp, offp, proto) 1585 struct mbuf **mp; 1586 int *offp, proto; 1587 { 1588 struct pim *pim; /* pointer to a pim struct */ 1589 struct ip6_hdr *ip6; 1590 int pimlen; 1591 struct mbuf *m = *mp; 1592 int minlen; 1593 int off = *offp; 1594 1595 ++pim6stat.pim6s_rcv_total; 1596 1597 ip6 = mtod(m, struct ip6_hdr *); 1598 pimlen = m->m_pkthdr.len - *offp; 1599 1600 /* 1601 * Validate lengths 1602 */ 1603 if (pimlen < PIM_MINLEN) { 1604 ++pim6stat.pim6s_rcv_tooshort; 1605 #ifdef MRT6DEBUG 1606 if (mrt6debug & DEBUG_PIM) 1607 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1608 #endif 1609 m_freem(m); 1610 return(IPPROTO_DONE); 1611 } 1612 1613 /* 1614 * if the packet is at least as big as a REGISTER, go ahead 1615 * and grab the PIM REGISTER header size, to avoid another 1616 * possible m_pullup() later. 1617 * 1618 * PIM_MINLEN == pimhdr + u_int32 == 8 1619 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1620 */ 1621 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1622 1623 /* 1624 * Make sure that the IP6 and PIM headers in contiguous memory, and 1625 * possibly the PIM REGISTER header 1626 */ 1627 #ifndef PULLDOWN_TEST 1628 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1629 /* adjust pointer */ 1630 ip6 = mtod(m, struct ip6_hdr *); 1631 1632 /* adjust mbuf to point to the PIM header */ 1633 pim = (struct pim *)((caddr_t)ip6 + off); 1634 #else 1635 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1636 if (pim == NULL) { 1637 pim6stat.pim6s_rcv_tooshort++; 1638 return IPPROTO_DONE; 1639 } 1640 #endif 1641 1642 #define PIM6_CHECKSUM 1643 #ifdef PIM6_CHECKSUM 1644 { 1645 int cksumlen; 1646 1647 /* 1648 * Validate checksum. 1649 * If PIM REGISTER, exclude the data packet 1650 */ 1651 if (pim->pim_type == PIM_REGISTER) 1652 cksumlen = PIM_MINLEN; 1653 else 1654 cksumlen = pimlen; 1655 1656 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1657 ++pim6stat.pim6s_rcv_badsum; 1658 #ifdef MRT6DEBUG 1659 if (mrt6debug & DEBUG_PIM) 1660 log(LOG_DEBUG, 1661 "pim6_input: invalid checksum\n"); 1662 #endif 1663 m_freem(m); 1664 return(IPPROTO_DONE); 1665 } 1666 } 1667 #endif /* PIM_CHECKSUM */ 1668 1669 /* PIM version check */ 1670 if (pim->pim_ver != PIM_VERSION) { 1671 ++pim6stat.pim6s_rcv_badversion; 1672 #ifdef MRT6DEBUG 1673 log(LOG_ERR, 1674 "pim6_input: incorrect version %d, expecting %d\n", 1675 pim->pim_ver, PIM_VERSION); 1676 #endif 1677 m_freem(m); 1678 return(IPPROTO_DONE); 1679 } 1680 1681 if (pim->pim_type == PIM_REGISTER) { 1682 /* 1683 * since this is a REGISTER, we'll make a copy of the register 1684 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1685 * routing daemon. 1686 */ 1687 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1688 1689 struct mbuf *mcp; 1690 struct ip6_hdr *eip6; 1691 u_int32_t *reghdr; 1692 int rc; 1693 1694 ++pim6stat.pim6s_rcv_registers; 1695 1696 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1697 #ifdef MRT6DEBUG 1698 if (mrt6debug & DEBUG_PIM) 1699 log(LOG_DEBUG, 1700 "pim6_input: register mif not set: %d\n", 1701 reg_mif_num); 1702 #endif 1703 m_freem(m); 1704 return(IPPROTO_DONE); 1705 } 1706 1707 reghdr = (u_int32_t *)(pim + 1); 1708 1709 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1710 goto pim6_input_to_daemon; 1711 1712 /* 1713 * Validate length 1714 */ 1715 if (pimlen < PIM6_REG_MINLEN) { 1716 ++pim6stat.pim6s_rcv_tooshort; 1717 ++pim6stat.pim6s_rcv_badregisters; 1718 #ifdef MRT6DEBUG 1719 log(LOG_ERR, 1720 "pim6_input: register packet size too " 1721 "small %d from %s\n", 1722 pimlen, ip6_sprintf(&ip6->ip6_src)); 1723 #endif 1724 m_freem(m); 1725 return(IPPROTO_DONE); 1726 } 1727 1728 eip6 = (struct ip6_hdr *) (reghdr + 1); 1729 #ifdef MRT6DEBUG 1730 if (mrt6debug & DEBUG_PIM) 1731 log(LOG_DEBUG, 1732 "pim6_input[register], eip6: %s -> %s, " 1733 "eip6 plen %d\n", 1734 ip6_sprintf(&eip6->ip6_src), 1735 ip6_sprintf(&eip6->ip6_dst), 1736 ntohs(eip6->ip6_plen)); 1737 #endif 1738 1739 /* verify the version number of the inner packet */ 1740 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1741 ++pim6stat.pim6s_rcv_badregisters; 1742 #ifdef MRT6DEBUG 1743 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1744 "of the inner packet\n", 1745 (eip6->ip6_vfc & IPV6_VERSION)); 1746 #endif 1747 m_freem(m); 1748 return(IPPROTO_NONE); 1749 } 1750 1751 /* verify the inner packet is destined to a mcast group */ 1752 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1753 ++pim6stat.pim6s_rcv_badregisters; 1754 #ifdef MRT6DEBUG 1755 if (mrt6debug & DEBUG_PIM) 1756 log(LOG_DEBUG, 1757 "pim6_input: inner packet of register " 1758 "is not multicast %s\n", 1759 ip6_sprintf(&eip6->ip6_dst)); 1760 #endif 1761 m_freem(m); 1762 return(IPPROTO_DONE); 1763 } 1764 1765 /* 1766 * make a copy of the whole header to pass to the daemon later. 1767 */ 1768 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1769 if (mcp == NULL) { 1770 #ifdef MRT6DEBUG 1771 log(LOG_ERR, 1772 "pim6_input: pim register: " 1773 "could not copy register head\n"); 1774 #endif 1775 m_freem(m); 1776 return(IPPROTO_DONE); 1777 } 1778 1779 /* 1780 * forward the inner ip6 packet; point m_data at the inner ip6. 1781 */ 1782 m_adj(m, off + PIM_MINLEN); 1783 #ifdef MRT6DEBUG 1784 if (mrt6debug & DEBUG_PIM) { 1785 log(LOG_DEBUG, 1786 "pim6_input: forwarding decapsulated register: " 1787 "src %s, dst %s, mif %d\n", 1788 ip6_sprintf(&eip6->ip6_src), 1789 ip6_sprintf(&eip6->ip6_dst), 1790 reg_mif_num); 1791 } 1792 #endif 1793 1794 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1795 (struct sockaddr *) &dst, 1796 (struct rtentry *) NULL); 1797 1798 /* prepare the register head to send to the mrouting daemon */ 1799 m = mcp; 1800 } 1801 1802 /* 1803 * Pass the PIM message up to the daemon; if it is a register message 1804 * pass the 'head' only up to the daemon. This includes the 1805 * encapsulator ip6 header, pim header, register header and the 1806 * encapsulated ip6 header. 1807 */ 1808 pim6_input_to_daemon: 1809 rip6_input(&m, offp, proto); 1810 return(IPPROTO_DONE); 1811 } 1812
Indexes created Tue Sep 23 22:09:46 GMT 2025