ip6_mroute.c revision 1.29
1 /* $NetBSD: ip6_mroute.c,v 1.29 2002/05/29 07:53:41 itojun Exp $ */ 2 /* $KAME: ip6_mroute.c,v 1.49 2001/07/25 09:21:18 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ 34 35 /* 36 * IP multicast forwarding procedures 37 * 38 * Written by David Waitzman, BBN Labs, August 1988. 39 * Modified by Steve Deering, Stanford, February 1989. 40 * Modified by Mark J. Steiglitz, Stanford, May, 1991 41 * Modified by Van Jacobson, LBL, January 1993 42 * Modified by Ajit Thyagarajan, PARC, August 1993 43 * Modified by Bill Fenenr, PARC, April 1994 44 * 45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 46 */ 47 48 #include <sys/cdefs.h> 49 __KERNEL_RCSID(0, "$NetBSD: ip6_mroute.c,v 1.29 2002/05/29 07:53:41 itojun Exp $"); 50 51 #include "opt_inet.h" 52 53 #ifndef _KERNEL 54 # ifdef KERNEL 55 # define _KERNEL 56 # endif 57 #endif 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/callout.h> 62 #include <sys/mbuf.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/sockio.h> 66 #include <sys/protosw.h> 67 #include <sys/errno.h> 68 #include <sys/time.h> 69 #include <sys/kernel.h> 70 #include <sys/ioctl.h> 71 #include <sys/syslog.h> 72 73 #include <net/if.h> 74 #include <net/route.h> 75 #include <net/raw_cb.h> 76 77 #include <netinet/in.h> 78 #include <netinet/in_var.h> 79 80 #include <netinet/ip6.h> 81 #include <netinet6/ip6_var.h> 82 #include <netinet6/ip6_mroute.h> 83 #include <netinet6/pim6.h> 84 #include <netinet6/pim6_var.h> 85 #include <netinet6/nd6.h> 86 87 #include <net/net_osdep.h> 88 89 #define M_HASCL(m) ((m)->m_flags & M_EXT) 90 91 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 92 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 93 94 static int set_pim6 __P((int *)); 95 static int get_pim6 __P((struct mbuf *)); 96 static int socket_send __P((struct socket *, struct mbuf *, 97 struct sockaddr_in6 *)); 98 static int register_send __P((struct ip6_hdr *, struct mif6 *, 99 struct mbuf *)); 100 101 /* 102 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 103 * except for netstat or debugging purposes. 104 */ 105 struct socket *ip6_mrouter = NULL; 106 int ip6_mrouter_ver = 0; 107 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 108 struct mrt6stat mrt6stat; 109 110 #define NO_RTE_FOUND 0x1 111 #define RTE_FOUND 0x2 112 113 struct mf6c *mf6ctable[MF6CTBLSIZ]; 114 u_char nexpire6[MF6CTBLSIZ]; 115 static struct mif6 mif6table[MAXMIFS]; 116 #ifdef MRT6DEBUG 117 u_int mrt6debug = 0; /* debug level */ 118 #define DEBUG_MFC 0x02 119 #define DEBUG_FORWARD 0x04 120 #define DEBUG_EXPIRE 0x08 121 #define DEBUG_XMIT 0x10 122 #define DEBUG_REG 0x20 123 #define DEBUG_PIM 0x40 124 #endif 125 126 static void expire_upcalls __P((void *)); 127 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 128 #define UPCALL_EXPIRE 6 /* number of timeouts */ 129 130 #ifdef INET 131 #ifdef MROUTING 132 extern struct socket *ip_mrouter; 133 #endif 134 #endif 135 136 /* 137 * 'Interfaces' associated with decapsulator (so we can tell 138 * packets that went through it from ones that get reflected 139 * by a broken gateway). These interfaces are never linked into 140 * the system ifnet list & no routes point to them. I.e., packets 141 * can't be sent this way. They only exist as a placeholder for 142 * multicast source verification. 143 */ 144 struct ifnet multicast_register_if; 145 146 #define ENCAP_HOPS 64 147 148 /* 149 * Private variables. 150 */ 151 static mifi_t nummifs = 0; 152 static mifi_t reg_mif_num = (mifi_t)-1; 153 154 static struct pim6stat pim6stat; 155 static int pim6; 156 157 /* 158 * Hash function for a source, group entry 159 */ 160 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 161 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 162 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 163 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 164 165 /* 166 * Find a route for a given origin IPv6 address and Multicast group address. 167 * Quality of service parameter to be added in the future!!! 168 */ 169 170 #define MF6CFIND(o, g, rt) do { \ 171 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 172 rt = NULL; \ 173 mrt6stat.mrt6s_mfc_lookups++; \ 174 while (_rt) { \ 175 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 176 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 177 (_rt->mf6c_stall == NULL)) { \ 178 rt = _rt; \ 179 break; \ 180 } \ 181 _rt = _rt->mf6c_next; \ 182 } \ 183 if (rt == NULL) { \ 184 mrt6stat.mrt6s_mfc_misses++; \ 185 } \ 186 } while (0) 187 188 /* 189 * Macros to compute elapsed time efficiently 190 * Borrowed from Van Jacobson's scheduling code 191 */ 192 #define TV_DELTA(a, b, delta) do { \ 193 int xxs; \ 194 \ 195 delta = (a).tv_usec - (b).tv_usec; \ 196 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 197 switch (xxs) { \ 198 case 2: \ 199 delta += 1000000; \ 200 /* fall through */ \ 201 case 1: \ 202 delta += 1000000; \ 203 break; \ 204 default: \ 205 delta += (1000000 * xxs); \ 206 } \ 207 } \ 208 } while (0) 209 210 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 211 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 212 213 #ifdef UPCALL_TIMING 214 #define UPCALL_MAX 50 215 u_long upcall_data[UPCALL_MAX + 1]; 216 static void collate(); 217 #endif /* UPCALL_TIMING */ 218 219 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 220 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 221 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 222 static int add_m6if __P((struct mif6ctl *)); 223 static int del_m6if __P((mifi_t *)); 224 static int add_m6fc __P((struct mf6cctl *)); 225 static int del_m6fc __P((struct mf6cctl *)); 226 227 static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER; 228 229 /* 230 * Handle MRT setsockopt commands to modify the multicast routing tables. 231 */ 232 int 233 ip6_mrouter_set(cmd, so, m) 234 int cmd; 235 struct socket *so; 236 struct mbuf *m; 237 { 238 if (cmd != MRT6_INIT && so != ip6_mrouter) 239 return EACCES; 240 241 switch (cmd) { 242 case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd); 243 case MRT6_INIT: return ip6_mrouter_init(so, m, cmd); 244 case MRT6_DONE: return ip6_mrouter_done(); 245 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 246 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 247 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 248 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 249 case MRT6_PIM: return set_pim6(mtod(m, int *)); 250 default: return EOPNOTSUPP; 251 } 252 } 253 254 /* 255 * Handle MRT getsockopt commands 256 */ 257 int 258 ip6_mrouter_get(cmd, so, m) 259 int cmd; 260 struct socket *so; 261 struct mbuf **m; 262 { 263 struct mbuf *mb; 264 265 if (so != ip6_mrouter) return EACCES; 266 267 *m = mb = m_get(M_WAIT, MT_SOOPTS); 268 269 switch (cmd) { 270 case MRT6_PIM: 271 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)nexpire6, sizeof(nexpire6)); 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 /* 546 * XXX: some OSes can remove ifp and clear ifindex2ifnet[id] 547 * even for id between 0 and if_index. 548 */ 549 if ((ifp = ifindex2ifnet[mifcp->mif6c_pifi]) == NULL) 550 return ENXIO; 551 552 if (mifcp->mif6c_flags & MIFF_REGISTER) { 553 if (reg_mif_num == (mifi_t)-1) { 554 strcpy(multicast_register_if.if_xname, 555 "register_mif"); /* XXX */ 556 multicast_register_if.if_flags |= IFF_LOOPBACK; 557 multicast_register_if.if_index = mifcp->mif6c_mifi; 558 reg_mif_num = mifcp->mif6c_mifi; 559 } 560 561 ifp = &multicast_register_if; 562 563 } /* if REGISTER */ 564 else { 565 /* Make sure the interface supports multicast */ 566 if ((ifp->if_flags & IFF_MULTICAST) == 0) 567 return EOPNOTSUPP; 568 569 s = splsoftnet(); 570 /* 571 * Enable promiscuous reception of all IPv6 multicasts 572 * from the interface. 573 */ 574 ifr.ifr_addr.sin6_family = AF_INET6; 575 ifr.ifr_addr.sin6_addr = in6addr_any; 576 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 577 splx(s); 578 if (error) 579 return error; 580 } 581 582 s = splsoftnet(); 583 mifp->m6_flags = mifcp->mif6c_flags; 584 mifp->m6_ifp = ifp; 585 #ifdef notyet 586 /* scaling up here allows division by 1024 in critical code */ 587 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 588 #endif 589 /* initialize per mif pkt counters */ 590 mifp->m6_pkt_in = 0; 591 mifp->m6_pkt_out = 0; 592 mifp->m6_bytes_in = 0; 593 mifp->m6_bytes_out = 0; 594 splx(s); 595 596 /* Adjust nummifs up if the mifi is higher than nummifs */ 597 if (nummifs <= mifcp->mif6c_mifi) 598 nummifs = mifcp->mif6c_mifi + 1; 599 600 #ifdef MRT6DEBUG 601 if (mrt6debug) 602 log(LOG_DEBUG, 603 "add_mif #%d, phyint %s%d\n", 604 mifcp->mif6c_mifi, 605 ifp->if_name, ifp->if_unit); 606 #endif 607 608 return 0; 609 } 610 611 /* 612 * Delete a mif from the mif table 613 */ 614 static int 615 del_m6if(mifip) 616 mifi_t *mifip; 617 { 618 struct mif6 *mifp = mif6table + *mifip; 619 mifi_t mifi; 620 struct ifnet *ifp; 621 struct in6_ifreq ifr; 622 int s; 623 624 if (*mifip >= nummifs) 625 return EINVAL; 626 if (mifp->m6_ifp == NULL) 627 return EINVAL; 628 629 s = splsoftnet(); 630 631 if (!(mifp->m6_flags & MIFF_REGISTER)) { 632 /* 633 * XXX: what if there is yet IPv4 multicast daemon 634 * using the interface? 635 */ 636 ifp = mifp->m6_ifp; 637 638 ifr.ifr_addr.sin6_family = AF_INET6; 639 ifr.ifr_addr.sin6_addr = in6addr_any; 640 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 641 } 642 643 #ifdef notyet 644 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 645 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 646 #endif 647 bzero((caddr_t)mifp, sizeof (*mifp)); 648 649 /* Adjust nummifs down */ 650 for (mifi = nummifs; mifi > 0; mifi--) 651 if (mif6table[mifi - 1].m6_ifp) 652 break; 653 nummifs = mifi; 654 655 splx(s); 656 657 #ifdef MRT6DEBUG 658 if (mrt6debug) 659 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 660 #endif 661 662 return 0; 663 } 664 665 /* 666 * Add an mfc entry 667 */ 668 static int 669 add_m6fc(mfccp) 670 struct mf6cctl *mfccp; 671 { 672 struct mf6c *rt; 673 u_long hash; 674 struct rtdetq *rte; 675 u_short nstl; 676 int s; 677 678 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 679 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 680 681 /* If an entry already exists, just update the fields */ 682 if (rt) { 683 #ifdef MRT6DEBUG 684 if (mrt6debug & DEBUG_MFC) 685 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 686 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 687 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 688 mfccp->mf6cc_parent); 689 #endif 690 691 s = splsoftnet(); 692 rt->mf6c_parent = mfccp->mf6cc_parent; 693 rt->mf6c_ifset = mfccp->mf6cc_ifset; 694 splx(s); 695 return 0; 696 } 697 698 /* 699 * Find the entry for which the upcall was made and update 700 */ 701 s = splsoftnet(); 702 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 703 mfccp->mf6cc_mcastgrp.sin6_addr); 704 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 705 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 706 &mfccp->mf6cc_origin.sin6_addr) && 707 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 708 &mfccp->mf6cc_mcastgrp.sin6_addr) && 709 (rt->mf6c_stall != NULL)) { 710 711 if (nstl++) 712 log(LOG_ERR, 713 "add_m6fc: %s o %s g %s p %x dbx %p\n", 714 "multiple kernel entries", 715 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 716 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 717 mfccp->mf6cc_parent, rt->mf6c_stall); 718 719 #ifdef MRT6DEBUG 720 if (mrt6debug & DEBUG_MFC) 721 log(LOG_DEBUG, 722 "add_m6fc o %s g %s p %x dbg %x\n", 723 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 724 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 725 mfccp->mf6cc_parent, rt->mf6c_stall); 726 #endif 727 728 rt->mf6c_origin = mfccp->mf6cc_origin; 729 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 730 rt->mf6c_parent = mfccp->mf6cc_parent; 731 rt->mf6c_ifset = mfccp->mf6cc_ifset; 732 /* initialize pkt counters per src-grp */ 733 rt->mf6c_pkt_cnt = 0; 734 rt->mf6c_byte_cnt = 0; 735 rt->mf6c_wrong_if = 0; 736 737 rt->mf6c_expire = 0; /* Don't clean this guy up */ 738 nexpire6[hash]--; 739 740 /* free packets Qed at the end of this entry */ 741 for (rte = rt->mf6c_stall; rte != NULL; ) { 742 struct rtdetq *n = rte->next; 743 ip6_mdq(rte->m, rte->ifp, rt); 744 m_freem(rte->m); 745 #ifdef UPCALL_TIMING 746 collate(&(rte->t)); 747 #endif /* UPCALL_TIMING */ 748 free(rte, M_MRTABLE); 749 rte = n; 750 } 751 rt->mf6c_stall = NULL; 752 } 753 } 754 755 /* 756 * It is possible that an entry is being inserted without an upcall 757 */ 758 if (nstl == 0) { 759 #ifdef MRT6DEBUG 760 if (mrt6debug & DEBUG_MFC) 761 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 762 hash, 763 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 764 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 765 mfccp->mf6cc_parent); 766 #endif 767 768 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 769 770 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 771 &mfccp->mf6cc_origin.sin6_addr)&& 772 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 773 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 774 775 rt->mf6c_origin = mfccp->mf6cc_origin; 776 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 777 rt->mf6c_parent = mfccp->mf6cc_parent; 778 rt->mf6c_ifset = mfccp->mf6cc_ifset; 779 /* initialize pkt counters per src-grp */ 780 rt->mf6c_pkt_cnt = 0; 781 rt->mf6c_byte_cnt = 0; 782 rt->mf6c_wrong_if = 0; 783 784 if (rt->mf6c_expire) 785 nexpire6[hash]--; 786 rt->mf6c_expire = 0; 787 } 788 } 789 if (rt == NULL) { 790 /* no upcall, so make a new entry */ 791 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 792 M_NOWAIT); 793 if (rt == NULL) { 794 splx(s); 795 return ENOBUFS; 796 } 797 798 /* insert new entry at head of hash chain */ 799 rt->mf6c_origin = mfccp->mf6cc_origin; 800 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 801 rt->mf6c_parent = mfccp->mf6cc_parent; 802 rt->mf6c_ifset = mfccp->mf6cc_ifset; 803 /* initialize pkt counters per src-grp */ 804 rt->mf6c_pkt_cnt = 0; 805 rt->mf6c_byte_cnt = 0; 806 rt->mf6c_wrong_if = 0; 807 rt->mf6c_expire = 0; 808 rt->mf6c_stall = NULL; 809 810 /* link into table */ 811 rt->mf6c_next = mf6ctable[hash]; 812 mf6ctable[hash] = rt; 813 } 814 } 815 splx(s); 816 return 0; 817 } 818 819 #ifdef UPCALL_TIMING 820 /* 821 * collect delay statistics on the upcalls 822 */ 823 static void 824 collate(t) 825 struct timeval *t; 826 { 827 u_long d; 828 struct timeval tp; 829 u_long delta; 830 831 GET_TIME(tp); 832 833 if (TV_LT(*t, tp)) 834 { 835 TV_DELTA(tp, *t, delta); 836 837 d = delta >> 10; 838 if (d > UPCALL_MAX) 839 d = UPCALL_MAX; 840 841 ++upcall_data[d]; 842 } 843 } 844 #endif /* UPCALL_TIMING */ 845 846 /* 847 * Delete an mfc entry 848 */ 849 static int 850 del_m6fc(mfccp) 851 struct mf6cctl *mfccp; 852 { 853 struct sockaddr_in6 origin; 854 struct sockaddr_in6 mcastgrp; 855 struct mf6c *rt; 856 struct mf6c **nptr; 857 u_long hash; 858 int s; 859 860 origin = mfccp->mf6cc_origin; 861 mcastgrp = mfccp->mf6cc_mcastgrp; 862 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 863 864 #ifdef MRT6DEBUG 865 if (mrt6debug & DEBUG_MFC) 866 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 867 ip6_sprintf(&origin.sin6_addr), 868 ip6_sprintf(&mcastgrp.sin6_addr)); 869 #endif 870 871 s = splsoftnet(); 872 873 nptr = &mf6ctable[hash]; 874 while ((rt = *nptr) != NULL) { 875 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 876 &rt->mf6c_origin.sin6_addr) && 877 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 878 &rt->mf6c_mcastgrp.sin6_addr) && 879 rt->mf6c_stall == NULL) 880 break; 881 882 nptr = &rt->mf6c_next; 883 } 884 if (rt == NULL) { 885 splx(s); 886 return EADDRNOTAVAIL; 887 } 888 889 *nptr = rt->mf6c_next; 890 free(rt, M_MRTABLE); 891 892 splx(s); 893 894 return 0; 895 } 896 897 static int 898 socket_send(s, mm, src) 899 struct socket *s; 900 struct mbuf *mm; 901 struct sockaddr_in6 *src; 902 { 903 if (s) { 904 if (sbappendaddr(&s->so_rcv, 905 (struct sockaddr *)src, 906 mm, (struct mbuf *)0) != 0) { 907 sorwakeup(s); 908 return 0; 909 } 910 } 911 m_freem(mm); 912 return -1; 913 } 914 915 /* 916 * IPv6 multicast forwarding function. This function assumes that the packet 917 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 918 * pointed to by "ifp", and the packet is to be relayed to other networks 919 * that have members of the packet's destination IPv6 multicast group. 920 * 921 * The packet is returned unscathed to the caller, unless it is 922 * erroneous, in which case a non-zero return value tells the caller to 923 * discard it. 924 */ 925 926 int 927 ip6_mforward(ip6, ifp, m) 928 struct ip6_hdr *ip6; 929 struct ifnet *ifp; 930 struct mbuf *m; 931 { 932 struct mf6c *rt; 933 struct mif6 *mifp; 934 struct mbuf *mm; 935 int s; 936 mifi_t mifi; 937 long time_second = time.tv_sec; 938 939 #ifdef MRT6DEBUG 940 if (mrt6debug & DEBUG_FORWARD) 941 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 942 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 943 ifp->if_index); 944 #endif 945 946 /* 947 * Don't forward a packet with Hop limit of zero or one, 948 * or a packet destined to a local-only group. 949 */ 950 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 951 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 952 return 0; 953 ip6->ip6_hlim--; 954 955 /* 956 * Source address check: do not forward packets with unspecified 957 * source. It was discussed in July 2000, on ipngwg mailing list. 958 * This is rather more serious than unicast cases, because some 959 * MLD packets can be sent with the unspecified source address 960 * (although such packets must normally set 1 to the hop limit field). 961 */ 962 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 963 ip6stat.ip6s_cantforward++; 964 if (ip6_log_time + ip6_log_interval < time_second) { 965 ip6_log_time = time_second; 966 log(LOG_DEBUG, 967 "cannot forward " 968 "from %s to %s nxt %d received on %s\n", 969 ip6_sprintf(&ip6->ip6_src), 970 ip6_sprintf(&ip6->ip6_dst), 971 ip6->ip6_nxt, 972 m->m_pkthdr.rcvif ? 973 if_name(m->m_pkthdr.rcvif) : "?"); 974 } 975 return 0; 976 } 977 978 /* 979 * Determine forwarding mifs from the forwarding cache table 980 */ 981 s = splsoftnet(); 982 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 983 984 /* Entry exists, so forward if necessary */ 985 if (rt) { 986 splx(s); 987 return (ip6_mdq(m, ifp, rt)); 988 } else { 989 /* 990 * If we don't have a route for packet's origin, 991 * Make a copy of the packet & 992 * send message to routing daemon 993 */ 994 995 struct mbuf *mb0; 996 struct rtdetq *rte; 997 u_long hash; 998 /* int i, npkts;*/ 999 #ifdef UPCALL_TIMING 1000 struct timeval tp; 1001 1002 GET_TIME(tp); 1003 #endif /* UPCALL_TIMING */ 1004 1005 mrt6stat.mrt6s_no_route++; 1006 #ifdef MRT6DEBUG 1007 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1008 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1009 ip6_sprintf(&ip6->ip6_src), 1010 ip6_sprintf(&ip6->ip6_dst)); 1011 #endif 1012 1013 /* 1014 * Allocate mbufs early so that we don't do extra work if we 1015 * are just going to fail anyway. 1016 */ 1017 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1018 M_NOWAIT); 1019 if (rte == NULL) { 1020 splx(s); 1021 return ENOBUFS; 1022 } 1023 mb0 = m_copy(m, 0, M_COPYALL); 1024 /* 1025 * Pullup packet header if needed before storing it, 1026 * as other references may modify it in the meantime. 1027 */ 1028 if (mb0 && 1029 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1030 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1031 if (mb0 == NULL) { 1032 free(rte, M_MRTABLE); 1033 splx(s); 1034 return ENOBUFS; 1035 } 1036 1037 /* is there an upcall waiting for this packet? */ 1038 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1039 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1040 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1041 &rt->mf6c_origin.sin6_addr) && 1042 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1043 &rt->mf6c_mcastgrp.sin6_addr) && 1044 (rt->mf6c_stall != NULL)) 1045 break; 1046 } 1047 1048 if (rt == NULL) { 1049 struct mrt6msg *im; 1050 struct omrt6msg *oim; 1051 1052 /* no upcall, so make a new entry */ 1053 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1054 M_NOWAIT); 1055 if (rt == NULL) { 1056 free(rte, M_MRTABLE); 1057 m_freem(mb0); 1058 splx(s); 1059 return ENOBUFS; 1060 } 1061 /* 1062 * Make a copy of the header to send to the user 1063 * level process 1064 */ 1065 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1066 1067 if (mm == NULL) { 1068 free(rte, M_MRTABLE); 1069 m_freem(mb0); 1070 free(rt, M_MRTABLE); 1071 splx(s); 1072 return ENOBUFS; 1073 } 1074 1075 /* 1076 * Send message to routing daemon 1077 */ 1078 sin6.sin6_addr = ip6->ip6_src; 1079 1080 im = NULL; 1081 oim = NULL; 1082 switch (ip6_mrouter_ver) { 1083 case MRT6_OINIT: 1084 oim = mtod(mm, struct omrt6msg *); 1085 oim->im6_msgtype = MRT6MSG_NOCACHE; 1086 oim->im6_mbz = 0; 1087 break; 1088 case MRT6_INIT: 1089 im = mtod(mm, struct mrt6msg *); 1090 im->im6_msgtype = MRT6MSG_NOCACHE; 1091 im->im6_mbz = 0; 1092 break; 1093 default: 1094 free(rte, M_MRTABLE); 1095 m_freem(mb0); 1096 free(rt, M_MRTABLE); 1097 splx(s); 1098 return EINVAL; 1099 } 1100 1101 #ifdef MRT6DEBUG 1102 if (mrt6debug & DEBUG_FORWARD) 1103 log(LOG_DEBUG, 1104 "getting the iif info in the kernel\n"); 1105 #endif 1106 1107 for (mifp = mif6table, mifi = 0; 1108 mifi < nummifs && mifp->m6_ifp != ifp; 1109 mifp++, mifi++) 1110 ; 1111 1112 switch (ip6_mrouter_ver) { 1113 case MRT6_OINIT: 1114 oim->im6_mif = mifi; 1115 break; 1116 case MRT6_INIT: 1117 im->im6_mif = mifi; 1118 break; 1119 } 1120 1121 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1122 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1123 "socket queue full\n"); 1124 mrt6stat.mrt6s_upq_sockfull++; 1125 free(rte, M_MRTABLE); 1126 m_freem(mb0); 1127 free(rt, M_MRTABLE); 1128 splx(s); 1129 return ENOBUFS; 1130 } 1131 1132 mrt6stat.mrt6s_upcalls++; 1133 1134 /* insert new entry at head of hash chain */ 1135 bzero(rt, sizeof(*rt)); 1136 rt->mf6c_origin.sin6_family = AF_INET6; 1137 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1138 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1139 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1140 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1141 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1142 rt->mf6c_expire = UPCALL_EXPIRE; 1143 nexpire6[hash]++; 1144 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1145 1146 /* link into table */ 1147 rt->mf6c_next = mf6ctable[hash]; 1148 mf6ctable[hash] = rt; 1149 /* Add this entry to the end of the queue */ 1150 rt->mf6c_stall = rte; 1151 } else { 1152 /* determine if q has overflowed */ 1153 struct rtdetq **p; 1154 int npkts = 0; 1155 1156 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1157 if (++npkts > MAX_UPQ6) { 1158 mrt6stat.mrt6s_upq_ovflw++; 1159 free(rte, M_MRTABLE); 1160 m_freem(mb0); 1161 splx(s); 1162 return 0; 1163 } 1164 1165 /* Add this entry to the end of the queue */ 1166 *p = rte; 1167 } 1168 1169 rte->next = NULL; 1170 rte->m = mb0; 1171 rte->ifp = ifp; 1172 #ifdef UPCALL_TIMING 1173 rte->t = tp; 1174 #endif /* UPCALL_TIMING */ 1175 1176 splx(s); 1177 1178 return 0; 1179 } 1180 } 1181 1182 /* 1183 * Clean up cache entries if upcalls are not serviced 1184 * Call from the Slow Timeout mechanism, every half second. 1185 */ 1186 static void 1187 expire_upcalls(unused) 1188 void *unused; 1189 { 1190 struct rtdetq *rte; 1191 struct mf6c *mfc, **nptr; 1192 int i; 1193 int s; 1194 1195 s = splsoftnet(); 1196 for (i = 0; i < MF6CTBLSIZ; i++) { 1197 if (nexpire6[i] == 0) 1198 continue; 1199 nptr = &mf6ctable[i]; 1200 while ((mfc = *nptr) != NULL) { 1201 rte = mfc->mf6c_stall; 1202 /* 1203 * Skip real cache entries 1204 * Make sure it wasn't marked to not expire (shouldn't happen) 1205 * If it expires now 1206 */ 1207 if (rte != NULL && 1208 mfc->mf6c_expire != 0 && 1209 --mfc->mf6c_expire == 0) { 1210 #ifdef MRT6DEBUG 1211 if (mrt6debug & DEBUG_EXPIRE) 1212 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1213 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1214 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1215 #endif 1216 /* 1217 * drop all the packets 1218 * free the mbuf with the pkt, if, timing info 1219 */ 1220 do { 1221 struct rtdetq *n = rte->next; 1222 m_freem(rte->m); 1223 free(rte, M_MRTABLE); 1224 rte = n; 1225 } while (rte != NULL); 1226 mrt6stat.mrt6s_cache_cleanups++; 1227 nexpire6[i]--; 1228 1229 *nptr = mfc->mf6c_next; 1230 free(mfc, M_MRTABLE); 1231 } else { 1232 nptr = &mfc->mf6c_next; 1233 } 1234 } 1235 } 1236 splx(s); 1237 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1238 expire_upcalls, NULL); 1239 } 1240 1241 /* 1242 * Packet forwarding routine once entry in the cache is made 1243 */ 1244 static int 1245 ip6_mdq(m, ifp, rt) 1246 struct mbuf *m; 1247 struct ifnet *ifp; 1248 struct mf6c *rt; 1249 { 1250 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1251 mifi_t mifi, iif; 1252 struct mif6 *mifp; 1253 int plen = m->m_pkthdr.len; 1254 1255 /* 1256 * Macro to send packet on mif. Since RSVP packets don't get counted on 1257 * input, they shouldn't get counted on output, so statistics keeping is 1258 * separate. 1259 */ 1260 1261 #define MC6_SEND(ip6, mifp, m) do { \ 1262 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1263 register_send((ip6), (mifp), (m)); \ 1264 else \ 1265 phyint_send((ip6), (mifp), (m)); \ 1266 } while (0) 1267 1268 /* 1269 * Don't forward if it didn't arrive from the parent mif 1270 * for its origin. 1271 */ 1272 mifi = rt->mf6c_parent; 1273 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1274 /* came in the wrong interface */ 1275 #ifdef MRT6DEBUG 1276 if (mrt6debug & DEBUG_FORWARD) 1277 log(LOG_DEBUG, 1278 "wrong if: ifid %d mifi %d mififid %x\n", 1279 ifp->if_index, mifi, 1280 mif6table[mifi].m6_ifp->if_index); 1281 #endif 1282 mrt6stat.mrt6s_wrong_if++; 1283 rt->mf6c_wrong_if++; 1284 /* 1285 * If we are doing PIM processing, and we are forwarding 1286 * packets on this interface, send a message to the 1287 * routing daemon. 1288 */ 1289 /* have to make sure this is a valid mif */ 1290 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1291 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1292 /* 1293 * Check the M_LOOP flag to avoid an 1294 * unnecessary PIM assert. 1295 * XXX: M_LOOP is an ad-hoc hack... 1296 */ 1297 static struct sockaddr_in6 sin6 = 1298 { sizeof(sin6), AF_INET6 }; 1299 1300 struct mbuf *mm; 1301 struct mrt6msg *im; 1302 struct omrt6msg *oim; 1303 1304 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1305 if (mm && 1306 (M_HASCL(mm) || 1307 mm->m_len < sizeof(struct ip6_hdr))) 1308 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1309 if (mm == NULL) 1310 return ENOBUFS; 1311 1312 oim = NULL; 1313 im = NULL; 1314 switch (ip6_mrouter_ver) { 1315 case MRT6_OINIT: 1316 oim = mtod(mm, struct omrt6msg *); 1317 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1318 oim->im6_mbz = 0; 1319 break; 1320 case MRT6_INIT: 1321 im = mtod(mm, struct mrt6msg *); 1322 im->im6_msgtype = MRT6MSG_WRONGMIF; 1323 im->im6_mbz = 0; 1324 break; 1325 default: 1326 m_freem(mm); 1327 return EINVAL; 1328 } 1329 1330 for (mifp = mif6table, iif = 0; 1331 iif < nummifs && mifp && 1332 mifp->m6_ifp != ifp; 1333 mifp++, iif++) 1334 ; 1335 1336 switch (ip6_mrouter_ver) { 1337 case MRT6_OINIT: 1338 oim->im6_mif = iif; 1339 sin6.sin6_addr = oim->im6_src; 1340 break; 1341 case MRT6_INIT: 1342 im->im6_mif = iif; 1343 sin6.sin6_addr = im->im6_src; 1344 break; 1345 } 1346 1347 mrt6stat.mrt6s_upcalls++; 1348 1349 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1350 #ifdef MRT6DEBUG 1351 if (mrt6debug) 1352 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1353 #endif 1354 ++mrt6stat.mrt6s_upq_sockfull; 1355 return ENOBUFS; 1356 } /* if socket Q full */ 1357 } /* if PIM */ 1358 return 0; 1359 } /* if wrong iif */ 1360 1361 /* If I sourced this packet, it counts as output, else it was input. */ 1362 if (m->m_pkthdr.rcvif == NULL) { 1363 /* XXX: is rcvif really NULL when output?? */ 1364 mif6table[mifi].m6_pkt_out++; 1365 mif6table[mifi].m6_bytes_out += plen; 1366 } else { 1367 mif6table[mifi].m6_pkt_in++; 1368 mif6table[mifi].m6_bytes_in += plen; 1369 } 1370 rt->mf6c_pkt_cnt++; 1371 rt->mf6c_byte_cnt += plen; 1372 1373 /* 1374 * For each mif, forward a copy of the packet if there are group 1375 * members downstream on the interface. 1376 */ 1377 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1378 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1379 #ifdef notyet 1380 /* 1381 * check if the outgoing packet is going to break 1382 * a scope boundary. 1383 * XXX For packets through PIM register tunnel 1384 * interface, we believe a routing daemon. 1385 */ 1386 if ((mif6table[rt->mf6c_parent].m6_flags & 1387 MIFF_REGISTER) == 0 && 1388 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1389 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1390 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1391 &ip6->ip6_dst) || 1392 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1393 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1394 &ip6->ip6_src))) { 1395 ip6stat.ip6s_badscope++; 1396 continue; 1397 } 1398 #endif 1399 1400 mifp->m6_pkt_out++; 1401 mifp->m6_bytes_out += plen; 1402 MC6_SEND(ip6, mifp, m); 1403 } 1404 return 0; 1405 } 1406 1407 static void 1408 phyint_send(ip6, mifp, m) 1409 struct ip6_hdr *ip6; 1410 struct mif6 *mifp; 1411 struct mbuf *m; 1412 { 1413 struct mbuf *mb_copy; 1414 struct ifnet *ifp = mifp->m6_ifp; 1415 int error = 0; 1416 int s = splsoftnet(); 1417 static struct route_in6 ro; 1418 struct in6_multi *in6m; 1419 struct sockaddr_in6 *dst6; 1420 u_long linkmtu; 1421 1422 /* 1423 * Make a new reference to the packet; make sure that 1424 * the IPv6 header is actually copied, not just referenced, 1425 * so that ip6_output() only scribbles on the copy. 1426 */ 1427 mb_copy = m_copy(m, 0, M_COPYALL); 1428 if (mb_copy && 1429 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1430 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1431 if (mb_copy == NULL) { 1432 splx(s); 1433 return; 1434 } 1435 /* set MCAST flag to the outgoing packet */ 1436 mb_copy->m_flags |= M_MCAST; 1437 1438 /* 1439 * If we sourced the packet, call ip6_output since we may devide 1440 * the packet into fragments when the packet is too big for the 1441 * outgoing interface. 1442 * Otherwise, we can simply send the packet to the interface 1443 * sending queue. 1444 */ 1445 if (m->m_pkthdr.rcvif == NULL) { 1446 struct ip6_moptions im6o; 1447 1448 im6o.im6o_multicast_ifp = ifp; 1449 /* XXX: ip6_output will override ip6->ip6_hlim */ 1450 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1451 im6o.im6o_multicast_loop = 1; 1452 error = ip6_output(mb_copy, NULL, &ro, 1453 IPV6_FORWARDING, &im6o, NULL); 1454 1455 #ifdef MRT6DEBUG 1456 if (mrt6debug & DEBUG_XMIT) 1457 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1458 mifp - mif6table, error); 1459 #endif 1460 splx(s); 1461 return; 1462 } 1463 1464 /* 1465 * If we belong to the destination multicast group 1466 * on the outgoing interface, loop back a copy. 1467 */ 1468 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1469 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1470 if (in6m != NULL) { 1471 dst6->sin6_len = sizeof(struct sockaddr_in6); 1472 dst6->sin6_family = AF_INET6; 1473 dst6->sin6_addr = ip6->ip6_dst; 1474 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1475 } 1476 /* 1477 * Put the packet into the sending queue of the outgoing interface 1478 * if it would fit in the MTU of the interface. 1479 */ 1480 linkmtu = IN6_LINKMTU(ifp); 1481 if (mb_copy->m_pkthdr.len < linkmtu || linkmtu < IPV6_MMTU) { 1482 dst6->sin6_len = sizeof(struct sockaddr_in6); 1483 dst6->sin6_family = AF_INET6; 1484 dst6->sin6_addr = ip6->ip6_dst; 1485 /* 1486 * We just call if_output instead of nd6_output here, since 1487 * we need no ND for a multicast forwarded packet...right? 1488 */ 1489 error = (*ifp->if_output)(ifp, mb_copy, 1490 (struct sockaddr *)&ro.ro_dst, NULL); 1491 #ifdef MRT6DEBUG 1492 if (mrt6debug & DEBUG_XMIT) 1493 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1494 mifp - mif6table, error); 1495 #endif 1496 } else { 1497 #ifdef MULTICAST_PMTUD 1498 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1499 #else 1500 #ifdef MRT6DEBUG 1501 if (mrt6debug & DEBUG_XMIT) 1502 log(LOG_DEBUG, 1503 "phyint_send: packet too big on %s o %s g %s" 1504 " size %d(discarded)\n", 1505 if_name(ifp), 1506 ip6_sprintf(&ip6->ip6_src), 1507 ip6_sprintf(&ip6->ip6_dst), 1508 mb_copy->m_pkthdr.len); 1509 #endif /* MRT6DEBUG */ 1510 m_freem(mb_copy); /* simply discard the packet */ 1511 #endif 1512 } 1513 1514 splx(s); 1515 } 1516 1517 static int 1518 register_send(ip6, mif, m) 1519 struct ip6_hdr *ip6; 1520 struct mif6 *mif; 1521 struct mbuf *m; 1522 { 1523 struct mbuf *mm; 1524 int i, len = m->m_pkthdr.len; 1525 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1526 struct mrt6msg *im6; 1527 1528 #ifdef MRT6DEBUG 1529 if (mrt6debug) 1530 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1531 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1532 #endif 1533 ++pim6stat.pim6s_snd_registers; 1534 1535 /* Make a copy of the packet to send to the user level process */ 1536 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1537 if (mm == NULL) 1538 return ENOBUFS; 1539 mm->m_data += max_linkhdr; 1540 mm->m_len = sizeof(struct ip6_hdr); 1541 1542 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1543 m_freem(mm); 1544 return ENOBUFS; 1545 } 1546 i = MHLEN - M_LEADINGSPACE(mm); 1547 if (i > len) 1548 i = len; 1549 mm = m_pullup(mm, i); 1550 if (mm == NULL) 1551 return ENOBUFS; 1552 /* TODO: check it! */ 1553 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1554 1555 /* 1556 * Send message to routing daemon 1557 */ 1558 sin6.sin6_addr = ip6->ip6_src; 1559 1560 im6 = mtod(mm, struct mrt6msg *); 1561 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1562 im6->im6_mbz = 0; 1563 1564 im6->im6_mif = mif - mif6table; 1565 1566 /* iif info is not given for reg. encap.n */ 1567 mrt6stat.mrt6s_upcalls++; 1568 1569 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1570 #ifdef MRT6DEBUG 1571 if (mrt6debug) 1572 log(LOG_WARNING, 1573 "register_send: ip_mrouter socket queue full\n"); 1574 #endif 1575 ++mrt6stat.mrt6s_upq_sockfull; 1576 return ENOBUFS; 1577 } 1578 return 0; 1579 } 1580 1581 /* 1582 * PIM sparse mode hook 1583 * Receives the pim control messages, and passes them up to the listening 1584 * socket, using rip6_input. 1585 * The only message processed is the REGISTER pim message; the pim header 1586 * is stripped off, and the inner packet is passed to register_mforward. 1587 */ 1588 int 1589 pim6_input(mp, offp, proto) 1590 struct mbuf **mp; 1591 int *offp, proto; 1592 { 1593 struct pim *pim; /* pointer to a pim struct */ 1594 struct ip6_hdr *ip6; 1595 int pimlen; 1596 struct mbuf *m = *mp; 1597 int minlen; 1598 int off = *offp; 1599 1600 ++pim6stat.pim6s_rcv_total; 1601 1602 ip6 = mtod(m, struct ip6_hdr *); 1603 pimlen = m->m_pkthdr.len - *offp; 1604 1605 /* 1606 * Validate lengths 1607 */ 1608 if (pimlen < PIM_MINLEN) { 1609 ++pim6stat.pim6s_rcv_tooshort; 1610 #ifdef MRT6DEBUG 1611 if (mrt6debug & DEBUG_PIM) 1612 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1613 #endif 1614 m_freem(m); 1615 return(IPPROTO_DONE); 1616 } 1617 1618 /* 1619 * if the packet is at least as big as a REGISTER, go ahead 1620 * and grab the PIM REGISTER header size, to avoid another 1621 * possible m_pullup() later. 1622 * 1623 * PIM_MINLEN == pimhdr + u_int32 == 8 1624 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1625 */ 1626 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1627 1628 /* 1629 * Make sure that the IP6 and PIM headers in contiguous memory, and 1630 * possibly the PIM REGISTER header 1631 */ 1632 #ifndef PULLDOWN_TEST 1633 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1634 /* adjust pointer */ 1635 ip6 = mtod(m, struct ip6_hdr *); 1636 1637 /* adjust mbuf to point to the PIM header */ 1638 pim = (struct pim *)((caddr_t)ip6 + off); 1639 #else 1640 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1641 if (pim == NULL) { 1642 pim6stat.pim6s_rcv_tooshort++; 1643 return IPPROTO_DONE; 1644 } 1645 #endif 1646 1647 #define PIM6_CHECKSUM 1648 #ifdef PIM6_CHECKSUM 1649 { 1650 int cksumlen; 1651 1652 /* 1653 * Validate checksum. 1654 * If PIM REGISTER, exclude the data packet 1655 */ 1656 if (pim->pim_type == PIM_REGISTER) 1657 cksumlen = PIM_MINLEN; 1658 else 1659 cksumlen = pimlen; 1660 1661 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1662 ++pim6stat.pim6s_rcv_badsum; 1663 #ifdef MRT6DEBUG 1664 if (mrt6debug & DEBUG_PIM) 1665 log(LOG_DEBUG, 1666 "pim6_input: invalid checksum\n"); 1667 #endif 1668 m_freem(m); 1669 return(IPPROTO_DONE); 1670 } 1671 } 1672 #endif /* PIM_CHECKSUM */ 1673 1674 /* PIM version check */ 1675 if (pim->pim_ver != PIM_VERSION) { 1676 ++pim6stat.pim6s_rcv_badversion; 1677 #ifdef MRT6DEBUG 1678 log(LOG_ERR, 1679 "pim6_input: incorrect version %d, expecting %d\n", 1680 pim->pim_ver, PIM_VERSION); 1681 #endif 1682 m_freem(m); 1683 return(IPPROTO_DONE); 1684 } 1685 1686 if (pim->pim_type == PIM_REGISTER) { 1687 /* 1688 * since this is a REGISTER, we'll make a copy of the register 1689 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1690 * routing daemon. 1691 */ 1692 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1693 1694 struct mbuf *mcp; 1695 struct ip6_hdr *eip6; 1696 u_int32_t *reghdr; 1697 int rc; 1698 1699 ++pim6stat.pim6s_rcv_registers; 1700 1701 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1702 #ifdef MRT6DEBUG 1703 if (mrt6debug & DEBUG_PIM) 1704 log(LOG_DEBUG, 1705 "pim6_input: register mif not set: %d\n", 1706 reg_mif_num); 1707 #endif 1708 m_freem(m); 1709 return(IPPROTO_DONE); 1710 } 1711 1712 reghdr = (u_int32_t *)(pim + 1); 1713 1714 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1715 goto pim6_input_to_daemon; 1716 1717 /* 1718 * Validate length 1719 */ 1720 if (pimlen < PIM6_REG_MINLEN) { 1721 ++pim6stat.pim6s_rcv_tooshort; 1722 ++pim6stat.pim6s_rcv_badregisters; 1723 #ifdef MRT6DEBUG 1724 log(LOG_ERR, 1725 "pim6_input: register packet size too " 1726 "small %d from %s\n", 1727 pimlen, ip6_sprintf(&ip6->ip6_src)); 1728 #endif 1729 m_freem(m); 1730 return(IPPROTO_DONE); 1731 } 1732 1733 eip6 = (struct ip6_hdr *) (reghdr + 1); 1734 #ifdef MRT6DEBUG 1735 if (mrt6debug & DEBUG_PIM) 1736 log(LOG_DEBUG, 1737 "pim6_input[register], eip6: %s -> %s, " 1738 "eip6 plen %d\n", 1739 ip6_sprintf(&eip6->ip6_src), 1740 ip6_sprintf(&eip6->ip6_dst), 1741 ntohs(eip6->ip6_plen)); 1742 #endif 1743 1744 /* verify the version number of the inner packet */ 1745 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1746 ++pim6stat.pim6s_rcv_badregisters; 1747 #ifdef MRT6DEBUG 1748 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1749 "of the inner packet\n", 1750 (eip6->ip6_vfc & IPV6_VERSION)); 1751 #endif 1752 m_freem(m); 1753 return(IPPROTO_NONE); 1754 } 1755 1756 /* verify the inner packet is destined to a mcast group */ 1757 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1758 ++pim6stat.pim6s_rcv_badregisters; 1759 #ifdef MRT6DEBUG 1760 if (mrt6debug & DEBUG_PIM) 1761 log(LOG_DEBUG, 1762 "pim6_input: inner packet of register " 1763 "is not multicast %s\n", 1764 ip6_sprintf(&eip6->ip6_dst)); 1765 #endif 1766 m_freem(m); 1767 return(IPPROTO_DONE); 1768 } 1769 1770 /* 1771 * make a copy of the whole header to pass to the daemon later. 1772 */ 1773 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1774 if (mcp == NULL) { 1775 #ifdef MRT6DEBUG 1776 log(LOG_ERR, 1777 "pim6_input: pim register: " 1778 "could not copy register head\n"); 1779 #endif 1780 m_freem(m); 1781 return(IPPROTO_DONE); 1782 } 1783 1784 /* 1785 * forward the inner ip6 packet; point m_data at the inner ip6. 1786 */ 1787 m_adj(m, off + PIM_MINLEN); 1788 #ifdef MRT6DEBUG 1789 if (mrt6debug & DEBUG_PIM) { 1790 log(LOG_DEBUG, 1791 "pim6_input: forwarding decapsulated register: " 1792 "src %s, dst %s, mif %d\n", 1793 ip6_sprintf(&eip6->ip6_src), 1794 ip6_sprintf(&eip6->ip6_dst), 1795 reg_mif_num); 1796 } 1797 #endif 1798 1799 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1800 (struct sockaddr *) &dst, 1801 (struct rtentry *) NULL); 1802 1803 /* prepare the register head to send to the mrouting daemon */ 1804 m = mcp; 1805 } 1806 1807 /* 1808 * Pass the PIM message up to the daemon; if it is a register message 1809 * pass the 'head' only up to the daemon. This includes the 1810 * encapsulator ip6 header, pim header, register header and the 1811 * encapsulated ip6 header. 1812 */ 1813 pim6_input_to_daemon: 1814 rip6_input(&m, offp, proto); 1815 return(IPPROTO_DONE); 1816 } 1817
Indexes created Wed Sep 24 05:09:52 GMT 2025