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sys/netinet6/ip6_mroute.c
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1 /* $FreeBSD: releng/5.1/sys/netinet6/ip6_mroute.c 111119 2003-02-19 05:47:46Z imp $ */ 2 /* $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ 34 35 /* 36 * IP multicast forwarding procedures 37 * 38 * Written by David Waitzman, BBN Labs, August 1988. 39 * Modified by Steve Deering, Stanford, February 1989. 40 * Modified by Mark J. Steiglitz, Stanford, May, 1991 41 * Modified by Van Jacobson, LBL, January 1993 42 * Modified by Ajit Thyagarajan, PARC, August 1993 43 * Modified by Bill Fenenr, PARC, April 1994 44 * 45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 46 */ 47 48 #include "opt_inet.h" 49 #include "opt_inet6.h" 50 51 #include <sys/param.h> 52 #include <sys/callout.h> 53 #include <sys/errno.h> 54 #include <sys/kernel.h> 55 #include <sys/lock.h> 56 #include <sys/malloc.h> 57 #include <sys/mbuf.h> 58 #include <sys/protosw.h> 59 #include <sys/signalvar.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/sockio.h> 63 #include <sys/sx.h> 64 #include <sys/syslog.h> 65 #include <sys/systm.h> 66 #include <sys/time.h> 67 68 #include <net/if.h> 69 #include <net/raw_cb.h> 70 #include <net/route.h> 71 72 #include <netinet/in.h> 73 #include <netinet/in_var.h> 74 75 #include <netinet/ip6.h> 76 #include <netinet6/ip6_var.h> 77 #include <netinet6/ip6_mroute.h> 78 #include <netinet6/pim6.h> 79 #include <netinet6/pim6_var.h> 80 81 #include <net/net_osdep.h> 82 83 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry"); 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 socket_send __P((struct socket *, struct mbuf *, 92 struct sockaddr_in6 *)); 93 static int register_send __P((struct ip6_hdr *, struct mif6 *, 94 struct mbuf *)); 95 96 /* 97 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 98 * except for netstat or debugging purposes. 99 */ 100 struct socket *ip6_mrouter = NULL; 101 int ip6_mrouter_ver = 0; 102 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 103 struct mrt6stat mrt6stat; 104 105 #define NO_RTE_FOUND 0x1 106 #define RTE_FOUND 0x2 107 108 struct mf6c *mf6ctable[MF6CTBLSIZ]; 109 u_char n6expire[MF6CTBLSIZ]; 110 static struct mif6 mif6table[MAXMIFS]; 111 #ifdef MRT6DEBUG 112 u_int mrt6debug = 0; /* debug level */ 113 #define DEBUG_MFC 0x02 114 #define DEBUG_FORWARD 0x04 115 #define DEBUG_EXPIRE 0x08 116 #define DEBUG_XMIT 0x10 117 #define DEBUG_REG 0x20 118 #define DEBUG_PIM 0x40 119 #endif 120 121 static void expire_upcalls __P((void *)); 122 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 123 #define UPCALL_EXPIRE 6 /* number of timeouts */ 124 125 #ifdef INET 126 #ifdef MROUTING 127 extern struct socket *ip_mrouter; 128 #endif 129 #endif 130 131 /* 132 * 'Interfaces' associated with decapsulator (so we can tell 133 * packets that went through it from ones that get reflected 134 * by a broken gateway). These interfaces are never linked into 135 * the system ifnet list & no routes point to them. I.e., packets 136 * can't be sent this way. They only exist as a placeholder for 137 * multicast source verification. 138 */ 139 struct ifnet multicast_register_if; 140 141 #define ENCAP_HOPS 64 142 143 /* 144 * Private variables. 145 */ 146 static mifi_t nummifs = 0; 147 static mifi_t reg_mif_num = (mifi_t)-1; 148 149 static struct pim6stat pim6stat; 150 static int pim6; 151 152 /* 153 * Hash function for a source, group entry 154 */ 155 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 156 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 157 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 158 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 159 160 /* 161 * Find a route for a given origin IPv6 address and Multicast group address. 162 * Quality of service parameter to be added in the future!!! 163 */ 164 165 #define MF6CFIND(o, g, rt) do { \ 166 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 167 rt = NULL; \ 168 mrt6stat.mrt6s_mfc_lookups++; \ 169 while (_rt) { \ 170 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 171 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 172 (_rt->mf6c_stall == NULL)) { \ 173 rt = _rt; \ 174 break; \ 175 } \ 176 _rt = _rt->mf6c_next; \ 177 } \ 178 if (rt == NULL) { \ 179 mrt6stat.mrt6s_mfc_misses++; \ 180 } \ 181 } while (0) 182 183 /* 184 * Macros to compute elapsed time efficiently 185 * Borrowed from Van Jacobson's scheduling code 186 */ 187 #define TV_DELTA(a, b, delta) do { \ 188 int xxs; \ 189 \ 190 delta = (a).tv_usec - (b).tv_usec; \ 191 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 192 switch (xxs) { \ 193 case 2: \ 194 delta += 1000000; \ 195 /* fall through */ \ 196 case 1: \ 197 delta += 1000000; \ 198 break; \ 199 default: \ 200 delta += (1000000 * xxs); \ 201 } \ 202 } \ 203 } while (0) 204 205 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 206 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 207 208 #ifdef UPCALL_TIMING 209 #define UPCALL_MAX 50 210 u_long upcall_data[UPCALL_MAX + 1]; 211 static void collate(); 212 #endif /* UPCALL_TIMING */ 213 214 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 215 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 216 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 217 static int add_m6if __P((struct mif6ctl *)); 218 static int del_m6if __P((mifi_t *)); 219 static int add_m6fc __P((struct mf6cctl *)); 220 static int del_m6fc __P((struct mf6cctl *)); 221 222 static struct callout expire_upcalls_ch; 223 224 /* 225 * Handle MRT setsockopt commands to modify the multicast routing tables. 226 */ 227 int 228 ip6_mrouter_set(so, sopt) 229 struct socket *so; 230 struct sockopt *sopt; 231 { 232 int error = 0; 233 struct mbuf *m; 234 235 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 236 return (EACCES); 237 238 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 239 return (error); 240 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 241 return (error); 242 243 switch (sopt->sopt_name) { 244 case MRT6_INIT: 245 #ifdef MRT6_OINIT 246 case MRT6_OINIT: 247 #endif 248 error = ip6_mrouter_init(so, m, sopt->sopt_name); 249 break; 250 case MRT6_DONE: 251 error = ip6_mrouter_done(); 252 break; 253 case MRT6_ADD_MIF: 254 error = add_m6if(mtod(m, struct mif6ctl *)); 255 break; 256 case MRT6_DEL_MIF: 257 error = del_m6if(mtod(m, mifi_t *)); 258 break; 259 case MRT6_ADD_MFC: 260 error = add_m6fc(mtod(m, struct mf6cctl *)); 261 break; 262 case MRT6_DEL_MFC: 263 error = del_m6fc(mtod(m, struct mf6cctl *)); 264 break; 265 case MRT6_PIM: 266 error = set_pim6(mtod(m, int *)); 267 break; 268 default: 269 error = EOPNOTSUPP; 270 break; 271 } 272 273 (void)m_freem(m); 274 return(error); 275 } 276 277 /* 278 * Handle MRT getsockopt commands 279 */ 280 int 281 ip6_mrouter_get(so, sopt) 282 struct socket *so; 283 struct sockopt *sopt; 284 { 285 int error = 0; 286 287 if (so != ip6_mrouter) return EACCES; 288 289 switch (sopt->sopt_name) { 290 case MRT6_PIM: 291 error = sooptcopyout(sopt, &pim6, sizeof(pim6)); 292 break; 293 } 294 return (error); 295 } 296 297 /* 298 * Handle ioctl commands to obtain information from the cache 299 */ 300 int 301 mrt6_ioctl(cmd, data) 302 int cmd; 303 caddr_t data; 304 { 305 int error = 0; 306 307 switch (cmd) { 308 case SIOCGETSGCNT_IN6: 309 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 310 break; /* for safety */ 311 case SIOCGETMIFCNT_IN6: 312 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 313 break; /* for safety */ 314 default: 315 return (EINVAL); 316 break; 317 } 318 return error; 319 } 320 321 /* 322 * returns the packet, byte, rpf-failure count for the source group provided 323 */ 324 static int 325 get_sg_cnt(req) 326 struct sioc_sg_req6 *req; 327 { 328 struct mf6c *rt; 329 int s; 330 331 s = splnet(); 332 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 333 splx(s); 334 if (rt != NULL) { 335 req->pktcnt = rt->mf6c_pkt_cnt; 336 req->bytecnt = rt->mf6c_byte_cnt; 337 req->wrong_if = rt->mf6c_wrong_if; 338 } else 339 return(ESRCH); 340 #if 0 341 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 342 #endif 343 344 return 0; 345 } 346 347 /* 348 * returns the input and output packet and byte counts on the mif provided 349 */ 350 static int 351 get_mif6_cnt(req) 352 struct sioc_mif_req6 *req; 353 { 354 mifi_t mifi = req->mifi; 355 356 if (mifi >= nummifs) 357 return EINVAL; 358 359 req->icount = mif6table[mifi].m6_pkt_in; 360 req->ocount = mif6table[mifi].m6_pkt_out; 361 req->ibytes = mif6table[mifi].m6_bytes_in; 362 req->obytes = mif6table[mifi].m6_bytes_out; 363 364 return 0; 365 } 366 367 static int 368 set_pim6(i) 369 int *i; 370 { 371 if ((*i != 1) && (*i != 0)) 372 return EINVAL; 373 374 pim6 = *i; 375 376 return 0; 377 } 378 379 /* 380 * Enable multicast routing 381 */ 382 static int 383 ip6_mrouter_init(so, m, cmd) 384 struct socket *so; 385 struct mbuf *m; 386 int cmd; 387 { 388 int *v; 389 390 #ifdef MRT6DEBUG 391 if (mrt6debug) 392 log(LOG_DEBUG, 393 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 394 so->so_type, so->so_proto->pr_protocol); 395 #endif 396 397 if (so->so_type != SOCK_RAW || 398 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 399 return EOPNOTSUPP; 400 401 if (!m || (m->m_len != sizeof(int *))) 402 return ENOPROTOOPT; 403 404 v = mtod(m, int *); 405 if (*v != 1) 406 return ENOPROTOOPT; 407 408 if (ip6_mrouter != NULL) return EADDRINUSE; 409 410 ip6_mrouter = so; 411 ip6_mrouter_ver = cmd; 412 413 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 414 bzero((caddr_t)n6expire, sizeof(n6expire)); 415 416 pim6 = 0;/* used for stubbing out/in pim stuff */ 417 418 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 419 expire_upcalls, NULL); 420 421 #ifdef MRT6DEBUG 422 if (mrt6debug) 423 log(LOG_DEBUG, "ip6_mrouter_init\n"); 424 #endif 425 426 return 0; 427 } 428 429 /* 430 * Disable multicast routing 431 */ 432 int 433 ip6_mrouter_done() 434 { 435 mifi_t mifi; 436 int i; 437 struct ifnet *ifp; 438 struct in6_ifreq ifr; 439 struct mf6c *rt; 440 struct rtdetq *rte; 441 int s; 442 443 s = splnet(); 444 445 /* 446 * For each phyint in use, disable promiscuous reception of all IPv6 447 * multicasts. 448 */ 449 #ifdef INET 450 #ifdef MROUTING 451 /* 452 * If there is still IPv4 multicast routing daemon, 453 * we remain interfaces to receive all muliticasted packets. 454 * XXX: there may be an interface in which the IPv4 multicast 455 * daemon is not interested... 456 */ 457 if (!ip_mrouter) 458 #endif 459 #endif 460 { 461 for (mifi = 0; mifi < nummifs; mifi++) { 462 if (mif6table[mifi].m6_ifp && 463 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 464 ifr.ifr_addr.sin6_family = AF_INET6; 465 ifr.ifr_addr.sin6_addr= in6addr_any; 466 ifp = mif6table[mifi].m6_ifp; 467 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 468 (caddr_t)&ifr); 469 } 470 } 471 } 472 #ifdef notyet 473 bzero((caddr_t)qtable, sizeof(qtable)); 474 bzero((caddr_t)tbftable, sizeof(tbftable)); 475 #endif 476 bzero((caddr_t)mif6table, sizeof(mif6table)); 477 nummifs = 0; 478 479 pim6 = 0; /* used to stub out/in pim specific code */ 480 481 callout_stop(&expire_upcalls_ch); 482 483 /* 484 * Free all multicast forwarding cache entries. 485 */ 486 for (i = 0; i < MF6CTBLSIZ; i++) { 487 rt = mf6ctable[i]; 488 while (rt) { 489 struct mf6c *frt; 490 491 for (rte = rt->mf6c_stall; rte != NULL; ) { 492 struct rtdetq *n = rte->next; 493 494 m_free(rte->m); 495 free(rte, M_MRTABLE); 496 rte = n; 497 } 498 frt = rt; 499 rt = rt->mf6c_next; 500 free(frt, M_MRTABLE); 501 } 502 } 503 504 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 505 506 /* 507 * Reset de-encapsulation cache 508 */ 509 reg_mif_num = -1; 510 511 ip6_mrouter = NULL; 512 ip6_mrouter_ver = 0; 513 514 splx(s); 515 516 #ifdef MRT6DEBUG 517 if (mrt6debug) 518 log(LOG_DEBUG, "ip6_mrouter_done\n"); 519 #endif 520 521 return 0; 522 } 523 524 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 525 526 /* 527 * Add a mif to the mif table 528 */ 529 static int 530 add_m6if(mifcp) 531 struct mif6ctl *mifcp; 532 { 533 struct mif6 *mifp; 534 struct ifnet *ifp; 535 int error, s; 536 #ifdef notyet 537 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 538 #endif 539 540 if (mifcp->mif6c_mifi >= MAXMIFS) 541 return EINVAL; 542 mifp = mif6table + mifcp->mif6c_mifi; 543 if (mifp->m6_ifp) 544 return EADDRINUSE; /* XXX: is it appropriate? */ 545 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 546 return ENXIO; 547 ifp = ifnet_byindex(mifcp->mif6c_pifi); 548 549 if (mifcp->mif6c_flags & MIFF_REGISTER) { 550 if (reg_mif_num == (mifi_t)-1) { 551 multicast_register_if.if_name = "register_mif"; 552 multicast_register_if.if_flags |= IFF_LOOPBACK; 553 multicast_register_if.if_index = mifcp->mif6c_mifi; 554 reg_mif_num = mifcp->mif6c_mifi; 555 } 556 557 ifp = &multicast_register_if; 558 559 } /* if REGISTER */ 560 else { 561 /* Make sure the interface supports multicast */ 562 if ((ifp->if_flags & IFF_MULTICAST) == 0) 563 return EOPNOTSUPP; 564 565 s = splnet(); 566 error = if_allmulti(ifp, 1); 567 splx(s); 568 if (error) 569 return error; 570 } 571 572 s = splnet(); 573 mifp->m6_flags = mifcp->mif6c_flags; 574 mifp->m6_ifp = ifp; 575 #ifdef notyet 576 /* scaling up here allows division by 1024 in critical code */ 577 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 578 #endif 579 /* initialize per mif pkt counters */ 580 mifp->m6_pkt_in = 0; 581 mifp->m6_pkt_out = 0; 582 mifp->m6_bytes_in = 0; 583 mifp->m6_bytes_out = 0; 584 splx(s); 585 586 /* Adjust nummifs up if the mifi is higher than nummifs */ 587 if (nummifs <= mifcp->mif6c_mifi) 588 nummifs = mifcp->mif6c_mifi + 1; 589 590 #ifdef MRT6DEBUG 591 if (mrt6debug) 592 log(LOG_DEBUG, 593 "add_mif #%d, phyint %s%d\n", 594 mifcp->mif6c_mifi, 595 ifp->if_name, ifp->if_unit); 596 #endif 597 598 return 0; 599 } 600 601 /* 602 * Delete a mif from the mif table 603 */ 604 static int 605 del_m6if(mifip) 606 mifi_t *mifip; 607 { 608 struct mif6 *mifp = mif6table + *mifip; 609 mifi_t mifi; 610 struct ifnet *ifp; 611 int s; 612 613 if (*mifip >= nummifs) 614 return EINVAL; 615 if (mifp->m6_ifp == NULL) 616 return EINVAL; 617 618 s = splnet(); 619 620 if (!(mifp->m6_flags & MIFF_REGISTER)) { 621 /* 622 * XXX: what if there is yet IPv4 multicast daemon 623 * using the interface? 624 */ 625 ifp = mifp->m6_ifp; 626 627 if_allmulti(ifp, 0); 628 } 629 630 #ifdef notyet 631 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 632 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 633 #endif 634 bzero((caddr_t)mifp, sizeof (*mifp)); 635 636 /* Adjust nummifs down */ 637 for (mifi = nummifs; mifi > 0; mifi--) 638 if (mif6table[mifi - 1].m6_ifp) 639 break; 640 nummifs = mifi; 641 642 splx(s); 643 644 #ifdef MRT6DEBUG 645 if (mrt6debug) 646 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 647 #endif 648 649 return 0; 650 } 651 652 /* 653 * Add an mfc entry 654 */ 655 static int 656 add_m6fc(mfccp) 657 struct mf6cctl *mfccp; 658 { 659 struct mf6c *rt; 660 u_long hash; 661 struct rtdetq *rte; 662 u_short nstl; 663 int s; 664 665 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 666 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 667 668 /* If an entry already exists, just update the fields */ 669 if (rt) { 670 #ifdef MRT6DEBUG 671 if (mrt6debug & DEBUG_MFC) 672 log(LOG_DEBUG, 673 "add_m6fc no upcall h %d o %s g %s p %x\n", 674 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 675 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 676 mfccp->mf6cc_parent); 677 #endif 678 679 s = splnet(); 680 rt->mf6c_parent = mfccp->mf6cc_parent; 681 rt->mf6c_ifset = mfccp->mf6cc_ifset; 682 splx(s); 683 return 0; 684 } 685 686 /* 687 * Find the entry for which the upcall was made and update 688 */ 689 s = splnet(); 690 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 691 mfccp->mf6cc_mcastgrp.sin6_addr); 692 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 693 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 694 &mfccp->mf6cc_origin.sin6_addr) && 695 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 696 &mfccp->mf6cc_mcastgrp.sin6_addr) && 697 (rt->mf6c_stall != NULL)) { 698 699 if (nstl++) 700 log(LOG_ERR, 701 "add_m6fc: %s o %s g %s p %x dbx %p\n", 702 "multiple kernel entries", 703 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 704 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 705 mfccp->mf6cc_parent, rt->mf6c_stall); 706 707 #ifdef MRT6DEBUG 708 if (mrt6debug & DEBUG_MFC) 709 log(LOG_DEBUG, 710 "add_m6fc o %s g %s p %x dbg %x\n", 711 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 712 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 713 mfccp->mf6cc_parent, rt->mf6c_stall); 714 #endif 715 716 rt->mf6c_origin = mfccp->mf6cc_origin; 717 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 718 rt->mf6c_parent = mfccp->mf6cc_parent; 719 rt->mf6c_ifset = mfccp->mf6cc_ifset; 720 /* initialize pkt counters per src-grp */ 721 rt->mf6c_pkt_cnt = 0; 722 rt->mf6c_byte_cnt = 0; 723 rt->mf6c_wrong_if = 0; 724 725 rt->mf6c_expire = 0; /* Don't clean this guy up */ 726 n6expire[hash]--; 727 728 /* free packets Qed at the end of this entry */ 729 for (rte = rt->mf6c_stall; rte != NULL; ) { 730 struct rtdetq *n = rte->next; 731 ip6_mdq(rte->m, rte->ifp, rt); 732 m_freem(rte->m); 733 #ifdef UPCALL_TIMING 734 collate(&(rte->t)); 735 #endif /* UPCALL_TIMING */ 736 free(rte, M_MRTABLE); 737 rte = n; 738 } 739 rt->mf6c_stall = NULL; 740 } 741 } 742 743 /* 744 * It is possible that an entry is being inserted without an upcall 745 */ 746 if (nstl == 0) { 747 #ifdef MRT6DEBUG 748 if (mrt6debug & DEBUG_MFC) 749 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 750 hash, 751 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 752 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 753 mfccp->mf6cc_parent); 754 #endif 755 756 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 757 758 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 759 &mfccp->mf6cc_origin.sin6_addr)&& 760 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 761 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 762 763 rt->mf6c_origin = mfccp->mf6cc_origin; 764 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 765 rt->mf6c_parent = mfccp->mf6cc_parent; 766 rt->mf6c_ifset = mfccp->mf6cc_ifset; 767 /* initialize pkt counters per src-grp */ 768 rt->mf6c_pkt_cnt = 0; 769 rt->mf6c_byte_cnt = 0; 770 rt->mf6c_wrong_if = 0; 771 772 if (rt->mf6c_expire) 773 n6expire[hash]--; 774 rt->mf6c_expire = 0; 775 } 776 } 777 if (rt == NULL) { 778 /* no upcall, so make a new entry */ 779 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 780 M_NOWAIT); 781 if (rt == NULL) { 782 splx(s); 783 return ENOBUFS; 784 } 785 786 /* insert new entry at head of hash chain */ 787 rt->mf6c_origin = mfccp->mf6cc_origin; 788 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 789 rt->mf6c_parent = mfccp->mf6cc_parent; 790 rt->mf6c_ifset = mfccp->mf6cc_ifset; 791 /* initialize pkt counters per src-grp */ 792 rt->mf6c_pkt_cnt = 0; 793 rt->mf6c_byte_cnt = 0; 794 rt->mf6c_wrong_if = 0; 795 rt->mf6c_expire = 0; 796 rt->mf6c_stall = NULL; 797 798 /* link into table */ 799 rt->mf6c_next = mf6ctable[hash]; 800 mf6ctable[hash] = rt; 801 } 802 } 803 splx(s); 804 return 0; 805 } 806 807 #ifdef UPCALL_TIMING 808 /* 809 * collect delay statistics on the upcalls 810 */ 811 static void 812 collate(t) 813 struct timeval *t; 814 { 815 u_long d; 816 struct timeval tp; 817 u_long delta; 818 819 GET_TIME(tp); 820 821 if (TV_LT(*t, tp)) 822 { 823 TV_DELTA(tp, *t, delta); 824 825 d = delta >> 10; 826 if (d > UPCALL_MAX) 827 d = UPCALL_MAX; 828 829 ++upcall_data[d]; 830 } 831 } 832 #endif /* UPCALL_TIMING */ 833 834 /* 835 * Delete an mfc entry 836 */ 837 static int 838 del_m6fc(mfccp) 839 struct mf6cctl *mfccp; 840 { 841 struct sockaddr_in6 origin; 842 struct sockaddr_in6 mcastgrp; 843 struct mf6c *rt; 844 struct mf6c **nptr; 845 u_long hash; 846 int s; 847 848 origin = mfccp->mf6cc_origin; 849 mcastgrp = mfccp->mf6cc_mcastgrp; 850 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 851 852 #ifdef MRT6DEBUG 853 if (mrt6debug & DEBUG_MFC) 854 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 855 ip6_sprintf(&origin.sin6_addr), 856 ip6_sprintf(&mcastgrp.sin6_addr)); 857 #endif 858 859 s = splnet(); 860 861 nptr = &mf6ctable[hash]; 862 while ((rt = *nptr) != NULL) { 863 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 864 &rt->mf6c_origin.sin6_addr) && 865 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 866 &rt->mf6c_mcastgrp.sin6_addr) && 867 rt->mf6c_stall == NULL) 868 break; 869 870 nptr = &rt->mf6c_next; 871 } 872 if (rt == NULL) { 873 splx(s); 874 return EADDRNOTAVAIL; 875 } 876 877 *nptr = rt->mf6c_next; 878 free(rt, M_MRTABLE); 879 880 splx(s); 881 882 return 0; 883 } 884 885 static int 886 socket_send(s, mm, src) 887 struct socket *s; 888 struct mbuf *mm; 889 struct sockaddr_in6 *src; 890 { 891 if (s) { 892 if (sbappendaddr(&s->so_rcv, 893 (struct sockaddr *)src, 894 mm, (struct mbuf *)0) != 0) { 895 sorwakeup(s); 896 return 0; 897 } 898 } 899 m_freem(mm); 900 return -1; 901 } 902 903 /* 904 * IPv6 multicast forwarding function. This function assumes that the packet 905 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 906 * pointed to by "ifp", and the packet is to be relayed to other networks 907 * that have members of the packet's destination IPv6 multicast group. 908 * 909 * The packet is returned unscathed to the caller, unless it is 910 * erroneous, in which case a non-zero return value tells the caller to 911 * discard it. 912 */ 913 914 int 915 ip6_mforward(ip6, ifp, m) 916 struct ip6_hdr *ip6; 917 struct ifnet *ifp; 918 struct mbuf *m; 919 { 920 struct mf6c *rt; 921 struct mif6 *mifp; 922 struct mbuf *mm; 923 int s; 924 mifi_t mifi; 925 926 #ifdef MRT6DEBUG 927 if (mrt6debug & DEBUG_FORWARD) 928 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 929 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 930 ifp->if_index); 931 #endif 932 933 /* 934 * Don't forward a packet with Hop limit of zero or one, 935 * or a packet destined to a local-only group. 936 */ 937 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 938 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 939 return 0; 940 ip6->ip6_hlim--; 941 942 /* 943 * Source address check: do not forward packets with unspecified 944 * source. It was discussed in July 2000, on ipngwg mailing list. 945 * This is rather more serious than unicast cases, because some 946 * MLD packets can be sent with the unspecified source address 947 * (although such packets must normally set 1 to the hop limit field). 948 */ 949 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 950 ip6stat.ip6s_cantforward++; 951 if (ip6_log_time + ip6_log_interval < time_second) { 952 ip6_log_time = time_second; 953 log(LOG_DEBUG, 954 "cannot forward " 955 "from %s to %s nxt %d received on %s\n", 956 ip6_sprintf(&ip6->ip6_src), 957 ip6_sprintf(&ip6->ip6_dst), 958 ip6->ip6_nxt, 959 if_name(m->m_pkthdr.rcvif)); 960 } 961 return 0; 962 } 963 964 /* 965 * Determine forwarding mifs from the forwarding cache table 966 */ 967 s = splnet(); 968 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 969 970 /* Entry exists, so forward if necessary */ 971 if (rt) { 972 splx(s); 973 return (ip6_mdq(m, ifp, rt)); 974 } else { 975 /* 976 * If we don't have a route for packet's origin, 977 * Make a copy of the packet & 978 * send message to routing daemon 979 */ 980 981 struct mbuf *mb0; 982 struct rtdetq *rte; 983 u_long hash; 984 /* int i, npkts;*/ 985 #ifdef UPCALL_TIMING 986 struct timeval tp; 987 988 GET_TIME(tp); 989 #endif /* UPCALL_TIMING */ 990 991 mrt6stat.mrt6s_no_route++; 992 #ifdef MRT6DEBUG 993 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 994 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 995 ip6_sprintf(&ip6->ip6_src), 996 ip6_sprintf(&ip6->ip6_dst)); 997 #endif 998 999 /* 1000 * Allocate mbufs early so that we don't do extra work if we 1001 * are just going to fail anyway. 1002 */ 1003 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1004 M_NOWAIT); 1005 if (rte == NULL) { 1006 splx(s); 1007 return ENOBUFS; 1008 } 1009 mb0 = m_copy(m, 0, M_COPYALL); 1010 /* 1011 * Pullup packet header if needed before storing it, 1012 * as other references may modify it in the meantime. 1013 */ 1014 if (mb0 && 1015 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1016 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1017 if (mb0 == NULL) { 1018 free(rte, M_MRTABLE); 1019 splx(s); 1020 return ENOBUFS; 1021 } 1022 1023 /* is there an upcall waiting for this packet? */ 1024 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1025 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1026 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1027 &rt->mf6c_origin.sin6_addr) && 1028 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1029 &rt->mf6c_mcastgrp.sin6_addr) && 1030 (rt->mf6c_stall != NULL)) 1031 break; 1032 } 1033 1034 if (rt == NULL) { 1035 struct mrt6msg *im; 1036 #ifdef MRT6_OINIT 1037 struct omrt6msg *oim; 1038 #endif 1039 1040 /* no upcall, so make a new entry */ 1041 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1042 M_NOWAIT); 1043 if (rt == NULL) { 1044 free(rte, M_MRTABLE); 1045 m_freem(mb0); 1046 splx(s); 1047 return ENOBUFS; 1048 } 1049 /* 1050 * Make a copy of the header to send to the user 1051 * level process 1052 */ 1053 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1054 1055 if (mm == NULL) { 1056 free(rte, M_MRTABLE); 1057 m_freem(mb0); 1058 free(rt, M_MRTABLE); 1059 splx(s); 1060 return ENOBUFS; 1061 } 1062 1063 /* 1064 * Send message to routing daemon 1065 */ 1066 sin6.sin6_addr = ip6->ip6_src; 1067 1068 im = NULL; 1069 #ifdef MRT6_OINIT 1070 oim = NULL; 1071 #endif 1072 switch (ip6_mrouter_ver) { 1073 #ifdef MRT6_OINIT 1074 case MRT6_OINIT: 1075 oim = mtod(mm, struct omrt6msg *); 1076 oim->im6_msgtype = MRT6MSG_NOCACHE; 1077 oim->im6_mbz = 0; 1078 break; 1079 #endif 1080 case MRT6_INIT: 1081 im = mtod(mm, struct mrt6msg *); 1082 im->im6_msgtype = MRT6MSG_NOCACHE; 1083 im->im6_mbz = 0; 1084 break; 1085 default: 1086 free(rte, M_MRTABLE); 1087 m_freem(mb0); 1088 free(rt, M_MRTABLE); 1089 splx(s); 1090 return EINVAL; 1091 } 1092 1093 #ifdef MRT6DEBUG 1094 if (mrt6debug & DEBUG_FORWARD) 1095 log(LOG_DEBUG, 1096 "getting the iif info in the kernel\n"); 1097 #endif 1098 1099 for (mifp = mif6table, mifi = 0; 1100 mifi < nummifs && mifp->m6_ifp != ifp; 1101 mifp++, mifi++) 1102 ; 1103 1104 switch (ip6_mrouter_ver) { 1105 #ifdef MRT6_OINIT 1106 case MRT6_OINIT: 1107 oim->im6_mif = mifi; 1108 break; 1109 #endif 1110 case MRT6_INIT: 1111 im->im6_mif = mifi; 1112 break; 1113 } 1114 1115 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1116 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1117 "socket queue full\n"); 1118 mrt6stat.mrt6s_upq_sockfull++; 1119 free(rte, M_MRTABLE); 1120 m_freem(mb0); 1121 free(rt, M_MRTABLE); 1122 splx(s); 1123 return ENOBUFS; 1124 } 1125 1126 mrt6stat.mrt6s_upcalls++; 1127 1128 /* insert new entry at head of hash chain */ 1129 bzero(rt, sizeof(*rt)); 1130 rt->mf6c_origin.sin6_family = AF_INET6; 1131 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1132 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1133 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1134 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1135 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1136 rt->mf6c_expire = UPCALL_EXPIRE; 1137 n6expire[hash]++; 1138 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1139 1140 /* link into table */ 1141 rt->mf6c_next = mf6ctable[hash]; 1142 mf6ctable[hash] = rt; 1143 /* Add this entry to the end of the queue */ 1144 rt->mf6c_stall = rte; 1145 } else { 1146 /* determine if q has overflowed */ 1147 struct rtdetq **p; 1148 int npkts = 0; 1149 1150 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1151 if (++npkts > MAX_UPQ6) { 1152 mrt6stat.mrt6s_upq_ovflw++; 1153 free(rte, M_MRTABLE); 1154 m_freem(mb0); 1155 splx(s); 1156 return 0; 1157 } 1158 1159 /* Add this entry to the end of the queue */ 1160 *p = rte; 1161 } 1162 1163 rte->next = NULL; 1164 rte->m = mb0; 1165 rte->ifp = ifp; 1166 #ifdef UPCALL_TIMING 1167 rte->t = tp; 1168 #endif /* UPCALL_TIMING */ 1169 1170 splx(s); 1171 1172 return 0; 1173 } 1174 } 1175 1176 /* 1177 * Clean up cache entries if upcalls are not serviced 1178 * Call from the Slow Timeout mechanism, every half second. 1179 */ 1180 static void 1181 expire_upcalls(unused) 1182 void *unused; 1183 { 1184 struct rtdetq *rte; 1185 struct mf6c *mfc, **nptr; 1186 int i; 1187 int s; 1188 1189 s = splnet(); 1190 for (i = 0; i < MF6CTBLSIZ; i++) { 1191 if (n6expire[i] == 0) 1192 continue; 1193 nptr = &mf6ctable[i]; 1194 while ((mfc = *nptr) != NULL) { 1195 rte = mfc->mf6c_stall; 1196 /* 1197 * Skip real cache entries 1198 * Make sure it wasn't marked to not expire (shouldn't happen) 1199 * If it expires now 1200 */ 1201 if (rte != NULL && 1202 mfc->mf6c_expire != 0 && 1203 --mfc->mf6c_expire == 0) { 1204 #ifdef MRT6DEBUG 1205 if (mrt6debug & DEBUG_EXPIRE) 1206 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1207 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1208 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1209 #endif 1210 /* 1211 * drop all the packets 1212 * free the mbuf with the pkt, if, timing info 1213 */ 1214 do { 1215 struct rtdetq *n = rte->next; 1216 m_freem(rte->m); 1217 free(rte, M_MRTABLE); 1218 rte = n; 1219 } while (rte != NULL); 1220 mrt6stat.mrt6s_cache_cleanups++; 1221 n6expire[i]--; 1222 1223 *nptr = mfc->mf6c_next; 1224 free(mfc, M_MRTABLE); 1225 } else { 1226 nptr = &mfc->mf6c_next; 1227 } 1228 } 1229 } 1230 splx(s); 1231 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1232 expire_upcalls, NULL); 1233 } 1234 1235 /* 1236 * Packet forwarding routine once entry in the cache is made 1237 */ 1238 static int 1239 ip6_mdq(m, ifp, rt) 1240 struct mbuf *m; 1241 struct ifnet *ifp; 1242 struct mf6c *rt; 1243 { 1244 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1245 mifi_t mifi, iif; 1246 struct mif6 *mifp; 1247 int plen = m->m_pkthdr.len; 1248 1249 /* 1250 * Macro to send packet on mif. Since RSVP packets don't get counted on 1251 * input, they shouldn't get counted on output, so statistics keeping is 1252 * separate. 1253 */ 1254 1255 #define MC6_SEND(ip6, mifp, m) do { \ 1256 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1257 register_send((ip6), (mifp), (m)); \ 1258 else \ 1259 phyint_send((ip6), (mifp), (m)); \ 1260 } while (0) 1261 1262 /* 1263 * Don't forward if it didn't arrive from the parent mif 1264 * for its origin. 1265 */ 1266 mifi = rt->mf6c_parent; 1267 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1268 /* came in the wrong interface */ 1269 #ifdef MRT6DEBUG 1270 if (mrt6debug & DEBUG_FORWARD) 1271 log(LOG_DEBUG, 1272 "wrong if: ifid %d mifi %d mififid %x\n", 1273 ifp->if_index, mifi, 1274 mif6table[mifi].m6_ifp->if_index); 1275 #endif 1276 mrt6stat.mrt6s_wrong_if++; 1277 rt->mf6c_wrong_if++; 1278 /* 1279 * If we are doing PIM processing, and we are forwarding 1280 * packets on this interface, send a message to the 1281 * routing daemon. 1282 */ 1283 /* have to make sure this is a valid mif */ 1284 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1285 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1286 /* 1287 * Check the M_LOOP flag to avoid an 1288 * unnecessary PIM assert. 1289 * XXX: M_LOOP is an ad-hoc hack... 1290 */ 1291 static struct sockaddr_in6 sin6 = 1292 { sizeof(sin6), AF_INET6 }; 1293 1294 struct mbuf *mm; 1295 struct mrt6msg *im; 1296 #ifdef MRT6_OINIT 1297 struct omrt6msg *oim; 1298 #endif 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 #ifdef MRT6_OINIT 1309 oim = NULL; 1310 #endif 1311 im = NULL; 1312 switch (ip6_mrouter_ver) { 1313 #ifdef MRT6_OINIT 1314 case MRT6_OINIT: 1315 oim = mtod(mm, struct omrt6msg *); 1316 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1317 oim->im6_mbz = 0; 1318 break; 1319 #endif 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 #ifdef MRT6_OINIT 1338 case MRT6_OINIT: 1339 oim->im6_mif = iif; 1340 sin6.sin6_addr = oim->im6_src; 1341 break; 1342 #endif 1343 case MRT6_INIT: 1344 im->im6_mif = iif; 1345 sin6.sin6_addr = im->im6_src; 1346 break; 1347 } 1348 1349 mrt6stat.mrt6s_upcalls++; 1350 1351 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1352 #ifdef MRT6DEBUG 1353 if (mrt6debug) 1354 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1355 #endif 1356 ++mrt6stat.mrt6s_upq_sockfull; 1357 return ENOBUFS; 1358 } /* if socket Q full */ 1359 } /* if PIM */ 1360 return 0; 1361 } /* if wrong iif */ 1362 1363 /* If I sourced this packet, it counts as output, else it was input. */ 1364 if (m->m_pkthdr.rcvif == NULL) { 1365 /* XXX: is rcvif really NULL when output?? */ 1366 mif6table[mifi].m6_pkt_out++; 1367 mif6table[mifi].m6_bytes_out += plen; 1368 } else { 1369 mif6table[mifi].m6_pkt_in++; 1370 mif6table[mifi].m6_bytes_in += plen; 1371 } 1372 rt->mf6c_pkt_cnt++; 1373 rt->mf6c_byte_cnt += plen; 1374 1375 /* 1376 * For each mif, forward a copy of the packet if there are group 1377 * members downstream on the interface. 1378 */ 1379 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1380 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1381 /* 1382 * check if the outgoing packet is going to break 1383 * a scope boundary. 1384 * XXX For packets through PIM register tunnel 1385 * interface, we believe a routing daemon. 1386 */ 1387 if ((mif6table[rt->mf6c_parent].m6_flags & 1388 MIFF_REGISTER) == 0 && 1389 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1390 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1391 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1392 &ip6->ip6_dst) || 1393 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1394 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1395 &ip6->ip6_src))) { 1396 ip6stat.ip6s_badscope++; 1397 continue; 1398 } 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 = splnet(); /* needs to protect static "ro" below. */ 1417 static struct route_in6 ro; 1418 struct in6_multi *in6m; 1419 struct sockaddr_in6 *dst6; 1420 1421 /* 1422 * Make a new reference to the packet; make sure that 1423 * the IPv6 header is actually copied, not just referenced, 1424 * so that ip6_output() only scribbles on the copy. 1425 */ 1426 mb_copy = m_copy(m, 0, M_COPYALL); 1427 if (mb_copy && 1428 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1429 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1430 if (mb_copy == NULL) { 1431 splx(s); 1432 return; 1433 } 1434 /* set MCAST flag to the outgoing packet */ 1435 mb_copy->m_flags |= M_MCAST; 1436 1437 /* 1438 * If we sourced the packet, call ip6_output since we may devide 1439 * the packet into fragments when the packet is too big for the 1440 * outgoing interface. 1441 * Otherwise, we can simply send the packet to the interface 1442 * sending queue. 1443 */ 1444 if (m->m_pkthdr.rcvif == NULL) { 1445 struct ip6_moptions im6o; 1446 1447 im6o.im6o_multicast_ifp = ifp; 1448 /* XXX: ip6_output will override ip6->ip6_hlim */ 1449 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1450 im6o.im6o_multicast_loop = 1; 1451 error = ip6_output(mb_copy, NULL, &ro, 1452 IPV6_FORWARDING, &im6o, NULL, NULL); 1453 1454 #ifdef MRT6DEBUG 1455 if (mrt6debug & DEBUG_XMIT) 1456 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1457 mifp - mif6table, error); 1458 #endif 1459 splx(s); 1460 return; 1461 } 1462 1463 /* 1464 * If we belong to the destination multicast group 1465 * on the outgoing interface, loop back a copy. 1466 */ 1467 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1468 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1469 if (in6m != NULL) { 1470 dst6->sin6_len = sizeof(struct sockaddr_in6); 1471 dst6->sin6_family = AF_INET6; 1472 dst6->sin6_addr = ip6->ip6_dst; 1473 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1474 } 1475 /* 1476 * Put the packet into the sending queue of the outgoing interface 1477 * if it would fit in the MTU of the interface. 1478 */ 1479 if (mb_copy->m_pkthdr.len <= ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1480 dst6->sin6_len = sizeof(struct sockaddr_in6); 1481 dst6->sin6_family = AF_INET6; 1482 dst6->sin6_addr = ip6->ip6_dst; 1483 /* 1484 * We just call if_output instead of nd6_output here, since 1485 * we need no ND for a multicast forwarded packet...right? 1486 */ 1487 error = (*ifp->if_output)(ifp, mb_copy, 1488 (struct sockaddr *)&ro.ro_dst, NULL); 1489 #ifdef MRT6DEBUG 1490 if (mrt6debug & DEBUG_XMIT) 1491 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1492 mifp - mif6table, error); 1493 #endif 1494 } else { 1495 #ifdef MULTICAST_PMTUD 1496 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1497 #else 1498 #ifdef MRT6DEBUG 1499 if (mrt6debug & DEBUG_XMIT) 1500 log(LOG_DEBUG, 1501 "phyint_send: packet too big on %s o %s g %s" 1502 " size %d(discarded)\n", 1503 if_name(ifp), 1504 ip6_sprintf(&ip6->ip6_src), 1505 ip6_sprintf(&ip6->ip6_dst), 1506 mb_copy->m_pkthdr.len); 1507 #endif /* MRT6DEBUG */ 1508 m_freem(mb_copy); /* simply discard the packet */ 1509 #endif 1510 } 1511 1512 splx(s); 1513 } 1514 1515 static int 1516 register_send(ip6, mif, m) 1517 struct ip6_hdr *ip6; 1518 struct mif6 *mif; 1519 struct mbuf *m; 1520 { 1521 struct mbuf *mm; 1522 int i, len = m->m_pkthdr.len; 1523 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1524 struct mrt6msg *im6; 1525 1526 #ifdef MRT6DEBUG 1527 if (mrt6debug) 1528 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1529 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1530 #endif 1531 ++pim6stat.pim6s_snd_registers; 1532 1533 /* Make a copy of the packet to send to the user level process */ 1534 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1535 if (mm == NULL) 1536 return ENOBUFS; 1537 mm->m_pkthdr.rcvif = NULL; 1538 mm->m_data += max_linkhdr; 1539 mm->m_len = sizeof(struct ip6_hdr); 1540 1541 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1542 m_freem(mm); 1543 return ENOBUFS; 1544 } 1545 i = MHLEN - M_LEADINGSPACE(mm); 1546 if (i > len) 1547 i = len; 1548 mm = m_pullup(mm, i); 1549 if (mm == NULL) 1550 return ENOBUFS; 1551 /* TODO: check it! */ 1552 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1553 1554 /* 1555 * Send message to routing daemon 1556 */ 1557 sin6.sin6_addr = ip6->ip6_src; 1558 1559 im6 = mtod(mm, struct mrt6msg *); 1560 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1561 im6->im6_mbz = 0; 1562 1563 im6->im6_mif = mif - mif6table; 1564 1565 /* iif info is not given for reg. encap.n */ 1566 mrt6stat.mrt6s_upcalls++; 1567 1568 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1569 #ifdef MRT6DEBUG 1570 if (mrt6debug) 1571 log(LOG_WARNING, 1572 "register_send: ip6_mrouter socket queue full\n"); 1573 #endif 1574 ++mrt6stat.mrt6s_upq_sockfull; 1575 return ENOBUFS; 1576 } 1577 return 0; 1578 } 1579 1580 /* 1581 * PIM sparse mode hook 1582 * Receives the pim control messages, and passes them up to the listening 1583 * socket, using rip6_input. 1584 * The only message processed is the REGISTER pim message; the pim header 1585 * is stripped off, and the inner packet is passed to register_mforward. 1586 */ 1587 int 1588 pim6_input(mp, offp, proto) 1589 struct mbuf **mp; 1590 int *offp, proto; 1591 { 1592 struct pim *pim; /* pointer to a pim struct */ 1593 struct ip6_hdr *ip6; 1594 int pimlen; 1595 struct mbuf *m = *mp; 1596 int minlen; 1597 int off = *offp; 1598 1599 ++pim6stat.pim6s_rcv_total; 1600 1601 ip6 = mtod(m, struct ip6_hdr *); 1602 pimlen = m->m_pkthdr.len - *offp; 1603 1604 /* 1605 * Validate lengths 1606 */ 1607 if (pimlen < PIM_MINLEN) { 1608 ++pim6stat.pim6s_rcv_tooshort; 1609 #ifdef MRT6DEBUG 1610 if (mrt6debug & DEBUG_PIM) 1611 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1612 #endif 1613 m_freem(m); 1614 return(IPPROTO_DONE); 1615 } 1616 1617 /* 1618 * if the packet is at least as big as a REGISTER, go ahead 1619 * and grab the PIM REGISTER header size, to avoid another 1620 * possible m_pullup() later. 1621 * 1622 * PIM_MINLEN == pimhdr + u_int32 == 8 1623 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1624 */ 1625 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1626 1627 /* 1628 * Make sure that the IP6 and PIM headers in contiguous memory, and 1629 * possibly the PIM REGISTER header 1630 */ 1631 #ifndef PULLDOWN_TEST 1632 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1633 /* adjust pointer */ 1634 ip6 = mtod(m, struct ip6_hdr *); 1635 1636 /* adjust mbuf to point to the PIM header */ 1637 pim = (struct pim *)((caddr_t)ip6 + off); 1638 #else 1639 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1640 if (pim == NULL) { 1641 pim6stat.pim6s_rcv_tooshort++; 1642 return IPPROTO_DONE; 1643 } 1644 #endif 1645 1646 #define PIM6_CHECKSUM 1647 #ifdef PIM6_CHECKSUM 1648 { 1649 int cksumlen; 1650 1651 /* 1652 * Validate checksum. 1653 * If PIM REGISTER, exclude the data packet 1654 */ 1655 if (pim->pim_type == PIM_REGISTER) 1656 cksumlen = PIM_MINLEN; 1657 else 1658 cksumlen = pimlen; 1659 1660 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1661 ++pim6stat.pim6s_rcv_badsum; 1662 #ifdef MRT6DEBUG 1663 if (mrt6debug & DEBUG_PIM) 1664 log(LOG_DEBUG, 1665 "pim6_input: invalid checksum\n"); 1666 #endif 1667 m_freem(m); 1668 return(IPPROTO_DONE); 1669 } 1670 } 1671 #endif /* PIM_CHECKSUM */ 1672 1673 /* PIM version check */ 1674 if (pim->pim_ver != PIM_VERSION) { 1675 ++pim6stat.pim6s_rcv_badversion; 1676 #ifdef MRT6DEBUG 1677 log(LOG_ERR, 1678 "pim6_input: incorrect version %d, expecting %d\n", 1679 pim->pim_ver, PIM_VERSION); 1680 #endif 1681 m_freem(m); 1682 return(IPPROTO_DONE); 1683 } 1684 1685 if (pim->pim_type == PIM_REGISTER) { 1686 /* 1687 * since this is a REGISTER, we'll make a copy of the register 1688 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1689 * routing daemon. 1690 */ 1691 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1692 1693 struct mbuf *mcp; 1694 struct ip6_hdr *eip6; 1695 u_int32_t *reghdr; 1696 int rc; 1697 1698 ++pim6stat.pim6s_rcv_registers; 1699 1700 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1701 #ifdef MRT6DEBUG 1702 if (mrt6debug & DEBUG_PIM) 1703 log(LOG_DEBUG, 1704 "pim6_input: register mif not set: %d\n", 1705 reg_mif_num); 1706 #endif 1707 m_freem(m); 1708 return(IPPROTO_DONE); 1709 } 1710 1711 reghdr = (u_int32_t *)(pim + 1); 1712 1713 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1714 goto pim6_input_to_daemon; 1715 1716 /* 1717 * Validate length 1718 */ 1719 if (pimlen < PIM6_REG_MINLEN) { 1720 ++pim6stat.pim6s_rcv_tooshort; 1721 ++pim6stat.pim6s_rcv_badregisters; 1722 #ifdef MRT6DEBUG 1723 log(LOG_ERR, 1724 "pim6_input: register packet size too " 1725 "small %d from %s\n", 1726 pimlen, ip6_sprintf(&ip6->ip6_src)); 1727 #endif 1728 m_freem(m); 1729 return(IPPROTO_DONE); 1730 } 1731 1732 eip6 = (struct ip6_hdr *) (reghdr + 1); 1733 #ifdef MRT6DEBUG 1734 if (mrt6debug & DEBUG_PIM) 1735 log(LOG_DEBUG, 1736 "pim6_input[register], eip6: %s -> %s, " 1737 "eip6 plen %d\n", 1738 ip6_sprintf(&eip6->ip6_src), 1739 ip6_sprintf(&eip6->ip6_dst), 1740 ntohs(eip6->ip6_plen)); 1741 #endif 1742 1743 /* verify the version number of the inner packet */ 1744 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1745 ++pim6stat.pim6s_rcv_badregisters; 1746 #ifdef MRT6DEBUG 1747 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1748 "of the inner packet\n", 1749 (eip6->ip6_vfc & IPV6_VERSION)); 1750 #endif 1751 m_freem(m); 1752 return(IPPROTO_NONE); 1753 } 1754 1755 /* verify the inner packet is destined to a mcast group */ 1756 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1757 ++pim6stat.pim6s_rcv_badregisters; 1758 #ifdef MRT6DEBUG 1759 if (mrt6debug & DEBUG_PIM) 1760 log(LOG_DEBUG, 1761 "pim6_input: inner packet of register " 1762 "is not multicast %s\n", 1763 ip6_sprintf(&eip6->ip6_dst)); 1764 #endif 1765 m_freem(m); 1766 return(IPPROTO_DONE); 1767 } 1768 1769 /* 1770 * make a copy of the whole header to pass to the daemon later. 1771 */ 1772 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1773 if (mcp == NULL) { 1774 #ifdef MRT6DEBUG 1775 log(LOG_ERR, 1776 "pim6_input: pim register: " 1777 "could not copy register head\n"); 1778 #endif 1779 m_freem(m); 1780 return(IPPROTO_DONE); 1781 } 1782 1783 /* 1784 * forward the inner ip6 packet; point m_data at the inner ip6. 1785 */ 1786 m_adj(m, off + PIM_MINLEN); 1787 #ifdef MRT6DEBUG 1788 if (mrt6debug & DEBUG_PIM) { 1789 log(LOG_DEBUG, 1790 "pim6_input: forwarding decapsulated register: " 1791 "src %s, dst %s, mif %d\n", 1792 ip6_sprintf(&eip6->ip6_src), 1793 ip6_sprintf(&eip6->ip6_dst), 1794 reg_mif_num); 1795 } 1796 #endif 1797 1798 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1799 dst.sin6_family, 0); 1800 1801 /* prepare the register head to send to the mrouting daemon */ 1802 m = mcp; 1803 } 1804 1805 /* 1806 * Pass the PIM message up to the daemon; if it is a register message 1807 * pass the 'head' only up to the daemon. This includes the 1808 * encapsulator ip6 header, pim header, register header and the 1809 * encapsulated ip6 header. 1810 */ 1811 pim6_input_to_daemon: 1812 rip6_input(&m, offp, proto); 1813 return(IPPROTO_DONE); 1814 }
Cache object: c24f47ba90b86da3dca1a66b72c090de
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