ip6_mroute.c revision 1.7
1 /* $NetBSD: ip6_mroute.c,v 1.7 1999/07/22 15:46:13 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ 33 34 /* 35 * IP multicast forwarding procedures 36 * 37 * Written by David Waitzman, BBN Labs, August 1988. 38 * Modified by Steve Deering, Stanford, February 1989. 39 * Modified by Mark J. Steiglitz, Stanford, May, 1991 40 * Modified by Van Jacobson, LBL, January 1993 41 * Modified by Ajit Thyagarajan, PARC, August 1993 42 * Modified by Bill Fenenr, PARC, April 1994 43 * 44 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 45 */ 46 47 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 48 #include "opt_inet.h" 49 #endif 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/mbuf.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/sockio.h> 57 #include <sys/protosw.h> 58 #include <sys/errno.h> 59 #include <sys/time.h> 60 #include <sys/kernel.h> 61 #if !defined(__FreeBSD__) || __FreeBSD__ < 3 62 #include <sys/ioctl.h> 63 #endif 64 #include <sys/syslog.h> 65 66 #include <net/if.h> 67 #include <net/route.h> 68 #include <net/raw_cb.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_var.h> 72 73 #include <netinet6/ip6.h> 74 #include <netinet6/ip6_var.h> 75 #include <netinet6/ip6_mroute.h> 76 #include <netinet6/pim6.h> 77 #include <netinet6/pim6_var.h> 78 79 #define M_HASCL(m) ((m)->m_flags & M_EXT) 80 81 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 82 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 83 84 static int set_pim6 __P((int *)); 85 static int get_pim6 __P((struct mbuf *)); 86 static int socket_send __P((struct socket *, struct mbuf *, 87 struct sockaddr_in6 *)); 88 static int register_send __P((struct ip6_hdr *, struct mif6 *, 89 struct mbuf *)); 90 91 /* 92 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 93 * except for netstat or debugging purposes. 94 */ 95 struct socket *ip6_mrouter = NULL; 96 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 97 struct mrt6stat mrt6stat; 98 99 #define NO_RTE_FOUND 0x1 100 #define RTE_FOUND 0x2 101 102 struct mf6c *mf6ctable[MF6CTBLSIZ]; 103 u_char nexpire[MF6CTBLSIZ]; 104 static struct mif6 mif6table[MAXMIFS]; 105 #ifdef MRT6DEBUG 106 u_int mrt6debug = 0; /* debug level */ 107 #define DEBUG_MFC 0x02 108 #define DEBUG_FORWARD 0x04 109 #define DEBUG_EXPIRE 0x08 110 #define DEBUG_XMIT 0x10 111 #define DEBUG_REG 0x20 112 #define DEBUG_PIM 0x40 113 #endif 114 115 static void expire_upcalls __P((void *)); 116 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 117 #define UPCALL_EXPIRE 6 /* number of timeouts */ 118 119 #ifdef INET 120 #ifdef MROUTING 121 extern struct socket *ip_mrouter; 122 #endif 123 #endif 124 125 /* 126 * 'Interfaces' associated with decapsulator (so we can tell 127 * packets that went through it from ones that get reflected 128 * by a broken gateway). These interfaces are never linked into 129 * the system ifnet list & no routes point to them. I.e., packets 130 * can't be sent this way. They only exist as a placeholder for 131 * multicast source verification. 132 */ 133 struct ifnet multicast_register_if; 134 135 #define ENCAP_HOPS 64 136 137 /* 138 * Private variables. 139 */ 140 static mifi_t nummifs = 0; 141 static mifi_t reg_mif_num = (mifi_t)-1; 142 143 static struct pim6stat pim6stat; 144 145 /* 146 * one-back cache used by ipip_input to locate a tunnel's mif 147 * given a datagram's src ip address. 148 */ 149 static int pim6; 150 151 /* 152 * Hash function for a source, group entry 153 */ 154 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 155 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 156 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 157 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 158 159 /* 160 * Find a route for a given origin IPv6 address and Multicast group address. 161 * Quality of service parameter to be added in the future!!! 162 */ 163 164 #define MF6CFIND(o, g, rt) { \ 165 register struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 166 rt = NULL; \ 167 mrt6stat.mrt6s_mfc_lookups++; \ 168 while (_rt) { \ 169 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 170 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 171 (_rt->mf6c_stall == NULL)) { \ 172 rt = _rt; \ 173 break; \ 174 } \ 175 _rt = _rt->mf6c_next; \ 176 } \ 177 if (rt == NULL) { \ 178 mrt6stat.mrt6s_mfc_misses++; \ 179 } \ 180 } 181 182 /* 183 * Macros to compute elapsed time efficiently 184 * Borrowed from Van Jacobson's scheduling code 185 */ 186 #define TV_DELTA(a, b, delta) { \ 187 register int xxs; \ 188 \ 189 delta = (a).tv_usec - (b).tv_usec; \ 190 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 191 switch (xxs) { \ 192 case 2: \ 193 delta += 1000000; \ 194 /* fall through */ \ 195 case 1: \ 196 delta += 1000000; \ 197 break; \ 198 default: \ 199 delta += (1000000 * xxs); \ 200 } \ 201 } \ 202 } 203 204 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 205 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 206 207 #ifdef UPCALL_TIMING 208 #define UPCALL_MAX 50 209 u_long upcall_data[UPCALL_MAX + 1]; 210 static void collate(); 211 #endif /* UPCALL_TIMING */ 212 213 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 214 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 215 static int ip6_mrouter_init __P((struct socket *, struct mbuf *)); 216 static int add_m6if __P((struct mif6ctl *)); 217 static int del_m6if __P((mifi_t *)); 218 static int add_m6fc __P((struct mf6cctl *)); 219 static int del_m6fc __P((struct mf6cctl *)); 220 221 /* 222 * Handle MRT setsockopt commands to modify the multicast routing tables. 223 */ 224 int 225 ip6_mrouter_set(cmd, so, m) 226 int cmd; 227 struct socket *so; 228 struct mbuf *m; 229 { 230 if (cmd != MRT6_INIT && so != ip6_mrouter) 231 return EACCES; 232 233 switch (cmd) { 234 case MRT6_INIT: return ip6_mrouter_init(so, m); 235 case MRT6_DONE: return ip6_mrouter_done(); 236 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 237 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 238 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 239 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 240 case MRT6_PIM: return set_pim6(mtod(m, int *)); 241 default: return EOPNOTSUPP; 242 } 243 } 244 245 /* 246 * Handle MRT getsockopt commands 247 */ 248 int 249 ip6_mrouter_get(cmd, so, m) 250 int cmd; 251 struct socket *so; 252 struct mbuf **m; 253 { 254 struct mbuf *mb; 255 256 if (so != ip6_mrouter) return EACCES; 257 258 *m = mb = m_get(M_WAIT, MT_SOOPTS); 259 260 switch (cmd) { 261 case MRT6_PIM: return get_pim6(mb); 262 default: 263 m_free(mb); 264 return EOPNOTSUPP; 265 } 266 } 267 268 /* 269 * Handle ioctl commands to obtain information from the cache 270 */ 271 int 272 mrt6_ioctl(cmd, data) 273 int cmd; 274 caddr_t data; 275 { 276 int error = 0; 277 278 switch (cmd) { 279 case SIOCGETSGCNT_IN6: 280 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 281 break; /* for safety */ 282 case SIOCGETMIFCNT_IN6: 283 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 284 break; /* for safety */ 285 default: 286 return (EINVAL); 287 break; 288 } 289 return error; 290 } 291 292 /* 293 * returns the packet, byte, rpf-failure count for the source group provided 294 */ 295 static int 296 get_sg_cnt(req) 297 register struct sioc_sg_req6 *req; 298 { 299 register struct mf6c *rt; 300 int s; 301 302 s = splsoftnet(); 303 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 304 splx(s); 305 if (rt != NULL) { 306 req->pktcnt = rt->mf6c_pkt_cnt; 307 req->bytecnt = rt->mf6c_byte_cnt; 308 req->wrong_if = rt->mf6c_wrong_if; 309 } else 310 return(ESRCH); 311 #if 0 312 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 313 #endif 314 315 return 0; 316 } 317 318 /* 319 * returns the input and output packet and byte counts on the mif provided 320 */ 321 static int 322 get_mif6_cnt(req) 323 register struct sioc_mif_req6 *req; 324 { 325 register mifi_t mifi = req->mifi; 326 327 if (mifi >= nummifs) 328 return EINVAL; 329 330 req->icount = mif6table[mifi].m6_pkt_in; 331 req->ocount = mif6table[mifi].m6_pkt_out; 332 req->ibytes = mif6table[mifi].m6_bytes_in; 333 req->obytes = mif6table[mifi].m6_bytes_out; 334 335 return 0; 336 } 337 338 /* 339 * Get PIM processiong global 340 */ 341 static int 342 get_pim6(m) 343 struct mbuf *m; 344 { 345 int *i; 346 347 i = mtod(m, int *); 348 349 *i = pim6; 350 351 return 0; 352 } 353 354 static int 355 set_pim6(i) 356 int *i; 357 { 358 if ((*i != 1) && (*i != 0)) 359 return EINVAL; 360 361 pim6 = *i; 362 363 return 0; 364 } 365 366 /* 367 * Enable multicast routing 368 */ 369 static int 370 ip6_mrouter_init(so, m) 371 struct socket *so; 372 struct mbuf *m; 373 { 374 int *v; 375 376 #ifdef MRT6DEBUG 377 if (mrt6debug) 378 log(LOG_DEBUG, 379 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 380 so->so_type, so->so_proto->pr_protocol); 381 #endif 382 383 if (so->so_type != SOCK_RAW || 384 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 385 return EOPNOTSUPP; 386 387 if (!m || (m->m_len != sizeof(int *))) 388 return ENOPROTOOPT; 389 390 v = mtod(m, int *); 391 if (*v != 1) 392 return ENOPROTOOPT; 393 394 if (ip6_mrouter != NULL) return EADDRINUSE; 395 396 ip6_mrouter = so; 397 398 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 399 bzero((caddr_t)nexpire, sizeof(nexpire)); 400 401 pim6 = 0;/* used for stubbing out/in pim stuff */ 402 403 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 404 405 #ifdef MRT6DEBUG 406 if (mrt6debug) 407 log(LOG_DEBUG, "ip6_mrouter_init\n"); 408 #endif 409 410 return 0; 411 } 412 413 /* 414 * Disable multicast routing 415 */ 416 int 417 ip6_mrouter_done() 418 { 419 mifi_t mifi; 420 int i; 421 struct ifnet *ifp; 422 struct in6_ifreq ifr; 423 struct mf6c *rt; 424 struct rtdetq *rte; 425 int s; 426 427 s = splsoftnet(); 428 429 /* 430 * For each phyint in use, disable promiscuous reception of all IPv6 431 * multicasts. 432 */ 433 #ifdef INET 434 #ifdef MROUTING 435 /* 436 * If there is still IPv4 multicast routing daemon, 437 * we remain interfaces to receive all muliticasted packets. 438 * XXX: there may be an interface in which the IPv4 multicast 439 * daemon is not interested... 440 */ 441 if (!ip_mrouter) 442 #endif 443 #endif 444 { 445 for (mifi = 0; mifi < nummifs; mifi++) { 446 if (mif6table[mifi].m6_ifp && 447 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 448 ifr.ifr_addr.sin6_family = AF_INET6; 449 ifr.ifr_addr.sin6_addr= in6addr_any; 450 ifp = mif6table[mifi].m6_ifp; 451 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 452 (caddr_t)&ifr); 453 } 454 } 455 } 456 #ifdef notyet 457 bzero((caddr_t)qtable, sizeof(qtable)); 458 bzero((caddr_t)tbftable, sizeof(tbftable)); 459 #endif 460 bzero((caddr_t)mif6table, sizeof(mif6table)); 461 nummifs = 0; 462 463 pim6 = 0; /* used to stub out/in pim specific code */ 464 465 untimeout(expire_upcalls, (caddr_t)NULL); 466 467 /* 468 * Free all multicast forwarding cache entries. 469 */ 470 for (i = 0; i < MF6CTBLSIZ; i++) { 471 rt = mf6ctable[i]; 472 while (rt) { 473 struct mf6c *frt; 474 475 for (rte = rt->mf6c_stall; rte != NULL; ) { 476 struct rtdetq *n = rte->next; 477 478 m_free(rte->m); 479 free(rte, M_MRTABLE); 480 rte = n; 481 } 482 frt = rt; 483 rt = rt->mf6c_next; 484 free(frt, M_MRTABLE); 485 } 486 } 487 488 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 489 490 /* 491 * Reset de-encapsulation cache 492 */ 493 reg_mif_num = -1; 494 495 ip6_mrouter = NULL; 496 497 splx(s); 498 499 #ifdef MRT6DEBUG 500 if (mrt6debug) 501 log(LOG_DEBUG, "ip6_mrouter_done\n"); 502 #endif 503 504 return 0; 505 } 506 507 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 508 509 /* 510 * Add a mif to the mif table 511 */ 512 static int 513 add_m6if(mifcp) 514 register struct mif6ctl *mifcp; 515 { 516 register struct mif6 *mifp; 517 struct ifnet *ifp; 518 struct in6_ifreq ifr; 519 int error, s; 520 #ifdef notyet 521 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 522 #endif 523 524 if (mifcp->mif6c_mifi >= MAXMIFS) 525 return EINVAL; 526 mifp = mif6table + mifcp->mif6c_mifi; 527 if (mifp->m6_ifp) 528 return EADDRINUSE; /* XXX: is it appropriate? */ 529 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 530 return ENXIO; 531 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 532 533 if (mifcp->mif6c_flags & MIFF_REGISTER) { 534 if (reg_mif_num == (mifi_t)-1) { 535 #ifdef __NetBSD__ 536 strcpy(multicast_register_if.if_xname, 537 "register_mif"); /* XXX */ 538 #else 539 multicast_register_if.if_name = "register_mif"; 540 #endif 541 multicast_register_if.if_flags |= IFF_LOOPBACK; 542 multicast_register_if.if_index = mifcp->mif6c_mifi; 543 reg_mif_num = mifcp->mif6c_mifi; 544 } 545 546 ifp = &multicast_register_if; 547 548 } /* if REGISTER */ 549 else { 550 /* Make sure the interface supports multicast */ 551 if ((ifp->if_flags & IFF_MULTICAST) == 0) 552 return EOPNOTSUPP; 553 554 /* 555 * Enable promiscuous reception of all IPv6 multicasts 556 * from the if 557 */ 558 ifr.ifr_addr.sin6_family = AF_INET6; 559 ifr.ifr_addr.sin6_addr = in6addr_any; 560 s = splsoftnet(); 561 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 562 splx(s); 563 if (error) 564 return error; 565 } 566 567 s = splsoftnet(); 568 mifp->m6_flags = mifcp->mif6c_flags; 569 mifp->m6_ifp = ifp; 570 #ifdef notyet 571 /* scaling up here allows division by 1024 in critical code */ 572 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 573 #endif 574 /* initialize per mif pkt counters */ 575 mifp->m6_pkt_in = 0; 576 mifp->m6_pkt_out = 0; 577 mifp->m6_bytes_in = 0; 578 mifp->m6_bytes_out = 0; 579 splx(s); 580 581 /* Adjust nummifs up if the mifi is higher than nummifs */ 582 if (nummifs <= mifcp->mif6c_mifi) 583 nummifs = mifcp->mif6c_mifi + 1; 584 585 #ifdef MRT6DEBUG 586 if (mrt6debug) 587 log(LOG_DEBUG, 588 "add_mif #%d, phyint %s%d\n", 589 mifcp->mif6c_mifi, 590 ifp->if_name, ifp->if_unit); 591 #endif 592 593 return 0; 594 } 595 596 /* 597 * Delete a mif from the mif table 598 */ 599 static int 600 del_m6if(mifip) 601 mifi_t *mifip; 602 { 603 register struct mif6 *mifp = mif6table + *mifip; 604 register mifi_t mifi; 605 struct ifnet *ifp; 606 struct in6_ifreq ifr; 607 int s; 608 609 if (*mifip >= nummifs) 610 return EINVAL; 611 if (mifp->m6_ifp == NULL) 612 return EINVAL; 613 614 s = splsoftnet(); 615 616 if (!(mifp->m6_flags & MIFF_REGISTER)) { 617 /* 618 * XXX: what if there is yet IPv4 multicast daemon 619 * using the interface? 620 */ 621 ifr.ifr_addr.sin6_family = AF_INET6; 622 ifr.ifr_addr.sin6_addr = in6addr_any; 623 ifp = mifp->m6_ifp; 624 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 625 } 626 627 #ifdef notyet 628 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 629 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 630 #endif 631 bzero((caddr_t)mifp, sizeof (*mifp)); 632 633 /* Adjust nummifs down */ 634 for (mifi = nummifs; mifi > 0; mifi--) 635 if (mif6table[mifi - 1].m6_ifp) 636 break; 637 nummifs = mifi; 638 639 splx(s); 640 641 #ifdef MRT6DEBUG 642 if (mrt6debug) 643 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 644 #endif 645 646 return 0; 647 } 648 649 /* 650 * Add an mfc entry 651 */ 652 static int 653 add_m6fc(mfccp) 654 struct mf6cctl *mfccp; 655 { 656 struct mf6c *rt; 657 u_long hash; 658 struct rtdetq *rte; 659 register u_short nstl; 660 int s; 661 662 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 663 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 664 665 /* If an entry already exists, just update the fields */ 666 if (rt) { 667 #ifdef MRT6DEBUG 668 if (mrt6debug & DEBUG_MFC) 669 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 670 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 671 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 672 mfccp->mf6cc_parent); 673 #endif 674 675 s = splsoftnet(); 676 rt->mf6c_parent = mfccp->mf6cc_parent; 677 rt->mf6c_ifset = mfccp->mf6cc_ifset; 678 splx(s); 679 return 0; 680 } 681 682 /* 683 * Find the entry for which the upcall was made and update 684 */ 685 s = splsoftnet(); 686 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 687 mfccp->mf6cc_mcastgrp.sin6_addr); 688 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 689 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 690 &mfccp->mf6cc_origin.sin6_addr) && 691 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 692 &mfccp->mf6cc_mcastgrp.sin6_addr) && 693 (rt->mf6c_stall != NULL)) { 694 695 if (nstl++) 696 log(LOG_ERR, 697 "add_m6fc: %s o %s g %s p %x dbx %p\n", 698 "multiple kernel entries", 699 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 700 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 701 mfccp->mf6cc_parent, rt->mf6c_stall); 702 703 #ifdef MRT6DEBUG 704 if (mrt6debug & DEBUG_MFC) 705 log(LOG_DEBUG, 706 "add_m6fc o %s g %s p %x dbg %x\n", 707 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 708 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 709 mfccp->mf6cc_parent, rt->mf6c_stall); 710 #endif 711 712 rt->mf6c_origin = mfccp->mf6cc_origin; 713 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 714 rt->mf6c_parent = mfccp->mf6cc_parent; 715 rt->mf6c_ifset = mfccp->mf6cc_ifset; 716 /* initialize pkt counters per src-grp */ 717 rt->mf6c_pkt_cnt = 0; 718 rt->mf6c_byte_cnt = 0; 719 rt->mf6c_wrong_if = 0; 720 721 rt->mf6c_expire = 0; /* Don't clean this guy up */ 722 nexpire[hash]--; 723 724 /* free packets Qed at the end of this entry */ 725 for (rte = rt->mf6c_stall; rte != NULL; ) { 726 struct rtdetq *n = rte->next; 727 ip6_mdq(rte->m, rte->ifp, rt); 728 m_freem(rte->m); 729 #ifdef UPCALL_TIMING 730 collate(&(rte->t)); 731 #endif /* UPCALL_TIMING */ 732 free(rte, M_MRTABLE); 733 rte = n; 734 } 735 rt->mf6c_stall = NULL; 736 } 737 } 738 739 /* 740 * It is possible that an entry is being inserted without an upcall 741 */ 742 if (nstl == 0) { 743 #ifdef MRT6DEBUG 744 if (mrt6debug & DEBUG_MFC) 745 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 746 hash, 747 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 748 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 749 mfccp->mf6cc_parent); 750 #endif 751 752 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 753 754 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 755 &mfccp->mf6cc_origin.sin6_addr)&& 756 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 757 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 758 759 rt->mf6c_origin = mfccp->mf6cc_origin; 760 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 761 rt->mf6c_parent = mfccp->mf6cc_parent; 762 /* initialize pkt counters per src-grp */ 763 rt->mf6c_pkt_cnt = 0; 764 rt->mf6c_byte_cnt = 0; 765 rt->mf6c_wrong_if = 0; 766 767 if (rt->mf6c_expire) 768 nexpire[hash]--; 769 rt->mf6c_expire = 0; 770 } 771 } 772 if (rt == NULL) { 773 /* no upcall, so make a new entry */ 774 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 775 M_NOWAIT); 776 if (rt == NULL) { 777 splx(s); 778 return ENOBUFS; 779 } 780 781 /* insert new entry at head of hash chain */ 782 rt->mf6c_origin = mfccp->mf6cc_origin; 783 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 784 rt->mf6c_parent = mfccp->mf6cc_parent; 785 /* initialize pkt counters per src-grp */ 786 rt->mf6c_pkt_cnt = 0; 787 rt->mf6c_byte_cnt = 0; 788 rt->mf6c_wrong_if = 0; 789 rt->mf6c_expire = 0; 790 rt->mf6c_stall = NULL; 791 792 /* link into table */ 793 rt->mf6c_next = mf6ctable[hash]; 794 mf6ctable[hash] = rt; 795 } 796 } 797 splx(s); 798 return 0; 799 } 800 801 #ifdef UPCALL_TIMING 802 /* 803 * collect delay statistics on the upcalls 804 */ 805 static void 806 collate(t) 807 register struct timeval *t; 808 { 809 register u_long d; 810 register struct timeval tp; 811 register u_long delta; 812 813 GET_TIME(tp); 814 815 if (TV_LT(*t, tp)) 816 { 817 TV_DELTA(tp, *t, delta); 818 819 d = delta >> 10; 820 if (d > UPCALL_MAX) 821 d = UPCALL_MAX; 822 823 ++upcall_data[d]; 824 } 825 } 826 #endif /* UPCALL_TIMING */ 827 828 /* 829 * Delete an mfc entry 830 */ 831 static int 832 del_m6fc(mfccp) 833 struct mf6cctl *mfccp; 834 { 835 struct sockaddr_in6 origin; 836 struct sockaddr_in6 mcastgrp; 837 struct mf6c *rt; 838 struct mf6c **nptr; 839 u_long hash; 840 int s; 841 842 origin = mfccp->mf6cc_origin; 843 mcastgrp = mfccp->mf6cc_mcastgrp; 844 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 845 846 #ifdef MRT6DEBUG 847 if (mrt6debug & DEBUG_MFC) 848 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 849 ip6_sprintf(&origin.sin6_addr), 850 ip6_sprintf(&mcastgrp.sin6_addr)); 851 #endif 852 853 s = splsoftnet(); 854 855 nptr = &mf6ctable[hash]; 856 while ((rt = *nptr) != NULL) { 857 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 858 &rt->mf6c_origin.sin6_addr) && 859 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 860 &rt->mf6c_mcastgrp.sin6_addr) && 861 rt->mf6c_stall == NULL) 862 break; 863 864 nptr = &rt->mf6c_next; 865 } 866 if (rt == NULL) { 867 splx(s); 868 return EADDRNOTAVAIL; 869 } 870 871 *nptr = rt->mf6c_next; 872 free(rt, M_MRTABLE); 873 874 splx(s); 875 876 return 0; 877 } 878 879 static int 880 socket_send(s, mm, src) 881 struct socket *s; 882 struct mbuf *mm; 883 struct sockaddr_in6 *src; 884 { 885 if (s) { 886 if (sbappendaddr(&s->so_rcv, 887 (struct sockaddr *)src, 888 mm, (struct mbuf *)0) != 0) { 889 sorwakeup(s); 890 return 0; 891 } 892 } 893 m_freem(mm); 894 return -1; 895 } 896 897 /* 898 * IPv6 multicast forwarding function. This function assumes that the packet 899 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 900 * pointed to by "ifp", and the packet is to be relayed to other networks 901 * that have members of the packet's destination IPv6 multicast group. 902 * 903 * The packet is returned unscathed to the caller, unless it is 904 * erroneous, in which case a non-zero return value tells the caller to 905 * discard it. 906 */ 907 908 int 909 ip6_mforward(ip6, ifp, m) 910 register struct ip6_hdr *ip6; 911 struct ifnet *ifp; 912 struct mbuf *m; 913 { 914 register struct mf6c *rt; 915 register struct mif6 *mifp; 916 register struct mbuf *mm; 917 int s; 918 mifi_t mifi; 919 920 #ifdef MRT6DEBUG 921 if (mrt6debug & DEBUG_FORWARD) 922 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 923 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 924 ifp->if_index); 925 #endif 926 927 /* 928 * Don't forward a packet with Hop limit of zero or one, 929 * or a packet destined to a local-only group. 930 */ 931 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 932 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 933 return 0; 934 ip6->ip6_hlim--; 935 936 /* 937 * Determine forwarding mifs from the forwarding cache table 938 */ 939 s = splsoftnet(); 940 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 941 942 /* Entry exists, so forward if necessary */ 943 if (rt) { 944 splx(s); 945 return (ip6_mdq(m, ifp, rt)); 946 } else { 947 /* 948 * If we don't have a route for packet's origin, 949 * Make a copy of the packet & 950 * send message to routing daemon 951 */ 952 953 register struct mbuf *mb0; 954 register struct rtdetq *rte; 955 register u_long hash; 956 /* register int i, npkts;*/ 957 #ifdef UPCALL_TIMING 958 struct timeval tp; 959 960 GET_TIME(tp); 961 #endif /* UPCALL_TIMING */ 962 963 mrt6stat.mrt6s_no_route++; 964 #ifdef MRT6DEBUG 965 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 966 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 967 ip6_sprintf(&ip6->ip6_src), 968 ip6_sprintf(&ip6->ip6_dst)); 969 #endif 970 971 /* 972 * Allocate mbufs early so that we don't do extra work if we 973 * are just going to fail anyway. 974 */ 975 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 976 M_NOWAIT); 977 if (rte == NULL) { 978 splx(s); 979 return ENOBUFS; 980 } 981 mb0 = m_copy(m, 0, M_COPYALL); 982 /* 983 * Pullup packet header if needed before storing it, 984 * as other references may modify it in the meantime. 985 */ 986 if (mb0 && 987 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 988 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 989 if (mb0 == NULL) { 990 free(rte, M_MRTABLE); 991 splx(s); 992 return ENOBUFS; 993 } 994 995 /* is there an upcall waiting for this packet? */ 996 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 997 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 998 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 999 &rt->mf6c_origin.sin6_addr) && 1000 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1001 &rt->mf6c_mcastgrp.sin6_addr) && 1002 (rt->mf6c_stall != NULL)) 1003 break; 1004 } 1005 1006 if (rt == NULL) { 1007 struct mrt6msg *im; 1008 1009 /* no upcall, so make a new entry */ 1010 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1011 M_NOWAIT); 1012 if (rt == NULL) { 1013 free(rte, M_MRTABLE); 1014 m_freem(mb0); 1015 splx(s); 1016 return ENOBUFS; 1017 } 1018 /* 1019 * Make a copy of the header to send to the user 1020 * level process 1021 */ 1022 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1023 1024 if (mm == NULL) { 1025 free(rte, M_MRTABLE); 1026 m_freem(mb0); 1027 free(rt, M_MRTABLE); 1028 splx(s); 1029 return ENOBUFS; 1030 } 1031 1032 /* 1033 * Send message to routing daemon 1034 */ 1035 sin6.sin6_addr = ip6->ip6_src; 1036 1037 im = mtod(mm, struct mrt6msg *); 1038 im->im6_msgtype = MRT6MSG_NOCACHE; 1039 im->im6_mbz = 0; 1040 1041 #ifdef MRT6DEBUG 1042 if (mrt6debug & DEBUG_FORWARD) 1043 log(LOG_DEBUG, 1044 "getting the iif info in the kernel\n"); 1045 #endif 1046 1047 for (mifp = mif6table, mifi = 0; 1048 mifi < nummifs && mifp->m6_ifp != ifp; 1049 mifp++, mifi++) 1050 ; 1051 1052 im->im6_mif = mifi; 1053 1054 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1055 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1056 "socket queue full\n"); 1057 mrt6stat.mrt6s_upq_sockfull++; 1058 free(rte, M_MRTABLE); 1059 m_freem(mb0); 1060 free(rt, M_MRTABLE); 1061 splx(s); 1062 return ENOBUFS; 1063 } 1064 1065 mrt6stat.mrt6s_upcalls++; 1066 1067 /* insert new entry at head of hash chain */ 1068 bzero(rt, sizeof(*rt)); 1069 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1070 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1071 rt->mf6c_expire = UPCALL_EXPIRE; 1072 nexpire[hash]++; 1073 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1074 1075 /* link into table */ 1076 rt->mf6c_next = mf6ctable[hash]; 1077 mf6ctable[hash] = rt; 1078 /* Add this entry to the end of the queue */ 1079 rt->mf6c_stall = rte; 1080 } else { 1081 /* determine if q has overflowed */ 1082 struct rtdetq **p; 1083 register int npkts = 0; 1084 1085 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1086 if (++npkts > MAX_UPQ6) { 1087 mrt6stat.mrt6s_upq_ovflw++; 1088 free(rte, M_MRTABLE); 1089 m_freem(mb0); 1090 splx(s); 1091 return 0; 1092 } 1093 1094 /* Add this entry to the end of the queue */ 1095 *p = rte; 1096 } 1097 1098 rte->next = NULL; 1099 rte->m = mb0; 1100 rte->ifp = ifp; 1101 #ifdef UPCALL_TIMING 1102 rte->t = tp; 1103 #endif /* UPCALL_TIMING */ 1104 1105 splx(s); 1106 1107 return 0; 1108 } 1109 } 1110 1111 /* 1112 * Clean up cache entries if upcalls are not serviced 1113 * Call from the Slow Timeout mechanism, every half second. 1114 */ 1115 static void 1116 expire_upcalls(unused) 1117 void *unused; 1118 { 1119 struct rtdetq *rte; 1120 struct mf6c *mfc, **nptr; 1121 int i; 1122 int s; 1123 1124 s = splsoftnet(); 1125 for (i = 0; i < MF6CTBLSIZ; i++) { 1126 if (nexpire[i] == 0) 1127 continue; 1128 nptr = &mf6ctable[i]; 1129 while ((mfc = *nptr) != NULL) { 1130 rte = mfc->mf6c_stall; 1131 /* 1132 * Skip real cache entries 1133 * Make sure it wasn't marked to not expire (shouldn't happen) 1134 * If it expires now 1135 */ 1136 if (rte != NULL && 1137 mfc->mf6c_expire != 0 && 1138 --mfc->mf6c_expire == 0) { 1139 #ifdef MRT6DEBUG 1140 if (mrt6debug & DEBUG_EXPIRE) 1141 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1142 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1143 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1144 #endif 1145 /* 1146 * drop all the packets 1147 * free the mbuf with the pkt, if, timing info 1148 */ 1149 do { 1150 struct rtdetq *n = rte->next; 1151 m_freem(rte->m); 1152 free(rte, M_MRTABLE); 1153 rte = n; 1154 } while (rte != NULL); 1155 mrt6stat.mrt6s_cache_cleanups++; 1156 nexpire[i]--; 1157 1158 *nptr = mfc->mf6c_next; 1159 free(mfc, M_MRTABLE); 1160 } else { 1161 nptr = &mfc->mf6c_next; 1162 } 1163 } 1164 } 1165 splx(s); 1166 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 1167 } 1168 1169 /* 1170 * Packet forwarding routine once entry in the cache is made 1171 */ 1172 static int 1173 ip6_mdq(m, ifp, rt) 1174 register struct mbuf *m; 1175 register struct ifnet *ifp; 1176 register struct mf6c *rt; 1177 { 1178 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1179 register mifi_t mifi, iif; 1180 register struct mif6 *mifp; 1181 register int plen = m->m_pkthdr.len; 1182 1183 /* 1184 * Macro to send packet on mif. Since RSVP packets don't get counted on 1185 * input, they shouldn't get counted on output, so statistics keeping is 1186 * seperate. 1187 */ 1188 1189 #define MC6_SEND(ip6,mifp,m) { \ 1190 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1191 register_send((ip6), (mifp), (m)); \ 1192 else \ 1193 phyint_send((ip6), (mifp), (m)); \ 1194 } 1195 1196 /* 1197 * Don't forward if it didn't arrive from the parent mif 1198 * for its origin. 1199 */ 1200 mifi = rt->mf6c_parent; 1201 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1202 /* came in the wrong interface */ 1203 #ifdef MRT6DEBUG 1204 if (mrt6debug & DEBUG_FORWARD) 1205 log(LOG_DEBUG, 1206 "wrong if: ifid %d mifi %d mififid %x\n", 1207 ifp->if_index, mifi, 1208 mif6table[mifi].m6_ifp->if_index); 1209 #endif 1210 mrt6stat.mrt6s_wrong_if++; 1211 rt->mf6c_wrong_if++; 1212 /* 1213 * If we are doing PIM processing, and we are forwarding 1214 * packets on this interface, send a message to the 1215 * routing daemon. 1216 */ 1217 if(mifi < nummifs) /* have to make sure this is a valid mif */ 1218 if(mif6table[mifi].m6_ifp) 1219 1220 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1221 /* 1222 * Check the M_LOOP flag to avoid an 1223 * unnecessary PIM assert. 1224 * XXX: M_LOOP is an ad-hoc hack... 1225 */ 1226 static struct sockaddr_in6 sin6 = 1227 { sizeof(sin6), AF_INET6 }; 1228 1229 register struct mbuf *mm; 1230 struct mrt6msg *im; 1231 1232 mm = m_copy(m, 0, 1233 sizeof(struct ip6_hdr)); 1234 if (mm && 1235 (M_HASCL(mm) || 1236 mm->m_len < sizeof(struct ip6_hdr))) 1237 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1238 if (mm == NULL) 1239 return ENOBUFS; 1240 1241 im = mtod(mm, struct mrt6msg *); 1242 im->im6_msgtype = MRT6MSG_WRONGMIF; 1243 im->im6_mbz = 0; 1244 1245 for (mifp = mif6table, iif = 0; 1246 iif < nummifs && mifp && 1247 mifp->m6_ifp != ifp; 1248 mifp++, iif++); 1249 1250 im->im6_mif = iif; 1251 1252 sin6.sin6_addr = im->im6_src; 1253 1254 mrt6stat.mrt6s_upcalls++; 1255 1256 if (socket_send(ip6_mrouter, mm, 1257 &sin6) < 0) { 1258 #ifdef MRT6DEBUG 1259 if (mrt6debug) 1260 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1261 #endif 1262 ++mrt6stat.mrt6s_upq_sockfull; 1263 return ENOBUFS; 1264 } /* if socket Q full */ 1265 } /* if PIM */ 1266 return 0; 1267 } /* if wrong iif */ 1268 1269 /* If I sourced this packet, it counts as output, else it was input. */ 1270 if (m->m_pkthdr.rcvif == NULL) { 1271 /* XXX: is rcvif really NULL when output?? */ 1272 mif6table[mifi].m6_pkt_out++; 1273 mif6table[mifi].m6_bytes_out += plen; 1274 } else { 1275 mif6table[mifi].m6_pkt_in++; 1276 mif6table[mifi].m6_bytes_in += plen; 1277 } 1278 rt->mf6c_pkt_cnt++; 1279 rt->mf6c_byte_cnt += plen; 1280 1281 /* 1282 * For each mif, forward a copy of the packet if there are group 1283 * members downstream on the interface. 1284 */ 1285 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1286 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1287 mifp->m6_pkt_out++; 1288 mifp->m6_bytes_out += plen; 1289 MC6_SEND(ip6, mifp, m); 1290 } 1291 return 0; 1292 } 1293 1294 static void 1295 phyint_send(ip6, mifp, m) 1296 struct ip6_hdr *ip6; 1297 struct mif6 *mifp; 1298 struct mbuf *m; 1299 { 1300 register struct mbuf *mb_copy; 1301 struct ifnet *ifp = mifp->m6_ifp; 1302 int error = 0; 1303 int s = splsoftnet(); 1304 static struct route_in6 ro6; 1305 struct in6_multi *in6m; 1306 1307 /* 1308 * Make a new reference to the packet; make sure that 1309 * the IPv6 header is actually copied, not just referenced, 1310 * so that ip6_output() only scribbles on the copy. 1311 */ 1312 mb_copy = m_copy(m, 0, M_COPYALL); 1313 if (mb_copy && 1314 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1315 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1316 if (mb_copy == NULL) 1317 return; 1318 /* set MCAST flag to the outgoing packet */ 1319 mb_copy->m_flags |= M_MCAST; 1320 1321 /* 1322 * If we sourced the packet, call ip6_output since we may devide 1323 * the packet into fragments when the packet is too big for the 1324 * outgoing interface. 1325 * Otherwise, we can simply send the packet to the interface 1326 * sending queue. 1327 */ 1328 if (m->m_pkthdr.rcvif == NULL) { 1329 struct ip6_moptions im6o; 1330 1331 im6o.im6o_multicast_ifp = ifp; 1332 /* XXX: ip6_output will override ip6->ip6_hlim */ 1333 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1334 im6o.im6o_multicast_loop = 1; 1335 error = ip6_output(mb_copy, NULL, &ro6, 1336 IPV6_FORWARDING, &im6o); 1337 1338 #ifdef MRT6DEBUG 1339 if (mrt6debug & DEBUG_XMIT) 1340 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1341 mifp - mif6table, error); 1342 #endif 1343 splx(s); 1344 return; 1345 } 1346 1347 /* 1348 * If we belong to the destination multicast group 1349 * on the outgoing interface, loop back a copy. 1350 */ 1351 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1352 if (in6m != NULL) { 1353 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1354 ro6.ro_dst.sin6_family = AF_INET6; 1355 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1356 ip6_mloopback(ifp, m, &ro6.ro_dst); 1357 } 1358 /* 1359 * Put the packet into the sending queue of the outgoing interface 1360 * if it would fit in the MTU of the interface. 1361 */ 1362 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1363 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1364 ro6.ro_dst.sin6_family = AF_INET6; 1365 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1366 error = (*ifp->if_output)(ifp, mb_copy, 1367 (struct sockaddr *)&ro6.ro_dst, 1368 NULL); 1369 #ifdef MRT6DEBUG 1370 if (mrt6debug & DEBUG_XMIT) 1371 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1372 mifp - mif6table, error); 1373 #endif 1374 } 1375 else { 1376 #ifdef MULTICAST_PMTUD 1377 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1378 return; 1379 #else 1380 #ifdef MRT6DEBUG 1381 #ifdef __NetBSD__ 1382 if (mrt6debug & DEBUG_DEBUG_XMIT) 1383 log(LOG_DEBUG, 1384 "phyint_send: packet too big on %s o %s g %s" 1385 " size %d(discarded)\n", 1386 ifp->if_xname, 1387 ip6_sprintf(&ip6->ip6_src), 1388 ip6_sprintf(&ip6->ip6_dst), 1389 mb_copy->m_pkthdr.len); 1390 #else 1391 if (mrt6debug & DEBUG_XMIT) 1392 log(LOG_DEBUG, 1393 "phyint_send: packet too big on %s%u o %s g %s" 1394 " size %d(discarded)\n", 1395 ifp->if_name, ifp->if_unit, 1396 ip6_sprintf(&ip6->ip6_src), 1397 ip6_sprintf(&ip6->ip6_dst), 1398 mb_copy->m_pkthdr.len); 1399 #endif /* __NetBSD__ */ 1400 #endif /* MRT6DEBUG */ 1401 m_freem(mb_copy); /* simply discard the packet */ 1402 return; 1403 #endif 1404 } 1405 } 1406 1407 static int 1408 register_send(ip6, mif, m) 1409 register struct ip6_hdr *ip6; 1410 struct mif6 *mif; 1411 register struct mbuf *m; 1412 { 1413 register struct mbuf *mm; 1414 register int i, len = m->m_pkthdr.len; 1415 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1416 struct mrt6msg *im6; 1417 1418 #ifdef MRT6DEBUG 1419 if (mrt6debug) 1420 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1421 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1422 #endif 1423 ++pim6stat.pim6s_snd_registers; 1424 1425 /* Make a copy of the packet to send to the user level process */ 1426 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1427 if (mm == NULL) 1428 return ENOBUFS; 1429 mm->m_data += max_linkhdr; 1430 mm->m_len = sizeof(struct ip6_hdr); 1431 1432 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1433 m_freem(mm); 1434 return ENOBUFS; 1435 } 1436 i = MHLEN - M_LEADINGSPACE(mm); 1437 if (i > len) 1438 i = len; 1439 mm = m_pullup(mm, i); 1440 if (mm == NULL){ 1441 m_freem(mm); 1442 return ENOBUFS; 1443 } 1444 /* TODO: check it! */ 1445 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1446 1447 /* 1448 * Send message to routing daemon 1449 */ 1450 sin6.sin6_addr = ip6->ip6_src; 1451 1452 im6 = mtod(mm, struct mrt6msg *); 1453 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1454 im6->im6_mbz = 0; 1455 1456 im6->im6_mif = mif - mif6table; 1457 1458 /* iif info is not given for reg. encap.n */ 1459 mrt6stat.mrt6s_upcalls++; 1460 1461 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1462 #ifdef MRT6DEBUG 1463 if (mrt6debug) 1464 log(LOG_WARNING, 1465 "register_send: ip_mrouter socket queue full\n"); 1466 #endif 1467 ++mrt6stat.mrt6s_upq_sockfull; 1468 return ENOBUFS; 1469 } 1470 return 0; 1471 } 1472 1473 /* 1474 * PIM sparse mode hook 1475 * Receives the pim control messages, and passes them up to the listening 1476 * socket, using rip6_input. 1477 * The only message processed is the REGISTER pim message; the pim header 1478 * is stripped off, and the inner packet is passed to register_mforward. 1479 */ 1480 int 1481 pim6_input(mp, offp, proto) 1482 struct mbuf **mp; 1483 int *offp, proto; 1484 { 1485 register struct pim *pim; /* pointer to a pim struct */ 1486 register struct ip6_hdr *ip6; 1487 register int pimlen; 1488 struct mbuf *m = *mp; 1489 int minlen; 1490 int off = *offp; 1491 1492 ++pim6stat.pim6s_rcv_total; 1493 1494 ip6 = mtod(m, struct ip6_hdr *); 1495 pimlen = m->m_pkthdr.len - *offp; 1496 1497 /* 1498 * Validate lengths 1499 */ 1500 if (pimlen < PIM_MINLEN) { 1501 ++pim6stat.pim6s_rcv_tooshort; 1502 #ifdef MRT6DEBUG 1503 if (mrt6debug & DEBUG_PIM) 1504 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1505 #endif 1506 m_freem(m); 1507 return(IPPROTO_DONE); 1508 } 1509 1510 /* 1511 * if the packet is at least as big as a REGISTER, go ahead 1512 * and grab the PIM REGISTER header size, to avoid another 1513 * possible m_pullup() later. 1514 * 1515 * PIM_MINLEN == pimhdr + u_int32 == 8 1516 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1517 */ 1518 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1519 1520 /* 1521 * Make sure that the IP6 and PIM headers in contiguous memory, and 1522 * possibly the PIM REGISTER header 1523 */ 1524 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1525 /* adjust pointer */ 1526 ip6 = mtod(m, struct ip6_hdr *); 1527 1528 /* adjust mbuf to point to the PIM header */ 1529 pim = (struct pim *)((caddr_t)ip6 + off); 1530 1531 #define PIM6_CHECKSUM 1532 #ifdef PIM6_CHECKSUM 1533 { 1534 int cksumlen; 1535 1536 /* 1537 * Validate checksum. 1538 * If PIM REGISTER, exclude the data packet 1539 */ 1540 if (pim->pim_type == PIM_REGISTER) 1541 cksumlen = PIM_MINLEN; 1542 else 1543 cksumlen = pimlen; 1544 1545 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1546 ++pim6stat.pim6s_rcv_badsum; 1547 #ifdef MRT6DEBUG 1548 if (mrt6debug & DEBUG_PIM) 1549 log(LOG_DEBUG, 1550 "pim6_input: invalid checksum\n"); 1551 #endif 1552 m_freem(m); 1553 return(IPPROTO_DONE); 1554 } 1555 } 1556 #endif /* PIM_CHECKSUM */ 1557 1558 /* PIM version check */ 1559 if (pim->pim_ver != PIM_VERSION) { 1560 ++pim6stat.pim6s_rcv_badversion; 1561 #ifdef MRT6DEBUG 1562 log(LOG_ERR, 1563 "pim6_input: incorrect version %d, expecting %d\n", 1564 pim->pim_ver, PIM_VERSION); 1565 #endif 1566 m_freem(m); 1567 return(IPPROTO_DONE); 1568 } 1569 1570 if (pim->pim_type == PIM_REGISTER) { 1571 /* 1572 * since this is a REGISTER, we'll make a copy of the register 1573 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1574 * routing daemon. 1575 */ 1576 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1577 1578 struct mbuf *mcp; 1579 struct ip6_hdr *eip6; 1580 u_int32_t *reghdr; 1581 int rc; 1582 1583 ++pim6stat.pim6s_rcv_registers; 1584 1585 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1586 #ifdef MRT6DEBUG 1587 if (mrt6debug & DEBUG_PIM) 1588 log(LOG_DEBUG, 1589 "pim6_input: register mif not set: %d\n", 1590 reg_mif_num); 1591 #endif 1592 m_freem(m); 1593 return(IPPROTO_DONE); 1594 } 1595 1596 reghdr = (u_int32_t *)(pim + 1); 1597 1598 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1599 goto pim6_input_to_daemon; 1600 1601 /* 1602 * Validate length 1603 */ 1604 if (pimlen < PIM6_REG_MINLEN) { 1605 ++pim6stat.pim6s_rcv_tooshort; 1606 ++pim6stat.pim6s_rcv_badregisters; 1607 #ifdef MRT6DEBUG 1608 log(LOG_ERR, 1609 "pim6_input: register packet size too " 1610 "small %d from %s\n", 1611 pimlen, ip6_sprintf(&ip6->ip6_src)); 1612 #endif 1613 m_freem(m); 1614 return(IPPROTO_DONE); 1615 } 1616 1617 eip6 = (struct ip6_hdr *) (reghdr + 1); 1618 #ifdef MRT6DEBUG 1619 if (mrt6debug & DEBUG_PIM) 1620 log(LOG_DEBUG, 1621 "pim6_input[register], eip6: %s -> %s, " 1622 "eip6 plen %d\n", 1623 ip6_sprintf(&eip6->ip6_src), 1624 ip6_sprintf(&eip6->ip6_dst), 1625 ntohs(eip6->ip6_plen)); 1626 #endif 1627 1628 /* verify the inner packet is destined to a mcast group */ 1629 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1630 ++pim6stat.pim6s_rcv_badregisters; 1631 #ifdef MRT6DEBUG 1632 if (mrt6debug & DEBUG_PIM) 1633 log(LOG_DEBUG, 1634 "pim6_input: inner packet of register " 1635 "is not multicast %s\n", 1636 ip6_sprintf(&eip6->ip6_dst)); 1637 #endif 1638 m_freem(m); 1639 return(IPPROTO_DONE); 1640 } 1641 1642 /* 1643 * make a copy of the whole header to pass to the daemon later. 1644 */ 1645 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1646 if (mcp == NULL) { 1647 #ifdef MRT6DEBUG 1648 log(LOG_ERR, 1649 "pim6_input: pim register: " 1650 "could not copy register head\n"); 1651 #endif 1652 m_freem(m); 1653 return(IPPROTO_DONE); 1654 } 1655 1656 /* 1657 * forward the inner ip6 packet; point m_data at the inner ip6. 1658 */ 1659 m_adj(m, off + PIM_MINLEN); 1660 #ifdef MRT6DEBUG 1661 if (mrt6debug & DEBUG_PIM) { 1662 log(LOG_DEBUG, 1663 "pim6_input: forwarding decapsulated register: " 1664 "src %s, dst %s, mif %d\n", 1665 ip6_sprintf(&eip6->ip6_src), 1666 ip6_sprintf(&eip6->ip6_dst), 1667 reg_mif_num); 1668 } 1669 #endif 1670 1671 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1672 (struct sockaddr *) &dst, 1673 (struct rtentry *) NULL); 1674 1675 /* prepare the register head to send to the mrouting daemon */ 1676 m = mcp; 1677 } 1678 1679 /* 1680 * Pass the PIM message up to the daemon; if it is a register message 1681 * pass the 'head' only up to the daemon. This includes the 1682 * encapsulator ip6 header, pim header, register header and the 1683 * encapsulated ip6 header. 1684 */ 1685 pim6_input_to_daemon: 1686 rip6_input(&m, offp, proto); 1687 return(IPPROTO_DONE); 1688 } 1689
Indexes created Wed Sep 24 05:09:52 GMT 2025