ip6_mroute.c revision 1.10
1 /* $NetBSD: ip6_mroute.c,v 1.10 2000/02/06 12:49:45 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 #include "opt_inet.h" 48 49 #ifndef _KERNEL 50 # ifdef KERNEL 51 # define _KERNEL 52 # endif 53 #endif 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/mbuf.h> 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/sockio.h> 61 #include <sys/protosw.h> 62 #include <sys/errno.h> 63 #include <sys/time.h> 64 #include <sys/kernel.h> 65 #include <sys/ioctl.h> 66 #include <sys/syslog.h> 67 68 #include <net/if.h> 69 #include <net/route.h> 70 #include <net/raw_cb.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 #define M_HASCL(m) ((m)->m_flags & M_EXT) 82 83 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 84 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 85 86 static int set_pim6 __P((int *)); 87 static int get_pim6 __P((struct mbuf *)); 88 static int socket_send __P((struct socket *, struct mbuf *, 89 struct sockaddr_in6 *)); 90 static int register_send __P((struct ip6_hdr *, struct mif6 *, 91 struct mbuf *)); 92 93 /* 94 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 95 * except for netstat or debugging purposes. 96 */ 97 struct socket *ip6_mrouter = NULL; 98 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 99 struct mrt6stat mrt6stat; 100 101 #define NO_RTE_FOUND 0x1 102 #define RTE_FOUND 0x2 103 104 struct mf6c *mf6ctable[MF6CTBLSIZ]; 105 u_char nexpire[MF6CTBLSIZ]; 106 static struct mif6 mif6table[MAXMIFS]; 107 #ifdef MRT6DEBUG 108 u_int mrt6debug = 0; /* debug level */ 109 #define DEBUG_MFC 0x02 110 #define DEBUG_FORWARD 0x04 111 #define DEBUG_EXPIRE 0x08 112 #define DEBUG_XMIT 0x10 113 #define DEBUG_REG 0x20 114 #define DEBUG_PIM 0x40 115 #endif 116 117 static void expire_upcalls __P((void *)); 118 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 119 #define UPCALL_EXPIRE 6 /* number of timeouts */ 120 121 #ifdef INET 122 #ifdef MROUTING 123 extern struct socket *ip_mrouter; 124 #endif 125 #endif 126 127 /* 128 * 'Interfaces' associated with decapsulator (so we can tell 129 * packets that went through it from ones that get reflected 130 * by a broken gateway). These interfaces are never linked into 131 * the system ifnet list & no routes point to them. I.e., packets 132 * can't be sent this way. They only exist as a placeholder for 133 * multicast source verification. 134 */ 135 struct ifnet multicast_register_if; 136 137 #define ENCAP_HOPS 64 138 139 /* 140 * Private variables. 141 */ 142 static mifi_t nummifs = 0; 143 static mifi_t reg_mif_num = (mifi_t)-1; 144 145 static struct pim6stat pim6stat; 146 147 /* 148 * one-back cache used by ipip_input to locate a tunnel's mif 149 * given a datagram's src ip address. 150 */ 151 static int pim6; 152 153 /* 154 * Hash function for a source, group entry 155 */ 156 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 157 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 158 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 159 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 160 161 /* 162 * Find a route for a given origin IPv6 address and Multicast group address. 163 * Quality of service parameter to be added in the future!!! 164 */ 165 166 #define MF6CFIND(o, g, rt) { \ 167 register struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 168 rt = NULL; \ 169 mrt6stat.mrt6s_mfc_lookups++; \ 170 while (_rt) { \ 171 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 172 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 173 (_rt->mf6c_stall == NULL)) { \ 174 rt = _rt; \ 175 break; \ 176 } \ 177 _rt = _rt->mf6c_next; \ 178 } \ 179 if (rt == NULL) { \ 180 mrt6stat.mrt6s_mfc_misses++; \ 181 } \ 182 } 183 184 /* 185 * Macros to compute elapsed time efficiently 186 * Borrowed from Van Jacobson's scheduling code 187 */ 188 #define TV_DELTA(a, b, delta) { \ 189 register int xxs; \ 190 \ 191 delta = (a).tv_usec - (b).tv_usec; \ 192 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 193 switch (xxs) { \ 194 case 2: \ 195 delta += 1000000; \ 196 /* fall through */ \ 197 case 1: \ 198 delta += 1000000; \ 199 break; \ 200 default: \ 201 delta += (1000000 * xxs); \ 202 } \ 203 } \ 204 } 205 206 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 207 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 208 209 #ifdef UPCALL_TIMING 210 #define UPCALL_MAX 50 211 u_long upcall_data[UPCALL_MAX + 1]; 212 static void collate(); 213 #endif /* UPCALL_TIMING */ 214 215 static int get_sg_cnt __P((struct sioc_sg_req6 *)); 216 static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 217 static int ip6_mrouter_init __P((struct socket *, struct mbuf *)); 218 static int add_m6if __P((struct mif6ctl *)); 219 static int del_m6if __P((mifi_t *)); 220 static int add_m6fc __P((struct mf6cctl *)); 221 static int del_m6fc __P((struct mf6cctl *)); 222 223 /* 224 * Handle MRT setsockopt commands to modify the multicast routing tables. 225 */ 226 int 227 ip6_mrouter_set(cmd, so, m) 228 int cmd; 229 struct socket *so; 230 struct mbuf *m; 231 { 232 if (cmd != MRT6_INIT && so != ip6_mrouter) 233 return EACCES; 234 235 switch (cmd) { 236 case MRT6_INIT: return ip6_mrouter_init(so, m); 237 case MRT6_DONE: return ip6_mrouter_done(); 238 case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); 239 case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); 240 case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); 241 case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); 242 case MRT6_PIM: return set_pim6(mtod(m, int *)); 243 default: return EOPNOTSUPP; 244 } 245 } 246 247 /* 248 * Handle MRT getsockopt commands 249 */ 250 int 251 ip6_mrouter_get(cmd, so, m) 252 int cmd; 253 struct socket *so; 254 struct mbuf **m; 255 { 256 struct mbuf *mb; 257 258 if (so != ip6_mrouter) return EACCES; 259 260 *m = mb = m_get(M_WAIT, MT_SOOPTS); 261 262 switch (cmd) { 263 case MRT6_PIM: return get_pim6(mb); 264 default: 265 m_free(mb); 266 return EOPNOTSUPP; 267 } 268 } 269 270 /* 271 * Handle ioctl commands to obtain information from the cache 272 */ 273 int 274 mrt6_ioctl(cmd, data) 275 int cmd; 276 caddr_t data; 277 { 278 int error = 0; 279 280 switch (cmd) { 281 case SIOCGETSGCNT_IN6: 282 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 283 break; /* for safety */ 284 case SIOCGETMIFCNT_IN6: 285 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 286 break; /* for safety */ 287 default: 288 return (EINVAL); 289 break; 290 } 291 return error; 292 } 293 294 /* 295 * returns the packet, byte, rpf-failure count for the source group provided 296 */ 297 static int 298 get_sg_cnt(req) 299 register struct sioc_sg_req6 *req; 300 { 301 register struct mf6c *rt; 302 int s; 303 304 s = splsoftnet(); 305 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 306 splx(s); 307 if (rt != NULL) { 308 req->pktcnt = rt->mf6c_pkt_cnt; 309 req->bytecnt = rt->mf6c_byte_cnt; 310 req->wrong_if = rt->mf6c_wrong_if; 311 } else 312 return(ESRCH); 313 #if 0 314 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 315 #endif 316 317 return 0; 318 } 319 320 /* 321 * returns the input and output packet and byte counts on the mif provided 322 */ 323 static int 324 get_mif6_cnt(req) 325 register struct sioc_mif_req6 *req; 326 { 327 register mifi_t mifi = req->mifi; 328 329 if (mifi >= nummifs) 330 return EINVAL; 331 332 req->icount = mif6table[mifi].m6_pkt_in; 333 req->ocount = mif6table[mifi].m6_pkt_out; 334 req->ibytes = mif6table[mifi].m6_bytes_in; 335 req->obytes = mif6table[mifi].m6_bytes_out; 336 337 return 0; 338 } 339 340 /* 341 * Get PIM processiong global 342 */ 343 static int 344 get_pim6(m) 345 struct mbuf *m; 346 { 347 int *i; 348 349 i = mtod(m, int *); 350 351 *i = pim6; 352 353 return 0; 354 } 355 356 static int 357 set_pim6(i) 358 int *i; 359 { 360 if ((*i != 1) && (*i != 0)) 361 return EINVAL; 362 363 pim6 = *i; 364 365 return 0; 366 } 367 368 /* 369 * Enable multicast routing 370 */ 371 static int 372 ip6_mrouter_init(so, m) 373 struct socket *so; 374 struct mbuf *m; 375 { 376 int *v; 377 378 #ifdef MRT6DEBUG 379 if (mrt6debug) 380 log(LOG_DEBUG, 381 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 382 so->so_type, so->so_proto->pr_protocol); 383 #endif 384 385 if (so->so_type != SOCK_RAW || 386 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 387 return EOPNOTSUPP; 388 389 if (!m || (m->m_len != sizeof(int *))) 390 return ENOPROTOOPT; 391 392 v = mtod(m, int *); 393 if (*v != 1) 394 return ENOPROTOOPT; 395 396 if (ip6_mrouter != NULL) return EADDRINUSE; 397 398 ip6_mrouter = so; 399 400 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 401 bzero((caddr_t)nexpire, sizeof(nexpire)); 402 403 pim6 = 0;/* used for stubbing out/in pim stuff */ 404 405 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 406 407 #ifdef MRT6DEBUG 408 if (mrt6debug) 409 log(LOG_DEBUG, "ip6_mrouter_init\n"); 410 #endif 411 412 return 0; 413 } 414 415 /* 416 * Disable multicast routing 417 */ 418 int 419 ip6_mrouter_done() 420 { 421 mifi_t mifi; 422 int i; 423 struct ifnet *ifp; 424 struct in6_ifreq ifr; 425 struct mf6c *rt; 426 struct rtdetq *rte; 427 int s; 428 429 s = splsoftnet(); 430 431 /* 432 * For each phyint in use, disable promiscuous reception of all IPv6 433 * multicasts. 434 */ 435 #ifdef INET 436 #ifdef MROUTING 437 /* 438 * If there is still IPv4 multicast routing daemon, 439 * we remain interfaces to receive all muliticasted packets. 440 * XXX: there may be an interface in which the IPv4 multicast 441 * daemon is not interested... 442 */ 443 if (!ip_mrouter) 444 #endif 445 #endif 446 { 447 for (mifi = 0; mifi < nummifs; mifi++) { 448 if (mif6table[mifi].m6_ifp && 449 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 450 ifr.ifr_addr.sin6_family = AF_INET6; 451 ifr.ifr_addr.sin6_addr= in6addr_any; 452 ifp = mif6table[mifi].m6_ifp; 453 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 454 (caddr_t)&ifr); 455 } 456 } 457 } 458 #ifdef notyet 459 bzero((caddr_t)qtable, sizeof(qtable)); 460 bzero((caddr_t)tbftable, sizeof(tbftable)); 461 #endif 462 bzero((caddr_t)mif6table, sizeof(mif6table)); 463 nummifs = 0; 464 465 pim6 = 0; /* used to stub out/in pim specific code */ 466 467 untimeout(expire_upcalls, (caddr_t)NULL); 468 469 /* 470 * Free all multicast forwarding cache entries. 471 */ 472 for (i = 0; i < MF6CTBLSIZ; i++) { 473 rt = mf6ctable[i]; 474 while (rt) { 475 struct mf6c *frt; 476 477 for (rte = rt->mf6c_stall; rte != NULL; ) { 478 struct rtdetq *n = rte->next; 479 480 m_free(rte->m); 481 free(rte, M_MRTABLE); 482 rte = n; 483 } 484 frt = rt; 485 rt = rt->mf6c_next; 486 free(frt, M_MRTABLE); 487 } 488 } 489 490 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 491 492 /* 493 * Reset de-encapsulation cache 494 */ 495 reg_mif_num = -1; 496 497 ip6_mrouter = NULL; 498 499 splx(s); 500 501 #ifdef MRT6DEBUG 502 if (mrt6debug) 503 log(LOG_DEBUG, "ip6_mrouter_done\n"); 504 #endif 505 506 return 0; 507 } 508 509 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 510 511 /* 512 * Add a mif to the mif table 513 */ 514 static int 515 add_m6if(mifcp) 516 register struct mif6ctl *mifcp; 517 { 518 register struct mif6 *mifp; 519 struct ifnet *ifp; 520 struct in6_ifreq ifr; 521 int error, s; 522 #ifdef notyet 523 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 524 #endif 525 526 if (mifcp->mif6c_mifi >= MAXMIFS) 527 return EINVAL; 528 mifp = mif6table + mifcp->mif6c_mifi; 529 if (mifp->m6_ifp) 530 return EADDRINUSE; /* XXX: is it appropriate? */ 531 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 532 return ENXIO; 533 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 534 535 if (mifcp->mif6c_flags & MIFF_REGISTER) { 536 if (reg_mif_num == (mifi_t)-1) { 537 strcpy(multicast_register_if.if_xname, 538 "register_mif"); /* XXX */ 539 multicast_register_if.if_flags |= IFF_LOOPBACK; 540 multicast_register_if.if_index = mifcp->mif6c_mifi; 541 reg_mif_num = mifcp->mif6c_mifi; 542 } 543 544 ifp = &multicast_register_if; 545 546 } /* if REGISTER */ 547 else { 548 /* Make sure the interface supports multicast */ 549 if ((ifp->if_flags & IFF_MULTICAST) == 0) 550 return EOPNOTSUPP; 551 552 s = splsoftnet(); 553 /* 554 * Enable promiscuous reception of all IPv6 multicasts 555 * from the interface. 556 */ 557 ifr.ifr_addr.sin6_family = AF_INET6; 558 ifr.ifr_addr.sin6_addr = in6addr_any; 559 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 560 splx(s); 561 if (error) 562 return error; 563 } 564 565 s = splsoftnet(); 566 mifp->m6_flags = mifcp->mif6c_flags; 567 mifp->m6_ifp = ifp; 568 #ifdef notyet 569 /* scaling up here allows division by 1024 in critical code */ 570 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 571 #endif 572 /* initialize per mif pkt counters */ 573 mifp->m6_pkt_in = 0; 574 mifp->m6_pkt_out = 0; 575 mifp->m6_bytes_in = 0; 576 mifp->m6_bytes_out = 0; 577 splx(s); 578 579 /* Adjust nummifs up if the mifi is higher than nummifs */ 580 if (nummifs <= mifcp->mif6c_mifi) 581 nummifs = mifcp->mif6c_mifi + 1; 582 583 #ifdef MRT6DEBUG 584 if (mrt6debug) 585 log(LOG_DEBUG, 586 "add_mif #%d, phyint %s%d\n", 587 mifcp->mif6c_mifi, 588 ifp->if_name, ifp->if_unit); 589 #endif 590 591 return 0; 592 } 593 594 /* 595 * Delete a mif from the mif table 596 */ 597 static int 598 del_m6if(mifip) 599 mifi_t *mifip; 600 { 601 register struct mif6 *mifp = mif6table + *mifip; 602 register mifi_t mifi; 603 struct ifnet *ifp; 604 struct in6_ifreq ifr; 605 int s; 606 607 if (*mifip >= nummifs) 608 return EINVAL; 609 if (mifp->m6_ifp == NULL) 610 return EINVAL; 611 612 s = splsoftnet(); 613 614 if (!(mifp->m6_flags & MIFF_REGISTER)) { 615 /* 616 * XXX: what if there is yet IPv4 multicast daemon 617 * using the interface? 618 */ 619 ifp = mifp->m6_ifp; 620 621 ifr.ifr_addr.sin6_family = AF_INET6; 622 ifr.ifr_addr.sin6_addr = in6addr_any; 623 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 624 } 625 626 #ifdef notyet 627 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 628 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 629 #endif 630 bzero((caddr_t)mifp, sizeof (*mifp)); 631 632 /* Adjust nummifs down */ 633 for (mifi = nummifs; mifi > 0; mifi--) 634 if (mif6table[mifi - 1].m6_ifp) 635 break; 636 nummifs = mifi; 637 638 splx(s); 639 640 #ifdef MRT6DEBUG 641 if (mrt6debug) 642 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 643 #endif 644 645 return 0; 646 } 647 648 /* 649 * Add an mfc entry 650 */ 651 static int 652 add_m6fc(mfccp) 653 struct mf6cctl *mfccp; 654 { 655 struct mf6c *rt; 656 u_long hash; 657 struct rtdetq *rte; 658 register u_short nstl; 659 int s; 660 661 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 662 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 663 664 /* If an entry already exists, just update the fields */ 665 if (rt) { 666 #ifdef MRT6DEBUG 667 if (mrt6debug & DEBUG_MFC) 668 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 669 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 670 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 671 mfccp->mf6cc_parent); 672 #endif 673 674 s = splsoftnet(); 675 rt->mf6c_parent = mfccp->mf6cc_parent; 676 rt->mf6c_ifset = mfccp->mf6cc_ifset; 677 splx(s); 678 return 0; 679 } 680 681 /* 682 * Find the entry for which the upcall was made and update 683 */ 684 s = splsoftnet(); 685 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 686 mfccp->mf6cc_mcastgrp.sin6_addr); 687 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 688 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 689 &mfccp->mf6cc_origin.sin6_addr) && 690 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 691 &mfccp->mf6cc_mcastgrp.sin6_addr) && 692 (rt->mf6c_stall != NULL)) { 693 694 if (nstl++) 695 log(LOG_ERR, 696 "add_m6fc: %s o %s g %s p %x dbx %p\n", 697 "multiple kernel entries", 698 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 699 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 700 mfccp->mf6cc_parent, rt->mf6c_stall); 701 702 #ifdef MRT6DEBUG 703 if (mrt6debug & DEBUG_MFC) 704 log(LOG_DEBUG, 705 "add_m6fc o %s g %s p %x dbg %x\n", 706 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 707 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 708 mfccp->mf6cc_parent, rt->mf6c_stall); 709 #endif 710 711 rt->mf6c_origin = mfccp->mf6cc_origin; 712 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 713 rt->mf6c_parent = mfccp->mf6cc_parent; 714 rt->mf6c_ifset = mfccp->mf6cc_ifset; 715 /* initialize pkt counters per src-grp */ 716 rt->mf6c_pkt_cnt = 0; 717 rt->mf6c_byte_cnt = 0; 718 rt->mf6c_wrong_if = 0; 719 720 rt->mf6c_expire = 0; /* Don't clean this guy up */ 721 nexpire[hash]--; 722 723 /* free packets Qed at the end of this entry */ 724 for (rte = rt->mf6c_stall; rte != NULL; ) { 725 struct rtdetq *n = rte->next; 726 ip6_mdq(rte->m, rte->ifp, rt); 727 m_freem(rte->m); 728 #ifdef UPCALL_TIMING 729 collate(&(rte->t)); 730 #endif /* UPCALL_TIMING */ 731 free(rte, M_MRTABLE); 732 rte = n; 733 } 734 rt->mf6c_stall = NULL; 735 } 736 } 737 738 /* 739 * It is possible that an entry is being inserted without an upcall 740 */ 741 if (nstl == 0) { 742 #ifdef MRT6DEBUG 743 if (mrt6debug & DEBUG_MFC) 744 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 745 hash, 746 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 747 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 748 mfccp->mf6cc_parent); 749 #endif 750 751 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 752 753 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 754 &mfccp->mf6cc_origin.sin6_addr)&& 755 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 756 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 757 758 rt->mf6c_origin = mfccp->mf6cc_origin; 759 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 760 rt->mf6c_parent = mfccp->mf6cc_parent; 761 /* initialize pkt counters per src-grp */ 762 rt->mf6c_pkt_cnt = 0; 763 rt->mf6c_byte_cnt = 0; 764 rt->mf6c_wrong_if = 0; 765 766 if (rt->mf6c_expire) 767 nexpire[hash]--; 768 rt->mf6c_expire = 0; 769 } 770 } 771 if (rt == NULL) { 772 /* no upcall, so make a new entry */ 773 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 774 M_NOWAIT); 775 if (rt == NULL) { 776 splx(s); 777 return ENOBUFS; 778 } 779 780 /* insert new entry at head of hash chain */ 781 rt->mf6c_origin = mfccp->mf6cc_origin; 782 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 783 rt->mf6c_parent = mfccp->mf6cc_parent; 784 /* initialize pkt counters per src-grp */ 785 rt->mf6c_pkt_cnt = 0; 786 rt->mf6c_byte_cnt = 0; 787 rt->mf6c_wrong_if = 0; 788 rt->mf6c_expire = 0; 789 rt->mf6c_stall = NULL; 790 791 /* link into table */ 792 rt->mf6c_next = mf6ctable[hash]; 793 mf6ctable[hash] = rt; 794 } 795 } 796 splx(s); 797 return 0; 798 } 799 800 #ifdef UPCALL_TIMING 801 /* 802 * collect delay statistics on the upcalls 803 */ 804 static void 805 collate(t) 806 register struct timeval *t; 807 { 808 register u_long d; 809 register struct timeval tp; 810 register u_long delta; 811 812 GET_TIME(tp); 813 814 if (TV_LT(*t, tp)) 815 { 816 TV_DELTA(tp, *t, delta); 817 818 d = delta >> 10; 819 if (d > UPCALL_MAX) 820 d = UPCALL_MAX; 821 822 ++upcall_data[d]; 823 } 824 } 825 #endif /* UPCALL_TIMING */ 826 827 /* 828 * Delete an mfc entry 829 */ 830 static int 831 del_m6fc(mfccp) 832 struct mf6cctl *mfccp; 833 { 834 struct sockaddr_in6 origin; 835 struct sockaddr_in6 mcastgrp; 836 struct mf6c *rt; 837 struct mf6c **nptr; 838 u_long hash; 839 int s; 840 841 origin = mfccp->mf6cc_origin; 842 mcastgrp = mfccp->mf6cc_mcastgrp; 843 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 844 845 #ifdef MRT6DEBUG 846 if (mrt6debug & DEBUG_MFC) 847 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 848 ip6_sprintf(&origin.sin6_addr), 849 ip6_sprintf(&mcastgrp.sin6_addr)); 850 #endif 851 852 s = splsoftnet(); 853 854 nptr = &mf6ctable[hash]; 855 while ((rt = *nptr) != NULL) { 856 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 857 &rt->mf6c_origin.sin6_addr) && 858 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 859 &rt->mf6c_mcastgrp.sin6_addr) && 860 rt->mf6c_stall == NULL) 861 break; 862 863 nptr = &rt->mf6c_next; 864 } 865 if (rt == NULL) { 866 splx(s); 867 return EADDRNOTAVAIL; 868 } 869 870 *nptr = rt->mf6c_next; 871 free(rt, M_MRTABLE); 872 873 splx(s); 874 875 return 0; 876 } 877 878 static int 879 socket_send(s, mm, src) 880 struct socket *s; 881 struct mbuf *mm; 882 struct sockaddr_in6 *src; 883 { 884 if (s) { 885 if (sbappendaddr(&s->so_rcv, 886 (struct sockaddr *)src, 887 mm, (struct mbuf *)0) != 0) { 888 sorwakeup(s); 889 return 0; 890 } 891 } 892 m_freem(mm); 893 return -1; 894 } 895 896 /* 897 * IPv6 multicast forwarding function. This function assumes that the packet 898 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 899 * pointed to by "ifp", and the packet is to be relayed to other networks 900 * that have members of the packet's destination IPv6 multicast group. 901 * 902 * The packet is returned unscathed to the caller, unless it is 903 * erroneous, in which case a non-zero return value tells the caller to 904 * discard it. 905 */ 906 907 int 908 ip6_mforward(ip6, ifp, m) 909 register struct ip6_hdr *ip6; 910 struct ifnet *ifp; 911 struct mbuf *m; 912 { 913 register struct mf6c *rt; 914 register struct mif6 *mifp; 915 register struct mbuf *mm; 916 int s; 917 mifi_t mifi; 918 919 #ifdef MRT6DEBUG 920 if (mrt6debug & DEBUG_FORWARD) 921 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 922 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 923 ifp->if_index); 924 #endif 925 926 /* 927 * Don't forward a packet with Hop limit of zero or one, 928 * or a packet destined to a local-only group. 929 */ 930 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 931 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 932 return 0; 933 ip6->ip6_hlim--; 934 935 /* 936 * Determine forwarding mifs from the forwarding cache table 937 */ 938 s = splsoftnet(); 939 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 940 941 /* Entry exists, so forward if necessary */ 942 if (rt) { 943 splx(s); 944 return (ip6_mdq(m, ifp, rt)); 945 } else { 946 /* 947 * If we don't have a route for packet's origin, 948 * Make a copy of the packet & 949 * send message to routing daemon 950 */ 951 952 register struct mbuf *mb0; 953 register struct rtdetq *rte; 954 register u_long hash; 955 /* register int i, npkts;*/ 956 #ifdef UPCALL_TIMING 957 struct timeval tp; 958 959 GET_TIME(tp); 960 #endif /* UPCALL_TIMING */ 961 962 mrt6stat.mrt6s_no_route++; 963 #ifdef MRT6DEBUG 964 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 965 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 966 ip6_sprintf(&ip6->ip6_src), 967 ip6_sprintf(&ip6->ip6_dst)); 968 #endif 969 970 /* 971 * Allocate mbufs early so that we don't do extra work if we 972 * are just going to fail anyway. 973 */ 974 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 975 M_NOWAIT); 976 if (rte == NULL) { 977 splx(s); 978 return ENOBUFS; 979 } 980 mb0 = m_copy(m, 0, M_COPYALL); 981 /* 982 * Pullup packet header if needed before storing it, 983 * as other references may modify it in the meantime. 984 */ 985 if (mb0 && 986 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 987 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 988 if (mb0 == NULL) { 989 free(rte, M_MRTABLE); 990 splx(s); 991 return ENOBUFS; 992 } 993 994 /* is there an upcall waiting for this packet? */ 995 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 996 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 997 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 998 &rt->mf6c_origin.sin6_addr) && 999 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1000 &rt->mf6c_mcastgrp.sin6_addr) && 1001 (rt->mf6c_stall != NULL)) 1002 break; 1003 } 1004 1005 if (rt == NULL) { 1006 struct mrt6msg *im; 1007 1008 /* no upcall, so make a new entry */ 1009 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1010 M_NOWAIT); 1011 if (rt == NULL) { 1012 free(rte, M_MRTABLE); 1013 m_freem(mb0); 1014 splx(s); 1015 return ENOBUFS; 1016 } 1017 /* 1018 * Make a copy of the header to send to the user 1019 * level process 1020 */ 1021 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1022 1023 if (mm == NULL) { 1024 free(rte, M_MRTABLE); 1025 m_freem(mb0); 1026 free(rt, M_MRTABLE); 1027 splx(s); 1028 return ENOBUFS; 1029 } 1030 1031 /* 1032 * Send message to routing daemon 1033 */ 1034 sin6.sin6_addr = ip6->ip6_src; 1035 1036 im = mtod(mm, struct mrt6msg *); 1037 im->im6_msgtype = MRT6MSG_NOCACHE; 1038 im->im6_mbz = 0; 1039 1040 #ifdef MRT6DEBUG 1041 if (mrt6debug & DEBUG_FORWARD) 1042 log(LOG_DEBUG, 1043 "getting the iif info in the kernel\n"); 1044 #endif 1045 1046 for (mifp = mif6table, mifi = 0; 1047 mifi < nummifs && mifp->m6_ifp != ifp; 1048 mifp++, mifi++) 1049 ; 1050 1051 im->im6_mif = mifi; 1052 1053 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1054 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1055 "socket queue full\n"); 1056 mrt6stat.mrt6s_upq_sockfull++; 1057 free(rte, M_MRTABLE); 1058 m_freem(mb0); 1059 free(rt, M_MRTABLE); 1060 splx(s); 1061 return ENOBUFS; 1062 } 1063 1064 mrt6stat.mrt6s_upcalls++; 1065 1066 /* insert new entry at head of hash chain */ 1067 bzero(rt, sizeof(*rt)); 1068 rt->mf6c_origin.sin6_family = AF_INET6; 1069 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1070 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1071 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1072 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1073 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1074 rt->mf6c_expire = UPCALL_EXPIRE; 1075 nexpire[hash]++; 1076 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1077 1078 /* link into table */ 1079 rt->mf6c_next = mf6ctable[hash]; 1080 mf6ctable[hash] = rt; 1081 /* Add this entry to the end of the queue */ 1082 rt->mf6c_stall = rte; 1083 } else { 1084 /* determine if q has overflowed */ 1085 struct rtdetq **p; 1086 register int npkts = 0; 1087 1088 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1089 if (++npkts > MAX_UPQ6) { 1090 mrt6stat.mrt6s_upq_ovflw++; 1091 free(rte, M_MRTABLE); 1092 m_freem(mb0); 1093 splx(s); 1094 return 0; 1095 } 1096 1097 /* Add this entry to the end of the queue */ 1098 *p = rte; 1099 } 1100 1101 rte->next = NULL; 1102 rte->m = mb0; 1103 rte->ifp = ifp; 1104 #ifdef UPCALL_TIMING 1105 rte->t = tp; 1106 #endif /* UPCALL_TIMING */ 1107 1108 splx(s); 1109 1110 return 0; 1111 } 1112 } 1113 1114 /* 1115 * Clean up cache entries if upcalls are not serviced 1116 * Call from the Slow Timeout mechanism, every half second. 1117 */ 1118 static void 1119 expire_upcalls(unused) 1120 void *unused; 1121 { 1122 struct rtdetq *rte; 1123 struct mf6c *mfc, **nptr; 1124 int i; 1125 int s; 1126 1127 s = splsoftnet(); 1128 for (i = 0; i < MF6CTBLSIZ; i++) { 1129 if (nexpire[i] == 0) 1130 continue; 1131 nptr = &mf6ctable[i]; 1132 while ((mfc = *nptr) != NULL) { 1133 rte = mfc->mf6c_stall; 1134 /* 1135 * Skip real cache entries 1136 * Make sure it wasn't marked to not expire (shouldn't happen) 1137 * If it expires now 1138 */ 1139 if (rte != NULL && 1140 mfc->mf6c_expire != 0 && 1141 --mfc->mf6c_expire == 0) { 1142 #ifdef MRT6DEBUG 1143 if (mrt6debug & DEBUG_EXPIRE) 1144 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1145 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1146 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1147 #endif 1148 /* 1149 * drop all the packets 1150 * free the mbuf with the pkt, if, timing info 1151 */ 1152 do { 1153 struct rtdetq *n = rte->next; 1154 m_freem(rte->m); 1155 free(rte, M_MRTABLE); 1156 rte = n; 1157 } while (rte != NULL); 1158 mrt6stat.mrt6s_cache_cleanups++; 1159 nexpire[i]--; 1160 1161 *nptr = mfc->mf6c_next; 1162 free(mfc, M_MRTABLE); 1163 } else { 1164 nptr = &mfc->mf6c_next; 1165 } 1166 } 1167 } 1168 splx(s); 1169 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 1170 } 1171 1172 /* 1173 * Packet forwarding routine once entry in the cache is made 1174 */ 1175 static int 1176 ip6_mdq(m, ifp, rt) 1177 register struct mbuf *m; 1178 register struct ifnet *ifp; 1179 register struct mf6c *rt; 1180 { 1181 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1182 register mifi_t mifi, iif; 1183 register struct mif6 *mifp; 1184 register int plen = m->m_pkthdr.len; 1185 1186 /* 1187 * Macro to send packet on mif. Since RSVP packets don't get counted on 1188 * input, they shouldn't get counted on output, so statistics keeping is 1189 * seperate. 1190 */ 1191 1192 #define MC6_SEND(ip6,mifp,m) { \ 1193 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1194 register_send((ip6), (mifp), (m)); \ 1195 else \ 1196 phyint_send((ip6), (mifp), (m)); \ 1197 } 1198 1199 /* 1200 * Don't forward if it didn't arrive from the parent mif 1201 * for its origin. 1202 */ 1203 mifi = rt->mf6c_parent; 1204 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1205 /* came in the wrong interface */ 1206 #ifdef MRT6DEBUG 1207 if (mrt6debug & DEBUG_FORWARD) 1208 log(LOG_DEBUG, 1209 "wrong if: ifid %d mifi %d mififid %x\n", 1210 ifp->if_index, mifi, 1211 mif6table[mifi].m6_ifp->if_index); 1212 #endif 1213 mrt6stat.mrt6s_wrong_if++; 1214 rt->mf6c_wrong_if++; 1215 /* 1216 * If we are doing PIM processing, and we are forwarding 1217 * packets on this interface, send a message to the 1218 * routing daemon. 1219 */ 1220 if(mifi < nummifs) /* have to make sure this is a valid mif */ 1221 if(mif6table[mifi].m6_ifp) 1222 1223 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1224 /* 1225 * Check the M_LOOP flag to avoid an 1226 * unnecessary PIM assert. 1227 * XXX: M_LOOP is an ad-hoc hack... 1228 */ 1229 static struct sockaddr_in6 sin6 = 1230 { sizeof(sin6), AF_INET6 }; 1231 1232 register struct mbuf *mm; 1233 struct mrt6msg *im; 1234 1235 mm = m_copy(m, 0, 1236 sizeof(struct ip6_hdr)); 1237 if (mm && 1238 (M_HASCL(mm) || 1239 mm->m_len < sizeof(struct ip6_hdr))) 1240 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1241 if (mm == NULL) 1242 return ENOBUFS; 1243 1244 im = mtod(mm, struct mrt6msg *); 1245 im->im6_msgtype = MRT6MSG_WRONGMIF; 1246 im->im6_mbz = 0; 1247 1248 for (mifp = mif6table, iif = 0; 1249 iif < nummifs && mifp && 1250 mifp->m6_ifp != ifp; 1251 mifp++, iif++); 1252 1253 im->im6_mif = iif; 1254 1255 sin6.sin6_addr = im->im6_src; 1256 1257 mrt6stat.mrt6s_upcalls++; 1258 1259 if (socket_send(ip6_mrouter, mm, 1260 &sin6) < 0) { 1261 #ifdef MRT6DEBUG 1262 if (mrt6debug) 1263 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1264 #endif 1265 ++mrt6stat.mrt6s_upq_sockfull; 1266 return ENOBUFS; 1267 } /* if socket Q full */ 1268 } /* if PIM */ 1269 return 0; 1270 } /* if wrong iif */ 1271 1272 /* If I sourced this packet, it counts as output, else it was input. */ 1273 if (m->m_pkthdr.rcvif == NULL) { 1274 /* XXX: is rcvif really NULL when output?? */ 1275 mif6table[mifi].m6_pkt_out++; 1276 mif6table[mifi].m6_bytes_out += plen; 1277 } else { 1278 mif6table[mifi].m6_pkt_in++; 1279 mif6table[mifi].m6_bytes_in += plen; 1280 } 1281 rt->mf6c_pkt_cnt++; 1282 rt->mf6c_byte_cnt += plen; 1283 1284 /* 1285 * For each mif, forward a copy of the packet if there are group 1286 * members downstream on the interface. 1287 */ 1288 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1289 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1290 mifp->m6_pkt_out++; 1291 mifp->m6_bytes_out += plen; 1292 MC6_SEND(ip6, mifp, m); 1293 } 1294 return 0; 1295 } 1296 1297 static void 1298 phyint_send(ip6, mifp, m) 1299 struct ip6_hdr *ip6; 1300 struct mif6 *mifp; 1301 struct mbuf *m; 1302 { 1303 register struct mbuf *mb_copy; 1304 struct ifnet *ifp = mifp->m6_ifp; 1305 int error = 0; 1306 int s = splsoftnet(); 1307 static struct route_in6 ro6; 1308 struct in6_multi *in6m; 1309 1310 /* 1311 * Make a new reference to the packet; make sure that 1312 * the IPv6 header is actually copied, not just referenced, 1313 * so that ip6_output() only scribbles on the copy. 1314 */ 1315 mb_copy = m_copy(m, 0, M_COPYALL); 1316 if (mb_copy && 1317 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1318 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1319 if (mb_copy == NULL) 1320 return; 1321 /* set MCAST flag to the outgoing packet */ 1322 mb_copy->m_flags |= M_MCAST; 1323 1324 /* 1325 * If we sourced the packet, call ip6_output since we may devide 1326 * the packet into fragments when the packet is too big for the 1327 * outgoing interface. 1328 * Otherwise, we can simply send the packet to the interface 1329 * sending queue. 1330 */ 1331 if (m->m_pkthdr.rcvif == NULL) { 1332 struct ip6_moptions im6o; 1333 1334 im6o.im6o_multicast_ifp = ifp; 1335 /* XXX: ip6_output will override ip6->ip6_hlim */ 1336 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1337 im6o.im6o_multicast_loop = 1; 1338 error = ip6_output(mb_copy, NULL, &ro6, 1339 IPV6_FORWARDING, &im6o, NULL); 1340 1341 #ifdef MRT6DEBUG 1342 if (mrt6debug & DEBUG_XMIT) 1343 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1344 mifp - mif6table, error); 1345 #endif 1346 splx(s); 1347 return; 1348 } 1349 1350 /* 1351 * If we belong to the destination multicast group 1352 * on the outgoing interface, loop back a copy. 1353 */ 1354 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1355 if (in6m != NULL) { 1356 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1357 ro6.ro_dst.sin6_family = AF_INET6; 1358 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1359 ip6_mloopback(ifp, m, &ro6.ro_dst); 1360 } 1361 /* 1362 * Put the packet into the sending queue of the outgoing interface 1363 * if it would fit in the MTU of the interface. 1364 */ 1365 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1366 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1367 ro6.ro_dst.sin6_family = AF_INET6; 1368 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1369 /* 1370 * We just call if_output instead of nd6_output here, since 1371 * we need no ND for a multicast forwarded packet...right? 1372 */ 1373 error = (*ifp->if_output)(ifp, mb_copy, 1374 (struct sockaddr *)&ro6.ro_dst, 1375 NULL); 1376 #ifdef MRT6DEBUG 1377 if (mrt6debug & DEBUG_XMIT) 1378 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1379 mifp - mif6table, error); 1380 #endif 1381 } 1382 else { 1383 #ifdef MULTICAST_PMTUD 1384 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1385 return; 1386 #else 1387 #ifdef MRT6DEBUG 1388 if (mrt6debug & DEBUG_DEBUG_XMIT) 1389 log(LOG_DEBUG, 1390 "phyint_send: packet too big on %s o %s g %s" 1391 " size %d(discarded)\n", 1392 ifp->if_xname, 1393 ip6_sprintf(&ip6->ip6_src), 1394 ip6_sprintf(&ip6->ip6_dst), 1395 mb_copy->m_pkthdr.len); 1396 #endif /* MRT6DEBUG */ 1397 m_freem(mb_copy); /* simply discard the packet */ 1398 return; 1399 #endif 1400 } 1401 } 1402 1403 static int 1404 register_send(ip6, mif, m) 1405 register struct ip6_hdr *ip6; 1406 struct mif6 *mif; 1407 register struct mbuf *m; 1408 { 1409 register struct mbuf *mm; 1410 register int i, len = m->m_pkthdr.len; 1411 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1412 struct mrt6msg *im6; 1413 1414 #ifdef MRT6DEBUG 1415 if (mrt6debug) 1416 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1417 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1418 #endif 1419 ++pim6stat.pim6s_snd_registers; 1420 1421 /* Make a copy of the packet to send to the user level process */ 1422 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1423 if (mm == NULL) 1424 return ENOBUFS; 1425 mm->m_data += max_linkhdr; 1426 mm->m_len = sizeof(struct ip6_hdr); 1427 1428 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1429 m_freem(mm); 1430 return ENOBUFS; 1431 } 1432 i = MHLEN - M_LEADINGSPACE(mm); 1433 if (i > len) 1434 i = len; 1435 mm = m_pullup(mm, i); 1436 if (mm == NULL){ 1437 m_freem(mm); 1438 return ENOBUFS; 1439 } 1440 /* TODO: check it! */ 1441 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1442 1443 /* 1444 * Send message to routing daemon 1445 */ 1446 sin6.sin6_addr = ip6->ip6_src; 1447 1448 im6 = mtod(mm, struct mrt6msg *); 1449 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1450 im6->im6_mbz = 0; 1451 1452 im6->im6_mif = mif - mif6table; 1453 1454 /* iif info is not given for reg. encap.n */ 1455 mrt6stat.mrt6s_upcalls++; 1456 1457 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1458 #ifdef MRT6DEBUG 1459 if (mrt6debug) 1460 log(LOG_WARNING, 1461 "register_send: ip_mrouter socket queue full\n"); 1462 #endif 1463 ++mrt6stat.mrt6s_upq_sockfull; 1464 return ENOBUFS; 1465 } 1466 return 0; 1467 } 1468 1469 /* 1470 * PIM sparse mode hook 1471 * Receives the pim control messages, and passes them up to the listening 1472 * socket, using rip6_input. 1473 * The only message processed is the REGISTER pim message; the pim header 1474 * is stripped off, and the inner packet is passed to register_mforward. 1475 */ 1476 int 1477 pim6_input(mp, offp, proto) 1478 struct mbuf **mp; 1479 int *offp, proto; 1480 { 1481 register struct pim *pim; /* pointer to a pim struct */ 1482 register struct ip6_hdr *ip6; 1483 register int pimlen; 1484 struct mbuf *m = *mp; 1485 int minlen; 1486 int off = *offp; 1487 1488 ++pim6stat.pim6s_rcv_total; 1489 1490 ip6 = mtod(m, struct ip6_hdr *); 1491 pimlen = m->m_pkthdr.len - *offp; 1492 1493 /* 1494 * Validate lengths 1495 */ 1496 if (pimlen < PIM_MINLEN) { 1497 ++pim6stat.pim6s_rcv_tooshort; 1498 #ifdef MRT6DEBUG 1499 if (mrt6debug & DEBUG_PIM) 1500 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1501 #endif 1502 m_freem(m); 1503 return(IPPROTO_DONE); 1504 } 1505 1506 /* 1507 * if the packet is at least as big as a REGISTER, go ahead 1508 * and grab the PIM REGISTER header size, to avoid another 1509 * possible m_pullup() later. 1510 * 1511 * PIM_MINLEN == pimhdr + u_int32 == 8 1512 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1513 */ 1514 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1515 1516 /* 1517 * Make sure that the IP6 and PIM headers in contiguous memory, and 1518 * possibly the PIM REGISTER header 1519 */ 1520 #ifndef PULLDOWN_TEST 1521 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1522 /* adjust pointer */ 1523 ip6 = mtod(m, struct ip6_hdr *); 1524 1525 /* adjust mbuf to point to the PIM header */ 1526 pim = (struct pim *)((caddr_t)ip6 + off); 1527 #else 1528 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1529 if (pim == NULL) { 1530 pim6stat.pim6s_rcv_tooshort++; 1531 return IPPROTO_DONE; 1532 } 1533 #endif 1534 1535 #define PIM6_CHECKSUM 1536 #ifdef PIM6_CHECKSUM 1537 { 1538 int cksumlen; 1539 1540 /* 1541 * Validate checksum. 1542 * If PIM REGISTER, exclude the data packet 1543 */ 1544 if (pim->pim_type == PIM_REGISTER) 1545 cksumlen = PIM_MINLEN; 1546 else 1547 cksumlen = pimlen; 1548 1549 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1550 ++pim6stat.pim6s_rcv_badsum; 1551 #ifdef MRT6DEBUG 1552 if (mrt6debug & DEBUG_PIM) 1553 log(LOG_DEBUG, 1554 "pim6_input: invalid checksum\n"); 1555 #endif 1556 m_freem(m); 1557 return(IPPROTO_DONE); 1558 } 1559 } 1560 #endif /* PIM_CHECKSUM */ 1561 1562 /* PIM version check */ 1563 if (pim->pim_ver != PIM_VERSION) { 1564 ++pim6stat.pim6s_rcv_badversion; 1565 #ifdef MRT6DEBUG 1566 log(LOG_ERR, 1567 "pim6_input: incorrect version %d, expecting %d\n", 1568 pim->pim_ver, PIM_VERSION); 1569 #endif 1570 m_freem(m); 1571 return(IPPROTO_DONE); 1572 } 1573 1574 if (pim->pim_type == PIM_REGISTER) { 1575 /* 1576 * since this is a REGISTER, we'll make a copy of the register 1577 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1578 * routing daemon. 1579 */ 1580 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1581 1582 struct mbuf *mcp; 1583 struct ip6_hdr *eip6; 1584 u_int32_t *reghdr; 1585 int rc; 1586 1587 ++pim6stat.pim6s_rcv_registers; 1588 1589 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1590 #ifdef MRT6DEBUG 1591 if (mrt6debug & DEBUG_PIM) 1592 log(LOG_DEBUG, 1593 "pim6_input: register mif not set: %d\n", 1594 reg_mif_num); 1595 #endif 1596 m_freem(m); 1597 return(IPPROTO_DONE); 1598 } 1599 1600 reghdr = (u_int32_t *)(pim + 1); 1601 1602 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1603 goto pim6_input_to_daemon; 1604 1605 /* 1606 * Validate length 1607 */ 1608 if (pimlen < PIM6_REG_MINLEN) { 1609 ++pim6stat.pim6s_rcv_tooshort; 1610 ++pim6stat.pim6s_rcv_badregisters; 1611 #ifdef MRT6DEBUG 1612 log(LOG_ERR, 1613 "pim6_input: register packet size too " 1614 "small %d from %s\n", 1615 pimlen, ip6_sprintf(&ip6->ip6_src)); 1616 #endif 1617 m_freem(m); 1618 return(IPPROTO_DONE); 1619 } 1620 1621 eip6 = (struct ip6_hdr *) (reghdr + 1); 1622 #ifdef MRT6DEBUG 1623 if (mrt6debug & DEBUG_PIM) 1624 log(LOG_DEBUG, 1625 "pim6_input[register], eip6: %s -> %s, " 1626 "eip6 plen %d\n", 1627 ip6_sprintf(&eip6->ip6_src), 1628 ip6_sprintf(&eip6->ip6_dst), 1629 ntohs(eip6->ip6_plen)); 1630 #endif 1631 1632 /* verify the inner packet is destined to a mcast group */ 1633 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1634 ++pim6stat.pim6s_rcv_badregisters; 1635 #ifdef MRT6DEBUG 1636 if (mrt6debug & DEBUG_PIM) 1637 log(LOG_DEBUG, 1638 "pim6_input: inner packet of register " 1639 "is not multicast %s\n", 1640 ip6_sprintf(&eip6->ip6_dst)); 1641 #endif 1642 m_freem(m); 1643 return(IPPROTO_DONE); 1644 } 1645 1646 /* 1647 * make a copy of the whole header to pass to the daemon later. 1648 */ 1649 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1650 if (mcp == NULL) { 1651 #ifdef MRT6DEBUG 1652 log(LOG_ERR, 1653 "pim6_input: pim register: " 1654 "could not copy register head\n"); 1655 #endif 1656 m_freem(m); 1657 return(IPPROTO_DONE); 1658 } 1659 1660 /* 1661 * forward the inner ip6 packet; point m_data at the inner ip6. 1662 */ 1663 m_adj(m, off + PIM_MINLEN); 1664 #ifdef MRT6DEBUG 1665 if (mrt6debug & DEBUG_PIM) { 1666 log(LOG_DEBUG, 1667 "pim6_input: forwarding decapsulated register: " 1668 "src %s, dst %s, mif %d\n", 1669 ip6_sprintf(&eip6->ip6_src), 1670 ip6_sprintf(&eip6->ip6_dst), 1671 reg_mif_num); 1672 } 1673 #endif 1674 1675 rc = looutput(mif6table[reg_mif_num].m6_ifp, m, 1676 (struct sockaddr *) &dst, 1677 (struct rtentry *) NULL); 1678 1679 /* prepare the register head to send to the mrouting daemon */ 1680 m = mcp; 1681 } 1682 1683 /* 1684 * Pass the PIM message up to the daemon; if it is a register message 1685 * pass the 'head' only up to the daemon. This includes the 1686 * encapsulator ip6 header, pim header, register header and the 1687 * encapsulated ip6 header. 1688 */ 1689 pim6_input_to_daemon: 1690 rip6_input(&m, offp, proto); 1691 return(IPPROTO_DONE); 1692 } 1693
Indexes created Tue Sep 23 02:09:52 GMT 2025