1 /* $FreeBSD: src/sys/netinet6/ip6_mroute.c,v 1.2.2.9 2003/01/23 21:06:47 sam Exp $ */ 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 * Copyright (c) 1989 Stephen Deering 37 * Copyright (c) 1992, 1993 38 * The Regents of the University of California. All rights reserved. 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Stephen Deering of Stanford University. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 72 */ 73 74 /* 75 * IP multicast forwarding procedures 76 * 77 * Written by David Waitzman, BBN Labs, August 1988. 78 * Modified by Steve Deering, Stanford, February 1989. 79 * Modified by Mark J. Steiglitz, Stanford, May, 1991 80 * Modified by Van Jacobson, LBL, January 1993 81 * Modified by Ajit Thyagarajan, PARC, August 1993 82 * Modified by Bill Fenner, PARC, April 1994 83 * 84 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 85 */ 86 87 #include "opt_inet.h" 88 #include "opt_inet6.h" 89 90 #include <sys/param.h> 91 #include <sys/systm.h> 92 #include <sys/callout.h> 93 #include <sys/malloc.h> 94 #include <sys/mbuf.h> 95 #include <sys/socket.h> 96 #include <sys/socketvar.h> 97 #include <sys/sockio.h> 98 #include <sys/protosw.h> 99 #include <sys/errno.h> 100 #include <sys/time.h> 101 #include <sys/kernel.h> 102 #include <sys/syslog.h> 103 #include <sys/thread2.h> 104 105 #include <net/if.h> 106 #include <net/route.h> 107 #include <net/raw_cb.h> 108 109 #include <netinet/in.h> 110 #include <netinet/in_var.h> 111 112 #include <netinet/ip6.h> 113 #include <netinet6/ip6_var.h> 114 #include <netinet6/ip6_mroute.h> 115 #include <netinet6/nd6.h> 116 #include <netinet6/pim6.h> 117 #include <netinet6/pim6_var.h> 118 119 #include <net/net_osdep.h> 120 121 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry"); 122 123 #define M_HASCL(m) ((m)->m_flags & M_EXT) 124 125 static int ip6_mdq (struct mbuf *, struct ifnet *, struct mf6c *); 126 static void phyint_send (struct ip6_hdr *, struct mif6 *, struct mbuf *); 127 128 static int set_pim6 (int *); 129 static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in6 *); 130 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 131 132 /* 133 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 134 * except for netstat or debugging purposes. 135 */ 136 struct socket *ip6_mrouter = NULL; 137 int ip6_mrouter_ver = 0; 138 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 139 struct mrt6stat mrt6stat; 140 141 #define NO_RTE_FOUND 0x1 142 #define RTE_FOUND 0x2 143 144 struct mf6c *mf6ctable[MF6CTBLSIZ]; 145 u_char n6expire[MF6CTBLSIZ]; 146 static struct mif6 mif6table[MAXMIFS]; 147 #ifdef MRT6DEBUG 148 u_int mrt6debug = 0; /* debug level */ 149 #define DEBUG_MFC 0x02 150 #define DEBUG_FORWARD 0x04 151 #define DEBUG_EXPIRE 0x08 152 #define DEBUG_XMIT 0x10 153 #define DEBUG_REG 0x20 154 #define DEBUG_PIM 0x40 155 #endif 156 157 static void expire_upcalls (void *); 158 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 159 #define UPCALL_EXPIRE 6 /* number of timeouts */ 160 161 #ifdef INET 162 #ifdef MROUTING 163 extern struct socket *ip_mrouter; 164 #endif 165 #endif 166 167 /* 168 * 'Interfaces' associated with decapsulator (so we can tell 169 * packets that went through it from ones that get reflected 170 * by a broken gateway). These interfaces are never linked into 171 * the system ifnet list & no routes point to them. I.e., packets 172 * can't be sent this way. They only exist as a placeholder for 173 * multicast source verification. 174 */ 175 struct ifnet multicast_register_if; 176 177 #define ENCAP_HOPS 64 178 179 /* 180 * Private variables. 181 */ 182 static mifi_t nummifs = 0; 183 static mifi_t reg_mif_num = (mifi_t)-1; 184 185 static struct pim6stat pim6stat; 186 static int pim6; 187 188 /* 189 * Hash function for a source, group entry 190 */ 191 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 192 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 193 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 194 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 195 196 /* 197 * Find a route for a given origin IPv6 address and Multicast group address. 198 * Quality of service parameter to be added in the future!!! 199 */ 200 201 #define MF6CFIND(o, g, rt) do { \ 202 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 203 rt = NULL; \ 204 mrt6stat.mrt6s_mfc_lookups++; \ 205 while (_rt) { \ 206 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 207 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 208 (_rt->mf6c_stall == NULL)) { \ 209 rt = _rt; \ 210 break; \ 211 } \ 212 _rt = _rt->mf6c_next; \ 213 } \ 214 if (rt == NULL) { \ 215 mrt6stat.mrt6s_mfc_misses++; \ 216 } \ 217 } while (0) 218 219 /* 220 * Macros to compute elapsed time efficiently 221 * Borrowed from Van Jacobson's scheduling code 222 */ 223 #define TV_DELTA(a, b, delta) do { \ 224 int xxs; \ 225 \ 226 delta = (a).tv_usec - (b).tv_usec; \ 227 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 228 switch (xxs) { \ 229 case 2: \ 230 delta += 1000000; \ 231 /* FALLTHROUGH */ \ 232 case 1: \ 233 delta += 1000000; \ 234 break; \ 235 default: \ 236 delta += (1000000 * xxs); \ 237 } \ 238 } \ 239 } while (0) 240 241 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 242 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 243 244 #ifdef UPCALL_TIMING 245 #define UPCALL_MAX 50 246 u_long upcall_data[UPCALL_MAX + 1]; 247 static void collate(); 248 #endif /* UPCALL_TIMING */ 249 250 static int get_sg_cnt (struct sioc_sg_req6 *); 251 static int get_mif6_cnt (struct sioc_mif_req6 *); 252 static int ip6_mrouter_init (struct socket *, struct mbuf *, int); 253 static int add_m6if (struct mif6ctl *); 254 static int del_m6if (mifi_t *); 255 static int add_m6fc (struct mf6cctl *); 256 static int del_m6fc (struct mf6cctl *); 257 258 static struct callout expire_upcalls_ch; 259 260 /* 261 * Handle MRT setsockopt commands to modify the multicast routing tables. 262 */ 263 int 264 ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 265 { 266 int error = 0; 267 struct mbuf *m; 268 269 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 270 return (EACCES); 271 272 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 273 return (error); 274 soopt_to_mbuf(sopt, m); /* XXX */ 275 276 switch (sopt->sopt_name) { 277 case MRT6_INIT: 278 #ifdef MRT6_OINIT 279 case MRT6_OINIT: 280 #endif 281 error = ip6_mrouter_init(so, m, sopt->sopt_name); 282 break; 283 case MRT6_DONE: 284 error = ip6_mrouter_done(); 285 break; 286 case MRT6_ADD_MIF: 287 error = add_m6if(mtod(m, struct mif6ctl *)); 288 break; 289 case MRT6_DEL_MIF: 290 error = del_m6if(mtod(m, mifi_t *)); 291 break; 292 case MRT6_ADD_MFC: 293 error = add_m6fc(mtod(m, struct mf6cctl *)); 294 break; 295 case MRT6_DEL_MFC: 296 error = del_m6fc(mtod(m, struct mf6cctl *)); 297 break; 298 case MRT6_PIM: 299 error = set_pim6(mtod(m, int *)); 300 break; 301 default: 302 error = EOPNOTSUPP; 303 break; 304 } 305 306 m_freem(m); 307 return (error); 308 } 309 310 /* 311 * Handle MRT getsockopt commands 312 */ 313 int 314 ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 315 { 316 int error = 0; 317 318 if (so != ip6_mrouter) return EACCES; 319 320 switch (sopt->sopt_name) { 321 case MRT6_PIM: 322 soopt_from_kbuf(sopt, &pim6, sizeof(pim6)); 323 break; 324 } 325 return (error); 326 } 327 328 /* 329 * Handle ioctl commands to obtain information from the cache 330 */ 331 int 332 mrt6_ioctl(int cmd, caddr_t data) 333 { 334 int error = 0; 335 336 switch (cmd) { 337 case SIOCGETSGCNT_IN6: 338 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 339 break; /* for safety */ 340 case SIOCGETMIFCNT_IN6: 341 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 342 break; /* for safety */ 343 default: 344 return (EINVAL); 345 break; 346 } 347 return error; 348 } 349 350 /* 351 * returns the packet, byte, rpf-failure count for the source group provided 352 */ 353 static int 354 get_sg_cnt(struct sioc_sg_req6 *req) 355 { 356 struct mf6c *rt; 357 358 crit_enter(); 359 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 360 crit_exit(); 361 if (rt != NULL) { 362 req->pktcnt = rt->mf6c_pkt_cnt; 363 req->bytecnt = rt->mf6c_byte_cnt; 364 req->wrong_if = rt->mf6c_wrong_if; 365 } else 366 return (ESRCH); 367 #if 0 368 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 369 #endif 370 371 return 0; 372 } 373 374 /* 375 * returns the input and output packet and byte counts on the mif provided 376 */ 377 static int 378 get_mif6_cnt(struct sioc_mif_req6 *req) 379 { 380 mifi_t mifi = req->mifi; 381 382 if (mifi >= nummifs) 383 return EINVAL; 384 385 req->icount = mif6table[mifi].m6_pkt_in; 386 req->ocount = mif6table[mifi].m6_pkt_out; 387 req->ibytes = mif6table[mifi].m6_bytes_in; 388 req->obytes = mif6table[mifi].m6_bytes_out; 389 390 return 0; 391 } 392 393 static int 394 set_pim6(int *i) 395 { 396 if ((*i != 1) && (*i != 0)) 397 return EINVAL; 398 399 pim6 = *i; 400 401 return 0; 402 } 403 404 /* 405 * Enable multicast routing 406 */ 407 static int 408 ip6_mrouter_init(struct socket *so, struct mbuf *m, int cmd) 409 { 410 int *v; 411 412 #ifdef MRT6DEBUG 413 if (mrt6debug) 414 log(LOG_DEBUG, 415 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 416 so->so_type, so->so_proto->pr_protocol); 417 #endif 418 419 if (so->so_type != SOCK_RAW || 420 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 421 return EOPNOTSUPP; 422 423 if (!m || (m->m_len != sizeof(int *))) 424 return ENOPROTOOPT; 425 426 v = mtod(m, int *); 427 if (*v != 1) 428 return ENOPROTOOPT; 429 430 if (ip6_mrouter != NULL) 431 return EADDRINUSE; 432 433 ip6_mrouter = so; 434 ip6_mrouter_ver = cmd; 435 436 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 437 bzero((caddr_t)n6expire, sizeof(n6expire)); 438 439 pim6 = 0;/* used for stubbing out/in pim stuff */ 440 441 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 442 expire_upcalls, NULL); 443 444 #ifdef MRT6DEBUG 445 if (mrt6debug) 446 log(LOG_DEBUG, "ip6_mrouter_init\n"); 447 #endif 448 449 return 0; 450 } 451 452 /* 453 * Disable multicast routing 454 */ 455 int 456 ip6_mrouter_done(void) 457 { 458 mifi_t mifi; 459 int i; 460 struct ifnet *ifp; 461 struct in6_ifreq ifr; 462 struct mf6c *rt; 463 struct rtdetq *rte; 464 465 /* 466 * For each phyint in use, disable promiscuous reception of all IPv6 467 * multicasts. 468 */ 469 #ifdef INET 470 #ifdef MROUTING 471 /* 472 * If there is still IPv4 multicast routing daemon, 473 * we remain interfaces to receive all muliticasted packets. 474 * XXX: there may be an interface in which the IPv4 multicast 475 * daemon is not interested... 476 */ 477 if (!ip_mrouter) 478 #endif 479 #endif 480 { 481 for (mifi = 0; mifi < nummifs; mifi++) { 482 if (mif6table[mifi].m6_ifp && 483 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 484 ifr.ifr_addr.sin6_family = AF_INET6; 485 ifr.ifr_addr.sin6_addr = kin6addr_any; 486 ifp = mif6table[mifi].m6_ifp; 487 ifnet_serialize_all(ifp); 488 ifp->if_ioctl(ifp, SIOCDELMULTI, 489 (caddr_t)&ifr, NULL); 490 ifnet_deserialize_all(ifp); 491 } 492 } 493 } 494 #ifdef notyet 495 bzero((caddr_t)qtable, sizeof(qtable)); 496 bzero((caddr_t)tbftable, sizeof(tbftable)); 497 #endif 498 bzero((caddr_t)mif6table, sizeof(mif6table)); 499 nummifs = 0; 500 501 pim6 = 0; /* used to stub out/in pim specific code */ 502 503 callout_stop(&expire_upcalls_ch); 504 505 /* 506 * Free all multicast forwarding cache entries. 507 */ 508 for (i = 0; i < MF6CTBLSIZ; i++) { 509 rt = mf6ctable[i]; 510 while (rt) { 511 struct mf6c *frt; 512 513 for (rte = rt->mf6c_stall; rte != NULL; ) { 514 struct rtdetq *n = rte->next; 515 516 m_freem(rte->m); 517 kfree(rte, M_MRTABLE); 518 rte = n; 519 } 520 frt = rt; 521 rt = rt->mf6c_next; 522 kfree(frt, M_MRTABLE); 523 } 524 } 525 526 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 527 528 /* 529 * Reset de-encapsulation cache 530 */ 531 reg_mif_num = -1; 532 533 ip6_mrouter = NULL; 534 ip6_mrouter_ver = 0; 535 536 #ifdef MRT6DEBUG 537 if (mrt6debug) 538 log(LOG_DEBUG, "ip6_mrouter_done\n"); 539 #endif 540 541 return 0; 542 } 543 544 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 545 546 /* 547 * Add a mif to the mif table 548 */ 549 static int 550 add_m6if(struct mif6ctl *mifcp) 551 { 552 struct mif6 *mifp; 553 struct ifnet *ifp; 554 int error; 555 #ifdef notyet 556 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 557 #endif 558 559 if (mifcp->mif6c_mifi >= MAXMIFS) 560 return EINVAL; 561 mifp = mif6table + mifcp->mif6c_mifi; 562 if (mifp->m6_ifp) 563 return EADDRINUSE; /* XXX: is it appropriate? */ 564 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 565 return ENXIO; 566 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 567 568 if (mifcp->mif6c_flags & MIFF_REGISTER) { 569 if (reg_mif_num == (mifi_t)-1) { 570 strlcpy(multicast_register_if.if_xname, "register_mif", 571 IFNAMSIZ); 572 multicast_register_if.if_flags |= IFF_LOOPBACK; 573 multicast_register_if.if_index = mifcp->mif6c_mifi; 574 reg_mif_num = mifcp->mif6c_mifi; 575 } 576 577 ifp = &multicast_register_if; 578 579 } /* if REGISTER */ 580 else { 581 /* Make sure the interface supports multicast */ 582 if ((ifp->if_flags & IFF_MULTICAST) == 0) 583 return EOPNOTSUPP; 584 585 crit_enter(); 586 error = if_allmulti(ifp, 1); 587 crit_exit(); 588 if (error) 589 return error; 590 } 591 592 crit_enter(); 593 mifp->m6_flags = mifcp->mif6c_flags; 594 mifp->m6_ifp = ifp; 595 #ifdef notyet 596 /* scaling up here allows division by 1024 in critical code */ 597 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 598 #endif 599 /* initialize per mif pkt counters */ 600 mifp->m6_pkt_in = 0; 601 mifp->m6_pkt_out = 0; 602 mifp->m6_bytes_in = 0; 603 mifp->m6_bytes_out = 0; 604 crit_exit(); 605 606 /* Adjust nummifs up if the mifi is higher than nummifs */ 607 if (nummifs <= mifcp->mif6c_mifi) 608 nummifs = mifcp->mif6c_mifi + 1; 609 610 #ifdef MRT6DEBUG 611 if (mrt6debug) 612 log(LOG_DEBUG, 613 "add_mif #%d, phyint %s\n", 614 mifcp->mif6c_mifi, 615 ifp->if_xname); 616 #endif 617 618 return 0; 619 } 620 621 /* 622 * Delete a mif from the mif table 623 */ 624 static int 625 del_m6if(mifi_t *mifip) 626 { 627 struct mif6 *mifp = mif6table + *mifip; 628 mifi_t mifi; 629 struct ifnet *ifp; 630 631 if (*mifip >= nummifs) 632 return EINVAL; 633 if (mifp->m6_ifp == NULL) 634 return EINVAL; 635 636 crit_enter(); 637 638 if (!(mifp->m6_flags & MIFF_REGISTER)) { 639 /* 640 * XXX: what if there is yet IPv4 multicast daemon 641 * using the interface? 642 */ 643 ifp = mifp->m6_ifp; 644 645 if_allmulti(ifp, 0); 646 } 647 648 #ifdef notyet 649 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 650 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 651 #endif 652 bzero((caddr_t)mifp, sizeof (*mifp)); 653 654 /* Adjust nummifs down */ 655 for (mifi = nummifs; mifi > 0; mifi--) 656 if (mif6table[mifi - 1].m6_ifp) 657 break; 658 nummifs = mifi; 659 660 crit_exit(); 661 662 #ifdef MRT6DEBUG 663 if (mrt6debug) 664 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 665 #endif 666 667 return 0; 668 } 669 670 /* 671 * Add an mfc entry 672 */ 673 static int 674 add_m6fc(struct mf6cctl *mfccp) 675 { 676 struct mf6c *rt; 677 u_long hash; 678 struct rtdetq *rte; 679 u_short nstl; 680 681 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 682 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 683 684 /* If an entry already exists, just update the fields */ 685 if (rt) { 686 #ifdef MRT6DEBUG 687 if (mrt6debug & DEBUG_MFC) 688 log(LOG_DEBUG, 689 "add_m6fc no upcall h %d o %s g %s p %x\n", 690 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 691 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 692 mfccp->mf6cc_parent); 693 #endif 694 695 crit_enter(); 696 rt->mf6c_parent = mfccp->mf6cc_parent; 697 rt->mf6c_ifset = mfccp->mf6cc_ifset; 698 crit_exit(); 699 return 0; 700 } 701 702 /* 703 * Find the entry for which the upcall was made and update 704 */ 705 crit_enter(); 706 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 707 mfccp->mf6cc_mcastgrp.sin6_addr); 708 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 709 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 710 &mfccp->mf6cc_origin.sin6_addr) && 711 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 712 &mfccp->mf6cc_mcastgrp.sin6_addr) && 713 (rt->mf6c_stall != NULL)) { 714 715 if (nstl++) 716 log(LOG_ERR, 717 "add_m6fc: %s o %s g %s p %x dbx %p\n", 718 "multiple kernel entries", 719 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 720 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 721 mfccp->mf6cc_parent, rt->mf6c_stall); 722 723 #ifdef MRT6DEBUG 724 if (mrt6debug & DEBUG_MFC) 725 log(LOG_DEBUG, 726 "add_m6fc o %s g %s p %x dbg %x\n", 727 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 728 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 729 mfccp->mf6cc_parent, rt->mf6c_stall); 730 #endif 731 732 rt->mf6c_origin = mfccp->mf6cc_origin; 733 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 734 rt->mf6c_parent = mfccp->mf6cc_parent; 735 rt->mf6c_ifset = mfccp->mf6cc_ifset; 736 /* initialize pkt counters per src-grp */ 737 rt->mf6c_pkt_cnt = 0; 738 rt->mf6c_byte_cnt = 0; 739 rt->mf6c_wrong_if = 0; 740 741 rt->mf6c_expire = 0; /* Don't clean this guy up */ 742 n6expire[hash]--; 743 744 /* free packets Qed at the end of this entry */ 745 for (rte = rt->mf6c_stall; rte != NULL; ) { 746 struct rtdetq *n = rte->next; 747 ip6_mdq(rte->m, rte->ifp, rt); 748 m_freem(rte->m); 749 #ifdef UPCALL_TIMING 750 collate(&(rte->t)); 751 #endif /* UPCALL_TIMING */ 752 kfree(rte, M_MRTABLE); 753 rte = n; 754 } 755 rt->mf6c_stall = NULL; 756 } 757 } 758 759 /* 760 * It is possible that an entry is being inserted without an upcall 761 */ 762 if (nstl == 0) { 763 #ifdef MRT6DEBUG 764 if (mrt6debug & DEBUG_MFC) 765 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 766 hash, 767 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 768 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 769 mfccp->mf6cc_parent); 770 #endif 771 772 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 773 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 774 &mfccp->mf6cc_origin.sin6_addr)&& 775 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 776 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 777 778 rt->mf6c_origin = mfccp->mf6cc_origin; 779 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 780 rt->mf6c_parent = mfccp->mf6cc_parent; 781 rt->mf6c_ifset = mfccp->mf6cc_ifset; 782 /* initialize pkt counters per src-grp */ 783 rt->mf6c_pkt_cnt = 0; 784 rt->mf6c_byte_cnt = 0; 785 rt->mf6c_wrong_if = 0; 786 787 if (rt->mf6c_expire) 788 n6expire[hash]--; 789 rt->mf6c_expire = 0; 790 } 791 } 792 if (rt == NULL) { 793 /* no upcall, so make a new entry */ 794 rt = (struct mf6c *)kmalloc(sizeof(*rt), M_MRTABLE, 795 M_NOWAIT); 796 if (rt == NULL) { 797 crit_exit(); 798 return ENOBUFS; 799 } 800 801 /* insert new entry at head of hash chain */ 802 rt->mf6c_origin = mfccp->mf6cc_origin; 803 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 804 rt->mf6c_parent = mfccp->mf6cc_parent; 805 rt->mf6c_ifset = mfccp->mf6cc_ifset; 806 /* initialize pkt counters per src-grp */ 807 rt->mf6c_pkt_cnt = 0; 808 rt->mf6c_byte_cnt = 0; 809 rt->mf6c_wrong_if = 0; 810 rt->mf6c_expire = 0; 811 rt->mf6c_stall = NULL; 812 813 /* link into table */ 814 rt->mf6c_next = mf6ctable[hash]; 815 mf6ctable[hash] = rt; 816 } 817 } 818 crit_exit(); 819 return 0; 820 } 821 822 #ifdef UPCALL_TIMING 823 /* 824 * collect delay statistics on the upcalls 825 */ 826 static void 827 collate(struct timeval *t) 828 { 829 u_long d; 830 struct timeval tp; 831 u_long delta; 832 833 GET_TIME(tp); 834 835 if (TV_LT(*t, tp)) 836 { 837 TV_DELTA(tp, *t, delta); 838 839 d = delta >> 10; 840 if (d > UPCALL_MAX) 841 d = UPCALL_MAX; 842 843 ++upcall_data[d]; 844 } 845 } 846 #endif /* UPCALL_TIMING */ 847 848 /* 849 * Delete an mfc entry 850 */ 851 static int 852 del_m6fc(struct mf6cctl *mfccp) 853 { 854 struct sockaddr_in6 origin; 855 struct sockaddr_in6 mcastgrp; 856 struct mf6c *rt; 857 struct mf6c **nptr; 858 u_long hash; 859 860 origin = mfccp->mf6cc_origin; 861 mcastgrp = mfccp->mf6cc_mcastgrp; 862 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 863 864 #ifdef MRT6DEBUG 865 if (mrt6debug & DEBUG_MFC) 866 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 867 ip6_sprintf(&origin.sin6_addr), 868 ip6_sprintf(&mcastgrp.sin6_addr)); 869 #endif 870 871 crit_enter(); 872 873 nptr = &mf6ctable[hash]; 874 while ((rt = *nptr) != NULL) { 875 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 876 &rt->mf6c_origin.sin6_addr) && 877 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 878 &rt->mf6c_mcastgrp.sin6_addr) && 879 rt->mf6c_stall == NULL) 880 break; 881 882 nptr = &rt->mf6c_next; 883 } 884 if (rt == NULL) { 885 crit_exit(); 886 return EADDRNOTAVAIL; 887 } 888 889 *nptr = rt->mf6c_next; 890 kfree(rt, M_MRTABLE); 891 892 crit_exit(); 893 894 return 0; 895 } 896 897 static int 898 socket_send(struct socket *so, struct mbuf *mm, struct sockaddr_in6 *src) 899 { 900 if (so) { 901 lwkt_gettoken(&so->so_rcv.ssb_token); 902 if (ssb_appendaddr(&so->so_rcv, 903 (struct sockaddr *)src, 904 mm, NULL) != 0) { 905 sorwakeup(so); 906 lwkt_reltoken(&so->so_rcv.ssb_token); 907 return 0; 908 } 909 lwkt_reltoken(&so->so_rcv.ssb_token); 910 } 911 m_freem(mm); 912 return -1; 913 } 914 915 /* 916 * IPv6 multicast forwarding function. This function assumes that the packet 917 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 918 * pointed to by "ifp", and the packet is to be relayed to other networks 919 * that have members of the packet's destination IPv6 multicast group. 920 * 921 * The packet is returned unscathed to the caller, unless it is 922 * erroneous, in which case a non-zero return value tells the caller to 923 * discard it. 924 */ 925 926 int 927 ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 928 { 929 struct mf6c *rt; 930 struct mif6 *mifp; 931 struct mbuf *mm; 932 mifi_t mifi; 933 934 #ifdef MRT6DEBUG 935 if (mrt6debug & DEBUG_FORWARD) 936 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 937 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 938 ifp->if_index); 939 #endif 940 941 /* 942 * Don't forward a packet with Hop limit of zero or one, 943 * or a packet destined to a local-only group. 944 */ 945 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 946 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 947 return 0; 948 ip6->ip6_hlim--; 949 950 /* 951 * Source address check: do not forward packets with unspecified 952 * source. It was discussed in July 2000, on ipngwg mailing list. 953 * This is rather more serious than unicast cases, because some 954 * MLD packets can be sent with the unspecified source address 955 * (although such packets must normally set 1 to the hop limit field). 956 */ 957 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 958 ip6stat.ip6s_cantforward++; 959 if (ip6_log_time + ip6_log_interval < time_uptime) { 960 ip6_log_time = time_uptime; 961 log(LOG_DEBUG, 962 "cannot forward " 963 "from %s to %s nxt %d received on %s\n", 964 ip6_sprintf(&ip6->ip6_src), 965 ip6_sprintf(&ip6->ip6_dst), 966 ip6->ip6_nxt, 967 if_name(m->m_pkthdr.rcvif)); 968 } 969 return 0; 970 } 971 972 /* 973 * Determine forwarding mifs from the forwarding cache table 974 */ 975 crit_enter(); 976 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 977 978 /* Entry exists, so forward if necessary */ 979 if (rt) { 980 crit_exit(); 981 return (ip6_mdq(m, ifp, rt)); 982 } else { 983 /* 984 * If we don't have a route for packet's origin, 985 * Make a copy of the packet & 986 * send message to routing daemon 987 */ 988 989 struct mbuf *mb0; 990 struct rtdetq *rte; 991 u_long hash; 992 /* int i, npkts;*/ 993 #ifdef UPCALL_TIMING 994 struct timeval tp; 995 996 GET_TIME(tp); 997 #endif /* UPCALL_TIMING */ 998 999 mrt6stat.mrt6s_no_route++; 1000 #ifdef MRT6DEBUG 1001 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1002 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1003 ip6_sprintf(&ip6->ip6_src), 1004 ip6_sprintf(&ip6->ip6_dst)); 1005 #endif 1006 1007 /* 1008 * Allocate mbufs early so that we don't do extra work if we 1009 * are just going to fail anyway. 1010 */ 1011 rte = (struct rtdetq *)kmalloc(sizeof(*rte), M_MRTABLE, 1012 M_NOWAIT); 1013 if (rte == NULL) { 1014 crit_exit(); 1015 return ENOBUFS; 1016 } 1017 mb0 = m_copy(m, 0, M_COPYALL); 1018 /* 1019 * Pullup packet header if needed before storing it, 1020 * as other references may modify it in the meantime. 1021 */ 1022 if (mb0 && 1023 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1024 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1025 if (mb0 == NULL) { 1026 kfree(rte, M_MRTABLE); 1027 crit_exit(); 1028 return ENOBUFS; 1029 } 1030 1031 /* is there an upcall waiting for this packet? */ 1032 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1033 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1034 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1035 &rt->mf6c_origin.sin6_addr) && 1036 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1037 &rt->mf6c_mcastgrp.sin6_addr) && 1038 (rt->mf6c_stall != NULL)) 1039 break; 1040 } 1041 1042 if (rt == NULL) { 1043 struct mrt6msg *im; 1044 #ifdef MRT6_OINIT 1045 struct omrt6msg *oim; 1046 #endif 1047 1048 /* no upcall, so make a new entry */ 1049 rt = (struct mf6c *)kmalloc(sizeof(*rt), M_MRTABLE, 1050 M_NOWAIT); 1051 if (rt == NULL) { 1052 kfree(rte, M_MRTABLE); 1053 m_freem(mb0); 1054 crit_exit(); 1055 return ENOBUFS; 1056 } 1057 /* 1058 * Make a copy of the header to send to the user 1059 * level process 1060 */ 1061 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1062 1063 if (mm == NULL) { 1064 kfree(rte, M_MRTABLE); 1065 m_freem(mb0); 1066 kfree(rt, M_MRTABLE); 1067 crit_exit(); 1068 return ENOBUFS; 1069 } 1070 1071 /* 1072 * Send message to routing daemon 1073 */ 1074 sin6.sin6_addr = ip6->ip6_src; 1075 1076 im = NULL; 1077 #ifdef MRT6_OINIT 1078 oim = NULL; 1079 #endif 1080 switch (ip6_mrouter_ver) { 1081 #ifdef MRT6_OINIT 1082 case MRT6_OINIT: 1083 oim = mtod(mm, struct omrt6msg *); 1084 oim->im6_msgtype = MRT6MSG_NOCACHE; 1085 oim->im6_mbz = 0; 1086 break; 1087 #endif 1088 case MRT6_INIT: 1089 im = mtod(mm, struct mrt6msg *); 1090 im->im6_msgtype = MRT6MSG_NOCACHE; 1091 im->im6_mbz = 0; 1092 break; 1093 default: 1094 kfree(rte, M_MRTABLE); 1095 m_freem(mb0); 1096 kfree(rt, M_MRTABLE); 1097 crit_exit(); 1098 return EINVAL; 1099 } 1100 1101 #ifdef MRT6DEBUG 1102 if (mrt6debug & DEBUG_FORWARD) 1103 log(LOG_DEBUG, 1104 "getting the iif info in the kernel\n"); 1105 #endif 1106 1107 for (mifp = mif6table, mifi = 0; 1108 mifi < nummifs && mifp->m6_ifp != ifp; 1109 mifp++, mifi++) 1110 ; 1111 1112 switch (ip6_mrouter_ver) { 1113 #ifdef MRT6_OINIT 1114 case MRT6_OINIT: 1115 oim->im6_mif = mifi; 1116 break; 1117 #endif 1118 case MRT6_INIT: 1119 im->im6_mif = mifi; 1120 break; 1121 } 1122 1123 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1124 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1125 "socket queue full\n"); 1126 mrt6stat.mrt6s_upq_sockfull++; 1127 kfree(rte, M_MRTABLE); 1128 m_freem(mb0); 1129 kfree(rt, M_MRTABLE); 1130 crit_exit(); 1131 return ENOBUFS; 1132 } 1133 1134 mrt6stat.mrt6s_upcalls++; 1135 1136 /* insert new entry at head of hash chain */ 1137 bzero(rt, sizeof(*rt)); 1138 rt->mf6c_origin.sin6_family = AF_INET6; 1139 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1140 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1141 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1142 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1143 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1144 rt->mf6c_expire = UPCALL_EXPIRE; 1145 n6expire[hash]++; 1146 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1147 1148 /* link into table */ 1149 rt->mf6c_next = mf6ctable[hash]; 1150 mf6ctable[hash] = rt; 1151 /* Add this entry to the end of the queue */ 1152 rt->mf6c_stall = rte; 1153 } else { 1154 /* determine if q has overflowed */ 1155 struct rtdetq **p; 1156 int npkts = 0; 1157 1158 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1159 if (++npkts > MAX_UPQ6) { 1160 mrt6stat.mrt6s_upq_ovflw++; 1161 kfree(rte, M_MRTABLE); 1162 m_freem(mb0); 1163 crit_exit(); 1164 return 0; 1165 } 1166 1167 /* Add this entry to the end of the queue */ 1168 *p = rte; 1169 } 1170 1171 rte->next = NULL; 1172 rte->m = mb0; 1173 rte->ifp = ifp; 1174 #ifdef UPCALL_TIMING 1175 rte->t = tp; 1176 #endif /* UPCALL_TIMING */ 1177 1178 crit_exit(); 1179 1180 return 0; 1181 } 1182 } 1183 1184 /* 1185 * Clean up cache entries if upcalls are not serviced 1186 * Call from the Slow Timeout mechanism, every half second. 1187 */ 1188 static void 1189 expire_upcalls(void *unused) 1190 { 1191 struct rtdetq *rte; 1192 struct mf6c *mfc, **nptr; 1193 int i; 1194 1195 crit_enter(); 1196 for (i = 0; i < MF6CTBLSIZ; i++) { 1197 if (n6expire[i] == 0) 1198 continue; 1199 nptr = &mf6ctable[i]; 1200 while ((mfc = *nptr) != NULL) { 1201 rte = mfc->mf6c_stall; 1202 /* 1203 * Skip real cache entries 1204 * Make sure it wasn't marked to not expire (shouldn't happen) 1205 * If it expires now 1206 */ 1207 if (rte != NULL && 1208 mfc->mf6c_expire != 0 && 1209 --mfc->mf6c_expire == 0) { 1210 #ifdef MRT6DEBUG 1211 if (mrt6debug & DEBUG_EXPIRE) 1212 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1213 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1214 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1215 #endif 1216 /* 1217 * drop all the packets 1218 * free the mbuf with the pkt, if, timing info 1219 */ 1220 do { 1221 struct rtdetq *n = rte->next; 1222 m_freem(rte->m); 1223 kfree(rte, M_MRTABLE); 1224 rte = n; 1225 } while (rte != NULL); 1226 mrt6stat.mrt6s_cache_cleanups++; 1227 n6expire[i]--; 1228 1229 *nptr = mfc->mf6c_next; 1230 kfree(mfc, M_MRTABLE); 1231 } else { 1232 nptr = &mfc->mf6c_next; 1233 } 1234 } 1235 } 1236 crit_exit(); 1237 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1238 expire_upcalls, NULL); 1239 } 1240 1241 /* 1242 * Packet forwarding routine once entry in the cache is made 1243 */ 1244 static int 1245 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1246 { 1247 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1248 mifi_t mifi, iif; 1249 struct mif6 *mifp; 1250 int plen = m->m_pkthdr.len; 1251 1252 /* 1253 * Macro to send packet on mif. Since RSVP packets don't get counted on 1254 * input, they shouldn't get counted on output, so statistics keeping is 1255 * separate. 1256 */ 1257 1258 #define MC6_SEND(ip6, mifp, m) do { \ 1259 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1260 register_send((ip6), (mifp), (m)); \ 1261 else \ 1262 phyint_send((ip6), (mifp), (m)); \ 1263 } while (0) 1264 1265 /* 1266 * Don't forward if it didn't arrive from the parent mif 1267 * for its origin. 1268 */ 1269 mifi = rt->mf6c_parent; 1270 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1271 /* came in the wrong interface */ 1272 #ifdef MRT6DEBUG 1273 if (mrt6debug & DEBUG_FORWARD) 1274 log(LOG_DEBUG, 1275 "wrong if: ifid %d mifi %d mififid %x\n", 1276 ifp->if_index, mifi, 1277 mif6table[mifi].m6_ifp->if_index); 1278 #endif 1279 mrt6stat.mrt6s_wrong_if++; 1280 rt->mf6c_wrong_if++; 1281 /* 1282 * If we are doing PIM processing, and we are forwarding 1283 * packets on this interface, send a message to the 1284 * routing daemon. 1285 */ 1286 /* have to make sure this is a valid mif */ 1287 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1288 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1289 /* 1290 * Check the M_LOOP flag to avoid an 1291 * unnecessary PIM assert. 1292 * XXX: M_LOOP is an ad-hoc hack... 1293 */ 1294 static struct sockaddr_in6 sin6 = 1295 { sizeof(sin6), AF_INET6 }; 1296 1297 struct mbuf *mm; 1298 struct mrt6msg *im; 1299 #ifdef MRT6_OINIT 1300 struct omrt6msg *oim; 1301 #endif 1302 1303 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1304 if (mm && 1305 (M_HASCL(mm) || 1306 mm->m_len < sizeof(struct ip6_hdr))) 1307 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1308 if (mm == NULL) 1309 return ENOBUFS; 1310 1311 #ifdef MRT6_OINIT 1312 oim = NULL; 1313 #endif 1314 im = NULL; 1315 switch (ip6_mrouter_ver) { 1316 #ifdef MRT6_OINIT 1317 case MRT6_OINIT: 1318 oim = mtod(mm, struct omrt6msg *); 1319 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1320 oim->im6_mbz = 0; 1321 break; 1322 #endif 1323 case MRT6_INIT: 1324 im = mtod(mm, struct mrt6msg *); 1325 im->im6_msgtype = MRT6MSG_WRONGMIF; 1326 im->im6_mbz = 0; 1327 break; 1328 default: 1329 m_freem(mm); 1330 return EINVAL; 1331 } 1332 1333 for (mifp = mif6table, iif = 0; 1334 iif < nummifs && mifp && 1335 mifp->m6_ifp != ifp; 1336 mifp++, iif++) 1337 ; 1338 1339 switch (ip6_mrouter_ver) { 1340 #ifdef MRT6_OINIT 1341 case MRT6_OINIT: 1342 oim->im6_mif = iif; 1343 sin6.sin6_addr = oim->im6_src; 1344 break; 1345 #endif 1346 case MRT6_INIT: 1347 im->im6_mif = iif; 1348 sin6.sin6_addr = im->im6_src; 1349 break; 1350 } 1351 1352 mrt6stat.mrt6s_upcalls++; 1353 1354 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1355 #ifdef MRT6DEBUG 1356 if (mrt6debug) 1357 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1358 #endif 1359 ++mrt6stat.mrt6s_upq_sockfull; 1360 return ENOBUFS; 1361 } /* if socket Q full */ 1362 } /* if PIM */ 1363 return 0; 1364 } /* if wrong iif */ 1365 1366 /* If I sourced this packet, it counts as output, else it was input. */ 1367 if (m->m_pkthdr.rcvif == NULL) { 1368 /* XXX: is rcvif really NULL when output?? */ 1369 mif6table[mifi].m6_pkt_out++; 1370 mif6table[mifi].m6_bytes_out += plen; 1371 } else { 1372 mif6table[mifi].m6_pkt_in++; 1373 mif6table[mifi].m6_bytes_in += plen; 1374 } 1375 rt->mf6c_pkt_cnt++; 1376 rt->mf6c_byte_cnt += plen; 1377 1378 /* 1379 * For each mif, forward a copy of the packet if there are group 1380 * members downstream on the interface. 1381 */ 1382 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1383 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1384 /* 1385 * check if the outgoing packet is going to break 1386 * a scope boundary. 1387 * XXX For packets through PIM register tunnel 1388 * interface, we believe a routing daemon. 1389 */ 1390 if ((mif6table[rt->mf6c_parent].m6_flags & 1391 MIFF_REGISTER) == 0 && 1392 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1393 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1394 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1395 &ip6->ip6_dst) || 1396 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1397 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1398 &ip6->ip6_src))) { 1399 ip6stat.ip6s_badscope++; 1400 continue; 1401 } 1402 1403 mifp->m6_pkt_out++; 1404 mifp->m6_bytes_out += plen; 1405 MC6_SEND(ip6, mifp, m); 1406 } 1407 } 1408 return 0; 1409 } 1410 1411 static void 1412 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1413 { 1414 struct mbuf *mb_copy; 1415 struct ifnet *ifp = mifp->m6_ifp; 1416 int error = 0; 1417 static struct route_in6 ro; 1418 struct in6_multi *in6m; 1419 struct sockaddr_in6 *dst6; 1420 u_long linkmtu; 1421 1422 crit_enter(); /* needs to protect static "ro" below. */ 1423 1424 /* 1425 * Make a new reference to the packet; make sure that 1426 * the IPv6 header is actually copied, not just referenced, 1427 * so that ip6_output() only scribbles on the copy. 1428 */ 1429 mb_copy = m_copy(m, 0, M_COPYALL); 1430 if (mb_copy && 1431 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1432 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1433 if (mb_copy == NULL) { 1434 crit_exit(); 1435 return; 1436 } 1437 /* set MCAST flag to the outgoing packet */ 1438 mb_copy->m_flags |= M_MCAST; 1439 1440 /* 1441 * If we sourced the packet, call ip6_output since we may devide 1442 * the packet into fragments when the packet is too big for the 1443 * outgoing interface. 1444 * Otherwise, we can simply send the packet to the interface 1445 * sending queue. 1446 */ 1447 if (m->m_pkthdr.rcvif == NULL) { 1448 struct ip6_moptions im6o; 1449 1450 im6o.im6o_multicast_ifp = ifp; 1451 /* XXX: ip6_output will override ip6->ip6_hlim */ 1452 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1453 im6o.im6o_multicast_loop = 1; 1454 error = ip6_output(mb_copy, NULL, &ro, 1455 IPV6_FORWARDING, &im6o, NULL, NULL); 1456 1457 #ifdef MRT6DEBUG 1458 if (mrt6debug & DEBUG_XMIT) 1459 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1460 mifp - mif6table, error); 1461 #endif 1462 crit_exit(); 1463 return; 1464 } 1465 1466 /* 1467 * If we belong to the destination multicast group 1468 * on the outgoing interface, loop back a copy. 1469 */ 1470 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1471 in6m = IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp); 1472 if (in6m != NULL) { 1473 dst6->sin6_len = sizeof(struct sockaddr_in6); 1474 dst6->sin6_family = AF_INET6; 1475 dst6->sin6_addr = ip6->ip6_dst; 1476 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1477 } 1478 /* 1479 * Put the packet into the sending queue of the outgoing interface 1480 * if it would fit in the MTU of the interface. 1481 */ 1482 linkmtu = IN6_LINKMTU(ifp); 1483 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1484 dst6->sin6_len = sizeof(struct sockaddr_in6); 1485 dst6->sin6_family = AF_INET6; 1486 dst6->sin6_addr = ip6->ip6_dst; 1487 /* 1488 * We just call if_output instead of nd6_output here, since 1489 * we need no ND for a multicast forwarded packet...right? 1490 */ 1491 error = ifp->if_output(ifp, mb_copy, 1492 (struct sockaddr *)&ro.ro_dst, NULL); 1493 #ifdef MRT6DEBUG 1494 if (mrt6debug & DEBUG_XMIT) 1495 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1496 mifp - mif6table, error); 1497 #endif 1498 } else { 1499 #ifdef MULTICAST_PMTUD 1500 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1501 #else 1502 #ifdef MRT6DEBUG 1503 if (mrt6debug & DEBUG_XMIT) 1504 log(LOG_DEBUG, 1505 "phyint_send: packet too big on %s o %s g %s" 1506 " size %d(discarded)\n", 1507 if_name(ifp), 1508 ip6_sprintf(&ip6->ip6_src), 1509 ip6_sprintf(&ip6->ip6_dst), 1510 mb_copy->m_pkthdr.len); 1511 #endif /* MRT6DEBUG */ 1512 m_freem(mb_copy); /* simply discard the packet */ 1513 #endif 1514 } 1515 1516 crit_exit(); 1517 } 1518 1519 static int 1520 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1521 { 1522 struct mbuf *mm; 1523 int i, len = m->m_pkthdr.len; 1524 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1525 struct mrt6msg *im6; 1526 1527 #ifdef MRT6DEBUG 1528 if (mrt6debug) 1529 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1530 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1531 #endif 1532 ++pim6stat.pim6s_snd_registers; 1533 1534 /* Make a copy of the packet to send to the user level process */ 1535 MGETHDR(mm, M_NOWAIT, MT_HEADER); 1536 if (mm == NULL) 1537 return ENOBUFS; 1538 mm->m_pkthdr.rcvif = NULL; 1539 mm->m_data += max_linkhdr; 1540 mm->m_len = sizeof(struct ip6_hdr); 1541 1542 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1543 m_freem(mm); 1544 return ENOBUFS; 1545 } 1546 i = MHLEN - M_LEADINGSPACE(mm); 1547 if (i > len) 1548 i = len; 1549 mm = m_pullup(mm, i); 1550 if (mm == NULL) 1551 return ENOBUFS; 1552 /* TODO: check it! */ 1553 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1554 1555 /* 1556 * Send message to routing daemon 1557 */ 1558 sin6.sin6_addr = ip6->ip6_src; 1559 1560 im6 = mtod(mm, struct mrt6msg *); 1561 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1562 im6->im6_mbz = 0; 1563 1564 im6->im6_mif = mif - mif6table; 1565 1566 /* iif info is not given for reg. encap.n */ 1567 mrt6stat.mrt6s_upcalls++; 1568 1569 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1570 #ifdef MRT6DEBUG 1571 if (mrt6debug) 1572 log(LOG_WARNING, 1573 "register_send: ip6_mrouter socket queue full\n"); 1574 #endif 1575 ++mrt6stat.mrt6s_upq_sockfull; 1576 return ENOBUFS; 1577 } 1578 return 0; 1579 } 1580 1581 /* 1582 * PIM sparse mode hook 1583 * Receives the pim control messages, and passes them up to the listening 1584 * socket, using rip6_input. 1585 * The only message processed is the REGISTER pim message; the pim header 1586 * is stripped off, and the inner packet is passed to register_mforward. 1587 */ 1588 int 1589 pim6_input(struct mbuf **mp, int *offp, int proto) 1590 { 1591 struct pim *pim; /* pointer to a pim struct */ 1592 struct ip6_hdr *ip6; 1593 int pimlen; 1594 struct mbuf *m = *mp; 1595 int minlen; 1596 int off = *offp; 1597 1598 ++pim6stat.pim6s_rcv_total; 1599 1600 ip6 = mtod(m, struct ip6_hdr *); 1601 pimlen = m->m_pkthdr.len - *offp; 1602 1603 /* 1604 * Validate lengths 1605 */ 1606 if (pimlen < PIM_MINLEN) { 1607 ++pim6stat.pim6s_rcv_tooshort; 1608 #ifdef MRT6DEBUG 1609 if (mrt6debug & DEBUG_PIM) 1610 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1611 #endif 1612 m_freem(m); 1613 return (IPPROTO_DONE); 1614 } 1615 1616 /* 1617 * if the packet is at least as big as a REGISTER, go ahead 1618 * and grab the PIM REGISTER header size, to avoid another 1619 * possible m_pullup() later. 1620 * 1621 * PIM_MINLEN == pimhdr + u_int32 == 8 1622 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1623 */ 1624 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1625 1626 /* 1627 * Make sure that the IP6 and PIM headers in contiguous memory, and 1628 * possibly the PIM REGISTER header 1629 */ 1630 #ifndef PULLDOWN_TEST 1631 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1632 /* adjust pointer */ 1633 ip6 = mtod(m, struct ip6_hdr *); 1634 1635 /* adjust mbuf to point to the PIM header */ 1636 pim = (struct pim *)((caddr_t)ip6 + off); 1637 #else 1638 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1639 if (pim == NULL) { 1640 pim6stat.pim6s_rcv_tooshort++; 1641 return IPPROTO_DONE; 1642 } 1643 #endif 1644 1645 #define PIM6_CHECKSUM 1646 #ifdef PIM6_CHECKSUM 1647 { 1648 int cksumlen; 1649 1650 /* 1651 * Validate checksum. 1652 * If PIM REGISTER, exclude the data packet 1653 */ 1654 if (pim->pim_type == PIM_REGISTER) 1655 cksumlen = PIM_MINLEN; 1656 else 1657 cksumlen = pimlen; 1658 1659 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1660 ++pim6stat.pim6s_rcv_badsum; 1661 #ifdef MRT6DEBUG 1662 if (mrt6debug & DEBUG_PIM) 1663 log(LOG_DEBUG, 1664 "pim6_input: invalid checksum\n"); 1665 #endif 1666 m_freem(m); 1667 return (IPPROTO_DONE); 1668 } 1669 } 1670 #endif /* PIM_CHECKSUM */ 1671 1672 /* PIM version check */ 1673 if (pim->pim_ver != PIM_VERSION) { 1674 ++pim6stat.pim6s_rcv_badversion; 1675 #ifdef MRT6DEBUG 1676 log(LOG_ERR, 1677 "pim6_input: incorrect version %d, expecting %d\n", 1678 pim->pim_ver, PIM_VERSION); 1679 #endif 1680 m_freem(m); 1681 return (IPPROTO_DONE); 1682 } 1683 1684 if (pim->pim_type == PIM_REGISTER) { 1685 /* 1686 * since this is a REGISTER, we'll make a copy of the register 1687 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1688 * routing daemon. 1689 */ 1690 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1691 1692 struct mbuf *mcp; 1693 struct ip6_hdr *eip6; 1694 u_int32_t *reghdr; 1695 1696 ++pim6stat.pim6s_rcv_registers; 1697 1698 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1699 #ifdef MRT6DEBUG 1700 if (mrt6debug & DEBUG_PIM) 1701 log(LOG_DEBUG, 1702 "pim6_input: register mif not set: %d\n", 1703 reg_mif_num); 1704 #endif 1705 m_freem(m); 1706 return (IPPROTO_DONE); 1707 } 1708 1709 reghdr = (u_int32_t *)(pim + 1); 1710 1711 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1712 goto pim6_input_to_daemon; 1713 1714 /* 1715 * Validate length 1716 */ 1717 if (pimlen < PIM6_REG_MINLEN) { 1718 ++pim6stat.pim6s_rcv_tooshort; 1719 ++pim6stat.pim6s_rcv_badregisters; 1720 #ifdef MRT6DEBUG 1721 log(LOG_ERR, 1722 "pim6_input: register packet size too " 1723 "small %d from %s\n", 1724 pimlen, ip6_sprintf(&ip6->ip6_src)); 1725 #endif 1726 m_freem(m); 1727 return (IPPROTO_DONE); 1728 } 1729 1730 eip6 = (struct ip6_hdr *) (reghdr + 1); 1731 #ifdef MRT6DEBUG 1732 if (mrt6debug & DEBUG_PIM) 1733 log(LOG_DEBUG, 1734 "pim6_input[register], eip6: %s -> %s, " 1735 "eip6 plen %d\n", 1736 ip6_sprintf(&eip6->ip6_src), 1737 ip6_sprintf(&eip6->ip6_dst), 1738 ntohs(eip6->ip6_plen)); 1739 #endif 1740 1741 /* verify the version number of the inner packet */ 1742 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1743 ++pim6stat.pim6s_rcv_badregisters; 1744 #ifdef MRT6DEBUG 1745 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1746 "of the inner packet\n", 1747 (eip6->ip6_vfc & IPV6_VERSION)); 1748 #endif 1749 m_freem(m); 1750 return (IPPROTO_NONE); 1751 } 1752 1753 /* verify the inner packet is destined to a mcast group */ 1754 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1755 ++pim6stat.pim6s_rcv_badregisters; 1756 #ifdef MRT6DEBUG 1757 if (mrt6debug & DEBUG_PIM) 1758 log(LOG_DEBUG, 1759 "pim6_input: inner packet of register " 1760 "is not multicast %s\n", 1761 ip6_sprintf(&eip6->ip6_dst)); 1762 #endif 1763 m_freem(m); 1764 return (IPPROTO_DONE); 1765 } 1766 1767 /* 1768 * make a copy of the whole header to pass to the daemon later. 1769 */ 1770 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1771 if (mcp == NULL) { 1772 #ifdef MRT6DEBUG 1773 log(LOG_ERR, 1774 "pim6_input: pim register: " 1775 "could not copy register head\n"); 1776 #endif 1777 m_freem(m); 1778 return (IPPROTO_DONE); 1779 } 1780 1781 /* 1782 * forward the inner ip6 packet; point m_data at the inner ip6. 1783 */ 1784 m_adj(m, off + PIM_MINLEN); 1785 #ifdef MRT6DEBUG 1786 if (mrt6debug & DEBUG_PIM) { 1787 log(LOG_DEBUG, 1788 "pim6_input: forwarding decapsulated register: " 1789 "src %s, dst %s, mif %d\n", 1790 ip6_sprintf(&eip6->ip6_src), 1791 ip6_sprintf(&eip6->ip6_dst), 1792 reg_mif_num); 1793 } 1794 #endif 1795 1796 if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1797 dst.sin6_family, 0); 1798 1799 /* prepare the register head to send to the mrouting daemon */ 1800 m = mcp; 1801 } 1802 1803 /* 1804 * Pass the PIM message up to the daemon; if it is a register message 1805 * pass the 'head' only up to the daemon. This includes the 1806 * encapsulator ip6 header, pim header, register header and the 1807 * encapsulated ip6 header. 1808 */ 1809 pim6_input_to_daemon: 1810 rip6_input(&m, offp, proto); 1811 return (IPPROTO_DONE); 1812 } 1813