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. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 68 */ 69 70 /* 71 * IP multicast forwarding procedures 72 * 73 * Written by David Waitzman, BBN Labs, August 1988. 74 * Modified by Steve Deering, Stanford, February 1989. 75 * Modified by Mark J. Steiglitz, Stanford, May, 1991 76 * Modified by Van Jacobson, LBL, January 1993 77 * Modified by Ajit Thyagarajan, PARC, August 1993 78 * Modified by Bill Fenner, PARC, April 1994 79 * 80 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 81 */ 82 83 #include "opt_inet.h" 84 #include "opt_inet6.h" 85 86 #include <sys/param.h> 87 #include <sys/systm.h> 88 #include <sys/callout.h> 89 #include <sys/malloc.h> 90 #include <sys/mbuf.h> 91 #include <sys/socket.h> 92 #include <sys/socketvar.h> 93 #include <sys/sockio.h> 94 #include <sys/protosw.h> 95 #include <sys/errno.h> 96 #include <sys/time.h> 97 #include <sys/kernel.h> 98 #include <sys/syslog.h> 99 #include <sys/thread2.h> 100 101 #include <net/if.h> 102 #include <net/route.h> 103 #include <net/raw_cb.h> 104 #include <net/netisr2.h> 105 #include <net/netmsg2.h> 106 107 #include <netinet/in.h> 108 #include <netinet/in_var.h> 109 110 #include <netinet/ip6.h> 111 #include <netinet6/ip6_var.h> 112 #include <netinet6/ip6_mroute.h> 113 #include <netinet6/nd6.h> 114 #include <netinet6/pim6.h> 115 #include <netinet6/pim6_var.h> 116 117 #include <net/net_osdep.h> 118 119 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry"); 120 121 #define M_HASCL(m) ((m)->m_flags & M_EXT) 122 123 static int ip6_mdq (struct mbuf *, struct ifnet *, struct mf6c *); 124 static void phyint_send (struct ip6_hdr *, struct mif6 *, struct mbuf *); 125 126 static int set_pim6 (int *); 127 static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in6 *); 128 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 129 130 /* 131 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 132 * except for netstat or debugging purposes. 133 */ 134 struct socket *ip6_mrouter = NULL; 135 int ip6_mrouter_ver = 0; 136 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 137 struct mrt6stat mrt6stat; 138 139 #define NO_RTE_FOUND 0x1 140 #define RTE_FOUND 0x2 141 142 struct mf6c *mf6ctable[MF6CTBLSIZ]; 143 u_char n6expire[MF6CTBLSIZ]; 144 static struct mif6 mif6table[MAXMIFS]; 145 #ifdef MRT6DEBUG 146 u_int mrt6debug = 0; /* debug level */ 147 #define DEBUG_MFC 0x02 148 #define DEBUG_FORWARD 0x04 149 #define DEBUG_EXPIRE 0x08 150 #define DEBUG_XMIT 0x10 151 #define DEBUG_REG 0x20 152 #define DEBUG_PIM 0x40 153 #endif 154 155 static void expire_upcalls (void *); 156 static void expire_upcalls_dispatch(netmsg_t); 157 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 158 #define UPCALL_EXPIRE 6 /* number of timeouts */ 159 160 #ifdef INET 161 #ifdef MROUTING 162 extern struct socket *ip_mrouter; 163 #endif 164 #endif 165 166 /* 167 * 'Interfaces' associated with decapsulator (so we can tell 168 * packets that went through it from ones that get reflected 169 * by a broken gateway). These interfaces are never linked into 170 * the system ifnet list & no routes point to them. I.e., packets 171 * can't be sent this way. They only exist as a placeholder for 172 * multicast source verification. 173 */ 174 struct ifnet multicast_register_if; 175 176 #define ENCAP_HOPS 64 177 178 /* 179 * Private variables. 180 */ 181 static mifi_t nummifs = 0; 182 static mifi_t reg_mif_num = (mifi_t)-1; 183 184 static struct pim6stat pim6stat; 185 static int pim6; 186 187 /* 188 * Hash function for a source, group entry 189 */ 190 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 191 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 192 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 193 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 194 195 /* 196 * Find a route for a given origin IPv6 address and Multicast group address. 197 * Quality of service parameter to be added in the future!!! 198 */ 199 200 #define MF6CFIND(o, g, rt) do { \ 201 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 202 rt = NULL; \ 203 mrt6stat.mrt6s_mfc_lookups++; \ 204 while (_rt) { \ 205 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 206 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 207 (_rt->mf6c_stall == NULL)) { \ 208 rt = _rt; \ 209 break; \ 210 } \ 211 _rt = _rt->mf6c_next; \ 212 } \ 213 if (rt == NULL) { \ 214 mrt6stat.mrt6s_mfc_misses++; \ 215 } \ 216 } while (0) 217 218 /* 219 * Macros to compute elapsed time efficiently 220 * Borrowed from Van Jacobson's scheduling code 221 */ 222 #define TV_DELTA(a, b, delta) do { \ 223 int xxs; \ 224 \ 225 delta = (a).tv_usec - (b).tv_usec; \ 226 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 227 switch (xxs) { \ 228 case 2: \ 229 delta += 1000000; \ 230 /* FALLTHROUGH */ \ 231 case 1: \ 232 delta += 1000000; \ 233 break; \ 234 default: \ 235 delta += (1000000 * xxs); \ 236 } \ 237 } \ 238 } while (0) 239 240 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 241 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 242 243 #ifdef UPCALL_TIMING 244 #define UPCALL_MAX 50 245 u_long upcall_data[UPCALL_MAX + 1]; 246 static void collate(); 247 #endif /* UPCALL_TIMING */ 248 249 static int get_sg_cnt (struct sioc_sg_req6 *); 250 static int get_mif6_cnt (struct sioc_mif_req6 *); 251 static int ip6_mrouter_init (struct socket *, struct mbuf *, int); 252 static int add_m6if (struct mif6ctl *); 253 static int del_m6if (mifi_t *); 254 static int add_m6fc (struct mf6cctl *); 255 static int del_m6fc (struct mf6cctl *); 256 257 static struct callout expire_upcalls_ch; 258 static struct netmsg_base expire_upcalls_nmsg; 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 ASSERT_IN_NETISR(0); 413 414 #ifdef MRT6DEBUG 415 if (mrt6debug) 416 log(LOG_DEBUG, 417 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 418 so->so_type, so->so_proto->pr_protocol); 419 #endif 420 421 if (so->so_type != SOCK_RAW || 422 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 423 return EOPNOTSUPP; 424 425 if (!m || (m->m_len != sizeof(int *))) 426 return ENOPROTOOPT; 427 428 v = mtod(m, int *); 429 if (*v != 1) 430 return ENOPROTOOPT; 431 432 if (ip6_mrouter != NULL) 433 return EADDRINUSE; 434 435 ip6_mrouter = so; 436 ip6_mrouter_ver = cmd; 437 438 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 439 bzero((caddr_t)n6expire, sizeof(n6expire)); 440 441 pim6 = 0;/* used for stubbing out/in pim stuff */ 442 443 callout_init_mp(&expire_upcalls_ch); 444 netmsg_init(&expire_upcalls_nmsg, NULL, &netisr_adone_rport, 445 MSGF_PRIORITY | MSGF_DROPABLE, expire_upcalls_dispatch); 446 447 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 448 expire_upcalls, NULL); 449 450 #ifdef MRT6DEBUG 451 if (mrt6debug) 452 log(LOG_DEBUG, "ip6_mrouter_init\n"); 453 #endif 454 455 return 0; 456 } 457 458 /* 459 * Disable multicast routing 460 */ 461 int 462 ip6_mrouter_done(void) 463 { 464 mifi_t mifi; 465 int i; 466 struct ifnet *ifp; 467 struct in6_ifreq ifr; 468 struct mf6c *rt; 469 struct rtdetq *rte; 470 struct lwkt_msg *lmsg = &expire_upcalls_nmsg.lmsg; 471 472 ASSERT_IN_NETISR(0); 473 474 if (ip6_mrouter == NULL) 475 return EINVAL; 476 477 /* 478 * For each phyint in use, disable promiscuous reception of all IPv6 479 * multicasts. 480 */ 481 #ifdef INET 482 #ifdef MROUTING 483 /* 484 * If there is still IPv4 multicast routing daemon, 485 * we remain interfaces to receive all muliticasted packets. 486 * XXX: there may be an interface in which the IPv4 multicast 487 * daemon is not interested... 488 */ 489 if (!ip_mrouter) 490 #endif 491 #endif 492 { 493 for (mifi = 0; mifi < nummifs; mifi++) { 494 if (mif6table[mifi].m6_ifp && 495 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 496 ifr.ifr_addr.sin6_family = AF_INET6; 497 ifr.ifr_addr.sin6_addr = kin6addr_any; 498 ifp = mif6table[mifi].m6_ifp; 499 ifnet_serialize_all(ifp); 500 ifp->if_ioctl(ifp, SIOCDELMULTI, 501 (caddr_t)&ifr, NULL); 502 ifnet_deserialize_all(ifp); 503 } 504 } 505 } 506 #ifdef notyet 507 bzero((caddr_t)qtable, sizeof(qtable)); 508 bzero((caddr_t)tbftable, sizeof(tbftable)); 509 #endif 510 bzero((caddr_t)mif6table, sizeof(mif6table)); 511 nummifs = 0; 512 513 pim6 = 0; /* used to stub out/in pim specific code */ 514 515 callout_stop(&expire_upcalls_ch); 516 crit_enter(); 517 if ((lmsg->ms_flags & MSGF_DONE) == 0) 518 lwkt_dropmsg(lmsg); 519 crit_exit(); 520 521 /* 522 * Free all multicast forwarding cache entries. 523 */ 524 for (i = 0; i < MF6CTBLSIZ; i++) { 525 rt = mf6ctable[i]; 526 while (rt) { 527 struct mf6c *frt; 528 529 for (rte = rt->mf6c_stall; rte != NULL; ) { 530 struct rtdetq *n = rte->next; 531 532 m_freem(rte->m); 533 kfree(rte, M_MRTABLE); 534 rte = n; 535 } 536 frt = rt; 537 rt = rt->mf6c_next; 538 kfree(frt, M_MRTABLE); 539 } 540 } 541 542 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 543 544 /* 545 * Reset de-encapsulation cache 546 */ 547 reg_mif_num = -1; 548 549 ip6_mrouter = NULL; 550 ip6_mrouter_ver = 0; 551 552 #ifdef MRT6DEBUG 553 if (mrt6debug) 554 log(LOG_DEBUG, "ip6_mrouter_done\n"); 555 #endif 556 557 return 0; 558 } 559 560 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 561 562 /* 563 * Add a mif to the mif table 564 */ 565 static int 566 add_m6if(struct mif6ctl *mifcp) 567 { 568 struct mif6 *mifp; 569 struct ifnet *ifp; 570 int error; 571 #ifdef notyet 572 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 573 #endif 574 575 if (mifcp->mif6c_mifi >= MAXMIFS) 576 return EINVAL; 577 mifp = mif6table + mifcp->mif6c_mifi; 578 if (mifp->m6_ifp) 579 return EADDRINUSE; /* XXX: is it appropriate? */ 580 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 581 return ENXIO; 582 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 583 584 if (mifcp->mif6c_flags & MIFF_REGISTER) { 585 if (reg_mif_num == (mifi_t)-1) { 586 strlcpy(multicast_register_if.if_xname, "register_mif", 587 IFNAMSIZ); 588 multicast_register_if.if_flags |= IFF_LOOPBACK; 589 multicast_register_if.if_index = mifcp->mif6c_mifi; 590 reg_mif_num = mifcp->mif6c_mifi; 591 } 592 593 ifp = &multicast_register_if; 594 595 } /* if REGISTER */ 596 else { 597 /* Make sure the interface supports multicast */ 598 if ((ifp->if_flags & IFF_MULTICAST) == 0) 599 return EOPNOTSUPP; 600 601 crit_enter(); 602 error = if_allmulti(ifp, 1); 603 crit_exit(); 604 if (error) 605 return error; 606 } 607 608 crit_enter(); 609 mifp->m6_flags = mifcp->mif6c_flags; 610 mifp->m6_ifp = ifp; 611 #ifdef notyet 612 /* scaling up here allows division by 1024 in critical code */ 613 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 614 #endif 615 /* initialize per mif pkt counters */ 616 mifp->m6_pkt_in = 0; 617 mifp->m6_pkt_out = 0; 618 mifp->m6_bytes_in = 0; 619 mifp->m6_bytes_out = 0; 620 crit_exit(); 621 622 /* Adjust nummifs up if the mifi is higher than nummifs */ 623 if (nummifs <= mifcp->mif6c_mifi) 624 nummifs = mifcp->mif6c_mifi + 1; 625 626 #ifdef MRT6DEBUG 627 if (mrt6debug) 628 log(LOG_DEBUG, 629 "add_mif #%d, phyint %s\n", 630 mifcp->mif6c_mifi, 631 ifp->if_xname); 632 #endif 633 634 return 0; 635 } 636 637 /* 638 * Delete a mif from the mif table 639 */ 640 static int 641 del_m6if(mifi_t *mifip) 642 { 643 struct mif6 *mifp = mif6table + *mifip; 644 mifi_t mifi; 645 struct ifnet *ifp; 646 647 if (*mifip >= nummifs) 648 return EINVAL; 649 if (mifp->m6_ifp == NULL) 650 return EINVAL; 651 652 crit_enter(); 653 654 if (!(mifp->m6_flags & MIFF_REGISTER)) { 655 /* 656 * XXX: what if there is yet IPv4 multicast daemon 657 * using the interface? 658 */ 659 ifp = mifp->m6_ifp; 660 661 if_allmulti(ifp, 0); 662 } 663 664 #ifdef notyet 665 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 666 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 667 #endif 668 bzero((caddr_t)mifp, sizeof (*mifp)); 669 670 /* Adjust nummifs down */ 671 for (mifi = nummifs; mifi > 0; mifi--) 672 if (mif6table[mifi - 1].m6_ifp) 673 break; 674 nummifs = mifi; 675 676 crit_exit(); 677 678 #ifdef MRT6DEBUG 679 if (mrt6debug) 680 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 681 #endif 682 683 return 0; 684 } 685 686 /* 687 * Add an mfc entry 688 */ 689 static int 690 add_m6fc(struct mf6cctl *mfccp) 691 { 692 struct mf6c *rt; 693 u_long hash; 694 struct rtdetq *rte; 695 u_short nstl; 696 697 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 698 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 699 700 /* If an entry already exists, just update the fields */ 701 if (rt) { 702 #ifdef MRT6DEBUG 703 if (mrt6debug & DEBUG_MFC) 704 log(LOG_DEBUG, 705 "add_m6fc no upcall h %d o %s g %s p %x\n", 706 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 707 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 708 mfccp->mf6cc_parent); 709 #endif 710 711 crit_enter(); 712 rt->mf6c_parent = mfccp->mf6cc_parent; 713 rt->mf6c_ifset = mfccp->mf6cc_ifset; 714 crit_exit(); 715 return 0; 716 } 717 718 /* 719 * Find the entry for which the upcall was made and update 720 */ 721 crit_enter(); 722 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 723 mfccp->mf6cc_mcastgrp.sin6_addr); 724 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 725 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 726 &mfccp->mf6cc_origin.sin6_addr) && 727 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 728 &mfccp->mf6cc_mcastgrp.sin6_addr) && 729 (rt->mf6c_stall != NULL)) { 730 731 if (nstl++) 732 log(LOG_ERR, 733 "add_m6fc: %s o %s g %s p %x dbx %p\n", 734 "multiple kernel entries", 735 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 736 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 737 mfccp->mf6cc_parent, rt->mf6c_stall); 738 739 #ifdef MRT6DEBUG 740 if (mrt6debug & DEBUG_MFC) 741 log(LOG_DEBUG, 742 "add_m6fc o %s g %s p %x dbg %x\n", 743 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 744 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 745 mfccp->mf6cc_parent, rt->mf6c_stall); 746 #endif 747 748 rt->mf6c_origin = mfccp->mf6cc_origin; 749 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 750 rt->mf6c_parent = mfccp->mf6cc_parent; 751 rt->mf6c_ifset = mfccp->mf6cc_ifset; 752 /* initialize pkt counters per src-grp */ 753 rt->mf6c_pkt_cnt = 0; 754 rt->mf6c_byte_cnt = 0; 755 rt->mf6c_wrong_if = 0; 756 757 rt->mf6c_expire = 0; /* Don't clean this guy up */ 758 n6expire[hash]--; 759 760 /* free packets Qed at the end of this entry */ 761 for (rte = rt->mf6c_stall; rte != NULL; ) { 762 struct rtdetq *n = rte->next; 763 ip6_mdq(rte->m, rte->ifp, rt); 764 m_freem(rte->m); 765 #ifdef UPCALL_TIMING 766 collate(&(rte->t)); 767 #endif /* UPCALL_TIMING */ 768 kfree(rte, M_MRTABLE); 769 rte = n; 770 } 771 rt->mf6c_stall = NULL; 772 } 773 } 774 775 /* 776 * It is possible that an entry is being inserted without an upcall 777 */ 778 if (nstl == 0) { 779 #ifdef MRT6DEBUG 780 if (mrt6debug & DEBUG_MFC) 781 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 782 hash, 783 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 784 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 785 mfccp->mf6cc_parent); 786 #endif 787 788 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 789 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 790 &mfccp->mf6cc_origin.sin6_addr)&& 791 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 792 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 793 794 rt->mf6c_origin = mfccp->mf6cc_origin; 795 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 796 rt->mf6c_parent = mfccp->mf6cc_parent; 797 rt->mf6c_ifset = mfccp->mf6cc_ifset; 798 /* initialize pkt counters per src-grp */ 799 rt->mf6c_pkt_cnt = 0; 800 rt->mf6c_byte_cnt = 0; 801 rt->mf6c_wrong_if = 0; 802 803 if (rt->mf6c_expire) 804 n6expire[hash]--; 805 rt->mf6c_expire = 0; 806 } 807 } 808 if (rt == NULL) { 809 /* no upcall, so make a new entry */ 810 rt = (struct mf6c *)kmalloc(sizeof(*rt), M_MRTABLE, 811 M_NOWAIT); 812 if (rt == NULL) { 813 crit_exit(); 814 return ENOBUFS; 815 } 816 817 /* insert new entry at head of hash chain */ 818 rt->mf6c_origin = mfccp->mf6cc_origin; 819 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 820 rt->mf6c_parent = mfccp->mf6cc_parent; 821 rt->mf6c_ifset = mfccp->mf6cc_ifset; 822 /* initialize pkt counters per src-grp */ 823 rt->mf6c_pkt_cnt = 0; 824 rt->mf6c_byte_cnt = 0; 825 rt->mf6c_wrong_if = 0; 826 rt->mf6c_expire = 0; 827 rt->mf6c_stall = NULL; 828 829 /* link into table */ 830 rt->mf6c_next = mf6ctable[hash]; 831 mf6ctable[hash] = rt; 832 } 833 } 834 crit_exit(); 835 return 0; 836 } 837 838 #ifdef UPCALL_TIMING 839 /* 840 * collect delay statistics on the upcalls 841 */ 842 static void 843 collate(struct timeval *t) 844 { 845 u_long d; 846 struct timeval tp; 847 u_long delta; 848 849 GET_TIME(tp); 850 851 if (TV_LT(*t, tp)) 852 { 853 TV_DELTA(tp, *t, delta); 854 855 d = delta >> 10; 856 if (d > UPCALL_MAX) 857 d = UPCALL_MAX; 858 859 ++upcall_data[d]; 860 } 861 } 862 #endif /* UPCALL_TIMING */ 863 864 /* 865 * Delete an mfc entry 866 */ 867 static int 868 del_m6fc(struct mf6cctl *mfccp) 869 { 870 struct sockaddr_in6 origin; 871 struct sockaddr_in6 mcastgrp; 872 struct mf6c *rt; 873 struct mf6c **nptr; 874 u_long hash; 875 876 origin = mfccp->mf6cc_origin; 877 mcastgrp = mfccp->mf6cc_mcastgrp; 878 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 879 880 #ifdef MRT6DEBUG 881 if (mrt6debug & DEBUG_MFC) 882 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 883 ip6_sprintf(&origin.sin6_addr), 884 ip6_sprintf(&mcastgrp.sin6_addr)); 885 #endif 886 887 crit_enter(); 888 889 nptr = &mf6ctable[hash]; 890 while ((rt = *nptr) != NULL) { 891 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 892 &rt->mf6c_origin.sin6_addr) && 893 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 894 &rt->mf6c_mcastgrp.sin6_addr) && 895 rt->mf6c_stall == NULL) 896 break; 897 898 nptr = &rt->mf6c_next; 899 } 900 if (rt == NULL) { 901 crit_exit(); 902 return EADDRNOTAVAIL; 903 } 904 905 *nptr = rt->mf6c_next; 906 kfree(rt, M_MRTABLE); 907 908 crit_exit(); 909 910 return 0; 911 } 912 913 static int 914 socket_send(struct socket *so, struct mbuf *mm, struct sockaddr_in6 *src) 915 { 916 if (so) { 917 lwkt_gettoken(&so->so_rcv.ssb_token); 918 if (ssb_appendaddr(&so->so_rcv, 919 (struct sockaddr *)src, 920 mm, NULL) != 0) { 921 sorwakeup(so); 922 lwkt_reltoken(&so->so_rcv.ssb_token); 923 return 0; 924 } 925 lwkt_reltoken(&so->so_rcv.ssb_token); 926 } 927 m_freem(mm); 928 return -1; 929 } 930 931 /* 932 * IPv6 multicast forwarding function. This function assumes that the packet 933 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 934 * pointed to by "ifp", and the packet is to be relayed to other networks 935 * that have members of the packet's destination IPv6 multicast group. 936 * 937 * The packet is returned unscathed to the caller, unless it is 938 * erroneous, in which case a non-zero return value tells the caller to 939 * discard it. 940 */ 941 942 int 943 ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 944 { 945 struct mf6c *rt; 946 struct mif6 *mifp; 947 struct mbuf *mm; 948 mifi_t mifi; 949 950 #ifdef MRT6DEBUG 951 if (mrt6debug & DEBUG_FORWARD) 952 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 953 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 954 ifp->if_index); 955 #endif 956 957 /* 958 * Don't forward a packet with Hop limit of zero or one, 959 * or a packet destined to a local-only group. 960 */ 961 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 962 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 963 return 0; 964 ip6->ip6_hlim--; 965 966 /* 967 * Source address check: do not forward packets with unspecified 968 * source. It was discussed in July 2000, on ipngwg mailing list. 969 * This is rather more serious than unicast cases, because some 970 * MLD packets can be sent with the unspecified source address 971 * (although such packets must normally set 1 to the hop limit field). 972 */ 973 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 974 ip6stat.ip6s_cantforward++; 975 if (ip6_log_time + ip6_log_interval < time_uptime) { 976 ip6_log_time = time_uptime; 977 log(LOG_DEBUG, 978 "cannot forward " 979 "from %s to %s nxt %d received on %s\n", 980 ip6_sprintf(&ip6->ip6_src), 981 ip6_sprintf(&ip6->ip6_dst), 982 ip6->ip6_nxt, 983 if_name(m->m_pkthdr.rcvif)); 984 } 985 return 0; 986 } 987 988 /* 989 * Determine forwarding mifs from the forwarding cache table 990 */ 991 crit_enter(); 992 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 993 994 /* Entry exists, so forward if necessary */ 995 if (rt) { 996 crit_exit(); 997 return (ip6_mdq(m, ifp, rt)); 998 } else { 999 /* 1000 * If we don't have a route for packet's origin, 1001 * Make a copy of the packet & 1002 * send message to routing daemon 1003 */ 1004 1005 struct mbuf *mb0; 1006 struct rtdetq *rte; 1007 u_long hash; 1008 /* int i, npkts;*/ 1009 #ifdef UPCALL_TIMING 1010 struct timeval tp; 1011 1012 GET_TIME(tp); 1013 #endif /* UPCALL_TIMING */ 1014 1015 mrt6stat.mrt6s_no_route++; 1016 #ifdef MRT6DEBUG 1017 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1018 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1019 ip6_sprintf(&ip6->ip6_src), 1020 ip6_sprintf(&ip6->ip6_dst)); 1021 #endif 1022 1023 /* 1024 * Allocate mbufs early so that we don't do extra work if we 1025 * are just going to fail anyway. 1026 */ 1027 rte = (struct rtdetq *)kmalloc(sizeof(*rte), M_MRTABLE, 1028 M_NOWAIT); 1029 if (rte == NULL) { 1030 crit_exit(); 1031 return ENOBUFS; 1032 } 1033 mb0 = m_copy(m, 0, M_COPYALL); 1034 /* 1035 * Pullup packet header if needed before storing it, 1036 * as other references may modify it in the meantime. 1037 */ 1038 if (mb0 && 1039 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1040 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1041 if (mb0 == NULL) { 1042 kfree(rte, M_MRTABLE); 1043 crit_exit(); 1044 return ENOBUFS; 1045 } 1046 1047 /* is there an upcall waiting for this packet? */ 1048 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1049 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1050 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1051 &rt->mf6c_origin.sin6_addr) && 1052 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1053 &rt->mf6c_mcastgrp.sin6_addr) && 1054 (rt->mf6c_stall != NULL)) 1055 break; 1056 } 1057 1058 if (rt == NULL) { 1059 struct mrt6msg *im; 1060 #ifdef MRT6_OINIT 1061 struct omrt6msg *oim; 1062 #endif 1063 1064 /* no upcall, so make a new entry */ 1065 rt = (struct mf6c *)kmalloc(sizeof(*rt), M_MRTABLE, 1066 M_NOWAIT); 1067 if (rt == NULL) { 1068 kfree(rte, M_MRTABLE); 1069 m_freem(mb0); 1070 crit_exit(); 1071 return ENOBUFS; 1072 } 1073 /* 1074 * Make a copy of the header to send to the user 1075 * level process 1076 */ 1077 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1078 1079 if (mm == NULL) { 1080 kfree(rte, M_MRTABLE); 1081 m_freem(mb0); 1082 kfree(rt, M_MRTABLE); 1083 crit_exit(); 1084 return ENOBUFS; 1085 } 1086 1087 /* 1088 * Send message to routing daemon 1089 */ 1090 sin6.sin6_addr = ip6->ip6_src; 1091 1092 im = NULL; 1093 #ifdef MRT6_OINIT 1094 oim = NULL; 1095 #endif 1096 switch (ip6_mrouter_ver) { 1097 #ifdef MRT6_OINIT 1098 case MRT6_OINIT: 1099 oim = mtod(mm, struct omrt6msg *); 1100 oim->im6_msgtype = MRT6MSG_NOCACHE; 1101 oim->im6_mbz = 0; 1102 break; 1103 #endif 1104 case MRT6_INIT: 1105 im = mtod(mm, struct mrt6msg *); 1106 im->im6_msgtype = MRT6MSG_NOCACHE; 1107 im->im6_mbz = 0; 1108 break; 1109 default: 1110 kfree(rte, M_MRTABLE); 1111 m_freem(mb0); 1112 kfree(rt, M_MRTABLE); 1113 crit_exit(); 1114 return EINVAL; 1115 } 1116 1117 #ifdef MRT6DEBUG 1118 if (mrt6debug & DEBUG_FORWARD) 1119 log(LOG_DEBUG, 1120 "getting the iif info in the kernel\n"); 1121 #endif 1122 1123 for (mifp = mif6table, mifi = 0; 1124 mifi < nummifs && mifp->m6_ifp != ifp; 1125 mifp++, mifi++) 1126 ; 1127 1128 switch (ip6_mrouter_ver) { 1129 #ifdef MRT6_OINIT 1130 case MRT6_OINIT: 1131 oim->im6_mif = mifi; 1132 break; 1133 #endif 1134 case MRT6_INIT: 1135 im->im6_mif = mifi; 1136 break; 1137 } 1138 1139 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1140 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1141 "socket queue full\n"); 1142 mrt6stat.mrt6s_upq_sockfull++; 1143 kfree(rte, M_MRTABLE); 1144 m_freem(mb0); 1145 kfree(rt, M_MRTABLE); 1146 crit_exit(); 1147 return ENOBUFS; 1148 } 1149 1150 mrt6stat.mrt6s_upcalls++; 1151 1152 /* insert new entry at head of hash chain */ 1153 bzero(rt, sizeof(*rt)); 1154 rt->mf6c_origin.sin6_family = AF_INET6; 1155 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1156 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1157 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1158 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1159 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1160 rt->mf6c_expire = UPCALL_EXPIRE; 1161 n6expire[hash]++; 1162 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1163 1164 /* link into table */ 1165 rt->mf6c_next = mf6ctable[hash]; 1166 mf6ctable[hash] = rt; 1167 /* Add this entry to the end of the queue */ 1168 rt->mf6c_stall = rte; 1169 } else { 1170 /* determine if q has overflowed */ 1171 struct rtdetq **p; 1172 int npkts = 0; 1173 1174 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1175 if (++npkts > MAX_UPQ6) { 1176 mrt6stat.mrt6s_upq_ovflw++; 1177 kfree(rte, M_MRTABLE); 1178 m_freem(mb0); 1179 crit_exit(); 1180 return 0; 1181 } 1182 1183 /* Add this entry to the end of the queue */ 1184 *p = rte; 1185 } 1186 1187 rte->next = NULL; 1188 rte->m = mb0; 1189 rte->ifp = ifp; 1190 #ifdef UPCALL_TIMING 1191 rte->t = tp; 1192 #endif /* UPCALL_TIMING */ 1193 1194 crit_exit(); 1195 1196 return 0; 1197 } 1198 } 1199 1200 /* 1201 * Clean up cache entries if upcalls are not serviced 1202 * Call from the Slow Timeout mechanism, every half second. 1203 */ 1204 static void 1205 expire_upcalls_dispatch(netmsg_t nmsg) 1206 { 1207 struct rtdetq *rte; 1208 struct mf6c *mfc, **nptr; 1209 int i; 1210 1211 ASSERT_IN_NETISR(0); 1212 1213 /* Reply ASAP */ 1214 crit_enter(); 1215 lwkt_replymsg(&nmsg->lmsg, 0); 1216 crit_exit(); 1217 1218 for (i = 0; i < MF6CTBLSIZ; i++) { 1219 if (n6expire[i] == 0) 1220 continue; 1221 nptr = &mf6ctable[i]; 1222 while ((mfc = *nptr) != NULL) { 1223 rte = mfc->mf6c_stall; 1224 /* 1225 * Skip real cache entries 1226 * Make sure it wasn't marked to not expire (shouldn't happen) 1227 * If it expires now 1228 */ 1229 if (rte != NULL && 1230 mfc->mf6c_expire != 0 && 1231 --mfc->mf6c_expire == 0) { 1232 #ifdef MRT6DEBUG 1233 if (mrt6debug & DEBUG_EXPIRE) 1234 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1235 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1236 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1237 #endif 1238 /* 1239 * drop all the packets 1240 * free the mbuf with the pkt, if, timing info 1241 */ 1242 do { 1243 struct rtdetq *n = rte->next; 1244 m_freem(rte->m); 1245 kfree(rte, M_MRTABLE); 1246 rte = n; 1247 } while (rte != NULL); 1248 mrt6stat.mrt6s_cache_cleanups++; 1249 n6expire[i]--; 1250 1251 *nptr = mfc->mf6c_next; 1252 kfree(mfc, M_MRTABLE); 1253 } else { 1254 nptr = &mfc->mf6c_next; 1255 } 1256 } 1257 } 1258 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1259 expire_upcalls, NULL); 1260 } 1261 1262 static void 1263 expire_upcalls(void *arg __unused) 1264 { 1265 struct lwkt_msg *lmsg = &expire_upcalls_nmsg.lmsg; 1266 1267 KASSERT(mycpuid == 0, ("expire upcalls timer not on cpu0")); 1268 1269 crit_enter(); 1270 if (lmsg->ms_flags & MSGF_DONE) 1271 lwkt_sendmsg_oncpu(netisr_cpuport(0), lmsg); 1272 crit_exit(); 1273 } 1274 1275 /* 1276 * Packet forwarding routine once entry in the cache is made 1277 */ 1278 static int 1279 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1280 { 1281 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1282 mifi_t mifi, iif; 1283 struct mif6 *mifp; 1284 int plen = m->m_pkthdr.len; 1285 u_int32_t dscopein, sscopein; 1286 1287 /* 1288 * Macro to send packet on mif. Since RSVP packets don't get counted on 1289 * input, they shouldn't get counted on output, so statistics keeping is 1290 * separate. 1291 */ 1292 1293 #define MC6_SEND(ip6, mifp, m) do { \ 1294 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1295 register_send((ip6), (mifp), (m)); \ 1296 else \ 1297 phyint_send((ip6), (mifp), (m)); \ 1298 } while (0) 1299 1300 /* 1301 * Don't forward if it didn't arrive from the parent mif 1302 * for its origin. 1303 */ 1304 mifi = rt->mf6c_parent; 1305 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1306 /* came in the wrong interface */ 1307 #ifdef MRT6DEBUG 1308 if (mrt6debug & DEBUG_FORWARD) 1309 log(LOG_DEBUG, 1310 "wrong if: ifid %d mifi %d mififid %x\n", 1311 ifp->if_index, mifi, 1312 mif6table[mifi].m6_ifp->if_index); 1313 #endif 1314 mrt6stat.mrt6s_wrong_if++; 1315 rt->mf6c_wrong_if++; 1316 /* 1317 * If we are doing PIM processing, and we are forwarding 1318 * packets on this interface, send a message to the 1319 * routing daemon. 1320 */ 1321 /* have to make sure this is a valid mif */ 1322 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1323 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1324 /* 1325 * Check the M_LOOP flag to avoid an 1326 * unnecessary PIM assert. 1327 * XXX: M_LOOP is an ad-hoc hack... 1328 */ 1329 static struct sockaddr_in6 sin6 = 1330 { sizeof(sin6), AF_INET6 }; 1331 1332 struct mbuf *mm; 1333 struct mrt6msg *im; 1334 #ifdef MRT6_OINIT 1335 struct omrt6msg *oim; 1336 #endif 1337 1338 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1339 if (mm && 1340 (M_HASCL(mm) || 1341 mm->m_len < sizeof(struct ip6_hdr))) 1342 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1343 if (mm == NULL) 1344 return ENOBUFS; 1345 1346 #ifdef MRT6_OINIT 1347 oim = NULL; 1348 #endif 1349 im = NULL; 1350 switch (ip6_mrouter_ver) { 1351 #ifdef MRT6_OINIT 1352 case MRT6_OINIT: 1353 oim = mtod(mm, struct omrt6msg *); 1354 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1355 oim->im6_mbz = 0; 1356 break; 1357 #endif 1358 case MRT6_INIT: 1359 im = mtod(mm, struct mrt6msg *); 1360 im->im6_msgtype = MRT6MSG_WRONGMIF; 1361 im->im6_mbz = 0; 1362 break; 1363 default: 1364 m_freem(mm); 1365 return EINVAL; 1366 } 1367 1368 for (mifp = mif6table, iif = 0; 1369 iif < nummifs && mifp && 1370 mifp->m6_ifp != ifp; 1371 mifp++, iif++) 1372 ; 1373 1374 switch (ip6_mrouter_ver) { 1375 #ifdef MRT6_OINIT 1376 case MRT6_OINIT: 1377 oim->im6_mif = iif; 1378 sin6.sin6_addr = oim->im6_src; 1379 break; 1380 #endif 1381 case MRT6_INIT: 1382 im->im6_mif = iif; 1383 sin6.sin6_addr = im->im6_src; 1384 break; 1385 } 1386 1387 mrt6stat.mrt6s_upcalls++; 1388 1389 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1390 #ifdef MRT6DEBUG 1391 if (mrt6debug) 1392 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1393 #endif 1394 ++mrt6stat.mrt6s_upq_sockfull; 1395 return ENOBUFS; 1396 } /* if socket Q full */ 1397 } /* if PIM */ 1398 return 0; 1399 } /* if wrong iif */ 1400 1401 /* If I sourced this packet, it counts as output, else it was input. */ 1402 if (m->m_pkthdr.rcvif == NULL) { 1403 /* XXX: is rcvif really NULL when output?? */ 1404 mif6table[mifi].m6_pkt_out++; 1405 mif6table[mifi].m6_bytes_out += plen; 1406 } else { 1407 mif6table[mifi].m6_pkt_in++; 1408 mif6table[mifi].m6_bytes_in += plen; 1409 } 1410 rt->mf6c_pkt_cnt++; 1411 rt->mf6c_byte_cnt += plen; 1412 1413 /* 1414 * For each mif, forward a copy of the packet if there are group 1415 * members downstream on the interface. 1416 */ 1417 if (in6_addr2zoneid(ifp, &ip6->ip6_dst, &dscopein) || 1418 in6_addr2zoneid(ifp, &ip6->ip6_src, &sscopein)) 1419 return (EINVAL); 1420 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1421 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1422 u_int32_t dscopeout, sscopeout; 1423 1424 /* 1425 * check if the outgoing packet is going to break 1426 * a scope boundary. 1427 * XXX For packets through PIM register tunnel 1428 * interface, we believe a routing daemon. 1429 */ 1430 if (!(mif6table[rt->mf6c_parent].m6_flags & 1431 MIFF_REGISTER) && 1432 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1433 if (in6_addr2zoneid(mif6table[mifi].m6_ifp, 1434 &ip6->ip6_dst, 1435 &dscopeout) || 1436 in6_addr2zoneid(mif6table[mifi].m6_ifp, 1437 &ip6->ip6_src, 1438 &sscopeout) || 1439 dscopein != dscopeout || 1440 sscopein != sscopeout) { 1441 ip6stat.ip6s_badscope++; 1442 continue; 1443 } 1444 } 1445 1446 mifp->m6_pkt_out++; 1447 mifp->m6_bytes_out += plen; 1448 MC6_SEND(ip6, mifp, m); 1449 } 1450 } 1451 return 0; 1452 } 1453 1454 static void 1455 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1456 { 1457 struct mbuf *mb_copy; 1458 struct ifnet *ifp = mifp->m6_ifp; 1459 int error = 0; 1460 static struct route_in6 ro; 1461 struct in6_multi *in6m; 1462 struct sockaddr_in6 *dst6; 1463 u_long linkmtu; 1464 1465 crit_enter(); /* needs to protect static "ro" below. */ 1466 1467 /* 1468 * Make a new reference to the packet; make sure that 1469 * the IPv6 header is actually copied, not just referenced, 1470 * so that ip6_output() only scribbles on the copy. 1471 */ 1472 mb_copy = m_copy(m, 0, M_COPYALL); 1473 if (mb_copy && 1474 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1475 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1476 if (mb_copy == NULL) { 1477 crit_exit(); 1478 return; 1479 } 1480 /* set MCAST flag to the outgoing packet */ 1481 mb_copy->m_flags |= M_MCAST; 1482 1483 /* 1484 * If we sourced the packet, call ip6_output since we may devide 1485 * the packet into fragments when the packet is too big for the 1486 * outgoing interface. 1487 * Otherwise, we can simply send the packet to the interface 1488 * sending queue. 1489 */ 1490 if (m->m_pkthdr.rcvif == NULL) { 1491 struct ip6_moptions im6o; 1492 1493 im6o.im6o_multicast_ifp = ifp; 1494 /* XXX: ip6_output will override ip6->ip6_hlim */ 1495 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1496 im6o.im6o_multicast_loop = 1; 1497 error = ip6_output(mb_copy, NULL, &ro, 1498 IPV6_FORWARDING, &im6o, NULL, NULL); 1499 1500 #ifdef MRT6DEBUG 1501 if (mrt6debug & DEBUG_XMIT) 1502 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1503 mifp - mif6table, error); 1504 #endif 1505 crit_exit(); 1506 return; 1507 } 1508 1509 /* 1510 * If we belong to the destination multicast group 1511 * on the outgoing interface, loop back a copy. 1512 */ 1513 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1514 in6m = IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp); 1515 if (in6m != NULL) { 1516 dst6->sin6_len = sizeof(struct sockaddr_in6); 1517 dst6->sin6_family = AF_INET6; 1518 dst6->sin6_addr = ip6->ip6_dst; 1519 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1520 } 1521 /* 1522 * Put the packet into the sending queue of the outgoing interface 1523 * if it would fit in the MTU of the interface. 1524 */ 1525 linkmtu = IN6_LINKMTU(ifp); 1526 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1527 dst6->sin6_len = sizeof(struct sockaddr_in6); 1528 dst6->sin6_family = AF_INET6; 1529 dst6->sin6_addr = ip6->ip6_dst; 1530 /* 1531 * We just call if_output instead of nd6_output here, since 1532 * we need no ND for a multicast forwarded packet...right? 1533 */ 1534 error = ifp->if_output(ifp, mb_copy, 1535 (struct sockaddr *)&ro.ro_dst, NULL); 1536 #ifdef MRT6DEBUG 1537 if (mrt6debug & DEBUG_XMIT) 1538 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1539 mifp - mif6table, error); 1540 #endif 1541 } else { 1542 #ifdef MULTICAST_PMTUD 1543 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1544 #else 1545 #ifdef MRT6DEBUG 1546 if (mrt6debug & DEBUG_XMIT) 1547 log(LOG_DEBUG, 1548 "phyint_send: packet too big on %s o %s g %s" 1549 " size %d(discarded)\n", 1550 if_name(ifp), 1551 ip6_sprintf(&ip6->ip6_src), 1552 ip6_sprintf(&ip6->ip6_dst), 1553 mb_copy->m_pkthdr.len); 1554 #endif /* MRT6DEBUG */ 1555 m_freem(mb_copy); /* simply discard the packet */ 1556 #endif 1557 } 1558 1559 crit_exit(); 1560 } 1561 1562 static int 1563 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1564 { 1565 struct mbuf *mm; 1566 int i, len = m->m_pkthdr.len; 1567 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1568 struct mrt6msg *im6; 1569 1570 #ifdef MRT6DEBUG 1571 if (mrt6debug) 1572 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1573 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1574 #endif 1575 ++pim6stat.pim6s_snd_registers; 1576 1577 /* Make a copy of the packet to send to the user level process */ 1578 MGETHDR(mm, M_NOWAIT, MT_HEADER); 1579 if (mm == NULL) 1580 return ENOBUFS; 1581 mm->m_pkthdr.rcvif = NULL; 1582 mm->m_data += max_linkhdr; 1583 mm->m_len = sizeof(struct ip6_hdr); 1584 1585 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1586 m_freem(mm); 1587 return ENOBUFS; 1588 } 1589 i = MHLEN - M_LEADINGSPACE(mm); 1590 if (i > len) 1591 i = len; 1592 mm = m_pullup(mm, i); 1593 if (mm == NULL) 1594 return ENOBUFS; 1595 /* TODO: check it! */ 1596 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1597 1598 /* 1599 * Send message to routing daemon 1600 */ 1601 sin6.sin6_addr = ip6->ip6_src; 1602 1603 im6 = mtod(mm, struct mrt6msg *); 1604 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1605 im6->im6_mbz = 0; 1606 1607 im6->im6_mif = mif - mif6table; 1608 1609 /* iif info is not given for reg. encap.n */ 1610 mrt6stat.mrt6s_upcalls++; 1611 1612 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1613 #ifdef MRT6DEBUG 1614 if (mrt6debug) 1615 log(LOG_WARNING, 1616 "register_send: ip6_mrouter socket queue full\n"); 1617 #endif 1618 ++mrt6stat.mrt6s_upq_sockfull; 1619 return ENOBUFS; 1620 } 1621 return 0; 1622 } 1623 1624 /* 1625 * PIM sparse mode hook 1626 * Receives the pim control messages, and passes them up to the listening 1627 * socket, using rip6_input. 1628 * The only message processed is the REGISTER pim message; the pim header 1629 * is stripped off, and the inner packet is passed to register_mforward. 1630 */ 1631 int 1632 pim6_input(struct mbuf **mp, int *offp, int proto) 1633 { 1634 struct pim *pim; /* pointer to a pim struct */ 1635 struct ip6_hdr *ip6; 1636 int pimlen; 1637 struct mbuf *m = *mp; 1638 int minlen; 1639 int off = *offp; 1640 1641 ++pim6stat.pim6s_rcv_total; 1642 1643 ip6 = mtod(m, struct ip6_hdr *); 1644 pimlen = m->m_pkthdr.len - *offp; 1645 1646 /* 1647 * Validate lengths 1648 */ 1649 if (pimlen < PIM_MINLEN) { 1650 ++pim6stat.pim6s_rcv_tooshort; 1651 #ifdef MRT6DEBUG 1652 if (mrt6debug & DEBUG_PIM) 1653 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1654 #endif 1655 m_freem(m); 1656 return (IPPROTO_DONE); 1657 } 1658 1659 /* 1660 * if the packet is at least as big as a REGISTER, go ahead 1661 * and grab the PIM REGISTER header size, to avoid another 1662 * possible m_pullup() later. 1663 * 1664 * PIM_MINLEN == pimhdr + u_int32 == 8 1665 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1666 */ 1667 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1668 1669 /* 1670 * Make sure that the IP6 and PIM headers in contiguous memory, and 1671 * possibly the PIM REGISTER header 1672 */ 1673 #ifndef PULLDOWN_TEST 1674 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1675 /* adjust pointer */ 1676 ip6 = mtod(m, struct ip6_hdr *); 1677 1678 /* adjust mbuf to point to the PIM header */ 1679 pim = (struct pim *)((caddr_t)ip6 + off); 1680 #else 1681 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1682 if (pim == NULL) { 1683 pim6stat.pim6s_rcv_tooshort++; 1684 return IPPROTO_DONE; 1685 } 1686 #endif 1687 1688 #define PIM6_CHECKSUM 1689 #ifdef PIM6_CHECKSUM 1690 { 1691 int cksumlen; 1692 1693 /* 1694 * Validate checksum. 1695 * If PIM REGISTER, exclude the data packet 1696 */ 1697 if (pim->pim_type == PIM_REGISTER) 1698 cksumlen = PIM_MINLEN; 1699 else 1700 cksumlen = pimlen; 1701 1702 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1703 ++pim6stat.pim6s_rcv_badsum; 1704 #ifdef MRT6DEBUG 1705 if (mrt6debug & DEBUG_PIM) 1706 log(LOG_DEBUG, 1707 "pim6_input: invalid checksum\n"); 1708 #endif 1709 m_freem(m); 1710 return (IPPROTO_DONE); 1711 } 1712 } 1713 #endif /* PIM_CHECKSUM */ 1714 1715 /* PIM version check */ 1716 if (pim->pim_ver != PIM_VERSION) { 1717 ++pim6stat.pim6s_rcv_badversion; 1718 #ifdef MRT6DEBUG 1719 log(LOG_ERR, 1720 "pim6_input: incorrect version %d, expecting %d\n", 1721 pim->pim_ver, PIM_VERSION); 1722 #endif 1723 m_freem(m); 1724 return (IPPROTO_DONE); 1725 } 1726 1727 if (pim->pim_type == PIM_REGISTER) { 1728 /* 1729 * since this is a REGISTER, we'll make a copy of the register 1730 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1731 * routing daemon. 1732 */ 1733 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1734 1735 struct mbuf *mcp; 1736 struct ip6_hdr *eip6; 1737 u_int32_t *reghdr; 1738 1739 ++pim6stat.pim6s_rcv_registers; 1740 1741 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1742 #ifdef MRT6DEBUG 1743 if (mrt6debug & DEBUG_PIM) 1744 log(LOG_DEBUG, 1745 "pim6_input: register mif not set: %d\n", 1746 reg_mif_num); 1747 #endif 1748 m_freem(m); 1749 return (IPPROTO_DONE); 1750 } 1751 1752 reghdr = (u_int32_t *)(pim + 1); 1753 1754 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1755 goto pim6_input_to_daemon; 1756 1757 /* 1758 * Validate length 1759 */ 1760 if (pimlen < PIM6_REG_MINLEN) { 1761 ++pim6stat.pim6s_rcv_tooshort; 1762 ++pim6stat.pim6s_rcv_badregisters; 1763 #ifdef MRT6DEBUG 1764 log(LOG_ERR, 1765 "pim6_input: register packet size too " 1766 "small %d from %s\n", 1767 pimlen, ip6_sprintf(&ip6->ip6_src)); 1768 #endif 1769 m_freem(m); 1770 return (IPPROTO_DONE); 1771 } 1772 1773 eip6 = (struct ip6_hdr *) (reghdr + 1); 1774 #ifdef MRT6DEBUG 1775 if (mrt6debug & DEBUG_PIM) 1776 log(LOG_DEBUG, 1777 "pim6_input[register], eip6: %s -> %s, " 1778 "eip6 plen %d\n", 1779 ip6_sprintf(&eip6->ip6_src), 1780 ip6_sprintf(&eip6->ip6_dst), 1781 ntohs(eip6->ip6_plen)); 1782 #endif 1783 1784 /* verify the version number of the inner packet */ 1785 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1786 ++pim6stat.pim6s_rcv_badregisters; 1787 #ifdef MRT6DEBUG 1788 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1789 "of the inner packet\n", 1790 (eip6->ip6_vfc & IPV6_VERSION)); 1791 #endif 1792 m_freem(m); 1793 return (IPPROTO_NONE); 1794 } 1795 1796 /* verify the inner packet is destined to a mcast group */ 1797 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1798 ++pim6stat.pim6s_rcv_badregisters; 1799 #ifdef MRT6DEBUG 1800 if (mrt6debug & DEBUG_PIM) 1801 log(LOG_DEBUG, 1802 "pim6_input: inner packet of register " 1803 "is not multicast %s\n", 1804 ip6_sprintf(&eip6->ip6_dst)); 1805 #endif 1806 m_freem(m); 1807 return (IPPROTO_DONE); 1808 } 1809 1810 /* 1811 * make a copy of the whole header to pass to the daemon later. 1812 */ 1813 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1814 if (mcp == NULL) { 1815 #ifdef MRT6DEBUG 1816 log(LOG_ERR, 1817 "pim6_input: pim register: " 1818 "could not copy register head\n"); 1819 #endif 1820 m_freem(m); 1821 return (IPPROTO_DONE); 1822 } 1823 1824 /* 1825 * forward the inner ip6 packet; point m_data at the inner ip6. 1826 */ 1827 m_adj(m, off + PIM_MINLEN); 1828 #ifdef MRT6DEBUG 1829 if (mrt6debug & DEBUG_PIM) { 1830 log(LOG_DEBUG, 1831 "pim6_input: forwarding decapsulated register: " 1832 "src %s, dst %s, mif %d\n", 1833 ip6_sprintf(&eip6->ip6_src), 1834 ip6_sprintf(&eip6->ip6_dst), 1835 reg_mif_num); 1836 } 1837 #endif 1838 1839 if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1840 dst.sin6_family, 0); 1841 1842 /* prepare the register head to send to the mrouting daemon */ 1843 m = mcp; 1844 } 1845 1846 /* 1847 * Pass the PIM message up to the daemon; if it is a register message 1848 * pass the 'head' only up to the daemon. This includes the 1849 * encapsulator ip6 header, pim header, register header and the 1850 * encapsulated ip6 header. 1851 */ 1852 pim6_input_to_daemon: 1853 rip6_input(&m, offp, proto); 1854 return (IPPROTO_DONE); 1855 } 1856