ip6_mroute.c revision 171260
1/* $FreeBSD: head/sys/netinet6/ip6_mroute.c 171260 2007-07-05 16:29:40Z delphij $ */ 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 * 4. 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/callout.h> 88#include <sys/errno.h> 89#include <sys/kernel.h> 90#include <sys/lock.h> 91#include <sys/malloc.h> 92#include <sys/mbuf.h> 93#include <sys/protosw.h> 94#include <sys/signalvar.h> 95#include <sys/socket.h> 96#include <sys/socketvar.h> 97#include <sys/sockio.h> 98#include <sys/sx.h> 99#include <sys/sysctl.h> 100#include <sys/syslog.h> 101#include <sys/systm.h> 102#include <sys/time.h> 103 104#include <net/if.h> 105#include <net/if_types.h> 106#include <net/raw_cb.h> 107#include <net/route.h> 108 109#include <netinet/in.h> 110#include <netinet/in_var.h> 111#include <netinet/icmp6.h> 112 113#include <netinet/ip6.h> 114#include <netinet6/ip6_var.h> 115#include <netinet6/scope6_var.h> 116#include <netinet6/nd6.h> 117#include <netinet6/ip6_mroute.h> 118#include <netinet6/ip6protosw.h> 119#include <netinet6/pim6.h> 120#include <netinet6/pim6_var.h> 121 122static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 123 124/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 125#define M_HASCL(m) ((m)->m_flags & M_EXT) 126 127static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 128static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 129 130static int set_pim6 __P((int *)); 131static int socket_send __P((struct socket *, struct mbuf *, 132 struct sockaddr_in6 *)); 133static int register_send __P((struct ip6_hdr *, struct mif6 *, 134 struct mbuf *)); 135 136extern struct domain inet6domain; 137 138/* XXX: referenced from ip_mroute.c for dynamically loading this code. */ 139struct ip6protosw in6_pim_protosw = { 140 .pr_type = SOCK_RAW, 141 .pr_domain = &inet6domain, 142 .pr_protocol = IPPROTO_PIM, 143 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 144 .pr_input = pim6_input, 145 .pr_output = rip6_output, 146 .pr_ctloutput = rip6_ctloutput, 147 .pr_usrreqs = &rip6_usrreqs 148}; 149 150static int ip6_mrouter_ver = 0; 151 152SYSCTL_DECL(_net_inet6); 153SYSCTL_DECL(_net_inet6_ip6); 154SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 155 156static struct mrt6stat mrt6stat; 157SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 158 &mrt6stat, mrt6stat, 159 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 160 161#define NO_RTE_FOUND 0x1 162#define RTE_FOUND 0x2 163 164static struct mf6c *mf6ctable[MF6CTBLSIZ]; 165SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 166 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 167 "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 168 "netinet6/ip6_mroute.h)"); 169 170static u_char n6expire[MF6CTBLSIZ]; 171 172static struct mif6 mif6table[MAXMIFS]; 173SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 174 &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]", 175 "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)"); 176 177#ifdef MRT6DEBUG 178static u_int mrt6debug = 0; /* debug level */ 179#define DEBUG_MFC 0x02 180#define DEBUG_FORWARD 0x04 181#define DEBUG_EXPIRE 0x08 182#define DEBUG_XMIT 0x10 183#define DEBUG_REG 0x20 184#define DEBUG_PIM 0x40 185#endif 186 187static void expire_upcalls __P((void *)); 188#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 189#define UPCALL_EXPIRE 6 /* number of timeouts */ 190 191#ifdef INET 192#ifdef MROUTING 193extern struct socket *ip_mrouter; 194#endif 195#endif 196 197/* 198 * 'Interfaces' associated with decapsulator (so we can tell 199 * packets that went through it from ones that get reflected 200 * by a broken gateway). Different from IPv4 register_if, 201 * these interfaces are linked into the system ifnet list, 202 * because per-interface IPv6 statistics are maintained in 203 * ifp->if_afdata. But it does not have any routes point 204 * to them. I.e., packets can't be sent this way. They 205 * only exist as a placeholder for multicast source 206 * verification. 207 */ 208static struct ifnet *multicast_register_if6; 209 210#define ENCAP_HOPS 64 211 212/* 213 * Private variables. 214 */ 215static mifi_t nummifs = 0; 216static mifi_t reg_mif_num = (mifi_t)-1; 217 218static struct pim6stat pim6stat; 219SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD, 220 &pim6stat, pim6stat, 221 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)"); 222 223static int pim6; 224 225/* 226 * Hash function for a source, group entry 227 */ 228#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 229 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 230 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 231 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 232 233/* 234 * Find a route for a given origin IPv6 address and Multicast group address. 235 */ 236#define MF6CFIND(o, g, rt) do { \ 237 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 238 rt = NULL; \ 239 mrt6stat.mrt6s_mfc_lookups++; \ 240 while (_rt) { \ 241 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 242 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 243 (_rt->mf6c_stall == NULL)) { \ 244 rt = _rt; \ 245 break; \ 246 } \ 247 _rt = _rt->mf6c_next; \ 248 } \ 249 if (rt == NULL) { \ 250 mrt6stat.mrt6s_mfc_misses++; \ 251 } \ 252} while (/*CONSTCOND*/ 0) 253 254/* 255 * Macros to compute elapsed time efficiently 256 * Borrowed from Van Jacobson's scheduling code 257 * XXX: replace with timersub() ? 258 */ 259#define TV_DELTA(a, b, delta) do { \ 260 int xxs; \ 261 \ 262 delta = (a).tv_usec - (b).tv_usec; \ 263 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 264 switch (xxs) { \ 265 case 2: \ 266 delta += 1000000; \ 267 /* FALLTHROUGH */ \ 268 case 1: \ 269 delta += 1000000; \ 270 break; \ 271 default: \ 272 delta += (1000000 * xxs); \ 273 } \ 274 } \ 275} while (/*CONSTCOND*/ 0) 276 277/* XXX: replace with timercmp(a, b, <) ? */ 278#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 279 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 280 281#ifdef UPCALL_TIMING 282#define UPCALL_MAX 50 283static u_long upcall_data[UPCALL_MAX + 1]; 284static void collate(); 285#endif /* UPCALL_TIMING */ 286 287static int get_sg_cnt __P((struct sioc_sg_req6 *)); 288static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 289static int ip6_mrouter_init __P((struct socket *, int, int)); 290static int add_m6if __P((struct mif6ctl *)); 291static int del_m6if __P((mifi_t *)); 292static int add_m6fc __P((struct mf6cctl *)); 293static int del_m6fc __P((struct mf6cctl *)); 294 295static struct callout expire_upcalls_ch; 296 297int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m); 298int X_ip6_mrouter_done(void); 299int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt); 300int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt); 301int X_mrt6_ioctl(int cmd, caddr_t data); 302 303/* 304 * Handle MRT setsockopt commands to modify the multicast routing tables. 305 */ 306int 307X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 308{ 309 int error = 0; 310 int optval; 311 struct mif6ctl mifc; 312 struct mf6cctl mfcc; 313 mifi_t mifi; 314 315 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 316 return (EACCES); 317 318 switch (sopt->sopt_name) { 319 case MRT6_INIT: 320#ifdef MRT6_OINIT 321 case MRT6_OINIT: 322#endif 323 error = sooptcopyin(sopt, &optval, sizeof(optval), 324 sizeof(optval)); 325 if (error) 326 break; 327 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 328 break; 329 case MRT6_DONE: 330 error = X_ip6_mrouter_done(); 331 break; 332 case MRT6_ADD_MIF: 333 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 334 if (error) 335 break; 336 error = add_m6if(&mifc); 337 break; 338 case MRT6_ADD_MFC: 339 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 340 if (error) 341 break; 342 error = add_m6fc(&mfcc); 343 break; 344 case MRT6_DEL_MFC: 345 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 346 if (error) 347 break; 348 error = del_m6fc(&mfcc); 349 break; 350 case MRT6_DEL_MIF: 351 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 352 if (error) 353 break; 354 error = del_m6if(&mifi); 355 break; 356 case MRT6_PIM: 357 error = sooptcopyin(sopt, &optval, sizeof(optval), 358 sizeof(optval)); 359 if (error) 360 break; 361 error = set_pim6(&optval); 362 break; 363 default: 364 error = EOPNOTSUPP; 365 break; 366 } 367 368 return (error); 369} 370 371/* 372 * Handle MRT getsockopt commands 373 */ 374int 375X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 376{ 377 int error = 0; 378 379 if (so != ip6_mrouter) 380 return (EACCES); 381 382 switch (sopt->sopt_name) { 383 case MRT6_PIM: 384 error = sooptcopyout(sopt, &pim6, sizeof(pim6)); 385 break; 386 } 387 return (error); 388} 389 390/* 391 * Handle ioctl commands to obtain information from the cache 392 */ 393int 394X_mrt6_ioctl(int cmd, caddr_t data) 395{ 396 switch (cmd) { 397 case SIOCGETSGCNT_IN6: 398 return (get_sg_cnt((struct sioc_sg_req6 *)data)); 399 case SIOCGETMIFCNT_IN6: 400 return (get_mif6_cnt((struct sioc_mif_req6 *)data)); 401 default: 402 return (EINVAL); 403 } 404} 405 406/* 407 * returns the packet, byte, rpf-failure count for the source group provided 408 */ 409static int 410get_sg_cnt(struct sioc_sg_req6 *req) 411{ 412 struct mf6c *rt; 413 int s; 414 415 s = splnet(); 416 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 417 splx(s); 418 if (rt != NULL) { 419 req->pktcnt = rt->mf6c_pkt_cnt; 420 req->bytecnt = rt->mf6c_byte_cnt; 421 req->wrong_if = rt->mf6c_wrong_if; 422 } else 423 return (ESRCH); 424#if 0 425 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 426#endif 427 428 return (0); 429} 430 431/* 432 * returns the input and output packet and byte counts on the mif provided 433 */ 434static int 435get_mif6_cnt(struct sioc_mif_req6 *req) 436{ 437 mifi_t mifi = req->mifi; 438 439 if (mifi >= nummifs) 440 return (EINVAL); 441 442 req->icount = mif6table[mifi].m6_pkt_in; 443 req->ocount = mif6table[mifi].m6_pkt_out; 444 req->ibytes = mif6table[mifi].m6_bytes_in; 445 req->obytes = mif6table[mifi].m6_bytes_out; 446 447 return (0); 448} 449 450static int 451set_pim6(int *i) 452{ 453 if ((*i != 1) && (*i != 0)) 454 return (EINVAL); 455 456 pim6 = *i; 457 458 return (0); 459} 460 461/* 462 * Enable multicast routing 463 */ 464static int 465ip6_mrouter_init(struct socket *so, int v, int cmd) 466{ 467#ifdef MRT6DEBUG 468 if (mrt6debug) 469 log(LOG_DEBUG, 470 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 471 so->so_type, so->so_proto->pr_protocol); 472#endif 473 474 if (so->so_type != SOCK_RAW || 475 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 476 return (EOPNOTSUPP); 477 478 if (v != 1) 479 return (ENOPROTOOPT); 480 481 if (ip6_mrouter != NULL) 482 return (EADDRINUSE); 483 484 ip6_mrouter = so; 485 ip6_mrouter_ver = cmd; 486 487 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 488 bzero((caddr_t)n6expire, sizeof(n6expire)); 489 490 pim6 = 0;/* used for stubbing out/in pim stuff */ 491 492 callout_init(&expire_upcalls_ch, 0); 493 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 494 expire_upcalls, NULL); 495 496#ifdef MRT6DEBUG 497 if (mrt6debug) 498 log(LOG_DEBUG, "ip6_mrouter_init\n"); 499#endif 500 501 return (0); 502} 503 504/* 505 * Disable multicast routing 506 */ 507int 508X_ip6_mrouter_done(void) 509{ 510 mifi_t mifi; 511 int i; 512 struct mf6c *rt; 513 struct rtdetq *rte; 514 int s; 515 516 s = splnet(); 517 518 /* 519 * For each phyint in use, disable promiscuous reception of all IPv6 520 * multicasts. 521 */ 522#ifdef INET 523#ifdef MROUTING 524 /* 525 * If there is still IPv4 multicast routing daemon, 526 * we remain interfaces to receive all muliticasted packets. 527 * XXX: there may be an interface in which the IPv4 multicast 528 * daemon is not interested... 529 */ 530 if (!ip_mrouter) 531#endif 532#endif 533 { 534 for (mifi = 0; mifi < nummifs; mifi++) { 535 if (mif6table[mifi].m6_ifp && 536 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 537 if_allmulti(mif6table[mifi].m6_ifp, 0); 538 } 539 } 540 } 541 bzero((caddr_t)mif6table, sizeof(mif6table)); 542 nummifs = 0; 543 544 pim6 = 0; /* used to stub out/in pim specific code */ 545 546 callout_stop(&expire_upcalls_ch); 547 548 /* 549 * Free all multicast forwarding cache entries. 550 */ 551 for (i = 0; i < MF6CTBLSIZ; i++) { 552 rt = mf6ctable[i]; 553 while (rt) { 554 struct mf6c *frt; 555 556 for (rte = rt->mf6c_stall; rte != NULL; ) { 557 struct rtdetq *n = rte->next; 558 559 m_free(rte->m); 560 free(rte, M_MRTABLE6); 561 rte = n; 562 } 563 frt = rt; 564 rt = rt->mf6c_next; 565 free(frt, M_MRTABLE6); 566 } 567 } 568 569 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 570 571 /* 572 * Reset register interface 573 */ 574 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 575 if_detach(multicast_register_if6); 576 if_free(multicast_register_if6); 577 reg_mif_num = (mifi_t)-1; 578 multicast_register_if6 = NULL; 579 } 580 581 ip6_mrouter = NULL; 582 ip6_mrouter_ver = 0; 583 584 splx(s); 585 586#ifdef MRT6DEBUG 587 if (mrt6debug) 588 log(LOG_DEBUG, "ip6_mrouter_done\n"); 589#endif 590 591 return (0); 592} 593 594static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 595 596/* 597 * Add a mif to the mif table 598 */ 599static int 600add_m6if(struct mif6ctl *mifcp) 601{ 602 struct mif6 *mifp; 603 struct ifnet *ifp; 604 int error, s; 605 606 if (mifcp->mif6c_mifi >= MAXMIFS) 607 return (EINVAL); 608 mifp = mif6table + mifcp->mif6c_mifi; 609 if (mifp->m6_ifp) 610 return (EADDRINUSE); /* XXX: is it appropriate? */ 611 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 612 return (ENXIO); 613 ifp = ifnet_byindex(mifcp->mif6c_pifi); 614 615 if (mifcp->mif6c_flags & MIFF_REGISTER) { 616 if (reg_mif_num == (mifi_t)-1) { 617 ifp = if_alloc(IFT_OTHER); 618 619 if_initname(ifp, "register_mif", 0); 620 ifp->if_flags |= IFF_LOOPBACK; 621 if_attach(ifp); 622 multicast_register_if6 = ifp; 623 reg_mif_num = mifcp->mif6c_mifi; 624 /* 625 * it is impossible to guess the ifindex of the 626 * register interface. So mif6c_pifi is automatically 627 * calculated. 628 */ 629 mifcp->mif6c_pifi = ifp->if_index; 630 } else { 631 ifp = multicast_register_if6; 632 } 633 634 } /* if REGISTER */ 635 else { 636 /* Make sure the interface supports multicast */ 637 if ((ifp->if_flags & IFF_MULTICAST) == 0) 638 return (EOPNOTSUPP); 639 640 s = splnet(); 641 error = if_allmulti(ifp, 1); 642 splx(s); 643 if (error) 644 return (error); 645 } 646 647 s = splnet(); 648 mifp->m6_flags = mifcp->mif6c_flags; 649 mifp->m6_ifp = ifp; 650 651 /* initialize per mif pkt counters */ 652 mifp->m6_pkt_in = 0; 653 mifp->m6_pkt_out = 0; 654 mifp->m6_bytes_in = 0; 655 mifp->m6_bytes_out = 0; 656 splx(s); 657 658 /* Adjust nummifs up if the mifi is higher than nummifs */ 659 if (nummifs <= mifcp->mif6c_mifi) 660 nummifs = mifcp->mif6c_mifi + 1; 661 662#ifdef MRT6DEBUG 663 if (mrt6debug) 664 log(LOG_DEBUG, 665 "add_mif #%d, phyint %s\n", 666 mifcp->mif6c_mifi, 667 ifp->if_xname); 668#endif 669 670 return (0); 671} 672 673/* 674 * Delete a mif from the mif table 675 */ 676static int 677del_m6if(mifi_t *mifip) 678{ 679 struct mif6 *mifp = mif6table + *mifip; 680 mifi_t mifi; 681 struct ifnet *ifp; 682 int s; 683 684 if (*mifip >= nummifs) 685 return (EINVAL); 686 if (mifp->m6_ifp == NULL) 687 return (EINVAL); 688 689 s = splnet(); 690 691 if (!(mifp->m6_flags & MIFF_REGISTER)) { 692 /* 693 * XXX: what if there is yet IPv4 multicast daemon 694 * using the interface? 695 */ 696 ifp = mifp->m6_ifp; 697 698 if_allmulti(ifp, 0); 699 } else { 700 if (reg_mif_num != (mifi_t)-1 && 701 multicast_register_if6 != NULL) { 702 if_detach(multicast_register_if6); 703 if_free(multicast_register_if6); 704 reg_mif_num = (mifi_t)-1; 705 multicast_register_if6 = NULL; 706 } 707 } 708 709 bzero((caddr_t)mifp, sizeof(*mifp)); 710 711 /* Adjust nummifs down */ 712 for (mifi = nummifs; mifi > 0; mifi--) 713 if (mif6table[mifi - 1].m6_ifp) 714 break; 715 nummifs = mifi; 716 717 splx(s); 718 719#ifdef MRT6DEBUG 720 if (mrt6debug) 721 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 722#endif 723 724 return (0); 725} 726 727/* 728 * Add an mfc entry 729 */ 730static int 731add_m6fc(struct mf6cctl *mfccp) 732{ 733 struct mf6c *rt; 734 u_long hash; 735 struct rtdetq *rte; 736 u_short nstl; 737 int s; 738 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 739 740 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 741 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 742 743 /* If an entry already exists, just update the fields */ 744 if (rt) { 745#ifdef MRT6DEBUG 746 if (mrt6debug & DEBUG_MFC) { 747 log(LOG_DEBUG, 748 "add_m6fc no upcall h %d o %s g %s p %x\n", 749 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 750 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 751 mfccp->mf6cc_parent); 752 } 753#endif 754 755 s = splnet(); 756 rt->mf6c_parent = mfccp->mf6cc_parent; 757 rt->mf6c_ifset = mfccp->mf6cc_ifset; 758 splx(s); 759 return (0); 760 } 761 762 /* 763 * Find the entry for which the upcall was made and update 764 */ 765 s = splnet(); 766 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 767 mfccp->mf6cc_mcastgrp.sin6_addr); 768 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 769 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 770 &mfccp->mf6cc_origin.sin6_addr) && 771 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 772 &mfccp->mf6cc_mcastgrp.sin6_addr) && 773 (rt->mf6c_stall != NULL)) { 774 775 if (nstl++) 776 log(LOG_ERR, 777 "add_m6fc: %s o %s g %s p %x dbx %p\n", 778 "multiple kernel entries", 779 ip6_sprintf(ip6bufo, 780 &mfccp->mf6cc_origin.sin6_addr), 781 ip6_sprintf(ip6bufg, 782 &mfccp->mf6cc_mcastgrp.sin6_addr), 783 mfccp->mf6cc_parent, rt->mf6c_stall); 784 785#ifdef MRT6DEBUG 786 if (mrt6debug & DEBUG_MFC) 787 log(LOG_DEBUG, 788 "add_m6fc o %s g %s p %x dbg %x\n", 789 ip6_sprintf(ip6bufo, 790 &mfccp->mf6cc_origin.sin6_addr), 791 ip6_sprintf(ip6bufg, 792 &mfccp->mf6cc_mcastgrp.sin6_addr), 793 mfccp->mf6cc_parent, rt->mf6c_stall); 794#endif 795 796 rt->mf6c_origin = mfccp->mf6cc_origin; 797 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 798 rt->mf6c_parent = mfccp->mf6cc_parent; 799 rt->mf6c_ifset = mfccp->mf6cc_ifset; 800 /* initialize pkt counters per src-grp */ 801 rt->mf6c_pkt_cnt = 0; 802 rt->mf6c_byte_cnt = 0; 803 rt->mf6c_wrong_if = 0; 804 805 rt->mf6c_expire = 0; /* Don't clean this guy up */ 806 n6expire[hash]--; 807 808 /* free packets Qed at the end of this entry */ 809 for (rte = rt->mf6c_stall; rte != NULL; ) { 810 struct rtdetq *n = rte->next; 811 ip6_mdq(rte->m, rte->ifp, rt); 812 m_freem(rte->m); 813#ifdef UPCALL_TIMING 814 collate(&(rte->t)); 815#endif /* UPCALL_TIMING */ 816 free(rte, M_MRTABLE6); 817 rte = n; 818 } 819 rt->mf6c_stall = NULL; 820 } 821 } 822 823 /* 824 * It is possible that an entry is being inserted without an upcall 825 */ 826 if (nstl == 0) { 827#ifdef MRT6DEBUG 828 if (mrt6debug & DEBUG_MFC) 829 log(LOG_DEBUG, 830 "add_mfc no upcall h %d o %s g %s p %x\n", 831 hash, 832 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 833 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 834 mfccp->mf6cc_parent); 835#endif 836 837 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 838 839 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 840 &mfccp->mf6cc_origin.sin6_addr)&& 841 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 842 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 843 844 rt->mf6c_origin = mfccp->mf6cc_origin; 845 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 846 rt->mf6c_parent = mfccp->mf6cc_parent; 847 rt->mf6c_ifset = mfccp->mf6cc_ifset; 848 /* initialize pkt counters per src-grp */ 849 rt->mf6c_pkt_cnt = 0; 850 rt->mf6c_byte_cnt = 0; 851 rt->mf6c_wrong_if = 0; 852 853 if (rt->mf6c_expire) 854 n6expire[hash]--; 855 rt->mf6c_expire = 0; 856 } 857 } 858 if (rt == NULL) { 859 /* no upcall, so make a new entry */ 860 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 861 M_NOWAIT); 862 if (rt == NULL) { 863 splx(s); 864 return (ENOBUFS); 865 } 866 867 /* insert new entry at head of hash chain */ 868 rt->mf6c_origin = mfccp->mf6cc_origin; 869 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 870 rt->mf6c_parent = mfccp->mf6cc_parent; 871 rt->mf6c_ifset = mfccp->mf6cc_ifset; 872 /* initialize pkt counters per src-grp */ 873 rt->mf6c_pkt_cnt = 0; 874 rt->mf6c_byte_cnt = 0; 875 rt->mf6c_wrong_if = 0; 876 rt->mf6c_expire = 0; 877 rt->mf6c_stall = NULL; 878 879 /* link into table */ 880 rt->mf6c_next = mf6ctable[hash]; 881 mf6ctable[hash] = rt; 882 } 883 } 884 splx(s); 885 return (0); 886} 887 888#ifdef UPCALL_TIMING 889/* 890 * collect delay statistics on the upcalls 891 */ 892static void 893collate(struct timeval *t) 894{ 895 u_long d; 896 struct timeval tp; 897 u_long delta; 898 899 GET_TIME(tp); 900 901 if (TV_LT(*t, tp)) 902 { 903 TV_DELTA(tp, *t, delta); 904 905 d = delta >> 10; 906 if (d > UPCALL_MAX) 907 d = UPCALL_MAX; 908 909 ++upcall_data[d]; 910 } 911} 912#endif /* UPCALL_TIMING */ 913 914/* 915 * Delete an mfc entry 916 */ 917static int 918del_m6fc(struct mf6cctl *mfccp) 919{ 920 struct sockaddr_in6 origin; 921 struct sockaddr_in6 mcastgrp; 922 struct mf6c *rt; 923 struct mf6c **nptr; 924 u_long hash; 925 int s; 926 927 origin = mfccp->mf6cc_origin; 928 mcastgrp = mfccp->mf6cc_mcastgrp; 929 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 930 931#ifdef MRT6DEBUG 932 if (mrt6debug & DEBUG_MFC) { 933 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 934 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 935 ip6_sprintf(ip6bufo, &origin.sin6_addr), 936 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 937 } 938#endif 939 940 s = splnet(); 941 942 nptr = &mf6ctable[hash]; 943 while ((rt = *nptr) != NULL) { 944 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 945 &rt->mf6c_origin.sin6_addr) && 946 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 947 &rt->mf6c_mcastgrp.sin6_addr) && 948 rt->mf6c_stall == NULL) 949 break; 950 951 nptr = &rt->mf6c_next; 952 } 953 if (rt == NULL) { 954 splx(s); 955 return (EADDRNOTAVAIL); 956 } 957 958 *nptr = rt->mf6c_next; 959 free(rt, M_MRTABLE6); 960 961 splx(s); 962 963 return (0); 964} 965 966static int 967socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 968{ 969 970 if (s) { 971 if (sbappendaddr(&s->so_rcv, 972 (struct sockaddr *)src, 973 mm, (struct mbuf *)0) != 0) { 974 sorwakeup(s); 975 return (0); 976 } 977 } 978 m_freem(mm); 979 return (-1); 980} 981 982/* 983 * IPv6 multicast forwarding function. This function assumes that the packet 984 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 985 * pointed to by "ifp", and the packet is to be relayed to other networks 986 * that have members of the packet's destination IPv6 multicast group. 987 * 988 * The packet is returned unscathed to the caller, unless it is 989 * erroneous, in which case a non-zero return value tells the caller to 990 * discard it. 991 * 992 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 993 * this function is called in the originating context (i.e., not when 994 * forwarding a packet from other node). ip6_output(), which is currently the 995 * only function that calls this function is called in the originating context, 996 * explicitly ensures this condition. It is caller's responsibility to ensure 997 * that if this function is called from somewhere else in the originating 998 * context in the future. 999 */ 1000int 1001X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1002{ 1003 struct mf6c *rt; 1004 struct mif6 *mifp; 1005 struct mbuf *mm; 1006 int s; 1007 mifi_t mifi; 1008 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1009 1010#ifdef MRT6DEBUG 1011 if (mrt6debug & DEBUG_FORWARD) 1012 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1013 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1014 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1015 ifp->if_index); 1016#endif 1017 1018 /* 1019 * Don't forward a packet with Hop limit of zero or one, 1020 * or a packet destined to a local-only group. 1021 */ 1022 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1023 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1024 return (0); 1025 ip6->ip6_hlim--; 1026 1027 /* 1028 * Source address check: do not forward packets with unspecified 1029 * source. It was discussed in July 2000, on ipngwg mailing list. 1030 * This is rather more serious than unicast cases, because some 1031 * MLD packets can be sent with the unspecified source address 1032 * (although such packets must normally set 1 to the hop limit field). 1033 */ 1034 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1035 ip6stat.ip6s_cantforward++; 1036 if (ip6_log_time + ip6_log_interval < time_second) { 1037 ip6_log_time = time_second; 1038 log(LOG_DEBUG, 1039 "cannot forward " 1040 "from %s to %s nxt %d received on %s\n", 1041 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1042 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1043 ip6->ip6_nxt, 1044 if_name(m->m_pkthdr.rcvif)); 1045 } 1046 return (0); 1047 } 1048 1049 /* 1050 * Determine forwarding mifs from the forwarding cache table 1051 */ 1052 s = splnet(); 1053 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1054 1055 /* Entry exists, so forward if necessary */ 1056 if (rt) { 1057 splx(s); 1058 return (ip6_mdq(m, ifp, rt)); 1059 } else { 1060 /* 1061 * If we don't have a route for packet's origin, 1062 * Make a copy of the packet & 1063 * send message to routing daemon 1064 */ 1065 1066 struct mbuf *mb0; 1067 struct rtdetq *rte; 1068 u_long hash; 1069/* int i, npkts;*/ 1070#ifdef UPCALL_TIMING 1071 struct timeval tp; 1072 1073 GET_TIME(tp); 1074#endif /* UPCALL_TIMING */ 1075 1076 mrt6stat.mrt6s_no_route++; 1077#ifdef MRT6DEBUG 1078 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1079 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1080 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1081 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1082#endif 1083 1084 /* 1085 * Allocate mbufs early so that we don't do extra work if we 1086 * are just going to fail anyway. 1087 */ 1088 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1089 M_NOWAIT); 1090 if (rte == NULL) { 1091 splx(s); 1092 return (ENOBUFS); 1093 } 1094 mb0 = m_copy(m, 0, M_COPYALL); 1095 /* 1096 * Pullup packet header if needed before storing it, 1097 * as other references may modify it in the meantime. 1098 */ 1099 if (mb0 && 1100 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1101 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1102 if (mb0 == NULL) { 1103 free(rte, M_MRTABLE6); 1104 splx(s); 1105 return (ENOBUFS); 1106 } 1107 1108 /* is there an upcall waiting for this packet? */ 1109 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1110 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1111 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1112 &rt->mf6c_origin.sin6_addr) && 1113 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1114 &rt->mf6c_mcastgrp.sin6_addr) && 1115 (rt->mf6c_stall != NULL)) 1116 break; 1117 } 1118 1119 if (rt == NULL) { 1120 struct mrt6msg *im; 1121#ifdef MRT6_OINIT 1122 struct omrt6msg *oim; 1123#endif 1124 1125 /* no upcall, so make a new entry */ 1126 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1127 M_NOWAIT); 1128 if (rt == NULL) { 1129 free(rte, M_MRTABLE6); 1130 m_freem(mb0); 1131 splx(s); 1132 return (ENOBUFS); 1133 } 1134 /* 1135 * Make a copy of the header to send to the user 1136 * level process 1137 */ 1138 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1139 1140 if (mm == NULL) { 1141 free(rte, M_MRTABLE6); 1142 m_freem(mb0); 1143 free(rt, M_MRTABLE6); 1144 splx(s); 1145 return (ENOBUFS); 1146 } 1147 1148 /* 1149 * Send message to routing daemon 1150 */ 1151 sin6.sin6_addr = ip6->ip6_src; 1152 1153 im = NULL; 1154#ifdef MRT6_OINIT 1155 oim = NULL; 1156#endif 1157 switch (ip6_mrouter_ver) { 1158#ifdef MRT6_OINIT 1159 case MRT6_OINIT: 1160 oim = mtod(mm, struct omrt6msg *); 1161 oim->im6_msgtype = MRT6MSG_NOCACHE; 1162 oim->im6_mbz = 0; 1163 break; 1164#endif 1165 case MRT6_INIT: 1166 im = mtod(mm, struct mrt6msg *); 1167 im->im6_msgtype = MRT6MSG_NOCACHE; 1168 im->im6_mbz = 0; 1169 break; 1170 default: 1171 free(rte, M_MRTABLE6); 1172 m_freem(mb0); 1173 free(rt, M_MRTABLE6); 1174 splx(s); 1175 return (EINVAL); 1176 } 1177 1178#ifdef MRT6DEBUG 1179 if (mrt6debug & DEBUG_FORWARD) 1180 log(LOG_DEBUG, 1181 "getting the iif info in the kernel\n"); 1182#endif 1183 1184 for (mifp = mif6table, mifi = 0; 1185 mifi < nummifs && mifp->m6_ifp != ifp; 1186 mifp++, mifi++) 1187 ; 1188 1189 switch (ip6_mrouter_ver) { 1190#ifdef MRT6_OINIT 1191 case MRT6_OINIT: 1192 oim->im6_mif = mifi; 1193 break; 1194#endif 1195 case MRT6_INIT: 1196 im->im6_mif = mifi; 1197 break; 1198 } 1199 1200 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1201 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1202 "socket queue full\n"); 1203 mrt6stat.mrt6s_upq_sockfull++; 1204 free(rte, M_MRTABLE6); 1205 m_freem(mb0); 1206 free(rt, M_MRTABLE6); 1207 splx(s); 1208 return (ENOBUFS); 1209 } 1210 1211 mrt6stat.mrt6s_upcalls++; 1212 1213 /* insert new entry at head of hash chain */ 1214 bzero(rt, sizeof(*rt)); 1215 rt->mf6c_origin.sin6_family = AF_INET6; 1216 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1217 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1218 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1219 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1220 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1221 rt->mf6c_expire = UPCALL_EXPIRE; 1222 n6expire[hash]++; 1223 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1224 1225 /* link into table */ 1226 rt->mf6c_next = mf6ctable[hash]; 1227 mf6ctable[hash] = rt; 1228 /* Add this entry to the end of the queue */ 1229 rt->mf6c_stall = rte; 1230 } else { 1231 /* determine if q has overflowed */ 1232 struct rtdetq **p; 1233 int npkts = 0; 1234 1235 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1236 if (++npkts > MAX_UPQ6) { 1237 mrt6stat.mrt6s_upq_ovflw++; 1238 free(rte, M_MRTABLE6); 1239 m_freem(mb0); 1240 splx(s); 1241 return (0); 1242 } 1243 1244 /* Add this entry to the end of the queue */ 1245 *p = rte; 1246 } 1247 1248 rte->next = NULL; 1249 rte->m = mb0; 1250 rte->ifp = ifp; 1251#ifdef UPCALL_TIMING 1252 rte->t = tp; 1253#endif /* UPCALL_TIMING */ 1254 1255 splx(s); 1256 1257 return (0); 1258 } 1259} 1260 1261/* 1262 * Clean up cache entries if upcalls are not serviced 1263 * Call from the Slow Timeout mechanism, every half second. 1264 */ 1265static void 1266expire_upcalls(void *unused) 1267{ 1268 struct rtdetq *rte; 1269 struct mf6c *mfc, **nptr; 1270 int i; 1271 int s; 1272 1273 s = splnet(); 1274 for (i = 0; i < MF6CTBLSIZ; i++) { 1275 if (n6expire[i] == 0) 1276 continue; 1277 nptr = &mf6ctable[i]; 1278 while ((mfc = *nptr) != NULL) { 1279 rte = mfc->mf6c_stall; 1280 /* 1281 * Skip real cache entries 1282 * Make sure it wasn't marked to not expire (shouldn't happen) 1283 * If it expires now 1284 */ 1285 if (rte != NULL && 1286 mfc->mf6c_expire != 0 && 1287 --mfc->mf6c_expire == 0) { 1288#ifdef MRT6DEBUG 1289 if (mrt6debug & DEBUG_EXPIRE) { 1290 char ip6bufo[INET6_ADDRSTRLEN]; 1291 char ip6bufg[INET6_ADDRSTRLEN]; 1292 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1293 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1294 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1295 } 1296#endif 1297 /* 1298 * drop all the packets 1299 * free the mbuf with the pkt, if, timing info 1300 */ 1301 do { 1302 struct rtdetq *n = rte->next; 1303 m_freem(rte->m); 1304 free(rte, M_MRTABLE6); 1305 rte = n; 1306 } while (rte != NULL); 1307 mrt6stat.mrt6s_cache_cleanups++; 1308 n6expire[i]--; 1309 1310 *nptr = mfc->mf6c_next; 1311 free(mfc, M_MRTABLE6); 1312 } else { 1313 nptr = &mfc->mf6c_next; 1314 } 1315 } 1316 } 1317 splx(s); 1318 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1319 expire_upcalls, NULL); 1320} 1321 1322/* 1323 * Packet forwarding routine once entry in the cache is made 1324 */ 1325static int 1326ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1327{ 1328 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1329 mifi_t mifi, iif; 1330 struct mif6 *mifp; 1331 int plen = m->m_pkthdr.len; 1332 struct in6_addr src0, dst0; /* copies for local work */ 1333 u_int32_t iszone, idzone, oszone, odzone; 1334 int error = 0; 1335 1336/* 1337 * Macro to send packet on mif. Since RSVP packets don't get counted on 1338 * input, they shouldn't get counted on output, so statistics keeping is 1339 * separate. 1340 */ 1341 1342#define MC6_SEND(ip6, mifp, m) do { \ 1343 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1344 register_send((ip6), (mifp), (m)); \ 1345 else \ 1346 phyint_send((ip6), (mifp), (m)); \ 1347} while (/*CONSTCOND*/ 0) 1348 1349 /* 1350 * Don't forward if it didn't arrive from the parent mif 1351 * for its origin. 1352 */ 1353 mifi = rt->mf6c_parent; 1354 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1355 /* came in the wrong interface */ 1356#ifdef MRT6DEBUG 1357 if (mrt6debug & DEBUG_FORWARD) 1358 log(LOG_DEBUG, 1359 "wrong if: ifid %d mifi %d mififid %x\n", 1360 ifp->if_index, mifi, 1361 mif6table[mifi].m6_ifp->if_index); 1362#endif 1363 mrt6stat.mrt6s_wrong_if++; 1364 rt->mf6c_wrong_if++; 1365 /* 1366 * If we are doing PIM processing, and we are forwarding 1367 * packets on this interface, send a message to the 1368 * routing daemon. 1369 */ 1370 /* have to make sure this is a valid mif */ 1371 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1372 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1373 /* 1374 * Check the M_LOOP flag to avoid an 1375 * unnecessary PIM assert. 1376 * XXX: M_LOOP is an ad-hoc hack... 1377 */ 1378 static struct sockaddr_in6 sin6 = 1379 { sizeof(sin6), AF_INET6 }; 1380 1381 struct mbuf *mm; 1382 struct mrt6msg *im; 1383#ifdef MRT6_OINIT 1384 struct omrt6msg *oim; 1385#endif 1386 1387 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1388 if (mm && 1389 (M_HASCL(mm) || 1390 mm->m_len < sizeof(struct ip6_hdr))) 1391 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1392 if (mm == NULL) 1393 return (ENOBUFS); 1394 1395#ifdef MRT6_OINIT 1396 oim = NULL; 1397#endif 1398 im = NULL; 1399 switch (ip6_mrouter_ver) { 1400#ifdef MRT6_OINIT 1401 case MRT6_OINIT: 1402 oim = mtod(mm, struct omrt6msg *); 1403 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1404 oim->im6_mbz = 0; 1405 break; 1406#endif 1407 case MRT6_INIT: 1408 im = mtod(mm, struct mrt6msg *); 1409 im->im6_msgtype = MRT6MSG_WRONGMIF; 1410 im->im6_mbz = 0; 1411 break; 1412 default: 1413 m_freem(mm); 1414 return (EINVAL); 1415 } 1416 1417 for (mifp = mif6table, iif = 0; 1418 iif < nummifs && mifp && 1419 mifp->m6_ifp != ifp; 1420 mifp++, iif++) 1421 ; 1422 1423 switch (ip6_mrouter_ver) { 1424#ifdef MRT6_OINIT 1425 case MRT6_OINIT: 1426 oim->im6_mif = iif; 1427 sin6.sin6_addr = oim->im6_src; 1428 break; 1429#endif 1430 case MRT6_INIT: 1431 im->im6_mif = iif; 1432 sin6.sin6_addr = im->im6_src; 1433 break; 1434 } 1435 1436 mrt6stat.mrt6s_upcalls++; 1437 1438 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1439#ifdef MRT6DEBUG 1440 if (mrt6debug) 1441 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1442#endif 1443 ++mrt6stat.mrt6s_upq_sockfull; 1444 return (ENOBUFS); 1445 } /* if socket Q full */ 1446 } /* if PIM */ 1447 return (0); 1448 } /* if wrong iif */ 1449 1450 /* If I sourced this packet, it counts as output, else it was input. */ 1451 if (m->m_pkthdr.rcvif == NULL) { 1452 /* XXX: is rcvif really NULL when output?? */ 1453 mif6table[mifi].m6_pkt_out++; 1454 mif6table[mifi].m6_bytes_out += plen; 1455 } else { 1456 mif6table[mifi].m6_pkt_in++; 1457 mif6table[mifi].m6_bytes_in += plen; 1458 } 1459 rt->mf6c_pkt_cnt++; 1460 rt->mf6c_byte_cnt += plen; 1461 1462 /* 1463 * For each mif, forward a copy of the packet if there are group 1464 * members downstream on the interface. 1465 */ 1466 src0 = ip6->ip6_src; 1467 dst0 = ip6->ip6_dst; 1468 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1469 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1470 ip6stat.ip6s_badscope++; 1471 return (error); 1472 } 1473 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1474 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1475 /* 1476 * check if the outgoing packet is going to break 1477 * a scope boundary. 1478 * XXX For packets through PIM register tunnel 1479 * interface, we believe a routing daemon. 1480 */ 1481 if (!(mif6table[rt->mf6c_parent].m6_flags & 1482 MIFF_REGISTER) && 1483 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1484 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1485 &oszone) || 1486 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1487 &odzone) || 1488 iszone != oszone || 1489 idzone != odzone) { 1490 ip6stat.ip6s_badscope++; 1491 continue; 1492 } 1493 } 1494 1495 mifp->m6_pkt_out++; 1496 mifp->m6_bytes_out += plen; 1497 MC6_SEND(ip6, mifp, m); 1498 } 1499 } 1500 return (0); 1501} 1502 1503static void 1504phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1505{ 1506 struct mbuf *mb_copy; 1507 struct ifnet *ifp = mifp->m6_ifp; 1508 int error = 0; 1509 int s = splnet(); /* needs to protect static "ro" below. */ 1510 static struct route_in6 ro; 1511 struct in6_multi *in6m; 1512 struct sockaddr_in6 *dst6; 1513 u_long linkmtu; 1514 1515 /* 1516 * Make a new reference to the packet; make sure that 1517 * the IPv6 header is actually copied, not just referenced, 1518 * so that ip6_output() only scribbles on the copy. 1519 */ 1520 mb_copy = m_copy(m, 0, M_COPYALL); 1521 if (mb_copy && 1522 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1523 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1524 if (mb_copy == NULL) { 1525 splx(s); 1526 return; 1527 } 1528 /* set MCAST flag to the outgoing packet */ 1529 mb_copy->m_flags |= M_MCAST; 1530 1531 /* 1532 * If we sourced the packet, call ip6_output since we may devide 1533 * the packet into fragments when the packet is too big for the 1534 * outgoing interface. 1535 * Otherwise, we can simply send the packet to the interface 1536 * sending queue. 1537 */ 1538 if (m->m_pkthdr.rcvif == NULL) { 1539 struct ip6_moptions im6o; 1540 1541 im6o.im6o_multicast_ifp = ifp; 1542 /* XXX: ip6_output will override ip6->ip6_hlim */ 1543 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1544 im6o.im6o_multicast_loop = 1; 1545 error = ip6_output(mb_copy, NULL, &ro, 1546 IPV6_FORWARDING, &im6o, NULL, NULL); 1547 1548#ifdef MRT6DEBUG 1549 if (mrt6debug & DEBUG_XMIT) 1550 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1551 mifp - mif6table, error); 1552#endif 1553 splx(s); 1554 return; 1555 } 1556 1557 /* 1558 * If we belong to the destination multicast group 1559 * on the outgoing interface, loop back a copy. 1560 */ 1561 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 1562 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1563 if (in6m != NULL) { 1564 dst6->sin6_len = sizeof(struct sockaddr_in6); 1565 dst6->sin6_family = AF_INET6; 1566 dst6->sin6_addr = ip6->ip6_dst; 1567 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); 1568 } 1569 /* 1570 * Put the packet into the sending queue of the outgoing interface 1571 * if it would fit in the MTU of the interface. 1572 */ 1573 linkmtu = IN6_LINKMTU(ifp); 1574 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1575 dst6->sin6_len = sizeof(struct sockaddr_in6); 1576 dst6->sin6_family = AF_INET6; 1577 dst6->sin6_addr = ip6->ip6_dst; 1578 /* 1579 * We just call if_output instead of nd6_output here, since 1580 * we need no ND for a multicast forwarded packet...right? 1581 */ 1582 error = (*ifp->if_output)(ifp, mb_copy, 1583 (struct sockaddr *)&ro.ro_dst, NULL); 1584#ifdef MRT6DEBUG 1585 if (mrt6debug & DEBUG_XMIT) 1586 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1587 mifp - mif6table, error); 1588#endif 1589 } else { 1590 /* 1591 * pMTU discovery is intentionally disabled by default, since 1592 * various router may notify pMTU in multicast, which can be 1593 * a DDoS to a router 1594 */ 1595 if (ip6_mcast_pmtu) 1596 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1597 else { 1598#ifdef MRT6DEBUG 1599 if (mrt6debug & DEBUG_XMIT) { 1600 char ip6bufs[INET6_ADDRSTRLEN]; 1601 char ip6bufd[INET6_ADDRSTRLEN]; 1602 log(LOG_DEBUG, 1603 "phyint_send: packet too big on %s o %s " 1604 "g %s size %d(discarded)\n", 1605 if_name(ifp), 1606 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1607 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1608 mb_copy->m_pkthdr.len); 1609 } 1610#endif /* MRT6DEBUG */ 1611 m_freem(mb_copy); /* simply discard the packet */ 1612 } 1613 } 1614 1615 splx(s); 1616} 1617 1618static int 1619register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1620{ 1621 struct mbuf *mm; 1622 int i, len = m->m_pkthdr.len; 1623 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1624 struct mrt6msg *im6; 1625 1626#ifdef MRT6DEBUG 1627 if (mrt6debug) { 1628 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1629 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1630 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1631 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1632 } 1633#endif 1634 ++pim6stat.pim6s_snd_registers; 1635 1636 /* Make a copy of the packet to send to the user level process */ 1637 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1638 if (mm == NULL) 1639 return (ENOBUFS); 1640 mm->m_pkthdr.rcvif = NULL; 1641 mm->m_data += max_linkhdr; 1642 mm->m_len = sizeof(struct ip6_hdr); 1643 1644 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1645 m_freem(mm); 1646 return (ENOBUFS); 1647 } 1648 i = MHLEN - M_LEADINGSPACE(mm); 1649 if (i > len) 1650 i = len; 1651 mm = m_pullup(mm, i); 1652 if (mm == NULL) 1653 return (ENOBUFS); 1654/* TODO: check it! */ 1655 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1656 1657 /* 1658 * Send message to routing daemon 1659 */ 1660 sin6.sin6_addr = ip6->ip6_src; 1661 1662 im6 = mtod(mm, struct mrt6msg *); 1663 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1664 im6->im6_mbz = 0; 1665 1666 im6->im6_mif = mif - mif6table; 1667 1668 /* iif info is not given for reg. encap.n */ 1669 mrt6stat.mrt6s_upcalls++; 1670 1671 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1672#ifdef MRT6DEBUG 1673 if (mrt6debug) 1674 log(LOG_WARNING, 1675 "register_send: ip6_mrouter socket queue full\n"); 1676#endif 1677 ++mrt6stat.mrt6s_upq_sockfull; 1678 return (ENOBUFS); 1679 } 1680 return (0); 1681} 1682 1683/* 1684 * PIM sparse mode hook 1685 * Receives the pim control messages, and passes them up to the listening 1686 * socket, using rip6_input. 1687 * The only message processed is the REGISTER pim message; the pim header 1688 * is stripped off, and the inner packet is passed to register_mforward. 1689 */ 1690int 1691pim6_input(struct mbuf **mp, int *offp, int proto) 1692{ 1693 struct pim *pim; /* pointer to a pim struct */ 1694 struct ip6_hdr *ip6; 1695 int pimlen; 1696 struct mbuf *m = *mp; 1697 int minlen; 1698 int off = *offp; 1699 1700 ++pim6stat.pim6s_rcv_total; 1701 1702 ip6 = mtod(m, struct ip6_hdr *); 1703 pimlen = m->m_pkthdr.len - *offp; 1704 1705 /* 1706 * Validate lengths 1707 */ 1708 if (pimlen < PIM_MINLEN) { 1709 ++pim6stat.pim6s_rcv_tooshort; 1710#ifdef MRT6DEBUG 1711 if (mrt6debug & DEBUG_PIM) 1712 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1713#endif 1714 m_freem(m); 1715 return (IPPROTO_DONE); 1716 } 1717 1718 /* 1719 * if the packet is at least as big as a REGISTER, go ahead 1720 * and grab the PIM REGISTER header size, to avoid another 1721 * possible m_pullup() later. 1722 * 1723 * PIM_MINLEN == pimhdr + u_int32 == 8 1724 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1725 */ 1726 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1727 1728 /* 1729 * Make sure that the IP6 and PIM headers in contiguous memory, and 1730 * possibly the PIM REGISTER header 1731 */ 1732#ifndef PULLDOWN_TEST 1733 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1734 /* adjust pointer */ 1735 ip6 = mtod(m, struct ip6_hdr *); 1736 1737 /* adjust mbuf to point to the PIM header */ 1738 pim = (struct pim *)((caddr_t)ip6 + off); 1739#else 1740 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1741 if (pim == NULL) { 1742 pim6stat.pim6s_rcv_tooshort++; 1743 return (IPPROTO_DONE); 1744 } 1745#endif 1746 1747#define PIM6_CHECKSUM 1748#ifdef PIM6_CHECKSUM 1749 { 1750 int cksumlen; 1751 1752 /* 1753 * Validate checksum. 1754 * If PIM REGISTER, exclude the data packet 1755 */ 1756 if (pim->pim_type == PIM_REGISTER) 1757 cksumlen = PIM_MINLEN; 1758 else 1759 cksumlen = pimlen; 1760 1761 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1762 ++pim6stat.pim6s_rcv_badsum; 1763#ifdef MRT6DEBUG 1764 if (mrt6debug & DEBUG_PIM) 1765 log(LOG_DEBUG, 1766 "pim6_input: invalid checksum\n"); 1767#endif 1768 m_freem(m); 1769 return (IPPROTO_DONE); 1770 } 1771 } 1772#endif /* PIM_CHECKSUM */ 1773 1774 /* PIM version check */ 1775 if (pim->pim_ver != PIM_VERSION) { 1776 ++pim6stat.pim6s_rcv_badversion; 1777#ifdef MRT6DEBUG 1778 log(LOG_ERR, 1779 "pim6_input: incorrect version %d, expecting %d\n", 1780 pim->pim_ver, PIM_VERSION); 1781#endif 1782 m_freem(m); 1783 return (IPPROTO_DONE); 1784 } 1785 1786 if (pim->pim_type == PIM_REGISTER) { 1787 /* 1788 * since this is a REGISTER, we'll make a copy of the register 1789 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1790 * routing daemon. 1791 */ 1792 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1793 1794 struct mbuf *mcp; 1795 struct ip6_hdr *eip6; 1796 u_int32_t *reghdr; 1797 int rc; 1798#ifdef MRT6DEBUG 1799 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1800#endif 1801 1802 ++pim6stat.pim6s_rcv_registers; 1803 1804 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1805#ifdef MRT6DEBUG 1806 if (mrt6debug & DEBUG_PIM) 1807 log(LOG_DEBUG, 1808 "pim6_input: register mif not set: %d\n", 1809 reg_mif_num); 1810#endif 1811 m_freem(m); 1812 return (IPPROTO_DONE); 1813 } 1814 1815 reghdr = (u_int32_t *)(pim + 1); 1816 1817 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1818 goto pim6_input_to_daemon; 1819 1820 /* 1821 * Validate length 1822 */ 1823 if (pimlen < PIM6_REG_MINLEN) { 1824 ++pim6stat.pim6s_rcv_tooshort; 1825 ++pim6stat.pim6s_rcv_badregisters; 1826#ifdef MRT6DEBUG 1827 log(LOG_ERR, 1828 "pim6_input: register packet size too " 1829 "small %d from %s\n", 1830 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1831#endif 1832 m_freem(m); 1833 return (IPPROTO_DONE); 1834 } 1835 1836 eip6 = (struct ip6_hdr *) (reghdr + 1); 1837#ifdef MRT6DEBUG 1838 if (mrt6debug & DEBUG_PIM) 1839 log(LOG_DEBUG, 1840 "pim6_input[register], eip6: %s -> %s, " 1841 "eip6 plen %d\n", 1842 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1843 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1844 ntohs(eip6->ip6_plen)); 1845#endif 1846 1847 /* verify the version number of the inner packet */ 1848 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1849 ++pim6stat.pim6s_rcv_badregisters; 1850#ifdef MRT6DEBUG 1851 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1852 "of the inner packet\n", 1853 (eip6->ip6_vfc & IPV6_VERSION)); 1854#endif 1855 m_freem(m); 1856 return (IPPROTO_NONE); 1857 } 1858 1859 /* verify the inner packet is destined to a mcast group */ 1860 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1861 ++pim6stat.pim6s_rcv_badregisters; 1862#ifdef MRT6DEBUG 1863 if (mrt6debug & DEBUG_PIM) 1864 log(LOG_DEBUG, 1865 "pim6_input: inner packet of register " 1866 "is not multicast %s\n", 1867 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1868#endif 1869 m_freem(m); 1870 return (IPPROTO_DONE); 1871 } 1872 1873 /* 1874 * make a copy of the whole header to pass to the daemon later. 1875 */ 1876 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1877 if (mcp == NULL) { 1878#ifdef MRT6DEBUG 1879 log(LOG_ERR, 1880 "pim6_input: pim register: " 1881 "could not copy register head\n"); 1882#endif 1883 m_freem(m); 1884 return (IPPROTO_DONE); 1885 } 1886 1887 /* 1888 * forward the inner ip6 packet; point m_data at the inner ip6. 1889 */ 1890 m_adj(m, off + PIM_MINLEN); 1891#ifdef MRT6DEBUG 1892 if (mrt6debug & DEBUG_PIM) { 1893 log(LOG_DEBUG, 1894 "pim6_input: forwarding decapsulated register: " 1895 "src %s, dst %s, mif %d\n", 1896 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1897 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1898 reg_mif_num); 1899 } 1900#endif 1901 1902 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1903 dst.sin6_family, 0); 1904 1905 /* prepare the register head to send to the mrouting daemon */ 1906 m = mcp; 1907 } 1908 1909 /* 1910 * Pass the PIM message up to the daemon; if it is a register message 1911 * pass the 'head' only up to the daemon. This includes the 1912 * encapsulator ip6 header, pim header, register header and the 1913 * encapsulated ip6 header. 1914 */ 1915 pim6_input_to_daemon: 1916 rip6_input(&m, offp, proto); 1917 return (IPPROTO_DONE); 1918} 1919