ip6_mroute.c revision 72091
1/* $FreeBSD: head/sys/netinet6/ip6_mroute.c 72091 2001-02-06 11:21:58Z asmodai $ */ 2/* $KAME: ip6_mroute.c,v 1.33 2000/10/19 02:23:43 jinmei 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 * IP multicast forwarding procedures 37 * 38 * Written by David Waitzman, BBN Labs, August 1988. 39 * Modified by Steve Deering, Stanford, February 1989. 40 * Modified by Mark J. Steiglitz, Stanford, May, 1991 41 * Modified by Van Jacobson, LBL, January 1993 42 * Modified by Ajit Thyagarajan, PARC, August 1993 43 * Modified by Bill Fenenr, PARC, April 1994 44 * 45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 46 */ 47 48#include "opt_inet.h" 49#include "opt_inet6.h" 50 51#include <sys/param.h> 52#include <sys/systm.h> 53#include <sys/malloc.h> 54#include <sys/mbuf.h> 55#include <sys/socket.h> 56#include <sys/socketvar.h> 57#include <sys/sockio.h> 58#include <sys/protosw.h> 59#include <sys/errno.h> 60#include <sys/time.h> 61#include <sys/kernel.h> 62#include <sys/syslog.h> 63 64#include <net/if.h> 65#include <net/route.h> 66#include <net/raw_cb.h> 67 68#include <netinet/in.h> 69#include <netinet/in_var.h> 70 71#include <netinet/ip6.h> 72#include <netinet6/ip6_var.h> 73#include <netinet6/ip6_mroute.h> 74#include <netinet6/pim6.h> 75#include <netinet6/pim6_var.h> 76 77#include <net/net_osdep.h> 78 79static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry"); 80 81#define M_HASCL(m) ((m)->m_flags & M_EXT) 82 83static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *)); 84static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *)); 85 86static int set_pim6 __P((int *)); 87static int socket_send __P((struct socket *, struct mbuf *, 88 struct sockaddr_in6 *)); 89static int register_send __P((struct ip6_hdr *, struct mif6 *, 90 struct mbuf *)); 91 92/* 93 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, 94 * except for netstat or debugging purposes. 95 */ 96struct socket *ip6_mrouter = NULL; 97int ip6_mrouter_ver = 0; 98int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ 99struct mrt6stat mrt6stat; 100 101#define NO_RTE_FOUND 0x1 102#define RTE_FOUND 0x2 103 104struct mf6c *mf6ctable[MF6CTBLSIZ]; 105u_char nexpire[MF6CTBLSIZ]; 106static struct mif6 mif6table[MAXMIFS]; 107#ifdef MRT6DEBUG 108u_int mrt6debug = 0; /* debug level */ 109#define DEBUG_MFC 0x02 110#define DEBUG_FORWARD 0x04 111#define DEBUG_EXPIRE 0x08 112#define DEBUG_XMIT 0x10 113#define DEBUG_REG 0x20 114#define DEBUG_PIM 0x40 115#endif 116 117static void expire_upcalls __P((void *)); 118#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 119#define UPCALL_EXPIRE 6 /* number of timeouts */ 120 121#ifdef INET 122#ifdef MROUTING 123extern struct socket *ip_mrouter; 124#endif 125#endif 126 127/* 128 * 'Interfaces' associated with decapsulator (so we can tell 129 * packets that went through it from ones that get reflected 130 * by a broken gateway). These interfaces are never linked into 131 * the system ifnet list & no routes point to them. I.e., packets 132 * can't be sent this way. They only exist as a placeholder for 133 * multicast source verification. 134 */ 135struct ifnet multicast_register_if; 136 137#define ENCAP_HOPS 64 138 139/* 140 * Private variables. 141 */ 142static mifi_t nummifs = 0; 143static mifi_t reg_mif_num = (mifi_t)-1; 144 145static struct pim6stat pim6stat; 146static struct callout_handle expire_upcalls_ch; 147 148/* 149 * one-back cache used by ipip_input to locate a tunnel's mif 150 * given a datagram's src ip address. 151 */ 152static int pim6; 153 154/* 155 * Hash function for a source, group entry 156 */ 157#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 158 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 159 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 160 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 161 162/* 163 * Find a route for a given origin IPv6 address and Multicast group address. 164 * Quality of service parameter to be added in the future!!! 165 */ 166 167#define MF6CFIND(o, g, rt) do { \ 168 register struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 169 rt = NULL; \ 170 mrt6stat.mrt6s_mfc_lookups++; \ 171 while (_rt) { \ 172 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 173 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 174 (_rt->mf6c_stall == NULL)) { \ 175 rt = _rt; \ 176 break; \ 177 } \ 178 _rt = _rt->mf6c_next; \ 179 } \ 180 if (rt == NULL) { \ 181 mrt6stat.mrt6s_mfc_misses++; \ 182 } \ 183} while (0) 184 185/* 186 * Macros to compute elapsed time efficiently 187 * Borrowed from Van Jacobson's scheduling code 188 */ 189#define TV_DELTA(a, b, delta) do { \ 190 register int xxs; \ 191 \ 192 delta = (a).tv_usec - (b).tv_usec; \ 193 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 194 switch (xxs) { \ 195 case 2: \ 196 delta += 1000000; \ 197 /* fall through */ \ 198 case 1: \ 199 delta += 1000000; \ 200 break; \ 201 default: \ 202 delta += (1000000 * xxs); \ 203 } \ 204 } \ 205} while (0) 206 207#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 208 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 209 210#ifdef UPCALL_TIMING 211#define UPCALL_MAX 50 212u_long upcall_data[UPCALL_MAX + 1]; 213static void collate(); 214#endif /* UPCALL_TIMING */ 215 216static int get_sg_cnt __P((struct sioc_sg_req6 *)); 217static int get_mif6_cnt __P((struct sioc_mif_req6 *)); 218static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int)); 219static int add_m6if __P((struct mif6ctl *)); 220static int del_m6if __P((mifi_t *)); 221static int add_m6fc __P((struct mf6cctl *)); 222static int del_m6fc __P((struct mf6cctl *)); 223 224/* 225 * Handle MRT setsockopt commands to modify the multicast routing tables. 226 */ 227int 228ip6_mrouter_set(so, sopt) 229 struct socket *so; 230 struct sockopt *sopt; 231{ 232 int error = 0; 233 struct mbuf *m; 234 235 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT) 236 return (EACCES); 237 238 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 239 return (error); 240 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 241 return (error); 242 243 switch (sopt->sopt_name) { 244 case MRT6_INIT: 245#ifdef MRT6_OINIT 246 case MRT6_OINIT: 247#endif 248 error = ip6_mrouter_init(so, m, sopt->sopt_name); 249 break; 250 case MRT6_DONE: 251 error = ip6_mrouter_done(); 252 break; 253 case MRT6_ADD_MIF: 254 error = add_m6if(mtod(m, struct mif6ctl *)); 255 break; 256 case MRT6_DEL_MIF: 257 error = del_m6if(mtod(m, mifi_t *)); 258 break; 259 case MRT6_ADD_MFC: 260 error = add_m6fc(mtod(m, struct mf6cctl *)); 261 break; 262 case MRT6_DEL_MFC: 263 error = del_m6fc(mtod(m, struct mf6cctl *)); 264 break; 265 case MRT6_PIM: 266 error = set_pim6(mtod(m, int *)); 267 break; 268 default: 269 error = EOPNOTSUPP; 270 break; 271 } 272 273 (void)m_freem(m); 274 return(error); 275} 276 277/* 278 * Handle MRT getsockopt commands 279 */ 280int 281ip6_mrouter_get(so, sopt) 282 struct socket *so; 283 struct sockopt *sopt; 284{ 285 int error = 0; 286 287 if (so != ip6_mrouter) return EACCES; 288 289 switch (sopt->sopt_name) { 290 case MRT6_PIM: 291 error = sooptcopyout(sopt, &pim6, sizeof(pim6)); 292 break; 293 } 294 return (error); 295} 296 297/* 298 * Handle ioctl commands to obtain information from the cache 299 */ 300int 301mrt6_ioctl(cmd, data) 302 int cmd; 303 caddr_t data; 304{ 305 int error = 0; 306 307 switch (cmd) { 308 case SIOCGETSGCNT_IN6: 309 return(get_sg_cnt((struct sioc_sg_req6 *)data)); 310 break; /* for safety */ 311 case SIOCGETMIFCNT_IN6: 312 return(get_mif6_cnt((struct sioc_mif_req6 *)data)); 313 break; /* for safety */ 314 default: 315 return (EINVAL); 316 break; 317 } 318 return error; 319} 320 321/* 322 * returns the packet, byte, rpf-failure count for the source group provided 323 */ 324static int 325get_sg_cnt(req) 326 register struct sioc_sg_req6 *req; 327{ 328 register struct mf6c *rt; 329 int s; 330 331 s = splnet(); 332 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 333 splx(s); 334 if (rt != NULL) { 335 req->pktcnt = rt->mf6c_pkt_cnt; 336 req->bytecnt = rt->mf6c_byte_cnt; 337 req->wrong_if = rt->mf6c_wrong_if; 338 } else 339 return(ESRCH); 340#if 0 341 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 342#endif 343 344 return 0; 345} 346 347/* 348 * returns the input and output packet and byte counts on the mif provided 349 */ 350static int 351get_mif6_cnt(req) 352 register struct sioc_mif_req6 *req; 353{ 354 register mifi_t mifi = req->mifi; 355 356 if (mifi >= nummifs) 357 return EINVAL; 358 359 req->icount = mif6table[mifi].m6_pkt_in; 360 req->ocount = mif6table[mifi].m6_pkt_out; 361 req->ibytes = mif6table[mifi].m6_bytes_in; 362 req->obytes = mif6table[mifi].m6_bytes_out; 363 364 return 0; 365} 366 367static int 368set_pim6(i) 369 int *i; 370{ 371 if ((*i != 1) && (*i != 0)) 372 return EINVAL; 373 374 pim6 = *i; 375 376 return 0; 377} 378 379/* 380 * Enable multicast routing 381 */ 382static int 383ip6_mrouter_init(so, m, cmd) 384 struct socket *so; 385 struct mbuf *m; 386 int cmd; 387{ 388 int *v; 389 390#ifdef MRT6DEBUG 391 if (mrt6debug) 392 log(LOG_DEBUG, 393 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 394 so->so_type, so->so_proto->pr_protocol); 395#endif 396 397 if (so->so_type != SOCK_RAW || 398 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 399 return EOPNOTSUPP; 400 401 if (!m || (m->m_len != sizeof(int *))) 402 return ENOPROTOOPT; 403 404 v = mtod(m, int *); 405 if (*v != 1) 406 return ENOPROTOOPT; 407 408 if (ip6_mrouter != NULL) return EADDRINUSE; 409 410 ip6_mrouter = so; 411 ip6_mrouter_ver = cmd; 412 413 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 414 bzero((caddr_t)nexpire, sizeof(nexpire)); 415 416 pim6 = 0;/* used for stubbing out/in pim stuff */ 417 418 expire_upcalls_ch = 419 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 420 421#ifdef MRT6DEBUG 422 if (mrt6debug) 423 log(LOG_DEBUG, "ip6_mrouter_init\n"); 424#endif 425 426 return 0; 427} 428 429/* 430 * Disable multicast routing 431 */ 432int 433ip6_mrouter_done() 434{ 435 mifi_t mifi; 436 int i; 437 struct ifnet *ifp; 438 struct in6_ifreq ifr; 439 struct mf6c *rt; 440 struct rtdetq *rte; 441 int s; 442 443 s = splnet(); 444 445 /* 446 * For each phyint in use, disable promiscuous reception of all IPv6 447 * multicasts. 448 */ 449#ifdef INET 450#ifdef MROUTING 451 /* 452 * If there is still IPv4 multicast routing daemon, 453 * we remain interfaces to receive all muliticasted packets. 454 * XXX: there may be an interface in which the IPv4 multicast 455 * daemon is not interested... 456 */ 457 if (!ip_mrouter) 458#endif 459#endif 460 { 461 for (mifi = 0; mifi < nummifs; mifi++) { 462 if (mif6table[mifi].m6_ifp && 463 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 464 ifr.ifr_addr.sin6_family = AF_INET6; 465 ifr.ifr_addr.sin6_addr= in6addr_any; 466 ifp = mif6table[mifi].m6_ifp; 467 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 468 (caddr_t)&ifr); 469 } 470 } 471 } 472#ifdef notyet 473 bzero((caddr_t)qtable, sizeof(qtable)); 474 bzero((caddr_t)tbftable, sizeof(tbftable)); 475#endif 476 bzero((caddr_t)mif6table, sizeof(mif6table)); 477 nummifs = 0; 478 479 pim6 = 0; /* used to stub out/in pim specific code */ 480 481 untimeout(expire_upcalls, (caddr_t)NULL, expire_upcalls_ch); 482 483 /* 484 * Free all multicast forwarding cache entries. 485 */ 486 for (i = 0; i < MF6CTBLSIZ; i++) { 487 rt = mf6ctable[i]; 488 while (rt) { 489 struct mf6c *frt; 490 491 for (rte = rt->mf6c_stall; rte != NULL; ) { 492 struct rtdetq *n = rte->next; 493 494 m_free(rte->m); 495 free(rte, M_MRTABLE); 496 rte = n; 497 } 498 frt = rt; 499 rt = rt->mf6c_next; 500 free(frt, M_MRTABLE); 501 } 502 } 503 504 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 505 506 /* 507 * Reset de-encapsulation cache 508 */ 509 reg_mif_num = -1; 510 511 ip6_mrouter = NULL; 512 ip6_mrouter_ver = 0; 513 514 splx(s); 515 516#ifdef MRT6DEBUG 517 if (mrt6debug) 518 log(LOG_DEBUG, "ip6_mrouter_done\n"); 519#endif 520 521 return 0; 522} 523 524static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 525 526/* 527 * Add a mif to the mif table 528 */ 529static int 530add_m6if(mifcp) 531 register struct mif6ctl *mifcp; 532{ 533 register struct mif6 *mifp; 534 struct ifnet *ifp; 535 int error, s; 536#ifdef notyet 537 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; 538#endif 539 540 if (mifcp->mif6c_mifi >= MAXMIFS) 541 return EINVAL; 542 mifp = mif6table + mifcp->mif6c_mifi; 543 if (mifp->m6_ifp) 544 return EADDRINUSE; /* XXX: is it appropriate? */ 545 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) 546 return ENXIO; 547 ifp = ifindex2ifnet[mifcp->mif6c_pifi]; 548 549 if (mifcp->mif6c_flags & MIFF_REGISTER) { 550 if (reg_mif_num == (mifi_t)-1) { 551 multicast_register_if.if_name = "register_mif"; 552 multicast_register_if.if_flags |= IFF_LOOPBACK; 553 multicast_register_if.if_index = mifcp->mif6c_mifi; 554 reg_mif_num = mifcp->mif6c_mifi; 555 } 556 557 ifp = &multicast_register_if; 558 559 } /* if REGISTER */ 560 else { 561 /* Make sure the interface supports multicast */ 562 if ((ifp->if_flags & IFF_MULTICAST) == 0) 563 return EOPNOTSUPP; 564 565 s = splnet(); 566 error = if_allmulti(ifp, 1); 567 splx(s); 568 if (error) 569 return error; 570 } 571 572 s = splnet(); 573 mifp->m6_flags = mifcp->mif6c_flags; 574 mifp->m6_ifp = ifp; 575#ifdef notyet 576 /* scaling up here allows division by 1024 in critical code */ 577 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; 578#endif 579 /* initialize per mif pkt counters */ 580 mifp->m6_pkt_in = 0; 581 mifp->m6_pkt_out = 0; 582 mifp->m6_bytes_in = 0; 583 mifp->m6_bytes_out = 0; 584 splx(s); 585 586 /* Adjust nummifs up if the mifi is higher than nummifs */ 587 if (nummifs <= mifcp->mif6c_mifi) 588 nummifs = mifcp->mif6c_mifi + 1; 589 590#ifdef MRT6DEBUG 591 if (mrt6debug) 592 log(LOG_DEBUG, 593 "add_mif #%d, phyint %s%d\n", 594 mifcp->mif6c_mifi, 595 ifp->if_name, ifp->if_unit); 596#endif 597 598 return 0; 599} 600 601/* 602 * Delete a mif from the mif table 603 */ 604static int 605del_m6if(mifip) 606 mifi_t *mifip; 607{ 608 register struct mif6 *mifp = mif6table + *mifip; 609 register mifi_t mifi; 610 struct ifnet *ifp; 611 int s; 612 613 if (*mifip >= nummifs) 614 return EINVAL; 615 if (mifp->m6_ifp == NULL) 616 return EINVAL; 617 618 s = splnet(); 619 620 if (!(mifp->m6_flags & MIFF_REGISTER)) { 621 /* 622 * XXX: what if there is yet IPv4 multicast daemon 623 * using the interface? 624 */ 625 ifp = mifp->m6_ifp; 626 627 if_allmulti(ifp, 0); 628 } 629 630#ifdef notyet 631 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); 632 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); 633#endif 634 bzero((caddr_t)mifp, sizeof (*mifp)); 635 636 /* Adjust nummifs down */ 637 for (mifi = nummifs; mifi > 0; mifi--) 638 if (mif6table[mifi - 1].m6_ifp) 639 break; 640 nummifs = mifi; 641 642 splx(s); 643 644#ifdef MRT6DEBUG 645 if (mrt6debug) 646 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 647#endif 648 649 return 0; 650} 651 652/* 653 * Add an mfc entry 654 */ 655static int 656add_m6fc(mfccp) 657 struct mf6cctl *mfccp; 658{ 659 struct mf6c *rt; 660 u_long hash; 661 struct rtdetq *rte; 662 register u_short nstl; 663 int s; 664 665 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 666 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 667 668 /* If an entry already exists, just update the fields */ 669 if (rt) { 670#ifdef MRT6DEBUG 671 if (mrt6debug & DEBUG_MFC) 672 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", 673 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 674 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 675 mfccp->mf6cc_parent); 676#endif 677 678 s = splnet(); 679 rt->mf6c_parent = mfccp->mf6cc_parent; 680 rt->mf6c_ifset = mfccp->mf6cc_ifset; 681 splx(s); 682 return 0; 683 } 684 685 /* 686 * Find the entry for which the upcall was made and update 687 */ 688 s = splnet(); 689 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 690 mfccp->mf6cc_mcastgrp.sin6_addr); 691 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 692 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 693 &mfccp->mf6cc_origin.sin6_addr) && 694 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 695 &mfccp->mf6cc_mcastgrp.sin6_addr) && 696 (rt->mf6c_stall != NULL)) { 697 698 if (nstl++) 699 log(LOG_ERR, 700 "add_m6fc: %s o %s g %s p %x dbx %p\n", 701 "multiple kernel entries", 702 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 703 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 704 mfccp->mf6cc_parent, rt->mf6c_stall); 705 706#ifdef MRT6DEBUG 707 if (mrt6debug & DEBUG_MFC) 708 log(LOG_DEBUG, 709 "add_m6fc o %s g %s p %x dbg %x\n", 710 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 711 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 712 mfccp->mf6cc_parent, rt->mf6c_stall); 713#endif 714 715 rt->mf6c_origin = mfccp->mf6cc_origin; 716 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 717 rt->mf6c_parent = mfccp->mf6cc_parent; 718 rt->mf6c_ifset = mfccp->mf6cc_ifset; 719 /* initialize pkt counters per src-grp */ 720 rt->mf6c_pkt_cnt = 0; 721 rt->mf6c_byte_cnt = 0; 722 rt->mf6c_wrong_if = 0; 723 724 rt->mf6c_expire = 0; /* Don't clean this guy up */ 725 nexpire[hash]--; 726 727 /* free packets Qed at the end of this entry */ 728 for (rte = rt->mf6c_stall; rte != NULL; ) { 729 struct rtdetq *n = rte->next; 730 ip6_mdq(rte->m, rte->ifp, rt); 731 m_freem(rte->m); 732#ifdef UPCALL_TIMING 733 collate(&(rte->t)); 734#endif /* UPCALL_TIMING */ 735 free(rte, M_MRTABLE); 736 rte = n; 737 } 738 rt->mf6c_stall = NULL; 739 } 740 } 741 742 /* 743 * It is possible that an entry is being inserted without an upcall 744 */ 745 if (nstl == 0) { 746#ifdef MRT6DEBUG 747 if (mrt6debug & DEBUG_MFC) 748 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n", 749 hash, 750 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), 751 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), 752 mfccp->mf6cc_parent); 753#endif 754 755 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 756 757 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 758 &mfccp->mf6cc_origin.sin6_addr)&& 759 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 760 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 761 762 rt->mf6c_origin = mfccp->mf6cc_origin; 763 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 764 rt->mf6c_parent = mfccp->mf6cc_parent; 765 rt->mf6c_ifset = mfccp->mf6cc_ifset; 766 /* initialize pkt counters per src-grp */ 767 rt->mf6c_pkt_cnt = 0; 768 rt->mf6c_byte_cnt = 0; 769 rt->mf6c_wrong_if = 0; 770 771 if (rt->mf6c_expire) 772 nexpire[hash]--; 773 rt->mf6c_expire = 0; 774 } 775 } 776 if (rt == NULL) { 777 /* no upcall, so make a new entry */ 778 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 779 M_NOWAIT); 780 if (rt == NULL) { 781 splx(s); 782 return ENOBUFS; 783 } 784 785 /* insert new entry at head of hash chain */ 786 rt->mf6c_origin = mfccp->mf6cc_origin; 787 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 788 rt->mf6c_parent = mfccp->mf6cc_parent; 789 rt->mf6c_ifset = mfccp->mf6cc_ifset; 790 /* initialize pkt counters per src-grp */ 791 rt->mf6c_pkt_cnt = 0; 792 rt->mf6c_byte_cnt = 0; 793 rt->mf6c_wrong_if = 0; 794 rt->mf6c_expire = 0; 795 rt->mf6c_stall = NULL; 796 797 /* link into table */ 798 rt->mf6c_next = mf6ctable[hash]; 799 mf6ctable[hash] = rt; 800 } 801 } 802 splx(s); 803 return 0; 804} 805 806#ifdef UPCALL_TIMING 807/* 808 * collect delay statistics on the upcalls 809 */ 810static void 811collate(t) 812 register struct timeval *t; 813{ 814 register u_long d; 815 register struct timeval tp; 816 register u_long delta; 817 818 GET_TIME(tp); 819 820 if (TV_LT(*t, tp)) 821 { 822 TV_DELTA(tp, *t, delta); 823 824 d = delta >> 10; 825 if (d > UPCALL_MAX) 826 d = UPCALL_MAX; 827 828 ++upcall_data[d]; 829 } 830} 831#endif /* UPCALL_TIMING */ 832 833/* 834 * Delete an mfc entry 835 */ 836static int 837del_m6fc(mfccp) 838 struct mf6cctl *mfccp; 839{ 840 struct sockaddr_in6 origin; 841 struct sockaddr_in6 mcastgrp; 842 struct mf6c *rt; 843 struct mf6c **nptr; 844 u_long hash; 845 int s; 846 847 origin = mfccp->mf6cc_origin; 848 mcastgrp = mfccp->mf6cc_mcastgrp; 849 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 850 851#ifdef MRT6DEBUG 852 if (mrt6debug & DEBUG_MFC) 853 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 854 ip6_sprintf(&origin.sin6_addr), 855 ip6_sprintf(&mcastgrp.sin6_addr)); 856#endif 857 858 s = splnet(); 859 860 nptr = &mf6ctable[hash]; 861 while ((rt = *nptr) != NULL) { 862 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 863 &rt->mf6c_origin.sin6_addr) && 864 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 865 &rt->mf6c_mcastgrp.sin6_addr) && 866 rt->mf6c_stall == NULL) 867 break; 868 869 nptr = &rt->mf6c_next; 870 } 871 if (rt == NULL) { 872 splx(s); 873 return EADDRNOTAVAIL; 874 } 875 876 *nptr = rt->mf6c_next; 877 free(rt, M_MRTABLE); 878 879 splx(s); 880 881 return 0; 882} 883 884static int 885socket_send(s, mm, src) 886 struct socket *s; 887 struct mbuf *mm; 888 struct sockaddr_in6 *src; 889{ 890 if (s) { 891 if (sbappendaddr(&s->so_rcv, 892 (struct sockaddr *)src, 893 mm, (struct mbuf *)0) != 0) { 894 sorwakeup(s); 895 return 0; 896 } 897 } 898 m_freem(mm); 899 return -1; 900} 901 902/* 903 * IPv6 multicast forwarding function. This function assumes that the packet 904 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 905 * pointed to by "ifp", and the packet is to be relayed to other networks 906 * that have members of the packet's destination IPv6 multicast group. 907 * 908 * The packet is returned unscathed to the caller, unless it is 909 * erroneous, in which case a non-zero return value tells the caller to 910 * discard it. 911 */ 912 913int 914ip6_mforward(ip6, ifp, m) 915 register struct ip6_hdr *ip6; 916 struct ifnet *ifp; 917 struct mbuf *m; 918{ 919 register struct mf6c *rt; 920 register struct mif6 *mifp; 921 register struct mbuf *mm; 922 int s; 923 mifi_t mifi; 924 925#ifdef MRT6DEBUG 926 if (mrt6debug & DEBUG_FORWARD) 927 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 928 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), 929 ifp->if_index); 930#endif 931 932 /* 933 * Don't forward a packet with Hop limit of zero or one, 934 * or a packet destined to a local-only group. 935 */ 936 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || 937 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 938 return 0; 939 ip6->ip6_hlim--; 940 941 /* 942 * Source address check: do not forward packets with unspecified 943 * source. It was discussed in July 2000, on ipngwg mailing list. 944 * This is rather more serious than unicast cases, because some 945 * MLD packets can be sent with the unspecified source address 946 * (although such packets must normally set 1 to the hop limit field). 947 */ 948 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 949 ip6stat.ip6s_cantforward++; 950 if (ip6_log_time + ip6_log_interval < time_second) { 951 ip6_log_time = time_second; 952 log(LOG_DEBUG, 953 "cannot forward " 954 "from %s to %s nxt %d received on %s\n", 955 ip6_sprintf(&ip6->ip6_src), 956 ip6_sprintf(&ip6->ip6_dst), 957 ip6->ip6_nxt, 958 if_name(m->m_pkthdr.rcvif)); 959 } 960 return 0; 961 } 962 963 /* 964 * Determine forwarding mifs from the forwarding cache table 965 */ 966 s = splnet(); 967 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 968 969 /* Entry exists, so forward if necessary */ 970 if (rt) { 971 splx(s); 972 return (ip6_mdq(m, ifp, rt)); 973 } else { 974 /* 975 * If we don't have a route for packet's origin, 976 * Make a copy of the packet & 977 * send message to routing daemon 978 */ 979 980 register struct mbuf *mb0; 981 register struct rtdetq *rte; 982 register u_long hash; 983/* register int i, npkts;*/ 984#ifdef UPCALL_TIMING 985 struct timeval tp; 986 987 GET_TIME(tp); 988#endif /* UPCALL_TIMING */ 989 990 mrt6stat.mrt6s_no_route++; 991#ifdef MRT6DEBUG 992 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 993 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 994 ip6_sprintf(&ip6->ip6_src), 995 ip6_sprintf(&ip6->ip6_dst)); 996#endif 997 998 /* 999 * Allocate mbufs early so that we don't do extra work if we 1000 * are just going to fail anyway. 1001 */ 1002 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1003 M_NOWAIT); 1004 if (rte == NULL) { 1005 splx(s); 1006 return ENOBUFS; 1007 } 1008 mb0 = m_copy(m, 0, M_COPYALL); 1009 /* 1010 * Pullup packet header if needed before storing it, 1011 * as other references may modify it in the meantime. 1012 */ 1013 if (mb0 && 1014 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1015 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1016 if (mb0 == NULL) { 1017 free(rte, M_MRTABLE); 1018 splx(s); 1019 return ENOBUFS; 1020 } 1021 1022 /* is there an upcall waiting for this packet? */ 1023 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1024 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1025 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1026 &rt->mf6c_origin.sin6_addr) && 1027 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1028 &rt->mf6c_mcastgrp.sin6_addr) && 1029 (rt->mf6c_stall != NULL)) 1030 break; 1031 } 1032 1033 if (rt == NULL) { 1034 struct mrt6msg *im; 1035#ifdef MRT6_OINIT 1036 struct omrt6msg *oim; 1037#endif 1038 1039 /* no upcall, so make a new entry */ 1040 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, 1041 M_NOWAIT); 1042 if (rt == NULL) { 1043 free(rte, M_MRTABLE); 1044 m_freem(mb0); 1045 splx(s); 1046 return ENOBUFS; 1047 } 1048 /* 1049 * Make a copy of the header to send to the user 1050 * level process 1051 */ 1052 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1053 1054 if (mm == NULL) { 1055 free(rte, M_MRTABLE); 1056 m_freem(mb0); 1057 free(rt, M_MRTABLE); 1058 splx(s); 1059 return ENOBUFS; 1060 } 1061 1062 /* 1063 * Send message to routing daemon 1064 */ 1065 sin6.sin6_addr = ip6->ip6_src; 1066 1067 im = NULL; 1068#ifdef MRT6_OINIT 1069 oim = NULL; 1070#endif 1071 switch (ip6_mrouter_ver) { 1072#ifdef MRT6_OINIT 1073 case MRT6_OINIT: 1074 oim = mtod(mm, struct omrt6msg *); 1075 oim->im6_msgtype = MRT6MSG_NOCACHE; 1076 oim->im6_mbz = 0; 1077 break; 1078#endif 1079 case MRT6_INIT: 1080 im = mtod(mm, struct mrt6msg *); 1081 im->im6_msgtype = MRT6MSG_NOCACHE; 1082 im->im6_mbz = 0; 1083 break; 1084 default: 1085 free(rte, M_MRTABLE); 1086 m_freem(mb0); 1087 free(rt, M_MRTABLE); 1088 splx(s); 1089 return EINVAL; 1090 } 1091 1092#ifdef MRT6DEBUG 1093 if (mrt6debug & DEBUG_FORWARD) 1094 log(LOG_DEBUG, 1095 "getting the iif info in the kernel\n"); 1096#endif 1097 1098 for (mifp = mif6table, mifi = 0; 1099 mifi < nummifs && mifp->m6_ifp != ifp; 1100 mifp++, mifi++) 1101 ; 1102 1103 switch (ip6_mrouter_ver) { 1104#ifdef MRT6_OINIT 1105 case MRT6_OINIT: 1106 oim->im6_mif = mifi; 1107 break; 1108#endif 1109 case MRT6_INIT: 1110 im->im6_mif = mifi; 1111 break; 1112 } 1113 1114 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1115 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1116 "socket queue full\n"); 1117 mrt6stat.mrt6s_upq_sockfull++; 1118 free(rte, M_MRTABLE); 1119 m_freem(mb0); 1120 free(rt, M_MRTABLE); 1121 splx(s); 1122 return ENOBUFS; 1123 } 1124 1125 mrt6stat.mrt6s_upcalls++; 1126 1127 /* insert new entry at head of hash chain */ 1128 bzero(rt, sizeof(*rt)); 1129 rt->mf6c_origin.sin6_family = AF_INET6; 1130 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1131 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1132 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1133 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1134 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1135 rt->mf6c_expire = UPCALL_EXPIRE; 1136 nexpire[hash]++; 1137 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1138 1139 /* link into table */ 1140 rt->mf6c_next = mf6ctable[hash]; 1141 mf6ctable[hash] = rt; 1142 /* Add this entry to the end of the queue */ 1143 rt->mf6c_stall = rte; 1144 } else { 1145 /* determine if q has overflowed */ 1146 struct rtdetq **p; 1147 register int npkts = 0; 1148 1149 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1150 if (++npkts > MAX_UPQ6) { 1151 mrt6stat.mrt6s_upq_ovflw++; 1152 free(rte, M_MRTABLE); 1153 m_freem(mb0); 1154 splx(s); 1155 return 0; 1156 } 1157 1158 /* Add this entry to the end of the queue */ 1159 *p = rte; 1160 } 1161 1162 rte->next = NULL; 1163 rte->m = mb0; 1164 rte->ifp = ifp; 1165#ifdef UPCALL_TIMING 1166 rte->t = tp; 1167#endif /* UPCALL_TIMING */ 1168 1169 splx(s); 1170 1171 return 0; 1172 } 1173} 1174 1175/* 1176 * Clean up cache entries if upcalls are not serviced 1177 * Call from the Slow Timeout mechanism, every half second. 1178 */ 1179static void 1180expire_upcalls(unused) 1181 void *unused; 1182{ 1183 struct rtdetq *rte; 1184 struct mf6c *mfc, **nptr; 1185 int i; 1186 int s; 1187 1188 s = splnet(); 1189 for (i = 0; i < MF6CTBLSIZ; i++) { 1190 if (nexpire[i] == 0) 1191 continue; 1192 nptr = &mf6ctable[i]; 1193 while ((mfc = *nptr) != NULL) { 1194 rte = mfc->mf6c_stall; 1195 /* 1196 * Skip real cache entries 1197 * Make sure it wasn't marked to not expire (shouldn't happen) 1198 * If it expires now 1199 */ 1200 if (rte != NULL && 1201 mfc->mf6c_expire != 0 && 1202 --mfc->mf6c_expire == 0) { 1203#ifdef MRT6DEBUG 1204 if (mrt6debug & DEBUG_EXPIRE) 1205 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1206 ip6_sprintf(&mfc->mf6c_origin.sin6_addr), 1207 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); 1208#endif 1209 /* 1210 * drop all the packets 1211 * free the mbuf with the pkt, if, timing info 1212 */ 1213 do { 1214 struct rtdetq *n = rte->next; 1215 m_freem(rte->m); 1216 free(rte, M_MRTABLE); 1217 rte = n; 1218 } while (rte != NULL); 1219 mrt6stat.mrt6s_cache_cleanups++; 1220 nexpire[i]--; 1221 1222 *nptr = mfc->mf6c_next; 1223 free(mfc, M_MRTABLE); 1224 } else { 1225 nptr = &mfc->mf6c_next; 1226 } 1227 } 1228 } 1229 splx(s); 1230 expire_upcalls_ch = 1231 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 1232} 1233 1234/* 1235 * Packet forwarding routine once entry in the cache is made 1236 */ 1237static int 1238ip6_mdq(m, ifp, rt) 1239 register struct mbuf *m; 1240 register struct ifnet *ifp; 1241 register struct mf6c *rt; 1242{ 1243 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1244 register mifi_t mifi, iif; 1245 register struct mif6 *mifp; 1246 register int plen = m->m_pkthdr.len; 1247 1248/* 1249 * Macro to send packet on mif. Since RSVP packets don't get counted on 1250 * input, they shouldn't get counted on output, so statistics keeping is 1251 * separate. 1252 */ 1253 1254#define MC6_SEND(ip6, mifp, m) do { \ 1255 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1256 register_send((ip6), (mifp), (m)); \ 1257 else \ 1258 phyint_send((ip6), (mifp), (m)); \ 1259} while (0) 1260 1261 /* 1262 * Don't forward if it didn't arrive from the parent mif 1263 * for its origin. 1264 */ 1265 mifi = rt->mf6c_parent; 1266 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1267 /* came in the wrong interface */ 1268#ifdef MRT6DEBUG 1269 if (mrt6debug & DEBUG_FORWARD) 1270 log(LOG_DEBUG, 1271 "wrong if: ifid %d mifi %d mififid %x\n", 1272 ifp->if_index, mifi, 1273 mif6table[mifi].m6_ifp->if_index); 1274#endif 1275 mrt6stat.mrt6s_wrong_if++; 1276 rt->mf6c_wrong_if++; 1277 /* 1278 * If we are doing PIM processing, and we are forwarding 1279 * packets on this interface, send a message to the 1280 * routing daemon. 1281 */ 1282 /* have to make sure this is a valid mif */ 1283 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1284 if (pim6 && (m->m_flags & M_LOOP) == 0) { 1285 /* 1286 * Check the M_LOOP flag to avoid an 1287 * unnecessary PIM assert. 1288 * XXX: M_LOOP is an ad-hoc hack... 1289 */ 1290 static struct sockaddr_in6 sin6 = 1291 { sizeof(sin6), AF_INET6 }; 1292 1293 register struct mbuf *mm; 1294 struct mrt6msg *im; 1295#ifdef MRT6_OINIT 1296 struct omrt6msg *oim; 1297#endif 1298 1299 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1300 if (mm && 1301 (M_HASCL(mm) || 1302 mm->m_len < sizeof(struct ip6_hdr))) 1303 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1304 if (mm == NULL) 1305 return ENOBUFS; 1306 1307#ifdef MRT6_OINIT 1308 oim = NULL; 1309#endif 1310 im = NULL; 1311 switch (ip6_mrouter_ver) { 1312#ifdef MRT6_OINIT 1313 case MRT6_OINIT: 1314 oim = mtod(mm, struct omrt6msg *); 1315 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1316 oim->im6_mbz = 0; 1317 break; 1318#endif 1319 case MRT6_INIT: 1320 im = mtod(mm, struct mrt6msg *); 1321 im->im6_msgtype = MRT6MSG_WRONGMIF; 1322 break; 1323 default: 1324 m_freem(mm); 1325 return EINVAL; 1326 } 1327 1328 for (mifp = mif6table, iif = 0; 1329 iif < nummifs && mifp && 1330 mifp->m6_ifp != ifp; 1331 mifp++, iif++) 1332 ; 1333 1334 switch (ip6_mrouter_ver) { 1335#ifdef MRT6_OINIT 1336 case MRT6_OINIT: 1337 oim->im6_mif = iif; 1338 sin6.sin6_addr = oim->im6_src; 1339 break; 1340#endif 1341 case MRT6_INIT: 1342 im->im6_mif = iif; 1343 sin6.sin6_addr = im->im6_src; 1344 break; 1345 } 1346 1347 mrt6stat.mrt6s_upcalls++; 1348 1349 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1350#ifdef MRT6DEBUG 1351 if (mrt6debug) 1352 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1353#endif 1354 ++mrt6stat.mrt6s_upq_sockfull; 1355 return ENOBUFS; 1356 } /* if socket Q full */ 1357 } /* if PIM */ 1358 return 0; 1359 } /* if wrong iif */ 1360 1361 /* If I sourced this packet, it counts as output, else it was input. */ 1362 if (m->m_pkthdr.rcvif == NULL) { 1363 /* XXX: is rcvif really NULL when output?? */ 1364 mif6table[mifi].m6_pkt_out++; 1365 mif6table[mifi].m6_bytes_out += plen; 1366 } else { 1367 mif6table[mifi].m6_pkt_in++; 1368 mif6table[mifi].m6_bytes_in += plen; 1369 } 1370 rt->mf6c_pkt_cnt++; 1371 rt->mf6c_byte_cnt += plen; 1372 1373 /* 1374 * For each mif, forward a copy of the packet if there are group 1375 * members downstream on the interface. 1376 */ 1377 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) 1378 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1379 /* 1380 * check if the outgoing packet is going to break 1381 * a scope boundary. 1382 * XXX For packets through PIM register tunnel 1383 * interface, we believe a routing daemon. 1384 */ 1385 if ((mif6table[rt->mf6c_parent].m6_flags & 1386 MIFF_REGISTER) == 0 && 1387 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && 1388 (in6_addr2scopeid(ifp, &ip6->ip6_dst) != 1389 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1390 &ip6->ip6_dst) || 1391 in6_addr2scopeid(ifp, &ip6->ip6_src) != 1392 in6_addr2scopeid(mif6table[mifi].m6_ifp, 1393 &ip6->ip6_src))) { 1394 ip6stat.ip6s_badscope++; 1395 continue; 1396 } 1397 1398 mifp->m6_pkt_out++; 1399 mifp->m6_bytes_out += plen; 1400 MC6_SEND(ip6, mifp, m); 1401 } 1402 return 0; 1403} 1404 1405static void 1406phyint_send(ip6, mifp, m) 1407 struct ip6_hdr *ip6; 1408 struct mif6 *mifp; 1409 struct mbuf *m; 1410{ 1411 register struct mbuf *mb_copy; 1412 struct ifnet *ifp = mifp->m6_ifp; 1413 int error = 0; 1414 int s = splnet(); 1415 static struct route_in6 ro6; 1416 struct in6_multi *in6m; 1417 1418 /* 1419 * Make a new reference to the packet; make sure that 1420 * the IPv6 header is actually copied, not just referenced, 1421 * so that ip6_output() only scribbles on the copy. 1422 */ 1423 mb_copy = m_copy(m, 0, M_COPYALL); 1424 if (mb_copy && 1425 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1426 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1427 if (mb_copy == NULL) 1428 return; 1429 /* set MCAST flag to the outgoing packet */ 1430 mb_copy->m_flags |= M_MCAST; 1431 1432 /* 1433 * If we sourced the packet, call ip6_output since we may devide 1434 * the packet into fragments when the packet is too big for the 1435 * outgoing interface. 1436 * Otherwise, we can simply send the packet to the interface 1437 * sending queue. 1438 */ 1439 if (m->m_pkthdr.rcvif == NULL) { 1440 struct ip6_moptions im6o; 1441 1442 im6o.im6o_multicast_ifp = ifp; 1443 /* XXX: ip6_output will override ip6->ip6_hlim */ 1444 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1445 im6o.im6o_multicast_loop = 1; 1446 error = ip6_output(mb_copy, NULL, &ro6, 1447 IPV6_FORWARDING, &im6o, NULL); 1448 1449#ifdef MRT6DEBUG 1450 if (mrt6debug & DEBUG_XMIT) 1451 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1452 mifp - mif6table, error); 1453#endif 1454 splx(s); 1455 return; 1456 } 1457 1458 /* 1459 * If we belong to the destination multicast group 1460 * on the outgoing interface, loop back a copy. 1461 */ 1462 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 1463 if (in6m != NULL) { 1464 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1465 ro6.ro_dst.sin6_family = AF_INET6; 1466 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1467 ip6_mloopback(ifp, m, &ro6.ro_dst); 1468 } 1469 /* 1470 * Put the packet into the sending queue of the outgoing interface 1471 * if it would fit in the MTU of the interface. 1472 */ 1473 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) { 1474 ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 1475 ro6.ro_dst.sin6_family = AF_INET6; 1476 ro6.ro_dst.sin6_addr = ip6->ip6_dst; 1477 /* 1478 * We just call if_output instead of nd6_output here, since 1479 * we need no ND for a multicast forwarded packet...right? 1480 */ 1481 error = (*ifp->if_output)(ifp, mb_copy, 1482 (struct sockaddr *)&ro6.ro_dst, 1483 NULL); 1484#ifdef MRT6DEBUG 1485 if (mrt6debug & DEBUG_XMIT) 1486 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1487 mifp - mif6table, error); 1488#endif 1489 } 1490 else { 1491#ifdef MULTICAST_PMTUD 1492 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 1493 return; 1494#else 1495#ifdef MRT6DEBUG 1496 if (mrt6debug & DEBUG_XMIT) 1497 log(LOG_DEBUG, 1498 "phyint_send: packet too big on %s%u o %s g %s" 1499 " size %d(discarded)\n", 1500 ifp->if_name, ifp->if_unit, 1501 ip6_sprintf(&ip6->ip6_src), 1502 ip6_sprintf(&ip6->ip6_dst), 1503 mb_copy->m_pkthdr.len); 1504#endif /* MRT6DEBUG */ 1505 m_freem(mb_copy); /* simply discard the packet */ 1506 return; 1507#endif 1508 } 1509} 1510 1511static int 1512register_send(ip6, mif, m) 1513 register struct ip6_hdr *ip6; 1514 struct mif6 *mif; 1515 register struct mbuf *m; 1516{ 1517 register struct mbuf *mm; 1518 register int i, len = m->m_pkthdr.len; 1519 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1520 struct mrt6msg *im6; 1521 1522#ifdef MRT6DEBUG 1523 if (mrt6debug) 1524 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1525 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); 1526#endif 1527 ++pim6stat.pim6s_snd_registers; 1528 1529 /* Make a copy of the packet to send to the user level process */ 1530 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1531 if (mm == NULL) 1532 return ENOBUFS; 1533 mm->m_data += max_linkhdr; 1534 mm->m_len = sizeof(struct ip6_hdr); 1535 1536 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1537 m_freem(mm); 1538 return ENOBUFS; 1539 } 1540 i = MHLEN - M_LEADINGSPACE(mm); 1541 if (i > len) 1542 i = len; 1543 mm = m_pullup(mm, i); 1544 if (mm == NULL){ 1545 m_freem(mm); 1546 return ENOBUFS; 1547 } 1548/* TODO: check it! */ 1549 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1550 1551 /* 1552 * Send message to routing daemon 1553 */ 1554 sin6.sin6_addr = ip6->ip6_src; 1555 1556 im6 = mtod(mm, struct mrt6msg *); 1557 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1558 im6->im6_mbz = 0; 1559 1560 im6->im6_mif = mif - mif6table; 1561 1562 /* iif info is not given for reg. encap.n */ 1563 mrt6stat.mrt6s_upcalls++; 1564 1565 if (socket_send(ip6_mrouter, mm, &sin6) < 0) { 1566#ifdef MRT6DEBUG 1567 if (mrt6debug) 1568 log(LOG_WARNING, 1569 "register_send: ip_mrouter socket queue full\n"); 1570#endif 1571 ++mrt6stat.mrt6s_upq_sockfull; 1572 return ENOBUFS; 1573 } 1574 return 0; 1575} 1576 1577/* 1578 * PIM sparse mode hook 1579 * Receives the pim control messages, and passes them up to the listening 1580 * socket, using rip6_input. 1581 * The only message processed is the REGISTER pim message; the pim header 1582 * is stripped off, and the inner packet is passed to register_mforward. 1583 */ 1584int 1585pim6_input(mp, offp, proto) 1586 struct mbuf **mp; 1587 int *offp, proto; 1588{ 1589 register struct pim *pim; /* pointer to a pim struct */ 1590 register struct ip6_hdr *ip6; 1591 register int pimlen; 1592 struct mbuf *m = *mp; 1593 int minlen; 1594 int off = *offp; 1595 1596 ++pim6stat.pim6s_rcv_total; 1597 1598 ip6 = mtod(m, struct ip6_hdr *); 1599 pimlen = m->m_pkthdr.len - *offp; 1600 1601 /* 1602 * Validate lengths 1603 */ 1604 if (pimlen < PIM_MINLEN) { 1605 ++pim6stat.pim6s_rcv_tooshort; 1606#ifdef MRT6DEBUG 1607 if (mrt6debug & DEBUG_PIM) 1608 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1609#endif 1610 m_freem(m); 1611 return(IPPROTO_DONE); 1612 } 1613 1614 /* 1615 * if the packet is at least as big as a REGISTER, go ahead 1616 * and grab the PIM REGISTER header size, to avoid another 1617 * possible m_pullup() later. 1618 * 1619 * PIM_MINLEN == pimhdr + u_int32 == 8 1620 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1621 */ 1622 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1623 1624 /* 1625 * Make sure that the IP6 and PIM headers in contiguous memory, and 1626 * possibly the PIM REGISTER header 1627 */ 1628#ifndef PULLDOWN_TEST 1629 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1630 /* adjust pointer */ 1631 ip6 = mtod(m, struct ip6_hdr *); 1632 1633 /* adjust mbuf to point to the PIM header */ 1634 pim = (struct pim *)((caddr_t)ip6 + off); 1635#else 1636 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1637 if (pim == NULL) { 1638 pim6stat.pim6s_rcv_tooshort++; 1639 return IPPROTO_DONE; 1640 } 1641#endif 1642 1643#define PIM6_CHECKSUM 1644#ifdef PIM6_CHECKSUM 1645 { 1646 int cksumlen; 1647 1648 /* 1649 * Validate checksum. 1650 * If PIM REGISTER, exclude the data packet 1651 */ 1652 if (pim->pim_type == PIM_REGISTER) 1653 cksumlen = PIM_MINLEN; 1654 else 1655 cksumlen = pimlen; 1656 1657 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1658 ++pim6stat.pim6s_rcv_badsum; 1659#ifdef MRT6DEBUG 1660 if (mrt6debug & DEBUG_PIM) 1661 log(LOG_DEBUG, 1662 "pim6_input: invalid checksum\n"); 1663#endif 1664 m_freem(m); 1665 return(IPPROTO_DONE); 1666 } 1667 } 1668#endif /* PIM_CHECKSUM */ 1669 1670 /* PIM version check */ 1671 if (pim->pim_ver != PIM_VERSION) { 1672 ++pim6stat.pim6s_rcv_badversion; 1673#ifdef MRT6DEBUG 1674 log(LOG_ERR, 1675 "pim6_input: incorrect version %d, expecting %d\n", 1676 pim->pim_ver, PIM_VERSION); 1677#endif 1678 m_freem(m); 1679 return(IPPROTO_DONE); 1680 } 1681 1682 if (pim->pim_type == PIM_REGISTER) { 1683 /* 1684 * since this is a REGISTER, we'll make a copy of the register 1685 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1686 * routing daemon. 1687 */ 1688 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1689 1690 struct mbuf *mcp; 1691 struct ip6_hdr *eip6; 1692 u_int32_t *reghdr; 1693 int rc; 1694 1695 ++pim6stat.pim6s_rcv_registers; 1696 1697 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1698#ifdef MRT6DEBUG 1699 if (mrt6debug & DEBUG_PIM) 1700 log(LOG_DEBUG, 1701 "pim6_input: register mif not set: %d\n", 1702 reg_mif_num); 1703#endif 1704 m_freem(m); 1705 return(IPPROTO_DONE); 1706 } 1707 1708 reghdr = (u_int32_t *)(pim + 1); 1709 1710 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1711 goto pim6_input_to_daemon; 1712 1713 /* 1714 * Validate length 1715 */ 1716 if (pimlen < PIM6_REG_MINLEN) { 1717 ++pim6stat.pim6s_rcv_tooshort; 1718 ++pim6stat.pim6s_rcv_badregisters; 1719#ifdef MRT6DEBUG 1720 log(LOG_ERR, 1721 "pim6_input: register packet size too " 1722 "small %d from %s\n", 1723 pimlen, ip6_sprintf(&ip6->ip6_src)); 1724#endif 1725 m_freem(m); 1726 return(IPPROTO_DONE); 1727 } 1728 1729 eip6 = (struct ip6_hdr *) (reghdr + 1); 1730#ifdef MRT6DEBUG 1731 if (mrt6debug & DEBUG_PIM) 1732 log(LOG_DEBUG, 1733 "pim6_input[register], eip6: %s -> %s, " 1734 "eip6 plen %d\n", 1735 ip6_sprintf(&eip6->ip6_src), 1736 ip6_sprintf(&eip6->ip6_dst), 1737 ntohs(eip6->ip6_plen)); 1738#endif 1739 1740 /* verify the inner packet is destined to a mcast group */ 1741 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1742 ++pim6stat.pim6s_rcv_badregisters; 1743#ifdef MRT6DEBUG 1744 if (mrt6debug & DEBUG_PIM) 1745 log(LOG_DEBUG, 1746 "pim6_input: inner packet of register " 1747 "is not multicast %s\n", 1748 ip6_sprintf(&eip6->ip6_dst)); 1749#endif 1750 m_freem(m); 1751 return(IPPROTO_DONE); 1752 } 1753 1754 /* 1755 * make a copy of the whole header to pass to the daemon later. 1756 */ 1757 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1758 if (mcp == NULL) { 1759#ifdef MRT6DEBUG 1760 log(LOG_ERR, 1761 "pim6_input: pim register: " 1762 "could not copy register head\n"); 1763#endif 1764 m_freem(m); 1765 return(IPPROTO_DONE); 1766 } 1767 1768 /* 1769 * forward the inner ip6 packet; point m_data at the inner ip6. 1770 */ 1771 m_adj(m, off + PIM_MINLEN); 1772#ifdef MRT6DEBUG 1773 if (mrt6debug & DEBUG_PIM) { 1774 log(LOG_DEBUG, 1775 "pim6_input: forwarding decapsulated register: " 1776 "src %s, dst %s, mif %d\n", 1777 ip6_sprintf(&eip6->ip6_src), 1778 ip6_sprintf(&eip6->ip6_dst), 1779 reg_mif_num); 1780 } 1781#endif 1782 1783 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1784 dst.sin6_family, NULL); 1785 1786 /* prepare the register head to send to the mrouting daemon */ 1787 m = mcp; 1788 } 1789 1790 /* 1791 * Pass the PIM message up to the daemon; if it is a register message 1792 * pass the 'head' only up to the daemon. This includes the 1793 * encapsulator ip6 header, pim header, register header and the 1794 * encapsulated ip6 header. 1795 */ 1796 pim6_input_to_daemon: 1797 rip6_input(&m, offp, proto); 1798 return(IPPROTO_DONE); 1799} 1800