ip6_mroute.c revision 261218
1255570Strasz/*- 2255570Strasz * Copyright (C) 1998 WIDE Project. 3255570Strasz * All rights reserved. 4255570Strasz * 5255570Strasz * Redistribution and use in source and binary forms, with or without 6255570Strasz * modification, are permitted provided that the following conditions 7255570Strasz * are met: 8255570Strasz * 1. Redistributions of source code must retain the above copyright 9255570Strasz * notice, this list of conditions and the following disclaimer. 10255570Strasz * 2. Redistributions in binary form must reproduce the above copyright 11255570Strasz * notice, this list of conditions and the following disclaimer in the 12255570Strasz * documentation and/or other materials provided with the distribution. 13255570Strasz * 3. Neither the name of the project nor the names of its contributors 14255570Strasz * may be used to endorse or promote products derived from this software 15255570Strasz * without specific prior written permission. 16255570Strasz * 17255570Strasz * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18255570Strasz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19255570Strasz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20255570Strasz * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21255570Strasz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22255570Strasz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23255570Strasz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24255570Strasz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25255570Strasz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26255570Strasz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27255570Strasz * SUCH DAMAGE. 28255570Strasz * 29255570Strasz * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ 30255570Strasz */ 31270888Strasz 32270888Strasz/*- 33270888Strasz * Copyright (c) 1989 Stephen Deering 34255570Strasz * Copyright (c) 1992, 1993 35255570Strasz * The Regents of the University of California. All rights reserved. 36255570Strasz * 37255570Strasz * This code is derived from software contributed to Berkeley by 38255570Strasz * Stephen Deering of Stanford University. 39255570Strasz * 40255570Strasz * Redistribution and use in source and binary forms, with or without 41255570Strasz * modification, are permitted provided that the following conditions 42255570Strasz * are met: 43255570Strasz * 1. Redistributions of source code must retain the above copyright 44255570Strasz * notice, this list of conditions and the following disclaimer. 45255570Strasz * 2. Redistributions in binary form must reproduce the above copyright 46255570Strasz * notice, this list of conditions and the following disclaimer in the 47255570Strasz * documentation and/or other materials provided with the distribution. 48255570Strasz * 4. Neither the name of the University nor the names of its contributors 49255570Strasz * may be used to endorse or promote products derived from this software 50255570Strasz * without specific prior written permission. 51255570Strasz * 52255570Strasz * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53255570Strasz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54255570Strasz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55255570Strasz * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56255570Strasz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57255570Strasz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58255570Strasz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59255570Strasz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60255570Strasz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61255570Strasz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62255570Strasz * SUCH DAMAGE. 63255570Strasz * 64255570Strasz * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 65255570Strasz * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp 66276613Smav */ 67255570Strasz 68255570Strasz/* 69255570Strasz * IP multicast forwarding procedures 70255570Strasz * 71255570Strasz * Written by David Waitzman, BBN Labs, August 1988. 72255570Strasz * Modified by Steve Deering, Stanford, February 1989. 73255570Strasz * Modified by Mark J. Steiglitz, Stanford, May, 1991 74255570Strasz * Modified by Van Jacobson, LBL, January 1993 75255570Strasz * Modified by Ajit Thyagarajan, PARC, August 1993 76255570Strasz * Modified by Bill Fenner, PARC, April 1994 77255570Strasz * 78255570Strasz * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 79255570Strasz */ 80255570Strasz 81255570Strasz#include <sys/cdefs.h> 82255570Strasz__FBSDID("$FreeBSD: stable/10/sys/netinet6/ip6_mroute.c 261218 2014-01-28 00:30:17Z ae $"); 83255570Strasz 84255570Strasz#include "opt_inet6.h" 85255570Strasz#include "opt_kdtrace.h" 86255570Strasz 87255570Strasz#include <sys/param.h> 88255570Strasz#include <sys/callout.h> 89255570Strasz#include <sys/errno.h> 90255570Strasz#include <sys/kernel.h> 91255570Strasz#include <sys/lock.h> 92255570Strasz#include <sys/malloc.h> 93255570Strasz#include <sys/mbuf.h> 94255570Strasz#include <sys/module.h> 95255570Strasz#include <sys/domain.h> 96255570Strasz#include <sys/protosw.h> 97255570Strasz#include <sys/sdt.h> 98255570Strasz#include <sys/signalvar.h> 99255570Strasz#include <sys/socket.h> 100255570Strasz#include <sys/socketvar.h> 101255570Strasz#include <sys/sockio.h> 102255570Strasz#include <sys/sx.h> 103255570Strasz#include <sys/sysctl.h> 104255570Strasz#include <sys/syslog.h> 105255570Strasz#include <sys/systm.h> 106255570Strasz#include <sys/time.h> 107255570Strasz 108255570Strasz#include <net/if.h> 109255570Strasz#include <net/if_types.h> 110255570Strasz#include <net/raw_cb.h> 111255570Strasz#include <net/vnet.h> 112276613Smav 113255570Strasz#include <netinet/in.h> 114255570Strasz#include <netinet/in_var.h> 115255570Strasz#include <netinet/icmp6.h> 116255570Strasz#include <netinet/ip_encap.h> 117255570Strasz 118255570Strasz#include <netinet/ip6.h> 119255570Strasz#include <netinet/in_kdtrace.h> 120255570Strasz#include <netinet6/ip6_var.h> 121255570Strasz#include <netinet6/scope6_var.h> 122255570Strasz#include <netinet6/nd6.h> 123255570Strasz#include <netinet6/ip6_mroute.h> 124255570Strasz#include <netinet6/ip6protosw.h> 125255570Strasz#include <netinet6/pim6.h> 126255570Strasz#include <netinet6/pim6_var.h> 127255570Strasz 128255570Straszstatic MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 129255570Strasz 130255570Strasz/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 131255570Strasz#define M_HASCL(m) ((m)->m_flags & M_EXT) 132255570Strasz 133255570Straszstatic int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 134255570Straszstatic void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 135255570Straszstatic int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 136255570Straszstatic int set_pim6(int *); 137255570Straszstatic int socket_send(struct socket *, struct mbuf *, 138255570Strasz struct sockaddr_in6 *); 139255570Strasz 140255570Straszextern int in6_mcast_loop; 141255570Straszextern struct domain inet6domain; 142255570Strasz 143255570Straszstatic const struct encaptab *pim6_encap_cookie; 144255570Straszstatic const struct ip6protosw in6_pim_protosw = { 145255570Strasz .pr_type = SOCK_RAW, 146256193Strasz .pr_domain = &inet6domain, 147255570Strasz .pr_protocol = IPPROTO_PIM, 148255570Strasz .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 149255570Strasz .pr_input = pim6_input, 150255570Strasz .pr_output = rip6_output, 151255570Strasz .pr_ctloutput = rip6_ctloutput, 152255570Strasz .pr_usrreqs = &rip6_usrreqs 153255570Strasz}; 154255570Straszstatic int pim6_encapcheck(const struct mbuf *, int, int, void *); 155255570Strasz 156255570Straszstatic VNET_DEFINE(int, ip6_mrouter_ver) = 0; 157255570Strasz#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 158255570Strasz 159255570StraszSYSCTL_DECL(_net_inet6); 160255570StraszSYSCTL_DECL(_net_inet6_ip6); 161255570Straszstatic SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 162255570Strasz 163255570Straszstatic struct mrt6stat mrt6stat; 164255570StraszSYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 165255570Strasz &mrt6stat, mrt6stat, 166255570Strasz "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 167255570Strasz 168255570Strasz#define MRT6STAT_INC(name) mrt6stat.name += 1 169255570Strasz#define NO_RTE_FOUND 0x1 170255570Strasz#define RTE_FOUND 0x2 171255570Strasz 172255570Straszstatic struct mtx mrouter6_mtx; 173255570Strasz#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 174255570Strasz#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 175255570Strasz#define MROUTER6_LOCK_ASSERT() do { \ 176255570Strasz mtx_assert(&mrouter6_mtx, MA_OWNED); \ 177255570Strasz NET_ASSERT_GIANT(); \ 178255570Strasz} while (0) 179255570Strasz#define MROUTER6_LOCK_INIT() \ 180255570Strasz mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 181255570Strasz#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 182255570Strasz 183255570Straszstatic struct mf6c *mf6ctable[MF6CTBLSIZ]; 184255570StraszSYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 185255570Strasz &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 186255570Strasz "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 187255570Strasz "netinet6/ip6_mroute.h)"); 188255570Strasz 189255570Straszstatic struct mtx mfc6_mtx; 190255570Strasz#define MFC6_LOCK() mtx_lock(&mfc6_mtx) 191255570Strasz#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 192255570Strasz#define MFC6_LOCK_ASSERT() do { \ 193255570Strasz mtx_assert(&mfc6_mtx, MA_OWNED); \ 194255570Strasz NET_ASSERT_GIANT(); \ 195255570Strasz} while (0) 196255570Strasz#define MFC6_LOCK_INIT() \ 197255570Strasz mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 198255570Strasz#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 199255570Strasz 200255570Straszstatic u_char n6expire[MF6CTBLSIZ]; 201255570Strasz 202255570Straszstatic struct mif6 mif6table[MAXMIFS]; 203255570StraszSYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 204255570Strasz &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]", 205255570Strasz "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)"); 206255570Strasz 207255570Straszstatic struct mtx mif6_mtx; 208255570Strasz#define MIF6_LOCK() mtx_lock(&mif6_mtx) 209255570Strasz#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 210255570Strasz#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 211255570Strasz#define MIF6_LOCK_INIT() \ 212256194Strasz mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 213255570Strasz#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 214255570Strasz 215255570Strasz#ifdef MRT6DEBUG 216255570Straszstatic VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */ 217255570Strasz#define V_mrt6debug VNET(mrt6debug) 218255570Strasz#define DEBUG_MFC 0x02 219255570Strasz#define DEBUG_FORWARD 0x04 220255570Strasz#define DEBUG_EXPIRE 0x08 221#define DEBUG_XMIT 0x10 222#define DEBUG_REG 0x20 223#define DEBUG_PIM 0x40 224#define DEBUG_ERR 0x80 225#define DEBUG_ANY 0x7f 226#define MRT6_DLOG(m, fmt, ...) \ 227 if (V_mrt6debug & (m)) \ 228 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ 229 "%s: " fmt "\n", __func__, ##__VA_ARGS__) 230#else 231#define MRT6_DLOG(m, fmt, ...) 232#endif 233 234static void expire_upcalls(void *); 235#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 236#define UPCALL_EXPIRE 6 /* number of timeouts */ 237 238/* 239 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 240 */ 241 242/* 243 * 'Interfaces' associated with decapsulator (so we can tell 244 * packets that went through it from ones that get reflected 245 * by a broken gateway). Different from IPv4 register_if, 246 * these interfaces are linked into the system ifnet list, 247 * because per-interface IPv6 statistics are maintained in 248 * ifp->if_afdata. But it does not have any routes point 249 * to them. I.e., packets can't be sent this way. They 250 * only exist as a placeholder for multicast source 251 * verification. 252 */ 253static struct ifnet *multicast_register_if6; 254 255#define ENCAP_HOPS 64 256 257/* 258 * Private variables. 259 */ 260static mifi_t nummifs = 0; 261static mifi_t reg_mif_num = (mifi_t)-1; 262 263static struct pim6stat pim6stat; 264SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 265 &pim6stat, pim6stat, 266 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 267 268#define PIM6STAT_INC(name) pim6stat.name += 1 269static VNET_DEFINE(int, pim6); 270#define V_pim6 VNET(pim6) 271 272/* 273 * Hash function for a source, group entry 274 */ 275#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 276 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 277 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 278 (g).s6_addr32[2] ^ (g).s6_addr32[3]) 279 280/* 281 * Find a route for a given origin IPv6 address and Multicast group address. 282 */ 283#define MF6CFIND(o, g, rt) do { \ 284 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 285 rt = NULL; \ 286 MRT6STAT_INC(mrt6s_mfc_lookups); \ 287 while (_rt) { \ 288 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 289 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 290 (_rt->mf6c_stall == NULL)) { \ 291 rt = _rt; \ 292 break; \ 293 } \ 294 _rt = _rt->mf6c_next; \ 295 } \ 296 if (rt == NULL) { \ 297 MRT6STAT_INC(mrt6s_mfc_misses); \ 298 } \ 299} while (/*CONSTCOND*/ 0) 300 301/* 302 * Macros to compute elapsed time efficiently 303 * Borrowed from Van Jacobson's scheduling code 304 * XXX: replace with timersub() ? 305 */ 306#define TV_DELTA(a, b, delta) do { \ 307 int xxs; \ 308 \ 309 delta = (a).tv_usec - (b).tv_usec; \ 310 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 311 switch (xxs) { \ 312 case 2: \ 313 delta += 1000000; \ 314 /* FALLTHROUGH */ \ 315 case 1: \ 316 delta += 1000000; \ 317 break; \ 318 default: \ 319 delta += (1000000 * xxs); \ 320 } \ 321 } \ 322} while (/*CONSTCOND*/ 0) 323 324/* XXX: replace with timercmp(a, b, <) ? */ 325#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 326 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 327 328#ifdef UPCALL_TIMING 329#define UPCALL_MAX 50 330static u_long upcall_data[UPCALL_MAX + 1]; 331static void collate(); 332#endif /* UPCALL_TIMING */ 333 334static int ip6_mrouter_init(struct socket *, int, int); 335static int add_m6fc(struct mf6cctl *); 336static int add_m6if(struct mif6ctl *); 337static int del_m6fc(struct mf6cctl *); 338static int del_m6if(mifi_t *); 339static int del_m6if_locked(mifi_t *); 340static int get_mif6_cnt(struct sioc_mif_req6 *); 341static int get_sg_cnt(struct sioc_sg_req6 *); 342 343static struct callout expire_upcalls_ch; 344 345int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 346int X_ip6_mrouter_done(void); 347int X_ip6_mrouter_set(struct socket *, struct sockopt *); 348int X_ip6_mrouter_get(struct socket *, struct sockopt *); 349int X_mrt6_ioctl(u_long, caddr_t); 350 351/* 352 * Handle MRT setsockopt commands to modify the multicast routing tables. 353 */ 354int 355X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 356{ 357 int error = 0; 358 int optval; 359 struct mif6ctl mifc; 360 struct mf6cctl mfcc; 361 mifi_t mifi; 362 363 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 364 return (EACCES); 365 366 switch (sopt->sopt_name) { 367 case MRT6_INIT: 368#ifdef MRT6_OINIT 369 case MRT6_OINIT: 370#endif 371 error = sooptcopyin(sopt, &optval, sizeof(optval), 372 sizeof(optval)); 373 if (error) 374 break; 375 error = ip6_mrouter_init(so, optval, sopt->sopt_name); 376 break; 377 case MRT6_DONE: 378 error = X_ip6_mrouter_done(); 379 break; 380 case MRT6_ADD_MIF: 381 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 382 if (error) 383 break; 384 error = add_m6if(&mifc); 385 break; 386 case MRT6_ADD_MFC: 387 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 388 if (error) 389 break; 390 error = add_m6fc(&mfcc); 391 break; 392 case MRT6_DEL_MFC: 393 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 394 if (error) 395 break; 396 error = del_m6fc(&mfcc); 397 break; 398 case MRT6_DEL_MIF: 399 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 400 if (error) 401 break; 402 error = del_m6if(&mifi); 403 break; 404 case MRT6_PIM: 405 error = sooptcopyin(sopt, &optval, sizeof(optval), 406 sizeof(optval)); 407 if (error) 408 break; 409 error = set_pim6(&optval); 410 break; 411 default: 412 error = EOPNOTSUPP; 413 break; 414 } 415 416 return (error); 417} 418 419/* 420 * Handle MRT getsockopt commands 421 */ 422int 423X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 424{ 425 int error = 0; 426 427 if (so != V_ip6_mrouter) 428 return (EACCES); 429 430 switch (sopt->sopt_name) { 431 case MRT6_PIM: 432 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 433 break; 434 } 435 return (error); 436} 437 438/* 439 * Handle ioctl commands to obtain information from the cache 440 */ 441int 442X_mrt6_ioctl(u_long cmd, caddr_t data) 443{ 444 int ret; 445 446 ret = EINVAL; 447 448 switch (cmd) { 449 case SIOCGETSGCNT_IN6: 450 ret = get_sg_cnt((struct sioc_sg_req6 *)data); 451 break; 452 453 case SIOCGETMIFCNT_IN6: 454 ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 455 break; 456 457 default: 458 break; 459 } 460 461 return (ret); 462} 463 464/* 465 * returns the packet, byte, rpf-failure count for the source group provided 466 */ 467static int 468get_sg_cnt(struct sioc_sg_req6 *req) 469{ 470 struct mf6c *rt; 471 int ret; 472 473 ret = 0; 474 475 MFC6_LOCK(); 476 477 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 478 if (rt == NULL) { 479 ret = ESRCH; 480 } else { 481 req->pktcnt = rt->mf6c_pkt_cnt; 482 req->bytecnt = rt->mf6c_byte_cnt; 483 req->wrong_if = rt->mf6c_wrong_if; 484 } 485 486 MFC6_UNLOCK(); 487 488 return (ret); 489} 490 491/* 492 * returns the input and output packet and byte counts on the mif provided 493 */ 494static int 495get_mif6_cnt(struct sioc_mif_req6 *req) 496{ 497 mifi_t mifi; 498 int ret; 499 500 ret = 0; 501 mifi = req->mifi; 502 503 MIF6_LOCK(); 504 505 if (mifi >= nummifs) { 506 ret = EINVAL; 507 } else { 508 req->icount = mif6table[mifi].m6_pkt_in; 509 req->ocount = mif6table[mifi].m6_pkt_out; 510 req->ibytes = mif6table[mifi].m6_bytes_in; 511 req->obytes = mif6table[mifi].m6_bytes_out; 512 } 513 514 MIF6_UNLOCK(); 515 516 return (ret); 517} 518 519static int 520set_pim6(int *i) 521{ 522 if ((*i != 1) && (*i != 0)) 523 return (EINVAL); 524 525 V_pim6 = *i; 526 527 return (0); 528} 529 530/* 531 * Enable multicast routing 532 */ 533static int 534ip6_mrouter_init(struct socket *so, int v, int cmd) 535{ 536 537 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d", 538 so->so_type, so->so_proto->pr_protocol); 539 540 if (so->so_type != SOCK_RAW || 541 so->so_proto->pr_protocol != IPPROTO_ICMPV6) 542 return (EOPNOTSUPP); 543 544 if (v != 1) 545 return (ENOPROTOOPT); 546 547 MROUTER6_LOCK(); 548 549 if (V_ip6_mrouter != NULL) { 550 MROUTER6_UNLOCK(); 551 return (EADDRINUSE); 552 } 553 554 V_ip6_mrouter = so; 555 V_ip6_mrouter_ver = cmd; 556 557 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 558 bzero((caddr_t)n6expire, sizeof(n6expire)); 559 560 V_pim6 = 0;/* used for stubbing out/in pim stuff */ 561 562 callout_init(&expire_upcalls_ch, 0); 563 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 564 expire_upcalls, NULL); 565 566 MROUTER6_UNLOCK(); 567 MRT6_DLOG(DEBUG_ANY, "finished"); 568 569 return (0); 570} 571 572/* 573 * Disable IPv6 multicast forwarding. 574 */ 575int 576X_ip6_mrouter_done(void) 577{ 578 mifi_t mifi; 579 u_long i; 580 struct mf6c *rt; 581 struct rtdetq *rte; 582 583 MROUTER6_LOCK(); 584 585 if (V_ip6_mrouter == NULL) { 586 MROUTER6_UNLOCK(); 587 return (EINVAL); 588 } 589 590 /* 591 * For each phyint in use, disable promiscuous reception of all IPv6 592 * multicasts. 593 */ 594 for (mifi = 0; mifi < nummifs; mifi++) { 595 if (mif6table[mifi].m6_ifp && 596 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 597 if_allmulti(mif6table[mifi].m6_ifp, 0); 598 } 599 } 600 bzero((caddr_t)mif6table, sizeof(mif6table)); 601 nummifs = 0; 602 603 V_pim6 = 0; /* used to stub out/in pim specific code */ 604 605 callout_stop(&expire_upcalls_ch); 606 607 /* 608 * Free all multicast forwarding cache entries. 609 */ 610 MFC6_LOCK(); 611 for (i = 0; i < MF6CTBLSIZ; i++) { 612 rt = mf6ctable[i]; 613 while (rt) { 614 struct mf6c *frt; 615 616 for (rte = rt->mf6c_stall; rte != NULL; ) { 617 struct rtdetq *n = rte->next; 618 619 m_freem(rte->m); 620 free(rte, M_MRTABLE6); 621 rte = n; 622 } 623 frt = rt; 624 rt = rt->mf6c_next; 625 free(frt, M_MRTABLE6); 626 } 627 } 628 bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 629 MFC6_UNLOCK(); 630 631 /* 632 * Reset register interface 633 */ 634 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 635 if_detach(multicast_register_if6); 636 if_free(multicast_register_if6); 637 reg_mif_num = (mifi_t)-1; 638 multicast_register_if6 = NULL; 639 } 640 641 V_ip6_mrouter = NULL; 642 V_ip6_mrouter_ver = 0; 643 644 MROUTER6_UNLOCK(); 645 MRT6_DLOG(DEBUG_ANY, "finished"); 646 647 return (0); 648} 649 650static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 651 652/* 653 * Add a mif to the mif table 654 */ 655static int 656add_m6if(struct mif6ctl *mifcp) 657{ 658 struct mif6 *mifp; 659 struct ifnet *ifp; 660 int error; 661 662 MIF6_LOCK(); 663 664 if (mifcp->mif6c_mifi >= MAXMIFS) { 665 MIF6_UNLOCK(); 666 return (EINVAL); 667 } 668 mifp = mif6table + mifcp->mif6c_mifi; 669 if (mifp->m6_ifp != NULL) { 670 MIF6_UNLOCK(); 671 return (EADDRINUSE); /* XXX: is it appropriate? */ 672 } 673 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 674 MIF6_UNLOCK(); 675 return (ENXIO); 676 } 677 678 ifp = ifnet_byindex(mifcp->mif6c_pifi); 679 680 if (mifcp->mif6c_flags & MIFF_REGISTER) { 681 if (reg_mif_num == (mifi_t)-1) { 682 ifp = if_alloc(IFT_OTHER); 683 684 if_initname(ifp, "register_mif", 0); 685 ifp->if_flags |= IFF_LOOPBACK; 686 if_attach(ifp); 687 multicast_register_if6 = ifp; 688 reg_mif_num = mifcp->mif6c_mifi; 689 /* 690 * it is impossible to guess the ifindex of the 691 * register interface. So mif6c_pifi is automatically 692 * calculated. 693 */ 694 mifcp->mif6c_pifi = ifp->if_index; 695 } else { 696 ifp = multicast_register_if6; 697 } 698 } else { 699 /* Make sure the interface supports multicast */ 700 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 701 MIF6_UNLOCK(); 702 return (EOPNOTSUPP); 703 } 704 705 error = if_allmulti(ifp, 1); 706 if (error) { 707 MIF6_UNLOCK(); 708 return (error); 709 } 710 } 711 712 mifp->m6_flags = mifcp->mif6c_flags; 713 mifp->m6_ifp = ifp; 714 715 /* initialize per mif pkt counters */ 716 mifp->m6_pkt_in = 0; 717 mifp->m6_pkt_out = 0; 718 mifp->m6_bytes_in = 0; 719 mifp->m6_bytes_out = 0; 720 721 /* Adjust nummifs up if the mifi is higher than nummifs */ 722 if (nummifs <= mifcp->mif6c_mifi) 723 nummifs = mifcp->mif6c_mifi + 1; 724 725 MIF6_UNLOCK(); 726 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, 727 if_name(ifp)); 728 729 return (0); 730} 731 732/* 733 * Delete a mif from the mif table 734 */ 735static int 736del_m6if_locked(mifi_t *mifip) 737{ 738 struct mif6 *mifp = mif6table + *mifip; 739 mifi_t mifi; 740 struct ifnet *ifp; 741 742 MIF6_LOCK_ASSERT(); 743 744 if (*mifip >= nummifs) 745 return (EINVAL); 746 if (mifp->m6_ifp == NULL) 747 return (EINVAL); 748 749 if (!(mifp->m6_flags & MIFF_REGISTER)) { 750 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 751 ifp = mifp->m6_ifp; 752 if_allmulti(ifp, 0); 753 } else { 754 if (reg_mif_num != (mifi_t)-1 && 755 multicast_register_if6 != NULL) { 756 if_detach(multicast_register_if6); 757 if_free(multicast_register_if6); 758 reg_mif_num = (mifi_t)-1; 759 multicast_register_if6 = NULL; 760 } 761 } 762 763 bzero((caddr_t)mifp, sizeof(*mifp)); 764 765 /* Adjust nummifs down */ 766 for (mifi = nummifs; mifi > 0; mifi--) 767 if (mif6table[mifi - 1].m6_ifp) 768 break; 769 nummifs = mifi; 770 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs); 771 772 return (0); 773} 774 775static int 776del_m6if(mifi_t *mifip) 777{ 778 int cc; 779 780 MIF6_LOCK(); 781 cc = del_m6if_locked(mifip); 782 MIF6_UNLOCK(); 783 784 return (cc); 785} 786 787/* 788 * Add an mfc entry 789 */ 790static int 791add_m6fc(struct mf6cctl *mfccp) 792{ 793 struct mf6c *rt; 794 u_long hash; 795 struct rtdetq *rte; 796 u_short nstl; 797 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 798 799 MFC6_LOCK(); 800 801 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 802 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 803 804 /* If an entry already exists, just update the fields */ 805 if (rt) { 806 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", 807 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 808 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 809 mfccp->mf6cc_parent); 810 811 rt->mf6c_parent = mfccp->mf6cc_parent; 812 rt->mf6c_ifset = mfccp->mf6cc_ifset; 813 814 MFC6_UNLOCK(); 815 return (0); 816 } 817 818 /* 819 * Find the entry for which the upcall was made and update 820 */ 821 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 822 mfccp->mf6cc_mcastgrp.sin6_addr); 823 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 824 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 825 &mfccp->mf6cc_origin.sin6_addr) && 826 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 827 &mfccp->mf6cc_mcastgrp.sin6_addr) && 828 (rt->mf6c_stall != NULL)) { 829 830 if (nstl++) 831 log(LOG_ERR, 832 "add_m6fc: %s o %s g %s p %x dbx %p\n", 833 "multiple kernel entries", 834 ip6_sprintf(ip6bufo, 835 &mfccp->mf6cc_origin.sin6_addr), 836 ip6_sprintf(ip6bufg, 837 &mfccp->mf6cc_mcastgrp.sin6_addr), 838 mfccp->mf6cc_parent, rt->mf6c_stall); 839 840 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", 841 ip6_sprintf(ip6bufo, 842 &mfccp->mf6cc_origin.sin6_addr), 843 ip6_sprintf(ip6bufg, 844 &mfccp->mf6cc_mcastgrp.sin6_addr), 845 mfccp->mf6cc_parent, rt->mf6c_stall); 846 847 rt->mf6c_origin = mfccp->mf6cc_origin; 848 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 849 rt->mf6c_parent = mfccp->mf6cc_parent; 850 rt->mf6c_ifset = mfccp->mf6cc_ifset; 851 /* initialize pkt counters per src-grp */ 852 rt->mf6c_pkt_cnt = 0; 853 rt->mf6c_byte_cnt = 0; 854 rt->mf6c_wrong_if = 0; 855 856 rt->mf6c_expire = 0; /* Don't clean this guy up */ 857 n6expire[hash]--; 858 859 /* free packets Qed at the end of this entry */ 860 for (rte = rt->mf6c_stall; rte != NULL; ) { 861 struct rtdetq *n = rte->next; 862 ip6_mdq(rte->m, rte->ifp, rt); 863 m_freem(rte->m); 864#ifdef UPCALL_TIMING 865 collate(&(rte->t)); 866#endif /* UPCALL_TIMING */ 867 free(rte, M_MRTABLE6); 868 rte = n; 869 } 870 rt->mf6c_stall = NULL; 871 } 872 } 873 874 /* 875 * It is possible that an entry is being inserted without an upcall 876 */ 877 if (nstl == 0) { 878 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, 879 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 880 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 881 mfccp->mf6cc_parent); 882 883 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 884 885 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 886 &mfccp->mf6cc_origin.sin6_addr)&& 887 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 888 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 889 890 rt->mf6c_origin = mfccp->mf6cc_origin; 891 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 892 rt->mf6c_parent = mfccp->mf6cc_parent; 893 rt->mf6c_ifset = mfccp->mf6cc_ifset; 894 /* initialize pkt counters per src-grp */ 895 rt->mf6c_pkt_cnt = 0; 896 rt->mf6c_byte_cnt = 0; 897 rt->mf6c_wrong_if = 0; 898 899 if (rt->mf6c_expire) 900 n6expire[hash]--; 901 rt->mf6c_expire = 0; 902 } 903 } 904 if (rt == NULL) { 905 /* no upcall, so make a new entry */ 906 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 907 M_NOWAIT); 908 if (rt == NULL) { 909 MFC6_UNLOCK(); 910 return (ENOBUFS); 911 } 912 913 /* insert new entry at head of hash chain */ 914 rt->mf6c_origin = mfccp->mf6cc_origin; 915 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 916 rt->mf6c_parent = mfccp->mf6cc_parent; 917 rt->mf6c_ifset = mfccp->mf6cc_ifset; 918 /* initialize pkt counters per src-grp */ 919 rt->mf6c_pkt_cnt = 0; 920 rt->mf6c_byte_cnt = 0; 921 rt->mf6c_wrong_if = 0; 922 rt->mf6c_expire = 0; 923 rt->mf6c_stall = NULL; 924 925 /* link into table */ 926 rt->mf6c_next = mf6ctable[hash]; 927 mf6ctable[hash] = rt; 928 } 929 } 930 931 MFC6_UNLOCK(); 932 return (0); 933} 934 935#ifdef UPCALL_TIMING 936/* 937 * collect delay statistics on the upcalls 938 */ 939static void 940collate(struct timeval *t) 941{ 942 u_long d; 943 struct timeval tp; 944 u_long delta; 945 946 GET_TIME(tp); 947 948 if (TV_LT(*t, tp)) 949 { 950 TV_DELTA(tp, *t, delta); 951 952 d = delta >> 10; 953 if (d > UPCALL_MAX) 954 d = UPCALL_MAX; 955 956 ++upcall_data[d]; 957 } 958} 959#endif /* UPCALL_TIMING */ 960 961/* 962 * Delete an mfc entry 963 */ 964static int 965del_m6fc(struct mf6cctl *mfccp) 966{ 967#ifdef MRT6DEBUG 968 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 969#endif 970 struct sockaddr_in6 origin; 971 struct sockaddr_in6 mcastgrp; 972 struct mf6c *rt; 973 struct mf6c **nptr; 974 u_long hash; 975 976 origin = mfccp->mf6cc_origin; 977 mcastgrp = mfccp->mf6cc_mcastgrp; 978 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 979 980 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", 981 ip6_sprintf(ip6bufo, &origin.sin6_addr), 982 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 983 984 MFC6_LOCK(); 985 986 nptr = &mf6ctable[hash]; 987 while ((rt = *nptr) != NULL) { 988 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 989 &rt->mf6c_origin.sin6_addr) && 990 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 991 &rt->mf6c_mcastgrp.sin6_addr) && 992 rt->mf6c_stall == NULL) 993 break; 994 995 nptr = &rt->mf6c_next; 996 } 997 if (rt == NULL) { 998 MFC6_UNLOCK(); 999 return (EADDRNOTAVAIL); 1000 } 1001 1002 *nptr = rt->mf6c_next; 1003 free(rt, M_MRTABLE6); 1004 1005 MFC6_UNLOCK(); 1006 1007 return (0); 1008} 1009 1010static int 1011socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1012{ 1013 1014 if (s) { 1015 if (sbappendaddr(&s->so_rcv, 1016 (struct sockaddr *)src, 1017 mm, (struct mbuf *)0) != 0) { 1018 sorwakeup(s); 1019 return (0); 1020 } 1021 } 1022 m_freem(mm); 1023 return (-1); 1024} 1025 1026/* 1027 * IPv6 multicast forwarding function. This function assumes that the packet 1028 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1029 * pointed to by "ifp", and the packet is to be relayed to other networks 1030 * that have members of the packet's destination IPv6 multicast group. 1031 * 1032 * The packet is returned unscathed to the caller, unless it is 1033 * erroneous, in which case a non-zero return value tells the caller to 1034 * discard it. 1035 * 1036 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1037 * this function is called in the originating context (i.e., not when 1038 * forwarding a packet from other node). ip6_output(), which is currently the 1039 * only function that calls this function is called in the originating context, 1040 * explicitly ensures this condition. It is caller's responsibility to ensure 1041 * that if this function is called from somewhere else in the originating 1042 * context in the future. 1043 */ 1044int 1045X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1046{ 1047 struct rtdetq *rte; 1048 struct mbuf *mb0; 1049 struct mf6c *rt; 1050 struct mif6 *mifp; 1051 struct mbuf *mm; 1052 u_long hash; 1053 mifi_t mifi; 1054 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1055#ifdef UPCALL_TIMING 1056 struct timeval tp; 1057 1058 GET_TIME(tp); 1059#endif /* UPCALL_TIMING */ 1060 1061 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", 1062 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1063 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); 1064 1065 /* 1066 * Don't forward a packet with Hop limit of zero or one, 1067 * or a packet destined to a local-only group. 1068 */ 1069 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1070 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1071 return (0); 1072 ip6->ip6_hlim--; 1073 1074 /* 1075 * Source address check: do not forward packets with unspecified 1076 * source. It was discussed in July 2000, on ipngwg mailing list. 1077 * This is rather more serious than unicast cases, because some 1078 * MLD packets can be sent with the unspecified source address 1079 * (although such packets must normally set 1 to the hop limit field). 1080 */ 1081 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1082 IP6STAT_INC(ip6s_cantforward); 1083 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) { 1084 V_ip6_log_time = time_uptime; 1085 log(LOG_DEBUG, 1086 "cannot forward " 1087 "from %s to %s nxt %d received on %s\n", 1088 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1089 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1090 ip6->ip6_nxt, 1091 if_name(m->m_pkthdr.rcvif)); 1092 } 1093 return (0); 1094 } 1095 1096 MFC6_LOCK(); 1097 1098 /* 1099 * Determine forwarding mifs from the forwarding cache table 1100 */ 1101 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1102 1103 /* Entry exists, so forward if necessary */ 1104 if (rt) { 1105 MFC6_UNLOCK(); 1106 return (ip6_mdq(m, ifp, rt)); 1107 } 1108 1109 /* 1110 * If we don't have a route for packet's origin, 1111 * Make a copy of the packet & send message to routing daemon. 1112 */ 1113 MRT6STAT_INC(mrt6s_no_route); 1114 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", 1115 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1116 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1117 1118 /* 1119 * Allocate mbufs early so that we don't do extra work if we 1120 * are just going to fail anyway. 1121 */ 1122 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); 1123 if (rte == NULL) { 1124 MFC6_UNLOCK(); 1125 return (ENOBUFS); 1126 } 1127 mb0 = m_copy(m, 0, M_COPYALL); 1128 /* 1129 * Pullup packet header if needed before storing it, 1130 * as other references may modify it in the meantime. 1131 */ 1132 if (mb0 && (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1133 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1134 if (mb0 == NULL) { 1135 free(rte, M_MRTABLE6); 1136 MFC6_UNLOCK(); 1137 return (ENOBUFS); 1138 } 1139 1140 /* is there an upcall waiting for this packet? */ 1141 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1142 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1143 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1144 &rt->mf6c_origin.sin6_addr) && 1145 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1146 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) 1147 break; 1148 } 1149 1150 if (rt == NULL) { 1151 struct mrt6msg *im; 1152#ifdef MRT6_OINIT 1153 struct omrt6msg *oim; 1154#endif 1155 /* no upcall, so make a new entry */ 1156 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); 1157 if (rt == NULL) { 1158 free(rte, M_MRTABLE6); 1159 m_freem(mb0); 1160 MFC6_UNLOCK(); 1161 return (ENOBUFS); 1162 } 1163 /* 1164 * Make a copy of the header to send to the user 1165 * level process 1166 */ 1167 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1168 if (mm == NULL) { 1169 free(rte, M_MRTABLE6); 1170 m_freem(mb0); 1171 free(rt, M_MRTABLE6); 1172 MFC6_UNLOCK(); 1173 return (ENOBUFS); 1174 } 1175 1176 /* 1177 * Send message to routing daemon 1178 */ 1179 sin6.sin6_addr = ip6->ip6_src; 1180 im = NULL; 1181#ifdef MRT6_OINIT 1182 oim = NULL; 1183#endif 1184 switch (V_ip6_mrouter_ver) { 1185#ifdef MRT6_OINIT 1186 case MRT6_OINIT: 1187 oim = mtod(mm, struct omrt6msg *); 1188 oim->im6_msgtype = MRT6MSG_NOCACHE; 1189 oim->im6_mbz = 0; 1190 break; 1191#endif 1192 case MRT6_INIT: 1193 im = mtod(mm, struct mrt6msg *); 1194 im->im6_msgtype = MRT6MSG_NOCACHE; 1195 im->im6_mbz = 0; 1196 break; 1197 default: 1198 free(rte, M_MRTABLE6); 1199 m_freem(mb0); 1200 free(rt, M_MRTABLE6); 1201 MFC6_UNLOCK(); 1202 return (EINVAL); 1203 } 1204 1205 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); 1206 for (mifp = mif6table, mifi = 0; 1207 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) 1208 ; 1209 1210 switch (V_ip6_mrouter_ver) { 1211#ifdef MRT6_OINIT 1212 case MRT6_OINIT: 1213 oim->im6_mif = mifi; 1214 break; 1215#endif 1216 case MRT6_INIT: 1217 im->im6_mif = mifi; 1218 break; 1219 } 1220 1221 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1222 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1223 "socket queue full\n"); 1224 MRT6STAT_INC(mrt6s_upq_sockfull); 1225 free(rte, M_MRTABLE6); 1226 m_freem(mb0); 1227 free(rt, M_MRTABLE6); 1228 MFC6_UNLOCK(); 1229 return (ENOBUFS); 1230 } 1231 1232 MRT6STAT_INC(mrt6s_upcalls); 1233 1234 /* insert new entry at head of hash chain */ 1235 bzero(rt, sizeof(*rt)); 1236 rt->mf6c_origin.sin6_family = AF_INET6; 1237 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1238 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1239 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1240 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1241 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1242 rt->mf6c_expire = UPCALL_EXPIRE; 1243 n6expire[hash]++; 1244 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1245 1246 /* link into table */ 1247 rt->mf6c_next = mf6ctable[hash]; 1248 mf6ctable[hash] = rt; 1249 /* Add this entry to the end of the queue */ 1250 rt->mf6c_stall = rte; 1251 } else { 1252 /* determine if q has overflowed */ 1253 struct rtdetq **p; 1254 int npkts = 0; 1255 1256 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1257 if (++npkts > MAX_UPQ6) { 1258 MRT6STAT_INC(mrt6s_upq_ovflw); 1259 free(rte, M_MRTABLE6); 1260 m_freem(mb0); 1261 MFC6_UNLOCK(); 1262 return (0); 1263 } 1264 1265 /* Add this entry to the end of the queue */ 1266 *p = rte; 1267 } 1268 1269 rte->next = NULL; 1270 rte->m = mb0; 1271 rte->ifp = ifp; 1272#ifdef UPCALL_TIMING 1273 rte->t = tp; 1274#endif /* UPCALL_TIMING */ 1275 1276 MFC6_UNLOCK(); 1277 1278 return (0); 1279} 1280 1281/* 1282 * Clean up cache entries if upcalls are not serviced 1283 * Call from the Slow Timeout mechanism, every half second. 1284 */ 1285static void 1286expire_upcalls(void *unused) 1287{ 1288#ifdef MRT6DEBUG 1289 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1290#endif 1291 struct rtdetq *rte; 1292 struct mf6c *mfc, **nptr; 1293 u_long i; 1294 1295 MFC6_LOCK(); 1296 for (i = 0; i < MF6CTBLSIZ; i++) { 1297 if (n6expire[i] == 0) 1298 continue; 1299 nptr = &mf6ctable[i]; 1300 while ((mfc = *nptr) != NULL) { 1301 rte = mfc->mf6c_stall; 1302 /* 1303 * Skip real cache entries 1304 * Make sure it wasn't marked to not expire (shouldn't happen) 1305 * If it expires now 1306 */ 1307 if (rte != NULL && 1308 mfc->mf6c_expire != 0 && 1309 --mfc->mf6c_expire == 0) { 1310 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", 1311 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1312 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1313 /* 1314 * drop all the packets 1315 * free the mbuf with the pkt, if, timing info 1316 */ 1317 do { 1318 struct rtdetq *n = rte->next; 1319 m_freem(rte->m); 1320 free(rte, M_MRTABLE6); 1321 rte = n; 1322 } while (rte != NULL); 1323 MRT6STAT_INC(mrt6s_cache_cleanups); 1324 n6expire[i]--; 1325 1326 *nptr = mfc->mf6c_next; 1327 free(mfc, M_MRTABLE6); 1328 } else { 1329 nptr = &mfc->mf6c_next; 1330 } 1331 } 1332 } 1333 MFC6_UNLOCK(); 1334 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1335 expire_upcalls, NULL); 1336} 1337 1338/* 1339 * Packet forwarding routine once entry in the cache is made 1340 */ 1341static int 1342ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1343{ 1344 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1345 mifi_t mifi, iif; 1346 struct mif6 *mifp; 1347 int plen = m->m_pkthdr.len; 1348 struct in6_addr src0, dst0; /* copies for local work */ 1349 u_int32_t iszone, idzone, oszone, odzone; 1350 int error = 0; 1351 1352/* 1353 * Macro to send packet on mif. Since RSVP packets don't get counted on 1354 * input, they shouldn't get counted on output, so statistics keeping is 1355 * separate. 1356 */ 1357 1358#define MC6_SEND(ip6, mifp, m) do { \ 1359 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1360 register_send((ip6), (mifp), (m)); \ 1361 else \ 1362 phyint_send((ip6), (mifp), (m)); \ 1363} while (/*CONSTCOND*/ 0) 1364 1365 /* 1366 * Don't forward if it didn't arrive from the parent mif 1367 * for its origin. 1368 */ 1369 mifi = rt->mf6c_parent; 1370 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1371 /* came in the wrong interface */ 1372 MRT6_DLOG(DEBUG_FORWARD, 1373 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, 1374 mifi, mif6table[mifi].m6_ifp->if_index); 1375 MRT6STAT_INC(mrt6s_wrong_if); 1376 rt->mf6c_wrong_if++; 1377 /* 1378 * If we are doing PIM processing, and we are forwarding 1379 * packets on this interface, send a message to the 1380 * routing daemon. 1381 */ 1382 /* have to make sure this is a valid mif */ 1383 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1384 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1385 /* 1386 * Check the M_LOOP flag to avoid an 1387 * unnecessary PIM assert. 1388 * XXX: M_LOOP is an ad-hoc hack... 1389 */ 1390 static struct sockaddr_in6 sin6 = 1391 { sizeof(sin6), AF_INET6 }; 1392 1393 struct mbuf *mm; 1394 struct mrt6msg *im; 1395#ifdef MRT6_OINIT 1396 struct omrt6msg *oim; 1397#endif 1398 1399 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1400 if (mm && 1401 (M_HASCL(mm) || 1402 mm->m_len < sizeof(struct ip6_hdr))) 1403 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1404 if (mm == NULL) 1405 return (ENOBUFS); 1406 1407#ifdef MRT6_OINIT 1408 oim = NULL; 1409#endif 1410 im = NULL; 1411 switch (V_ip6_mrouter_ver) { 1412#ifdef MRT6_OINIT 1413 case MRT6_OINIT: 1414 oim = mtod(mm, struct omrt6msg *); 1415 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1416 oim->im6_mbz = 0; 1417 break; 1418#endif 1419 case MRT6_INIT: 1420 im = mtod(mm, struct mrt6msg *); 1421 im->im6_msgtype = MRT6MSG_WRONGMIF; 1422 im->im6_mbz = 0; 1423 break; 1424 default: 1425 m_freem(mm); 1426 return (EINVAL); 1427 } 1428 1429 for (mifp = mif6table, iif = 0; 1430 iif < nummifs && mifp && 1431 mifp->m6_ifp != ifp; 1432 mifp++, iif++) 1433 ; 1434 1435 switch (V_ip6_mrouter_ver) { 1436#ifdef MRT6_OINIT 1437 case MRT6_OINIT: 1438 oim->im6_mif = iif; 1439 sin6.sin6_addr = oim->im6_src; 1440 break; 1441#endif 1442 case MRT6_INIT: 1443 im->im6_mif = iif; 1444 sin6.sin6_addr = im->im6_src; 1445 break; 1446 } 1447 1448 MRT6STAT_INC(mrt6s_upcalls); 1449 1450 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1451 MRT6_DLOG(DEBUG_ANY, 1452 "ip6_mrouter socket queue full"); 1453 MRT6STAT_INC(mrt6s_upq_sockfull); 1454 return (ENOBUFS); 1455 } /* if socket Q full */ 1456 } /* if PIM */ 1457 return (0); 1458 } /* if wrong iif */ 1459 1460 /* If I sourced this packet, it counts as output, else it was input. */ 1461 if (m->m_pkthdr.rcvif == NULL) { 1462 /* XXX: is rcvif really NULL when output?? */ 1463 mif6table[mifi].m6_pkt_out++; 1464 mif6table[mifi].m6_bytes_out += plen; 1465 } else { 1466 mif6table[mifi].m6_pkt_in++; 1467 mif6table[mifi].m6_bytes_in += plen; 1468 } 1469 rt->mf6c_pkt_cnt++; 1470 rt->mf6c_byte_cnt += plen; 1471 1472 /* 1473 * For each mif, forward a copy of the packet if there are group 1474 * members downstream on the interface. 1475 */ 1476 src0 = ip6->ip6_src; 1477 dst0 = ip6->ip6_dst; 1478 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1479 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1480 IP6STAT_INC(ip6s_badscope); 1481 return (error); 1482 } 1483 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1484 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1485 /* 1486 * check if the outgoing packet is going to break 1487 * a scope boundary. 1488 * XXX For packets through PIM register tunnel 1489 * interface, we believe a routing daemon. 1490 */ 1491 if (!(mif6table[rt->mf6c_parent].m6_flags & 1492 MIFF_REGISTER) && 1493 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1494 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1495 &oszone) || 1496 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1497 &odzone) || 1498 iszone != oszone || 1499 idzone != odzone) { 1500 IP6STAT_INC(ip6s_badscope); 1501 continue; 1502 } 1503 } 1504 1505 mifp->m6_pkt_out++; 1506 mifp->m6_bytes_out += plen; 1507 MC6_SEND(ip6, mifp, m); 1508 } 1509 } 1510 return (0); 1511} 1512 1513static void 1514phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1515{ 1516#ifdef MRT6DEBUG 1517 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1518#endif 1519 struct mbuf *mb_copy; 1520 struct ifnet *ifp = mifp->m6_ifp; 1521 int error = 0; 1522 u_long linkmtu; 1523 1524 /* 1525 * Make a new reference to the packet; make sure that 1526 * the IPv6 header is actually copied, not just referenced, 1527 * so that ip6_output() only scribbles on the copy. 1528 */ 1529 mb_copy = m_copy(m, 0, M_COPYALL); 1530 if (mb_copy && 1531 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1532 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1533 if (mb_copy == NULL) { 1534 return; 1535 } 1536 /* set MCAST flag to the outgoing packet */ 1537 mb_copy->m_flags |= M_MCAST; 1538 1539 /* 1540 * If we sourced the packet, call ip6_output since we may devide 1541 * the packet into fragments when the packet is too big for the 1542 * outgoing interface. 1543 * Otherwise, we can simply send the packet to the interface 1544 * sending queue. 1545 */ 1546 if (m->m_pkthdr.rcvif == NULL) { 1547 struct ip6_moptions im6o; 1548 1549 im6o.im6o_multicast_ifp = ifp; 1550 /* XXX: ip6_output will override ip6->ip6_hlim */ 1551 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1552 im6o.im6o_multicast_loop = 1; 1553 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1554 NULL, NULL); 1555 1556 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1557 (uint16_t)(mifp - mif6table), error); 1558 return; 1559 } 1560 1561 /* 1562 * If configured to loop back multicasts by default, 1563 * loop back a copy now. 1564 */ 1565 if (in6_mcast_loop) { 1566 struct sockaddr_in6 dst6; 1567 1568 bzero(&dst6, sizeof(dst6)); 1569 dst6.sin6_len = sizeof(struct sockaddr_in6); 1570 dst6.sin6_family = AF_INET6; 1571 dst6.sin6_addr = ip6->ip6_dst; 1572 ip6_mloopback(ifp, m, &dst6); 1573 } 1574 1575 /* 1576 * Put the packet into the sending queue of the outgoing interface 1577 * if it would fit in the MTU of the interface. 1578 */ 1579 linkmtu = IN6_LINKMTU(ifp); 1580 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1581 struct sockaddr_in6 dst6; 1582 1583 bzero(&dst6, sizeof(dst6)); 1584 dst6.sin6_len = sizeof(struct sockaddr_in6); 1585 dst6.sin6_family = AF_INET6; 1586 dst6.sin6_addr = ip6->ip6_dst; 1587 1588 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); 1589 /* 1590 * We just call if_output instead of nd6_output here, since 1591 * we need no ND for a multicast forwarded packet...right? 1592 */ 1593 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1594 error = (*ifp->if_output)(ifp, mb_copy, 1595 (struct sockaddr *)&dst6, NULL); 1596 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", 1597 (uint16_t)(mifp - mif6table), error); 1598 } else { 1599 /* 1600 * pMTU discovery is intentionally disabled by default, since 1601 * various router may notify pMTU in multicast, which can be 1602 * a DDoS to a router 1603 */ 1604 if (V_ip6_mcast_pmtu) 1605 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1606 else { 1607 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " 1608 "g %s size %d (discarded)", if_name(ifp), 1609 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1610 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1611 mb_copy->m_pkthdr.len); 1612 m_freem(mb_copy); /* simply discard the packet */ 1613 } 1614 } 1615} 1616 1617static int 1618register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1619{ 1620#ifdef MRT6DEBUG 1621 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1622#endif 1623 struct mbuf *mm; 1624 int i, len = m->m_pkthdr.len; 1625 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1626 struct mrt6msg *im6; 1627 1628 MRT6_DLOG(DEBUG_ANY, "src %s dst %s", 1629 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1630 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1631 PIM6STAT_INC(pim6s_snd_registers); 1632 1633 /* Make a copy of the packet to send to the user level process. */ 1634 mm = m_gethdr(M_NOWAIT, MT_DATA); 1635 if (mm == NULL) 1636 return (ENOBUFS); 1637 mm->m_data += max_linkhdr; 1638 mm->m_len = sizeof(struct ip6_hdr); 1639 1640 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1641 m_freem(mm); 1642 return (ENOBUFS); 1643 } 1644 i = MHLEN - M_LEADINGSPACE(mm); 1645 if (i > len) 1646 i = len; 1647 mm = m_pullup(mm, i); 1648 if (mm == NULL) 1649 return (ENOBUFS); 1650/* TODO: check it! */ 1651 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1652 1653 /* 1654 * Send message to routing daemon 1655 */ 1656 sin6.sin6_addr = ip6->ip6_src; 1657 1658 im6 = mtod(mm, struct mrt6msg *); 1659 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1660 im6->im6_mbz = 0; 1661 1662 im6->im6_mif = mif - mif6table; 1663 1664 /* iif info is not given for reg. encap.n */ 1665 MRT6STAT_INC(mrt6s_upcalls); 1666 1667 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1668 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); 1669 MRT6STAT_INC(mrt6s_upq_sockfull); 1670 return (ENOBUFS); 1671 } 1672 return (0); 1673} 1674 1675/* 1676 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1677 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1678 * into the kernel. 1679 */ 1680static int 1681pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1682{ 1683 1684#ifdef DIAGNOSTIC 1685 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1686#endif 1687 if (proto != IPPROTO_PIM) 1688 return 0; /* not for us; reject the datagram. */ 1689 1690 return 64; /* claim the datagram. */ 1691} 1692 1693/* 1694 * PIM sparse mode hook 1695 * Receives the pim control messages, and passes them up to the listening 1696 * socket, using rip6_input. 1697 * The only message processed is the REGISTER pim message; the pim header 1698 * is stripped off, and the inner packet is passed to register_mforward. 1699 */ 1700int 1701pim6_input(struct mbuf **mp, int *offp, int proto) 1702{ 1703 struct pim *pim; /* pointer to a pim struct */ 1704 struct ip6_hdr *ip6; 1705 int pimlen; 1706 struct mbuf *m = *mp; 1707 int minlen; 1708 int off = *offp; 1709 1710 PIM6STAT_INC(pim6s_rcv_total); 1711 1712 ip6 = mtod(m, struct ip6_hdr *); 1713 pimlen = m->m_pkthdr.len - *offp; 1714 1715 /* 1716 * Validate lengths 1717 */ 1718 if (pimlen < PIM_MINLEN) { 1719 PIM6STAT_INC(pim6s_rcv_tooshort); 1720 MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); 1721 m_freem(m); 1722 return (IPPROTO_DONE); 1723 } 1724 1725 /* 1726 * if the packet is at least as big as a REGISTER, go ahead 1727 * and grab the PIM REGISTER header size, to avoid another 1728 * possible m_pullup() later. 1729 * 1730 * PIM_MINLEN == pimhdr + u_int32 == 8 1731 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1732 */ 1733 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1734 1735 /* 1736 * Make sure that the IP6 and PIM headers in contiguous memory, and 1737 * possibly the PIM REGISTER header 1738 */ 1739#ifndef PULLDOWN_TEST 1740 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1741 /* adjust pointer */ 1742 ip6 = mtod(m, struct ip6_hdr *); 1743 1744 /* adjust mbuf to point to the PIM header */ 1745 pim = (struct pim *)((caddr_t)ip6 + off); 1746#else 1747 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1748 if (pim == NULL) { 1749 PIM6STAT_INC(pim6s_rcv_tooshort); 1750 return (IPPROTO_DONE); 1751 } 1752#endif 1753 1754#define PIM6_CHECKSUM 1755#ifdef PIM6_CHECKSUM 1756 { 1757 int cksumlen; 1758 1759 /* 1760 * Validate checksum. 1761 * If PIM REGISTER, exclude the data packet 1762 */ 1763 if (pim->pim_type == PIM_REGISTER) 1764 cksumlen = PIM_MINLEN; 1765 else 1766 cksumlen = pimlen; 1767 1768 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1769 PIM6STAT_INC(pim6s_rcv_badsum); 1770 MRT6_DLOG(DEBUG_PIM, "invalid checksum"); 1771 m_freem(m); 1772 return (IPPROTO_DONE); 1773 } 1774 } 1775#endif /* PIM_CHECKSUM */ 1776 1777 /* PIM version check */ 1778 if (pim->pim_ver != PIM_VERSION) { 1779 PIM6STAT_INC(pim6s_rcv_badversion); 1780 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, 1781 "incorrect version %d, expecting %d", 1782 pim->pim_ver, PIM_VERSION); 1783 m_freem(m); 1784 return (IPPROTO_DONE); 1785 } 1786 1787 if (pim->pim_type == PIM_REGISTER) { 1788 /* 1789 * since this is a REGISTER, we'll make a copy of the register 1790 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1791 * routing daemon. 1792 */ 1793 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1794 1795 struct mbuf *mcp; 1796 struct ip6_hdr *eip6; 1797 u_int32_t *reghdr; 1798 int rc; 1799#ifdef MRT6DEBUG 1800 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1801#endif 1802 1803 PIM6STAT_INC(pim6s_rcv_registers); 1804 1805 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1806 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", 1807 reg_mif_num); 1808 m_freem(m); 1809 return (IPPROTO_DONE); 1810 } 1811 1812 reghdr = (u_int32_t *)(pim + 1); 1813 1814 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1815 goto pim6_input_to_daemon; 1816 1817 /* 1818 * Validate length 1819 */ 1820 if (pimlen < PIM6_REG_MINLEN) { 1821 PIM6STAT_INC(pim6s_rcv_tooshort); 1822 PIM6STAT_INC(pim6s_rcv_badregisters); 1823 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " 1824 "size too small %d from %s", 1825 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1826 m_freem(m); 1827 return (IPPROTO_DONE); 1828 } 1829 1830 eip6 = (struct ip6_hdr *) (reghdr + 1); 1831 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", 1832 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1833 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1834 ntohs(eip6->ip6_plen)); 1835 1836 /* verify the version number of the inner packet */ 1837 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1838 PIM6STAT_INC(pim6s_rcv_badregisters); 1839 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " 1840 "of the inner packet", 1841 (eip6->ip6_vfc & IPV6_VERSION)); 1842 m_freem(m); 1843 return (IPPROTO_NONE); 1844 } 1845 1846 /* verify the inner packet is destined to a mcast group */ 1847 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1848 PIM6STAT_INC(pim6s_rcv_badregisters); 1849 MRT6_DLOG(DEBUG_PIM, "inner packet of register " 1850 "is not multicast %s", 1851 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1852 m_freem(m); 1853 return (IPPROTO_DONE); 1854 } 1855 1856 /* 1857 * make a copy of the whole header to pass to the daemon later. 1858 */ 1859 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1860 if (mcp == NULL) { 1861 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " 1862 "could not copy register head"); 1863 m_freem(m); 1864 return (IPPROTO_DONE); 1865 } 1866 1867 /* 1868 * forward the inner ip6 packet; point m_data at the inner ip6. 1869 */ 1870 m_adj(m, off + PIM_MINLEN); 1871 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " 1872 "src %s, dst %s, mif %d", 1873 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1874 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num); 1875 1876 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1877 dst.sin6_family, 0); 1878 1879 /* prepare the register head to send to the mrouting daemon */ 1880 m = mcp; 1881 } 1882 1883 /* 1884 * Pass the PIM message up to the daemon; if it is a register message 1885 * pass the 'head' only up to the daemon. This includes the 1886 * encapsulator ip6 header, pim header, register header and the 1887 * encapsulated ip6 header. 1888 */ 1889 pim6_input_to_daemon: 1890 rip6_input(&m, offp, proto); 1891 return (IPPROTO_DONE); 1892} 1893 1894static int 1895ip6_mroute_modevent(module_t mod, int type, void *unused) 1896{ 1897 1898 switch (type) { 1899 case MOD_LOAD: 1900 MROUTER6_LOCK_INIT(); 1901 MFC6_LOCK_INIT(); 1902 MIF6_LOCK_INIT(); 1903 1904 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 1905 pim6_encapcheck, 1906 (const struct protosw *)&in6_pim_protosw, NULL); 1907 if (pim6_encap_cookie == NULL) { 1908 printf("ip6_mroute: unable to attach pim6 encap\n"); 1909 MIF6_LOCK_DESTROY(); 1910 MFC6_LOCK_DESTROY(); 1911 MROUTER6_LOCK_DESTROY(); 1912 return (EINVAL); 1913 } 1914 1915 ip6_mforward = X_ip6_mforward; 1916 ip6_mrouter_done = X_ip6_mrouter_done; 1917 ip6_mrouter_get = X_ip6_mrouter_get; 1918 ip6_mrouter_set = X_ip6_mrouter_set; 1919 mrt6_ioctl = X_mrt6_ioctl; 1920 break; 1921 1922 case MOD_UNLOAD: 1923 if (V_ip6_mrouter != NULL) 1924 return EINVAL; 1925 1926 if (pim6_encap_cookie) { 1927 encap_detach(pim6_encap_cookie); 1928 pim6_encap_cookie = NULL; 1929 } 1930 X_ip6_mrouter_done(); 1931 ip6_mforward = NULL; 1932 ip6_mrouter_done = NULL; 1933 ip6_mrouter_get = NULL; 1934 ip6_mrouter_set = NULL; 1935 mrt6_ioctl = NULL; 1936 1937 MIF6_LOCK_DESTROY(); 1938 MFC6_LOCK_DESTROY(); 1939 MROUTER6_LOCK_DESTROY(); 1940 break; 1941 1942 default: 1943 return (EOPNOTSUPP); 1944 } 1945 1946 return (0); 1947} 1948 1949static moduledata_t ip6_mroutemod = { 1950 "ip6_mroute", 1951 ip6_mroute_modevent, 1952 0 1953}; 1954 1955DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1956