1 /* 2 * IP multicast forwarding procedures 3 * 4 * Written by David Waitzman, BBN Labs, August 1988. 5 * Modified by Steve Deering, Stanford, February 1989. 6 * Modified by Mark J. Steiglitz, Stanford, May, 1991 7 * Modified by Van Jacobson, LBL, January 1993 8 * Modified by Ajit Thyagarajan, PARC, August 1993 9 * Modified by Bill Fenner, PARC, April 1995 10 * Modified by Ahmed Helmy, SGI, June 1996 11 * Modified by George Edmond Eddy (Rusty), ISI, February 1998 12 * Modified by Pavlin Radoslavov, USC/ISI, May 1998, August 1999, October 2000 13 * Modified by Hitoshi Asaeda, WIDE, August 2000 14 * Modified by Pavlin Radoslavov, ICSI, October 2002 15 * 16 * MROUTING Revision: 3.5 17 * and PIM-SMv2 and PIM-DM support, advanced API support, 18 * bandwidth metering and signaling 19 * 20 * $FreeBSD$ 21 */ 22 23 #include "opt_mac.h" 24 #include "opt_mrouting.h" 25 #include "opt_random_ip_id.h" 26 27 #ifdef PIM 28 #define _PIM_VT 1 29 #endif 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/lock.h> 34 #include <sys/mac.h> 35 #include <sys/malloc.h> 36 #include <sys/mbuf.h> 37 #include <sys/protosw.h> 38 #include <sys/signalvar.h> 39 #include <sys/socket.h> 40 #include <sys/socketvar.h> 41 #include <sys/sockio.h> 42 #include <sys/sx.h> 43 #include <sys/sysctl.h> 44 #include <sys/syslog.h> 45 #include <sys/systm.h> 46 #include <sys/time.h> 47 #include <net/if.h> 48 #include <net/netisr.h> 49 #include <net/route.h> 50 #include <netinet/in.h> 51 #include <netinet/igmp.h> 52 #include <netinet/in_systm.h> 53 #include <netinet/in_var.h> 54 #include <netinet/ip.h> 55 #include <netinet/ip_encap.h> 56 #include <netinet/ip_mroute.h> 57 #include <netinet/ip_var.h> 58 #ifdef PIM 59 #include <netinet/pim.h> 60 #include <netinet/pim_var.h> 61 #endif 62 #include <netinet/udp.h> 63 #include <machine/in_cksum.h> 64 65 /* 66 * Control debugging code for rsvp and multicast routing code. 67 * Can only set them with the debugger. 68 */ 69 static u_int rsvpdebug; /* non-zero enables debugging */ 70 71 static u_int mrtdebug; /* any set of the flags below */ 72 #define DEBUG_MFC 0x02 73 #define DEBUG_FORWARD 0x04 74 #define DEBUG_EXPIRE 0x08 75 #define DEBUG_XMIT 0x10 76 #define DEBUG_PIM 0x20 77 78 #define VIFI_INVALID ((vifi_t) -1) 79 80 #define M_HASCL(m) ((m)->m_flags & M_EXT) 81 82 static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast routing tables"); 83 84 /* 85 * Locking. We use two locks: one for the virtual interface table and 86 * one for the forwarding table. These locks may be nested in which case 87 * the VIF lock must always be taken first. Note that each lock is used 88 * to cover not only the specific data structure but also related data 89 * structures. It may be better to add more fine-grained locking later; 90 * it's not clear how performance-critical this code is. 91 */ 92 93 static struct mrtstat mrtstat; 94 SYSCTL_STRUCT(_net_inet_ip, OID_AUTO, mrtstat, CTLFLAG_RW, 95 &mrtstat, mrtstat, 96 "Multicast Routing Statistics (struct mrtstat, netinet/ip_mroute.h)"); 97 98 static struct mfc *mfctable[MFCTBLSIZ]; 99 SYSCTL_OPAQUE(_net_inet_ip, OID_AUTO, mfctable, CTLFLAG_RD, 100 &mfctable, sizeof(mfctable), "S,*mfc[MFCTBLSIZ]", 101 "Multicast Forwarding Table (struct *mfc[MFCTBLSIZ], netinet/ip_mroute.h)"); 102 103 static struct mtx mfc_mtx; 104 #define MFC_LOCK() mtx_lock(&mfc_mtx) 105 #define MFC_UNLOCK() mtx_unlock(&mfc_mtx) 106 #define MFC_LOCK_ASSERT() mtx_assert(&mfc_mtx, MA_OWNED) 107 #define MFC_LOCK_INIT() mtx_init(&mfc_mtx, "mroute mfc table", NULL, MTX_DEF) 108 #define MFC_LOCK_DESTROY() mtx_destroy(&mfc_mtx) 109 110 static struct vif viftable[MAXVIFS]; 111 SYSCTL_OPAQUE(_net_inet_ip, OID_AUTO, viftable, CTLFLAG_RD, 112 &viftable, sizeof(viftable), "S,vif[MAXVIFS]", 113 "Multicast Virtual Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)"); 114 115 static struct mtx vif_mtx; 116 #define VIF_LOCK() mtx_lock(&vif_mtx) 117 #define VIF_UNLOCK() mtx_unlock(&vif_mtx) 118 #define VIF_LOCK_ASSERT() mtx_assert(&vif_mtx, MA_OWNED) 119 #define VIF_LOCK_INIT() mtx_init(&vif_mtx, "mroute vif table", NULL, MTX_DEF) 120 #define VIF_LOCK_DESTROY() mtx_destroy(&vif_mtx) 121 122 static u_char nexpire[MFCTBLSIZ]; 123 124 static struct callout expire_upcalls_ch; 125 126 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 127 #define UPCALL_EXPIRE 6 /* number of timeouts */ 128 129 /* 130 * Define the token bucket filter structures 131 * tbftable -> each vif has one of these for storing info 132 */ 133 134 static struct tbf tbftable[MAXVIFS]; 135 #define TBF_REPROCESS (hz / 100) /* 100x / second */ 136 137 /* 138 * 'Interfaces' associated with decapsulator (so we can tell 139 * packets that went through it from ones that get reflected 140 * by a broken gateway). These interfaces are never linked into 141 * the system ifnet list & no routes point to them. I.e., packets 142 * can't be sent this way. They only exist as a placeholder for 143 * multicast source verification. 144 */ 145 static struct ifnet multicast_decap_if[MAXVIFS]; 146 147 #define ENCAP_TTL 64 148 #define ENCAP_PROTO IPPROTO_IPIP /* 4 */ 149 150 /* prototype IP hdr for encapsulated packets */ 151 static struct ip multicast_encap_iphdr = { 152 #if BYTE_ORDER == LITTLE_ENDIAN 153 sizeof(struct ip) >> 2, IPVERSION, 154 #else 155 IPVERSION, sizeof(struct ip) >> 2, 156 #endif 157 0, /* tos */ 158 sizeof(struct ip), /* total length */ 159 0, /* id */ 160 0, /* frag offset */ 161 ENCAP_TTL, ENCAP_PROTO, 162 0, /* checksum */ 163 }; 164 165 /* 166 * Bandwidth meter variables and constants 167 */ 168 static MALLOC_DEFINE(M_BWMETER, "bwmeter", "multicast upcall bw meters"); 169 /* 170 * Pending timeouts are stored in a hash table, the key being the 171 * expiration time. Periodically, the entries are analysed and processed. 172 */ 173 #define BW_METER_BUCKETS 1024 174 static struct bw_meter *bw_meter_timers[BW_METER_BUCKETS]; 175 static struct callout bw_meter_ch; 176 #define BW_METER_PERIOD (hz) /* periodical handling of bw meters */ 177 178 /* 179 * Pending upcalls are stored in a vector which is flushed when 180 * full, or periodically 181 */ 182 static struct bw_upcall bw_upcalls[BW_UPCALLS_MAX]; 183 static u_int bw_upcalls_n; /* # of pending upcalls */ 184 static struct callout bw_upcalls_ch; 185 #define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */ 186 187 #ifdef PIM 188 static struct pimstat pimstat; 189 SYSCTL_STRUCT(_net_inet_pim, PIMCTL_STATS, stats, CTLFLAG_RD, 190 &pimstat, pimstat, 191 "PIM Statistics (struct pimstat, netinet/pim_var.h)"); 192 193 /* 194 * Note: the PIM Register encapsulation adds the following in front of a 195 * data packet: 196 * 197 * struct pim_encap_hdr { 198 * struct ip ip; 199 * struct pim_encap_pimhdr pim; 200 * } 201 * 202 */ 203 204 struct pim_encap_pimhdr { 205 struct pim pim; 206 uint32_t flags; 207 }; 208 209 static struct ip pim_encap_iphdr = { 210 #if BYTE_ORDER == LITTLE_ENDIAN 211 sizeof(struct ip) >> 2, 212 IPVERSION, 213 #else 214 IPVERSION, 215 sizeof(struct ip) >> 2, 216 #endif 217 0, /* tos */ 218 sizeof(struct ip), /* total length */ 219 0, /* id */ 220 0, /* frag offset */ 221 ENCAP_TTL, 222 IPPROTO_PIM, 223 0, /* checksum */ 224 }; 225 226 static struct pim_encap_pimhdr pim_encap_pimhdr = { 227 { 228 PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */ 229 0, /* reserved */ 230 0, /* checksum */ 231 }, 232 0 /* flags */ 233 }; 234 235 static struct ifnet multicast_register_if; 236 static vifi_t reg_vif_num = VIFI_INVALID; 237 #endif /* PIM */ 238 239 /* 240 * Private variables. 241 */ 242 static vifi_t numvifs; 243 static const struct encaptab *encap_cookie; 244 245 /* 246 * one-back cache used by mroute_encapcheck to locate a tunnel's vif 247 * given a datagram's src ip address. 248 */ 249 static u_long last_encap_src; 250 static struct vif *last_encap_vif; 251 252 /* 253 * Callout for queue processing. 254 */ 255 static struct callout tbf_reprocess_ch; 256 257 static u_long X_ip_mcast_src(int vifi); 258 static int X_ip_mforward(struct ip *ip, struct ifnet *ifp, 259 struct mbuf *m, struct ip_moptions *imo); 260 static int X_ip_mrouter_done(void); 261 static int X_ip_mrouter_get(struct socket *so, struct sockopt *m); 262 static int X_ip_mrouter_set(struct socket *so, struct sockopt *m); 263 static int X_legal_vif_num(int vif); 264 static int X_mrt_ioctl(int cmd, caddr_t data); 265 266 static int get_sg_cnt(struct sioc_sg_req *); 267 static int get_vif_cnt(struct sioc_vif_req *); 268 static int ip_mrouter_init(struct socket *, int); 269 static int add_vif(struct vifctl *); 270 static int del_vif(vifi_t); 271 static int add_mfc(struct mfcctl2 *); 272 static int del_mfc(struct mfcctl2 *); 273 static int set_api_config(uint32_t *); /* chose API capabilities */ 274 static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *); 275 static int set_assert(int); 276 static void expire_upcalls(void *); 277 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t); 278 static void phyint_send(struct ip *, struct vif *, struct mbuf *); 279 static void encap_send(struct ip *, struct vif *, struct mbuf *); 280 static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long); 281 static void tbf_queue(struct vif *, struct mbuf *); 282 static void tbf_process_q(struct vif *); 283 static void tbf_reprocess_q(void *); 284 static int tbf_dq_sel(struct vif *, struct ip *); 285 static void tbf_send_packet(struct vif *, struct mbuf *); 286 static void tbf_update_tokens(struct vif *); 287 static int priority(struct vif *, struct ip *); 288 289 /* 290 * Bandwidth monitoring 291 */ 292 static void free_bw_list(struct bw_meter *list); 293 static int add_bw_upcall(struct bw_upcall *); 294 static int del_bw_upcall(struct bw_upcall *); 295 static void bw_meter_receive_packet(struct bw_meter *x, int plen, 296 struct timeval *nowp); 297 static void bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp); 298 static void bw_upcalls_send(void); 299 static void schedule_bw_meter(struct bw_meter *x, struct timeval *nowp); 300 static void unschedule_bw_meter(struct bw_meter *x); 301 static void bw_meter_process(void); 302 static void expire_bw_upcalls_send(void *); 303 static void expire_bw_meter_process(void *); 304 305 #ifdef PIM 306 static int pim_register_send(struct ip *, struct vif *, 307 struct mbuf *, struct mfc *); 308 static int pim_register_send_rp(struct ip *, struct vif *, 309 struct mbuf *, struct mfc *); 310 static int pim_register_send_upcall(struct ip *, struct vif *, 311 struct mbuf *, struct mfc *); 312 static struct mbuf *pim_register_prepare(struct ip *, struct mbuf *); 313 #endif 314 315 /* 316 * whether or not special PIM assert processing is enabled. 317 */ 318 static int pim_assert; 319 /* 320 * Rate limit for assert notification messages, in usec 321 */ 322 #define ASSERT_MSG_TIME 3000000 323 324 /* 325 * Kernel multicast routing API capabilities and setup. 326 * If more API capabilities are added to the kernel, they should be 327 * recorded in `mrt_api_support'. 328 */ 329 static const uint32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF | 330 MRT_MFC_FLAGS_BORDER_VIF | 331 MRT_MFC_RP | 332 MRT_MFC_BW_UPCALL); 333 static uint32_t mrt_api_config = 0; 334 335 /* 336 * Hash function for a source, group entry 337 */ 338 #define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \ 339 ((g) >> 20) ^ ((g) >> 10) ^ (g)) 340 341 /* 342 * Find a route for a given origin IP address and Multicast group address 343 * Type of service parameter to be added in the future!!! 344 * Statistics are updated by the caller if needed 345 * (mrtstat.mrts_mfc_lookups and mrtstat.mrts_mfc_misses) 346 */ 347 static struct mfc * 348 mfc_find(in_addr_t o, in_addr_t g) 349 { 350 struct mfc *rt; 351 352 MFC_LOCK_ASSERT(); 353 354 for (rt = mfctable[MFCHASH(o,g)]; rt; rt = rt->mfc_next) 355 if ((rt->mfc_origin.s_addr == o) && 356 (rt->mfc_mcastgrp.s_addr == g) && (rt->mfc_stall == NULL)) 357 break; 358 return rt; 359 } 360 361 /* 362 * Macros to compute elapsed time efficiently 363 * Borrowed from Van Jacobson's scheduling code 364 */ 365 #define TV_DELTA(a, b, delta) { \ 366 int xxs; \ 367 delta = (a).tv_usec - (b).tv_usec; \ 368 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 369 switch (xxs) { \ 370 case 2: \ 371 delta += 1000000; \ 372 /* FALLTHROUGH */ \ 373 case 1: \ 374 delta += 1000000; \ 375 break; \ 376 default: \ 377 delta += (1000000 * xxs); \ 378 } \ 379 } \ 380 } 381 382 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 383 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 384 385 /* 386 * Handle MRT setsockopt commands to modify the multicast routing tables. 387 */ 388 static int 389 X_ip_mrouter_set(struct socket *so, struct sockopt *sopt) 390 { 391 int error, optval; 392 vifi_t vifi; 393 struct vifctl vifc; 394 struct mfcctl2 mfc; 395 struct bw_upcall bw_upcall; 396 uint32_t i; 397 398 if (so != ip_mrouter && sopt->sopt_name != MRT_INIT) 399 return EPERM; 400 401 error = 0; 402 switch (sopt->sopt_name) { 403 case MRT_INIT: 404 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 405 if (error) 406 break; 407 error = ip_mrouter_init(so, optval); 408 break; 409 410 case MRT_DONE: 411 error = ip_mrouter_done(); 412 break; 413 414 case MRT_ADD_VIF: 415 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc); 416 if (error) 417 break; 418 error = add_vif(&vifc); 419 break; 420 421 case MRT_DEL_VIF: 422 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi); 423 if (error) 424 break; 425 error = del_vif(vifi); 426 break; 427 428 case MRT_ADD_MFC: 429 case MRT_DEL_MFC: 430 /* 431 * select data size depending on API version. 432 */ 433 if (sopt->sopt_name == MRT_ADD_MFC && 434 mrt_api_config & MRT_API_FLAGS_ALL) { 435 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl2), 436 sizeof(struct mfcctl2)); 437 } else { 438 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl), 439 sizeof(struct mfcctl)); 440 bzero((caddr_t)&mfc + sizeof(struct mfcctl), 441 sizeof(mfc) - sizeof(struct mfcctl)); 442 } 443 if (error) 444 break; 445 if (sopt->sopt_name == MRT_ADD_MFC) 446 error = add_mfc(&mfc); 447 else 448 error = del_mfc(&mfc); 449 break; 450 451 case MRT_ASSERT: 452 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 453 if (error) 454 break; 455 set_assert(optval); 456 break; 457 458 case MRT_API_CONFIG: 459 error = sooptcopyin(sopt, &i, sizeof i, sizeof i); 460 if (!error) 461 error = set_api_config(&i); 462 if (!error) 463 error = sooptcopyout(sopt, &i, sizeof i); 464 break; 465 466 case MRT_ADD_BW_UPCALL: 467 case MRT_DEL_BW_UPCALL: 468 error = sooptcopyin(sopt, &bw_upcall, sizeof bw_upcall, 469 sizeof bw_upcall); 470 if (error) 471 break; 472 if (sopt->sopt_name == MRT_ADD_BW_UPCALL) 473 error = add_bw_upcall(&bw_upcall); 474 else 475 error = del_bw_upcall(&bw_upcall); 476 break; 477 478 default: 479 error = EOPNOTSUPP; 480 break; 481 } 482 return error; 483 } 484 485 /* 486 * Handle MRT getsockopt commands 487 */ 488 static int 489 X_ip_mrouter_get(struct socket *so, struct sockopt *sopt) 490 { 491 int error; 492 static int version = 0x0305; /* !!! why is this here? XXX */ 493 494 switch (sopt->sopt_name) { 495 case MRT_VERSION: 496 error = sooptcopyout(sopt, &version, sizeof version); 497 break; 498 499 case MRT_ASSERT: 500 error = sooptcopyout(sopt, &pim_assert, sizeof pim_assert); 501 break; 502 503 case MRT_API_SUPPORT: 504 error = sooptcopyout(sopt, &mrt_api_support, sizeof mrt_api_support); 505 break; 506 507 case MRT_API_CONFIG: 508 error = sooptcopyout(sopt, &mrt_api_config, sizeof mrt_api_config); 509 break; 510 511 default: 512 error = EOPNOTSUPP; 513 break; 514 } 515 return error; 516 } 517 518 /* 519 * Handle ioctl commands to obtain information from the cache 520 */ 521 static int 522 X_mrt_ioctl(int cmd, caddr_t data) 523 { 524 int error = 0; 525 526 switch (cmd) { 527 case (SIOCGETVIFCNT): 528 error = get_vif_cnt((struct sioc_vif_req *)data); 529 break; 530 531 case (SIOCGETSGCNT): 532 error = get_sg_cnt((struct sioc_sg_req *)data); 533 break; 534 535 default: 536 error = EINVAL; 537 break; 538 } 539 return error; 540 } 541 542 /* 543 * returns the packet, byte, rpf-failure count for the source group provided 544 */ 545 static int 546 get_sg_cnt(struct sioc_sg_req *req) 547 { 548 struct mfc *rt; 549 550 MFC_LOCK(); 551 rt = mfc_find(req->src.s_addr, req->grp.s_addr); 552 if (rt == NULL) { 553 MFC_UNLOCK(); 554 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 555 return EADDRNOTAVAIL; 556 } 557 req->pktcnt = rt->mfc_pkt_cnt; 558 req->bytecnt = rt->mfc_byte_cnt; 559 req->wrong_if = rt->mfc_wrong_if; 560 MFC_UNLOCK(); 561 return 0; 562 } 563 564 /* 565 * returns the input and output packet and byte counts on the vif provided 566 */ 567 static int 568 get_vif_cnt(struct sioc_vif_req *req) 569 { 570 vifi_t vifi = req->vifi; 571 572 VIF_LOCK(); 573 if (vifi >= numvifs) { 574 VIF_UNLOCK(); 575 return EINVAL; 576 } 577 578 req->icount = viftable[vifi].v_pkt_in; 579 req->ocount = viftable[vifi].v_pkt_out; 580 req->ibytes = viftable[vifi].v_bytes_in; 581 req->obytes = viftable[vifi].v_bytes_out; 582 VIF_UNLOCK(); 583 584 return 0; 585 } 586 587 static void 588 ip_mrouter_reset(void) 589 { 590 bzero((caddr_t)mfctable, sizeof(mfctable)); 591 bzero((caddr_t)nexpire, sizeof(nexpire)); 592 593 pim_assert = 0; 594 mrt_api_config = 0; 595 596 callout_init(&expire_upcalls_ch, CALLOUT_MPSAFE); 597 598 bw_upcalls_n = 0; 599 bzero((caddr_t)bw_meter_timers, sizeof(bw_meter_timers)); 600 callout_init(&bw_upcalls_ch, CALLOUT_MPSAFE); 601 callout_init(&bw_meter_ch, CALLOUT_MPSAFE); 602 603 callout_init(&tbf_reprocess_ch, CALLOUT_MPSAFE); 604 } 605 606 static struct mtx mrouter_mtx; /* used to synch init/done work */ 607 608 /* 609 * Enable multicast routing 610 */ 611 static int 612 ip_mrouter_init(struct socket *so, int version) 613 { 614 if (mrtdebug) 615 log(LOG_DEBUG, "ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 616 so->so_type, so->so_proto->pr_protocol); 617 618 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP) 619 return EOPNOTSUPP; 620 621 if (version != 1) 622 return ENOPROTOOPT; 623 624 mtx_lock(&mrouter_mtx); 625 626 if (ip_mrouter != NULL) { 627 mtx_unlock(&mrouter_mtx); 628 return EADDRINUSE; 629 } 630 631 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, NULL); 632 633 callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, 634 expire_bw_upcalls_send, NULL); 635 callout_reset(&bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, NULL); 636 637 ip_mrouter = so; 638 639 mtx_unlock(&mrouter_mtx); 640 641 if (mrtdebug) 642 log(LOG_DEBUG, "ip_mrouter_init\n"); 643 644 return 0; 645 } 646 647 /* 648 * Disable multicast routing 649 */ 650 static int 651 X_ip_mrouter_done(void) 652 { 653 vifi_t vifi; 654 int i; 655 struct ifnet *ifp; 656 struct ifreq ifr; 657 struct mfc *rt; 658 struct rtdetq *rte; 659 660 mtx_lock(&mrouter_mtx); 661 662 if (ip_mrouter == NULL) { 663 mtx_unlock(&mrouter_mtx); 664 return EINVAL; 665 } 666 667 /* 668 * Detach/disable hooks to the reset of the system. 669 */ 670 ip_mrouter = NULL; 671 mrt_api_config = 0; 672 673 VIF_LOCK(); 674 if (encap_cookie) { 675 const struct encaptab *c = encap_cookie; 676 encap_cookie = NULL; 677 encap_detach(c); 678 } 679 VIF_UNLOCK(); 680 681 callout_stop(&tbf_reprocess_ch); 682 683 VIF_LOCK(); 684 /* 685 * For each phyint in use, disable promiscuous reception of all IP 686 * multicasts. 687 */ 688 for (vifi = 0; vifi < numvifs; vifi++) { 689 if (viftable[vifi].v_lcl_addr.s_addr != 0 && 690 !(viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) { 691 struct sockaddr_in *so = (struct sockaddr_in *)&(ifr.ifr_addr); 692 693 so->sin_len = sizeof(struct sockaddr_in); 694 so->sin_family = AF_INET; 695 so->sin_addr.s_addr = INADDR_ANY; 696 ifp = viftable[vifi].v_ifp; 697 if_allmulti(ifp, 0); 698 } 699 } 700 bzero((caddr_t)tbftable, sizeof(tbftable)); 701 bzero((caddr_t)viftable, sizeof(viftable)); 702 numvifs = 0; 703 pim_assert = 0; 704 VIF_UNLOCK(); 705 706 /* 707 * Free all multicast forwarding cache entries. 708 */ 709 callout_stop(&expire_upcalls_ch); 710 callout_stop(&bw_upcalls_ch); 711 callout_stop(&bw_meter_ch); 712 713 MFC_LOCK(); 714 for (i = 0; i < MFCTBLSIZ; i++) { 715 for (rt = mfctable[i]; rt != NULL; ) { 716 struct mfc *nr = rt->mfc_next; 717 718 for (rte = rt->mfc_stall; rte != NULL; ) { 719 struct rtdetq *n = rte->next; 720 721 m_freem(rte->m); 722 free(rte, M_MRTABLE); 723 rte = n; 724 } 725 free_bw_list(rt->mfc_bw_meter); 726 free(rt, M_MRTABLE); 727 rt = nr; 728 } 729 } 730 bzero((caddr_t)mfctable, sizeof(mfctable)); 731 bzero((caddr_t)nexpire, sizeof(nexpire)); 732 bw_upcalls_n = 0; 733 bzero(bw_meter_timers, sizeof(bw_meter_timers)); 734 MFC_UNLOCK(); 735 736 /* 737 * Reset de-encapsulation cache 738 */ 739 last_encap_src = INADDR_ANY; 740 last_encap_vif = NULL; 741 #ifdef PIM 742 reg_vif_num = VIFI_INVALID; 743 #endif 744 745 mtx_unlock(&mrouter_mtx); 746 747 if (mrtdebug) 748 log(LOG_DEBUG, "ip_mrouter_done\n"); 749 750 return 0; 751 } 752 753 /* 754 * Set PIM assert processing global 755 */ 756 static int 757 set_assert(int i) 758 { 759 if ((i != 1) && (i != 0)) 760 return EINVAL; 761 762 pim_assert = i; 763 764 return 0; 765 } 766 767 /* 768 * Configure API capabilities 769 */ 770 int 771 set_api_config(uint32_t *apival) 772 { 773 int i; 774 775 /* 776 * We can set the API capabilities only if it is the first operation 777 * after MRT_INIT. I.e.: 778 * - there are no vifs installed 779 * - pim_assert is not enabled 780 * - the MFC table is empty 781 */ 782 if (numvifs > 0) { 783 *apival = 0; 784 return EPERM; 785 } 786 if (pim_assert) { 787 *apival = 0; 788 return EPERM; 789 } 790 for (i = 0; i < MFCTBLSIZ; i++) { 791 if (mfctable[i] != NULL) { 792 *apival = 0; 793 return EPERM; 794 } 795 } 796 797 mrt_api_config = *apival & mrt_api_support; 798 *apival = mrt_api_config; 799 800 return 0; 801 } 802 803 /* 804 * Decide if a packet is from a tunnelled peer. 805 * Return 0 if not, 64 if so. XXX yuck.. 64 ??? 806 */ 807 static int 808 mroute_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 809 { 810 struct ip *ip = mtod(m, struct ip *); 811 int hlen = ip->ip_hl << 2; 812 813 /* 814 * don't claim the packet if it's not to a multicast destination or if 815 * we don't have an encapsulating tunnel with the source. 816 * Note: This code assumes that the remote site IP address 817 * uniquely identifies the tunnel (i.e., that this site has 818 * at most one tunnel with the remote site). 819 */ 820 if (!IN_MULTICAST(ntohl(((struct ip *)((char *)ip+hlen))->ip_dst.s_addr))) 821 return 0; 822 if (ip->ip_src.s_addr != last_encap_src) { 823 struct vif *vifp = viftable; 824 struct vif *vife = vifp + numvifs; 825 826 last_encap_src = ip->ip_src.s_addr; 827 last_encap_vif = NULL; 828 for ( ; vifp < vife; ++vifp) 829 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) { 830 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) == VIFF_TUNNEL) 831 last_encap_vif = vifp; 832 break; 833 } 834 } 835 if (last_encap_vif == NULL) { 836 last_encap_src = INADDR_ANY; 837 return 0; 838 } 839 return 64; 840 } 841 842 /* 843 * De-encapsulate a packet and feed it back through ip input (this 844 * routine is called whenever IP gets a packet that mroute_encap_func() 845 * claimed). 846 */ 847 static void 848 mroute_encap_input(struct mbuf *m, int off) 849 { 850 struct ip *ip = mtod(m, struct ip *); 851 int hlen = ip->ip_hl << 2; 852 853 if (hlen > sizeof(struct ip)) 854 ip_stripoptions(m, (struct mbuf *) 0); 855 m->m_data += sizeof(struct ip); 856 m->m_len -= sizeof(struct ip); 857 m->m_pkthdr.len -= sizeof(struct ip); 858 859 m->m_pkthdr.rcvif = last_encap_vif->v_ifp; 860 861 netisr_queue(NETISR_IP, m); 862 /* 863 * normally we would need a "schednetisr(NETISR_IP)" 864 * here but we were called by ip_input and it is going 865 * to loop back & try to dequeue the packet we just 866 * queued as soon as we return so we avoid the 867 * unnecessary software interrrupt. 868 * 869 * XXX 870 * This no longer holds - we may have direct-dispatched the packet, 871 * or there may be a queue processing limit. 872 */ 873 } 874 875 extern struct domain inetdomain; 876 static struct protosw mroute_encap_protosw = 877 { SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR, 878 mroute_encap_input, 0, 0, rip_ctloutput, 879 0, 880 0, 0, 0, 0, 881 &rip_usrreqs 882 }; 883 884 /* 885 * Add a vif to the vif table 886 */ 887 static int 888 add_vif(struct vifctl *vifcp) 889 { 890 struct vif *vifp = viftable + vifcp->vifc_vifi; 891 struct sockaddr_in sin = {sizeof sin, AF_INET}; 892 struct ifaddr *ifa; 893 struct ifnet *ifp; 894 int error; 895 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi; 896 897 VIF_LOCK(); 898 if (vifcp->vifc_vifi >= MAXVIFS) { 899 VIF_UNLOCK(); 900 return EINVAL; 901 } 902 if (vifp->v_lcl_addr.s_addr != INADDR_ANY) { 903 VIF_UNLOCK(); 904 return EADDRINUSE; 905 } 906 if (vifcp->vifc_lcl_addr.s_addr == INADDR_ANY) { 907 VIF_UNLOCK(); 908 return EADDRNOTAVAIL; 909 } 910 911 /* Find the interface with an address in AF_INET family */ 912 #ifdef PIM 913 if (vifcp->vifc_flags & VIFF_REGISTER) { 914 /* 915 * XXX: Because VIFF_REGISTER does not really need a valid 916 * local interface (e.g. it could be 127.0.0.2), we don't 917 * check its address. 918 */ 919 ifp = NULL; 920 } else 921 #endif 922 { 923 sin.sin_addr = vifcp->vifc_lcl_addr; 924 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 925 if (ifa == NULL) { 926 VIF_UNLOCK(); 927 return EADDRNOTAVAIL; 928 } 929 ifp = ifa->ifa_ifp; 930 } 931 932 if (vifcp->vifc_flags & VIFF_TUNNEL) { 933 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) { 934 /* 935 * An encapsulating tunnel is wanted. Tell 936 * mroute_encap_input() to start paying attention 937 * to encapsulated packets. 938 */ 939 if (encap_cookie == NULL) { 940 int i; 941 942 encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV4, 943 mroute_encapcheck, 944 (struct protosw *)&mroute_encap_protosw, NULL); 945 946 if (encap_cookie == NULL) { 947 printf("ip_mroute: unable to attach encap\n"); 948 VIF_UNLOCK(); 949 return EIO; /* XXX */ 950 } 951 for (i = 0; i < MAXVIFS; ++i) { 952 if_initname(&multicast_decap_if[i], "mdecap", i); 953 } 954 } 955 /* 956 * Set interface to fake encapsulator interface 957 */ 958 ifp = &multicast_decap_if[vifcp->vifc_vifi]; 959 /* 960 * Prepare cached route entry 961 */ 962 bzero(&vifp->v_route, sizeof(vifp->v_route)); 963 } else { 964 log(LOG_ERR, "source routed tunnels not supported\n"); 965 VIF_UNLOCK(); 966 return EOPNOTSUPP; 967 } 968 #ifdef PIM 969 } else if (vifcp->vifc_flags & VIFF_REGISTER) { 970 ifp = &multicast_register_if; 971 if (mrtdebug) 972 log(LOG_DEBUG, "Adding a register vif, ifp: %p\n", 973 (void *)&multicast_register_if); 974 if (reg_vif_num == VIFI_INVALID) { 975 if_initname(&multicast_register_if, "register_vif", 0); 976 multicast_register_if.if_flags = IFF_LOOPBACK; 977 bzero(&vifp->v_route, sizeof(vifp->v_route)); 978 reg_vif_num = vifcp->vifc_vifi; 979 } 980 #endif 981 } else { /* Make sure the interface supports multicast */ 982 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 983 VIF_UNLOCK(); 984 return EOPNOTSUPP; 985 } 986 987 /* Enable promiscuous reception of all IP multicasts from the if */ 988 error = if_allmulti(ifp, 1); 989 if (error) { 990 VIF_UNLOCK(); 991 return error; 992 } 993 } 994 995 /* define parameters for the tbf structure */ 996 vifp->v_tbf = v_tbf; 997 GET_TIME(vifp->v_tbf->tbf_last_pkt_t); 998 vifp->v_tbf->tbf_n_tok = 0; 999 vifp->v_tbf->tbf_q_len = 0; 1000 vifp->v_tbf->tbf_max_q_len = MAXQSIZE; 1001 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL; 1002 1003 vifp->v_flags = vifcp->vifc_flags; 1004 vifp->v_threshold = vifcp->vifc_threshold; 1005 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 1006 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 1007 vifp->v_ifp = ifp; 1008 /* scaling up here allows division by 1024 in critical code */ 1009 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000; 1010 vifp->v_rsvp_on = 0; 1011 vifp->v_rsvpd = NULL; 1012 /* initialize per vif pkt counters */ 1013 vifp->v_pkt_in = 0; 1014 vifp->v_pkt_out = 0; 1015 vifp->v_bytes_in = 0; 1016 vifp->v_bytes_out = 0; 1017 1018 /* Adjust numvifs up if the vifi is higher than numvifs */ 1019 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1; 1020 1021 VIF_UNLOCK(); 1022 1023 if (mrtdebug) 1024 log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n", 1025 vifcp->vifc_vifi, 1026 (u_long)ntohl(vifcp->vifc_lcl_addr.s_addr), 1027 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 1028 (u_long)ntohl(vifcp->vifc_rmt_addr.s_addr), 1029 vifcp->vifc_threshold, 1030 vifcp->vifc_rate_limit); 1031 1032 return 0; 1033 } 1034 1035 /* 1036 * Delete a vif from the vif table 1037 */ 1038 static int 1039 del_vif(vifi_t vifi) 1040 { 1041 struct vif *vifp; 1042 1043 VIF_LOCK(); 1044 1045 if (vifi >= numvifs) { 1046 VIF_UNLOCK(); 1047 return EINVAL; 1048 } 1049 vifp = &viftable[vifi]; 1050 if (vifp->v_lcl_addr.s_addr == INADDR_ANY) { 1051 VIF_UNLOCK(); 1052 return EADDRNOTAVAIL; 1053 } 1054 1055 if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) 1056 if_allmulti(vifp->v_ifp, 0); 1057 1058 if (vifp == last_encap_vif) { 1059 last_encap_vif = NULL; 1060 last_encap_src = INADDR_ANY; 1061 } 1062 1063 /* 1064 * Free packets queued at the interface 1065 */ 1066 while (vifp->v_tbf->tbf_q) { 1067 struct mbuf *m = vifp->v_tbf->tbf_q; 1068 1069 vifp->v_tbf->tbf_q = m->m_act; 1070 m_freem(m); 1071 } 1072 1073 #ifdef PIM 1074 if (vifp->v_flags & VIFF_REGISTER) 1075 reg_vif_num = VIFI_INVALID; 1076 #endif 1077 1078 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf))); 1079 bzero((caddr_t)vifp, sizeof (*vifp)); 1080 1081 if (mrtdebug) 1082 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs); 1083 1084 /* Adjust numvifs down */ 1085 for (vifi = numvifs; vifi > 0; vifi--) 1086 if (viftable[vifi-1].v_lcl_addr.s_addr != INADDR_ANY) 1087 break; 1088 numvifs = vifi; 1089 1090 VIF_UNLOCK(); 1091 1092 return 0; 1093 } 1094 1095 /* 1096 * update an mfc entry without resetting counters and S,G addresses. 1097 */ 1098 static void 1099 update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 1100 { 1101 int i; 1102 1103 rt->mfc_parent = mfccp->mfcc_parent; 1104 for (i = 0; i < numvifs; i++) { 1105 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 1106 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & mrt_api_config & 1107 MRT_MFC_FLAGS_ALL; 1108 } 1109 /* set the RP address */ 1110 if (mrt_api_config & MRT_MFC_RP) 1111 rt->mfc_rp = mfccp->mfcc_rp; 1112 else 1113 rt->mfc_rp.s_addr = INADDR_ANY; 1114 } 1115 1116 /* 1117 * fully initialize an mfc entry from the parameter. 1118 */ 1119 static void 1120 init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 1121 { 1122 rt->mfc_origin = mfccp->mfcc_origin; 1123 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 1124 1125 update_mfc_params(rt, mfccp); 1126 1127 /* initialize pkt counters per src-grp */ 1128 rt->mfc_pkt_cnt = 0; 1129 rt->mfc_byte_cnt = 0; 1130 rt->mfc_wrong_if = 0; 1131 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 1132 } 1133 1134 1135 /* 1136 * Add an mfc entry 1137 */ 1138 static int 1139 add_mfc(struct mfcctl2 *mfccp) 1140 { 1141 struct mfc *rt; 1142 u_long hash; 1143 struct rtdetq *rte; 1144 u_short nstl; 1145 1146 VIF_LOCK(); 1147 MFC_LOCK(); 1148 1149 rt = mfc_find(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 1150 1151 /* If an entry already exists, just update the fields */ 1152 if (rt) { 1153 if (mrtdebug & DEBUG_MFC) 1154 log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n", 1155 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1156 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1157 mfccp->mfcc_parent); 1158 1159 update_mfc_params(rt, mfccp); 1160 MFC_UNLOCK(); 1161 VIF_UNLOCK(); 1162 return 0; 1163 } 1164 1165 /* 1166 * Find the entry for which the upcall was made and update 1167 */ 1168 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 1169 for (rt = mfctable[hash], nstl = 0; rt; rt = rt->mfc_next) { 1170 1171 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 1172 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) && 1173 (rt->mfc_stall != NULL)) { 1174 1175 if (nstl++) 1176 log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n", 1177 "multiple kernel entries", 1178 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1179 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1180 mfccp->mfcc_parent, (void *)rt->mfc_stall); 1181 1182 if (mrtdebug & DEBUG_MFC) 1183 log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n", 1184 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1185 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1186 mfccp->mfcc_parent, (void *)rt->mfc_stall); 1187 1188 init_mfc_params(rt, mfccp); 1189 1190 rt->mfc_expire = 0; /* Don't clean this guy up */ 1191 nexpire[hash]--; 1192 1193 /* free packets Qed at the end of this entry */ 1194 for (rte = rt->mfc_stall; rte != NULL; ) { 1195 struct rtdetq *n = rte->next; 1196 1197 ip_mdq(rte->m, rte->ifp, rt, -1); 1198 m_freem(rte->m); 1199 free(rte, M_MRTABLE); 1200 rte = n; 1201 } 1202 rt->mfc_stall = NULL; 1203 } 1204 } 1205 1206 /* 1207 * It is possible that an entry is being inserted without an upcall 1208 */ 1209 if (nstl == 0) { 1210 if (mrtdebug & DEBUG_MFC) 1211 log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n", 1212 hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1213 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1214 mfccp->mfcc_parent); 1215 1216 for (rt = mfctable[hash]; rt != NULL; rt = rt->mfc_next) { 1217 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 1218 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) { 1219 init_mfc_params(rt, mfccp); 1220 if (rt->mfc_expire) 1221 nexpire[hash]--; 1222 rt->mfc_expire = 0; 1223 break; /* XXX */ 1224 } 1225 } 1226 if (rt == NULL) { /* no upcall, so make a new entry */ 1227 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1228 if (rt == NULL) { 1229 MFC_UNLOCK(); 1230 VIF_UNLOCK(); 1231 return ENOBUFS; 1232 } 1233 1234 init_mfc_params(rt, mfccp); 1235 rt->mfc_expire = 0; 1236 rt->mfc_stall = NULL; 1237 1238 rt->mfc_bw_meter = NULL; 1239 /* insert new entry at head of hash chain */ 1240 rt->mfc_next = mfctable[hash]; 1241 mfctable[hash] = rt; 1242 } 1243 } 1244 MFC_UNLOCK(); 1245 VIF_UNLOCK(); 1246 return 0; 1247 } 1248 1249 /* 1250 * Delete an mfc entry 1251 */ 1252 static int 1253 del_mfc(struct mfcctl2 *mfccp) 1254 { 1255 struct in_addr origin; 1256 struct in_addr mcastgrp; 1257 struct mfc *rt; 1258 struct mfc **nptr; 1259 u_long hash; 1260 struct bw_meter *list; 1261 1262 origin = mfccp->mfcc_origin; 1263 mcastgrp = mfccp->mfcc_mcastgrp; 1264 1265 if (mrtdebug & DEBUG_MFC) 1266 log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n", 1267 (u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr)); 1268 1269 MFC_LOCK(); 1270 1271 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr); 1272 for (nptr = &mfctable[hash]; (rt = *nptr) != NULL; nptr = &rt->mfc_next) 1273 if (origin.s_addr == rt->mfc_origin.s_addr && 1274 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr && 1275 rt->mfc_stall == NULL) 1276 break; 1277 if (rt == NULL) { 1278 MFC_UNLOCK(); 1279 return EADDRNOTAVAIL; 1280 } 1281 1282 *nptr = rt->mfc_next; 1283 1284 /* 1285 * free the bw_meter entries 1286 */ 1287 list = rt->mfc_bw_meter; 1288 rt->mfc_bw_meter = NULL; 1289 1290 free(rt, M_MRTABLE); 1291 1292 free_bw_list(list); 1293 1294 MFC_UNLOCK(); 1295 1296 return 0; 1297 } 1298 1299 /* 1300 * Send a message to mrouted on the multicast routing socket 1301 */ 1302 static int 1303 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src) 1304 { 1305 if (s) { 1306 mtx_lock(&Giant); /* XXX until sockets are locked */ 1307 if (sbappendaddr(&s->so_rcv, (struct sockaddr *)src, mm, NULL) != 0) { 1308 sorwakeup(s); 1309 mtx_unlock(&Giant); 1310 return 0; 1311 } 1312 mtx_unlock(&Giant); 1313 } 1314 m_freem(mm); 1315 return -1; 1316 } 1317 1318 /* 1319 * IP multicast forwarding function. This function assumes that the packet 1320 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1321 * pointed to by "ifp", and the packet is to be relayed to other networks 1322 * that have members of the packet's destination IP multicast group. 1323 * 1324 * The packet is returned unscathed to the caller, unless it is 1325 * erroneous, in which case a non-zero return value tells the caller to 1326 * discard it. 1327 */ 1328 1329 #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1330 1331 static int 1332 X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m, 1333 struct ip_moptions *imo) 1334 { 1335 struct mfc *rt; 1336 int error; 1337 vifi_t vifi; 1338 1339 if (mrtdebug & DEBUG_FORWARD) 1340 log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n", 1341 (u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), 1342 (void *)ifp); 1343 1344 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 || 1345 ((u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1346 /* 1347 * Packet arrived via a physical interface or 1348 * an encapsulated tunnel or a register_vif. 1349 */ 1350 } else { 1351 /* 1352 * Packet arrived through a source-route tunnel. 1353 * Source-route tunnels are no longer supported. 1354 */ 1355 static int last_log; 1356 if (last_log != time_second) { 1357 last_log = time_second; 1358 log(LOG_ERR, 1359 "ip_mforward: received source-routed packet from %lx\n", 1360 (u_long)ntohl(ip->ip_src.s_addr)); 1361 } 1362 return 1; 1363 } 1364 1365 VIF_LOCK(); 1366 MFC_LOCK(); 1367 if (imo && ((vifi = imo->imo_multicast_vif) < numvifs)) { 1368 if (ip->ip_ttl < 255) 1369 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1370 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1371 struct vif *vifp = viftable + vifi; 1372 1373 printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s)\n", 1374 (long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr), 1375 vifi, 1376 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1377 vifp->v_ifp->if_xname); 1378 } 1379 error = ip_mdq(m, ifp, NULL, vifi); 1380 MFC_UNLOCK(); 1381 VIF_UNLOCK(); 1382 return error; 1383 } 1384 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1385 printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n", 1386 (long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr)); 1387 if (!imo) 1388 printf("In fact, no options were specified at all\n"); 1389 } 1390 1391 /* 1392 * Don't forward a packet with time-to-live of zero or one, 1393 * or a packet destined to a local-only group. 1394 */ 1395 if (ip->ip_ttl <= 1 || ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP) { 1396 MFC_UNLOCK(); 1397 VIF_UNLOCK(); 1398 return 0; 1399 } 1400 1401 /* 1402 * Determine forwarding vifs from the forwarding cache table 1403 */ 1404 ++mrtstat.mrts_mfc_lookups; 1405 rt = mfc_find(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1406 1407 /* Entry exists, so forward if necessary */ 1408 if (rt != NULL) { 1409 error = ip_mdq(m, ifp, rt, -1); 1410 MFC_UNLOCK(); 1411 VIF_UNLOCK(); 1412 return error; 1413 } else { 1414 /* 1415 * If we don't have a route for packet's origin, 1416 * Make a copy of the packet & send message to routing daemon 1417 */ 1418 1419 struct mbuf *mb0; 1420 struct rtdetq *rte; 1421 u_long hash; 1422 int hlen = ip->ip_hl << 2; 1423 1424 ++mrtstat.mrts_mfc_misses; 1425 1426 mrtstat.mrts_no_route++; 1427 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1428 log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n", 1429 (u_long)ntohl(ip->ip_src.s_addr), 1430 (u_long)ntohl(ip->ip_dst.s_addr)); 1431 1432 /* 1433 * Allocate mbufs early so that we don't do extra work if we are 1434 * just going to fail anyway. Make sure to pullup the header so 1435 * that other people can't step on it. 1436 */ 1437 rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, M_NOWAIT); 1438 if (rte == NULL) { 1439 MFC_UNLOCK(); 1440 VIF_UNLOCK(); 1441 return ENOBUFS; 1442 } 1443 mb0 = m_copypacket(m, M_DONTWAIT); 1444 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen)) 1445 mb0 = m_pullup(mb0, hlen); 1446 if (mb0 == NULL) { 1447 free(rte, M_MRTABLE); 1448 MFC_UNLOCK(); 1449 VIF_UNLOCK(); 1450 return ENOBUFS; 1451 } 1452 1453 /* is there an upcall waiting for this flow ? */ 1454 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1455 for (rt = mfctable[hash]; rt; rt = rt->mfc_next) { 1456 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) && 1457 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) && 1458 (rt->mfc_stall != NULL)) 1459 break; 1460 } 1461 1462 if (rt == NULL) { 1463 int i; 1464 struct igmpmsg *im; 1465 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1466 struct mbuf *mm; 1467 1468 /* 1469 * Locate the vifi for the incoming interface for this packet. 1470 * If none found, drop packet. 1471 */ 1472 for (vifi=0; vifi < numvifs && viftable[vifi].v_ifp != ifp; vifi++) 1473 ; 1474 if (vifi >= numvifs) /* vif not found, drop packet */ 1475 goto non_fatal; 1476 1477 /* no upcall, so make a new entry */ 1478 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1479 if (rt == NULL) 1480 goto fail; 1481 /* Make a copy of the header to send to the user level process */ 1482 mm = m_copy(mb0, 0, hlen); 1483 if (mm == NULL) 1484 goto fail1; 1485 1486 /* 1487 * Send message to routing daemon to install 1488 * a route into the kernel table 1489 */ 1490 1491 im = mtod(mm, struct igmpmsg *); 1492 im->im_msgtype = IGMPMSG_NOCACHE; 1493 im->im_mbz = 0; 1494 im->im_vif = vifi; 1495 1496 mrtstat.mrts_upcalls++; 1497 1498 k_igmpsrc.sin_addr = ip->ip_src; 1499 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1500 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n"); 1501 ++mrtstat.mrts_upq_sockfull; 1502 fail1: 1503 free(rt, M_MRTABLE); 1504 fail: 1505 free(rte, M_MRTABLE); 1506 m_freem(mb0); 1507 MFC_UNLOCK(); 1508 VIF_UNLOCK(); 1509 return ENOBUFS; 1510 } 1511 1512 /* insert new entry at head of hash chain */ 1513 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1514 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1515 rt->mfc_expire = UPCALL_EXPIRE; 1516 nexpire[hash]++; 1517 for (i = 0; i < numvifs; i++) { 1518 rt->mfc_ttls[i] = 0; 1519 rt->mfc_flags[i] = 0; 1520 } 1521 rt->mfc_parent = -1; 1522 1523 rt->mfc_rp.s_addr = INADDR_ANY; /* clear the RP address */ 1524 1525 rt->mfc_bw_meter = NULL; 1526 1527 /* link into table */ 1528 rt->mfc_next = mfctable[hash]; 1529 mfctable[hash] = rt; 1530 rt->mfc_stall = rte; 1531 1532 } else { 1533 /* determine if q has overflowed */ 1534 int npkts = 0; 1535 struct rtdetq **p; 1536 1537 /* 1538 * XXX ouch! we need to append to the list, but we 1539 * only have a pointer to the front, so we have to 1540 * scan the entire list every time. 1541 */ 1542 for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next) 1543 npkts++; 1544 1545 if (npkts > MAX_UPQ) { 1546 mrtstat.mrts_upq_ovflw++; 1547 non_fatal: 1548 free(rte, M_MRTABLE); 1549 m_freem(mb0); 1550 MFC_UNLOCK(); 1551 VIF_UNLOCK(); 1552 return 0; 1553 } 1554 1555 /* Add this entry to the end of the queue */ 1556 *p = rte; 1557 } 1558 1559 rte->m = mb0; 1560 rte->ifp = ifp; 1561 rte->next = NULL; 1562 1563 MFC_UNLOCK(); 1564 VIF_UNLOCK(); 1565 1566 return 0; 1567 } 1568 } 1569 1570 /* 1571 * Clean up the cache entry if upcall is not serviced 1572 */ 1573 static void 1574 expire_upcalls(void *unused) 1575 { 1576 struct rtdetq *rte; 1577 struct mfc *mfc, **nptr; 1578 int i; 1579 1580 MFC_LOCK(); 1581 for (i = 0; i < MFCTBLSIZ; i++) { 1582 if (nexpire[i] == 0) 1583 continue; 1584 nptr = &mfctable[i]; 1585 for (mfc = *nptr; mfc != NULL; mfc = *nptr) { 1586 /* 1587 * Skip real cache entries 1588 * Make sure it wasn't marked to not expire (shouldn't happen) 1589 * If it expires now 1590 */ 1591 if (mfc->mfc_stall != NULL && mfc->mfc_expire != 0 && 1592 --mfc->mfc_expire == 0) { 1593 if (mrtdebug & DEBUG_EXPIRE) 1594 log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n", 1595 (u_long)ntohl(mfc->mfc_origin.s_addr), 1596 (u_long)ntohl(mfc->mfc_mcastgrp.s_addr)); 1597 /* 1598 * drop all the packets 1599 * free the mbuf with the pkt, if, timing info 1600 */ 1601 for (rte = mfc->mfc_stall; rte; ) { 1602 struct rtdetq *n = rte->next; 1603 1604 m_freem(rte->m); 1605 free(rte, M_MRTABLE); 1606 rte = n; 1607 } 1608 ++mrtstat.mrts_cache_cleanups; 1609 nexpire[i]--; 1610 1611 /* 1612 * free the bw_meter entries 1613 */ 1614 while (mfc->mfc_bw_meter != NULL) { 1615 struct bw_meter *x = mfc->mfc_bw_meter; 1616 1617 mfc->mfc_bw_meter = x->bm_mfc_next; 1618 free(x, M_BWMETER); 1619 } 1620 1621 *nptr = mfc->mfc_next; 1622 free(mfc, M_MRTABLE); 1623 } else { 1624 nptr = &mfc->mfc_next; 1625 } 1626 } 1627 } 1628 MFC_UNLOCK(); 1629 1630 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, NULL); 1631 } 1632 1633 /* 1634 * Packet forwarding routine once entry in the cache is made 1635 */ 1636 static int 1637 ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif) 1638 { 1639 struct ip *ip = mtod(m, struct ip *); 1640 vifi_t vifi; 1641 int plen = ip->ip_len; 1642 1643 VIF_LOCK_ASSERT(); 1644 /* 1645 * Macro to send packet on vif. Since RSVP packets don't get counted on 1646 * input, they shouldn't get counted on output, so statistics keeping is 1647 * separate. 1648 */ 1649 #define MC_SEND(ip,vifp,m) { \ 1650 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1651 encap_send((ip), (vifp), (m)); \ 1652 else \ 1653 phyint_send((ip), (vifp), (m)); \ 1654 } 1655 1656 /* 1657 * If xmt_vif is not -1, send on only the requested vif. 1658 * 1659 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1660 */ 1661 if (xmt_vif < numvifs) { 1662 #ifdef PIM 1663 if (viftable[xmt_vif].v_flags & VIFF_REGISTER) 1664 pim_register_send(ip, viftable + xmt_vif, m, rt); 1665 else 1666 #endif 1667 MC_SEND(ip, viftable + xmt_vif, m); 1668 return 1; 1669 } 1670 1671 /* 1672 * Don't forward if it didn't arrive from the parent vif for its origin. 1673 */ 1674 vifi = rt->mfc_parent; 1675 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1676 /* came in the wrong interface */ 1677 if (mrtdebug & DEBUG_FORWARD) 1678 log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n", 1679 (void *)ifp, vifi, (void *)viftable[vifi].v_ifp); 1680 ++mrtstat.mrts_wrong_if; 1681 ++rt->mfc_wrong_if; 1682 /* 1683 * If we are doing PIM assert processing, send a message 1684 * to the routing daemon. 1685 * 1686 * XXX: A PIM-SM router needs the WRONGVIF detection so it 1687 * can complete the SPT switch, regardless of the type 1688 * of the iif (broadcast media, GRE tunnel, etc). 1689 */ 1690 if (pim_assert && (vifi < numvifs) && viftable[vifi].v_ifp) { 1691 struct timeval now; 1692 u_long delta; 1693 1694 #ifdef PIM 1695 if (ifp == &multicast_register_if) 1696 pimstat.pims_rcv_registers_wrongiif++; 1697 #endif 1698 1699 /* Get vifi for the incoming packet */ 1700 for (vifi=0; vifi < numvifs && viftable[vifi].v_ifp != ifp; vifi++) 1701 ; 1702 if (vifi >= numvifs) 1703 return 0; /* The iif is not found: ignore the packet. */ 1704 1705 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF) 1706 return 0; /* WRONGVIF disabled: ignore the packet */ 1707 1708 GET_TIME(now); 1709 1710 TV_DELTA(rt->mfc_last_assert, now, delta); 1711 1712 if (delta > ASSERT_MSG_TIME) { 1713 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1714 struct igmpmsg *im; 1715 int hlen = ip->ip_hl << 2; 1716 struct mbuf *mm = m_copy(m, 0, hlen); 1717 1718 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1719 mm = m_pullup(mm, hlen); 1720 if (mm == NULL) 1721 return ENOBUFS; 1722 1723 rt->mfc_last_assert = now; 1724 1725 im = mtod(mm, struct igmpmsg *); 1726 im->im_msgtype = IGMPMSG_WRONGVIF; 1727 im->im_mbz = 0; 1728 im->im_vif = vifi; 1729 1730 mrtstat.mrts_upcalls++; 1731 1732 k_igmpsrc.sin_addr = im->im_src; 1733 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1734 log(LOG_WARNING, 1735 "ip_mforward: ip_mrouter socket queue full\n"); 1736 ++mrtstat.mrts_upq_sockfull; 1737 return ENOBUFS; 1738 } 1739 } 1740 } 1741 return 0; 1742 } 1743 1744 /* If I sourced this packet, it counts as output, else it was input. */ 1745 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) { 1746 viftable[vifi].v_pkt_out++; 1747 viftable[vifi].v_bytes_out += plen; 1748 } else { 1749 viftable[vifi].v_pkt_in++; 1750 viftable[vifi].v_bytes_in += plen; 1751 } 1752 rt->mfc_pkt_cnt++; 1753 rt->mfc_byte_cnt += plen; 1754 1755 /* 1756 * For each vif, decide if a copy of the packet should be forwarded. 1757 * Forward if: 1758 * - the ttl exceeds the vif's threshold 1759 * - there are group members downstream on interface 1760 */ 1761 for (vifi = 0; vifi < numvifs; vifi++) 1762 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1763 viftable[vifi].v_pkt_out++; 1764 viftable[vifi].v_bytes_out += plen; 1765 #ifdef PIM 1766 if (viftable[vifi].v_flags & VIFF_REGISTER) 1767 pim_register_send(ip, viftable + vifi, m, rt); 1768 else 1769 #endif 1770 MC_SEND(ip, viftable+vifi, m); 1771 } 1772 1773 /* 1774 * Perform upcall-related bw measuring. 1775 */ 1776 if (rt->mfc_bw_meter != NULL) { 1777 struct bw_meter *x; 1778 struct timeval now; 1779 1780 GET_TIME(now); 1781 MFC_LOCK_ASSERT(); 1782 for (x = rt->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) 1783 bw_meter_receive_packet(x, plen, &now); 1784 } 1785 1786 return 0; 1787 } 1788 1789 /* 1790 * check if a vif number is legal/ok. This is used by ip_output. 1791 */ 1792 static int 1793 X_legal_vif_num(int vif) 1794 { 1795 /* XXX unlocked, matter? */ 1796 return (vif >= 0 && vif < numvifs); 1797 } 1798 1799 /* 1800 * Return the local address used by this vif 1801 */ 1802 static u_long 1803 X_ip_mcast_src(int vifi) 1804 { 1805 /* XXX unlocked, matter? */ 1806 if (vifi >= 0 && vifi < numvifs) 1807 return viftable[vifi].v_lcl_addr.s_addr; 1808 else 1809 return INADDR_ANY; 1810 } 1811 1812 static void 1813 phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1814 { 1815 struct mbuf *mb_copy; 1816 int hlen = ip->ip_hl << 2; 1817 1818 VIF_LOCK_ASSERT(); 1819 1820 /* 1821 * Make a new reference to the packet; make sure that 1822 * the IP header is actually copied, not just referenced, 1823 * so that ip_output() only scribbles on the copy. 1824 */ 1825 mb_copy = m_copypacket(m, M_DONTWAIT); 1826 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1827 mb_copy = m_pullup(mb_copy, hlen); 1828 if (mb_copy == NULL) 1829 return; 1830 1831 if (vifp->v_rate_limit == 0) 1832 tbf_send_packet(vifp, mb_copy); 1833 else 1834 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len); 1835 } 1836 1837 static void 1838 encap_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1839 { 1840 struct mbuf *mb_copy; 1841 struct ip *ip_copy; 1842 int i, len = ip->ip_len; 1843 1844 VIF_LOCK_ASSERT(); 1845 1846 /* Take care of delayed checksums */ 1847 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1848 in_delayed_cksum(m); 1849 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1850 } 1851 1852 /* 1853 * copy the old packet & pullup its IP header into the 1854 * new mbuf so we can modify it. Try to fill the new 1855 * mbuf since if we don't the ethernet driver will. 1856 */ 1857 MGETHDR(mb_copy, M_DONTWAIT, MT_HEADER); 1858 if (mb_copy == NULL) 1859 return; 1860 #ifdef MAC 1861 mac_create_mbuf_multicast_encap(m, vifp->v_ifp, mb_copy); 1862 #endif 1863 mb_copy->m_data += max_linkhdr; 1864 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1865 1866 if ((mb_copy->m_next = m_copypacket(m, M_DONTWAIT)) == NULL) { 1867 m_freem(mb_copy); 1868 return; 1869 } 1870 i = MHLEN - M_LEADINGSPACE(mb_copy); 1871 if (i > len) 1872 i = len; 1873 mb_copy = m_pullup(mb_copy, i); 1874 if (mb_copy == NULL) 1875 return; 1876 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr); 1877 1878 /* 1879 * fill in the encapsulating IP header. 1880 */ 1881 ip_copy = mtod(mb_copy, struct ip *); 1882 *ip_copy = multicast_encap_iphdr; 1883 #ifdef RANDOM_IP_ID 1884 ip_copy->ip_id = ip_randomid(); 1885 #else 1886 ip_copy->ip_id = htons(ip_id++); 1887 #endif 1888 ip_copy->ip_len += len; 1889 ip_copy->ip_src = vifp->v_lcl_addr; 1890 ip_copy->ip_dst = vifp->v_rmt_addr; 1891 1892 /* 1893 * turn the encapsulated IP header back into a valid one. 1894 */ 1895 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1896 --ip->ip_ttl; 1897 ip->ip_len = htons(ip->ip_len); 1898 ip->ip_off = htons(ip->ip_off); 1899 ip->ip_sum = 0; 1900 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1901 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1902 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1903 1904 if (vifp->v_rate_limit == 0) 1905 tbf_send_packet(vifp, mb_copy); 1906 else 1907 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len); 1908 } 1909 1910 /* 1911 * Token bucket filter module 1912 */ 1913 1914 static void 1915 tbf_control(struct vif *vifp, struct mbuf *m, struct ip *ip, u_long p_len) 1916 { 1917 struct tbf *t = vifp->v_tbf; 1918 1919 VIF_LOCK_ASSERT(); 1920 1921 if (p_len > MAX_BKT_SIZE) { /* drop if packet is too large */ 1922 mrtstat.mrts_pkt2large++; 1923 m_freem(m); 1924 return; 1925 } 1926 1927 tbf_update_tokens(vifp); 1928 1929 if (t->tbf_q_len == 0) { /* queue empty... */ 1930 if (p_len <= t->tbf_n_tok) { /* send packet if enough tokens */ 1931 t->tbf_n_tok -= p_len; 1932 tbf_send_packet(vifp, m); 1933 } else { /* no, queue packet and try later */ 1934 tbf_queue(vifp, m); 1935 callout_reset(&tbf_reprocess_ch, TBF_REPROCESS, 1936 tbf_reprocess_q, vifp); 1937 } 1938 } else if (t->tbf_q_len < t->tbf_max_q_len) { 1939 /* finite queue length, so queue pkts and process queue */ 1940 tbf_queue(vifp, m); 1941 tbf_process_q(vifp); 1942 } else { 1943 /* queue full, try to dq and queue and process */ 1944 if (!tbf_dq_sel(vifp, ip)) { 1945 mrtstat.mrts_q_overflow++; 1946 m_freem(m); 1947 } else { 1948 tbf_queue(vifp, m); 1949 tbf_process_q(vifp); 1950 } 1951 } 1952 } 1953 1954 /* 1955 * adds a packet to the queue at the interface 1956 */ 1957 static void 1958 tbf_queue(struct vif *vifp, struct mbuf *m) 1959 { 1960 struct tbf *t = vifp->v_tbf; 1961 1962 VIF_LOCK_ASSERT(); 1963 1964 if (t->tbf_t == NULL) /* Queue was empty */ 1965 t->tbf_q = m; 1966 else /* Insert at tail */ 1967 t->tbf_t->m_act = m; 1968 1969 t->tbf_t = m; /* Set new tail pointer */ 1970 1971 #ifdef DIAGNOSTIC 1972 /* Make sure we didn't get fed a bogus mbuf */ 1973 if (m->m_act) 1974 panic("tbf_queue: m_act"); 1975 #endif 1976 m->m_act = NULL; 1977 1978 t->tbf_q_len++; 1979 } 1980 1981 /* 1982 * processes the queue at the interface 1983 */ 1984 static void 1985 tbf_process_q(struct vif *vifp) 1986 { 1987 struct tbf *t = vifp->v_tbf; 1988 1989 VIF_LOCK_ASSERT(); 1990 1991 /* loop through the queue at the interface and send as many packets 1992 * as possible 1993 */ 1994 while (t->tbf_q_len > 0) { 1995 struct mbuf *m = t->tbf_q; 1996 int len = mtod(m, struct ip *)->ip_len; 1997 1998 /* determine if the packet can be sent */ 1999 if (len > t->tbf_n_tok) /* not enough tokens, we are done */ 2000 break; 2001 /* ok, reduce no of tokens, dequeue and send the packet. */ 2002 t->tbf_n_tok -= len; 2003 2004 t->tbf_q = m->m_act; 2005 if (--t->tbf_q_len == 0) 2006 t->tbf_t = NULL; 2007 2008 m->m_act = NULL; 2009 tbf_send_packet(vifp, m); 2010 } 2011 } 2012 2013 static void 2014 tbf_reprocess_q(void *xvifp) 2015 { 2016 struct vif *vifp = xvifp; 2017 2018 if (ip_mrouter == NULL) 2019 return; 2020 VIF_LOCK(); 2021 tbf_update_tokens(vifp); 2022 tbf_process_q(vifp); 2023 if (vifp->v_tbf->tbf_q_len) 2024 callout_reset(&tbf_reprocess_ch, TBF_REPROCESS, tbf_reprocess_q, vifp); 2025 VIF_UNLOCK(); 2026 } 2027 2028 /* function that will selectively discard a member of the queue 2029 * based on the precedence value and the priority 2030 */ 2031 static int 2032 tbf_dq_sel(struct vif *vifp, struct ip *ip) 2033 { 2034 u_int p; 2035 struct mbuf *m, *last; 2036 struct mbuf **np; 2037 struct tbf *t = vifp->v_tbf; 2038 2039 VIF_LOCK_ASSERT(); 2040 2041 p = priority(vifp, ip); 2042 2043 np = &t->tbf_q; 2044 last = NULL; 2045 while ((m = *np) != NULL) { 2046 if (p > priority(vifp, mtod(m, struct ip *))) { 2047 *np = m->m_act; 2048 /* If we're removing the last packet, fix the tail pointer */ 2049 if (m == t->tbf_t) 2050 t->tbf_t = last; 2051 m_freem(m); 2052 /* It's impossible for the queue to be empty, but check anyways. */ 2053 if (--t->tbf_q_len == 0) 2054 t->tbf_t = NULL; 2055 mrtstat.mrts_drop_sel++; 2056 return 1; 2057 } 2058 np = &m->m_act; 2059 last = m; 2060 } 2061 return 0; 2062 } 2063 2064 static void 2065 tbf_send_packet(struct vif *vifp, struct mbuf *m) 2066 { 2067 VIF_LOCK_ASSERT(); 2068 2069 if (vifp->v_flags & VIFF_TUNNEL) /* If tunnel options */ 2070 ip_output(m, NULL, &vifp->v_route, IP_FORWARDING, NULL, NULL); 2071 else { 2072 struct ip_moptions imo; 2073 int error; 2074 static struct route ro; /* XXX check this */ 2075 2076 imo.imo_multicast_ifp = vifp->v_ifp; 2077 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 2078 imo.imo_multicast_loop = 1; 2079 imo.imo_multicast_vif = -1; 2080 2081 /* 2082 * Re-entrancy should not be a problem here, because 2083 * the packets that we send out and are looped back at us 2084 * should get rejected because they appear to come from 2085 * the loopback interface, thus preventing looping. 2086 */ 2087 error = ip_output(m, NULL, &ro, IP_FORWARDING, &imo, NULL); 2088 2089 if (mrtdebug & DEBUG_XMIT) 2090 log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 2091 (int)(vifp - viftable), error); 2092 } 2093 } 2094 2095 /* determine the current time and then 2096 * the elapsed time (between the last time and time now) 2097 * in milliseconds & update the no. of tokens in the bucket 2098 */ 2099 static void 2100 tbf_update_tokens(struct vif *vifp) 2101 { 2102 struct timeval tp; 2103 u_long tm; 2104 struct tbf *t = vifp->v_tbf; 2105 2106 VIF_LOCK_ASSERT(); 2107 2108 GET_TIME(tp); 2109 2110 TV_DELTA(tp, t->tbf_last_pkt_t, tm); 2111 2112 /* 2113 * This formula is actually 2114 * "time in seconds" * "bytes/second". 2115 * 2116 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 2117 * 2118 * The (1000/1024) was introduced in add_vif to optimize 2119 * this divide into a shift. 2120 */ 2121 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8; 2122 t->tbf_last_pkt_t = tp; 2123 2124 if (t->tbf_n_tok > MAX_BKT_SIZE) 2125 t->tbf_n_tok = MAX_BKT_SIZE; 2126 } 2127 2128 static int 2129 priority(struct vif *vifp, struct ip *ip) 2130 { 2131 int prio = 50; /* the lowest priority -- default case */ 2132 2133 /* temporary hack; may add general packet classifier some day */ 2134 2135 /* 2136 * The UDP port space is divided up into four priority ranges: 2137 * [0, 16384) : unclassified - lowest priority 2138 * [16384, 32768) : audio - highest priority 2139 * [32768, 49152) : whiteboard - medium priority 2140 * [49152, 65536) : video - low priority 2141 * 2142 * Everything else gets lowest priority. 2143 */ 2144 if (ip->ip_p == IPPROTO_UDP) { 2145 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 2146 switch (ntohs(udp->uh_dport) & 0xc000) { 2147 case 0x4000: 2148 prio = 70; 2149 break; 2150 case 0x8000: 2151 prio = 60; 2152 break; 2153 case 0xc000: 2154 prio = 55; 2155 break; 2156 } 2157 } 2158 return prio; 2159 } 2160 2161 /* 2162 * End of token bucket filter modifications 2163 */ 2164 2165 static int 2166 X_ip_rsvp_vif(struct socket *so, struct sockopt *sopt) 2167 { 2168 int error, vifi; 2169 2170 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2171 return EOPNOTSUPP; 2172 2173 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi); 2174 if (error) 2175 return error; 2176 2177 VIF_LOCK(); 2178 2179 if (vifi < 0 || vifi >= numvifs) { /* Error if vif is invalid */ 2180 VIF_UNLOCK(); 2181 return EADDRNOTAVAIL; 2182 } 2183 2184 if (sopt->sopt_name == IP_RSVP_VIF_ON) { 2185 /* Check if socket is available. */ 2186 if (viftable[vifi].v_rsvpd != NULL) { 2187 VIF_UNLOCK(); 2188 return EADDRINUSE; 2189 } 2190 2191 viftable[vifi].v_rsvpd = so; 2192 /* This may seem silly, but we need to be sure we don't over-increment 2193 * the RSVP counter, in case something slips up. 2194 */ 2195 if (!viftable[vifi].v_rsvp_on) { 2196 viftable[vifi].v_rsvp_on = 1; 2197 rsvp_on++; 2198 } 2199 } else { /* must be VIF_OFF */ 2200 /* 2201 * XXX as an additional consistency check, one could make sure 2202 * that viftable[vifi].v_rsvpd == so, otherwise passing so as 2203 * first parameter is pretty useless. 2204 */ 2205 viftable[vifi].v_rsvpd = NULL; 2206 /* 2207 * This may seem silly, but we need to be sure we don't over-decrement 2208 * the RSVP counter, in case something slips up. 2209 */ 2210 if (viftable[vifi].v_rsvp_on) { 2211 viftable[vifi].v_rsvp_on = 0; 2212 rsvp_on--; 2213 } 2214 } 2215 VIF_UNLOCK(); 2216 return 0; 2217 } 2218 2219 static void 2220 X_ip_rsvp_force_done(struct socket *so) 2221 { 2222 int vifi; 2223 2224 /* Don't bother if it is not the right type of socket. */ 2225 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2226 return; 2227 2228 VIF_LOCK(); 2229 2230 /* The socket may be attached to more than one vif...this 2231 * is perfectly legal. 2232 */ 2233 for (vifi = 0; vifi < numvifs; vifi++) { 2234 if (viftable[vifi].v_rsvpd == so) { 2235 viftable[vifi].v_rsvpd = NULL; 2236 /* This may seem silly, but we need to be sure we don't 2237 * over-decrement the RSVP counter, in case something slips up. 2238 */ 2239 if (viftable[vifi].v_rsvp_on) { 2240 viftable[vifi].v_rsvp_on = 0; 2241 rsvp_on--; 2242 } 2243 } 2244 } 2245 2246 VIF_UNLOCK(); 2247 } 2248 2249 static void 2250 X_rsvp_input(struct mbuf *m, int off) 2251 { 2252 int vifi; 2253 struct ip *ip = mtod(m, struct ip *); 2254 struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET }; 2255 struct ifnet *ifp; 2256 2257 if (rsvpdebug) 2258 printf("rsvp_input: rsvp_on %d\n",rsvp_on); 2259 2260 /* Can still get packets with rsvp_on = 0 if there is a local member 2261 * of the group to which the RSVP packet is addressed. But in this 2262 * case we want to throw the packet away. 2263 */ 2264 if (!rsvp_on) { 2265 m_freem(m); 2266 return; 2267 } 2268 2269 if (rsvpdebug) 2270 printf("rsvp_input: check vifs\n"); 2271 2272 #ifdef DIAGNOSTIC 2273 M_ASSERTPKTHDR(m); 2274 #endif 2275 2276 ifp = m->m_pkthdr.rcvif; 2277 2278 VIF_LOCK(); 2279 /* Find which vif the packet arrived on. */ 2280 for (vifi = 0; vifi < numvifs; vifi++) 2281 if (viftable[vifi].v_ifp == ifp) 2282 break; 2283 2284 if (vifi == numvifs || viftable[vifi].v_rsvpd == NULL) { 2285 /* 2286 * Drop the lock here to avoid holding it across rip_input. 2287 * This could make rsvpdebug printfs wrong. If you care, 2288 * record the state of stuff before dropping the lock. 2289 */ 2290 VIF_UNLOCK(); 2291 /* 2292 * If the old-style non-vif-associated socket is set, 2293 * then use it. Otherwise, drop packet since there 2294 * is no specific socket for this vif. 2295 */ 2296 if (ip_rsvpd != NULL) { 2297 if (rsvpdebug) 2298 printf("rsvp_input: Sending packet up old-style socket\n"); 2299 rip_input(m, off); /* xxx */ 2300 } else { 2301 if (rsvpdebug && vifi == numvifs) 2302 printf("rsvp_input: Can't find vif for packet.\n"); 2303 else if (rsvpdebug && viftable[vifi].v_rsvpd == NULL) 2304 printf("rsvp_input: No socket defined for vif %d\n",vifi); 2305 m_freem(m); 2306 } 2307 return; 2308 } 2309 rsvp_src.sin_addr = ip->ip_src; 2310 2311 if (rsvpdebug && m) 2312 printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n", 2313 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv))); 2314 2315 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) { 2316 if (rsvpdebug) 2317 printf("rsvp_input: Failed to append to socket\n"); 2318 } else { 2319 if (rsvpdebug) 2320 printf("rsvp_input: send packet up\n"); 2321 } 2322 VIF_UNLOCK(); 2323 } 2324 2325 /* 2326 * Code for bandwidth monitors 2327 */ 2328 2329 /* 2330 * Define common interface for timeval-related methods 2331 */ 2332 #define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp) 2333 #define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp)) 2334 #define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp)) 2335 2336 static uint32_t 2337 compute_bw_meter_flags(struct bw_upcall *req) 2338 { 2339 uint32_t flags = 0; 2340 2341 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS) 2342 flags |= BW_METER_UNIT_PACKETS; 2343 if (req->bu_flags & BW_UPCALL_UNIT_BYTES) 2344 flags |= BW_METER_UNIT_BYTES; 2345 if (req->bu_flags & BW_UPCALL_GEQ) 2346 flags |= BW_METER_GEQ; 2347 if (req->bu_flags & BW_UPCALL_LEQ) 2348 flags |= BW_METER_LEQ; 2349 2350 return flags; 2351 } 2352 2353 /* 2354 * Add a bw_meter entry 2355 */ 2356 static int 2357 add_bw_upcall(struct bw_upcall *req) 2358 { 2359 struct mfc *mfc; 2360 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC, 2361 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC }; 2362 struct timeval now; 2363 struct bw_meter *x; 2364 uint32_t flags; 2365 2366 if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) 2367 return EOPNOTSUPP; 2368 2369 /* Test if the flags are valid */ 2370 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES))) 2371 return EINVAL; 2372 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))) 2373 return EINVAL; 2374 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 2375 == (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 2376 return EINVAL; 2377 2378 /* Test if the threshold time interval is valid */ 2379 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <)) 2380 return EINVAL; 2381 2382 flags = compute_bw_meter_flags(req); 2383 2384 /* 2385 * Find if we have already same bw_meter entry 2386 */ 2387 MFC_LOCK(); 2388 mfc = mfc_find(req->bu_src.s_addr, req->bu_dst.s_addr); 2389 if (mfc == NULL) { 2390 MFC_UNLOCK(); 2391 return EADDRNOTAVAIL; 2392 } 2393 for (x = mfc->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) { 2394 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 2395 &req->bu_threshold.b_time, ==)) && 2396 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 2397 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 2398 (x->bm_flags & BW_METER_USER_FLAGS) == flags) { 2399 MFC_UNLOCK(); 2400 return 0; /* XXX Already installed */ 2401 } 2402 } 2403 2404 /* Allocate the new bw_meter entry */ 2405 x = (struct bw_meter *)malloc(sizeof(*x), M_BWMETER, M_NOWAIT); 2406 if (x == NULL) { 2407 MFC_UNLOCK(); 2408 return ENOBUFS; 2409 } 2410 2411 /* Set the new bw_meter entry */ 2412 x->bm_threshold.b_time = req->bu_threshold.b_time; 2413 GET_TIME(now); 2414 x->bm_start_time = now; 2415 x->bm_threshold.b_packets = req->bu_threshold.b_packets; 2416 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes; 2417 x->bm_measured.b_packets = 0; 2418 x->bm_measured.b_bytes = 0; 2419 x->bm_flags = flags; 2420 x->bm_time_next = NULL; 2421 x->bm_time_hash = BW_METER_BUCKETS; 2422 2423 /* Add the new bw_meter entry to the front of entries for this MFC */ 2424 x->bm_mfc = mfc; 2425 x->bm_mfc_next = mfc->mfc_bw_meter; 2426 mfc->mfc_bw_meter = x; 2427 schedule_bw_meter(x, &now); 2428 MFC_UNLOCK(); 2429 2430 return 0; 2431 } 2432 2433 static void 2434 free_bw_list(struct bw_meter *list) 2435 { 2436 while (list != NULL) { 2437 struct bw_meter *x = list; 2438 2439 list = list->bm_mfc_next; 2440 unschedule_bw_meter(x); 2441 free(x, M_BWMETER); 2442 } 2443 } 2444 2445 /* 2446 * Delete one or multiple bw_meter entries 2447 */ 2448 static int 2449 del_bw_upcall(struct bw_upcall *req) 2450 { 2451 struct mfc *mfc; 2452 struct bw_meter *x; 2453 2454 if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) 2455 return EOPNOTSUPP; 2456 2457 MFC_LOCK(); 2458 /* Find the corresponding MFC entry */ 2459 mfc = mfc_find(req->bu_src.s_addr, req->bu_dst.s_addr); 2460 if (mfc == NULL) { 2461 MFC_UNLOCK(); 2462 return EADDRNOTAVAIL; 2463 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) { 2464 /* 2465 * Delete all bw_meter entries for this mfc 2466 */ 2467 struct bw_meter *list; 2468 2469 list = mfc->mfc_bw_meter; 2470 mfc->mfc_bw_meter = NULL; 2471 free_bw_list(list); 2472 MFC_UNLOCK(); 2473 return 0; 2474 } else { /* Delete a single bw_meter entry */ 2475 struct bw_meter *prev; 2476 uint32_t flags = 0; 2477 2478 flags = compute_bw_meter_flags(req); 2479 2480 /* Find the bw_meter entry to delete */ 2481 for (prev = NULL, x = mfc->mfc_bw_meter; x != NULL; 2482 x = x->bm_mfc_next) { 2483 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 2484 &req->bu_threshold.b_time, ==)) && 2485 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 2486 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 2487 (x->bm_flags & BW_METER_USER_FLAGS) == flags) 2488 break; 2489 } 2490 if (x != NULL) { /* Delete entry from the list for this MFC */ 2491 if (prev != NULL) 2492 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/ 2493 else 2494 x->bm_mfc->mfc_bw_meter = x->bm_mfc_next;/* new head of list */ 2495 2496 unschedule_bw_meter(x); 2497 MFC_UNLOCK(); 2498 /* Free the bw_meter entry */ 2499 free(x, M_BWMETER); 2500 return 0; 2501 } else { 2502 MFC_UNLOCK(); 2503 return EINVAL; 2504 } 2505 } 2506 /* NOTREACHED */ 2507 } 2508 2509 /* 2510 * Perform bandwidth measurement processing that may result in an upcall 2511 */ 2512 static void 2513 bw_meter_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp) 2514 { 2515 struct timeval delta; 2516 2517 MFC_LOCK_ASSERT(); 2518 2519 delta = *nowp; 2520 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2521 2522 if (x->bm_flags & BW_METER_GEQ) { 2523 /* 2524 * Processing for ">=" type of bw_meter entry 2525 */ 2526 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 2527 /* Reset the bw_meter entry */ 2528 x->bm_start_time = *nowp; 2529 x->bm_measured.b_packets = 0; 2530 x->bm_measured.b_bytes = 0; 2531 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2532 } 2533 2534 /* Record that a packet is received */ 2535 x->bm_measured.b_packets++; 2536 x->bm_measured.b_bytes += plen; 2537 2538 /* 2539 * Test if we should deliver an upcall 2540 */ 2541 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) { 2542 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2543 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) || 2544 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2545 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) { 2546 /* Prepare an upcall for delivery */ 2547 bw_meter_prepare_upcall(x, nowp); 2548 x->bm_flags |= BW_METER_UPCALL_DELIVERED; 2549 } 2550 } 2551 } else if (x->bm_flags & BW_METER_LEQ) { 2552 /* 2553 * Processing for "<=" type of bw_meter entry 2554 */ 2555 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 2556 /* 2557 * We are behind time with the multicast forwarding table 2558 * scanning for "<=" type of bw_meter entries, so test now 2559 * if we should deliver an upcall. 2560 */ 2561 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2562 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2563 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2564 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2565 /* Prepare an upcall for delivery */ 2566 bw_meter_prepare_upcall(x, nowp); 2567 } 2568 /* Reschedule the bw_meter entry */ 2569 unschedule_bw_meter(x); 2570 schedule_bw_meter(x, nowp); 2571 } 2572 2573 /* Record that a packet is received */ 2574 x->bm_measured.b_packets++; 2575 x->bm_measured.b_bytes += plen; 2576 2577 /* 2578 * Test if we should restart the measuring interval 2579 */ 2580 if ((x->bm_flags & BW_METER_UNIT_PACKETS && 2581 x->bm_measured.b_packets <= x->bm_threshold.b_packets) || 2582 (x->bm_flags & BW_METER_UNIT_BYTES && 2583 x->bm_measured.b_bytes <= x->bm_threshold.b_bytes)) { 2584 /* Don't restart the measuring interval */ 2585 } else { 2586 /* Do restart the measuring interval */ 2587 /* 2588 * XXX: note that we don't unschedule and schedule, because this 2589 * might be too much overhead per packet. Instead, when we process 2590 * all entries for a given timer hash bin, we check whether it is 2591 * really a timeout. If not, we reschedule at that time. 2592 */ 2593 x->bm_start_time = *nowp; 2594 x->bm_measured.b_packets = 0; 2595 x->bm_measured.b_bytes = 0; 2596 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2597 } 2598 } 2599 } 2600 2601 /* 2602 * Prepare a bandwidth-related upcall 2603 */ 2604 static void 2605 bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp) 2606 { 2607 struct timeval delta; 2608 struct bw_upcall *u; 2609 2610 MFC_LOCK_ASSERT(); 2611 2612 /* 2613 * Compute the measured time interval 2614 */ 2615 delta = *nowp; 2616 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2617 2618 /* 2619 * If there are too many pending upcalls, deliver them now 2620 */ 2621 if (bw_upcalls_n >= BW_UPCALLS_MAX) 2622 bw_upcalls_send(); 2623 2624 /* 2625 * Set the bw_upcall entry 2626 */ 2627 u = &bw_upcalls[bw_upcalls_n++]; 2628 u->bu_src = x->bm_mfc->mfc_origin; 2629 u->bu_dst = x->bm_mfc->mfc_mcastgrp; 2630 u->bu_threshold.b_time = x->bm_threshold.b_time; 2631 u->bu_threshold.b_packets = x->bm_threshold.b_packets; 2632 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes; 2633 u->bu_measured.b_time = delta; 2634 u->bu_measured.b_packets = x->bm_measured.b_packets; 2635 u->bu_measured.b_bytes = x->bm_measured.b_bytes; 2636 u->bu_flags = 0; 2637 if (x->bm_flags & BW_METER_UNIT_PACKETS) 2638 u->bu_flags |= BW_UPCALL_UNIT_PACKETS; 2639 if (x->bm_flags & BW_METER_UNIT_BYTES) 2640 u->bu_flags |= BW_UPCALL_UNIT_BYTES; 2641 if (x->bm_flags & BW_METER_GEQ) 2642 u->bu_flags |= BW_UPCALL_GEQ; 2643 if (x->bm_flags & BW_METER_LEQ) 2644 u->bu_flags |= BW_UPCALL_LEQ; 2645 } 2646 2647 /* 2648 * Send the pending bandwidth-related upcalls 2649 */ 2650 static void 2651 bw_upcalls_send(void) 2652 { 2653 struct mbuf *m; 2654 int len = bw_upcalls_n * sizeof(bw_upcalls[0]); 2655 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2656 static struct igmpmsg igmpmsg = { 0, /* unused1 */ 2657 0, /* unused2 */ 2658 IGMPMSG_BW_UPCALL,/* im_msgtype */ 2659 0, /* im_mbz */ 2660 0, /* im_vif */ 2661 0, /* unused3 */ 2662 { 0 }, /* im_src */ 2663 { 0 } }; /* im_dst */ 2664 2665 MFC_LOCK_ASSERT(); 2666 2667 if (bw_upcalls_n == 0) 2668 return; /* No pending upcalls */ 2669 2670 bw_upcalls_n = 0; 2671 2672 /* 2673 * Allocate a new mbuf, initialize it with the header and 2674 * the payload for the pending calls. 2675 */ 2676 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2677 if (m == NULL) { 2678 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n"); 2679 return; 2680 } 2681 2682 m->m_len = m->m_pkthdr.len = 0; 2683 m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg); 2684 m_copyback(m, sizeof(struct igmpmsg), len, (caddr_t)&bw_upcalls[0]); 2685 2686 /* 2687 * Send the upcalls 2688 * XXX do we need to set the address in k_igmpsrc ? 2689 */ 2690 mrtstat.mrts_upcalls++; 2691 if (socket_send(ip_mrouter, m, &k_igmpsrc) < 0) { 2692 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n"); 2693 ++mrtstat.mrts_upq_sockfull; 2694 } 2695 } 2696 2697 /* 2698 * Compute the timeout hash value for the bw_meter entries 2699 */ 2700 #define BW_METER_TIMEHASH(bw_meter, hash) \ 2701 do { \ 2702 struct timeval next_timeval = (bw_meter)->bm_start_time; \ 2703 \ 2704 BW_TIMEVALADD(&next_timeval, &(bw_meter)->bm_threshold.b_time); \ 2705 (hash) = next_timeval.tv_sec; \ 2706 if (next_timeval.tv_usec) \ 2707 (hash)++; /* XXX: make sure we don't timeout early */ \ 2708 (hash) %= BW_METER_BUCKETS; \ 2709 } while (0) 2710 2711 /* 2712 * Schedule a timer to process periodically bw_meter entry of type "<=" 2713 * by linking the entry in the proper hash bucket. 2714 */ 2715 static void 2716 schedule_bw_meter(struct bw_meter *x, struct timeval *nowp) 2717 { 2718 int time_hash; 2719 2720 MFC_LOCK_ASSERT(); 2721 2722 if (!(x->bm_flags & BW_METER_LEQ)) 2723 return; /* XXX: we schedule timers only for "<=" entries */ 2724 2725 /* 2726 * Reset the bw_meter entry 2727 */ 2728 x->bm_start_time = *nowp; 2729 x->bm_measured.b_packets = 0; 2730 x->bm_measured.b_bytes = 0; 2731 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2732 2733 /* 2734 * Compute the timeout hash value and insert the entry 2735 */ 2736 BW_METER_TIMEHASH(x, time_hash); 2737 x->bm_time_next = bw_meter_timers[time_hash]; 2738 bw_meter_timers[time_hash] = x; 2739 x->bm_time_hash = time_hash; 2740 } 2741 2742 /* 2743 * Unschedule the periodic timer that processes bw_meter entry of type "<=" 2744 * by removing the entry from the proper hash bucket. 2745 */ 2746 static void 2747 unschedule_bw_meter(struct bw_meter *x) 2748 { 2749 int time_hash; 2750 struct bw_meter *prev, *tmp; 2751 2752 MFC_LOCK_ASSERT(); 2753 2754 if (!(x->bm_flags & BW_METER_LEQ)) 2755 return; /* XXX: we schedule timers only for "<=" entries */ 2756 2757 /* 2758 * Compute the timeout hash value and delete the entry 2759 */ 2760 time_hash = x->bm_time_hash; 2761 if (time_hash >= BW_METER_BUCKETS) 2762 return; /* Entry was not scheduled */ 2763 2764 for (prev = NULL, tmp = bw_meter_timers[time_hash]; 2765 tmp != NULL; prev = tmp, tmp = tmp->bm_time_next) 2766 if (tmp == x) 2767 break; 2768 2769 if (tmp == NULL) 2770 panic("unschedule_bw_meter: bw_meter entry not found"); 2771 2772 if (prev != NULL) 2773 prev->bm_time_next = x->bm_time_next; 2774 else 2775 bw_meter_timers[time_hash] = x->bm_time_next; 2776 2777 x->bm_time_next = NULL; 2778 x->bm_time_hash = BW_METER_BUCKETS; 2779 } 2780 2781 2782 /* 2783 * Process all "<=" type of bw_meter that should be processed now, 2784 * and for each entry prepare an upcall if necessary. Each processed 2785 * entry is rescheduled again for the (periodic) processing. 2786 * 2787 * This is run periodically (once per second normally). On each round, 2788 * all the potentially matching entries are in the hash slot that we are 2789 * looking at. 2790 */ 2791 static void 2792 bw_meter_process() 2793 { 2794 static uint32_t last_tv_sec; /* last time we processed this */ 2795 2796 uint32_t loops; 2797 int i; 2798 struct timeval now, process_endtime; 2799 2800 GET_TIME(now); 2801 if (last_tv_sec == now.tv_sec) 2802 return; /* nothing to do */ 2803 2804 loops = now.tv_sec - last_tv_sec; 2805 last_tv_sec = now.tv_sec; 2806 if (loops > BW_METER_BUCKETS) 2807 loops = BW_METER_BUCKETS; 2808 2809 MFC_LOCK(); 2810 /* 2811 * Process all bins of bw_meter entries from the one after the last 2812 * processed to the current one. On entry, i points to the last bucket 2813 * visited, so we need to increment i at the beginning of the loop. 2814 */ 2815 for (i = (now.tv_sec - loops) % BW_METER_BUCKETS; loops > 0; loops--) { 2816 struct bw_meter *x, *tmp_list; 2817 2818 if (++i >= BW_METER_BUCKETS) 2819 i = 0; 2820 2821 /* Disconnect the list of bw_meter entries from the bin */ 2822 tmp_list = bw_meter_timers[i]; 2823 bw_meter_timers[i] = NULL; 2824 2825 /* Process the list of bw_meter entries */ 2826 while (tmp_list != NULL) { 2827 x = tmp_list; 2828 tmp_list = tmp_list->bm_time_next; 2829 2830 /* Test if the time interval is over */ 2831 process_endtime = x->bm_start_time; 2832 BW_TIMEVALADD(&process_endtime, &x->bm_threshold.b_time); 2833 if (BW_TIMEVALCMP(&process_endtime, &now, >)) { 2834 /* Not yet: reschedule, but don't reset */ 2835 int time_hash; 2836 2837 BW_METER_TIMEHASH(x, time_hash); 2838 if (time_hash == i && process_endtime.tv_sec == now.tv_sec) { 2839 /* 2840 * XXX: somehow the bin processing is a bit ahead of time. 2841 * Put the entry in the next bin. 2842 */ 2843 if (++time_hash >= BW_METER_BUCKETS) 2844 time_hash = 0; 2845 } 2846 x->bm_time_next = bw_meter_timers[time_hash]; 2847 bw_meter_timers[time_hash] = x; 2848 x->bm_time_hash = time_hash; 2849 2850 continue; 2851 } 2852 2853 /* 2854 * Test if we should deliver an upcall 2855 */ 2856 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2857 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2858 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2859 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2860 /* Prepare an upcall for delivery */ 2861 bw_meter_prepare_upcall(x, &now); 2862 } 2863 2864 /* 2865 * Reschedule for next processing 2866 */ 2867 schedule_bw_meter(x, &now); 2868 } 2869 } 2870 2871 /* Send all upcalls that are pending delivery */ 2872 bw_upcalls_send(); 2873 2874 MFC_UNLOCK(); 2875 } 2876 2877 /* 2878 * A periodic function for sending all upcalls that are pending delivery 2879 */ 2880 static void 2881 expire_bw_upcalls_send(void *unused) 2882 { 2883 MFC_LOCK(); 2884 bw_upcalls_send(); 2885 MFC_UNLOCK(); 2886 2887 callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, 2888 expire_bw_upcalls_send, NULL); 2889 } 2890 2891 /* 2892 * A periodic function for periodic scanning of the multicast forwarding 2893 * table for processing all "<=" bw_meter entries. 2894 */ 2895 static void 2896 expire_bw_meter_process(void *unused) 2897 { 2898 if (mrt_api_config & MRT_MFC_BW_UPCALL) 2899 bw_meter_process(); 2900 2901 callout_reset(&bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, NULL); 2902 } 2903 2904 /* 2905 * End of bandwidth monitoring code 2906 */ 2907 2908 #ifdef PIM 2909 /* 2910 * Send the packet up to the user daemon, or eventually do kernel encapsulation 2911 * 2912 */ 2913 static int 2914 pim_register_send(struct ip *ip, struct vif *vifp, 2915 struct mbuf *m, struct mfc *rt) 2916 { 2917 struct mbuf *mb_copy, *mm; 2918 2919 if (mrtdebug & DEBUG_PIM) 2920 log(LOG_DEBUG, "pim_register_send: "); 2921 2922 mb_copy = pim_register_prepare(ip, m); 2923 if (mb_copy == NULL) 2924 return ENOBUFS; 2925 2926 /* 2927 * Send all the fragments. Note that the mbuf for each fragment 2928 * is freed by the sending machinery. 2929 */ 2930 for (mm = mb_copy; mm; mm = mb_copy) { 2931 mb_copy = mm->m_nextpkt; 2932 mm->m_nextpkt = 0; 2933 mm = m_pullup(mm, sizeof(struct ip)); 2934 if (mm != NULL) { 2935 ip = mtod(mm, struct ip *); 2936 if ((mrt_api_config & MRT_MFC_RP) && 2937 (rt->mfc_rp.s_addr != INADDR_ANY)) { 2938 pim_register_send_rp(ip, vifp, mm, rt); 2939 } else { 2940 pim_register_send_upcall(ip, vifp, mm, rt); 2941 } 2942 } 2943 } 2944 2945 return 0; 2946 } 2947 2948 /* 2949 * Return a copy of the data packet that is ready for PIM Register 2950 * encapsulation. 2951 * XXX: Note that in the returned copy the IP header is a valid one. 2952 */ 2953 static struct mbuf * 2954 pim_register_prepare(struct ip *ip, struct mbuf *m) 2955 { 2956 struct mbuf *mb_copy = NULL; 2957 int mtu; 2958 2959 /* Take care of delayed checksums */ 2960 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 2961 in_delayed_cksum(m); 2962 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 2963 } 2964 2965 /* 2966 * Copy the old packet & pullup its IP header into the 2967 * new mbuf so we can modify it. 2968 */ 2969 mb_copy = m_copypacket(m, M_DONTWAIT); 2970 if (mb_copy == NULL) 2971 return NULL; 2972 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2); 2973 if (mb_copy == NULL) 2974 return NULL; 2975 2976 /* take care of the TTL */ 2977 ip = mtod(mb_copy, struct ip *); 2978 --ip->ip_ttl; 2979 2980 /* Compute the MTU after the PIM Register encapsulation */ 2981 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr); 2982 2983 if (ip->ip_len <= mtu) { 2984 /* Turn the IP header into a valid one */ 2985 ip->ip_len = htons(ip->ip_len); 2986 ip->ip_off = htons(ip->ip_off); 2987 ip->ip_sum = 0; 2988 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 2989 } else { 2990 /* Fragment the packet */ 2991 if (ip_fragment(ip, &mb_copy, mtu, 0, CSUM_DELAY_IP) != 0) { 2992 m_freem(mb_copy); 2993 return NULL; 2994 } 2995 } 2996 return mb_copy; 2997 } 2998 2999 /* 3000 * Send an upcall with the data packet to the user-level process. 3001 */ 3002 static int 3003 pim_register_send_upcall(struct ip *ip, struct vif *vifp, 3004 struct mbuf *mb_copy, struct mfc *rt) 3005 { 3006 struct mbuf *mb_first; 3007 int len = ntohs(ip->ip_len); 3008 struct igmpmsg *im; 3009 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 3010 3011 VIF_LOCK_ASSERT(); 3012 3013 /* 3014 * Add a new mbuf with an upcall header 3015 */ 3016 MGETHDR(mb_first, M_DONTWAIT, MT_HEADER); 3017 if (mb_first == NULL) { 3018 m_freem(mb_copy); 3019 return ENOBUFS; 3020 } 3021 mb_first->m_data += max_linkhdr; 3022 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg); 3023 mb_first->m_len = sizeof(struct igmpmsg); 3024 mb_first->m_next = mb_copy; 3025 3026 /* Send message to routing daemon */ 3027 im = mtod(mb_first, struct igmpmsg *); 3028 im->im_msgtype = IGMPMSG_WHOLEPKT; 3029 im->im_mbz = 0; 3030 im->im_vif = vifp - viftable; 3031 im->im_src = ip->ip_src; 3032 im->im_dst = ip->ip_dst; 3033 3034 k_igmpsrc.sin_addr = ip->ip_src; 3035 3036 mrtstat.mrts_upcalls++; 3037 3038 if (socket_send(ip_mrouter, mb_first, &k_igmpsrc) < 0) { 3039 if (mrtdebug & DEBUG_PIM) 3040 log(LOG_WARNING, 3041 "mcast: pim_register_send_upcall: ip_mrouter socket queue full"); 3042 ++mrtstat.mrts_upq_sockfull; 3043 return ENOBUFS; 3044 } 3045 3046 /* Keep statistics */ 3047 pimstat.pims_snd_registers_msgs++; 3048 pimstat.pims_snd_registers_bytes += len; 3049 3050 return 0; 3051 } 3052 3053 /* 3054 * Encapsulate the data packet in PIM Register message and send it to the RP. 3055 */ 3056 static int 3057 pim_register_send_rp(struct ip *ip, struct vif *vifp, 3058 struct mbuf *mb_copy, struct mfc *rt) 3059 { 3060 struct mbuf *mb_first; 3061 struct ip *ip_outer; 3062 struct pim_encap_pimhdr *pimhdr; 3063 int len = ntohs(ip->ip_len); 3064 vifi_t vifi = rt->mfc_parent; 3065 3066 VIF_LOCK_ASSERT(); 3067 3068 if ((vifi >= numvifs) || (viftable[vifi].v_lcl_addr.s_addr == 0)) { 3069 m_freem(mb_copy); 3070 return EADDRNOTAVAIL; /* The iif vif is invalid */ 3071 } 3072 3073 /* 3074 * Add a new mbuf with the encapsulating header 3075 */ 3076 MGETHDR(mb_first, M_DONTWAIT, MT_HEADER); 3077 if (mb_first == NULL) { 3078 m_freem(mb_copy); 3079 return ENOBUFS; 3080 } 3081 mb_first->m_data += max_linkhdr; 3082 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 3083 mb_first->m_next = mb_copy; 3084 3085 mb_first->m_pkthdr.len = len + mb_first->m_len; 3086 3087 /* 3088 * Fill in the encapsulating IP and PIM header 3089 */ 3090 ip_outer = mtod(mb_first, struct ip *); 3091 *ip_outer = pim_encap_iphdr; 3092 #ifdef RANDOM_IP_ID 3093 ip_outer->ip_id = ip_randomid(); 3094 #else 3095 ip_outer->ip_id = htons(ip_id++); 3096 #endif 3097 ip_outer->ip_len = len + sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 3098 ip_outer->ip_src = viftable[vifi].v_lcl_addr; 3099 ip_outer->ip_dst = rt->mfc_rp; 3100 /* 3101 * Copy the inner header TOS to the outer header, and take care of the 3102 * IP_DF bit. 3103 */ 3104 ip_outer->ip_tos = ip->ip_tos; 3105 if (ntohs(ip->ip_off) & IP_DF) 3106 ip_outer->ip_off |= IP_DF; 3107 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer 3108 + sizeof(pim_encap_iphdr)); 3109 *pimhdr = pim_encap_pimhdr; 3110 /* If the iif crosses a border, set the Border-bit */ 3111 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & mrt_api_config) 3112 pimhdr->flags |= htonl(PIM_BORDER_REGISTER); 3113 3114 mb_first->m_data += sizeof(pim_encap_iphdr); 3115 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr)); 3116 mb_first->m_data -= sizeof(pim_encap_iphdr); 3117 3118 if (vifp->v_rate_limit == 0) 3119 tbf_send_packet(vifp, mb_first); 3120 else 3121 tbf_control(vifp, mb_first, ip, ip_outer->ip_len); 3122 3123 /* Keep statistics */ 3124 pimstat.pims_snd_registers_msgs++; 3125 pimstat.pims_snd_registers_bytes += len; 3126 3127 return 0; 3128 } 3129 3130 /* 3131 * PIM-SMv2 and PIM-DM messages processing. 3132 * Receives and verifies the PIM control messages, and passes them 3133 * up to the listening socket, using rip_input(). 3134 * The only message with special processing is the PIM_REGISTER message 3135 * (used by PIM-SM): the PIM header is stripped off, and the inner packet 3136 * is passed to if_simloop(). 3137 */ 3138 void 3139 pim_input(struct mbuf *m, int off) 3140 { 3141 struct ip *ip = mtod(m, struct ip *); 3142 struct pim *pim; 3143 int minlen; 3144 int datalen = ip->ip_len; 3145 int ip_tos; 3146 int iphlen = off; 3147 3148 /* Keep statistics */ 3149 pimstat.pims_rcv_total_msgs++; 3150 pimstat.pims_rcv_total_bytes += datalen; 3151 3152 /* 3153 * Validate lengths 3154 */ 3155 if (datalen < PIM_MINLEN) { 3156 pimstat.pims_rcv_tooshort++; 3157 log(LOG_ERR, "pim_input: packet size too small %d from %lx\n", 3158 datalen, (u_long)ip->ip_src.s_addr); 3159 m_freem(m); 3160 return; 3161 } 3162 3163 /* 3164 * If the packet is at least as big as a REGISTER, go agead 3165 * and grab the PIM REGISTER header size, to avoid another 3166 * possible m_pullup() later. 3167 * 3168 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8 3169 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28 3170 */ 3171 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN); 3172 /* 3173 * Get the IP and PIM headers in contiguous memory, and 3174 * possibly the PIM REGISTER header. 3175 */ 3176 if ((m->m_flags & M_EXT || m->m_len < minlen) && 3177 (m = m_pullup(m, minlen)) == 0) { 3178 log(LOG_ERR, "pim_input: m_pullup failure\n"); 3179 return; 3180 } 3181 /* m_pullup() may have given us a new mbuf so reset ip. */ 3182 ip = mtod(m, struct ip *); 3183 ip_tos = ip->ip_tos; 3184 3185 /* adjust mbuf to point to the PIM header */ 3186 m->m_data += iphlen; 3187 m->m_len -= iphlen; 3188 pim = mtod(m, struct pim *); 3189 3190 /* 3191 * Validate checksum. If PIM REGISTER, exclude the data packet. 3192 * 3193 * XXX: some older PIMv2 implementations don't make this distinction, 3194 * so for compatibility reason perform the checksum over part of the 3195 * message, and if error, then over the whole message. 3196 */ 3197 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) { 3198 /* do nothing, checksum okay */ 3199 } else if (in_cksum(m, datalen)) { 3200 pimstat.pims_rcv_badsum++; 3201 if (mrtdebug & DEBUG_PIM) 3202 log(LOG_DEBUG, "pim_input: invalid checksum"); 3203 m_freem(m); 3204 return; 3205 } 3206 3207 /* PIM version check */ 3208 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) { 3209 pimstat.pims_rcv_badversion++; 3210 log(LOG_ERR, "pim_input: incorrect version %d, expecting %d\n", 3211 PIM_VT_V(pim->pim_vt), PIM_VERSION); 3212 m_freem(m); 3213 return; 3214 } 3215 3216 /* restore mbuf back to the outer IP */ 3217 m->m_data -= iphlen; 3218 m->m_len += iphlen; 3219 3220 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) { 3221 /* 3222 * Since this is a REGISTER, we'll make a copy of the register 3223 * headers ip + pim + u_int32 + encap_ip, to be passed up to the 3224 * routing daemon. 3225 */ 3226 struct sockaddr_in dst = { sizeof(dst), AF_INET }; 3227 struct mbuf *mcp; 3228 struct ip *encap_ip; 3229 u_int32_t *reghdr; 3230 struct ifnet *vifp; 3231 3232 VIF_LOCK(); 3233 if ((reg_vif_num >= numvifs) || (reg_vif_num == VIFI_INVALID)) { 3234 VIF_UNLOCK(); 3235 if (mrtdebug & DEBUG_PIM) 3236 log(LOG_DEBUG, 3237 "pim_input: register vif not set: %d\n", reg_vif_num); 3238 m_freem(m); 3239 return; 3240 } 3241 /* XXX need refcnt? */ 3242 vifp = viftable[reg_vif_num].v_ifp; 3243 VIF_UNLOCK(); 3244 3245 /* 3246 * Validate length 3247 */ 3248 if (datalen < PIM_REG_MINLEN) { 3249 pimstat.pims_rcv_tooshort++; 3250 pimstat.pims_rcv_badregisters++; 3251 log(LOG_ERR, 3252 "pim_input: register packet size too small %d from %lx\n", 3253 datalen, (u_long)ip->ip_src.s_addr); 3254 m_freem(m); 3255 return; 3256 } 3257 3258 reghdr = (u_int32_t *)(pim + 1); 3259 encap_ip = (struct ip *)(reghdr + 1); 3260 3261 if (mrtdebug & DEBUG_PIM) { 3262 log(LOG_DEBUG, 3263 "pim_input[register], encap_ip: %lx -> %lx, encap_ip len %d\n", 3264 (u_long)ntohl(encap_ip->ip_src.s_addr), 3265 (u_long)ntohl(encap_ip->ip_dst.s_addr), 3266 ntohs(encap_ip->ip_len)); 3267 } 3268 3269 /* verify the version number of the inner packet */ 3270 if (encap_ip->ip_v != IPVERSION) { 3271 pimstat.pims_rcv_badregisters++; 3272 if (mrtdebug & DEBUG_PIM) { 3273 log(LOG_DEBUG, "pim_input: invalid IP version (%d) " 3274 "of the inner packet\n", encap_ip->ip_v); 3275 } 3276 m_freem(m); 3277 return; 3278 } 3279 3280 /* verify the inner packet is destined to a mcast group */ 3281 if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) { 3282 pimstat.pims_rcv_badregisters++; 3283 if (mrtdebug & DEBUG_PIM) 3284 log(LOG_DEBUG, 3285 "pim_input: inner packet of register is not " 3286 "multicast %lx\n", 3287 (u_long)ntohl(encap_ip->ip_dst.s_addr)); 3288 m_freem(m); 3289 return; 3290 } 3291 3292 /* If a NULL_REGISTER, pass it to the daemon */ 3293 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 3294 goto pim_input_to_daemon; 3295 3296 /* 3297 * Copy the TOS from the outer IP header to the inner IP header. 3298 */ 3299 if (encap_ip->ip_tos != ip_tos) { 3300 /* Outer TOS -> inner TOS */ 3301 encap_ip->ip_tos = ip_tos; 3302 /* Recompute the inner header checksum. Sigh... */ 3303 3304 /* adjust mbuf to point to the inner IP header */ 3305 m->m_data += (iphlen + PIM_MINLEN); 3306 m->m_len -= (iphlen + PIM_MINLEN); 3307 3308 encap_ip->ip_sum = 0; 3309 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2); 3310 3311 /* restore mbuf to point back to the outer IP header */ 3312 m->m_data -= (iphlen + PIM_MINLEN); 3313 m->m_len += (iphlen + PIM_MINLEN); 3314 } 3315 3316 /* 3317 * Decapsulate the inner IP packet and loopback to forward it 3318 * as a normal multicast packet. Also, make a copy of the 3319 * outer_iphdr + pimhdr + reghdr + encap_iphdr 3320 * to pass to the daemon later, so it can take the appropriate 3321 * actions (e.g., send back PIM_REGISTER_STOP). 3322 * XXX: here m->m_data points to the outer IP header. 3323 */ 3324 mcp = m_copy(m, 0, iphlen + PIM_REG_MINLEN); 3325 if (mcp == NULL) { 3326 log(LOG_ERR, 3327 "pim_input: pim register: could not copy register head\n"); 3328 m_freem(m); 3329 return; 3330 } 3331 3332 /* Keep statistics */ 3333 /* XXX: registers_bytes include only the encap. mcast pkt */ 3334 pimstat.pims_rcv_registers_msgs++; 3335 pimstat.pims_rcv_registers_bytes += ntohs(encap_ip->ip_len); 3336 3337 /* 3338 * forward the inner ip packet; point m_data at the inner ip. 3339 */ 3340 m_adj(m, iphlen + PIM_MINLEN); 3341 3342 if (mrtdebug & DEBUG_PIM) { 3343 log(LOG_DEBUG, 3344 "pim_input: forwarding decapsulated register: " 3345 "src %lx, dst %lx, vif %d\n", 3346 (u_long)ntohl(encap_ip->ip_src.s_addr), 3347 (u_long)ntohl(encap_ip->ip_dst.s_addr), 3348 reg_vif_num); 3349 } 3350 /* NB: vifp was collected above; can it change on us? */ 3351 if_simloop(vifp, m, dst.sin_family, 0); 3352 3353 /* prepare the register head to send to the mrouting daemon */ 3354 m = mcp; 3355 } 3356 3357 pim_input_to_daemon: 3358 /* 3359 * Pass the PIM message up to the daemon; if it is a Register message, 3360 * pass the 'head' only up to the daemon. This includes the 3361 * outer IP header, PIM header, PIM-Register header and the 3362 * inner IP header. 3363 * XXX: the outer IP header pkt size of a Register is not adjust to 3364 * reflect the fact that the inner multicast data is truncated. 3365 */ 3366 rip_input(m, iphlen); 3367 3368 return; 3369 } 3370 #endif /* PIM */ 3371 3372 static int 3373 ip_mroute_modevent(module_t mod, int type, void *unused) 3374 { 3375 switch (type) { 3376 case MOD_LOAD: 3377 mtx_init(&mrouter_mtx, "mrouter initialization", NULL, MTX_DEF); 3378 MFC_LOCK_INIT(); 3379 VIF_LOCK_INIT(); 3380 ip_mrouter_reset(); 3381 ip_mcast_src = X_ip_mcast_src; 3382 ip_mforward = X_ip_mforward; 3383 ip_mrouter_done = X_ip_mrouter_done; 3384 ip_mrouter_get = X_ip_mrouter_get; 3385 ip_mrouter_set = X_ip_mrouter_set; 3386 ip_rsvp_force_done = X_ip_rsvp_force_done; 3387 ip_rsvp_vif = X_ip_rsvp_vif; 3388 legal_vif_num = X_legal_vif_num; 3389 mrt_ioctl = X_mrt_ioctl; 3390 rsvp_input_p = X_rsvp_input; 3391 break; 3392 3393 case MOD_UNLOAD: 3394 /* 3395 * Typically module unload happens after the user-level 3396 * process has shutdown the kernel services (the check 3397 * below insures someone can't just yank the module out 3398 * from under a running process). But if the module is 3399 * just loaded and then unloaded w/o starting up a user 3400 * process we still need to cleanup. 3401 */ 3402 if (ip_mrouter) 3403 return EINVAL; 3404 3405 X_ip_mrouter_done(); 3406 ip_mcast_src = NULL; 3407 ip_mforward = NULL; 3408 ip_mrouter_done = NULL; 3409 ip_mrouter_get = NULL; 3410 ip_mrouter_set = NULL; 3411 ip_rsvp_force_done = NULL; 3412 ip_rsvp_vif = NULL; 3413 legal_vif_num = NULL; 3414 mrt_ioctl = NULL; 3415 rsvp_input_p = NULL; 3416 VIF_LOCK_DESTROY(); 3417 MFC_LOCK_DESTROY(); 3418 mtx_destroy(&mrouter_mtx); 3419 break; 3420 } 3421 return 0; 3422 } 3423 3424 static moduledata_t ip_mroutemod = { 3425 "ip_mroute", 3426 ip_mroute_modevent, 3427 0 3428 }; 3429 DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 3430