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