ip_mroute.c revision 122323
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: head/sys/netinet/ip_mroute.c 122323 2003-11-08 22:51:18Z sam $ 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 */ 69static u_int rsvpdebug; /* non-zero enables debugging */ 70 71static 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 82static 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 93static struct mrtstat mrtstat; 94SYSCTL_STRUCT(_net_inet_ip, OID_AUTO, mrtstat, CTLFLAG_RW, 95 &mrtstat, mrtstat, 96 "Multicast Routing Statistics (struct mrtstat, netinet/ip_mroute.h)"); 97 98static struct mfc *mfctable[MFCTBLSIZ]; 99SYSCTL_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 103static 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 110static struct vif viftable[MAXVIFS]; 111SYSCTL_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 115static 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 122static u_char nexpire[MFCTBLSIZ]; 123 124static 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 134static 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 */ 145static 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 */ 151static 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 */ 168static 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 174static struct bw_meter *bw_meter_timers[BW_METER_BUCKETS]; 175static 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 */ 182static struct bw_upcall bw_upcalls[BW_UPCALLS_MAX]; 183static u_int bw_upcalls_n; /* # of pending upcalls */ 184static struct callout bw_upcalls_ch; 185#define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */ 186 187#ifdef PIM 188static struct pimstat pimstat; 189SYSCTL_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 204struct pim_encap_pimhdr { 205 struct pim pim; 206 uint32_t flags; 207}; 208 209static 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 226static 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 235static struct ifnet multicast_register_if; 236static vifi_t reg_vif_num = VIFI_INVALID; 237#endif /* PIM */ 238 239/* 240 * Private variables. 241 */ 242static vifi_t numvifs; 243static 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 */ 249static u_long last_encap_src; 250static struct vif *last_encap_vif; 251 252/* 253 * Callout for queue processing. 254 */ 255static struct callout tbf_reprocess_ch; 256 257static u_long X_ip_mcast_src(int vifi); 258static int X_ip_mforward(struct ip *ip, struct ifnet *ifp, 259 struct mbuf *m, struct ip_moptions *imo); 260static int X_ip_mrouter_done(void); 261static int X_ip_mrouter_get(struct socket *so, struct sockopt *m); 262static int X_ip_mrouter_set(struct socket *so, struct sockopt *m); 263static int X_legal_vif_num(int vif); 264static int X_mrt_ioctl(int cmd, caddr_t data); 265 266static int get_sg_cnt(struct sioc_sg_req *); 267static int get_vif_cnt(struct sioc_vif_req *); 268static int ip_mrouter_init(struct socket *, int); 269static int add_vif(struct vifctl *); 270static int del_vif(vifi_t); 271static int add_mfc(struct mfcctl2 *); 272static int del_mfc(struct mfcctl2 *); 273static int set_api_config(uint32_t *); /* chose API capabilities */ 274static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *); 275static int set_assert(int); 276static void expire_upcalls(void *); 277static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t); 278static void phyint_send(struct ip *, struct vif *, struct mbuf *); 279static void encap_send(struct ip *, struct vif *, struct mbuf *); 280static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long); 281static void tbf_queue(struct vif *, struct mbuf *); 282static void tbf_process_q(struct vif *); 283static void tbf_reprocess_q(void *); 284static int tbf_dq_sel(struct vif *, struct ip *); 285static void tbf_send_packet(struct vif *, struct mbuf *); 286static void tbf_update_tokens(struct vif *); 287static int priority(struct vif *, struct ip *); 288 289/* 290 * Bandwidth monitoring 291 */ 292static void free_bw_list(struct bw_meter *list); 293static int add_bw_upcall(struct bw_upcall *); 294static int del_bw_upcall(struct bw_upcall *); 295static void bw_meter_receive_packet(struct bw_meter *x, int plen, 296 struct timeval *nowp); 297static void bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp); 298static void bw_upcalls_send(void); 299static void schedule_bw_meter(struct bw_meter *x, struct timeval *nowp); 300static void unschedule_bw_meter(struct bw_meter *x); 301static void bw_meter_process(void); 302static void expire_bw_upcalls_send(void *); 303static void expire_bw_meter_process(void *); 304 305#ifdef PIM 306static int pim_register_send(struct ip *, struct vif *, 307 struct mbuf *, struct mfc *); 308static int pim_register_send_rp(struct ip *, struct vif *, 309 struct mbuf *, struct mfc *); 310static int pim_register_send_upcall(struct ip *, struct vif *, 311 struct mbuf *, struct mfc *); 312static struct mbuf *pim_register_prepare(struct ip *, struct mbuf *); 313#endif 314 315/* 316 * whether or not special PIM assert processing is enabled. 317 */ 318static 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 */ 329static 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); 333static 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 */ 347static struct mfc * 348mfc_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 */ 388static int 389X_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 */ 488static int 489X_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 */ 521static int 522X_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 */ 545static int 546get_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 */ 567static int 568get_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 587static void 588ip_mrouter_reset(void) 589{ 590 bzero((caddr_t)mfctable, sizeof(mfctable)); 591 MFC_LOCK_INIT(); 592 VIF_LOCK_INIT(); 593 bzero((caddr_t)nexpire, sizeof(nexpire)); 594 595 pim_assert = 0; 596 mrt_api_config = 0; 597 598 callout_init(&expire_upcalls_ch, CALLOUT_MPSAFE); 599 600 bw_upcalls_n = 0; 601 bzero((caddr_t)bw_meter_timers, sizeof(bw_meter_timers)); 602 callout_init(&bw_upcalls_ch, CALLOUT_MPSAFE); 603 callout_init(&bw_meter_ch, CALLOUT_MPSAFE); 604 605 callout_init(&tbf_reprocess_ch, CALLOUT_MPSAFE); 606} 607 608/* 609 * Enable multicast routing 610 */ 611static int 612ip_mrouter_init(struct socket *so, int version) 613{ 614 if (mrtdebug) 615 log(LOG_DEBUG, "ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 616 so->so_type, so->so_proto->pr_protocol); 617 618 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP) 619 return EOPNOTSUPP; 620 621 if (version != 1) 622 return ENOPROTOOPT; 623 624 if (ip_mrouter != NULL) 625 return EADDRINUSE; 626 627 ip_mrouter_reset(); 628 629 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, NULL); 630 631 callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, 632 expire_bw_upcalls_send, NULL); 633 callout_reset(&bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, NULL); 634 635 ip_mrouter = so; 636 637 if (mrtdebug) 638 log(LOG_DEBUG, "ip_mrouter_init\n"); 639 640 return 0; 641} 642 643/* 644 * Disable multicast routing 645 */ 646static int 647X_ip_mrouter_done(void) 648{ 649 vifi_t vifi; 650 int i; 651 struct ifnet *ifp; 652 struct ifreq ifr; 653 struct mfc *rt; 654 struct rtdetq *rte; 655 656 /* 657 * Detach/disable hooks to the reset of the system. 658 */ 659 ip_mrouter = NULL; 660 mrt_api_config = 0; 661 662 VIF_LOCK(); 663 if (encap_cookie) { 664 const struct encaptab *c = encap_cookie; 665 encap_cookie = NULL; 666 encap_detach(c); 667 } 668 VIF_UNLOCK(); 669 670 callout_stop(&tbf_reprocess_ch); 671 672 VIF_LOCK(); 673 /* 674 * For each phyint in use, disable promiscuous reception of all IP 675 * multicasts. 676 */ 677 for (vifi = 0; vifi < numvifs; vifi++) { 678 if (viftable[vifi].v_lcl_addr.s_addr != 0 && 679 !(viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) { 680 struct sockaddr_in *so = (struct sockaddr_in *)&(ifr.ifr_addr); 681 682 so->sin_len = sizeof(struct sockaddr_in); 683 so->sin_family = AF_INET; 684 so->sin_addr.s_addr = INADDR_ANY; 685 ifp = viftable[vifi].v_ifp; 686 if_allmulti(ifp, 0); 687 } 688 } 689 bzero((caddr_t)tbftable, sizeof(tbftable)); 690 bzero((caddr_t)viftable, sizeof(viftable)); 691 numvifs = 0; 692 pim_assert = 0; 693 VIF_LOCK_DESTROY(); 694 695 /* 696 * Free all multicast forwarding cache entries. 697 */ 698 callout_stop(&expire_upcalls_ch); 699 callout_stop(&bw_upcalls_ch); 700 callout_stop(&bw_meter_ch); 701 702 MFC_LOCK(); 703 for (i = 0; i < MFCTBLSIZ; i++) { 704 for (rt = mfctable[i]; rt != NULL; ) { 705 struct mfc *nr = rt->mfc_next; 706 707 for (rte = rt->mfc_stall; rte != NULL; ) { 708 struct rtdetq *n = rte->next; 709 710 m_freem(rte->m); 711 free(rte, M_MRTABLE); 712 rte = n; 713 } 714 free_bw_list(rt->mfc_bw_meter); 715 free(rt, M_MRTABLE); 716 rt = nr; 717 } 718 } 719 bzero((caddr_t)mfctable, sizeof(mfctable)); 720 bw_upcalls_n = 0; 721 bzero(bw_meter_timers, sizeof(bw_meter_timers)); 722 MFC_LOCK_DESTROY(); 723 724 /* 725 * Reset de-encapsulation cache 726 */ 727 last_encap_src = INADDR_ANY; 728 last_encap_vif = NULL; 729#ifdef PIM 730 reg_vif_num = VIFI_INVALID; 731#endif 732 733 if (mrtdebug) 734 log(LOG_DEBUG, "ip_mrouter_done\n"); 735 736 return 0; 737} 738 739/* 740 * Set PIM assert processing global 741 */ 742static int 743set_assert(int i) 744{ 745 if ((i != 1) && (i != 0)) 746 return EINVAL; 747 748 pim_assert = i; 749 750 return 0; 751} 752 753/* 754 * Configure API capabilities 755 */ 756int 757set_api_config(uint32_t *apival) 758{ 759 int i; 760 761 /* 762 * We can set the API capabilities only if it is the first operation 763 * after MRT_INIT. I.e.: 764 * - there are no vifs installed 765 * - pim_assert is not enabled 766 * - the MFC table is empty 767 */ 768 if (numvifs > 0) { 769 *apival = 0; 770 return EPERM; 771 } 772 if (pim_assert) { 773 *apival = 0; 774 return EPERM; 775 } 776 for (i = 0; i < MFCTBLSIZ; i++) { 777 if (mfctable[i] != NULL) { 778 *apival = 0; 779 return EPERM; 780 } 781 } 782 783 mrt_api_config = *apival & mrt_api_support; 784 *apival = mrt_api_config; 785 786 return 0; 787} 788 789/* 790 * Decide if a packet is from a tunnelled peer. 791 * Return 0 if not, 64 if so. XXX yuck.. 64 ??? 792 */ 793static int 794mroute_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 795{ 796 struct ip *ip = mtod(m, struct ip *); 797 int hlen = ip->ip_hl << 2; 798 799 /* 800 * don't claim the packet if it's not to a multicast destination or if 801 * we don't have an encapsulating tunnel with the source. 802 * Note: This code assumes that the remote site IP address 803 * uniquely identifies the tunnel (i.e., that this site has 804 * at most one tunnel with the remote site). 805 */ 806 if (!IN_MULTICAST(ntohl(((struct ip *)((char *)ip+hlen))->ip_dst.s_addr))) 807 return 0; 808 if (ip->ip_src.s_addr != last_encap_src) { 809 struct vif *vifp = viftable; 810 struct vif *vife = vifp + numvifs; 811 812 last_encap_src = ip->ip_src.s_addr; 813 last_encap_vif = NULL; 814 for ( ; vifp < vife; ++vifp) 815 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) { 816 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) == VIFF_TUNNEL) 817 last_encap_vif = vifp; 818 break; 819 } 820 } 821 if (last_encap_vif == NULL) { 822 last_encap_src = INADDR_ANY; 823 return 0; 824 } 825 return 64; 826} 827 828/* 829 * De-encapsulate a packet and feed it back through ip input (this 830 * routine is called whenever IP gets a packet that mroute_encap_func() 831 * claimed). 832 */ 833static void 834mroute_encap_input(struct mbuf *m, int off) 835{ 836 struct ip *ip = mtod(m, struct ip *); 837 int hlen = ip->ip_hl << 2; 838 839 if (hlen > sizeof(struct ip)) 840 ip_stripoptions(m, (struct mbuf *) 0); 841 m->m_data += sizeof(struct ip); 842 m->m_len -= sizeof(struct ip); 843 m->m_pkthdr.len -= sizeof(struct ip); 844 845 m->m_pkthdr.rcvif = last_encap_vif->v_ifp; 846 847 netisr_queue(NETISR_IP, m); 848 /* 849 * normally we would need a "schednetisr(NETISR_IP)" 850 * here but we were called by ip_input and it is going 851 * to loop back & try to dequeue the packet we just 852 * queued as soon as we return so we avoid the 853 * unnecessary software interrrupt. 854 * 855 * XXX 856 * This no longer holds - we may have direct-dispatched the packet, 857 * or there may be a queue processing limit. 858 */ 859} 860 861extern struct domain inetdomain; 862static struct protosw mroute_encap_protosw = 863{ SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR, 864 mroute_encap_input, 0, 0, rip_ctloutput, 865 0, 866 0, 0, 0, 0, 867 &rip_usrreqs 868}; 869 870/* 871 * Add a vif to the vif table 872 */ 873static int 874add_vif(struct vifctl *vifcp) 875{ 876 struct vif *vifp = viftable + vifcp->vifc_vifi; 877 struct sockaddr_in sin = {sizeof sin, AF_INET}; 878 struct ifaddr *ifa; 879 struct ifnet *ifp; 880 int error; 881 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi; 882 883 VIF_LOCK(); 884 if (vifcp->vifc_vifi >= MAXVIFS) { 885 VIF_UNLOCK(); 886 return EINVAL; 887 } 888 if (vifp->v_lcl_addr.s_addr != INADDR_ANY) { 889 VIF_UNLOCK(); 890 return EADDRINUSE; 891 } 892 if (vifcp->vifc_lcl_addr.s_addr == INADDR_ANY) { 893 VIF_UNLOCK(); 894 return EADDRNOTAVAIL; 895 } 896 897 /* Find the interface with an address in AF_INET family */ 898#ifdef PIM 899 if (vifcp->vifc_flags & VIFF_REGISTER) { 900 /* 901 * XXX: Because VIFF_REGISTER does not really need a valid 902 * local interface (e.g. it could be 127.0.0.2), we don't 903 * check its address. 904 */ 905 ifp = NULL; 906 } else 907#endif 908 { 909 sin.sin_addr = vifcp->vifc_lcl_addr; 910 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 911 if (ifa == NULL) { 912 VIF_UNLOCK(); 913 return EADDRNOTAVAIL; 914 } 915 ifp = ifa->ifa_ifp; 916 } 917 918 if (vifcp->vifc_flags & VIFF_TUNNEL) { 919 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) { 920 /* 921 * An encapsulating tunnel is wanted. Tell 922 * mroute_encap_input() to start paying attention 923 * to encapsulated packets. 924 */ 925 if (encap_cookie == NULL) { 926 int i; 927 928 encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV4, 929 mroute_encapcheck, 930 (struct protosw *)&mroute_encap_protosw, NULL); 931 932 if (encap_cookie == NULL) { 933 printf("ip_mroute: unable to attach encap\n"); 934 VIF_UNLOCK(); 935 return EIO; /* XXX */ 936 } 937 for (i = 0; i < MAXVIFS; ++i) { 938 if_initname(&multicast_decap_if[i], "mdecap", i); 939 } 940 } 941 /* 942 * Set interface to fake encapsulator interface 943 */ 944 ifp = &multicast_decap_if[vifcp->vifc_vifi]; 945 /* 946 * Prepare cached route entry 947 */ 948 bzero(&vifp->v_route, sizeof(vifp->v_route)); 949 } else { 950 log(LOG_ERR, "source routed tunnels not supported\n"); 951 VIF_UNLOCK(); 952 return EOPNOTSUPP; 953 } 954#ifdef PIM 955 } else if (vifcp->vifc_flags & VIFF_REGISTER) { 956 ifp = &multicast_register_if; 957 if (mrtdebug) 958 log(LOG_DEBUG, "Adding a register vif, ifp: %p\n", 959 (void *)&multicast_register_if); 960 if (reg_vif_num == VIFI_INVALID) { 961 if_initname(&multicast_register_if, "register_vif", 0); 962 multicast_register_if.if_flags = IFF_LOOPBACK; 963 bzero(&vifp->v_route, sizeof(vifp->v_route)); 964 reg_vif_num = vifcp->vifc_vifi; 965 } 966#endif 967 } else { /* Make sure the interface supports multicast */ 968 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 969 VIF_UNLOCK(); 970 return EOPNOTSUPP; 971 } 972 973 /* Enable promiscuous reception of all IP multicasts from the if */ 974 error = if_allmulti(ifp, 1); 975 if (error) { 976 VIF_UNLOCK(); 977 return error; 978 } 979 } 980 981 /* define parameters for the tbf structure */ 982 vifp->v_tbf = v_tbf; 983 GET_TIME(vifp->v_tbf->tbf_last_pkt_t); 984 vifp->v_tbf->tbf_n_tok = 0; 985 vifp->v_tbf->tbf_q_len = 0; 986 vifp->v_tbf->tbf_max_q_len = MAXQSIZE; 987 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL; 988 989 vifp->v_flags = vifcp->vifc_flags; 990 vifp->v_threshold = vifcp->vifc_threshold; 991 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 992 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 993 vifp->v_ifp = ifp; 994 /* scaling up here allows division by 1024 in critical code */ 995 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000; 996 vifp->v_rsvp_on = 0; 997 vifp->v_rsvpd = NULL; 998 /* initialize per vif pkt counters */ 999 vifp->v_pkt_in = 0; 1000 vifp->v_pkt_out = 0; 1001 vifp->v_bytes_in = 0; 1002 vifp->v_bytes_out = 0; 1003 1004 /* Adjust numvifs up if the vifi is higher than numvifs */ 1005 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1; 1006 1007 VIF_UNLOCK(); 1008 1009 if (mrtdebug) 1010 log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n", 1011 vifcp->vifc_vifi, 1012 (u_long)ntohl(vifcp->vifc_lcl_addr.s_addr), 1013 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 1014 (u_long)ntohl(vifcp->vifc_rmt_addr.s_addr), 1015 vifcp->vifc_threshold, 1016 vifcp->vifc_rate_limit); 1017 1018 return 0; 1019} 1020 1021/* 1022 * Delete a vif from the vif table 1023 */ 1024static int 1025del_vif(vifi_t vifi) 1026{ 1027 struct vif *vifp; 1028 1029 VIF_LOCK(); 1030 1031 if (vifi >= numvifs) { 1032 VIF_UNLOCK(); 1033 return EINVAL; 1034 } 1035 vifp = &viftable[vifi]; 1036 if (vifp->v_lcl_addr.s_addr == INADDR_ANY) { 1037 VIF_UNLOCK(); 1038 return EADDRNOTAVAIL; 1039 } 1040 1041 if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) 1042 if_allmulti(vifp->v_ifp, 0); 1043 1044 if (vifp == last_encap_vif) { 1045 last_encap_vif = NULL; 1046 last_encap_src = INADDR_ANY; 1047 } 1048 1049 /* 1050 * Free packets queued at the interface 1051 */ 1052 while (vifp->v_tbf->tbf_q) { 1053 struct mbuf *m = vifp->v_tbf->tbf_q; 1054 1055 vifp->v_tbf->tbf_q = m->m_act; 1056 m_freem(m); 1057 } 1058 1059#ifdef PIM 1060 if (vifp->v_flags & VIFF_REGISTER) 1061 reg_vif_num = VIFI_INVALID; 1062#endif 1063 1064 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf))); 1065 bzero((caddr_t)vifp, sizeof (*vifp)); 1066 1067 if (mrtdebug) 1068 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs); 1069 1070 /* Adjust numvifs down */ 1071 for (vifi = numvifs; vifi > 0; vifi--) 1072 if (viftable[vifi-1].v_lcl_addr.s_addr != INADDR_ANY) 1073 break; 1074 numvifs = vifi; 1075 1076 VIF_UNLOCK(); 1077 1078 return 0; 1079} 1080 1081/* 1082 * update an mfc entry without resetting counters and S,G addresses. 1083 */ 1084static void 1085update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 1086{ 1087 int i; 1088 1089 rt->mfc_parent = mfccp->mfcc_parent; 1090 for (i = 0; i < numvifs; i++) { 1091 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 1092 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & mrt_api_config & 1093 MRT_MFC_FLAGS_ALL; 1094 } 1095 /* set the RP address */ 1096 if (mrt_api_config & MRT_MFC_RP) 1097 rt->mfc_rp = mfccp->mfcc_rp; 1098 else 1099 rt->mfc_rp.s_addr = INADDR_ANY; 1100} 1101 1102/* 1103 * fully initialize an mfc entry from the parameter. 1104 */ 1105static void 1106init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 1107{ 1108 rt->mfc_origin = mfccp->mfcc_origin; 1109 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 1110 1111 update_mfc_params(rt, mfccp); 1112 1113 /* initialize pkt counters per src-grp */ 1114 rt->mfc_pkt_cnt = 0; 1115 rt->mfc_byte_cnt = 0; 1116 rt->mfc_wrong_if = 0; 1117 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 1118} 1119 1120 1121/* 1122 * Add an mfc entry 1123 */ 1124static int 1125add_mfc(struct mfcctl2 *mfccp) 1126{ 1127 struct mfc *rt; 1128 u_long hash; 1129 struct rtdetq *rte; 1130 u_short nstl; 1131 1132 VIF_LOCK(); 1133 MFC_LOCK(); 1134 1135 rt = mfc_find(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 1136 1137 /* If an entry already exists, just update the fields */ 1138 if (rt) { 1139 if (mrtdebug & DEBUG_MFC) 1140 log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n", 1141 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1142 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1143 mfccp->mfcc_parent); 1144 1145 update_mfc_params(rt, mfccp); 1146 MFC_UNLOCK(); 1147 VIF_UNLOCK(); 1148 return 0; 1149 } 1150 1151 /* 1152 * Find the entry for which the upcall was made and update 1153 */ 1154 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 1155 for (rt = mfctable[hash], nstl = 0; rt; rt = rt->mfc_next) { 1156 1157 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 1158 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) && 1159 (rt->mfc_stall != NULL)) { 1160 1161 if (nstl++) 1162 log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n", 1163 "multiple kernel entries", 1164 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1165 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1166 mfccp->mfcc_parent, (void *)rt->mfc_stall); 1167 1168 if (mrtdebug & DEBUG_MFC) 1169 log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n", 1170 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1171 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1172 mfccp->mfcc_parent, (void *)rt->mfc_stall); 1173 1174 init_mfc_params(rt, mfccp); 1175 1176 rt->mfc_expire = 0; /* Don't clean this guy up */ 1177 nexpire[hash]--; 1178 1179 /* free packets Qed at the end of this entry */ 1180 for (rte = rt->mfc_stall; rte != NULL; ) { 1181 struct rtdetq *n = rte->next; 1182 1183 ip_mdq(rte->m, rte->ifp, rt, -1); 1184 m_freem(rte->m); 1185 free(rte, M_MRTABLE); 1186 rte = n; 1187 } 1188 rt->mfc_stall = NULL; 1189 } 1190 } 1191 1192 /* 1193 * It is possible that an entry is being inserted without an upcall 1194 */ 1195 if (nstl == 0) { 1196 if (mrtdebug & DEBUG_MFC) 1197 log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n", 1198 hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1199 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1200 mfccp->mfcc_parent); 1201 1202 for (rt = mfctable[hash]; rt != NULL; rt = rt->mfc_next) { 1203 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 1204 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) { 1205 init_mfc_params(rt, mfccp); 1206 if (rt->mfc_expire) 1207 nexpire[hash]--; 1208 rt->mfc_expire = 0; 1209 break; /* XXX */ 1210 } 1211 } 1212 if (rt == NULL) { /* no upcall, so make a new entry */ 1213 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1214 if (rt == NULL) { 1215 MFC_UNLOCK(); 1216 VIF_UNLOCK(); 1217 return ENOBUFS; 1218 } 1219 1220 init_mfc_params(rt, mfccp); 1221 rt->mfc_expire = 0; 1222 rt->mfc_stall = NULL; 1223 1224 rt->mfc_bw_meter = NULL; 1225 /* insert new entry at head of hash chain */ 1226 rt->mfc_next = mfctable[hash]; 1227 mfctable[hash] = rt; 1228 } 1229 } 1230 MFC_UNLOCK(); 1231 VIF_UNLOCK(); 1232 return 0; 1233} 1234 1235/* 1236 * Delete an mfc entry 1237 */ 1238static int 1239del_mfc(struct mfcctl2 *mfccp) 1240{ 1241 struct in_addr origin; 1242 struct in_addr mcastgrp; 1243 struct mfc *rt; 1244 struct mfc **nptr; 1245 u_long hash; 1246 struct bw_meter *list; 1247 1248 origin = mfccp->mfcc_origin; 1249 mcastgrp = mfccp->mfcc_mcastgrp; 1250 1251 if (mrtdebug & DEBUG_MFC) 1252 log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n", 1253 (u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr)); 1254 1255 MFC_LOCK(); 1256 1257 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr); 1258 for (nptr = &mfctable[hash]; (rt = *nptr) != NULL; nptr = &rt->mfc_next) 1259 if (origin.s_addr == rt->mfc_origin.s_addr && 1260 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr && 1261 rt->mfc_stall == NULL) 1262 break; 1263 if (rt == NULL) { 1264 MFC_UNLOCK(); 1265 return EADDRNOTAVAIL; 1266 } 1267 1268 *nptr = rt->mfc_next; 1269 1270 /* 1271 * free the bw_meter entries 1272 */ 1273 list = rt->mfc_bw_meter; 1274 rt->mfc_bw_meter = NULL; 1275 1276 free(rt, M_MRTABLE); 1277 1278 free_bw_list(list); 1279 1280 MFC_UNLOCK(); 1281 1282 return 0; 1283} 1284 1285/* 1286 * Send a message to mrouted on the multicast routing socket 1287 */ 1288static int 1289socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src) 1290{ 1291 if (s) { 1292 mtx_lock(&Giant); /* XXX until sockets are locked */ 1293 if (sbappendaddr(&s->so_rcv, (struct sockaddr *)src, mm, NULL) != 0) { 1294 sorwakeup(s); 1295 mtx_unlock(&Giant); 1296 return 0; 1297 } 1298 mtx_unlock(&Giant); 1299 } 1300 m_freem(mm); 1301 return -1; 1302} 1303 1304/* 1305 * IP multicast forwarding function. This function assumes that the packet 1306 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1307 * pointed to by "ifp", and the packet is to be relayed to other networks 1308 * that have members of the packet's destination IP multicast group. 1309 * 1310 * The packet is returned unscathed to the caller, unless it is 1311 * erroneous, in which case a non-zero return value tells the caller to 1312 * discard it. 1313 */ 1314 1315#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1316 1317static int 1318X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m, 1319 struct ip_moptions *imo) 1320{ 1321 struct mfc *rt; 1322 int error; 1323 vifi_t vifi; 1324 1325 if (mrtdebug & DEBUG_FORWARD) 1326 log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n", 1327 (u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), 1328 (void *)ifp); 1329 1330 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 || 1331 ((u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1332 /* 1333 * Packet arrived via a physical interface or 1334 * an encapsulated tunnel or a register_vif. 1335 */ 1336 } else { 1337 /* 1338 * Packet arrived through a source-route tunnel. 1339 * Source-route tunnels are no longer supported. 1340 */ 1341 static int last_log; 1342 if (last_log != time_second) { 1343 last_log = time_second; 1344 log(LOG_ERR, 1345 "ip_mforward: received source-routed packet from %lx\n", 1346 (u_long)ntohl(ip->ip_src.s_addr)); 1347 } 1348 return 1; 1349 } 1350 1351 VIF_LOCK(); 1352 MFC_LOCK(); 1353 if (imo && ((vifi = imo->imo_multicast_vif) < numvifs)) { 1354 if (ip->ip_ttl < 255) 1355 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1356 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1357 struct vif *vifp = viftable + vifi; 1358 1359 printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s)\n", 1360 (long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr), 1361 vifi, 1362 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1363 vifp->v_ifp->if_xname); 1364 } 1365 error = ip_mdq(m, ifp, NULL, vifi); 1366 MFC_UNLOCK(); 1367 VIF_UNLOCK(); 1368 return error; 1369 } 1370 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1371 printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n", 1372 (long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr)); 1373 if (!imo) 1374 printf("In fact, no options were specified at all\n"); 1375 } 1376 1377 /* 1378 * Don't forward a packet with time-to-live of zero or one, 1379 * or a packet destined to a local-only group. 1380 */ 1381 if (ip->ip_ttl <= 1 || ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP) { 1382 MFC_UNLOCK(); 1383 VIF_UNLOCK(); 1384 return 0; 1385 } 1386 1387 /* 1388 * Determine forwarding vifs from the forwarding cache table 1389 */ 1390 ++mrtstat.mrts_mfc_lookups; 1391 rt = mfc_find(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1392 1393 /* Entry exists, so forward if necessary */ 1394 if (rt != NULL) { 1395 error = ip_mdq(m, ifp, rt, -1); 1396 MFC_UNLOCK(); 1397 VIF_UNLOCK(); 1398 return error; 1399 } else { 1400 /* 1401 * If we don't have a route for packet's origin, 1402 * Make a copy of the packet & send message to routing daemon 1403 */ 1404 1405 struct mbuf *mb0; 1406 struct rtdetq *rte; 1407 u_long hash; 1408 int hlen = ip->ip_hl << 2; 1409 1410 ++mrtstat.mrts_mfc_misses; 1411 1412 mrtstat.mrts_no_route++; 1413 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1414 log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n", 1415 (u_long)ntohl(ip->ip_src.s_addr), 1416 (u_long)ntohl(ip->ip_dst.s_addr)); 1417 1418 /* 1419 * Allocate mbufs early so that we don't do extra work if we are 1420 * just going to fail anyway. Make sure to pullup the header so 1421 * that other people can't step on it. 1422 */ 1423 rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, M_NOWAIT); 1424 if (rte == NULL) { 1425 MFC_UNLOCK(); 1426 VIF_UNLOCK(); 1427 return ENOBUFS; 1428 } 1429 mb0 = m_copypacket(m, M_DONTWAIT); 1430 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen)) 1431 mb0 = m_pullup(mb0, hlen); 1432 if (mb0 == NULL) { 1433 free(rte, M_MRTABLE); 1434 MFC_UNLOCK(); 1435 VIF_UNLOCK(); 1436 return ENOBUFS; 1437 } 1438 1439 /* is there an upcall waiting for this flow ? */ 1440 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1441 for (rt = mfctable[hash]; rt; rt = rt->mfc_next) { 1442 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) && 1443 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) && 1444 (rt->mfc_stall != NULL)) 1445 break; 1446 } 1447 1448 if (rt == NULL) { 1449 int i; 1450 struct igmpmsg *im; 1451 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1452 struct mbuf *mm; 1453 1454 /* 1455 * Locate the vifi for the incoming interface for this packet. 1456 * If none found, drop packet. 1457 */ 1458 for (vifi=0; vifi < numvifs && viftable[vifi].v_ifp != ifp; vifi++) 1459 ; 1460 if (vifi >= numvifs) /* vif not found, drop packet */ 1461 goto non_fatal; 1462 1463 /* no upcall, so make a new entry */ 1464 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1465 if (rt == NULL) 1466 goto fail; 1467 /* Make a copy of the header to send to the user level process */ 1468 mm = m_copy(mb0, 0, hlen); 1469 if (mm == NULL) 1470 goto fail1; 1471 1472 /* 1473 * Send message to routing daemon to install 1474 * a route into the kernel table 1475 */ 1476 1477 im = mtod(mm, struct igmpmsg *); 1478 im->im_msgtype = IGMPMSG_NOCACHE; 1479 im->im_mbz = 0; 1480 im->im_vif = vifi; 1481 1482 mrtstat.mrts_upcalls++; 1483 1484 k_igmpsrc.sin_addr = ip->ip_src; 1485 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1486 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n"); 1487 ++mrtstat.mrts_upq_sockfull; 1488fail1: 1489 free(rt, M_MRTABLE); 1490fail: 1491 free(rte, M_MRTABLE); 1492 m_freem(mb0); 1493 MFC_UNLOCK(); 1494 VIF_UNLOCK(); 1495 return ENOBUFS; 1496 } 1497 1498 /* insert new entry at head of hash chain */ 1499 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1500 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1501 rt->mfc_expire = UPCALL_EXPIRE; 1502 nexpire[hash]++; 1503 for (i = 0; i < numvifs; i++) { 1504 rt->mfc_ttls[i] = 0; 1505 rt->mfc_flags[i] = 0; 1506 } 1507 rt->mfc_parent = -1; 1508 1509 rt->mfc_rp.s_addr = INADDR_ANY; /* clear the RP address */ 1510 1511 rt->mfc_bw_meter = NULL; 1512 1513 /* link into table */ 1514 rt->mfc_next = mfctable[hash]; 1515 mfctable[hash] = rt; 1516 rt->mfc_stall = rte; 1517 1518 } else { 1519 /* determine if q has overflowed */ 1520 int npkts = 0; 1521 struct rtdetq **p; 1522 1523 /* 1524 * XXX ouch! we need to append to the list, but we 1525 * only have a pointer to the front, so we have to 1526 * scan the entire list every time. 1527 */ 1528 for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next) 1529 npkts++; 1530 1531 if (npkts > MAX_UPQ) { 1532 mrtstat.mrts_upq_ovflw++; 1533non_fatal: 1534 free(rte, M_MRTABLE); 1535 m_freem(mb0); 1536 MFC_UNLOCK(); 1537 VIF_UNLOCK(); 1538 return 0; 1539 } 1540 1541 /* Add this entry to the end of the queue */ 1542 *p = rte; 1543 } 1544 1545 rte->m = mb0; 1546 rte->ifp = ifp; 1547 rte->next = NULL; 1548 1549 MFC_UNLOCK(); 1550 VIF_UNLOCK(); 1551 1552 return 0; 1553 } 1554} 1555 1556/* 1557 * Clean up the cache entry if upcall is not serviced 1558 */ 1559static void 1560expire_upcalls(void *unused) 1561{ 1562 struct rtdetq *rte; 1563 struct mfc *mfc, **nptr; 1564 int i; 1565 1566 MFC_LOCK(); 1567 for (i = 0; i < MFCTBLSIZ; i++) { 1568 if (nexpire[i] == 0) 1569 continue; 1570 nptr = &mfctable[i]; 1571 for (mfc = *nptr; mfc != NULL; mfc = *nptr) { 1572 /* 1573 * Skip real cache entries 1574 * Make sure it wasn't marked to not expire (shouldn't happen) 1575 * If it expires now 1576 */ 1577 if (mfc->mfc_stall != NULL && mfc->mfc_expire != 0 && 1578 --mfc->mfc_expire == 0) { 1579 if (mrtdebug & DEBUG_EXPIRE) 1580 log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n", 1581 (u_long)ntohl(mfc->mfc_origin.s_addr), 1582 (u_long)ntohl(mfc->mfc_mcastgrp.s_addr)); 1583 /* 1584 * drop all the packets 1585 * free the mbuf with the pkt, if, timing info 1586 */ 1587 for (rte = mfc->mfc_stall; rte; ) { 1588 struct rtdetq *n = rte->next; 1589 1590 m_freem(rte->m); 1591 free(rte, M_MRTABLE); 1592 rte = n; 1593 } 1594 ++mrtstat.mrts_cache_cleanups; 1595 nexpire[i]--; 1596 1597 /* 1598 * free the bw_meter entries 1599 */ 1600 while (mfc->mfc_bw_meter != NULL) { 1601 struct bw_meter *x = mfc->mfc_bw_meter; 1602 1603 mfc->mfc_bw_meter = x->bm_mfc_next; 1604 free(x, M_BWMETER); 1605 } 1606 1607 *nptr = mfc->mfc_next; 1608 free(mfc, M_MRTABLE); 1609 } else { 1610 nptr = &mfc->mfc_next; 1611 } 1612 } 1613 } 1614 MFC_UNLOCK(); 1615 1616 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, NULL); 1617} 1618 1619/* 1620 * Packet forwarding routine once entry in the cache is made 1621 */ 1622static int 1623ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif) 1624{ 1625 struct ip *ip = mtod(m, struct ip *); 1626 vifi_t vifi; 1627 int plen = ip->ip_len; 1628 1629 VIF_LOCK_ASSERT(); 1630/* 1631 * Macro to send packet on vif. Since RSVP packets don't get counted on 1632 * input, they shouldn't get counted on output, so statistics keeping is 1633 * separate. 1634 */ 1635#define MC_SEND(ip,vifp,m) { \ 1636 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1637 encap_send((ip), (vifp), (m)); \ 1638 else \ 1639 phyint_send((ip), (vifp), (m)); \ 1640} 1641 1642 /* 1643 * If xmt_vif is not -1, send on only the requested vif. 1644 * 1645 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1646 */ 1647 if (xmt_vif < numvifs) { 1648#ifdef PIM 1649 if (viftable[xmt_vif].v_flags & VIFF_REGISTER) 1650 pim_register_send(ip, viftable + xmt_vif, m, rt); 1651 else 1652#endif 1653 MC_SEND(ip, viftable + xmt_vif, m); 1654 return 1; 1655 } 1656 1657 /* 1658 * Don't forward if it didn't arrive from the parent vif for its origin. 1659 */ 1660 vifi = rt->mfc_parent; 1661 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1662 /* came in the wrong interface */ 1663 if (mrtdebug & DEBUG_FORWARD) 1664 log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n", 1665 (void *)ifp, vifi, (void *)viftable[vifi].v_ifp); 1666 ++mrtstat.mrts_wrong_if; 1667 ++rt->mfc_wrong_if; 1668 /* 1669 * If we are doing PIM assert processing, send a message 1670 * to the routing daemon. 1671 * 1672 * XXX: A PIM-SM router needs the WRONGVIF detection so it 1673 * can complete the SPT switch, regardless of the type 1674 * of the iif (broadcast media, GRE tunnel, etc). 1675 */ 1676 if (pim_assert && (vifi < numvifs) && viftable[vifi].v_ifp) { 1677 struct timeval now; 1678 u_long delta; 1679 1680#ifdef PIM 1681 if (ifp == &multicast_register_if) 1682 pimstat.pims_rcv_registers_wrongiif++; 1683#endif 1684 1685 /* Get vifi for the incoming packet */ 1686 for (vifi=0; vifi < numvifs && viftable[vifi].v_ifp != ifp; vifi++) 1687 ; 1688 if (vifi >= numvifs) 1689 return 0; /* The iif is not found: ignore the packet. */ 1690 1691 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF) 1692 return 0; /* WRONGVIF disabled: ignore the packet */ 1693 1694 GET_TIME(now); 1695 1696 TV_DELTA(rt->mfc_last_assert, now, delta); 1697 1698 if (delta > ASSERT_MSG_TIME) { 1699 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1700 struct igmpmsg *im; 1701 int hlen = ip->ip_hl << 2; 1702 struct mbuf *mm = m_copy(m, 0, hlen); 1703 1704 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1705 mm = m_pullup(mm, hlen); 1706 if (mm == NULL) 1707 return ENOBUFS; 1708 1709 rt->mfc_last_assert = now; 1710 1711 im = mtod(mm, struct igmpmsg *); 1712 im->im_msgtype = IGMPMSG_WRONGVIF; 1713 im->im_mbz = 0; 1714 im->im_vif = vifi; 1715 1716 mrtstat.mrts_upcalls++; 1717 1718 k_igmpsrc.sin_addr = im->im_src; 1719 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1720 log(LOG_WARNING, 1721 "ip_mforward: ip_mrouter socket queue full\n"); 1722 ++mrtstat.mrts_upq_sockfull; 1723 return ENOBUFS; 1724 } 1725 } 1726 } 1727 return 0; 1728 } 1729 1730 /* If I sourced this packet, it counts as output, else it was input. */ 1731 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) { 1732 viftable[vifi].v_pkt_out++; 1733 viftable[vifi].v_bytes_out += plen; 1734 } else { 1735 viftable[vifi].v_pkt_in++; 1736 viftable[vifi].v_bytes_in += plen; 1737 } 1738 rt->mfc_pkt_cnt++; 1739 rt->mfc_byte_cnt += plen; 1740 1741 /* 1742 * For each vif, decide if a copy of the packet should be forwarded. 1743 * Forward if: 1744 * - the ttl exceeds the vif's threshold 1745 * - there are group members downstream on interface 1746 */ 1747 for (vifi = 0; vifi < numvifs; vifi++) 1748 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1749 viftable[vifi].v_pkt_out++; 1750 viftable[vifi].v_bytes_out += plen; 1751#ifdef PIM 1752 if (viftable[vifi].v_flags & VIFF_REGISTER) 1753 pim_register_send(ip, viftable + vifi, m, rt); 1754 else 1755#endif 1756 MC_SEND(ip, viftable+vifi, m); 1757 } 1758 1759 /* 1760 * Perform upcall-related bw measuring. 1761 */ 1762 if (rt->mfc_bw_meter != NULL) { 1763 struct bw_meter *x; 1764 struct timeval now; 1765 1766 GET_TIME(now); 1767 MFC_LOCK_ASSERT(); 1768 for (x = rt->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) 1769 bw_meter_receive_packet(x, plen, &now); 1770 } 1771 1772 return 0; 1773} 1774 1775/* 1776 * check if a vif number is legal/ok. This is used by ip_output. 1777 */ 1778static int 1779X_legal_vif_num(int vif) 1780{ 1781 /* XXX unlocked, matter? */ 1782 return (vif >= 0 && vif < numvifs); 1783} 1784 1785/* 1786 * Return the local address used by this vif 1787 */ 1788static u_long 1789X_ip_mcast_src(int vifi) 1790{ 1791 /* XXX unlocked, matter? */ 1792 if (vifi >= 0 && vifi < numvifs) 1793 return viftable[vifi].v_lcl_addr.s_addr; 1794 else 1795 return INADDR_ANY; 1796} 1797 1798static void 1799phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1800{ 1801 struct mbuf *mb_copy; 1802 int hlen = ip->ip_hl << 2; 1803 1804 VIF_LOCK_ASSERT(); 1805 1806 /* 1807 * Make a new reference to the packet; make sure that 1808 * the IP header is actually copied, not just referenced, 1809 * so that ip_output() only scribbles on the copy. 1810 */ 1811 mb_copy = m_copypacket(m, M_DONTWAIT); 1812 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1813 mb_copy = m_pullup(mb_copy, hlen); 1814 if (mb_copy == NULL) 1815 return; 1816 1817 if (vifp->v_rate_limit == 0) 1818 tbf_send_packet(vifp, mb_copy); 1819 else 1820 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len); 1821} 1822 1823static void 1824encap_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1825{ 1826 struct mbuf *mb_copy; 1827 struct ip *ip_copy; 1828 int i, len = ip->ip_len; 1829 1830 VIF_LOCK_ASSERT(); 1831 1832 /* Take care of delayed checksums */ 1833 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1834 in_delayed_cksum(m); 1835 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1836 } 1837 1838 /* 1839 * copy the old packet & pullup its IP header into the 1840 * new mbuf so we can modify it. Try to fill the new 1841 * mbuf since if we don't the ethernet driver will. 1842 */ 1843 MGETHDR(mb_copy, M_DONTWAIT, MT_HEADER); 1844 if (mb_copy == NULL) 1845 return; 1846#ifdef MAC 1847 mac_create_mbuf_multicast_encap(m, vifp->v_ifp, mb_copy); 1848#endif 1849 mb_copy->m_data += max_linkhdr; 1850 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1851 1852 if ((mb_copy->m_next = m_copypacket(m, M_DONTWAIT)) == NULL) { 1853 m_freem(mb_copy); 1854 return; 1855 } 1856 i = MHLEN - M_LEADINGSPACE(mb_copy); 1857 if (i > len) 1858 i = len; 1859 mb_copy = m_pullup(mb_copy, i); 1860 if (mb_copy == NULL) 1861 return; 1862 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr); 1863 1864 /* 1865 * fill in the encapsulating IP header. 1866 */ 1867 ip_copy = mtod(mb_copy, struct ip *); 1868 *ip_copy = multicast_encap_iphdr; 1869#ifdef RANDOM_IP_ID 1870 ip_copy->ip_id = ip_randomid(); 1871#else 1872 ip_copy->ip_id = htons(ip_id++); 1873#endif 1874 ip_copy->ip_len += len; 1875 ip_copy->ip_src = vifp->v_lcl_addr; 1876 ip_copy->ip_dst = vifp->v_rmt_addr; 1877 1878 /* 1879 * turn the encapsulated IP header back into a valid one. 1880 */ 1881 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1882 --ip->ip_ttl; 1883 ip->ip_len = htons(ip->ip_len); 1884 ip->ip_off = htons(ip->ip_off); 1885 ip->ip_sum = 0; 1886 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1887 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1888 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1889 1890 if (vifp->v_rate_limit == 0) 1891 tbf_send_packet(vifp, mb_copy); 1892 else 1893 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len); 1894} 1895 1896/* 1897 * Token bucket filter module 1898 */ 1899 1900static void 1901tbf_control(struct vif *vifp, struct mbuf *m, struct ip *ip, u_long p_len) 1902{ 1903 struct tbf *t = vifp->v_tbf; 1904 1905 VIF_LOCK_ASSERT(); 1906 1907 if (p_len > MAX_BKT_SIZE) { /* drop if packet is too large */ 1908 mrtstat.mrts_pkt2large++; 1909 m_freem(m); 1910 return; 1911 } 1912 1913 tbf_update_tokens(vifp); 1914 1915 if (t->tbf_q_len == 0) { /* queue empty... */ 1916 if (p_len <= t->tbf_n_tok) { /* send packet if enough tokens */ 1917 t->tbf_n_tok -= p_len; 1918 tbf_send_packet(vifp, m); 1919 } else { /* no, queue packet and try later */ 1920 tbf_queue(vifp, m); 1921 callout_reset(&tbf_reprocess_ch, TBF_REPROCESS, 1922 tbf_reprocess_q, vifp); 1923 } 1924 } else if (t->tbf_q_len < t->tbf_max_q_len) { 1925 /* finite queue length, so queue pkts and process queue */ 1926 tbf_queue(vifp, m); 1927 tbf_process_q(vifp); 1928 } else { 1929 /* queue full, try to dq and queue and process */ 1930 if (!tbf_dq_sel(vifp, ip)) { 1931 mrtstat.mrts_q_overflow++; 1932 m_freem(m); 1933 } else { 1934 tbf_queue(vifp, m); 1935 tbf_process_q(vifp); 1936 } 1937 } 1938} 1939 1940/* 1941 * adds a packet to the queue at the interface 1942 */ 1943static void 1944tbf_queue(struct vif *vifp, struct mbuf *m) 1945{ 1946 struct tbf *t = vifp->v_tbf; 1947 1948 VIF_LOCK_ASSERT(); 1949 1950 if (t->tbf_t == NULL) /* Queue was empty */ 1951 t->tbf_q = m; 1952 else /* Insert at tail */ 1953 t->tbf_t->m_act = m; 1954 1955 t->tbf_t = m; /* Set new tail pointer */ 1956 1957#ifdef DIAGNOSTIC 1958 /* Make sure we didn't get fed a bogus mbuf */ 1959 if (m->m_act) 1960 panic("tbf_queue: m_act"); 1961#endif 1962 m->m_act = NULL; 1963 1964 t->tbf_q_len++; 1965} 1966 1967/* 1968 * processes the queue at the interface 1969 */ 1970static void 1971tbf_process_q(struct vif *vifp) 1972{ 1973 struct tbf *t = vifp->v_tbf; 1974 1975 VIF_LOCK_ASSERT(); 1976 1977 /* loop through the queue at the interface and send as many packets 1978 * as possible 1979 */ 1980 while (t->tbf_q_len > 0) { 1981 struct mbuf *m = t->tbf_q; 1982 int len = mtod(m, struct ip *)->ip_len; 1983 1984 /* determine if the packet can be sent */ 1985 if (len > t->tbf_n_tok) /* not enough tokens, we are done */ 1986 break; 1987 /* ok, reduce no of tokens, dequeue and send the packet. */ 1988 t->tbf_n_tok -= len; 1989 1990 t->tbf_q = m->m_act; 1991 if (--t->tbf_q_len == 0) 1992 t->tbf_t = NULL; 1993 1994 m->m_act = NULL; 1995 tbf_send_packet(vifp, m); 1996 } 1997} 1998 1999static void 2000tbf_reprocess_q(void *xvifp) 2001{ 2002 struct vif *vifp = xvifp; 2003 2004 if (ip_mrouter == NULL) 2005 return; 2006 VIF_LOCK(); 2007 tbf_update_tokens(vifp); 2008 tbf_process_q(vifp); 2009 if (vifp->v_tbf->tbf_q_len) 2010 callout_reset(&tbf_reprocess_ch, TBF_REPROCESS, tbf_reprocess_q, vifp); 2011 VIF_UNLOCK(); 2012} 2013 2014/* function that will selectively discard a member of the queue 2015 * based on the precedence value and the priority 2016 */ 2017static int 2018tbf_dq_sel(struct vif *vifp, struct ip *ip) 2019{ 2020 u_int p; 2021 struct mbuf *m, *last; 2022 struct mbuf **np; 2023 struct tbf *t = vifp->v_tbf; 2024 2025 VIF_LOCK_ASSERT(); 2026 2027 p = priority(vifp, ip); 2028 2029 np = &t->tbf_q; 2030 last = NULL; 2031 while ((m = *np) != NULL) { 2032 if (p > priority(vifp, mtod(m, struct ip *))) { 2033 *np = m->m_act; 2034 /* If we're removing the last packet, fix the tail pointer */ 2035 if (m == t->tbf_t) 2036 t->tbf_t = last; 2037 m_freem(m); 2038 /* It's impossible for the queue to be empty, but check anyways. */ 2039 if (--t->tbf_q_len == 0) 2040 t->tbf_t = NULL; 2041 mrtstat.mrts_drop_sel++; 2042 return 1; 2043 } 2044 np = &m->m_act; 2045 last = m; 2046 } 2047 return 0; 2048} 2049 2050static void 2051tbf_send_packet(struct vif *vifp, struct mbuf *m) 2052{ 2053 VIF_LOCK_ASSERT(); 2054 2055 if (vifp->v_flags & VIFF_TUNNEL) /* If tunnel options */ 2056 ip_output(m, NULL, &vifp->v_route, IP_FORWARDING, NULL, NULL); 2057 else { 2058 struct ip_moptions imo; 2059 int error; 2060 static struct route ro; /* XXX check this */ 2061 2062 imo.imo_multicast_ifp = vifp->v_ifp; 2063 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 2064 imo.imo_multicast_loop = 1; 2065 imo.imo_multicast_vif = -1; 2066 2067 /* 2068 * Re-entrancy should not be a problem here, because 2069 * the packets that we send out and are looped back at us 2070 * should get rejected because they appear to come from 2071 * the loopback interface, thus preventing looping. 2072 */ 2073 error = ip_output(m, NULL, &ro, IP_FORWARDING, &imo, NULL); 2074 2075 if (mrtdebug & DEBUG_XMIT) 2076 log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 2077 (int)(vifp - viftable), error); 2078 } 2079} 2080 2081/* determine the current time and then 2082 * the elapsed time (between the last time and time now) 2083 * in milliseconds & update the no. of tokens in the bucket 2084 */ 2085static void 2086tbf_update_tokens(struct vif *vifp) 2087{ 2088 struct timeval tp; 2089 u_long tm; 2090 struct tbf *t = vifp->v_tbf; 2091 2092 VIF_LOCK_ASSERT(); 2093 2094 GET_TIME(tp); 2095 2096 TV_DELTA(tp, t->tbf_last_pkt_t, tm); 2097 2098 /* 2099 * This formula is actually 2100 * "time in seconds" * "bytes/second". 2101 * 2102 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 2103 * 2104 * The (1000/1024) was introduced in add_vif to optimize 2105 * this divide into a shift. 2106 */ 2107 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8; 2108 t->tbf_last_pkt_t = tp; 2109 2110 if (t->tbf_n_tok > MAX_BKT_SIZE) 2111 t->tbf_n_tok = MAX_BKT_SIZE; 2112} 2113 2114static int 2115priority(struct vif *vifp, struct ip *ip) 2116{ 2117 int prio = 50; /* the lowest priority -- default case */ 2118 2119 /* temporary hack; may add general packet classifier some day */ 2120 2121 /* 2122 * The UDP port space is divided up into four priority ranges: 2123 * [0, 16384) : unclassified - lowest priority 2124 * [16384, 32768) : audio - highest priority 2125 * [32768, 49152) : whiteboard - medium priority 2126 * [49152, 65536) : video - low priority 2127 * 2128 * Everything else gets lowest priority. 2129 */ 2130 if (ip->ip_p == IPPROTO_UDP) { 2131 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 2132 switch (ntohs(udp->uh_dport) & 0xc000) { 2133 case 0x4000: 2134 prio = 70; 2135 break; 2136 case 0x8000: 2137 prio = 60; 2138 break; 2139 case 0xc000: 2140 prio = 55; 2141 break; 2142 } 2143 } 2144 return prio; 2145} 2146 2147/* 2148 * End of token bucket filter modifications 2149 */ 2150 2151static int 2152X_ip_rsvp_vif(struct socket *so, struct sockopt *sopt) 2153{ 2154 int error, vifi; 2155 2156 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2157 return EOPNOTSUPP; 2158 2159 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi); 2160 if (error) 2161 return error; 2162 2163 VIF_LOCK(); 2164 2165 if (vifi < 0 || vifi >= numvifs) { /* Error if vif is invalid */ 2166 VIF_UNLOCK(); 2167 return EADDRNOTAVAIL; 2168 } 2169 2170 if (sopt->sopt_name == IP_RSVP_VIF_ON) { 2171 /* Check if socket is available. */ 2172 if (viftable[vifi].v_rsvpd != NULL) { 2173 VIF_UNLOCK(); 2174 return EADDRINUSE; 2175 } 2176 2177 viftable[vifi].v_rsvpd = so; 2178 /* This may seem silly, but we need to be sure we don't over-increment 2179 * the RSVP counter, in case something slips up. 2180 */ 2181 if (!viftable[vifi].v_rsvp_on) { 2182 viftable[vifi].v_rsvp_on = 1; 2183 rsvp_on++; 2184 } 2185 } else { /* must be VIF_OFF */ 2186 /* 2187 * XXX as an additional consistency check, one could make sure 2188 * that viftable[vifi].v_rsvpd == so, otherwise passing so as 2189 * first parameter is pretty useless. 2190 */ 2191 viftable[vifi].v_rsvpd = NULL; 2192 /* 2193 * This may seem silly, but we need to be sure we don't over-decrement 2194 * the RSVP counter, in case something slips up. 2195 */ 2196 if (viftable[vifi].v_rsvp_on) { 2197 viftable[vifi].v_rsvp_on = 0; 2198 rsvp_on--; 2199 } 2200 } 2201 VIF_UNLOCK(); 2202 return 0; 2203} 2204 2205static void 2206X_ip_rsvp_force_done(struct socket *so) 2207{ 2208 int vifi; 2209 2210 /* Don't bother if it is not the right type of socket. */ 2211 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2212 return; 2213 2214 VIF_LOCK(); 2215 2216 /* The socket may be attached to more than one vif...this 2217 * is perfectly legal. 2218 */ 2219 for (vifi = 0; vifi < numvifs; vifi++) { 2220 if (viftable[vifi].v_rsvpd == so) { 2221 viftable[vifi].v_rsvpd = NULL; 2222 /* This may seem silly, but we need to be sure we don't 2223 * over-decrement the RSVP counter, in case something slips up. 2224 */ 2225 if (viftable[vifi].v_rsvp_on) { 2226 viftable[vifi].v_rsvp_on = 0; 2227 rsvp_on--; 2228 } 2229 } 2230 } 2231 2232 VIF_UNLOCK(); 2233} 2234 2235static void 2236X_rsvp_input(struct mbuf *m, int off) 2237{ 2238 int vifi; 2239 struct ip *ip = mtod(m, struct ip *); 2240 struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET }; 2241 struct ifnet *ifp; 2242 2243 if (rsvpdebug) 2244 printf("rsvp_input: rsvp_on %d\n",rsvp_on); 2245 2246 /* Can still get packets with rsvp_on = 0 if there is a local member 2247 * of the group to which the RSVP packet is addressed. But in this 2248 * case we want to throw the packet away. 2249 */ 2250 if (!rsvp_on) { 2251 m_freem(m); 2252 return; 2253 } 2254 2255 if (rsvpdebug) 2256 printf("rsvp_input: check vifs\n"); 2257 2258#ifdef DIAGNOSTIC 2259 M_ASSERTPKTHDR(m); 2260#endif 2261 2262 ifp = m->m_pkthdr.rcvif; 2263 2264 VIF_LOCK(); 2265 /* Find which vif the packet arrived on. */ 2266 for (vifi = 0; vifi < numvifs; vifi++) 2267 if (viftable[vifi].v_ifp == ifp) 2268 break; 2269 2270 if (vifi == numvifs || viftable[vifi].v_rsvpd == NULL) { 2271 /* 2272 * Drop the lock here to avoid holding it across rip_input. 2273 * This could make rsvpdebug printfs wrong. If you care, 2274 * record the state of stuff before dropping the lock. 2275 */ 2276 VIF_UNLOCK(); 2277 /* 2278 * If the old-style non-vif-associated socket is set, 2279 * then use it. Otherwise, drop packet since there 2280 * is no specific socket for this vif. 2281 */ 2282 if (ip_rsvpd != NULL) { 2283 if (rsvpdebug) 2284 printf("rsvp_input: Sending packet up old-style socket\n"); 2285 rip_input(m, off); /* xxx */ 2286 } else { 2287 if (rsvpdebug && vifi == numvifs) 2288 printf("rsvp_input: Can't find vif for packet.\n"); 2289 else if (rsvpdebug && viftable[vifi].v_rsvpd == NULL) 2290 printf("rsvp_input: No socket defined for vif %d\n",vifi); 2291 m_freem(m); 2292 } 2293 return; 2294 } 2295 rsvp_src.sin_addr = ip->ip_src; 2296 2297 if (rsvpdebug && m) 2298 printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n", 2299 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv))); 2300 2301 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) { 2302 if (rsvpdebug) 2303 printf("rsvp_input: Failed to append to socket\n"); 2304 } else { 2305 if (rsvpdebug) 2306 printf("rsvp_input: send packet up\n"); 2307 } 2308 VIF_UNLOCK(); 2309} 2310 2311/* 2312 * Code for bandwidth monitors 2313 */ 2314 2315/* 2316 * Define common interface for timeval-related methods 2317 */ 2318#define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp) 2319#define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp)) 2320#define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp)) 2321 2322static uint32_t 2323compute_bw_meter_flags(struct bw_upcall *req) 2324{ 2325 uint32_t flags = 0; 2326 2327 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS) 2328 flags |= BW_METER_UNIT_PACKETS; 2329 if (req->bu_flags & BW_UPCALL_UNIT_BYTES) 2330 flags |= BW_METER_UNIT_BYTES; 2331 if (req->bu_flags & BW_UPCALL_GEQ) 2332 flags |= BW_METER_GEQ; 2333 if (req->bu_flags & BW_UPCALL_LEQ) 2334 flags |= BW_METER_LEQ; 2335 2336 return flags; 2337} 2338 2339/* 2340 * Add a bw_meter entry 2341 */ 2342static int 2343add_bw_upcall(struct bw_upcall *req) 2344{ 2345 struct mfc *mfc; 2346 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC, 2347 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC }; 2348 struct timeval now; 2349 struct bw_meter *x; 2350 uint32_t flags; 2351 2352 if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) 2353 return EOPNOTSUPP; 2354 2355 /* Test if the flags are valid */ 2356 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES))) 2357 return EINVAL; 2358 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))) 2359 return EINVAL; 2360 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 2361 == (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 2362 return EINVAL; 2363 2364 /* Test if the threshold time interval is valid */ 2365 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <)) 2366 return EINVAL; 2367 2368 flags = compute_bw_meter_flags(req); 2369 2370 /* 2371 * Find if we have already same bw_meter entry 2372 */ 2373 MFC_LOCK(); 2374 mfc = mfc_find(req->bu_src.s_addr, req->bu_dst.s_addr); 2375 if (mfc == NULL) { 2376 MFC_UNLOCK(); 2377 return EADDRNOTAVAIL; 2378 } 2379 for (x = mfc->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) { 2380 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 2381 &req->bu_threshold.b_time, ==)) && 2382 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 2383 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 2384 (x->bm_flags & BW_METER_USER_FLAGS) == flags) { 2385 MFC_UNLOCK(); 2386 return 0; /* XXX Already installed */ 2387 } 2388 } 2389 2390 /* Allocate the new bw_meter entry */ 2391 x = (struct bw_meter *)malloc(sizeof(*x), M_BWMETER, M_NOWAIT); 2392 if (x == NULL) { 2393 MFC_UNLOCK(); 2394 return ENOBUFS; 2395 } 2396 2397 /* Set the new bw_meter entry */ 2398 x->bm_threshold.b_time = req->bu_threshold.b_time; 2399 GET_TIME(now); 2400 x->bm_start_time = now; 2401 x->bm_threshold.b_packets = req->bu_threshold.b_packets; 2402 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes; 2403 x->bm_measured.b_packets = 0; 2404 x->bm_measured.b_bytes = 0; 2405 x->bm_flags = flags; 2406 x->bm_time_next = NULL; 2407 x->bm_time_hash = BW_METER_BUCKETS; 2408 2409 /* Add the new bw_meter entry to the front of entries for this MFC */ 2410 x->bm_mfc = mfc; 2411 x->bm_mfc_next = mfc->mfc_bw_meter; 2412 mfc->mfc_bw_meter = x; 2413 schedule_bw_meter(x, &now); 2414 MFC_UNLOCK(); 2415 2416 return 0; 2417} 2418 2419static void 2420free_bw_list(struct bw_meter *list) 2421{ 2422 while (list != NULL) { 2423 struct bw_meter *x = list; 2424 2425 list = list->bm_mfc_next; 2426 unschedule_bw_meter(x); 2427 free(x, M_BWMETER); 2428 } 2429} 2430 2431/* 2432 * Delete one or multiple bw_meter entries 2433 */ 2434static int 2435del_bw_upcall(struct bw_upcall *req) 2436{ 2437 struct mfc *mfc; 2438 struct bw_meter *x; 2439 2440 if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) 2441 return EOPNOTSUPP; 2442 2443 MFC_LOCK(); 2444 /* Find the corresponding MFC entry */ 2445 mfc = mfc_find(req->bu_src.s_addr, req->bu_dst.s_addr); 2446 if (mfc == NULL) { 2447 MFC_UNLOCK(); 2448 return EADDRNOTAVAIL; 2449 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) { 2450 /* 2451 * Delete all bw_meter entries for this mfc 2452 */ 2453 struct bw_meter *list; 2454 2455 list = mfc->mfc_bw_meter; 2456 mfc->mfc_bw_meter = NULL; 2457 free_bw_list(list); 2458 MFC_UNLOCK(); 2459 return 0; 2460 } else { /* Delete a single bw_meter entry */ 2461 struct bw_meter *prev; 2462 uint32_t flags = 0; 2463 2464 flags = compute_bw_meter_flags(req); 2465 2466 /* Find the bw_meter entry to delete */ 2467 for (prev = NULL, x = mfc->mfc_bw_meter; x != NULL; 2468 x = x->bm_mfc_next) { 2469 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 2470 &req->bu_threshold.b_time, ==)) && 2471 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 2472 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 2473 (x->bm_flags & BW_METER_USER_FLAGS) == flags) 2474 break; 2475 } 2476 if (x != NULL) { /* Delete entry from the list for this MFC */ 2477 if (prev != NULL) 2478 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/ 2479 else 2480 x->bm_mfc->mfc_bw_meter = x->bm_mfc_next;/* new head of list */ 2481 2482 unschedule_bw_meter(x); 2483 MFC_UNLOCK(); 2484 /* Free the bw_meter entry */ 2485 free(x, M_BWMETER); 2486 return 0; 2487 } else { 2488 MFC_UNLOCK(); 2489 return EINVAL; 2490 } 2491 } 2492 /* NOTREACHED */ 2493} 2494 2495/* 2496 * Perform bandwidth measurement processing that may result in an upcall 2497 */ 2498static void 2499bw_meter_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp) 2500{ 2501 struct timeval delta; 2502 2503 MFC_LOCK_ASSERT(); 2504 2505 delta = *nowp; 2506 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2507 2508 if (x->bm_flags & BW_METER_GEQ) { 2509 /* 2510 * Processing for ">=" type of bw_meter entry 2511 */ 2512 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 2513 /* Reset the bw_meter entry */ 2514 x->bm_start_time = *nowp; 2515 x->bm_measured.b_packets = 0; 2516 x->bm_measured.b_bytes = 0; 2517 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2518 } 2519 2520 /* Record that a packet is received */ 2521 x->bm_measured.b_packets++; 2522 x->bm_measured.b_bytes += plen; 2523 2524 /* 2525 * Test if we should deliver an upcall 2526 */ 2527 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) { 2528 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2529 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) || 2530 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2531 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) { 2532 /* Prepare an upcall for delivery */ 2533 bw_meter_prepare_upcall(x, nowp); 2534 x->bm_flags |= BW_METER_UPCALL_DELIVERED; 2535 } 2536 } 2537 } else if (x->bm_flags & BW_METER_LEQ) { 2538 /* 2539 * Processing for "<=" type of bw_meter entry 2540 */ 2541 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 2542 /* 2543 * We are behind time with the multicast forwarding table 2544 * scanning for "<=" type of bw_meter entries, so test now 2545 * if we should deliver an upcall. 2546 */ 2547 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2548 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2549 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2550 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2551 /* Prepare an upcall for delivery */ 2552 bw_meter_prepare_upcall(x, nowp); 2553 } 2554 /* Reschedule the bw_meter entry */ 2555 unschedule_bw_meter(x); 2556 schedule_bw_meter(x, nowp); 2557 } 2558 2559 /* Record that a packet is received */ 2560 x->bm_measured.b_packets++; 2561 x->bm_measured.b_bytes += plen; 2562 2563 /* 2564 * Test if we should restart the measuring interval 2565 */ 2566 if ((x->bm_flags & BW_METER_UNIT_PACKETS && 2567 x->bm_measured.b_packets <= x->bm_threshold.b_packets) || 2568 (x->bm_flags & BW_METER_UNIT_BYTES && 2569 x->bm_measured.b_bytes <= x->bm_threshold.b_bytes)) { 2570 /* Don't restart the measuring interval */ 2571 } else { 2572 /* Do restart the measuring interval */ 2573 /* 2574 * XXX: note that we don't unschedule and schedule, because this 2575 * might be too much overhead per packet. Instead, when we process 2576 * all entries for a given timer hash bin, we check whether it is 2577 * really a timeout. If not, we reschedule at that time. 2578 */ 2579 x->bm_start_time = *nowp; 2580 x->bm_measured.b_packets = 0; 2581 x->bm_measured.b_bytes = 0; 2582 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2583 } 2584 } 2585} 2586 2587/* 2588 * Prepare a bandwidth-related upcall 2589 */ 2590static void 2591bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp) 2592{ 2593 struct timeval delta; 2594 struct bw_upcall *u; 2595 2596 MFC_LOCK_ASSERT(); 2597 2598 /* 2599 * Compute the measured time interval 2600 */ 2601 delta = *nowp; 2602 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2603 2604 /* 2605 * If there are too many pending upcalls, deliver them now 2606 */ 2607 if (bw_upcalls_n >= BW_UPCALLS_MAX) 2608 bw_upcalls_send(); 2609 2610 /* 2611 * Set the bw_upcall entry 2612 */ 2613 u = &bw_upcalls[bw_upcalls_n++]; 2614 u->bu_src = x->bm_mfc->mfc_origin; 2615 u->bu_dst = x->bm_mfc->mfc_mcastgrp; 2616 u->bu_threshold.b_time = x->bm_threshold.b_time; 2617 u->bu_threshold.b_packets = x->bm_threshold.b_packets; 2618 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes; 2619 u->bu_measured.b_time = delta; 2620 u->bu_measured.b_packets = x->bm_measured.b_packets; 2621 u->bu_measured.b_bytes = x->bm_measured.b_bytes; 2622 u->bu_flags = 0; 2623 if (x->bm_flags & BW_METER_UNIT_PACKETS) 2624 u->bu_flags |= BW_UPCALL_UNIT_PACKETS; 2625 if (x->bm_flags & BW_METER_UNIT_BYTES) 2626 u->bu_flags |= BW_UPCALL_UNIT_BYTES; 2627 if (x->bm_flags & BW_METER_GEQ) 2628 u->bu_flags |= BW_UPCALL_GEQ; 2629 if (x->bm_flags & BW_METER_LEQ) 2630 u->bu_flags |= BW_UPCALL_LEQ; 2631} 2632 2633/* 2634 * Send the pending bandwidth-related upcalls 2635 */ 2636static void 2637bw_upcalls_send(void) 2638{ 2639 struct mbuf *m; 2640 int len = bw_upcalls_n * sizeof(bw_upcalls[0]); 2641 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2642 static struct igmpmsg igmpmsg = { 0, /* unused1 */ 2643 0, /* unused2 */ 2644 IGMPMSG_BW_UPCALL,/* im_msgtype */ 2645 0, /* im_mbz */ 2646 0, /* im_vif */ 2647 0, /* unused3 */ 2648 { 0 }, /* im_src */ 2649 { 0 } }; /* im_dst */ 2650 2651 MFC_LOCK_ASSERT(); 2652 2653 if (bw_upcalls_n == 0) 2654 return; /* No pending upcalls */ 2655 2656 bw_upcalls_n = 0; 2657 2658 /* 2659 * Allocate a new mbuf, initialize it with the header and 2660 * the payload for the pending calls. 2661 */ 2662 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2663 if (m == NULL) { 2664 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n"); 2665 return; 2666 } 2667 2668 m->m_len = m->m_pkthdr.len = 0; 2669 m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg); 2670 m_copyback(m, sizeof(struct igmpmsg), len, (caddr_t)&bw_upcalls[0]); 2671 2672 /* 2673 * Send the upcalls 2674 * XXX do we need to set the address in k_igmpsrc ? 2675 */ 2676 mrtstat.mrts_upcalls++; 2677 if (socket_send(ip_mrouter, m, &k_igmpsrc) < 0) { 2678 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n"); 2679 ++mrtstat.mrts_upq_sockfull; 2680 } 2681} 2682 2683/* 2684 * Compute the timeout hash value for the bw_meter entries 2685 */ 2686#define BW_METER_TIMEHASH(bw_meter, hash) \ 2687 do { \ 2688 struct timeval next_timeval = (bw_meter)->bm_start_time; \ 2689 \ 2690 BW_TIMEVALADD(&next_timeval, &(bw_meter)->bm_threshold.b_time); \ 2691 (hash) = next_timeval.tv_sec; \ 2692 if (next_timeval.tv_usec) \ 2693 (hash)++; /* XXX: make sure we don't timeout early */ \ 2694 (hash) %= BW_METER_BUCKETS; \ 2695 } while (0) 2696 2697/* 2698 * Schedule a timer to process periodically bw_meter entry of type "<=" 2699 * by linking the entry in the proper hash bucket. 2700 */ 2701static void 2702schedule_bw_meter(struct bw_meter *x, struct timeval *nowp) 2703{ 2704 int time_hash; 2705 2706 MFC_LOCK_ASSERT(); 2707 2708 if (!(x->bm_flags & BW_METER_LEQ)) 2709 return; /* XXX: we schedule timers only for "<=" entries */ 2710 2711 /* 2712 * Reset the bw_meter entry 2713 */ 2714 x->bm_start_time = *nowp; 2715 x->bm_measured.b_packets = 0; 2716 x->bm_measured.b_bytes = 0; 2717 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2718 2719 /* 2720 * Compute the timeout hash value and insert the entry 2721 */ 2722 BW_METER_TIMEHASH(x, time_hash); 2723 x->bm_time_next = bw_meter_timers[time_hash]; 2724 bw_meter_timers[time_hash] = x; 2725 x->bm_time_hash = time_hash; 2726} 2727 2728/* 2729 * Unschedule the periodic timer that processes bw_meter entry of type "<=" 2730 * by removing the entry from the proper hash bucket. 2731 */ 2732static void 2733unschedule_bw_meter(struct bw_meter *x) 2734{ 2735 int time_hash; 2736 struct bw_meter *prev, *tmp; 2737 2738 MFC_LOCK_ASSERT(); 2739 2740 if (!(x->bm_flags & BW_METER_LEQ)) 2741 return; /* XXX: we schedule timers only for "<=" entries */ 2742 2743 /* 2744 * Compute the timeout hash value and delete the entry 2745 */ 2746 time_hash = x->bm_time_hash; 2747 if (time_hash >= BW_METER_BUCKETS) 2748 return; /* Entry was not scheduled */ 2749 2750 for (prev = NULL, tmp = bw_meter_timers[time_hash]; 2751 tmp != NULL; prev = tmp, tmp = tmp->bm_time_next) 2752 if (tmp == x) 2753 break; 2754 2755 if (tmp == NULL) 2756 panic("unschedule_bw_meter: bw_meter entry not found"); 2757 2758 if (prev != NULL) 2759 prev->bm_time_next = x->bm_time_next; 2760 else 2761 bw_meter_timers[time_hash] = x->bm_time_next; 2762 2763 x->bm_time_next = NULL; 2764 x->bm_time_hash = BW_METER_BUCKETS; 2765} 2766 2767 2768/* 2769 * Process all "<=" type of bw_meter that should be processed now, 2770 * and for each entry prepare an upcall if necessary. Each processed 2771 * entry is rescheduled again for the (periodic) processing. 2772 * 2773 * This is run periodically (once per second normally). On each round, 2774 * all the potentially matching entries are in the hash slot that we are 2775 * looking at. 2776 */ 2777static void 2778bw_meter_process() 2779{ 2780 static uint32_t last_tv_sec; /* last time we processed this */ 2781 2782 uint32_t loops; 2783 int i; 2784 struct timeval now, process_endtime; 2785 2786 GET_TIME(now); 2787 if (last_tv_sec == now.tv_sec) 2788 return; /* nothing to do */ 2789 2790 loops = now.tv_sec - last_tv_sec; 2791 last_tv_sec = now.tv_sec; 2792 if (loops > BW_METER_BUCKETS) 2793 loops = BW_METER_BUCKETS; 2794 2795 MFC_LOCK(); 2796 /* 2797 * Process all bins of bw_meter entries from the one after the last 2798 * processed to the current one. On entry, i points to the last bucket 2799 * visited, so we need to increment i at the beginning of the loop. 2800 */ 2801 for (i = (now.tv_sec - loops) % BW_METER_BUCKETS; loops > 0; loops--) { 2802 struct bw_meter *x, *tmp_list; 2803 2804 if (++i >= BW_METER_BUCKETS) 2805 i = 0; 2806 2807 /* Disconnect the list of bw_meter entries from the bin */ 2808 tmp_list = bw_meter_timers[i]; 2809 bw_meter_timers[i] = NULL; 2810 2811 /* Process the list of bw_meter entries */ 2812 while (tmp_list != NULL) { 2813 x = tmp_list; 2814 tmp_list = tmp_list->bm_time_next; 2815 2816 /* Test if the time interval is over */ 2817 process_endtime = x->bm_start_time; 2818 BW_TIMEVALADD(&process_endtime, &x->bm_threshold.b_time); 2819 if (BW_TIMEVALCMP(&process_endtime, &now, >)) { 2820 /* Not yet: reschedule, but don't reset */ 2821 int time_hash; 2822 2823 BW_METER_TIMEHASH(x, time_hash); 2824 if (time_hash == i && process_endtime.tv_sec == now.tv_sec) { 2825 /* 2826 * XXX: somehow the bin processing is a bit ahead of time. 2827 * Put the entry in the next bin. 2828 */ 2829 if (++time_hash >= BW_METER_BUCKETS) 2830 time_hash = 0; 2831 } 2832 x->bm_time_next = bw_meter_timers[time_hash]; 2833 bw_meter_timers[time_hash] = x; 2834 x->bm_time_hash = time_hash; 2835 2836 continue; 2837 } 2838 2839 /* 2840 * Test if we should deliver an upcall 2841 */ 2842 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2843 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2844 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2845 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2846 /* Prepare an upcall for delivery */ 2847 bw_meter_prepare_upcall(x, &now); 2848 } 2849 2850 /* 2851 * Reschedule for next processing 2852 */ 2853 schedule_bw_meter(x, &now); 2854 } 2855 } 2856 2857 /* Send all upcalls that are pending delivery */ 2858 bw_upcalls_send(); 2859 2860 MFC_UNLOCK(); 2861} 2862 2863/* 2864 * A periodic function for sending all upcalls that are pending delivery 2865 */ 2866static void 2867expire_bw_upcalls_send(void *unused) 2868{ 2869 MFC_LOCK(); 2870 bw_upcalls_send(); 2871 MFC_UNLOCK(); 2872 2873 callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, 2874 expire_bw_upcalls_send, NULL); 2875} 2876 2877/* 2878 * A periodic function for periodic scanning of the multicast forwarding 2879 * table for processing all "<=" bw_meter entries. 2880 */ 2881static void 2882expire_bw_meter_process(void *unused) 2883{ 2884 if (mrt_api_config & MRT_MFC_BW_UPCALL) 2885 bw_meter_process(); 2886 2887 callout_reset(&bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, NULL); 2888} 2889 2890/* 2891 * End of bandwidth monitoring code 2892 */ 2893 2894#ifdef PIM 2895/* 2896 * Send the packet up to the user daemon, or eventually do kernel encapsulation 2897 * 2898 */ 2899static int 2900pim_register_send(struct ip *ip, struct vif *vifp, 2901 struct mbuf *m, struct mfc *rt) 2902{ 2903 struct mbuf *mb_copy, *mm; 2904 2905 if (mrtdebug & DEBUG_PIM) 2906 log(LOG_DEBUG, "pim_register_send: "); 2907 2908 mb_copy = pim_register_prepare(ip, m); 2909 if (mb_copy == NULL) 2910 return ENOBUFS; 2911 2912 /* 2913 * Send all the fragments. Note that the mbuf for each fragment 2914 * is freed by the sending machinery. 2915 */ 2916 for (mm = mb_copy; mm; mm = mb_copy) { 2917 mb_copy = mm->m_nextpkt; 2918 mm->m_nextpkt = 0; 2919 mm = m_pullup(mm, sizeof(struct ip)); 2920 if (mm != NULL) { 2921 ip = mtod(mm, struct ip *); 2922 if ((mrt_api_config & MRT_MFC_RP) && 2923 (rt->mfc_rp.s_addr != INADDR_ANY)) { 2924 pim_register_send_rp(ip, vifp, mm, rt); 2925 } else { 2926 pim_register_send_upcall(ip, vifp, mm, rt); 2927 } 2928 } 2929 } 2930 2931 return 0; 2932} 2933 2934/* 2935 * Return a copy of the data packet that is ready for PIM Register 2936 * encapsulation. 2937 * XXX: Note that in the returned copy the IP header is a valid one. 2938 */ 2939static struct mbuf * 2940pim_register_prepare(struct ip *ip, struct mbuf *m) 2941{ 2942 struct mbuf *mb_copy = NULL; 2943 int mtu; 2944 2945 /* Take care of delayed checksums */ 2946 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 2947 in_delayed_cksum(m); 2948 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 2949 } 2950 2951 /* 2952 * Copy the old packet & pullup its IP header into the 2953 * new mbuf so we can modify it. 2954 */ 2955 mb_copy = m_copypacket(m, M_DONTWAIT); 2956 if (mb_copy == NULL) 2957 return NULL; 2958 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2); 2959 if (mb_copy == NULL) 2960 return NULL; 2961 2962 /* take care of the TTL */ 2963 ip = mtod(mb_copy, struct ip *); 2964 --ip->ip_ttl; 2965 2966 /* Compute the MTU after the PIM Register encapsulation */ 2967 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr); 2968 2969 if (ip->ip_len <= mtu) { 2970 /* Turn the IP header into a valid one */ 2971 ip->ip_len = htons(ip->ip_len); 2972 ip->ip_off = htons(ip->ip_off); 2973 ip->ip_sum = 0; 2974 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 2975 } else { 2976 /* Fragment the packet */ 2977 if (ip_fragment(ip, &mb_copy, mtu, 0, CSUM_DELAY_IP) != 0) { 2978 m_freem(mb_copy); 2979 return NULL; 2980 } 2981 } 2982 return mb_copy; 2983} 2984 2985/* 2986 * Send an upcall with the data packet to the user-level process. 2987 */ 2988static int 2989pim_register_send_upcall(struct ip *ip, struct vif *vifp, 2990 struct mbuf *mb_copy, struct mfc *rt) 2991{ 2992 struct mbuf *mb_first; 2993 int len = ntohs(ip->ip_len); 2994 struct igmpmsg *im; 2995 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2996 2997 VIF_LOCK_ASSERT(); 2998 2999 /* 3000 * Add a new mbuf with an upcall header 3001 */ 3002 MGETHDR(mb_first, M_DONTWAIT, MT_HEADER); 3003 if (mb_first == NULL) { 3004 m_freem(mb_copy); 3005 return ENOBUFS; 3006 } 3007 mb_first->m_data += max_linkhdr; 3008 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg); 3009 mb_first->m_len = sizeof(struct igmpmsg); 3010 mb_first->m_next = mb_copy; 3011 3012 /* Send message to routing daemon */ 3013 im = mtod(mb_first, struct igmpmsg *); 3014 im->im_msgtype = IGMPMSG_WHOLEPKT; 3015 im->im_mbz = 0; 3016 im->im_vif = vifp - viftable; 3017 im->im_src = ip->ip_src; 3018 im->im_dst = ip->ip_dst; 3019 3020 k_igmpsrc.sin_addr = ip->ip_src; 3021 3022 mrtstat.mrts_upcalls++; 3023 3024 if (socket_send(ip_mrouter, mb_first, &k_igmpsrc) < 0) { 3025 if (mrtdebug & DEBUG_PIM) 3026 log(LOG_WARNING, 3027 "mcast: pim_register_send_upcall: ip_mrouter socket queue full"); 3028 ++mrtstat.mrts_upq_sockfull; 3029 return ENOBUFS; 3030 } 3031 3032 /* Keep statistics */ 3033 pimstat.pims_snd_registers_msgs++; 3034 pimstat.pims_snd_registers_bytes += len; 3035 3036 return 0; 3037} 3038 3039/* 3040 * Encapsulate the data packet in PIM Register message and send it to the RP. 3041 */ 3042static int 3043pim_register_send_rp(struct ip *ip, struct vif *vifp, 3044 struct mbuf *mb_copy, struct mfc *rt) 3045{ 3046 struct mbuf *mb_first; 3047 struct ip *ip_outer; 3048 struct pim_encap_pimhdr *pimhdr; 3049 int len = ntohs(ip->ip_len); 3050 vifi_t vifi = rt->mfc_parent; 3051 3052 VIF_LOCK_ASSERT(); 3053 3054 if ((vifi >= numvifs) || (viftable[vifi].v_lcl_addr.s_addr == 0)) { 3055 m_freem(mb_copy); 3056 return EADDRNOTAVAIL; /* The iif vif is invalid */ 3057 } 3058 3059 /* 3060 * Add a new mbuf with the encapsulating header 3061 */ 3062 MGETHDR(mb_first, M_DONTWAIT, MT_HEADER); 3063 if (mb_first == NULL) { 3064 m_freem(mb_copy); 3065 return ENOBUFS; 3066 } 3067 mb_first->m_data += max_linkhdr; 3068 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 3069 mb_first->m_next = mb_copy; 3070 3071 mb_first->m_pkthdr.len = len + mb_first->m_len; 3072 3073 /* 3074 * Fill in the encapsulating IP and PIM header 3075 */ 3076 ip_outer = mtod(mb_first, struct ip *); 3077 *ip_outer = pim_encap_iphdr; 3078#ifdef RANDOM_IP_ID 3079 ip_outer->ip_id = ip_randomid(); 3080#else 3081 ip_outer->ip_id = htons(ip_id++); 3082#endif 3083 ip_outer->ip_len = len + sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 3084 ip_outer->ip_src = viftable[vifi].v_lcl_addr; 3085 ip_outer->ip_dst = rt->mfc_rp; 3086 /* 3087 * Copy the inner header TOS to the outer header, and take care of the 3088 * IP_DF bit. 3089 */ 3090 ip_outer->ip_tos = ip->ip_tos; 3091 if (ntohs(ip->ip_off) & IP_DF) 3092 ip_outer->ip_off |= IP_DF; 3093 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer 3094 + sizeof(pim_encap_iphdr)); 3095 *pimhdr = pim_encap_pimhdr; 3096 /* If the iif crosses a border, set the Border-bit */ 3097 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & mrt_api_config) 3098 pimhdr->flags |= htonl(PIM_BORDER_REGISTER); 3099 3100 mb_first->m_data += sizeof(pim_encap_iphdr); 3101 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr)); 3102 mb_first->m_data -= sizeof(pim_encap_iphdr); 3103 3104 if (vifp->v_rate_limit == 0) 3105 tbf_send_packet(vifp, mb_first); 3106 else 3107 tbf_control(vifp, mb_first, ip, ip_outer->ip_len); 3108 3109 /* Keep statistics */ 3110 pimstat.pims_snd_registers_msgs++; 3111 pimstat.pims_snd_registers_bytes += len; 3112 3113 return 0; 3114} 3115 3116/* 3117 * PIM-SMv2 and PIM-DM messages processing. 3118 * Receives and verifies the PIM control messages, and passes them 3119 * up to the listening socket, using rip_input(). 3120 * The only message with special processing is the PIM_REGISTER message 3121 * (used by PIM-SM): the PIM header is stripped off, and the inner packet 3122 * is passed to if_simloop(). 3123 */ 3124void 3125pim_input(struct mbuf *m, int off) 3126{ 3127 struct ip *ip = mtod(m, struct ip *); 3128 struct pim *pim; 3129 int minlen; 3130 int datalen = ip->ip_len; 3131 int ip_tos; 3132 int iphlen = off; 3133 3134 /* Keep statistics */ 3135 pimstat.pims_rcv_total_msgs++; 3136 pimstat.pims_rcv_total_bytes += datalen; 3137 3138 /* 3139 * Validate lengths 3140 */ 3141 if (datalen < PIM_MINLEN) { 3142 pimstat.pims_rcv_tooshort++; 3143 log(LOG_ERR, "pim_input: packet size too small %d from %lx\n", 3144 datalen, (u_long)ip->ip_src.s_addr); 3145 m_freem(m); 3146 return; 3147 } 3148 3149 /* 3150 * If the packet is at least as big as a REGISTER, go agead 3151 * and grab the PIM REGISTER header size, to avoid another 3152 * possible m_pullup() later. 3153 * 3154 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8 3155 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28 3156 */ 3157 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN); 3158 /* 3159 * Get the IP and PIM headers in contiguous memory, and 3160 * possibly the PIM REGISTER header. 3161 */ 3162 if ((m->m_flags & M_EXT || m->m_len < minlen) && 3163 (m = m_pullup(m, minlen)) == 0) { 3164 log(LOG_ERR, "pim_input: m_pullup failure\n"); 3165 return; 3166 } 3167 /* m_pullup() may have given us a new mbuf so reset ip. */ 3168 ip = mtod(m, struct ip *); 3169 ip_tos = ip->ip_tos; 3170 3171 /* adjust mbuf to point to the PIM header */ 3172 m->m_data += iphlen; 3173 m->m_len -= iphlen; 3174 pim = mtod(m, struct pim *); 3175 3176 /* 3177 * Validate checksum. If PIM REGISTER, exclude the data packet. 3178 * 3179 * XXX: some older PIMv2 implementations don't make this distinction, 3180 * so for compatibility reason perform the checksum over part of the 3181 * message, and if error, then over the whole message. 3182 */ 3183 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) { 3184 /* do nothing, checksum okay */ 3185 } else if (in_cksum(m, datalen)) { 3186 pimstat.pims_rcv_badsum++; 3187 if (mrtdebug & DEBUG_PIM) 3188 log(LOG_DEBUG, "pim_input: invalid checksum"); 3189 m_freem(m); 3190 return; 3191 } 3192 3193 /* PIM version check */ 3194 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) { 3195 pimstat.pims_rcv_badversion++; 3196 log(LOG_ERR, "pim_input: incorrect version %d, expecting %d\n", 3197 PIM_VT_V(pim->pim_vt), PIM_VERSION); 3198 m_freem(m); 3199 return; 3200 } 3201 3202 /* restore mbuf back to the outer IP */ 3203 m->m_data -= iphlen; 3204 m->m_len += iphlen; 3205 3206 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) { 3207 /* 3208 * Since this is a REGISTER, we'll make a copy of the register 3209 * headers ip + pim + u_int32 + encap_ip, to be passed up to the 3210 * routing daemon. 3211 */ 3212 struct sockaddr_in dst = { sizeof(dst), AF_INET }; 3213 struct mbuf *mcp; 3214 struct ip *encap_ip; 3215 u_int32_t *reghdr; 3216 struct ifnet *vifp; 3217 3218 VIF_LOCK(); 3219 if ((reg_vif_num >= numvifs) || (reg_vif_num == VIFI_INVALID)) { 3220 VIF_UNLOCK(); 3221 if (mrtdebug & DEBUG_PIM) 3222 log(LOG_DEBUG, 3223 "pim_input: register vif not set: %d\n", reg_vif_num); 3224 m_freem(m); 3225 return; 3226 } 3227 /* XXX need refcnt? */ 3228 vifp = viftable[reg_vif_num].v_ifp; 3229 VIF_UNLOCK(); 3230 3231 /* 3232 * Validate length 3233 */ 3234 if (datalen < PIM_REG_MINLEN) { 3235 pimstat.pims_rcv_tooshort++; 3236 pimstat.pims_rcv_badregisters++; 3237 log(LOG_ERR, 3238 "pim_input: register packet size too small %d from %lx\n", 3239 datalen, (u_long)ip->ip_src.s_addr); 3240 m_freem(m); 3241 return; 3242 } 3243 3244 reghdr = (u_int32_t *)(pim + 1); 3245 encap_ip = (struct ip *)(reghdr + 1); 3246 3247 if (mrtdebug & DEBUG_PIM) { 3248 log(LOG_DEBUG, 3249 "pim_input[register], encap_ip: %lx -> %lx, encap_ip len %d\n", 3250 (u_long)ntohl(encap_ip->ip_src.s_addr), 3251 (u_long)ntohl(encap_ip->ip_dst.s_addr), 3252 ntohs(encap_ip->ip_len)); 3253 } 3254 3255 /* verify the version number of the inner packet */ 3256 if (encap_ip->ip_v != IPVERSION) { 3257 pimstat.pims_rcv_badregisters++; 3258 if (mrtdebug & DEBUG_PIM) { 3259 log(LOG_DEBUG, "pim_input: invalid IP version (%d) " 3260 "of the inner packet\n", encap_ip->ip_v); 3261 } 3262 m_freem(m); 3263 return; 3264 } 3265 3266 /* verify the inner packet is destined to a mcast group */ 3267 if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) { 3268 pimstat.pims_rcv_badregisters++; 3269 if (mrtdebug & DEBUG_PIM) 3270 log(LOG_DEBUG, 3271 "pim_input: inner packet of register is not " 3272 "multicast %lx\n", 3273 (u_long)ntohl(encap_ip->ip_dst.s_addr)); 3274 m_freem(m); 3275 return; 3276 } 3277 3278 /* 3279 * Copy the TOS from the outer IP header to the inner IP header. 3280 */ 3281 if (encap_ip->ip_tos != ip_tos) { 3282 /* Outer TOS -> inner TOS */ 3283 encap_ip->ip_tos = ip_tos; 3284 /* Recompute the inner header checksum. Sigh... */ 3285 3286 /* adjust mbuf to point to the inner IP header */ 3287 m->m_data += (iphlen + PIM_MINLEN); 3288 m->m_len -= (iphlen + PIM_MINLEN); 3289 3290 encap_ip->ip_sum = 0; 3291 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2); 3292 3293 /* restore mbuf to point back to the outer IP header */ 3294 m->m_data -= (iphlen + PIM_MINLEN); 3295 m->m_len += (iphlen + PIM_MINLEN); 3296 } 3297 3298 /* If a NULL_REGISTER, pass it to the daemon */ 3299 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 3300 goto pim_input_to_daemon; 3301 3302 /* 3303 * Decapsulate the inner IP packet and loopback to forward it 3304 * as a normal multicast packet. Also, make a copy of the 3305 * outer_iphdr + pimhdr + reghdr + encap_iphdr 3306 * to pass to the daemon later, so it can take the appropriate 3307 * actions (e.g., send back PIM_REGISTER_STOP). 3308 * XXX: here m->m_data points to the outer IP header. 3309 */ 3310 mcp = m_copy(m, 0, iphlen + PIM_REG_MINLEN); 3311 if (mcp == NULL) { 3312 log(LOG_ERR, 3313 "pim_input: pim register: could not copy register head\n"); 3314 m_freem(m); 3315 return; 3316 } 3317 3318 /* Keep statistics */ 3319 /* XXX: registers_bytes include only the encap. mcast pkt */ 3320 pimstat.pims_rcv_registers_msgs++; 3321 pimstat.pims_rcv_registers_bytes += ntohs(encap_ip->ip_len); 3322 3323 /* 3324 * forward the inner ip packet; point m_data at the inner ip. 3325 */ 3326 m_adj(m, iphlen + PIM_MINLEN); 3327 3328 if (mrtdebug & DEBUG_PIM) { 3329 log(LOG_DEBUG, 3330 "pim_input: forwarding decapsulated register: " 3331 "src %lx, dst %lx, vif %d\n", 3332 (u_long)ntohl(encap_ip->ip_src.s_addr), 3333 (u_long)ntohl(encap_ip->ip_dst.s_addr), 3334 reg_vif_num); 3335 } 3336 /* NB: vifp was collected above; can it change on us? */ 3337 if_simloop(vifp, m, dst.sin_family, 0); 3338 3339 /* prepare the register head to send to the mrouting daemon */ 3340 m = mcp; 3341 } 3342 3343pim_input_to_daemon: 3344 /* 3345 * Pass the PIM message up to the daemon; if it is a Register message, 3346 * pass the 'head' only up to the daemon. This includes the 3347 * outer IP header, PIM header, PIM-Register header and the 3348 * inner IP header. 3349 * XXX: the outer IP header pkt size of a Register is not adjust to 3350 * reflect the fact that the inner multicast data is truncated. 3351 */ 3352 rip_input(m, iphlen); 3353 3354 return; 3355} 3356#endif /* PIM */ 3357 3358static int 3359ip_mroute_modevent(module_t mod, int type, void *unused) 3360{ 3361 int s; 3362 3363 switch (type) { 3364 case MOD_LOAD: 3365 s = splnet(); 3366 ip_mrouter_reset(); 3367 /* XXX synchronize setup */ 3368 ip_mcast_src = X_ip_mcast_src; 3369 ip_mforward = X_ip_mforward; 3370 ip_mrouter_done = X_ip_mrouter_done; 3371 ip_mrouter_get = X_ip_mrouter_get; 3372 ip_mrouter_set = X_ip_mrouter_set; 3373 ip_rsvp_force_done = X_ip_rsvp_force_done; 3374 ip_rsvp_vif = X_ip_rsvp_vif; 3375 legal_vif_num = X_legal_vif_num; 3376 mrt_ioctl = X_mrt_ioctl; 3377 rsvp_input_p = X_rsvp_input; 3378 break; 3379 3380 case MOD_UNLOAD: 3381 /* 3382 * Typically module unload happens after the user-level 3383 * process has shutdown the kernel services (the check 3384 * below insures someone can't just yank the module out 3385 * from under a running process). But if the module is 3386 * just loaded and then unloaded w/o starting up a user 3387 * process we still need to cleanup. 3388 */ 3389 if (ip_mrouter) 3390 return EINVAL; 3391 3392 X_ip_mrouter_done(); 3393 ip_mcast_src = NULL; 3394 ip_mforward = NULL; 3395 ip_mrouter_done = NULL; 3396 ip_mrouter_get = NULL; 3397 ip_mrouter_set = NULL; 3398 ip_rsvp_force_done = NULL; 3399 ip_rsvp_vif = NULL; 3400 legal_vif_num = NULL; 3401 mrt_ioctl = NULL; 3402 rsvp_input_p = NULL; 3403 break; 3404 } 3405 return 0; 3406} 3407 3408static moduledata_t ip_mroutemod = { 3409 "ip_mroute", 3410 ip_mroute_modevent, 3411 0 3412}; 3413DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 3414