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: src/sys/netinet/ip_mroute.c,v 1.56.2.10 2003/08/24 21:37:34 hsu Exp $ 21 */ 22 23 #include "opt_mrouting.h" 24 25 #ifdef PIM 26 #define _PIM_VT 1 27 #endif 28 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/malloc.h> 32 #include <sys/mbuf.h> 33 #include <sys/protosw.h> 34 #include <sys/socket.h> 35 #include <sys/socketvar.h> 36 #include <sys/sockio.h> 37 #include <sys/sysctl.h> 38 #include <sys/syslog.h> 39 #include <sys/systm.h> 40 #include <sys/time.h> 41 #include <sys/in_cksum.h> 42 43 #include <machine/stdarg.h> 44 45 #include <net/if.h> 46 #include <net/netisr.h> 47 #include <net/route.h> 48 #include <netinet/in.h> 49 #include <netinet/igmp.h> 50 #include <netinet/in_systm.h> 51 #include <netinet/in_var.h> 52 #include <netinet/ip.h> 53 #include "ip_mroute.h" 54 #include <netinet/ip_var.h> 55 #ifdef PIM 56 #include <netinet/pim.h> 57 #include <netinet/pim_var.h> 58 #endif 59 #ifdef ALTQ 60 #include <netinet/in_pcb.h> 61 #endif 62 #include <netinet/udp.h> 63 64 /* 65 * Control debugging code for rsvp and multicast routing code. 66 * Can only set them with the debugger. 67 */ 68 static u_int rsvpdebug; /* non-zero enables debugging */ 69 70 static u_int mrtdebug; /* any set of the flags below */ 71 72 #define DEBUG_MFC 0x02 73 #define DEBUG_FORWARD 0x04 74 #define DEBUG_EXPIRE 0x08 75 #define DEBUG_XMIT 0x10 76 #define DEBUG_PIM 0x20 77 78 #define VIFI_INVALID ((vifi_t) -1) 79 80 #define M_HASCL(m) ((m)->m_flags & M_EXT) 81 82 static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast routing tables"); 83 84 static struct mrtstat mrtstat; 85 SYSCTL_STRUCT(_net_inet_ip, OID_AUTO, mrtstat, CTLFLAG_RW, 86 &mrtstat, mrtstat, 87 "Multicast Routing Statistics (struct mrtstat, netinet/ip_mroute.h)"); 88 89 static struct mfc *mfctable[MFCTBLSIZ]; 90 SYSCTL_OPAQUE(_net_inet_ip, OID_AUTO, mfctable, CTLFLAG_RD, 91 &mfctable, sizeof(mfctable), "S,*mfc[MFCTBLSIZ]", 92 "Multicast Forwarding Table (struct *mfc[MFCTBLSIZ], netinet/ip_mroute.h)"); 93 94 static struct vif viftable[MAXVIFS]; 95 SYSCTL_OPAQUE(_net_inet_ip, OID_AUTO, viftable, CTLFLAG_RD, 96 &viftable, sizeof(viftable), "S,vif[MAXVIFS]", 97 "Multicast Virtual Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)"); 98 99 static u_char nexpire[MFCTBLSIZ]; 100 101 struct lwkt_token mroute_token = LWKT_TOKEN_INITIALIZER(mroute_token); 102 103 104 static struct callout expire_upcalls_ch; 105 static struct callout tbf_reprocess_q_ch; 106 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 107 #define UPCALL_EXPIRE 6 /* number of timeouts */ 108 109 /* 110 * Define the token bucket filter structures 111 * tbftable -> each vif has one of these for storing info 112 */ 113 114 static struct tbf tbftable[MAXVIFS]; 115 #define TBF_REPROCESS (hz / 100) /* 100x / second */ 116 117 /* 118 * 'Interfaces' associated with decapsulator (so we can tell 119 * packets that went through it from ones that get reflected 120 * by a broken gateway). These interfaces are never linked into 121 * the system ifnet list & no routes point to them. I.e., packets 122 * can't be sent this way. They only exist as a placeholder for 123 * multicast source verification. 124 */ 125 static struct ifnet multicast_decap_if[MAXVIFS]; 126 127 #define ENCAP_TTL 64 128 #define ENCAP_PROTO IPPROTO_IPIP /* 4 */ 129 130 /* prototype IP hdr for encapsulated packets */ 131 static struct ip multicast_encap_iphdr = { 132 #if BYTE_ORDER == LITTLE_ENDIAN 133 sizeof(struct ip) >> 2, IPVERSION, 134 #else 135 IPVERSION, sizeof(struct ip) >> 2, 136 #endif 137 0, /* tos */ 138 sizeof(struct ip), /* total length */ 139 0, /* id */ 140 0, /* frag offset */ 141 ENCAP_TTL, ENCAP_PROTO, 142 0, /* checksum */ 143 }; 144 145 /* 146 * Bandwidth meter variables and constants 147 */ 148 static MALLOC_DEFINE(M_BWMETER, "bwmeter", "multicast upcall bw meters"); 149 /* 150 * Pending timeouts are stored in a hash table, the key being the 151 * expiration time. Periodically, the entries are analysed and processed. 152 */ 153 #define BW_METER_BUCKETS 1024 154 static struct bw_meter *bw_meter_timers[BW_METER_BUCKETS]; 155 static struct callout bw_meter_ch; 156 #define BW_METER_PERIOD (hz) /* periodical handling of bw meters */ 157 158 /* 159 * Pending upcalls are stored in a vector which is flushed when 160 * full, or periodically 161 */ 162 static struct bw_upcall bw_upcalls[BW_UPCALLS_MAX]; 163 static u_int bw_upcalls_n; /* # of pending upcalls */ 164 static struct callout bw_upcalls_ch; 165 #define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */ 166 167 #ifdef PIM 168 static struct pimstat pimstat; 169 SYSCTL_STRUCT(_net_inet_pim, PIMCTL_STATS, stats, CTLFLAG_RD, 170 &pimstat, pimstat, 171 "PIM Statistics (struct pimstat, netinet/pim_var.h)"); 172 173 /* 174 * Note: the PIM Register encapsulation adds the following in front of a 175 * data packet: 176 * 177 * struct pim_encap_hdr { 178 * struct ip ip; 179 * struct pim_encap_pimhdr pim; 180 * } 181 * 182 */ 183 184 struct pim_encap_pimhdr { 185 struct pim pim; 186 uint32_t flags; 187 }; 188 189 static struct ip pim_encap_iphdr = { 190 #if BYTE_ORDER == LITTLE_ENDIAN 191 sizeof(struct ip) >> 2, 192 IPVERSION, 193 #else 194 IPVERSION, 195 sizeof(struct ip) >> 2, 196 #endif 197 0, /* tos */ 198 sizeof(struct ip), /* total length */ 199 0, /* id */ 200 0, /* frag offset */ 201 ENCAP_TTL, 202 IPPROTO_PIM, 203 0, /* checksum */ 204 }; 205 206 static struct pim_encap_pimhdr pim_encap_pimhdr = { 207 { 208 PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */ 209 0, /* reserved */ 210 0, /* checksum */ 211 }, 212 0 /* flags */ 213 }; 214 215 static struct ifnet multicast_register_if; 216 static vifi_t reg_vif_num = VIFI_INVALID; 217 #endif /* PIM */ 218 219 /* 220 * Private variables. 221 */ 222 static vifi_t numvifs; 223 static int have_encap_tunnel; 224 225 /* 226 * one-back cache used by ipip_input to locate a tunnel's vif 227 * given a datagram's src ip address. 228 */ 229 static u_long last_encap_src; 230 static struct vif *last_encap_vif; 231 232 static u_long X_ip_mcast_src(int vifi); 233 static int X_ip_mforward(struct ip *ip, struct ifnet *ifp, 234 struct mbuf *m, struct ip_moptions *imo); 235 static int X_ip_mrouter_done(void); 236 static int X_ip_mrouter_get(struct socket *so, struct sockopt *m); 237 static int X_ip_mrouter_set(struct socket *so, struct sockopt *m); 238 static int X_legal_vif_num(int vif); 239 static int X_mrt_ioctl(u_long cmd, caddr_t data); 240 241 static int get_sg_cnt(struct sioc_sg_req *); 242 static int get_vif_cnt(struct sioc_vif_req *); 243 static int ip_mrouter_init(struct socket *, int); 244 static int add_vif(struct vifctl *); 245 static int del_vif(vifi_t); 246 static int add_mfc(struct mfcctl2 *); 247 static int del_mfc(struct mfcctl2 *); 248 static int set_api_config(uint32_t *); /* chose API capabilities */ 249 static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *); 250 static int set_assert(int); 251 static void expire_upcalls(void *); 252 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t); 253 static void phyint_send(struct ip *, struct vif *, struct mbuf *); 254 static void encap_send(struct ip *, struct vif *, struct mbuf *); 255 static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long); 256 static void tbf_queue(struct vif *, struct mbuf *); 257 static void tbf_process_q(struct vif *); 258 static void tbf_reprocess_q(void *); 259 static int tbf_dq_sel(struct vif *, struct ip *); 260 static void tbf_send_packet(struct vif *, struct mbuf *); 261 static void tbf_update_tokens(struct vif *); 262 static int priority(struct vif *, struct ip *); 263 264 /* 265 * Bandwidth monitoring 266 */ 267 static void free_bw_list(struct bw_meter *list); 268 static int add_bw_upcall(struct bw_upcall *); 269 static int del_bw_upcall(struct bw_upcall *); 270 static void bw_meter_receive_packet(struct bw_meter *x, int plen, 271 struct timeval *nowp); 272 static void bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp); 273 static void bw_upcalls_send(void); 274 static void schedule_bw_meter(struct bw_meter *x, struct timeval *nowp); 275 static void unschedule_bw_meter(struct bw_meter *x); 276 static void bw_meter_process(void); 277 static void expire_bw_upcalls_send(void *); 278 static void expire_bw_meter_process(void *); 279 280 #ifdef PIM 281 static int pim_register_send(struct ip *, struct vif *, 282 struct mbuf *, struct mfc *); 283 static int pim_register_send_rp(struct ip *, struct vif *, 284 struct mbuf *, struct mfc *); 285 static int pim_register_send_upcall(struct ip *, struct vif *, 286 struct mbuf *, struct mfc *); 287 static struct mbuf *pim_register_prepare(struct ip *, struct mbuf *); 288 #endif 289 290 /* 291 * whether or not special PIM assert processing is enabled. 292 */ 293 static int pim_assert; 294 /* 295 * Rate limit for assert notification messages, in usec 296 */ 297 #define ASSERT_MSG_TIME 3000000 298 299 /* 300 * Kernel multicast routing API capabilities and setup. 301 * If more API capabilities are added to the kernel, they should be 302 * recorded in `mrt_api_support'. 303 */ 304 static const uint32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF | 305 MRT_MFC_FLAGS_BORDER_VIF | 306 MRT_MFC_RP | 307 MRT_MFC_BW_UPCALL); 308 static uint32_t mrt_api_config = 0; 309 310 /* 311 * Hash function for a source, group entry 312 */ 313 #define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \ 314 ((g) >> 20) ^ ((g) >> 10) ^ (g)) 315 316 /* 317 * Find a route for a given origin IP address and Multicast group address 318 * Type of service parameter to be added in the future!!! 319 * Statistics are updated by the caller if needed 320 * (mrtstat.mrts_mfc_lookups and mrtstat.mrts_mfc_misses) 321 */ 322 static struct mfc * 323 mfc_find(in_addr_t o, in_addr_t g) 324 { 325 struct mfc *rt; 326 327 for (rt = mfctable[MFCHASH(o,g)]; rt; rt = rt->mfc_next) 328 if ((rt->mfc_origin.s_addr == o) && 329 (rt->mfc_mcastgrp.s_addr == g) && (rt->mfc_stall == NULL)) 330 break; 331 return rt; 332 } 333 334 /* 335 * Macros to compute elapsed time efficiently 336 * Borrowed from Van Jacobson's scheduling code 337 */ 338 #define TV_DELTA(a, b, delta) { \ 339 int xxs; \ 340 delta = (a).tv_usec - (b).tv_usec; \ 341 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 342 switch (xxs) { \ 343 case 2: \ 344 delta += 1000000; \ 345 /* FALLTHROUGH */ \ 346 case 1: \ 347 delta += 1000000; \ 348 break; \ 349 default: \ 350 delta += (1000000 * xxs); \ 351 } \ 352 } \ 353 } 354 355 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 356 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 357 358 /* 359 * Handle MRT setsockopt commands to modify the multicast routing tables. 360 */ 361 static int 362 X_ip_mrouter_set(struct socket *so, struct sockopt *sopt) 363 { 364 int error, optval; 365 vifi_t vifi; 366 struct vifctl vifc; 367 struct mfcctl2 mfc; 368 struct bw_upcall bw_upcall; 369 uint32_t i; 370 371 if (so != ip_mrouter && sopt->sopt_name != MRT_INIT) 372 return EPERM; 373 374 error = 0; 375 switch (sopt->sopt_name) { 376 case MRT_INIT: 377 error = soopt_to_kbuf(sopt, &optval, sizeof optval, sizeof optval); 378 if (error) 379 break; 380 error = ip_mrouter_init(so, optval); 381 break; 382 383 case MRT_DONE: 384 error = ip_mrouter_done(); 385 break; 386 387 case MRT_ADD_VIF: 388 error = soopt_to_kbuf(sopt, &vifc, sizeof vifc, sizeof vifc); 389 if (error) 390 break; 391 error = add_vif(&vifc); 392 break; 393 394 case MRT_DEL_VIF: 395 error = soopt_to_kbuf(sopt, &vifi, sizeof vifi, sizeof vifi); 396 if (error) 397 break; 398 error = del_vif(vifi); 399 break; 400 401 case MRT_ADD_MFC: 402 case MRT_DEL_MFC: 403 /* 404 * select data size depending on API version. 405 */ 406 if (sopt->sopt_name == MRT_ADD_MFC && 407 mrt_api_config & MRT_API_FLAGS_ALL) { 408 error = soopt_to_kbuf(sopt, &mfc, sizeof(struct mfcctl2), 409 sizeof(struct mfcctl2)); 410 } else { 411 error = soopt_to_kbuf(sopt, &mfc, sizeof(struct mfcctl), 412 sizeof(struct mfcctl)); 413 bzero((caddr_t)&mfc + sizeof(struct mfcctl), 414 sizeof(mfc) - sizeof(struct mfcctl)); 415 } 416 if (error) 417 break; 418 if (sopt->sopt_name == MRT_ADD_MFC) 419 error = add_mfc(&mfc); 420 else 421 error = del_mfc(&mfc); 422 break; 423 424 case MRT_ASSERT: 425 error = soopt_to_kbuf(sopt, &optval, sizeof optval, sizeof optval); 426 if (error) 427 break; 428 set_assert(optval); 429 break; 430 431 case MRT_API_CONFIG: 432 error = soopt_to_kbuf(sopt, &i, sizeof i, sizeof i); 433 if (!error) 434 error = set_api_config(&i); 435 if (!error) 436 soopt_from_kbuf(sopt, &i, sizeof i); 437 break; 438 439 case MRT_ADD_BW_UPCALL: 440 case MRT_DEL_BW_UPCALL: 441 error = soopt_to_kbuf(sopt, &bw_upcall, sizeof bw_upcall, sizeof bw_upcall); 442 if (error) 443 break; 444 if (sopt->sopt_name == MRT_ADD_BW_UPCALL) 445 error = add_bw_upcall(&bw_upcall); 446 else 447 error = del_bw_upcall(&bw_upcall); 448 break; 449 450 default: 451 error = EOPNOTSUPP; 452 break; 453 } 454 return error; 455 } 456 457 /* 458 * Handle MRT getsockopt commands 459 */ 460 static int 461 X_ip_mrouter_get(struct socket *so, struct sockopt *sopt) 462 { 463 int error; 464 static int version = 0x0305; /* !!! why is this here? XXX */ 465 466 error = 0; 467 switch (sopt->sopt_name) { 468 case MRT_VERSION: 469 soopt_from_kbuf(sopt, &version, sizeof version); 470 break; 471 472 case MRT_ASSERT: 473 soopt_from_kbuf(sopt, &pim_assert, sizeof pim_assert); 474 break; 475 476 case MRT_API_SUPPORT: 477 soopt_from_kbuf(sopt, &mrt_api_support, sizeof mrt_api_support); 478 break; 479 480 case MRT_API_CONFIG: 481 soopt_from_kbuf(sopt, &mrt_api_config, sizeof mrt_api_config); 482 break; 483 484 default: 485 error = EOPNOTSUPP; 486 break; 487 } 488 return error; 489 } 490 491 /* 492 * Handle ioctl commands to obtain information from the cache 493 */ 494 static int 495 X_mrt_ioctl(u_long cmd, caddr_t data) 496 { 497 int error = 0; 498 499 switch (cmd) { 500 case SIOCGETVIFCNT: 501 error = get_vif_cnt((struct sioc_vif_req *)data); 502 break; 503 504 case SIOCGETSGCNT: 505 error = get_sg_cnt((struct sioc_sg_req *)data); 506 break; 507 508 default: 509 error = EINVAL; 510 break; 511 } 512 return error; 513 } 514 515 /* 516 * returns the packet, byte, rpf-failure count for the source group provided 517 */ 518 static int 519 get_sg_cnt(struct sioc_sg_req *req) 520 { 521 struct mfc *rt; 522 523 lwkt_gettoken(&mroute_token); 524 rt = mfc_find(req->src.s_addr, req->grp.s_addr); 525 if (rt == NULL) { 526 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 527 lwkt_reltoken(&mroute_token); 528 return EADDRNOTAVAIL; 529 } 530 req->pktcnt = rt->mfc_pkt_cnt; 531 req->bytecnt = rt->mfc_byte_cnt; 532 req->wrong_if = rt->mfc_wrong_if; 533 lwkt_reltoken(&mroute_token); 534 return 0; 535 } 536 537 /* 538 * returns the input and output packet and byte counts on the vif provided 539 */ 540 static int 541 get_vif_cnt(struct sioc_vif_req *req) 542 { 543 vifi_t vifi = req->vifi; 544 545 if (vifi >= numvifs) 546 return EINVAL; 547 548 req->icount = viftable[vifi].v_pkt_in; 549 req->ocount = viftable[vifi].v_pkt_out; 550 req->ibytes = viftable[vifi].v_bytes_in; 551 req->obytes = viftable[vifi].v_bytes_out; 552 553 return 0; 554 } 555 556 /* 557 * Enable multicast routing 558 */ 559 static int 560 ip_mrouter_init(struct socket *so, int version) 561 { 562 if (mrtdebug) 563 log(LOG_DEBUG, "ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 564 so->so_type, so->so_proto->pr_protocol); 565 566 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP) 567 return EOPNOTSUPP; 568 569 if (version != 1) 570 return ENOPROTOOPT; 571 572 if (ip_mrouter != NULL) 573 return EADDRINUSE; 574 575 ip_mrouter = so; 576 577 bzero((caddr_t)mfctable, sizeof(mfctable)); 578 bzero((caddr_t)nexpire, sizeof(nexpire)); 579 580 pim_assert = 0; 581 bw_upcalls_n = 0; 582 bzero((caddr_t)bw_meter_timers, sizeof(bw_meter_timers)); 583 584 callout_init(&expire_upcalls_ch); 585 callout_init(&bw_upcalls_ch); 586 callout_init(&bw_meter_ch); 587 callout_init(&tbf_reprocess_q_ch); 588 589 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, NULL); 590 callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, 591 expire_bw_upcalls_send, NULL); 592 callout_reset(&bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, NULL); 593 594 mrt_api_config = 0; 595 596 if (mrtdebug) 597 log(LOG_DEBUG, "ip_mrouter_init\n"); 598 599 return 0; 600 } 601 602 /* 603 * Disable multicast routing 604 */ 605 static int 606 X_ip_mrouter_done(void) 607 { 608 vifi_t vifi; 609 int i; 610 struct ifnet *ifp; 611 struct ifreq ifr; 612 struct mfc *rt; 613 struct rtdetq *rte; 614 615 lwkt_gettoken(&mroute_token); 616 617 /* 618 * For each phyint in use, disable promiscuous reception of all IP 619 * multicasts. 620 */ 621 for (vifi = 0; vifi < numvifs; vifi++) { 622 if (viftable[vifi].v_lcl_addr.s_addr != 0 && 623 !(viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) { 624 struct sockaddr_in *so = (struct sockaddr_in *)&(ifr.ifr_addr); 625 626 so->sin_len = sizeof(struct sockaddr_in); 627 so->sin_family = AF_INET; 628 so->sin_addr.s_addr = INADDR_ANY; 629 ifp = viftable[vifi].v_ifp; 630 if_allmulti(ifp, 0); 631 } 632 } 633 bzero((caddr_t)tbftable, sizeof(tbftable)); 634 bzero((caddr_t)viftable, sizeof(viftable)); 635 numvifs = 0; 636 pim_assert = 0; 637 638 callout_stop(&expire_upcalls_ch); 639 640 mrt_api_config = 0; 641 bw_upcalls_n = 0; 642 callout_stop(&bw_upcalls_ch); 643 callout_stop(&bw_meter_ch); 644 callout_stop(&tbf_reprocess_q_ch); 645 646 /* 647 * Free all multicast forwarding cache entries. 648 */ 649 for (i = 0; i < MFCTBLSIZ; i++) { 650 for (rt = mfctable[i]; rt != NULL; ) { 651 struct mfc *nr = rt->mfc_next; 652 653 for (rte = rt->mfc_stall; rte != NULL; ) { 654 struct rtdetq *n = rte->next; 655 656 m_freem(rte->m); 657 kfree(rte, M_MRTABLE); 658 rte = n; 659 } 660 free_bw_list(rt->mfc_bw_meter); 661 kfree(rt, M_MRTABLE); 662 rt = nr; 663 } 664 } 665 666 bzero((caddr_t)mfctable, sizeof(mfctable)); 667 668 bzero(bw_meter_timers, sizeof(bw_meter_timers)); 669 670 /* 671 * Reset de-encapsulation cache 672 */ 673 last_encap_src = INADDR_ANY; 674 last_encap_vif = NULL; 675 #ifdef PIM 676 reg_vif_num = VIFI_INVALID; 677 #endif 678 have_encap_tunnel = 0; 679 680 ip_mrouter = NULL; 681 682 lwkt_reltoken(&mroute_token); 683 684 if (mrtdebug) 685 log(LOG_DEBUG, "ip_mrouter_done\n"); 686 687 return 0; 688 } 689 690 /* 691 * Set PIM assert processing global 692 */ 693 static int 694 set_assert(int i) 695 { 696 if ((i != 1) && (i != 0)) 697 return EINVAL; 698 699 pim_assert = i; 700 701 return 0; 702 } 703 704 /* 705 * Configure API capabilities 706 */ 707 static int 708 set_api_config(uint32_t *apival) 709 { 710 int i; 711 712 /* 713 * We can set the API capabilities only if it is the first operation 714 * after MRT_INIT. I.e.: 715 * - there are no vifs installed 716 * - pim_assert is not enabled 717 * - the MFC table is empty 718 */ 719 if (numvifs > 0) { 720 *apival = 0; 721 return EPERM; 722 } 723 if (pim_assert) { 724 *apival = 0; 725 return EPERM; 726 } 727 for (i = 0; i < MFCTBLSIZ; i++) { 728 if (mfctable[i] != NULL) { 729 *apival = 0; 730 return EPERM; 731 } 732 } 733 734 mrt_api_config = *apival & mrt_api_support; 735 *apival = mrt_api_config; 736 737 return 0; 738 } 739 740 /* 741 * Add a vif to the vif table 742 */ 743 static int 744 add_vif(struct vifctl *vifcp) 745 { 746 struct vif *vifp = viftable + vifcp->vifc_vifi; 747 struct sockaddr_in sin = {sizeof sin, AF_INET}; 748 struct ifaddr *ifa; 749 struct ifnet *ifp; 750 int error, i; 751 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi; 752 753 if (vifcp->vifc_vifi >= MAXVIFS) 754 return EINVAL; 755 if (vifp->v_lcl_addr.s_addr != INADDR_ANY) 756 return EADDRINUSE; 757 if (vifcp->vifc_lcl_addr.s_addr == INADDR_ANY) 758 return EADDRNOTAVAIL; 759 760 /* Find the interface with an address in AF_INET family */ 761 #ifdef PIM 762 if (vifcp->vifc_flags & VIFF_REGISTER) { 763 /* 764 * XXX: Because VIFF_REGISTER does not really need a valid 765 * local interface (e.g. it could be 127.0.0.2), we don't 766 * check its address. 767 */ 768 ifp = NULL; 769 } else 770 #endif 771 { 772 sin.sin_addr = vifcp->vifc_lcl_addr; 773 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 774 if (ifa == NULL) 775 return EADDRNOTAVAIL; 776 ifp = ifa->ifa_ifp; 777 } 778 779 if (vifcp->vifc_flags & VIFF_TUNNEL) { 780 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) { 781 /* 782 * An encapsulating tunnel is wanted. Tell ipip_input() to 783 * start paying attention to encapsulated packets. 784 */ 785 if (have_encap_tunnel == 0) { 786 have_encap_tunnel = 1; 787 for (i = 0; i < MAXVIFS; i++) { 788 if_initname(&multicast_decap_if[i], "mdecap", i); 789 } 790 } 791 /* 792 * Set interface to fake encapsulator interface 793 */ 794 ifp = &multicast_decap_if[vifcp->vifc_vifi]; 795 /* 796 * Prepare cached route entry 797 */ 798 bzero(&vifp->v_route, sizeof(vifp->v_route)); 799 } else { 800 log(LOG_ERR, "source routed tunnels not supported\n"); 801 return EOPNOTSUPP; 802 } 803 #ifdef PIM 804 } else if (vifcp->vifc_flags & VIFF_REGISTER) { 805 ifp = &multicast_register_if; 806 if (mrtdebug) 807 log(LOG_DEBUG, "Adding a register vif, ifp: %p\n", 808 (void *)&multicast_register_if); 809 if (reg_vif_num == VIFI_INVALID) { 810 if_initname(&multicast_register_if, "register_vif", 0); 811 multicast_register_if.if_flags = IFF_LOOPBACK; 812 bzero(&vifp->v_route, sizeof(vifp->v_route)); 813 reg_vif_num = vifcp->vifc_vifi; 814 } 815 #endif 816 } else { /* Make sure the interface supports multicast */ 817 if ((ifp->if_flags & IFF_MULTICAST) == 0) 818 return EOPNOTSUPP; 819 820 /* Enable promiscuous reception of all IP multicasts from the if */ 821 lwkt_gettoken(&mroute_token); 822 error = if_allmulti(ifp, 1); 823 lwkt_reltoken(&mroute_token); 824 if (error) 825 return error; 826 } 827 828 lwkt_gettoken(&mroute_token); 829 /* define parameters for the tbf structure */ 830 vifp->v_tbf = v_tbf; 831 GET_TIME(vifp->v_tbf->tbf_last_pkt_t); 832 vifp->v_tbf->tbf_n_tok = 0; 833 vifp->v_tbf->tbf_q_len = 0; 834 vifp->v_tbf->tbf_max_q_len = MAXQSIZE; 835 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL; 836 837 vifp->v_flags = vifcp->vifc_flags; 838 vifp->v_threshold = vifcp->vifc_threshold; 839 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 840 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 841 vifp->v_ifp = ifp; 842 /* scaling up here allows division by 1024 in critical code */ 843 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000; 844 vifp->v_rsvp_on = 0; 845 vifp->v_rsvpd = NULL; 846 /* initialize per vif pkt counters */ 847 vifp->v_pkt_in = 0; 848 vifp->v_pkt_out = 0; 849 vifp->v_bytes_in = 0; 850 vifp->v_bytes_out = 0; 851 852 /* Adjust numvifs up if the vifi is higher than numvifs */ 853 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1; 854 855 lwkt_reltoken(&mroute_token); 856 857 if (mrtdebug) 858 log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n", 859 vifcp->vifc_vifi, 860 (u_long)ntohl(vifcp->vifc_lcl_addr.s_addr), 861 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 862 (u_long)ntohl(vifcp->vifc_rmt_addr.s_addr), 863 vifcp->vifc_threshold, 864 vifcp->vifc_rate_limit); 865 866 return 0; 867 } 868 869 /* 870 * Delete a vif from the vif table 871 */ 872 static int 873 del_vif(vifi_t vifi) 874 { 875 struct vif *vifp; 876 877 if (vifi >= numvifs) 878 return EINVAL; 879 vifp = &viftable[vifi]; 880 if (vifp->v_lcl_addr.s_addr == INADDR_ANY) 881 return EADDRNOTAVAIL; 882 883 lwkt_gettoken(&mroute_token); 884 885 if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) 886 if_allmulti(vifp->v_ifp, 0); 887 888 if (vifp == last_encap_vif) { 889 last_encap_vif = NULL; 890 last_encap_src = INADDR_ANY; 891 } 892 893 /* 894 * Free packets queued at the interface 895 */ 896 while (vifp->v_tbf->tbf_q) { 897 struct mbuf *m = vifp->v_tbf->tbf_q; 898 899 vifp->v_tbf->tbf_q = m->m_nextpkt; 900 m_freem(m); 901 } 902 903 #ifdef PIM 904 if (vifp->v_flags & VIFF_REGISTER) 905 reg_vif_num = VIFI_INVALID; 906 #endif 907 908 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf))); 909 bzero((caddr_t)vifp, sizeof (*vifp)); 910 911 if (mrtdebug) 912 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs); 913 914 /* Adjust numvifs down */ 915 for (vifi = numvifs; vifi > 0; vifi--) 916 if (viftable[vifi-1].v_lcl_addr.s_addr != INADDR_ANY) 917 break; 918 numvifs = vifi; 919 920 lwkt_reltoken(&mroute_token); 921 922 return 0; 923 } 924 925 /* 926 * update an mfc entry without resetting counters and S,G addresses. 927 */ 928 static void 929 update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 930 { 931 int i; 932 933 rt->mfc_parent = mfccp->mfcc_parent; 934 for (i = 0; i < numvifs; i++) { 935 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 936 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & mrt_api_config & 937 MRT_MFC_FLAGS_ALL; 938 } 939 /* set the RP address */ 940 if (mrt_api_config & MRT_MFC_RP) 941 rt->mfc_rp = mfccp->mfcc_rp; 942 else 943 rt->mfc_rp.s_addr = INADDR_ANY; 944 } 945 946 /* 947 * fully initialize an mfc entry from the parameter. 948 */ 949 static void 950 init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 951 { 952 rt->mfc_origin = mfccp->mfcc_origin; 953 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 954 955 update_mfc_params(rt, mfccp); 956 957 /* initialize pkt counters per src-grp */ 958 rt->mfc_pkt_cnt = 0; 959 rt->mfc_byte_cnt = 0; 960 rt->mfc_wrong_if = 0; 961 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 962 } 963 964 965 /* 966 * Add an mfc entry 967 */ 968 static int 969 add_mfc(struct mfcctl2 *mfccp) 970 { 971 struct mfc *rt; 972 u_long hash; 973 struct rtdetq *rte; 974 u_short nstl; 975 976 rt = mfc_find(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 977 978 /* If an entry already exists, just update the fields */ 979 if (rt) { 980 if (mrtdebug & DEBUG_MFC) 981 log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n", 982 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 983 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 984 mfccp->mfcc_parent); 985 986 lwkt_gettoken(&mroute_token); 987 update_mfc_params(rt, mfccp); 988 lwkt_reltoken(&mroute_token); 989 return 0; 990 } 991 992 /* 993 * Find the entry for which the upcall was made and update 994 */ 995 lwkt_gettoken(&mroute_token); 996 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 997 for (rt = mfctable[hash], nstl = 0; rt; rt = rt->mfc_next) { 998 999 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 1000 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) && 1001 (rt->mfc_stall != NULL)) { 1002 1003 if (nstl++) 1004 log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n", 1005 "multiple kernel entries", 1006 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1007 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1008 mfccp->mfcc_parent, (void *)rt->mfc_stall); 1009 1010 if (mrtdebug & DEBUG_MFC) 1011 log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n", 1012 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1013 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1014 mfccp->mfcc_parent, (void *)rt->mfc_stall); 1015 1016 init_mfc_params(rt, mfccp); 1017 1018 rt->mfc_expire = 0; /* Don't clean this guy up */ 1019 nexpire[hash]--; 1020 1021 /* free packets Qed at the end of this entry */ 1022 for (rte = rt->mfc_stall; rte != NULL; ) { 1023 struct rtdetq *n = rte->next; 1024 1025 ip_mdq(rte->m, rte->ifp, rt, -1); 1026 m_freem(rte->m); 1027 kfree(rte, M_MRTABLE); 1028 rte = n; 1029 } 1030 rt->mfc_stall = NULL; 1031 } 1032 } 1033 1034 /* 1035 * It is possible that an entry is being inserted without an upcall 1036 */ 1037 if (nstl == 0) { 1038 if (mrtdebug & DEBUG_MFC) 1039 log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n", 1040 hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr), 1041 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1042 mfccp->mfcc_parent); 1043 1044 for (rt = mfctable[hash]; rt != NULL; rt = rt->mfc_next) { 1045 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 1046 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) { 1047 init_mfc_params(rt, mfccp); 1048 if (rt->mfc_expire) 1049 nexpire[hash]--; 1050 rt->mfc_expire = 0; 1051 break; /* XXX */ 1052 } 1053 } 1054 if (rt == NULL) { /* no upcall, so make a new entry */ 1055 rt = kmalloc(sizeof(*rt), M_MRTABLE, M_INTWAIT | M_NULLOK); 1056 if (rt == NULL) { 1057 lwkt_reltoken(&mroute_token); 1058 return ENOBUFS; 1059 } 1060 1061 init_mfc_params(rt, mfccp); 1062 rt->mfc_expire = 0; 1063 rt->mfc_stall = NULL; 1064 1065 rt->mfc_bw_meter = NULL; 1066 /* insert new entry at head of hash chain */ 1067 rt->mfc_next = mfctable[hash]; 1068 mfctable[hash] = rt; 1069 } 1070 } 1071 lwkt_reltoken(&mroute_token); 1072 return 0; 1073 } 1074 1075 /* 1076 * Delete an mfc entry 1077 */ 1078 static int 1079 del_mfc(struct mfcctl2 *mfccp) 1080 { 1081 struct in_addr origin; 1082 struct in_addr mcastgrp; 1083 struct mfc *rt; 1084 struct mfc **nptr; 1085 u_long hash; 1086 struct bw_meter *list; 1087 1088 origin = mfccp->mfcc_origin; 1089 mcastgrp = mfccp->mfcc_mcastgrp; 1090 1091 if (mrtdebug & DEBUG_MFC) 1092 log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n", 1093 (u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr)); 1094 1095 lwkt_gettoken(&mroute_token); 1096 1097 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr); 1098 for (nptr = &mfctable[hash]; (rt = *nptr) != NULL; nptr = &rt->mfc_next) 1099 if (origin.s_addr == rt->mfc_origin.s_addr && 1100 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr && 1101 rt->mfc_stall == NULL) 1102 break; 1103 if (rt == NULL) { 1104 lwkt_reltoken(&mroute_token); 1105 return EADDRNOTAVAIL; 1106 } 1107 1108 *nptr = rt->mfc_next; 1109 1110 /* 1111 * free the bw_meter entries 1112 */ 1113 list = rt->mfc_bw_meter; 1114 rt->mfc_bw_meter = NULL; 1115 lwkt_reltoken(&mroute_token); 1116 1117 kfree(rt, M_MRTABLE); 1118 free_bw_list(list); 1119 1120 return 0; 1121 } 1122 1123 /* 1124 * Send a message to mrouted on the multicast routing socket 1125 */ 1126 static int 1127 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src) 1128 { 1129 if (s) { 1130 if (ssb_appendaddr(&s->so_rcv, (struct sockaddr *)src, mm, NULL) != 0) { 1131 sorwakeup(s); 1132 return 0; 1133 } else 1134 soroverflow(s); 1135 } 1136 m_freem(mm); 1137 return -1; 1138 } 1139 1140 /* 1141 * IP multicast forwarding function. This function assumes that the packet 1142 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1143 * pointed to by "ifp", and the packet is to be relayed to other networks 1144 * that have members of the packet's destination IP multicast group. 1145 * 1146 * The packet is returned unscathed to the caller, unless it is 1147 * erroneous, in which case a non-zero return value tells the caller to 1148 * discard it. 1149 */ 1150 1151 #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1152 1153 static int 1154 X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m, 1155 struct ip_moptions *imo) 1156 { 1157 struct mfc *rt; 1158 vifi_t vifi; 1159 1160 if (mrtdebug & DEBUG_FORWARD) 1161 log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n", 1162 (u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), 1163 (void *)ifp); 1164 1165 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 || 1166 ((u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1167 /* 1168 * Packet arrived via a physical interface or 1169 * an encapsulated tunnel or a register_vif. 1170 */ 1171 } else { 1172 /* 1173 * Packet arrived through a source-route tunnel. 1174 * Source-route tunnels are no longer supported. 1175 */ 1176 static time_t last_log; 1177 if (last_log != time_uptime) { 1178 last_log = time_uptime; 1179 log(LOG_ERR, 1180 "ip_mforward: received source-routed packet from %lx\n", 1181 (u_long)ntohl(ip->ip_src.s_addr)); 1182 } 1183 return 1; 1184 } 1185 1186 if (imo && ((vifi = imo->imo_multicast_vif) < numvifs)) { 1187 if (ip->ip_ttl < 255) 1188 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1189 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1190 struct vif *vifp = viftable + vifi; 1191 1192 kprintf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s)\n", 1193 (long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr), 1194 vifi, 1195 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1196 vifp->v_ifp->if_xname); 1197 } 1198 return ip_mdq(m, ifp, NULL, vifi); 1199 } 1200 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1201 kprintf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n", 1202 (long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr)); 1203 if (!imo) 1204 kprintf("In fact, no options were specified at all\n"); 1205 } 1206 1207 /* 1208 * Don't forward a packet with time-to-live of zero or one, 1209 * or a packet destined to a local-only group. 1210 */ 1211 if (ip->ip_ttl <= 1 || ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP) 1212 return 0; 1213 1214 /* 1215 * Determine forwarding vifs from the forwarding cache table 1216 */ 1217 lwkt_gettoken(&mroute_token); 1218 ++mrtstat.mrts_mfc_lookups; 1219 rt = mfc_find(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1220 1221 /* Entry exists, so forward if necessary */ 1222 if (rt != NULL) { 1223 int ipres = ip_mdq(m, ifp, rt, -1); 1224 lwkt_reltoken(&mroute_token); 1225 return ipres; 1226 } else { 1227 /* 1228 * If we don't have a route for packet's origin, 1229 * Make a copy of the packet & send message to routing daemon 1230 */ 1231 1232 struct mbuf *mb0; 1233 struct rtdetq *rte; 1234 u_long hash; 1235 int hlen = ip->ip_hl << 2; 1236 1237 ++mrtstat.mrts_mfc_misses; 1238 1239 mrtstat.mrts_no_route++; 1240 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1241 log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n", 1242 (u_long)ntohl(ip->ip_src.s_addr), 1243 (u_long)ntohl(ip->ip_dst.s_addr)); 1244 1245 /* 1246 * Allocate mbufs early so that we don't do extra work if we are 1247 * just going to fail anyway. Make sure to pullup the header so 1248 * that other people can't step on it. 1249 */ 1250 rte = kmalloc((sizeof *rte), M_MRTABLE, M_INTWAIT | M_NULLOK); 1251 if (rte == NULL) { 1252 lwkt_reltoken(&mroute_token); 1253 return ENOBUFS; 1254 } 1255 1256 mb0 = m_copypacket(m, M_NOWAIT); 1257 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen)) 1258 mb0 = m_pullup(mb0, hlen); 1259 if (mb0 == NULL) { 1260 kfree(rte, M_MRTABLE); 1261 lwkt_reltoken(&mroute_token); 1262 return ENOBUFS; 1263 } 1264 1265 /* is there an upcall waiting for this flow ? */ 1266 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1267 for (rt = mfctable[hash]; rt; rt = rt->mfc_next) { 1268 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) && 1269 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) && 1270 (rt->mfc_stall != NULL)) 1271 break; 1272 } 1273 1274 if (rt == NULL) { 1275 int i; 1276 struct igmpmsg *im; 1277 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1278 struct mbuf *mm; 1279 1280 /* 1281 * Locate the vifi for the incoming interface for this packet. 1282 * If none found, drop packet. 1283 */ 1284 for (vifi=0; vifi < numvifs && viftable[vifi].v_ifp != ifp; vifi++) 1285 ; 1286 if (vifi >= numvifs) /* vif not found, drop packet */ 1287 goto non_fatal; 1288 1289 /* no upcall, so make a new entry */ 1290 rt = kmalloc(sizeof(*rt), M_MRTABLE, M_INTWAIT | M_NULLOK); 1291 if (rt == NULL) 1292 goto fail; 1293 1294 /* Make a copy of the header to send to the user level process */ 1295 mm = m_copym(mb0, 0, hlen, M_NOWAIT); 1296 if (mm == NULL) 1297 goto fail1; 1298 1299 /* 1300 * Send message to routing daemon to install 1301 * a route into the kernel table 1302 */ 1303 1304 im = mtod(mm, struct igmpmsg *); 1305 im->im_msgtype = IGMPMSG_NOCACHE; 1306 im->im_mbz = 0; 1307 im->im_vif = vifi; 1308 1309 mrtstat.mrts_upcalls++; 1310 1311 k_igmpsrc.sin_addr = ip->ip_src; 1312 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1313 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n"); 1314 ++mrtstat.mrts_upq_sockfull; 1315 fail1: 1316 kfree(rt, M_MRTABLE); 1317 fail: 1318 kfree(rte, M_MRTABLE); 1319 m_freem(mb0); 1320 lwkt_reltoken(&mroute_token); 1321 return ENOBUFS; 1322 } 1323 1324 /* insert new entry at head of hash chain */ 1325 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1326 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1327 rt->mfc_expire = UPCALL_EXPIRE; 1328 nexpire[hash]++; 1329 for (i = 0; i < numvifs; i++) { 1330 rt->mfc_ttls[i] = 0; 1331 rt->mfc_flags[i] = 0; 1332 } 1333 rt->mfc_parent = -1; 1334 1335 rt->mfc_rp.s_addr = INADDR_ANY; /* clear the RP address */ 1336 1337 rt->mfc_bw_meter = NULL; 1338 1339 /* link into table */ 1340 rt->mfc_next = mfctable[hash]; 1341 mfctable[hash] = rt; 1342 rt->mfc_stall = rte; 1343 1344 } else { 1345 /* determine if q has overflowed */ 1346 int npkts = 0; 1347 struct rtdetq **p; 1348 1349 /* 1350 * XXX ouch! we need to append to the list, but we 1351 * only have a pointer to the front, so we have to 1352 * scan the entire list every time. 1353 */ 1354 for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next) 1355 npkts++; 1356 1357 if (npkts > MAX_UPQ) { 1358 mrtstat.mrts_upq_ovflw++; 1359 non_fatal: 1360 kfree(rte, M_MRTABLE); 1361 m_freem(mb0); 1362 lwkt_reltoken(&mroute_token); 1363 return 0; 1364 } 1365 1366 /* Add this entry to the end of the queue */ 1367 *p = rte; 1368 } 1369 1370 rte->m = mb0; 1371 rte->ifp = ifp; 1372 rte->next = NULL; 1373 1374 lwkt_reltoken(&mroute_token); 1375 return 0; 1376 } 1377 } 1378 1379 /* 1380 * Clean up the cache entry if upcall is not serviced 1381 */ 1382 static void 1383 expire_upcalls(void *unused) 1384 { 1385 struct rtdetq *rte; 1386 struct mfc *mfc, **nptr; 1387 int i; 1388 1389 lwkt_gettoken(&mroute_token); 1390 for (i = 0; i < MFCTBLSIZ; i++) { 1391 if (nexpire[i] == 0) 1392 continue; 1393 nptr = &mfctable[i]; 1394 for (mfc = *nptr; mfc != NULL; mfc = *nptr) { 1395 /* 1396 * Skip real cache entries 1397 * Make sure it wasn't marked to not expire (shouldn't happen) 1398 * If it expires now 1399 */ 1400 if (mfc->mfc_stall != NULL && mfc->mfc_expire != 0 && 1401 --mfc->mfc_expire == 0) { 1402 if (mrtdebug & DEBUG_EXPIRE) 1403 log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n", 1404 (u_long)ntohl(mfc->mfc_origin.s_addr), 1405 (u_long)ntohl(mfc->mfc_mcastgrp.s_addr)); 1406 /* 1407 * drop all the packets 1408 * free the mbuf with the pkt, if, timing info 1409 */ 1410 for (rte = mfc->mfc_stall; rte; ) { 1411 struct rtdetq *n = rte->next; 1412 1413 m_freem(rte->m); 1414 kfree(rte, M_MRTABLE); 1415 rte = n; 1416 } 1417 ++mrtstat.mrts_cache_cleanups; 1418 nexpire[i]--; 1419 1420 /* 1421 * free the bw_meter entries 1422 */ 1423 while (mfc->mfc_bw_meter != NULL) { 1424 struct bw_meter *x = mfc->mfc_bw_meter; 1425 1426 mfc->mfc_bw_meter = x->bm_mfc_next; 1427 kfree(x, M_BWMETER); 1428 } 1429 1430 *nptr = mfc->mfc_next; 1431 kfree(mfc, M_MRTABLE); 1432 } else { 1433 nptr = &mfc->mfc_next; 1434 } 1435 } 1436 } 1437 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, NULL); 1438 lwkt_reltoken(&mroute_token); 1439 } 1440 1441 /* 1442 * Packet forwarding routine once entry in the cache is made 1443 */ 1444 static int 1445 ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif) 1446 { 1447 struct ip *ip = mtod(m, struct ip *); 1448 vifi_t vifi; 1449 int plen = ntohs(ip->ip_len); 1450 1451 /* 1452 * Macro to send packet on vif. Since RSVP packets don't get counted on 1453 * input, they shouldn't get counted on output, so statistics keeping is 1454 * separate. 1455 */ 1456 #define MC_SEND(ip,vifp,m) { \ 1457 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1458 encap_send((ip), (vifp), (m)); \ 1459 else \ 1460 phyint_send((ip), (vifp), (m)); \ 1461 } 1462 1463 /* 1464 * If xmt_vif is not -1, send on only the requested vif. 1465 * 1466 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1467 */ 1468 if (xmt_vif < numvifs) { 1469 #ifdef PIM 1470 if (viftable[xmt_vif].v_flags & VIFF_REGISTER) 1471 pim_register_send(ip, viftable + xmt_vif, m, rt); 1472 else 1473 #endif 1474 MC_SEND(ip, viftable + xmt_vif, m); 1475 return 1; 1476 } 1477 1478 /* 1479 * Don't forward if it didn't arrive from the parent vif for its origin. 1480 */ 1481 vifi = rt->mfc_parent; 1482 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1483 /* came in the wrong interface */ 1484 if (mrtdebug & DEBUG_FORWARD) 1485 log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n", 1486 (void *)ifp, vifi, (void *)viftable[vifi].v_ifp); 1487 ++mrtstat.mrts_wrong_if; 1488 ++rt->mfc_wrong_if; 1489 /* 1490 * If we are doing PIM assert processing, send a message 1491 * to the routing daemon. 1492 * 1493 * XXX: A PIM-SM router needs the WRONGVIF detection so it 1494 * can complete the SPT switch, regardless of the type 1495 * of the iif (broadcast media, GRE tunnel, etc). 1496 */ 1497 if (pim_assert && (vifi < numvifs) && viftable[vifi].v_ifp) { 1498 struct timeval now; 1499 u_long delta; 1500 1501 #ifdef PIM 1502 if (ifp == &multicast_register_if) 1503 pimstat.pims_rcv_registers_wrongiif++; 1504 #endif 1505 1506 /* Get vifi for the incoming packet */ 1507 for (vifi=0; vifi < numvifs && viftable[vifi].v_ifp != ifp; vifi++) 1508 ; 1509 if (vifi >= numvifs) 1510 return 0; /* The iif is not found: ignore the packet. */ 1511 1512 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF) 1513 return 0; /* WRONGVIF disabled: ignore the packet */ 1514 1515 GET_TIME(now); 1516 1517 TV_DELTA(rt->mfc_last_assert, now, delta); 1518 1519 if (delta > ASSERT_MSG_TIME) { 1520 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1521 struct igmpmsg *im; 1522 int hlen = ip->ip_hl << 2; 1523 struct mbuf *mm = m_copym(m, 0, hlen, M_NOWAIT); 1524 1525 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1526 mm = m_pullup(mm, hlen); 1527 if (mm == NULL) 1528 return ENOBUFS; 1529 1530 rt->mfc_last_assert = now; 1531 1532 im = mtod(mm, struct igmpmsg *); 1533 im->im_msgtype = IGMPMSG_WRONGVIF; 1534 im->im_mbz = 0; 1535 im->im_vif = vifi; 1536 1537 mrtstat.mrts_upcalls++; 1538 1539 k_igmpsrc.sin_addr = im->im_src; 1540 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1541 log(LOG_WARNING, 1542 "ip_mforward: ip_mrouter socket queue full\n"); 1543 ++mrtstat.mrts_upq_sockfull; 1544 return ENOBUFS; 1545 } 1546 } 1547 } 1548 return 0; 1549 } 1550 1551 /* If I sourced this packet, it counts as output, else it was input. */ 1552 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) { 1553 viftable[vifi].v_pkt_out++; 1554 viftable[vifi].v_bytes_out += plen; 1555 } else { 1556 viftable[vifi].v_pkt_in++; 1557 viftable[vifi].v_bytes_in += plen; 1558 } 1559 rt->mfc_pkt_cnt++; 1560 rt->mfc_byte_cnt += plen; 1561 1562 /* 1563 * For each vif, decide if a copy of the packet should be forwarded. 1564 * Forward if: 1565 * - the ttl exceeds the vif's threshold 1566 * - there are group members downstream on interface 1567 */ 1568 for (vifi = 0; vifi < numvifs; vifi++) 1569 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1570 viftable[vifi].v_pkt_out++; 1571 viftable[vifi].v_bytes_out += plen; 1572 #ifdef PIM 1573 if (viftable[vifi].v_flags & VIFF_REGISTER) 1574 pim_register_send(ip, viftable + vifi, m, rt); 1575 else 1576 #endif 1577 MC_SEND(ip, viftable+vifi, m); 1578 } 1579 1580 /* 1581 * Perform upcall-related bw measuring. 1582 */ 1583 if (rt->mfc_bw_meter != NULL) { 1584 struct bw_meter *x; 1585 struct timeval now; 1586 1587 GET_TIME(now); 1588 for (x = rt->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) 1589 bw_meter_receive_packet(x, plen, &now); 1590 } 1591 1592 return 0; 1593 } 1594 1595 /* 1596 * check if a vif number is legal/ok. This is used by ip_output. 1597 */ 1598 static int 1599 X_legal_vif_num(int vif) 1600 { 1601 return (vif >= 0 && vif < numvifs); 1602 } 1603 1604 /* 1605 * Return the local address used by this vif 1606 */ 1607 static u_long 1608 X_ip_mcast_src(int vifi) 1609 { 1610 if (vifi >= 0 && vifi < numvifs) 1611 return viftable[vifi].v_lcl_addr.s_addr; 1612 else 1613 return INADDR_ANY; 1614 } 1615 1616 static void 1617 phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1618 { 1619 struct mbuf *mb_copy; 1620 int hlen = ip->ip_hl << 2; 1621 1622 /* 1623 * Make a new reference to the packet; make sure that 1624 * the IP header is actually copied, not just referenced, 1625 * so that ip_output() only scribbles on the copy. 1626 */ 1627 mb_copy = m_copypacket(m, M_NOWAIT); 1628 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1629 mb_copy = m_pullup(mb_copy, hlen); 1630 if (mb_copy == NULL) 1631 return; 1632 1633 if (vifp->v_rate_limit == 0) 1634 tbf_send_packet(vifp, mb_copy); 1635 else 1636 tbf_control(vifp, mb_copy, 1637 mtod(mb_copy, struct ip *), ntohs(ip->ip_len)); 1638 } 1639 1640 static void 1641 encap_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1642 { 1643 struct mbuf *mb_copy; 1644 struct ip *ip_copy; 1645 int i, len = ntohs(ip->ip_len); 1646 1647 /* Take care of delayed checksums */ 1648 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1649 in_delayed_cksum(m); 1650 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1651 } 1652 1653 /* 1654 * copy the old packet & pullup its IP header into the 1655 * new mbuf so we can modify it. Try to fill the new 1656 * mbuf since if we don't the ethernet driver will. 1657 */ 1658 MGETHDR(mb_copy, M_NOWAIT, MT_HEADER); 1659 if (mb_copy == NULL) 1660 return; 1661 mb_copy->m_data += max_linkhdr; 1662 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1663 1664 if ((mb_copy->m_next = m_copypacket(m, M_NOWAIT)) == NULL) { 1665 m_freem(mb_copy); 1666 return; 1667 } 1668 i = MHLEN - M_LEADINGSPACE(mb_copy); 1669 if (i > len) 1670 i = len; 1671 mb_copy = m_pullup(mb_copy, i); 1672 if (mb_copy == NULL) 1673 return; 1674 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr); 1675 1676 /* 1677 * fill in the encapsulating IP header. 1678 */ 1679 ip_copy = mtod(mb_copy, struct ip *); 1680 *ip_copy = multicast_encap_iphdr; 1681 ip_copy->ip_id = ip_newid(); 1682 ip_copy->ip_len = htons(ntohs(ip_copy->ip_len) + len); 1683 ip_copy->ip_src = vifp->v_lcl_addr; 1684 ip_copy->ip_dst = vifp->v_rmt_addr; 1685 1686 /* 1687 * turn the encapsulated IP header back into a valid one. 1688 */ 1689 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1690 --ip->ip_ttl; 1691 ip->ip_sum = 0; 1692 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1693 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1694 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1695 1696 if (vifp->v_rate_limit == 0) 1697 tbf_send_packet(vifp, mb_copy); 1698 else 1699 tbf_control(vifp, mb_copy, ip, ntohs(ip_copy->ip_len)); 1700 } 1701 1702 /* 1703 * De-encapsulate a packet and feed it back through ip input (this 1704 * routine is called whenever IP gets a packet with proto type 1705 * ENCAP_PROTO and a local destination address). 1706 * 1707 * This is similar to mroute_encapcheck() + mroute_encap_input() in -current. 1708 */ 1709 static int 1710 X_ipip_input(struct mbuf **mp, int *offp, int proto) 1711 { 1712 struct mbuf *m = *mp; 1713 struct ip *ip = mtod(m, struct ip *); 1714 int hlen = ip->ip_hl << 2; 1715 1716 if (!have_encap_tunnel) { 1717 rip_input(mp, offp, proto); 1718 return(IPPROTO_DONE); 1719 } 1720 *mp = NULL; 1721 1722 /* 1723 * dump the packet if it's not to a multicast destination or if 1724 * we don't have an encapsulating tunnel with the source. 1725 * Note: This code assumes that the remote site IP address 1726 * uniquely identifies the tunnel (i.e., that this site has 1727 * at most one tunnel with the remote site). 1728 */ 1729 if (!IN_MULTICAST(ntohl(((struct ip *)((char *)ip+hlen))->ip_dst.s_addr))) { 1730 ++mrtstat.mrts_bad_tunnel; 1731 m_freem(m); 1732 return(IPPROTO_DONE); 1733 } 1734 if (ip->ip_src.s_addr != last_encap_src) { 1735 struct vif *vifp = viftable; 1736 struct vif *vife = vifp + numvifs; 1737 1738 last_encap_src = ip->ip_src.s_addr; 1739 last_encap_vif = NULL; 1740 for ( ; vifp < vife; ++vifp) 1741 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) { 1742 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) 1743 == VIFF_TUNNEL) 1744 last_encap_vif = vifp; 1745 break; 1746 } 1747 } 1748 if (last_encap_vif == NULL) { 1749 last_encap_src = INADDR_ANY; 1750 mrtstat.mrts_cant_tunnel++; /*XXX*/ 1751 m_freem(m); 1752 if (mrtdebug) 1753 log(LOG_DEBUG, "ip_mforward: no tunnel with %lx\n", 1754 (u_long)ntohl(ip->ip_src.s_addr)); 1755 return(IPPROTO_DONE); 1756 } 1757 1758 if (hlen > sizeof(struct ip)) 1759 ip_stripoptions(m); 1760 m->m_data += sizeof(struct ip); 1761 m->m_len -= sizeof(struct ip); 1762 m->m_pkthdr.len -= sizeof(struct ip); 1763 m->m_pkthdr.rcvif = last_encap_vif->v_ifp; 1764 1765 netisr_queue(NETISR_IP, m); 1766 return(IPPROTO_DONE); 1767 } 1768 1769 /* 1770 * Token bucket filter module 1771 */ 1772 1773 static void 1774 tbf_control(struct vif *vifp, struct mbuf *m, struct ip *ip, u_long p_len) 1775 { 1776 struct tbf *t = vifp->v_tbf; 1777 1778 if (p_len > MAX_BKT_SIZE) { /* drop if packet is too large */ 1779 mrtstat.mrts_pkt2large++; 1780 m_freem(m); 1781 return; 1782 } 1783 1784 tbf_update_tokens(vifp); 1785 1786 if (t->tbf_q_len == 0) { /* queue empty... */ 1787 if (p_len <= t->tbf_n_tok) { /* send packet if enough tokens */ 1788 t->tbf_n_tok -= p_len; 1789 tbf_send_packet(vifp, m); 1790 } else { /* no, queue packet and try later */ 1791 tbf_queue(vifp, m); 1792 callout_reset(&tbf_reprocess_q_ch, TBF_REPROCESS, 1793 tbf_reprocess_q, vifp); 1794 } 1795 } else if (t->tbf_q_len < t->tbf_max_q_len) { 1796 /* finite queue length, so queue pkts and process queue */ 1797 tbf_queue(vifp, m); 1798 tbf_process_q(vifp); 1799 } else { 1800 /* queue full, try to dq and queue and process */ 1801 if (!tbf_dq_sel(vifp, ip)) { 1802 mrtstat.mrts_q_overflow++; 1803 m_freem(m); 1804 } else { 1805 tbf_queue(vifp, m); 1806 tbf_process_q(vifp); 1807 } 1808 } 1809 } 1810 1811 /* 1812 * adds a packet to the queue at the interface 1813 */ 1814 static void 1815 tbf_queue(struct vif *vifp, struct mbuf *m) 1816 { 1817 struct tbf *t = vifp->v_tbf; 1818 1819 lwkt_gettoken(&mroute_token); 1820 1821 if (t->tbf_t == NULL) /* Queue was empty */ 1822 t->tbf_q = m; 1823 else /* Insert at tail */ 1824 t->tbf_t->m_nextpkt = m; 1825 1826 t->tbf_t = m; /* Set new tail pointer */ 1827 1828 #ifdef DIAGNOSTIC 1829 /* Make sure we didn't get fed a bogus mbuf */ 1830 if (m->m_nextpkt) 1831 panic("tbf_queue: m_nextpkt"); 1832 #endif 1833 m->m_nextpkt = NULL; 1834 1835 t->tbf_q_len++; 1836 1837 lwkt_reltoken(&mroute_token); 1838 } 1839 1840 /* 1841 * processes the queue at the interface 1842 */ 1843 static void 1844 tbf_process_q(struct vif *vifp) 1845 { 1846 struct tbf *t = vifp->v_tbf; 1847 1848 lwkt_gettoken(&mroute_token); 1849 1850 /* loop through the queue at the interface and send as many packets 1851 * as possible 1852 */ 1853 while (t->tbf_q_len > 0) { 1854 struct mbuf *m = t->tbf_q; 1855 int len = ntohs(mtod(m, struct ip *)->ip_len); 1856 1857 /* determine if the packet can be sent */ 1858 if (len > t->tbf_n_tok) /* not enough tokens, we are done */ 1859 break; 1860 /* ok, reduce no of tokens, dequeue and send the packet. */ 1861 t->tbf_n_tok -= len; 1862 1863 t->tbf_q = m->m_nextpkt; 1864 if (--t->tbf_q_len == 0) 1865 t->tbf_t = NULL; 1866 1867 m->m_nextpkt = NULL; 1868 tbf_send_packet(vifp, m); 1869 } 1870 lwkt_reltoken(&mroute_token); 1871 } 1872 1873 static void 1874 tbf_reprocess_q(void *xvifp) 1875 { 1876 struct vif *vifp = xvifp; 1877 1878 if (ip_mrouter == NULL) 1879 return; 1880 tbf_update_tokens(vifp); 1881 tbf_process_q(vifp); 1882 if (vifp->v_tbf->tbf_q_len) 1883 callout_reset(&tbf_reprocess_q_ch, TBF_REPROCESS, 1884 tbf_reprocess_q, vifp); 1885 } 1886 1887 /* function that will selectively discard a member of the queue 1888 * based on the precedence value and the priority 1889 */ 1890 static int 1891 tbf_dq_sel(struct vif *vifp, struct ip *ip) 1892 { 1893 u_int p; 1894 struct mbuf *m, *last; 1895 struct mbuf **np; 1896 struct tbf *t = vifp->v_tbf; 1897 1898 lwkt_gettoken(&mroute_token); 1899 1900 p = priority(vifp, ip); 1901 1902 np = &t->tbf_q; 1903 last = NULL; 1904 while ((m = *np) != NULL) { 1905 if (p > priority(vifp, mtod(m, struct ip *))) { 1906 *np = m->m_nextpkt; 1907 /* If we're removing the last packet, fix the tail pointer */ 1908 if (m == t->tbf_t) 1909 t->tbf_t = last; 1910 m_freem(m); 1911 /* It's impossible for the queue to be empty, but check anyways. */ 1912 if (--t->tbf_q_len == 0) 1913 t->tbf_t = NULL; 1914 mrtstat.mrts_drop_sel++; 1915 lwkt_reltoken(&mroute_token); 1916 return 1; 1917 } 1918 np = &m->m_nextpkt; 1919 last = m; 1920 } 1921 lwkt_reltoken(&mroute_token); 1922 return 0; 1923 } 1924 1925 static void 1926 tbf_send_packet(struct vif *vifp, struct mbuf *m) 1927 { 1928 lwkt_gettoken(&mroute_token); 1929 1930 if (vifp->v_flags & VIFF_TUNNEL) /* If tunnel options */ 1931 ip_output(m, NULL, &vifp->v_route, IP_FORWARDING, NULL, NULL); 1932 else { 1933 struct ip_moptions imo; 1934 int error; 1935 static struct route ro; /* XXX check this */ 1936 1937 imo.imo_multicast_ifp = vifp->v_ifp; 1938 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 1939 imo.imo_multicast_loop = 1; 1940 imo.imo_multicast_vif = -1; 1941 1942 /* 1943 * Re-entrancy should not be a problem here, because 1944 * the packets that we send out and are looped back at us 1945 * should get rejected because they appear to come from 1946 * the loopback interface, thus preventing looping. 1947 */ 1948 error = ip_output(m, NULL, &ro, IP_FORWARDING, &imo, NULL); 1949 1950 if (mrtdebug & DEBUG_XMIT) 1951 log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 1952 (int)(vifp - viftable), error); 1953 } 1954 lwkt_reltoken(&mroute_token); 1955 } 1956 1957 /* determine the current time and then 1958 * the elapsed time (between the last time and time now) 1959 * in milliseconds & update the no. of tokens in the bucket 1960 */ 1961 static void 1962 tbf_update_tokens(struct vif *vifp) 1963 { 1964 struct timeval tp; 1965 u_long tm; 1966 struct tbf *t = vifp->v_tbf; 1967 1968 lwkt_gettoken(&mroute_token); 1969 1970 GET_TIME(tp); 1971 1972 TV_DELTA(tp, t->tbf_last_pkt_t, tm); 1973 1974 /* 1975 * This formula is actually 1976 * "time in seconds" * "bytes/second". 1977 * 1978 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 1979 * 1980 * The (1000/1024) was introduced in add_vif to optimize 1981 * this divide into a shift. 1982 */ 1983 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8; 1984 t->tbf_last_pkt_t = tp; 1985 1986 if (t->tbf_n_tok > MAX_BKT_SIZE) 1987 t->tbf_n_tok = MAX_BKT_SIZE; 1988 1989 lwkt_reltoken(&mroute_token); 1990 } 1991 1992 static int 1993 priority(struct vif *vifp, struct ip *ip) 1994 { 1995 int prio = 50; /* the lowest priority -- default case */ 1996 1997 /* temporary hack; may add general packet classifier some day */ 1998 1999 /* 2000 * The UDP port space is divided up into four priority ranges: 2001 * [0, 16384) : unclassified - lowest priority 2002 * [16384, 32768) : audio - highest priority 2003 * [32768, 49152) : whiteboard - medium priority 2004 * [49152, 65536) : video - low priority 2005 * 2006 * Everything else gets lowest priority. 2007 */ 2008 if (ip->ip_p == IPPROTO_UDP) { 2009 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 2010 switch (ntohs(udp->uh_dport) & 0xc000) { 2011 case 0x4000: 2012 prio = 70; 2013 break; 2014 case 0x8000: 2015 prio = 60; 2016 break; 2017 case 0xc000: 2018 prio = 55; 2019 break; 2020 } 2021 } 2022 return prio; 2023 } 2024 2025 /* 2026 * End of token bucket filter modifications 2027 */ 2028 2029 static int 2030 X_ip_rsvp_vif(struct socket *so, struct sockopt *sopt) 2031 { 2032 int error, vifi; 2033 2034 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2035 return EOPNOTSUPP; 2036 2037 error = soopt_to_kbuf(sopt, &vifi, sizeof vifi, sizeof vifi); 2038 if (error) 2039 return error; 2040 2041 lwkt_gettoken(&mroute_token); 2042 2043 if (vifi < 0 || vifi >= numvifs) { /* Error if vif is invalid */ 2044 lwkt_reltoken(&mroute_token); 2045 return EADDRNOTAVAIL; 2046 } 2047 2048 if (sopt->sopt_name == IP_RSVP_VIF_ON) { 2049 /* Check if socket is available. */ 2050 if (viftable[vifi].v_rsvpd != NULL) { 2051 lwkt_reltoken(&mroute_token); 2052 return EADDRINUSE; 2053 } 2054 2055 viftable[vifi].v_rsvpd = so; 2056 /* This may seem silly, but we need to be sure we don't over-increment 2057 * the RSVP counter, in case something slips up. 2058 */ 2059 if (!viftable[vifi].v_rsvp_on) { 2060 viftable[vifi].v_rsvp_on = 1; 2061 rsvp_on++; 2062 } 2063 } else { /* must be VIF_OFF */ 2064 /* 2065 * XXX as an additional consistency check, one could make sure 2066 * that viftable[vifi].v_rsvpd == so, otherwise passing so as 2067 * first parameter is pretty useless. 2068 */ 2069 viftable[vifi].v_rsvpd = NULL; 2070 /* 2071 * This may seem silly, but we need to be sure we don't over-decrement 2072 * the RSVP counter, in case something slips up. 2073 */ 2074 if (viftable[vifi].v_rsvp_on) { 2075 viftable[vifi].v_rsvp_on = 0; 2076 rsvp_on--; 2077 } 2078 } 2079 lwkt_reltoken(&mroute_token); 2080 return 0; 2081 } 2082 2083 static void 2084 X_ip_rsvp_force_done(struct socket *so) 2085 { 2086 int vifi; 2087 2088 /* Don't bother if it is not the right type of socket. */ 2089 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2090 return; 2091 2092 lwkt_gettoken(&mroute_token); 2093 2094 /* The socket may be attached to more than one vif...this 2095 * is perfectly legal. 2096 */ 2097 for (vifi = 0; vifi < numvifs; vifi++) { 2098 if (viftable[vifi].v_rsvpd == so) { 2099 viftable[vifi].v_rsvpd = NULL; 2100 /* This may seem silly, but we need to be sure we don't 2101 * over-decrement the RSVP counter, in case something slips up. 2102 */ 2103 if (viftable[vifi].v_rsvp_on) { 2104 viftable[vifi].v_rsvp_on = 0; 2105 rsvp_on--; 2106 } 2107 } 2108 } 2109 2110 lwkt_reltoken(&mroute_token); 2111 } 2112 2113 static int 2114 X_rsvp_input(struct mbuf **mp, int *offp, int proto) 2115 { 2116 int vifi; 2117 struct mbuf *m = *mp; 2118 struct ip *ip = mtod(m, struct ip *); 2119 struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET }; 2120 struct ifnet *ifp; 2121 #ifdef ALTQ 2122 /* support IP_RECVIF used by rsvpd rel4.2a1 */ 2123 struct inpcb *inp; 2124 struct socket *so; 2125 struct mbuf *opts; 2126 #endif 2127 2128 *mp = NULL; 2129 2130 if (rsvpdebug) 2131 kprintf("rsvp_input: rsvp_on %d\n",rsvp_on); 2132 2133 /* Can still get packets with rsvp_on = 0 if there is a local member 2134 * of the group to which the RSVP packet is addressed. But in this 2135 * case we want to throw the packet away. 2136 */ 2137 if (!rsvp_on) { 2138 m_freem(m); 2139 return(IPPROTO_DONE); 2140 } 2141 2142 lwkt_gettoken(&mroute_token); 2143 2144 if (rsvpdebug) 2145 kprintf("rsvp_input: check vifs\n"); 2146 2147 #ifdef DIAGNOSTIC 2148 if (!(m->m_flags & M_PKTHDR)) 2149 panic("rsvp_input no hdr"); 2150 #endif 2151 2152 ifp = m->m_pkthdr.rcvif; 2153 /* Find which vif the packet arrived on. */ 2154 for (vifi = 0; vifi < numvifs; vifi++) 2155 if (viftable[vifi].v_ifp == ifp) 2156 break; 2157 2158 #ifdef ALTQ 2159 if (vifi == numvifs || (so = viftable[vifi].v_rsvpd) == NULL) { 2160 #else 2161 if (vifi == numvifs || viftable[vifi].v_rsvpd == NULL) { 2162 #endif 2163 /* 2164 * If the old-style non-vif-associated socket is set, 2165 * then use it. Otherwise, drop packet since there 2166 * is no specific socket for this vif. 2167 */ 2168 if (ip_rsvpd != NULL) { 2169 if (rsvpdebug) 2170 kprintf("rsvp_input: Sending packet up old-style socket\n"); 2171 *mp = m; 2172 rip_input(mp, offp, proto); /* xxx */ 2173 } else { 2174 if (rsvpdebug && vifi == numvifs) 2175 kprintf("rsvp_input: Can't find vif for packet.\n"); 2176 else if (rsvpdebug && viftable[vifi].v_rsvpd == NULL) 2177 kprintf("rsvp_input: No socket defined for vif %d\n",vifi); 2178 m_freem(m); 2179 } 2180 lwkt_reltoken(&mroute_token); 2181 return(IPPROTO_DONE); 2182 } 2183 rsvp_src.sin_addr = ip->ip_src; 2184 2185 if (rsvpdebug && m) 2186 kprintf("rsvp_input: m->m_len = %d, ssb_space() = %ld\n", 2187 m->m_len,ssb_space(&(viftable[vifi].v_rsvpd->so_rcv))); 2188 2189 #ifdef ALTQ 2190 opts = NULL; 2191 inp = (struct inpcb *)so->so_pcb; 2192 if (inp->inp_flags & INP_CONTROLOPTS || 2193 inp->inp_socket->so_options & SO_TIMESTAMP) { 2194 ip_savecontrol(inp, &opts, ip, m); 2195 } 2196 if (ssb_appendaddr(&so->so_rcv, 2197 (struct sockaddr *)&rsvp_src,m, opts) == 0) { 2198 m_freem(m); 2199 if (opts) 2200 m_freem(opts); 2201 soroverflow(so); 2202 if (rsvpdebug) 2203 kprintf("rsvp_input: Failed to append to socket\n"); 2204 } 2205 else { 2206 sorwakeup(so); 2207 if (rsvpdebug) 2208 kprintf("rsvp_input: send packet up\n"); 2209 } 2210 #else /* !ALTQ */ 2211 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) { 2212 if (rsvpdebug) 2213 kprintf("rsvp_input: Failed to append to socket\n"); 2214 } else { 2215 if (rsvpdebug) 2216 kprintf("rsvp_input: send packet up\n"); 2217 } 2218 #endif /* !ALTQ */ 2219 lwkt_reltoken(&mroute_token); 2220 return(IPPROTO_DONE); 2221 } 2222 2223 /* 2224 * Code for bandwidth monitors 2225 */ 2226 2227 /* 2228 * Define common interface for timeval-related methods 2229 */ 2230 #define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp) 2231 #define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp)) 2232 #define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp)) 2233 2234 static uint32_t 2235 compute_bw_meter_flags(struct bw_upcall *req) 2236 { 2237 uint32_t flags = 0; 2238 2239 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS) 2240 flags |= BW_METER_UNIT_PACKETS; 2241 if (req->bu_flags & BW_UPCALL_UNIT_BYTES) 2242 flags |= BW_METER_UNIT_BYTES; 2243 if (req->bu_flags & BW_UPCALL_GEQ) 2244 flags |= BW_METER_GEQ; 2245 if (req->bu_flags & BW_UPCALL_LEQ) 2246 flags |= BW_METER_LEQ; 2247 2248 return flags; 2249 } 2250 2251 /* 2252 * Add a bw_meter entry 2253 */ 2254 static int 2255 add_bw_upcall(struct bw_upcall *req) 2256 { 2257 struct mfc *mfc; 2258 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC, 2259 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC }; 2260 struct timeval now; 2261 struct bw_meter *x; 2262 uint32_t flags; 2263 2264 if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) 2265 return EOPNOTSUPP; 2266 2267 /* Test if the flags are valid */ 2268 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES))) 2269 return EINVAL; 2270 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))) 2271 return EINVAL; 2272 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 2273 == (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 2274 return EINVAL; 2275 2276 /* Test if the threshold time interval is valid */ 2277 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <)) 2278 return EINVAL; 2279 2280 flags = compute_bw_meter_flags(req); 2281 2282 /* 2283 * Find if we have already same bw_meter entry 2284 */ 2285 lwkt_gettoken(&mroute_token); 2286 mfc = mfc_find(req->bu_src.s_addr, req->bu_dst.s_addr); 2287 if (mfc == NULL) { 2288 lwkt_reltoken(&mroute_token); 2289 return EADDRNOTAVAIL; 2290 } 2291 for (x = mfc->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) { 2292 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 2293 &req->bu_threshold.b_time, ==)) && 2294 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 2295 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 2296 (x->bm_flags & BW_METER_USER_FLAGS) == flags) { 2297 lwkt_reltoken(&mroute_token); 2298 return 0; /* XXX Already installed */ 2299 } 2300 } 2301 lwkt_reltoken(&mroute_token); 2302 2303 /* Allocate the new bw_meter entry */ 2304 x = kmalloc(sizeof(*x), M_BWMETER, M_INTWAIT); 2305 2306 /* Set the new bw_meter entry */ 2307 x->bm_threshold.b_time = req->bu_threshold.b_time; 2308 GET_TIME(now); 2309 x->bm_start_time = now; 2310 x->bm_threshold.b_packets = req->bu_threshold.b_packets; 2311 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes; 2312 x->bm_measured.b_packets = 0; 2313 x->bm_measured.b_bytes = 0; 2314 x->bm_flags = flags; 2315 x->bm_time_next = NULL; 2316 x->bm_time_hash = BW_METER_BUCKETS; 2317 2318 /* Add the new bw_meter entry to the front of entries for this MFC */ 2319 lwkt_gettoken(&mroute_token); 2320 x->bm_mfc = mfc; 2321 x->bm_mfc_next = mfc->mfc_bw_meter; 2322 mfc->mfc_bw_meter = x; 2323 schedule_bw_meter(x, &now); 2324 lwkt_reltoken(&mroute_token); 2325 2326 return 0; 2327 } 2328 2329 static void 2330 free_bw_list(struct bw_meter *list) 2331 { 2332 while (list != NULL) { 2333 struct bw_meter *x = list; 2334 2335 list = list->bm_mfc_next; 2336 unschedule_bw_meter(x); 2337 kfree(x, M_BWMETER); 2338 } 2339 } 2340 2341 /* 2342 * Delete one or multiple bw_meter entries 2343 */ 2344 static int 2345 del_bw_upcall(struct bw_upcall *req) 2346 { 2347 struct mfc *mfc; 2348 struct bw_meter *x; 2349 2350 if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) 2351 return EOPNOTSUPP; 2352 2353 lwkt_gettoken(&mroute_token); 2354 /* Find the corresponding MFC entry */ 2355 mfc = mfc_find(req->bu_src.s_addr, req->bu_dst.s_addr); 2356 if (mfc == NULL) { 2357 lwkt_reltoken(&mroute_token); 2358 return EADDRNOTAVAIL; 2359 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) { 2360 /* 2361 * Delete all bw_meter entries for this mfc 2362 */ 2363 struct bw_meter *list; 2364 2365 list = mfc->mfc_bw_meter; 2366 mfc->mfc_bw_meter = NULL; 2367 lwkt_reltoken(&mroute_token); 2368 free_bw_list(list); 2369 return 0; 2370 } else { /* Delete a single bw_meter entry */ 2371 struct bw_meter *prev; 2372 uint32_t flags = 0; 2373 2374 flags = compute_bw_meter_flags(req); 2375 2376 /* Find the bw_meter entry to delete */ 2377 for (prev = NULL, x = mfc->mfc_bw_meter; x != NULL; 2378 prev = x, x = x->bm_mfc_next) { 2379 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 2380 &req->bu_threshold.b_time, ==)) && 2381 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 2382 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 2383 (x->bm_flags & BW_METER_USER_FLAGS) == flags) 2384 break; 2385 } 2386 if (x != NULL) { /* Delete entry from the list for this MFC */ 2387 if (prev != NULL) 2388 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/ 2389 else 2390 x->bm_mfc->mfc_bw_meter = x->bm_mfc_next;/* new head of list */ 2391 unschedule_bw_meter(x); 2392 lwkt_reltoken(&mroute_token); 2393 /* Free the bw_meter entry */ 2394 kfree(x, M_BWMETER); 2395 return 0; 2396 } else { 2397 lwkt_reltoken(&mroute_token); 2398 return EINVAL; 2399 } 2400 } 2401 /* NOTREACHED */ 2402 } 2403 2404 /* 2405 * Perform bandwidth measurement processing that may result in an upcall 2406 */ 2407 static void 2408 bw_meter_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp) 2409 { 2410 struct timeval delta; 2411 2412 lwkt_gettoken(&mroute_token); 2413 delta = *nowp; 2414 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2415 2416 if (x->bm_flags & BW_METER_GEQ) { 2417 /* 2418 * Processing for ">=" type of bw_meter entry 2419 */ 2420 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 2421 /* Reset the bw_meter entry */ 2422 x->bm_start_time = *nowp; 2423 x->bm_measured.b_packets = 0; 2424 x->bm_measured.b_bytes = 0; 2425 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2426 } 2427 2428 /* Record that a packet is received */ 2429 x->bm_measured.b_packets++; 2430 x->bm_measured.b_bytes += plen; 2431 2432 /* 2433 * Test if we should deliver an upcall 2434 */ 2435 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) { 2436 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2437 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) || 2438 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2439 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) { 2440 /* Prepare an upcall for delivery */ 2441 bw_meter_prepare_upcall(x, nowp); 2442 x->bm_flags |= BW_METER_UPCALL_DELIVERED; 2443 } 2444 } 2445 } else if (x->bm_flags & BW_METER_LEQ) { 2446 /* 2447 * Processing for "<=" type of bw_meter entry 2448 */ 2449 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 2450 /* 2451 * We are behind time with the multicast forwarding table 2452 * scanning for "<=" type of bw_meter entries, so test now 2453 * if we should deliver an upcall. 2454 */ 2455 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2456 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2457 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2458 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2459 /* Prepare an upcall for delivery */ 2460 bw_meter_prepare_upcall(x, nowp); 2461 } 2462 /* Reschedule the bw_meter entry */ 2463 unschedule_bw_meter(x); 2464 schedule_bw_meter(x, nowp); 2465 } 2466 2467 /* Record that a packet is received */ 2468 x->bm_measured.b_packets++; 2469 x->bm_measured.b_bytes += plen; 2470 2471 /* 2472 * Test if we should restart the measuring interval 2473 */ 2474 if ((x->bm_flags & BW_METER_UNIT_PACKETS && 2475 x->bm_measured.b_packets <= x->bm_threshold.b_packets) || 2476 (x->bm_flags & BW_METER_UNIT_BYTES && 2477 x->bm_measured.b_bytes <= x->bm_threshold.b_bytes)) { 2478 /* Don't restart the measuring interval */ 2479 } else { 2480 /* Do restart the measuring interval */ 2481 /* 2482 * XXX: note that we don't unschedule and schedule, because this 2483 * might be too much overhead per packet. Instead, when we process 2484 * all entries for a given timer hash bin, we check whether it is 2485 * really a timeout. If not, we reschedule at that time. 2486 */ 2487 x->bm_start_time = *nowp; 2488 x->bm_measured.b_packets = 0; 2489 x->bm_measured.b_bytes = 0; 2490 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2491 } 2492 } 2493 lwkt_reltoken(&mroute_token); 2494 } 2495 2496 /* 2497 * Prepare a bandwidth-related upcall 2498 */ 2499 static void 2500 bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp) 2501 { 2502 struct timeval delta; 2503 struct bw_upcall *u; 2504 2505 lwkt_gettoken(&mroute_token); 2506 2507 /* 2508 * Compute the measured time interval 2509 */ 2510 delta = *nowp; 2511 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2512 2513 /* 2514 * If there are too many pending upcalls, deliver them now 2515 */ 2516 if (bw_upcalls_n >= BW_UPCALLS_MAX) 2517 bw_upcalls_send(); 2518 2519 /* 2520 * Set the bw_upcall entry 2521 */ 2522 u = &bw_upcalls[bw_upcalls_n++]; 2523 u->bu_src = x->bm_mfc->mfc_origin; 2524 u->bu_dst = x->bm_mfc->mfc_mcastgrp; 2525 u->bu_threshold.b_time = x->bm_threshold.b_time; 2526 u->bu_threshold.b_packets = x->bm_threshold.b_packets; 2527 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes; 2528 u->bu_measured.b_time = delta; 2529 u->bu_measured.b_packets = x->bm_measured.b_packets; 2530 u->bu_measured.b_bytes = x->bm_measured.b_bytes; 2531 u->bu_flags = 0; 2532 if (x->bm_flags & BW_METER_UNIT_PACKETS) 2533 u->bu_flags |= BW_UPCALL_UNIT_PACKETS; 2534 if (x->bm_flags & BW_METER_UNIT_BYTES) 2535 u->bu_flags |= BW_UPCALL_UNIT_BYTES; 2536 if (x->bm_flags & BW_METER_GEQ) 2537 u->bu_flags |= BW_UPCALL_GEQ; 2538 if (x->bm_flags & BW_METER_LEQ) 2539 u->bu_flags |= BW_UPCALL_LEQ; 2540 2541 lwkt_reltoken(&mroute_token); 2542 } 2543 2544 /* 2545 * Send the pending bandwidth-related upcalls 2546 */ 2547 static void 2548 bw_upcalls_send(void) 2549 { 2550 struct mbuf *m; 2551 int len = bw_upcalls_n * sizeof(bw_upcalls[0]); 2552 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2553 static struct igmpmsg igmpmsg = { 0, /* unused1 */ 2554 0, /* unused2 */ 2555 IGMPMSG_BW_UPCALL,/* im_msgtype */ 2556 0, /* im_mbz */ 2557 0, /* im_vif */ 2558 0, /* unused3 */ 2559 { 0 }, /* im_src */ 2560 { 0 } }; /* im_dst */ 2561 2562 if (bw_upcalls_n == 0) 2563 return; /* No pending upcalls */ 2564 2565 bw_upcalls_n = 0; 2566 2567 /* 2568 * Allocate a new mbuf, initialize it with the header and 2569 * the payload for the pending calls. 2570 */ 2571 MGETHDR(m, M_NOWAIT, MT_HEADER); 2572 if (m == NULL) { 2573 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n"); 2574 return; 2575 } 2576 2577 m_copyback(m, 0, sizeof(struct igmpmsg), &igmpmsg); 2578 m_copyback(m, sizeof(struct igmpmsg), len, &bw_upcalls[0]); 2579 2580 /* 2581 * Send the upcalls 2582 * XXX do we need to set the address in k_igmpsrc ? 2583 */ 2584 mrtstat.mrts_upcalls++; 2585 if (socket_send(ip_mrouter, m, &k_igmpsrc) < 0) { 2586 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n"); 2587 ++mrtstat.mrts_upq_sockfull; 2588 } 2589 } 2590 2591 /* 2592 * Compute the timeout hash value for the bw_meter entries 2593 */ 2594 #define BW_METER_TIMEHASH(bw_meter, hash) \ 2595 do { \ 2596 struct timeval next_timeval = (bw_meter)->bm_start_time; \ 2597 \ 2598 BW_TIMEVALADD(&next_timeval, &(bw_meter)->bm_threshold.b_time); \ 2599 (hash) = next_timeval.tv_sec; \ 2600 if (next_timeval.tv_usec) \ 2601 (hash)++; /* XXX: make sure we don't timeout early */ \ 2602 (hash) %= BW_METER_BUCKETS; \ 2603 } while (0) 2604 2605 /* 2606 * Schedule a timer to process periodically bw_meter entry of type "<=" 2607 * by linking the entry in the proper hash bucket. 2608 */ 2609 static void 2610 schedule_bw_meter(struct bw_meter *x, struct timeval *nowp) 2611 { 2612 int time_hash; 2613 2614 if (!(x->bm_flags & BW_METER_LEQ)) 2615 return; /* XXX: we schedule timers only for "<=" entries */ 2616 2617 /* 2618 * Reset the bw_meter entry 2619 */ 2620 lwkt_gettoken(&mroute_token); 2621 x->bm_start_time = *nowp; 2622 x->bm_measured.b_packets = 0; 2623 x->bm_measured.b_bytes = 0; 2624 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2625 2626 /* 2627 * Compute the timeout hash value and insert the entry 2628 */ 2629 BW_METER_TIMEHASH(x, time_hash); 2630 x->bm_time_next = bw_meter_timers[time_hash]; 2631 bw_meter_timers[time_hash] = x; 2632 x->bm_time_hash = time_hash; 2633 2634 lwkt_reltoken(&mroute_token); 2635 } 2636 2637 /* 2638 * Unschedule the periodic timer that processes bw_meter entry of type "<=" 2639 * by removing the entry from the proper hash bucket. 2640 */ 2641 static void 2642 unschedule_bw_meter(struct bw_meter *x) 2643 { 2644 int time_hash; 2645 struct bw_meter *prev, *tmp; 2646 2647 if (!(x->bm_flags & BW_METER_LEQ)) 2648 return; /* XXX: we schedule timers only for "<=" entries */ 2649 2650 /* 2651 * Compute the timeout hash value and delete the entry 2652 */ 2653 time_hash = x->bm_time_hash; 2654 if (time_hash >= BW_METER_BUCKETS) 2655 return; /* Entry was not scheduled */ 2656 2657 for (prev = NULL, tmp = bw_meter_timers[time_hash]; 2658 tmp != NULL; prev = tmp, tmp = tmp->bm_time_next) 2659 if (tmp == x) 2660 break; 2661 2662 if (tmp == NULL) 2663 panic("unschedule_bw_meter: bw_meter entry not found"); 2664 2665 if (prev != NULL) 2666 prev->bm_time_next = x->bm_time_next; 2667 else 2668 bw_meter_timers[time_hash] = x->bm_time_next; 2669 2670 x->bm_time_next = NULL; 2671 x->bm_time_hash = BW_METER_BUCKETS; 2672 } 2673 2674 2675 /* 2676 * Process all "<=" type of bw_meter that should be processed now, 2677 * and for each entry prepare an upcall if necessary. Each processed 2678 * entry is rescheduled again for the (periodic) processing. 2679 * 2680 * This is run periodically (once per second normally). On each round, 2681 * all the potentially matching entries are in the hash slot that we are 2682 * looking at. 2683 */ 2684 static void 2685 bw_meter_process(void) 2686 { 2687 static uint32_t last_tv_sec; /* last time we processed this */ 2688 2689 uint32_t loops; 2690 int i; 2691 struct timeval now, process_endtime; 2692 2693 GET_TIME(now); 2694 if (last_tv_sec == now.tv_sec) 2695 return; /* nothing to do */ 2696 2697 lwkt_gettoken(&mroute_token); 2698 loops = now.tv_sec - last_tv_sec; 2699 last_tv_sec = now.tv_sec; 2700 if (loops > BW_METER_BUCKETS) 2701 loops = BW_METER_BUCKETS; 2702 2703 /* 2704 * Process all bins of bw_meter entries from the one after the last 2705 * processed to the current one. On entry, i points to the last bucket 2706 * visited, so we need to increment i at the beginning of the loop. 2707 */ 2708 for (i = (now.tv_sec - loops) % BW_METER_BUCKETS; loops > 0; loops--) { 2709 struct bw_meter *x, *tmp_list; 2710 2711 if (++i >= BW_METER_BUCKETS) 2712 i = 0; 2713 2714 /* Disconnect the list of bw_meter entries from the bin */ 2715 tmp_list = bw_meter_timers[i]; 2716 bw_meter_timers[i] = NULL; 2717 2718 /* Process the list of bw_meter entries */ 2719 while (tmp_list != NULL) { 2720 x = tmp_list; 2721 tmp_list = tmp_list->bm_time_next; 2722 2723 /* Test if the time interval is over */ 2724 process_endtime = x->bm_start_time; 2725 BW_TIMEVALADD(&process_endtime, &x->bm_threshold.b_time); 2726 if (BW_TIMEVALCMP(&process_endtime, &now, >)) { 2727 /* Not yet: reschedule, but don't reset */ 2728 int time_hash; 2729 2730 BW_METER_TIMEHASH(x, time_hash); 2731 if (time_hash == i && process_endtime.tv_sec == now.tv_sec) { 2732 /* 2733 * XXX: somehow the bin processing is a bit ahead of time. 2734 * Put the entry in the next bin. 2735 */ 2736 if (++time_hash >= BW_METER_BUCKETS) 2737 time_hash = 0; 2738 } 2739 x->bm_time_next = bw_meter_timers[time_hash]; 2740 bw_meter_timers[time_hash] = x; 2741 x->bm_time_hash = time_hash; 2742 2743 continue; 2744 } 2745 2746 /* 2747 * Test if we should deliver an upcall 2748 */ 2749 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2750 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2751 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2752 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2753 /* Prepare an upcall for delivery */ 2754 bw_meter_prepare_upcall(x, &now); 2755 } 2756 2757 /* 2758 * Reschedule for next processing 2759 */ 2760 schedule_bw_meter(x, &now); 2761 } 2762 } 2763 /* Send all upcalls that are pending delivery */ 2764 bw_upcalls_send(); 2765 lwkt_reltoken(&mroute_token); 2766 } 2767 2768 /* 2769 * A periodic function for sending all upcalls that are pending delivery 2770 */ 2771 static void 2772 expire_bw_upcalls_send(void *unused) 2773 { 2774 bw_upcalls_send(); 2775 2776 callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, 2777 expire_bw_upcalls_send, NULL); 2778 } 2779 2780 /* 2781 * A periodic function for periodic scanning of the multicast forwarding 2782 * table for processing all "<=" bw_meter entries. 2783 */ 2784 static void 2785 expire_bw_meter_process(void *unused) 2786 { 2787 if (mrt_api_config & MRT_MFC_BW_UPCALL) 2788 bw_meter_process(); 2789 2790 callout_reset(&bw_meter_ch, BW_METER_PERIOD, 2791 expire_bw_meter_process, NULL); 2792 } 2793 2794 /* 2795 * End of bandwidth monitoring code 2796 */ 2797 2798 #ifdef PIM 2799 /* 2800 * Send the packet up to the user daemon, or eventually do kernel encapsulation 2801 * 2802 */ 2803 static int 2804 pim_register_send(struct ip *ip, struct vif *vifp, 2805 struct mbuf *m, struct mfc *rt) 2806 { 2807 struct mbuf *mb_copy, *mm; 2808 2809 if (mrtdebug & DEBUG_PIM) 2810 log(LOG_DEBUG, "pim_register_send: "); 2811 2812 mb_copy = pim_register_prepare(ip, m); 2813 if (mb_copy == NULL) 2814 return ENOBUFS; 2815 2816 /* 2817 * Send all the fragments. Note that the mbuf for each fragment 2818 * is freed by the sending machinery. 2819 */ 2820 for (mm = mb_copy; mm; mm = mb_copy) { 2821 mb_copy = mm->m_nextpkt; 2822 mm->m_nextpkt = 0; 2823 mm = m_pullup(mm, sizeof(struct ip)); 2824 if (mm != NULL) { 2825 ip = mtod(mm, struct ip *); 2826 if ((mrt_api_config & MRT_MFC_RP) && 2827 (rt->mfc_rp.s_addr != INADDR_ANY)) { 2828 pim_register_send_rp(ip, vifp, mm, rt); 2829 } else { 2830 pim_register_send_upcall(ip, vifp, mm, rt); 2831 } 2832 } 2833 } 2834 2835 return 0; 2836 } 2837 2838 /* 2839 * Return a copy of the data packet that is ready for PIM Register 2840 * encapsulation. 2841 * XXX: Note that in the returned copy the IP header is a valid one. 2842 */ 2843 static struct mbuf * 2844 pim_register_prepare(struct ip *ip, struct mbuf *m) 2845 { 2846 struct mbuf *mb_copy = NULL; 2847 int mtu; 2848 2849 /* Take care of delayed checksums */ 2850 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 2851 in_delayed_cksum(m); 2852 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 2853 } 2854 2855 /* 2856 * Copy the old packet & pullup its IP header into the 2857 * new mbuf so we can modify it. 2858 */ 2859 mb_copy = m_copypacket(m, M_NOWAIT); 2860 if (mb_copy == NULL) 2861 return NULL; 2862 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2); 2863 if (mb_copy == NULL) 2864 return NULL; 2865 2866 /* take care of the TTL */ 2867 ip = mtod(mb_copy, struct ip *); 2868 --ip->ip_ttl; 2869 2870 /* Compute the MTU after the PIM Register encapsulation */ 2871 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr); 2872 2873 if (ntohs(ip->ip_len) <= mtu) { 2874 /* Turn the IP header into a valid one */ 2875 ip->ip_sum = 0; 2876 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 2877 } else { 2878 /* Fragment the packet */ 2879 if (ip_fragment(ip, &mb_copy, mtu, 0, CSUM_DELAY_IP) != 0) { 2880 m_freem(mb_copy); 2881 return NULL; 2882 } 2883 } 2884 return mb_copy; 2885 } 2886 2887 /* 2888 * Send an upcall with the data packet to the user-level process. 2889 */ 2890 static int 2891 pim_register_send_upcall(struct ip *ip, struct vif *vifp, 2892 struct mbuf *mb_copy, struct mfc *rt) 2893 { 2894 struct mbuf *mb_first; 2895 int len = ntohs(ip->ip_len); 2896 struct igmpmsg *im; 2897 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2898 2899 /* 2900 * Add a new mbuf with an upcall header 2901 */ 2902 MGETHDR(mb_first, M_NOWAIT, MT_HEADER); 2903 if (mb_first == NULL) { 2904 m_freem(mb_copy); 2905 return ENOBUFS; 2906 } 2907 mb_first->m_data += max_linkhdr; 2908 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg); 2909 mb_first->m_len = sizeof(struct igmpmsg); 2910 mb_first->m_next = mb_copy; 2911 2912 /* Send message to routing daemon */ 2913 im = mtod(mb_first, struct igmpmsg *); 2914 im->im_msgtype = IGMPMSG_WHOLEPKT; 2915 im->im_mbz = 0; 2916 im->im_vif = vifp - viftable; 2917 im->im_src = ip->ip_src; 2918 im->im_dst = ip->ip_dst; 2919 2920 k_igmpsrc.sin_addr = ip->ip_src; 2921 2922 mrtstat.mrts_upcalls++; 2923 2924 if (socket_send(ip_mrouter, mb_first, &k_igmpsrc) < 0) { 2925 if (mrtdebug & DEBUG_PIM) 2926 log(LOG_WARNING, 2927 "mcast: pim_register_send_upcall: ip_mrouter socket queue full"); 2928 ++mrtstat.mrts_upq_sockfull; 2929 return ENOBUFS; 2930 } 2931 2932 /* Keep statistics */ 2933 pimstat.pims_snd_registers_msgs++; 2934 pimstat.pims_snd_registers_bytes += len; 2935 2936 return 0; 2937 } 2938 2939 /* 2940 * Encapsulate the data packet in PIM Register message and send it to the RP. 2941 */ 2942 static int 2943 pim_register_send_rp(struct ip *ip, struct vif *vifp, 2944 struct mbuf *mb_copy, struct mfc *rt) 2945 { 2946 struct mbuf *mb_first; 2947 struct ip *ip_outer; 2948 struct pim_encap_pimhdr *pimhdr; 2949 int len = ntohs(ip->ip_len); 2950 vifi_t vifi = rt->mfc_parent; 2951 2952 if ((vifi >= numvifs) || (viftable[vifi].v_lcl_addr.s_addr == 0)) { 2953 m_freem(mb_copy); 2954 return EADDRNOTAVAIL; /* The iif vif is invalid */ 2955 } 2956 2957 /* 2958 * Add a new mbuf with the encapsulating header 2959 */ 2960 MGETHDR(mb_first, M_NOWAIT, MT_HEADER); 2961 if (mb_first == NULL) { 2962 m_freem(mb_copy); 2963 return ENOBUFS; 2964 } 2965 mb_first->m_data += max_linkhdr; 2966 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 2967 mb_first->m_next = mb_copy; 2968 2969 mb_first->m_pkthdr.len = len + mb_first->m_len; 2970 2971 /* 2972 * Fill in the encapsulating IP and PIM header 2973 */ 2974 ip_outer = mtod(mb_first, struct ip *); 2975 *ip_outer = pim_encap_iphdr; 2976 ip_outer->ip_id = ip_newid(); 2977 ip_outer->ip_len = htons(len + 2978 sizeof(pim_encap_iphdr) + 2979 sizeof(pim_encap_pimhdr)); 2980 ip_outer->ip_src = viftable[vifi].v_lcl_addr; 2981 ip_outer->ip_dst = rt->mfc_rp; 2982 /* 2983 * Copy the inner header TOS to the outer header, and take care of the 2984 * IP_DF bit. 2985 */ 2986 ip_outer->ip_tos = ip->ip_tos; 2987 if (ip->ip_off & htons(IP_DF)) 2988 ip_outer->ip_off |= htons(IP_DF); 2989 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer 2990 + sizeof(pim_encap_iphdr)); 2991 *pimhdr = pim_encap_pimhdr; 2992 /* If the iif crosses a border, set the Border-bit */ 2993 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & mrt_api_config) 2994 pimhdr->flags |= htonl(PIM_BORDER_REGISTER); 2995 2996 mb_first->m_data += sizeof(pim_encap_iphdr); 2997 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr)); 2998 mb_first->m_data -= sizeof(pim_encap_iphdr); 2999 3000 if (vifp->v_rate_limit == 0) 3001 tbf_send_packet(vifp, mb_first); 3002 else 3003 tbf_control(vifp, mb_first, ip, ntohs(ip_outer->ip_len)); 3004 3005 /* Keep statistics */ 3006 pimstat.pims_snd_registers_msgs++; 3007 pimstat.pims_snd_registers_bytes += len; 3008 3009 return 0; 3010 } 3011 3012 /* 3013 * PIM-SMv2 and PIM-DM messages processing. 3014 * Receives and verifies the PIM control messages, and passes them 3015 * up to the listening socket, using rip_input(). 3016 * The only message with special processing is the PIM_REGISTER message 3017 * (used by PIM-SM): the PIM header is stripped off, and the inner packet 3018 * is passed to if_simloop(). 3019 */ 3020 int 3021 pim_input(struct mbuf **mp, int *offp, int proto) 3022 { 3023 struct mbuf *m = *mp; 3024 struct ip *ip = mtod(m, struct ip *); 3025 struct pim *pim; 3026 int minlen; 3027 int datalen = ntohs(ip->ip_len); 3028 int ip_tos; 3029 int iphlen; 3030 3031 iphlen = *offp; 3032 *mp = NULL; 3033 3034 /* Keep statistics */ 3035 pimstat.pims_rcv_total_msgs++; 3036 pimstat.pims_rcv_total_bytes += datalen; 3037 3038 /* 3039 * Validate lengths 3040 */ 3041 if (datalen < PIM_MINLEN) { 3042 pimstat.pims_rcv_tooshort++; 3043 log(LOG_ERR, "pim_input: packet size too small %d from %lx\n", 3044 datalen, (u_long)ip->ip_src.s_addr); 3045 m_freem(m); 3046 return(IPPROTO_DONE); 3047 } 3048 3049 /* 3050 * If the packet is at least as big as a REGISTER, go agead 3051 * and grab the PIM REGISTER header size, to avoid another 3052 * possible m_pullup() later. 3053 * 3054 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8 3055 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28 3056 */ 3057 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN); 3058 /* 3059 * Get the IP and PIM headers in contiguous memory, and 3060 * possibly the PIM REGISTER header. 3061 */ 3062 if ((m->m_flags & M_EXT || m->m_len < minlen) && 3063 (m = m_pullup(m, minlen)) == NULL) { 3064 log(LOG_ERR, "pim_input: m_pullup failure\n"); 3065 return(IPPROTO_DONE); 3066 } 3067 /* m_pullup() may have given us a new mbuf so reset ip. */ 3068 ip = mtod(m, struct ip *); 3069 ip_tos = ip->ip_tos; 3070 3071 /* adjust mbuf to point to the PIM header */ 3072 m->m_data += iphlen; 3073 m->m_len -= iphlen; 3074 pim = mtod(m, struct pim *); 3075 3076 /* 3077 * Validate checksum. If PIM REGISTER, exclude the data packet. 3078 * 3079 * XXX: some older PIMv2 implementations don't make this distinction, 3080 * so for compatibility reason perform the checksum over part of the 3081 * message, and if error, then over the whole message. 3082 */ 3083 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) { 3084 /* do nothing, checksum okay */ 3085 } else if (in_cksum(m, datalen)) { 3086 pimstat.pims_rcv_badsum++; 3087 if (mrtdebug & DEBUG_PIM) 3088 log(LOG_DEBUG, "pim_input: invalid checksum"); 3089 m_freem(m); 3090 return(IPPROTO_DONE); 3091 } 3092 3093 /* PIM version check */ 3094 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) { 3095 pimstat.pims_rcv_badversion++; 3096 log(LOG_ERR, "pim_input: incorrect version %d, expecting %d\n", 3097 PIM_VT_V(pim->pim_vt), PIM_VERSION); 3098 m_freem(m); 3099 return(IPPROTO_DONE); 3100 } 3101 3102 /* restore mbuf back to the outer IP */ 3103 m->m_data -= iphlen; 3104 m->m_len += iphlen; 3105 3106 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) { 3107 /* 3108 * Since this is a REGISTER, we'll make a copy of the register 3109 * headers ip + pim + u_int32 + encap_ip, to be passed up to the 3110 * routing daemon. 3111 */ 3112 struct sockaddr_in dst = { sizeof(dst), AF_INET }; 3113 struct mbuf *mcp; 3114 struct ip *encap_ip; 3115 u_int32_t *reghdr; 3116 3117 if ((reg_vif_num >= numvifs) || (reg_vif_num == VIFI_INVALID)) { 3118 if (mrtdebug & DEBUG_PIM) 3119 log(LOG_DEBUG, 3120 "pim_input: register vif not set: %d\n", reg_vif_num); 3121 m_freem(m); 3122 return(IPPROTO_DONE); 3123 } 3124 3125 /* 3126 * Validate length 3127 */ 3128 if (datalen < PIM_REG_MINLEN) { 3129 pimstat.pims_rcv_tooshort++; 3130 pimstat.pims_rcv_badregisters++; 3131 log(LOG_ERR, 3132 "pim_input: register packet size too small %d from %lx\n", 3133 datalen, (u_long)ip->ip_src.s_addr); 3134 m_freem(m); 3135 return(IPPROTO_DONE); 3136 } 3137 3138 reghdr = (u_int32_t *)(pim + 1); 3139 encap_ip = (struct ip *)(reghdr + 1); 3140 3141 if (mrtdebug & DEBUG_PIM) { 3142 log(LOG_DEBUG, 3143 "pim_input[register], encap_ip: %lx -> %lx, encap_ip len %d\n", 3144 (u_long)ntohl(encap_ip->ip_src.s_addr), 3145 (u_long)ntohl(encap_ip->ip_dst.s_addr), 3146 ntohs(encap_ip->ip_len)); 3147 } 3148 3149 /* verify the version number of the inner packet */ 3150 if (encap_ip->ip_v != IPVERSION) { 3151 pimstat.pims_rcv_badregisters++; 3152 if (mrtdebug & DEBUG_PIM) { 3153 log(LOG_DEBUG, "pim_input: invalid IP version (%d) " 3154 "of the inner packet\n", encap_ip->ip_v); 3155 } 3156 m_freem(m); 3157 return(IPPROTO_DONE); 3158 } 3159 3160 /* verify the inner packet is destined to a mcast group */ 3161 if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) { 3162 pimstat.pims_rcv_badregisters++; 3163 if (mrtdebug & DEBUG_PIM) 3164 log(LOG_DEBUG, 3165 "pim_input: inner packet of register is not " 3166 "multicast %lx\n", 3167 (u_long)ntohl(encap_ip->ip_dst.s_addr)); 3168 m_freem(m); 3169 return(IPPROTO_DONE); 3170 } 3171 3172 /* If a NULL_REGISTER, pass it to the daemon */ 3173 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 3174 goto pim_input_to_daemon; 3175 3176 /* 3177 * Copy the TOS from the outer IP header to the inner IP header. 3178 */ 3179 if (encap_ip->ip_tos != ip_tos) { 3180 /* Outer TOS -> inner TOS */ 3181 encap_ip->ip_tos = ip_tos; 3182 /* Recompute the inner header checksum. Sigh... */ 3183 3184 /* adjust mbuf to point to the inner IP header */ 3185 m->m_data += (iphlen + PIM_MINLEN); 3186 m->m_len -= (iphlen + PIM_MINLEN); 3187 3188 encap_ip->ip_sum = 0; 3189 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2); 3190 3191 /* restore mbuf to point back to the outer IP header */ 3192 m->m_data -= (iphlen + PIM_MINLEN); 3193 m->m_len += (iphlen + PIM_MINLEN); 3194 } 3195 3196 /* 3197 * Decapsulate the inner IP packet and loopback to forward it 3198 * as a normal multicast packet. Also, make a copy of the 3199 * outer_iphdr + pimhdr + reghdr + encap_iphdr 3200 * to pass to the daemon later, so it can take the appropriate 3201 * actions (e.g., send back PIM_REGISTER_STOP). 3202 * XXX: here m->m_data points to the outer IP header. 3203 */ 3204 mcp = m_copym(m, 0, iphlen + PIM_REG_MINLEN, M_NOWAIT); 3205 if (mcp == NULL) { 3206 log(LOG_ERR, 3207 "pim_input: pim register: could not copy register head\n"); 3208 m_freem(m); 3209 return(IPPROTO_DONE); 3210 } 3211 3212 /* Keep statistics */ 3213 /* XXX: registers_bytes include only the encap. mcast pkt */ 3214 pimstat.pims_rcv_registers_msgs++; 3215 pimstat.pims_rcv_registers_bytes += ntohs(encap_ip->ip_len); 3216 3217 /* 3218 * forward the inner ip packet; point m_data at the inner ip. 3219 */ 3220 m_adj(m, iphlen + PIM_MINLEN); 3221 3222 if (mrtdebug & DEBUG_PIM) { 3223 log(LOG_DEBUG, 3224 "pim_input: forwarding decapsulated register: " 3225 "src %lx, dst %lx, vif %d\n", 3226 (u_long)ntohl(encap_ip->ip_src.s_addr), 3227 (u_long)ntohl(encap_ip->ip_dst.s_addr), 3228 reg_vif_num); 3229 } 3230 if_simloop(viftable[reg_vif_num].v_ifp, m, dst.sin_family, 0); 3231 3232 /* prepare the register head to send to the mrouting daemon */ 3233 m = mcp; 3234 } 3235 3236 pim_input_to_daemon: 3237 /* 3238 * Pass the PIM message up to the daemon; if it is a Register message, 3239 * pass the 'head' only up to the daemon. This includes the 3240 * outer IP header, PIM header, PIM-Register header and the 3241 * inner IP header. 3242 * XXX: the outer IP header pkt size of a Register is not adjust to 3243 * reflect the fact that the inner multicast data is truncated. 3244 */ 3245 *mp = m; 3246 *offp = iphlen; 3247 rip_input(mp, offp, proto); 3248 return(IPPROTO_DONE); 3249 } 3250 #endif /* PIM */ 3251 3252 static int 3253 ip_mroute_modevent(module_t mod, int type, void *unused) 3254 { 3255 switch (type) { 3256 case MOD_LOAD: 3257 lwkt_gettoken(&mroute_token); 3258 /* XXX Protect against multiple loading */ 3259 ip_mcast_src = X_ip_mcast_src; 3260 ip_mforward = X_ip_mforward; 3261 ip_mrouter_done = X_ip_mrouter_done; 3262 ip_mrouter_get = X_ip_mrouter_get; 3263 ip_mrouter_set = X_ip_mrouter_set; 3264 ip_rsvp_force_done = X_ip_rsvp_force_done; 3265 ip_rsvp_vif = X_ip_rsvp_vif; 3266 ipip_input = X_ipip_input; 3267 legal_vif_num = X_legal_vif_num; 3268 mrt_ioctl = X_mrt_ioctl; 3269 rsvp_input_p = X_rsvp_input; 3270 lwkt_reltoken(&mroute_token); 3271 break; 3272 3273 case MOD_UNLOAD: 3274 if (ip_mrouter) 3275 return EINVAL; 3276 3277 lwkt_gettoken(&mroute_token); 3278 ip_mcast_src = NULL; 3279 ip_mforward = NULL; 3280 ip_mrouter_done = NULL; 3281 ip_mrouter_get = NULL; 3282 ip_mrouter_set = NULL; 3283 ip_rsvp_force_done = NULL; 3284 ip_rsvp_vif = NULL; 3285 ipip_input = NULL; 3286 legal_vif_num = NULL; 3287 mrt_ioctl = NULL; 3288 rsvp_input_p = NULL; 3289 lwkt_reltoken(&mroute_token); 3290 break; 3291 } 3292 return 0; 3293 } 3294 3295 static moduledata_t ip_mroutemod = { 3296 "ip_mroute", 3297 ip_mroute_modevent, 3298 0 3299 }; 3300 DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 3301