1 /* $NetBSD: ip_mroute.c,v 1.89 2005/02/03 23:08:43 perry Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Stephen Deering of Stanford University. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 35 */ 36 37 /* 38 * Copyright (c) 1989 Stephen Deering 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Stephen Deering of Stanford University. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 72 */ 73 74 /* 75 * IP multicast forwarding procedures 76 * 77 * Written by David Waitzman, BBN Labs, August 1988. 78 * Modified by Steve Deering, Stanford, February 1989. 79 * Modified by Mark J. Steiglitz, Stanford, May, 1991 80 * Modified by Van Jacobson, LBL, January 1993 81 * Modified by Ajit Thyagarajan, PARC, August 1993 82 * Modified by Bill Fenner, PARC, April 1994 83 * Modified by Charles M. Hannum, NetBSD, May 1995. 84 * Modified by Ahmed Helmy, SGI, June 1996 85 * Modified by George Edmond Eddy (Rusty), ISI, February 1998 86 * Modified by Pavlin Radoslavov, USC/ISI, May 1998, August 1999, October 2000 87 * Modified by Hitoshi Asaeda, WIDE, August 2000 88 * Modified by Pavlin Radoslavov, ICSI, October 2002 89 * 90 * MROUTING Revision: 1.2 91 * and PIM-SMv2 and PIM-DM support, advanced API support, 92 * bandwidth metering and signaling 93 */ 94 95 #include <sys/cdefs.h> 96 __KERNEL_RCSID(0, "$NetBSD: ip_mroute.c,v 1.89 2005/02/03 23:08:43 perry Exp $"); 97 98 #include "opt_inet.h" 99 #include "opt_ipsec.h" 100 #include "opt_pim.h" 101 102 #ifdef PIM 103 #define _PIM_VT 1 104 #endif 105 106 #include <sys/param.h> 107 #include <sys/systm.h> 108 #include <sys/callout.h> 109 #include <sys/mbuf.h> 110 #include <sys/socket.h> 111 #include <sys/socketvar.h> 112 #include <sys/protosw.h> 113 #include <sys/errno.h> 114 #include <sys/time.h> 115 #include <sys/kernel.h> 116 #include <sys/ioctl.h> 117 #include <sys/syslog.h> 118 119 #include <net/if.h> 120 #include <net/route.h> 121 #include <net/raw_cb.h> 122 123 #include <netinet/in.h> 124 #include <netinet/in_var.h> 125 #include <netinet/in_systm.h> 126 #include <netinet/ip.h> 127 #include <netinet/ip_var.h> 128 #include <netinet/in_pcb.h> 129 #include <netinet/udp.h> 130 #include <netinet/igmp.h> 131 #include <netinet/igmp_var.h> 132 #include <netinet/ip_mroute.h> 133 #ifdef PIM 134 #include <netinet/pim.h> 135 #include <netinet/pim_var.h> 136 #endif 137 #include <netinet/ip_encap.h> 138 139 #ifdef IPSEC 140 #include <netinet6/ipsec.h> 141 #include <netkey/key.h> 142 #endif 143 144 #ifdef FAST_IPSEC 145 #include <netipsec/ipsec.h> 146 #include <netipsec/key.h> 147 #endif 148 149 #include <machine/stdarg.h> 150 151 #define IP_MULTICASTOPTS 0 152 #define M_PULLUP(m, len) \ 153 do { \ 154 if ((m) && ((m)->m_flags & M_EXT || (m)->m_len < (len))) \ 155 (m) = m_pullup((m), (len)); \ 156 } while (/*CONSTCOND*/ 0) 157 158 /* 159 * Globals. All but ip_mrouter and ip_mrtproto could be static, 160 * except for netstat or debugging purposes. 161 */ 162 struct socket *ip_mrouter = NULL; 163 int ip_mrtproto = IGMP_DVMRP; /* for netstat only */ 164 165 #define NO_RTE_FOUND 0x1 166 #define RTE_FOUND 0x2 167 168 #define MFCHASH(a, g) \ 169 ((((a).s_addr >> 20) ^ ((a).s_addr >> 10) ^ (a).s_addr ^ \ 170 ((g).s_addr >> 20) ^ ((g).s_addr >> 10) ^ (g).s_addr) & mfchash) 171 LIST_HEAD(mfchashhdr, mfc) *mfchashtbl; 172 u_long mfchash; 173 174 u_char nexpire[MFCTBLSIZ]; 175 struct vif viftable[MAXVIFS]; 176 struct mrtstat mrtstat; 177 u_int mrtdebug = 0; /* debug level */ 178 #define DEBUG_MFC 0x02 179 #define DEBUG_FORWARD 0x04 180 #define DEBUG_EXPIRE 0x08 181 #define DEBUG_XMIT 0x10 182 #define DEBUG_PIM 0x20 183 184 #define VIFI_INVALID ((vifi_t) -1) 185 186 u_int tbfdebug = 0; /* tbf debug level */ 187 #ifdef RSVP_ISI 188 u_int rsvpdebug = 0; /* rsvp debug level */ 189 extern struct socket *ip_rsvpd; 190 extern int rsvp_on; 191 #endif /* RSVP_ISI */ 192 193 /* vif attachment using sys/netinet/ip_encap.c */ 194 static void vif_input(struct mbuf *, ...); 195 static int vif_encapcheck(const struct mbuf *, int, int, void *); 196 197 static const struct protosw vif_protosw = 198 { SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR, 199 vif_input, rip_output, 0, rip_ctloutput, 200 rip_usrreq, 201 0, 0, 0, 0, 202 }; 203 204 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 205 #define UPCALL_EXPIRE 6 /* number of timeouts */ 206 207 /* 208 * Define the token bucket filter structures 209 */ 210 211 #define TBF_REPROCESS (hz / 100) /* 100x / second */ 212 213 static int get_sg_cnt(struct sioc_sg_req *); 214 static int get_vif_cnt(struct sioc_vif_req *); 215 static int ip_mrouter_init(struct socket *, struct mbuf *); 216 static int get_version(struct mbuf *); 217 static int set_assert(struct mbuf *); 218 static int get_assert(struct mbuf *); 219 static int add_vif(struct mbuf *); 220 static int del_vif(struct mbuf *); 221 static void update_mfc_params(struct mfc *, struct mfcctl2 *); 222 static void init_mfc_params(struct mfc *, struct mfcctl2 *); 223 static void expire_mfc(struct mfc *); 224 static int add_mfc(struct mbuf *); 225 #ifdef UPCALL_TIMING 226 static void collate(struct timeval *); 227 #endif 228 static int del_mfc(struct mbuf *); 229 static int set_api_config(struct mbuf *); /* chose API capabilities */ 230 static int get_api_support(struct mbuf *); 231 static int get_api_config(struct mbuf *); 232 static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *); 233 static void expire_upcalls(void *); 234 #ifdef RSVP_ISI 235 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t); 236 #else 237 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *); 238 #endif 239 static void phyint_send(struct ip *, struct vif *, struct mbuf *); 240 static void encap_send(struct ip *, struct vif *, struct mbuf *); 241 static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_int32_t); 242 static void tbf_queue(struct vif *, struct mbuf *); 243 static void tbf_process_q(struct vif *); 244 static void tbf_reprocess_q(void *); 245 static int tbf_dq_sel(struct vif *, struct ip *); 246 static void tbf_send_packet(struct vif *, struct mbuf *); 247 static void tbf_update_tokens(struct vif *); 248 static int priority(struct vif *, struct ip *); 249 250 /* 251 * Bandwidth monitoring 252 */ 253 static void free_bw_list(struct bw_meter *); 254 static int add_bw_upcall(struct mbuf *); 255 static int del_bw_upcall(struct mbuf *); 256 static void bw_meter_receive_packet(struct bw_meter *, int , struct timeval *); 257 static void bw_meter_prepare_upcall(struct bw_meter *, struct timeval *); 258 static void bw_upcalls_send(void); 259 static void schedule_bw_meter(struct bw_meter *, struct timeval *); 260 static void unschedule_bw_meter(struct bw_meter *); 261 static void bw_meter_process(void); 262 static void expire_bw_upcalls_send(void *); 263 static void expire_bw_meter_process(void *); 264 265 #ifdef PIM 266 static int pim_register_send(struct ip *, struct vif *, 267 struct mbuf *, struct mfc *); 268 static int pim_register_send_rp(struct ip *, struct vif *, 269 struct mbuf *, struct mfc *); 270 static int pim_register_send_upcall(struct ip *, struct vif *, 271 struct mbuf *, struct mfc *); 272 static struct mbuf *pim_register_prepare(struct ip *, struct mbuf *); 273 #endif 274 275 /* 276 * 'Interfaces' associated with decapsulator (so we can tell 277 * packets that went through it from ones that get reflected 278 * by a broken gateway). These interfaces are never linked into 279 * the system ifnet list & no routes point to them. I.e., packets 280 * can't be sent this way. They only exist as a placeholder for 281 * multicast source verification. 282 */ 283 #if 0 284 struct ifnet multicast_decap_if[MAXVIFS]; 285 #endif 286 287 #define ENCAP_TTL 64 288 #define ENCAP_PROTO IPPROTO_IPIP /* 4 */ 289 290 /* prototype IP hdr for encapsulated packets */ 291 struct ip multicast_encap_iphdr = { 292 #if BYTE_ORDER == LITTLE_ENDIAN 293 sizeof(struct ip) >> 2, IPVERSION, 294 #else 295 IPVERSION, sizeof(struct ip) >> 2, 296 #endif 297 0, /* tos */ 298 sizeof(struct ip), /* total length */ 299 0, /* id */ 300 0, /* frag offset */ 301 ENCAP_TTL, ENCAP_PROTO, 302 0, /* checksum */ 303 }; 304 305 /* 306 * Bandwidth meter variables and constants 307 */ 308 309 /* 310 * Pending timeouts are stored in a hash table, the key being the 311 * expiration time. Periodically, the entries are analysed and processed. 312 */ 313 #define BW_METER_BUCKETS 1024 314 static struct bw_meter *bw_meter_timers[BW_METER_BUCKETS]; 315 struct callout bw_meter_ch; 316 #define BW_METER_PERIOD (hz) /* periodical handling of bw meters */ 317 318 /* 319 * Pending upcalls are stored in a vector which is flushed when 320 * full, or periodically 321 */ 322 static struct bw_upcall bw_upcalls[BW_UPCALLS_MAX]; 323 static u_int bw_upcalls_n; /* # of pending upcalls */ 324 struct callout bw_upcalls_ch; 325 #define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */ 326 327 #ifdef PIM 328 struct pimstat pimstat; 329 330 /* 331 * Note: the PIM Register encapsulation adds the following in front of a 332 * data packet: 333 * 334 * struct pim_encap_hdr { 335 * struct ip ip; 336 * struct pim_encap_pimhdr pim; 337 * } 338 * 339 */ 340 341 struct pim_encap_pimhdr { 342 struct pim pim; 343 uint32_t flags; 344 }; 345 346 static struct ip pim_encap_iphdr = { 347 #if BYTE_ORDER == LITTLE_ENDIAN 348 sizeof(struct ip) >> 2, 349 IPVERSION, 350 #else 351 IPVERSION, 352 sizeof(struct ip) >> 2, 353 #endif 354 0, /* tos */ 355 sizeof(struct ip), /* total length */ 356 0, /* id */ 357 0, /* frag offset */ 358 ENCAP_TTL, 359 IPPROTO_PIM, 360 0, /* checksum */ 361 }; 362 363 static struct pim_encap_pimhdr pim_encap_pimhdr = { 364 { 365 PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */ 366 0, /* reserved */ 367 0, /* checksum */ 368 }, 369 0 /* flags */ 370 }; 371 372 static struct ifnet multicast_register_if; 373 static vifi_t reg_vif_num = VIFI_INVALID; 374 #endif /* PIM */ 375 376 377 /* 378 * Private variables. 379 */ 380 static vifi_t numvifs = 0; 381 382 static struct callout expire_upcalls_ch; 383 384 /* 385 * one-back cache used by vif_encapcheck to locate a tunnel's vif 386 * given a datagram's src ip address. 387 */ 388 static struct in_addr last_encap_src; 389 static struct vif *last_encap_vif; 390 391 /* 392 * whether or not special PIM assert processing is enabled. 393 */ 394 static int pim_assert; 395 /* 396 * Rate limit for assert notification messages, in usec 397 */ 398 #define ASSERT_MSG_TIME 3000000 399 400 /* 401 * Kernel multicast routing API capabilities and setup. 402 * If more API capabilities are added to the kernel, they should be 403 * recorded in `mrt_api_support'. 404 */ 405 static const u_int32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF | 406 MRT_MFC_FLAGS_BORDER_VIF | 407 MRT_MFC_RP | 408 MRT_MFC_BW_UPCALL); 409 static u_int32_t mrt_api_config = 0; 410 411 /* 412 * Find a route for a given origin IP address and Multicast group address 413 * Type of service parameter to be added in the future!!! 414 * Statistics are updated by the caller if needed 415 * (mrtstat.mrts_mfc_lookups and mrtstat.mrts_mfc_misses) 416 */ 417 static struct mfc * 418 mfc_find(struct in_addr *o, struct in_addr *g) 419 { 420 struct mfc *rt; 421 422 LIST_FOREACH(rt, &mfchashtbl[MFCHASH(*o, *g)], mfc_hash) { 423 if (in_hosteq(rt->mfc_origin, *o) && 424 in_hosteq(rt->mfc_mcastgrp, *g) && 425 (rt->mfc_stall == NULL)) 426 break; 427 } 428 429 return (rt); 430 } 431 432 /* 433 * Macros to compute elapsed time efficiently 434 * Borrowed from Van Jacobson's scheduling code 435 */ 436 #define TV_DELTA(a, b, delta) do { \ 437 int xxs; \ 438 delta = (a).tv_usec - (b).tv_usec; \ 439 xxs = (a).tv_sec - (b).tv_sec; \ 440 switch (xxs) { \ 441 case 2: \ 442 delta += 1000000; \ 443 /* fall through */ \ 444 case 1: \ 445 delta += 1000000; \ 446 /* fall through */ \ 447 case 0: \ 448 break; \ 449 default: \ 450 delta += (1000000 * xxs); \ 451 break; \ 452 } \ 453 } while (/*CONSTCOND*/ 0) 454 455 #ifdef UPCALL_TIMING 456 u_int32_t upcall_data[51]; 457 #endif /* UPCALL_TIMING */ 458 459 /* 460 * Handle MRT setsockopt commands to modify the multicast routing tables. 461 */ 462 int 463 ip_mrouter_set(struct socket *so, int optname, struct mbuf **m) 464 { 465 int error; 466 467 if (optname != MRT_INIT && so != ip_mrouter) 468 error = ENOPROTOOPT; 469 else 470 switch (optname) { 471 case MRT_INIT: 472 error = ip_mrouter_init(so, *m); 473 break; 474 case MRT_DONE: 475 error = ip_mrouter_done(); 476 break; 477 case MRT_ADD_VIF: 478 error = add_vif(*m); 479 break; 480 case MRT_DEL_VIF: 481 error = del_vif(*m); 482 break; 483 case MRT_ADD_MFC: 484 error = add_mfc(*m); 485 break; 486 case MRT_DEL_MFC: 487 error = del_mfc(*m); 488 break; 489 case MRT_ASSERT: 490 error = set_assert(*m); 491 break; 492 case MRT_API_CONFIG: 493 error = set_api_config(*m); 494 break; 495 case MRT_ADD_BW_UPCALL: 496 error = add_bw_upcall(*m); 497 break; 498 case MRT_DEL_BW_UPCALL: 499 error = del_bw_upcall(*m); 500 break; 501 default: 502 error = ENOPROTOOPT; 503 break; 504 } 505 506 if (*m) 507 m_free(*m); 508 return (error); 509 } 510 511 /* 512 * Handle MRT getsockopt commands 513 */ 514 int 515 ip_mrouter_get(struct socket *so, int optname, struct mbuf **m) 516 { 517 int error; 518 519 if (so != ip_mrouter) 520 error = ENOPROTOOPT; 521 else { 522 *m = m_get(M_WAIT, MT_SOOPTS); 523 MCLAIM(*m, so->so_mowner); 524 525 switch (optname) { 526 case MRT_VERSION: 527 error = get_version(*m); 528 break; 529 case MRT_ASSERT: 530 error = get_assert(*m); 531 break; 532 case MRT_API_SUPPORT: 533 error = get_api_support(*m); 534 break; 535 case MRT_API_CONFIG: 536 error = get_api_config(*m); 537 break; 538 default: 539 error = ENOPROTOOPT; 540 break; 541 } 542 543 if (error) 544 m_free(*m); 545 } 546 547 return (error); 548 } 549 550 /* 551 * Handle ioctl commands to obtain information from the cache 552 */ 553 int 554 mrt_ioctl(struct socket *so, u_long cmd, caddr_t data) 555 { 556 int error; 557 558 if (so != ip_mrouter) 559 error = EINVAL; 560 else 561 switch (cmd) { 562 case SIOCGETVIFCNT: 563 error = get_vif_cnt((struct sioc_vif_req *)data); 564 break; 565 case SIOCGETSGCNT: 566 error = get_sg_cnt((struct sioc_sg_req *)data); 567 break; 568 default: 569 error = EINVAL; 570 break; 571 } 572 573 return (error); 574 } 575 576 /* 577 * returns the packet, byte, rpf-failure count for the source group provided 578 */ 579 static int 580 get_sg_cnt(struct sioc_sg_req *req) 581 { 582 int s; 583 struct mfc *rt; 584 585 s = splsoftnet(); 586 rt = mfc_find(&req->src, &req->grp); 587 if (rt == NULL) { 588 splx(s); 589 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 590 return (EADDRNOTAVAIL); 591 } 592 req->pktcnt = rt->mfc_pkt_cnt; 593 req->bytecnt = rt->mfc_byte_cnt; 594 req->wrong_if = rt->mfc_wrong_if; 595 splx(s); 596 597 return (0); 598 } 599 600 /* 601 * returns the input and output packet and byte counts on the vif provided 602 */ 603 static int 604 get_vif_cnt(struct sioc_vif_req *req) 605 { 606 vifi_t vifi = req->vifi; 607 608 if (vifi >= numvifs) 609 return (EINVAL); 610 611 req->icount = viftable[vifi].v_pkt_in; 612 req->ocount = viftable[vifi].v_pkt_out; 613 req->ibytes = viftable[vifi].v_bytes_in; 614 req->obytes = viftable[vifi].v_bytes_out; 615 616 return (0); 617 } 618 619 /* 620 * Enable multicast routing 621 */ 622 static int 623 ip_mrouter_init(struct socket *so, struct mbuf *m) 624 { 625 int *v; 626 627 if (mrtdebug) 628 log(LOG_DEBUG, 629 "ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 630 so->so_type, so->so_proto->pr_protocol); 631 632 if (so->so_type != SOCK_RAW || 633 so->so_proto->pr_protocol != IPPROTO_IGMP) 634 return (EOPNOTSUPP); 635 636 if (m == NULL || m->m_len < sizeof(int)) 637 return (EINVAL); 638 639 v = mtod(m, int *); 640 if (*v != 1) 641 return (EINVAL); 642 643 if (ip_mrouter != NULL) 644 return (EADDRINUSE); 645 646 ip_mrouter = so; 647 648 mfchashtbl = 649 hashinit(MFCTBLSIZ, HASH_LIST, M_MRTABLE, M_WAITOK, &mfchash); 650 bzero((caddr_t)nexpire, sizeof(nexpire)); 651 652 pim_assert = 0; 653 654 callout_init(&expire_upcalls_ch); 655 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 656 expire_upcalls, NULL); 657 658 callout_init(&bw_upcalls_ch); 659 callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, 660 expire_bw_upcalls_send, NULL); 661 662 callout_init(&bw_meter_ch); 663 callout_reset(&bw_meter_ch, BW_METER_PERIOD, 664 expire_bw_meter_process, NULL); 665 666 if (mrtdebug) 667 log(LOG_DEBUG, "ip_mrouter_init\n"); 668 669 return (0); 670 } 671 672 /* 673 * Disable multicast routing 674 */ 675 int 676 ip_mrouter_done(void) 677 { 678 vifi_t vifi; 679 struct vif *vifp; 680 int i; 681 int s; 682 683 s = splsoftnet(); 684 685 /* Clear out all the vifs currently in use. */ 686 for (vifi = 0; vifi < numvifs; vifi++) { 687 vifp = &viftable[vifi]; 688 if (!in_nullhost(vifp->v_lcl_addr)) 689 reset_vif(vifp); 690 } 691 692 numvifs = 0; 693 pim_assert = 0; 694 mrt_api_config = 0; 695 696 callout_stop(&expire_upcalls_ch); 697 callout_stop(&bw_upcalls_ch); 698 callout_stop(&bw_meter_ch); 699 700 /* 701 * Free all multicast forwarding cache entries. 702 */ 703 for (i = 0; i < MFCTBLSIZ; i++) { 704 struct mfc *rt, *nrt; 705 706 for (rt = LIST_FIRST(&mfchashtbl[i]); rt; rt = nrt) { 707 nrt = LIST_NEXT(rt, mfc_hash); 708 709 expire_mfc(rt); 710 } 711 } 712 713 bzero((caddr_t)nexpire, sizeof(nexpire)); 714 free(mfchashtbl, M_MRTABLE); 715 mfchashtbl = NULL; 716 717 bw_upcalls_n = 0; 718 bzero(bw_meter_timers, sizeof(bw_meter_timers)); 719 720 /* Reset de-encapsulation cache. */ 721 722 ip_mrouter = NULL; 723 724 splx(s); 725 726 if (mrtdebug) 727 log(LOG_DEBUG, "ip_mrouter_done\n"); 728 729 return (0); 730 } 731 732 void 733 ip_mrouter_detach(struct ifnet *ifp) 734 { 735 int vifi, i; 736 struct vif *vifp; 737 struct mfc *rt; 738 struct rtdetq *rte; 739 740 /* XXX not sure about side effect to userland routing daemon */ 741 for (vifi = 0; vifi < numvifs; vifi++) { 742 vifp = &viftable[vifi]; 743 if (vifp->v_ifp == ifp) 744 reset_vif(vifp); 745 } 746 for (i = 0; i < MFCTBLSIZ; i++) { 747 if (nexpire[i] == 0) 748 continue; 749 LIST_FOREACH(rt, &mfchashtbl[i], mfc_hash) { 750 for (rte = rt->mfc_stall; rte; rte = rte->next) { 751 if (rte->ifp == ifp) 752 rte->ifp = NULL; 753 } 754 } 755 } 756 } 757 758 static int 759 get_version(struct mbuf *m) 760 { 761 int *v = mtod(m, int *); 762 763 *v = 0x0305; /* XXX !!!! */ 764 m->m_len = sizeof(int); 765 return (0); 766 } 767 768 /* 769 * Set PIM assert processing global 770 */ 771 static int 772 set_assert(struct mbuf *m) 773 { 774 int *i; 775 776 if (m == NULL || m->m_len < sizeof(int)) 777 return (EINVAL); 778 779 i = mtod(m, int *); 780 pim_assert = !!*i; 781 return (0); 782 } 783 784 /* 785 * Get PIM assert processing global 786 */ 787 static int 788 get_assert(struct mbuf *m) 789 { 790 int *i = mtod(m, int *); 791 792 *i = pim_assert; 793 m->m_len = sizeof(int); 794 return (0); 795 } 796 797 /* 798 * Configure API capabilities 799 */ 800 static int 801 set_api_config(struct mbuf *m) 802 { 803 int i; 804 u_int32_t *apival; 805 806 if (m == NULL || m->m_len < sizeof(u_int32_t)) 807 return (EINVAL); 808 809 apival = mtod(m, u_int32_t *); 810 811 /* 812 * We can set the API capabilities only if it is the first operation 813 * after MRT_INIT. I.e.: 814 * - there are no vifs installed 815 * - pim_assert is not enabled 816 * - the MFC table is empty 817 */ 818 if (numvifs > 0) { 819 *apival = 0; 820 return (EPERM); 821 } 822 if (pim_assert) { 823 *apival = 0; 824 return (EPERM); 825 } 826 for (i = 0; i < MFCTBLSIZ; i++) { 827 if (LIST_FIRST(&mfchashtbl[i]) != NULL) { 828 *apival = 0; 829 return (EPERM); 830 } 831 } 832 833 mrt_api_config = *apival & mrt_api_support; 834 *apival = mrt_api_config; 835 836 return (0); 837 } 838 839 /* 840 * Get API capabilities 841 */ 842 static int 843 get_api_support(struct mbuf *m) 844 { 845 u_int32_t *apival; 846 847 if (m == NULL || m->m_len < sizeof(u_int32_t)) 848 return (EINVAL); 849 850 apival = mtod(m, u_int32_t *); 851 852 *apival = mrt_api_support; 853 854 return (0); 855 } 856 857 /* 858 * Get API configured capabilities 859 */ 860 static int 861 get_api_config(struct mbuf *m) 862 { 863 u_int32_t *apival; 864 865 if (m == NULL || m->m_len < sizeof(u_int32_t)) 866 return (EINVAL); 867 868 apival = mtod(m, u_int32_t *); 869 870 *apival = mrt_api_config; 871 872 return (0); 873 } 874 875 static struct sockaddr_in sin = { sizeof(sin), AF_INET }; 876 877 /* 878 * Add a vif to the vif table 879 */ 880 static int 881 add_vif(struct mbuf *m) 882 { 883 struct vifctl *vifcp; 884 struct vif *vifp; 885 struct ifaddr *ifa; 886 struct ifnet *ifp; 887 struct ifreq ifr; 888 int error, s; 889 890 if (m == NULL || m->m_len < sizeof(struct vifctl)) 891 return (EINVAL); 892 893 vifcp = mtod(m, struct vifctl *); 894 if (vifcp->vifc_vifi >= MAXVIFS) 895 return (EINVAL); 896 if (in_nullhost(vifcp->vifc_lcl_addr)) 897 return (EADDRNOTAVAIL); 898 899 vifp = &viftable[vifcp->vifc_vifi]; 900 if (!in_nullhost(vifp->v_lcl_addr)) 901 return (EADDRINUSE); 902 903 /* Find the interface with an address in AF_INET family. */ 904 #ifdef PIM 905 if (vifcp->vifc_flags & VIFF_REGISTER) { 906 /* 907 * XXX: Because VIFF_REGISTER does not really need a valid 908 * local interface (e.g. it could be 127.0.0.2), we don't 909 * check its address. 910 */ 911 ifp = NULL; 912 } else 913 #endif 914 { 915 sin.sin_addr = vifcp->vifc_lcl_addr; 916 ifa = ifa_ifwithaddr(sintosa(&sin)); 917 if (ifa == NULL) 918 return (EADDRNOTAVAIL); 919 ifp = ifa->ifa_ifp; 920 } 921 922 if (vifcp->vifc_flags & VIFF_TUNNEL) { 923 if (vifcp->vifc_flags & VIFF_SRCRT) { 924 log(LOG_ERR, "source routed tunnels not supported\n"); 925 return (EOPNOTSUPP); 926 } 927 928 /* attach this vif to decapsulator dispatch table */ 929 vifp->v_encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV4, 930 vif_encapcheck, &vif_protosw, vifp); 931 if (!vifp->v_encap_cookie) 932 return (EINVAL); 933 934 /* Create a fake encapsulation interface. */ 935 ifp = (struct ifnet *)malloc(sizeof(*ifp), M_MRTABLE, M_WAITOK); 936 bzero(ifp, sizeof(*ifp)); 937 snprintf(ifp->if_xname, sizeof(ifp->if_xname), 938 "mdecap%d", vifcp->vifc_vifi); 939 940 /* Prepare cached route entry. */ 941 bzero(&vifp->v_route, sizeof(vifp->v_route)); 942 #ifdef PIM 943 } else if (vifcp->vifc_flags & VIFF_REGISTER) { 944 ifp = &multicast_register_if; 945 if (mrtdebug) 946 log(LOG_DEBUG, "Adding a register vif, ifp: %p\n", 947 (void *)ifp); 948 if (reg_vif_num == VIFI_INVALID) { 949 bzero(ifp, sizeof(*ifp)); 950 snprintf(ifp->if_xname, sizeof(ifp->if_xname), 951 "register_vif"); 952 ifp->if_flags = IFF_LOOPBACK; 953 bzero(&vifp->v_route, sizeof(vifp->v_route)); 954 reg_vif_num = vifcp->vifc_vifi; 955 } 956 #endif 957 } else { 958 /* Make sure the interface supports multicast. */ 959 if ((ifp->if_flags & IFF_MULTICAST) == 0) 960 return (EOPNOTSUPP); 961 962 /* Enable promiscuous reception of all IP multicasts. */ 963 satosin(&ifr.ifr_addr)->sin_len = sizeof(struct sockaddr_in); 964 satosin(&ifr.ifr_addr)->sin_family = AF_INET; 965 satosin(&ifr.ifr_addr)->sin_addr = zeroin_addr; 966 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 967 if (error) 968 return (error); 969 } 970 971 s = splsoftnet(); 972 973 /* Define parameters for the tbf structure. */ 974 vifp->tbf_q = NULL; 975 vifp->tbf_t = &vifp->tbf_q; 976 microtime(&vifp->tbf_last_pkt_t); 977 vifp->tbf_n_tok = 0; 978 vifp->tbf_q_len = 0; 979 vifp->tbf_max_q_len = MAXQSIZE; 980 981 vifp->v_flags = vifcp->vifc_flags; 982 vifp->v_threshold = vifcp->vifc_threshold; 983 /* scaling up here allows division by 1024 in critical code */ 984 vifp->v_rate_limit = vifcp->vifc_rate_limit * 1024 / 1000; 985 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 986 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 987 vifp->v_ifp = ifp; 988 /* Initialize per vif pkt counters. */ 989 vifp->v_pkt_in = 0; 990 vifp->v_pkt_out = 0; 991 vifp->v_bytes_in = 0; 992 vifp->v_bytes_out = 0; 993 994 callout_init(&vifp->v_repq_ch); 995 996 #ifdef RSVP_ISI 997 vifp->v_rsvp_on = 0; 998 vifp->v_rsvpd = NULL; 999 #endif /* RSVP_ISI */ 1000 1001 splx(s); 1002 1003 /* Adjust numvifs up if the vifi is higher than numvifs. */ 1004 if (numvifs <= vifcp->vifc_vifi) 1005 numvifs = vifcp->vifc_vifi + 1; 1006 1007 if (mrtdebug) 1008 log(LOG_DEBUG, "add_vif #%d, lcladdr %x, %s %x, thresh %x, rate %d\n", 1009 vifcp->vifc_vifi, 1010 ntohl(vifcp->vifc_lcl_addr.s_addr), 1011 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 1012 ntohl(vifcp->vifc_rmt_addr.s_addr), 1013 vifcp->vifc_threshold, 1014 vifcp->vifc_rate_limit); 1015 1016 return (0); 1017 } 1018 1019 void 1020 reset_vif(struct vif *vifp) 1021 { 1022 struct mbuf *m, *n; 1023 struct ifnet *ifp; 1024 struct ifreq ifr; 1025 1026 callout_stop(&vifp->v_repq_ch); 1027 1028 /* detach this vif from decapsulator dispatch table */ 1029 encap_detach(vifp->v_encap_cookie); 1030 vifp->v_encap_cookie = NULL; 1031 1032 /* 1033 * Free packets queued at the interface 1034 */ 1035 for (m = vifp->tbf_q; m != NULL; m = n) { 1036 n = m->m_nextpkt; 1037 m_freem(m); 1038 } 1039 1040 if (vifp->v_flags & VIFF_TUNNEL) { 1041 free(vifp->v_ifp, M_MRTABLE); 1042 if (vifp == last_encap_vif) { 1043 last_encap_vif = NULL; 1044 last_encap_src = zeroin_addr; 1045 } 1046 } else if (vifp->v_flags & VIFF_REGISTER) { 1047 #ifdef PIM 1048 reg_vif_num = VIFI_INVALID; 1049 #endif 1050 } else { 1051 satosin(&ifr.ifr_addr)->sin_len = sizeof(struct sockaddr_in); 1052 satosin(&ifr.ifr_addr)->sin_family = AF_INET; 1053 satosin(&ifr.ifr_addr)->sin_addr = zeroin_addr; 1054 ifp = vifp->v_ifp; 1055 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 1056 } 1057 bzero((caddr_t)vifp, sizeof(*vifp)); 1058 } 1059 1060 /* 1061 * Delete a vif from the vif table 1062 */ 1063 static int 1064 del_vif(struct mbuf *m) 1065 { 1066 vifi_t *vifip; 1067 struct vif *vifp; 1068 vifi_t vifi; 1069 int s; 1070 1071 if (m == NULL || m->m_len < sizeof(vifi_t)) 1072 return (EINVAL); 1073 1074 vifip = mtod(m, vifi_t *); 1075 if (*vifip >= numvifs) 1076 return (EINVAL); 1077 1078 vifp = &viftable[*vifip]; 1079 if (in_nullhost(vifp->v_lcl_addr)) 1080 return (EADDRNOTAVAIL); 1081 1082 s = splsoftnet(); 1083 1084 reset_vif(vifp); 1085 1086 /* Adjust numvifs down */ 1087 for (vifi = numvifs; vifi > 0; vifi--) 1088 if (!in_nullhost(viftable[vifi - 1].v_lcl_addr)) 1089 break; 1090 numvifs = vifi; 1091 1092 splx(s); 1093 1094 if (mrtdebug) 1095 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", *vifip, numvifs); 1096 1097 return (0); 1098 } 1099 1100 /* 1101 * update an mfc entry without resetting counters and S,G addresses. 1102 */ 1103 static void 1104 update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 1105 { 1106 int i; 1107 1108 rt->mfc_parent = mfccp->mfcc_parent; 1109 for (i = 0; i < numvifs; i++) { 1110 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 1111 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & mrt_api_config & 1112 MRT_MFC_FLAGS_ALL; 1113 } 1114 /* set the RP address */ 1115 if (mrt_api_config & MRT_MFC_RP) 1116 rt->mfc_rp = mfccp->mfcc_rp; 1117 else 1118 rt->mfc_rp = zeroin_addr; 1119 } 1120 1121 /* 1122 * fully initialize an mfc entry from the parameter. 1123 */ 1124 static void 1125 init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 1126 { 1127 rt->mfc_origin = mfccp->mfcc_origin; 1128 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 1129 1130 update_mfc_params(rt, mfccp); 1131 1132 /* initialize pkt counters per src-grp */ 1133 rt->mfc_pkt_cnt = 0; 1134 rt->mfc_byte_cnt = 0; 1135 rt->mfc_wrong_if = 0; 1136 timerclear(&rt->mfc_last_assert); 1137 } 1138 1139 static void 1140 expire_mfc(struct mfc *rt) 1141 { 1142 struct rtdetq *rte, *nrte; 1143 1144 free_bw_list(rt->mfc_bw_meter); 1145 1146 for (rte = rt->mfc_stall; rte != NULL; rte = nrte) { 1147 nrte = rte->next; 1148 m_freem(rte->m); 1149 free(rte, M_MRTABLE); 1150 } 1151 1152 LIST_REMOVE(rt, mfc_hash); 1153 free(rt, M_MRTABLE); 1154 } 1155 1156 /* 1157 * Add an mfc entry 1158 */ 1159 static int 1160 add_mfc(struct mbuf *m) 1161 { 1162 struct mfcctl2 mfcctl2; 1163 struct mfcctl2 *mfccp; 1164 struct mfc *rt; 1165 u_int32_t hash = 0; 1166 struct rtdetq *rte, *nrte; 1167 u_short nstl; 1168 int s; 1169 int mfcctl_size = sizeof(struct mfcctl); 1170 1171 if (mrt_api_config & MRT_API_FLAGS_ALL) 1172 mfcctl_size = sizeof(struct mfcctl2); 1173 1174 if (m == NULL || m->m_len < mfcctl_size) 1175 return (EINVAL); 1176 1177 /* 1178 * select data size depending on API version. 1179 */ 1180 if (mrt_api_config & MRT_API_FLAGS_ALL) { 1181 struct mfcctl2 *mp2 = mtod(m, struct mfcctl2 *); 1182 bcopy(mp2, (caddr_t)&mfcctl2, sizeof(*mp2)); 1183 } else { 1184 struct mfcctl *mp = mtod(m, struct mfcctl *); 1185 bcopy(mp, (caddr_t)&mfcctl2, sizeof(*mp)); 1186 bzero((caddr_t)&mfcctl2 + sizeof(struct mfcctl), 1187 sizeof(mfcctl2) - sizeof(struct mfcctl)); 1188 } 1189 mfccp = &mfcctl2; 1190 1191 s = splsoftnet(); 1192 rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp); 1193 1194 /* If an entry already exists, just update the fields */ 1195 if (rt) { 1196 if (mrtdebug & DEBUG_MFC) 1197 log(LOG_DEBUG, "add_mfc update o %x g %x p %x\n", 1198 ntohl(mfccp->mfcc_origin.s_addr), 1199 ntohl(mfccp->mfcc_mcastgrp.s_addr), 1200 mfccp->mfcc_parent); 1201 1202 update_mfc_params(rt, mfccp); 1203 1204 splx(s); 1205 return (0); 1206 } 1207 1208 /* 1209 * Find the entry for which the upcall was made and update 1210 */ 1211 nstl = 0; 1212 hash = MFCHASH(mfccp->mfcc_origin, mfccp->mfcc_mcastgrp); 1213 LIST_FOREACH(rt, &mfchashtbl[hash], mfc_hash) { 1214 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) && 1215 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp) && 1216 rt->mfc_stall != NULL) { 1217 if (nstl++) 1218 log(LOG_ERR, "add_mfc %s o %x g %x p %x dbx %p\n", 1219 "multiple kernel entries", 1220 ntohl(mfccp->mfcc_origin.s_addr), 1221 ntohl(mfccp->mfcc_mcastgrp.s_addr), 1222 mfccp->mfcc_parent, rt->mfc_stall); 1223 1224 if (mrtdebug & DEBUG_MFC) 1225 log(LOG_DEBUG, "add_mfc o %x g %x p %x dbg %p\n", 1226 ntohl(mfccp->mfcc_origin.s_addr), 1227 ntohl(mfccp->mfcc_mcastgrp.s_addr), 1228 mfccp->mfcc_parent, rt->mfc_stall); 1229 1230 rte = rt->mfc_stall; 1231 init_mfc_params(rt, mfccp); 1232 rt->mfc_stall = NULL; 1233 1234 rt->mfc_expire = 0; /* Don't clean this guy up */ 1235 nexpire[hash]--; 1236 1237 /* free packets Qed at the end of this entry */ 1238 for (; rte != NULL; rte = nrte) { 1239 nrte = rte->next; 1240 if (rte->ifp) { 1241 #ifdef RSVP_ISI 1242 ip_mdq(rte->m, rte->ifp, rt, -1); 1243 #else 1244 ip_mdq(rte->m, rte->ifp, rt); 1245 #endif /* RSVP_ISI */ 1246 } 1247 m_freem(rte->m); 1248 #ifdef UPCALL_TIMING 1249 collate(&rte->t); 1250 #endif /* UPCALL_TIMING */ 1251 free(rte, M_MRTABLE); 1252 } 1253 } 1254 } 1255 1256 /* 1257 * It is possible that an entry is being inserted without an upcall 1258 */ 1259 if (nstl == 0) { 1260 /* 1261 * No mfc; make a new one 1262 */ 1263 if (mrtdebug & DEBUG_MFC) 1264 log(LOG_DEBUG, "add_mfc no upcall o %x g %x p %x\n", 1265 ntohl(mfccp->mfcc_origin.s_addr), 1266 ntohl(mfccp->mfcc_mcastgrp.s_addr), 1267 mfccp->mfcc_parent); 1268 1269 LIST_FOREACH(rt, &mfchashtbl[hash], mfc_hash) { 1270 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) && 1271 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp)) { 1272 init_mfc_params(rt, mfccp); 1273 if (rt->mfc_expire) 1274 nexpire[hash]--; 1275 rt->mfc_expire = 0; 1276 break; /* XXX */ 1277 } 1278 } 1279 if (rt == NULL) { /* no upcall, so make a new entry */ 1280 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, 1281 M_NOWAIT); 1282 if (rt == NULL) { 1283 splx(s); 1284 return (ENOBUFS); 1285 } 1286 1287 init_mfc_params(rt, mfccp); 1288 rt->mfc_expire = 0; 1289 rt->mfc_stall = NULL; 1290 rt->mfc_bw_meter = NULL; 1291 1292 /* insert new entry at head of hash chain */ 1293 LIST_INSERT_HEAD(&mfchashtbl[hash], rt, mfc_hash); 1294 } 1295 } 1296 1297 splx(s); 1298 return (0); 1299 } 1300 1301 #ifdef UPCALL_TIMING 1302 /* 1303 * collect delay statistics on the upcalls 1304 */ 1305 static void 1306 collate(struct timeval *t) 1307 { 1308 u_int32_t d; 1309 struct timeval tp; 1310 u_int32_t delta; 1311 1312 microtime(&tp); 1313 1314 if (timercmp(t, &tp, <)) { 1315 TV_DELTA(tp, *t, delta); 1316 1317 d = delta >> 10; 1318 if (d > 50) 1319 d = 50; 1320 1321 ++upcall_data[d]; 1322 } 1323 } 1324 #endif /* UPCALL_TIMING */ 1325 1326 /* 1327 * Delete an mfc entry 1328 */ 1329 static int 1330 del_mfc(struct mbuf *m) 1331 { 1332 struct mfcctl2 mfcctl2; 1333 struct mfcctl2 *mfccp; 1334 struct mfc *rt; 1335 int s; 1336 int mfcctl_size = sizeof(struct mfcctl); 1337 struct mfcctl *mp = mtod(m, struct mfcctl *); 1338 1339 /* 1340 * XXX: for deleting MFC entries the information in entries 1341 * of size "struct mfcctl" is sufficient. 1342 */ 1343 1344 if (m == NULL || m->m_len < mfcctl_size) 1345 return (EINVAL); 1346 1347 bcopy(mp, (caddr_t)&mfcctl2, sizeof(*mp)); 1348 bzero((caddr_t)&mfcctl2 + sizeof(struct mfcctl), 1349 sizeof(mfcctl2) - sizeof(struct mfcctl)); 1350 1351 mfccp = &mfcctl2; 1352 1353 if (mrtdebug & DEBUG_MFC) 1354 log(LOG_DEBUG, "del_mfc origin %x mcastgrp %x\n", 1355 ntohl(mfccp->mfcc_origin.s_addr), 1356 ntohl(mfccp->mfcc_mcastgrp.s_addr)); 1357 1358 s = splsoftnet(); 1359 1360 rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp); 1361 if (rt == NULL) { 1362 splx(s); 1363 return (EADDRNOTAVAIL); 1364 } 1365 1366 /* 1367 * free the bw_meter entries 1368 */ 1369 free_bw_list(rt->mfc_bw_meter); 1370 rt->mfc_bw_meter = NULL; 1371 1372 LIST_REMOVE(rt, mfc_hash); 1373 free(rt, M_MRTABLE); 1374 1375 splx(s); 1376 return (0); 1377 } 1378 1379 static int 1380 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src) 1381 { 1382 if (s) { 1383 if (sbappendaddr(&s->so_rcv, sintosa(src), mm, 1384 (struct mbuf *)NULL) != 0) { 1385 sorwakeup(s); 1386 return (0); 1387 } 1388 } 1389 m_freem(mm); 1390 return (-1); 1391 } 1392 1393 /* 1394 * IP multicast forwarding function. This function assumes that the packet 1395 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1396 * pointed to by "ifp", and the packet is to be relayed to other networks 1397 * that have members of the packet's destination IP multicast group. 1398 * 1399 * The packet is returned unscathed to the caller, unless it is 1400 * erroneous, in which case a non-zero return value tells the caller to 1401 * discard it. 1402 */ 1403 1404 #define IP_HDR_LEN 20 /* # bytes of fixed IP header (excluding options) */ 1405 #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1406 1407 int 1408 #ifdef RSVP_ISI 1409 ip_mforward(struct mbuf *m, struct ifnet *ifp, struct ip_moptions *imo) 1410 #else 1411 ip_mforward(struct mbuf *m, struct ifnet *ifp) 1412 #endif /* RSVP_ISI */ 1413 { 1414 struct ip *ip = mtod(m, struct ip *); 1415 struct mfc *rt; 1416 static int srctun = 0; 1417 struct mbuf *mm; 1418 int s; 1419 vifi_t vifi; 1420 1421 if (mrtdebug & DEBUG_FORWARD) 1422 log(LOG_DEBUG, "ip_mforward: src %x, dst %x, ifp %p\n", 1423 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), ifp); 1424 1425 if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 || 1426 ((u_char *)(ip + 1))[1] != IPOPT_LSRR) { 1427 /* 1428 * Packet arrived via a physical interface or 1429 * an encapsulated tunnel or a register_vif. 1430 */ 1431 } else { 1432 /* 1433 * Packet arrived through a source-route tunnel. 1434 * Source-route tunnels are no longer supported. 1435 */ 1436 if ((srctun++ % 1000) == 0) 1437 log(LOG_ERR, 1438 "ip_mforward: received source-routed packet from %x\n", 1439 ntohl(ip->ip_src.s_addr)); 1440 1441 return (1); 1442 } 1443 1444 #ifdef RSVP_ISI 1445 if (imo && ((vifi = imo->imo_multicast_vif) < numvifs)) { 1446 if (ip->ip_ttl < 255) 1447 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1448 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1449 struct vif *vifp = viftable + vifi; 1450 printf("Sending IPPROTO_RSVP from %x to %x on vif %d (%s%s)\n", 1451 ntohl(ip->ip_src), ntohl(ip->ip_dst), vifi, 1452 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1453 vifp->v_ifp->if_xname); 1454 } 1455 return (ip_mdq(m, ifp, (struct mfc *)NULL, vifi)); 1456 } 1457 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1458 printf("Warning: IPPROTO_RSVP from %x to %x without vif option\n", 1459 ntohl(ip->ip_src), ntohl(ip->ip_dst)); 1460 } 1461 #endif /* RSVP_ISI */ 1462 1463 /* 1464 * Don't forward a packet with time-to-live of zero or one, 1465 * or a packet destined to a local-only group. 1466 */ 1467 if (ip->ip_ttl <= 1 || IN_LOCAL_GROUP(ip->ip_dst.s_addr)) 1468 return (0); 1469 1470 /* 1471 * Determine forwarding vifs from the forwarding cache table 1472 */ 1473 s = splsoftnet(); 1474 ++mrtstat.mrts_mfc_lookups; 1475 rt = mfc_find(&ip->ip_src, &ip->ip_dst); 1476 1477 /* Entry exists, so forward if necessary */ 1478 if (rt != NULL) { 1479 splx(s); 1480 #ifdef RSVP_ISI 1481 return (ip_mdq(m, ifp, rt, -1)); 1482 #else 1483 return (ip_mdq(m, ifp, rt)); 1484 #endif /* RSVP_ISI */ 1485 } else { 1486 /* 1487 * If we don't have a route for packet's origin, 1488 * Make a copy of the packet & send message to routing daemon 1489 */ 1490 1491 struct mbuf *mb0; 1492 struct rtdetq *rte; 1493 u_int32_t hash; 1494 int hlen = ip->ip_hl << 2; 1495 #ifdef UPCALL_TIMING 1496 struct timeval tp; 1497 1498 microtime(&tp); 1499 #endif /* UPCALL_TIMING */ 1500 1501 ++mrtstat.mrts_mfc_misses; 1502 1503 mrtstat.mrts_no_route++; 1504 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1505 log(LOG_DEBUG, "ip_mforward: no rte s %x g %x\n", 1506 ntohl(ip->ip_src.s_addr), 1507 ntohl(ip->ip_dst.s_addr)); 1508 1509 /* 1510 * Allocate mbufs early so that we don't do extra work if we are 1511 * just going to fail anyway. Make sure to pullup the header so 1512 * that other people can't step on it. 1513 */ 1514 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, 1515 M_NOWAIT); 1516 if (rte == NULL) { 1517 splx(s); 1518 return (ENOBUFS); 1519 } 1520 mb0 = m_copy(m, 0, M_COPYALL); 1521 M_PULLUP(mb0, hlen); 1522 if (mb0 == NULL) { 1523 free(rte, M_MRTABLE); 1524 splx(s); 1525 return (ENOBUFS); 1526 } 1527 1528 /* is there an upcall waiting for this flow? */ 1529 hash = MFCHASH(ip->ip_src, ip->ip_dst); 1530 LIST_FOREACH(rt, &mfchashtbl[hash], mfc_hash) { 1531 if (in_hosteq(ip->ip_src, rt->mfc_origin) && 1532 in_hosteq(ip->ip_dst, rt->mfc_mcastgrp) && 1533 rt->mfc_stall != NULL) 1534 break; 1535 } 1536 1537 if (rt == NULL) { 1538 int i; 1539 struct igmpmsg *im; 1540 1541 /* 1542 * Locate the vifi for the incoming interface for 1543 * this packet. 1544 * If none found, drop packet. 1545 */ 1546 for (vifi = 0; vifi < numvifs && 1547 viftable[vifi].v_ifp != ifp; vifi++) 1548 ; 1549 if (vifi >= numvifs) /* vif not found, drop packet */ 1550 goto non_fatal; 1551 1552 /* no upcall, so make a new entry */ 1553 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, 1554 M_NOWAIT); 1555 if (rt == NULL) 1556 goto fail; 1557 1558 /* 1559 * Make a copy of the header to send to the user level 1560 * process 1561 */ 1562 mm = m_copy(m, 0, hlen); 1563 M_PULLUP(mm, hlen); 1564 if (mm == NULL) 1565 goto fail1; 1566 1567 /* 1568 * Send message to routing daemon to install 1569 * a route into the kernel table 1570 */ 1571 1572 im = mtod(mm, struct igmpmsg *); 1573 im->im_msgtype = IGMPMSG_NOCACHE; 1574 im->im_mbz = 0; 1575 im->im_vif = vifi; 1576 1577 mrtstat.mrts_upcalls++; 1578 1579 sin.sin_addr = ip->ip_src; 1580 if (socket_send(ip_mrouter, mm, &sin) < 0) { 1581 log(LOG_WARNING, 1582 "ip_mforward: ip_mrouter socket queue full\n"); 1583 ++mrtstat.mrts_upq_sockfull; 1584 fail1: 1585 free(rt, M_MRTABLE); 1586 fail: 1587 free(rte, M_MRTABLE); 1588 m_freem(mb0); 1589 splx(s); 1590 return (ENOBUFS); 1591 } 1592 1593 /* insert new entry at head of hash chain */ 1594 rt->mfc_origin = ip->ip_src; 1595 rt->mfc_mcastgrp = ip->ip_dst; 1596 rt->mfc_pkt_cnt = 0; 1597 rt->mfc_byte_cnt = 0; 1598 rt->mfc_wrong_if = 0; 1599 rt->mfc_expire = UPCALL_EXPIRE; 1600 nexpire[hash]++; 1601 for (i = 0; i < numvifs; i++) { 1602 rt->mfc_ttls[i] = 0; 1603 rt->mfc_flags[i] = 0; 1604 } 1605 rt->mfc_parent = -1; 1606 1607 /* clear the RP address */ 1608 rt->mfc_rp = zeroin_addr; 1609 1610 rt->mfc_bw_meter = NULL; 1611 1612 /* link into table */ 1613 LIST_INSERT_HEAD(&mfchashtbl[hash], rt, mfc_hash); 1614 /* Add this entry to the end of the queue */ 1615 rt->mfc_stall = rte; 1616 } else { 1617 /* determine if q has overflowed */ 1618 struct rtdetq **p; 1619 int npkts = 0; 1620 1621 /* 1622 * XXX ouch! we need to append to the list, but we 1623 * only have a pointer to the front, so we have to 1624 * scan the entire list every time. 1625 */ 1626 for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next) 1627 if (++npkts > MAX_UPQ) { 1628 mrtstat.mrts_upq_ovflw++; 1629 non_fatal: 1630 free(rte, M_MRTABLE); 1631 m_freem(mb0); 1632 splx(s); 1633 return (0); 1634 } 1635 1636 /* Add this entry to the end of the queue */ 1637 *p = rte; 1638 } 1639 1640 rte->next = NULL; 1641 rte->m = mb0; 1642 rte->ifp = ifp; 1643 #ifdef UPCALL_TIMING 1644 rte->t = tp; 1645 #endif /* UPCALL_TIMING */ 1646 1647 splx(s); 1648 1649 return (0); 1650 } 1651 } 1652 1653 1654 /*ARGSUSED*/ 1655 static void 1656 expire_upcalls(void *v) 1657 { 1658 int i; 1659 int s; 1660 1661 s = splsoftnet(); 1662 1663 for (i = 0; i < MFCTBLSIZ; i++) { 1664 struct mfc *rt, *nrt; 1665 1666 if (nexpire[i] == 0) 1667 continue; 1668 1669 for (rt = LIST_FIRST(&mfchashtbl[i]); rt; rt = nrt) { 1670 nrt = LIST_NEXT(rt, mfc_hash); 1671 1672 if (rt->mfc_expire == 0 || --rt->mfc_expire > 0) 1673 continue; 1674 nexpire[i]--; 1675 1676 /* 1677 * free the bw_meter entries 1678 */ 1679 while (rt->mfc_bw_meter != NULL) { 1680 struct bw_meter *x = rt->mfc_bw_meter; 1681 1682 rt->mfc_bw_meter = x->bm_mfc_next; 1683 free(x, M_BWMETER); 1684 } 1685 1686 ++mrtstat.mrts_cache_cleanups; 1687 if (mrtdebug & DEBUG_EXPIRE) 1688 log(LOG_DEBUG, 1689 "expire_upcalls: expiring (%x %x)\n", 1690 ntohl(rt->mfc_origin.s_addr), 1691 ntohl(rt->mfc_mcastgrp.s_addr)); 1692 1693 expire_mfc(rt); 1694 } 1695 } 1696 1697 splx(s); 1698 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1699 expire_upcalls, NULL); 1700 } 1701 1702 /* 1703 * Packet forwarding routine once entry in the cache is made 1704 */ 1705 static int 1706 #ifdef RSVP_ISI 1707 ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif) 1708 #else 1709 ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt) 1710 #endif /* RSVP_ISI */ 1711 { 1712 struct ip *ip = mtod(m, struct ip *); 1713 vifi_t vifi; 1714 struct vif *vifp; 1715 int plen = ntohs(ip->ip_len) - (ip->ip_hl << 2); 1716 1717 /* 1718 * Macro to send packet on vif. Since RSVP packets don't get counted on 1719 * input, they shouldn't get counted on output, so statistics keeping is 1720 * separate. 1721 */ 1722 #define MC_SEND(ip, vifp, m) do { \ 1723 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1724 encap_send((ip), (vifp), (m)); \ 1725 else \ 1726 phyint_send((ip), (vifp), (m)); \ 1727 } while (/*CONSTCOND*/ 0) 1728 1729 #ifdef RSVP_ISI 1730 /* 1731 * If xmt_vif is not -1, send on only the requested vif. 1732 * 1733 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs. 1734 */ 1735 if (xmt_vif < numvifs) { 1736 #ifdef PIM 1737 if (viftable[xmt_vif].v_flags & VIFF_REGISTER) 1738 pim_register_send(ip, viftable + xmt_vif, m, rt); 1739 else 1740 #endif 1741 MC_SEND(ip, viftable + xmt_vif, m); 1742 return (1); 1743 } 1744 #endif /* RSVP_ISI */ 1745 1746 /* 1747 * Don't forward if it didn't arrive from the parent vif for its origin. 1748 */ 1749 vifi = rt->mfc_parent; 1750 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1751 /* came in the wrong interface */ 1752 if (mrtdebug & DEBUG_FORWARD) 1753 log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n", 1754 ifp, vifi, 1755 vifi >= numvifs ? 0 : viftable[vifi].v_ifp); 1756 ++mrtstat.mrts_wrong_if; 1757 ++rt->mfc_wrong_if; 1758 /* 1759 * If we are doing PIM assert processing, send a message 1760 * to the routing daemon. 1761 * 1762 * XXX: A PIM-SM router needs the WRONGVIF detection so it 1763 * can complete the SPT switch, regardless of the type 1764 * of the iif (broadcast media, GRE tunnel, etc). 1765 */ 1766 if (pim_assert && (vifi < numvifs) && viftable[vifi].v_ifp) { 1767 struct timeval now; 1768 u_int32_t delta; 1769 1770 #ifdef PIM 1771 if (ifp == &multicast_register_if) 1772 pimstat.pims_rcv_registers_wrongiif++; 1773 #endif 1774 1775 /* Get vifi for the incoming packet */ 1776 for (vifi = 0; 1777 vifi < numvifs && viftable[vifi].v_ifp != ifp; 1778 vifi++) 1779 ; 1780 if (vifi >= numvifs) { 1781 /* The iif is not found: ignore the packet. */ 1782 return (0); 1783 } 1784 1785 if (rt->mfc_flags[vifi] & 1786 MRT_MFC_FLAGS_DISABLE_WRONGVIF) { 1787 /* WRONGVIF disabled: ignore the packet */ 1788 return (0); 1789 } 1790 1791 microtime(&now); 1792 1793 TV_DELTA(rt->mfc_last_assert, now, delta); 1794 1795 if (delta > ASSERT_MSG_TIME) { 1796 struct igmpmsg *im; 1797 int hlen = ip->ip_hl << 2; 1798 struct mbuf *mm = m_copy(m, 0, hlen); 1799 1800 M_PULLUP(mm, hlen); 1801 if (mm == NULL) 1802 return (ENOBUFS); 1803 1804 rt->mfc_last_assert = now; 1805 1806 im = mtod(mm, struct igmpmsg *); 1807 im->im_msgtype = IGMPMSG_WRONGVIF; 1808 im->im_mbz = 0; 1809 im->im_vif = vifi; 1810 1811 mrtstat.mrts_upcalls++; 1812 1813 sin.sin_addr = im->im_src; 1814 if (socket_send(ip_mrouter, mm, &sin) < 0) { 1815 log(LOG_WARNING, 1816 "ip_mforward: ip_mrouter socket queue full\n"); 1817 ++mrtstat.mrts_upq_sockfull; 1818 return (ENOBUFS); 1819 } 1820 } 1821 } 1822 return (0); 1823 } 1824 1825 /* If I sourced this packet, it counts as output, else it was input. */ 1826 if (in_hosteq(ip->ip_src, viftable[vifi].v_lcl_addr)) { 1827 viftable[vifi].v_pkt_out++; 1828 viftable[vifi].v_bytes_out += plen; 1829 } else { 1830 viftable[vifi].v_pkt_in++; 1831 viftable[vifi].v_bytes_in += plen; 1832 } 1833 rt->mfc_pkt_cnt++; 1834 rt->mfc_byte_cnt += plen; 1835 1836 /* 1837 * For each vif, decide if a copy of the packet should be forwarded. 1838 * Forward if: 1839 * - the ttl exceeds the vif's threshold 1840 * - there are group members downstream on interface 1841 */ 1842 for (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++) 1843 if ((rt->mfc_ttls[vifi] > 0) && 1844 (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1845 vifp->v_pkt_out++; 1846 vifp->v_bytes_out += plen; 1847 #ifdef PIM 1848 if (vifp->v_flags & VIFF_REGISTER) 1849 pim_register_send(ip, vifp, m, rt); 1850 else 1851 #endif 1852 MC_SEND(ip, vifp, m); 1853 } 1854 1855 /* 1856 * Perform upcall-related bw measuring. 1857 */ 1858 if (rt->mfc_bw_meter != NULL) { 1859 struct bw_meter *x; 1860 struct timeval now; 1861 1862 microtime(&now); 1863 for (x = rt->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) 1864 bw_meter_receive_packet(x, plen, &now); 1865 } 1866 1867 return (0); 1868 } 1869 1870 #ifdef RSVP_ISI 1871 /* 1872 * check if a vif number is legal/ok. This is used by ip_output. 1873 */ 1874 int 1875 legal_vif_num(int vif) 1876 { 1877 if (vif >= 0 && vif < numvifs) 1878 return (1); 1879 else 1880 return (0); 1881 } 1882 #endif /* RSVP_ISI */ 1883 1884 static void 1885 phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1886 { 1887 struct mbuf *mb_copy; 1888 int hlen = ip->ip_hl << 2; 1889 1890 /* 1891 * Make a new reference to the packet; make sure that 1892 * the IP header is actually copied, not just referenced, 1893 * so that ip_output() only scribbles on the copy. 1894 */ 1895 mb_copy = m_copy(m, 0, M_COPYALL); 1896 M_PULLUP(mb_copy, hlen); 1897 if (mb_copy == NULL) 1898 return; 1899 1900 if (vifp->v_rate_limit <= 0) 1901 tbf_send_packet(vifp, mb_copy); 1902 else 1903 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), 1904 ntohs(ip->ip_len)); 1905 } 1906 1907 static void 1908 encap_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1909 { 1910 struct mbuf *mb_copy; 1911 struct ip *ip_copy; 1912 int i, len = ntohs(ip->ip_len) + sizeof(multicast_encap_iphdr); 1913 1914 /* Take care of delayed checksums */ 1915 if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 1916 in_delayed_cksum(m); 1917 m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 1918 } 1919 1920 /* 1921 * copy the old packet & pullup it's IP header into the 1922 * new mbuf so we can modify it. Try to fill the new 1923 * mbuf since if we don't the ethernet driver will. 1924 */ 1925 MGETHDR(mb_copy, M_DONTWAIT, MT_DATA); 1926 if (mb_copy == NULL) 1927 return; 1928 mb_copy->m_data += max_linkhdr; 1929 mb_copy->m_pkthdr.len = len; 1930 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1931 1932 if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1933 m_freem(mb_copy); 1934 return; 1935 } 1936 i = MHLEN - max_linkhdr; 1937 if (i > len) 1938 i = len; 1939 mb_copy = m_pullup(mb_copy, i); 1940 if (mb_copy == NULL) 1941 return; 1942 1943 /* 1944 * fill in the encapsulating IP header. 1945 */ 1946 ip_copy = mtod(mb_copy, struct ip *); 1947 *ip_copy = multicast_encap_iphdr; 1948 ip_copy->ip_id = ip_newid(); 1949 ip_copy->ip_len = htons(len); 1950 ip_copy->ip_src = vifp->v_lcl_addr; 1951 ip_copy->ip_dst = vifp->v_rmt_addr; 1952 1953 /* 1954 * turn the encapsulated IP header back into a valid one. 1955 */ 1956 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1957 --ip->ip_ttl; 1958 ip->ip_sum = 0; 1959 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1960 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1961 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1962 1963 if (vifp->v_rate_limit <= 0) 1964 tbf_send_packet(vifp, mb_copy); 1965 else 1966 tbf_control(vifp, mb_copy, ip, ntohs(ip_copy->ip_len)); 1967 } 1968 1969 /* 1970 * De-encapsulate a packet and feed it back through ip input. 1971 */ 1972 static void 1973 vif_input(struct mbuf *m, ...) 1974 { 1975 int off, proto; 1976 va_list ap; 1977 struct vif *vifp; 1978 int s; 1979 struct ifqueue *ifq; 1980 1981 va_start(ap, m); 1982 off = va_arg(ap, int); 1983 proto = va_arg(ap, int); 1984 va_end(ap); 1985 1986 vifp = (struct vif *)encap_getarg(m); 1987 if (!vifp || proto != AF_INET) { 1988 m_freem(m); 1989 mrtstat.mrts_bad_tunnel++; 1990 return; 1991 } 1992 1993 m_adj(m, off); 1994 m->m_pkthdr.rcvif = vifp->v_ifp; 1995 ifq = &ipintrq; 1996 s = splnet(); 1997 if (IF_QFULL(ifq)) { 1998 IF_DROP(ifq); 1999 m_freem(m); 2000 } else { 2001 IF_ENQUEUE(ifq, m); 2002 /* 2003 * normally we would need a "schednetisr(NETISR_IP)" 2004 * here but we were called by ip_input and it is going 2005 * to loop back & try to dequeue the packet we just 2006 * queued as soon as we return so we avoid the 2007 * unnecessary software interrrupt. 2008 */ 2009 } 2010 splx(s); 2011 } 2012 2013 /* 2014 * Check if the packet should be grabbed by us. 2015 */ 2016 static int 2017 vif_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 2018 { 2019 struct vif *vifp; 2020 struct ip ip; 2021 2022 #ifdef DIAGNOSTIC 2023 if (!arg || proto != IPPROTO_IPV4) 2024 panic("unexpected arg in vif_encapcheck"); 2025 #endif 2026 2027 /* 2028 * do not grab the packet if it's not to a multicast destination or if 2029 * we don't have an encapsulating tunnel with the source. 2030 * Note: This code assumes that the remote site IP address 2031 * uniquely identifies the tunnel (i.e., that this site has 2032 * at most one tunnel with the remote site). 2033 */ 2034 2035 /* LINTED const cast */ 2036 m_copydata((struct mbuf *)m, off, sizeof(ip), (caddr_t)&ip); 2037 if (!IN_MULTICAST(ip.ip_dst.s_addr)) 2038 return 0; 2039 2040 /* LINTED const cast */ 2041 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 2042 if (!in_hosteq(ip.ip_src, last_encap_src)) { 2043 vifp = (struct vif *)arg; 2044 if (vifp->v_flags & VIFF_TUNNEL && 2045 in_hosteq(vifp->v_rmt_addr, ip.ip_src)) 2046 ; 2047 else 2048 return 0; 2049 last_encap_vif = vifp; 2050 last_encap_src = ip.ip_src; 2051 } else 2052 vifp = last_encap_vif; 2053 2054 /* 32bit match, since we have checked ip_src only */ 2055 return 32; 2056 } 2057 2058 /* 2059 * Token bucket filter module 2060 */ 2061 static void 2062 tbf_control(struct vif *vifp, struct mbuf *m, struct ip *ip, u_int32_t len) 2063 { 2064 2065 if (len > MAX_BKT_SIZE) { 2066 /* drop if packet is too large */ 2067 mrtstat.mrts_pkt2large++; 2068 m_freem(m); 2069 return; 2070 } 2071 2072 tbf_update_tokens(vifp); 2073 2074 /* 2075 * If there are enough tokens, and the queue is empty, send this packet 2076 * out immediately. Otherwise, try to insert it on this vif's queue. 2077 */ 2078 if (vifp->tbf_q_len == 0) { 2079 if (len <= vifp->tbf_n_tok) { 2080 vifp->tbf_n_tok -= len; 2081 tbf_send_packet(vifp, m); 2082 } else { 2083 /* queue packet and timeout till later */ 2084 tbf_queue(vifp, m); 2085 callout_reset(&vifp->v_repq_ch, TBF_REPROCESS, 2086 tbf_reprocess_q, vifp); 2087 } 2088 } else { 2089 if (vifp->tbf_q_len >= vifp->tbf_max_q_len && 2090 !tbf_dq_sel(vifp, ip)) { 2091 /* queue full, and couldn't make room */ 2092 mrtstat.mrts_q_overflow++; 2093 m_freem(m); 2094 } else { 2095 /* queue length low enough, or made room */ 2096 tbf_queue(vifp, m); 2097 tbf_process_q(vifp); 2098 } 2099 } 2100 } 2101 2102 /* 2103 * adds a packet to the queue at the interface 2104 */ 2105 static void 2106 tbf_queue(struct vif *vifp, struct mbuf *m) 2107 { 2108 int s = splsoftnet(); 2109 2110 /* insert at tail */ 2111 *vifp->tbf_t = m; 2112 vifp->tbf_t = &m->m_nextpkt; 2113 vifp->tbf_q_len++; 2114 2115 splx(s); 2116 } 2117 2118 2119 /* 2120 * processes the queue at the interface 2121 */ 2122 static void 2123 tbf_process_q(struct vif *vifp) 2124 { 2125 struct mbuf *m; 2126 int len; 2127 int s = splsoftnet(); 2128 2129 /* 2130 * Loop through the queue at the interface and send as many packets 2131 * as possible. 2132 */ 2133 for (m = vifp->tbf_q; m != NULL; m = vifp->tbf_q) { 2134 len = ntohs(mtod(m, struct ip *)->ip_len); 2135 2136 /* determine if the packet can be sent */ 2137 if (len <= vifp->tbf_n_tok) { 2138 /* if so, 2139 * reduce no of tokens, dequeue the packet, 2140 * send the packet. 2141 */ 2142 if ((vifp->tbf_q = m->m_nextpkt) == NULL) 2143 vifp->tbf_t = &vifp->tbf_q; 2144 --vifp->tbf_q_len; 2145 2146 m->m_nextpkt = NULL; 2147 vifp->tbf_n_tok -= len; 2148 tbf_send_packet(vifp, m); 2149 } else 2150 break; 2151 } 2152 splx(s); 2153 } 2154 2155 static void 2156 tbf_reprocess_q(void *arg) 2157 { 2158 struct vif *vifp = arg; 2159 2160 if (ip_mrouter == NULL) 2161 return; 2162 2163 tbf_update_tokens(vifp); 2164 tbf_process_q(vifp); 2165 2166 if (vifp->tbf_q_len != 0) 2167 callout_reset(&vifp->v_repq_ch, TBF_REPROCESS, 2168 tbf_reprocess_q, vifp); 2169 } 2170 2171 /* function that will selectively discard a member of the queue 2172 * based on the precedence value and the priority 2173 */ 2174 static int 2175 tbf_dq_sel(struct vif *vifp, struct ip *ip) 2176 { 2177 u_int p; 2178 struct mbuf **mp, *m; 2179 int s = splsoftnet(); 2180 2181 p = priority(vifp, ip); 2182 2183 for (mp = &vifp->tbf_q, m = *mp; 2184 m != NULL; 2185 mp = &m->m_nextpkt, m = *mp) { 2186 if (p > priority(vifp, mtod(m, struct ip *))) { 2187 if ((*mp = m->m_nextpkt) == NULL) 2188 vifp->tbf_t = mp; 2189 --vifp->tbf_q_len; 2190 2191 m_freem(m); 2192 mrtstat.mrts_drop_sel++; 2193 splx(s); 2194 return (1); 2195 } 2196 } 2197 splx(s); 2198 return (0); 2199 } 2200 2201 static void 2202 tbf_send_packet(struct vif *vifp, struct mbuf *m) 2203 { 2204 int error; 2205 int s = splsoftnet(); 2206 2207 if (vifp->v_flags & VIFF_TUNNEL) { 2208 /* If tunnel options */ 2209 ip_output(m, (struct mbuf *)NULL, &vifp->v_route, 2210 IP_FORWARDING, (struct ip_moptions *)NULL, 2211 (struct socket *)NULL); 2212 } else { 2213 /* if physical interface option, extract the options and then send */ 2214 struct ip_moptions imo; 2215 2216 imo.imo_multicast_ifp = vifp->v_ifp; 2217 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 2218 imo.imo_multicast_loop = 1; 2219 #ifdef RSVP_ISI 2220 imo.imo_multicast_vif = -1; 2221 #endif 2222 2223 error = ip_output(m, (struct mbuf *)NULL, (struct route *)NULL, 2224 IP_FORWARDING|IP_MULTICASTOPTS, &imo, 2225 (struct socket *)NULL); 2226 2227 if (mrtdebug & DEBUG_XMIT) 2228 log(LOG_DEBUG, "phyint_send on vif %ld err %d\n", 2229 (long)(vifp - viftable), error); 2230 } 2231 splx(s); 2232 } 2233 2234 /* determine the current time and then 2235 * the elapsed time (between the last time and time now) 2236 * in milliseconds & update the no. of tokens in the bucket 2237 */ 2238 static void 2239 tbf_update_tokens(struct vif *vifp) 2240 { 2241 struct timeval tp; 2242 u_int32_t tm; 2243 int s = splsoftnet(); 2244 2245 microtime(&tp); 2246 2247 TV_DELTA(tp, vifp->tbf_last_pkt_t, tm); 2248 2249 /* 2250 * This formula is actually 2251 * "time in seconds" * "bytes/second". 2252 * 2253 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 2254 * 2255 * The (1000/1024) was introduced in add_vif to optimize 2256 * this divide into a shift. 2257 */ 2258 vifp->tbf_n_tok += tm * vifp->v_rate_limit / 8192; 2259 vifp->tbf_last_pkt_t = tp; 2260 2261 if (vifp->tbf_n_tok > MAX_BKT_SIZE) 2262 vifp->tbf_n_tok = MAX_BKT_SIZE; 2263 2264 splx(s); 2265 } 2266 2267 static int 2268 priority(struct vif *vifp, struct ip *ip) 2269 { 2270 int prio = 50; /* the lowest priority -- default case */ 2271 2272 /* temporary hack; may add general packet classifier some day */ 2273 2274 /* 2275 * The UDP port space is divided up into four priority ranges: 2276 * [0, 16384) : unclassified - lowest priority 2277 * [16384, 32768) : audio - highest priority 2278 * [32768, 49152) : whiteboard - medium priority 2279 * [49152, 65536) : video - low priority 2280 */ 2281 if (ip->ip_p == IPPROTO_UDP) { 2282 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 2283 2284 switch (ntohs(udp->uh_dport) & 0xc000) { 2285 case 0x4000: 2286 prio = 70; 2287 break; 2288 case 0x8000: 2289 prio = 60; 2290 break; 2291 case 0xc000: 2292 prio = 55; 2293 break; 2294 } 2295 2296 if (tbfdebug > 1) 2297 log(LOG_DEBUG, "port %x prio %d\n", 2298 ntohs(udp->uh_dport), prio); 2299 } 2300 2301 return (prio); 2302 } 2303 2304 /* 2305 * End of token bucket filter modifications 2306 */ 2307 #ifdef RSVP_ISI 2308 int 2309 ip_rsvp_vif_init(struct socket *so, struct mbuf *m) 2310 { 2311 int vifi, s; 2312 2313 if (rsvpdebug) 2314 printf("ip_rsvp_vif_init: so_type = %d, pr_protocol = %d\n", 2315 so->so_type, so->so_proto->pr_protocol); 2316 2317 if (so->so_type != SOCK_RAW || 2318 so->so_proto->pr_protocol != IPPROTO_RSVP) 2319 return (EOPNOTSUPP); 2320 2321 /* Check mbuf. */ 2322 if (m == NULL || m->m_len != sizeof(int)) { 2323 return (EINVAL); 2324 } 2325 vifi = *(mtod(m, int *)); 2326 2327 if (rsvpdebug) 2328 printf("ip_rsvp_vif_init: vif = %d rsvp_on = %d\n", 2329 vifi, rsvp_on); 2330 2331 s = splsoftnet(); 2332 2333 /* Check vif. */ 2334 if (!legal_vif_num(vifi)) { 2335 splx(s); 2336 return (EADDRNOTAVAIL); 2337 } 2338 2339 /* Check if socket is available. */ 2340 if (viftable[vifi].v_rsvpd != NULL) { 2341 splx(s); 2342 return (EADDRINUSE); 2343 } 2344 2345 viftable[vifi].v_rsvpd = so; 2346 /* 2347 * This may seem silly, but we need to be sure we don't over-increment 2348 * the RSVP counter, in case something slips up. 2349 */ 2350 if (!viftable[vifi].v_rsvp_on) { 2351 viftable[vifi].v_rsvp_on = 1; 2352 rsvp_on++; 2353 } 2354 2355 splx(s); 2356 return (0); 2357 } 2358 2359 int 2360 ip_rsvp_vif_done(struct socket *so, struct mbuf *m) 2361 { 2362 int vifi, s; 2363 2364 if (rsvpdebug) 2365 printf("ip_rsvp_vif_done: so_type = %d, pr_protocol = %d\n", 2366 so->so_type, so->so_proto->pr_protocol); 2367 2368 if (so->so_type != SOCK_RAW || 2369 so->so_proto->pr_protocol != IPPROTO_RSVP) 2370 return (EOPNOTSUPP); 2371 2372 /* Check mbuf. */ 2373 if (m == NULL || m->m_len != sizeof(int)) { 2374 return (EINVAL); 2375 } 2376 vifi = *(mtod(m, int *)); 2377 2378 s = splsoftnet(); 2379 2380 /* Check vif. */ 2381 if (!legal_vif_num(vifi)) { 2382 splx(s); 2383 return (EADDRNOTAVAIL); 2384 } 2385 2386 if (rsvpdebug) 2387 printf("ip_rsvp_vif_done: v_rsvpd = %x so = %x\n", 2388 viftable[vifi].v_rsvpd, so); 2389 2390 viftable[vifi].v_rsvpd = NULL; 2391 /* 2392 * This may seem silly, but we need to be sure we don't over-decrement 2393 * the RSVP counter, in case something slips up. 2394 */ 2395 if (viftable[vifi].v_rsvp_on) { 2396 viftable[vifi].v_rsvp_on = 0; 2397 rsvp_on--; 2398 } 2399 2400 splx(s); 2401 return (0); 2402 } 2403 2404 void 2405 ip_rsvp_force_done(struct socket *so) 2406 { 2407 int vifi, s; 2408 2409 /* Don't bother if it is not the right type of socket. */ 2410 if (so->so_type != SOCK_RAW || 2411 so->so_proto->pr_protocol != IPPROTO_RSVP) 2412 return; 2413 2414 s = splsoftnet(); 2415 2416 /* 2417 * The socket may be attached to more than one vif...this 2418 * is perfectly legal. 2419 */ 2420 for (vifi = 0; vifi < numvifs; vifi++) { 2421 if (viftable[vifi].v_rsvpd == so) { 2422 viftable[vifi].v_rsvpd = NULL; 2423 /* 2424 * This may seem silly, but we need to be sure we don't 2425 * over-decrement the RSVP counter, in case something 2426 * slips up. 2427 */ 2428 if (viftable[vifi].v_rsvp_on) { 2429 viftable[vifi].v_rsvp_on = 0; 2430 rsvp_on--; 2431 } 2432 } 2433 } 2434 2435 splx(s); 2436 return; 2437 } 2438 2439 void 2440 rsvp_input(struct mbuf *m, struct ifnet *ifp) 2441 { 2442 int vifi, s; 2443 struct ip *ip = mtod(m, struct ip *); 2444 static struct sockaddr_in rsvp_src = { sizeof(sin), AF_INET }; 2445 2446 if (rsvpdebug) 2447 printf("rsvp_input: rsvp_on %d\n", rsvp_on); 2448 2449 /* 2450 * Can still get packets with rsvp_on = 0 if there is a local member 2451 * of the group to which the RSVP packet is addressed. But in this 2452 * case we want to throw the packet away. 2453 */ 2454 if (!rsvp_on) { 2455 m_freem(m); 2456 return; 2457 } 2458 2459 /* 2460 * If the old-style non-vif-associated socket is set, then use 2461 * it and ignore the new ones. 2462 */ 2463 if (ip_rsvpd != NULL) { 2464 if (rsvpdebug) 2465 printf("rsvp_input: " 2466 "Sending packet up old-style socket\n"); 2467 rip_input(m); /*XXX*/ 2468 return; 2469 } 2470 2471 s = splsoftnet(); 2472 2473 if (rsvpdebug) 2474 printf("rsvp_input: check vifs\n"); 2475 2476 /* Find which vif the packet arrived on. */ 2477 for (vifi = 0; vifi < numvifs; vifi++) { 2478 if (viftable[vifi].v_ifp == ifp) 2479 break; 2480 } 2481 2482 if (vifi == numvifs) { 2483 /* Can't find vif packet arrived on. Drop packet. */ 2484 if (rsvpdebug) 2485 printf("rsvp_input: " 2486 "Can't find vif for packet...dropping it.\n"); 2487 m_freem(m); 2488 splx(s); 2489 return; 2490 } 2491 2492 if (rsvpdebug) 2493 printf("rsvp_input: check socket\n"); 2494 2495 if (viftable[vifi].v_rsvpd == NULL) { 2496 /* 2497 * drop packet, since there is no specific socket for this 2498 * interface 2499 */ 2500 if (rsvpdebug) 2501 printf("rsvp_input: No socket defined for vif %d\n", 2502 vifi); 2503 m_freem(m); 2504 splx(s); 2505 return; 2506 } 2507 2508 rsvp_src.sin_addr = ip->ip_src; 2509 2510 if (rsvpdebug && m) 2511 printf("rsvp_input: m->m_len = %d, sbspace() = %d\n", 2512 m->m_len, sbspace(&viftable[vifi].v_rsvpd->so_rcv)); 2513 2514 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) 2515 if (rsvpdebug) 2516 printf("rsvp_input: Failed to append to socket\n"); 2517 else 2518 if (rsvpdebug) 2519 printf("rsvp_input: send packet up\n"); 2520 2521 splx(s); 2522 } 2523 #endif /* RSVP_ISI */ 2524 2525 /* 2526 * Code for bandwidth monitors 2527 */ 2528 2529 /* 2530 * Define common interface for timeval-related methods 2531 */ 2532 #define BW_TIMEVALCMP(tvp, uvp, cmp) timercmp((tvp), (uvp), cmp) 2533 #define BW_TIMEVALDECR(vvp, uvp) timersub((vvp), (uvp), (vvp)) 2534 #define BW_TIMEVALADD(vvp, uvp) timeradd((vvp), (uvp), (vvp)) 2535 2536 static uint32_t 2537 compute_bw_meter_flags(struct bw_upcall *req) 2538 { 2539 uint32_t flags = 0; 2540 2541 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS) 2542 flags |= BW_METER_UNIT_PACKETS; 2543 if (req->bu_flags & BW_UPCALL_UNIT_BYTES) 2544 flags |= BW_METER_UNIT_BYTES; 2545 if (req->bu_flags & BW_UPCALL_GEQ) 2546 flags |= BW_METER_GEQ; 2547 if (req->bu_flags & BW_UPCALL_LEQ) 2548 flags |= BW_METER_LEQ; 2549 2550 return flags; 2551 } 2552 2553 /* 2554 * Add a bw_meter entry 2555 */ 2556 static int 2557 add_bw_upcall(struct mbuf *m) 2558 { 2559 int s; 2560 struct mfc *mfc; 2561 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC, 2562 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC }; 2563 struct timeval now; 2564 struct bw_meter *x; 2565 uint32_t flags; 2566 struct bw_upcall *req; 2567 2568 if (m == NULL || m->m_len < sizeof(struct bw_upcall)) 2569 return EINVAL; 2570 2571 req = mtod(m, struct bw_upcall *); 2572 2573 if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) 2574 return EOPNOTSUPP; 2575 2576 /* Test if the flags are valid */ 2577 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES))) 2578 return EINVAL; 2579 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))) 2580 return EINVAL; 2581 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 2582 == (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 2583 return EINVAL; 2584 2585 /* Test if the threshold time interval is valid */ 2586 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <)) 2587 return EINVAL; 2588 2589 flags = compute_bw_meter_flags(req); 2590 2591 /* 2592 * Find if we have already same bw_meter entry 2593 */ 2594 s = splsoftnet(); 2595 mfc = mfc_find(&req->bu_src, &req->bu_dst); 2596 if (mfc == NULL) { 2597 splx(s); 2598 return EADDRNOTAVAIL; 2599 } 2600 for (x = mfc->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) { 2601 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 2602 &req->bu_threshold.b_time, ==)) && 2603 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 2604 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 2605 (x->bm_flags & BW_METER_USER_FLAGS) == flags) { 2606 splx(s); 2607 return 0; /* XXX Already installed */ 2608 } 2609 } 2610 2611 /* Allocate the new bw_meter entry */ 2612 x = (struct bw_meter *)malloc(sizeof(*x), M_BWMETER, M_NOWAIT); 2613 if (x == NULL) { 2614 splx(s); 2615 return ENOBUFS; 2616 } 2617 2618 /* Set the new bw_meter entry */ 2619 x->bm_threshold.b_time = req->bu_threshold.b_time; 2620 microtime(&now); 2621 x->bm_start_time = now; 2622 x->bm_threshold.b_packets = req->bu_threshold.b_packets; 2623 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes; 2624 x->bm_measured.b_packets = 0; 2625 x->bm_measured.b_bytes = 0; 2626 x->bm_flags = flags; 2627 x->bm_time_next = NULL; 2628 x->bm_time_hash = BW_METER_BUCKETS; 2629 2630 /* Add the new bw_meter entry to the front of entries for this MFC */ 2631 x->bm_mfc = mfc; 2632 x->bm_mfc_next = mfc->mfc_bw_meter; 2633 mfc->mfc_bw_meter = x; 2634 schedule_bw_meter(x, &now); 2635 splx(s); 2636 2637 return 0; 2638 } 2639 2640 static void 2641 free_bw_list(struct bw_meter *list) 2642 { 2643 while (list != NULL) { 2644 struct bw_meter *x = list; 2645 2646 list = list->bm_mfc_next; 2647 unschedule_bw_meter(x); 2648 free(x, M_BWMETER); 2649 } 2650 } 2651 2652 /* 2653 * Delete one or multiple bw_meter entries 2654 */ 2655 static int 2656 del_bw_upcall(struct mbuf *m) 2657 { 2658 int s; 2659 struct mfc *mfc; 2660 struct bw_meter *x; 2661 struct bw_upcall *req; 2662 2663 if (m == NULL || m->m_len < sizeof(struct bw_upcall)) 2664 return EINVAL; 2665 2666 req = mtod(m, struct bw_upcall *); 2667 2668 if (!(mrt_api_config & MRT_MFC_BW_UPCALL)) 2669 return EOPNOTSUPP; 2670 2671 s = splsoftnet(); 2672 /* Find the corresponding MFC entry */ 2673 mfc = mfc_find(&req->bu_src, &req->bu_dst); 2674 if (mfc == NULL) { 2675 splx(s); 2676 return EADDRNOTAVAIL; 2677 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) { 2678 /* 2679 * Delete all bw_meter entries for this mfc 2680 */ 2681 struct bw_meter *list; 2682 2683 list = mfc->mfc_bw_meter; 2684 mfc->mfc_bw_meter = NULL; 2685 free_bw_list(list); 2686 splx(s); 2687 return 0; 2688 } else { /* Delete a single bw_meter entry */ 2689 struct bw_meter *prev; 2690 uint32_t flags = 0; 2691 2692 flags = compute_bw_meter_flags(req); 2693 2694 /* Find the bw_meter entry to delete */ 2695 for (prev = NULL, x = mfc->mfc_bw_meter; x != NULL; 2696 prev = x, x = x->bm_mfc_next) { 2697 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 2698 &req->bu_threshold.b_time, ==)) && 2699 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 2700 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 2701 (x->bm_flags & BW_METER_USER_FLAGS) == flags) 2702 break; 2703 } 2704 if (x != NULL) { /* Delete entry from the list for this MFC */ 2705 if (prev != NULL) 2706 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/ 2707 else 2708 x->bm_mfc->mfc_bw_meter = x->bm_mfc_next;/* new head of list */ 2709 2710 unschedule_bw_meter(x); 2711 splx(s); 2712 /* Free the bw_meter entry */ 2713 free(x, M_BWMETER); 2714 return 0; 2715 } else { 2716 splx(s); 2717 return EINVAL; 2718 } 2719 } 2720 /* NOTREACHED */ 2721 } 2722 2723 /* 2724 * Perform bandwidth measurement processing that may result in an upcall 2725 */ 2726 static void 2727 bw_meter_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp) 2728 { 2729 struct timeval delta; 2730 2731 delta = *nowp; 2732 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2733 2734 if (x->bm_flags & BW_METER_GEQ) { 2735 /* 2736 * Processing for ">=" type of bw_meter entry 2737 */ 2738 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 2739 /* Reset the bw_meter entry */ 2740 x->bm_start_time = *nowp; 2741 x->bm_measured.b_packets = 0; 2742 x->bm_measured.b_bytes = 0; 2743 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2744 } 2745 2746 /* Record that a packet is received */ 2747 x->bm_measured.b_packets++; 2748 x->bm_measured.b_bytes += plen; 2749 2750 /* 2751 * Test if we should deliver an upcall 2752 */ 2753 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) { 2754 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2755 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) || 2756 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2757 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) { 2758 /* Prepare an upcall for delivery */ 2759 bw_meter_prepare_upcall(x, nowp); 2760 x->bm_flags |= BW_METER_UPCALL_DELIVERED; 2761 } 2762 } 2763 } else if (x->bm_flags & BW_METER_LEQ) { 2764 /* 2765 * Processing for "<=" type of bw_meter entry 2766 */ 2767 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 2768 /* 2769 * We are behind time with the multicast forwarding table 2770 * scanning for "<=" type of bw_meter entries, so test now 2771 * if we should deliver an upcall. 2772 */ 2773 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2774 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2775 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2776 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2777 /* Prepare an upcall for delivery */ 2778 bw_meter_prepare_upcall(x, nowp); 2779 } 2780 /* Reschedule the bw_meter entry */ 2781 unschedule_bw_meter(x); 2782 schedule_bw_meter(x, nowp); 2783 } 2784 2785 /* Record that a packet is received */ 2786 x->bm_measured.b_packets++; 2787 x->bm_measured.b_bytes += plen; 2788 2789 /* 2790 * Test if we should restart the measuring interval 2791 */ 2792 if ((x->bm_flags & BW_METER_UNIT_PACKETS && 2793 x->bm_measured.b_packets <= x->bm_threshold.b_packets) || 2794 (x->bm_flags & BW_METER_UNIT_BYTES && 2795 x->bm_measured.b_bytes <= x->bm_threshold.b_bytes)) { 2796 /* Don't restart the measuring interval */ 2797 } else { 2798 /* Do restart the measuring interval */ 2799 /* 2800 * XXX: note that we don't unschedule and schedule, because this 2801 * might be too much overhead per packet. Instead, when we process 2802 * all entries for a given timer hash bin, we check whether it is 2803 * really a timeout. If not, we reschedule at that time. 2804 */ 2805 x->bm_start_time = *nowp; 2806 x->bm_measured.b_packets = 0; 2807 x->bm_measured.b_bytes = 0; 2808 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2809 } 2810 } 2811 } 2812 2813 /* 2814 * Prepare a bandwidth-related upcall 2815 */ 2816 static void 2817 bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp) 2818 { 2819 struct timeval delta; 2820 struct bw_upcall *u; 2821 2822 /* 2823 * Compute the measured time interval 2824 */ 2825 delta = *nowp; 2826 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2827 2828 /* 2829 * If there are too many pending upcalls, deliver them now 2830 */ 2831 if (bw_upcalls_n >= BW_UPCALLS_MAX) 2832 bw_upcalls_send(); 2833 2834 /* 2835 * Set the bw_upcall entry 2836 */ 2837 u = &bw_upcalls[bw_upcalls_n++]; 2838 u->bu_src = x->bm_mfc->mfc_origin; 2839 u->bu_dst = x->bm_mfc->mfc_mcastgrp; 2840 u->bu_threshold.b_time = x->bm_threshold.b_time; 2841 u->bu_threshold.b_packets = x->bm_threshold.b_packets; 2842 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes; 2843 u->bu_measured.b_time = delta; 2844 u->bu_measured.b_packets = x->bm_measured.b_packets; 2845 u->bu_measured.b_bytes = x->bm_measured.b_bytes; 2846 u->bu_flags = 0; 2847 if (x->bm_flags & BW_METER_UNIT_PACKETS) 2848 u->bu_flags |= BW_UPCALL_UNIT_PACKETS; 2849 if (x->bm_flags & BW_METER_UNIT_BYTES) 2850 u->bu_flags |= BW_UPCALL_UNIT_BYTES; 2851 if (x->bm_flags & BW_METER_GEQ) 2852 u->bu_flags |= BW_UPCALL_GEQ; 2853 if (x->bm_flags & BW_METER_LEQ) 2854 u->bu_flags |= BW_UPCALL_LEQ; 2855 } 2856 2857 /* 2858 * Send the pending bandwidth-related upcalls 2859 */ 2860 static void 2861 bw_upcalls_send(void) 2862 { 2863 struct mbuf *m; 2864 int len = bw_upcalls_n * sizeof(bw_upcalls[0]); 2865 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2866 static struct igmpmsg igmpmsg = { 0, /* unused1 */ 2867 0, /* unused2 */ 2868 IGMPMSG_BW_UPCALL,/* im_msgtype */ 2869 0, /* im_mbz */ 2870 0, /* im_vif */ 2871 0, /* unused3 */ 2872 { 0 }, /* im_src */ 2873 { 0 } }; /* im_dst */ 2874 2875 if (bw_upcalls_n == 0) 2876 return; /* No pending upcalls */ 2877 2878 bw_upcalls_n = 0; 2879 2880 /* 2881 * Allocate a new mbuf, initialize it with the header and 2882 * the payload for the pending calls. 2883 */ 2884 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2885 if (m == NULL) { 2886 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n"); 2887 return; 2888 } 2889 2890 m->m_len = m->m_pkthdr.len = 0; 2891 m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg); 2892 m_copyback(m, sizeof(struct igmpmsg), len, (caddr_t)&bw_upcalls[0]); 2893 2894 /* 2895 * Send the upcalls 2896 * XXX do we need to set the address in k_igmpsrc ? 2897 */ 2898 mrtstat.mrts_upcalls++; 2899 if (socket_send(ip_mrouter, m, &k_igmpsrc) < 0) { 2900 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n"); 2901 ++mrtstat.mrts_upq_sockfull; 2902 } 2903 } 2904 2905 /* 2906 * Compute the timeout hash value for the bw_meter entries 2907 */ 2908 #define BW_METER_TIMEHASH(bw_meter, hash) \ 2909 do { \ 2910 struct timeval next_timeval = (bw_meter)->bm_start_time; \ 2911 \ 2912 BW_TIMEVALADD(&next_timeval, &(bw_meter)->bm_threshold.b_time); \ 2913 (hash) = next_timeval.tv_sec; \ 2914 if (next_timeval.tv_usec) \ 2915 (hash)++; /* XXX: make sure we don't timeout early */ \ 2916 (hash) %= BW_METER_BUCKETS; \ 2917 } while (/*CONSTCOND*/ 0) 2918 2919 /* 2920 * Schedule a timer to process periodically bw_meter entry of type "<=" 2921 * by linking the entry in the proper hash bucket. 2922 */ 2923 static void 2924 schedule_bw_meter(struct bw_meter *x, struct timeval *nowp) 2925 { 2926 int time_hash; 2927 2928 if (!(x->bm_flags & BW_METER_LEQ)) 2929 return; /* XXX: we schedule timers only for "<=" entries */ 2930 2931 /* 2932 * Reset the bw_meter entry 2933 */ 2934 x->bm_start_time = *nowp; 2935 x->bm_measured.b_packets = 0; 2936 x->bm_measured.b_bytes = 0; 2937 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2938 2939 /* 2940 * Compute the timeout hash value and insert the entry 2941 */ 2942 BW_METER_TIMEHASH(x, time_hash); 2943 x->bm_time_next = bw_meter_timers[time_hash]; 2944 bw_meter_timers[time_hash] = x; 2945 x->bm_time_hash = time_hash; 2946 } 2947 2948 /* 2949 * Unschedule the periodic timer that processes bw_meter entry of type "<=" 2950 * by removing the entry from the proper hash bucket. 2951 */ 2952 static void 2953 unschedule_bw_meter(struct bw_meter *x) 2954 { 2955 int time_hash; 2956 struct bw_meter *prev, *tmp; 2957 2958 if (!(x->bm_flags & BW_METER_LEQ)) 2959 return; /* XXX: we schedule timers only for "<=" entries */ 2960 2961 /* 2962 * Compute the timeout hash value and delete the entry 2963 */ 2964 time_hash = x->bm_time_hash; 2965 if (time_hash >= BW_METER_BUCKETS) 2966 return; /* Entry was not scheduled */ 2967 2968 for (prev = NULL, tmp = bw_meter_timers[time_hash]; 2969 tmp != NULL; prev = tmp, tmp = tmp->bm_time_next) 2970 if (tmp == x) 2971 break; 2972 2973 if (tmp == NULL) 2974 panic("unschedule_bw_meter: bw_meter entry not found"); 2975 2976 if (prev != NULL) 2977 prev->bm_time_next = x->bm_time_next; 2978 else 2979 bw_meter_timers[time_hash] = x->bm_time_next; 2980 2981 x->bm_time_next = NULL; 2982 x->bm_time_hash = BW_METER_BUCKETS; 2983 } 2984 2985 /* 2986 * Process all "<=" type of bw_meter that should be processed now, 2987 * and for each entry prepare an upcall if necessary. Each processed 2988 * entry is rescheduled again for the (periodic) processing. 2989 * 2990 * This is run periodically (once per second normally). On each round, 2991 * all the potentially matching entries are in the hash slot that we are 2992 * looking at. 2993 */ 2994 static void 2995 bw_meter_process(void) 2996 { 2997 int s; 2998 static uint32_t last_tv_sec; /* last time we processed this */ 2999 3000 uint32_t loops; 3001 int i; 3002 struct timeval now, process_endtime; 3003 3004 microtime(&now); 3005 if (last_tv_sec == now.tv_sec) 3006 return; /* nothing to do */ 3007 3008 loops = now.tv_sec - last_tv_sec; 3009 last_tv_sec = now.tv_sec; 3010 if (loops > BW_METER_BUCKETS) 3011 loops = BW_METER_BUCKETS; 3012 3013 s = splsoftnet(); 3014 /* 3015 * Process all bins of bw_meter entries from the one after the last 3016 * processed to the current one. On entry, i points to the last bucket 3017 * visited, so we need to increment i at the beginning of the loop. 3018 */ 3019 for (i = (now.tv_sec - loops) % BW_METER_BUCKETS; loops > 0; loops--) { 3020 struct bw_meter *x, *tmp_list; 3021 3022 if (++i >= BW_METER_BUCKETS) 3023 i = 0; 3024 3025 /* Disconnect the list of bw_meter entries from the bin */ 3026 tmp_list = bw_meter_timers[i]; 3027 bw_meter_timers[i] = NULL; 3028 3029 /* Process the list of bw_meter entries */ 3030 while (tmp_list != NULL) { 3031 x = tmp_list; 3032 tmp_list = tmp_list->bm_time_next; 3033 3034 /* Test if the time interval is over */ 3035 process_endtime = x->bm_start_time; 3036 BW_TIMEVALADD(&process_endtime, &x->bm_threshold.b_time); 3037 if (BW_TIMEVALCMP(&process_endtime, &now, >)) { 3038 /* Not yet: reschedule, but don't reset */ 3039 int time_hash; 3040 3041 BW_METER_TIMEHASH(x, time_hash); 3042 if (time_hash == i && process_endtime.tv_sec == now.tv_sec) { 3043 /* 3044 * XXX: somehow the bin processing is a bit ahead of time. 3045 * Put the entry in the next bin. 3046 */ 3047 if (++time_hash >= BW_METER_BUCKETS) 3048 time_hash = 0; 3049 } 3050 x->bm_time_next = bw_meter_timers[time_hash]; 3051 bw_meter_timers[time_hash] = x; 3052 x->bm_time_hash = time_hash; 3053 3054 continue; 3055 } 3056 3057 /* 3058 * Test if we should deliver an upcall 3059 */ 3060 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 3061 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 3062 ((x->bm_flags & BW_METER_UNIT_BYTES) && 3063 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 3064 /* Prepare an upcall for delivery */ 3065 bw_meter_prepare_upcall(x, &now); 3066 } 3067 3068 /* 3069 * Reschedule for next processing 3070 */ 3071 schedule_bw_meter(x, &now); 3072 } 3073 } 3074 3075 /* Send all upcalls that are pending delivery */ 3076 bw_upcalls_send(); 3077 3078 splx(s); 3079 } 3080 3081 /* 3082 * A periodic function for sending all upcalls that are pending delivery 3083 */ 3084 static void 3085 expire_bw_upcalls_send(void *unused) 3086 { 3087 int s; 3088 3089 s = splsoftnet(); 3090 bw_upcalls_send(); 3091 splx(s); 3092 3093 callout_reset(&bw_upcalls_ch, BW_UPCALLS_PERIOD, 3094 expire_bw_upcalls_send, NULL); 3095 } 3096 3097 /* 3098 * A periodic function for periodic scanning of the multicast forwarding 3099 * table for processing all "<=" bw_meter entries. 3100 */ 3101 static void 3102 expire_bw_meter_process(void *unused) 3103 { 3104 if (mrt_api_config & MRT_MFC_BW_UPCALL) 3105 bw_meter_process(); 3106 3107 callout_reset(&bw_meter_ch, BW_METER_PERIOD, 3108 expire_bw_meter_process, NULL); 3109 } 3110 3111 /* 3112 * End of bandwidth monitoring code 3113 */ 3114 3115 #ifdef PIM 3116 /* 3117 * Send the packet up to the user daemon, or eventually do kernel encapsulation 3118 */ 3119 static int 3120 pim_register_send(struct ip *ip, struct vif *vifp, 3121 struct mbuf *m, struct mfc *rt) 3122 { 3123 struct mbuf *mb_copy, *mm; 3124 3125 if (mrtdebug & DEBUG_PIM) 3126 log(LOG_DEBUG, "pim_register_send: "); 3127 3128 mb_copy = pim_register_prepare(ip, m); 3129 if (mb_copy == NULL) 3130 return ENOBUFS; 3131 3132 /* 3133 * Send all the fragments. Note that the mbuf for each fragment 3134 * is freed by the sending machinery. 3135 */ 3136 for (mm = mb_copy; mm; mm = mb_copy) { 3137 mb_copy = mm->m_nextpkt; 3138 mm->m_nextpkt = NULL; 3139 mm = m_pullup(mm, sizeof(struct ip)); 3140 if (mm != NULL) { 3141 ip = mtod(mm, struct ip *); 3142 if ((mrt_api_config & MRT_MFC_RP) && 3143 !in_nullhost(rt->mfc_rp)) { 3144 pim_register_send_rp(ip, vifp, mm, rt); 3145 } else { 3146 pim_register_send_upcall(ip, vifp, mm, rt); 3147 } 3148 } 3149 } 3150 3151 return 0; 3152 } 3153 3154 /* 3155 * Return a copy of the data packet that is ready for PIM Register 3156 * encapsulation. 3157 * XXX: Note that in the returned copy the IP header is a valid one. 3158 */ 3159 static struct mbuf * 3160 pim_register_prepare(struct ip *ip, struct mbuf *m) 3161 { 3162 struct mbuf *mb_copy = NULL; 3163 int mtu; 3164 3165 /* Take care of delayed checksums */ 3166 if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 3167 in_delayed_cksum(m); 3168 m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 3169 } 3170 3171 /* 3172 * Copy the old packet & pullup its IP header into the 3173 * new mbuf so we can modify it. 3174 */ 3175 mb_copy = m_copy(m, 0, M_COPYALL); 3176 if (mb_copy == NULL) 3177 return NULL; 3178 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2); 3179 if (mb_copy == NULL) 3180 return NULL; 3181 3182 /* take care of the TTL */ 3183 ip = mtod(mb_copy, struct ip *); 3184 --ip->ip_ttl; 3185 3186 /* Compute the MTU after the PIM Register encapsulation */ 3187 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr); 3188 3189 if (ntohs(ip->ip_len) <= mtu) { 3190 /* Turn the IP header into a valid one */ 3191 ip->ip_sum = 0; 3192 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 3193 } else { 3194 /* Fragment the packet */ 3195 if (ip_fragment(mb_copy, NULL, mtu) != 0) { 3196 /* XXX: mb_copy was freed by ip_fragment() */ 3197 return NULL; 3198 } 3199 } 3200 return mb_copy; 3201 } 3202 3203 /* 3204 * Send an upcall with the data packet to the user-level process. 3205 */ 3206 static int 3207 pim_register_send_upcall(struct ip *ip, struct vif *vifp, 3208 struct mbuf *mb_copy, struct mfc *rt) 3209 { 3210 struct mbuf *mb_first; 3211 int len = ntohs(ip->ip_len); 3212 struct igmpmsg *im; 3213 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 3214 3215 /* 3216 * Add a new mbuf with an upcall header 3217 */ 3218 MGETHDR(mb_first, M_DONTWAIT, MT_HEADER); 3219 if (mb_first == NULL) { 3220 m_freem(mb_copy); 3221 return ENOBUFS; 3222 } 3223 mb_first->m_data += max_linkhdr; 3224 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg); 3225 mb_first->m_len = sizeof(struct igmpmsg); 3226 mb_first->m_next = mb_copy; 3227 3228 /* Send message to routing daemon */ 3229 im = mtod(mb_first, struct igmpmsg *); 3230 im->im_msgtype = IGMPMSG_WHOLEPKT; 3231 im->im_mbz = 0; 3232 im->im_vif = vifp - viftable; 3233 im->im_src = ip->ip_src; 3234 im->im_dst = ip->ip_dst; 3235 3236 k_igmpsrc.sin_addr = ip->ip_src; 3237 3238 mrtstat.mrts_upcalls++; 3239 3240 if (socket_send(ip_mrouter, mb_first, &k_igmpsrc) < 0) { 3241 if (mrtdebug & DEBUG_PIM) 3242 log(LOG_WARNING, 3243 "mcast: pim_register_send_upcall: ip_mrouter socket queue full"); 3244 ++mrtstat.mrts_upq_sockfull; 3245 return ENOBUFS; 3246 } 3247 3248 /* Keep statistics */ 3249 pimstat.pims_snd_registers_msgs++; 3250 pimstat.pims_snd_registers_bytes += len; 3251 3252 return 0; 3253 } 3254 3255 /* 3256 * Encapsulate the data packet in PIM Register message and send it to the RP. 3257 */ 3258 static int 3259 pim_register_send_rp(struct ip *ip, struct vif *vifp, 3260 struct mbuf *mb_copy, struct mfc *rt) 3261 { 3262 struct mbuf *mb_first; 3263 struct ip *ip_outer; 3264 struct pim_encap_pimhdr *pimhdr; 3265 int len = ntohs(ip->ip_len); 3266 vifi_t vifi = rt->mfc_parent; 3267 3268 if ((vifi >= numvifs) || in_nullhost(viftable[vifi].v_lcl_addr)) { 3269 m_freem(mb_copy); 3270 return EADDRNOTAVAIL; /* The iif vif is invalid */ 3271 } 3272 3273 /* 3274 * Add a new mbuf with the encapsulating header 3275 */ 3276 MGETHDR(mb_first, M_DONTWAIT, MT_HEADER); 3277 if (mb_first == NULL) { 3278 m_freem(mb_copy); 3279 return ENOBUFS; 3280 } 3281 mb_first->m_data += max_linkhdr; 3282 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 3283 mb_first->m_next = mb_copy; 3284 3285 mb_first->m_pkthdr.len = len + mb_first->m_len; 3286 3287 /* 3288 * Fill in the encapsulating IP and PIM header 3289 */ 3290 ip_outer = mtod(mb_first, struct ip *); 3291 *ip_outer = pim_encap_iphdr; 3292 ip_outer->ip_id = ip_newid(); 3293 ip_outer->ip_len = htons(len + sizeof(pim_encap_iphdr) + 3294 sizeof(pim_encap_pimhdr)); 3295 ip_outer->ip_src = viftable[vifi].v_lcl_addr; 3296 ip_outer->ip_dst = rt->mfc_rp; 3297 /* 3298 * Copy the inner header TOS to the outer header, and take care of the 3299 * IP_DF bit. 3300 */ 3301 ip_outer->ip_tos = ip->ip_tos; 3302 if (ntohs(ip->ip_off) & IP_DF) 3303 ip_outer->ip_off |= IP_DF; 3304 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer 3305 + sizeof(pim_encap_iphdr)); 3306 *pimhdr = pim_encap_pimhdr; 3307 /* If the iif crosses a border, set the Border-bit */ 3308 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & mrt_api_config) 3309 pimhdr->flags |= htonl(PIM_BORDER_REGISTER); 3310 3311 mb_first->m_data += sizeof(pim_encap_iphdr); 3312 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr)); 3313 mb_first->m_data -= sizeof(pim_encap_iphdr); 3314 3315 if (vifp->v_rate_limit == 0) 3316 tbf_send_packet(vifp, mb_first); 3317 else 3318 tbf_control(vifp, mb_first, ip, ntohs(ip_outer->ip_len)); 3319 3320 /* Keep statistics */ 3321 pimstat.pims_snd_registers_msgs++; 3322 pimstat.pims_snd_registers_bytes += len; 3323 3324 return 0; 3325 } 3326 3327 /* 3328 * PIM-SMv2 and PIM-DM messages processing. 3329 * Receives and verifies the PIM control messages, and passes them 3330 * up to the listening socket, using rip_input(). 3331 * The only message with special processing is the PIM_REGISTER message 3332 * (used by PIM-SM): the PIM header is stripped off, and the inner packet 3333 * is passed to if_simloop(). 3334 */ 3335 void 3336 pim_input(struct mbuf *m, ...) 3337 { 3338 struct ip *ip = mtod(m, struct ip *); 3339 struct pim *pim; 3340 int minlen; 3341 int datalen; 3342 int ip_tos; 3343 int proto; 3344 int iphlen; 3345 va_list ap; 3346 3347 va_start(ap, m); 3348 iphlen = va_arg(ap, int); 3349 proto = va_arg(ap, int); 3350 va_end(ap); 3351 3352 datalen = ntohs(ip->ip_len) - iphlen; 3353 3354 /* Keep statistics */ 3355 pimstat.pims_rcv_total_msgs++; 3356 pimstat.pims_rcv_total_bytes += datalen; 3357 3358 /* 3359 * Validate lengths 3360 */ 3361 if (datalen < PIM_MINLEN) { 3362 pimstat.pims_rcv_tooshort++; 3363 log(LOG_ERR, "pim_input: packet size too small %d from %lx\n", 3364 datalen, (u_long)ip->ip_src.s_addr); 3365 m_freem(m); 3366 return; 3367 } 3368 3369 /* 3370 * If the packet is at least as big as a REGISTER, go agead 3371 * and grab the PIM REGISTER header size, to avoid another 3372 * possible m_pullup() later. 3373 * 3374 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8 3375 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28 3376 */ 3377 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN); 3378 /* 3379 * Get the IP and PIM headers in contiguous memory, and 3380 * possibly the PIM REGISTER header. 3381 */ 3382 if ((m->m_flags & M_EXT || m->m_len < minlen) && 3383 (m = m_pullup(m, minlen)) == NULL) { 3384 log(LOG_ERR, "pim_input: m_pullup failure\n"); 3385 return; 3386 } 3387 /* m_pullup() may have given us a new mbuf so reset ip. */ 3388 ip = mtod(m, struct ip *); 3389 ip_tos = ip->ip_tos; 3390 3391 /* adjust mbuf to point to the PIM header */ 3392 m->m_data += iphlen; 3393 m->m_len -= iphlen; 3394 pim = mtod(m, struct pim *); 3395 3396 /* 3397 * Validate checksum. If PIM REGISTER, exclude the data packet. 3398 * 3399 * XXX: some older PIMv2 implementations don't make this distinction, 3400 * so for compatibility reason perform the checksum over part of the 3401 * message, and if error, then over the whole message. 3402 */ 3403 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) { 3404 /* do nothing, checksum okay */ 3405 } else if (in_cksum(m, datalen)) { 3406 pimstat.pims_rcv_badsum++; 3407 if (mrtdebug & DEBUG_PIM) 3408 log(LOG_DEBUG, "pim_input: invalid checksum"); 3409 m_freem(m); 3410 return; 3411 } 3412 3413 /* PIM version check */ 3414 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) { 3415 pimstat.pims_rcv_badversion++; 3416 log(LOG_ERR, "pim_input: incorrect version %d, expecting %d\n", 3417 PIM_VT_V(pim->pim_vt), PIM_VERSION); 3418 m_freem(m); 3419 return; 3420 } 3421 3422 /* restore mbuf back to the outer IP */ 3423 m->m_data -= iphlen; 3424 m->m_len += iphlen; 3425 3426 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) { 3427 /* 3428 * Since this is a REGISTER, we'll make a copy of the register 3429 * headers ip + pim + u_int32 + encap_ip, to be passed up to the 3430 * routing daemon. 3431 */ 3432 int s; 3433 struct sockaddr_in dst = { sizeof(dst), AF_INET }; 3434 struct mbuf *mcp; 3435 struct ip *encap_ip; 3436 u_int32_t *reghdr; 3437 struct ifnet *vifp; 3438 3439 s = splsoftnet(); 3440 if ((reg_vif_num >= numvifs) || (reg_vif_num == VIFI_INVALID)) { 3441 splx(s); 3442 if (mrtdebug & DEBUG_PIM) 3443 log(LOG_DEBUG, 3444 "pim_input: register vif not set: %d\n", reg_vif_num); 3445 m_freem(m); 3446 return; 3447 } 3448 /* XXX need refcnt? */ 3449 vifp = viftable[reg_vif_num].v_ifp; 3450 splx(s); 3451 3452 /* 3453 * Validate length 3454 */ 3455 if (datalen < PIM_REG_MINLEN) { 3456 pimstat.pims_rcv_tooshort++; 3457 pimstat.pims_rcv_badregisters++; 3458 log(LOG_ERR, 3459 "pim_input: register packet size too small %d from %lx\n", 3460 datalen, (u_long)ip->ip_src.s_addr); 3461 m_freem(m); 3462 return; 3463 } 3464 3465 reghdr = (u_int32_t *)(pim + 1); 3466 encap_ip = (struct ip *)(reghdr + 1); 3467 3468 if (mrtdebug & DEBUG_PIM) { 3469 log(LOG_DEBUG, 3470 "pim_input[register], encap_ip: %lx -> %lx, encap_ip len %d\n", 3471 (u_long)ntohl(encap_ip->ip_src.s_addr), 3472 (u_long)ntohl(encap_ip->ip_dst.s_addr), 3473 ntohs(encap_ip->ip_len)); 3474 } 3475 3476 /* verify the version number of the inner packet */ 3477 if (encap_ip->ip_v != IPVERSION) { 3478 pimstat.pims_rcv_badregisters++; 3479 if (mrtdebug & DEBUG_PIM) { 3480 log(LOG_DEBUG, "pim_input: invalid IP version (%d) " 3481 "of the inner packet\n", encap_ip->ip_v); 3482 } 3483 m_freem(m); 3484 return; 3485 } 3486 3487 /* verify the inner packet is destined to a mcast group */ 3488 if (!IN_MULTICAST(encap_ip->ip_dst.s_addr)) { 3489 pimstat.pims_rcv_badregisters++; 3490 if (mrtdebug & DEBUG_PIM) 3491 log(LOG_DEBUG, 3492 "pim_input: inner packet of register is not " 3493 "multicast %lx\n", 3494 (u_long)ntohl(encap_ip->ip_dst.s_addr)); 3495 m_freem(m); 3496 return; 3497 } 3498 3499 /* If a NULL_REGISTER, pass it to the daemon */ 3500 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 3501 goto pim_input_to_daemon; 3502 3503 /* 3504 * Copy the TOS from the outer IP header to the inner IP header. 3505 */ 3506 if (encap_ip->ip_tos != ip_tos) { 3507 /* Outer TOS -> inner TOS */ 3508 encap_ip->ip_tos = ip_tos; 3509 /* Recompute the inner header checksum. Sigh... */ 3510 3511 /* adjust mbuf to point to the inner IP header */ 3512 m->m_data += (iphlen + PIM_MINLEN); 3513 m->m_len -= (iphlen + PIM_MINLEN); 3514 3515 encap_ip->ip_sum = 0; 3516 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2); 3517 3518 /* restore mbuf to point back to the outer IP header */ 3519 m->m_data -= (iphlen + PIM_MINLEN); 3520 m->m_len += (iphlen + PIM_MINLEN); 3521 } 3522 3523 /* 3524 * Decapsulate the inner IP packet and loopback to forward it 3525 * as a normal multicast packet. Also, make a copy of the 3526 * outer_iphdr + pimhdr + reghdr + encap_iphdr 3527 * to pass to the daemon later, so it can take the appropriate 3528 * actions (e.g., send back PIM_REGISTER_STOP). 3529 * XXX: here m->m_data points to the outer IP header. 3530 */ 3531 mcp = m_copy(m, 0, iphlen + PIM_REG_MINLEN); 3532 if (mcp == NULL) { 3533 log(LOG_ERR, 3534 "pim_input: pim register: could not copy register head\n"); 3535 m_freem(m); 3536 return; 3537 } 3538 3539 /* Keep statistics */ 3540 /* XXX: registers_bytes include only the encap. mcast pkt */ 3541 pimstat.pims_rcv_registers_msgs++; 3542 pimstat.pims_rcv_registers_bytes += ntohs(encap_ip->ip_len); 3543 3544 /* 3545 * forward the inner ip packet; point m_data at the inner ip. 3546 */ 3547 m_adj(m, iphlen + PIM_MINLEN); 3548 3549 if (mrtdebug & DEBUG_PIM) { 3550 log(LOG_DEBUG, 3551 "pim_input: forwarding decapsulated register: " 3552 "src %lx, dst %lx, vif %d\n", 3553 (u_long)ntohl(encap_ip->ip_src.s_addr), 3554 (u_long)ntohl(encap_ip->ip_dst.s_addr), 3555 reg_vif_num); 3556 } 3557 /* NB: vifp was collected above; can it change on us? */ 3558 looutput(vifp, m, (struct sockaddr *)&dst, (struct rtentry *)NULL); 3559 3560 /* prepare the register head to send to the mrouting daemon */ 3561 m = mcp; 3562 } 3563 3564 pim_input_to_daemon: 3565 /* 3566 * Pass the PIM message up to the daemon; if it is a Register message, 3567 * pass the 'head' only up to the daemon. This includes the 3568 * outer IP header, PIM header, PIM-Register header and the 3569 * inner IP header. 3570 * XXX: the outer IP header pkt size of a Register is not adjust to 3571 * reflect the fact that the inner multicast data is truncated. 3572 */ 3573 rip_input(m, iphlen, proto); 3574 3575 return; 3576 } 3577 #endif /* PIM */ 3578