ip_mroute.c revision 267654
1/*- 2 * Copyright (c) 1989 Stephen Deering 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Stephen Deering of Stanford University. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 34 */ 35 36/* 37 * IP multicast forwarding procedures 38 * 39 * Written by David Waitzman, BBN Labs, August 1988. 40 * Modified by Steve Deering, Stanford, February 1989. 41 * Modified by Mark J. Steiglitz, Stanford, May, 1991 42 * Modified by Van Jacobson, LBL, January 1993 43 * Modified by Ajit Thyagarajan, PARC, August 1993 44 * Modified by Bill Fenner, PARC, April 1995 45 * Modified by Ahmed Helmy, SGI, June 1996 46 * Modified by George Edmond Eddy (Rusty), ISI, February 1998 47 * Modified by Pavlin Radoslavov, USC/ISI, May 1998, August 1999, October 2000 48 * Modified by Hitoshi Asaeda, WIDE, August 2000 49 * Modified by Pavlin Radoslavov, ICSI, October 2002 50 * 51 * MROUTING Revision: 3.5 52 * and PIM-SMv2 and PIM-DM support, advanced API support, 53 * bandwidth metering and signaling 54 */ 55 56/* 57 * TODO: Prefix functions with ipmf_. 58 * TODO: Maintain a refcount on if_allmulti() in ifnet or in the protocol 59 * domain attachment (if_afdata) so we can track consumers of that service. 60 * TODO: Deprecate routing socket path for SIOCGETSGCNT and SIOCGETVIFCNT, 61 * move it to socket options. 62 * TODO: Cleanup LSRR removal further. 63 * TODO: Push RSVP stubs into raw_ip.c. 64 * TODO: Use bitstring.h for vif set. 65 * TODO: Fix mrt6_ioctl dangling ref when dynamically loaded. 66 * TODO: Sync ip6_mroute.c with this file. 67 */ 68 69#include <sys/cdefs.h> 70__FBSDID("$FreeBSD: releng/9.3/sys/netinet/ip_mroute.c 263316 2014-03-18 20:05:55Z delphij $"); 71 72#include "opt_inet.h" 73#include "opt_mrouting.h" 74 75#define _PIM_VT 1 76 77#include <sys/param.h> 78#include <sys/kernel.h> 79#include <sys/stddef.h> 80#include <sys/lock.h> 81#include <sys/ktr.h> 82#include <sys/malloc.h> 83#include <sys/mbuf.h> 84#include <sys/module.h> 85#include <sys/priv.h> 86#include <sys/protosw.h> 87#include <sys/signalvar.h> 88#include <sys/socket.h> 89#include <sys/socketvar.h> 90#include <sys/sockio.h> 91#include <sys/sx.h> 92#include <sys/sysctl.h> 93#include <sys/syslog.h> 94#include <sys/systm.h> 95#include <sys/time.h> 96 97#include <net/if.h> 98#include <net/netisr.h> 99#include <net/route.h> 100#include <net/vnet.h> 101 102#include <netinet/in.h> 103#include <netinet/igmp.h> 104#include <netinet/in_systm.h> 105#include <netinet/in_var.h> 106#include <netinet/ip.h> 107#include <netinet/ip_encap.h> 108#include <netinet/ip_mroute.h> 109#include <netinet/ip_var.h> 110#include <netinet/ip_options.h> 111#include <netinet/pim.h> 112#include <netinet/pim_var.h> 113#include <netinet/udp.h> 114 115#include <machine/in_cksum.h> 116 117#ifndef KTR_IPMF 118#define KTR_IPMF KTR_INET 119#endif 120 121#define VIFI_INVALID ((vifi_t) -1) 122#define M_HASCL(m) ((m)->m_flags & M_EXT) 123 124static VNET_DEFINE(uint32_t, last_tv_sec); /* last time we processed this */ 125#define V_last_tv_sec VNET(last_tv_sec) 126 127static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast forwarding cache"); 128 129/* 130 * Locking. We use two locks: one for the virtual interface table and 131 * one for the forwarding table. These locks may be nested in which case 132 * the VIF lock must always be taken first. Note that each lock is used 133 * to cover not only the specific data structure but also related data 134 * structures. 135 */ 136 137static struct mtx mrouter_mtx; 138#define MROUTER_LOCK() mtx_lock(&mrouter_mtx) 139#define MROUTER_UNLOCK() mtx_unlock(&mrouter_mtx) 140#define MROUTER_LOCK_ASSERT() mtx_assert(&mrouter_mtx, MA_OWNED) 141#define MROUTER_LOCK_INIT() \ 142 mtx_init(&mrouter_mtx, "IPv4 multicast forwarding", NULL, MTX_DEF) 143#define MROUTER_LOCK_DESTROY() mtx_destroy(&mrouter_mtx) 144 145static int ip_mrouter_cnt; /* # of vnets with active mrouters */ 146static int ip_mrouter_unloading; /* Allow no more V_ip_mrouter sockets */ 147 148static VNET_DEFINE(struct mrtstat, mrtstat); 149#define V_mrtstat VNET(mrtstat) 150SYSCTL_VNET_STRUCT(_net_inet_ip, OID_AUTO, mrtstat, CTLFLAG_RW, 151 &VNET_NAME(mrtstat), mrtstat, 152 "IPv4 Multicast Forwarding Statistics (struct mrtstat, " 153 "netinet/ip_mroute.h)"); 154 155static VNET_DEFINE(u_long, mfchash); 156#define V_mfchash VNET(mfchash) 157#define MFCHASH(a, g) \ 158 ((((a).s_addr >> 20) ^ ((a).s_addr >> 10) ^ (a).s_addr ^ \ 159 ((g).s_addr >> 20) ^ ((g).s_addr >> 10) ^ (g).s_addr) & V_mfchash) 160#define MFCHASHSIZE 256 161 162static u_long mfchashsize; /* Hash size */ 163static VNET_DEFINE(u_char *, nexpire); /* 0..mfchashsize-1 */ 164#define V_nexpire VNET(nexpire) 165static VNET_DEFINE(LIST_HEAD(mfchashhdr, mfc)*, mfchashtbl); 166#define V_mfchashtbl VNET(mfchashtbl) 167 168static struct mtx mfc_mtx; 169#define MFC_LOCK() mtx_lock(&mfc_mtx) 170#define MFC_UNLOCK() mtx_unlock(&mfc_mtx) 171#define MFC_LOCK_ASSERT() mtx_assert(&mfc_mtx, MA_OWNED) 172#define MFC_LOCK_INIT() \ 173 mtx_init(&mfc_mtx, "IPv4 multicast forwarding cache", NULL, MTX_DEF) 174#define MFC_LOCK_DESTROY() mtx_destroy(&mfc_mtx) 175 176static VNET_DEFINE(vifi_t, numvifs); 177#define V_numvifs VNET(numvifs) 178static VNET_DEFINE(struct vif, viftable[MAXVIFS]); 179#define V_viftable VNET(viftable) 180SYSCTL_VNET_OPAQUE(_net_inet_ip, OID_AUTO, viftable, CTLFLAG_RD, 181 &VNET_NAME(viftable), sizeof(V_viftable), "S,vif[MAXVIFS]", 182 "IPv4 Multicast Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)"); 183 184static struct mtx vif_mtx; 185#define VIF_LOCK() mtx_lock(&vif_mtx) 186#define VIF_UNLOCK() mtx_unlock(&vif_mtx) 187#define VIF_LOCK_ASSERT() mtx_assert(&vif_mtx, MA_OWNED) 188#define VIF_LOCK_INIT() \ 189 mtx_init(&vif_mtx, "IPv4 multicast interfaces", NULL, MTX_DEF) 190#define VIF_LOCK_DESTROY() mtx_destroy(&vif_mtx) 191 192static eventhandler_tag if_detach_event_tag = NULL; 193 194static VNET_DEFINE(struct callout, expire_upcalls_ch); 195#define V_expire_upcalls_ch VNET(expire_upcalls_ch) 196 197#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 198#define UPCALL_EXPIRE 6 /* number of timeouts */ 199 200/* 201 * Bandwidth meter variables and constants 202 */ 203static MALLOC_DEFINE(M_BWMETER, "bwmeter", "multicast upcall bw meters"); 204/* 205 * Pending timeouts are stored in a hash table, the key being the 206 * expiration time. Periodically, the entries are analysed and processed. 207 */ 208#define BW_METER_BUCKETS 1024 209static VNET_DEFINE(struct bw_meter*, bw_meter_timers[BW_METER_BUCKETS]); 210#define V_bw_meter_timers VNET(bw_meter_timers) 211static VNET_DEFINE(struct callout, bw_meter_ch); 212#define V_bw_meter_ch VNET(bw_meter_ch) 213#define BW_METER_PERIOD (hz) /* periodical handling of bw meters */ 214 215/* 216 * Pending upcalls are stored in a vector which is flushed when 217 * full, or periodically 218 */ 219static VNET_DEFINE(struct bw_upcall, bw_upcalls[BW_UPCALLS_MAX]); 220#define V_bw_upcalls VNET(bw_upcalls) 221static VNET_DEFINE(u_int, bw_upcalls_n); /* # of pending upcalls */ 222#define V_bw_upcalls_n VNET(bw_upcalls_n) 223static VNET_DEFINE(struct callout, bw_upcalls_ch); 224#define V_bw_upcalls_ch VNET(bw_upcalls_ch) 225 226#define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */ 227 228static VNET_DEFINE(struct pimstat, pimstat); 229#define V_pimstat VNET(pimstat) 230 231SYSCTL_NODE(_net_inet, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 232SYSCTL_VNET_STRUCT(_net_inet_pim, PIMCTL_STATS, stats, CTLFLAG_RD, 233 &VNET_NAME(pimstat), pimstat, 234 "PIM Statistics (struct pimstat, netinet/pim_var.h)"); 235 236static u_long pim_squelch_wholepkt = 0; 237SYSCTL_ULONG(_net_inet_pim, OID_AUTO, squelch_wholepkt, CTLFLAG_RW, 238 &pim_squelch_wholepkt, 0, 239 "Disable IGMP_WHOLEPKT notifications if rendezvous point is unspecified"); 240 241extern struct domain inetdomain; 242static const struct protosw in_pim_protosw = { 243 .pr_type = SOCK_RAW, 244 .pr_domain = &inetdomain, 245 .pr_protocol = IPPROTO_PIM, 246 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 247 .pr_input = pim_input, 248 .pr_output = (pr_output_t*)rip_output, 249 .pr_ctloutput = rip_ctloutput, 250 .pr_usrreqs = &rip_usrreqs 251}; 252static const struct encaptab *pim_encap_cookie; 253 254static int pim_encapcheck(const struct mbuf *, int, int, void *); 255 256/* 257 * Note: the PIM Register encapsulation adds the following in front of a 258 * data packet: 259 * 260 * struct pim_encap_hdr { 261 * struct ip ip; 262 * struct pim_encap_pimhdr pim; 263 * } 264 * 265 */ 266 267struct pim_encap_pimhdr { 268 struct pim pim; 269 uint32_t flags; 270}; 271#define PIM_ENCAP_TTL 64 272 273static struct ip pim_encap_iphdr = { 274#if BYTE_ORDER == LITTLE_ENDIAN 275 sizeof(struct ip) >> 2, 276 IPVERSION, 277#else 278 IPVERSION, 279 sizeof(struct ip) >> 2, 280#endif 281 0, /* tos */ 282 sizeof(struct ip), /* total length */ 283 0, /* id */ 284 0, /* frag offset */ 285 PIM_ENCAP_TTL, 286 IPPROTO_PIM, 287 0, /* checksum */ 288}; 289 290static struct pim_encap_pimhdr pim_encap_pimhdr = { 291 { 292 PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */ 293 0, /* reserved */ 294 0, /* checksum */ 295 }, 296 0 /* flags */ 297}; 298 299static VNET_DEFINE(vifi_t, reg_vif_num) = VIFI_INVALID; 300#define V_reg_vif_num VNET(reg_vif_num) 301static VNET_DEFINE(struct ifnet, multicast_register_if); 302#define V_multicast_register_if VNET(multicast_register_if) 303 304/* 305 * Private variables. 306 */ 307 308static u_long X_ip_mcast_src(int); 309static int X_ip_mforward(struct ip *, struct ifnet *, struct mbuf *, 310 struct ip_moptions *); 311static int X_ip_mrouter_done(void); 312static int X_ip_mrouter_get(struct socket *, struct sockopt *); 313static int X_ip_mrouter_set(struct socket *, struct sockopt *); 314static int X_legal_vif_num(int); 315static int X_mrt_ioctl(u_long, caddr_t, int); 316 317static int add_bw_upcall(struct bw_upcall *); 318static int add_mfc(struct mfcctl2 *); 319static int add_vif(struct vifctl *); 320static void bw_meter_prepare_upcall(struct bw_meter *, struct timeval *); 321static void bw_meter_process(void); 322static void bw_meter_receive_packet(struct bw_meter *, int, 323 struct timeval *); 324static void bw_upcalls_send(void); 325static int del_bw_upcall(struct bw_upcall *); 326static int del_mfc(struct mfcctl2 *); 327static int del_vif(vifi_t); 328static int del_vif_locked(vifi_t); 329static void expire_bw_meter_process(void *); 330static void expire_bw_upcalls_send(void *); 331static void expire_mfc(struct mfc *); 332static void expire_upcalls(void *); 333static void free_bw_list(struct bw_meter *); 334static int get_sg_cnt(struct sioc_sg_req *); 335static int get_vif_cnt(struct sioc_vif_req *); 336static void if_detached_event(void *, struct ifnet *); 337static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t); 338static int ip_mrouter_init(struct socket *, int); 339static __inline struct mfc * 340 mfc_find(struct in_addr *, struct in_addr *); 341static void phyint_send(struct ip *, struct vif *, struct mbuf *); 342static struct mbuf * 343 pim_register_prepare(struct ip *, struct mbuf *); 344static int pim_register_send(struct ip *, struct vif *, 345 struct mbuf *, struct mfc *); 346static int pim_register_send_rp(struct ip *, struct vif *, 347 struct mbuf *, struct mfc *); 348static int pim_register_send_upcall(struct ip *, struct vif *, 349 struct mbuf *, struct mfc *); 350static void schedule_bw_meter(struct bw_meter *, struct timeval *); 351static void send_packet(struct vif *, struct mbuf *); 352static int set_api_config(uint32_t *); 353static int set_assert(int); 354static int socket_send(struct socket *, struct mbuf *, 355 struct sockaddr_in *); 356static void unschedule_bw_meter(struct bw_meter *); 357 358/* 359 * Kernel multicast forwarding API capabilities and setup. 360 * If more API capabilities are added to the kernel, they should be 361 * recorded in `mrt_api_support'. 362 */ 363#define MRT_API_VERSION 0x0305 364 365static const int mrt_api_version = MRT_API_VERSION; 366static const uint32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF | 367 MRT_MFC_FLAGS_BORDER_VIF | 368 MRT_MFC_RP | 369 MRT_MFC_BW_UPCALL); 370static VNET_DEFINE(uint32_t, mrt_api_config); 371#define V_mrt_api_config VNET(mrt_api_config) 372static VNET_DEFINE(int, pim_assert_enabled); 373#define V_pim_assert_enabled VNET(pim_assert_enabled) 374static struct timeval pim_assert_interval = { 3, 0 }; /* Rate limit */ 375 376/* 377 * Find a route for a given origin IP address and multicast group address. 378 * Statistics must be updated by the caller. 379 */ 380static __inline struct mfc * 381mfc_find(struct in_addr *o, struct in_addr *g) 382{ 383 struct mfc *rt; 384 385 MFC_LOCK_ASSERT(); 386 387 LIST_FOREACH(rt, &V_mfchashtbl[MFCHASH(*o, *g)], mfc_hash) { 388 if (in_hosteq(rt->mfc_origin, *o) && 389 in_hosteq(rt->mfc_mcastgrp, *g) && 390 TAILQ_EMPTY(&rt->mfc_stall)) 391 break; 392 } 393 394 return (rt); 395} 396 397/* 398 * Handle MRT setsockopt commands to modify the multicast forwarding tables. 399 */ 400static int 401X_ip_mrouter_set(struct socket *so, struct sockopt *sopt) 402{ 403 int error, optval; 404 vifi_t vifi; 405 struct vifctl vifc; 406 struct mfcctl2 mfc; 407 struct bw_upcall bw_upcall; 408 uint32_t i; 409 410 if (so != V_ip_mrouter && sopt->sopt_name != MRT_INIT) 411 return EPERM; 412 413 error = 0; 414 switch (sopt->sopt_name) { 415 case MRT_INIT: 416 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 417 if (error) 418 break; 419 error = ip_mrouter_init(so, optval); 420 break; 421 422 case MRT_DONE: 423 error = ip_mrouter_done(); 424 break; 425 426 case MRT_ADD_VIF: 427 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc); 428 if (error) 429 break; 430 error = add_vif(&vifc); 431 break; 432 433 case MRT_DEL_VIF: 434 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi); 435 if (error) 436 break; 437 error = del_vif(vifi); 438 break; 439 440 case MRT_ADD_MFC: 441 case MRT_DEL_MFC: 442 /* 443 * select data size depending on API version. 444 */ 445 if (sopt->sopt_name == MRT_ADD_MFC && 446 V_mrt_api_config & MRT_API_FLAGS_ALL) { 447 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl2), 448 sizeof(struct mfcctl2)); 449 } else { 450 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl), 451 sizeof(struct mfcctl)); 452 bzero((caddr_t)&mfc + sizeof(struct mfcctl), 453 sizeof(mfc) - sizeof(struct mfcctl)); 454 } 455 if (error) 456 break; 457 if (sopt->sopt_name == MRT_ADD_MFC) 458 error = add_mfc(&mfc); 459 else 460 error = del_mfc(&mfc); 461 break; 462 463 case MRT_ASSERT: 464 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 465 if (error) 466 break; 467 set_assert(optval); 468 break; 469 470 case MRT_API_CONFIG: 471 error = sooptcopyin(sopt, &i, sizeof i, sizeof i); 472 if (!error) 473 error = set_api_config(&i); 474 if (!error) 475 error = sooptcopyout(sopt, &i, sizeof i); 476 break; 477 478 case MRT_ADD_BW_UPCALL: 479 case MRT_DEL_BW_UPCALL: 480 error = sooptcopyin(sopt, &bw_upcall, sizeof bw_upcall, 481 sizeof bw_upcall); 482 if (error) 483 break; 484 if (sopt->sopt_name == MRT_ADD_BW_UPCALL) 485 error = add_bw_upcall(&bw_upcall); 486 else 487 error = del_bw_upcall(&bw_upcall); 488 break; 489 490 default: 491 error = EOPNOTSUPP; 492 break; 493 } 494 return error; 495} 496 497/* 498 * Handle MRT getsockopt commands 499 */ 500static int 501X_ip_mrouter_get(struct socket *so, struct sockopt *sopt) 502{ 503 int error; 504 505 switch (sopt->sopt_name) { 506 case MRT_VERSION: 507 error = sooptcopyout(sopt, &mrt_api_version, sizeof mrt_api_version); 508 break; 509 510 case MRT_ASSERT: 511 error = sooptcopyout(sopt, &V_pim_assert_enabled, 512 sizeof V_pim_assert_enabled); 513 break; 514 515 case MRT_API_SUPPORT: 516 error = sooptcopyout(sopt, &mrt_api_support, sizeof mrt_api_support); 517 break; 518 519 case MRT_API_CONFIG: 520 error = sooptcopyout(sopt, &V_mrt_api_config, sizeof V_mrt_api_config); 521 break; 522 523 default: 524 error = EOPNOTSUPP; 525 break; 526 } 527 return error; 528} 529 530/* 531 * Handle ioctl commands to obtain information from the cache 532 */ 533static int 534X_mrt_ioctl(u_long cmd, caddr_t data, int fibnum __unused) 535{ 536 int error = 0; 537 538 /* 539 * Currently the only function calling this ioctl routine is rtioctl(). 540 * Typically, only root can create the raw socket in order to execute 541 * this ioctl method, however the request might be coming from a prison 542 */ 543 error = priv_check(curthread, PRIV_NETINET_MROUTE); 544 if (error) 545 return (error); 546 switch (cmd) { 547 case (SIOCGETVIFCNT): 548 error = get_vif_cnt((struct sioc_vif_req *)data); 549 break; 550 551 case (SIOCGETSGCNT): 552 error = get_sg_cnt((struct sioc_sg_req *)data); 553 break; 554 555 default: 556 error = EINVAL; 557 break; 558 } 559 return error; 560} 561 562/* 563 * returns the packet, byte, rpf-failure count for the source group provided 564 */ 565static int 566get_sg_cnt(struct sioc_sg_req *req) 567{ 568 struct mfc *rt; 569 570 MFC_LOCK(); 571 rt = mfc_find(&req->src, &req->grp); 572 if (rt == NULL) { 573 MFC_UNLOCK(); 574 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 575 return EADDRNOTAVAIL; 576 } 577 req->pktcnt = rt->mfc_pkt_cnt; 578 req->bytecnt = rt->mfc_byte_cnt; 579 req->wrong_if = rt->mfc_wrong_if; 580 MFC_UNLOCK(); 581 return 0; 582} 583 584/* 585 * returns the input and output packet and byte counts on the vif provided 586 */ 587static int 588get_vif_cnt(struct sioc_vif_req *req) 589{ 590 vifi_t vifi = req->vifi; 591 592 VIF_LOCK(); 593 if (vifi >= V_numvifs) { 594 VIF_UNLOCK(); 595 return EINVAL; 596 } 597 598 req->icount = V_viftable[vifi].v_pkt_in; 599 req->ocount = V_viftable[vifi].v_pkt_out; 600 req->ibytes = V_viftable[vifi].v_bytes_in; 601 req->obytes = V_viftable[vifi].v_bytes_out; 602 VIF_UNLOCK(); 603 604 return 0; 605} 606 607static void 608if_detached_event(void *arg __unused, struct ifnet *ifp) 609{ 610 vifi_t vifi; 611 u_long i; 612 613 MROUTER_LOCK(); 614 615 if (V_ip_mrouter == NULL) { 616 MROUTER_UNLOCK(); 617 return; 618 } 619 620 VIF_LOCK(); 621 MFC_LOCK(); 622 623 /* 624 * Tear down multicast forwarder state associated with this ifnet. 625 * 1. Walk the vif list, matching vifs against this ifnet. 626 * 2. Walk the multicast forwarding cache (mfc) looking for 627 * inner matches with this vif's index. 628 * 3. Expire any matching multicast forwarding cache entries. 629 * 4. Free vif state. This should disable ALLMULTI on the interface. 630 */ 631 for (vifi = 0; vifi < V_numvifs; vifi++) { 632 if (V_viftable[vifi].v_ifp != ifp) 633 continue; 634 for (i = 0; i < mfchashsize; i++) { 635 struct mfc *rt, *nrt; 636 for (rt = LIST_FIRST(&V_mfchashtbl[i]); rt; rt = nrt) { 637 nrt = LIST_NEXT(rt, mfc_hash); 638 if (rt->mfc_parent == vifi) { 639 expire_mfc(rt); 640 } 641 } 642 } 643 del_vif_locked(vifi); 644 } 645 646 MFC_UNLOCK(); 647 VIF_UNLOCK(); 648 649 MROUTER_UNLOCK(); 650} 651 652/* 653 * Enable multicast forwarding. 654 */ 655static int 656ip_mrouter_init(struct socket *so, int version) 657{ 658 659 CTR3(KTR_IPMF, "%s: so_type %d, pr_protocol %d", __func__, 660 so->so_type, so->so_proto->pr_protocol); 661 662 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP) 663 return EOPNOTSUPP; 664 665 if (version != 1) 666 return ENOPROTOOPT; 667 668 MROUTER_LOCK(); 669 670 if (ip_mrouter_unloading) { 671 MROUTER_UNLOCK(); 672 return ENOPROTOOPT; 673 } 674 675 if (V_ip_mrouter != NULL) { 676 MROUTER_UNLOCK(); 677 return EADDRINUSE; 678 } 679 680 V_mfchashtbl = hashinit_flags(mfchashsize, M_MRTABLE, &V_mfchash, 681 HASH_NOWAIT); 682 683 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, 684 curvnet); 685 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send, 686 curvnet); 687 callout_reset(&V_bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, 688 curvnet); 689 690 V_ip_mrouter = so; 691 ip_mrouter_cnt++; 692 693 MROUTER_UNLOCK(); 694 695 CTR1(KTR_IPMF, "%s: done", __func__); 696 697 return 0; 698} 699 700/* 701 * Disable multicast forwarding. 702 */ 703static int 704X_ip_mrouter_done(void) 705{ 706 struct ifnet *ifp; 707 u_long i; 708 vifi_t vifi; 709 710 MROUTER_LOCK(); 711 712 if (V_ip_mrouter == NULL) { 713 MROUTER_UNLOCK(); 714 return EINVAL; 715 } 716 717 /* 718 * Detach/disable hooks to the reset of the system. 719 */ 720 V_ip_mrouter = NULL; 721 ip_mrouter_cnt--; 722 V_mrt_api_config = 0; 723 724 VIF_LOCK(); 725 726 /* 727 * For each phyint in use, disable promiscuous reception of all IP 728 * multicasts. 729 */ 730 for (vifi = 0; vifi < V_numvifs; vifi++) { 731 if (!in_nullhost(V_viftable[vifi].v_lcl_addr) && 732 !(V_viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) { 733 ifp = V_viftable[vifi].v_ifp; 734 if_allmulti(ifp, 0); 735 } 736 } 737 bzero((caddr_t)V_viftable, sizeof(V_viftable)); 738 V_numvifs = 0; 739 V_pim_assert_enabled = 0; 740 741 VIF_UNLOCK(); 742 743 callout_stop(&V_expire_upcalls_ch); 744 callout_stop(&V_bw_upcalls_ch); 745 callout_stop(&V_bw_meter_ch); 746 747 MFC_LOCK(); 748 749 /* 750 * Free all multicast forwarding cache entries. 751 * Do not use hashdestroy(), as we must perform other cleanup. 752 */ 753 for (i = 0; i < mfchashsize; i++) { 754 struct mfc *rt, *nrt; 755 for (rt = LIST_FIRST(&V_mfchashtbl[i]); rt; rt = nrt) { 756 nrt = LIST_NEXT(rt, mfc_hash); 757 expire_mfc(rt); 758 } 759 } 760 free(V_mfchashtbl, M_MRTABLE); 761 V_mfchashtbl = NULL; 762 763 bzero(V_nexpire, sizeof(V_nexpire[0]) * mfchashsize); 764 765 V_bw_upcalls_n = 0; 766 bzero(V_bw_meter_timers, sizeof(V_bw_meter_timers)); 767 768 MFC_UNLOCK(); 769 770 V_reg_vif_num = VIFI_INVALID; 771 772 MROUTER_UNLOCK(); 773 774 CTR1(KTR_IPMF, "%s: done", __func__); 775 776 return 0; 777} 778 779/* 780 * Set PIM assert processing global 781 */ 782static int 783set_assert(int i) 784{ 785 if ((i != 1) && (i != 0)) 786 return EINVAL; 787 788 V_pim_assert_enabled = i; 789 790 return 0; 791} 792 793/* 794 * Configure API capabilities 795 */ 796int 797set_api_config(uint32_t *apival) 798{ 799 u_long i; 800 801 /* 802 * We can set the API capabilities only if it is the first operation 803 * after MRT_INIT. I.e.: 804 * - there are no vifs installed 805 * - pim_assert is not enabled 806 * - the MFC table is empty 807 */ 808 if (V_numvifs > 0) { 809 *apival = 0; 810 return EPERM; 811 } 812 if (V_pim_assert_enabled) { 813 *apival = 0; 814 return EPERM; 815 } 816 817 MFC_LOCK(); 818 819 for (i = 0; i < mfchashsize; i++) { 820 if (LIST_FIRST(&V_mfchashtbl[i]) != NULL) { 821 MFC_UNLOCK(); 822 *apival = 0; 823 return EPERM; 824 } 825 } 826 827 MFC_UNLOCK(); 828 829 V_mrt_api_config = *apival & mrt_api_support; 830 *apival = V_mrt_api_config; 831 832 return 0; 833} 834 835/* 836 * Add a vif to the vif table 837 */ 838static int 839add_vif(struct vifctl *vifcp) 840{ 841 struct vif *vifp = V_viftable + vifcp->vifc_vifi; 842 struct sockaddr_in sin = {sizeof sin, AF_INET}; 843 struct ifaddr *ifa; 844 struct ifnet *ifp; 845 int error; 846 847 VIF_LOCK(); 848 if (vifcp->vifc_vifi >= MAXVIFS) { 849 VIF_UNLOCK(); 850 return EINVAL; 851 } 852 /* rate limiting is no longer supported by this code */ 853 if (vifcp->vifc_rate_limit != 0) { 854 log(LOG_ERR, "rate limiting is no longer supported\n"); 855 VIF_UNLOCK(); 856 return EINVAL; 857 } 858 if (!in_nullhost(vifp->v_lcl_addr)) { 859 VIF_UNLOCK(); 860 return EADDRINUSE; 861 } 862 if (in_nullhost(vifcp->vifc_lcl_addr)) { 863 VIF_UNLOCK(); 864 return EADDRNOTAVAIL; 865 } 866 867 /* Find the interface with an address in AF_INET family */ 868 if (vifcp->vifc_flags & VIFF_REGISTER) { 869 /* 870 * XXX: Because VIFF_REGISTER does not really need a valid 871 * local interface (e.g. it could be 127.0.0.2), we don't 872 * check its address. 873 */ 874 ifp = NULL; 875 } else { 876 sin.sin_addr = vifcp->vifc_lcl_addr; 877 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 878 if (ifa == NULL) { 879 VIF_UNLOCK(); 880 return EADDRNOTAVAIL; 881 } 882 ifp = ifa->ifa_ifp; 883 ifa_free(ifa); 884 } 885 886 if ((vifcp->vifc_flags & VIFF_TUNNEL) != 0) { 887 CTR1(KTR_IPMF, "%s: tunnels are no longer supported", __func__); 888 VIF_UNLOCK(); 889 return EOPNOTSUPP; 890 } else if (vifcp->vifc_flags & VIFF_REGISTER) { 891 ifp = &V_multicast_register_if; 892 CTR2(KTR_IPMF, "%s: add register vif for ifp %p", __func__, ifp); 893 if (V_reg_vif_num == VIFI_INVALID) { 894 if_initname(&V_multicast_register_if, "register_vif", 0); 895 V_multicast_register_if.if_flags = IFF_LOOPBACK; 896 V_reg_vif_num = vifcp->vifc_vifi; 897 } 898 } else { /* Make sure the interface supports multicast */ 899 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 900 VIF_UNLOCK(); 901 return EOPNOTSUPP; 902 } 903 904 /* Enable promiscuous reception of all IP multicasts from the if */ 905 error = if_allmulti(ifp, 1); 906 if (error) { 907 VIF_UNLOCK(); 908 return error; 909 } 910 } 911 912 vifp->v_flags = vifcp->vifc_flags; 913 vifp->v_threshold = vifcp->vifc_threshold; 914 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 915 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 916 vifp->v_ifp = ifp; 917 /* initialize per vif pkt counters */ 918 vifp->v_pkt_in = 0; 919 vifp->v_pkt_out = 0; 920 vifp->v_bytes_in = 0; 921 vifp->v_bytes_out = 0; 922 923 /* Adjust numvifs up if the vifi is higher than numvifs */ 924 if (V_numvifs <= vifcp->vifc_vifi) 925 V_numvifs = vifcp->vifc_vifi + 1; 926 927 VIF_UNLOCK(); 928 929 CTR4(KTR_IPMF, "%s: add vif %d laddr %s thresh %x", __func__, 930 (int)vifcp->vifc_vifi, inet_ntoa(vifcp->vifc_lcl_addr), 931 (int)vifcp->vifc_threshold); 932 933 return 0; 934} 935 936/* 937 * Delete a vif from the vif table 938 */ 939static int 940del_vif_locked(vifi_t vifi) 941{ 942 struct vif *vifp; 943 944 VIF_LOCK_ASSERT(); 945 946 if (vifi >= V_numvifs) { 947 return EINVAL; 948 } 949 vifp = &V_viftable[vifi]; 950 if (in_nullhost(vifp->v_lcl_addr)) { 951 return EADDRNOTAVAIL; 952 } 953 954 if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) 955 if_allmulti(vifp->v_ifp, 0); 956 957 if (vifp->v_flags & VIFF_REGISTER) 958 V_reg_vif_num = VIFI_INVALID; 959 960 bzero((caddr_t)vifp, sizeof (*vifp)); 961 962 CTR2(KTR_IPMF, "%s: delete vif %d", __func__, (int)vifi); 963 964 /* Adjust numvifs down */ 965 for (vifi = V_numvifs; vifi > 0; vifi--) 966 if (!in_nullhost(V_viftable[vifi-1].v_lcl_addr)) 967 break; 968 V_numvifs = vifi; 969 970 return 0; 971} 972 973static int 974del_vif(vifi_t vifi) 975{ 976 int cc; 977 978 VIF_LOCK(); 979 cc = del_vif_locked(vifi); 980 VIF_UNLOCK(); 981 982 return cc; 983} 984 985/* 986 * update an mfc entry without resetting counters and S,G addresses. 987 */ 988static void 989update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 990{ 991 int i; 992 993 rt->mfc_parent = mfccp->mfcc_parent; 994 for (i = 0; i < V_numvifs; i++) { 995 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 996 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & V_mrt_api_config & 997 MRT_MFC_FLAGS_ALL; 998 } 999 /* set the RP address */ 1000 if (V_mrt_api_config & MRT_MFC_RP) 1001 rt->mfc_rp = mfccp->mfcc_rp; 1002 else 1003 rt->mfc_rp.s_addr = INADDR_ANY; 1004} 1005 1006/* 1007 * fully initialize an mfc entry from the parameter. 1008 */ 1009static void 1010init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 1011{ 1012 rt->mfc_origin = mfccp->mfcc_origin; 1013 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 1014 1015 update_mfc_params(rt, mfccp); 1016 1017 /* initialize pkt counters per src-grp */ 1018 rt->mfc_pkt_cnt = 0; 1019 rt->mfc_byte_cnt = 0; 1020 rt->mfc_wrong_if = 0; 1021 timevalclear(&rt->mfc_last_assert); 1022} 1023 1024static void 1025expire_mfc(struct mfc *rt) 1026{ 1027 struct rtdetq *rte, *nrte; 1028 1029 MFC_LOCK_ASSERT(); 1030 1031 free_bw_list(rt->mfc_bw_meter); 1032 1033 TAILQ_FOREACH_SAFE(rte, &rt->mfc_stall, rte_link, nrte) { 1034 m_freem(rte->m); 1035 TAILQ_REMOVE(&rt->mfc_stall, rte, rte_link); 1036 free(rte, M_MRTABLE); 1037 } 1038 1039 LIST_REMOVE(rt, mfc_hash); 1040 free(rt, M_MRTABLE); 1041} 1042 1043/* 1044 * Add an mfc entry 1045 */ 1046static int 1047add_mfc(struct mfcctl2 *mfccp) 1048{ 1049 struct mfc *rt; 1050 struct rtdetq *rte, *nrte; 1051 u_long hash = 0; 1052 u_short nstl; 1053 1054 VIF_LOCK(); 1055 MFC_LOCK(); 1056 1057 rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp); 1058 1059 /* If an entry already exists, just update the fields */ 1060 if (rt) { 1061 CTR4(KTR_IPMF, "%s: update mfc orig %s group %lx parent %x", 1062 __func__, inet_ntoa(mfccp->mfcc_origin), 1063 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1064 mfccp->mfcc_parent); 1065 update_mfc_params(rt, mfccp); 1066 MFC_UNLOCK(); 1067 VIF_UNLOCK(); 1068 return (0); 1069 } 1070 1071 /* 1072 * Find the entry for which the upcall was made and update 1073 */ 1074 nstl = 0; 1075 hash = MFCHASH(mfccp->mfcc_origin, mfccp->mfcc_mcastgrp); 1076 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) { 1077 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) && 1078 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp) && 1079 !TAILQ_EMPTY(&rt->mfc_stall)) { 1080 CTR5(KTR_IPMF, 1081 "%s: add mfc orig %s group %lx parent %x qh %p", 1082 __func__, inet_ntoa(mfccp->mfcc_origin), 1083 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1084 mfccp->mfcc_parent, 1085 TAILQ_FIRST(&rt->mfc_stall)); 1086 if (nstl++) 1087 CTR1(KTR_IPMF, "%s: multiple matches", __func__); 1088 1089 init_mfc_params(rt, mfccp); 1090 rt->mfc_expire = 0; /* Don't clean this guy up */ 1091 V_nexpire[hash]--; 1092 1093 /* Free queued packets, but attempt to forward them first. */ 1094 TAILQ_FOREACH_SAFE(rte, &rt->mfc_stall, rte_link, nrte) { 1095 if (rte->ifp != NULL) 1096 ip_mdq(rte->m, rte->ifp, rt, -1); 1097 m_freem(rte->m); 1098 TAILQ_REMOVE(&rt->mfc_stall, rte, rte_link); 1099 rt->mfc_nstall--; 1100 free(rte, M_MRTABLE); 1101 } 1102 } 1103 } 1104 1105 /* 1106 * It is possible that an entry is being inserted without an upcall 1107 */ 1108 if (nstl == 0) { 1109 CTR1(KTR_IPMF, "%s: adding mfc w/o upcall", __func__); 1110 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) { 1111 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) && 1112 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp)) { 1113 init_mfc_params(rt, mfccp); 1114 if (rt->mfc_expire) 1115 V_nexpire[hash]--; 1116 rt->mfc_expire = 0; 1117 break; /* XXX */ 1118 } 1119 } 1120 1121 if (rt == NULL) { /* no upcall, so make a new entry */ 1122 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1123 if (rt == NULL) { 1124 MFC_UNLOCK(); 1125 VIF_UNLOCK(); 1126 return (ENOBUFS); 1127 } 1128 1129 init_mfc_params(rt, mfccp); 1130 TAILQ_INIT(&rt->mfc_stall); 1131 rt->mfc_nstall = 0; 1132 1133 rt->mfc_expire = 0; 1134 rt->mfc_bw_meter = NULL; 1135 1136 /* insert new entry at head of hash chain */ 1137 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash); 1138 } 1139 } 1140 1141 MFC_UNLOCK(); 1142 VIF_UNLOCK(); 1143 1144 return (0); 1145} 1146 1147/* 1148 * Delete an mfc entry 1149 */ 1150static int 1151del_mfc(struct mfcctl2 *mfccp) 1152{ 1153 struct in_addr origin; 1154 struct in_addr mcastgrp; 1155 struct mfc *rt; 1156 1157 origin = mfccp->mfcc_origin; 1158 mcastgrp = mfccp->mfcc_mcastgrp; 1159 1160 CTR3(KTR_IPMF, "%s: delete mfc orig %s group %lx", __func__, 1161 inet_ntoa(origin), (u_long)ntohl(mcastgrp.s_addr)); 1162 1163 MFC_LOCK(); 1164 1165 rt = mfc_find(&origin, &mcastgrp); 1166 if (rt == NULL) { 1167 MFC_UNLOCK(); 1168 return EADDRNOTAVAIL; 1169 } 1170 1171 /* 1172 * free the bw_meter entries 1173 */ 1174 free_bw_list(rt->mfc_bw_meter); 1175 rt->mfc_bw_meter = NULL; 1176 1177 LIST_REMOVE(rt, mfc_hash); 1178 free(rt, M_MRTABLE); 1179 1180 MFC_UNLOCK(); 1181 1182 return (0); 1183} 1184 1185/* 1186 * Send a message to the routing daemon on the multicast routing socket. 1187 */ 1188static int 1189socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src) 1190{ 1191 if (s) { 1192 SOCKBUF_LOCK(&s->so_rcv); 1193 if (sbappendaddr_locked(&s->so_rcv, (struct sockaddr *)src, mm, 1194 NULL) != 0) { 1195 sorwakeup_locked(s); 1196 return 0; 1197 } 1198 SOCKBUF_UNLOCK(&s->so_rcv); 1199 } 1200 m_freem(mm); 1201 return -1; 1202} 1203 1204/* 1205 * IP multicast forwarding function. This function assumes that the packet 1206 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1207 * pointed to by "ifp", and the packet is to be relayed to other networks 1208 * that have members of the packet's destination IP multicast group. 1209 * 1210 * The packet is returned unscathed to the caller, unless it is 1211 * erroneous, in which case a non-zero return value tells the caller to 1212 * discard it. 1213 */ 1214 1215#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1216 1217static int 1218X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m, 1219 struct ip_moptions *imo) 1220{ 1221 struct mfc *rt; 1222 int error; 1223 vifi_t vifi; 1224 1225 CTR3(KTR_IPMF, "ip_mforward: delete mfc orig %s group %lx ifp %p", 1226 inet_ntoa(ip->ip_src), (u_long)ntohl(ip->ip_dst.s_addr), ifp); 1227 1228 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 || 1229 ((u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1230 /* 1231 * Packet arrived via a physical interface or 1232 * an encapsulated tunnel or a register_vif. 1233 */ 1234 } else { 1235 /* 1236 * Packet arrived through a source-route tunnel. 1237 * Source-route tunnels are no longer supported. 1238 */ 1239 return (1); 1240 } 1241 1242 VIF_LOCK(); 1243 MFC_LOCK(); 1244 if (imo && ((vifi = imo->imo_multicast_vif) < V_numvifs)) { 1245 if (ip->ip_ttl < MAXTTL) 1246 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1247 error = ip_mdq(m, ifp, NULL, vifi); 1248 MFC_UNLOCK(); 1249 VIF_UNLOCK(); 1250 return error; 1251 } 1252 1253 /* 1254 * Don't forward a packet with time-to-live of zero or one, 1255 * or a packet destined to a local-only group. 1256 */ 1257 if (ip->ip_ttl <= 1 || IN_LOCAL_GROUP(ntohl(ip->ip_dst.s_addr))) { 1258 MFC_UNLOCK(); 1259 VIF_UNLOCK(); 1260 return 0; 1261 } 1262 1263 /* 1264 * Determine forwarding vifs from the forwarding cache table 1265 */ 1266 MRTSTAT_INC(mrts_mfc_lookups); 1267 rt = mfc_find(&ip->ip_src, &ip->ip_dst); 1268 1269 /* Entry exists, so forward if necessary */ 1270 if (rt != NULL) { 1271 error = ip_mdq(m, ifp, rt, -1); 1272 MFC_UNLOCK(); 1273 VIF_UNLOCK(); 1274 return error; 1275 } else { 1276 /* 1277 * If we don't have a route for packet's origin, 1278 * Make a copy of the packet & send message to routing daemon 1279 */ 1280 1281 struct mbuf *mb0; 1282 struct rtdetq *rte; 1283 u_long hash; 1284 int hlen = ip->ip_hl << 2; 1285 1286 MRTSTAT_INC(mrts_mfc_misses); 1287 MRTSTAT_INC(mrts_no_route); 1288 CTR2(KTR_IPMF, "ip_mforward: no mfc for (%s,%lx)", 1289 inet_ntoa(ip->ip_src), (u_long)ntohl(ip->ip_dst.s_addr)); 1290 1291 /* 1292 * Allocate mbufs early so that we don't do extra work if we are 1293 * just going to fail anyway. Make sure to pullup the header so 1294 * that other people can't step on it. 1295 */ 1296 rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, 1297 M_NOWAIT|M_ZERO); 1298 if (rte == NULL) { 1299 MFC_UNLOCK(); 1300 VIF_UNLOCK(); 1301 return ENOBUFS; 1302 } 1303 1304 mb0 = m_copypacket(m, M_DONTWAIT); 1305 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen)) 1306 mb0 = m_pullup(mb0, hlen); 1307 if (mb0 == NULL) { 1308 free(rte, M_MRTABLE); 1309 MFC_UNLOCK(); 1310 VIF_UNLOCK(); 1311 return ENOBUFS; 1312 } 1313 1314 /* is there an upcall waiting for this flow ? */ 1315 hash = MFCHASH(ip->ip_src, ip->ip_dst); 1316 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) { 1317 if (in_hosteq(ip->ip_src, rt->mfc_origin) && 1318 in_hosteq(ip->ip_dst, rt->mfc_mcastgrp) && 1319 !TAILQ_EMPTY(&rt->mfc_stall)) 1320 break; 1321 } 1322 1323 if (rt == NULL) { 1324 int i; 1325 struct igmpmsg *im; 1326 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1327 struct mbuf *mm; 1328 1329 /* 1330 * Locate the vifi for the incoming interface for this packet. 1331 * If none found, drop packet. 1332 */ 1333 for (vifi = 0; vifi < V_numvifs && 1334 V_viftable[vifi].v_ifp != ifp; vifi++) 1335 ; 1336 if (vifi >= V_numvifs) /* vif not found, drop packet */ 1337 goto non_fatal; 1338 1339 /* no upcall, so make a new entry */ 1340 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1341 if (rt == NULL) 1342 goto fail; 1343 1344 /* Make a copy of the header to send to the user level process */ 1345 mm = m_copy(mb0, 0, hlen); 1346 if (mm == NULL) 1347 goto fail1; 1348 1349 /* 1350 * Send message to routing daemon to install 1351 * a route into the kernel table 1352 */ 1353 1354 im = mtod(mm, struct igmpmsg *); 1355 im->im_msgtype = IGMPMSG_NOCACHE; 1356 im->im_mbz = 0; 1357 im->im_vif = vifi; 1358 1359 MRTSTAT_INC(mrts_upcalls); 1360 1361 k_igmpsrc.sin_addr = ip->ip_src; 1362 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) { 1363 CTR0(KTR_IPMF, "ip_mforward: socket queue full"); 1364 MRTSTAT_INC(mrts_upq_sockfull); 1365fail1: 1366 free(rt, M_MRTABLE); 1367fail: 1368 free(rte, M_MRTABLE); 1369 m_freem(mb0); 1370 MFC_UNLOCK(); 1371 VIF_UNLOCK(); 1372 return ENOBUFS; 1373 } 1374 1375 /* insert new entry at head of hash chain */ 1376 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1377 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1378 rt->mfc_expire = UPCALL_EXPIRE; 1379 V_nexpire[hash]++; 1380 for (i = 0; i < V_numvifs; i++) { 1381 rt->mfc_ttls[i] = 0; 1382 rt->mfc_flags[i] = 0; 1383 } 1384 rt->mfc_parent = -1; 1385 1386 /* clear the RP address */ 1387 rt->mfc_rp.s_addr = INADDR_ANY; 1388 rt->mfc_bw_meter = NULL; 1389 1390 /* initialize pkt counters per src-grp */ 1391 rt->mfc_pkt_cnt = 0; 1392 rt->mfc_byte_cnt = 0; 1393 rt->mfc_wrong_if = 0; 1394 timevalclear(&rt->mfc_last_assert); 1395 1396 TAILQ_INIT(&rt->mfc_stall); 1397 rt->mfc_nstall = 0; 1398 1399 /* link into table */ 1400 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash); 1401 TAILQ_INSERT_HEAD(&rt->mfc_stall, rte, rte_link); 1402 rt->mfc_nstall++; 1403 1404 } else { 1405 /* determine if queue has overflowed */ 1406 if (rt->mfc_nstall > MAX_UPQ) { 1407 MRTSTAT_INC(mrts_upq_ovflw); 1408non_fatal: 1409 free(rte, M_MRTABLE); 1410 m_freem(mb0); 1411 MFC_UNLOCK(); 1412 VIF_UNLOCK(); 1413 return (0); 1414 } 1415 TAILQ_INSERT_TAIL(&rt->mfc_stall, rte, rte_link); 1416 rt->mfc_nstall++; 1417 } 1418 1419 rte->m = mb0; 1420 rte->ifp = ifp; 1421 1422 MFC_UNLOCK(); 1423 VIF_UNLOCK(); 1424 1425 return 0; 1426 } 1427} 1428 1429/* 1430 * Clean up the cache entry if upcall is not serviced 1431 */ 1432static void 1433expire_upcalls(void *arg) 1434{ 1435 u_long i; 1436 1437 CURVNET_SET((struct vnet *) arg); 1438 1439 MFC_LOCK(); 1440 1441 for (i = 0; i < mfchashsize; i++) { 1442 struct mfc *rt, *nrt; 1443 1444 if (V_nexpire[i] == 0) 1445 continue; 1446 1447 for (rt = LIST_FIRST(&V_mfchashtbl[i]); rt; rt = nrt) { 1448 nrt = LIST_NEXT(rt, mfc_hash); 1449 1450 if (TAILQ_EMPTY(&rt->mfc_stall)) 1451 continue; 1452 1453 if (rt->mfc_expire == 0 || --rt->mfc_expire > 0) 1454 continue; 1455 1456 /* 1457 * free the bw_meter entries 1458 */ 1459 while (rt->mfc_bw_meter != NULL) { 1460 struct bw_meter *x = rt->mfc_bw_meter; 1461 1462 rt->mfc_bw_meter = x->bm_mfc_next; 1463 free(x, M_BWMETER); 1464 } 1465 1466 MRTSTAT_INC(mrts_cache_cleanups); 1467 CTR3(KTR_IPMF, "%s: expire (%lx, %lx)", __func__, 1468 (u_long)ntohl(rt->mfc_origin.s_addr), 1469 (u_long)ntohl(rt->mfc_mcastgrp.s_addr)); 1470 1471 expire_mfc(rt); 1472 } 1473 } 1474 1475 MFC_UNLOCK(); 1476 1477 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, 1478 curvnet); 1479 1480 CURVNET_RESTORE(); 1481} 1482 1483/* 1484 * Packet forwarding routine once entry in the cache is made 1485 */ 1486static int 1487ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif) 1488{ 1489 struct ip *ip = mtod(m, struct ip *); 1490 vifi_t vifi; 1491 int plen = ip->ip_len; 1492 1493 VIF_LOCK_ASSERT(); 1494 1495 /* 1496 * If xmt_vif is not -1, send on only the requested vif. 1497 * 1498 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1499 */ 1500 if (xmt_vif < V_numvifs) { 1501 if (V_viftable[xmt_vif].v_flags & VIFF_REGISTER) 1502 pim_register_send(ip, V_viftable + xmt_vif, m, rt); 1503 else 1504 phyint_send(ip, V_viftable + xmt_vif, m); 1505 return 1; 1506 } 1507 1508 /* 1509 * Don't forward if it didn't arrive from the parent vif for its origin. 1510 */ 1511 vifi = rt->mfc_parent; 1512 if ((vifi >= V_numvifs) || (V_viftable[vifi].v_ifp != ifp)) { 1513 CTR4(KTR_IPMF, "%s: rx on wrong ifp %p (vifi %d, v_ifp %p)", 1514 __func__, ifp, (int)vifi, V_viftable[vifi].v_ifp); 1515 MRTSTAT_INC(mrts_wrong_if); 1516 ++rt->mfc_wrong_if; 1517 /* 1518 * If we are doing PIM assert processing, send a message 1519 * to the routing daemon. 1520 * 1521 * XXX: A PIM-SM router needs the WRONGVIF detection so it 1522 * can complete the SPT switch, regardless of the type 1523 * of the iif (broadcast media, GRE tunnel, etc). 1524 */ 1525 if (V_pim_assert_enabled && (vifi < V_numvifs) && 1526 V_viftable[vifi].v_ifp) { 1527 1528 if (ifp == &V_multicast_register_if) 1529 PIMSTAT_INC(pims_rcv_registers_wrongiif); 1530 1531 /* Get vifi for the incoming packet */ 1532 for (vifi = 0; vifi < V_numvifs && V_viftable[vifi].v_ifp != ifp; 1533 vifi++) 1534 ; 1535 if (vifi >= V_numvifs) 1536 return 0; /* The iif is not found: ignore the packet. */ 1537 1538 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF) 1539 return 0; /* WRONGVIF disabled: ignore the packet */ 1540 1541 if (ratecheck(&rt->mfc_last_assert, &pim_assert_interval)) { 1542 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1543 struct igmpmsg *im; 1544 int hlen = ip->ip_hl << 2; 1545 struct mbuf *mm = m_copy(m, 0, hlen); 1546 1547 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1548 mm = m_pullup(mm, hlen); 1549 if (mm == NULL) 1550 return ENOBUFS; 1551 1552 im = mtod(mm, struct igmpmsg *); 1553 im->im_msgtype = IGMPMSG_WRONGVIF; 1554 im->im_mbz = 0; 1555 im->im_vif = vifi; 1556 1557 MRTSTAT_INC(mrts_upcalls); 1558 1559 k_igmpsrc.sin_addr = im->im_src; 1560 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) { 1561 CTR1(KTR_IPMF, "%s: socket queue full", __func__); 1562 MRTSTAT_INC(mrts_upq_sockfull); 1563 return ENOBUFS; 1564 } 1565 } 1566 } 1567 return 0; 1568 } 1569 1570 1571 /* If I sourced this packet, it counts as output, else it was input. */ 1572 if (in_hosteq(ip->ip_src, V_viftable[vifi].v_lcl_addr)) { 1573 V_viftable[vifi].v_pkt_out++; 1574 V_viftable[vifi].v_bytes_out += plen; 1575 } else { 1576 V_viftable[vifi].v_pkt_in++; 1577 V_viftable[vifi].v_bytes_in += plen; 1578 } 1579 rt->mfc_pkt_cnt++; 1580 rt->mfc_byte_cnt += plen; 1581 1582 /* 1583 * For each vif, decide if a copy of the packet should be forwarded. 1584 * Forward if: 1585 * - the ttl exceeds the vif's threshold 1586 * - there are group members downstream on interface 1587 */ 1588 for (vifi = 0; vifi < V_numvifs; vifi++) 1589 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1590 V_viftable[vifi].v_pkt_out++; 1591 V_viftable[vifi].v_bytes_out += plen; 1592 if (V_viftable[vifi].v_flags & VIFF_REGISTER) 1593 pim_register_send(ip, V_viftable + vifi, m, rt); 1594 else 1595 phyint_send(ip, V_viftable + vifi, m); 1596 } 1597 1598 /* 1599 * Perform upcall-related bw measuring. 1600 */ 1601 if (rt->mfc_bw_meter != NULL) { 1602 struct bw_meter *x; 1603 struct timeval now; 1604 1605 microtime(&now); 1606 MFC_LOCK_ASSERT(); 1607 for (x = rt->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) 1608 bw_meter_receive_packet(x, plen, &now); 1609 } 1610 1611 return 0; 1612} 1613 1614/* 1615 * Check if a vif number is legal/ok. This is used by in_mcast.c. 1616 */ 1617static int 1618X_legal_vif_num(int vif) 1619{ 1620 int ret; 1621 1622 ret = 0; 1623 if (vif < 0) 1624 return (ret); 1625 1626 VIF_LOCK(); 1627 if (vif < V_numvifs) 1628 ret = 1; 1629 VIF_UNLOCK(); 1630 1631 return (ret); 1632} 1633 1634/* 1635 * Return the local address used by this vif 1636 */ 1637static u_long 1638X_ip_mcast_src(int vifi) 1639{ 1640 in_addr_t addr; 1641 1642 addr = INADDR_ANY; 1643 if (vifi < 0) 1644 return (addr); 1645 1646 VIF_LOCK(); 1647 if (vifi < V_numvifs) 1648 addr = V_viftable[vifi].v_lcl_addr.s_addr; 1649 VIF_UNLOCK(); 1650 1651 return (addr); 1652} 1653 1654static void 1655phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1656{ 1657 struct mbuf *mb_copy; 1658 int hlen = ip->ip_hl << 2; 1659 1660 VIF_LOCK_ASSERT(); 1661 1662 /* 1663 * Make a new reference to the packet; make sure that 1664 * the IP header is actually copied, not just referenced, 1665 * so that ip_output() only scribbles on the copy. 1666 */ 1667 mb_copy = m_copypacket(m, M_DONTWAIT); 1668 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1669 mb_copy = m_pullup(mb_copy, hlen); 1670 if (mb_copy == NULL) 1671 return; 1672 1673 send_packet(vifp, mb_copy); 1674} 1675 1676static void 1677send_packet(struct vif *vifp, struct mbuf *m) 1678{ 1679 struct ip_moptions imo; 1680 struct in_multi *imm[2]; 1681 int error; 1682 1683 VIF_LOCK_ASSERT(); 1684 1685 imo.imo_multicast_ifp = vifp->v_ifp; 1686 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 1687 imo.imo_multicast_loop = 1; 1688 imo.imo_multicast_vif = -1; 1689 imo.imo_num_memberships = 0; 1690 imo.imo_max_memberships = 2; 1691 imo.imo_membership = &imm[0]; 1692 1693 /* 1694 * Re-entrancy should not be a problem here, because 1695 * the packets that we send out and are looped back at us 1696 * should get rejected because they appear to come from 1697 * the loopback interface, thus preventing looping. 1698 */ 1699 error = ip_output(m, NULL, NULL, IP_FORWARDING, &imo, NULL); 1700 CTR3(KTR_IPMF, "%s: vif %td err %d", __func__, 1701 (ptrdiff_t)(vifp - V_viftable), error); 1702} 1703 1704/* 1705 * Stubs for old RSVP socket shim implementation. 1706 */ 1707 1708static int 1709X_ip_rsvp_vif(struct socket *so __unused, struct sockopt *sopt __unused) 1710{ 1711 1712 return (EOPNOTSUPP); 1713} 1714 1715static void 1716X_ip_rsvp_force_done(struct socket *so __unused) 1717{ 1718 1719} 1720 1721static void 1722X_rsvp_input(struct mbuf *m, int off __unused) 1723{ 1724 1725 if (!V_rsvp_on) 1726 m_freem(m); 1727} 1728 1729/* 1730 * Code for bandwidth monitors 1731 */ 1732 1733/* 1734 * Define common interface for timeval-related methods 1735 */ 1736#define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp) 1737#define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp)) 1738#define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp)) 1739 1740static uint32_t 1741compute_bw_meter_flags(struct bw_upcall *req) 1742{ 1743 uint32_t flags = 0; 1744 1745 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS) 1746 flags |= BW_METER_UNIT_PACKETS; 1747 if (req->bu_flags & BW_UPCALL_UNIT_BYTES) 1748 flags |= BW_METER_UNIT_BYTES; 1749 if (req->bu_flags & BW_UPCALL_GEQ) 1750 flags |= BW_METER_GEQ; 1751 if (req->bu_flags & BW_UPCALL_LEQ) 1752 flags |= BW_METER_LEQ; 1753 1754 return flags; 1755} 1756 1757/* 1758 * Add a bw_meter entry 1759 */ 1760static int 1761add_bw_upcall(struct bw_upcall *req) 1762{ 1763 struct mfc *mfc; 1764 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC, 1765 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC }; 1766 struct timeval now; 1767 struct bw_meter *x; 1768 uint32_t flags; 1769 1770 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL)) 1771 return EOPNOTSUPP; 1772 1773 /* Test if the flags are valid */ 1774 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES))) 1775 return EINVAL; 1776 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))) 1777 return EINVAL; 1778 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 1779 == (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 1780 return EINVAL; 1781 1782 /* Test if the threshold time interval is valid */ 1783 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <)) 1784 return EINVAL; 1785 1786 flags = compute_bw_meter_flags(req); 1787 1788 /* 1789 * Find if we have already same bw_meter entry 1790 */ 1791 MFC_LOCK(); 1792 mfc = mfc_find(&req->bu_src, &req->bu_dst); 1793 if (mfc == NULL) { 1794 MFC_UNLOCK(); 1795 return EADDRNOTAVAIL; 1796 } 1797 for (x = mfc->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) { 1798 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 1799 &req->bu_threshold.b_time, ==)) && 1800 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 1801 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 1802 (x->bm_flags & BW_METER_USER_FLAGS) == flags) { 1803 MFC_UNLOCK(); 1804 return 0; /* XXX Already installed */ 1805 } 1806 } 1807 1808 /* Allocate the new bw_meter entry */ 1809 x = (struct bw_meter *)malloc(sizeof(*x), M_BWMETER, M_NOWAIT); 1810 if (x == NULL) { 1811 MFC_UNLOCK(); 1812 return ENOBUFS; 1813 } 1814 1815 /* Set the new bw_meter entry */ 1816 x->bm_threshold.b_time = req->bu_threshold.b_time; 1817 microtime(&now); 1818 x->bm_start_time = now; 1819 x->bm_threshold.b_packets = req->bu_threshold.b_packets; 1820 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes; 1821 x->bm_measured.b_packets = 0; 1822 x->bm_measured.b_bytes = 0; 1823 x->bm_flags = flags; 1824 x->bm_time_next = NULL; 1825 x->bm_time_hash = BW_METER_BUCKETS; 1826 1827 /* Add the new bw_meter entry to the front of entries for this MFC */ 1828 x->bm_mfc = mfc; 1829 x->bm_mfc_next = mfc->mfc_bw_meter; 1830 mfc->mfc_bw_meter = x; 1831 schedule_bw_meter(x, &now); 1832 MFC_UNLOCK(); 1833 1834 return 0; 1835} 1836 1837static void 1838free_bw_list(struct bw_meter *list) 1839{ 1840 while (list != NULL) { 1841 struct bw_meter *x = list; 1842 1843 list = list->bm_mfc_next; 1844 unschedule_bw_meter(x); 1845 free(x, M_BWMETER); 1846 } 1847} 1848 1849/* 1850 * Delete one or multiple bw_meter entries 1851 */ 1852static int 1853del_bw_upcall(struct bw_upcall *req) 1854{ 1855 struct mfc *mfc; 1856 struct bw_meter *x; 1857 1858 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL)) 1859 return EOPNOTSUPP; 1860 1861 MFC_LOCK(); 1862 1863 /* Find the corresponding MFC entry */ 1864 mfc = mfc_find(&req->bu_src, &req->bu_dst); 1865 if (mfc == NULL) { 1866 MFC_UNLOCK(); 1867 return EADDRNOTAVAIL; 1868 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) { 1869 /* 1870 * Delete all bw_meter entries for this mfc 1871 */ 1872 struct bw_meter *list; 1873 1874 list = mfc->mfc_bw_meter; 1875 mfc->mfc_bw_meter = NULL; 1876 free_bw_list(list); 1877 MFC_UNLOCK(); 1878 return 0; 1879 } else { /* Delete a single bw_meter entry */ 1880 struct bw_meter *prev; 1881 uint32_t flags = 0; 1882 1883 flags = compute_bw_meter_flags(req); 1884 1885 /* Find the bw_meter entry to delete */ 1886 for (prev = NULL, x = mfc->mfc_bw_meter; x != NULL; 1887 prev = x, x = x->bm_mfc_next) { 1888 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 1889 &req->bu_threshold.b_time, ==)) && 1890 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 1891 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 1892 (x->bm_flags & BW_METER_USER_FLAGS) == flags) 1893 break; 1894 } 1895 if (x != NULL) { /* Delete entry from the list for this MFC */ 1896 if (prev != NULL) 1897 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/ 1898 else 1899 x->bm_mfc->mfc_bw_meter = x->bm_mfc_next;/* new head of list */ 1900 1901 unschedule_bw_meter(x); 1902 MFC_UNLOCK(); 1903 /* Free the bw_meter entry */ 1904 free(x, M_BWMETER); 1905 return 0; 1906 } else { 1907 MFC_UNLOCK(); 1908 return EINVAL; 1909 } 1910 } 1911 /* NOTREACHED */ 1912} 1913 1914/* 1915 * Perform bandwidth measurement processing that may result in an upcall 1916 */ 1917static void 1918bw_meter_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp) 1919{ 1920 struct timeval delta; 1921 1922 MFC_LOCK_ASSERT(); 1923 1924 delta = *nowp; 1925 BW_TIMEVALDECR(&delta, &x->bm_start_time); 1926 1927 if (x->bm_flags & BW_METER_GEQ) { 1928 /* 1929 * Processing for ">=" type of bw_meter entry 1930 */ 1931 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 1932 /* Reset the bw_meter entry */ 1933 x->bm_start_time = *nowp; 1934 x->bm_measured.b_packets = 0; 1935 x->bm_measured.b_bytes = 0; 1936 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 1937 } 1938 1939 /* Record that a packet is received */ 1940 x->bm_measured.b_packets++; 1941 x->bm_measured.b_bytes += plen; 1942 1943 /* 1944 * Test if we should deliver an upcall 1945 */ 1946 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) { 1947 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 1948 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) || 1949 ((x->bm_flags & BW_METER_UNIT_BYTES) && 1950 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) { 1951 /* Prepare an upcall for delivery */ 1952 bw_meter_prepare_upcall(x, nowp); 1953 x->bm_flags |= BW_METER_UPCALL_DELIVERED; 1954 } 1955 } 1956 } else if (x->bm_flags & BW_METER_LEQ) { 1957 /* 1958 * Processing for "<=" type of bw_meter entry 1959 */ 1960 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 1961 /* 1962 * We are behind time with the multicast forwarding table 1963 * scanning for "<=" type of bw_meter entries, so test now 1964 * if we should deliver an upcall. 1965 */ 1966 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 1967 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 1968 ((x->bm_flags & BW_METER_UNIT_BYTES) && 1969 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 1970 /* Prepare an upcall for delivery */ 1971 bw_meter_prepare_upcall(x, nowp); 1972 } 1973 /* Reschedule the bw_meter entry */ 1974 unschedule_bw_meter(x); 1975 schedule_bw_meter(x, nowp); 1976 } 1977 1978 /* Record that a packet is received */ 1979 x->bm_measured.b_packets++; 1980 x->bm_measured.b_bytes += plen; 1981 1982 /* 1983 * Test if we should restart the measuring interval 1984 */ 1985 if ((x->bm_flags & BW_METER_UNIT_PACKETS && 1986 x->bm_measured.b_packets <= x->bm_threshold.b_packets) || 1987 (x->bm_flags & BW_METER_UNIT_BYTES && 1988 x->bm_measured.b_bytes <= x->bm_threshold.b_bytes)) { 1989 /* Don't restart the measuring interval */ 1990 } else { 1991 /* Do restart the measuring interval */ 1992 /* 1993 * XXX: note that we don't unschedule and schedule, because this 1994 * might be too much overhead per packet. Instead, when we process 1995 * all entries for a given timer hash bin, we check whether it is 1996 * really a timeout. If not, we reschedule at that time. 1997 */ 1998 x->bm_start_time = *nowp; 1999 x->bm_measured.b_packets = 0; 2000 x->bm_measured.b_bytes = 0; 2001 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2002 } 2003 } 2004} 2005 2006/* 2007 * Prepare a bandwidth-related upcall 2008 */ 2009static void 2010bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp) 2011{ 2012 struct timeval delta; 2013 struct bw_upcall *u; 2014 2015 MFC_LOCK_ASSERT(); 2016 2017 /* 2018 * Compute the measured time interval 2019 */ 2020 delta = *nowp; 2021 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2022 2023 /* 2024 * If there are too many pending upcalls, deliver them now 2025 */ 2026 if (V_bw_upcalls_n >= BW_UPCALLS_MAX) 2027 bw_upcalls_send(); 2028 2029 /* 2030 * Set the bw_upcall entry 2031 */ 2032 u = &V_bw_upcalls[V_bw_upcalls_n++]; 2033 u->bu_src = x->bm_mfc->mfc_origin; 2034 u->bu_dst = x->bm_mfc->mfc_mcastgrp; 2035 u->bu_threshold.b_time = x->bm_threshold.b_time; 2036 u->bu_threshold.b_packets = x->bm_threshold.b_packets; 2037 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes; 2038 u->bu_measured.b_time = delta; 2039 u->bu_measured.b_packets = x->bm_measured.b_packets; 2040 u->bu_measured.b_bytes = x->bm_measured.b_bytes; 2041 u->bu_flags = 0; 2042 if (x->bm_flags & BW_METER_UNIT_PACKETS) 2043 u->bu_flags |= BW_UPCALL_UNIT_PACKETS; 2044 if (x->bm_flags & BW_METER_UNIT_BYTES) 2045 u->bu_flags |= BW_UPCALL_UNIT_BYTES; 2046 if (x->bm_flags & BW_METER_GEQ) 2047 u->bu_flags |= BW_UPCALL_GEQ; 2048 if (x->bm_flags & BW_METER_LEQ) 2049 u->bu_flags |= BW_UPCALL_LEQ; 2050} 2051 2052/* 2053 * Send the pending bandwidth-related upcalls 2054 */ 2055static void 2056bw_upcalls_send(void) 2057{ 2058 struct mbuf *m; 2059 int len = V_bw_upcalls_n * sizeof(V_bw_upcalls[0]); 2060 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2061 static struct igmpmsg igmpmsg = { 0, /* unused1 */ 2062 0, /* unused2 */ 2063 IGMPMSG_BW_UPCALL,/* im_msgtype */ 2064 0, /* im_mbz */ 2065 0, /* im_vif */ 2066 0, /* unused3 */ 2067 { 0 }, /* im_src */ 2068 { 0 } }; /* im_dst */ 2069 2070 MFC_LOCK_ASSERT(); 2071 2072 if (V_bw_upcalls_n == 0) 2073 return; /* No pending upcalls */ 2074 2075 V_bw_upcalls_n = 0; 2076 2077 /* 2078 * Allocate a new mbuf, initialize it with the header and 2079 * the payload for the pending calls. 2080 */ 2081 MGETHDR(m, M_DONTWAIT, MT_DATA); 2082 if (m == NULL) { 2083 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n"); 2084 return; 2085 } 2086 2087 m->m_len = m->m_pkthdr.len = 0; 2088 m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg); 2089 m_copyback(m, sizeof(struct igmpmsg), len, (caddr_t)&V_bw_upcalls[0]); 2090 2091 /* 2092 * Send the upcalls 2093 * XXX do we need to set the address in k_igmpsrc ? 2094 */ 2095 MRTSTAT_INC(mrts_upcalls); 2096 if (socket_send(V_ip_mrouter, m, &k_igmpsrc) < 0) { 2097 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n"); 2098 MRTSTAT_INC(mrts_upq_sockfull); 2099 } 2100} 2101 2102/* 2103 * Compute the timeout hash value for the bw_meter entries 2104 */ 2105#define BW_METER_TIMEHASH(bw_meter, hash) \ 2106 do { \ 2107 struct timeval next_timeval = (bw_meter)->bm_start_time; \ 2108 \ 2109 BW_TIMEVALADD(&next_timeval, &(bw_meter)->bm_threshold.b_time); \ 2110 (hash) = next_timeval.tv_sec; \ 2111 if (next_timeval.tv_usec) \ 2112 (hash)++; /* XXX: make sure we don't timeout early */ \ 2113 (hash) %= BW_METER_BUCKETS; \ 2114 } while (0) 2115 2116/* 2117 * Schedule a timer to process periodically bw_meter entry of type "<=" 2118 * by linking the entry in the proper hash bucket. 2119 */ 2120static void 2121schedule_bw_meter(struct bw_meter *x, struct timeval *nowp) 2122{ 2123 int time_hash; 2124 2125 MFC_LOCK_ASSERT(); 2126 2127 if (!(x->bm_flags & BW_METER_LEQ)) 2128 return; /* XXX: we schedule timers only for "<=" entries */ 2129 2130 /* 2131 * Reset the bw_meter entry 2132 */ 2133 x->bm_start_time = *nowp; 2134 x->bm_measured.b_packets = 0; 2135 x->bm_measured.b_bytes = 0; 2136 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2137 2138 /* 2139 * Compute the timeout hash value and insert the entry 2140 */ 2141 BW_METER_TIMEHASH(x, time_hash); 2142 x->bm_time_next = V_bw_meter_timers[time_hash]; 2143 V_bw_meter_timers[time_hash] = x; 2144 x->bm_time_hash = time_hash; 2145} 2146 2147/* 2148 * Unschedule the periodic timer that processes bw_meter entry of type "<=" 2149 * by removing the entry from the proper hash bucket. 2150 */ 2151static void 2152unschedule_bw_meter(struct bw_meter *x) 2153{ 2154 int time_hash; 2155 struct bw_meter *prev, *tmp; 2156 2157 MFC_LOCK_ASSERT(); 2158 2159 if (!(x->bm_flags & BW_METER_LEQ)) 2160 return; /* XXX: we schedule timers only for "<=" entries */ 2161 2162 /* 2163 * Compute the timeout hash value and delete the entry 2164 */ 2165 time_hash = x->bm_time_hash; 2166 if (time_hash >= BW_METER_BUCKETS) 2167 return; /* Entry was not scheduled */ 2168 2169 for (prev = NULL, tmp = V_bw_meter_timers[time_hash]; 2170 tmp != NULL; prev = tmp, tmp = tmp->bm_time_next) 2171 if (tmp == x) 2172 break; 2173 2174 if (tmp == NULL) 2175 panic("unschedule_bw_meter: bw_meter entry not found"); 2176 2177 if (prev != NULL) 2178 prev->bm_time_next = x->bm_time_next; 2179 else 2180 V_bw_meter_timers[time_hash] = x->bm_time_next; 2181 2182 x->bm_time_next = NULL; 2183 x->bm_time_hash = BW_METER_BUCKETS; 2184} 2185 2186 2187/* 2188 * Process all "<=" type of bw_meter that should be processed now, 2189 * and for each entry prepare an upcall if necessary. Each processed 2190 * entry is rescheduled again for the (periodic) processing. 2191 * 2192 * This is run periodically (once per second normally). On each round, 2193 * all the potentially matching entries are in the hash slot that we are 2194 * looking at. 2195 */ 2196static void 2197bw_meter_process() 2198{ 2199 uint32_t loops; 2200 int i; 2201 struct timeval now, process_endtime; 2202 2203 microtime(&now); 2204 if (V_last_tv_sec == now.tv_sec) 2205 return; /* nothing to do */ 2206 2207 loops = now.tv_sec - V_last_tv_sec; 2208 V_last_tv_sec = now.tv_sec; 2209 if (loops > BW_METER_BUCKETS) 2210 loops = BW_METER_BUCKETS; 2211 2212 MFC_LOCK(); 2213 /* 2214 * Process all bins of bw_meter entries from the one after the last 2215 * processed to the current one. On entry, i points to the last bucket 2216 * visited, so we need to increment i at the beginning of the loop. 2217 */ 2218 for (i = (now.tv_sec - loops) % BW_METER_BUCKETS; loops > 0; loops--) { 2219 struct bw_meter *x, *tmp_list; 2220 2221 if (++i >= BW_METER_BUCKETS) 2222 i = 0; 2223 2224 /* Disconnect the list of bw_meter entries from the bin */ 2225 tmp_list = V_bw_meter_timers[i]; 2226 V_bw_meter_timers[i] = NULL; 2227 2228 /* Process the list of bw_meter entries */ 2229 while (tmp_list != NULL) { 2230 x = tmp_list; 2231 tmp_list = tmp_list->bm_time_next; 2232 2233 /* Test if the time interval is over */ 2234 process_endtime = x->bm_start_time; 2235 BW_TIMEVALADD(&process_endtime, &x->bm_threshold.b_time); 2236 if (BW_TIMEVALCMP(&process_endtime, &now, >)) { 2237 /* Not yet: reschedule, but don't reset */ 2238 int time_hash; 2239 2240 BW_METER_TIMEHASH(x, time_hash); 2241 if (time_hash == i && process_endtime.tv_sec == now.tv_sec) { 2242 /* 2243 * XXX: somehow the bin processing is a bit ahead of time. 2244 * Put the entry in the next bin. 2245 */ 2246 if (++time_hash >= BW_METER_BUCKETS) 2247 time_hash = 0; 2248 } 2249 x->bm_time_next = V_bw_meter_timers[time_hash]; 2250 V_bw_meter_timers[time_hash] = x; 2251 x->bm_time_hash = time_hash; 2252 2253 continue; 2254 } 2255 2256 /* 2257 * Test if we should deliver an upcall 2258 */ 2259 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2260 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2261 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2262 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2263 /* Prepare an upcall for delivery */ 2264 bw_meter_prepare_upcall(x, &now); 2265 } 2266 2267 /* 2268 * Reschedule for next processing 2269 */ 2270 schedule_bw_meter(x, &now); 2271 } 2272 } 2273 2274 /* Send all upcalls that are pending delivery */ 2275 bw_upcalls_send(); 2276 2277 MFC_UNLOCK(); 2278} 2279 2280/* 2281 * A periodic function for sending all upcalls that are pending delivery 2282 */ 2283static void 2284expire_bw_upcalls_send(void *arg) 2285{ 2286 CURVNET_SET((struct vnet *) arg); 2287 2288 MFC_LOCK(); 2289 bw_upcalls_send(); 2290 MFC_UNLOCK(); 2291 2292 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send, 2293 curvnet); 2294 CURVNET_RESTORE(); 2295} 2296 2297/* 2298 * A periodic function for periodic scanning of the multicast forwarding 2299 * table for processing all "<=" bw_meter entries. 2300 */ 2301static void 2302expire_bw_meter_process(void *arg) 2303{ 2304 CURVNET_SET((struct vnet *) arg); 2305 2306 if (V_mrt_api_config & MRT_MFC_BW_UPCALL) 2307 bw_meter_process(); 2308 2309 callout_reset(&V_bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, 2310 curvnet); 2311 CURVNET_RESTORE(); 2312} 2313 2314/* 2315 * End of bandwidth monitoring code 2316 */ 2317 2318/* 2319 * Send the packet up to the user daemon, or eventually do kernel encapsulation 2320 * 2321 */ 2322static int 2323pim_register_send(struct ip *ip, struct vif *vifp, struct mbuf *m, 2324 struct mfc *rt) 2325{ 2326 struct mbuf *mb_copy, *mm; 2327 2328 /* 2329 * Do not send IGMP_WHOLEPKT notifications to userland, if the 2330 * rendezvous point was unspecified, and we were told not to. 2331 */ 2332 if (pim_squelch_wholepkt != 0 && (V_mrt_api_config & MRT_MFC_RP) && 2333 in_nullhost(rt->mfc_rp)) 2334 return 0; 2335 2336 mb_copy = pim_register_prepare(ip, m); 2337 if (mb_copy == NULL) 2338 return ENOBUFS; 2339 2340 /* 2341 * Send all the fragments. Note that the mbuf for each fragment 2342 * is freed by the sending machinery. 2343 */ 2344 for (mm = mb_copy; mm; mm = mb_copy) { 2345 mb_copy = mm->m_nextpkt; 2346 mm->m_nextpkt = 0; 2347 mm = m_pullup(mm, sizeof(struct ip)); 2348 if (mm != NULL) { 2349 ip = mtod(mm, struct ip *); 2350 if ((V_mrt_api_config & MRT_MFC_RP) && !in_nullhost(rt->mfc_rp)) { 2351 pim_register_send_rp(ip, vifp, mm, rt); 2352 } else { 2353 pim_register_send_upcall(ip, vifp, mm, rt); 2354 } 2355 } 2356 } 2357 2358 return 0; 2359} 2360 2361/* 2362 * Return a copy of the data packet that is ready for PIM Register 2363 * encapsulation. 2364 * XXX: Note that in the returned copy the IP header is a valid one. 2365 */ 2366static struct mbuf * 2367pim_register_prepare(struct ip *ip, struct mbuf *m) 2368{ 2369 struct mbuf *mb_copy = NULL; 2370 int mtu; 2371 2372 /* Take care of delayed checksums */ 2373 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 2374 in_delayed_cksum(m); 2375 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 2376 } 2377 2378 /* 2379 * Copy the old packet & pullup its IP header into the 2380 * new mbuf so we can modify it. 2381 */ 2382 mb_copy = m_copypacket(m, M_DONTWAIT); 2383 if (mb_copy == NULL) 2384 return NULL; 2385 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2); 2386 if (mb_copy == NULL) 2387 return NULL; 2388 2389 /* take care of the TTL */ 2390 ip = mtod(mb_copy, struct ip *); 2391 --ip->ip_ttl; 2392 2393 /* Compute the MTU after the PIM Register encapsulation */ 2394 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr); 2395 2396 if (ip->ip_len <= mtu) { 2397 /* Turn the IP header into a valid one */ 2398 ip->ip_len = htons(ip->ip_len); 2399 ip->ip_off = htons(ip->ip_off); 2400 ip->ip_sum = 0; 2401 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 2402 } else { 2403 /* Fragment the packet */ 2404 if (ip_fragment(ip, &mb_copy, mtu, 0, CSUM_DELAY_IP) != 0) { 2405 m_freem(mb_copy); 2406 return NULL; 2407 } 2408 } 2409 return mb_copy; 2410} 2411 2412/* 2413 * Send an upcall with the data packet to the user-level process. 2414 */ 2415static int 2416pim_register_send_upcall(struct ip *ip, struct vif *vifp, 2417 struct mbuf *mb_copy, struct mfc *rt) 2418{ 2419 struct mbuf *mb_first; 2420 int len = ntohs(ip->ip_len); 2421 struct igmpmsg *im; 2422 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2423 2424 VIF_LOCK_ASSERT(); 2425 2426 /* 2427 * Add a new mbuf with an upcall header 2428 */ 2429 MGETHDR(mb_first, M_DONTWAIT, MT_DATA); 2430 if (mb_first == NULL) { 2431 m_freem(mb_copy); 2432 return ENOBUFS; 2433 } 2434 mb_first->m_data += max_linkhdr; 2435 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg); 2436 mb_first->m_len = sizeof(struct igmpmsg); 2437 mb_first->m_next = mb_copy; 2438 2439 /* Send message to routing daemon */ 2440 im = mtod(mb_first, struct igmpmsg *); 2441 im->im_msgtype = IGMPMSG_WHOLEPKT; 2442 im->im_mbz = 0; 2443 im->im_vif = vifp - V_viftable; 2444 im->im_src = ip->ip_src; 2445 im->im_dst = ip->ip_dst; 2446 2447 k_igmpsrc.sin_addr = ip->ip_src; 2448 2449 MRTSTAT_INC(mrts_upcalls); 2450 2451 if (socket_send(V_ip_mrouter, mb_first, &k_igmpsrc) < 0) { 2452 CTR1(KTR_IPMF, "%s: socket queue full", __func__); 2453 MRTSTAT_INC(mrts_upq_sockfull); 2454 return ENOBUFS; 2455 } 2456 2457 /* Keep statistics */ 2458 PIMSTAT_INC(pims_snd_registers_msgs); 2459 PIMSTAT_ADD(pims_snd_registers_bytes, len); 2460 2461 return 0; 2462} 2463 2464/* 2465 * Encapsulate the data packet in PIM Register message and send it to the RP. 2466 */ 2467static int 2468pim_register_send_rp(struct ip *ip, struct vif *vifp, struct mbuf *mb_copy, 2469 struct mfc *rt) 2470{ 2471 struct mbuf *mb_first; 2472 struct ip *ip_outer; 2473 struct pim_encap_pimhdr *pimhdr; 2474 int len = ntohs(ip->ip_len); 2475 vifi_t vifi = rt->mfc_parent; 2476 2477 VIF_LOCK_ASSERT(); 2478 2479 if ((vifi >= V_numvifs) || in_nullhost(V_viftable[vifi].v_lcl_addr)) { 2480 m_freem(mb_copy); 2481 return EADDRNOTAVAIL; /* The iif vif is invalid */ 2482 } 2483 2484 /* 2485 * Add a new mbuf with the encapsulating header 2486 */ 2487 MGETHDR(mb_first, M_DONTWAIT, MT_DATA); 2488 if (mb_first == NULL) { 2489 m_freem(mb_copy); 2490 return ENOBUFS; 2491 } 2492 mb_first->m_data += max_linkhdr; 2493 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 2494 mb_first->m_next = mb_copy; 2495 2496 mb_first->m_pkthdr.len = len + mb_first->m_len; 2497 2498 /* 2499 * Fill in the encapsulating IP and PIM header 2500 */ 2501 ip_outer = mtod(mb_first, struct ip *); 2502 *ip_outer = pim_encap_iphdr; 2503 ip_outer->ip_id = ip_newid(); 2504 ip_outer->ip_len = len + sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 2505 ip_outer->ip_src = V_viftable[vifi].v_lcl_addr; 2506 ip_outer->ip_dst = rt->mfc_rp; 2507 /* 2508 * Copy the inner header TOS to the outer header, and take care of the 2509 * IP_DF bit. 2510 */ 2511 ip_outer->ip_tos = ip->ip_tos; 2512 if (ntohs(ip->ip_off) & IP_DF) 2513 ip_outer->ip_off |= IP_DF; 2514 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer 2515 + sizeof(pim_encap_iphdr)); 2516 *pimhdr = pim_encap_pimhdr; 2517 /* If the iif crosses a border, set the Border-bit */ 2518 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & V_mrt_api_config) 2519 pimhdr->flags |= htonl(PIM_BORDER_REGISTER); 2520 2521 mb_first->m_data += sizeof(pim_encap_iphdr); 2522 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr)); 2523 mb_first->m_data -= sizeof(pim_encap_iphdr); 2524 2525 send_packet(vifp, mb_first); 2526 2527 /* Keep statistics */ 2528 PIMSTAT_INC(pims_snd_registers_msgs); 2529 PIMSTAT_ADD(pims_snd_registers_bytes, len); 2530 2531 return 0; 2532} 2533 2534/* 2535 * pim_encapcheck() is called by the encap4_input() path at runtime to 2536 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 2537 * into the kernel. 2538 */ 2539static int 2540pim_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 2541{ 2542 2543#ifdef DIAGNOSTIC 2544 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 2545#endif 2546 if (proto != IPPROTO_PIM) 2547 return 0; /* not for us; reject the datagram. */ 2548 2549 return 64; /* claim the datagram. */ 2550} 2551 2552/* 2553 * PIM-SMv2 and PIM-DM messages processing. 2554 * Receives and verifies the PIM control messages, and passes them 2555 * up to the listening socket, using rip_input(). 2556 * The only message with special processing is the PIM_REGISTER message 2557 * (used by PIM-SM): the PIM header is stripped off, and the inner packet 2558 * is passed to if_simloop(). 2559 */ 2560void 2561pim_input(struct mbuf *m, int off) 2562{ 2563 struct ip *ip = mtod(m, struct ip *); 2564 struct pim *pim; 2565 int minlen; 2566 int datalen = ip->ip_len; 2567 int ip_tos; 2568 int iphlen = off; 2569 2570 /* Keep statistics */ 2571 PIMSTAT_INC(pims_rcv_total_msgs); 2572 PIMSTAT_ADD(pims_rcv_total_bytes, datalen); 2573 2574 /* 2575 * Validate lengths 2576 */ 2577 if (datalen < PIM_MINLEN) { 2578 PIMSTAT_INC(pims_rcv_tooshort); 2579 CTR3(KTR_IPMF, "%s: short packet (%d) from %s", 2580 __func__, datalen, inet_ntoa(ip->ip_src)); 2581 m_freem(m); 2582 return; 2583 } 2584 2585 /* 2586 * If the packet is at least as big as a REGISTER, go agead 2587 * and grab the PIM REGISTER header size, to avoid another 2588 * possible m_pullup() later. 2589 * 2590 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8 2591 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28 2592 */ 2593 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN); 2594 /* 2595 * Get the IP and PIM headers in contiguous memory, and 2596 * possibly the PIM REGISTER header. 2597 */ 2598 if ((m->m_flags & M_EXT || m->m_len < minlen) && 2599 (m = m_pullup(m, minlen)) == 0) { 2600 CTR1(KTR_IPMF, "%s: m_pullup() failed", __func__); 2601 return; 2602 } 2603 2604 /* m_pullup() may have given us a new mbuf so reset ip. */ 2605 ip = mtod(m, struct ip *); 2606 ip_tos = ip->ip_tos; 2607 2608 /* adjust mbuf to point to the PIM header */ 2609 m->m_data += iphlen; 2610 m->m_len -= iphlen; 2611 pim = mtod(m, struct pim *); 2612 2613 /* 2614 * Validate checksum. If PIM REGISTER, exclude the data packet. 2615 * 2616 * XXX: some older PIMv2 implementations don't make this distinction, 2617 * so for compatibility reason perform the checksum over part of the 2618 * message, and if error, then over the whole message. 2619 */ 2620 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) { 2621 /* do nothing, checksum okay */ 2622 } else if (in_cksum(m, datalen)) { 2623 PIMSTAT_INC(pims_rcv_badsum); 2624 CTR1(KTR_IPMF, "%s: invalid checksum", __func__); 2625 m_freem(m); 2626 return; 2627 } 2628 2629 /* PIM version check */ 2630 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) { 2631 PIMSTAT_INC(pims_rcv_badversion); 2632 CTR3(KTR_IPMF, "%s: bad version %d expect %d", __func__, 2633 (int)PIM_VT_V(pim->pim_vt), PIM_VERSION); 2634 m_freem(m); 2635 return; 2636 } 2637 2638 /* restore mbuf back to the outer IP */ 2639 m->m_data -= iphlen; 2640 m->m_len += iphlen; 2641 2642 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) { 2643 /* 2644 * Since this is a REGISTER, we'll make a copy of the register 2645 * headers ip + pim + u_int32 + encap_ip, to be passed up to the 2646 * routing daemon. 2647 */ 2648 struct sockaddr_in dst = { sizeof(dst), AF_INET }; 2649 struct mbuf *mcp; 2650 struct ip *encap_ip; 2651 u_int32_t *reghdr; 2652 struct ifnet *vifp; 2653 2654 VIF_LOCK(); 2655 if ((V_reg_vif_num >= V_numvifs) || (V_reg_vif_num == VIFI_INVALID)) { 2656 VIF_UNLOCK(); 2657 CTR2(KTR_IPMF, "%s: register vif not set: %d", __func__, 2658 (int)V_reg_vif_num); 2659 m_freem(m); 2660 return; 2661 } 2662 /* XXX need refcnt? */ 2663 vifp = V_viftable[V_reg_vif_num].v_ifp; 2664 VIF_UNLOCK(); 2665 2666 /* 2667 * Validate length 2668 */ 2669 if (datalen < PIM_REG_MINLEN) { 2670 PIMSTAT_INC(pims_rcv_tooshort); 2671 PIMSTAT_INC(pims_rcv_badregisters); 2672 CTR1(KTR_IPMF, "%s: register packet size too small", __func__); 2673 m_freem(m); 2674 return; 2675 } 2676 2677 reghdr = (u_int32_t *)(pim + 1); 2678 encap_ip = (struct ip *)(reghdr + 1); 2679 2680 CTR3(KTR_IPMF, "%s: register: encap ip src %s len %d", 2681 __func__, inet_ntoa(encap_ip->ip_src), ntohs(encap_ip->ip_len)); 2682 2683 /* verify the version number of the inner packet */ 2684 if (encap_ip->ip_v != IPVERSION) { 2685 PIMSTAT_INC(pims_rcv_badregisters); 2686 CTR1(KTR_IPMF, "%s: bad encap ip version", __func__); 2687 m_freem(m); 2688 return; 2689 } 2690 2691 /* verify the inner packet is destined to a mcast group */ 2692 if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) { 2693 PIMSTAT_INC(pims_rcv_badregisters); 2694 CTR2(KTR_IPMF, "%s: bad encap ip dest %s", __func__, 2695 inet_ntoa(encap_ip->ip_dst)); 2696 m_freem(m); 2697 return; 2698 } 2699 2700 /* If a NULL_REGISTER, pass it to the daemon */ 2701 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 2702 goto pim_input_to_daemon; 2703 2704 /* 2705 * Copy the TOS from the outer IP header to the inner IP header. 2706 */ 2707 if (encap_ip->ip_tos != ip_tos) { 2708 /* Outer TOS -> inner TOS */ 2709 encap_ip->ip_tos = ip_tos; 2710 /* Recompute the inner header checksum. Sigh... */ 2711 2712 /* adjust mbuf to point to the inner IP header */ 2713 m->m_data += (iphlen + PIM_MINLEN); 2714 m->m_len -= (iphlen + PIM_MINLEN); 2715 2716 encap_ip->ip_sum = 0; 2717 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2); 2718 2719 /* restore mbuf to point back to the outer IP header */ 2720 m->m_data -= (iphlen + PIM_MINLEN); 2721 m->m_len += (iphlen + PIM_MINLEN); 2722 } 2723 2724 /* 2725 * Decapsulate the inner IP packet and loopback to forward it 2726 * as a normal multicast packet. Also, make a copy of the 2727 * outer_iphdr + pimhdr + reghdr + encap_iphdr 2728 * to pass to the daemon later, so it can take the appropriate 2729 * actions (e.g., send back PIM_REGISTER_STOP). 2730 * XXX: here m->m_data points to the outer IP header. 2731 */ 2732 mcp = m_copy(m, 0, iphlen + PIM_REG_MINLEN); 2733 if (mcp == NULL) { 2734 CTR1(KTR_IPMF, "%s: m_copy() failed", __func__); 2735 m_freem(m); 2736 return; 2737 } 2738 2739 /* Keep statistics */ 2740 /* XXX: registers_bytes include only the encap. mcast pkt */ 2741 PIMSTAT_INC(pims_rcv_registers_msgs); 2742 PIMSTAT_ADD(pims_rcv_registers_bytes, ntohs(encap_ip->ip_len)); 2743 2744 /* 2745 * forward the inner ip packet; point m_data at the inner ip. 2746 */ 2747 m_adj(m, iphlen + PIM_MINLEN); 2748 2749 CTR4(KTR_IPMF, 2750 "%s: forward decap'd REGISTER: src %lx dst %lx vif %d", 2751 __func__, 2752 (u_long)ntohl(encap_ip->ip_src.s_addr), 2753 (u_long)ntohl(encap_ip->ip_dst.s_addr), 2754 (int)V_reg_vif_num); 2755 2756 /* NB: vifp was collected above; can it change on us? */ 2757 if_simloop(vifp, m, dst.sin_family, 0); 2758 2759 /* prepare the register head to send to the mrouting daemon */ 2760 m = mcp; 2761 } 2762 2763pim_input_to_daemon: 2764 /* 2765 * Pass the PIM message up to the daemon; if it is a Register message, 2766 * pass the 'head' only up to the daemon. This includes the 2767 * outer IP header, PIM header, PIM-Register header and the 2768 * inner IP header. 2769 * XXX: the outer IP header pkt size of a Register is not adjust to 2770 * reflect the fact that the inner multicast data is truncated. 2771 */ 2772 rip_input(m, iphlen); 2773 2774 return; 2775} 2776 2777static int 2778sysctl_mfctable(SYSCTL_HANDLER_ARGS) 2779{ 2780 struct mfc *rt; 2781 int error, i; 2782 2783 if (req->newptr) 2784 return (EPERM); 2785 if (V_mfchashtbl == NULL) /* XXX unlocked */ 2786 return (0); 2787 error = sysctl_wire_old_buffer(req, 0); 2788 if (error) 2789 return (error); 2790 2791 MFC_LOCK(); 2792 for (i = 0; i < mfchashsize; i++) { 2793 LIST_FOREACH(rt, &V_mfchashtbl[i], mfc_hash) { 2794 error = SYSCTL_OUT(req, rt, sizeof(struct mfc)); 2795 if (error) 2796 goto out_locked; 2797 } 2798 } 2799out_locked: 2800 MFC_UNLOCK(); 2801 return (error); 2802} 2803 2804static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mfctable, CTLFLAG_RD, 2805 sysctl_mfctable, "IPv4 Multicast Forwarding Table " 2806 "(struct *mfc[mfchashsize], netinet/ip_mroute.h)"); 2807 2808static void 2809vnet_mroute_init(const void *unused __unused) 2810{ 2811 2812 MALLOC(V_nexpire, u_char *, mfchashsize, M_MRTABLE, M_WAITOK|M_ZERO); 2813 bzero(V_bw_meter_timers, sizeof(V_bw_meter_timers)); 2814 callout_init(&V_expire_upcalls_ch, CALLOUT_MPSAFE); 2815 callout_init(&V_bw_upcalls_ch, CALLOUT_MPSAFE); 2816 callout_init(&V_bw_meter_ch, CALLOUT_MPSAFE); 2817} 2818 2819VNET_SYSINIT(vnet_mroute_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mroute_init, 2820 NULL); 2821 2822static void 2823vnet_mroute_uninit(const void *unused __unused) 2824{ 2825 2826 FREE(V_nexpire, M_MRTABLE); 2827 V_nexpire = NULL; 2828} 2829 2830VNET_SYSUNINIT(vnet_mroute_uninit, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, 2831 vnet_mroute_uninit, NULL); 2832 2833static int 2834ip_mroute_modevent(module_t mod, int type, void *unused) 2835{ 2836 2837 switch (type) { 2838 case MOD_LOAD: 2839 MROUTER_LOCK_INIT(); 2840 2841 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2842 if_detached_event, NULL, EVENTHANDLER_PRI_ANY); 2843 if (if_detach_event_tag == NULL) { 2844 printf("ip_mroute: unable to register " 2845 "ifnet_departure_event handler\n"); 2846 MROUTER_LOCK_DESTROY(); 2847 return (EINVAL); 2848 } 2849 2850 MFC_LOCK_INIT(); 2851 VIF_LOCK_INIT(); 2852 2853 mfchashsize = MFCHASHSIZE; 2854 if (TUNABLE_ULONG_FETCH("net.inet.ip.mfchashsize", &mfchashsize) && 2855 !powerof2(mfchashsize)) { 2856 printf("WARNING: %s not a power of 2; using default\n", 2857 "net.inet.ip.mfchashsize"); 2858 mfchashsize = MFCHASHSIZE; 2859 } 2860 2861 pim_squelch_wholepkt = 0; 2862 TUNABLE_ULONG_FETCH("net.inet.pim.squelch_wholepkt", 2863 &pim_squelch_wholepkt); 2864 2865 pim_encap_cookie = encap_attach_func(AF_INET, IPPROTO_PIM, 2866 pim_encapcheck, &in_pim_protosw, NULL); 2867 if (pim_encap_cookie == NULL) { 2868 printf("ip_mroute: unable to attach pim encap\n"); 2869 VIF_LOCK_DESTROY(); 2870 MFC_LOCK_DESTROY(); 2871 MROUTER_LOCK_DESTROY(); 2872 return (EINVAL); 2873 } 2874 2875 ip_mcast_src = X_ip_mcast_src; 2876 ip_mforward = X_ip_mforward; 2877 ip_mrouter_done = X_ip_mrouter_done; 2878 ip_mrouter_get = X_ip_mrouter_get; 2879 ip_mrouter_set = X_ip_mrouter_set; 2880 2881 ip_rsvp_force_done = X_ip_rsvp_force_done; 2882 ip_rsvp_vif = X_ip_rsvp_vif; 2883 2884 legal_vif_num = X_legal_vif_num; 2885 mrt_ioctl = X_mrt_ioctl; 2886 rsvp_input_p = X_rsvp_input; 2887 break; 2888 2889 case MOD_UNLOAD: 2890 /* 2891 * Typically module unload happens after the user-level 2892 * process has shutdown the kernel services (the check 2893 * below insures someone can't just yank the module out 2894 * from under a running process). But if the module is 2895 * just loaded and then unloaded w/o starting up a user 2896 * process we still need to cleanup. 2897 */ 2898 MROUTER_LOCK(); 2899 if (ip_mrouter_cnt != 0) { 2900 MROUTER_UNLOCK(); 2901 return (EINVAL); 2902 } 2903 ip_mrouter_unloading = 1; 2904 MROUTER_UNLOCK(); 2905 2906 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2907 2908 if (pim_encap_cookie) { 2909 encap_detach(pim_encap_cookie); 2910 pim_encap_cookie = NULL; 2911 } 2912 2913 ip_mcast_src = NULL; 2914 ip_mforward = NULL; 2915 ip_mrouter_done = NULL; 2916 ip_mrouter_get = NULL; 2917 ip_mrouter_set = NULL; 2918 2919 ip_rsvp_force_done = NULL; 2920 ip_rsvp_vif = NULL; 2921 2922 legal_vif_num = NULL; 2923 mrt_ioctl = NULL; 2924 rsvp_input_p = NULL; 2925 2926 VIF_LOCK_DESTROY(); 2927 MFC_LOCK_DESTROY(); 2928 MROUTER_LOCK_DESTROY(); 2929 break; 2930 2931 default: 2932 return EOPNOTSUPP; 2933 } 2934 return 0; 2935} 2936 2937static moduledata_t ip_mroutemod = { 2938 "ip_mroute", 2939 ip_mroute_modevent, 2940 0 2941}; 2942 2943DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE); 2944