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: stable/10/sys/netinet/ip_mroute.c 314667 2017-03-04 13:03:31Z avg $"); 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#include <sys/counter.h> 97 98#include <net/if.h> 99#include <net/netisr.h> 100#include <net/route.h> 101#include <net/vnet.h> 102 103#include <netinet/in.h> 104#include <netinet/igmp.h> 105#include <netinet/in_systm.h> 106#include <netinet/in_var.h> 107#include <netinet/ip.h> 108#include <netinet/ip_encap.h> 109#include <netinet/ip_mroute.h> 110#include <netinet/ip_var.h> 111#include <netinet/ip_options.h> 112#include <netinet/pim.h> 113#include <netinet/pim_var.h> 114#include <netinet/udp.h> 115 116#include <machine/in_cksum.h> 117 118#ifndef KTR_IPMF 119#define KTR_IPMF KTR_INET 120#endif 121 122#define VIFI_INVALID ((vifi_t) -1) 123#define M_HASCL(m) ((m)->m_flags & M_EXT) 124 125static VNET_DEFINE(uint32_t, last_tv_sec); /* last time we processed this */ 126#define V_last_tv_sec VNET(last_tv_sec) 127 128static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast forwarding cache"); 129 130/* 131 * Locking. We use two locks: one for the virtual interface table and 132 * one for the forwarding table. These locks may be nested in which case 133 * the VIF lock must always be taken first. Note that each lock is used 134 * to cover not only the specific data structure but also related data 135 * structures. 136 */ 137 138static struct mtx mrouter_mtx; 139#define MROUTER_LOCK() mtx_lock(&mrouter_mtx) 140#define MROUTER_UNLOCK() mtx_unlock(&mrouter_mtx) 141#define MROUTER_LOCK_ASSERT() mtx_assert(&mrouter_mtx, MA_OWNED) 142#define MROUTER_LOCK_INIT() \ 143 mtx_init(&mrouter_mtx, "IPv4 multicast forwarding", NULL, MTX_DEF) 144#define MROUTER_LOCK_DESTROY() mtx_destroy(&mrouter_mtx) 145 146static int ip_mrouter_cnt; /* # of vnets with active mrouters */ 147static int ip_mrouter_unloading; /* Allow no more V_ip_mrouter sockets */ 148 149static VNET_PCPUSTAT_DEFINE(struct mrtstat, mrtstat); 150VNET_PCPUSTAT_SYSINIT(mrtstat); 151VNET_PCPUSTAT_SYSUNINIT(mrtstat); 152SYSCTL_VNET_PCPUSTAT(_net_inet_ip, OID_AUTO, mrtstat, struct mrtstat, 153 mrtstat, "IPv4 Multicast Forwarding Statistics (struct mrtstat, " 154 "netinet/ip_mroute.h)"); 155 156static VNET_DEFINE(u_long, mfchash); 157#define V_mfchash VNET(mfchash) 158#define MFCHASH(a, g) \ 159 ((((a).s_addr >> 20) ^ ((a).s_addr >> 10) ^ (a).s_addr ^ \ 160 ((g).s_addr >> 20) ^ ((g).s_addr >> 10) ^ (g).s_addr) & V_mfchash) 161#define MFCHASHSIZE 256 162 163static u_long mfchashsize; /* Hash size */ 164static VNET_DEFINE(u_char *, nexpire); /* 0..mfchashsize-1 */ 165#define V_nexpire VNET(nexpire) 166static VNET_DEFINE(LIST_HEAD(mfchashhdr, mfc)*, mfchashtbl); 167#define V_mfchashtbl VNET(mfchashtbl) 168 169static struct mtx mfc_mtx; 170#define MFC_LOCK() mtx_lock(&mfc_mtx) 171#define MFC_UNLOCK() mtx_unlock(&mfc_mtx) 172#define MFC_LOCK_ASSERT() mtx_assert(&mfc_mtx, MA_OWNED) 173#define MFC_LOCK_INIT() \ 174 mtx_init(&mfc_mtx, "IPv4 multicast forwarding cache", NULL, MTX_DEF) 175#define MFC_LOCK_DESTROY() mtx_destroy(&mfc_mtx) 176 177static VNET_DEFINE(vifi_t, numvifs); 178#define V_numvifs VNET(numvifs) 179static VNET_DEFINE(struct vif, viftable[MAXVIFS]); 180#define V_viftable VNET(viftable) 181SYSCTL_VNET_OPAQUE(_net_inet_ip, OID_AUTO, viftable, CTLFLAG_RD, 182 &VNET_NAME(viftable), sizeof(V_viftable), "S,vif[MAXVIFS]", 183 "IPv4 Multicast Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)"); 184 185static struct mtx vif_mtx; 186#define VIF_LOCK() mtx_lock(&vif_mtx) 187#define VIF_UNLOCK() mtx_unlock(&vif_mtx) 188#define VIF_LOCK_ASSERT() mtx_assert(&vif_mtx, MA_OWNED) 189#define VIF_LOCK_INIT() \ 190 mtx_init(&vif_mtx, "IPv4 multicast interfaces", NULL, MTX_DEF) 191#define VIF_LOCK_DESTROY() mtx_destroy(&vif_mtx) 192 193static eventhandler_tag if_detach_event_tag = NULL; 194 195static VNET_DEFINE(struct callout, expire_upcalls_ch); 196#define V_expire_upcalls_ch VNET(expire_upcalls_ch) 197 198#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 199#define UPCALL_EXPIRE 6 /* number of timeouts */ 200 201/* 202 * Bandwidth meter variables and constants 203 */ 204static MALLOC_DEFINE(M_BWMETER, "bwmeter", "multicast upcall bw meters"); 205/* 206 * Pending timeouts are stored in a hash table, the key being the 207 * expiration time. Periodically, the entries are analysed and processed. 208 */ 209#define BW_METER_BUCKETS 1024 210static VNET_DEFINE(struct bw_meter*, bw_meter_timers[BW_METER_BUCKETS]); 211#define V_bw_meter_timers VNET(bw_meter_timers) 212static VNET_DEFINE(struct callout, bw_meter_ch); 213#define V_bw_meter_ch VNET(bw_meter_ch) 214#define BW_METER_PERIOD (hz) /* periodical handling of bw meters */ 215 216/* 217 * Pending upcalls are stored in a vector which is flushed when 218 * full, or periodically 219 */ 220static VNET_DEFINE(struct bw_upcall, bw_upcalls[BW_UPCALLS_MAX]); 221#define V_bw_upcalls VNET(bw_upcalls) 222static VNET_DEFINE(u_int, bw_upcalls_n); /* # of pending upcalls */ 223#define V_bw_upcalls_n VNET(bw_upcalls_n) 224static VNET_DEFINE(struct callout, bw_upcalls_ch); 225#define V_bw_upcalls_ch VNET(bw_upcalls_ch) 226 227#define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */ 228 229static VNET_PCPUSTAT_DEFINE(struct pimstat, pimstat); 230VNET_PCPUSTAT_SYSINIT(pimstat); 231VNET_PCPUSTAT_SYSUNINIT(pimstat); 232 233SYSCTL_NODE(_net_inet, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 234SYSCTL_VNET_PCPUSTAT(_net_inet_pim, PIMCTL_STATS, stats, struct pimstat, 235 pimstat, "PIM Statistics (struct pimstat, netinet/pim_var.h)"); 236 237static u_long pim_squelch_wholepkt = 0; 238SYSCTL_ULONG(_net_inet_pim, OID_AUTO, squelch_wholepkt, CTLFLAG_RW, 239 &pim_squelch_wholepkt, 0, 240 "Disable IGMP_WHOLEPKT notifications if rendezvous point is unspecified"); 241 242extern struct domain inetdomain; 243static const struct protosw in_pim_protosw = { 244 .pr_type = SOCK_RAW, 245 .pr_domain = &inetdomain, 246 .pr_protocol = IPPROTO_PIM, 247 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 248 .pr_input = pim_input, 249 .pr_output = (pr_output_t*)rip_output, 250 .pr_ctloutput = rip_ctloutput, 251 .pr_usrreqs = &rip_usrreqs 252}; 253static const struct encaptab *pim_encap_cookie; 254 255static int pim_encapcheck(const struct mbuf *, int, int, void *); 256 257/* 258 * Note: the PIM Register encapsulation adds the following in front of a 259 * data packet: 260 * 261 * struct pim_encap_hdr { 262 * struct ip ip; 263 * struct pim_encap_pimhdr pim; 264 * } 265 * 266 */ 267 268struct pim_encap_pimhdr { 269 struct pim pim; 270 uint32_t flags; 271}; 272#define PIM_ENCAP_TTL 64 273 274static struct ip pim_encap_iphdr = { 275#if BYTE_ORDER == LITTLE_ENDIAN 276 sizeof(struct ip) >> 2, 277 IPVERSION, 278#else 279 IPVERSION, 280 sizeof(struct ip) >> 2, 281#endif 282 0, /* tos */ 283 sizeof(struct ip), /* total length */ 284 0, /* id */ 285 0, /* frag offset */ 286 PIM_ENCAP_TTL, 287 IPPROTO_PIM, 288 0, /* checksum */ 289}; 290 291static struct pim_encap_pimhdr pim_encap_pimhdr = { 292 { 293 PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */ 294 0, /* reserved */ 295 0, /* checksum */ 296 }, 297 0 /* flags */ 298}; 299 300static VNET_DEFINE(vifi_t, reg_vif_num) = VIFI_INVALID; 301#define V_reg_vif_num VNET(reg_vif_num) 302static VNET_DEFINE(struct ifnet, multicast_register_if); 303#define V_multicast_register_if VNET(multicast_register_if) 304 305/* 306 * Private variables. 307 */ 308 309static u_long X_ip_mcast_src(int); 310static int X_ip_mforward(struct ip *, struct ifnet *, struct mbuf *, 311 struct ip_moptions *); 312static int X_ip_mrouter_done(void); 313static int X_ip_mrouter_get(struct socket *, struct sockopt *); 314static int X_ip_mrouter_set(struct socket *, struct sockopt *); 315static int X_legal_vif_num(int); 316static int X_mrt_ioctl(u_long, caddr_t, int); 317 318static int add_bw_upcall(struct bw_upcall *); 319static int add_mfc(struct mfcctl2 *); 320static int add_vif(struct vifctl *); 321static void bw_meter_prepare_upcall(struct bw_meter *, struct timeval *); 322static void bw_meter_process(void); 323static void bw_meter_receive_packet(struct bw_meter *, int, 324 struct timeval *); 325static void bw_upcalls_send(void); 326static int del_bw_upcall(struct bw_upcall *); 327static int del_mfc(struct mfcctl2 *); 328static int del_vif(vifi_t); 329static int del_vif_locked(vifi_t); 330static void expire_bw_meter_process(void *); 331static void expire_bw_upcalls_send(void *); 332static void expire_mfc(struct mfc *); 333static void expire_upcalls(void *); 334static void free_bw_list(struct bw_meter *); 335static int get_sg_cnt(struct sioc_sg_req *); 336static int get_vif_cnt(struct sioc_vif_req *); 337static void if_detached_event(void *, struct ifnet *); 338static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t); 339static int ip_mrouter_init(struct socket *, int); 340static __inline struct mfc * 341 mfc_find(struct in_addr *, struct in_addr *); 342static void phyint_send(struct ip *, struct vif *, struct mbuf *); 343static struct mbuf * 344 pim_register_prepare(struct ip *, struct mbuf *); 345static int pim_register_send(struct ip *, struct vif *, 346 struct mbuf *, struct mfc *); 347static int pim_register_send_rp(struct ip *, struct vif *, 348 struct mbuf *, struct mfc *); 349static int pim_register_send_upcall(struct ip *, struct vif *, 350 struct mbuf *, struct mfc *); 351static void schedule_bw_meter(struct bw_meter *, struct timeval *); 352static void send_packet(struct vif *, struct mbuf *); 353static int set_api_config(uint32_t *); 354static int set_assert(int); 355static int socket_send(struct socket *, struct mbuf *, 356 struct sockaddr_in *); 357static void unschedule_bw_meter(struct bw_meter *); 358 359/* 360 * Kernel multicast forwarding API capabilities and setup. 361 * If more API capabilities are added to the kernel, they should be 362 * recorded in `mrt_api_support'. 363 */ 364#define MRT_API_VERSION 0x0305 365 366static const int mrt_api_version = MRT_API_VERSION; 367static const uint32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF | 368 MRT_MFC_FLAGS_BORDER_VIF | 369 MRT_MFC_RP | 370 MRT_MFC_BW_UPCALL); 371static VNET_DEFINE(uint32_t, mrt_api_config); 372#define V_mrt_api_config VNET(mrt_api_config) 373static VNET_DEFINE(int, pim_assert_enabled); 374#define V_pim_assert_enabled VNET(pim_assert_enabled) 375static struct timeval pim_assert_interval = { 3, 0 }; /* Rate limit */ 376 377/* 378 * Find a route for a given origin IP address and multicast group address. 379 * Statistics must be updated by the caller. 380 */ 381static __inline struct mfc * 382mfc_find(struct in_addr *o, struct in_addr *g) 383{ 384 struct mfc *rt; 385 386 MFC_LOCK_ASSERT(); 387 388 LIST_FOREACH(rt, &V_mfchashtbl[MFCHASH(*o, *g)], mfc_hash) { 389 if (in_hosteq(rt->mfc_origin, *o) && 390 in_hosteq(rt->mfc_mcastgrp, *g) && 391 TAILQ_EMPTY(&rt->mfc_stall)) 392 break; 393 } 394 395 return (rt); 396} 397 398/* 399 * Handle MRT setsockopt commands to modify the multicast forwarding tables. 400 */ 401static int 402X_ip_mrouter_set(struct socket *so, struct sockopt *sopt) 403{ 404 int error, optval; 405 vifi_t vifi; 406 struct vifctl vifc; 407 struct mfcctl2 mfc; 408 struct bw_upcall bw_upcall; 409 uint32_t i; 410 411 if (so != V_ip_mrouter && sopt->sopt_name != MRT_INIT) 412 return EPERM; 413 414 error = 0; 415 switch (sopt->sopt_name) { 416 case MRT_INIT: 417 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 418 if (error) 419 break; 420 error = ip_mrouter_init(so, optval); 421 break; 422 423 case MRT_DONE: 424 error = ip_mrouter_done(); 425 break; 426 427 case MRT_ADD_VIF: 428 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc); 429 if (error) 430 break; 431 error = add_vif(&vifc); 432 break; 433 434 case MRT_DEL_VIF: 435 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi); 436 if (error) 437 break; 438 error = del_vif(vifi); 439 break; 440 441 case MRT_ADD_MFC: 442 case MRT_DEL_MFC: 443 /* 444 * select data size depending on API version. 445 */ 446 if (sopt->sopt_name == MRT_ADD_MFC && 447 V_mrt_api_config & MRT_API_FLAGS_ALL) { 448 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl2), 449 sizeof(struct mfcctl2)); 450 } else { 451 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl), 452 sizeof(struct mfcctl)); 453 bzero((caddr_t)&mfc + sizeof(struct mfcctl), 454 sizeof(mfc) - sizeof(struct mfcctl)); 455 } 456 if (error) 457 break; 458 if (sopt->sopt_name == MRT_ADD_MFC) 459 error = add_mfc(&mfc); 460 else 461 error = del_mfc(&mfc); 462 break; 463 464 case MRT_ASSERT: 465 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 466 if (error) 467 break; 468 set_assert(optval); 469 break; 470 471 case MRT_API_CONFIG: 472 error = sooptcopyin(sopt, &i, sizeof i, sizeof i); 473 if (!error) 474 error = set_api_config(&i); 475 if (!error) 476 error = sooptcopyout(sopt, &i, sizeof i); 477 break; 478 479 case MRT_ADD_BW_UPCALL: 480 case MRT_DEL_BW_UPCALL: 481 error = sooptcopyin(sopt, &bw_upcall, sizeof bw_upcall, 482 sizeof bw_upcall); 483 if (error) 484 break; 485 if (sopt->sopt_name == MRT_ADD_BW_UPCALL) 486 error = add_bw_upcall(&bw_upcall); 487 else 488 error = del_bw_upcall(&bw_upcall); 489 break; 490 491 default: 492 error = EOPNOTSUPP; 493 break; 494 } 495 return error; 496} 497 498/* 499 * Handle MRT getsockopt commands 500 */ 501static int 502X_ip_mrouter_get(struct socket *so, struct sockopt *sopt) 503{ 504 int error; 505 506 switch (sopt->sopt_name) { 507 case MRT_VERSION: 508 error = sooptcopyout(sopt, &mrt_api_version, sizeof mrt_api_version); 509 break; 510 511 case MRT_ASSERT: 512 error = sooptcopyout(sopt, &V_pim_assert_enabled, 513 sizeof V_pim_assert_enabled); 514 break; 515 516 case MRT_API_SUPPORT: 517 error = sooptcopyout(sopt, &mrt_api_support, sizeof mrt_api_support); 518 break; 519 520 case MRT_API_CONFIG: 521 error = sooptcopyout(sopt, &V_mrt_api_config, sizeof V_mrt_api_config); 522 break; 523 524 default: 525 error = EOPNOTSUPP; 526 break; 527 } 528 return error; 529} 530 531/* 532 * Handle ioctl commands to obtain information from the cache 533 */ 534static int 535X_mrt_ioctl(u_long cmd, caddr_t data, int fibnum __unused) 536{ 537 int error = 0; 538 539 /* 540 * Currently the only function calling this ioctl routine is rtioctl(). 541 * Typically, only root can create the raw socket in order to execute 542 * this ioctl method, however the request might be coming from a prison 543 */ 544 error = priv_check(curthread, PRIV_NETINET_MROUTE); 545 if (error) 546 return (error); 547 switch (cmd) { 548 case (SIOCGETVIFCNT): 549 error = get_vif_cnt((struct sioc_vif_req *)data); 550 break; 551 552 case (SIOCGETSGCNT): 553 error = get_sg_cnt((struct sioc_sg_req *)data); 554 break; 555 556 default: 557 error = EINVAL; 558 break; 559 } 560 return error; 561} 562 563/* 564 * returns the packet, byte, rpf-failure count for the source group provided 565 */ 566static int 567get_sg_cnt(struct sioc_sg_req *req) 568{ 569 struct mfc *rt; 570 571 MFC_LOCK(); 572 rt = mfc_find(&req->src, &req->grp); 573 if (rt == NULL) { 574 MFC_UNLOCK(); 575 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 576 return EADDRNOTAVAIL; 577 } 578 req->pktcnt = rt->mfc_pkt_cnt; 579 req->bytecnt = rt->mfc_byte_cnt; 580 req->wrong_if = rt->mfc_wrong_if; 581 MFC_UNLOCK(); 582 return 0; 583} 584 585/* 586 * returns the input and output packet and byte counts on the vif provided 587 */ 588static int 589get_vif_cnt(struct sioc_vif_req *req) 590{ 591 vifi_t vifi = req->vifi; 592 593 VIF_LOCK(); 594 if (vifi >= V_numvifs) { 595 VIF_UNLOCK(); 596 return EINVAL; 597 } 598 599 req->icount = V_viftable[vifi].v_pkt_in; 600 req->ocount = V_viftable[vifi].v_pkt_out; 601 req->ibytes = V_viftable[vifi].v_bytes_in; 602 req->obytes = V_viftable[vifi].v_bytes_out; 603 VIF_UNLOCK(); 604 605 return 0; 606} 607 608static void 609if_detached_event(void *arg __unused, struct ifnet *ifp) 610{ 611 vifi_t vifi; 612 u_long i; 613 614 MROUTER_LOCK(); 615 616 if (V_ip_mrouter == NULL) { 617 MROUTER_UNLOCK(); 618 return; 619 } 620 621 VIF_LOCK(); 622 MFC_LOCK(); 623 624 /* 625 * Tear down multicast forwarder state associated with this ifnet. 626 * 1. Walk the vif list, matching vifs against this ifnet. 627 * 2. Walk the multicast forwarding cache (mfc) looking for 628 * inner matches with this vif's index. 629 * 3. Expire any matching multicast forwarding cache entries. 630 * 4. Free vif state. This should disable ALLMULTI on the interface. 631 */ 632 for (vifi = 0; vifi < V_numvifs; vifi++) { 633 if (V_viftable[vifi].v_ifp != ifp) 634 continue; 635 for (i = 0; i < mfchashsize; i++) { 636 struct mfc *rt, *nrt; 637 638 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) { 639 if (rt->mfc_parent == vifi) { 640 expire_mfc(rt); 641 } 642 } 643 } 644 del_vif_locked(vifi); 645 } 646 647 MFC_UNLOCK(); 648 VIF_UNLOCK(); 649 650 MROUTER_UNLOCK(); 651} 652 653/* 654 * Enable multicast forwarding. 655 */ 656static int 657ip_mrouter_init(struct socket *so, int version) 658{ 659 660 CTR3(KTR_IPMF, "%s: so_type %d, pr_protocol %d", __func__, 661 so->so_type, so->so_proto->pr_protocol); 662 663 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP) 664 return EOPNOTSUPP; 665 666 if (version != 1) 667 return ENOPROTOOPT; 668 669 MROUTER_LOCK(); 670 671 if (ip_mrouter_unloading) { 672 MROUTER_UNLOCK(); 673 return ENOPROTOOPT; 674 } 675 676 if (V_ip_mrouter != NULL) { 677 MROUTER_UNLOCK(); 678 return EADDRINUSE; 679 } 680 681 V_mfchashtbl = hashinit_flags(mfchashsize, M_MRTABLE, &V_mfchash, 682 HASH_NOWAIT); 683 684 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, 685 curvnet); 686 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send, 687 curvnet); 688 callout_reset(&V_bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, 689 curvnet); 690 691 V_ip_mrouter = so; 692 ip_mrouter_cnt++; 693 694 MROUTER_UNLOCK(); 695 696 CTR1(KTR_IPMF, "%s: done", __func__); 697 698 return 0; 699} 700 701/* 702 * Disable multicast forwarding. 703 */ 704static int 705X_ip_mrouter_done(void) 706{ 707 struct ifnet *ifp; 708 u_long i; 709 vifi_t vifi; 710 711 MROUTER_LOCK(); 712 713 if (V_ip_mrouter == NULL) { 714 MROUTER_UNLOCK(); 715 return EINVAL; 716 } 717 718 /* 719 * Detach/disable hooks to the reset of the system. 720 */ 721 V_ip_mrouter = NULL; 722 ip_mrouter_cnt--; 723 V_mrt_api_config = 0; 724 725 VIF_LOCK(); 726 727 /* 728 * For each phyint in use, disable promiscuous reception of all IP 729 * multicasts. 730 */ 731 for (vifi = 0; vifi < V_numvifs; vifi++) { 732 if (!in_nullhost(V_viftable[vifi].v_lcl_addr) && 733 !(V_viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) { 734 ifp = V_viftable[vifi].v_ifp; 735 if_allmulti(ifp, 0); 736 } 737 } 738 bzero((caddr_t)V_viftable, sizeof(V_viftable)); 739 V_numvifs = 0; 740 V_pim_assert_enabled = 0; 741 742 VIF_UNLOCK(); 743 744 callout_stop(&V_expire_upcalls_ch); 745 callout_stop(&V_bw_upcalls_ch); 746 callout_stop(&V_bw_meter_ch); 747 748 MFC_LOCK(); 749 750 /* 751 * Free all multicast forwarding cache entries. 752 * Do not use hashdestroy(), as we must perform other cleanup. 753 */ 754 for (i = 0; i < mfchashsize; i++) { 755 struct mfc *rt, *nrt; 756 757 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) { 758 expire_mfc(rt); 759 } 760 } 761 free(V_mfchashtbl, M_MRTABLE); 762 V_mfchashtbl = NULL; 763 764 bzero(V_nexpire, sizeof(V_nexpire[0]) * mfchashsize); 765 766 V_bw_upcalls_n = 0; 767 bzero(V_bw_meter_timers, sizeof(V_bw_meter_timers)); 768 769 MFC_UNLOCK(); 770 771 V_reg_vif_num = VIFI_INVALID; 772 773 MROUTER_UNLOCK(); 774 775 CTR1(KTR_IPMF, "%s: done", __func__); 776 777 return 0; 778} 779 780/* 781 * Set PIM assert processing global 782 */ 783static int 784set_assert(int i) 785{ 786 if ((i != 1) && (i != 0)) 787 return EINVAL; 788 789 V_pim_assert_enabled = i; 790 791 return 0; 792} 793 794/* 795 * Configure API capabilities 796 */ 797int 798set_api_config(uint32_t *apival) 799{ 800 u_long i; 801 802 /* 803 * We can set the API capabilities only if it is the first operation 804 * after MRT_INIT. I.e.: 805 * - there are no vifs installed 806 * - pim_assert is not enabled 807 * - the MFC table is empty 808 */ 809 if (V_numvifs > 0) { 810 *apival = 0; 811 return EPERM; 812 } 813 if (V_pim_assert_enabled) { 814 *apival = 0; 815 return EPERM; 816 } 817 818 MFC_LOCK(); 819 820 for (i = 0; i < mfchashsize; i++) { 821 if (LIST_FIRST(&V_mfchashtbl[i]) != NULL) { 822 MFC_UNLOCK(); 823 *apival = 0; 824 return EPERM; 825 } 826 } 827 828 MFC_UNLOCK(); 829 830 V_mrt_api_config = *apival & mrt_api_support; 831 *apival = V_mrt_api_config; 832 833 return 0; 834} 835 836/* 837 * Add a vif to the vif table 838 */ 839static int 840add_vif(struct vifctl *vifcp) 841{ 842 struct vif *vifp = V_viftable + vifcp->vifc_vifi; 843 struct sockaddr_in sin = {sizeof sin, AF_INET}; 844 struct ifaddr *ifa; 845 struct ifnet *ifp; 846 int error; 847 848 VIF_LOCK(); 849 if (vifcp->vifc_vifi >= MAXVIFS) { 850 VIF_UNLOCK(); 851 return EINVAL; 852 } 853 /* rate limiting is no longer supported by this code */ 854 if (vifcp->vifc_rate_limit != 0) { 855 log(LOG_ERR, "rate limiting is no longer supported\n"); 856 VIF_UNLOCK(); 857 return EINVAL; 858 } 859 if (!in_nullhost(vifp->v_lcl_addr)) { 860 VIF_UNLOCK(); 861 return EADDRINUSE; 862 } 863 if (in_nullhost(vifcp->vifc_lcl_addr)) { 864 VIF_UNLOCK(); 865 return EADDRNOTAVAIL; 866 } 867 868 /* Find the interface with an address in AF_INET family */ 869 if (vifcp->vifc_flags & VIFF_REGISTER) { 870 /* 871 * XXX: Because VIFF_REGISTER does not really need a valid 872 * local interface (e.g. it could be 127.0.0.2), we don't 873 * check its address. 874 */ 875 ifp = NULL; 876 } else { 877 sin.sin_addr = vifcp->vifc_lcl_addr; 878 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 879 if (ifa == NULL) { 880 VIF_UNLOCK(); 881 return EADDRNOTAVAIL; 882 } 883 ifp = ifa->ifa_ifp; 884 ifa_free(ifa); 885 } 886 887 if ((vifcp->vifc_flags & VIFF_TUNNEL) != 0) { 888 CTR1(KTR_IPMF, "%s: tunnels are no longer supported", __func__); 889 VIF_UNLOCK(); 890 return EOPNOTSUPP; 891 } else if (vifcp->vifc_flags & VIFF_REGISTER) { 892 ifp = &V_multicast_register_if; 893 CTR2(KTR_IPMF, "%s: add register vif for ifp %p", __func__, ifp); 894 if (V_reg_vif_num == VIFI_INVALID) { 895 if_initname(&V_multicast_register_if, "register_vif", 0); 896 V_multicast_register_if.if_flags = IFF_LOOPBACK; 897 V_reg_vif_num = vifcp->vifc_vifi; 898 } 899 } else { /* Make sure the interface supports multicast */ 900 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 901 VIF_UNLOCK(); 902 return EOPNOTSUPP; 903 } 904 905 /* Enable promiscuous reception of all IP multicasts from the if */ 906 error = if_allmulti(ifp, 1); 907 if (error) { 908 VIF_UNLOCK(); 909 return error; 910 } 911 } 912 913 vifp->v_flags = vifcp->vifc_flags; 914 vifp->v_threshold = vifcp->vifc_threshold; 915 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 916 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 917 vifp->v_ifp = ifp; 918 /* initialize per vif pkt counters */ 919 vifp->v_pkt_in = 0; 920 vifp->v_pkt_out = 0; 921 vifp->v_bytes_in = 0; 922 vifp->v_bytes_out = 0; 923 924 /* Adjust numvifs up if the vifi is higher than numvifs */ 925 if (V_numvifs <= vifcp->vifc_vifi) 926 V_numvifs = vifcp->vifc_vifi + 1; 927 928 VIF_UNLOCK(); 929 930 CTR4(KTR_IPMF, "%s: add vif %d laddr %s thresh %x", __func__, 931 (int)vifcp->vifc_vifi, inet_ntoa(vifcp->vifc_lcl_addr), 932 (int)vifcp->vifc_threshold); 933 934 return 0; 935} 936 937/* 938 * Delete a vif from the vif table 939 */ 940static int 941del_vif_locked(vifi_t vifi) 942{ 943 struct vif *vifp; 944 945 VIF_LOCK_ASSERT(); 946 947 if (vifi >= V_numvifs) { 948 return EINVAL; 949 } 950 vifp = &V_viftable[vifi]; 951 if (in_nullhost(vifp->v_lcl_addr)) { 952 return EADDRNOTAVAIL; 953 } 954 955 if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) 956 if_allmulti(vifp->v_ifp, 0); 957 958 if (vifp->v_flags & VIFF_REGISTER) 959 V_reg_vif_num = VIFI_INVALID; 960 961 bzero((caddr_t)vifp, sizeof (*vifp)); 962 963 CTR2(KTR_IPMF, "%s: delete vif %d", __func__, (int)vifi); 964 965 /* Adjust numvifs down */ 966 for (vifi = V_numvifs; vifi > 0; vifi--) 967 if (!in_nullhost(V_viftable[vifi-1].v_lcl_addr)) 968 break; 969 V_numvifs = vifi; 970 971 return 0; 972} 973 974static int 975del_vif(vifi_t vifi) 976{ 977 int cc; 978 979 VIF_LOCK(); 980 cc = del_vif_locked(vifi); 981 VIF_UNLOCK(); 982 983 return cc; 984} 985 986/* 987 * update an mfc entry without resetting counters and S,G addresses. 988 */ 989static void 990update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 991{ 992 int i; 993 994 rt->mfc_parent = mfccp->mfcc_parent; 995 for (i = 0; i < V_numvifs; i++) { 996 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 997 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & V_mrt_api_config & 998 MRT_MFC_FLAGS_ALL; 999 } 1000 /* set the RP address */ 1001 if (V_mrt_api_config & MRT_MFC_RP) 1002 rt->mfc_rp = mfccp->mfcc_rp; 1003 else 1004 rt->mfc_rp.s_addr = INADDR_ANY; 1005} 1006 1007/* 1008 * fully initialize an mfc entry from the parameter. 1009 */ 1010static void 1011init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp) 1012{ 1013 rt->mfc_origin = mfccp->mfcc_origin; 1014 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 1015 1016 update_mfc_params(rt, mfccp); 1017 1018 /* initialize pkt counters per src-grp */ 1019 rt->mfc_pkt_cnt = 0; 1020 rt->mfc_byte_cnt = 0; 1021 rt->mfc_wrong_if = 0; 1022 timevalclear(&rt->mfc_last_assert); 1023} 1024 1025static void 1026expire_mfc(struct mfc *rt) 1027{ 1028 struct rtdetq *rte, *nrte; 1029 1030 MFC_LOCK_ASSERT(); 1031 1032 free_bw_list(rt->mfc_bw_meter); 1033 1034 TAILQ_FOREACH_SAFE(rte, &rt->mfc_stall, rte_link, nrte) { 1035 m_freem(rte->m); 1036 TAILQ_REMOVE(&rt->mfc_stall, rte, rte_link); 1037 free(rte, M_MRTABLE); 1038 } 1039 1040 LIST_REMOVE(rt, mfc_hash); 1041 free(rt, M_MRTABLE); 1042} 1043 1044/* 1045 * Add an mfc entry 1046 */ 1047static int 1048add_mfc(struct mfcctl2 *mfccp) 1049{ 1050 struct mfc *rt; 1051 struct rtdetq *rte, *nrte; 1052 u_long hash = 0; 1053 u_short nstl; 1054 1055 VIF_LOCK(); 1056 MFC_LOCK(); 1057 1058 rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp); 1059 1060 /* If an entry already exists, just update the fields */ 1061 if (rt) { 1062 CTR4(KTR_IPMF, "%s: update mfc orig %s group %lx parent %x", 1063 __func__, inet_ntoa(mfccp->mfcc_origin), 1064 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1065 mfccp->mfcc_parent); 1066 update_mfc_params(rt, mfccp); 1067 MFC_UNLOCK(); 1068 VIF_UNLOCK(); 1069 return (0); 1070 } 1071 1072 /* 1073 * Find the entry for which the upcall was made and update 1074 */ 1075 nstl = 0; 1076 hash = MFCHASH(mfccp->mfcc_origin, mfccp->mfcc_mcastgrp); 1077 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) { 1078 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) && 1079 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp) && 1080 !TAILQ_EMPTY(&rt->mfc_stall)) { 1081 CTR5(KTR_IPMF, 1082 "%s: add mfc orig %s group %lx parent %x qh %p", 1083 __func__, inet_ntoa(mfccp->mfcc_origin), 1084 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 1085 mfccp->mfcc_parent, 1086 TAILQ_FIRST(&rt->mfc_stall)); 1087 if (nstl++) 1088 CTR1(KTR_IPMF, "%s: multiple matches", __func__); 1089 1090 init_mfc_params(rt, mfccp); 1091 rt->mfc_expire = 0; /* Don't clean this guy up */ 1092 V_nexpire[hash]--; 1093 1094 /* Free queued packets, but attempt to forward them first. */ 1095 TAILQ_FOREACH_SAFE(rte, &rt->mfc_stall, rte_link, nrte) { 1096 if (rte->ifp != NULL) 1097 ip_mdq(rte->m, rte->ifp, rt, -1); 1098 m_freem(rte->m); 1099 TAILQ_REMOVE(&rt->mfc_stall, rte, rte_link); 1100 rt->mfc_nstall--; 1101 free(rte, M_MRTABLE); 1102 } 1103 } 1104 } 1105 1106 /* 1107 * It is possible that an entry is being inserted without an upcall 1108 */ 1109 if (nstl == 0) { 1110 CTR1(KTR_IPMF, "%s: adding mfc w/o upcall", __func__); 1111 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) { 1112 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) && 1113 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp)) { 1114 init_mfc_params(rt, mfccp); 1115 if (rt->mfc_expire) 1116 V_nexpire[hash]--; 1117 rt->mfc_expire = 0; 1118 break; /* XXX */ 1119 } 1120 } 1121 1122 if (rt == NULL) { /* no upcall, so make a new entry */ 1123 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1124 if (rt == NULL) { 1125 MFC_UNLOCK(); 1126 VIF_UNLOCK(); 1127 return (ENOBUFS); 1128 } 1129 1130 init_mfc_params(rt, mfccp); 1131 TAILQ_INIT(&rt->mfc_stall); 1132 rt->mfc_nstall = 0; 1133 1134 rt->mfc_expire = 0; 1135 rt->mfc_bw_meter = NULL; 1136 1137 /* insert new entry at head of hash chain */ 1138 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash); 1139 } 1140 } 1141 1142 MFC_UNLOCK(); 1143 VIF_UNLOCK(); 1144 1145 return (0); 1146} 1147 1148/* 1149 * Delete an mfc entry 1150 */ 1151static int 1152del_mfc(struct mfcctl2 *mfccp) 1153{ 1154 struct in_addr origin; 1155 struct in_addr mcastgrp; 1156 struct mfc *rt; 1157 1158 origin = mfccp->mfcc_origin; 1159 mcastgrp = mfccp->mfcc_mcastgrp; 1160 1161 CTR3(KTR_IPMF, "%s: delete mfc orig %s group %lx", __func__, 1162 inet_ntoa(origin), (u_long)ntohl(mcastgrp.s_addr)); 1163 1164 MFC_LOCK(); 1165 1166 rt = mfc_find(&origin, &mcastgrp); 1167 if (rt == NULL) { 1168 MFC_UNLOCK(); 1169 return EADDRNOTAVAIL; 1170 } 1171 1172 /* 1173 * free the bw_meter entries 1174 */ 1175 free_bw_list(rt->mfc_bw_meter); 1176 rt->mfc_bw_meter = NULL; 1177 1178 LIST_REMOVE(rt, mfc_hash); 1179 free(rt, M_MRTABLE); 1180 1181 MFC_UNLOCK(); 1182 1183 return (0); 1184} 1185 1186/* 1187 * Send a message to the routing daemon on the multicast routing socket. 1188 */ 1189static int 1190socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src) 1191{ 1192 if (s) { 1193 SOCKBUF_LOCK(&s->so_rcv); 1194 if (sbappendaddr_locked(&s->so_rcv, (struct sockaddr *)src, mm, 1195 NULL) != 0) { 1196 sorwakeup_locked(s); 1197 return 0; 1198 } 1199 SOCKBUF_UNLOCK(&s->so_rcv); 1200 } 1201 m_freem(mm); 1202 return -1; 1203} 1204 1205/* 1206 * IP multicast forwarding function. This function assumes that the packet 1207 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1208 * pointed to by "ifp", and the packet is to be relayed to other networks 1209 * that have members of the packet's destination IP multicast group. 1210 * 1211 * The packet is returned unscathed to the caller, unless it is 1212 * erroneous, in which case a non-zero return value tells the caller to 1213 * discard it. 1214 */ 1215 1216#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1217 1218static int 1219X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m, 1220 struct ip_moptions *imo) 1221{ 1222 struct mfc *rt; 1223 int error; 1224 vifi_t vifi; 1225 1226 CTR3(KTR_IPMF, "ip_mforward: delete mfc orig %s group %lx ifp %p", 1227 inet_ntoa(ip->ip_src), (u_long)ntohl(ip->ip_dst.s_addr), ifp); 1228 1229 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 || 1230 ((u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1231 /* 1232 * Packet arrived via a physical interface or 1233 * an encapsulated tunnel or a register_vif. 1234 */ 1235 } else { 1236 /* 1237 * Packet arrived through a source-route tunnel. 1238 * Source-route tunnels are no longer supported. 1239 */ 1240 return (1); 1241 } 1242 1243 VIF_LOCK(); 1244 MFC_LOCK(); 1245 if (imo && ((vifi = imo->imo_multicast_vif) < V_numvifs)) { 1246 if (ip->ip_ttl < MAXTTL) 1247 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1248 error = ip_mdq(m, ifp, NULL, vifi); 1249 MFC_UNLOCK(); 1250 VIF_UNLOCK(); 1251 return error; 1252 } 1253 1254 /* 1255 * Don't forward a packet with time-to-live of zero or one, 1256 * or a packet destined to a local-only group. 1257 */ 1258 if (ip->ip_ttl <= 1 || IN_LOCAL_GROUP(ntohl(ip->ip_dst.s_addr))) { 1259 MFC_UNLOCK(); 1260 VIF_UNLOCK(); 1261 return 0; 1262 } 1263 1264 /* 1265 * Determine forwarding vifs from the forwarding cache table 1266 */ 1267 MRTSTAT_INC(mrts_mfc_lookups); 1268 rt = mfc_find(&ip->ip_src, &ip->ip_dst); 1269 1270 /* Entry exists, so forward if necessary */ 1271 if (rt != NULL) { 1272 error = ip_mdq(m, ifp, rt, -1); 1273 MFC_UNLOCK(); 1274 VIF_UNLOCK(); 1275 return error; 1276 } else { 1277 /* 1278 * If we don't have a route for packet's origin, 1279 * Make a copy of the packet & send message to routing daemon 1280 */ 1281 1282 struct mbuf *mb0; 1283 struct rtdetq *rte; 1284 u_long hash; 1285 int hlen = ip->ip_hl << 2; 1286 1287 MRTSTAT_INC(mrts_mfc_misses); 1288 MRTSTAT_INC(mrts_no_route); 1289 CTR2(KTR_IPMF, "ip_mforward: no mfc for (%s,%lx)", 1290 inet_ntoa(ip->ip_src), (u_long)ntohl(ip->ip_dst.s_addr)); 1291 1292 /* 1293 * Allocate mbufs early so that we don't do extra work if we are 1294 * just going to fail anyway. Make sure to pullup the header so 1295 * that other people can't step on it. 1296 */ 1297 rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, 1298 M_NOWAIT|M_ZERO); 1299 if (rte == NULL) { 1300 MFC_UNLOCK(); 1301 VIF_UNLOCK(); 1302 return ENOBUFS; 1303 } 1304 1305 mb0 = m_copypacket(m, M_NOWAIT); 1306 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen)) 1307 mb0 = m_pullup(mb0, hlen); 1308 if (mb0 == NULL) { 1309 free(rte, M_MRTABLE); 1310 MFC_UNLOCK(); 1311 VIF_UNLOCK(); 1312 return ENOBUFS; 1313 } 1314 1315 /* is there an upcall waiting for this flow ? */ 1316 hash = MFCHASH(ip->ip_src, ip->ip_dst); 1317 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) { 1318 if (in_hosteq(ip->ip_src, rt->mfc_origin) && 1319 in_hosteq(ip->ip_dst, rt->mfc_mcastgrp) && 1320 !TAILQ_EMPTY(&rt->mfc_stall)) 1321 break; 1322 } 1323 1324 if (rt == NULL) { 1325 int i; 1326 struct igmpmsg *im; 1327 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1328 struct mbuf *mm; 1329 1330 /* 1331 * Locate the vifi for the incoming interface for this packet. 1332 * If none found, drop packet. 1333 */ 1334 for (vifi = 0; vifi < V_numvifs && 1335 V_viftable[vifi].v_ifp != ifp; vifi++) 1336 ; 1337 if (vifi >= V_numvifs) /* vif not found, drop packet */ 1338 goto non_fatal; 1339 1340 /* no upcall, so make a new entry */ 1341 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1342 if (rt == NULL) 1343 goto fail; 1344 1345 /* Make a copy of the header to send to the user level process */ 1346 mm = m_copy(mb0, 0, hlen); 1347 if (mm == NULL) 1348 goto fail1; 1349 1350 /* 1351 * Send message to routing daemon to install 1352 * a route into the kernel table 1353 */ 1354 1355 im = mtod(mm, struct igmpmsg *); 1356 im->im_msgtype = IGMPMSG_NOCACHE; 1357 im->im_mbz = 0; 1358 im->im_vif = vifi; 1359 1360 MRTSTAT_INC(mrts_upcalls); 1361 1362 k_igmpsrc.sin_addr = ip->ip_src; 1363 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) { 1364 CTR0(KTR_IPMF, "ip_mforward: socket queue full"); 1365 MRTSTAT_INC(mrts_upq_sockfull); 1366fail1: 1367 free(rt, M_MRTABLE); 1368fail: 1369 free(rte, M_MRTABLE); 1370 m_freem(mb0); 1371 MFC_UNLOCK(); 1372 VIF_UNLOCK(); 1373 return ENOBUFS; 1374 } 1375 1376 /* insert new entry at head of hash chain */ 1377 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1378 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1379 rt->mfc_expire = UPCALL_EXPIRE; 1380 V_nexpire[hash]++; 1381 for (i = 0; i < V_numvifs; i++) { 1382 rt->mfc_ttls[i] = 0; 1383 rt->mfc_flags[i] = 0; 1384 } 1385 rt->mfc_parent = -1; 1386 1387 /* clear the RP address */ 1388 rt->mfc_rp.s_addr = INADDR_ANY; 1389 rt->mfc_bw_meter = NULL; 1390 1391 /* initialize pkt counters per src-grp */ 1392 rt->mfc_pkt_cnt = 0; 1393 rt->mfc_byte_cnt = 0; 1394 rt->mfc_wrong_if = 0; 1395 timevalclear(&rt->mfc_last_assert); 1396 1397 TAILQ_INIT(&rt->mfc_stall); 1398 rt->mfc_nstall = 0; 1399 1400 /* link into table */ 1401 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash); 1402 TAILQ_INSERT_HEAD(&rt->mfc_stall, rte, rte_link); 1403 rt->mfc_nstall++; 1404 1405 } else { 1406 /* determine if queue has overflowed */ 1407 if (rt->mfc_nstall > MAX_UPQ) { 1408 MRTSTAT_INC(mrts_upq_ovflw); 1409non_fatal: 1410 free(rte, M_MRTABLE); 1411 m_freem(mb0); 1412 MFC_UNLOCK(); 1413 VIF_UNLOCK(); 1414 return (0); 1415 } 1416 TAILQ_INSERT_TAIL(&rt->mfc_stall, rte, rte_link); 1417 rt->mfc_nstall++; 1418 } 1419 1420 rte->m = mb0; 1421 rte->ifp = ifp; 1422 1423 MFC_UNLOCK(); 1424 VIF_UNLOCK(); 1425 1426 return 0; 1427 } 1428} 1429 1430/* 1431 * Clean up the cache entry if upcall is not serviced 1432 */ 1433static void 1434expire_upcalls(void *arg) 1435{ 1436 u_long i; 1437 1438 CURVNET_SET((struct vnet *) arg); 1439 1440 MFC_LOCK(); 1441 1442 for (i = 0; i < mfchashsize; i++) { 1443 struct mfc *rt, *nrt; 1444 1445 if (V_nexpire[i] == 0) 1446 continue; 1447 1448 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) { 1449 if (TAILQ_EMPTY(&rt->mfc_stall)) 1450 continue; 1451 1452 if (rt->mfc_expire == 0 || --rt->mfc_expire > 0) 1453 continue; 1454 1455 /* 1456 * free the bw_meter entries 1457 */ 1458 while (rt->mfc_bw_meter != NULL) { 1459 struct bw_meter *x = rt->mfc_bw_meter; 1460 1461 rt->mfc_bw_meter = x->bm_mfc_next; 1462 free(x, M_BWMETER); 1463 } 1464 1465 MRTSTAT_INC(mrts_cache_cleanups); 1466 CTR3(KTR_IPMF, "%s: expire (%lx, %lx)", __func__, 1467 (u_long)ntohl(rt->mfc_origin.s_addr), 1468 (u_long)ntohl(rt->mfc_mcastgrp.s_addr)); 1469 1470 expire_mfc(rt); 1471 } 1472 } 1473 1474 MFC_UNLOCK(); 1475 1476 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls, 1477 curvnet); 1478 1479 CURVNET_RESTORE(); 1480} 1481 1482/* 1483 * Packet forwarding routine once entry in the cache is made 1484 */ 1485static int 1486ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif) 1487{ 1488 struct ip *ip = mtod(m, struct ip *); 1489 vifi_t vifi; 1490 int plen = ntohs(ip->ip_len); 1491 1492 VIF_LOCK_ASSERT(); 1493 1494 /* 1495 * If xmt_vif is not -1, send on only the requested vif. 1496 * 1497 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1498 */ 1499 if (xmt_vif < V_numvifs) { 1500 if (V_viftable[xmt_vif].v_flags & VIFF_REGISTER) 1501 pim_register_send(ip, V_viftable + xmt_vif, m, rt); 1502 else 1503 phyint_send(ip, V_viftable + xmt_vif, m); 1504 return 1; 1505 } 1506 1507 /* 1508 * Don't forward if it didn't arrive from the parent vif for its origin. 1509 */ 1510 vifi = rt->mfc_parent; 1511 if ((vifi >= V_numvifs) || (V_viftable[vifi].v_ifp != ifp)) { 1512 CTR4(KTR_IPMF, "%s: rx on wrong ifp %p (vifi %d, v_ifp %p)", 1513 __func__, ifp, (int)vifi, V_viftable[vifi].v_ifp); 1514 MRTSTAT_INC(mrts_wrong_if); 1515 ++rt->mfc_wrong_if; 1516 /* 1517 * If we are doing PIM assert processing, send a message 1518 * to the routing daemon. 1519 * 1520 * XXX: A PIM-SM router needs the WRONGVIF detection so it 1521 * can complete the SPT switch, regardless of the type 1522 * of the iif (broadcast media, GRE tunnel, etc). 1523 */ 1524 if (V_pim_assert_enabled && (vifi < V_numvifs) && 1525 V_viftable[vifi].v_ifp) { 1526 1527 if (ifp == &V_multicast_register_if) 1528 PIMSTAT_INC(pims_rcv_registers_wrongiif); 1529 1530 /* Get vifi for the incoming packet */ 1531 for (vifi = 0; vifi < V_numvifs && V_viftable[vifi].v_ifp != ifp; 1532 vifi++) 1533 ; 1534 if (vifi >= V_numvifs) 1535 return 0; /* The iif is not found: ignore the packet. */ 1536 1537 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF) 1538 return 0; /* WRONGVIF disabled: ignore the packet */ 1539 1540 if (ratecheck(&rt->mfc_last_assert, &pim_assert_interval)) { 1541 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1542 struct igmpmsg *im; 1543 int hlen = ip->ip_hl << 2; 1544 struct mbuf *mm = m_copy(m, 0, hlen); 1545 1546 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1547 mm = m_pullup(mm, hlen); 1548 if (mm == NULL) 1549 return ENOBUFS; 1550 1551 im = mtod(mm, struct igmpmsg *); 1552 im->im_msgtype = IGMPMSG_WRONGVIF; 1553 im->im_mbz = 0; 1554 im->im_vif = vifi; 1555 1556 MRTSTAT_INC(mrts_upcalls); 1557 1558 k_igmpsrc.sin_addr = im->im_src; 1559 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) { 1560 CTR1(KTR_IPMF, "%s: socket queue full", __func__); 1561 MRTSTAT_INC(mrts_upq_sockfull); 1562 return ENOBUFS; 1563 } 1564 } 1565 } 1566 return 0; 1567 } 1568 1569 1570 /* If I sourced this packet, it counts as output, else it was input. */ 1571 if (in_hosteq(ip->ip_src, V_viftable[vifi].v_lcl_addr)) { 1572 V_viftable[vifi].v_pkt_out++; 1573 V_viftable[vifi].v_bytes_out += plen; 1574 } else { 1575 V_viftable[vifi].v_pkt_in++; 1576 V_viftable[vifi].v_bytes_in += plen; 1577 } 1578 rt->mfc_pkt_cnt++; 1579 rt->mfc_byte_cnt += plen; 1580 1581 /* 1582 * For each vif, decide if a copy of the packet should be forwarded. 1583 * Forward if: 1584 * - the ttl exceeds the vif's threshold 1585 * - there are group members downstream on interface 1586 */ 1587 for (vifi = 0; vifi < V_numvifs; vifi++) 1588 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1589 V_viftable[vifi].v_pkt_out++; 1590 V_viftable[vifi].v_bytes_out += plen; 1591 if (V_viftable[vifi].v_flags & VIFF_REGISTER) 1592 pim_register_send(ip, V_viftable + vifi, m, rt); 1593 else 1594 phyint_send(ip, V_viftable + vifi, m); 1595 } 1596 1597 /* 1598 * Perform upcall-related bw measuring. 1599 */ 1600 if (rt->mfc_bw_meter != NULL) { 1601 struct bw_meter *x; 1602 struct timeval now; 1603 1604 microtime(&now); 1605 MFC_LOCK_ASSERT(); 1606 for (x = rt->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) 1607 bw_meter_receive_packet(x, plen, &now); 1608 } 1609 1610 return 0; 1611} 1612 1613/* 1614 * Check if a vif number is legal/ok. This is used by in_mcast.c. 1615 */ 1616static int 1617X_legal_vif_num(int vif) 1618{ 1619 int ret; 1620 1621 ret = 0; 1622 if (vif < 0) 1623 return (ret); 1624 1625 VIF_LOCK(); 1626 if (vif < V_numvifs) 1627 ret = 1; 1628 VIF_UNLOCK(); 1629 1630 return (ret); 1631} 1632 1633/* 1634 * Return the local address used by this vif 1635 */ 1636static u_long 1637X_ip_mcast_src(int vifi) 1638{ 1639 in_addr_t addr; 1640 1641 addr = INADDR_ANY; 1642 if (vifi < 0) 1643 return (addr); 1644 1645 VIF_LOCK(); 1646 if (vifi < V_numvifs) 1647 addr = V_viftable[vifi].v_lcl_addr.s_addr; 1648 VIF_UNLOCK(); 1649 1650 return (addr); 1651} 1652 1653static void 1654phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1655{ 1656 struct mbuf *mb_copy; 1657 int hlen = ip->ip_hl << 2; 1658 1659 VIF_LOCK_ASSERT(); 1660 1661 /* 1662 * Make a new reference to the packet; make sure that 1663 * the IP header is actually copied, not just referenced, 1664 * so that ip_output() only scribbles on the copy. 1665 */ 1666 mb_copy = m_copypacket(m, M_NOWAIT); 1667 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1668 mb_copy = m_pullup(mb_copy, hlen); 1669 if (mb_copy == NULL) 1670 return; 1671 1672 send_packet(vifp, mb_copy); 1673} 1674 1675static void 1676send_packet(struct vif *vifp, struct mbuf *m) 1677{ 1678 struct ip_moptions imo; 1679 struct in_multi *imm[2]; 1680 int error; 1681 1682 VIF_LOCK_ASSERT(); 1683 1684 imo.imo_multicast_ifp = vifp->v_ifp; 1685 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 1686 imo.imo_multicast_loop = 1; 1687 imo.imo_multicast_vif = -1; 1688 imo.imo_num_memberships = 0; 1689 imo.imo_max_memberships = 2; 1690 imo.imo_membership = &imm[0]; 1691 1692 /* 1693 * Re-entrancy should not be a problem here, because 1694 * the packets that we send out and are looped back at us 1695 * should get rejected because they appear to come from 1696 * the loopback interface, thus preventing looping. 1697 */ 1698 error = ip_output(m, NULL, NULL, IP_FORWARDING, &imo, NULL); 1699 CTR3(KTR_IPMF, "%s: vif %td err %d", __func__, 1700 (ptrdiff_t)(vifp - V_viftable), error); 1701} 1702 1703/* 1704 * Stubs for old RSVP socket shim implementation. 1705 */ 1706 1707static int 1708X_ip_rsvp_vif(struct socket *so __unused, struct sockopt *sopt __unused) 1709{ 1710 1711 return (EOPNOTSUPP); 1712} 1713 1714static void 1715X_ip_rsvp_force_done(struct socket *so __unused) 1716{ 1717 1718} 1719 1720static void 1721X_rsvp_input(struct mbuf *m, int off __unused) 1722{ 1723 1724 if (!V_rsvp_on) 1725 m_freem(m); 1726} 1727 1728/* 1729 * Code for bandwidth monitors 1730 */ 1731 1732/* 1733 * Define common interface for timeval-related methods 1734 */ 1735#define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp) 1736#define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp)) 1737#define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp)) 1738 1739static uint32_t 1740compute_bw_meter_flags(struct bw_upcall *req) 1741{ 1742 uint32_t flags = 0; 1743 1744 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS) 1745 flags |= BW_METER_UNIT_PACKETS; 1746 if (req->bu_flags & BW_UPCALL_UNIT_BYTES) 1747 flags |= BW_METER_UNIT_BYTES; 1748 if (req->bu_flags & BW_UPCALL_GEQ) 1749 flags |= BW_METER_GEQ; 1750 if (req->bu_flags & BW_UPCALL_LEQ) 1751 flags |= BW_METER_LEQ; 1752 1753 return flags; 1754} 1755 1756/* 1757 * Add a bw_meter entry 1758 */ 1759static int 1760add_bw_upcall(struct bw_upcall *req) 1761{ 1762 struct mfc *mfc; 1763 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC, 1764 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC }; 1765 struct timeval now; 1766 struct bw_meter *x; 1767 uint32_t flags; 1768 1769 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL)) 1770 return EOPNOTSUPP; 1771 1772 /* Test if the flags are valid */ 1773 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES))) 1774 return EINVAL; 1775 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))) 1776 return EINVAL; 1777 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 1778 == (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) 1779 return EINVAL; 1780 1781 /* Test if the threshold time interval is valid */ 1782 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <)) 1783 return EINVAL; 1784 1785 flags = compute_bw_meter_flags(req); 1786 1787 /* 1788 * Find if we have already same bw_meter entry 1789 */ 1790 MFC_LOCK(); 1791 mfc = mfc_find(&req->bu_src, &req->bu_dst); 1792 if (mfc == NULL) { 1793 MFC_UNLOCK(); 1794 return EADDRNOTAVAIL; 1795 } 1796 for (x = mfc->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) { 1797 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 1798 &req->bu_threshold.b_time, ==)) && 1799 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 1800 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 1801 (x->bm_flags & BW_METER_USER_FLAGS) == flags) { 1802 MFC_UNLOCK(); 1803 return 0; /* XXX Already installed */ 1804 } 1805 } 1806 1807 /* Allocate the new bw_meter entry */ 1808 x = (struct bw_meter *)malloc(sizeof(*x), M_BWMETER, M_NOWAIT); 1809 if (x == NULL) { 1810 MFC_UNLOCK(); 1811 return ENOBUFS; 1812 } 1813 1814 /* Set the new bw_meter entry */ 1815 x->bm_threshold.b_time = req->bu_threshold.b_time; 1816 microtime(&now); 1817 x->bm_start_time = now; 1818 x->bm_threshold.b_packets = req->bu_threshold.b_packets; 1819 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes; 1820 x->bm_measured.b_packets = 0; 1821 x->bm_measured.b_bytes = 0; 1822 x->bm_flags = flags; 1823 x->bm_time_next = NULL; 1824 x->bm_time_hash = BW_METER_BUCKETS; 1825 1826 /* Add the new bw_meter entry to the front of entries for this MFC */ 1827 x->bm_mfc = mfc; 1828 x->bm_mfc_next = mfc->mfc_bw_meter; 1829 mfc->mfc_bw_meter = x; 1830 schedule_bw_meter(x, &now); 1831 MFC_UNLOCK(); 1832 1833 return 0; 1834} 1835 1836static void 1837free_bw_list(struct bw_meter *list) 1838{ 1839 while (list != NULL) { 1840 struct bw_meter *x = list; 1841 1842 list = list->bm_mfc_next; 1843 unschedule_bw_meter(x); 1844 free(x, M_BWMETER); 1845 } 1846} 1847 1848/* 1849 * Delete one or multiple bw_meter entries 1850 */ 1851static int 1852del_bw_upcall(struct bw_upcall *req) 1853{ 1854 struct mfc *mfc; 1855 struct bw_meter *x; 1856 1857 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL)) 1858 return EOPNOTSUPP; 1859 1860 MFC_LOCK(); 1861 1862 /* Find the corresponding MFC entry */ 1863 mfc = mfc_find(&req->bu_src, &req->bu_dst); 1864 if (mfc == NULL) { 1865 MFC_UNLOCK(); 1866 return EADDRNOTAVAIL; 1867 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) { 1868 /* 1869 * Delete all bw_meter entries for this mfc 1870 */ 1871 struct bw_meter *list; 1872 1873 list = mfc->mfc_bw_meter; 1874 mfc->mfc_bw_meter = NULL; 1875 free_bw_list(list); 1876 MFC_UNLOCK(); 1877 return 0; 1878 } else { /* Delete a single bw_meter entry */ 1879 struct bw_meter *prev; 1880 uint32_t flags = 0; 1881 1882 flags = compute_bw_meter_flags(req); 1883 1884 /* Find the bw_meter entry to delete */ 1885 for (prev = NULL, x = mfc->mfc_bw_meter; x != NULL; 1886 prev = x, x = x->bm_mfc_next) { 1887 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, 1888 &req->bu_threshold.b_time, ==)) && 1889 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) && 1890 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) && 1891 (x->bm_flags & BW_METER_USER_FLAGS) == flags) 1892 break; 1893 } 1894 if (x != NULL) { /* Delete entry from the list for this MFC */ 1895 if (prev != NULL) 1896 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/ 1897 else 1898 x->bm_mfc->mfc_bw_meter = x->bm_mfc_next;/* new head of list */ 1899 1900 unschedule_bw_meter(x); 1901 MFC_UNLOCK(); 1902 /* Free the bw_meter entry */ 1903 free(x, M_BWMETER); 1904 return 0; 1905 } else { 1906 MFC_UNLOCK(); 1907 return EINVAL; 1908 } 1909 } 1910 /* NOTREACHED */ 1911} 1912 1913/* 1914 * Perform bandwidth measurement processing that may result in an upcall 1915 */ 1916static void 1917bw_meter_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp) 1918{ 1919 struct timeval delta; 1920 1921 MFC_LOCK_ASSERT(); 1922 1923 delta = *nowp; 1924 BW_TIMEVALDECR(&delta, &x->bm_start_time); 1925 1926 if (x->bm_flags & BW_METER_GEQ) { 1927 /* 1928 * Processing for ">=" type of bw_meter entry 1929 */ 1930 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 1931 /* Reset the bw_meter entry */ 1932 x->bm_start_time = *nowp; 1933 x->bm_measured.b_packets = 0; 1934 x->bm_measured.b_bytes = 0; 1935 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 1936 } 1937 1938 /* Record that a packet is received */ 1939 x->bm_measured.b_packets++; 1940 x->bm_measured.b_bytes += plen; 1941 1942 /* 1943 * Test if we should deliver an upcall 1944 */ 1945 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) { 1946 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 1947 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) || 1948 ((x->bm_flags & BW_METER_UNIT_BYTES) && 1949 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) { 1950 /* Prepare an upcall for delivery */ 1951 bw_meter_prepare_upcall(x, nowp); 1952 x->bm_flags |= BW_METER_UPCALL_DELIVERED; 1953 } 1954 } 1955 } else if (x->bm_flags & BW_METER_LEQ) { 1956 /* 1957 * Processing for "<=" type of bw_meter entry 1958 */ 1959 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) { 1960 /* 1961 * We are behind time with the multicast forwarding table 1962 * scanning for "<=" type of bw_meter entries, so test now 1963 * if we should deliver an upcall. 1964 */ 1965 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 1966 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 1967 ((x->bm_flags & BW_METER_UNIT_BYTES) && 1968 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 1969 /* Prepare an upcall for delivery */ 1970 bw_meter_prepare_upcall(x, nowp); 1971 } 1972 /* Reschedule the bw_meter entry */ 1973 unschedule_bw_meter(x); 1974 schedule_bw_meter(x, nowp); 1975 } 1976 1977 /* Record that a packet is received */ 1978 x->bm_measured.b_packets++; 1979 x->bm_measured.b_bytes += plen; 1980 1981 /* 1982 * Test if we should restart the measuring interval 1983 */ 1984 if ((x->bm_flags & BW_METER_UNIT_PACKETS && 1985 x->bm_measured.b_packets <= x->bm_threshold.b_packets) || 1986 (x->bm_flags & BW_METER_UNIT_BYTES && 1987 x->bm_measured.b_bytes <= x->bm_threshold.b_bytes)) { 1988 /* Don't restart the measuring interval */ 1989 } else { 1990 /* Do restart the measuring interval */ 1991 /* 1992 * XXX: note that we don't unschedule and schedule, because this 1993 * might be too much overhead per packet. Instead, when we process 1994 * all entries for a given timer hash bin, we check whether it is 1995 * really a timeout. If not, we reschedule at that time. 1996 */ 1997 x->bm_start_time = *nowp; 1998 x->bm_measured.b_packets = 0; 1999 x->bm_measured.b_bytes = 0; 2000 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2001 } 2002 } 2003} 2004 2005/* 2006 * Prepare a bandwidth-related upcall 2007 */ 2008static void 2009bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp) 2010{ 2011 struct timeval delta; 2012 struct bw_upcall *u; 2013 2014 MFC_LOCK_ASSERT(); 2015 2016 /* 2017 * Compute the measured time interval 2018 */ 2019 delta = *nowp; 2020 BW_TIMEVALDECR(&delta, &x->bm_start_time); 2021 2022 /* 2023 * If there are too many pending upcalls, deliver them now 2024 */ 2025 if (V_bw_upcalls_n >= BW_UPCALLS_MAX) 2026 bw_upcalls_send(); 2027 2028 /* 2029 * Set the bw_upcall entry 2030 */ 2031 u = &V_bw_upcalls[V_bw_upcalls_n++]; 2032 u->bu_src = x->bm_mfc->mfc_origin; 2033 u->bu_dst = x->bm_mfc->mfc_mcastgrp; 2034 u->bu_threshold.b_time = x->bm_threshold.b_time; 2035 u->bu_threshold.b_packets = x->bm_threshold.b_packets; 2036 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes; 2037 u->bu_measured.b_time = delta; 2038 u->bu_measured.b_packets = x->bm_measured.b_packets; 2039 u->bu_measured.b_bytes = x->bm_measured.b_bytes; 2040 u->bu_flags = 0; 2041 if (x->bm_flags & BW_METER_UNIT_PACKETS) 2042 u->bu_flags |= BW_UPCALL_UNIT_PACKETS; 2043 if (x->bm_flags & BW_METER_UNIT_BYTES) 2044 u->bu_flags |= BW_UPCALL_UNIT_BYTES; 2045 if (x->bm_flags & BW_METER_GEQ) 2046 u->bu_flags |= BW_UPCALL_GEQ; 2047 if (x->bm_flags & BW_METER_LEQ) 2048 u->bu_flags |= BW_UPCALL_LEQ; 2049} 2050 2051/* 2052 * Send the pending bandwidth-related upcalls 2053 */ 2054static void 2055bw_upcalls_send(void) 2056{ 2057 struct mbuf *m; 2058 int len = V_bw_upcalls_n * sizeof(V_bw_upcalls[0]); 2059 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2060 static struct igmpmsg igmpmsg = { 0, /* unused1 */ 2061 0, /* unused2 */ 2062 IGMPMSG_BW_UPCALL,/* im_msgtype */ 2063 0, /* im_mbz */ 2064 0, /* im_vif */ 2065 0, /* unused3 */ 2066 { 0 }, /* im_src */ 2067 { 0 } }; /* im_dst */ 2068 2069 MFC_LOCK_ASSERT(); 2070 2071 if (V_bw_upcalls_n == 0) 2072 return; /* No pending upcalls */ 2073 2074 V_bw_upcalls_n = 0; 2075 2076 /* 2077 * Allocate a new mbuf, initialize it with the header and 2078 * the payload for the pending calls. 2079 */ 2080 m = m_gethdr(M_NOWAIT, MT_DATA); 2081 if (m == NULL) { 2082 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n"); 2083 return; 2084 } 2085 2086 m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg); 2087 m_copyback(m, sizeof(struct igmpmsg), len, (caddr_t)&V_bw_upcalls[0]); 2088 2089 /* 2090 * Send the upcalls 2091 * XXX do we need to set the address in k_igmpsrc ? 2092 */ 2093 MRTSTAT_INC(mrts_upcalls); 2094 if (socket_send(V_ip_mrouter, m, &k_igmpsrc) < 0) { 2095 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n"); 2096 MRTSTAT_INC(mrts_upq_sockfull); 2097 } 2098} 2099 2100/* 2101 * Compute the timeout hash value for the bw_meter entries 2102 */ 2103#define BW_METER_TIMEHASH(bw_meter, hash) \ 2104 do { \ 2105 struct timeval next_timeval = (bw_meter)->bm_start_time; \ 2106 \ 2107 BW_TIMEVALADD(&next_timeval, &(bw_meter)->bm_threshold.b_time); \ 2108 (hash) = next_timeval.tv_sec; \ 2109 if (next_timeval.tv_usec) \ 2110 (hash)++; /* XXX: make sure we don't timeout early */ \ 2111 (hash) %= BW_METER_BUCKETS; \ 2112 } while (0) 2113 2114/* 2115 * Schedule a timer to process periodically bw_meter entry of type "<=" 2116 * by linking the entry in the proper hash bucket. 2117 */ 2118static void 2119schedule_bw_meter(struct bw_meter *x, struct timeval *nowp) 2120{ 2121 int time_hash; 2122 2123 MFC_LOCK_ASSERT(); 2124 2125 if (!(x->bm_flags & BW_METER_LEQ)) 2126 return; /* XXX: we schedule timers only for "<=" entries */ 2127 2128 /* 2129 * Reset the bw_meter entry 2130 */ 2131 x->bm_start_time = *nowp; 2132 x->bm_measured.b_packets = 0; 2133 x->bm_measured.b_bytes = 0; 2134 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED; 2135 2136 /* 2137 * Compute the timeout hash value and insert the entry 2138 */ 2139 BW_METER_TIMEHASH(x, time_hash); 2140 x->bm_time_next = V_bw_meter_timers[time_hash]; 2141 V_bw_meter_timers[time_hash] = x; 2142 x->bm_time_hash = time_hash; 2143} 2144 2145/* 2146 * Unschedule the periodic timer that processes bw_meter entry of type "<=" 2147 * by removing the entry from the proper hash bucket. 2148 */ 2149static void 2150unschedule_bw_meter(struct bw_meter *x) 2151{ 2152 int time_hash; 2153 struct bw_meter *prev, *tmp; 2154 2155 MFC_LOCK_ASSERT(); 2156 2157 if (!(x->bm_flags & BW_METER_LEQ)) 2158 return; /* XXX: we schedule timers only for "<=" entries */ 2159 2160 /* 2161 * Compute the timeout hash value and delete the entry 2162 */ 2163 time_hash = x->bm_time_hash; 2164 if (time_hash >= BW_METER_BUCKETS) 2165 return; /* Entry was not scheduled */ 2166 2167 for (prev = NULL, tmp = V_bw_meter_timers[time_hash]; 2168 tmp != NULL; prev = tmp, tmp = tmp->bm_time_next) 2169 if (tmp == x) 2170 break; 2171 2172 if (tmp == NULL) 2173 panic("unschedule_bw_meter: bw_meter entry not found"); 2174 2175 if (prev != NULL) 2176 prev->bm_time_next = x->bm_time_next; 2177 else 2178 V_bw_meter_timers[time_hash] = x->bm_time_next; 2179 2180 x->bm_time_next = NULL; 2181 x->bm_time_hash = BW_METER_BUCKETS; 2182} 2183 2184 2185/* 2186 * Process all "<=" type of bw_meter that should be processed now, 2187 * and for each entry prepare an upcall if necessary. Each processed 2188 * entry is rescheduled again for the (periodic) processing. 2189 * 2190 * This is run periodically (once per second normally). On each round, 2191 * all the potentially matching entries are in the hash slot that we are 2192 * looking at. 2193 */ 2194static void 2195bw_meter_process() 2196{ 2197 uint32_t loops; 2198 int i; 2199 struct timeval now, process_endtime; 2200 2201 microtime(&now); 2202 if (V_last_tv_sec == now.tv_sec) 2203 return; /* nothing to do */ 2204 2205 loops = now.tv_sec - V_last_tv_sec; 2206 V_last_tv_sec = now.tv_sec; 2207 if (loops > BW_METER_BUCKETS) 2208 loops = BW_METER_BUCKETS; 2209 2210 MFC_LOCK(); 2211 /* 2212 * Process all bins of bw_meter entries from the one after the last 2213 * processed to the current one. On entry, i points to the last bucket 2214 * visited, so we need to increment i at the beginning of the loop. 2215 */ 2216 for (i = (now.tv_sec - loops) % BW_METER_BUCKETS; loops > 0; loops--) { 2217 struct bw_meter *x, *tmp_list; 2218 2219 if (++i >= BW_METER_BUCKETS) 2220 i = 0; 2221 2222 /* Disconnect the list of bw_meter entries from the bin */ 2223 tmp_list = V_bw_meter_timers[i]; 2224 V_bw_meter_timers[i] = NULL; 2225 2226 /* Process the list of bw_meter entries */ 2227 while (tmp_list != NULL) { 2228 x = tmp_list; 2229 tmp_list = tmp_list->bm_time_next; 2230 2231 /* Test if the time interval is over */ 2232 process_endtime = x->bm_start_time; 2233 BW_TIMEVALADD(&process_endtime, &x->bm_threshold.b_time); 2234 if (BW_TIMEVALCMP(&process_endtime, &now, >)) { 2235 /* Not yet: reschedule, but don't reset */ 2236 int time_hash; 2237 2238 BW_METER_TIMEHASH(x, time_hash); 2239 if (time_hash == i && process_endtime.tv_sec == now.tv_sec) { 2240 /* 2241 * XXX: somehow the bin processing is a bit ahead of time. 2242 * Put the entry in the next bin. 2243 */ 2244 if (++time_hash >= BW_METER_BUCKETS) 2245 time_hash = 0; 2246 } 2247 x->bm_time_next = V_bw_meter_timers[time_hash]; 2248 V_bw_meter_timers[time_hash] = x; 2249 x->bm_time_hash = time_hash; 2250 2251 continue; 2252 } 2253 2254 /* 2255 * Test if we should deliver an upcall 2256 */ 2257 if (((x->bm_flags & BW_METER_UNIT_PACKETS) && 2258 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) || 2259 ((x->bm_flags & BW_METER_UNIT_BYTES) && 2260 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) { 2261 /* Prepare an upcall for delivery */ 2262 bw_meter_prepare_upcall(x, &now); 2263 } 2264 2265 /* 2266 * Reschedule for next processing 2267 */ 2268 schedule_bw_meter(x, &now); 2269 } 2270 } 2271 2272 /* Send all upcalls that are pending delivery */ 2273 bw_upcalls_send(); 2274 2275 MFC_UNLOCK(); 2276} 2277 2278/* 2279 * A periodic function for sending all upcalls that are pending delivery 2280 */ 2281static void 2282expire_bw_upcalls_send(void *arg) 2283{ 2284 CURVNET_SET((struct vnet *) arg); 2285 2286 MFC_LOCK(); 2287 bw_upcalls_send(); 2288 MFC_UNLOCK(); 2289 2290 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send, 2291 curvnet); 2292 CURVNET_RESTORE(); 2293} 2294 2295/* 2296 * A periodic function for periodic scanning of the multicast forwarding 2297 * table for processing all "<=" bw_meter entries. 2298 */ 2299static void 2300expire_bw_meter_process(void *arg) 2301{ 2302 CURVNET_SET((struct vnet *) arg); 2303 2304 if (V_mrt_api_config & MRT_MFC_BW_UPCALL) 2305 bw_meter_process(); 2306 2307 callout_reset(&V_bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process, 2308 curvnet); 2309 CURVNET_RESTORE(); 2310} 2311 2312/* 2313 * End of bandwidth monitoring code 2314 */ 2315 2316/* 2317 * Send the packet up to the user daemon, or eventually do kernel encapsulation 2318 * 2319 */ 2320static int 2321pim_register_send(struct ip *ip, struct vif *vifp, struct mbuf *m, 2322 struct mfc *rt) 2323{ 2324 struct mbuf *mb_copy, *mm; 2325 2326 /* 2327 * Do not send IGMP_WHOLEPKT notifications to userland, if the 2328 * rendezvous point was unspecified, and we were told not to. 2329 */ 2330 if (pim_squelch_wholepkt != 0 && (V_mrt_api_config & MRT_MFC_RP) && 2331 in_nullhost(rt->mfc_rp)) 2332 return 0; 2333 2334 mb_copy = pim_register_prepare(ip, m); 2335 if (mb_copy == NULL) 2336 return ENOBUFS; 2337 2338 /* 2339 * Send all the fragments. Note that the mbuf for each fragment 2340 * is freed by the sending machinery. 2341 */ 2342 for (mm = mb_copy; mm; mm = mb_copy) { 2343 mb_copy = mm->m_nextpkt; 2344 mm->m_nextpkt = 0; 2345 mm = m_pullup(mm, sizeof(struct ip)); 2346 if (mm != NULL) { 2347 ip = mtod(mm, struct ip *); 2348 if ((V_mrt_api_config & MRT_MFC_RP) && !in_nullhost(rt->mfc_rp)) { 2349 pim_register_send_rp(ip, vifp, mm, rt); 2350 } else { 2351 pim_register_send_upcall(ip, vifp, mm, rt); 2352 } 2353 } 2354 } 2355 2356 return 0; 2357} 2358 2359/* 2360 * Return a copy of the data packet that is ready for PIM Register 2361 * encapsulation. 2362 * XXX: Note that in the returned copy the IP header is a valid one. 2363 */ 2364static struct mbuf * 2365pim_register_prepare(struct ip *ip, struct mbuf *m) 2366{ 2367 struct mbuf *mb_copy = NULL; 2368 int mtu; 2369 2370 /* Take care of delayed checksums */ 2371 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 2372 in_delayed_cksum(m); 2373 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 2374 } 2375 2376 /* 2377 * Copy the old packet & pullup its IP header into the 2378 * new mbuf so we can modify it. 2379 */ 2380 mb_copy = m_copypacket(m, M_NOWAIT); 2381 if (mb_copy == NULL) 2382 return NULL; 2383 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2); 2384 if (mb_copy == NULL) 2385 return NULL; 2386 2387 /* take care of the TTL */ 2388 ip = mtod(mb_copy, struct ip *); 2389 --ip->ip_ttl; 2390 2391 /* Compute the MTU after the PIM Register encapsulation */ 2392 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr); 2393 2394 if (ntohs(ip->ip_len) <= mtu) { 2395 /* Turn the IP header into a valid one */ 2396 ip->ip_sum = 0; 2397 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 2398 } else { 2399 /* Fragment the packet */ 2400 mb_copy->m_pkthdr.csum_flags |= CSUM_IP; 2401 if (ip_fragment(ip, &mb_copy, mtu, 0) != 0) { 2402 m_freem(mb_copy); 2403 return NULL; 2404 } 2405 } 2406 return mb_copy; 2407} 2408 2409/* 2410 * Send an upcall with the data packet to the user-level process. 2411 */ 2412static int 2413pim_register_send_upcall(struct ip *ip, struct vif *vifp, 2414 struct mbuf *mb_copy, struct mfc *rt) 2415{ 2416 struct mbuf *mb_first; 2417 int len = ntohs(ip->ip_len); 2418 struct igmpmsg *im; 2419 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 2420 2421 VIF_LOCK_ASSERT(); 2422 2423 /* 2424 * Add a new mbuf with an upcall header 2425 */ 2426 mb_first = m_gethdr(M_NOWAIT, MT_DATA); 2427 if (mb_first == NULL) { 2428 m_freem(mb_copy); 2429 return ENOBUFS; 2430 } 2431 mb_first->m_data += max_linkhdr; 2432 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg); 2433 mb_first->m_len = sizeof(struct igmpmsg); 2434 mb_first->m_next = mb_copy; 2435 2436 /* Send message to routing daemon */ 2437 im = mtod(mb_first, struct igmpmsg *); 2438 im->im_msgtype = IGMPMSG_WHOLEPKT; 2439 im->im_mbz = 0; 2440 im->im_vif = vifp - V_viftable; 2441 im->im_src = ip->ip_src; 2442 im->im_dst = ip->ip_dst; 2443 2444 k_igmpsrc.sin_addr = ip->ip_src; 2445 2446 MRTSTAT_INC(mrts_upcalls); 2447 2448 if (socket_send(V_ip_mrouter, mb_first, &k_igmpsrc) < 0) { 2449 CTR1(KTR_IPMF, "%s: socket queue full", __func__); 2450 MRTSTAT_INC(mrts_upq_sockfull); 2451 return ENOBUFS; 2452 } 2453 2454 /* Keep statistics */ 2455 PIMSTAT_INC(pims_snd_registers_msgs); 2456 PIMSTAT_ADD(pims_snd_registers_bytes, len); 2457 2458 return 0; 2459} 2460 2461/* 2462 * Encapsulate the data packet in PIM Register message and send it to the RP. 2463 */ 2464static int 2465pim_register_send_rp(struct ip *ip, struct vif *vifp, struct mbuf *mb_copy, 2466 struct mfc *rt) 2467{ 2468 struct mbuf *mb_first; 2469 struct ip *ip_outer; 2470 struct pim_encap_pimhdr *pimhdr; 2471 int len = ntohs(ip->ip_len); 2472 vifi_t vifi = rt->mfc_parent; 2473 2474 VIF_LOCK_ASSERT(); 2475 2476 if ((vifi >= V_numvifs) || in_nullhost(V_viftable[vifi].v_lcl_addr)) { 2477 m_freem(mb_copy); 2478 return EADDRNOTAVAIL; /* The iif vif is invalid */ 2479 } 2480 2481 /* 2482 * Add a new mbuf with the encapsulating header 2483 */ 2484 mb_first = m_gethdr(M_NOWAIT, MT_DATA); 2485 if (mb_first == NULL) { 2486 m_freem(mb_copy); 2487 return ENOBUFS; 2488 } 2489 mb_first->m_data += max_linkhdr; 2490 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr); 2491 mb_first->m_next = mb_copy; 2492 2493 mb_first->m_pkthdr.len = len + mb_first->m_len; 2494 2495 /* 2496 * Fill in the encapsulating IP and PIM header 2497 */ 2498 ip_outer = mtod(mb_first, struct ip *); 2499 *ip_outer = pim_encap_iphdr; 2500 ip_outer->ip_id = ip_newid(); 2501 ip_outer->ip_len = htons(len + sizeof(pim_encap_iphdr) + 2502 sizeof(pim_encap_pimhdr)); 2503 ip_outer->ip_src = V_viftable[vifi].v_lcl_addr; 2504 ip_outer->ip_dst = rt->mfc_rp; 2505 /* 2506 * Copy the inner header TOS to the outer header, and take care of the 2507 * IP_DF bit. 2508 */ 2509 ip_outer->ip_tos = ip->ip_tos; 2510 if (ip->ip_off & htons(IP_DF)) 2511 ip_outer->ip_off |= htons(IP_DF); 2512 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer 2513 + sizeof(pim_encap_iphdr)); 2514 *pimhdr = pim_encap_pimhdr; 2515 /* If the iif crosses a border, set the Border-bit */ 2516 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & V_mrt_api_config) 2517 pimhdr->flags |= htonl(PIM_BORDER_REGISTER); 2518 2519 mb_first->m_data += sizeof(pim_encap_iphdr); 2520 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr)); 2521 mb_first->m_data -= sizeof(pim_encap_iphdr); 2522 2523 send_packet(vifp, mb_first); 2524 2525 /* Keep statistics */ 2526 PIMSTAT_INC(pims_snd_registers_msgs); 2527 PIMSTAT_ADD(pims_snd_registers_bytes, len); 2528 2529 return 0; 2530} 2531 2532/* 2533 * pim_encapcheck() is called by the encap4_input() path at runtime to 2534 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 2535 * into the kernel. 2536 */ 2537static int 2538pim_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 2539{ 2540 2541#ifdef DIAGNOSTIC 2542 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 2543#endif 2544 if (proto != IPPROTO_PIM) 2545 return 0; /* not for us; reject the datagram. */ 2546 2547 return 64; /* claim the datagram. */ 2548} 2549 2550/* 2551 * PIM-SMv2 and PIM-DM messages processing. 2552 * Receives and verifies the PIM control messages, and passes them 2553 * up to the listening socket, using rip_input(). 2554 * The only message with special processing is the PIM_REGISTER message 2555 * (used by PIM-SM): the PIM header is stripped off, and the inner packet 2556 * is passed to if_simloop(). 2557 */ 2558void 2559pim_input(struct mbuf *m, int iphlen) 2560{ 2561 struct ip *ip = mtod(m, struct ip *); 2562 struct pim *pim; 2563 int minlen; 2564 int datalen = ntohs(ip->ip_len) - iphlen; 2565 int ip_tos; 2566 2567 /* Keep statistics */ 2568 PIMSTAT_INC(pims_rcv_total_msgs); 2569 PIMSTAT_ADD(pims_rcv_total_bytes, datalen); 2570 2571 /* 2572 * Validate lengths 2573 */ 2574 if (datalen < PIM_MINLEN) { 2575 PIMSTAT_INC(pims_rcv_tooshort); 2576 CTR3(KTR_IPMF, "%s: short packet (%d) from %s", 2577 __func__, datalen, inet_ntoa(ip->ip_src)); 2578 m_freem(m); 2579 return; 2580 } 2581 2582 /* 2583 * If the packet is at least as big as a REGISTER, go agead 2584 * and grab the PIM REGISTER header size, to avoid another 2585 * possible m_pullup() later. 2586 * 2587 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8 2588 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28 2589 */ 2590 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN); 2591 /* 2592 * Get the IP and PIM headers in contiguous memory, and 2593 * possibly the PIM REGISTER header. 2594 */ 2595 if (m->m_len < minlen && (m = m_pullup(m, minlen)) == 0) { 2596 CTR1(KTR_IPMF, "%s: m_pullup() failed", __func__); 2597 return; 2598 } 2599 2600 /* m_pullup() may have given us a new mbuf so reset ip. */ 2601 ip = mtod(m, struct ip *); 2602 ip_tos = ip->ip_tos; 2603 2604 /* adjust mbuf to point to the PIM header */ 2605 m->m_data += iphlen; 2606 m->m_len -= iphlen; 2607 pim = mtod(m, struct pim *); 2608 2609 /* 2610 * Validate checksum. If PIM REGISTER, exclude the data packet. 2611 * 2612 * XXX: some older PIMv2 implementations don't make this distinction, 2613 * so for compatibility reason perform the checksum over part of the 2614 * message, and if error, then over the whole message. 2615 */ 2616 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) { 2617 /* do nothing, checksum okay */ 2618 } else if (in_cksum(m, datalen)) { 2619 PIMSTAT_INC(pims_rcv_badsum); 2620 CTR1(KTR_IPMF, "%s: invalid checksum", __func__); 2621 m_freem(m); 2622 return; 2623 } 2624 2625 /* PIM version check */ 2626 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) { 2627 PIMSTAT_INC(pims_rcv_badversion); 2628 CTR3(KTR_IPMF, "%s: bad version %d expect %d", __func__, 2629 (int)PIM_VT_V(pim->pim_vt), PIM_VERSION); 2630 m_freem(m); 2631 return; 2632 } 2633 2634 /* restore mbuf back to the outer IP */ 2635 m->m_data -= iphlen; 2636 m->m_len += iphlen; 2637 2638 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) { 2639 /* 2640 * Since this is a REGISTER, we'll make a copy of the register 2641 * headers ip + pim + u_int32 + encap_ip, to be passed up to the 2642 * routing daemon. 2643 */ 2644 struct sockaddr_in dst = { sizeof(dst), AF_INET }; 2645 struct mbuf *mcp; 2646 struct ip *encap_ip; 2647 u_int32_t *reghdr; 2648 struct ifnet *vifp; 2649 2650 VIF_LOCK(); 2651 if ((V_reg_vif_num >= V_numvifs) || (V_reg_vif_num == VIFI_INVALID)) { 2652 VIF_UNLOCK(); 2653 CTR2(KTR_IPMF, "%s: register vif not set: %d", __func__, 2654 (int)V_reg_vif_num); 2655 m_freem(m); 2656 return; 2657 } 2658 /* XXX need refcnt? */ 2659 vifp = V_viftable[V_reg_vif_num].v_ifp; 2660 VIF_UNLOCK(); 2661 2662 /* 2663 * Validate length 2664 */ 2665 if (datalen < PIM_REG_MINLEN) { 2666 PIMSTAT_INC(pims_rcv_tooshort); 2667 PIMSTAT_INC(pims_rcv_badregisters); 2668 CTR1(KTR_IPMF, "%s: register packet size too small", __func__); 2669 m_freem(m); 2670 return; 2671 } 2672 2673 reghdr = (u_int32_t *)(pim + 1); 2674 encap_ip = (struct ip *)(reghdr + 1); 2675 2676 CTR3(KTR_IPMF, "%s: register: encap ip src %s len %d", 2677 __func__, inet_ntoa(encap_ip->ip_src), ntohs(encap_ip->ip_len)); 2678 2679 /* verify the version number of the inner packet */ 2680 if (encap_ip->ip_v != IPVERSION) { 2681 PIMSTAT_INC(pims_rcv_badregisters); 2682 CTR1(KTR_IPMF, "%s: bad encap ip version", __func__); 2683 m_freem(m); 2684 return; 2685 } 2686 2687 /* verify the inner packet is destined to a mcast group */ 2688 if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) { 2689 PIMSTAT_INC(pims_rcv_badregisters); 2690 CTR2(KTR_IPMF, "%s: bad encap ip dest %s", __func__, 2691 inet_ntoa(encap_ip->ip_dst)); 2692 m_freem(m); 2693 return; 2694 } 2695 2696 /* If a NULL_REGISTER, pass it to the daemon */ 2697 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 2698 goto pim_input_to_daemon; 2699 2700 /* 2701 * Copy the TOS from the outer IP header to the inner IP header. 2702 */ 2703 if (encap_ip->ip_tos != ip_tos) { 2704 /* Outer TOS -> inner TOS */ 2705 encap_ip->ip_tos = ip_tos; 2706 /* Recompute the inner header checksum. Sigh... */ 2707 2708 /* adjust mbuf to point to the inner IP header */ 2709 m->m_data += (iphlen + PIM_MINLEN); 2710 m->m_len -= (iphlen + PIM_MINLEN); 2711 2712 encap_ip->ip_sum = 0; 2713 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2); 2714 2715 /* restore mbuf to point back to the outer IP header */ 2716 m->m_data -= (iphlen + PIM_MINLEN); 2717 m->m_len += (iphlen + PIM_MINLEN); 2718 } 2719 2720 /* 2721 * Decapsulate the inner IP packet and loopback to forward it 2722 * as a normal multicast packet. Also, make a copy of the 2723 * outer_iphdr + pimhdr + reghdr + encap_iphdr 2724 * to pass to the daemon later, so it can take the appropriate 2725 * actions (e.g., send back PIM_REGISTER_STOP). 2726 * XXX: here m->m_data points to the outer IP header. 2727 */ 2728 mcp = m_copy(m, 0, iphlen + PIM_REG_MINLEN); 2729 if (mcp == NULL) { 2730 CTR1(KTR_IPMF, "%s: m_copy() failed", __func__); 2731 m_freem(m); 2732 return; 2733 } 2734 2735 /* Keep statistics */ 2736 /* XXX: registers_bytes include only the encap. mcast pkt */ 2737 PIMSTAT_INC(pims_rcv_registers_msgs); 2738 PIMSTAT_ADD(pims_rcv_registers_bytes, ntohs(encap_ip->ip_len)); 2739 2740 /* 2741 * forward the inner ip packet; point m_data at the inner ip. 2742 */ 2743 m_adj(m, iphlen + PIM_MINLEN); 2744 2745 CTR4(KTR_IPMF, 2746 "%s: forward decap'd REGISTER: src %lx dst %lx vif %d", 2747 __func__, 2748 (u_long)ntohl(encap_ip->ip_src.s_addr), 2749 (u_long)ntohl(encap_ip->ip_dst.s_addr), 2750 (int)V_reg_vif_num); 2751 2752 /* NB: vifp was collected above; can it change on us? */ 2753 if_simloop(vifp, m, dst.sin_family, 0); 2754 2755 /* prepare the register head to send to the mrouting daemon */ 2756 m = mcp; 2757 } 2758 2759pim_input_to_daemon: 2760 /* 2761 * Pass the PIM message up to the daemon; if it is a Register message, 2762 * pass the 'head' only up to the daemon. This includes the 2763 * outer IP header, PIM header, PIM-Register header and the 2764 * inner IP header. 2765 * XXX: the outer IP header pkt size of a Register is not adjust to 2766 * reflect the fact that the inner multicast data is truncated. 2767 */ 2768 rip_input(m, iphlen); 2769 2770 return; 2771} 2772 2773static int 2774sysctl_mfctable(SYSCTL_HANDLER_ARGS) 2775{ 2776 struct mfc *rt; 2777 int error, i; 2778 2779 if (req->newptr) 2780 return (EPERM); 2781 if (V_mfchashtbl == NULL) /* XXX unlocked */ 2782 return (0); 2783 error = sysctl_wire_old_buffer(req, 0); 2784 if (error) 2785 return (error); 2786 2787 MFC_LOCK(); 2788 for (i = 0; i < mfchashsize; i++) { 2789 LIST_FOREACH(rt, &V_mfchashtbl[i], mfc_hash) { 2790 error = SYSCTL_OUT(req, rt, sizeof(struct mfc)); 2791 if (error) 2792 goto out_locked; 2793 } 2794 } 2795out_locked: 2796 MFC_UNLOCK(); 2797 return (error); 2798} 2799 2800static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mfctable, CTLFLAG_RD, 2801 sysctl_mfctable, "IPv4 Multicast Forwarding Table " 2802 "(struct *mfc[mfchashsize], netinet/ip_mroute.h)"); 2803 2804static void 2805vnet_mroute_init(const void *unused __unused) 2806{ 2807 2808 MALLOC(V_nexpire, u_char *, mfchashsize, M_MRTABLE, M_WAITOK|M_ZERO); 2809 bzero(V_bw_meter_timers, sizeof(V_bw_meter_timers)); 2810 callout_init(&V_expire_upcalls_ch, 1); 2811 callout_init(&V_bw_upcalls_ch, 1); 2812 callout_init(&V_bw_meter_ch, 1); 2813} 2814 2815VNET_SYSINIT(vnet_mroute_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mroute_init, 2816 NULL); 2817 2818static void 2819vnet_mroute_uninit(const void *unused __unused) 2820{ 2821 2822 FREE(V_nexpire, M_MRTABLE); 2823 V_nexpire = NULL; 2824} 2825 2826VNET_SYSUNINIT(vnet_mroute_uninit, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, 2827 vnet_mroute_uninit, NULL); 2828 2829static int 2830ip_mroute_modevent(module_t mod, int type, void *unused) 2831{ 2832 2833 switch (type) { 2834 case MOD_LOAD: 2835 MROUTER_LOCK_INIT(); 2836 2837 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2838 if_detached_event, NULL, EVENTHANDLER_PRI_ANY); 2839 if (if_detach_event_tag == NULL) { 2840 printf("ip_mroute: unable to register " 2841 "ifnet_departure_event handler\n"); 2842 MROUTER_LOCK_DESTROY(); 2843 return (EINVAL); 2844 } 2845 2846 MFC_LOCK_INIT(); 2847 VIF_LOCK_INIT(); 2848 2849 mfchashsize = MFCHASHSIZE; 2850 if (TUNABLE_ULONG_FETCH("net.inet.ip.mfchashsize", &mfchashsize) && 2851 !powerof2(mfchashsize)) { 2852 printf("WARNING: %s not a power of 2; using default\n", 2853 "net.inet.ip.mfchashsize"); 2854 mfchashsize = MFCHASHSIZE; 2855 } 2856 2857 pim_squelch_wholepkt = 0; 2858 TUNABLE_ULONG_FETCH("net.inet.pim.squelch_wholepkt", 2859 &pim_squelch_wholepkt); 2860 2861 pim_encap_cookie = encap_attach_func(AF_INET, IPPROTO_PIM, 2862 pim_encapcheck, &in_pim_protosw, NULL); 2863 if (pim_encap_cookie == NULL) { 2864 printf("ip_mroute: unable to attach pim encap\n"); 2865 VIF_LOCK_DESTROY(); 2866 MFC_LOCK_DESTROY(); 2867 MROUTER_LOCK_DESTROY(); 2868 return (EINVAL); 2869 } 2870 2871 ip_mcast_src = X_ip_mcast_src; 2872 ip_mforward = X_ip_mforward; 2873 ip_mrouter_done = X_ip_mrouter_done; 2874 ip_mrouter_get = X_ip_mrouter_get; 2875 ip_mrouter_set = X_ip_mrouter_set; 2876 2877 ip_rsvp_force_done = X_ip_rsvp_force_done; 2878 ip_rsvp_vif = X_ip_rsvp_vif; 2879 2880 legal_vif_num = X_legal_vif_num; 2881 mrt_ioctl = X_mrt_ioctl; 2882 rsvp_input_p = X_rsvp_input; 2883 break; 2884 2885 case MOD_UNLOAD: 2886 /* 2887 * Typically module unload happens after the user-level 2888 * process has shutdown the kernel services (the check 2889 * below insures someone can't just yank the module out 2890 * from under a running process). But if the module is 2891 * just loaded and then unloaded w/o starting up a user 2892 * process we still need to cleanup. 2893 */ 2894 MROUTER_LOCK(); 2895 if (ip_mrouter_cnt != 0) { 2896 MROUTER_UNLOCK(); 2897 return (EINVAL); 2898 } 2899 ip_mrouter_unloading = 1; 2900 MROUTER_UNLOCK(); 2901 2902 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2903 2904 if (pim_encap_cookie) { 2905 encap_detach(pim_encap_cookie); 2906 pim_encap_cookie = NULL; 2907 } 2908 2909 ip_mcast_src = NULL; 2910 ip_mforward = NULL; 2911 ip_mrouter_done = NULL; 2912 ip_mrouter_get = NULL; 2913 ip_mrouter_set = NULL; 2914 2915 ip_rsvp_force_done = NULL; 2916 ip_rsvp_vif = NULL; 2917 2918 legal_vif_num = NULL; 2919 mrt_ioctl = NULL; 2920 rsvp_input_p = NULL; 2921 2922 VIF_LOCK_DESTROY(); 2923 MFC_LOCK_DESTROY(); 2924 MROUTER_LOCK_DESTROY(); 2925 break; 2926 2927 default: 2928 return EOPNOTSUPP; 2929 } 2930 return 0; 2931} 2932 2933static moduledata_t ip_mroutemod = { 2934 "ip_mroute", 2935 ip_mroute_modevent, 2936 0 2937}; 2938 2939DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE); 2940