ip_mroute.c revision 41591
1/* 2 * IP multicast forwarding procedures 3 * 4 * Written by David Waitzman, BBN Labs, August 1988. 5 * Modified by Steve Deering, Stanford, February 1989. 6 * Modified by Mark J. Steiglitz, Stanford, May, 1991 7 * Modified by Van Jacobson, LBL, January 1993 8 * Modified by Ajit Thyagarajan, PARC, August 1993 9 * Modified by Bill Fenner, PARC, April 1995 10 * 11 * MROUTING Revision: 3.5 12 * $Id: ip_mroute.c,v 1.49 1998/08/23 03:07:14 wollman Exp $ 13 */ 14 15#include "opt_mrouting.h" 16 17#include <sys/param.h> 18#include <sys/systm.h> 19#include <sys/mbuf.h> 20#include <sys/socket.h> 21#include <sys/socketvar.h> 22#include <sys/protosw.h> 23#include <sys/time.h> 24#include <sys/kernel.h> 25#include <sys/sockio.h> 26#include <sys/syslog.h> 27#include <net/if.h> 28#include <net/route.h> 29#include <netinet/in.h> 30#include <netinet/in_systm.h> 31#include <netinet/ip.h> 32#include <netinet/ip_var.h> 33#include <netinet/in_var.h> 34#include <netinet/igmp.h> 35#include <netinet/ip_mroute.h> 36#include <netinet/udp.h> 37 38#ifndef NTOHL 39#if BYTE_ORDER != BIG_ENDIAN 40#define NTOHL(d) ((d) = ntohl((d))) 41#define NTOHS(d) ((d) = ntohs((u_short)(d))) 42#define HTONL(d) ((d) = htonl((d))) 43#define HTONS(d) ((d) = htons((u_short)(d))) 44#else 45#define NTOHL(d) 46#define NTOHS(d) 47#define HTONL(d) 48#define HTONS(d) 49#endif 50#endif 51 52#ifndef MROUTING 53extern u_long _ip_mcast_src __P((int vifi)); 54extern int _ip_mforward __P((struct ip *ip, struct ifnet *ifp, 55 struct mbuf *m, struct ip_moptions *imo)); 56extern int _ip_mrouter_done __P((void)); 57extern int _ip_mrouter_get __P((struct socket *so, struct sockopt *sopt)); 58extern int _ip_mrouter_set __P((struct socket *so, struct sockopt *sopt)); 59extern int _mrt_ioctl __P((int req, caddr_t data, struct proc *p)); 60 61/* 62 * Dummy routines and globals used when multicast routing is not compiled in. 63 */ 64 65struct socket *ip_mrouter = NULL; 66static u_int ip_mrtproto = 0; 67static struct mrtstat mrtstat; 68u_int rsvpdebug = 0; 69 70int 71_ip_mrouter_set(so, sopt) 72 struct socket *so; 73 struct sockopt *sopt; 74{ 75 return(EOPNOTSUPP); 76} 77 78int (*ip_mrouter_set)(struct socket *, struct sockopt *) = _ip_mrouter_set; 79 80 81int 82_ip_mrouter_get(so, sopt) 83 struct socket *so; 84 struct sockopt *sopt; 85{ 86 return(EOPNOTSUPP); 87} 88 89int (*ip_mrouter_get)(struct socket *, struct sockopt *) = _ip_mrouter_get; 90 91int 92_ip_mrouter_done() 93{ 94 return(0); 95} 96 97int (*ip_mrouter_done)(void) = _ip_mrouter_done; 98 99int 100_ip_mforward(ip, ifp, m, imo) 101 struct ip *ip; 102 struct ifnet *ifp; 103 struct mbuf *m; 104 struct ip_moptions *imo; 105{ 106 return(0); 107} 108 109int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 110 struct ip_moptions *) = _ip_mforward; 111 112int 113_mrt_ioctl(int req, caddr_t data, struct proc *p) 114{ 115 return EOPNOTSUPP; 116} 117 118int (*mrt_ioctl)(int, caddr_t, struct proc *) = _mrt_ioctl; 119 120void 121rsvp_input(m, iphlen) /* XXX must fixup manually */ 122 struct mbuf *m; 123 int iphlen; 124{ 125 /* Can still get packets with rsvp_on = 0 if there is a local member 126 * of the group to which the RSVP packet is addressed. But in this 127 * case we want to throw the packet away. 128 */ 129 if (!rsvp_on) { 130 m_freem(m); 131 return; 132 } 133 134 if (ip_rsvpd != NULL) { 135 if (rsvpdebug) 136 printf("rsvp_input: Sending packet up old-style socket\n"); 137 rip_input(m, iphlen); 138 return; 139 } 140 /* Drop the packet */ 141 m_freem(m); 142} 143 144void ipip_input(struct mbuf *m, int iphlen) { /* XXX must fixup manually */ 145 rip_input(m, iphlen); 146} 147 148int (*legal_vif_num)(int) = 0; 149 150/* 151 * This should never be called, since IP_MULTICAST_VIF should fail, but 152 * just in case it does get called, the code a little lower in ip_output 153 * will assign the packet a local address. 154 */ 155u_long 156_ip_mcast_src(int vifi) { return INADDR_ANY; } 157u_long (*ip_mcast_src)(int) = _ip_mcast_src; 158 159int 160ip_rsvp_vif_init(so, sopt) 161 struct socket *so; 162 struct sockopt *sopt; 163{ 164 return(EINVAL); 165} 166 167int 168ip_rsvp_vif_done(so, sopt) 169 struct socket *so; 170 struct sockopt *sopt; 171{ 172 return(EINVAL); 173} 174 175void 176ip_rsvp_force_done(so) 177 struct socket *so; 178{ 179 return; 180} 181 182#else /* MROUTING */ 183 184#define M_HASCL(m) ((m)->m_flags & M_EXT) 185 186#define INSIZ sizeof(struct in_addr) 187#define same(a1, a2) \ 188 (bcmp((caddr_t)(a1), (caddr_t)(a2), INSIZ) == 0) 189 190#define MT_MRTABLE MT_RTABLE /* since nothing else uses it */ 191 192/* 193 * Globals. All but ip_mrouter and ip_mrtproto could be static, 194 * except for netstat or debugging purposes. 195 */ 196#ifndef MROUTE_LKM 197struct socket *ip_mrouter = NULL; 198static struct mrtstat mrtstat; 199 200static int ip_mrtproto = IGMP_DVMRP; /* for netstat only */ 201#else /* MROUTE_LKM */ 202extern void X_ipip_input __P((struct mbuf *m, int iphlen)); 203extern struct mrtstat mrtstat; 204static int ip_mrtproto; 205#endif 206 207#define NO_RTE_FOUND 0x1 208#define RTE_FOUND 0x2 209 210static struct mbuf *mfctable[MFCTBLSIZ]; 211static u_char nexpire[MFCTBLSIZ]; 212static struct vif viftable[MAXVIFS]; 213static u_int mrtdebug = 0; /* debug level */ 214#define DEBUG_MFC 0x02 215#define DEBUG_FORWARD 0x04 216#define DEBUG_EXPIRE 0x08 217#define DEBUG_XMIT 0x10 218static u_int tbfdebug = 0; /* tbf debug level */ 219static u_int rsvpdebug = 0; /* rsvp debug level */ 220 221static struct callout_handle expire_upcalls_ch; 222 223#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 224#define UPCALL_EXPIRE 6 /* number of timeouts */ 225 226/* 227 * Define the token bucket filter structures 228 * tbftable -> each vif has one of these for storing info 229 */ 230 231static struct tbf tbftable[MAXVIFS]; 232#define TBF_REPROCESS (hz / 100) /* 100x / second */ 233 234/* 235 * 'Interfaces' associated with decapsulator (so we can tell 236 * packets that went through it from ones that get reflected 237 * by a broken gateway). These interfaces are never linked into 238 * the system ifnet list & no routes point to them. I.e., packets 239 * can't be sent this way. They only exist as a placeholder for 240 * multicast source verification. 241 */ 242static struct ifnet multicast_decap_if[MAXVIFS]; 243 244#define ENCAP_TTL 64 245#define ENCAP_PROTO IPPROTO_IPIP /* 4 */ 246 247/* prototype IP hdr for encapsulated packets */ 248static struct ip multicast_encap_iphdr = { 249#if BYTE_ORDER == LITTLE_ENDIAN 250 sizeof(struct ip) >> 2, IPVERSION, 251#else 252 IPVERSION, sizeof(struct ip) >> 2, 253#endif 254 0, /* tos */ 255 sizeof(struct ip), /* total length */ 256 0, /* id */ 257 0, /* frag offset */ 258 ENCAP_TTL, ENCAP_PROTO, 259 0, /* checksum */ 260}; 261 262/* 263 * Private variables. 264 */ 265static vifi_t numvifs = 0; 266static int have_encap_tunnel = 0; 267 268/* 269 * one-back cache used by ipip_input to locate a tunnel's vif 270 * given a datagram's src ip address. 271 */ 272static u_long last_encap_src; 273static struct vif *last_encap_vif; 274 275static u_long X_ip_mcast_src __P((int vifi)); 276static int X_ip_mforward __P((struct ip *ip, struct ifnet *ifp, struct mbuf *m, struct ip_moptions *imo)); 277static int X_ip_mrouter_done __P((void)); 278static int X_ip_mrouter_get __P((struct socket *so, struct sockopt *m)); 279static int X_ip_mrouter_set __P((struct socket *so, struct sockopt *m)); 280static int X_legal_vif_num __P((int vif)); 281static int X_mrt_ioctl __P((int cmd, caddr_t data)); 282 283static int get_sg_cnt(struct sioc_sg_req *); 284static int get_vif_cnt(struct sioc_vif_req *); 285static int ip_mrouter_init(struct socket *, int); 286static int add_vif(struct vifctl *); 287static int del_vif(vifi_t); 288static int add_mfc(struct mfcctl *); 289static int del_mfc(struct mfcctl *); 290static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *); 291static int set_assert(int); 292static void expire_upcalls(void *); 293static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, 294 vifi_t); 295static void phyint_send(struct ip *, struct vif *, struct mbuf *); 296static void encap_send(struct ip *, struct vif *, struct mbuf *); 297static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long); 298static void tbf_queue(struct vif *, struct mbuf *); 299static void tbf_process_q(struct vif *); 300static void tbf_reprocess_q(void *); 301static int tbf_dq_sel(struct vif *, struct ip *); 302static void tbf_send_packet(struct vif *, struct mbuf *); 303static void tbf_update_tokens(struct vif *); 304static int priority(struct vif *, struct ip *); 305void multiencap_decap(struct mbuf *); 306 307/* 308 * whether or not special PIM assert processing is enabled. 309 */ 310static int pim_assert; 311/* 312 * Rate limit for assert notification messages, in usec 313 */ 314#define ASSERT_MSG_TIME 3000000 315 316/* 317 * Hash function for a source, group entry 318 */ 319#define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \ 320 ((g) >> 20) ^ ((g) >> 10) ^ (g)) 321 322/* 323 * Find a route for a given origin IP address and Multicast group address 324 * Type of service parameter to be added in the future!!! 325 */ 326 327#define MFCFIND(o, g, rt) { \ 328 register struct mbuf *_mb_rt = mfctable[MFCHASH(o,g)]; \ 329 register struct mfc *_rt = NULL; \ 330 rt = NULL; \ 331 ++mrtstat.mrts_mfc_lookups; \ 332 while (_mb_rt) { \ 333 _rt = mtod(_mb_rt, struct mfc *); \ 334 if ((_rt->mfc_origin.s_addr == o) && \ 335 (_rt->mfc_mcastgrp.s_addr == g) && \ 336 (_mb_rt->m_act == NULL)) { \ 337 rt = _rt; \ 338 break; \ 339 } \ 340 _mb_rt = _mb_rt->m_next; \ 341 } \ 342 if (rt == NULL) { \ 343 ++mrtstat.mrts_mfc_misses; \ 344 } \ 345} 346 347 348/* 349 * Macros to compute elapsed time efficiently 350 * Borrowed from Van Jacobson's scheduling code 351 */ 352#define TV_DELTA(a, b, delta) { \ 353 register int xxs; \ 354 \ 355 delta = (a).tv_usec - (b).tv_usec; \ 356 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 357 switch (xxs) { \ 358 case 2: \ 359 delta += 1000000; \ 360 /* fall through */ \ 361 case 1: \ 362 delta += 1000000; \ 363 break; \ 364 default: \ 365 delta += (1000000 * xxs); \ 366 } \ 367 } \ 368} 369 370#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 371 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 372 373#ifdef UPCALL_TIMING 374u_long upcall_data[51]; 375static void collate(struct timeval *); 376#endif /* UPCALL_TIMING */ 377 378 379/* 380 * Handle MRT setsockopt commands to modify the multicast routing tables. 381 */ 382static int 383X_ip_mrouter_set(so, sopt) 384 struct socket *so; 385 struct sockopt *sopt; 386{ 387 int error, optval; 388 vifi_t vifi; 389 struct vifctl vifc; 390 struct mfcctl mfc; 391 392 if (so != ip_mrouter && sopt->sopt_name != MRT_INIT) 393 return (EPERM); 394 395 error = 0; 396 switch (sopt->sopt_name) { 397 case MRT_INIT: 398 error = sooptcopyin(sopt, &optval, sizeof optval, 399 sizeof optval); 400 if (error) 401 break; 402 error = ip_mrouter_init(so, optval); 403 break; 404 405 case MRT_DONE: 406 error = ip_mrouter_done(); 407 break; 408 409 case MRT_ADD_VIF: 410 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc); 411 if (error) 412 break; 413 error = add_vif(&vifc); 414 break; 415 416 case MRT_DEL_VIF: 417 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi); 418 if (error) 419 break; 420 error = del_vif(vifi); 421 break; 422 423 case MRT_ADD_MFC: 424 case MRT_DEL_MFC: 425 error = sooptcopyin(sopt, &mfc, sizeof mfc, sizeof mfc); 426 if (error) 427 break; 428 if (sopt->sopt_name == MRT_ADD_MFC) 429 error = add_mfc(&mfc); 430 else 431 error = del_mfc(&mfc); 432 433 case MRT_ASSERT: 434 error = sooptcopyin(sopt, &optval, sizeof optval, 435 sizeof optval); 436 if (error) 437 break; 438 set_assert(optval); 439 440 default: 441 error = EOPNOTSUPP; 442 break; 443 } 444 return (error); 445} 446 447#ifndef MROUTE_LKM 448int (*ip_mrouter_set)(struct socket *, struct sockopt *) = X_ip_mrouter_set; 449#endif 450 451/* 452 * Handle MRT getsockopt commands 453 */ 454static int 455X_ip_mrouter_get(so, sopt) 456 struct socket *so; 457 struct sockopt *sopt; 458{ 459 int error; 460 static int version = 0x0305; /* !!! why is this here? XXX */ 461 462 switch (sopt->sopt_name) { 463 case MRT_VERSION: 464 error = sooptcopyout(sopt, &version, sizeof version); 465 break; 466 467 case MRT_ASSERT: 468 error = sooptcopyout(sopt, &pim_assert, sizeof pim_assert); 469 break; 470 default: 471 error = EOPNOTSUPP; 472 break; 473 } 474 return (error); 475} 476 477#ifndef MROUTE_LKM 478int (*ip_mrouter_get)(struct socket *, struct sockopt *) = X_ip_mrouter_get; 479#endif 480 481/* 482 * Handle ioctl commands to obtain information from the cache 483 */ 484static int 485X_mrt_ioctl(cmd, data) 486 int cmd; 487 caddr_t data; 488{ 489 int error = 0; 490 491 switch (cmd) { 492 case (SIOCGETVIFCNT): 493 return (get_vif_cnt((struct sioc_vif_req *)data)); 494 break; 495 case (SIOCGETSGCNT): 496 return (get_sg_cnt((struct sioc_sg_req *)data)); 497 break; 498 default: 499 return (EINVAL); 500 break; 501 } 502 return error; 503} 504 505#ifndef MROUTE_LKM 506int (*mrt_ioctl)(int, caddr_t) = X_mrt_ioctl; 507#endif 508 509/* 510 * returns the packet, byte, rpf-failure count for the source group provided 511 */ 512static int 513get_sg_cnt(req) 514 register struct sioc_sg_req *req; 515{ 516 register struct mfc *rt; 517 int s; 518 519 s = splnet(); 520 MFCFIND(req->src.s_addr, req->grp.s_addr, rt); 521 splx(s); 522 if (rt != NULL) { 523 req->pktcnt = rt->mfc_pkt_cnt; 524 req->bytecnt = rt->mfc_byte_cnt; 525 req->wrong_if = rt->mfc_wrong_if; 526 } else 527 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 528 529 return 0; 530} 531 532/* 533 * returns the input and output packet and byte counts on the vif provided 534 */ 535static int 536get_vif_cnt(req) 537 register struct sioc_vif_req *req; 538{ 539 register vifi_t vifi = req->vifi; 540 541 if (vifi >= numvifs) return EINVAL; 542 543 req->icount = viftable[vifi].v_pkt_in; 544 req->ocount = viftable[vifi].v_pkt_out; 545 req->ibytes = viftable[vifi].v_bytes_in; 546 req->obytes = viftable[vifi].v_bytes_out; 547 548 return 0; 549} 550 551/* 552 * Enable multicast routing 553 */ 554static int 555ip_mrouter_init(so, version) 556 struct socket *so; 557 int version; 558{ 559 if (mrtdebug) 560 log(LOG_DEBUG,"ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 561 so->so_type, so->so_proto->pr_protocol); 562 563 if (so->so_type != SOCK_RAW || 564 so->so_proto->pr_protocol != IPPROTO_IGMP) return EOPNOTSUPP; 565 566 if (version != 1) 567 return ENOPROTOOPT; 568 569 if (ip_mrouter != NULL) return EADDRINUSE; 570 571 ip_mrouter = so; 572 573 bzero((caddr_t)mfctable, sizeof(mfctable)); 574 bzero((caddr_t)nexpire, sizeof(nexpire)); 575 576 pim_assert = 0; 577 578 expire_upcalls_ch = timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 579 580 if (mrtdebug) 581 log(LOG_DEBUG, "ip_mrouter_init\n"); 582 583 return 0; 584} 585 586/* 587 * Disable multicast routing 588 */ 589static int 590X_ip_mrouter_done() 591{ 592 vifi_t vifi; 593 int i; 594 struct ifnet *ifp; 595 struct ifreq ifr; 596 struct mbuf *mb_rt; 597 struct mbuf *m; 598 struct rtdetq *rte; 599 int s; 600 601 s = splnet(); 602 603 /* 604 * For each phyint in use, disable promiscuous reception of all IP 605 * multicasts. 606 */ 607 for (vifi = 0; vifi < numvifs; vifi++) { 608 if (viftable[vifi].v_lcl_addr.s_addr != 0 && 609 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 610 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 611 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr 612 = INADDR_ANY; 613 ifp = viftable[vifi].v_ifp; 614 if_allmulti(ifp, 0); 615 } 616 } 617 bzero((caddr_t)tbftable, sizeof(tbftable)); 618 bzero((caddr_t)viftable, sizeof(viftable)); 619 numvifs = 0; 620 pim_assert = 0; 621 622 untimeout(expire_upcalls, (caddr_t)NULL, expire_upcalls_ch); 623 624 /* 625 * Free all multicast forwarding cache entries. 626 */ 627 for (i = 0; i < MFCTBLSIZ; i++) { 628 mb_rt = mfctable[i]; 629 while (mb_rt) { 630 if (mb_rt->m_act != NULL) { 631 while (mb_rt->m_act) { 632 m = mb_rt->m_act; 633 mb_rt->m_act = m->m_act; 634 rte = mtod(m, struct rtdetq *); 635 m_freem(rte->m); 636 m_free(m); 637 } 638 } 639 mb_rt = m_free(mb_rt); 640 } 641 } 642 643 bzero((caddr_t)mfctable, sizeof(mfctable)); 644 645 /* 646 * Reset de-encapsulation cache 647 */ 648 last_encap_src = 0; 649 last_encap_vif = NULL; 650 have_encap_tunnel = 0; 651 652 ip_mrouter = NULL; 653 654 splx(s); 655 656 if (mrtdebug) 657 log(LOG_DEBUG, "ip_mrouter_done\n"); 658 659 return 0; 660} 661 662#ifndef MROUTE_LKM 663int (*ip_mrouter_done)(void) = X_ip_mrouter_done; 664#endif 665 666/* 667 * Set PIM assert processing global 668 */ 669static int 670set_assert(i) 671 int i; 672{ 673 if ((i != 1) && (i != 0)) 674 return EINVAL; 675 676 pim_assert = i; 677 678 return 0; 679} 680 681/* 682 * Add a vif to the vif table 683 */ 684static int 685add_vif(vifcp) 686 register struct vifctl *vifcp; 687{ 688 register struct vif *vifp = viftable + vifcp->vifc_vifi; 689 static struct sockaddr_in sin = {sizeof sin, AF_INET}; 690 struct ifaddr *ifa; 691 struct ifnet *ifp; 692 int error, s; 693 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi; 694 695 if (vifcp->vifc_vifi >= MAXVIFS) return EINVAL; 696 if (vifp->v_lcl_addr.s_addr != 0) return EADDRINUSE; 697 698 /* Find the interface with an address in AF_INET family */ 699 sin.sin_addr = vifcp->vifc_lcl_addr; 700 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 701 if (ifa == 0) return EADDRNOTAVAIL; 702 ifp = ifa->ifa_ifp; 703 704 if (vifcp->vifc_flags & VIFF_TUNNEL) { 705 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) { 706 /* 707 * An encapsulating tunnel is wanted. Tell ipip_input() to 708 * start paying attention to encapsulated packets. 709 */ 710 if (have_encap_tunnel == 0) { 711 have_encap_tunnel = 1; 712 for (s = 0; s < MAXVIFS; ++s) { 713 multicast_decap_if[s].if_name = "mdecap"; 714 multicast_decap_if[s].if_unit = s; 715 } 716 } 717 /* 718 * Set interface to fake encapsulator interface 719 */ 720 ifp = &multicast_decap_if[vifcp->vifc_vifi]; 721 /* 722 * Prepare cached route entry 723 */ 724 bzero(&vifp->v_route, sizeof(vifp->v_route)); 725 } else { 726 log(LOG_ERR, "source routed tunnels not supported\n"); 727 return EOPNOTSUPP; 728 } 729 } else { 730 /* Make sure the interface supports multicast */ 731 if ((ifp->if_flags & IFF_MULTICAST) == 0) 732 return EOPNOTSUPP; 733 734 /* Enable promiscuous reception of all IP multicasts from the if */ 735 s = splnet(); 736 error = if_allmulti(ifp, 1); 737 splx(s); 738 if (error) 739 return error; 740 } 741 742 s = splnet(); 743 /* define parameters for the tbf structure */ 744 vifp->v_tbf = v_tbf; 745 GET_TIME(vifp->v_tbf->tbf_last_pkt_t); 746 vifp->v_tbf->tbf_n_tok = 0; 747 vifp->v_tbf->tbf_q_len = 0; 748 vifp->v_tbf->tbf_max_q_len = MAXQSIZE; 749 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL; 750 751 vifp->v_flags = vifcp->vifc_flags; 752 vifp->v_threshold = vifcp->vifc_threshold; 753 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 754 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 755 vifp->v_ifp = ifp; 756 /* scaling up here allows division by 1024 in critical code */ 757 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000; 758 vifp->v_rsvp_on = 0; 759 vifp->v_rsvpd = NULL; 760 /* initialize per vif pkt counters */ 761 vifp->v_pkt_in = 0; 762 vifp->v_pkt_out = 0; 763 vifp->v_bytes_in = 0; 764 vifp->v_bytes_out = 0; 765 splx(s); 766 767 /* Adjust numvifs up if the vifi is higher than numvifs */ 768 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1; 769 770 if (mrtdebug) 771 log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n", 772 vifcp->vifc_vifi, 773 (u_long)ntohl(vifcp->vifc_lcl_addr.s_addr), 774 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 775 (u_long)ntohl(vifcp->vifc_rmt_addr.s_addr), 776 vifcp->vifc_threshold, 777 vifcp->vifc_rate_limit); 778 779 return 0; 780} 781 782/* 783 * Delete a vif from the vif table 784 */ 785static int 786del_vif(vifi) 787 vifi_t vifi; 788{ 789 register struct vif *vifp = &viftable[vifi]; 790 register struct mbuf *m; 791 struct ifnet *ifp; 792 struct ifreq ifr; 793 int s; 794 795 if (vifi >= numvifs) return EINVAL; 796 if (vifp->v_lcl_addr.s_addr == 0) return EADDRNOTAVAIL; 797 798 s = splnet(); 799 800 if (!(vifp->v_flags & VIFF_TUNNEL)) { 801 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 802 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY; 803 ifp = vifp->v_ifp; 804 if_allmulti(ifp, 0); 805 } 806 807 if (vifp == last_encap_vif) { 808 last_encap_vif = 0; 809 last_encap_src = 0; 810 } 811 812 /* 813 * Free packets queued at the interface 814 */ 815 while (vifp->v_tbf->tbf_q) { 816 m = vifp->v_tbf->tbf_q; 817 vifp->v_tbf->tbf_q = m->m_act; 818 m_freem(m); 819 } 820 821 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf))); 822 bzero((caddr_t)vifp, sizeof (*vifp)); 823 824 if (mrtdebug) 825 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs); 826 827 /* Adjust numvifs down */ 828 for (vifi = numvifs; vifi > 0; vifi--) 829 if (viftable[vifi-1].v_lcl_addr.s_addr != 0) break; 830 numvifs = vifi; 831 832 splx(s); 833 834 return 0; 835} 836 837/* 838 * Add an mfc entry 839 */ 840static int 841add_mfc(mfccp) 842 struct mfcctl *mfccp; 843{ 844 struct mfc *rt; 845 register struct mbuf *mb_rt; 846 u_long hash; 847 struct mbuf *mb_ntry; 848 struct rtdetq *rte; 849 register u_short nstl; 850 int s; 851 int i; 852 853 MFCFIND(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr, rt); 854 855 /* If an entry already exists, just update the fields */ 856 if (rt) { 857 if (mrtdebug & DEBUG_MFC) 858 log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n", 859 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 860 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 861 mfccp->mfcc_parent); 862 863 s = splnet(); 864 rt->mfc_parent = mfccp->mfcc_parent; 865 for (i = 0; i < numvifs; i++) 866 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 867 splx(s); 868 return 0; 869 } 870 871 /* 872 * Find the entry for which the upcall was made and update 873 */ 874 s = splnet(); 875 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 876 for (mb_rt = mfctable[hash], nstl = 0; mb_rt; mb_rt = mb_rt->m_next) { 877 878 rt = mtod(mb_rt, struct mfc *); 879 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 880 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) && 881 (mb_rt->m_act != NULL)) { 882 883 if (nstl++) 884 log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n", 885 "multiple kernel entries", 886 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 887 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 888 mfccp->mfcc_parent, (void *)mb_rt->m_act); 889 890 if (mrtdebug & DEBUG_MFC) 891 log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n", 892 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 893 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 894 mfccp->mfcc_parent, (void *)mb_rt->m_act); 895 896 rt->mfc_origin = mfccp->mfcc_origin; 897 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 898 rt->mfc_parent = mfccp->mfcc_parent; 899 for (i = 0; i < numvifs; i++) 900 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 901 /* initialize pkt counters per src-grp */ 902 rt->mfc_pkt_cnt = 0; 903 rt->mfc_byte_cnt = 0; 904 rt->mfc_wrong_if = 0; 905 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 906 907 rt->mfc_expire = 0; /* Don't clean this guy up */ 908 nexpire[hash]--; 909 910 /* free packets Qed at the end of this entry */ 911 while (mb_rt->m_act) { 912 mb_ntry = mb_rt->m_act; 913 rte = mtod(mb_ntry, struct rtdetq *); 914/* #ifdef RSVP_ISI */ 915 ip_mdq(rte->m, rte->ifp, rt, -1); 916/* #endif */ 917 mb_rt->m_act = mb_ntry->m_act; 918 m_freem(rte->m); 919#ifdef UPCALL_TIMING 920 collate(&(rte->t)); 921#endif /* UPCALL_TIMING */ 922 m_free(mb_ntry); 923 } 924 } 925 } 926 927 /* 928 * It is possible that an entry is being inserted without an upcall 929 */ 930 if (nstl == 0) { 931 if (mrtdebug & DEBUG_MFC) 932 log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n", 933 hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr), 934 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 935 mfccp->mfcc_parent); 936 937 for (mb_rt = mfctable[hash]; mb_rt; mb_rt = mb_rt->m_next) { 938 939 rt = mtod(mb_rt, struct mfc *); 940 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 941 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) { 942 943 rt->mfc_origin = mfccp->mfcc_origin; 944 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 945 rt->mfc_parent = mfccp->mfcc_parent; 946 for (i = 0; i < numvifs; i++) 947 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 948 /* initialize pkt counters per src-grp */ 949 rt->mfc_pkt_cnt = 0; 950 rt->mfc_byte_cnt = 0; 951 rt->mfc_wrong_if = 0; 952 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 953 if (rt->mfc_expire) 954 nexpire[hash]--; 955 rt->mfc_expire = 0; 956 } 957 } 958 if (mb_rt == NULL) { 959 /* no upcall, so make a new entry */ 960 MGET(mb_rt, M_DONTWAIT, MT_MRTABLE); 961 if (mb_rt == NULL) { 962 splx(s); 963 return ENOBUFS; 964 } 965 966 rt = mtod(mb_rt, struct mfc *); 967 968 /* insert new entry at head of hash chain */ 969 rt->mfc_origin = mfccp->mfcc_origin; 970 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 971 rt->mfc_parent = mfccp->mfcc_parent; 972 for (i = 0; i < numvifs; i++) 973 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 974 /* initialize pkt counters per src-grp */ 975 rt->mfc_pkt_cnt = 0; 976 rt->mfc_byte_cnt = 0; 977 rt->mfc_wrong_if = 0; 978 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 979 rt->mfc_expire = 0; 980 981 /* link into table */ 982 mb_rt->m_next = mfctable[hash]; 983 mfctable[hash] = mb_rt; 984 mb_rt->m_act = NULL; 985 } 986 } 987 splx(s); 988 return 0; 989} 990 991#ifdef UPCALL_TIMING 992/* 993 * collect delay statistics on the upcalls 994 */ 995static void collate(t) 996register struct timeval *t; 997{ 998 register u_long d; 999 register struct timeval tp; 1000 register u_long delta; 1001 1002 GET_TIME(tp); 1003 1004 if (TV_LT(*t, tp)) 1005 { 1006 TV_DELTA(tp, *t, delta); 1007 1008 d = delta >> 10; 1009 if (d > 50) 1010 d = 50; 1011 1012 ++upcall_data[d]; 1013 } 1014} 1015#endif /* UPCALL_TIMING */ 1016 1017/* 1018 * Delete an mfc entry 1019 */ 1020static int 1021del_mfc(mfccp) 1022 struct mfcctl *mfccp; 1023{ 1024 struct in_addr origin; 1025 struct in_addr mcastgrp; 1026 struct mfc *rt; 1027 struct mbuf *mb_rt; 1028 struct mbuf **nptr; 1029 u_long hash; 1030 int s; 1031 1032 origin = mfccp->mfcc_origin; 1033 mcastgrp = mfccp->mfcc_mcastgrp; 1034 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr); 1035 1036 if (mrtdebug & DEBUG_MFC) 1037 log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n", 1038 (u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr)); 1039 1040 s = splnet(); 1041 1042 nptr = &mfctable[hash]; 1043 while ((mb_rt = *nptr) != NULL) { 1044 rt = mtod(mb_rt, struct mfc *); 1045 if (origin.s_addr == rt->mfc_origin.s_addr && 1046 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr && 1047 mb_rt->m_act == NULL) 1048 break; 1049 1050 nptr = &mb_rt->m_next; 1051 } 1052 if (mb_rt == NULL) { 1053 splx(s); 1054 return EADDRNOTAVAIL; 1055 } 1056 1057 MFREE(mb_rt, *nptr); 1058 1059 splx(s); 1060 1061 return 0; 1062} 1063 1064/* 1065 * Send a message to mrouted on the multicast routing socket 1066 */ 1067static int 1068socket_send(s, mm, src) 1069 struct socket *s; 1070 struct mbuf *mm; 1071 struct sockaddr_in *src; 1072{ 1073 if (s) { 1074 if (sbappendaddr(&s->so_rcv, 1075 (struct sockaddr *)src, 1076 mm, (struct mbuf *)0) != 0) { 1077 sorwakeup(s); 1078 return 0; 1079 } 1080 } 1081 m_freem(mm); 1082 return -1; 1083} 1084 1085/* 1086 * IP multicast forwarding function. This function assumes that the packet 1087 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1088 * pointed to by "ifp", and the packet is to be relayed to other networks 1089 * that have members of the packet's destination IP multicast group. 1090 * 1091 * The packet is returned unscathed to the caller, unless it is 1092 * erroneous, in which case a non-zero return value tells the caller to 1093 * discard it. 1094 */ 1095 1096#define IP_HDR_LEN 20 /* # bytes of fixed IP header (excluding options) */ 1097#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1098 1099static int 1100X_ip_mforward(ip, ifp, m, imo) 1101 register struct ip *ip; 1102 struct ifnet *ifp; 1103 struct mbuf *m; 1104 struct ip_moptions *imo; 1105{ 1106 register struct mfc *rt; 1107 register u_char *ipoptions; 1108 static struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1109 static int srctun = 0; 1110 register struct mbuf *mm; 1111 int s; 1112 vifi_t vifi; 1113 struct vif *vifp; 1114 1115 if (mrtdebug & DEBUG_FORWARD) 1116 log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n", 1117 (u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), 1118 (void *)ifp); 1119 1120 if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 || 1121 (ipoptions = (u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1122 /* 1123 * Packet arrived via a physical interface or 1124 * an encapsulated tunnel. 1125 */ 1126 } else { 1127 /* 1128 * Packet arrived through a source-route tunnel. 1129 * Source-route tunnels are no longer supported. 1130 */ 1131 if ((srctun++ % 1000) == 0) 1132 log(LOG_ERR, 1133 "ip_mforward: received source-routed packet from %lx\n", 1134 (u_long)ntohl(ip->ip_src.s_addr)); 1135 1136 return 1; 1137 } 1138 1139 if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) { 1140 if (ip->ip_ttl < 255) 1141 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1142 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1143 vifp = viftable + vifi; 1144 printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s%d)\n", 1145 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), vifi, 1146 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1147 vifp->v_ifp->if_name, vifp->v_ifp->if_unit); 1148 } 1149 return (ip_mdq(m, ifp, NULL, vifi)); 1150 } 1151 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1152 printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n", 1153 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr)); 1154 if(!imo) 1155 printf("In fact, no options were specified at all\n"); 1156 } 1157 1158 /* 1159 * Don't forward a packet with time-to-live of zero or one, 1160 * or a packet destined to a local-only group. 1161 */ 1162 if (ip->ip_ttl <= 1 || 1163 ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP) 1164 return 0; 1165 1166 /* 1167 * Determine forwarding vifs from the forwarding cache table 1168 */ 1169 s = splnet(); 1170 MFCFIND(ip->ip_src.s_addr, ip->ip_dst.s_addr, rt); 1171 1172 /* Entry exists, so forward if necessary */ 1173 if (rt != NULL) { 1174 splx(s); 1175 return (ip_mdq(m, ifp, rt, -1)); 1176 } else { 1177 /* 1178 * If we don't have a route for packet's origin, 1179 * Make a copy of the packet & 1180 * send message to routing daemon 1181 */ 1182 1183 register struct mbuf *mb_rt; 1184 register struct mbuf *mb_ntry; 1185 register struct mbuf *mb0; 1186 register struct rtdetq *rte; 1187 register struct mbuf *rte_m; 1188 register u_long hash; 1189 register int npkts; 1190 int hlen = ip->ip_hl << 2; 1191#ifdef UPCALL_TIMING 1192 struct timeval tp; 1193 1194 GET_TIME(tp); 1195#endif 1196 1197 mrtstat.mrts_no_route++; 1198 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1199 log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n", 1200 (u_long)ntohl(ip->ip_src.s_addr), 1201 (u_long)ntohl(ip->ip_dst.s_addr)); 1202 1203 /* 1204 * Allocate mbufs early so that we don't do extra work if we are 1205 * just going to fail anyway. Make sure to pullup the header so 1206 * that other people can't step on it. 1207 */ 1208 MGET(mb_ntry, M_DONTWAIT, MT_DATA); 1209 if (mb_ntry == NULL) { 1210 splx(s); 1211 return ENOBUFS; 1212 } 1213 mb0 = m_copy(m, 0, M_COPYALL); 1214 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen)) 1215 mb0 = m_pullup(mb0, hlen); 1216 if (mb0 == NULL) { 1217 m_free(mb_ntry); 1218 splx(s); 1219 return ENOBUFS; 1220 } 1221 1222 /* is there an upcall waiting for this packet? */ 1223 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1224 for (mb_rt = mfctable[hash]; mb_rt; mb_rt = mb_rt->m_next) { 1225 rt = mtod(mb_rt, struct mfc *); 1226 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) && 1227 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) && 1228 (mb_rt->m_act != NULL)) 1229 break; 1230 } 1231 1232 if (mb_rt == NULL) { 1233 int i; 1234 struct igmpmsg *im; 1235 1236 /* no upcall, so make a new entry */ 1237 MGET(mb_rt, M_DONTWAIT, MT_MRTABLE); 1238 if (mb_rt == NULL) { 1239 m_free(mb_ntry); 1240 m_freem(mb0); 1241 splx(s); 1242 return ENOBUFS; 1243 } 1244 /* Make a copy of the header to send to the user level process */ 1245 mm = m_copy(mb0, 0, hlen); 1246 if (mm == NULL) { 1247 m_free(mb_ntry); 1248 m_freem(mb0); 1249 m_free(mb_rt); 1250 splx(s); 1251 return ENOBUFS; 1252 } 1253 1254 /* 1255 * Send message to routing daemon to install 1256 * a route into the kernel table 1257 */ 1258 k_igmpsrc.sin_addr = ip->ip_src; 1259 1260 im = mtod(mm, struct igmpmsg *); 1261 im->im_msgtype = IGMPMSG_NOCACHE; 1262 im->im_mbz = 0; 1263 1264 mrtstat.mrts_upcalls++; 1265 1266 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1267 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n"); 1268 ++mrtstat.mrts_upq_sockfull; 1269 m_free(mb_ntry); 1270 m_freem(mb0); 1271 m_free(mb_rt); 1272 splx(s); 1273 return ENOBUFS; 1274 } 1275 1276 rt = mtod(mb_rt, struct mfc *); 1277 1278 /* insert new entry at head of hash chain */ 1279 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1280 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1281 rt->mfc_expire = UPCALL_EXPIRE; 1282 nexpire[hash]++; 1283 for (i = 0; i < numvifs; i++) 1284 rt->mfc_ttls[i] = 0; 1285 rt->mfc_parent = -1; 1286 1287 /* link into table */ 1288 mb_rt->m_next = mfctable[hash]; 1289 mfctable[hash] = mb_rt; 1290 mb_rt->m_act = NULL; 1291 1292 rte_m = mb_rt; 1293 } else { 1294 /* determine if q has overflowed */ 1295 for (rte_m = mb_rt, npkts = 0; rte_m->m_act; rte_m = rte_m->m_act) 1296 npkts++; 1297 1298 if (npkts > MAX_UPQ) { 1299 mrtstat.mrts_upq_ovflw++; 1300 m_free(mb_ntry); 1301 m_freem(mb0); 1302 splx(s); 1303 return 0; 1304 } 1305 } 1306 1307 mb_ntry->m_act = NULL; 1308 rte = mtod(mb_ntry, struct rtdetq *); 1309 1310 rte->m = mb0; 1311 rte->ifp = ifp; 1312#ifdef UPCALL_TIMING 1313 rte->t = tp; 1314#endif 1315 1316 /* Add this entry to the end of the queue */ 1317 rte_m->m_act = mb_ntry; 1318 1319 splx(s); 1320 1321 return 0; 1322 } 1323} 1324 1325#ifndef MROUTE_LKM 1326int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 1327 struct ip_moptions *) = X_ip_mforward; 1328#endif 1329 1330/* 1331 * Clean up the cache entry if upcall is not serviced 1332 */ 1333static void 1334expire_upcalls(void *unused) 1335{ 1336 struct mbuf *mb_rt, *m, **nptr; 1337 struct rtdetq *rte; 1338 struct mfc *mfc; 1339 int i; 1340 int s; 1341 1342 s = splnet(); 1343 for (i = 0; i < MFCTBLSIZ; i++) { 1344 if (nexpire[i] == 0) 1345 continue; 1346 nptr = &mfctable[i]; 1347 for (mb_rt = *nptr; mb_rt != NULL; mb_rt = *nptr) { 1348 mfc = mtod(mb_rt, struct mfc *); 1349 1350 /* 1351 * Skip real cache entries 1352 * Make sure it wasn't marked to not expire (shouldn't happen) 1353 * If it expires now 1354 */ 1355 if (mb_rt->m_act != NULL && 1356 mfc->mfc_expire != 0 && 1357 --mfc->mfc_expire == 0) { 1358 if (mrtdebug & DEBUG_EXPIRE) 1359 log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n", 1360 (u_long)ntohl(mfc->mfc_origin.s_addr), 1361 (u_long)ntohl(mfc->mfc_mcastgrp.s_addr)); 1362 /* 1363 * drop all the packets 1364 * free the mbuf with the pkt, if, timing info 1365 */ 1366 while (mb_rt->m_act) { 1367 m = mb_rt->m_act; 1368 mb_rt->m_act = m->m_act; 1369 1370 rte = mtod(m, struct rtdetq *); 1371 m_freem(rte->m); 1372 m_free(m); 1373 } 1374 ++mrtstat.mrts_cache_cleanups; 1375 nexpire[i]--; 1376 1377 MFREE(mb_rt, *nptr); 1378 } else { 1379 nptr = &mb_rt->m_next; 1380 } 1381 } 1382 } 1383 splx(s); 1384 expire_upcalls_ch = timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 1385} 1386 1387/* 1388 * Packet forwarding routine once entry in the cache is made 1389 */ 1390static int 1391ip_mdq(m, ifp, rt, xmt_vif) 1392 register struct mbuf *m; 1393 register struct ifnet *ifp; 1394 register struct mfc *rt; 1395 register vifi_t xmt_vif; 1396{ 1397 register struct ip *ip = mtod(m, struct ip *); 1398 register vifi_t vifi; 1399 register struct vif *vifp; 1400 register int plen = ip->ip_len; 1401 1402/* 1403 * Macro to send packet on vif. Since RSVP packets don't get counted on 1404 * input, they shouldn't get counted on output, so statistics keeping is 1405 * seperate. 1406 */ 1407#define MC_SEND(ip,vifp,m) { \ 1408 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1409 encap_send((ip), (vifp), (m)); \ 1410 else \ 1411 phyint_send((ip), (vifp), (m)); \ 1412} 1413 1414 /* 1415 * If xmt_vif is not -1, send on only the requested vif. 1416 * 1417 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1418 */ 1419 if (xmt_vif < numvifs) { 1420 MC_SEND(ip, viftable + xmt_vif, m); 1421 return 1; 1422 } 1423 1424 /* 1425 * Don't forward if it didn't arrive from the parent vif for its origin. 1426 */ 1427 vifi = rt->mfc_parent; 1428 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1429 /* came in the wrong interface */ 1430 if (mrtdebug & DEBUG_FORWARD) 1431 log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n", 1432 (void *)ifp, vifi, (void *)viftable[vifi].v_ifp); 1433 ++mrtstat.mrts_wrong_if; 1434 ++rt->mfc_wrong_if; 1435 /* 1436 * If we are doing PIM assert processing, and we are forwarding 1437 * packets on this interface, and it is a broadcast medium 1438 * interface (and not a tunnel), send a message to the routing daemon. 1439 */ 1440 if (pim_assert && rt->mfc_ttls[vifi] && 1441 (ifp->if_flags & IFF_BROADCAST) && 1442 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 1443 struct sockaddr_in k_igmpsrc; 1444 struct mbuf *mm; 1445 struct igmpmsg *im; 1446 int hlen = ip->ip_hl << 2; 1447 struct timeval now; 1448 register u_long delta; 1449 1450 GET_TIME(now); 1451 1452 TV_DELTA(rt->mfc_last_assert, now, delta); 1453 1454 if (delta > ASSERT_MSG_TIME) { 1455 mm = m_copy(m, 0, hlen); 1456 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1457 mm = m_pullup(mm, hlen); 1458 if (mm == NULL) { 1459 return ENOBUFS; 1460 } 1461 1462 rt->mfc_last_assert = now; 1463 1464 im = mtod(mm, struct igmpmsg *); 1465 im->im_msgtype = IGMPMSG_WRONGVIF; 1466 im->im_mbz = 0; 1467 im->im_vif = vifi; 1468 1469 k_igmpsrc.sin_addr = im->im_src; 1470 1471 socket_send(ip_mrouter, mm, &k_igmpsrc); 1472 } 1473 } 1474 return 0; 1475 } 1476 1477 /* If I sourced this packet, it counts as output, else it was input. */ 1478 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) { 1479 viftable[vifi].v_pkt_out++; 1480 viftable[vifi].v_bytes_out += plen; 1481 } else { 1482 viftable[vifi].v_pkt_in++; 1483 viftable[vifi].v_bytes_in += plen; 1484 } 1485 rt->mfc_pkt_cnt++; 1486 rt->mfc_byte_cnt += plen; 1487 1488 /* 1489 * For each vif, decide if a copy of the packet should be forwarded. 1490 * Forward if: 1491 * - the ttl exceeds the vif's threshold 1492 * - there are group members downstream on interface 1493 */ 1494 for (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++) 1495 if ((rt->mfc_ttls[vifi] > 0) && 1496 (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1497 vifp->v_pkt_out++; 1498 vifp->v_bytes_out += plen; 1499 MC_SEND(ip, vifp, m); 1500 } 1501 1502 return 0; 1503} 1504 1505/* 1506 * check if a vif number is legal/ok. This is used by ip_output, to export 1507 * numvifs there, 1508 */ 1509static int 1510X_legal_vif_num(vif) 1511 int vif; 1512{ 1513 if (vif >= 0 && vif < numvifs) 1514 return(1); 1515 else 1516 return(0); 1517} 1518 1519#ifndef MROUTE_LKM 1520int (*legal_vif_num)(int) = X_legal_vif_num; 1521#endif 1522 1523/* 1524 * Return the local address used by this vif 1525 */ 1526static u_long 1527X_ip_mcast_src(vifi) 1528 int vifi; 1529{ 1530 if (vifi >= 0 && vifi < numvifs) 1531 return viftable[vifi].v_lcl_addr.s_addr; 1532 else 1533 return INADDR_ANY; 1534} 1535 1536#ifndef MROUTE_LKM 1537u_long (*ip_mcast_src)(int) = X_ip_mcast_src; 1538#endif 1539 1540static void 1541phyint_send(ip, vifp, m) 1542 struct ip *ip; 1543 struct vif *vifp; 1544 struct mbuf *m; 1545{ 1546 register struct mbuf *mb_copy; 1547 register int hlen = ip->ip_hl << 2; 1548 1549 /* 1550 * Make a new reference to the packet; make sure that 1551 * the IP header is actually copied, not just referenced, 1552 * so that ip_output() only scribbles on the copy. 1553 */ 1554 mb_copy = m_copy(m, 0, M_COPYALL); 1555 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1556 mb_copy = m_pullup(mb_copy, hlen); 1557 if (mb_copy == NULL) 1558 return; 1559 1560 if (vifp->v_rate_limit <= 0) 1561 tbf_send_packet(vifp, mb_copy); 1562 else 1563 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len); 1564} 1565 1566static void 1567encap_send(ip, vifp, m) 1568 register struct ip *ip; 1569 register struct vif *vifp; 1570 register struct mbuf *m; 1571{ 1572 register struct mbuf *mb_copy; 1573 register struct ip *ip_copy; 1574 register int i, len = ip->ip_len; 1575 1576 /* 1577 * copy the old packet & pullup its IP header into the 1578 * new mbuf so we can modify it. Try to fill the new 1579 * mbuf since if we don't the ethernet driver will. 1580 */ 1581 MGETHDR(mb_copy, M_DONTWAIT, MT_HEADER); 1582 if (mb_copy == NULL) 1583 return; 1584 mb_copy->m_data += max_linkhdr; 1585 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1586 1587 if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1588 m_freem(mb_copy); 1589 return; 1590 } 1591 i = MHLEN - M_LEADINGSPACE(mb_copy); 1592 if (i > len) 1593 i = len; 1594 mb_copy = m_pullup(mb_copy, i); 1595 if (mb_copy == NULL) 1596 return; 1597 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr); 1598 1599 /* 1600 * fill in the encapsulating IP header. 1601 */ 1602 ip_copy = mtod(mb_copy, struct ip *); 1603 *ip_copy = multicast_encap_iphdr; 1604 ip_copy->ip_id = htons(ip_id++); 1605 ip_copy->ip_len += len; 1606 ip_copy->ip_src = vifp->v_lcl_addr; 1607 ip_copy->ip_dst = vifp->v_rmt_addr; 1608 1609 /* 1610 * turn the encapsulated IP header back into a valid one. 1611 */ 1612 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1613 --ip->ip_ttl; 1614 HTONS(ip->ip_len); 1615 HTONS(ip->ip_off); 1616 ip->ip_sum = 0; 1617 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1618 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1619 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1620 1621 if (vifp->v_rate_limit <= 0) 1622 tbf_send_packet(vifp, mb_copy); 1623 else 1624 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len); 1625} 1626 1627/* 1628 * De-encapsulate a packet and feed it back through ip input (this 1629 * routine is called whenever IP gets a packet with proto type 1630 * ENCAP_PROTO and a local destination address). 1631 */ 1632void 1633#ifdef MROUTE_LKM 1634X_ipip_input(m, iphlen) 1635#else 1636ipip_input(m, iphlen) 1637#endif 1638 register struct mbuf *m; 1639 int iphlen; 1640{ 1641 struct ifnet *ifp = m->m_pkthdr.rcvif; 1642 register struct ip *ip = mtod(m, struct ip *); 1643 register int hlen = ip->ip_hl << 2; 1644 register int s; 1645 register struct ifqueue *ifq; 1646 register struct vif *vifp; 1647 1648 if (!have_encap_tunnel) { 1649 rip_input(m, iphlen); 1650 return; 1651 } 1652 /* 1653 * dump the packet if it's not to a multicast destination or if 1654 * we don't have an encapsulating tunnel with the source. 1655 * Note: This code assumes that the remote site IP address 1656 * uniquely identifies the tunnel (i.e., that this site has 1657 * at most one tunnel with the remote site). 1658 */ 1659 if (! IN_MULTICAST(ntohl(((struct ip *)((char *)ip + hlen))->ip_dst.s_addr))) { 1660 ++mrtstat.mrts_bad_tunnel; 1661 m_freem(m); 1662 return; 1663 } 1664 if (ip->ip_src.s_addr != last_encap_src) { 1665 register struct vif *vife; 1666 1667 vifp = viftable; 1668 vife = vifp + numvifs; 1669 last_encap_src = ip->ip_src.s_addr; 1670 last_encap_vif = 0; 1671 for ( ; vifp < vife; ++vifp) 1672 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) { 1673 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) 1674 == VIFF_TUNNEL) 1675 last_encap_vif = vifp; 1676 break; 1677 } 1678 } 1679 if ((vifp = last_encap_vif) == 0) { 1680 last_encap_src = 0; 1681 mrtstat.mrts_cant_tunnel++; /*XXX*/ 1682 m_freem(m); 1683 if (mrtdebug) 1684 log(LOG_DEBUG, "ip_mforward: no tunnel with %lx\n", 1685 (u_long)ntohl(ip->ip_src.s_addr)); 1686 return; 1687 } 1688 ifp = vifp->v_ifp; 1689 1690 if (hlen > IP_HDR_LEN) 1691 ip_stripoptions(m, (struct mbuf *) 0); 1692 m->m_data += IP_HDR_LEN; 1693 m->m_len -= IP_HDR_LEN; 1694 m->m_pkthdr.len -= IP_HDR_LEN; 1695 m->m_pkthdr.rcvif = ifp; 1696 1697 ifq = &ipintrq; 1698 s = splimp(); 1699 if (IF_QFULL(ifq)) { 1700 IF_DROP(ifq); 1701 m_freem(m); 1702 } else { 1703 IF_ENQUEUE(ifq, m); 1704 /* 1705 * normally we would need a "schednetisr(NETISR_IP)" 1706 * here but we were called by ip_input and it is going 1707 * to loop back & try to dequeue the packet we just 1708 * queued as soon as we return so we avoid the 1709 * unnecessary software interrrupt. 1710 */ 1711 } 1712 splx(s); 1713} 1714 1715/* 1716 * Token bucket filter module 1717 */ 1718 1719static void 1720tbf_control(vifp, m, ip, p_len) 1721 register struct vif *vifp; 1722 register struct mbuf *m; 1723 register struct ip *ip; 1724 register u_long p_len; 1725{ 1726 register struct tbf *t = vifp->v_tbf; 1727 1728 if (p_len > MAX_BKT_SIZE) { 1729 /* drop if packet is too large */ 1730 mrtstat.mrts_pkt2large++; 1731 m_freem(m); 1732 return; 1733 } 1734 1735 tbf_update_tokens(vifp); 1736 1737 /* if there are enough tokens, 1738 * and the queue is empty, 1739 * send this packet out 1740 */ 1741 1742 if (t->tbf_q_len == 0) { 1743 /* queue empty, send packet if enough tokens */ 1744 if (p_len <= t->tbf_n_tok) { 1745 t->tbf_n_tok -= p_len; 1746 tbf_send_packet(vifp, m); 1747 } else { 1748 /* queue packet and timeout till later */ 1749 tbf_queue(vifp, m); 1750 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1751 } 1752 } else if (t->tbf_q_len < t->tbf_max_q_len) { 1753 /* finite queue length, so queue pkts and process queue */ 1754 tbf_queue(vifp, m); 1755 tbf_process_q(vifp); 1756 } else { 1757 /* queue length too much, try to dq and queue and process */ 1758 if (!tbf_dq_sel(vifp, ip)) { 1759 mrtstat.mrts_q_overflow++; 1760 m_freem(m); 1761 return; 1762 } else { 1763 tbf_queue(vifp, m); 1764 tbf_process_q(vifp); 1765 } 1766 } 1767 return; 1768} 1769 1770/* 1771 * adds a packet to the queue at the interface 1772 */ 1773static void 1774tbf_queue(vifp, m) 1775 register struct vif *vifp; 1776 register struct mbuf *m; 1777{ 1778 register int s = splnet(); 1779 register struct tbf *t = vifp->v_tbf; 1780 1781 if (t->tbf_t == NULL) { 1782 /* Queue was empty */ 1783 t->tbf_q = m; 1784 } else { 1785 /* Insert at tail */ 1786 t->tbf_t->m_act = m; 1787 } 1788 1789 /* Set new tail pointer */ 1790 t->tbf_t = m; 1791 1792#ifdef DIAGNOSTIC 1793 /* Make sure we didn't get fed a bogus mbuf */ 1794 if (m->m_act) 1795 panic("tbf_queue: m_act"); 1796#endif 1797 m->m_act = NULL; 1798 1799 t->tbf_q_len++; 1800 1801 splx(s); 1802} 1803 1804 1805/* 1806 * processes the queue at the interface 1807 */ 1808static void 1809tbf_process_q(vifp) 1810 register struct vif *vifp; 1811{ 1812 register struct mbuf *m; 1813 register int len; 1814 register int s = splnet(); 1815 register struct tbf *t = vifp->v_tbf; 1816 1817 /* loop through the queue at the interface and send as many packets 1818 * as possible 1819 */ 1820 while (t->tbf_q_len > 0) { 1821 m = t->tbf_q; 1822 1823 len = mtod(m, struct ip *)->ip_len; 1824 1825 /* determine if the packet can be sent */ 1826 if (len <= t->tbf_n_tok) { 1827 /* if so, 1828 * reduce no of tokens, dequeue the packet, 1829 * send the packet. 1830 */ 1831 t->tbf_n_tok -= len; 1832 1833 t->tbf_q = m->m_act; 1834 if (--t->tbf_q_len == 0) 1835 t->tbf_t = NULL; 1836 1837 m->m_act = NULL; 1838 tbf_send_packet(vifp, m); 1839 1840 } else break; 1841 } 1842 splx(s); 1843} 1844 1845static void 1846tbf_reprocess_q(xvifp) 1847 void *xvifp; 1848{ 1849 register struct vif *vifp = xvifp; 1850 if (ip_mrouter == NULL) 1851 return; 1852 1853 tbf_update_tokens(vifp); 1854 1855 tbf_process_q(vifp); 1856 1857 if (vifp->v_tbf->tbf_q_len) 1858 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1859} 1860 1861/* function that will selectively discard a member of the queue 1862 * based on the precedence value and the priority 1863 */ 1864static int 1865tbf_dq_sel(vifp, ip) 1866 register struct vif *vifp; 1867 register struct ip *ip; 1868{ 1869 register int s = splnet(); 1870 register u_int p; 1871 register struct mbuf *m, *last; 1872 register struct mbuf **np; 1873 register struct tbf *t = vifp->v_tbf; 1874 1875 p = priority(vifp, ip); 1876 1877 np = &t->tbf_q; 1878 last = NULL; 1879 while ((m = *np) != NULL) { 1880 if (p > priority(vifp, mtod(m, struct ip *))) { 1881 *np = m->m_act; 1882 /* If we're removing the last packet, fix the tail pointer */ 1883 if (m == t->tbf_t) 1884 t->tbf_t = last; 1885 m_freem(m); 1886 /* it's impossible for the queue to be empty, but 1887 * we check anyway. */ 1888 if (--t->tbf_q_len == 0) 1889 t->tbf_t = NULL; 1890 splx(s); 1891 mrtstat.mrts_drop_sel++; 1892 return(1); 1893 } 1894 np = &m->m_act; 1895 last = m; 1896 } 1897 splx(s); 1898 return(0); 1899} 1900 1901static void 1902tbf_send_packet(vifp, m) 1903 register struct vif *vifp; 1904 register struct mbuf *m; 1905{ 1906 struct ip_moptions imo; 1907 int error; 1908 static struct route ro; 1909 int s = splnet(); 1910 1911 if (vifp->v_flags & VIFF_TUNNEL) { 1912 /* If tunnel options */ 1913 ip_output(m, (struct mbuf *)0, &vifp->v_route, 1914 IP_FORWARDING, (struct ip_moptions *)0); 1915 } else { 1916 imo.imo_multicast_ifp = vifp->v_ifp; 1917 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 1918 imo.imo_multicast_loop = 1; 1919 imo.imo_multicast_vif = -1; 1920 1921 /* 1922 * Re-entrancy should not be a problem here, because 1923 * the packets that we send out and are looped back at us 1924 * should get rejected because they appear to come from 1925 * the loopback interface, thus preventing looping. 1926 */ 1927 error = ip_output(m, (struct mbuf *)0, &ro, 1928 IP_FORWARDING, &imo); 1929 1930 if (mrtdebug & DEBUG_XMIT) 1931 log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 1932 vifp - viftable, error); 1933 } 1934 splx(s); 1935} 1936 1937/* determine the current time and then 1938 * the elapsed time (between the last time and time now) 1939 * in milliseconds & update the no. of tokens in the bucket 1940 */ 1941static void 1942tbf_update_tokens(vifp) 1943 register struct vif *vifp; 1944{ 1945 struct timeval tp; 1946 register u_long tm; 1947 register int s = splnet(); 1948 register struct tbf *t = vifp->v_tbf; 1949 1950 GET_TIME(tp); 1951 1952 TV_DELTA(tp, t->tbf_last_pkt_t, tm); 1953 1954 /* 1955 * This formula is actually 1956 * "time in seconds" * "bytes/second". 1957 * 1958 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 1959 * 1960 * The (1000/1024) was introduced in add_vif to optimize 1961 * this divide into a shift. 1962 */ 1963 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8; 1964 t->tbf_last_pkt_t = tp; 1965 1966 if (t->tbf_n_tok > MAX_BKT_SIZE) 1967 t->tbf_n_tok = MAX_BKT_SIZE; 1968 1969 splx(s); 1970} 1971 1972static int 1973priority(vifp, ip) 1974 register struct vif *vifp; 1975 register struct ip *ip; 1976{ 1977 register int prio; 1978 1979 /* temporary hack; may add general packet classifier some day */ 1980 1981 /* 1982 * The UDP port space is divided up into four priority ranges: 1983 * [0, 16384) : unclassified - lowest priority 1984 * [16384, 32768) : audio - highest priority 1985 * [32768, 49152) : whiteboard - medium priority 1986 * [49152, 65536) : video - low priority 1987 */ 1988 if (ip->ip_p == IPPROTO_UDP) { 1989 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 1990 switch (ntohs(udp->uh_dport) & 0xc000) { 1991 case 0x4000: 1992 prio = 70; 1993 break; 1994 case 0x8000: 1995 prio = 60; 1996 break; 1997 case 0xc000: 1998 prio = 55; 1999 break; 2000 default: 2001 prio = 50; 2002 break; 2003 } 2004 if (tbfdebug > 1) 2005 log(LOG_DEBUG, "port %x prio%d\n", ntohs(udp->uh_dport), prio); 2006 } else { 2007 prio = 50; 2008 } 2009 return prio; 2010} 2011 2012/* 2013 * End of token bucket filter modifications 2014 */ 2015 2016int 2017ip_rsvp_vif_init(so, sopt) 2018 struct socket *so; 2019 struct sockopt *sopt; 2020{ 2021 int error, i, s; 2022 2023 if (rsvpdebug) 2024 printf("ip_rsvp_vif_init: so_type = %d, pr_protocol = %d\n", 2025 so->so_type, so->so_proto->pr_protocol); 2026 2027 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2028 return EOPNOTSUPP; 2029 2030 /* Check mbuf. */ 2031 error = sooptcopyin(sopt, &i, sizeof i, sizeof i); 2032 if (error) 2033 return (error); 2034 2035 if (rsvpdebug) 2036 printf("ip_rsvp_vif_init: vif = %d rsvp_on = %d\n", i, rsvp_on); 2037 2038 s = splnet(); 2039 2040 /* Check vif. */ 2041 if (!legal_vif_num(i)) { 2042 splx(s); 2043 return EADDRNOTAVAIL; 2044 } 2045 2046 /* Check if socket is available. */ 2047 if (viftable[i].v_rsvpd != NULL) { 2048 splx(s); 2049 return EADDRINUSE; 2050 } 2051 2052 viftable[i].v_rsvpd = so; 2053 /* This may seem silly, but we need to be sure we don't over-increment 2054 * the RSVP counter, in case something slips up. 2055 */ 2056 if (!viftable[i].v_rsvp_on) { 2057 viftable[i].v_rsvp_on = 1; 2058 rsvp_on++; 2059 } 2060 2061 splx(s); 2062 return 0; 2063} 2064 2065int 2066ip_rsvp_vif_done(so, sopt) 2067 struct socket *so; 2068 struct sockopt *sopt; 2069{ 2070 int error, i, s; 2071 2072 if (rsvpdebug) 2073 printf("ip_rsvp_vif_done: so_type = %d, pr_protocol = %d\n", 2074 so->so_type, so->so_proto->pr_protocol); 2075 2076 if (so->so_type != SOCK_RAW || 2077 so->so_proto->pr_protocol != IPPROTO_RSVP) 2078 return EOPNOTSUPP; 2079 2080 error = sooptcopyin(sopt, &i, sizeof i, sizeof i); 2081 if (error) 2082 return (error); 2083 2084 s = splnet(); 2085 2086 /* Check vif. */ 2087 if (!legal_vif_num(i)) { 2088 splx(s); 2089 return EADDRNOTAVAIL; 2090 } 2091 2092 if (rsvpdebug) 2093 printf("ip_rsvp_vif_done: v_rsvpd = %p so = %p\n", 2094 viftable[i].v_rsvpd, so); 2095 2096 viftable[i].v_rsvpd = NULL; 2097 /* 2098 * This may seem silly, but we need to be sure we don't over-decrement 2099 * the RSVP counter, in case something slips up. 2100 */ 2101 if (viftable[i].v_rsvp_on) { 2102 viftable[i].v_rsvp_on = 0; 2103 rsvp_on--; 2104 } 2105 2106 splx(s); 2107 return 0; 2108} 2109 2110void 2111ip_rsvp_force_done(so) 2112 struct socket *so; 2113{ 2114 int vifi; 2115 register int s; 2116 2117 /* Don't bother if it is not the right type of socket. */ 2118 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2119 return; 2120 2121 s = splnet(); 2122 2123 /* The socket may be attached to more than one vif...this 2124 * is perfectly legal. 2125 */ 2126 for (vifi = 0; vifi < numvifs; vifi++) { 2127 if (viftable[vifi].v_rsvpd == so) { 2128 viftable[vifi].v_rsvpd = NULL; 2129 /* This may seem silly, but we need to be sure we don't 2130 * over-decrement the RSVP counter, in case something slips up. 2131 */ 2132 if (viftable[vifi].v_rsvp_on) { 2133 viftable[vifi].v_rsvp_on = 0; 2134 rsvp_on--; 2135 } 2136 } 2137 } 2138 2139 splx(s); 2140 return; 2141} 2142 2143void 2144rsvp_input(m, iphlen) 2145 struct mbuf *m; 2146 int iphlen; 2147{ 2148 int vifi; 2149 register struct ip *ip = mtod(m, struct ip *); 2150 static struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET }; 2151 register int s; 2152 struct ifnet *ifp; 2153 2154 if (rsvpdebug) 2155 printf("rsvp_input: rsvp_on %d\n",rsvp_on); 2156 2157 /* Can still get packets with rsvp_on = 0 if there is a local member 2158 * of the group to which the RSVP packet is addressed. But in this 2159 * case we want to throw the packet away. 2160 */ 2161 if (!rsvp_on) { 2162 m_freem(m); 2163 return; 2164 } 2165 2166 /* If the old-style non-vif-associated socket is set, then use 2167 * it and ignore the new ones. 2168 */ 2169 if (ip_rsvpd != NULL) { 2170 if (rsvpdebug) 2171 printf("rsvp_input: Sending packet up old-style socket\n"); 2172 rip_input(m, iphlen); 2173 return; 2174 } 2175 2176 s = splnet(); 2177 2178 if (rsvpdebug) 2179 printf("rsvp_input: check vifs\n"); 2180 2181#ifdef DIAGNOSTIC 2182 if (!(m->m_flags & M_PKTHDR)) 2183 panic("rsvp_input no hdr"); 2184#endif 2185 2186 ifp = m->m_pkthdr.rcvif; 2187 /* Find which vif the packet arrived on. */ 2188 for (vifi = 0; vifi < numvifs; vifi++) { 2189 if (viftable[vifi].v_ifp == ifp) 2190 break; 2191 } 2192 2193 if (vifi == numvifs) { 2194 /* Can't find vif packet arrived on. Drop packet. */ 2195 if (rsvpdebug) 2196 printf("rsvp_input: Can't find vif for packet...dropping it.\n"); 2197 m_freem(m); 2198 splx(s); 2199 return; 2200 } 2201 2202 if (rsvpdebug) 2203 printf("rsvp_input: check socket\n"); 2204 2205 if (viftable[vifi].v_rsvpd == NULL) { 2206 /* drop packet, since there is no specific socket for this 2207 * interface */ 2208 if (rsvpdebug) 2209 printf("rsvp_input: No socket defined for vif %d\n",vifi); 2210 m_freem(m); 2211 splx(s); 2212 return; 2213 } 2214 rsvp_src.sin_addr = ip->ip_src; 2215 2216 if (rsvpdebug && m) 2217 printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n", 2218 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv))); 2219 2220 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) 2221 if (rsvpdebug) 2222 printf("rsvp_input: Failed to append to socket\n"); 2223 else 2224 if (rsvpdebug) 2225 printf("rsvp_input: send packet up\n"); 2226 2227 splx(s); 2228} 2229 2230#ifdef MROUTE_LKM 2231#include <sys/conf.h> 2232#include <sys/exec.h> 2233#include <sys/sysent.h> 2234#include <sys/lkm.h> 2235 2236MOD_MISC("ip_mroute_mod") 2237 2238static int 2239ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd) 2240{ 2241 int i; 2242 struct lkm_misc *args = lkmtp->private.lkm_misc; 2243 int err = 0; 2244 2245 switch(cmd) { 2246 static int (*old_ip_mrouter_cmd)(); 2247 static int (*old_ip_mrouter_done)(); 2248 static int (*old_ip_mforward)(); 2249 static int (*old_mrt_ioctl)(); 2250 static void (*old_proto4_input)(); 2251 static int (*old_legal_vif_num)(); 2252 extern struct protosw inetsw[]; 2253 2254 case LKM_E_LOAD: 2255 if(lkmexists(lkmtp) || ip_mrtproto) 2256 return(EEXIST); 2257 old_ip_mrouter_cmd = ip_mrouter_cmd; 2258 ip_mrouter_cmd = X_ip_mrouter_cmd; 2259 old_ip_mrouter_done = ip_mrouter_done; 2260 ip_mrouter_done = X_ip_mrouter_done; 2261 old_ip_mforward = ip_mforward; 2262 ip_mforward = X_ip_mforward; 2263 old_mrt_ioctl = mrt_ioctl; 2264 mrt_ioctl = X_mrt_ioctl; 2265 old_proto4_input = inetsw[ip_protox[ENCAP_PROTO]].pr_input; 2266 inetsw[ip_protox[ENCAP_PROTO]].pr_input = X_ipip_input; 2267 old_legal_vif_num = legal_vif_num; 2268 legal_vif_num = X_legal_vif_num; 2269 ip_mrtproto = IGMP_DVMRP; 2270 2271 printf("\nIP multicast routing loaded\n"); 2272 break; 2273 2274 case LKM_E_UNLOAD: 2275 if (ip_mrouter) 2276 return EINVAL; 2277 2278 ip_mrouter_cmd = old_ip_mrouter_cmd; 2279 ip_mrouter_done = old_ip_mrouter_done; 2280 ip_mforward = old_ip_mforward; 2281 mrt_ioctl = old_mrt_ioctl; 2282 inetsw[ip_protox[ENCAP_PROTO]].pr_input = old_proto4_input; 2283 legal_vif_num = old_legal_vif_num; 2284 ip_mrtproto = 0; 2285 break; 2286 2287 default: 2288 err = EINVAL; 2289 break; 2290 } 2291 2292 return(err); 2293} 2294 2295int 2296ip_mroute_mod(struct lkm_table *lkmtp, int cmd, int ver) { 2297 DISPATCH(lkmtp, cmd, ver, ip_mroute_mod_handle, ip_mroute_mod_handle, 2298 nosys); 2299} 2300 2301#endif /* MROUTE_LKM */ 2302#endif /* MROUTING */ 2303