ip_mroute.c revision 14328
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 1.27 1995/12/14 09:53:43 phk 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/errno.h> 24#include <sys/time.h> 25#include <sys/kernel.h> 26#include <sys/ioctl.h> 27#include <sys/syslog.h> 28#include <sys/queue.h> 29#include <net/if.h> 30#include <net/route.h> 31#include <netinet/in.h> 32#include <netinet/in_systm.h> 33#include <netinet/ip.h> 34#include <netinet/ip_var.h> 35#include <netinet/in_pcb.h> 36#include <netinet/in_var.h> 37#include <netinet/igmp.h> 38#include <netinet/igmp_var.h> 39#include <netinet/ip_mroute.h> 40#include <netinet/udp.h> 41 42extern void rsvp_input __P((struct mbuf *m, int iphlen)); 43 44#ifndef NTOHL 45#if BYTE_ORDER != BIG_ENDIAN 46#define NTOHL(d) ((d) = ntohl((d))) 47#define NTOHS(d) ((d) = ntohs((u_short)(d))) 48#define HTONL(d) ((d) = htonl((d))) 49#define HTONS(d) ((d) = htons((u_short)(d))) 50#else 51#define NTOHL(d) 52#define NTOHS(d) 53#define HTONL(d) 54#define HTONS(d) 55#endif 56#endif 57 58#ifndef MROUTING 59extern void ipip_input __P((struct mbuf *m)); 60extern u_long _ip_mcast_src __P((int vifi)); 61extern int _ip_mforward __P((struct ip *ip, struct ifnet *ifp, 62 struct mbuf *m, struct ip_moptions *imo)); 63extern int _ip_mrouter_done __P((void)); 64extern int _ip_mrouter_get __P((int cmd, struct socket *so, 65 struct mbuf **m)); 66extern int _ip_mrouter_set __P((int cmd, struct socket *so, 67 struct mbuf *m)); 68extern int _mrt_ioctl __P((int req, caddr_t data, struct proc *p)); 69 70/* 71 * Dummy routines and globals used when multicast routing is not compiled in. 72 */ 73 74struct socket *ip_mrouter = NULL; 75static u_int ip_mrtproto = 0; 76static struct mrtstat mrtstat; 77u_int rsvpdebug = 0; 78 79int 80_ip_mrouter_set(cmd, so, m) 81 int cmd; 82 struct socket *so; 83 struct mbuf *m; 84{ 85 return(EOPNOTSUPP); 86} 87 88int (*ip_mrouter_set)(int, struct socket *, struct mbuf *) = _ip_mrouter_set; 89 90 91int 92_ip_mrouter_get(cmd, so, m) 93 int cmd; 94 struct socket *so; 95 struct mbuf **m; 96{ 97 return(EOPNOTSUPP); 98} 99 100int (*ip_mrouter_get)(int, struct socket *, struct mbuf **) = _ip_mrouter_get; 101 102int 103_ip_mrouter_done() 104{ 105 return(0); 106} 107 108int (*ip_mrouter_done)(void) = _ip_mrouter_done; 109 110int 111_ip_mforward(ip, ifp, m, imo) 112 struct ip *ip; 113 struct ifnet *ifp; 114 struct mbuf *m; 115 struct ip_moptions *imo; 116{ 117 return(0); 118} 119 120int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 121 struct ip_moptions *) = _ip_mforward; 122 123int 124_mrt_ioctl(int req, caddr_t data, struct proc *p) 125{ 126 return EOPNOTSUPP; 127} 128 129int (*mrt_ioctl)(int, caddr_t, struct proc *) = _mrt_ioctl; 130 131void 132rsvp_input(m, iphlen) /* XXX must fixup manually */ 133 struct mbuf *m; 134 int iphlen; 135{ 136 /* Can still get packets with rsvp_on = 0 if there is a local member 137 * of the group to which the RSVP packet is addressed. But in this 138 * case we want to throw the packet away. 139 */ 140 if (!rsvp_on) { 141 m_freem(m); 142 return; 143 } 144 145 if (ip_rsvpd != NULL) { 146 if (rsvpdebug) 147 printf("rsvp_input: Sending packet up old-style socket\n"); 148 rip_input(m); 149 return; 150 } 151 /* Drop the packet */ 152 m_freem(m); 153} 154 155void ipip_input(struct mbuf *m) { /* XXX must fixup manually */ 156 rip_input(m); 157} 158 159int (*legal_vif_num)(int) = 0; 160 161/* 162 * This should never be called, since IP_MULTICAST_VIF should fail, but 163 * just in case it does get called, the code a little lower in ip_output 164 * will assign the packet a local address. 165 */ 166u_long 167_ip_mcast_src(int vifi) { return INADDR_ANY; } 168u_long (*ip_mcast_src)(int) = _ip_mcast_src; 169 170int 171ip_rsvp_vif_init(so, m) 172 struct socket *so; 173 struct mbuf *m; 174{ 175 return(EINVAL); 176} 177 178int 179ip_rsvp_vif_done(so, m) 180 struct socket *so; 181 struct mbuf *m; 182{ 183 return(EINVAL); 184} 185 186void 187ip_rsvp_force_done(so) 188 struct socket *so; 189{ 190 return; 191} 192 193#else /* MROUTING */ 194 195#define M_HASCL(m) ((m)->m_flags & M_EXT) 196 197#define INSIZ sizeof(struct in_addr) 198#define same(a1, a2) \ 199 (bcmp((caddr_t)(a1), (caddr_t)(a2), INSIZ) == 0) 200 201#define MT_MRTABLE MT_RTABLE /* since nothing else uses it */ 202 203/* 204 * Globals. All but ip_mrouter and ip_mrtproto could be static, 205 * except for netstat or debugging purposes. 206 */ 207#ifndef MROUTE_LKM 208extern void ipip_input __P((struct mbuf *m, int iphlen)); 209struct socket *ip_mrouter = NULL; 210struct mrtstat mrtstat; 211 212int ip_mrtproto = IGMP_DVMRP; /* for netstat only */ 213#else /* MROUTE_LKM */ 214#error /* the function definition will have a syntax error */ 215extern void X_ipip_input __P((struct mbuf *m)); 216extern struct mrtstat mrtstat; 217static int ip_mrtproto; 218#endif 219 220#define NO_RTE_FOUND 0x1 221#define RTE_FOUND 0x2 222 223static struct mbuf *mfctable[MFCTBLSIZ]; 224static u_char nexpire[MFCTBLSIZ]; 225static struct vif viftable[MAXVIFS]; 226static u_int mrtdebug = 0; /* debug level */ 227#define DEBUG_MFC 0x02 228#define DEBUG_FORWARD 0x04 229#define DEBUG_EXPIRE 0x08 230#define DEBUG_XMIT 0x10 231static u_int tbfdebug = 0; /* tbf debug level */ 232static u_int rsvpdebug = 0; /* rsvp debug level */ 233 234#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 235#define UPCALL_EXPIRE 6 /* number of timeouts */ 236 237/* 238 * Define the token bucket filter structures 239 * tbftable -> each vif has one of these for storing info 240 */ 241 242static struct tbf tbftable[MAXVIFS]; 243#define TBF_REPROCESS (hz / 100) /* 100x / second */ 244 245/* 246 * 'Interfaces' associated with decapsulator (so we can tell 247 * packets that went through it from ones that get reflected 248 * by a broken gateway). These interfaces are never linked into 249 * the system ifnet list & no routes point to them. I.e., packets 250 * can't be sent this way. They only exist as a placeholder for 251 * multicast source verification. 252 */ 253static struct ifnet multicast_decap_if[MAXVIFS]; 254 255#define ENCAP_TTL 64 256#define ENCAP_PROTO IPPROTO_IPIP /* 4 */ 257 258/* prototype IP hdr for encapsulated packets */ 259static struct ip multicast_encap_iphdr = { 260#if BYTE_ORDER == LITTLE_ENDIAN 261 sizeof(struct ip) >> 2, IPVERSION, 262#else 263 IPVERSION, sizeof(struct ip) >> 2, 264#endif 265 0, /* tos */ 266 sizeof(struct ip), /* total length */ 267 0, /* id */ 268 0, /* frag offset */ 269 ENCAP_TTL, ENCAP_PROTO, 270 0, /* checksum */ 271}; 272 273/* 274 * Private variables. 275 */ 276static vifi_t numvifs = 0; 277static int have_encap_tunnel = 0; 278 279/* 280 * one-back cache used by ipip_input to locate a tunnel's vif 281 * given a datagram's src ip address. 282 */ 283static u_long last_encap_src; 284static struct vif *last_encap_vif; 285 286static u_long X_ip_mcast_src __P((int vifi)); 287static int X_ip_mforward __P((struct ip *ip, struct ifnet *ifp, struct mbuf *m, struct ip_moptions *imo)); 288static int X_ip_mrouter_done __P((void)); 289static int X_ip_mrouter_get __P((int cmd, struct socket *so, struct mbuf **m)); 290static int X_ip_mrouter_set __P((int cmd, struct socket *so, struct mbuf *m)); 291static int X_legal_vif_num __P((int vif)); 292static int X_mrt_ioctl __P((int cmd, caddr_t data)); 293 294static int get_sg_cnt(struct sioc_sg_req *); 295static int get_vif_cnt(struct sioc_vif_req *); 296static int ip_mrouter_init(struct socket *, struct mbuf *); 297static int add_vif(struct vifctl *); 298static int del_vif(vifi_t *); 299static int add_mfc(struct mfcctl *); 300static int del_mfc(struct mfcctl *); 301static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *); 302static int get_version(struct mbuf *); 303static int get_assert(struct mbuf *); 304static int set_assert(int *); 305static void expire_upcalls(void *); 306static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, 307 vifi_t); 308static void phyint_send(struct ip *, struct vif *, struct mbuf *); 309static void encap_send(struct ip *, struct vif *, struct mbuf *); 310static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long); 311static void tbf_queue(struct vif *, struct mbuf *); 312static void tbf_process_q(struct vif *); 313static void tbf_reprocess_q(void *); 314static int tbf_dq_sel(struct vif *, struct ip *); 315static void tbf_send_packet(struct vif *, struct mbuf *); 316static void tbf_update_tokens(struct vif *); 317static int priority(struct vif *, struct ip *); 318void multiencap_decap(struct mbuf *); 319 320/* 321 * whether or not special PIM assert processing is enabled. 322 */ 323static int pim_assert; 324/* 325 * Rate limit for assert notification messages, in usec 326 */ 327#define ASSERT_MSG_TIME 3000000 328 329/* 330 * Hash function for a source, group entry 331 */ 332#define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \ 333 ((g) >> 20) ^ ((g) >> 10) ^ (g)) 334 335/* 336 * Find a route for a given origin IP address and Multicast group address 337 * Type of service parameter to be added in the future!!! 338 */ 339 340#define MFCFIND(o, g, rt) { \ 341 register struct mbuf *_mb_rt = mfctable[MFCHASH(o,g)]; \ 342 register struct mfc *_rt = NULL; \ 343 rt = NULL; \ 344 ++mrtstat.mrts_mfc_lookups; \ 345 while (_mb_rt) { \ 346 _rt = mtod(_mb_rt, struct mfc *); \ 347 if ((_rt->mfc_origin.s_addr == o) && \ 348 (_rt->mfc_mcastgrp.s_addr == g) && \ 349 (_mb_rt->m_act == NULL)) { \ 350 rt = _rt; \ 351 break; \ 352 } \ 353 _mb_rt = _mb_rt->m_next; \ 354 } \ 355 if (rt == NULL) { \ 356 ++mrtstat.mrts_mfc_misses; \ 357 } \ 358} 359 360 361/* 362 * Macros to compute elapsed time efficiently 363 * Borrowed from Van Jacobson's scheduling code 364 */ 365#define TV_DELTA(a, b, delta) { \ 366 register int xxs; \ 367 \ 368 delta = (a).tv_usec - (b).tv_usec; \ 369 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 370 switch (xxs) { \ 371 case 2: \ 372 delta += 1000000; \ 373 /* fall through */ \ 374 case 1: \ 375 delta += 1000000; \ 376 break; \ 377 default: \ 378 delta += (1000000 * xxs); \ 379 } \ 380 } \ 381} 382 383#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 384 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 385 386#ifdef UPCALL_TIMING 387u_long upcall_data[51]; 388static void collate(struct timeval *); 389#endif /* UPCALL_TIMING */ 390 391 392/* 393 * Handle MRT setsockopt commands to modify the multicast routing tables. 394 */ 395static int 396X_ip_mrouter_set(cmd, so, m) 397 int cmd; 398 struct socket *so; 399 struct mbuf *m; 400{ 401 if (cmd != MRT_INIT && so != ip_mrouter) return EACCES; 402 403 switch (cmd) { 404 case MRT_INIT: return ip_mrouter_init(so, m); 405 case MRT_DONE: return ip_mrouter_done(); 406 case MRT_ADD_VIF: return add_vif (mtod(m, struct vifctl *)); 407 case MRT_DEL_VIF: return del_vif (mtod(m, vifi_t *)); 408 case MRT_ADD_MFC: return add_mfc (mtod(m, struct mfcctl *)); 409 case MRT_DEL_MFC: return del_mfc (mtod(m, struct mfcctl *)); 410 case MRT_ASSERT: return set_assert(mtod(m, int *)); 411 default: return EOPNOTSUPP; 412 } 413} 414 415#ifndef MROUTE_LKM 416int (*ip_mrouter_set)(int, struct socket *, struct mbuf *) = X_ip_mrouter_set; 417#endif 418 419/* 420 * Handle MRT getsockopt commands 421 */ 422static int 423X_ip_mrouter_get(cmd, so, m) 424 int cmd; 425 struct socket *so; 426 struct mbuf **m; 427{ 428 struct mbuf *mb; 429 430 if (so != ip_mrouter) return EACCES; 431 432 *m = mb = m_get(M_WAIT, MT_SOOPTS); 433 434 switch (cmd) { 435 case MRT_VERSION: return get_version(mb); 436 case MRT_ASSERT: return get_assert(mb); 437 default: return EOPNOTSUPP; 438 } 439} 440 441#ifndef MROUTE_LKM 442int (*ip_mrouter_get)(int, struct socket *, struct mbuf **) = X_ip_mrouter_get; 443#endif 444 445/* 446 * Handle ioctl commands to obtain information from the cache 447 */ 448static int 449X_mrt_ioctl(cmd, data) 450 int cmd; 451 caddr_t data; 452{ 453 int error = 0; 454 455 switch (cmd) { 456 case (SIOCGETVIFCNT): 457 return (get_vif_cnt((struct sioc_vif_req *)data)); 458 break; 459 case (SIOCGETSGCNT): 460 return (get_sg_cnt((struct sioc_sg_req *)data)); 461 break; 462 default: 463 return (EINVAL); 464 break; 465 } 466 return error; 467} 468 469#ifndef MROUTE_LKM 470int (*mrt_ioctl)(int, caddr_t) = X_mrt_ioctl; 471#endif 472 473/* 474 * returns the packet, byte, rpf-failure count for the source group provided 475 */ 476static int 477get_sg_cnt(req) 478 register struct sioc_sg_req *req; 479{ 480 register struct mfc *rt; 481 int s; 482 483 s = splnet(); 484 MFCFIND(req->src.s_addr, req->grp.s_addr, rt); 485 splx(s); 486 if (rt != NULL) { 487 req->pktcnt = rt->mfc_pkt_cnt; 488 req->bytecnt = rt->mfc_byte_cnt; 489 req->wrong_if = rt->mfc_wrong_if; 490 } else 491 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 492 493 return 0; 494} 495 496/* 497 * returns the input and output packet and byte counts on the vif provided 498 */ 499static int 500get_vif_cnt(req) 501 register struct sioc_vif_req *req; 502{ 503 register vifi_t vifi = req->vifi; 504 505 if (vifi >= numvifs) return EINVAL; 506 507 req->icount = viftable[vifi].v_pkt_in; 508 req->ocount = viftable[vifi].v_pkt_out; 509 req->ibytes = viftable[vifi].v_bytes_in; 510 req->obytes = viftable[vifi].v_bytes_out; 511 512 return 0; 513} 514 515/* 516 * Enable multicast routing 517 */ 518static int 519ip_mrouter_init(so, m) 520 struct socket *so; 521 struct mbuf *m; 522{ 523 int *v; 524 525 if (mrtdebug) 526 log(LOG_DEBUG,"ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 527 so->so_type, so->so_proto->pr_protocol); 528 529 if (so->so_type != SOCK_RAW || 530 so->so_proto->pr_protocol != IPPROTO_IGMP) return EOPNOTSUPP; 531 532 if (!m || (m->m_len != sizeof(int *))) 533 return ENOPROTOOPT; 534 535 v = mtod(m, int *); 536 if (*v != 1) 537 return ENOPROTOOPT; 538 539 if (ip_mrouter != NULL) return EADDRINUSE; 540 541 ip_mrouter = so; 542 543 bzero((caddr_t)mfctable, sizeof(mfctable)); 544 bzero((caddr_t)nexpire, sizeof(nexpire)); 545 546 pim_assert = 0; 547 548 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 549 550 if (mrtdebug) 551 log(LOG_DEBUG, "ip_mrouter_init\n"); 552 553 return 0; 554} 555 556/* 557 * Disable multicast routing 558 */ 559static int 560X_ip_mrouter_done() 561{ 562 vifi_t vifi; 563 int i; 564 struct ifnet *ifp; 565 struct ifreq ifr; 566 struct mbuf *mb_rt; 567 struct mbuf *m; 568 struct rtdetq *rte; 569 int s; 570 571 s = splnet(); 572 573 /* 574 * For each phyint in use, disable promiscuous reception of all IP 575 * multicasts. 576 */ 577 for (vifi = 0; vifi < numvifs; vifi++) { 578 if (viftable[vifi].v_lcl_addr.s_addr != 0 && 579 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 580 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 581 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr 582 = INADDR_ANY; 583 ifp = viftable[vifi].v_ifp; 584 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 585 } 586 } 587 bzero((caddr_t)tbftable, sizeof(tbftable)); 588 bzero((caddr_t)viftable, sizeof(viftable)); 589 numvifs = 0; 590 pim_assert = 0; 591 592 untimeout(expire_upcalls, (caddr_t)NULL); 593 594 /* 595 * Free all multicast forwarding cache entries. 596 */ 597 for (i = 0; i < MFCTBLSIZ; i++) { 598 mb_rt = mfctable[i]; 599 while (mb_rt) { 600 if (mb_rt->m_act != NULL) { 601 while (mb_rt->m_act) { 602 m = mb_rt->m_act; 603 mb_rt->m_act = m->m_act; 604 rte = mtod(m, struct rtdetq *); 605 m_freem(rte->m); 606 m_free(m); 607 } 608 } 609 mb_rt = m_free(mb_rt); 610 } 611 } 612 613 bzero((caddr_t)mfctable, sizeof(mfctable)); 614 615 /* 616 * Reset de-encapsulation cache 617 */ 618 last_encap_src = NULL; 619 last_encap_vif = NULL; 620 have_encap_tunnel = 0; 621 622 ip_mrouter = NULL; 623 624 splx(s); 625 626 if (mrtdebug) 627 log(LOG_DEBUG, "ip_mrouter_done\n"); 628 629 return 0; 630} 631 632#ifndef MROUTE_LKM 633int (*ip_mrouter_done)(void) = X_ip_mrouter_done; 634#endif 635 636static int 637get_version(mb) 638 struct mbuf *mb; 639{ 640 int *v; 641 642 v = mtod(mb, int *); 643 644 *v = 0x0305; /* XXX !!!! */ 645 mb->m_len = sizeof(int); 646 647 return 0; 648} 649 650/* 651 * Set PIM assert processing global 652 */ 653static int 654set_assert(i) 655 int *i; 656{ 657 if ((*i != 1) && (*i != 0)) 658 return EINVAL; 659 660 pim_assert = *i; 661 662 return 0; 663} 664 665/* 666 * Get PIM assert processing global 667 */ 668static int 669get_assert(m) 670 struct mbuf *m; 671{ 672 int *i; 673 674 i = mtod(m, int *); 675 676 *i = pim_assert; 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 struct ifreq ifr; 693 int error, s; 694 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi; 695 696 if (vifcp->vifc_vifi >= MAXVIFS) return EINVAL; 697 if (vifp->v_lcl_addr.s_addr != 0) return EADDRINUSE; 698 699 /* Find the interface with an address in AF_INET family */ 700 sin.sin_addr = vifcp->vifc_lcl_addr; 701 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 702 if (ifa == 0) return EADDRNOTAVAIL; 703 ifp = ifa->ifa_ifp; 704 705 if (vifcp->vifc_flags & VIFF_TUNNEL) { 706 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) { 707 /* 708 * An encapsulating tunnel is wanted. Tell ipip_input() to 709 * start paying attention to encapsulated packets. 710 */ 711 if (have_encap_tunnel == 0) { 712 have_encap_tunnel = 1; 713 for (s = 0; s < MAXVIFS; ++s) { 714 multicast_decap_if[s].if_name = "mdecap"; 715 multicast_decap_if[s].if_unit = s; 716 } 717 } 718 /* 719 * Set interface to fake encapsulator interface 720 */ 721 ifp = &multicast_decap_if[vifcp->vifc_vifi]; 722 /* 723 * Prepare cached route entry 724 */ 725 bzero(&vifp->v_route, sizeof(vifp->v_route)); 726 } else { 727 log(LOG_ERR, "source routed tunnels not supported\n"); 728 return EOPNOTSUPP; 729 } 730 } else { 731 /* Make sure the interface supports multicast */ 732 if ((ifp->if_flags & IFF_MULTICAST) == 0) 733 return EOPNOTSUPP; 734 735 /* Enable promiscuous reception of all IP multicasts from the if */ 736 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 737 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY; 738 s = splnet(); 739 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 740 splx(s); 741 if (error) 742 return error; 743 } 744 745 s = splnet(); 746 /* define parameters for the tbf structure */ 747 vifp->v_tbf = v_tbf; 748 GET_TIME(vifp->v_tbf->tbf_last_pkt_t); 749 vifp->v_tbf->tbf_n_tok = 0; 750 vifp->v_tbf->tbf_q_len = 0; 751 vifp->v_tbf->tbf_max_q_len = MAXQSIZE; 752 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL; 753 754 vifp->v_flags = vifcp->vifc_flags; 755 vifp->v_threshold = vifcp->vifc_threshold; 756 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 757 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 758 vifp->v_ifp = ifp; 759 /* scaling up here allows division by 1024 in critical code */ 760 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000; 761 vifp->v_rsvp_on = 0; 762 vifp->v_rsvpd = NULL; 763 /* initialize per vif pkt counters */ 764 vifp->v_pkt_in = 0; 765 vifp->v_pkt_out = 0; 766 vifp->v_bytes_in = 0; 767 vifp->v_bytes_out = 0; 768 splx(s); 769 770 /* Adjust numvifs up if the vifi is higher than numvifs */ 771 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1; 772 773 if (mrtdebug) 774 log(LOG_DEBUG, "add_vif #%d, lcladdr %x, %s %x, thresh %x, rate %d\n", 775 vifcp->vifc_vifi, 776 ntohl(vifcp->vifc_lcl_addr.s_addr), 777 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 778 ntohl(vifcp->vifc_rmt_addr.s_addr), 779 vifcp->vifc_threshold, 780 vifcp->vifc_rate_limit); 781 782 return 0; 783} 784 785/* 786 * Delete a vif from the vif table 787 */ 788static int 789del_vif(vifip) 790 vifi_t *vifip; 791{ 792 register struct vif *vifp = viftable + *vifip; 793 register vifi_t vifi; 794 register struct mbuf *m; 795 struct ifnet *ifp; 796 struct ifreq ifr; 797 int s; 798 799 if (*vifip >= numvifs) return EINVAL; 800 if (vifp->v_lcl_addr.s_addr == 0) return EADDRNOTAVAIL; 801 802 s = splnet(); 803 804 if (!(vifp->v_flags & VIFF_TUNNEL)) { 805 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 806 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY; 807 ifp = vifp->v_ifp; 808 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 809 } 810 811 if (vifp == last_encap_vif) { 812 last_encap_vif = 0; 813 last_encap_src = 0; 814 } 815 816 /* 817 * Free packets queued at the interface 818 */ 819 while (vifp->v_tbf->tbf_q) { 820 m = vifp->v_tbf->tbf_q; 821 vifp->v_tbf->tbf_q = m->m_act; 822 m_freem(m); 823 } 824 825 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf))); 826 bzero((caddr_t)vifp, sizeof (*vifp)); 827 828 /* Adjust numvifs down */ 829 for (vifi = numvifs; vifi > 0; vifi--) 830 if (viftable[vifi-1].v_lcl_addr.s_addr != 0) break; 831 numvifs = vifi; 832 833 splx(s); 834 835 if (mrtdebug) 836 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", *vifip, numvifs); 837 838 return 0; 839} 840 841/* 842 * Add an mfc entry 843 */ 844static int 845add_mfc(mfccp) 846 struct mfcctl *mfccp; 847{ 848 struct mfc *rt; 849 register struct mbuf *mb_rt; 850 u_long hash; 851 struct mbuf *mb_ntry; 852 struct rtdetq *rte; 853 register u_short nstl; 854 int s; 855 int i; 856 857 MFCFIND(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr, rt); 858 859 /* If an entry already exists, just update the fields */ 860 if (rt) { 861 if (mrtdebug & DEBUG_MFC) 862 log(LOG_DEBUG,"add_mfc update o %x g %x p %x\n", 863 ntohl(mfccp->mfcc_origin.s_addr), 864 ntohl(mfccp->mfcc_mcastgrp.s_addr), 865 mfccp->mfcc_parent); 866 867 s = splnet(); 868 rt->mfc_parent = mfccp->mfcc_parent; 869 for (i = 0; i < numvifs; i++) 870 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 871 splx(s); 872 return 0; 873 } 874 875 /* 876 * Find the entry for which the upcall was made and update 877 */ 878 s = splnet(); 879 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 880 for (mb_rt = mfctable[hash], nstl = 0; mb_rt; mb_rt = mb_rt->m_next) { 881 882 rt = mtod(mb_rt, struct mfc *); 883 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 884 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) && 885 (mb_rt->m_act != NULL)) { 886 887 if (nstl++) 888 log(LOG_ERR, "add_mfc %s o %x g %x p %x dbx %x\n", 889 "multiple kernel entries", 890 ntohl(mfccp->mfcc_origin.s_addr), 891 ntohl(mfccp->mfcc_mcastgrp.s_addr), 892 mfccp->mfcc_parent, mb_rt->m_act); 893 894 if (mrtdebug & DEBUG_MFC) 895 log(LOG_DEBUG,"add_mfc o %x g %x p %x dbg %x\n", 896 ntohl(mfccp->mfcc_origin.s_addr), 897 ntohl(mfccp->mfcc_mcastgrp.s_addr), 898 mfccp->mfcc_parent, mb_rt->m_act); 899 900 rt->mfc_origin = mfccp->mfcc_origin; 901 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 902 rt->mfc_parent = mfccp->mfcc_parent; 903 for (i = 0; i < numvifs; i++) 904 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 905 /* initialize pkt counters per src-grp */ 906 rt->mfc_pkt_cnt = 0; 907 rt->mfc_byte_cnt = 0; 908 rt->mfc_wrong_if = 0; 909 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 910 911 rt->mfc_expire = 0; /* Don't clean this guy up */ 912 nexpire[hash]--; 913 914 /* free packets Qed at the end of this entry */ 915 while (mb_rt->m_act) { 916 mb_ntry = mb_rt->m_act; 917 rte = mtod(mb_ntry, struct rtdetq *); 918/* #ifdef RSVP_ISI */ 919 ip_mdq(rte->m, rte->ifp, rt, -1); 920/* #endif */ 921 mb_rt->m_act = mb_ntry->m_act; 922 m_freem(rte->m); 923#ifdef UPCALL_TIMING 924 collate(&(rte->t)); 925#endif /* UPCALL_TIMING */ 926 m_free(mb_ntry); 927 } 928 } 929 } 930 931 /* 932 * It is possible that an entry is being inserted without an upcall 933 */ 934 if (nstl == 0) { 935 if (mrtdebug & DEBUG_MFC) 936 log(LOG_DEBUG,"add_mfc no upcall h %d o %x g %x p %x\n", 937 hash, ntohl(mfccp->mfcc_origin.s_addr), 938 ntohl(mfccp->mfcc_mcastgrp.s_addr), 939 mfccp->mfcc_parent); 940 941 for (mb_rt = mfctable[hash]; mb_rt; mb_rt = mb_rt->m_next) { 942 943 rt = mtod(mb_rt, struct mfc *); 944 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 945 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) { 946 947 rt->mfc_origin = mfccp->mfcc_origin; 948 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 949 rt->mfc_parent = mfccp->mfcc_parent; 950 for (i = 0; i < numvifs; i++) 951 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 952 /* initialize pkt counters per src-grp */ 953 rt->mfc_pkt_cnt = 0; 954 rt->mfc_byte_cnt = 0; 955 rt->mfc_wrong_if = 0; 956 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 957 if (rt->mfc_expire) 958 nexpire[hash]--; 959 rt->mfc_expire = 0; 960 } 961 } 962 if (mb_rt == NULL) { 963 /* no upcall, so make a new entry */ 964 MGET(mb_rt, M_DONTWAIT, MT_MRTABLE); 965 if (mb_rt == NULL) { 966 splx(s); 967 return ENOBUFS; 968 } 969 970 rt = mtod(mb_rt, struct mfc *); 971 972 /* insert new entry at head of hash chain */ 973 rt->mfc_origin = mfccp->mfcc_origin; 974 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 975 rt->mfc_parent = mfccp->mfcc_parent; 976 for (i = 0; i < numvifs; i++) 977 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 978 /* initialize pkt counters per src-grp */ 979 rt->mfc_pkt_cnt = 0; 980 rt->mfc_byte_cnt = 0; 981 rt->mfc_wrong_if = 0; 982 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 983 rt->mfc_expire = 0; 984 985 /* link into table */ 986 mb_rt->m_next = mfctable[hash]; 987 mfctable[hash] = mb_rt; 988 mb_rt->m_act = NULL; 989 } 990 } 991 splx(s); 992 return 0; 993} 994 995#ifdef UPCALL_TIMING 996/* 997 * collect delay statistics on the upcalls 998 */ 999static void collate(t) 1000register struct timeval *t; 1001{ 1002 register u_long d; 1003 register struct timeval tp; 1004 register u_long delta; 1005 1006 GET_TIME(tp); 1007 1008 if (TV_LT(*t, tp)) 1009 { 1010 TV_DELTA(tp, *t, delta); 1011 1012 d = delta >> 10; 1013 if (d > 50) 1014 d = 50; 1015 1016 ++upcall_data[d]; 1017 } 1018} 1019#endif /* UPCALL_TIMING */ 1020 1021/* 1022 * Delete an mfc entry 1023 */ 1024static int 1025del_mfc(mfccp) 1026 struct mfcctl *mfccp; 1027{ 1028 struct in_addr origin; 1029 struct in_addr mcastgrp; 1030 struct mfc *rt; 1031 struct mbuf *mb_rt; 1032 struct mbuf **nptr; 1033 u_long hash; 1034 int s; 1035 1036 origin = mfccp->mfcc_origin; 1037 mcastgrp = mfccp->mfcc_mcastgrp; 1038 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr); 1039 1040 if (mrtdebug & DEBUG_MFC) 1041 log(LOG_DEBUG,"del_mfc orig %x mcastgrp %x\n", 1042 ntohl(origin.s_addr), ntohl(mcastgrp.s_addr)); 1043 1044 s = splnet(); 1045 1046 nptr = &mfctable[hash]; 1047 while ((mb_rt = *nptr) != NULL) { 1048 rt = mtod(mb_rt, struct mfc *); 1049 if (origin.s_addr == rt->mfc_origin.s_addr && 1050 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr && 1051 mb_rt->m_act == NULL) 1052 break; 1053 1054 nptr = &mb_rt->m_next; 1055 } 1056 if (mb_rt == NULL) { 1057 splx(s); 1058 return EADDRNOTAVAIL; 1059 } 1060 1061 MFREE(mb_rt, *nptr); 1062 1063 splx(s); 1064 1065 return 0; 1066} 1067 1068/* 1069 * Send a message to mrouted on the multicast routing socket 1070 */ 1071static int 1072socket_send(s, mm, src) 1073 struct socket *s; 1074 struct mbuf *mm; 1075 struct sockaddr_in *src; 1076{ 1077 if (s) { 1078 if (sbappendaddr(&s->so_rcv, 1079 (struct sockaddr *)src, 1080 mm, (struct mbuf *)0) != 0) { 1081 sorwakeup(s); 1082 return 0; 1083 } 1084 } 1085 m_freem(mm); 1086 return -1; 1087} 1088 1089/* 1090 * IP multicast forwarding function. This function assumes that the packet 1091 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1092 * pointed to by "ifp", and the packet is to be relayed to other networks 1093 * that have members of the packet's destination IP multicast group. 1094 * 1095 * The packet is returned unscathed to the caller, unless it is 1096 * erroneous, in which case a non-zero return value tells the caller to 1097 * discard it. 1098 */ 1099 1100#define IP_HDR_LEN 20 /* # bytes of fixed IP header (excluding options) */ 1101#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1102 1103static int 1104X_ip_mforward(ip, ifp, m, imo) 1105 register struct ip *ip; 1106 struct ifnet *ifp; 1107 struct mbuf *m; 1108 struct ip_moptions *imo; 1109{ 1110 register struct mfc *rt = 0; /* XXX uninit warning */ 1111 register u_char *ipoptions; 1112 static struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1113 static int srctun = 0; 1114 register struct mbuf *mm; 1115 int s; 1116 vifi_t vifi; 1117 struct vif *vifp; 1118 1119 if (mrtdebug & DEBUG_FORWARD) 1120 log(LOG_DEBUG, "ip_mforward: src %x, dst %x, ifp %x\n", 1121 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), ifp); 1122 1123 if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 || 1124 (ipoptions = (u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1125 /* 1126 * Packet arrived via a physical interface or 1127 * an encapsulated tunnel. 1128 */ 1129 } else { 1130 /* 1131 * Packet arrived through a source-route tunnel. 1132 * Source-route tunnels are no longer supported. 1133 */ 1134 if ((srctun++ % 1000) == 0) 1135 log(LOG_ERR, "ip_mforward: received source-routed packet from %x\n", 1136 ntohl(ip->ip_src.s_addr)); 1137 1138 return 1; 1139 } 1140 1141 if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) { 1142 if (ip->ip_ttl < 255) 1143 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1144 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1145 vifp = viftable + vifi; 1146 printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s%d)\n", 1147 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), vifi, 1148 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1149 vifp->v_ifp->if_name, vifp->v_ifp->if_unit); 1150 } 1151 return (ip_mdq(m, ifp, rt, vifi)); 1152 } 1153 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1154 printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n", 1155 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr)); 1156 if(!imo) 1157 printf("In fact, no options were specified at all\n"); 1158 } 1159 1160 /* 1161 * Don't forward a packet with time-to-live of zero or one, 1162 * or a packet destined to a local-only group. 1163 */ 1164 if (ip->ip_ttl <= 1 || 1165 ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP) 1166 return 0; 1167 1168 /* 1169 * Determine forwarding vifs from the forwarding cache table 1170 */ 1171 s = splnet(); 1172 MFCFIND(ip->ip_src.s_addr, ip->ip_dst.s_addr, rt); 1173 1174 /* Entry exists, so forward if necessary */ 1175 if (rt != NULL) { 1176 splx(s); 1177 return (ip_mdq(m, ifp, rt, -1)); 1178 } else { 1179 /* 1180 * If we don't have a route for packet's origin, 1181 * Make a copy of the packet & 1182 * send message to routing daemon 1183 */ 1184 1185 register struct mbuf *mb_rt; 1186 register struct mbuf *mb_ntry; 1187 register struct mbuf *mb0; 1188 register struct rtdetq *rte; 1189 register struct mbuf *rte_m; 1190 register u_long hash; 1191 register int npkts; 1192#ifdef UPCALL_TIMING 1193 struct timeval tp; 1194 1195 GET_TIME(tp); 1196#endif 1197 1198 mrtstat.mrts_no_route++; 1199 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1200 log(LOG_DEBUG, "ip_mforward: no rte s %x g %x\n", 1201 ntohl(ip->ip_src.s_addr), 1202 ntohl(ip->ip_dst.s_addr)); 1203 1204 /* 1205 * Allocate mbufs early so that we don't do extra work if we are 1206 * just going to fail anyway. 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 == NULL) { 1215 m_free(mb_ntry); 1216 splx(s); 1217 return ENOBUFS; 1218 } 1219 1220 /* is there an upcall waiting for this packet? */ 1221 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1222 for (mb_rt = mfctable[hash]; mb_rt; mb_rt = mb_rt->m_next) { 1223 rt = mtod(mb_rt, struct mfc *); 1224 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) && 1225 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) && 1226 (mb_rt->m_act != NULL)) 1227 break; 1228 } 1229 1230 if (mb_rt == NULL) { 1231 int hlen = ip->ip_hl << 2; 1232 int i; 1233 struct igmpmsg *im; 1234 1235 /* no upcall, so make a new entry */ 1236 MGET(mb_rt, M_DONTWAIT, MT_MRTABLE); 1237 if (mb_rt == NULL) { 1238 m_free(mb_ntry); 1239 m_freem(mb0); 1240 splx(s); 1241 return ENOBUFS; 1242 } 1243 /* Make a copy of the header to send to the user level process */ 1244 mm = m_copy(m, 0, hlen); 1245 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1246 mm = m_pullup(mm, hlen); 1247 if (mm == NULL) { 1248 m_free(mb_ntry); 1249 m_freem(mb0); 1250 m_free(mb_rt); 1251 splx(s); 1252 return ENOBUFS; 1253 } 1254 1255 /* 1256 * Send message to routing daemon to install 1257 * a route into the kernel table 1258 */ 1259 k_igmpsrc.sin_addr = ip->ip_src; 1260 1261 im = mtod(mm, struct igmpmsg *); 1262 im->im_msgtype = IGMPMSG_NOCACHE; 1263 im->im_mbz = 0; 1264 1265 mrtstat.mrts_upcalls++; 1266 1267 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1268 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n"); 1269 ++mrtstat.mrts_upq_sockfull; 1270 m_free(mb_ntry); 1271 m_freem(mb0); 1272 m_free(mb_rt); 1273 splx(s); 1274 return ENOBUFS; 1275 } 1276 1277 rt = mtod(mb_rt, struct mfc *); 1278 1279 /* insert new entry at head of hash chain */ 1280 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1281 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1282 rt->mfc_expire = UPCALL_EXPIRE; 1283 nexpire[hash]++; 1284 for (i = 0; i < numvifs; i++) 1285 rt->mfc_ttls[i] = 0; 1286 rt->mfc_parent = -1; 1287 1288 /* link into table */ 1289 mb_rt->m_next = mfctable[hash]; 1290 mfctable[hash] = mb_rt; 1291 mb_rt->m_act = NULL; 1292 1293 rte_m = mb_rt; 1294 } else { 1295 /* determine if q has overflowed */ 1296 for (rte_m = mb_rt, npkts = 0; rte_m->m_act; rte_m = rte_m->m_act) 1297 npkts++; 1298 1299 if (npkts > MAX_UPQ) { 1300 mrtstat.mrts_upq_ovflw++; 1301 m_free(mb_ntry); 1302 m_freem(mb0); 1303 splx(s); 1304 return 0; 1305 } 1306 } 1307 1308 mb_ntry->m_act = NULL; 1309 rte = mtod(mb_ntry, struct rtdetq *); 1310 1311 rte->m = mb0; 1312 rte->ifp = ifp; 1313#ifdef UPCALL_TIMING 1314 rte->t = tp; 1315#endif 1316 1317 /* Add this entry to the end of the queue */ 1318 rte_m->m_act = mb_ntry; 1319 1320 splx(s); 1321 1322 return 0; 1323 } 1324} 1325 1326#ifndef MROUTE_LKM 1327int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 1328 struct ip_moptions *) = X_ip_mforward; 1329#endif 1330 1331/* 1332 * Clean up the cache entry if upcall is not serviced 1333 */ 1334static void 1335expire_upcalls(void *unused) 1336{ 1337 struct mbuf *mb_rt, *m, **nptr; 1338 struct rtdetq *rte; 1339 struct mfc *mfc; 1340 int i; 1341 int s; 1342 1343 s = splnet(); 1344 for (i = 0; i < MFCTBLSIZ; i++) { 1345 if (nexpire[i] == 0) 1346 continue; 1347 nptr = &mfctable[i]; 1348 for (mb_rt = *nptr; mb_rt != NULL; mb_rt = *nptr) { 1349 mfc = mtod(mb_rt, struct mfc *); 1350 1351 /* 1352 * Skip real cache entries 1353 * Make sure it wasn't marked to not expire (shouldn't happen) 1354 * If it expires now 1355 */ 1356 if (mb_rt->m_act != NULL && 1357 mfc->mfc_expire != 0 && 1358 --mfc->mfc_expire == 0) { 1359 if (mrtdebug & DEBUG_EXPIRE) 1360 log(LOG_DEBUG, "expire_upcalls: expiring (%x %x)\n", 1361 ntohl(mfc->mfc_origin.s_addr), 1362 ntohl(mfc->mfc_mcastgrp.s_addr)); 1363 /* 1364 * drop all the packets 1365 * free the mbuf with the pkt, if, timing info 1366 */ 1367 while (mb_rt->m_act) { 1368 m = mb_rt->m_act; 1369 mb_rt->m_act = m->m_act; 1370 1371 rte = mtod(m, struct rtdetq *); 1372 m_freem(rte->m); 1373 m_free(m); 1374 } 1375 ++mrtstat.mrts_cache_cleanups; 1376 nexpire[i]--; 1377 1378 MFREE(mb_rt, *nptr); 1379 } else { 1380 nptr = &mb_rt->m_next; 1381 } 1382 } 1383 } 1384 splx(s); 1385 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 1386} 1387 1388/* 1389 * Packet forwarding routine once entry in the cache is made 1390 */ 1391static int 1392ip_mdq(m, ifp, rt, xmt_vif) 1393 register struct mbuf *m; 1394 register struct ifnet *ifp; 1395 register struct mfc *rt; 1396 register vifi_t xmt_vif; 1397{ 1398 register struct ip *ip = mtod(m, struct ip *); 1399 register vifi_t vifi; 1400 register struct vif *vifp; 1401 register int plen = ntohs(ip->ip_len); 1402 1403/* 1404 * Macro to send packet on vif. Since RSVP packets don't get counted on 1405 * input, they shouldn't get counted on output, so statistics keeping is 1406 * seperate. 1407 */ 1408#define MC_SEND(ip,vifp,m) { \ 1409 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1410 encap_send((ip), (vifp), (m)); \ 1411 else \ 1412 phyint_send((ip), (vifp), (m)); \ 1413} 1414 1415 /* 1416 * If xmt_vif is not -1, send on only the requested vif. 1417 * 1418 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1419 */ 1420 if (xmt_vif < numvifs) { 1421 MC_SEND(ip, viftable + xmt_vif, m); 1422 return 1; 1423 } 1424 1425 /* 1426 * Don't forward if it didn't arrive from the parent vif for its origin. 1427 */ 1428 vifi = rt->mfc_parent; 1429 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1430 /* came in the wrong interface */ 1431 if (mrtdebug & DEBUG_FORWARD) 1432 log(LOG_DEBUG, "wrong if: ifp %x vifi %d vififp %x\n", 1433 ifp, vifi, viftable[vifi].v_ifp); 1434 ++mrtstat.mrts_wrong_if; 1435 ++rt->mfc_wrong_if; 1436 /* 1437 * If we are doing PIM assert processing, and we are forwarding 1438 * packets on this interface, and it is a broadcast medium 1439 * interface (and not a tunnel), send a message to the routing daemon. 1440 */ 1441 if (pim_assert && rt->mfc_ttls[vifi] && 1442 (ifp->if_flags & IFF_BROADCAST) && 1443 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 1444 struct sockaddr_in k_igmpsrc; 1445 struct mbuf *mm; 1446 struct igmpmsg *im; 1447 int hlen = ip->ip_hl << 2; 1448 struct timeval now; 1449 register u_long delta; 1450 1451 GET_TIME(now); 1452 1453 TV_DELTA(rt->mfc_last_assert, now, delta); 1454 1455 if (delta > ASSERT_MSG_TIME) { 1456 mm = m_copy(m, 0, hlen); 1457 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1458 mm = m_pullup(mm, hlen); 1459 if (mm == NULL) { 1460 return ENOBUFS; 1461 } 1462 1463 rt->mfc_last_assert = now; 1464 1465 im = mtod(mm, struct igmpmsg *); 1466 im->im_msgtype = IGMPMSG_WRONGVIF; 1467 im->im_mbz = 0; 1468 im->im_vif = vifi; 1469 1470 k_igmpsrc.sin_addr = im->im_src; 1471 1472 socket_send(ip_mrouter, mm, &k_igmpsrc); 1473 } 1474 } 1475 return 0; 1476 } 1477 1478 /* If I sourced this packet, it counts as output, else it was input. */ 1479 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) { 1480 viftable[vifi].v_pkt_out++; 1481 viftable[vifi].v_bytes_out += plen; 1482 } else { 1483 viftable[vifi].v_pkt_in++; 1484 viftable[vifi].v_bytes_in += plen; 1485 } 1486 rt->mfc_pkt_cnt++; 1487 rt->mfc_byte_cnt += plen; 1488 1489 /* 1490 * For each vif, decide if a copy of the packet should be forwarded. 1491 * Forward if: 1492 * - the ttl exceeds the vif's threshold 1493 * - there are group members downstream on interface 1494 */ 1495 for (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++) 1496 if ((rt->mfc_ttls[vifi] > 0) && 1497 (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1498 vifp->v_pkt_out++; 1499 vifp->v_bytes_out += plen; 1500 MC_SEND(ip, vifp, m); 1501 } 1502 1503 return 0; 1504} 1505 1506/* 1507 * check if a vif number is legal/ok. This is used by ip_output, to export 1508 * numvifs there, 1509 */ 1510static int 1511X_legal_vif_num(vif) 1512 int vif; 1513{ 1514 if (vif >= 0 && vif < numvifs) 1515 return(1); 1516 else 1517 return(0); 1518} 1519 1520#ifndef MROUTE_LKM 1521int (*legal_vif_num)(int) = X_legal_vif_num; 1522#endif 1523 1524/* 1525 * Return the local address used by this vif 1526 */ 1527static u_long 1528X_ip_mcast_src(vifi) 1529 int vifi; 1530{ 1531 if (vifi >= 0 && vifi < numvifs) 1532 return viftable[vifi].v_lcl_addr.s_addr; 1533 else 1534 return INADDR_ANY; 1535} 1536 1537#ifndef MROUTE_LKM 1538u_long (*ip_mcast_src)(int) = X_ip_mcast_src; 1539#endif 1540 1541static void 1542phyint_send(ip, vifp, m) 1543 struct ip *ip; 1544 struct vif *vifp; 1545 struct mbuf *m; 1546{ 1547 register struct mbuf *mb_copy; 1548 register int hlen = ip->ip_hl << 2; 1549 1550 /* 1551 * Make a new reference to the packet; make sure that 1552 * the IP header is actually copied, not just referenced, 1553 * so that ip_output() only scribbles on the copy. 1554 */ 1555 mb_copy = m_copy(m, 0, M_COPYALL); 1556 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1557 mb_copy = m_pullup(mb_copy, hlen); 1558 if (mb_copy == NULL) 1559 return; 1560 1561 if (vifp->v_rate_limit <= 0) 1562 tbf_send_packet(vifp, mb_copy); 1563 else 1564 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len); 1565} 1566 1567static void 1568encap_send(ip, vifp, m) 1569 register struct ip *ip; 1570 register struct vif *vifp; 1571 register struct mbuf *m; 1572{ 1573 register struct mbuf *mb_copy; 1574 register struct ip *ip_copy; 1575 register int i, len = ip->ip_len; 1576 1577 /* 1578 * copy the old packet & pullup it's IP header into the 1579 * new mbuf so we can modify it. Try to fill the new 1580 * mbuf since if we don't the ethernet driver will. 1581 */ 1582 MGET(mb_copy, M_DONTWAIT, MT_DATA); 1583 if (mb_copy == NULL) 1584 return; 1585 mb_copy->m_data += 16; 1586 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1587 1588 if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1589 m_freem(mb_copy); 1590 return; 1591 } 1592 i = MHLEN - M_LEADINGSPACE(mb_copy); 1593 if (i > len) 1594 i = len; 1595 mb_copy = m_pullup(mb_copy, i); 1596 if (mb_copy == NULL) 1597 return; 1598 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr); 1599 1600 /* 1601 * fill in the encapsulating IP header. 1602 */ 1603 ip_copy = mtod(mb_copy, struct ip *); 1604 *ip_copy = multicast_encap_iphdr; 1605 ip_copy->ip_id = htons(ip_id++); 1606 ip_copy->ip_len += len; 1607 ip_copy->ip_src = vifp->v_lcl_addr; 1608 ip_copy->ip_dst = vifp->v_rmt_addr; 1609 1610 /* 1611 * turn the encapsulated IP header back into a valid one. 1612 */ 1613 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1614 --ip->ip_ttl; 1615 HTONS(ip->ip_len); 1616 HTONS(ip->ip_off); 1617 ip->ip_sum = 0; 1618#if defined(LBL) && !defined(ultrix) 1619 ip->ip_sum = ~oc_cksum((caddr_t)ip, ip->ip_hl << 2, 0); 1620#else 1621 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1622 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1623 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1624#endif 1625 1626 if (vifp->v_rate_limit <= 0) 1627 tbf_send_packet(vifp, mb_copy); 1628 else 1629 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len); 1630} 1631 1632/* 1633 * De-encapsulate a packet and feed it back through ip input (this 1634 * routine is called whenever IP gets a packet with proto type 1635 * ENCAP_PROTO and a local destination address). 1636 */ 1637void 1638#ifdef MROUTE_LKM 1639X_ipip_input(m) 1640#else 1641ipip_input(m, iphlen) 1642#endif 1643 register struct mbuf *m; 1644 int iphlen; 1645{ 1646 struct ifnet *ifp = m->m_pkthdr.rcvif; 1647 register struct ip *ip = mtod(m, struct ip *); 1648 register int hlen = ip->ip_hl << 2; 1649 register int s; 1650 register struct ifqueue *ifq; 1651 register struct vif *vifp; 1652 1653 if (!have_encap_tunnel) { 1654 rip_input(m); 1655 return; 1656 } 1657 /* 1658 * dump the packet if it's not to a multicast destination or if 1659 * we don't have an encapsulating tunnel with the source. 1660 * Note: This code assumes that the remote site IP address 1661 * uniquely identifies the tunnel (i.e., that this site has 1662 * at most one tunnel with the remote site). 1663 */ 1664 if (! IN_MULTICAST(ntohl(((struct ip *)((char *)ip + hlen))->ip_dst.s_addr))) { 1665 ++mrtstat.mrts_bad_tunnel; 1666 m_freem(m); 1667 return; 1668 } 1669 if (ip->ip_src.s_addr != last_encap_src) { 1670 register struct vif *vife; 1671 1672 vifp = viftable; 1673 vife = vifp + numvifs; 1674 last_encap_src = ip->ip_src.s_addr; 1675 last_encap_vif = 0; 1676 for ( ; vifp < vife; ++vifp) 1677 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) { 1678 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) 1679 == VIFF_TUNNEL) 1680 last_encap_vif = vifp; 1681 break; 1682 } 1683 } 1684 if ((vifp = last_encap_vif) == 0) { 1685 last_encap_src = 0; 1686 mrtstat.mrts_cant_tunnel++; /*XXX*/ 1687 m_freem(m); 1688 if (mrtdebug) 1689 log(LOG_DEBUG, "ip_mforward: no tunnel with %x\n", 1690 ntohl(ip->ip_src.s_addr)); 1691 return; 1692 } 1693 ifp = vifp->v_ifp; 1694 1695 if (hlen > IP_HDR_LEN) 1696 ip_stripoptions(m, (struct mbuf *) 0); 1697 m->m_data += IP_HDR_LEN; 1698 m->m_len -= IP_HDR_LEN; 1699 m->m_pkthdr.len -= IP_HDR_LEN; 1700 m->m_pkthdr.rcvif = ifp; 1701 1702 ifq = &ipintrq; 1703 s = splimp(); 1704 if (IF_QFULL(ifq)) { 1705 IF_DROP(ifq); 1706 m_freem(m); 1707 } else { 1708 IF_ENQUEUE(ifq, m); 1709 /* 1710 * normally we would need a "schednetisr(NETISR_IP)" 1711 * here but we were called by ip_input and it is going 1712 * to loop back & try to dequeue the packet we just 1713 * queued as soon as we return so we avoid the 1714 * unnecessary software interrrupt. 1715 */ 1716 } 1717 splx(s); 1718} 1719 1720/* 1721 * Token bucket filter module 1722 */ 1723 1724static void 1725tbf_control(vifp, m, ip, p_len) 1726 register struct vif *vifp; 1727 register struct mbuf *m; 1728 register struct ip *ip; 1729 register u_long p_len; 1730{ 1731 register struct tbf *t = vifp->v_tbf; 1732 1733 if (p_len > MAX_BKT_SIZE) { 1734 /* drop if packet is too large */ 1735 mrtstat.mrts_pkt2large++; 1736 m_freem(m); 1737 return; 1738 } 1739 1740 tbf_update_tokens(vifp); 1741 1742 /* if there are enough tokens, 1743 * and the queue is empty, 1744 * send this packet out 1745 */ 1746 1747 if (t->tbf_q_len == 0) { 1748 /* queue empty, send packet if enough tokens */ 1749 if (p_len <= t->tbf_n_tok) { 1750 t->tbf_n_tok -= p_len; 1751 tbf_send_packet(vifp, m); 1752 } else { 1753 /* queue packet and timeout till later */ 1754 tbf_queue(vifp, m); 1755 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1756 } 1757 } else if (t->tbf_q_len < t->tbf_max_q_len) { 1758 /* finite queue length, so queue pkts and process queue */ 1759 tbf_queue(vifp, m); 1760 tbf_process_q(vifp); 1761 } else { 1762 /* queue length too much, try to dq and queue and process */ 1763 if (!tbf_dq_sel(vifp, ip)) { 1764 mrtstat.mrts_q_overflow++; 1765 m_freem(m); 1766 return; 1767 } else { 1768 tbf_queue(vifp, m); 1769 tbf_process_q(vifp); 1770 } 1771 } 1772 return; 1773} 1774 1775/* 1776 * adds a packet to the queue at the interface 1777 */ 1778static void 1779tbf_queue(vifp, m) 1780 register struct vif *vifp; 1781 register struct mbuf *m; 1782{ 1783 register int s = splnet(); 1784 register struct tbf *t = vifp->v_tbf; 1785 1786 if (t->tbf_t == NULL) { 1787 /* Queue was empty */ 1788 t->tbf_q = m; 1789 } else { 1790 /* Insert at tail */ 1791 t->tbf_t->m_act = m; 1792 } 1793 1794 /* Set new tail pointer */ 1795 t->tbf_t = m; 1796 1797#ifdef DIAGNOSTIC 1798 /* Make sure we didn't get fed a bogus mbuf */ 1799 if (m->m_act) 1800 panic("tbf_queue: m_act"); 1801#endif 1802 m->m_act = NULL; 1803 1804 t->tbf_q_len++; 1805 1806 splx(s); 1807} 1808 1809 1810/* 1811 * processes the queue at the interface 1812 */ 1813static void 1814tbf_process_q(vifp) 1815 register struct vif *vifp; 1816{ 1817 register struct mbuf *m; 1818 register int len; 1819 register int s = splnet(); 1820 register struct tbf *t = vifp->v_tbf; 1821 1822 /* loop through the queue at the interface and send as many packets 1823 * as possible 1824 */ 1825 while (t->tbf_q_len > 0) { 1826 m = t->tbf_q; 1827 1828 len = mtod(m, struct ip *)->ip_len; 1829 1830 /* determine if the packet can be sent */ 1831 if (len <= t->tbf_n_tok) { 1832 /* if so, 1833 * reduce no of tokens, dequeue the packet, 1834 * send the packet. 1835 */ 1836 t->tbf_n_tok -= len; 1837 1838 t->tbf_q = m->m_act; 1839 if (--t->tbf_q_len == 0) 1840 t->tbf_t = NULL; 1841 1842 m->m_act = NULL; 1843 tbf_send_packet(vifp, m); 1844 1845 } else break; 1846 } 1847 splx(s); 1848} 1849 1850static void 1851tbf_reprocess_q(xvifp) 1852 void *xvifp; 1853{ 1854 register struct vif *vifp = xvifp; 1855 if (ip_mrouter == NULL) 1856 return; 1857 1858 tbf_update_tokens(vifp); 1859 1860 tbf_process_q(vifp); 1861 1862 if (vifp->v_tbf->tbf_q_len) 1863 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1864} 1865 1866/* function that will selectively discard a member of the queue 1867 * based on the precedence value and the priority 1868 */ 1869static int 1870tbf_dq_sel(vifp, ip) 1871 register struct vif *vifp; 1872 register struct ip *ip; 1873{ 1874 register int s = splnet(); 1875 register u_int p; 1876 register struct mbuf *m, *last; 1877 register struct mbuf **np; 1878 register struct tbf *t = vifp->v_tbf; 1879 1880 p = priority(vifp, ip); 1881 1882 np = &t->tbf_q; 1883 last = NULL; 1884 while ((m = *np) != NULL) { 1885 if (p > priority(vifp, mtod(m, struct ip *))) { 1886 *np = m->m_act; 1887 /* If we're removing the last packet, fix the tail pointer */ 1888 if (m == t->tbf_t) 1889 t->tbf_t = last; 1890 m_freem(m); 1891 /* it's impossible for the queue to be empty, but 1892 * we check anyway. */ 1893 if (--t->tbf_q_len == 0) 1894 t->tbf_t = NULL; 1895 splx(s); 1896 mrtstat.mrts_drop_sel++; 1897 return(1); 1898 } 1899 np = &m->m_act; 1900 last = m; 1901 } 1902 splx(s); 1903 return(0); 1904} 1905 1906static void 1907tbf_send_packet(vifp, m) 1908 register struct vif *vifp; 1909 register struct mbuf *m; 1910{ 1911 struct ip_moptions imo; 1912 int error; 1913 int s = splnet(); 1914 1915 if (vifp->v_flags & VIFF_TUNNEL) { 1916 /* If tunnel options */ 1917 ip_output(m, (struct mbuf *)0, (struct route *)0, 1918 IP_FORWARDING, (struct ip_moptions *)0); 1919 } else { 1920 imo.imo_multicast_ifp = vifp->v_ifp; 1921 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 1922 imo.imo_multicast_loop = 1; 1923 imo.imo_multicast_vif = -1; 1924 1925 error = ip_output(m, (struct mbuf *)0, (struct route *)0, 1926 IP_FORWARDING, &imo); 1927 1928 if (mrtdebug & DEBUG_XMIT) 1929 log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 1930 vifp - viftable, error); 1931 } 1932 splx(s); 1933} 1934 1935/* determine the current time and then 1936 * the elapsed time (between the last time and time now) 1937 * in milliseconds & update the no. of tokens in the bucket 1938 */ 1939static void 1940tbf_update_tokens(vifp) 1941 register struct vif *vifp; 1942{ 1943 struct timeval tp; 1944 register u_long tm; 1945 register int s = splnet(); 1946 register struct tbf *t = vifp->v_tbf; 1947 1948 GET_TIME(tp); 1949 1950 TV_DELTA(tp, t->tbf_last_pkt_t, tm); 1951 1952 /* 1953 * This formula is actually 1954 * "time in seconds" * "bytes/second". 1955 * 1956 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 1957 * 1958 * The (1000/1024) was introduced in add_vif to optimize 1959 * this divide into a shift. 1960 */ 1961 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8; 1962 t->tbf_last_pkt_t = tp; 1963 1964 if (t->tbf_n_tok > MAX_BKT_SIZE) 1965 t->tbf_n_tok = MAX_BKT_SIZE; 1966 1967 splx(s); 1968} 1969 1970static int 1971priority(vifp, ip) 1972 register struct vif *vifp; 1973 register struct ip *ip; 1974{ 1975 register int prio; 1976 1977 /* temporary hack; may add general packet classifier some day */ 1978 1979 /* 1980 * The UDP port space is divided up into four priority ranges: 1981 * [0, 16384) : unclassified - lowest priority 1982 * [16384, 32768) : audio - highest priority 1983 * [32768, 49152) : whiteboard - medium priority 1984 * [49152, 65536) : video - low priority 1985 */ 1986 if (ip->ip_p == IPPROTO_UDP) { 1987 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 1988 switch (ntohs(udp->uh_dport) & 0xc000) { 1989 case 0x4000: 1990 prio = 70; 1991 break; 1992 case 0x8000: 1993 prio = 60; 1994 break; 1995 case 0xc000: 1996 prio = 55; 1997 break; 1998 default: 1999 prio = 50; 2000 break; 2001 } 2002 if (tbfdebug > 1) 2003 log(LOG_DEBUG, "port %x prio%d\n", ntohs(udp->uh_dport), prio); 2004 } else { 2005 prio = 50; 2006 } 2007 return prio; 2008} 2009 2010/* 2011 * End of token bucket filter modifications 2012 */ 2013 2014int 2015ip_rsvp_vif_init(so, m) 2016 struct socket *so; 2017 struct mbuf *m; 2018{ 2019 int i; 2020 register int s; 2021 2022 if (rsvpdebug) 2023 printf("ip_rsvp_vif_init: so_type = %d, pr_protocol = %d\n", 2024 so->so_type, so->so_proto->pr_protocol); 2025 2026 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2027 return EOPNOTSUPP; 2028 2029 /* Check mbuf. */ 2030 if (m == NULL || m->m_len != sizeof(int)) { 2031 return EINVAL; 2032 } 2033 i = *(mtod(m, int *)); 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, m) 2067 struct socket *so; 2068 struct mbuf *m; 2069{ 2070 int i; 2071 register int s; 2072 2073 if (rsvpdebug) 2074 printf("ip_rsvp_vif_done: so_type = %d, pr_protocol = %d\n", 2075 so->so_type, so->so_proto->pr_protocol); 2076 2077 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2078 return EOPNOTSUPP; 2079 2080 /* Check mbuf. */ 2081 if (m == NULL || m->m_len != sizeof(int)) { 2082 return EINVAL; 2083 } 2084 i = *(mtod(m, int *)); 2085 2086 s = splnet(); 2087 2088 /* Check vif. */ 2089 if (!legal_vif_num(i)) { 2090 splx(s); 2091 return EADDRNOTAVAIL; 2092 } 2093 2094 if (rsvpdebug) 2095 printf("ip_rsvp_vif_done: v_rsvpd = %p so = %p\n", 2096 viftable[i].v_rsvpd, so); 2097 2098 viftable[i].v_rsvpd = NULL; 2099 /* This may seem silly, but we need to be sure we don't over-decrement 2100 * the RSVP counter, in case something slips up. 2101 */ 2102 if (viftable[i].v_rsvp_on) { 2103 viftable[i].v_rsvp_on = 0; 2104 rsvp_on--; 2105 } 2106 2107 splx(s); 2108 return 0; 2109} 2110 2111void 2112ip_rsvp_force_done(so) 2113 struct socket *so; 2114{ 2115 int vifi; 2116 register int s; 2117 2118 /* Don't bother if it is not the right type of socket. */ 2119 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2120 return; 2121 2122 s = splnet(); 2123 2124 /* The socket may be attached to more than one vif...this 2125 * is perfectly legal. 2126 */ 2127 for (vifi = 0; vifi < numvifs; vifi++) { 2128 if (viftable[vifi].v_rsvpd == so) { 2129 viftable[vifi].v_rsvpd = NULL; 2130 /* This may seem silly, but we need to be sure we don't 2131 * over-decrement the RSVP counter, in case something slips up. 2132 */ 2133 if (viftable[vifi].v_rsvp_on) { 2134 viftable[vifi].v_rsvp_on = 0; 2135 rsvp_on--; 2136 } 2137 } 2138 } 2139 2140 splx(s); 2141 return; 2142} 2143 2144void 2145rsvp_input(m, iphlen) 2146 struct mbuf *m; 2147 int iphlen; 2148{ 2149 int vifi; 2150 register struct ip *ip = mtod(m, struct ip *); 2151 static struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET }; 2152 register int s; 2153 struct ifnet *ifp; 2154 2155 if (rsvpdebug) 2156 printf("rsvp_input: rsvp_on %d\n",rsvp_on); 2157 2158 /* Can still get packets with rsvp_on = 0 if there is a local member 2159 * of the group to which the RSVP packet is addressed. But in this 2160 * case we want to throw the packet away. 2161 */ 2162 if (!rsvp_on) { 2163 m_freem(m); 2164 return; 2165 } 2166 2167 /* If the old-style non-vif-associated socket is set, then use 2168 * it and ignore the new ones. 2169 */ 2170 if (ip_rsvpd != NULL) { 2171 if (rsvpdebug) 2172 printf("rsvp_input: Sending packet up old-style socket\n"); 2173 rip_input(m); 2174 return; 2175 } 2176 2177 s = splnet(); 2178 2179 if (rsvpdebug) 2180 printf("rsvp_input: check vifs\n"); 2181 2182#ifdef DIAGNOSTIC 2183 if (!(m->m_flags & M_PKTHDR)) 2184 panic("rsvp_input no hdr"); 2185#endif 2186 2187 ifp = m->m_pkthdr.rcvif; 2188 /* Find which vif the packet arrived on. */ 2189 for (vifi = 0; vifi < numvifs; vifi++) { 2190 if (viftable[vifi].v_ifp == ifp) 2191 break; 2192 } 2193 2194 if (vifi == numvifs) { 2195 /* Can't find vif packet arrived on. Drop packet. */ 2196 if (rsvpdebug) 2197 printf("rsvp_input: Can't find vif for packet...dropping it.\n"); 2198 m_freem(m); 2199 splx(s); 2200 return; 2201 } 2202 2203 if (rsvpdebug) 2204 printf("rsvp_input: check socket\n"); 2205 2206 if (viftable[vifi].v_rsvpd == NULL) { 2207 /* drop packet, since there is no specific socket for this 2208 * interface */ 2209 if (rsvpdebug) 2210 printf("rsvp_input: No socket defined for vif %d\n",vifi); 2211 m_freem(m); 2212 splx(s); 2213 return; 2214 } 2215 rsvp_src.sin_addr = ip->ip_src; 2216 2217 if (rsvpdebug && m) 2218 printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n", 2219 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv))); 2220 2221 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) 2222 if (rsvpdebug) 2223 printf("rsvp_input: Failed to append to socket\n"); 2224 else 2225 if (rsvpdebug) 2226 printf("rsvp_input: send packet up\n"); 2227 2228 splx(s); 2229} 2230 2231#ifdef MROUTE_LKM 2232#include <sys/conf.h> 2233#include <sys/exec.h> 2234#include <sys/sysent.h> 2235#include <sys/lkm.h> 2236 2237MOD_MISC("ip_mroute_mod") 2238 2239static int 2240ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd) 2241{ 2242 int i; 2243 struct lkm_misc *args = lkmtp->private.lkm_misc; 2244 int err = 0; 2245 2246 switch(cmd) { 2247 static int (*old_ip_mrouter_cmd)(); 2248 static int (*old_ip_mrouter_done)(); 2249 static int (*old_ip_mforward)(); 2250 static int (*old_mrt_ioctl)(); 2251 static void (*old_proto4_input)(); 2252 static int (*old_legal_vif_num)(); 2253 extern struct protosw inetsw[]; 2254 2255 case LKM_E_LOAD: 2256 if(lkmexists(lkmtp) || ip_mrtproto) 2257 return(EEXIST); 2258 old_ip_mrouter_cmd = ip_mrouter_cmd; 2259 ip_mrouter_cmd = X_ip_mrouter_cmd; 2260 old_ip_mrouter_done = ip_mrouter_done; 2261 ip_mrouter_done = X_ip_mrouter_done; 2262 old_ip_mforward = ip_mforward; 2263 ip_mforward = X_ip_mforward; 2264 old_mrt_ioctl = mrt_ioctl; 2265 mrt_ioctl = X_mrt_ioctl; 2266 old_proto4_input = inetsw[ip_protox[ENCAP_PROTO]].pr_input; 2267 inetsw[ip_protox[ENCAP_PROTO]].pr_input = X_ipip_input; 2268 old_legal_vif_num = legal_vif_num; 2269 legal_vif_num = X_legal_vif_num; 2270 ip_mrtproto = IGMP_DVMRP; 2271 2272 printf("\nIP multicast routing loaded\n"); 2273 break; 2274 2275 case LKM_E_UNLOAD: 2276 if (ip_mrouter) 2277 return EINVAL; 2278 2279 ip_mrouter_cmd = old_ip_mrouter_cmd; 2280 ip_mrouter_done = old_ip_mrouter_done; 2281 ip_mforward = old_ip_mforward; 2282 mrt_ioctl = old_mrt_ioctl; 2283 inetsw[ip_protox[ENCAP_PROTO]].pr_input = old_proto4_input; 2284 legal_vif_num = old_legal_vif_num; 2285 ip_mrtproto = 0; 2286 break; 2287 2288 default: 2289 err = EINVAL; 2290 break; 2291 } 2292 2293 return(err); 2294} 2295 2296int 2297ip_mroute_mod(struct lkm_table *lkmtp, int cmd, int ver) { 2298 DISPATCH(lkmtp, cmd, ver, ip_mroute_mod_handle, ip_mroute_mod_handle, 2299 nosys); 2300} 2301 2302#endif /* MROUTE_LKM */ 2303#endif /* MROUTING */ 2304