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 1.24 1995/10/29 15:32:35 phk Exp $ 13 */ 14 15 16 #include <sys/param.h> 17 #include <sys/systm.h> 18 #include <sys/mbuf.h> 19 #include <sys/socket.h> 20 #include <sys/socketvar.h> 21 #include <sys/protosw.h> 22 #include <sys/errno.h> 23 #include <sys/time.h> 24 #include <sys/kernel.h> 25 #include <sys/ioctl.h> 26 #include <sys/syslog.h> 27 #include <sys/queue.h> 28 #include <net/if.h> 29 #include <net/route.h> 30 #include <netinet/in.h> 31 #include <netinet/in_systm.h> 32 #include <netinet/ip.h> 33 #include <netinet/ip_var.h> 34 #include <netinet/in_pcb.h> 35 #include <netinet/in_var.h> 36 #include <netinet/igmp.h> 37 #include <netinet/igmp_var.h> 38 #include <netinet/ip_mroute.h> 39 #include <netinet/udp.h> 40 41 #ifndef NTOHL 42 #if BYTE_ORDER != BIG_ENDIAN 43 #define NTOHL(d) ((d) = ntohl((d))) 44 #define NTOHS(d) ((d) = ntohs((u_short)(d))) 45 #define HTONL(d) ((d) = htonl((d))) 46 #define HTONS(d) ((d) = htons((u_short)(d))) 47 #else 48 #define NTOHL(d) 49 #define NTOHS(d) 50 #define HTONL(d) 51 #define HTONS(d) 52 #endif 53 #endif 54 55 #ifndef MROUTING 56 /* 57 * Dummy routines and globals used when multicast routing is not compiled in. 58 */ 59 60 struct socket *ip_mrouter = NULL; 61 static u_int ip_mrtproto = 0; 62 struct mrtstat mrtstat; 63 u_int rsvpdebug = 0; 64 65 int 66 _ip_mrouter_set(cmd, so, m) 67 int cmd; 68 struct socket *so; 69 struct mbuf *m; 70 { 71 return(EOPNOTSUPP); 72 } 73 74 int (*ip_mrouter_set)(int, struct socket *, struct mbuf *) = _ip_mrouter_set; 75 76 77 int 78 _ip_mrouter_get(cmd, so, m) 79 int cmd; 80 struct socket *so; 81 struct mbuf **m; 82 { 83 return(EOPNOTSUPP); 84 } 85 86 int (*ip_mrouter_get)(int, struct socket *, struct mbuf **) = _ip_mrouter_get; 87 88 int 89 _ip_mrouter_done() 90 { 91 return(0); 92 } 93 94 int (*ip_mrouter_done)(void) = _ip_mrouter_done; 95 96 int 97 _ip_mforward(ip, ifp, m, imo) 98 struct ip *ip; 99 struct ifnet *ifp; 100 struct mbuf *m; 101 struct ip_moptions *imo; 102 { 103 return(0); 104 } 105 106 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 107 struct ip_moptions *) = _ip_mforward; 108 109 int 110 _mrt_ioctl(int req, caddr_t data, struct proc *p) 111 { 112 return EOPNOTSUPP; 113 } 114 115 int (*mrt_ioctl)(int, caddr_t, struct proc *) = _mrt_ioctl; 116 117 void 118 rsvp_input(m, iphlen) /* XXX must fixup manually */ 119 struct mbuf *m; 120 int iphlen; 121 { 122 /* Can still get packets with rsvp_on = 0 if there is a local member 123 * of the group to which the RSVP packet is addressed. But in this 124 * case we want to throw the packet away. 125 */ 126 if (!rsvp_on) { 127 m_freem(m); 128 return; 129 } 130 131 if (ip_rsvpd != NULL) { 132 if (rsvpdebug) 133 printf("rsvp_input: Sending packet up old-style socket\n"); 134 rip_input(m); 135 return; 136 } 137 /* Drop the packet */ 138 m_freem(m); 139 } 140 141 void ipip_input(struct mbuf *m) { /* XXX must fixup manually */ 142 rip_input(m); 143 } 144 145 int (*legal_vif_num)(int) = 0; 146 147 /* 148 * This should never be called, since IP_MULTICAST_VIF should fail, but 149 * just in case it does get called, the code a little lower in ip_output 150 * will assign the packet a local address. 151 */ 152 u_long 153 _ip_mcast_src(int vifi) { return INADDR_ANY; } 154 u_long (*ip_mcast_src)(int) = _ip_mcast_src; 155 156 int 157 ip_rsvp_vif_init(so, m) 158 struct socket *so; 159 struct mbuf *m; 160 { 161 return(EINVAL); 162 } 163 164 int 165 ip_rsvp_vif_done(so, m) 166 struct socket *so; 167 struct mbuf *m; 168 { 169 return(EINVAL); 170 } 171 172 void 173 ip_rsvp_force_done(so) 174 struct socket *so; 175 { 176 return; 177 } 178 179 #else /* MROUTING */ 180 181 #define M_HASCL(m) ((m)->m_flags & M_EXT) 182 183 #define INSIZ sizeof(struct in_addr) 184 #define same(a1, a2) \ 185 (bcmp((caddr_t)(a1), (caddr_t)(a2), INSIZ) == 0) 186 187 #define MT_MRTABLE MT_RTABLE /* since nothing else uses it */ 188 189 /* 190 * Globals. All but ip_mrouter and ip_mrtproto could be static, 191 * except for netstat or debugging purposes. 192 */ 193 #ifndef MROUTE_LKM 194 struct socket *ip_mrouter = NULL; 195 struct mrtstat mrtstat; 196 197 int ip_mrtproto = IGMP_DVMRP; /* for netstat only */ 198 #else /* MROUTE_LKM */ 199 extern struct mrtstat mrtstat; 200 static int ip_mrtproto; 201 #endif 202 203 #define NO_RTE_FOUND 0x1 204 #define RTE_FOUND 0x2 205 206 struct mbuf *mfctable[MFCTBLSIZ]; 207 u_char nexpire[MFCTBLSIZ]; 208 struct vif viftable[MAXVIFS]; 209 static u_int mrtdebug = 0; /* debug level */ 210 #define DEBUG_MFC 0x02 211 #define DEBUG_FORWARD 0x04 212 #define DEBUG_EXPIRE 0x08 213 #define DEBUG_XMIT 0x10 214 static u_int tbfdebug = 0; /* tbf debug level */ 215 static u_int rsvpdebug = 0; /* rsvp debug level */ 216 217 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 218 #define UPCALL_EXPIRE 6 /* number of timeouts */ 219 220 /* 221 * Define the token bucket filter structures 222 * tbftable -> each vif has one of these for storing info 223 */ 224 225 struct tbf tbftable[MAXVIFS]; 226 #define TBF_REPROCESS (hz / 100) /* 100x / second */ 227 228 /* 229 * 'Interfaces' associated with decapsulator (so we can tell 230 * packets that went through it from ones that get reflected 231 * by a broken gateway). These interfaces are never linked into 232 * the system ifnet list & no routes point to them. I.e., packets 233 * can't be sent this way. They only exist as a placeholder for 234 * multicast source verification. 235 */ 236 struct ifnet multicast_decap_if[MAXVIFS]; 237 238 #define ENCAP_TTL 64 239 #define ENCAP_PROTO IPPROTO_IPIP /* 4 */ 240 241 /* prototype IP hdr for encapsulated packets */ 242 static struct ip multicast_encap_iphdr = { 243 #if BYTE_ORDER == LITTLE_ENDIAN 244 sizeof(struct ip) >> 2, IPVERSION, 245 #else 246 IPVERSION, sizeof(struct ip) >> 2, 247 #endif 248 0, /* tos */ 249 sizeof(struct ip), /* total length */ 250 0, /* id */ 251 0, /* frag offset */ 252 ENCAP_TTL, ENCAP_PROTO, 253 0, /* checksum */ 254 }; 255 256 /* 257 * Private variables. 258 */ 259 static vifi_t numvifs = 0; 260 static int have_encap_tunnel = 0; 261 262 /* 263 * one-back cache used by ipip_input to locate a tunnel's vif 264 * given a datagram's src ip address. 265 */ 266 static u_long last_encap_src; 267 static struct vif *last_encap_vif; 268 269 static int get_sg_cnt(struct sioc_sg_req *); 270 static int get_vif_cnt(struct sioc_vif_req *); 271 static int ip_mrouter_init(struct socket *, struct mbuf *); 272 static int add_vif(struct vifctl *); 273 static int del_vif(vifi_t *); 274 static int add_mfc(struct mfcctl *); 275 static int del_mfc(struct mfcctl *); 276 static int get_version(struct mbuf *); 277 static int get_assert(struct mbuf *); 278 static int set_assert(int *); 279 static void expire_upcalls(void *); 280 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, 281 vifi_t); 282 static void phyint_send(struct ip *, struct vif *, struct mbuf *); 283 static void encap_send(struct ip *, struct vif *, struct mbuf *); 284 static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long); 285 static void tbf_queue(struct vif *, struct mbuf *); 286 static void tbf_process_q(struct vif *); 287 static void tbf_reprocess_q(void *); 288 static int tbf_dq_sel(struct vif *, struct ip *); 289 static void tbf_send_packet(struct vif *, struct mbuf *); 290 static void tbf_update_tokens(struct vif *); 291 static int priority(struct vif *, struct ip *); 292 void multiencap_decap(struct mbuf *); 293 294 /* 295 * whether or not special PIM assert processing is enabled. 296 */ 297 static int pim_assert; 298 /* 299 * Rate limit for assert notification messages, in usec 300 */ 301 #define ASSERT_MSG_TIME 3000000 302 303 /* 304 * Hash function for a source, group entry 305 */ 306 #define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \ 307 ((g) >> 20) ^ ((g) >> 10) ^ (g)) 308 309 /* 310 * Find a route for a given origin IP address and Multicast group address 311 * Type of service parameter to be added in the future!!! 312 */ 313 314 #define MFCFIND(o, g, rt) { \ 315 register struct mbuf *_mb_rt = mfctable[MFCHASH(o,g)]; \ 316 register struct mfc *_rt = NULL; \ 317 rt = NULL; \ 318 ++mrtstat.mrts_mfc_lookups; \ 319 while (_mb_rt) { \ 320 _rt = mtod(_mb_rt, struct mfc *); \ 321 if ((_rt->mfc_origin.s_addr == o) && \ 322 (_rt->mfc_mcastgrp.s_addr == g) && \ 323 (_mb_rt->m_act == NULL)) { \ 324 rt = _rt; \ 325 break; \ 326 } \ 327 _mb_rt = _mb_rt->m_next; \ 328 } \ 329 if (rt == NULL) { \ 330 ++mrtstat.mrts_mfc_misses; \ 331 } \ 332 } 333 334 335 /* 336 * Macros to compute elapsed time efficiently 337 * Borrowed from Van Jacobson's scheduling code 338 */ 339 #define TV_DELTA(a, b, delta) { \ 340 register int xxs; \ 341 \ 342 delta = (a).tv_usec - (b).tv_usec; \ 343 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 344 switch (xxs) { \ 345 case 2: \ 346 delta += 1000000; \ 347 /* fall through */ \ 348 case 1: \ 349 delta += 1000000; \ 350 break; \ 351 default: \ 352 delta += (1000000 * xxs); \ 353 } \ 354 } \ 355 } 356 357 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 358 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 359 360 #ifdef UPCALL_TIMING 361 u_long upcall_data[51]; 362 static void collate(struct timeval *); 363 #endif /* UPCALL_TIMING */ 364 365 366 /* 367 * Handle MRT setsockopt commands to modify the multicast routing tables. 368 */ 369 static int 370 X_ip_mrouter_set(cmd, so, m) 371 int cmd; 372 struct socket *so; 373 struct mbuf *m; 374 { 375 if (cmd != MRT_INIT && so != ip_mrouter) return EACCES; 376 377 switch (cmd) { 378 case MRT_INIT: return ip_mrouter_init(so, m); 379 case MRT_DONE: return ip_mrouter_done(); 380 case MRT_ADD_VIF: return add_vif (mtod(m, struct vifctl *)); 381 case MRT_DEL_VIF: return del_vif (mtod(m, vifi_t *)); 382 case MRT_ADD_MFC: return add_mfc (mtod(m, struct mfcctl *)); 383 case MRT_DEL_MFC: return del_mfc (mtod(m, struct mfcctl *)); 384 case MRT_ASSERT: return set_assert(mtod(m, int *)); 385 default: return EOPNOTSUPP; 386 } 387 } 388 389 #ifndef MROUTE_LKM 390 int (*ip_mrouter_set)(int, struct socket *, struct mbuf *) = X_ip_mrouter_set; 391 #endif 392 393 /* 394 * Handle MRT getsockopt commands 395 */ 396 static int 397 X_ip_mrouter_get(cmd, so, m) 398 int cmd; 399 struct socket *so; 400 struct mbuf **m; 401 { 402 struct mbuf *mb; 403 404 if (so != ip_mrouter) return EACCES; 405 406 *m = mb = m_get(M_WAIT, MT_SOOPTS); 407 408 switch (cmd) { 409 case MRT_VERSION: return get_version(mb); 410 case MRT_ASSERT: return get_assert(mb); 411 default: return EOPNOTSUPP; 412 } 413 } 414 415 #ifndef MROUTE_LKM 416 int (*ip_mrouter_get)(int, struct socket *, struct mbuf **) = X_ip_mrouter_get; 417 #endif 418 419 /* 420 * Handle ioctl commands to obtain information from the cache 421 */ 422 static int 423 X_mrt_ioctl(cmd, data) 424 int cmd; 425 caddr_t data; 426 { 427 int error = 0; 428 429 switch (cmd) { 430 case (SIOCGETVIFCNT): 431 return (get_vif_cnt((struct sioc_vif_req *)data)); 432 break; 433 case (SIOCGETSGCNT): 434 return (get_sg_cnt((struct sioc_sg_req *)data)); 435 break; 436 default: 437 return (EINVAL); 438 break; 439 } 440 return error; 441 } 442 443 #ifndef MROUTE_LKM 444 int (*mrt_ioctl)(int, caddr_t, struct proc *) = X_mrt_ioctl; 445 #endif 446 447 /* 448 * returns the packet, byte, rpf-failure count for the source group provided 449 */ 450 static int 451 get_sg_cnt(req) 452 register struct sioc_sg_req *req; 453 { 454 register struct mfc *rt; 455 int s; 456 457 s = splnet(); 458 MFCFIND(req->src.s_addr, req->grp.s_addr, rt); 459 splx(s); 460 if (rt != NULL) { 461 req->pktcnt = rt->mfc_pkt_cnt; 462 req->bytecnt = rt->mfc_byte_cnt; 463 req->wrong_if = rt->mfc_wrong_if; 464 } else 465 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 466 467 return 0; 468 } 469 470 /* 471 * returns the input and output packet and byte counts on the vif provided 472 */ 473 static int 474 get_vif_cnt(req) 475 register struct sioc_vif_req *req; 476 { 477 register vifi_t vifi = req->vifi; 478 479 if (vifi >= numvifs) return EINVAL; 480 481 req->icount = viftable[vifi].v_pkt_in; 482 req->ocount = viftable[vifi].v_pkt_out; 483 req->ibytes = viftable[vifi].v_bytes_in; 484 req->obytes = viftable[vifi].v_bytes_out; 485 486 return 0; 487 } 488 489 /* 490 * Enable multicast routing 491 */ 492 static int 493 ip_mrouter_init(so, m) 494 struct socket *so; 495 struct mbuf *m; 496 { 497 int *v; 498 499 if (mrtdebug) 500 log(LOG_DEBUG,"ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 501 so->so_type, so->so_proto->pr_protocol); 502 503 if (so->so_type != SOCK_RAW || 504 so->so_proto->pr_protocol != IPPROTO_IGMP) return EOPNOTSUPP; 505 506 if (!m || (m->m_len != sizeof(int *))) 507 return ENOPROTOOPT; 508 509 v = mtod(m, int *); 510 if (*v != 1) 511 return ENOPROTOOPT; 512 513 if (ip_mrouter != NULL) return EADDRINUSE; 514 515 ip_mrouter = so; 516 517 bzero((caddr_t)mfctable, sizeof(mfctable)); 518 bzero((caddr_t)nexpire, sizeof(nexpire)); 519 520 pim_assert = 0; 521 522 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 523 524 if (mrtdebug) 525 log(LOG_DEBUG, "ip_mrouter_init\n"); 526 527 return 0; 528 } 529 530 /* 531 * Disable multicast routing 532 */ 533 static int 534 X_ip_mrouter_done() 535 { 536 vifi_t vifi; 537 int i; 538 struct ifnet *ifp; 539 struct ifreq ifr; 540 struct mbuf *mb_rt; 541 struct mbuf *m; 542 struct rtdetq *rte; 543 int s; 544 545 s = splnet(); 546 547 /* 548 * For each phyint in use, disable promiscuous reception of all IP 549 * multicasts. 550 */ 551 for (vifi = 0; vifi < numvifs; vifi++) { 552 if (viftable[vifi].v_lcl_addr.s_addr != 0 && 553 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 554 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 555 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr 556 = INADDR_ANY; 557 ifp = viftable[vifi].v_ifp; 558 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 559 } 560 } 561 bzero((caddr_t)tbftable, sizeof(tbftable)); 562 bzero((caddr_t)viftable, sizeof(viftable)); 563 numvifs = 0; 564 pim_assert = 0; 565 566 untimeout(expire_upcalls, (caddr_t)NULL); 567 568 /* 569 * Free all multicast forwarding cache entries. 570 */ 571 for (i = 0; i < MFCTBLSIZ; i++) { 572 mb_rt = mfctable[i]; 573 while (mb_rt) { 574 if (mb_rt->m_act != NULL) { 575 while (mb_rt->m_act) { 576 m = mb_rt->m_act; 577 mb_rt->m_act = m->m_act; 578 rte = mtod(m, struct rtdetq *); 579 m_freem(rte->m); 580 m_free(m); 581 } 582 } 583 mb_rt = m_free(mb_rt); 584 } 585 } 586 587 bzero((caddr_t)mfctable, sizeof(mfctable)); 588 589 /* 590 * Reset de-encapsulation cache 591 */ 592 last_encap_src = NULL; 593 last_encap_vif = NULL; 594 have_encap_tunnel = 0; 595 596 ip_mrouter = NULL; 597 598 splx(s); 599 600 if (mrtdebug) 601 log(LOG_DEBUG, "ip_mrouter_done\n"); 602 603 return 0; 604 } 605 606 #ifndef MROUTE_LKM 607 int (*ip_mrouter_done)(void) = X_ip_mrouter_done; 608 #endif 609 610 static int 611 get_version(mb) 612 struct mbuf *mb; 613 { 614 int *v; 615 616 v = mtod(mb, int *); 617 618 *v = 0x0305; /* XXX !!!! */ 619 mb->m_len = sizeof(int); 620 621 return 0; 622 } 623 624 /* 625 * Set PIM assert processing global 626 */ 627 static int 628 set_assert(i) 629 int *i; 630 { 631 if ((*i != 1) && (*i != 0)) 632 return EINVAL; 633 634 pim_assert = *i; 635 636 return 0; 637 } 638 639 /* 640 * Get PIM assert processing global 641 */ 642 static int 643 get_assert(m) 644 struct mbuf *m; 645 { 646 int *i; 647 648 i = mtod(m, int *); 649 650 *i = pim_assert; 651 652 return 0; 653 } 654 655 /* 656 * Add a vif to the vif table 657 */ 658 static int 659 add_vif(vifcp) 660 register struct vifctl *vifcp; 661 { 662 register struct vif *vifp = viftable + vifcp->vifc_vifi; 663 static struct sockaddr_in sin = {sizeof sin, AF_INET}; 664 struct ifaddr *ifa; 665 struct ifnet *ifp; 666 struct ifreq ifr; 667 int error, s; 668 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi; 669 670 if (vifcp->vifc_vifi >= MAXVIFS) return EINVAL; 671 if (vifp->v_lcl_addr.s_addr != 0) return EADDRINUSE; 672 673 /* Find the interface with an address in AF_INET family */ 674 sin.sin_addr = vifcp->vifc_lcl_addr; 675 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 676 if (ifa == 0) return EADDRNOTAVAIL; 677 ifp = ifa->ifa_ifp; 678 679 if (vifcp->vifc_flags & VIFF_TUNNEL) { 680 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) { 681 /* 682 * An encapsulating tunnel is wanted. Tell ipip_input() to 683 * start paying attention to encapsulated packets. 684 */ 685 if (have_encap_tunnel == 0) { 686 have_encap_tunnel = 1; 687 for (s = 0; s < MAXVIFS; ++s) { 688 multicast_decap_if[s].if_name = "mdecap"; 689 multicast_decap_if[s].if_unit = s; 690 } 691 } 692 /* 693 * Set interface to fake encapsulator interface 694 */ 695 ifp = &multicast_decap_if[vifcp->vifc_vifi]; 696 /* 697 * Prepare cached route entry 698 */ 699 bzero(&vifp->v_route, sizeof(vifp->v_route)); 700 } else { 701 log(LOG_ERR, "source routed tunnels not supported\n"); 702 return EOPNOTSUPP; 703 } 704 } else { 705 /* Make sure the interface supports multicast */ 706 if ((ifp->if_flags & IFF_MULTICAST) == 0) 707 return EOPNOTSUPP; 708 709 /* Enable promiscuous reception of all IP multicasts from the if */ 710 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 711 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY; 712 s = splnet(); 713 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 714 splx(s); 715 if (error) 716 return error; 717 } 718 719 s = splnet(); 720 /* define parameters for the tbf structure */ 721 vifp->v_tbf = v_tbf; 722 GET_TIME(vifp->v_tbf->tbf_last_pkt_t); 723 vifp->v_tbf->tbf_n_tok = 0; 724 vifp->v_tbf->tbf_q_len = 0; 725 vifp->v_tbf->tbf_max_q_len = MAXQSIZE; 726 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL; 727 728 vifp->v_flags = vifcp->vifc_flags; 729 vifp->v_threshold = vifcp->vifc_threshold; 730 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 731 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 732 vifp->v_ifp = ifp; 733 /* scaling up here allows division by 1024 in critical code */ 734 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000; 735 vifp->v_rsvp_on = 0; 736 vifp->v_rsvpd = NULL; 737 /* initialize per vif pkt counters */ 738 vifp->v_pkt_in = 0; 739 vifp->v_pkt_out = 0; 740 vifp->v_bytes_in = 0; 741 vifp->v_bytes_out = 0; 742 splx(s); 743 744 /* Adjust numvifs up if the vifi is higher than numvifs */ 745 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1; 746 747 if (mrtdebug) 748 log(LOG_DEBUG, "add_vif #%d, lcladdr %x, %s %x, thresh %x, rate %d\n", 749 vifcp->vifc_vifi, 750 ntohl(vifcp->vifc_lcl_addr.s_addr), 751 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 752 ntohl(vifcp->vifc_rmt_addr.s_addr), 753 vifcp->vifc_threshold, 754 vifcp->vifc_rate_limit); 755 756 return 0; 757 } 758 759 /* 760 * Delete a vif from the vif table 761 */ 762 static int 763 del_vif(vifip) 764 vifi_t *vifip; 765 { 766 register struct vif *vifp = viftable + *vifip; 767 register vifi_t vifi; 768 register struct mbuf *m; 769 struct ifnet *ifp; 770 struct ifreq ifr; 771 int s; 772 773 if (*vifip >= numvifs) return EINVAL; 774 if (vifp->v_lcl_addr.s_addr == 0) return EADDRNOTAVAIL; 775 776 s = splnet(); 777 778 if (!(vifp->v_flags & VIFF_TUNNEL)) { 779 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 780 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY; 781 ifp = vifp->v_ifp; 782 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 783 } 784 785 if (vifp == last_encap_vif) { 786 last_encap_vif = 0; 787 last_encap_src = 0; 788 } 789 790 /* 791 * Free packets queued at the interface 792 */ 793 while (vifp->v_tbf->tbf_q) { 794 m = vifp->v_tbf->tbf_q; 795 vifp->v_tbf->tbf_q = m->m_act; 796 m_freem(m); 797 } 798 799 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf))); 800 bzero((caddr_t)vifp, sizeof (*vifp)); 801 802 /* Adjust numvifs down */ 803 for (vifi = numvifs; vifi > 0; vifi--) 804 if (viftable[vifi-1].v_lcl_addr.s_addr != 0) break; 805 numvifs = vifi; 806 807 splx(s); 808 809 if (mrtdebug) 810 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", *vifip, numvifs); 811 812 return 0; 813 } 814 815 /* 816 * Add an mfc entry 817 */ 818 static int 819 add_mfc(mfccp) 820 struct mfcctl *mfccp; 821 { 822 struct mfc *rt; 823 register struct mbuf *mb_rt; 824 u_long hash; 825 struct mbuf *mb_ntry; 826 struct rtdetq *rte; 827 register u_short nstl; 828 int s; 829 int i; 830 831 MFCFIND(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr, rt); 832 833 /* If an entry already exists, just update the fields */ 834 if (rt) { 835 if (mrtdebug & DEBUG_MFC) 836 log(LOG_DEBUG,"add_mfc update o %x g %x p %x\n", 837 ntohl(mfccp->mfcc_origin.s_addr), 838 ntohl(mfccp->mfcc_mcastgrp.s_addr), 839 mfccp->mfcc_parent); 840 841 s = splnet(); 842 rt->mfc_parent = mfccp->mfcc_parent; 843 for (i = 0; i < numvifs; i++) 844 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 845 splx(s); 846 return 0; 847 } 848 849 /* 850 * Find the entry for which the upcall was made and update 851 */ 852 s = splnet(); 853 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 854 for (mb_rt = mfctable[hash], nstl = 0; mb_rt; mb_rt = mb_rt->m_next) { 855 856 rt = mtod(mb_rt, struct mfc *); 857 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 858 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) && 859 (mb_rt->m_act != NULL)) { 860 861 if (nstl++) 862 log(LOG_ERR, "add_mfc %s o %x g %x p %x dbx %x\n", 863 "multiple kernel entries", 864 ntohl(mfccp->mfcc_origin.s_addr), 865 ntohl(mfccp->mfcc_mcastgrp.s_addr), 866 mfccp->mfcc_parent, mb_rt->m_act); 867 868 if (mrtdebug & DEBUG_MFC) 869 log(LOG_DEBUG,"add_mfc o %x g %x p %x dbg %x\n", 870 ntohl(mfccp->mfcc_origin.s_addr), 871 ntohl(mfccp->mfcc_mcastgrp.s_addr), 872 mfccp->mfcc_parent, mb_rt->m_act); 873 874 rt->mfc_origin = mfccp->mfcc_origin; 875 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 876 rt->mfc_parent = mfccp->mfcc_parent; 877 for (i = 0; i < numvifs; i++) 878 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 879 /* initialize pkt counters per src-grp */ 880 rt->mfc_pkt_cnt = 0; 881 rt->mfc_byte_cnt = 0; 882 rt->mfc_wrong_if = 0; 883 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 884 885 rt->mfc_expire = 0; /* Don't clean this guy up */ 886 nexpire[hash]--; 887 888 /* free packets Qed at the end of this entry */ 889 while (mb_rt->m_act) { 890 mb_ntry = mb_rt->m_act; 891 rte = mtod(mb_ntry, struct rtdetq *); 892 /* #ifdef RSVP_ISI */ 893 ip_mdq(rte->m, rte->ifp, rt, -1); 894 /* #endif */ 895 mb_rt->m_act = mb_ntry->m_act; 896 m_freem(rte->m); 897 #ifdef UPCALL_TIMING 898 collate(&(rte->t)); 899 #endif /* UPCALL_TIMING */ 900 m_free(mb_ntry); 901 } 902 } 903 } 904 905 /* 906 * It is possible that an entry is being inserted without an upcall 907 */ 908 if (nstl == 0) { 909 if (mrtdebug & DEBUG_MFC) 910 log(LOG_DEBUG,"add_mfc no upcall h %d o %x g %x p %x\n", 911 hash, ntohl(mfccp->mfcc_origin.s_addr), 912 ntohl(mfccp->mfcc_mcastgrp.s_addr), 913 mfccp->mfcc_parent); 914 915 for (mb_rt = mfctable[hash]; mb_rt; mb_rt = mb_rt->m_next) { 916 917 rt = mtod(mb_rt, struct mfc *); 918 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 919 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) { 920 921 rt->mfc_origin = mfccp->mfcc_origin; 922 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 923 rt->mfc_parent = mfccp->mfcc_parent; 924 for (i = 0; i < numvifs; i++) 925 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 926 /* initialize pkt counters per src-grp */ 927 rt->mfc_pkt_cnt = 0; 928 rt->mfc_byte_cnt = 0; 929 rt->mfc_wrong_if = 0; 930 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 931 if (rt->mfc_expire) 932 nexpire[hash]--; 933 rt->mfc_expire = 0; 934 } 935 } 936 if (mb_rt == NULL) { 937 /* no upcall, so make a new entry */ 938 MGET(mb_rt, M_DONTWAIT, MT_MRTABLE); 939 if (mb_rt == NULL) { 940 splx(s); 941 return ENOBUFS; 942 } 943 944 rt = mtod(mb_rt, struct mfc *); 945 946 /* insert new entry at head of hash chain */ 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 rt->mfc_expire = 0; 958 959 /* link into table */ 960 mb_rt->m_next = mfctable[hash]; 961 mfctable[hash] = mb_rt; 962 mb_rt->m_act = NULL; 963 } 964 } 965 splx(s); 966 return 0; 967 } 968 969 #ifdef UPCALL_TIMING 970 /* 971 * collect delay statistics on the upcalls 972 */ 973 static void collate(t) 974 register struct timeval *t; 975 { 976 register u_long d; 977 register struct timeval tp; 978 register u_long delta; 979 980 GET_TIME(tp); 981 982 if (TV_LT(*t, tp)) 983 { 984 TV_DELTA(tp, *t, delta); 985 986 d = delta >> 10; 987 if (d > 50) 988 d = 50; 989 990 ++upcall_data[d]; 991 } 992 } 993 #endif /* UPCALL_TIMING */ 994 995 /* 996 * Delete an mfc entry 997 */ 998 static int 999 del_mfc(mfccp) 1000 struct mfcctl *mfccp; 1001 { 1002 struct in_addr origin; 1003 struct in_addr mcastgrp; 1004 struct mfc *rt; 1005 struct mbuf *mb_rt; 1006 struct mbuf **nptr; 1007 u_long hash; 1008 int s; 1009 1010 origin = mfccp->mfcc_origin; 1011 mcastgrp = mfccp->mfcc_mcastgrp; 1012 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr); 1013 1014 if (mrtdebug & DEBUG_MFC) 1015 log(LOG_DEBUG,"del_mfc orig %x mcastgrp %x\n", 1016 ntohl(origin.s_addr), ntohl(mcastgrp.s_addr)); 1017 1018 s = splnet(); 1019 1020 nptr = &mfctable[hash]; 1021 while ((mb_rt = *nptr) != NULL) { 1022 rt = mtod(mb_rt, struct mfc *); 1023 if (origin.s_addr == rt->mfc_origin.s_addr && 1024 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr && 1025 mb_rt->m_act == NULL) 1026 break; 1027 1028 nptr = &mb_rt->m_next; 1029 } 1030 if (mb_rt == NULL) { 1031 splx(s); 1032 return EADDRNOTAVAIL; 1033 } 1034 1035 MFREE(mb_rt, *nptr); 1036 1037 splx(s); 1038 1039 return 0; 1040 } 1041 1042 /* 1043 * Send a message to mrouted on the multicast routing socket 1044 */ 1045 static int 1046 socket_send(s, mm, src) 1047 struct socket *s; 1048 struct mbuf *mm; 1049 struct sockaddr_in *src; 1050 { 1051 if (s) { 1052 if (sbappendaddr(&s->so_rcv, 1053 (struct sockaddr *)src, 1054 mm, (struct mbuf *)0) != 0) { 1055 sorwakeup(s); 1056 return 0; 1057 } 1058 } 1059 m_freem(mm); 1060 return -1; 1061 } 1062 1063 /* 1064 * IP multicast forwarding function. This function assumes that the packet 1065 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1066 * pointed to by "ifp", and the packet is to be relayed to other networks 1067 * that have members of the packet's destination IP multicast group. 1068 * 1069 * The packet is returned unscathed to the caller, unless it is 1070 * erroneous, in which case a non-zero return value tells the caller to 1071 * discard it. 1072 */ 1073 1074 #define IP_HDR_LEN 20 /* # bytes of fixed IP header (excluding options) */ 1075 #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1076 1077 static int 1078 X_ip_mforward(ip, ifp, m, imo) 1079 register struct ip *ip; 1080 struct ifnet *ifp; 1081 struct mbuf *m; 1082 struct ip_moptions *imo; 1083 { 1084 register struct mfc *rt = 0; /* XXX uninit warning */ 1085 register u_char *ipoptions; 1086 static struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1087 static int srctun = 0; 1088 register struct mbuf *mm; 1089 int s; 1090 vifi_t vifi; 1091 struct vif *vifp; 1092 1093 if (mrtdebug & DEBUG_FORWARD) 1094 log(LOG_DEBUG, "ip_mforward: src %x, dst %x, ifp %x\n", 1095 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), ifp); 1096 1097 if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 || 1098 (ipoptions = (u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1099 /* 1100 * Packet arrived via a physical interface or 1101 * an encapsulated tunnel. 1102 */ 1103 } else { 1104 /* 1105 * Packet arrived through a source-route tunnel. 1106 * Source-route tunnels are no longer supported. 1107 */ 1108 if ((srctun++ % 1000) == 0) 1109 log(LOG_ERR, "ip_mforward: received source-routed packet from %x\n", 1110 ntohl(ip->ip_src.s_addr)); 1111 1112 return 1; 1113 } 1114 1115 if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) { 1116 if (ip->ip_ttl < 255) 1117 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1118 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1119 vifp = viftable + vifi; 1120 printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s%d)\n", 1121 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), vifi, 1122 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1123 vifp->v_ifp->if_name, vifp->v_ifp->if_unit); 1124 } 1125 return (ip_mdq(m, ifp, rt, vifi)); 1126 } 1127 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1128 printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n", 1129 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr)); 1130 if(!imo) 1131 printf("In fact, no options were specified at all\n"); 1132 } 1133 1134 /* 1135 * Don't forward a packet with time-to-live of zero or one, 1136 * or a packet destined to a local-only group. 1137 */ 1138 if (ip->ip_ttl <= 1 || 1139 ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP) 1140 return 0; 1141 1142 /* 1143 * Determine forwarding vifs from the forwarding cache table 1144 */ 1145 s = splnet(); 1146 MFCFIND(ip->ip_src.s_addr, ip->ip_dst.s_addr, rt); 1147 1148 /* Entry exists, so forward if necessary */ 1149 if (rt != NULL) { 1150 splx(s); 1151 return (ip_mdq(m, ifp, rt, -1)); 1152 } else { 1153 /* 1154 * If we don't have a route for packet's origin, 1155 * Make a copy of the packet & 1156 * send message to routing daemon 1157 */ 1158 1159 register struct mbuf *mb_rt; 1160 register struct mbuf *mb_ntry; 1161 register struct mbuf *mb0; 1162 register struct rtdetq *rte; 1163 register struct mbuf *rte_m; 1164 register u_long hash; 1165 register int npkts; 1166 #ifdef UPCALL_TIMING 1167 struct timeval tp; 1168 1169 GET_TIME(tp); 1170 #endif 1171 1172 mrtstat.mrts_no_route++; 1173 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1174 log(LOG_DEBUG, "ip_mforward: no rte s %x g %x\n", 1175 ntohl(ip->ip_src.s_addr), 1176 ntohl(ip->ip_dst.s_addr)); 1177 1178 /* 1179 * Allocate mbufs early so that we don't do extra work if we are 1180 * just going to fail anyway. 1181 */ 1182 MGET(mb_ntry, M_DONTWAIT, MT_DATA); 1183 if (mb_ntry == NULL) { 1184 splx(s); 1185 return ENOBUFS; 1186 } 1187 mb0 = m_copy(m, 0, M_COPYALL); 1188 if (mb0 == NULL) { 1189 m_free(mb_ntry); 1190 splx(s); 1191 return ENOBUFS; 1192 } 1193 1194 /* is there an upcall waiting for this packet? */ 1195 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1196 for (mb_rt = mfctable[hash]; mb_rt; mb_rt = mb_rt->m_next) { 1197 rt = mtod(mb_rt, struct mfc *); 1198 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) && 1199 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) && 1200 (mb_rt->m_act != NULL)) 1201 break; 1202 } 1203 1204 if (mb_rt == NULL) { 1205 int hlen = ip->ip_hl << 2; 1206 int i; 1207 struct igmpmsg *im; 1208 1209 /* no upcall, so make a new entry */ 1210 MGET(mb_rt, M_DONTWAIT, MT_MRTABLE); 1211 if (mb_rt == NULL) { 1212 m_free(mb_ntry); 1213 m_freem(mb0); 1214 splx(s); 1215 return ENOBUFS; 1216 } 1217 /* Make a copy of the header to send to the user level process */ 1218 mm = m_copy(m, 0, hlen); 1219 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1220 mm = m_pullup(mm, hlen); 1221 if (mm == NULL) { 1222 m_free(mb_ntry); 1223 m_freem(mb0); 1224 m_free(mb_rt); 1225 splx(s); 1226 return ENOBUFS; 1227 } 1228 1229 /* 1230 * Send message to routing daemon to install 1231 * a route into the kernel table 1232 */ 1233 k_igmpsrc.sin_addr = ip->ip_src; 1234 1235 im = mtod(mm, struct igmpmsg *); 1236 im->im_msgtype = IGMPMSG_NOCACHE; 1237 im->im_mbz = 0; 1238 1239 mrtstat.mrts_upcalls++; 1240 1241 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1242 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n"); 1243 ++mrtstat.mrts_upq_sockfull; 1244 m_free(mb_ntry); 1245 m_freem(mb0); 1246 m_free(mb_rt); 1247 splx(s); 1248 return ENOBUFS; 1249 } 1250 1251 rt = mtod(mb_rt, struct mfc *); 1252 1253 /* insert new entry at head of hash chain */ 1254 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1255 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1256 rt->mfc_expire = UPCALL_EXPIRE; 1257 nexpire[hash]++; 1258 for (i = 0; i < numvifs; i++) 1259 rt->mfc_ttls[i] = 0; 1260 rt->mfc_parent = -1; 1261 1262 /* link into table */ 1263 mb_rt->m_next = mfctable[hash]; 1264 mfctable[hash] = mb_rt; 1265 mb_rt->m_act = NULL; 1266 1267 rte_m = mb_rt; 1268 } else { 1269 /* determine if q has overflowed */ 1270 for (rte_m = mb_rt, npkts = 0; rte_m->m_act; rte_m = rte_m->m_act) 1271 npkts++; 1272 1273 if (npkts > MAX_UPQ) { 1274 mrtstat.mrts_upq_ovflw++; 1275 m_free(mb_ntry); 1276 m_freem(mb0); 1277 splx(s); 1278 return 0; 1279 } 1280 } 1281 1282 mb_ntry->m_act = NULL; 1283 rte = mtod(mb_ntry, struct rtdetq *); 1284 1285 rte->m = mb0; 1286 rte->ifp = ifp; 1287 #ifdef UPCALL_TIMING 1288 rte->t = tp; 1289 #endif 1290 1291 /* Add this entry to the end of the queue */ 1292 rte_m->m_act = mb_ntry; 1293 1294 splx(s); 1295 1296 return 0; 1297 } 1298 } 1299 1300 #ifndef MROUTE_LKM 1301 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 1302 struct ip_moptions *) = X_ip_mforward; 1303 #endif 1304 1305 /* 1306 * Clean up the cache entry if upcall is not serviced 1307 */ 1308 static void 1309 expire_upcalls(void *unused) 1310 { 1311 struct mbuf *mb_rt, *m, **nptr; 1312 struct rtdetq *rte; 1313 struct mfc *mfc; 1314 int i; 1315 int s; 1316 1317 s = splnet(); 1318 for (i = 0; i < MFCTBLSIZ; i++) { 1319 if (nexpire[i] == 0) 1320 continue; 1321 nptr = &mfctable[i]; 1322 for (mb_rt = *nptr; mb_rt != NULL; mb_rt = *nptr) { 1323 mfc = mtod(mb_rt, struct mfc *); 1324 1325 /* 1326 * Skip real cache entries 1327 * Make sure it wasn't marked to not expire (shouldn't happen) 1328 * If it expires now 1329 */ 1330 if (mb_rt->m_act != NULL && 1331 mfc->mfc_expire != 0 && 1332 --mfc->mfc_expire == 0) { 1333 if (mrtdebug & DEBUG_EXPIRE) 1334 log(LOG_DEBUG, "expire_upcalls: expiring (%x %x)\n", 1335 ntohl(mfc->mfc_origin.s_addr), 1336 ntohl(mfc->mfc_mcastgrp.s_addr)); 1337 /* 1338 * drop all the packets 1339 * free the mbuf with the pkt, if, timing info 1340 */ 1341 while (mb_rt->m_act) { 1342 m = mb_rt->m_act; 1343 mb_rt->m_act = m->m_act; 1344 1345 rte = mtod(m, struct rtdetq *); 1346 m_freem(rte->m); 1347 m_free(m); 1348 } 1349 ++mrtstat.mrts_cache_cleanups; 1350 nexpire[i]--; 1351 1352 MFREE(mb_rt, *nptr); 1353 } else { 1354 nptr = &mb_rt->m_next; 1355 } 1356 } 1357 } 1358 splx(s); 1359 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 1360 } 1361 1362 /* 1363 * Packet forwarding routine once entry in the cache is made 1364 */ 1365 static int 1366 ip_mdq(m, ifp, rt, xmt_vif) 1367 register struct mbuf *m; 1368 register struct ifnet *ifp; 1369 register struct mfc *rt; 1370 register vifi_t xmt_vif; 1371 { 1372 register struct ip *ip = mtod(m, struct ip *); 1373 register vifi_t vifi; 1374 register struct vif *vifp; 1375 register int plen = ntohs(ip->ip_len); 1376 1377 /* 1378 * Macro to send packet on vif. Since RSVP packets don't get counted on 1379 * input, they shouldn't get counted on output, so statistics keeping is 1380 * seperate. 1381 */ 1382 #define MC_SEND(ip,vifp,m) { \ 1383 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1384 encap_send((ip), (vifp), (m)); \ 1385 else \ 1386 phyint_send((ip), (vifp), (m)); \ 1387 } 1388 1389 /* 1390 * If xmt_vif is not -1, send on only the requested vif. 1391 * 1392 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1393 */ 1394 if (xmt_vif < numvifs) { 1395 MC_SEND(ip, viftable + xmt_vif, m); 1396 return 1; 1397 } 1398 1399 /* 1400 * Don't forward if it didn't arrive from the parent vif for its origin. 1401 */ 1402 vifi = rt->mfc_parent; 1403 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1404 /* came in the wrong interface */ 1405 if (mrtdebug & DEBUG_FORWARD) 1406 log(LOG_DEBUG, "wrong if: ifp %x vifi %d vififp %x\n", 1407 ifp, vifi, viftable[vifi].v_ifp); 1408 ++mrtstat.mrts_wrong_if; 1409 ++rt->mfc_wrong_if; 1410 /* 1411 * If we are doing PIM assert processing, and we are forwarding 1412 * packets on this interface, and it is a broadcast medium 1413 * interface (and not a tunnel), send a message to the routing daemon. 1414 */ 1415 if (pim_assert && rt->mfc_ttls[vifi] && 1416 (ifp->if_flags & IFF_BROADCAST) && 1417 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 1418 struct sockaddr_in k_igmpsrc; 1419 struct mbuf *mm; 1420 struct igmpmsg *im; 1421 int hlen = ip->ip_hl << 2; 1422 struct timeval now; 1423 register u_long delta; 1424 1425 GET_TIME(now); 1426 1427 TV_DELTA(rt->mfc_last_assert, now, delta); 1428 1429 if (delta > ASSERT_MSG_TIME) { 1430 mm = m_copy(m, 0, hlen); 1431 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1432 mm = m_pullup(mm, hlen); 1433 if (mm == NULL) { 1434 return ENOBUFS; 1435 } 1436 1437 rt->mfc_last_assert = now; 1438 1439 im = mtod(mm, struct igmpmsg *); 1440 im->im_msgtype = IGMPMSG_WRONGVIF; 1441 im->im_mbz = 0; 1442 im->im_vif = vifi; 1443 1444 k_igmpsrc.sin_addr = im->im_src; 1445 1446 socket_send(ip_mrouter, mm, &k_igmpsrc); 1447 } 1448 } 1449 return 0; 1450 } 1451 1452 /* If I sourced this packet, it counts as output, else it was input. */ 1453 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) { 1454 viftable[vifi].v_pkt_out++; 1455 viftable[vifi].v_bytes_out += plen; 1456 } else { 1457 viftable[vifi].v_pkt_in++; 1458 viftable[vifi].v_bytes_in += plen; 1459 } 1460 rt->mfc_pkt_cnt++; 1461 rt->mfc_byte_cnt += plen; 1462 1463 /* 1464 * For each vif, decide if a copy of the packet should be forwarded. 1465 * Forward if: 1466 * - the ttl exceeds the vif's threshold 1467 * - there are group members downstream on interface 1468 */ 1469 for (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++) 1470 if ((rt->mfc_ttls[vifi] > 0) && 1471 (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1472 vifp->v_pkt_out++; 1473 vifp->v_bytes_out += plen; 1474 MC_SEND(ip, vifp, m); 1475 } 1476 1477 return 0; 1478 } 1479 1480 /* 1481 * check if a vif number is legal/ok. This is used by ip_output, to export 1482 * numvifs there, 1483 */ 1484 static int 1485 X_legal_vif_num(vif) 1486 int vif; 1487 { 1488 if (vif >= 0 && vif < numvifs) 1489 return(1); 1490 else 1491 return(0); 1492 } 1493 1494 #ifndef MROUTE_LKM 1495 int (*legal_vif_num)(int) = X_legal_vif_num; 1496 #endif 1497 1498 /* 1499 * Return the local address used by this vif 1500 */ 1501 static u_long 1502 X_ip_mcast_src(vifi) 1503 int vifi; 1504 { 1505 if (vifi >= 0 && vifi < numvifs) 1506 return viftable[vifi].v_lcl_addr.s_addr; 1507 else 1508 return INADDR_ANY; 1509 } 1510 1511 #ifndef MROUTE_LKM 1512 u_long (*ip_mcast_src)(int) = X_ip_mcast_src; 1513 #endif 1514 1515 static void 1516 phyint_send(ip, vifp, m) 1517 struct ip *ip; 1518 struct vif *vifp; 1519 struct mbuf *m; 1520 { 1521 register struct mbuf *mb_copy; 1522 register int hlen = ip->ip_hl << 2; 1523 1524 /* 1525 * Make a new reference to the packet; make sure that 1526 * the IP header is actually copied, not just referenced, 1527 * so that ip_output() only scribbles on the copy. 1528 */ 1529 mb_copy = m_copy(m, 0, M_COPYALL); 1530 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1531 mb_copy = m_pullup(mb_copy, hlen); 1532 if (mb_copy == NULL) 1533 return; 1534 1535 if (vifp->v_rate_limit <= 0) 1536 tbf_send_packet(vifp, mb_copy); 1537 else 1538 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len); 1539 } 1540 1541 static void 1542 encap_send(ip, vifp, m) 1543 register struct ip *ip; 1544 register struct vif *vifp; 1545 register struct mbuf *m; 1546 { 1547 register struct mbuf *mb_copy; 1548 register struct ip *ip_copy; 1549 register int i, len = ip->ip_len; 1550 1551 /* 1552 * copy the old packet & pullup it's IP header into the 1553 * new mbuf so we can modify it. Try to fill the new 1554 * mbuf since if we don't the ethernet driver will. 1555 */ 1556 MGET(mb_copy, M_DONTWAIT, MT_DATA); 1557 if (mb_copy == NULL) 1558 return; 1559 mb_copy->m_data += 16; 1560 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1561 1562 if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1563 m_freem(mb_copy); 1564 return; 1565 } 1566 i = MHLEN - M_LEADINGSPACE(mb_copy); 1567 if (i > len) 1568 i = len; 1569 mb_copy = m_pullup(mb_copy, i); 1570 if (mb_copy == NULL) 1571 return; 1572 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr); 1573 1574 /* 1575 * fill in the encapsulating IP header. 1576 */ 1577 ip_copy = mtod(mb_copy, struct ip *); 1578 *ip_copy = multicast_encap_iphdr; 1579 ip_copy->ip_id = htons(ip_id++); 1580 ip_copy->ip_len += len; 1581 ip_copy->ip_src = vifp->v_lcl_addr; 1582 ip_copy->ip_dst = vifp->v_rmt_addr; 1583 1584 /* 1585 * turn the encapsulated IP header back into a valid one. 1586 */ 1587 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1588 --ip->ip_ttl; 1589 HTONS(ip->ip_len); 1590 HTONS(ip->ip_off); 1591 ip->ip_sum = 0; 1592 #if defined(LBL) && !defined(ultrix) 1593 ip->ip_sum = ~oc_cksum((caddr_t)ip, ip->ip_hl << 2, 0); 1594 #else 1595 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1596 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1597 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1598 #endif 1599 1600 if (vifp->v_rate_limit <= 0) 1601 tbf_send_packet(vifp, mb_copy); 1602 else 1603 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len); 1604 } 1605 1606 /* 1607 * De-encapsulate a packet and feed it back through ip input (this 1608 * routine is called whenever IP gets a packet with proto type 1609 * ENCAP_PROTO and a local destination address). 1610 */ 1611 void 1612 #ifdef MROUTE_LKM 1613 X_ipip_input(m) 1614 #else 1615 ipip_input(m, iphlen) 1616 #endif 1617 register struct mbuf *m; 1618 int iphlen; 1619 { 1620 struct ifnet *ifp = m->m_pkthdr.rcvif; 1621 register struct ip *ip = mtod(m, struct ip *); 1622 register int hlen = ip->ip_hl << 2; 1623 register int s; 1624 register struct ifqueue *ifq; 1625 register struct vif *vifp; 1626 1627 if (!have_encap_tunnel) { 1628 rip_input(m); 1629 return; 1630 } 1631 /* 1632 * dump the packet if it's not to a multicast destination or if 1633 * we don't have an encapsulating tunnel with the source. 1634 * Note: This code assumes that the remote site IP address 1635 * uniquely identifies the tunnel (i.e., that this site has 1636 * at most one tunnel with the remote site). 1637 */ 1638 if (! IN_MULTICAST(ntohl(((struct ip *)((char *)ip + hlen))->ip_dst.s_addr))) { 1639 ++mrtstat.mrts_bad_tunnel; 1640 m_freem(m); 1641 return; 1642 } 1643 if (ip->ip_src.s_addr != last_encap_src) { 1644 register struct vif *vife; 1645 1646 vifp = viftable; 1647 vife = vifp + numvifs; 1648 last_encap_src = ip->ip_src.s_addr; 1649 last_encap_vif = 0; 1650 for ( ; vifp < vife; ++vifp) 1651 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) { 1652 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) 1653 == VIFF_TUNNEL) 1654 last_encap_vif = vifp; 1655 break; 1656 } 1657 } 1658 if ((vifp = last_encap_vif) == 0) { 1659 last_encap_src = 0; 1660 mrtstat.mrts_cant_tunnel++; /*XXX*/ 1661 m_freem(m); 1662 if (mrtdebug) 1663 log(LOG_DEBUG, "ip_mforward: no tunnel with %x\n", 1664 ntohl(ip->ip_src.s_addr)); 1665 return; 1666 } 1667 ifp = vifp->v_ifp; 1668 1669 if (hlen > IP_HDR_LEN) 1670 ip_stripoptions(m, (struct mbuf *) 0); 1671 m->m_data += IP_HDR_LEN; 1672 m->m_len -= IP_HDR_LEN; 1673 m->m_pkthdr.len -= IP_HDR_LEN; 1674 m->m_pkthdr.rcvif = ifp; 1675 1676 ifq = &ipintrq; 1677 s = splimp(); 1678 if (IF_QFULL(ifq)) { 1679 IF_DROP(ifq); 1680 m_freem(m); 1681 } else { 1682 IF_ENQUEUE(ifq, m); 1683 /* 1684 * normally we would need a "schednetisr(NETISR_IP)" 1685 * here but we were called by ip_input and it is going 1686 * to loop back & try to dequeue the packet we just 1687 * queued as soon as we return so we avoid the 1688 * unnecessary software interrrupt. 1689 */ 1690 } 1691 splx(s); 1692 } 1693 1694 /* 1695 * Token bucket filter module 1696 */ 1697 1698 static void 1699 tbf_control(vifp, m, ip, p_len) 1700 register struct vif *vifp; 1701 register struct mbuf *m; 1702 register struct ip *ip; 1703 register u_long p_len; 1704 { 1705 register struct tbf *t = vifp->v_tbf; 1706 1707 if (p_len > MAX_BKT_SIZE) { 1708 /* drop if packet is too large */ 1709 mrtstat.mrts_pkt2large++; 1710 m_freem(m); 1711 return; 1712 } 1713 1714 tbf_update_tokens(vifp); 1715 1716 /* if there are enough tokens, 1717 * and the queue is empty, 1718 * send this packet out 1719 */ 1720 1721 if (t->tbf_q_len == 0) { 1722 /* queue empty, send packet if enough tokens */ 1723 if (p_len <= t->tbf_n_tok) { 1724 t->tbf_n_tok -= p_len; 1725 tbf_send_packet(vifp, m); 1726 } else { 1727 /* queue packet and timeout till later */ 1728 tbf_queue(vifp, m); 1729 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1730 } 1731 } else if (t->tbf_q_len < t->tbf_max_q_len) { 1732 /* finite queue length, so queue pkts and process queue */ 1733 tbf_queue(vifp, m); 1734 tbf_process_q(vifp); 1735 } else { 1736 /* queue length too much, try to dq and queue and process */ 1737 if (!tbf_dq_sel(vifp, ip)) { 1738 mrtstat.mrts_q_overflow++; 1739 m_freem(m); 1740 return; 1741 } else { 1742 tbf_queue(vifp, m); 1743 tbf_process_q(vifp); 1744 } 1745 } 1746 return; 1747 } 1748 1749 /* 1750 * adds a packet to the queue at the interface 1751 */ 1752 static void 1753 tbf_queue(vifp, m) 1754 register struct vif *vifp; 1755 register struct mbuf *m; 1756 { 1757 register int s = splnet(); 1758 register struct tbf *t = vifp->v_tbf; 1759 1760 if (t->tbf_t == NULL) { 1761 /* Queue was empty */ 1762 t->tbf_q = m; 1763 } else { 1764 /* Insert at tail */ 1765 t->tbf_t->m_act = m; 1766 } 1767 1768 /* Set new tail pointer */ 1769 t->tbf_t = m; 1770 1771 #ifdef DIAGNOSTIC 1772 /* Make sure we didn't get fed a bogus mbuf */ 1773 if (m->m_act) 1774 panic("tbf_queue: m_act"); 1775 #endif 1776 m->m_act = NULL; 1777 1778 t->tbf_q_len++; 1779 1780 splx(s); 1781 } 1782 1783 1784 /* 1785 * processes the queue at the interface 1786 */ 1787 static void 1788 tbf_process_q(vifp) 1789 register struct vif *vifp; 1790 { 1791 register struct mbuf *m; 1792 register int len; 1793 register int s = splnet(); 1794 register struct tbf *t = vifp->v_tbf; 1795 1796 /* loop through the queue at the interface and send as many packets 1797 * as possible 1798 */ 1799 while (t->tbf_q_len > 0) { 1800 m = t->tbf_q; 1801 1802 len = mtod(m, struct ip *)->ip_len; 1803 1804 /* determine if the packet can be sent */ 1805 if (len <= t->tbf_n_tok) { 1806 /* if so, 1807 * reduce no of tokens, dequeue the packet, 1808 * send the packet. 1809 */ 1810 t->tbf_n_tok -= len; 1811 1812 t->tbf_q = m->m_act; 1813 if (--t->tbf_q_len == 0) 1814 t->tbf_t = NULL; 1815 1816 m->m_act = NULL; 1817 tbf_send_packet(vifp, m); 1818 1819 } else break; 1820 } 1821 splx(s); 1822 } 1823 1824 static void 1825 tbf_reprocess_q(xvifp) 1826 void *xvifp; 1827 { 1828 register struct vif *vifp = xvifp; 1829 if (ip_mrouter == NULL) 1830 return; 1831 1832 tbf_update_tokens(vifp); 1833 1834 tbf_process_q(vifp); 1835 1836 if (vifp->v_tbf->tbf_q_len) 1837 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1838 } 1839 1840 /* function that will selectively discard a member of the queue 1841 * based on the precedence value and the priority 1842 */ 1843 static int 1844 tbf_dq_sel(vifp, ip) 1845 register struct vif *vifp; 1846 register struct ip *ip; 1847 { 1848 register int s = splnet(); 1849 register u_int p; 1850 register struct mbuf *m, *last; 1851 register struct mbuf **np; 1852 register struct tbf *t = vifp->v_tbf; 1853 1854 p = priority(vifp, ip); 1855 1856 np = &t->tbf_q; 1857 last = NULL; 1858 while ((m = *np) != NULL) { 1859 if (p > priority(vifp, mtod(m, struct ip *))) { 1860 *np = m->m_act; 1861 /* If we're removing the last packet, fix the tail pointer */ 1862 if (m == t->tbf_t) 1863 t->tbf_t = last; 1864 m_freem(m); 1865 /* it's impossible for the queue to be empty, but 1866 * we check anyway. */ 1867 if (--t->tbf_q_len == 0) 1868 t->tbf_t = NULL; 1869 splx(s); 1870 mrtstat.mrts_drop_sel++; 1871 return(1); 1872 } 1873 np = &m->m_act; 1874 last = m; 1875 } 1876 splx(s); 1877 return(0); 1878 } 1879 1880 static void 1881 tbf_send_packet(vifp, m) 1882 register struct vif *vifp; 1883 register struct mbuf *m; 1884 { 1885 struct ip_moptions imo; 1886 int error; 1887 int s = splnet(); 1888 1889 if (vifp->v_flags & VIFF_TUNNEL) { 1890 /* If tunnel options */ 1891 ip_output(m, (struct mbuf *)0, (struct route *)0, 1892 IP_FORWARDING, (struct ip_moptions *)0); 1893 } else { 1894 imo.imo_multicast_ifp = vifp->v_ifp; 1895 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 1896 imo.imo_multicast_loop = 1; 1897 imo.imo_multicast_vif = -1; 1898 1899 error = ip_output(m, (struct mbuf *)0, (struct route *)0, 1900 IP_FORWARDING, &imo); 1901 1902 if (mrtdebug & DEBUG_XMIT) 1903 log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 1904 vifp - viftable, error); 1905 } 1906 splx(s); 1907 } 1908 1909 /* determine the current time and then 1910 * the elapsed time (between the last time and time now) 1911 * in milliseconds & update the no. of tokens in the bucket 1912 */ 1913 static void 1914 tbf_update_tokens(vifp) 1915 register struct vif *vifp; 1916 { 1917 struct timeval tp; 1918 register u_long tm; 1919 register int s = splnet(); 1920 register struct tbf *t = vifp->v_tbf; 1921 1922 GET_TIME(tp); 1923 1924 TV_DELTA(tp, t->tbf_last_pkt_t, tm); 1925 1926 /* 1927 * This formula is actually 1928 * "time in seconds" * "bytes/second". 1929 * 1930 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 1931 * 1932 * The (1000/1024) was introduced in add_vif to optimize 1933 * this divide into a shift. 1934 */ 1935 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8; 1936 t->tbf_last_pkt_t = tp; 1937 1938 if (t->tbf_n_tok > MAX_BKT_SIZE) 1939 t->tbf_n_tok = MAX_BKT_SIZE; 1940 1941 splx(s); 1942 } 1943 1944 static int 1945 priority(vifp, ip) 1946 register struct vif *vifp; 1947 register struct ip *ip; 1948 { 1949 register int prio; 1950 1951 /* temporary hack; may add general packet classifier some day */ 1952 1953 /* 1954 * The UDP port space is divided up into four priority ranges: 1955 * [0, 16384) : unclassified - lowest priority 1956 * [16384, 32768) : audio - highest priority 1957 * [32768, 49152) : whiteboard - medium priority 1958 * [49152, 65536) : video - low priority 1959 */ 1960 if (ip->ip_p == IPPROTO_UDP) { 1961 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 1962 switch (ntohs(udp->uh_dport) & 0xc000) { 1963 case 0x4000: 1964 prio = 70; 1965 break; 1966 case 0x8000: 1967 prio = 60; 1968 break; 1969 case 0xc000: 1970 prio = 55; 1971 break; 1972 default: 1973 prio = 50; 1974 break; 1975 } 1976 if (tbfdebug > 1) 1977 log(LOG_DEBUG, "port %x prio%d\n", ntohs(udp->uh_dport), prio); 1978 } else { 1979 prio = 50; 1980 } 1981 return prio; 1982 } 1983 1984 /* 1985 * End of token bucket filter modifications 1986 */ 1987 1988 int 1989 ip_rsvp_vif_init(so, m) 1990 struct socket *so; 1991 struct mbuf *m; 1992 { 1993 int i; 1994 register int s; 1995 1996 if (rsvpdebug) 1997 printf("ip_rsvp_vif_init: so_type = %d, pr_protocol = %d\n", 1998 so->so_type, so->so_proto->pr_protocol); 1999 2000 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2001 return EOPNOTSUPP; 2002 2003 /* Check mbuf. */ 2004 if (m == NULL || m->m_len != sizeof(int)) { 2005 return EINVAL; 2006 } 2007 i = *(mtod(m, int *)); 2008 2009 if (rsvpdebug) 2010 printf("ip_rsvp_vif_init: vif = %d rsvp_on = %d\n",i,rsvp_on); 2011 2012 s = splnet(); 2013 2014 /* Check vif. */ 2015 if (!legal_vif_num(i)) { 2016 splx(s); 2017 return EADDRNOTAVAIL; 2018 } 2019 2020 /* Check if socket is available. */ 2021 if (viftable[i].v_rsvpd != NULL) { 2022 splx(s); 2023 return EADDRINUSE; 2024 } 2025 2026 viftable[i].v_rsvpd = so; 2027 /* This may seem silly, but we need to be sure we don't over-increment 2028 * the RSVP counter, in case something slips up. 2029 */ 2030 if (!viftable[i].v_rsvp_on) { 2031 viftable[i].v_rsvp_on = 1; 2032 rsvp_on++; 2033 } 2034 2035 splx(s); 2036 return 0; 2037 } 2038 2039 int 2040 ip_rsvp_vif_done(so, m) 2041 struct socket *so; 2042 struct mbuf *m; 2043 { 2044 int i; 2045 register int s; 2046 2047 if (rsvpdebug) 2048 printf("ip_rsvp_vif_done: so_type = %d, pr_protocol = %d\n", 2049 so->so_type, so->so_proto->pr_protocol); 2050 2051 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2052 return EOPNOTSUPP; 2053 2054 /* Check mbuf. */ 2055 if (m == NULL || m->m_len != sizeof(int)) { 2056 return EINVAL; 2057 } 2058 i = *(mtod(m, int *)); 2059 2060 s = splnet(); 2061 2062 /* Check vif. */ 2063 if (!legal_vif_num(i)) { 2064 splx(s); 2065 return EADDRNOTAVAIL; 2066 } 2067 2068 if (rsvpdebug) 2069 printf("ip_rsvp_vif_done: v_rsvpd = %p so = %p\n", 2070 viftable[i].v_rsvpd, so); 2071 2072 viftable[i].v_rsvpd = NULL; 2073 /* This may seem silly, but we need to be sure we don't over-decrement 2074 * the RSVP counter, in case something slips up. 2075 */ 2076 if (viftable[i].v_rsvp_on) { 2077 viftable[i].v_rsvp_on = 0; 2078 rsvp_on--; 2079 } 2080 2081 splx(s); 2082 return 0; 2083 } 2084 2085 void 2086 ip_rsvp_force_done(so) 2087 struct socket *so; 2088 { 2089 int vifi; 2090 register int s; 2091 2092 /* Don't bother if it is not the right type of socket. */ 2093 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2094 return; 2095 2096 s = splnet(); 2097 2098 /* The socket may be attached to more than one vif...this 2099 * is perfectly legal. 2100 */ 2101 for (vifi = 0; vifi < numvifs; vifi++) { 2102 if (viftable[vifi].v_rsvpd == so) { 2103 viftable[vifi].v_rsvpd = NULL; 2104 /* This may seem silly, but we need to be sure we don't 2105 * over-decrement the RSVP counter, in case something slips up. 2106 */ 2107 if (viftable[vifi].v_rsvp_on) { 2108 viftable[vifi].v_rsvp_on = 0; 2109 rsvp_on--; 2110 } 2111 } 2112 } 2113 2114 splx(s); 2115 return; 2116 } 2117 2118 void 2119 rsvp_input(m, iphlen) 2120 struct mbuf *m; 2121 int iphlen; 2122 { 2123 int vifi; 2124 register struct ip *ip = mtod(m, struct ip *); 2125 static struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET }; 2126 register int s; 2127 struct ifnet *ifp; 2128 2129 if (rsvpdebug) 2130 printf("rsvp_input: rsvp_on %d\n",rsvp_on); 2131 2132 /* Can still get packets with rsvp_on = 0 if there is a local member 2133 * of the group to which the RSVP packet is addressed. But in this 2134 * case we want to throw the packet away. 2135 */ 2136 if (!rsvp_on) { 2137 m_freem(m); 2138 return; 2139 } 2140 2141 /* If the old-style non-vif-associated socket is set, then use 2142 * it and ignore the new ones. 2143 */ 2144 if (ip_rsvpd != NULL) { 2145 if (rsvpdebug) 2146 printf("rsvp_input: Sending packet up old-style socket\n"); 2147 rip_input(m); 2148 return; 2149 } 2150 2151 s = splnet(); 2152 2153 if (rsvpdebug) 2154 printf("rsvp_input: check vifs\n"); 2155 2156 #ifdef DIAGNOSTIC 2157 if (!(m->m_flags & M_PKTHDR)) 2158 panic("rsvp_input no hdr"); 2159 #endif 2160 2161 ifp = m->m_pkthdr.rcvif; 2162 /* Find which vif the packet arrived on. */ 2163 for (vifi = 0; vifi < numvifs; vifi++) { 2164 if (viftable[vifi].v_ifp == ifp) 2165 break; 2166 } 2167 2168 if (vifi == numvifs) { 2169 /* Can't find vif packet arrived on. Drop packet. */ 2170 if (rsvpdebug) 2171 printf("rsvp_input: Can't find vif for packet...dropping it.\n"); 2172 m_freem(m); 2173 splx(s); 2174 return; 2175 } 2176 2177 if (rsvpdebug) 2178 printf("rsvp_input: check socket\n"); 2179 2180 if (viftable[vifi].v_rsvpd == NULL) { 2181 /* drop packet, since there is no specific socket for this 2182 * interface */ 2183 if (rsvpdebug) 2184 printf("rsvp_input: No socket defined for vif %d\n",vifi); 2185 m_freem(m); 2186 splx(s); 2187 return; 2188 } 2189 rsvp_src.sin_addr = ip->ip_src; 2190 2191 if (rsvpdebug && m) 2192 printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n", 2193 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv))); 2194 2195 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) 2196 if (rsvpdebug) 2197 printf("rsvp_input: Failed to append to socket\n"); 2198 else 2199 if (rsvpdebug) 2200 printf("rsvp_input: send packet up\n"); 2201 2202 splx(s); 2203 } 2204 2205 #ifdef MROUTE_LKM 2206 #include <sys/conf.h> 2207 #include <sys/exec.h> 2208 #include <sys/sysent.h> 2209 #include <sys/lkm.h> 2210 2211 MOD_MISC("ip_mroute_mod") 2212 2213 static int 2214 ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd) 2215 { 2216 int i; 2217 struct lkm_misc *args = lkmtp->private.lkm_misc; 2218 int err = 0; 2219 2220 switch(cmd) { 2221 static int (*old_ip_mrouter_cmd)(); 2222 static int (*old_ip_mrouter_done)(); 2223 static int (*old_ip_mforward)(); 2224 static int (*old_mrt_ioctl)(); 2225 static void (*old_proto4_input)(); 2226 static int (*old_legal_vif_num)(); 2227 extern struct protosw inetsw[]; 2228 2229 case LKM_E_LOAD: 2230 if(lkmexists(lkmtp) || ip_mrtproto) 2231 return(EEXIST); 2232 old_ip_mrouter_cmd = ip_mrouter_cmd; 2233 ip_mrouter_cmd = X_ip_mrouter_cmd; 2234 old_ip_mrouter_done = ip_mrouter_done; 2235 ip_mrouter_done = X_ip_mrouter_done; 2236 old_ip_mforward = ip_mforward; 2237 ip_mforward = X_ip_mforward; 2238 old_mrt_ioctl = mrt_ioctl; 2239 mrt_ioctl = X_mrt_ioctl; 2240 old_proto4_input = inetsw[ip_protox[ENCAP_PROTO]].pr_input; 2241 inetsw[ip_protox[ENCAP_PROTO]].pr_input = X_ipip_input; 2242 old_legal_vif_num = legal_vif_num; 2243 legal_vif_num = X_legal_vif_num; 2244 ip_mrtproto = IGMP_DVMRP; 2245 2246 printf("\nIP multicast routing loaded\n"); 2247 break; 2248 2249 case LKM_E_UNLOAD: 2250 if (ip_mrouter) 2251 return EINVAL; 2252 2253 ip_mrouter_cmd = old_ip_mrouter_cmd; 2254 ip_mrouter_done = old_ip_mrouter_done; 2255 ip_mforward = old_ip_mforward; 2256 mrt_ioctl = old_mrt_ioctl; 2257 inetsw[ip_protox[ENCAP_PROTO]].pr_input = old_proto4_input; 2258 legal_vif_num = old_legal_vif_num; 2259 ip_mrtproto = 0; 2260 break; 2261 2262 default: 2263 err = EINVAL; 2264 break; 2265 } 2266 2267 return(err); 2268 } 2269 2270 int 2271 ip_mroute_mod(struct lkm_table *lkmtp, int cmd, int ver) { 2272 DISPATCH(lkmtp, cmd, ver, ip_mroute_mod_handle, ip_mroute_mod_handle, 2273 nosys); 2274 } 2275 2276 #endif /* MROUTE_LKM */ 2277 #endif /* MROUTING */ 2278