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 1.22 1995/08/23 18:20:15 wollman 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 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 extern 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 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 u_int tbfdebug = 0; /* tbf debug level */ 215 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 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 void (*encap_oldrawip)() = 0; 261 static int have_encap_tunnel = 0; 262 263 /* 264 * one-back cache used by ipip_input to locate a tunnel's vif 265 * given a datagram's src ip address. 266 */ 267 static u_long last_encap_src; 268 static struct vif *last_encap_vif; 269 270 static int get_sg_cnt(struct sioc_sg_req *); 271 static int get_vif_cnt(struct sioc_vif_req *); 272 int ip_mrouter_init(struct socket *, struct mbuf *); 273 static int add_vif(struct vifctl *); 274 static int del_vif(vifi_t *); 275 static int add_mfc(struct mfcctl *); 276 static int del_mfc(struct mfcctl *); 277 static int get_version(struct mbuf *); 278 static int get_assert(struct mbuf *); 279 static int set_assert(int *); 280 static void expire_upcalls(void *); 281 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, 282 vifi_t); 283 static void phyint_send(struct ip *, struct vif *, struct mbuf *); 284 static void encap_send(struct ip *, struct vif *, struct mbuf *); 285 static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long); 286 static void tbf_queue(struct vif *, struct mbuf *); 287 static void tbf_process_q(struct vif *); 288 static void tbf_reprocess_q(void *); 289 static int tbf_dq_sel(struct vif *, struct ip *); 290 static void tbf_send_packet(struct vif *, struct mbuf *); 291 static void tbf_update_tokens(struct vif *); 292 static int priority(struct vif *, struct ip *); 293 void multiencap_decap(struct mbuf *); 294 295 /* 296 * whether or not special PIM assert processing is enabled. 297 */ 298 static int pim_assert; 299 /* 300 * Rate limit for assert notification messages, in usec 301 */ 302 #define ASSERT_MSG_TIME 3000000 303 304 /* 305 * Hash function for a source, group entry 306 */ 307 #define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \ 308 ((g) >> 20) ^ ((g) >> 10) ^ (g)) 309 310 /* 311 * Find a route for a given origin IP address and Multicast group address 312 * Type of service parameter to be added in the future!!! 313 */ 314 315 #define MFCFIND(o, g, rt) { \ 316 register struct mbuf *_mb_rt = mfctable[MFCHASH(o,g)]; \ 317 register struct mfc *_rt = NULL; \ 318 rt = NULL; \ 319 ++mrtstat.mrts_mfc_lookups; \ 320 while (_mb_rt) { \ 321 _rt = mtod(_mb_rt, struct mfc *); \ 322 if ((_rt->mfc_origin.s_addr == o) && \ 323 (_rt->mfc_mcastgrp.s_addr == g) && \ 324 (_mb_rt->m_act == NULL)) { \ 325 rt = _rt; \ 326 break; \ 327 } \ 328 _mb_rt = _mb_rt->m_next; \ 329 } \ 330 if (rt == NULL) { \ 331 ++mrtstat.mrts_mfc_misses; \ 332 } \ 333 } 334 335 336 /* 337 * Macros to compute elapsed time efficiently 338 * Borrowed from Van Jacobson's scheduling code 339 */ 340 #define TV_DELTA(a, b, delta) { \ 341 register int xxs; \ 342 \ 343 delta = (a).tv_usec - (b).tv_usec; \ 344 if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 345 switch (xxs) { \ 346 case 2: \ 347 delta += 1000000; \ 348 /* fall through */ \ 349 case 1: \ 350 delta += 1000000; \ 351 break; \ 352 default: \ 353 delta += (1000000 * xxs); \ 354 } \ 355 } \ 356 } 357 358 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 359 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 360 361 #ifdef UPCALL_TIMING 362 u_long upcall_data[51]; 363 static void collate(struct timeval *); 364 #endif /* UPCALL_TIMING */ 365 366 367 /* 368 * Handle MRT setsockopt commands to modify the multicast routing tables. 369 */ 370 int 371 X_ip_mrouter_set(cmd, so, m) 372 int cmd; 373 struct socket *so; 374 struct mbuf *m; 375 { 376 if (cmd != MRT_INIT && so != ip_mrouter) return EACCES; 377 378 switch (cmd) { 379 case MRT_INIT: return ip_mrouter_init(so, m); 380 case MRT_DONE: return ip_mrouter_done(); 381 case MRT_ADD_VIF: return add_vif (mtod(m, struct vifctl *)); 382 case MRT_DEL_VIF: return del_vif (mtod(m, vifi_t *)); 383 case MRT_ADD_MFC: return add_mfc (mtod(m, struct mfcctl *)); 384 case MRT_DEL_MFC: return del_mfc (mtod(m, struct mfcctl *)); 385 case MRT_ASSERT: return set_assert(mtod(m, int *)); 386 default: return EOPNOTSUPP; 387 } 388 } 389 390 #ifndef MROUTE_LKM 391 int (*ip_mrouter_set)(int, struct socket *, struct mbuf *) = X_ip_mrouter_set; 392 #endif 393 394 /* 395 * Handle MRT getsockopt commands 396 */ 397 int 398 X_ip_mrouter_get(cmd, so, m) 399 int cmd; 400 struct socket *so; 401 struct mbuf **m; 402 { 403 struct mbuf *mb; 404 405 if (so != ip_mrouter) return EACCES; 406 407 *m = mb = m_get(M_WAIT, MT_SOOPTS); 408 409 switch (cmd) { 410 case MRT_VERSION: return get_version(mb); 411 case MRT_ASSERT: return get_assert(mb); 412 default: return EOPNOTSUPP; 413 } 414 } 415 416 #ifndef MROUTE_LKM 417 int (*ip_mrouter_get)(int, struct socket *, struct mbuf **) = X_ip_mrouter_get; 418 #endif 419 420 /* 421 * Handle ioctl commands to obtain information from the cache 422 */ 423 int 424 X_mrt_ioctl(cmd, data) 425 int cmd; 426 caddr_t data; 427 { 428 int error = 0; 429 430 switch (cmd) { 431 case (SIOCGETVIFCNT): 432 return (get_vif_cnt((struct sioc_vif_req *)data)); 433 break; 434 case (SIOCGETSGCNT): 435 return (get_sg_cnt((struct sioc_sg_req *)data)); 436 break; 437 default: 438 return (EINVAL); 439 break; 440 } 441 return error; 442 } 443 444 #ifndef MROUTE_LKM 445 int (*mrt_ioctl)(int, caddr_t, struct proc *) = X_mrt_ioctl; 446 #endif 447 448 /* 449 * returns the packet, byte, rpf-failure count for the source group provided 450 */ 451 static int 452 get_sg_cnt(req) 453 register struct sioc_sg_req *req; 454 { 455 register struct mfc *rt; 456 int s; 457 458 s = splnet(); 459 MFCFIND(req->src.s_addr, req->grp.s_addr, rt); 460 splx(s); 461 if (rt != NULL) { 462 req->pktcnt = rt->mfc_pkt_cnt; 463 req->bytecnt = rt->mfc_byte_cnt; 464 req->wrong_if = rt->mfc_wrong_if; 465 } else 466 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 467 468 return 0; 469 } 470 471 /* 472 * returns the input and output packet and byte counts on the vif provided 473 */ 474 static int 475 get_vif_cnt(req) 476 register struct sioc_vif_req *req; 477 { 478 register vifi_t vifi = req->vifi; 479 480 if (vifi >= numvifs) return EINVAL; 481 482 req->icount = viftable[vifi].v_pkt_in; 483 req->ocount = viftable[vifi].v_pkt_out; 484 req->ibytes = viftable[vifi].v_bytes_in; 485 req->obytes = viftable[vifi].v_bytes_out; 486 487 return 0; 488 } 489 490 /* 491 * Enable multicast routing 492 */ 493 int 494 ip_mrouter_init(so, m) 495 struct socket *so; 496 struct mbuf *m; 497 { 498 int *v; 499 int i; 500 501 if (mrtdebug) 502 log(LOG_DEBUG,"ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 503 so->so_type, so->so_proto->pr_protocol); 504 505 if (so->so_type != SOCK_RAW || 506 so->so_proto->pr_protocol != IPPROTO_IGMP) return EOPNOTSUPP; 507 508 if (!m || (m->m_len != sizeof(int *))) 509 return ENOPROTOOPT; 510 511 v = mtod(m, int *); 512 if (*v != 1) 513 return ENOPROTOOPT; 514 515 if (ip_mrouter != NULL) return EADDRINUSE; 516 517 ip_mrouter = so; 518 519 bzero((caddr_t)mfctable, sizeof(mfctable)); 520 bzero((caddr_t)nexpire, sizeof(nexpire)); 521 522 pim_assert = 0; 523 524 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 525 526 if (mrtdebug) 527 log(LOG_DEBUG, "ip_mrouter_init\n"); 528 529 return 0; 530 } 531 532 /* 533 * Disable multicast routing 534 */ 535 int 536 X_ip_mrouter_done() 537 { 538 vifi_t vifi; 539 int i; 540 struct ifnet *ifp; 541 struct ifreq ifr; 542 struct mbuf *mb_rt; 543 struct mfc *rt; 544 struct mbuf *m; 545 struct rtdetq *rte; 546 int s; 547 548 s = splnet(); 549 550 /* 551 * For each phyint in use, disable promiscuous reception of all IP 552 * multicasts. 553 */ 554 for (vifi = 0; vifi < numvifs; vifi++) { 555 if (viftable[vifi].v_lcl_addr.s_addr != 0 && 556 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 557 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 558 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr 559 = INADDR_ANY; 560 ifp = viftable[vifi].v_ifp; 561 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 562 } 563 } 564 bzero((caddr_t)tbftable, sizeof(tbftable)); 565 bzero((caddr_t)viftable, sizeof(viftable)); 566 numvifs = 0; 567 pim_assert = 0; 568 569 untimeout(expire_upcalls, (caddr_t)NULL); 570 571 /* 572 * Free all multicast forwarding cache entries. 573 */ 574 for (i = 0; i < MFCTBLSIZ; i++) { 575 mb_rt = mfctable[i]; 576 while (mb_rt) { 577 if (mb_rt->m_act != NULL) { 578 while (mb_rt->m_act) { 579 m = mb_rt->m_act; 580 mb_rt->m_act = m->m_act; 581 rte = mtod(m, struct rtdetq *); 582 m_freem(rte->m); 583 m_free(m); 584 } 585 } 586 mb_rt = m_free(mb_rt); 587 } 588 } 589 590 bzero((caddr_t)mfctable, sizeof(mfctable)); 591 592 /* 593 * Reset de-encapsulation cache 594 */ 595 last_encap_src = NULL; 596 last_encap_vif = NULL; 597 have_encap_tunnel = 0; 598 599 ip_mrouter = NULL; 600 601 splx(s); 602 603 if (mrtdebug) 604 log(LOG_DEBUG, "ip_mrouter_done\n"); 605 606 return 0; 607 } 608 609 #ifndef MROUTE_LKM 610 int (*ip_mrouter_done)(void) = X_ip_mrouter_done; 611 #endif 612 613 static int 614 get_version(mb) 615 struct mbuf *mb; 616 { 617 int *v; 618 619 v = mtod(mb, int *); 620 621 *v = 0x0305; /* XXX !!!! */ 622 mb->m_len = sizeof(int); 623 624 return 0; 625 } 626 627 /* 628 * Set PIM assert processing global 629 */ 630 static int 631 set_assert(i) 632 int *i; 633 { 634 if ((*i != 1) && (*i != 0)) 635 return EINVAL; 636 637 pim_assert = *i; 638 639 return 0; 640 } 641 642 /* 643 * Get PIM assert processing global 644 */ 645 static int 646 get_assert(m) 647 struct mbuf *m; 648 { 649 int *i; 650 651 i = mtod(m, int *); 652 653 *i = pim_assert; 654 655 return 0; 656 } 657 658 /* 659 * Add a vif to the vif table 660 */ 661 static int 662 add_vif(vifcp) 663 register struct vifctl *vifcp; 664 { 665 register struct vif *vifp = viftable + vifcp->vifc_vifi; 666 static struct sockaddr_in sin = {sizeof sin, AF_INET}; 667 struct ifaddr *ifa; 668 struct ifnet *ifp; 669 struct ifreq ifr; 670 int error, s; 671 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi; 672 673 if (vifcp->vifc_vifi >= MAXVIFS) return EINVAL; 674 if (vifp->v_lcl_addr.s_addr != 0) return EADDRINUSE; 675 676 /* Find the interface with an address in AF_INET family */ 677 sin.sin_addr = vifcp->vifc_lcl_addr; 678 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 679 if (ifa == 0) return EADDRNOTAVAIL; 680 ifp = ifa->ifa_ifp; 681 682 if (vifcp->vifc_flags & VIFF_TUNNEL) { 683 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) { 684 /* 685 * An encapsulating tunnel is wanted. Tell ipip_input() to 686 * start paying attention to encapsulated packets. 687 */ 688 if (have_encap_tunnel == 0) { 689 have_encap_tunnel = 1; 690 for (s = 0; s < MAXVIFS; ++s) { 691 multicast_decap_if[s].if_name = "mdecap"; 692 multicast_decap_if[s].if_unit = s; 693 } 694 } 695 /* 696 * Set interface to fake encapsulator interface 697 */ 698 ifp = &multicast_decap_if[vifcp->vifc_vifi]; 699 /* 700 * Prepare cached route entry 701 */ 702 bzero(&vifp->v_route, sizeof(vifp->v_route)); 703 } else { 704 log(LOG_ERR, "source routed tunnels not supported\n"); 705 return EOPNOTSUPP; 706 } 707 } else { 708 /* Make sure the interface supports multicast */ 709 if ((ifp->if_flags & IFF_MULTICAST) == 0) 710 return EOPNOTSUPP; 711 712 /* Enable promiscuous reception of all IP multicasts from the if */ 713 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 714 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY; 715 s = splnet(); 716 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); 717 splx(s); 718 if (error) 719 return error; 720 } 721 722 s = splnet(); 723 /* define parameters for the tbf structure */ 724 vifp->v_tbf = v_tbf; 725 GET_TIME(vifp->v_tbf->tbf_last_pkt_t); 726 vifp->v_tbf->tbf_n_tok = 0; 727 vifp->v_tbf->tbf_q_len = 0; 728 vifp->v_tbf->tbf_max_q_len = MAXQSIZE; 729 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL; 730 731 vifp->v_flags = vifcp->vifc_flags; 732 vifp->v_threshold = vifcp->vifc_threshold; 733 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 734 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 735 vifp->v_ifp = ifp; 736 /* scaling up here allows division by 1024 in critical code */ 737 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000; 738 vifp->v_rsvp_on = 0; 739 vifp->v_rsvpd = NULL; 740 /* initialize per vif pkt counters */ 741 vifp->v_pkt_in = 0; 742 vifp->v_pkt_out = 0; 743 vifp->v_bytes_in = 0; 744 vifp->v_bytes_out = 0; 745 splx(s); 746 747 /* Adjust numvifs up if the vifi is higher than numvifs */ 748 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1; 749 750 if (mrtdebug) 751 log(LOG_DEBUG, "add_vif #%d, lcladdr %x, %s %x, thresh %x, rate %d\n", 752 vifcp->vifc_vifi, 753 ntohl(vifcp->vifc_lcl_addr.s_addr), 754 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 755 ntohl(vifcp->vifc_rmt_addr.s_addr), 756 vifcp->vifc_threshold, 757 vifcp->vifc_rate_limit); 758 759 return 0; 760 } 761 762 /* 763 * Delete a vif from the vif table 764 */ 765 static int 766 del_vif(vifip) 767 vifi_t *vifip; 768 { 769 register struct vif *vifp = viftable + *vifip; 770 register vifi_t vifi; 771 register struct mbuf *m; 772 struct ifnet *ifp; 773 struct ifreq ifr; 774 int s; 775 776 if (*vifip >= numvifs) return EINVAL; 777 if (vifp->v_lcl_addr.s_addr == 0) return EADDRNOTAVAIL; 778 779 s = splnet(); 780 781 if (!(vifp->v_flags & VIFF_TUNNEL)) { 782 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 783 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY; 784 ifp = vifp->v_ifp; 785 (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); 786 } 787 788 if (vifp == last_encap_vif) { 789 last_encap_vif = 0; 790 last_encap_src = 0; 791 } 792 793 /* 794 * Free packets queued at the interface 795 */ 796 while (vifp->v_tbf->tbf_q) { 797 m = vifp->v_tbf->tbf_q; 798 vifp->v_tbf->tbf_q = m->m_act; 799 m_freem(m); 800 } 801 802 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf))); 803 bzero((caddr_t)vifp, sizeof (*vifp)); 804 805 /* Adjust numvifs down */ 806 for (vifi = numvifs; vifi > 0; vifi--) 807 if (viftable[vifi-1].v_lcl_addr.s_addr != 0) break; 808 numvifs = vifi; 809 810 splx(s); 811 812 if (mrtdebug) 813 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", *vifip, numvifs); 814 815 return 0; 816 } 817 818 /* 819 * Add an mfc entry 820 */ 821 static int 822 add_mfc(mfccp) 823 struct mfcctl *mfccp; 824 { 825 struct mfc *rt; 826 register struct mbuf *mb_rt; 827 u_long hash; 828 struct mbuf *mb_ntry; 829 struct rtdetq *rte; 830 register u_short nstl; 831 int s; 832 int i; 833 834 MFCFIND(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr, rt); 835 836 /* If an entry already exists, just update the fields */ 837 if (rt) { 838 if (mrtdebug & DEBUG_MFC) 839 log(LOG_DEBUG,"add_mfc update o %x g %x p %x\n", 840 ntohl(mfccp->mfcc_origin.s_addr), 841 ntohl(mfccp->mfcc_mcastgrp.s_addr), 842 mfccp->mfcc_parent); 843 844 s = splnet(); 845 rt->mfc_parent = mfccp->mfcc_parent; 846 for (i = 0; i < numvifs; i++) 847 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 848 splx(s); 849 return 0; 850 } 851 852 /* 853 * Find the entry for which the upcall was made and update 854 */ 855 s = splnet(); 856 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 857 for (mb_rt = mfctable[hash], nstl = 0; mb_rt; mb_rt = mb_rt->m_next) { 858 859 rt = mtod(mb_rt, struct mfc *); 860 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 861 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) && 862 (mb_rt->m_act != NULL)) { 863 864 if (nstl++) 865 log(LOG_ERR, "add_mfc %s o %x g %x p %x dbx %x\n", 866 "multiple kernel entries", 867 ntohl(mfccp->mfcc_origin.s_addr), 868 ntohl(mfccp->mfcc_mcastgrp.s_addr), 869 mfccp->mfcc_parent, mb_rt->m_act); 870 871 if (mrtdebug & DEBUG_MFC) 872 log(LOG_DEBUG,"add_mfc o %x g %x p %x dbg %x\n", 873 ntohl(mfccp->mfcc_origin.s_addr), 874 ntohl(mfccp->mfcc_mcastgrp.s_addr), 875 mfccp->mfcc_parent, mb_rt->m_act); 876 877 rt->mfc_origin = mfccp->mfcc_origin; 878 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 879 rt->mfc_parent = mfccp->mfcc_parent; 880 for (i = 0; i < numvifs; i++) 881 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 882 /* initialize pkt counters per src-grp */ 883 rt->mfc_pkt_cnt = 0; 884 rt->mfc_byte_cnt = 0; 885 rt->mfc_wrong_if = 0; 886 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 887 888 rt->mfc_expire = 0; /* Don't clean this guy up */ 889 nexpire[hash]--; 890 891 /* free packets Qed at the end of this entry */ 892 while (mb_rt->m_act) { 893 mb_ntry = mb_rt->m_act; 894 rte = mtod(mb_ntry, struct rtdetq *); 895 /* #ifdef RSVP_ISI */ 896 ip_mdq(rte->m, rte->ifp, rt, -1); 897 /* #endif */ 898 mb_rt->m_act = mb_ntry->m_act; 899 m_freem(rte->m); 900 #ifdef UPCALL_TIMING 901 collate(&(rte->t)); 902 #endif /* UPCALL_TIMING */ 903 m_free(mb_ntry); 904 } 905 } 906 } 907 908 /* 909 * It is possible that an entry is being inserted without an upcall 910 */ 911 if (nstl == 0) { 912 if (mrtdebug & DEBUG_MFC) 913 log(LOG_DEBUG,"add_mfc no upcall h %d o %x g %x p %x\n", 914 hash, ntohl(mfccp->mfcc_origin.s_addr), 915 ntohl(mfccp->mfcc_mcastgrp.s_addr), 916 mfccp->mfcc_parent); 917 918 for (mb_rt = mfctable[hash]; mb_rt; mb_rt = mb_rt->m_next) { 919 920 rt = mtod(mb_rt, struct mfc *); 921 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 922 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) { 923 924 rt->mfc_origin = mfccp->mfcc_origin; 925 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 926 rt->mfc_parent = mfccp->mfcc_parent; 927 for (i = 0; i < numvifs; i++) 928 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 929 /* initialize pkt counters per src-grp */ 930 rt->mfc_pkt_cnt = 0; 931 rt->mfc_byte_cnt = 0; 932 rt->mfc_wrong_if = 0; 933 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 934 if (rt->mfc_expire) 935 nexpire[hash]--; 936 rt->mfc_expire = 0; 937 } 938 } 939 if (mb_rt == NULL) { 940 /* no upcall, so make a new entry */ 941 MGET(mb_rt, M_DONTWAIT, MT_MRTABLE); 942 if (mb_rt == NULL) { 943 splx(s); 944 return ENOBUFS; 945 } 946 947 rt = mtod(mb_rt, struct mfc *); 948 949 /* insert new entry at head of hash chain */ 950 rt->mfc_origin = mfccp->mfcc_origin; 951 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 952 rt->mfc_parent = mfccp->mfcc_parent; 953 for (i = 0; i < numvifs; i++) 954 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 955 /* initialize pkt counters per src-grp */ 956 rt->mfc_pkt_cnt = 0; 957 rt->mfc_byte_cnt = 0; 958 rt->mfc_wrong_if = 0; 959 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 960 rt->mfc_expire = 0; 961 962 /* link into table */ 963 mb_rt->m_next = mfctable[hash]; 964 mfctable[hash] = mb_rt; 965 mb_rt->m_act = NULL; 966 } 967 } 968 splx(s); 969 return 0; 970 } 971 972 #ifdef UPCALL_TIMING 973 /* 974 * collect delay statistics on the upcalls 975 */ 976 static void collate(t) 977 register struct timeval *t; 978 { 979 register u_long d; 980 register struct timeval tp; 981 register u_long delta; 982 983 GET_TIME(tp); 984 985 if (TV_LT(*t, tp)) 986 { 987 TV_DELTA(tp, *t, delta); 988 989 d = delta >> 10; 990 if (d > 50) 991 d = 50; 992 993 ++upcall_data[d]; 994 } 995 } 996 #endif /* UPCALL_TIMING */ 997 998 /* 999 * Delete an mfc entry 1000 */ 1001 static int 1002 del_mfc(mfccp) 1003 struct mfcctl *mfccp; 1004 { 1005 struct in_addr origin; 1006 struct in_addr mcastgrp; 1007 struct mfc *rt; 1008 struct mbuf *mb_rt; 1009 struct mbuf **nptr; 1010 u_long hash; 1011 int s, i; 1012 1013 origin = mfccp->mfcc_origin; 1014 mcastgrp = mfccp->mfcc_mcastgrp; 1015 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr); 1016 1017 if (mrtdebug & DEBUG_MFC) 1018 log(LOG_DEBUG,"del_mfc orig %x mcastgrp %x\n", 1019 ntohl(origin.s_addr), ntohl(mcastgrp.s_addr)); 1020 1021 s = splnet(); 1022 1023 nptr = &mfctable[hash]; 1024 while ((mb_rt = *nptr) != NULL) { 1025 rt = mtod(mb_rt, struct mfc *); 1026 if (origin.s_addr == rt->mfc_origin.s_addr && 1027 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr && 1028 mb_rt->m_act == NULL) 1029 break; 1030 1031 nptr = &mb_rt->m_next; 1032 } 1033 if (mb_rt == NULL) { 1034 splx(s); 1035 return EADDRNOTAVAIL; 1036 } 1037 1038 MFREE(mb_rt, *nptr); 1039 1040 splx(s); 1041 1042 return 0; 1043 } 1044 1045 /* 1046 * Send a message to mrouted on the multicast routing socket 1047 */ 1048 static int 1049 socket_send(s, mm, src) 1050 struct socket *s; 1051 struct mbuf *mm; 1052 struct sockaddr_in *src; 1053 { 1054 if (s) { 1055 if (sbappendaddr(&s->so_rcv, 1056 (struct sockaddr *)src, 1057 mm, (struct mbuf *)0) != 0) { 1058 sorwakeup(s); 1059 return 0; 1060 } 1061 } 1062 m_freem(mm); 1063 return -1; 1064 } 1065 1066 /* 1067 * IP multicast forwarding function. This function assumes that the packet 1068 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 1069 * pointed to by "ifp", and the packet is to be relayed to other networks 1070 * that have members of the packet's destination IP multicast group. 1071 * 1072 * The packet is returned unscathed to the caller, unless it is 1073 * erroneous, in which case a non-zero return value tells the caller to 1074 * discard it. 1075 */ 1076 1077 #define IP_HDR_LEN 20 /* # bytes of fixed IP header (excluding options) */ 1078 #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 1079 1080 int 1081 X_ip_mforward(ip, ifp, m, imo) 1082 register struct ip *ip; 1083 struct ifnet *ifp; 1084 struct mbuf *m; 1085 struct ip_moptions *imo; 1086 { 1087 register struct mfc *rt = 0; /* XXX uninit warning */ 1088 register u_char *ipoptions; 1089 static struct sockproto k_igmpproto = { AF_INET, IPPROTO_IGMP }; 1090 static struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1091 static int srctun = 0; 1092 register struct mbuf *mm; 1093 int s; 1094 vifi_t vifi; 1095 struct vif *vifp; 1096 1097 if (mrtdebug & DEBUG_FORWARD) 1098 log(LOG_DEBUG, "ip_mforward: src %x, dst %x, ifp %x\n", 1099 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), ifp); 1100 1101 if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 || 1102 (ipoptions = (u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 1103 /* 1104 * Packet arrived via a physical interface or 1105 * an encapsulated tunnel. 1106 */ 1107 } else { 1108 /* 1109 * Packet arrived through a source-route tunnel. 1110 * Source-route tunnels are no longer supported. 1111 */ 1112 if ((srctun++ % 1000) == 0) 1113 log(LOG_ERR, "ip_mforward: received source-routed packet from %x\n", 1114 ntohl(ip->ip_src.s_addr)); 1115 1116 return 1; 1117 } 1118 1119 if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) { 1120 if (ip->ip_ttl < 255) 1121 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 1122 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1123 vifp = viftable + vifi; 1124 printf("Sending IPPROTO_RSVP from %x to %x on vif %d (%s%s%d)\n", 1125 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), vifi, 1126 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1127 vifp->v_ifp->if_name, vifp->v_ifp->if_unit); 1128 } 1129 return (ip_mdq(m, ifp, rt, vifi)); 1130 } 1131 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1132 printf("Warning: IPPROTO_RSVP from %x to %x without vif option\n", 1133 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr)); 1134 if(!imo) 1135 printf("In fact, no options were specified at all\n"); 1136 } 1137 1138 /* 1139 * Don't forward a packet with time-to-live of zero or one, 1140 * or a packet destined to a local-only group. 1141 */ 1142 if (ip->ip_ttl <= 1 || 1143 ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP) 1144 return 0; 1145 1146 /* 1147 * Determine forwarding vifs from the forwarding cache table 1148 */ 1149 s = splnet(); 1150 MFCFIND(ip->ip_src.s_addr, ip->ip_dst.s_addr, rt); 1151 1152 /* Entry exists, so forward if necessary */ 1153 if (rt != NULL) { 1154 splx(s); 1155 return (ip_mdq(m, ifp, rt, -1)); 1156 } else { 1157 /* 1158 * If we don't have a route for packet's origin, 1159 * Make a copy of the packet & 1160 * send message to routing daemon 1161 */ 1162 1163 register struct mbuf *mb_rt; 1164 register struct mbuf *mb_ntry; 1165 register struct mbuf *mb0; 1166 register struct rtdetq *rte; 1167 register struct mbuf *rte_m; 1168 register u_long hash; 1169 register int npkts; 1170 #ifdef UPCALL_TIMING 1171 struct timeval tp; 1172 1173 GET_TIME(tp); 1174 #endif 1175 1176 mrtstat.mrts_no_route++; 1177 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1178 log(LOG_DEBUG, "ip_mforward: no rte s %x g %x\n", 1179 ntohl(ip->ip_src.s_addr), 1180 ntohl(ip->ip_dst.s_addr)); 1181 1182 /* 1183 * Allocate mbufs early so that we don't do extra work if we are 1184 * just going to fail anyway. 1185 */ 1186 MGET(mb_ntry, M_DONTWAIT, MT_DATA); 1187 if (mb_ntry == NULL) { 1188 splx(s); 1189 return ENOBUFS; 1190 } 1191 mb0 = m_copy(m, 0, M_COPYALL); 1192 if (mb0 == NULL) { 1193 m_free(mb_ntry); 1194 splx(s); 1195 return ENOBUFS; 1196 } 1197 1198 /* is there an upcall waiting for this packet? */ 1199 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1200 for (mb_rt = mfctable[hash]; mb_rt; mb_rt = mb_rt->m_next) { 1201 rt = mtod(mb_rt, struct mfc *); 1202 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) && 1203 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) && 1204 (mb_rt->m_act != NULL)) 1205 break; 1206 } 1207 1208 if (mb_rt == NULL) { 1209 int hlen = ip->ip_hl << 2; 1210 int i; 1211 struct igmpmsg *im; 1212 1213 /* no upcall, so make a new entry */ 1214 MGET(mb_rt, M_DONTWAIT, MT_MRTABLE); 1215 if (mb_rt == NULL) { 1216 m_free(mb_ntry); 1217 m_freem(mb0); 1218 splx(s); 1219 return ENOBUFS; 1220 } 1221 /* Make a copy of the header to send to the user level process */ 1222 mm = m_copy(m, 0, hlen); 1223 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1224 mm = m_pullup(mm, hlen); 1225 if (mm == NULL) { 1226 m_free(mb_ntry); 1227 m_freem(mb0); 1228 m_free(mb_rt); 1229 splx(s); 1230 return ENOBUFS; 1231 } 1232 1233 /* 1234 * Send message to routing daemon to install 1235 * a route into the kernel table 1236 */ 1237 k_igmpsrc.sin_addr = ip->ip_src; 1238 1239 im = mtod(mm, struct igmpmsg *); 1240 im->im_msgtype = IGMPMSG_NOCACHE; 1241 im->im_mbz = 0; 1242 1243 mrtstat.mrts_upcalls++; 1244 1245 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1246 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n"); 1247 ++mrtstat.mrts_upq_sockfull; 1248 m_free(mb_ntry); 1249 m_freem(mb0); 1250 m_free(mb_rt); 1251 splx(s); 1252 return ENOBUFS; 1253 } 1254 1255 rt = mtod(mb_rt, struct mfc *); 1256 1257 /* insert new entry at head of hash chain */ 1258 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1259 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1260 rt->mfc_expire = UPCALL_EXPIRE; 1261 nexpire[hash]++; 1262 for (i = 0; i < numvifs; i++) 1263 rt->mfc_ttls[i] = 0; 1264 rt->mfc_parent = -1; 1265 1266 /* link into table */ 1267 mb_rt->m_next = mfctable[hash]; 1268 mfctable[hash] = mb_rt; 1269 mb_rt->m_act = NULL; 1270 1271 rte_m = mb_rt; 1272 } else { 1273 /* determine if q has overflowed */ 1274 for (rte_m = mb_rt, npkts = 0; rte_m->m_act; rte_m = rte_m->m_act) 1275 npkts++; 1276 1277 if (npkts > MAX_UPQ) { 1278 mrtstat.mrts_upq_ovflw++; 1279 m_free(mb_ntry); 1280 m_freem(mb0); 1281 splx(s); 1282 return 0; 1283 } 1284 } 1285 1286 mb_ntry->m_act = NULL; 1287 rte = mtod(mb_ntry, struct rtdetq *); 1288 1289 rte->m = mb0; 1290 rte->ifp = ifp; 1291 #ifdef UPCALL_TIMING 1292 rte->t = tp; 1293 #endif 1294 1295 /* Add this entry to the end of the queue */ 1296 rte_m->m_act = mb_ntry; 1297 1298 splx(s); 1299 1300 return 0; 1301 } 1302 } 1303 1304 #ifndef MROUTE_LKM 1305 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 1306 struct ip_moptions *) = X_ip_mforward; 1307 #endif 1308 1309 /* 1310 * Clean up the cache entry if upcall is not serviced 1311 */ 1312 static void 1313 expire_upcalls(void *unused) 1314 { 1315 struct mbuf *mb_rt, *m, **nptr; 1316 struct rtdetq *rte; 1317 struct mfc *mfc; 1318 int i; 1319 int s; 1320 1321 s = splnet(); 1322 for (i = 0; i < MFCTBLSIZ; i++) { 1323 if (nexpire[i] == 0) 1324 continue; 1325 nptr = &mfctable[i]; 1326 for (mb_rt = *nptr; mb_rt != NULL; mb_rt = *nptr) { 1327 mfc = mtod(mb_rt, struct mfc *); 1328 1329 /* 1330 * Skip real cache entries 1331 * Make sure it wasn't marked to not expire (shouldn't happen) 1332 * If it expires now 1333 */ 1334 if (mb_rt->m_act != NULL && 1335 mfc->mfc_expire != 0 && 1336 --mfc->mfc_expire == 0) { 1337 if (mrtdebug & DEBUG_EXPIRE) 1338 log(LOG_DEBUG, "expire_upcalls: expiring (%x %x)\n", 1339 ntohl(mfc->mfc_origin.s_addr), 1340 ntohl(mfc->mfc_mcastgrp.s_addr)); 1341 /* 1342 * drop all the packets 1343 * free the mbuf with the pkt, if, timing info 1344 */ 1345 while (mb_rt->m_act) { 1346 m = mb_rt->m_act; 1347 mb_rt->m_act = m->m_act; 1348 1349 rte = mtod(m, struct rtdetq *); 1350 m_freem(rte->m); 1351 m_free(m); 1352 } 1353 ++mrtstat.mrts_cache_cleanups; 1354 nexpire[i]--; 1355 1356 MFREE(mb_rt, *nptr); 1357 } else { 1358 nptr = &mb_rt->m_next; 1359 } 1360 } 1361 } 1362 splx(s); 1363 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT); 1364 } 1365 1366 /* 1367 * Packet forwarding routine once entry in the cache is made 1368 */ 1369 static int 1370 ip_mdq(m, ifp, rt, xmt_vif) 1371 register struct mbuf *m; 1372 register struct ifnet *ifp; 1373 register struct mfc *rt; 1374 register vifi_t xmt_vif; 1375 { 1376 register struct ip *ip = mtod(m, struct ip *); 1377 register vifi_t vifi; 1378 register struct vif *vifp; 1379 register struct mbuf *tmp; 1380 register int plen = ntohs(ip->ip_len); 1381 1382 /* 1383 * Macro to send packet on vif. Since RSVP packets don't get counted on 1384 * input, they shouldn't get counted on output, so statistics keeping is 1385 * seperate. 1386 */ 1387 #define MC_SEND(ip,vifp,m) { \ 1388 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1389 encap_send((ip), (vifp), (m)); \ 1390 else \ 1391 phyint_send((ip), (vifp), (m)); \ 1392 } 1393 1394 /* 1395 * If xmt_vif is not -1, send on only the requested vif. 1396 * 1397 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1398 */ 1399 if (xmt_vif < numvifs) { 1400 MC_SEND(ip, viftable + xmt_vif, m); 1401 return 1; 1402 } 1403 1404 /* 1405 * Don't forward if it didn't arrive from the parent vif for its origin. 1406 */ 1407 vifi = rt->mfc_parent; 1408 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1409 /* came in the wrong interface */ 1410 if (mrtdebug & DEBUG_FORWARD) 1411 log(LOG_DEBUG, "wrong if: ifp %x vifi %d vififp %x\n", 1412 ifp, vifi, viftable[vifi].v_ifp); 1413 ++mrtstat.mrts_wrong_if; 1414 ++rt->mfc_wrong_if; 1415 /* 1416 * If we are doing PIM assert processing, and we are forwarding 1417 * packets on this interface, and it is a broadcast medium 1418 * interface (and not a tunnel), send a message to the routing daemon. 1419 */ 1420 if (pim_assert && rt->mfc_ttls[vifi] && 1421 (ifp->if_flags & IFF_BROADCAST) && 1422 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 1423 struct sockaddr_in k_igmpsrc; 1424 struct mbuf *mm; 1425 struct igmpmsg *im; 1426 int hlen = ip->ip_hl << 2; 1427 struct timeval now; 1428 register u_long delta; 1429 1430 GET_TIME(now); 1431 1432 TV_DELTA(rt->mfc_last_assert, now, delta); 1433 1434 if (delta > ASSERT_MSG_TIME) { 1435 mm = m_copy(m, 0, hlen); 1436 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1437 mm = m_pullup(mm, hlen); 1438 if (mm == NULL) { 1439 return ENOBUFS; 1440 } 1441 1442 rt->mfc_last_assert = now; 1443 1444 im = mtod(mm, struct igmpmsg *); 1445 im->im_msgtype = IGMPMSG_WRONGVIF; 1446 im->im_mbz = 0; 1447 im->im_vif = vifi; 1448 1449 k_igmpsrc.sin_addr = im->im_src; 1450 1451 socket_send(ip_mrouter, mm, &k_igmpsrc); 1452 } 1453 } 1454 return 0; 1455 } 1456 1457 /* If I sourced this packet, it counts as output, else it was input. */ 1458 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) { 1459 viftable[vifi].v_pkt_out++; 1460 viftable[vifi].v_bytes_out += plen; 1461 } else { 1462 viftable[vifi].v_pkt_in++; 1463 viftable[vifi].v_bytes_in += plen; 1464 } 1465 rt->mfc_pkt_cnt++; 1466 rt->mfc_byte_cnt += plen; 1467 1468 /* 1469 * For each vif, decide if a copy of the packet should be forwarded. 1470 * Forward if: 1471 * - the ttl exceeds the vif's threshold 1472 * - there are group members downstream on interface 1473 */ 1474 for (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++) 1475 if ((rt->mfc_ttls[vifi] > 0) && 1476 (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1477 vifp->v_pkt_out++; 1478 vifp->v_bytes_out += plen; 1479 MC_SEND(ip, vifp, m); 1480 } 1481 1482 return 0; 1483 } 1484 1485 /* 1486 * check if a vif number is legal/ok. This is used by ip_output, to export 1487 * numvifs there, 1488 */ 1489 int 1490 X_legal_vif_num(vif) 1491 int vif; 1492 { 1493 if (vif >= 0 && vif < numvifs) 1494 return(1); 1495 else 1496 return(0); 1497 } 1498 1499 #ifndef MROUTE_LKM 1500 int (*legal_vif_num)(int) = X_legal_vif_num; 1501 #endif 1502 1503 /* 1504 * Return the local address used by this vif 1505 */ 1506 u_long 1507 X_ip_mcast_src(vifi) 1508 int vifi; 1509 { 1510 if (vifi >= 0 && vifi < numvifs) 1511 return viftable[vifi].v_lcl_addr.s_addr; 1512 else 1513 return INADDR_ANY; 1514 } 1515 1516 #ifndef MROUTE_LKM 1517 u_long (*ip_mcast_src)(int) = X_ip_mcast_src; 1518 #endif 1519 1520 static void 1521 phyint_send(ip, vifp, m) 1522 struct ip *ip; 1523 struct vif *vifp; 1524 struct mbuf *m; 1525 { 1526 register struct mbuf *mb_copy; 1527 register int hlen = ip->ip_hl << 2; 1528 1529 /* 1530 * Make a new reference to the packet; make sure that 1531 * the IP header is actually copied, not just referenced, 1532 * so that ip_output() only scribbles on the copy. 1533 */ 1534 mb_copy = m_copy(m, 0, M_COPYALL); 1535 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1536 mb_copy = m_pullup(mb_copy, hlen); 1537 if (mb_copy == NULL) 1538 return; 1539 1540 if (vifp->v_rate_limit <= 0) 1541 tbf_send_packet(vifp, mb_copy); 1542 else 1543 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len); 1544 } 1545 1546 static void 1547 encap_send(ip, vifp, m) 1548 register struct ip *ip; 1549 register struct vif *vifp; 1550 register struct mbuf *m; 1551 { 1552 register struct mbuf *mb_copy; 1553 register struct ip *ip_copy; 1554 int hlen = ip->ip_hl << 2; 1555 register int i, len = ip->ip_len; 1556 1557 /* 1558 * copy the old packet & pullup it's IP header into the 1559 * new mbuf so we can modify it. Try to fill the new 1560 * mbuf since if we don't the ethernet driver will. 1561 */ 1562 MGET(mb_copy, M_DONTWAIT, MT_DATA); 1563 if (mb_copy == NULL) 1564 return; 1565 mb_copy->m_data += 16; 1566 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1567 1568 if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1569 m_freem(mb_copy); 1570 return; 1571 } 1572 i = MHLEN - M_LEADINGSPACE(mb_copy); 1573 if (i > len) 1574 i = len; 1575 mb_copy = m_pullup(mb_copy, i); 1576 if (mb_copy == NULL) 1577 return; 1578 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr); 1579 1580 /* 1581 * fill in the encapsulating IP header. 1582 */ 1583 ip_copy = mtod(mb_copy, struct ip *); 1584 *ip_copy = multicast_encap_iphdr; 1585 ip_copy->ip_id = htons(ip_id++); 1586 ip_copy->ip_len += len; 1587 ip_copy->ip_src = vifp->v_lcl_addr; 1588 ip_copy->ip_dst = vifp->v_rmt_addr; 1589 1590 /* 1591 * turn the encapsulated IP header back into a valid one. 1592 */ 1593 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1594 --ip->ip_ttl; 1595 HTONS(ip->ip_len); 1596 HTONS(ip->ip_off); 1597 ip->ip_sum = 0; 1598 #if defined(LBL) && !defined(ultrix) 1599 ip->ip_sum = ~oc_cksum((caddr_t)ip, ip->ip_hl << 2, 0); 1600 #else 1601 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1602 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1603 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1604 #endif 1605 1606 if (vifp->v_rate_limit <= 0) 1607 tbf_send_packet(vifp, mb_copy); 1608 else 1609 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len); 1610 } 1611 1612 /* 1613 * De-encapsulate a packet and feed it back through ip input (this 1614 * routine is called whenever IP gets a packet with proto type 1615 * ENCAP_PROTO and a local destination address). 1616 */ 1617 void 1618 #ifdef MROUTE_LKM 1619 X_ipip_input(m) 1620 #else 1621 ipip_input(m, iphlen) 1622 #endif 1623 register struct mbuf *m; 1624 int iphlen; 1625 { 1626 struct ifnet *ifp = m->m_pkthdr.rcvif; 1627 register struct ip *ip = mtod(m, struct ip *); 1628 register int hlen = ip->ip_hl << 2; 1629 register int s; 1630 register struct ifqueue *ifq; 1631 register struct vif *vifp; 1632 1633 if (!have_encap_tunnel) { 1634 rip_input(m); 1635 return; 1636 } 1637 /* 1638 * dump the packet if it's not to a multicast destination or if 1639 * we don't have an encapsulating tunnel with the source. 1640 * Note: This code assumes that the remote site IP address 1641 * uniquely identifies the tunnel (i.e., that this site has 1642 * at most one tunnel with the remote site). 1643 */ 1644 if (! IN_MULTICAST(ntohl(((struct ip *)((char *)ip + hlen))->ip_dst.s_addr))) { 1645 ++mrtstat.mrts_bad_tunnel; 1646 m_freem(m); 1647 return; 1648 } 1649 if (ip->ip_src.s_addr != last_encap_src) { 1650 register struct vif *vife; 1651 1652 vifp = viftable; 1653 vife = vifp + numvifs; 1654 last_encap_src = ip->ip_src.s_addr; 1655 last_encap_vif = 0; 1656 for ( ; vifp < vife; ++vifp) 1657 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) { 1658 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) 1659 == VIFF_TUNNEL) 1660 last_encap_vif = vifp; 1661 break; 1662 } 1663 } 1664 if ((vifp = last_encap_vif) == 0) { 1665 last_encap_src = 0; 1666 mrtstat.mrts_cant_tunnel++; /*XXX*/ 1667 m_freem(m); 1668 if (mrtdebug) 1669 log(LOG_DEBUG, "ip_mforward: no tunnel with %x\n", 1670 ntohl(ip->ip_src.s_addr)); 1671 return; 1672 } 1673 ifp = vifp->v_ifp; 1674 1675 if (hlen > IP_HDR_LEN) 1676 ip_stripoptions(m, (struct mbuf *) 0); 1677 m->m_data += IP_HDR_LEN; 1678 m->m_len -= IP_HDR_LEN; 1679 m->m_pkthdr.len -= IP_HDR_LEN; 1680 m->m_pkthdr.rcvif = ifp; 1681 1682 ifq = &ipintrq; 1683 s = splimp(); 1684 if (IF_QFULL(ifq)) { 1685 IF_DROP(ifq); 1686 m_freem(m); 1687 } else { 1688 IF_ENQUEUE(ifq, m); 1689 /* 1690 * normally we would need a "schednetisr(NETISR_IP)" 1691 * here but we were called by ip_input and it is going 1692 * to loop back & try to dequeue the packet we just 1693 * queued as soon as we return so we avoid the 1694 * unnecessary software interrrupt. 1695 */ 1696 } 1697 splx(s); 1698 } 1699 1700 /* 1701 * Token bucket filter module 1702 */ 1703 1704 static void 1705 tbf_control(vifp, m, ip, p_len) 1706 register struct vif *vifp; 1707 register struct mbuf *m; 1708 register struct ip *ip; 1709 register u_long p_len; 1710 { 1711 register struct tbf *t = vifp->v_tbf; 1712 1713 if (p_len > MAX_BKT_SIZE) { 1714 /* drop if packet is too large */ 1715 mrtstat.mrts_pkt2large++; 1716 m_freem(m); 1717 return; 1718 } 1719 1720 tbf_update_tokens(vifp); 1721 1722 /* if there are enough tokens, 1723 * and the queue is empty, 1724 * send this packet out 1725 */ 1726 1727 if (t->tbf_q_len == 0) { 1728 /* queue empty, send packet if enough tokens */ 1729 if (p_len <= t->tbf_n_tok) { 1730 t->tbf_n_tok -= p_len; 1731 tbf_send_packet(vifp, m); 1732 } else { 1733 /* queue packet and timeout till later */ 1734 tbf_queue(vifp, m); 1735 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1736 } 1737 } else if (t->tbf_q_len < t->tbf_max_q_len) { 1738 /* finite queue length, so queue pkts and process queue */ 1739 tbf_queue(vifp, m); 1740 tbf_process_q(vifp); 1741 } else { 1742 /* queue length too much, try to dq and queue and process */ 1743 if (!tbf_dq_sel(vifp, ip)) { 1744 mrtstat.mrts_q_overflow++; 1745 m_freem(m); 1746 return; 1747 } else { 1748 tbf_queue(vifp, m); 1749 tbf_process_q(vifp); 1750 } 1751 } 1752 return; 1753 } 1754 1755 /* 1756 * adds a packet to the queue at the interface 1757 */ 1758 static void 1759 tbf_queue(vifp, m) 1760 register struct vif *vifp; 1761 register struct mbuf *m; 1762 { 1763 register int s = splnet(); 1764 register struct tbf *t = vifp->v_tbf; 1765 1766 if (t->tbf_t == NULL) { 1767 /* Queue was empty */ 1768 t->tbf_q = m; 1769 } else { 1770 /* Insert at tail */ 1771 t->tbf_t->m_act = m; 1772 } 1773 1774 /* Set new tail pointer */ 1775 t->tbf_t = m; 1776 1777 #ifdef DIAGNOSTIC 1778 /* Make sure we didn't get fed a bogus mbuf */ 1779 if (m->m_act) 1780 panic("tbf_queue: m_act"); 1781 #endif 1782 m->m_act = NULL; 1783 1784 t->tbf_q_len++; 1785 1786 splx(s); 1787 } 1788 1789 1790 /* 1791 * processes the queue at the interface 1792 */ 1793 static void 1794 tbf_process_q(vifp) 1795 register struct vif *vifp; 1796 { 1797 register struct mbuf *m; 1798 register int len; 1799 register int s = splnet(); 1800 register struct tbf *t = vifp->v_tbf; 1801 1802 /* loop through the queue at the interface and send as many packets 1803 * as possible 1804 */ 1805 while (t->tbf_q_len > 0) { 1806 m = t->tbf_q; 1807 1808 len = mtod(m, struct ip *)->ip_len; 1809 1810 /* determine if the packet can be sent */ 1811 if (len <= t->tbf_n_tok) { 1812 /* if so, 1813 * reduce no of tokens, dequeue the packet, 1814 * send the packet. 1815 */ 1816 t->tbf_n_tok -= len; 1817 1818 t->tbf_q = m->m_act; 1819 if (--t->tbf_q_len == 0) 1820 t->tbf_t = NULL; 1821 1822 m->m_act = NULL; 1823 tbf_send_packet(vifp, m); 1824 1825 } else break; 1826 } 1827 splx(s); 1828 } 1829 1830 static void 1831 tbf_reprocess_q(xvifp) 1832 void *xvifp; 1833 { 1834 register struct vif *vifp = xvifp; 1835 if (ip_mrouter == NULL) 1836 return; 1837 1838 tbf_update_tokens(vifp); 1839 1840 tbf_process_q(vifp); 1841 1842 if (vifp->v_tbf->tbf_q_len) 1843 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1844 } 1845 1846 /* function that will selectively discard a member of the queue 1847 * based on the precedence value and the priority 1848 */ 1849 static int 1850 tbf_dq_sel(vifp, ip) 1851 register struct vif *vifp; 1852 register struct ip *ip; 1853 { 1854 register int i; 1855 register int s = splnet(); 1856 register u_int p; 1857 register struct mbuf *m, *last; 1858 register struct mbuf **np; 1859 register struct tbf *t = vifp->v_tbf; 1860 1861 p = priority(vifp, ip); 1862 1863 np = &t->tbf_q; 1864 last = NULL; 1865 while ((m = *np) != NULL) { 1866 if (p > priority(vifp, mtod(m, struct ip *))) { 1867 *np = m->m_act; 1868 /* If we're removing the last packet, fix the tail pointer */ 1869 if (m == t->tbf_t) 1870 t->tbf_t = last; 1871 m_freem(m); 1872 /* it's impossible for the queue to be empty, but 1873 * we check anyway. */ 1874 if (--t->tbf_q_len == 0) 1875 t->tbf_t = NULL; 1876 splx(s); 1877 mrtstat.mrts_drop_sel++; 1878 return(1); 1879 } 1880 np = &m->m_act; 1881 last = m; 1882 } 1883 splx(s); 1884 return(0); 1885 } 1886 1887 static void 1888 tbf_send_packet(vifp, m) 1889 register struct vif *vifp; 1890 register struct mbuf *m; 1891 { 1892 struct ip_moptions imo; 1893 int error; 1894 int s = splnet(); 1895 1896 if (vifp->v_flags & VIFF_TUNNEL) { 1897 /* If tunnel options */ 1898 ip_output(m, (struct mbuf *)0, (struct route *)0, 1899 IP_FORWARDING, (struct ip_moptions *)0); 1900 } else { 1901 imo.imo_multicast_ifp = vifp->v_ifp; 1902 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 1903 imo.imo_multicast_loop = 1; 1904 imo.imo_multicast_vif = -1; 1905 1906 error = ip_output(m, (struct mbuf *)0, (struct route *)0, 1907 IP_FORWARDING, &imo); 1908 1909 if (mrtdebug & DEBUG_XMIT) 1910 log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 1911 vifp - viftable, error); 1912 } 1913 splx(s); 1914 } 1915 1916 /* determine the current time and then 1917 * the elapsed time (between the last time and time now) 1918 * in milliseconds & update the no. of tokens in the bucket 1919 */ 1920 static void 1921 tbf_update_tokens(vifp) 1922 register struct vif *vifp; 1923 { 1924 struct timeval tp; 1925 register u_long tm; 1926 register int s = splnet(); 1927 register struct tbf *t = vifp->v_tbf; 1928 1929 GET_TIME(tp); 1930 1931 TV_DELTA(tp, t->tbf_last_pkt_t, tm); 1932 1933 /* 1934 * This formula is actually 1935 * "time in seconds" * "bytes/second". 1936 * 1937 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 1938 * 1939 * The (1000/1024) was introduced in add_vif to optimize 1940 * this divide into a shift. 1941 */ 1942 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8; 1943 t->tbf_last_pkt_t = tp; 1944 1945 if (t->tbf_n_tok > MAX_BKT_SIZE) 1946 t->tbf_n_tok = MAX_BKT_SIZE; 1947 1948 splx(s); 1949 } 1950 1951 static int 1952 priority(vifp, ip) 1953 register struct vif *vifp; 1954 register struct ip *ip; 1955 { 1956 register int prio; 1957 1958 /* temporary hack; may add general packet classifier some day */ 1959 1960 /* 1961 * The UDP port space is divided up into four priority ranges: 1962 * [0, 16384) : unclassified - lowest priority 1963 * [16384, 32768) : audio - highest priority 1964 * [32768, 49152) : whiteboard - medium priority 1965 * [49152, 65536) : video - low priority 1966 */ 1967 if (ip->ip_p == IPPROTO_UDP) { 1968 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 1969 switch (ntohs(udp->uh_dport) & 0xc000) { 1970 case 0x4000: 1971 prio = 70; 1972 break; 1973 case 0x8000: 1974 prio = 60; 1975 break; 1976 case 0xc000: 1977 prio = 55; 1978 break; 1979 default: 1980 prio = 50; 1981 break; 1982 } 1983 if (tbfdebug > 1) 1984 log(LOG_DEBUG, "port %x prio%d\n", ntohs(udp->uh_dport), prio); 1985 } else { 1986 prio = 50; 1987 } 1988 return prio; 1989 } 1990 1991 /* 1992 * End of token bucket filter modifications 1993 */ 1994 1995 int 1996 ip_rsvp_vif_init(so, m) 1997 struct socket *so; 1998 struct mbuf *m; 1999 { 2000 int i; 2001 register int s; 2002 2003 if (rsvpdebug) 2004 printf("ip_rsvp_vif_init: so_type = %d, pr_protocol = %d\n", 2005 so->so_type, so->so_proto->pr_protocol); 2006 2007 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2008 return EOPNOTSUPP; 2009 2010 /* Check mbuf. */ 2011 if (m == NULL || m->m_len != sizeof(int)) { 2012 return EINVAL; 2013 } 2014 i = *(mtod(m, int *)); 2015 2016 if (rsvpdebug) 2017 printf("ip_rsvp_vif_init: vif = %d rsvp_on = %d\n",i,rsvp_on); 2018 2019 s = splnet(); 2020 2021 /* Check vif. */ 2022 if (!legal_vif_num(i)) { 2023 splx(s); 2024 return EADDRNOTAVAIL; 2025 } 2026 2027 /* Check if socket is available. */ 2028 if (viftable[i].v_rsvpd != NULL) { 2029 splx(s); 2030 return EADDRINUSE; 2031 } 2032 2033 viftable[i].v_rsvpd = so; 2034 /* This may seem silly, but we need to be sure we don't over-increment 2035 * the RSVP counter, in case something slips up. 2036 */ 2037 if (!viftable[i].v_rsvp_on) { 2038 viftable[i].v_rsvp_on = 1; 2039 rsvp_on++; 2040 } 2041 2042 splx(s); 2043 return 0; 2044 } 2045 2046 int 2047 ip_rsvp_vif_done(so, m) 2048 struct socket *so; 2049 struct mbuf *m; 2050 { 2051 int i; 2052 register int s; 2053 2054 if (rsvpdebug) 2055 printf("ip_rsvp_vif_done: so_type = %d, pr_protocol = %d\n", 2056 so->so_type, so->so_proto->pr_protocol); 2057 2058 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2059 return EOPNOTSUPP; 2060 2061 /* Check mbuf. */ 2062 if (m == NULL || m->m_len != sizeof(int)) { 2063 return EINVAL; 2064 } 2065 i = *(mtod(m, int *)); 2066 2067 s = splnet(); 2068 2069 /* Check vif. */ 2070 if (!legal_vif_num(i)) { 2071 splx(s); 2072 return EADDRNOTAVAIL; 2073 } 2074 2075 if (rsvpdebug) 2076 printf("ip_rsvp_vif_done: v_rsvpd = %x so = %x\n", 2077 viftable[i].v_rsvpd, so); 2078 2079 viftable[i].v_rsvpd = NULL; 2080 /* This may seem silly, but we need to be sure we don't over-decrement 2081 * the RSVP counter, in case something slips up. 2082 */ 2083 if (viftable[i].v_rsvp_on) { 2084 viftable[i].v_rsvp_on = 0; 2085 rsvp_on--; 2086 } 2087 2088 splx(s); 2089 return 0; 2090 } 2091 2092 void 2093 ip_rsvp_force_done(so) 2094 struct socket *so; 2095 { 2096 int vifi; 2097 register int s; 2098 2099 /* Don't bother if it is not the right type of socket. */ 2100 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 2101 return; 2102 2103 s = splnet(); 2104 2105 /* The socket may be attached to more than one vif...this 2106 * is perfectly legal. 2107 */ 2108 for (vifi = 0; vifi < numvifs; vifi++) { 2109 if (viftable[vifi].v_rsvpd == so) { 2110 viftable[vifi].v_rsvpd = NULL; 2111 /* This may seem silly, but we need to be sure we don't 2112 * over-decrement the RSVP counter, in case something slips up. 2113 */ 2114 if (viftable[vifi].v_rsvp_on) { 2115 viftable[vifi].v_rsvp_on = 0; 2116 rsvp_on--; 2117 } 2118 } 2119 } 2120 2121 splx(s); 2122 return; 2123 } 2124 2125 void 2126 rsvp_input(m, iphlen) 2127 struct mbuf *m; 2128 int iphlen; 2129 { 2130 int vifi; 2131 register struct ip *ip = mtod(m, struct ip *); 2132 static struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET }; 2133 register int s; 2134 struct ifnet *ifp; 2135 2136 if (rsvpdebug) 2137 printf("rsvp_input: rsvp_on %d\n",rsvp_on); 2138 2139 /* Can still get packets with rsvp_on = 0 if there is a local member 2140 * of the group to which the RSVP packet is addressed. But in this 2141 * case we want to throw the packet away. 2142 */ 2143 if (!rsvp_on) { 2144 m_freem(m); 2145 return; 2146 } 2147 2148 /* If the old-style non-vif-associated socket is set, then use 2149 * it and ignore the new ones. 2150 */ 2151 if (ip_rsvpd != NULL) { 2152 if (rsvpdebug) 2153 printf("rsvp_input: Sending packet up old-style socket\n"); 2154 rip_input(m); 2155 return; 2156 } 2157 2158 s = splnet(); 2159 2160 if (rsvpdebug) 2161 printf("rsvp_input: check vifs\n"); 2162 2163 #ifdef DIAGNOSTIC 2164 if (!(m->m_flags & M_PKTHDR)) 2165 panic("rsvp_input no hdr"); 2166 #endif 2167 2168 ifp = m->m_pkthdr.rcvif; 2169 /* Find which vif the packet arrived on. */ 2170 for (vifi = 0; vifi < numvifs; vifi++) { 2171 if (viftable[vifi].v_ifp == ifp) 2172 break; 2173 } 2174 2175 if (vifi == numvifs) { 2176 /* Can't find vif packet arrived on. Drop packet. */ 2177 if (rsvpdebug) 2178 printf("rsvp_input: Can't find vif for packet...dropping it.\n"); 2179 m_freem(m); 2180 splx(s); 2181 return; 2182 } 2183 2184 if (rsvpdebug) 2185 printf("rsvp_input: check socket\n"); 2186 2187 if (viftable[vifi].v_rsvpd == NULL) { 2188 /* drop packet, since there is no specific socket for this 2189 * interface */ 2190 if (rsvpdebug) 2191 printf("rsvp_input: No socket defined for vif %d\n",vifi); 2192 m_freem(m); 2193 splx(s); 2194 return; 2195 } 2196 rsvp_src.sin_addr = ip->ip_src; 2197 2198 if (rsvpdebug && m) 2199 printf("rsvp_input: m->m_len = %d, sbspace() = %d\n", 2200 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv))); 2201 2202 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) 2203 if (rsvpdebug) 2204 printf("rsvp_input: Failed to append to socket\n"); 2205 else 2206 if (rsvpdebug) 2207 printf("rsvp_input: send packet up\n"); 2208 2209 splx(s); 2210 } 2211 2212 #ifdef MROUTE_LKM 2213 #include <sys/conf.h> 2214 #include <sys/exec.h> 2215 #include <sys/sysent.h> 2216 #include <sys/lkm.h> 2217 2218 MOD_MISC("ip_mroute_mod") 2219 2220 static int 2221 ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd) 2222 { 2223 int i; 2224 struct lkm_misc *args = lkmtp->private.lkm_misc; 2225 int err = 0; 2226 2227 switch(cmd) { 2228 static int (*old_ip_mrouter_cmd)(); 2229 static int (*old_ip_mrouter_done)(); 2230 static int (*old_ip_mforward)(); 2231 static int (*old_mrt_ioctl)(); 2232 static void (*old_proto4_input)(); 2233 static int (*old_legal_vif_num)(); 2234 extern struct protosw inetsw[]; 2235 2236 case LKM_E_LOAD: 2237 if(lkmexists(lkmtp) || ip_mrtproto) 2238 return(EEXIST); 2239 old_ip_mrouter_cmd = ip_mrouter_cmd; 2240 ip_mrouter_cmd = X_ip_mrouter_cmd; 2241 old_ip_mrouter_done = ip_mrouter_done; 2242 ip_mrouter_done = X_ip_mrouter_done; 2243 old_ip_mforward = ip_mforward; 2244 ip_mforward = X_ip_mforward; 2245 old_mrt_ioctl = mrt_ioctl; 2246 mrt_ioctl = X_mrt_ioctl; 2247 old_proto4_input = inetsw[ip_protox[ENCAP_PROTO]].pr_input; 2248 inetsw[ip_protox[ENCAP_PROTO]].pr_input = X_ipip_input; 2249 old_legal_vif_num = legal_vif_num; 2250 legal_vif_num = X_legal_vif_num; 2251 ip_mrtproto = IGMP_DVMRP; 2252 2253 printf("\nIP multicast routing loaded\n"); 2254 break; 2255 2256 case LKM_E_UNLOAD: 2257 if (ip_mrouter) 2258 return EINVAL; 2259 2260 ip_mrouter_cmd = old_ip_mrouter_cmd; 2261 ip_mrouter_done = old_ip_mrouter_done; 2262 ip_mforward = old_ip_mforward; 2263 mrt_ioctl = old_mrt_ioctl; 2264 inetsw[ip_protox[ENCAP_PROTO]].pr_input = old_proto4_input; 2265 legal_vif_num = old_legal_vif_num; 2266 ip_mrtproto = 0; 2267 break; 2268 2269 default: 2270 err = EINVAL; 2271 break; 2272 } 2273 2274 return(err); 2275 } 2276 2277 int 2278 ip_mroute_mod(struct lkm_table *lkmtp, int cmd, int ver) { 2279 DISPATCH(lkmtp, cmd, ver, ip_mroute_mod_handle, ip_mroute_mod_handle, 2280 nosys); 2281 } 2282 2283 #endif /* MROUTE_LKM */ 2284 #endif /* MROUTING */ 2285