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