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