ip_mroute.c revision 113255
180708Sjake/* 280708Sjake * IP multicast forwarding procedures 385586Sjake * 485586Sjake * Written by David Waitzman, BBN Labs, August 1988. 580708Sjake * Modified by Steve Deering, Stanford, February 1989. 680708Sjake * Modified by Mark J. Steiglitz, Stanford, May, 1991 785586Sjake * Modified by Van Jacobson, LBL, January 1993 885586Sjake * Modified by Ajit Thyagarajan, PARC, August 1993 985586Sjake * Modified by Bill Fenner, PARC, April 1995 1080708Sjake * 1180708Sjake * MROUTING Revision: 3.5 1280708Sjake * $FreeBSD: head/sys/netinet/ip_mroute.c 113255 2003-04-08 14:25:47Z des $ 1380708Sjake */ 1480708Sjake 1580708Sjake#include "opt_mac.h" 1680708Sjake#include "opt_mrouting.h" 1780708Sjake#include "opt_random_ip_id.h" 1880708Sjake 1985586Sjake#include <sys/param.h> 2085586Sjake#include <sys/kernel.h> 2185586Sjake#include <sys/lock.h> 2285586Sjake#include <sys/mac.h> 2385586Sjake#include <sys/malloc.h> 2485586Sjake#include <sys/mbuf.h> 2585586Sjake#include <sys/protosw.h> 2685586Sjake#include <sys/signalvar.h> 2785586Sjake#include <sys/socket.h> 2885586Sjake#include <sys/socketvar.h> 2985586Sjake#include <sys/sockio.h> 3080708Sjake#include <sys/sx.h> 31219532Smarius#include <sys/sysctl.h> 3280708Sjake#include <sys/syslog.h> 3380708Sjake#include <sys/systm.h> 34172708Smarius#include <sys/time.h> 35172708Smarius#include <net/if.h> 36172708Smarius#include <net/netisr.h> 3780708Sjake#include <net/route.h> 38100384Speter#include <netinet/in.h> 3980708Sjake#include <netinet/igmp.h> 40102808Sjake#include <netinet/in_systm.h> 41102808Sjake#include <netinet/in_var.h> 4280708Sjake#include <netinet/ip.h> 43208453Skib#include <netinet/ip_encap.h> 44100384Speter#include <netinet/ip_mroute.h> 45100384Speter#include <netinet/ip_var.h> 46100384Speter#include <netinet/udp.h> 47100384Speter#include <machine/in_cksum.h> 48100384Speter 49102808Sjake/* 50102808Sjake * Control debugging code for rsvp and multicast routing code. 51102808Sjake * Can only set them with the debugger. 52102808Sjake */ 5380708Sjakestatic u_int rsvpdebug; /* non-zero enables debugging */ 5480708Sjake 5585586Sjakestatic u_int mrtdebug; /* any set of the flags below */ 5685586Sjake#define DEBUG_MFC 0x02 57172708Smarius#define DEBUG_FORWARD 0x04 58183322Skib#define DEBUG_EXPIRE 0x08 59183322Skib#define DEBUG_XMIT 0x10 60183322Skib 61183322Skib#define M_HASCL(m) ((m)->m_flags & M_EXT) 62183322Skib 63183322Skibstatic MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast routing tables"); 64183322Skib 65183322Skibstatic struct mrtstat mrtstat; 66183322SkibSYSCTL_STRUCT(_net_inet_ip, OID_AUTO, mrtstat, CTLFLAG_RW, 67183322Skib &mrtstat, mrtstat, 68183322Skib "Multicast Routing Statistics (struct mrtstat, netinet/ip_mroute.h)"); 69183322Skib 70183322Skibstatic struct mfc *mfctable[MFCTBLSIZ]; 71183322Skibstatic u_char nexpire[MFCTBLSIZ]; 72183322Skibstatic struct vif viftable[MAXVIFS]; 73183322Skib 74183322Skibstatic struct callout_handle expire_upcalls_ch; 75183322Skib 76183322Skib#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 77183322Skib#define UPCALL_EXPIRE 6 /* number of timeouts */ 78183322Skib 79183322Skib/* 80183322Skib * Define the token bucket filter structures 81183322Skib * tbftable -> each vif has one of these for storing info 82183322Skib */ 83183322Skib 84185169Skibstatic struct tbf tbftable[MAXVIFS]; 85208453Skib#define TBF_REPROCESS (hz / 100) /* 100x / second */ 86208453Skib 87208453Skib/* 88208453Skib * 'Interfaces' associated with decapsulator (so we can tell 89219405Sdchagin * packets that went through it from ones that get reflected 90293490Sdchagin * by a broken gateway). These interfaces are never linked into 91294136Sdchagin * the system ifnet list & no routes point to them. I.e., packets 92100384Speter * can't be sent this way. They only exist as a placeholder for 93100384Speter * multicast source verification. 94100384Speter */ 95183322Skibstatic struct ifnet multicast_decap_if[MAXVIFS]; 96183322Skib 97183322Skib#define ENCAP_TTL 64 98183322Skib#define ENCAP_PROTO IPPROTO_IPIP /* 4 */ 99183322Skib 100183322Skib/* prototype IP hdr for encapsulated packets */ 101183322Skibstatic struct ip multicast_encap_iphdr = { 102189771Sdchagin#if BYTE_ORDER == LITTLE_ENDIAN 103190708Sdchagin sizeof(struct ip) >> 2, IPVERSION, 104183322Skib#else 105100384Speter IPVERSION, sizeof(struct ip) >> 2, 106197729Sbz#endif 107219533Smarius 0, /* tos */ 108100384Speter sizeof(struct ip), /* total length */ 109123742Speter 0, /* id */ 110183322Skib 0, /* frag offset */ 111183322Skib ENCAP_TTL, ENCAP_PROTO, 112183322Skib 0, /* checksum */ 113183322Skib}; 114183322Skib 115183322Skib/* 116183322Skib * Private variables. 117189771Sdchagin */ 118190708Sdchaginstatic vifi_t numvifs; 119183322Skibstatic const struct encaptab *encap_cookie; 120123742Speter 121123742Speter/* 122219533Smarius * one-back cache used by mroute_encapcheck to locate a tunnel's vif 123123742Speter * given a datagram's src ip address. 124133464Smarcel */ 125133464Smarcelstatic u_long last_encap_src; 126133464Smarcelstatic struct vif *last_encap_vif; 127133464Smarcel 128213104Smariusstatic u_long X_ip_mcast_src(int vifi); 129133464Smarcelstatic int X_ip_mforward(struct ip *ip, struct ifnet *ifp, 130133464Smarcel struct mbuf *m, struct ip_moptions *imo); 13185586Sjakestatic int X_ip_mrouter_done(void); 13285586Sjakestatic int X_ip_mrouter_get(struct socket *so, struct sockopt *m); 13385586Sjakestatic int X_ip_mrouter_set(struct socket *so, struct sockopt *m); 13485586Sjakestatic int X_legal_vif_num(int vif); 13585586Sjakestatic int X_mrt_ioctl(int cmd, caddr_t data); 13685586Sjake 13785586Sjakestatic int get_sg_cnt(struct sioc_sg_req *); 13885586Sjakestatic int get_vif_cnt(struct sioc_vif_req *); 13985586Sjakestatic int ip_mrouter_init(struct socket *, int); 14085586Sjakestatic int add_vif(struct vifctl *); 14185586Sjakestatic int del_vif(vifi_t); 14285586Sjakestatic int add_mfc(struct mfcctl *); 14385586Sjakestatic int del_mfc(struct mfcctl *); 14485586Sjakestatic int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *); 145219532Smariusstatic int set_assert(int); 146219532Smariusstatic void expire_upcalls(void *); 147219532Smariusstatic int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t); 148219532Smariusstatic void phyint_send(struct ip *, struct vif *, struct mbuf *); 149219532Smariusstatic void encap_send(struct ip *, struct vif *, struct mbuf *); 150219532Smariusstatic void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long); 151212998Skibstatic void tbf_queue(struct vif *, struct mbuf *); 152219533Smariusstatic void tbf_process_q(struct vif *); 153219533Smariusstatic void tbf_reprocess_q(void *); 154219533Smariusstatic int tbf_dq_sel(struct vif *, struct ip *); 155219532Smariusstatic void tbf_send_packet(struct vif *, struct mbuf *); 156219532Smariusstatic void tbf_update_tokens(struct vif *); 157172708Smariusstatic int priority(struct vif *, struct ip *); 15885586Sjake 159219532Smarius/* 160219532Smarius * whether or not special PIM assert processing is enabled. 161219532Smarius */ 16285586Sjakestatic int pim_assert; 16385586Sjake/* 16485586Sjake * Rate limit for assert notification messages, in usec 16585586Sjake */ 16685586Sjake#define ASSERT_MSG_TIME 3000000 167212998Skib 168212998Skib/* 169212998Skib * Hash function for a source, group entry 170212998Skib */ 17185586Sjake#define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \ 17285586Sjake ((g) >> 20) ^ ((g) >> 10) ^ (g)) 17385586Sjake 17485586Sjake/* 17585586Sjake * Find a route for a given origin IP address and Multicast group address 17685586Sjake * Type of service parameter to be added in the future!!! 17785586Sjake * Statistics are updated by the caller if needed 17885586Sjake * (mrtstat.mrts_mfc_lookups and mrtstat.mrts_mfc_misses) 17985586Sjake */ 180104072Sjakestatic struct mfc * 181104072Sjakemfc_find(in_addr_t o, in_addr_t g) 18285586Sjake{ 18385586Sjake struct mfc *rt; 18485586Sjake 18585586Sjake for (rt = mfctable[MFCHASH(o,g)]; rt; rt = rt->mfc_next) 18685586Sjake if ((rt->mfc_origin.s_addr == o) && 18785586Sjake (rt->mfc_mcastgrp.s_addr == g) && (rt->mfc_stall == NULL)) 18885586Sjake break; 189212998Skib return rt; 190212998Skib} 191212998Skib 19285586Sjake/* 193212998Skib * Macros to compute elapsed time efficiently 194212998Skib * Borrowed from Van Jacobson's scheduling code 195212998Skib */ 19685586Sjake#define TV_DELTA(a, b, delta) { \ 19785586Sjake int xxs; \ 19885586Sjake delta = (a).tv_usec - (b).tv_usec; \ 19985586Sjake if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 20085586Sjake switch (xxs) { \ 20185586Sjake case 2: \ 202212998Skib delta += 1000000; \ 203212998Skib /* FALLTHROUGH */ \ 204212998Skib case 1: \ 20585586Sjake delta += 1000000; \ 20685586Sjake break; \ 207212998Skib default: \ 208212998Skib delta += (1000000 * xxs); \ 209212998Skib } \ 210212998Skib } \ 211212998Skib} 21285586Sjake 21385586Sjake#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 21485586Sjake (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 215219533Smarius 216219533Smarius/* 217219533Smarius * Handle MRT setsockopt commands to modify the multicast routing tables. 218219533Smarius */ 219219533Smariusstatic int 220219533SmariusX_ip_mrouter_set(struct socket *so, struct sockopt *sopt) 221219533Smarius{ 222219533Smarius int error, optval; 223219533Smarius vifi_t vifi; 224219533Smarius struct vifctl vifc; 225219533Smarius struct mfcctl mfc; 226219533Smarius 227219533Smarius if (so != ip_mrouter && sopt->sopt_name != MRT_INIT) 228219533Smarius return EPERM; 229219533Smarius 230219533Smarius error = 0; 231219533Smarius switch (sopt->sopt_name) { 232219533Smarius case MRT_INIT: 233219533Smarius error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 234219533Smarius if (error) 235219533Smarius break; 236219533Smarius error = ip_mrouter_init(so, optval); 237219533Smarius break; 238219533Smarius 239219533Smarius case MRT_DONE: 240219533Smarius error = ip_mrouter_done(); 241219533Smarius break; 242219533Smarius 24385586Sjake case MRT_ADD_VIF: 24485586Sjake error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc); 245104072Sjake if (error) 246213104Smarius break; 247219532Smarius error = add_vif(&vifc); 248219532Smarius break; 249219532Smarius 250219532Smarius case MRT_DEL_VIF: 251219532Smarius error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi); 252219532Smarius if (error) 253219532Smarius break; 254219533Smarius error = del_vif(vifi); 255219533Smarius break; 256219533Smarius 257219533Smarius case MRT_ADD_MFC: 258219533Smarius case MRT_DEL_MFC: 259104072Sjake error = sooptcopyin(sopt, &mfc, sizeof mfc, sizeof mfc); 260104072Sjake if (error) 261104072Sjake break; 262219532Smarius if (sopt->sopt_name == MRT_ADD_MFC) 263219532Smarius error = add_mfc(&mfc); 264219532Smarius else 265219532Smarius error = del_mfc(&mfc); 266219532Smarius break; 267212998Skib 268219533Smarius case MRT_ASSERT: 269219533Smarius error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 270219533Smarius if (error) 271219532Smarius break; 272219532Smarius set_assert(optval); 27385586Sjake break; 274172708Smarius 275219532Smarius default: 27685586Sjake error = EOPNOTSUPP; 277219532Smarius break; 27885586Sjake } 27985586Sjake return error; 280219532Smarius} 281219532Smarius 28285586Sjake/* 283219339Smarius * Handle MRT getsockopt commands 284219339Smarius */ 285219339Smariusstatic int 286219339SmariusX_ip_mrouter_get(struct socket *so, struct sockopt *sopt) 287219339Smarius{ 288219532Smarius int error; 289219339Smarius static int version = 0x0305; /* !!! why is this here? XXX */ 290219339Smarius 291219339Smarius switch (sopt->sopt_name) { 292219339Smarius case MRT_VERSION: 293219339Smarius error = sooptcopyout(sopt, &version, sizeof version); 29485586Sjake break; 295219532Smarius 29685586Sjake case MRT_ASSERT: 29785586Sjake error = sooptcopyout(sopt, &pim_assert, sizeof pim_assert); 29885586Sjake break; 29985586Sjake 300219533Smarius default: 301219533Smarius error = EOPNOTSUPP; 302219533Smarius break; 303219533Smarius } 304219533Smarius return error; 305219533Smarius} 306219533Smarius 307219533Smarius/* 308219533Smarius * Handle ioctl commands to obtain information from the cache 309219533Smarius */ 310219533Smariusstatic int 311219533SmariusX_mrt_ioctl(int cmd, caddr_t data) 31285586Sjake{ 31385586Sjake int error = 0; 314219532Smarius 31585586Sjake switch (cmd) { 316109605Sjake case (SIOCGETVIFCNT): 317129282Speter error = get_vif_cnt((struct sioc_vif_req *)data); 318213104Smarius break; 319109605Sjake 320109605Sjake case (SIOCGETSGCNT): 321109605Sjake error = get_sg_cnt((struct sioc_sg_req *)data); 322109605Sjake break; 323109605Sjake 324109605Sjake default: 325109605Sjake error = EINVAL; 326109605Sjake break; 327172708Smarius } 328109605Sjake return error; 329109605Sjake} 330213104Smarius 331213104Smarius/* 332109605Sjake * returns the packet, byte, rpf-failure count for the source group provided 333109605Sjake */ 334109605Sjakestatic int 335109605Sjakeget_sg_cnt(struct sioc_sg_req *req) 33685586Sjake{ 33780708Sjake int s; 338129282Speter struct mfc *rt; 339129282Speter 34080708Sjake s = splnet(); 34185586Sjake rt = mfc_find(req->src.s_addr, req->grp.s_addr); 342153504Smarcel splx(s); 34385586Sjake if (rt == NULL) { 344153504Smarcel req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; 34585586Sjake return EADDRNOTAVAIL; 34685586Sjake } 34798635Smux req->pktcnt = rt->mfc_pkt_cnt; 348288287Skib req->bytecnt = rt->mfc_byte_cnt; 34985586Sjake req->wrong_if = rt->mfc_wrong_if; 35085586Sjake return 0; 35185586Sjake} 35285586Sjake 35385586Sjake/* 35485586Sjake * returns the input and output packet and byte counts on the vif provided 355153504Smarcel */ 356172708Smariusstatic int 35795410Smarcelget_vif_cnt(struct sioc_vif_req *req) 35885586Sjake{ 359109605Sjake vifi_t vifi = req->vifi; 36085586Sjake 36185586Sjake if (vifi >= numvifs) 36285586Sjake return EINVAL; 363172708Smarius 364219533Smarius req->icount = viftable[vifi].v_pkt_in; 365219533Smarius req->ocount = viftable[vifi].v_pkt_out; 36685586Sjake req->ibytes = viftable[vifi].v_bytes_in; 367219533Smarius req->obytes = viftable[vifi].v_bytes_out; 36885586Sjake 369219533Smarius return 0; 370219533Smarius} 37185586Sjake 372219533Smarius/* 37385586Sjake * Enable multicast routing 37485586Sjake */ 37585586Sjakestatic int 37685586Sjakeip_mrouter_init(struct socket *so, int version) 377288287Skib{ 378288287Skib if (mrtdebug) 379107517Stmm log(LOG_DEBUG, "ip_mrouter_init: so_type = %d, pr_protocol = %d\n", 380219531Smarius so->so_type, so->so_proto->pr_protocol); 381212998Skib 382212998Skib if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP) 38385586Sjake return EOPNOTSUPP; 38485586Sjake 385172708Smarius if (version != 1) 386172708Smarius return ENOPROTOOPT; 387172708Smarius 388219340Smarius if (ip_mrouter != NULL) 389219340Smarius return EADDRINUSE; 390219340Smarius 39185586Sjake ip_mrouter = so; 39285586Sjake 39385586Sjake bzero((caddr_t)mfctable, sizeof(mfctable)); 394213104Smarius bzero((caddr_t)nexpire, sizeof(nexpire)); 395194784Sjeff 39685586Sjake pim_assert = 0; 39785586Sjake 39885586Sjake expire_upcalls_ch = timeout(expire_upcalls, NULL, EXPIRE_TIMEOUT); 39985586Sjake 40085586Sjake if (mrtdebug) 401219533Smarius log(LOG_DEBUG, "ip_mrouter_init\n"); 402219533Smarius 403219533Smarius return 0; 40485586Sjake} 40585586Sjake 40685586Sjake/* 40785586Sjake * Disable multicast routing 40885586Sjake */ 40985586Sjakestatic int 41085586SjakeX_ip_mrouter_done(void) 41185586Sjake{ 41280708Sjake vifi_t vifi; 41380708Sjake int i; 414105469Smarcel struct ifnet *ifp; 415105469Smarcel struct ifreq ifr; 416105469Smarcel struct mfc *rt; 417105469Smarcel struct rtdetq *rte; 418105469Smarcel int s; 419105469Smarcel 420105469Smarcel s = splnet(); 421105469Smarcel 422105469Smarcel /* 423105469Smarcel * For each phyint in use, disable promiscuous reception of all IP 424105469Smarcel * multicasts. 425105469Smarcel */ 426105469Smarcel for (vifi = 0; vifi < numvifs; vifi++) { 427105469Smarcel if (viftable[vifi].v_lcl_addr.s_addr != 0 && 428 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 429 struct sockaddr_in *so = (struct sockaddr_in *)&(ifr.ifr_addr); 430 431 so->sin_len = sizeof(struct sockaddr_in); 432 so->sin_family = AF_INET; 433 so->sin_addr.s_addr = INADDR_ANY; 434 ifp = viftable[vifi].v_ifp; 435 if_allmulti(ifp, 0); 436 } 437 } 438 bzero((caddr_t)tbftable, sizeof(tbftable)); 439 bzero((caddr_t)viftable, sizeof(viftable)); 440 numvifs = 0; 441 pim_assert = 0; 442 443 untimeout(expire_upcalls, NULL, expire_upcalls_ch); 444 445 /* 446 * Free all multicast forwarding cache entries. 447 */ 448 for (i = 0; i < MFCTBLSIZ; i++) { 449 for (rt = mfctable[i]; rt != NULL; ) { 450 struct mfc *nr = rt->mfc_next; 451 452 for (rte = rt->mfc_stall; rte != NULL; ) { 453 struct rtdetq *n = rte->next; 454 455 m_freem(rte->m); 456 free(rte, M_MRTABLE); 457 rte = n; 458 } 459 free(rt, M_MRTABLE); 460 rt = nr; 461 } 462 } 463 464 bzero((caddr_t)mfctable, sizeof(mfctable)); 465 466 /* 467 * Reset de-encapsulation cache 468 */ 469 last_encap_src = INADDR_ANY; 470 last_encap_vif = NULL; 471 if (encap_cookie) { 472 encap_detach(encap_cookie); 473 encap_cookie = NULL; 474 } 475 476 ip_mrouter = NULL; 477 478 splx(s); 479 480 if (mrtdebug) 481 log(LOG_DEBUG, "ip_mrouter_done\n"); 482 483 return 0; 484} 485 486/* 487 * Set PIM assert processing global 488 */ 489static int 490set_assert(int i) 491{ 492 if ((i != 1) && (i != 0)) 493 return EINVAL; 494 495 pim_assert = i; 496 497 return 0; 498} 499 500/* 501 * Decide if a packet is from a tunnelled peer. 502 * Return 0 if not, 64 if so. XXX yuck.. 64 ??? 503 */ 504static int 505mroute_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 506{ 507 struct ip *ip = mtod(m, struct ip *); 508 int hlen = ip->ip_hl << 2; 509 510 /* 511 * don't claim the packet if it's not to a multicast destination or if 512 * we don't have an encapsulating tunnel with the source. 513 * Note: This code assumes that the remote site IP address 514 * uniquely identifies the tunnel (i.e., that this site has 515 * at most one tunnel with the remote site). 516 */ 517 if (!IN_MULTICAST(ntohl(((struct ip *)((char *)ip+hlen))->ip_dst.s_addr))) 518 return 0; 519 if (ip->ip_src.s_addr != last_encap_src) { 520 struct vif *vifp = viftable; 521 struct vif *vife = vifp + numvifs; 522 523 last_encap_src = ip->ip_src.s_addr; 524 last_encap_vif = NULL; 525 for ( ; vifp < vife; ++vifp) 526 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) { 527 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT)) == VIFF_TUNNEL) 528 last_encap_vif = vifp; 529 break; 530 } 531 } 532 if (last_encap_vif == NULL) { 533 last_encap_src = INADDR_ANY; 534 return 0; 535 } 536 return 64; 537} 538 539/* 540 * De-encapsulate a packet and feed it back through ip input (this 541 * routine is called whenever IP gets a packet that mroute_encap_func() 542 * claimed). 543 */ 544static void 545mroute_encap_input(struct mbuf *m, int off) 546{ 547 struct ip *ip = mtod(m, struct ip *); 548 int hlen = ip->ip_hl << 2; 549 550 if (hlen > sizeof(struct ip)) 551 ip_stripoptions(m, (struct mbuf *) 0); 552 m->m_data += sizeof(struct ip); 553 m->m_len -= sizeof(struct ip); 554 m->m_pkthdr.len -= sizeof(struct ip); 555 556 m->m_pkthdr.rcvif = last_encap_vif->v_ifp; 557 558 netisr_queue(NETISR_IP, m); 559 /* 560 * normally we would need a "schednetisr(NETISR_IP)" 561 * here but we were called by ip_input and it is going 562 * to loop back & try to dequeue the packet we just 563 * queued as soon as we return so we avoid the 564 * unnecessary software interrrupt. 565 * 566 * XXX 567 * This no longer holds - we may have direct-dispatched the packet, 568 * or there may be a queue processing limit. 569 */ 570} 571 572extern struct domain inetdomain; 573static struct protosw mroute_encap_protosw = 574{ SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR, 575 mroute_encap_input, 0, 0, rip_ctloutput, 576 0, 577 0, 0, 0, 0, 578 &rip_usrreqs 579}; 580 581/* 582 * Add a vif to the vif table 583 */ 584static int 585add_vif(struct vifctl *vifcp) 586{ 587 struct vif *vifp = viftable + vifcp->vifc_vifi; 588 struct sockaddr_in sin = {sizeof sin, AF_INET}; 589 struct ifaddr *ifa; 590 struct ifnet *ifp; 591 int error, s; 592 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi; 593 594 if (vifcp->vifc_vifi >= MAXVIFS) 595 return EINVAL; 596 if (vifp->v_lcl_addr.s_addr != INADDR_ANY) 597 return EADDRINUSE; 598 if (vifcp->vifc_lcl_addr.s_addr == INADDR_ANY) 599 return EADDRNOTAVAIL; 600 601 /* Find the interface with an address in AF_INET family */ 602 sin.sin_addr = vifcp->vifc_lcl_addr; 603 ifa = ifa_ifwithaddr((struct sockaddr *)&sin); 604 if (ifa == NULL) 605 return EADDRNOTAVAIL; 606 ifp = ifa->ifa_ifp; 607 608 if (vifcp->vifc_flags & VIFF_TUNNEL) { 609 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) { 610 /* 611 * An encapsulating tunnel is wanted. Tell 612 * mroute_encap_input() to start paying attention 613 * to encapsulated packets. 614 */ 615 if (encap_cookie == NULL) { 616 encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV4, 617 mroute_encapcheck, 618 (struct protosw *)&mroute_encap_protosw, NULL); 619 620 if (encap_cookie == NULL) { 621 printf("ip_mroute: unable to attach encap\n"); 622 return EIO; /* XXX */ 623 } 624 for (s = 0; s < MAXVIFS; ++s) { 625 multicast_decap_if[s].if_name = "mdecap"; 626 multicast_decap_if[s].if_unit = s; 627 } 628 } 629 /* 630 * Set interface to fake encapsulator interface 631 */ 632 ifp = &multicast_decap_if[vifcp->vifc_vifi]; 633 /* 634 * Prepare cached route entry 635 */ 636 bzero(&vifp->v_route, sizeof(vifp->v_route)); 637 } else { 638 log(LOG_ERR, "source routed tunnels not supported\n"); 639 return EOPNOTSUPP; 640 } 641 } else { /* Make sure the interface supports multicast */ 642 if ((ifp->if_flags & IFF_MULTICAST) == 0) 643 return EOPNOTSUPP; 644 645 /* Enable promiscuous reception of all IP multicasts from the if */ 646 s = splnet(); 647 error = if_allmulti(ifp, 1); 648 splx(s); 649 if (error) 650 return error; 651 } 652 653 s = splnet(); 654 /* define parameters for the tbf structure */ 655 vifp->v_tbf = v_tbf; 656 GET_TIME(vifp->v_tbf->tbf_last_pkt_t); 657 vifp->v_tbf->tbf_n_tok = 0; 658 vifp->v_tbf->tbf_q_len = 0; 659 vifp->v_tbf->tbf_max_q_len = MAXQSIZE; 660 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL; 661 662 vifp->v_flags = vifcp->vifc_flags; 663 vifp->v_threshold = vifcp->vifc_threshold; 664 vifp->v_lcl_addr = vifcp->vifc_lcl_addr; 665 vifp->v_rmt_addr = vifcp->vifc_rmt_addr; 666 vifp->v_ifp = ifp; 667 /* scaling up here allows division by 1024 in critical code */ 668 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000; 669 vifp->v_rsvp_on = 0; 670 vifp->v_rsvpd = NULL; 671 /* initialize per vif pkt counters */ 672 vifp->v_pkt_in = 0; 673 vifp->v_pkt_out = 0; 674 vifp->v_bytes_in = 0; 675 vifp->v_bytes_out = 0; 676 splx(s); 677 678 /* Adjust numvifs up if the vifi is higher than numvifs */ 679 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1; 680 681 if (mrtdebug) 682 log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n", 683 vifcp->vifc_vifi, 684 (u_long)ntohl(vifcp->vifc_lcl_addr.s_addr), 685 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask", 686 (u_long)ntohl(vifcp->vifc_rmt_addr.s_addr), 687 vifcp->vifc_threshold, 688 vifcp->vifc_rate_limit); 689 690 return 0; 691} 692 693/* 694 * Delete a vif from the vif table 695 */ 696static int 697del_vif(vifi_t vifi) 698{ 699 struct vif *vifp; 700 int s; 701 702 if (vifi >= numvifs) 703 return EINVAL; 704 vifp = &viftable[vifi]; 705 if (vifp->v_lcl_addr.s_addr == INADDR_ANY) 706 return EADDRNOTAVAIL; 707 708 s = splnet(); 709 710 if (!(vifp->v_flags & VIFF_TUNNEL)) 711 if_allmulti(vifp->v_ifp, 0); 712 713 if (vifp == last_encap_vif) { 714 last_encap_vif = NULL; 715 last_encap_src = INADDR_ANY; 716 } 717 718 /* 719 * Free packets queued at the interface 720 */ 721 while (vifp->v_tbf->tbf_q) { 722 struct mbuf *m = vifp->v_tbf->tbf_q; 723 724 vifp->v_tbf->tbf_q = m->m_act; 725 m_freem(m); 726 } 727 728 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf))); 729 bzero((caddr_t)vifp, sizeof (*vifp)); 730 731 if (mrtdebug) 732 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs); 733 734 /* Adjust numvifs down */ 735 for (vifi = numvifs; vifi > 0; vifi--) 736 if (viftable[vifi-1].v_lcl_addr.s_addr != INADDR_ANY) 737 break; 738 numvifs = vifi; 739 740 splx(s); 741 742 return 0; 743} 744 745/* 746 * update an mfc entry without resetting counters and S,G addresses. 747 */ 748static void 749update_mfc_params(struct mfc *rt, struct mfcctl *mfccp) 750{ 751 int i; 752 753 rt->mfc_parent = mfccp->mfcc_parent; 754 for (i = 0; i < numvifs; i++) 755 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i]; 756} 757 758/* 759 * fully initialize an mfc entry from the parameter. 760 */ 761static void 762init_mfc_params(struct mfc *rt, struct mfcctl *mfccp) 763{ 764 rt->mfc_origin = mfccp->mfcc_origin; 765 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp; 766 767 update_mfc_params(rt, mfccp); 768 769 /* initialize pkt counters per src-grp */ 770 rt->mfc_pkt_cnt = 0; 771 rt->mfc_byte_cnt = 0; 772 rt->mfc_wrong_if = 0; 773 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0; 774} 775 776 777/* 778 * Add an mfc entry 779 */ 780static int 781add_mfc(struct mfcctl *mfccp) 782{ 783 struct mfc *rt; 784 u_long hash; 785 struct rtdetq *rte; 786 u_short nstl; 787 int s; 788 789 rt = mfc_find(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 790 791 /* If an entry already exists, just update the fields */ 792 if (rt) { 793 if (mrtdebug & DEBUG_MFC) 794 log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n", 795 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 796 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 797 mfccp->mfcc_parent); 798 799 s = splnet(); 800 update_mfc_params(rt, mfccp); 801 splx(s); 802 return 0; 803 } 804 805 /* 806 * Find the entry for which the upcall was made and update 807 */ 808 s = splnet(); 809 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr); 810 for (rt = mfctable[hash], nstl = 0; rt; rt = rt->mfc_next) { 811 812 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 813 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) && 814 (rt->mfc_stall != NULL)) { 815 816 if (nstl++) 817 log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n", 818 "multiple kernel entries", 819 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 820 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 821 mfccp->mfcc_parent, (void *)rt->mfc_stall); 822 823 if (mrtdebug & DEBUG_MFC) 824 log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n", 825 (u_long)ntohl(mfccp->mfcc_origin.s_addr), 826 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 827 mfccp->mfcc_parent, (void *)rt->mfc_stall); 828 829 init_mfc_params(rt, mfccp); 830 831 rt->mfc_expire = 0; /* Don't clean this guy up */ 832 nexpire[hash]--; 833 834 /* free packets Qed at the end of this entry */ 835 for (rte = rt->mfc_stall; rte != NULL; ) { 836 struct rtdetq *n = rte->next; 837 838 ip_mdq(rte->m, rte->ifp, rt, -1); 839 m_freem(rte->m); 840 free(rte, M_MRTABLE); 841 rte = n; 842 } 843 rt->mfc_stall = NULL; 844 } 845 } 846 847 /* 848 * It is possible that an entry is being inserted without an upcall 849 */ 850 if (nstl == 0) { 851 if (mrtdebug & DEBUG_MFC) 852 log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n", 853 hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr), 854 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr), 855 mfccp->mfcc_parent); 856 857 for (rt = mfctable[hash]; rt != NULL; rt = rt->mfc_next) { 858 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) && 859 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) { 860 init_mfc_params(rt, mfccp); 861 if (rt->mfc_expire) 862 nexpire[hash]--; 863 rt->mfc_expire = 0; 864 break; /* XXX */ 865 } 866 } 867 if (rt == NULL) { /* no upcall, so make a new entry */ 868 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 869 if (rt == NULL) { 870 splx(s); 871 return ENOBUFS; 872 } 873 874 init_mfc_params(rt, mfccp); 875 rt->mfc_expire = 0; 876 rt->mfc_stall = NULL; 877 878 /* insert new entry at head of hash chain */ 879 rt->mfc_next = mfctable[hash]; 880 mfctable[hash] = rt; 881 } 882 } 883 splx(s); 884 return 0; 885} 886 887/* 888 * Delete an mfc entry 889 */ 890static int 891del_mfc(struct mfcctl *mfccp) 892{ 893 struct in_addr origin; 894 struct in_addr mcastgrp; 895 struct mfc *rt; 896 struct mfc **nptr; 897 u_long hash; 898 int s; 899 900 origin = mfccp->mfcc_origin; 901 mcastgrp = mfccp->mfcc_mcastgrp; 902 903 if (mrtdebug & DEBUG_MFC) 904 log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n", 905 (u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr)); 906 907 s = splnet(); 908 909 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr); 910 for (nptr = &mfctable[hash]; (rt = *nptr) != NULL; nptr = &rt->mfc_next) 911 if (origin.s_addr == rt->mfc_origin.s_addr && 912 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr && 913 rt->mfc_stall == NULL) 914 break; 915 if (rt == NULL) { 916 splx(s); 917 return EADDRNOTAVAIL; 918 } 919 920 *nptr = rt->mfc_next; 921 free(rt, M_MRTABLE); 922 923 splx(s); 924 925 return 0; 926} 927 928/* 929 * Send a message to mrouted on the multicast routing socket 930 */ 931static int 932socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src) 933{ 934 if (s) { 935 if (sbappendaddr(&s->so_rcv, (struct sockaddr *)src, mm, NULL) != 0) { 936 sorwakeup(s); 937 return 0; 938 } 939 } 940 m_freem(mm); 941 return -1; 942} 943 944/* 945 * IP multicast forwarding function. This function assumes that the packet 946 * pointed to by "ip" has arrived on (or is about to be sent to) the interface 947 * pointed to by "ifp", and the packet is to be relayed to other networks 948 * that have members of the packet's destination IP multicast group. 949 * 950 * The packet is returned unscathed to the caller, unless it is 951 * erroneous, in which case a non-zero return value tells the caller to 952 * discard it. 953 */ 954 955#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */ 956 957static int 958X_ip_mforward(struct ip *ip, struct ifnet *ifp, 959 struct mbuf *m, struct ip_moptions *imo) 960{ 961 struct mfc *rt; 962 int s; 963 vifi_t vifi; 964 965 if (mrtdebug & DEBUG_FORWARD) 966 log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n", 967 (u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), 968 (void *)ifp); 969 970 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 || 971 ((u_char *)(ip + 1))[1] != IPOPT_LSRR ) { 972 /* 973 * Packet arrived via a physical interface or 974 * an encapsulated tunnel. 975 */ 976 } else { 977 /* 978 * Packet arrived through a source-route tunnel. 979 * Source-route tunnels are no longer supported. 980 */ 981 static int last_log; 982 if (last_log != time_second) { 983 last_log = time_second; 984 log(LOG_ERR, 985 "ip_mforward: received source-routed packet from %lx\n", 986 (u_long)ntohl(ip->ip_src.s_addr)); 987 } 988 return 1; 989 } 990 991 if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) { 992 if (ip->ip_ttl < 255) 993 ip->ip_ttl++; /* compensate for -1 in *_send routines */ 994 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 995 struct vif *vifp = viftable + vifi; 996 997 printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s%d)\n", 998 (long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr), 999 vifi, 1000 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "", 1001 vifp->v_ifp->if_name, vifp->v_ifp->if_unit); 1002 } 1003 return ip_mdq(m, ifp, NULL, vifi); 1004 } 1005 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) { 1006 printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n", 1007 (long)ntohl(ip->ip_src.s_addr), (long)ntohl(ip->ip_dst.s_addr)); 1008 if (!imo) 1009 printf("In fact, no options were specified at all\n"); 1010 } 1011 1012 /* 1013 * Don't forward a packet with time-to-live of zero or one, 1014 * or a packet destined to a local-only group. 1015 */ 1016 if (ip->ip_ttl <= 1 || ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP) 1017 return 0; 1018 1019 /* 1020 * Determine forwarding vifs from the forwarding cache table 1021 */ 1022 s = splnet(); 1023 ++mrtstat.mrts_mfc_lookups; 1024 rt = mfc_find(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1025 1026 /* Entry exists, so forward if necessary */ 1027 if (rt != NULL) { 1028 splx(s); 1029 return ip_mdq(m, ifp, rt, -1); 1030 } else { 1031 /* 1032 * If we don't have a route for packet's origin, 1033 * Make a copy of the packet & send message to routing daemon 1034 */ 1035 1036 struct mbuf *mb0; 1037 struct rtdetq *rte; 1038 u_long hash; 1039 int hlen = ip->ip_hl << 2; 1040 1041 ++mrtstat.mrts_mfc_misses; 1042 1043 mrtstat.mrts_no_route++; 1044 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC)) 1045 log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n", 1046 (u_long)ntohl(ip->ip_src.s_addr), 1047 (u_long)ntohl(ip->ip_dst.s_addr)); 1048 1049 /* 1050 * Allocate mbufs early so that we don't do extra work if we are 1051 * just going to fail anyway. Make sure to pullup the header so 1052 * that other people can't step on it. 1053 */ 1054 rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, M_NOWAIT); 1055 if (rte == NULL) { 1056 splx(s); 1057 return ENOBUFS; 1058 } 1059 mb0 = m_copy(m, 0, M_COPYALL); 1060 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen)) 1061 mb0 = m_pullup(mb0, hlen); 1062 if (mb0 == NULL) { 1063 free(rte, M_MRTABLE); 1064 splx(s); 1065 return ENOBUFS; 1066 } 1067 1068 /* is there an upcall waiting for this flow ? */ 1069 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr); 1070 for (rt = mfctable[hash]; rt; rt = rt->mfc_next) { 1071 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) && 1072 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) && 1073 (rt->mfc_stall != NULL)) 1074 break; 1075 } 1076 1077 if (rt == NULL) { 1078 int i; 1079 struct igmpmsg *im; 1080 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1081 struct mbuf *mm; 1082 1083 /* 1084 * Locate the vifi for the incoming interface for this packet. 1085 * If none found, drop packet. 1086 */ 1087 for (vifi=0; vifi<numvifs && viftable[vifi].v_ifp != ifp; vifi++) 1088 ; 1089 if (vifi >= numvifs) /* vif not found, drop packet */ 1090 goto non_fatal; 1091 1092 /* no upcall, so make a new entry */ 1093 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); 1094 if (rt == NULL) 1095 goto fail; 1096 /* Make a copy of the header to send to the user level process */ 1097 mm = m_copy(mb0, 0, hlen); 1098 if (mm == NULL) 1099 goto fail1; 1100 1101 /* 1102 * Send message to routing daemon to install 1103 * a route into the kernel table 1104 */ 1105 1106 im = mtod(mm, struct igmpmsg *); 1107 im->im_msgtype = IGMPMSG_NOCACHE; 1108 im->im_mbz = 0; 1109 im->im_vif = vifi; 1110 1111 mrtstat.mrts_upcalls++; 1112 1113 k_igmpsrc.sin_addr = ip->ip_src; 1114 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1115 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n"); 1116 ++mrtstat.mrts_upq_sockfull; 1117fail1: 1118 free(rt, M_MRTABLE); 1119fail: 1120 free(rte, M_MRTABLE); 1121 m_freem(mb0); 1122 splx(s); 1123 return ENOBUFS; 1124 } 1125 1126 /* insert new entry at head of hash chain */ 1127 rt->mfc_origin.s_addr = ip->ip_src.s_addr; 1128 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr; 1129 rt->mfc_expire = UPCALL_EXPIRE; 1130 nexpire[hash]++; 1131 for (i = 0; i < numvifs; i++) 1132 rt->mfc_ttls[i] = 0; 1133 rt->mfc_parent = -1; 1134 1135 /* link into table */ 1136 rt->mfc_next = mfctable[hash]; 1137 mfctable[hash] = rt; 1138 rt->mfc_stall = rte; 1139 1140 } else { 1141 /* determine if q has overflowed */ 1142 int npkts = 0; 1143 struct rtdetq **p; 1144 1145 /* 1146 * XXX ouch! we need to append to the list, but we 1147 * only have a pointer to the front, so we have to 1148 * scan the entire list every time. 1149 */ 1150 for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next) 1151 npkts++; 1152 1153 if (npkts > MAX_UPQ) { 1154 mrtstat.mrts_upq_ovflw++; 1155non_fatal: 1156 free(rte, M_MRTABLE); 1157 m_freem(mb0); 1158 splx(s); 1159 return 0; 1160 } 1161 1162 /* Add this entry to the end of the queue */ 1163 *p = rte; 1164 } 1165 1166 rte->m = mb0; 1167 rte->ifp = ifp; 1168 rte->next = NULL; 1169 1170 splx(s); 1171 1172 return 0; 1173 } 1174} 1175 1176/* 1177 * Clean up the cache entry if upcall is not serviced 1178 */ 1179static void 1180expire_upcalls(void *unused) 1181{ 1182 struct rtdetq *rte; 1183 struct mfc *mfc, **nptr; 1184 int i; 1185 int s; 1186 1187 s = splnet(); 1188 for (i = 0; i < MFCTBLSIZ; i++) { 1189 if (nexpire[i] == 0) 1190 continue; 1191 nptr = &mfctable[i]; 1192 for (mfc = *nptr; mfc != NULL; mfc = *nptr) { 1193 /* 1194 * Skip real cache entries 1195 * Make sure it wasn't marked to not expire (shouldn't happen) 1196 * If it expires now 1197 */ 1198 if (mfc->mfc_stall != NULL && mfc->mfc_expire != 0 && 1199 --mfc->mfc_expire == 0) { 1200 if (mrtdebug & DEBUG_EXPIRE) 1201 log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n", 1202 (u_long)ntohl(mfc->mfc_origin.s_addr), 1203 (u_long)ntohl(mfc->mfc_mcastgrp.s_addr)); 1204 /* 1205 * drop all the packets 1206 * free the mbuf with the pkt, if, timing info 1207 */ 1208 for (rte = mfc->mfc_stall; rte; ) { 1209 struct rtdetq *n = rte->next; 1210 1211 m_freem(rte->m); 1212 free(rte, M_MRTABLE); 1213 rte = n; 1214 } 1215 ++mrtstat.mrts_cache_cleanups; 1216 nexpire[i]--; 1217 1218 *nptr = mfc->mfc_next; 1219 free(mfc, M_MRTABLE); 1220 } else { 1221 nptr = &mfc->mfc_next; 1222 } 1223 } 1224 } 1225 splx(s); 1226 expire_upcalls_ch = timeout(expire_upcalls, NULL, EXPIRE_TIMEOUT); 1227} 1228 1229/* 1230 * Packet forwarding routine once entry in the cache is made 1231 */ 1232static int 1233ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif) 1234{ 1235 struct ip *ip = mtod(m, struct ip *); 1236 vifi_t vifi; 1237 int plen = ip->ip_len; 1238 1239/* 1240 * Macro to send packet on vif. Since RSVP packets don't get counted on 1241 * input, they shouldn't get counted on output, so statistics keeping is 1242 * separate. 1243 */ 1244#define MC_SEND(ip,vifp,m) { \ 1245 if ((vifp)->v_flags & VIFF_TUNNEL) \ 1246 encap_send((ip), (vifp), (m)); \ 1247 else \ 1248 phyint_send((ip), (vifp), (m)); \ 1249} 1250 1251 /* 1252 * If xmt_vif is not -1, send on only the requested vif. 1253 * 1254 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.) 1255 */ 1256 if (xmt_vif < numvifs) { 1257 MC_SEND(ip, viftable + xmt_vif, m); 1258 return 1; 1259 } 1260 1261 /* 1262 * Don't forward if it didn't arrive from the parent vif for its origin. 1263 */ 1264 vifi = rt->mfc_parent; 1265 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) { 1266 /* came in the wrong interface */ 1267 if (mrtdebug & DEBUG_FORWARD) 1268 log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n", 1269 (void *)ifp, vifi, (void *)viftable[vifi].v_ifp); 1270 ++mrtstat.mrts_wrong_if; 1271 ++rt->mfc_wrong_if; 1272 /* 1273 * If we are doing PIM assert processing, and we are forwarding 1274 * packets on this interface, and it is a broadcast medium 1275 * interface (and not a tunnel), send a message to the routing daemon. 1276 */ 1277 if (pim_assert && rt->mfc_ttls[vifi] && 1278 (ifp->if_flags & IFF_BROADCAST) && 1279 !(viftable[vifi].v_flags & VIFF_TUNNEL)) { 1280 struct timeval now; 1281 u_long delta; 1282 1283 GET_TIME(now); 1284 1285 TV_DELTA(rt->mfc_last_assert, now, delta); 1286 1287 if (delta > ASSERT_MSG_TIME) { 1288 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET }; 1289 struct igmpmsg *im; 1290 int hlen = ip->ip_hl << 2; 1291 struct mbuf *mm = m_copy(m, 0, hlen); 1292 1293 if (mm && (M_HASCL(mm) || mm->m_len < hlen)) 1294 mm = m_pullup(mm, hlen); 1295 if (mm == NULL) 1296 return ENOBUFS; 1297 1298 rt->mfc_last_assert = now; 1299 1300 im = mtod(mm, struct igmpmsg *); 1301 im->im_msgtype = IGMPMSG_WRONGVIF; 1302 im->im_mbz = 0; 1303 im->im_vif = vifi; 1304 1305 k_igmpsrc.sin_addr = im->im_src; 1306 1307 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) { 1308 log(LOG_WARNING, 1309 "ip_mforward: ip_mrouter socket queue full\n"); 1310 ++mrtstat.mrts_upq_sockfull; 1311 return ENOBUFS; 1312 } 1313 } 1314 } 1315 return 0; 1316 } 1317 1318 /* If I sourced this packet, it counts as output, else it was input. */ 1319 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) { 1320 viftable[vifi].v_pkt_out++; 1321 viftable[vifi].v_bytes_out += plen; 1322 } else { 1323 viftable[vifi].v_pkt_in++; 1324 viftable[vifi].v_bytes_in += plen; 1325 } 1326 rt->mfc_pkt_cnt++; 1327 rt->mfc_byte_cnt += plen; 1328 1329 /* 1330 * For each vif, decide if a copy of the packet should be forwarded. 1331 * Forward if: 1332 * - the ttl exceeds the vif's threshold 1333 * - there are group members downstream on interface 1334 */ 1335 for (vifi = 0; vifi < numvifs; vifi++) 1336 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) { 1337 viftable[vifi].v_pkt_out++; 1338 viftable[vifi].v_bytes_out += plen; 1339 MC_SEND(ip, viftable+vifi, m); 1340 } 1341 1342 return 0; 1343} 1344 1345/* 1346 * check if a vif number is legal/ok. This is used by ip_output. 1347 */ 1348static int 1349X_legal_vif_num(int vif) 1350{ 1351 return (vif >= 0 && vif < numvifs); 1352} 1353 1354/* 1355 * Return the local address used by this vif 1356 */ 1357static u_long 1358X_ip_mcast_src(int vifi) 1359{ 1360 if (vifi >= 0 && vifi < numvifs) 1361 return viftable[vifi].v_lcl_addr.s_addr; 1362 else 1363 return INADDR_ANY; 1364} 1365 1366static void 1367phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1368{ 1369 struct mbuf *mb_copy; 1370 int hlen = ip->ip_hl << 2; 1371 1372 /* 1373 * Make a new reference to the packet; make sure that 1374 * the IP header is actually copied, not just referenced, 1375 * so that ip_output() only scribbles on the copy. 1376 */ 1377 mb_copy = m_copy(m, 0, M_COPYALL); 1378 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen)) 1379 mb_copy = m_pullup(mb_copy, hlen); 1380 if (mb_copy == NULL) 1381 return; 1382 1383 if (vifp->v_rate_limit == 0) 1384 tbf_send_packet(vifp, mb_copy); 1385 else 1386 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len); 1387} 1388 1389static void 1390encap_send(struct ip *ip, struct vif *vifp, struct mbuf *m) 1391{ 1392 struct mbuf *mb_copy; 1393 struct ip *ip_copy; 1394 int i, len = ip->ip_len; 1395 1396 /* 1397 * XXX: take care of delayed checksums. 1398 * XXX: if network interfaces are capable of computing checksum for 1399 * encapsulated multicast data packets, we need to reconsider this. 1400 */ 1401 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1402 in_delayed_cksum(m); 1403 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1404 } 1405 1406 /* 1407 * copy the old packet & pullup its IP header into the 1408 * new mbuf so we can modify it. Try to fill the new 1409 * mbuf since if we don't the ethernet driver will. 1410 */ 1411 MGETHDR(mb_copy, M_DONTWAIT, MT_HEADER); 1412 if (mb_copy == NULL) 1413 return; 1414#ifdef MAC 1415 mac_create_mbuf_multicast_encap(m, vifp->v_ifp, mb_copy); 1416#endif 1417 mb_copy->m_data += max_linkhdr; 1418 mb_copy->m_len = sizeof(multicast_encap_iphdr); 1419 1420 if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1421 m_freem(mb_copy); 1422 return; 1423 } 1424 i = MHLEN - M_LEADINGSPACE(mb_copy); 1425 if (i > len) 1426 i = len; 1427 mb_copy = m_pullup(mb_copy, i); 1428 if (mb_copy == NULL) 1429 return; 1430 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr); 1431 1432 /* 1433 * fill in the encapsulating IP header. 1434 */ 1435 ip_copy = mtod(mb_copy, struct ip *); 1436 *ip_copy = multicast_encap_iphdr; 1437#ifdef RANDOM_IP_ID 1438 ip_copy->ip_id = ip_randomid(); 1439#else 1440 ip_copy->ip_id = htons(ip_id++); 1441#endif 1442 ip_copy->ip_len += len; 1443 ip_copy->ip_src = vifp->v_lcl_addr; 1444 ip_copy->ip_dst = vifp->v_rmt_addr; 1445 1446 /* 1447 * turn the encapsulated IP header back into a valid one. 1448 */ 1449 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr)); 1450 --ip->ip_ttl; 1451 ip->ip_len = htons(ip->ip_len); 1452 ip->ip_off = htons(ip->ip_off); 1453 ip->ip_sum = 0; 1454 mb_copy->m_data += sizeof(multicast_encap_iphdr); 1455 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2); 1456 mb_copy->m_data -= sizeof(multicast_encap_iphdr); 1457 1458 if (vifp->v_rate_limit == 0) 1459 tbf_send_packet(vifp, mb_copy); 1460 else 1461 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len); 1462} 1463 1464/* 1465 * Token bucket filter module 1466 */ 1467 1468static void 1469tbf_control(struct vif *vifp, struct mbuf *m, struct ip *ip, u_long p_len) 1470{ 1471 struct tbf *t = vifp->v_tbf; 1472 1473 if (p_len > MAX_BKT_SIZE) { /* drop if packet is too large */ 1474 mrtstat.mrts_pkt2large++; 1475 m_freem(m); 1476 return; 1477 } 1478 1479 tbf_update_tokens(vifp); 1480 1481 if (t->tbf_q_len == 0) { /* queue empty... */ 1482 if (p_len <= t->tbf_n_tok) { /* send packet if enough tokens */ 1483 t->tbf_n_tok -= p_len; 1484 tbf_send_packet(vifp, m); 1485 } else { /* no, queue packet and try later */ 1486 tbf_queue(vifp, m); 1487 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1488 } 1489 } else if (t->tbf_q_len < t->tbf_max_q_len) { 1490 /* finite queue length, so queue pkts and process queue */ 1491 tbf_queue(vifp, m); 1492 tbf_process_q(vifp); 1493 } else { 1494 /* queue full, try to dq and queue and process */ 1495 if (!tbf_dq_sel(vifp, ip)) { 1496 mrtstat.mrts_q_overflow++; 1497 m_freem(m); 1498 } else { 1499 tbf_queue(vifp, m); 1500 tbf_process_q(vifp); 1501 } 1502 } 1503} 1504 1505/* 1506 * adds a packet to the queue at the interface 1507 */ 1508static void 1509tbf_queue(struct vif *vifp, struct mbuf *m) 1510{ 1511 int s = splnet(); 1512 struct tbf *t = vifp->v_tbf; 1513 1514 if (t->tbf_t == NULL) /* Queue was empty */ 1515 t->tbf_q = m; 1516 else /* Insert at tail */ 1517 t->tbf_t->m_act = m; 1518 1519 t->tbf_t = m; /* Set new tail pointer */ 1520 1521#ifdef DIAGNOSTIC 1522 /* Make sure we didn't get fed a bogus mbuf */ 1523 if (m->m_act) 1524 panic("tbf_queue: m_act"); 1525#endif 1526 m->m_act = NULL; 1527 1528 t->tbf_q_len++; 1529 1530 splx(s); 1531} 1532 1533/* 1534 * processes the queue at the interface 1535 */ 1536static void 1537tbf_process_q(struct vif *vifp) 1538{ 1539 int s = splnet(); 1540 struct tbf *t = vifp->v_tbf; 1541 1542 /* loop through the queue at the interface and send as many packets 1543 * as possible 1544 */ 1545 while (t->tbf_q_len > 0) { 1546 struct mbuf *m = t->tbf_q; 1547 int len = mtod(m, struct ip *)->ip_len; 1548 1549 /* determine if the packet can be sent */ 1550 if (len > t->tbf_n_tok) /* not enough tokens, we are done */ 1551 break; 1552 /* ok, reduce no of tokens, dequeue and send the packet. */ 1553 t->tbf_n_tok -= len; 1554 1555 t->tbf_q = m->m_act; 1556 if (--t->tbf_q_len == 0) 1557 t->tbf_t = NULL; 1558 1559 m->m_act = NULL; 1560 tbf_send_packet(vifp, m); 1561 } 1562 splx(s); 1563} 1564 1565static void 1566tbf_reprocess_q(void *xvifp) 1567{ 1568 struct vif *vifp = xvifp; 1569 1570 if (ip_mrouter == NULL) 1571 return; 1572 tbf_update_tokens(vifp); 1573 tbf_process_q(vifp); 1574 if (vifp->v_tbf->tbf_q_len) 1575 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS); 1576} 1577 1578/* function that will selectively discard a member of the queue 1579 * based on the precedence value and the priority 1580 */ 1581static int 1582tbf_dq_sel(struct vif *vifp, struct ip *ip) 1583{ 1584 int s = splnet(); 1585 u_int p; 1586 struct mbuf *m, *last; 1587 struct mbuf **np; 1588 struct tbf *t = vifp->v_tbf; 1589 1590 p = priority(vifp, ip); 1591 1592 np = &t->tbf_q; 1593 last = NULL; 1594 while ((m = *np) != NULL) { 1595 if (p > priority(vifp, mtod(m, struct ip *))) { 1596 *np = m->m_act; 1597 /* If we're removing the last packet, fix the tail pointer */ 1598 if (m == t->tbf_t) 1599 t->tbf_t = last; 1600 m_freem(m); 1601 /* It's impossible for the queue to be empty, but check anyways. */ 1602 if (--t->tbf_q_len == 0) 1603 t->tbf_t = NULL; 1604 splx(s); 1605 mrtstat.mrts_drop_sel++; 1606 return 1; 1607 } 1608 np = &m->m_act; 1609 last = m; 1610 } 1611 splx(s); 1612 return 0; 1613} 1614 1615static void 1616tbf_send_packet(struct vif *vifp, struct mbuf *m) 1617{ 1618 int s = splnet(); 1619 1620 if (vifp->v_flags & VIFF_TUNNEL) /* If tunnel options */ 1621 ip_output(m, NULL, &vifp->v_route, IP_FORWARDING, NULL, NULL); 1622 else { 1623 struct ip_moptions imo; 1624 int error; 1625 static struct route ro; /* XXX check this */ 1626 1627 imo.imo_multicast_ifp = vifp->v_ifp; 1628 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; 1629 imo.imo_multicast_loop = 1; 1630 imo.imo_multicast_vif = -1; 1631 1632 /* 1633 * Re-entrancy should not be a problem here, because 1634 * the packets that we send out and are looped back at us 1635 * should get rejected because they appear to come from 1636 * the loopback interface, thus preventing looping. 1637 */ 1638 error = ip_output(m, NULL, &ro, IP_FORWARDING, &imo, NULL); 1639 1640 if (mrtdebug & DEBUG_XMIT) 1641 log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 1642 (int)(vifp - viftable), error); 1643 } 1644 splx(s); 1645} 1646 1647/* determine the current time and then 1648 * the elapsed time (between the last time and time now) 1649 * in milliseconds & update the no. of tokens in the bucket 1650 */ 1651static void 1652tbf_update_tokens(struct vif *vifp) 1653{ 1654 struct timeval tp; 1655 u_long tm; 1656 int s = splnet(); 1657 struct tbf *t = vifp->v_tbf; 1658 1659 GET_TIME(tp); 1660 1661 TV_DELTA(tp, t->tbf_last_pkt_t, tm); 1662 1663 /* 1664 * This formula is actually 1665 * "time in seconds" * "bytes/second". 1666 * 1667 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8) 1668 * 1669 * The (1000/1024) was introduced in add_vif to optimize 1670 * this divide into a shift. 1671 */ 1672 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8; 1673 t->tbf_last_pkt_t = tp; 1674 1675 if (t->tbf_n_tok > MAX_BKT_SIZE) 1676 t->tbf_n_tok = MAX_BKT_SIZE; 1677 1678 splx(s); 1679} 1680 1681static int 1682priority(struct vif *vifp, struct ip *ip) 1683{ 1684 int prio = 50; /* the lowest priority -- default case */ 1685 1686 /* temporary hack; may add general packet classifier some day */ 1687 1688 /* 1689 * The UDP port space is divided up into four priority ranges: 1690 * [0, 16384) : unclassified - lowest priority 1691 * [16384, 32768) : audio - highest priority 1692 * [32768, 49152) : whiteboard - medium priority 1693 * [49152, 65536) : video - low priority 1694 * 1695 * Everything else gets lowest priority. 1696 */ 1697 if (ip->ip_p == IPPROTO_UDP) { 1698 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2)); 1699 switch (ntohs(udp->uh_dport) & 0xc000) { 1700 case 0x4000: 1701 prio = 70; 1702 break; 1703 case 0x8000: 1704 prio = 60; 1705 break; 1706 case 0xc000: 1707 prio = 55; 1708 break; 1709 } 1710 } 1711 return prio; 1712} 1713 1714/* 1715 * End of token bucket filter modifications 1716 */ 1717 1718static int 1719X_ip_rsvp_vif(struct socket *so, struct sockopt *sopt) 1720{ 1721 int error, vifi, s; 1722 1723 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 1724 return EOPNOTSUPP; 1725 1726 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi); 1727 if (error) 1728 return error; 1729 1730 s = splnet(); 1731 1732 if (vifi < 0 || vifi >= numvifs) { /* Error if vif is invalid */ 1733 splx(s); 1734 return EADDRNOTAVAIL; 1735 } 1736 1737 if (sopt->sopt_name == IP_RSVP_VIF_ON) { 1738 /* Check if socket is available. */ 1739 if (viftable[vifi].v_rsvpd != NULL) { 1740 splx(s); 1741 return EADDRINUSE; 1742 } 1743 1744 viftable[vifi].v_rsvpd = so; 1745 /* This may seem silly, but we need to be sure we don't over-increment 1746 * the RSVP counter, in case something slips up. 1747 */ 1748 if (!viftable[vifi].v_rsvp_on) { 1749 viftable[vifi].v_rsvp_on = 1; 1750 rsvp_on++; 1751 } 1752 } else { /* must be VIF_OFF */ 1753 /* 1754 * XXX as an additional consistency check, one could make sure 1755 * that viftable[vifi].v_rsvpd == so, otherwise passing so as 1756 * first parameter is pretty useless. 1757 */ 1758 viftable[vifi].v_rsvpd = NULL; 1759 /* 1760 * This may seem silly, but we need to be sure we don't over-decrement 1761 * the RSVP counter, in case something slips up. 1762 */ 1763 if (viftable[vifi].v_rsvp_on) { 1764 viftable[vifi].v_rsvp_on = 0; 1765 rsvp_on--; 1766 } 1767 } 1768 splx(s); 1769 return 0; 1770} 1771 1772static void 1773X_ip_rsvp_force_done(struct socket *so) 1774{ 1775 int vifi; 1776 int s; 1777 1778 /* Don't bother if it is not the right type of socket. */ 1779 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP) 1780 return; 1781 1782 s = splnet(); 1783 1784 /* The socket may be attached to more than one vif...this 1785 * is perfectly legal. 1786 */ 1787 for (vifi = 0; vifi < numvifs; vifi++) { 1788 if (viftable[vifi].v_rsvpd == so) { 1789 viftable[vifi].v_rsvpd = NULL; 1790 /* This may seem silly, but we need to be sure we don't 1791 * over-decrement the RSVP counter, in case something slips up. 1792 */ 1793 if (viftable[vifi].v_rsvp_on) { 1794 viftable[vifi].v_rsvp_on = 0; 1795 rsvp_on--; 1796 } 1797 } 1798 } 1799 1800 splx(s); 1801} 1802 1803static void 1804X_rsvp_input(struct mbuf *m, int off) 1805{ 1806 int vifi; 1807 struct ip *ip = mtod(m, struct ip *); 1808 struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET }; 1809 int s; 1810 struct ifnet *ifp; 1811 1812 if (rsvpdebug) 1813 printf("rsvp_input: rsvp_on %d\n",rsvp_on); 1814 1815 /* Can still get packets with rsvp_on = 0 if there is a local member 1816 * of the group to which the RSVP packet is addressed. But in this 1817 * case we want to throw the packet away. 1818 */ 1819 if (!rsvp_on) { 1820 m_freem(m); 1821 return; 1822 } 1823 1824 s = splnet(); 1825 1826 if (rsvpdebug) 1827 printf("rsvp_input: check vifs\n"); 1828 1829#ifdef DIAGNOSTIC 1830 M_ASSERTPKTHDR(m); 1831#endif 1832 1833 ifp = m->m_pkthdr.rcvif; 1834 /* Find which vif the packet arrived on. */ 1835 for (vifi = 0; vifi < numvifs; vifi++) 1836 if (viftable[vifi].v_ifp == ifp) 1837 break; 1838 1839 if (vifi == numvifs || viftable[vifi].v_rsvpd == NULL) { 1840 /* 1841 * If the old-style non-vif-associated socket is set, 1842 * then use it. Otherwise, drop packet since there 1843 * is no specific socket for this vif. 1844 */ 1845 if (ip_rsvpd != NULL) { 1846 if (rsvpdebug) 1847 printf("rsvp_input: Sending packet up old-style socket\n"); 1848 rip_input(m, off); /* xxx */ 1849 } else { 1850 if (rsvpdebug && vifi == numvifs) 1851 printf("rsvp_input: Can't find vif for packet.\n"); 1852 else if (rsvpdebug && viftable[vifi].v_rsvpd == NULL) 1853 printf("rsvp_input: No socket defined for vif %d\n",vifi); 1854 m_freem(m); 1855 } 1856 splx(s); 1857 return; 1858 } 1859 rsvp_src.sin_addr = ip->ip_src; 1860 1861 if (rsvpdebug && m) 1862 printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n", 1863 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv))); 1864 1865 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) { 1866 if (rsvpdebug) 1867 printf("rsvp_input: Failed to append to socket\n"); 1868 } else { 1869 if (rsvpdebug) 1870 printf("rsvp_input: send packet up\n"); 1871 } 1872 1873 splx(s); 1874} 1875 1876static int 1877ip_mroute_modevent(module_t mod, int type, void *unused) 1878{ 1879 int s; 1880 1881 switch (type) { 1882 case MOD_LOAD: 1883 s = splnet(); 1884 /* XXX Protect against multiple loading */ 1885 ip_mcast_src = X_ip_mcast_src; 1886 ip_mforward = X_ip_mforward; 1887 ip_mrouter_done = X_ip_mrouter_done; 1888 ip_mrouter_get = X_ip_mrouter_get; 1889 ip_mrouter_set = X_ip_mrouter_set; 1890 ip_rsvp_force_done = X_ip_rsvp_force_done; 1891 ip_rsvp_vif = X_ip_rsvp_vif; 1892 legal_vif_num = X_legal_vif_num; 1893 mrt_ioctl = X_mrt_ioctl; 1894 rsvp_input_p = X_rsvp_input; 1895 splx(s); 1896 break; 1897 1898 case MOD_UNLOAD: 1899 if (ip_mrouter) 1900 return EINVAL; 1901 1902 s = splnet(); 1903 ip_mcast_src = NULL; 1904 ip_mforward = NULL; 1905 ip_mrouter_done = NULL; 1906 ip_mrouter_get = NULL; 1907 ip_mrouter_set = NULL; 1908 ip_rsvp_force_done = NULL; 1909 ip_rsvp_vif = NULL; 1910 legal_vif_num = NULL; 1911 mrt_ioctl = NULL; 1912 rsvp_input_p = NULL; 1913 splx(s); 1914 break; 1915 } 1916 return 0; 1917} 1918 1919static moduledata_t ip_mroutemod = { 1920 "ip_mroute", 1921 ip_mroute_modevent, 1922 0 1923}; 1924DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1925