1/*
2 * IP multicast forwarding procedures
3 *
4 * Written by David Waitzman, BBN Labs, August 1988.
5 * Modified by Steve Deering, Stanford, February 1989.
6 * Modified by Mark J. Steiglitz, Stanford, May, 1991
7 * Modified by Van Jacobson, LBL, January 1993
8 * Modified by Ajit Thyagarajan, PARC, August 1993
9 * Modified by Bill Fenner, PARC, April 1995
10 *
11 * MROUTING Revision: 3.5
12 * $Id: ip_mroute.c,v 1.53 1999/01/18 02:06:57 fenner Exp $
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
54extern u_long _ip_mcast_src __P((int vifi));
55extern int _ip_mforward __P((struct ip *ip, struct ifnet *ifp,
56 struct mbuf *m, struct ip_moptions *imo));
57extern int _ip_mrouter_done __P((void));
58extern int _ip_mrouter_get __P((struct socket *so, struct sockopt *sopt));
59extern int _ip_mrouter_set __P((struct socket *so, struct sockopt *sopt));
60extern 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
66struct socket *ip_mrouter = NULL;
67u_int rsvpdebug = 0;
68
69int
70_ip_mrouter_set(so, sopt)
71 struct socket *so;
72 struct sockopt *sopt;
73{
74 return(EOPNOTSUPP);
75}
76
77int (*ip_mrouter_set)(struct socket *, struct sockopt *) = _ip_mrouter_set;
78
79
80int
81_ip_mrouter_get(so, sopt)
82 struct socket *so;
83 struct sockopt *sopt;
84{
85 return(EOPNOTSUPP);
86}
87
88int (*ip_mrouter_get)(struct socket *, struct sockopt *) = _ip_mrouter_get;
89
90int
91_ip_mrouter_done()
92{
93 return(0);
94}
95
96int (*ip_mrouter_done)(void) = _ip_mrouter_done;
97
98int
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
108int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
109 struct ip_moptions *) = _ip_mforward;
110
111int
112_mrt_ioctl(int req, caddr_t data, struct proc *p)
113{
114 return EOPNOTSUPP;
115}
116
117int (*mrt_ioctl)(int, caddr_t, struct proc *) = _mrt_ioctl;
118
119void
120rsvp_input(m, iphlen) /* XXX must fixup manually */
121 struct mbuf *m;
122 int iphlen;
123{
124 /* Can still get packets with rsvp_on = 0 if there is a local member
125 * of the group to which the RSVP packet is addressed. But in this
126 * case we want to throw the packet away.
127 */
128 if (!rsvp_on) {
129 m_freem(m);
130 return;
131 }
132
133 if (ip_rsvpd != NULL) {
134 if (rsvpdebug)
135 printf("rsvp_input: Sending packet up old-style socket\n");
136 rip_input(m, iphlen);
137 return;
138 }
139 /* Drop the packet */
140 m_freem(m);
141}
142
143void ipip_input(struct mbuf *m, int iphlen) { /* XXX must fixup manually */
144 rip_input(m, iphlen);
145}
146
147int (*legal_vif_num)(int) = 0;
148
149/*
150 * This should never be called, since IP_MULTICAST_VIF should fail, but
151 * just in case it does get called, the code a little lower in ip_output
152 * will assign the packet a local address.
153 */
154u_long
155_ip_mcast_src(int vifi) { return INADDR_ANY; }
156u_long (*ip_mcast_src)(int) = _ip_mcast_src;
157
158int
159ip_rsvp_vif_init(so, sopt)
160 struct socket *so;
161 struct sockopt *sopt;
162{
163 return(EINVAL);
164}
165
166int
167ip_rsvp_vif_done(so, sopt)
168 struct socket *so;
169 struct sockopt *sopt;
170{
171 return(EINVAL);
172}
173
174void
175ip_rsvp_force_done(so)
176 struct socket *so;
177{
178 return;
179}
180
181#else /* MROUTING */
182
183#define M_HASCL(m) ((m)->m_flags & M_EXT)
184
185#define INSIZ sizeof(struct in_addr)
186#define same(a1, a2) \
187 (bcmp((caddr_t)(a1), (caddr_t)(a2), INSIZ) == 0)
188
189static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast routing tables");
190
191/*
192 * Globals. All but ip_mrouter and ip_mrtproto could be static,
193 * except for netstat or debugging purposes.
194 */
195#ifndef MROUTE_LKM
196struct socket *ip_mrouter = NULL;
197static struct mrtstat mrtstat;
198#else /* MROUTE_LKM */
199extern void X_ipip_input __P((struct mbuf *m, int iphlen));
200extern struct mrtstat mrtstat;
201static int ip_mrtproto;
202#endif
203
204#define NO_RTE_FOUND 0x1
205#define RTE_FOUND 0x2
206
207static struct mfc *mfctable[MFCTBLSIZ];
208static u_char nexpire[MFCTBLSIZ];
209static struct vif viftable[MAXVIFS];
210static u_int mrtdebug = 0; /* debug level */
211#define DEBUG_MFC 0x02
212#define DEBUG_FORWARD 0x04
213#define DEBUG_EXPIRE 0x08
214#define DEBUG_XMIT 0x10
215static u_int tbfdebug = 0; /* tbf debug level */
216static u_int rsvpdebug = 0; /* rsvp debug level */
217
218static struct callout_handle expire_upcalls_ch;
219
220#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
221#define UPCALL_EXPIRE 6 /* number of timeouts */
222
223/*
224 * Define the token bucket filter structures
225 * tbftable -> each vif has one of these for storing info
226 */
227
228static struct tbf tbftable[MAXVIFS];
229#define TBF_REPROCESS (hz / 100) /* 100x / second */
230
231/*
232 * 'Interfaces' associated with decapsulator (so we can tell
233 * packets that went through it from ones that get reflected
234 * by a broken gateway). These interfaces are never linked into
235 * the system ifnet list & no routes point to them. I.e., packets
236 * can't be sent this way. They only exist as a placeholder for
237 * multicast source verification.
238 */
239static struct ifnet multicast_decap_if[MAXVIFS];
240
241#define ENCAP_TTL 64
242#define ENCAP_PROTO IPPROTO_IPIP /* 4 */
243
244/* prototype IP hdr for encapsulated packets */
245static struct ip multicast_encap_iphdr = {
246#if BYTE_ORDER == LITTLE_ENDIAN
247 sizeof(struct ip) >> 2, IPVERSION,
248#else
249 IPVERSION, sizeof(struct ip) >> 2,
250#endif
251 0, /* tos */
252 sizeof(struct ip), /* total length */
253 0, /* id */
254 0, /* frag offset */
255 ENCAP_TTL, ENCAP_PROTO,
256 0, /* checksum */
257};
258
259/*
260 * Private variables.
261 */
262static vifi_t numvifs = 0;
263static int have_encap_tunnel = 0;
264
265/*
266 * one-back cache used by ipip_input to locate a tunnel's vif
267 * given a datagram's src ip address.
268 */
269static u_long last_encap_src;
270static struct vif *last_encap_vif;
271
272static u_long X_ip_mcast_src __P((int vifi));
273static int X_ip_mforward __P((struct ip *ip, struct ifnet *ifp, struct mbuf *m, struct ip_moptions *imo));
274static int X_ip_mrouter_done __P((void));
275static int X_ip_mrouter_get __P((struct socket *so, struct sockopt *m));
276static int X_ip_mrouter_set __P((struct socket *so, struct sockopt *m));
277static int X_legal_vif_num __P((int vif));
278static int X_mrt_ioctl __P((int cmd, caddr_t data));
279
280static int get_sg_cnt(struct sioc_sg_req *);
281static int get_vif_cnt(struct sioc_vif_req *);
282static int ip_mrouter_init(struct socket *, int);
283static int add_vif(struct vifctl *);
284static int del_vif(vifi_t);
285static int add_mfc(struct mfcctl *);
286static int del_mfc(struct mfcctl *);
287static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *);
288static int set_assert(int);
289static void expire_upcalls(void *);
290static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *,
291 vifi_t);
292static void phyint_send(struct ip *, struct vif *, struct mbuf *);
293static void encap_send(struct ip *, struct vif *, struct mbuf *);
294static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long);
295static void tbf_queue(struct vif *, struct mbuf *);
296static void tbf_process_q(struct vif *);
297static void tbf_reprocess_q(void *);
298static int tbf_dq_sel(struct vif *, struct ip *);
299static void tbf_send_packet(struct vif *, struct mbuf *);
300static void tbf_update_tokens(struct vif *);
301static int priority(struct vif *, struct ip *);
302void multiencap_decap(struct mbuf *);
303
304/*
305 * whether or not special PIM assert processing is enabled.
306 */
307static int pim_assert;
308/*
309 * Rate limit for assert notification messages, in usec
310 */
311#define ASSERT_MSG_TIME 3000000
312
313/*
314 * Hash function for a source, group entry
315 */
316#define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \
317 ((g) >> 20) ^ ((g) >> 10) ^ (g))
318
319/*
320 * Find a route for a given origin IP address and Multicast group address
321 * Type of service parameter to be added in the future!!!
322 */
323
324#define MFCFIND(o, g, rt) { \
325 register struct mfc *_rt = mfctable[MFCHASH(o,g)]; \
326 rt = NULL; \
327 ++mrtstat.mrts_mfc_lookups; \
328 while (_rt) { \
329 if ((_rt->mfc_origin.s_addr == o) && \
330 (_rt->mfc_mcastgrp.s_addr == g) && \
331 (_rt->mfc_stall == NULL)) { \
332 rt = _rt; \
333 break; \
334 } \
335 _rt = _rt->mfc_next; \
336 } \
337 if (rt == NULL) { \
338 ++mrtstat.mrts_mfc_misses; \
339 } \
340}
341
342
343/*
344 * Macros to compute elapsed time efficiently
345 * Borrowed from Van Jacobson's scheduling code
346 */
347#define TV_DELTA(a, b, delta) { \
348 register int xxs; \
349 \
350 delta = (a).tv_usec - (b).tv_usec; \
351 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
352 switch (xxs) { \
353 case 2: \
354 delta += 1000000; \
355 /* fall through */ \
356 case 1: \
357 delta += 1000000; \
358 break; \
359 default: \
360 delta += (1000000 * xxs); \
361 } \
362 } \
363}
364
365#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
366 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
367
368#ifdef UPCALL_TIMING
369u_long upcall_data[51];
370static void collate(struct timeval *);
371#endif /* UPCALL_TIMING */
372
373
374/*
375 * Handle MRT setsockopt commands to modify the multicast routing tables.
376 */
377static int
378X_ip_mrouter_set(so, sopt)
379 struct socket *so;
380 struct sockopt *sopt;
381{
382 int error, optval;
383 vifi_t vifi;
384 struct vifctl vifc;
385 struct mfcctl mfc;
386
387 if (so != ip_mrouter && sopt->sopt_name != MRT_INIT)
388 return (EPERM);
389
390 error = 0;
391 switch (sopt->sopt_name) {
392 case MRT_INIT:
393 error = sooptcopyin(sopt, &optval, sizeof optval,
394 sizeof optval);
395 if (error)
396 break;
397 error = ip_mrouter_init(so, optval);
398 break;
399
400 case MRT_DONE:
401 error = ip_mrouter_done();
402 break;
403
404 case MRT_ADD_VIF:
405 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc);
406 if (error)
407 break;
408 error = add_vif(&vifc);
409 break;
410
411 case MRT_DEL_VIF:
412 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
413 if (error)
414 break;
415 error = del_vif(vifi);
416 break;
417
418 case MRT_ADD_MFC:
419 case MRT_DEL_MFC:
420 error = sooptcopyin(sopt, &mfc, sizeof mfc, sizeof mfc);
421 if (error)
422 break;
423 if (sopt->sopt_name == MRT_ADD_MFC)
424 error = add_mfc(&mfc);
425 else
426 error = del_mfc(&mfc);
427 break;
428
429 case MRT_ASSERT:
430 error = sooptcopyin(sopt, &optval, sizeof optval,
431 sizeof optval);
432 if (error)
433 break;
434 set_assert(optval);
435 break;
436
437 default:
438 error = EOPNOTSUPP;
439 break;
440 }
441 return (error);
442}
443
444#ifndef MROUTE_LKM
445int (*ip_mrouter_set)(struct socket *, struct sockopt *) = X_ip_mrouter_set;
446#endif
447
448/*
449 * Handle MRT getsockopt commands
450 */
451static int
452X_ip_mrouter_get(so, sopt)
453 struct socket *so;
454 struct sockopt *sopt;
455{
456 int error;
457 static int version = 0x0305; /* !!! why is this here? XXX */
458
459 switch (sopt->sopt_name) {
460 case MRT_VERSION:
461 error = sooptcopyout(sopt, &version, sizeof version);
462 break;
463
464 case MRT_ASSERT:
465 error = sooptcopyout(sopt, &pim_assert, sizeof pim_assert);
466 break;
467 default:
468 error = EOPNOTSUPP;
469 break;
470 }
471 return (error);
472}
473
474#ifndef MROUTE_LKM
475int (*ip_mrouter_get)(struct socket *, struct sockopt *) = X_ip_mrouter_get;
476#endif
477
478/*
479 * Handle ioctl commands to obtain information from the cache
480 */
481static int
482X_mrt_ioctl(cmd, data)
483 int cmd;
484 caddr_t data;
485{
486 int error = 0;
487
488 switch (cmd) {
489 case (SIOCGETVIFCNT):
490 return (get_vif_cnt((struct sioc_vif_req *)data));
491 break;
492 case (SIOCGETSGCNT):
493 return (get_sg_cnt((struct sioc_sg_req *)data));
494 break;
495 default:
496 return (EINVAL);
497 break;
498 }
499 return error;
500}
501
502#ifndef MROUTE_LKM
503int (*mrt_ioctl)(int, caddr_t) = X_mrt_ioctl;
504#endif
505
506/*
507 * returns the packet, byte, rpf-failure count for the source group provided
508 */
509static int
510get_sg_cnt(req)
511 register struct sioc_sg_req *req;
512{
513 register struct mfc *rt;
514 int s;
515
516 s = splnet();
517 MFCFIND(req->src.s_addr, req->grp.s_addr, rt);
518 splx(s);
519 if (rt != NULL) {
520 req->pktcnt = rt->mfc_pkt_cnt;
521 req->bytecnt = rt->mfc_byte_cnt;
522 req->wrong_if = rt->mfc_wrong_if;
523 } else
524 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
525
526 return 0;
527}
528
529/*
530 * returns the input and output packet and byte counts on the vif provided
531 */
532static int
533get_vif_cnt(req)
534 register struct sioc_vif_req *req;
535{
536 register vifi_t vifi = req->vifi;
537
538 if (vifi >= numvifs) return EINVAL;
539
540 req->icount = viftable[vifi].v_pkt_in;
541 req->ocount = viftable[vifi].v_pkt_out;
542 req->ibytes = viftable[vifi].v_bytes_in;
543 req->obytes = viftable[vifi].v_bytes_out;
544
545 return 0;
546}
547
548/*
549 * Enable multicast routing
550 */
551static int
552ip_mrouter_init(so, version)
553 struct socket *so;
554 int version;
555{
556 if (mrtdebug)
557 log(LOG_DEBUG,"ip_mrouter_init: so_type = %d, pr_protocol = %d\n",
558 so->so_type, so->so_proto->pr_protocol);
559
560 if (so->so_type != SOCK_RAW ||
561 so->so_proto->pr_protocol != IPPROTO_IGMP) return EOPNOTSUPP;
562
563 if (version != 1)
564 return ENOPROTOOPT;
565
566 if (ip_mrouter != NULL) return EADDRINUSE;
567
568 ip_mrouter = so;
569
570 bzero((caddr_t)mfctable, sizeof(mfctable));
571 bzero((caddr_t)nexpire, sizeof(nexpire));
572
573 pim_assert = 0;
574
575 expire_upcalls_ch = timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
576
577 if (mrtdebug)
578 log(LOG_DEBUG, "ip_mrouter_init\n");
579
580 return 0;
581}
582
583/*
584 * Disable multicast routing
585 */
586static int
587X_ip_mrouter_done()
588{
589 vifi_t vifi;
590 int i;
591 struct ifnet *ifp;
592 struct ifreq ifr;
593 struct mfc *rt;
594 struct rtdetq *rte;
595 int s;
596
597 s = splnet();
598
599 /*
600 * For each phyint in use, disable promiscuous reception of all IP
601 * multicasts.
602 */
603 for (vifi = 0; vifi < numvifs; vifi++) {
604 if (viftable[vifi].v_lcl_addr.s_addr != 0 &&
605 !(viftable[vifi].v_flags & VIFF_TUNNEL)) {
606 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET;
607 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr
608 = INADDR_ANY;
609 ifp = viftable[vifi].v_ifp;
610 if_allmulti(ifp, 0);
611 }
612 }
613 bzero((caddr_t)tbftable, sizeof(tbftable));
614 bzero((caddr_t)viftable, sizeof(viftable));
615 numvifs = 0;
616 pim_assert = 0;
617
618 untimeout(expire_upcalls, (caddr_t)NULL, expire_upcalls_ch);
619
620 /*
621 * Free all multicast forwarding cache entries.
622 */
623 for (i = 0; i < MFCTBLSIZ; i++) {
624 for (rt = mfctable[i]; rt != NULL; ) {
625 struct mfc *nr = rt->mfc_next;
626
627 for (rte = rt->mfc_stall; rte != NULL; ) {
628 struct rtdetq *n = rte->next;
629
630 m_freem(rte->m);
631 free(rte, M_MRTABLE);
632 rte = n;
633 }
634 free(rt, M_MRTABLE);
635 rt = nr;
636 }
637 }
638
639 bzero((caddr_t)mfctable, sizeof(mfctable));
640
641 /*
642 * Reset de-encapsulation cache
643 */
644 last_encap_src = 0;
645 last_encap_vif = NULL;
646 have_encap_tunnel = 0;
647
648 ip_mrouter = NULL;
649
650 splx(s);
651
652 if (mrtdebug)
653 log(LOG_DEBUG, "ip_mrouter_done\n");
654
655 return 0;
656}
657
658#ifndef MROUTE_LKM
659int (*ip_mrouter_done)(void) = X_ip_mrouter_done;
660#endif
661
662/*
663 * Set PIM assert processing global
664 */
665static int
666set_assert(i)
667 int i;
668{
669 if ((i != 1) && (i != 0))
670 return EINVAL;
671
672 pim_assert = i;
673
674 return 0;
675}
676
677/*
678 * Add a vif to the vif table
679 */
680static int
681add_vif(vifcp)
682 register struct vifctl *vifcp;
683{
684 register struct vif *vifp = viftable + vifcp->vifc_vifi;
685 static struct sockaddr_in sin = {sizeof sin, AF_INET};
686 struct ifaddr *ifa;
687 struct ifnet *ifp;
688 int error, s;
689 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi;
690
691 if (vifcp->vifc_vifi >= MAXVIFS) return EINVAL;
692 if (vifp->v_lcl_addr.s_addr != 0) return EADDRINUSE;
693
694 /* Find the interface with an address in AF_INET family */
695 sin.sin_addr = vifcp->vifc_lcl_addr;
696 ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
697 if (ifa == 0) return EADDRNOTAVAIL;
698 ifp = ifa->ifa_ifp;
699
700 if (vifcp->vifc_flags & VIFF_TUNNEL) {
701 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) {
702 /*
703 * An encapsulating tunnel is wanted. Tell ipip_input() to
704 * start paying attention to encapsulated packets.
705 */
706 if (have_encap_tunnel == 0) {
707 have_encap_tunnel = 1;
708 for (s = 0; s < MAXVIFS; ++s) {
709 multicast_decap_if[s].if_name = "mdecap";
710 multicast_decap_if[s].if_unit = s;
711 }
712 }
713 /*
714 * Set interface to fake encapsulator interface
715 */
716 ifp = &multicast_decap_if[vifcp->vifc_vifi];
717 /*
718 * Prepare cached route entry
719 */
720 bzero(&vifp->v_route, sizeof(vifp->v_route));
721 } else {
722 log(LOG_ERR, "source routed tunnels not supported\n");
723 return EOPNOTSUPP;
724 }
725 } else {
726 /* Make sure the interface supports multicast */
727 if ((ifp->if_flags & IFF_MULTICAST) == 0)
728 return EOPNOTSUPP;
729
730 /* Enable promiscuous reception of all IP multicasts from the if */
731 s = splnet();
732 error = if_allmulti(ifp, 1);
733 splx(s);
734 if (error)
735 return error;
736 }
737
738 s = splnet();
739 /* define parameters for the tbf structure */
740 vifp->v_tbf = v_tbf;
741 GET_TIME(vifp->v_tbf->tbf_last_pkt_t);
742 vifp->v_tbf->tbf_n_tok = 0;
743 vifp->v_tbf->tbf_q_len = 0;
744 vifp->v_tbf->tbf_max_q_len = MAXQSIZE;
745 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL;
746
747 vifp->v_flags = vifcp->vifc_flags;
748 vifp->v_threshold = vifcp->vifc_threshold;
749 vifp->v_lcl_addr = vifcp->vifc_lcl_addr;
750 vifp->v_rmt_addr = vifcp->vifc_rmt_addr;
751 vifp->v_ifp = ifp;
752 /* scaling up here allows division by 1024 in critical code */
753 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000;
754 vifp->v_rsvp_on = 0;
755 vifp->v_rsvpd = NULL;
756 /* initialize per vif pkt counters */
757 vifp->v_pkt_in = 0;
758 vifp->v_pkt_out = 0;
759 vifp->v_bytes_in = 0;
760 vifp->v_bytes_out = 0;
761 splx(s);
762
763 /* Adjust numvifs up if the vifi is higher than numvifs */
764 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1;
765
766 if (mrtdebug)
767 log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n",
768 vifcp->vifc_vifi,
769 (u_long)ntohl(vifcp->vifc_lcl_addr.s_addr),
770 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask",
771 (u_long)ntohl(vifcp->vifc_rmt_addr.s_addr),
772 vifcp->vifc_threshold,
773 vifcp->vifc_rate_limit);
774
775 return 0;
776}
777
778/*
779 * Delete a vif from the vif table
780 */
781static int
782del_vif(vifi)
783 vifi_t vifi;
784{
785 register struct vif *vifp = &viftable[vifi];
786 register struct mbuf *m;
787 struct ifnet *ifp;
788 struct ifreq ifr;
789 int s;
790
791 if (vifi >= numvifs) return EINVAL;
792 if (vifp->v_lcl_addr.s_addr == 0) return EADDRNOTAVAIL;
793
794 s = splnet();
795
796 if (!(vifp->v_flags & VIFF_TUNNEL)) {
797 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET;
798 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY;
799 ifp = vifp->v_ifp;
800 if_allmulti(ifp, 0);
801 }
802
803 if (vifp == last_encap_vif) {
804 last_encap_vif = 0;
805 last_encap_src = 0;
806 }
807
808 /*
809 * Free packets queued at the interface
810 */
811 while (vifp->v_tbf->tbf_q) {
812 m = vifp->v_tbf->tbf_q;
813 vifp->v_tbf->tbf_q = m->m_act;
814 m_freem(m);
815 }
816
817 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf)));
818 bzero((caddr_t)vifp, sizeof (*vifp));
819
820 if (mrtdebug)
821 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs);
822
823 /* Adjust numvifs down */
824 for (vifi = numvifs; vifi > 0; vifi--)
825 if (viftable[vifi-1].v_lcl_addr.s_addr != 0) break;
826 numvifs = vifi;
827
828 splx(s);
829
830 return 0;
831}
832
833/*
834 * Add an mfc entry
835 */
836static int
837add_mfc(mfccp)
838 struct mfcctl *mfccp;
839{
840 struct mfc *rt;
841 u_long hash;
842 struct rtdetq *rte;
843 register u_short nstl;
844 int s;
845 int i;
846
847 MFCFIND(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr, rt);
848
849 /* If an entry already exists, just update the fields */
850 if (rt) {
851 if (mrtdebug & DEBUG_MFC)
852 log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n",
853 (u_long)ntohl(mfccp->mfcc_origin.s_addr),
854 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
855 mfccp->mfcc_parent);
856
857 s = splnet();
858 rt->mfc_parent = mfccp->mfcc_parent;
859 for (i = 0; i < numvifs; i++)
860 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
861 splx(s);
862 return 0;
863 }
864
865 /*
866 * Find the entry for which the upcall was made and update
867 */
868 s = splnet();
869 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr);
870 for (rt = mfctable[hash], nstl = 0; rt; rt = rt->mfc_next) {
871
872 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) &&
873 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) &&
874 (rt->mfc_stall != NULL)) {
875
876 if (nstl++)
877 log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n",
878 "multiple kernel entries",
879 (u_long)ntohl(mfccp->mfcc_origin.s_addr),
880 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
881 mfccp->mfcc_parent, (void *)rt->mfc_stall);
882
883 if (mrtdebug & DEBUG_MFC)
884 log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n",
885 (u_long)ntohl(mfccp->mfcc_origin.s_addr),
886 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
887 mfccp->mfcc_parent, (void *)rt->mfc_stall);
888
889 rt->mfc_origin = mfccp->mfcc_origin;
890 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
891 rt->mfc_parent = mfccp->mfcc_parent;
892 for (i = 0; i < numvifs; i++)
893 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
894 /* initialize pkt counters per src-grp */
895 rt->mfc_pkt_cnt = 0;
896 rt->mfc_byte_cnt = 0;
897 rt->mfc_wrong_if = 0;
898 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
899
900 rt->mfc_expire = 0; /* Don't clean this guy up */
901 nexpire[hash]--;
902
903 /* free packets Qed at the end of this entry */
904 for (rte = rt->mfc_stall; rte != NULL; ) {
905 struct rtdetq *n = rte->next;
906
907 ip_mdq(rte->m, rte->ifp, rt, -1);
908 m_freem(rte->m);
909#ifdef UPCALL_TIMING
910 collate(&(rte->t));
911#endif /* UPCALL_TIMING */
912 free(rte, M_MRTABLE);
913 rte = n;
914 }
915 rt->mfc_stall = NULL;
916 }
917 }
918
919 /*
920 * It is possible that an entry is being inserted without an upcall
921 */
922 if (nstl == 0) {
923 if (mrtdebug & DEBUG_MFC)
924 log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n",
925 hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr),
926 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
927 mfccp->mfcc_parent);
928
929 for (rt = mfctable[hash]; rt != NULL; rt = rt->mfc_next) {
930
931 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) &&
932 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) {
933
934 rt->mfc_origin = mfccp->mfcc_origin;
935 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
936 rt->mfc_parent = mfccp->mfcc_parent;
937 for (i = 0; i < numvifs; i++)
938 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
939 /* initialize pkt counters per src-grp */
940 rt->mfc_pkt_cnt = 0;
941 rt->mfc_byte_cnt = 0;
942 rt->mfc_wrong_if = 0;
943 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
944 if (rt->mfc_expire)
945 nexpire[hash]--;
946 rt->mfc_expire = 0;
947 }
948 }
949 if (rt == NULL) {
950 /* no upcall, so make a new entry */
951 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
952 if (rt == NULL) {
953 splx(s);
954 return ENOBUFS;
955 }
956
957 /* insert new entry at head of hash chain */
958 rt->mfc_origin = mfccp->mfcc_origin;
959 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
960 rt->mfc_parent = mfccp->mfcc_parent;
961 for (i = 0; i < numvifs; i++)
962 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
963 /* initialize pkt counters per src-grp */
964 rt->mfc_pkt_cnt = 0;
965 rt->mfc_byte_cnt = 0;
966 rt->mfc_wrong_if = 0;
967 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
968 rt->mfc_expire = 0;
969 rt->mfc_stall = NULL;
970
971 /* link into table */
972 rt->mfc_next = mfctable[hash];
973 mfctable[hash] = rt;
974 }
975 }
976 splx(s);
977 return 0;
978}
979
980#ifdef UPCALL_TIMING
981/*
982 * collect delay statistics on the upcalls
983 */
984static void collate(t)
985register struct timeval *t;
986{
987 register u_long d;
988 register struct timeval tp;
989 register u_long delta;
990
991 GET_TIME(tp);
992
993 if (TV_LT(*t, tp))
994 {
995 TV_DELTA(tp, *t, delta);
996
997 d = delta >> 10;
998 if (d > 50)
999 d = 50;
1000
1001 ++upcall_data[d];
1002 }
1003}
1004#endif /* UPCALL_TIMING */
1005
1006/*
1007 * Delete an mfc entry
1008 */
1009static int
1010del_mfc(mfccp)
1011 struct mfcctl *mfccp;
1012{
1013 struct in_addr origin;
1014 struct in_addr mcastgrp;
1015 struct mfc *rt;
1016 struct mfc **nptr;
1017 u_long hash;
1018 int s;
1019
1020 origin = mfccp->mfcc_origin;
1021 mcastgrp = mfccp->mfcc_mcastgrp;
1022 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr);
1023
1024 if (mrtdebug & DEBUG_MFC)
1025 log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n",
1026 (u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr));
1027
1028 s = splnet();
1029
1030 nptr = &mfctable[hash];
1031 while ((rt = *nptr) != NULL) {
1032 if (origin.s_addr == rt->mfc_origin.s_addr &&
1033 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr &&
1034 rt->mfc_stall == NULL)
1035 break;
1036
1037 nptr = &rt->mfc_next;
1038 }
1039 if (rt == NULL) {
1040 splx(s);
1041 return EADDRNOTAVAIL;
1042 }
1043
1044 *nptr = rt->mfc_next;
1045 free(rt, M_MRTABLE);
1046
1047 splx(s);
1048
1049 return 0;
1050}
1051
1052/*
1053 * Send a message to mrouted on the multicast routing socket
1054 */
1055static int
1056socket_send(s, mm, src)
1057 struct socket *s;
1058 struct mbuf *mm;
1059 struct sockaddr_in *src;
1060{
1061 if (s) {
1062 if (sbappendaddr(&s->so_rcv,
1063 (struct sockaddr *)src,
1064 mm, (struct mbuf *)0) != 0) {
1065 sorwakeup(s);
1066 return 0;
1067 }
1068 }
1069 m_freem(mm);
1070 return -1;
1071}
1072
1073/*
1074 * IP multicast forwarding function. This function assumes that the packet
1075 * pointed to by "ip" has arrived on (or is about to be sent to) the interface
1076 * pointed to by "ifp", and the packet is to be relayed to other networks
1077 * that have members of the packet's destination IP multicast group.
1078 *
1079 * The packet is returned unscathed to the caller, unless it is
1080 * erroneous, in which case a non-zero return value tells the caller to
1081 * discard it.
1082 */
1083
1084#define IP_HDR_LEN 20 /* # bytes of fixed IP header (excluding options) */
1085#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */
1086
1087static int
1088X_ip_mforward(ip, ifp, m, imo)
1089 register struct ip *ip;
1090 struct ifnet *ifp;
1091 struct mbuf *m;
1092 struct ip_moptions *imo;
1093{
1094 register struct mfc *rt;
1095 register u_char *ipoptions;
1096 static struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
1097 static int srctun = 0;
1098 register struct mbuf *mm;
1099 int s;
1100 vifi_t vifi;
1101 struct vif *vifp;
1102
1103 if (mrtdebug & DEBUG_FORWARD)
1104 log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n",
1105 (u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr),
1106 (void *)ifp);
1107
1108 if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 ||
1109 (ipoptions = (u_char *)(ip + 1))[1] != IPOPT_LSRR ) {
1110 /*
1111 * Packet arrived via a physical interface or
1112 * an encapsulated tunnel.
1113 */
1114 } else {
1115 /*
1116 * Packet arrived through a source-route tunnel.
1117 * Source-route tunnels are no longer supported.
1118 */
1119 if ((srctun++ % 1000) == 0)
1120 log(LOG_ERR,
1121 "ip_mforward: received source-routed packet from %lx\n",
1122 (u_long)ntohl(ip->ip_src.s_addr));
1123
1124 return 1;
1125 }
1126
1127 if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) {
1128 if (ip->ip_ttl < 255)
1129 ip->ip_ttl++; /* compensate for -1 in *_send routines */
1130 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) {
1131 vifp = viftable + vifi;
1132 printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s%d)\n",
1133 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), vifi,
1134 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "",
1135 vifp->v_ifp->if_name, vifp->v_ifp->if_unit);
1136 }
1137 return (ip_mdq(m, ifp, NULL, vifi));
1138 }
1139 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) {
1140 printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n",
1141 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr));
1142 if(!imo)
1143 printf("In fact, no options were specified at all\n");
1144 }
1145
1146 /*
1147 * Don't forward a packet with time-to-live of zero or one,
1148 * or a packet destined to a local-only group.
1149 */
1150 if (ip->ip_ttl <= 1 ||
1151 ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP)
1152 return 0;
1153
1154 /*
1155 * Determine forwarding vifs from the forwarding cache table
1156 */
1157 s = splnet();
1158 MFCFIND(ip->ip_src.s_addr, ip->ip_dst.s_addr, rt);
1159
1160 /* Entry exists, so forward if necessary */
1161 if (rt != NULL) {
1162 splx(s);
1163 return (ip_mdq(m, ifp, rt, -1));
1164 } else {
1165 /*
1166 * If we don't have a route for packet's origin,
1167 * Make a copy of the packet &
1168 * send message to routing daemon
1169 */
1170
1171 register struct mbuf *mb0;
1172 register struct rtdetq *rte;
1173 register u_long hash;
1174 int hlen = ip->ip_hl << 2;
1175#ifdef UPCALL_TIMING
1176 struct timeval tp;
1177
1178 GET_TIME(tp);
1179#endif
1180
1181 mrtstat.mrts_no_route++;
1182 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC))
1183 log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n",
1184 (u_long)ntohl(ip->ip_src.s_addr),
1185 (u_long)ntohl(ip->ip_dst.s_addr));
1186
1187 /*
1188 * Allocate mbufs early so that we don't do extra work if we are
1189 * just going to fail anyway. Make sure to pullup the header so
1190 * that other people can't step on it.
1191 */
1192 rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, M_NOWAIT);
1193 if (rte == NULL) {
1194 splx(s);
1195 return ENOBUFS;
1196 }
1197 mb0 = m_copy(m, 0, M_COPYALL);
1198 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen))
1199 mb0 = m_pullup(mb0, hlen);
1200 if (mb0 == NULL) {
1201 free(rte, M_MRTABLE);
1202 splx(s);
1203 return ENOBUFS;
1204 }
1205
1206 /* is there an upcall waiting for this packet? */
1207 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr);
1208 for (rt = mfctable[hash]; rt; rt = rt->mfc_next) {
1209 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) &&
1210 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) &&
1211 (rt->mfc_stall != NULL))
1212 break;
1213 }
1214
1215 if (rt == NULL) {
1216 int i;
1217 struct igmpmsg *im;
1218
1219 /* no upcall, so make a new entry */
1220 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
1221 if (rt == NULL) {
1222 free(rte, M_MRTABLE);
1223 m_freem(mb0);
1224 splx(s);
1225 return ENOBUFS;
1226 }
1227 /* Make a copy of the header to send to the user level process */
1228 mm = m_copy(mb0, 0, hlen);
1229 if (mm == NULL) {
1230 free(rte, M_MRTABLE);
1231 m_freem(mb0);
1232 free(rt, M_MRTABLE);
1233 splx(s);
1234 return ENOBUFS;
1235 }
1236
1237 /*
1238 * Send message to routing daemon to install
1239 * a route into the kernel table
1240 */
1241 k_igmpsrc.sin_addr = ip->ip_src;
1242
1243 im = mtod(mm, struct igmpmsg *);
1244 im->im_msgtype = IGMPMSG_NOCACHE;
1245 im->im_mbz = 0;
1246
1247 mrtstat.mrts_upcalls++;
1248
1249 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) {
1250 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n");
1251 ++mrtstat.mrts_upq_sockfull;
1252 free(rte, M_MRTABLE);
1253 m_freem(mb0);
1254 free(rt, M_MRTABLE);
1255 splx(s);
1256 return ENOBUFS;
1257 }
1258
1259 /* insert new entry at head of hash chain */
1260 rt->mfc_origin.s_addr = ip->ip_src.s_addr;
1261 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr;
1262 rt->mfc_expire = UPCALL_EXPIRE;
1263 nexpire[hash]++;
1264 for (i = 0; i < numvifs; i++)
1265 rt->mfc_ttls[i] = 0;
1266 rt->mfc_parent = -1;
1267
1268 /* link into table */
1269 rt->mfc_next = mfctable[hash];
1270 mfctable[hash] = rt;
1271 rt->mfc_stall = rte;
1272
1273 } else {
1274 /* determine if q has overflowed */
1275 int npkts = 0;
1276 struct rtdetq **p;
1277
1278 for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next)
1279 npkts++;
1280
1281 if (npkts > MAX_UPQ) {
1282 mrtstat.mrts_upq_ovflw++;
1283 free(rte, M_MRTABLE);
1284 m_freem(mb0);
1285 splx(s);
1286 return 0;
1287 }
1288
1289 /* Add this entry to the end of the queue */
1290 *p = rte;
1291 }
1292
1293 rte->m = mb0;
1294 rte->ifp = ifp;
1295#ifdef UPCALL_TIMING
1296 rte->t = tp;
1297#endif
1298 rte->next = NULL;
1299
1300 splx(s);
1301
1302 return 0;
1303 }
1304}
1305
1306#ifndef MROUTE_LKM
1307int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
1308 struct ip_moptions *) = X_ip_mforward;
1309#endif
1310
1311/*
1312 * Clean up the cache entry if upcall is not serviced
1313 */
1314static void
1315expire_upcalls(void *unused)
1316{
1317 struct rtdetq *rte;
1318 struct mfc *mfc, **nptr;
1319 int i;
1320 int s;
1321
1322 s = splnet();
1323 for (i = 0; i < MFCTBLSIZ; i++) {
1324 if (nexpire[i] == 0)
1325 continue;
1326 nptr = &mfctable[i];
1327 for (mfc = *nptr; mfc != NULL; mfc = *nptr) {
1328 /*
1329 * Skip real cache entries
1330 * Make sure it wasn't marked to not expire (shouldn't happen)
1331 * If it expires now
1332 */
1333 if (mfc->mfc_stall != NULL &&
1334 mfc->mfc_expire != 0 &&
1335 --mfc->mfc_expire == 0) {
1336 if (mrtdebug & DEBUG_EXPIRE)
1337 log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n",
1338 (u_long)ntohl(mfc->mfc_origin.s_addr),
1339 (u_long)ntohl(mfc->mfc_mcastgrp.s_addr));
1340 /*
1341 * drop all the packets
1342 * free the mbuf with the pkt, if, timing info
1343 */
1344 for (rte = mfc->mfc_stall; rte; ) {
1345 struct rtdetq *n = rte->next;
1346
1347 m_freem(rte->m);
1348 free(rte, M_MRTABLE);
1349 rte = n;
1350 }
1351 ++mrtstat.mrts_cache_cleanups;
1352 nexpire[i]--;
1353
1354 *nptr = mfc->mfc_next;
1355 free(mfc, M_MRTABLE);
1356 } else {
1357 nptr = &mfc->mfc_next;
1358 }
1359 }
1360 }
1361 splx(s);
1362 expire_upcalls_ch = timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
1363}
1364
1365/*
1366 * Packet forwarding routine once entry in the cache is made
1367 */
1368static int
1369ip_mdq(m, ifp, rt, xmt_vif)
1370 register struct mbuf *m;
1371 register struct ifnet *ifp;
1372 register struct mfc *rt;
1373 register vifi_t xmt_vif;
1374{
1375 register struct ip *ip = mtod(m, struct ip *);
1376 register vifi_t vifi;
1377 register struct vif *vifp;
1378 register int plen = ip->ip_len;
1379
1380/*
1381 * Macro to send packet on vif. Since RSVP packets don't get counted on
1382 * input, they shouldn't get counted on output, so statistics keeping is
1383 * seperate.
1384 */
1385#define MC_SEND(ip,vifp,m) { \
1386 if ((vifp)->v_flags & VIFF_TUNNEL) \
1387 encap_send((ip), (vifp), (m)); \
1388 else \
1389 phyint_send((ip), (vifp), (m)); \
1390}
1391
1392 /*
1393 * If xmt_vif is not -1, send on only the requested vif.
1394 *
1395 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.)
1396 */
1397 if (xmt_vif < numvifs) {
1398 MC_SEND(ip, viftable + xmt_vif, m);
1399 return 1;
1400 }
1401
1402 /*
1403 * Don't forward if it didn't arrive from the parent vif for its origin.
1404 */
1405 vifi = rt->mfc_parent;
1406 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) {
1407 /* came in the wrong interface */
1408 if (mrtdebug & DEBUG_FORWARD)
1409 log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n",
1410 (void *)ifp, vifi, (void *)viftable[vifi].v_ifp);
1411 ++mrtstat.mrts_wrong_if;
1412 ++rt->mfc_wrong_if;
1413 /*
1414 * If we are doing PIM assert processing, and we are forwarding
1415 * packets on this interface, and it is a broadcast medium
1416 * interface (and not a tunnel), send a message to the routing daemon.
1417 */
1418 if (pim_assert && rt->mfc_ttls[vifi] &&
1419 (ifp->if_flags & IFF_BROADCAST) &&
1420 !(viftable[vifi].v_flags & VIFF_TUNNEL)) {
1421 struct sockaddr_in k_igmpsrc;
1422 struct mbuf *mm;
1423 struct igmpmsg *im;
1424 int hlen = ip->ip_hl << 2;
1425 struct timeval now;
1426 register u_long delta;
1427
1428 GET_TIME(now);
1429
1430 TV_DELTA(rt->mfc_last_assert, now, delta);
1431
1432 if (delta > ASSERT_MSG_TIME) {
1433 mm = m_copy(m, 0, hlen);
1434 if (mm && (M_HASCL(mm) || mm->m_len < hlen))
1435 mm = m_pullup(mm, hlen);
1436 if (mm == NULL) {
1437 return ENOBUFS;
1438 }
1439
1440 rt->mfc_last_assert = now;
1441
1442 im = mtod(mm, struct igmpmsg *);
1443 im->im_msgtype = IGMPMSG_WRONGVIF;
1444 im->im_mbz = 0;
1445 im->im_vif = vifi;
1446
1447 k_igmpsrc.sin_addr = im->im_src;
1448
1449 socket_send(ip_mrouter, mm, &k_igmpsrc);
1450 }
1451 }
1452 return 0;
1453 }
1454
1455 /* If I sourced this packet, it counts as output, else it was input. */
1456 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) {
1457 viftable[vifi].v_pkt_out++;
1458 viftable[vifi].v_bytes_out += plen;
1459 } else {
1460 viftable[vifi].v_pkt_in++;
1461 viftable[vifi].v_bytes_in += plen;
1462 }
1463 rt->mfc_pkt_cnt++;
1464 rt->mfc_byte_cnt += plen;
1465
1466 /*
1467 * For each vif, decide if a copy of the packet should be forwarded.
1468 * Forward if:
1469 * - the ttl exceeds the vif's threshold
1470 * - there are group members downstream on interface
1471 */
1472 for (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++)
1473 if ((rt->mfc_ttls[vifi] > 0) &&
1474 (ip->ip_ttl > rt->mfc_ttls[vifi])) {
1475 vifp->v_pkt_out++;
1476 vifp->v_bytes_out += plen;
1477 MC_SEND(ip, vifp, m);
1478 }
1479
1480 return 0;
1481}
1482
1483/*
1484 * check if a vif number is legal/ok. This is used by ip_output, to export
1485 * numvifs there,
1486 */
1487static int
1488X_legal_vif_num(vif)
1489 int vif;
1490{
1491 if (vif >= 0 && vif < numvifs)
1492 return(1);
1493 else
1494 return(0);
1495}
1496
1497#ifndef MROUTE_LKM
1498int (*legal_vif_num)(int) = X_legal_vif_num;
1499#endif
1500
1501/*
1502 * Return the local address used by this vif
1503 */
1504static u_long
1505X_ip_mcast_src(vifi)
1506 int vifi;
1507{
1508 if (vifi >= 0 && vifi < numvifs)
1509 return viftable[vifi].v_lcl_addr.s_addr;
1510 else
1511 return INADDR_ANY;
1512}
1513
1514#ifndef MROUTE_LKM
1515u_long (*ip_mcast_src)(int) = X_ip_mcast_src;
1516#endif
1517
1518static void
1519phyint_send(ip, vifp, m)
1520 struct ip *ip;
1521 struct vif *vifp;
1522 struct mbuf *m;
1523{
1524 register struct mbuf *mb_copy;
1525 register int hlen = ip->ip_hl << 2;
1526
1527 /*
1528 * Make a new reference to the packet; make sure that
1529 * the IP header is actually copied, not just referenced,
1530 * so that ip_output() only scribbles on the copy.
1531 */
1532 mb_copy = m_copy(m, 0, M_COPYALL);
1533 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen))
1534 mb_copy = m_pullup(mb_copy, hlen);
1535 if (mb_copy == NULL)
1536 return;
1537
1538 if (vifp->v_rate_limit == 0)
1539 tbf_send_packet(vifp, mb_copy);
1540 else
1541 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len);
1542}
1543
1544static void
1545encap_send(ip, vifp, m)
1546 register struct ip *ip;
1547 register struct vif *vifp;
1548 register struct mbuf *m;
1549{
1550 register struct mbuf *mb_copy;
1551 register struct ip *ip_copy;
1552 register int i, len = ip->ip_len;
1553
1554 /*
1555 * copy the old packet & pullup its IP header into the
1556 * new mbuf so we can modify it. Try to fill the new
1557 * mbuf since if we don't the ethernet driver will.
1558 */
1559 MGETHDR(mb_copy, M_DONTWAIT, MT_HEADER);
1560 if (mb_copy == NULL)
1561 return;
1562 mb_copy->m_data += max_linkhdr;
1563 mb_copy->m_len = sizeof(multicast_encap_iphdr);
1564
1565 if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1566 m_freem(mb_copy);
1567 return;
1568 }
1569 i = MHLEN - M_LEADINGSPACE(mb_copy);
1570 if (i > len)
1571 i = len;
1572 mb_copy = m_pullup(mb_copy, i);
1573 if (mb_copy == NULL)
1574 return;
1575 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr);
1576
1577 /*
1578 * fill in the encapsulating IP header.
1579 */
1580 ip_copy = mtod(mb_copy, struct ip *);
1581 *ip_copy = multicast_encap_iphdr;
1582 ip_copy->ip_id = htons(ip_id++);
1583 ip_copy->ip_len += len;
1584 ip_copy->ip_src = vifp->v_lcl_addr;
1585 ip_copy->ip_dst = vifp->v_rmt_addr;
1586
1587 /*
1588 * turn the encapsulated IP header back into a valid one.
1589 */
1590 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr));
1591 --ip->ip_ttl;
1592 HTONS(ip->ip_len);
1593 HTONS(ip->ip_off);
1594 ip->ip_sum = 0;
1595 mb_copy->m_data += sizeof(multicast_encap_iphdr);
1596 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2);
1597 mb_copy->m_data -= sizeof(multicast_encap_iphdr);
1598
1599 if (vifp->v_rate_limit == 0)
1600 tbf_send_packet(vifp, mb_copy);
1601 else
1602 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len);
1603}
1604
1605/*
1606 * De-encapsulate a packet and feed it back through ip input (this
1607 * routine is called whenever IP gets a packet with proto type
1608 * ENCAP_PROTO and a local destination address).
1609 */
1610void
1611#ifdef MROUTE_LKM
1612X_ipip_input(m, iphlen)
1613#else
1614ipip_input(m, iphlen)
1615#endif
1616 register struct mbuf *m;
1617 int iphlen;
1618{
1619 struct ifnet *ifp = m->m_pkthdr.rcvif;
1620 register struct ip *ip = mtod(m, struct ip *);
1621 register int hlen = ip->ip_hl << 2;
1622 register int s;
1623 register struct ifqueue *ifq;
1624 register struct vif *vifp;
1625
1626 if (!have_encap_tunnel) {
1627 rip_input(m, iphlen);
1628 return;
1629 }
1630 /*
1631 * dump the packet if it's not to a multicast destination or if
1632 * we don't have an encapsulating tunnel with the source.
1633 * Note: This code assumes that the remote site IP address
1634 * uniquely identifies the tunnel (i.e., that this site has
1635 * at most one tunnel with the remote site).
1636 */
1637 if (! IN_MULTICAST(ntohl(((struct ip *)((char *)ip + hlen))->ip_dst.s_addr))) {
1638 ++mrtstat.mrts_bad_tunnel;
1639 m_freem(m);
1640 return;
1641 }
1642 if (ip->ip_src.s_addr != last_encap_src) {
1643 register struct vif *vife;
1644
1645 vifp = viftable;
1646 vife = vifp + numvifs;
1647 last_encap_src = ip->ip_src.s_addr;
1648 last_encap_vif = 0;
1649 for ( ; vifp < vife; ++vifp)
1650 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) {
1651 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT))
1652 == VIFF_TUNNEL)
1653 last_encap_vif = vifp;
1654 break;
1655 }
1656 }
1657 if ((vifp = last_encap_vif) == 0) {
1658 last_encap_src = 0;
1659 mrtstat.mrts_cant_tunnel++; /*XXX*/
1660 m_freem(m);
1661 if (mrtdebug)
1662 log(LOG_DEBUG, "ip_mforward: no tunnel with %lx\n",
1663 (u_long)ntohl(ip->ip_src.s_addr));
1664 return;
1665 }
1666 ifp = vifp->v_ifp;
1667
1668 if (hlen > IP_HDR_LEN)
1669 ip_stripoptions(m, (struct mbuf *) 0);
1670 m->m_data += IP_HDR_LEN;
1671 m->m_len -= IP_HDR_LEN;
1672 m->m_pkthdr.len -= IP_HDR_LEN;
1673 m->m_pkthdr.rcvif = ifp;
1674
1675 ifq = &ipintrq;
1676 s = splimp();
1677 if (IF_QFULL(ifq)) {
1678 IF_DROP(ifq);
1679 m_freem(m);
1680 } else {
1681 IF_ENQUEUE(ifq, m);
1682 /*
1683 * normally we would need a "schednetisr(NETISR_IP)"
1684 * here but we were called by ip_input and it is going
1685 * to loop back & try to dequeue the packet we just
1686 * queued as soon as we return so we avoid the
1687 * unnecessary software interrrupt.
1688 */
1689 }
1690 splx(s);
1691}
1692
1693/*
1694 * Token bucket filter module
1695 */
1696
1697static void
1698tbf_control(vifp, m, ip, p_len)
1699 register struct vif *vifp;
1700 register struct mbuf *m;
1701 register struct ip *ip;
1702 register u_long p_len;
1703{
1704 register struct tbf *t = vifp->v_tbf;
1705
1706 if (p_len > MAX_BKT_SIZE) {
1707 /* drop if packet is too large */
1708 mrtstat.mrts_pkt2large++;
1709 m_freem(m);
1710 return;
1711 }
1712
1713 tbf_update_tokens(vifp);
1714
1715 /* if there are enough tokens,
1716 * and the queue is empty,
1717 * send this packet out
1718 */
1719
1720 if (t->tbf_q_len == 0) {
1721 /* queue empty, send packet if enough tokens */
1722 if (p_len <= t->tbf_n_tok) {
1723 t->tbf_n_tok -= p_len;
1724 tbf_send_packet(vifp, m);
1725 } else {
1726 /* queue packet and timeout till later */
1727 tbf_queue(vifp, m);
1728 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS);
1729 }
1730 } else if (t->tbf_q_len < t->tbf_max_q_len) {
1731 /* finite queue length, so queue pkts and process queue */
1732 tbf_queue(vifp, m);
1733 tbf_process_q(vifp);
1734 } else {
1735 /* queue length too much, try to dq and queue and process */
1736 if (!tbf_dq_sel(vifp, ip)) {
1737 mrtstat.mrts_q_overflow++;
1738 m_freem(m);
1739 return;
1740 } else {
1741 tbf_queue(vifp, m);
1742 tbf_process_q(vifp);
1743 }
1744 }
1745 return;
1746}
1747
1748/*
1749 * adds a packet to the queue at the interface
1750 */
1751static void
1752tbf_queue(vifp, m)
1753 register struct vif *vifp;
1754 register struct mbuf *m;
1755{
1756 register int s = splnet();
1757 register struct tbf *t = vifp->v_tbf;
1758
1759 if (t->tbf_t == NULL) {
1760 /* Queue was empty */
1761 t->tbf_q = m;
1762 } else {
1763 /* Insert at tail */
1764 t->tbf_t->m_act = m;
1765 }
1766
1767 /* Set new tail pointer */
1768 t->tbf_t = m;
1769
1770#ifdef DIAGNOSTIC
1771 /* Make sure we didn't get fed a bogus mbuf */
1772 if (m->m_act)
1773 panic("tbf_queue: m_act");
1774#endif
1775 m->m_act = NULL;
1776
1777 t->tbf_q_len++;
1778
1779 splx(s);
1780}
1781
1782
1783/*
1784 * processes the queue at the interface
1785 */
1786static void
1787tbf_process_q(vifp)
1788 register struct vif *vifp;
1789{
1790 register struct mbuf *m;
1791 register int len;
1792 register int s = splnet();
1793 register struct tbf *t = vifp->v_tbf;
1794
1795 /* loop through the queue at the interface and send as many packets
1796 * as possible
1797 */
1798 while (t->tbf_q_len > 0) {
1799 m = t->tbf_q;
1800
1801 len = mtod(m, struct ip *)->ip_len;
1802
1803 /* determine if the packet can be sent */
1804 if (len <= t->tbf_n_tok) {
1805 /* if so,
1806 * reduce no of tokens, dequeue the packet,
1807 * send the packet.
1808 */
1809 t->tbf_n_tok -= len;
1810
1811 t->tbf_q = m->m_act;
1812 if (--t->tbf_q_len == 0)
1813 t->tbf_t = NULL;
1814
1815 m->m_act = NULL;
1816 tbf_send_packet(vifp, m);
1817
1818 } else break;
1819 }
1820 splx(s);
1821}
1822
1823static void
1824tbf_reprocess_q(xvifp)
1825 void *xvifp;
1826{
1827 register struct vif *vifp = xvifp;
1828 if (ip_mrouter == NULL)
1829 return;
1830
1831 tbf_update_tokens(vifp);
1832
1833 tbf_process_q(vifp);
1834
1835 if (vifp->v_tbf->tbf_q_len)
1836 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS);
1837}
1838
1839/* function that will selectively discard a member of the queue
1840 * based on the precedence value and the priority
1841 */
1842static int
1843tbf_dq_sel(vifp, ip)
1844 register struct vif *vifp;
1845 register struct ip *ip;
1846{
1847 register int s = splnet();
1848 register u_int p;
1849 register struct mbuf *m, *last;
1850 register struct mbuf **np;
1851 register struct tbf *t = vifp->v_tbf;
1852
1853 p = priority(vifp, ip);
1854
1855 np = &t->tbf_q;
1856 last = NULL;
1857 while ((m = *np) != NULL) {
1858 if (p > priority(vifp, mtod(m, struct ip *))) {
1859 *np = m->m_act;
1860 /* If we're removing the last packet, fix the tail pointer */
1861 if (m == t->tbf_t)
1862 t->tbf_t = last;
1863 m_freem(m);
1864 /* it's impossible for the queue to be empty, but
1865 * we check anyway. */
1866 if (--t->tbf_q_len == 0)
1867 t->tbf_t = NULL;
1868 splx(s);
1869 mrtstat.mrts_drop_sel++;
1870 return(1);
1871 }
1872 np = &m->m_act;
1873 last = m;
1874 }
1875 splx(s);
1876 return(0);
1877}
1878
1879static void
1880tbf_send_packet(vifp, m)
1881 register struct vif *vifp;
1882 register struct mbuf *m;
1883{
1884 struct ip_moptions imo;
1885 int error;
1886 static struct route ro;
1887 int s = splnet();
1888
1889 if (vifp->v_flags & VIFF_TUNNEL) {
1890 /* If tunnel options */
1891 ip_output(m, (struct mbuf *)0, &vifp->v_route,
1892 IP_FORWARDING, (struct ip_moptions *)0);
1893 } else {
1894 imo.imo_multicast_ifp = vifp->v_ifp;
1895 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1;
1896 imo.imo_multicast_loop = 1;
1897 imo.imo_multicast_vif = -1;
1898
1899 /*
1900 * Re-entrancy should not be a problem here, because
1901 * the packets that we send out and are looped back at us
1902 * should get rejected because they appear to come from
1903 * the loopback interface, thus preventing looping.
1904 */
1905 error = ip_output(m, (struct mbuf *)0, &ro,
1906 IP_FORWARDING, &imo);
1907
1908 if (mrtdebug & DEBUG_XMIT)
1909 log(LOG_DEBUG, "phyint_send on vif %d err %d\n",
1910 vifp - viftable, error);
1911 }
1912 splx(s);
1913}
1914
1915/* determine the current time and then
1916 * the elapsed time (between the last time and time now)
1917 * in milliseconds & update the no. of tokens in the bucket
1918 */
1919static void
1920tbf_update_tokens(vifp)
1921 register struct vif *vifp;
1922{
1923 struct timeval tp;
1924 register u_long tm;
1925 register int s = splnet();
1926 register struct tbf *t = vifp->v_tbf;
1927
1928 GET_TIME(tp);
1929
1930 TV_DELTA(tp, t->tbf_last_pkt_t, tm);
1931
1932 /*
1933 * This formula is actually
1934 * "time in seconds" * "bytes/second".
1935 *
1936 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8)
1937 *
1938 * The (1000/1024) was introduced in add_vif to optimize
1939 * this divide into a shift.
1940 */
1941 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8;
1942 t->tbf_last_pkt_t = tp;
1943
1944 if (t->tbf_n_tok > MAX_BKT_SIZE)
1945 t->tbf_n_tok = MAX_BKT_SIZE;
1946
1947 splx(s);
1948}
1949
1950static int
1951priority(vifp, ip)
1952 register struct vif *vifp;
1953 register struct ip *ip;
1954{
1955 register int prio;
1956
1957 /* temporary hack; may add general packet classifier some day */
1958
1959 /*
1960 * The UDP port space is divided up into four priority ranges:
1961 * [0, 16384) : unclassified - lowest priority
1962 * [16384, 32768) : audio - highest priority
1963 * [32768, 49152) : whiteboard - medium priority
1964 * [49152, 65536) : video - low priority
1965 */
1966 if (ip->ip_p == IPPROTO_UDP) {
1967 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2));
1968 switch (ntohs(udp->uh_dport) & 0xc000) {
1969 case 0x4000:
1970 prio = 70;
1971 break;
1972 case 0x8000:
1973 prio = 60;
1974 break;
1975 case 0xc000:
1976 prio = 55;
1977 break;
1978 default:
1979 prio = 50;
1980 break;
1981 }
1982 if (tbfdebug > 1)
1983 log(LOG_DEBUG, "port %x prio%d\n", ntohs(udp->uh_dport), prio);
1984 } else {
1985 prio = 50;
1986 }
1987 return prio;
1988}
1989
1990/*
1991 * End of token bucket filter modifications
1992 */
1993
1994int
1995ip_rsvp_vif_init(so, sopt)
1996 struct socket *so;
1997 struct sockopt *sopt;
1998{
1999 int error, i, s;
2000
2001 if (rsvpdebug)
2002 printf("ip_rsvp_vif_init: so_type = %d, pr_protocol = %d\n",
2003 so->so_type, so->so_proto->pr_protocol);
2004
2005 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP)
2006 return EOPNOTSUPP;
2007
2008 /* Check mbuf. */
2009 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
2010 if (error)
2011 return (error);
2012
2013 if (rsvpdebug)
2014 printf("ip_rsvp_vif_init: vif = %d rsvp_on = %d\n", i, rsvp_on);
2015
2016 s = splnet();
2017
2018 /* Check vif. */
2019 if (!legal_vif_num(i)) {
2020 splx(s);
2021 return EADDRNOTAVAIL;
2022 }
2023
2024 /* Check if socket is available. */
2025 if (viftable[i].v_rsvpd != NULL) {
2026 splx(s);
2027 return EADDRINUSE;
2028 }
2029
2030 viftable[i].v_rsvpd = so;
2031 /* This may seem silly, but we need to be sure we don't over-increment
2032 * the RSVP counter, in case something slips up.
2033 */
2034 if (!viftable[i].v_rsvp_on) {
2035 viftable[i].v_rsvp_on = 1;
2036 rsvp_on++;
2037 }
2038
2039 splx(s);
2040 return 0;
2041}
2042
2043int
2044ip_rsvp_vif_done(so, sopt)
2045 struct socket *so;
2046 struct sockopt *sopt;
2047{
2048 int error, i, s;
2049
2050 if (rsvpdebug)
2051 printf("ip_rsvp_vif_done: so_type = %d, pr_protocol = %d\n",
2052 so->so_type, so->so_proto->pr_protocol);
2053
2054 if (so->so_type != SOCK_RAW ||
2055 so->so_proto->pr_protocol != IPPROTO_RSVP)
2056 return EOPNOTSUPP;
2057
2058 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
2059 if (error)
2060 return (error);
2061
2062 s = splnet();
2063
2064 /* Check vif. */
2065 if (!legal_vif_num(i)) {
2066 splx(s);
2067 return EADDRNOTAVAIL;
2068 }
2069
2070 if (rsvpdebug)
2071 printf("ip_rsvp_vif_done: v_rsvpd = %p so = %p\n",
2072 viftable[i].v_rsvpd, so);
2073
2074 viftable[i].v_rsvpd = NULL;
2075 /*
2076 * This may seem silly, but we need to be sure we don't over-decrement
2077 * the RSVP counter, in case something slips up.
2078 */
2079 if (viftable[i].v_rsvp_on) {
2080 viftable[i].v_rsvp_on = 0;
2081 rsvp_on--;
2082 }
2083
2084 splx(s);
2085 return 0;
2086}
2087
2088void
2089ip_rsvp_force_done(so)
2090 struct socket *so;
2091{
2092 int vifi;
2093 register int s;
2094
2095 /* Don't bother if it is not the right type of socket. */
2096 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP)
2097 return;
2098
2099 s = splnet();
2100
2101 /* The socket may be attached to more than one vif...this
2102 * is perfectly legal.
2103 */
2104 for (vifi = 0; vifi < numvifs; vifi++) {
2105 if (viftable[vifi].v_rsvpd == so) {
2106 viftable[vifi].v_rsvpd = NULL;
2107 /* This may seem silly, but we need to be sure we don't
2108 * over-decrement the RSVP counter, in case something slips up.
2109 */
2110 if (viftable[vifi].v_rsvp_on) {
2111 viftable[vifi].v_rsvp_on = 0;
2112 rsvp_on--;
2113 }
2114 }
2115 }
2116
2117 splx(s);
2118 return;
2119}
2120
2121void
2122rsvp_input(m, iphlen)
2123 struct mbuf *m;
2124 int iphlen;
2125{
2126 int vifi;
2127 register struct ip *ip = mtod(m, struct ip *);
2128 static struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET };
2129 register int s;
2130 struct ifnet *ifp;
2131
2132 if (rsvpdebug)
2133 printf("rsvp_input: rsvp_on %d\n",rsvp_on);
2134
2135 /* Can still get packets with rsvp_on = 0 if there is a local member
2136 * of the group to which the RSVP packet is addressed. But in this
2137 * case we want to throw the packet away.
2138 */
2139 if (!rsvp_on) {
2140 m_freem(m);
2141 return;
2142 }
2143
2144 /* If the old-style non-vif-associated socket is set, then use
2145 * it and ignore the new ones.
2146 */
2147 if (ip_rsvpd != NULL) {
2148 if (rsvpdebug)
2149 printf("rsvp_input: Sending packet up old-style socket\n");
2150 rip_input(m, iphlen);
2151 return;
2152 }
2153
2154 s = splnet();
2155
2156 if (rsvpdebug)
2157 printf("rsvp_input: check vifs\n");
2158
2159#ifdef DIAGNOSTIC
2160 if (!(m->m_flags & M_PKTHDR))
2161 panic("rsvp_input no hdr");
2162#endif
2163
2164 ifp = m->m_pkthdr.rcvif;
2165 /* Find which vif the packet arrived on. */
2166 for (vifi = 0; vifi < numvifs; vifi++) {
2167 if (viftable[vifi].v_ifp == ifp)
2168 break;
2169 }
2170
2171 if (vifi == numvifs) {
2172 /* Can't find vif packet arrived on. Drop packet. */
2173 if (rsvpdebug)
2174 printf("rsvp_input: Can't find vif for packet...dropping it.\n");
2175 m_freem(m);
2176 splx(s);
2177 return;
2178 }
2179
2180 if (rsvpdebug)
2181 printf("rsvp_input: check socket\n");
2182
2183 if (viftable[vifi].v_rsvpd == NULL) {
2184 /* drop packet, since there is no specific socket for this
2185 * interface */
2186 if (rsvpdebug)
2187 printf("rsvp_input: No socket defined for vif %d\n",vifi);
2188 m_freem(m);
2189 splx(s);
2190 return;
2191 }
2192 rsvp_src.sin_addr = ip->ip_src;
2193
2194 if (rsvpdebug && m)
2195 printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n",
2196 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv)));
2197
2198 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) {
2199 if (rsvpdebug)
2200 printf("rsvp_input: Failed to append to socket\n");
2201 } else {
2202 if (rsvpdebug)
2203 printf("rsvp_input: send packet up\n");
2204 }
2205
2206 splx(s);
2207}
2208
2209#ifdef MROUTE_LKM
2210#include <sys/conf.h>
2211#include <sys/exec.h>
2212#include <sys/sysent.h>
2213#include <sys/lkm.h>
2214
2215MOD_MISC("ip_mroute_mod")
2216
2217static int
2218ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd)
2219{
2220 int i;
2221 struct lkm_misc *args = lkmtp->private.lkm_misc;
2222 int err = 0;
2223
2224 switch(cmd) {
2225 static int (*old_ip_mrouter_cmd)();
2226 static int (*old_ip_mrouter_done)();
2227 static int (*old_ip_mforward)();
2228 static int (*old_mrt_ioctl)();
2229 static void (*old_proto4_input)();
2230 static int (*old_legal_vif_num)();
2231 extern struct protosw inetsw[];
2232
2233 case LKM_E_LOAD:
2234 if(lkmexists(lkmtp) || ip_mrtproto)
2235 return(EEXIST);
2236 old_ip_mrouter_cmd = ip_mrouter_cmd;
2237 ip_mrouter_cmd = X_ip_mrouter_cmd;
2238 old_ip_mrouter_done = ip_mrouter_done;
2239 ip_mrouter_done = X_ip_mrouter_done;
2240 old_ip_mforward = ip_mforward;
2241 ip_mforward = X_ip_mforward;
2242 old_mrt_ioctl = mrt_ioctl;
2243 mrt_ioctl = X_mrt_ioctl;
2244 old_proto4_input = inetsw[ip_protox[ENCAP_PROTO]].pr_input;
2245 inetsw[ip_protox[ENCAP_PROTO]].pr_input = X_ipip_input;
2246 old_legal_vif_num = legal_vif_num;
2247 legal_vif_num = X_legal_vif_num;
2248 ip_mrtproto = IGMP_DVMRP;
2249
2250 printf("\nIP multicast routing loaded\n");
2251 break;
2252
2253 case LKM_E_UNLOAD:
2254 if (ip_mrouter)
2255 return EINVAL;
2256
2257 ip_mrouter_cmd = old_ip_mrouter_cmd;
2258 ip_mrouter_done = old_ip_mrouter_done;
2259 ip_mforward = old_ip_mforward;
2260 mrt_ioctl = old_mrt_ioctl;
2261 inetsw[ip_protox[ENCAP_PROTO]].pr_input = old_proto4_input;
2262 legal_vif_num = old_legal_vif_num;
2263 ip_mrtproto = 0;
2264 break;
2265
2266 default:
2267 err = EINVAL;
2268 break;
2269 }
2270
2271 return(err);
2272}
2273
2274int
2275ip_mroute_mod(struct lkm_table *lkmtp, int cmd, int ver) {
2276 DISPATCH(lkmtp, cmd, ver, ip_mroute_mod_handle, ip_mroute_mod_handle,
2277 nosys);
2278}
2279
2280#endif /* MROUTE_LKM */
2281#endif /* MROUTING */
2 * IP multicast forwarding procedures
3 *
4 * Written by David Waitzman, BBN Labs, August 1988.
5 * Modified by Steve Deering, Stanford, February 1989.
6 * Modified by Mark J. Steiglitz, Stanford, May, 1991
7 * Modified by Van Jacobson, LBL, January 1993
8 * Modified by Ajit Thyagarajan, PARC, August 1993
9 * Modified by Bill Fenner, PARC, April 1995
10 *
11 * MROUTING Revision: 3.5
12 * $Id: ip_mroute.c,v 1.53 1999/01/18 02:06:57 fenner Exp $
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
54extern u_long _ip_mcast_src __P((int vifi));
55extern int _ip_mforward __P((struct ip *ip, struct ifnet *ifp,
56 struct mbuf *m, struct ip_moptions *imo));
57extern int _ip_mrouter_done __P((void));
58extern int _ip_mrouter_get __P((struct socket *so, struct sockopt *sopt));
59extern int _ip_mrouter_set __P((struct socket *so, struct sockopt *sopt));
60extern 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
66struct socket *ip_mrouter = NULL;
67u_int rsvpdebug = 0;
68
69int
70_ip_mrouter_set(so, sopt)
71 struct socket *so;
72 struct sockopt *sopt;
73{
74 return(EOPNOTSUPP);
75}
76
77int (*ip_mrouter_set)(struct socket *, struct sockopt *) = _ip_mrouter_set;
78
79
80int
81_ip_mrouter_get(so, sopt)
82 struct socket *so;
83 struct sockopt *sopt;
84{
85 return(EOPNOTSUPP);
86}
87
88int (*ip_mrouter_get)(struct socket *, struct sockopt *) = _ip_mrouter_get;
89
90int
91_ip_mrouter_done()
92{
93 return(0);
94}
95
96int (*ip_mrouter_done)(void) = _ip_mrouter_done;
97
98int
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
108int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
109 struct ip_moptions *) = _ip_mforward;
110
111int
112_mrt_ioctl(int req, caddr_t data, struct proc *p)
113{
114 return EOPNOTSUPP;
115}
116
117int (*mrt_ioctl)(int, caddr_t, struct proc *) = _mrt_ioctl;
118
119void
120rsvp_input(m, iphlen) /* XXX must fixup manually */
121 struct mbuf *m;
122 int iphlen;
123{
124 /* Can still get packets with rsvp_on = 0 if there is a local member
125 * of the group to which the RSVP packet is addressed. But in this
126 * case we want to throw the packet away.
127 */
128 if (!rsvp_on) {
129 m_freem(m);
130 return;
131 }
132
133 if (ip_rsvpd != NULL) {
134 if (rsvpdebug)
135 printf("rsvp_input: Sending packet up old-style socket\n");
136 rip_input(m, iphlen);
137 return;
138 }
139 /* Drop the packet */
140 m_freem(m);
141}
142
143void ipip_input(struct mbuf *m, int iphlen) { /* XXX must fixup manually */
144 rip_input(m, iphlen);
145}
146
147int (*legal_vif_num)(int) = 0;
148
149/*
150 * This should never be called, since IP_MULTICAST_VIF should fail, but
151 * just in case it does get called, the code a little lower in ip_output
152 * will assign the packet a local address.
153 */
154u_long
155_ip_mcast_src(int vifi) { return INADDR_ANY; }
156u_long (*ip_mcast_src)(int) = _ip_mcast_src;
157
158int
159ip_rsvp_vif_init(so, sopt)
160 struct socket *so;
161 struct sockopt *sopt;
162{
163 return(EINVAL);
164}
165
166int
167ip_rsvp_vif_done(so, sopt)
168 struct socket *so;
169 struct sockopt *sopt;
170{
171 return(EINVAL);
172}
173
174void
175ip_rsvp_force_done(so)
176 struct socket *so;
177{
178 return;
179}
180
181#else /* MROUTING */
182
183#define M_HASCL(m) ((m)->m_flags & M_EXT)
184
185#define INSIZ sizeof(struct in_addr)
186#define same(a1, a2) \
187 (bcmp((caddr_t)(a1), (caddr_t)(a2), INSIZ) == 0)
188
189static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast routing tables");
190
191/*
192 * Globals. All but ip_mrouter and ip_mrtproto could be static,
193 * except for netstat or debugging purposes.
194 */
195#ifndef MROUTE_LKM
196struct socket *ip_mrouter = NULL;
197static struct mrtstat mrtstat;
198#else /* MROUTE_LKM */
199extern void X_ipip_input __P((struct mbuf *m, int iphlen));
200extern struct mrtstat mrtstat;
201static int ip_mrtproto;
202#endif
203
204#define NO_RTE_FOUND 0x1
205#define RTE_FOUND 0x2
206
207static struct mfc *mfctable[MFCTBLSIZ];
208static u_char nexpire[MFCTBLSIZ];
209static struct vif viftable[MAXVIFS];
210static u_int mrtdebug = 0; /* debug level */
211#define DEBUG_MFC 0x02
212#define DEBUG_FORWARD 0x04
213#define DEBUG_EXPIRE 0x08
214#define DEBUG_XMIT 0x10
215static u_int tbfdebug = 0; /* tbf debug level */
216static u_int rsvpdebug = 0; /* rsvp debug level */
217
218static struct callout_handle expire_upcalls_ch;
219
220#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
221#define UPCALL_EXPIRE 6 /* number of timeouts */
222
223/*
224 * Define the token bucket filter structures
225 * tbftable -> each vif has one of these for storing info
226 */
227
228static struct tbf tbftable[MAXVIFS];
229#define TBF_REPROCESS (hz / 100) /* 100x / second */
230
231/*
232 * 'Interfaces' associated with decapsulator (so we can tell
233 * packets that went through it from ones that get reflected
234 * by a broken gateway). These interfaces are never linked into
235 * the system ifnet list & no routes point to them. I.e., packets
236 * can't be sent this way. They only exist as a placeholder for
237 * multicast source verification.
238 */
239static struct ifnet multicast_decap_if[MAXVIFS];
240
241#define ENCAP_TTL 64
242#define ENCAP_PROTO IPPROTO_IPIP /* 4 */
243
244/* prototype IP hdr for encapsulated packets */
245static struct ip multicast_encap_iphdr = {
246#if BYTE_ORDER == LITTLE_ENDIAN
247 sizeof(struct ip) >> 2, IPVERSION,
248#else
249 IPVERSION, sizeof(struct ip) >> 2,
250#endif
251 0, /* tos */
252 sizeof(struct ip), /* total length */
253 0, /* id */
254 0, /* frag offset */
255 ENCAP_TTL, ENCAP_PROTO,
256 0, /* checksum */
257};
258
259/*
260 * Private variables.
261 */
262static vifi_t numvifs = 0;
263static int have_encap_tunnel = 0;
264
265/*
266 * one-back cache used by ipip_input to locate a tunnel's vif
267 * given a datagram's src ip address.
268 */
269static u_long last_encap_src;
270static struct vif *last_encap_vif;
271
272static u_long X_ip_mcast_src __P((int vifi));
273static int X_ip_mforward __P((struct ip *ip, struct ifnet *ifp, struct mbuf *m, struct ip_moptions *imo));
274static int X_ip_mrouter_done __P((void));
275static int X_ip_mrouter_get __P((struct socket *so, struct sockopt *m));
276static int X_ip_mrouter_set __P((struct socket *so, struct sockopt *m));
277static int X_legal_vif_num __P((int vif));
278static int X_mrt_ioctl __P((int cmd, caddr_t data));
279
280static int get_sg_cnt(struct sioc_sg_req *);
281static int get_vif_cnt(struct sioc_vif_req *);
282static int ip_mrouter_init(struct socket *, int);
283static int add_vif(struct vifctl *);
284static int del_vif(vifi_t);
285static int add_mfc(struct mfcctl *);
286static int del_mfc(struct mfcctl *);
287static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *);
288static int set_assert(int);
289static void expire_upcalls(void *);
290static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *,
291 vifi_t);
292static void phyint_send(struct ip *, struct vif *, struct mbuf *);
293static void encap_send(struct ip *, struct vif *, struct mbuf *);
294static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long);
295static void tbf_queue(struct vif *, struct mbuf *);
296static void tbf_process_q(struct vif *);
297static void tbf_reprocess_q(void *);
298static int tbf_dq_sel(struct vif *, struct ip *);
299static void tbf_send_packet(struct vif *, struct mbuf *);
300static void tbf_update_tokens(struct vif *);
301static int priority(struct vif *, struct ip *);
302void multiencap_decap(struct mbuf *);
303
304/*
305 * whether or not special PIM assert processing is enabled.
306 */
307static int pim_assert;
308/*
309 * Rate limit for assert notification messages, in usec
310 */
311#define ASSERT_MSG_TIME 3000000
312
313/*
314 * Hash function for a source, group entry
315 */
316#define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \
317 ((g) >> 20) ^ ((g) >> 10) ^ (g))
318
319/*
320 * Find a route for a given origin IP address and Multicast group address
321 * Type of service parameter to be added in the future!!!
322 */
323
324#define MFCFIND(o, g, rt) { \
325 register struct mfc *_rt = mfctable[MFCHASH(o,g)]; \
326 rt = NULL; \
327 ++mrtstat.mrts_mfc_lookups; \
328 while (_rt) { \
329 if ((_rt->mfc_origin.s_addr == o) && \
330 (_rt->mfc_mcastgrp.s_addr == g) && \
331 (_rt->mfc_stall == NULL)) { \
332 rt = _rt; \
333 break; \
334 } \
335 _rt = _rt->mfc_next; \
336 } \
337 if (rt == NULL) { \
338 ++mrtstat.mrts_mfc_misses; \
339 } \
340}
341
342
343/*
344 * Macros to compute elapsed time efficiently
345 * Borrowed from Van Jacobson's scheduling code
346 */
347#define TV_DELTA(a, b, delta) { \
348 register int xxs; \
349 \
350 delta = (a).tv_usec - (b).tv_usec; \
351 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
352 switch (xxs) { \
353 case 2: \
354 delta += 1000000; \
355 /* fall through */ \
356 case 1: \
357 delta += 1000000; \
358 break; \
359 default: \
360 delta += (1000000 * xxs); \
361 } \
362 } \
363}
364
365#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
366 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
367
368#ifdef UPCALL_TIMING
369u_long upcall_data[51];
370static void collate(struct timeval *);
371#endif /* UPCALL_TIMING */
372
373
374/*
375 * Handle MRT setsockopt commands to modify the multicast routing tables.
376 */
377static int
378X_ip_mrouter_set(so, sopt)
379 struct socket *so;
380 struct sockopt *sopt;
381{
382 int error, optval;
383 vifi_t vifi;
384 struct vifctl vifc;
385 struct mfcctl mfc;
386
387 if (so != ip_mrouter && sopt->sopt_name != MRT_INIT)
388 return (EPERM);
389
390 error = 0;
391 switch (sopt->sopt_name) {
392 case MRT_INIT:
393 error = sooptcopyin(sopt, &optval, sizeof optval,
394 sizeof optval);
395 if (error)
396 break;
397 error = ip_mrouter_init(so, optval);
398 break;
399
400 case MRT_DONE:
401 error = ip_mrouter_done();
402 break;
403
404 case MRT_ADD_VIF:
405 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc);
406 if (error)
407 break;
408 error = add_vif(&vifc);
409 break;
410
411 case MRT_DEL_VIF:
412 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
413 if (error)
414 break;
415 error = del_vif(vifi);
416 break;
417
418 case MRT_ADD_MFC:
419 case MRT_DEL_MFC:
420 error = sooptcopyin(sopt, &mfc, sizeof mfc, sizeof mfc);
421 if (error)
422 break;
423 if (sopt->sopt_name == MRT_ADD_MFC)
424 error = add_mfc(&mfc);
425 else
426 error = del_mfc(&mfc);
427 break;
428
429 case MRT_ASSERT:
430 error = sooptcopyin(sopt, &optval, sizeof optval,
431 sizeof optval);
432 if (error)
433 break;
434 set_assert(optval);
435 break;
436
437 default:
438 error = EOPNOTSUPP;
439 break;
440 }
441 return (error);
442}
443
444#ifndef MROUTE_LKM
445int (*ip_mrouter_set)(struct socket *, struct sockopt *) = X_ip_mrouter_set;
446#endif
447
448/*
449 * Handle MRT getsockopt commands
450 */
451static int
452X_ip_mrouter_get(so, sopt)
453 struct socket *so;
454 struct sockopt *sopt;
455{
456 int error;
457 static int version = 0x0305; /* !!! why is this here? XXX */
458
459 switch (sopt->sopt_name) {
460 case MRT_VERSION:
461 error = sooptcopyout(sopt, &version, sizeof version);
462 break;
463
464 case MRT_ASSERT:
465 error = sooptcopyout(sopt, &pim_assert, sizeof pim_assert);
466 break;
467 default:
468 error = EOPNOTSUPP;
469 break;
470 }
471 return (error);
472}
473
474#ifndef MROUTE_LKM
475int (*ip_mrouter_get)(struct socket *, struct sockopt *) = X_ip_mrouter_get;
476#endif
477
478/*
479 * Handle ioctl commands to obtain information from the cache
480 */
481static int
482X_mrt_ioctl(cmd, data)
483 int cmd;
484 caddr_t data;
485{
486 int error = 0;
487
488 switch (cmd) {
489 case (SIOCGETVIFCNT):
490 return (get_vif_cnt((struct sioc_vif_req *)data));
491 break;
492 case (SIOCGETSGCNT):
493 return (get_sg_cnt((struct sioc_sg_req *)data));
494 break;
495 default:
496 return (EINVAL);
497 break;
498 }
499 return error;
500}
501
502#ifndef MROUTE_LKM
503int (*mrt_ioctl)(int, caddr_t) = X_mrt_ioctl;
504#endif
505
506/*
507 * returns the packet, byte, rpf-failure count for the source group provided
508 */
509static int
510get_sg_cnt(req)
511 register struct sioc_sg_req *req;
512{
513 register struct mfc *rt;
514 int s;
515
516 s = splnet();
517 MFCFIND(req->src.s_addr, req->grp.s_addr, rt);
518 splx(s);
519 if (rt != NULL) {
520 req->pktcnt = rt->mfc_pkt_cnt;
521 req->bytecnt = rt->mfc_byte_cnt;
522 req->wrong_if = rt->mfc_wrong_if;
523 } else
524 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
525
526 return 0;
527}
528
529/*
530 * returns the input and output packet and byte counts on the vif provided
531 */
532static int
533get_vif_cnt(req)
534 register struct sioc_vif_req *req;
535{
536 register vifi_t vifi = req->vifi;
537
538 if (vifi >= numvifs) return EINVAL;
539
540 req->icount = viftable[vifi].v_pkt_in;
541 req->ocount = viftable[vifi].v_pkt_out;
542 req->ibytes = viftable[vifi].v_bytes_in;
543 req->obytes = viftable[vifi].v_bytes_out;
544
545 return 0;
546}
547
548/*
549 * Enable multicast routing
550 */
551static int
552ip_mrouter_init(so, version)
553 struct socket *so;
554 int version;
555{
556 if (mrtdebug)
557 log(LOG_DEBUG,"ip_mrouter_init: so_type = %d, pr_protocol = %d\n",
558 so->so_type, so->so_proto->pr_protocol);
559
560 if (so->so_type != SOCK_RAW ||
561 so->so_proto->pr_protocol != IPPROTO_IGMP) return EOPNOTSUPP;
562
563 if (version != 1)
564 return ENOPROTOOPT;
565
566 if (ip_mrouter != NULL) return EADDRINUSE;
567
568 ip_mrouter = so;
569
570 bzero((caddr_t)mfctable, sizeof(mfctable));
571 bzero((caddr_t)nexpire, sizeof(nexpire));
572
573 pim_assert = 0;
574
575 expire_upcalls_ch = timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
576
577 if (mrtdebug)
578 log(LOG_DEBUG, "ip_mrouter_init\n");
579
580 return 0;
581}
582
583/*
584 * Disable multicast routing
585 */
586static int
587X_ip_mrouter_done()
588{
589 vifi_t vifi;
590 int i;
591 struct ifnet *ifp;
592 struct ifreq ifr;
593 struct mfc *rt;
594 struct rtdetq *rte;
595 int s;
596
597 s = splnet();
598
599 /*
600 * For each phyint in use, disable promiscuous reception of all IP
601 * multicasts.
602 */
603 for (vifi = 0; vifi < numvifs; vifi++) {
604 if (viftable[vifi].v_lcl_addr.s_addr != 0 &&
605 !(viftable[vifi].v_flags & VIFF_TUNNEL)) {
606 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET;
607 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr
608 = INADDR_ANY;
609 ifp = viftable[vifi].v_ifp;
610 if_allmulti(ifp, 0);
611 }
612 }
613 bzero((caddr_t)tbftable, sizeof(tbftable));
614 bzero((caddr_t)viftable, sizeof(viftable));
615 numvifs = 0;
616 pim_assert = 0;
617
618 untimeout(expire_upcalls, (caddr_t)NULL, expire_upcalls_ch);
619
620 /*
621 * Free all multicast forwarding cache entries.
622 */
623 for (i = 0; i < MFCTBLSIZ; i++) {
624 for (rt = mfctable[i]; rt != NULL; ) {
625 struct mfc *nr = rt->mfc_next;
626
627 for (rte = rt->mfc_stall; rte != NULL; ) {
628 struct rtdetq *n = rte->next;
629
630 m_freem(rte->m);
631 free(rte, M_MRTABLE);
632 rte = n;
633 }
634 free(rt, M_MRTABLE);
635 rt = nr;
636 }
637 }
638
639 bzero((caddr_t)mfctable, sizeof(mfctable));
640
641 /*
642 * Reset de-encapsulation cache
643 */
644 last_encap_src = 0;
645 last_encap_vif = NULL;
646 have_encap_tunnel = 0;
647
648 ip_mrouter = NULL;
649
650 splx(s);
651
652 if (mrtdebug)
653 log(LOG_DEBUG, "ip_mrouter_done\n");
654
655 return 0;
656}
657
658#ifndef MROUTE_LKM
659int (*ip_mrouter_done)(void) = X_ip_mrouter_done;
660#endif
661
662/*
663 * Set PIM assert processing global
664 */
665static int
666set_assert(i)
667 int i;
668{
669 if ((i != 1) && (i != 0))
670 return EINVAL;
671
672 pim_assert = i;
673
674 return 0;
675}
676
677/*
678 * Add a vif to the vif table
679 */
680static int
681add_vif(vifcp)
682 register struct vifctl *vifcp;
683{
684 register struct vif *vifp = viftable + vifcp->vifc_vifi;
685 static struct sockaddr_in sin = {sizeof sin, AF_INET};
686 struct ifaddr *ifa;
687 struct ifnet *ifp;
688 int error, s;
689 struct tbf *v_tbf = tbftable + vifcp->vifc_vifi;
690
691 if (vifcp->vifc_vifi >= MAXVIFS) return EINVAL;
692 if (vifp->v_lcl_addr.s_addr != 0) return EADDRINUSE;
693
694 /* Find the interface with an address in AF_INET family */
695 sin.sin_addr = vifcp->vifc_lcl_addr;
696 ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
697 if (ifa == 0) return EADDRNOTAVAIL;
698 ifp = ifa->ifa_ifp;
699
700 if (vifcp->vifc_flags & VIFF_TUNNEL) {
701 if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) {
702 /*
703 * An encapsulating tunnel is wanted. Tell ipip_input() to
704 * start paying attention to encapsulated packets.
705 */
706 if (have_encap_tunnel == 0) {
707 have_encap_tunnel = 1;
708 for (s = 0; s < MAXVIFS; ++s) {
709 multicast_decap_if[s].if_name = "mdecap";
710 multicast_decap_if[s].if_unit = s;
711 }
712 }
713 /*
714 * Set interface to fake encapsulator interface
715 */
716 ifp = &multicast_decap_if[vifcp->vifc_vifi];
717 /*
718 * Prepare cached route entry
719 */
720 bzero(&vifp->v_route, sizeof(vifp->v_route));
721 } else {
722 log(LOG_ERR, "source routed tunnels not supported\n");
723 return EOPNOTSUPP;
724 }
725 } else {
726 /* Make sure the interface supports multicast */
727 if ((ifp->if_flags & IFF_MULTICAST) == 0)
728 return EOPNOTSUPP;
729
730 /* Enable promiscuous reception of all IP multicasts from the if */
731 s = splnet();
732 error = if_allmulti(ifp, 1);
733 splx(s);
734 if (error)
735 return error;
736 }
737
738 s = splnet();
739 /* define parameters for the tbf structure */
740 vifp->v_tbf = v_tbf;
741 GET_TIME(vifp->v_tbf->tbf_last_pkt_t);
742 vifp->v_tbf->tbf_n_tok = 0;
743 vifp->v_tbf->tbf_q_len = 0;
744 vifp->v_tbf->tbf_max_q_len = MAXQSIZE;
745 vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL;
746
747 vifp->v_flags = vifcp->vifc_flags;
748 vifp->v_threshold = vifcp->vifc_threshold;
749 vifp->v_lcl_addr = vifcp->vifc_lcl_addr;
750 vifp->v_rmt_addr = vifcp->vifc_rmt_addr;
751 vifp->v_ifp = ifp;
752 /* scaling up here allows division by 1024 in critical code */
753 vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000;
754 vifp->v_rsvp_on = 0;
755 vifp->v_rsvpd = NULL;
756 /* initialize per vif pkt counters */
757 vifp->v_pkt_in = 0;
758 vifp->v_pkt_out = 0;
759 vifp->v_bytes_in = 0;
760 vifp->v_bytes_out = 0;
761 splx(s);
762
763 /* Adjust numvifs up if the vifi is higher than numvifs */
764 if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1;
765
766 if (mrtdebug)
767 log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n",
768 vifcp->vifc_vifi,
769 (u_long)ntohl(vifcp->vifc_lcl_addr.s_addr),
770 (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask",
771 (u_long)ntohl(vifcp->vifc_rmt_addr.s_addr),
772 vifcp->vifc_threshold,
773 vifcp->vifc_rate_limit);
774
775 return 0;
776}
777
778/*
779 * Delete a vif from the vif table
780 */
781static int
782del_vif(vifi)
783 vifi_t vifi;
784{
785 register struct vif *vifp = &viftable[vifi];
786 register struct mbuf *m;
787 struct ifnet *ifp;
788 struct ifreq ifr;
789 int s;
790
791 if (vifi >= numvifs) return EINVAL;
792 if (vifp->v_lcl_addr.s_addr == 0) return EADDRNOTAVAIL;
793
794 s = splnet();
795
796 if (!(vifp->v_flags & VIFF_TUNNEL)) {
797 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET;
798 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY;
799 ifp = vifp->v_ifp;
800 if_allmulti(ifp, 0);
801 }
802
803 if (vifp == last_encap_vif) {
804 last_encap_vif = 0;
805 last_encap_src = 0;
806 }
807
808 /*
809 * Free packets queued at the interface
810 */
811 while (vifp->v_tbf->tbf_q) {
812 m = vifp->v_tbf->tbf_q;
813 vifp->v_tbf->tbf_q = m->m_act;
814 m_freem(m);
815 }
816
817 bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf)));
818 bzero((caddr_t)vifp, sizeof (*vifp));
819
820 if (mrtdebug)
821 log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs);
822
823 /* Adjust numvifs down */
824 for (vifi = numvifs; vifi > 0; vifi--)
825 if (viftable[vifi-1].v_lcl_addr.s_addr != 0) break;
826 numvifs = vifi;
827
828 splx(s);
829
830 return 0;
831}
832
833/*
834 * Add an mfc entry
835 */
836static int
837add_mfc(mfccp)
838 struct mfcctl *mfccp;
839{
840 struct mfc *rt;
841 u_long hash;
842 struct rtdetq *rte;
843 register u_short nstl;
844 int s;
845 int i;
846
847 MFCFIND(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr, rt);
848
849 /* If an entry already exists, just update the fields */
850 if (rt) {
851 if (mrtdebug & DEBUG_MFC)
852 log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n",
853 (u_long)ntohl(mfccp->mfcc_origin.s_addr),
854 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
855 mfccp->mfcc_parent);
856
857 s = splnet();
858 rt->mfc_parent = mfccp->mfcc_parent;
859 for (i = 0; i < numvifs; i++)
860 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
861 splx(s);
862 return 0;
863 }
864
865 /*
866 * Find the entry for which the upcall was made and update
867 */
868 s = splnet();
869 hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr);
870 for (rt = mfctable[hash], nstl = 0; rt; rt = rt->mfc_next) {
871
872 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) &&
873 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) &&
874 (rt->mfc_stall != NULL)) {
875
876 if (nstl++)
877 log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n",
878 "multiple kernel entries",
879 (u_long)ntohl(mfccp->mfcc_origin.s_addr),
880 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
881 mfccp->mfcc_parent, (void *)rt->mfc_stall);
882
883 if (mrtdebug & DEBUG_MFC)
884 log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n",
885 (u_long)ntohl(mfccp->mfcc_origin.s_addr),
886 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
887 mfccp->mfcc_parent, (void *)rt->mfc_stall);
888
889 rt->mfc_origin = mfccp->mfcc_origin;
890 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
891 rt->mfc_parent = mfccp->mfcc_parent;
892 for (i = 0; i < numvifs; i++)
893 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
894 /* initialize pkt counters per src-grp */
895 rt->mfc_pkt_cnt = 0;
896 rt->mfc_byte_cnt = 0;
897 rt->mfc_wrong_if = 0;
898 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
899
900 rt->mfc_expire = 0; /* Don't clean this guy up */
901 nexpire[hash]--;
902
903 /* free packets Qed at the end of this entry */
904 for (rte = rt->mfc_stall; rte != NULL; ) {
905 struct rtdetq *n = rte->next;
906
907 ip_mdq(rte->m, rte->ifp, rt, -1);
908 m_freem(rte->m);
909#ifdef UPCALL_TIMING
910 collate(&(rte->t));
911#endif /* UPCALL_TIMING */
912 free(rte, M_MRTABLE);
913 rte = n;
914 }
915 rt->mfc_stall = NULL;
916 }
917 }
918
919 /*
920 * It is possible that an entry is being inserted without an upcall
921 */
922 if (nstl == 0) {
923 if (mrtdebug & DEBUG_MFC)
924 log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n",
925 hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr),
926 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
927 mfccp->mfcc_parent);
928
929 for (rt = mfctable[hash]; rt != NULL; rt = rt->mfc_next) {
930
931 if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) &&
932 (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) {
933
934 rt->mfc_origin = mfccp->mfcc_origin;
935 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
936 rt->mfc_parent = mfccp->mfcc_parent;
937 for (i = 0; i < numvifs; i++)
938 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
939 /* initialize pkt counters per src-grp */
940 rt->mfc_pkt_cnt = 0;
941 rt->mfc_byte_cnt = 0;
942 rt->mfc_wrong_if = 0;
943 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
944 if (rt->mfc_expire)
945 nexpire[hash]--;
946 rt->mfc_expire = 0;
947 }
948 }
949 if (rt == NULL) {
950 /* no upcall, so make a new entry */
951 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
952 if (rt == NULL) {
953 splx(s);
954 return ENOBUFS;
955 }
956
957 /* insert new entry at head of hash chain */
958 rt->mfc_origin = mfccp->mfcc_origin;
959 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
960 rt->mfc_parent = mfccp->mfcc_parent;
961 for (i = 0; i < numvifs; i++)
962 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
963 /* initialize pkt counters per src-grp */
964 rt->mfc_pkt_cnt = 0;
965 rt->mfc_byte_cnt = 0;
966 rt->mfc_wrong_if = 0;
967 rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
968 rt->mfc_expire = 0;
969 rt->mfc_stall = NULL;
970
971 /* link into table */
972 rt->mfc_next = mfctable[hash];
973 mfctable[hash] = rt;
974 }
975 }
976 splx(s);
977 return 0;
978}
979
980#ifdef UPCALL_TIMING
981/*
982 * collect delay statistics on the upcalls
983 */
984static void collate(t)
985register struct timeval *t;
986{
987 register u_long d;
988 register struct timeval tp;
989 register u_long delta;
990
991 GET_TIME(tp);
992
993 if (TV_LT(*t, tp))
994 {
995 TV_DELTA(tp, *t, delta);
996
997 d = delta >> 10;
998 if (d > 50)
999 d = 50;
1000
1001 ++upcall_data[d];
1002 }
1003}
1004#endif /* UPCALL_TIMING */
1005
1006/*
1007 * Delete an mfc entry
1008 */
1009static int
1010del_mfc(mfccp)
1011 struct mfcctl *mfccp;
1012{
1013 struct in_addr origin;
1014 struct in_addr mcastgrp;
1015 struct mfc *rt;
1016 struct mfc **nptr;
1017 u_long hash;
1018 int s;
1019
1020 origin = mfccp->mfcc_origin;
1021 mcastgrp = mfccp->mfcc_mcastgrp;
1022 hash = MFCHASH(origin.s_addr, mcastgrp.s_addr);
1023
1024 if (mrtdebug & DEBUG_MFC)
1025 log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n",
1026 (u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr));
1027
1028 s = splnet();
1029
1030 nptr = &mfctable[hash];
1031 while ((rt = *nptr) != NULL) {
1032 if (origin.s_addr == rt->mfc_origin.s_addr &&
1033 mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr &&
1034 rt->mfc_stall == NULL)
1035 break;
1036
1037 nptr = &rt->mfc_next;
1038 }
1039 if (rt == NULL) {
1040 splx(s);
1041 return EADDRNOTAVAIL;
1042 }
1043
1044 *nptr = rt->mfc_next;
1045 free(rt, M_MRTABLE);
1046
1047 splx(s);
1048
1049 return 0;
1050}
1051
1052/*
1053 * Send a message to mrouted on the multicast routing socket
1054 */
1055static int
1056socket_send(s, mm, src)
1057 struct socket *s;
1058 struct mbuf *mm;
1059 struct sockaddr_in *src;
1060{
1061 if (s) {
1062 if (sbappendaddr(&s->so_rcv,
1063 (struct sockaddr *)src,
1064 mm, (struct mbuf *)0) != 0) {
1065 sorwakeup(s);
1066 return 0;
1067 }
1068 }
1069 m_freem(mm);
1070 return -1;
1071}
1072
1073/*
1074 * IP multicast forwarding function. This function assumes that the packet
1075 * pointed to by "ip" has arrived on (or is about to be sent to) the interface
1076 * pointed to by "ifp", and the packet is to be relayed to other networks
1077 * that have members of the packet's destination IP multicast group.
1078 *
1079 * The packet is returned unscathed to the caller, unless it is
1080 * erroneous, in which case a non-zero return value tells the caller to
1081 * discard it.
1082 */
1083
1084#define IP_HDR_LEN 20 /* # bytes of fixed IP header (excluding options) */
1085#define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */
1086
1087static int
1088X_ip_mforward(ip, ifp, m, imo)
1089 register struct ip *ip;
1090 struct ifnet *ifp;
1091 struct mbuf *m;
1092 struct ip_moptions *imo;
1093{
1094 register struct mfc *rt;
1095 register u_char *ipoptions;
1096 static struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
1097 static int srctun = 0;
1098 register struct mbuf *mm;
1099 int s;
1100 vifi_t vifi;
1101 struct vif *vifp;
1102
1103 if (mrtdebug & DEBUG_FORWARD)
1104 log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n",
1105 (u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr),
1106 (void *)ifp);
1107
1108 if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 ||
1109 (ipoptions = (u_char *)(ip + 1))[1] != IPOPT_LSRR ) {
1110 /*
1111 * Packet arrived via a physical interface or
1112 * an encapsulated tunnel.
1113 */
1114 } else {
1115 /*
1116 * Packet arrived through a source-route tunnel.
1117 * Source-route tunnels are no longer supported.
1118 */
1119 if ((srctun++ % 1000) == 0)
1120 log(LOG_ERR,
1121 "ip_mforward: received source-routed packet from %lx\n",
1122 (u_long)ntohl(ip->ip_src.s_addr));
1123
1124 return 1;
1125 }
1126
1127 if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) {
1128 if (ip->ip_ttl < 255)
1129 ip->ip_ttl++; /* compensate for -1 in *_send routines */
1130 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) {
1131 vifp = viftable + vifi;
1132 printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s%d)\n",
1133 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), vifi,
1134 (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "",
1135 vifp->v_ifp->if_name, vifp->v_ifp->if_unit);
1136 }
1137 return (ip_mdq(m, ifp, NULL, vifi));
1138 }
1139 if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) {
1140 printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n",
1141 ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr));
1142 if(!imo)
1143 printf("In fact, no options were specified at all\n");
1144 }
1145
1146 /*
1147 * Don't forward a packet with time-to-live of zero or one,
1148 * or a packet destined to a local-only group.
1149 */
1150 if (ip->ip_ttl <= 1 ||
1151 ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP)
1152 return 0;
1153
1154 /*
1155 * Determine forwarding vifs from the forwarding cache table
1156 */
1157 s = splnet();
1158 MFCFIND(ip->ip_src.s_addr, ip->ip_dst.s_addr, rt);
1159
1160 /* Entry exists, so forward if necessary */
1161 if (rt != NULL) {
1162 splx(s);
1163 return (ip_mdq(m, ifp, rt, -1));
1164 } else {
1165 /*
1166 * If we don't have a route for packet's origin,
1167 * Make a copy of the packet &
1168 * send message to routing daemon
1169 */
1170
1171 register struct mbuf *mb0;
1172 register struct rtdetq *rte;
1173 register u_long hash;
1174 int hlen = ip->ip_hl << 2;
1175#ifdef UPCALL_TIMING
1176 struct timeval tp;
1177
1178 GET_TIME(tp);
1179#endif
1180
1181 mrtstat.mrts_no_route++;
1182 if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC))
1183 log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n",
1184 (u_long)ntohl(ip->ip_src.s_addr),
1185 (u_long)ntohl(ip->ip_dst.s_addr));
1186
1187 /*
1188 * Allocate mbufs early so that we don't do extra work if we are
1189 * just going to fail anyway. Make sure to pullup the header so
1190 * that other people can't step on it.
1191 */
1192 rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, M_NOWAIT);
1193 if (rte == NULL) {
1194 splx(s);
1195 return ENOBUFS;
1196 }
1197 mb0 = m_copy(m, 0, M_COPYALL);
1198 if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen))
1199 mb0 = m_pullup(mb0, hlen);
1200 if (mb0 == NULL) {
1201 free(rte, M_MRTABLE);
1202 splx(s);
1203 return ENOBUFS;
1204 }
1205
1206 /* is there an upcall waiting for this packet? */
1207 hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr);
1208 for (rt = mfctable[hash]; rt; rt = rt->mfc_next) {
1209 if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) &&
1210 (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) &&
1211 (rt->mfc_stall != NULL))
1212 break;
1213 }
1214
1215 if (rt == NULL) {
1216 int i;
1217 struct igmpmsg *im;
1218
1219 /* no upcall, so make a new entry */
1220 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
1221 if (rt == NULL) {
1222 free(rte, M_MRTABLE);
1223 m_freem(mb0);
1224 splx(s);
1225 return ENOBUFS;
1226 }
1227 /* Make a copy of the header to send to the user level process */
1228 mm = m_copy(mb0, 0, hlen);
1229 if (mm == NULL) {
1230 free(rte, M_MRTABLE);
1231 m_freem(mb0);
1232 free(rt, M_MRTABLE);
1233 splx(s);
1234 return ENOBUFS;
1235 }
1236
1237 /*
1238 * Send message to routing daemon to install
1239 * a route into the kernel table
1240 */
1241 k_igmpsrc.sin_addr = ip->ip_src;
1242
1243 im = mtod(mm, struct igmpmsg *);
1244 im->im_msgtype = IGMPMSG_NOCACHE;
1245 im->im_mbz = 0;
1246
1247 mrtstat.mrts_upcalls++;
1248
1249 if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) {
1250 log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n");
1251 ++mrtstat.mrts_upq_sockfull;
1252 free(rte, M_MRTABLE);
1253 m_freem(mb0);
1254 free(rt, M_MRTABLE);
1255 splx(s);
1256 return ENOBUFS;
1257 }
1258
1259 /* insert new entry at head of hash chain */
1260 rt->mfc_origin.s_addr = ip->ip_src.s_addr;
1261 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr;
1262 rt->mfc_expire = UPCALL_EXPIRE;
1263 nexpire[hash]++;
1264 for (i = 0; i < numvifs; i++)
1265 rt->mfc_ttls[i] = 0;
1266 rt->mfc_parent = -1;
1267
1268 /* link into table */
1269 rt->mfc_next = mfctable[hash];
1270 mfctable[hash] = rt;
1271 rt->mfc_stall = rte;
1272
1273 } else {
1274 /* determine if q has overflowed */
1275 int npkts = 0;
1276 struct rtdetq **p;
1277
1278 for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next)
1279 npkts++;
1280
1281 if (npkts > MAX_UPQ) {
1282 mrtstat.mrts_upq_ovflw++;
1283 free(rte, M_MRTABLE);
1284 m_freem(mb0);
1285 splx(s);
1286 return 0;
1287 }
1288
1289 /* Add this entry to the end of the queue */
1290 *p = rte;
1291 }
1292
1293 rte->m = mb0;
1294 rte->ifp = ifp;
1295#ifdef UPCALL_TIMING
1296 rte->t = tp;
1297#endif
1298 rte->next = NULL;
1299
1300 splx(s);
1301
1302 return 0;
1303 }
1304}
1305
1306#ifndef MROUTE_LKM
1307int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
1308 struct ip_moptions *) = X_ip_mforward;
1309#endif
1310
1311/*
1312 * Clean up the cache entry if upcall is not serviced
1313 */
1314static void
1315expire_upcalls(void *unused)
1316{
1317 struct rtdetq *rte;
1318 struct mfc *mfc, **nptr;
1319 int i;
1320 int s;
1321
1322 s = splnet();
1323 for (i = 0; i < MFCTBLSIZ; i++) {
1324 if (nexpire[i] == 0)
1325 continue;
1326 nptr = &mfctable[i];
1327 for (mfc = *nptr; mfc != NULL; mfc = *nptr) {
1328 /*
1329 * Skip real cache entries
1330 * Make sure it wasn't marked to not expire (shouldn't happen)
1331 * If it expires now
1332 */
1333 if (mfc->mfc_stall != NULL &&
1334 mfc->mfc_expire != 0 &&
1335 --mfc->mfc_expire == 0) {
1336 if (mrtdebug & DEBUG_EXPIRE)
1337 log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n",
1338 (u_long)ntohl(mfc->mfc_origin.s_addr),
1339 (u_long)ntohl(mfc->mfc_mcastgrp.s_addr));
1340 /*
1341 * drop all the packets
1342 * free the mbuf with the pkt, if, timing info
1343 */
1344 for (rte = mfc->mfc_stall; rte; ) {
1345 struct rtdetq *n = rte->next;
1346
1347 m_freem(rte->m);
1348 free(rte, M_MRTABLE);
1349 rte = n;
1350 }
1351 ++mrtstat.mrts_cache_cleanups;
1352 nexpire[i]--;
1353
1354 *nptr = mfc->mfc_next;
1355 free(mfc, M_MRTABLE);
1356 } else {
1357 nptr = &mfc->mfc_next;
1358 }
1359 }
1360 }
1361 splx(s);
1362 expire_upcalls_ch = timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
1363}
1364
1365/*
1366 * Packet forwarding routine once entry in the cache is made
1367 */
1368static int
1369ip_mdq(m, ifp, rt, xmt_vif)
1370 register struct mbuf *m;
1371 register struct ifnet *ifp;
1372 register struct mfc *rt;
1373 register vifi_t xmt_vif;
1374{
1375 register struct ip *ip = mtod(m, struct ip *);
1376 register vifi_t vifi;
1377 register struct vif *vifp;
1378 register int plen = ip->ip_len;
1379
1380/*
1381 * Macro to send packet on vif. Since RSVP packets don't get counted on
1382 * input, they shouldn't get counted on output, so statistics keeping is
1383 * seperate.
1384 */
1385#define MC_SEND(ip,vifp,m) { \
1386 if ((vifp)->v_flags & VIFF_TUNNEL) \
1387 encap_send((ip), (vifp), (m)); \
1388 else \
1389 phyint_send((ip), (vifp), (m)); \
1390}
1391
1392 /*
1393 * If xmt_vif is not -1, send on only the requested vif.
1394 *
1395 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.)
1396 */
1397 if (xmt_vif < numvifs) {
1398 MC_SEND(ip, viftable + xmt_vif, m);
1399 return 1;
1400 }
1401
1402 /*
1403 * Don't forward if it didn't arrive from the parent vif for its origin.
1404 */
1405 vifi = rt->mfc_parent;
1406 if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) {
1407 /* came in the wrong interface */
1408 if (mrtdebug & DEBUG_FORWARD)
1409 log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n",
1410 (void *)ifp, vifi, (void *)viftable[vifi].v_ifp);
1411 ++mrtstat.mrts_wrong_if;
1412 ++rt->mfc_wrong_if;
1413 /*
1414 * If we are doing PIM assert processing, and we are forwarding
1415 * packets on this interface, and it is a broadcast medium
1416 * interface (and not a tunnel), send a message to the routing daemon.
1417 */
1418 if (pim_assert && rt->mfc_ttls[vifi] &&
1419 (ifp->if_flags & IFF_BROADCAST) &&
1420 !(viftable[vifi].v_flags & VIFF_TUNNEL)) {
1421 struct sockaddr_in k_igmpsrc;
1422 struct mbuf *mm;
1423 struct igmpmsg *im;
1424 int hlen = ip->ip_hl << 2;
1425 struct timeval now;
1426 register u_long delta;
1427
1428 GET_TIME(now);
1429
1430 TV_DELTA(rt->mfc_last_assert, now, delta);
1431
1432 if (delta > ASSERT_MSG_TIME) {
1433 mm = m_copy(m, 0, hlen);
1434 if (mm && (M_HASCL(mm) || mm->m_len < hlen))
1435 mm = m_pullup(mm, hlen);
1436 if (mm == NULL) {
1437 return ENOBUFS;
1438 }
1439
1440 rt->mfc_last_assert = now;
1441
1442 im = mtod(mm, struct igmpmsg *);
1443 im->im_msgtype = IGMPMSG_WRONGVIF;
1444 im->im_mbz = 0;
1445 im->im_vif = vifi;
1446
1447 k_igmpsrc.sin_addr = im->im_src;
1448
1449 socket_send(ip_mrouter, mm, &k_igmpsrc);
1450 }
1451 }
1452 return 0;
1453 }
1454
1455 /* If I sourced this packet, it counts as output, else it was input. */
1456 if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) {
1457 viftable[vifi].v_pkt_out++;
1458 viftable[vifi].v_bytes_out += plen;
1459 } else {
1460 viftable[vifi].v_pkt_in++;
1461 viftable[vifi].v_bytes_in += plen;
1462 }
1463 rt->mfc_pkt_cnt++;
1464 rt->mfc_byte_cnt += plen;
1465
1466 /*
1467 * For each vif, decide if a copy of the packet should be forwarded.
1468 * Forward if:
1469 * - the ttl exceeds the vif's threshold
1470 * - there are group members downstream on interface
1471 */
1472 for (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++)
1473 if ((rt->mfc_ttls[vifi] > 0) &&
1474 (ip->ip_ttl > rt->mfc_ttls[vifi])) {
1475 vifp->v_pkt_out++;
1476 vifp->v_bytes_out += plen;
1477 MC_SEND(ip, vifp, m);
1478 }
1479
1480 return 0;
1481}
1482
1483/*
1484 * check if a vif number is legal/ok. This is used by ip_output, to export
1485 * numvifs there,
1486 */
1487static int
1488X_legal_vif_num(vif)
1489 int vif;
1490{
1491 if (vif >= 0 && vif < numvifs)
1492 return(1);
1493 else
1494 return(0);
1495}
1496
1497#ifndef MROUTE_LKM
1498int (*legal_vif_num)(int) = X_legal_vif_num;
1499#endif
1500
1501/*
1502 * Return the local address used by this vif
1503 */
1504static u_long
1505X_ip_mcast_src(vifi)
1506 int vifi;
1507{
1508 if (vifi >= 0 && vifi < numvifs)
1509 return viftable[vifi].v_lcl_addr.s_addr;
1510 else
1511 return INADDR_ANY;
1512}
1513
1514#ifndef MROUTE_LKM
1515u_long (*ip_mcast_src)(int) = X_ip_mcast_src;
1516#endif
1517
1518static void
1519phyint_send(ip, vifp, m)
1520 struct ip *ip;
1521 struct vif *vifp;
1522 struct mbuf *m;
1523{
1524 register struct mbuf *mb_copy;
1525 register int hlen = ip->ip_hl << 2;
1526
1527 /*
1528 * Make a new reference to the packet; make sure that
1529 * the IP header is actually copied, not just referenced,
1530 * so that ip_output() only scribbles on the copy.
1531 */
1532 mb_copy = m_copy(m, 0, M_COPYALL);
1533 if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen))
1534 mb_copy = m_pullup(mb_copy, hlen);
1535 if (mb_copy == NULL)
1536 return;
1537
1538 if (vifp->v_rate_limit == 0)
1539 tbf_send_packet(vifp, mb_copy);
1540 else
1541 tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len);
1542}
1543
1544static void
1545encap_send(ip, vifp, m)
1546 register struct ip *ip;
1547 register struct vif *vifp;
1548 register struct mbuf *m;
1549{
1550 register struct mbuf *mb_copy;
1551 register struct ip *ip_copy;
1552 register int i, len = ip->ip_len;
1553
1554 /*
1555 * copy the old packet & pullup its IP header into the
1556 * new mbuf so we can modify it. Try to fill the new
1557 * mbuf since if we don't the ethernet driver will.
1558 */
1559 MGETHDR(mb_copy, M_DONTWAIT, MT_HEADER);
1560 if (mb_copy == NULL)
1561 return;
1562 mb_copy->m_data += max_linkhdr;
1563 mb_copy->m_len = sizeof(multicast_encap_iphdr);
1564
1565 if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1566 m_freem(mb_copy);
1567 return;
1568 }
1569 i = MHLEN - M_LEADINGSPACE(mb_copy);
1570 if (i > len)
1571 i = len;
1572 mb_copy = m_pullup(mb_copy, i);
1573 if (mb_copy == NULL)
1574 return;
1575 mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr);
1576
1577 /*
1578 * fill in the encapsulating IP header.
1579 */
1580 ip_copy = mtod(mb_copy, struct ip *);
1581 *ip_copy = multicast_encap_iphdr;
1582 ip_copy->ip_id = htons(ip_id++);
1583 ip_copy->ip_len += len;
1584 ip_copy->ip_src = vifp->v_lcl_addr;
1585 ip_copy->ip_dst = vifp->v_rmt_addr;
1586
1587 /*
1588 * turn the encapsulated IP header back into a valid one.
1589 */
1590 ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr));
1591 --ip->ip_ttl;
1592 HTONS(ip->ip_len);
1593 HTONS(ip->ip_off);
1594 ip->ip_sum = 0;
1595 mb_copy->m_data += sizeof(multicast_encap_iphdr);
1596 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2);
1597 mb_copy->m_data -= sizeof(multicast_encap_iphdr);
1598
1599 if (vifp->v_rate_limit == 0)
1600 tbf_send_packet(vifp, mb_copy);
1601 else
1602 tbf_control(vifp, mb_copy, ip, ip_copy->ip_len);
1603}
1604
1605/*
1606 * De-encapsulate a packet and feed it back through ip input (this
1607 * routine is called whenever IP gets a packet with proto type
1608 * ENCAP_PROTO and a local destination address).
1609 */
1610void
1611#ifdef MROUTE_LKM
1612X_ipip_input(m, iphlen)
1613#else
1614ipip_input(m, iphlen)
1615#endif
1616 register struct mbuf *m;
1617 int iphlen;
1618{
1619 struct ifnet *ifp = m->m_pkthdr.rcvif;
1620 register struct ip *ip = mtod(m, struct ip *);
1621 register int hlen = ip->ip_hl << 2;
1622 register int s;
1623 register struct ifqueue *ifq;
1624 register struct vif *vifp;
1625
1626 if (!have_encap_tunnel) {
1627 rip_input(m, iphlen);
1628 return;
1629 }
1630 /*
1631 * dump the packet if it's not to a multicast destination or if
1632 * we don't have an encapsulating tunnel with the source.
1633 * Note: This code assumes that the remote site IP address
1634 * uniquely identifies the tunnel (i.e., that this site has
1635 * at most one tunnel with the remote site).
1636 */
1637 if (! IN_MULTICAST(ntohl(((struct ip *)((char *)ip + hlen))->ip_dst.s_addr))) {
1638 ++mrtstat.mrts_bad_tunnel;
1639 m_freem(m);
1640 return;
1641 }
1642 if (ip->ip_src.s_addr != last_encap_src) {
1643 register struct vif *vife;
1644
1645 vifp = viftable;
1646 vife = vifp + numvifs;
1647 last_encap_src = ip->ip_src.s_addr;
1648 last_encap_vif = 0;
1649 for ( ; vifp < vife; ++vifp)
1650 if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) {
1651 if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT))
1652 == VIFF_TUNNEL)
1653 last_encap_vif = vifp;
1654 break;
1655 }
1656 }
1657 if ((vifp = last_encap_vif) == 0) {
1658 last_encap_src = 0;
1659 mrtstat.mrts_cant_tunnel++; /*XXX*/
1660 m_freem(m);
1661 if (mrtdebug)
1662 log(LOG_DEBUG, "ip_mforward: no tunnel with %lx\n",
1663 (u_long)ntohl(ip->ip_src.s_addr));
1664 return;
1665 }
1666 ifp = vifp->v_ifp;
1667
1668 if (hlen > IP_HDR_LEN)
1669 ip_stripoptions(m, (struct mbuf *) 0);
1670 m->m_data += IP_HDR_LEN;
1671 m->m_len -= IP_HDR_LEN;
1672 m->m_pkthdr.len -= IP_HDR_LEN;
1673 m->m_pkthdr.rcvif = ifp;
1674
1675 ifq = &ipintrq;
1676 s = splimp();
1677 if (IF_QFULL(ifq)) {
1678 IF_DROP(ifq);
1679 m_freem(m);
1680 } else {
1681 IF_ENQUEUE(ifq, m);
1682 /*
1683 * normally we would need a "schednetisr(NETISR_IP)"
1684 * here but we were called by ip_input and it is going
1685 * to loop back & try to dequeue the packet we just
1686 * queued as soon as we return so we avoid the
1687 * unnecessary software interrrupt.
1688 */
1689 }
1690 splx(s);
1691}
1692
1693/*
1694 * Token bucket filter module
1695 */
1696
1697static void
1698tbf_control(vifp, m, ip, p_len)
1699 register struct vif *vifp;
1700 register struct mbuf *m;
1701 register struct ip *ip;
1702 register u_long p_len;
1703{
1704 register struct tbf *t = vifp->v_tbf;
1705
1706 if (p_len > MAX_BKT_SIZE) {
1707 /* drop if packet is too large */
1708 mrtstat.mrts_pkt2large++;
1709 m_freem(m);
1710 return;
1711 }
1712
1713 tbf_update_tokens(vifp);
1714
1715 /* if there are enough tokens,
1716 * and the queue is empty,
1717 * send this packet out
1718 */
1719
1720 if (t->tbf_q_len == 0) {
1721 /* queue empty, send packet if enough tokens */
1722 if (p_len <= t->tbf_n_tok) {
1723 t->tbf_n_tok -= p_len;
1724 tbf_send_packet(vifp, m);
1725 } else {
1726 /* queue packet and timeout till later */
1727 tbf_queue(vifp, m);
1728 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS);
1729 }
1730 } else if (t->tbf_q_len < t->tbf_max_q_len) {
1731 /* finite queue length, so queue pkts and process queue */
1732 tbf_queue(vifp, m);
1733 tbf_process_q(vifp);
1734 } else {
1735 /* queue length too much, try to dq and queue and process */
1736 if (!tbf_dq_sel(vifp, ip)) {
1737 mrtstat.mrts_q_overflow++;
1738 m_freem(m);
1739 return;
1740 } else {
1741 tbf_queue(vifp, m);
1742 tbf_process_q(vifp);
1743 }
1744 }
1745 return;
1746}
1747
1748/*
1749 * adds a packet to the queue at the interface
1750 */
1751static void
1752tbf_queue(vifp, m)
1753 register struct vif *vifp;
1754 register struct mbuf *m;
1755{
1756 register int s = splnet();
1757 register struct tbf *t = vifp->v_tbf;
1758
1759 if (t->tbf_t == NULL) {
1760 /* Queue was empty */
1761 t->tbf_q = m;
1762 } else {
1763 /* Insert at tail */
1764 t->tbf_t->m_act = m;
1765 }
1766
1767 /* Set new tail pointer */
1768 t->tbf_t = m;
1769
1770#ifdef DIAGNOSTIC
1771 /* Make sure we didn't get fed a bogus mbuf */
1772 if (m->m_act)
1773 panic("tbf_queue: m_act");
1774#endif
1775 m->m_act = NULL;
1776
1777 t->tbf_q_len++;
1778
1779 splx(s);
1780}
1781
1782
1783/*
1784 * processes the queue at the interface
1785 */
1786static void
1787tbf_process_q(vifp)
1788 register struct vif *vifp;
1789{
1790 register struct mbuf *m;
1791 register int len;
1792 register int s = splnet();
1793 register struct tbf *t = vifp->v_tbf;
1794
1795 /* loop through the queue at the interface and send as many packets
1796 * as possible
1797 */
1798 while (t->tbf_q_len > 0) {
1799 m = t->tbf_q;
1800
1801 len = mtod(m, struct ip *)->ip_len;
1802
1803 /* determine if the packet can be sent */
1804 if (len <= t->tbf_n_tok) {
1805 /* if so,
1806 * reduce no of tokens, dequeue the packet,
1807 * send the packet.
1808 */
1809 t->tbf_n_tok -= len;
1810
1811 t->tbf_q = m->m_act;
1812 if (--t->tbf_q_len == 0)
1813 t->tbf_t = NULL;
1814
1815 m->m_act = NULL;
1816 tbf_send_packet(vifp, m);
1817
1818 } else break;
1819 }
1820 splx(s);
1821}
1822
1823static void
1824tbf_reprocess_q(xvifp)
1825 void *xvifp;
1826{
1827 register struct vif *vifp = xvifp;
1828 if (ip_mrouter == NULL)
1829 return;
1830
1831 tbf_update_tokens(vifp);
1832
1833 tbf_process_q(vifp);
1834
1835 if (vifp->v_tbf->tbf_q_len)
1836 timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS);
1837}
1838
1839/* function that will selectively discard a member of the queue
1840 * based on the precedence value and the priority
1841 */
1842static int
1843tbf_dq_sel(vifp, ip)
1844 register struct vif *vifp;
1845 register struct ip *ip;
1846{
1847 register int s = splnet();
1848 register u_int p;
1849 register struct mbuf *m, *last;
1850 register struct mbuf **np;
1851 register struct tbf *t = vifp->v_tbf;
1852
1853 p = priority(vifp, ip);
1854
1855 np = &t->tbf_q;
1856 last = NULL;
1857 while ((m = *np) != NULL) {
1858 if (p > priority(vifp, mtod(m, struct ip *))) {
1859 *np = m->m_act;
1860 /* If we're removing the last packet, fix the tail pointer */
1861 if (m == t->tbf_t)
1862 t->tbf_t = last;
1863 m_freem(m);
1864 /* it's impossible for the queue to be empty, but
1865 * we check anyway. */
1866 if (--t->tbf_q_len == 0)
1867 t->tbf_t = NULL;
1868 splx(s);
1869 mrtstat.mrts_drop_sel++;
1870 return(1);
1871 }
1872 np = &m->m_act;
1873 last = m;
1874 }
1875 splx(s);
1876 return(0);
1877}
1878
1879static void
1880tbf_send_packet(vifp, m)
1881 register struct vif *vifp;
1882 register struct mbuf *m;
1883{
1884 struct ip_moptions imo;
1885 int error;
1886 static struct route ro;
1887 int s = splnet();
1888
1889 if (vifp->v_flags & VIFF_TUNNEL) {
1890 /* If tunnel options */
1891 ip_output(m, (struct mbuf *)0, &vifp->v_route,
1892 IP_FORWARDING, (struct ip_moptions *)0);
1893 } else {
1894 imo.imo_multicast_ifp = vifp->v_ifp;
1895 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1;
1896 imo.imo_multicast_loop = 1;
1897 imo.imo_multicast_vif = -1;
1898
1899 /*
1900 * Re-entrancy should not be a problem here, because
1901 * the packets that we send out and are looped back at us
1902 * should get rejected because they appear to come from
1903 * the loopback interface, thus preventing looping.
1904 */
1905 error = ip_output(m, (struct mbuf *)0, &ro,
1906 IP_FORWARDING, &imo);
1907
1908 if (mrtdebug & DEBUG_XMIT)
1909 log(LOG_DEBUG, "phyint_send on vif %d err %d\n",
1910 vifp - viftable, error);
1911 }
1912 splx(s);
1913}
1914
1915/* determine the current time and then
1916 * the elapsed time (between the last time and time now)
1917 * in milliseconds & update the no. of tokens in the bucket
1918 */
1919static void
1920tbf_update_tokens(vifp)
1921 register struct vif *vifp;
1922{
1923 struct timeval tp;
1924 register u_long tm;
1925 register int s = splnet();
1926 register struct tbf *t = vifp->v_tbf;
1927
1928 GET_TIME(tp);
1929
1930 TV_DELTA(tp, t->tbf_last_pkt_t, tm);
1931
1932 /*
1933 * This formula is actually
1934 * "time in seconds" * "bytes/second".
1935 *
1936 * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8)
1937 *
1938 * The (1000/1024) was introduced in add_vif to optimize
1939 * this divide into a shift.
1940 */
1941 t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8;
1942 t->tbf_last_pkt_t = tp;
1943
1944 if (t->tbf_n_tok > MAX_BKT_SIZE)
1945 t->tbf_n_tok = MAX_BKT_SIZE;
1946
1947 splx(s);
1948}
1949
1950static int
1951priority(vifp, ip)
1952 register struct vif *vifp;
1953 register struct ip *ip;
1954{
1955 register int prio;
1956
1957 /* temporary hack; may add general packet classifier some day */
1958
1959 /*
1960 * The UDP port space is divided up into four priority ranges:
1961 * [0, 16384) : unclassified - lowest priority
1962 * [16384, 32768) : audio - highest priority
1963 * [32768, 49152) : whiteboard - medium priority
1964 * [49152, 65536) : video - low priority
1965 */
1966 if (ip->ip_p == IPPROTO_UDP) {
1967 struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2));
1968 switch (ntohs(udp->uh_dport) & 0xc000) {
1969 case 0x4000:
1970 prio = 70;
1971 break;
1972 case 0x8000:
1973 prio = 60;
1974 break;
1975 case 0xc000:
1976 prio = 55;
1977 break;
1978 default:
1979 prio = 50;
1980 break;
1981 }
1982 if (tbfdebug > 1)
1983 log(LOG_DEBUG, "port %x prio%d\n", ntohs(udp->uh_dport), prio);
1984 } else {
1985 prio = 50;
1986 }
1987 return prio;
1988}
1989
1990/*
1991 * End of token bucket filter modifications
1992 */
1993
1994int
1995ip_rsvp_vif_init(so, sopt)
1996 struct socket *so;
1997 struct sockopt *sopt;
1998{
1999 int error, i, s;
2000
2001 if (rsvpdebug)
2002 printf("ip_rsvp_vif_init: so_type = %d, pr_protocol = %d\n",
2003 so->so_type, so->so_proto->pr_protocol);
2004
2005 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP)
2006 return EOPNOTSUPP;
2007
2008 /* Check mbuf. */
2009 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
2010 if (error)
2011 return (error);
2012
2013 if (rsvpdebug)
2014 printf("ip_rsvp_vif_init: vif = %d rsvp_on = %d\n", i, rsvp_on);
2015
2016 s = splnet();
2017
2018 /* Check vif. */
2019 if (!legal_vif_num(i)) {
2020 splx(s);
2021 return EADDRNOTAVAIL;
2022 }
2023
2024 /* Check if socket is available. */
2025 if (viftable[i].v_rsvpd != NULL) {
2026 splx(s);
2027 return EADDRINUSE;
2028 }
2029
2030 viftable[i].v_rsvpd = so;
2031 /* This may seem silly, but we need to be sure we don't over-increment
2032 * the RSVP counter, in case something slips up.
2033 */
2034 if (!viftable[i].v_rsvp_on) {
2035 viftable[i].v_rsvp_on = 1;
2036 rsvp_on++;
2037 }
2038
2039 splx(s);
2040 return 0;
2041}
2042
2043int
2044ip_rsvp_vif_done(so, sopt)
2045 struct socket *so;
2046 struct sockopt *sopt;
2047{
2048 int error, i, s;
2049
2050 if (rsvpdebug)
2051 printf("ip_rsvp_vif_done: so_type = %d, pr_protocol = %d\n",
2052 so->so_type, so->so_proto->pr_protocol);
2053
2054 if (so->so_type != SOCK_RAW ||
2055 so->so_proto->pr_protocol != IPPROTO_RSVP)
2056 return EOPNOTSUPP;
2057
2058 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
2059 if (error)
2060 return (error);
2061
2062 s = splnet();
2063
2064 /* Check vif. */
2065 if (!legal_vif_num(i)) {
2066 splx(s);
2067 return EADDRNOTAVAIL;
2068 }
2069
2070 if (rsvpdebug)
2071 printf("ip_rsvp_vif_done: v_rsvpd = %p so = %p\n",
2072 viftable[i].v_rsvpd, so);
2073
2074 viftable[i].v_rsvpd = NULL;
2075 /*
2076 * This may seem silly, but we need to be sure we don't over-decrement
2077 * the RSVP counter, in case something slips up.
2078 */
2079 if (viftable[i].v_rsvp_on) {
2080 viftable[i].v_rsvp_on = 0;
2081 rsvp_on--;
2082 }
2083
2084 splx(s);
2085 return 0;
2086}
2087
2088void
2089ip_rsvp_force_done(so)
2090 struct socket *so;
2091{
2092 int vifi;
2093 register int s;
2094
2095 /* Don't bother if it is not the right type of socket. */
2096 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP)
2097 return;
2098
2099 s = splnet();
2100
2101 /* The socket may be attached to more than one vif...this
2102 * is perfectly legal.
2103 */
2104 for (vifi = 0; vifi < numvifs; vifi++) {
2105 if (viftable[vifi].v_rsvpd == so) {
2106 viftable[vifi].v_rsvpd = NULL;
2107 /* This may seem silly, but we need to be sure we don't
2108 * over-decrement the RSVP counter, in case something slips up.
2109 */
2110 if (viftable[vifi].v_rsvp_on) {
2111 viftable[vifi].v_rsvp_on = 0;
2112 rsvp_on--;
2113 }
2114 }
2115 }
2116
2117 splx(s);
2118 return;
2119}
2120
2121void
2122rsvp_input(m, iphlen)
2123 struct mbuf *m;
2124 int iphlen;
2125{
2126 int vifi;
2127 register struct ip *ip = mtod(m, struct ip *);
2128 static struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET };
2129 register int s;
2130 struct ifnet *ifp;
2131
2132 if (rsvpdebug)
2133 printf("rsvp_input: rsvp_on %d\n",rsvp_on);
2134
2135 /* Can still get packets with rsvp_on = 0 if there is a local member
2136 * of the group to which the RSVP packet is addressed. But in this
2137 * case we want to throw the packet away.
2138 */
2139 if (!rsvp_on) {
2140 m_freem(m);
2141 return;
2142 }
2143
2144 /* If the old-style non-vif-associated socket is set, then use
2145 * it and ignore the new ones.
2146 */
2147 if (ip_rsvpd != NULL) {
2148 if (rsvpdebug)
2149 printf("rsvp_input: Sending packet up old-style socket\n");
2150 rip_input(m, iphlen);
2151 return;
2152 }
2153
2154 s = splnet();
2155
2156 if (rsvpdebug)
2157 printf("rsvp_input: check vifs\n");
2158
2159#ifdef DIAGNOSTIC
2160 if (!(m->m_flags & M_PKTHDR))
2161 panic("rsvp_input no hdr");
2162#endif
2163
2164 ifp = m->m_pkthdr.rcvif;
2165 /* Find which vif the packet arrived on. */
2166 for (vifi = 0; vifi < numvifs; vifi++) {
2167 if (viftable[vifi].v_ifp == ifp)
2168 break;
2169 }
2170
2171 if (vifi == numvifs) {
2172 /* Can't find vif packet arrived on. Drop packet. */
2173 if (rsvpdebug)
2174 printf("rsvp_input: Can't find vif for packet...dropping it.\n");
2175 m_freem(m);
2176 splx(s);
2177 return;
2178 }
2179
2180 if (rsvpdebug)
2181 printf("rsvp_input: check socket\n");
2182
2183 if (viftable[vifi].v_rsvpd == NULL) {
2184 /* drop packet, since there is no specific socket for this
2185 * interface */
2186 if (rsvpdebug)
2187 printf("rsvp_input: No socket defined for vif %d\n",vifi);
2188 m_freem(m);
2189 splx(s);
2190 return;
2191 }
2192 rsvp_src.sin_addr = ip->ip_src;
2193
2194 if (rsvpdebug && m)
2195 printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n",
2196 m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv)));
2197
2198 if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) {
2199 if (rsvpdebug)
2200 printf("rsvp_input: Failed to append to socket\n");
2201 } else {
2202 if (rsvpdebug)
2203 printf("rsvp_input: send packet up\n");
2204 }
2205
2206 splx(s);
2207}
2208
2209#ifdef MROUTE_LKM
2210#include <sys/conf.h>
2211#include <sys/exec.h>
2212#include <sys/sysent.h>
2213#include <sys/lkm.h>
2214
2215MOD_MISC("ip_mroute_mod")
2216
2217static int
2218ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd)
2219{
2220 int i;
2221 struct lkm_misc *args = lkmtp->private.lkm_misc;
2222 int err = 0;
2223
2224 switch(cmd) {
2225 static int (*old_ip_mrouter_cmd)();
2226 static int (*old_ip_mrouter_done)();
2227 static int (*old_ip_mforward)();
2228 static int (*old_mrt_ioctl)();
2229 static void (*old_proto4_input)();
2230 static int (*old_legal_vif_num)();
2231 extern struct protosw inetsw[];
2232
2233 case LKM_E_LOAD:
2234 if(lkmexists(lkmtp) || ip_mrtproto)
2235 return(EEXIST);
2236 old_ip_mrouter_cmd = ip_mrouter_cmd;
2237 ip_mrouter_cmd = X_ip_mrouter_cmd;
2238 old_ip_mrouter_done = ip_mrouter_done;
2239 ip_mrouter_done = X_ip_mrouter_done;
2240 old_ip_mforward = ip_mforward;
2241 ip_mforward = X_ip_mforward;
2242 old_mrt_ioctl = mrt_ioctl;
2243 mrt_ioctl = X_mrt_ioctl;
2244 old_proto4_input = inetsw[ip_protox[ENCAP_PROTO]].pr_input;
2245 inetsw[ip_protox[ENCAP_PROTO]].pr_input = X_ipip_input;
2246 old_legal_vif_num = legal_vif_num;
2247 legal_vif_num = X_legal_vif_num;
2248 ip_mrtproto = IGMP_DVMRP;
2249
2250 printf("\nIP multicast routing loaded\n");
2251 break;
2252
2253 case LKM_E_UNLOAD:
2254 if (ip_mrouter)
2255 return EINVAL;
2256
2257 ip_mrouter_cmd = old_ip_mrouter_cmd;
2258 ip_mrouter_done = old_ip_mrouter_done;
2259 ip_mforward = old_ip_mforward;
2260 mrt_ioctl = old_mrt_ioctl;
2261 inetsw[ip_protox[ENCAP_PROTO]].pr_input = old_proto4_input;
2262 legal_vif_num = old_legal_vif_num;
2263 ip_mrtproto = 0;
2264 break;
2265
2266 default:
2267 err = EINVAL;
2268 break;
2269 }
2270
2271 return(err);
2272}
2273
2274int
2275ip_mroute_mod(struct lkm_table *lkmtp, int cmd, int ver) {
2276 DISPATCH(lkmtp, cmd, ver, ip_mroute_mod_handle, ip_mroute_mod_handle,
2277 nosys);
2278}
2279
2280#endif /* MROUTE_LKM */
2281#endif /* MROUTING */