1 /* $NetBSD: vif.c,v 1.6 1995/12/10 10:07:19 mycroft Exp $ */
2
3 /*
4 * The mrouted program is covered by the license in the accompanying file
5 * named "LICENSE". Use of the mrouted program represents acceptance of
6 * the terms and conditions listed in that file.
7 *
8 * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
9 * Leland Stanford Junior University.
10 */
11
12
13 #include "defs.h"
14 #include <fcntl.h>
15
16 /*
17 * Exported variables.
18 */
19 struct uvif uvifs[MAXVIFS]; /* array of virtual interfaces */
20 vifi_t numvifs; /* number of vifs in use */
21 int vifs_down; /* 1=>some interfaces are down */
22 int phys_vif; /* An enabled vif */
23 int udp_socket; /* Since the honkin' kernel doesn't support */
24 /* ioctls on raw IP sockets, we need a UDP */
25 /* socket as well as our IGMP (raw) socket. */
26 /* How dumb. */
27 int vifs_with_neighbors; /* == 1 if I am a leaf */
28
29 typedef struct {
30 vifi_t vifi;
31 struct listaddr *g;
32 int q_time;
33 } cbk_t;
34
35 /*
36 * Forward declarations.
37 */
38 static void start_vif(vifi_t vifi);
39 static void start_vif2(vifi_t vifi);
40 static void stop_vif(vifi_t vifi);
41 static void age_old_hosts(void);
42 static void send_probe_on_vif(struct uvif *v);
43 static int info_version(char *p, int);
44 static void DelVif(void *arg);
45 static int SetTimer(int vifi, struct listaddr *g);
46 static int DeleteTimer(int id);
47 static void SendQuery(void *arg);
48 static int SetQueryTimer(struct listaddr *g, vifi_t vifi, int to_expire,
49 int q_time);
50
51
52 /*
53 * Initialize the virtual interfaces, but do not install
54 * them in the kernel. Start routing on all vifs that are
55 * not down or disabled.
56 */
57 void
init_vifs(void)58 init_vifs(void)
59 {
60 vifi_t vifi;
61 struct uvif *v;
62 int enabled_vifs, enabled_phyints;
63 extern char *configfilename;
64
65 numvifs = 0;
66 vifs_with_neighbors = 0;
67 vifs_down = FALSE;
68
69 /*
70 * Configure the vifs based on the interface configuration of the
71 * the kernel and the contents of the configuration file.
72 * (Open a UDP socket for ioctl use in the config procedures.)
73 */
74 if ((udp_socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
75 logit(LOG_ERR, errno, "UDP socket");
76 logit(LOG_INFO,0,"Getting vifs from kernel interfaces");
77 config_vifs_from_kernel();
78 logit(LOG_INFO,0,"Getting vifs from %s",configfilename);
79 config_vifs_from_file();
80
81 /*
82 * Quit if there are fewer than two enabled vifs.
83 */
84 enabled_vifs = 0;
85 enabled_phyints = 0;
86 phys_vif = -1;
87 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
88 if (!(v->uv_flags & VIFF_DISABLED)) {
89 ++enabled_vifs;
90 if (!(v->uv_flags & VIFF_TUNNEL)) {
91 if (phys_vif == -1)
92 phys_vif = vifi;
93 ++enabled_phyints;
94 }
95 }
96 }
97 if (enabled_vifs < 2)
98 logit(LOG_ERR, 0, "can't forward: %s",
99 enabled_vifs == 0 ? "no enabled vifs" : "only one enabled vif");
100
101 if (enabled_phyints == 0)
102 logit(LOG_WARNING, 0,
103 "no enabled interfaces, forwarding via tunnels only");
104
105 logit(LOG_INFO, 0, "Installing vifs in mrouted...");
106 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
107 if (!(v->uv_flags & VIFF_DISABLED)) {
108 if (!(v->uv_flags & VIFF_DOWN)) {
109 if (v->uv_flags & VIFF_TUNNEL)
110 logit(LOG_INFO, 0, "vif #%d, tunnel %s -> %s", vifi,
111 inet_fmt(v->uv_lcl_addr, s1),
112 inet_fmt(v->uv_rmt_addr, s2));
113 else
114 logit(LOG_INFO, 0, "vif #%d, phyint %s", vifi,
115 inet_fmt(v->uv_lcl_addr, s1));
116 start_vif2(vifi);
117 } else logit(LOG_INFO, 0,
118 "%s is not yet up; vif #%u not in service",
119 v->uv_name, vifi);
120 }
121 }
122 }
123
124 /*
125 * Start routing on all virtual interfaces that are not down or
126 * administratively disabled.
127 */
128 void
init_installvifs(void)129 init_installvifs(void)
130 {
131 vifi_t vifi;
132 struct uvif *v;
133
134 logit(LOG_INFO, 0, "Installing vifs in kernel...");
135 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
136 if (!(v->uv_flags & VIFF_DISABLED)) {
137 if (!(v->uv_flags & VIFF_DOWN)) {
138 if (v->uv_flags & VIFF_TUNNEL)
139 logit(LOG_INFO, 0, "vif #%d, tunnel %s -> %s", vifi,
140 inet_fmt(v->uv_lcl_addr, s1),
141 inet_fmt(v->uv_rmt_addr, s2));
142 else
143 logit(LOG_INFO, 0, "vif #%d, phyint %s", vifi,
144 inet_fmt(v->uv_lcl_addr, s1));
145 k_add_vif(vifi, &uvifs[vifi]);
146 } else logit(LOG_INFO, 0,
147 "%s is not yet up; vif #%u not in service",
148 v->uv_name, vifi);
149 }
150 }
151 }
152
153 /*
154 * See if any interfaces have changed from up state to down, or vice versa,
155 * including any non-multicast-capable interfaces that are in use as local
156 * tunnel end-points. Ignore interfaces that have been administratively
157 * disabled.
158 */
159 void
check_vif_state(void)160 check_vif_state(void)
161 {
162 register vifi_t vifi;
163 register struct uvif *v;
164 struct ifreq ifr;
165
166 vifs_down = FALSE;
167 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
168
169 if (v->uv_flags & VIFF_DISABLED) continue;
170
171 strncpy(ifr.ifr_name, v->uv_name, IFNAMSIZ);
172 if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ifr) < 0)
173 logit(LOG_ERR, errno,
174 "ioctl SIOCGIFFLAGS for %s", ifr.ifr_name);
175
176 if (v->uv_flags & VIFF_DOWN) {
177 if (ifr.ifr_flags & IFF_UP) {
178 v->uv_flags &= ~VIFF_DOWN;
179 start_vif(vifi);
180 logit(LOG_INFO, 0,
181 "%s has come up; vif #%u now in service",
182 v->uv_name, vifi);
183 }
184 else vifs_down = TRUE;
185 }
186 else {
187 if (!(ifr.ifr_flags & IFF_UP)) {
188 stop_vif(vifi);
189 v->uv_flags |= VIFF_DOWN;
190 logit(LOG_INFO, 0,
191 "%s has gone down; vif #%u taken out of service",
192 v->uv_name, vifi);
193 vifs_down = TRUE;
194 }
195 }
196 }
197 }
198
199 /*
200 * Send a probe message on vif v
201 */
202 static void
send_probe_on_vif(struct uvif * v)203 send_probe_on_vif(struct uvif *v)
204 {
205 register char *p;
206 register int datalen = 0;
207 struct listaddr *nbr;
208 int i;
209
210 p = send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN;
211
212 for (i = 0; i < 4; i++)
213 *p++ = ((char *)&(dvmrp_genid))[i];
214 datalen += 4;
215
216 /*
217 * add the neighbor list on the interface to the message
218 */
219 nbr = v->uv_neighbors;
220
221 while (nbr) {
222 for (i = 0; i < 4; i++)
223 *p++ = ((char *)&nbr->al_addr)[i];
224 datalen +=4;
225 nbr = nbr->al_next;
226 }
227
228 send_igmp(v->uv_lcl_addr,
229 (v->uv_flags & VIFF_TUNNEL) ? v->uv_rmt_addr
230 : dvmrp_group,
231 IGMP_DVMRP, DVMRP_PROBE,
232 htonl(MROUTED_LEVEL |
233 ((v->uv_flags & VIFF_LEAF) ? 0 : LEAF_FLAGS)),
234 datalen);
235 }
236
237 /*
238 * Add a vifi to the kernel and start routing on it.
239 */
240 static void
start_vif(vifi_t vifi)241 start_vif(vifi_t vifi)
242 {
243 /*
244 * Install the interface in the kernel's vif structure.
245 */
246 k_add_vif(vifi, &uvifs[vifi]);
247
248 start_vif2(vifi);
249 }
250
251 /*
252 * Add a vifi to all the user-level data structures but don't add
253 * it to the kernel yet.
254 */
255 static void
start_vif2(vifi_t vifi)256 start_vif2(vifi_t vifi)
257 {
258 struct uvif *v;
259 u_int32_t src;
260 struct phaddr *p;
261
262 v = &uvifs[vifi];
263 src = v->uv_lcl_addr;
264
265 /*
266 * Update the existing route entries to take into account the new vif.
267 */
268 add_vif_to_routes(vifi);
269
270 if (!(v->uv_flags & VIFF_TUNNEL)) {
271 /*
272 * Join the DVMRP multicast group on the interface.
273 * (This is not strictly necessary, since the kernel promiscuously
274 * receives IGMP packets addressed to ANY IP multicast group while
275 * multicast routing is enabled. However, joining the group allows
276 * this host to receive non-IGMP packets as well, such as 'pings'.)
277 */
278 k_join(dvmrp_group, src);
279
280 /*
281 * Join the ALL-ROUTERS multicast group on the interface.
282 * This allows mtrace requests to loop back if they are run
283 * on the multicast router.
284 */
285 k_join(allrtrs_group, src);
286
287 /*
288 * Install an entry in the routing table for the subnet to which
289 * the interface is connected.
290 */
291 start_route_updates();
292 update_route(v->uv_subnet, v->uv_subnetmask, 0, 0, vifi);
293 for (p = v->uv_addrs; p; p = p->pa_next) {
294 start_route_updates();
295 update_route(p->pa_subnet, p->pa_subnetmask, 0, 0, vifi);
296 }
297
298 /*
299 * Until neighbors are discovered, assume responsibility for sending
300 * periodic group membership queries to the subnet. Send the first
301 * query.
302 */
303 v->uv_flags |= VIFF_QUERIER;
304 send_igmp(src, allhosts_group, IGMP_HOST_MEMBERSHIP_QUERY,
305 (v->uv_flags & VIFF_IGMPV1) ? 0 :
306 IGMP_MAX_HOST_REPORT_DELAY * IGMP_TIMER_SCALE, 0, 0);
307 age_old_hosts();
308 }
309
310 v->uv_leaf_timer = LEAF_CONFIRMATION_TIME;
311
312 /*
313 * Send a probe via the new vif to look for neighbors.
314 */
315 send_probe_on_vif(v);
316 }
317
318 /*
319 * Stop routing on the specified virtual interface.
320 */
321 static void
stop_vif(vifi_t vifi)322 stop_vif(vifi_t vifi)
323 {
324 struct uvif *v;
325 struct listaddr *a;
326 struct phaddr *p;
327
328 v = &uvifs[vifi];
329
330 if (!(v->uv_flags & VIFF_TUNNEL)) {
331 /*
332 * Depart from the DVMRP multicast group on the interface.
333 */
334 k_leave(dvmrp_group, v->uv_lcl_addr);
335
336 /*
337 * Depart from the ALL-ROUTERS multicast group on the interface.
338 */
339 k_leave(allrtrs_group, v->uv_lcl_addr);
340
341 /*
342 * Update the entry in the routing table for the subnet to which
343 * the interface is connected, to take into account the interface
344 * failure.
345 */
346 start_route_updates();
347 update_route(v->uv_subnet, v->uv_subnetmask, UNREACHABLE, 0, vifi);
348 for (p = v->uv_addrs; p; p = p->pa_next) {
349 start_route_updates();
350 update_route(p->pa_subnet, p->pa_subnetmask, UNREACHABLE, 0, vifi);
351 }
352
353 /*
354 * Discard all group addresses. (No need to tell kernel;
355 * the k_del_vif() call, below, will clean up kernel state.)
356 */
357 while (v->uv_groups != NULL) {
358 a = v->uv_groups;
359 v->uv_groups = a->al_next;
360 free((char *)a);
361 }
362
363 v->uv_flags &= ~VIFF_QUERIER;
364 }
365
366 /*
367 * Update the existing route entries to take into account the vif failure.
368 */
369 delete_vif_from_routes(vifi);
370
371 /*
372 * Delete the interface from the kernel's vif structure.
373 */
374 k_del_vif(vifi);
375
376 /*
377 * Discard all neighbor addresses.
378 */
379 if (v->uv_neighbors)
380 vifs_with_neighbors--;
381
382 while (v->uv_neighbors != NULL) {
383 a = v->uv_neighbors;
384 v->uv_neighbors = a->al_next;
385 free((char *)a);
386 }
387 }
388
389
390 /*
391 * stop routing on all vifs
392 */
393 void
stop_all_vifs(void)394 stop_all_vifs(void)
395 {
396 vifi_t vifi;
397 struct uvif *v;
398 struct listaddr *a;
399 struct vif_acl *acl;
400
401 for (vifi = 0; vifi < numvifs; vifi++) {
402 v = &uvifs[vifi];
403 while (v->uv_groups != NULL) {
404 a = v->uv_groups;
405 v->uv_groups = a->al_next;
406 free((char *)a);
407 }
408 while (v->uv_neighbors != NULL) {
409 a = v->uv_neighbors;
410 v->uv_neighbors = a->al_next;
411 free((char *)a);
412 }
413 while (v->uv_acl != NULL) {
414 acl = v->uv_acl;
415 v->uv_acl = acl->acl_next;
416 free((char *)acl);
417 }
418 }
419 }
420
421
422 /*
423 * Find the virtual interface from which an incoming packet arrived,
424 * based on the packet's source and destination IP addresses.
425 */
426 vifi_t
find_vif(u_int32_t src,u_int32_t dst)427 find_vif(u_int32_t src, u_int32_t dst)
428 {
429 register vifi_t vifi;
430 register struct uvif *v;
431 register struct phaddr *p;
432
433 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
434 if (!(v->uv_flags & (VIFF_DOWN|VIFF_DISABLED))) {
435 if (v->uv_flags & VIFF_TUNNEL) {
436 if (src == v->uv_rmt_addr && dst == v->uv_lcl_addr)
437 return(vifi);
438 }
439 else {
440 if ((src & v->uv_subnetmask) == v->uv_subnet &&
441 ((v->uv_subnetmask == 0xffffffff) ||
442 (src != v->uv_subnetbcast)))
443 return(vifi);
444 for (p=v->uv_addrs; p; p=p->pa_next) {
445 if ((src & p->pa_subnetmask) == p->pa_subnet &&
446 ((p->pa_subnetmask == 0xffffffff) ||
447 (src != p->pa_subnetbcast)))
448 return(vifi);
449 }
450 }
451 }
452 }
453 return (NO_VIF);
454 }
455
456 static void
age_old_hosts(void)457 age_old_hosts(void)
458 {
459 register vifi_t vifi;
460 register struct uvif *v;
461 register struct listaddr *g;
462
463 /*
464 * Decrement the old-hosts-present timer for each
465 * active group on each vif.
466 */
467 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++)
468 for (g = v->uv_groups; g != NULL; g = g->al_next)
469 if (g->al_old)
470 g->al_old--;
471 }
472
473
474 /*
475 * Send group membership queries to all subnets for which I am querier.
476 */
477 void
query_groups(void)478 query_groups(void)
479 {
480 register vifi_t vifi;
481 register struct uvif *v;
482
483 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
484 if (v->uv_flags & VIFF_QUERIER) {
485 send_igmp(v->uv_lcl_addr, allhosts_group,
486 IGMP_HOST_MEMBERSHIP_QUERY,
487 (v->uv_flags & VIFF_IGMPV1) ? 0 :
488 IGMP_MAX_HOST_REPORT_DELAY * IGMP_TIMER_SCALE, 0, 0);
489 }
490 }
491 age_old_hosts();
492 }
493
494 /*
495 * Process an incoming host membership query
496 */
497 void
accept_membership_query(u_int32_t src,u_int32_t dst,u_int32_t group,int tmo)498 accept_membership_query(u_int32_t src, u_int32_t dst, u_int32_t group,
499 int tmo)
500 {
501 register vifi_t vifi;
502 register struct uvif *v;
503
504 if ((vifi = find_vif(src, dst)) == NO_VIF ||
505 (uvifs[vifi].uv_flags & VIFF_TUNNEL)) {
506 logit(LOG_INFO, 0,
507 "ignoring group membership query from non-adjacent host %s",
508 inet_fmt(src, s1));
509 return;
510 }
511
512 v = &uvifs[vifi];
513
514 /*
515 * If we consider ourselves the querier for this vif, but hear a
516 * query from a router with a lower IP address, yield to them.
517 *
518 * This is done here as well as in the neighbor discovery in case
519 * there is a querier that doesn't speak DVMRP.
520 *
521 * XXX If this neighbor doesn't speak DVMRP, then we need to create
522 * some neighbor state for him so that we can time him out!
523 */
524 if ((v->uv_flags & VIFF_QUERIER) &&
525 (ntohl(src) < ntohl(v->uv_lcl_addr))) {
526 v->uv_flags &= ~VIFF_QUERIER;
527
528 }
529 }
530
531 /*
532 * Process an incoming group membership report.
533 */
534 void
accept_group_report(u_int32_t src,u_int32_t dst,u_int32_t group,int r_type)535 accept_group_report(u_int32_t src, u_int32_t dst, u_int32_t group,
536 int r_type)
537 {
538 register vifi_t vifi;
539 register struct uvif *v;
540 register struct listaddr *g;
541
542 if ((vifi = find_vif(src, dst)) == NO_VIF ||
543 (uvifs[vifi].uv_flags & VIFF_TUNNEL)) {
544 logit(LOG_INFO, 0,
545 "ignoring group membership report from non-adjacent host %s",
546 inet_fmt(src, s1));
547 return;
548 }
549
550 v = &uvifs[vifi];
551
552 /*
553 * Look for the group in our group list; if found, reset its timer.
554 */
555 for (g = v->uv_groups; g != NULL; g = g->al_next) {
556 if (group == g->al_addr) {
557 if (r_type == IGMP_v1_HOST_MEMBERSHIP_REPORT)
558 g->al_old = OLD_AGE_THRESHOLD;
559
560 /** delete old timers, set a timer for expiration **/
561 g->al_timer = GROUP_EXPIRE_TIME;
562 if (g->al_query)
563 g->al_query = DeleteTimer(g->al_query);
564 if (g->al_timerid)
565 g->al_timerid = DeleteTimer(g->al_timerid);
566 g->al_timerid = SetTimer(vifi, g);
567 break;
568 }
569 }
570
571 /*
572 * If not found, add it to the list and update kernel cache.
573 */
574 if (g == NULL) {
575 g = (struct listaddr *)malloc(sizeof(struct listaddr));
576 if (g == NULL)
577 logit(LOG_ERR, 0, "ran out of memory"); /* fatal */
578
579 g->al_addr = group;
580 if (r_type == IGMP_v2_HOST_MEMBERSHIP_REPORT)
581 g->al_old = 0;
582 else
583 g->al_old = OLD_AGE_THRESHOLD;
584
585 /** set a timer for expiration **/
586 g->al_query = 0;
587 g->al_timer = GROUP_EXPIRE_TIME;
588 time(&g->al_ctime);
589 g->al_timerid = SetTimer(vifi, g);
590 g->al_next = v->uv_groups;
591 v->uv_groups = g;
592
593 update_lclgrp(vifi, group);
594 }
595
596 /*
597 * Check if a graft is necessary for this group
598 */
599 chkgrp_graft(vifi, group);
600 }
601
602
603 void
accept_leave_message(u_int32_t src,u_int32_t dst,u_int32_t group)604 accept_leave_message(u_int32_t src, u_int32_t dst, u_int32_t group)
605 {
606 register vifi_t vifi;
607 register struct uvif *v;
608 register struct listaddr *g;
609
610 if ((vifi = find_vif(src, dst)) == NO_VIF ||
611 (uvifs[vifi].uv_flags & VIFF_TUNNEL)) {
612 logit(LOG_INFO, 0,
613 "ignoring group leave report from non-adjacent host %s",
614 inet_fmt(src, s1));
615 return;
616 }
617
618 v = &uvifs[vifi];
619
620 if (!(v->uv_flags & VIFF_QUERIER) || (v->uv_flags & VIFF_IGMPV1))
621 return;
622
623 /*
624 * Look for the group in our group list in order to set up a short-timeout
625 * query.
626 */
627 for (g = v->uv_groups; g != NULL; g = g->al_next) {
628 if (group == g->al_addr) {
629 logit(LOG_DEBUG, 0,
630 "[vif.c, _accept_leave_message] %d %d \n",
631 g->al_old, g->al_query);
632
633 /* Ignore the leave message if there are old hosts present */
634 if (g->al_old)
635 return;
636
637 /* still waiting for a reply to a query, ignore the leave */
638 if (g->al_query)
639 return;
640
641 /** delete old timer set a timer for expiration **/
642 if (g->al_timerid)
643 g->al_timerid = DeleteTimer(g->al_timerid);
644
645 /** send a group specific querry **/
646 g->al_timer = LEAVE_EXPIRE_TIME;
647 send_igmp(v->uv_lcl_addr, g->al_addr,
648 IGMP_HOST_MEMBERSHIP_QUERY,
649 LEAVE_EXPIRE_TIME / 3 * IGMP_TIMER_SCALE,
650 g->al_addr, 0);
651 g->al_query = SetQueryTimer(g, vifi, g->al_timer / 3,
652 LEAVE_EXPIRE_TIME / 3 * IGMP_TIMER_SCALE);
653 g->al_timerid = SetTimer(vifi, g);
654 break;
655 }
656 }
657 }
658
659
660 /*
661 * Send a periodic probe on all vifs.
662 * Useful to determine one-way interfaces.
663 * Detect neighbor loss faster.
664 */
665 void
probe_for_neighbors(void)666 probe_for_neighbors(void)
667 {
668 register vifi_t vifi;
669 register struct uvif *v;
670
671 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
672 if (!(v->uv_flags & (VIFF_DOWN|VIFF_DISABLED))) {
673 send_probe_on_vif(v);
674 }
675 }
676 }
677
678
679 /*
680 * Send a list of all of our neighbors to the requestor, `src'.
681 */
682 void
accept_neighbor_request(u_int32_t src,u_int32_t dst)683 accept_neighbor_request(u_int32_t src, u_int32_t dst)
684 {
685 vifi_t vifi;
686 struct uvif *v;
687 u_char *p, *ncount;
688 struct listaddr *la;
689 int datalen;
690 u_int32_t temp_addr, us, them = src;
691
692 /* Determine which of our addresses to use as the source of our response
693 * to this query.
694 */
695 if (IN_MULTICAST(ntohl(dst))) { /* query sent to a multicast group */
696 int udp; /* find best interface to reply on */
697 struct sockaddr_in addr;
698 int addrlen = sizeof(addr);
699
700 memset(&addr, 0, sizeof addr);
701 addr.sin_family = AF_INET;
702 #if (defined(BSD) && (BSD >= 199103))
703 addr.sin_len = sizeof addr;
704 #endif
705 addr.sin_addr.s_addr = dst;
706 addr.sin_port = htons(2000); /* any port over 1024 will do... */
707 if ((udp = socket(AF_INET, SOCK_DGRAM, 0)) < 0
708 || connect(udp, (struct sockaddr *) &addr, sizeof(addr)) < 0
709 || getsockname(udp, (struct sockaddr *) &addr, &addrlen) < 0) {
710 logit(LOG_WARNING, errno, "Determining local address");
711 close(udp);
712 return;
713 }
714 close(udp);
715 us = addr.sin_addr.s_addr;
716 } else /* query sent to us alone */
717 us = dst;
718
719 #define PUT_ADDR(a) temp_addr = ntohl(a); \
720 *p++ = temp_addr >> 24; \
721 *p++ = (temp_addr >> 16) & 0xFF; \
722 *p++ = (temp_addr >> 8) & 0xFF; \
723 *p++ = temp_addr & 0xFF;
724
725 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
726 datalen = 0;
727
728 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
729 if (v->uv_flags & VIFF_DISABLED)
730 continue;
731
732 ncount = 0;
733
734 for (la = v->uv_neighbors; la; la = la->al_next) {
735
736 /* Make sure that there's room for this neighbor... */
737 if (datalen + (ncount == 0 ? 4 + 3 + 4 : 4) > MAX_DVMRP_DATA_LEN) {
738 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS,
739 htonl(MROUTED_LEVEL), datalen);
740 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
741 datalen = 0;
742 ncount = 0;
743 }
744
745 /* Put out the header for this neighbor list... */
746 if (ncount == 0) {
747 PUT_ADDR(v->uv_lcl_addr);
748 *p++ = v->uv_metric;
749 *p++ = v->uv_threshold;
750 ncount = p;
751 *p++ = 0;
752 datalen += 4 + 3;
753 }
754
755 PUT_ADDR(la->al_addr);
756 datalen += 4;
757 (*ncount)++;
758 }
759 }
760
761 if (datalen != 0)
762 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS, htonl(MROUTED_LEVEL),
763 datalen);
764 }
765
766 /*
767 * Send a list of all of our neighbors to the requestor, `src'.
768 */
769 void
accept_neighbor_request2(u_int32_t src,u_int32_t dst)770 accept_neighbor_request2(u_int32_t src, u_int32_t dst)
771 {
772 vifi_t vifi;
773 struct uvif *v;
774 u_char *p, *ncount;
775 struct listaddr *la;
776 int datalen;
777 u_int32_t us, them = src;
778
779 /* Determine which of our addresses to use as the source of our response
780 * to this query.
781 */
782 if (IN_MULTICAST(ntohl(dst))) { /* query sent to a multicast group */
783 int udp; /* find best interface to reply on */
784 struct sockaddr_in addr;
785 int addrlen = sizeof(addr);
786
787 memset(&addr, 0, sizeof addr);
788 addr.sin_family = AF_INET;
789 #if (defined(BSD) && (BSD >= 199103))
790 addr.sin_len = sizeof addr;
791 #endif
792 addr.sin_addr.s_addr = dst;
793 addr.sin_port = htons(2000); /* any port over 1024 will do... */
794 if ((udp = socket(AF_INET, SOCK_DGRAM, 0)) < 0
795 || connect(udp, (struct sockaddr *) &addr, sizeof(addr)) < 0
796 || getsockname(udp, (struct sockaddr *) &addr, &addrlen) < 0) {
797 logit(LOG_WARNING, errno, "Determining local address");
798 close(udp);
799 return;
800 }
801 close(udp);
802 us = addr.sin_addr.s_addr;
803 } else /* query sent to us alone */
804 us = dst;
805
806 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
807 datalen = 0;
808
809 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
810 register u_short vflags = v->uv_flags;
811 register u_char rflags = 0;
812 if (vflags & VIFF_TUNNEL)
813 rflags |= DVMRP_NF_TUNNEL;
814 if (vflags & VIFF_SRCRT)
815 rflags |= DVMRP_NF_SRCRT;
816 if (vflags & VIFF_DOWN)
817 rflags |= DVMRP_NF_DOWN;
818 if (vflags & VIFF_DISABLED)
819 rflags |= DVMRP_NF_DISABLED;
820 if (vflags & VIFF_QUERIER)
821 rflags |= DVMRP_NF_QUERIER;
822 if (vflags & VIFF_LEAF)
823 rflags |= DVMRP_NF_LEAF;
824 ncount = 0;
825 la = v->uv_neighbors;
826 if (la == NULL) {
827 /*
828 * include down & disabled interfaces and interfaces on
829 * leaf nets.
830 */
831 if (rflags & DVMRP_NF_TUNNEL)
832 rflags |= DVMRP_NF_DOWN;
833 if (datalen > MAX_DVMRP_DATA_LEN - 12) {
834 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS2,
835 htonl(MROUTED_LEVEL), datalen);
836 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
837 datalen = 0;
838 }
839 *(u_int*)p = v->uv_lcl_addr;
840 p += 4;
841 *p++ = v->uv_metric;
842 *p++ = v->uv_threshold;
843 *p++ = rflags;
844 *p++ = 1;
845 *(u_int*)p = v->uv_rmt_addr;
846 p += 4;
847 datalen += 12;
848 } else {
849 for ( ; la; la = la->al_next) {
850 /* Make sure that there's room for this neighbor... */
851 if (datalen + (ncount == 0 ? 4+4+4 : 4) > MAX_DVMRP_DATA_LEN) {
852 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS2,
853 htonl(MROUTED_LEVEL), datalen);
854 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
855 datalen = 0;
856 ncount = 0;
857 }
858 /* Put out the header for this neighbor list... */
859 if (ncount == 0) {
860 *(u_int*)p = v->uv_lcl_addr;
861 p += 4;
862 *p++ = v->uv_metric;
863 *p++ = v->uv_threshold;
864 *p++ = rflags;
865 ncount = p;
866 *p++ = 0;
867 datalen += 4 + 4;
868 }
869 *(u_int*)p = la->al_addr;
870 p += 4;
871 datalen += 4;
872 (*ncount)++;
873 }
874 }
875 }
876 if (datalen != 0)
877 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS2, htonl(MROUTED_LEVEL),
878 datalen);
879 }
880
881 void
accept_info_request(u_int32_t src,u_int32_t dst,u_char * p,int datalen)882 accept_info_request(u_int32_t src, u_int32_t dst, u_char *p, int datalen)
883 {
884 u_char *q;
885 int len;
886 int outlen = 0;
887
888 q = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
889
890 /* To be general, this must deal properly with breaking up over-sized
891 * packets. That implies passing a length to each function, and
892 * allowing each function to request to be called again. Right now,
893 * we're only implementing the one thing we are positive will fit into
894 * a single packet, so we wimp out.
895 */
896 while (datalen > 0) {
897 len = 0;
898 switch (*p) {
899 case DVMRP_INFO_VERSION:
900 len = info_version(q, (u_char *)send_buf + RECV_BUF_SIZE - q);
901 break;
902
903 case DVMRP_INFO_NEIGHBORS:
904 default:
905 logit(LOG_INFO, 0, "ignoring unknown info type %d", *p);
906 break;
907 }
908 *(q+1) = len++;
909 outlen += len * 4;
910 q += len * 4;
911 len = (*(p+1) + 1) * 4;
912 p += len;
913 datalen -= len;
914 }
915
916 if (outlen != 0)
917 send_igmp(INADDR_ANY, src, IGMP_DVMRP, DVMRP_INFO_REPLY,
918 htonl(MROUTED_LEVEL), outlen);
919 }
920
921 /*
922 * Information response -- return version string
923 */
924 static int
info_version(char * p,int len)925 info_version(char *p, int len)
926 {
927 extern char versionstring[];
928
929 if (len < 5)
930 return (0);
931 *p++ = DVMRP_INFO_VERSION;
932 p++; /* skip over length */
933 *p++ = 0; /* zero out */
934 *p++ = 0; /* reserved fields */
935 strlcpy(p, versionstring, len - 4);
936
937 len = strlen(p);
938 return ((len + 3) / 4);
939 }
940
941 /*
942 * Process an incoming neighbor-list message.
943 */
944 void
accept_neighbors(u_int32_t src,u_int32_t dst,u_char * p,int datalen,u_int32_t level)945 accept_neighbors(u_int32_t src, u_int32_t dst, u_char *p, int datalen,
946 u_int32_t level)
947 {
948 logit(LOG_INFO, 0, "ignoring spurious DVMRP neighbor list from %s to %s",
949 inet_fmt(src, s1), inet_fmt(dst, s2));
950 }
951
952
953 /*
954 * Process an incoming neighbor-list message.
955 */
956 void
accept_neighbors2(u_int32_t src,u_int32_t dst,u_char * p,int datalen,u_int32_t level)957 accept_neighbors2(u_int32_t src, u_int32_t dst, u_char *p, int datalen,
958 u_int32_t level)
959 {
960 logit(LOG_INFO, 0, "ignoring spurious DVMRP neighbor list2 from %s to %s",
961 inet_fmt(src, s1), inet_fmt(dst, s2));
962 }
963
964 /*
965 * Process an incoming info reply message.
966 */
967 void
accept_info_reply(u_int32_t src,u_int32_t dst,u_char * p,int datalen)968 accept_info_reply(u_int32_t src, u_int32_t dst, u_char *p, int datalen)
969 {
970 logit(LOG_INFO, 0, "ignoring spurious DVMRP info reply from %s to %s",
971 inet_fmt(src, s1), inet_fmt(dst, s2));
972 }
973
974
975 /*
976 * Update the neighbor entry for neighbor 'addr' on vif 'vifi'.
977 * 'msgtype' is the type of DVMRP message received from the neighbor.
978 * Return TRUE if 'addr' is a valid neighbor, FALSE otherwise.
979 */
980 int
update_neighbor(vifi_t vifi,u_int32_t addr,int msgtype,char * p,int datalen,u_int32_t level)981 update_neighbor(vifi_t vifi, u_int32_t addr, int msgtype, char *p,
982 int datalen, u_int32_t level)
983 {
984 register struct uvif *v;
985 register struct listaddr *n;
986 u_int32_t genid = 0;
987 u_int32_t router;
988 u_int32_t send_tables = 0;
989 int do_reset = FALSE;
990 int nflags;
991
992 v = &uvifs[vifi];
993 nflags = (level >> 16) & 0xff;
994
995 /*
996 * Confirm that 'addr' is a valid neighbor address on vif 'vifi'.
997 * IT IS ASSUMED that this was preceded by a call to find_vif(), which
998 * checks that 'addr' is either a valid remote tunnel endpoint or a
999 * non-broadcast address belonging to a directly-connected subnet.
1000 * Therefore, here we check only that 'addr' is not our own address
1001 * (due to an impostor or erroneous loopback) or an address of the form
1002 * {subnet,0} ("the unknown host"). These checks are not performed in
1003 * find_vif() because those types of address are acceptable for some
1004 * types of IGMP message (such as group membership reports).
1005 */
1006 if (!(v->uv_flags & VIFF_TUNNEL) &&
1007 (addr == v->uv_lcl_addr ||
1008 addr == v->uv_subnet )) {
1009 logit(LOG_WARNING, 0,
1010 "received DVMRP message from 'the unknown host' or self: %s",
1011 inet_fmt(addr, s1));
1012 return (FALSE);
1013 }
1014
1015 /*
1016 * Look for addr in list of neighbors.
1017 */
1018 for (n = v->uv_neighbors; n != NULL; n = n->al_next) {
1019 if (addr == n->al_addr) {
1020 break;
1021 }
1022 }
1023
1024 /*
1025 * Found it. Reset its timer, and check for a version change
1026 */
1027 if (n) {
1028 n->al_timer = 0;
1029
1030 /*
1031 * update the neighbors version and protocol number
1032 * if changed => router went down and came up,
1033 * so take action immediately.
1034 */
1035 if ((n->al_pv != (level & 0xff)) ||
1036 (n->al_mv != ((level >> 8) & 0xff))) {
1037
1038 do_reset = TRUE;
1039 logit(LOG_DEBUG, 0,
1040 "version change neighbor %s [old:%d.%d, new:%d.%d]",
1041 inet_fmt(addr, s1),
1042 n->al_pv, n->al_mv, level&0xff, (level >> 8) & 0xff);
1043
1044 n->al_pv = level & 0xff;
1045 n->al_mv = (level >> 8) & 0xff;
1046 }
1047 } else {
1048 /*
1049 * If not found, add it to the list. If the neighbor has a lower
1050 * IP address than me, yield querier duties to it.
1051 */
1052 logit(LOG_DEBUG, 0, "New neighbor %s on vif %d v%d.%d nf 0x%02x",
1053 inet_fmt(addr, s1), vifi, level & 0xff, (level >> 8) & 0xff,
1054 (level >> 16) & 0xff);
1055
1056 n = (struct listaddr *)malloc(sizeof(struct listaddr));
1057 if (n == NULL)
1058 logit(LOG_ERR, 0, "ran out of memory"); /* fatal */
1059
1060 n->al_addr = addr;
1061 n->al_pv = level & 0xff;
1062 n->al_mv = (level >> 8) & 0xff;
1063 n->al_genid = 0;
1064
1065 time(&n->al_ctime);
1066 n->al_timer = 0;
1067 n->al_next = v->uv_neighbors;
1068
1069 /*
1070 * If we thought that we had no neighbors on this vif, send a route
1071 * report to the vif. If this is just a new neighbor on the same
1072 * vif, send the route report just to the new neighbor.
1073 */
1074 if (v->uv_neighbors == NULL) {
1075 send_tables = (v->uv_flags & VIFF_TUNNEL) ? addr : dvmrp_group;
1076 vifs_with_neighbors++;
1077 } else {
1078 send_tables = addr;
1079 }
1080
1081 v->uv_neighbors = n;
1082
1083 if (!(v->uv_flags & VIFF_TUNNEL) &&
1084 ntohl(addr) < ntohl(v->uv_lcl_addr))
1085 v->uv_flags &= ~VIFF_QUERIER;
1086 }
1087
1088 /*
1089 * Check if the router gen-ids are the same.
1090 * Need to reset the prune state of the router if not.
1091 * Also check for one-way interfaces by seeing if we are in our
1092 * neighbor's list of known routers.
1093 */
1094 if (msgtype == DVMRP_PROBE) {
1095
1096 /* Check genid neighbor flag. Also check version number; 3.3 and
1097 * 3.4 didn't set this flag. */
1098 if ((((level >> 16) & 0xff) & NF_GENID) ||
1099 (((level & 0xff) == 3) && (((level >> 8) & 0xff) > 2))) {
1100
1101 int i;
1102
1103 if (datalen < 4) {
1104 logit(LOG_WARNING, 0,
1105 "received truncated probe message from %s (len %d)",
1106 inet_fmt(addr, s1), datalen);
1107 return (FALSE);
1108 }
1109
1110 for (i = 0; i < 4; i++)
1111 ((char *)&genid)[i] = *p++;
1112 datalen -= 4;
1113
1114 if (n->al_genid == 0)
1115 n->al_genid = genid;
1116 else if (n->al_genid != genid) {
1117 logit(LOG_DEBUG, 0,
1118 "new genid neigbor %s on vif %d [old:%x, new:%x]",
1119 inet_fmt(addr, s1), vifi, n->al_genid, genid);
1120
1121 n->al_genid = genid;
1122 do_reset = TRUE;
1123 }
1124
1125 /*
1126 * loop through router list and check for one-way ifs.
1127 */
1128
1129 v->uv_flags |= VIFF_ONEWAY;
1130
1131 while (datalen > 0) {
1132 if (datalen < 4) {
1133 logit(LOG_WARNING, 0,
1134 "received truncated probe message from %s (len %d)",
1135 inet_fmt(addr, s1), datalen);
1136 return (FALSE);
1137 }
1138 for (i = 0; i < 4; i++)
1139 ((char *)&router)[i] = *p++;
1140 datalen -= 4;
1141 if (router == v->uv_lcl_addr) {
1142 v->uv_flags &= ~VIFF_ONEWAY;
1143 break;
1144 }
1145 }
1146 }
1147 }
1148 if (n->al_flags != nflags) {
1149 n->al_flags = nflags;
1150
1151 if (n->al_flags & NF_LEAF) {
1152 /*XXX If we have non-leaf neighbors then we know we shouldn't
1153 * mark this vif as a leaf. For now we just count on other
1154 * probes and/or reports resetting the timer. */
1155 if (!v->uv_leaf_timer)
1156 v->uv_leaf_timer = LEAF_CONFIRMATION_TIME;
1157 } else {
1158 /* If we get a leaf to non-leaf transition, we *must* update
1159 * the routing table. */
1160 if (v->uv_flags & VIFF_LEAF && send_tables == 0)
1161 send_tables = addr;
1162 v->uv_flags &= ~VIFF_LEAF;
1163 v->uv_leaf_timer = 0;
1164 }
1165 }
1166 if (do_reset) {
1167 reset_neighbor_state(vifi, addr);
1168 if (!send_tables)
1169 send_tables = addr;
1170 }
1171 if (send_tables)
1172 report(ALL_ROUTES, vifi, send_tables);
1173
1174 return (TRUE);
1175 }
1176
1177
1178 /*
1179 * On every timer interrupt, advance the timer in each neighbor and
1180 * group entry on every vif.
1181 */
1182 void
age_vifs(void)1183 age_vifs(void)
1184 {
1185 register vifi_t vifi;
1186 register struct uvif *v;
1187 register struct listaddr *a, *prev_a, *n;
1188 register u_int32_t addr;
1189
1190 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v ) {
1191 if (v->uv_leaf_timer && (v->uv_leaf_timer -= TIMER_INTERVAL == 0)) {
1192 v->uv_flags |= VIFF_LEAF;
1193 }
1194
1195 for (prev_a = (struct listaddr *)&(v->uv_neighbors),
1196 a = v->uv_neighbors;
1197 a != NULL;
1198 prev_a = a, a = a->al_next) {
1199
1200 if ((a->al_timer += TIMER_INTERVAL) < NEIGHBOR_EXPIRE_TIME)
1201 continue;
1202
1203 /*
1204 * Neighbor has expired; delete it from the neighbor list,
1205 * delete it from the 'dominants' and 'subordinates arrays of
1206 * any route entries and assume querier duties unless there is
1207 * another neighbor with a lower IP address than mine.
1208 */
1209 addr = a->al_addr;
1210 prev_a->al_next = a->al_next;
1211 free((char *)a);
1212 a = prev_a;
1213
1214 delete_neighbor_from_routes(addr, vifi);
1215
1216 if (v->uv_neighbors == NULL)
1217 vifs_with_neighbors--;
1218
1219 v->uv_leaf_timer = LEAF_CONFIRMATION_TIME;
1220
1221 if (!(v->uv_flags & VIFF_TUNNEL)) {
1222 v->uv_flags |= VIFF_QUERIER;
1223 for (n = v->uv_neighbors; n != NULL; n = n->al_next) {
1224 if (ntohl(n->al_addr) < ntohl(v->uv_lcl_addr)) {
1225 v->uv_flags &= ~VIFF_QUERIER;
1226 }
1227 if (!(n->al_flags & NF_LEAF)) {
1228 v->uv_leaf_timer = 0;
1229 }
1230 }
1231 }
1232 }
1233 }
1234 }
1235
1236 /*
1237 * Returns the neighbor info struct for a given neighbor
1238 */
1239 struct listaddr *
neighbor_info(vifi_t vifi,u_int32_t addr)1240 neighbor_info(vifi_t vifi, u_int32_t addr)
1241 {
1242 struct listaddr *u;
1243
1244 for (u = uvifs[vifi].uv_neighbors; u; u = u->al_next)
1245 if (u->al_addr == addr)
1246 return u;
1247
1248 return NULL;
1249 }
1250
1251 /*
1252 * Print the contents of the uvifs array on file 'fp'.
1253 */
1254 void
dump_vifs(FILE * fp)1255 dump_vifs(FILE *fp)
1256 {
1257 register vifi_t vifi;
1258 register struct uvif *v;
1259 register struct listaddr *a;
1260 register struct phaddr *p;
1261 struct sioc_vif_req v_req;
1262
1263 fprintf(fp, "vifs_with_neighbors = %d\n", vifs_with_neighbors);
1264
1265 if (vifs_with_neighbors == 1)
1266 fprintf(fp,"[This host is a leaf]\n\n");
1267
1268 fprintf(fp,
1269 "\nVirtual Interface Table\n%s",
1270 "Vif Name Local-Address ");
1271 fprintf(fp,
1272 "M Thr Rate Flags\n");
1273
1274 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
1275
1276 fprintf(fp, "%2u %6s %-15s %6s: %-18s %2u %3u %5u ",
1277 vifi,
1278 v->uv_name,
1279 inet_fmt(v->uv_lcl_addr, s1),
1280 (v->uv_flags & VIFF_TUNNEL) ?
1281 "tunnel":
1282 "subnet",
1283 (v->uv_flags & VIFF_TUNNEL) ?
1284 inet_fmt(v->uv_rmt_addr, s2) :
1285 inet_fmts(v->uv_subnet, v->uv_subnetmask, s3),
1286 v->uv_metric,
1287 v->uv_threshold,
1288 v->uv_rate_limit);
1289
1290 if (v->uv_flags & VIFF_ONEWAY) fprintf(fp, " one-way");
1291 if (v->uv_flags & VIFF_DOWN) fprintf(fp, " down");
1292 if (v->uv_flags & VIFF_DISABLED) fprintf(fp, " disabled");
1293 if (v->uv_flags & VIFF_QUERIER) fprintf(fp, " querier");
1294 if (v->uv_flags & VIFF_SRCRT) fprintf(fp, " src-rt");
1295 if (v->uv_flags & VIFF_LEAF) fprintf(fp, " leaf");
1296 if (v->uv_flags & VIFF_IGMPV1) fprintf(fp, " IGMPv1");
1297 fprintf(fp, "\n");
1298
1299 if (v->uv_addrs != NULL) {
1300 fprintf(fp, " alternate subnets: %s\n",
1301 inet_fmts(v->uv_addrs->pa_subnet, v->uv_addrs->pa_subnetmask, s1));
1302 for (p = v->uv_addrs->pa_next; p; p = p->pa_next) {
1303 fprintf(fp, " %s\n",
1304 inet_fmts(p->pa_subnet, p->pa_subnetmask, s1));
1305 }
1306 }
1307
1308 if (v->uv_neighbors != NULL) {
1309 fprintf(fp, " peers: %s (%d.%d) (0x%x)\n",
1310 inet_fmt(v->uv_neighbors->al_addr, s1),
1311 v->uv_neighbors->al_pv, v->uv_neighbors->al_mv,
1312 v->uv_neighbors->al_flags);
1313 for (a = v->uv_neighbors->al_next; a != NULL; a = a->al_next) {
1314 fprintf(fp, " %s (%d.%d) (0x%x)\n",
1315 inet_fmt(a->al_addr, s1), a->al_pv, a->al_mv,
1316 a->al_flags);
1317 }
1318 }
1319
1320 if (v->uv_groups != NULL) {
1321 fprintf(fp, " groups: %-15s\n",
1322 inet_fmt(v->uv_groups->al_addr, s1));
1323 for (a = v->uv_groups->al_next; a != NULL; a = a->al_next) {
1324 fprintf(fp, " %-15s\n",
1325 inet_fmt(a->al_addr, s1));
1326 }
1327 }
1328 if (v->uv_acl != NULL) {
1329 struct vif_acl *acl;
1330
1331 fprintf(fp, " boundaries: %-18s\n",
1332 inet_fmts(v->uv_acl->acl_addr, v->uv_acl->acl_mask, s1));
1333 for (acl = v->uv_acl->acl_next; acl != NULL; acl = acl->acl_next) {
1334 fprintf(fp, " : %-18s\n",
1335 inet_fmts(acl->acl_addr, acl->acl_mask, s1));
1336 }
1337 }
1338 v_req.vifi = vifi;
1339 if (ioctl(udp_socket, SIOCGETVIFCNT, (char *)&v_req) < 0) {
1340 logit(LOG_WARNING, 0,
1341 "SIOCGETVIFCNT fails");
1342 }
1343 else {
1344 fprintf(fp, " pkts in : %ld\n",
1345 v_req.icount);
1346 fprintf(fp, " pkts out: %ld\n",
1347 v_req.ocount);
1348 }
1349 fprintf(fp, "\n");
1350 }
1351 fprintf(fp, "\n");
1352 }
1353
1354 /*
1355 * Time out record of a group membership on a vif
1356 */
1357 static void
DelVif(void * arg)1358 DelVif(void *arg)
1359 {
1360 cbk_t *cbk = (cbk_t *)arg;
1361 vifi_t vifi = cbk->vifi;
1362 struct uvif *v = &uvifs[vifi];
1363 struct listaddr *a, **anp, *g = cbk->g;
1364
1365 /*
1366 * Group has expired
1367 * delete all kernel cache entries with this group
1368 */
1369 if (g->al_query)
1370 DeleteTimer(g->al_query);
1371
1372 delete_lclgrp(vifi, g->al_addr);
1373
1374 anp = &(v->uv_groups);
1375 while ((a = *anp) != NULL) {
1376 if (a == g) {
1377 *anp = a->al_next;
1378 free((char *)a);
1379 } else {
1380 anp = &a->al_next;
1381 }
1382 }
1383
1384 free(cbk);
1385 }
1386
1387 /*
1388 * Set a timer to delete the record of a group membership on a vif.
1389 */
1390 static int
SetTimer(int vifi,struct listaddr * g)1391 SetTimer(int vifi, struct listaddr *g)
1392 {
1393 cbk_t *cbk;
1394
1395 cbk = (cbk_t *) malloc(sizeof(cbk_t));
1396 cbk->g = g;
1397 cbk->vifi = vifi;
1398 return timer_setTimer(g->al_timer, (cfunc_t)DelVif, (void *)cbk);
1399 }
1400
1401 /*
1402 * Delete a timer that was set above.
1403 */
1404 static int
DeleteTimer(int id)1405 DeleteTimer(int id)
1406 {
1407 timer_clearTimer(id);
1408 return 0;
1409 }
1410
1411 /*
1412 * Send a group-specific query.
1413 */
1414 static void
SendQuery(void * arg)1415 SendQuery(void *arg)
1416 {
1417 cbk_t *cbk = (cbk_t *)arg;
1418 register struct uvif *v = &uvifs[cbk->vifi];
1419
1420 send_igmp(v->uv_lcl_addr, cbk->g->al_addr,
1421 IGMP_HOST_MEMBERSHIP_QUERY,
1422 cbk->q_time, cbk->g->al_addr, 0);
1423 cbk->g->al_query = 0;
1424 free(cbk);
1425 }
1426
1427 /*
1428 * Set a timer to send a group-specific query.
1429 */
1430 static int
SetQueryTimer(struct listaddr * g,vifi_t vifi,int to_expire,int q_time)1431 SetQueryTimer(struct listaddr *g, vifi_t vifi, int to_expire, int q_time)
1432 {
1433 cbk_t *cbk;
1434
1435 cbk = (cbk_t *) malloc(sizeof(cbk_t));
1436 cbk->g = g;
1437 cbk->q_time = q_time;
1438 cbk->vifi = vifi;
1439 return timer_setTimer(to_expire, (cfunc_t)SendQuery, (void *)cbk);
1440 }
1441