1: /*
2: * The mrouted program is covered by the license in the accompanying file
3: * named "LICENSE". Use of the mrouted program represents acceptance of
4: * the terms and conditions listed in that file.
5: *
6: * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
7: * Leland Stanford Junior University.
8: */
9:
10: #include "defs.h"
11: #include <fcntl.h>
12:
13: /*
14: * Exported variables.
15: */
16: struct uvif uvifs[MAXVIFS]; /* array of virtual interfaces */
17: vifi_t numvifs; /* number of vifs in use */
18: int vifs_down; /* 1=>some interfaces are down */
19: int phys_vif; /* An enabled vif */
20: int udp_socket; /* Since the honkin' kernel doesn't support */
21: /* ioctls on raw IP sockets, we need a UDP */
22: /* socket as well as our IGMP (raw) socket. */
23: /* How dumb. */
24: int vifs_with_neighbors; /* == 1 if I am a leaf */
25:
26: /*
27: * Private variables.
28: */
29: struct listaddr *nbrs[MAXNBRS]; /* array of neighbors */
30:
31: typedef struct {
32: vifi_t vifi;
33: struct listaddr *g;
34: int q_time;
35: } cbk_t;
36:
37: /*
38: * Forward declarations.
39: */
40: static void start_vif(vifi_t vifi);
41: static void start_vif2(vifi_t vifi);
42: static void stop_vif(vifi_t vifi);
43: static void age_old_hosts(void);
44: static void send_probe_on_vif(struct uvif *v);
45: static void send_query(struct uvif *v);
46: static int info_version(u_char *p);
47: static void DelVif(void *arg);
48: static int SetTimer(vifi_t vifi, struct listaddr *g);
49: static int DeleteTimer(int id);
50: static void SendQuery(void *arg);
51: static int SetQueryTimer(struct listaddr *g, vifi_t vifi, int to_expire, int q_time);
52:
53: /*
54: * Initialize the virtual interfaces, but do not install
55: * them in the kernel. Start routing on all vifs that are
56: * not down or disabled.
57: */
58: void 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 if
73: * the kernel can't handle IOCTL's on the IGMP socket.)
74: */
75: #ifdef IOCTL_OK_ON_RAW_SOCKET
76: udp_socket = igmp_socket;
77: #else
78: if ((udp_socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
79: logit(LOG_ERR, errno, "UDP socket");
80: #endif
81: logit(LOG_INFO,0,"Getting vifs from kernel interfaces");
82: config_vifs_from_kernel();
83: logit(LOG_INFO,0,"Getting vifs from %s",configfilename);
84: config_vifs_from_file();
85:
86: /*
87: * Quit if there are fewer than two enabled vifs.
88: */
89: enabled_vifs = 0;
90: enabled_phyints = 0;
91: phys_vif = -1;
92: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
93: if (!(v->uv_flags & VIFF_DISABLED)) {
94: ++enabled_vifs;
95: if (!(v->uv_flags & VIFF_TUNNEL)) {
96: if (phys_vif == -1)
97: phys_vif = vifi;
98: ++enabled_phyints;
99: }
100: }
101: }
102: if (enabled_vifs < 2)
103: logit(LOG_ERR, 0, "Cannot forward: %s",
104: enabled_vifs == 0 ? "no enabled vifs" : "only one enabled vif");
105:
106: if (enabled_phyints == 0)
107: logit(LOG_WARNING, 0, "No enabled interfaces, forwarding via tunnels only");
108:
109: logit(LOG_INFO, 0, "Installing vifs in mrouted...");
110: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
111: if (!(v->uv_flags & VIFF_DISABLED)) {
112: if (!(v->uv_flags & VIFF_DOWN)) {
113: if (v->uv_flags & VIFF_TUNNEL)
114: logit(LOG_INFO, 0, "vif #%d, tunnel %s -> %s", vifi,
115: inet_fmt(v->uv_lcl_addr, s1, sizeof(s1)),
116: inet_fmt(v->uv_rmt_addr, s2, sizeof(s2)));
117: else
118: logit(LOG_INFO, 0, "vif #%d, phyint %s", vifi,
119: inet_fmt(v->uv_lcl_addr, s1, sizeof(s1)));
120: start_vif2(vifi);
121: } else logit(LOG_INFO, 0,
122: "%s is not yet up; vif #%u not in service",
123: v->uv_name, vifi);
124: }
125: }
126: }
127:
128: /*
129: * Initialize the passed vif with all appropriate default values.
130: * "t" is true if a tunnel, or false if a phyint.
131: */
132: void zero_vif(struct uvif *v, int t)
133: {
134: v->uv_flags = 0;
135: v->uv_metric = DEFAULT_METRIC;
136: v->uv_admetric = 0;
137: v->uv_threshold = DEFAULT_THRESHOLD;
138: v->uv_rate_limit = t ? DEFAULT_TUN_RATE_LIMIT : DEFAULT_PHY_RATE_LIMIT;
139: v->uv_lcl_addr = 0;
140: v->uv_rmt_addr = 0;
141: v->uv_dst_addr = t ? 0 : dvmrp_group;
142: v->uv_subnet = 0;
143: v->uv_subnetmask = 0;
144: v->uv_subnetbcast = 0;
145: v->uv_name[0] = '\0';
146: v->uv_groups = NULL;
147: v->uv_neighbors = NULL;
148: NBRM_CLRALL(v->uv_nbrmap);
149: v->uv_querier = NULL;
150: v->uv_igmpv1_warn = 0;
151: v->uv_prune_lifetime = 0;
152: v->uv_leaf_timer = 0;
153: v->uv_acl = NULL;
154: v->uv_addrs = NULL;
155: v->uv_filter = NULL;
156: v->uv_blasterbuf = NULL;
157: v->uv_blastercur = NULL;
158: v->uv_blasterend = NULL;
159: v->uv_blasterlen = 0;
160: v->uv_blastertimer = 0;
161: v->uv_nbrup = 0;
162: v->uv_icmp_warn = 0;
163: v->uv_nroutes = 0;
164: }
165:
166: /*
167: * Start routing on all virtual interfaces that are not down or
168: * administratively disabled.
169: */
170: void init_installvifs(void)
171: {
172: vifi_t vifi;
173: struct uvif *v;
174:
175: logit(LOG_INFO, 0, "Installing vifs in kernel...");
176: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
177: if (!(v->uv_flags & VIFF_DISABLED)) {
178: if (!(v->uv_flags & VIFF_DOWN)) {
179: if (v->uv_flags & VIFF_TUNNEL) {
180: logit(LOG_INFO, 0, "vif #%d, tunnel %s -> %s", vifi,
181: inet_fmt(v->uv_lcl_addr, s1, sizeof(s1)),
182: inet_fmt(v->uv_rmt_addr, s2, sizeof(s2)));
183: } else {
184: logit(LOG_INFO, 0, "vif #%d, phyint %s", vifi,
185: inet_fmt(v->uv_lcl_addr, s1, sizeof(s1)));
186: }
187: k_add_vif(vifi, &uvifs[vifi]);
188: } else {
189: logit(LOG_INFO, 0, "%s is not yet up; vif #%u not in service",
190: v->uv_name, vifi);
191: }
192: }
193: }
194: }
195:
196: /*
197: * See if any interfaces have changed from up state to down, or vice versa,
198: * including any non-multicast-capable interfaces that are in use as local
199: * tunnel end-points. Ignore interfaces that have been administratively
200: * disabled.
201: */
202: void check_vif_state(void)
203: {
204: register vifi_t vifi;
205: register struct uvif *v;
206: struct ifreq ifr;
207: static int checking_vifs = 0;
208:
209: /*
210: * If we get an error while checking, (e.g. two interfaces go down
211: * at once, and we decide to send a prune out one of the failed ones)
212: * then don't go into an infinite loop!
213: */
214: if (checking_vifs)
215: return;
216:
217: vifs_down = FALSE;
218: checking_vifs = 1;
219: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
220:
221: if (v->uv_flags & VIFF_DISABLED) continue;
222:
223: strncpy(ifr.ifr_name, v->uv_name, IFNAMSIZ);
224: if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ifr) < 0)
225: logit(LOG_ERR, errno, "Failed ioctl SIOCGIFFLAGS for %s", ifr.ifr_name);
226:
227: if (v->uv_flags & VIFF_DOWN) {
228: if (ifr.ifr_flags & IFF_UP) {
229: logit(LOG_NOTICE, 0, "%s has come up; vif #%u now in service",
230: v->uv_name, vifi);
231: v->uv_flags &= ~VIFF_DOWN;
232: start_vif(vifi);
233: }
234: else vifs_down = TRUE;
235: }
236: else {
237: if (!(ifr.ifr_flags & IFF_UP)) {
238: logit(LOG_NOTICE, 0, "%s has gone down; vif #%u taken out of service",
239: v->uv_name, vifi);
240: stop_vif(vifi);
241: v->uv_flags |= VIFF_DOWN;
242: vifs_down = TRUE;
243: }
244: }
245: }
246: checking_vifs = 0;
247: }
248:
249: /*
250: * Send a DVMRP message on the specified vif. If DVMRP messages are
251: * to be encapsulated and sent "inside" the tunnel, use the special
252: * encapsulator. If it's not a tunnel or DVMRP messages are to be
253: * sent "beside" the tunnel, as required by earlier versions of mrouted,
254: * then just send the message.
255: */
256: void send_on_vif(struct uvif *v, u_int32 dst, int code, size_t datalen)
257: {
258: u_int32 group = htonl(MROUTED_LEVEL |
259: ((v->uv_flags & VIFF_LEAF) ? 0 : LEAF_FLAGS));
260:
261: /*
262: * The UNIX kernel will not decapsulate unicasts.
263: * Therefore, we don't send encapsulated unicasts.
264: */
265: if ((v->uv_flags & (VIFF_TUNNEL|VIFF_OTUNNEL)) == VIFF_TUNNEL &&
266: ((dst == 0) || IN_MULTICAST(ntohl(dst))))
267: send_ipip(v->uv_lcl_addr, dst ? dst : dvmrp_group, IGMP_DVMRP,
268: code, group, datalen, v);
269: else
270: send_igmp(v->uv_lcl_addr, dst ? dst : v->uv_dst_addr, IGMP_DVMRP,
271: code, group, datalen);
272: }
273:
274:
275: /*
276: * Send a probe message on vif v
277: */
278: static void send_probe_on_vif(struct uvif *v)
279: {
280: char *p;
281: size_t datalen = 0;
282: struct listaddr *nbr;
283: int i;
284:
285: if ((v->uv_flags & VIFF_PASSIVE && v->uv_neighbors == NULL) ||
286: (v->uv_flags & VIFF_FORCE_LEAF))
287: return;
288:
289: p = send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN;
290:
291: for (i = 0; i < 4; i++)
292: *p++ = ((char *)&(dvmrp_genid))[i];
293: datalen += 4;
294:
295: /*
296: * add the neighbor list on the interface to the message
297: */
298: nbr = v->uv_neighbors;
299:
300: while (nbr) {
301: for (i = 0; i < 4; i++)
302: *p++ = ((char *)&nbr->al_addr)[i];
303: datalen +=4;
304: nbr = nbr->al_next;
305: }
306:
307: send_on_vif(v, 0, DVMRP_PROBE, datalen);
308: }
309:
310: static void send_query(struct uvif *v)
311: {
312: IF_DEBUG(DEBUG_IGMP) {
313: logit(LOG_DEBUG, 0, "Sending %squery on vif %d",
314: (v->uv_flags & VIFF_IGMPV1) ? "v1 " : "",
315: v - uvifs);
316: }
317:
318: send_igmp(v->uv_lcl_addr, allhosts_group,
319: IGMP_MEMBERSHIP_QUERY,
320: (v->uv_flags & VIFF_IGMPV1) ? 0 :
321: IGMP_MAX_HOST_REPORT_DELAY * IGMP_TIMER_SCALE, 0, 0);
322: }
323:
324: /*
325: * Add a vifi to the kernel and start routing on it.
326: */
327: static void start_vif(vifi_t vifi)
328: {
329: /*
330: * Install the interface in the kernel's vif structure.
331: */
332: k_add_vif(vifi, &uvifs[vifi]);
333:
334: start_vif2(vifi);
335: }
336:
337: /*
338: * Add a vifi to all the user-level data structures but don't add
339: * it to the kernel yet.
340: */
341: static void start_vif2(vifi_t vifi)
342: {
343: struct uvif *v;
344: u_int32 src;
345: struct phaddr *p;
346:
347: v = &uvifs[vifi];
348: src = v->uv_lcl_addr;
349:
350: /*
351: * Update the existing route entries to take into account the new vif.
352: */
353: add_vif_to_routes(vifi);
354:
355: if (!(v->uv_flags & VIFF_TUNNEL)) {
356: /*
357: * Join the DVMRP multicast group on the interface.
358: * (This is not strictly necessary, since the kernel promiscuously
359: * receives IGMP packets addressed to ANY IP multicast group while
360: * multicast routing is enabled. However, joining the group allows
361: * this host to receive non-IGMP packets as well, such as 'pings'.)
362: */
363: k_join(dvmrp_group, src);
364:
365: /*
366: * Join the ALL-ROUTERS multicast group on the interface.
367: * This allows mtrace requests to loop back if they are run
368: * on the multicast router.
369: */
370: k_join(allrtrs_group, src);
371:
372: /*
373: * Install an entry in the routing table for the subnet to which
374: * the interface is connected.
375: */
376: start_route_updates();
377: update_route(v->uv_subnet, v->uv_subnetmask, 0, 0, vifi, NULL);
378: for (p = v->uv_addrs; p; p = p->pa_next) {
379: start_route_updates();
380: update_route(p->pa_subnet, p->pa_subnetmask, 0, 0, vifi, NULL);
381: }
382:
383: /*
384: * Until neighbors are discovered, assume responsibility for sending
385: * periodic group membership queries to the subnet. Send the first
386: * query.
387: */
388: v->uv_flags |= VIFF_QUERIER;
389: IF_DEBUG(DEBUG_IGMP) {
390: logit(LOG_DEBUG, 0, "Assuming querier duties on vif %d", vifi);
391: }
392: send_query(v);
393: }
394:
395: v->uv_leaf_timer = LEAF_CONFIRMATION_TIME;
396:
397: /*
398: * Send a probe via the new vif to look for neighbors.
399: */
400: send_probe_on_vif(v);
401: }
402:
403: /*
404: * Stop routing on the specified virtual interface.
405: */
406: static void stop_vif(vifi_t vifi)
407: {
408: struct uvif *v;
409: struct listaddr *a;
410: struct phaddr *p;
411:
412: v = &uvifs[vifi];
413:
414: if (!(v->uv_flags & VIFF_TUNNEL)) {
415: /*
416: * Depart from the DVMRP multicast group on the interface.
417: */
418: k_leave(dvmrp_group, v->uv_lcl_addr);
419:
420: /*
421: * Depart from the ALL-ROUTERS multicast group on the interface.
422: */
423: k_leave(allrtrs_group, v->uv_lcl_addr);
424:
425: /*
426: * Update the entry in the routing table for the subnet to which
427: * the interface is connected, to take into account the interface
428: * failure.
429: */
430: start_route_updates();
431: update_route(v->uv_subnet, v->uv_subnetmask, UNREACHABLE, 0, vifi, NULL);
432: for (p = v->uv_addrs; p; p = p->pa_next) {
433: start_route_updates();
434: update_route(p->pa_subnet, p->pa_subnetmask, UNREACHABLE, 0, vifi, NULL);
435: }
436:
437: /*
438: * Discard all group addresses. (No need to tell kernel;
439: * the k_del_vif() call, below, will clean up kernel state.)
440: */
441: while (v->uv_groups != NULL) {
442: a = v->uv_groups;
443: v->uv_groups = a->al_next;
444: free((char *)a);
445: }
446:
447: IF_DEBUG(DEBUG_IGMP) {
448: logit(LOG_DEBUG, 0, "Releasing querier duties on vif %d", vifi);
449: }
450: v->uv_flags &= ~VIFF_QUERIER;
451: }
452:
453: /*
454: * Update the existing route entries to take into account the vif failure.
455: */
456: delete_vif_from_routes(vifi);
457:
458: /*
459: * Delete the interface from the kernel's vif structure.
460: */
461: k_del_vif(vifi, v);
462:
463: /*
464: * Discard all neighbor addresses.
465: */
466: if (!NBRM_ISEMPTY(v->uv_nbrmap))
467: vifs_with_neighbors--;
468:
469: while (v->uv_neighbors != NULL) {
470: a = v->uv_neighbors;
471: v->uv_neighbors = a->al_next;
472: nbrs[a->al_index] = NULL;
473: free((char *)a);
474: }
475: NBRM_CLRALL(v->uv_nbrmap);
476: }
477:
478:
479: /*
480: * stop routing on all vifs
481: */
482: void stop_all_vifs(void)
483: {
484: vifi_t vifi;
485: struct uvif *v;
486: struct listaddr *a;
487: struct vif_acl *acl;
488:
489: for (vifi = 0; vifi < numvifs; vifi++) {
490: v = &uvifs[vifi];
491: while (v->uv_groups != NULL) {
492: a = v->uv_groups;
493: v->uv_groups = a->al_next;
494: free((char *)a);
495: }
496: while (v->uv_neighbors != NULL) {
497: a = v->uv_neighbors;
498: v->uv_neighbors = a->al_next;
499: nbrs[a->al_index] = NULL;
500: free((char *)a);
501: }
502: while (v->uv_acl != NULL) {
503: acl = v->uv_acl;
504: v->uv_acl = acl->acl_next;
505: free((char *)acl);
506: }
507: }
508: }
509:
510:
511: /*
512: * Find the virtual interface from which an incoming packet arrived,
513: * based on the packet's source and destination IP addresses.
514: */
515: vifi_t find_vif(u_int32 src, u_int32 dst)
516: {
517: vifi_t vifi;
518: struct uvif *v;
519: struct phaddr *p;
520:
521: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
522: if (!(v->uv_flags & (VIFF_DOWN|VIFF_DISABLED))) {
523: if (v->uv_flags & VIFF_TUNNEL) {
524: if (src == v->uv_rmt_addr && (dst == v->uv_lcl_addr ||
525: dst == dvmrp_group))
526: return(vifi);
527: }
528: else {
529: if ((src & v->uv_subnetmask) == v->uv_subnet &&
530: ((v->uv_subnetmask == 0xffffffff) ||
531: (src != v->uv_subnetbcast)))
532: return(vifi);
533: for (p=v->uv_addrs; p; p=p->pa_next) {
534: if ((src & p->pa_subnetmask) == p->pa_subnet &&
535: ((p->pa_subnetmask == 0xffffffff) ||
536: (src != p->pa_subnetbcast)))
537: return(vifi);
538: }
539: }
540: }
541: }
542: return (NO_VIF);
543: }
544:
545: static void age_old_hosts(void)
546: {
547: vifi_t vifi;
548: struct uvif *v;
549: struct listaddr *g;
550:
551: /*
552: * Decrement the old-hosts-present timer for each
553: * active group on each vif.
554: */
555: for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++)
556: for (g = v->uv_groups; g != NULL; g = g->al_next)
557: if (g->al_old)
558: g->al_old--;
559: }
560:
561:
562: /*
563: * Send group membership queries on each interface for which I am querier.
564: * Note that technically, there should be a timer per interface, as the
565: * dynamics of querier election can cause the "right" time to send a
566: * query to be different on different interfaces. However, this simple
567: * implementation only ever sends queries sooner than the "right" time,
568: * so can not cause loss of membership (but can send more packets than
569: * necessary)
570: */
571: void query_groups(void)
572: {
573: vifi_t vifi;
574: struct uvif *v;
575:
576: for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
577: if (v->uv_flags & VIFF_QUERIER) {
578: send_query(v);
579: }
580: }
581: age_old_hosts();
582: }
583:
584: /*
585: * Process an incoming host membership query. Warn about
586: * IGMP version mismatches, perform querier election, and
587: * handle group-specific queries when we're not the querier.
588: */
589: void accept_membership_query(u_int32 src, u_int32 dst, u_int32 group, int tmo)
590: {
591: vifi_t vifi;
592: struct uvif *v;
593:
594: vifi = find_vif(src, dst);
595: if (vifi == NO_VIF || (uvifs[vifi].uv_flags & VIFF_TUNNEL)) {
596: logit(LOG_INFO, 0, "Ignoring group membership query from non-adjacent host %s",
597: inet_fmt(src, s1, sizeof(s1)));
598: return;
599: }
600:
601: v = &uvifs[vifi];
602: if ((tmo == 0 && !(v->uv_flags & VIFF_IGMPV1)) ||
603: (tmo != 0 && (v->uv_flags & VIFF_IGMPV1))) {
604: int i;
605:
606: /*
607: * Exponentially back-off warning rate
608: */
609: i = ++v->uv_igmpv1_warn;
610: while (i && !(i & 1))
611: i >>= 1;
612:
613: if (i == 1) {
614: logit(LOG_WARNING, 0, "Received IGMP%s report from %s on vif %d, %s",
615: tmo == 0 ? "v1" : "v2", inet_fmt(src, s1, sizeof(s1)), vifi,
616: tmo == 0 ? "please configure vif for IGMPv1" : "but I am configured for IGMPv1");
617: }
618: }
619:
620: if (v->uv_querier == NULL || v->uv_querier->al_addr != src) {
621: /*
622: * This might be:
623: * - A query from a new querier, with a lower source address
624: * than the current querier (who might be me)
625: * - A query from a new router that just started up and doesn't
626: * know who the querier is.
627: */
628: if (ntohl(src) < (v->uv_querier ? ntohl(v->uv_querier->al_addr) : ntohl(v->uv_lcl_addr))) {
629: IF_DEBUG(DEBUG_IGMP) {
630: logit(LOG_DEBUG, 0, "New querier %s (was %s) on vif %d", inet_fmt(src, s1, sizeof(s1)),
631: v->uv_querier ? inet_fmt(v->uv_querier->al_addr, s2, sizeof(s2)) : "me", vifi);
632: }
633:
634: if (!v->uv_querier) {
635: v->uv_querier = (struct listaddr *)malloc(sizeof(struct listaddr));
636: v->uv_flags &= ~VIFF_QUERIER;
637: }
638:
639: if (v->uv_querier) {
640: time(&v->uv_querier->al_ctime);
641: v->uv_querier->al_addr = src;
642: }
643: } else {
644: IF_DEBUG(DEBUG_IGMP) {
645: logit(LOG_DEBUG, 0, "Ignoring query from %s; querier on vif %d is still %s",
646: inet_fmt(src, s1, sizeof(s1)), vifi,
647: v->uv_querier ? inet_fmt(v->uv_querier->al_addr, s2, sizeof(s2)) : "me");
648: }
649: return;
650: }
651: }
652:
653: /*
654: * Reset the timer since we've received a query.
655: */
656: if (v->uv_querier && src == v->uv_querier->al_addr)
657: v->uv_querier->al_timer = 0;
658:
659: /*
660: * If this is a Group-Specific query which we did not source,
661: * we must set our membership timer to [Last Member Query Count] *
662: * the [Max Response Time] in the packet.
663: */
664: if (!(v->uv_flags & (VIFF_IGMPV1|VIFF_QUERIER))
665: && group != 0 && src != v->uv_lcl_addr) {
666: struct listaddr *g;
667:
668: IF_DEBUG(DEBUG_IGMP) {
669: logit(LOG_DEBUG, 0, "Group-specific membership query for %s from %s on vif %d, timer %d",
670: inet_fmt(group, s2, sizeof(s2)),
671: inet_fmt(src, s1, sizeof(s1)), vifi, tmo);
672: }
673:
674: for (g = v->uv_groups; g != NULL; g = g->al_next) {
675: if (group == g->al_addr && g->al_query == 0) {
676: /* setup a timeout to remove the group membership */
677: if (g->al_timerid)
678: g->al_timerid = DeleteTimer(g->al_timerid);
679:
680: /* use al_query to record our presence in last-member state */
681: g->al_timer = IGMP_LAST_MEMBER_QUERY_COUNT * tmo / IGMP_TIMER_SCALE;
682: g->al_query = -1;
683: g->al_timerid = SetTimer(vifi, g);
684:
685: IF_DEBUG(DEBUG_IGMP) {
686: logit(LOG_DEBUG, 0, "Timer for grp %s on vif %d set to %d",
687: inet_fmt(group, s2, sizeof(s2)), vifi, g->al_timer);
688: }
689: break;
690: }
691: }
692: }
693: }
694:
695: /*
696: * Process an incoming group membership report.
697: */
698: void accept_group_report(u_int32 src, u_int32 dst, u_int32 group, int r_type)
699: {
700: vifi_t vifi;
701: struct uvif *v;
702: struct listaddr *g;
703:
704: if ((vifi = find_vif(src, dst)) == NO_VIF ||
705: (uvifs[vifi].uv_flags & VIFF_TUNNEL)) {
706: logit(LOG_INFO, 0, "Ignoring group membership report from non-adjacent host %s",
707: inet_fmt(src, s1, sizeof(s1)));
708: return;
709: }
710:
711: v = &uvifs[vifi];
712:
713: /*
714: * Look for the group in our group list; if found, reset its timer.
715: */
716: for (g = v->uv_groups; g != NULL; g = g->al_next) {
717: if (group == g->al_addr) {
718: if (r_type == IGMP_V1_MEMBERSHIP_REPORT)
719: g->al_old = OLD_AGE_THRESHOLD;
720:
721: g->al_reporter = src;
722:
723: /** delete old timers, set a timer for expiration **/
724: g->al_timer = IGMP_GROUP_MEMBERSHIP_INTERVAL;
725: if (g->al_query)
726: g->al_query = DeleteTimer(g->al_query);
727: if (g->al_timerid)
728: g->al_timerid = DeleteTimer(g->al_timerid);
729: g->al_timerid = SetTimer(vifi, g);
730: break;
731: }
732: }
733:
734: /*
735: * If not found, add it to the list and update kernel cache.
736: */
737: if (g == NULL) {
738: g = (struct listaddr *)malloc(sizeof(struct listaddr));
739: if (g == NULL) {
740: logit(LOG_ERR, 0, "Malloc failed in vif.c:accept_group_report()\n"); /* FATAL! */
741: return; /* NOTREACHED */
742: }
743:
744: g->al_addr = group;
745: if (r_type == IGMP_V1_MEMBERSHIP_REPORT)
746: g->al_old = OLD_AGE_THRESHOLD;
747: else
748: g->al_old = 0;
749:
750: /** set a timer for expiration **/
751: g->al_query = 0;
752: g->al_timer = IGMP_GROUP_MEMBERSHIP_INTERVAL;
753: g->al_reporter = src;
754: g->al_timerid = SetTimer(vifi, g);
755: g->al_next = v->uv_groups;
756: v->uv_groups = g;
757: time(&g->al_ctime);
758:
759: update_lclgrp(vifi, group);
760: }
761:
762: /*
763: * Check if a graft is necessary for this group
764: */
765: chkgrp_graft(vifi, group);
766: }
767:
768: /*
769: * Process an incoming IGMPv2 Leave Group message.
770: */
771: void accept_leave_message(u_int32 src, u_int32 dst, u_int32 group)
772: {
773: vifi_t vifi;
774: struct uvif *v;
775: struct listaddr *g;
776:
777: if ((vifi = find_vif(src, dst)) == NO_VIF ||
778: (uvifs[vifi].uv_flags & VIFF_TUNNEL)) {
779: logit(LOG_INFO, 0, "Ignoring group leave report from non-adjacent host %s",
780: inet_fmt(src, s1, sizeof(s1)));
781: return;
782: }
783:
784: v = &uvifs[vifi];
785:
786: if (!(v->uv_flags & VIFF_QUERIER) || (v->uv_flags & VIFF_IGMPV1))
787: return;
788:
789: /*
790: * Look for the group in our group list in order to set up a short-timeout
791: * query.
792: */
793: for (g = v->uv_groups; g != NULL; g = g->al_next) {
794: if (group == g->al_addr) {
795: IF_DEBUG(DEBUG_IGMP) {
796: logit(LOG_DEBUG, 0, "[vif.c, _accept_leave_message] %d %d \n",
797: g->al_old, g->al_query);
798: }
799:
800: /* Ignore the leave message if there are old hosts present */
801: if (g->al_old)
802: return;
803:
804: /* still waiting for a reply to a query, ignore the leave */
805: if (g->al_query)
806: return;
807:
808: /** delete old timer set a timer for expiration **/
809: if (g->al_timerid)
810: g->al_timerid = DeleteTimer(g->al_timerid);
811:
812: #if IGMP_LAST_MEMBER_QUERY_COUNT != 2
813: This code needs to be updated to keep a counter of the number
814: of queries remaining.
815: #endif
816: /** send a group specific querry **/
817: g->al_timer = IGMP_LAST_MEMBER_QUERY_INTERVAL *
818: (IGMP_LAST_MEMBER_QUERY_COUNT + 1);
819: send_igmp(v->uv_lcl_addr, g->al_addr,
820: IGMP_MEMBERSHIP_QUERY,
821: IGMP_LAST_MEMBER_QUERY_INTERVAL * IGMP_TIMER_SCALE,
822: g->al_addr, 0);
823: g->al_query = SetQueryTimer(g, vifi,
824: IGMP_LAST_MEMBER_QUERY_INTERVAL,
825: IGMP_LAST_MEMBER_QUERY_INTERVAL * IGMP_TIMER_SCALE);
826: g->al_timerid = SetTimer(vifi, g);
827: break;
828: }
829: }
830: }
831:
832:
833: /*
834: * Send a periodic probe on all vifs.
835: * Useful to determine one-way interfaces.
836: * Detect neighbor loss faster.
837: */
838: void probe_for_neighbors(void)
839: {
840: vifi_t vifi;
841: struct uvif *v;
842:
843: for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
844: if (!(v->uv_flags & (VIFF_DOWN|VIFF_DISABLED))) {
845: send_probe_on_vif(v);
846: }
847: }
848: }
849:
850:
851: /*
852: * Send a list of all of our neighbors to the requestor, `src'.
853: */
854: void accept_neighbor_request(u_int32 src, u_int32 UNUSED dst)
855: {
856: vifi_t vifi;
857: struct uvif *v;
858: u_char *p, *ncount;
859: struct listaddr *la;
860: int datalen;
861: u_int32 temp_addr, them = src;
862:
863: #define PUT_ADDR(a) temp_addr = ntohl(a); \
864: *p++ = temp_addr >> 24; \
865: *p++ = (temp_addr >> 16) & 0xFF; \
866: *p++ = (temp_addr >> 8) & 0xFF; \
867: *p++ = temp_addr & 0xFF;
868:
869: p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
870: datalen = 0;
871:
872: for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
873: if (v->uv_flags & VIFF_DISABLED)
874: continue;
875:
876: ncount = 0;
877:
878: for (la = v->uv_neighbors; la; la = la->al_next) {
879:
880: /* Make sure that there's room for this neighbor... */
881: if (datalen + (ncount == 0 ? 4 + 3 + 4 : 4) > MAX_DVMRP_DATA_LEN) {
882: send_igmp(INADDR_ANY, them, IGMP_DVMRP, DVMRP_NEIGHBORS,
883: htonl(MROUTED_LEVEL), datalen);
884: p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
885: datalen = 0;
886: ncount = 0;
887: }
888:
889: /* Put out the header for this neighbor list... */
890: if (ncount == 0) {
891: PUT_ADDR(v->uv_lcl_addr);
892: *p++ = v->uv_metric;
893: *p++ = v->uv_threshold;
894: ncount = p;
895: *p++ = 0;
896: datalen += 4 + 3;
897: }
898:
899: PUT_ADDR(la->al_addr);
900: datalen += 4;
901: (*ncount)++;
902: }
903: }
904:
905: if (datalen != 0)
906: send_igmp(INADDR_ANY, them, IGMP_DVMRP, DVMRP_NEIGHBORS,
907: htonl(MROUTED_LEVEL), datalen);
908: }
909:
910: /*
911: * Send a list of all of our neighbors to the requestor, `src'.
912: */
913: void accept_neighbor_request2(u_int32 src, u_int32 UNUSED dst)
914: {
915: vifi_t vifi;
916: struct uvif *v;
917: u_char *p, *ncount;
918: struct listaddr *la;
919: int datalen;
920: u_int32 them = src;
921:
922: p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
923: datalen = 0;
924:
925: for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
926: register u_int16_t vflags = v->uv_flags;
927: register u_char rflags = 0;
928: if (vflags & VIFF_TUNNEL)
929: rflags |= DVMRP_NF_TUNNEL;
930: if (vflags & VIFF_SRCRT)
931: rflags |= DVMRP_NF_SRCRT;
932: if (vflags & VIFF_DOWN)
933: rflags |= DVMRP_NF_DOWN;
934: if (vflags & VIFF_DISABLED)
935: rflags |= DVMRP_NF_DISABLED;
936: if (vflags & VIFF_QUERIER)
937: rflags |= DVMRP_NF_QUERIER;
938: if (vflags & VIFF_LEAF)
939: rflags |= DVMRP_NF_LEAF;
940: ncount = 0;
941: la = v->uv_neighbors;
942: if (la == NULL) {
943: /*
944: * include down & disabled interfaces and interfaces on
945: * leaf nets.
946: */
947: if (rflags & DVMRP_NF_TUNNEL)
948: rflags |= DVMRP_NF_DOWN;
949: if (datalen > MAX_DVMRP_DATA_LEN - 12) {
950: send_igmp(INADDR_ANY, them, IGMP_DVMRP, DVMRP_NEIGHBORS2,
951: htonl(MROUTED_LEVEL), datalen);
952: p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
953: datalen = 0;
954: }
955: *(u_int*)p = v->uv_lcl_addr;
956: p += 4;
957: *p++ = v->uv_metric;
958: *p++ = v->uv_threshold;
959: *p++ = rflags;
960: *p++ = 1;
961: *(u_int*)p = v->uv_rmt_addr;
962: p += 4;
963: datalen += 12;
964: } else {
965: for ( ; la; la = la->al_next) {
966: /* Make sure that there's room for this neighbor... */
967: if (datalen + (ncount == 0 ? 4+4+4 : 4) > MAX_DVMRP_DATA_LEN) {
968: send_igmp(INADDR_ANY, them, IGMP_DVMRP, DVMRP_NEIGHBORS2,
969: htonl(MROUTED_LEVEL), datalen);
970: p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
971: datalen = 0;
972: ncount = 0;
973: }
974: /* Put out the header for this neighbor list... */
975: if (ncount == 0) {
976: /* If it's a one-way tunnel, mark it down. */
977: if (rflags & DVMRP_NF_TUNNEL && la->al_flags & NBRF_ONEWAY)
978: rflags |= DVMRP_NF_DOWN;
979: *(u_int*)p = v->uv_lcl_addr;
980: p += 4;
981: *p++ = v->uv_metric;
982: *p++ = v->uv_threshold;
983: *p++ = rflags;
984: ncount = p;
985: *p++ = 0;
986: datalen += 4 + 4;
987: }
988: /* Don't report one-way peering on phyint at all */
989: if (!(rflags & DVMRP_NF_TUNNEL) && la->al_flags & NBRF_ONEWAY)
990: continue;
991: *(u_int*)p = la->al_addr;
992: p += 4;
993: datalen += 4;
994: (*ncount)++;
995: }
996: if (*ncount == 0) {
997: *(u_int*)p = v->uv_rmt_addr;
998: p += 4;
999: datalen += 4;
1000: (*ncount)++;
1001: }
1002: }
1003: }
1004: if (datalen != 0)
1005: send_igmp(INADDR_ANY, them, IGMP_DVMRP, DVMRP_NEIGHBORS2,
1006: htonl(MROUTED_LEVEL), datalen);
1007: }
1008:
1009: void accept_info_request(u_int32 src, u_int32 UNUSED dst, u_char *p, size_t datalen)
1010: {
1011: u_char *q;
1012: int len;
1013: int outlen = 0;
1014:
1015: q = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
1016:
1017: /* To be general, this must deal properly with breaking up over-sized
1018: * packets. That implies passing a length to each function, and
1019: * allowing each function to request to be called again. Right now,
1020: * we're only implementing the one thing we are positive will fit into
1021: * a single packet, so we wimp out.
1022: */
1023: while (datalen > 0) {
1024: len = 0;
1025: switch (*p) {
1026: case DVMRP_INFO_VERSION:
1027: len = info_version(q);
1028: break;
1029:
1030: case DVMRP_INFO_NEIGHBORS:
1031: default:
1032: logit(LOG_INFO, 0, "Ignoring unknown info type %d", *p);
1033: break;
1034: }
1035: *(q+1) = len++;
1036: outlen += len * 4;
1037: q += len * 4;
1038: len = (*(p+1) + 1) * 4;
1039: p += len;
1040: datalen -= len;
1041: }
1042:
1043: if (outlen != 0)
1044: send_igmp(INADDR_ANY, src, IGMP_DVMRP, DVMRP_INFO_REPLY,
1045: htonl(MROUTED_LEVEL), outlen);
1046: }
1047:
1048: /*
1049: * Information response -- return version string
1050: */
1051: static int info_version(u_char *p)
1052: {
1053: int len;
1054:
1055: *p++ = DVMRP_INFO_VERSION;
1056: p++; /* skip over length */
1057: *p++ = 0; /* zero out */
1058: *p++ = 0; /* reserved fields */
1059: /* XXX: We use sizeof(versionstring) instead of the available
1060: * space in send_buf[] because that buffer is 8192 bytes.
1061: * It is not very likely our versionstring will ever be
1062: * as long as 100 bytes, but it's better to limit the amount
1063: * of data copied to send_buf since we do not want to risk
1064: * sending MAX size frames. */
1065: len = strlcpy((char *)p, versionstring, sizeof(versionstring));
1066:
1067: return ((len + 3) / 4);
1068: }
1069:
1070: /*
1071: * Process an incoming neighbor-list message.
1072: */
1073: void accept_neighbors(u_int32_t src, u_int32_t dst, u_char UNUSED *p, size_t UNUSED datalen, u_int32_t UNUSED level)
1074: {
1075: logit(LOG_INFO, 0, "Ignoring spurious DVMRP neighbor list from %s to %s",
1076: inet_fmt(src, s1, sizeof(s1)), inet_fmt(dst, s2, sizeof(s2)));
1077: }
1078:
1079:
1080: /*
1081: * Process an incoming neighbor-list message.
1082: */
1083: void accept_neighbors2(u_int32 src, u_int32 dst, u_char UNUSED *p, size_t UNUSED datalen, u_int32 UNUSED level)
1084: {
1085: IF_DEBUG(DEBUG_PKT) {
1086: logit(LOG_DEBUG, 0, "Ignoring spurious DVMRP neighbor list2 from %s to %s",
1087: inet_fmt(src, s1, sizeof(s1)), inet_fmt(dst, s2, sizeof(s2)));
1088: }
1089: }
1090:
1091: /*
1092: * Process an incoming info reply message.
1093: */
1094: void accept_info_reply(u_int32 src, u_int32 dst, u_char UNUSED *p, size_t UNUSED datalen)
1095: {
1096: IF_DEBUG(DEBUG_PKT) {
1097: logit(LOG_DEBUG, 0, "Ignoring spurious DVMRP info reply from %s to %s",
1098: inet_fmt(src, s1, sizeof(s1)), inet_fmt(dst, s2, sizeof(s2)));
1099: }
1100: }
1101:
1102:
1103: /*
1104: * Update the neighbor entry for neighbor 'addr' on vif 'vifi'.
1105: * 'msgtype' is the type of DVMRP message received from the neighbor.
1106: * Return the neighbor entry if 'addr' is a valid neighbor, FALSE otherwise.
1107: */
1108: struct listaddr *update_neighbor(vifi_t vifi, u_int32 addr, int msgtype, char *p, size_t datalen, u_int32 level)
1109: {
1110: struct uvif *v;
1111: struct listaddr *n;
1112: int pv = level & 0xff;
1113: int mv = (level >> 8) & 0xff;
1114: int has_genid = 0;
1115: int in_router_list = 0;
1116: int dvmrpspec = 0;
1117: u_int32 genid;
1118: u_int32 send_tables = 0;
1119: size_t i;
1120: int do_reset = FALSE;
1121:
1122: v = &uvifs[vifi];
1123:
1124: /*
1125: * Confirm that 'addr' is a valid neighbor address on vif 'vifi'.
1126: * IT IS ASSUMED that this was preceded by a call to find_vif(), which
1127: * checks that 'addr' is either a valid remote tunnel endpoint or a
1128: * non-broadcast address belonging to a directly-connected subnet.
1129: * Therefore, here we check only that 'addr' is not our own address
1130: * (due to an impostor or erroneous loopback) or an address of the form
1131: * {subnet,0} ("the unknown host"). These checks are not performed in
1132: * find_vif() because those types of address are acceptable for some
1133: * types of IGMP message (such as group membership reports).
1134: */
1135: if (!(v->uv_flags & VIFF_TUNNEL) && (addr == v->uv_lcl_addr || addr == v->uv_subnet )) {
1136: logit(LOG_WARNING, 0, "Received DVMRP message from %s: %s",
1137: (addr == v->uv_lcl_addr) ? "self (check device loopback)" : "'the unknown host'",
1138: inet_fmt(addr, s1, sizeof(s1)));
1139: return NULL;
1140: }
1141:
1142: /*
1143: * Ignore all neighbors on vifs forced into leaf mode
1144: */
1145: if (v->uv_flags & VIFF_FORCE_LEAF) {
1146: return NULL;
1147: }
1148:
1149: /*
1150: * mrouted's version 3.3 and later include the generation ID
1151: * and the list of neighbors on the vif in their probe messages.
1152: */
1153: if (msgtype == DVMRP_PROBE && ((pv == 3 && mv > 2) ||
1154: (pv > 3 && pv < 10))) {
1155: u_int32 router;
1156:
1157: IF_DEBUG(DEBUG_PEER) {
1158: logit(LOG_DEBUG, 0, "Checking probe from %s (%d.%d) on vif %d",
1159: inet_fmt(addr, s1, sizeof(s1)), pv, mv, vifi);
1160: }
1161:
1162: if (datalen < 4) {
1163: logit(LOG_WARNING, 0, "Received truncated probe message from %s (len %d)",
1164: inet_fmt(addr, s1, sizeof(s1)), datalen);
1165: return NULL;
1166: }
1167:
1168: has_genid = 1;
1169:
1170: for (i = 0; i < 4; i++)
1171: ((char *)&genid)[i] = *p++;
1172: datalen -= 4;
1173:
1174: while (datalen > 0) {
1175: if (datalen < 4) {
1176: logit(LOG_WARNING, 0, "Received truncated probe message from %s (len %d)",
1177: inet_fmt(addr, s1, sizeof(s1)), datalen);
1178: return NULL;
1179: }
1180:
1181: for (i = 0; i < 4; i++)
1182: ((char *)&router)[i] = *p++;
1183: datalen -= 4;
1184:
1185: if (router == v->uv_lcl_addr) {
1186: in_router_list = 1;
1187: break;
1188: }
1189: }
1190: }
1191:
1192: if ((pv == 3 && mv == 255) || (pv > 3 && pv < 10))
1193: dvmrpspec = 1;
1194:
1195: /*
1196: * Look for addr in list of neighbors.
1197: */
1198: for (n = v->uv_neighbors; n != NULL; n = n->al_next) {
1199: if (addr == n->al_addr) {
1200: break;
1201: }
1202: }
1203:
1204: if (n == NULL) {
1205: /*
1206: * New neighbor.
1207: *
1208: * If this neighbor follows the DVMRP spec, start the probe
1209: * handshake. If not, then it doesn't require the probe
1210: * handshake, so establish the peering immediately.
1211: */
1212: if (dvmrpspec && (msgtype != DVMRP_PROBE))
1213: return NULL;
1214:
1215: for (i = 0; i < MAXNBRS; i++)
1216: if (nbrs[i] == NULL)
1217: break;
1218:
1219: if (i == MAXNBRS) {
1220: /* XXX This is a severe new restriction. */
1221: /* XXX want extensible bitmaps! */
1222: logit(LOG_ERR, 0, "Cannot handle %dth neighbor %s on vif %d!",
1223: MAXNBRS, inet_fmt(addr, s1, sizeof(s1)), vifi);
1224: return NULL; /* NOTREACHED */
1225: }
1226:
1227: /*
1228: * Add it to our list of neighbors.
1229: */
1230: IF_DEBUG(DEBUG_PEER) {
1231: logit(LOG_DEBUG, 0, "New neighbor %s on vif %d v%d.%d nf 0x%02x idx %d",
1232: inet_fmt(addr, s1, sizeof(s1)), vifi, level & 0xff, (level >> 8) & 0xff,
1233: (level >> 16) & 0xff, i);
1234: }
1235:
1236: n = (struct listaddr *)malloc(sizeof(struct listaddr));
1237: if (n == NULL) {
1238: logit(LOG_ERR, 0, "Malloc failed in vif.c:update_neighbor()\n"); /* FATAL! */
1239: return NULL; /* NOTREACHED */
1240: }
1241:
1242: n->al_addr = addr;
1243: n->al_pv = pv;
1244: n->al_mv = mv;
1245: n->al_genid = has_genid ? genid : 0;
1246: n->al_index = i;
1247: nbrs[i] = n;
1248:
1249: time(&n->al_ctime);
1250: n->al_timer = 0;
1251: n->al_flags = has_genid ? NBRF_GENID : 0;
1252: n->al_next = v->uv_neighbors;
1253: v->uv_neighbors = n;
1254:
1255: /*
1256: * If we are not configured to peer with non-pruning routers,
1257: * check the deprecated "I-know-how-to-prune" bit. This bit
1258: * was MBZ in early mrouted implementations (<3.5) and is required
1259: * to be set by the DVMRPv3 specification.
1260: */
1261: if (!(v->uv_flags & VIFF_ALLOW_NONPRUNERS) &&
1262: !((level & 0x020000) || (pv == 3 && mv < 5))) {
1263: n->al_flags |= NBRF_TOOOLD;
1264: }
1265:
1266: /*
1267: * If this router implements the DVMRPv3 spec, then don't peer
1268: * with him if we haven't yet established a bidirectional connection.
1269: */
1270: if (dvmrpspec) {
1271: if (!in_router_list) {
1272: IF_DEBUG(DEBUG_PEER) {
1273: logit(LOG_DEBUG, 0, "Waiting for probe from %s with my addr",
1274: inet_fmt(addr, s1, sizeof(s1)));
1275: }
1276: n->al_flags |= NBRF_WAITING;
1277: return NULL;
1278: }
1279: }
1280:
1281: if (n->al_flags & NBRF_DONTPEER) {
1282: IF_DEBUG(DEBUG_PEER) {
1283: logit(LOG_DEBUG, 0, "Not peering with %s on vif %d because %x",
1284: inet_fmt(addr, s1, sizeof(s1)), vifi, n->al_flags & NBRF_DONTPEER);
1285: }
1286: return NULL;
1287: }
1288:
1289: /*
1290: * If we thought that we had no neighbors on this vif, send a route
1291: * report to the vif. If this is just a new neighbor on the same
1292: * vif, send the route report just to the new neighbor.
1293: */
1294: if (NBRM_ISEMPTY(v->uv_nbrmap)) {
1295: send_tables = v->uv_dst_addr;
1296: vifs_with_neighbors++;
1297: } else {
1298: send_tables = addr;
1299: }
1300:
1301:
1302: NBRM_SET(i, v->uv_nbrmap);
1303: add_neighbor_to_routes(vifi, i);
1304: } else {
1305: /*
1306: * Found it. Reset its timer.
1307: */
1308: n->al_timer = 0;
1309:
1310: if (n->al_flags & NBRF_WAITING && msgtype == DVMRP_PROBE) {
1311: n->al_flags &= ~NBRF_WAITING;
1312: if (!in_router_list) {
1313: logit(LOG_WARNING, 0, "Possible one-way peering with %s on vif %d",
1314: inet_fmt(addr, s1, sizeof(s1)), vifi);
1315: n->al_flags |= NBRF_ONEWAY;
1316: return NULL;
1317: } else {
1318: if (NBRM_ISEMPTY(v->uv_nbrmap)) {
1319: send_tables = v->uv_dst_addr;
1320: vifs_with_neighbors++;
1321: } else {
1322: send_tables = addr;
1323: }
1324: NBRM_SET(n->al_index, v->uv_nbrmap);
1325: add_neighbor_to_routes(vifi, n->al_index);
1326: IF_DEBUG(DEBUG_PEER) {
1327: logit(LOG_DEBUG, 0, "%s on vif %d exits WAITING",
1328: inet_fmt(addr, s1, sizeof(s1)), vifi);
1329: }
1330: }
1331: }
1332:
1333: if (n->al_flags & NBRF_ONEWAY && msgtype == DVMRP_PROBE) {
1334: if (in_router_list) {
1335: if (NBRM_ISEMPTY(v->uv_nbrmap))
1336: vifs_with_neighbors++;
1337: NBRM_SET(n->al_index, v->uv_nbrmap);
1338: add_neighbor_to_routes(vifi, n->al_index);
1339: logit(LOG_NOTICE, 0, "Peering with %s on vif %d is no longer one-way",
1340: inet_fmt(addr, s1, sizeof(s1)), vifi);
1341: n->al_flags &= ~NBRF_ONEWAY;
1342: } else {
1343: /* XXX rate-limited warning message? */
1344: IF_DEBUG(DEBUG_PEER) {
1345: logit(LOG_DEBUG, 0, "%s on vif %d is still ONEWAY",
1346: inet_fmt(addr, s1, sizeof(s1)), vifi);
1347: }
1348: }
1349: }
1350:
1351: /*
1352: * When peering with a genid-capable but pre-DVMRP spec peer,
1353: * we might bring up the peering with a route report and not
1354: * remember his genid. Assume that he doesn't send a route
1355: * report and then reboot before sending a probe.
1356: */
1357: if (has_genid && !(n->al_flags & NBRF_GENID)) {
1358: n->al_flags |= NBRF_GENID;
1359: n->al_genid = genid;
1360: }
1361:
1362: /*
1363: * update the neighbors version and protocol number and genid
1364: * if changed => router went down and came up,
1365: * so take action immediately.
1366: */
1367: if ((n->al_pv != pv) ||
1368: (n->al_mv != mv) ||
1369: (has_genid && n->al_genid != genid)) {
1370:
1371: do_reset = TRUE;
1372: IF_DEBUG(DEBUG_PEER) {
1373: logit(LOG_DEBUG, 0, "Version/genid change neighbor %s [old:%d.%d/%8x, new:%d.%d/%8x]",
1374: inet_fmt(addr, s1, sizeof(s1)),
1375: n->al_pv, n->al_mv, n->al_genid, pv, mv, genid);
1376: }
1377:
1378: n->al_pv = pv;
1379: n->al_mv = mv;
1380: n->al_genid = genid;
1381: time(&n->al_ctime);
1382: }
1383:
1384: if ((pv == 3 && mv > 2) || (pv > 3 && pv < 10)) {
1385: if (!(n->al_flags & VIFF_ONEWAY) && has_genid && !in_router_list &&
1386: (time(NULL) - n->al_ctime > 20)) {
1387: if (NBRM_ISSET(n->al_index, v->uv_nbrmap)) {
1388: NBRM_CLR(n->al_index, v->uv_nbrmap);
1389: if (NBRM_ISEMPTY(v->uv_nbrmap))
1390: vifs_with_neighbors--;
1391: }
1392: delete_neighbor_from_routes(addr, vifi, n->al_index);
1393: reset_neighbor_state(vifi, addr);
1394: logit(LOG_WARNING, 0, "Peering with %s on vif %d is one-way",
1395: inet_fmt(addr, s1, sizeof(s1)), vifi);
1396: n->al_flags |= NBRF_ONEWAY;
1397: }
1398: }
1399:
1400: if (n->al_flags & NBRF_DONTPEER) {
1401: IF_DEBUG(DEBUG_PEER) {
1402: logit(LOG_DEBUG, 0, "Not peering with %s on vif %d because %x",
1403: inet_fmt(addr, s1, sizeof(s1)), vifi, n->al_flags & NBRF_DONTPEER);
1404: }
1405: return NULL;
1406: }
1407:
1408: /* check "leaf" flag */
1409: }
1410: if (do_reset) {
1411: reset_neighbor_state(vifi, addr);
1412: if (!send_tables)
1413: send_tables = addr;
1414: }
1415: if (send_tables) {
1416: send_probe_on_vif(v);
1417: report(ALL_ROUTES, vifi, send_tables);
1418: }
1419: v->uv_leaf_timer = 0;
1420: v->uv_flags &= ~VIFF_LEAF;
1421:
1422: return n;
1423: }
1424:
1425:
1426: /*
1427: * On every timer interrupt, advance the timer in each neighbor and
1428: * group entry on every vif.
1429: */
1430: void age_vifs(void)
1431: {
1432: vifi_t vifi;
1433: struct uvif *v;
1434: struct listaddr *a, *prev_a;
1435: u_int32 addr;
1436:
1437: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v ) {
1438: if (v->uv_leaf_timer && (v->uv_leaf_timer -= TIMER_INTERVAL == 0)) {
1439: v->uv_flags |= VIFF_LEAF;
1440: }
1441:
1442: for (prev_a = (struct listaddr *)&(v->uv_neighbors),
1443: a = v->uv_neighbors;
1444: a != NULL;
1445: prev_a = a, a = a->al_next) {
1446: u_long exp_time;
1447: int idx;
1448:
1449: if (((a->al_pv == 3) && (a->al_mv >= 3)) ||
1450: ((a->al_pv > 3) && (a->al_pv < 10)))
1451: exp_time = NEIGHBOR_EXPIRE_TIME;
1452: else
1453: exp_time = OLD_NEIGHBOR_EXPIRE_TIME;
1454:
1455: if ((a->al_timer += TIMER_INTERVAL) < exp_time)
1456: continue;
1457:
1458: IF_DEBUG(DEBUG_PEER) {
1459: logit(LOG_DEBUG, 0, "Neighbor %s (%d.%d) expired after %d seconds",
1460: inet_fmt(a->al_addr, s1, sizeof(s1)), a->al_pv, a->al_mv, exp_time);
1461: }
1462:
1463: /*
1464: * Neighbor has expired; delete it from the neighbor list,
1465: * delete it from the 'dominants' and 'subordinates arrays of
1466: * any route entries.
1467: */
1468: NBRM_CLR(a->al_index, v->uv_nbrmap);
1469: nbrs[a->al_index] = NULL; /* XXX is it a good idea to reuse indxs? */
1470: idx = a->al_index;
1471: addr = a->al_addr;
1472: prev_a->al_next = a->al_next;
1473: free((char *)a);
1474: a = prev_a;/*XXX use ** */
1475:
1476: delete_neighbor_from_routes(addr, vifi, idx);
1477: reset_neighbor_state(vifi, addr);
1478:
1479: if (NBRM_ISEMPTY(v->uv_nbrmap))
1480: vifs_with_neighbors--;
1481:
1482: v->uv_leaf_timer = LEAF_CONFIRMATION_TIME;
1483: }
1484:
1485: if (v->uv_querier &&
1486: (v->uv_querier->al_timer += TIMER_INTERVAL) >
1487: IGMP_OTHER_QUERIER_PRESENT_INTERVAL) {
1488: /*
1489: * The current querier has timed out. We must become the
1490: * querier.
1491: */
1492: IF_DEBUG(DEBUG_IGMP) {
1493: logit(LOG_DEBUG, 0, "Querier %s timed out",
1494: inet_fmt(v->uv_querier->al_addr, s1, sizeof(s1)));
1495: }
1496: free(v->uv_querier);
1497: v->uv_querier = NULL;
1498: v->uv_flags |= VIFF_QUERIER;
1499: send_query(v);
1500: }
1501: }
1502: }
1503:
1504: /*
1505: * Returns the neighbor info struct for a given neighbor
1506: */
1507: struct listaddr *neighbor_info(vifi_t vifi, u_int32 addr)
1508: {
1509: struct listaddr *u;
1510:
1511: for (u = uvifs[vifi].uv_neighbors; u; u = u->al_next)
1512: if (u->al_addr == addr)
1513: return u;
1514:
1515: return NULL;
1516: }
1517:
1518: static struct vnflags {
1519: int vn_flag;
1520: char *vn_name;
1521: } vifflags[] = {
1522: { VIFF_DOWN, "down" },
1523: { VIFF_DISABLED, "disabled" },
1524: { VIFF_QUERIER, "querier" },
1525: { VIFF_ONEWAY, "one-way" },
1526: { VIFF_LEAF, "leaf" },
1527: { VIFF_IGMPV1, "IGMPv1" },
1528: { VIFF_REXMIT_PRUNES, "rexmit_prunes" },
1529: { VIFF_PASSIVE, "passive" },
1530: { VIFF_ALLOW_NONPRUNERS,"allow_nonpruners" },
1531: { VIFF_NOFLOOD, "noflood" },
1532: { VIFF_NOTRANSIT, "notransit" },
1533: { VIFF_BLASTER, "blaster" },
1534: { VIFF_FORCE_LEAF, "force_leaf" },
1535: { VIFF_OTUNNEL, "old-tunnel" },
1536: };
1537:
1538: static struct vnflags nbrflags[] = {
1539: { NBRF_LEAF, "leaf" },
1540: { NBRF_GENID, "have-genid" },
1541: { NBRF_WAITING, "waiting" },
1542: { NBRF_ONEWAY, "one-way" },
1543: { NBRF_TOOOLD, "too old" },
1544: { NBRF_TOOMANYROUTES, "too many routes" },
1545: { NBRF_NOTPRUNING, "not pruning?" },
1546: };
1547:
1548: /*
1549: * Print the contents of the uvifs array on file 'fp'.
1550: */
1551: void dump_vifs(FILE *fp)
1552: {
1553: vifi_t vifi;
1554: struct uvif *v;
1555: struct listaddr *a;
1556: struct phaddr *p;
1557: struct vif_acl *acl;
1558: size_t i;
1559: struct sioc_vif_req v_req;
1560: time_t now;
1561: char *label;
1562:
1563: time(&now);
1564: fprintf(fp, "vifs_with_neighbors = %d\n", vifs_with_neighbors);
1565:
1566: if (vifs_with_neighbors == 1)
1567: fprintf(fp,"[This host is a leaf]\n\n");
1568:
1569: fprintf(fp,
1570: "\nVirtual Interface Table\n%s",
1571: "Vif Name Local-Address ");
1572: fprintf(fp,
1573: "M Thr Rate Flags\n");
1574:
1575: for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) {
1576:
1577: fprintf(fp, "%2u %6s %-15s %6s: %-18s %2u %3u %5u ",
1578: vifi,
1579: v->uv_name,
1580: inet_fmt(v->uv_lcl_addr, s1, sizeof(s1)),
1581: (v->uv_flags & VIFF_TUNNEL) ?
1582: "tunnel":
1583: "subnet",
1584: (v->uv_flags & VIFF_TUNNEL) ?
1585: inet_fmt(v->uv_rmt_addr, s2, sizeof(s2)) :
1586: inet_fmts(v->uv_subnet, v->uv_subnetmask, s3, sizeof(s3)),
1587: v->uv_metric,
1588: v->uv_threshold,
1589: v->uv_rate_limit);
1590:
1591: for (i = 0; i < sizeof(vifflags) / sizeof(struct vnflags); i++)
1592: if (v->uv_flags & vifflags[i].vn_flag)
1593: fprintf(fp, " %s", vifflags[i].vn_name);
1594:
1595: fprintf(fp, "\n");
1596: /*
1597: fprintf(fp, " #routes: %d\n", v->uv_nroutes);
1598: */
1599: if (v->uv_admetric != 0)
1600: fprintf(fp, " advert-metric %2u\n",
1601: v->uv_admetric);
1602:
1603: label = "alternate subnets:";
1604: for (p = v->uv_addrs; p; p = p->pa_next) {
1605: fprintf(fp, " %18s %s\n", label,
1606: inet_fmts(p->pa_subnet, p->pa_subnetmask, s1, sizeof(s1)));
1607: label = "";
1608: }
1609:
1610: label = "peers:";
1611: for (a = v->uv_neighbors; a != NULL; a = a->al_next) {
1612: fprintf(fp, " %6s %s (%d.%d) [%d]",
1613: label, inet_fmt(a->al_addr, s1, sizeof(s1)), a->al_pv, a->al_mv,
1614: a->al_index);
1615: for (i = 0; i < sizeof(nbrflags) / sizeof(struct vnflags); i++)
1616: if (a->al_flags & nbrflags[i].vn_flag)
1617: fprintf(fp, " %s", nbrflags[i].vn_name);
1618: fprintf(fp, " up %s\n", scaletime(now - a->al_ctime));
1619: /*fprintf(fp, " #routes %d\n", a->al_nroutes);*/
1620: label = "";
1621: }
1622:
1623: label = "group host (time left):";
1624: for (a = v->uv_groups; a != NULL; a = a->al_next) {
1625: fprintf(fp, " %23s %-15s %-15s (%s)\n",
1626: label,
1627: inet_fmt(a->al_addr, s1, sizeof(s1)),
1628: inet_fmt(a->al_reporter, s2, sizeof(s2)),
1629: scaletime(timer_leftTimer(a->al_timerid)));
1630: label = "";
1631: }
1632: label = "boundaries:";
1633: for (acl = v->uv_acl; acl != NULL; acl = acl->acl_next) {
1634: fprintf(fp, " %11s %-18s\n", label,
1635: inet_fmts(acl->acl_addr, acl->acl_mask, s1, sizeof(s1)));
1636: label = "";
1637: }
1638: if (v->uv_filter) {
1639: struct vf_element *vfe;
1640: char lbuf[100];
1641:
1642: snprintf(lbuf, sizeof(lbuf), "%5s %7s filter:",
1643: v->uv_filter->vf_flags & VFF_BIDIR ? "bidir" : " ",
1644: v->uv_filter->vf_type == VFT_ACCEPT ? "accept" : "deny");
1645: label = lbuf;
1646: for (vfe = v->uv_filter->vf_filter;
1647: vfe != NULL; vfe = vfe->vfe_next) {
1648: fprintf(fp, " %23s %-18s%s\n",
1649: label,
1650: inet_fmts(vfe->vfe_addr, vfe->vfe_mask, s1, sizeof(s1)),
1651: vfe->vfe_flags & VFEF_EXACT ? " (exact)" : "");
1652: label = "";
1653: }
1654: }
1655: if (!(v->uv_flags & (VIFF_TUNNEL|VIFF_DOWN|VIFF_DISABLED))) {
1656: fprintf(fp, " IGMP querier: ");
1657: if (v->uv_querier == NULL)
1658: if (v->uv_flags & VIFF_QUERIER)
1659: fprintf(fp, "%-18s (this system)\n",
1660: inet_fmt(v->uv_lcl_addr, s1, sizeof(s1)));
1661: else
1662: fprintf(fp, "NONE - querier election failure?\n");
1663: else
1664: fprintf(fp, "%-18s up %s last heard %s ago\n",
1665: inet_fmt(v->uv_querier->al_addr, s1, sizeof(s1)),
1666: scaletime(now - v->uv_querier->al_ctime),
1667: scaletime(v->uv_querier->al_timer));
1668: }
1669: if (v->uv_flags & VIFF_BLASTER)
1670: fprintf(fp, " blasterbuf size: %dk\n",
1671: v->uv_blasterlen / 1024);
1672: fprintf(fp, " Nbr bitmaps: 0x%08lx%08lx\n",/*XXX*/
1673: v->uv_nbrmap.hi, v->uv_nbrmap.lo);
1674: if (v->uv_prune_lifetime != 0)
1675: fprintf(fp, " Prune Lifetime: %d seconds\n",
1676: v->uv_prune_lifetime);
1677:
1678: v_req.vifi = vifi;
1679: if (did_final_init) {
1680: if (ioctl(udp_socket, SIOCGETVIFCNT, (char *)&v_req) < 0) {
1681: logit(LOG_WARNING, errno, "Failed ioctl SIOCGETVIFCNT on vif %d", vifi);
1682: } else {
1683: fprintf(fp, " pkts/bytes in : %lu/%lu\n",
1684: v_req.icount, v_req.ibytes);
1685: fprintf(fp, " pkts/bytes out: %lu/%lu\n",
1686: v_req.ocount, v_req.obytes);
1687: }
1688: }
1689: fprintf(fp, "\n");
1690: }
1691: fprintf(fp, "\n");
1692: }
1693:
1694: /*
1695: * Time out record of a group membership on a vif
1696: */
1697: static void DelVif(void *arg)
1698: {
1699: cbk_t *cbk = (cbk_t *)arg;
1700: vifi_t vifi = cbk->vifi;
1701: struct uvif *v = &uvifs[vifi];
1702: struct listaddr *a, **anp, *g = cbk->g;
1703:
1704: /*
1705: * Group has expired
1706: * delete all kernel cache entries with this group
1707: */
1708: if (g->al_query)
1709: DeleteTimer(g->al_query);
1710:
1711: delete_lclgrp(vifi, g->al_addr);
1712:
1713: anp = &(v->uv_groups);
1714: while ((a = *anp) != NULL) {
1715: if (a == g) {
1716: *anp = a->al_next;
1717: free((char *)a);
1718: } else {
1719: anp = &a->al_next;
1720: }
1721: }
1722:
1723: free(cbk);
1724: }
1725:
1726: /*
1727: * Set a timer to delete the record of a group membership on a vif.
1728: */
1729: static int SetTimer(vifi_t vifi, struct listaddr *g)
1730: {
1731: cbk_t *cbk;
1732:
1733: cbk = (cbk_t *)malloc(sizeof(cbk_t));
1734: if (!cbk) {
1735: logit(LOG_ERR, 0, "Malloc failed in vif.c:SetTimer()\n");
1736: return -1; /* NOTREACHED */
1737: }
1738:
1739: cbk->g = g;
1740: cbk->vifi = vifi;
1741:
1742: return timer_setTimer(g->al_timer, DelVif, cbk);
1743: }
1744:
1745: /*
1746: * Delete a timer that was set above.
1747: */
1748: static int DeleteTimer(int id)
1749: {
1750: timer_clearTimer(id);
1751:
1752: return 0;
1753: }
1754:
1755: /*
1756: * Send a group-specific query.
1757: */
1758: static void SendQuery(void *arg)
1759: {
1760: cbk_t *cbk = (cbk_t *)arg;
1761: struct uvif *v = &uvifs[cbk->vifi];
1762:
1763: send_igmp(v->uv_lcl_addr, cbk->g->al_addr, IGMP_MEMBERSHIP_QUERY,
1764: cbk->q_time, cbk->g->al_addr, 0);
1765: cbk->g->al_query = 0;
1766: free(cbk);
1767: }
1768:
1769: /*
1770: * Set a timer to send a group-specific query.
1771: */
1772: static int SetQueryTimer(struct listaddr *g, vifi_t vifi, int to_expire, int q_time)
1773: {
1774: cbk_t *cbk;
1775:
1776: cbk = (cbk_t *)malloc(sizeof(cbk_t));
1777: if (!cbk) {
1778: logit(LOG_WARNING, 0, "Malloc failed in vif.c:setQueryTimer()\n");
1779: return -1;
1780: }
1781:
1782: cbk->g = g;
1783: cbk->q_time = q_time;
1784: cbk->vifi = vifi;
1785:
1786: return timer_setTimer(to_expire, SendQuery, cbk);
1787: }
1788:
1789: /**
1790: * Local Variables:
1791: * version-control: t
1792: * indent-tabs-mode: t
1793: * c-file-style: "ellemtel"
1794: * c-basic-offset: 4
1795: * End:
1796: */
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