1: /*
2: * Copyright (c) 1998-2001
3: * University of Southern California/Information Sciences Institute.
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: * 3. Neither the name of the project nor the names of its contributors
15: * may be used to endorse or promote products derived from this software
16: * without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28: * SUCH DAMAGE.
29: */
30: /*
31: * Part of this program has been derived from mrouted.
32: * The mrouted program is covered by the license in the accompanying file
33: * named "LICENSE.mrouted".
34: *
35: * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
36: * Leland Stanford Junior University.
37: *
38: */
39:
40:
41: #include "defs.h"
42:
43: /*
44: * Helper macros
45: */
46: #define is_uv_subnet(src, v) \
47: (src & v->uv_subnetmask) == v->uv_subnet && ((v->uv_subnetmask == 0xffffffff) || (src != v->uv_subnetbcast))
48:
49: #define is_pa_subnet(src, v) \
50: (src & p->pa_subnetmask) == p->pa_subnet && ((p->pa_subnetmask == 0xffffffff) || (src != p->pa_subnetbcast))
51:
52: /*
53: * Exported variables.
54: */
55: struct uvif uvifs[MAXVIFS]; /* array of all virtual interfaces */
56: vifi_t numvifs; /* Number of vifs in use */
57: int vifs_down; /* 1=>some interfaces are down */
58: int phys_vif; /* An enabled vif */
59: vifi_t reg_vif_num; /* really virtual interface for registers */
60: int udp_socket; /* Since the honkin' kernel doesn't support
61: * ioctls on raw IP sockets, we need a UDP
62: * socket as well as our IGMP (raw) socket. */
63: int total_interfaces; /* Number of all interfaces: including the
64: * non-configured, but excluding the
65: * loopback interface and the non-multicast
66: * capable interfaces.
67: */
68:
69: uint32_t default_route_metric = UCAST_DEFAULT_ROUTE_METRIC;
70: uint32_t default_route_distance = UCAST_DEFAULT_ROUTE_DISTANCE;
71:
72: /*
73: * Forward declarations
74: */
75: static void start_vif (vifi_t vifi);
76: static void stop_vif (vifi_t vifi);
77: static void start_all_vifs (void);
78: static int init_reg_vif (void);
79: static int update_reg_vif (vifi_t register_vifi);
80:
81:
82: void init_vifs(void)
83: {
84: vifi_t vifi;
85: struct uvif *v;
86: int enabled_vifs;
87:
88: numvifs = 0;
89: reg_vif_num = NO_VIF;
90: vifs_down = FALSE;
91:
92: /* Configure the vifs based on the interface configuration of the the kernel and
93: * the contents of the configuration file. (Open a UDP socket for ioctl use in
94: * the config procedures if the kernel can't handle IOCTL's on the IGMP socket.) */
95: #ifdef IOCTL_OK_ON_RAW_SOCKET
96: udp_socket = igmp_socket;
97: #else
98: if ((udp_socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
99: logit(LOG_ERR, errno, "UDP socket");
100: #endif
101:
102: /* Clean up all vifs */
103: for (vifi = 0, v = uvifs; vifi < MAXVIFS; ++vifi, ++v)
104: zero_vif(v, FALSE);
105:
106: logit(LOG_INFO, 0, "Getting vifs from kernel");
107: config_vifs_from_kernel();
108: if (disable_all_by_default) {
109: logit(LOG_INFO, 0, "Disabling all vifs from kernel");
110:
111: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v)
112: v->uv_flags |= VIFF_DISABLED;
113: }
114:
115: logit(LOG_INFO, 0, "Getting vifs from %s", config_file);
116: config_vifs_from_file();
117:
118: /*
119: * Quit if there are fewer than two enabled vifs.
120: */
121: enabled_vifs = 0;
122: phys_vif = -1;
123:
124: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
125: /* Initialize the outgoing timeout for each vif. Currently use a fixed time
126: * 'PIM_JOIN_PRUNE_HOLDTIME'. Later, may add a configurable array to feed
127: * these parameters, or compute them as function of the i/f bandwidth and the
128: * overall connectivity...etc. */
129: SET_TIMER(v->uv_jp_timer, PIM_JOIN_PRUNE_HOLDTIME);
130: if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_REGISTER | VIFF_TUNNEL))
131: continue;
132:
133: if (phys_vif == -1)
134: phys_vif = vifi;
135:
136: enabled_vifs++;
137: }
138:
139: if (enabled_vifs < 1) /* XXX: TODO: */
140: logit(LOG_ERR, 0, "Cannot forward: %s", enabled_vifs == 0 ? "no enabled vifs" : "only one enabled vif");
141:
142: k_init_pim(igmp_socket); /* Call to kernel to initialize structures */
143:
144: /* Add a dummy virtual interface to support Registers in the kernel.
145: * In order for this to work, the kernel has to have been modified
146: * with the PIM patches to ip_mroute.{c,h} and ip.c
147: */
148: init_reg_vif();
149:
150: start_all_vifs();
151: }
152:
153: /*
154: * Initialize the passed vif with all appropriate default values.
155: * "t" is true if a tunnel or register_vif, or false if a phyint.
156: */
157: void zero_vif(struct uvif *v, int t)
158: {
159: v->uv_flags = 0; /* Default to IGMPv3 */
160: v->uv_metric = DEFAULT_METRIC;
161: v->uv_admetric = 0;
162: v->uv_threshold = DEFAULT_THRESHOLD;
163: v->uv_rate_limit = t ? DEFAULT_REG_RATE_LIMIT : DEFAULT_PHY_RATE_LIMIT;
164: v->uv_lcl_addr = INADDR_ANY_N;
165: v->uv_rmt_addr = INADDR_ANY_N;
166: v->uv_dst_addr = t ? INADDR_ANY_N : allpimrouters_group;
167: v->uv_subnet = INADDR_ANY_N;
168: v->uv_subnetmask = INADDR_ANY_N;
169: v->uv_subnetbcast = INADDR_ANY_N;
170: strlcpy(v->uv_name, "", IFNAMSIZ);
171: v->uv_groups = (struct listaddr *)NULL;
172: v->uv_dvmrp_neighbors = (struct listaddr *)NULL;
173: NBRM_CLRALL(v->uv_nbrmap);
174: v->uv_querier = (struct listaddr *)NULL;
175: v->uv_igmpv1_warn = 0;
176: v->uv_prune_lifetime = 0;
177: v->uv_acl = (struct vif_acl *)NULL;
178: RESET_TIMER(v->uv_leaf_timer);
179: v->uv_addrs = (struct phaddr *)NULL;
180: v->uv_filter = (struct vif_filter *)NULL;
181:
182: RESET_TIMER(v->uv_hello_timer);
183: v->uv_dr_prio = PIM_HELLO_DR_PRIO_DEFAULT;
184: v->uv_genid = 0;
185:
186: RESET_TIMER(v->uv_gq_timer);
187: RESET_TIMER(v->uv_jp_timer);
188: v->uv_pim_neighbors = (struct pim_nbr_entry *)NULL;
189: v->uv_local_pref = default_route_distance;
190: v->uv_local_metric = default_route_metric;
191: #ifdef __linux__
192: v->uv_ifindex = -1;
193: #endif /* __linux__ */
194: }
195:
196:
197: /*
198: * Add a (the) register vif to the vif table.
199: */
200: static int init_reg_vif(void)
201: {
202: struct uvif *v;
203: vifi_t i;
204:
205: v = &uvifs[numvifs];
206: v->uv_flags = 0;
207:
208: if ((numvifs + 1) == MAXVIFS) {
209: /* Exit the program! The PIM router must have a Register vif */
210: logit(LOG_ERR, 0, "Cannot install the Register vif: too many interfaces");
211:
212: return FALSE;
213: }
214:
215: /*
216: * So far in PIM we need only one register vif and we save its number in
217: * the global reg_vif_num.
218: */
219: reg_vif_num = numvifs;
220:
221: /* set the REGISTER flag */
222: v->uv_flags = VIFF_REGISTER;
223: #ifdef PIM_EXPERIMENTAL
224: v->uv_flags |= VIFF_REGISTER_KERNEL_ENCAP;
225: #endif
226: strlcpy(v->uv_name, "register_vif0", sizeof(v->uv_name));
227:
228: /* Use the address of the first available physical interface to
229: * create the register vif.
230: */
231: for (i = 0; i < numvifs; i++) {
232: if (uvifs[i].uv_flags & (VIFF_DOWN | VIFF_DISABLED | VIFF_REGISTER | VIFF_TUNNEL))
233: continue;
234:
235: break;
236: }
237:
238: if (i >= numvifs) {
239: logit(LOG_ERR, 0, "No physical interface enabled");
240: return -1;
241: }
242:
243: v->uv_lcl_addr = uvifs[i].uv_lcl_addr;
244: v->uv_threshold = MINTTL;
245:
246: numvifs++;
247: total_interfaces++;
248:
249: return 0;
250: }
251:
252:
253: static void start_all_vifs(void)
254: {
255: vifi_t vifi;
256: struct uvif *v;
257: u_int action;
258:
259: /* Start first the NON-REGISTER vifs */
260: for (action = 0; ; action = VIFF_REGISTER) {
261: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
262: /* If starting non-registers but the vif is a register or if starting
263: * registers, but the interface is not a register, then just continue. */
264: if ((v->uv_flags & VIFF_REGISTER) ^ action)
265: continue;
266:
267: /* Start vif if not DISABLED or DOWN */
268: if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN)) {
269: if (v->uv_flags & VIFF_DISABLED)
270: logit(LOG_INFO, 0, "Interface %s is DISABLED; vif #%u out of service", v->uv_name, vifi);
271: else
272: logit(LOG_INFO, 0, "Interface %s is DOWN; vif #%u out of service", v->uv_name, vifi);
273: } else {
274: start_vif(vifi);
275: }
276: }
277:
278: if (action == VIFF_REGISTER)
279: break; /* We are done */
280: }
281: }
282:
283:
284: /*
285: * stop all vifs
286: */
287: void stop_all_vifs(void)
288: {
289: vifi_t vifi;
290: struct uvif *v;
291:
292: for (vifi = 0; vifi < numvifs; vifi++) {
293: v = &uvifs[vifi];
294: if (!(v->uv_flags & VIFF_DOWN))
295: stop_vif(vifi);
296: }
297: }
298:
299:
300: /*
301: * Initialize the vif and add to the kernel. The vif can be either
302: * physical, register or tunnel (tunnels will be used in the future
303: * when this code becomes PIM multicast boarder router.
304: */
305: static void start_vif(vifi_t vifi)
306: {
307: struct uvif *v;
308:
309: v = &uvifs[vifi];
310: /* Initialy no router on any vif */
311: if (v->uv_flags & VIFF_REGISTER)
312: v->uv_flags = v->uv_flags & ~VIFF_DOWN;
313: else {
314: v->uv_flags = (v->uv_flags | VIFF_DR | VIFF_NONBRS) & ~VIFF_DOWN;
315:
316: /* https://tools.ietf.org/html/draft-ietf-pim-hello-genid-01 */
317: v->uv_genid = RANDOM();
318:
319: SET_TIMER(v->uv_hello_timer, 1 + RANDOM() % pim_timer_hello_interval);
320: SET_TIMER(v->uv_jp_timer, 1 + RANDOM() % PIM_JOIN_PRUNE_PERIOD);
321: /* TODO: CHECK THE TIMERS!!!!! Set or reset? */
322: RESET_TIMER(v->uv_gq_timer);
323: v->uv_pim_neighbors = (pim_nbr_entry_t *)NULL;
324: }
325:
326: /* Tell kernel to add, i.e. start this vif */
327: k_add_vif(igmp_socket, vifi, &uvifs[vifi]);
328: logit(LOG_INFO, 0, "Interface %s comes up; vif #%u now in service", v->uv_name, vifi);
329:
330: if (!(v->uv_flags & VIFF_REGISTER)) {
331: /* Join the PIM multicast group on the interface. */
332: k_join(pim_socket, allpimrouters_group, v);
333:
334: /* Join the ALL-ROUTERS multicast group on the interface. This
335: * allows mtrace requests to loop back if they are run on the
336: * multicast router. */
337: k_join(igmp_socket, allrouters_group, v);
338:
339: /* Join INADDR_ALLRPTS_GROUP to support IGMPv3 membership reports */
340: k_join(igmp_socket, allreports_group, v);
341:
342: /* Until neighbors are discovered, assume responsibility for sending
343: * periodic group membership queries to the subnet. Send the first
344: * query. */
345: v->uv_flags |= VIFF_QUERIER;
346: query_groups(v);
347:
348: /* Send a probe via the new vif to look for neighbors. */
349: send_pim_hello(v, pim_timer_hello_holdtime);
350: }
351: #ifdef __linux__
352: else {
353: struct ifreq ifr;
354:
355: memset(&ifr, 0, sizeof(struct ifreq));
356:
357: if (mrt_table_id != 0) {
358: logit(LOG_INFO, 0, "Initializing pimreg%u", mrt_table_id);
359: snprintf(ifr.ifr_name, IFNAMSIZ, "pimreg%u", mrt_table_id);
360: } else {
361: strlcpy(ifr.ifr_name, "pimreg", IFNAMSIZ);
362: }
363:
364: if (ioctl(udp_socket, SIOGIFINDEX, (char *) &ifr) < 0) {
365: logit(LOG_ERR, errno, "ioctl SIOGIFINDEX for %s", ifr.ifr_name);
366: /* Not reached */
367: return;
368: }
369:
370: v->uv_ifindex = ifr.ifr_ifindex;
371: }
372: #endif /* __linux__ */
373: }
374:
375:
376: /*
377: * Stop a vif (either physical interface, tunnel or
378: * register.) If we are running only PIM we don't have tunnels.
379: */
380: static void stop_vif(vifi_t vifi)
381: {
382: struct uvif *v;
383: struct listaddr *a, *b;
384: pim_nbr_entry_t *n, *next;
385: struct vif_acl *acl;
386:
387: /*
388: * TODO: make sure that the kernel viftable is
389: * consistent with the daemon table
390: */
391: v = &uvifs[vifi];
392: if (!(v->uv_flags & VIFF_REGISTER)) {
393: k_leave(pim_socket, allpimrouters_group, v);
394: k_leave(igmp_socket, allrouters_group, v);
395: k_leave(igmp_socket, allreports_group, v);
396:
397: /* Discard all group addresses. (No need to tell kernel;
398: * the k_del_vif() call will clean up kernel state.) */
399: while (v->uv_groups) {
400: a = v->uv_groups;
401: v->uv_groups = a->al_next;
402:
403: while (a->al_sources) {
404: b = a->al_sources;
405: a->al_sources = a->al_next;
406: free(b);
407: }
408:
409: free(a);
410: }
411: }
412:
413: /*
414: * TODO: inform (eventually) the neighbors I am going down by sending
415: * PIM_HELLO with holdtime=0 so someone else should become a DR.
416: */
417: /* TODO: dummy! Implement it!! Any problems if don't use it? */
418: delete_vif_from_mrt(vifi);
419:
420: /* Delete the interface from the kernel's vif structure. */
421: k_del_vif(igmp_socket, vifi, v);
422:
423: v->uv_flags = (v->uv_flags & ~VIFF_DR & ~VIFF_QUERIER & ~VIFF_NONBRS) | VIFF_DOWN;
424: if (!(v->uv_flags & VIFF_REGISTER)) {
425: RESET_TIMER(v->uv_hello_timer);
426: RESET_TIMER(v->uv_jp_timer);
427: RESET_TIMER(v->uv_gq_timer);
428:
429: for (n = v->uv_pim_neighbors; n; n = next) {
430: next = n->next; /* Free the space for each neighbour */
431: delete_pim_nbr(n);
432: }
433: v->uv_pim_neighbors = NULL;
434: }
435:
436: /* TODO: currently not used */
437: /* The Access Control List (list with the scoped addresses) */
438: while (v->uv_acl) {
439: acl = v->uv_acl;
440: v->uv_acl = acl->acl_next;
441: free(acl);
442: }
443:
444: vifs_down = TRUE;
445: logit(LOG_INFO, 0, "Interface %s goes down; vif #%u out of service", v->uv_name, vifi);
446: }
447:
448:
449: /*
450: * Update the register vif in the multicast routing daemon and the
451: * kernel because the interface used initially to get its local address
452: * is DOWN. register_vifi is the index to the Register vif which needs
453: * to be updated. As a result the Register vif has a new uv_lcl_addr and
454: * is UP (virtually :))
455: */
456: static int update_reg_vif(vifi_t register_vifi)
457: {
458: struct uvif *v;
459: vifi_t vifi;
460:
461: /* Find the first useable vif with solid physical background */
462: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
463: if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_REGISTER | VIFF_TUNNEL))
464: continue;
465:
466: /* Found. Stop the bogus Register vif first */
467: stop_vif(register_vifi);
468: uvifs[register_vifi].uv_lcl_addr = uvifs[vifi].uv_lcl_addr;
469:
470: start_vif(register_vifi);
471: IF_DEBUG(DEBUG_PIM_REGISTER | DEBUG_IF) {
472: logit(LOG_NOTICE, 0, "Interface %s has come up; vif #%u now in service",
473: uvifs[register_vifi].uv_name, register_vifi);
474: }
475:
476: return 0;
477: }
478:
479: vifs_down = TRUE;
480: logit(LOG_WARNING, 0, "Cannot start Register vif: %s", uvifs[vifi].uv_name);
481:
482: return -1;
483: }
484:
485:
486: /*
487: * See if any interfaces have changed from up state to down, or vice versa,
488: * including any non-multicast-capable interfaces that are in use as local
489: * tunnel end-points. Ignore interfaces that have been administratively
490: * disabled.
491: */
492: void check_vif_state(void)
493: {
494: vifi_t vifi;
495: struct uvif *v;
496: struct ifreq ifr;
497: static int checking_vifs = 0;
498:
499: /*
500: * XXX: TODO: True only for DVMRP?? Check.
501: * If we get an error while checking, (e.g. two interfaces go down
502: * at once, and we decide to send a prune out one of the failed ones)
503: * then don't go into an infinite loop!
504: */
505: if (checking_vifs)
506: return;
507:
508: vifs_down = FALSE;
509: checking_vifs = 1;
510:
511: /* TODO: Check all potential interfaces!!! */
512: /* Check the physical and tunnels only */
513: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
514: if (v->uv_flags & (VIFF_DISABLED | VIFF_REGISTER))
515: continue;
516:
517: /* get the interface flags */
518: strlcpy(ifr.ifr_name, v->uv_name, sizeof(ifr.ifr_name));
519: if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ifr) < 0) {
520: if (errno == ENODEV) {
521: logit(LOG_NOTICE, 0, "Interface %s has gone; vif #%u taken out of service", v->uv_name, vifi);
522: stop_vif(vifi);
523: vifs_down = TRUE;
524: continue;
525: }
526:
527: logit(LOG_ERR, errno, "check_vif_state: ioctl SIOCGIFFLAGS for %s", ifr.ifr_name);
528: }
529:
530: if (v->uv_flags & VIFF_DOWN) {
531: if (ifr.ifr_flags & IFF_UP)
532: start_vif(vifi);
533: else
534: vifs_down = TRUE;
535: } else {
536: if (!(ifr.ifr_flags & IFF_UP)) {
537: logit(LOG_NOTICE, 0, "Interface %s has gone down; vif #%u taken out of service", v->uv_name, vifi);
538: stop_vif(vifi);
539: vifs_down = TRUE;
540: }
541: }
542: }
543:
544: /* Check the register(s) vif(s) */
545: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
546: vifi_t vifi2;
547: struct uvif *v2;
548: int found;
549:
550: if (!(v->uv_flags & VIFF_REGISTER))
551: continue;
552:
553: found = 0;
554:
555: /* Find a physical vif with the same IP address as the
556: * Register vif. */
557: for (vifi2 = 0, v2 = uvifs; vifi2 < numvifs; ++vifi2, ++v2) {
558: if (v2->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_REGISTER | VIFF_TUNNEL))
559: continue;
560:
561: if (v->uv_lcl_addr != v2->uv_lcl_addr)
562: continue;
563:
564: found = 1;
565: break;
566: }
567:
568: /* The physical interface with the IP address as the Register
569: * vif is probably DOWN. Get a replacement. */
570: if (!found)
571: update_reg_vif(vifi);
572: }
573:
574: checking_vifs = 0;
575: }
576:
577:
578: /*
579: * If the source is directly connected to us, find the vif number for
580: * the corresponding physical interface (Register and tunnels excluded).
581: * Local addresses are excluded.
582: * Return the vif number or NO_VIF if not found.
583: */
584: vifi_t find_vif_direct(uint32_t src)
585: {
586: vifi_t vifi;
587: struct uvif *v;
588: struct phaddr *p;
589:
590: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
591: if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_REGISTER | VIFF_TUNNEL))
592: continue;
593:
594: if (src == v->uv_lcl_addr)
595: return NO_VIF; /* src is one of our IP addresses */
596:
597: if (is_uv_subnet(src, v))
598: return vifi;
599:
600: /* Check the extra subnets for this vif */
601: /* TODO: don't think currently pimd can handle extra subnets */
602: for (p = v->uv_addrs; p; p = p->pa_next) {
603: if (is_pa_subnet(src, v))
604: return vifi;
605: }
606:
607: /* POINTOPOINT but not VIFF_TUNNEL interface (e.g., GRE) */
608: if ((v->uv_flags & VIFF_POINT_TO_POINT) && (src == v->uv_rmt_addr))
609: return vifi;
610: }
611:
612: return NO_VIF;
613: }
614:
615:
616: /*
617: * Checks if src is local address. If "yes" return the vif index,
618: * otherwise return value is NO_VIF.
619: */
620: vifi_t local_address(uint32_t src)
621: {
622: vifi_t vifi;
623: struct uvif *v;
624:
625: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
626: /* TODO: XXX: what about VIFF_TUNNEL? */
627: if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_REGISTER))
628: continue;
629:
630: if (src == v->uv_lcl_addr)
631: return vifi;
632: }
633:
634: /* Returning NO_VIF means not a local address */
635: return NO_VIF;
636: }
637:
638: /*
639: * If the source is directly connected, or is local address,
640: * find the vif number for the corresponding physical interface
641: * (Register and tunnels excluded).
642: * Return the vif number or NO_VIF if not found.
643: */
644: vifi_t find_vif_direct_local(uint32_t src)
645: {
646: vifi_t vifi;
647: struct uvif *v;
648: struct phaddr *p;
649:
650: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
651: /* TODO: XXX: what about VIFF_TUNNEL? */
652: if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_REGISTER | VIFF_TUNNEL))
653: continue;
654:
655: if (src == v->uv_lcl_addr)
656: return vifi; /* src is one of our IP addresses */
657:
658: if (is_uv_subnet(src, v))
659: return vifi;
660:
661: /* Check the extra subnets for this vif */
662: /* TODO: don't think currently pimd can handle extra subnets */
663: for (p = v->uv_addrs; p; p = p->pa_next) {
664: if (is_pa_subnet(src, v))
665: return vifi;
666: }
667:
668: /* POINTOPOINT but not VIFF_TUNNEL interface (e.g., GRE) */
669: if ((v->uv_flags & VIFF_POINT_TO_POINT) && (src == v->uv_rmt_addr))
670: return vifi;
671: }
672:
673: return NO_VIF;
674: }
675:
676: /*
677: * Returns the highest address of local vif that is UP and ENABLED.
678: * The VIFF_REGISTER interface(s) is/are excluded.
679: */
680: uint32_t max_local_address(void)
681: {
682: vifi_t vifi;
683: struct uvif *v;
684: uint32_t max_address = 0;
685:
686: for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
687: /* Count vif if not DISABLED or DOWN */
688: /* TODO: XXX: What about VIFF_TUNNEL? */
689: if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_REGISTER))
690: continue;
691:
692: if (ntohl(v->uv_lcl_addr) > ntohl(max_address))
693: max_address = v->uv_lcl_addr;
694: }
695:
696: return max_address;
697: }
698:
699: /**
700: * Local Variables:
701: * version-control: t
702: * indent-tabs-mode: t
703: * c-file-style: "ellemtel"
704: * c-basic-offset: 4
705: * End:
706: */
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to vif.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / pimd