1: /*
2: * Address linked list routine.
3: * Copyright (C) 1997, 98 Kunihiro Ishiguro
4: *
5: * This file is part of GNU Zebra.
6: *
7: * GNU Zebra is free software; you can redistribute it and/or modify it
8: * under the terms of the GNU General Public License as published by the
9: * Free Software Foundation; either version 2, or (at your option) any
10: * later version.
11: *
12: * GNU Zebra is distributed in the hope that it will be useful, but
13: * WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with GNU Zebra; see the file COPYING. If not, write to the Free
19: * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20: * 02111-1307, USA.
21: */
22:
23: #include <zebra.h>
24:
25: #include "prefix.h"
26: #include "linklist.h"
27: #include "if.h"
28: #include "table.h"
29: #include "rib.h"
30: #include "table.h"
31: #include "log.h"
32: #include "memory.h"
33:
34: #include "zebra/zserv.h"
35: #include "zebra/redistribute.h"
36: #include "zebra/interface.h"
37: #include "zebra/connected.h"
38: extern struct zebra_t zebrad;
39:
40: /* withdraw a connected address */
41: static void
42: connected_withdraw (struct connected *ifc)
43: {
44: if (! ifc)
45: return;
46:
47: /* Update interface address information to protocol daemon. */
48: if (CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
49: {
50: zebra_interface_address_delete_update (ifc->ifp, ifc);
51:
52: if_subnet_delete (ifc->ifp, ifc);
53:
54: if (ifc->address->family == AF_INET)
55: connected_down_ipv4 (ifc->ifp, ifc);
56: #ifdef HAVE_IPV6
57: else
58: connected_down_ipv6 (ifc->ifp, ifc);
59: #endif
60:
61: UNSET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
62: }
63:
64: if (!CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
65: {
66: listnode_delete (ifc->ifp->connected, ifc);
67: connected_free (ifc);
68: }
69: }
70:
71: static void
72: connected_announce (struct interface *ifp, struct connected *ifc)
73: {
74: if (!ifc)
75: return;
76:
77: listnode_add (ifp->connected, ifc);
78:
79: /* Update interface address information to protocol daemon. */
80: if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
81: {
82: if (ifc->address->family == AF_INET)
83: if_subnet_add (ifp, ifc);
84:
85: SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
86:
87: zebra_interface_address_add_update (ifp, ifc);
88:
89: if (if_is_operative(ifp))
90: {
91: if (ifc->address->family == AF_INET)
92: connected_up_ipv4 (ifp, ifc);
93: #ifdef HAVE_IPV6
94: else
95: connected_up_ipv6 (ifp, ifc);
96: #endif
97: }
98: }
99: }
100:
101: /* If same interface address is already exist... */
102: struct connected *
103: connected_check (struct interface *ifp, struct prefix *p)
104: {
105: struct connected *ifc;
106: struct listnode *node;
107:
108: for (ALL_LIST_ELEMENTS_RO (ifp->connected, node, ifc))
109: if (prefix_same (ifc->address, p))
110: return ifc;
111:
112: return NULL;
113: }
114:
115: /* Check if two ifc's describe the same address */
116: static int
117: connected_same (struct connected *ifc1, struct connected *ifc2)
118: {
119: if (ifc1->ifp != ifc2->ifp)
120: return 0;
121:
122: if (ifc1->destination)
123: if (!ifc2->destination)
124: return 0;
125: if (ifc2->destination)
126: if (!ifc1->destination)
127: return 0;
128:
129: if (ifc1->destination && ifc2->destination)
130: if (!prefix_same (ifc1->destination, ifc2->destination))
131: return 0;
132:
133: if (ifc1->flags != ifc2->flags)
134: return 0;
135:
136: return 1;
137: }
138:
139: /* Handle implicit withdrawals of addresses, where a system ADDs an address
140: * to an interface which already has the same address configured.
141: *
142: * Returns the struct connected which must be announced to clients,
143: * or NULL if nothing to do.
144: */
145: static struct connected *
146: connected_implicit_withdraw (struct interface *ifp, struct connected *ifc)
147: {
148: struct connected *current;
149:
150: /* Check same connected route. */
151: if ((current = connected_check (ifp, (struct prefix *) ifc->address)))
152: {
153: if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
154: SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
155:
156: /* Avoid spurious withdraws, this might be just the kernel 'reflecting'
157: * back an address we have already added.
158: */
159: if (connected_same (current, ifc) && CHECK_FLAG(current->conf, ZEBRA_IFC_REAL))
160: {
161: /* nothing to do */
162: connected_free (ifc);
163: return NULL;
164: }
165:
166: UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
167: connected_withdraw (current); /* implicit withdraw - freebsd does this */
168: }
169: return ifc;
170: }
171:
172: /* Called from if_up(). */
173: void
174: connected_up_ipv4 (struct interface *ifp, struct connected *ifc)
175: {
176: struct prefix_ipv4 p;
177:
178: if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
179: return;
180:
181: PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
182:
183: /* Apply mask to the network. */
184: apply_mask_ipv4 (&p);
185:
186: /* In case of connected address is 0.0.0.0/0 we treat it tunnel
187: address. */
188: if (prefix_ipv4_any (&p))
189: return;
190:
191: rib_add_ipv4 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, NULL, ifp->ifindex,
192: RT_TABLE_MAIN, ifp->metric, 0);
193:
194: rib_update ();
195: }
196:
197: /* Add connected IPv4 route to the interface. */
198: void
199: connected_add_ipv4 (struct interface *ifp, int flags, struct in_addr *addr,
200: u_char prefixlen, struct in_addr *broad,
201: const char *label)
202: {
203: struct prefix_ipv4 *p;
204: struct connected *ifc;
205:
206: /* Make connected structure. */
207: ifc = connected_new ();
208: ifc->ifp = ifp;
209: ifc->flags = flags;
210:
211: /* Allocate new connected address. */
212: p = prefix_ipv4_new ();
213: p->family = AF_INET;
214: p->prefix = *addr;
215: p->prefixlen = prefixlen;
216: ifc->address = (struct prefix *) p;
217:
218: /* If there is broadcast or peer address. */
219: if (broad)
220: {
221: p = prefix_ipv4_new ();
222: p->family = AF_INET;
223: p->prefix = *broad;
224: p->prefixlen = prefixlen;
225: ifc->destination = (struct prefix *) p;
226:
227: /* validate the destination address */
228: if (CONNECTED_PEER(ifc))
229: {
230: if (IPV4_ADDR_SAME(addr,broad))
231: zlog_warn("warning: interface %s has same local and peer "
232: "address %s, routing protocols may malfunction",
233: ifp->name,inet_ntoa(*addr));
234: }
235: else
236: {
237: if (broad->s_addr != ipv4_broadcast_addr(addr->s_addr,prefixlen))
238: {
239: char buf[2][INET_ADDRSTRLEN];
240: struct in_addr bcalc;
241: bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,prefixlen);
242: zlog_warn("warning: interface %s broadcast addr %s/%d != "
243: "calculated %s, routing protocols may malfunction",
244: ifp->name,
245: inet_ntop (AF_INET, broad, buf[0], sizeof(buf[0])),
246: prefixlen,
247: inet_ntop (AF_INET, &bcalc, buf[1], sizeof(buf[1])));
248: }
249: }
250:
251: }
252: else
253: {
254: if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER))
255: {
256: zlog_warn("warning: %s called for interface %s "
257: "with peer flag set, but no peer address supplied",
258: __func__, ifp->name);
259: UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
260: }
261:
262: /* no broadcast or destination address was supplied */
263: if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
264: zlog_warn("warning: PtP interface %s with addr %s/%d needs a "
265: "peer address",ifp->name,inet_ntoa(*addr),prefixlen);
266: }
267:
268: /* Label of this address. */
269: if (label)
270: ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);
271:
272: /* nothing to do? */
273: if ((ifc = connected_implicit_withdraw (ifp, ifc)) == NULL)
274: return;
275:
276: connected_announce (ifp, ifc);
277: }
278:
279: void
280: connected_down_ipv4 (struct interface *ifp, struct connected *ifc)
281: {
282: struct prefix_ipv4 p;
283:
284: if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
285: return;
286:
287: PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
288:
289: /* Apply mask to the network. */
290: apply_mask_ipv4 (&p);
291:
292: /* In case of connected address is 0.0.0.0/0 we treat it tunnel
293: address. */
294: if (prefix_ipv4_any (&p))
295: return;
296:
297: /* Same logic as for connected_up_ipv4(): push the changes into the head. */
298: rib_delete_ipv4 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, 0);
299:
300: rib_update ();
301: }
302:
303: /* Delete connected IPv4 route to the interface. */
304: void
305: connected_delete_ipv4 (struct interface *ifp, int flags, struct in_addr *addr,
306: u_char prefixlen, struct in_addr *broad)
307: {
308: struct prefix_ipv4 p;
309: struct connected *ifc;
310:
311: memset (&p, 0, sizeof (struct prefix_ipv4));
312: p.family = AF_INET;
313: p.prefix = *addr;
314: p.prefixlen = prefixlen;
315:
316: ifc = connected_check (ifp, (struct prefix *) &p);
317: if (! ifc)
318: return;
319:
320: connected_withdraw (ifc);
321:
322: rib_update();
323: }
324:
325: #ifdef HAVE_IPV6
326: void
327: connected_up_ipv6 (struct interface *ifp, struct connected *ifc)
328: {
329: struct prefix_ipv6 p;
330:
331: if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
332: return;
333:
334: PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
335:
336: /* Apply mask to the network. */
337: apply_mask_ipv6 (&p);
338:
339: #if ! defined (MUSICA) && ! defined (LINUX)
340: /* XXX: It is already done by rib_bogus_ipv6 within rib_add_ipv6 */
341: if (IN6_IS_ADDR_UNSPECIFIED (&p.prefix))
342: return;
343: #endif
344:
345: rib_add_ipv6 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, RT_TABLE_MAIN,
346: ifp->metric, 0);
347:
348: rib_update ();
349: }
350:
351: /* Add connected IPv6 route to the interface. */
352: void
353: connected_add_ipv6 (struct interface *ifp, int flags, struct in6_addr *addr,
354: u_char prefixlen, struct in6_addr *broad,
355: const char *label)
356: {
357: struct prefix_ipv6 *p;
358: struct connected *ifc;
359:
360: /* Make connected structure. */
361: ifc = connected_new ();
362: ifc->ifp = ifp;
363: ifc->flags = flags;
364:
365: /* Allocate new connected address. */
366: p = prefix_ipv6_new ();
367: p->family = AF_INET6;
368: IPV6_ADDR_COPY (&p->prefix, addr);
369: p->prefixlen = prefixlen;
370: ifc->address = (struct prefix *) p;
371:
372: /* If there is broadcast or peer address. */
373: if (broad)
374: {
375: if (IN6_IS_ADDR_UNSPECIFIED(broad))
376: zlog_warn("warning: %s called for interface %s with unspecified "
377: "destination address; ignoring!", __func__, ifp->name);
378: else
379: {
380: p = prefix_ipv6_new ();
381: p->family = AF_INET6;
382: IPV6_ADDR_COPY (&p->prefix, broad);
383: p->prefixlen = prefixlen;
384: ifc->destination = (struct prefix *) p;
385: }
386: }
387: if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER) && !ifc->destination)
388: {
389: zlog_warn("warning: %s called for interface %s "
390: "with peer flag set, but no peer address supplied",
391: __func__, ifp->name);
392: UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
393: }
394:
395: /* Label of this address. */
396: if (label)
397: ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);
398:
399: if ((ifc = connected_implicit_withdraw (ifp, ifc)) == NULL)
400: return;
401:
402: connected_announce (ifp, ifc);
403: }
404:
405: void
406: connected_down_ipv6 (struct interface *ifp, struct connected *ifc)
407: {
408: struct prefix_ipv6 p;
409:
410: if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
411: return;
412:
413: PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
414:
415: apply_mask_ipv6 (&p);
416:
417: if (IN6_IS_ADDR_UNSPECIFIED (&p.prefix))
418: return;
419:
420: rib_delete_ipv6 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, 0);
421:
422: rib_update ();
423: }
424:
425: void
426: connected_delete_ipv6 (struct interface *ifp, struct in6_addr *address,
427: u_char prefixlen, struct in6_addr *broad)
428: {
429: struct prefix_ipv6 p;
430: struct connected *ifc;
431:
432: memset (&p, 0, sizeof (struct prefix_ipv6));
433: p.family = AF_INET6;
434: memcpy (&p.prefix, address, sizeof (struct in6_addr));
435: p.prefixlen = prefixlen;
436:
437: ifc = connected_check (ifp, (struct prefix *) &p);
438: if (! ifc)
439: return;
440:
441: connected_withdraw (ifc);
442:
443: rib_update();
444: }
445: #endif /* HAVE_IPV6 */
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