1: /* Zebra daemon server routine.
2: * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
3: *
4: * This file is part of GNU Zebra.
5: *
6: * GNU Zebra is free software; you can redistribute it and/or modify it
7: * under the terms of the GNU General Public License as published by the
8: * Free Software Foundation; either version 2, or (at your option) any
9: * later version.
10: *
11: * GNU Zebra is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License for more details.
15: *
16: * You should have received a copy of the GNU General Public License
17: * along with GNU Zebra; see the file COPYING. If not, write to the
18: * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19: * Boston, MA 02111-1307, USA.
20: */
21:
22: #include <zebra.h>
23:
24: #include "prefix.h"
25: #include "command.h"
26: #include "if.h"
27: #include "thread.h"
28: #include "stream.h"
29: #include "memory.h"
30: #include "table.h"
31: #include "rib.h"
32: #include "network.h"
33: #include "sockunion.h"
34: #include "log.h"
35: #include "zclient.h"
36: #include "privs.h"
37: #include "network.h"
38: #include "buffer.h"
39:
40: #include "zebra/zserv.h"
41: #include "zebra/router-id.h"
42: #include "zebra/redistribute.h"
43: #include "zebra/debug.h"
44: #include "zebra/ipforward.h"
45:
46: /* Event list of zebra. */
47: enum event { ZEBRA_SERV, ZEBRA_READ, ZEBRA_WRITE };
48:
49: extern struct zebra_t zebrad;
50:
51: static void zebra_event (enum event event, int sock, struct zserv *client);
52:
53: extern struct zebra_privs_t zserv_privs;
54:
55: static void zebra_client_close (struct zserv *client);
56:
57: static int
58: zserv_delayed_close(struct thread *thread)
59: {
60: struct zserv *client = THREAD_ARG(thread);
61:
62: client->t_suicide = NULL;
63: zebra_client_close(client);
64: return 0;
65: }
66:
67: /* When client connects, it sends hello message
68: * with promise to send zebra routes of specific type.
69: * Zebra stores a socket fd of the client into
70: * this array. And use it to clean up routes that
71: * client didn't remove for some reasons after closing
72: * connection.
73: */
74: static int route_type_oaths[ZEBRA_ROUTE_MAX];
75:
76: static int
77: zserv_flush_data(struct thread *thread)
78: {
79: struct zserv *client = THREAD_ARG(thread);
80:
81: client->t_write = NULL;
82: if (client->t_suicide)
83: {
84: zebra_client_close(client);
85: return -1;
86: }
87: switch (buffer_flush_available(client->wb, client->sock))
88: {
89: case BUFFER_ERROR:
90: zlog_warn("%s: buffer_flush_available failed on zserv client fd %d, "
91: "closing", __func__, client->sock);
92: zebra_client_close(client);
93: break;
94: case BUFFER_PENDING:
95: client->t_write = thread_add_write(zebrad.master, zserv_flush_data,
96: client, client->sock);
97: break;
98: case BUFFER_EMPTY:
99: break;
100: }
101: return 0;
102: }
103:
104: static int
105: zebra_server_send_message(struct zserv *client)
106: {
107: if (client->t_suicide)
108: return -1;
109: switch (buffer_write(client->wb, client->sock, STREAM_DATA(client->obuf),
110: stream_get_endp(client->obuf)))
111: {
112: case BUFFER_ERROR:
113: zlog_warn("%s: buffer_write failed to zserv client fd %d, closing",
114: __func__, client->sock);
115: /* Schedule a delayed close since many of the functions that call this
116: one do not check the return code. They do not allow for the
117: possibility that an I/O error may have caused the client to be
118: deleted. */
119: client->t_suicide = thread_add_event(zebrad.master, zserv_delayed_close,
120: client, 0);
121: return -1;
122: case BUFFER_EMPTY:
123: THREAD_OFF(client->t_write);
124: break;
125: case BUFFER_PENDING:
126: THREAD_WRITE_ON(zebrad.master, client->t_write,
127: zserv_flush_data, client, client->sock);
128: break;
129: }
130: return 0;
131: }
132:
133: static void
134: zserv_create_header (struct stream *s, uint16_t cmd)
135: {
136: /* length placeholder, caller can update */
137: stream_putw (s, ZEBRA_HEADER_SIZE);
138: stream_putc (s, ZEBRA_HEADER_MARKER);
139: stream_putc (s, ZSERV_VERSION);
140: stream_putw (s, cmd);
141: }
142:
143: static void
144: zserv_encode_interface (struct stream *s, struct interface *ifp)
145: {
146: /* Interface information. */
147: stream_put (s, ifp->name, INTERFACE_NAMSIZ);
148: stream_putl (s, ifp->ifindex);
149: stream_putc (s, ifp->status);
150: stream_putq (s, ifp->flags);
151: stream_putl (s, ifp->metric);
152: stream_putl (s, ifp->mtu);
153: stream_putl (s, ifp->mtu6);
154: stream_putl (s, ifp->bandwidth);
155: #ifdef HAVE_STRUCT_SOCKADDR_DL
156: stream_put (s, &ifp->sdl, sizeof (ifp->sdl));
157: #else
158: stream_putl (s, ifp->hw_addr_len);
159: if (ifp->hw_addr_len)
160: stream_put (s, ifp->hw_addr, ifp->hw_addr_len);
161: #endif /* HAVE_STRUCT_SOCKADDR_DL */
162:
163: /* Write packet size. */
164: stream_putw_at (s, 0, stream_get_endp (s));
165: }
166:
167: /* Interface is added. Send ZEBRA_INTERFACE_ADD to client. */
168: /*
169: * This function is called in the following situations:
170: * - in response to a 3-byte ZEBRA_INTERFACE_ADD request
171: * from the client.
172: * - at startup, when zebra figures out the available interfaces
173: * - when an interface is added (where support for
174: * RTM_IFANNOUNCE or AF_NETLINK sockets is available), or when
175: * an interface is marked IFF_UP (i.e., an RTM_IFINFO message is
176: * received)
177: */
178: int
179: zsend_interface_add (struct zserv *client, struct interface *ifp)
180: {
181: struct stream *s;
182:
183: /* Check this client need interface information. */
184: if (! client->ifinfo)
185: return 0;
186:
187: s = client->obuf;
188: stream_reset (s);
189:
190: zserv_create_header (s, ZEBRA_INTERFACE_ADD);
191: zserv_encode_interface (s, ifp);
192:
193: return zebra_server_send_message(client);
194: }
195:
196: /* Interface deletion from zebra daemon. */
197: int
198: zsend_interface_delete (struct zserv *client, struct interface *ifp)
199: {
200: struct stream *s;
201:
202: /* Check this client need interface information. */
203: if (! client->ifinfo)
204: return 0;
205:
206: s = client->obuf;
207: stream_reset (s);
208:
209: zserv_create_header (s, ZEBRA_INTERFACE_DELETE);
210: zserv_encode_interface (s, ifp);
211:
212: return zebra_server_send_message (client);
213: }
214:
215: /* Interface address is added/deleted. Send ZEBRA_INTERFACE_ADDRESS_ADD or
216: * ZEBRA_INTERFACE_ADDRESS_DELETE to the client.
217: *
218: * A ZEBRA_INTERFACE_ADDRESS_ADD is sent in the following situations:
219: * - in response to a 3-byte ZEBRA_INTERFACE_ADD request
220: * from the client, after the ZEBRA_INTERFACE_ADD has been
221: * sent from zebra to the client
222: * - redistribute new address info to all clients in the following situations
223: * - at startup, when zebra figures out the available interfaces
224: * - when an interface is added (where support for
225: * RTM_IFANNOUNCE or AF_NETLINK sockets is available), or when
226: * an interface is marked IFF_UP (i.e., an RTM_IFINFO message is
227: * received)
228: * - for the vty commands "ip address A.B.C.D/M [<secondary>|<label LINE>]"
229: * and "no bandwidth <1-10000000>", "ipv6 address X:X::X:X/M"
230: * - when an RTM_NEWADDR message is received from the kernel,
231: *
232: * The call tree that triggers ZEBRA_INTERFACE_ADDRESS_DELETE:
233: *
234: * zsend_interface_address(DELETE)
235: * ^
236: * |
237: * zebra_interface_address_delete_update
238: * ^ ^ ^
239: * | | if_delete_update
240: * | |
241: * ip_address_uninstall connected_delete_ipv4
242: * [ipv6_addresss_uninstall] [connected_delete_ipv6]
243: * ^ ^
244: * | |
245: * | RTM_NEWADDR on routing/netlink socket
246: * |
247: * vty commands:
248: * "no ip address A.B.C.D/M [label LINE]"
249: * "no ip address A.B.C.D/M secondary"
250: * ["no ipv6 address X:X::X:X/M"]
251: *
252: */
253: int
254: zsend_interface_address (int cmd, struct zserv *client,
255: struct interface *ifp, struct connected *ifc)
256: {
257: int blen;
258: struct stream *s;
259: struct prefix *p;
260:
261: /* Check this client need interface information. */
262: if (! client->ifinfo)
263: return 0;
264:
265: s = client->obuf;
266: stream_reset (s);
267:
268: zserv_create_header (s, cmd);
269: stream_putl (s, ifp->ifindex);
270:
271: /* Interface address flag. */
272: stream_putc (s, ifc->flags);
273:
274: /* Prefix information. */
275: p = ifc->address;
276: stream_putc (s, p->family);
277: blen = prefix_blen (p);
278: stream_put (s, &p->u.prefix, blen);
279:
280: /*
281: * XXX gnu version does not send prefixlen for ZEBRA_INTERFACE_ADDRESS_DELETE
282: * but zebra_interface_address_delete_read() in the gnu version
283: * expects to find it
284: */
285: stream_putc (s, p->prefixlen);
286:
287: /* Destination. */
288: p = ifc->destination;
289: if (p)
290: stream_put (s, &p->u.prefix, blen);
291: else
292: stream_put (s, NULL, blen);
293:
294: /* Write packet size. */
295: stream_putw_at (s, 0, stream_get_endp (s));
296:
297: return zebra_server_send_message(client);
298: }
299:
300: /*
301: * The cmd passed to zsend_interface_update may be ZEBRA_INTERFACE_UP or
302: * ZEBRA_INTERFACE_DOWN.
303: *
304: * The ZEBRA_INTERFACE_UP message is sent from the zebra server to
305: * the clients in one of 2 situations:
306: * - an if_up is detected e.g., as a result of an RTM_IFINFO message
307: * - a vty command modifying the bandwidth of an interface is received.
308: * The ZEBRA_INTERFACE_DOWN message is sent when an if_down is detected.
309: */
310: int
311: zsend_interface_update (int cmd, struct zserv *client, struct interface *ifp)
312: {
313: struct stream *s;
314:
315: /* Check this client need interface information. */
316: if (! client->ifinfo)
317: return 0;
318:
319: s = client->obuf;
320: stream_reset (s);
321:
322: zserv_create_header (s, cmd);
323: zserv_encode_interface (s, ifp);
324:
325: return zebra_server_send_message(client);
326: }
327:
328: /*
329: * The zebra server sends the clients a ZEBRA_IPV4_ROUTE_ADD or a
330: * ZEBRA_IPV6_ROUTE_ADD via zsend_route_multipath in the following
331: * situations:
332: * - when the client starts up, and requests default information
333: * by sending a ZEBRA_REDISTRIBUTE_DEFAULT_ADD to the zebra server, in the
334: * - case of rip, ripngd, ospfd and ospf6d, when the client sends a
335: * ZEBRA_REDISTRIBUTE_ADD as a result of the "redistribute" vty cmd,
336: * - when the zebra server redistributes routes after it updates its rib
337: *
338: * The zebra server sends clients a ZEBRA_IPV4_ROUTE_DELETE or a
339: * ZEBRA_IPV6_ROUTE_DELETE via zsend_route_multipath when:
340: * - a "ip route" or "ipv6 route" vty command is issued, a prefix is
341: * - deleted from zebra's rib, and this info
342: * has to be redistributed to the clients
343: *
344: * XXX The ZEBRA_IPV*_ROUTE_ADD message is also sent by the client to the
345: * zebra server when the client wants to tell the zebra server to add a
346: * route to the kernel (zapi_ipv4_add etc. ). Since it's essentially the
347: * same message being sent back and forth, this function and
348: * zapi_ipv{4,6}_{add, delete} should be re-written to avoid code
349: * duplication.
350: */
351: int
352: zsend_route_multipath (int cmd, struct zserv *client, struct prefix *p,
353: struct rib *rib)
354: {
355: int psize;
356: struct stream *s;
357: struct nexthop *nexthop;
358: unsigned long nhnummark = 0, messmark = 0;
359: int nhnum = 0;
360: u_char zapi_flags = 0;
361:
362: s = client->obuf;
363: stream_reset (s);
364:
365: zserv_create_header (s, cmd);
366:
367: /* Put type and nexthop. */
368: stream_putc (s, rib->type);
369: stream_putc (s, rib->flags);
370:
371: /* marker for message flags field */
372: messmark = stream_get_endp (s);
373: stream_putc (s, 0);
374:
375: /* Prefix. */
376: psize = PSIZE (p->prefixlen);
377: stream_putc (s, p->prefixlen);
378: stream_write (s, (u_char *) & p->u.prefix, psize);
379:
380: /*
381: * XXX The message format sent by zebra below does not match the format
382: * of the corresponding message expected by the zebra server
383: * itself (e.g., see zread_ipv4_add). The nexthop_num is not set correctly,
384: * (is there a bug on the client side if more than one segment is sent?)
385: * nexthop ZEBRA_NEXTHOP_IPV4 is never set, ZEBRA_NEXTHOP_IFINDEX
386: * is hard-coded.
387: */
388: /* Nexthop */
389:
390: for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
391: {
392: if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))
393: {
394: SET_FLAG (zapi_flags, ZAPI_MESSAGE_NEXTHOP);
395: SET_FLAG (zapi_flags, ZAPI_MESSAGE_IFINDEX);
396:
397: if (nhnummark == 0)
398: {
399: nhnummark = stream_get_endp (s);
400: stream_putc (s, 1); /* placeholder */
401: }
402:
403: nhnum++;
404:
405: switch(nexthop->type)
406: {
407: case NEXTHOP_TYPE_IPV4:
408: case NEXTHOP_TYPE_IPV4_IFINDEX:
409: stream_put_in_addr (s, &nexthop->gate.ipv4);
410: break;
411: #ifdef HAVE_IPV6
412: case NEXTHOP_TYPE_IPV6:
413: case NEXTHOP_TYPE_IPV6_IFINDEX:
414: case NEXTHOP_TYPE_IPV6_IFNAME:
415: stream_write (s, (u_char *) &nexthop->gate.ipv6, 16);
416: break;
417: #endif
418: default:
419: if (cmd == ZEBRA_IPV4_ROUTE_ADD
420: || cmd == ZEBRA_IPV4_ROUTE_DELETE)
421: {
422: struct in_addr empty;
423: memset (&empty, 0, sizeof (struct in_addr));
424: stream_write (s, (u_char *) &empty, IPV4_MAX_BYTELEN);
425: }
426: else
427: {
428: struct in6_addr empty;
429: memset (&empty, 0, sizeof (struct in6_addr));
430: stream_write (s, (u_char *) &empty, IPV6_MAX_BYTELEN);
431: }
432: }
433:
434: /* Interface index. */
435: stream_putc (s, 1);
436: stream_putl (s, nexthop->ifindex);
437:
438: break;
439: }
440: }
441:
442: /* Metric */
443: if (cmd == ZEBRA_IPV4_ROUTE_ADD || cmd == ZEBRA_IPV6_ROUTE_ADD)
444: {
445: SET_FLAG (zapi_flags, ZAPI_MESSAGE_DISTANCE);
446: stream_putc (s, rib->distance);
447: SET_FLAG (zapi_flags, ZAPI_MESSAGE_METRIC);
448: stream_putl (s, rib->metric);
449: }
450:
451: /* write real message flags value */
452: stream_putc_at (s, messmark, zapi_flags);
453:
454: /* Write next-hop number */
455: if (nhnummark)
456: stream_putc_at (s, nhnummark, nhnum);
457:
458: /* Write packet size. */
459: stream_putw_at (s, 0, stream_get_endp (s));
460:
461: return zebra_server_send_message(client);
462: }
463:
464: #ifdef HAVE_IPV6
465: static int
466: zsend_ipv6_nexthop_lookup (struct zserv *client, struct in6_addr *addr)
467: {
468: struct stream *s;
469: struct rib *rib;
470: unsigned long nump;
471: u_char num;
472: struct nexthop *nexthop;
473:
474: /* Lookup nexthop. */
475: rib = rib_match_ipv6 (addr);
476:
477: /* Get output stream. */
478: s = client->obuf;
479: stream_reset (s);
480:
481: /* Fill in result. */
482: zserv_create_header (s, ZEBRA_IPV6_NEXTHOP_LOOKUP);
483: stream_put (s, &addr, 16);
484:
485: if (rib)
486: {
487: stream_putl (s, rib->metric);
488: num = 0;
489: nump = stream_get_endp(s);
490: stream_putc (s, 0);
491: for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
492: if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))
493: {
494: stream_putc (s, nexthop->type);
495: switch (nexthop->type)
496: {
497: case ZEBRA_NEXTHOP_IPV6:
498: stream_put (s, &nexthop->gate.ipv6, 16);
499: break;
500: case ZEBRA_NEXTHOP_IPV6_IFINDEX:
501: case ZEBRA_NEXTHOP_IPV6_IFNAME:
502: stream_put (s, &nexthop->gate.ipv6, 16);
503: stream_putl (s, nexthop->ifindex);
504: break;
505: case ZEBRA_NEXTHOP_IFINDEX:
506: case ZEBRA_NEXTHOP_IFNAME:
507: stream_putl (s, nexthop->ifindex);
508: break;
509: default:
510: /* do nothing */
511: break;
512: }
513: num++;
514: }
515: stream_putc_at (s, nump, num);
516: }
517: else
518: {
519: stream_putl (s, 0);
520: stream_putc (s, 0);
521: }
522:
523: stream_putw_at (s, 0, stream_get_endp (s));
524:
525: return zebra_server_send_message(client);
526: }
527: #endif /* HAVE_IPV6 */
528:
529: static int
530: zsend_ipv4_nexthop_lookup (struct zserv *client, struct in_addr addr)
531: {
532: struct stream *s;
533: struct rib *rib;
534: unsigned long nump;
535: u_char num;
536: struct nexthop *nexthop;
537:
538: /* Lookup nexthop. */
539: rib = rib_match_ipv4 (addr);
540:
541: /* Get output stream. */
542: s = client->obuf;
543: stream_reset (s);
544:
545: /* Fill in result. */
546: zserv_create_header (s, ZEBRA_IPV4_NEXTHOP_LOOKUP);
547: stream_put_in_addr (s, &addr);
548:
549: if (rib)
550: {
551: stream_putl (s, rib->metric);
552: num = 0;
553: nump = stream_get_endp(s);
554: stream_putc (s, 0);
555: for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
556: if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))
557: {
558: stream_putc (s, nexthop->type);
559: switch (nexthop->type)
560: {
561: case ZEBRA_NEXTHOP_IPV4:
562: stream_put_in_addr (s, &nexthop->gate.ipv4);
563: break;
564: case ZEBRA_NEXTHOP_IFINDEX:
565: case ZEBRA_NEXTHOP_IFNAME:
566: stream_putl (s, nexthop->ifindex);
567: break;
568: default:
569: /* do nothing */
570: break;
571: }
572: num++;
573: }
574: stream_putc_at (s, nump, num);
575: }
576: else
577: {
578: stream_putl (s, 0);
579: stream_putc (s, 0);
580: }
581:
582: stream_putw_at (s, 0, stream_get_endp (s));
583:
584: return zebra_server_send_message(client);
585: }
586:
587: static int
588: zsend_ipv4_import_lookup (struct zserv *client, struct prefix_ipv4 *p)
589: {
590: struct stream *s;
591: struct rib *rib;
592: unsigned long nump;
593: u_char num;
594: struct nexthop *nexthop;
595:
596: /* Lookup nexthop. */
597: rib = rib_lookup_ipv4 (p);
598:
599: /* Get output stream. */
600: s = client->obuf;
601: stream_reset (s);
602:
603: /* Fill in result. */
604: zserv_create_header (s, ZEBRA_IPV4_IMPORT_LOOKUP);
605: stream_put_in_addr (s, &p->prefix);
606:
607: if (rib)
608: {
609: stream_putl (s, rib->metric);
610: num = 0;
611: nump = stream_get_endp(s);
612: stream_putc (s, 0);
613: for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
614: if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))
615: {
616: stream_putc (s, nexthop->type);
617: switch (nexthop->type)
618: {
619: case ZEBRA_NEXTHOP_IPV4:
620: stream_put_in_addr (s, &nexthop->gate.ipv4);
621: break;
622: case ZEBRA_NEXTHOP_IFINDEX:
623: case ZEBRA_NEXTHOP_IFNAME:
624: stream_putl (s, nexthop->ifindex);
625: break;
626: default:
627: /* do nothing */
628: break;
629: }
630: num++;
631: }
632: stream_putc_at (s, nump, num);
633: }
634: else
635: {
636: stream_putl (s, 0);
637: stream_putc (s, 0);
638: }
639:
640: stream_putw_at (s, 0, stream_get_endp (s));
641:
642: return zebra_server_send_message(client);
643: }
644:
645: /* Router-id is updated. Send ZEBRA_ROUTER_ID_ADD to client. */
646: int
647: zsend_router_id_update (struct zserv *client, struct prefix *p)
648: {
649: struct stream *s;
650: int blen;
651:
652: /* Check this client need interface information. */
653: if (!client->ridinfo)
654: return 0;
655:
656: s = client->obuf;
657: stream_reset (s);
658:
659: /* Message type. */
660: zserv_create_header (s, ZEBRA_ROUTER_ID_UPDATE);
661:
662: /* Prefix information. */
663: stream_putc (s, p->family);
664: blen = prefix_blen (p);
665: stream_put (s, &p->u.prefix, blen);
666: stream_putc (s, p->prefixlen);
667:
668: /* Write packet size. */
669: stream_putw_at (s, 0, stream_get_endp (s));
670:
671: return zebra_server_send_message(client);
672: }
673:
674: /* Register zebra server interface information. Send current all
675: interface and address information. */
676: static int
677: zread_interface_add (struct zserv *client, u_short length)
678: {
679: struct listnode *ifnode, *ifnnode;
680: struct listnode *cnode, *cnnode;
681: struct interface *ifp;
682: struct connected *c;
683:
684: /* Interface information is needed. */
685: client->ifinfo = 1;
686:
687: for (ALL_LIST_ELEMENTS (iflist, ifnode, ifnnode, ifp))
688: {
689: /* Skip pseudo interface. */
690: if (! CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE))
691: continue;
692:
693: if (zsend_interface_add (client, ifp) < 0)
694: return -1;
695:
696: for (ALL_LIST_ELEMENTS (ifp->connected, cnode, cnnode, c))
697: {
698: if (CHECK_FLAG (c->conf, ZEBRA_IFC_REAL) &&
699: (zsend_interface_address (ZEBRA_INTERFACE_ADDRESS_ADD, client,
700: ifp, c) < 0))
701: return -1;
702: }
703: }
704: return 0;
705: }
706:
707: /* Unregister zebra server interface information. */
708: static int
709: zread_interface_delete (struct zserv *client, u_short length)
710: {
711: client->ifinfo = 0;
712: return 0;
713: }
714:
715: /* This function support multiple nexthop. */
716: /*
717: * Parse the ZEBRA_IPV4_ROUTE_ADD sent from client. Update rib and
718: * add kernel route.
719: */
720: static int
721: zread_ipv4_add (struct zserv *client, u_short length)
722: {
723: int i;
724: struct rib *rib;
725: struct prefix_ipv4 p;
726: u_char message;
727: struct in_addr nexthop;
728: u_char nexthop_num;
729: u_char nexthop_type;
730: struct stream *s;
731: unsigned int ifindex;
732: u_char ifname_len;
733: safi_t safi;
734:
735:
736: /* Get input stream. */
737: s = client->ibuf;
738:
739: /* Allocate new rib. */
740: rib = XCALLOC (MTYPE_RIB, sizeof (struct rib));
741:
742: /* Type, flags, message. */
743: rib->type = stream_getc (s);
744: rib->flags = stream_getc (s);
745: message = stream_getc (s);
746: safi = stream_getw (s);
747: rib->uptime = time (NULL);
748:
749: /* IPv4 prefix. */
750: memset (&p, 0, sizeof (struct prefix_ipv4));
751: p.family = AF_INET;
752: p.prefixlen = stream_getc (s);
753: stream_get (&p.prefix, s, PSIZE (p.prefixlen));
754:
755: /* Nexthop parse. */
756: if (CHECK_FLAG (message, ZAPI_MESSAGE_NEXTHOP))
757: {
758: nexthop_num = stream_getc (s);
759:
760: for (i = 0; i < nexthop_num; i++)
761: {
762: nexthop_type = stream_getc (s);
763:
764: switch (nexthop_type)
765: {
766: case ZEBRA_NEXTHOP_IFINDEX:
767: ifindex = stream_getl (s);
768: nexthop_ifindex_add (rib, ifindex);
769: break;
770: case ZEBRA_NEXTHOP_IFNAME:
771: ifname_len = stream_getc (s);
772: stream_forward_getp (s, ifname_len);
773: break;
774: case ZEBRA_NEXTHOP_IPV4:
775: nexthop.s_addr = stream_get_ipv4 (s);
776: nexthop_ipv4_add (rib, &nexthop, NULL);
777: break;
778: case ZEBRA_NEXTHOP_IPV6:
779: stream_forward_getp (s, IPV6_MAX_BYTELEN);
780: break;
781: case ZEBRA_NEXTHOP_BLACKHOLE:
782: nexthop_blackhole_add (rib);
783: break;
784: }
785: }
786: }
787:
788: /* Distance. */
789: if (CHECK_FLAG (message, ZAPI_MESSAGE_DISTANCE))
790: rib->distance = stream_getc (s);
791:
792: /* Metric. */
793: if (CHECK_FLAG (message, ZAPI_MESSAGE_METRIC))
794: rib->metric = stream_getl (s);
795:
796: /* Table */
797: rib->table=zebrad.rtm_table_default;
798: rib_add_ipv4_multipath (&p, rib, safi);
799: return 0;
800: }
801:
802: /* Zebra server IPv4 prefix delete function. */
803: static int
804: zread_ipv4_delete (struct zserv *client, u_short length)
805: {
806: int i;
807: struct stream *s;
808: struct zapi_ipv4 api;
809: struct in_addr nexthop, *nexthop_p;
810: unsigned long ifindex;
811: struct prefix_ipv4 p;
812: u_char nexthop_num;
813: u_char nexthop_type;
814: u_char ifname_len;
815:
816: s = client->ibuf;
817: ifindex = 0;
818: nexthop.s_addr = 0;
819: nexthop_p = NULL;
820:
821: /* Type, flags, message. */
822: api.type = stream_getc (s);
823: api.flags = stream_getc (s);
824: api.message = stream_getc (s);
825: api.safi = stream_getw (s);
826:
827: /* IPv4 prefix. */
828: memset (&p, 0, sizeof (struct prefix_ipv4));
829: p.family = AF_INET;
830: p.prefixlen = stream_getc (s);
831: stream_get (&p.prefix, s, PSIZE (p.prefixlen));
832:
833: /* Nexthop, ifindex, distance, metric. */
834: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP))
835: {
836: nexthop_num = stream_getc (s);
837:
838: for (i = 0; i < nexthop_num; i++)
839: {
840: nexthop_type = stream_getc (s);
841:
842: switch (nexthop_type)
843: {
844: case ZEBRA_NEXTHOP_IFINDEX:
845: ifindex = stream_getl (s);
846: break;
847: case ZEBRA_NEXTHOP_IFNAME:
848: ifname_len = stream_getc (s);
849: stream_forward_getp (s, ifname_len);
850: break;
851: case ZEBRA_NEXTHOP_IPV4:
852: nexthop.s_addr = stream_get_ipv4 (s);
853: nexthop_p = &nexthop;
854: break;
855: case ZEBRA_NEXTHOP_IPV6:
856: stream_forward_getp (s, IPV6_MAX_BYTELEN);
857: break;
858: }
859: }
860: }
861:
862: /* Distance. */
863: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_DISTANCE))
864: api.distance = stream_getc (s);
865: else
866: api.distance = 0;
867:
868: /* Metric. */
869: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_METRIC))
870: api.metric = stream_getl (s);
871: else
872: api.metric = 0;
873:
874: rib_delete_ipv4 (api.type, api.flags, &p, nexthop_p, ifindex,
875: client->rtm_table, api.safi);
876: return 0;
877: }
878:
879: /* Nexthop lookup for IPv4. */
880: static int
881: zread_ipv4_nexthop_lookup (struct zserv *client, u_short length)
882: {
883: struct in_addr addr;
884:
885: addr.s_addr = stream_get_ipv4 (client->ibuf);
886: return zsend_ipv4_nexthop_lookup (client, addr);
887: }
888:
889: /* Nexthop lookup for IPv4. */
890: static int
891: zread_ipv4_import_lookup (struct zserv *client, u_short length)
892: {
893: struct prefix_ipv4 p;
894:
895: p.family = AF_INET;
896: p.prefixlen = stream_getc (client->ibuf);
897: p.prefix.s_addr = stream_get_ipv4 (client->ibuf);
898:
899: return zsend_ipv4_import_lookup (client, &p);
900: }
901:
902: #ifdef HAVE_IPV6
903: /* Zebra server IPv6 prefix add function. */
904: static int
905: zread_ipv6_add (struct zserv *client, u_short length)
906: {
907: int i;
908: struct stream *s;
909: struct zapi_ipv6 api;
910: struct in6_addr nexthop;
911: unsigned long ifindex;
912: struct prefix_ipv6 p;
913:
914: s = client->ibuf;
915: ifindex = 0;
916: memset (&nexthop, 0, sizeof (struct in6_addr));
917:
918: /* Type, flags, message. */
919: api.type = stream_getc (s);
920: api.flags = stream_getc (s);
921: api.message = stream_getc (s);
922: api.safi = stream_getw (s);
923:
924: /* IPv4 prefix. */
925: memset (&p, 0, sizeof (struct prefix_ipv6));
926: p.family = AF_INET6;
927: p.prefixlen = stream_getc (s);
928: stream_get (&p.prefix, s, PSIZE (p.prefixlen));
929:
930: /* Nexthop, ifindex, distance, metric. */
931: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP))
932: {
933: u_char nexthop_type;
934:
935: api.nexthop_num = stream_getc (s);
936: for (i = 0; i < api.nexthop_num; i++)
937: {
938: nexthop_type = stream_getc (s);
939:
940: switch (nexthop_type)
941: {
942: case ZEBRA_NEXTHOP_IPV6:
943: stream_get (&nexthop, s, 16);
944: break;
945: case ZEBRA_NEXTHOP_IFINDEX:
946: ifindex = stream_getl (s);
947: break;
948: }
949: }
950: }
951:
952: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_DISTANCE))
953: api.distance = stream_getc (s);
954: else
955: api.distance = 0;
956:
957: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_METRIC))
958: api.metric = stream_getl (s);
959: else
960: api.metric = 0;
961:
962: if (IN6_IS_ADDR_UNSPECIFIED (&nexthop))
963: rib_add_ipv6 (api.type, api.flags, &p, NULL, ifindex, zebrad.rtm_table_default, api.metric,
964: api.distance, api.safi);
965: else
966: rib_add_ipv6 (api.type, api.flags, &p, &nexthop, ifindex, zebrad.rtm_table_default, api.metric,
967: api.distance, api.safi);
968: return 0;
969: }
970:
971: /* Zebra server IPv6 prefix delete function. */
972: static int
973: zread_ipv6_delete (struct zserv *client, u_short length)
974: {
975: int i;
976: struct stream *s;
977: struct zapi_ipv6 api;
978: struct in6_addr nexthop;
979: unsigned long ifindex;
980: struct prefix_ipv6 p;
981:
982: s = client->ibuf;
983: ifindex = 0;
984: memset (&nexthop, 0, sizeof (struct in6_addr));
985:
986: /* Type, flags, message. */
987: api.type = stream_getc (s);
988: api.flags = stream_getc (s);
989: api.message = stream_getc (s);
990: api.safi = stream_getw (s);
991:
992: /* IPv4 prefix. */
993: memset (&p, 0, sizeof (struct prefix_ipv6));
994: p.family = AF_INET6;
995: p.prefixlen = stream_getc (s);
996: stream_get (&p.prefix, s, PSIZE (p.prefixlen));
997:
998: /* Nexthop, ifindex, distance, metric. */
999: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP))
1000: {
1001: u_char nexthop_type;
1002:
1003: api.nexthop_num = stream_getc (s);
1004: for (i = 0; i < api.nexthop_num; i++)
1005: {
1006: nexthop_type = stream_getc (s);
1007:
1008: switch (nexthop_type)
1009: {
1010: case ZEBRA_NEXTHOP_IPV6:
1011: stream_get (&nexthop, s, 16);
1012: break;
1013: case ZEBRA_NEXTHOP_IFINDEX:
1014: ifindex = stream_getl (s);
1015: break;
1016: }
1017: }
1018: }
1019:
1020: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_DISTANCE))
1021: api.distance = stream_getc (s);
1022: else
1023: api.distance = 0;
1024: if (CHECK_FLAG (api.message, ZAPI_MESSAGE_METRIC))
1025: api.metric = stream_getl (s);
1026: else
1027: api.metric = 0;
1028:
1029: if (IN6_IS_ADDR_UNSPECIFIED (&nexthop))
1030: rib_delete_ipv6 (api.type, api.flags, &p, NULL, ifindex, client->rtm_table, api.safi);
1031: else
1032: rib_delete_ipv6 (api.type, api.flags, &p, &nexthop, ifindex, client->rtm_table, api.safi);
1033: return 0;
1034: }
1035:
1036: static int
1037: zread_ipv6_nexthop_lookup (struct zserv *client, u_short length)
1038: {
1039: struct in6_addr addr;
1040: char buf[BUFSIZ];
1041:
1042: stream_get (&addr, client->ibuf, 16);
1043: printf ("DEBUG %s\n", inet_ntop (AF_INET6, &addr, buf, BUFSIZ));
1044:
1045: return zsend_ipv6_nexthop_lookup (client, &addr);
1046: }
1047: #endif /* HAVE_IPV6 */
1048:
1049: /* Register zebra server router-id information. Send current router-id */
1050: static int
1051: zread_router_id_add (struct zserv *client, u_short length)
1052: {
1053: struct prefix p;
1054:
1055: /* Router-id information is needed. */
1056: client->ridinfo = 1;
1057:
1058: router_id_get (&p);
1059:
1060: return zsend_router_id_update (client,&p);
1061: }
1062:
1063: /* Unregister zebra server router-id information. */
1064: static int
1065: zread_router_id_delete (struct zserv *client, u_short length)
1066: {
1067: client->ridinfo = 0;
1068: return 0;
1069: }
1070:
1071: /* Tie up route-type and client->sock */
1072: static void
1073: zread_hello (struct zserv *client)
1074: {
1075: /* type of protocol (lib/zebra.h) */
1076: u_char proto;
1077: proto = stream_getc (client->ibuf);
1078:
1079: /* accept only dynamic routing protocols */
1080: if ((proto < ZEBRA_ROUTE_MAX)
1081: && (proto > ZEBRA_ROUTE_STATIC))
1082: {
1083: zlog_notice ("client %d says hello and bids fair to announce only %s routes",
1084: client->sock, zebra_route_string(proto));
1085:
1086: /* if route-type was binded by other client */
1087: if (route_type_oaths[proto])
1088: zlog_warn ("sender of %s routes changed %c->%c",
1089: zebra_route_string(proto), route_type_oaths[proto],
1090: client->sock);
1091:
1092: route_type_oaths[proto] = client->sock;
1093: }
1094: }
1095:
1096: /* If client sent routes of specific type, zebra removes it
1097: * and returns number of deleted routes.
1098: */
1099: static void
1100: zebra_score_rib (int client_sock)
1101: {
1102: int i;
1103:
1104: for (i = ZEBRA_ROUTE_RIP; i < ZEBRA_ROUTE_MAX; i++)
1105: if (client_sock == route_type_oaths[i])
1106: {
1107: zlog_notice ("client %d disconnected. %lu %s routes removed from the rib",
1108: client_sock, rib_score_proto (i), zebra_route_string (i));
1109: route_type_oaths[i] = 0;
1110: break;
1111: }
1112: }
1113:
1114: /* Close zebra client. */
1115: static void
1116: zebra_client_close (struct zserv *client)
1117: {
1118: /* Close file descriptor. */
1119: if (client->sock)
1120: {
1121: close (client->sock);
1122: zebra_score_rib (client->sock);
1123: client->sock = -1;
1124: }
1125:
1126: /* Free stream buffers. */
1127: if (client->ibuf)
1128: stream_free (client->ibuf);
1129: if (client->obuf)
1130: stream_free (client->obuf);
1131: if (client->wb)
1132: buffer_free(client->wb);
1133:
1134: /* Release threads. */
1135: if (client->t_read)
1136: thread_cancel (client->t_read);
1137: if (client->t_write)
1138: thread_cancel (client->t_write);
1139: if (client->t_suicide)
1140: thread_cancel (client->t_suicide);
1141:
1142: /* Free client structure. */
1143: listnode_delete (zebrad.client_list, client);
1144: XFREE (0, client);
1145: }
1146:
1147: /* Make new client. */
1148: static void
1149: zebra_client_create (int sock)
1150: {
1151: struct zserv *client;
1152:
1153: client = XCALLOC (0, sizeof (struct zserv));
1154:
1155: /* Make client input/output buffer. */
1156: client->sock = sock;
1157: client->ibuf = stream_new (ZEBRA_MAX_PACKET_SIZ);
1158: client->obuf = stream_new (ZEBRA_MAX_PACKET_SIZ);
1159: client->wb = buffer_new(0);
1160:
1161: /* Set table number. */
1162: client->rtm_table = zebrad.rtm_table_default;
1163:
1164: /* Add this client to linked list. */
1165: listnode_add (zebrad.client_list, client);
1166:
1167: /* Make new read thread. */
1168: zebra_event (ZEBRA_READ, sock, client);
1169: }
1170:
1171: /* Handler of zebra service request. */
1172: static int
1173: zebra_client_read (struct thread *thread)
1174: {
1175: int sock;
1176: struct zserv *client;
1177: size_t already;
1178: uint16_t length, command;
1179: uint8_t marker, version;
1180:
1181: /* Get thread data. Reset reading thread because I'm running. */
1182: sock = THREAD_FD (thread);
1183: client = THREAD_ARG (thread);
1184: client->t_read = NULL;
1185:
1186: if (client->t_suicide)
1187: {
1188: zebra_client_close(client);
1189: return -1;
1190: }
1191:
1192: /* Read length and command (if we don't have it already). */
1193: if ((already = stream_get_endp(client->ibuf)) < ZEBRA_HEADER_SIZE)
1194: {
1195: ssize_t nbyte;
1196: if (((nbyte = stream_read_try (client->ibuf, sock,
1197: ZEBRA_HEADER_SIZE-already)) == 0) ||
1198: (nbyte == -1))
1199: {
1200: if (IS_ZEBRA_DEBUG_EVENT)
1201: zlog_debug ("connection closed socket [%d]", sock);
1202: zebra_client_close (client);
1203: return -1;
1204: }
1205: if (nbyte != (ssize_t)(ZEBRA_HEADER_SIZE-already))
1206: {
1207: /* Try again later. */
1208: zebra_event (ZEBRA_READ, sock, client);
1209: return 0;
1210: }
1211: already = ZEBRA_HEADER_SIZE;
1212: }
1213:
1214: /* Reset to read from the beginning of the incoming packet. */
1215: stream_set_getp(client->ibuf, 0);
1216:
1217: /* Fetch header values */
1218: length = stream_getw (client->ibuf);
1219: marker = stream_getc (client->ibuf);
1220: version = stream_getc (client->ibuf);
1221: command = stream_getw (client->ibuf);
1222:
1223: if (marker != ZEBRA_HEADER_MARKER || version != ZSERV_VERSION)
1224: {
1225: zlog_err("%s: socket %d version mismatch, marker %d, version %d",
1226: __func__, sock, marker, version);
1227: zebra_client_close (client);
1228: return -1;
1229: }
1230: if (length < ZEBRA_HEADER_SIZE)
1231: {
1232: zlog_warn("%s: socket %d message length %u is less than header size %d",
1233: __func__, sock, length, ZEBRA_HEADER_SIZE);
1234: zebra_client_close (client);
1235: return -1;
1236: }
1237: if (length > STREAM_SIZE(client->ibuf))
1238: {
1239: zlog_warn("%s: socket %d message length %u exceeds buffer size %lu",
1240: __func__, sock, length, (u_long)STREAM_SIZE(client->ibuf));
1241: zebra_client_close (client);
1242: return -1;
1243: }
1244:
1245: /* Read rest of data. */
1246: if (already < length)
1247: {
1248: ssize_t nbyte;
1249: if (((nbyte = stream_read_try (client->ibuf, sock,
1250: length-already)) == 0) ||
1251: (nbyte == -1))
1252: {
1253: if (IS_ZEBRA_DEBUG_EVENT)
1254: zlog_debug ("connection closed [%d] when reading zebra data", sock);
1255: zebra_client_close (client);
1256: return -1;
1257: }
1258: if (nbyte != (ssize_t)(length-already))
1259: {
1260: /* Try again later. */
1261: zebra_event (ZEBRA_READ, sock, client);
1262: return 0;
1263: }
1264: }
1265:
1266: length -= ZEBRA_HEADER_SIZE;
1267:
1268: /* Debug packet information. */
1269: if (IS_ZEBRA_DEBUG_EVENT)
1270: zlog_debug ("zebra message comes from socket [%d]", sock);
1271:
1272: if (IS_ZEBRA_DEBUG_PACKET && IS_ZEBRA_DEBUG_RECV)
1273: zlog_debug ("zebra message received [%s] %d",
1274: zserv_command_string (command), length);
1275:
1276: switch (command)
1277: {
1278: case ZEBRA_ROUTER_ID_ADD:
1279: zread_router_id_add (client, length);
1280: break;
1281: case ZEBRA_ROUTER_ID_DELETE:
1282: zread_router_id_delete (client, length);
1283: break;
1284: case ZEBRA_INTERFACE_ADD:
1285: zread_interface_add (client, length);
1286: break;
1287: case ZEBRA_INTERFACE_DELETE:
1288: zread_interface_delete (client, length);
1289: break;
1290: case ZEBRA_IPV4_ROUTE_ADD:
1291: zread_ipv4_add (client, length);
1292: break;
1293: case ZEBRA_IPV4_ROUTE_DELETE:
1294: zread_ipv4_delete (client, length);
1295: break;
1296: #ifdef HAVE_IPV6
1297: case ZEBRA_IPV6_ROUTE_ADD:
1298: zread_ipv6_add (client, length);
1299: break;
1300: case ZEBRA_IPV6_ROUTE_DELETE:
1301: zread_ipv6_delete (client, length);
1302: break;
1303: #endif /* HAVE_IPV6 */
1304: case ZEBRA_REDISTRIBUTE_ADD:
1305: zebra_redistribute_add (command, client, length);
1306: break;
1307: case ZEBRA_REDISTRIBUTE_DELETE:
1308: zebra_redistribute_delete (command, client, length);
1309: break;
1310: case ZEBRA_REDISTRIBUTE_DEFAULT_ADD:
1311: zebra_redistribute_default_add (command, client, length);
1312: break;
1313: case ZEBRA_REDISTRIBUTE_DEFAULT_DELETE:
1314: zebra_redistribute_default_delete (command, client, length);
1315: break;
1316: case ZEBRA_IPV4_NEXTHOP_LOOKUP:
1317: zread_ipv4_nexthop_lookup (client, length);
1318: break;
1319: #ifdef HAVE_IPV6
1320: case ZEBRA_IPV6_NEXTHOP_LOOKUP:
1321: zread_ipv6_nexthop_lookup (client, length);
1322: break;
1323: #endif /* HAVE_IPV6 */
1324: case ZEBRA_IPV4_IMPORT_LOOKUP:
1325: zread_ipv4_import_lookup (client, length);
1326: break;
1327: case ZEBRA_HELLO:
1328: zread_hello (client);
1329: break;
1330: default:
1331: zlog_info ("Zebra received unknown command %d", command);
1332: break;
1333: }
1334:
1335: if (client->t_suicide)
1336: {
1337: /* No need to wait for thread callback, just kill immediately. */
1338: zebra_client_close(client);
1339: return -1;
1340: }
1341:
1342: stream_reset (client->ibuf);
1343: zebra_event (ZEBRA_READ, sock, client);
1344: return 0;
1345: }
1346:
1347:
1348: /* Accept code of zebra server socket. */
1349: static int
1350: zebra_accept (struct thread *thread)
1351: {
1352: int accept_sock;
1353: int client_sock;
1354: struct sockaddr_in client;
1355: socklen_t len;
1356:
1357: accept_sock = THREAD_FD (thread);
1358:
1359: /* Reregister myself. */
1360: zebra_event (ZEBRA_SERV, accept_sock, NULL);
1361:
1362: len = sizeof (struct sockaddr_in);
1363: client_sock = accept (accept_sock, (struct sockaddr *) &client, &len);
1364:
1365: if (client_sock < 0)
1366: {
1367: zlog_warn ("Can't accept zebra socket: %s", safe_strerror (errno));
1368: return -1;
1369: }
1370:
1371: /* Make client socket non-blocking. */
1372: set_nonblocking(client_sock);
1373:
1374: /* Create new zebra client. */
1375: zebra_client_create (client_sock);
1376:
1377: return 0;
1378: }
1379:
1380: #ifdef HAVE_TCP_ZEBRA
1381: /* Make zebra's server socket. */
1382: static void
1383: zebra_serv ()
1384: {
1385: int ret;
1386: int accept_sock;
1387: struct sockaddr_in addr;
1388:
1389: accept_sock = socket (AF_INET, SOCK_STREAM, 0);
1390:
1391: if (accept_sock < 0)
1392: {
1393: zlog_warn ("Can't create zserv stream socket: %s",
1394: safe_strerror (errno));
1395: zlog_warn ("zebra can't provice full functionality due to above error");
1396: return;
1397: }
1398:
1399: memset (&route_type_oaths, 0, sizeof (route_type_oaths));
1400: memset (&addr, 0, sizeof (struct sockaddr_in));
1401: addr.sin_family = AF_INET;
1402: addr.sin_port = htons (ZEBRA_PORT);
1403: #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
1404: addr.sin_len = sizeof (struct sockaddr_in);
1405: #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
1406: addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
1407:
1408: sockopt_reuseaddr (accept_sock);
1409: sockopt_reuseport (accept_sock);
1410:
1411: if ( zserv_privs.change(ZPRIVS_RAISE) )
1412: zlog (NULL, LOG_ERR, "Can't raise privileges");
1413:
1414: ret = bind (accept_sock, (struct sockaddr *)&addr,
1415: sizeof (struct sockaddr_in));
1416: if (ret < 0)
1417: {
1418: zlog_warn ("Can't bind to stream socket: %s",
1419: safe_strerror (errno));
1420: zlog_warn ("zebra can't provice full functionality due to above error");
1421: close (accept_sock); /* Avoid sd leak. */
1422: return;
1423: }
1424:
1425: if ( zserv_privs.change(ZPRIVS_LOWER) )
1426: zlog (NULL, LOG_ERR, "Can't lower privileges");
1427:
1428: ret = listen (accept_sock, 1);
1429: if (ret < 0)
1430: {
1431: zlog_warn ("Can't listen to stream socket: %s",
1432: safe_strerror (errno));
1433: zlog_warn ("zebra can't provice full functionality due to above error");
1434: close (accept_sock); /* Avoid sd leak. */
1435: return;
1436: }
1437:
1438: zebra_event (ZEBRA_SERV, accept_sock, NULL);
1439: }
1440: #endif /* HAVE_TCP_ZEBRA */
1441:
1442: /* For sockaddr_un. */
1443: #include <sys/un.h>
1444:
1445: /* zebra server UNIX domain socket. */
1446: static void
1447: zebra_serv_un (const char *path)
1448: {
1449: int ret;
1450: int sock, len;
1451: struct sockaddr_un serv;
1452: mode_t old_mask;
1453:
1454: /* First of all, unlink existing socket */
1455: unlink (path);
1456:
1457: /* Set umask */
1458: old_mask = umask (0077);
1459:
1460: /* Make UNIX domain socket. */
1461: sock = socket (AF_UNIX, SOCK_STREAM, 0);
1462: if (sock < 0)
1463: {
1464: zlog_warn ("Can't create zserv unix socket: %s",
1465: safe_strerror (errno));
1466: zlog_warn ("zebra can't provide full functionality due to above error");
1467: return;
1468: }
1469:
1470: memset (&route_type_oaths, 0, sizeof (route_type_oaths));
1471:
1472: /* Make server socket. */
1473: memset (&serv, 0, sizeof (struct sockaddr_un));
1474: serv.sun_family = AF_UNIX;
1475: strncpy (serv.sun_path, path, strlen (path));
1476: #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
1477: len = serv.sun_len = SUN_LEN(&serv);
1478: #else
1479: len = sizeof (serv.sun_family) + strlen (serv.sun_path);
1480: #endif /* HAVE_STRUCT_SOCKADDR_UN_SUN_LEN */
1481:
1482: ret = bind (sock, (struct sockaddr *) &serv, len);
1483: if (ret < 0)
1484: {
1485: zlog_warn ("Can't bind to unix socket %s: %s",
1486: path, safe_strerror (errno));
1487: zlog_warn ("zebra can't provide full functionality due to above error");
1488: close (sock);
1489: return;
1490: }
1491:
1492: ret = listen (sock, 5);
1493: if (ret < 0)
1494: {
1495: zlog_warn ("Can't listen to unix socket %s: %s",
1496: path, safe_strerror (errno));
1497: zlog_warn ("zebra can't provide full functionality due to above error");
1498: close (sock);
1499: return;
1500: }
1501:
1502: umask (old_mask);
1503:
1504: zebra_event (ZEBRA_SERV, sock, NULL);
1505: }
1506:
1507:
1508: static void
1509: zebra_event (enum event event, int sock, struct zserv *client)
1510: {
1511: switch (event)
1512: {
1513: case ZEBRA_SERV:
1514: thread_add_read (zebrad.master, zebra_accept, client, sock);
1515: break;
1516: case ZEBRA_READ:
1517: client->t_read =
1518: thread_add_read (zebrad.master, zebra_client_read, client, sock);
1519: break;
1520: case ZEBRA_WRITE:
1521: /**/
1522: break;
1523: }
1524: }
1525:
1526: /* Display default rtm_table for all clients. */
1527: DEFUN (show_table,
1528: show_table_cmd,
1529: "show table",
1530: SHOW_STR
1531: "default routing table to use for all clients\n")
1532: {
1533: vty_out (vty, "table %d%s", zebrad.rtm_table_default,
1534: VTY_NEWLINE);
1535: return CMD_SUCCESS;
1536: }
1537:
1538: DEFUN (config_table,
1539: config_table_cmd,
1540: "table TABLENO",
1541: "Configure target kernel routing table\n"
1542: "TABLE integer\n")
1543: {
1544: zebrad.rtm_table_default = strtol (argv[0], (char**)0, 10);
1545: return CMD_SUCCESS;
1546: }
1547:
1548: DEFUN (ip_forwarding,
1549: ip_forwarding_cmd,
1550: "ip forwarding",
1551: IP_STR
1552: "Turn on IP forwarding")
1553: {
1554: int ret;
1555:
1556: ret = ipforward ();
1557: if (ret == 0)
1558: ret = ipforward_on ();
1559:
1560: if (ret == 0)
1561: {
1562: vty_out (vty, "Can't turn on IP forwarding%s", VTY_NEWLINE);
1563: return CMD_WARNING;
1564: }
1565:
1566: return CMD_SUCCESS;
1567: }
1568:
1569: DEFUN (no_ip_forwarding,
1570: no_ip_forwarding_cmd,
1571: "no ip forwarding",
1572: NO_STR
1573: IP_STR
1574: "Turn off IP forwarding")
1575: {
1576: int ret;
1577:
1578: ret = ipforward ();
1579: if (ret != 0)
1580: ret = ipforward_off ();
1581:
1582: if (ret != 0)
1583: {
1584: vty_out (vty, "Can't turn off IP forwarding%s", VTY_NEWLINE);
1585: return CMD_WARNING;
1586: }
1587:
1588: return CMD_SUCCESS;
1589: }
1590:
1591: /* This command is for debugging purpose. */
1592: DEFUN (show_zebra_client,
1593: show_zebra_client_cmd,
1594: "show zebra client",
1595: SHOW_STR
1596: "Zebra information"
1597: "Client information")
1598: {
1599: struct listnode *node;
1600: struct zserv *client;
1601:
1602: for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
1603: vty_out (vty, "Client fd %d%s", client->sock, VTY_NEWLINE);
1604:
1605: return CMD_SUCCESS;
1606: }
1607:
1608: /* Table configuration write function. */
1609: static int
1610: config_write_table (struct vty *vty)
1611: {
1612: if (zebrad.rtm_table_default)
1613: vty_out (vty, "table %d%s", zebrad.rtm_table_default,
1614: VTY_NEWLINE);
1615: return 0;
1616: }
1617:
1618: /* table node for routing tables. */
1619: static struct cmd_node table_node =
1620: {
1621: TABLE_NODE,
1622: "", /* This node has no interface. */
1623: 1
1624: };
1625:
1626: /* Only display ip forwarding is enabled or not. */
1627: DEFUN (show_ip_forwarding,
1628: show_ip_forwarding_cmd,
1629: "show ip forwarding",
1630: SHOW_STR
1631: IP_STR
1632: "IP forwarding status\n")
1633: {
1634: int ret;
1635:
1636: ret = ipforward ();
1637:
1638: if (ret == 0)
1639: vty_out (vty, "IP forwarding is off%s", VTY_NEWLINE);
1640: else
1641: vty_out (vty, "IP forwarding is on%s", VTY_NEWLINE);
1642: return CMD_SUCCESS;
1643: }
1644:
1645: #ifdef HAVE_IPV6
1646: /* Only display ipv6 forwarding is enabled or not. */
1647: DEFUN (show_ipv6_forwarding,
1648: show_ipv6_forwarding_cmd,
1649: "show ipv6 forwarding",
1650: SHOW_STR
1651: "IPv6 information\n"
1652: "Forwarding status\n")
1653: {
1654: int ret;
1655:
1656: ret = ipforward_ipv6 ();
1657:
1658: switch (ret)
1659: {
1660: case -1:
1661: vty_out (vty, "ipv6 forwarding is unknown%s", VTY_NEWLINE);
1662: break;
1663: case 0:
1664: vty_out (vty, "ipv6 forwarding is %s%s", "off", VTY_NEWLINE);
1665: break;
1666: case 1:
1667: vty_out (vty, "ipv6 forwarding is %s%s", "on", VTY_NEWLINE);
1668: break;
1669: default:
1670: vty_out (vty, "ipv6 forwarding is %s%s", "off", VTY_NEWLINE);
1671: break;
1672: }
1673: return CMD_SUCCESS;
1674: }
1675:
1676: DEFUN (ipv6_forwarding,
1677: ipv6_forwarding_cmd,
1678: "ipv6 forwarding",
1679: IPV6_STR
1680: "Turn on IPv6 forwarding")
1681: {
1682: int ret;
1683:
1684: ret = ipforward_ipv6 ();
1685: if (ret == 0)
1686: ret = ipforward_ipv6_on ();
1687:
1688: if (ret == 0)
1689: {
1690: vty_out (vty, "Can't turn on IPv6 forwarding%s", VTY_NEWLINE);
1691: return CMD_WARNING;
1692: }
1693:
1694: return CMD_SUCCESS;
1695: }
1696:
1697: DEFUN (no_ipv6_forwarding,
1698: no_ipv6_forwarding_cmd,
1699: "no ipv6 forwarding",
1700: NO_STR
1701: IPV6_STR
1702: "Turn off IPv6 forwarding")
1703: {
1704: int ret;
1705:
1706: ret = ipforward_ipv6 ();
1707: if (ret != 0)
1708: ret = ipforward_ipv6_off ();
1709:
1710: if (ret != 0)
1711: {
1712: vty_out (vty, "Can't turn off IPv6 forwarding%s", VTY_NEWLINE);
1713: return CMD_WARNING;
1714: }
1715:
1716: return CMD_SUCCESS;
1717: }
1718:
1719: #endif /* HAVE_IPV6 */
1720:
1721: /* IPForwarding configuration write function. */
1722: static int
1723: config_write_forwarding (struct vty *vty)
1724: {
1725: /* FIXME: Find better place for that. */
1726: router_id_write (vty);
1727:
1728: if (ipforward ())
1729: vty_out (vty, "ip forwarding%s", VTY_NEWLINE);
1730: #ifdef HAVE_IPV6
1731: if (ipforward_ipv6 ())
1732: vty_out (vty, "ipv6 forwarding%s", VTY_NEWLINE);
1733: #endif /* HAVE_IPV6 */
1734: vty_out (vty, "!%s", VTY_NEWLINE);
1735: return 0;
1736: }
1737:
1738: /* table node for routing tables. */
1739: static struct cmd_node forwarding_node =
1740: {
1741: FORWARDING_NODE,
1742: "", /* This node has no interface. */
1743: 1
1744: };
1745:
1746:
1747: /* Initialisation of zebra and installation of commands. */
1748: void
1749: zebra_init (void)
1750: {
1751: /* Client list init. */
1752: zebrad.client_list = list_new ();
1753:
1754: /* Install configuration write function. */
1755: install_node (&table_node, config_write_table);
1756: install_node (&forwarding_node, config_write_forwarding);
1757:
1758: install_element (VIEW_NODE, &show_ip_forwarding_cmd);
1759: install_element (ENABLE_NODE, &show_ip_forwarding_cmd);
1760: install_element (CONFIG_NODE, &ip_forwarding_cmd);
1761: install_element (CONFIG_NODE, &no_ip_forwarding_cmd);
1762: install_element (ENABLE_NODE, &show_zebra_client_cmd);
1763:
1764: #ifdef HAVE_NETLINK
1765: install_element (VIEW_NODE, &show_table_cmd);
1766: install_element (ENABLE_NODE, &show_table_cmd);
1767: install_element (CONFIG_NODE, &config_table_cmd);
1768: #endif /* HAVE_NETLINK */
1769:
1770: #ifdef HAVE_IPV6
1771: install_element (VIEW_NODE, &show_ipv6_forwarding_cmd);
1772: install_element (ENABLE_NODE, &show_ipv6_forwarding_cmd);
1773: install_element (CONFIG_NODE, &ipv6_forwarding_cmd);
1774: install_element (CONFIG_NODE, &no_ipv6_forwarding_cmd);
1775: #endif /* HAVE_IPV6 */
1776:
1777: /* Route-map */
1778: zebra_route_map_init ();
1779: }
1780:
1781: /* Make zebra server socket, wiping any existing one (see bug #403). */
1782: void
1783: zebra_zserv_socket_init (char *path)
1784: {
1785: #ifdef HAVE_TCP_ZEBRA
1786: zebra_serv ();
1787: #else
1788: zebra_serv_un (path ? path : ZEBRA_SERV_PATH);
1789: #endif /* HAVE_TCP_ZEBRA */
1790: }
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