bridge_snmp.c revision 164997 
1140195Sdas/*-
2140195Sdas * Copyright (c) 2006 Shteryana Shopova <syrinx@FreeBSD.org>
3140195Sdas * All rights reserved.
4140195Sdas *
5140195Sdas * Redistribution and use in source and binary forms, with or without
6140195Sdas * modification, are permitted provided that the following conditions
7140195Sdas * are met:
8140195Sdas * 1. Redistributions of source code must retain the above copyright
9140195Sdas *    notice, this list of conditions and the following disclaimer.
10140195Sdas * 2. Redistributions in binary form must reproduce the above copyright
11140195Sdas *    notice, this list of conditions and the following disclaimer in the
12140195Sdas *    documentation and/or other materials provided with the distribution.
13140195Sdas *
14140195Sdas * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15140195Sdas * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16145969Sdeischen * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17145969Sdeischen * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18140195Sdas * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19140195Sdas * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20145969Sdeischen * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21145969Sdeischen * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22140195Sdas * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23140195Sdas * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24140195Sdas * SUCH DAMAGE.
25140195Sdas *
26145969Sdeischen * Bridge MIB implementation for SNMPd.
27140195Sdas *
28140195Sdas * $FreeBSD: head/usr.sbin/bsnmpd/modules/snmp_bridge/bridge_snmp.c 164997 2006-12-07 22:36:17Z syrinx $
29140195Sdas */
30
31#include <sys/param.h>
32#include <sys/queue.h>
33#include <sys/socket.h>
34#include <sys/types.h>
35
36#include <net/ethernet.h>
37#include <net/if.h>
38#include <net/if_mib.h>
39#include <net/if_types.h>
40
41#include <errno.h>
42#include <stdarg.h>
43#include <stdlib.h>
44#include <stdio.h>
45#include <string.h>
46#include <syslog.h>
47
48#include <bsnmp/snmpmod.h>
49#include <bsnmp/snmp_mibII.h>
50
51#include "bridge_tree.h"
52#include "bridge_snmp.h"
53#include "bridge_oid.h"
54
55static struct lmodule *bridge_module;
56
57/* For the registration. */
58static const struct asn_oid oid_dot1Bridge = OIDX_dot1dBridge;
59/* The registration. */
60static uint reg_bridge;
61
62/* Periodic timer for polling all bridges' data. */
63static void *bridge_data_timer;
64static void *bridge_tc_timer;
65
66static int bridge_data_maxage = SNMP_BRIDGE_DATA_MAXAGE;
67static int bridge_poll_ticks = SNMP_BRIDGE_POLL_INTERVAL * 100;
68static int bridge_tc_poll_ticks = SNMP_BRIDGE_TC_POLL_INTERVAL * 100;
69
70/*
71 * Our default bridge, whose info will be visible under
72 * the dot1dBridge subtree and functions to set/fetch it.
73 */
74static char bif_default_name[IFNAMSIZ] = "bridge0";
75static struct bridge_if *bif_default;
76
77struct bridge_if *
78bridge_get_default(void)
79{
80	struct mibif *ifp;
81
82	if (bif_default != NULL) {
83
84		/* Walk through the mibII interface list. */
85		for (ifp = mib_first_if(); ifp != NULL; ifp = mib_next_if(ifp))
86			if (strcmp(ifp->name, bif_default->bif_name) == 0)
87				break;
88
89		if (ifp == NULL)
90			bif_default = NULL;
91	}
92
93	return (bif_default);
94}
95
96void
97bridge_set_default(struct bridge_if *bif)
98{
99	bif_default = bif;
100
101	syslog(LOG_ERR, "Set default bridge interface to: %s",
102	    bif == NULL ? "(none)" : bif->bif_name);
103}
104
105const char *
106bridge_get_default_name(void)
107{
108	return (bif_default_name);
109}
110
111static int
112bridge_set_default_name(const char *bif_name, uint len)
113{
114	struct bridge_if *bif;
115
116	if (len >= IFNAMSIZ)
117		return (-1);
118
119	bcopy(bif_name, bif_default_name, len);
120	bif_default_name[len] = '\0';
121
122	if ((bif = bridge_if_find_ifname(bif_default_name)) == NULL) {
123		bif_default = NULL;
124		return (0);
125	}
126
127	bif_default = bif;
128	return (1);
129}
130
131int
132bridge_get_data_maxage(void)
133{
134	return (bridge_data_maxage);
135}
136
137static void
138bridge_set_poll_ticks(int poll_ticks)
139{
140	if (bridge_data_timer != NULL)
141		timer_stop(bridge_data_timer);
142
143	bridge_poll_ticks = poll_ticks;
144	bridge_data_timer = timer_start_repeat(bridge_poll_ticks,
145	    bridge_poll_ticks, bridge_update_all, NULL, bridge_module);
146}
147/*
148 * The bridge module configuration via SNMP.
149 */
150static int
151bridge_default_name_save(struct snmp_context *ctx, const char *bridge_default)
152{
153	if ((ctx->scratch->int1 = strlen(bridge_default)) >= IFNAMSIZ)
154		return (-1);
155
156	if ((ctx->scratch->ptr1 = malloc(IFNAMSIZ)) == NULL)
157		return (-1);
158
159	strncpy(ctx->scratch->ptr1, bridge_default, ctx->scratch->int1);
160	return (0);
161}
162
163int
164op_begemot_bridge_config(struct snmp_context *ctx, struct snmp_value *val,
165    uint sub, uint iidx __unused, enum snmp_op op)
166{
167	switch (op) {
168	    case SNMP_OP_GET:
169		switch (val->var.subs[sub - 1]) {
170		    case LEAF_begemotBridgeDefaultBridgeIf:
171			string_get(val, bridge_get_default_name(), -1);
172			break;
173		    case LEAF_begemotBridgeDataUpdate:
174			val->v.integer = bridge_data_maxage;
175			break;
176		    case LEAF_begemotBridgeDataPoll:
177			val->v.integer = bridge_poll_ticks / 100;
178			break;
179		}
180		return (SNMP_ERR_NOERROR);
181
182	    case SNMP_OP_GETNEXT:
183		abort();
184
185	    case SNMP_OP_SET:
186		switch (val->var.subs[sub - 1]) {
187		    case LEAF_begemotBridgeDefaultBridgeIf:
188			/*
189			 * Cannot use string_save() here - requires either
190			 * a fixed-sized or var-length string - not less
191			 * than or equal.
192			 */
193			if (bridge_default_name_save(ctx,
194			    bridge_get_default_name()) < 0)
195				return (SNMP_ERR_RES_UNAVAIL);
196
197			if (bridge_set_default_name(val->v.octetstring.octets,
198			    val->v.octetstring.len) < 0)
199				return (SNMP_ERR_BADVALUE);
200			break;
201		    case LEAF_begemotBridgeDataUpdate:
202			if (val->v.integer < SNMP_BRIDGE_DATA_MAXAGE_MIN ||
203			    val->v.integer > SNMP_BRIDGE_DATA_MAXAGE_MAX)
204				return (SNMP_ERR_WRONG_VALUE);
205			ctx->scratch->int1 = bridge_data_maxage;
206			bridge_data_maxage = val->v.integer;
207			break;
208		    case LEAF_begemotBridgeDataPoll:
209			if (val->v.integer < SNMP_BRIDGE_POLL_INTERVAL_MIN ||
210			    val->v.integer > SNMP_BRIDGE_POLL_INTERVAL_MAX)
211				return (SNMP_ERR_WRONG_VALUE);
212			ctx->scratch->int1 = val->v.integer;
213			break;
214		}
215		return (SNMP_ERR_NOERROR);
216
217	    case SNMP_OP_ROLLBACK:
218		switch (val->var.subs[sub - 1]) {
219		    case LEAF_begemotBridgeDefaultBridgeIf:
220			bridge_set_default_name(ctx->scratch->ptr1,
221			    ctx->scratch->int1);
222			free(ctx->scratch->ptr1);
223			break;
224		    case LEAF_begemotBridgeDataUpdate:
225			bridge_data_maxage = ctx->scratch->int1;
226			break;
227		}
228		return (SNMP_ERR_NOERROR);
229
230	    case SNMP_OP_COMMIT:
231		switch (val->var.subs[sub - 1]) {
232		    case LEAF_begemotBridgeDefaultBridgeIf:
233			free(ctx->scratch->ptr1);
234			break;
235		    case LEAF_begemotBridgeDataPoll:
236			bridge_set_poll_ticks(ctx->scratch->int1 * 100);
237			break;
238		}
239		return (SNMP_ERR_NOERROR);
240	}
241
242	return (SNMP_ERR_NOERROR);
243}
244
245/*
246 * Bridge mib module initialization hook.
247 * Returns 0 on success, < 0 on error.
248 */
249static int
250bridge_init(struct lmodule * mod, int argc __unused, char *argv[] __unused)
251{
252	bridge_module = mod;
253
254	if (bridge_kmod_load() < 0)
255		return (-1);
256
257	if (bridge_ioctl_init() < 0)
258		return (-1);
259
260	/* Register to get creation messages for bridge interfaces. */
261	if (mib_register_newif(bridge_attach_newif, bridge_module)) {
262		syslog(LOG_ERR, "Cannot register newif function: %s",
263		    strerror(errno));
264		return (-1);
265	}
266
267	return (0);
268}
269
270/*
271 * Bridge mib module finalization hook.
272 */
273static int
274bridge_fini(void)
275{
276	mib_unregister_newif(bridge_module);
277	or_unregister(reg_bridge);
278
279	if (bridge_data_timer != NULL) {
280		timer_stop(bridge_data_timer);
281		bridge_data_timer = NULL;
282	}
283
284	if (bridge_tc_timer != NULL) {
285		timer_stop(bridge_tc_timer);
286		bridge_tc_timer = NULL;
287	}
288
289	bridge_ifs_fini();
290	bridge_ports_fini();
291	bridge_addrs_fini();
292
293	return (0);
294}
295
296/*
297 * Bridge mib module start operation.
298 */
299static void
300bridge_start(void)
301{
302	reg_bridge = or_register(&oid_dot1Bridge,
303	    "The IETF MIB for Bridges (RFC 4188).", bridge_module);
304
305	bridge_data_timer = timer_start_repeat(bridge_poll_ticks,
306	    bridge_poll_ticks, bridge_update_all, NULL, bridge_module);
307
308	bridge_tc_timer = timer_start_repeat(bridge_tc_poll_ticks,
309	    bridge_tc_poll_ticks, bridge_update_tc_time, NULL, bridge_module);
310}
311
312static void
313bridge_dump(void)
314{
315	struct bridge_if *bif;
316
317	if ((bif = bridge_get_default()) == NULL)
318		syslog(LOG_ERR, "Dump: no default bridge interface");
319	else
320		syslog(LOG_ERR, "Dump: default bridge interface %s",
321		     bif->bif_name);
322
323	bridge_ifs_dump();
324	bridge_pf_dump();
325}
326
327const struct snmp_module config = {
328	.comment = "This module implements the bridge mib (RFC 4188).",
329	.init =		bridge_init,
330	.fini =		bridge_fini,
331	.start =	bridge_start,
332	.tree =		bridge_ctree,
333	.dump =		bridge_dump,
334	.tree_size =	bridge_CTREE_SIZE,
335};
336