1 /*
2 * Copyright (c) 2001-2002
3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus).
4 * All rights reserved.
5 *
6 * Author: Harti Brandt <harti@freebsd.org>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $Begemot: bsnmp/snmp_mibII/mibII_ipaddr.c,v 1.10 2005/10/04 11:21:35 brandt_h Exp $
30 *
31 * IP address table. This table is writeable!
32 *
33 * Writing to this table will add a new IP address to the interface.
34 * An address can be deleted with writing the interface index 0.
35 */
36 #include "mibII.h"
37 #include "mibII_oid.h"
38
39 static const struct asn_oid
40 oid_ipAddrTable = OIDX_ipAddrTable;
41
42 /*
43 * Be careful not to hold any pointers during the SET processing - the
44 * interface and address lists can be relocated at any time.
45 */
46 struct update {
47 struct snmp_dependency dep;
48
49 uint32_t set;
50 struct in_addr addr;
51 struct in_addr mask;
52 int bcast;
53 u_int ifindex;
54
55 uint32_t rb;
56 struct in_addr rb_mask;
57 struct in_addr rb_bcast;
58 };
59 #define UPD_IFINDEX 0x0001
60 #define UPD_MASK 0x0002
61 #define UPD_BCAST 0x0004
62 #define RB_CREATE 0x0001
63 #define RB_DESTROY 0x0002
64 #define RB_MODIFY 0x0004
65
66 /*
67 * Create a new interface address
68 */
69 static int
create(struct update * upd)70 create(struct update *upd)
71 {
72 struct in_addr bcast;
73 struct mibifa *ifa;
74
75 if (!(upd->set & UPD_MASK)) {
76 if (IN_CLASSA(ntohl(upd->addr.s_addr)))
77 upd->mask.s_addr = htonl(IN_CLASSA_NET);
78 else if (IN_CLASSB(ntohl(upd->addr.s_addr)))
79 upd->mask.s_addr = htonl(IN_CLASSB_NET);
80 else if (IN_CLASSC(ntohl(upd->addr.s_addr)))
81 upd->mask.s_addr = htonl(IN_CLASSC_NET);
82 else
83 upd->mask.s_addr = 0xffffffff;
84 }
85
86 bcast.s_addr = upd->addr.s_addr & upd->mask.s_addr;
87 if (!(upd->set & UPD_BCAST) || upd->bcast) {
88 uint32_t tmp = ~ntohl(upd->mask.s_addr);
89 bcast.s_addr |= htonl(0xffffffff & ~tmp);
90 }
91
92 if ((ifa = mib_create_ifa(upd->ifindex, upd->addr, upd->mask, bcast))
93 == NULL)
94 return (SNMP_ERR_GENERR);
95
96 upd->rb |= RB_CREATE;
97 return (SNMP_ERR_NOERROR);
98 }
99
100 /*
101 * Modify the netmask or broadcast address. The ifindex cannot be
102 * changed (obviously).
103 */
104 static int
modify(struct update * upd,struct mibifa * ifa)105 modify(struct update *upd, struct mibifa *ifa)
106 {
107 struct mibif *ifp;
108
109 if ((ifp = mib_find_if(ifa->ifindex)) == NULL)
110 return (SNMP_ERR_WRONG_VALUE);
111 if ((upd->set & UPD_IFINDEX) && upd->ifindex != ifa->ifindex)
112 return (SNMP_ERR_INCONS_VALUE);
113
114 upd->rb_mask = ifa->inmask;
115 upd->rb_bcast = ifa->inbcast;
116 if (((upd->set & UPD_MASK) && upd->mask.s_addr != ifa->inmask.s_addr) ||
117 (upd->set & UPD_BCAST)) {
118 if (upd->set & UPD_MASK)
119 ifa->inmask = upd->mask;
120 if (upd->set & UPD_BCAST) {
121 ifa->inbcast.s_addr = ifa->inaddr.s_addr
122 & ifa->inmask.s_addr;
123 if (upd->bcast)
124 ifa->inbcast.s_addr |= 0xffffffff
125 & ~ifa->inmask.s_addr;
126 }
127 if (mib_modify_ifa(ifa)) {
128 syslog(LOG_ERR, "set netmask/bcast: %m");
129 ifa->inmask = upd->rb_mask;
130 ifa->inbcast = upd->rb_bcast;
131 mib_unmodify_ifa(ifa);
132 return (SNMP_ERR_GENERR);
133 }
134 upd->rb |= RB_MODIFY;
135 }
136 return (SNMP_ERR_NOERROR);
137 }
138
139 /*
140 * Destroy the given row in the table. We remove the address from the
141 * system, but keep the structure around for the COMMIT. It's deleted
142 * only in the FINISH operation.
143 */
144 static int
destroy(struct snmp_context * ctx __unused,struct update * upd,struct mibifa * ifa)145 destroy(struct snmp_context *ctx __unused, struct update *upd,
146 struct mibifa *ifa)
147 {
148 if (mib_destroy_ifa(ifa))
149 return (SNMP_ERR_GENERR);
150 upd->rb |= RB_DESTROY;
151 return (SNMP_ERR_NOERROR);
152 }
153
154 /*
155 * This function is called to commit/rollback a SET on an IpAddrEntry
156 */
157 static int
update_func(struct snmp_context * ctx,struct snmp_dependency * dep,enum snmp_depop op)158 update_func(struct snmp_context *ctx, struct snmp_dependency *dep,
159 enum snmp_depop op)
160 {
161 struct update *upd = (struct update *)dep;
162 struct mibifa *ifa;
163
164 switch (op) {
165
166 case SNMP_DEPOP_COMMIT:
167 if ((ifa = mib_find_ifa(upd->addr)) == NULL) {
168 /* non existing entry - must have ifindex */
169 if (!(upd->set & UPD_IFINDEX))
170 return (SNMP_ERR_INCONS_NAME);
171 return (create(upd));
172 }
173 /* existing entry */
174 if ((upd->set & UPD_IFINDEX) && upd->ifindex == 0) {
175 /* delete */
176 return (destroy(ctx, upd, ifa));
177 }
178 /* modify entry */
179 return (modify(upd, ifa));
180
181 case SNMP_DEPOP_ROLLBACK:
182 if ((ifa = mib_find_ifa(upd->addr)) == NULL) {
183 /* ups */
184 mib_iflist_bad = 1;
185 return (SNMP_ERR_NOERROR);
186 }
187 if (upd->rb & RB_CREATE) {
188 mib_uncreate_ifa(ifa);
189 return (SNMP_ERR_NOERROR);
190 }
191 if (upd->rb & RB_DESTROY) {
192 mib_undestroy_ifa(ifa);
193 return (SNMP_ERR_NOERROR);
194 }
195 if (upd->rb & RB_MODIFY) {
196 ifa->inmask = upd->rb_mask;
197 ifa->inbcast = upd->rb_bcast;
198 mib_unmodify_ifa(ifa);
199 return (SNMP_ERR_NOERROR);
200 }
201 return (SNMP_ERR_NOERROR);
202
203 case SNMP_DEPOP_FINISH:
204 if ((upd->rb & RB_DESTROY) &&
205 (ifa = mib_find_ifa(upd->addr)) != NULL &&
206 (ifa->flags & MIBIFA_DESTROYED)) {
207 TAILQ_REMOVE(&mibifa_list, ifa, link);
208 free(ifa);
209 }
210 return (SNMP_ERR_NOERROR);
211 }
212 abort();
213 }
214
215 /**********************************************************************/
216 /*
217 * ACTION
218 */
219 int
op_ipaddr(struct snmp_context * ctx,struct snmp_value * value,u_int sub,u_int iidx,enum snmp_op op)220 op_ipaddr(struct snmp_context *ctx, struct snmp_value *value,
221 u_int sub, u_int iidx, enum snmp_op op)
222 {
223 asn_subid_t which;
224 struct mibifa *ifa;
225 struct update *upd;
226 struct asn_oid idx;
227 u_char ipaddr[4];
228
229 which = value->var.subs[sub - 1];
230
231 ifa = NULL;
232
233 switch (op) {
234
235 case SNMP_OP_GETNEXT:
236 if ((ifa = NEXT_OBJECT_OID(&mibifa_list, &value->var, sub)) == NULL)
237 return (SNMP_ERR_NOSUCHNAME);
238 index_append(&value->var, sub, &ifa->index);
239 break;
240
241 case SNMP_OP_GET:
242 if ((ifa = FIND_OBJECT_OID(&mibifa_list, &value->var, sub)) == NULL)
243 return (SNMP_ERR_NOSUCHNAME);
244 break;
245
246 case SNMP_OP_SET:
247 if (index_decode(&value->var, sub, iidx, ipaddr))
248 return (SNMP_ERR_NO_CREATION);
249 ifa = FIND_OBJECT_OID(&mibifa_list, &value->var, sub);
250 idx.len = 4;
251 idx.subs[0] = ipaddr[0];
252 idx.subs[1] = ipaddr[1];
253 idx.subs[2] = ipaddr[2];
254 idx.subs[3] = ipaddr[3];
255
256 if ((upd = (struct update *)snmp_dep_lookup(ctx,
257 &oid_ipAddrTable, &idx, sizeof(*upd), update_func)) == NULL)
258 return (SNMP_ERR_RES_UNAVAIL);
259
260 upd->addr.s_addr = htonl((ipaddr[0] << 24) | (ipaddr[1] << 16) |
261 (ipaddr[2] << 8) | (ipaddr[3] << 0));
262
263 switch (which) {
264
265 case LEAF_ipAdEntIfIndex:
266 if (upd->set & UPD_IFINDEX)
267 return (SNMP_ERR_INCONS_VALUE);
268 if (value->v.integer < 0 ||
269 value->v.integer > 0x07fffffff)
270 return (SNMP_ERR_WRONG_VALUE);
271 if (ifa != NULL) {
272 if (ifa->ifindex != (u_int)value->v.integer &&
273 value->v.integer != 0)
274 return (SNMP_ERR_INCONS_VALUE);
275 }
276 upd->set |= UPD_IFINDEX;
277 upd->ifindex = (u_int)value->v.integer;
278 break;
279
280 case LEAF_ipAdEntNetMask:
281 if (upd->set & UPD_MASK)
282 return (SNMP_ERR_INCONS_VALUE);
283 upd->mask.s_addr = htonl((value->v.ipaddress[0] << 24)
284 | (value->v.ipaddress[1] << 16)
285 | (value->v.ipaddress[2] << 8)
286 | (value->v.ipaddress[3] << 0));
287 upd->set |= UPD_MASK;
288 break;
289
290 case LEAF_ipAdEntBcastAddr:
291 if (upd->set & UPD_BCAST)
292 return (SNMP_ERR_INCONS_VALUE);
293 if (value->v.integer != 0 && value->v.integer != 1)
294 return (SNMP_ERR_WRONG_VALUE);
295 upd->bcast = value->v.integer;
296 upd->set |= UPD_BCAST;
297 break;
298
299 }
300 return (SNMP_ERR_NOERROR);
301
302 case SNMP_OP_ROLLBACK:
303 case SNMP_OP_COMMIT:
304 return (SNMP_ERR_NOERROR);
305 }
306
307 switch (which) {
308
309 case LEAF_ipAdEntAddr:
310 value->v.ipaddress[0] = ifa->index.subs[0];
311 value->v.ipaddress[1] = ifa->index.subs[1];
312 value->v.ipaddress[2] = ifa->index.subs[2];
313 value->v.ipaddress[3] = ifa->index.subs[3];
314 break;
315
316 case LEAF_ipAdEntIfIndex:
317 if (ifa->flags & MIBIFA_DESTROYED)
318 value->v.integer = 0;
319 else
320 value->v.integer = ifa->ifindex;
321 break;
322
323 case LEAF_ipAdEntNetMask:
324 value->v.ipaddress[0] = (ntohl(ifa->inmask.s_addr) >> 24) & 0xff;
325 value->v.ipaddress[1] = (ntohl(ifa->inmask.s_addr) >> 16) & 0xff;
326 value->v.ipaddress[2] = (ntohl(ifa->inmask.s_addr) >> 8) & 0xff;
327 value->v.ipaddress[3] = (ntohl(ifa->inmask.s_addr) >> 0) & 0xff;
328 break;
329
330 case LEAF_ipAdEntBcastAddr:
331 value->v.integer = ntohl(ifa->inbcast.s_addr) & 1;
332 break;
333
334
335 case LEAF_ipAdEntReasmMaxSize:
336 value->v.integer = 65535;
337 break;
338 }
339 return (SNMP_ERR_NOERROR);
340 }
341