1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24 /* Copyright (c) 1990 Mentat Inc. */
25
26 /*
27 * This file contains common code for handling Options Management requests
28 * for SNMP/MIB.
29 */
30
31 #include <sys/types.h>
32 #include <sys/stream.h>
33 #include <sys/stropts.h>
34 #include <sys/errno.h>
35 #define _SUN_TPI_VERSION 2
36 #include <sys/tihdr.h>
37 #include <sys/ddi.h>
38 #include <sys/cmn_err.h>
39 #include <sys/policy.h>
40
41 #include <sys/socket.h>
42 #include <netinet/in.h>
43
44 #include <inet/common.h>
45 #include <inet/mi.h>
46 #include <inet/mib2.h>
47 #include <inet/optcom.h>
48 #include <inet/snmpcom.h>
49
50 #include <inet/ip.h>
51 #include <sys/brand.h>
52
53 #define DEFAULT_LENGTH sizeof (long)
54 #define DATA_MBLK_SIZE 1024
55 #define TOAHDR_SIZE (sizeof (struct T_optmgmt_ack) +\
56 sizeof (struct opthdr))
57
58 /* SNMP Option Request Structure */
59 typedef struct sor_s {
60 int sor_group;
61 int sor_code; /* MIB2 index value */
62 int sor_size;
63 } sor_t;
64
65 /*
66 * Validation Table for set requests.
67 */
68 static sor_t req_arr[] = {
69 { MIB2_IP, 1, sizeof (int) },
70 { MIB2_IP, 2, sizeof (int) },
71 { MIB2_IP, 21, sizeof (mib2_ipRouteEntry_t) },
72 { MIB2_IP, 22, sizeof (mib2_ipNetToMediaEntry_t)},
73 { MIB2_TCP, 13, sizeof (mib2_tcpConnEntry_t) }
74 };
75
76 /*
77 * Binary compatibility to what used to be T_CURRENT in older releases.
78 * Unfortunately, the binary chosen for it was different and used by
79 * T_PARTSUCCESS in the new name space. However T_PARTSUCESS is only
80 * anticiapted in new T_OPTMGM_REQ (and not O_T_OPTMGMT_REQ messages).
81 * Only a test for TBADFLAG which uses one of the MIB option levels
82 * may have trouble with this provision for binary compatibility.
83 */
84 #define OLD_T_CURRENT 0x100 /* same value as T_PARTSUCCESS */
85
86 /*
87 * MIB info returned in data part of M_PROTO msg. All info for a single
88 * request is appended in a chain of mblk's off of the M_PROTO T_OPTMGMT_ACK
89 * ctl buffer.
90 */
91 int
92 snmp_append_data(mblk_t *mpdata, char *blob, int len)
93 {
94
95 if (!mpdata)
96 return (0);
97 while (mpdata->b_cont)
98 mpdata = mpdata->b_cont;
99 if (mpdata->b_wptr + len >= mpdata->b_datap->db_lim) {
100 mpdata->b_cont = allocb(DATA_MBLK_SIZE, BPRI_HI);
101 mpdata = mpdata->b_cont;
102 if (!mpdata)
103 return (0);
104 }
105 bcopy(blob, (char *)mpdata->b_wptr, len);
106 mpdata->b_wptr += len;
107 return (1);
108 }
109
110 /*
111 * Need a form which avoids O(n^2) behavior locating the end of the
112 * chain every time. This is it.
113 */
114 int
115 snmp_append_data2(mblk_t *mpdata, mblk_t **last_mpp, char *blob, int len)
116 {
117
118 if (!mpdata)
119 return (0);
120 if (*last_mpp == NULL) {
121 while (mpdata->b_cont)
122 mpdata = mpdata->b_cont;
123 *last_mpp = mpdata;
124 }
125 if ((*last_mpp)->b_wptr + len >= (*last_mpp)->b_datap->db_lim) {
126 (*last_mpp)->b_cont = allocb(DATA_MBLK_SIZE, BPRI_HI);
127 *last_mpp = (*last_mpp)->b_cont;
128 if (!*last_mpp)
129 return (0);
130 }
131 bcopy(blob, (char *)(*last_mpp)->b_wptr, len);
132 (*last_mpp)->b_wptr += len;
133 return (1);
134 }
135
136 /*
137 * SNMP requests are issued using putmsg() on a stream containing all
138 * relevant modules. The ctl part contains a O_T_OPTMGMT_REQ message,
139 * and the data part is NULL
140 * to process this msg. If snmpcom_req() returns FALSE, then the module
141 * will try optcom_req to see if its some sort of SOCKET or IP option.
142 * snmpcom_req returns TRUE whenever the first option is recognized as
143 * an SNMP request, even if a bad one.
144 *
145 * "get" is done by a single O_T_OPTMGMT_REQ with MGMT_flags set to T_CURRENT.
146 * All modules respond with one or msg's about what they know. Responses
147 * are in T_OPTMGMT_ACK format. The opthdr level/name fields identify what
148 * is begin returned, the len field how big it is (in bytes). The info
149 * itself is in the data portion of the msg. Fixed length info returned
150 * in one msg; each table in a separate msg.
151 *
152 * setfn() returns 1 if things ok, 0 if set request invalid or otherwise
153 * messed up.
154 *
155 * If the passed q is at the bottom of the module chain (q_next == NULL,
156 * a ctl msg with req->name, level, len all zero is sent upstream. This
157 * is and EOD flag to the caller.
158 *
159 * IMPORTANT:
160 * - The msg type is M_PROTO, not M_PCPROTO!!! This is by design,
161 * since multiple messages will be sent to stream head and we want
162 * them queued for reading, not discarded.
163 * - All requests which match a table entry are sent to all get/set functions
164 * of each module. The functions must simply ignore requests not meant
165 * for them: getfn() returns 0, setfn() returns 1.
166 */
167 boolean_t
168 snmpcom_req(queue_t *q, mblk_t *mp, pfi_t setfn, pfi_t getfn, cred_t *credp)
169 {
170 mblk_t *mpctl;
171 struct opthdr *req;
172 struct opthdr *next_req;
173 struct opthdr *req_end;
174 struct opthdr *req_start;
175 sor_t *sreq;
176 struct T_optmgmt_req *tor = (struct T_optmgmt_req *)mp->b_rptr;
177 struct T_optmgmt_ack *toa;
178 boolean_t legacy_req;
179
180 if (mp->b_cont) { /* don't deal with multiple mblk's */
181 freemsg(mp->b_cont);
182 mp->b_cont = (mblk_t *)0;
183 optcom_err_ack(q, mp, TSYSERR, EBADMSG);
184 return (B_TRUE);
185 }
186 if ((mp->b_wptr - mp->b_rptr) < sizeof (struct T_optmgmt_req) ||
187 !(req_start = (struct opthdr *)mi_offset_param(mp,
188 tor->OPT_offset, tor->OPT_length)))
189 goto bad_req1;
190 if (! __TPI_OPT_ISALIGNED(req_start))
191 goto bad_req1;
192
193 /*
194 * if first option not in the MIB2 or EXPER range, return false so
195 * optcom_req can scope things out. Otherwise it's passed to each
196 * calling module to process or ignore as it sees fit.
197 */
198 if ((!(req_start->level >= MIB2_RANGE_START &&
199 req_start->level <= MIB2_RANGE_END)) &&
200 (!(req_start->level >= EXPER_RANGE_START &&
201 req_start->level <= EXPER_RANGE_END)))
202 return (B_FALSE);
203
204 switch (tor->MGMT_flags) {
205
206 case T_NEGOTIATE:
207 if (secpolicy_ip_config(credp, B_FALSE) != 0) {
208 optcom_err_ack(q, mp, TACCES, 0);
209 return (B_TRUE);
210 }
211 req_end = (struct opthdr *)((uchar_t *)req_start +
212 tor->OPT_length);
213 for (req = req_start; req < req_end; req = next_req) {
214 next_req =
215 (struct opthdr *)((uchar_t *)&req[1] +
216 _TPI_ALIGN_OPT(req->len));
217 if (next_req > req_end)
218 goto bad_req2;
219 for (sreq = req_arr; sreq < A_END(req_arr); sreq++) {
220 if (req->level == sreq->sor_group &&
221 req->name == sreq->sor_code)
222 break;
223 }
224 if (sreq >= A_END(req_arr))
225 goto bad_req3;
226 if (!(*setfn)(q, req->level, req->name,
227 (uchar_t *)&req[1], req->len))
228 goto bad_req4;
229 }
230 if (q->q_next != NULL)
231 putnext(q, mp);
232 else
233 freemsg(mp);
234 return (B_TRUE);
235
236 case OLD_T_CURRENT:
237 case T_CURRENT:
238 mpctl = allocb(TOAHDR_SIZE, BPRI_MED);
239 if (!mpctl) {
240 optcom_err_ack(q, mp, TSYSERR, ENOMEM);
241 return (B_TRUE);
242 }
243 mpctl->b_cont = allocb(DATA_MBLK_SIZE, BPRI_MED);
244 if (!mpctl->b_cont) {
245 freemsg(mpctl);
246 optcom_err_ack(q, mp, TSYSERR, ENOMEM);
247 return (B_TRUE);
248 }
249 mpctl->b_datap->db_type = M_PROTO;
250 mpctl->b_wptr += TOAHDR_SIZE;
251 toa = (struct T_optmgmt_ack *)mpctl->b_rptr;
252 toa->PRIM_type = T_OPTMGMT_ACK;
253 toa->OPT_offset = sizeof (struct T_optmgmt_ack);
254 toa->OPT_length = sizeof (struct opthdr);
255 toa->MGMT_flags = T_SUCCESS;
256 /*
257 * If the current process is running inside a solaris10-
258 * branded zone and len is 0 then it's a request for
259 * legacy data.
260 */
261 if (PROC_IS_BRANDED(curproc) &&
262 (strcmp(curproc->p_brand->b_name, "solaris10") == 0) &&
263 (req_start->len == 0))
264 legacy_req = B_TRUE;
265 else
266 legacy_req = B_FALSE;
267 if (!(*getfn)(q, mpctl, req_start->level, legacy_req))
268 freemsg(mpctl);
269 /*
270 * all data for this module has now been sent upstream. If
271 * this is bottom module of stream, send up an EOD ctl msg,
272 * otherwise pass onto the next guy for processing.
273 */
274 if (q->q_next != NULL) {
275 putnext(q, mp);
276 return (B_TRUE);
277 }
278 if (mp->b_cont) {
279 freemsg(mp->b_cont);
280 mp->b_cont = NULL;
281 }
282 mpctl = reallocb(mp, TOAHDR_SIZE, 1);
283 if (!mpctl) {
284 optcom_err_ack(q, mp, TSYSERR, ENOMEM);
285 return (B_TRUE);
286 }
287 mpctl->b_datap->db_type = M_PROTO;
288 mpctl->b_wptr = mpctl->b_rptr + TOAHDR_SIZE;
289 toa = (struct T_optmgmt_ack *)mpctl->b_rptr;
290 toa->PRIM_type = T_OPTMGMT_ACK;
291 toa->OPT_offset = sizeof (struct T_optmgmt_ack);
292 toa->OPT_length = sizeof (struct opthdr);
293 toa->MGMT_flags = T_SUCCESS;
294 req = (struct opthdr *)&toa[1];
295 req->level = 0;
296 req->name = 0;
297 req->len = 0;
298 qreply(q, mpctl);
299 return (B_TRUE);
300
301 default:
302 optcom_err_ack(q, mp, TBADFLAG, 0);
303 return (B_TRUE);
304 }
305
306 bad_req1:;
307 printf("snmpcom bad_req1\n");
308 goto bad_req;
309 bad_req2:;
310 printf("snmpcom bad_req2\n");
311 goto bad_req;
312 bad_req3:;
313 printf("snmpcom bad_req3\n");
314 goto bad_req;
315 bad_req4:;
316 printf("snmpcom bad_req4\n");
317 /* FALLTHRU */
318 bad_req:;
319 optcom_err_ack(q, mp, TBADOPT, 0);
320 return (B_TRUE);
321
322 }