1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 Adrian Chadd, Xenion Lty Ltd
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #ifdef __FreeBSD__
30 __FBSDID("$FreeBSD$");
31 #endif
32
33 /*
34 * net80211 fast-logging support, primarily for debugging.
35 *
36 * This implements a single debugging queue which includes
37 * per-device enumeration where needed.
38 */
39
40 #include "opt_wlan.h"
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/mbuf.h>
45 #include <sys/malloc.h>
46 #include <sys/endian.h>
47 #include <sys/kernel.h>
48 #include <sys/sysctl.h>
49 #include <sys/pcpu.h>
50 #include <sys/proc.h>
51 #include <sys/ucred.h>
52 #include <sys/alq.h>
53
54 #include <sys/socket.h>
55
56 #include <net/if.h>
57 #include <net/if_var.h>
58 #include <net/if_media.h>
59 #include <net/ethernet.h>
60
61 #include <net80211/ieee80211_var.h>
62 #include <net80211/ieee80211_freebsd.h>
63 #include <net80211/ieee80211_alq.h>
64
65 static struct alq *ieee80211_alq;
66 static int ieee80211_alq_lost;
67 static int ieee80211_alq_logged;
68 static char ieee80211_alq_logfile[MAXPATHLEN] = "/tmp/net80211.log";
69 static unsigned int ieee80211_alq_qsize = 64*1024;
70
71 static int
72 ieee80211_alq_setlogging(int enable)
73 {
74 int error;
75
76 if (enable) {
77 if (ieee80211_alq)
78 alq_close(ieee80211_alq);
79
80 error = alq_open(&ieee80211_alq,
81 ieee80211_alq_logfile,
82 curthread->td_ucred,
83 ALQ_DEFAULT_CMODE,
84 ieee80211_alq_qsize, 0);
85 ieee80211_alq_lost = 0;
86 ieee80211_alq_logged = 0;
87 printf("net80211: logging to %s enabled; "
88 "struct size %d bytes\n",
89 ieee80211_alq_logfile,
90 (int) sizeof(struct ieee80211_alq_rec));
91 } else {
92 if (ieee80211_alq)
93 alq_close(ieee80211_alq);
94 ieee80211_alq = NULL;
95 printf("net80211: logging disabled\n");
96 error = 0;
97 }
98 return (error);
99 }
100
101 static int
102 sysctl_ieee80211_alq_log(SYSCTL_HANDLER_ARGS)
103 {
104 int error, enable;
105
106 enable = (ieee80211_alq != NULL);
107 error = sysctl_handle_int(oidp, &enable, 0, req);
108 if (error || !req->newptr)
109 return (error);
110 else
111 return (ieee80211_alq_setlogging(enable));
112 }
113
114 SYSCTL_PROC(_net_wlan, OID_AUTO, alq,
115 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0,
116 sysctl_ieee80211_alq_log, "I",
117 "Enable net80211 alq logging");
118 SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW,
119 &ieee80211_alq_qsize, 0, "In-memory log size (bytes)");
120 SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW,
121 &ieee80211_alq_lost, 0, "Debugging operations not logged");
122 SYSCTL_INT(_net_wlan, OID_AUTO, alq_logged, CTLFLAG_RW,
123 &ieee80211_alq_logged, 0, "Debugging operations logged");
124
125 static struct ale *
126 ieee80211_alq_get(size_t len)
127 {
128 struct ale *ale;
129
130 ale = alq_getn(ieee80211_alq, len + sizeof(struct ieee80211_alq_rec),
131 ALQ_NOWAIT);
132 if (!ale)
133 ieee80211_alq_lost++;
134 else
135 ieee80211_alq_logged++;
136 return ale;
137 }
138
139 int
140 ieee80211_alq_log(struct ieee80211com *ic, struct ieee80211vap *vap,
141 uint32_t op, uint32_t flags, uint16_t srcid, const uint8_t *src,
142 size_t len)
143 {
144 struct ale *ale;
145 struct ieee80211_alq_rec *r;
146 char *dst;
147
148 /* Don't log if we're disabled */
149 if (ieee80211_alq == NULL)
150 return (0);
151
152 if (len > IEEE80211_ALQ_MAX_PAYLOAD)
153 return (ENOMEM);
154
155 ale = ieee80211_alq_get(len);
156 if (! ale)
157 return (ENOMEM);
158
159 r = (struct ieee80211_alq_rec *) ale->ae_data;
160 dst = ((char *) r) + sizeof(struct ieee80211_alq_rec);
161 r->r_timestamp = htobe64(ticks);
162 if (vap != NULL) {
163 r->r_wlan = htobe16(vap->iv_ifp->if_dunit);
164 } else {
165 r->r_wlan = 0xffff;
166 }
167 r->r_src = htobe16(srcid);
168 r->r_flags = htobe32(flags);
169 r->r_op = htobe32(op);
170 r->r_len = htobe32(len + sizeof(struct ieee80211_alq_rec));
171 r->r_threadid = htobe32((uint32_t) curthread->td_tid);
172
173 if (src != NULL)
174 memcpy(dst, src, len);
175
176 alq_post(ieee80211_alq, ale);
177
178 return (0);
179 }
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