ieee80211_alq.c revision 221781 
1/*-
2 * Copyright (c) 2011 Adrian Chadd, Xenion Lty Ltd
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27#ifdef __FreeBSD__
28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_alq.c 221781 2011-05-11 16:44:19Z adrian $");
29#endif
30
31/*
32 * net80211 fast-logging support, primarily for debugging.
33 *
34 * This implements a single debugging queue which includes
35 * per-device enumeration where needed.
36 */
37
38#include "opt_wlan.h"
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/mbuf.h>
43#include <sys/malloc.h>
44#include <sys/endian.h>
45#include <sys/kernel.h>
46#include <sys/sysctl.h>
47#include <sys/pcpu.h>
48#include <sys/proc.h>
49#include <sys/ucred.h>
50#include <sys/alq.h>
51
52#include <sys/socket.h>
53
54#include <net/if.h>
55#include <net/if_var.h>
56#include <net/if_dl.h>
57#include <net/if_clone.h>
58#include <net/if_media.h>
59#include <net/if_types.h>
60
61#include <net80211/ieee80211_var.h>
62#include <net80211/ieee80211_freebsd.h>
63#include <net80211/ieee80211_alq.h>
64
65static struct alq *ieee80211_alq;
66static int ieee80211_alq_lost;
67static int ieee80211_alq_logged;
68static char ieee80211_alq_logfile[MAXPATHLEN] = "/mnt/tmp/net80211.log";
69static unsigned int ieee80211_alq_qsize = 64*1024;
70
71static int
72ieee80211_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		    sizeof (struct ieee80211_alq_rec),
85		    ieee80211_alq_qsize);
86		ieee80211_alq_lost = 0;
87		printf("net80211: logging to %s enabled\n", ieee80211_alq_logfile);
88	} else {
89		if (ieee80211_alq)
90			alq_close(ieee80211_alq);
91		ieee80211_alq = NULL;
92		printf("net80211: logging disabled\n");
93		error = 0;
94	}
95	return (error);
96}
97
98static int
99sysctl_ieee80211_alq_log(SYSCTL_HANDLER_ARGS)
100{
101        int error, enable;
102
103        enable = (ieee80211_alq != NULL);
104        error = sysctl_handle_int(oidp, &enable, 0, req);
105        if (error || !req->newptr)
106                return (error);
107        else
108                return (ieee80211_alq_setlogging(enable));
109}
110
111SYSCTL_PROC(_net_wlan, OID_AUTO, alq, CTLTYPE_INT|CTLFLAG_RW,
112	0, 0, sysctl_ieee80211_alq_log, "I", "Enable net80211 alq logging");
113SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW,
114	&ieee80211_alq_qsize, 0, "In-memory log size (#records)");
115SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW,
116	&ieee80211_alq_lost, 0, "Debugging operations not logged");
117SYSCTL_INT(_net_wlan, OID_AUTO, alq_logged, CTLFLAG_RW,
118	&ieee80211_alq_logged, 0, "Debugging operations logged");
119
120static struct ale *
121ieee80211_alq_get(void)
122{
123	struct ale *ale;
124
125	ale = alq_get(ieee80211_alq, ALQ_NOWAIT);
126	if (!ale)
127		ieee80211_alq_lost++;
128	else
129		ieee80211_alq_logged++;
130	return ale;
131}
132
133void
134ieee80211_alq_log(struct ieee80211vap *vap, uint8_t op, u_char *p, int l)
135{
136	struct ale *ale;
137	struct ieee80211_alq_rec *r;
138
139	if (ieee80211_alq == NULL)
140		return;
141
142	ale = ieee80211_alq_get();
143	if (! ale)
144		return;
145
146	r = (struct ieee80211_alq_rec *) ale;
147	r->r_timestamp = htonl(ticks);
148	r->r_version = 1;
149	r->r_wlan = htons(vap->iv_ifp->if_dunit);
150	r->r_op = op;
151	memcpy(&r->r_payload, p, MIN(l, sizeof(r->r_payload)));
152	alq_post(ieee80211_alq, ale);
153}
154