ieee80211_alq.c revision 220908 
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 220908 2011-04-21 03:59:37Z 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 char ieee80211_alq_logfile[MAXPATHLEN] = "/tmp/net80211.log";
68static unsigned int ieee80211_alq_qsize = 64*1024;
69
70static int
71ieee80211_alq_setlogging(int enable)
72{
73	int error;
74
75	if (enable) {
76		if (ieee80211_alq)
77			alq_close(ieee80211_alq);
78
79		error = alq_open(&ieee80211_alq,
80		    ieee80211_alq_logfile,
81		    curthread->td_ucred,
82		    ALQ_DEFAULT_CMODE,
83		    sizeof (struct ieee80211_alq_rec),
84		    ieee80211_alq_qsize);
85		ieee80211_alq_lost = 0;
86		printf("net80211: logging to %s enabled\n", ieee80211_alq_logfile);
87	} else {
88		if (ieee80211_alq)
89			alq_close(ieee80211_alq);
90		ieee80211_alq = NULL;
91		printf("net80211: logging disabled\n");
92		error = 0;
93	}
94	return (error);
95}
96
97static int
98sysctl_ieee80211_alq_log(SYSCTL_HANDLER_ARGS)
99{
100        int error, enable;
101
102        enable = (ieee80211_alq != NULL);
103        error = sysctl_handle_int(oidp, &enable, 0, req);
104        if (error || !req->newptr)
105                return (error);
106        else
107                return (ieee80211_alq_setlogging(enable));
108}
109
110SYSCTL_PROC(_net_wlan, OID_AUTO, alq, CTLTYPE_INT|CTLFLAG_RW,
111	0, 0, sysctl_ieee80211_alq_log, "I", "Enable net80211 alq logging");
112SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW,
113	&ieee80211_alq_qsize, 0, "In-memory log size (#records)");
114SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW,
115	&ieee80211_alq_lost, 0, "Debugging operations not logged");
116
117static struct ale *
118ieee80211_alq_get(void)
119{
120	struct ale *ale;
121
122	ale = alq_get(ieee80211_alq, ALQ_NOWAIT);
123	if (!ale)
124		ieee80211_alq_lost++;
125	return ale;
126}
127
128void
129ieee80211_alq_log(struct ieee80211vap *vap, uint8_t op, u_char *p, int l)
130{
131	struct ale *ale;
132	struct ieee80211_alq_rec *r;
133
134	ale = ieee80211_alq_get();
135	if (! ale)
136		return;
137
138	r = (struct ieee80211_alq_rec *) ale;
139	r->r_timestamp = ticks;
140	r->r_version = 1;
141	r->r_wlan = vap->iv_ifp->if_dunit;
142	r->r_op = op;
143	memcpy(&r->r_payload, p, MIN(l, sizeof(r->r_payload)));
144}
145