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("$FreeBSD$");
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] = "/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		ieee80211_alq_logged = 0;
88		printf("net80211: logging to %s enabled; struct size %d bytes\n",
89		    ieee80211_alq_logfile, sizeof(struct ieee80211_alq_rec));
90	} else {
91		if (ieee80211_alq)
92			alq_close(ieee80211_alq);
93		ieee80211_alq = NULL;
94		printf("net80211: logging disabled\n");
95		error = 0;
96	}
97	return (error);
98}
99
100static int
101sysctl_ieee80211_alq_log(SYSCTL_HANDLER_ARGS)
102{
103        int error, enable;
104
105        enable = (ieee80211_alq != NULL);
106        error = sysctl_handle_int(oidp, &enable, 0, req);
107        if (error || !req->newptr)
108                return (error);
109        else
110                return (ieee80211_alq_setlogging(enable));
111}
112
113SYSCTL_PROC(_net_wlan, OID_AUTO, alq, CTLTYPE_INT|CTLFLAG_RW,
114	0, 0, sysctl_ieee80211_alq_log, "I", "Enable net80211 alq logging");
115SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW,
116	&ieee80211_alq_qsize, 0, "In-memory log size (#records)");
117SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW,
118	&ieee80211_alq_lost, 0, "Debugging operations not logged");
119SYSCTL_INT(_net_wlan, OID_AUTO, alq_logged, CTLFLAG_RW,
120	&ieee80211_alq_logged, 0, "Debugging operations logged");
121
122static struct ale *
123ieee80211_alq_get(void)
124{
125	struct ale *ale;
126
127	ale = alq_get(ieee80211_alq, ALQ_NOWAIT);
128	if (!ale)
129		ieee80211_alq_lost++;
130	else
131		ieee80211_alq_logged++;
132	return ale;
133}
134
135void
136ieee80211_alq_log(struct ieee80211vap *vap, uint8_t op, u_char *p, int l)
137{
138	struct ale *ale;
139	struct ieee80211_alq_rec *r;
140
141	if (ieee80211_alq == NULL)
142		return;
143
144	ale = ieee80211_alq_get();
145	if (! ale)
146		return;
147
148	r = (struct ieee80211_alq_rec *) ale->ae_data;
149	r->r_timestamp = htonl(ticks);
150	r->r_version = 1;
151	r->r_wlan = htons(vap->iv_ifp->if_dunit);
152	r->r_op = op;
153	memcpy(&r->r_payload, p, MIN(l, sizeof(r->r_payload)));
154	alq_post(ieee80211_alq, ale);
155}
156