1/*-
2 * Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB
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 *    without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13 *    redistribution must be conditioned upon including a substantially
14 *    similar Disclaimer requirement for further binary redistribution.
15 *
16 * NO WARRANTY
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGES.
28 *
29 * $FreeBSD: releng/11.0/sys/dev/wtap/if_wtap_module.c 298931 2016-05-02 16:47:28Z pfg $
30 */
31#include <sys/param.h>
32#include <sys/module.h>
33#include <sys/kernel.h>
34#include <sys/systm.h>
35#include <sys/sysctl.h>
36#include <sys/mbuf.h>
37#include <sys/malloc.h>
38#include <sys/lock.h>
39#include <sys/mutex.h>
40#include <sys/proc.h>
41#include <sys/ucred.h>
42#include <sys/jail.h>
43
44#include <sys/sockio.h>
45#include <sys/socket.h>
46#include <sys/socketvar.h>
47#include <sys/errno.h>
48#include <sys/callout.h>
49#include <sys/endian.h>
50#include <sys/kthread.h>
51#include <sys/taskqueue.h>
52#include <sys/priv.h>
53#include <sys/sysctl.h>
54
55#include <machine/bus.h>
56
57#include <net/if.h>
58#include <net/if_dl.h>
59#include <net/if_media.h>
60#include <net/if_types.h>
61#include <net/if_arp.h>
62#include <net/ethernet.h>
63#include <net/if_llc.h>
64#include <net/vnet.h>
65
66#include <net80211/ieee80211_var.h>
67#include <net80211/ieee80211_regdomain.h>
68
69#include <net/bpf.h>
70
71
72#include <sys/errno.h>
73#include <sys/conf.h>   /* cdevsw struct */
74#include <sys/uio.h>    /* uio struct */
75
76
77#include <netinet/in.h>
78#include <netinet/if_ether.h>
79
80#include "if_wtapvar.h"
81#include "if_wtapioctl.h"
82#include "if_medium.h"
83#include "wtap_hal/hal.h"
84
85/* WTAP PLUGINS */
86#include "plugins/visibility.h"
87
88MALLOC_DEFINE(M_WTAP, "wtap", "wtap wireless simulator");
89MALLOC_DEFINE(M_WTAP_PACKET, "wtap packet", "wtap wireless simulator packet");
90MALLOC_DEFINE(M_WTAP_RXBUF, "wtap rxbuf",
91    "wtap wireless simulator receive buffer");
92MALLOC_DEFINE(M_WTAP_PLUGIN, "wtap plugin", "wtap wireless simulator plugin");
93
94static struct wtap_hal		*hal;
95
96/* Function prototypes */
97static d_ioctl_t	wtap_ioctl;
98
99static struct cdev *sdev;
100static struct cdevsw wtap_cdevsw = {
101	.d_version =	D_VERSION,
102	.d_flags =	0,
103	.d_ioctl =	wtap_ioctl,
104	.d_name =	"wtapctl",
105};
106
107int
108wtap_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
109    int fflag, struct thread *td)
110{
111	int error = 0;
112
113	CURVNET_SET(CRED_TO_VNET(curthread->td_ucred));
114
115	switch(cmd) {
116	case WTAPIOCTLCRT:
117		if(new_wtap(hal, *(int *)data))
118			error = EINVAL;
119		break;
120	case WTAPIOCTLDEL:
121		if(free_wtap(hal, *(int *)data))
122			error = EINVAL;
123		break;
124	default:
125		DWTAP_PRINTF("Unknown WTAP IOCTL\n");
126		error = EINVAL;
127	}
128
129	CURVNET_RESTORE();
130	return error;
131}
132
133
134/* The function called at load/unload. */
135static int
136event_handler(module_t module, int event, void *arg)
137{
138	struct visibility_plugin *plugin;
139	int e = 0; /* Error, 0 for normal return status */
140
141	switch (event) {
142	case MOD_LOAD:
143		sdev = make_dev(&wtap_cdevsw,0,UID_ROOT,
144		    GID_WHEEL,0600,(const char *)"wtapctl");
145		hal = (struct wtap_hal *)malloc(sizeof(struct wtap_hal),
146		    M_WTAP, M_NOWAIT | M_ZERO);
147		bzero(hal, sizeof(struct wtap_hal));
148
149		init_hal(hal);
150
151		/* Setting up a simple plugin */
152		plugin = (struct visibility_plugin *)malloc
153		    (sizeof(struct visibility_plugin), M_WTAP_PLUGIN,
154		    M_NOWAIT | M_ZERO);
155		plugin->base.wp_hal  = hal;
156		plugin->base.init = visibility_init;
157		plugin->base.deinit = visibility_deinit;
158		plugin->base.work = visibility_work;
159		register_plugin(hal, (struct wtap_plugin *)plugin);
160
161                printf("Loaded wtap wireless simulator\n");
162                break;
163	case MOD_UNLOAD:
164		destroy_dev(sdev);
165		deregister_plugin(hal);
166		deinit_hal(hal);
167		free(hal, M_WTAP);
168		printf("Unloading wtap wireless simulator\n");
169		break;
170	default:
171		e = EOPNOTSUPP; /* Error, Operation Not Supported */
172		break;
173	}
174
175	return(e);
176}
177
178/* The second argument of DECLARE_MODULE. */
179static moduledata_t wtap_conf = {
180	"wtap",		/* module name */
181	event_handler,	/* event handler */
182	NULL		/* extra data */
183};
184
185DECLARE_MODULE(wtap, wtap_conf, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
186MODULE_DEPEND(wtap, wlan, 1, 1, 1);	/* 802.11 media layer */
187