xref: /freebsd/sys/dev/wtap/if_wtap_module.c (revision cddbc3b40812213ff00041f79174cac0be360a2a)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB
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  *    without modification.
13  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
14  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
15  *    redistribution must be conditioned upon including a substantially
16  *    similar Disclaimer requirement for further binary redistribution.
17  *
18  * NO WARRANTY
19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
22  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
23  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
24  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
27  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
29  * THE POSSIBILITY OF SUCH DAMAGES.
30  *
31  * $FreeBSD$
32  */
33 #include <sys/param.h>
34 #include <sys/module.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/sysctl.h>
38 #include <sys/mbuf.h>
39 #include <sys/malloc.h>
40 #include <sys/lock.h>
41 #include <sys/mutex.h>
42 #include <sys/proc.h>
43 #include <sys/ucred.h>
44 #include <sys/jail.h>
45 
46 #include <sys/sockio.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/errno.h>
50 #include <sys/callout.h>
51 #include <sys/endian.h>
52 #include <sys/kthread.h>
53 #include <sys/taskqueue.h>
54 #include <sys/priv.h>
55 #include <sys/sysctl.h>
56 
57 #include <machine/bus.h>
58 
59 #include <net/if.h>
60 #include <net/if_dl.h>
61 #include <net/if_media.h>
62 #include <net/if_types.h>
63 #include <net/if_arp.h>
64 #include <net/ethernet.h>
65 #include <net/if_llc.h>
66 #include <net/vnet.h>
67 
68 #include <net80211/ieee80211_var.h>
69 #include <net80211/ieee80211_regdomain.h>
70 
71 #include <net/bpf.h>
72 
73 
74 #include <sys/errno.h>
75 #include <sys/conf.h>   /* cdevsw struct */
76 #include <sys/uio.h>    /* uio struct */
77 
78 
79 #include <netinet/in.h>
80 #include <netinet/if_ether.h>
81 
82 #include "if_wtapvar.h"
83 #include "if_wtapioctl.h"
84 #include "if_medium.h"
85 #include "wtap_hal/hal.h"
86 
87 /* WTAP PLUGINS */
88 #include "plugins/visibility.h"
89 
90 MALLOC_DEFINE(M_WTAP, "wtap", "wtap wireless simulator");
91 MALLOC_DEFINE(M_WTAP_PACKET, "wtap packet", "wtap wireless simulator packet");
92 MALLOC_DEFINE(M_WTAP_RXBUF, "wtap rxbuf",
93     "wtap wireless simulator receive buffer");
94 MALLOC_DEFINE(M_WTAP_PLUGIN, "wtap plugin", "wtap wireless simulator plugin");
95 
96 static struct wtap_hal		*hal;
97 
98 /* Function prototypes */
99 static d_ioctl_t	wtap_ioctl;
100 
101 static struct cdev *sdev;
102 static struct cdevsw wtap_cdevsw = {
103 	.d_version =	D_VERSION,
104 	.d_flags =	0,
105 	.d_ioctl =	wtap_ioctl,
106 	.d_name =	"wtapctl",
107 };
108 
109 int
110 wtap_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
111     int fflag, struct thread *td)
112 {
113 	int error = 0;
114 
115 	CURVNET_SET(CRED_TO_VNET(curthread->td_ucred));
116 
117 	switch(cmd) {
118 	case WTAPIOCTLCRT:
119 		if(new_wtap(hal, *(int *)data))
120 			error = EINVAL;
121 		break;
122 	case WTAPIOCTLDEL:
123 		if(free_wtap(hal, *(int *)data))
124 			error = EINVAL;
125 		break;
126 	default:
127 		DWTAP_PRINTF("Unknown WTAP IOCTL\n");
128 		error = EINVAL;
129 	}
130 
131 	CURVNET_RESTORE();
132 	return error;
133 }
134 
135 
136 /* The function called at load/unload. */
137 static int
138 event_handler(module_t module, int event, void *arg)
139 {
140 	struct visibility_plugin *plugin;
141 	int e = 0; /* Error, 0 for normal return status */
142 
143 	switch (event) {
144 	case MOD_LOAD:
145 		sdev = make_dev(&wtap_cdevsw,0,UID_ROOT,
146 		    GID_WHEEL,0600,(const char *)"wtapctl");
147 		hal = (struct wtap_hal *)malloc(sizeof(struct wtap_hal),
148 		    M_WTAP, M_NOWAIT | M_ZERO);
149 		bzero(hal, sizeof(struct wtap_hal));
150 
151 		init_hal(hal);
152 
153 		/* Setting up a simple plugin */
154 		plugin = (struct visibility_plugin *)malloc
155 		    (sizeof(struct visibility_plugin), M_WTAP_PLUGIN,
156 		    M_NOWAIT | M_ZERO);
157 		plugin->base.wp_hal  = hal;
158 		plugin->base.init = visibility_init;
159 		plugin->base.deinit = visibility_deinit;
160 		plugin->base.work = visibility_work;
161 		register_plugin(hal, (struct wtap_plugin *)plugin);
162 
163                 printf("Loaded wtap wireless simulator\n");
164                 break;
165 	case MOD_UNLOAD:
166 		destroy_dev(sdev);
167 		deregister_plugin(hal);
168 		deinit_hal(hal);
169 		free(hal, M_WTAP);
170 		printf("Unloading wtap wireless simulator\n");
171 		break;
172 	default:
173 		e = EOPNOTSUPP; /* Error, Operation Not Supported */
174 		break;
175 	}
176 
177 	return(e);
178 }
179 
180 /* The second argument of DECLARE_MODULE. */
181 static moduledata_t wtap_conf = {
182 	"wtap",		/* module name */
183 	event_handler,	/* event handler */
184 	NULL		/* extra data */
185 };
186 
187 DECLARE_MODULE(wtap, wtap_conf, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
188 MODULE_DEPEND(wtap, wlan, 1, 1, 1);	/* 802.11 media layer */
189