1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 #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 #include <sys/errno.h>
72 #include <sys/conf.h> /* cdevsw struct */
73 #include <sys/uio.h> /* uio struct */
74
75 #include <netinet/in.h>
76 #include <netinet/if_ether.h>
77
78 #include "if_wtapvar.h"
79 #include "if_wtapioctl.h"
80 #include "if_medium.h"
81 #include "wtap_hal/hal.h"
82
83 /* WTAP PLUGINS */
84 #include "plugins/visibility.h"
85
86 MALLOC_DEFINE(M_WTAP, "wtap", "wtap wireless simulator");
87 MALLOC_DEFINE(M_WTAP_PACKET, "wtap packet", "wtap wireless simulator packet");
88 MALLOC_DEFINE(M_WTAP_RXBUF, "wtap rxbuf",
89 "wtap wireless simulator receive buffer");
90 MALLOC_DEFINE(M_WTAP_PLUGIN, "wtap plugin", "wtap wireless simulator plugin");
91
92 static struct wtap_hal *hal;
93
94 /* Function prototypes */
95 static d_ioctl_t wtap_ioctl;
96
97 static struct cdev *sdev;
98 static struct cdevsw wtap_cdevsw = {
99 .d_version = D_VERSION,
100 .d_flags = 0,
101 .d_ioctl = wtap_ioctl,
102 .d_name = "wtapctl",
103 };
104
105 int
wtap_ioctl(struct cdev * dev,u_long cmd,caddr_t data,int fflag,struct thread * td)106 wtap_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
107 int fflag, struct thread *td)
108 {
109 int error = 0;
110
111 CURVNET_SET(CRED_TO_VNET(curthread->td_ucred));
112
113 switch(cmd) {
114 case WTAPIOCTLCRT:
115 if(new_wtap(hal, *(int *)data))
116 error = EINVAL;
117 break;
118 case WTAPIOCTLDEL:
119 if(free_wtap(hal, *(int *)data))
120 error = EINVAL;
121 break;
122 default:
123 DWTAP_PRINTF("Unknown WTAP IOCTL\n");
124 error = EINVAL;
125 }
126
127 CURVNET_RESTORE();
128 return error;
129 }
130
131 /* The function called at load/unload. */
132 static int
event_handler(module_t module,int event,void * arg)133 event_handler(module_t module, int event, void *arg)
134 {
135 struct visibility_plugin *plugin;
136 int e = 0; /* Error, 0 for normal return status */
137
138 switch (event) {
139 case MOD_LOAD:
140 sdev = make_dev(&wtap_cdevsw,0,UID_ROOT,
141 GID_WHEEL,0600,(const char *)"wtapctl");
142 hal = (struct wtap_hal *)malloc(sizeof(struct wtap_hal),
143 M_WTAP, M_NOWAIT | M_ZERO);
144
145 init_hal(hal);
146
147 /* Setting up a simple plugin */
148 plugin = (struct visibility_plugin *)malloc
149 (sizeof(struct visibility_plugin), M_WTAP_PLUGIN,
150 M_NOWAIT | M_ZERO);
151 plugin->base.wp_hal = hal;
152 plugin->base.init = visibility_init;
153 plugin->base.deinit = visibility_deinit;
154 plugin->base.work = visibility_work;
155 register_plugin(hal, (struct wtap_plugin *)plugin);
156
157 printf("Loaded wtap wireless simulator\n");
158 break;
159 case MOD_UNLOAD:
160 destroy_dev(sdev);
161 deregister_plugin(hal);
162 deinit_hal(hal);
163 free(hal, M_WTAP);
164 printf("Unloading wtap wireless simulator\n");
165 break;
166 default:
167 e = EOPNOTSUPP; /* Error, Operation Not Supported */
168 break;
169 }
170
171 return(e);
172 }
173
174 /* The second argument of DECLARE_MODULE. */
175 static moduledata_t wtap_conf = {
176 "wtap", /* module name */
177 event_handler, /* event handler */
178 NULL /* extra data */
179 };
180
181 DECLARE_MODULE(wtap, wtap_conf, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
182 MODULE_DEPEND(wtap, wlan, 1, 1, 1); /* 802.11 media layer */
183