1 /*-
2 * Copyright (c) 2003-2005 Sam Leffler, Errno Consulting
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 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/6.2/sys/net80211/ieee80211_freebsd.c 160221 2006-07-10 00:41:00Z sam $");
30
31 /*
32 * IEEE 802.11 support (FreeBSD-specific code)
33 */
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/linker.h>
38 #include <sys/mbuf.h>
39 #include <sys/module.h>
40 #include <sys/proc.h>
41 #include <sys/sysctl.h>
42
43 #include <sys/socket.h>
44
45 #include <net/if.h>
46 #include <net/if_media.h>
47 #include <net/ethernet.h>
48 #include <net/route.h>
49
50 #include <net80211/ieee80211_var.h>
51
52 SYSCTL_NODE(_net, OID_AUTO, wlan, CTLFLAG_RD, 0, "IEEE 80211 parameters");
53
54 #ifdef IEEE80211_DEBUG
55 int ieee80211_debug = 0;
56 SYSCTL_INT(_net_wlan, OID_AUTO, debug, CTLFLAG_RW, &ieee80211_debug,
57 0, "debugging printfs");
58 #endif
59
60 static int
61 ieee80211_sysctl_inact(SYSCTL_HANDLER_ARGS)
62 {
63 int inact = (*(int *)arg1) * IEEE80211_INACT_WAIT;
64 int error;
65
66 error = sysctl_handle_int(oidp, &inact, 0, req);
67 if (error || !req->newptr)
68 return error;
69 *(int *)arg1 = inact / IEEE80211_INACT_WAIT;
70 return 0;
71 }
72
73 static int
74 ieee80211_sysctl_parent(SYSCTL_HANDLER_ARGS)
75 {
76 struct ieee80211com *ic = arg1;
77 const char *name = ic->ic_ifp->if_xname;
78
79 return SYSCTL_OUT(req, name, strlen(name));
80 }
81
82 void
83 ieee80211_sysctl_attach(struct ieee80211com *ic)
84 {
85 struct sysctl_ctx_list *ctx;
86 struct sysctl_oid *oid;
87 char num[14]; /* sufficient for 32 bits */
88
89 MALLOC(ctx, struct sysctl_ctx_list *, sizeof(struct sysctl_ctx_list),
90 M_DEVBUF, M_NOWAIT | M_ZERO);
91 if (ctx == NULL) {
92 if_printf(ic->ic_ifp, "%s: cannot allocate sysctl context!\n",
93 __func__);
94 return;
95 }
96 sysctl_ctx_init(ctx);
97 snprintf(num, sizeof(num), "%u", ic->ic_vap);
98 oid = SYSCTL_ADD_NODE(ctx, &SYSCTL_NODE_CHILDREN(_net, wlan),
99 OID_AUTO, num, CTLFLAG_RD, NULL, "");
100 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
101 "%parent", CTLFLAG_RD, ic, 0, ieee80211_sysctl_parent, "A",
102 "parent device");
103 #ifdef IEEE80211_DEBUG
104 ic->ic_debug = ieee80211_debug;
105 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
106 "debug", CTLFLAG_RW, &ic->ic_debug, 0,
107 "control debugging printfs");
108 #endif
109 /* XXX inherit from tunables */
110 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
111 "inact_run", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_run, 0,
112 ieee80211_sysctl_inact, "I",
113 "station inactivity timeout (sec)");
114 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
115 "inact_probe", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_probe, 0,
116 ieee80211_sysctl_inact, "I",
117 "station inactivity probe timeout (sec)");
118 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
119 "inact_auth", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_auth, 0,
120 ieee80211_sysctl_inact, "I",
121 "station authentication timeout (sec)");
122 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
123 "inact_init", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_init, 0,
124 ieee80211_sysctl_inact, "I",
125 "station initial state timeout (sec)");
126 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
127 "driver_caps", CTLFLAG_RW, &ic->ic_caps, 0,
128 "driver capabilities");
129 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
130 "bmiss_max", CTLFLAG_RW, &ic->ic_bmiss_max, 0,
131 "consecutive beacon misses before scanning");
132 ic->ic_sysctl = ctx;
133 }
134
135 void
136 ieee80211_sysctl_detach(struct ieee80211com *ic)
137 {
138
139 if (ic->ic_sysctl != NULL) {
140 sysctl_ctx_free(ic->ic_sysctl);
141 ic->ic_sysctl = NULL;
142 }
143 }
144
145 int
146 ieee80211_node_dectestref(struct ieee80211_node *ni)
147 {
148 /* XXX need equivalent of atomic_dec_and_test */
149 atomic_subtract_int(&ni->ni_refcnt, 1);
150 return atomic_cmpset_int(&ni->ni_refcnt, 0, 1);
151 }
152
153 /*
154 * Allocate and setup a management frame of the specified
155 * size. We return the mbuf and a pointer to the start
156 * of the contiguous data area that's been reserved based
157 * on the packet length. The data area is forced to 32-bit
158 * alignment and the buffer length to a multiple of 4 bytes.
159 * This is done mainly so beacon frames (that require this)
160 * can use this interface too.
161 */
162 struct mbuf *
163 ieee80211_getmgtframe(u_int8_t **frm, u_int pktlen)
164 {
165 struct mbuf *m;
166 u_int len;
167
168 /*
169 * NB: we know the mbuf routines will align the data area
170 * so we don't need to do anything special.
171 */
172 /* XXX 4-address frame? */
173 len = roundup(sizeof(struct ieee80211_frame) + pktlen, 4);
174 KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len));
175 if (len < MINCLSIZE) {
176 m = m_gethdr(M_NOWAIT, MT_HEADER);
177 /*
178 * Align the data in case additional headers are added.
179 * This should only happen when a WEP header is added
180 * which only happens for shared key authentication mgt
181 * frames which all fit in MHLEN.
182 */
183 if (m != NULL)
184 MH_ALIGN(m, len);
185 } else
186 m = m_getcl(M_NOWAIT, MT_HEADER, M_PKTHDR);
187 if (m != NULL) {
188 m->m_data += sizeof(struct ieee80211_frame);
189 *frm = m->m_data;
190 }
191 return m;
192 }
193
194 #include <sys/libkern.h>
195
196 void
197 get_random_bytes(void *p, size_t n)
198 {
199 u_int8_t *dp = p;
200
201 while (n > 0) {
202 u_int32_t v = arc4random();
203 size_t nb = n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n;
204 bcopy(&v, dp, n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n);
205 dp += sizeof(u_int32_t), n -= nb;
206 }
207 }
208
209 void
210 ieee80211_notify_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int newassoc)
211 {
212 struct ifnet *ifp = ic->ic_ifp;
213 struct ieee80211_join_event iev;
214
215 memset(&iev, 0, sizeof(iev));
216 if (ni == ic->ic_bss) {
217 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_bssid);
218 rt_ieee80211msg(ifp, newassoc ?
219 RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC,
220 &iev, sizeof(iev));
221 if_link_state_change(ifp, LINK_STATE_UP);
222 } else {
223 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr);
224 rt_ieee80211msg(ifp, newassoc ?
225 RTM_IEEE80211_JOIN : RTM_IEEE80211_REJOIN,
226 &iev, sizeof(iev));
227 }
228 }
229
230 void
231 ieee80211_notify_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
232 {
233 struct ifnet *ifp = ic->ic_ifp;
234 struct ieee80211_leave_event iev;
235
236 if (ni == ic->ic_bss) {
237 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0);
238 if_link_state_change(ifp, LINK_STATE_DOWN);
239 } else {
240 /* fire off wireless event station leaving */
241 memset(&iev, 0, sizeof(iev));
242 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr);
243 rt_ieee80211msg(ifp, RTM_IEEE80211_LEAVE, &iev, sizeof(iev));
244 }
245 }
246
247 void
248 ieee80211_notify_scan_done(struct ieee80211com *ic)
249 {
250 struct ifnet *ifp = ic->ic_ifp;
251
252 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s\n", "notify scan done");
253
254 /* dispatch wireless event indicating scan completed */
255 rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0);
256 }
257
258 void
259 ieee80211_notify_replay_failure(struct ieee80211com *ic,
260 const struct ieee80211_frame *wh, const struct ieee80211_key *k,
261 u_int64_t rsc)
262 {
263 struct ifnet *ifp = ic->ic_ifp;
264
265 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
266 "[%s] %s replay detected <rsc %ju, csc %ju, keyix %u rxkeyix %u>\n",
267 ether_sprintf(wh->i_addr2), k->wk_cipher->ic_name,
268 (intmax_t) rsc, (intmax_t) k->wk_keyrsc,
269 k->wk_keyix, k->wk_rxkeyix);
270
271 if (ifp != NULL) { /* NB: for cipher test modules */
272 struct ieee80211_replay_event iev;
273
274 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
275 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
276 iev.iev_cipher = k->wk_cipher->ic_cipher;
277 if (k->wk_rxkeyix != IEEE80211_KEYIX_NONE)
278 iev.iev_keyix = k->wk_rxkeyix;
279 else
280 iev.iev_keyix = k->wk_keyix;
281 iev.iev_keyrsc = k->wk_keyrsc;
282 iev.iev_rsc = rsc;
283 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev));
284 }
285 }
286
287 void
288 ieee80211_notify_michael_failure(struct ieee80211com *ic,
289 const struct ieee80211_frame *wh, u_int keyix)
290 {
291 struct ifnet *ifp = ic->ic_ifp;
292
293 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
294 "[%s] michael MIC verification failed <keyix %u>\n",
295 ether_sprintf(wh->i_addr2), keyix);
296 ic->ic_stats.is_rx_tkipmic++;
297
298 if (ifp != NULL) { /* NB: for cipher test modules */
299 struct ieee80211_michael_event iev;
300
301 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
302 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
303 iev.iev_cipher = IEEE80211_CIPHER_TKIP;
304 iev.iev_keyix = keyix;
305 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev));
306 }
307 }
308
309 void
310 ieee80211_load_module(const char *modname)
311 {
312 #ifdef notyet
313 struct thread *td = curthread;
314
315 if (suser(td) == 0 && securelevel_gt(td->td_ucred, 0) == 0) {
316 mtx_lock(&Giant);
317 (void) linker_load_module(modname, NULL, NULL, NULL, NULL);
318 mtx_unlock(&Giant);
319 }
320 #else
321 printf("%s: load the %s module by hand for now.\n", __func__, modname);
322 #endif
323 }
324
325 /*
326 * Module glue.
327 *
328 * NB: the module name is "wlan" for compatibility with NetBSD.
329 */
330 static int
331 wlan_modevent(module_t mod, int type, void *unused)
332 {
333 switch (type) {
334 case MOD_LOAD:
335 if (bootverbose)
336 printf("wlan: <802.11 Link Layer>\n");
337 return 0;
338 case MOD_UNLOAD:
339 return 0;
340 }
341 return EINVAL;
342 }
343
344 static moduledata_t wlan_mod = {
345 "wlan",
346 wlan_modevent,
347 0
348 };
349 DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
350 MODULE_VERSION(wlan, 1);
351 MODULE_DEPEND(wlan, ether, 1, 1, 1);
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