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/6.3/sys/net80211/ieee80211_freebsd.c 167396 2007-03-10 00:31:03Z 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 void
154 ieee80211_drain_ifq(struct ifqueue *ifq)
155 {
156 struct ieee80211_node *ni;
157 struct mbuf *m;
158
159 for (;;) {
160 IF_DEQUEUE(ifq, m);
161 if (m == NULL)
162 break;
163
164 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
165 KASSERT(ni != NULL, ("frame w/o node"));
166 ieee80211_free_node(ni);
167 m->m_pkthdr.rcvif = NULL;
168
169 m_freem(m);
170 }
171 }
172
173 /*
174 * Allocate and setup a management frame of the specified
175 * size. We return the mbuf and a pointer to the start
176 * of the contiguous data area that's been reserved based
177 * on the packet length. The data area is forced to 32-bit
178 * alignment and the buffer length to a multiple of 4 bytes.
179 * This is done mainly so beacon frames (that require this)
180 * can use this interface too.
181 */
182 struct mbuf *
183 ieee80211_getmgtframe(u_int8_t **frm, u_int pktlen)
184 {
185 struct mbuf *m;
186 u_int len;
187
188 /*
189 * NB: we know the mbuf routines will align the data area
190 * so we don't need to do anything special.
191 */
192 /* XXX 4-address frame? */
193 len = roundup(sizeof(struct ieee80211_frame) + pktlen, 4);
194 KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len));
195 if (len < MINCLSIZE) {
196 m = m_gethdr(M_NOWAIT, MT_HEADER);
197 /*
198 * Align the data in case additional headers are added.
199 * This should only happen when a WEP header is added
200 * which only happens for shared key authentication mgt
201 * frames which all fit in MHLEN.
202 */
203 if (m != NULL)
204 MH_ALIGN(m, len);
205 } else
206 m = m_getcl(M_NOWAIT, MT_HEADER, M_PKTHDR);
207 if (m != NULL) {
208 m->m_data += sizeof(struct ieee80211_frame);
209 *frm = m->m_data;
210 }
211 return m;
212 }
213
214 #include <sys/libkern.h>
215
216 void
217 get_random_bytes(void *p, size_t n)
218 {
219 u_int8_t *dp = p;
220
221 while (n > 0) {
222 u_int32_t v = arc4random();
223 size_t nb = n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n;
224 bcopy(&v, dp, n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n);
225 dp += sizeof(u_int32_t), n -= nb;
226 }
227 }
228
229 void
230 ieee80211_notify_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int newassoc)
231 {
232 struct ifnet *ifp = ic->ic_ifp;
233 struct ieee80211_join_event iev;
234
235 memset(&iev, 0, sizeof(iev));
236 if (ni == ic->ic_bss) {
237 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_bssid);
238 rt_ieee80211msg(ifp, newassoc ?
239 RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC,
240 &iev, sizeof(iev));
241 if_link_state_change(ifp, LINK_STATE_UP);
242 } else {
243 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr);
244 rt_ieee80211msg(ifp, newassoc ?
245 RTM_IEEE80211_JOIN : RTM_IEEE80211_REJOIN,
246 &iev, sizeof(iev));
247 }
248 }
249
250 void
251 ieee80211_notify_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
252 {
253 struct ifnet *ifp = ic->ic_ifp;
254 struct ieee80211_leave_event iev;
255
256 if (ni == ic->ic_bss) {
257 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0);
258 if_link_state_change(ifp, LINK_STATE_DOWN);
259 } else {
260 /* fire off wireless event station leaving */
261 memset(&iev, 0, sizeof(iev));
262 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr);
263 rt_ieee80211msg(ifp, RTM_IEEE80211_LEAVE, &iev, sizeof(iev));
264 }
265 }
266
267 void
268 ieee80211_notify_scan_done(struct ieee80211com *ic)
269 {
270 struct ifnet *ifp = ic->ic_ifp;
271
272 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s\n", "notify scan done");
273
274 /* dispatch wireless event indicating scan completed */
275 rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0);
276 }
277
278 void
279 ieee80211_notify_replay_failure(struct ieee80211com *ic,
280 const struct ieee80211_frame *wh, const struct ieee80211_key *k,
281 u_int64_t rsc)
282 {
283 struct ifnet *ifp = ic->ic_ifp;
284
285 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
286 "[%s] %s replay detected <rsc %ju, csc %ju, keyix %u rxkeyix %u>\n",
287 ether_sprintf(wh->i_addr2), k->wk_cipher->ic_name,
288 (intmax_t) rsc, (intmax_t) k->wk_keyrsc,
289 k->wk_keyix, k->wk_rxkeyix);
290
291 if (ifp != NULL) { /* NB: for cipher test modules */
292 struct ieee80211_replay_event iev;
293
294 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
295 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
296 iev.iev_cipher = k->wk_cipher->ic_cipher;
297 if (k->wk_rxkeyix != IEEE80211_KEYIX_NONE)
298 iev.iev_keyix = k->wk_rxkeyix;
299 else
300 iev.iev_keyix = k->wk_keyix;
301 iev.iev_keyrsc = k->wk_keyrsc;
302 iev.iev_rsc = rsc;
303 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev));
304 }
305 }
306
307 void
308 ieee80211_notify_michael_failure(struct ieee80211com *ic,
309 const struct ieee80211_frame *wh, u_int keyix)
310 {
311 struct ifnet *ifp = ic->ic_ifp;
312
313 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
314 "[%s] michael MIC verification failed <keyix %u>\n",
315 ether_sprintf(wh->i_addr2), keyix);
316 ic->ic_stats.is_rx_tkipmic++;
317
318 if (ifp != NULL) { /* NB: for cipher test modules */
319 struct ieee80211_michael_event iev;
320
321 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
322 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
323 iev.iev_cipher = IEEE80211_CIPHER_TKIP;
324 iev.iev_keyix = keyix;
325 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev));
326 }
327 }
328
329 void
330 ieee80211_load_module(const char *modname)
331 {
332 #ifdef notyet
333 struct thread *td = curthread;
334
335 if (suser(td) == 0 && securelevel_gt(td->td_ucred, 0) == 0) {
336 mtx_lock(&Giant);
337 (void) linker_load_module(modname, NULL, NULL, NULL, NULL);
338 mtx_unlock(&Giant);
339 }
340 #else
341 printf("%s: load the %s module by hand for now.\n", __func__, modname);
342 #endif
343 }
344
345 /*
346 * Module glue.
347 *
348 * NB: the module name is "wlan" for compatibility with NetBSD.
349 */
350 static int
351 wlan_modevent(module_t mod, int type, void *unused)
352 {
353 switch (type) {
354 case MOD_LOAD:
355 if (bootverbose)
356 printf("wlan: <802.11 Link Layer>\n");
357 return 0;
358 case MOD_UNLOAD:
359 return 0;
360 }
361 return EINVAL;
362 }
363
364 static moduledata_t wlan_mod = {
365 "wlan",
366 wlan_modevent,
367 0
368 };
369 DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
370 MODULE_VERSION(wlan, 1);
371 MODULE_DEPEND(wlan, ether, 1, 1, 1);
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