ieee80211_freebsd.c revision 138609 
1/*-
2 * Copyright (c) 2003-2004 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: head/sys/net80211/ieee80211_freebsd.c 138609 2004-12-08 22:34:07Z 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
52SYSCTL_NODE(_net, OID_AUTO, wlan, CTLFLAG_RD, 0, "IEEE 80211 parameters");
53
54#ifdef IEEE80211_DEBUG
55int	ieee80211_debug = 0;
56SYSCTL_INT(_net_wlan, OID_AUTO, debug, CTLFLAG_RW, &ieee80211_debug,
57	    0, "debugging printfs");
58#endif
59
60static int
61ieee80211_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
73static int
74ieee80211_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
82void
83ieee80211_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", 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	ic->ic_sysctl = ctx;
127}
128
129void
130ieee80211_sysctl_detach(struct ieee80211com *ic)
131{
132
133	if (ic->ic_sysctl != NULL) {
134		sysctl_ctx_free(ic->ic_sysctl);
135		ic->ic_sysctl = NULL;
136	}
137}
138
139int
140ieee80211_node_dectestref(struct ieee80211_node *ni)
141{
142	/* XXX need equivalent of atomic_dec_and_test */
143	atomic_subtract_int(&ni->ni_refcnt, 1);
144	return atomic_cmpset_int(&ni->ni_refcnt, 0, 1);
145}
146
147/*
148 * Allocate and setup a management frame of the specified
149 * size.  We return the mbuf and a pointer to the start
150 * of the contiguous data area that's been reserved based
151 * on the packet length.  The data area is forced to 32-bit
152 * alignment and the buffer length to a multiple of 4 bytes.
153 * This is done mainly so beacon frames (that require this)
154 * can use this interface too.
155 */
156struct mbuf *
157ieee80211_getmgtframe(u_int8_t **frm, u_int pktlen)
158{
159	struct mbuf *m;
160	u_int len;
161
162	/*
163	 * NB: we know the mbuf routines will align the data area
164	 *     so we don't need to do anything special.
165	 */
166	/* XXX 4-address frame? */
167	len = roundup(sizeof(struct ieee80211_frame) + pktlen, 4);
168	KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len));
169	if (len < MINCLSIZE) {
170		m = m_gethdr(M_NOWAIT, MT_HEADER);
171		/*
172		 * Align the data in case additional headers are added.
173		 * This should only happen when a WEP header is added
174		 * which only happens for shared key authentication mgt
175		 * frames which all fit in MHLEN.
176		 */
177		if (m != NULL)
178			MH_ALIGN(m, len);
179	} else
180		m = m_getcl(M_NOWAIT, MT_HEADER, M_PKTHDR);
181	if (m != NULL) {
182		m->m_data += sizeof(struct ieee80211_frame);
183		*frm = m->m_data;
184	}
185	return m;
186}
187
188#include <sys/libkern.h>
189
190void
191get_random_bytes(void *p, size_t n)
192{
193	u_int8_t *dp = p;
194
195	while (n > 0) {
196		u_int32_t v = arc4random();
197		size_t nb = n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n;
198		bcopy(&v, dp, n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n);
199		dp += sizeof(u_int32_t), n -= nb;
200	}
201}
202
203void
204ieee80211_notify_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int newassoc)
205{
206	struct ifnet *ifp = ic->ic_ifp;
207	struct ieee80211_join_event iev;
208
209	if (ni == ic->ic_bss) {
210		memset(&iev, 0, sizeof(iev));
211		IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_bssid);
212		rt_ieee80211msg(ifp, newassoc ?
213			RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC,
214			&iev, sizeof(iev));
215		if_link_state_change(ifp, LINK_STATE_UP);
216	} else if (newassoc) {
217		/* fire off wireless event only for new station */
218		memset(&iev, 0, sizeof(iev));
219		IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr);
220		rt_ieee80211msg(ifp, RTM_IEEE80211_JOIN, &iev, sizeof(iev));
221	}
222}
223
224void
225ieee80211_notify_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
226{
227	struct ifnet *ifp = ic->ic_ifp;
228	struct ieee80211_leave_event iev;
229
230	if (ni == ic->ic_bss) {
231		rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0);
232		if_link_state_change(ifp, LINK_STATE_DOWN);
233	} else {
234		/* fire off wireless event station leaving */
235		memset(&iev, 0, sizeof(iev));
236		IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr);
237		rt_ieee80211msg(ifp, RTM_IEEE80211_LEAVE, &iev, sizeof(iev));
238	}
239}
240
241void
242ieee80211_notify_scan_done(struct ieee80211com *ic)
243{
244	struct ifnet *ifp = ic->ic_ifp;
245
246	IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
247		"%s: notify scan done\n", ic->ic_ifp->if_xname);
248
249	/* dispatch wireless event indicating scan completed */
250	rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0);
251}
252
253void
254ieee80211_notify_replay_failure(struct ieee80211com *ic,
255	const struct ieee80211_frame *wh, const struct ieee80211_key *k,
256	u_int64_t rsc)
257{
258	struct ifnet *ifp = ic->ic_ifp;
259
260	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
261		"[%s] %s replay detected <rsc %ju, csc %ju>\n",
262		ether_sprintf(wh->i_addr2), k->wk_cipher->ic_name,
263		(intmax_t) rsc, (intmax_t) k->wk_keyrsc);
264
265	if (ifp != NULL) {		/* NB: for cipher test modules */
266		struct ieee80211_replay_event iev;
267
268		IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
269		IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
270		iev.iev_cipher = k->wk_cipher->ic_cipher;
271		iev.iev_keyix = k->wk_keyix;
272		iev.iev_keyrsc = k->wk_keyrsc;
273		iev.iev_rsc = rsc;
274		rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev));
275	}
276}
277
278void
279ieee80211_notify_michael_failure(struct ieee80211com *ic,
280	const struct ieee80211_frame *wh, u_int keyix)
281{
282	struct ifnet *ifp = ic->ic_ifp;
283
284	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
285		"[%s] Michael MIC verification failed <keyidx %d>\n",
286	       ether_sprintf(wh->i_addr2), keyix);
287	ic->ic_stats.is_rx_tkipmic++;
288
289	if (ifp != NULL) {		/* NB: for cipher test modules */
290		struct ieee80211_michael_event iev;
291
292		IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
293		IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
294		iev.iev_cipher = IEEE80211_CIPHER_TKIP;
295		iev.iev_keyix = keyix;
296		rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev));
297	}
298}
299
300void
301ieee80211_load_module(const char *modname)
302{
303	struct thread *td = curthread;
304
305	if (suser(td) == 0 && securelevel_gt(td->td_ucred, 0) == 0) {
306		mtx_lock(&Giant);
307		(void) linker_load_module(modname, NULL, NULL, NULL, NULL);
308		mtx_unlock(&Giant);
309	}
310}
311
312/*
313 * Module glue.
314 *
315 * NB: the module name is "wlan" for compatibility with NetBSD.
316 */
317static int
318wlan_modevent(module_t mod, int type, void *unused)
319{
320	switch (type) {
321	case MOD_LOAD:
322		if (bootverbose)
323			printf("wlan: <802.11 Link Layer>\n");
324		return 0;
325	case MOD_UNLOAD:
326		return 0;
327	}
328	return EINVAL;
329}
330
331static moduledata_t wlan_mod = {
332	"wlan",
333	wlan_modevent,
334	0
335};
336DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
337MODULE_VERSION(wlan, 1);
338MODULE_DEPEND(wlan, ether, 1, 1, 1);
339