ieee80211_freebsd.c revision 159915 
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: head/sys/net80211/ieee80211_freebsd.c 159915 2006-06-24 18:00:17Z 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_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
135void
136ieee80211_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
145int
146ieee80211_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 */
162struct mbuf *
163ieee80211_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_DATA);
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_DATA, 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
196void
197get_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
209void
210ieee80211_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
230void
231ieee80211_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
247void
248ieee80211_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
258void
259ieee80211_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
287void
288ieee80211_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
309void
310ieee80211_load_module(const char *modname)
311{
312
313#ifdef notyet
314	(void)kern_kldload(curthread, modname, NULL);
315#else
316	printf("%s: load the %s module by hand for now.\n", __func__, modname);
317#endif
318}
319
320/*
321 * Module glue.
322 *
323 * NB: the module name is "wlan" for compatibility with NetBSD.
324 */
325static int
326wlan_modevent(module_t mod, int type, void *unused)
327{
328	switch (type) {
329	case MOD_LOAD:
330		if (bootverbose)
331			printf("wlan: <802.11 Link Layer>\n");
332		return 0;
333	case MOD_UNLOAD:
334		return 0;
335	}
336	return EINVAL;
337}
338
339static moduledata_t wlan_mod = {
340	"wlan",
341	wlan_modevent,
342	0
343};
344DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
345MODULE_VERSION(wlan, 1);
346MODULE_DEPEND(wlan, ether, 1, 1, 1);
347