1 // SPDX-License-Identifier: GPL-2.0
3 * Some IBSS support code for cfg80211.
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright (C) 2020-2021 Intel Corporation
9 #include <linux/etherdevice.h>
10 #include <linux/if_arp.h>
11 #include <linux/slab.h>
12 #include <linux/export.h>
13 #include <net/cfg80211.h>
14 #include "wext-compat.h"
19 void __cfg80211_ibss_joined(struct net_device
*dev
, const u8
*bssid
,
20 struct ieee80211_channel
*channel
)
22 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
23 struct cfg80211_bss
*bss
;
24 #ifdef CONFIG_CFG80211_WEXT
25 union iwreq_data wrqu
;
28 if (WARN_ON(wdev
->iftype
!= NL80211_IFTYPE_ADHOC
))
34 bss
= cfg80211_get_bss(wdev
->wiphy
, channel
, bssid
, NULL
, 0,
35 IEEE80211_BSS_TYPE_IBSS
, IEEE80211_PRIVACY_ANY
);
40 if (wdev
->current_bss
) {
41 cfg80211_unhold_bss(wdev
->current_bss
);
42 cfg80211_put_bss(wdev
->wiphy
, &wdev
->current_bss
->pub
);
45 cfg80211_hold_bss(bss_from_pub(bss
));
46 wdev
->current_bss
= bss_from_pub(bss
);
48 if (!(wdev
->wiphy
->flags
& WIPHY_FLAG_HAS_STATIC_WEP
))
49 cfg80211_upload_connect_keys(wdev
);
51 nl80211_send_ibss_bssid(wiphy_to_rdev(wdev
->wiphy
), dev
, bssid
,
53 #ifdef CONFIG_CFG80211_WEXT
54 memset(&wrqu
, 0, sizeof(wrqu
));
55 memcpy(wrqu
.ap_addr
.sa_data
, bssid
, ETH_ALEN
);
56 wireless_send_event(dev
, SIOCGIWAP
, &wrqu
, NULL
);
60 void cfg80211_ibss_joined(struct net_device
*dev
, const u8
*bssid
,
61 struct ieee80211_channel
*channel
, gfp_t gfp
)
63 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
64 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wdev
->wiphy
);
65 struct cfg80211_event
*ev
;
68 trace_cfg80211_ibss_joined(dev
, bssid
, channel
);
70 if (WARN_ON(!channel
))
73 ev
= kzalloc(sizeof(*ev
), gfp
);
77 ev
->type
= EVENT_IBSS_JOINED
;
78 memcpy(ev
->ij
.bssid
, bssid
, ETH_ALEN
);
79 ev
->ij
.channel
= channel
;
81 spin_lock_irqsave(&wdev
->event_lock
, flags
);
82 list_add_tail(&ev
->list
, &wdev
->event_list
);
83 spin_unlock_irqrestore(&wdev
->event_lock
, flags
);
84 queue_work(cfg80211_wq
, &rdev
->event_work
);
86 EXPORT_SYMBOL(cfg80211_ibss_joined
);
88 int __cfg80211_join_ibss(struct cfg80211_registered_device
*rdev
,
89 struct net_device
*dev
,
90 struct cfg80211_ibss_params
*params
,
91 struct cfg80211_cached_keys
*connkeys
)
93 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
96 lockdep_assert_held(&rdev
->wiphy
.mtx
);
97 ASSERT_WDEV_LOCK(wdev
);
102 if (!params
->basic_rates
) {
104 * If no rates were explicitly configured,
105 * use the mandatory rate set for 11b or
106 * 11a for maximum compatibility.
108 struct ieee80211_supported_band
*sband
;
109 enum nl80211_band band
;
113 band
= params
->chandef
.chan
->band
;
114 if (band
== NL80211_BAND_5GHZ
||
115 band
== NL80211_BAND_6GHZ
)
116 flag
= IEEE80211_RATE_MANDATORY_A
;
118 flag
= IEEE80211_RATE_MANDATORY_B
;
120 sband
= rdev
->wiphy
.bands
[band
];
121 for (j
= 0; j
< sband
->n_bitrates
; j
++) {
122 if (sband
->bitrates
[j
].flags
& flag
)
123 params
->basic_rates
|= BIT(j
);
127 if (WARN_ON(connkeys
&& connkeys
->def
< 0))
130 if (WARN_ON(wdev
->connect_keys
))
131 kfree_sensitive(wdev
->connect_keys
);
132 wdev
->connect_keys
= connkeys
;
134 wdev
->ibss_fixed
= params
->channel_fixed
;
135 wdev
->ibss_dfs_possible
= params
->userspace_handles_dfs
;
136 wdev
->chandef
= params
->chandef
;
138 params
->wep_keys
= connkeys
->params
;
139 params
->wep_tx_key
= connkeys
->def
;
142 #ifdef CONFIG_CFG80211_WEXT
143 wdev
->wext
.ibss
.chandef
= params
->chandef
;
145 err
= rdev_join_ibss(rdev
, dev
, params
);
147 wdev
->connect_keys
= NULL
;
151 memcpy(wdev
->ssid
, params
->ssid
, params
->ssid_len
);
152 wdev
->ssid_len
= params
->ssid_len
;
157 static void __cfg80211_clear_ibss(struct net_device
*dev
, bool nowext
)
159 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
160 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wdev
->wiphy
);
163 ASSERT_WDEV_LOCK(wdev
);
165 kfree_sensitive(wdev
->connect_keys
);
166 wdev
->connect_keys
= NULL
;
168 rdev_set_qos_map(rdev
, dev
, NULL
);
171 * Delete all the keys ... pairwise keys can't really
172 * exist any more anyway, but default keys might.
174 if (rdev
->ops
->del_key
)
175 for (i
= 0; i
< 6; i
++)
176 rdev_del_key(rdev
, dev
, i
, false, NULL
);
178 if (wdev
->current_bss
) {
179 cfg80211_unhold_bss(wdev
->current_bss
);
180 cfg80211_put_bss(wdev
->wiphy
, &wdev
->current_bss
->pub
);
183 wdev
->current_bss
= NULL
;
185 memset(&wdev
->chandef
, 0, sizeof(wdev
->chandef
));
186 #ifdef CONFIG_CFG80211_WEXT
188 wdev
->wext
.ibss
.ssid_len
= 0;
190 cfg80211_sched_dfs_chan_update(rdev
);
193 void cfg80211_clear_ibss(struct net_device
*dev
, bool nowext
)
195 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
198 __cfg80211_clear_ibss(dev
, nowext
);
202 int __cfg80211_leave_ibss(struct cfg80211_registered_device
*rdev
,
203 struct net_device
*dev
, bool nowext
)
205 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
208 ASSERT_WDEV_LOCK(wdev
);
213 err
= rdev_leave_ibss(rdev
, dev
);
218 wdev
->conn_owner_nlportid
= 0;
219 __cfg80211_clear_ibss(dev
, nowext
);
224 int cfg80211_leave_ibss(struct cfg80211_registered_device
*rdev
,
225 struct net_device
*dev
, bool nowext
)
227 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
231 err
= __cfg80211_leave_ibss(rdev
, dev
, nowext
);
237 #ifdef CONFIG_CFG80211_WEXT
238 int cfg80211_ibss_wext_join(struct cfg80211_registered_device
*rdev
,
239 struct wireless_dev
*wdev
)
241 struct cfg80211_cached_keys
*ck
= NULL
;
242 enum nl80211_band band
;
245 ASSERT_WDEV_LOCK(wdev
);
247 if (!wdev
->wext
.ibss
.beacon_interval
)
248 wdev
->wext
.ibss
.beacon_interval
= 100;
250 /* try to find an IBSS channel if none requested ... */
251 if (!wdev
->wext
.ibss
.chandef
.chan
) {
252 struct ieee80211_channel
*new_chan
= NULL
;
254 for (band
= 0; band
< NUM_NL80211_BANDS
; band
++) {
255 struct ieee80211_supported_band
*sband
;
256 struct ieee80211_channel
*chan
;
258 sband
= rdev
->wiphy
.bands
[band
];
262 for (i
= 0; i
< sband
->n_channels
; i
++) {
263 chan
= &sband
->channels
[i
];
264 if (chan
->flags
& IEEE80211_CHAN_NO_IR
)
266 if (chan
->flags
& IEEE80211_CHAN_DISABLED
)
279 cfg80211_chandef_create(&wdev
->wext
.ibss
.chandef
, new_chan
,
283 /* don't join -- SSID is not there */
284 if (!wdev
->wext
.ibss
.ssid_len
)
287 if (!netif_running(wdev
->netdev
))
291 wdev
->wext
.keys
->def
= wdev
->wext
.default_key
;
293 wdev
->wext
.ibss
.privacy
= wdev
->wext
.default_key
!= -1;
295 if (wdev
->wext
.keys
&& wdev
->wext
.keys
->def
!= -1) {
296 ck
= kmemdup(wdev
->wext
.keys
, sizeof(*ck
), GFP_KERNEL
);
299 for (i
= 0; i
< CFG80211_MAX_WEP_KEYS
; i
++)
300 ck
->params
[i
].key
= ck
->data
[i
];
302 err
= __cfg80211_join_ibss(rdev
, wdev
->netdev
,
303 &wdev
->wext
.ibss
, ck
);
310 int cfg80211_ibss_wext_siwfreq(struct net_device
*dev
,
311 struct iw_request_info
*info
,
312 struct iw_freq
*wextfreq
, char *extra
)
314 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
315 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wdev
->wiphy
);
316 struct ieee80211_channel
*chan
= NULL
;
319 /* call only for ibss! */
320 if (WARN_ON(wdev
->iftype
!= NL80211_IFTYPE_ADHOC
))
323 if (!rdev
->ops
->join_ibss
)
326 freq
= cfg80211_wext_freq(wextfreq
);
331 chan
= ieee80211_get_channel(wdev
->wiphy
, freq
);
334 if (chan
->flags
& IEEE80211_CHAN_NO_IR
||
335 chan
->flags
& IEEE80211_CHAN_DISABLED
)
339 if (wdev
->wext
.ibss
.chandef
.chan
== chan
)
345 err
= __cfg80211_leave_ibss(rdev
, dev
, true);
352 cfg80211_chandef_create(&wdev
->wext
.ibss
.chandef
, chan
,
354 wdev
->wext
.ibss
.channel_fixed
= true;
356 /* cfg80211_ibss_wext_join will pick one if needed */
357 wdev
->wext
.ibss
.channel_fixed
= false;
361 err
= cfg80211_ibss_wext_join(rdev
, wdev
);
367 int cfg80211_ibss_wext_giwfreq(struct net_device
*dev
,
368 struct iw_request_info
*info
,
369 struct iw_freq
*freq
, char *extra
)
371 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
372 struct ieee80211_channel
*chan
= NULL
;
374 /* call only for ibss! */
375 if (WARN_ON(wdev
->iftype
!= NL80211_IFTYPE_ADHOC
))
379 if (wdev
->current_bss
)
380 chan
= wdev
->current_bss
->pub
.channel
;
381 else if (wdev
->wext
.ibss
.chandef
.chan
)
382 chan
= wdev
->wext
.ibss
.chandef
.chan
;
386 freq
->m
= chan
->center_freq
;
391 /* no channel if not joining */
395 int cfg80211_ibss_wext_siwessid(struct net_device
*dev
,
396 struct iw_request_info
*info
,
397 struct iw_point
*data
, char *ssid
)
399 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
400 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wdev
->wiphy
);
401 size_t len
= data
->length
;
404 /* call only for ibss! */
405 if (WARN_ON(wdev
->iftype
!= NL80211_IFTYPE_ADHOC
))
408 if (!rdev
->ops
->join_ibss
)
414 err
= __cfg80211_leave_ibss(rdev
, dev
, true);
420 /* iwconfig uses nul termination in SSID.. */
421 if (len
> 0 && ssid
[len
- 1] == '\0')
424 memcpy(wdev
->ssid
, ssid
, len
);
425 wdev
->wext
.ibss
.ssid
= wdev
->ssid
;
426 wdev
->wext
.ibss
.ssid_len
= len
;
429 err
= cfg80211_ibss_wext_join(rdev
, wdev
);
435 int cfg80211_ibss_wext_giwessid(struct net_device
*dev
,
436 struct iw_request_info
*info
,
437 struct iw_point
*data
, char *ssid
)
439 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
441 /* call only for ibss! */
442 if (WARN_ON(wdev
->iftype
!= NL80211_IFTYPE_ADHOC
))
448 if (wdev
->ssid_len
) {
450 data
->length
= wdev
->ssid_len
;
451 memcpy(ssid
, wdev
->ssid
, data
->length
);
452 } else if (wdev
->wext
.ibss
.ssid
&& wdev
->wext
.ibss
.ssid_len
) {
454 data
->length
= wdev
->wext
.ibss
.ssid_len
;
455 memcpy(ssid
, wdev
->wext
.ibss
.ssid
, data
->length
);
462 int cfg80211_ibss_wext_siwap(struct net_device
*dev
,
463 struct iw_request_info
*info
,
464 struct sockaddr
*ap_addr
, char *extra
)
466 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
467 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wdev
->wiphy
);
468 u8
*bssid
= ap_addr
->sa_data
;
471 /* call only for ibss! */
472 if (WARN_ON(wdev
->iftype
!= NL80211_IFTYPE_ADHOC
))
475 if (!rdev
->ops
->join_ibss
)
478 if (ap_addr
->sa_family
!= ARPHRD_ETHER
)
482 if (is_zero_ether_addr(bssid
) || is_broadcast_ether_addr(bssid
))
485 if (bssid
&& !is_valid_ether_addr(bssid
))
489 if (!bssid
&& !wdev
->wext
.ibss
.bssid
)
492 /* fixed already - and no change */
493 if (wdev
->wext
.ibss
.bssid
&& bssid
&&
494 ether_addr_equal(bssid
, wdev
->wext
.ibss
.bssid
))
500 err
= __cfg80211_leave_ibss(rdev
, dev
, true);
507 memcpy(wdev
->wext
.bssid
, bssid
, ETH_ALEN
);
508 wdev
->wext
.ibss
.bssid
= wdev
->wext
.bssid
;
510 wdev
->wext
.ibss
.bssid
= NULL
;
513 err
= cfg80211_ibss_wext_join(rdev
, wdev
);
519 int cfg80211_ibss_wext_giwap(struct net_device
*dev
,
520 struct iw_request_info
*info
,
521 struct sockaddr
*ap_addr
, char *extra
)
523 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
525 /* call only for ibss! */
526 if (WARN_ON(wdev
->iftype
!= NL80211_IFTYPE_ADHOC
))
529 ap_addr
->sa_family
= ARPHRD_ETHER
;
532 if (wdev
->current_bss
)
533 memcpy(ap_addr
->sa_data
, wdev
->current_bss
->pub
.bssid
, ETH_ALEN
);
534 else if (wdev
->wext
.ibss
.bssid
)
535 memcpy(ap_addr
->sa_data
, wdev
->wext
.ibss
.bssid
, ETH_ALEN
);
537 eth_zero_addr(ap_addr
->sa_data
);