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when scanning channels marked passive defer probe request until

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802.11 traffic is seen; fixes problems with ap's hiding their ssid

Obtained from:	atheros
MFC after:	1 week
This commit is contained in:
Sam Leffler 2006-03-06 17:23:26 +00:00
parent 3e3a2a7ddc
commit 097131fffe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=156358
5 changed files with 45 additions and 12 deletions
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12
sys/net80211/ieee80211_input.c
View file

@ -1953,6 +1953,18 @@ ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0,
* If scanning, just pass information to the scan module.
*/
if (ic->ic_flags & IEEE80211_F_SCAN) {
if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
/*
* Actively scanning a channel marked passive;
* send a probe request now that we know there
* is 802.11 traffic present.
*
* XXX check if the beacon we recv'd gives
* us what we need and suppress the probe req
*/
ieee80211_probe_curchan(ic, 1);
ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
}
ieee80211_add_scan(ic, &scan, wh,
subtype, rssi, rstamp);
return;

27
sys/net80211/ieee80211_node.c
View file

@ -321,6 +321,7 @@ ieee80211_next_scan(struct ieee80211com *ic)
* flushing anything queued in the driver and below.
*/
ic->ic_mgt_timer = 0;
ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
chan = ic->ic_curchan;
do {
@ -347,6 +348,31 @@ ieee80211_next_scan(struct ieee80211com *ic)
return 0;
}
/*
* Probe the curent channel, if allowed, while scanning.
* If the channel is not marked passive-only then send
* a probe request immediately. Otherwise mark state and
* listen for beacons on the channel; if we receive something
* then we'll transmit a probe request.
*/
void
ieee80211_probe_curchan(struct ieee80211com *ic, int force)
{
struct ifnet *ifp = ic->ic_ifp;
if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 || force) {
/*
* XXX send both broadcast+directed probe request
*/
ieee80211_send_probereq(ic->ic_bss,
ic->ic_myaddr, ifp->if_broadcastaddr,
ifp->if_broadcastaddr,
ic->ic_des_essid, ic->ic_des_esslen,
ic->ic_opt_ie, ic->ic_opt_ie_len);
} else
ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN;
}
static __inline void
copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
{
@ -596,6 +622,7 @@ ieee80211_cancel_scan(struct ieee80211com *ic)
(ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive");
ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN);
ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
}
/*

1
sys/net80211/ieee80211_node.h
View file

@ -187,6 +187,7 @@ void ieee80211_node_unauthorize(struct ieee80211_node *);
void ieee80211_begin_scan(struct ieee80211com *, int);
int ieee80211_next_scan(struct ieee80211com *);
void ieee80211_probe_curchan(struct ieee80211com *, int);
void ieee80211_create_ibss(struct ieee80211com*, struct ieee80211_channel *);
void ieee80211_reset_bss(struct ieee80211com *);
void ieee80211_cancel_scan(struct ieee80211com *);

16
sys/net80211/ieee80211_proto.c
View file

@ -978,19 +978,11 @@ ieee80211_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int arg
break;
case IEEE80211_S_SCAN:
/*
* Scan next. If doing an active scan and the
* channel is not marked passive-only then send
* a probe request. Otherwise just listen for
* beacons on the channel.
* Scan next. If doing an active scan probe
* for the requested ap (if any).
*/
if ((ic->ic_flags & IEEE80211_F_ASCAN) &&
(ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) {
ieee80211_send_probereq(ni,
ic->ic_myaddr, ifp->if_broadcastaddr,
ifp->if_broadcastaddr,
ic->ic_des_essid, ic->ic_des_esslen,
ic->ic_opt_ie, ic->ic_opt_ie_len);
}
if (ic->ic_flags & IEEE80211_F_ASCAN)
ieee80211_probe_curchan(ic, 0);
break;
case IEEE80211_S_RUN:
/* beacon miss */

1
sys/net80211/ieee80211_var.h
View file

@ -254,6 +254,7 @@ struct ieee80211com {
#define IEEE80211_FEXT_BGSCAN 0x00000008 /* STATUS: enable full bgscan completion */
#define IEEE80211_FEXT_ERPUPDATE 0x00000200 /* STATUS: update ERP element */
#define IEEE80211_FEXT_SWBMISS 0x00000400 /* CONF: do bmiss in s/w */
#define IEEE80211_FEXT_PROBECHAN 0x00020000 /* CONF: probe passive channel*/
/* ic_caps */
#define IEEE80211_C_WEP 0x00000001 /* CAPABILITY: WEP available */