Andreas Fenkart
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QNX / libpcap / wpa_supplicant -- packet loss
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Andreas Fenkart
10/01/2010 8:35 AM
post69244
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QNX / libpcap / wpa_supplicant -- packet loss
Hi
I observed a problem, when bpf queues 3 packages for
wpa_supplicant. Only the first package is received, then
wpa_supplicant blocks in select without reading the other 2
packages.
The is what I debugged so far:
wpa_supplicant io-pkt
------------------------------------------------------
select:
- - - - | -> bpf_poll
<- - - - | - <data available
-> pcap_next " |
-> pcap_dispatch |
-> pcap_read_bpf |
- - - | -> bpf_read
<- - - | - <pass all queued data>
--> libpcap extracts 1 packet queues remaining data <--
<- 1 packet
<- 1 packet
..
process packet
..
do select:
- - - - | -> bpf_poll
<- - - - | - <no data available
repeat
The problem is that the data is queued in pcap, but the
supplicant checking this before calling 'select' again. Select
will fail, since it checks for available data in io-pkt which in
my case has none.
Any suggestions, hints to existing patches very welcome.
kind regards
Andreas
---- configuration --------------------------------------------
QNX 6.4.1 / wpa_supplicant 0.6.4 / libpcap 0.9.8
network={
ssid="MotorolaWPA-EAP"
scan_ssid=1
# IEEE 802.1X (i.e., no WPA) with dynamic WEP keys
key_mgmt=IEEE8021X
eap=TTLS
identity="xxxx"
password="xxxx"
priority=1
}
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