FS#3045 - In kernel WiFi pcap filters filter too much #7816
Labels
flyspray
kernel
pull request/issue with Linux kernel related changes
release/19.07
pull request/issue targeted (also) for OpenWrt 19.07 release
RedDwarf:
In an Archer C7 just flashed with https://downloads.openwrt.org/releases/19.07.2/targets/ath79/generic/openwrt-19.07.2-ath79-generic-tplink_archer-c7-v2-squashfs-factory.bin (also with a custom build of the HEAD of the openwrt-19.07 branch) I find that "tcpdump -i wlan1 | grep Beacon" shows a lot of packets but "tcpdump -i wlan1 'type mgt subtype beacon'" doesn't show anything (a packet from time to time, but very rarely and way less than without the filter). Doing the same after patching libpcap to force it to do the filtering in user-space fixes the issue.
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