Hi, A bug was introduced in r254082 that results in BPF taps never being enabled for ieee80211 interfaces that are in monitor mode.
Before r254082, bpf_track() in sys/net80211/ieee80211_freebsd.c was identifying ieee80211 interfaces by checking to see if the value of the ifp->if_start pointer was equal to ieee80211_start. r254082 was a move away from using if_start to using if_transmit in the ieee80211 stack, and bpf_track() was correspondingly updated to check the value of ifp->if_transmit against ieee80211_vap_transmit. The problem is that ifp->if_transmit is set to null_transmit by ieee80211_vap_attach() in sys/net80211/ieee80211.c for interfaces that are in monitor mode (code that has been in place since r195846). One fix that resolves the issue is to use what is likely to be a more stable signature in the check in bpf_track(). A patch against r256155 is attached. -Patrick
ieee80211_bpf_track.patch
Description: Binary data
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