OpenWRT: BPF is broken (master branch has received a fix)

[ZerBea]

After an update to latest git head of 24.10 branch (as of today), I noticed that the BPF handling is broken.

You'll get this ERROR if yo try to attach a BPF:

$ hcxdumptool -i rogue1 --bpf=/root/filter/own_ext.bpf
failed to attach BPF (SO_ATTACH_FILTER): No error information
failed to open raw packet socket

1 ERROR(s) during runtime (mostly caused by a broken driver)
0 Packet(s) captured by kernel
0 Packet(s) dropped by kernel
exit on error

My latest working git head is of 14th of June 2025!

[ZerBea]

I bisected the master branch of OpenWRT and identified the faulty commit:
openwrt/openwrt#19405

Do not pull OpenWRT git head after 14th of June until this is fixed!

[strasharo]

Fyi for the others, the last commit prior the faulty one is bbd95c0523174dc724a40b4d2483cadf7dc9907c

[ZerBea]

OpenWRT master branch has received a fix:
openwrt/openwrt@20d761c

Everything is working as expected:

BusyBox v1.37.0 (2025-09-10 04:34:58 UTC) built-in shell (ash)

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 OpenWrt SNAPSHOT, r31015-20d761cf19
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