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BPF filter needs to be updated for extended echo #9

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fenner opened this issue Mar 9, 2024 · 0 comments
Open

BPF filter needs to be updated for extended echo #9

fenner opened this issue Mar 9, 2024 · 0 comments

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@fenner
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fenner commented Mar 9, 2024

If the system is using the raw socket (e.g., the user's gid is not inside net.ipv4.ping_group_range), then the filter installed by ping4_install_filter() still expects the return packet to be ICMP_ECHOREPLY, so will not filter out the extended echo replies for a simultaneous ping with a different ident.
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