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Aleksa Sarai
d0f2c25f52
In the normal cases (only one existing filter or no existing filters), just make use of BPF_F_REPLACE if there is one existing filter. However if there is more than one filter applied, we should probably remove all other filters since the alternative is that we will never remove our old filters. The only two other viable ways of solving this problem would be to use BPF pins to either pin the eBPF program using a predictable name (so we can always only replace *our* programs) or to switch away from custom programs and instead use eBPF maps (which are pinned) and thus we just update the map conntents to update the ruleset. Unfortunately these both would add a hard requirement of bpffs and would require at least a minor rewrite of the eBPF filtering code -- which is better left for another time. Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>