Hi

I tried to limit ping flooding by setting the following rule:

nft add rule filter input icmp type echo-request limit rate 10/second accept

But it doesn't work, I can still ping flood the target.
What I see is that nft_limit_pkts_eval() is called only once at the begining of the flood. After, during do_nft_chain(), regs.verdict.code is changed from -1 to 1 by a call to nft_immediate_eval() earlier in the loop.

How can I investigate that issue ?

Using linux kernel 4.4.21

Christophe


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