bpf: add bpf_tcp_gen_syncookie helper

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This helper function allows BPF programs to try to generate SYN
cookies, given a reference to a listener socket. The function works
from XDP and with an skb context since bpf_skc_lookup_tcp can lookup a
socket in both cases.

Signed-off-by: Petar Penkov <ppenkov@google.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Petar Penkov 2019-07-29 09:59:15 -07:00 • committed by Alexei Starovoitov

parent 9349d600fb

commit 70d6624431

2 changed files with 102 additions and 1 deletions

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30

include/uapi/linux/bpf.h

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73

net/core/filter.c

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