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selftests/bpf: Fix erroneous bitmask operation

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xdp_synproxy_kern.c is a BPF program that generates SYN cookies on
allowed TCP ports and sends SYNACKs to clients, accelerating synproxy
iptables module.

Fix the bitmask operation when checking the status of an existing
conntrack entry within tcp_lookup() function. Do not AND with the bit
position number, but with the bitmask value to check whether the entry
found has the IPS_CONFIRMED flag set.

Fixes: fb5cd0ce70 ("selftests/bpf: Add selftests for raw syncookie helpers")
Signed-off-by: Jeroen van Ingen Schenau <jeroen.vaningenschenau@novoserve.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Minh Le Hoang <minh.lehoang@novoserve.com>
Link: https://lore.kernel.org/xdp-newbies/CAAi1gX7owA+Tcxq-titC-h-KPM7Ri-6ZhTNMhrnPq5gmYYwKow@mail.gmail.com/T/#u
Link: https://lore.kernel.org/bpf/20231130120353.3084-1-jeroen.vaningenschenau@novoserve.com
This commit is contained in:
Jeroen van Ingen Schenau 2023-11-30 13:03:53 +01:00 committed by Daniel Borkmann
parent 15bc81212f
commit b6a3451e08
1 changed files with 2 additions and 2 deletions
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4
tools/testing/selftests/bpf/progs/xdp_synproxy_kern.c
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@ -467,13 +467,13 @@ static __always_inline int tcp_lookup(void *ctx, struct header_pointers *hdr, bo
unsigned long status = ct->status;
bpf_ct_release(ct);
if (status & IPS_CONFIRMED_BIT)
if (status & IPS_CONFIRMED)
return XDP_PASS;
} else if (ct_lookup_opts.error != -ENOENT) {
return XDP_ABORTED;
}
/* error == -ENOENT || !(status & IPS_CONFIRMED_BIT) */
/* error == -ENOENT || !(status & IPS_CONFIRMED) */
return XDP_TX;
}