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bpf: Fix tcp_rwnd_kern.c sample program

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The program was returning -1 in some cases which is not allowed
by the verifier any longer.

Fixes: 390ee7e29f ("bpf: enforce return code for cgroup-bpf programs")
Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lawrence Brakmo
2017-11-10 22:19:51 -08:00
committed by David S. Miller
parent 7863f46bac
commit 016e661bb0
1 changed files with 4 additions and 2 deletions
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6
samples/bpf/tcp_rwnd_kern.c
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@ -38,8 +38,10 @@ int bpf_rwnd(struct bpf_sock_ops *skops)
* if neither port numberis 55601 * if neither port numberis 55601
*/ */
if (bpf_ntohl(skops->remote_port) != if (bpf_ntohl(skops->remote_port) !=
55601 && skops->local_port != 55601) 55601 && skops->local_port != 55601) {
return -1; skops->reply = -1;
return 1;
}
op = (int) skops->op; op = (int) skops->op;