mptcp: Only send extra TCP acks in eligible socket states

[linux-2.6-microblaze.git] / net / core / filter.c

diff --git a/net/core/filter.c b/net/core/filter.c
index cfbd011..2e32cee 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5051,6 +5051,12 @@ err_clear:
 BPF_CALL_5(bpf_sk_setsockopt, struct sock *, sk, int, level,
           int, optname, char *, optval, int, optlen)
 {
+       if (level == SOL_TCP && optname == TCP_CONGESTION) {
+               if (optlen >= sizeof("cdg") - 1 &&
+                   !strncmp("cdg", optval, optlen))
+                       return -ENOTSUPP;
+       }
+
        return _bpf_setsockopt(sk, level, optname, optval, optlen);
 }