Support bpf_getsockopt if application tries to know what the RTO MIN
of this socket is.
Signed-off-by: Jason Xing <kerneljasonxing@xxxxxxxxx>
---
net/core/filter.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/net/core/filter.c b/net/core/filter.c
index a0867c5b32b3..31aef259e104 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5415,6 +5415,17 @@ static int sol_tcp_sockopt(struct sock *sk, int optname,
if (*optlen < 1)
return -EINVAL;
break;
+ case TCP_BPF_RTO_MIN:
+ if (*optlen != sizeof(int))
+ return -EINVAL;
+ if (getopt) {
+ int rto_min = inet_csk(sk)->icsk_rto_min;
+ int rto_min_us = jiffies_to_usecs(rto_min);
+
+ memcpy(optval, &rto_min_us, *optlen);
+ return 0;
+ }
+ return bpf_sol_tcp_setsockopt(sk, optname, optval, *optlen);
case TCP_BPF_SOCK_OPS_CB_FLAGS:
if (*optlen != sizeof(int))
return -EINVAL;
--
2.43.5
