From: Jason Xing <kerneljasonxing@gmail.com>
Date: Wed, 12 Mar 2025 15:35:21 +0000 (+0100)
Subject: tcp: bpf: Support bpf_getsockopt for TCP_BPF_RTO_MIN
X-Git-Tag: v6.15-rc1~160^2~70^2^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5584cd7e0ddd0d4e6e91498864c4cd025445dafe;p=thirdparty%2Flinux.git

tcp: bpf: Support bpf_getsockopt for TCP_BPF_RTO_MIN

Support bpf_getsockopt if application tries to know what the RTO MIN
of this socket is.

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250312153523.9860-3-kerneljasonxing@gmail.com
---

diff --git a/net/core/filter.c b/net/core/filter.c
index 2932de5cc57ce..4d34d35af5c78 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5295,6 +5295,12 @@ static int bpf_sol_tcp_getsockopt(struct sock *sk, int optname,
 		memcpy(optval, &cb_flags, optlen);
 		break;
 	}
+	case TCP_BPF_RTO_MIN: {
+		int rto_min_us = jiffies_to_usecs(inet_csk(sk)->icsk_rto_min);
+
+		memcpy(optval, &rto_min_us, optlen);
+		break;
+	}
 	default:
 		return -EINVAL;
 	}