bpf: Add SO_RCVBUF/SO_SNDBUF in _bpf_getsockopt().

This patch exposes SO_RCVBUF/SO_SNDBUF through bpf_getsockopt().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220104013153.97906-3-kuniyu@amazon.co.jp

diff --git a/net/core/filter.c b/net/core/filter.c
index 368fe28c8dc6e04a61082d49bed116107a5b846e..cac2be559ab03df0a1c480a46465cc22b3279b6a 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4969,6 +4969,12 @@ static int _bpf_getsockopt(struct sock *sk, int level, int optname,
                        goto err_clear;
 
                switch (optname) {
+               case SO_RCVBUF:
+                       *((int *)optval) = sk->sk_rcvbuf;
+                       break;
+               case SO_SNDBUF:
+                       *((int *)optval) = sk->sk_sndbuf;
+                       break;
                case SO_MARK:
                        *((int *)optval) = sk->sk_mark;
                        break;