netdev - [PATCH bpf v2 3/4] bpf: Use EOPNOTSUPP in bpf_tcp_check

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Date:   Mon, 24 Jan 2022 17:11:45 +0200
From:   Maxim Mikityanskiy <maximmi@...dia.com>
To:     <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, <netdev@...r.kernel.org>
CC:     Tariq Toukan <tariqt@...dia.com>, Martin KaFai Lau <kafai@...com>,
        "Song Liu" <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Petar Penkov <ppenkov@...gle.com>,
        Lorenz Bauer <lmb@...udflare.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>
Subject: [PATCH bpf v2 3/4] bpf: Use EOPNOTSUPP in bpf_tcp_check_syncookie

When CONFIG_SYN_COOKIES is off, bpf_tcp_check_syncookie returns
ENOTSUPP. It's a non-standard and deprecated code. The related function
bpf_tcp_gen_syncookie and most of the other functions use EOPNOTSUPP if
some feature is not available. This patch changes ENOTSUPP to EOPNOTSUPP
in bpf_tcp_check_syncookie.

Fixes: 399040847084 ("bpf: add helper to check for a valid SYN cookie")
Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
---
 net/core/filter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 780e635fb52a..2c9106704821 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6814,7 +6814,7 @@ BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len
 
 	return -ENOENT;
 #else
-	return -ENOTSUPP;
+	return -EOPNOTSUPP;
 #endif
 }
 
-- 
2.30.2