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| author | Jason Xing <kernelxing@tencent.com> | 2024-05-10 15:25:02 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-05-14 03:33:57 +0300 |
| commit | 11f46ea9814d2f0a3c7a5bc749d7619e47251f75 (patch) | |
| tree | 8373b47f89ab0ff45b96e50fa17f4db5e078aaf0 /net | |
| parent | 22a32557758a7100e46dfa8f383a401125e60b16 (diff) | |
| download | linux-11f46ea9814d2f0a3c7a5bc749d7619e47251f75.tar.xz | |
tcp: rstreason: fully support in tcp_check_req()
We're going to send an RST due to invalid syn packet which is already
checked whether 1) it is in sequence, 2) it is a retransmitted skb.
As RFC 793 says, if the state of socket is not CLOSED/LISTEN/SYN-SENT,
then we should send an RST when receiving bad syn packet:
"fourth, check the SYN bit,...If the SYN is in the window it is an
error, send a reset"
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Link: https://lore.kernel.org/r/20240510122502.27850-6-kerneljasonxing@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_minisocks.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 7d543569a180..b93619b2384b 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -879,7 +879,7 @@ embryonic_reset: * avoid becoming vulnerable to outside attack aiming at * resetting legit local connections. */ - req->rsk_ops->send_reset(sk, skb, SK_RST_REASON_NOT_SPECIFIED); + req->rsk_ops->send_reset(sk, skb, SK_RST_REASON_INVALID_SYN); } else if (fastopen) { /* received a valid RST pkt */ reqsk_fastopen_remove(sk, req, true); tcp_reset(sk, skb); |