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tcp: rstreason: introduce SK_RST_REASON_TCP_DISCONNECT_WITH_DATA for active reset

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When user tries to disconnect a socket and there are more data written
into tcp write queue, we should tell users about this reset reason.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Xing 2024-08-02 18:21:11 +08:00 committed by David S. Miller
parent 0a399892a5
commit c026c6562f
2 changed files with 10 additions and 1 deletions
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8
include/net/rstreason.h
View File

@ -22,6 +22,7 @@
FN(TCP_ABORT_ON_MEMORY) \
FN(TCP_STATE) \
FN(TCP_KEEPALIVE_TIMEOUT) \
FN(TCP_DISCONNECT_WITH_DATA) \
FN(MPTCP_RST_EUNSPEC) \
FN(MPTCP_RST_EMPTCP) \
FN(MPTCP_RST_ERESOURCE) \
@ -115,6 +116,13 @@ enum sk_rst_reason {
* keepalive timeout, we have to reset the connection
*/
SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT,
/**
* @SK_RST_REASON_TCP_DISCONNECT_WITH_DATA: disconnect when write
* queue is not empty
* It means user has written data into the write queue when doing
* disconnecting, so we have to send an RST.
*/
SK_RST_REASON_TCP_DISCONNECT_WITH_DATA,
/* Copy from include/uapi/linux/mptcp.h.
* These reset fields will not be changed since they adhere to

3
net/ipv4/tcp.c
View File

@ -3033,7 +3033,8 @@ int tcp_disconnect(struct sock *sk, int flags)
/* The last check adjusts for discrepancy of Linux wrt. RFC
* states
*/
tcp_send_active_reset(sk, gfp_any(), SK_RST_REASON_NOT_SPECIFIED);
tcp_send_active_reset(sk, gfp_any(),
SK_RST_REASON_TCP_DISCONNECT_WITH_DATA);
WRITE_ONCE(sk->sk_err, ECONNRESET);
} else if (old_state == TCP_SYN_SENT)
WRITE_ONCE(sk->sk_err, ECONNRESET);