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tcp: rstreason: introduce SK_RST_REASON_TCP_STATE for active reset

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Introducing a new type TCP_STATE to handle some reset conditions
appearing in RFC 793 due to its socket state. Actually, we can look
into RFC 9293 which has no discrepancy about this part.

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 18:21:09 +08:00 committed by David S. Miller
parent 8407994f0c
commit edefba66d9
3 changed files with 13 additions and 5 deletions
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6
include/net/rstreason.h
View File

@ -20,6 +20,7 @@
FN(TCP_ABORT_ON_CLOSE) \
FN(TCP_ABORT_ON_LINGER) \
FN(TCP_ABORT_ON_MEMORY) \
FN(TCP_STATE) \
FN(MPTCP_RST_EUNSPEC) \
FN(MPTCP_RST_EMPTCP) \
FN(MPTCP_RST_ERESOURCE) \
@ -102,6 +103,11 @@ enum sk_rst_reason {
* corresponding to LINUX_MIB_TCPABORTONMEMORY
*/
SK_RST_REASON_TCP_ABORT_ON_MEMORY,
/**
* @SK_RST_REASON_TCP_STATE: abort on tcp state
* Please see RFC 9293 for all possible reset conditions
*/
SK_RST_REASON_TCP_STATE,
/* Copy from include/uapi/linux/mptcp.h.
* These reset fields will not be changed since they adhere to

10
net/ipv4/tcp.c
View File

@ -3025,9 +3025,11 @@ int tcp_disconnect(struct sock *sk, int flags)
inet_csk_listen_stop(sk);
} else if (unlikely(tp->repair)) {
WRITE_ONCE(sk->sk_err, ECONNABORTED);
} else if (tcp_need_reset(old_state) ||
(tp->snd_nxt != tp->write_seq &&
(1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) {
} else if (tcp_need_reset(old_state)) {
tcp_send_active_reset(sk, gfp_any(), SK_RST_REASON_TCP_STATE);
WRITE_ONCE(sk->sk_err, ECONNRESET);
} else if (tp->snd_nxt != tp->write_seq &&
(1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) {
/* The last check adjusts for discrepancy of Linux wrt. RFC
* states
*/
@ -4649,7 +4651,7 @@ int tcp_abort(struct sock *sk, int err)
if (!sock_flag(sk, SOCK_DEAD)) {
if (tcp_need_reset(sk->sk_state))
tcp_send_active_reset(sk, GFP_ATOMIC,
SK_RST_REASON_NOT_SPECIFIED);
SK_RST_REASON_TCP_STATE);
tcp_done_with_error(sk, err);
}

2
net/ipv4/tcp_timer.c
View File

@ -779,7 +779,7 @@ static void tcp_keepalive_timer (struct timer_list *t)
goto out;
}
}
tcp_send_active_reset(sk, GFP_ATOMIC, SK_RST_REASON_NOT_SPECIFIED);
tcp_send_active_reset(sk, GFP_ATOMIC, SK_RST_REASON_TCP_STATE);
goto death;
}