diff options
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -rw-r--r-- | net/ipv4/tcp_input.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index df7b13f0e5e0..2d20edf652e6 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -6699,17 +6699,21 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb) return 0; /* step 5: check the ACK field */ - acceptable = tcp_ack(sk, skb, FLAG_SLOWPATH | - FLAG_UPDATE_TS_RECENT | - FLAG_NO_CHALLENGE_ACK) > 0; + reason = tcp_ack(sk, skb, FLAG_SLOWPATH | + FLAG_UPDATE_TS_RECENT | + FLAG_NO_CHALLENGE_ACK); - if (!acceptable) { + if ((int)reason <= 0) { if (sk->sk_state == TCP_SYN_RECV) return 1; /* send one RST */ - tcp_send_challenge_ack(sk); - SKB_DR_SET(reason, TCP_OLD_ACK); - goto discard; + /* accept old ack during closing */ + if ((int)reason < 0) { + tcp_send_challenge_ack(sk); + reason = -reason; + goto discard; + } } + SKB_DR_SET(reason, NOT_SPECIFIED); switch (sk->sk_state) { case TCP_SYN_RECV: tp->delivered++; /* SYN-ACK delivery isn't tracked in tcp_ack */ |