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tcp: avoid spurious SYN flood detection at listen() time 

At listen() time, there is a small window where listener is visible with
a zero backlog, triggering a spurious "Possible SYN flooding on port"
message.

Nothing prevents us from setting the correct backlog.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-14 06:16:49 -07:00 committed by David S. Miller
parent c2f34a65a6
commit f985c65c90
2 changed files with 3 additions and 3 deletions
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2
include/net/inet_connection_sock.h
View File

@ -312,7 +312,7 @@ static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
(POLLIN | POLLRDNORM) : 0;
}
int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
int inet_csk_listen_start(struct sock *sk, int backlog);
void inet_csk_listen_stop(struct sock *sk);
void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);

4
net/ipv4/inet_connection_sock.c
View File

@ -727,14 +727,14 @@ void inet_csk_prepare_forced_close(struct sock *sk)
}
EXPORT_SYMBOL(inet_csk_prepare_forced_close);
int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
int inet_csk_listen_start(struct sock *sk, int backlog)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct inet_sock *inet = inet_sk(sk);
reqsk_queue_alloc(&icsk->icsk_accept_queue);
sk->sk_max_ack_backlog = 0;
sk->sk_max_ack_backlog = backlog;
sk->sk_ack_backlog = 0;
inet_csk_delack_init(sk);