Commit dbf650b6 authored Oct 20, 2015 by Eric Dumazet Committed by David S. Miller Oct 22, 2015

tcp: fastopen: limit max_qlen

Allowing an application to set whatever limit for
the list of recently RST fastopen sessions [1] is not wise,
as it open ways to deplete kernel memory.

Cap the user provided limit by somaxconn sysctl,
like listen() backlog.

[1] https://tools.ietf.org/html/rfc7413#section-5.1



Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent e2aacd96

include/linux/tcp.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -392,8 +392,9 @@ static inline bool tcp_passive_fastopen(const struct sock *sk)
		static inline void fastopen_queue_tune(struct sock *sk, int backlog)
		{
		struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
		int somaxconn = READ_ONCE(sock_net(sk)->core.sysctl_somaxconn);

		queue->fastopenq.max_qlen = backlog;
		queue->fastopenq.max_qlen = min_t(unsigned int, backlog, somaxconn);
		}

		static inline void tcp_saved_syn_free(struct tcp_sock *tp)