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tcp: fastopen: limit max_qlen

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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>
This commit is contained in:
Eric Dumazet 2015-10-20 13:17:40 -07:00 committed by David S. Miller
parent e2aacd963a
commit dbf650b67b
1 changed files with 2 additions and 1 deletions
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3
include/linux/tcp.h
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@ -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) static inline void fastopen_queue_tune(struct sock *sk, int backlog)
{ {
struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; 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) static inline void tcp_saved_syn_free(struct tcp_sock *tp)