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tcp: add tcp_mss_clamp() helper

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Small cleanup factorizing code doing the TCP_MAXSEG clamping.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-02-02 08:04:56 -08:00 • committed by David S. Miller
parent ff3edc9b8e
commit 3541f9e8bd
5 changed files with 17 additions and 23 deletions
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9
include/linux/tcp.h
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@ -445,4 +445,13 @@ static inline void tcp_saved_syn_free(struct tcp_sock *tp)
struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk);
static inline u16 tcp_mss_clamp(const struct tcp_sock *tp, u16 mss)
{
/* We use READ_ONCE() here because socket might not be locked.
* This happens for listeners.
*/
u16 user_mss = READ_ONCE(tp->rx_opt.user_mss);
return (user_mss && user_mss < mss) ? user_mss : mss;
}
#endif /* _LINUX_TCP_H */