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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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7
net/ipv4/tcp_minisocks.c
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@@ -360,15 +360,12 @@ void tcp_openreq_init_rwin(struct request_sock *req,
{
struct inet_request_sock *ireq = inet_rsk(req);
const struct tcp_sock *tp = tcp_sk(sk_listener);
u16 user_mss = READ_ONCE(tp->rx_opt.user_mss);
int full_space = tcp_full_space(sk_listener);
int mss = dst_metric_advmss(dst);
u32 window_clamp;
__u8 rcv_wscale;
int mss;
if (user_mss && user_mss < mss)
mss = user_mss;
mss = tcp_mss_clamp(tp, dst_metric_advmss(dst));
window_clamp = READ_ONCE(tp->window_clamp);
/* Set this up on the first call only */
req->rsk_window_clamp = window_clamp ? : dst_metric(dst, RTAX_WINDOW);