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Refactor tcp_mtudisc 

No functional change.
This commit is contained in:
ozaki-r 2015-09-07 01:56:50 +00:00
parent 6c5982b876
commit cac0e9c370
1 changed files with 31 additions and 29 deletions
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60
sys/netinet/tcp_subr.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: tcp_subr.c,v 1.263 2015/08/24 22:21:26 pooka Exp $ */
/* $NetBSD: tcp_subr.c,v 1.264 2015/09/07 01:56:50 ozaki-r Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -91,7 +91,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tcp_subr.c,v 1.263 2015/08/24 22:21:26 pooka Exp $");
__KERNEL_RCSID(0, "$NetBSD: tcp_subr.c,v 1.264 2015/09/07 01:56:50 ozaki-r Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@ -1768,41 +1768,43 @@ void
tcp_mtudisc(struct inpcb *inp, int errno)
{
struct tcpcb *tp = intotcpcb(inp);
struct rtentry *rt = in_pcbrtentry(inp);
struct rtentry *rt;
if (tp != 0) {
if (rt != 0) {
/*
* If this was not a host route, remove and realloc.
*/
if ((rt->rt_flags & RTF_HOST) == 0) {
in_rtchange(inp, errno);
if ((rt = in_pcbrtentry(inp)) == 0)
return;
}
if (tp == NULL)
return;
/*
* Slow start out of the error condition. We
* use the MTU because we know it's smaller
* than the previously transmitted segment.
*
* Note: This is more conservative than the
* suggestion in draft-floyd-incr-init-win-03.
*/
if (rt->rt_rmx.rmx_mtu != 0)
tp->snd_cwnd =
TCP_INITIAL_WINDOW(tcp_init_win,
rt->rt_rmx.rmx_mtu);
rt = in_pcbrtentry(inp);
if (rt != NULL) {
/*
* If this was not a host route, remove and realloc.
*/
if ((rt->rt_flags & RTF_HOST) == 0) {
in_rtchange(inp, errno);
if ((rt = in_pcbrtentry(inp)) == NULL)
return;
}
/*
* Resend unacknowledged packets.
* Slow start out of the error condition. We
* use the MTU because we know it's smaller
* than the previously transmitted segment.
*
* Note: This is more conservative than the
* suggestion in draft-floyd-incr-init-win-03.
*/
tp->snd_nxt = tp->sack_newdata = tp->snd_una;
tcp_output(tp);
if (rt->rt_rmx.rmx_mtu != 0)
tp->snd_cwnd =
TCP_INITIAL_WINDOW(tcp_init_win,
rt->rt_rmx.rmx_mtu);
}
/*
* Resend unacknowledged packets.
*/
tp->snd_nxt = tp->sack_newdata = tp->snd_una;
tcp_output(tp);
}
#endif
#endif /* INET */
#ifdef INET6
/*