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The additional checks involving sequence numbers in MTU discovery resends

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turned out not to be necessary; simply watching for MTU decreases (which
we already did) automagically eliminates all the cases we were trying to
protect against.
This commit is contained in:
Garrett Wollman 1995-10-12 17:37:25 +00:00
parent eb034ce46a
commit 3abc79d2ee
3 changed files with 11 additions and 17 deletions
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12
sys/netinet/tcp_subr.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
* $Id: tcp_subr.c,v 1.17 1995/10/03 16:54:15 wollman Exp $
* $Id: tcp_subr.c,v 1.18 1995/10/10 17:45:40 wollman Exp $
*/
#include <sys/param.h>
@ -525,12 +525,10 @@ tcp_mtudisc(inp, errno)
tp->t_maxseg = mss;
if (SEQ_GT(tp->snd_una, tp->t_lastmturesend)) {
tcpstat.tcps_mturesent++;
tp->t_rtt = 0;
tp->snd_nxt = tp->t_lastmturesend = tp->snd_una;
tcp_output(tp);
}
tcpstat.tcps_mturesent++;
tp->t_rtt = 0;
tp->snd_nxt = tp->snd_una;
tcp_output(tp);
}
}
#endif /* MTUDISC */

12
sys/netinet/tcp_timewait.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
* $Id: tcp_subr.c,v 1.17 1995/10/03 16:54:15 wollman Exp $
* $Id: tcp_subr.c,v 1.18 1995/10/10 17:45:40 wollman Exp $
*/
#include <sys/param.h>
@ -525,12 +525,10 @@ tcp_mtudisc(inp, errno)
tp->t_maxseg = mss;
if (SEQ_GT(tp->snd_una, tp->t_lastmturesend)) {
tcpstat.tcps_mturesent++;
tp->t_rtt = 0;
tp->snd_nxt = tp->t_lastmturesend = tp->snd_una;
tcp_output(tp);
}
tcpstat.tcps_mturesent++;
tp->t_rtt = 0;
tp->snd_nxt = tp->snd_una;
tcp_output(tp);
}
}
#endif /* MTUDISC */

4
sys/netinet/tcp_var.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
* $Id: tcp_var.h,v 1.18 1995/10/04 20:49:03 wollman Exp $
* $Id: tcp_var.h,v 1.19 1995/10/10 17:45:43 wollman Exp $
*/
#ifndef _NETINET_TCP_VAR_H_
@ -141,8 +141,6 @@ struct tcpcb {
caddr_t t_tuba_pcb; /* next level down pcb for TCP over z */
/* More RTT stuff */
u_long t_rttupdated; /* number of times rtt sampled */
/* For MTU discovery */
tcp_seq t_lastmturesend; /* seq of resend for mtu discovery */
};
/*