tfcoalesce.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 110 行

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1.2
date	97.09.21.19.29.52;	author dls;	state Dist;
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next	1.1;

1.1
date	94.01.14.03.51.20;	author dls;	state v2e1;
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1.2
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@pre-3e code
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@/* tfcoalesce.c - tfcoalesce */

#include <conf.h>
#include <kernel.h>
#include <network.h>

/*------------------------------------------------------------------------
 *  tfcoalesce -  join TCP fragments
 *------------------------------------------------------------------------
 */
int tfcoalesce(ptcb, datalen, ptcp)
struct	tcb	*ptcb;
int		datalen;
struct	tcp	*ptcp;
{
	struct tcpfrag	*tf = 0;
	int	new;

	ptcb->tcb_rnext += datalen;
	ptcb->tcb_rbcount += datalen;
	if (ptcb->tcb_rnext == ptcb->tcb_finseq)
		goto alldone;
	if ((ptcb->tcb_rnext - ptcb->tcb_pushseq) >= 0) {
		ptcp->tcp_code |= TCPF_PSH;
		ptcb->tcb_pushseq = 0;
	}
	if (ptcb->tcb_rsegq < 0)	/* see if this closed a hole */
		return OK;
	tf = (struct tcpfrag *)deq(ptcb->tcb_rsegq);
	if (tf == 0)
		return OK;
	while ((tf->tf_seq - ptcb->tcb_rnext) <= 0) {
		new = tf->tf_len - (ptcb->tcb_rnext - tf->tf_seq);
		if (new > 0) {
			ptcb->tcb_rnext += new;
			ptcb->tcb_rbcount += new;
		}
		if (ptcb->tcb_rnext == ptcb->tcb_finseq)
			goto alldone;
		if ((ptcb->tcb_rnext - ptcb->tcb_pushseq) >= 0) {
			ptcp->tcp_code |= TCPF_PSH;
			ptcb->tcb_pushseq = 0;
		}
		freemem(tf, sizeof(struct tcpfrag));
		tf = (struct tcpfrag *)deq(ptcb->tcb_rsegq);
		if (tf == 0) {
			freeq(ptcb->tcb_rsegq);
			ptcb->tcb_rsegq = EMPTY;
			return OK;
		}
	}
	enq(ptcb->tcb_rsegq, tf, -tf->tf_seq); /* got one too many	*/
	return OK;
alldone:
	if (tf)
		freemem(tf, sizeof(struct tcpfrag));
	while (tf = (struct tcpfrag *)deq(ptcb->tcb_rsegq))
		freemem(tf, sizeof(struct tcpfrag));
	freeq(ptcb->tcb_rsegq);
	ptcb->tcb_rsegq = EMPTY;
	ptcp->tcp_code |= TCPF_FIN;
	return OK;
}
@


1.1
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@Initial revision
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@d16 1
a16 1
	struct tcpfrag	*tf;
d30 2
d55 3
a57 1
	do
a58 1
	while (tf = (struct tcpfrag *)deq(ptcb->tcb_rsegq));
@