tcplisten.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 91 行

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date	97.09.21.19.29.52;	author dls;	state Dist;
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1.1
date	94.01.14.03.51.20;	author dls;	state v2e1;
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@pre-3e code
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@/* tcplisten.c - tcplisten */

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

/*------------------------------------------------------------------------
 *  tcplisten -  do LISTEN state processing
 *------------------------------------------------------------------------
 */
int tcplisten(ptcb, pep)
struct	tcb	*ptcb;
struct	ep	*pep;
{
	struct	tcb	*newptcb, *tcballoc();
	struct	ip	*pip = (struct ip *)pep->ep_data;
	struct	tcp	*ptcp = (struct tcp *)pip->ip_data;

	if (ptcp->tcp_code & TCPF_RST)
		return OK;		/* "parent" TCB still in LISTEN */
	if ((ptcp->tcp_code & TCPF_ACK) ||
	    (ptcp->tcp_code & TCPF_SYN) == 0)
		return tcpreset(pep);
	newptcb = tcballoc();
	if ((int)newptcb == SYSERR || tcpsync(newptcb) == SYSERR)
		return SYSERR;
	newptcb->tcb_state = TCPS_SYNRCVD;
	newptcb->tcb_ostate = TCPO_IDLE;
	newptcb->tcb_error = 0;
	newptcb->tcb_pptcb = ptcb;			/* for ACCEPT	*/

	newptcb->tcb_rip = pip->ip_src;
	newptcb->tcb_rport = ptcp->tcp_sport;
	newptcb->tcb_lip = pip->ip_dst;
	newptcb->tcb_lport = ptcp->tcp_dport;

	tcpwinit(ptcb, newptcb, pep);	/* initialize window data	*/

	newptcb->tcb_finseq = newptcb->tcb_pushseq = 0;
	newptcb->tcb_flags = TCBF_NEEDOUT;
	TcpPassiveOpens++;
	ptcp->tcp_code &= ~TCPF_FIN;	/* don't process FINs in LISTEN */
	tcpdata(newptcb, pep);
	signal(newptcb->tcb_mutex);
	return OK;
}
@


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@Initial revision
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	blkcopy(newptcb->tcb_rip, pip->ip_src, IP_ALEN);
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	blkcopy(newptcb->tcb_lip, pip->ip_dst, IP_ALEN);
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