dd_xmit.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 170 行

head	1.4;
access;
symbols;
locks
	dls:1.4; strict;
comment	@ * @;


1.4
date	97.09.21.19.28.38;	author dls;	state Dist;
branches;
next	1.3;

1.3
date	94.02.20.18.59.56;	author dls;	state Works;
branches;
next	1.2;

1.2
date	94.02.13.19.38.53;	author dls;	state Works;
branches;
next	1.1;

1.1
date	94.02.06.18.20.12;	author dls;	state Ok;
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next	;


desc
@@


1.4
log
@pre-3e code
@
text
@/* dd_xmit.c - dd_xmit */

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

/*------------------------------------------------------------------------
 *  dd_xmit - transmit pending Database Description packets
 *------------------------------------------------------------------------
 */
int dd_xmit(pif, pnb)
struct ospf_if	*pif;
struct ospf_nb	*pnb;
{
	struct	ep	*pephead, *pep, *ospfddtmpl();
	struct	ip	*pip;
	struct	ospf	*po;
	struct	ospf_dd	*pdd;
	int		len;

	if (pephead = (struct ep *)headq(pnb->nb_dsl)) {
kprintf("dd_xmit: queue not empty\n");
		pep = (struct ep *)getbuf(Net.netpool);
		if ((int)pep == SYSERR)
			return SYSERR;
		/* make a copy */
		pip = (struct ip *)pephead->ep_data;
		po = (struct ospf *)pip->ip_data;
		len = EP_HLEN + IPMHLEN + po->ospf_len;
		blkcopy(pep, pephead, len);
		pip = (struct ip *)pep->ep_data;
		po = (struct ospf *)pip->ip_data;
		pdd = (struct ospf_dd *)po->ospf_data;
	} else {
kprintf("dd_xmit: queue empty\n");
		/* no DD's to send; create an ACK-only */
		pep = ospfddtmpl(pif);
		pip = (struct ip *)pep->ep_data;
		po = (struct ospf *)pip->ip_data;
		pdd = (struct ospf_dd *)po->ospf_data;
		if (pnb->nb_master)
			pdd->dd_control = DDC_MSTR;
		else
			pdd->dd_control = 0;
	}
	pdd->dd_seq = hl2net(pnb->nb_seq);
	po->ospf_authtype = net2hs(pif->if_area->ar_authtype);
	len = po->ospf_len;
	po->ospf_len = net2hs(po->ospf_len);
	pep->ep_order &= ~EPO_OSPF;
	bzero(po->ospf_auth, AUTHLEN);
	po->ospf_cksum = 0;
	po->ospf_cksum = cksum(po, len);
	blkcopy(po->ospf_auth, pif->if_area->ar_auth, AUTHLEN);
	pip->ip_src = ip_anyaddr;
	ipsend(pnb->nb_ipa, pep, len, IPT_OSPF, IPP_INCTL, IP_TTL);
}
@


1.3
log
@*** empty log message ***
@
text
@d16 1
a16 1
	struct	ep	*pephead, *pep;
a21 2
kprintf("dd_xmit\n");

d23 1
d36 1
d47 5
a51 2
	pdd->dd_seq = pnb->nb_seq;
	po->ospf_authtype = pif->if_area->ar_authtype;
d54 1
a54 1
	po->ospf_cksum = cksum(po, po->ospf_len>>1);
d56 2
a57 4
	blkcopy(pip->ip_src, ip_anyaddr, IP_ALEN);
kprintf("dd_xmit calling ipsend:\n");
	ipsend(pnb->nb_ipa, pep, po->ospf_len, IPT_OSPF, IPP_INCTL,
		IP_TTL);
@


1.2
log
@*** empty log message ***
@
text
@a23 3
	pep = (struct ep *)getbuf(Net.netpool);
	if ((int)pep == SYSERR)
		return SYSERR;
d25 3
d38 1
a38 1
		ospfddtmpl(pif, pep);
@


1.1
log
@Initial revision
@
text
@a23 5
	pephead = (struct ep *)deq(pnb->nb_dsl);
	if (pephead == 0) {
/* generate an event here? */
		return;
	}
d27 21
a47 10
	/* make a copy */
	pip = (struct ip *)pephead->ep_data;
	po = (struct ospf *)pip->ip_data;
	len = EP_HLEN + IPMHLEN + po->ospf_len;
	blkcopy(pep, pephead, len);
	pip = (struct ip *)pep->ep_data;
	po = (struct ospf *)pip->ip_data;

	if (enq(pnb->nb_dsl, pephead, -pdd->dd_seq) < 0)
		freebuf(pephead);
d54 1
@