ospf_hsend.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 130 行

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1.2
date	97.09.21.19.28.38;	author dls;	state Dist;
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next	1.1;

1.1
date	94.02.06.18.20.47;	author dls;	state Works;
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1.2
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@pre-3e code
@
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@/* ospf_hsend.c - ospf_hsend */

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

/*------------------------------------------------------------------------
 * ospf_hsend - send OSPF hello packet for an interface
 *------------------------------------------------------------------------
 */
int ospf_hsend(ifn)
int	ifn;
{
	struct ospf_if		*pif = &ospf_if[ifn];
	struct ep		*pep, *ospfhtmpl();
	struct ip		*pip;
	struct ospf		*po;
	struct ospf_hello	*poh;
	struct ospf_nb		*pnb;
	int			i, nn, len;

	pep = ospfhtmpl(pif);
	wait(pif->if_nbmutex);
	pip = (struct ip *) pep->ep_data;
	po = (struct ospf *) pip->ip_data;
	poh = (struct ospf_hello *) po->ospf_data;
	pnb = &pif->if_nbtab[1];
	for (i=0, nn=0; i<MAXNBR; ++i, ++pnb)
		if (pnb->nb_state >= NBS_INIT) {
			poh->oh_neighbor[nn++] = pnb->nb_rid;
			po->ospf_len += sizeof(poh->oh_neighbor[0]);
		}
	signal(pif->if_nbmutex);
	poh->oh_netmask = nif[ifn].ni_mask;
	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;	/* all in net order now */
	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 = nif[ifn].ni_ip;
	if (ifn == NI_PRIMARY)
		ipsend(AllSPFRouters, pep, len, IPT_OSPF,
			IPP_INCTL, 1);
	else
		ipsend(nif[ifn].ni_brc, pep, len, IPT_OSPF,
			IPP_INCTL, 1);
}

#if	BYTE_ORDER == LITTLE_ENDIAN
IPaddr AllSPFRouters	= 0x050000E0;	/* 224.0.0.5 */
IPaddr AllDRouters	= 0x060000E0;	/* 224.0.0.6 */
#else	/* BYTE_ORDER == LITTLE_ENDIAN */
IPaddr AllSPFRouters	= 0xE0000005;	/* 224.0.0.5 */
IPaddr AllDRouters	= 0xE0000006;	/* 224.0.0.6 */
#endif	/* BYTE_ORDER == LITTLE_ENDIAN */
@


1.1
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@Initial revision
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@d16 1
a16 1
	struct ep		*pep;
d21 1
a21 1
	int			i, nn;
d23 1
a23 3
	pep = (struct ep *)getbuf(Net.netpool);
	if ((int)pep == SYSERR)
		return SYSERR;
a27 1
	ospfhtmpl(pif, pep);
d35 5
a39 2
	blkcopy(&poh->oh_netmask, nif[ifn].ni_mask, IP_ALEN);
	po->ospf_authtype = pif->if_area->ar_authtype;
d42 1
a42 1
	po->ospf_cksum = cksum(po, po->ospf_len>>1);
d44 1
a44 1
	blkcopy(pip->ip_src, nif[ifn].ni_ip, IP_ALEN);
d46 1
a46 1
		ipsend(AllSPFRouters, pep, po->ospf_len, IPT_OSPF,
d49 1
a49 1
		ipsend(nif[ifn].ni_brc, pep, po->ospf_len, IPT_OSPF,
d53 7
a59 2
IPaddr AllSPFRouters = { 224, 0, 0, 5 };
IPaddr AllDRouters = { 224, 0, 0, 6 };
@