ni_in.c

TCP-IP红宝书源代码

/* ni_in.c - ni_in */

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

#include <ospf.h>

int arp_in(struct netif *, struct ep *);
int rarp_in(struct netif *, struct ep *);
int ip_in(struct netif *, struct ep *);

/*------------------------------------------------------------------------
 *  ni_in - network interface input function
 *------------------------------------------------------------------------
 */
int
ni_in(struct netif *pni, struct ep *pep, unsigned len)
{
	int	rv;

	pep->ep_ifn = pni - &nif[0];	/* record originating intf # */

	pni->ni_ioctets += len;
	if (!memcmp(pni->ni_hwa.ha_addr, pep->ep_dst, EP_ALEN))
		pni->ni_iucast++;
	else
		pni->ni_inucast++;
	switch (pep->ep_type) {
	case EPT_ARP:	rv = arp_in(pni, pep);	break;
	case EPT_RARP:	rv = rarp_in(pni, pep);	break;
	case EPT_IP:	rv = ip_in(pni, pep);	break;
	default:
		pni->ni_iunkproto++;
		freebuf(pep);
		rv = OK;
	}
	return rv;
}