ipdstopts.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 58 行

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date	97.09.21.19.27.09;	author dls;	state Dist;
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@/* ipdstopts.c - ipdstopts */

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

/*------------------------------------------------------------------------
 *  ipdstopts - do host handling of IP options
 *------------------------------------------------------------------------
 */
int ipdstopts(pni, pep)
struct	netif	*pni;
struct	ep	*pep;
{
	struct	ip	*pip = (struct ip *)pep->ep_data;
	u_char		*popt, *popend;
	int		len;

	if (IP_HLEN(pip) == IPMHLEN)
		return OK;
	popt = pip->ip_data;
	popend = (u_char *)&pep->ep_data[IP_HLEN(pip)];

	/* NOTE: options not implemented yet */

	/* delete the options */
	len = pip->ip_len-IP_HLEN(pip);	/* data length	*/
	if (len)
		blkcopy(pip->ip_data, &pep->ep_data[IP_HLEN(pip)], len);
	pip->ip_len = IPMHLEN + len;
	pip->ip_verlen = (pip->ip_verlen&0xf0) | IP_MINHLEN;
	return OK;
}
@