ethmcast.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 88 行

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date	97.09.21.19.27.59;	author dls;	state Dist;
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date	94.01.07.03.10.26;	author dls;	state Old;
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@/* ethmcast.c - ethmcast */

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

Eaddr	template = { 0x01, 0x00, 0x5E, 0x00, 0x00, 0x00 };

/*------------------------------------------------------------------------
 *  ethmcast -  generate & set an IP multicast Ethernet address
 *------------------------------------------------------------------------
 */
int ethmcast(op, dev, hwa, ipa)
int		op;
int		dev;
Eaddr		hwa;
IPaddr		ipa;
{
	ipa = net2hl(ipa);
	blkcopy(hwa, template, EP_ALEN);

	/* add in low-order 23 bits of IP multicast address */
	hwa[3] = (ipa >> 16) & 0x7;
	hwa[4] = (ipa >> 8);
	hwa[5] = ipa;

	switch (op) {
	case NI_MADD:
		return control(dev, EPC_MADD, hwa);
		break;
	case NI_MDEL:
		return control(dev, EPC_MDEL, hwa);
		break;
	}
	return OK;
}
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 *  ethmcast -  generate & set an IP multicast hardware address
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	hwa[3] = ipa[1] & 0x7;
	hwa[4] = ipa[2];
	hwa[5] = ipa[3];
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		return control(dev, EPC_MULTICAST, hwa);
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