[netdevice] Add MAX_NET_HEADER_LEN and MAX_LL_NET_HEADER_LEN
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -45,6 +45,16 @@ struct device;
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/** Maximum length of a network-layer address */
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#define MAX_NET_ADDR_LEN 4
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/** Maximum length of a network-layer header
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*
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* The longest currently-supported network-layer header is for IPv6 at
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* 40 bytes.
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*/
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#define MAX_NET_HEADER_LEN 40
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/** Maximum combined length of a link-layer and network-layer header */
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#define MAX_LL_NET_HEADER_LEN ( MAX_LL_HEADER_LEN + MAX_NET_HEADER_LEN )
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/**
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* A network-layer protocol
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*
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