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From: Marek Lindner <lindner_marek@yahoo.de>
Date: Fri, 10 Feb 2012 22:21:19 +0800
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Subject: Re: [B.A.T.M.A.N.] [PATCHv5 4/9] batman-adv: Distributed ARP Table
	- add ARP parsing functions
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On Friday, February 10, 2012 07:41:37 Antonio Quartulli wrote:
> +#define ARP_HW_SRC(skb) ((uint8_t *)(skb->data) + sizeof(struct ethhdr) +
> \ +                       sizeof(struct arphdr))

You could replace all occurences of "sizeof(struct ethhdr)" with ETH_HLEN.

Cheers,
Marek