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From: Marek Lindner <lindner_marek@yahoo.de>
Date: Tue, 18 Sep 2012 10:59:03 +0800
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Subject: Re: [B.A.T.M.A.N.] echo counting in batmand
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Hi,

> if ((has_directlink_flag) && (if_incoming->addr.sin_addr.s_addr ==
> bat_packet->orig) && (bat_packet->seqno - if_incoming->out.seqno + 2
> == 0)) {
> 
> 					debug_output(4, "count own bcast (is_my_orig): old = %i, 
",
> orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
> 
> 					bit_mark((TYPE_OF_WORD
> *)&(orig_neigh_node->bcast_own[if_incoming->if_num * num_words]), 0);
> 					orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
> bit_packet_count((TYPE_OF_WORD
> *)&(orig_neigh_node->bcast_own[if_incoming->if_num * num_words]));
> 
> 					debug_output(4, "new = %i \n",
> orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
> 
> 				}

you may want to look at the corresponding kernel code because it is way 
cleaner and easier to understand.

Cheers,
Marek