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[NEIGH]: Add a comment describing what a NUD stands for. 

When I studied the neighbor code I puzzled over what the NUD can mean
for quite a long time.

Finally I asked Alexey and he said that this was smth like "neighbor
unreachability detection".

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-01-10 22:37:16 -08:00 committed by David S. Miller
parent 9993e7d313
commit 39971554d3
1 changed files with 4 additions and 0 deletions
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4
include/net/neighbour.h
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@ -26,6 +26,10 @@
#include <linux/sysctl.h>
#include <net/rtnetlink.h>
/*
* NUD stands for "neighbor unreachability detection"
*/
#define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
#define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
#define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)