Subject: Re: [PATCH 6/17 net-2.6.26] [NETNS]: Default arp parameters lookup.

From: Daniel Lezcano <[email-masked]>
Date: Tue, 19 Feb 2008 10:51:12 +0100

Denis V. Lunev wrote:
> On Tue, 2008-02-19 at 10:14 +0100, Daniel Lezcano wrote:
>> Denis V. Lunev wrote:
>>> Default ARP parameters should be findable regardless of the context.
>>> Required to make inetdev_event working.
>>>
>>> Signed-off-by: Denis V. Lunev <[email-masked]>
>>> ---
>>>  net/core/neighbour.c |    4 +---
>>>  1 files changed, 1 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
>>> index c895ad4..45ed620 100644
>>> --- a/net/core/neighbour.c
>>> +++ b/net/core/neighbour.c
>>> @@ -1275,9 +1275,7 @@ static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl,
>>>  	struct neigh_parms *p;
>>>
>>>  	for (p = &tbl->parms; p; p = p->next) {
>>> -		if (p->net != net)
>>> -			continue;
>>> -		if ((p->dev && p->dev->ifindex == ifindex) ||
>>> +		if ((p->dev && p->dev->ifindex == ifindex && p->net == net) ||
>>>  		    (!p->dev && !ifindex))
>>>  			return p;
>>>  	}
>> If the values are:
>> 	p->dev == NULL
>> 	ifindex == 0
>> 	p->net != net
>>
>> The parms should not be taken into account and the looping must 
>> continue. But with this modification it is not the case, if we specify 
>> parms ifindex == 0, the first parms with the dev field set to NULL will 
>> be taken belonging or not to the right net.
> 
> They should be taken. In the other case inetdev_event will fail for sure
> in the middle. You could check.
> 
> These are ARP defaults and I do not see a problem for now to get them.

Because there is a parms default per namespace. So several instances of 
them per nd table. That was the initial approach with Eric's patchset.