netdev - Re: [PATCH v2 3/4] bonding: arp_ip_count and arp

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Date:	Sun, 19 May 2013 01:28:38 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
CC:	netdev@...r.kernel.org, fubar@...ibm.com, andy@...yhouse.net,
	davem@...emloft.net
Subject: Re: [PATCH v2 3/4] bonding: arp_ip_count and arp_targets can be wrong

Hello.

On 18-05-2013 15:18, Nikolay Aleksandrov wrote:

> When getting arp_ip_targets if we encounter a bad IP, arp_ip_count still
> gets increased and all the targets after the wrong one will not be probed
> if arp_interval is enabled after that (unless a new IP target is added
> through sysfs) because of the zero entry, in this case reading
> arp_ip_target through sysfs will show valid targets even if there's a
> zero entry.
> Example: 1.2.3.4,4.5.6.7,blah,5.6.7.8
> When retrieving the list from arp_ip_target the output would be:
> 1.2.3.4,4.5.6.7,5.6.7.8
> but there will be a 0 entry between 4.5.6.7 and 5.6.7.8. If arp_interval
> is enabled after that 5.6.7.8 will never be checked because of that.

> Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>
> ---
>   drivers/net/bonding/bond_main.c | 19 ++++++++-----------
>   1 file changed, 8 insertions(+), 11 deletions(-)

> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 1a0cc13..d6a96cb 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
[...]
> @@ -4650,19 +4650,18 @@ static int bond_check_params(struct bond_params *params)
>   		arp_interval = BOND_LINK_ARP_INTERV;
>   	}
>
> -	for (arp_ip_count = 0;
> -	     (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
> -	     arp_ip_count++) {
> +	for (arp_ip_count = 0, i = 0;
> +	     (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
>   		/* not complete check, but should be good enough to
>   		   catch mistakes */
> -		__be32 ip = in_aton(arp_ip_target[arp_ip_count]);
> -		if (!isdigit(arp_ip_target[arp_ip_count][0]) ||
> -		    ip == 0 || ip == htonl(INADDR_BROADCAST)) {
> +		__be32 ip = in_aton(arp_ip_target[i]);

    Empty line wouldn't hurt here, after declaration.

> +		if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
> +		    ip == htonl(INADDR_BROADCAST)) {

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