netdev - Re: [PATCH net-next 2/3 v2] net: ipv4 sysctl option to ignore routes when nexthop link is down

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Message-ID: <CAE4R7bAgBMjeQHpZv8_-h9RnLg2vVLwn537jEKmVQ-A=aY50QQ@mail.gmail.com>
Date:	Wed, 10 Jun 2015 19:18:59 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, ddutt@...ulusnetworks.com,
	Alexander Duyck <alexander.duyck@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: Re: [PATCH net-next 2/3 v2] net: ipv4 sysctl option to ignore routes
 when nexthop link is down

On Wed, Jun 10, 2015 at 7:12 PM, Scott Feldman <sfeldma@...il.com> wrote:
> On Tue, Jun 9, 2015 at 11:47 PM, Andy Gospodarek
> <gospo@...ulusnetworks.com> wrote:
>
>>  /* /proc/sys/net/ipv4/netfilter */
>> diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
>> index 7e7746a..c9d0a0e 100644
>> --- a/kernel/sysctl_binary.c
>> +++ b/kernel/sysctl_binary.c
>> @@ -253,6 +253,7 @@ static const struct bin_table bin_net_ipv4_conf_vars_table[] = {
>>         { CTL_INT,      NET_IPV4_CONF_NOPOLICY,                 "disable_policy" },
>>         { CTL_INT,      NET_IPV4_CONF_FORCE_IGMP_VERSION,       "force_igmp_version" },
>>         { CTL_INT,      NET_IPV4_CONF_PROMOTE_SECONDARIES,      "promote_secondaries" },
>> +       { CTL_INT,      NET_IPV4_CONF_IGNORE_ROUTES_WITH_LINKDOWN,      "ignore_routes_with_linkdown" },
>
> Would "route_ignore_linkdown_nexthops" be a more accurate name?  The
> patch marks link-downed nexthops to be ignored, not the route,
> correct?
>
> s/NET_IPV4_CONF_IGNORE_ROUTES_WITH_LINKDOWN/NET_IPV4_CONF_ROUTE_IGNORE_LINKDOWN_NEXTHOPS

Something like that.  Not sure I like my suggestion.  If dev is
nexthop dev in route, and dev is link down, exclude nexthop in route
lookup.

route_exclude_if_linkdown_nexthop_dev?
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