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SubjectRe: [PATCH net 1/2] ipv6: create multicast route with RTPROT_KERNEL
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On 1/15/21 11:42 AM, Matteo Croce wrote:
> From: Matteo Croce <mcroce@microsoft.com>
>
> The ff00::/8 multicast route is created without specifying the fc_protocol
> field, so the default RTPROT_BOOT value is used:
>
> $ ip -6 -d route
> unicast ::1 dev lo proto kernel scope global metric 256 pref medium
> unicast fe80::/64 dev eth0 proto kernel scope global metric 256 pref medium
> unicast ff00::/8 dev eth0 proto boot scope global metric 256 pref medium
>
> As the documentation says, this value identifies routes installed during
> boot, but the route is created when interface is set up.
> Change the value to RTPROT_KERNEL which is a better value.
>
> Signed-off-by: Matteo Croce <mcroce@microsoft.com>
> ---
> net/ipv6/addrconf.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index eff2cacd5209..19bf6822911c 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -2469,6 +2469,7 @@ static void addrconf_add_mroute(struct net_device *dev)
> .fc_flags = RTF_UP,
> .fc_type = RTN_UNICAST,
> .fc_nlinfo.nl_net = dev_net(dev),
> + .fc_protocol = RTPROT_KERNEL,
> };
>
> ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
>


What's the motivation for changing this? ie., what s/w cares that it is
kernel vs boot?

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