Re: [PATCH net 1/2] ipv6: create multicast route with RTPROT_KERNEL
On Sat, Jan 16, 2021 at 5:36 AM David Ahern wrote: > > On 1/15/21 11:42 AM, Matteo Croce wrote: > > From: Matteo Croce > > > > 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 > > --- > > 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(_dst, htonl(0xFF00), 0, 0, 0); > > > > > What's the motivation for changing this? ie., what s/w cares that it is > kernel vs boot? A practical example: systemd-networkd explicitly ignores routes with kernel flag[1]. Having a different flag leads the daemon to remove the route sooner or later. [1] https://github.com/systemd/systemd/blob/0b81225e5791f660506f7db0ab88078cf296b771/src/network/networkd-routing-policy-rule.c#L675-L677 -- per aspera ad upstream
Re: [PATCH net 1/2] ipv6: create multicast route with RTPROT_KERNEL
On 1/15/21 11:42 AM, Matteo Croce wrote: > From: Matteo Croce > > 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 > --- > 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(_dst, htonl(0xFF00), 0, 0, 0); > What's the motivation for changing this? ie., what s/w cares that it is kernel vs boot?
[PATCH net 1/2] ipv6: create multicast route with RTPROT_KERNEL
From: Matteo Croce 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 --- 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(_dst, htonl(0xFF00), 0, 0, 0); -- 2.29.2
