| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.2 17/85] net-ipv6: fix excessive RTF_ADDRCONF flag on ::1/128 local route (and others) | Date | Wed, 18 Sep 2019 08:18:35 +0200 |
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From: "Maciej Żenczykowski" <maze@google.com>
[ Upstream commit d55a2e374a94fa34a3048c6a2be535266e506d97 ]
There is a subtle change in behaviour introduced by: commit c7a1ce397adacaf5d4bb2eab0a738b5f80dc3e43 'ipv6: Change addrconf_f6i_alloc to use ip6_route_info_create'
Before that patch /proc/net/ipv6_route includes: 00000000000000000000000000000001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000003 00000000 80200001 lo
Afterwards /proc/net/ipv6_route includes: 00000000000000000000000000000001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000002 00000000 80240001 lo
ie. the above commit causes the ::1/128 local (automatic) route to be flagged with RTF_ADDRCONF (0x040000).
AFAICT, this is incorrect since these routes are *not* coming from RA's.
As such, this patch restores the old behaviour.
Fixes: c7a1ce397ada ("ipv6: Change addrconf_f6i_alloc to use ip6_route_info_create") Cc: David Ahern <dsahern@gmail.com> Cc: Lorenzo Colitti <lorenzo@google.com> Signed-off-by: Maciej Żenczykowski <maze@google.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/ipv6/route.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -3841,13 +3841,14 @@ struct fib6_info *addrconf_f6i_alloc(str struct fib6_config cfg = { .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL, .fc_ifindex = idev->dev->ifindex, - .fc_flags = RTF_UP | RTF_ADDRCONF | RTF_NONEXTHOP, + .fc_flags = RTF_UP | RTF_NONEXTHOP, .fc_dst = *addr, .fc_dst_len = 128, .fc_protocol = RTPROT_KERNEL, .fc_nlinfo.nl_net = net, .fc_ignore_dev_down = true, }; + struct fib6_info *f6i; if (anycast) { cfg.fc_type = RTN_ANYCAST; @@ -3857,7 +3858,10 @@ struct fib6_info *addrconf_f6i_alloc(str cfg.fc_flags |= RTF_LOCAL; } - return ip6_route_info_create(&cfg, gfp_flags, NULL); + f6i = ip6_route_info_create(&cfg, gfp_flags, NULL); + if (f6i) + f6i->dst_nocount = true; + return f6i; } /* remove deleted ip from prefsrc entries */
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