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authorMaciej ┼╗enczykowski <maze@google.com>2019-09-02 09:23:36 -0700
committerDavid S. Miller <davem@davemloft.net>2019-09-05 00:31:50 +0200
commitd55a2e374a94fa34a3048c6a2be535266e506d97 (patch)
treeaabaa7f2b246209a378fa34b24436446fc990139 /net/ipv6/route.c
parentsctp: use transport pf_retrans in sctp_do_8_2_transport_strike (diff)
downloadlinux-dev-d55a2e374a94fa34a3048c6a2be535266e506d97.tar.xz
linux-dev-d55a2e374a94fa34a3048c6a2be535266e506d97.zip
net-ipv6: fix excessive RTF_ADDRCONF flag on ::1/128 local route (and others)
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 ┼╗enczykowski <maze@google.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/route.c')
-rw-r--r--net/ipv6/route.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index fd059e08785a..2927e72e511a 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4388,13 +4388,14 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net,
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;
@@ -4404,7 +4405,10 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net,
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 */