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| author |   Ido Schimmel <idosch@nvidia.com> | 2020-08-26 19:48:54 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-08-26 16:00:51 -0700 |
| commit | 863b25581ce9e6f27dd9acc210356ca35ffe30a2 (patch) | |
| tree | 39394225bfa63c2d9532d7663e58668526f60f2d /net/ipv4 | |
| parent | ipv4: nexthop: Remove unnecessary rtnl_dereference() (diff) | |
| download | linux-dev-863b25581ce9e6f27dd9acc210356ca35ffe30a2.tar.xz linux-dev-863b25581ce9e6f27dd9acc210356ca35ffe30a2.zip | |
ipv4: nexthop: Correctly update nexthop group when removing a nexthop
Each nexthop group contains an indication if it has IPv4 nexthops
('has_v4'). Its purpose is to prevent IPv6 routes from using groups with
IPv4 nexthops.
However, the indication is not updated when a nexthop is removed. This
results in the kernel wrongly rejecting IPv6 routes from pointing to
groups that only contain IPv6 nexthops. Example:
# ip nexthop replace id 1 via 192.0.2.2 dev dummy10
# ip nexthop replace id 2 via 2001:db8:1::2 dev dummy10
# ip nexthop replace id 10 group 1/2
# ip nexthop del id 1
# ip route replace 2001:db8:10::/64 nhid 10
Error: IPv6 routes can not use an IPv4 nexthop.
Solve this by updating the indication according to the new set of
member nexthops.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/nexthop.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c index 1b736e3e1baa..5199a2815df6 100644 --- a/net/ipv4/nexthop.c +++ b/net/ipv4/nexthop.c @@ -797,7 +797,7 @@ static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge, return; } - newg->has_v4 = nhg->has_v4; + newg->has_v4 = false; newg->mpath = nhg->mpath; newg->fdb_nh = nhg->fdb_nh; newg->num_nh = nhg->num_nh; @@ -806,12 +806,18 @@ static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge, nhges = nhg->nh_entries; new_nhges = newg->nh_entries; for (i = 0, j = 0; i < nhg->num_nh; ++i) { + struct nh_info *nhi; + /* current nexthop getting removed */ if (nhg->nh_entries[i].nh == nh) { newg->num_nh--; continue; } + nhi = rtnl_dereference(nhges[i].nh->nh_info); + if (nhi->family == AF_INET) + newg->has_v4 = true; + list_del(&nhges[i].nh_list); new_nhges[j].nh_parent = nhges[i].nh_parent; new_nhges[j].nh = nhges[i].nh; |