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neighbour: Don't render blackhole_netdev via RTM_GETNEIGHTBL.

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The cited commits started to initialise blackhole_netdev with
neigh_parms_alloc().

This is visible in init_net as the ifindex==0 entries via
RTM_GETNEIGHTBL:

  # ynl --family rt-neigh --dump getneightbl --output-json \
    | jq '.[] | select(.parms.ifindex == 0)
              | {name: .name, ifindex: .parms.ifindex}'
  {
    "name": "arp_cache",
    "ifindex": 0
  }
  {
    "name": "ndisc_cache",
    "ifindex": 0
  }

For RTM_SETNEIGHTBL, ifindex being 0 means wildcard.

Let's skip blackhole_netdev's parms in neightbl_dump_info().

Note that lookup_neigh_parms() does not need the same change
because the default parms is always the first entry and matches
with ifindex == 0.

Fixes: e5f80fcf86 ("ipv6: give an IPv6 dev to blackhole_netdev")
Fixes: 22600596b6 ("ipv4: give an IPv4 dev to blackhole_netdev")
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260909233143.2401847-4-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2026-09-09 23:31:25 +00:00 committed by Jakub Kicinski
parent 6d79b223ec
commit 7b430fcfc9
1 changed files with 1 additions and 1 deletions
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2
net/core/neighbour.c
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@ -2624,7 +2624,7 @@ static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
if (!net_eq(neigh_parms_net(p), net))
continue;
if (!p->dev)
if (!p->dev || p->dev == blackhole_netdev)
continue;
if (nidx < neigh_skip)