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nexthop: Assert the invariant that a NH group is of only one type

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Most of the code that deals with nexthop groups relies on the fact that the
group is of exactly one well-known type. Currently there is only one type,
"mpath", but as more next-hop group types come, it becomes desirable to
have a central place where the setting is validated. Introduce such place
into nexthop_create_group(), such that the check is done before the code
that relies on that invariant is invoked.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Petr Machata 2021-01-28 13:49:16 +01:00 committed by Jakub Kicinski
parent b9bae61be4
commit 720ccd9a72
1 changed files with 5 additions and 2 deletions
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7
net/ipv4/nexthop.c
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@ -1466,10 +1466,13 @@ static struct nexthop *nexthop_create_group(struct net *net,
nhg->nh_entries[i].nh_parent = nh;
}
if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_MPATH) {
if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_MPATH)
nhg->mpath = 1;
WARN_ON_ONCE(nhg->mpath != 1);
if (nhg->mpath)
nh_group_rebalance(nhg);
}
if (cfg->nh_fdb)
nhg->fdb_nh = 1;