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netfilter: nft_fwd_netdev: validate family and chain type

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commit 76a109fac206e158eb3c967af98c178cff738e6a upstream.

Make sure the forward action is only used from ingress.

Fixes: 39e6dea28a ("netfilter: nf_tables: add forward expression to the netdev family")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2020-03-23 14:27:16 +01:00 • committed by Greg Kroah-Hartman
commit 5be3b97a1f
1 changed files with 9 additions and 0 deletions
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9
net/netfilter/nft_fwd_netdev.c
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@ -190,6 +190,13 @@ nla_put_failure:
return -1;
}
static int nft_fwd_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
{
return nft_chain_validate_hooks(ctx->chain, (1 << NF_NETDEV_INGRESS));
}
static struct nft_expr_type nft_fwd_netdev_type;
static const struct nft_expr_ops nft_fwd_neigh_netdev_ops = {
.type = &nft_fwd_netdev_type,
@ -197,6 +204,7 @@ static const struct nft_expr_ops nft_fwd_neigh_netdev_ops = {
.eval = nft_fwd_neigh_eval,
.init = nft_fwd_neigh_init,
.dump = nft_fwd_neigh_dump,
.validate = nft_fwd_validate,
};
static const struct nft_expr_ops nft_fwd_netdev_ops = {
@ -205,6 +213,7 @@ static const struct nft_expr_ops nft_fwd_netdev_ops = {
.eval = nft_fwd_netdev_eval,
.init = nft_fwd_netdev_init,
.dump = nft_fwd_netdev_dump,
.validate = nft_fwd_validate,
.offload = nft_fwd_netdev_offload,
};