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    Subject[PATCH 4.14 109/148] netfilter: nft_fwd_netdev: validate family and chain type
    Date
    From: Pablo Neira Ayuso <pablo@netfilter.org>

    commit 76a109fac206e158eb3c967af98c178cff738e6a upstream.

    Make sure the forward action is only used from ingress.

    Fixes: 39e6dea28adc ("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>

    ---
    net/netfilter/nft_fwd_netdev.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    --- a/net/netfilter/nft_fwd_netdev.c
    +++ b/net/netfilter/nft_fwd_netdev.c
    @@ -62,6 +62,13 @@ 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_netdev_ops = {
    .type = &nft_fwd_netdev_type,
    @@ -69,6 +76,7 @@ static const struct nft_expr_ops nft_fwd
    .eval = nft_fwd_netdev_eval,
    .init = nft_fwd_netdev_init,
    .dump = nft_fwd_netdev_dump,
    + .validate = nft_fwd_validate,
    };

    static struct nft_expr_type nft_fwd_netdev_type __read_mostly = {

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