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netfilter: nf_tables: Reject tables of unsupported family

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commit f1082dd31fe461d482d69da2a8eccfeb7bf07ac2 upstream.

An nftables family is merely a hollow container, its family just a
number and such not reliant on compile-time options other than nftables
support itself. Add an artificial check so attempts at using a family
the kernel can't support fail as early as possible. This helps user
space detect kernels which lack e.g. NFPROTO_INET.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Phil Sutter 2022-02-16 15:55:38 +01:00 committed by Greg Kroah-Hartman
parent c67bf30baf
commit 8711fa0c06
1 changed files with 27 additions and 0 deletions
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27
net/netfilter/nf_tables_api.c
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@ -1005,6 +1005,30 @@ static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
return strcmp(obj->key.name, k->name);
}
static bool nft_supported_family(u8 family)
{
return false
#ifdef CONFIG_NF_TABLES_INET
|| family == NFPROTO_INET
#endif
#ifdef CONFIG_NF_TABLES_IPV4
|| family == NFPROTO_IPV4
#endif
#ifdef CONFIG_NF_TABLES_ARP
|| family == NFPROTO_ARP
#endif
#ifdef CONFIG_NF_TABLES_NETDEV
|| family == NFPROTO_NETDEV
#endif
#if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
|| family == NFPROTO_BRIDGE
#endif
#ifdef CONFIG_NF_TABLES_IPV6
|| family == NFPROTO_IPV6
#endif
;
}
static int nf_tables_newtable(struct net *net, struct sock *nlsk,
struct sk_buff *skb, const struct nlmsghdr *nlh,
const struct nlattr * const nla[],
@ -1020,6 +1044,9 @@ static int nf_tables_newtable(struct net *net, struct sock *nlsk,
struct nft_ctx ctx;
int err;
if (!nft_supported_family(family))
return -EOPNOTSUPP;
lockdep_assert_held(&nft_net->commit_mutex);
attr = nla[NFTA_TABLE_NAME];
table = nft_table_lookup(net, attr, family, genmask);