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netfilter: nf_tables: add nft_expr_type_request_module()

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This helper function makes sure the family specific extension is loaded.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2019-07-05 23:38:46 +02:00
parent 2a3a93ef0b
commit b9c04ae790
1 changed files with 14 additions and 3 deletions
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17
net/netfilter/nf_tables_api.c
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@ -2019,6 +2019,19 @@ static const struct nft_expr_type *__nft_expr_type_get(u8 family,
return NULL;
}
#ifdef CONFIG_MODULES
static int nft_expr_type_request_module(struct net *net, u8 family,
struct nlattr *nla)
{
nft_request_module(net, "nft-expr-%u-%.*s", family,
nla_len(nla), (char *)nla_data(nla));
if (__nft_expr_type_get(family, nla))
return -EAGAIN;
return 0;
}
#endif
static const struct nft_expr_type *nft_expr_type_get(struct net *net,
u8 family,
struct nlattr *nla)
@ -2035,9 +2048,7 @@ static const struct nft_expr_type *nft_expr_type_get(struct net *net,
lockdep_nfnl_nft_mutex_not_held();
#ifdef CONFIG_MODULES
if (type == NULL) {
nft_request_module(net, "nft-expr-%u-%.*s", family,
nla_len(nla), (char *)nla_data(nla));
if (__nft_expr_type_get(family, nla))
if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
return ERR_PTR(-EAGAIN);
nft_request_module(net, "nft-expr-%.*s",