netfilter: provide nft_ctx in object init function

this is needed by the upcoming ct helper object type --
we'd like to be able use the table family (ip, ip6, inet) to figure
out which helper has to be requested.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_tables.h

@@ -1017,7 +1017,8 @@ struct nft_object_type {
 	unsigned int			maxattr;
 	struct module			*owner;
 	const struct nla_policy		*policy;
-	int				(*init)(const struct nlattr * const tb[],
+	int				(*init)(const struct nft_ctx *ctx,
+						const struct nlattr *const tb[],
 						struct nft_object *obj);
 	void				(*destroy)(struct nft_object *obj);
 	int				(*dump)(struct sk_buff *skb,

net/netfilter/nf_tables_api.c

@@ -4095,7 +4095,8 @@ static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
 	[NFTA_OBJ_DATA]		= { .type = NLA_NESTED },
 };
 
-static struct nft_object *nft_obj_init(const struct nft_object_type *type,
+static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
+				       const struct nft_object_type *type,
 				       const struct nlattr *attr)
 {
 	struct nlattr *tb[type->maxattr + 1];
@@ -4115,7 +4116,7 @@ static struct nft_object *nft_obj_init(const struct nft_object_type *type,
 	if (obj == NULL)
 		goto err1;
 
-	err = type->init((const struct nlattr * const *)tb, obj);
+	err = type->init(ctx, (const struct nlattr * const *)tb, obj);
 	if (err < 0)
 		goto err2;
 
@@ -4223,7 +4224,7 @@ static int nf_tables_newobj(struct net *net, struct sock *nlsk,
 	if (IS_ERR(type))
 		return PTR_ERR(type);
 
-	obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
+	obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
 	if (IS_ERR(obj)) {
 		err = PTR_ERR(obj);
 		goto err1;

net/netfilter/nft_counter.c

@@ -82,7 +82,8 @@ static int nft_counter_do_init(const struct nlattr * const tb[],
 	return 0;
 }
 
-static int nft_counter_obj_init(const struct nlattr * const tb[],
+static int nft_counter_obj_init(const struct nft_ctx *ctx,
+				const struct nlattr * const tb[],
 				struct nft_object *obj)
 {
 	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

net/netfilter/nft_quota.c

@@ -99,7 +99,8 @@ static int nft_quota_do_init(const struct nlattr * const tb[],
 	return 0;
 }
 
-static int nft_quota_obj_init(const struct nlattr * const tb[],
+static int nft_quota_obj_init(const struct nft_ctx *ctx,
+			      const struct nlattr * const tb[],
 			      struct nft_object *obj)
 {
 	struct nft_quota *priv = nft_obj_data(obj);