// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2012-2016 Pablo Neira Ayuso <pablo@netfilter.org> */ #include <linux/init.h>#include <linux/module.h>#include <linux/skbuff.h>#include <linux/netlink.h>#include <linux/netfilter.h>#include <linux/netfilter/nf_tables.h>#include <net/netfilter/nf_tables.h> #define nft_objref_priv(expr)	*((struct nft_object **)nft_expr_priv(expr)) static void nft_objref_eval(const struct nft_expr *expr,			    struct nft_regs *regs,			    const struct nft_pktinfo *pkt){	struct nft_object *obj = nft_objref_priv(expr); 	obj->ops->eval(obj, regs, pkt);} static int nft_objref_init(const struct nft_ctx *ctx,			   const struct nft_expr *expr,			   const struct nlattr * const tb[]){	struct nft_object *obj = nft_objref_priv(expr);	u8 genmask = nft_genmask_next(ctx->net);	u32 objtype; 	if (!tb[NFTA_OBJREF_IMM_NAME] ||	    !tb[NFTA_OBJREF_IMM_TYPE])		return -EINVAL; 	objtype = ntohl(nla_get_be32(tb[NFTA_OBJREF_IMM_TYPE]));	obj = nft_obj_lookup(ctx->net, ctx->table,			     tb[NFTA_OBJREF_IMM_NAME], objtype,			     genmask);	if (IS_ERR(obj))		return -ENOENT; 	nft_objref_priv(expr) = obj;	obj->use++; 	return 0;} static int nft_objref_dump(struct sk_buff *skb, const struct nft_expr *expr){	const struct nft_object *obj = nft_objref_priv(expr); 	if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->key.name) ||	    nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE,			 htonl(obj->ops->type->type)))		goto nla_put_failure; 	return 0; nla_put_failure:	return -1;} static void nft_objref_deactivate(const struct nft_ctx *ctx,				  const struct nft_expr *expr,				  enum nft_trans_phase phase){	struct nft_object *obj = nft_objref_priv(expr); 	if (phase == NFT_TRANS_COMMIT)		return; 	obj->use--;} static void nft_objref_activate(const struct nft_ctx *ctx,				const struct nft_expr *expr){	struct nft_object *obj = nft_objref_priv(expr); 	obj->use++;} static struct nft_expr_type nft_objref_type;static const struct nft_expr_ops nft_objref_ops = {	.type		= &nft_objref_type,	.size		= NFT_EXPR_SIZE(sizeof(struct nft_object *)),	.eval		= nft_objref_eval,	.init		= nft_objref_init,	.activate	= nft_objref_activate,	.deactivate	= nft_objref_deactivate,	.dump		= nft_objref_dump,}; struct nft_objref_map {	struct nft_set		*set;	enum nft_registers	sreg:8;	struct nft_set_binding	binding;}; static void nft_objref_map_eval(const struct nft_expr *expr,				struct nft_regs *regs,				const struct nft_pktinfo *pkt){	struct nft_objref_map *priv = nft_expr_priv(expr);	const struct nft_set *set = priv->set;	const struct nft_set_ext *ext;	struct nft_object *obj;	bool found; 	found = set->ops->lookup(nft_net(pkt), set, &regs->data[priv->sreg],				 &ext);	if (!found) {		regs->verdict.code = NFT_BREAK;		return;	}	obj = *nft_set_ext_obj(ext);	obj->ops->eval(obj, regs, pkt);} static int nft_objref_map_init(const struct nft_ctx *ctx,			       const struct nft_expr *expr,			       const struct nlattr * const tb[]){	struct nft_objref_map *priv = nft_expr_priv(expr);	u8 genmask = nft_genmask_next(ctx->net);	struct nft_set *set;	int err; 	set = nft_set_lookup_global(ctx->net, ctx->table,				    tb[NFTA_OBJREF_SET_NAME],				    tb[NFTA_OBJREF_SET_ID], genmask);	if (IS_ERR(set))		return PTR_ERR(set); 	if (!(set->flags & NFT_SET_OBJECT))		return -EINVAL; 	priv->sreg = nft_parse_register(tb[NFTA_OBJREF_SET_SREG]);	err = nft_validate_register_load(priv->sreg, set->klen);	if (err < 0)		return err; 	priv->binding.flags = set->flags & NFT_SET_OBJECT; 	err = nf_tables_bind_set(ctx, set, &priv->binding);	if (err < 0)		return err; 	priv->set = set;	return 0;} static int nft_objref_map_dump(struct sk_buff *skb, const struct nft_expr *expr){	const struct nft_objref_map *priv = nft_expr_priv(expr); 	if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) ||	    nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name))		goto nla_put_failure; 	return 0; nla_put_failure:	return -1;} static void nft_objref_map_deactivate(const struct nft_ctx *ctx,				      const struct nft_expr *expr,				      enum nft_trans_phase phase){	struct nft_objref_map *priv = nft_expr_priv(expr); 	nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);} static void nft_objref_map_activate(const struct nft_ctx *ctx,				    const struct nft_expr *expr){	struct nft_objref_map *priv = nft_expr_priv(expr); 	priv->set->use++;} static void nft_objref_map_destroy(const struct nft_ctx *ctx,				   const struct nft_expr *expr){	struct nft_objref_map *priv = nft_expr_priv(expr); 	nf_tables_destroy_set(ctx, priv->set);} static struct nft_expr_type nft_objref_type;static const struct nft_expr_ops nft_objref_map_ops = {	.type		= &nft_objref_type,	.size		= NFT_EXPR_SIZE(sizeof(struct nft_objref_map)),	.eval		= nft_objref_map_eval,	.init		= nft_objref_map_init,	.activate	= nft_objref_map_activate,	.deactivate	= nft_objref_map_deactivate,	.destroy	= nft_objref_map_destroy,	.dump		= nft_objref_map_dump,}; static const struct nft_expr_ops *nft_objref_select_ops(const struct nft_ctx *ctx,                      const struct nlattr * const tb[]){	if (tb[NFTA_OBJREF_SET_SREG] &&	    (tb[NFTA_OBJREF_SET_NAME] ||	     tb[NFTA_OBJREF_SET_ID]))		return &nft_objref_map_ops;	else if (tb[NFTA_OBJREF_IMM_NAME] &&		 tb[NFTA_OBJREF_IMM_TYPE])		return &nft_objref_ops; 	return ERR_PTR(-EOPNOTSUPP);} static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = {	[NFTA_OBJREF_IMM_NAME]	= { .type = NLA_STRING,				    .len = NFT_OBJ_MAXNAMELEN - 1 },	[NFTA_OBJREF_IMM_TYPE]	= { .type = NLA_U32 },	[NFTA_OBJREF_SET_SREG]	= { .type = NLA_U32 },	[NFTA_OBJREF_SET_NAME]	= { .type = NLA_STRING,				    .len = NFT_SET_MAXNAMELEN - 1 },	[NFTA_OBJREF_SET_ID]	= { .type = NLA_U32 },}; static struct nft_expr_type nft_objref_type __read_mostly = {	.name		= "objref",	.select_ops	= nft_objref_select_ops,	.policy		= nft_objref_policy,	.maxattr	= NFTA_OBJREF_MAX,	.owner		= THIS_MODULE,}; static int __init nft_objref_module_init(void){	return nft_register_expr(&nft_objref_type);} static void __exit nft_objref_module_exit(void){	nft_unregister_expr(&nft_objref_type);} module_init(nft_objref_module_init);module_exit(nft_objref_module_exit); MODULE_LICENSE("GPL");MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");MODULE_ALIAS_NFT_EXPR("objref");MODULE_DESCRIPTION("nftables stateful object reference module");