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Commit 3ecbfd65 authored by Harsha Sharma's avatar Harsha Sharma Committed by Pablo Neira Ayuso
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netfilter: nf_tables: allocate handle and delete objects via handle 



This patch allows deletion of objects via unique handle which can be
listed via '-a' option.

Signed-off-by: default avatarHarsha Sharma <harshasharmaiitr@gmail.com>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent cc2d5863

include/net/netfilter/nf_tables.h

+9 −2
Original line number Diff line number Diff line
@@ -374,6 +374,7 @@ void nft_unregister_set(struct nft_set_type *type); 
 *	@list: table set list node

 *	@bindings: list of set bindings

 * 	@name: name of the set

 *	@handle: unique handle of the set

 * 	@ktype: key type (numeric type defined by userspace, not used in the kernel)

 * 	@dtype: data type (verdict or numeric type defined by userspace)

 * 	@objtype: object type (see NFT_OBJECT_* definitions)
@@ -396,6 +397,7 @@ struct nft_set { 
	struct list_head		list;

	struct list_head		bindings;

	char				*name;

	u64				handle;

	u32				ktype;

	u32				dtype;

	u32				objtype;
@@ -946,6 +948,7 @@ unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); 
 *	@objects: stateful objects in the table

 *	@flowtables: flow tables in the table

 *	@hgenerator: handle generator state

 *	@handle: table handle

 *	@use: number of chain references to this table

 *	@flags: table flag (see enum nft_table_flags)

 *	@genmask: generation mask
@@ -959,6 +962,7 @@ struct nft_table { 
	struct list_head		objects;

	struct list_head		flowtables;

	u64				hgenerator;

	u64				handle;

	u32				use;

	u16				family:6,

					flags:8,
@@ -983,9 +987,9 @@ int nft_verdict_dump(struct sk_buff *skb, int type, 
 *	@name: name of this stateful object

 *	@genmask: generation mask

 *	@use: number of references to this stateful object

 * 	@data: object data, layout depends on type

 *	@handle: unique object handle

 *	@ops: object operations

 *	@data: pointer to object data

 * 	@data: object data, layout depends on type

 */

struct nft_object {

	struct list_head		list;
@@ -993,6 +997,7 @@ struct nft_object { 
	struct nft_table		*table;

	u32				genmask:2,

					use:30;

	u64				handle;

	/* runtime data below here */

	const struct nft_object_ops	*ops ____cacheline_aligned;

	unsigned char			data[]
@@ -1074,6 +1079,7 @@ void nft_unregister_obj(struct nft_object_type *obj_type); 
 *	@ops_len: number of hooks in array

 *	@genmask: generation mask

 *	@use: number of references to this flow table

 * 	@handle: unique object handle

 *	@data: rhashtable and garbage collector

 * 	@ops: array of hooks

 */
@@ -1086,6 +1092,7 @@ struct nft_flowtable { 
	int				ops_len;

	u32				genmask:2,

					use:30;

	u64				handle;

	/* runtime data below here */

	struct nf_hook_ops		*ops ____cacheline_aligned;

	struct nf_flowtable		data;

include/uapi/linux/netfilter/nf_tables.h

+10 −0
Original line number Diff line number Diff line
@@ -174,6 +174,8 @@ enum nft_table_attributes { 
	NFTA_TABLE_NAME,

	NFTA_TABLE_FLAGS,

	NFTA_TABLE_USE,

	NFTA_TABLE_HANDLE,

	NFTA_TABLE_PAD,

	__NFTA_TABLE_MAX

};

#define NFTA_TABLE_MAX		(__NFTA_TABLE_MAX - 1)
@@ -317,6 +319,7 @@ enum nft_set_desc_attributes { 
 * @NFTA_SET_GC_INTERVAL: garbage collection interval (NLA_U32)

 * @NFTA_SET_USERDATA: user data (NLA_BINARY)

 * @NFTA_SET_OBJ_TYPE: stateful object type (NLA_U32: NFT_OBJECT_*)

 * @NFTA_SET_HANDLE: set handle (NLA_U64)

 */

enum nft_set_attributes {

	NFTA_SET_UNSPEC,
@@ -335,6 +338,7 @@ enum nft_set_attributes { 
	NFTA_SET_USERDATA,

	NFTA_SET_PAD,

	NFTA_SET_OBJ_TYPE,

	NFTA_SET_HANDLE,

	__NFTA_SET_MAX

};

#define NFTA_SET_MAX		(__NFTA_SET_MAX - 1)
@@ -1314,6 +1318,7 @@ enum nft_ct_helper_attributes { 
 * @NFTA_OBJ_TYPE: stateful object type (NLA_U32)

 * @NFTA_OBJ_DATA: stateful object data (NLA_NESTED)

 * @NFTA_OBJ_USE: number of references to this expression (NLA_U32)

 * @NFTA_OBJ_HANDLE: object handle (NLA_U64)

 */

enum nft_object_attributes {

	NFTA_OBJ_UNSPEC,
@@ -1322,6 +1327,8 @@ enum nft_object_attributes { 
	NFTA_OBJ_TYPE,

	NFTA_OBJ_DATA,

	NFTA_OBJ_USE,

	NFTA_OBJ_HANDLE,

	NFTA_OBJ_PAD,

	__NFTA_OBJ_MAX

};

#define NFTA_OBJ_MAX		(__NFTA_OBJ_MAX - 1)
@@ -1333,6 +1340,7 @@ enum nft_object_attributes { 
 * @NFTA_FLOWTABLE_NAME: name of this flow table (NLA_STRING)

 * @NFTA_FLOWTABLE_HOOK: netfilter hook configuration(NLA_U32)

 * @NFTA_FLOWTABLE_USE: number of references to this flow table (NLA_U32)

 * @NFTA_FLOWTABLE_HANDLE: object handle (NLA_U64)

 */

enum nft_flowtable_attributes {

	NFTA_FLOWTABLE_UNSPEC,
@@ -1340,6 +1348,8 @@ enum nft_flowtable_attributes { 
	NFTA_FLOWTABLE_NAME,

	NFTA_FLOWTABLE_HOOK,

	NFTA_FLOWTABLE_USE,

	NFTA_FLOWTABLE_HANDLE,

	NFTA_FLOWTABLE_PAD,

	__NFTA_FLOWTABLE_MAX

};

#define NFTA_FLOWTABLE_MAX	(__NFTA_FLOWTABLE_MAX - 1)

net/netfilter/nf_tables_api.c

+134 −12
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
static LIST_HEAD(nf_tables_expressions);

static LIST_HEAD(nf_tables_objects);

static LIST_HEAD(nf_tables_flowtables);

static u64 table_handle;



static void nft_ctx_init(struct nft_ctx *ctx,

			 struct net *net,
@@ -332,6 +333,20 @@ static struct nft_table *nft_table_lookup(const struct net *net, 
	return NULL;

}



static struct nft_table *nft_table_lookup_byhandle(const struct net *net,

						   const struct nlattr *nla,

						   u8 genmask)

{

	struct nft_table *table;



	list_for_each_entry(table, &net->nft.tables, list) {

		if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&

		    nft_active_genmask(table, genmask))

			return table;

	}

	return NULL;

}



static struct nft_table *nf_tables_table_lookup(const struct net *net,

						const struct nlattr *nla,

						u8 family, u8 genmask)
@@ -348,6 +363,22 @@ static struct nft_table *nf_tables_table_lookup(const struct net *net, 
	return ERR_PTR(-ENOENT);

}



static struct nft_table *nf_tables_table_lookup_byhandle(const struct net *net,

							 const struct nlattr *nla,

							 u8 genmask)

{

	struct nft_table *table;



	if (nla == NULL)

		return ERR_PTR(-EINVAL);



	table = nft_table_lookup_byhandle(net, nla, genmask);

	if (table != NULL)

		return table;



	return ERR_PTR(-ENOENT);

}



static inline u64 nf_tables_alloc_handle(struct nft_table *table)

{

	return ++table->hgenerator;
@@ -394,6 +425,7 @@ static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { 
	[NFTA_TABLE_NAME]	= { .type = NLA_STRING,

				    .len = NFT_TABLE_MAXNAMELEN - 1 },

	[NFTA_TABLE_FLAGS]	= { .type = NLA_U32 },

	[NFTA_TABLE_HANDLE]	= { .type = NLA_U64 },

};



static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
@@ -415,7 +447,9 @@ static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, 


	if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||

	    nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||

	    nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))

	    nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||

	    nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),

			 NFTA_TABLE_PAD))

		goto nla_put_failure;



	nlmsg_end(skb, nlh);
@@ -674,6 +708,7 @@ static int nf_tables_newtable(struct net *net, struct sock *nlsk, 
	INIT_LIST_HEAD(&table->flowtables);

	table->family = family;

	table->flags = flags;

	table->handle = ++table_handle;



	nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);

	err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
@@ -791,11 +826,18 @@ static int nf_tables_deltable(struct net *net, struct sock *nlsk, 
	struct nft_ctx ctx;



	nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);

	if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)

	if (family == AF_UNSPEC ||

	    (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))

		return nft_flush(&ctx, family);



	table = nf_tables_table_lookup(net, nla[NFTA_TABLE_NAME], family,

	if (nla[NFTA_TABLE_HANDLE])

		table = nf_tables_table_lookup_byhandle(net,

							nla[NFTA_TABLE_HANDLE],

							genmask);

	else

		table = nf_tables_table_lookup(net, nla[NFTA_TABLE_NAME],

					       family, genmask);



	if (IS_ERR(table))

		return PTR_ERR(table);
@@ -1539,6 +1581,7 @@ static int nf_tables_delchain(struct net *net, struct sock *nlsk, 
	struct nft_rule *rule;

	int family = nfmsg->nfgen_family;

	struct nft_ctx ctx;

	u64 handle;

	u32 use;

	int err;
@@ -1547,7 +1590,12 @@ static int nf_tables_delchain(struct net *net, struct sock *nlsk, 
	if (IS_ERR(table))

		return PTR_ERR(table);



	if (nla[NFTA_CHAIN_HANDLE]) {

		handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));

		chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);

	} else {

		chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);

	}

	if (IS_ERR(chain))

		return PTR_ERR(chain);
@@ -2503,6 +2551,7 @@ static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { 
	[NFTA_SET_USERDATA]		= { .type = NLA_BINARY,

					    .len  = NFT_USERDATA_MAXLEN },

	[NFTA_SET_OBJ_TYPE]		= { .type = NLA_U32 },

	[NFTA_SET_HANDLE]		= { .type = NLA_U64 },

};



static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
@@ -2546,6 +2595,22 @@ static struct nft_set *nf_tables_set_lookup(const struct nft_table *table, 
	return ERR_PTR(-ENOENT);

}



static struct nft_set *nf_tables_set_lookup_byhandle(const struct nft_table *table,

						     const struct nlattr *nla, u8 genmask)

{

	struct nft_set *set;



	if (nla == NULL)

		return ERR_PTR(-EINVAL);



	list_for_each_entry(set, &table->sets, list) {

		if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&

		    nft_active_genmask(set, genmask))

			return set;

	}

	return ERR_PTR(-ENOENT);

}



static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,

						 const struct nlattr *nla,

						 u8 genmask)
@@ -2661,6 +2726,9 @@ static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, 
		goto nla_put_failure;

	if (nla_put_string(skb, NFTA_SET_NAME, set->name))

		goto nla_put_failure;

	if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),

			 NFTA_SET_PAD))

		goto nla_put_failure;

	if (set->flags != 0)

		if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))

			goto nla_put_failure;
@@ -3069,6 +3137,7 @@ static int nf_tables_newset(struct net *net, struct sock *nlsk, 
	set->udata  = udata;

	set->timeout = timeout;

	set->gc_int = gc_int;

	set->handle = nf_tables_alloc_handle(table);



	err = ops->init(set, &desc, nla);

	if (err < 0)
@@ -3126,6 +3195,9 @@ static int nf_tables_delset(struct net *net, struct sock *nlsk, 
	if (err < 0)

		return err;



	if (nla[NFTA_SET_HANDLE])

		set = nf_tables_set_lookup_byhandle(ctx.table, nla[NFTA_SET_HANDLE], genmask);

	else

		set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);

	if (IS_ERR(set))

		return PTR_ERR(set);
@@ -4256,6 +4328,21 @@ struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, 
}

EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);



struct nft_object *nf_tables_obj_lookup_byhandle(const struct nft_table *table,

						 const struct nlattr *nla,

						 u32 objtype, u8 genmask)

{

	struct nft_object *obj;



	list_for_each_entry(obj, &table->objects, list) {

		if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&

		    objtype == obj->ops->type->type &&

		    nft_active_genmask(obj, genmask))

			return obj;

	}

	return ERR_PTR(-ENOENT);

}



static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {

	[NFTA_OBJ_TABLE]	= { .type = NLA_STRING,

				    .len = NFT_TABLE_MAXNAMELEN - 1 },
@@ -4263,6 +4350,7 @@ static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { 
				    .len = NFT_OBJ_MAXNAMELEN - 1 },

	[NFTA_OBJ_TYPE]		= { .type = NLA_U32 },

	[NFTA_OBJ_DATA]		= { .type = NLA_NESTED },

	[NFTA_OBJ_HANDLE]	= { .type = NLA_U64},

};



static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
@@ -4410,6 +4498,8 @@ static int nf_tables_newobj(struct net *net, struct sock *nlsk, 
		goto err1;

	}

	obj->table = table;

	obj->handle = nf_tables_alloc_handle(table);



	obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);

	if (!obj->name) {

		err = -ENOMEM;
@@ -4456,7 +4546,9 @@ static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, 
	    nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||

	    nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||

	    nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||

	    nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))

	    nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||

	    nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),

			 NFTA_OBJ_PAD))

		goto nla_put_failure;



	nlmsg_end(skb, nlh);
@@ -4654,7 +4746,7 @@ static int nf_tables_delobj(struct net *net, struct sock *nlsk, 
	u32 objtype;



	if (!nla[NFTA_OBJ_TYPE] ||

	    !nla[NFTA_OBJ_NAME])

	    (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))

		return -EINVAL;



	table = nf_tables_table_lookup(net, nla[NFTA_OBJ_TABLE], family,
@@ -4663,7 +4755,12 @@ static int nf_tables_delobj(struct net *net, struct sock *nlsk, 
		return PTR_ERR(table);



	objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));

	obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);

	if (nla[NFTA_OBJ_HANDLE])

		obj = nf_tables_obj_lookup_byhandle(table, nla[NFTA_OBJ_HANDLE],

						    objtype, genmask);

	else

		obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME],

					   objtype, genmask);

	if (IS_ERR(obj))

		return PTR_ERR(obj);

	if (obj->use > 0)
@@ -4735,6 +4832,7 @@ static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { 
	[NFTA_FLOWTABLE_NAME]		= { .type = NLA_STRING,

					    .len = NFT_NAME_MAXLEN - 1 },

	[NFTA_FLOWTABLE_HOOK]		= { .type = NLA_NESTED },

	[NFTA_FLOWTABLE_HANDLE]		= { .type = NLA_U64 },

};



struct nft_flowtable *nf_tables_flowtable_lookup(const struct nft_table *table,
@@ -4752,6 +4850,20 @@ struct nft_flowtable *nf_tables_flowtable_lookup(const struct nft_table *table, 
}

EXPORT_SYMBOL_GPL(nf_tables_flowtable_lookup);



struct nft_flowtable *

nf_tables_flowtable_lookup_byhandle(const struct nft_table *table,

				    const struct nlattr *nla, u8 genmask)

{

       struct nft_flowtable *flowtable;



       list_for_each_entry(flowtable, &table->flowtables, list) {

               if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&

                   nft_active_genmask(flowtable, genmask))

                       return flowtable;

       }

       return ERR_PTR(-ENOENT);

}



#define NFT_FLOWTABLE_DEVICE_MAX	8



static int nf_tables_parse_devices(const struct nft_ctx *ctx,
@@ -4960,6 +5072,8 @@ static int nf_tables_newflowtable(struct net *net, struct sock *nlsk, 
		return -ENOMEM;



	flowtable->table = table;

	flowtable->handle = nf_tables_alloc_handle(table);



	flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);

	if (!flowtable->name) {

		err = -ENOMEM;
@@ -5034,7 +5148,13 @@ static int nf_tables_delflowtable(struct net *net, struct sock *nlsk, 
	if (IS_ERR(table))

		return PTR_ERR(table);



	flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],

	if (nla[NFTA_FLOWTABLE_HANDLE])

		flowtable = nf_tables_flowtable_lookup_byhandle(table,

								nla[NFTA_FLOWTABLE_HANDLE],

								genmask);

	else

		flowtable = nf_tables_flowtable_lookup(table,

						       nla[NFTA_FLOWTABLE_NAME],

						       genmask);

	if (IS_ERR(flowtable))

                return PTR_ERR(flowtable);
@@ -5068,7 +5188,9 @@ static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, 


	if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||

	    nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||

	    nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)))

	    nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||

	    nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),

			 NFTA_FLOWTABLE_PAD))

		goto nla_put_failure;



	nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);