From: Harsha Sharma <harshasharmai...@gmail.com>
This patch allows deletion of objects via unique handle which can be
listed via '-a' option.
Signed-off-by: Harsha Sharma <harshasharmai...@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
include/net/netfilter/nf_tables.h | 11 ++-
include/uapi/linux/netfilter/nf_tables.h | 10 +++
net/netfilter/nf_tables_api.c | 146 ++++++++++++++++++++++++++++---
3 files changed, 153 insertions(+), 14 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h
b/include/net/netfilter/nf_tables.h
index 4aca413367ee..663b015dace5 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -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;
diff --git a/include/uapi/linux/netfilter/nf_tables.h
b/include/uapi/linux/netfilter/nf_tables.h
index 53e8dd2a3a03..66dceee0ae30 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -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)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index b541e5094dce..1addc401ff7d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -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,
- genmask);
+ 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);
- chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
+ 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)
@@ -3126,7 +3195,10 @@ static int nf_tables_delset(struct net *net, struct sock
*nlsk,
if (err < 0)
return err;
- set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
+ 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;
@@ -5034,8 +5148,14 @@ 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],
- genmask);
+ 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);
if (flowtable->use > 0)
@@ -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);
--
2.11.0
