Give all set backends a descriptive name and export it via new
netlink attribute NFTA_SET_OPS.
Via an accompanying patch to libnftnl, the chosen backend can be made
visible to userspace by means of 'nft monitor json'.
Signed-off-by: Phil Sutter <phil@xxxxxx>
---
include/net/netfilter/nf_tables.h | 2 ++
include/uapi/linux/netfilter/nf_tables.h | 2 ++
net/netfilter/nf_tables_api.c | 3 +++
net/netfilter/nft_set_bitmap.c | 1 +
net/netfilter/nft_set_hash.c | 3 +++
net/netfilter/nft_set_rbtree.c | 1 +
6 files changed, 12 insertions(+)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index ff4723ba51f29..e8e3bfe5d9c3f 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -352,12 +352,14 @@ struct nft_set_ops {
* @list: used internally
* @owner: module reference
* @features: features supported by the implementation
+ * @name: descriptive name of this set backend
*/
struct nft_set_type {
const struct nft_set_ops ops;
struct list_head list;
struct module *owner;
u32 features;
+ const char *name;
};
#define to_set_type(o) container_of(o, struct nft_set_type, ops)
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 6a3d653d5b274..e2716590d203d 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -320,6 +320,7 @@ enum nft_set_desc_attributes {
* @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)
+ * @NFTA_SET_OPS: name of chosen set ops (NLA_STRING)
*/
enum nft_set_attributes {
NFTA_SET_UNSPEC,
@@ -339,6 +340,7 @@ enum nft_set_attributes {
NFTA_SET_PAD,
NFTA_SET_OBJ_TYPE,
NFTA_SET_HANDLE,
+ NFTA_SET_OPS,
__NFTA_SET_MAX
};
#define NFTA_SET_MAX (__NFTA_SET_MAX - 1)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index c90e7bf8d63c9..8e9ce40392085 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2831,6 +2831,9 @@ static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
goto nla_put_failure;
nla_nest_end(skb, desc);
+ if (nla_put_string(skb, NFTA_SET_OPS, to_set_type(set->ops)->name))
+ goto nla_put_failure;
+
nlmsg_end(skb, nlh);
return 0;
diff --git a/net/netfilter/nft_set_bitmap.c b/net/netfilter/nft_set_bitmap.c
index d6626e01c7ee6..437a146a1a710 100644
--- a/net/netfilter/nft_set_bitmap.c
+++ b/net/netfilter/nft_set_bitmap.c
@@ -297,6 +297,7 @@ static bool nft_bitmap_estimate(const struct nft_set_desc *desc, u32 features,
}
static struct nft_set_type nft_bitmap_type __read_mostly = {
+ .name = "bitmap",
.owner = THIS_MODULE,
.ops = {
.privsize = nft_bitmap_privsize,
diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c
index dbf1f4ad077c5..76b0468e248b6 100644
--- a/net/netfilter/nft_set_hash.c
+++ b/net/netfilter/nft_set_hash.c
@@ -639,6 +639,7 @@ static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features
}
static struct nft_set_type nft_rhash_type __read_mostly = {
+ .name = "rhash",
.owner = THIS_MODULE,
.features = NFT_SET_MAP | NFT_SET_OBJECT |
NFT_SET_TIMEOUT | NFT_SET_EVAL,
@@ -661,6 +662,7 @@ static struct nft_set_type nft_rhash_type __read_mostly = {
};
static struct nft_set_type nft_hash_type __read_mostly = {
+ .name = "hash",
.owner = THIS_MODULE,
.features = NFT_SET_MAP | NFT_SET_OBJECT,
.ops = {
@@ -681,6 +683,7 @@ static struct nft_set_type nft_hash_type __read_mostly = {
};
static struct nft_set_type nft_hash_fast_type __read_mostly = {
+ .name = "fast hash",
.owner = THIS_MODULE,
.features = NFT_SET_MAP | NFT_SET_OBJECT,
.ops = {
diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c
index 22c57d7612c47..a3d0325e713c0 100644
--- a/net/netfilter/nft_set_rbtree.c
+++ b/net/netfilter/nft_set_rbtree.c
@@ -394,6 +394,7 @@ static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features,
}
static struct nft_set_type nft_rbtree_type __read_mostly = {
+ .name = "rbtree",
.owner = THIS_MODULE,
.features = NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT,
.ops = {
--
2.16.1
--
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