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netfilter: nf_tables: prepare for expressions associated to set elements 

Preparation to attach expressions to set elements: add a set extension
type to hold an expression and dump the expression information with the
set element.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2015-04-11 10:46:39 +01:00 committed by Pablo Neira Ayuso
parent 0b2d8a7b63
commit f25ad2e907
3 changed files with 18 additions and 0 deletions
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7
include/net/netfilter/nf_tables.h
View File

@ -371,6 +371,7 @@ void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
* @NFT_SET_EXT_TIMEOUT: element timeout
* @NFT_SET_EXT_EXPIRATION: element expiration time
* @NFT_SET_EXT_USERDATA: user data associated with the element
* @NFT_SET_EXT_EXPR: expression assiociated with the element
* @NFT_SET_EXT_NUM: number of extension types
*/
enum nft_set_extensions {
@ -380,6 +381,7 @@ enum nft_set_extensions {
NFT_SET_EXT_TIMEOUT,
NFT_SET_EXT_EXPIRATION,
NFT_SET_EXT_USERDATA,
NFT_SET_EXT_EXPR,
NFT_SET_EXT_NUM
};
@ -491,6 +493,11 @@ static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext
return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
}
static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_EXPR);
}
static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
{
return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&

2
include/uapi/linux/netfilter/nf_tables.h
View File

@ -322,6 +322,7 @@ enum nft_set_elem_flags {
* @NFTA_SET_ELEM_TIMEOUT: timeout value (NLA_U64)
* @NFTA_SET_ELEM_EXPIRATION: expiration time (NLA_U64)
* @NFTA_SET_ELEM_USERDATA: user data (NLA_BINARY)
* @NFTA_SET_ELEM_EXPR: expression (NLA_NESTED: nft_expr_attributes)
*/
enum nft_set_elem_attributes {
NFTA_SET_ELEM_UNSPEC,
@ -331,6 +332,7 @@ enum nft_set_elem_attributes {
NFTA_SET_ELEM_TIMEOUT,
NFTA_SET_ELEM_EXPIRATION,
NFTA_SET_ELEM_USERDATA,
NFTA_SET_ELEM_EXPR,
__NFTA_SET_ELEM_MAX
};
#define NFTA_SET_ELEM_MAX (__NFTA_SET_ELEM_MAX - 1)

9
net/netfilter/nf_tables_api.c
View File

@ -2904,6 +2904,9 @@ const struct nft_set_ext_type nft_set_ext_types[] = {
[NFT_SET_EXT_DATA] = {
.align = __alignof__(u32),
},
[NFT_SET_EXT_EXPR] = {
.align = __alignof__(struct nft_expr),
},
[NFT_SET_EXT_FLAGS] = {
.len = sizeof(u8),
.align = __alignof__(u8),
@ -2990,6 +2993,10 @@ static int nf_tables_fill_setelem(struct sk_buff *skb,
set->dlen) < 0)
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
htonl(*nft_set_ext_flags(ext))))
@ -3276,6 +3283,8 @@ void nft_set_elem_destroy(const struct nft_set *set, void *elem)
nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
nft_data_uninit(nft_set_ext_data(ext), set->dtype);
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
kfree(elem);
}