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netfilter: nf_tables: Make meta expression core functions public

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This will be useful to create network family dedicated META expression
as for NFPROTO_BRIDGE for instance.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Tomasz Bursztyka 2014-04-14 15:41:27 +03:00 committed by Pablo Neira Ayuso
parent 758dbcecf1
commit aa45660c6b
2 changed files with 61 additions and 25 deletions
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36
include/net/netfilter/nft_meta.h Normal file
View File

@ -0,0 +1,36 @@
#ifndef _NFT_META_H_
#define _NFT_META_H_
struct nft_meta {
enum nft_meta_keys key:8;
union {
enum nft_registers dreg:8;
enum nft_registers sreg:8;
};
};
extern const struct nla_policy nft_meta_policy[];
int nft_meta_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[]);
int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[]);
int nft_meta_get_dump(struct sk_buff *skb,
const struct nft_expr *expr);
int nft_meta_set_dump(struct sk_buff *skb,
const struct nft_expr *expr);
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt);
void nft_meta_set_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt);
#endif

50
net/netfilter/nft_meta.c
View File

@ -18,18 +18,11 @@
#include <net/sock.h>
#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nft_meta.h>
struct nft_meta {
enum nft_meta_keys key:8;
union {
enum nft_registers dreg:8;
enum nft_registers sreg:8;
};
};
static void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt)
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt)
{
const struct nft_meta *priv = nft_expr_priv(expr);
const struct sk_buff *skb = pkt->skb;
@ -140,10 +133,11 @@ static void nft_meta_get_eval(const struct nft_expr *expr,
err:
data[NFT_REG_VERDICT].verdict = NFT_BREAK;
}
EXPORT_SYMBOL_GPL(nft_meta_get_eval);
static void nft_meta_set_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt)
void nft_meta_set_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt)
{
const struct nft_meta *meta = nft_expr_priv(expr);
struct sk_buff *skb = pkt->skb;
@ -163,16 +157,18 @@ static void nft_meta_set_eval(const struct nft_expr *expr,
WARN_ON(1);
}
}
EXPORT_SYMBOL_GPL(nft_meta_set_eval);
static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
[NFTA_META_DREG] = { .type = NLA_U32 },
[NFTA_META_KEY] = { .type = NLA_U32 },
[NFTA_META_SREG] = { .type = NLA_U32 },
};
EXPORT_SYMBOL_GPL(nft_meta_policy);
static int nft_meta_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
int nft_meta_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_meta *priv = nft_expr_priv(expr);
int err;
@ -215,10 +211,11 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
return 0;
}
EXPORT_SYMBOL_GPL(nft_meta_get_init);
static int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_meta *priv = nft_expr_priv(expr);
int err;
@ -240,9 +237,10 @@ static int nft_meta_set_init(const struct nft_ctx *ctx,
return 0;
}
EXPORT_SYMBOL_GPL(nft_meta_set_init);
static int nft_meta_get_dump(struct sk_buff *skb,
const struct nft_expr *expr)
int nft_meta_get_dump(struct sk_buff *skb,
const struct nft_expr *expr)
{
const struct nft_meta *priv = nft_expr_priv(expr);
@ -255,9 +253,10 @@ static int nft_meta_get_dump(struct sk_buff *skb,
nla_put_failure:
return -1;
}
EXPORT_SYMBOL_GPL(nft_meta_get_dump);
static int nft_meta_set_dump(struct sk_buff *skb,
const struct nft_expr *expr)
int nft_meta_set_dump(struct sk_buff *skb,
const struct nft_expr *expr)
{
const struct nft_meta *priv = nft_expr_priv(expr);
@ -271,6 +270,7 @@ static int nft_meta_set_dump(struct sk_buff *skb,
nla_put_failure:
return -1;
}
EXPORT_SYMBOL_GPL(nft_meta_set_dump);
static struct nft_expr_type nft_meta_type;
static const struct nft_expr_ops nft_meta_get_ops = {