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netfilter: nft_quota: add stateful object type 

Register a new quota stateful object type into the new stateful object
infrastructure.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-11-28 00:04:43 +01:00
parent b1ce0ced10
commit 173705d9a2
2 changed files with 84 additions and 13 deletions
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1
include/uapi/linux/netfilter/nf_tables.h
View File

@ -1187,6 +1187,7 @@ enum nft_fib_flags {
#define NFT_OBJECT_UNSPEC 0
#define NFT_OBJECT_COUNTER 1
#define NFT_OBJECT_QUOTA 2
/**
* enum nft_object_attributes - nf_tables stateful object netlink attributes

96
net/netfilter/nft_quota.c
View File

@ -27,12 +27,10 @@ static inline bool nft_overquota(struct nft_quota *priv,
return atomic64_sub_return(pkt->skb->len, &priv->remain) < 0;
}
static void nft_quota_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
static inline void nft_quota_do_eval(struct nft_quota *priv,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_quota *priv = nft_expr_priv(expr);
if (nft_overquota(priv, pkt) ^ priv->invert)
regs->verdict.code = NFT_BREAK;
}
@ -42,11 +40,18 @@ static const struct nla_policy nft_quota_policy[NFTA_QUOTA_MAX + 1] = {
[NFTA_QUOTA_FLAGS] = { .type = NLA_U32 },
};
static int nft_quota_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
static void nft_quota_obj_eval(struct nft_object *obj,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_quota *priv = nft_obj_data(obj);
nft_quota_do_eval(priv, regs, pkt);
}
static int nft_quota_do_init(const struct nlattr * const tb[],
struct nft_quota *priv)
{
struct nft_quota *priv = nft_expr_priv(expr);
u32 flags = 0;
u64 quota;
@ -70,9 +75,16 @@ static int nft_quota_init(const struct nft_ctx *ctx,
return 0;
}
static int nft_quota_dump(struct sk_buff *skb, const struct nft_expr *expr)
static int nft_quota_obj_init(const struct nlattr * const tb[],
struct nft_object *obj)
{
struct nft_quota *priv = nft_obj_data(obj);
return nft_quota_do_init(tb, priv);
}
static int nft_quota_do_dump(struct sk_buff *skb, const struct nft_quota *priv)
{
const struct nft_quota *priv = nft_expr_priv(expr);
u32 flags = priv->invert ? NFT_QUOTA_F_INV : 0;
if (nla_put_be64(skb, NFTA_QUOTA_BYTES, cpu_to_be64(priv->quota),
@ -85,6 +97,49 @@ static int nft_quota_dump(struct sk_buff *skb, const struct nft_expr *expr)
return -1;
}
static int nft_quota_obj_dump(struct sk_buff *skb, const struct nft_object *obj)
{
struct nft_quota *priv = nft_obj_data(obj);
return nft_quota_do_dump(skb, priv);
}
static struct nft_object_type nft_quota_obj __read_mostly = {
.type = NFT_OBJECT_QUOTA,
.size = sizeof(struct nft_quota),
.maxattr = NFTA_QUOTA_MAX,
.policy = nft_quota_policy,
.init = nft_quota_obj_init,
.eval = nft_quota_obj_eval,
.dump = nft_quota_obj_dump,
.owner = THIS_MODULE,
};
static void nft_quota_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_quota *priv = nft_expr_priv(expr);
nft_quota_do_eval(priv, regs, pkt);
}
static int nft_quota_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_quota *priv = nft_expr_priv(expr);
return nft_quota_do_init(tb, priv);
}
static int nft_quota_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_quota *priv = nft_expr_priv(expr);
return nft_quota_do_dump(skb, priv);
}
static struct nft_expr_type nft_quota_type;
static const struct nft_expr_ops nft_quota_ops = {
.type = &nft_quota_type,
@ -105,12 +160,26 @@ static struct nft_expr_type nft_quota_type __read_mostly = {
static int __init nft_quota_module_init(void)
{
return nft_register_expr(&nft_quota_type);
int err;
err = nft_register_obj(&nft_quota_obj);
if (err < 0)
return err;
err = nft_register_expr(&nft_quota_type);
if (err < 0)
goto err1;
return 0;
err1:
nft_unregister_obj(&nft_quota_obj);
return err;
}
static void __exit nft_quota_module_exit(void)
{
nft_unregister_expr(&nft_quota_type);
nft_unregister_expr(&nft_quota_type);
nft_unregister_obj(&nft_quota_obj);
}
module_init(nft_quota_module_init);
@ -119,3 +188,4 @@ module_exit(nft_quota_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_ALIAS_NFT_EXPR("quota");
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_QUOTA);