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netfilter: nft_numgen: rename until attribute by modulus

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The _until_ attribute is renamed to _modulus_ as the behaviour is similar to
other expresions with number limits (ex. nft_hash).

Renaming is possible because there isn't a kernel release yet with these
changes.

Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Laura Garcia Liebana 2016-09-02 15:05:57 +02:00 committed by Pablo Neira Ayuso
parent ddb075b0cd
commit 0d9932b287
2 changed files with 17 additions and 17 deletions
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4
include/uapi/linux/netfilter/nf_tables.h
View File

@ -1126,13 +1126,13 @@ enum nft_trace_types {
* enum nft_ng_attributes - nf_tables number generator expression netlink attributes
*
* @NFTA_NG_DREG: destination register (NLA_U32)
* @NFTA_NG_UNTIL: source value to increment the counter until reset (NLA_U32)
* @NFTA_NG_MODULUS: maximum counter value (NLA_U32)
* @NFTA_NG_TYPE: operation type (NLA_U32)
*/
enum nft_ng_attributes {
NFTA_NG_UNSPEC,
NFTA_NG_DREG,
NFTA_NG_UNTIL,
NFTA_NG_MODULUS,
NFTA_NG_TYPE,
__NFTA_NG_MAX
};

30
net/netfilter/nft_numgen.c
View File

@ -21,7 +21,7 @@ static DEFINE_PER_CPU(struct rnd_state, nft_numgen_prandom_state);
struct nft_ng_inc {
enum nft_registers dreg:8;
u32 until;
u32 modulus;
atomic_t counter;
};
@ -34,7 +34,7 @@ static void nft_ng_inc_eval(const struct nft_expr *expr,
do {
oval = atomic_read(&priv->counter);
nval = (oval + 1 < priv->until) ? oval + 1 : 0;
nval = (oval + 1 < priv->modulus) ? oval + 1 : 0;
} while (atomic_cmpxchg(&priv->counter, oval, nval) != oval);
memcpy(&regs->data[priv->dreg], &priv->counter, sizeof(u32));
@ -42,7 +42,7 @@ static void nft_ng_inc_eval(const struct nft_expr *expr,
static const struct nla_policy nft_ng_policy[NFTA_NG_MAX + 1] = {
[NFTA_NG_DREG] = { .type = NLA_U32 },
[NFTA_NG_UNTIL] = { .type = NLA_U32 },
[NFTA_NG_MODULUS] = { .type = NLA_U32 },
[NFTA_NG_TYPE] = { .type = NLA_U32 },
};
@ -52,8 +52,8 @@ static int nft_ng_inc_init(const struct nft_ctx *ctx,
{
struct nft_ng_inc *priv = nft_expr_priv(expr);
priv->until = ntohl(nla_get_be32(tb[NFTA_NG_UNTIL]));
if (priv->until == 0)
priv->modulus = ntohl(nla_get_be32(tb[NFTA_NG_MODULUS]));
if (priv->modulus == 0)
return -ERANGE;
priv->dreg = nft_parse_register(tb[NFTA_NG_DREG]);
@ -64,11 +64,11 @@ static int nft_ng_inc_init(const struct nft_ctx *ctx,
}
static int nft_ng_dump(struct sk_buff *skb, enum nft_registers dreg,
u32 until, enum nft_ng_types type)
u32 modulus, enum nft_ng_types type)
{
if (nft_dump_register(skb, NFTA_NG_DREG, dreg))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_NG_UNTIL, htonl(until)))
if (nla_put_be32(skb, NFTA_NG_MODULUS, htonl(modulus)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_NG_TYPE, htonl(type)))
goto nla_put_failure;
@ -83,12 +83,12 @@ static int nft_ng_inc_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_ng_inc *priv = nft_expr_priv(expr);
return nft_ng_dump(skb, priv->dreg, priv->until, NFT_NG_INCREMENTAL);
return nft_ng_dump(skb, priv->dreg, priv->modulus, NFT_NG_INCREMENTAL);
}
struct nft_ng_random {
enum nft_registers dreg:8;
u32 until;
u32 modulus;
};
static void nft_ng_random_eval(const struct nft_expr *expr,
@ -99,7 +99,7 @@ static void nft_ng_random_eval(const struct nft_expr *expr,
struct rnd_state *state = this_cpu_ptr(&nft_numgen_prandom_state);
regs->data[priv->dreg] = reciprocal_scale(prandom_u32_state(state),
priv->until);
priv->modulus);
}
static int nft_ng_random_init(const struct nft_ctx *ctx,
@ -108,8 +108,8 @@ static int nft_ng_random_init(const struct nft_ctx *ctx,
{
struct nft_ng_random *priv = nft_expr_priv(expr);
priv->until = ntohl(nla_get_be32(tb[NFTA_NG_UNTIL]));
if (priv->until == 0)
priv->modulus = ntohl(nla_get_be32(tb[NFTA_NG_MODULUS]));
if (priv->modulus == 0)
return -ERANGE;
prandom_init_once(&nft_numgen_prandom_state);
@ -124,7 +124,7 @@ static int nft_ng_random_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_ng_random *priv = nft_expr_priv(expr);
return nft_ng_dump(skb, priv->dreg, priv->until, NFT_NG_RANDOM);
return nft_ng_dump(skb, priv->dreg, priv->modulus, NFT_NG_RANDOM);
}
static struct nft_expr_type nft_ng_type;
@ -149,8 +149,8 @@ nft_ng_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
{
u32 type;
if (!tb[NFTA_NG_DREG] ||
!tb[NFTA_NG_UNTIL] ||
if (!tb[NFTA_NG_DREG] ||
!tb[NFTA_NG_MODULUS] ||
!tb[NFTA_NG_TYPE])
return ERR_PTR(-EINVAL);