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netfilter: nft_limit: rename stateful structure 

From struct nft_limit to nft_limit_priv.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2022-01-09 17:11:17 +01:00
parent 567882eb3d
commit 369b6cb5d3
1 changed files with 52 additions and 52 deletions
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104
net/netfilter/nft_limit.c
View File

@ -14,7 +14,7 @@
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
struct nft_limit {
struct nft_limit_priv {
spinlock_t lock;
u64 last;
u64 tokens;
@ -25,33 +25,33 @@ struct nft_limit {
bool invert;
};
static inline bool nft_limit_eval(struct nft_limit *limit, u64 cost)
static inline bool nft_limit_eval(struct nft_limit_priv *priv, u64 cost)
{
u64 now, tokens;
s64 delta;
spin_lock_bh(&limit->lock);
spin_lock_bh(&priv->lock);
now = ktime_get_ns();
tokens = limit->tokens + now - limit->last;
if (tokens > limit->tokens_max)
tokens = limit->tokens_max;
tokens = priv->tokens + now - priv->last;
if (tokens > priv->tokens_max)
tokens = priv->tokens_max;
limit->last = now;
priv->last = now;
delta = tokens - cost;
if (delta >= 0) {
limit->tokens = delta;
spin_unlock_bh(&limit->lock);
return limit->invert;
priv->tokens = delta;
spin_unlock_bh(&priv->lock);
return priv->invert;
}
limit->tokens = tokens;
spin_unlock_bh(&limit->lock);
return !limit->invert;
priv->tokens = tokens;
spin_unlock_bh(&priv->lock);
return !priv->invert;
}
/* Use same default as in iptables. */
#define NFT_LIMIT_PKT_BURST_DEFAULT 5
static int nft_limit_init(struct nft_limit *limit,
static int nft_limit_init(struct nft_limit_priv *priv,
const struct nlattr * const tb[], bool pkts)
{
u64 unit, tokens;
@ -60,58 +60,58 @@ static int nft_limit_init(struct nft_limit *limit,
tb[NFTA_LIMIT_UNIT] == NULL)
return -EINVAL;
limit->rate = be64_to_cpu(nla_get_be64(tb[NFTA_LIMIT_RATE]));
priv->rate = be64_to_cpu(nla_get_be64(tb[NFTA_LIMIT_RATE]));
unit = be64_to_cpu(nla_get_be64(tb[NFTA_LIMIT_UNIT]));
limit->nsecs = unit * NSEC_PER_SEC;
if (limit->rate == 0 || limit->nsecs < unit)
priv->nsecs = unit * NSEC_PER_SEC;
if (priv->rate == 0 || priv->nsecs < unit)
return -EOVERFLOW;
if (tb[NFTA_LIMIT_BURST])
limit->burst = ntohl(nla_get_be32(tb[NFTA_LIMIT_BURST]));
priv->burst = ntohl(nla_get_be32(tb[NFTA_LIMIT_BURST]));
if (pkts && limit->burst == 0)
limit->burst = NFT_LIMIT_PKT_BURST_DEFAULT;
if (pkts && priv->burst == 0)
priv->burst = NFT_LIMIT_PKT_BURST_DEFAULT;
if (limit->rate + limit->burst < limit->rate)
if (priv->rate + priv->burst < priv->rate)
return -EOVERFLOW;
if (pkts) {
tokens = div64_u64(limit->nsecs, limit->rate) * limit->burst;
tokens = div64_u64(priv->nsecs, priv->rate) * priv->burst;
} else {
/* The token bucket size limits the number of tokens can be
* accumulated. tokens_max specifies the bucket size.
* tokens_max = unit * (rate + burst) / rate.
*/
tokens = div64_u64(limit->nsecs * (limit->rate + limit->burst),
limit->rate);
tokens = div64_u64(priv->nsecs * (priv->rate + priv->burst),
priv->rate);
}
limit->tokens = tokens;
limit->tokens_max = limit->tokens;
priv->tokens = tokens;
priv->tokens_max = priv->tokens;
if (tb[NFTA_LIMIT_FLAGS]) {
u32 flags = ntohl(nla_get_be32(tb[NFTA_LIMIT_FLAGS]));
if (flags & NFT_LIMIT_F_INV)
limit->invert = true;
priv->invert = true;
}
limit->last = ktime_get_ns();
spin_lock_init(&limit->lock);
priv->last = ktime_get_ns();
spin_lock_init(&priv->lock);
return 0;
}
static int nft_limit_dump(struct sk_buff *skb, const struct nft_limit *limit,
static int nft_limit_dump(struct sk_buff *skb, const struct nft_limit_priv *priv,
enum nft_limit_type type)
{
u32 flags = limit->invert ? NFT_LIMIT_F_INV : 0;
u64 secs = div_u64(limit->nsecs, NSEC_PER_SEC);
u32 flags = priv->invert ? NFT_LIMIT_F_INV : 0;
u64 secs = div_u64(priv->nsecs, NSEC_PER_SEC);
if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(limit->rate),
if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(priv->rate),
NFTA_LIMIT_PAD) ||
nla_put_be64(skb, NFTA_LIMIT_UNIT, cpu_to_be64(secs),
NFTA_LIMIT_PAD) ||
nla_put_be32(skb, NFTA_LIMIT_BURST, htonl(limit->burst)) ||
nla_put_be32(skb, NFTA_LIMIT_BURST, htonl(priv->burst)) ||
nla_put_be32(skb, NFTA_LIMIT_TYPE, htonl(type)) ||
nla_put_be32(skb, NFTA_LIMIT_FLAGS, htonl(flags)))
goto nla_put_failure;
@ -121,8 +121,8 @@ nla_put_failure:
return -1;
}
struct nft_limit_pkts {
struct nft_limit limit;
struct nft_limit_priv_pkts {
struct nft_limit_priv limit;
u64 cost;
};
@ -130,7 +130,7 @@ static void nft_limit_pkts_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_limit_pkts *priv = nft_expr_priv(expr);
struct nft_limit_priv_pkts *priv = nft_expr_priv(expr);
if (nft_limit_eval(&priv->limit, priv->cost))
regs->verdict.code = NFT_BREAK;
@ -148,7 +148,7 @@ static int nft_limit_pkts_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_limit_pkts *priv = nft_expr_priv(expr);
struct nft_limit_priv_pkts *priv = nft_expr_priv(expr);
int err;
err = nft_limit_init(&priv->limit, tb, true);
@ -161,7 +161,7 @@ static int nft_limit_pkts_init(const struct nft_ctx *ctx,
static int nft_limit_pkts_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_limit_pkts *priv = nft_expr_priv(expr);
const struct nft_limit_priv_pkts *priv = nft_expr_priv(expr);
return nft_limit_dump(skb, &priv->limit, NFT_LIMIT_PKTS);
}
@ -169,7 +169,7 @@ static int nft_limit_pkts_dump(struct sk_buff *skb, const struct nft_expr *expr)
static struct nft_expr_type nft_limit_type;
static const struct nft_expr_ops nft_limit_pkts_ops = {
.type = &nft_limit_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit_pkts)),
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit_priv_pkts)),
.eval = nft_limit_pkts_eval,
.init = nft_limit_pkts_init,
.dump = nft_limit_pkts_dump,
@ -179,7 +179,7 @@ static void nft_limit_bytes_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_limit *priv = nft_expr_priv(expr);
struct nft_limit_priv *priv = nft_expr_priv(expr);
u64 cost = div64_u64(priv->nsecs * pkt->skb->len, priv->rate);
if (nft_limit_eval(priv, cost))
@ -190,7 +190,7 @@ static int nft_limit_bytes_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_limit *priv = nft_expr_priv(expr);
struct nft_limit_priv *priv = nft_expr_priv(expr);
return nft_limit_init(priv, tb, false);
}
@ -198,14 +198,14 @@ static int nft_limit_bytes_init(const struct nft_ctx *ctx,
static int nft_limit_bytes_dump(struct sk_buff *skb,
const struct nft_expr *expr)
{
const struct nft_limit *priv = nft_expr_priv(expr);
const struct nft_limit_priv *priv = nft_expr_priv(expr);
return nft_limit_dump(skb, priv, NFT_LIMIT_PKT_BYTES);
}
static const struct nft_expr_ops nft_limit_bytes_ops = {
.type = &nft_limit_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit)),
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit_priv)),
.eval = nft_limit_bytes_eval,
.init = nft_limit_bytes_init,
.dump = nft_limit_bytes_dump,
@ -240,7 +240,7 @@ static void nft_limit_obj_pkts_eval(struct nft_object *obj,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_limit_pkts *priv = nft_obj_data(obj);
struct nft_limit_priv_pkts *priv = nft_obj_data(obj);
if (nft_limit_eval(&priv->limit, priv->cost))
regs->verdict.code = NFT_BREAK;
@ -250,7 +250,7 @@ static int nft_limit_obj_pkts_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[],
struct nft_object *obj)
{
struct nft_limit_pkts *priv = nft_obj_data(obj);
struct nft_limit_priv_pkts *priv = nft_obj_data(obj);
int err;
err = nft_limit_init(&priv->limit, tb, true);
@ -265,7 +265,7 @@ static int nft_limit_obj_pkts_dump(struct sk_buff *skb,
struct nft_object *obj,
bool reset)
{
const struct nft_limit_pkts *priv = nft_obj_data(obj);
const struct nft_limit_priv_pkts *priv = nft_obj_data(obj);
return nft_limit_dump(skb, &priv->limit, NFT_LIMIT_PKTS);
}
@ -273,7 +273,7 @@ static int nft_limit_obj_pkts_dump(struct sk_buff *skb,
static struct nft_object_type nft_limit_obj_type;
static const struct nft_object_ops nft_limit_obj_pkts_ops = {
.type = &nft_limit_obj_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit_pkts)),
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit_priv_pkts)),
.init = nft_limit_obj_pkts_init,
.eval = nft_limit_obj_pkts_eval,
.dump = nft_limit_obj_pkts_dump,
@ -283,7 +283,7 @@ static void nft_limit_obj_bytes_eval(struct nft_object *obj,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_limit *priv = nft_obj_data(obj);
struct nft_limit_priv *priv = nft_obj_data(obj);
u64 cost = div64_u64(priv->nsecs * pkt->skb->len, priv->rate);
if (nft_limit_eval(priv, cost))
@ -294,7 +294,7 @@ static int nft_limit_obj_bytes_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[],
struct nft_object *obj)
{
struct nft_limit *priv = nft_obj_data(obj);
struct nft_limit_priv *priv = nft_obj_data(obj);
return nft_limit_init(priv, tb, false);
}
@ -303,7 +303,7 @@ static int nft_limit_obj_bytes_dump(struct sk_buff *skb,
struct nft_object *obj,
bool reset)
{
const struct nft_limit *priv = nft_obj_data(obj);
const struct nft_limit_priv *priv = nft_obj_data(obj);
return nft_limit_dump(skb, priv, NFT_LIMIT_PKT_BYTES);
}
@ -311,7 +311,7 @@ static int nft_limit_obj_bytes_dump(struct sk_buff *skb,
static struct nft_object_type nft_limit_obj_type;
static const struct nft_object_ops nft_limit_obj_bytes_ops = {
.type = &nft_limit_obj_type,
.size = sizeof(struct nft_limit),
.size = sizeof(struct nft_limit_priv),
.init = nft_limit_obj_bytes_init,
.eval = nft_limit_obj_bytes_eval,
.dump = nft_limit_obj_bytes_dump,