Release 4.13 net/netfilter/nft_limit.c
/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
struct nft_limit {
spinlock_t lock;
u64 last;
u64 tokens;
u64 tokens_max;
u64 rate;
u64 nsecs;
u32 burst;
bool invert;
};
static inline bool nft_limit_eval(struct nft_limit *limit, u64 cost)
{
u64 now, tokens;
s64 delta;
spin_lock_bh(&limit->lock);
now = ktime_get_ns();
tokens = limit->tokens + now - limit->last;
if (tokens > limit->tokens_max)
tokens = limit->tokens_max;
limit->last = now;
delta = tokens - cost;
if (delta >= 0) {
limit->tokens = delta;
spin_unlock_bh(&limit->lock);
return limit->invert;
}
limit->tokens = tokens;
spin_unlock_bh(&limit->lock);
return !limit->invert;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 69 | 57.02% | 3 | 60.00% |
| Patrick McHardy | 43 | 35.54% | 1 | 20.00% |
| Liping Zhang | 9 | 7.44% | 1 | 20.00% |
| Total | 121 | 100.00% | 5 | 100.00% |
static int nft_limit_init(struct nft_limit *limit,
const struct nlattr * const tb[])
{
u64 unit;
if (tb[NFTA_LIMIT_RATE] == NULL ||
tb[NFTA_LIMIT_UNIT] == NULL)
return -EINVAL;
limit->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)
return -EOVERFLOW;
if (tb[NFTA_LIMIT_BURST])
limit->burst = ntohl(nla_get_be32(tb[NFTA_LIMIT_BURST]));
else
limit->burst = 0;
if (limit->rate + limit->burst < limit->rate)
return -EOVERFLOW;
/* The token bucket size limits the number of tokens can be
* accumulated. tokens_max specifies the bucket size.
* tokens_max = unit * (rate + burst) / rate.
*/
limit->tokens = div_u64(limit->nsecs * (limit->rate + limit->burst),
limit->rate);
limit->tokens_max = limit->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;
}
limit->last = ktime_get_ns();
spin_lock_init(&limit->lock);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 112 | 48.70% | 4 | 57.14% |
| Patrick McHardy | 73 | 31.74% | 1 | 14.29% |
| Andy Zhou | 37 | 16.09% | 1 | 14.29% |
| Liping Zhang | 8 | 3.48% | 1 | 14.29% |
| Total | 230 | 100.00% | 7 | 100.00% |
static int nft_limit_dump(struct sk_buff *skb, const struct nft_limit *limit,
enum nft_limit_type type)
{
u32 flags = limit->invert ? NFT_LIMIT_F_INV : 0;
u64 secs = div_u64(limit->nsecs, NSEC_PER_SEC);
if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(limit->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_TYPE, htonl(type)) ||
nla_put_be32(skb, NFTA_LIMIT_FLAGS, htonl(flags)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 69 | 54.76% | 5 | 62.50% |
| Patrick McHardy | 51 | 40.48% | 1 | 12.50% |
| Nicolas Dichtel | 4 | 3.17% | 1 | 12.50% |
| Andy Zhou | 2 | 1.59% | 1 | 12.50% |
| Total | 126 | 100.00% | 8 | 100.00% |
struct nft_limit_pkts {
struct nft_limit limit;
u64 cost;
};
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);
if (nft_limit_eval(&priv->limit, priv->cost))
regs->verdict.code = NFT_BREAK;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 55 | 100.00% | 2 | 100.00% |
| Total | 55 | 100.00% | 2 | 100.00% |
static const struct nla_policy nft_limit_policy[NFTA_LIMIT_MAX + 1] = {
[NFTA_LIMIT_RATE] = { .type = NLA_U64 },
[NFTA_LIMIT_UNIT] = { .type = NLA_U64 },
[NFTA_LIMIT_BURST] = { .type = NLA_U32 },
[NFTA_LIMIT_TYPE] = { .type = NLA_U32 },
[NFTA_LIMIT_FLAGS] = { .type = NLA_U32 },
};
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);
int err;
err = nft_limit_init(&priv->limit, tb);
if (err < 0)
return err;
priv->cost = div64_u64(priv->limit.nsecs, priv->limit.rate);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 81 | 98.78% | 2 | 66.67% |
| Liping Zhang | 1 | 1.22% | 1 | 33.33% |
| Total | 82 | 100.00% | 3 | 100.00% |
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);
return nft_limit_dump(skb, &priv->limit, NFT_LIMIT_PKTS);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 41 | 100.00% | 3 | 100.00% |
| Total | 41 | 100.00% | 3 | 100.00% |
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)),
.eval = nft_limit_pkts_eval,
.init = nft_limit_pkts_init,
.dump = nft_limit_pkts_dump,
};
static void nft_limit_pkt_bytes_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_limit *priv = nft_expr_priv(expr);
u64 cost = div64_u64(priv->nsecs * pkt->skb->len, priv->rate);
if (nft_limit_eval(priv, cost))
regs->verdict.code = NFT_BREAK;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 69 | 98.57% | 1 | 50.00% |
| Liping Zhang | 1 | 1.43% | 1 | 50.00% |
| Total | 70 | 100.00% | 2 | 100.00% |
static int nft_limit_pkt_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);
return nft_limit_init(priv, tb);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 44 | 100.00% | 1 | 100.00% |
| Total | 44 | 100.00% | 1 | 100.00% |
static int nft_limit_pkt_bytes_dump(struct sk_buff *skb,
const struct nft_expr *expr)
{
const struct nft_limit *priv = nft_expr_priv(expr);
return nft_limit_dump(skb, priv, NFT_LIMIT_PKT_BYTES);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 38 | 100.00% | 1 | 100.00% |
| Total | 38 | 100.00% | 1 | 100.00% |
static const struct nft_expr_ops nft_limit_pkt_bytes_ops = {
.type = &nft_limit_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit)),
.eval = nft_limit_pkt_bytes_eval,
.init = nft_limit_pkt_bytes_init,
.dump = nft_limit_pkt_bytes_dump,
};
static const struct nft_expr_ops *
nft_limit_select_ops(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
if (tb[NFTA_LIMIT_TYPE] == NULL)
return &nft_limit_pkts_ops;
switch (ntohl(nla_get_be32(tb[NFTA_LIMIT_TYPE]))) {
case NFT_LIMIT_PKTS:
return &nft_limit_pkts_ops;
case NFT_LIMIT_PKT_BYTES:
return &nft_limit_pkt_bytes_ops;
}
return ERR_PTR(-EOPNOTSUPP);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 72 | 100.00% | 1 | 100.00% |
| Total | 72 | 100.00% | 1 | 100.00% |
static struct nft_expr_type nft_limit_type __read_mostly = {
.name = "limit",
.select_ops = nft_limit_select_ops,
.policy = nft_limit_policy,
.maxattr = NFTA_LIMIT_MAX,
.flags = NFT_EXPR_STATEFUL,
.owner = THIS_MODULE,
};
static int __init nft_limit_module_init(void)
{
return nft_register_expr(&nft_limit_type);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 16 | 100.00% | 2 | 100.00% |
| Total | 16 | 100.00% | 2 | 100.00% |
static void __exit nft_limit_module_exit(void)
{
nft_unregister_expr(&nft_limit_type);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 15 | 100.00% | 2 | 100.00% |
| Total | 15 | 100.00% | 2 | 100.00% |
module_init(nft_limit_module_init);
module_exit(nft_limit_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_EXPR("limit");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 791 | 66.25% | 7 | 50.00% |
| Patrick McHardy | 338 | 28.31% | 3 | 21.43% |
| Andy Zhou | 39 | 3.27% | 1 | 7.14% |
| Liping Zhang | 22 | 1.84% | 2 | 14.29% |
| Nicolas Dichtel | 4 | 0.34% | 1 | 7.14% |
| Total | 1194 | 100.00% | 14 | 100.00% |
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