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authorPablo Neira Ayuso <pablo@netfilter.org>2015-08-05 12:38:44 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2015-08-07 11:50:50 +0200
commitd2168e849ebf617b2b7feae44c0c0baf739cb610 (patch)
tree7bc6f8c3bab6d1669af7ac6263a606d2b17499fa /net/netfilter
parent8bdf3626425520e9bc55996d5d46f60e12dd3ad7 (diff)
netfilter: nft_limit: add per-byte limiting
This patch adds a new NFTA_LIMIT_TYPE netlink attribute to indicate the type of limiting. Contrary to per-packet limiting, the cost is calculated from the packet path since this depends on the packet length. The burst attribute indicates the number of bytes in which the rate can be exceeded. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nft_limit.c63
1 files changed, 59 insertions, 4 deletions
diff --git a/net/netfilter/nft_limit.c b/net/netfilter/nft_limit.c
index b418698e26b0..5d67938f8b2f 100644
--- a/net/netfilter/nft_limit.c
+++ b/net/netfilter/nft_limit.c
@@ -83,14 +83,16 @@ static int nft_limit_init(struct nft_limit *limit,
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 *limit,
+ enum nft_limit_type type)
{
u64 secs = div_u64(limit->nsecs, NSEC_PER_SEC);
u64 rate = limit->rate - limit->burst;
if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(rate)) ||
nla_put_be64(skb, NFTA_LIMIT_UNIT, cpu_to_be64(secs)) ||
- nla_put_be32(skb, NFTA_LIMIT_BURST, htonl(limit->burst)))
+ nla_put_be32(skb, NFTA_LIMIT_BURST, htonl(limit->burst)) ||
+ nla_put_be32(skb, NFTA_LIMIT_TYPE, htonl(type)))
goto nla_put_failure;
return 0;
@@ -117,6 +119,7 @@ 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 },
};
static int nft_limit_pkts_init(const struct nft_ctx *ctx,
@@ -138,7 +141,7 @@ 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);
+ return nft_limit_dump(skb, &priv->limit, NFT_LIMIT_PKTS);
}
static struct nft_expr_type nft_limit_type;
@@ -150,9 +153,61 @@ static const struct nft_expr_ops nft_limit_pkts_ops = {
.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 = div_u64(priv->nsecs * pkt->skb->len, priv->rate);
+
+ if (nft_limit_eval(priv, cost))
+ regs->verdict.code = NFT_BREAK;
+}
+
+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);
+}
+
+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);
+}
+
+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);
+}
+
static struct nft_expr_type nft_limit_type __read_mostly = {
.name = "limit",
- .ops = &nft_limit_pkts_ops,
+ .select_ops = nft_limit_select_ops,
.policy = nft_limit_policy,
.maxattr = NFTA_LIMIT_MAX,
.flags = NFT_EXPR_STATEFUL,

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