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authorPablo Neira Ayuso <pablo@netfilter.org>2016-11-28 00:05:56 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2016-12-07 13:22:12 +0100
commit1896531710abcd9a961a17d0c5c6a9f537d479b6 (patch)
tree8b8f03d79699e607ab0dfa3e9abf0a9e5404e477 /net
parent2599e98934c5ad166ad184b3682e38aadcb63fb3 (diff)
netfilter: nft_quota: add depleted flag for objects
Notify on depleted quota objects. The NFT_QUOTA_F_DEPLETED flag indicates we have reached overquota. Add pointer to table from nft_object, so we can use it when sending the depletion notification to userspace. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_tables_api.c1
-rw-r--r--net/netfilter/nft_quota.c36
2 files changed, 29 insertions, 8 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 9d2ed3f520ef..c5419701ca79 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4075,6 +4075,7 @@ static int nf_tables_newobj(struct net *net, struct sock *nlsk,
err = PTR_ERR(obj);
goto err1;
}
+ obj->table = table;
nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
diff --git a/net/netfilter/nft_quota.c b/net/netfilter/nft_quota.c
index 5d25f57497cb..7f27ebdce7ab 100644
--- a/net/netfilter/nft_quota.c
+++ b/net/netfilter/nft_quota.c
@@ -17,7 +17,7 @@
struct nft_quota {
u64 quota;
- bool invert;
+ unsigned long flags;
atomic64_t consumed;
};
@@ -27,11 +27,16 @@ static inline bool nft_overquota(struct nft_quota *priv,
return atomic64_add_return(skb->len, &priv->consumed) >= priv->quota;
}
+static inline bool nft_quota_invert(struct nft_quota *priv)
+{
+ return priv->flags & NFT_QUOTA_F_INV;
+}
+
static inline void nft_quota_do_eval(struct nft_quota *priv,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
- if (nft_overquota(priv, pkt->skb) ^ priv->invert)
+ if (nft_overquota(priv, pkt->skb) ^ nft_quota_invert(priv))
regs->verdict.code = NFT_BREAK;
}
@@ -40,19 +45,29 @@ static const struct nla_policy nft_quota_policy[NFTA_QUOTA_MAX + 1] = {
[NFTA_QUOTA_FLAGS] = { .type = NLA_U32 },
};
+#define NFT_QUOTA_DEPLETED_BIT 1 /* From NFT_QUOTA_F_DEPLETED. */
+
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);
+ bool overquota;
- nft_quota_do_eval(priv, regs, pkt);
+ overquota = nft_overquota(priv, pkt->skb);
+ if (overquota ^ nft_quota_invert(priv))
+ regs->verdict.code = NFT_BREAK;
+
+ if (overquota &&
+ !test_and_set_bit(NFT_QUOTA_DEPLETED_BIT, &priv->flags))
+ nft_obj_notify(nft_net(pkt), obj->table, obj, 0, 0,
+ NFT_MSG_NEWOBJ, nft_pf(pkt), 0, GFP_ATOMIC);
}
static int nft_quota_do_init(const struct nlattr * const tb[],
struct nft_quota *priv)
{
- u32 flags = 0;
+ unsigned long flags = 0;
u64 quota;
if (!tb[NFTA_QUOTA_BYTES])
@@ -66,10 +81,12 @@ static int nft_quota_do_init(const struct nlattr * const tb[],
flags = ntohl(nla_get_be32(tb[NFTA_QUOTA_FLAGS]));
if (flags & ~NFT_QUOTA_F_INV)
return -EINVAL;
+ if (flags & NFT_QUOTA_F_DEPLETED)
+ return -EOPNOTSUPP;
}
priv->quota = quota;
- priv->invert = (flags & NFT_QUOTA_F_INV) ? true : false;
+ priv->flags = flags;
atomic64_set(&priv->consumed, 0);
return 0;
@@ -86,13 +103,16 @@ static int nft_quota_obj_init(const struct nlattr * const tb[],
static int nft_quota_do_dump(struct sk_buff *skb, struct nft_quota *priv,
bool reset)
{
- u32 flags = priv->invert ? NFT_QUOTA_F_INV : 0;
+ u32 flags = priv->flags;
u64 consumed;
- if (reset)
+ if (reset) {
consumed = atomic64_xchg(&priv->consumed, 0);
- else
+ if (test_and_clear_bit(NFT_QUOTA_DEPLETED_BIT, &priv->flags))
+ flags |= NFT_QUOTA_F_DEPLETED;
+ } else {
consumed = atomic64_read(&priv->consumed);
+ }
/* Since we inconditionally increment consumed quota for each packet
* that we see, don't go over the quota boundary in what we send to