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netfilter: nft_quota: add depleted flag for objects

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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>
This commit is contained in:
Pablo Neira Ayuso 2016-11-28 00:05:56 +01:00
parent 2599e98934
commit 1896531710
4 changed files with 32 additions and 8 deletions
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2
include/net/netfilter/nf_tables.h
View File

@ -940,6 +940,7 @@ int nft_verdict_dump(struct sk_buff *skb, int type,
* struct nft_object - nf_tables stateful object
*
* @list: table stateful object list node
* @table: table this object belongs to
* @type: pointer to object type
* @data: pointer to object data
* @name: name of this stateful object
@ -950,6 +951,7 @@ int nft_verdict_dump(struct sk_buff *skb, int type,
struct nft_object {
struct list_head list;
char name[NFT_OBJ_MAXNAMELEN];
struct nft_table *table;
u32 genmask:2,
use:30;
/* runtime data below here */

1
include/uapi/linux/netfilter/nf_tables.h
View File

@ -983,6 +983,7 @@ enum nft_queue_attributes {
enum nft_quota_flags {
NFT_QUOTA_F_INV = (1 << 0),
NFT_QUOTA_F_DEPLETED = (1 << 1),
};
/**

1
net/netfilter/nf_tables_api.c
View File

@ -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);

36
net/netfilter/nft_quota.c
View File

@ -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