netfilter: ipset: set match: add support to match the counters

The new revision of the set match supports to match the counters
and to suppress updating the counters at matching too.

At the set:list types, the updating of the subcounters can be
suppressed as well.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 77 insertions, 3 deletions

diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index f6d878a46c43..f77139007983 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -413,7 +413,7 @@ ip_set_test(ip_set_id_t index, const struct sk_buff *skb,
 		ret = 1;
 	} else {
 		/* --return-nomatch: invert matched element */
-		if ((opt->flags & IPSET_RETURN_NOMATCH) &&
+		if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) &&
 		    (set->type->features & IPSET_TYPE_NOMATCH) &&
 		    (ret > 0 || ret == -ENOTEMPTY))
 			ret = -ret;
diff --git a/net/netfilter/ipset/ip_set_list_set.c b/net/netfilter/ipset/ip_set_list_set.c
index c09022e37406..979b8c90e422 100644
--- a/net/netfilter/ipset/ip_set_list_set.c
+++ b/net/netfilter/ipset/ip_set_list_set.c
@@ -84,9 +84,13 @@ list_set_ktest(struct ip_set *set, const struct sk_buff *skb,
 {
 	struct list_set *map = set->data;
 	struct set_elem *e;
-	u32 i;
+	u32 i, cmdflags = opt->cmdflags;
 	int ret;
 
+	/* Don't lookup sub-counters at all */
+	opt->cmdflags &= ~IPSET_FLAG_MATCH_COUNTERS;
+	if (opt->cmdflags & IPSET_FLAG_SKIP_SUBCOUNTER_UPDATE)
+		opt->cmdflags &= ~IPSET_FLAG_SKIP_COUNTER_UPDATE;
 	for (i = 0; i < map->size; i++) {
 		e = list_set_elem(map, i);
 		if (e->id == IPSET_INVALID_ID)
@@ -99,7 +103,7 @@ list_set_ktest(struct ip_set *set, const struct sk_buff *skb,
 			if (SET_WITH_COUNTER(set))
 				ip_set_update_counter(ext_counter(e, map),
 						      ext, &opt->ext,
-						      opt->cmdflags);
+						      cmdflags);
 			return ret;
 		}
 	}
diff --git a/net/netfilter/xt_set.c b/net/netfilter/xt_set.c
index 636c5199ff35..31790e789e22 100644
--- a/net/netfilter/xt_set.c
+++ b/net/netfilter/xt_set.c
@@ -189,6 +189,9 @@ set_match_v1(const struct sk_buff *skb, struct xt_action_param *par)
 	ADT_OPT(opt, par->family, info->match_set.dim,
 		info->match_set.flags, 0, UINT_MAX);
 
+	if (opt.flags & IPSET_RETURN_NOMATCH)
+		opt.cmdflags |= IPSET_FLAG_RETURN_NOMATCH;
+
 	return match_set(info->match_set.index, skb, par, &opt,
 			 info->match_set.flags & IPSET_INV_MATCH);
 }
@@ -317,6 +320,52 @@ set_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
 #define set_target_v2_checkentry	set_target_v1_checkentry
 #define set_target_v2_destroy		set_target_v1_destroy
 
+/* Revision 3 match */
+
+static bool
+match_counter(u64 counter, const struct ip_set_counter_match *info)
+{
+	switch (info->op) {
+	case IPSET_COUNTER_NONE:
+		return true;
+	case IPSET_COUNTER_EQ:
+		return counter == info->value;
+	case IPSET_COUNTER_NE:
+		return counter != info->value;
+	case IPSET_COUNTER_LT:
+		return counter < info->value;
+	case IPSET_COUNTER_GT:
+		return counter > info->value;
+	}
+	return false;
+}
+
+static bool
+set_match_v3(const struct sk_buff *skb, struct xt_action_param *par)
+{
+	const struct xt_set_info_match_v3 *info = par->matchinfo;
+	ADT_OPT(opt, par->family, info->match_set.dim,
+		info->match_set.flags, info->flags, UINT_MAX);
+	int ret;
+
+	if (info->packets.op != IPSET_COUNTER_NONE ||
+	    info->bytes.op != IPSET_COUNTER_NONE)
+		opt.cmdflags |= IPSET_FLAG_MATCH_COUNTERS;
+
+	ret = match_set(info->match_set.index, skb, par, &opt,
+			info->match_set.flags & IPSET_INV_MATCH);
+
+	if (!(ret && opt.cmdflags & IPSET_FLAG_MATCH_COUNTERS))
+		return ret;
+
+	if (!match_counter(opt.ext.packets, &info->packets))
+		return 0;
+	return match_counter(opt.ext.bytes, &info->bytes);
+}
+
+#define set_match_v3_checkentry	set_match_v1_checkentry
+#define set_match_v3_destroy	set_match_v1_destroy
+
 static struct xt_match set_matches[] __read_mostly = {
 	{
 		.name		= "set",
@@ -369,6 +418,27 @@ static struct xt_match set_matches[] __read_mostly = {
 		.destroy	= set_match_v1_destroy,
 		.me		= THIS_MODULE
 	},
+	/* counters support: update, match */
+	{
+		.name		= "set",
+		.family		= NFPROTO_IPV4,
+		.revision	= 3,
+		.match		= set_match_v3,
+		.matchsize	= sizeof(struct xt_set_info_match_v3),
+		.checkentry	= set_match_v3_checkentry,
+		.destroy	= set_match_v3_destroy,
+		.me		= THIS_MODULE
+	},
+	{
+		.name		= "set",
+		.family		= NFPROTO_IPV6,
+		.revision	= 3,
+		.match		= set_match_v3,
+		.matchsize	= sizeof(struct xt_set_info_match_v3),
+		.checkentry	= set_match_v3_checkentry,
+		.destroy	= set_match_v3_destroy,
+		.me		= THIS_MODULE
+	},
 };
 
 static struct xt_target set_targets[] __read_mostly = {