groups: add attribute group API

This new API allows you to set and get some logical set of
attributes. This is not intended to replace the existing
per-attribute get/set API but to provide more efficient way
to get/set certain attributes. This change includes an example
file (conntrack_grp_create.c) of the use of the attribute group API.

See ATTR_GRP_* for more information on the existing groups.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/include/internal/bitops.h b/include/internal/bitops.h
index b1bd848..0c1fde8 100644
--- a/include/internal/bitops.h
+++ b/include/internal/bitops.h
@@ -24,9 +24,40 @@ static inline void unset_bit_u16(int nr, u_int16_t *addr)
 	addr[nr >> 4] &= ~(1UL << (nr & 15));
 }
 
+static inline void
+set_bitmask_u32(u_int32_t *buf1, const u_int32_t *buf2, int len)
+{
+	int i;
+
+	for (i=0; i<len; i++)
+		buf1[i] |= buf2[i];
+}
+
+static inline void
+unset_bitmask_u32(u_int32_t *buf1, const u_int32_t *buf2, int len)
+{
+	int i;
+
+	for (i=0; i<len; i++)
+		buf1[i] &= ~buf2[i];
+}
+
 static inline int test_bit(int nr, const u_int32_t *addr)
 {
 	return ((1UL << (nr & 31)) & (addr[nr >> 5])) != 0;
 }
 
+static inline int 
+test_bitmask_u32(const uint32_t *buf1, const uint32_t *buf2, int len)
+{
+	int i;
+
+	for (i=0; i<len; i++) {
+		if ((buf1[i] & buf2[i]) != buf2[i]) {
+			return 0;
+		}
+	}
+	return 1;
+}
+
 #endif