ipset: make header files usable from userspace

ipset: make header files usable from userspace

[Jan Engelhardt]

While refreshing iptables's header files with new ones from the
kernel, libxt_SET fails to compile because some definitions were
locked away in __KERNEL__ sections when they should not have been.

This should therefore go into the current -rc.

[PATCH 1/2] netfilter: ipset: avoid use of kernel-only types

[Jan Engelhardt]

When using the xt_set.h header in userspace, one will get these gcc
reports:

ipset/ip_set.h:184:1: error: unknown type name "u16"
In file included from libxt_SET.c:21:0:
netfilter/xt_set.h:61:2: error: unknown type name "u32"
netfilter/xt_set.h:62:2: error: unknown type name "u32"

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
---
 include/linux/netfilter/xt_set.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/netfilter/xt_set.h b/include/linux/netfilter/xt_set.h
index c0405ac..e3a9978 100644
--- a/include/linux/netfilter/xt_set.h
+++ b/include/linux/netfilter/xt_set.h
@@ -58,8 +58,8 @@ struct xt_set_info_target_v1 {
 struct xt_set_info_target_v2 {
 	struct xt_set_info add_set;
 	struct xt_set_info del_set;
-	u32 flags;
-	u32 timeout;
+	__u32 flags;
+	__u32 timeout;
 };
 
 #endif /*_XT_SET_H*/
-- 
1.7.3.4

[PATCH 2/2] netfilter: ipset: expose userspace-relevant parts in ip_set.h

[Jan Engelhardt]

iptables's libxt_SET.c depends on these.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
---
 include/linux/netfilter/ipset/ip_set.h |   22 +++++++++++++---------
 1 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/include/linux/netfilter/ipset/ip_set.h b/include/linux/netfilter/ipset/ip_set.h
index 3540c6e..c5092de 100644
--- a/include/linux/netfilter/ipset/ip_set.h
+++ b/include/linux/netfilter/ipset/ip_set.h
@@ -11,6 +11,8 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/types.h>
+
 /* The protocol version */
 #define IPSET_PROTOCOL		6
 
@@ -168,6 +170,13 @@ enum ipset_adt {
 	IPSET_CADT_MAX,
 };
 
+/* Sets are identified by an index in kernel space. Tweak with ip_set_id_t
+ * and IPSET_INVALID_ID if you want to increase the max number of sets.
+ */
+typedef __u16 ip_set_id_t;
+
+#define IPSET_INVALID_ID		65535
+
 #ifdef __KERNEL__
 #include <linux/ip.h>
 #include <linux/ipv6.h>
@@ -176,13 +185,7 @@ enum ipset_adt {
 #include <linux/netfilter/x_tables.h>
 #include <linux/vmalloc.h>
 #include <net/netlink.h>
-
-/* Sets are identified by an index in kernel space. Tweak with ip_set_id_t
- * and IPSET_INVALID_ID if you want to increase the max number of sets.
- */
-typedef u16 ip_set_id_t;
-
-#define IPSET_INVALID_ID		65535
+#endif /* __KERNEL__ */
 
 enum ip_set_dim {
 	IPSET_DIM_ZERO = 0,
@@ -195,6 +198,7 @@ enum ip_set_dim {
 	IPSET_DIM_MAX = 6,
 };
 
+#ifdef __KERNEL__
 /* Option flags for kernel operations */
 enum ip_set_kopt {
 	IPSET_INV_MATCH = (1 << IPSET_DIM_ZERO),
@@ -450,6 +454,8 @@ bitmap_bytes(u32 a, u32 b)
 	return 4 * ((((b - a + 8) / 8) + 3) / 4);
 }
 
+#endif /* __KERNEL__ */
+
 /* Interface to iptables/ip6tables */
 
 #define SO_IP_SET		83
@@ -475,6 +481,4 @@ struct ip_set_req_version {
 	unsigned version;
 };
 
-#endif	/* __KERNEL__ */
-
 #endif /*_IP_SET_H */
-- 
1.7.3.4

Re: ipset: make header files usable from userspace

[Jozsef Kadlecsik]

Hi Jan,

On Sun, 28 Aug 2011, Jan Engelhardt wrote:
 
> While refreshing iptables's header files with new ones from the
> kernel, libxt_SET fails to compile because some definitions were
> locked away in __KERNEL__ sections when they should not have been.

In the second patch please move the type id and the ip_set_dim enum 
together outside of the __KERNEL__ section. Thus a single #ifdef section
suffices. Thanks!

Best regards,
Jozsef 
-
E-mail  : kadlec@blackhole.kfki.hu, kadlec@mail.kfki.hu
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Address : KFKI Research Institute for Particle and Nuclear Physics
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