include: don't include kernel headers in public libnl3 headers

It would be desirable not to include kernel headers in our public
libnl3 headers. As a test, remove all those includes, and fix
compilation by explicitly including the kernel headers where needed.
In some cases, that requires forward declaration for kernel
structures, as we use them as part of our own headers.

Realistically, we cannot drop those includes as it probalby breaks
compilation for users that expect to get a certain kernel header
when including a libnl3 header. So, this will not be done and the
includes will be restored in the next commit.

Do this step to show how it would be and to verify that we could
build with such a change. The reason not to do this is backward
compatibility (at compile-time).

18 files changed, 42 insertions, 2 deletions

diff --git a/tests/check-attr.c b/tests/check-attr.c
index d862230..0390997 100644
--- a/tests/check-attr.c
+++ b/tests/check-attr.c
@@ -13,6 +13,8 @@
 #include <netlink/attr.h>
 #include <netlink/msg.h>
 
+#include <linux/netlink.h>
+
 START_TEST(attr_size)
 {
 	fail_if(nla_attr_size(0) != NLA_HDRLEN,
diff --git a/tests/test-cache-mngr.c b/tests/test-cache-mngr.c
index 8999e58..9761452 100644
--- a/tests/test-cache-mngr.c
+++ b/tests/test-cache-mngr.c
@@ -5,6 +5,8 @@
 
 #include <netlink-private/cache-api.h>
 
+#include <linux/netlink.h>
+
 static int quit = 0;
 
 static struct nl_dump_params dp = {
diff --git a/tests/test-complex-HTB-with-hash-filters.c b/tests/test-complex-HTB-with-hash-filters.c
index 453f801..c2ac783 100644
--- a/tests/test-complex-HTB-with-hash-filters.c
+++ b/tests/test-complex-HTB-with-hash-filters.c
@@ -18,6 +18,7 @@
 #include <netlink/route/classifier.h>
 #include <netlink/route/class.h>
 #include <linux/if_ether.h>
+#include <linux/pkt_cls.h>
 
 #include <netlink/attr.h>
 //#include "include/rtnl_u32.h"
@@ -26,6 +27,8 @@
 #include <string.h>
 //#include "include/rtnl_u32_addon.h"
 
+#include <linux/netlink.h>
+
 #define 	TC_HANDLE(maj, min)   (TC_H_MAJ((maj) << 16) | TC_H_MIN(min))
 
 /* some functions are copied from iproute-tc tool */
diff --git a/tests/test-create-bond.c b/tests/test-create-bond.c
index 11bc5b0..326e0ef 100644
--- a/tests/test-create-bond.c
+++ b/tests/test-create-bond.c
@@ -2,6 +2,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/bonding.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-create-bridge.c b/tests/test-create-bridge.c
index c4bec37..fe10c63 100644
--- a/tests/test-create-bridge.c
+++ b/tests/test-create-bridge.c
@@ -2,6 +2,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/bridge.h>
 
+#include <linux/netlink.h>
+
 #define TEST_BRIDGE_NAME "testbridge"
 #define TEST_INTERFACE_NAME "testtap1"
 
diff --git a/tests/test-create-ifb.c b/tests/test-create-ifb.c
index 99336f5..d154ffd 100644
--- a/tests/test-create-ifb.c
+++ b/tests/test-create-ifb.c
@@ -1,6 +1,8 @@
 #include <netlink/netlink.h>
 #include <netlink/route/link.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-create-ipvlan.c b/tests/test-create-ipvlan.c
index dd61b80..50bac54 100644
--- a/tests/test-create-ipvlan.c
+++ b/tests/test-create-ipvlan.c
@@ -2,6 +2,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/ipvlan.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-create-macsec.c b/tests/test-create-macsec.c
index abdb7f6..efadf6b 100644
--- a/tests/test-create-macsec.c
+++ b/tests/test-create-macsec.c
@@ -1,5 +1,9 @@
 #include <netlink/netlink.h>
 #include <netlink/route/link.h>
+
+#include <linux/netlink.h>
+#include <linux/if_link.h>
+
 #include <netlink/route/link/macsec.h>
 
 int main(int argc, char *argv[])
diff --git a/tests/test-create-macvlan.c b/tests/test-create-macvlan.c
index d94839b..f520b67 100644
--- a/tests/test-create-macvlan.c
+++ b/tests/test-create-macvlan.c
@@ -4,6 +4,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/macvlan.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-create-macvtap.c b/tests/test-create-macvtap.c
index dc7df95..27d1969 100644
--- a/tests/test-create-macvtap.c
+++ b/tests/test-create-macvtap.c
@@ -4,6 +4,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/macvtap.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-create-veth.c b/tests/test-create-veth.c
index db5ab8b..9600f8d 100644
--- a/tests/test-create-veth.c
+++ b/tests/test-create-veth.c
@@ -2,6 +2,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/veth.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-create-vlan.c b/tests/test-create-vlan.c
index 64e478f..04756d4 100644
--- a/tests/test-create-vlan.c
+++ b/tests/test-create-vlan.c
@@ -2,6 +2,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/vlan.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-create-vrf.c b/tests/test-create-vrf.c
index 7db6d8a..c3d23e7 100644
--- a/tests/test-create-vrf.c
+++ b/tests/test-create-vrf.c
@@ -2,6 +2,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/vrf.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct nl_cache *link_cache;
diff --git a/tests/test-create-vxlan.c b/tests/test-create-vxlan.c
index 98a5103..855fdb5 100644
--- a/tests/test-create-vxlan.c
+++ b/tests/test-create-vxlan.c
@@ -2,6 +2,8 @@
 #include <netlink/route/link.h>
 #include <netlink/route/link/vxlan.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-delete-link.c b/tests/test-delete-link.c
index 9cf1034..8633123 100644
--- a/tests/test-delete-link.c
+++ b/tests/test-delete-link.c
@@ -1,6 +1,8 @@
 #include <netlink/netlink.h>
 #include <netlink/route/link.h>
 
+#include <linux/netlink.h>
+
 int main(int argc, char *argv[])
 {
 	struct rtnl_link *link;
diff --git a/tests/test-genl.c b/tests/test-genl.c
index 74aea10..d96dadd 100644
--- a/tests/test-genl.c
+++ b/tests/test-genl.c
@@ -1,5 +1,7 @@
 #include <netlink/cli/utils.h>
+
 #include <linux/taskstats.h>
+#include <linux/genetlink.h>
 
 static struct nla_policy attr_policy[TASKSTATS_TYPE_MAX+1] = {
 	[TASKSTATS_TYPE_PID]	= { .type = NLA_U32 },
diff --git a/tests/test-nf-cache-mngr.c b/tests/test-nf-cache-mngr.c
index b4f3022..7625e3f 100644
--- a/tests/test-nf-cache-mngr.c
+++ b/tests/test-nf-cache-mngr.c
@@ -1,5 +1,7 @@
 #include <netlink/cli/utils.h>
 
+#include <linux/netlink.h>
+
 static void change_cb(struct nl_cache *cache, struct nl_object *obj,
 		      int action, void *data)
 {
diff --git a/tests/test-u32-filter-with-actions.c b/tests/test-u32-filter-with-actions.c
index 70bab4d..0ca216c 100644
--- a/tests/test-u32-filter-with-actions.c
+++ b/tests/test-u32-filter-with-actions.c
@@ -20,12 +20,15 @@
 #include <netlink/route/act/mirred.h>
 #include <netlink/route/act/skbedit.h>
 #include <netlink/route/class.h>
-#include <linux/if_ether.h>
-
 #include <netlink/attr.h>
+
 #include <stdio.h>
 #include <string.h>
 
+#include <linux/if_ether.h>
+#include <linux/tc_act/tc_mirred.h>
+#include <linux/netlink.h>
+
 #define 	TC_HANDLE(maj, min)   (TC_H_MAJ((maj) << 16) | TC_H_MIN(min))
 
 /* some functions are copied from iproute-tc tool */