ipv6: sr: add missing Kbuild export for header files

Add missing IPv6-SR header files in include/uapi/linux/Kbuild.

Also, prevent seg6_lwt_headroom() from being exported and add
missing linux/types.h include.
Signed-off-by: NDavid Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/uapi/linux/Kbuild

@@ -379,6 +379,10 @@ header-y += sctp.h
 header-y += sdla.h
 header-y += seccomp.h
 header-y += securebits.h
+header-y += seg6_genl.h
+header-y += seg6.h
+header-y += seg6_hmac.h
+header-y += seg6_iptunnel.h
 header-y += selinux_netlink.h
 header-y += sem.h
 header-y += serial_core.h

include/uapi/linux/seg6.h

@@ -14,6 +14,8 @@
 #ifndef _UAPI_LINUX_SEG6_H
 #define _UAPI_LINUX_SEG6_H
 
+#include <linux/types.h>
+
 /*
  * SRH
  */

include/uapi/linux/seg6_hmac.h

 #ifndef _UAPI_LINUX_SEG6_HMAC_H
 #define _UAPI_LINUX_SEG6_HMAC_H
 
+#include <linux/types.h>
 #include <linux/seg6.h>
 
 #define SEG6_HMAC_SECRET_LEN	64

include/uapi/linux/seg6_iptunnel.h

@@ -33,6 +33,8 @@ enum {
 	SEG6_IPTUN_MODE_ENCAP,
 };
 
+#ifdef __KERNEL__
+
 static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo)
 {
 	int encap = (tuninfo->mode == SEG6_IPTUN_MODE_ENCAP);
@@ -42,3 +44,5 @@ static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo)
 }
 
 #endif
+
+#endif