headers: update for compatibility with toolchain headers down to 5.15

Found that many distro build toolchains use outdated kernel headers.
Explicitly add linux/if.h to mctp-ops-test.c, and add missing
linux/mctp.h definitions if undefined.

Signed-off-by: James Lee <james@codeconstruct.com.au>

Author: SafetyInObscurity

src/mctp.h

@@ -109,4 +109,29 @@ enum {
 #define RTNLGRP_MCTP_IFADDR 34
 #endif
 
+#ifndef SIOCMCTPALLOCTAG
+#define SIOCMCTPALLOCTAG 0x89E0
+#define SIOCMCTPDROPTAG (0x89E0 + 1)
+
+struct mctp_ioc_tag_ctl {
+	mctp_eid_t peer_addr;
+
+	__u8 tag;
+	__u16 flags;
+};
+#endif
+
+#ifndef SIOCMCTPALLOCTAG2
+#define SIOCMCTPALLOCTAG2 (0x89E0 + 2)
+#define SIOCMCTPDROPTAG2 (0x89E0 + 3)
+
+struct mctp_ioc_tag_ctl2 {
+	unsigned int net;
+	mctp_eid_t peer_addr;
+	mctp_eid_t local_addr;
+	__u16 flags;
+	__u8 tag;
+};
+#endif
+
 #endif /* _MCTP_H */

tests/mctp-ops-test.c

@@ -20,6 +20,7 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 
+#include <linux/if.h>
 #include <linux/netlink.h>
 
 #include "mctp-ops.h"