rtnl_rule: decode fib_rule_hdr netlink attributes

* configure.ac (AC_CHECK_FUNCS): Add be64toh.
(AC_CHECK_TYPES): Check for struct fib_rule_uid_range
in <linux/fib_rules.h>.
* nlattr.c: Include <endian.h>.
(decode_nla_be64): New function.
* nlattr.h (decode_nla_be64): New prototype.
* rtnl_rule.c (decode_rule_addr,
decode_fib_rule_uid_range): New functions.
(fib_rule_hdr_nla_decoders): New array.
(decode_fib_rule_hdr): Use it.

1 files changed, 21 insertions, 0 deletions

diff --git a/nlattr.c b/nlattr.c
index 76010c446..847fa3935 100644
--- a/nlattr.c
+++ b/nlattr.c
@@ -28,6 +28,7 @@
  */
 
 #include "defs.h"
+#include <endian.h>
 #include "netlink.h"
 #include "nlattr.h"
 #include <linux/sock_diag.h>
@@ -220,6 +221,26 @@ decode_nla_ifindex(struct tcb *const tcp,
 	return true;
 }
 
+bool
+decode_nla_be64(struct tcb *const tcp,
+		const kernel_ulong_t addr,
+		const unsigned int len,
+		const void *const opaque_data)
+{
+#if defined HAVE_BE64TOH || defined be64toh
+	uint64_t num;
+
+	if (len < sizeof(num))
+		return false;
+	else if (!umove_or_printaddr(tcp, addr, &num))
+		tprintf("htobe64(%" PRIu64 ")", be64toh(num));
+
+	return true;
+#else
+	return false;
+#endif
+}
+
 #define DECODE_NLA_INTEGER(name, type, fmt)		\
 bool							\
 decode_nla_ ## name(struct tcb *const tcp,		\