[PATCH v6 04/18] netlink: add a basic netlink attribute parser of AF_SMC diag

[JingPiao Chen]

* netlink_sock_diag.c: Include "xlat/smc_diag_attrs.h".
(decode_smc_diag_msg): Use decode_nlattr.
* xlat/smc_diag_attrs.in: New file.
---
 netlink_sock_diag.c    | 11 ++++++++++-
 xlat/smc_diag_attrs.in |  5 +++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 xlat/smc_diag_attrs.in

diff --git a/netlink_sock_diag.c b/netlink_sock_diag.c
index 59d6240..8b5d156 100644
--- a/netlink_sock_diag.c
+++ b/netlink_sock_diag.c
@@ -55,6 +55,7 @@
 #include "xlat/packet_diag_show.h"
 
 #ifdef AF_SMC
+# include "xlat/smc_diag_attrs.h"
 # include "xlat/smc_diag_extended_flags.h"
 # include "xlat/smc_states.h"
 #endif
@@ -527,7 +528,8 @@ decode_smc_diag_msg(struct tcb *const tcp,
 		    const kernel_ulong_t len)
 {
 	struct smc_diag_msg msg = { .diag_family = family };
-	const size_t offset = sizeof(msg.diag_family);
+	size_t offset = sizeof(msg.diag_family);
+	bool decode_nla = false;
 
 	tprints("{diag_family=");
 	printxval(addrfams, msg.diag_family, "AF_???");
@@ -550,11 +552,18 @@ decode_smc_diag_msg(struct tcb *const tcp,
 			print_inet_diag_sockid(&msg.id, AF_INET);
 			tprintf(", diag_uid=%" PRIu32 ", diag_inode=%" PRIu64,
 				msg.diag_uid, msg.diag_inode);
+			decode_nla = true;
 		}
 	} else
 		tprints("...");
 	tprints("}");
 
+	offset = NLA_ALIGN(sizeof(msg));
+	if (decode_nla && len > offset) {
+		tprints(", ");
+		decode_nlattr(tcp, addr + offset, len - offset,
+			      smc_diag_attrs, "SMC_DIAG_???");
+	}
 }
 #endif
 
diff --git a/xlat/smc_diag_attrs.in b/xlat/smc_diag_attrs.in
new file mode 100644
index 0000000..cd6179b
--- /dev/null
+++ b/xlat/smc_diag_attrs.in
@@ -0,0 +1,5 @@
+#unconditional
+SMC_DIAG_NONE
+SMC_DIAG_CONNINFO
+SMC_DIAG_LGRINFO
+SMC_DIAG_SHUTDOWN
-- 
2.7.4