netlink: add basic decoding of NETLINK_ROUTE rtgenmsg attributes

* rtnl_nsid.c: Include "nlattr.h" and "xlat/rtnl_nsid_attrs.h".
(decode_rtgenmsg): Call decode_nlattr.
* xlat/rtnl_nsid_attrs.in: New file.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

diff --git a/rtnl_nsid.c b/rtnl_nsid.c
index de2878808f8119e7f69fcfa163784379e4339647..e3fe18b6c571ccee2dde1a1177849ffee8fa4894 100644 (file)
--- a/rtnl_nsid.c
+++ b/rtnl_nsid.c
@@ -29,15 +29,25 @@
 
 #include "defs.h"
 #include "netlink_route.h"
+#include "nlattr.h"
 #include "print_fields.h"
 
 #include "netlink.h"
 #include <linux/rtnetlink.h>
 
+#include "xlat/rtnl_nsid_attrs.h"
+
 DECL_NETLINK_ROUTE_DECODER(decode_rtgenmsg)
 {
        struct rtgenmsg rtgenmsg = { .rtgen_family = family };
 
        PRINT_FIELD_XVAL("{", rtgenmsg, rtgen_family, addrfams, "AF_???");
        tprints("}");
+
+       const size_t offset = NLMSG_ALIGN(sizeof(rtgenmsg));
+       if (len > offset) {
+               tprints(", ");
+               decode_nlattr(tcp, addr + offset, len - offset,
+                             rtnl_nsid_attrs, "NETNSA_???", NULL, 0, NULL);
+       }
 }

diff --git a/xlat/rtnl_nsid_attrs.in b/xlat/rtnl_nsid_attrs.in
new file mode 100644 (file)
index 0000000..f5b01bf
--- /dev/null
+++ b/xlat/rtnl_nsid_attrs.in
@@ -0,0 +1,5 @@
+NETNSA_NSID_NOT_ASSIGNED       -1
+NETNSA_NONE                    0
+NETNSA_NSID                    1
+NETNSA_PID                     2
+NETNSA_FD                      3