netlink: display scope value in debug

add functions to convert scope value from int to string and back. put
them to use to display address scope in debug output.

3 files changed, 53 insertions, 0 deletions

diff --git a/zebra/connected.c b/zebra/connected.c
index bf5715e4..25186a80 100644
--- a/zebra/connected.c
+++ b/zebra/connected.c
@@ -36,6 +36,53 @@
 #include "zebra/interface.h"
 #include "zebra/connected.h"
 extern struct zebra_t zebrad;
+
+#ifdef HAVE_NETLINK
+static const struct message rtscope_str[] = {
+  {RT_SCOPE_UNIVERSE,	"global"},
+  {RT_SCOPE_SITE,	"site"},
+  {RT_SCOPE_LINK,	"link"},
+  {RT_SCOPE_HOST,	"host"},
+  {RT_SCOPE_NOWHERE,	"nowhere"},
+  {0, NULL}
+};
+
+/* for use in show interface */
+const char *
+connected_scope_name(unsigned value)
+{
+  const char *str;
+  static char buf[16];
+
+  str = lookup (rtscope_str, value);
+  if (!str || !*str) {
+    snprintf (buf, sizeof(buf), "%d", value);
+    str = buf;
+  }
+  return str;
+}
+
+int
+connected_scope_number(const char *name)
+{
+  const struct message *m;
+  char *errptr;
+  unsigned value;
+
+  if (!name || !*name)
+    return -1;
+
+  for (m = rtscope_str; m->str; m++)
+    if (!strcmp (m->str, name))
+      return m->key;
+
+  value = strtoul (name, &errptr, 0);
+  if (*errptr || value > 255)
+    return -1;
+
+  return value;
+}
+#endif /* HAVE_NETLINK */
 
 /* withdraw a connected address */
 static void
diff --git a/zebra/connected.h b/zebra/connected.h
index 0f7c586b..d7934055 100644
--- a/zebra/connected.h
+++ b/zebra/connected.h
@@ -54,4 +54,9 @@ extern void connected_down_ipv6 (struct interface *ifp, struct connected *);
 
 #endif /* HAVE_IPV6 */
 
+#ifdef HAVE_NETLINK
+extern const char *connected_scope_name (unsigned value);
+extern int connected_scope_number (const char *name);
+#endif /* HAVE_NETLINK */
+
 #endif /*_ZEBRA_CONNECTED_H */
diff --git a/zebra/rt_netlink.c b/zebra/rt_netlink.c
index dfe88002..da255e0f 100644
--- a/zebra/rt_netlink.c
+++ b/zebra/rt_netlink.c
@@ -549,6 +549,7 @@ netlink_interface_addr (struct sockaddr_nl *snl, struct nlmsghdr *h)
       char buf[BUFSIZ];
       zlog_debug ("netlink_interface_addr %s %s:",
                  lookup (nlmsg_str, h->nlmsg_type), ifp->name);
+      zlog_debug ("  ifa_scope     %s", connected_scope_name (ifa->ifa_scope));
       if (tb[IFA_LOCAL])
         zlog_debug ("  IFA_LOCAL     %s/%d",
 		    inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_LOCAL]),