improve Ethernet proto error message

diff --git a/ebtables.c b/ebtables.c
index 266ed8e..1e87fe3 100644 (file)
--- a/ebtables.c
+++ b/ebtables.c
@@ -470,6 +470,8 @@ static void parse_iface(char *iface, char *option)
 
 #define print_if_l_error ebt_print_error("Interface name length must be less " \
    "than %d", IFNAMSIZ)
+#define print_epoto_error(__proto) ebt_print_error("Problem with the specified"\
+   " Ethernet protocol (%s), perhaps "_PATH_ETHERTYPES " is missing", __proto);
 #define OPT_COMMAND    0x01
 #define OPT_TABLE      0x02
 #define OPT_IN         0x04
@@ -964,8 +966,7 @@ handle_P:
                                }
                                ent = getethertypebyname(argv[optind - 1]);
                                if (!ent)
-                                       ebt_print_error("Problem with the "
-                                                       "specified protocol");
+                                       print_epoto_error(argv[optind - 1]);
                                new_entry->ethproto = ent->e_ethertype;
                        }
                        if (new_entry->ethproto < 1536 &&