If we can't translate an interface index back to a name
we just print the number.

This change allows using a number instead of an interface index to
make this symmetric.

If we can't find an interface with the given name check
if its a numeric string and then use it instead.

Signed-off-by: Florian Westphal <f...@strlen.de>
---
 src/meta.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/meta.c b/src/meta.c
index 87eafeead389..34f9ee8e36e2 100644
--- a/src/meta.c
+++ b/src/meta.c
@@ -11,6 +11,7 @@
  */
 
 #include <errno.h>
+#include <limits.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -166,8 +167,18 @@ static struct error_record *ifindex_type_parse(const 
struct expr *sym,
        int ifindex;
 
        ifindex = nft_if_nametoindex(sym->identifier);
-       if (ifindex == 0)
-               return error(&sym->location, "Interface does not exist");
+       if (ifindex == 0) {
+               char *end;
+               long res;
+
+               errno = 0;
+               res = strtol(sym->identifier, &end, 10);
+
+               if (res < 0 || res > INT_MAX || *end || errno)
+                       return error(&sym->location, "Interface does not 
exist");
+
+               ifindex = (int)res;
+       }
 
        *res = constant_expr_alloc(&sym->location, sym->dtype,
                                   BYTEORDER_HOST_ENDIAN,
-- 
2.7.3

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