parser: extend limit syntax

The documentation describes the syntax of limit statements thus:

  limit rate [over] packet_number / TIME_UNIT [burst packet_number packets]
  limit rate [over] byte_number BYTE_UNIT / TIME_UNIT [burst byte_number BYTE_UNIT]

  TIME_UNIT := second | minute | hour | day
  BYTE_UNIT := bytes | kbytes | mbytes

From this one might infer that a limit may be specified by any of the
following:

  limit rate 1048576/second
  limit rate 1048576 mbytes/second

  limit rate 1048576 / second
  limit rate 1048576 mbytes / second

However, the last does not currently parse:

  $ sudo /usr/sbin/nft add filter input limit rate 1048576 mbytes / second
  Error: wrong rate format
  add filter input limit rate 1048576 mbytes / second
                   ^^^^^^^^^^^^^^^^^^^^^^^^^

Extend the `limit_rate_bytes` parser rule to support it, and add some
new Python test-cases.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 57 insertions, 0 deletions

diff --git a/tests/py/any/limit.t b/tests/py/any/limit.t
index 0110e77f..86e8d430 100644
--- a/tests/py/any/limit.t
+++ b/tests/py/any/limit.t
@@ -25,6 +25,11 @@ limit rate 10230 mbytes/second;ok
 limit rate 1023000 mbytes/second;ok
 limit rate 512 kbytes/second burst 5 packets;fail
 
+limit rate 1 bytes / second;ok;limit rate 1 bytes/second
+limit rate 1 kbytes / second;ok;limit rate 1 kbytes/second
+limit rate 1 mbytes / second;ok;limit rate 1 mbytes/second
+limit rate 1 gbytes / second;fail
+
 limit rate 1025 bytes/second burst 512 bytes;ok
 limit rate 1025 kbytes/second burst 1023 kbytes;ok
 limit rate 1025 mbytes/second burst 1025 kbytes;ok
diff --git a/tests/py/any/limit.t.json b/tests/py/any/limit.t.json
index 8bab7e3d..b41ae60a 100644
--- a/tests/py/any/limit.t.json
+++ b/tests/py/any/limit.t.json
@@ -125,6 +125,45 @@
     }
 ]
 
+# limit rate 1 bytes / second
+[
+    {
+        "limit": {
+            "burst": 5,
+            "burst_unit": "bytes",
+            "per": "second",
+            "rate": 1,
+            "rate_unit": "bytes"
+        }
+    }
+]
+
+# limit rate 1 kbytes / second
+[
+    {
+        "limit": {
+            "burst": 5,
+            "burst_unit": "bytes",
+            "per": "second",
+            "rate": 1,
+            "rate_unit": "kbytes"
+        }
+    }
+]
+
+# limit rate 1 mbytes / second
+[
+    {
+        "limit": {
+            "burst": 5,
+            "burst_unit": "bytes",
+            "per": "second",
+            "rate": 1,
+            "rate_unit": "mbytes"
+        }
+    }
+]
+
 # limit rate 1025 bytes/second burst 512 bytes
 [
     {
diff --git a/tests/py/any/limit.t.payload b/tests/py/any/limit.t.payload
index dc6cea9b..3bd85f4e 100644
--- a/tests/py/any/limit.t.payload
+++ b/tests/py/any/limit.t.payload
@@ -46,6 +46,19 @@ ip test-ip4 output
 ip test-ip4 output
   [ limit rate 1072693248000/second burst 5 type bytes flags 0x0 ]
 
+# limit rate 1 bytes / second
+ip
+  [ limit rate 1/second burst 5 type bytes flags 0x0 ]
+
+# limit rate 1 kbytes / second
+ip
+  [ limit rate 1024/second burst 5 type bytes flags 0x0 ]
+
+# limit rate 1 mbytes / second
+ip
+  [ limit rate 1048576/second burst 5 type bytes flags 0x0 ]
+
+
 # limit rate 1025 bytes/second burst 512 bytes
 ip test-ip4 output
   [ limit rate 1025/second burst 512 type bytes flags 0x0 ]