payload: do not kill dependency for proto_unknown

Unsupported meta match on layer 4 protocol sets on protocol context to
proto_unknown, handle anything coming after it as a raw expression in
payload_expr_expand().

Moreover, payload_dependency_kill() skips dependency removal if protocol
is unknown, so raw payload expression leaves meta layer 4 protocol
remains in place.

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1641
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 41 insertions, 0 deletions

diff --git a/tests/py/any/rawpayload.t b/tests/py/any/rawpayload.t
index 128e8088..5bc9d35f 100644
--- a/tests/py/any/rawpayload.t
+++ b/tests/py/any/rawpayload.t
@@ -19,4 +19,6 @@ meta l4proto tcp @th,16,16 { 22, 23, 80};ok;tcp dport { 22, 23, 80}
 @ll,0,8 & 0x80 == 0x80;ok
 @ll,0,128 0xfedcba987654321001234567890abcde;ok
 
+meta l4proto 91 @th,400,16 0x0 accept;ok
+
 @ih,32,32 0x14000000;ok
diff --git a/tests/py/any/rawpayload.t.json b/tests/py/any/rawpayload.t.json
index b5115e0d..4cae4d49 100644
--- a/tests/py/any/rawpayload.t.json
+++ b/tests/py/any/rawpayload.t.json
@@ -156,6 +156,37 @@
     }
 ]
 
+# meta l4proto 91 @th,400,16 0x0 accept
+[
+    {
+        "match": {
+            "left": {
+                "meta": {
+                    "key": "l4proto"
+                }
+            },
+            "op": "==",
+            "right": 91
+        }
+    },
+    {
+        "match": {
+            "left": {
+                "payload": {
+                    "base": "th",
+                    "len": 16,
+                    "offset": 400
+                }
+            },
+            "op": "==",
+            "right": 0
+        }
+    },
+    {
+        "accept": null
+    }
+]
+
 # @ih,32,32 0x14000000
 [
     {
diff --git a/tests/py/any/rawpayload.t.payload b/tests/py/any/rawpayload.t.payload
index 61c41cb9..fe2377e6 100644
--- a/tests/py/any/rawpayload.t.payload
+++ b/tests/py/any/rawpayload.t.payload
@@ -48,6 +48,14 @@ inet test-inet input
   [ payload load 16b @ link header + 0 => reg 1 ]
   [ cmp eq reg 1 0x98badcfe 0x10325476 0x67452301 0xdebc0a89 ]
 
+# meta l4proto 91 @th,400,16 0x0 accept
+inet test-inet input
+  [ meta load l4proto => reg 1 ]
+  [ cmp eq reg 1 0x0000005b ]
+  [ payload load 2b @ transport header + 50 => reg 1 ]
+  [ cmp eq reg 1 0x00000000 ]
+  [ immediate reg 0 accept ]
+
 # @ih,32,32 0x14000000
 inet test-inet input
   [ payload load 4b @ inner header + 4 => reg 1 ]