exthdr: Implement SCTP Chunk matching

Extend exthdr expression to support scanning through SCTP packet chunks
and matching on fixed fields' values.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Florian Westphal <fw@strlen.de>

1 files changed, 478 insertions, 0 deletions

diff --git a/tests/py/inet/sctp.t.json b/tests/py/inet/sctp.t.json
index 2684b034..81356862 100644
--- a/tests/py/inet/sctp.t.json
+++ b/tests/py/inet/sctp.t.json
@@ -608,3 +608,481 @@
     }
 ]
 
+# sctp chunk data exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "data"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk init exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "init"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk init-ack exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "init-ack"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk sack exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "sack"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk heartbeat exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "heartbeat"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk heartbeat-ack exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "heartbeat-ack"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk abort exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "abort"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk shutdown exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "shutdown"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk shutdown-ack exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "shutdown-ack"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk error exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "error"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk cookie-echo exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "cookie-echo"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk cookie-ack exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "cookie-ack"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk ecne exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "ecne"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk cwr exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "cwr"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk shutdown-complete exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "shutdown-complete"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk asconf-ack exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "asconf-ack"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk forward-tsn exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "forward-tsn"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk asconf exists
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "name": "asconf"
+                }
+            },
+            "op": "==",
+            "right": true
+        }
+    }
+]
+
+# sctp chunk data type 0
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "type",
+                    "name": "data"
+                }
+            },
+            "op": "==",
+            "right": 0
+        }
+    }
+]
+
+# sctp chunk init flags 23
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "flags",
+                    "name": "init"
+                }
+            },
+            "op": "==",
+            "right": 23
+        }
+    }
+]
+
+# sctp chunk init-ack length 42
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "length",
+                    "name": "init-ack"
+                }
+            },
+            "op": "==",
+            "right": 42
+        }
+    }
+]
+
+# sctp chunk data stream 1337
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "stream",
+                    "name": "data"
+                }
+            },
+            "op": "==",
+            "right": 1337
+        }
+    }
+]
+
+# sctp chunk init initial-tsn 5
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "initial-tsn",
+                    "name": "init"
+                }
+            },
+            "op": "==",
+            "right": 5
+        }
+    }
+]
+
+# sctp chunk init-ack num-outbound-streams 3
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "num-outbound-streams",
+                    "name": "init-ack"
+                }
+            },
+            "op": "==",
+            "right": 3
+        }
+    }
+]
+
+# sctp chunk sack a-rwnd 1
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "a-rwnd",
+                    "name": "sack"
+                }
+            },
+            "op": "==",
+            "right": 1
+        }
+    }
+]
+
+# sctp chunk shutdown cum-tsn-ack 65535
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "cum-tsn-ack",
+                    "name": "shutdown"
+                }
+            },
+            "op": "==",
+            "right": 65535
+        }
+    }
+]
+
+# sctp chunk ecne lowest-tsn 5
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "lowest-tsn",
+                    "name": "ecne"
+                }
+            },
+            "op": "==",
+            "right": 5
+        }
+    }
+]
+
+# sctp chunk cwr lowest-tsn 8
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "lowest-tsn",
+                    "name": "cwr"
+                }
+            },
+            "op": "==",
+            "right": 8
+        }
+    }
+]
+
+# sctp chunk asconf-ack seqno 12345
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "seqno",
+                    "name": "asconf-ack"
+                }
+            },
+            "op": "==",
+            "right": 12345
+        }
+    }
+]
+
+# sctp chunk forward-tsn new-cum-tsn 31337
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "new-cum-tsn",
+                    "name": "forward-tsn"
+                }
+            },
+            "op": "==",
+            "right": 31337
+        }
+    }
+]
+
+# sctp chunk asconf seqno 12345
+[
+    {
+        "match": {
+            "left": {
+                "sctp chunk": {
+                    "field": "seqno",
+                    "name": "asconf"
+                }
+            },
+            "op": "==",
+            "right": 12345
+        }
+    }
+]
+