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>

3 files changed, 670 insertions, 0 deletions

diff --git a/tests/py/inet/sctp.t b/tests/py/inet/sctp.t
index 5188b57e..3d1c2fd6 100644
--- a/tests/py/inet/sctp.t
+++ b/tests/py/inet/sctp.t
@@ -41,3 +41,40 @@ sctp vtag {33, 55, 67, 88};ok
 sctp vtag != {33, 55, 67, 88};ok
 sctp vtag { 33-55};ok
 sctp vtag != { 33-55};ok
+
+# assert all chunk types are recognized
+sctp chunk data exists;ok
+sctp chunk init exists;ok
+sctp chunk init-ack exists;ok
+sctp chunk sack exists;ok
+sctp chunk heartbeat exists;ok
+sctp chunk heartbeat-ack exists;ok
+sctp chunk abort exists;ok
+sctp chunk shutdown exists;ok
+sctp chunk shutdown-ack exists;ok
+sctp chunk error exists;ok
+sctp chunk cookie-echo exists;ok
+sctp chunk cookie-ack exists;ok
+sctp chunk ecne exists;ok
+sctp chunk cwr exists;ok
+sctp chunk shutdown-complete exists;ok
+sctp chunk asconf-ack exists;ok
+sctp chunk forward-tsn exists;ok
+sctp chunk asconf exists;ok
+
+# test common header fields in random chunk types
+sctp chunk data type 0;ok
+sctp chunk init flags 23;ok
+sctp chunk init-ack length 42;ok
+
+# test one custom field in every applicable chunk type
+sctp chunk data stream 1337;ok
+sctp chunk init initial-tsn 5;ok
+sctp chunk init-ack num-outbound-streams 3;ok
+sctp chunk sack a-rwnd 1;ok
+sctp chunk shutdown cum-tsn-ack 65535;ok
+sctp chunk ecne lowest-tsn 5;ok
+sctp chunk cwr lowest-tsn 8;ok
+sctp chunk asconf-ack seqno 12345;ok
+sctp chunk forward-tsn new-cum-tsn 31337;ok
+sctp chunk asconf seqno 12345;ok
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
+        }
+    }
+]
+
diff --git a/tests/py/inet/sctp.t.payload b/tests/py/inet/sctp.t.payload
index ecfcc725..9c4854cf 100644
--- a/tests/py/inet/sctp.t.payload
+++ b/tests/py/inet/sctp.t.payload
@@ -274,3 +274,158 @@ inet test-inet input
   [ payload load 4b @ transport header + 4 => reg 1 ]
   [ lookup reg 1 set __set%d 0x1 ]
 
+# sctp chunk data exists
+ip
+  [ exthdr load 1b @ 0 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk init exists
+ip
+  [ exthdr load 1b @ 1 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk init-ack exists
+ip
+  [ exthdr load 1b @ 2 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk sack exists
+ip
+  [ exthdr load 1b @ 3 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk heartbeat exists
+ip
+  [ exthdr load 1b @ 4 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk heartbeat-ack exists
+ip
+  [ exthdr load 1b @ 5 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk abort exists
+ip
+  [ exthdr load 1b @ 6 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk shutdown exists
+ip
+  [ exthdr load 1b @ 7 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk shutdown-ack exists
+ip
+  [ exthdr load 1b @ 8 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk error exists
+ip
+  [ exthdr load 1b @ 9 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk cookie-echo exists
+ip
+  [ exthdr load 1b @ 10 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk cookie-ack exists
+ip
+  [ exthdr load 1b @ 11 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk ecne exists
+ip
+  [ exthdr load 1b @ 12 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk cwr exists
+ip
+  [ exthdr load 1b @ 13 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk shutdown-complete exists
+ip
+  [ exthdr load 1b @ 14 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk asconf-ack exists
+ip
+  [ exthdr load 1b @ 128 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk forward-tsn exists
+ip
+  [ exthdr load 1b @ 192 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk asconf exists
+ip
+  [ exthdr load 1b @ 193 + 0 present => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+
+# sctp chunk data type 0
+ip
+  [ exthdr load 1b @ 0 + 0 => reg 1 ]
+  [ cmp eq reg 1 0x00000000 ]
+
+# sctp chunk init flags 23
+ip
+  [ exthdr load 1b @ 1 + 1 => reg 1 ]
+  [ cmp eq reg 1 0x00000017 ]
+
+# sctp chunk init-ack length 42
+ip
+  [ exthdr load 2b @ 2 + 2 => reg 1 ]
+  [ cmp eq reg 1 0x00002a00 ]
+
+# sctp chunk data stream 1337
+ip
+  [ exthdr load 2b @ 0 + 8 => reg 1 ]
+  [ cmp eq reg 1 0x00003905 ]
+
+# sctp chunk init initial-tsn 5
+ip
+  [ exthdr load 4b @ 1 + 16 => reg 1 ]
+  [ cmp eq reg 1 0x05000000 ]
+
+# sctp chunk init-ack num-outbound-streams 3
+ip
+  [ exthdr load 2b @ 2 + 12 => reg 1 ]
+  [ cmp eq reg 1 0x00000300 ]
+
+# sctp chunk sack a-rwnd 1
+ip
+  [ exthdr load 4b @ 3 + 8 => reg 1 ]
+  [ cmp eq reg 1 0x01000000 ]
+
+# sctp chunk shutdown cum-tsn-ack 65535
+ip
+  [ exthdr load 4b @ 7 + 4 => reg 1 ]
+  [ cmp eq reg 1 0xffff0000 ]
+
+# sctp chunk ecne lowest-tsn 5
+ip
+  [ exthdr load 4b @ 12 + 4 => reg 1 ]
+  [ cmp eq reg 1 0x05000000 ]
+
+# sctp chunk cwr lowest-tsn 8
+ip
+  [ exthdr load 4b @ 13 + 4 => reg 1 ]
+  [ cmp eq reg 1 0x08000000 ]
+
+# sctp chunk asconf-ack seqno 12345
+ip
+  [ exthdr load 4b @ 128 + 4 => reg 1 ]
+  [ cmp eq reg 1 0x39300000 ]
+
+# sctp chunk forward-tsn new-cum-tsn 31337
+ip
+  [ exthdr load 4b @ 192 + 4 => reg 1 ]
+  [ cmp eq reg 1 0x697a0000 ]
+
+# sctp chunk asconf seqno 12345
+ip
+  [ exthdr load 4b @ 193 + 4 => reg 1 ]
+  [ cmp eq reg 1 0x39300000 ]
+