From 96a22e33dd26b01a6711412508d28d8cabd66e87 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Wed, 3 Apr 2024 12:28:12 +0200
Subject: tests: packetpath: add check for drop policy

check that policy can be changed from accept to drop and that the kernel
acts on this.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 .../testcases/packetpath/dumps/policy.json-nft     | 121 +++++++++++++++++++++
 tests/shell/testcases/packetpath/dumps/policy.nft  |  11 ++
 tests/shell/testcases/packetpath/policy            |  42 +++++++
 3 files changed, 174 insertions(+)
 create mode 100644 tests/shell/testcases/packetpath/dumps/policy.json-nft
 create mode 100644 tests/shell/testcases/packetpath/dumps/policy.nft
 create mode 100755 tests/shell/testcases/packetpath/policy

diff --git a/tests/shell/testcases/packetpath/dumps/policy.json-nft b/tests/shell/testcases/packetpath/dumps/policy.json-nft
new file mode 100644
index 00000000..26e8a052
--- /dev/null
+++ b/tests/shell/testcases/packetpath/dumps/policy.json-nft
@@ -0,0 +1,121 @@
+{
+  "nftables": [
+    {
+      "metainfo": {
+        "version": "VERSION",
+        "release_name": "RELEASE_NAME",
+        "json_schema_version": 1
+      }
+    },
+    {
+      "table": {
+        "family": "inet",
+        "name": "filter",
+        "handle": 0
+      }
+    },
+    {
+      "chain": {
+        "family": "inet",
+        "table": "filter",
+        "name": "underflow",
+        "handle": 0
+      }
+    },
+    {
+      "chain": {
+        "family": "inet",
+        "table": "filter",
+        "name": "input",
+        "handle": 0,
+        "type": "filter",
+        "hook": "input",
+        "prio": 0,
+        "policy": "drop"
+      }
+    },
+    {
+      "rule": {
+        "family": "inet",
+        "table": "filter",
+        "chain": "input",
+        "handle": 0,
+        "expr": [
+          {
+            "match": {
+              "op": "==",
+              "left": {
+                "payload": {
+                  "protocol": "icmp",
+                  "field": "type"
+                }
+              },
+              "right": "echo-reply"
+            }
+          },
+          {
+            "accept": null
+          }
+        ]
+      }
+    },
+    {
+      "rule": {
+        "family": "inet",
+        "table": "filter",
+        "chain": "input",
+        "handle": 0,
+        "expr": [
+          {
+            "match": {
+              "op": "==",
+              "left": {
+                "payload": {
+                  "protocol": "ip",
+                  "field": "saddr"
+                }
+              },
+              "right": "127.0.0.1"
+            }
+          },
+          {
+            "match": {
+              "op": "==",
+              "left": {
+                "payload": {
+                  "protocol": "ip",
+                  "field": "daddr"
+                }
+              },
+              "right": "127.0.0.2"
+            }
+          },
+          {
+            "counter": {
+              "packets": 3,
+              "bytes": 252
+            }
+          },
+          {
+            "accept": null
+          }
+        ]
+      }
+    },
+    {
+      "rule": {
+        "family": "inet",
+        "table": "filter",
+        "chain": "input",
+        "handle": 0,
+        "expr": [
+          {
+            "goto": {
+              "target": "underflow"
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
diff --git a/tests/shell/testcases/packetpath/dumps/policy.nft b/tests/shell/testcases/packetpath/dumps/policy.nft
new file mode 100644
index 00000000..e625ea6c
--- /dev/null
+++ b/tests/shell/testcases/packetpath/dumps/policy.nft
@@ -0,0 +1,11 @@
+table inet filter {
+	chain underflow {
+	}
+
+	chain input {
+		type filter hook input priority filter; policy drop;
+		icmp type echo-reply accept
+		ip saddr 127.0.0.1 ip daddr 127.0.0.2 counter packets 3 bytes 252 accept
+		goto underflow
+	}
+}
diff --git a/tests/shell/testcases/packetpath/policy b/tests/shell/testcases/packetpath/policy
new file mode 100755
index 00000000..0bb42a54
--- /dev/null
+++ b/tests/shell/testcases/packetpath/policy
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+ip link set lo up
+
+$NFT -f - <<EOF
+table inet filter {
+ chain underflow { }
+
+  chain input {
+    type filter hook input priority filter; policy accept;
+    icmp type echo-reply accept
+    ip saddr 127.0.0.1 ip daddr 127.0.0.2 counter accept
+    goto underflow
+    }
+}
+EOF
+[ $? -ne 0 ] && exit 1
+
+ping -q -c 1 127.0.0.2 >/dev/null || exit 2
+
+# should work, polict is accept.
+ping -q -c 1 127.0.0.1 >/dev/null || exit 1
+
+$NFT -f - <<EOF
+table inet filter {
+  chain input {
+    type filter hook input priority filter; policy drop;
+  }
+}
+EOF
+[ $? -ne 0 ] && exit 1
+
+$NFT list ruleset
+
+ping -W 1 -q -c 1 127.0.0.2
+
+ping -q -c 1 127.0.0.2 >/dev/null || exit 2
+
+# should fail, policy is set to drop
+ping -W 1 -q -c 1 127.0.0.1 >/dev/null 2>&1 && exit 1
+
+exit 0
-- 
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