style: format bpf c code using kernel checkpatch.pl (#477)

.github/workflows/lint.yml

@@ -0,0 +1,23 @@
+name: Lint
+
+on:
+  pull_request:
+    paths:
+      - "**/*.c"
+      - "**/*.h"
+      - ".github/workflows/lint.yml"
+
+jobs:
+
+  test:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Perl
+      uses: shogo82148/actions-setup-perl@v1
+      with:
+        perl-version: "5.38"
+
+    - name: Run lint
+      run: make ebpf-lint

Makefile

@@ -96,4 +96,7 @@ ebpf: submodule clean-ebpf
     go generate ./control/control.go && \
     go generate ./trace/trace.go && echo trace > $(BUILD_TAGS_FILE) || echo > $(BUILD_TAGS_FILE)
 
+ebpf-lint:
+	./scripts/checkpatch.pl --no-tree --strict --no-summary --show-types --color=always control/kern/tproxy.c --ignore COMMIT_COMMENT_SYMBOL,NOT_UNIFIED_DIFF,COMMIT_LOG_LONG_LINE,LONG_LINE_COMMENT,VOLATILE,ASSIGN_IN_IF,PREFER_DEFINED_ATTRIBUTE_MACRO,CAMELCASE,LEADING_SPACE
+
 ## End Ebpf