DONT PUSH

samples/bpf/Makefile

@@ -221,6 +221,7 @@ BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
 			  readelf -S ./llvm_btf_verify.o | grep BTF; \
 			  /bin/rm -f ./llvm_btf_verify.o)
 
+EXTRA_CFLAGS += -fno-stack-protector
 ifneq ($(BTF_LLVM_PROBE),)
 	EXTRA_CFLAGS += -g
 else

samples/bpf/xdplua_kern.c

@@ -1,13 +1,31 @@
 #define KBUILD_MODNAME "foo"
 #include <uapi/linux/bpf.h>
 #include "bpf_helpers.h"
+#include <linux/if_ether.h>
 
 SEC("xdp1")
 int xdp_prog1(struct xdp_md *ctx)
 {
-	char funcname[] = "callback";
+	void *data_end = (void *)(long)ctx->data_end;
+	void *data = (void *)(long)ctx->data;
+	struct ethhdr *eth = data;
+	//int rc = XDP_PASS;
+	u16 h_proto;
+	u64 nh_off;
+	int i = 0;
+	int bla = 0;
+	char a[] = "oi %d\n";
 
-	return bpf_lua_run(ctx, funcname);
+	nh_off = sizeof(*eth);
+	if (data + nh_off > data_end)
+		return XDP_PASS;
+
+	h_proto = eth->h_proto;
+	for (int j = 0; j < h_proto; j++) {
+		bla++;
+	}
+
+	return bla;
 }
 
 char _license[] SEC("license") = "GPL";