Make networking a header

Author: Outfluencer

build.rs

@@ -78,7 +78,7 @@ fn main() {
     // 3. Re-run if relevant files change
     println!("cargo:rerun-if-changed=c/minecraft_filter.c");
     println!("cargo:rerun-if-changed=c/common.h");
-    println!("cargo:rerun-if-changed=c/minecraft_networking.c");
+    println!("cargo:rerun-if-changed=c/minecraft_networking.h");
     println!("cargo:rerun-if-changed=c/stats.h");
     println!("cargo:rerun-if-changed=build.rs");
 }

c/minecraft_filter.c

@@ -16,13 +16,11 @@
 #include <linux/tcp.h>
 #include <linux/in.h>
 #include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
 #include "common.h"
-#include "minecraft_networking.c"
+#include "minecraft_networking.h"
 #include "stats.h"
 
-// Minecraft server port
-const __u16 ETH_IP_PROTO = __constant_htons(ETH_P_IP);
-
 struct
 {
     __uint(type,
@@ -153,7 +151,7 @@ __s32 minecraft_filter(struct xdp_md *ctx)
         return XDP_DROP;
     }
 
-    if (eth->h_proto != ETH_IP_PROTO)
+    if (eth->h_proto != bpf_htons(ETH_P_IP))
     {
         return XDP_PASS;
     }

c/minecraft_networking.c c/minecraft_networking.hc/minecraft_networking.c renamed to c/minecraft_networking.h

@@ -1,3 +1,6 @@
+#ifndef MINECRAFT_NETWORKING_H
+#define MINECRAFT_NETWORKING_H
+
 #include <linux/types.h>
 
 #include "minecraft_helper.h"
@@ -153,3 +156,5 @@ static __always_inline __s32 inspect_handshake(__u8 *reader_index, const __u8 *p
     *current_reader_index = reader_index;
     return intention == 1 ? DIRECT_READ_STATUS_REQUEST : DIRECT_READ_LOGIN;
 }
+
+#endif