commit 2af8823f2cc778efa0cd8d9b2f7ec761a72e5feb
Author: Pim Kunis <pim@kunis.nl>
Date:   Tue Dec 24 16:46:35 2024 +0100

    Add dropworld

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b2be92b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+result
diff --git a/dropworld/default.nix b/dropworld/default.nix
new file mode 100644
index 0000000..f102fcc
--- /dev/null
+++ b/dropworld/default.nix
@@ -0,0 +1,16 @@
+{clangStdenv, libbpf, ...}: clangStdenv.mkDerivation {
+  name = "dropworld";
+  src = ./.;
+  hardeningDisable = [ "stackprotector" "zerocallusedregs" ];
+  dontFixup = true;
+  buildInputs = [ libbpf ];
+
+  buildPhase = ''
+    clang -O2 -target bpf -g -c dropworld.c -o dropworld.o
+  '';
+
+  installPhase = ''
+    mkdir $out
+    cp dropworld.o $out
+  '';
+}
diff --git a/dropworld/dropworld.c b/dropworld/dropworld.c
new file mode 100644
index 0000000..1b98ec7
--- /dev/null
+++ b/dropworld/dropworld.c
@@ -0,0 +1,9 @@
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+SEC("xdp")
+int xdp_drop(struct xdp_md *ctx) {
+    return XDP_DROP; // Drop all packets
+}
+
+char LICENSE[] SEC("license") = "GPL";
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..396ec32
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1734649271,
+        "narHash": "sha256-4EVBRhOjMDuGtMaofAIqzJbg4Ql7Ai0PSeuVZTHjyKQ=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "d70bd19e0a38ad4790d3913bf08fcbfc9eeca507",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..80680df
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,17 @@
+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = inputs: inputs.flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = inputs.nixpkgs.legacyPackages.${system};
+    in
+    {
+      packages.dropworld = pkgs.callPackage ./dropworld {};
+    }
+  );
+}