docs: Document the hooks that Cilium uses

Technically we also have the following, but their use is deprecated so I have omitted them from this commit: - ``BPF_PROG_TYPE_SOCK_OPS`` - ``BPF_PROG_TYPE_SK_MSG`` Signed-off-by: Joe Stringer <joe@cilium.io>
cilium · Feb 15, 2023 · 192dea5 · 192dea5
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diff --git a/Documentation/internals/hooks.rst b/Documentation/internals/hooks.rst
@@ -0,0 +1,14 @@
+.. only:: not (epub or latex or html)
+
+    WARNING: You are looking at unreleased Cilium documentation.
+    Please use the official rendered version released here:
+    https://docs.cilium.io
+
+eBPF Program Types
+==================
+
+Cilium uses the following eBPF program types to attach programs to the kernel:
+
+- ``BPF_PROG_TYPE_XDP``
+- ``BPF_PROG_TYPE_SCHED_ACT``
+- ``BPF_PROG_TYPE_CGROUP_SOCK_ADDR``
diff --git a/Documentation/internals/index.rst b/Documentation/internals/index.rst
@@ -15,4 +15,5 @@ Internals
    ../contributing/development/codeoverview
    hubble
    cilium_operator
+   hooks
    security-identities