NetBpfLoad: combine into one file, part one

This eliminates loader.{h,cpp} which exist only for historical
reasons (this stuff used to be the libbpf_android library,
but the split between what was in and outside the lib never
really made all that much sense, and now it is not even a lib...).

Generated via:
  cd //packages/modules/Connectivity/netbpfload
  cat loader.h loader.cpp NetBpfLoad.cpp > z
  cat z > NetBpfLoad.cpp
  rm z loader.cpp loader.h
  git add NetBpfLoad.cpp
  git rm loader.cpp loader.h

Test: does not build, see follow up
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ie1a41a9ce935a7db6be5af810ce92a2d3e290264

netbpfload/loader.h

@@ -1,94 +0,0 @@
-/*
- * Copyright (C) 2018-2023 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-
-#include <linux/bpf.h>
-
-#include <fstream>
-
-namespace android {
-namespace bpf {
-
-// Bpf programs may specify per-program & per-map selinux_context and pin_subdir.
-//
-// The BpfLoader needs to convert these bpf.o specified strings into an enum
-// for internal use (to check that valid values were specified for the specific
-// location of the bpf.o file).
-//
-// It also needs to map selinux_context's into pin_subdir's.
-// This is because of how selinux_context is actually implemented via pin+rename.
-//
-// Thus 'domain' enumerates all selinux_context's/pin_subdir's that the BpfLoader
-// is aware of.  Thus there currently needs to be a 1:1 mapping between the two.
-//
-enum class domain : int {
-    unrecognized = -1,  // invalid for this version of the bpfloader
-    unspecified = 0,    // means just use the default for that specific pin location
-    tethering,          // (S+) fs_bpf_tethering     /sys/fs/bpf/tethering
-    net_private,        // (T+) fs_bpf_net_private   /sys/fs/bpf/net_private
-    net_shared,         // (T+) fs_bpf_net_shared    /sys/fs/bpf/net_shared
-    netd_readonly,      // (T+) fs_bpf_netd_readonly /sys/fs/bpf/netd_readonly
-    netd_shared,        // (T+) fs_bpf_netd_shared   /sys/fs/bpf/netd_shared
-};
-
-// Note: this does not include domain::unrecognized, but does include domain::unspecified
-static constexpr domain AllDomains[] = {
-    domain::unspecified,
-    domain::tethering,
-    domain::net_private,
-    domain::net_shared,
-    domain::netd_readonly,
-    domain::netd_shared,
-};
-
-static constexpr bool unrecognized(domain d) {
-    return d == domain::unrecognized;
-}
-
-// Note: this doesn't handle unrecognized, handle it first.
-static constexpr bool specified(domain d) {
-    return d != domain::unspecified;
-}
-
-struct Location {
-    const char* const dir = "";
-    const char* const prefix = "";
-};
-
-// BPF loader implementation. Loads an eBPF ELF object
-int loadProg(const char* elfPath, bool* isCritical, const unsigned int bpfloader_ver,
-             const Location &location = {});
-
-// Exposed for testing
-unsigned int readSectionUint(const char* name, std::ifstream& elfFile, unsigned int defVal);
-
-// Returns the build type string (from ro.build.type).
-const std::string& getBuildType();
-
-// The following functions classify the 3 Android build types.
-inline bool isEng() {
-    return getBuildType() == "eng";
-}
-inline bool isUser() {
-    return getBuildType() == "user";
-}
-inline bool isUserdebug() {
-    return getBuildType() == "userdebug";
-}
-
-}  // namespace bpf
-}  // namespace android