[NETD-BPF#22] Move a few headers to frameworks/libs/net
BPF headers used by both platform and mainline modules should be in
frameworks/libs/net.
Bug: 202086915
Test: build and boot
Test: cd packages/modules/Connectivity/netd; atest
Change-Id: Id9ac888d5519b2a8663232610d36386cabfe4e94
diff --git a/libbpf_android/Loader.cpp b/libbpf_android/Loader.cpp
index 1892fe2..abe1704 100644
--- a/libbpf_android/Loader.cpp
+++ b/libbpf_android/Loader.cpp
@@ -33,8 +33,8 @@
#define BPFLOADER_VERSION_MINOR 8u
#define BPFLOADER_VERSION ((BPFLOADER_VERSION_MAJOR << 16) | BPFLOADER_VERSION_MINOR)
-#include "../progs/include/bpf_map_def.h"
#include "bpf/BpfUtils.h"
+#include "bpf/bpf_map_def.h"
#include "include/libbpf_android.h"
#include <cstdlib>
diff --git a/progs/include/bpf_helpers.h b/progs/include/bpf_helpers.h
deleted file mode 100644
index 878bb10..0000000
--- a/progs/include/bpf_helpers.h
+++ /dev/null
@@ -1,216 +0,0 @@
-/* Common BPF helpers to be used by all BPF programs loaded by Android */
-
-#include <linux/bpf.h>
-#include <stdbool.h>
-#include <stdint.h>
-
-#include "bpf_map_def.h"
-
-/******************************************************************************
- * WARNING: CHANGES TO THIS FILE OUTSIDE OF AOSP/MASTER ARE LIKELY TO BREAK *
- * DEVICE COMPATIBILITY WITH MAINLINE MODULES SHIPPING EBPF CODE. *
- * *
- * THIS WILL LIKELY RESULT IN BRICKED DEVICES AT SOME ARBITRARY FUTURE TIME *
- * *
- * THAT GOES ESPECIALLY FOR THE 'SECTION' 'LICENSE' AND 'CRITICAL' MACROS *
- * *
- * We strongly suggest that if you need changes to bpfloader functionality *
- * you get your changes reviewed and accepted into aosp/master. *
- * *
- ******************************************************************************/
-
-/* For mainline module use, you can #define BPFLOADER_{MIN/MAX}_VER
- * before #include "bpf_helpers.h" to change which bpfloaders will
- * process the resulting .o file.
- *
- * While this will work outside of mainline too, there just is no point to
- * using it when the .o and the bpfloader ship in sync with each other.
- */
-#ifndef BPFLOADER_MIN_VER
-#define BPFLOADER_MIN_VER DEFAULT_BPFLOADER_MIN_VER
-#endif
-
-#ifndef BPFLOADER_MAX_VER
-#define BPFLOADER_MAX_VER DEFAULT_BPFLOADER_MAX_VER
-#endif
-
-/* place things in different elf sections */
-#define SECTION(NAME) __attribute__((section(NAME), used))
-
-/* Must be present in every program, example usage:
- * LICENSE("GPL"); or LICENSE("Apache 2.0");
- *
- * We also take this opportunity to embed a bunch of other useful values in
- * the resulting .o (This is to enable some limited forward compatibility
- * with mainline module shipped ebpf programs)
- *
- * The bpfloader_{min/max}_ver defines the [min, max) range of bpfloader
- * versions that should load this .o file (bpfloaders outside of this range
- * will simply ignore/skip this *entire* .o)
- * The [inclusive,exclusive) matches what we do for kernel ver dependencies.
- *
- * The size_of_bpf_{map,prog}_def allow the bpfloader to load programs where
- * these structures have been extended with additional fields (they will of
- * course simply be ignored then).
- *
- * If missing, bpfloader_{min/max}_ver default to 0/0x10000 ie. [v0.0, v1.0),
- * while size_of_bpf_{map/prog}_def default to 32/20 which are the v0.0 sizes.
- */
-#define LICENSE(NAME) \
- unsigned int _bpfloader_min_ver SECTION("bpfloader_min_ver") = BPFLOADER_MIN_VER; \
- unsigned int _bpfloader_max_ver SECTION("bpfloader_max_ver") = BPFLOADER_MAX_VER; \
- size_t _size_of_bpf_map_def SECTION("size_of_bpf_map_def") = sizeof(struct bpf_map_def); \
- size_t _size_of_bpf_prog_def SECTION("size_of_bpf_prog_def") = sizeof(struct bpf_prog_def); \
- char _license[] SECTION("license") = (NAME)
-
-/* flag the resulting bpf .o file as critical to system functionality,
- * loading all kernel version appropriate programs in it must succeed
- * for bpfloader success
- */
-#define CRITICAL(REASON) char _critical[] SECTION("critical") = (REASON)
-
-/*
- * Helper functions called from eBPF programs written in C. These are
- * implemented in the kernel sources.
- */
-
-#define KVER_NONE 0
-#define KVER(a, b, c) (((a) << 24) + ((b) << 16) + (c))
-#define KVER_INF 0xFFFFFFFFu
-
-/* generic functions */
-
-/*
- * Type-unsafe bpf map functions - avoid if possible.
- *
- * Using these it is possible to pass in keys/values of the wrong type/size,
- * or, for 'bpf_map_lookup_elem_unsafe' receive into a pointer to the wrong type.
- * You will not get a compile time failure, and for certain types of errors you
- * might not even get a failure from the kernel's ebpf verifier during program load,
- * instead stuff might just not work right at runtime.
- *
- * Instead please use:
- * DEFINE_BPF_MAP(foo_map, TYPE, KeyType, ValueType, num_entries)
- * where TYPE can be something like HASH or ARRAY, and num_entries is an integer.
- *
- * This defines the map (hence this should not be used in a header file included
- * from multiple locations) and provides type safe accessors:
- * ValueType * bpf_foo_map_lookup_elem(const KeyType *)
- * int bpf_foo_map_update_elem(const KeyType *, const ValueType *, flags)
- * int bpf_foo_map_delete_elem(const KeyType *)
- *
- * This will make sure that if you change the type of a map you'll get compile
- * errors at any spots you forget to update with the new type.
- *
- * Note: these all take pointers to const map because from the C/eBPF point of view
- * the map struct is really just a readonly map definition of the in kernel object.
- * Runtime modification of the map defining struct is meaningless, since
- * the contents is only ever used during bpf program loading & map creation
- * by the bpf loader, and not by the eBPF program itself.
- */
-static void* (*bpf_map_lookup_elem_unsafe)(const struct bpf_map_def* map,
- const void* key) = (void*)BPF_FUNC_map_lookup_elem;
-static int (*bpf_map_update_elem_unsafe)(const struct bpf_map_def* map, const void* key,
- const void* value, unsigned long long flags) = (void*)
- BPF_FUNC_map_update_elem;
-static int (*bpf_map_delete_elem_unsafe)(const struct bpf_map_def* map,
- const void* key) = (void*)BPF_FUNC_map_delete_elem;
-
-/* type safe macro to declare a map and related accessor functions */
-#define DEFINE_BPF_MAP_UGM(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries, usr, grp, md) \
- const struct bpf_map_def SECTION("maps") the_map = { \
- .type = BPF_MAP_TYPE_##TYPE, \
- .key_size = sizeof(TypeOfKey), \
- .value_size = sizeof(TypeOfValue), \
- .max_entries = (num_entries), \
- .map_flags = 0, \
- .uid = (usr), \
- .gid = (grp), \
- .mode = (md), \
- .bpfloader_min_ver = DEFAULT_BPFLOADER_MIN_VER, \
- .bpfloader_max_ver = DEFAULT_BPFLOADER_MAX_VER, \
- .min_kver = KVER_NONE, \
- .max_kver = KVER_INF, \
- }; \
- \
- static inline __always_inline __unused TypeOfValue* bpf_##the_map##_lookup_elem( \
- const TypeOfKey* k) { \
- return bpf_map_lookup_elem_unsafe(&the_map, k); \
- }; \
- \
- static inline __always_inline __unused int bpf_##the_map##_update_elem( \
- const TypeOfKey* k, const TypeOfValue* v, unsigned long long flags) { \
- return bpf_map_update_elem_unsafe(&the_map, k, v, flags); \
- }; \
- \
- static inline __always_inline __unused int bpf_##the_map##_delete_elem(const TypeOfKey* k) { \
- return bpf_map_delete_elem_unsafe(&the_map, k); \
- };
-
-#define DEFINE_BPF_MAP(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries) \
- DEFINE_BPF_MAP_UGM(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries, AID_ROOT, AID_ROOT, 0600)
-
-#define DEFINE_BPF_MAP_GWO(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries, gid) \
- DEFINE_BPF_MAP_UGM(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries, AID_ROOT, gid, 0620)
-
-#define DEFINE_BPF_MAP_GRO(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries, gid) \
- DEFINE_BPF_MAP_UGM(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries, AID_ROOT, gid, 0640)
-
-#define DEFINE_BPF_MAP_GRW(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries, gid) \
- DEFINE_BPF_MAP_UGM(the_map, TYPE, TypeOfKey, TypeOfValue, num_entries, AID_ROOT, gid, 0660)
-
-static int (*bpf_probe_read)(void* dst, int size, void* unsafe_ptr) = (void*) BPF_FUNC_probe_read;
-static int (*bpf_probe_read_str)(void* dst, int size, void* unsafe_ptr) = (void*) BPF_FUNC_probe_read_str;
-static unsigned long long (*bpf_ktime_get_ns)(void) = (void*) BPF_FUNC_ktime_get_ns;
-static unsigned long long (*bpf_ktime_get_boot_ns)(void) = (void*)BPF_FUNC_ktime_get_boot_ns;
-static int (*bpf_trace_printk)(const char* fmt, int fmt_size, ...) = (void*) BPF_FUNC_trace_printk;
-static unsigned long long (*bpf_get_current_pid_tgid)(void) = (void*) BPF_FUNC_get_current_pid_tgid;
-static unsigned long long (*bpf_get_current_uid_gid)(void) = (void*) BPF_FUNC_get_current_uid_gid;
-static unsigned long long (*bpf_get_smp_processor_id)(void) = (void*) BPF_FUNC_get_smp_processor_id;
-
-#define DEFINE_BPF_PROG_KVER_RANGE_OPT(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv, max_kv, \
- opt) \
- const struct bpf_prog_def SECTION("progs") the_prog##_def = { \
- .uid = (prog_uid), \
- .gid = (prog_gid), \
- .min_kver = (min_kv), \
- .max_kver = (max_kv), \
- .optional = (opt), \
- .bpfloader_min_ver = DEFAULT_BPFLOADER_MIN_VER, \
- .bpfloader_max_ver = DEFAULT_BPFLOADER_MAX_VER, \
- }; \
- SECTION(SECTION_NAME) \
- int the_prog
-
-// Programs (here used in the sense of functions/sections) marked optional are allowed to fail
-// to load (for example due to missing kernel patches).
-// The bpfloader will just ignore these failures and continue processing the next section.
-//
-// A non-optional program (function/section) failing to load causes a failure and aborts
-// processing of the entire .o, if the .o is additionally marked critical, this will result
-// in the entire bpfloader process terminating with a failure and not setting the bpf.progs_loaded
-// system property. This in turn results in waitForProgsLoaded() never finishing.
-//
-// ie. a non-optional program in a critical .o is mandatory for kernels matching the min/max kver.
-
-// programs requiring a kernel version >= min_kv && < max_kv
-#define DEFINE_BPF_PROG_KVER_RANGE(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv, max_kv) \
- DEFINE_BPF_PROG_KVER_RANGE_OPT(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv, max_kv, \
- false)
-#define DEFINE_OPTIONAL_BPF_PROG_KVER_RANGE(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv, \
- max_kv) \
- DEFINE_BPF_PROG_KVER_RANGE_OPT(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv, max_kv, true)
-
-// programs requiring a kernel version >= min_kv
-#define DEFINE_BPF_PROG_KVER(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv) \
- DEFINE_BPF_PROG_KVER_RANGE_OPT(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv, KVER_INF, \
- false)
-#define DEFINE_OPTIONAL_BPF_PROG_KVER(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv) \
- DEFINE_BPF_PROG_KVER_RANGE_OPT(SECTION_NAME, prog_uid, prog_gid, the_prog, min_kv, KVER_INF, \
- true)
-
-// programs with no kernel version requirements
-#define DEFINE_BPF_PROG(SECTION_NAME, prog_uid, prog_gid, the_prog) \
- DEFINE_BPF_PROG_KVER_RANGE_OPT(SECTION_NAME, prog_uid, prog_gid, the_prog, 0, KVER_INF, false)
-#define DEFINE_OPTIONAL_BPF_PROG(SECTION_NAME, prog_uid, prog_gid, the_prog) \
- DEFINE_BPF_PROG_KVER_RANGE_OPT(SECTION_NAME, prog_uid, prog_gid, the_prog, 0, KVER_INF, true)
diff --git a/progs/include/bpf_map_def.h b/progs/include/bpf_map_def.h
deleted file mode 100644
index 02b2096..0000000
--- a/progs/include/bpf_map_def.h
+++ /dev/null
@@ -1,177 +0,0 @@
-/*
- * Copyright (C) 2020 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
-
-/* This file is separate because it's included both by eBPF programs (via include
- * in bpf_helpers.h) and directly by the boot time bpfloader (Loader.cpp).
- */
-
-#include <linux/bpf.h>
-
-// Pull in AID_* constants from //system/core/libcutils/include/private/android_filesystem_config.h
-#include <private/android_filesystem_config.h>
-
-/******************************************************************************
- * *
- * ! ! ! W A R N I N G ! ! ! *
- * *
- * CHANGES TO THESE STRUCTURE DEFINITIONS OUTSIDE OF AOSP/MASTER *WILL* BREAK *
- * MAINLINE MODULE COMPATIBILITY *
- * *
- * AND THUS MAY RESULT IN YOUR DEVICE BRICKING AT SOME ARBITRARY POINT IN *
- * THE FUTURE *
- * *
- * (and even in aosp/master you may only append new fields at the very end, *
- * you may *never* delete fields, change their types, ordering, insert in *
- * the middle, etc. If a mainline module using the old definition has *
- * already shipped (which happens roughly monthly), then it's set in stone) *
- * *
- ******************************************************************************/
-
-// These are the values used if these fields are missing
-#define DEFAULT_BPFLOADER_MIN_VER 0u // v0.0 (this is inclusive ie. >= v0.0)
-#define DEFAULT_BPFLOADER_MAX_VER 0x10000u // v1.0 (this is exclusive ie. < v1.0)
-#define DEFAULT_SIZEOF_BPF_MAP_DEF 32 // v0.0 struct: enum (uint sized) + 7 uint
-#define DEFAULT_SIZEOF_BPF_PROG_DEF 20 // v0.0 struct: 4 uint + bool + 3 byte alignment pad
-
-/*
- * The bpf_{map,prog}_def structures are compiled for different architectures.
- * Once by the BPF compiler for the BPF architecture, and once by a C++
- * compiler for the native Android architecture for the bpfloader.
- *
- * For things to work, their layout must be the same between the two.
- * The BPF architecture is platform independent ('64-bit LSB bpf').
- * So this effectively means these structures must be the same layout
- * on 5 architectures, all of them little endian:
- * 64-bit BPF, x86_64, arm and 32-bit x86 and arm
- *
- * As such for any types we use inside of these structs we must make sure that
- * the size and alignment are the same, so the same amount of padding is used.
- *
- * Currently we only use: bool, enum bpf_map_type and unsigned int.
- * Additionally we use char for padding.
- *
- * !!! WARNING: HERE BE DRAGONS !!!
- *
- * Be particularly careful with 64-bit integers.
- * You will need to manually override their alignment to 8 bytes.
- *
- * To quote some parts of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69560
- *
- * Some types have weaker alignment requirements when they are structure members.
- *
- * unsigned long long on x86 is such a type.
- *
- * C distinguishes C11 _Alignof (the minimum alignment the type is guaranteed
- * to have in all contexts, so 4, see min_align_of_type) from GNU C __alignof
- * (the normal alignment of the type, so 8).
- *
- * alignof / _Alignof == minimum alignment required by target ABI
- * __alignof / __alignof__ == preferred alignment
- *
- * When in a struct, apparently the minimum alignment is used.
- */
-
-_Static_assert(sizeof(bool) == 1, "sizeof bool != 1");
-_Static_assert(__alignof__(bool) == 1, "__alignof__ bool != 1");
-_Static_assert(_Alignof(bool) == 1, "_Alignof bool != 1");
-
-_Static_assert(sizeof(char) == 1, "sizeof char != 1");
-_Static_assert(__alignof__(char) == 1, "__alignof__ char != 1");
-_Static_assert(_Alignof(char) == 1, "_Alignof char != 1");
-
-// This basically verifies that an enum is 'just' a 32-bit int
-_Static_assert(sizeof(enum bpf_map_type) == 4, "sizeof enum bpf_map_type != 4");
-_Static_assert(__alignof__(enum bpf_map_type) == 4, "__alignof__ enum bpf_map_type != 4");
-_Static_assert(_Alignof(enum bpf_map_type) == 4, "_Alignof enum bpf_map_type != 4");
-
-// Linux kernel requires sizeof(int) == 4, sizeof(void*) == sizeof(long), sizeof(long long) == 8
-_Static_assert(sizeof(unsigned int) == 4, "sizeof unsigned int != 4");
-_Static_assert(__alignof__(unsigned int) == 4, "__alignof__ unsigned int != 4");
-_Static_assert(_Alignof(unsigned int) == 4, "_Alignof unsigned int != 4");
-
-// We don't currently use any 64-bit types in these structs, so this is purely to document issue.
-// Here sizeof & __alignof__ are consistent, but _Alignof is not: compile for 'aosp_cf_x86_phone'
-_Static_assert(sizeof(unsigned long long) == 8, "sizeof unsigned long long != 8");
-_Static_assert(__alignof__(unsigned long long) == 8, "__alignof__ unsigned long long != 8");
-// BPF wants 8, but 32-bit x86 wants 4
-//_Static_assert(_Alignof(unsigned long long) == 8, "_Alignof unsigned long long != 8");
-
-/*
- * Map structure to be used by Android eBPF C programs. The Android eBPF loader
- * uses this structure from eBPF object to create maps at boot time.
- *
- * The eBPF C program should define structure in the maps section using
- * SECTION("maps") otherwise it will be ignored by the eBPF loader.
- *
- * For example:
- * const struct bpf_map_def SECTION("maps") mymap { .type=... , .key_size=... }
- *
- * See 'bpf_helpers.h' for helpful macros for eBPF program use.
- */
-struct bpf_map_def {
- enum bpf_map_type type;
- unsigned int key_size;
- unsigned int value_size;
- unsigned int max_entries;
- unsigned int map_flags;
-
- // The following are not supported by the Android bpfloader:
- // unsigned int inner_map_idx;
- // unsigned int numa_node;
-
- unsigned int uid; // uid_t
- unsigned int gid; // gid_t
- unsigned int mode; // mode_t
-
- // The following fields were added in version 0.1
- unsigned int bpfloader_min_ver; // if missing, defaults to 0, ie. v0.0
- unsigned int bpfloader_max_ver; // if missing, defaults to 0x10000, ie. v1.0
-
- // The following fields were added in version 0.2
- // kernelVersion() must be >= min_kver and < max_kver
- unsigned int min_kver;
- unsigned int max_kver;
-};
-
-// This needs to be updated whenever the above structure definition is expanded.
-_Static_assert(sizeof(struct bpf_map_def) == 48, "sizeof struct bpf_map_def != 48");
-_Static_assert(__alignof__(struct bpf_map_def) == 4, "__alignof__ struct bpf_map_def != 4");
-_Static_assert(_Alignof(struct bpf_map_def) == 4, "_Alignof struct bpf_map_def != 4");
-
-struct bpf_prog_def {
- unsigned int uid;
- unsigned int gid;
-
- // kernelVersion() must be >= min_kver and < max_kver
- unsigned int min_kver;
- unsigned int max_kver;
-
- bool optional; // program section (ie. function) may fail to load, continue onto next func.
- char pad0[3];
-
- // The following fields were added in version 0.1
- unsigned int bpfloader_min_ver; // if missing, defaults to 0, ie. v0.0
- unsigned int bpfloader_max_ver; // if missing, defaults to 0x10000, ie. v1.0
-
- // No new fields in version 0.2
-};
-
-// This needs to be updated whenever the above structure definition is expanded.
-_Static_assert(sizeof(struct bpf_prog_def) == 28, "sizeof struct bpf_prog_def != 28");
-_Static_assert(__alignof__(struct bpf_prog_def) == 4, "__alignof__ struct bpf_prog_def != 4");
-_Static_assert(_Alignof(struct bpf_prog_def) == 4, "_Alignof struct bpf_prog_def != 4");