Commit 1d1a3bcf authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov

libbpf: Poison kernel-only integer types

It's been a recurring issue with types like u32 slipping into libbpf source
code accidentally. This is not detected during builds inside kernel source
tree, but becomes a compilation error in libbpf's Github repo. Libbpf is
supposed to use only __{s,u}{8,16,32,64} typedefs, so poison {s,u}{8,16,32,64}
explicitly in every .c file. Doing that in a bit more centralized way, e.g.,
inside libbpf_internal.h breaks selftests, which are both using kernel u32 and
libbpf_internal.h.

This patch also fixes a new u32 occurence in libbpf.c, added recently.

Fixes: 590a0088 ("bpf: libbpf: Add STRUCT_OPS support")
Signed-off-by: default avatarAndrii Nakryiko <andriin@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200110181916.271446-1-andriin@fb.com
parent 7a2d070f
......@@ -32,6 +32,9 @@
#include "libbpf.h"
#include "libbpf_internal.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
/*
* When building perf, unistd.h is overridden. __NR_bpf is
* required to be defined explicitly.
......
......@@ -8,6 +8,9 @@
#include "libbpf.h"
#include "libbpf_internal.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
struct bpf_prog_linfo {
void *raw_linfo;
void *raw_jited_linfo;
......
......@@ -17,6 +17,9 @@
#include "libbpf_internal.h"
#include "hashmap.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
#define BTF_MAX_NR_TYPES 0x7fffffff
#define BTF_MAX_STR_OFFSET 0x7fffffff
......
......@@ -18,6 +18,9 @@
#include "libbpf.h"
#include "libbpf_internal.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
static const char PREFIXES[] = "\t\t\t\t\t\t\t\t\t\t\t\t\t";
static const size_t PREFIX_CNT = sizeof(PREFIXES) - 1;
......
......@@ -12,6 +12,9 @@
#include <linux/err.h>
#include "hashmap.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
/* start with 4 buckets */
#define HASHMAP_MIN_CAP_BITS 2
......
......@@ -55,6 +55,9 @@
#include "libbpf_internal.h"
#include "hashmap.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
#ifndef EM_BPF
#define EM_BPF 247
#endif
......@@ -6475,7 +6478,7 @@ static int bpf_object__collect_struct_ops_map_reloc(struct bpf_object *obj,
Elf_Data *symbols;
unsigned int moff;
const char *name;
u32 member_idx;
__u32 member_idx;
GElf_Sym sym;
GElf_Rel rel;
int i, nrels;
......
......@@ -13,6 +13,9 @@
#include "libbpf.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
#define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
#define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
#define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
......
......@@ -17,6 +17,9 @@
#include "libbpf.h"
#include "libbpf_internal.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
static bool grep(const char *buffer, const char *pattern)
{
return !!strstr(buffer, pattern);
......
......@@ -15,6 +15,9 @@
#include "libbpf_internal.h"
#include "nlattr.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
#ifndef SOL_NETLINK
#define SOL_NETLINK 270
#endif
......
......@@ -13,6 +13,9 @@
#include <string.h>
#include <stdio.h>
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
static uint16_t nla_attr_minlen[LIBBPF_NLA_TYPE_MAX+1] = {
[LIBBPF_NLA_U8] = sizeof(uint8_t),
[LIBBPF_NLA_U16] = sizeof(uint16_t),
......
......@@ -4,6 +4,9 @@
#include <stdio.h>
#include "str_error.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
/*
* Wrapper to allow for building in non-GNU systems such as Alpine Linux's musl
* libc, while checking strerror_r() return to avoid having to check this in
......
......@@ -32,6 +32,9 @@
#include "libbpf_internal.h"
#include "xsk.h"
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
#ifndef SOL_XDP
#define SOL_XDP 283
#endif
......
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