1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) 2 3 /* 4 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org> 5 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com> 6 * Copyright (C) 2015 Huawei Inc. 7 * Copyright (C) 2017 Nicira, Inc. 8 */ 9 10 #undef _GNU_SOURCE 11 #include <stdio.h> 12 #include <string.h> 13 14 #include "libbpf.h" 15 16 /* make sure libbpf doesn't use kernel-only integer typedefs */ 17 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64 18 19 #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START) 20 #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c) 21 #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START) 22 23 static const char *libbpf_strerror_table[NR_ERRNO] = { 24 [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf", 25 [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid", 26 [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost", 27 [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch", 28 [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf", 29 [ERRCODE_OFFSET(RELOC)] = "Relocation failed", 30 [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading", 31 [ERRCODE_OFFSET(PROG2BIG)] = "Program too big", 32 [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version", 33 [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type", 34 [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message", 35 [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence", 36 [ERRCODE_OFFSET(NLPARSE)] = "Incorrect netlink message parsing", 37 }; 38 39 int libbpf_strerror(int err, char *buf, size_t size) 40 { 41 if (!buf || !size) 42 return -1; 43 44 err = err > 0 ? err : -err; 45 46 if (err < __LIBBPF_ERRNO__START) { 47 int ret; 48 49 ret = strerror_r(err, buf, size); 50 buf[size - 1] = '\0'; 51 return ret; 52 } 53 54 if (err < __LIBBPF_ERRNO__END) { 55 const char *msg; 56 57 msg = libbpf_strerror_table[ERRNO_OFFSET(err)]; 58 snprintf(buf, size, "%s", msg); 59 buf[size - 1] = '\0'; 60 return 0; 61 } 62 63 snprintf(buf, size, "Unknown libbpf error %d", err); 64 buf[size - 1] = '\0'; 65 return -1; 66 } 67