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 #include <stdio.h> 11 #include <string.h> 12 13 #include "libbpf.h" 14 15 #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START) 16 #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c) 17 #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START) 18 19 static const char *libbpf_strerror_table[NR_ERRNO] = { 20 [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf", 21 [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid", 22 [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost", 23 [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch", 24 [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf", 25 [ERRCODE_OFFSET(RELOC)] = "Relocation failed", 26 [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading", 27 [ERRCODE_OFFSET(PROG2BIG)] = "Program too big", 28 [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version", 29 [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type", 30 [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message", 31 [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence", 32 [ERRCODE_OFFSET(NLPARSE)] = "Incorrect netlink message parsing", 33 }; 34 35 int libbpf_strerror(int err, char *buf, size_t size) 36 { 37 if (!buf || !size) 38 return -1; 39 40 err = err > 0 ? err : -err; 41 42 if (err < __LIBBPF_ERRNO__START) { 43 int ret; 44 45 ret = strerror_r(err, buf, size); 46 buf[size - 1] = '\0'; 47 return ret; 48 } 49 50 if (err < __LIBBPF_ERRNO__END) { 51 const char *msg; 52 53 msg = libbpf_strerror_table[ERRNO_OFFSET(err)]; 54 snprintf(buf, size, "%s", msg); 55 buf[size - 1] = '\0'; 56 return 0; 57 } 58 59 snprintf(buf, size, "Unknown libbpf error %d", err); 60 buf[size - 1] = '\0'; 61 return -1; 62 } 63