1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2 1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2 2
3 /* 3 /*
4 * Copyright (C) 2013-2015 Alexei Starovoitov 4 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
5 * Copyright (C) 2015 Wang Nan <wangnan0@huawe 5 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
6 * Copyright (C) 2015 Huawei Inc. 6 * Copyright (C) 2015 Huawei Inc.
7 * Copyright (C) 2017 Nicira, Inc. 7 * Copyright (C) 2017 Nicira, Inc.
8 */ 8 */
9 9
10 #undef _GNU_SOURCE 10 #undef _GNU_SOURCE
11 #include <stdio.h> 11 #include <stdio.h>
12 #include <string.h> 12 #include <string.h>
13 13
14 #include "libbpf.h" 14 #include "libbpf.h"
15 #include "libbpf_internal.h" 15 #include "libbpf_internal.h"
16 16
17 /* make sure libbpf doesn't use kernel-only in 17 /* make sure libbpf doesn't use kernel-only integer typedefs */
18 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s 18 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
19 19
20 #define ERRNO_OFFSET(e) ((e) - __LIBBP 20 #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
21 #define ERRCODE_OFFSET(c) ERRNO_OFFSET(L 21 #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
22 #define NR_ERRNO (__LIBBPF_ERRNO__END - 22 #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
23 23
24 static const char *libbpf_strerror_table[NR_ER 24 static const char *libbpf_strerror_table[NR_ERRNO] = {
25 [ERRCODE_OFFSET(LIBELF)] = "Som 25 [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf",
26 [ERRCODE_OFFSET(FORMAT)] = "BPF 26 [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid",
27 [ERRCODE_OFFSET(KVERSION)] = "'ve 27 [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost",
28 [ERRCODE_OFFSET(ENDIAN)] = "End 28 [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch",
29 [ERRCODE_OFFSET(INTERNAL)] = "Int 29 [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf",
30 [ERRCODE_OFFSET(RELOC)] = "Rel 30 [ERRCODE_OFFSET(RELOC)] = "Relocation failed",
31 [ERRCODE_OFFSET(VERIFY)] = "Ker 31 [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading",
32 [ERRCODE_OFFSET(PROG2BIG)] = "Pro 32 [ERRCODE_OFFSET(PROG2BIG)] = "Program too big",
33 [ERRCODE_OFFSET(KVER)] = "Inc 33 [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version",
34 [ERRCODE_OFFSET(PROGTYPE)] = "Ker 34 [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type",
35 [ERRCODE_OFFSET(WRNGPID)] = "Wro 35 [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message",
36 [ERRCODE_OFFSET(INVSEQ)] = "Inv 36 [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence",
37 [ERRCODE_OFFSET(NLPARSE)] = "Inc 37 [ERRCODE_OFFSET(NLPARSE)] = "Incorrect netlink message parsing",
38 }; 38 };
39 39
40 int libbpf_strerror(int err, char *buf, size_t 40 int libbpf_strerror(int err, char *buf, size_t size)
41 { 41 {
42 int ret; 42 int ret;
43 43
44 if (!buf || !size) 44 if (!buf || !size)
45 return libbpf_err(-EINVAL); 45 return libbpf_err(-EINVAL);
46 46
47 err = err > 0 ? err : -err; 47 err = err > 0 ? err : -err;
48 48
49 if (err < __LIBBPF_ERRNO__START) { 49 if (err < __LIBBPF_ERRNO__START) {
50 ret = strerror_r(err, buf, siz 50 ret = strerror_r(err, buf, size);
51 buf[size - 1] = '\0'; 51 buf[size - 1] = '\0';
52 return libbpf_err_errno(ret); 52 return libbpf_err_errno(ret);
53 } 53 }
54 54
55 if (err < __LIBBPF_ERRNO__END) { 55 if (err < __LIBBPF_ERRNO__END) {
56 const char *msg; 56 const char *msg;
57 57
58 msg = libbpf_strerror_table[ER 58 msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
59 ret = snprintf(buf, size, "%s" 59 ret = snprintf(buf, size, "%s", msg);
60 buf[size - 1] = '\0'; 60 buf[size - 1] = '\0';
61 /* The length of the buf and m 61 /* The length of the buf and msg is positive.
62 * A negative number may be re 62 * A negative number may be returned only when the
63 * size exceeds INT_MAX. Not l 63 * size exceeds INT_MAX. Not likely to appear.
64 */ 64 */
65 if (ret >= size) 65 if (ret >= size)
66 return libbpf_err(-ERA 66 return libbpf_err(-ERANGE);
67 return 0; 67 return 0;
68 } 68 }
69 69
70 ret = snprintf(buf, size, "Unknown lib 70 ret = snprintf(buf, size, "Unknown libbpf error %d", err);
71 buf[size - 1] = '\0'; 71 buf[size - 1] = '\0';
72 if (ret >= size) 72 if (ret >= size)
73 return libbpf_err(-ERANGE); 73 return libbpf_err(-ERANGE);
74 return libbpf_err(-ENOENT); 74 return libbpf_err(-ENOENT);
75 } 75 }
76 76
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