// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) /* * Copyright (C) 2013-2015 Alexei Starovoitov * Copyright (C) 2015 Wang Nan * Copyright (C) 2015 Huawei Inc. * Copyright (C) 2017 Nicira, Inc. */ #undef _GNU_SOURCE #include #include #include #include #include #include "libbpf.h" #include "libbpf_internal.h" #ifndef ENOTSUPP #define ENOTSUPP 524 #endif /* 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) static const char *libbpf_strerror_table[NR_ERRNO] = { [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf", [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid", [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost", [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch", [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf", [ERRCODE_OFFSET(RELOC)] = "Relocation failed", [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading", [ERRCODE_OFFSET(PROG2BIG)] = "Program too big", [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version", [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type", [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message", [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence", [ERRCODE_OFFSET(NLPARSE)] = "Incorrect netlink message parsing", }; int libbpf_strerror(int err, char *buf, size_t size) { int ret; if (!buf || !size) return libbpf_err(-EINVAL); err = err > 0 ? err : -err; if (err < __LIBBPF_ERRNO__START) { ret = strerror_r(err, buf, size); buf[size - 1] = '\0'; return libbpf_err_errno(ret); } if (err < __LIBBPF_ERRNO__END) { const char *msg; msg = libbpf_strerror_table[ERRNO_OFFSET(err)]; ret = snprintf(buf, size, "%s", msg); buf[size - 1] = '\0'; /* The length of the buf and msg is positive. * A negative number may be returned only when the * size exceeds INT_MAX. Not likely to appear. */ if (ret >= size) return libbpf_err(-ERANGE); return 0; } ret = snprintf(buf, size, "Unknown libbpf error %d", err); buf[size - 1] = '\0'; if (ret >= size) return libbpf_err(-ERANGE); return libbpf_err(-ENOENT); } const char *libbpf_errstr(int err) { static __thread char buf[12]; if (err > 0) err = -err; switch (err) { case -E2BIG: return "-E2BIG"; case -EACCES: return "-EACCES"; case -EADDRINUSE: return "-EADDRINUSE"; case -EADDRNOTAVAIL: return "-EADDRNOTAVAIL"; case -EAGAIN: return "-EAGAIN"; case -EALREADY: return "-EALREADY"; case -EBADF: return "-EBADF"; case -EBADFD: return "-EBADFD"; case -EBUSY: return "-EBUSY"; case -ECANCELED: return "-ECANCELED"; case -ECHILD: return "-ECHILD"; case -EDEADLK: return "-EDEADLK"; case -EDOM: return "-EDOM"; case -EEXIST: return "-EEXIST"; case -EFAULT: return "-EFAULT"; case -EFBIG: return "-EFBIG"; case -EILSEQ: return "-EILSEQ"; case -EINPROGRESS: return "-EINPROGRESS"; case -EINTR: return "-EINTR"; case -EINVAL: return "-EINVAL"; case -EIO: return "-EIO"; case -EISDIR: return "-EISDIR"; case -ELOOP: return "-ELOOP"; case -EMFILE: return "-EMFILE"; case -EMLINK: return "-EMLINK"; case -EMSGSIZE: return "-EMSGSIZE"; case -ENAMETOOLONG: return "-ENAMETOOLONG"; case -ENFILE: return "-ENFILE"; case -ENODATA: return "-ENODATA"; case -ENODEV: return "-ENODEV"; case -ENOENT: return "-ENOENT"; case -ENOEXEC: return "-ENOEXEC"; case -ENOLINK: return "-ENOLINK"; case -ENOMEM: return "-ENOMEM"; case -ENOSPC: return "-ENOSPC"; case -ENOTBLK: return "-ENOTBLK"; case -ENOTDIR: return "-ENOTDIR"; case -ENOTSUPP: return "-ENOTSUPP"; case -ENOTTY: return "-ENOTTY"; case -ENXIO: return "-ENXIO"; case -EOPNOTSUPP: return "-EOPNOTSUPP"; case -EOVERFLOW: return "-EOVERFLOW"; case -EPERM: return "-EPERM"; case -EPIPE: return "-EPIPE"; case -EPROTO: return "-EPROTO"; case -EPROTONOSUPPORT: return "-EPROTONOSUPPORT"; case -ERANGE: return "-ERANGE"; case -EROFS: return "-EROFS"; case -ESPIPE: return "-ESPIPE"; case -ESRCH: return "-ESRCH"; case -ETXTBSY: return "-ETXTBSY"; case -EUCLEAN: return "-EUCLEAN"; case -EXDEV: return "-EXDEV"; default: snprintf(buf, sizeof(buf), "%d", err); return buf; } } #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wpacked" #pragma GCC diagnostic ignored "-Wattributes" struct __packed_u32 { __u32 __val; } __attribute__((packed)); #pragma GCC diagnostic pop #define get_unaligned_be32(p) be32_to_cpu((((struct __packed_u32 *)(p))->__val)) #define put_unaligned_be32(v, p) do { \ ((struct __packed_u32 *)(p))->__val = cpu_to_be32(v); \ } while (0) #define SHA256_BLOCK_LENGTH 64 #define Ch(x, y, z) (((x) & (y)) ^ (~(x) & (z))) #define Maj(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z))) #define Sigma_0(x) (ror32((x), 2) ^ ror32((x), 13) ^ ror32((x), 22)) #define Sigma_1(x) (ror32((x), 6) ^ ror32((x), 11) ^ ror32((x), 25)) #define sigma_0(x) (ror32((x), 7) ^ ror32((x), 18) ^ ((x) >> 3)) #define sigma_1(x) (ror32((x), 17) ^ ror32((x), 19) ^ ((x) >> 10)) static const __u32 sha256_K[64] = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2, }; #define SHA256_ROUND(i, a, b, c, d, e, f, g, h) \ { \ __u32 tmp = h + Sigma_1(e) + Ch(e, f, g) + sha256_K[i] + w[i]; \ d += tmp; \ h = tmp + Sigma_0(a) + Maj(a, b, c); \ } static void sha256_blocks(__u32 state[8], const __u8 *data, size_t nblocks) { while (nblocks--) { __u32 a = state[0]; __u32 b = state[1]; __u32 c = state[2]; __u32 d = state[3]; __u32 e = state[4]; __u32 f = state[5]; __u32 g = state[6]; __u32 h = state[7]; __u32 w[64]; int i; for (i = 0; i < 16; i++) w[i] = get_unaligned_be32(&data[4 * i]); for (; i < ARRAY_SIZE(w); i++) w[i] = sigma_1(w[i - 2]) + w[i - 7] + sigma_0(w[i - 15]) + w[i - 16]; for (i = 0; i < ARRAY_SIZE(w); i += 8) { SHA256_ROUND(i + 0, a, b, c, d, e, f, g, h); SHA256_ROUND(i + 1, h, a, b, c, d, e, f, g); SHA256_ROUND(i + 2, g, h, a, b, c, d, e, f); SHA256_ROUND(i + 3, f, g, h, a, b, c, d, e); SHA256_ROUND(i + 4, e, f, g, h, a, b, c, d); SHA256_ROUND(i + 5, d, e, f, g, h, a, b, c); SHA256_ROUND(i + 6, c, d, e, f, g, h, a, b); SHA256_ROUND(i + 7, b, c, d, e, f, g, h, a); } state[0] += a; state[1] += b; state[2] += c; state[3] += d; state[4] += e; state[5] += f; state[6] += g; state[7] += h; data += SHA256_BLOCK_LENGTH; } } void libbpf_sha256(const void *data, size_t len, __u8 out[SHA256_DIGEST_LENGTH]) { __u32 state[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 }; const __be64 bitcount = cpu_to_be64((__u64)len * 8); __u8 final_data[2 * SHA256_BLOCK_LENGTH] = { 0 }; size_t final_len = len % SHA256_BLOCK_LENGTH; int i; sha256_blocks(state, data, len / SHA256_BLOCK_LENGTH); memcpy(final_data, data + len - final_len, final_len); final_data[final_len] = 0x80; final_len = roundup(final_len + 9, SHA256_BLOCK_LENGTH); memcpy(&final_data[final_len - 8], &bitcount, 8); sha256_blocks(state, final_data, final_len / SHA256_BLOCK_LENGTH); for (i = 0; i < ARRAY_SIZE(state); i++) put_unaligned_be32(state[i], &out[4 * i]); }