| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __BPF_RAND__ |
| #define __BPF_RAND__ |
| |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <time.h> |
| |
| static inline uint64_t bpf_rand_mask(uint64_t mask) |
| { |
| return (((uint64_t)(uint32_t)rand()) | |
| ((uint64_t)(uint32_t)rand() << 32)) & mask; |
| } |
| |
| #define bpf_rand_ux(x, m) \ |
| static inline uint64_t bpf_rand_u##x(int shift) \ |
| { \ |
| return bpf_rand_mask((m)) << shift; \ |
| } |
| |
| bpf_rand_ux( 8, 0xffULL) |
| bpf_rand_ux(16, 0xffffULL) |
| bpf_rand_ux(24, 0xffffffULL) |
| bpf_rand_ux(32, 0xffffffffULL) |
| bpf_rand_ux(40, 0xffffffffffULL) |
| bpf_rand_ux(48, 0xffffffffffffULL) |
| bpf_rand_ux(56, 0xffffffffffffffULL) |
| bpf_rand_ux(64, 0xffffffffffffffffULL) |
| |
| static inline void bpf_semi_rand_init(void) |
| { |
| srand(time(NULL)); |
| } |
| |
| static inline uint64_t bpf_semi_rand_get(void) |
| { |
| switch (rand() % 39) { |
| case 0: return 0x000000ff00000000ULL | bpf_rand_u8(0); |
| case 1: return 0xffffffff00000000ULL | bpf_rand_u16(0); |
| case 2: return 0x00000000ffff0000ULL | bpf_rand_u16(0); |
| case 3: return 0x8000000000000000ULL | bpf_rand_u32(0); |
| case 4: return 0x00000000f0000000ULL | bpf_rand_u32(0); |
| case 5: return 0x0000000100000000ULL | bpf_rand_u24(0); |
| case 6: return 0x800ff00000000000ULL | bpf_rand_u32(0); |
| case 7: return 0x7fffffff00000000ULL | bpf_rand_u32(0); |
| case 8: return 0xffffffffffffff00ULL ^ bpf_rand_u32(24); |
| case 9: return 0xffffffffffffff00ULL | bpf_rand_u8(0); |
| case 10: return 0x0000000010000000ULL | bpf_rand_u32(0); |
| case 11: return 0xf000000000000000ULL | bpf_rand_u8(0); |
| case 12: return 0x0000f00000000000ULL | bpf_rand_u8(8); |
| case 13: return 0x000000000f000000ULL | bpf_rand_u8(16); |
| case 14: return 0x0000000000000f00ULL | bpf_rand_u8(32); |
| case 15: return 0x00fff00000000f00ULL | bpf_rand_u8(48); |
| case 16: return 0x00007fffffffffffULL ^ bpf_rand_u32(1); |
| case 17: return 0xffff800000000000ULL | bpf_rand_u8(4); |
| case 18: return 0xffff800000000000ULL | bpf_rand_u8(20); |
| case 19: return (0xffffffc000000000ULL + 0x80000ULL) | bpf_rand_u32(0); |
| case 20: return (0xffffffc000000000ULL - 0x04000000ULL) | bpf_rand_u32(0); |
| case 21: return 0x0000000000000000ULL | bpf_rand_u8(55) | bpf_rand_u32(20); |
| case 22: return 0xffffffffffffffffULL ^ bpf_rand_u8(3) ^ bpf_rand_u32(40); |
| case 23: return 0x0000000000000000ULL | bpf_rand_u8(bpf_rand_u8(0) % 64); |
| case 24: return 0x0000000000000000ULL | bpf_rand_u16(bpf_rand_u8(0) % 64); |
| case 25: return 0xffffffffffffffffULL ^ bpf_rand_u8(bpf_rand_u8(0) % 64); |
| case 26: return 0xffffffffffffffffULL ^ bpf_rand_u40(bpf_rand_u8(0) % 64); |
| case 27: return 0x0000800000000000ULL; |
| case 28: return 0x8000000000000000ULL; |
| case 29: return 0x0000000000000000ULL; |
| case 30: return 0xffffffffffffffffULL; |
| case 31: return bpf_rand_u16(bpf_rand_u8(0) % 64); |
| case 32: return bpf_rand_u24(bpf_rand_u8(0) % 64); |
| case 33: return bpf_rand_u32(bpf_rand_u8(0) % 64); |
| case 34: return bpf_rand_u40(bpf_rand_u8(0) % 64); |
| case 35: return bpf_rand_u48(bpf_rand_u8(0) % 64); |
| case 36: return bpf_rand_u56(bpf_rand_u8(0) % 64); |
| case 37: return bpf_rand_u64(bpf_rand_u8(0) % 64); |
| default: return bpf_rand_u64(0); |
| } |
| } |
| |
| #endif /* __BPF_RAND__ */ |
