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