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/* 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__ */
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