user: What would the C source look like for the assembly code provided here:

```asm
<__bpf_l4v6_hash>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  cmpl   $0x0,-0x2c(%rbp)
  je     L91
  mov    $0x0,%edi
  call   <vlan_hdr_shift@plt>
  jmp    L76
L91:
  mov    $0x0,%eax
L76:
  mov    %eax,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  lea    0x36(%rax),%edx
  mov    D171(%rip),%rax
  mov    (%rax),%rcx
  mov    D28(%rip),%rax
  mov    (%rax),%rax
  add    %rax,%rcx
  mov    D139(%rip),%rax
  mov    (%rax),%rax
  add    %rcx,%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <BPF_STMT@plt>
  mov    %eax,-0x14(%rbp)
  lea    -0x14(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <__add_inst@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x0,-0x10(%rbp)
  jne    L71
  mov    D83(%rip),%rax
  mov    (%rax),%edx
  mov    D152(%rip),%rax
  mov    (%rax),%eax
  add    %eax,%edx
  mov    D171(%rip),%rax
  mov    (%rax),%rcx
  mov    D70(%rip),%rax
  mov    (%rax),%rax
  add    %rax,%rcx
  mov    D139(%rip),%rax
  mov    (%rax),%rax
  add    %rcx,%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <BPF_STMT@plt>
  mov    %eax,-0x14(%rbp)
  lea    -0x14(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <__add_inst@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x0,-0x10(%rbp)
  jne    L62
  mov    -0xc(%rbp),%eax
  lea    0x38(%rax),%edx
  mov    D171(%rip),%rax
  mov    (%rax),%rcx
  mov    D28(%rip),%rax
  mov    (%rax),%rax
  add    %rax,%rcx
  mov    D139(%rip),%rax
  mov    (%rax),%rax
  add    %rcx,%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <BPF_STMT@plt>
  mov    %eax,-0x14(%rbp)
  lea    -0x14(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <__add_inst@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x0,-0x10(%rbp)
  jne    L6
  mov    D83(%rip),%rax
  mov    (%rax),%edx
  mov    D152(%rip),%rax
  mov    (%rax),%eax
  add    %eax,%edx
  mov    D171(%rip),%rax
  mov    (%rax),%rcx
  mov    D70(%rip),%rax
  mov    (%rax),%rax
  add    %rax,%rcx
  mov    D139(%rip),%rax
  mov    (%rax),%rax
  add    %rcx,%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <BPF_STMT@plt>
  mov    %eax,-0x14(%rbp)
  lea    -0x14(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <__add_inst@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x0,-0x10(%rbp)
  jne    L104
  mov    D118(%rip),%rax
  mov    (%rax),%rdx
  mov    D63(%rip),%rax
  mov    (%rax),%rax
  add    %rdx,%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <BPF_STMT@plt>
  mov    %eax,-0x14(%rbp)
  lea    -0x14(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <__add_inst@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x0,-0x10(%rbp)
  jne    L84
  mov    $0x0,%eax
  jmp    L63
L71:
  nop
  jmp    L120
L62:
  nop
  jmp    L120
L6:
  nop
  jmp    L120
L104:
  nop
  jmp    L120
L84:
  nop
L120:
  mov    -0x10(%rbp),%eax
L63:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L19
  call   <__stack_chk_fail@plt>
L19:
  leave
  ret
```

assistant: ```c
int __bpf_l4v6_hash(struct sock_fprog *fprog, bool vlan) {
  int vlan_shift = vlan ? vlan_hdr_shift(0) : 0;
  int err;
  {
    struct sock_filter inst = BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 54 + vlan_shift);
    err = __add_inst(fprog, &inst);
    if (err)
      goto err_add_inst;
  };
  {
    struct sock_filter inst = BPF_STMT(BPF_LD + BPF_B + BPF_ABS, SKF_AD_OFF + SKF_AD_ALU_XOR_X);
    err = __add_inst(fprog, &inst);
    if (err)
      goto err_add_inst;
  };
  {
    struct sock_filter inst = BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 56 + vlan_shift);
    err = __add_inst(fprog, &inst);
    if (err)
      goto err_add_inst;
  };
  {
    struct sock_filter inst = BPF_STMT(BPF_LD + BPF_B + BPF_ABS, SKF_AD_OFF + SKF_AD_ALU_XOR_X);
    err = __add_inst(fprog, &inst);
    if (err)
      goto err_add_inst;
  };
  {
    struct sock_filter inst = BPF_STMT(BPF_MISC + BPF_TAX, 0);
    err = __add_inst(fprog, &inst);
    if (err)
      goto err_add_inst;
  };
  ;
  return 0;
err_add_inst:
  return err;
}
```