00000000000006c0 <ng_pptpgre_xmit>:
     6c0:	push   %rbp
     6c1:	mov    %rsp,%rbp
     6c4:	push   %r15
     6c6:	push   %r14
     6c8:	mov    %rdx,%r14
     6cb:	push   %r13
     6cd:	mov    %rdi,%r13
     6d0:	push   %r12
     6d2:	mov    %rsi,%r12
     6d5:	push   %rbx
     6d6:	sub    $0x28,%rsp
     6da:	mov    0x28(%rdi),%rbx
     6de:	test   %rsi,%rsi
     6e1:	je     910 <ng_pptpgre_xmit+0x250>
     6e7:	mov    0xfc(%rbx),%eax
     6ed:	movzwl 0x2c(%rbx),%edx
     6f1:	mov    %eax,%r15d
     6f4:	sub    0x100(%rbx),%r15d
     6fb:	cmp    %edx,%r15d