PREQ_TSEQ
!HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) ||
hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
ADDWORD(frm, PREQ_TSEQ(i));
PREQ_TSEQ(0) = 0;