sack_filter_clear
sack_filter_clear(&bbr->r_ctl.bbr_sf, th->th_ack);
sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una);
sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una);
sack_filter_clear(&bbr->r_ctl.bbr_sf, th_ack);
sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una);
sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una);
sack_filter_clear(&rack->r_ctl.rack_sf, th_ack);
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
sack_filter_clear(&rack->r_ctl.rack_sf, th->th_ack);
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
sack_filter_clear(&sf, 0);
sack_filter_clear(&sf, tp.snd_una);
sack_filter_clear(&sf, tp.snd_una);
void sack_filter_clear(struct sack_filter *sf, tcp_seq seq);