+static u32
+scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
+{
+ ASSERT (!pool_is_free_index (sb->holes, hole - sb->holes));
+ return hole - sb->holes;
+}
+
+static u32
+scoreboard_hole_bytes (sack_scoreboard_hole_t * hole)
+{
+ return hole->end - hole->start;
+}
+
+sack_scoreboard_hole_t *
+scoreboard_get_hole (sack_scoreboard_t * sb, u32 index)
+{
+ if (index != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, index);
+ return 0;
+}
+
+sack_scoreboard_hole_t *
+scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
+{
+ if (hole->next != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, hole->next);
+ return 0;
+}
+
+sack_scoreboard_hole_t *
+scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
+{
+ if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, hole->prev);
+ return 0;
+}
+
+sack_scoreboard_hole_t *
+scoreboard_first_hole (sack_scoreboard_t * sb)
+{
+ if (sb->head != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, sb->head);
+ return 0;
+}
+
+sack_scoreboard_hole_t *
+scoreboard_last_hole (sack_scoreboard_t * sb)
+{
+ if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, sb->tail);
+ return 0;
+}
+
+static void