sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
u8 snd_sack_pos; /**< Position in vec of first block to send */
+ sack_block_t *snd_sacks_fl; /**< Vector for building new list */
sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
u16 rcv_dupacks; /**< Number of DUPACKs received */