return nf_tcp_log_invalid(skb, ct, hook_state, sender, NFCT_TCP_IGNORE,
"ignored ACK under lower bound %u (possible overly delayed)",
receiver->td_end - MAXACKWINDOW(sender) - 1);
- if (1) {
- /*
- * Take into account window scaling (RFC 1323).
- */
- if (!tcph->syn)
- win <<= sender->td_scale;
-
- /*
- * Update sender data.
- */
- swin = win + (sack - ack);
- if (sender->td_maxwin < swin)
- sender->td_maxwin = swin;
- if (after(end, sender->td_end)) {
- sender->td_end = end;
- sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
- }
- if (tcph->ack) {
- if (!(sender->flags & IP_CT_TCP_FLAG_MAXACK_SET)) {
- sender->td_maxack = ack;
- sender->flags |= IP_CT_TCP_FLAG_MAXACK_SET;
- } else if (after(ack, sender->td_maxack))
- sender->td_maxack = ack;
- }
- /*
- * Update receiver data.
- */
- if (receiver->td_maxwin != 0 && after(end, sender->td_maxend))
- receiver->td_maxwin += end - sender->td_maxend;
- if (after(sack + win, receiver->td_maxend - 1)) {
- receiver->td_maxend = sack + win;
- if (win == 0)
- receiver->td_maxend++;
+ /* Take into account window scaling (RFC 1323). */
+ if (!tcph->syn)
+ win <<= sender->td_scale;
+
+ /* Update sender data. */
+ swin = win + (sack - ack);
+ if (sender->td_maxwin < swin)
+ sender->td_maxwin = swin;
+ if (after(end, sender->td_end)) {
+ sender->td_end = end;
+ sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
+ }
+ if (tcph->ack) {
+ if (!(sender->flags & IP_CT_TCP_FLAG_MAXACK_SET)) {
+ sender->td_maxack = ack;
+ sender->flags |= IP_CT_TCP_FLAG_MAXACK_SET;
+ } else if (after(ack, sender->td_maxack)) {
+ sender->td_maxack = ack;
}
- if (ack == receiver->td_end)
- receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
+ }
- /*
- * Check retransmissions.
- */
- if (index == TCP_ACK_SET) {
- if (state->last_dir == dir
- && state->last_seq == seq
- && state->last_ack == ack
- && state->last_end == end
- && state->last_win == win_raw)
- state->retrans++;
- else {
- state->last_dir = dir;
- state->last_seq = seq;
- state->last_ack = ack;
- state->last_end = end;
- state->last_win = win_raw;
- state->retrans = 0;
- }
+ /* Update receiver data. */
+ if (receiver->td_maxwin != 0 && after(end, sender->td_maxend))
+ receiver->td_maxwin += end - sender->td_maxend;
+ if (after(sack + win, receiver->td_maxend - 1)) {
+ receiver->td_maxend = sack + win;
+ if (win == 0)
+ receiver->td_maxend++;
+ }
+ if (ack == receiver->td_end)
+ receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
+
+ /* Check retransmissions. */
+ if (index == TCP_ACK_SET) {
+ if (state->last_dir == dir &&
+ state->last_seq == seq &&
+ state->last_ack == ack &&
+ state->last_end == end &&
+ state->last_win == win_raw) {
+ state->retrans++;
+ } else {
+ state->last_dir = dir;
+ state->last_seq = seq;
+ state->last_ack = ack;
+ state->last_end = end;
+ state->last_win = win_raw;
+ state->retrans = 0;
}
}