/* Adapt the MSS value used to make delayed ack decision to the
* real world.
*/
-static void tcp_measure_rcv_mss(struct sock *sk,
- const struct sk_buff *skb)
+static void tcp_measure_rcv_mss(struct sock *sk, const struct sk_buff *skb)
{
struct inet_connection_sock *icsk = inet_csk(sk);
const unsigned int lss = icsk->icsk_ack.last_seg_size;
/* skb->len may jitter because of SACKs, even if peer
* sends good full-sized frames.
*/
- len = skb_shinfo(skb)->gso_size ?: skb->len;
+ len = skb_shinfo(skb)->gso_size ? : skb->len;
if (len >= icsk->icsk_ack.rcv_mss) {
icsk->icsk_ack.rcv_mss = len;
} else {
struct inet_connection_sock *icsk = inet_csk(sk);
unsigned quickacks = tcp_sk(sk)->rcv_wnd / (2 * icsk->icsk_ack.rcv_mss);
- if (quickacks==0)
- quickacks=2;
+ if (quickacks == 0)
+ quickacks = 2;
if (quickacks > icsk->icsk_ack.quick)
icsk->icsk_ack.quick = min(quickacks, TCP_MAX_QUICKACKS);
}
static inline void TCP_ECN_queue_cwr(struct tcp_sock *tp)
{
- if (tp->ecn_flags&TCP_ECN_OK)
+ if (tp->ecn_flags & TCP_ECN_OK)
tp->ecn_flags |= TCP_ECN_QUEUE_CWR;
}
static inline void TCP_ECN_check_ce(struct tcp_sock *tp, struct sk_buff *skb)
{
- if (tp->ecn_flags&TCP_ECN_OK) {
+ if (tp->ecn_flags & TCP_ECN_OK) {
if (INET_ECN_is_ce(TCP_SKB_CB(skb)->flags))
tp->ecn_flags |= TCP_ECN_DEMAND_CWR;
/* Funny extension: if ECT is not set on a segment,
static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, struct tcphdr *th)
{
- if ((tp->ecn_flags&TCP_ECN_OK) && (!th->ece || th->cwr))
+ if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || th->cwr))
tp->ecn_flags &= ~TCP_ECN_OK;
}
static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, struct tcphdr *th)
{
- if ((tp->ecn_flags&TCP_ECN_OK) && (!th->ece || !th->cwr))
+ if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || !th->cwr))
tp->ecn_flags &= ~TCP_ECN_OK;
}
static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock *tp, struct tcphdr *th)
{
- if (th->ece && !th->syn && (tp->ecn_flags&TCP_ECN_OK))
+ if (th->ece && !th->syn && (tp->ecn_flags & TCP_ECN_OK))
return 1;
return 0;
}
return 0;
}
-static void tcp_grow_window(struct sock *sk,
- struct sk_buff *skb)
+static void tcp_grow_window(struct sock *sk, struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
* will fit to rcvbuf in future.
*/
if (tcp_win_from_space(skb->truesize) <= skb->len)
- incr = 2*tp->advmss;
+ incr = 2 * tp->advmss;
else
incr = __tcp_grow_window(sk, skb);
if (incr) {
- tp->rcv_ssthresh = min(tp->rcv_ssthresh + incr, tp->window_clamp);
+ tp->rcv_ssthresh = min(tp->rcv_ssthresh + incr,
+ tp->window_clamp);
inet_csk(sk)->icsk_ack.quick |= 1;
}
}
sysctl_tcp_rmem[2]);
}
if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
- tp->rcv_ssthresh = min(tp->window_clamp, 2U*tp->advmss);
+ tp->rcv_ssthresh = min(tp->window_clamp, 2U * tp->advmss);
}
-
/* Initialize RCV_MSS value.
* RCV_MSS is an our guess about MSS used by the peer.
* We haven't any direct information about the MSS.
struct tcp_sock *tp = tcp_sk(sk);
unsigned int hint = min_t(unsigned int, tp->advmss, tp->mss_cache);
- hint = min(hint, tp->rcv_wnd/2);
+ hint = min(hint, tp->rcv_wnd / 2);
hint = min(hint, TCP_MIN_RCVMSS);
hint = max(hint, TCP_MIN_MSS);
goto new_measure;
if (before(tp->rcv_nxt, tp->rcv_rtt_est.seq))
return;
- tcp_rcv_rtt_update(tp,
- jiffies - tp->rcv_rtt_est.time,
- 1);
+ tcp_rcv_rtt_update(tp, jiffies - tp->rcv_rtt_est.time, 1);
new_measure:
tp->rcv_rtt_est.seq = tp->rcv_nxt + tp->rcv_wnd;
tp->rcv_rtt_est.time = tcp_time_stamp;
}
-static inline void tcp_rcv_rtt_measure_ts(struct sock *sk, const struct sk_buff *skb)
+static inline void tcp_rcv_rtt_measure_ts(struct sock *sk,
+ const struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
if (tp->rx_opt.rcv_tsecr &&
goto new_measure;
time = tcp_time_stamp - tp->rcvq_space.time;
- if (time < (tp->rcv_rtt_est.rtt >> 3) ||
- tp->rcv_rtt_est.rtt == 0)
+ if (time < (tp->rcv_rtt_est.rtt >> 3) || tp->rcv_rtt_est.rtt == 0)
return;
space = 2 * (tp->copied_seq - tp->rcvq_space.seq);
} else {
int m = now - icsk->icsk_ack.lrcvtime;
- if (m <= TCP_ATO_MIN/2) {
+ if (m <= TCP_ATO_MIN / 2) {
/* The fastest case is the first. */
icsk->icsk_ack.ato = (icsk->icsk_ack.ato >> 1) + TCP_ATO_MIN / 2;
} else if (m < icsk->icsk_ack.ato) {
u32 rto_min = TCP_RTO_MIN;
if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
- rto_min = dst->metrics[RTAX_RTO_MIN-1];
+ rto_min = dst->metrics[RTAX_RTO_MIN - 1];
return rto_min;
}
}
if (after(tp->snd_una, tp->rtt_seq)) {
if (tp->mdev_max < tp->rttvar)
- tp->rttvar -= (tp->rttvar-tp->mdev_max)>>2;
+ tp->rttvar -= (tp->rttvar - tp->mdev_max) >> 2;
tp->rtt_seq = tp->snd_nxt;
tp->mdev_max = tcp_rto_min(sk);
}
} else {
/* no previous measure. */
- tp->srtt = m<<3; /* take the measured time to be rtt */
- tp->mdev = m<<1; /* make sure rto = 3*rtt */
+ tp->srtt = m << 3; /* take the measured time to be rtt */
+ tp->mdev = m << 1; /* make sure rto = 3*rtt */
tp->mdev_max = tp->rttvar = max(tp->mdev, tcp_rto_min(sk));
tp->rtt_seq = tp->snd_nxt;
}
dst_confirm(dst);
- if (dst && (dst->flags&DST_HOST)) {
+ if (dst && (dst->flags & DST_HOST)) {
const struct inet_connection_sock *icsk = inet_csk(sk);
int m;
* Reset our results.
*/
if (!(dst_metric_locked(dst, RTAX_RTT)))
- dst->metrics[RTAX_RTT-1] = 0;
+ dst->metrics[RTAX_RTT - 1] = 0;
return;
}
*/
if (!(dst_metric_locked(dst, RTAX_RTT))) {
if (m <= 0)
- dst->metrics[RTAX_RTT-1] = tp->srtt;
+ dst->metrics[RTAX_RTT - 1] = tp->srtt;
else
- dst->metrics[RTAX_RTT-1] -= (m>>3);
+ dst->metrics[RTAX_RTT - 1] -= (m >> 3);
}
if (!(dst_metric_locked(dst, RTAX_RTTVAR))) {
m = tp->mdev;
if (m >= dst_metric(dst, RTAX_RTTVAR))
- dst->metrics[RTAX_RTTVAR-1] = m;
+ dst->metrics[RTAX_RTTVAR - 1] = m;
else
dst->metrics[RTAX_RTTVAR-1] -=
(dst->metrics[RTAX_RTTVAR-1] - m)>>2;
dst->metrics[RTAX_SSTHRESH-1] = tp->snd_cwnd >> 1;
if (!dst_metric_locked(dst, RTAX_CWND) &&
tp->snd_cwnd > dst_metric(dst, RTAX_CWND))
- dst->metrics[RTAX_CWND-1] = tp->snd_cwnd;
+ dst->metrics[RTAX_CWND - 1] = tp->snd_cwnd;
} else if (tp->snd_cwnd > tp->snd_ssthresh &&
icsk->icsk_ca_state == TCP_CA_Open) {
/* Cong. avoidance phase, cwnd is reliable. */
}
if (in_sack <= 0)
- in_sack = tcp_match_skb_to_sack(sk, skb, start_seq, end_seq);
+ in_sack = tcp_match_skb_to_sack(sk, skb, start_seq,
+ end_seq);
if (unlikely(in_sack < 0))
break;
if (in_sack)
- *flag |= tcp_sacktag_one(skb, sk, reord, dup_sack, *fack_count);
+ *flag |= tcp_sacktag_one(skb, sk, reord, dup_sack,
+ *fack_count);
*fack_count += tcp_skb_pcount(skb);
}
}
static int
-tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_una)
+tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb,
+ u32 prior_snd_una)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_sack_block sp[4];
struct tcp_sack_block *cache;
struct sk_buff *skb;
- int num_sacks = (ptr[1] - TCPOLEN_SACK_BASE)>>3;
+ int num_sacks = (ptr[1] - TCPOLEN_SACK_BASE) >> 3;
int used_sacks;
int reord = tp->packets_out;
int flag = 0;
/* order SACK blocks to allow in order walk of the retrans queue */
for (i = used_sacks - 1; i > 0; i--) {
- for (j = 0; j < i; j++){
- if (after(sp[j].start_seq, sp[j+1].start_seq)) {
+ for (j = 0; j < i; j++) {
+ if (after(sp[j].start_seq, sp[j + 1].start_seq)) {
struct tcp_sack_block tmp;
tmp = sp[j];
- sp[j] = sp[j+1];
- sp[j+1] = tmp;
+ sp[j] = sp[j + 1];
+ sp[j + 1] = tmp;
/* Track where the first SACK block goes to */
if (j == first_sack_index)
- first_sack_index = j+1;
+ first_sack_index = j + 1;
}
}
}
/* Head todo? */
if (before(start_seq, cache->start_seq)) {
skb = tcp_sacktag_skip(skb, sk, start_seq);
- skb = tcp_sacktag_walk(skb, sk, next_dup, start_seq,
- cache->start_seq, dup_sack,
- &fack_count, &reord, &flag);
+ skb = tcp_sacktag_walk(skb, sk, next_dup,
+ start_seq,
+ cache->start_seq,
+ dup_sack, &fack_count,
+ &reord, &flag);
}
/* Rest of the block already fully processed? */
if (!after(end_seq, cache->end_seq))
goto advance_sp;
- skb = tcp_maybe_skipping_dsack(skb, sk, next_dup, cache->end_seq,
- &fack_count, &reord, &flag);
+ skb = tcp_maybe_skipping_dsack(skb, sk, next_dup,
+ cache->end_seq,
+ &fack_count, &reord,
+ &flag);
/* ...tail remains todo... */
if (tcp_highest_sack_seq(tp) == cache->end_seq) {
if (acked > 0) {
/* One ACK acked hole. The rest eat duplicate ACKs. */
- if (acked-1 >= tp->sacked_out)
+ if (acked - 1 >= tp->sacked_out)
tp->sacked_out = 0;
else
- tp->sacked_out -= acked-1;
+ tp->sacked_out -= acked - 1;
}
tcp_check_reno_reordering(sk, acked);
tcp_verify_left_out(tp);
tcp_for_write_queue_from(skb, sk) {
if (skb == tcp_send_head(sk))
break;
- if (TCP_SKB_CB(skb)->sacked&TCPCB_RETRANS)
+ if (TCP_SKB_CB(skb)->sacked & TCPCB_RETRANS)
return 0;
/* Short-circuit when first non-SACKed skb has been checked */
- if (!(TCP_SKB_CB(skb)->sacked&TCPCB_SACKED_ACKED))
+ if (!(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED))
break;
}
return 1;
* Count the retransmission made on RTO correctly (only when
* waiting for the first ACK and did not get it)...
*/
- if ((tp->frto_counter == 1) && !(flag&FLAG_DATA_ACKED)) {
+ if ((tp->frto_counter == 1) && !(flag & FLAG_DATA_ACKED)) {
/* For some reason this R-bit might get cleared? */
if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS)
tp->retrans_out += tcp_skb_pcount(skb);
}
/* Don't lost mark skbs that were fwd transmitted after RTO */
- if (!(TCP_SKB_CB(skb)->sacked&TCPCB_SACKED_ACKED) &&
+ if (!(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED) &&
!after(TCP_SKB_CB(skb)->end_seq, tp->frto_highmark)) {
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
tp->lost_out += tcp_skb_pcount(skb);
tp->bytes_acked = 0;
tp->reordering = min_t(unsigned int, tp->reordering,
- sysctl_tcp_reordering);
+ sysctl_tcp_reordering);
tcp_set_ca_state(sk, TCP_CA_Loss);
tp->high_seq = tp->frto_highmark;
TCP_ECN_queue_cwr(tp);
if (skb == tcp_send_head(sk))
break;
- if (TCP_SKB_CB(skb)->sacked&TCPCB_RETRANS)
+ if (TCP_SKB_CB(skb)->sacked & TCPCB_RETRANS)
tp->undo_marker = 0;
TCP_SKB_CB(skb)->sacked &= (~TCPCB_TAGBITS)|TCPCB_SACKED_ACKED;
if (!(TCP_SKB_CB(skb)->sacked&TCPCB_SACKED_ACKED) || how) {
tcp_verify_left_out(tp);
tp->reordering = min_t(unsigned int, tp->reordering,
- sysctl_tcp_reordering);
+ sysctl_tcp_reordering);
tcp_set_ca_state(sk, TCP_CA_Loss);
tp->high_seq = tp->snd_nxt;
TCP_ECN_queue_cwr(tp);
static inline int tcp_fackets_out(struct tcp_sock *tp)
{
- return tcp_is_reno(tp) ? tp->sacked_out+1 : tp->fackets_out;
+ return tcp_is_reno(tp) ? tp->sacked_out + 1 : tp->fackets_out;
}
/* Heurestics to calculate number of duplicate ACKs. There's no dupACKs
* retransmitted past LOST markings in the first place? I'm not fully sure
* about undo and end of connection cases, which can cause R without L?
*/
-static void tcp_verify_retransmit_hint(struct tcp_sock *tp,
- struct sk_buff *skb)
+static void tcp_verify_retransmit_hint(struct tcp_sock *tp, struct sk_buff *skb)
{
if ((tp->retransmit_skb_hint != NULL) &&
before(TCP_SKB_CB(skb)->seq,
- TCP_SKB_CB(tp->retransmit_skb_hint)->seq))
+ TCP_SKB_CB(tp->retransmit_skb_hint)->seq))
tp->retransmit_skb_hint = NULL;
}
cnt += tcp_skb_pcount(skb);
if (((!fast_rexmit || (tp->lost_out > 0)) && (cnt > packets)) ||
- after(TCP_SKB_CB(skb)->end_seq, tp->high_seq))
+ after(TCP_SKB_CB(skb)->end_seq, tp->high_seq))
break;
if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_SACKED_ACKED|TCPCB_LOST))) {
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
static inline void tcp_moderate_cwnd(struct tcp_sock *tp)
{
tp->snd_cwnd = min(tp->snd_cwnd,
- tcp_packets_in_flight(tp)+tcp_max_burst(tp));
+ tcp_packets_in_flight(tp) + tcp_max_burst(tp));
tp->snd_cwnd_stamp = tcp_time_stamp;
}
struct tcp_sock *tp = tcp_sk(sk);
int decr = tp->snd_cwnd_cnt + 1;
- if ((flag&(FLAG_ANY_PROGRESS|FLAG_DSACKING_ACK)) ||
- (tcp_is_reno(tp) && !(flag&FLAG_NOT_DUP))) {
- tp->snd_cwnd_cnt = decr&1;
+ if ((flag & (FLAG_ANY_PROGRESS | FLAG_DSACKING_ACK)) ||
+ (tcp_is_reno(tp) && !(flag & FLAG_NOT_DUP))) {
+ tp->snd_cwnd_cnt = decr & 1;
decr >>= 1;
if (decr && tp->snd_cwnd > tcp_cwnd_min(sk))
tp->snd_cwnd -= decr;
- tp->snd_cwnd = min(tp->snd_cwnd, tcp_packets_in_flight(tp)+1);
+ tp->snd_cwnd = min(tp->snd_cwnd, tcp_packets_in_flight(tp) + 1);
tp->snd_cwnd_stamp = tcp_time_stamp;
}
}
if (icsk->icsk_ca_ops->undo_cwnd)
tp->snd_cwnd = icsk->icsk_ca_ops->undo_cwnd(sk);
else
- tp->snd_cwnd = max(tp->snd_cwnd, tp->snd_ssthresh<<1);
+ tp->snd_cwnd = max(tp->snd_cwnd, tp->snd_ssthresh << 1);
if (undo && tp->prior_ssthresh > tp->snd_ssthresh) {
tp->snd_ssthresh = tp->prior_ssthresh;
static inline int tcp_may_undo(struct tcp_sock *tp)
{
- return tp->undo_marker &&
- (!tp->undo_retrans || tcp_packet_delayed(tp));
+ return tp->undo_marker && (!tp->undo_retrans || tcp_packet_delayed(tp));
}
/* People celebrate: "We love our President!" */
if (tp->retrans_out == 0)
tp->retrans_stamp = 0;
- if (flag&FLAG_ECE)
+ if (flag & FLAG_ECE)
tcp_enter_cwr(sk, 1);
if (inet_csk(sk)->icsk_ca_state != TCP_CA_CWR) {
tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
}
-
/* Process an event, which can update packets-in-flight not trivially.
* Main goal of this function is to calculate new estimate for left_out,
* taking into account both packets sitting in receiver's buffer and
* It does _not_ decide what to send, it is made in function
* tcp_xmit_retransmit_queue().
*/
-static void
-tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag)
+static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
- int is_dupack = !(flag&(FLAG_SND_UNA_ADVANCED|FLAG_NOT_DUP));
- int do_lost = is_dupack || ((flag&FLAG_DATA_SACKED) &&
+ int is_dupack = !(flag & (FLAG_SND_UNA_ADVANCED | FLAG_NOT_DUP));
+ int do_lost = is_dupack || ((flag & FLAG_DATA_SACKED) &&
(tcp_fackets_out(tp) > tp->reordering));
int fast_rexmit = 0;
/* Now state machine starts.
* A. ECE, hence prohibit cwnd undoing, the reduction is required. */
- if (flag&FLAG_ECE)
+ if (flag & FLAG_ECE)
tp->prior_ssthresh = 0;
/* B. In all the states check for reneging SACKs. */
before(tp->snd_una, tp->high_seq) &&
icsk->icsk_ca_state != TCP_CA_Open &&
tp->fackets_out > tp->reordering) {
- tcp_mark_head_lost(sk, tp->fackets_out-tp->reordering, 0);
+ tcp_mark_head_lost(sk, tp->fackets_out - tp->reordering, 0);
NET_INC_STATS_BH(LINUX_MIB_TCPLOSS);
}
do_lost = tcp_try_undo_partial(sk, pkts_acked);
break;
case TCP_CA_Loss:
- if (flag&FLAG_DATA_ACKED)
+ if (flag & FLAG_DATA_ACKED)
icsk->icsk_retransmits = 0;
if (!tcp_try_undo_loss(sk)) {
tcp_moderate_cwnd(tp);
tp->undo_retrans = tp->retrans_out;
if (icsk->icsk_ca_state < TCP_CA_CWR) {
- if (!(flag&FLAG_ECE))
+ if (!(flag & FLAG_ECE))
tp->prior_ssthresh = tcp_current_ssthresh(sk);
tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk);
TCP_ECN_queue_cwr(tp);
if (!tp->packets_out) {
inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS);
} else {
- inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
+ inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+ inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
}
}
flag |= FLAG_RETRANS_DATA_ACKED;
ca_seq_rtt = -1;
seq_rtt = -1;
- if ((flag & FLAG_DATA_ACKED) ||
- (acked_pcount > 1))
+ if ((flag & FLAG_DATA_ACKED) || (acked_pcount > 1))
flag |= FLAG_NONHEAD_RETRANS_ACKED;
} else {
ca_seq_rtt = now - scb->when;
/* Check that window update is acceptable.
* The function assumes that snd_una<=ack<=snd_next.
*/
-static inline int tcp_may_update_window(const struct tcp_sock *tp, const u32 ack,
- const u32 ack_seq, const u32 nwin)
+static inline int tcp_may_update_window(const struct tcp_sock *tp,
+ const u32 ack, const u32 ack_seq,
+ const u32 nwin)
{
return (after(ack, tp->snd_una) ||
after(ack_seq, tp->snd_wl1) ||
static void tcp_undo_spur_to_response(struct sock *sk, int flag)
{
- if (flag&FLAG_ECE)
+ if (flag & FLAG_ECE)
tcp_ratehalving_spur_to_response(sk);
else
tcp_undo_cwr(sk, 1);
tcp_verify_left_out(tp);
/* Duplicate the behavior from Loss state (fastretrans_alert) */
- if (flag&FLAG_DATA_ACKED)
+ if (flag & FLAG_DATA_ACKED)
inet_csk(sk)->icsk_retransmits = 0;
if ((flag & FLAG_NONHEAD_RETRANS_ACKED) ||
* ACK isn't duplicate nor advances window, e.g., opposite dir
* data, winupdate
*/
- if (!(flag&FLAG_ANY_PROGRESS) && (flag&FLAG_NOT_DUP))
+ if (!(flag & FLAG_ANY_PROGRESS) && (flag & FLAG_NOT_DUP))
return 1;
- if (!(flag&FLAG_DATA_ACKED)) {
+ if (!(flag & FLAG_DATA_ACKED)) {
tcp_enter_frto_loss(sk, (tp->frto_counter == 1 ? 0 : 3),
flag);
return 1;
}
} else {
- if (!(flag&FLAG_DATA_ACKED) && (tp->frto_counter == 1)) {
+ if (!(flag & FLAG_DATA_ACKED) && (tp->frto_counter == 1)) {
/* Prevent sending of new data. */
tp->snd_cwnd = min(tp->snd_cwnd,
tcp_packets_in_flight(tp));
}
if ((tp->frto_counter >= 2) &&
- (!(flag&FLAG_FORWARD_PROGRESS) ||
- ((flag&FLAG_DATA_SACKED) && !(flag&FLAG_ONLY_ORIG_SACKED)))) {
+ (!(flag & FLAG_FORWARD_PROGRESS) ||
+ ((flag & FLAG_DATA_SACKED) &&
+ !(flag & FLAG_ONLY_ORIG_SACKED)))) {
/* RFC4138 shortcoming (see comment above) */
- if (!(flag&FLAG_FORWARD_PROGRESS) && (flag&FLAG_NOT_DUP))
+ if (!(flag & FLAG_FORWARD_PROGRESS) &&
+ (flag & FLAG_NOT_DUP))
return 1;
tcp_enter_frto_loss(sk, 3, flag);
tp->bytes_acked += ack - prior_snd_una;
else if (icsk->icsk_ca_state == TCP_CA_Loss)
/* we assume just one segment left network */
- tp->bytes_acked += min(ack - prior_snd_una, tp->mss_cache);
+ tp->bytes_acked += min(ack - prior_snd_una,
+ tp->mss_cache);
}
prior_fackets = tp->fackets_out;
prior_in_flight = tcp_packets_in_flight(tp);
- if (!(flag&FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
+ if (!(flag & FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
/* Window is constant, pure forward advance.
* No more checks are required.
* Note, we use the fact that SND.UNA>=SND.WL2.
if ((flag & FLAG_DATA_ACKED) && !frto_cwnd &&
tcp_may_raise_cwnd(sk, flag))
tcp_cong_avoid(sk, ack, prior_in_flight);
- tcp_fastretrans_alert(sk, prior_packets - tp->packets_out, flag);
+ tcp_fastretrans_alert(sk, prior_packets - tp->packets_out,
+ flag);
} else {
if ((flag & FLAG_DATA_ACKED) && !frto_cwnd)
tcp_cong_avoid(sk, ack, prior_in_flight);
}
- if ((flag & FLAG_FORWARD_PROGRESS) || !(flag&FLAG_NOT_DUP))
+ if ((flag & FLAG_FORWARD_PROGRESS) || !(flag & FLAG_NOT_DUP))
dst_confirm(sk->sk_dst_cache);
return 1;
return 0;
}
-
/* Look for tcp options. Normally only called on SYN and SYNACK packets.
* But, this can also be called on packets in the established flow when
* the fast version below fails.
*/
-void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, int estab)
+void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx,
+ int estab)
{
unsigned char *ptr;
struct tcphdr *th = tcp_hdr(skb);
- int length=(th->doff*4)-sizeof(struct tcphdr);
+ int length = (th->doff * 4) - sizeof(struct tcphdr);
ptr = (unsigned char *)(th + 1);
opt_rx->saw_tstamp = 0;
while (length > 0) {
- int opcode=*ptr++;
+ int opcode = *ptr++;
int opsize;
switch (opcode) {
static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th,
struct tcp_sock *tp)
{
- if (th->doff == sizeof(struct tcphdr)>>2) {
+ if (th->doff == sizeof(struct tcphdr) >> 2) {
tp->rx_opt.saw_tstamp = 0;
return 0;
} else if (tp->rx_opt.tstamp_ok &&
(s32)(tp->rx_opt.ts_recent - tp->rx_opt.rcv_tsval) <= (inet_csk(sk)->icsk_rto * 1024) / HZ);
}
-static inline int tcp_paws_discard(const struct sock *sk, const struct sk_buff *skb)
+static inline int tcp_paws_discard(const struct sock *sk,
+ const struct sk_buff *skb)
{
const struct tcp_sock *tp = tcp_sk(sk);
return ((s32)(tp->rx_opt.ts_recent - tp->rx_opt.rcv_tsval) > TCP_PAWS_WINDOW &&
{
/* We want the right error as BSD sees it (and indeed as we do). */
switch (sk->sk_state) {
- case TCP_SYN_SENT:
- sk->sk_err = ECONNREFUSED;
- break;
- case TCP_CLOSE_WAIT:
- sk->sk_err = EPIPE;
- break;
- case TCP_CLOSE:
- return;
- default:
- sk->sk_err = ECONNRESET;
+ case TCP_SYN_SENT:
+ sk->sk_err = ECONNREFUSED;
+ break;
+ case TCP_CLOSE_WAIT:
+ sk->sk_err = EPIPE;
+ break;
+ case TCP_CLOSE:
+ return;
+ default:
+ sk->sk_err = ECONNRESET;
}
if (!sock_flag(sk, SOCK_DEAD))
sock_set_flag(sk, SOCK_DONE);
switch (sk->sk_state) {
- case TCP_SYN_RECV:
- case TCP_ESTABLISHED:
- /* Move to CLOSE_WAIT */
- tcp_set_state(sk, TCP_CLOSE_WAIT);
- inet_csk(sk)->icsk_ack.pingpong = 1;
- break;
+ case TCP_SYN_RECV:
+ case TCP_ESTABLISHED:
+ /* Move to CLOSE_WAIT */
+ tcp_set_state(sk, TCP_CLOSE_WAIT);
+ inet_csk(sk)->icsk_ack.pingpong = 1;
+ break;
- case TCP_CLOSE_WAIT:
- case TCP_CLOSING:
- /* Received a retransmission of the FIN, do
- * nothing.
- */
- break;
- case TCP_LAST_ACK:
- /* RFC793: Remain in the LAST-ACK state. */
- break;
+ case TCP_CLOSE_WAIT:
+ case TCP_CLOSING:
+ /* Received a retransmission of the FIN, do
+ * nothing.
+ */
+ break;
+ case TCP_LAST_ACK:
+ /* RFC793: Remain in the LAST-ACK state. */
+ break;
- case TCP_FIN_WAIT1:
- /* This case occurs when a simultaneous close
- * happens, we must ack the received FIN and
- * enter the CLOSING state.
- */
- tcp_send_ack(sk);
- tcp_set_state(sk, TCP_CLOSING);
- break;
- case TCP_FIN_WAIT2:
- /* Received a FIN -- send ACK and enter TIME_WAIT. */
- tcp_send_ack(sk);
- tcp_time_wait(sk, TCP_TIME_WAIT, 0);
- break;
- default:
- /* Only TCP_LISTEN and TCP_CLOSE are left, in these
- * cases we should never reach this piece of code.
- */
- printk(KERN_ERR "%s: Impossible, sk->sk_state=%d\n",
- __FUNCTION__, sk->sk_state);
- break;
+ case TCP_FIN_WAIT1:
+ /* This case occurs when a simultaneous close
+ * happens, we must ack the received FIN and
+ * enter the CLOSING state.
+ */
+ tcp_send_ack(sk);
+ tcp_set_state(sk, TCP_CLOSING);
+ break;
+ case TCP_FIN_WAIT2:
+ /* Received a FIN -- send ACK and enter TIME_WAIT. */
+ tcp_send_ack(sk);
+ tcp_time_wait(sk, TCP_TIME_WAIT, 0);
+ break;
+ default:
+ /* Only TCP_LISTEN and TCP_CLOSE are left, in these
+ * cases we should never reach this piece of code.
+ */
+ printk(KERN_ERR "%s: Impossible, sk->sk_state=%d\n",
+ __FUNCTION__, sk->sk_state);
+ break;
}
/* It _is_ possible, that we have something out-of-order _after_ FIN.
}
}
-static inline int tcp_sack_extend(struct tcp_sack_block *sp, u32 seq, u32 end_seq)
+static inline int tcp_sack_extend(struct tcp_sack_block *sp, u32 seq,
+ u32 end_seq)
{
if (!after(seq, sp->end_seq) && !after(sp->start_seq, end_seq)) {
if (before(seq, sp->start_seq))
tp->rx_opt.dsack = 1;
tp->duplicate_sack[0].start_seq = seq;
tp->duplicate_sack[0].end_seq = end_seq;
- tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks + 1, 4 - tp->rx_opt.tstamp_ok);
+ tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks + 1,
+ 4 - tp->rx_opt.tstamp_ok);
}
}
{
int this_sack;
struct tcp_sack_block *sp = &tp->selective_acks[0];
- struct tcp_sack_block *swalk = sp+1;
+ struct tcp_sack_block *swalk = sp + 1;
/* See if the recent change to the first SACK eats into
* or hits the sequence space of other SACK blocks, if so coalesce.
*/
- for (this_sack = 1; this_sack < tp->rx_opt.num_sacks; ) {
+ for (this_sack = 1; this_sack < tp->rx_opt.num_sacks;) {
if (tcp_sack_extend(sp, swalk->start_seq, swalk->end_seq)) {
int i;
* Decrease num_sacks.
*/
tp->rx_opt.num_sacks--;
- tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks + tp->rx_opt.dsack, 4 - tp->rx_opt.tstamp_ok);
- for (i=this_sack; i < tp->rx_opt.num_sacks; i++)
- sp[i] = sp[i+1];
+ tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks +
+ tp->rx_opt.dsack,
+ 4 - tp->rx_opt.tstamp_ok);
+ for (i = this_sack; i < tp->rx_opt.num_sacks; i++)
+ sp[i] = sp[i + 1];
continue;
}
this_sack++, swalk++;
}
}
-static inline void tcp_sack_swap(struct tcp_sack_block *sack1, struct tcp_sack_block *sack2)
+static inline void tcp_sack_swap(struct tcp_sack_block *sack1,
+ struct tcp_sack_block *sack2)
{
__u32 tmp;
if (!cur_sacks)
goto new_sack;
- for (this_sack=0; this_sack<cur_sacks; this_sack++, sp++) {
+ for (this_sack = 0; this_sack < cur_sacks; this_sack++, sp++) {
if (tcp_sack_extend(sp, seq, end_seq)) {
/* Rotate this_sack to the first one. */
- for (; this_sack>0; this_sack--, sp--)
- tcp_sack_swap(sp, sp-1);
+ for (; this_sack > 0; this_sack--, sp--)
+ tcp_sack_swap(sp, sp - 1);
if (cur_sacks > 1)
tcp_sack_maybe_coalesce(tp);
return;
sp--;
}
for (; this_sack > 0; this_sack--, sp--)
- *sp = *(sp-1);
+ *sp = *(sp - 1);
new_sack:
/* Build the new head SACK, and we're done. */
sp->start_seq = seq;
sp->end_seq = end_seq;
tp->rx_opt.num_sacks++;
- tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks + tp->rx_opt.dsack, 4 - tp->rx_opt.tstamp_ok);
+ tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks + tp->rx_opt.dsack,
+ 4 - tp->rx_opt.tstamp_ok);
}
/* RCV.NXT advances, some SACKs should be eaten. */
return;
}
- for (this_sack = 0; this_sack < num_sacks; ) {
+ for (this_sack = 0; this_sack < num_sacks;) {
/* Check if the start of the sack is covered by RCV.NXT. */
if (!before(tp->rcv_nxt, sp->start_seq)) {
int i;
}
if (num_sacks != tp->rx_opt.num_sacks) {
tp->rx_opt.num_sacks = num_sacks;
- tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks + tp->rx_opt.dsack, 4 - tp->rx_opt.tstamp_ok);
+ tp->rx_opt.eff_sacks = min(tp->rx_opt.num_sacks +
+ tp->rx_opt.dsack,
+ 4 - tp->rx_opt.tstamp_ok);
}
}
if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq)
goto drop;
- __skb_pull(skb, th->doff*4);
+ __skb_pull(skb, th->doff * 4);
TCP_ECN_accept_cwr(tp, skb);
if (tp->rx_opt.dsack) {
tp->rx_opt.dsack = 0;
tp->rx_opt.eff_sacks = min_t(unsigned int, tp->rx_opt.num_sacks,
- 4 - tp->rx_opt.tstamp_ok);
+ 4 - tp->rx_opt.tstamp_ok);
}
/* Queue data for delivery to the user.
tp->copied_seq == tp->rcv_nxt && tp->ucopy.len &&
sock_owned_by_user(sk) && !tp->urg_data) {
int chunk = min_t(unsigned int, skb->len,
- tp->ucopy.len);
+ tp->ucopy.len);
__set_current_state(TASK_RUNNING);
tp->selective_acks[0].end_seq =
TCP_SKB_CB(skb)->end_seq;
}
- __skb_queue_head(&tp->out_of_order_queue,skb);
+ __skb_queue_head(&tp->out_of_order_queue, skb);
} else {
struct sk_buff *skb1 = tp->out_of_order_queue.prev;
u32 seq = TCP_SKB_CB(skb)->seq;
if (!after(TCP_SKB_CB(skb1)->seq, seq))
break;
} while ((skb1 = skb1->prev) !=
- (struct sk_buff*)&tp->out_of_order_queue);
+ (struct sk_buff *)&tp->out_of_order_queue);
/* Do skb overlap to previous one? */
- if (skb1 != (struct sk_buff*)&tp->out_of_order_queue &&
+ if (skb1 != (struct sk_buff *)&tp->out_of_order_queue &&
before(seq, TCP_SKB_CB(skb1)->end_seq)) {
if (!after(end_seq, TCP_SKB_CB(skb1)->end_seq)) {
/* All the bits are present. Drop. */
}
if (after(seq, TCP_SKB_CB(skb1)->seq)) {
/* Partial overlap. */
- tcp_dsack_set(tp, seq, TCP_SKB_CB(skb1)->end_seq);
+ tcp_dsack_set(tp, seq,
+ TCP_SKB_CB(skb1)->end_seq);
} else {
skb1 = skb1->prev;
}
/* And clean segments covered by new one as whole. */
while ((skb1 = skb->next) !=
- (struct sk_buff*)&tp->out_of_order_queue &&
+ (struct sk_buff *)&tp->out_of_order_queue &&
after(end_seq, TCP_SKB_CB(skb1)->seq)) {
- if (before(end_seq, TCP_SKB_CB(skb1)->end_seq)) {
- tcp_dsack_extend(tp, TCP_SKB_CB(skb1)->seq, end_seq);
- break;
- }
- __skb_unlink(skb1, &tp->out_of_order_queue);
- tcp_dsack_extend(tp, TCP_SKB_CB(skb1)->seq, TCP_SKB_CB(skb1)->end_seq);
- __kfree_skb(skb1);
+ if (before(end_seq, TCP_SKB_CB(skb1)->end_seq)) {
+ tcp_dsack_extend(tp, TCP_SKB_CB(skb1)->seq,
+ end_seq);
+ break;
+ }
+ __skb_unlink(skb1, &tp->out_of_order_queue);
+ tcp_dsack_extend(tp, TCP_SKB_CB(skb1)->seq,
+ TCP_SKB_CB(skb1)->end_seq);
+ __kfree_skb(skb1);
}
add_sack:
/* First, check that queue is collapsible and find
* the point where collapsing can be useful. */
- for (skb = head; skb != tail; ) {
+ for (skb = head; skb != tail;) {
/* No new bits? It is possible on ofo queue. */
if (!before(start, TCP_SKB_CB(skb)->end_seq)) {
struct sk_buff *next = skb->next;
/* Too big header? This can happen with IPv6. */
if (copy < 0)
return;
- if (end-start < copy)
- copy = end-start;
- nskb = alloc_skb(copy+header, GFP_ATOMIC);
+ if (end - start < copy)
+ copy = end - start;
+ nskb = alloc_skb(copy + header, GFP_ATOMIC);
if (!nskb)
return;
tcp_collapse_ofo_queue(sk);
tcp_collapse(sk, &sk->sk_receive_queue,
sk->sk_receive_queue.next,
- (struct sk_buff*)&sk->sk_receive_queue,
+ (struct sk_buff *)&sk->sk_receive_queue,
tp->copied_seq, tp->rcv_nxt);
sk_mem_reclaim(sk);
return -1;
}
-
/* RFC2861, slow part. Adjust cwnd, after it was not full during one rto.
* As additional protections, we do not touch cwnd in retransmission phases,
* and if application hit its sndbuf limit recently.
int sndmem = max_t(u32, tp->rx_opt.mss_clamp, tp->mss_cache) +
MAX_TCP_HEADER + 16 + sizeof(struct sk_buff),
demanded = max_t(unsigned int, tp->snd_cwnd,
- tp->reordering + 1);
- sndmem *= 2*demanded;
+ tp->reordering + 1);
+ sndmem *= 2 * demanded;
if (sndmem > sk->sk_sndbuf)
sk->sk_sndbuf = min(sndmem, sysctl_tcp_wmem[2]);
tp->snd_cwnd_stamp = tcp_time_stamp;
/* We ACK each frame or... */
tcp_in_quickack_mode(sk) ||
/* We have out of order data. */
- (ofo_possible &&
- skb_peek(&tp->out_of_order_queue))) {
+ (ofo_possible && skb_peek(&tp->out_of_order_queue))) {
/* Then ack it now */
tcp_send_ack(sk);
} else {
* either form (or just set the sysctl tcp_stdurg).
*/
-static void tcp_check_urg(struct sock * sk, struct tcphdr * th)
+static void tcp_check_urg(struct sock *sk, struct tcphdr *th)
{
struct tcp_sock *tp = tcp_sk(sk);
u32 ptr = ntohs(th->urg_ptr);
* buggy users.
*/
if (tp->urg_seq == tp->copied_seq && tp->urg_data &&
- !sock_flag(sk, SOCK_URGINLINE) &&
- tp->copied_seq != tp->rcv_nxt) {
+ !sock_flag(sk, SOCK_URGINLINE) && tp->copied_seq != tp->rcv_nxt) {
struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
tp->copied_seq++;
if (skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq)) {
}
}
- tp->urg_data = TCP_URG_NOTYET;
- tp->urg_seq = ptr;
+ tp->urg_data = TCP_URG_NOTYET;
+ tp->urg_seq = ptr;
/* Disable header prediction. */
tp->pred_flags = 0;
/* Check if we get a new urgent pointer - normally not. */
if (th->urg)
- tcp_check_urg(sk,th);
+ tcp_check_urg(sk, th);
/* Do we wait for any urgent data? - normally not... */
if (tp->urg_data == TCP_URG_NOTYET) {
return err;
}
-static __sum16 __tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb)
+static __sum16 __tcp_checksum_complete_user(struct sock *sk,
+ struct sk_buff *skb)
{
__sum16 result;
return result;
}
-static inline int tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb)
+static inline int tcp_checksum_complete_user(struct sock *sk,
+ struct sk_buff *skb)
{
return !skb_csum_unnecessary(skb) &&
- __tcp_checksum_complete_user(sk, skb);
+ __tcp_checksum_complete_user(sk, skb);
}
#ifdef CONFIG_NET_DMA
-static int tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb, int hlen)
+static int tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb,
+ int hlen)
{
struct tcp_sock *tp = tcp_sk(sk);
int chunk = skb->len - hlen;
if (tp->ucopy.dma_chan && skb_csum_unnecessary(skb)) {
dma_cookie = dma_skb_copy_datagram_iovec(tp->ucopy.dma_chan,
- skb, hlen, tp->ucopy.iov, chunk, tp->ucopy.pinned_list);
+ skb, hlen,
+ tp->ucopy.iov, chunk,
+ tp->ucopy.pinned_list);
if (dma_cookie < 0)
goto out;
*/
if ((tcp_flag_word(th) & TCP_HP_BITS) == tp->pred_flags &&
- TCP_SKB_CB(skb)->seq == tp->rcv_nxt) {
+ TCP_SKB_CB(skb)->seq == tp->rcv_nxt) {
int tcp_header_len = tp->tcp_header_len;
/* Timestamp header prediction: tcp_header_len
eaten = 1;
}
#endif
- if (tp->ucopy.task == current && sock_owned_by_user(sk) && !copied_early) {
+ if (tp->ucopy.task == current &&
+ sock_owned_by_user(sk) && !copied_early) {
__set_current_state(TASK_RUNNING);
if (!tcp_copy_to_iovec(sk, skb, tcp_header_len))
NET_INC_STATS_BH(LINUX_MIB_TCPHPHITS);
/* Bulk data transfer: receiver */
- __skb_pull(skb,tcp_header_len);
+ __skb_pull(skb, tcp_header_len);
__skb_queue_tail(&sk->sk_receive_queue, skb);
skb_set_owner_r(skb, sk);
tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
}
slow_path:
- if (len < (th->doff<<2) || tcp_checksum_complete_user(sk, skb))
+ if (len < (th->doff << 2) || tcp_checksum_complete_user(sk, skb))
goto csum_error;
/*
}
/* PAWS check. */
- if (tp->rx_opt.ts_recent_stamp && tp->rx_opt.saw_tstamp && tcp_paws_check(&tp->rx_opt, 0))
+ if (tp->rx_opt.ts_recent_stamp && tp->rx_opt.saw_tstamp &&
+ tcp_paws_check(&tp->rx_opt, 0))
goto discard_and_undo;
if (th->syn) {
tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
tcp_initialize_rcv_mss(sk);
-
tcp_send_synack(sk);
#if 0
/* Note, we could accept data and URG from this segment.
return 1;
}
-
/*
* This function implements the receiving procedure of RFC 793 for
* all states except ESTABLISHED and TIME_WAIT.
*/
if (sk->sk_socket)
sk_wake_async(sk,
- SOCK_WAKE_IO, POLL_OUT);
+ SOCK_WAKE_IO, POLL_OUT);
tp->snd_una = TCP_SKB_CB(skb)->ack_seq;
tp->snd_wnd = ntohs(th->window) <<
* and does not calculate rtt.
* Fix it at least with timestamps.
*/
- if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr &&
- !tp->srtt)
+ if (tp->rx_opt.saw_tstamp &&
+ tp->rx_opt.rcv_tsecr && !tp->srtt)
tcp_ack_saw_tstamp(sk, 0);
if (tp->rx_opt.tstamp_ok)
* following RFC2414. Senders, not following this RFC,
* will be satisfied with 2.
*/
- if (mss > (1<<*rcv_wscale)) {
+ if (mss > (1 << *rcv_wscale)) {
int init_cwnd = 4;
- if (mss > 1460*3)
+ if (mss > 1460 * 3)
init_cwnd = 2;
else if (mss > 1460)
init_cwnd = 3;
- if (*rcv_wnd > init_cwnd*mss)
- *rcv_wnd = init_cwnd*mss;
+ if (*rcv_wnd > init_cwnd * mss)
+ *rcv_wnd = init_cwnd * mss;
}
/* Set the clamp no higher than max representable value */
return new_win;
}
-static inline void TCP_ECN_send_synack(struct tcp_sock *tp,
- struct sk_buff *skb)
+static inline void TCP_ECN_send_synack(struct tcp_sock *tp, struct sk_buff *skb)
{
TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_CWR;
- if (!(tp->ecn_flags&TCP_ECN_OK))
+ if (!(tp->ecn_flags & TCP_ECN_OK))
TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_ECE;
}
tp->ecn_flags = 0;
if (sysctl_tcp_ecn) {
- TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ECE|TCPCB_FLAG_CWR;
+ TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ECE | TCPCB_FLAG_CWR;
tp->ecn_flags = TCP_ECN_OK;
}
}
if (skb->len != tcp_header_len &&
!before(TCP_SKB_CB(skb)->seq, tp->snd_nxt)) {
INET_ECN_xmit(sk);
- if (tp->ecn_flags&TCP_ECN_QUEUE_CWR) {
+ if (tp->ecn_flags & TCP_ECN_QUEUE_CWR) {
tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR;
tcp_hdr(skb)->cwr = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
(TCPOPT_NOP << 16) |
(TCPOPT_MD5SIG << 8) |
TCPOLEN_MD5SIG);
- *md5_hash = (__u8 *) ptr;
+ *md5_hash = (__u8 *)ptr;
}
#endif
}
* We are working here with either a clone of the original
* SKB, or a fresh unique copy made by the retransmit engine.
*/
-static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it, gfp_t gfp_mask)
+static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
+ gfp_t gfp_mask)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct inet_sock *inet;
th->urg_ptr = 0;
if (unlikely(tp->urg_mode &&
- between(tp->snd_up, tcb->seq+1, tcb->seq+0xFFFF))) {
- th->urg_ptr = htons(tp->snd_up-tcb->seq);
+ between(tp->snd_up, tcb->seq + 1, tcb->seq + 0xFFFF))) {
+ th->urg_ptr = htons(tp->snd_up - tcb->seq);
th->urg = 1;
}
#undef SYSCTL_FLAG_SACK
}
-
/* This routine just queue's the buffer
*
* NOTE: probe0 timer is not checked, do not forget tcp_push_pending_frames,
sk_mem_charge(sk, skb->truesize);
}
-static void tcp_set_skb_tso_segs(struct sock *sk, struct sk_buff *skb, unsigned int mss_now)
+static void tcp_set_skb_tso_segs(struct sock *sk, struct sk_buff *skb,
+ unsigned int mss_now)
{
if (skb->len <= mss_now || !sk_can_gso(sk)) {
/* Avoid the costly divide in the normal
* packet to the list. This won't be called frequently, I hope.
* Remember, these are still headerless SKBs at this point.
*/
-int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss_now)
+int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
+ unsigned int mss_now)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *buff;
/* PSH and FIN should only be set in the second packet. */
flags = TCP_SKB_CB(skb)->flags;
- TCP_SKB_CB(skb)->flags = flags & ~(TCPCB_FLAG_FIN|TCPCB_FLAG_PSH);
+ TCP_SKB_CB(skb)->flags = flags & ~(TCPCB_FLAG_FIN | TCPCB_FLAG_PSH);
TCP_SKB_CB(buff)->flags = flags;
TCP_SKB_CB(buff)->sacked = TCP_SKB_CB(skb)->sacked;
if (!skb_shinfo(skb)->nr_frags && skb->ip_summed != CHECKSUM_PARTIAL) {
/* Copy and checksum data tail into the new buffer. */
- buff->csum = csum_partial_copy_nocheck(skb->data + len, skb_put(buff, nsize),
+ buff->csum = csum_partial_copy_nocheck(skb->data + len,
+ skb_put(buff, nsize),
nsize, 0);
skb_trim(skb, len);
eat = len;
k = 0;
- for (i=0; i<skb_shinfo(skb)->nr_frags; i++) {
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
if (skb_shinfo(skb)->frags[i].size <= eat) {
put_page(skb_shinfo(skb)->frags[i].page);
eat -= skb_shinfo(skb)->frags[i].size;
int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len)
{
- if (skb_cloned(skb) &&
- pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+ if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
return -ENOMEM;
/* If len == headlen, we avoid __skb_pull to preserve alignment. */
NOTE2. inet_csk(sk)->icsk_pmtu_cookie and tp->mss_cache
are READ ONLY outside this function. --ANK (980731)
*/
-
unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu)
{
struct tcp_sock *tp = tcp_sk(sk);
mss_now = tcp_mtu_to_mss(sk, pmtu);
/* Bound mss with half of window */
- if (tp->max_window && mss_now > (tp->max_window>>1))
- mss_now = max((tp->max_window>>1), 68U - tp->tcp_header_len);
+ if (tp->max_window && mss_now > (tp->max_window >> 1))
+ mss_now = max((tp->max_window >> 1), 68U - tp->tcp_header_len);
/* And store cached results */
icsk->icsk_pmtu_cookie = pmtu;
inet_csk(sk)->icsk_ext_hdr_len -
tp->tcp_header_len);
- if (tp->max_window &&
- (xmit_size_goal > (tp->max_window >> 1)))
+ if (tp->max_window && (xmit_size_goal > (tp->max_window >> 1)))
xmit_size_goal = max((tp->max_window >> 1),
68U - tp->tcp_header_len);
}
/* Congestion window validation. (RFC2861) */
-
static void tcp_cwnd_validate(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
* per input skb which could be mostly avoided here (if desired).
*/
static unsigned int tcp_mss_split_point(struct sock *sk, struct sk_buff *skb,
- unsigned int mss_now,
- unsigned int cwnd)
+ unsigned int mss_now, unsigned int cwnd)
{
struct tcp_sock *tp = tcp_sk(sk);
u32 needed, window, cwnd_len;
/* Can at least one segment of SKB be sent right now, according to the
* congestion window rules? If so, return how many segments are allowed.
*/
-static inline unsigned int tcp_cwnd_test(struct tcp_sock *tp, struct sk_buff *skb)
+static inline unsigned int tcp_cwnd_test(struct tcp_sock *tp,
+ struct sk_buff *skb)
{
u32 in_flight, cwnd;
/* This must be invoked the first time we consider transmitting
* SKB onto the wire.
*/
-static int tcp_init_tso_segs(struct sock *sk, struct sk_buff *skb, unsigned int mss_now)
+static int tcp_init_tso_segs(struct sock *sk, struct sk_buff *skb,
+ unsigned int mss_now)
{
int tso_segs = tcp_skb_pcount(skb);
- if (!tso_segs ||
- (tso_segs > 1 &&
- tcp_skb_mss(skb) != mss_now)) {
+ if (!tso_segs || (tso_segs > 1 && tcp_skb_mss(skb) != mss_now)) {
tcp_set_skb_tso_segs(sk, skb, mss_now);
tso_segs = tcp_skb_pcount(skb);
}
* 4. Or TCP_CORK is not set, and all sent packets are ACKed.
* With Minshall's modification: all sent small packets are ACKed.
*/
-
static inline int tcp_nagle_check(const struct tcp_sock *tp,
const struct sk_buff *skb,
unsigned mss_now, int nonagle)
{
return (skb->len < mss_now &&
- ((nonagle&TCP_NAGLE_CORK) ||
- (!nonagle &&
- tp->packets_out &&
- tcp_minshall_check(tp))));
+ ((nonagle & TCP_NAGLE_CORK) ||
+ (!nonagle && tp->packets_out && tcp_minshall_check(tp))));
}
/* Return non-zero if the Nagle test allows this packet to be
}
/* Does at least the first segment of SKB fit into the send window? */
-static inline int tcp_snd_wnd_test(struct tcp_sock *tp, struct sk_buff *skb, unsigned int cur_mss)
+static inline int tcp_snd_wnd_test(struct tcp_sock *tp, struct sk_buff *skb,
+ unsigned int cur_mss)
{
u32 end_seq = TCP_SKB_CB(skb)->end_seq;
return 0;
cwnd_quota = tcp_cwnd_test(tp, skb);
- if (cwnd_quota &&
- !tcp_snd_wnd_test(tp, skb, cur_mss))
+ if (cwnd_quota && !tcp_snd_wnd_test(tp, skb, cur_mss))
cwnd_quota = 0;
return cwnd_quota;
* know that all the data is in scatter-gather pages, and that the
* packet has never been sent out before (and thus is not cloned).
*/
-static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len, unsigned int mss_now)
+static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
+ unsigned int mss_now)
{
struct sk_buff *buff;
int nlen = skb->len - len;
/* PSH and FIN should only be set in the second packet. */
flags = TCP_SKB_CB(skb)->flags;
- TCP_SKB_CB(skb)->flags = flags & ~(TCPCB_FLAG_FIN|TCPCB_FLAG_PSH);
+ TCP_SKB_CB(skb)->flags = flags & ~(TCPCB_FLAG_FIN | TCPCB_FLAG_PSH);
TCP_SKB_CB(buff)->flags = flags;
/* This packet was never sent out yet, so no SACK bits. */
in_flight = tcp_packets_in_flight(tp);
- BUG_ON(tcp_skb_pcount(skb) <= 1 ||
- (tp->snd_cwnd <= in_flight));
+ BUG_ON(tcp_skb_pcount(skb) <= 1 || (tp->snd_cwnd <= in_flight));
send_win = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq;
}
/* Ok, it looks like it is advisable to defer. */
- tp->tso_deferred = 1 | (jiffies<<1);
+ tp->tso_deferred = 1 | (jiffies << 1);
return 1;
/* Create a new MTU probe if we are ready.
* Returns 0 if we should wait to probe (no cwnd available),
* 1 if a probe was sent,
- * -1 otherwise */
+ * -1 otherwise
+ */
static int tcp_mtu_probe(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
/* Very simple search strategy: just double the MSS. */
mss_now = tcp_current_mss(sk, 0);
- probe_size = 2*tp->mss_cache;
+ probe_size = 2 * tp->mss_cache;
size_needed = probe_size + (tp->reordering + 1) * tp->mss_cache;
if (probe_size > tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_high)) {
/* TODO: set timer for probe_converge_event */
skb_copy_bits(skb, 0, skb_put(nskb, copy), copy);
else
nskb->csum = skb_copy_and_csum_bits(skb, 0,
- skb_put(nskb, copy), copy, nskb->csum);
+ skb_put(nskb, copy),
+ copy, nskb->csum);
if (skb->len <= copy) {
/* We've eaten all the data from this skb.
if (!skb_shinfo(skb)->nr_frags) {
skb_pull(skb, copy);
if (skb->ip_summed != CHECKSUM_PARTIAL)
- skb->csum = csum_partial(skb->data, skb->len, 0);
+ skb->csum = csum_partial(skb->data,
+ skb->len, 0);
} else {
__pskb_trim_head(skb, copy);
tcp_set_skb_tso_segs(sk, skb, mss_now);
TCP_SKB_CB(nskb)->when = tcp_time_stamp;
if (!tcp_transmit_skb(sk, nskb, 1, GFP_ATOMIC)) {
/* Decrement cwnd here because we are sending
- * effectively two packets. */
+ * effectively two packets. */
tp->snd_cwnd--;
tcp_event_new_data_sent(sk, nskb);
return -1;
}
-
/* This routine writes packets to the network. It advances the
* send_head. This happens as incoming acks open up the remote
* window for us.
icsk->icsk_ack.quick = 0;
if (tcp_memory_pressure)
- tp->rcv_ssthresh = min(tp->rcv_ssthresh, 4U*tp->advmss);
+ tp->rcv_ssthresh = min(tp->rcv_ssthresh,
+ 4U * tp->advmss);
if (free_space < mss)
return 0;
* is too small.
*/
if (window <= free_space - mss || window > free_space)
- window = (free_space/mss)*mss;
+ window = (free_space / mss) * mss;
else if (mss == full_space &&
free_space > window + (full_space >> 1))
window = free_space;
}
/* Attempt to collapse two adjacent SKB's during retransmission. */
-static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int mss_now)
+static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb,
+ int mss_now)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *next_skb = tcp_write_queue_next(sk, skb);
if (skb == tcp_send_head(sk))
break;
if (skb->len > mss &&
- !(TCP_SKB_CB(skb)->sacked&TCPCB_SACKED_ACKED)) {
- if (TCP_SKB_CB(skb)->sacked&TCPCB_SACKED_RETRANS) {
+ !(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) {
+ if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) {
TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
tp->retrans_out -= tcp_skb_pcount(skb);
}
- if (!(TCP_SKB_CB(skb)->sacked&TCPCB_LOST)) {
+ if (!(TCP_SKB_CB(skb)->sacked & TCPCB_LOST)) {
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
tp->lost_out += tcp_skb_pcount(skb);
lost = 1;
(skb->len < (cur_mss >> 1)) &&
(tcp_write_queue_next(sk, skb) != tcp_send_head(sk)) &&
(!tcp_skb_is_last(sk, skb)) &&
- (skb_shinfo(skb)->nr_frags == 0 && skb_shinfo(tcp_write_queue_next(sk, skb))->nr_frags == 0) &&
- (tcp_skb_pcount(skb) == 1 && tcp_skb_pcount(tcp_write_queue_next(sk, skb)) == 1) &&
+ (skb_shinfo(skb)->nr_frags == 0 &&
+ skb_shinfo(tcp_write_queue_next(sk, skb))->nr_frags == 0) &&
+ (tcp_skb_pcount(skb) == 1 &&
+ tcp_skb_pcount(tcp_write_queue_next(sk, skb)) == 1) &&
(sysctl_tcp_retrans_collapse != 0))
tcp_retrans_try_collapse(sk, skb, cur_mss);
tp->total_retrans++;
#if FASTRETRANS_DEBUG > 0
- if (TCP_SKB_CB(skb)->sacked&TCPCB_SACKED_RETRANS) {
+ if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) {
if (net_ratelimit())
printk(KERN_DEBUG "retrans_out leaked.\n");
}
if (tp->retransmit_skb_hint) {
skb = tp->retransmit_skb_hint;
packet_cnt = tp->retransmit_cnt_hint;
- }else{
+ } else {
skb = tcp_write_queue_head(sk);
packet_cnt = 0;
}
return;
if (sacked & TCPCB_LOST) {
- if (!(sacked&(TCPCB_SACKED_ACKED|TCPCB_SACKED_RETRANS))) {
+ if (!(sacked & (TCPCB_SACKED_ACKED|TCPCB_SACKED_RETRANS))) {
if (tcp_retransmit_skb(sk, skb)) {
tp->retransmit_skb_hint = NULL;
return;
}
}
-
/* Send a fin. The caller locks the socket for us. This cannot be
* allowed to fail queueing a FIN frame under any circumstances.
*/
*/
int tcp_send_synack(struct sock *sk)
{
- struct sk_buff* skb;
+ struct sk_buff *skb;
skb = tcp_write_queue_head(sk);
- if (skb == NULL || !(TCP_SKB_CB(skb)->flags&TCPCB_FLAG_SYN)) {
+ if (skb == NULL || !(TCP_SKB_CB(skb)->flags & TCPCB_FLAG_SYN)) {
printk(KERN_DEBUG "tcp_send_synack: wrong queue state\n");
return -EFAULT;
}
- if (!(TCP_SKB_CB(skb)->flags&TCPCB_FLAG_ACK)) {
+ if (!(TCP_SKB_CB(skb)->flags & TCPCB_FLAG_ACK)) {
if (skb_cloned(skb)) {
struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
if (nskb == NULL)
/*
* Prepare a SYN-ACK.
*/
-struct sk_buff * tcp_make_synack(struct sock *sk, struct dst_entry *dst,
- struct request_sock *req)
+struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
+ struct request_sock *req)
{
struct inet_request_sock *ireq = inet_rsk(req);
struct tcp_sock *tp = tcp_sk(sk);
if (ato > TCP_DELACK_MIN) {
const struct tcp_sock *tp = tcp_sk(sk);
- int max_ato = HZ/2;
+ int max_ato = HZ / 2;
- if (icsk->icsk_ack.pingpong || (icsk->icsk_ack.pending & ICSK_ACK_PUSHED))
+ if (icsk->icsk_ack.pingpong ||
+ (icsk->icsk_ack.pending & ICSK_ACK_PUSHED))
max_ato = TCP_DELACK_MAX;
/* Slow path, intersegment interval is "high". */
* directly.
*/
if (tp->srtt) {
- int rtt = max(tp->srtt>>3, TCP_DELACK_MIN);
+ int rtt = max(tp->srtt >> 3, TCP_DELACK_MIN);
if (rtt < max_ato)
max_ato = rtt;
projects / linux-2.6 / commitdiff