/*
- * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
tcp_cc tcp_ccgen;
-#if IPSEC
-extern int ipsec_bypass;
-#endif
-
-extern int32_t total_sbmb_cnt;
-
struct tcpstat tcpstat;
static int log_in_vain = 0;
SYSCTL_NODE(_net_inet_tcp, OID_AUTO, reass, CTLFLAG_RW|CTLFLAG_LOCKED, 0,
"TCP Segment Reassembly Queue");
-__private_extern__ int tcp_reass_maxseg = 0;
-SYSCTL_INT(_net_inet_tcp_reass, OID_AUTO, maxsegments, CTLFLAG_RW | CTLFLAG_LOCKED,
- &tcp_reass_maxseg, 0,
- "Global maximum number of TCP Segments in Reassembly Queue");
-
-__private_extern__ int tcp_reass_qsize = 0;
-SYSCTL_INT(_net_inet_tcp_reass, OID_AUTO, cursegments, CTLFLAG_RD | CTLFLAG_LOCKED,
- &tcp_reass_qsize, 0,
- "Global number of TCP Segments currently in Reassembly Queue");
-
static int tcp_reass_overflows = 0;
SYSCTL_INT(_net_inet_tcp_reass, OID_AUTO, overflows, CTLFLAG_RD | CTLFLAG_LOCKED,
&tcp_reass_overflows, 0,
&tcp_obey_ifef_nowindowscale, 0, "");
#endif
-/* This limit will determine when the receive socket buffer tuning will
- * kick in. Currently it will start when the bw*delay measured in
- * last RTT is more than half of the current hiwat on the buffer.
- */
-uint32_t tcp_rbuf_hiwat_shift = 1;
-
-/* This limit will determine when the socket buffer will be increased
- * to accommodate an application reading slowly. When the amount of
- * space left in the buffer is less than one forth of the bw*delay
- * measured in last RTT.
- */
-uint32_t tcp_rbuf_win_shift = 2;
-
extern int tcp_TCPTV_MIN;
extern int tcp_acc_iaj_high;
extern int tcp_acc_iaj_react_limit;
static inline void tcp_adaptive_rwtimo_check(struct tcpcb *, int);
#if TRAFFIC_MGT
-static inline void update_iaj_state(struct tcpcb *tp, uint32_t tlen, int reset_size);
+static inline void update_iaj_state(struct tcpcb *tp, uint32_t tlen,
+ int reset_size);
void compute_iaj(struct tcpcb *tp, int nlropkts, int lro_delay_factor);
static void compute_iaj_meat(struct tcpcb *tp, uint32_t cur_iaj);
#endif /* TRAFFIC_MGT */
static inline void tcp_sbrcv_reserve(struct tcpcb *tp, struct sockbuf *sb,
u_int32_t newsize, u_int32_t idealsize);
static void tcp_bad_rexmt_restore_state(struct tcpcb *tp, struct tcphdr *th);
-static int tcp_detect_bad_rexmt(struct tcpcb *tp, struct tcpopt *to);
static void tcp_compute_rtt(struct tcpcb *tp, struct tcpopt *to,
struct tcphdr *th);
-
+static void tcp_early_rexmt_check(struct tcpcb *tp, struct tcphdr *th);
+static void tcp_bad_rexmt_check(struct tcpcb *tp, struct tcphdr *th,
+ struct tcpopt *to);
/*
* Constants used for resizing receive socket buffer
* when timestamps are not supported
#define TCP_EARLY_REXMT_WIN (60 * TCP_RETRANSHZ) /* 60 seconds */
#define TCP_EARLY_REXMT_LIMIT 10
-extern void add_to_time_wait(struct tcpcb *, uint32_t delay);
-extern void postevent(struct socket *, struct sockbuf *, int);
-
extern void ipfwsyslog( int level, const char *format,...);
extern int fw_verbose;
static void tcp_newreno_partial_ack(struct tcpcb *tp, struct tcphdr *th);
static void update_base_rtt(struct tcpcb *tp, uint32_t rtt);
-uint32_t get_base_rtt(struct tcpcb *tp);
void tcp_set_background_cc(struct socket *so);
void tcp_set_foreground_cc(struct socket *so);
static void tcp_set_new_cc(struct socket *so, uint16_t cc_index);
int dowakeup = 0;
struct mbuf *oodata = NULL;
int copy_oodata = 0;
+ u_int16_t qlimit;
boolean_t cell = IFNET_IS_CELLULAR(ifp);
boolean_t wifi = (!cell && IFNET_IS_WIFI(ifp));
+ boolean_t wired = (!wifi && IFNET_IS_WIRED(ifp));
/*
* Call with th==0 after become established to
if (th == NULL)
goto present;
- /* If the reassembly queue already has entries or if we are going to add
- * a new one, then the connection has reached a loss state.
+ /*
+ * If the reassembly queue already has entries or if we are going
+ * to add a new one, then the connection has reached a loss state.
* Reset the stretch-ack algorithm at this point.
*/
- if ((tp->t_flags & TF_STRETCHACK) != 0)
- tcp_reset_stretch_ack(tp);
-
- /* When the connection reaches a loss state, we need to send more acks
- * for a period of time so that the sender's congestion window will
- * open. Wait until we see some packets on the connection before
- * stretching acks again.
- */
- tp->t_flagsext |= TF_RCVUNACK_WAITSS;
- tp->rcv_waitforss = 0;
-
+ tcp_reset_stretch_ack(tp);
#if TRAFFIC_MGT
if (tp->acc_iaj > 0)
* queue. Always keep one global queue entry spare to be able to
* process the missing segment.
*/
+ qlimit = min(max(100, so->so_rcv.sb_hiwat >> 10),
+ tcp_autorcvbuf_max >> 10);
if (th->th_seq != tp->rcv_nxt &&
- tcp_reass_qsize + 1 >= tcp_reass_maxseg) {
+ (tp->t_reassqlen + 1) >= qlimit) {
tcp_reass_overflows++;
tcpstat.tcps_rcvmemdrop++;
m_freem(m);
}
/* Allocate a new queue entry. If we can't, just drop the pkt. XXX */
- te = (struct tseg_qent *) zalloc_noblock(tcp_reass_zone);
+ te = (struct tseg_qent *) zalloc(tcp_reass_zone);
if (te == NULL) {
tcpstat.tcps_rcvmemdrop++;
m_freem(m);
return (0);
}
- tcp_reass_qsize++;
+ tp->t_reassqlen++;
/*
* Find a segment which begins after this one does.
tcpstat.tcps_rcvduppack++;
tcpstat.tcps_rcvdupbyte += *tlenp;
if (nstat_collect) {
- nstat_route_rx(inp->inp_route.ro_rt, 1, *tlenp, NSTAT_RX_FLAG_DUPLICATE);
- INP_ADD_STAT(inp, cell, wifi, rxpackets, 1);
- INP_ADD_STAT(inp, cell, wifi, rxbytes, *tlenp);
+ nstat_route_rx(inp->inp_route.ro_rt,
+ 1, *tlenp,
+ NSTAT_RX_FLAG_DUPLICATE);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxpackets, 1);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxbytes, *tlenp);
tp->t_stat.rxduplicatebytes += *tlenp;
}
m_freem(m);
zfree(tcp_reass_zone, te);
te = NULL;
- tcp_reass_qsize--;
+ tp->t_reassqlen--;
/*
* Try to present any queued data
* at the left window edge to the user.
tcpstat.tcps_rcvoopack++;
tcpstat.tcps_rcvoobyte += *tlenp;
if (nstat_collect) {
- nstat_route_rx(inp->inp_route.ro_rt, 1, *tlenp, NSTAT_RX_FLAG_OUT_OF_ORDER);
- INP_ADD_STAT(inp, cell, wifi, rxpackets, 1);
- INP_ADD_STAT(inp, cell, wifi, rxbytes, *tlenp);
+ nstat_route_rx(inp->inp_route.ro_rt, 1, *tlenp,
+ NSTAT_RX_FLAG_OUT_OF_ORDER);
+ INP_ADD_STAT(inp, cell, wifi, wired, rxpackets, 1);
+ INP_ADD_STAT(inp, cell, wifi, wired, rxbytes, *tlenp);
tp->t_stat.rxoutoforderbytes += *tlenp;
}
LIST_REMOVE(q, tqe_q);
m_freem(q->tqe_m);
zfree(tcp_reass_zone, q);
- tcp_reass_qsize--;
+ tp->t_reassqlen--;
q = nq;
}
goto msg_unordered_delivery;
return (0);
- }
+ }
+
+ /* lost packet was recovered, so ooo data can be returned */
+ tcpstat.tcps_recovered_pkts++;
+
do {
tp->rcv_nxt += q->tqe_len;
flags = q->tqe_th->th_flags & TH_FIN;
}
}
zfree(tcp_reass_zone, q);
- tcp_reass_qsize--;
+ tp->t_reassqlen--;
q = nq;
} while (q && q->tqe_th->th_seq == tp->rcv_nxt);
ENTER_FASTRECOVERY(tp);
tp->snd_recover = tp->snd_max;
tp->t_timer[TCPT_REXMT] = 0;
+ tp->t_timer[TCPT_PTO] = 0;
tp->t_rtttime = 0;
- tp->ecn_flags |= TE_SENDCWR;
tp->snd_cwnd = tp->snd_ssthresh +
tp->t_maxseg * tcprexmtthresh;
}
if ((total_sbmb_cnt < mblim) &&
(sb->sb_hiwat < sbspacelim)) {
return(1);
+ } else {
+ OSIncrementAtomic64(&sbmb_limreached);
}
return(0);
}
/*
* Do not grow the receive socket buffer if
* - auto resizing is disabled, globally or on this socket
- * - the high water mark has already reached the maximum
+ * - the high water mark already reached the maximum
* - the stream is in background and receive side is being
* throttled
* - if there are segments in reassembly queue indicating loss,
* do not need to increase recv window during recovery as more
- * data is not going to be sent.
+ * data is not going to be sent. A duplicate ack sent during
+ * recovery should not change the receive window
*/
if (tcp_do_autorcvbuf == 0 ||
(sbrcv->sb_flags & SB_AUTOSIZE) == 0 ||
* Timestamp option is not supported on this connection.
* If the connection reached a state to indicate that
* the receive socket buffer needs to grow, increase
- * the high water mark.
- */
+ * the high water mark.
+ */
if (TSTMP_GEQ(tcp_now,
tp->rfbuf_ts + TCPTV_RCVNOTS_QUANTUM)) {
if (tp->rfbuf_cnt >= TCP_RCVNOTS_BYTELEVEL) {
} else {
tp->rfbuf_cnt += pktlen;
return;
- }
+ }
} else if (to->to_tsecr != 0) {
- /* If the timestamp shows that one RTT has
+ /*
+ * If the timestamp shows that one RTT has
* completed, we can stop counting the
* bytes. Here we consider increasing
- * the socket buffer if it fits the following
- * criteria:
- * 1. the bandwidth measured in last rtt, is more
- * than half of sb_hiwat, this will help to scale the
- * buffer according to the bandwidth on the link.
- * 2. the space left in sbrcv is less than
- * one forth of the bandwidth measured in last rtt, this
- * will help to accommodate an application reading slowly.
+ * the socket buffer if the bandwidth measured in
+ * last rtt, is more than half of sb_hiwat, this will
+ * help to scale the buffer according to the bandwidth
+ * on the link.
*/
if (TSTMP_GEQ(to->to_tsecr, tp->rfbuf_ts)) {
- if ((tp->rfbuf_cnt > (sbrcv->sb_hiwat -
- (sbrcv->sb_hiwat >> tcp_rbuf_hiwat_shift)) ||
- (sbrcv->sb_hiwat - sbrcv->sb_cc) <
- (tp->rfbuf_cnt >> tcp_rbuf_win_shift))) {
- u_int32_t rcvbuf_inc;
+ if (tp->rfbuf_cnt > (sbrcv->sb_hiwat -
+ (sbrcv->sb_hiwat >> 1))) {
+ int32_t rcvbuf_inc, min_incr;
/*
- * Increment the receive window by a multiple of
- * maximum sized segments. This will prevent a
- * connection from sending smaller segments on
- * wire if it is limited by the receive window.
+ * Increment the receive window by a
+ * multiple of maximum sized segments.
+ * This will prevent a connection from
+ * sending smaller segments on wire if it
+ * is limited by the receive window.
*
- * Set the ideal size based on current bandwidth
- * measurements. We set the ideal size on receive
- * socket buffer to be twice the bandwidth delay
- * product.
+ * Set the ideal size based on current
+ * bandwidth measurements. We set the
+ * ideal size on receive socket buffer to
+ * be twice the bandwidth delay product.
*/
- rcvbuf_inc = tp->t_maxseg << tcp_autorcvbuf_inc_shift;
+ rcvbuf_inc = (tp->rfbuf_cnt << 1)
+ - sbrcv->sb_hiwat;
+
+ /*
+ * Make the increment equal to 8 segments
+ * at least
+ */
+ min_incr = tp->t_maxseg << tcp_autorcvbuf_inc_shift;
+ if (rcvbuf_inc < min_incr)
+ rcvbuf_inc = min_incr;
+
+ rcvbuf_inc =
+ (rcvbuf_inc / tp->t_maxseg) * tp->t_maxseg;
tcp_sbrcv_reserve(tp, sbrcv,
sbrcv->sb_hiwat + rcvbuf_inc,
(tp->rfbuf_cnt * 2));
static inline int
tcp_stretch_ack_enable(struct tcpcb *tp)
{
- if (!(tp->t_flagsext & TF_NOSTRETCHACK) &&
+ if (!(tp->t_flagsext & (TF_NOSTRETCHACK|TF_DISABLE_STRETCHACK)) &&
tp->rcv_by_unackwin >= (maxseg_unacked * tp->t_maxseg) &&
TSTMP_GT(tp->rcv_unackwin + tcp_maxrcvidle, tcp_now) &&
(!(tp->t_flagsext & TF_RCVUNACK_WAITSS) ||
return(0);
}
-/* Reset the state related to stretch-ack algorithm. This will make
+/*
+ * Reset the state related to stretch-ack algorithm. This will make
* the receiver generate an ack every other packet. The receiver
* will start re-evaluating the rate at which packets come to decide
* if it can benefit by lowering the ack traffic.
tp->t_flags &= ~(TF_STRETCHACK);
tp->rcv_by_unackwin = 0;
tp->rcv_unackwin = tcp_now + tcp_rcvunackwin;
+
+ /*
+ * When there is packet loss or packet re-ordering or CWR due to
+ * ECN, the sender's congestion window is reduced. In these states,
+ * generate an ack for every other packet for some time to allow
+ * the sender's congestion window to grow.
+ */
+ tp->t_flagsext |= TF_RCVUNACK_WAITSS;
+ tp->rcv_waitforss = 0;
}
/*
* This function will return 1 if it is a spurious retransmit,
* 0 otherwise.
*/
-static int
-tcp_detect_bad_rexmt(struct tcpcb *tp, struct tcpopt *to)
+int
+tcp_detect_bad_rexmt(struct tcpcb *tp, struct tcphdr *th,
+ struct tcpopt *to, u_int32_t rxtime)
{
int32_t tdiff, bad_rexmt_win;
- tdiff = (int32_t)(tcp_now - tp->t_rxtstart);
bad_rexmt_win = (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
- if (TSTMP_SUPPORTED(tp) && tp->t_rxtstart > 0 &&
- (to->to_flags & TOF_TS) != 0 &&
- to->to_tsecr != 0 &&
- TSTMP_LT(to->to_tsecr, tp->t_rxtstart)) {
- return (1);
- } else if (tp->t_rxtshift == 1 &&
- tdiff < bad_rexmt_win) {
- return(1);
+ /* If the ack has ECN CE bit, then cwnd has to be adjusted */
+ if ((tp->ecn_flags & (TE_ECN_ON)) == (TE_ECN_ON)
+ && (th->th_flags & TH_ECE))
+ return (0);
+ if (TSTMP_SUPPORTED(tp)) {
+ if (rxtime > 0 && (to->to_flags & TOF_TS)
+ && to->to_tsecr != 0
+ && TSTMP_LT(to->to_tsecr, rxtime))
+ return (1);
+ } else {
+ if ((tp->t_rxtshift == 1
+ || (tp->t_flagsext & TF_SENT_TLPROBE))
+ && rxtime > 0) {
+ tdiff = (int32_t)(tcp_now - rxtime);
+ if (tdiff < bad_rexmt_win)
+ return(1);
+ }
}
return(0);
}
if (tp->t_flags & TF_WASFRECOVERY)
ENTER_FASTRECOVERY(tp);
}
+ tp->snd_cwnd = max(tp->snd_cwnd, TCP_CC_CWND_INIT_BYTES);
tp->snd_recover = tp->snd_recover_prev;
tp->snd_nxt = tp->snd_max;
tp->t_rxtshift = 0;
tp->t_rtttime = 0;
}
+/*
+ * If the previous packet was sent in retransmission timer, and it was
+ * not needed, then restore the congestion window to the state before that
+ * transmission.
+ *
+ * If the last packet was sent in tail loss probe timeout, check if that
+ * recovered the last packet. If so, that will indicate a real loss and
+ * the congestion window needs to be lowered.
+ */
+static void
+tcp_bad_rexmt_check(struct tcpcb *tp, struct tcphdr *th, struct tcpopt *to)
+{
+ if (tp->t_rxtshift > 0 &&
+ tcp_detect_bad_rexmt(tp, th, to, tp->t_rxtstart)) {
+ ++tcpstat.tcps_sndrexmitbad;
+ tcp_bad_rexmt_restore_state(tp, th);
+ tcp_ccdbg_trace(tp, th, TCP_CC_BAD_REXMT_RECOVERY);
+ } else if ((tp->t_flagsext & TF_SENT_TLPROBE)
+ && tp->t_tlphighrxt > 0
+ && SEQ_GEQ(th->th_ack, tp->t_tlphighrxt)
+ && !tcp_detect_bad_rexmt(tp, th, to, tp->t_tlpstart)) {
+ /*
+ * The tail loss probe recovered the last packet and
+ * we need to adjust the congestion window to take
+ * this loss into account.
+ */
+ ++tcpstat.tcps_tlp_recoverlastpkt;
+ if (!IN_FASTRECOVERY(tp)) {
+ tcp_reduce_congestion_window(tp);
+ EXIT_FASTRECOVERY(tp);
+ }
+ tcp_ccdbg_trace(tp, th, TCP_CC_TLP_RECOVER_LASTPACKET);
+ }
+
+ tp->t_flagsext &= ~(TF_SENT_TLPROBE);
+ tp->t_tlphighrxt = 0;
+ tp->t_tlpstart = 0;
+
+ /*
+ * check if the latest ack was for a segment sent during PMTU
+ * blackhole detection. If the timestamp on the ack is before
+ * PMTU blackhole detection, then revert the size of the max
+ * segment to previous size.
+ */
+ if (tp->t_rxtshift > 0 && (tp->t_flags & TF_BLACKHOLE) &&
+ tp->t_pmtud_start_ts > 0 && TSTMP_SUPPORTED(tp)) {
+ if ((to->to_flags & TOF_TS) && to->to_tsecr != 0
+ && TSTMP_LT(to->to_tsecr, tp->t_pmtud_start_ts)) {
+ tcp_pmtud_revert_segment_size(tp);
+ }
+ }
+ if (tp->t_pmtud_start_ts > 0)
+ tp->t_pmtud_start_ts = 0;
+}
+
+/*
+ * Check if early retransmit can be attempted according to RFC 5827.
+ *
+ * If packet reordering is detected on a connection, fast recovery will
+ * be delayed until it is clear that the packet was lost and not reordered.
+ * But reordering detection is done only when SACK is enabled.
+ *
+ * On connections that do not support SACK, there is a limit on the number
+ * of early retransmits that can be done per minute. This limit is needed
+ * to make sure that too many packets are not retransmitted when there is
+ * packet reordering.
+ */
+static void
+tcp_early_rexmt_check (struct tcpcb *tp, struct tcphdr *th)
+{
+ u_int32_t obytes, snd_off;
+ int32_t snd_len;
+ struct socket *so = tp->t_inpcb->inp_socket;
+
+ if (early_rexmt && (SACK_ENABLED(tp) ||
+ tp->t_early_rexmt_count < TCP_EARLY_REXMT_LIMIT) &&
+ SEQ_GT(tp->snd_max, tp->snd_una) &&
+ (tp->t_dupacks == 1 ||
+ (SACK_ENABLED(tp) &&
+ !TAILQ_EMPTY(&tp->snd_holes)))) {
+ /*
+ * If there are only a few outstanding
+ * segments on the connection, we might need
+ * to lower the retransmit threshold. This
+ * will allow us to do Early Retransmit as
+ * described in RFC 5827.
+ */
+ if (SACK_ENABLED(tp) &&
+ !TAILQ_EMPTY(&tp->snd_holes)) {
+ obytes = (tp->snd_max - tp->snd_fack) +
+ tp->sackhint.sack_bytes_rexmit;
+ } else {
+ obytes = (tp->snd_max - tp->snd_una);
+ }
+
+ /*
+ * In order to lower retransmit threshold the
+ * following two conditions must be met.
+ * 1. the amount of outstanding data is less
+ * than 4*SMSS bytes
+ * 2. there is no unsent data ready for
+ * transmission or the advertised window
+ * will limit sending new segments.
+ */
+ snd_off = tp->snd_max - tp->snd_una;
+ snd_len = min(so->so_snd.sb_cc, tp->snd_wnd) - snd_off;
+ if (obytes < (tp->t_maxseg << 2) &&
+ snd_len <= 0) {
+ u_int32_t osegs;
+
+ osegs = obytes / tp->t_maxseg;
+ if ((osegs * tp->t_maxseg) < obytes)
+ osegs++;
+
+ /*
+ * Since the connection might have already
+ * received some dupacks, we add them to
+ * to the outstanding segments count to get
+ * the correct retransmit threshold.
+ *
+ * By checking for early retransmit after
+ * receiving some duplicate acks when SACK
+ * is supported, the connection will
+ * enter fast recovery even if multiple
+ * segments are lost in the same window.
+ */
+ osegs += tp->t_dupacks;
+ if (osegs < 4) {
+ tp->t_rexmtthresh =
+ ((osegs - 1) > 1) ? (osegs - 1) : 1;
+ tp->t_rexmtthresh =
+ min(tp->t_rexmtthresh, tcprexmtthresh);
+ tp->t_rexmtthresh =
+ max(tp->t_rexmtthresh, tp->t_dupacks);
+
+ if (tp->t_early_rexmt_count == 0)
+ tp->t_early_rexmt_win = tcp_now;
+
+ if (tp->t_flagsext & TF_SENT_TLPROBE) {
+ tcpstat.tcps_tlp_recovery++;
+ tcp_ccdbg_trace(tp, th,
+ TCP_CC_TLP_RECOVERY);
+ } else {
+ tcpstat.tcps_early_rexmt++;
+ tp->t_early_rexmt_count++;
+ tcp_ccdbg_trace(tp, th,
+ TCP_CC_EARLY_RETRANSMIT);
+ }
+ }
+ }
+ }
+
+ /*
+ * If we ever sent a TLP probe, the acknowledgement will trigger
+ * early retransmit because the value of snd_fack will be close
+ * to snd_max. This will take care of adjustments to the
+ * congestion window. So we can reset TF_SENT_PROBE flag.
+ */
+ tp->t_flagsext &= ~(TF_SENT_TLPROBE);
+ tp->t_tlphighrxt = 0;
+ tp->t_tlpstart = 0;
+}
+
void
tcp_input(m, off0)
struct mbuf *m;
#endif
struct m_tag *fwd_tag;
u_char ip_ecn = IPTOS_ECN_NOTECT;
- unsigned int ifscope, nocell = 0;
+ unsigned int ifscope;
uint8_t isconnected, isdisconnected;
struct ifnet *ifp = m->m_pkthdr.rcvif;
int pktf_sw_lro_pkt = (m->m_pkthdr.pkt_flags & PKTF_SW_LRO_PKT) ? 1 : 0;
#endif /* MPTCP */
boolean_t cell = IFNET_IS_CELLULAR(ifp);
boolean_t wifi = (!cell && IFNET_IS_WIFI(ifp));
+ boolean_t wired = (!wifi && IFNET_IS_WIRED(ifp));
+ struct tcp_respond_args tra;
#define TCP_INC_VAR(stat, npkts) do { \
stat += npkts; \
*/
if (inp != NULL && (inp->inp_flags & INP_BOUND_IF))
ifscope = inp->inp_boundifp->if_index;
-
- /*
- * If the PCB is present and the socket isn't allowed to use
- * the cellular interface, indicate it as such for tcp_respond.
- */
- if (inp != NULL && (inp->inp_flags & INP_NO_IFT_CELLULAR))
- nocell = 1;
-
-#if IPSEC
- if (ipsec_bypass == 0) {
+#if NECP
+ if (inp != NULL && (
#if INET6
- if (isipv6) {
- if (inp != NULL && ipsec6_in_reject_so(m, inp->inp_socket)) {
- IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio);
- if (in_pcb_checkstate(inp, WNT_RELEASE, 0) == WNT_STOPUSING)
- inp = NULL; // pretend we didn't find it
-
- IF_TCP_STATINC(ifp, badformatipsec);
-
- goto dropnosock;
- }
- } else
-#endif /* INET6 */
- if (inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) {
- IPSEC_STAT_INCREMENT(ipsecstat.in_polvio);
- if (in_pcb_checkstate(inp, WNT_RELEASE, 0) == WNT_STOPUSING)
- inp = NULL; // pretend we didn't find it
-
- IF_TCP_STATINC(ifp, badformatipsec);
-
- goto dropnosock;
- }
+ isipv6 ? !necp_socket_is_allowed_to_send_recv_v6(inp,
+ th->th_dport, th->th_sport, &ip6->ip6_dst,
+ &ip6->ip6_src, ifp, NULL) :
+#endif
+ !necp_socket_is_allowed_to_send_recv_v4(inp, th->th_dport,
+ th->th_sport, &ip->ip_dst, &ip->ip_src,
+ ifp, NULL))) {
+ if (in_pcb_checkstate(inp, WNT_RELEASE, 0)
+ == WNT_STOPUSING) {
+ inp = NULL; /* pretend we didn't find it */
+ }
+ IF_TCP_STATINC(ifp, badformatipsec);
+ goto dropnosock;
}
-#endif /*IPSEC*/
+#endif /* NECP */
/*
* If the state is CLOSED (i.e., TCB does not exist) then
struct inpcb *oinp = sotoinpcb(so);
#endif /* INET6 */
struct ifnet *head_ifscope;
- unsigned int head_nocell, head_recvanyif;
+ unsigned int head_nocell, head_recvanyif,
+ head_noexpensive, head_awdl_unrestricted;
/* Get listener's bound-to-interface, if any */
head_ifscope = (inp->inp_flags & INP_BOUND_IF) ?
inp->inp_boundifp : NULL;
/* Get listener's no-cellular information, if any */
- head_nocell = (inp->inp_flags & INP_NO_IFT_CELLULAR) ? 1 : 0;
+ head_nocell = INP_NO_CELLULAR(inp);
/* Get listener's recv-any-interface, if any */
head_recvanyif = (inp->inp_flags & INP_RECV_ANYIF);
+ /* Get listener's no-expensive information, if any */
+ head_noexpensive = INP_NO_EXPENSIVE(inp);
+ head_awdl_unrestricted = INP_AWDL_UNRESTRICTED(inp);
/*
* If the state is LISTEN then ignore segment if it contains an RST.
inp->inp_flags &= ~INP_BOUND_IF;
}
/*
- * Inherit INP_NO_IFT_CELLULAR from listener.
+ * Inherit restrictions from listener.
*/
- if (head_nocell) {
- inp->inp_flags |= INP_NO_IFT_CELLULAR;
- }
+ if (head_nocell)
+ inp_set_nocellular(inp);
+ if (head_noexpensive)
+ inp_set_noexpensive(inp);
+ if (head_awdl_unrestricted)
+ inp_set_awdl_unrestricted(inp);
/*
* Inherit {IN,IN6}_RECV_ANYIF from listener.
*/
struct tcpcb *, tp, int32_t, TCPS_LISTEN);
tp->t_state = TCPS_LISTEN;
tp->t_flags |= tp0->t_flags & (TF_NOPUSH|TF_NOOPT|TF_NODELAY);
- tp->t_flagsext |= (tp0->t_flagsext & TF_RXTFINDROP);
+ tp->t_flagsext |= (tp0->t_flagsext & (TF_RXTFINDROP|TF_NOTIMEWAIT));
tp->t_keepinit = tp0->t_keepinit;
tp->t_keepcnt = tp0->t_keepcnt;
tp->t_keepintvl = tp0->t_keepintvl;
KERNEL_DEBUG(DBG_FNC_TCP_NEWCONN | DBG_FUNC_END,0,0,0,0,0);
}
}
- lck_mtx_assert(&((struct inpcb *)so->so_pcb)->inpcb_mtx, LCK_MTX_ASSERT_OWNED);
+ lck_mtx_assert(&((struct inpcb *)so->so_pcb)->inpcb_mtx,
+ LCK_MTX_ASSERT_OWNED);
if (tp->t_state == TCPS_ESTABLISHED && tlen > 0) {
/*
/*
* If we received an explicit notification of congestion in
* ip tos ecn bits or by the CWR bit in TCP header flags, reset
- * the ack-strteching state.
+ * the ack-strteching state. We need to handle ECN notification if
+ * an ECN setup SYN was sent even once.
*/
- if (tp->t_state == TCPS_ESTABLISHED &&
- (ip_ecn == IPTOS_ECN_CE ||
- (thflags & TH_CWR)))
+ if (tp->t_state == TCPS_ESTABLISHED
+ && (tp->ecn_flags & TE_SETUPSENT)
+ && (ip_ecn == IPTOS_ECN_CE || (thflags & TH_CWR)))
tcp_reset_stretch_ack(tp);
/*
SEQ_LEQ(th->th_ack, tp->snd_max) &&
tp->snd_cwnd >= tp->snd_ssthresh &&
(!IN_FASTRECOVERY(tp) &&
- ((!(SACK_ENABLED(tp)) && tp->t_dupacks < tp->t_rexmtthresh) ||
- (SACK_ENABLED(tp) && to.to_nsacks == 0 &&
- TAILQ_EMPTY(&tp->snd_holes))))) {
+ ((!(SACK_ENABLED(tp)) &&
+ tp->t_dupacks < tp->t_rexmtthresh) ||
+ (SACK_ENABLED(tp) && to.to_nsacks == 0 &&
+ TAILQ_EMPTY(&tp->snd_holes))))) {
/*
* this is a pure ack for outstanding data.
*/
++tcpstat.tcps_predack;
- /*
- * "bad retransmit" recovery
- */
- if (tp->t_rxtshift > 0 &&
- tcp_detect_bad_rexmt(tp, &to)) {
- ++tcpstat.tcps_sndrexmitbad;
- tcp_bad_rexmt_restore_state(tp, th);
-
- DTRACE_TCP5(cc, void, NULL,
- struct inpcb *, tp->t_inpcb,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_BAD_REXMT_RECOVERY);
- }
+ tcp_bad_rexmt_check(tp, th, &to),
/* Recalculate the RTT */
tcp_compute_rtt(tp, &to, th);
* avoidance phase. The calculations in this function
* assume that snd_una is not updated yet.
*/
- if (CC_ALGO(tp)->inseq_ack_rcvd != NULL)
- CC_ALGO(tp)->inseq_ack_rcvd(tp, th);
-
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_INSEQ_ACK_RCVD);
-
+ if (CC_ALGO(tp)->congestion_avd != NULL)
+ CC_ALGO(tp)->congestion_avd(tp, th);
+ tcp_ccdbg_trace(tp, th, TCP_CC_INSEQ_ACK_RCVD);
sbdrop(&so->so_snd, acked);
if (so->so_flags & SOF_ENABLE_MSGS) {
VERIFY(acked <= so->so_msg_state->msg_serial_bytes);
* are ready to send, let tcp_output
* decide between more output or persist.
*/
- if (tp->snd_una == tp->snd_max)
+ if (tp->snd_una == tp->snd_max) {
tp->t_timer[TCPT_REXMT] = 0;
- else if (tp->t_timer[TCPT_PERSIST] == 0)
- tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp, tp->t_rxtcur);
+ tp->t_timer[TCPT_PTO] = 0;
+ } else if (tp->t_timer[TCPT_PERSIST] == 0) {
+ tp->t_timer[TCPT_REXMT] =
+ OFFSET_FROM_START(tp,
+ tp->t_rxtcur);
+ }
if ((tp->t_flagsext & TF_MEASURESNDBW) != 0 &&
tp->t_bwmeas != NULL)
tcpstat.tcps_rcvbyte += tlen;
if (nstat_collect) {
if (m->m_pkthdr.pkt_flags & PKTF_SW_LRO_PKT) {
- INP_ADD_STAT(inp, cell, wifi, rxpackets,
- m->m_pkthdr.lro_npkts);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxpackets, m->m_pkthdr.lro_npkts);
} else {
- INP_ADD_STAT(inp, cell, wifi, rxpackets, 1);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxpackets, 1);
}
- INP_ADD_STAT(inp, cell, wifi, rxbytes, tlen);
+ INP_ADD_STAT(inp, cell, wifi, wired,rxbytes,
+ tlen);
}
/*
* Receive window is amount of space in rcv queue,
* but not less than advertised window.
*/
- lck_mtx_assert(&((struct inpcb *)so->so_pcb)->inpcb_mtx, LCK_MTX_ASSERT_OWNED);
+ lck_mtx_assert(&((struct inpcb *)so->so_pcb)->inpcb_mtx,
+ LCK_MTX_ASSERT_OWNED);
win = tcp_sbspace(tp);
if (win < 0)
win = 0;
register struct sockaddr_in6 *sin6;
#endif
- lck_mtx_assert(&((struct inpcb *)so->so_pcb)->inpcb_mtx, LCK_MTX_ASSERT_OWNED);
+ lck_mtx_assert(&((struct inpcb *)so->so_pcb)->inpcb_mtx,
+ LCK_MTX_ASSERT_OWNED);
#if INET6
if (isipv6) {
MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6,
}
if (thflags & TH_RST) {
if ((thflags & TH_ACK) != 0) {
+#if MPTCP
+ if ((so->so_flags & SOF_MPTCP_FASTJOIN) &&
+ SEQ_GT(th->th_ack, tp->iss+1)) {
+ so->so_flags &= ~SOF_MPTCP_FASTJOIN;
+ /* ignore the RST and retransmit SYN */
+ goto drop;
+ }
+#endif /* MPTCP */
soevent(so,
(SO_FILT_HINT_LOCKED |
SO_FILT_HINT_CONNRESET));
if ((thflags & (TH_ECE | TH_CWR)) == (TH_ECE)) {
/* ECN-setup SYN-ACK */
tp->ecn_flags |= TE_SETUPRECEIVED;
+ tcpstat.tcps_ecn_setup++;
}
else {
/* non-ECN-setup SYN-ACK */
if ((!(tp->t_mpflags & TMPF_MPTCP_TRUE)) &&
(tp->t_mpflags & TMPF_SENT_JOIN)) {
isconnected = FALSE;
+ /* Start data xmit if fastjoin */
+ if (mptcp_fastjoin && (so->so_flags & SOF_MPTCP_FASTJOIN)) {
+ soevent(so, (SO_FILT_HINT_LOCKED |
+ SO_FILT_HINT_MPFASTJ));
+ }
} else
#endif /* MPTCP */
isconnected = TRUE;
if (nstat_collect) {
nstat_route_rx(tp->t_inpcb->inp_route.ro_rt,
1, tlen, NSTAT_RX_FLAG_DUPLICATE);
- INP_ADD_STAT(inp, cell, wifi, rxpackets, 1);
- INP_ADD_STAT(inp, cell, wifi, rxbytes, tlen);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxpackets, 1);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxbytes, tlen);
tp->t_stat.rxduplicatebytes += tlen;
}
if (tlen)
if (nstat_collect) {
nstat_route_rx(tp->t_inpcb->inp_route.ro_rt, 1,
todrop, NSTAT_RX_FLAG_DUPLICATE);
- INP_ADD_STAT(inp, cell, wifi, rxpackets, 1);
- INP_ADD_STAT(inp, cell, wifi, rxbytes, todrop);
+ INP_ADD_STAT(inp, cell, wifi, wired, rxpackets, 1);
+ INP_ADD_STAT(inp, cell, wifi, wired, rxbytes, todrop);
tp->t_stat.rxduplicatebytes += todrop;
}
drop_hdrlen += todrop; /* drop from the top afterwards */
}
if (SACK_ENABLED(tp) &&
(to.to_nsacks > 0 || !TAILQ_EMPTY(&tp->snd_holes)))
- tcp_sack_doack(tp, &to, th->th_ack, &sack_bytes_acked);
+ tcp_sack_doack(tp, &to, th, &sack_bytes_acked);
+
#if MPTCP
if ((tp->t_mpuna) && (SEQ_GEQ(th->th_ack, tp->t_mpuna))) {
-#if 0
- if ((tp->t_mpflags & TMPF_MPTCP_TRUE) &&
- !(tp->t_mpflags & TMPF_MPTCP_READY)) {
- printf("%s: fallback? %x %x \n", __func__,
- th->th_ack, tp->t_mpuna);
- tp->t_mpuna = 0;
- }
-#endif
if (tp->t_mpflags & TMPF_PREESTABLISHED) {
/* MP TCP establishment succeeded */
tp->t_mpuna = 0;
so->so_flags |= SOF_MPTCP_TRUE;
if (mptcp_dbg >= MP_ERR_DEBUG)
printf("MPTCP SUCCESS"
- "%s \n",__func__);
+ " %s \n",__func__);
tp->t_timer[TCPT_JACK_RXMT] = 0;
tp->t_mprxtshift = 0;
isconnected = TRUE;
} else {
isconnected = TRUE;
tp->t_mpflags &= ~TMPF_SENT_KEYS;
-
}
}
}
*/
if (SEQ_LEQ(th->th_ack, tp->snd_una)) {
if (tlen == 0 && tiwin == tp->snd_wnd) {
+ /*
+ * If both ends send FIN at the same time,
+ * then the ack will be a duplicate ack
+ * but we have to process the FIN. Check
+ * for this condition and process the FIN
+ * instead of the dupack
+ */
+ if ((thflags & TH_FIN) &&
+ (tp->t_flags & TF_SENTFIN) &&
+ !TCPS_HAVERCVDFIN(tp->t_state) &&
+ (th->th_ack + 1) == tp->snd_max) {
+ break;
+ }
process_dupack:
#if MPTCP
/*
if (to.to_flags & TOF_MPTCP) {
goto drop;
}
+
+ if ((isconnected) && (tp->t_mpflags & TMPF_JOINED_FLOW)) {
+ if (mptcp_dbg >= MP_ERR_DEBUG)
+ printf("%s: bypass ack recovery\n",__func__);
+ break;
+ }
#endif /* MPTCP */
+ /*
+ * If a duplicate acknowledgement was seen
+ * after ECN, it indicates packet loss in
+ * addition to ECN. Reset INRECOVERY flag
+ * so that we can process partial acks
+ * correctly
+ */
+ if (tp->ecn_flags & TE_INRECOVERY)
+ tp->ecn_flags &= ~TE_INRECOVERY;
+
tcpstat.tcps_rcvdupack++;
++tp->t_dupacks;
- /*
- * Check if we need to reset the limit on early
- * retransmit
+
+ /*
+ * Check if we need to reset the limit on
+ * early retransmit
*/
- if (TSTMP_GEQ(tcp_now,
- (tp->t_early_rexmt_win + TCP_EARLY_REXMT_WIN)))
+ if (tp->t_early_rexmt_count > 0 &&
+ TSTMP_GEQ(tcp_now,
+ (tp->t_early_rexmt_win +
+ TCP_EARLY_REXMT_WIN)))
tp->t_early_rexmt_count = 0;
/*
* Is early retransmit needed? We check for
* this when the connection is waiting for
- * more duplicate acks to enter fast recovery.
+ * duplicate acks to enter fast recovery.
*/
- if (early_rexmt &&
- tp->t_early_rexmt_count < TCP_EARLY_REXMT_LIMIT &&
- !IN_FASTRECOVERY(tp) &&
- SEQ_GT(tp->snd_max, tp->snd_una) &&
- (tp->t_dupacks == 1 ||
- (SACK_ENABLED(tp) &&
- !TAILQ_EMPTY(&tp->snd_holes)))) {
- /*
- * If there are only a few outstanding
- * segments on the connection, we might need
- * to lower the retransmit threshold. This
- * will allow us to do Early Retransmit as
- * described in RFC 5827.
- */
- u_int32_t obytes, snd_off;
- int32_t snd_len;
- if (SACK_ENABLED(tp) &&
- !TAILQ_EMPTY(&tp->snd_holes)) {
- obytes = (tp->snd_max - tp->snd_fack) +
- tp->sackhint.sack_bytes_rexmit;
- } else {
- obytes = (tp->snd_max - tp->snd_una);
- }
+ if (!IN_FASTRECOVERY(tp))
+ tcp_early_rexmt_check(tp, th);
- /* In order to lower retransmit threshold the
- * following two conditions must be met.
- * 1. the amount of outstanding data is less
- * than 4*SMSS bytes
- * 2. there is no unsent data ready for
- * transmission or the advertised window
- * will limit sending new segments.
- */
- snd_off = tp->snd_max - tp->snd_una;
- snd_len = min(so->so_snd.sb_cc, tp->snd_wnd) - snd_off;
- if (obytes < (tp->t_maxseg << 2) &&
- snd_len <= 0) {
- u_int32_t osegs;
-
-
- osegs = obytes / tp->t_maxseg;
- if ((osegs * tp->t_maxseg) < obytes)
- osegs++;
-
- /*
- * Since the connection might have already
- * received some dupacks, we add them to
- * to the outstanding segments count to get
- * the correct retransmit threshold.
- *
- * By checking for early retransmit after
- * receiving some duplicate acks when SACK
- * is supported, the connection will be able
- * to enter fast recovery even if multiple
- * segments are lost in the same window.
- */
- osegs += tp->t_dupacks;
- if (osegs < 4) {
- tcpstat.tcps_early_rexmt++;
- tp->t_rexmtthresh = ((osegs - 1) > 1) ?
- (osegs - 1) : 1;
- tp->t_rexmtthresh = min(tp->t_rexmtthresh,
- tcprexmtthresh);
- tp->t_rexmtthresh = max(tp->t_rexmtthresh,
- tp->t_dupacks);
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_EARLY_RETRANSMIT);
- if (tp->t_early_rexmt_count == 0)
- tp->t_early_rexmt_win = tcp_now;
- tp->t_early_rexmt_count++;
- }
- }
- }
/*
- * If we've seen exactly our rexmt threshold
+ * If we've seen exactly rexmt threshold
* of duplicate acks, assume a packet
* has been dropped and retransmit it.
* Kludge snd_nxt & the congestion
* network.
*/
if (tp->t_timer[TCPT_REXMT] == 0 ||
- (th->th_ack != tp->snd_una && sack_bytes_acked == 0)) {
+ (th->th_ack != tp->snd_una
+ && sack_bytes_acked == 0)) {
tp->t_dupacks = 0;
tp->t_rexmtthresh = tcprexmtthresh;
} else if (tp->t_dupacks > tp->t_rexmtthresh ||
- IN_FASTRECOVERY(tp)) {
- if (SACK_ENABLED(tp) && IN_FASTRECOVERY(tp)) {
+ IN_FASTRECOVERY(tp)) {
+
+ /*
+ * If this connection was seeing packet
+ * reordering, then recovery might be
+ * delayed to disambiguate between
+ * reordering and loss
+ */
+ if (SACK_ENABLED(tp) && !IN_FASTRECOVERY(tp) &&
+ (tp->t_flagsext &
+ (TF_PKTS_REORDERED|TF_DELAY_RECOVERY)) ==
+ (TF_PKTS_REORDERED|TF_DELAY_RECOVERY)) {
+ /*
+ * Since the SACK information is already
+ * updated, this ACK will be dropped
+ */
+ break;
+ }
+
+ if (SACK_ENABLED(tp)
+ && IN_FASTRECOVERY(tp)) {
int awnd;
/*
} else
tp->snd_cwnd += tp->t_maxseg;
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_IN_FASTRECOVERY);
+ tcp_ccdbg_trace(tp, th, TCP_CC_IN_FASTRECOVERY);
(void) tcp_output(tp);
goto drop;
if (IN_FASTRECOVERY(tp)) {
tp->t_dupacks = 0;
break;
+ } else if (tp->t_flagsext & TF_DELAY_RECOVERY) {
+ break;
}
} else {
if (SEQ_LEQ(th->th_ack,
}
}
+ tp->snd_recover = tp->snd_max;
+ tp->t_timer[TCPT_PTO] = 0;
+ tp->t_rtttime = 0;
+
+ /*
+ * If the connection has seen pkt
+ * reordering, delay recovery until
+ * it is clear that the packet
+ * was lost.
+ */
+ if (SACK_ENABLED(tp) &&
+ (tp->t_flagsext &
+ (TF_PKTS_REORDERED|TF_DELAY_RECOVERY))
+ == TF_PKTS_REORDERED &&
+ !IN_FASTRECOVERY(tp) &&
+ tp->t_reorderwin > 0 &&
+ tp->t_state == TCPS_ESTABLISHED) {
+ tp->t_timer[TCPT_DELAYFR] =
+ OFFSET_FROM_START(tp,
+ tp->t_reorderwin);
+ tp->t_flagsext |= TF_DELAY_RECOVERY;
+ tcpstat.tcps_delay_recovery++;
+ tcp_ccdbg_trace(tp, th,
+ TCP_CC_DELAY_FASTRECOVERY);
+ break;
+ }
+
/*
* If the current tcp cc module has
* defined a hook for tasks to run
if (CC_ALGO(tp)->pre_fr != NULL)
CC_ALGO(tp)->pre_fr(tp);
ENTER_FASTRECOVERY(tp);
- tp->snd_recover = tp->snd_max;
tp->t_timer[TCPT_REXMT] = 0;
- tp->t_rtttime = 0;
- if ((tp->ecn_flags & TE_ECN_ON) == TE_ECN_ON) {
+ if ((tp->ecn_flags & TE_ECN_ON)
+ == TE_ECN_ON)
tp->ecn_flags |= TE_SENDCWR;
- }
+
if (SACK_ENABLED(tp)) {
tcpstat.tcps_sack_recovery_episode++;
tp->sack_newdata = tp->snd_nxt;
tp->snd_cwnd = tp->t_maxseg;
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_ENTER_FASTRECOVERY);
+ /*
+ * Enable probe timeout to detect
+ * a tail loss in the recovery
+ * window.
+ */
+ tp->t_timer[TCPT_PTO] =
+ OFFSET_FROM_START(tp,
+ max(10, (tp->t_srtt >> TCP_RTT_SHIFT)));
+
+ tcp_ccdbg_trace(tp, th,
+ TCP_CC_ENTER_FASTRECOVERY);
(void) tcp_output(tp);
goto drop;
tp->t_maxseg * tp->t_dupacks;
if (SEQ_GT(onxt, tp->snd_nxt))
tp->snd_nxt = onxt;
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_ENTER_FASTRECOVERY);
+ tcp_ccdbg_trace(tp, th,
+ TCP_CC_ENTER_FASTRECOVERY);
goto drop;
} else if (limited_txmt &&
ALLOW_LIMITED_TRANSMIT(tp) &&
tcpstat.tcps_limited_txt++;
(void) tcp_output(tp);
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_LIMITED_TRANSMIT);
+ tcp_ccdbg_trace(tp, th, TCP_CC_LIMITED_TRANSMIT);
/* Reset snd_cwnd back to normal */
tp->snd_cwnd -= incr;
*/
if (IN_FASTRECOVERY(tp)) {
if (SEQ_LT(th->th_ack, tp->snd_recover)) {
+ /*
+ * If we received an ECE and entered
+ * recovery, the subsequent ACKs should
+ * not be treated as partial acks.
+ */
+ if (tp->ecn_flags & TE_INRECOVERY)
+ goto process_ACK;
+
if (SACK_ENABLED(tp))
tcp_sack_partialack(tp, th);
else
tcp_newreno_partial_ack(tp, th);
-
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_PARTIAL_ACK);
+ tcp_ccdbg_trace(tp, th, TCP_CC_PARTIAL_ACK);
} else {
EXIT_FASTRECOVERY(tp);
if (CC_ALGO(tp)->post_fr != NULL)
CC_ALGO(tp)->post_fr(tp, th);
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_EXIT_FASTRECOVERY);
+
+ tcp_ccdbg_trace(tp, th,
+ TCP_CC_EXIT_FASTRECOVERY);
+ }
+ } else if ((tp->t_flagsext &
+ (TF_PKTS_REORDERED|TF_DELAY_RECOVERY))
+ == (TF_PKTS_REORDERED|TF_DELAY_RECOVERY)) {
+ /*
+ * If the ack acknowledges upto snd_recover or if
+ * it acknowledges all the snd holes, exit
+ * recovery and cancel the timer. Otherwise,
+ * this is a partial ack. Wait for recovery timer
+ * to enter recovery. The snd_holes have already
+ * been updated.
+ */
+ if (SEQ_GEQ(th->th_ack, tp->snd_recover) ||
+ TAILQ_EMPTY(&tp->snd_holes)) {
+ tp->t_timer[TCPT_DELAYFR] = 0;
+ tp->t_flagsext &= ~TF_DELAY_RECOVERY;
+ EXIT_FASTRECOVERY(tp);
+ tcp_ccdbg_trace(tp, th,
+ TCP_CC_EXIT_FASTRECOVERY);
}
} else {
/*
- * We were not in fast recovery. Reset the duplicate ack
- * counter.
+ * We were not in fast recovery. Reset the
+ * duplicate ack counter.
*/
tp->t_dupacks = 0;
tp->t_rexmtthresh = tcprexmtthresh;
* If the last packet was a retransmit, make sure
* it was not spurious.
*
- * If the ack has ECE bit set, skip bad
- * retransmit recovery.
+ * This will also take care of congestion window
+ * adjustment if a last packet was recovered due to a
+ * tail loss probe.
*/
- if (tp->t_rxtshift > 0 &&
- (thflags & TH_ECE) == 0 &&
- tcp_detect_bad_rexmt(tp, &to)) {
- ++tcpstat.tcps_sndrexmitbad;
- tcp_bad_rexmt_restore_state(tp, th);
-
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_BAD_REXMT_RECOVERY);
- }
+ tcp_bad_rexmt_check(tp, th, &to);
/* Recalculate the RTT */
tcp_compute_rtt(tp, &to, th);
*/
if (th->th_ack == tp->snd_max) {
tp->t_timer[TCPT_REXMT] = 0;
+ tp->t_timer[TCPT_PTO] = 0;
needoutput = 1;
} else if (tp->t_timer[TCPT_PERSIST] == 0)
- tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp, tp->t_rxtcur);
+ tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp,
+ tp->t_rxtcur);
/*
- * If no data (only SYN) was ACK'd,
- * skip rest of ACK processing.
+ * If no data (only SYN) was ACK'd, skip rest of ACK
+ * processing.
*/
if (acked == 0)
goto step6;
+
if ((thflags & TH_ECE) != 0 &&
((tp->ecn_flags & TE_ECN_ON) == TE_ECN_ON)) {
/*
- * Reduce the congestion window if we haven't done so.
+ * Reduce the congestion window if we haven't
+ * done so.
*/
- if (!SACK_ENABLED(tp) && !IN_FASTRECOVERY(tp) &&
- SEQ_GEQ(th->th_ack, tp->snd_recover)) {
+ if (!IN_FASTRECOVERY(tp)) {
tcp_reduce_congestion_window(tp);
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_ECN_RCVD);
+ tp->ecn_flags |= (TE_INRECOVERY|TE_SENDCWR);
+ tcp_ccdbg_trace(tp, th, TCP_CC_ECN_RCVD);
}
}
if (!IN_FASTRECOVERY(tp)) {
if (CC_ALGO(tp)->ack_rcvd != NULL)
CC_ALGO(tp)->ack_rcvd(tp, th);
-
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, th,
- int32_t, TCP_CC_ACK_RCVD);
+ tcp_ccdbg_trace(tp, th, TCP_CC_ACK_RCVD);
}
if (acked > so->so_snd.sb_cc) {
tp->snd_wnd -= so->so_snd.sb_cc;
int32_t, TCPS_TIME_WAIT);
tp->t_state = TCPS_TIME_WAIT;
tcp_canceltimers(tp);
- add_to_time_wait(tp, 2 * tcp_msl);
+ if (tp->t_flagsext & TF_NOTIMEWAIT) {
+ tp->t_flags |= TF_CLOSING;
+ } else {
+ add_to_time_wait(tp, 2 * tcp_msl);
+ }
isconnected = FALSE;
isdisconnected = TRUE;
}
* ack is ok.
*/
if (sack_ackadv == 1 &&
- tp->t_state == TCPS_ESTABLISHED &&
- SACK_ENABLED(tp) &&
- sack_bytes_acked > 0 &&
- tp->t_dupacks == 0 &&
- SEQ_LEQ(th->th_ack, tp->snd_una) && tlen == 0) {
+ tp->t_state == TCPS_ESTABLISHED &&
+ SACK_ENABLED(tp) && sack_bytes_acked > 0 &&
+ to.to_nsacks > 0 && tp->t_dupacks == 0 &&
+ SEQ_LEQ(th->th_ack, tp->snd_una) && tlen == 0 &&
+ !(tp->t_flagsext & TF_PKTS_REORDERED)) {
tcpstat.tcps_sack_ackadv++;
goto process_dupack;
}
tcpstat.tcps_rcvbyte += tlen;
if (nstat_collect) {
if (m->m_pkthdr.pkt_flags & PKTF_SW_LRO_PKT) {
- INP_ADD_STAT(inp, cell, wifi, rxpackets,
- m->m_pkthdr.lro_npkts);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxpackets, m->m_pkthdr.lro_npkts);
} else {
- INP_ADD_STAT(inp, cell, wifi, rxpackets, 1);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxpackets, 1);
}
- INP_ADD_STAT(inp, cell, wifi, rxbytes, tlen);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ rxbytes, tlen);
}
tcp_sbrcv_grow(tp, &so->so_rcv, &to, tlen);
so_recv_data_stat(so, m, drop_hdrlen);
int32_t, TCPS_TIME_WAIT);
tp->t_state = TCPS_TIME_WAIT;
tcp_canceltimers(tp);
- if (tp->cc_recv != 0 &&
- ((int)(tcp_now - tp->t_starttime)) < tcp_msl) {
- /* For transaction client, force ACK now. */
- tp->t_flags |= TF_ACKNOW;
- tp->t_unacksegs = 0;
+ tp->t_flags |= TF_ACKNOW;
+ if (tp->t_flagsext & TF_NOTIMEWAIT) {
+ tp->t_flags |= TF_CLOSING;
+ } else {
+ add_to_time_wait(tp, 2 * tcp_msl);
}
- add_to_time_wait(tp, 2 * tcp_msl);
soisdisconnected(so);
break;
tcp_trace(TA_DROP, ostate, tp, (void *)tcp_saveipgen,
&tcp_savetcp, 0);
#endif
+ bzero(&tra, sizeof(tra));
+ tra.ifscope = ifscope;
+ tra.awdl_unrestricted = 1;
if (thflags & TH_ACK)
/* mtod() below is safe as long as hdr dropping is delayed */
tcp_respond(tp, mtod(m, void *), th, m, (tcp_seq)0, th->th_ack,
- TH_RST, ifscope, nocell);
+ TH_RST, &tra);
else {
if (thflags & TH_SYN)
tlen++;
/* mtod() below is safe as long as hdr dropping is delayed */
tcp_respond(tp, mtod(m, void *), th, m, th->th_seq+tlen,
- (tcp_seq)0, TH_RST|TH_ACK, ifscope, nocell);
+ (tcp_seq)0, TH_RST|TH_ACK, &tra);
}
/* destroy temporarily created socket */
if (dropsocket) {
TSTMP_GEQ(tcp_now, to->to_tsecr)) {
tcp_xmit_timer(tp, tcp_now - to->to_tsecr,
to->to_tsecr, th->th_ack);
- } else if (tp->t_rtttime && SEQ_GT(th->th_ack, tp->t_rtseq)) {
+ } else if (tp->t_rtttime != 0 && SEQ_GT(th->th_ack, tp->t_rtseq)) {
tcp_xmit_timer(tp, tcp_now - tp->t_rtttime, 0,
th->th_ack);
}
* size (usually 512 or the default IP max size, but no more than the mtu
* of the interface), as we can't discover anything about intervening
* gateways or networks. We also initialize the congestion/slow start
- * window to be a single segment if the destination isn't local.
- * While looking at the routing entry, we also initialize other path-dependent
- * parameters from pre-set or cached values in the routing entry.
+ * window. While looking at the routing entry, we also initialize
+ * other path-dependent parameters from pre-set or cached values
+ * in the routing entry.
*
* Also take into account the space needed for options that we
* send regularly. Make maxseg shorter by that amount to assure
ifp = rt->rt_ifp;
/*
* Slower link window correction:
- * If a value is specificied for slowlink_wsize use it for PPP links
- * believed to be on a serial modem (speed <128Kbps). Excludes 9600bps as
- * it is the default value adversized by pseudo-devices over ppp.
+ * If a value is specificied for slowlink_wsize use it for
+ * PPP links believed to be on a serial modem (speed <128Kbps).
+ * Excludes 9600bps as it is the default value adversized
+ * by pseudo-devices over ppp.
*/
if (ifp->if_type == IFT_PPP && slowlink_wsize > 0 &&
ifp->if_baudrate > 9600 && ifp->if_baudrate <= 128000) {
/*
* There's some sort of gateway or interface
* buffer limit on the path. Use this to set
- * the slow start threshhold, but set the
- * threshold to no less than 2*mss.
+ * slow-start threshold, but set the threshold to
+ * no less than 2*mss.
*/
tp->snd_ssthresh = max(2 * mss, rt->rt_rmx.rmx_ssthresh);
tcpstat.tcps_usedssthresh++;
tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
}
-
/*
* Set the slow-start flight size depending on whether this
* is a local network or not.
if (CC_ALGO(tp)->cwnd_init != NULL)
CC_ALGO(tp)->cwnd_init(tp);
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, tp->t_inpcb, struct tcpcb *, tp,
- struct tcphdr *, NULL, int32_t, TCP_CC_CWND_INIT);
+ tcp_ccdbg_trace(tp, NULL, TCP_CC_CWND_INIT);
/* Route locked during lookup above */
RT_UNLOCK(rt);
tcp_seq onxt = tp->snd_nxt;
u_int32_t ocwnd = tp->snd_cwnd;
tp->t_timer[TCPT_REXMT] = 0;
+ tp->t_timer[TCPT_PTO] = 0;
tp->t_rtttime = 0;
tp->snd_nxt = th->th_ack;
/*
void
tcp_set_foreground_cc(struct socket *so)
{
- tcp_set_new_cc(so, TCP_CC_ALGO_NEWRENO_INDEX);
+ if (tcp_use_newreno)
+ tcp_set_new_cc(so, TCP_CC_ALGO_NEWRENO_INDEX);
+ else
+ tcp_set_new_cc(so, TCP_CC_ALGO_CUBIC_INDEX);
}
static void
CC_ALGO(tp)->cleanup(tp);
tp->tcp_cc_index = cc_index;
- /* Decide if the connection is just starting or if
- * we have sent some packets on it.
- */
- if (tp->snd_nxt > tp->iss) {
- /* Already sent some packets */
- if (CC_ALGO(tp)->switch_to != NULL)
- CC_ALGO(tp)->switch_to(tp, old_cc_index);
- } else {
- if (CC_ALGO(tp)->init != NULL)
- CC_ALGO(tp)->init(tp);
- }
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, struct tcphdr *, NULL,
- int32_t, TCP_CC_CHANGE_ALGO);
+ tcp_cc_allocate_state(tp);
+
+ if (CC_ALGO(tp)->switch_to != NULL)
+ CC_ALGO(tp)->switch_to(tp, old_cc_index);
+
+ tcp_ccdbg_trace(tp, NULL, TCP_CC_CHANGE_ALGO);
}
}
return (0);
}
-SYSCTL_PROC(_net_inet_tcp, TCPCTL_STATS, stats, CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0,
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_STATS, stats,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0,
tcp_getstat, "S,tcpstat", "TCP statistics (struct tcpstat, netinet/tcp_var.h)");
static int
projects / apple / xnu.git / blobdiff