/* * Copyright (c) 2000-2020 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1982, 1986, 1993, 1994, 1995 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 * $FreeBSD: src/sys/netinet/tcp_var.h,v 1.56.2.8 2001/08/22 00:59:13 silby Exp $ */ #ifndef _NETINET_TCP_VAR_H_ #define _NETINET_TCP_VAR_H_ #include <sys/types.h> #include <sys/appleapiopts.h> #include <sys/queue.h> #include <netinet/in_pcb.h> #include <netinet/tcp.h> #include <netinet/tcp_timer.h> #if !KERNEL #include <TargetConditionals.h> #endif #if defined(__LP64__) #define _TCPCB_PTR(x) u_int32_t #define _TCPCB_LIST_HEAD(name, type) \ struct name { \ u_int32_t lh_first; \ } #else #define _TCPCB_PTR(x) x #define _TCPCB_LIST_HEAD(name, type) LIST_HEAD(name, type) #endif #ifdef KERNEL_PRIVATE #define TCP_RETRANSHZ 1000 /* granularity of TCP timestamps, 1ms */ /* Minimum time quantum within which the timers are coalesced */ #define TCP_TIMER_10MS_QUANTUM (TCP_RETRANSHZ/100) /* every 10ms */ #define TCP_TIMER_100MS_QUANTUM (TCP_RETRANSHZ/10) /* every 100ms */ #define TCP_TIMER_500MS_QUANTUM (TCP_RETRANSHZ/2) /* every 500ms */ #define TCP_RETRANSHZ_TO_USEC 1000 #define N_TIME_WAIT_SLOTS 128 /* must be power of 2 */ /* Always allow at least 16 packets worth of recv window when adjusting * recv window using inter-packet arrival jitter. */ #define MIN_IAJ_WIN 16 /* A variation in delay of this many milliseconds is tolerable. This limit has to * be low but greater than zero. We also use standard deviation on jitter to adjust * this limit for different link and connection types. */ #define ALLOWED_IAJ 5 /* Ignore the first few packets on a connection until the ACK clock gets going */ #define IAJ_IGNORE_PKTCNT 40 /* Let the accumulated IAJ value increase by this threshold at most. This limit * will control how many ALLOWED_IAJ measurements a receiver will have to see * before opening the receive window */ #define ACC_IAJ_HIGH_THRESH 100 /* When accumulated IAJ reaches this value, the receiver starts to react by * closing the window */ #define ACC_IAJ_REACT_LIMIT 200 /* If the number of small packets (smaller than IAJ packet size) seen on a * connection is more than this threshold, reset the size and learn it again. * This is needed because the sender might send smaller segments after PMTU * discovery and the receiver has to learn the new size. */ #define RESET_IAJ_SIZE_THRESH 20 /* * Adaptive timeout is a read/write timeout specified by the application to * get a socket event when the transport layer detects a stall in data * transfer. The value specified is the number of probes that can be sent * to the peer before generating an event. Since it is not specified as * a time value, the timeout will adjust based on the RTT seen on the link. * The timeout will start only when there is an indication that the read/write * operation is not making progress. * * If a write operation stalls, the probe will be retransmission of data. * If a read operation stalls, the probe will be a keep-alive packet. * * The maximum value of adaptive timeout is set to 10 which will allow * transmission of enough number of probes to the peer. */ #define TCP_ADAPTIVE_TIMEOUT_MAX 10 #define TCP_CONNECTIVITY_PROBES_MAX 5 /* * Kernel variables for tcp. */ /* TCP segment queue entry */ struct tseg_qent { LIST_ENTRY(tseg_qent) tqe_q; int tqe_len; /* TCP segment data length */ struct tcphdr *tqe_th; /* a pointer to tcp header */ struct mbuf *tqe_m; /* mbuf contains packet */ }; LIST_HEAD(tsegqe_head, tseg_qent); struct sackblk { tcp_seq start; /* start seq no. of sack block */ tcp_seq end; /* end seq no. */ }; struct sackhole { tcp_seq start; /* start seq no. of hole */ tcp_seq end; /* end seq no. */ tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ u_int32_t rxmit_start; /* timestamp of first retransmission */ TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ }; struct sackhint { struct sackhole *nexthole; int sack_bytes_rexmit; int sack_bytes_acked; }; struct tcp_rxt_seg { tcp_seq rx_start; tcp_seq rx_end; u_int16_t rx_count; u_int16_t rx_flags; #define TCP_RXT_SPURIOUS 0x1 /* received DSACK notification */ #define TCP_RXT_DSACK_FOR_TLP 0x2 SLIST_ENTRY(tcp_rxt_seg) rx_link; }; struct tcp_notify_ack_marker { tcp_seq notify_snd_una; /* Notify when snd_una crosses this seq */ tcp_notify_ack_id_t notify_id; SLIST_ENTRY(tcp_notify_ack_marker) notify_next; }; struct tcptemp { u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ struct tcphdr tt_t; }; struct bwmeas { tcp_seq bw_start; /* start of bw measurement */ uint32_t bw_ts; /* timestamp when bw measurement started */ uint32_t bw_size; /* burst size in bytes for this bw measurement */ uint32_t bw_minsizepkts; /* Min burst size as segments */ uint32_t bw_maxsizepkts; /* Max burst size as segments */ uint32_t bw_minsize; /* Min size in bytes */ uint32_t bw_maxsize; /* Max size in bytes */ uint32_t bw_sndbw; /* Measured send bandwidth */ uint32_t bw_sndbw_max; /* Max measured bandwidth */ uint32_t bw_rcvbw_max; /* Max receive bandwidth measured */ }; /* MPTCP Data sequence map entry */ struct mpt_dsn_map { uint64_t mpt_dsn; /* data seq num recvd */ uint32_t mpt_sseq; /* relative subflow # */ uint16_t mpt_len; /* length of mapping */ uint16_t mpt_csum; /* checksum value if on */ uint8_t mpt_dfin; /* It's a DATA_FIN */ }; #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ struct tcp_ccstate { union { struct tcp_cubic_state { u_int32_t tc_last_max; /* cwnd at last loss */ u_int32_t tc_epoch_start; /* TS of last loss */ u_int32_t tc_origin_point; /* window at the start of an epoch */ u_int32_t tc_tcp_win; /* computed tcp win */ u_int32_t tc_tcp_bytes_acked; /* bytes acked */ u_int32_t tc_avg_lastmax; /* Average of last max */ u_int32_t tc_mean_deviation; /* Mean absolute deviation */ float tc_epoch_period; /* K parameter */ } _cubic_state_; #define cub_last_max __u__._cubic_state_.tc_last_max #define cub_epoch_start __u__._cubic_state_.tc_epoch_start #define cub_origin_point __u__._cubic_state_.tc_origin_point #define cub_tcp_win __u__._cubic_state_.tc_tcp_win #define cub_tcp_bytes_acked __u__._cubic_state_.tc_tcp_bytes_acked #define cub_epoch_period __u__._cubic_state_.tc_epoch_period #define cub_avg_lastmax __u__._cubic_state_.tc_avg_lastmax #define cub_mean_dev __u__._cubic_state_.tc_mean_deviation } __u__; }; /* * Tcp control block, one per tcp; fields: * Organized for 16 byte cacheline efficiency. */ struct tcpcb { struct tsegqe_head t_segq; int t_dupacks; /* consecutive dup acks recd */ int t_state; /* state of this connection */ uint32_t t_timer[TCPT_NTIMERS]; /* tcp timers */ struct tcptimerentry tentry; /* entry in timer list */ struct inpcb *t_inpcb; /* back pointer to internet pcb */ uint32_t t_flags; #define TF_ACKNOW 0x00001 /* ack peer immediately */ #define TF_DELACK 0x00002 /* ack, but try to delay it */ #define TF_NODELAY 0x00004 /* don't delay packets to coalesce */ #define TF_NOOPT 0x00008 /* don't use tcp options */ #define TF_SENTFIN 0x00010 /* have sent FIN */ #define TF_REQ_SCALE 0x00020 /* have/will request window scaling */ #define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */ #define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */ #define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */ #define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */ #define TF_NEEDSYN 0x00400 /* send SYN (implicit state) - unused but needed for backwards compatibility */ #define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */ #define TF_NOPUSH 0x01000 /* don't push */ #define TF_REQ_CC 0x02000 /* have/will request CC */ #define TF_RCVD_CC 0x04000 /* a CC was received in SYN */ #define TF_SENDCCNEW 0x08000 /* Unused */ #define TF_MORETOCOME 0x10000 /* More data to be appended to sock */ #define TF_LOCAL 0x20000 /* connection to a host on local link */ #define TF_RXWIN0SENT 0x40000 /* sent a receiver win 0 in response */ #define TF_SLOWLINK 0x80000 /* route is a on a modem speed link */ #define TF_LASTIDLE 0x100000 /* connection was previously idle */ #define TF_FASTRECOVERY 0x200000 /* in NewReno Fast Recovery */ #define TF_WASFRECOVERY 0x400000 /* was in NewReno Fast Recovery */ #define TF_SIGNATURE 0x800000 /* require MD5 digests (RFC2385) */ #define TF_MAXSEGSNT 0x1000000 /* last segment sent was a full segment */ #define TF_STREAMING_ON 0x2000000 /* Receiver detected streaming */ #define TF_PMTUD 0x4000000 /* Perform Path MTU Discovery for this connection */ #define TF_CLOSING 0x8000000 /* pending tcp close */ #define TF_TSO 0x10000000 /* TCP Segment Offloading is enable on this connection */ #define TF_BLACKHOLE 0x20000000 /* Path MTU Discovery Black Hole detection */ #define TF_TIMER_ONLIST 0x40000000 /* pcb is on tcp_timer_list */ #define TF_STRETCHACK 0x80000000 /* receiver is going to delay acks */ tcp_seq snd_una; /* send unacknowledged */ tcp_seq snd_max; /* highest sequence number sent; * used to recognize retransmits */ tcp_seq snd_nxt; /* send next */ tcp_seq snd_up; /* send urgent pointer */ tcp_seq snd_wl1; /* window update seg seq number */ tcp_seq snd_wl2; /* window update seg ack number */ tcp_seq iss; /* initial send sequence number */ tcp_seq irs; /* initial receive sequence number */ tcp_seq rcv_nxt; /* receive next */ tcp_seq rcv_adv; /* advertised window */ uint32_t rcv_wnd; /* receive window */ uint32_t t_last_recwin; tcp_seq rcv_up; /* receive urgent pointer */ uint32_t snd_wnd; /* send window */ uint32_t snd_cwnd; /* congestion-controlled window */ uint32_t snd_ssthresh; /* snd_cwnd size threshold for * for slow start exponential to * linear switch */ tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ uint32_t t_maxopd; /* mss plus options */ uint32_t t_rcvtime; /* time at which a packet was received */ uint32_t t_sndtime; /* time at which we last sent new data */ uint32_t t_starttime; /* time connection was established */ int t_rtttime; /* tcp clock when rtt calculation was started */ tcp_seq t_rtseq; /* sequence number being timed */ uint32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ uint32_t rfbuf_cnt; /* recv buffer autoscaling byte count */ uint32_t rfbuf_space; /* Current "ideal" estimate of the space */ int t_rxtcur; /* current retransmit value (ticks) */ unsigned int t_maxseg; /* maximum segment size */ int t_srtt; /* smoothed round-trip time */ int t_rttvar; /* variance in round-trip time */ uint64_t t_accsleep_ms; /* accumulated sleep time since last boot */ uint16_t t_reassqlen; /* length of reassembly queue */ uint16_t t_rxtshift; /* log(2) of rexmt exp. backoff */ uint32_t t_rttmin; /* minimum rtt allowed */ uint32_t t_rttbest; /* best rtt we've seen */ uint32_t t_rttcur; /* most recent value of rtt */ uint32_t t_rttupdated; /* number of times rtt sampled */ uint32_t t_rxt_conndroptime; /* retxmt conn gets dropped after this time, when set */ uint32_t t_rxtstart; /* time at which retransmission started */ uint32_t max_sndwnd; /* largest window peer has offered */ int t_softerror; /* possible error not yet reported */ /* out-of-band data */ char t_oobflags; /* have some */ char t_iobc; /* input character */ #define TCPOOB_HAVEDATA 0x01 #define TCPOOB_HADDATA 0x02 /* RFC 1323 variables */ u_int8_t snd_scale; /* window scaling for send window */ u_int8_t rcv_scale; /* window scaling for recv window */ u_int8_t request_r_scale; /* pending window scaling */ u_int8_t requested_s_scale; u_int8_t tcp_cc_index; /* index of congestion control algorithm */ u_int8_t t_adaptive_rtimo; /* Read timeout used as a multiple of RTT */ u_int8_t t_adaptive_wtimo; /* Write timeout used as a multiple of RTT */ u_int8_t t_stretchack_delayed; /* stretch ack delayed */ /* State for limiting early retransmits when SACK is not enabled */ u_int16_t t_early_rexmt_count; /* count of early rexmts */ u_int32_t t_early_rexmt_win; /* window for limiting early rexmts */ u_int32_t ts_recent; /* timestamp echo data */ u_int32_t ts_recent_age; /* when last updated */ tcp_seq last_ack_sent; /* RFC 3465 variables */ u_int32_t t_bytes_acked; /* ABC "bytes_acked" parameter */ int t_lastchain; /* amount of packets chained last time around */ uint16_t t_unacksegs; /* received but unacked segments for delaying acks */ /* * Pretty arbitrary value ;-) * Goal is to make sure that some ACKs are being sent more frequently * to allow the other side to ramp-up. */ #define TCP_FORCED_ACKS_COUNT 16 uint16_t t_forced_acks; /* count of pure ACKs that need to be forced out */ uint8_t t_rexmtthresh; /* duplicate ack threshold for entering fast recovery */ uint8_t t_rtimo_probes; /* number of adaptive rtimo probes sent */ uint32_t t_persist_timeout; /* ZWP persistence limit as set by PERSIST_TIMEOUT */ uint32_t t_persist_stop; /* persistence limit deadline if triggered by ZWP */ uint32_t t_notsent_lowat; /* Low water for not sent data */ /* Receiver state for stretch-ack algorithm */ u_int32_t rcv_unackwin; /* to measure win for stretching acks */ u_int32_t rcv_by_unackwin; /* bytes seen during the last ack-stretching win */ u_int32_t rcv_by_unackhalfwin; u_int32_t rcv_nostrack_ts; /* timestamp when stretch ack was disabled automatically */ u_int32_t rcv_nostrack_pkts; /* pkts received since strech ack was disabled */ u_int16_t rcv_waitforss; /* wait for packets during slow-start */ /* ECN stats */ u_int16_t ecn_flags; #define TE_SETUPSENT 0x0001 /* Indicate we have sent ECN-SETUP SYN or SYN-ACK */ #define TE_SETUPRECEIVED 0x0002 /* Indicate we have received ECN-SETUP SYN or SYN-ACK */ #define TE_SENDIPECT 0x0004 /* Indicate we haven't sent or received non-ECN-setup SYN or SYN-ACK */ #define TE_SENDCWR 0x0008 /* Indicate that the next non-retransmit should have the TCP CWR flag set */ #define TE_SENDECE 0x0010 /* Indicate that the next packet should have the TCP ECE flag set */ #define TE_INRECOVERY 0x0020 /* connection entered recovery after receiving ECE */ #define TE_RECV_ECN_CE 0x0040 /* Received IPTOS_ECN_CE marking atleast once */ #define TE_RECV_ECN_ECE 0x0080 /* Received ECE marking atleast once */ #define TE_LOST_SYN 0x0100 /* Lost SYN with ECN setup */ #define TE_LOST_SYNACK 0x0200 /* Lost SYN-ACK with ECN setup */ #define TE_ECN_MODE_ENABLE 0x0400 /* Option ECN mode set to enable */ #define TE_ECN_MODE_DISABLE 0x0800 /* Option ECN mode set to disable */ #define TE_ENABLE_ECN 0x1000 /* Enable negotiation of ECN */ #define TE_ECN_ON (TE_SETUPSENT | TE_SETUPRECEIVED) /* Indicate ECN was successfully negotiated on a connection) */ #define TE_CEHEURI_SET 0x2000 /* We did our CE-probing at the beginning */ #define TE_CLIENT_SETUP 0x4000 /* setup from client side */ #define TE_RCVD_SYN_RST 0x8000 /* Received RST to the first ECN enabled SYN */ u_int32_t t_ecn_recv_ce; /* Received CE from the network */ u_int32_t t_ecn_recv_cwr; /* Packets received with CWR */ /* state for bad retransmit recovery */ u_int32_t snd_cwnd_prev; /* cwnd prior to retransmit */ u_int32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ int t_srtt_prev; /* srtt prior to retransmit */ int t_rttvar_prev; /* rttvar prior to retransmit */ u_int32_t t_badrexmt_time; /* bad rexmt detection time */ /* Packet reordering metric */ u_int32_t t_reorderwin; /* Reordering late time offset */ /* SACK related state */ int16_t snd_numholes; /* number of holes seen by sender */ tcp_seq sack_newdata; /* New data xmitted in this recovery * episode starts at this seq number */ TAILQ_HEAD(sackhole_head, sackhole) snd_holes; /* SACK scoreboard (sorted) */ tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ int rcv_numsacks; /* # distinct sack blks present */ struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ struct sackhint sackhint; /* SACK scoreboard hint */ tcp_seq send_highest_sack; /* Sequence number of fresh data sent after the most recent fast-retransmit */ int t_new_dupacks; /* Dupacks received above send_highest_sack */ struct mbuf *t_pktlist_head; /* First packet in transmit chain */ struct mbuf *t_pktlist_tail; /* Last packet in transmit chain */ u_int32_t t_pktlist_sentlen; /* total bytes in transmit chain */ u_int32_t t_keepidle; /* keepalive idle timer (override global if > 0) */ u_int32_t t_keepinit; /* connection timeout, i.e. idle time * in SYN_SENT or SYN_RECV state */ u_int32_t t_keepintvl; /* interval between keepalives */ u_int32_t t_keepcnt; /* number of keepalives before close */ u_int32_t tso_max_segment_size; /* TSO maximum segment unit for NIC */ u_int16_t t_pmtud_lastseg_size; /* size of the last sent segment */ u_int32_t t_pmtud_saved_maxopd; /* MSS saved before performing PMTU-D BlackHole detection */ u_int32_t t_pmtud_start_ts; /* Time of PMTUD blackhole detection */ struct{ u_int32_t rxduplicatebytes; u_int32_t rxoutoforderbytes; u_int32_t txretransmitbytes; u_int16_t synrxtshift; u_int16_t rxmitsyns; u_int16_t unused_pad_to_8; u_int32_t rxmitpkts; uint32_t delayed_acks_sent; uint32_t acks_delayed; } t_stat; u_int8_t t_notify_ack_count; u_int8_t t_ecn_recv_ce_pkt; /* Received packet with CE-bit set (independent from last_ack_sent) */ u_int32_t t_cached_maxopd; /* default for MSS adjustment using link status report */ uint32_t bg_ssthresh; /* Slow start threshold until delay increases */ uint32_t t_flagsext; /* Another field to accommodate more flags */ #define TF_RXTFINDROP 0x1 /* Drop conn after retransmitting FIN 3 times */ #define TF_RCVUNACK_WAITSS 0x2 /* set when the receiver should not stretch acks */ #define TF_BWMEAS_INPROGRESS 0x4 /* Indicate BW meas is happening */ #define TF_MEASURESNDBW 0x8 /* Measure send bw on this connection */ #define TF_LAST_IS_PSH 0x10 /* Indicates whether the last packet in the rcv socket buffer had the PUSH-flag set */ #define TF_SACK_ENABLE 0x20 /* SACK is enabled */ #define TF_RECOMPUTE_RTT 0x40 /* recompute RTT after spurious retransmit */ #define TF_DETECT_READSTALL 0x80 /* Used to detect a stall during read operation */ #define TF_RECV_THROTTLE 0x100 /* Input throttling active */ #define TF_NOSTRETCHACK 0x200 /* ack every other packet */ #define TF_NOTIMEWAIT 0x800 /* Avoid going into time-wait */ #define TF_SENT_TLPROBE 0x1000 /* Sent data in PTO */ #define TF_PKTS_REORDERED 0x2000 /* Detected reordering */ #define TF_DELAY_RECOVERY 0x4000 /* delay fast recovery */ #define TF_FORCE 0x8000 /* force 1 byte out */ #define TF_DISABLE_STRETCHACK 0x10000 /* auto-disable stretch ack */ #define TF_NOBLACKHOLE_DETECTION 0x20000 /* Disable PMTU blackhole detection */ #define TF_RESCUE_RXT 0x80000 /* SACK rescue retransmit */ #define TF_CWND_NONVALIDATED 0x100000 /* cwnd non validated */ #define TF_IF_PROBING 0x200000 /* Trigger interface probe timeout */ #define TF_FASTOPEN 0x400000 /* TCP Fastopen is enabled */ #define TF_REASS_INPROG 0x800000 /* Reassembly is in progress */ #define TF_FASTOPEN_FORCE_ENABLE 0x1000000 /* Force-enable TCP Fastopen */ #define TF_LOGGED_CONN_SUMMARY 0x2000000 /* Connection summary was logged */ #if TRAFFIC_MGT /* Inter-arrival jitter related state */ uint32_t iaj_rcv_ts; /* tcp clock when the first packet was received */ uint16_t iaj_size; /* Size of packet for iaj measurement */ uint8_t iaj_small_pkt; /* Count of packets smaller than iaj_size */ uint8_t t_pipeack_ind; /* index for next pipeack sample */ uint16_t iaj_pktcnt; /* packet count, to avoid throttling initially */ uint16_t acc_iaj; /* Accumulated iaj */ uint32_t avg_iaj; /* Mean */ uint32_t std_dev_iaj; /* Standard deviation */ #endif /* TRAFFIC_MGT */ struct bwmeas *t_bwmeas; /* State for bandwidth measurement */ tcp_seq t_idleat; /* rcv_nxt at idle time */ TAILQ_ENTRY(tcpcb) t_twentry; /* link for time wait queue */ struct tcp_ccstate *t_ccstate; /* congestion control related state */ /* Tail loss probe related state */ tcp_seq t_tlphighrxt; /* snd_nxt after PTO */ u_int32_t t_tlpstart; /* timestamp at PTO */ /* DSACK data receiver state */ tcp_seq t_dsack_lseq; /* DSACK left sequence */ tcp_seq t_dsack_rseq; /* DSACK right sequence */ /* DSACK data sender state */ SLIST_HEAD(tcp_rxt_seghead, tcp_rxt_seg) t_rxt_segments; tcp_seq t_dsack_lastuna; /* snd_una when last recovery episode started */ /* state for congestion window validation (draft-ietf-tcpm-newcwv-07) */ #define TCP_PIPEACK_SAMPLE_COUNT 3 u_int32_t t_pipeack_sample[TCP_PIPEACK_SAMPLE_COUNT]; /* pipeack, bytes acked within RTT */ tcp_seq t_pipeack_lastuna; /* una when pipeack measurement started */ u_int32_t t_pipeack; u_int32_t t_lossflightsize; #if MPTCP u_int32_t t_mpflags; /* flags for multipath TCP */ #define TMPF_PREESTABLISHED 0x00000001 /* conn in pre-established state */ #define TMPF_SND_KEYS 0x00000002 /* indicates that keys should be send */ #define TMPF_MPTCP_TRUE 0x00000004 /* negotiated MPTCP successfully */ #define TMPF_MPTCP_RCVD_KEY 0x00000008 /* state for 3-way handshake */ #define TMPF_SND_MPPRIO 0x00000010 /* send priority of subflow */ #define TMPF_SND_REM_ADDR 0x00000020 /* initiate address removal */ #define TMPF_RCVD_DACK 0x00000040 /* received a data-ack */ #define TMPF_JOINED_FLOW 0x00000080 /* Indicates additional flow */ #define TMPF_BACKUP_PATH 0x00000100 /* Indicates backup path */ #define TMPF_MPTCP_ACKNOW 0x00000200 /* Send Data ACK */ #define TMPF_SEND_DSN 0x00000400 /* Send DSN mapping */ #define TMPF_SEND_DFIN 0x00000800 /* Send Data FIN */ #define TMPF_RECV_DFIN 0x00001000 /* Recv Data FIN */ #define TMPF_SENT_JOIN 0x00002000 /* Sent Join */ #define TMPF_RECVD_JOIN 0x00004000 /* Received Join */ #define TMPF_RESET 0x00008000 /* Send RST */ #define TMPF_TCP_FALLBACK 0x00010000 /* Fallback to TCP */ #define TMPF_FASTCLOSERCV 0x00020000 /* Received Fastclose option */ #define TMPF_EMBED_DSN 0x00040000 /* tp has DSN mapping */ #define TMPF_MPTCP_READY 0x00080000 /* Can send DSS options on data */ #define TMPF_INFIN_SENT 0x00100000 /* Sent infinite mapping */ #define TMPF_SND_MPFAIL 0x00200000 /* Received mapping csum failure */ #define TMPF_SND_JACK 0x00400000 /* Send a Join-ACK */ #define TMPF_TFO_REQUEST 0x00800000 /* TFO Requested */ #define TMPF_MPTCP_SIGNALS (TMPF_SND_MPPRIO | TMPF_SND_REM_ADDR | TMPF_SND_MPFAIL | TMPF_SND_KEYS | TMPF_SND_JACK) tcp_seq t_mpuna; /* unacknowledged sequence */ struct mptcb *t_mptcb; /* pointer to MPTCP TCB */ struct mptsub *t_mpsub; /* pointer to the MPTCP subflow */ struct mpt_dsn_map t_rcv_map; /* Receive mapping list */ u_int8_t t_local_aid; /* Addr Id for authentication */ u_int8_t t_rem_aid; /* Addr ID of another subflow */ u_int8_t t_mprxtshift; /* join retransmission */ #endif /* MPTCP */ #define TFO_F_OFFER_COOKIE 0x01 /* We will offer a cookie */ #define TFO_F_COOKIE_VALID 0x02 /* The received cookie is valid */ #define TFO_F_COOKIE_REQ 0x04 /* Client requested a new cookie */ #define TFO_F_COOKIE_SENT 0x08 /* Client did send a cookie in the SYN */ #define TFO_F_SYN_LOSS 0x10 /* A SYN-loss triggered a fallback to regular TCP on the client-side */ #define TFO_F_NO_SNDPROBING 0x20 /* This network is guaranteed to support TFO in the upstream direction */ #define TFO_F_HEURISTIC_DONE 0x40 /* We have already marked this network as bad */ u_int8_t t_tfo_flags; #define TFO_S_SYNDATA_RCV 0x01 /* SYN+data has been received */ #define TFO_S_COOKIEREQ_RECV 0x02 /* TFO-cookie request received */ #define TFO_S_COOKIE_SENT 0x04 /* TFO-cookie announced in SYN/ACK */ #define TFO_S_COOKIE_INVALID 0x08 /* Received TFO-cookie is invalid */ #define TFO_S_COOKIE_REQ 0x10 /* TFO-cookie requested within the SYN */ #define TFO_S_COOKIE_RCV 0x20 /* TFO-cookie received in SYN/ACK */ #define TFO_S_SYN_DATA_SENT 0x40 /* SYN+data sent */ #define TFO_S_SYN_DATA_ACKED 0x80 /* SYN+data has been acknowledged in SYN/ACK */ #define TFO_S_SYN_LOSS 0x0100 /* SYN+TFO has been lost - fallback to regular TCP */ #define TFO_S_COOKIE_WRONG 0x0200 /* Cookie we sent in the SYN was wrong */ #define TFO_S_NO_COOKIE_RCV 0x0400 /* We asked for a cookie but didn't get one */ #define TFO_S_HEURISTICS_DISABLE 0x0800 /* TFO-heuristics disabled it for this connection */ #define TFO_S_SEND_BLACKHOLE 0x1000 /* TFO got blackholed in the send direction */ #define TFO_S_RECV_BLACKHOLE 0x2000 /* TFO got blackholed in the recv direction */ #define TFO_S_ONE_BYTE_PROXY 0x4000 /* TFO failed because of a proxy acknowledging just one byte */ u_int16_t t_tfo_stats; u_int8_t t_tfo_probes; /* TFO-probes we did send */ /* * This here is the TFO-probing state-machine. Transitions are as follows: * * Current state: PROBE_NONE * Event: SYN+DATA acknowledged * Action: Transition to PROBE_PROBING and set keepalive-timer * * Current state: PROBE_PROBING (initial state) * Event: Receive data * Action: Transition to PROBE_NONE and cancel keepalive-timer * Event: Receive ACK that does not indicate a hole * Action: Transition to PROBE_NONE and cancel keepalive-timer * Event: Receive ACK that indicates a hole * Action: Transition to PROBE_WAIT_DATA and set a short timer * to wait for the final segment. * Event: Keepalive-timeout (did not receive any segment) * Action: Signal ETIMEDOUT as with regular keepalive-timers * * Current state: PROBE_WAIT_DATA * Event: Receive data * Action: Transition to PROBE_NONE and cancel keepalive-timer * Event: Data-timeout (did not receive the expected data) * Action: Signal ENODATA up to the app and close everything. */ #define TFO_PROBE_NONE 0 /* Not probing now */ #define TFO_PROBE_PROBING 1 /* Sending out TCP-keepalives waiting for reply */ #define TFO_PROBE_WAIT_DATA 2 /* Received reply, waiting for data */ u_int8_t t_tfo_probe_state; u_int32_t t_rcvoopack; /* out-of-order packets received */ u_int32_t t_pawsdrop; /* segments dropped due to PAWS */ u_int32_t t_sack_recovery_episode; /* SACK recovery episodes */ u_int32_t t_reordered_pkts; /* packets reorderd */ u_int32_t t_dsack_sent; /* Sent DSACK notification */ u_int32_t t_dsack_recvd; /* Received a valid DSACK option */ SLIST_HEAD(, tcp_notify_ack_marker) t_notify_ack; /* state for notifying data acknowledgements */ u_int32_t t_recv_throttle_ts; /* TS for start of recv throttle */ u_int32_t t_rxt_minimum_timeout; /* minimum retransmit timeout in ms */ uint32_t t_challengeack_last; /* last time challenge ACK was sent per sec */ uint32_t t_challengeack_count; /* # of challenge ACKs already sent per sec */ u_int32_t t_log_flags; /* TCP logging flags*/ u_int32_t t_connect_time; /* time when the connection started */ uint32_t t_comp_gencnt; /* Current compression generation-count */ uint32_t t_comp_lastinc; /* Last time the gen-count was changed - should change every TCP_COMP_CHANGE_RATE ms */ #define TCP_COMP_CHANGE_RATE 5 /* Intervals at which we change the gencnt. Means that worst-case we send one ACK every TCP_COMP_CHANGE_RATE ms */ uint32_t t_ts_offset; /* Randomized timestamp offset to hide on-the-wire timestamp */ uuid_t t_fsw_uuid; uuid_t t_flow_uuid; }; #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) #define SACK_ENABLED(tp) (tp->t_flagsext & TF_SACK_ENABLE) /* * If the connection is in a throttled state due to advisory feedback from * the interface output queue, reset that state. We do this in favor * of entering recovery because the data transfer during recovery * should be just a trickle and it will help to improve performance. * We also do not want to back off twice in the same RTT. */ #define ENTER_FASTRECOVERY(_tp_) do { \ (_tp_)->t_flags |= TF_FASTRECOVERY; \ if (INP_IS_FLOW_CONTROLLED((_tp_)->t_inpcb)) \ inp_reset_fc_state((_tp_)->t_inpcb); \ if (!SLIST_EMPTY(&tp->t_rxt_segments)) \ tcp_rxtseg_clean(tp); \ (_tp_)->t_new_dupacks = 0; \ } while(0) #define EXIT_FASTRECOVERY(_tp_) do { \ (_tp_)->t_flags &= ~TF_FASTRECOVERY; \ (_tp_)->t_dupacks = 0; \ (_tp_)->t_new_dupacks = 0; \ (_tp_)->t_rexmtthresh = (uint8_t)tcprexmtthresh; \ (_tp_)->t_bytes_acked = 0; \ (_tp_)->ecn_flags &= ~TE_INRECOVERY; \ (_tp_)->t_timer[TCPT_PTO] = 0; \ (_tp_)->t_flagsext &= ~TF_RESCUE_RXT; \ (_tp_)->t_lossflightsize = 0; \ (_tp_)->sackhint.sack_bytes_acked = 0; \ } while(0) /* * When the number of duplicate acks received is less than * the retransmit threshold, use Limited Transmit algorithm */ extern int tcprexmtthresh; #define ALLOW_LIMITED_TRANSMIT(_tp_) \ ((_tp_)->t_dupacks > 0 && \ (_tp_)->t_dupacks < (_tp_)->t_rexmtthresh && \ ((_tp_)->t_flagsext & (TF_PKTS_REORDERED|TF_DELAY_RECOVERY)) \ != (TF_PKTS_REORDERED|TF_DELAY_RECOVERY)) /* * This condition is true is timestamp option is supported * on a connection. */ #define TSTMP_SUPPORTED(_tp_) \ (((_tp_)->t_flags & (TF_REQ_TSTMP|TF_RCVD_TSTMP)) == \ (TF_REQ_TSTMP|TF_RCVD_TSTMP)) /* * This condition is true if window scale option is supported * on a connection */ #define TCP_WINDOW_SCALE_ENABLED(_tp_) \ (((_tp_)->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) == \ (TF_RCVD_SCALE|TF_REQ_SCALE)) /* Is ECN enabled end-to-end */ #define TCP_ECN_ENABLED(_tp_) \ (((_tp_)->ecn_flags & (TE_ECN_ON)) == (TE_ECN_ON)) /* * Gives number of bytes acked by this ack */ #define BYTES_ACKED(_th_, _tp_) \ ((_th_)->th_ack - (_tp_)->snd_una) /* Returns true if a DSACK option should be sent */ #define TCP_SEND_DSACK_OPT(_tp_) \ ((_tp_)->t_dsack_lseq > 0 && (_tp_)->t_dsack_rseq > 0) /* * Returns true if a DSACK sequence is within the max send window that will * be accepted. In order to set a window to validate sequence numbers, the * max send window within which a DSACK option is processed is limited. * * We need to choose a maximum window to check if the sequence number is * within the window. One arbitrary choice is 256 * MSS because if the * window is as large as 256 segments it might be big enough to ignore the * DSACK option. Choosing a much larger limit means that the memory for * retransmit segments can be held for a longer time. */ #define TCP_DSACK_MAX_SEND_WINDOW(_tp_) (MIN((_tp_)->snd_wnd, tcp_autosndbuf_max)) #define TCP_DSACK_SEQ_IN_WINDOW(_tp_, _seq_, _una_) \ (SEQ_LEQ((_seq_), (_tp_)->snd_max) && \ SEQ_GEQ((_seq_), ((_una_) - TCP_DSACK_MAX_SEND_WINDOW(_tp_)))) #define TCP_RESET_REXMT_STATE(_tp_) do { \ (_tp_)->t_rxtshift = 0; \ (_tp_)->t_rxtstart = 0; \ mptcp_reset_rexmit_state((_tp_)); \ } while(0); #define TCP_IF_STATE_CHANGED(tp, probe_if_index) \ (probe_if_index > 0 && tp->t_inpcb->inp_last_outifp != NULL && \ probe_if_index == tp->t_inpcb->inp_last_outifp->if_index) /* * Structure to hold TCP options that are only used during segment * processing (in tcp_input), but not held in the tcpcb. * It's basically used to reduce the number of parameters * to tcp_dooptions. */ struct tcpopt { u_int32_t to_flags; /* which options are present */ #define TOF_TS 0x0001 /* timestamp */ #define TOF_MSS 0x0010 #define TOF_SCALE 0x0020 #define TOF_SIGNATURE 0x0040 /* signature option present */ #define TOF_SIGLEN 0x0080 /* signature length valid (RFC2385) */ #define TOF_SACK 0x0100 /* Peer sent SACK option */ #define TOF_MPTCP 0x0200 /* MPTCP options to be dropped */ #define TOF_TFO 0x0400 /* TFO cookie option present */ #define TOF_TFOREQ 0x0800 /* TFO cookie request present */ u_int32_t to_tsval; u_int32_t to_tsecr; u_int16_t to_mss; u_int8_t to_requested_s_scale; u_int8_t to_nsacks; /* number of SACK blocks */ u_char *to_sacks; /* pointer to the first SACK blocks */ u_char *to_tfo; /* pointer to the TFO cookie */ }; #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) /* TFO-specific defines */ #define TFO_COOKIE_LEN_MIN 4 #define TFO_COOKIE_LEN_DEFAULT 8 #define TFO_COOKIE_LEN_MAX 16 /* * The initial retransmission should happen at rtt + 4 * rttvar. * Because of the way we do the smoothing, srtt and rttvar * will each average +1/2 tick of bias. When we compute * the retransmit timer, we want 1/2 tick of rounding and * 1 extra tick because of +-1/2 tick uncertainty in the * firing of the timer. The bias will give us exactly the * 1.5 tick we need. But, because the bias is * statistical, we have to test that we don't drop below * the minimum feasible timer (which is 2 ticks). * This version of the macro adapted from a paper by Lawrence * Brakmo and Larry Peterson which outlines a problem caused * by insufficient precision in the original implementation, * which results in inappropriately large RTO values for very * fast networks. */ #define TCP_REXMTVAL(tp) \ max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) /* * Jaguar compatible TCP control block, for xtcpcb * Does not have the old fields */ struct otcpcb { #else struct tseg_qent; _TCPCB_LIST_HEAD(tsegqe_head, tseg_qent); struct tcpcb { #endif /* KERNEL_PRIVATE */ #if defined(KERNEL_PRIVATE) u_int32_t t_segq; #else struct tsegqe_head t_segq; #endif /* KERNEL_PRIVATE */ int t_dupacks; /* consecutive dup acks recd */ u_int32_t unused; /* unused now: was t_template */ int t_timer[TCPT_NTIMERS_EXT]; /* tcp timers */ _TCPCB_PTR(struct inpcb *) t_inpcb; /* back pointer to internet pcb */ int t_state; /* state of this connection */ u_int t_flags; #define TF_ACKNOW 0x00001 /* ack peer immediately */ #define TF_DELACK 0x00002 /* ack, but try to delay it */ #define TF_NODELAY 0x00004 /* don't delay packets to coalesce */ #define TF_NOOPT 0x00008 /* don't use tcp options */ #define TF_SENTFIN 0x00010 /* have sent FIN */ #define TF_REQ_SCALE 0x00020 /* have/will request window scaling */ #define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */ #define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */ #define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */ #define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */ #define TF_NEEDSYN 0x00400 /* send SYN (implicit state) - unused but needed for backwards compatibility */ #define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */ #define TF_NOPUSH 0x01000 /* don't push */ #define TF_REQ_CC 0x02000 /* have/will request CC */ #define TF_RCVD_CC 0x04000 /* a CC was received in SYN */ #define TF_SENDCCNEW 0x08000 /* Not implemented */ #define TF_MORETOCOME 0x10000 /* More data to be appended to sock */ #define TF_LQ_OVERFLOW 0x20000 /* listen queue overflow */ #define TF_RXWIN0SENT 0x40000 /* sent a receiver win 0 in response */ #define TF_SLOWLINK 0x80000 /* route is a on a modem speed link */ int t_force; /* 1 if forcing out a byte */ tcp_seq snd_una; /* send unacknowledged */ tcp_seq snd_max; /* highest sequence number sent; * used to recognize retransmits */ tcp_seq snd_nxt; /* send next */ tcp_seq snd_up; /* send urgent pointer */ tcp_seq snd_wl1; /* window update seg seq number */ tcp_seq snd_wl2; /* window update seg ack number */ tcp_seq iss; /* initial send sequence number */ tcp_seq irs; /* initial receive sequence number */ tcp_seq rcv_nxt; /* receive next */ tcp_seq rcv_adv; /* advertised window */ u_int32_t rcv_wnd; /* receive window */ tcp_seq rcv_up; /* receive urgent pointer */ u_int32_t snd_wnd; /* send window */ u_int32_t snd_cwnd; /* congestion-controlled window */ u_int32_t snd_ssthresh; /* snd_cwnd size threshold for * for slow start exponential to * linear switch */ u_int t_maxopd; /* mss plus options */ u_int32_t t_rcvtime; /* time at which a packet was received */ u_int32_t t_starttime; /* time connection was established */ int t_rtttime; /* round trip time */ tcp_seq t_rtseq; /* sequence number being timed */ int t_rxtcur; /* current retransmit value (ticks) */ u_int t_maxseg; /* maximum segment size */ int t_srtt; /* smoothed round-trip time */ int t_rttvar; /* variance in round-trip time */ int t_rxtshift; /* log(2) of rexmt exp. backoff */ u_int t_rttmin; /* minimum rtt allowed */ u_int32_t t_rttupdated; /* number of times rtt sampled */ u_int32_t max_sndwnd; /* largest window peer has offered */ int t_softerror; /* possible error not yet reported */ /* out-of-band data */ char t_oobflags; /* have some */ char t_iobc; /* input character */ #define TCPOOB_HAVEDATA 0x01 #define TCPOOB_HADDATA 0x02 /* RFC 1323 variables */ u_char snd_scale; /* window scaling for send window */ u_char rcv_scale; /* window scaling for recv window */ u_char request_r_scale; /* pending window scaling */ u_char requested_s_scale; u_int32_t ts_recent; /* timestamp echo data */ u_int32_t ts_recent_age; /* when last updated */ tcp_seq last_ack_sent; /* RFC 1644 variables */ tcp_cc cc_send; /* send connection count */ tcp_cc cc_recv; /* receive connection count */ tcp_seq snd_recover; /* for use in fast recovery */ /* experimental */ u_int32_t snd_cwnd_prev; /* cwnd prior to retransmit */ u_int32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ u_int32_t t_badrxtwin; /* window for retransmit recovery */ }; #define tcps_ecn_setup tcps_ecn_client_success #define tcps_sent_cwr tcps_ecn_recv_ece #define tcps_sent_ece tcps_ecn_sent_ece /* * TCP statistics. * Many of these should be kept per connection, * but that's inconvenient at the moment. */ struct tcpstat { u_int32_t tcps_connattempt; /* connections initiated */ u_int32_t tcps_accepts; /* connections accepted */ u_int32_t tcps_connects; /* connections established */ u_int32_t tcps_drops; /* connections dropped */ u_int32_t tcps_conndrops; /* embryonic connections dropped */ u_int32_t tcps_closed; /* conn. closed (includes drops) */ u_int32_t tcps_segstimed; /* segs where we tried to get rtt */ u_int32_t tcps_rttupdated; /* times we succeeded */ u_int32_t tcps_delack; /* delayed acks sent */ u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ u_int32_t tcps_rexmttimeo; /* retransmit timeouts */ u_int32_t tcps_persisttimeo; /* persist timeouts */ u_int32_t tcps_keeptimeo; /* keepalive timeouts */ u_int32_t tcps_keepprobe; /* keepalive probes sent */ u_int32_t tcps_keepdrops; /* connections dropped in keepalive */ u_int32_t tcps_sndtotal; /* total packets sent */ u_int32_t tcps_sndpack; /* data packets sent */ u_int32_t tcps_sndbyte; /* data bytes sent */ u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */ u_int32_t tcps_sndrexmitbyte; /* data bytes retransmitted */ u_int32_t tcps_sndacks; /* ack-only packets sent */ u_int32_t tcps_sndprobe; /* window probes sent */ u_int32_t tcps_sndurg; /* packets sent with URG only */ u_int32_t tcps_sndwinup; /* window update-only packets sent */ u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ u_int32_t tcps_rcvtotal; /* total packets received */ u_int32_t tcps_rcvpack; /* packets received in sequence */ u_int32_t tcps_rcvbyte; /* bytes received in sequence */ u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */ u_int32_t tcps_rcvbadoff; /* packets received with bad offset */ u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ u_int32_t tcps_rcvshort; /* packets received too short */ u_int32_t tcps_rcvduppack; /* duplicate-only packets received */ u_int32_t tcps_rcvdupbyte; /* duplicate-only bytes received */ u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */ u_int32_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ u_int32_t tcps_rcvoopack; /* out-of-order packets received */ u_int32_t tcps_rcvoobyte; /* out-of-order bytes received */ u_int32_t tcps_rcvpackafterwin; /* packets with data after window */ u_int32_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */ u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */ u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */ u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ u_int32_t tcps_rcvackpack; /* rcvd ack packets */ u_int32_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ u_int32_t tcps_rcvwinupd; /* rcvd window update packets */ u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */ u_int32_t tcps_predack; /* times hdr predict ok for acks */ u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */ u_int32_t tcps_pcbcachemiss; u_int32_t tcps_cachedrtt; /* times cached RTT in route updated */ u_int32_t tcps_cachedrttvar; /* times cached rttvar updated */ u_int32_t tcps_cachedssthresh; /* times cached ssthresh updated */ u_int32_t tcps_usedrtt; /* times RTT initialized from route */ u_int32_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ u_int32_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ u_int32_t tcps_persistdrop; /* timeout in persist state */ u_int32_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ u_int32_t tcps_mturesent; /* resends due to MTU discovery */ u_int32_t tcps_listendrop; /* listen queue overflows */ u_int32_t tcps_synchallenge; /* challenge ACK due to bad SYN */ u_int32_t tcps_rstchallenge; /* challenge ACK due to bad RST */ /* new stats from FreeBSD 5.4 sync up */ u_int32_t tcps_minmssdrops; /* average minmss too low drops */ u_int32_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ u_int32_t tcps_badrst; /* ignored RSTs in the window */ u_int32_t tcps_sc_added; /* entry added to syncache */ u_int32_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ u_int32_t tcps_sc_dupsyn; /* duplicate SYN packet */ u_int32_t tcps_sc_dropped; /* could not reply to packet */ u_int32_t tcps_sc_completed; /* successful extraction of entry */ u_int32_t tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ u_int32_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ u_int32_t tcps_sc_reset; /* RST removed entry from syncache */ u_int32_t tcps_sc_stale; /* timed out or listen socket gone */ u_int32_t tcps_sc_aborted; /* syncache entry aborted */ u_int32_t tcps_sc_badack; /* removed due to bad ACK */ u_int32_t tcps_sc_unreach; /* ICMP unreachable received */ u_int32_t tcps_sc_zonefail; /* zalloc() failed */ u_int32_t tcps_sc_sendcookie; /* SYN cookie sent */ u_int32_t tcps_sc_recvcookie; /* SYN cookie received */ u_int32_t tcps_hc_added; /* entry added to hostcache */ u_int32_t tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ /* SACK related stats */ u_int32_t tcps_sack_recovery_episode; /* SACK recovery episodes */ u_int32_t tcps_sack_rexmits; /* SACK rexmit segments */ u_int32_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ u_int32_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ u_int32_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ u_int32_t tcps_sack_sboverflow; /* SACK sendblock overflow */ u_int32_t tcps_bg_rcvtotal; /* total background packets received */ u_int32_t tcps_rxtfindrop; /* drop conn after retransmitting FIN */ u_int32_t tcps_fcholdpacket; /* packets withheld because of flow control */ u_int32_t tcps_limited_txt; /* Limited transmit used */ u_int32_t tcps_early_rexmt; /* Early retransmit used */ u_int32_t tcps_sack_ackadv; /* Cumulative ack advanced along with sack */ /* Checksum related stats */ u_int32_t tcps_rcv_swcsum; /* tcp swcksum (inbound), packets */ u_int32_t tcps_rcv_swcsum_bytes; /* tcp swcksum (inbound), bytes */ u_int32_t tcps_rcv6_swcsum; /* tcp6 swcksum (inbound), packets */ u_int32_t tcps_rcv6_swcsum_bytes; /* tcp6 swcksum (inbound), bytes */ u_int32_t tcps_snd_swcsum; /* tcp swcksum (outbound), packets */ u_int32_t tcps_snd_swcsum_bytes; /* tcp swcksum (outbound), bytes */ u_int32_t tcps_snd6_swcsum; /* tcp6 swcksum (outbound), packets */ u_int32_t tcps_snd6_swcsum_bytes; /* tcp6 swcksum (outbound), bytes */ u_int32_t tcps_unused_1; u_int32_t tcps_unused_2; u_int32_t tcps_unused_3; /* MPTCP Related stats */ u_int32_t tcps_invalid_mpcap; /* Invalid MPTCP capable opts */ u_int32_t tcps_invalid_joins; /* Invalid MPTCP joins */ u_int32_t tcps_mpcap_fallback; /* TCP fallback in primary */ u_int32_t tcps_join_fallback; /* No MPTCP in secondary */ u_int32_t tcps_estab_fallback; /* DSS option dropped */ u_int32_t tcps_invalid_opt; /* Catchall error stat */ u_int32_t tcps_mp_outofwin; /* Packet lies outside the * shared recv window */ u_int32_t tcps_mp_reducedwin; /* Reduced subflow window */ u_int32_t tcps_mp_badcsum; /* Bad DSS csum */ u_int32_t tcps_mp_oodata; /* Out of order data */ u_int32_t tcps_mp_switches; /* number of subflow switch */ u_int32_t tcps_mp_rcvtotal; /* number of rcvd packets */ u_int32_t tcps_mp_rcvbytes; /* number of bytes received */ u_int32_t tcps_mp_sndpacks; /* number of data packs sent */ u_int32_t tcps_mp_sndbytes; /* number of bytes sent */ u_int32_t tcps_join_rxmts; /* join ack retransmits */ u_int32_t tcps_tailloss_rto; /* RTO due to tail loss */ u_int32_t tcps_reordered_pkts; /* packets reorderd */ u_int32_t tcps_recovered_pkts; /* recovered after loss */ u_int32_t tcps_pto; /* probe timeout */ u_int32_t tcps_rto_after_pto; /* RTO after a probe */ u_int32_t tcps_tlp_recovery; /* TLP induced fast recovery */ u_int32_t tcps_tlp_recoverlastpkt; /* TLP recoverd last pkt */ u_int32_t tcps_ecn_client_success; /* client-side connection negotiated ECN */ u_int32_t tcps_ecn_recv_ece; /* ECE received, sent CWR */ u_int32_t tcps_ecn_sent_ece; /* Sent ECE notification */ u_int32_t tcps_detect_reordering; /* Detect pkt reordering */ u_int32_t tcps_delay_recovery; /* Delay fast recovery */ u_int32_t tcps_avoid_rxmt; /* Retransmission was avoided */ u_int32_t tcps_unnecessary_rxmt; /* Retransmission was not needed */ u_int32_t tcps_nostretchack; /* disabled stretch ack algorithm on a connection */ u_int32_t tcps_rescue_rxmt; /* SACK rescue retransmit */ u_int32_t tcps_pto_in_recovery; /* rescue retransmit in fast recovery */ u_int32_t tcps_pmtudbh_reverted; /* PMTU Blackhole detection, segment size reverted */ /* DSACK related statistics */ u_int32_t tcps_dsack_disable; /* DSACK disabled due to n/w duplication */ u_int32_t tcps_dsack_ackloss; /* ignore DSACK due to ack loss */ u_int32_t tcps_dsack_badrexmt; /* DSACK based bad rexmt recovery */ u_int32_t tcps_dsack_sent; /* Sent DSACK notification */ u_int32_t tcps_dsack_recvd; /* Received a valid DSACK option */ u_int32_t tcps_dsack_recvd_old; /* Received an out of window DSACK option */ /* MPTCP Subflow selection stats */ u_int32_t tcps_mp_sel_symtomsd; /* By symptomsd */ u_int32_t tcps_mp_sel_rtt; /* By RTT comparison */ u_int32_t tcps_mp_sel_rto; /* By RTO comparison */ u_int32_t tcps_mp_sel_peer; /* By peer's output pattern */ u_int32_t tcps_mp_num_probes; /* Number of probes sent */ u_int32_t tcps_mp_verdowngrade; /* MPTCP version downgrade */ u_int32_t tcps_drop_after_sleep; /* drop after long AP sleep */ u_int32_t tcps_probe_if; /* probe packets after interface availability */ u_int32_t tcps_probe_if_conflict; /* Can't send probe packets for interface */ u_int32_t tcps_ecn_client_setup; /* Attempted ECN setup from client side */ u_int32_t tcps_ecn_server_setup; /* Attempted ECN setup from server side */ u_int32_t tcps_ecn_server_success; /* server-side connection negotiated ECN */ u_int32_t tcps_ecn_lost_synack; /* Lost SYN-ACK with ECN setup */ u_int32_t tcps_ecn_lost_syn; /* Lost SYN with ECN setup */ u_int32_t tcps_ecn_not_supported; /* Server did not support ECN setup */ u_int32_t tcps_ecn_recv_ce; /* Received CE from the network */ u_int32_t tcps_ecn_conn_recv_ce; /* Number of connections received CE atleast once */ u_int32_t tcps_ecn_conn_recv_ece; /* Number of connections received ECE atleast once */ u_int32_t tcps_ecn_conn_plnoce; /* Number of connections that received no CE and sufferred packet loss */ u_int32_t tcps_ecn_conn_pl_ce; /* Number of connections that received CE and sufferred packet loss */ u_int32_t tcps_ecn_conn_nopl_ce; /* Number of connections that received CE and sufferred no packet loss */ u_int32_t tcps_ecn_fallback_synloss; /* Number of times we did fall back due to SYN-Loss */ u_int32_t tcps_ecn_fallback_reorder; /* Number of times we fallback because we detected the PAWS-issue */ u_int32_t tcps_ecn_fallback_ce; /* Number of times we fallback because we received too many CEs */ /* TFO-related statistics */ u_int32_t tcps_tfo_syn_data_rcv; /* Received a SYN+data with valid cookie */ u_int32_t tcps_tfo_cookie_req_rcv;/* Received a TFO cookie-request */ u_int32_t tcps_tfo_cookie_sent; /* Offered a TFO-cookie to the client */ u_int32_t tcps_tfo_cookie_invalid;/* Received an invalid TFO-cookie */ u_int32_t tcps_tfo_cookie_req; /* Cookie requested with the SYN */ u_int32_t tcps_tfo_cookie_rcv; /* Cookie received in a SYN/ACK */ u_int32_t tcps_tfo_syn_data_sent; /* SYN+data+cookie sent */ u_int32_t tcps_tfo_syn_data_acked;/* SYN+data has been acknowledged */ u_int32_t tcps_tfo_syn_loss; /* SYN+TFO has been lost and we fallback */ u_int32_t tcps_tfo_blackhole; /* TFO got blackholed by a middlebox. */ u_int32_t tcps_tfo_cookie_wrong; /* TFO-cookie we sent was wrong */ u_int32_t tcps_tfo_no_cookie_rcv; /* We asked for a cookie but didn't get one */ u_int32_t tcps_tfo_heuristics_disable; /* TFO got disabled due to heuristics */ u_int32_t tcps_tfo_sndblackhole; /* TFO got blackholed in the sending direction */ u_int32_t tcps_mss_to_default; /* Change MSS to default using link status report */ u_int32_t tcps_mss_to_medium; /* Change MSS to medium using link status report */ u_int32_t tcps_mss_to_low; /* Change MSS to low using link status report */ u_int32_t tcps_ecn_fallback_droprst; /* ECN fallback caused by connection drop due to RST */ u_int32_t tcps_ecn_fallback_droprxmt; /* ECN fallback due to drop after multiple retransmits */ u_int32_t tcps_ecn_fallback_synrst; /* ECN fallback due to rst after syn */ u_int32_t tcps_mptcp_rcvmemdrop; /* MPTCP packets dropped for lack of memory */ u_int32_t tcps_mptcp_rcvduppack; /* MPTCP duplicate-only packets received */ u_int32_t tcps_mptcp_rcvpackafterwin; /* MPTCP packets with data after window */ /* TCP timer statistics */ u_int32_t tcps_timer_drift_le_1_ms; /* Timer drift less or equal to 1 ms */ u_int32_t tcps_timer_drift_le_10_ms; /* Timer drift less or equal to 10 ms */ u_int32_t tcps_timer_drift_le_20_ms; /* Timer drift less or equal to 20 ms */ u_int32_t tcps_timer_drift_le_50_ms; /* Timer drift less or equal to 50 ms */ u_int32_t tcps_timer_drift_le_100_ms; /* Timer drift less or equal to 100 ms */ u_int32_t tcps_timer_drift_le_200_ms; /* Timer drift less or equal to 200 ms */ u_int32_t tcps_timer_drift_le_500_ms; /* Timer drift less or equal to 500 ms */ u_int32_t tcps_timer_drift_le_1000_ms; /* Timer drift less or equal to 1000 ms */ u_int32_t tcps_timer_drift_gt_1000_ms; /* Timer drift greater than 1000 ms */ u_int32_t tcps_mptcp_handover_attempt; /* Total number of MPTCP-attempts using handover mode */ u_int32_t tcps_mptcp_interactive_attempt; /* Total number of MPTCP-attempts using interactive mode */ u_int32_t tcps_mptcp_aggregate_attempt; /* Total number of MPTCP-attempts using aggregate mode */ u_int32_t tcps_mptcp_fp_handover_attempt; /* Same as previous three but only for first-party apps */ u_int32_t tcps_mptcp_fp_interactive_attempt; u_int32_t tcps_mptcp_fp_aggregate_attempt; u_int32_t tcps_mptcp_heuristic_fallback; /* Total number of MPTCP-connections that fell back due to heuristics */ u_int32_t tcps_mptcp_fp_heuristic_fallback; /* Same as previous but for first-party apps */ u_int32_t tcps_mptcp_handover_success_wifi; /* Total number of successfull handover-mode connections that *started* on WiFi */ u_int32_t tcps_mptcp_handover_success_cell; /* Total number of successfull handover-mode connections that *started* on Cell */ u_int32_t tcps_mptcp_interactive_success; /* Total number of interactive-mode connections that negotiated MPTCP */ u_int32_t tcps_mptcp_aggregate_success; /* Same as previous but for aggregate */ u_int32_t tcps_mptcp_fp_handover_success_wifi; /* Same as previous four, but for first-party apps */ u_int32_t tcps_mptcp_fp_handover_success_cell; u_int32_t tcps_mptcp_fp_interactive_success; u_int32_t tcps_mptcp_fp_aggregate_success; u_int32_t tcps_mptcp_handover_cell_from_wifi; /* Total number of connections that use cell in handover-mode (coming from WiFi) */ u_int32_t tcps_mptcp_handover_wifi_from_cell; /* Total number of connections that use WiFi in handover-mode (coming from cell) */ u_int32_t tcps_mptcp_interactive_cell_from_wifi; /* Total number of connections that use cell in interactive mode (coming from WiFi) */ u_int64_t tcps_mptcp_handover_cell_bytes; /* Total number of bytes sent on cell in handover-mode (on new subflows, ignoring initial one) */ u_int64_t tcps_mptcp_interactive_cell_bytes; /* Same as previous but for interactive */ u_int64_t tcps_mptcp_aggregate_cell_bytes; u_int64_t tcps_mptcp_handover_all_bytes; /* Total number of bytes sent in handover */ u_int64_t tcps_mptcp_interactive_all_bytes; u_int64_t tcps_mptcp_aggregate_all_bytes; u_int32_t tcps_mptcp_back_to_wifi; /* Total number of connections that succeed to move traffic away from cell (when starting on cell) */ u_int32_t tcps_mptcp_wifi_proxy; /* Total number of new subflows that fell back to regular TCP on cell */ u_int32_t tcps_mptcp_cell_proxy; /* Total number of new subflows that fell back to regular TCP on WiFi */ /* TCP offload statistics */ u_int32_t tcps_ka_offload_drops; /* Keep alive drops for timeout reported by firmware */ u_int32_t tcps_mptcp_triggered_cell; /* Total number of times an MPTCP-connection triggered cell bringup */ }; struct tcpstat_local { u_int64_t badformat; u_int64_t unspecv6; u_int64_t synfin; u_int64_t badformatipsec; u_int64_t noconnnolist; u_int64_t noconnlist; u_int64_t listbadsyn; u_int64_t icmp6unreach; u_int64_t deprecate6; u_int64_t ooopacket; u_int64_t rstinsynrcv; u_int64_t dospacket; u_int64_t cleanup; u_int64_t synwindow; }; #pragma pack(4) /* * TCB structure exported to user-land via sysctl(3). * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been * included. Not all of our clients do. */ struct xtcpcb { u_int32_t xt_len; #ifdef KERNEL_PRIVATE struct inpcb_compat xt_inp; #else struct inpcb xt_inp; #endif #ifdef KERNEL_PRIVATE struct otcpcb xt_tp; #else struct tcpcb xt_tp; #endif struct xsocket xt_socket; u_quad_t xt_alignment_hack; }; #if XNU_TARGET_OS_OSX || KERNEL || !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) struct xtcpcb64 { u_int32_t xt_len; struct xinpcb64 xt_inpcb; u_int64_t t_segq; int t_dupacks; /* consecutive dup acks recd */ int t_timer[TCPT_NTIMERS_EXT]; /* tcp timers */ int t_state; /* state of this connection */ u_int t_flags; int t_force; /* 1 if forcing out a byte */ tcp_seq snd_una; /* send unacknowledged */ tcp_seq snd_max; /* highest sequence number sent; * used to recognize retransmits */ tcp_seq snd_nxt; /* send next */ tcp_seq snd_up; /* send urgent pointer */ tcp_seq snd_wl1; /* window update seg seq number */ tcp_seq snd_wl2; /* window update seg ack number */ tcp_seq iss; /* initial send sequence number */ tcp_seq irs; /* initial receive sequence number */ tcp_seq rcv_nxt; /* receive next */ tcp_seq rcv_adv; /* advertised window */ u_int32_t rcv_wnd; /* receive window */ tcp_seq rcv_up; /* receive urgent pointer */ u_int32_t snd_wnd; /* send window */ u_int32_t snd_cwnd; /* congestion-controlled window */ u_int32_t snd_ssthresh; /* snd_cwnd size threshold for * for slow start exponential to * linear switch */ u_int t_maxopd; /* mss plus options */ u_int32_t t_rcvtime; /* time at which a packet was received */ u_int32_t t_starttime; /* time connection was established */ int t_rtttime; /* round trip time */ tcp_seq t_rtseq; /* sequence number being timed */ int t_rxtcur; /* current retransmit value (ticks) */ u_int t_maxseg; /* maximum segment size */ int t_srtt; /* smoothed round-trip time */ int t_rttvar; /* variance in round-trip time */ int t_rxtshift; /* log(2) of rexmt exp. backoff */ u_int t_rttmin; /* minimum rtt allowed */ u_int32_t t_rttupdated; /* number of times rtt sampled */ u_int32_t max_sndwnd; /* largest window peer has offered */ int t_softerror; /* possible error not yet reported */ /* out-of-band data */ char t_oobflags; /* have some */ char t_iobc; /* input character */ /* RFC 1323 variables */ u_char snd_scale; /* window scaling for send window */ u_char rcv_scale; /* window scaling for recv window */ u_char request_r_scale; /* pending window scaling */ u_char requested_s_scale; u_int32_t ts_recent; /* timestamp echo data */ u_int32_t ts_recent_age; /* when last updated */ tcp_seq last_ack_sent; /* RFC 1644 variables */ tcp_cc cc_send; /* send connection count */ tcp_cc cc_recv; /* receive connection count */ tcp_seq snd_recover; /* for use in fast recovery */ /* experimental */ u_int32_t snd_cwnd_prev; /* cwnd prior to retransmit */ u_int32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ u_int32_t t_badrxtwin; /* window for retransmit recovery */ u_quad_t xt_alignment_hack; }; #endif /* XNU_TARGET_OS_OSX || KERNEL || !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) */ #ifdef PRIVATE struct xtcpcb_n { u_int32_t xt_len; u_int32_t xt_kind; /* XSO_TCPCB */ u_int64_t t_segq; int t_dupacks; /* consecutive dup acks recd */ int t_timer[TCPT_NTIMERS_EXT]; /* tcp timers */ int t_state; /* state of this connection */ u_int t_flags; int t_force; /* 1 if forcing out a byte */ tcp_seq snd_una; /* send unacknowledged */ tcp_seq snd_max; /* highest sequence number sent; * used to recognize retransmits */ tcp_seq snd_nxt; /* send next */ tcp_seq snd_up; /* send urgent pointer */ tcp_seq snd_wl1; /* window update seg seq number */ tcp_seq snd_wl2; /* window update seg ack number */ tcp_seq iss; /* initial send sequence number */ tcp_seq irs; /* initial receive sequence number */ tcp_seq rcv_nxt; /* receive next */ tcp_seq rcv_adv; /* advertised window */ u_int32_t rcv_wnd; /* receive window */ tcp_seq rcv_up; /* receive urgent pointer */ u_int32_t snd_wnd; /* send window */ u_int32_t snd_cwnd; /* congestion-controlled window */ u_int32_t snd_ssthresh; /* snd_cwnd size threshold for * for slow start exponential to * linear switch */ u_int t_maxopd; /* mss plus options */ u_int32_t t_rcvtime; /* time at which a packet was received */ u_int32_t t_starttime; /* time connection was established */ int t_rtttime; /* round trip time */ tcp_seq t_rtseq; /* sequence number being timed */ int t_rxtcur; /* current retransmit value (ticks) */ u_int t_maxseg; /* maximum segment size */ int t_srtt; /* smoothed round-trip time */ int t_rttvar; /* variance in round-trip time */ int t_rxtshift; /* log(2) of rexmt exp. backoff */ u_int t_rttmin; /* minimum rtt allowed */ u_int32_t t_rttupdated; /* number of times rtt sampled */ u_int32_t max_sndwnd; /* largest window peer has offered */ int t_softerror; /* possible error not yet reported */ /* out-of-band data */ char t_oobflags; /* have some */ char t_iobc; /* input character */ /* RFC 1323 variables */ u_char snd_scale; /* window scaling for send window */ u_char rcv_scale; /* window scaling for recv window */ u_char request_r_scale; /* pending window scaling */ u_char requested_s_scale; u_int32_t ts_recent; /* timestamp echo data */ u_int32_t ts_recent_age; /* when last updated */ tcp_seq last_ack_sent; /* RFC 1644 variables */ tcp_cc cc_send; /* send connection count */ tcp_cc cc_recv; /* receive connection count */ tcp_seq snd_recover; /* for use in fast recovery */ /* experimental */ u_int32_t snd_cwnd_prev; /* cwnd prior to retransmit */ u_int32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ }; /* * The rtt measured is in milliseconds as the timestamp granularity is * a millisecond. The smoothed round-trip time and estimated variance * are stored as fixed point numbers scaled by the values below. * For convenience, these scales are also used in smoothing the average * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). * With these scales, srtt has 5 bits to the right of the binary point, * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the * binary point, and is smoothed with an ALPHA of 0.75. */ #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ #define TCP_RTT_SHIFT 5 /* shift for srtt; 5 bits frac. */ #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 4 bits */ #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 4 bits */ #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ /* * TCP structure with information that gives insight into forward progress on an interface, * exported to user-land via sysctl(3). */ struct xtcpprogress_indicators { u_int32_t xp_numflows; /* Total number of flows */ u_int32_t xp_conn_probe_fails; /* Count of connection failures */ u_int32_t xp_read_probe_fails; /* Count of read probe failures */ u_int32_t xp_write_probe_fails; /* Count of write failures */ u_int32_t xp_recentflows; /* Total of "recent" flows */ u_int32_t xp_recentflows_unacked; /* Total of "recent" flows with unacknowledged data */ u_int64_t xp_recentflows_rxbytes; /* Total of "recent" flows received bytes */ u_int64_t xp_recentflows_txbytes; /* Total of "recent" flows transmitted bytes */ u_int64_t xp_recentflows_rxooo; /* Total of "recent" flows received out of order bytes */ u_int64_t xp_recentflows_rxdup; /* Total of "recent" flows received duplicate bytes */ u_int64_t xp_recentflows_retx; /* Total of "recent" flows retransmitted bytes */ u_int64_t xp_reserved1; /* Expansion */ u_int64_t xp_reserved2; /* Expansion */ u_int64_t xp_reserved3; /* Expansion */ u_int64_t xp_reserved4; /* Expansion */ }; struct tcpprogressreq { u_int64_t ifindex; /* Interface index for progress indicators */ u_int64_t recentflow_maxduration; /* In mach_absolute_time, max duration for flow to be counted as "recent" */ u_int64_t filter_flags; /* Optional additional filtering, values are interface properties per ntstat.h */ u_int64_t xp_reserved2; /* Expansion */ }; #endif /* PRIVATE */ #pragma pack() /* * Names for TCP sysctl objects */ #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ #define TCPCTL_MSSDFLT 3 /* MSS default */ #define TCPCTL_STATS 4 /* statistics (read-only) */ #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ #define TCPCTL_SENDSPACE 8 /* send buffer space */ #define TCPCTL_RECVSPACE 9 /* receive buffer space */ #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ #define TCPCTL_MAXID 14 #ifdef BSD_KERNEL_PRIVATE #include <sys/bitstring.h> #define TCP_PKTLIST_CLEAR(tp) { \ (tp)->t_pktlist_head = (tp)->t_pktlist_tail = NULL; \ (tp)->t_lastchain = (tp)->t_pktlist_sentlen = 0; \ } extern int tcp_TCPTV_MIN; #ifdef SYSCTL_DECL SYSCTL_DECL(_net_inet_tcp); #endif /* SYSCTL_DECL */ extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ extern struct inpcbinfo tcbinfo; extern struct tcpstat tcpstat; /* tcp statistics */ extern int tcp_mssdflt; /* XXX */ extern int tcp_minmss; #define TCP_FASTOPEN_SERVER 0x01 #define TCP_FASTOPEN_CLIENT 0x02 extern int tcp_tfo_halfcnt; extern int tcp_tfo_backlog; extern int tcp_fastopen; extern int ss_fltsz_local; extern int target_qdelay; extern u_int32_t tcp_now; /* for RFC 1323 timestamps */ extern struct timeval tcp_uptime; extern lck_spin_t *tcp_uptime_lock; extern int tcp_delack_enabled; extern int maxseg_unacked; extern int tcp_use_newreno; extern struct zone *tcp_reass_zone; extern struct zone *tcp_rxt_seg_zone; extern int tcp_ecn_outbound; extern int tcp_ecn_inbound; extern uint32_t tcp_do_autorcvbuf; extern uint32_t tcp_autorcvbuf_max; extern int tcp_recv_bg; extern int tcp_do_ack_compression; extern int tcp_randomize_timestamps; /* * Dummy value used for when there is no flow and we want to ensure that compression * can happen. */ #define TCP_ACK_COMPRESSION_DUMMY 1 extern int tcp_do_better_lr; extern int tcp_cubic_minor_fixes; extern int tcp_cubic_rfc_compliant; extern int tcp_flow_control_response; struct protosw; struct domain; struct tcp_respond_args { unsigned int ifscope; unsigned int nocell:1, noexpensive:1, awdl_unrestricted:1, intcoproc_allowed:1, keep_alive:1, noconstrained:1; }; void tcp_canceltimers(struct tcpcb *); struct tcpcb * tcp_close(struct tcpcb *); void tcp_ctlinput(int, struct sockaddr *, void *, struct ifnet *); int tcp_ctloutput(struct socket *, struct sockopt *); struct tcpcb * tcp_drop(struct tcpcb *, int); void tcp_drain(void); void tcp_getrt_rtt(struct tcpcb *tp, struct rtentry *rt); void tcp_init(struct protosw *, struct domain *); void tcp_input(struct mbuf *, int); void tcp_mss(struct tcpcb *, int, unsigned int); int tcp_mssopt(struct tcpcb *); void tcp_drop_syn_sent(struct inpcb *, int); void tcp_mtudisc(struct inpcb *, int); struct tcpcb * tcp_newtcpcb(struct inpcb *); int tcp_output(struct tcpcb *); void tcp_respond(struct tcpcb *, void *, struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, uint8_t, struct tcp_respond_args *); struct rtentry * tcp_rtlookup(struct inpcb *, unsigned int); void tcp_setpersist(struct tcpcb *); void tcp_gc(struct inpcbinfo *); void tcp_itimer(struct inpcbinfo *ipi); void tcp_check_timer_state(struct tcpcb *tp); void tcp_run_timerlist(void *arg1, void *arg2); void tcp_sched_timers(struct tcpcb *tp); struct tcptemp *tcp_maketemplate(struct tcpcb *); void tcp_fillheaders(struct tcpcb *, void *, void *); struct tcpcb *tcp_timers(struct tcpcb *, int); void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); void tcp_fill_info(struct tcpcb *, struct tcp_info *); void tcp_sack_doack(struct tcpcb *, struct tcpopt *, struct tcphdr *, u_int32_t *, uint32_t *); extern boolean_t tcp_sack_process_dsack(struct tcpcb *, struct tcpopt *, struct tcphdr *); int tcp_detect_bad_rexmt(struct tcpcb *, struct tcphdr *, struct tcpopt *, u_int32_t rxtime); void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); void tcp_clean_sackreport(struct tcpcb *tp); void tcp_sack_adjust(struct tcpcb *tp); struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); void tcp_free_sackholes(struct tcpcb *tp); void tcp_sack_lost_rexmit(struct tcpcb *tp); int32_t tcp_sbspace(struct tcpcb *tp); void tcp_set_tso(struct tcpcb *tp, struct ifnet *ifp); void tcp_set_ecn(struct tcpcb *tp, struct ifnet *ifp); int tcp_flight_size(struct tcpcb *tp); void tcp_reset_stretch_ack(struct tcpcb *tp); extern void tcp_get_ports_used(u_int32_t, int, u_int32_t, bitstr_t *); uint32_t tcp_count_opportunistic(unsigned int ifindex, u_int32_t flags); uint32_t tcp_find_anypcb_byaddr(struct ifaddr *ifa); void tcp_set_max_rwinscale(struct tcpcb *tp, struct socket *so); struct bwmeas* tcp_bwmeas_alloc(struct tcpcb *tp); void tcp_bwmeas_free(struct tcpcb *tp); extern int32_t timer_diff(uint32_t t1, uint32_t toff1, uint32_t t2, uint32_t toff2); extern void tcp_set_background_cc(struct socket *); extern void tcp_set_foreground_cc(struct socket *); extern void tcp_set_recv_bg(struct socket *); extern void tcp_clear_recv_bg(struct socket *); extern boolean_t tcp_sack_byte_islost(struct tcpcb *tp); #define IS_TCP_RECV_BG(_so) \ ((_so)->so_flags1 & SOF1_TRAFFIC_MGT_TCP_RECVBG) #if TRAFFIC_MGT #define CLEAR_IAJ_STATE(_tp_) (_tp_)->iaj_rcv_ts = 0 void reset_acc_iaj(struct tcpcb *tp); #endif /* TRAFFIC_MGT */ int tcp_lock(struct socket *, int, void *); int tcp_unlock(struct socket *, int, void *); void calculate_tcp_clock(void); extern void tcp_keepalive_reset(struct tcpcb *); extern uint32_t get_base_rtt(struct tcpcb *tp); #ifdef _KERN_LOCKS_H_ lck_mtx_t * tcp_getlock(struct socket *, int); #else void * tcp_getlock(struct socket *, int); #endif extern struct pr_usrreqs tcp_usrreqs; extern u_int32_t tcp_sendspace; extern u_int32_t tcp_recvspace; tcp_seq tcp_new_isn(struct tcpcb *); extern int tcp_input_checksum(int, struct mbuf *, struct tcphdr *, int, int); extern void tcp_getconninfo(struct socket *, struct conninfo_tcp *); extern void add_to_time_wait(struct tcpcb *, uint32_t delay); extern void tcp_pmtud_revert_segment_size(struct tcpcb *tp); extern void tcp_rxtseg_insert(struct tcpcb *, tcp_seq, tcp_seq); extern struct tcp_rxt_seg *tcp_rxtseg_find(struct tcpcb *, tcp_seq, tcp_seq); extern void tcp_rxtseg_set_spurious(struct tcpcb *tp, tcp_seq start, tcp_seq end); extern void tcp_rxtseg_clean(struct tcpcb *); extern boolean_t tcp_rxtseg_detect_bad_rexmt(struct tcpcb *, tcp_seq); extern boolean_t tcp_rxtseg_dsack_for_tlp(struct tcpcb *); extern u_int32_t tcp_rxtseg_total_size(struct tcpcb *tp); extern void tcp_rexmt_save_state(struct tcpcb *tp); extern void tcp_interface_send_probe(u_int16_t if_index_available); extern void tcp_probe_connectivity(struct ifnet *ifp, u_int32_t enable); extern void tcp_get_connectivity_status(struct tcpcb *, struct tcp_conn_status *); extern void tcp_clear_keep_alive_offload(struct socket *so); extern void tcp_fill_keepalive_offload_frames(struct ifnet *, struct ifnet_keepalive_offload_frame *, u_int32_t, size_t, u_int32_t *); extern int tcp_notify_kao_timeout(ifnet_t ifp, struct ifnet_keepalive_offload_frame *frame); extern boolean_t tfo_enabled(const struct tcpcb *tp); extern void tcp_disable_tfo(struct tcpcb *tp); extern void tcp_tfo_gen_cookie(struct inpcb *inp, u_char *out, size_t blk_size); #define TCP_FASTOPEN_KEYLEN 16 extern int tcp_freeq(struct tcpcb *tp); extern errno_t tcp_notify_ack_id_valid(struct tcpcb *, struct socket *, u_int32_t); extern errno_t tcp_add_notify_ack_marker(struct tcpcb *, u_int32_t); extern void tcp_notify_ack_free(struct tcpcb *); extern void tcp_notify_acknowledgement(struct tcpcb *, struct socket *); extern void tcp_get_notify_ack_count(struct tcpcb *, struct tcp_notify_ack_complete *); extern void tcp_get_notify_ack_ids(struct tcpcb *tp, struct tcp_notify_ack_complete *); extern void tcp_update_mss_locked(struct socket *, struct ifnet *); extern int get_tcp_inp_list(struct inpcb **, int, inp_gen_t); extern bool tcp_notify_ack_active(struct socket *so); #if MPTCP extern int mptcp_input_preproc(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th, int drop_hdrlen); extern uint16_t mptcp_output_csum(struct mbuf *m, uint64_t dss_val, uint32_t sseq, uint16_t dlen); extern int mptcp_adj_mss(struct tcpcb *, boolean_t); extern void mptcp_insert_rmap(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th); #endif __private_extern__ void tcp_update_stats_per_flow( struct ifnet_stats_per_flow *, struct ifnet *); #define TCP_ACK_STRATEGY_LEGACY 0 #define TCP_ACK_STRATEGY_MODERN 1 extern int tcp_ack_strategy; #define tcp_add_fsw_flow(...) #define tcp_del_fsw_flow(...) #endif /* BSD_KERNEL_PRIVATE */ #endif /* _NETINET_TCP_VAR_H_ */