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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 #include #include #include #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 #define TCP_RETRANSHZ 1000 /* granularity of TCP timestamps, 1ms */ #define TCP_TIMERHZ 100 /* frequency of TCP fast timer, 100 ms */ /* Minimum time quantum within which the timers are coalesced */ #define TCP_FASTTIMER_QUANTUM TCP_TIMERHZ /* fast mode, once every 100ms */ #define TCP_SLOWTIMER_QUANTUM (TCP_RETRANSHZ/2) /* slow mode, once every 500ms */ #define TCP_RETRANSHZ_TO_USEC 1000 #ifdef KERNEL_PRIVATE #define N_TIME_WAIT_SLOTS 128 /* must be power of 2 */ /* Base RTT is stored for N_MIN_RTT_HISTORY slots. This is used to * estimate expected minimum RTT for delay based congestion control * algorithms. */ #define N_RTT_BASE 5 /* Always allow at least 4 packets worth of recv window when adjusting * recv window using inter-packet arrival jitter. */ #define MIN_IAJ_WIN 4 /* 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 /* * 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); extern int tcp_reass_maxseg; extern int tcp_reass_qsize; #ifdef MALLOC_DECLARE MALLOC_DECLARE(M_TSEGQ); #endif 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 */ TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ }; struct sackhint { struct sackhole *nexthole; int sack_bytes_rexmit; }; 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 bw */ }; /* 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 */ }; #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ /* * 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 */ uint32_t t_timer[TCPT_NTIMERS]; /* tcp timers */ struct tcptimerentry tentry; /* entry in timer list */ struct inpcb *t_inpcb; /* back pointer to internet pcb */ int t_state; /* state of this connection */ 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) */ #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 /* send CCnew instead of CC in SYN */ #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_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 */ 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 */ tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 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; /* tcp clock when rtt calculation was started */ tcp_seq t_rtseq; /* sequence number being timed */ u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ u_int32_t rfbuf_cnt; /* recv buffer autoscaling byte count */ 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_int t_rttbest; /* best rtt we've seen */ u_int t_rttcur; /* most recent value of rtt */ u_int32_t t_rttupdated; /* number of times rtt sampled */ u_int32_t t_rxt_conndroptime; /* retxmt conn gets dropped after this time, when set */ u_int32_t t_rxtstart; /* time at which retransmission started */ 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_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_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 */ /* RFC 3465 variables */ u_int32_t t_bytes_acked; /* ABC "bytes_acked" parameter */ int t_lastchain; /* amount of packets chained last time around */ u_int16_t t_unacksegs; /* received but unacked segments for delaying acks */ u_int8_t t_rexmtthresh; /* duplicate ack threshold for entering fast recovery */ u_int8_t t_rtimo_probes; /* number of adaptive rtimo probes sent */ u_int32_t t_persist_timeout; /* ZWP persistence limit as set by PERSIST_TIMEOUT */ u_int32_t t_persist_stop; /* persistence limit deadline if triggered by ZWP */ u_int32_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_int16_t rcv_waitforss; /* wait for packets during slow-start */ u_int16_t ecn_flags; #define TE_SETUPSENT 0x01 /* Indicate we have sent ECN-SETUP SYN or SYN-ACK */ #define TE_SETUPRECEIVED 0x02 /* Indicate we have received ECN-SETUP SYN or SYN-ACK */ #define TE_SENDIPECT 0x04 /* Indicate we haven't sent or received non-ECN-setup SYN or SYN-ACK */ #define TE_SENDCWR 0x08 /* Indicate that the next non-retransmit should have the TCP CWR flag set */ #define TE_SENDECE 0x10 /* Indicate that the next packet should have the TCP ECE flag set */ #define TE_ECN_ON (TE_SETUPSENT | TE_SETUPRECEIVED) /* Indicate ECN was successfully negotiated on a connection) */ /* 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 */ /* state to limit the number of early retransmits */ u_int32_t t_early_rexmt_win; /* window for limiting early retransmits */ u_int16_t t_early_rexmt_count; /* number of early rexmts seen in past window */ /* SACK related state */ int16_t snd_numholes; /* number of holes seen by sender */ 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 */ tcp_seq sack_newdata; /* New data xmitted in this recovery episode starts at this seq number */ struct sackhint sackhint; /* SACK scoreboard hint */ u_int32_t t_pktlist_sentlen; /* total bytes in transmit chain */ struct mbuf *t_pktlist_head; /* First packet in transmit chain */ struct mbuf *t_pktlist_tail; /* Last packet 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; /* TCP Segment Offloading maximum segment unit for NIC */ u_int t_pmtud_saved_maxopd; /* MSS saved before performing PMTU-D BlackHole detection */ struct { u_int32_t rxduplicatebytes; u_int32_t rxoutoforderbytes; u_int32_t txretransmitbytes; u_int8_t synrxtshift; u_int8_t unused; u_int16_t unused_pad_to_8; } t_stat; /* Background congestion related state */ uint32_t rtt_hist[N_RTT_BASE]; /* history of minimum RTT */ uint32_t rtt_count; /* Number of RTT samples in recent base history */ 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_LRO_OFFLOADED 0x10 /* Connection LRO offloaded */ #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_STREAMEOW 0x400 /* Last packet was small indicating end of write */ #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 */ uint16_t iaj_small_pkt; /* Count of packets smaller than iaj_size */ uint16_t iaj_pktcnt; /* packet count, to avoid throttling initially */ uint16_t acc_iaj; /* Accumulated iaj */ tcp_seq iaj_rwintop; /* recent max advertised window */ uint32_t avg_iaj; /* Mean */ uint32_t std_dev_iaj; /* Standard deviation */ #endif /* TRAFFIC_MGT */ struct bwmeas *t_bwmeas; /* State for bandwidth measurement */ uint32_t t_lropktlen; /* Bytes in a LRO frame */ tcp_seq t_idleat; /* rcv_nxt at idle time */ TAILQ_ENTRY(tcpcb) t_twentry; /* link for time wait queue */ #if MPTCP u_int32_t t_mpflags; /* flags for multipath TCP */ #define TMPF_PREESTABLISHED 0x00000001 /* conn in pre-established state */ #define TMPF_SENT_KEYS 0x00000002 /* indicates that keys were sent */ #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_UNUSED 0x00000040 /* address addition acked by peer */ #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_FASTCLOSE 0x00020000 /* Send 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 */ void *t_mptcb; /* pointer to MPTCP TCB */ tcp_seq t_mpuna; /* unacknowledged sequence */ 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 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); \ } while(0) #define EXIT_FASTRECOVERY(_tp_) do { \ (_tp_)->t_flags &= ~TF_FASTRECOVERY; \ (_tp_)->t_dupacks = 0; \ (_tp_)->t_rexmtthresh = tcprexmtthresh; \ (_tp_)->t_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) /* * 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)) /* * Gives number of bytes acked by this ack */ #define BYTES_ACKED(_th_, _tp_) \ ((_th_)->th_ack - (_tp_)->snd_una) #if CONFIG_DTRACE enum tcp_cc_event { TCP_CC_CWND_INIT, TCP_CC_INSEQ_ACK_RCVD, TCP_CC_ACK_RCVD, TCP_CC_ENTER_FASTRECOVERY, TCP_CC_IN_FASTRECOVERY, TCP_CC_EXIT_FASTRECOVERY, TCP_CC_PARTIAL_ACK, TCP_CC_IDLE_TIMEOUT, TCP_CC_REXMT_TIMEOUT, TCP_CC_ECN_RCVD, TCP_CC_BAD_REXMT_RECOVERY, TCP_CC_OUTPUT_ERROR, TCP_CC_CHANGE_ALGO, TCP_CC_FLOW_CONTROL, TCP_CC_SUSPEND, TCP_CC_LIMITED_TRANSMIT, TCP_CC_EARLY_RETRANSMIT }; #endif /* CONFIG_DTRACE */ /* * 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 */ 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 */ }; /* * The TAO cache entry which is stored in the protocol family specific * portion of the route metrics. */ struct rmxp_tao { tcp_cc tao_cc; /* latest CC in valid SYN */ tcp_cc tao_ccsent; /* latest CC sent to peer */ u_short tao_mssopt; /* peer's cached MSS */ #ifdef notyet u_short tao_flags; /* cache status flags */ #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ #define TAOF_UNDEF 0 /* we don't know yet */ #endif /* notyet */ }; #define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) /* * 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 */ /* * 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) */ #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 /* send CCnew instead of CC in SYN */ #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 */ }; /* * 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 */ /* 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 */ /* LRO related stats */ u_int32_t tcps_coalesced_pack; /* number of coalesced packets */ u_int32_t tcps_flowtbl_full; /* times flow table was full */ u_int32_t tcps_flowtbl_collision; /* collisions in flow tbl */ u_int32_t tcps_lro_twopack; /* 2 packets coalesced */ u_int32_t tcps_lro_multpack; /* 3 or 4 pkts coalesced */ u_int32_t tcps_lro_largepack; /* 5 or more pkts coalesced */ 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_msg_unopkts; /* unordered packet on TCP msg stream */ u_int32_t tcps_msg_unoappendfail; /* failed to append unordered pkt */ u_int32_t tcps_msg_sndwaithipri; /* send is waiting for high priority data */ /* 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 */ }; 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; }; 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; }; #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 */ }; #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 #define TCP_PKTLIST_CLEAR(tp) { \ (tp)->t_pktlist_head = (tp)->t_pktlist_tail = NULL; \ (tp)->t_lastchain = (tp)->t_pktlist_sentlen = 0; \ } #define TCPCTL_NAMES { \ { 0, 0 }, \ { "rfc1323", CTLTYPE_INT }, \ { "rfc1644", CTLTYPE_INT }, \ { "mssdflt", CTLTYPE_INT }, \ { "stats", CTLTYPE_STRUCT }, \ { "rttdflt", CTLTYPE_INT }, \ { "keepidle", CTLTYPE_INT }, \ { "keepintvl", CTLTYPE_INT }, \ { "sendspace", CTLTYPE_INT }, \ { "recvspace", CTLTYPE_INT }, \ { "keepinit", CTLTYPE_INT }, \ { "pcblist", CTLTYPE_STRUCT }, \ { "delacktime", CTLTYPE_INT }, \ { "v6mssdflt", CTLTYPE_INT }, \ } #ifdef SYSCTL_DECL SYSCTL_DECL(_net_inet_tcp); #endif /* SYSCTL_DECL */ /* * Flags for TCP's connectx(2) user-protocol request routine. */ #if MPTCP #define TCP_CONNREQF_MPTCP 0x1 /* called internally by MPTCP */ #endif /* MPTCP */ 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; extern int ss_fltsz; extern int ss_fltsz_local; extern int tcp_do_rfc3390; /* Calculate ss_fltsz according to RFC 3390 */ extern int target_qdelay; #ifdef __APPLE__ 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; #endif /* __APPLE__ */ extern int tcp_do_sack; /* SACK enabled/disabled */ #if CONFIG_IFEF_NOWINDOWSCALE extern int tcp_obey_ifef_nowindowscale; #endif struct protosw; struct domain; void tcp_canceltimers(struct tcpcb *); struct tcpcb * tcp_close(struct tcpcb *); void tcp_ctlinput(int, struct sockaddr *, void *); 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); struct rmxp_tao * tcp_gettaocache(struct inpcb *); 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, int, unsigned int, unsigned int); struct rtentry *tcp_rtlookup(struct inpcb *, unsigned int); void tcp_setpersist(struct tcpcb *); void tcp_gc(struct inpcbinfo *); void tcp_check_timer_state(struct tcpcb *tp); void tcp_run_timerlist(void *arg1, void *arg2); 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_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq, u_int32_t *); 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); int32_t tcp_sbspace(struct tcpcb *tp); void tcp_set_tso(struct tcpcb *tp, struct ifnet *ifp); 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 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 *); #define IS_TCP_RECV_BG(_so) \ ((_so)->so_traffic_mgt_flags & 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 mptcp_insert_rmap(struct tcpcb *, struct mbuf *); extern void tcp_keepalive_reset(struct tcpcb *); #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 *); #if MPTCP extern uint16_t mptcp_input_csum(struct tcpcb *, struct mbuf *, int); extern void mptcp_output_csum(struct tcpcb *, struct mbuf *, int32_t, unsigned, u_int64_t, u_int32_t *); extern int mptcp_adj_mss(struct tcpcb *, boolean_t); #endif #endif /* BSD_KERNEL_RPIVATE */ #endif /* _NETINET_TCP_VAR_H_ */