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806 lines
29 KiB
C
806 lines
29 KiB
C
/* $OpenBSD: tcp_var.h,v 1.178 2024/05/13 01:15:53 jsg Exp $ */
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/* $NetBSD: tcp_var.h,v 1.17 1996/02/13 23:44:24 christos Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp_var.h 8.3 (Berkeley) 4/10/94
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*/
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#ifndef _NETINET_TCP_VAR_H_
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#define _NETINET_TCP_VAR_H_
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#include <sys/timeout.h>
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/*
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* Kernel variables for tcp.
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*/
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struct sackblk {
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tcp_seq start; /* start seq no. of sack block */
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tcp_seq end; /* end seq no. */
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};
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struct sackhole {
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tcp_seq start; /* start seq no. of hole */
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tcp_seq end; /* end seq no. */
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int dups; /* number of dup(s)acks for this hole */
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tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
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struct sackhole *next; /* next in list */
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};
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/*
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* TCP sequence queue structures.
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*/
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TAILQ_HEAD(tcpqehead, tcpqent);
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struct tcpqent {
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TAILQ_ENTRY(tcpqent) tcpqe_q;
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struct tcphdr *tcpqe_tcp;
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struct mbuf *tcpqe_m; /* mbuf contains packet */
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};
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/*
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* Tcp control block, one per tcp; fields:
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*/
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struct tcpcb {
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struct tcpqehead t_segq; /* sequencing queue */
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struct timeout t_timer[TCPT_NTIMERS]; /* tcp timers */
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short t_state; /* state of this connection */
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short t_rxtshift; /* log(2) of rexmt exp. backoff */
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int t_rxtcur; /* current retransmit value */
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short t_dupacks; /* consecutive dup acks recd */
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u_short t_maxseg; /* maximum segment size */
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char t_force; /* 1 if forcing out a byte */
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u_int t_flags;
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#define TF_ACKNOW 0x0001U /* ack peer immediately */
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#define TF_NODELAY 0x0004U /* don't delay packets to coalesce */
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#define TF_NOOPT 0x0008U /* don't use tcp options */
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#define TF_SENTFIN 0x0010U /* have sent FIN */
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#define TF_REQ_SCALE 0x0020U /* have/will request window scaling */
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#define TF_RCVD_SCALE 0x0040U /* other side has requested scaling */
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#define TF_REQ_TSTMP 0x0080U /* have/will request timestamps */
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#define TF_RCVD_TSTMP 0x0100U /* a timestamp was received in SYN */
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#define TF_SACK_PERMIT 0x0200U /* other side said I could SACK */
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#define TF_SIGNATURE 0x0400U /* require TCP MD5 signature */
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#ifdef TCP_ECN
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#define TF_ECN_PERMIT 0x00008000U /* other side said I could ECN */
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#define TF_RCVD_CE 0x00010000U /* send ECE in subsequent segs */
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#define TF_SEND_CWR 0x00020000U /* send CWR in next seg */
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#define TF_DISABLE_ECN 0x00040000U /* disable ECN for this connection */
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#endif
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#define TF_LASTIDLE 0x00100000U /* no outstanding ACK on last send */
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#define TF_PMTUD_PEND 0x00400000U /* Path MTU Discovery pending */
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#define TF_NEEDOUTPUT 0x00800000U /* call tcp_output after tcp_input */
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#define TF_BLOCKOUTPUT 0x01000000U /* avert tcp_output during tcp_input */
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#define TF_NOPUSH 0x02000000U /* don't push */
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#define TF_TMR_REXMT 0x04000000U /* retransmit timer armed */
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#define TF_TMR_PERSIST 0x08000000U /* retransmit persistence timer armed */
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#define TF_TMR_KEEP 0x10000000U /* keep alive timer armed */
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#define TF_TMR_2MSL 0x20000000U /* 2*msl quiet time timer armed */
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#define TF_TMR_REAPER 0x40000000U /* delayed cleanup timer armed, dead */
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#define TF_TMR_DELACK 0x80000000U /* delayed ack timer armed */
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#define TF_TIMER TF_TMR_REXMT /* used to shift with TCPT values */
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struct mbuf *t_template; /* skeletal packet for transmit */
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struct inpcb *t_inpcb; /* back pointer to internet pcb */
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/*
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* The following fields are used as in the protocol specification.
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* See RFC793, Dec. 1981, page 21.
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*/
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/* send sequence variables */
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tcp_seq snd_una; /* send unacknowledged */
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tcp_seq snd_nxt; /* send next */
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tcp_seq snd_up; /* send urgent pointer */
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tcp_seq snd_wl1; /* window update seg seq number */
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tcp_seq snd_wl2; /* window update seg ack number */
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tcp_seq iss; /* initial send sequence number */
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u_long snd_wnd; /* send window */
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int sack_enable; /* enable SACK for this connection */
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int snd_numholes; /* number of holes seen by sender */
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struct sackhole *snd_holes; /* linked list of holes (sorted) */
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tcp_seq snd_last; /* for use in fast recovery */
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/* receive sequence variables */
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u_long rcv_wnd; /* receive window */
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tcp_seq rcv_nxt; /* receive next */
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tcp_seq rcv_up; /* receive urgent pointer */
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tcp_seq irs; /* initial receive sequence number */
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tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/
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int rcv_numsacks; /* # distinct sack blks present */
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struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
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/*
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* Additional variables for this implementation.
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*/
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/* receive variables */
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tcp_seq rcv_adv; /* advertised window */
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/* retransmit variables */
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tcp_seq snd_max; /* highest sequence number sent;
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* used to recognize retransmits
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*/
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/* congestion control (for slow start, source quench, retransmit after loss) */
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u_long snd_cwnd; /* congestion-controlled window */
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u_long snd_ssthresh; /* snd_cwnd size threshold for
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* for slow start exponential to
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* linear switch
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*/
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/* auto-sizing variables */
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uint64_t rfbuf_ts; /* recv buffer autoscaling time stamp */
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u_int rfbuf_cnt; /* recv buffer autoscaling byte count */
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u_short t_maxopd; /* mss plus options */
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u_short t_peermss; /* peer's maximum segment size */
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/*
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* transmit timing stuff. See below for scale of srtt and rttvar.
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* "Variance" is actually smoothed difference.
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*/
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uint64_t t_rcvtime; /* time last segment received */
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uint64_t t_rcvacktime; /* time last ack received */
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uint64_t t_sndtime; /* time last segment sent */
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uint64_t t_sndacktime; /* time last ack sent */
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uint64_t t_rtttime; /* time we started measuring rtt */
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tcp_seq t_rtseq; /* sequence number being timed */
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int t_srtt; /* smoothed round-trip time */
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int t_rttvar; /* variance in round-trip time */
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u_int t_rttmin; /* minimum rtt allowed */
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u_long max_sndwnd; /* largest window peer has offered */
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/* out-of-band data */
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char t_oobflags; /* have some */
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char t_iobc; /* input character */
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#define TCPOOB_HAVEDATA 0x01
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#define TCPOOB_HADDATA 0x02
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short t_softerror; /* possible error not yet reported */
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/* RFC 1323 variables */
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u_char snd_scale; /* window scaling for send window */
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u_char rcv_scale; /* window scaling for recv window */
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u_char request_r_scale; /* pending window scaling */
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u_char requested_s_scale;
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uint32_t ts_recent; /* timestamp echo data */
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uint32_t ts_modulate; /* modulation on timestamp */
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uint64_t ts_recent_age; /* when last updated */
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tcp_seq last_ack_sent;
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/* pointer for syn cache entries*/
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LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */
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/* Path-MTU Discovery Information */
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u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */
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u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */
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tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */
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u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */
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u_short t_pmtud_ip_len; /* IP length from ICMP payload */
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u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */
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int pf;
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/* maintain a few stats per connection: */
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u_int t_rcvoopack; /* out-of-order packets received */
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u_int t_sndrexmitpack; /* retransmit packets sent */
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u_int t_sndzerowin; /* zero-window updates sent */
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};
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#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
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#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
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#ifdef _KERNEL
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/*
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* Handy way of passing around TCP option info.
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*/
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struct tcp_opt_info {
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int ts_present;
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u_int32_t ts_val;
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u_int32_t ts_ecr;
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u_int16_t maxseg;
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};
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/*
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* Data for the TCP compressed state engine.
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*/
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/*
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* Locks used to protect global data and struct members:
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* I immutable after creation
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* N net lock
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* S syn_cache_mtx tcp syn cache global mutex
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*/
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extern struct mutex syn_cache_mtx;
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#define TCP_SYN_HASH_SIZE 293
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#define TCP_SYN_BUCKET_SIZE 35
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union syn_cache_sa {
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struct sockaddr sa;
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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};
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struct syn_cache {
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TAILQ_ENTRY(syn_cache) sc_bucketq; /* [S] link on bucket list */
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struct refcnt sc_refcnt; /* ref count list and timer */
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struct timeout sc_timer; /* rexmt timer */
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struct route sc_route; /* [N] cached route */
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long sc_win; /* [I] advertised window */
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struct syn_cache_head *sc_buckethead; /* [S] our bucket index */
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struct syn_cache_set *sc_set; /* [S] our syn cache set */
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u_int64_t sc_timestamp; /* [N] timestamp from SYN */
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u_int32_t sc_hash; /* [S] */
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u_int32_t sc_modulate; /* [I] our timestamp modulator */
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union syn_cache_sa sc_src; /* [I] */
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union syn_cache_sa sc_dst; /* [I] */
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tcp_seq sc_irs; /* [I] */
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tcp_seq sc_iss; /* [I] */
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u_int sc_rtableid; /* [I] */
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u_int sc_rxtcur; /* [S] current rxt timeout */
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u_int sc_rxttot; /* [S] total time spend on queues */
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u_int sc_rxtshift; /* [S] for computing backoff */
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u_int sc_dynflags; /* [S] flags accessed with mutex */
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#define SCF_UNREACH 0x0001U /* we've had an unreach error */
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#define SCF_DEAD 0x0002U /* this entry to be released */
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u_short sc_fixflags; /* [I] set during initialization */
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#define SCF_TIMESTAMP 0x0010U /* peer will do timestamps */
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#define SCF_SACK_PERMIT 0x0020U /* permit sack */
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#define SCF_ECN_PERMIT 0x0040U /* permit ecn */
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#define SCF_SIGNATURE 0x0080U /* enforce tcp signatures */
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struct mbuf *sc_ipopts; /* [N] IP options */
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u_int16_t sc_peermaxseg; /* [I] */
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u_int16_t sc_ourmaxseg; /* [I] */
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u_int sc_request_r_scale : 4, /* [I] */
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sc_requested_s_scale : 4; /* [I] */
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struct tcpcb *sc_tp; /* [S] tcb for listening socket */
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LIST_ENTRY(syn_cache) sc_tpq; /* [S] list of entries by same tp */
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};
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struct syn_cache_head {
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TAILQ_HEAD(, syn_cache) sch_bucket; /* [S] bucket entries */
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u_short sch_length; /* [S] # entries in bucket */
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};
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struct syn_cache_set {
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struct syn_cache_head *scs_buckethead; /* [S] */
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long scs_use; /* [S] */
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int scs_size; /* [S] current size of hash table */
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int scs_count; /* [S] */
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u_int32_t scs_random[5]; /* [S] */
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};
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#endif /* _KERNEL */
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/*
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* The smoothed round-trip time and estimated variance
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* are stored as fixed point numbers scaled by the values below.
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* For convenience, these scales are also used in smoothing the average
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* (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
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* With these scales, srtt has 5 bits to the right of the binary point,
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* and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the
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* binary point, and is smoothed with an ALPHA of 0.75.
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*/
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#define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */
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#define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */
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#define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */
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#define TCP_RTT_MAX (1<<18) /* maximum rtt */
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/*
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* The initial retransmission should happen at rtt + 4 * rttvar.
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* Because of the way we do the smoothing, srtt and rttvar
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* will each average +1/2 tick of bias. When we compute
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* the retransmit timer, we want 1/2 tick of rounding and
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* 1 extra tick because of +-1/2 tick uncertainty in the
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* firing of the timer. The bias will give us exactly the
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* 1.5 tick we need. But, because the bias is
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* statistical, we have to test that we don't drop below
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* the minimum feasible timer (which is 2 ticks).
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* This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT)
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* is the same as the multiplier for rttvar.
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*/
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#define TCP_REXMTVAL(tp) \
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((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) \
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>> TCP_RTT_BASE_SHIFT)
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/*
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* TCP statistics.
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* Many of these should be kept per connection,
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* but that's inconvenient at the moment.
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*/
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struct tcpstat {
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u_int32_t tcps_connattempt; /* connections initiated */
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u_int32_t tcps_accepts; /* connections accepted */
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u_int32_t tcps_connects; /* connections established */
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u_int32_t tcps_drops; /* connections dropped */
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u_int32_t tcps_conndrops; /* embryonic connections dropped */
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u_int32_t tcps_closed; /* conn. closed (includes drops) */
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u_int32_t tcps_segstimed; /* segs where we tried to get rtt */
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u_int32_t tcps_rttupdated; /* times we succeeded */
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u_int32_t tcps_delack; /* delayed acks sent */
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u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
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u_int32_t tcps_rexmttimeo; /* retransmit timeouts */
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u_int32_t tcps_persisttimeo; /* persist timeouts */
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u_int32_t tcps_persistdrop; /* connections dropped in persist */
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u_int32_t tcps_keeptimeo; /* keepalive timeouts */
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u_int32_t tcps_keepprobe; /* keepalive probes sent */
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u_int32_t tcps_keepdrops; /* connections dropped in keepalive */
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u_int32_t tcps_sndtotal; /* total packets sent */
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u_int32_t tcps_sndpack; /* data packets sent */
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u_int64_t tcps_sndbyte; /* data bytes sent */
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u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */
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u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
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u_int64_t tcps_sndrexmitfast; /* Fast retransmits */
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u_int32_t tcps_sndacks; /* ack-only packets sent */
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u_int32_t tcps_sndprobe; /* window probes sent */
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u_int32_t tcps_sndurg; /* packets sent with URG only */
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u_int32_t tcps_sndwinup; /* window update-only packets sent */
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u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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u_int32_t tcps_rcvtotal; /* total packets received */
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u_int32_t tcps_rcvpack; /* packets received in sequence */
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u_int64_t tcps_rcvbyte; /* bytes received in sequence */
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u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */
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u_int32_t tcps_rcvbadoff; /* packets received with bad offset */
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u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */
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u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */
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u_int32_t tcps_rcvshort; /* packets received too short */
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u_int32_t tcps_rcvduppack; /* duplicate-only packets received */
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u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
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u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */
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u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
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u_int32_t tcps_rcvoopack; /* out-of-order packets received */
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u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */
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u_int32_t tcps_rcvpackafterwin; /* packets with data after window */
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u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
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u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */
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u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */
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u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */
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u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
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u_int32_t tcps_rcvacktooold; /* rcvd acks for old data */
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u_int32_t tcps_rcvackpack; /* rcvd ack packets */
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u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
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u_int32_t tcps_rcvwinupd; /* rcvd window update packets */
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u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */
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u_int32_t tcps_predack; /* times hdr predict ok for acks */
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u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */
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u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */
|
|
u_int32_t tcps_noport; /* no socket on port */
|
|
u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */
|
|
u_int32_t tcps_dropsyn; /* SYN packet dropped */
|
|
|
|
u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */
|
|
u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */
|
|
u_int32_t tcps_inswcsum; /* input software-checksummed pkts */
|
|
u_int32_t tcps_outswcsum; /* output software-checksummed pkts */
|
|
|
|
/* ECN stats */
|
|
u_int32_t tcps_ecn_accepts; /* ecn connections accepted */
|
|
u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */
|
|
u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */
|
|
u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */
|
|
u_int32_t tcps_ecn_sndect; /* # of cwr sent */
|
|
u_int32_t tcps_ecn_sndece; /* # of ece sent */
|
|
u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */
|
|
u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */
|
|
u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */
|
|
u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */
|
|
|
|
/* These statistics deal with the SYN cache. */
|
|
u_int64_t tcps_sc_added; /* # of entries added */
|
|
u_int64_t tcps_sc_completed; /* # of connections completed */
|
|
u_int64_t tcps_sc_timed_out; /* # of entries timed out */
|
|
u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */
|
|
u_int64_t tcps_sc_reset; /* # dropped due to RST */
|
|
u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */
|
|
u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */
|
|
u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */
|
|
u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */
|
|
u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */
|
|
u_int64_t tcps_sc_collisions; /* # of hash collisions */
|
|
u_int64_t tcps_sc_retransmitted;/* # of retransmissions */
|
|
u_int64_t tcps_sc_seedrandom; /* # of syn cache seeds with random */
|
|
u_int64_t tcps_sc_hash_size; /* hash buckets in current syn cache */
|
|
u_int64_t tcps_sc_entry_count; /* # of entries in current syn cache */
|
|
u_int64_t tcps_sc_entry_limit; /* limit of syn cache entries */
|
|
u_int64_t tcps_sc_bucket_maxlen;/* maximum # of entries in any bucket */
|
|
u_int64_t tcps_sc_bucket_limit; /* limit of syn cache bucket list */
|
|
int64_t tcps_sc_uses_left; /* use counter of current syn cache */
|
|
|
|
u_int64_t tcps_conndrained; /* # of connections drained */
|
|
|
|
u_int64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
|
|
u_int64_t tcps_sack_rexmits; /* SACK rexmit segments */
|
|
u_int64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
|
|
u_int64_t tcps_sack_rcv_opts; /* SACK options received */
|
|
u_int64_t tcps_sack_snd_opts; /* SACK options sent */
|
|
u_int64_t tcps_sack_drop_opts; /* SACK options dropped */
|
|
|
|
u_int32_t tcps_outswtso; /* output tso chopped in software */
|
|
u_int32_t tcps_outhwtso; /* output tso processed by hardware */
|
|
u_int32_t tcps_outpkttso; /* packets generated by tso */
|
|
u_int32_t tcps_outbadtso; /* output tso failed, packet dropped */
|
|
u_int32_t tcps_inswlro; /* input lro on pseudo device */
|
|
u_int32_t tcps_inhwlro; /* input lro from hardware */
|
|
u_int32_t tcps_inpktlro; /* packets coalesced by hardware lro */
|
|
u_int32_t tcps_inbadlro; /* input bad lro packets */
|
|
};
|
|
|
|
/*
|
|
* Names for TCP sysctl objects.
|
|
*/
|
|
|
|
#define TCPCTL_RFC1323 1 /* enable RFC1323 timestamps/scaling */
|
|
#define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */
|
|
#define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */
|
|
#define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */
|
|
#define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */
|
|
#define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */
|
|
#define TCPCTL_RECVSPACE 7 /* receive buffer space */
|
|
#define TCPCTL_SENDSPACE 8 /* send buffer space */
|
|
#define TCPCTL_IDENT 9 /* get connection owner */
|
|
#define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */
|
|
#define TCPCTL_MSSDFLT 11 /* Default maximum segment size */
|
|
#define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */
|
|
#define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */
|
|
#define TCPCTL_ECN 14 /* RFC3168 ECN */
|
|
#define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */
|
|
#define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */
|
|
#define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */
|
|
#define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */
|
|
#define TCPCTL_DROP 19 /* drop tcp connection */
|
|
#define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */
|
|
#define TCPCTL_STATS 21 /* TCP statistics */
|
|
#define TCPCTL_ALWAYS_KEEPALIVE 22 /* assume SO_KEEPALIVE is always set */
|
|
#define TCPCTL_SYN_USE_LIMIT 23 /* number of uses before reseeding hash */
|
|
#define TCPCTL_ROOTONLY 24 /* return root only port bitmap */
|
|
#define TCPCTL_SYN_HASH_SIZE 25 /* number of buckets in the hash */
|
|
#define TCPCTL_TSO 26 /* enable TCP segmentation offload */
|
|
#define TCPCTL_MAXID 27
|
|
|
|
#define TCPCTL_NAMES { \
|
|
{ 0, 0 }, \
|
|
{ "rfc1323", CTLTYPE_INT }, \
|
|
{ "keepinittime", CTLTYPE_INT }, \
|
|
{ "keepidle", CTLTYPE_INT }, \
|
|
{ "keepintvl", CTLTYPE_INT }, \
|
|
{ NULL, 0 }, \
|
|
{ "baddynamic", CTLTYPE_STRUCT }, \
|
|
{ NULL, 0 }, \
|
|
{ NULL, 0 }, \
|
|
{ "ident", CTLTYPE_STRUCT }, \
|
|
{ "sack", CTLTYPE_INT }, \
|
|
{ "mssdflt", CTLTYPE_INT }, \
|
|
{ "rstppslimit", CTLTYPE_INT }, \
|
|
{ "ackonpush", CTLTYPE_INT }, \
|
|
{ "ecn", CTLTYPE_INT }, \
|
|
{ "syncachelimit", CTLTYPE_INT }, \
|
|
{ "synbucketlimit", CTLTYPE_INT }, \
|
|
{ "rfc3390", CTLTYPE_INT }, \
|
|
{ "reasslimit", CTLTYPE_INT }, \
|
|
{ "drop", CTLTYPE_STRUCT }, \
|
|
{ "sackholelimit", CTLTYPE_INT }, \
|
|
{ "stats", CTLTYPE_STRUCT }, \
|
|
{ "always_keepalive", CTLTYPE_INT }, \
|
|
{ "synuselimit", CTLTYPE_INT }, \
|
|
{ "rootonly", CTLTYPE_STRUCT }, \
|
|
{ "synhashsize", CTLTYPE_INT }, \
|
|
{ "tso", CTLTYPE_INT }, \
|
|
}
|
|
|
|
struct tcp_ident_mapping {
|
|
struct sockaddr_storage faddr, laddr;
|
|
int euid, ruid;
|
|
u_int rdomain;
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#include <sys/percpu.h>
|
|
#include <sys/stat.h>
|
|
|
|
enum tcpstat_counters {
|
|
tcps_connattempt,
|
|
tcps_accepts,
|
|
tcps_connects,
|
|
tcps_drops,
|
|
tcps_conndrops,
|
|
tcps_closed,
|
|
tcps_segstimed,
|
|
tcps_rttupdated,
|
|
tcps_delack,
|
|
tcps_timeoutdrop,
|
|
tcps_rexmttimeo,
|
|
tcps_persisttimeo,
|
|
tcps_persistdrop,
|
|
tcps_keeptimeo,
|
|
tcps_keepprobe,
|
|
tcps_keepdrops,
|
|
tcps_sndtotal,
|
|
tcps_sndpack,
|
|
tcps_sndbyte,
|
|
tcps_sndrexmitpack,
|
|
tcps_sndrexmitbyte,
|
|
tcps_sndrexmitfast,
|
|
tcps_sndacks,
|
|
tcps_sndprobe,
|
|
tcps_sndurg,
|
|
tcps_sndwinup,
|
|
tcps_sndctrl,
|
|
tcps_rcvtotal,
|
|
tcps_rcvpack,
|
|
tcps_rcvbyte,
|
|
tcps_rcvbadsum,
|
|
tcps_rcvbadoff,
|
|
tcps_rcvmemdrop,
|
|
tcps_rcvnosec,
|
|
tcps_rcvshort,
|
|
tcps_rcvduppack,
|
|
tcps_rcvdupbyte,
|
|
tcps_rcvpartduppack,
|
|
tcps_rcvpartdupbyte,
|
|
tcps_rcvoopack,
|
|
tcps_rcvoobyte,
|
|
tcps_rcvpackafterwin,
|
|
tcps_rcvbyteafterwin,
|
|
tcps_rcvafterclose,
|
|
tcps_rcvwinprobe,
|
|
tcps_rcvdupack,
|
|
tcps_rcvacktoomuch,
|
|
tcps_rcvacktooold,
|
|
tcps_rcvackpack,
|
|
tcps_rcvackbyte,
|
|
tcps_rcvwinupd,
|
|
tcps_pawsdrop,
|
|
tcps_predack,
|
|
tcps_preddat,
|
|
tcps_pcbhashmiss,
|
|
tcps_noport,
|
|
tcps_badsyn,
|
|
tcps_dropsyn,
|
|
tcps_rcvbadsig,
|
|
tcps_rcvgoodsig,
|
|
tcps_inswcsum,
|
|
tcps_outswcsum,
|
|
tcps_ecn_accepts,
|
|
tcps_ecn_rcvece,
|
|
tcps_ecn_rcvcwr,
|
|
tcps_ecn_rcvce,
|
|
tcps_ecn_sndect,
|
|
tcps_ecn_sndece,
|
|
tcps_ecn_sndcwr,
|
|
tcps_cwr_ecn,
|
|
tcps_cwr_frecovery,
|
|
tcps_cwr_timeout,
|
|
tcps_sc_added,
|
|
tcps_sc_completed,
|
|
tcps_sc_timed_out,
|
|
tcps_sc_overflowed,
|
|
tcps_sc_reset,
|
|
tcps_sc_unreach,
|
|
tcps_sc_bucketoverflow,
|
|
tcps_sc_aborted,
|
|
tcps_sc_dupesyn,
|
|
tcps_sc_dropped,
|
|
tcps_sc_collisions,
|
|
tcps_sc_retransmitted,
|
|
tcps_sc_seedrandom,
|
|
tcps_sc_hash_size,
|
|
tcps_sc_entry_count,
|
|
tcps_sc_entry_limit,
|
|
tcps_sc_bucket_maxlen,
|
|
tcps_sc_bucket_limit,
|
|
tcps_sc_uses_left,
|
|
tcps_conndrained,
|
|
tcps_sack_recovery_episode,
|
|
tcps_sack_rexmits,
|
|
tcps_sack_rexmit_bytes,
|
|
tcps_sack_rcv_opts,
|
|
tcps_sack_snd_opts,
|
|
tcps_sack_drop_opts,
|
|
tcps_outswtso,
|
|
tcps_outhwtso,
|
|
tcps_outpkttso,
|
|
tcps_outbadtso,
|
|
tcps_inswlro,
|
|
tcps_inhwlro,
|
|
tcps_inpktlro,
|
|
tcps_inbadlro,
|
|
tcps_ncounters,
|
|
};
|
|
|
|
extern struct cpumem *tcpcounters;
|
|
|
|
static inline void
|
|
tcpstat_inc(enum tcpstat_counters c)
|
|
{
|
|
counters_inc(tcpcounters, c);
|
|
}
|
|
|
|
static inline void
|
|
tcpstat_add(enum tcpstat_counters c, uint64_t v)
|
|
{
|
|
counters_add(tcpcounters, c, v);
|
|
}
|
|
|
|
static inline void
|
|
tcpstat_pkt(enum tcpstat_counters pcounter, enum tcpstat_counters bcounter,
|
|
uint64_t v)
|
|
{
|
|
counters_pkt(tcpcounters, pcounter, bcounter, v);
|
|
}
|
|
|
|
extern uint64_t tcp_starttime;
|
|
|
|
static inline uint64_t
|
|
tcp_now(void)
|
|
{
|
|
/* TCP time ticks in 63 bit milliseconds with 63 bit random offset. */
|
|
return tcp_starttime + (getnsecruntime() / 1000000ULL);
|
|
}
|
|
|
|
#define TCP_TIME(_sec) ((_sec) * 1000) /* tcp_now() is in milliseconds */
|
|
|
|
extern struct mutex tcp_timer_mtx;
|
|
extern const struct pr_usrreqs tcp_usrreqs;
|
|
|
|
#ifdef INET6
|
|
extern const struct pr_usrreqs tcp6_usrreqs;
|
|
#endif
|
|
|
|
extern struct pool tcpcb_pool;
|
|
extern struct inpcbtable tcbtable, tcb6table; /* queue of active tcpcb's */
|
|
extern int tcp_do_rfc1323; /* enabled/disabled? */
|
|
extern int tcptv_keep_init; /* [N] time to keep alive initial SYN packet */
|
|
extern int tcp_mssdflt; /* default maximum segment size */
|
|
extern int tcp_rst_ppslim; /* maximum outgoing RST packet per second */
|
|
extern int tcp_ack_on_push; /* ACK immediately on PUSH */
|
|
extern int tcp_do_sack; /* SACK enabled/disabled */
|
|
extern struct pool sackhl_pool;
|
|
extern int tcp_sackhole_limit; /* max entries for tcp sack queues */
|
|
extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */
|
|
extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */
|
|
extern int tcp_do_tso; /* enable TSO for TCP output packets */
|
|
|
|
extern struct pool tcpqe_pool;
|
|
extern int tcp_reass_limit; /* max entries for tcp reass queues */
|
|
|
|
extern int tcp_syn_hash_size; /* adjustable size of the hash array */
|
|
extern int tcp_syn_cache_limit; /* max entries for compressed state engine */
|
|
extern int tcp_syn_bucket_limit;/* max entries per hash bucket */
|
|
extern int tcp_syn_use_limit; /* number of uses before reseeding hash */
|
|
extern struct syn_cache_set tcp_syn_cache[];
|
|
extern int tcp_syn_cache_active; /* active syn cache, may be 0 or 1 */
|
|
|
|
struct tdb;
|
|
|
|
void tcp_canceltimers(struct tcpcb *);
|
|
struct tcpcb *
|
|
tcp_close(struct tcpcb *);
|
|
int tcp_freeq(struct tcpcb *);
|
|
#ifdef INET6
|
|
void tcp6_ctlinput(int, struct sockaddr *, u_int, void *);
|
|
#endif
|
|
void tcp_ctlinput(int, struct sockaddr *, u_int, void *);
|
|
int tcp_ctloutput(int, struct socket *, int, int, struct mbuf *);
|
|
struct tcpcb *
|
|
tcp_dodisconnect(struct tcpcb *);
|
|
struct tcpcb *
|
|
tcp_drop(struct tcpcb *, int);
|
|
int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *,
|
|
struct mbuf *, int, struct tcp_opt_info *, u_int, uint64_t);
|
|
void tcp_init(void);
|
|
int tcp_input(struct mbuf **, int *, int, int);
|
|
int tcp_mss(struct tcpcb *, int);
|
|
void tcp_mss_update(struct tcpcb *);
|
|
u_int tcp_hdrsz(struct tcpcb *);
|
|
void tcp_mtudisc(struct inpcb *, int);
|
|
void tcp_mtudisc_increase(struct inpcb *, int);
|
|
#ifdef INET6
|
|
void tcp6_mtudisc_callback(struct sockaddr_in6 *, u_int);
|
|
#endif
|
|
struct tcpcb *
|
|
tcp_newtcpcb(struct inpcb *, int);
|
|
void tcp_notify(struct inpcb *, int);
|
|
int tcp_output(struct tcpcb *);
|
|
int tcp_chopper(struct mbuf *, struct mbuf_list *, struct ifnet *, u_int);
|
|
int tcp_if_output_tso(struct ifnet *, struct mbuf **, struct sockaddr *,
|
|
struct rtentry *, uint32_t, u_int);
|
|
void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int);
|
|
int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *);
|
|
void tcp_rscale(struct tcpcb *, u_long);
|
|
void tcp_respond(struct tcpcb *, caddr_t, struct tcphdr *, tcp_seq,
|
|
tcp_seq, int, u_int, uint64_t);
|
|
void tcp_setpersist(struct tcpcb *);
|
|
void tcp_update_sndspace(struct tcpcb *);
|
|
void tcp_update_rcvspace(struct tcpcb *);
|
|
void tcp_slowtimo(void);
|
|
struct mbuf *
|
|
tcp_template(struct tcpcb *);
|
|
#ifndef SMALL_KERNEL
|
|
void tcp_trace(short, short, struct tcpcb *, struct tcpcb *, caddr_t,
|
|
int, int);
|
|
#endif
|
|
struct tcpcb *
|
|
tcp_usrclosed(struct tcpcb *);
|
|
int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
|
|
int tcp_attach(struct socket *, int, int);
|
|
int tcp_detach(struct socket *);
|
|
int tcp_bind(struct socket *, struct mbuf *, struct proc *);
|
|
int tcp_listen(struct socket *);
|
|
int tcp_connect(struct socket *, struct mbuf *);
|
|
int tcp_accept(struct socket *, struct mbuf *);
|
|
int tcp_disconnect(struct socket *);
|
|
int tcp_shutdown(struct socket *);
|
|
void tcp_rcvd(struct socket *);
|
|
int tcp_send(struct socket *, struct mbuf *, struct mbuf *,
|
|
struct mbuf *);
|
|
void tcp_abort(struct socket *);
|
|
int tcp_sockaddr(struct socket *, struct mbuf *);
|
|
int tcp_peeraddr(struct socket *, struct mbuf *);
|
|
int tcp_sense(struct socket *, struct stat *);
|
|
int tcp_rcvoob(struct socket *, struct mbuf *, int);
|
|
int tcp_sendoob(struct socket *, struct mbuf *, struct mbuf *,
|
|
struct mbuf *);
|
|
void tcp_xmit_timer(struct tcpcb *, int32_t);
|
|
void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int);
|
|
void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq);
|
|
void tcp_del_sackholes(struct tcpcb *, struct tcphdr *);
|
|
void tcp_clean_sackreport(struct tcpcb *tp);
|
|
void tcp_sack_adjust(struct tcpcb *tp);
|
|
struct sackhole *
|
|
tcp_sack_output(struct tcpcb *tp);
|
|
#ifdef DEBUG
|
|
void tcp_print_holes(struct tcpcb *tp);
|
|
#endif
|
|
u_long tcp_seq_subtract(u_long, u_long );
|
|
#ifdef TCP_SIGNATURE
|
|
int tcp_signature_apply(caddr_t, caddr_t, unsigned int);
|
|
int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *,
|
|
int, int, char *);
|
|
#endif /* TCP_SIGNATURE */
|
|
void tcp_set_iss_tsm(struct tcpcb *);
|
|
|
|
void syn_cache_unreach(const struct sockaddr *, const struct sockaddr *,
|
|
struct tcphdr *, u_int);
|
|
void syn_cache_init(void);
|
|
void syn_cache_cleanup(struct tcpcb *);
|
|
|
|
#ifdef SMALL_KERNEL
|
|
static inline void
|
|
tcp_trace(short act, short ostate, struct tcpcb *tp, struct tcpcb *otp,
|
|
caddr_t headers, int req, int len)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* _NETINET_TCP_VAR_H_ */
|