b89af8e16d
MSS in two steps and try each candidate two times. However, if two candidates are the same (which is the case in TCP/IPv6), this candidate was tested four times. This patch ensures that each candidate actually reduced the MSS and is only tested 2 times. This reduces the time window of missclassifying a temporary outage as an MTU issue. Reviewed by: jtl MFC after: 1 week Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D24308
1036 lines
41 KiB
C
1036 lines
41 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1993, 1994, 1995
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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 8.4 (Berkeley) 5/24/95
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* $FreeBSD$
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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 <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#ifdef _KERNEL
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#include <net/vnet.h>
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#include <sys/mbuf.h>
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#endif
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#if defined(_KERNEL) || defined(_WANT_TCPCB)
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/* TCP segment queue entry */
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struct tseg_qent {
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TAILQ_ENTRY(tseg_qent) tqe_q;
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struct mbuf *tqe_m; /* mbuf contains packet */
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struct mbuf *tqe_last; /* last mbuf in chain */
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tcp_seq tqe_start; /* TCP Sequence number start */
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int tqe_len; /* TCP segment data length */
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uint32_t tqe_flags; /* The flags from the th->th_flags */
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uint32_t tqe_mbuf_cnt; /* Count of mbuf overhead */
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};
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TAILQ_HEAD(tsegqe_head, tseg_qent);
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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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tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
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TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
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};
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struct sackhint {
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struct sackhole *nexthole;
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int sack_bytes_rexmit;
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tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
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int ispare; /* explicit pad for 64bit alignment */
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int sacked_bytes; /*
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* Total sacked bytes reported by the
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* receiver via sack option
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*/
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uint32_t _pad1[1]; /* TBD */
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uint64_t _pad[1]; /* TBD */
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};
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#define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq)
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STAILQ_HEAD(tcp_log_stailq, tcp_log_mem);
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/*
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* Tcp control block, one per tcp; fields:
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* Organized for 64 byte cacheline efficiency based
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* on common tcp_input/tcp_output processing.
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*/
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struct tcpcb {
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/* Cache line 1 */
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struct inpcb *t_inpcb; /* back pointer to internet pcb */
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struct tcp_function_block *t_fb;/* TCP function call block */
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void *t_fb_ptr; /* Pointer to t_fb specific data */
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uint32_t t_maxseg:24, /* maximum segment size */
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t_logstate:8; /* State of "black box" logging */
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uint32_t t_port:16, /* Tunneling (over udp) port */
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t_state:4, /* state of this connection */
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t_idle_reduce : 1,
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t_delayed_ack: 7, /* Delayed ack variable */
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t_fin_is_rst: 1, /* Are fin's treated as resets */
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t_log_state_set: 1,
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bits_spare : 2;
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u_int t_flags;
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tcp_seq snd_una; /* sent but unacknowledged */
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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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tcp_seq snd_nxt; /* send next */
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tcp_seq snd_up; /* send urgent pointer */
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uint32_t snd_wnd; /* send window */
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uint32_t snd_cwnd; /* congestion-controlled window */
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uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */
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/* Cache line 2 */
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u_int32_t ts_offset; /* our timestamp offset */
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u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
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int rcv_numsacks; /* # distinct sack blks present */
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u_int t_tsomax; /* TSO total burst length limit in bytes */
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u_int t_tsomaxsegcount; /* TSO maximum segment count */
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u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
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tcp_seq rcv_nxt; /* receive next */
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tcp_seq rcv_adv; /* advertised window */
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uint32_t rcv_wnd; /* receive window */
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u_int t_flags2; /* More tcpcb flags storage */
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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_int32_t ts_recent; /* timestamp echo data */
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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 snd_limited; /* segments limited transmitted */
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u_char request_r_scale; /* pending window scaling */
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tcp_seq last_ack_sent;
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u_int t_rcvtime; /* inactivity time */
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/* Cache line 3 */
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tcp_seq rcv_up; /* receive urgent pointer */
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int t_segqlen; /* segment reassembly queue length */
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uint32_t t_segqmbuflen; /* Count of bytes mbufs on all entries */
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struct tsegqe_head t_segq; /* segment reassembly queue */
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struct mbuf *t_in_pkt;
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struct mbuf *t_tail_pkt;
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struct tcp_timer *t_timers; /* All the TCP timers in one struct */
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struct vnet *t_vnet; /* back pointer to parent vnet */
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uint32_t 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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tcp_seq snd_wl1; /* window update seg seq number */
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/* Cache line 4 */
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tcp_seq snd_wl2; /* window update seg ack number */
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tcp_seq irs; /* initial receive sequence number */
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tcp_seq iss; /* initial send sequence number */
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u_int t_acktime;
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u_int ts_recent_age; /* when last updated */
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tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
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uint16_t cl4_spare; /* Spare to adjust CL 4 */
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char t_oobflags; /* have some */
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char t_iobc; /* input character */
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int t_rxtcur; /* current retransmit value (ticks) */
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int t_rxtshift; /* log(2) of rexmt exp. backoff */
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u_int t_rtttime; /* RTT measurement start time */
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tcp_seq t_rtseq; /* sequence number being timed */
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u_int t_starttime; /* time connection was established */
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u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
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int t_blackhole_enter; /* when to enter blackhole detection */
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int t_blackhole_exit; /* when to exit blackhole detection */
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u_int t_rttmin; /* minimum rtt allowed */
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u_int t_rttbest; /* best rtt we've seen */
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int t_softerror; /* possible error not yet reported */
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uint32_t max_sndwnd; /* largest window peer has offered */
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/* Cache line 5 */
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uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */
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uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */
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tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
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int t_sndzerowin; /* zero-window updates sent */
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u_long t_rttupdated; /* number of times rtt sampled */
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int snd_numholes; /* number of holes seen by sender */
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u_int t_badrxtwin; /* window for retransmit recovery */
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TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
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/* SACK scoreboard (sorted) */
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tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
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struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
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struct sackhint sackhint; /* SACK scoreboard hint */
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int t_rttlow; /* smallest observerved RTT */
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int rfbuf_cnt; /* recv buffer autoscaling byte count */
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struct toedev *tod; /* toedev handling this connection */
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int t_sndrexmitpack; /* retransmit packets sent */
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int t_rcvoopack; /* out-of-order packets received */
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void *t_toe; /* TOE pcb pointer */
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struct cc_algo *cc_algo; /* congestion control algorithm */
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struct cc_var *ccv; /* congestion control specific vars */
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struct osd *osd; /* storage for Khelp module data */
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int t_bytes_acked; /* # bytes acked during current RTT */
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u_int t_maxunacktime;
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u_int t_keepinit; /* time to establish connection */
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u_int t_keepidle; /* time before keepalive probes begin */
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u_int t_keepintvl; /* interval between keepalives */
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u_int t_keepcnt; /* number of keepalives before close */
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int t_dupacks; /* consecutive dup acks recd */
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int t_lognum; /* Number of log entries */
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int t_loglimit; /* Maximum number of log entries */
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struct tcp_log_stailq t_logs; /* Log buffer */
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struct tcp_log_id_node *t_lin;
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struct tcp_log_id_bucket *t_lib;
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const char *t_output_caller; /* Function that called tcp_output */
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struct statsblob *t_stats; /* Per-connection stats */
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uint32_t t_logsn; /* Log "serial number" */
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uint32_t gput_ts; /* Time goodput measurement started */
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tcp_seq gput_seq; /* Outbound measurement seq */
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tcp_seq gput_ack; /* Inbound measurement ack */
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int32_t t_stats_gput_prev; /* XXXLAS: Prev gput measurement */
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uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */
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unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */
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union {
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uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN];
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uint64_t server;
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} t_tfo_cookie; /* TCP Fast Open cookie to send */
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#ifdef TCPPCAP
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struct mbufq t_inpkts; /* List of saved input packets. */
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struct mbufq t_outpkts; /* List of saved output packets. */
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#endif
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};
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#endif /* _KERNEL || _WANT_TCPCB */
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#ifdef _KERNEL
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struct tcptemp {
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u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
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struct tcphdr tt_t;
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};
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/* Minimum map entries limit value, if set */
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#define TCP_MIN_MAP_ENTRIES_LIMIT 128
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/*
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* TODO: We yet need to brave plowing in
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* to tcp_input() and the pru_usrreq() block.
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* Right now these go to the old standards which
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* are somewhat ok, but in the long term may
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* need to be changed. If we do tackle tcp_input()
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* then we need to get rid of the tcp_do_segment()
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* function below.
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*/
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/* Flags for tcp functions */
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#define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */
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/*
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* If defining the optional tcp_timers, in the
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* tfb_tcp_timer_stop call you must use the
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* callout_async_drain() function with the
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* tcp_timer_discard callback. You should check
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* the return of callout_async_drain() and if 0
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* increment tt_draincnt. Since the timer sub-system
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* does not know your callbacks you must provide a
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* stop_all function that loops through and calls
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* tcp_timer_stop() with each of your defined timers.
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* Adding a tfb_tcp_handoff_ok function allows the socket
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* option to change stacks to query you even if the
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* connection is in a later stage. You return 0 to
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* say you can take over and run your stack, you return
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* non-zero (an error number) to say no you can't.
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* If the function is undefined you can only change
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* in the early states (before connect or listen).
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* tfb_tcp_fb_fini is changed to add a flag to tell
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* the old stack if the tcb is being destroyed or
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* not. A one in the flag means the TCB is being
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* destroyed, a zero indicates its transitioning to
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* another stack (via socket option).
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*/
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struct tcp_function_block {
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char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
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int (*tfb_tcp_output)(struct tcpcb *);
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int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *);
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void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
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struct socket *, struct tcpcb *,
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int, int, uint8_t);
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int (*tfb_do_queued_segments)(struct socket *, struct tcpcb *, int);
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int (*tfb_do_segment_nounlock)(struct mbuf *, struct tcphdr *,
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struct socket *, struct tcpcb *,
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int, int, uint8_t,
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int, struct timeval *);
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void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *,
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struct socket *, struct tcpcb *,
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int, int, uint8_t,
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int, struct timeval *);
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int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
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struct inpcb *inp, struct tcpcb *tp);
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/* Optional memory allocation/free routine */
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int (*tfb_tcp_fb_init)(struct tcpcb *);
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void (*tfb_tcp_fb_fini)(struct tcpcb *, int);
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/* Optional timers, must define all if you define one */
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int (*tfb_tcp_timer_stop_all)(struct tcpcb *);
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void (*tfb_tcp_timer_activate)(struct tcpcb *,
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uint32_t, u_int);
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int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
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void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
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void (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
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int (*tfb_tcp_handoff_ok)(struct tcpcb *);
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void (*tfb_tcp_mtu_chg)(struct tcpcb *);
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volatile uint32_t tfb_refcnt;
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uint32_t tfb_flags;
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uint8_t tfb_id;
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};
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struct tcp_function {
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TAILQ_ENTRY(tcp_function) tf_next;
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char tf_name[TCP_FUNCTION_NAME_LEN_MAX];
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struct tcp_function_block *tf_fb;
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};
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TAILQ_HEAD(tcp_funchead, tcp_function);
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#endif /* _KERNEL */
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/*
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* Flags and utility macros for the t_flags field.
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*/
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#define TF_ACKNOW 0x00000001 /* ack peer immediately */
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#define TF_DELACK 0x00000002 /* ack, but try to delay it */
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#define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */
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#define TF_NOOPT 0x00000008 /* don't use tcp options */
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#define TF_SENTFIN 0x00000010 /* have sent FIN */
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#define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */
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#define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */
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#define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */
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#define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */
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#define TF_SACK_PERMIT 0x00000200 /* other side said I could SACK */
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#define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */
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#define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */
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#define TF_NOPUSH 0x00001000 /* don't push */
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#define TF_PREVVALID 0x00002000 /* saved values for bad rxmit valid */
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#define TF_UNUSED1 0x00004000 /* unused */
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#define TF_GPUTINPROG 0x00008000 /* Goodput measurement in progress */
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#define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */
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#define TF_LQ_OVERFLOW 0x00020000 /* listen queue overflow */
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#define TF_LASTIDLE 0x00040000 /* connection was previously idle */
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#define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */
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#define TF_FASTRECOVERY 0x00100000 /* in NewReno Fast Recovery */
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#define TF_WASFRECOVERY 0x00200000 /* was in NewReno Fast Recovery */
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#define TF_SIGNATURE 0x00400000 /* require MD5 digests (RFC2385) */
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#define TF_FORCEDATA 0x00800000 /* force out a byte */
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#define TF_TSO 0x01000000 /* TSO enabled on this connection */
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#define TF_TOE 0x02000000 /* this connection is offloaded */
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#define TF_UNUSED3 0x04000000 /* unused */
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#define TF_UNUSED4 0x08000000 /* unused */
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#define TF_UNUSED5 0x10000000 /* unused */
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#define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
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#define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
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#define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */
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#define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
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#define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
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#define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
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#define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
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#define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
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#define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
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#define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
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#define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
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#define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
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#if defined(_KERNEL) && !defined(TCP_RFC7413)
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#define IS_FASTOPEN(t_flags) (false)
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#else
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#define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN)
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#endif
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#define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
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/*
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* Flags for the t_oobflags field.
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*/
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#define TCPOOB_HAVEDATA 0x01
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#define TCPOOB_HADDATA 0x02
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/*
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* Flags for the extended TCP flags field, t_flags2
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*/
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#define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
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#define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
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#define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
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#define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */
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#define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */
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#define TF2_ECN_PERMIT 0x00000020 /* connection ECN-ready */
|
|
#define TF2_ECN_SND_CWR 0x00000040 /* ECN CWR in queue */
|
|
#define TF2_ECN_SND_ECE 0x00000080 /* ECN ECE in queue */
|
|
#define TF2_ACE_PERMIT 0x00000100 /* Accurate ECN mode */
|
|
|
|
/*
|
|
* 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 and tcp_addoptions.
|
|
* The binary order of the to_flags is relevant for packing of the
|
|
* options in tcp_addoptions.
|
|
*/
|
|
struct tcpopt {
|
|
u_int32_t to_flags; /* which options are present */
|
|
#define TOF_MSS 0x0001 /* maximum segment size */
|
|
#define TOF_SCALE 0x0002 /* window scaling */
|
|
#define TOF_SACKPERM 0x0004 /* SACK permitted */
|
|
#define TOF_TS 0x0010 /* timestamp */
|
|
#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
|
|
#define TOF_SACK 0x0080 /* Peer sent SACK option */
|
|
#define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */
|
|
#define TOF_MAXOPT 0x0200
|
|
u_int32_t to_tsval; /* new timestamp */
|
|
u_int32_t to_tsecr; /* reflected timestamp */
|
|
u_char *to_sacks; /* pointer to the first SACK blocks */
|
|
u_char *to_signature; /* pointer to the TCP-MD5 signature */
|
|
u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */
|
|
u_int16_t to_mss; /* maximum segment size */
|
|
u_int8_t to_wscale; /* window scaling */
|
|
u_int8_t to_nsacks; /* number of SACK blocks */
|
|
u_int8_t to_tfo_len; /* TFO cookie length */
|
|
u_int32_t to_spare; /* UTO */
|
|
};
|
|
|
|
/*
|
|
* Flags for tcp_dooptions.
|
|
*/
|
|
#define TO_SYN 0x01 /* parse SYN-only options */
|
|
|
|
struct hc_metrics_lite { /* must stay in sync with hc_metrics */
|
|
uint32_t rmx_mtu; /* MTU for this path */
|
|
uint32_t rmx_ssthresh; /* outbound gateway buffer limit */
|
|
uint32_t rmx_rtt; /* estimated round trip time */
|
|
uint32_t rmx_rttvar; /* estimated rtt variance */
|
|
uint32_t rmx_cwnd; /* congestion window */
|
|
uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */
|
|
uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */
|
|
};
|
|
|
|
/*
|
|
* Used by tcp_maxmtu() to communicate interface specific features
|
|
* and limits at the time of connection setup.
|
|
*/
|
|
struct tcp_ifcap {
|
|
int ifcap;
|
|
u_int tsomax;
|
|
u_int tsomaxsegcount;
|
|
u_int tsomaxsegsize;
|
|
};
|
|
|
|
#ifndef _NETINET_IN_PCB_H_
|
|
struct in_conninfo;
|
|
#endif /* _NETINET_IN_PCB_H_ */
|
|
|
|
struct tcptw {
|
|
struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
|
|
tcp_seq snd_nxt;
|
|
tcp_seq rcv_nxt;
|
|
tcp_seq iss;
|
|
tcp_seq irs;
|
|
u_short last_win; /* cached window value */
|
|
short tw_so_options; /* copy of so_options */
|
|
struct ucred *tw_cred; /* user credentials */
|
|
u_int32_t t_recent;
|
|
u_int32_t ts_offset; /* our timestamp offset */
|
|
u_int t_starttime;
|
|
int tw_time;
|
|
TAILQ_ENTRY(tcptw) tw_2msl;
|
|
void *tw_pspare; /* TCP_SIGNATURE */
|
|
u_int *tw_spare; /* TCP_SIGNATURE */
|
|
};
|
|
|
|
#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
|
|
#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
|
|
#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
|
|
|
|
/*
|
|
* 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 3 bits to the right of the binary point,
|
|
* and thus an "ALPHA" of 0.875. rttvar has 2 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; 3 bits frac. */
|
|
#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
|
|
#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 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)
|
|
|
|
/*
|
|
* TCP statistics.
|
|
* Many of these should be kept per connection,
|
|
* but that's inconvenient at the moment.
|
|
*/
|
|
struct tcpstat {
|
|
uint64_t tcps_connattempt; /* connections initiated */
|
|
uint64_t tcps_accepts; /* connections accepted */
|
|
uint64_t tcps_connects; /* connections established */
|
|
uint64_t tcps_drops; /* connections dropped */
|
|
uint64_t tcps_conndrops; /* embryonic connections dropped */
|
|
uint64_t tcps_minmssdrops; /* average minmss too low drops */
|
|
uint64_t tcps_closed; /* conn. closed (includes drops) */
|
|
uint64_t tcps_segstimed; /* segs where we tried to get rtt */
|
|
uint64_t tcps_rttupdated; /* times we succeeded */
|
|
uint64_t tcps_delack; /* delayed acks sent */
|
|
uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
|
|
uint64_t tcps_rexmttimeo; /* retransmit timeouts */
|
|
uint64_t tcps_persisttimeo; /* persist timeouts */
|
|
uint64_t tcps_keeptimeo; /* keepalive timeouts */
|
|
uint64_t tcps_keepprobe; /* keepalive probes sent */
|
|
uint64_t tcps_keepdrops; /* connections dropped in keepalive */
|
|
|
|
uint64_t tcps_sndtotal; /* total packets sent */
|
|
uint64_t tcps_sndpack; /* data packets sent */
|
|
uint64_t tcps_sndbyte; /* data bytes sent */
|
|
uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
|
|
uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
|
|
uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
|
|
uint64_t tcps_sndacks; /* ack-only packets sent */
|
|
uint64_t tcps_sndprobe; /* window probes sent */
|
|
uint64_t tcps_sndurg; /* packets sent with URG only */
|
|
uint64_t tcps_sndwinup; /* window update-only packets sent */
|
|
uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
|
|
|
|
uint64_t tcps_rcvtotal; /* total packets received */
|
|
uint64_t tcps_rcvpack; /* packets received in sequence */
|
|
uint64_t tcps_rcvbyte; /* bytes received in sequence */
|
|
uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
|
|
uint64_t tcps_rcvbadoff; /* packets received with bad offset */
|
|
uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
|
|
uint64_t tcps_rcvshort; /* packets received too short */
|
|
uint64_t tcps_rcvduppack; /* duplicate-only packets received */
|
|
uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
|
|
uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
|
|
uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
|
|
uint64_t tcps_rcvoopack; /* out-of-order packets received */
|
|
uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
|
|
uint64_t tcps_rcvpackafterwin; /* packets with data after window */
|
|
uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
|
|
uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
|
|
uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
|
|
uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
|
|
uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
|
|
uint64_t tcps_rcvackpack; /* rcvd ack packets */
|
|
uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
|
|
uint64_t tcps_rcvwinupd; /* rcvd window update packets */
|
|
uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
|
|
uint64_t tcps_predack; /* times hdr predict ok for acks */
|
|
uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
|
|
uint64_t tcps_pcbcachemiss;
|
|
uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
|
|
uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
|
|
uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
|
|
uint64_t tcps_usedrtt; /* times RTT initialized from route */
|
|
uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
|
|
uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
|
|
uint64_t tcps_persistdrop; /* timeout in persist state */
|
|
uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
|
|
uint64_t tcps_mturesent; /* resends due to MTU discovery */
|
|
uint64_t tcps_listendrop; /* listen queue overflows */
|
|
uint64_t tcps_badrst; /* ignored RSTs in the window */
|
|
|
|
uint64_t tcps_sc_added; /* entry added to syncache */
|
|
uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
|
|
uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
|
|
uint64_t tcps_sc_dropped; /* could not reply to packet */
|
|
uint64_t tcps_sc_completed; /* successful extraction of entry */
|
|
uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
|
|
uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
|
|
uint64_t tcps_sc_reset; /* RST removed entry from syncache */
|
|
uint64_t tcps_sc_stale; /* timed out or listen socket gone */
|
|
uint64_t tcps_sc_aborted; /* syncache entry aborted */
|
|
uint64_t tcps_sc_badack; /* removed due to bad ACK */
|
|
uint64_t tcps_sc_unreach; /* ICMP unreachable received */
|
|
uint64_t tcps_sc_zonefail; /* zalloc() failed */
|
|
uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
|
|
uint64_t tcps_sc_recvcookie; /* SYN cookie received */
|
|
|
|
uint64_t tcps_hc_added; /* entry added to hostcache */
|
|
uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
|
|
|
|
uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
|
|
|
|
/* SACK related stats */
|
|
uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
|
|
uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
|
|
uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
|
|
uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
|
|
uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
|
|
uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
|
|
|
|
/* ECN related stats */
|
|
uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
|
|
uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
|
|
uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
|
|
uint64_t tcps_ecn_shs; /* ECN successful handshakes */
|
|
uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
|
|
|
|
/* TCP_SIGNATURE related stats */
|
|
uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
|
|
uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
|
|
uint64_t tcps_sig_err_buildsig; /* Failed to make signature */
|
|
uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
|
|
uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
|
|
|
|
/* Path MTU Discovery Black Hole Detection related stats */
|
|
uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */
|
|
uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */
|
|
uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */
|
|
|
|
uint64_t _pad[12]; /* 6 UTO, 6 TBD */
|
|
};
|
|
|
|
#define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
|
|
|
|
#ifdef _KERNEL
|
|
#define TI_UNLOCKED 1
|
|
#define TI_RLOCKED 2
|
|
#include <sys/counter.h>
|
|
|
|
VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
|
|
/*
|
|
* In-kernel consumers can use these accessor macros directly to update
|
|
* stats.
|
|
*/
|
|
#define TCPSTAT_ADD(name, val) \
|
|
VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
|
|
#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
|
|
|
|
/*
|
|
* Kernel module consumers must use this accessor macro.
|
|
*/
|
|
void kmod_tcpstat_add(int statnum, int val);
|
|
#define KMOD_TCPSTAT_ADD(name, val) \
|
|
kmod_tcpstat_add(offsetof(struct tcpstat, name) / sizeof(uint64_t), val)
|
|
#define KMOD_TCPSTAT_INC(name) KMOD_TCPSTAT_ADD(name, 1)
|
|
|
|
/*
|
|
* Running TCP connection count by state.
|
|
*/
|
|
VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]);
|
|
#define V_tcps_states VNET(tcps_states)
|
|
#define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1)
|
|
#define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1)
|
|
|
|
/*
|
|
* TCP specific helper hook point identifiers.
|
|
*/
|
|
#define HHOOK_TCP_EST_IN 0
|
|
#define HHOOK_TCP_EST_OUT 1
|
|
#define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
|
|
|
|
struct tcp_hhook_data {
|
|
struct tcpcb *tp;
|
|
struct tcphdr *th;
|
|
struct tcpopt *to;
|
|
uint32_t len;
|
|
int tso;
|
|
tcp_seq curack;
|
|
};
|
|
#ifdef TCP_HHOOK
|
|
void hhook_run_tcp_est_out(struct tcpcb *tp,
|
|
struct tcphdr *th, struct tcpopt *to,
|
|
uint32_t len, int tso);
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* TCB structure exported to user-land via sysctl(3).
|
|
*
|
|
* Fields prefixed with "xt_" are unique to the export structure, and fields
|
|
* with "t_" or other prefixes match corresponding fields of 'struct tcpcb'.
|
|
*
|
|
* Legend:
|
|
* (s) - used by userland utilities in src
|
|
* (p) - used by utilities in ports
|
|
* (3) - is known to be used by third party software not in ports
|
|
* (n) - no known usage
|
|
*
|
|
* Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
|
|
* included. Not all of our clients do.
|
|
*/
|
|
#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
|
|
struct xtcpcb {
|
|
ksize_t xt_len; /* length of this structure */
|
|
struct xinpcb xt_inp;
|
|
char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */
|
|
char xt_logid[TCP_LOG_ID_LEN]; /* (s) */
|
|
int64_t spare64[8];
|
|
int32_t t_state; /* (s,p) */
|
|
uint32_t t_flags; /* (s,p) */
|
|
int32_t t_sndzerowin; /* (s) */
|
|
int32_t t_sndrexmitpack; /* (s) */
|
|
int32_t t_rcvoopack; /* (s) */
|
|
int32_t t_rcvtime; /* (s) */
|
|
int32_t tt_rexmt; /* (s) */
|
|
int32_t tt_persist; /* (s) */
|
|
int32_t tt_keep; /* (s) */
|
|
int32_t tt_2msl; /* (s) */
|
|
int32_t tt_delack; /* (s) */
|
|
int32_t t_logstate; /* (3) */
|
|
int32_t spare32[32];
|
|
} __aligned(8);
|
|
|
|
#ifdef _KERNEL
|
|
void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *);
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* TCP function information (name-to-id mapping, aliases, and refcnt)
|
|
* exported to user-land via sysctl(3).
|
|
*/
|
|
struct tcp_function_info {
|
|
uint32_t tfi_refcnt;
|
|
uint8_t tfi_id;
|
|
char tfi_name[TCP_FUNCTION_NAME_LEN_MAX];
|
|
char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX];
|
|
};
|
|
|
|
/*
|
|
* Identifiers for TCP sysctl nodes
|
|
*/
|
|
#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
|
|
#define TCPCTL_MSSDFLT 3 /* MSS default */
|
|
#define TCPCTL_STATS 4 /* statistics */
|
|
#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_SACK 14 /* Selective Acknowledgement,rfc 2018 */
|
|
#define TCPCTL_DROP 15 /* drop tcp connection */
|
|
#define TCPCTL_STATES 16 /* connection counts by TCP state */
|
|
|
|
#ifdef _KERNEL
|
|
#ifdef SYSCTL_DECL
|
|
SYSCTL_DECL(_net_inet_tcp);
|
|
SYSCTL_DECL(_net_inet_tcp_sack);
|
|
MALLOC_DECLARE(M_TCPLOG);
|
|
#endif
|
|
|
|
VNET_DECLARE(int, tcp_log_in_vain);
|
|
#define V_tcp_log_in_vain VNET(tcp_log_in_vain)
|
|
|
|
/*
|
|
* Global TCP tunables shared between different stacks.
|
|
* Please keep the list sorted.
|
|
*/
|
|
VNET_DECLARE(int, drop_synfin);
|
|
VNET_DECLARE(int, path_mtu_discovery);
|
|
VNET_DECLARE(int, tcp_abc_l_var);
|
|
VNET_DECLARE(int, tcp_autorcvbuf_max);
|
|
VNET_DECLARE(int, tcp_autosndbuf_inc);
|
|
VNET_DECLARE(int, tcp_autosndbuf_max);
|
|
VNET_DECLARE(int, tcp_delack_enabled);
|
|
VNET_DECLARE(int, tcp_do_autorcvbuf);
|
|
VNET_DECLARE(int, tcp_do_autosndbuf);
|
|
VNET_DECLARE(int, tcp_do_ecn);
|
|
VNET_DECLARE(int, tcp_do_newcwv);
|
|
VNET_DECLARE(int, tcp_do_rfc1323);
|
|
VNET_DECLARE(int, tcp_do_rfc3042);
|
|
VNET_DECLARE(int, tcp_do_rfc3390);
|
|
VNET_DECLARE(int, tcp_do_rfc3465);
|
|
VNET_DECLARE(int, tcp_do_rfc6675_pipe);
|
|
VNET_DECLARE(int, tcp_do_sack);
|
|
VNET_DECLARE(int, tcp_do_tso);
|
|
VNET_DECLARE(int, tcp_ecn_maxretries);
|
|
VNET_DECLARE(int, tcp_initcwnd_segments);
|
|
VNET_DECLARE(int, tcp_insecure_rst);
|
|
VNET_DECLARE(int, tcp_insecure_syn);
|
|
VNET_DECLARE(uint32_t, tcp_map_entries_limit);
|
|
VNET_DECLARE(uint32_t, tcp_map_split_limit);
|
|
VNET_DECLARE(int, tcp_minmss);
|
|
VNET_DECLARE(int, tcp_mssdflt);
|
|
#ifdef STATS
|
|
VNET_DECLARE(int, tcp_perconn_stats_dflt_tpl);
|
|
VNET_DECLARE(int, tcp_perconn_stats_enable);
|
|
#endif /* STATS */
|
|
VNET_DECLARE(int, tcp_recvspace);
|
|
VNET_DECLARE(int, tcp_sack_globalholes);
|
|
VNET_DECLARE(int, tcp_sack_globalmaxholes);
|
|
VNET_DECLARE(int, tcp_sack_maxholes);
|
|
VNET_DECLARE(int, tcp_sc_rst_sock_fail);
|
|
VNET_DECLARE(int, tcp_sendspace);
|
|
VNET_DECLARE(struct inpcbhead, tcb);
|
|
VNET_DECLARE(struct inpcbinfo, tcbinfo);
|
|
|
|
#define V_tcp_do_newcwv VNET(tcp_do_newcwv)
|
|
#define V_drop_synfin VNET(drop_synfin)
|
|
#define V_path_mtu_discovery VNET(path_mtu_discovery)
|
|
#define V_tcb VNET(tcb)
|
|
#define V_tcbinfo VNET(tcbinfo)
|
|
#define V_tcp_abc_l_var VNET(tcp_abc_l_var)
|
|
#define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max)
|
|
#define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc)
|
|
#define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max)
|
|
#define V_tcp_delack_enabled VNET(tcp_delack_enabled)
|
|
#define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf)
|
|
#define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf)
|
|
#define V_tcp_do_ecn VNET(tcp_do_ecn)
|
|
#define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
|
|
#define V_tcp_ts_offset_per_conn VNET(tcp_ts_offset_per_conn)
|
|
#define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042)
|
|
#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
|
|
#define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
|
|
#define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe)
|
|
#define V_tcp_do_sack VNET(tcp_do_sack)
|
|
#define V_tcp_do_tso VNET(tcp_do_tso)
|
|
#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
|
|
#define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
|
|
#define V_tcp_insecure_rst VNET(tcp_insecure_rst)
|
|
#define V_tcp_insecure_syn VNET(tcp_insecure_syn)
|
|
#define V_tcp_map_entries_limit VNET(tcp_map_entries_limit)
|
|
#define V_tcp_map_split_limit VNET(tcp_map_split_limit)
|
|
#define V_tcp_minmss VNET(tcp_minmss)
|
|
#define V_tcp_mssdflt VNET(tcp_mssdflt)
|
|
#ifdef STATS
|
|
#define V_tcp_perconn_stats_dflt_tpl VNET(tcp_perconn_stats_dflt_tpl)
|
|
#define V_tcp_perconn_stats_enable VNET(tcp_perconn_stats_enable)
|
|
#endif /* STATS */
|
|
#define V_tcp_recvspace VNET(tcp_recvspace)
|
|
#define V_tcp_sack_globalholes VNET(tcp_sack_globalholes)
|
|
#define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes)
|
|
#define V_tcp_sack_maxholes VNET(tcp_sack_maxholes)
|
|
#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
|
|
#define V_tcp_sendspace VNET(tcp_sendspace)
|
|
#define V_tcp_udp_tunneling_overhead VNET(tcp_udp_tunneling_overhead)
|
|
#define V_tcp_udp_tunneling_port VNET(tcp_udp_tunneling_port)
|
|
|
|
#ifdef TCP_HHOOK
|
|
VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
|
|
#define V_tcp_hhh VNET(tcp_hhh)
|
|
#endif
|
|
|
|
int tcp_addoptions(struct tcpopt *, u_char *);
|
|
int tcp_ccalgounload(struct cc_algo *unload_algo);
|
|
struct tcpcb *
|
|
tcp_close(struct tcpcb *);
|
|
void tcp_discardcb(struct tcpcb *);
|
|
void tcp_twstart(struct tcpcb *);
|
|
void tcp_twclose(struct tcptw *, int);
|
|
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_init(void);
|
|
void tcp_fini(void *);
|
|
char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
|
|
const void *);
|
|
char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
|
|
const void *);
|
|
int tcp_reass(struct tcpcb *, struct tcphdr *, tcp_seq *, int *, struct mbuf *);
|
|
void tcp_reass_global_init(void);
|
|
void tcp_reass_flush(struct tcpcb *);
|
|
void tcp_dooptions(struct tcpopt *, u_char *, int, int);
|
|
void tcp_dropwithreset(struct mbuf *, struct tcphdr *,
|
|
struct tcpcb *, int, int);
|
|
void tcp_pulloutofband(struct socket *,
|
|
struct tcphdr *, struct mbuf *, int);
|
|
void tcp_xmit_timer(struct tcpcb *, int);
|
|
void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
|
|
void cc_ack_received(struct tcpcb *tp, struct tcphdr *th,
|
|
uint16_t nsegs, uint16_t type);
|
|
void cc_conn_init(struct tcpcb *tp);
|
|
void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
|
|
void cc_ecnpkt_handler(struct tcpcb *tp, struct tcphdr *th, uint8_t iptos);
|
|
void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
|
|
#ifdef TCP_HHOOK
|
|
void hhook_run_tcp_est_in(struct tcpcb *tp,
|
|
struct tcphdr *th, struct tcpopt *to);
|
|
#endif
|
|
|
|
int tcp_input(struct mbuf **, int *, int);
|
|
int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *,
|
|
struct tcpcb *, int);
|
|
void tcp_do_segment(struct mbuf *, struct tcphdr *,
|
|
struct socket *, struct tcpcb *, int, int, uint8_t);
|
|
|
|
int register_tcp_functions(struct tcp_function_block *blk, int wait);
|
|
int register_tcp_functions_as_names(struct tcp_function_block *blk,
|
|
int wait, const char *names[], int *num_names);
|
|
int register_tcp_functions_as_name(struct tcp_function_block *blk,
|
|
const char *name, int wait);
|
|
int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,
|
|
bool force);
|
|
struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs);
|
|
void tcp_switch_back_to_default(struct tcpcb *tp);
|
|
struct tcp_function_block *
|
|
find_and_ref_tcp_fb(struct tcp_function_block *fs);
|
|
int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp);
|
|
|
|
extern counter_u64_t tcp_inp_lro_direct_queue;
|
|
extern counter_u64_t tcp_inp_lro_wokeup_queue;
|
|
extern counter_u64_t tcp_inp_lro_compressed;
|
|
extern counter_u64_t tcp_inp_lro_single_push;
|
|
extern counter_u64_t tcp_inp_lro_locks_taken;
|
|
extern counter_u64_t tcp_inp_lro_sack_wake;
|
|
|
|
#ifdef NETFLIX_EXP_DETECTION
|
|
/* Various SACK attack thresholds */
|
|
extern int32_t tcp_force_detection;
|
|
extern int32_t tcp_sack_to_ack_thresh;
|
|
extern int32_t tcp_sack_to_move_thresh;
|
|
extern int32_t tcp_restoral_thresh;
|
|
extern int32_t tcp_sad_decay_val;
|
|
extern int32_t tcp_sad_pacing_interval;
|
|
extern int32_t tcp_sad_low_pps;
|
|
extern int32_t tcp_map_minimum;
|
|
extern int32_t tcp_attack_on_turns_on_logging;
|
|
#endif
|
|
|
|
uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
|
|
uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
|
|
u_int tcp_maxseg(const struct tcpcb *);
|
|
void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
|
|
struct tcp_ifcap *);
|
|
void tcp_mss(struct tcpcb *, int);
|
|
int tcp_mssopt(struct in_conninfo *);
|
|
struct inpcb *
|
|
tcp_drop_syn_sent(struct inpcb *, int);
|
|
struct tcpcb *
|
|
tcp_newtcpcb(struct inpcb *);
|
|
int tcp_output(struct tcpcb *);
|
|
void tcp_state_change(struct tcpcb *, int);
|
|
void tcp_respond(struct tcpcb *, void *,
|
|
struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
|
|
void tcp_tw_init(void);
|
|
#ifdef VIMAGE
|
|
void tcp_tw_destroy(void);
|
|
#endif
|
|
void tcp_tw_zone_change(void);
|
|
int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
|
|
struct mbuf *, int);
|
|
void tcp_setpersist(struct tcpcb *);
|
|
void tcp_slowtimo(void);
|
|
struct tcptemp *
|
|
tcpip_maketemplate(struct inpcb *);
|
|
void tcpip_fillheaders(struct inpcb *, void *, void *);
|
|
void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
|
|
int tcp_timer_suspend(struct tcpcb *, uint32_t);
|
|
void tcp_timers_unsuspend(struct tcpcb *, uint32_t);
|
|
int tcp_timer_active(struct tcpcb *, uint32_t);
|
|
void tcp_timer_stop(struct tcpcb *, uint32_t);
|
|
void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
|
|
int inp_to_cpuid(struct inpcb *inp);
|
|
/*
|
|
* All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
|
|
*/
|
|
void tcp_hc_init(void);
|
|
#ifdef VIMAGE
|
|
void tcp_hc_destroy(void);
|
|
#endif
|
|
void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
|
|
uint32_t tcp_hc_getmtu(struct in_conninfo *);
|
|
void tcp_hc_updatemtu(struct in_conninfo *, uint32_t);
|
|
void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
|
|
|
|
extern struct pr_usrreqs tcp_usrreqs;
|
|
|
|
uint32_t tcp_new_ts_offset(struct in_conninfo *);
|
|
tcp_seq tcp_new_isn(struct in_conninfo *);
|
|
|
|
int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
|
|
void tcp_update_dsack_list(struct tcpcb *, tcp_seq, tcp_seq);
|
|
void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
|
|
void tcp_clean_dsack_blocks(struct tcpcb *tp);
|
|
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);
|
|
int tcp_newreno(struct tcpcb *, struct tcphdr *);
|
|
int tcp_compute_pipe(struct tcpcb *);
|
|
uint32_t tcp_compute_initwnd(uint32_t);
|
|
void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t);
|
|
int tcp_stats_sample_rollthedice(struct tcpcb *tp, void *seed_bytes,
|
|
size_t seed_len);
|
|
struct mbuf *
|
|
tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen,
|
|
int32_t seglimit, int32_t segsize, struct sockbuf *sb, bool hw_tls);
|
|
|
|
int tcp_stats_init(void);
|
|
|
|
static inline void
|
|
tcp_fields_to_host(struct tcphdr *th)
|
|
{
|
|
|
|
th->th_seq = ntohl(th->th_seq);
|
|
th->th_ack = ntohl(th->th_ack);
|
|
th->th_win = ntohs(th->th_win);
|
|
th->th_urp = ntohs(th->th_urp);
|
|
}
|
|
|
|
static inline void
|
|
tcp_fields_to_net(struct tcphdr *th)
|
|
{
|
|
|
|
th->th_seq = htonl(th->th_seq);
|
|
th->th_ack = htonl(th->th_ack);
|
|
th->th_win = htons(th->th_win);
|
|
th->th_urp = htons(th->th_urp);
|
|
}
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* _NETINET_TCP_VAR_H_ */
|