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freebsd-skq/sys/netinet/tcp_var.h
Navdeep Parhar 7893235ff0 tcp_autorcvbuf_inc was removed in r344433. 
Discussed with:	tuexen@
Sponsored by:	Chelsio Communications
2019-03-29 21:39:47 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1982, 1986, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
* $FreeBSD$
*/
#ifndef _NETINET_TCP_VAR_H_
#define _NETINET_TCP_VAR_H_
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#ifdef _KERNEL
#include <net/vnet.h>
#include <sys/mbuf.h>
#endif
#if defined(_KERNEL) || defined(_WANT_TCPCB)
/* TCP segment queue entry */
struct tseg_qent {
TAILQ_ENTRY(tseg_qent) tqe_q;
struct mbuf *tqe_m; /* mbuf contains packet */
struct mbuf *tqe_last; /* last mbuf in chain */
tcp_seq tqe_start; /* TCP Sequence number start */
int tqe_len; /* TCP segment data length */
uint32_t tqe_flags; /* The flags from the th->th_flags */
uint32_t tqe_mbuf_cnt; /* Count of mbuf overhead */
};
TAILQ_HEAD(tsegqe_head, tseg_qent);
struct sackblk {
tcp_seq start; /* start seq no. of sack block */
tcp_seq end; /* end seq no. */
};
struct sackhole {
tcp_seq start; /* start seq no. of hole */
tcp_seq end; /* end seq no. */
tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
};
struct sackhint {
struct sackhole *nexthole;
int sack_bytes_rexmit;
tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
int ispare; /* explicit pad for 64bit alignment */
int sacked_bytes; /*
* Total sacked bytes reported by the
* receiver via sack option
*/
uint32_t _pad1[1]; /* TBD */
uint64_t _pad[1]; /* TBD */
};
#define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq)
STAILQ_HEAD(tcp_log_stailq, tcp_log_mem);
/*
* Tcp control block, one per tcp; fields:
* Organized for 64 byte cacheline efficiency based
* on common tcp_input/tcp_output processing.
*/
struct tcpcb {
/* Cache line 1 */
struct inpcb *t_inpcb; /* back pointer to internet pcb */
struct tcp_function_block *t_fb;/* TCP function call block */
void *t_fb_ptr; /* Pointer to t_fb specific data */
uint32_t t_maxseg:24, /* maximum segment size */
t_logstate:8; /* State of "black box" logging */
uint32_t t_port:16, /* Tunneling (over udp) port */
t_state:4, /* state of this connection */
t_idle_reduce : 1,
t_delayed_ack: 7, /* Delayed ack variable */
bits_spare : 4;
u_int t_flags;
tcp_seq snd_una; /* sent but unacknowledged */
tcp_seq snd_max; /* highest sequence number sent;
* used to recognize retransmits
*/
tcp_seq snd_nxt; /* send next */
tcp_seq snd_up; /* send urgent pointer */
uint32_t snd_wnd; /* send window */
uint32_t snd_cwnd; /* congestion-controlled window */
uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */
/* Cache line 2 */
u_int32_t ts_offset; /* our timestamp offset */
u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
int rcv_numsacks; /* # distinct sack blks present */
u_int t_tsomax; /* TSO total burst length limit in bytes */
u_int t_tsomaxsegcount; /* TSO maximum segment count */
u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
tcp_seq rcv_nxt; /* receive next */
tcp_seq rcv_adv; /* advertised window */
uint32_t rcv_wnd; /* receive window */
u_int t_flags2; /* More tcpcb flags storage */
int t_srtt; /* smoothed round-trip time */
int t_rttvar; /* variance in round-trip time */
u_int32_t ts_recent; /* timestamp echo data */
u_char snd_scale; /* window scaling for send window */
u_char rcv_scale; /* window scaling for recv window */
u_char snd_limited; /* segments limited transmitted */
u_char request_r_scale; /* pending window scaling */
tcp_seq last_ack_sent;
u_int t_rcvtime; /* inactivity time */
/* Cache line 3 */
tcp_seq rcv_up; /* receive urgent pointer */
int t_segqlen; /* segment reassembly queue length */
uint32_t t_segqmbuflen; /* Count of bytes mbufs on all entries */
struct tsegqe_head t_segq; /* segment reassembly queue */
struct mbuf *t_in_pkt;
struct mbuf *t_tail_pkt;
struct tcp_timer *t_timers; /* All the TCP timers in one struct */
struct vnet *t_vnet; /* back pointer to parent vnet */
uint32_t snd_ssthresh; /* snd_cwnd size threshold for
* for slow start exponential to
* linear switch
*/
tcp_seq snd_wl1; /* window update seg seq number */
/* Cache line 4 */
tcp_seq snd_wl2; /* window update seg ack number */
tcp_seq irs; /* initial receive sequence number */
tcp_seq iss; /* initial send sequence number */
u_int t_acktime;
u_int ts_recent_age; /* when last updated */
tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
uint16_t cl4_spare; /* Spare to adjust CL 4 */
char t_oobflags; /* have some */
char t_iobc; /* input character */
int t_rxtcur; /* current retransmit value (ticks) */
int t_rxtshift; /* log(2) of rexmt exp. backoff */
u_int t_rtttime; /* RTT measurement start time */
tcp_seq t_rtseq; /* sequence number being timed */
u_int t_starttime; /* time connection was established */
u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
u_int t_rttmin; /* minimum rtt allowed */
u_int t_rttbest; /* best rtt we've seen */
int t_softerror; /* possible error not yet reported */
uint32_t max_sndwnd; /* largest window peer has offered */
/* Cache line 5 */
uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */
uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */
tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
int t_sndzerowin; /* zero-window updates sent */
u_long t_rttupdated; /* number of times rtt sampled */
int snd_numholes; /* number of holes seen by sender */
u_int t_badrxtwin; /* window for retransmit recovery */
TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
/* SACK scoreboard (sorted) */
tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
tcp_seq sack_newdata; /* New data xmitted in this recovery
episode starts at this seq number */
struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
struct sackhint sackhint; /* SACK scoreboard hint */
int t_rttlow; /* smallest observerved RTT */
int rfbuf_cnt; /* recv buffer autoscaling byte count */
struct toedev *tod; /* toedev handling this connection */
int t_sndrexmitpack; /* retransmit packets sent */
int t_rcvoopack; /* out-of-order packets received */
void *t_toe; /* TOE pcb pointer */
struct cc_algo *cc_algo; /* congestion control algorithm */
struct cc_var *ccv; /* congestion control specific vars */
struct osd *osd; /* storage for Khelp module data */
int t_bytes_acked; /* # bytes acked during current RTT */
u_int t_maxunacktime;
u_int t_keepinit; /* time to establish connection */
u_int t_keepidle; /* time before keepalive probes begin */
u_int t_keepintvl; /* interval between keepalives */
u_int t_keepcnt; /* number of keepalives before close */
int t_dupacks; /* consecutive dup acks recd */
int t_lognum; /* Number of log entries */
struct tcp_log_stailq t_logs; /* Log buffer */
struct tcp_log_id_node *t_lin;
struct tcp_log_id_bucket *t_lib;
const char *t_output_caller; /* Function that called tcp_output */
uint32_t t_logsn; /* Log "serial number" */
uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */
unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */
union {
uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN];
uint64_t server;
} t_tfo_cookie; /* TCP Fast Open cookie to send */
#ifdef TCPPCAP
struct mbufq t_inpkts; /* List of saved input packets. */
struct mbufq t_outpkts; /* List of saved output packets. */
#endif
};
#endif /* _KERNEL || _WANT_TCPCB */
#ifdef _KERNEL
struct tcptemp {
u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
struct tcphdr tt_t;
};
/*
* TODO: We yet need to brave plowing in
* to tcp_input() and the pru_usrreq() block.
* Right now these go to the old standards which
* are somewhat ok, but in the long term may
* need to be changed. If we do tackle tcp_input()
* then we need to get rid of the tcp_do_segment()
* function below.
*/
/* Flags for tcp functions */
#define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */
/*
* If defining the optional tcp_timers, in the
* tfb_tcp_timer_stop call you must use the
* callout_async_drain() function with the
* tcp_timer_discard callback. You should check
* the return of callout_async_drain() and if 0
* increment tt_draincnt. Since the timer sub-system
* does not know your callbacks you must provide a
* stop_all function that loops through and calls
* tcp_timer_stop() with each of your defined timers.
* Adding a tfb_tcp_handoff_ok function allows the socket
* option to change stacks to query you even if the
* connection is in a later stage. You return 0 to
* say you can take over and run your stack, you return
* non-zero (an error number) to say no you can't.
* If the function is undefined you can only change
* in the early states (before connect or listen).
* tfb_tcp_fb_fini is changed to add a flag to tell
* the old stack if the tcb is being destroyed or
* not. A one in the flag means the TCB is being
* destroyed, a zero indicates its transitioning to
* another stack (via socket option).
*/
struct tcp_function_block {
char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
int (*tfb_tcp_output)(struct tcpcb *);
int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *);
void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
struct socket *, struct tcpcb *,
int, int, uint8_t);
void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *,
struct socket *, struct tcpcb *,
int, int, uint8_t,
int, struct timeval *);
int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
struct inpcb *inp, struct tcpcb *tp);
/* Optional memory allocation/free routine */
int (*tfb_tcp_fb_init)(struct tcpcb *);
void (*tfb_tcp_fb_fini)(struct tcpcb *, int);
/* Optional timers, must define all if you define one */
int (*tfb_tcp_timer_stop_all)(struct tcpcb *);
void (*tfb_tcp_timer_activate)(struct tcpcb *,
uint32_t, u_int);
int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
void (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
int (*tfb_tcp_handoff_ok)(struct tcpcb *);
void (*tfb_tcp_mtu_chg)(struct tcpcb *);
volatile uint32_t tfb_refcnt;
uint32_t tfb_flags;
uint8_t tfb_id;
};
struct tcp_function {
TAILQ_ENTRY(tcp_function) tf_next;
char tf_name[TCP_FUNCTION_NAME_LEN_MAX];
struct tcp_function_block *tf_fb;
};
TAILQ_HEAD(tcp_funchead, tcp_function);
#endif /* _KERNEL */
/*
* Flags and utility macros for the t_flags field.
*/
#define TF_ACKNOW 0x000001 /* ack peer immediately */
#define TF_DELACK 0x000002 /* ack, but try to delay it */
#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
#define TF_NOOPT 0x000008 /* don't use tcp options */
#define TF_SENTFIN 0x000010 /* have sent FIN */
#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
#define TF_NOPUSH 0x001000 /* don't push */
#define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
#define TF_LASTIDLE 0x040000 /* connection was previously idle */
#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
#define TF_FORCEDATA 0x800000 /* force out a byte */
#define TF_TSO 0x1000000 /* TSO enabled on this connection */
#define TF_TOE 0x2000000 /* this connection is offloaded */
#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
#define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
#define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
#define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */
#define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
#define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
#define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
#define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
#define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
#define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
#define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
#define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
#define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
#if defined(_KERNEL) && !defined(TCP_RFC7413)
#define IS_FASTOPEN(t_flags) (false)
#else
#define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN)
#endif
#define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
/*
* Flags for the t_oobflags field.
*/
#define TCPOOB_HAVEDATA 0x01
#define TCPOOB_HADDATA 0x02
/*
* Flags for the extended TCP flags field, t_flags2
*/
#define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
#define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
#define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
#define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */
#define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */
/*
* 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_inc(int statnum);
#define KMOD_TCPSTAT_INC(name) \
kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t))
/*
* 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
extern int 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_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(int, tcp_minmss);
VNET_DECLARE(int, tcp_mssdflt);
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_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_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_minmss VNET(tcp_minmss)
#define V_tcp_mssdflt VNET(tcp_mssdflt)
#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_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);
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_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
void tcp_clean_sackreport(struct tcpcb *tp);
void tcp_sack_adjust(struct tcpcb *tp);
struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
void tcp_free_sackholes(struct tcpcb *tp);
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);
struct mbuf *
tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen,
int32_t seglimit, int32_t segsize, struct sockbuf *sb);
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_ */
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