/* $NetBSD: tcp_var.h,v 1.114 2004/12/15 04:25:20 thorpej Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * 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 project 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 PROJECT 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 PROJECT 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. */ /* * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 * * NRL grants permission for redistribution and use in source and binary * forms, with or without modification, of the software and documentation * created at NRL provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgements: * This product includes software developed by the University of * California, Berkeley and its contributors. * This product includes software developed at the Information * Technology Division, US Naval Research Laboratory. * 4. Neither the name of the NRL nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL 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 NRL 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. * * The views and conclusions contained in the software and documentation * are those of the authors and should not be interpreted as representing * official policies, either expressed or implied, of the US Naval * Research Laboratory (NRL). */ /*- * Copyright (c) 1997, 1998, 1999, 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * 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 */ #ifndef _NETINET_TCP_VAR_H_ #define _NETINET_TCP_VAR_H_ #if defined(_KERNEL_OPT) #include "opt_inet.h" #include "opt_mbuftrace.h" #endif /* * Kernel variables for tcp. */ #include #ifdef TCP_SIGNATURE /* * Defines which are needed by the xform_tcp module and tcp_[in|out]put * for SADB verification and lookup. */ #define TCP_SIGLEN 16 /* length of computed digest in bytes */ #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ /* * Only a single SA per host may be specified at this time. An SPI is * needed in order for the KEY_ALLOCSA() lookup to work. */ #define TCP_SIG_SPI 0x1000 #endif /* TCP_SIGNATURE */ /* * Tcp control block, one per tcp; fields: */ struct tcpcb { int t_family; /* address family on the wire */ struct ipqehead segq; /* sequencing queue */ struct callout t_timer[TCPT_NTIMERS];/* tcp timers */ short t_state; /* state of this connection */ short t_rxtshift; /* log(2) of rexmt exp. backoff */ uint32_t t_rxtcur; /* current retransmit value */ short t_dupacks; /* consecutive dup acks recd */ u_short t_peermss; /* peer's maximum segment size */ u_short t_ourmss; /* our's maximum segment size */ u_short t_segsz; /* current segment size in use */ char t_force; /* 1 if forcing out a byte */ u_int t_flags; #define TF_ACKNOW 0x0001 /* ack peer immediately */ #define TF_DELACK 0x0002 /* ack, but try to delay it */ #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ #define TF_NOOPT 0x0008 /* don't use tcp options */ #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ #define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */ #define TF_WILL_SACK 0x0800 /* try to use SACK */ #define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */ #define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */ #define TF_REASSEMBLING 0x4000 /* we're busy reassembling */ #define TF_DEAD 0x8000 /* dead and to-be-released */ #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ struct mbuf *t_template; /* skeletal packet for transmit */ struct inpcb *t_inpcb; /* back pointer to internet pcb */ struct in6pcb *t_in6pcb; /* back pointer to internet pcb */ struct callout t_delack_ch; /* delayed ACK callout */ /* * The following fields are used as in the protocol specification. * See RFC783, Dec. 1981, page 21. */ /* send sequence variables */ tcp_seq snd_una; /* send unacknowledged */ tcp_seq snd_nxt; /* send next */ tcp_seq snd_up; /* send urgent pointer */ tcp_seq snd_wl1; /* window update seg seq number */ tcp_seq snd_wl2; /* window update seg ack number */ tcp_seq iss; /* initial send sequence number */ u_long snd_wnd; /* send window */ tcp_seq snd_recover; /* for use in fast recovery */ /* receive sequence variables */ u_long rcv_wnd; /* receive window */ tcp_seq rcv_nxt; /* receive next */ tcp_seq rcv_up; /* receive urgent pointer */ tcp_seq irs; /* initial receive sequence number */ /* * Additional variables for this implementation. */ /* receive variables */ tcp_seq rcv_adv; /* advertised window */ /* retransmit variables */ tcp_seq snd_max; /* highest sequence number sent; * used to recognize retransmits */ /* congestion control (for slow start, source quench, retransmit after loss) */ u_long snd_cwnd; /* congestion-controlled window */ u_long snd_ssthresh; /* snd_cwnd size threshhold for * for slow start exponential to * linear switch */ /* * transmit timing stuff. See below for scale of srtt and rttvar. * "Variance" is actually smoothed difference. */ uint32_t t_rcvtime; /* time last segment received */ uint32_t t_rtttime; /* time we started measuring rtt */ tcp_seq t_rtseq; /* sequence number being timed */ int32_t t_srtt; /* smoothed round-trip time */ int32_t t_rttvar; /* variance in round-trip time */ uint32_t t_rttmin; /* minimum rtt allowed */ u_long max_sndwnd; /* largest window peer has offered */ /* out-of-band data */ char t_oobflags; /* have some */ char t_iobc; /* input character */ #define TCPOOB_HAVEDATA 0x01 #define TCPOOB_HADDATA 0x02 short t_softerror; /* possible error not yet reported */ /* RFC 1323 variables */ u_char snd_scale; /* window scaling for send window */ u_char rcv_scale; /* window scaling for recv window */ u_char request_r_scale; /* pending window scaling */ u_char requested_s_scale; u_int32_t ts_recent; /* timestamp echo data */ u_int32_t ts_recent_age; /* when last updated */ u_int32_t ts_timebase; /* our timebase */ tcp_seq last_ack_sent; /* SACK stuff */ struct ipqehead timeq; /* time sequenced queue (for SACK) */ /* path MTU discovery blackhole detection */ int t_mtudisc; /* perform mtudisc for this tcb */ /* pointer for syn cache entries*/ LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ /* prediction of next mbuf when using large window sizes */ struct mbuf *t_lastm; /* last mbuf that data was sent from */ int t_inoff; /* data offset in previous mbuf */ int t_lastoff; /* last data address in mbuf chain */ int t_lastlen; /* last length read from mbuf chain */ }; #ifdef _KERNEL /* * TCP reassembly queue locks. */ static __inline int tcp_reass_lock_try (struct tcpcb *) __attribute__((__unused__)); static __inline void tcp_reass_unlock (struct tcpcb *) __attribute__((__unused__)); static __inline int tcp_reass_lock_try(tp) struct tcpcb *tp; { int s; /* * Use splvm() -- we're blocking things that would cause * mbuf allocation. */ s = splvm(); if (tp->t_flags & TF_REASSEMBLING) { splx(s); return (0); } tp->t_flags |= TF_REASSEMBLING; splx(s); return (1); } static __inline void tcp_reass_unlock(tp) struct tcpcb *tp; { int s; s = splvm(); tp->t_flags &= ~TF_REASSEMBLING; splx(s); } #ifdef DIAGNOSTIC #define TCP_REASS_LOCK(tp) \ do { \ if (tcp_reass_lock_try(tp) == 0) { \ printf("%s:%d: tcpcb %p reass already locked\n", \ __FILE__, __LINE__, tp); \ panic("tcp_reass_lock"); \ } \ } while (/*CONSTCOND*/ 0) #define TCP_REASS_LOCK_CHECK(tp) \ do { \ if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \ printf("%s:%d: tcpcb %p reass lock not held\n", \ __FILE__, __LINE__, tp); \ panic("tcp reass lock check"); \ } \ } while (/*CONSTCOND*/ 0) #else #define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp)) #define TCP_REASS_LOCK_CHECK(tp) /* nothing */ #endif #define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp)) #endif /* _KERNEL */ /* * Queue for delayed ACK processing. */ #ifdef _KERNEL extern int tcp_delack_ticks; void tcp_delack(void *); #define TCP_RESTART_DELACK(tp) \ callout_reset(&(tp)->t_delack_ch, tcp_delack_ticks, \ tcp_delack, tp) #define TCP_SET_DELACK(tp) \ do { \ if (((tp)->t_flags & TF_DELACK) == 0) { \ (tp)->t_flags |= TF_DELACK; \ TCP_RESTART_DELACK(tp); \ } \ } while (/*CONSTCOND*/0) #define TCP_CLEAR_DELACK(tp) \ do { \ if ((tp)->t_flags & TF_DELACK) { \ (tp)->t_flags &= ~TF_DELACK; \ callout_stop(&(tp)->t_delack_ch); \ } \ } while (/*CONSTCOND*/0) #endif /* _KERNEL */ /* * Compute the current timestamp for a connection. */ #define TCP_TIMESTAMP(tp) (tcp_now - (tp)->ts_timebase) /* * Handy way of passing around TCP option info. */ struct tcp_opt_info { int ts_present; u_int32_t ts_val; u_int32_t ts_ecr; u_int16_t maxseg; }; #define TOF_SIGNATURE 0x0040 /* signature option present */ #define TOF_SIGLEN 0x0080 /* sigature length valid (RFC2385) */ /* * Data for the TCP compressed state engine. */ union syn_cache_sa { struct sockaddr sa; struct sockaddr_in sin; #if 1 /*def INET6*/ struct sockaddr_in6 sin6; #endif }; struct syn_cache { TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ struct callout sc_timer; /* rexmt timer */ union { /* cached route */ struct route route4; #ifdef INET6 struct route_in6 route6; #endif } sc_route_u; #define sc_route4 sc_route_u.route4 #ifdef INET6 #define sc_route6 sc_route_u.route6 #endif long sc_win; /* advertised window */ int sc_bucketidx; /* our bucket index */ u_int32_t sc_hash; u_int32_t sc_timestamp; /* timestamp from SYN */ u_int32_t sc_timebase; /* our local timebase */ union syn_cache_sa sc_src; union syn_cache_sa sc_dst; tcp_seq sc_irs; tcp_seq sc_iss; u_int sc_rxtcur; /* current rxt timeout */ u_int sc_rxttot; /* total time spend on queues */ u_short sc_rxtshift; /* for computing backoff */ u_short sc_flags; #define SCF_UNREACH 0x0001 /* we've had an unreach error */ #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ #define SCF_DEAD 0x0004 /* this entry to be released */ #define SCF_SIGNATURE 0x40 /* send MD5 digests */ struct mbuf *sc_ipopts; /* IP options */ u_int16_t sc_peermaxseg; u_int16_t sc_ourmaxseg; u_int8_t sc_request_r_scale : 4, sc_requested_s_scale : 4; struct tcpcb *sc_tp; /* tcb for listening socket */ LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ }; struct syn_cache_head { TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */ u_short sch_length; /* # entries in bucket */ }; #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) #ifdef INET6 #define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb) #endif #ifndef INET6 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) #else #define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \ ? intotcpcb(sotoinpcb(so)) \ : in6totcpcb(sotoin6pcb(so))) #endif /* * 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_SHIFT 3 /* shift for srtt; 3 bits frac. */ #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ /* * 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 macro assumes that the value of 1<t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) /* * Compute the initial window for slow start. */ #define TCP_INITIAL_WINDOW(iw, segsz) \ (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \ ((segsz) * (iw))) /* * TCP statistics. * Many of these should be kept per connection, * but that's inconvenient at the moment. */ struct tcpstat { u_quad_t tcps_connattempt; /* connections initiated */ u_quad_t tcps_accepts; /* connections accepted */ u_quad_t tcps_connects; /* connections established */ u_quad_t tcps_drops; /* connections dropped */ u_quad_t tcps_conndrops; /* embryonic connections dropped */ u_quad_t tcps_closed; /* conn. closed (includes drops) */ u_quad_t tcps_segstimed; /* segs where we tried to get rtt */ u_quad_t tcps_rttupdated; /* times we succeeded */ u_quad_t tcps_delack; /* delayed acks sent */ u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ u_quad_t tcps_rexmttimeo; /* retransmit timeouts */ u_quad_t tcps_persisttimeo; /* persist timeouts */ u_quad_t tcps_keeptimeo; /* keepalive timeouts */ u_quad_t tcps_keepprobe; /* keepalive probes sent */ u_quad_t tcps_keepdrops; /* connections dropped in keepalive */ u_quad_t tcps_persistdrops; /* connections dropped in persist */ u_quad_t tcps_connsdrained; /* connections drained due to memory shortage */ u_quad_t tcps_pmtublackhole; /* PMTUD blackhole detected */ u_quad_t tcps_sndtotal; /* total packets sent */ u_quad_t tcps_sndpack; /* data packets sent */ u_quad_t tcps_sndbyte; /* data bytes sent */ u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */ u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */ u_quad_t tcps_sndacks; /* ack-only packets sent */ u_quad_t tcps_sndprobe; /* window probes sent */ u_quad_t tcps_sndurg; /* packets sent with URG only */ u_quad_t tcps_sndwinup; /* window update-only packets sent */ u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ u_quad_t tcps_rcvtotal; /* total packets received */ u_quad_t tcps_rcvpack; /* packets received in sequence */ u_quad_t tcps_rcvbyte; /* bytes received in sequence */ u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */ u_quad_t tcps_rcvbadoff; /* packets received with bad offset */ u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ u_quad_t tcps_rcvshort; /* packets received too short */ u_quad_t tcps_rcvduppack; /* duplicate-only packets received */ u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */ u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */ u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ u_quad_t tcps_rcvoopack; /* out-of-order packets received */ u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */ u_quad_t tcps_rcvpackafterwin; /* packets with data after window */ u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */ u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */ u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */ u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ u_quad_t tcps_rcvackpack; /* rcvd ack packets */ u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ u_quad_t tcps_rcvwinupd; /* rcvd window update packets */ u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */ u_quad_t tcps_predack; /* times hdr predict ok for acks */ u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */ u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */ u_quad_t tcps_noport; /* no socket on port */ u_quad_t tcps_badsyn; /* received ack for which we have no SYN in compressed state */ u_quad_t tcps_delayed_free; /* delayed pool_put() of tcpcb */ /* These statistics deal with the SYN cache. */ u_quad_t tcps_sc_added; /* # of entries added */ u_quad_t tcps_sc_completed; /* # of connections completed */ u_quad_t tcps_sc_timed_out; /* # of entries timed out */ u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */ u_quad_t tcps_sc_reset; /* # dropped due to RST */ u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */ u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ u_quad_t tcps_sc_collisions; /* # of hash collisions */ u_quad_t tcps_sc_retransmitted; /* # of retransmissions */ u_quad_t tcps_sc_delayed_free; /* # of delayed pool_put()s */ u_quad_t tcps_selfquench; /* # of ENOBUFS we get on output */ u_quad_t tcps_badsig; /* # of drops due to bad signature */ u_quad_t tcps_goodsig; /* # of packets with good signature */ }; /* * Names for TCP sysctl objects. */ #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */ #define TCPCTL_SENDSPACE 2 /* default send buffer */ #define TCPCTL_RECVSPACE 3 /* default recv buffer */ #define TCPCTL_MSSDFLT 4 /* default seg size */ #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */ #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */ #if 0 /*obsoleted*/ #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */ #endif #define TCPCTL_INIT_WIN 8 /* initial window */ #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */ #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */ #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */ #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */ #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */ #define TCPCTL_CWM 14 /* Congestion Window Monitoring */ #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */ #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */ #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */ #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */ #define TCPCTL_KEEPCNT 19 /* keepalive count */ #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */ #define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */ #define TCPCTL_LOG_REFUSED 22 /* Log refused connections */ #if 0 /*obsoleted*/ #define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */ #endif #define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */ #define TCPCTL_DELACK_TICKS 25 /* # ticks to delay ACK */ #define TCPCTL_INIT_WIN_LOCAL 26 /* initial window for local nets */ #define TCPCTL_IDENT 27 /* rfc 931 identd */ #define TCPCTL_ACKDROPRATELIMIT 28 /* SYN/RST -> ACK rate limit */ #define TCPCTL_LOOPBACKCKSUM 29 /* do TCP checksum on loopback */ #define TCPCTL_MAXID 30 #define TCPCTL_NAMES { \ { 0, 0 }, \ { "rfc1323", CTLTYPE_INT }, \ { "sendspace", CTLTYPE_INT }, \ { "recvspace", CTLTYPE_INT }, \ { "mssdflt", CTLTYPE_INT }, \ { "syn_cache_limit", CTLTYPE_INT }, \ { "syn_bucket_limit", CTLTYPE_INT }, \ { 0, 0 },\ { "init_win", CTLTYPE_INT }, \ { "mss_ifmtu", CTLTYPE_INT }, \ { "sack", CTLTYPE_INT }, \ { "win_scale", CTLTYPE_INT }, \ { "timestamps", CTLTYPE_INT }, \ { "compat_42", CTLTYPE_INT }, \ { "cwm", CTLTYPE_INT }, \ { "cwm_burstsize", CTLTYPE_INT }, \ { "ack_on_push", CTLTYPE_INT }, \ { "keepidle", CTLTYPE_INT }, \ { "keepintvl", CTLTYPE_INT }, \ { "keepcnt", CTLTYPE_INT }, \ { "slowhz", CTLTYPE_INT }, \ { "newreno", CTLTYPE_INT }, \ { "log_refused",CTLTYPE_INT }, \ { 0, 0 }, \ { "rstppslimit", CTLTYPE_INT }, \ { "delack_ticks", CTLTYPE_INT }, \ { "init_win_local", CTLTYPE_INT }, \ { "ident", CTLTYPE_STRUCT }, \ { "ackdropppslimit", CTLTYPE_INT }, \ { "do_loopback_cksum", CTLTYPE_INT }, \ } #ifdef _KERNEL extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ extern struct tcpstat tcpstat; /* tcp statistics */ extern u_int32_t tcp_now; /* for RFC 1323 timestamps */ extern int tcp_do_rfc1323; /* enabled/disabled? */ extern int tcp_do_sack; /* SACK enabled/disabled? */ extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */ extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */ extern int tcp_do_newreno; /* Use the New Reno algorithms */ extern int tcp_mssdflt; /* default seg size */ extern int tcp_init_win; /* initial window */ extern int tcp_init_win_local; /* initial window for local nets */ extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */ extern int tcp_compat_42; /* work around ancient broken TCP peers */ extern int tcp_cwm; /* enable Congestion Window Monitoring */ extern int tcp_cwm_burstsize; /* burst size allowed by CWM */ extern int tcp_ack_on_push; /* ACK immediately on PUSH */ extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ extern int tcp_log_refused; /* log refused connections */ extern int tcp_do_loopback_cksum;/* do TCP checksum on loopback? */ extern int tcp_rst_ppslim; extern int tcp_ackdrop_ppslim; extern int tcp_syn_cache_size; extern struct syn_cache_head tcp_syn_cache[]; extern u_long syn_cache_count; extern struct pool tcpipqent_pool; #ifdef MBUFTRACE extern struct mowner tcp_rx_mowner; extern struct mowner tcp_tx_mowner; extern struct mowner tcp_mowner; #endif #define TCPCTL_VARIABLES { \ { 0 }, \ { 1, 0, &tcp_do_rfc1323 }, \ { 1, 0, &tcp_sendspace }, \ { 1, 0, &tcp_recvspace }, \ { 1, 0, &tcp_mssdflt }, \ { 1, 0, &tcp_syn_cache_limit }, \ { 1, 0, &tcp_syn_bucket_limit }, \ { 0 }, \ { 1, 0, &tcp_init_win }, \ { 1, 0, &tcp_mss_ifmtu }, \ { 1, 0, &tcp_do_sack }, \ { 1, 0, &tcp_do_win_scale }, \ { 1, 0, &tcp_do_timestamps }, \ { 1, 0, &tcp_compat_42 }, \ { 1, 0, &tcp_cwm }, \ { 1, 0, &tcp_cwm_burstsize }, \ { 1, 0, &tcp_ack_on_push }, \ { 1, 0, &tcp_keepidle }, \ { 1, 0, &tcp_keepintvl }, \ { 1, 0, &tcp_keepcnt }, \ { 1, 1, 0, PR_SLOWHZ }, \ { 1, 0, &tcp_do_newreno }, \ { 1, 0, &tcp_log_refused }, \ { 0 }, \ { 1, 0, &tcp_rst_ppslim }, \ { 1, 0, &tcp_delack_ticks }, \ { 1, 0, &tcp_init_win_local }, \ { 1, 0, &tcp_ackdrop_ppslim }, \ } #ifdef __NO_STRICT_ALIGNMENT #define TCP_HDR_ALIGNED_P(th) 1 #else #define TCP_HDR_ALIGNED_P(th) ((((vaddr_t)(th)) & 3) == 0) #endif struct secasvar; int tcp_attach(struct socket *); void tcp_canceltimers(struct tcpcb *); int tcp_timers_invoking(struct tcpcb*); struct tcpcb * tcp_close(struct tcpcb *); int tcp_isdead(struct tcpcb *); #ifdef INET6 void tcp6_ctlinput(int, struct sockaddr *, void *); #endif void *tcp_ctlinput(int, struct sockaddr *, void *); int tcp_ctloutput(int, struct socket *, int, int, struct mbuf **); struct tcpcb * tcp_disconnect(struct tcpcb *); struct tcpcb * tcp_drop(struct tcpcb *, int); #ifdef TCP_SIGNATURE int tcp_signature_apply(void *, caddr_t, u_int); struct secasvar *tcp_signature_getsav(struct mbuf *, struct tcphdr *); int tcp_signature(struct mbuf *, struct tcphdr *, int, struct secasvar *, char *); #endif int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *, struct mbuf *, int, struct tcp_opt_info *); void tcp_drain(void); void tcp_established(struct tcpcb *); void tcp_init(void); #ifdef INET6 int tcp6_input(struct mbuf **, int *, int); #endif void tcp_input(struct mbuf *, ...); u_long tcp_mss_to_advertise(const struct ifnet *, int); void tcp_mss_from_peer(struct tcpcb *, int); void tcp_tcpcb_template(void); struct tcpcb * tcp_newtcpcb(int, void *); void tcp_notify(struct inpcb *, int); #ifdef INET6 void tcp6_notify(struct in6pcb *, int); #endif u_int tcp_optlen(struct tcpcb *); int tcp_output(struct tcpcb *); void tcp_pulloutofband(struct socket *, struct tcphdr *, struct mbuf *, int); void tcp_quench(struct inpcb *, int); #ifdef INET6 void tcp6_quench(struct in6pcb *, int); #endif int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *); int tcp_respond(struct tcpcb *, struct mbuf *, struct mbuf *, struct tcphdr *, tcp_seq, tcp_seq, int); void tcp_rmx_rtt(struct tcpcb *); void tcp_setpersist(struct tcpcb *); #ifdef TCP_SIGNATURE int tcp_signature_compute(struct mbuf *, struct tcphdr *, int, int, int, u_char *, u_int); #endif void tcp_slowtimo(void); struct mbuf * tcp_template(struct tcpcb *); void tcp_trace(int, int, struct tcpcb *, struct mbuf *, int); struct tcpcb * tcp_usrclosed(struct tcpcb *); int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t); int tcp_usrreq(struct socket *, int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); void tcp_xmit_timer(struct tcpcb *, uint32_t); tcp_seq tcp_new_iss(struct tcpcb *, tcp_seq); tcp_seq tcp_new_iss1(void *, void *, u_int16_t, u_int16_t, size_t, tcp_seq); int syn_cache_add(struct sockaddr *, struct sockaddr *, struct tcphdr *, unsigned int, struct socket *, struct mbuf *, u_char *, int, struct tcp_opt_info *); void syn_cache_unreach(struct sockaddr *, struct sockaddr *, struct tcphdr *); struct socket *syn_cache_get(struct sockaddr *, struct sockaddr *, struct tcphdr *, unsigned int, unsigned int, struct socket *so, struct mbuf *); void syn_cache_init(void); void syn_cache_insert(struct syn_cache *, struct tcpcb *); struct syn_cache *syn_cache_lookup(struct sockaddr *, struct sockaddr *, struct syn_cache_head **); void syn_cache_reset(struct sockaddr *, struct sockaddr *, struct tcphdr *); int syn_cache_respond(struct syn_cache *, struct mbuf *); void syn_cache_timer(void *); void syn_cache_cleanup(struct tcpcb *); int tcp_newreno(struct tcpcb *, struct tcphdr *); #endif #endif /* _NETINET_TCP_VAR_H_ */