| /*- |
| * 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. |
| * 4. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _BSD_NETINET_TCP_VAR_H_ |
| #define _BSD_NETINET_TCP_VAR_H_ |
| |
| #include <netinet/bsd_tcp.h> |
| |
| #ifdef _FREEBSD_KERNEL |
| #include <net/bsd_vnet.h> |
| |
| /* |
| * Kernel variables for tcp. |
| */ |
| VNET_DECLARE(int, tcp_do_rfc1323); |
| VNET_DECLARE(int, tcp_reass_qsize); |
| VNET_DECLARE(struct uma_zone *, tcp_reass_zone); |
| #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) |
| #define V_tcp_reass_qsize VNET(tcp_reass_qsize) |
| #define V_tcp_reass_zone VNET(tcp_reass_zone) |
| |
| #endif /* _FREEBSD_KERNEL */ |
| |
| /* TCP segment queue entry */ |
| struct tseg_qent { |
| LIST_ENTRY(tseg_qent) tqe_q; |
| int tqe_len; /* TCP segment data length */ |
| struct tcphdr *tqe_th; /* a pointer to tcp header */ |
| struct mbuf *tqe_m; /* mbuf contains packet */ |
| }; |
| LIST_HEAD(tsegqe_head, tseg_qent); |
| |
| 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; |
| |
| int ispare; /* explicit pad for 64bit alignment */ |
| uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */ |
| }; |
| |
| struct tcptemp { |
| u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ |
| struct tcphdr tt_t; |
| }; |
| |
| #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ |
| |
| /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ |
| #ifdef INET6 |
| #define ND6_HINT(tp) \ |
| do { \ |
| if ((tp) && (tp)->t_inpcb && \ |
| ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ |
| nd6_nud_hint(NULL, NULL, 0); \ |
| } while (0) |
| #else |
| #define ND6_HINT(tp) |
| #endif |
| |
| /* |
| * Tcp control block, one per tcp; fields: |
| * Organized for 16 byte cacheline efficiency. |
| */ |
| struct tcpcb { |
| struct tsegqe_head t_segq; /* segment reassembly queue */ |
| void *t_pspare[2]; /* new reassembly queue */ |
| int t_segqlen; /* segment reassembly queue length */ |
| int t_dupacks; /* consecutive dup acks recd */ |
| |
| struct tcp_timer *t_timers; /* All the TCP timers in one struct */ |
| |
| struct inpcb *t_inpcb; /* back pointer to internet pcb */ |
| int t_state; /* state of this connection */ |
| u_int t_flags; |
| |
| struct vnet *t_vnet; /* back pointer to parent vnet */ |
| |
| tcp_seq snd_una; /* send unacknowledged */ |
| tcp_seq snd_max; /* highest sequence number sent; |
| * used to recognize retransmits |
| */ |
| tcp_seq snd_nxt; /* send next */ |
| tcp_seq snd_up; /* send urgent pointer */ |
| |
| tcp_seq snd_wl1; /* window update seg seq number */ |
| tcp_seq snd_wl2; /* window update seg ack number */ |
| tcp_seq iss; /* initial send sequence number */ |
| tcp_seq irs; /* initial receive sequence number */ |
| |
| tcp_seq rcv_nxt; /* receive next */ |
| tcp_seq rcv_adv; /* advertised window */ |
| u_long rcv_wnd; /* receive window */ |
| tcp_seq rcv_up; /* receive urgent pointer */ |
| |
| u_long snd_wnd; /* send window */ |
| u_long snd_cwnd; /* congestion-controlled window */ |
| u_long snd_bwnd; /* bandwidth-controlled window */ |
| u_long snd_ssthresh; /* snd_cwnd size threshold for |
| * for slow start exponential to |
| * linear switch |
| */ |
| u_long snd_bandwidth; /* calculated bandwidth or 0 */ |
| tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ |
| |
| u_int t_maxopd; /* mss plus options */ |
| |
| u_int t_rcvtime; /* inactivity time */ |
| u_int t_starttime; /* time connection was established */ |
| u_int t_rtttime; /* RTT measurement start time */ |
| tcp_seq t_rtseq; /* sequence number being timed */ |
| |
| u_int t_bw_rtttime; /* used for bandwidth calculation */ |
| tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ |
| |
| int t_rxtcur; /* current retransmit value (ticks) */ |
| u_int t_maxseg; /* maximum segment size */ |
| int t_srtt; /* smoothed round-trip time */ |
| int t_rttvar; /* variance in round-trip time */ |
| |
| int t_rxtshift; /* log(2) of rexmt exp. backoff */ |
| u_int t_rttmin; /* minimum rtt allowed */ |
| u_int t_rttbest; /* best rtt we've seen */ |
| u_long t_rttupdated; /* number of times rtt sampled */ |
| u_long max_sndwnd; /* largest window peer has offered */ |
| |
| int t_softerror; /* possible error not yet reported */ |
| /* out-of-band data */ |
| char t_oobflags; /* have some */ |
| char t_iobc; /* input character */ |
| /* RFC 1323 variables */ |
| u_char snd_scale; /* window scaling for send window */ |
| u_char rcv_scale; /* window scaling for recv window */ |
| u_char request_r_scale; /* pending window scaling */ |
| u_int32_t ts_recent; /* timestamp echo data */ |
| u_int ts_recent_age; /* when last updated */ |
| u_int32_t ts_offset; /* our timestamp offset */ |
| |
| tcp_seq last_ack_sent; |
| /* experimental */ |
| u_long snd_cwnd_prev; /* cwnd prior to retransmit */ |
| u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ |
| tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ |
| u_int t_badrxtwin; /* window for retransmit recovery */ |
| u_char snd_limited; /* segments limited transmitted */ |
| /* SACK related state */ |
| int snd_numholes; /* number of holes seen by sender */ |
| TAILQ_HEAD(sackhole_head, sackhole) snd_holes; |
| /* SACK scoreboard (sorted) */ |
| tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ |
| int rcv_numsacks; /* # distinct sack blks present */ |
| struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ |
| tcp_seq sack_newdata; /* New data xmitted in this recovery |
| episode starts at this seq number */ |
| struct sackhint sackhint; /* SACK scoreboard hint */ |
| int t_rttlow; /* smallest observerved RTT */ |
| u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ |
| int rfbuf_cnt; /* recv buffer autoscaling byte count */ |
| struct toe_usrreqs *t_tu; /* offload operations vector */ |
| void *t_toe; /* TOE pcb pointer */ |
| int t_bytes_acked; /* # bytes acked during current RTT */ |
| |
| int t_ispare; /* explicit pad for 64bit alignment */ |
| void *t_pspare2[6]; /* 2 CC / 4 TBD */ |
| uint64_t _pad[12]; /* 7 UTO, 5 TBD (1-2 CC/RTT?) */ |
| }; |
| |
| /* |
| * 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_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 IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) |
| #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY |
| #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY |
| |
| /* |
| * Flags for the t_oobflags field. |
| */ |
| #define TCPOOB_HAVEDATA 0x01 |
| #define TCPOOB_HADDATA 0x02 |
| |
| #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 */ |
| |
| /* |
| * 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_int64_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_MAXOPT 0x0100 |
| 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_int16_t to_mss; /* maximum segment size */ |
| u_int8_t to_wscale; /* window scaling */ |
| u_int8_t to_nsacks; /* number of SACK blocks */ |
| }; |
| |
| /* |
| * Flags for tcp_dooptions. |
| */ |
| #define TO_SYN 0x01 /* parse SYN-only options */ |
| |
| struct hc_metrics_lite { /* must stay in sync with hc_metrics */ |
| u_long rmx_mtu; /* MTU for this path */ |
| u_long rmx_ssthresh; /* outbound gateway buffer limit */ |
| u_long rmx_rtt; /* estimated round trip time */ |
| u_long rmx_rttvar; /* estimated rtt variance */ |
| u_long rmx_bandwidth; /* estimated bandwidth */ |
| u_long rmx_cwnd; /* congestion window */ |
| u_long rmx_sendpipe; /* outbound delay-bandwidth product */ |
| u_long rmx_recvpipe; /* inbound delay-bandwidth product */ |
| }; |
| |
| #ifndef _BSD_NETINET_IN_PCB_H_ |
| struct in_conninfo; |
| #endif /* _BSD_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 */ |
| u_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; |
| }; |
| |
| #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 { |
| u_long tcps_connattempt; /* connections initiated */ |
| u_long tcps_accepts; /* connections accepted */ |
| u_long tcps_connects; /* connections established */ |
| u_long tcps_drops; /* connections dropped */ |
| u_long tcps_conndrops; /* embryonic connections dropped */ |
| u_long tcps_minmssdrops; /* average minmss too low drops */ |
| u_long tcps_closed; /* conn. closed (includes drops) */ |
| u_long tcps_segstimed; /* segs where we tried to get rtt */ |
| u_long tcps_rttupdated; /* times we succeeded */ |
| u_long tcps_delack; /* delayed acks sent */ |
| u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ |
| u_long tcps_rexmttimeo; /* retransmit timeouts */ |
| u_long tcps_persisttimeo; /* persist timeouts */ |
| u_long tcps_keeptimeo; /* keepalive timeouts */ |
| u_long tcps_keepprobe; /* keepalive probes sent */ |
| u_long tcps_keepdrops; /* connections dropped in keepalive */ |
| |
| u_long tcps_sndtotal; /* total packets sent */ |
| u_long tcps_sndpack; /* data packets sent */ |
| u_long tcps_sndbyte; /* data bytes sent */ |
| u_long tcps_sndrexmitpack; /* data packets retransmitted */ |
| u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ |
| u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ |
| u_long tcps_sndacks; /* ack-only packets sent */ |
| u_long tcps_sndprobe; /* window probes sent */ |
| u_long tcps_sndurg; /* packets sent with URG only */ |
| u_long tcps_sndwinup; /* window update-only packets sent */ |
| u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ |
| |
| u_long tcps_rcvtotal; /* total packets received */ |
| u_long tcps_rcvpack; /* packets received in sequence */ |
| u_long tcps_rcvbyte; /* bytes received in sequence */ |
| u_long tcps_rcvbadsum; /* packets received with ccksum errs */ |
| u_long tcps_rcvbadoff; /* packets received with bad offset */ |
| u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ |
| u_long tcps_rcvshort; /* packets received too short */ |
| u_long tcps_rcvduppack; /* duplicate-only packets received */ |
| u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ |
| u_long tcps_rcvpartduppack; /* packets with some duplicate data */ |
| u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ |
| u_long tcps_rcvoopack; /* out-of-order packets received */ |
| u_long tcps_rcvoobyte; /* out-of-order bytes received */ |
| u_long tcps_rcvpackafterwin; /* packets with data after window */ |
| u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ |
| u_long tcps_rcvafterclose; /* packets rcvd after "close" */ |
| u_long tcps_rcvwinprobe; /* rcvd window probe packets */ |
| u_long tcps_rcvdupack; /* rcvd duplicate acks */ |
| u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ |
| u_long tcps_rcvackpack; /* rcvd ack packets */ |
| u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ |
| u_long tcps_rcvwinupd; /* rcvd window update packets */ |
| u_long tcps_pawsdrop; /* segments dropped due to PAWS */ |
| u_long tcps_predack; /* times hdr predict ok for acks */ |
| u_long tcps_preddat; /* times hdr predict ok for data pkts */ |
| u_long tcps_pcbcachemiss; |
| u_long tcps_cachedrtt; /* times cached RTT in route updated */ |
| u_long tcps_cachedrttvar; /* times cached rttvar updated */ |
| u_long tcps_cachedssthresh; /* times cached ssthresh updated */ |
| u_long tcps_usedrtt; /* times RTT initialized from route */ |
| u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ |
| u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ |
| u_long tcps_persistdrop; /* timeout in persist state */ |
| u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ |
| u_long tcps_mturesent; /* resends due to MTU discovery */ |
| u_long tcps_listendrop; /* listen queue overflows */ |
| u_long tcps_badrst; /* ignored RSTs in the window */ |
| |
| u_long tcps_sc_added; /* entry added to syncache */ |
| u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ |
| u_long tcps_sc_dupsyn; /* duplicate SYN packet */ |
| u_long tcps_sc_dropped; /* could not reply to packet */ |
| u_long tcps_sc_completed; /* successful extraction of entry */ |
| u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ |
| u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ |
| u_long tcps_sc_reset; /* RST removed entry from syncache */ |
| u_long tcps_sc_stale; /* timed out or listen socket gone */ |
| u_long tcps_sc_aborted; /* syncache entry aborted */ |
| u_long tcps_sc_badack; /* removed due to bad ACK */ |
| u_long tcps_sc_unreach; /* ICMP unreachable received */ |
| u_long tcps_sc_zonefail; /* zalloc() failed */ |
| u_long tcps_sc_sendcookie; /* SYN cookie sent */ |
| u_long tcps_sc_recvcookie; /* SYN cookie received */ |
| |
| u_long tcps_hc_added; /* entry added to hostcache */ |
| u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ |
| |
| u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ |
| |
| /* SACK related stats */ |
| u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ |
| u_long tcps_sack_rexmits; /* SACK rexmit segments */ |
| u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ |
| u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ |
| u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ |
| u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ |
| |
| /* ECN related stats */ |
| u_long tcps_ecn_ce; /* ECN Congestion Experienced */ |
| u_long tcps_ecn_ect0; /* ECN Capable Transport */ |
| u_long tcps_ecn_ect1; /* ECN Capable Transport */ |
| u_long tcps_ecn_shs; /* ECN successful handshakes */ |
| u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ |
| |
| u_long _pad[12]; /* 6 UTO, 6 TBD */ |
| }; |
| |
| #ifdef _FREEBSD_KERNEL |
| /* |
| * In-kernel consumers can use these accessor macros directly to update |
| * stats. |
| */ |
| #define TCPSTAT_ADD(name, val) V_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(u_long)) |
| #endif |
| |
| /* |
| * TCB structure exported to user-land via sysctl(3). |
| * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been |
| * included. Not all of our clients do. |
| */ |
| #if defined(_BSD_NETINET_IN_PCB_H_) && defined(_BSD_SYS_SOCKETVAR_H_) |
| struct xtcpcb { |
| size_t xt_len; |
| struct inpcb xt_inp; |
| struct tcpcb xt_tp; |
| struct xsocket xt_socket; |
| u_quad_t xt_alignment_hack; |
| }; |
| #endif |
| |
| /* |
| * Names for TCP sysctl objects |
| */ |
| #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ |
| #define TCPCTL_MSSDFLT 3 /* MSS default */ |
| #define TCPCTL_STATS 4 /* statistics (read-only) */ |
| #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ |
| #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ |
| #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ |
| #define TCPCTL_SENDSPACE 8 /* send buffer space */ |
| #define TCPCTL_RECVSPACE 9 /* receive buffer space */ |
| #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ |
| #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ |
| #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ |
| #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ |
| #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ |
| #define TCPCTL_DROP 15 /* drop tcp connection */ |
| #define TCPCTL_MAXID 16 |
| #define TCPCTL_FINWAIT2_TIMEOUT 17 |
| |
| #define TCPCTL_NAMES { \ |
| { 0, 0 }, \ |
| { "rfc1323", CTLTYPE_INT }, \ |
| { "mssdflt", CTLTYPE_INT }, \ |
| { "stats", CTLTYPE_STRUCT }, \ |
| { "rttdflt", CTLTYPE_INT }, \ |
| { "keepidle", CTLTYPE_INT }, \ |
| { "keepintvl", CTLTYPE_INT }, \ |
| { "sendspace", CTLTYPE_INT }, \ |
| { "recvspace", CTLTYPE_INT }, \ |
| { "keepinit", CTLTYPE_INT }, \ |
| { "pcblist", CTLTYPE_STRUCT }, \ |
| { "delacktime", CTLTYPE_INT }, \ |
| { "v6mssdflt", CTLTYPE_INT }, \ |
| { "maxid", CTLTYPE_INT }, \ |
| } |
| |
| |
| #ifdef _FREEBSD_KERNEL |
| #ifdef SYSCTL_DECL |
| SYSCTL_DECL(_net_inet_tcp); |
| SYSCTL_DECL(_net_inet_tcp_sack); |
| #endif |
| MALLOC_DECLARE(M_TCPLOG); |
| |
| extern int tcp_log_in_vain; |
| |
| VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ |
| VNET_DECLARE(struct inpcbinfo, tcbinfo); |
| VNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ |
| VNET_DECLARE(int, tcp_mssdflt); /* XXX */ |
| VNET_DECLARE(int, tcp_minmss); |
| VNET_DECLARE(int, tcp_delack_enabled); |
| VNET_DECLARE(int, tcp_do_newreno); |
| VNET_DECLARE(int, path_mtu_discovery); |
| VNET_DECLARE(int, ss_fltsz); |
| VNET_DECLARE(int, ss_fltsz_local); |
| |
| #define V_tcb VNET(tcb) |
| #define V_tcbinfo VNET(tcbinfo) |
| #define V_tcpstat VNET(tcpstat) |
| #define V_tcp_mssdflt VNET(tcp_mssdflt) |
| #define V_tcp_minmss VNET(tcp_minmss) |
| #define V_tcp_delack_enabled VNET(tcp_delack_enabled) |
| #define V_tcp_do_newreno VNET(tcp_do_newreno) |
| #define V_path_mtu_discovery VNET(path_mtu_discovery) |
| #define V_ss_fltsz VNET(ss_fltsz) |
| #define V_ss_fltsz_local VNET(ss_fltsz_local) |
| |
| VNET_DECLARE(int, blackhole); |
| VNET_DECLARE(int, drop_synfin); |
| VNET_DECLARE(int, tcp_do_rfc3042); |
| VNET_DECLARE(int, tcp_do_rfc3390); |
| VNET_DECLARE(int, tcp_insecure_rst); |
| VNET_DECLARE(int, tcp_do_autorcvbuf); |
| VNET_DECLARE(int, tcp_autorcvbuf_inc); |
| VNET_DECLARE(int, tcp_autorcvbuf_max); |
| VNET_DECLARE(int, tcp_do_rfc3465); |
| VNET_DECLARE(int, tcp_abc_l_var); |
| |
| #define V_blackhole VNET(blackhole) |
| #define V_drop_synfin VNET(drop_synfin) |
| #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) |
| #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) |
| #define V_tcp_insecure_rst VNET(tcp_insecure_rst) |
| #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) |
| #define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc) |
| #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) |
| #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) |
| #define V_tcp_abc_l_var VNET(tcp_abc_l_var) |
| |
| VNET_DECLARE(int, tcp_do_tso); |
| VNET_DECLARE(int, tcp_do_autosndbuf); |
| VNET_DECLARE(int, tcp_autosndbuf_inc); |
| VNET_DECLARE(int, tcp_autosndbuf_max); |
| |
| #define V_tcp_do_tso VNET(tcp_do_tso) |
| #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) |
| #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc) |
| #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max) |
| |
| VNET_DECLARE(int, nolocaltimewait); |
| |
| #define V_nolocaltimewait VNET(nolocaltimewait) |
| |
| VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ |
| VNET_DECLARE(int, tcp_sack_maxholes); |
| VNET_DECLARE(int, tcp_sack_globalmaxholes); |
| VNET_DECLARE(int, tcp_sack_globalholes); |
| VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ |
| VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ |
| VNET_DECLARE(int, tcp_ecn_maxretries); |
| |
| #define V_tcp_do_sack VNET(tcp_do_sack) |
| #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes) |
| #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes) |
| #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes) |
| #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) |
| #define V_tcp_do_ecn VNET(tcp_do_ecn) |
| #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) |
| |
| int tcp_addoptions(struct tcpopt *, u_char *); |
| struct tcpcb * |
| tcp_close(struct tcpcb *); |
| void tcp_discardcb(struct tcpcb *); |
| void tcp_twstart(struct tcpcb *); |
| #if 0 |
| int tcp_twrecycleable(struct tcptw *tw); |
| #endif |
| void tcp_twclose(struct tcptw *_tw, int _reuse); |
| void tcp_ctlinput(int, struct sockaddr *, void *); |
| int tcp_ctloutput(struct socket *, struct sockopt *); |
| //struct tcpcb * tcp_drop(struct tcpcb *, int); |
| struct tcpcb * tcp_drop(struct tcpcb *tp, int); |
| void tcp_drain(void); |
| void tcp_fasttimo(void); |
| void tcp_init(void); |
| #ifdef VIMAGE |
| void tcp_destroy(void); |
| #endif |
| void tcp_fini(void *); |
| char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, |
| const void *); |
| int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); |
| void tcp_reass_init(void); |
| void tcp_input(struct mbuf *, int); |
| u_long tcp_maxmtu(struct in_conninfo *, int *); |
| u_long tcp_maxmtu6(struct in_conninfo *, int *); |
| void tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *); |
| void tcp_mss(struct tcpcb *, int); |
| int tcp_mssopt(struct in_conninfo *); |
| struct inpcb * tcp_drop_syn_sent(struct inpcb *, int); |
| struct inpcb * |
| tcp_mtudisc(struct inpcb *, int); |
| struct tcpcb * |
| tcp_newtcpcb(struct inpcb *); |
| int tcp_output(struct tcpcb *); |
| void tcp_respond(struct tcpcb *, void *, |
| struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); |
| 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); |
| int tcp_twrespond(struct tcptw *, int); |
| void tcp_setpersist(struct tcpcb *); |
| #ifdef TCP_SIGNATURE |
| int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); |
| #endif |
| void tcp_slowtimo(void); |
| struct tcptemp * |
| tcpip_maketemplate(struct inpcb *); |
| void tcpip_fillheaders(struct inpcb *, void *, void *); |
| void tcp_timer_activate(struct tcpcb *, int, u_int); |
| int tcp_timer_active(struct tcpcb *, int); |
| void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); |
| void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); |
| /* |
| * 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 *); |
| u_long tcp_hc_getmtu(struct in_conninfo *); |
| void tcp_hc_updatemtu(struct in_conninfo *, u_long); |
| void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); |
| |
| extern struct pr_usrreqs tcp_usrreqs; |
| extern u_long tcp_sendspace; |
| extern u_long tcp_recvspace; |
| tcp_seq tcp_new_isn(struct tcpcb *); |
| |
| void 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 *); |
| u_long tcp_seq_subtract(u_long, u_long ); |
| |
| #endif /* _FREEBSD_KERNEL */ |
| |
| #endif /* _BSD_NETINET_TCP_VAR_H_ */ |
