diff options
Diffstat (limited to 'freebsd/sys/netinet/tcp_var.h')
| -rw-r--r-- | freebsd/sys/netinet/tcp_var.h | 687 |
1 files changed, 687 insertions, 0 deletions
diff --git a/freebsd/sys/netinet/tcp_var.h b/freebsd/sys/netinet/tcp_var.h new file mode 100644 index 00000000..77586144 --- /dev/null +++ b/freebsd/sys/netinet/tcp_var.h @@ -0,0 +1,687 @@ +/*- + * 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 _NETINET_TCP_VAR_HH_ +#define _NETINET_TCP_VAR_HH_ + +#include <freebsd/netinet/tcp.h> + +#ifdef _KERNEL +#include <freebsd/net/vnet.h> + +/* + * Kernel variables for tcp. + */ +VNET_DECLARE(int, tcp_do_rfc1323); +#define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) + +#endif /* _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 _NETINET_IN_PCB_HH_ +struct in_conninfo; +#endif /* _NETINET_IN_PCB_HH_ */ + +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 _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(_NETINET_IN_PCB_HH_) && defined(_SYS_SOCKETVAR_HH_) +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 _KERNEL +#ifdef SYSCTL_DECL +SYSCTL_DECL(_net_inet_tcp); +SYSCTL_DECL(_net_inet_tcp_sack); +MALLOC_DECLARE(M_TCPLOG); +#endif + +VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ +VNET_DECLARE(struct inpcbinfo, tcbinfo); +VNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ +extern int tcp_log_in_vain; +VNET_DECLARE(int, tcp_mssdflt); /* XXX */ +VNET_DECLARE(int, tcp_minmss); +VNET_DECLARE(int, tcp_delack_enabled); +VNET_DECLARE(int, tcp_do_rfc3390); +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_rfc3390 VNET(tcp_do_rfc3390) +#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, tcp_do_sack); /* SACK enabled/disabled */ +VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ +#define V_tcp_do_sack VNET(tcp_do_sack) +#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) + +VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ +VNET_DECLARE(int, tcp_ecn_maxretries); +#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 *); +#ifndef __rtems__ +struct tcpcb * + tcp_drop(struct tcpcb *, int); +#else +struct tcpcb * +tcp_drop(struct tcpcb *tp, int errno); +#endif +void tcp_drain(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 *); +char *tcp_log_vain(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_reass_flush(struct tcpcb *); +#ifdef VIMAGE +void tcp_reass_destroy(void); +#endif +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 *); +#ifndef __rtems__ +struct inpcb * + tcp_drop_syn_sent(struct inpcb *, int); +struct inpcb * + tcp_mtudisc(struct inpcb *, int); +#else +struct inpcb * +tcp_drop_syn_sent(struct inpcb *inp, int errno); +struct inpcb * +tcp_mtudisc(struct inpcb *inp, int errno); +#endif +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 /* _KERNEL */ + +#endif /* _NETINET_TCP_VAR_HH_ */ |