/* * Copyright (c) 1982, 1986, 1993 *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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * * This product includes software developed by the University of * California, Berkeley and its contributors. * * 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. * */ #ifndef NETINET_TCP_VAR_H #define NETINET_TCP_VAR_H /* * Tcp control block, one per tcp connection */ struct tcpcb { struct tcpiphdr *seg_next; struct tcpiphdr *seg_prev; int16 t_state; /* state of this connection */ int16 t_timer[TCPT_NTIMERS]; /* tcp timers */ int16 t_rxtshift; /* log(2) of rexmt exp. backoff */ int16 t_rxtcur; /* current retransmit value */ int16 t_dupacks; /* consecutive dup acks recd */ uint16 t_maxseg; /* maximum segment size */ int8 t_force; /* 1 if forcing out a byte */ uint16 t_flags; struct tcpiphdr *t_template; /* skeletal packet for transmit */ struct inpcb *t_inpcb; /* back pointer to internet pcb */ /* * 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 */ unsigned long snd_wnd; /* send window */ /* receive sequence variables */ unsigned 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) */ unsigned long snd_cwnd; /* congestion-controlled window */ unsigned long snd_ssthresh; /* snd_cwnd size threshhold for * for slow start exponential to * linear switch */ uint16 t_maxopd; /* mss plus options */ uint16 t_peermss; /* peer's maximum segment size */ /* * transmit timing stuff. See below for scale of srtt and rttvar. * "Variance" is actually smoothed difference. */ int16 t_idle; /* inactivity time */ int16 t_rtt; /* round trip time */ tcp_seq t_rtseq; /* sequence number being timed */ uint16 t_srtt; /* smoothed round-trip time */ uint16 t_rttvar; /* variance in round-trip time */ uint16 t_rttmin; /* minimum rtt allowed */ uint32 max_sndwnd; /* largest window peer has offered */ /* out-of-band data */ int8 t_oobflags; /* have some */ int8 t_iobc; /* input character */ int16 t_softerror; /* possible error, not yet reported... */ /* RFC 1323 variables */ uint8 snd_scale; /* window scaling for send window */ uint8 rcv_scale; /* window scaling for recv window */ uint8 request_r_scale; /* pending window scaling */ uint8 requested_s_scale; uint32 ts_recent; /* timestamp echo data */ uint32 ts_recent_age; /* when last updated */ tcp_seq last_ack_sent; }; #define intotcpcb(ip) ((struct tcpcb*)(ip)->inp_ppcb) #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) #define TF_ACKNOW 0x0001 /* send ACK immeadiately */ #define TF_DELACK 0x0002 /* send 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_SENTFIN 0x0010 /* have sent FIN */ #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_SIGNATURE 0x0400 /* require TCP MD5 signature */ #define TCPOOB_HAVEDATA 0x01 /* we have TCP OOB data */ #define TCPOOB_HADDATA 0x02 /* we've had some TCP OOB data */ /* * 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 8 /* multiplier for srtt; 3 bits frac. */ #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ #define TCP_RTTVAR_SCALE 4 /* multiplier for rttvar; 2 bits */ #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ #define TCP_REXMTVAL(tp) \ ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) /* * TCP statistics. * Many of these should be kept per connection, * but that's inconvenient at the moment. */ struct tcpstat { uint32 tcps_connattempt; /* connections initiated */ uint32 tcps_accepts; /* connections accepted */ uint32 tcps_connects; /* connections established */ uint32 tcps_drops; /* connections dropped */ uint32 tcps_conndrops; /* embryonic connections dropped */ uint32 tcps_closed; /* conn. closed (includes drops) */ uint32 tcps_segstimed; /* segs where we tried to get rtt */ uint32 tcps_rttupdated; /* times we succeeded */ uint32 tcps_delack; /* delayed acks sent */ uint32 tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ uint32 tcps_rexmttimeo; /* retransmit timeouts */ uint32 tcps_persisttimeo; /* persist timeouts */ uint32 tcps_persistdrop; /* connections dropped in persist */ uint32 tcps_keeptimeo; /* keepalive timeouts */ uint32 tcps_keepprobe; /* keepalive probes sent */ uint32 tcps_keepdrops; /* connections dropped in keepalive */ uint32 tcps_sndtotal; /* total packets sent */ uint32 tcps_sndpack; /* data packets sent */ uint64 tcps_sndbyte; /* data bytes sent */ uint32 tcps_sndrexmitpack; /* data packets retransmitted */ uint64 tcps_sndrexmitbyte; /* data bytes retransmitted */ uint64 tcps_sndrexmitfast; /* Fast retransmits */ uint32 tcps_sndacks; /* ack-only packets sent */ uint32 tcps_sndprobe; /* window probes sent */ uint32 tcps_sndurg; /* packets sent with URG only */ uint32 tcps_sndwinup; /* window update-only packets sent */ uint32 tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ uint32 tcps_rcvtotal; /* total packets received */ uint32 tcps_rcvpack; /* packets received in sequence */ uint64 tcps_rcvbyte; /* bytes received in sequence */ uint32 tcps_rcvbadsum; /* packets received with ccksum errs */ uint32 tcps_rcvbadoff; /* packets received with bad offset */ uint32 tcps_rcvmemdrop; /* packets dropped for lack of memory */ uint32 tcps_rcvnosec; /* packets dropped for lack of ipsec */ uint32 tcps_rcvshort; /* packets received too short */ uint32 tcps_rcvduppack; /* duplicate-only packets received */ uint64 tcps_rcvdupbyte; /* duplicate-only bytes received */ uint32 tcps_rcvpartduppack; /* packets with some duplicate data */ uint64 tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ uint32 tcps_rcvoopack; /* out-of-order packets received */ uint64 tcps_rcvoobyte; /* out-of-order bytes received */ uint32 tcps_rcvpackafterwin; /* packets with data after window */ uint64 tcps_rcvbyteafterwin; /* bytes rcvd after window */ uint32 tcps_rcvafterclose; /* packets rcvd after "close" */ uint32 tcps_rcvwinprobe; /* rcvd window probe packets */ uint32 tcps_rcvdupack; /* rcvd duplicate acks */ uint32 tcps_rcvacktoomuch; /* rcvd acks for unsent data */ uint32 tcps_rcvackpack; /* rcvd ack packets */ uint64 tcps_rcvackbyte; /* bytes acked by rcvd acks */ uint32 tcps_rcvwinupd; /* rcvd window update packets */ uint32 tcps_pawsdrop; /* segments dropped due to PAWS */ uint32 tcps_predack; /* times hdr predict ok for acks */ uint32 tcps_preddat; /* times hdr predict ok for data pkts */ uint32 tcps_pcbhashmiss; /* input packets missing pcb hash */ uint32 tcps_noport; /* no socket on port */ uint32 tcps_badsyn; /* SYN packet with src==dst rcv'ed */ uint32 tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */ uint64 tcps_rcvgoodsig; /* rcvd good TCP signatures */ uint32 tcps_inhwcsum; /* input hardware-checksummed packets */ uint32 tcps_outhwcsum; /* output hardware-checksummed packets */ }; /* * Names for TCP sysctl objects. */ #define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */ #define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */ #define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */ #define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */ #define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */ #define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */ #define TCPCTL_RECVSPACE 7 /* receive buffer space */ #define TCPCTL_SENDSPACE 8 /* send buffer space */ #define TCPCTL_IDENT 9 /* get connection owner */ #define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */ #define TCPCTL_MSSDFLT 11 /* Default maximum segment size */ #define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */ #define TCPCTL_MAXID 13 //#ifdef _NETWORK_STACK extern struct inpcb tcb; extern struct tcpstat tcpstat; extern int tcp_mssdflt; extern int tcp_do_rfc1323; extern unsigned long tcp_now; void tcp_input(struct mbuf *, int); int tcp_output(struct tcpcb*); int tcp_mss(struct tcpcb *, uint); void tcp_mss_update(struct tcpcb *); void tcp_quench(struct inpcb *, int); int tcp_userreq(struct socket *, int, struct mbuf *, struct mbuf *, struct mbuf *); struct tcpcb * tcp_timers(struct tcpcb *, int); struct tcpcb *tcp_close(struct tcpcb *); void tcp_setpersist(struct tcpcb *); struct tcpcb *tcp_drop(struct tcpcb *, int); void tcp_respond(struct tcpcb *, struct tcpiphdr *, struct mbuf *, tcp_seq, tcp_seq, int); void tcp_xmit_timer(struct tcpcb *, int16); void tcp_dooptions(struct tcpcb *, u_char *, int, struct tcpiphdr *, int *, uint32 *, uint32 *); struct tcpiphdr *tcp_template(struct tcpcb *); void tcp_pulloutofband(struct socket *, struct tcpiphdr *, struct mbuf *); void tcp_canceltimers(struct tcpcb *); void tcp_trace(int16, int16, struct tcpcb *, void *, int, int); void tcp_slowtimer(void *data); void tcp_fasttimer(void *data); //#endif #endif /* NETINET_TCP_VAR_H */