From 2b3e9d9b244e279ef5693a7cf5dacc7903164af5 Mon Sep 17 00:00:00 2001 From: Ralf Corsepius Date: Mon, 22 Jul 2002 09:46:48 +0000 Subject: Remove, moved to cpukit. --- c/src/exec/libnetworking/netinet/tcp_output.c | 755 -------------------------- 1 file changed, 755 deletions(-) delete mode 100644 c/src/exec/libnetworking/netinet/tcp_output.c (limited to 'c/src/exec/libnetworking/netinet/tcp_output.c') diff --git a/c/src/exec/libnetworking/netinet/tcp_output.c b/c/src/exec/libnetworking/netinet/tcp_output.c deleted file mode 100644 index cbb5218dce..0000000000 --- a/c/src/exec/libnetworking/netinet/tcp_output.c +++ /dev/null @@ -1,755 +0,0 @@ -/* - * Copyright (c) 1982, 1986, 1988, 1990, 1993, 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. 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. - * - * @(#)tcp_output.c 8.4 (Berkeley) 5/24/95 - * $Id$ - */ - -#include "opt_tcpdebug.h" - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include -#include -#include -#include -#include -#include -#define TCPOUTFLAGS -#include -#include -#include -#include -#include -#ifdef TCPDEBUG -#include -#endif - -#ifdef notyet -extern struct mbuf *m_copypack(); -#endif - - -/* - * Tcp output routine: figure out what should be sent and send it. - */ -int -tcp_output(tp) - register struct tcpcb *tp; -{ - register struct socket *so = tp->t_inpcb->inp_socket; - register long len, win; - int off, flags, error; - register struct mbuf *m; - register struct tcpiphdr *ti; - u_char opt[TCP_MAXOLEN]; - unsigned optlen, hdrlen; - int idle, sendalot; - struct rmxp_tao *taop; - struct rmxp_tao tao_noncached; - - /* - * Determine length of data that should be transmitted, - * and flags that will be used. - * If there is some data or critical controls (SYN, RST) - * to send, then transmit; otherwise, investigate further. - */ - idle = (tp->snd_max == tp->snd_una); - if (idle && tp->t_idle >= tp->t_rxtcur) - /* - * We have been idle for "a while" and no acks are - * expected to clock out any data we send -- - * slow start to get ack "clock" running again. - */ - tp->snd_cwnd = tp->t_maxseg; -again: - sendalot = 0; - off = tp->snd_nxt - tp->snd_una; - win = min(tp->snd_wnd, tp->snd_cwnd); - - flags = tcp_outflags[tp->t_state]; - /* - * Get standard flags, and add SYN or FIN if requested by 'hidden' - * state flags. - */ - if (tp->t_flags & TF_NEEDFIN) - flags |= TH_FIN; - if (tp->t_flags & TF_NEEDSYN) - flags |= TH_SYN; - - /* - * If in persist timeout with window of 0, send 1 byte. - * Otherwise, if window is small but nonzero - * and timer expired, we will send what we can - * and go to transmit state. - */ - if (tp->t_force) { - if (win == 0) { - /* - * If we still have some data to send, then - * clear the FIN bit. Usually this would - * happen below when it realizes that we - * aren't sending all the data. However, - * if we have exactly 1 byte of unset data, - * then it won't clear the FIN bit below, - * and if we are in persist state, we wind - * up sending the packet without recording - * that we sent the FIN bit. - * - * We can't just blindly clear the FIN bit, - * because if we don't have any more data - * to send then the probe will be the FIN - * itself. - */ - if (off < so->so_snd.sb_cc) - flags &= ~TH_FIN; - win = 1; - } else { - tp->t_timer[TCPT_PERSIST] = 0; - tp->t_rxtshift = 0; - } - } - - len = min(so->so_snd.sb_cc, win) - off; - - if ((taop = tcp_gettaocache(tp->t_inpcb)) == NULL) { - taop = &tao_noncached; - bzero(taop, sizeof(*taop)); - } - - /* - * Lop off SYN bit if it has already been sent. However, if this - * is SYN-SENT state and if segment contains data and if we don't - * know that foreign host supports TAO, suppress sending segment. - */ - if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) { - flags &= ~TH_SYN; - off--, len++; - if (len > 0 && tp->t_state == TCPS_SYN_SENT && - taop->tao_ccsent == 0) - return 0; - } - - /* - * Be careful not to send data and/or FIN on SYN segments - * in cases when no CC option will be sent. - * This measure is needed to prevent interoperability problems - * with not fully conformant TCP implementations. - */ - if ((flags & TH_SYN) && - ((tp->t_flags & TF_NOOPT) || !(tp->t_flags & TF_REQ_CC) || - ((flags & TH_ACK) && !(tp->t_flags & TF_RCVD_CC)))) { - len = 0; - flags &= ~TH_FIN; - } - - if (len < 0) { - /* - * If FIN has been sent but not acked, - * but we haven't been called to retransmit, - * len will be -1. Otherwise, window shrank - * after we sent into it. If window shrank to 0, - * cancel pending retransmit, pull snd_nxt back - * to (closed) window, and set the persist timer - * if it isn't already going. If the window didn't - * close completely, just wait for an ACK. - */ - len = 0; - if (win == 0) { - tp->t_timer[TCPT_REXMT] = 0; - tp->t_rxtshift = 0; - tp->snd_nxt = tp->snd_una; - if (tp->t_timer[TCPT_PERSIST] == 0) - tcp_setpersist(tp); - } - } - if (len > tp->t_maxseg) { - len = tp->t_maxseg; - sendalot = 1; - } - if (SEQ_LT(tp->snd_nxt + len, tp->snd_una + so->so_snd.sb_cc)) - flags &= ~TH_FIN; - - win = sbspace(&so->so_rcv); - - /* - * Sender silly window avoidance. If connection is idle - * and can send all data, a maximum segment, - * at least a maximum default-size segment do it, - * or are forced, do it; otherwise don't bother. - * If peer's buffer is tiny, then send - * when window is at least half open. - * If retransmitting (possibly after persist timer forced us - * to send into a small window), then must resend. - */ - if (len) { - if (len == tp->t_maxseg) - goto send; - if ((idle || tp->t_flags & TF_NODELAY) && - (tp->t_flags & TF_NOPUSH) == 0 && - len + off >= so->so_snd.sb_cc) - goto send; - if (tp->t_force) - goto send; - if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) - goto send; - if (SEQ_LT(tp->snd_nxt, tp->snd_max)) - goto send; - } - - /* - * Compare available window to amount of window - * known to peer (as advertised window less - * next expected input). If the difference is at least two - * max size segments, or at least 50% of the maximum possible - * window, then want to send a window update to peer. - */ - if (win > 0) { - /* - * "adv" is the amount we can increase the window, - * taking into account that we are limited by - * TCP_MAXWIN << tp->rcv_scale. - */ - long adv = min(win, (long)TCP_MAXWIN << tp->rcv_scale) - - (tp->rcv_adv - tp->rcv_nxt); - - if (adv >= (long) (2 * tp->t_maxseg)) - goto send; - if (2 * adv >= (long) so->so_rcv.sb_hiwat) - goto send; - } - - /* - * Send if we owe peer an ACK. - */ - if (tp->t_flags & TF_ACKNOW) - goto send; - if ((flags & TH_RST) || - ((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0)) - goto send; - if (SEQ_GT(tp->snd_up, tp->snd_una)) - goto send; - /* - * If our state indicates that FIN should be sent - * and we have not yet done so, or we're retransmitting the FIN, - * then we need to send. - */ - if (flags & TH_FIN && - ((tp->t_flags & TF_SENTFIN) == 0 || tp->snd_nxt == tp->snd_una)) - goto send; - - /* - * TCP window updates are not reliable, rather a polling protocol - * using ``persist'' packets is used to insure receipt of window - * updates. The three ``states'' for the output side are: - * idle not doing retransmits or persists - * persisting to move a small or zero window - * (re)transmitting and thereby not persisting - * - * tp->t_timer[TCPT_PERSIST] - * is set when we are in persist state. - * tp->t_force - * is set when we are called to send a persist packet. - * tp->t_timer[TCPT_REXMT] - * is set when we are retransmitting - * The output side is idle when both timers are zero. - * - * If send window is too small, there is data to transmit, and no - * retransmit or persist is pending, then go to persist state. - * If nothing happens soon, send when timer expires: - * if window is nonzero, transmit what we can, - * otherwise force out a byte. - */ - if (so->so_snd.sb_cc && tp->t_timer[TCPT_REXMT] == 0 && - tp->t_timer[TCPT_PERSIST] == 0) { - tp->t_rxtshift = 0; - tcp_setpersist(tp); - } - - /* - * No reason to send a segment, just return. - */ - return (0); - -send: - /* - * Before ESTABLISHED, force sending of initial options - * unless TCP set not to do any options. - * NOTE: we assume that the IP/TCP header plus TCP options - * always fit in a single mbuf, leaving room for a maximum - * link header, i.e. - * max_linkhdr + sizeof (struct tcpiphdr) + optlen <= MHLEN - */ - optlen = 0; - hdrlen = sizeof (struct tcpiphdr); - if (flags & TH_SYN) { - tp->snd_nxt = tp->iss; - if ((tp->t_flags & TF_NOOPT) == 0) { - u_short mss; - - opt[0] = TCPOPT_MAXSEG; - opt[1] = TCPOLEN_MAXSEG; - mss = htons((u_short) tcp_mssopt(tp)); - (void)memcpy(opt + 2, &mss, sizeof(mss)); - optlen = TCPOLEN_MAXSEG; - - if ((tp->t_flags & TF_REQ_SCALE) && - ((flags & TH_ACK) == 0 || - (tp->t_flags & TF_RCVD_SCALE))) { - *((u_long *) (opt + optlen)) = htonl( - TCPOPT_NOP << 24 | - TCPOPT_WINDOW << 16 | - TCPOLEN_WINDOW << 8 | - tp->request_r_scale); - optlen += 4; - } - } - } - - /* - * Send a timestamp and echo-reply if this is a SYN and our side - * wants to use timestamps (TF_REQ_TSTMP is set) or both our side - * and our peer have sent timestamps in our SYN's. - */ - if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP && - (flags & TH_RST) == 0 && - ((flags & TH_ACK) == 0 || - (tp->t_flags & TF_RCVD_TSTMP))) { - u_long *lp = (u_long *)(opt + optlen); - - /* Form timestamp option as shown in appendix A of RFC 1323. */ - *lp++ = htonl(TCPOPT_TSTAMP_HDR); - *lp++ = htonl(tcp_now); - *lp = htonl(tp->ts_recent); - optlen += TCPOLEN_TSTAMP_APPA; - } - - /* - * Send `CC-family' options if our side wants to use them (TF_REQ_CC), - * options are allowed (!TF_NOOPT) and it's not a RST. - */ - if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC && - (flags & TH_RST) == 0) { - switch (flags & (TH_SYN|TH_ACK)) { - /* - * This is a normal ACK, send CC if we received CC before - * from our peer. - */ - case TH_ACK: - if (!(tp->t_flags & TF_RCVD_CC)) - break; - /*FALLTHROUGH*/ - - /* - * We can only get here in T/TCP's SYN_SENT* state, when - * we're a sending a non-SYN segment without waiting for - * the ACK of our SYN. A check above assures that we only - * do this if our peer understands T/TCP. - */ - case 0: - opt[optlen++] = TCPOPT_NOP; - opt[optlen++] = TCPOPT_NOP; - opt[optlen++] = TCPOPT_CC; - opt[optlen++] = TCPOLEN_CC; - *(u_int32_t *)&opt[optlen] = htonl(tp->cc_send); - - optlen += 4; - break; - - /* - * This is our initial SYN, check whether we have to use - * CC or CC.new. - */ - case TH_SYN: - opt[optlen++] = TCPOPT_NOP; - opt[optlen++] = TCPOPT_NOP; - opt[optlen++] = tp->t_flags & TF_SENDCCNEW ? - TCPOPT_CCNEW : TCPOPT_CC; - opt[optlen++] = TCPOLEN_CC; - *(u_int32_t *)&opt[optlen] = htonl(tp->cc_send); - optlen += 4; - break; - - /* - * This is a SYN,ACK; send CC and CC.echo if we received - * CC from our peer. - */ - case (TH_SYN|TH_ACK): - if (tp->t_flags & TF_RCVD_CC) { - opt[optlen++] = TCPOPT_NOP; - opt[optlen++] = TCPOPT_NOP; - opt[optlen++] = TCPOPT_CC; - opt[optlen++] = TCPOLEN_CC; - *(u_int32_t *)&opt[optlen] = - htonl(tp->cc_send); - optlen += 4; - opt[optlen++] = TCPOPT_NOP; - opt[optlen++] = TCPOPT_NOP; - opt[optlen++] = TCPOPT_CCECHO; - opt[optlen++] = TCPOLEN_CC; - *(u_int32_t *)&opt[optlen] = - htonl(tp->cc_recv); - optlen += 4; - } - break; - } - } - - hdrlen += optlen; - - /* - * Adjust data length if insertion of options will - * bump the packet length beyond the t_maxopd length. - * Clear the FIN bit because we cut off the tail of - * the segment. - */ - if (len + optlen > tp->t_maxopd) { - /* - * If there is still more to send, don't close the connection. - */ - flags &= ~TH_FIN; - len = tp->t_maxopd - optlen; - sendalot = 1; - } - -/*#ifdef DIAGNOSTIC*/ - if (max_linkhdr + hdrlen > MHLEN) - panic("tcphdr too big"); -/*#endif*/ - - /* - * Grab a header mbuf, attaching a copy of data to - * be transmitted, and initialize the header from - * the template for sends on this connection. - */ - if (len) { - if (tp->t_force && len == 1) - tcpstat.tcps_sndprobe++; - else if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { - tcpstat.tcps_sndrexmitpack++; - tcpstat.tcps_sndrexmitbyte += len; - } else { - tcpstat.tcps_sndpack++; - tcpstat.tcps_sndbyte += len; - } -#ifdef notyet - if ((m = m_copypack(so->so_snd.sb_mb, off, - (int)len, max_linkhdr + hdrlen)) == 0) { - error = ENOBUFS; - goto out; - } - /* - * m_copypack left space for our hdr; use it. - */ - m->m_len += hdrlen; - m->m_data -= hdrlen; -#else - MGETHDR(m, M_DONTWAIT, MT_HEADER); - if (m == NULL) { - error = ENOBUFS; - goto out; - } - m->m_data += max_linkhdr; - m->m_len = hdrlen; - if (len <= MHLEN - hdrlen - max_linkhdr) { - m_copydata(so->so_snd.sb_mb, off, (int) len, - mtod(m, caddr_t) + hdrlen); - m->m_len += len; - } else { - m->m_next = m_copy(so->so_snd.sb_mb, off, (int) len); - if (m->m_next == 0) { - (void) m_free(m); - error = ENOBUFS; - goto out; - } - } -#endif - /* - * If we're sending everything we've got, set PUSH. - * (This will keep happy those implementations which only - * give data to the user when a buffer fills or - * a PUSH comes in.) - */ - if (off + len == so->so_snd.sb_cc) - flags |= TH_PUSH; - } else { - if (tp->t_flags & TF_ACKNOW) - tcpstat.tcps_sndacks++; - else if (flags & (TH_SYN|TH_FIN|TH_RST)) - tcpstat.tcps_sndctrl++; - else if (SEQ_GT(tp->snd_up, tp->snd_una)) - tcpstat.tcps_sndurg++; - else - tcpstat.tcps_sndwinup++; - - MGETHDR(m, M_DONTWAIT, MT_HEADER); - if (m == NULL) { - error = ENOBUFS; - goto out; - } - m->m_data += max_linkhdr; - m->m_len = hdrlen; - } - m->m_pkthdr.rcvif = (struct ifnet *)0; - ti = mtod(m, struct tcpiphdr *); - if (tp->t_template == 0) - panic("tcp_output"); - (void)memcpy(ti, tp->t_template, sizeof (struct tcpiphdr)); - - /* - * Fill in fields, remembering maximum advertised - * window for use in delaying messages about window sizes. - * If resending a FIN, be sure not to use a new sequence number. - */ - if (flags & TH_FIN && tp->t_flags & TF_SENTFIN && - tp->snd_nxt == tp->snd_max) - tp->snd_nxt--; - /* - * If we are doing retransmissions, then snd_nxt will - * not reflect the first unsent octet. For ACK only - * packets, we do not want the sequence number of the - * retransmitted packet, we want the sequence number - * of the next unsent octet. So, if there is no data - * (and no SYN or FIN), use snd_max instead of snd_nxt - * when filling in ti_seq. But if we are in persist - * state, snd_max might reflect one byte beyond the - * right edge of the window, so use snd_nxt in that - * case, since we know we aren't doing a retransmission. - * (retransmit and persist are mutually exclusive...) - */ - if (len || (flags & (TH_SYN|TH_FIN)) || tp->t_timer[TCPT_PERSIST]) - ti->ti_seq = htonl(tp->snd_nxt); - else - ti->ti_seq = htonl(tp->snd_max); - ti->ti_ack = htonl(tp->rcv_nxt); - if (optlen) { - bcopy(opt, ti + 1, optlen); - ti->ti_off = (sizeof (struct tcphdr) + optlen) >> 2; - } - ti->ti_flags = flags; - /* - * Calculate receive window. Don't shrink window, - * but avoid silly window syndrome. - */ - if (win < (long)(so->so_rcv.sb_hiwat / 4) && win < (long)tp->t_maxseg) - win = 0; - if (win < (long)(tp->rcv_adv - tp->rcv_nxt)) - win = (long)(tp->rcv_adv - tp->rcv_nxt); - if (win > (long)TCP_MAXWIN << tp->rcv_scale) - win = (long)TCP_MAXWIN << tp->rcv_scale; - ti->ti_win = htons((u_short) (win>>tp->rcv_scale)); - if (SEQ_GT(tp->snd_up, tp->snd_nxt)) { - ti->ti_urp = htons((u_short)(tp->snd_up - tp->snd_nxt)); - ti->ti_flags |= TH_URG; - } else - /* - * If no urgent pointer to send, then we pull - * the urgent pointer to the left edge of the send window - * so that it doesn't drift into the send window on sequence - * number wraparound. - */ - tp->snd_up = tp->snd_una; /* drag it along */ - - /* - * Put TCP length in extended header, and then - * checksum extended header and data. - */ - if (len + optlen) - ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + - optlen + len)); - ti->ti_sum = in_cksum(m, (int)(hdrlen + len)); - - /* - * In transmit state, time the transmission and arrange for - * the retransmit. In persist state, just set snd_max. - */ - if (tp->t_force == 0 || tp->t_timer[TCPT_PERSIST] == 0) { - tcp_seq startseq = tp->snd_nxt; - - /* - * Advance snd_nxt over sequence space of this segment. - */ - if (flags & (TH_SYN|TH_FIN)) { - if (flags & TH_SYN) - tp->snd_nxt++; - if (flags & TH_FIN) { - tp->snd_nxt++; - tp->t_flags |= TF_SENTFIN; - } - } - tp->snd_nxt += len; - if (SEQ_GT(tp->snd_nxt, tp->snd_max)) { - tp->snd_max = tp->snd_nxt; - /* - * Time this transmission if not a retransmission and - * not currently timing anything. - */ - if (tp->t_rtt == 0) { - tp->t_rtt = 1; - tp->t_rtseq = startseq; - tcpstat.tcps_segstimed++; - } - } - - /* - * Set retransmit timer if not currently set, - * and not doing an ack or a keep-alive probe. - * Initial value for retransmit timer is smoothed - * round-trip time + 2 * round-trip time variance. - * Initialize shift counter which is used for backoff - * of retransmit time. - */ - if (tp->t_timer[TCPT_REXMT] == 0 && - tp->snd_nxt != tp->snd_una) { - tp->t_timer[TCPT_REXMT] = tp->t_rxtcur; - if (tp->t_timer[TCPT_PERSIST]) { - tp->t_timer[TCPT_PERSIST] = 0; - tp->t_rxtshift = 0; - } - } - } else - if (SEQ_GT(tp->snd_nxt + len, tp->snd_max)) - tp->snd_max = tp->snd_nxt + len; - -#ifdef TCPDEBUG - /* - * Trace. - */ - if (so->so_options & SO_DEBUG) - tcp_trace(TA_OUTPUT, tp->t_state, tp, ti, 0); -#endif - - /* - * Fill in IP length and desired time to live and - * send to IP level. There should be a better way - * to handle ttl and tos; we could keep them in - * the template, but need a way to checksum without them. - */ - m->m_pkthdr.len = hdrlen + len; -#ifdef TUBA - if (tp->t_tuba_pcb) - error = tuba_output(m, tp); - else -#endif - { -#if 1 - struct rtentry *rt; -#endif - ((struct ip *)ti)->ip_len = m->m_pkthdr.len; - ((struct ip *)ti)->ip_ttl = tp->t_inpcb->inp_ip_ttl; /* XXX */ - ((struct ip *)ti)->ip_tos = tp->t_inpcb->inp_ip_tos; /* XXX */ -#if 1 - /* - * See if we should do MTU discovery. We do it only if the following - * are true: - * 1) we have a valid route to the destination - * 2) the MTU is not locked (if it is, then discovery has been - * disabled) - */ - if ((rt = tp->t_inpcb->inp_route.ro_rt) - && rt->rt_flags & RTF_UP - && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { - ((struct ip *)ti)->ip_off |= IP_DF; - } -#endif - error = ip_output(m, tp->t_inpcb->inp_options, &tp->t_inpcb->inp_route, - so->so_options & SO_DONTROUTE, 0); - } - if (error) { -out: - if (error == ENOBUFS) { - tcp_quench(tp->t_inpcb, 0); - return (0); - } -#if 1 - if (error == EMSGSIZE) { - /* - * ip_output() will have already fixed the route - * for us. tcp_mtudisc() will, as its last action, - * initiate retransmission, so it is important to - * not do so here. - */ - tcp_mtudisc(tp->t_inpcb, 0); - return 0; - } -#endif - if ((error == EHOSTUNREACH || error == ENETDOWN) - && TCPS_HAVERCVDSYN(tp->t_state)) { - tp->t_softerror = error; - return (0); - } - return (error); - } - tcpstat.tcps_sndtotal++; - - /* - * Data sent (as far as we can tell). - * If this advertises a larger window than any other segment, - * then remember the size of the advertised window. - * Any pending ACK has now been sent. - */ - if (win > 0 && SEQ_GT(tp->rcv_nxt+win, tp->rcv_adv)) - tp->rcv_adv = tp->rcv_nxt + win; - tp->last_ack_sent = tp->rcv_nxt; - tp->t_flags &= ~(TF_ACKNOW|TF_DELACK); - if (sendalot) - goto again; - return (0); -} - -void -tcp_setpersist(tp) - register struct tcpcb *tp; -{ - register int t = ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1; - - if (tp->t_timer[TCPT_REXMT]) - panic("tcp_output REXMT"); - /* - * Start/restart persistance timer. - */ - TCPT_RANGESET(tp->t_timer[TCPT_PERSIST], - t * tcp_backoff[tp->t_rxtshift], - TCPTV_PERSMIN, TCPTV_PERSMAX); - if (tp->t_rxtshift < TCP_MAXRXTSHIFT) - tp->t_rxtshift++; -} -- cgit v1.2.3