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NetBSD/sys/netinet/tcp_output.c

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/* $NetBSD: tcp_output.c,v 1.47 1999/01/20 03:39:54 thorpej Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe and Kevin M. Lahey 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, 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
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#define TCPOUTFLAGS
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_debug.h>
#ifdef notyet
extern struct mbuf *m_copypack();
#endif
#define MAX_TCPOPTLEN 32 /* max # bytes that go in options */
/*
* Knob to enable Congestion Window Monitoring, and control the
* the burst size it allows. Default burst is 4 packets, per
* the Internet draft.
*/
int tcp_cwm = 0;
int tcp_cwm_burstsize = 4;
static __inline void tcp_segsize __P((struct tcpcb *, int *, int *));
static __inline void
tcp_segsize(tp, txsegsizep, rxsegsizep)
struct tcpcb *tp;
int *txsegsizep, *rxsegsizep;
{
struct inpcb *inp = tp->t_inpcb;
struct rtentry *rt;
struct ifnet *ifp;
int size;
if ((rt = in_pcbrtentry(inp)) == NULL) {
size = tcp_mssdflt;
goto out;
}
ifp = rt->rt_ifp;
if (rt->rt_rmx.rmx_mtu != 0)
size = rt->rt_rmx.rmx_mtu - sizeof(struct tcpiphdr);
else if (ip_mtudisc || in_localaddr(inp->inp_faddr) ||
ifp->if_flags & IFF_LOOPBACK)
size = ifp->if_mtu - sizeof(struct tcpiphdr);
else
size = tcp_mssdflt;
size -= (tcp_optlen(tp) + ip_optlen(tp->t_inpcb));
out:
*txsegsizep = min(tp->t_peermss, size);
*rxsegsizep = min(tp->t_ourmss, size);
if (*txsegsizep != tp->t_segsz) {
/*
* If the new segment size is larger, we don't want to
* mess up the congestion window, but if it is smaller
* we'll have to reduce the congestion window to ensure
* that we don't get into trouble with initial windows
* and the rest. In any case, if the segment size
* has changed, chances are the path has, too, and
* our congestion window will be different.
*/
if (*txsegsizep < tp->t_segsz) {
tp->snd_cwnd = max((tp->snd_cwnd / tp->t_segsz)
* *txsegsizep, *txsegsizep);
tp->snd_ssthresh = max((tp->snd_ssthresh / tp->t_segsz)
* *txsegsizep, *txsegsizep);
}
tp->t_segsz = *txsegsizep;
}
}
/*
* Tcp output routine: figure out what should be sent and send it.
*/
int
tcp_output(tp)
register struct tcpcb *tp;
{
struct socket *so = tp->t_inpcb->inp_socket;
struct route *ro = &tp->t_inpcb->inp_route;
struct rtentry *rt;
struct sockaddr_in *dst;
long len, win;
int off, flags, error;
register struct mbuf *m;
register struct tcpiphdr *ti;
u_char opt[MAX_TCPOPTLEN];
unsigned optlen, hdrlen;
int idle, sendalot, txsegsize, rxsegsize;
int maxburst = TCP_MAXBURST;
tcp_segsize(tp, &txsegsize, &rxsegsize);
idle = (tp->snd_max == tp->snd_una);
/*
* Restart Window computation. From draft-floyd-incr-init-win-03:
*
* Optionally, a TCP MAY set the restart window to the
* minimum of the value used for the initial window and
* the current value of cwnd (in other words, using a
* larger value for the restart window should never increase
* the size of cwnd).
*/
if (tcp_cwm) {
/*
* Hughes/Touch/Heidemann Congestion Window Monitoring.
* Count the number of packets currently pending
* acknowledgement, and limit our congestion window
* to a pre-determined allowed burst size plus that count.
* This prevents bursting once all pending packets have
* been acknowledged (i.e. transmission is idle).
*
* XXX Link this to Initial Window?
*/
tp->snd_cwnd = min(tp->snd_cwnd,
(tcp_cwm_burstsize * txsegsize) +
(tp->snd_nxt - tp->snd_una));
} else {
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 = min(tp->snd_cwnd,
TCP_INITIAL_WINDOW(tcp_init_win, txsegsize));
}
}
again:
/*
* Determine length of data that should be transmitted, and
* flags that should be used. If there is some data or critical
* controls (SYN, RST) to send, then transmit; otherwise,
* investigate further.
*/
sendalot = 0;
off = tp->snd_nxt - tp->snd_una;
win = min(tp->snd_wnd, tp->snd_cwnd);
flags = tcp_outflags[tp->t_state];
/*
* 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 {
TCP_TIMER_DISARM(tp, TCPT_PERSIST);
tp->t_rxtshift = 0;
}
}
if (win < so->so_snd.sb_cc) {
len = win - off;
flags &= ~TH_FIN;
} else
len = so->so_snd.sb_cc - off;
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.
*
* If we have a pending FIN, either it has already been
* transmitted or it is outside the window, so drop it.
* If the FIN has been transmitted, but this is not a
* retransmission, then len must be -1. Therefore we also
* prevent here the sending of `gratuitous FINs'. This
* eliminates the need to check for that case below (e.g.
* to back up snd_nxt before the FIN so that the sequence
* number is correct).
*/
len = 0;
flags &= ~TH_FIN;
if (win == 0) {
TCP_TIMER_DISARM(tp, TCPT_REXMT);
tp->t_rxtshift = 0;
tp->snd_nxt = tp->snd_una;
if (TCP_TIMER_ISARMED(tp, TCPT_PERSIST) == 0)
tcp_setpersist(tp);
}
}
if (len > txsegsize) {
len = txsegsize;
flags &= ~TH_FIN;
sendalot = 1;
}
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 == txsegsize)
goto send;
if ((so->so_state & SS_MORETOCOME) == 0 &&
((idle || tp->t_flags & TF_NODELAY) &&
len + off >= so->so_snd.sb_cc))
goto send;
if (tp->t_force)
goto send;
if (len >= tp->max_sndwnd / 2)
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 twice the size of the largest segment
* we expect to receive (i.e. two 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 * rxsegsize))
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_SYN|TH_FIN|TH_RST))
goto send;
if (SEQ_GT(tp->snd_up, 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 && TCP_TIMER_ISARMED(tp, TCPT_REXMT) == 0 &&
TCP_TIMER_ISARMED(tp, 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) {
struct rtentry *rt = in_pcbrtentry(tp->t_inpcb);
tp->snd_nxt = tp->iss;
tp->t_ourmss = tcp_mss_to_advertise(rt != NULL ?
rt->rt_ifp : NULL);
if ((tp->t_flags & TF_NOOPT) == 0) {
opt[0] = TCPOPT_MAXSEG;
opt[1] = 4;
opt[2] = (tp->t_ourmss >> 8) & 0xff;
opt[3] = tp->t_ourmss & 0xff;
optlen = 4;
if ((tp->t_flags & TF_REQ_SCALE) &&
((flags & TH_ACK) == 0 ||
(tp->t_flags & TF_RCVD_SCALE))) {
*((u_int32_t *) (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_SYN|TH_ACK)) == TH_SYN ||
(tp->t_flags & TF_RCVD_TSTMP))) {
u_int32_t *lp = (u_int32_t *)(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;
}
hdrlen += optlen;
#ifdef DIAGNOSTIC
if (len > txsegsize)
panic("tcp data to be sent is larger than segment");
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) {
m_freem(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");
bcopy((caddr_t)tp->t_template, (caddr_t)ti, sizeof (struct tcpiphdr));
/*
* 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)) ||
TCP_TIMER_ISARMED(tp, 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((caddr_t)opt, (caddr_t)(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)rxsegsize)
win = 0;
if (win > (long)TCP_MAXWIN << tp->rcv_scale)
win = (long)TCP_MAXWIN << tp->rcv_scale;
if (win < (long)(tp->rcv_adv - tp->rcv_nxt))
win = (long)(tp->rcv_adv - tp->rcv_nxt);
ti->ti_win = htons((u_int16_t) (win>>tp->rcv_scale));
if (SEQ_GT(tp->snd_up, tp->snd_nxt)) {
u_int32_t urp = tp->snd_up - tp->snd_nxt;
if (urp > IP_MAXPACKET)
urp = IP_MAXPACKET;
ti->ti_urp = htons((u_int16_t)urp);
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_int16_t)(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 || TCP_TIMER_ISARMED(tp, TCPT_PERSIST) == 0) {
tcp_seq startseq = tp->snd_nxt;
/*
* Advance snd_nxt over sequence space of this segment.
* There are no states in which we send both a SYN and a FIN,
* so we collapse the tests for these flags.
*/
if (flags & (TH_SYN|TH_FIN))
tp->snd_nxt++;
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 (TCP_TIMER_ISARMED(tp, TCPT_REXMT) == 0 &&
tp->snd_nxt != tp->snd_una) {
TCP_TIMER_ARM(tp, TCPT_REXMT, tp->t_rxtcur);
if (TCP_TIMER_ISARMED(tp, TCPT_PERSIST)) {
TCP_TIMER_DISARM(tp, TCPT_PERSIST);
tp->t_rxtshift = 0;
}
}
} else
if (SEQ_GT(tp->snd_nxt + len, tp->snd_max))
tp->snd_max = tp->snd_nxt + len;
/*
* Trace.
*/
if (so->so_options & SO_DEBUG)
tcp_trace(TA_OUTPUT, tp->t_state, tp, ti, 0);
/*
* 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;
((struct ip *)ti)->ip_len = m->m_pkthdr.len;
((struct ip *)ti)->ip_ttl = tp->t_inpcb->inp_ip.ip_ttl; /* XXX */
((struct ip *)ti)->ip_tos = tp->t_inpcb->inp_ip.ip_tos; /* XXX */
/*
* If we're doing Path MTU discovery, we need to set DF unless
* the route's MTU is locked. If we lack a route, we need to
* look it up now.
*
* ip_output() could do this for us, but it's convenient to just
* do it here unconditionally.
*/
if ((rt = ro->ro_rt) == NULL || (rt->rt_flags & RTF_UP) == 0) {
if (ro->ro_rt != NULL) {
RTFREE(ro->ro_rt);
ro->ro_rt = NULL;
}
dst = satosin(&ro->ro_dst);
dst->sin_family = AF_INET;
dst->sin_len = sizeof(*dst);
dst->sin_addr = tp->t_inpcb->inp_faddr;
rtalloc(ro);
if ((rt = ro->ro_rt) == NULL) {
m_freem(m);
ipstat.ips_noroute++;
error = EHOSTUNREACH;
goto out;
}
}
if (ip_mtudisc != 0 && (rt->rt_rmx.rmx_locks & RTV_MTU) == 0)
((struct ip *)ti)->ip_off |= IP_DF;
#if BSD >= 43
error = ip_output(m, tp->t_inpcb->inp_options, ro,
so->so_options & SO_DONTROUTE, 0);
#else
error = ip_output(m, (struct mbuf *)0, ro,
so->so_options & SO_DONTROUTE);
#endif
if (error) {
out:
if (error == ENOBUFS) {
tcp_quench(tp->t_inpcb, 0);
return (0);
}
if ((error == EHOSTUNREACH || error == ENETDOWN)
&& TCPS_HAVERCVDSYN(tp->t_state)) {
tp->t_softerror = error;
return (0);
}
return (error);
}
tcpstat.tcps_sndtotal++;
if (tp->t_flags & TF_DELACK)
tcpstat.tcps_delack++;
/*
* 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;
TCP_CLEAR_DELACK(tp);
#ifdef DIAGNOSTIC
if (maxburst < 0)
printf("tcp_output: maxburst exceeded by %d\n", -maxburst);
#endif
if (sendalot && (!tcp_do_newreno || --maxburst))
goto again;
return (0);
}
void
tcp_setpersist(tp)
register struct tcpcb *tp;
{
register int t = ((tp->t_srtt >> 2) + tp->t_rttvar) >> (1 + 2);
int nticks;
if (TCP_TIMER_ISARMED(tp, TCPT_REXMT))
panic("tcp_output REXMT");
/*
* Start/restart persistance timer.
*/
if (t < tp->t_rttmin)
t = tp->t_rttmin;
TCPT_RANGESET(nticks, t * tcp_backoff[tp->t_rxtshift],
TCPTV_PERSMIN, TCPTV_PERSMAX);
TCP_TIMER_ARM(tp, TCPT_PERSIST, nticks);
if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
tp->t_rxtshift++;
}
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