* 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
+ * 3. 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.
*
/*
* Changes and additions relating to SLiRP
* Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
+ *
+ * Please read the file COPYRIGHT for the
* terms and conditions of the copyright.
*/
#include <slirp.h>
-#define max(x,y) ((x) > (y) ? (x) : (y))
-#define min(x,y) ((x) < (y) ? (x) : (y))
-
-/*
- * Since this is only used in "stats socket", we give meaning
- * names instead of the REAL names
- */
-char *tcpstates[] = {
-/* "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD", */
- "REDIRECT", "LISTEN", "SYN_SENT", "SYN_RCVD",
- "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
- "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",
-};
-
-u_char tcp_outflags[TCP_NSTATES] = {
+static const u_char tcp_outflags[TCP_NSTATES] = {
TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK,
- TH_ACK, TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK,
+ TH_ACK, TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK,
TH_FIN|TH_ACK, TH_ACK, TH_ACK,
};
+#undef MAX_TCPOPTLEN
#define MAX_TCPOPTLEN 32 /* max # bytes that go in options */
/*
* Tcp output routine: figure out what should be sent and send it.
*/
int
-tcp_output(tp)
- register struct tcpcb *tp;
+tcp_output(struct tcpcb *tp)
{
register struct socket *so = tp->t_socket;
register long len, win;
u_char opt[MAX_TCPOPTLEN];
unsigned optlen, hdrlen;
int idle, sendalot;
-
+
DEBUG_CALL("tcp_output");
DEBUG_ARG("tp = %lx", (long )tp);
-
+
/*
* Determine length of data that should be transmitted,
* and flags that will be used.
win = min(tp->snd_wnd, tp->snd_cwnd);
flags = tcp_outflags[tp->t_state];
-
+
DEBUG_MISC((dfd, " --- tcp_output flags = 0x%x\n",flags));
-
+
/*
* If in persist timeout with window of 0, send 1 byte.
* Otherwise, if window is small but nonzero
tp->snd_nxt = tp->snd_una;
}
}
-
+
if (len > tp->t_maxseg) {
len = tp->t_maxseg;
sendalot = 1;
* 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.
/*
* No reason to send a segment, just return.
*/
- tcpstat.tcps_didnuttin++;
-
return (0);
send:
if (flags & TH_SYN) {
tp->snd_nxt = tp->iss;
if ((tp->t_flags & TF_NOOPT) == 0) {
- u_int16_t mss;
+ uint16_t mss;
opt[0] = TCPOPT_MAXSEG;
opt[1] = 4;
- mss = htons((u_int16_t) tcp_mss(tp, 0));
+ mss = htons((uint16_t) tcp_mss(tp, 0));
memcpy((caddr_t)(opt + 2), (caddr_t)&mss, sizeof(mss));
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;
-
+
/*
* Adjust data length if insertion of options will
* bump the packet length beyond the t_maxseg length.
* 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;
- }
-
- m = m_get();
+ m = m_get(so->slirp);
if (m == NULL) {
-/* error = ENOBUFS; */
error = 1;
goto out;
}
- m->m_data += if_maxlinkhdr;
+ m->m_data += IF_MAXLINKHDR;
m->m_len = hdrlen;
-
- /*
- * This will always succeed, since we make sure our mbufs
- * are big enough to hold one MSS packet + header + ... etc.
- */
-/* if (len <= MHLEN - hdrlen - max_linkhdr) { */
- sbcopy(&so->so_snd, off, (int) len, mtod(m, caddr_t) + hdrlen);
- m->m_len += len;
+ sbcopy(&so->so_snd, 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)
- * len = 0;
- * }
- */
/*
* If we're sending everything we've got, set PUSH.
* (This will keep happy those implementations which only
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++;
-
- m = m_get();
+ m = m_get(so->slirp);
if (m == NULL) {
-/* error = ENOBUFS; */
error = 1;
goto out;
}
- m->m_data += if_maxlinkhdr;
+ m->m_data += IF_MAXLINKHDR;
m->m_len = hdrlen;
}
ti = mtod(m, struct tcpiphdr *);
-
+
memcpy((caddr_t)ti, &tp->t_template, sizeof (struct tcpiphdr));
/*
* 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 &&
+ if (flags & TH_FIN && tp->t_flags & TF_SENTFIN &&
tp->snd_nxt == tp->snd_max)
tp->snd_nxt--;
/*
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));
-
+ ti->ti_win = htons((uint16_t) (win>>tp->rcv_scale));
+
if (SEQ_GT(tp->snd_up, tp->snd_una)) {
- ti->ti_urp = htons((u_int16_t)(tp->snd_up - ntohl(ti->ti_seq)));
-#ifdef notdef
- if (SEQ_GT(tp->snd_up, tp->snd_nxt)) {
- ti->ti_urp = htons((u_int16_t)(tp->snd_up - tp->snd_nxt));
-#endif
+ ti->ti_urp = htons((uint16_t)(tp->snd_up - ntohl(ti->ti_seq)));
ti->ti_flags |= TH_URG;
} else
/*
* checksum extended header and data.
*/
if (len + optlen)
- ti->ti_len = htons((u_int16_t)(sizeof (struct tcphdr) +
+ ti->ti_len = htons((uint16_t)(sizeof (struct tcphdr) +
optlen + len));
ti->ti_sum = cksum(m, (int)(hdrlen + len));
if (tp->t_rtt == 0) {
tp->t_rtt = 1;
tp->t_rtseq = startseq;
- tcpstat.tcps_segstimed++;
}
}
* the template, but need a way to checksum without them.
*/
m->m_len = hdrlen + len; /* XXX Needed? m_len should be correct */
-
+
{
-
+
((struct ip *)ti)->ip_len = m->m_len;
- ((struct ip *)ti)->ip_ttl = ip_defttl;
+ ((struct ip *)ti)->ip_ttl = IPDEFTTL;
((struct ip *)ti)->ip_tos = so->so_iptos;
-
-/* #if BSD >= 43 */
- /* Don't do IP options... */
-/* error = ip_output(m, tp->t_inpcb->inp_options, &tp->t_inpcb->inp_route,
- * so->so_options & SO_DONTROUTE, 0);
- */
- error = ip_output(so, m);
-/* #else
- * error = ip_output(m, (struct mbuf *)0, &tp->t_inpcb->inp_route,
- * so->so_options & SO_DONTROUTE);
- * #endif
- */
+ error = ip_output(so, m);
}
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++;
/*
* Data sent (as far as we can tell).
}
void
-tcp_setpersist(tp)
- register struct tcpcb *tp;
+tcp_setpersist(struct tcpcb *tp)
{
int t = ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1;
-/* if (tp->t_timer[TCPT_REXMT])
- * panic("tcp_output REXMT");
- */
/*
* Start/restart persistence timer.
*/
projects / qemu.git / blobdiff