* 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>
#include "ip_icmp.h"
-struct socket tcb;
-
-int tcprexmtthresh = 3;
-struct socket *tcp_last_so = &tcb;
-
-tcp_seq tcp_iss; /* tcp initial send seq # */
+#define TCPREXMTTHRESH 3
#define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * PR_SLOWHZ)
#ifdef TCP_ACK_HACK
#define TCP_REASS(tp, ti, m, so, flags) {\
if ((ti)->ti_seq == (tp)->rcv_nxt && \
- (tp)->seg_next == (tcpiphdrp_32)(tp) && \
+ tcpfrag_list_empty(tp) && \
(tp)->t_state == TCPS_ESTABLISHED) {\
if (ti->ti_flags & TH_PUSH) \
tp->t_flags |= TF_ACKNOW; \
tp->t_flags |= TF_DELACK; \
(tp)->rcv_nxt += (ti)->ti_len; \
flags = (ti)->ti_flags & TH_FIN; \
- tcpstat.tcps_rcvpack++;\
- tcpstat.tcps_rcvbyte += (ti)->ti_len;\
if (so->so_emu) { \
if (tcp_emu((so),(m))) sbappend((so), (m)); \
} else \
sbappend((so), (m)); \
-/* sorwakeup(so); */ \
} else {\
(flags) = tcp_reass((tp), (ti), (m)); \
tp->t_flags |= TF_ACKNOW; \
#else
#define TCP_REASS(tp, ti, m, so, flags) { \
if ((ti)->ti_seq == (tp)->rcv_nxt && \
- (tp)->seg_next == (tcpiphdrp_32)(tp) && \
+ tcpfrag_list_empty(tp) && \
(tp)->t_state == TCPS_ESTABLISHED) { \
tp->t_flags |= TF_DELACK; \
(tp)->rcv_nxt += (ti)->ti_len; \
flags = (ti)->ti_flags & TH_FIN; \
- tcpstat.tcps_rcvpack++;\
- tcpstat.tcps_rcvbyte += (ti)->ti_len;\
if (so->so_emu) { \
if (tcp_emu((so),(m))) sbappend(so, (m)); \
} else \
sbappend((so), (m)); \
-/* sorwakeup(so); */ \
} else { \
(flags) = tcp_reass((tp), (ti), (m)); \
tp->t_flags |= TF_ACKNOW; \
} \
}
#endif
+static void tcp_dooptions(struct tcpcb *tp, u_char *cp, int cnt,
+ struct tcpiphdr *ti);
+static void tcp_xmit_timer(register struct tcpcb *tp, int rtt);
-int
-tcp_reass(tp, ti, m)
- register struct tcpcb *tp;
- register struct tcpiphdr *ti;
- struct mbuf *m;
+static int
+tcp_reass(register struct tcpcb *tp, register struct tcpiphdr *ti,
+ struct mbuf *m)
{
register struct tcpiphdr *q;
struct socket *so = tp->t_socket;
int flags;
-
+
/*
- * Call with ti==0 after become established to
+ * Call with ti==NULL after become established to
* force pre-ESTABLISHED data up to user socket.
*/
- if (ti == 0)
+ if (ti == NULL)
goto present;
/*
* Find a segment which begins after this one does.
*/
- for (q = (struct tcpiphdr *)tp->seg_next; q != (struct tcpiphdr *)tp;
- q = (struct tcpiphdr *)q->ti_next)
+ for (q = tcpfrag_list_first(tp); !tcpfrag_list_end(q, tp);
+ q = tcpiphdr_next(q))
if (SEQ_GT(q->ti_seq, ti->ti_seq))
break;
* our data already. If so, drop the data from the incoming
* segment. If it provides all of our data, drop us.
*/
- if ((struct tcpiphdr *)q->ti_prev != (struct tcpiphdr *)tp) {
+ if (!tcpfrag_list_end(tcpiphdr_prev(q), tp)) {
register int i;
- q = (struct tcpiphdr *)q->ti_prev;
+ q = tcpiphdr_prev(q);
/* conversion to int (in i) handles seq wraparound */
i = q->ti_seq + q->ti_len - ti->ti_seq;
if (i > 0) {
if (i >= ti->ti_len) {
- tcpstat.tcps_rcvduppack++;
- tcpstat.tcps_rcvdupbyte += ti->ti_len;
- m_freem(m);
+ m_free(m);
/*
* Try to present any queued data
* at the left window edge to the user.
ti->ti_len -= i;
ti->ti_seq += i;
}
- q = (struct tcpiphdr *)(q->ti_next);
+ q = tcpiphdr_next(q);
}
- tcpstat.tcps_rcvoopack++;
- tcpstat.tcps_rcvoobyte += ti->ti_len;
- REASS_MBUF(ti) = (mbufp_32) m; /* XXX */
+ ti->ti_mbuf = m;
/*
* While we overlap succeeding segments trim them or,
* if they are completely covered, dequeue them.
*/
- while (q != (struct tcpiphdr *)tp) {
+ while (!tcpfrag_list_end(q, tp)) {
register int i = (ti->ti_seq + ti->ti_len) - q->ti_seq;
if (i <= 0)
break;
if (i < q->ti_len) {
q->ti_seq += i;
q->ti_len -= i;
- m_adj((struct mbuf *) REASS_MBUF(q), i);
+ m_adj(q->ti_mbuf, i);
break;
}
- q = (struct tcpiphdr *)q->ti_next;
- m = (struct mbuf *) REASS_MBUF((struct tcpiphdr *)q->ti_prev);
- remque_32((void *)(q->ti_prev));
- m_freem(m);
+ q = tcpiphdr_next(q);
+ m = tcpiphdr_prev(q)->ti_mbuf;
+ remque(tcpiphdr2qlink(tcpiphdr_prev(q)));
+ m_free(m);
}
/*
* Stick new segment in its place.
*/
- insque_32(ti, (void *)(q->ti_prev));
+ insque(tcpiphdr2qlink(ti), tcpiphdr2qlink(tcpiphdr_prev(q)));
present:
/*
*/
if (!TCPS_HAVEESTABLISHED(tp->t_state))
return (0);
- ti = (struct tcpiphdr *) tp->seg_next;
- if (ti == (struct tcpiphdr *)tp || ti->ti_seq != tp->rcv_nxt)
+ ti = tcpfrag_list_first(tp);
+ if (tcpfrag_list_end(ti, tp) || ti->ti_seq != tp->rcv_nxt)
return (0);
if (tp->t_state == TCPS_SYN_RECEIVED && ti->ti_len)
return (0);
do {
tp->rcv_nxt += ti->ti_len;
flags = ti->ti_flags & TH_FIN;
- remque_32(ti);
- m = (struct mbuf *) REASS_MBUF(ti); /* XXX */
- ti = (struct tcpiphdr *)ti->ti_next;
-/* if (so->so_state & SS_FCANTRCVMORE) */
+ remque(tcpiphdr2qlink(ti));
+ m = ti->ti_mbuf;
+ ti = tcpiphdr_next(ti);
if (so->so_state & SS_FCANTSENDMORE)
- m_freem(m);
+ m_free(m);
else {
if (so->so_emu) {
if (tcp_emu(so,m)) sbappend(so, m);
sbappend(so, m);
}
} while (ti != (struct tcpiphdr *)tp && ti->ti_seq == tp->rcv_nxt);
-/* sorwakeup(so); */
return (flags);
}
* protocol specification dated September, 1981 very closely.
*/
void
-tcp_input(m, iphlen, inso)
- register struct mbuf *m;
- int iphlen;
- struct socket *inso;
+tcp_input(struct mbuf *m, int iphlen, struct socket *inso)
{
struct ip save_ip, *ip;
register struct tcpiphdr *ti;
caddr_t optp = NULL;
int optlen = 0;
int len, tlen, off;
- register struct tcpcb *tp = 0;
+ register struct tcpcb *tp = NULL;
register int tiflags;
- struct socket *so = 0;
+ struct socket *so = NULL;
int todrop, acked, ourfinisacked, needoutput = 0;
-/* int dropsocket = 0; */
int iss = 0;
u_long tiwin;
int ret;
-/* int ts_present = 0; */
+ struct ex_list *ex_ptr;
+ Slirp *slirp;
DEBUG_CALL("tcp_input");
- DEBUG_ARGS((dfd," m = %8lx iphlen = %2d inso = %lx\n",
+ DEBUG_ARGS((dfd, " m = %8lx iphlen = %2d inso = %lx\n",
(long )m, iphlen, (long )inso ));
-
+
/*
* If called with m == 0, then we're continuing the connect
*/
if (m == NULL) {
so = inso;
-
+ slirp = so->slirp;
+
/* Re-set a few variables */
tp = sototcpcb(so);
m = so->so_m;
- so->so_m = 0;
+ so->so_m = NULL;
ti = so->so_ti;
tiwin = ti->ti_win;
tiflags = ti->ti_flags;
-
+
goto cont_conn;
}
-
-
- tcpstat.tcps_rcvtotal++;
+ slirp = m->slirp;
+
/*
* Get IP and TCP header together in first mbuf.
* Note: IP leaves IP header in first mbuf.
iphlen=sizeof(struct ip );
}
/* XXX Check if too short */
-
+
/*
* Save a copy of the IP header in case we want restore it
* for sending an ICMP error message in response.
*/
ip=mtod(m, struct ip *);
- save_ip = *ip;
+ save_ip = *ip;
save_ip.ip_len+= iphlen;
/*
* Checksum extended TCP header and data.
*/
tlen = ((struct ip *)ti)->ip_len;
- ti->ti_next = ti->ti_prev = 0;
+ tcpiphdr2qlink(ti)->next = tcpiphdr2qlink(ti)->prev = NULL;
+ memset(&ti->ti_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
ti->ti_x1 = 0;
- ti->ti_len = htons((u_int16_t)tlen);
+ ti->ti_len = htons((uint16_t)tlen);
len = sizeof(struct ip ) + tlen;
- /* keep checksum for ICMP reply
- * ti->ti_sum = cksum(m, len);
- * if (ti->ti_sum) { */
if(cksum(m, len)) {
- tcpstat.tcps_rcvbadsum++;
goto drop;
}
*/
off = ti->ti_off << 2;
if (off < sizeof (struct tcphdr) || off > tlen) {
- tcpstat.tcps_rcvbadoff++;
goto drop;
}
tlen -= off;
if (off > sizeof (struct tcphdr)) {
optlen = off - sizeof (struct tcphdr);
optp = mtod(m, caddr_t) + sizeof (struct tcpiphdr);
-
- /*
- * Do quick retrieval of timestamp options ("options
- * prediction?"). If timestamp is the only option and it's
- * formatted as recommended in RFC 1323 appendix A, we
- * quickly get the values now and not bother calling
- * tcp_dooptions(), etc.
- */
-/* if ((optlen == TCPOLEN_TSTAMP_APPA ||
- * (optlen > TCPOLEN_TSTAMP_APPA &&
- * optp[TCPOLEN_TSTAMP_APPA] == TCPOPT_EOL)) &&
- * *(u_int32_t *)optp == htonl(TCPOPT_TSTAMP_HDR) &&
- * (ti->ti_flags & TH_SYN) == 0) {
- * ts_present = 1;
- * ts_val = ntohl(*(u_int32_t *)(optp + 4));
- * ts_ecr = ntohl(*(u_int32_t *)(optp + 8));
- * optp = NULL; / * we've parsed the options * /
- * }
- */
}
tiflags = ti->ti_flags;
-
+
/*
* Convert TCP protocol specific fields to host format.
*/
*/
m->m_data += sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);
m->m_len -= sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);
-
+
/*
* Locate pcb for segment.
*/
findso:
- so = tcp_last_so;
+ so = slirp->tcp_last_so;
if (so->so_fport != ti->ti_dport ||
so->so_lport != ti->ti_sport ||
so->so_laddr.s_addr != ti->ti_src.s_addr ||
so->so_faddr.s_addr != ti->ti_dst.s_addr) {
- so = solookup(&tcb, ti->ti_src, ti->ti_sport,
+ so = solookup(&slirp->tcb, ti->ti_src, ti->ti_sport,
ti->ti_dst, ti->ti_dport);
if (so)
- tcp_last_so = so;
- ++tcpstat.tcps_socachemiss;
+ slirp->tcp_last_so = so;
}
/*
* but should either do a listen or a connect soon.
*
* state == CLOSED means we've done socreate() but haven't
- * attached it to a protocol yet...
- *
+ * attached it to a protocol yet...
+ *
* XXX If a TCB does not exist, and the TH_SYN flag is
* the only flag set, then create a session, mark it
* as if it was LISTENING, and continue...
*/
- if (so == 0) {
+ if (so == NULL) {
+ if (slirp->restricted) {
+ /* Any hostfwds will have an existing socket, so we only get here
+ * for non-hostfwd connections. These should be dropped, unless it
+ * happens to be a guestfwd.
+ */
+ for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
+ if (ex_ptr->ex_fport == ti->ti_dport &&
+ ti->ti_dst.s_addr == ex_ptr->ex_addr.s_addr) {
+ break;
+ }
+ }
+ if (!ex_ptr) {
+ goto dropwithreset;
+ }
+ }
+
if ((tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) != TH_SYN)
goto dropwithreset;
-
- if ((so = socreate()) == NULL)
+
+ if ((so = socreate(slirp)) == NULL)
goto dropwithreset;
if (tcp_attach(so) < 0) {
free(so); /* Not sofree (if it failed, it's not insqued) */
goto dropwithreset;
}
-
- sbreserve(&so->so_snd, tcp_sndspace);
- sbreserve(&so->so_rcv, tcp_rcvspace);
-
- /* tcp_last_so = so; */ /* XXX ? */
- /* tp = sototcpcb(so); */
-
+
+ sbreserve(&so->so_snd, TCP_SNDSPACE);
+ sbreserve(&so->so_rcv, TCP_RCVSPACE);
+
so->so_laddr = ti->ti_src;
so->so_lport = ti->ti_sport;
so->so_faddr = ti->ti_dst;
so->so_fport = ti->ti_dport;
-
+
if ((so->so_iptos = tcp_tos(so)) == 0)
so->so_iptos = ((struct ip *)ti)->ip_tos;
-
+
tp = sototcpcb(so);
tp->t_state = TCPS_LISTEN;
}
-
+
/*
* If this is a still-connecting socket, this probably
* a retransmit of the SYN. Whether it's a retransmit SYN
goto drop;
tp = sototcpcb(so);
-
+
/* XXX Should never fail */
- if (tp == 0)
+ if (tp == NULL)
goto dropwithreset;
if (tp->t_state == TCPS_CLOSED)
goto drop;
-
- /* Unscale the window into a 32-bit value. */
-/* if ((tiflags & TH_SYN) == 0)
- * tiwin = ti->ti_win << tp->snd_scale;
- * else
- */
- tiwin = ti->ti_win;
+
+ tiwin = ti->ti_win;
/*
* Segment received on connection.
* Reset idle time and keep-alive timer.
*/
tp->t_idle = 0;
- if (so_options)
- tp->t_timer[TCPT_KEEP] = tcp_keepintvl;
+ if (SO_OPTIONS)
+ tp->t_timer[TCPT_KEEP] = TCPTV_KEEPINTVL;
else
- tp->t_timer[TCPT_KEEP] = tcp_keepidle;
+ tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_IDLE;
/*
* Process options if not in LISTEN state,
* else do it below (after getting remote address).
*/
if (optp && tp->t_state != TCPS_LISTEN)
- tcp_dooptions(tp, (u_char *)optp, optlen, ti);
-/* , */
-/* &ts_present, &ts_val, &ts_ecr); */
+ tcp_dooptions(tp, (u_char *)optp, optlen, ti);
- /*
+ /*
* Header prediction: check for the two common cases
* of a uni-directional data xfer. If the packet has
* no control flags, is in-sequence, the window didn't
*/
if (tp->t_state == TCPS_ESTABLISHED &&
(tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) == TH_ACK &&
-/* (!ts_present || TSTMP_GEQ(ts_val, tp->ts_recent)) && */
ti->ti_seq == tp->rcv_nxt &&
tiwin && tiwin == tp->snd_wnd &&
tp->snd_nxt == tp->snd_max) {
- /*
- * If last ACK falls within this segment's sequence numbers,
- * record the timestamp.
- */
-/* if (ts_present && SEQ_LEQ(ti->ti_seq, tp->last_ack_sent) &&
- * SEQ_LT(tp->last_ack_sent, ti->ti_seq + ti->ti_len)) {
- * tp->ts_recent_age = tcp_now;
- * tp->ts_recent = ts_val;
- * }
- */
if (ti->ti_len == 0) {
if (SEQ_GT(ti->ti_ack, tp->snd_una) &&
SEQ_LEQ(ti->ti_ack, tp->snd_max) &&
/*
* this is a pure ack for outstanding data.
*/
- ++tcpstat.tcps_predack;
-/* if (ts_present)
- * tcp_xmit_timer(tp, tcp_now-ts_ecr+1);
- * else
- */ if (tp->t_rtt &&
- SEQ_GT(ti->ti_ack, tp->t_rtseq))
+ if (tp->t_rtt &&
+ SEQ_GT(ti->ti_ack, tp->t_rtseq))
tcp_xmit_timer(tp, tp->t_rtt);
acked = ti->ti_ack - tp->snd_una;
- tcpstat.tcps_rcvackpack++;
- tcpstat.tcps_rcvackbyte += acked;
sbdrop(&so->so_snd, acked);
tp->snd_una = ti->ti_ack;
- m_freem(m);
+ m_free(m);
/*
* If all outstanding data are acked, stop
else if (tp->t_timer[TCPT_PERSIST] == 0)
tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
- /*
- * There's room in so_snd, sowwakup will read()
- * from the socket if we can
- */
-/* if (so->so_snd.sb_flags & SB_NOTIFY)
- * sowwakeup(so);
- */
- /*
+ /*
* This is called because sowwakeup might have
* put data into so_snd. Since we don't so sowwakeup,
* we don't need this.. XXX???
return;
}
} else if (ti->ti_ack == tp->snd_una &&
- tp->seg_next == (tcpiphdrp_32)tp &&
+ tcpfrag_list_empty(tp) &&
ti->ti_len <= sbspace(&so->so_rcv)) {
/*
* this is a pure, in-sequence data packet
* with nothing on the reassembly queue and
* we have enough buffer space to take it.
*/
- ++tcpstat.tcps_preddat;
tp->rcv_nxt += ti->ti_len;
- tcpstat.tcps_rcvpack++;
- tcpstat.tcps_rcvbyte += ti->ti_len;
/*
* Add data to socket buffer.
*/
if (tcp_emu(so,m)) sbappend(so, m);
} else
sbappend(so, m);
-
- /*
- * XXX This is called when data arrives. Later, check
- * if we can actually write() to the socket
- * XXX Need to check? It's be NON_BLOCKING
- */
-/* sorwakeup(so); */
-
+
/*
* If this is a short packet, then ACK now - with Nagel
* congestion avoidance sender won't send more until
* he gets an ACK.
- *
- * Here are 3 interpretations of what should happen.
- * The best (for me) is to delay-ack everything except
- * if it's a one-byte packet containing an ESC
- * (this means it's an arrow key (or similar) sent using
- * Nagel, hence there will be no echo)
- * The first of these is the original, the second is the
- * middle ground between the other 2
- */
-/* if (((unsigned)ti->ti_len < tp->t_maxseg)) {
- */
-/* if (((unsigned)ti->ti_len < tp->t_maxseg &&
- * (so->so_iptos & IPTOS_LOWDELAY) == 0) ||
- * ((so->so_iptos & IPTOS_LOWDELAY) &&
- * ((struct tcpiphdr_2 *)ti)->first_char == (char)27)) {
- */
- if ((unsigned)ti->ti_len == 1 &&
- ((struct tcpiphdr_2 *)ti)->first_char == (char)27) {
- tp->t_flags |= TF_ACKNOW;
- tcp_output(tp);
- } else {
- tp->t_flags |= TF_DELACK;
- }
+ *
+ * It is better to not delay acks at all to maximize
+ * TCP throughput. See RFC 2581.
+ */
+ tp->t_flags |= TF_ACKNOW;
+ tcp_output(tp);
return;
}
} /* header prediction */
goto dropwithreset;
if ((tiflags & TH_SYN) == 0)
goto drop;
-
+
/*
* This has way too many gotos...
* But a bit of spaghetti code never hurt anybody :)
*/
-
+
/*
* If this is destined for the control address, then flag to
* tcp_ctl once connected, otherwise connect
*/
- if ((so->so_faddr.s_addr&htonl(0xffffff00)) == special_addr.s_addr) {
- int lastbyte=ntohl(so->so_faddr.s_addr) & 0xff;
- if (lastbyte!=CTL_ALIAS && lastbyte!=CTL_DNS) {
-#if 0
- if(lastbyte==CTL_CMD || lastbyte==CTL_EXEC) {
- /* Command or exec adress */
- so->so_state |= SS_CTL;
- } else
-#endif
- {
+ if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
+ slirp->vnetwork_addr.s_addr) {
+ if (so->so_faddr.s_addr != slirp->vhost_addr.s_addr &&
+ so->so_faddr.s_addr != slirp->vnameserver_addr.s_addr) {
/* May be an add exec */
- struct ex_list *ex_ptr;
- for(ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
- if(ex_ptr->ex_fport == so->so_fport &&
- lastbyte == ex_ptr->ex_addr) {
+ for (ex_ptr = slirp->exec_list; ex_ptr;
+ ex_ptr = ex_ptr->ex_next) {
+ if(ex_ptr->ex_fport == so->so_fport &&
+ so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr) {
so->so_state |= SS_CTL;
break;
}
}
- }
- if(so->so_state & SS_CTL) goto cont_input;
+ if (so->so_state & SS_CTL) {
+ goto cont_input;
+ }
}
/* CTL_ALIAS: Do nothing, tcp_fconnect will be called on it */
}
-
+
if (so->so_emu & EMU_NOCONNECT) {
so->so_emu &= ~EMU_NOCONNECT;
goto cont_input;
}
-
- if(tcp_fconnect(so) == -1 && errno != EINPROGRESS) {
+
+ if((tcp_fconnect(so) == -1) && (errno != EINPROGRESS) && (errno != EWOULDBLOCK)) {
u_char code=ICMP_UNREACH_NET;
- DEBUG_MISC((dfd," tcp fconnect errno = %d-%s\n",
+ DEBUG_MISC((dfd, " tcp fconnect errno = %d-%s\n",
errno,strerror(errno)));
if(errno == ECONNREFUSED) {
/* ACK the SYN, send RST to refuse the connection */
tcp_respond(tp, ti, m, ti->ti_seq+1, (tcp_seq)0,
- TH_RST|TH_ACK);
+ TH_RST|TH_ACK);
} else {
if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
HTONL(ti->ti_seq); /* restore tcp header */
*ip=save_ip;
icmp_error(m, ICMP_UNREACH,code, 0,strerror(errno));
}
- tp = tcp_close(tp);
+ tcp_close(tp);
m_free(m);
} else {
/*
so->so_ti = ti;
tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
tp->t_state = TCPS_SYN_RECEIVED;
+ tcp_template(tp);
}
return;
- cont_conn:
- /* m==NULL
+ cont_conn:
+ /* m==NULL
* Check if the connect succeeded
*/
if (so->so_state & SS_NOFDREF) {
tp = tcp_close(tp);
goto dropwithreset;
}
- cont_input:
+ cont_input:
tcp_template(tp);
-
+
if (optp)
tcp_dooptions(tp, (u_char *)optp, optlen, ti);
- /* , */
- /* &ts_present, &ts_val, &ts_ecr); */
-
+
if (iss)
tp->iss = iss;
- else
- tp->iss = tcp_iss;
- tcp_iss += TCP_ISSINCR/2;
+ else
+ tp->iss = slirp->tcp_iss;
+ slirp->tcp_iss += TCP_ISSINCR/2;
tp->irs = ti->ti_seq;
tcp_sendseqinit(tp);
tcp_rcvseqinit(tp);
tp->t_flags |= TF_ACKNOW;
tp->t_state = TCPS_SYN_RECEIVED;
tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
- tcpstat.tcps_accepts++;
goto trimthenstep6;
} /* case TCPS_LISTEN */
-
+
/*
* If the state is SYN_SENT:
* if seg contains an ACK, but not for our SYN, drop the input.
goto dropwithreset;
if (tiflags & TH_RST) {
- if (tiflags & TH_ACK)
- tp = tcp_drop(tp,0); /* XXX Check t_softerror! */
+ if (tiflags & TH_ACK) {
+ tcp_drop(tp, 0); /* XXX Check t_softerror! */
+ }
goto drop;
}
tcp_rcvseqinit(tp);
tp->t_flags |= TF_ACKNOW;
if (tiflags & TH_ACK && SEQ_GT(tp->snd_una, tp->iss)) {
- tcpstat.tcps_connects++;
soisfconnected(so);
tp->t_state = TCPS_ESTABLISHED;
-
- /* Do window scaling on this connection? */
-/* if ((tp->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) ==
- * (TF_RCVD_SCALE|TF_REQ_SCALE)) {
- * tp->snd_scale = tp->requested_s_scale;
- * tp->rcv_scale = tp->request_r_scale;
- * }
- */
+
(void) tcp_reass(tp, (struct tcpiphdr *)0,
(struct mbuf *)0);
/*
m_adj(m, -todrop);
ti->ti_len = tp->rcv_wnd;
tiflags &= ~TH_FIN;
- tcpstat.tcps_rcvpackafterwin++;
- tcpstat.tcps_rcvbyteafterwin += todrop;
}
tp->snd_wl1 = ti->ti_seq - 1;
tp->rcv_up = ti->ti_seq;
} /* switch tp->t_state */
/*
* States other than LISTEN or SYN_SENT.
- * First check timestamp, if present.
- * Then check that at least some bytes of segment are within
+ * Check that at least some bytes of segment are within
* receive window. If segment begins before rcv_nxt,
* drop leading data (and SYN); if nothing left, just ack.
- *
- * RFC 1323 PAWS: If we have a timestamp reply on this segment
- * and it's less than ts_recent, drop it.
*/
-/* if (ts_present && (tiflags & TH_RST) == 0 && tp->ts_recent &&
- * TSTMP_LT(ts_val, tp->ts_recent)) {
- *
- */ /* Check to see if ts_recent is over 24 days old. */
-/* if ((int)(tcp_now - tp->ts_recent_age) > TCP_PAWS_IDLE) {
- */ /*
- * * Invalidate ts_recent. If this segment updates
- * * ts_recent, the age will be reset later and ts_recent
- * * will get a valid value. If it does not, setting
- * * ts_recent to zero will at least satisfy the
- * * requirement that zero be placed in the timestamp
- * * echo reply when ts_recent isn't valid. The
- * * age isn't reset until we get a valid ts_recent
- * * because we don't want out-of-order segments to be
- * * dropped when ts_recent is old.
- * */
-/* tp->ts_recent = 0;
- * } else {
- * tcpstat.tcps_rcvduppack++;
- * tcpstat.tcps_rcvdupbyte += ti->ti_len;
- * tcpstat.tcps_pawsdrop++;
- * goto dropafterack;
- * }
- * }
- */
-
todrop = tp->rcv_nxt - ti->ti_seq;
if (todrop > 0) {
if (tiflags & TH_SYN) {
tiflags &= ~TH_SYN;
ti->ti_seq++;
- if (ti->ti_urp > 1)
+ if (ti->ti_urp > 1)
ti->ti_urp--;
else
tiflags &= ~TH_URG;
* of sequence; drop it.
*/
tiflags &= ~TH_FIN;
-
+
/*
* Send an ACK to resynchronize and drop any data.
* But keep on processing for RST or ACK.
*/
tp->t_flags |= TF_ACKNOW;
todrop = ti->ti_len;
- tcpstat.tcps_rcvduppack++;
- tcpstat.tcps_rcvdupbyte += todrop;
- } else {
- tcpstat.tcps_rcvpartduppack++;
- tcpstat.tcps_rcvpartdupbyte += todrop;
}
m_adj(m, todrop);
ti->ti_seq += todrop;
if ((so->so_state & SS_NOFDREF) &&
tp->t_state > TCPS_CLOSE_WAIT && ti->ti_len) {
tp = tcp_close(tp);
- tcpstat.tcps_rcvafterclose++;
goto dropwithreset;
}
*/
todrop = (ti->ti_seq+ti->ti_len) - (tp->rcv_nxt+tp->rcv_wnd);
if (todrop > 0) {
- tcpstat.tcps_rcvpackafterwin++;
if (todrop >= ti->ti_len) {
- tcpstat.tcps_rcvbyteafterwin += ti->ti_len;
/*
* If a new connection request is received
* while in TIME_WAIT, drop the old connection
*/
if (tp->rcv_wnd == 0 && ti->ti_seq == tp->rcv_nxt) {
tp->t_flags |= TF_ACKNOW;
- tcpstat.tcps_rcvwinprobe++;
- } else
+ } else {
goto dropafterack;
- } else
- tcpstat.tcps_rcvbyteafterwin += todrop;
+ }
+ }
m_adj(m, -todrop);
ti->ti_len -= todrop;
tiflags &= ~(TH_PUSH|TH_FIN);
}
- /*
- * If last ACK falls within this segment's sequence numbers,
- * record its timestamp.
- */
-/* if (ts_present && SEQ_LEQ(ti->ti_seq, tp->last_ack_sent) &&
- * SEQ_LT(tp->last_ack_sent, ti->ti_seq + ti->ti_len +
- * ((tiflags & (TH_SYN|TH_FIN)) != 0))) {
- * tp->ts_recent_age = tcp_now;
- * tp->ts_recent = ts_val;
- * }
- */
-
/*
* If the RST bit is set examine the state:
* SYN_RECEIVED STATE:
if (tiflags&TH_RST) switch (tp->t_state) {
case TCPS_SYN_RECEIVED:
-/* so->so_error = ECONNREFUSED; */
- goto close;
-
case TCPS_ESTABLISHED:
case TCPS_FIN_WAIT_1:
case TCPS_FIN_WAIT_2:
case TCPS_CLOSE_WAIT:
-/* so->so_error = ECONNRESET; */
- close:
tp->t_state = TCPS_CLOSED;
- tcpstat.tcps_drops++;
- tp = tcp_close(tp);
+ tcp_close(tp);
goto drop;
case TCPS_CLOSING:
case TCPS_LAST_ACK:
case TCPS_TIME_WAIT:
- tp = tcp_close(tp);
+ tcp_close(tp);
goto drop;
}
if (SEQ_GT(tp->snd_una, ti->ti_ack) ||
SEQ_GT(ti->ti_ack, tp->snd_max))
goto dropwithreset;
- tcpstat.tcps_connects++;
tp->t_state = TCPS_ESTABLISHED;
- /*
- * The sent SYN is ack'ed with our sequence number +1
- * The first data byte already in the buffer will get
+ /*
+ * The sent SYN is ack'ed with our sequence number +1
+ * The first data byte already in the buffer will get
* lost if no correction is made. This is only needed for
* SS_CTL since the buffer is empty otherwise.
- * tp->snd_una++; or:
+ * tp->snd_una++; or:
*/
tp->snd_una=ti->ti_ack;
if (so->so_state & SS_CTL) {
soisfconnected(so);
so->so_state &= ~SS_CTL; /* success XXX */
} else if (ret == 2) {
- so->so_state = SS_NOFDREF; /* CTL_CMD */
+ so->so_state &= SS_PERSISTENT_MASK;
+ so->so_state |= SS_NOFDREF; /* CTL_CMD */
} else {
needoutput = 1;
tp->t_state = TCPS_FIN_WAIT_1;
} else {
soisfconnected(so);
}
-
- /* Do window scaling? */
-/* if ((tp->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) ==
- * (TF_RCVD_SCALE|TF_REQ_SCALE)) {
- * tp->snd_scale = tp->requested_s_scale;
- * tp->rcv_scale = tp->request_r_scale;
- * }
- */
+
(void) tcp_reass(tp, (struct tcpiphdr *)0, (struct mbuf *)0);
tp->snd_wl1 = ti->ti_seq - 1;
/* Avoid ack processing; snd_una==ti_ack => dup ack */
if (SEQ_LEQ(ti->ti_ack, tp->snd_una)) {
if (ti->ti_len == 0 && tiwin == tp->snd_wnd) {
- tcpstat.tcps_rcvdupack++;
- DEBUG_MISC((dfd," dup ack m = %lx so = %lx \n",
+ DEBUG_MISC((dfd, " dup ack m = %lx so = %lx\n",
(long )m, (long )so));
/*
* If we have outstanding data (other than
* the new ssthresh).
*
* Dup acks mean that packets have left the
- * network (they're now cached at the receiver)
+ * network (they're now cached at the receiver)
* so bump cwnd by the amount in the receiver
* to keep a constant cwnd packets in the
* network.
if (tp->t_timer[TCPT_REXMT] == 0 ||
ti->ti_ack != tp->snd_una)
tp->t_dupacks = 0;
- else if (++tp->t_dupacks == tcprexmtthresh) {
+ else if (++tp->t_dupacks == TCPREXMTTHRESH) {
tcp_seq onxt = tp->snd_nxt;
u_int win =
min(tp->snd_wnd, tp->snd_cwnd) / 2 /
if (SEQ_GT(onxt, tp->snd_nxt))
tp->snd_nxt = onxt;
goto drop;
- } else if (tp->t_dupacks > tcprexmtthresh) {
+ } else if (tp->t_dupacks > TCPREXMTTHRESH) {
tp->snd_cwnd += tp->t_maxseg;
(void) tcp_output(tp);
goto drop;
* If the congestion window was inflated to account
* for the other side's cached packets, retract it.
*/
- if (tp->t_dupacks > tcprexmtthresh &&
+ if (tp->t_dupacks > TCPREXMTTHRESH &&
tp->snd_cwnd > tp->snd_ssthresh)
tp->snd_cwnd = tp->snd_ssthresh;
tp->t_dupacks = 0;
if (SEQ_GT(ti->ti_ack, tp->snd_max)) {
- tcpstat.tcps_rcvacktoomuch++;
goto dropafterack;
}
acked = ti->ti_ack - tp->snd_una;
- tcpstat.tcps_rcvackpack++;
- tcpstat.tcps_rcvackbyte += acked;
/*
- * If we have a timestamp reply, update smoothed
- * round trip time. If no timestamp is present but
- * transmit timer is running and timed sequence
+ * If transmit timer is running and timed sequence
* number was acked, update smoothed round trip time.
* Since we now have an rtt measurement, cancel the
* timer backoff (cf., Phil Karn's retransmit alg.).
* Recompute the initial retransmit timer.
*/
-/* if (ts_present)
- * tcp_xmit_timer(tp, tcp_now-ts_ecr+1);
- * else
- */
- if (tp->t_rtt && SEQ_GT(ti->ti_ack, tp->t_rtseq))
+ if (tp->t_rtt && SEQ_GT(ti->ti_ack, tp->t_rtseq))
tcp_xmit_timer(tp,tp->t_rtt);
/*
tp->snd_wnd -= acked;
ourfinisacked = 0;
}
- /*
- * XXX sowwakup is called when data is acked and there's room for
- * for more data... it should read() the socket
- */
-/* if (so->so_snd.sb_flags & SB_NOTIFY)
- * sowwakeup(so);
- */
tp->snd_una = ti->ti_ack;
if (SEQ_LT(tp->snd_nxt, tp->snd_una))
tp->snd_nxt = tp->snd_una;
* we'll hang forever.
*/
if (so->so_state & SS_FCANTRCVMORE) {
- soisfdisconnected(so);
- tp->t_timer[TCPT_2MSL] = tcp_maxidle;
+ tp->t_timer[TCPT_2MSL] = TCP_MAXIDLE;
}
tp->t_state = TCPS_FIN_WAIT_2;
}
tp->t_state = TCPS_TIME_WAIT;
tcp_canceltimers(tp);
tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
- soisfdisconnected(so);
}
break;
*/
case TCPS_LAST_ACK:
if (ourfinisacked) {
- tp = tcp_close(tp);
+ tcp_close(tp);
goto drop;
}
break;
* Don't look at window if no ACK: TAC's send garbage on first SYN.
*/
if ((tiflags & TH_ACK) &&
- (SEQ_LT(tp->snd_wl1, ti->ti_seq) ||
+ (SEQ_LT(tp->snd_wl1, ti->ti_seq) ||
(tp->snd_wl1 == ti->ti_seq && (SEQ_LT(tp->snd_wl2, ti->ti_ack) ||
(tp->snd_wl2 == ti->ti_ack && tiwin > tp->snd_wnd))))) {
- /* keep track of pure window updates */
- if (ti->ti_len == 0 &&
- tp->snd_wl2 == ti->ti_ack && tiwin > tp->snd_wnd)
- tcpstat.tcps_rcvwinupd++;
tp->snd_wnd = tiwin;
tp->snd_wl1 = ti->ti_seq;
tp->snd_wl2 = ti->ti_ack;
* If this segment advances the known urgent pointer,
* then mark the data stream. This should not happen
* in CLOSE_WAIT, CLOSING, LAST_ACK or TIME_WAIT STATES since
- * a FIN has been received from the remote side.
+ * a FIN has been received from the remote side.
* In these states we ignore the URG.
*
* According to RFC961 (Assigned Protocols),
* the urgent pointer points to the last octet
* of urgent data. We continue, however,
* to consider it to indicate the first octet
- * of data past the urgent section as the original
+ * of data past the urgent section as the original
* spec states (in one of two places).
*/
if (SEQ_GT(ti->ti_seq+ti->ti_urp, tp->rcv_up)) {
so->so_urgc = so->so_rcv.sb_cc +
(tp->rcv_up - tp->rcv_nxt); /* -1; */
tp->rcv_up = ti->ti_seq + ti->ti_urp;
-
+
}
} else
/*
tp->rcv_up = tp->rcv_nxt;
dodata:
+ /*
+ * If this is a small packet, then ACK now - with Nagel
+ * congestion avoidance sender won't send more until
+ * he gets an ACK.
+ */
+ if (ti->ti_len && (unsigned)ti->ti_len <= 5 &&
+ ((struct tcpiphdr_2 *)ti)->first_char == (char)27) {
+ tp->t_flags |= TF_ACKNOW;
+ }
+
/*
* Process the segment text, merging it into the TCP sequencing queue,
* and arranging for acknowledgment of receipt if necessary.
if ((ti->ti_len || (tiflags&TH_FIN)) &&
TCPS_HAVERCVDFIN(tp->t_state) == 0) {
TCP_REASS(tp, ti, m, so, tiflags);
- /*
- * Note the amount of data that peer has sent into
- * our window, in order to estimate the sender's
- * buffer size.
- */
- len = so->so_rcv.sb_datalen - (tp->rcv_adv - tp->rcv_nxt);
} else {
m_free(m);
tiflags &= ~TH_FIN;
* will got to TCPS_LAST_ACK, and use tcp_output()
* to send the FIN.
*/
-/* sofcantrcvmore(so); */
sofwdrain(so);
-
+
tp->t_flags |= TF_ACKNOW;
tp->rcv_nxt++;
}
case TCPS_ESTABLISHED:
if(so->so_emu == EMU_CTL) /* no shutdown on socket */
tp->t_state = TCPS_LAST_ACK;
- else
+ else
tp->t_state = TCPS_CLOSE_WAIT;
break;
/*
* In FIN_WAIT_2 state enter the TIME_WAIT state,
- * starting the time-wait timer, turning off the other
+ * starting the time-wait timer, turning off the other
* standard timers.
*/
case TCPS_FIN_WAIT_2:
tp->t_state = TCPS_TIME_WAIT;
tcp_canceltimers(tp);
tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
- soisfdisconnected(so);
break;
/*
}
}
- /*
- * If this is a small packet, then ACK now - with Nagel
- * congestion avoidance sender won't send more until
- * he gets an ACK.
- *
- * See above.
- */
-/* if (ti->ti_len && (unsigned)ti->ti_len < tp->t_maxseg) {
- */
-/* if ((ti->ti_len && (unsigned)ti->ti_len < tp->t_maxseg &&
- * (so->so_iptos & IPTOS_LOWDELAY) == 0) ||
- * ((so->so_iptos & IPTOS_LOWDELAY) &&
- * ((struct tcpiphdr_2 *)ti)->first_char == (char)27)) {
- */
- if (ti->ti_len && (unsigned)ti->ti_len <= 5 &&
- ((struct tcpiphdr_2 *)ti)->first_char == (char)27) {
- tp->t_flags |= TF_ACKNOW;
- }
-
/*
* Return any desired output.
*/
*/
if (tiflags & TH_RST)
goto drop;
- m_freem(m);
+ m_free(m);
tp->t_flags |= TF_ACKNOW;
(void) tcp_output(tp);
return;
* Drop space held by incoming segment and return.
*/
m_free(m);
-
- return;
}
- /* , ts_present, ts_val, ts_ecr) */
-/* int *ts_present;
- * u_int32_t *ts_val, *ts_ecr;
- */
-void
-tcp_dooptions(tp, cp, cnt, ti)
- struct tcpcb *tp;
- u_char *cp;
- int cnt;
- struct tcpiphdr *ti;
+static void
+tcp_dooptions(struct tcpcb *tp, u_char *cp, int cnt, struct tcpiphdr *ti)
{
- u_int16_t mss;
+ uint16_t mss;
int opt, optlen;
DEBUG_CALL("tcp_dooptions");
- DEBUG_ARGS((dfd," tp = %lx cnt=%i \n", (long )tp, cnt));
+ DEBUG_ARGS((dfd, " tp = %lx cnt=%i\n", (long)tp, cnt));
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[0];
NTOHS(mss);
(void) tcp_mss(tp, mss); /* sets t_maxseg */
break;
-
-/* case TCPOPT_WINDOW:
- * if (optlen != TCPOLEN_WINDOW)
- * continue;
- * if (!(ti->ti_flags & TH_SYN))
- * continue;
- * tp->t_flags |= TF_RCVD_SCALE;
- * tp->requested_s_scale = min(cp[2], TCP_MAX_WINSHIFT);
- * break;
- */
-/* case TCPOPT_TIMESTAMP:
- * if (optlen != TCPOLEN_TIMESTAMP)
- * continue;
- * *ts_present = 1;
- * memcpy((char *) ts_val, (char *)cp + 2, sizeof(*ts_val));
- * NTOHL(*ts_val);
- * memcpy((char *) ts_ecr, (char *)cp + 6, sizeof(*ts_ecr));
- * NTOHL(*ts_ecr);
- *
- */ /*
- * * A timestamp received in a SYN makes
- * * it ok to send timestamp requests and replies.
- * */
-/* if (ti->ti_flags & TH_SYN) {
- * tp->t_flags |= TF_RCVD_TSTMP;
- * tp->ts_recent = *ts_val;
- * tp->ts_recent_age = tcp_now;
- * }
- */ break;
}
}
}
register struct mbuf *m;
{
int cnt = ti->ti_urp - 1;
-
+
while (cnt >= 0) {
if (m->m_len > cnt) {
char *cp = mtod(m, caddr_t) + cnt;
* and update averages and current timeout.
*/
-void
-tcp_xmit_timer(tp, rtt)
- register struct tcpcb *tp;
- int rtt;
+static void
+tcp_xmit_timer(register struct tcpcb *tp, int rtt)
{
register short delta;
DEBUG_CALL("tcp_xmit_timer");
DEBUG_ARG("tp = %lx", (long)tp);
DEBUG_ARG("rtt = %d", rtt);
-
- tcpstat.tcps_rttupdated++;
+
if (tp->t_srtt != 0) {
/*
* srtt is stored as fixed point with 3 bits after the
if ((tp->t_rttvar += delta) <= 0)
tp->t_rttvar = 1;
} else {
- /*
+ /*
* No rtt measurement yet - use the unsmoothed rtt.
* Set the variance to half the rtt (so our first
* retransmit happens at 3*rtt).
*/
TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp),
(short)tp->t_rttmin, TCPTV_REXMTMAX); /* XXX */
-
+
/*
* We received an ack for a packet that wasn't retransmitted;
* it is probably safe to discard any error indications we've
*/
int
-tcp_mss(tp, offer)
- register struct tcpcb *tp;
- u_int offer;
+tcp_mss(struct tcpcb *tp, u_int offer)
{
struct socket *so = tp->t_socket;
int mss;
-
+
DEBUG_CALL("tcp_mss");
DEBUG_ARG("tp = %lx", (long)tp);
DEBUG_ARG("offer = %d", offer);
-
- mss = min(if_mtu, if_mru) - sizeof(struct tcpiphdr);
+
+ mss = min(IF_MTU, IF_MRU) - sizeof(struct tcpiphdr);
if (offer)
mss = min(mss, offer);
mss = max(mss, 32);
if (mss < tp->t_maxseg || offer != 0)
tp->t_maxseg = mss;
-
+
tp->snd_cwnd = mss;
-
- sbreserve(&so->so_snd, tcp_sndspace+((tcp_sndspace%mss)?(mss-(tcp_sndspace%mss)):0));
- sbreserve(&so->so_rcv, tcp_rcvspace+((tcp_rcvspace%mss)?(mss-(tcp_rcvspace%mss)):0));
-
+
+ sbreserve(&so->so_snd, TCP_SNDSPACE + ((TCP_SNDSPACE % mss) ?
+ (mss - (TCP_SNDSPACE % mss)) :
+ 0));
+ sbreserve(&so->so_rcv, TCP_RCVSPACE + ((TCP_RCVSPACE % mss) ?
+ (mss - (TCP_RCVSPACE % mss)) :
+ 0));
+
DEBUG_MISC((dfd, " returning mss = %d\n", mss));
-
+
return mss;
}
projects / qemu.git / blobdiff