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The syncache has made use of TCPDEBUG problematic, because the SYN

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segments are lost for the application. This broke, for example,
ports/benchmarks/dbs which needs the SYN segment to filter the
contents of the trace buffer for the connection it is interested in.

This patch makes the SYN segments available again. Unfortunately they
are now associated with the listening socket instead of the new one, so
a change to applications is required, but without this patch it wouldn't
work altogether.

PR:		kern/45966
This commit is contained in:
Hartmut Brandt 2003-08-13 10:20:57 +00:00
parent 91f467d592
commit a9ca5bdbd0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=118864
1 changed files with 41 additions and 0 deletions
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41
sys/netinet/tcp_syncache.c
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@ -37,6 +37,7 @@
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_mac.h"
#include "opt_tcpdebug.h"
#include <sys/param.h>
#include <sys/systm.h>
@ -68,10 +69,16 @@
#include <netinet6/in6_pcb.h>
#endif
#include <netinet/tcp.h>
#ifdef TCPDEBUG
#include <netinet/tcpip.h>
#endif
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#ifdef TCPDEBUG
#include <netinet/tcp_debug.h>
#endif
#ifdef INET6
#include <netinet6/tcp6_var.h>
#endif
@ -104,7 +111,11 @@ static void syncache_drop(struct syncache *, struct syncache_head *);
static void syncache_free(struct syncache *);
static void syncache_insert(struct syncache *, struct syncache_head *);
struct syncache *syncache_lookup(struct in_conninfo *, struct syncache_head **);
#ifdef TCPDEBUG
static int syncache_respond(struct syncache *, struct mbuf *, struct socket *);
#else
static int syncache_respond(struct syncache *, struct mbuf *);
#endif
static struct socket *syncache_socket(struct syncache *, struct socket *,
struct mbuf *m);
static void syncache_timer(void *);
@ -397,7 +408,11 @@ syncache_timer(xslot)
* to modify another entry, so do not obtain the next
* entry on the timer chain until it has completed.
*/
#ifdef TCPDEBUG
(void) syncache_respond(sc, NULL, NULL);
#else
(void) syncache_respond(sc, NULL);
#endif
nsc = TAILQ_NEXT(sc, sc_timerq);
tcpstat.tcps_sc_retransmitted++;
TAILQ_REMOVE(&tcp_syncache.timerq[slot], sc, sc_timerq);
@ -870,7 +885,11 @@ syncache_add(inc, to, th, sop, m)
*/
sc->sc_tp = tp;
sc->sc_inp_gencnt = tp->t_inpcb->inp_gencnt;
#ifdef TCPDEBUG
if (syncache_respond(sc, m, so) == 0) {
#else
if (syncache_respond(sc, m) == 0) {
#endif
s = splnet();
TAILQ_REMOVE(&tcp_syncache.timerq[sc->sc_rxtslot],
sc, sc_timerq);
@ -1027,7 +1046,11 @@ syncache_add(inc, to, th, sop, m)
* TAO test failed or there was no CC option,
* do a standard 3-way handshake.
*/
#ifdef TCPDEBUG
if (syncache_respond(sc, m, so) == 0) {
#else
if (syncache_respond(sc, m) == 0) {
#endif
syncache_insert(sc, sch);
tcpstat.tcps_sndacks++;
tcpstat.tcps_sndtotal++;
@ -1039,10 +1062,18 @@ syncache_add(inc, to, th, sop, m)
return (1);
}
#ifdef TCPDEBUG
static int
syncache_respond(sc, m, so)
struct syncache *sc;
struct mbuf *m;
struct socket *so;
#else
static int
syncache_respond(sc, m)
struct syncache *sc;
struct mbuf *m;
#endif
{
u_int8_t *optp;
int optlen, error;
@ -1217,6 +1248,16 @@ syncache_respond(sc, m)
htons(tlen - hlen + IPPROTO_TCP));
m->m_pkthdr.csum_flags = CSUM_TCP;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
#ifdef TCPDEBUG
/*
* Trace.
*/
if (so != NULL && so->so_options & SO_DEBUG) {
struct tcpcb *tp = sototcpcb(so);
tcp_trace(TA_OUTPUT, tp->t_state, tp,
mtod(m, void *), th, 0);
}
#endif
error = ip_output(m, sc->sc_ipopts, &sc->sc_route, 0, NULL,
sc->sc_tp->t_inpcb);
}