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authortholo <tholo@openbsd.org>1996-07-29 06:22:12 +0000
committertholo <tholo@openbsd.org>1996-07-29 06:22:12 +0000
commit32f9faca8b96dba6a8601f5c30bffc6aab6def65 (patch)
treef023e1243fae47379dcb26c49bb30522c88ede12 /sys/netinet/tcp_input.c
parentensure bindresvport() is told to find a port (diff)
downloadwireguard-openbsd-32f9faca8b96dba6a8601f5c30bffc6aab6def65.tar.xz
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Make TCP ISS increment by random amounts
Diffstat (limited to 'sys/netinet/tcp_input.c')
-rw-r--r--sys/netinet/tcp_input.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index 9db513df8dd..6b1e52774f8 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tcp_input.c,v 1.3 1996/03/03 22:30:45 niklas Exp $ */
+/* $OpenBSD: tcp_input.c,v 1.4 1996/07/29 06:22:12 tholo Exp $ */
/* $NetBSD: tcp_input.c,v 1.23 1996/02/13 23:43:44 christos Exp $ */
/*
@@ -243,6 +243,9 @@ tcp_input(m, va_alist)
register struct mbuf *m;
#endif
{
+#ifndef TCP_COMPAT_42
+ u_int random __P((void));
+#endif /* !TCP_COMPAT_42 */
register struct tcpiphdr *ti;
register struct inpcb *inp;
caddr_t optp = NULL;
@@ -619,7 +622,11 @@ findpcb:
tp->iss = iss;
else
tp->iss = tcp_iss;
+#ifdef TCP_COMPAT_42
tcp_iss += TCP_ISSINCR/2;
+#else /* TCP_COMPAT_42 */
+ tcp_iss += random() % (TCP_ISSINCR / 2) + 1;
+#endif /* !TCP_COMPAT_42 */
tp->irs = ti->ti_seq;
tcp_sendseqinit(tp);
tcp_rcvseqinit(tp);