From b9948f6d7817578ac1916f841bafdc4234a311ce Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Fri, 2 Mar 2001 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2001-03-02

---
 ip/il.c    |  9 +++++++++
 ip/ipaux.c | 56 ++++++++++++++++++++++++++++++++++++++----------------
 2 files changed, 49 insertions(+), 16 deletions(-)

diff --git a/ip/il.c b/ip/il.c
index 17947d61201af7ea172652b2f0c2340617e3006e..2339a826f59ce44df1b49e45dd627727265c53fd 100644
--- a/ip/il.c
+++ b/ip/il.c
@@ -515,6 +515,7 @@ ilackto(Ilcb *ic, ulong ackto, Block *bp)
 		bp->list = nil;
 		ic->unackedbytes -= blocklen(bp);
 		freeblist(bp);
+		ic->rexmit = 0;
 		ilsettimeout(ic);
 	}
 	qunlock(&ic->ackq);
@@ -569,6 +570,8 @@ iliput(Proto *il, uchar*, Block *bp)
 	qlock(il);
 	s = iphtlook(&ipriv->ht, raddr, dp, laddr, sp);
 	if(s == nil){
+		if(ih->iltype == Ilsync)
+			ilreject(il->f, ih);		/* no listener */
 		qunlock(il);
 		goto raise;
 	}
@@ -653,6 +656,8 @@ _ilprocess(Conv *s, Ilhdr *h, Block *bp)
 				ic->rstart = id;
 				ilsendctl(s, nil, Ilack, ic->next, ic->recvd, 0);
 				ic->state = Ilestablished;
+				ic->fasttimeout = 0;
+				ic->rexmit = 0;
 				Fsconnected(s, nil);
 				ilpullup(s);
 			}
@@ -679,12 +684,16 @@ _ilprocess(Conv *s, Ilhdr *h, Block *bp)
 		case Ilack:
 			if(ack == ic->start) {
 				ic->state = Ilestablished;
+				ic->fasttimeout = 0;
+				ic->rexmit = 0;
 				ilpullup(s);
 			}
 			break;
 		case Ildata:
 			if(ack == ic->start) {
 				ic->state = Ilestablished;
+				ic->fasttimeout = 0;
+				ic->rexmit = 0;
 				goto established;
 			}
 			break;
diff --git a/ip/ipaux.c b/ip/ipaux.c
index c09811689b8c805d3a7bd02d8de351be37a5cac6..37f5538fa8c37d115f8fb535b5dc937c5690ef90 100644
--- a/ip/ipaux.c
+++ b/ip/ipaux.c
@@ -249,34 +249,57 @@ isv4(uchar *ip)
 	return memcmp(ip, v4prefix, IPv4off) == 0;
 }
 
-/* 
- *  since we call v4tov6 so often (per packet in), avoiding the memmove's is
- *  useful.  However, we need to check allignment for processors
- *  without unalligned moves.
+
+/*
+ *  the following routines are unrolled with no memset's to speed
+ *  up the usual case
  */
 void
 v4tov6(uchar *v6, uchar *v4)
 {
-	if((((ulong)v6) & 0x3) != 0 || (((ulong)v4) & 0x3) != 0){
-		memmove(v6, v4prefix, IPv4off);
-		memmove(v6 + IPv4off, v4, IPv4addrlen);
-	} else {
-		*(ulong*)v6 = *(ulong*)v4prefix;
-		*(ulong*)(v6+4) = *(ulong*)(v4prefix+4);
-		*(ulong*)(v6+8) = *(ulong*)(v4prefix+8);
-		*(ulong*)(v6+12) = *(ulong*)v4;
-	}
+	v6[0] = 0;
+	v6[1] = 0;
+	v6[2] = 0;
+	v6[3] = 0;
+	v6[4] = 0;
+	v6[5] = 0;
+	v6[6] = 0;
+	v6[7] = 0;
+	v6[8] = 0;
+	v6[9] = 0;
+	v6[10] = 0xff;
+	v6[11] = 0xff;
+	v6[12] = v4[0];
+	v6[13] = v4[1];
+	v6[14] = v4[2];
+	v6[15] = v4[3];
 }
 
 int
 v6tov4(uchar *v4, uchar *v6)
 {
-	if(memcmp(v6, v4prefix, IPv4off) != 0){
+	if(v6[0] == 0
+	&& v6[1] == 0
+	&& v6[2] == 0
+	&& v6[3] == 0
+	&& v6[4] == 0
+	&& v6[5] == 0
+	&& v6[6] == 0
+	&& v6[7] == 0
+	&& v6[8] == 0
+	&& v6[9] == 0
+	&& v6[10] == 0xff
+	&& v6[11] == 0xff)
+	{
+		v4[0] = v6[12];
+		v4[1] = v6[13];
+		v4[2] = v6[14];
+		v4[3] = v6[15];
+		return 0;
+	} else {
 		memset(v4, 0, 4);
 		return -1;
 	}
-	memmove(v4, v6 + IPv4off, IPv4addrlen);
-	return 0;
 }
 
 ulong
@@ -434,6 +457,7 @@ iphtadd(Ipht *ht, Conv *c)
 		}
 	}
 	h->c = c;
+
 	lock(ht);
 	h->next = ht->tab[hv];
 	ht->tab[hv] = h;