From 134397184049e5410e84d7a45e38cf2f64a1b719 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 10 Jul 2001 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2001-07-10

---
 ip/ip.h        |  1 +
 ip/ipifc.c     |  6 ++++--
 ip/iproute.c   | 40 +++++++++++++++++++++++-----------------
 pc/clock.c     |  2 +-
 pc/uarti8250.c |  6 +++---
 5 files changed, 32 insertions(+), 23 deletions(-)

diff --git a/ip/ip.h b/ip/ip.h
index 590b79afb495396b13754363cb1acd04ca45ecf1..b89706b942c5a4566f65d04bb3fd5741073900fb 100644
--- a/ip/ip.h
+++ b/ip/ip.h
@@ -383,6 +383,7 @@ struct	RouteTree
 	uchar	ifcid;		/* must match ifc->id */
 	Ipifc	*ifc;
 	char	tag[4];
+	int	ref;
 };
 
 struct V4route
diff --git a/ip/ipifc.c b/ip/ipifc.c
index 09a0e0784ee57199a884996016ab943066ec20a6..4d5e03f869b6615deb5d667e30f34f22f347a8cc 100644
--- a/ip/ipifc.c
+++ b/ip/ipifc.c
@@ -405,9 +405,9 @@ ipifcadd(Ipifc *ifc, char **argv, int argc)
 		type |= Rptpt;
 	}
 	if(isv4(ip))
-		v4addroute(f, tifc, rem+IPv4off, mask+IPv4off, ip+IPv4off, type);
+		v4addroute(f, tifc, rem+IPv4off, mask+IPv4off, rem+IPv4off, type);
 	else
-		v6addroute(f, tifc, rem, mask, ip, type);
+		v6addroute(f, tifc, rem, mask, rem, type);
 
 	addselfcache(f, ifc, lifc, ip, Runi);
 
@@ -503,6 +503,8 @@ ipifcrem(Ipifc *ifc, char **argv, int argc, int dolock)
 		return "address not on this interface";
 	}
 
+	ifc->ifcid++;
+
 	/* disassociate any addresses */
 	while(lifc->link)
 		remselfcache(f, ifc, lifc, lifc->link->self->a);
diff --git a/ip/iproute.c b/ip/iproute.c
index bdbe5e691b51085fd895705b75d6391dcc984f30..c8603d66f75b43c24ab54b83d50cebb74327ee5b 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -57,6 +57,7 @@ allocroute(int type)
 	memset(r, 0, n);
 	r->type = type;
 	r->ifc = nil;
+	r->ref = 1;
 
 	return r;
 }
@@ -271,7 +272,8 @@ addnode(Fs *f, Route **cur, Route *new)
 			p->type = new->type;
 			p->ifcid = -1;
 			copygate(p, new);
-		}
+		} else if(new->type & Rifc)
+			p->ref++;
 		freeroute(new);
 		break;
 	case Rcontained:
@@ -404,15 +406,17 @@ v4delroute(Fs *f, uchar *a, uchar *mask, int dolock)
 		r = looknode(&f->v4root[h], &rt);
 		if(r) {
 			p = *r;
-			*r = 0;
-			addqueue(&f->queue, p->left);
-			addqueue(&f->queue, p->mid);
-			addqueue(&f->queue, p->right);
-			freeroute(p);
-			while(p = f->queue) {
-				f->queue = p->mid;
-				walkadd(f, &f->v4root[h], p->left);
+			if(--(p->ref) == 0){
+				*r = 0;
+				addqueue(&f->queue, p->left);
+				addqueue(&f->queue, p->mid);
+				addqueue(&f->queue, p->right);
 				freeroute(p);
+				while(p = f->queue) {
+					f->queue = p->mid;
+					walkadd(f, &f->v4root[h], p->left);
+					freeroute(p);
+				}
 			}
 		}
 		if(dolock)
@@ -445,15 +449,17 @@ v6delroute(Fs *f, uchar *a, uchar *mask, int dolock)
 		r = looknode(&f->v6root[h], &rt);
 		if(r) {
 			p = *r;
-			*r = 0;
-			addqueue(&f->queue, p->left);
-			addqueue(&f->queue, p->mid);
-			addqueue(&f->queue, p->right);
-			freeroute(p);
-			while(p = f->queue) {
-				f->queue = p->mid;
-				walkadd(f, &f->v6root[h], p->left);
+			if(--(p->ref) == 0){
+				*r = 0;
+				addqueue(&f->queue, p->left);
+				addqueue(&f->queue, p->mid);
+				addqueue(&f->queue, p->right);
 				freeroute(p);
+				while(p = f->queue) {
+					f->queue = p->mid;
+					walkadd(f, &f->v6root[h], p->left);
+					freeroute(p);
+				}
 			}
 		}
 		if(dolock)
diff --git a/pc/clock.c b/pc/clock.c
index a35b2309f0b8490a467dec259ce8859b1ef941b7..f7266088aca71cc0b9a5a2fe9baf83924c893f90 100644
--- a/pc/clock.c
+++ b/pc/clock.c
@@ -10,7 +10,7 @@ void
 clockintr(Ureg* ureg, void*)
 {
 	// this needs to be here for synchronizing mp clocks
-	// see mp.c's squidboy()
+	// see pc/mp.c's squidboy()
 	fastticks(nil);
 
 	if(m->flushmmu){
diff --git a/pc/uarti8250.c b/pc/uarti8250.c
index 22d0e33d5bdd008d360a5e965bd01e15804791f5..508df314b62ad4ec23d72df1266755e7890775a5 100644
--- a/pc/uarti8250.c
+++ b/pc/uarti8250.c
@@ -379,9 +379,9 @@ i8250baud(Uart* uart, int baud)
 	Ctlr *ctlr;
 
 	/*
-	 * Set the baudrate by calculating and setting the baudrate
-	 * generator constant. This will work with fairly non-standard
-	 * baudrates.
+	 * Set the Baud rate by calculating and setting the Baud rate
+	 * Generator Constant. This will work with fairly non-standard
+	 * Baud rates.
 	 */
 	if(uart->freq == 0 || baud <= 0)
 		return -1;