From fa49e42d18a01013c958b6f08789a6ec7c4a02d0 Mon Sep 17 00:00:00 2001
From: archie <archie@FreeBSD.org>
Date: Fri, 19 Nov 1999 05:49:54 +0000
Subject: Fix bug where hook pointers were not getting updated on
 disconnection.

---
 sys/netgraph/ng_ppp.c | 22 ++++++++++++++++++----
 sys/netgraph/ng_vjc.c | 24 ++++++++++++++++++++----
 2 files changed, 38 insertions(+), 8 deletions(-)

(limited to 'sys')

diff --git a/sys/netgraph/ng_ppp.c b/sys/netgraph/ng_ppp.c
index b488889..169e65b 100644
--- a/sys/netgraph/ng_ppp.c
+++ b/sys/netgraph/ng_ppp.c
@@ -162,7 +162,7 @@ static const char *const ng_ppp_hook_names[] = {
 #define HOOK_INDEX(hook)	(*((int16_t *) &(hook)->private))
 
 /* Node private data */
-struct private {
+struct ng_ppp_private {
 	struct ng_ppp_node_config	conf;
 	struct ng_ppp_link_stat		bundleStats;
 	struct ng_ppp_link_stat		linkStats[NG_PPP_MAX_LINKS];
@@ -178,7 +178,7 @@ struct private {
 					frags;		/* incoming fragments */
 	int				mpSeqOut;	/* next out MP seq # */
 };
-typedef struct private *priv_p;
+typedef struct ng_ppp_private *priv_p;
 
 /* Netgraph node methods */
 static ng_constructor_t	ng_ppp_constructor;
@@ -625,7 +625,20 @@ ng_ppp_rmnode(node_p node)
 static int
 ng_ppp_disconnect(hook_p hook)
 {
-	if (hook->node->numhooks == 0)
+	const node_p node = hook->node;
+	const priv_p priv = node->private;
+	const int index = HOOK_INDEX(hook);
+
+	/* Zero out hook pointer */
+	if (index < 0)
+		priv->links[~index] = NULL;
+	else
+		priv->hooks[index] = NULL;
+
+	/* Update derived info (or go away if no hooks left) */
+	if (node->numhooks > 0)
+		ng_ppp_update(node, 0);
+	else
 		ng_rmnode(hook->node);
 	return (0);
 }
@@ -1062,7 +1075,8 @@ deliver:
 				meta2 = meta;
 
 			/* Send fragment */
-			error = ng_ppp_output(node, 0, PROT_MP, linkNum, m2, meta2);
+			error = ng_ppp_output(node, 0,
+			    PROT_MP, linkNum, m2, meta2);
 			if (error != 0) {
 				if (!lastFragment)
 					NG_FREE_DATA(m, meta);
diff --git a/sys/netgraph/ng_vjc.c b/sys/netgraph/ng_vjc.c
index 874a5bf..db96f1c 100644
--- a/sys/netgraph/ng_vjc.c
+++ b/sys/netgraph/ng_vjc.c
@@ -76,7 +76,7 @@
 #define MAX_VJHEADER		19
 
 /* Node private data */
-struct private {
+struct ng_vjc_private {
 	struct	ngm_vjc_config conf;
 	struct	slcompress slc;
 	hook_p	ip;
@@ -84,7 +84,7 @@ struct private {
 	hook_p	vjuncomp;
 	hook_p	vjip;
 };
-typedef struct private *priv_p;
+typedef struct ng_vjc_private *priv_p;
 
 #define ERROUT(x)	do { error = (x); goto done; } while (0)
 
@@ -414,8 +414,24 @@ ng_vjc_rmnode(node_p node)
 static int
 ng_vjc_disconnect(hook_p hook)
 {
-	if (hook->node->numhooks == 0)
-		ng_rmnode(hook->node);
+	const node_p node = hook->node;
+	const priv_p priv = node->private;
+
+	/* Zero out hook pointer */
+	if (hook == priv->ip)
+		priv->ip = NULL;
+	else if (hook == priv->vjcomp)
+		priv->vjcomp = NULL;
+	else if (hook == priv->vjuncomp)
+		priv->vjuncomp = NULL;
+	else if (hook == priv->vjip)
+		priv->vjip = NULL;
+	else
+		panic("%s: unknown hook", __FUNCTION__);
+
+	/* Go away if no hooks left */
+	if (node->numhooks == 0)
+		ng_rmnode(node);
 	return (0);
 }
 
-- 
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