Attachment 183566 Details for Bug 220076 – protect ng_iface private data

[patch] protect ng_iface private data

ng_iface.c.diff (text/plain), 2.26 KB, created by Eugene Grosbein on 2017-06-17 08:44:42 UTC

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Creator: Eugene Grosbein

Created: 2017-06-17 08:44:42 UTC

Size: 2.26 KB

patch

obsolete

>--- sys/netgraph/ng_iface.c.orig	2017-02-15 13:05:35.564006000 +0700
>+++ sys/netgraph/ng_iface.c	2017-06-17 04:41:46.200314000 +0700
>@@ -112,9 +112,15 @@ struct ng_iface_private {
> 	int	unit;			/* Interface unit number */
> 	node_p	node;			/* Our netgraph node */
> 	hook_p	hooks[NUM_FAMILIES];	/* Hook for each address family */
>+	struct rwlock	lock;		/* Protect private data changes */
> };
> typedef struct ng_iface_private *priv_p;
> 
>+#define	PRIV_RLOCK(priv)	rw_rlock(&priv->lock)
>+#define	PRIV_RUNLOCK(priv)	rw_runlock(&priv->lock)
>+#define	PRIV_WLOCK(priv)	rw_wlock(&priv->lock)
>+#define	PRIV_WUNLOCK(priv)	rw_wunlock(&priv->lock)
>+
> /* Interface methods */
> static void	ng_iface_start(struct ifnet *ifp);
> static int	ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
>@@ -448,7 +454,9 @@ ng_iface_send(struct ifnet *ifp, struct 
> 
> 	/* Send packet. If hook is not connected, mbuf will get freed. */
> 	NG_OUTBOUND_THREAD_REF();
>+	PRIV_RLOCK(priv);
> 	NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
>+	PRIV_RUNLOCK(priv);
> 	NG_OUTBOUND_THREAD_UNREF();
> 
> 	/* Update stats. */
>@@ -516,6 +524,8 @@ ng_iface_constructor(node_p node)
> 		return (ENOMEM);
> 	}
> 
>+	rw_init(&priv->lock, "ng_iface private mutex");
>+
> 	/* Link them together */
> 	ifp->if_softc = priv;
> 	priv->ifp = ifp;
>@@ -562,16 +572,19 @@ static int
> ng_iface_newhook(node_p node, hook_p hook, const char *name)
> {
> 	const iffam_p iffam = get_iffam_from_name(name);
>+	const priv_p priv = NG_NODE_PRIVATE(node);
> 	hook_p *hookptr;
> 
> 	if (iffam == NULL)
> 		return (EPFNOSUPPORT);
>-	hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
>+	PRIV_WLOCK(priv);
>+	hookptr = get_hook_from_iffam(priv, iffam);
> 	if (*hookptr != NULL)
> 		return (EISCONN);
> 	*hookptr = hook;
> 	NG_HOOK_HI_STACK(hook);
> 	NG_HOOK_SET_TO_INBOUND(hook);
>+	PRIV_WUNLOCK(priv);
> 	return (0);
> }
> 
>@@ -730,6 +743,7 @@ ng_iface_shutdown(node_p node)
> 	CURVNET_RESTORE();
> 	priv->ifp = NULL;
> 	free_unr(V_ng_iface_unit, priv->unit);
>+	rw_destroy(&priv->lock);
> 	free(priv, M_NETGRAPH_IFACE);
> 	NG_NODE_SET_PRIVATE(node, NULL);
> 	NG_NODE_UNREF(node);
>@@ -748,7 +762,9 @@ ng_iface_disconnect(hook_p hook)
> 
> 	if (iffam == NULL)
> 		panic("%s", __func__);
>+	PRIV_WLOCK(priv);
> 	*get_hook_from_iffam(priv, iffam) = NULL;
>+	PRIV_WUNLOCK(priv);
> 	return (0);
> }
>

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Attachments on bug 220076: 183566 | 183625 | 183627 | 184119 | 186781