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Close race between node being shutdown and socket being detached. To

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do this, obtain netgraph locking in detach method via ng_send_fn1().

Reviewed by:	julian
MFC after:	2 weeks
This commit is contained in:
Gleb Smirnoff 2005-05-16 17:25:49 +00:00
parent b4b485a5d8
commit 94b73ad3a9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=146290
1 changed files with 27 additions and 7 deletions
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34
sys/netgraph/ng_socket.c
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@ -122,7 +122,7 @@ static ng_disconnect_t ngs_disconnect;
static int ng_attach_data(struct socket *so);
static int ng_attach_cntl(struct socket *so);
static int ng_attach_common(struct socket *so, int type);
static void ng_detach_common(struct ngpcb *pcbp, int type);
static void ng_detach_common(node_p node, hook_p hook, void *arg1, int which);
/*static int ng_internalize(struct mbuf *m, struct thread *p); */
static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
@ -190,7 +190,16 @@ ngc_detach(struct socket *so)
if (pcbp == NULL)
return (EINVAL);
ng_detach_common(pcbp, NG_CONTROL);
/*
* If there is a node, then obtain netgraph locking first.
*/
if (pcbp->sockdata != NULL)
ng_send_fn1(pcbp->sockdata->node, NULL, &ng_detach_common,
pcbp, NG_CONTROL, NG_WAITOK);
else
ng_detach_common(NULL, NULL, pcbp, NG_CONTROL);
return (0);
}
@ -379,7 +388,16 @@ ngd_detach(struct socket *so)
if (pcbp == NULL)
return (EINVAL);
ng_detach_common(pcbp, NG_DATA);
/*
* If there is a node, then obtain netgraph locking first.
*/
if (pcbp->sockdata != NULL)
ng_send_fn1(pcbp->sockdata->node, NULL, &ng_detach_common,
pcbp, NG_DATA, NG_WAITOK);
else
ng_detach_common(NULL, NULL, pcbp, NG_DATA);
return (0);
}
@ -521,14 +539,14 @@ ng_attach_cntl(struct socket *so)
MALLOC(privdata, struct ngsock *,
sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
if (privdata == NULL) {
ng_detach_common(pcbp, NG_CONTROL);
ng_detach_common(NULL, NULL, pcbp, NG_CONTROL);
return (ENOMEM);
}
/* Make the generic node components */
if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
FREE(privdata, M_NETGRAPH_SOCK);
ng_detach_common(pcbp, NG_CONTROL);
ng_detach_common(NULL, NULL, pcbp, NG_CONTROL);
return (error);
}
NG_NODE_SET_PRIVATE(privdata->node, privdata);
@ -585,11 +603,13 @@ ng_attach_common(struct socket *so, int type)
* then shut down the entire node. Shared code for control and data sockets.
*/
static void
ng_detach_common(struct ngpcb *pcbp, int which)
ng_detach_common(node_p node, hook_p hook, void *arg1, int which)
{
struct ngsock *priv;
struct ngpcb *pcbp = arg1;
if (pcbp->sockdata) {
struct ngsock *priv;
priv = pcbp->sockdata;
pcbp->sockdata = NULL;
switch (which) {