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RPCSEC_GSS: Share rpc_pipes when an rpc_clnt owns multiple rpcsec auth caches

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Ensure that if an rpc_clnt owns more than one RPCSEC_GSS-based authentication
mechanism, then those caches will share the same 'gssd' upcall pipe.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2013-08-27 16:52:16 -04:00
parent 298fc3558b
commit 414a629598
1 changed files with 68 additions and 9 deletions
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77
net/sunrpc/auth_gss/auth_gss.c
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@ -76,6 +76,7 @@ struct gss_pipe {
struct rpc_pipe *pipe;
struct rpc_clnt *clnt;
const char *name;
struct kref kref;
};
struct gss_auth {
@ -832,7 +833,6 @@ static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
const char *name,
const struct rpc_pipe_ops *upcall_ops)
{
struct net *net = rpc_net_ns(clnt);
struct gss_pipe *p;
int err = -ENOMEM;
@ -846,19 +846,71 @@ static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
}
p->name = name;
p->clnt = clnt;
kref_init(&p->kref);
rpc_init_pipe_dir_object(&p->pdo,
&gss_pipe_dir_object_ops,
p);
err = rpc_add_pipe_dir_object(net, &clnt->cl_pipedir_objects, &p->pdo);
if (!err)
return p;
rpc_destroy_pipe_data(p->pipe);
return p;
err_free_gss_pipe:
kfree(p);
err:
return ERR_PTR(err);
}
struct gss_alloc_pdo {
struct rpc_clnt *clnt;
const char *name;
const struct rpc_pipe_ops *upcall_ops;
};
static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
{
struct gss_pipe *gss_pipe;
struct gss_alloc_pdo *args = data;
if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
return 0;
gss_pipe = container_of(pdo, struct gss_pipe, pdo);
if (strcmp(gss_pipe->name, args->name) != 0)
return 0;
if (!kref_get_unless_zero(&gss_pipe->kref))
return 0;
return 1;
}
static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
{
struct gss_pipe *gss_pipe;
struct gss_alloc_pdo *args = data;
gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
if (!IS_ERR(gss_pipe))
return &gss_pipe->pdo;
return NULL;
}
static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
const char *name,
const struct rpc_pipe_ops *upcall_ops)
{
struct net *net = rpc_net_ns(clnt);
struct rpc_pipe_dir_object *pdo;
struct gss_alloc_pdo args = {
.clnt = clnt,
.name = name,
.upcall_ops = upcall_ops,
};
pdo = rpc_find_or_alloc_pipe_dir_object(net,
&clnt->cl_pipedir_objects,
gss_pipe_match_pdo,
gss_pipe_alloc_pdo,
&args);
if (pdo != NULL)
return container_of(pdo, struct gss_pipe, pdo);
return ERR_PTR(-ENOMEM);
}
static void __gss_pipe_free(struct gss_pipe *p)
{
struct rpc_clnt *clnt = p->clnt;
@ -871,10 +923,17 @@ static void __gss_pipe_free(struct gss_pipe *p)
kfree(p);
}
static void __gss_pipe_release(struct kref *kref)
{
struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
__gss_pipe_free(p);
}
static void gss_pipe_free(struct gss_pipe *p)
{
if (p != NULL)
__gss_pipe_free(p);
kref_put(&p->kref, __gss_pipe_release);
}
/*
@ -930,14 +989,14 @@ gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
* that we supported only the old pipe. So we instead create
* the new pipe first.
*/
gss_pipe = gss_pipe_alloc(clnt, "gssd", &gss_upcall_ops_v1);
gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
if (IS_ERR(gss_pipe)) {
err = PTR_ERR(gss_pipe);
goto err_destroy_credcache;
}
gss_auth->gss_pipe[1] = gss_pipe;
gss_pipe = gss_pipe_alloc(clnt, gss_auth->mech->gm_name,
gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
&gss_upcall_ops_v0);
if (IS_ERR(gss_pipe)) {
err = PTR_ERR(gss_pipe);
@ -947,7 +1006,7 @@ gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
return auth;
err_destroy_pipe_1:
__gss_pipe_free(gss_auth->gss_pipe[1]);
gss_pipe_free(gss_auth->gss_pipe[1]);
err_destroy_credcache:
rpcauth_destroy_credcache(auth);
err_put_mech: