35e77d21ba
Currently rpc_inline_rcv_pages() uses au_rslack to estimate the size of the upper layer reply header. This is fine for auth flavors where au_verfsize == au_rslack. However, some auth flavors have more going on. krb5i for example has two more words after the verifier, and another blob following the RPC message. The calculation involving au_rslack pushes the upper layer reply header too far into the rcv_buf. au_rslack is still valuable: it's the amount of buffer space needed for the reply, and is used when allocating the reply buffer. We'll keep that. But, add a new field that can be used to properly estimate the location of the upper layer header in each RPC reply, based on the auth flavor in use. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
144 lines
2.7 KiB
C
144 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/net/sunrpc/auth_null.c
|
|
*
|
|
* AUTH_NULL authentication. Really :-)
|
|
*
|
|
* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
# define RPCDBG_FACILITY RPCDBG_AUTH
|
|
#endif
|
|
|
|
static struct rpc_auth null_auth;
|
|
static struct rpc_cred null_cred;
|
|
|
|
static struct rpc_auth *
|
|
nul_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
|
|
{
|
|
refcount_inc(&null_auth.au_count);
|
|
return &null_auth;
|
|
}
|
|
|
|
static void
|
|
nul_destroy(struct rpc_auth *auth)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Lookup NULL creds for current process
|
|
*/
|
|
static struct rpc_cred *
|
|
nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
|
|
{
|
|
return get_rpccred(&null_cred);
|
|
}
|
|
|
|
/*
|
|
* Destroy cred handle.
|
|
*/
|
|
static void
|
|
nul_destroy_cred(struct rpc_cred *cred)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Match cred handle against current process
|
|
*/
|
|
static int
|
|
nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Marshal credential.
|
|
*/
|
|
static int
|
|
nul_marshal(struct rpc_task *task, struct xdr_stream *xdr)
|
|
{
|
|
__be32 *p;
|
|
|
|
p = xdr_reserve_space(xdr, 4 * sizeof(*p));
|
|
if (!p)
|
|
return -EMSGSIZE;
|
|
/* Credential */
|
|
*p++ = rpc_auth_null;
|
|
*p++ = xdr_zero;
|
|
/* Verifier */
|
|
*p++ = rpc_auth_null;
|
|
*p = xdr_zero;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Refresh credential. This is a no-op for AUTH_NULL
|
|
*/
|
|
static int
|
|
nul_refresh(struct rpc_task *task)
|
|
{
|
|
set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nul_validate(struct rpc_task *task, struct xdr_stream *xdr)
|
|
{
|
|
__be32 *p;
|
|
|
|
p = xdr_inline_decode(xdr, 2 * sizeof(*p));
|
|
if (!p)
|
|
return -EIO;
|
|
if (*p++ != rpc_auth_null)
|
|
return -EIO;
|
|
if (*p != xdr_zero)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
const struct rpc_authops authnull_ops = {
|
|
.owner = THIS_MODULE,
|
|
.au_flavor = RPC_AUTH_NULL,
|
|
.au_name = "NULL",
|
|
.create = nul_create,
|
|
.destroy = nul_destroy,
|
|
.lookup_cred = nul_lookup_cred,
|
|
};
|
|
|
|
static
|
|
struct rpc_auth null_auth = {
|
|
.au_cslack = NUL_CALLSLACK,
|
|
.au_rslack = NUL_REPLYSLACK,
|
|
.au_verfsize = NUL_REPLYSLACK,
|
|
.au_ralign = NUL_REPLYSLACK,
|
|
.au_ops = &authnull_ops,
|
|
.au_flavor = RPC_AUTH_NULL,
|
|
.au_count = REFCOUNT_INIT(1),
|
|
};
|
|
|
|
static
|
|
const struct rpc_credops null_credops = {
|
|
.cr_name = "AUTH_NULL",
|
|
.crdestroy = nul_destroy_cred,
|
|
.crmatch = nul_match,
|
|
.crmarshal = nul_marshal,
|
|
.crwrap_req = rpcauth_wrap_req_encode,
|
|
.crrefresh = nul_refresh,
|
|
.crvalidate = nul_validate,
|
|
.crunwrap_resp = rpcauth_unwrap_resp_decode,
|
|
};
|
|
|
|
static
|
|
struct rpc_cred null_cred = {
|
|
.cr_lru = LIST_HEAD_INIT(null_cred.cr_lru),
|
|
.cr_auth = &null_auth,
|
|
.cr_ops = &null_credops,
|
|
.cr_count = REFCOUNT_INIT(2),
|
|
.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
|
|
};
|