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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
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/*
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* linux/net/sunrpc/auth_null.c
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*
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* AUTH_NULL authentication. Really :-)
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/sunrpc/clnt.h>
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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static struct rpc_auth null_auth;
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static struct rpc_cred null_cred;
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static struct rpc_auth *
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nul_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
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{
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refcount_inc(&null_auth.au_count);
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return &null_auth;
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}
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static void
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nul_destroy(struct rpc_auth *auth)
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{
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}
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/*
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* Lookup NULL creds for current process
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*/
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static struct rpc_cred *
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nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
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{
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return get_rpccred(&null_cred);
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}
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/*
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* Destroy cred handle.
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*/
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static void
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nul_destroy_cred(struct rpc_cred *cred)
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{
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}
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/*
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* Match cred handle against current process
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*/
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static int
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nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
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{
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return 1;
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}
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/*
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* Marshal credential.
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*/
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static int
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nul_marshal(struct rpc_task *task, struct xdr_stream *xdr)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, 4 * sizeof(*p));
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if (!p)
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return -EMSGSIZE;
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/* Credential */
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*p++ = rpc_auth_null;
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*p++ = xdr_zero;
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/* Verifier */
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*p++ = rpc_auth_null;
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*p = xdr_zero;
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return 0;
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}
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/*
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* Refresh credential. This is a no-op for AUTH_NULL
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*/
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static int
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nul_refresh(struct rpc_task *task)
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{
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set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
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return 0;
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}
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static int
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nul_validate(struct rpc_task *task, struct xdr_stream *xdr)
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{
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__be32 *p;
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p = xdr_inline_decode(xdr, 2 * sizeof(*p));
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if (!p)
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return -EIO;
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if (*p++ != rpc_auth_null)
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return -EIO;
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if (*p != xdr_zero)
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return -EIO;
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return 0;
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}
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const struct rpc_authops authnull_ops = {
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.owner = THIS_MODULE,
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.au_flavor = RPC_AUTH_NULL,
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.au_name = "NULL",
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.create = nul_create,
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.destroy = nul_destroy,
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.lookup_cred = nul_lookup_cred,
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};
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static
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struct rpc_auth null_auth = {
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.au_cslack = NUL_CALLSLACK,
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.au_rslack = NUL_REPLYSLACK,
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.au_verfsize = NUL_REPLYSLACK,
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.au_ralign = NUL_REPLYSLACK,
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.au_ops = &authnull_ops,
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.au_flavor = RPC_AUTH_NULL,
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.au_count = REFCOUNT_INIT(1),
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};
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static
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const struct rpc_credops null_credops = {
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.cr_name = "AUTH_NULL",
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.crdestroy = nul_destroy_cred,
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.crmatch = nul_match,
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.crmarshal = nul_marshal,
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.crwrap_req = rpcauth_wrap_req_encode,
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.crrefresh = nul_refresh,
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.crvalidate = nul_validate,
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.crunwrap_resp = rpcauth_unwrap_resp_decode,
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};
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static
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struct rpc_cred null_cred = {
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.cr_lru = LIST_HEAD_INIT(null_cred.cr_lru),
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.cr_auth = &null_auth,
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.cr_ops = &null_credops,
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.cr_count = REFCOUNT_INIT(2),
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.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
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};
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