root/net/sunrpc/auth_null.c

DEFINITIONS

1. nul_create
2. nul_destroy
3. nul_lookup_cred
4. nul_destroy_cred
5. nul_match
6. nul_marshal
7. nul_refresh
8. nul_validate

/*
 * 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/utsname.h>
#include <linux/sunrpc/clnt.h>

#ifdef RPC_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(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
{
        atomic_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 __be32 *
nul_marshal(struct rpc_task *task, __be32 *p)
{
        *p++ = htonl(RPC_AUTH_NULL);
        *p++ = 0;
        *p++ = htonl(RPC_AUTH_NULL);
        *p++ = 0;

        return p;
}

/*
 * 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_msg.rpc_cred->cr_flags);
        return 0;
}

static __be32 *
nul_validate(struct rpc_task *task, __be32 *p)
{
        rpc_authflavor_t        flavor;
        u32                     size;

        flavor = ntohl(*p++);
        if (flavor != RPC_AUTH_NULL) {
                printk("RPC: bad verf flavor: %u\n", flavor);
                return NULL;
        }

        size = ntohl(*p++);
        if (size != 0) {
                printk("RPC: bad verf size: %u\n", size);
                return NULL;
        }

        return p;
}

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      = 4,
        .au_rslack      = 2,
        .au_ops         = &authnull_ops,
        .au_flavor      = RPC_AUTH_NULL,
        .au_count       = ATOMIC_INIT(0),
};

static
const struct rpc_credops null_credops = {
        .cr_name        = "AUTH_NULL",
        .crdestroy      = nul_destroy_cred,
        .crbind         = rpcauth_generic_bind_cred,
        .crmatch        = nul_match,
        .crmarshal      = nul_marshal,
        .crrefresh      = nul_refresh,
        .crvalidate     = nul_validate,
};

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       = ATOMIC_INIT(1),
        .cr_flags       = 1UL << RPCAUTH_CRED_UPTODATE,
#ifdef RPC_DEBUG
        .cr_magic       = RPCAUTH_CRED_MAGIC,
#endif
};