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/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/nfs_fs.h>
#include "nfs4_fs.h"
#include "nfs4session.h"
#include "callback.h"
#include "delegation.h"
#include "internal.h"
#include "netns.h"
#include "nfs40.h"
#define NFSDBG_FACILITY NFSDBG_CLIENT
/*
* SETCLIENTID just did a callback update with the callback ident in
* "drop," but server trunking discovery claims "drop" and "keep" are
* actually the same server. Swap the callback IDs so that "keep"
* will continue to use the callback ident the server now knows about,
* and so that "keep"'s original callback ident is destroyed when
* "drop" is freed.
*/
static void nfs4_swap_callback_idents(struct nfs_client *keep,
struct nfs_client *drop)
{
struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
unsigned int save = keep->cl_cb_ident;
if (keep->cl_cb_ident == drop->cl_cb_ident)
return;
dprintk("%s: keeping callback ident %u and dropping ident %u\n",
__func__, keep->cl_cb_ident, drop->cl_cb_ident);
spin_lock(&nn->nfs_client_lock);
idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
keep->cl_cb_ident = drop->cl_cb_ident;
idr_replace(&nn->cb_ident_idr, drop, save);
drop->cl_cb_ident = save;
spin_unlock(&nn->nfs_client_lock);
}
static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
{
return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
}
void nfs40_shutdown_client(struct nfs_client *clp)
{
if (clp->cl_slot_tbl) {
nfs4_shutdown_slot_table(clp->cl_slot_tbl);
kfree(clp->cl_slot_tbl);
}
}
/**
* nfs40_init_client - nfs_client initialization tasks for NFSv4.0
* @clp: nfs_client to initialize
*
* Returns zero on success, or a negative errno if some error occurred.
*/
int nfs40_init_client(struct nfs_client *clp)
{
struct nfs4_slot_table *tbl;
int ret;
tbl = kzalloc_obj(*tbl, GFP_NOFS);
if (tbl == NULL)
return -ENOMEM;
ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
"NFSv4.0 transport Slot table");
if (ret) {
nfs4_shutdown_slot_table(tbl);
kfree(tbl);
return ret;
}
clp->cl_slot_tbl = tbl;
return 0;
}
/*
* nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
* @clp: client to process
*
* Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
* resend of the SETCLIENTID and hence re-establish the
* callback channel. Then return all existing delegations.
*/
void nfs40_handle_cb_pathdown(struct nfs_client *clp)
{
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
nfs_expire_all_delegations(clp);
dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
clp->cl_hostname);
}
void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
{
nfs40_handle_cb_pathdown(clp);
nfs4_schedule_state_manager(clp);
}
/**
* nfs40_walk_client_list - Find server that recognizes a client ID
*
* @new: nfs_client with client ID to test
* @result: OUT: found nfs_client, or new
* @cred: credential to use for trunking test
*
* Returns zero, a negative errno, or a negative NFS4ERR status.
* If zero is returned, an nfs_client pointer is planted in "result."
*
* NB: nfs40_walk_client_list() relies on the new nfs_client being
* the last nfs_client on the list.
*/
static int nfs40_walk_client_list(struct nfs_client *new,
struct nfs_client **result,
const struct cred *cred)
{
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
struct nfs_client *pos, *prev = NULL;
struct nfs4_setclientid_res clid = {
.clientid = new->cl_clientid,
.confirm = new->cl_confirm,
};
int status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
if (pos == new)
goto found;
status = nfs4_match_client(pos, new, &prev, nn);
if (status < 0)
goto out_unlock;
if (status != 0)
continue;
/*
* We just sent a new SETCLIENTID, which should have
* caused the server to return a new cl_confirm. So if
* cl_confirm is the same, then this is a different
* server that just returned the same cl_confirm by
* coincidence:
*/
if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
&new->cl_confirm))
continue;
/*
* But if the cl_confirm's are different, then the only
* way that a SETCLIENTID_CONFIRM to pos can succeed is
* if new and pos point to the same server:
*/
found:
refcount_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
nfs_put_client(prev);
prev = pos;
status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
switch (status) {
case -NFS4ERR_STALE_CLIENTID:
break;
case 0:
nfs4_swap_callback_idents(pos, new);
pos->cl_confirm = new->cl_confirm;
nfs_mark_client_ready(pos, NFS_CS_READY);
prev = NULL;
*result = pos;
goto out;
case -ERESTARTSYS:
case -ETIMEDOUT:
/* The callback path may have been inadvertently
* changed. Schedule recovery!
*/
nfs4_schedule_path_down_recovery(pos);
goto out;
default:
goto out;
}
spin_lock(&nn->nfs_client_lock);
}
out_unlock:
spin_unlock(&nn->nfs_client_lock);
/* No match found. The server lost our clientid */
out:
nfs_put_client(prev);
return status;
}
/**
* nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
*
* @clp: nfs_client under test
* @result: OUT: found nfs_client, or clp
* @cred: credential to use for trunking test
*
* Returns zero, a negative errno, or a negative NFS4ERR status.
* If zero is returned, an nfs_client pointer is planted in
* "result".
*
* Note: The returned client may not yet be marked ready.
*/
int nfs40_discover_server_trunking(struct nfs_client *clp,
struct nfs_client **result,
const struct cred *cred)
{
struct nfs4_setclientid_res clid = {
.clientid = clp->cl_clientid,
.confirm = clp->cl_confirm,
};
struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
unsigned short port;
int status;
port = nn->nfs_callback_tcpport;
if (clp->cl_addr.ss_family == AF_INET6)
port = nn->nfs_callback_tcpport6;
status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
if (status != 0)
goto out;
clp->cl_clientid = clid.clientid;
clp->cl_confirm = clid.confirm;
status = nfs40_walk_client_list(clp, result, cred);
if (status == 0) {
/* Sustain the lease, even if it's empty. If the clientid4
* goes stale it's of no use for trunking discovery. */
nfs4_schedule_state_renewal(*result);
/* If the client state need to recover, do it. */
if (clp->cl_state)
nfs4_schedule_state_manager(clp);
}
out:
return status;
}
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