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820962dc70
cifs_call_async() queues the MID to the pending list and calls smb_send_rqst(). If smb_send_rqst() performs a partial send, it sets the tcpStatus to CifsNeedReconnect and returns an error code to cifs_call_async(). In this case, cifs_call_async() removes the MID from the list and returns to the caller. However, cifs_call_async() releases the server mutex _before_ removing the MID. This means that a cifs_reconnect() can race with this function and manage to remove the MID from the list and delete the entry before cifs_call_async() calls cifs_delete_mid(). This leads to various crashes due to the use after free in cifs_delete_mid(). Task1 Task2 cifs_call_async(): - rc = -EAGAIN - mutex_unlock(srv_mutex) cifs_reconnect(): - mutex_lock(srv_mutex) - mutex_unlock(srv_mutex) - list_delete(mid) - mid->callback() cifs_writev_callback(): - mutex_lock(srv_mutex) - delete(mid) - mutex_unlock(srv_mutex) - cifs_delete_mid(mid) <---- use after free Fix this by removing the MID in cifs_call_async() before releasing the srv_mutex. Also hold the srv_mutex in cifs_reconnect() until the MIDs are moved out of the pending list. Signed-off-by: Rabin Vincent <rabin.vincent@axis.com> Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> CC: Stable <stable@vger.kernel.org> Signed-off-by: Steve French <sfrench@localhost.localdomain>
1118 lines
28 KiB
C
1118 lines
28 KiB
C
/*
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* fs/cifs/transport.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Jeremy Allison (jra@samba.org) 2006.
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/gfp.h>
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#include <linux/wait.h>
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#include <linux/net.h>
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#include <linux/delay.h>
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#include <linux/freezer.h>
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#include <linux/tcp.h>
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#include <linux/highmem.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#include <linux/mempool.h>
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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void
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cifs_wake_up_task(struct mid_q_entry *mid)
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{
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wake_up_process(mid->callback_data);
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}
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struct mid_q_entry *
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AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
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{
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struct mid_q_entry *temp;
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if (server == NULL) {
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cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n");
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return NULL;
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}
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temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
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if (temp == NULL)
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return temp;
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else {
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memset(temp, 0, sizeof(struct mid_q_entry));
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temp->mid = get_mid(smb_buffer);
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temp->pid = current->pid;
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temp->command = cpu_to_le16(smb_buffer->Command);
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cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command);
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/* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
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/* when mid allocated can be before when sent */
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temp->when_alloc = jiffies;
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temp->server = server;
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/*
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* The default is for the mid to be synchronous, so the
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* default callback just wakes up the current task.
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*/
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temp->callback = cifs_wake_up_task;
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temp->callback_data = current;
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}
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atomic_inc(&midCount);
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temp->mid_state = MID_REQUEST_ALLOCATED;
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return temp;
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}
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void
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DeleteMidQEntry(struct mid_q_entry *midEntry)
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{
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#ifdef CONFIG_CIFS_STATS2
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__le16 command = midEntry->server->vals->lock_cmd;
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unsigned long now;
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#endif
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midEntry->mid_state = MID_FREE;
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atomic_dec(&midCount);
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if (midEntry->large_buf)
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cifs_buf_release(midEntry->resp_buf);
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else
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cifs_small_buf_release(midEntry->resp_buf);
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#ifdef CONFIG_CIFS_STATS2
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now = jiffies;
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/* commands taking longer than one second are indications that
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something is wrong, unless it is quite a slow link or server */
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if ((now - midEntry->when_alloc) > HZ) {
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if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) {
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pr_debug(" CIFS slow rsp: cmd %d mid %llu",
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midEntry->command, midEntry->mid);
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pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
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now - midEntry->when_alloc,
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now - midEntry->when_sent,
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now - midEntry->when_received);
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}
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}
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#endif
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mempool_free(midEntry, cifs_mid_poolp);
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}
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void
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cifs_delete_mid(struct mid_q_entry *mid)
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{
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spin_lock(&GlobalMid_Lock);
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list_del(&mid->qhead);
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spin_unlock(&GlobalMid_Lock);
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DeleteMidQEntry(mid);
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}
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/*
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* smb_send_kvec - send an array of kvecs to the server
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* @server: Server to send the data to
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* @iov: Pointer to array of kvecs
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* @n_vec: length of kvec array
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* @sent: amount of data sent on socket is stored here
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*
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* Our basic "send data to server" function. Should be called with srv_mutex
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* held. The caller is responsible for handling the results.
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*/
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static int
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smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec,
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size_t *sent)
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{
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int rc = 0;
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int i = 0;
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struct msghdr smb_msg;
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unsigned int remaining;
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size_t first_vec = 0;
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struct socket *ssocket = server->ssocket;
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*sent = 0;
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smb_msg.msg_name = (struct sockaddr *) &server->dstaddr;
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smb_msg.msg_namelen = sizeof(struct sockaddr);
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smb_msg.msg_control = NULL;
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smb_msg.msg_controllen = 0;
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if (server->noblocksnd)
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smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
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else
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smb_msg.msg_flags = MSG_NOSIGNAL;
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remaining = 0;
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for (i = 0; i < n_vec; i++)
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remaining += iov[i].iov_len;
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i = 0;
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while (remaining) {
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/*
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* If blocking send, we try 3 times, since each can block
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* for 5 seconds. For nonblocking we have to try more
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* but wait increasing amounts of time allowing time for
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* socket to clear. The overall time we wait in either
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* case to send on the socket is about 15 seconds.
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* Similarly we wait for 15 seconds for a response from
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* the server in SendReceive[2] for the server to send
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* a response back for most types of requests (except
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* SMB Write past end of file which can be slow, and
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* blocking lock operations). NFS waits slightly longer
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* than CIFS, but this can make it take longer for
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* nonresponsive servers to be detected and 15 seconds
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* is more than enough time for modern networks to
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* send a packet. In most cases if we fail to send
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* after the retries we will kill the socket and
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* reconnect which may clear the network problem.
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*/
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rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
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n_vec - first_vec, remaining);
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if (rc == -EAGAIN) {
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i++;
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if (i >= 14 || (!server->noblocksnd && (i > 2))) {
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cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n",
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ssocket);
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rc = -EAGAIN;
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break;
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}
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msleep(1 << i);
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continue;
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}
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if (rc < 0)
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break;
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/* send was at least partially successful */
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*sent += rc;
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if (rc == remaining) {
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remaining = 0;
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break;
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}
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if (rc > remaining) {
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cifs_dbg(VFS, "sent %d requested %d\n", rc, remaining);
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break;
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}
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if (rc == 0) {
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/* should never happen, letting socket clear before
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retrying is our only obvious option here */
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cifs_dbg(VFS, "tcp sent no data\n");
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msleep(500);
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continue;
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}
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remaining -= rc;
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/* the line below resets i */
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for (i = first_vec; i < n_vec; i++) {
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if (iov[i].iov_len) {
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if (rc > iov[i].iov_len) {
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rc -= iov[i].iov_len;
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iov[i].iov_len = 0;
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} else {
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iov[i].iov_base += rc;
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iov[i].iov_len -= rc;
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first_vec = i;
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break;
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}
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}
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}
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i = 0; /* in case we get ENOSPC on the next send */
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rc = 0;
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}
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return rc;
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}
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/**
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* rqst_page_to_kvec - Turn a slot in the smb_rqst page array into a kvec
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* @rqst: pointer to smb_rqst
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* @idx: index into the array of the page
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* @iov: pointer to struct kvec that will hold the result
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*
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* Helper function to convert a slot in the rqst->rq_pages array into a kvec.
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* The page will be kmapped and the address placed into iov_base. The length
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* will then be adjusted according to the ptailoff.
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*/
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void
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cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx,
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struct kvec *iov)
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{
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/*
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* FIXME: We could avoid this kmap altogether if we used
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* kernel_sendpage instead of kernel_sendmsg. That will only
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* work if signing is disabled though as sendpage inlines the
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* page directly into the fraglist. If userspace modifies the
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* page after we calculate the signature, then the server will
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* reject it and may break the connection. kernel_sendmsg does
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* an extra copy of the data and avoids that issue.
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*/
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iov->iov_base = kmap(rqst->rq_pages[idx]);
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/* if last page, don't send beyond this offset into page */
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if (idx == (rqst->rq_npages - 1))
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iov->iov_len = rqst->rq_tailsz;
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else
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iov->iov_len = rqst->rq_pagesz;
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}
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static unsigned long
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rqst_len(struct smb_rqst *rqst)
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{
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unsigned int i;
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struct kvec *iov = rqst->rq_iov;
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unsigned long buflen = 0;
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/* total up iov array first */
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for (i = 0; i < rqst->rq_nvec; i++)
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buflen += iov[i].iov_len;
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/* add in the page array if there is one */
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if (rqst->rq_npages) {
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buflen += rqst->rq_pagesz * (rqst->rq_npages - 1);
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buflen += rqst->rq_tailsz;
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}
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return buflen;
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}
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static int
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smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
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{
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int rc;
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struct kvec *iov = rqst->rq_iov;
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int n_vec = rqst->rq_nvec;
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unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base);
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unsigned long send_length;
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unsigned int i;
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size_t total_len = 0, sent;
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struct socket *ssocket = server->ssocket;
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int val = 1;
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if (ssocket == NULL)
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return -ENOTSOCK;
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/* sanity check send length */
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send_length = rqst_len(rqst);
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if (send_length != smb_buf_length + 4) {
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WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n",
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send_length, smb_buf_length);
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return -EIO;
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}
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cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length);
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dump_smb(iov[0].iov_base, iov[0].iov_len);
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/* cork the socket */
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kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,
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(char *)&val, sizeof(val));
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rc = smb_send_kvec(server, iov, n_vec, &sent);
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if (rc < 0)
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goto uncork;
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total_len += sent;
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/* now walk the page array and send each page in it */
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for (i = 0; i < rqst->rq_npages; i++) {
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struct kvec p_iov;
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cifs_rqst_page_to_kvec(rqst, i, &p_iov);
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rc = smb_send_kvec(server, &p_iov, 1, &sent);
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kunmap(rqst->rq_pages[i]);
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if (rc < 0)
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break;
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total_len += sent;
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}
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uncork:
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/* uncork it */
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val = 0;
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kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,
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(char *)&val, sizeof(val));
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if ((total_len > 0) && (total_len != smb_buf_length + 4)) {
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cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n",
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smb_buf_length + 4, total_len);
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/*
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* If we have only sent part of an SMB then the next SMB could
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* be taken as the remainder of this one. We need to kill the
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* socket so the server throws away the partial SMB
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*/
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server->tcpStatus = CifsNeedReconnect;
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}
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if (rc < 0 && rc != -EINTR)
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cifs_dbg(VFS, "Error %d sending data on socket to server\n",
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rc);
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else
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rc = 0;
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return rc;
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}
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static int
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smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec)
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{
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struct smb_rqst rqst = { .rq_iov = iov,
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.rq_nvec = n_vec };
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return smb_send_rqst(server, &rqst);
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}
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int
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smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
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unsigned int smb_buf_length)
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{
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struct kvec iov;
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iov.iov_base = smb_buffer;
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iov.iov_len = smb_buf_length + 4;
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return smb_sendv(server, &iov, 1);
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}
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static int
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wait_for_free_credits(struct TCP_Server_Info *server, const int timeout,
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int *credits)
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{
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int rc;
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spin_lock(&server->req_lock);
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if (timeout == CIFS_ASYNC_OP) {
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/* oplock breaks must not be held up */
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server->in_flight++;
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*credits -= 1;
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spin_unlock(&server->req_lock);
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return 0;
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}
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while (1) {
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if (*credits <= 0) {
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spin_unlock(&server->req_lock);
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cifs_num_waiters_inc(server);
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rc = wait_event_killable(server->request_q,
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has_credits(server, credits));
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cifs_num_waiters_dec(server);
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if (rc)
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return rc;
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spin_lock(&server->req_lock);
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} else {
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if (server->tcpStatus == CifsExiting) {
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spin_unlock(&server->req_lock);
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return -ENOENT;
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}
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|
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/*
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* Can not count locking commands against total
|
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* as they are allowed to block on server.
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*/
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|
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/* update # of requests on the wire to server */
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if (timeout != CIFS_BLOCKING_OP) {
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*credits -= 1;
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server->in_flight++;
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}
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spin_unlock(&server->req_lock);
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break;
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}
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}
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return 0;
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}
|
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|
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static int
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wait_for_free_request(struct TCP_Server_Info *server, const int timeout,
|
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const int optype)
|
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{
|
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int *val;
|
|
|
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val = server->ops->get_credits_field(server, optype);
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/* Since an echo is already inflight, no need to wait to send another */
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if (*val <= 0 && optype == CIFS_ECHO_OP)
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return -EAGAIN;
|
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return wait_for_free_credits(server, timeout, val);
|
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}
|
|
|
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int
|
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cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
|
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unsigned int *num, unsigned int *credits)
|
|
{
|
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*num = size;
|
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*credits = 0;
|
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return 0;
|
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}
|
|
|
|
static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,
|
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struct mid_q_entry **ppmidQ)
|
|
{
|
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if (ses->server->tcpStatus == CifsExiting) {
|
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return -ENOENT;
|
|
}
|
|
|
|
if (ses->server->tcpStatus == CifsNeedReconnect) {
|
|
cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (ses->status == CifsNew) {
|
|
if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
|
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(in_buf->Command != SMB_COM_NEGOTIATE))
|
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return -EAGAIN;
|
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/* else ok - we are setting up session */
|
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}
|
|
|
|
if (ses->status == CifsExiting) {
|
|
/* check if SMB session is bad because we are setting it up */
|
|
if (in_buf->Command != SMB_COM_LOGOFF_ANDX)
|
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return -EAGAIN;
|
|
/* else ok - we are shutting down session */
|
|
}
|
|
|
|
*ppmidQ = AllocMidQEntry(in_buf, ses->server);
|
|
if (*ppmidQ == NULL)
|
|
return -ENOMEM;
|
|
spin_lock(&GlobalMid_Lock);
|
|
list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
|
|
spin_unlock(&GlobalMid_Lock);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
|
|
{
|
|
int error;
|
|
|
|
error = wait_event_freezekillable_unsafe(server->response_q,
|
|
midQ->mid_state != MID_REQUEST_SUBMITTED);
|
|
if (error < 0)
|
|
return -ERESTARTSYS;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct mid_q_entry *
|
|
cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
|
|
{
|
|
int rc;
|
|
struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
|
|
struct mid_q_entry *mid;
|
|
|
|
/* enable signing if server requires it */
|
|
if (server->sign)
|
|
hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
|
|
|
|
mid = AllocMidQEntry(hdr, server);
|
|
if (mid == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
rc = cifs_sign_rqst(rqst, server, &mid->sequence_number);
|
|
if (rc) {
|
|
DeleteMidQEntry(mid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
return mid;
|
|
}
|
|
|
|
/*
|
|
* Send a SMB request and set the callback function in the mid to handle
|
|
* the result. Caller is responsible for dealing with timeouts.
|
|
*/
|
|
int
|
|
cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
|
|
mid_receive_t *receive, mid_callback_t *callback,
|
|
void *cbdata, const int flags)
|
|
{
|
|
int rc, timeout, optype;
|
|
struct mid_q_entry *mid;
|
|
unsigned int credits = 0;
|
|
|
|
timeout = flags & CIFS_TIMEOUT_MASK;
|
|
optype = flags & CIFS_OP_MASK;
|
|
|
|
if ((flags & CIFS_HAS_CREDITS) == 0) {
|
|
rc = wait_for_free_request(server, timeout, optype);
|
|
if (rc)
|
|
return rc;
|
|
credits = 1;
|
|
}
|
|
|
|
mutex_lock(&server->srv_mutex);
|
|
mid = server->ops->setup_async_request(server, rqst);
|
|
if (IS_ERR(mid)) {
|
|
mutex_unlock(&server->srv_mutex);
|
|
add_credits_and_wake_if(server, credits, optype);
|
|
return PTR_ERR(mid);
|
|
}
|
|
|
|
mid->receive = receive;
|
|
mid->callback = callback;
|
|
mid->callback_data = cbdata;
|
|
mid->mid_state = MID_REQUEST_SUBMITTED;
|
|
|
|
/* put it on the pending_mid_q */
|
|
spin_lock(&GlobalMid_Lock);
|
|
list_add_tail(&mid->qhead, &server->pending_mid_q);
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
|
|
cifs_in_send_inc(server);
|
|
rc = smb_send_rqst(server, rqst);
|
|
cifs_in_send_dec(server);
|
|
cifs_save_when_sent(mid);
|
|
|
|
if (rc < 0) {
|
|
server->sequence_number -= 2;
|
|
cifs_delete_mid(mid);
|
|
}
|
|
|
|
mutex_unlock(&server->srv_mutex);
|
|
|
|
if (rc == 0)
|
|
return 0;
|
|
|
|
add_credits_and_wake_if(server, credits, optype);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
*
|
|
* Send an SMB Request. No response info (other than return code)
|
|
* needs to be parsed.
|
|
*
|
|
* flags indicate the type of request buffer and how long to wait
|
|
* and whether to log NT STATUS code (error) before mapping it to POSIX error
|
|
*
|
|
*/
|
|
int
|
|
SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses,
|
|
char *in_buf, int flags)
|
|
{
|
|
int rc;
|
|
struct kvec iov[1];
|
|
int resp_buf_type;
|
|
|
|
iov[0].iov_base = in_buf;
|
|
iov[0].iov_len = get_rfc1002_length(in_buf) + 4;
|
|
flags |= CIFS_NO_RESP;
|
|
rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
|
|
cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
|
|
{
|
|
int rc = 0;
|
|
|
|
cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n",
|
|
__func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state);
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
switch (mid->mid_state) {
|
|
case MID_RESPONSE_RECEIVED:
|
|
spin_unlock(&GlobalMid_Lock);
|
|
return rc;
|
|
case MID_RETRY_NEEDED:
|
|
rc = -EAGAIN;
|
|
break;
|
|
case MID_RESPONSE_MALFORMED:
|
|
rc = -EIO;
|
|
break;
|
|
case MID_SHUTDOWN:
|
|
rc = -EHOSTDOWN;
|
|
break;
|
|
default:
|
|
list_del_init(&mid->qhead);
|
|
cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n",
|
|
__func__, mid->mid, mid->mid_state);
|
|
rc = -EIO;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
mutex_lock(&server->srv_mutex);
|
|
DeleteMidQEntry(mid);
|
|
mutex_unlock(&server->srv_mutex);
|
|
return rc;
|
|
}
|
|
|
|
static inline int
|
|
send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid)
|
|
{
|
|
return server->ops->send_cancel ?
|
|
server->ops->send_cancel(server, buf, mid) : 0;
|
|
}
|
|
|
|
int
|
|
cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
|
|
bool log_error)
|
|
{
|
|
unsigned int len = get_rfc1002_length(mid->resp_buf) + 4;
|
|
|
|
dump_smb(mid->resp_buf, min_t(u32, 92, len));
|
|
|
|
/* convert the length into a more usable form */
|
|
if (server->sign) {
|
|
struct kvec iov;
|
|
int rc = 0;
|
|
struct smb_rqst rqst = { .rq_iov = &iov,
|
|
.rq_nvec = 1 };
|
|
|
|
iov.iov_base = mid->resp_buf;
|
|
iov.iov_len = len;
|
|
/* FIXME: add code to kill session */
|
|
rc = cifs_verify_signature(&rqst, server,
|
|
mid->sequence_number);
|
|
if (rc)
|
|
cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
|
|
rc);
|
|
}
|
|
|
|
/* BB special case reconnect tid and uid here? */
|
|
return map_smb_to_linux_error(mid->resp_buf, log_error);
|
|
}
|
|
|
|
struct mid_q_entry *
|
|
cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
|
|
{
|
|
int rc;
|
|
struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
|
|
struct mid_q_entry *mid;
|
|
|
|
rc = allocate_mid(ses, hdr, &mid);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number);
|
|
if (rc) {
|
|
cifs_delete_mid(mid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
return mid;
|
|
}
|
|
|
|
int
|
|
SendReceive2(const unsigned int xid, struct cifs_ses *ses,
|
|
struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
|
|
const int flags)
|
|
{
|
|
int rc = 0;
|
|
int timeout, optype;
|
|
struct mid_q_entry *midQ;
|
|
char *buf = iov[0].iov_base;
|
|
unsigned int credits = 1;
|
|
struct smb_rqst rqst = { .rq_iov = iov,
|
|
.rq_nvec = n_vec };
|
|
|
|
timeout = flags & CIFS_TIMEOUT_MASK;
|
|
optype = flags & CIFS_OP_MASK;
|
|
|
|
*resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */
|
|
|
|
if ((ses == NULL) || (ses->server == NULL)) {
|
|
cifs_small_buf_release(buf);
|
|
cifs_dbg(VFS, "Null session\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (ses->server->tcpStatus == CifsExiting) {
|
|
cifs_small_buf_release(buf);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* Ensure that we do not send more than 50 overlapping requests
|
|
* to the same server. We may make this configurable later or
|
|
* use ses->maxReq.
|
|
*/
|
|
|
|
rc = wait_for_free_request(ses->server, timeout, optype);
|
|
if (rc) {
|
|
cifs_small_buf_release(buf);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Make sure that we sign in the same order that we send on this socket
|
|
* and avoid races inside tcp sendmsg code that could cause corruption
|
|
* of smb data.
|
|
*/
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
midQ = ses->server->ops->setup_request(ses, &rqst);
|
|
if (IS_ERR(midQ)) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
cifs_small_buf_release(buf);
|
|
/* Update # of requests on wire to server */
|
|
add_credits(ses->server, 1, optype);
|
|
return PTR_ERR(midQ);
|
|
}
|
|
|
|
midQ->mid_state = MID_REQUEST_SUBMITTED;
|
|
cifs_in_send_inc(ses->server);
|
|
rc = smb_sendv(ses->server, iov, n_vec);
|
|
cifs_in_send_dec(ses->server);
|
|
cifs_save_when_sent(midQ);
|
|
|
|
if (rc < 0)
|
|
ses->server->sequence_number -= 2;
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
|
|
if (rc < 0) {
|
|
cifs_small_buf_release(buf);
|
|
goto out;
|
|
}
|
|
|
|
if (timeout == CIFS_ASYNC_OP) {
|
|
cifs_small_buf_release(buf);
|
|
goto out;
|
|
}
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc != 0) {
|
|
send_cancel(ses->server, buf, midQ);
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
|
|
midQ->callback = DeleteMidQEntry;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
cifs_small_buf_release(buf);
|
|
add_credits(ses->server, 1, optype);
|
|
return rc;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
cifs_small_buf_release(buf);
|
|
|
|
rc = cifs_sync_mid_result(midQ, ses->server);
|
|
if (rc != 0) {
|
|
add_credits(ses->server, 1, optype);
|
|
return rc;
|
|
}
|
|
|
|
if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) {
|
|
rc = -EIO;
|
|
cifs_dbg(FYI, "Bad MID state?\n");
|
|
goto out;
|
|
}
|
|
|
|
buf = (char *)midQ->resp_buf;
|
|
iov[0].iov_base = buf;
|
|
iov[0].iov_len = get_rfc1002_length(buf) + 4;
|
|
if (midQ->large_buf)
|
|
*resp_buf_type = CIFS_LARGE_BUFFER;
|
|
else
|
|
*resp_buf_type = CIFS_SMALL_BUFFER;
|
|
|
|
credits = ses->server->ops->get_credits(midQ);
|
|
|
|
rc = ses->server->ops->check_receive(midQ, ses->server,
|
|
flags & CIFS_LOG_ERROR);
|
|
|
|
/* mark it so buf will not be freed by cifs_delete_mid */
|
|
if ((flags & CIFS_NO_RESP) == 0)
|
|
midQ->resp_buf = NULL;
|
|
out:
|
|
cifs_delete_mid(midQ);
|
|
add_credits(ses->server, credits, optype);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
SendReceive(const unsigned int xid, struct cifs_ses *ses,
|
|
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
|
|
int *pbytes_returned, const int timeout)
|
|
{
|
|
int rc = 0;
|
|
struct mid_q_entry *midQ;
|
|
|
|
if (ses == NULL) {
|
|
cifs_dbg(VFS, "Null smb session\n");
|
|
return -EIO;
|
|
}
|
|
if (ses->server == NULL) {
|
|
cifs_dbg(VFS, "Null tcp session\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (ses->server->tcpStatus == CifsExiting)
|
|
return -ENOENT;
|
|
|
|
/* Ensure that we do not send more than 50 overlapping requests
|
|
to the same server. We may make this configurable later or
|
|
use ses->maxReq */
|
|
|
|
if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize +
|
|
MAX_CIFS_HDR_SIZE - 4) {
|
|
cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
|
|
be32_to_cpu(in_buf->smb_buf_length));
|
|
return -EIO;
|
|
}
|
|
|
|
rc = wait_for_free_request(ses->server, timeout, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* make sure that we sign in the same order that we send on this socket
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
|
of smb data */
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
/* Update # of requests on wire to server */
|
|
add_credits(ses->server, 1, 0);
|
|
return rc;
|
|
}
|
|
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
goto out;
|
|
}
|
|
|
|
midQ->mid_state = MID_REQUEST_SUBMITTED;
|
|
|
|
cifs_in_send_inc(ses->server);
|
|
rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
|
|
cifs_in_send_dec(ses->server);
|
|
cifs_save_when_sent(midQ);
|
|
|
|
if (rc < 0)
|
|
ses->server->sequence_number -= 2;
|
|
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
|
|
if (rc < 0)
|
|
goto out;
|
|
|
|
if (timeout == CIFS_ASYNC_OP)
|
|
goto out;
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc != 0) {
|
|
send_cancel(ses->server, in_buf, midQ);
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
|
|
/* no longer considered to be "in-flight" */
|
|
midQ->callback = DeleteMidQEntry;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
add_credits(ses->server, 1, 0);
|
|
return rc;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
rc = cifs_sync_mid_result(midQ, ses->server);
|
|
if (rc != 0) {
|
|
add_credits(ses->server, 1, 0);
|
|
return rc;
|
|
}
|
|
|
|
if (!midQ->resp_buf || !out_buf ||
|
|
midQ->mid_state != MID_RESPONSE_RECEIVED) {
|
|
rc = -EIO;
|
|
cifs_dbg(VFS, "Bad MID state?\n");
|
|
goto out;
|
|
}
|
|
|
|
*pbytes_returned = get_rfc1002_length(midQ->resp_buf);
|
|
memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
|
|
rc = cifs_check_receive(midQ, ses->server, 0);
|
|
out:
|
|
cifs_delete_mid(midQ);
|
|
add_credits(ses->server, 1, 0);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
|
|
blocking lock to return. */
|
|
|
|
static int
|
|
send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct smb_hdr *in_buf,
|
|
struct smb_hdr *out_buf)
|
|
{
|
|
int bytes_returned;
|
|
struct cifs_ses *ses = tcon->ses;
|
|
LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
|
|
|
|
/* We just modify the current in_buf to change
|
|
the type of lock from LOCKING_ANDX_SHARED_LOCK
|
|
or LOCKING_ANDX_EXCLUSIVE_LOCK to
|
|
LOCKING_ANDX_CANCEL_LOCK. */
|
|
|
|
pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
|
|
pSMB->Timeout = 0;
|
|
pSMB->hdr.Mid = get_next_mid(ses->server);
|
|
|
|
return SendReceive(xid, ses, in_buf, out_buf,
|
|
&bytes_returned, 0);
|
|
}
|
|
|
|
int
|
|
SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
|
|
int *pbytes_returned)
|
|
{
|
|
int rc = 0;
|
|
int rstart = 0;
|
|
struct mid_q_entry *midQ;
|
|
struct cifs_ses *ses;
|
|
|
|
if (tcon == NULL || tcon->ses == NULL) {
|
|
cifs_dbg(VFS, "Null smb session\n");
|
|
return -EIO;
|
|
}
|
|
ses = tcon->ses;
|
|
|
|
if (ses->server == NULL) {
|
|
cifs_dbg(VFS, "Null tcp session\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (ses->server->tcpStatus == CifsExiting)
|
|
return -ENOENT;
|
|
|
|
/* Ensure that we do not send more than 50 overlapping requests
|
|
to the same server. We may make this configurable later or
|
|
use ses->maxReq */
|
|
|
|
if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize +
|
|
MAX_CIFS_HDR_SIZE - 4) {
|
|
cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
|
|
be32_to_cpu(in_buf->smb_buf_length));
|
|
return -EIO;
|
|
}
|
|
|
|
rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* make sure that we sign in the same order that we send on this socket
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
|
of smb data */
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
return rc;
|
|
}
|
|
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
|
if (rc) {
|
|
cifs_delete_mid(midQ);
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
return rc;
|
|
}
|
|
|
|
midQ->mid_state = MID_REQUEST_SUBMITTED;
|
|
cifs_in_send_inc(ses->server);
|
|
rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
|
|
cifs_in_send_dec(ses->server);
|
|
cifs_save_when_sent(midQ);
|
|
|
|
if (rc < 0)
|
|
ses->server->sequence_number -= 2;
|
|
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
|
|
if (rc < 0) {
|
|
cifs_delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
|
|
/* Wait for a reply - allow signals to interrupt. */
|
|
rc = wait_event_interruptible(ses->server->response_q,
|
|
(!(midQ->mid_state == MID_REQUEST_SUBMITTED)) ||
|
|
((ses->server->tcpStatus != CifsGood) &&
|
|
(ses->server->tcpStatus != CifsNew)));
|
|
|
|
/* Were we interrupted by a signal ? */
|
|
if ((rc == -ERESTARTSYS) &&
|
|
(midQ->mid_state == MID_REQUEST_SUBMITTED) &&
|
|
((ses->server->tcpStatus == CifsGood) ||
|
|
(ses->server->tcpStatus == CifsNew))) {
|
|
|
|
if (in_buf->Command == SMB_COM_TRANSACTION2) {
|
|
/* POSIX lock. We send a NT_CANCEL SMB to cause the
|
|
blocking lock to return. */
|
|
rc = send_cancel(ses->server, in_buf, midQ);
|
|
if (rc) {
|
|
cifs_delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
} else {
|
|
/* Windows lock. We send a LOCKINGX_CANCEL_LOCK
|
|
to cause the blocking lock to return. */
|
|
|
|
rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
|
|
|
|
/* If we get -ENOLCK back the lock may have
|
|
already been removed. Don't exit in this case. */
|
|
if (rc && rc != -ENOLCK) {
|
|
cifs_delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc) {
|
|
send_cancel(ses->server, in_buf, midQ);
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
|
|
/* no longer considered to be "in-flight" */
|
|
midQ->callback = DeleteMidQEntry;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
return rc;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
/* We got the response - restart system call. */
|
|
rstart = 1;
|
|
}
|
|
|
|
rc = cifs_sync_mid_result(midQ, ses->server);
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
/* rcvd frame is ok */
|
|
if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) {
|
|
rc = -EIO;
|
|
cifs_dbg(VFS, "Bad MID state?\n");
|
|
goto out;
|
|
}
|
|
|
|
*pbytes_returned = get_rfc1002_length(midQ->resp_buf);
|
|
memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
|
|
rc = cifs_check_receive(midQ, ses->server, 0);
|
|
out:
|
|
cifs_delete_mid(midQ);
|
|
if (rstart && rc == -EACCES)
|
|
return -ERESTARTSYS;
|
|
return rc;
|
|
}
|