![Jeff Layton](/assets/img/avatar_default.png)
Currently, the signing routines take a pointer to a place to store the expected sequence number for the mid response. It then stores a value that's one below what that sequence number should be, and then adds one to it when verifying the signature on the response. Increment the sequence number before storing the value in the mid, and eliminate the "+1" when checking the signature. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com> Signed-off-by: Steve French <smfrench@gmail.com>
1062 lines
26 KiB
C
1062 lines
26 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 = smb_buffer->Mid; /* always LE */
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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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printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu",
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midEntry->command, midEntry->mid);
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printk(" 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 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 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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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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* 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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/* 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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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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return wait_for_free_credits(server, timeout,
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server->ops->get_credits_field(server, optype));
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}
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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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{
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if (ses->server->tcpStatus == CifsExiting) {
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return -ENOENT;
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}
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if (ses->server->tcpStatus == CifsNeedReconnect) {
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cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
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return -EAGAIN;
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}
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if (ses->status != CifsGood) {
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/* check if SMB session is bad because we are setting it up */
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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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}
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*ppmidQ = AllocMidQEntry(in_buf, ses->server);
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if (*ppmidQ == NULL)
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return -ENOMEM;
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spin_lock(&GlobalMid_Lock);
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list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
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spin_unlock(&GlobalMid_Lock);
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return 0;
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}
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static int
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wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
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{
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int error;
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error = wait_event_freezekillable(server->response_q,
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midQ->mid_state != MID_REQUEST_SUBMITTED);
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if (error < 0)
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return -ERESTARTSYS;
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return 0;
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}
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|
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struct mid_q_entry *
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cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
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{
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int rc;
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struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
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struct mid_q_entry *mid;
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/* enable signing if server requires it */
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if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
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hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
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mid = AllocMidQEntry(hdr, server);
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if (mid == NULL)
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return ERR_PTR(-ENOMEM);
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rc = cifs_sign_rqst(rqst, server, &mid->sequence_number);
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if (rc) {
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DeleteMidQEntry(mid);
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return ERR_PTR(rc);
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}
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return mid;
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}
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|
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/*
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* Send a SMB request and set the callback function in the mid to handle
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* the result. Caller is responsible for dealing with timeouts.
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*/
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int
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cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
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mid_receive_t *receive, mid_callback_t *callback,
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void *cbdata, const int flags)
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{
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int rc, timeout, optype;
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struct mid_q_entry *mid;
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timeout = flags & CIFS_TIMEOUT_MASK;
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optype = flags & CIFS_OP_MASK;
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rc = wait_for_free_request(server, timeout, optype);
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if (rc)
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return rc;
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|
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mutex_lock(&server->srv_mutex);
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mid = server->ops->setup_async_request(server, rqst);
|
|
if (IS_ERR(mid)) {
|
|
mutex_unlock(&server->srv_mutex);
|
|
add_credits(server, 1, optype);
|
|
wake_up(&server->request_q);
|
|
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;
|
|
mutex_unlock(&server->srv_mutex);
|
|
|
|
if (rc == 0)
|
|
return 0;
|
|
|
|
cifs_delete_mid(mid);
|
|
add_credits(server, 1, optype);
|
|
wake_up(&server->request_q);
|
|
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);
|
|
|
|
DeleteMidQEntry(mid);
|
|
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->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
|
|
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;
|
|
}
|