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![Paulo Alcantara](/assets/img/avatar_default.png)
In smb3_init_transform_rq(), 'orig_len' was only counting the request length, but forgot to count any data pages in the request. Writing or creating files with the 'seal' mount option was broken. In addition, do some code refactoring by exporting smb2_rqst_len() to calculate the appropriate packet size and avoid duplicating the same calculation all over the code. The start of the io vector is either the rfc1002 length (4 bytes) or a SMB2 header which is always > 4. Use this fact to check and skip the rfc1002 length if requested. Signed-off-by: Paulo Alcantara <palcantara@suse.de> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
1184 lines
30 KiB
C
1184 lines
30 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/bvec.h>
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#include <linux/highmem.h>
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#include <linux/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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#include "smb2proto.h"
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#include "smbdirect.h"
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/* Max number of iovectors we can use off the stack when sending requests. */
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#define CIFS_MAX_IOV_SIZE 8
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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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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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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 (time_after(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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* @smb_msg: Message to send
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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 msghdr *smb_msg,
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size_t *sent)
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{
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int rc = 0;
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int retries = 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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while (msg_data_left(smb_msg)) {
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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 = sock_sendmsg(ssocket, smb_msg);
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if (rc == -EAGAIN) {
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retries++;
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if (retries >= 14 ||
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(!server->noblocksnd && (retries > 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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return -EAGAIN;
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}
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msleep(1 << retries);
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continue;
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}
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if (rc < 0)
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return rc;
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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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/* send was at least partially successful */
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*sent += rc;
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retries = 0; /* in case we get ENOSPC on the next send */
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}
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return 0;
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}
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unsigned long
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smb2_rqst_len(struct smb_rqst *rqst, bool skip_rfc1002_marker)
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{
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unsigned int i;
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struct kvec *iov;
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int nvec;
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unsigned long buflen = 0;
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if (skip_rfc1002_marker && rqst->rq_iov[0].iov_len == 4) {
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iov = &rqst->rq_iov[1];
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nvec = rqst->rq_nvec - 1;
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} else {
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iov = rqst->rq_iov;
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nvec = rqst->rq_nvec;
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}
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/* total up iov array first */
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for (i = 0; i < nvec; i++)
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buflen += iov[i].iov_len;
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/*
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* Add in the page array if there is one. The caller needs to make
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* sure rq_offset and rq_tailsz are set correctly. If a buffer of
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* multiple pages ends at page boundary, rq_tailsz needs to be set to
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* PAGE_SIZE.
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*/
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if (rqst->rq_npages) {
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if (rqst->rq_npages == 1)
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buflen += rqst->rq_tailsz;
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else {
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/*
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* If there is more than one page, calculate the
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* buffer length based on rq_offset and rq_tailsz
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*/
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buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) -
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rqst->rq_offset;
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buflen += rqst->rq_tailsz;
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}
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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, int num_rqst,
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struct smb_rqst *rqst)
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{
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int rc = 0;
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struct kvec *iov;
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int n_vec;
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unsigned int send_length = 0;
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unsigned int i, j;
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size_t total_len = 0, sent, size;
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struct socket *ssocket = server->ssocket;
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struct msghdr smb_msg;
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int val = 1;
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__be32 rfc1002_marker;
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if (cifs_rdma_enabled(server) && server->smbd_conn) {
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rc = smbd_send(server->smbd_conn, rqst);
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goto smbd_done;
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}
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if (ssocket == NULL)
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return -ENOTSOCK;
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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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for (j = 0; j < num_rqst; j++)
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send_length += smb2_rqst_len(&rqst[j], true);
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rfc1002_marker = cpu_to_be32(send_length);
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/* Generate a rfc1002 marker for SMB2+ */
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if (server->vals->header_preamble_size == 0) {
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struct kvec hiov = {
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.iov_base = &rfc1002_marker,
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.iov_len = 4
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};
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iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, &hiov,
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1, 4);
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rc = smb_send_kvec(server, &smb_msg, &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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send_length += 4;
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}
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cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length);
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for (j = 0; j < num_rqst; j++) {
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iov = rqst[j].rq_iov;
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n_vec = rqst[j].rq_nvec;
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size = 0;
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for (i = 0; i < n_vec; i++) {
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dump_smb(iov[i].iov_base, iov[i].iov_len);
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size += iov[i].iov_len;
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}
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iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC,
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iov, n_vec, size);
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rc = smb_send_kvec(server, &smb_msg, &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[j].rq_npages; i++) {
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struct bio_vec bvec;
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bvec.bv_page = rqst[j].rq_pages[i];
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rqst_page_get_length(&rqst[j], i, &bvec.bv_len,
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&bvec.bv_offset);
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iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC,
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&bvec, 1, bvec.bv_len);
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rc = smb_send_kvec(server, &smb_msg, &sent);
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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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}
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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 != send_length)) {
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cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n",
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send_length, 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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smbd_done:
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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_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst, int flags)
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{
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struct smb_rqst cur_rqst;
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int rc;
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if (!(flags & CIFS_TRANSFORM_REQ))
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return __smb_send_rqst(server, 1, rqst);
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if (!server->ops->init_transform_rq ||
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!server->ops->free_transform_rq) {
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cifs_dbg(VFS, "Encryption requested but transform callbacks are missed\n");
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return -EIO;
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}
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rc = server->ops->init_transform_rq(server, &cur_rqst, rqst);
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if (rc)
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return rc;
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rc = __smb_send_rqst(server, 1, &cur_rqst);
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server->ops->free_transform_rq(&cur_rqst);
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return rc;
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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[2];
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struct smb_rqst rqst = { .rq_iov = iov,
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.rq_nvec = 2 };
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iov[0].iov_base = smb_buffer;
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iov[0].iov_len = 4;
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iov[1].iov_base = (char *)smb_buffer + 4;
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iov[1].iov_len = smb_buf_length;
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return __smb_send_rqst(server, 1, &rqst);
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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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|
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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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/* 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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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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{
|
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if (ses->server->tcpStatus == CifsExiting) {
|
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return -ENOENT;
|
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}
|
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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 == CifsNew) {
|
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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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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;
|
|
|
|
if (rqst->rq_iov[0].iov_len != 4 ||
|
|
rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
|
|
return ERR_PTR(-EIO);
|
|
|
|
/* 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,
|
|
mid_handle_t *handle, 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->handle = handle;
|
|
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);
|
|
|
|
/*
|
|
* Need to store the time in mid before calling I/O. For call_async,
|
|
* I/O response may come back and free the mid entry on another thread.
|
|
*/
|
|
cifs_save_when_sent(mid);
|
|
cifs_in_send_inc(server);
|
|
rc = smb_send_rqst(server, rqst, flags);
|
|
cifs_in_send_dec(server);
|
|
|
|
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];
|
|
struct kvec rsp_iov;
|
|
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, &rsp_iov);
|
|
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, struct smb_rqst *rqst,
|
|
struct mid_q_entry *mid)
|
|
{
|
|
return server->ops->send_cancel ?
|
|
server->ops->send_cancel(server, rqst, 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[2];
|
|
int rc = 0;
|
|
struct smb_rqst rqst = { .rq_iov = iov,
|
|
.rq_nvec = 2 };
|
|
|
|
iov[0].iov_base = mid->resp_buf;
|
|
iov[0].iov_len = 4;
|
|
iov[1].iov_base = (char *)mid->resp_buf + 4;
|
|
iov[1].iov_len = len - 4;
|
|
/* 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;
|
|
|
|
if (rqst->rq_iov[0].iov_len != 4 ||
|
|
rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
|
|
return ERR_PTR(-EIO);
|
|
|
|
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
|
|
cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
|
|
struct smb_rqst *rqst, int *resp_buf_type, const int flags,
|
|
struct kvec *resp_iov)
|
|
{
|
|
int rc = 0;
|
|
int timeout, optype;
|
|
struct mid_q_entry *midQ;
|
|
unsigned int credits = 1;
|
|
char *buf;
|
|
|
|
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_dbg(VFS, "Null 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.
|
|
*/
|
|
rc = wait_for_free_request(ses->server, timeout, optype);
|
|
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);
|
|
|
|
midQ = ses->server->ops->setup_request(ses, rqst);
|
|
if (IS_ERR(midQ)) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
/* 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_send_rqst(ses->server, rqst, flags);
|
|
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;
|
|
|
|
#ifdef CONFIG_CIFS_SMB311
|
|
if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP))
|
|
smb311_update_preauth_hash(ses, rqst->rq_iov,
|
|
rqst->rq_nvec);
|
|
#endif
|
|
|
|
if (timeout == CIFS_ASYNC_OP)
|
|
goto out;
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc != 0) {
|
|
cifs_dbg(FYI, "Cancelling wait for mid %llu\n", midQ->mid);
|
|
send_cancel(ses->server, rqst, midQ);
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
|
|
midQ->mid_flags |= MID_WAIT_CANCELLED;
|
|
midQ->callback = DeleteMidQEntry;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
add_credits(ses->server, 1, optype);
|
|
return rc;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
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;
|
|
resp_iov->iov_base = buf;
|
|
resp_iov->iov_len = midQ->resp_buf_size +
|
|
ses->server->vals->header_preamble_size;
|
|
if (midQ->large_buf)
|
|
*resp_buf_type = CIFS_LARGE_BUFFER;
|
|
else
|
|
*resp_buf_type = CIFS_SMALL_BUFFER;
|
|
|
|
#ifdef CONFIG_CIFS_SMB311
|
|
if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) {
|
|
struct kvec iov = {
|
|
.iov_base = resp_iov->iov_base,
|
|
.iov_len = resp_iov->iov_len
|
|
};
|
|
smb311_update_preauth_hash(ses, &iov, 1);
|
|
}
|
|
#endif
|
|
|
|
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
|
|
SendReceive2(const unsigned int xid, struct cifs_ses *ses,
|
|
struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
|
|
const int flags, struct kvec *resp_iov)
|
|
{
|
|
struct smb_rqst rqst;
|
|
struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov;
|
|
int rc;
|
|
|
|
if (n_vec + 1 > CIFS_MAX_IOV_SIZE) {
|
|
new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec),
|
|
GFP_KERNEL);
|
|
if (!new_iov) {
|
|
/* otherwise cifs_send_recv below sets resp_buf_type */
|
|
*resp_buf_type = CIFS_NO_BUFFER;
|
|
return -ENOMEM;
|
|
}
|
|
} else
|
|
new_iov = s_iov;
|
|
|
|
/* 1st iov is a RFC1001 length followed by the rest of the packet */
|
|
memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec));
|
|
|
|
new_iov[0].iov_base = new_iov[1].iov_base;
|
|
new_iov[0].iov_len = 4;
|
|
new_iov[1].iov_base += 4;
|
|
new_iov[1].iov_len -= 4;
|
|
|
|
memset(&rqst, 0, sizeof(struct smb_rqst));
|
|
rqst.rq_iov = new_iov;
|
|
rqst.rq_nvec = n_vec + 1;
|
|
|
|
rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov);
|
|
if (n_vec + 1 > CIFS_MAX_IOV_SIZE)
|
|
kfree(new_iov);
|
|
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;
|
|
unsigned int len = be32_to_cpu(in_buf->smb_buf_length);
|
|
struct kvec iov = { .iov_base = in_buf, .iov_len = len };
|
|
struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };
|
|
|
|
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 (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
|
|
cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
|
|
len);
|
|
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, len);
|
|
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, &rqst, 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;
|
|
unsigned int len = be32_to_cpu(in_buf->smb_buf_length);
|
|
struct kvec iov = { .iov_base = in_buf, .iov_len = len };
|
|
struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };
|
|
|
|
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 (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
|
|
cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
|
|
len);
|
|
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, len);
|
|
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, &rqst, 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, &rqst, 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;
|
|
}
|