| /* |
| * fs/cifs/connect.c |
| * |
| * Copyright (C) International Business Machines Corp., 2002,2009 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * |
| * This library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published |
| * by the Free Software Foundation; either version 2.1 of the License, or |
| * (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include <linux/fs.h> |
| #include <linux/net.h> |
| #include <linux/string.h> |
| #include <linux/list.h> |
| #include <linux/wait.h> |
| #include <linux/slab.h> |
| #include <linux/pagemap.h> |
| #include <linux/ctype.h> |
| #include <linux/utsname.h> |
| #include <linux/mempool.h> |
| #include <linux/delay.h> |
| #include <linux/completion.h> |
| #include <linux/kthread.h> |
| #include <linux/pagevec.h> |
| #include <linux/freezer.h> |
| #include <linux/namei.h> |
| #include <asm/uaccess.h> |
| #include <asm/processor.h> |
| #include <linux/inet.h> |
| #include <linux/module.h> |
| #include <keys/user-type.h> |
| #include <net/ipv6.h> |
| #include "cifspdu.h" |
| #include "cifsglob.h" |
| #include "cifsproto.h" |
| #include "cifs_unicode.h" |
| #include "cifs_debug.h" |
| #include "cifs_fs_sb.h" |
| #include "ntlmssp.h" |
| #include "nterr.h" |
| #include "rfc1002pdu.h" |
| #include "fscache.h" |
| |
| #define CIFS_PORT 445 |
| #define RFC1001_PORT 139 |
| |
| /* SMB echo "timeout" -- FIXME: tunable? */ |
| #define SMB_ECHO_INTERVAL (60 * HZ) |
| |
| extern mempool_t *cifs_req_poolp; |
| |
| /* FIXME: should these be tunable? */ |
| #define TLINK_ERROR_EXPIRE (1 * HZ) |
| #define TLINK_IDLE_EXPIRE (600 * HZ) |
| |
| static int ip_connect(struct TCP_Server_Info *server); |
| static int generic_ip_connect(struct TCP_Server_Info *server); |
| static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink); |
| static void cifs_prune_tlinks(struct work_struct *work); |
| static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data, |
| const char *devname); |
| |
| /* |
| * cifs tcp session reconnection |
| * |
| * mark tcp session as reconnecting so temporarily locked |
| * mark all smb sessions as reconnecting for tcp session |
| * reconnect tcp session |
| * wake up waiters on reconnection? - (not needed currently) |
| */ |
| static int |
| cifs_reconnect(struct TCP_Server_Info *server) |
| { |
| int rc = 0; |
| struct list_head *tmp, *tmp2; |
| struct cifs_ses *ses; |
| struct cifs_tcon *tcon; |
| struct mid_q_entry *mid_entry; |
| struct list_head retry_list; |
| |
| spin_lock(&GlobalMid_Lock); |
| if (server->tcpStatus == CifsExiting) { |
| /* the demux thread will exit normally |
| next time through the loop */ |
| spin_unlock(&GlobalMid_Lock); |
| return rc; |
| } else |
| server->tcpStatus = CifsNeedReconnect; |
| spin_unlock(&GlobalMid_Lock); |
| server->maxBuf = 0; |
| |
| cFYI(1, "Reconnecting tcp session"); |
| |
| /* before reconnecting the tcp session, mark the smb session (uid) |
| and the tid bad so they are not used until reconnected */ |
| cFYI(1, "%s: marking sessions and tcons for reconnect", __func__); |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each(tmp, &server->smb_ses_list) { |
| ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
| ses->need_reconnect = true; |
| ses->ipc_tid = 0; |
| list_for_each(tmp2, &ses->tcon_list) { |
| tcon = list_entry(tmp2, struct cifs_tcon, tcon_list); |
| tcon->need_reconnect = true; |
| } |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| /* do not want to be sending data on a socket we are freeing */ |
| cFYI(1, "%s: tearing down socket", __func__); |
| mutex_lock(&server->srv_mutex); |
| if (server->ssocket) { |
| cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state, |
| server->ssocket->flags); |
| kernel_sock_shutdown(server->ssocket, SHUT_WR); |
| cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx", |
| server->ssocket->state, |
| server->ssocket->flags); |
| sock_release(server->ssocket); |
| server->ssocket = NULL; |
| } |
| server->sequence_number = 0; |
| server->session_estab = false; |
| kfree(server->session_key.response); |
| server->session_key.response = NULL; |
| server->session_key.len = 0; |
| server->lstrp = jiffies; |
| mutex_unlock(&server->srv_mutex); |
| |
| /* mark submitted MIDs for retry and issue callback */ |
| INIT_LIST_HEAD(&retry_list); |
| cFYI(1, "%s: moving mids to private list", __func__); |
| spin_lock(&GlobalMid_Lock); |
| list_for_each_safe(tmp, tmp2, &server->pending_mid_q) { |
| mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
| if (mid_entry->midState == MID_REQUEST_SUBMITTED) |
| mid_entry->midState = MID_RETRY_NEEDED; |
| list_move(&mid_entry->qhead, &retry_list); |
| } |
| spin_unlock(&GlobalMid_Lock); |
| |
| cFYI(1, "%s: issuing mid callbacks", __func__); |
| list_for_each_safe(tmp, tmp2, &retry_list) { |
| mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
| list_del_init(&mid_entry->qhead); |
| mid_entry->callback(mid_entry); |
| } |
| |
| do { |
| try_to_freeze(); |
| |
| /* we should try only the port we connected to before */ |
| rc = generic_ip_connect(server); |
| if (rc) { |
| cFYI(1, "reconnect error %d", rc); |
| msleep(3000); |
| } else { |
| atomic_inc(&tcpSesReconnectCount); |
| spin_lock(&GlobalMid_Lock); |
| if (server->tcpStatus != CifsExiting) |
| server->tcpStatus = CifsNeedNegotiate; |
| spin_unlock(&GlobalMid_Lock); |
| } |
| } while (server->tcpStatus == CifsNeedReconnect); |
| |
| return rc; |
| } |
| |
| /* |
| return codes: |
| 0 not a transact2, or all data present |
| >0 transact2 with that much data missing |
| -EINVAL = invalid transact2 |
| |
| */ |
| static int check2ndT2(struct smb_hdr *pSMB) |
| { |
| struct smb_t2_rsp *pSMBt; |
| int remaining; |
| __u16 total_data_size, data_in_this_rsp; |
| |
| if (pSMB->Command != SMB_COM_TRANSACTION2) |
| return 0; |
| |
| /* check for plausible wct, bcc and t2 data and parm sizes */ |
| /* check for parm and data offset going beyond end of smb */ |
| if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */ |
| cFYI(1, "invalid transact2 word count"); |
| return -EINVAL; |
| } |
| |
| pSMBt = (struct smb_t2_rsp *)pSMB; |
| |
| total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount); |
| data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount); |
| |
| if (total_data_size == data_in_this_rsp) |
| return 0; |
| else if (total_data_size < data_in_this_rsp) { |
| cFYI(1, "total data %d smaller than data in frame %d", |
| total_data_size, data_in_this_rsp); |
| return -EINVAL; |
| } |
| |
| remaining = total_data_size - data_in_this_rsp; |
| |
| cFYI(1, "missing %d bytes from transact2, check next response", |
| remaining); |
| if (total_data_size > CIFSMaxBufSize) { |
| cERROR(1, "TotalDataSize %d is over maximum buffer %d", |
| total_data_size, CIFSMaxBufSize); |
| return -EINVAL; |
| } |
| return remaining; |
| } |
| |
| static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB) |
| { |
| struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)psecond; |
| struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB; |
| char *data_area_of_tgt; |
| char *data_area_of_src; |
| int remaining; |
| unsigned int byte_count, total_in_tgt; |
| __u16 tgt_total_cnt, src_total_cnt, total_in_src; |
| |
| src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount); |
| tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount); |
| |
| if (tgt_total_cnt != src_total_cnt) |
| cFYI(1, "total data count of primary and secondary t2 differ " |
| "source=%hu target=%hu", src_total_cnt, tgt_total_cnt); |
| |
| total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount); |
| |
| remaining = tgt_total_cnt - total_in_tgt; |
| |
| if (remaining < 0) { |
| cFYI(1, "Server sent too much data. tgt_total_cnt=%hu " |
| "total_in_tgt=%hu", tgt_total_cnt, total_in_tgt); |
| return -EPROTO; |
| } |
| |
| if (remaining == 0) { |
| /* nothing to do, ignore */ |
| cFYI(1, "no more data remains"); |
| return 0; |
| } |
| |
| total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount); |
| if (remaining < total_in_src) |
| cFYI(1, "transact2 2nd response contains too much data"); |
| |
| /* find end of first SMB data area */ |
| data_area_of_tgt = (char *)&pSMBt->hdr.Protocol + |
| get_unaligned_le16(&pSMBt->t2_rsp.DataOffset); |
| |
| /* validate target area */ |
| data_area_of_src = (char *)&pSMBs->hdr.Protocol + |
| get_unaligned_le16(&pSMBs->t2_rsp.DataOffset); |
| |
| data_area_of_tgt += total_in_tgt; |
| |
| total_in_tgt += total_in_src; |
| /* is the result too big for the field? */ |
| if (total_in_tgt > USHRT_MAX) { |
| cFYI(1, "coalesced DataCount too large (%u)", total_in_tgt); |
| return -EPROTO; |
| } |
| put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount); |
| |
| /* fix up the BCC */ |
| byte_count = get_bcc(pTargetSMB); |
| byte_count += total_in_src; |
| /* is the result too big for the field? */ |
| if (byte_count > USHRT_MAX) { |
| cFYI(1, "coalesced BCC too large (%u)", byte_count); |
| return -EPROTO; |
| } |
| put_bcc(byte_count, pTargetSMB); |
| |
| byte_count = be32_to_cpu(pTargetSMB->smb_buf_length); |
| byte_count += total_in_src; |
| /* don't allow buffer to overflow */ |
| if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
| cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count); |
| return -ENOBUFS; |
| } |
| pTargetSMB->smb_buf_length = cpu_to_be32(byte_count); |
| |
| /* copy second buffer into end of first buffer */ |
| memcpy(data_area_of_tgt, data_area_of_src, total_in_src); |
| |
| if (remaining != total_in_src) { |
| /* more responses to go */ |
| cFYI(1, "waiting for more secondary responses"); |
| return 1; |
| } |
| |
| /* we are done */ |
| cFYI(1, "found the last secondary response"); |
| return 0; |
| } |
| |
| static void |
| cifs_echo_request(struct work_struct *work) |
| { |
| int rc; |
| struct TCP_Server_Info *server = container_of(work, |
| struct TCP_Server_Info, echo.work); |
| |
| /* |
| * We cannot send an echo until the NEGOTIATE_PROTOCOL request is |
| * done, which is indicated by maxBuf != 0. Also, no need to ping if |
| * we got a response recently |
| */ |
| if (server->maxBuf == 0 || |
| time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ)) |
| goto requeue_echo; |
| |
| rc = CIFSSMBEcho(server); |
| if (rc) |
| cFYI(1, "Unable to send echo request to server: %s", |
| server->hostname); |
| |
| requeue_echo: |
| queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL); |
| } |
| |
| static bool |
| allocate_buffers(struct TCP_Server_Info *server) |
| { |
| if (!server->bigbuf) { |
| server->bigbuf = (char *)cifs_buf_get(); |
| if (!server->bigbuf) { |
| cERROR(1, "No memory for large SMB response"); |
| msleep(3000); |
| /* retry will check if exiting */ |
| return false; |
| } |
| } else if (server->large_buf) { |
| /* we are reusing a dirty large buf, clear its start */ |
| memset(server->bigbuf, 0, sizeof(struct smb_hdr)); |
| } |
| |
| if (!server->smallbuf) { |
| server->smallbuf = (char *)cifs_small_buf_get(); |
| if (!server->smallbuf) { |
| cERROR(1, "No memory for SMB response"); |
| msleep(1000); |
| /* retry will check if exiting */ |
| return false; |
| } |
| /* beginning of smb buffer is cleared in our buf_get */ |
| } else { |
| /* if existing small buf clear beginning */ |
| memset(server->smallbuf, 0, sizeof(struct smb_hdr)); |
| } |
| |
| return true; |
| } |
| |
| static bool |
| server_unresponsive(struct TCP_Server_Info *server) |
| { |
| if (echo_retries > 0 && server->tcpStatus == CifsGood && |
| time_after(jiffies, server->lstrp + |
| (echo_retries * SMB_ECHO_INTERVAL))) { |
| cERROR(1, "Server %s has not responded in %d seconds. " |
| "Reconnecting...", server->hostname, |
| (echo_retries * SMB_ECHO_INTERVAL / HZ)); |
| cifs_reconnect(server); |
| wake_up(&server->response_q); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* |
| * kvec_array_init - clone a kvec array, and advance into it |
| * @new: pointer to memory for cloned array |
| * @iov: pointer to original array |
| * @nr_segs: number of members in original array |
| * @bytes: number of bytes to advance into the cloned array |
| * |
| * This function will copy the array provided in iov to a section of memory |
| * and advance the specified number of bytes into the new array. It returns |
| * the number of segments in the new array. "new" must be at least as big as |
| * the original iov array. |
| */ |
| static unsigned int |
| kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs, |
| size_t bytes) |
| { |
| size_t base = 0; |
| |
| while (bytes || !iov->iov_len) { |
| int copy = min(bytes, iov->iov_len); |
| |
| bytes -= copy; |
| base += copy; |
| if (iov->iov_len == base) { |
| iov++; |
| nr_segs--; |
| base = 0; |
| } |
| } |
| memcpy(new, iov, sizeof(*iov) * nr_segs); |
| new->iov_base += base; |
| new->iov_len -= base; |
| return nr_segs; |
| } |
| |
| static struct kvec * |
| get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs) |
| { |
| struct kvec *new_iov; |
| |
| if (server->iov && nr_segs <= server->nr_iov) |
| return server->iov; |
| |
| /* not big enough -- allocate a new one and release the old */ |
| new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS); |
| if (new_iov) { |
| kfree(server->iov); |
| server->iov = new_iov; |
| server->nr_iov = nr_segs; |
| } |
| return new_iov; |
| } |
| |
| int |
| cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig, |
| unsigned int nr_segs, unsigned int to_read) |
| { |
| int length = 0; |
| int total_read; |
| unsigned int segs; |
| struct msghdr smb_msg; |
| struct kvec *iov; |
| |
| iov = get_server_iovec(server, nr_segs); |
| if (!iov) |
| return -ENOMEM; |
| |
| smb_msg.msg_control = NULL; |
| smb_msg.msg_controllen = 0; |
| |
| for (total_read = 0; to_read; total_read += length, to_read -= length) { |
| try_to_freeze(); |
| |
| if (server_unresponsive(server)) { |
| total_read = -EAGAIN; |
| break; |
| } |
| |
| segs = kvec_array_init(iov, iov_orig, nr_segs, total_read); |
| |
| length = kernel_recvmsg(server->ssocket, &smb_msg, |
| iov, segs, to_read, 0); |
| |
| if (server->tcpStatus == CifsExiting) { |
| total_read = -ESHUTDOWN; |
| break; |
| } else if (server->tcpStatus == CifsNeedReconnect) { |
| cifs_reconnect(server); |
| total_read = -EAGAIN; |
| break; |
| } else if (length == -ERESTARTSYS || |
| length == -EAGAIN || |
| length == -EINTR) { |
| /* |
| * Minimum sleep to prevent looping, allowing socket |
| * to clear and app threads to set tcpStatus |
| * CifsNeedReconnect if server hung. |
| */ |
| usleep_range(1000, 2000); |
| length = 0; |
| continue; |
| } else if (length <= 0) { |
| cFYI(1, "Received no data or error: expecting %d " |
| "got %d", to_read, length); |
| cifs_reconnect(server); |
| total_read = -EAGAIN; |
| break; |
| } |
| } |
| return total_read; |
| } |
| |
| int |
| cifs_read_from_socket(struct TCP_Server_Info *server, char *buf, |
| unsigned int to_read) |
| { |
| struct kvec iov; |
| |
| iov.iov_base = buf; |
| iov.iov_len = to_read; |
| |
| return cifs_readv_from_socket(server, &iov, 1, to_read); |
| } |
| |
| static bool |
| is_smb_response(struct TCP_Server_Info *server, unsigned char type) |
| { |
| /* |
| * The first byte big endian of the length field, |
| * is actually not part of the length but the type |
| * with the most common, zero, as regular data. |
| */ |
| switch (type) { |
| case RFC1002_SESSION_MESSAGE: |
| /* Regular SMB response */ |
| return true; |
| case RFC1002_SESSION_KEEP_ALIVE: |
| cFYI(1, "RFC 1002 session keep alive"); |
| break; |
| case RFC1002_POSITIVE_SESSION_RESPONSE: |
| cFYI(1, "RFC 1002 positive session response"); |
| break; |
| case RFC1002_NEGATIVE_SESSION_RESPONSE: |
| /* |
| * We get this from Windows 98 instead of an error on |
| * SMB negprot response. |
| */ |
| cFYI(1, "RFC 1002 negative session response"); |
| /* give server a second to clean up */ |
| msleep(1000); |
| /* |
| * Always try 445 first on reconnect since we get NACK |
| * on some if we ever connected to port 139 (the NACK |
| * is since we do not begin with RFC1001 session |
| * initialize frame). |
| */ |
| cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT); |
| cifs_reconnect(server); |
| wake_up(&server->response_q); |
| break; |
| default: |
| cERROR(1, "RFC 1002 unknown response type 0x%x", type); |
| cifs_reconnect(server); |
| } |
| |
| return false; |
| } |
| |
| static struct mid_q_entry * |
| find_mid(struct TCP_Server_Info *server, struct smb_hdr *buf) |
| { |
| struct mid_q_entry *mid; |
| |
| spin_lock(&GlobalMid_Lock); |
| list_for_each_entry(mid, &server->pending_mid_q, qhead) { |
| if (mid->mid == buf->Mid && |
| mid->midState == MID_REQUEST_SUBMITTED && |
| mid->command == buf->Command) { |
| spin_unlock(&GlobalMid_Lock); |
| return mid; |
| } |
| } |
| spin_unlock(&GlobalMid_Lock); |
| return NULL; |
| } |
| |
| void |
| dequeue_mid(struct mid_q_entry *mid, bool malformed) |
| { |
| #ifdef CONFIG_CIFS_STATS2 |
| mid->when_received = jiffies; |
| #endif |
| spin_lock(&GlobalMid_Lock); |
| if (!malformed) |
| mid->midState = MID_RESPONSE_RECEIVED; |
| else |
| mid->midState = MID_RESPONSE_MALFORMED; |
| list_del_init(&mid->qhead); |
| spin_unlock(&GlobalMid_Lock); |
| } |
| |
| static void |
| handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server, |
| struct smb_hdr *buf, int malformed) |
| { |
| if (malformed == 0 && check2ndT2(buf) > 0) { |
| mid->multiRsp = true; |
| if (mid->resp_buf) { |
| /* merge response - fix up 1st*/ |
| malformed = coalesce_t2(buf, mid->resp_buf); |
| if (malformed > 0) |
| return; |
| |
| /* All parts received or packet is malformed. */ |
| mid->multiEnd = true; |
| return dequeue_mid(mid, malformed); |
| } |
| if (!server->large_buf) { |
| /*FIXME: switch to already allocated largebuf?*/ |
| cERROR(1, "1st trans2 resp needs bigbuf"); |
| } else { |
| /* Have first buffer */ |
| mid->resp_buf = buf; |
| mid->largeBuf = true; |
| server->bigbuf = NULL; |
| } |
| return; |
| } |
| mid->resp_buf = buf; |
| mid->largeBuf = server->large_buf; |
| /* Was previous buf put in mpx struct for multi-rsp? */ |
| if (!mid->multiRsp) { |
| /* smb buffer will be freed by user thread */ |
| if (server->large_buf) |
| server->bigbuf = NULL; |
| else |
| server->smallbuf = NULL; |
| } |
| dequeue_mid(mid, malformed); |
| } |
| |
| static void clean_demultiplex_info(struct TCP_Server_Info *server) |
| { |
| int length; |
| |
| /* take it off the list, if it's not already */ |
| spin_lock(&cifs_tcp_ses_lock); |
| list_del_init(&server->tcp_ses_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| spin_lock(&GlobalMid_Lock); |
| server->tcpStatus = CifsExiting; |
| spin_unlock(&GlobalMid_Lock); |
| wake_up_all(&server->response_q); |
| |
| /* |
| * Check if we have blocked requests that need to free. Note that |
| * cifs_max_pending is normally 50, but can be set at module install |
| * time to as little as two. |
| */ |
| spin_lock(&GlobalMid_Lock); |
| if (atomic_read(&server->inFlight) >= cifs_max_pending) |
| atomic_set(&server->inFlight, cifs_max_pending - 1); |
| /* |
| * We do not want to set the max_pending too low or we could end up |
| * with the counter going negative. |
| */ |
| spin_unlock(&GlobalMid_Lock); |
| /* |
| * Although there should not be any requests blocked on this queue it |
| * can not hurt to be paranoid and try to wake up requests that may |
| * haven been blocked when more than 50 at time were on the wire to the |
| * same server - they now will see the session is in exit state and get |
| * out of SendReceive. |
| */ |
| wake_up_all(&server->request_q); |
| /* give those requests time to exit */ |
| msleep(125); |
| |
| if (server->ssocket) { |
| sock_release(server->ssocket); |
| server->ssocket = NULL; |
| } |
| |
| if (!list_empty(&server->pending_mid_q)) { |
| struct list_head dispose_list; |
| struct mid_q_entry *mid_entry; |
| struct list_head *tmp, *tmp2; |
| |
| INIT_LIST_HEAD(&dispose_list); |
| spin_lock(&GlobalMid_Lock); |
| list_for_each_safe(tmp, tmp2, &server->pending_mid_q) { |
| mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
| cFYI(1, "Clearing mid 0x%x", mid_entry->mid); |
| mid_entry->midState = MID_SHUTDOWN; |
| list_move(&mid_entry->qhead, &dispose_list); |
| } |
| spin_unlock(&GlobalMid_Lock); |
| |
| /* now walk dispose list and issue callbacks */ |
| list_for_each_safe(tmp, tmp2, &dispose_list) { |
| mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
| cFYI(1, "Callback mid 0x%x", mid_entry->mid); |
| list_del_init(&mid_entry->qhead); |
| mid_entry->callback(mid_entry); |
| } |
| /* 1/8th of sec is more than enough time for them to exit */ |
| msleep(125); |
| } |
| |
| if (!list_empty(&server->pending_mid_q)) { |
| /* |
| * mpx threads have not exited yet give them at least the smb |
| * send timeout time for long ops. |
| * |
| * Due to delays on oplock break requests, we need to wait at |
| * least 45 seconds before giving up on a request getting a |
| * response and going ahead and killing cifsd. |
| */ |
| cFYI(1, "Wait for exit from demultiplex thread"); |
| msleep(46000); |
| /* |
| * If threads still have not exited they are probably never |
| * coming home not much else we can do but free the memory. |
| */ |
| } |
| |
| kfree(server->hostname); |
| kfree(server->iov); |
| kfree(server); |
| |
| length = atomic_dec_return(&tcpSesAllocCount); |
| if (length > 0) |
| mempool_resize(cifs_req_poolp, length + cifs_min_rcv, |
| GFP_KERNEL); |
| } |
| |
| static int |
| standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) |
| { |
| int length; |
| char *buf = server->smallbuf; |
| struct smb_hdr *smb_buffer = (struct smb_hdr *)buf; |
| unsigned int pdu_length = be32_to_cpu(smb_buffer->smb_buf_length); |
| |
| /* make sure this will fit in a large buffer */ |
| if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
| cERROR(1, "SMB response too long (%u bytes)", |
| pdu_length); |
| cifs_reconnect(server); |
| wake_up(&server->response_q); |
| return -EAGAIN; |
| } |
| |
| /* switch to large buffer if too big for a small one */ |
| if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) { |
| server->large_buf = true; |
| memcpy(server->bigbuf, server->smallbuf, server->total_read); |
| buf = server->bigbuf; |
| smb_buffer = (struct smb_hdr *)buf; |
| } |
| |
| /* now read the rest */ |
| length = cifs_read_from_socket(server, |
| buf + sizeof(struct smb_hdr) - 1, |
| pdu_length - sizeof(struct smb_hdr) + 1 + 4); |
| if (length < 0) |
| return length; |
| server->total_read += length; |
| |
| dump_smb(smb_buffer, server->total_read); |
| |
| /* |
| * We know that we received enough to get to the MID as we |
| * checked the pdu_length earlier. Now check to see |
| * if the rest of the header is OK. We borrow the length |
| * var for the rest of the loop to avoid a new stack var. |
| * |
| * 48 bytes is enough to display the header and a little bit |
| * into the payload for debugging purposes. |
| */ |
| length = checkSMB(smb_buffer, smb_buffer->Mid, server->total_read); |
| if (length != 0) |
| cifs_dump_mem("Bad SMB: ", buf, |
| min_t(unsigned int, server->total_read, 48)); |
| |
| if (mid) |
| handle_mid(mid, server, smb_buffer, length); |
| |
| return length; |
| } |
| |
| static int |
| cifs_demultiplex_thread(void *p) |
| { |
| int length; |
| struct TCP_Server_Info *server = p; |
| unsigned int pdu_length; |
| char *buf = NULL; |
| struct smb_hdr *smb_buffer = NULL; |
| struct task_struct *task_to_wake = NULL; |
| struct mid_q_entry *mid_entry; |
| |
| current->flags |= PF_MEMALLOC; |
| cFYI(1, "Demultiplex PID: %d", task_pid_nr(current)); |
| |
| length = atomic_inc_return(&tcpSesAllocCount); |
| if (length > 1) |
| mempool_resize(cifs_req_poolp, length + cifs_min_rcv, |
| GFP_KERNEL); |
| |
| set_freezable(); |
| while (server->tcpStatus != CifsExiting) { |
| if (try_to_freeze()) |
| continue; |
| |
| if (!allocate_buffers(server)) |
| continue; |
| |
| server->large_buf = false; |
| smb_buffer = (struct smb_hdr *)server->smallbuf; |
| buf = server->smallbuf; |
| pdu_length = 4; /* enough to get RFC1001 header */ |
| |
| length = cifs_read_from_socket(server, buf, pdu_length); |
| if (length < 0) |
| continue; |
| server->total_read = length; |
| |
| /* |
| * The right amount was read from socket - 4 bytes, |
| * so we can now interpret the length field. |
| */ |
| pdu_length = be32_to_cpu(smb_buffer->smb_buf_length); |
| |
| cFYI(1, "RFC1002 header 0x%x", pdu_length); |
| if (!is_smb_response(server, buf[0])) |
| continue; |
| |
| /* make sure we have enough to get to the MID */ |
| if (pdu_length < sizeof(struct smb_hdr) - 1 - 4) { |
| cERROR(1, "SMB response too short (%u bytes)", |
| pdu_length); |
| cifs_reconnect(server); |
| wake_up(&server->response_q); |
| continue; |
| } |
| |
| /* read down to the MID */ |
| length = cifs_read_from_socket(server, buf + 4, |
| sizeof(struct smb_hdr) - 1 - 4); |
| if (length < 0) |
| continue; |
| server->total_read += length; |
| |
| mid_entry = find_mid(server, smb_buffer); |
| |
| if (!mid_entry || !mid_entry->receive) |
| length = standard_receive3(server, mid_entry); |
| else |
| length = mid_entry->receive(server, mid_entry); |
| |
| if (length < 0) |
| continue; |
| |
| if (server->large_buf) { |
| buf = server->bigbuf; |
| smb_buffer = (struct smb_hdr *)buf; |
| } |
| |
| server->lstrp = jiffies; |
| if (mid_entry != NULL) { |
| if (!mid_entry->multiRsp || mid_entry->multiEnd) |
| mid_entry->callback(mid_entry); |
| } else if (!is_valid_oplock_break(smb_buffer, server)) { |
| cERROR(1, "No task to wake, unknown frame received! " |
| "NumMids %d", atomic_read(&midCount)); |
| cifs_dump_mem("Received Data is: ", buf, |
| sizeof(struct smb_hdr)); |
| #ifdef CONFIG_CIFS_DEBUG2 |
| cifs_dump_detail(smb_buffer); |
| cifs_dump_mids(server); |
| #endif /* CIFS_DEBUG2 */ |
| |
| } |
| } /* end while !EXITING */ |
| |
| /* buffer usually freed in free_mid - need to free it here on exit */ |
| cifs_buf_release(server->bigbuf); |
| if (server->smallbuf) /* no sense logging a debug message if NULL */ |
| cifs_small_buf_release(server->smallbuf); |
| |
| task_to_wake = xchg(&server->tsk, NULL); |
| clean_demultiplex_info(server); |
| |
| /* if server->tsk was NULL then wait for a signal before exiting */ |
| if (!task_to_wake) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| while (!signal_pending(current)) { |
| schedule(); |
| set_current_state(TASK_INTERRUPTIBLE); |
| } |
| set_current_state(TASK_RUNNING); |
| } |
| |
| module_put_and_exit(0); |
| } |
| |
| /* extract the host portion of the UNC string */ |
| static char * |
| extract_hostname(const char *unc) |
| { |
| const char *src; |
| char *dst, *delim; |
| unsigned int len; |
| |
| /* skip double chars at beginning of string */ |
| /* BB: check validity of these bytes? */ |
| src = unc + 2; |
| |
| /* delimiter between hostname and sharename is always '\\' now */ |
| delim = strchr(src, '\\'); |
| if (!delim) |
| return ERR_PTR(-EINVAL); |
| |
| len = delim - src; |
| dst = kmalloc((len + 1), GFP_KERNEL); |
| if (dst == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| memcpy(dst, src, len); |
| dst[len] = '\0'; |
| |
| return dst; |
| } |
| |
| static int |
| cifs_parse_mount_options(const char *mountdata, const char *devname, |
| struct smb_vol *vol) |
| { |
| char *value, *data, *end; |
| char *mountdata_copy = NULL, *options; |
| int err; |
| unsigned int temp_len, i, j; |
| char separator[2]; |
| short int override_uid = -1; |
| short int override_gid = -1; |
| bool uid_specified = false; |
| bool gid_specified = false; |
| char *nodename = utsname()->nodename; |
| |
| separator[0] = ','; |
| separator[1] = 0; |
| |
| /* |
| * does not have to be perfect mapping since field is |
| * informational, only used for servers that do not support |
| * port 445 and it can be overridden at mount time |
| */ |
| memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN); |
| for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++) |
| vol->source_rfc1001_name[i] = toupper(nodename[i]); |
| |
| vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0; |
| /* null target name indicates to use *SMBSERVR default called name |
| if we end up sending RFC1001 session initialize */ |
| vol->target_rfc1001_name[0] = 0; |
| vol->cred_uid = current_uid(); |
| vol->linux_uid = current_uid(); |
| vol->linux_gid = current_gid(); |
| |
| /* default to only allowing write access to owner of the mount */ |
| vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR; |
| |
| /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */ |
| /* default is always to request posix paths. */ |
| vol->posix_paths = 1; |
| /* default to using server inode numbers where available */ |
| vol->server_ino = 1; |
| |
| vol->actimeo = CIFS_DEF_ACTIMEO; |
| |
| if (!mountdata) |
| goto cifs_parse_mount_err; |
| |
| mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL); |
| if (!mountdata_copy) |
| goto cifs_parse_mount_err; |
| |
| options = mountdata_copy; |
| end = options + strlen(options); |
| if (strncmp(options, "sep=", 4) == 0) { |
| if (options[4] != 0) { |
| separator[0] = options[4]; |
| options += 5; |
| } else { |
| cFYI(1, "Null separator not allowed"); |
| } |
| } |
| vol->backupuid_specified = false; /* no backup intent for a user */ |
| vol->backupgid_specified = false; /* no backup intent for a group */ |
| |
| while ((data = strsep(&options, separator)) != NULL) { |
| if (!*data) |
| continue; |
| if ((value = strchr(data, '=')) != NULL) |
| *value++ = '\0'; |
| |
| /* Have to parse this before we parse for "user" */ |
| if (strnicmp(data, "user_xattr", 10) == 0) { |
| vol->no_xattr = 0; |
| } else if (strnicmp(data, "nouser_xattr", 12) == 0) { |
| vol->no_xattr = 1; |
| } else if (strnicmp(data, "user", 4) == 0) { |
| if (!value) { |
| printk(KERN_WARNING |
| "CIFS: invalid or missing username\n"); |
| goto cifs_parse_mount_err; |
| } else if (!*value) { |
| /* null user, ie anonymous, authentication */ |
| vol->nullauth = 1; |
| } |
| if (strnlen(value, MAX_USERNAME_SIZE) < |
| MAX_USERNAME_SIZE) { |
| vol->username = kstrdup(value, GFP_KERNEL); |
| if (!vol->username) { |
| printk(KERN_WARNING "CIFS: no memory " |
| "for username\n"); |
| goto cifs_parse_mount_err; |
| } |
| } else { |
| printk(KERN_WARNING "CIFS: username too long\n"); |
| goto cifs_parse_mount_err; |
| } |
| } else if (strnicmp(data, "pass", 4) == 0) { |
| if (!value) { |
| vol->password = NULL; |
| continue; |
| } else if (value[0] == 0) { |
| /* check if string begins with double comma |
| since that would mean the password really |
| does start with a comma, and would not |
| indicate an empty string */ |
| if (value[1] != separator[0]) { |
| vol->password = NULL; |
| continue; |
| } |
| } |
| temp_len = strlen(value); |
| /* removed password length check, NTLM passwords |
| can be arbitrarily long */ |
| |
| /* if comma in password, the string will be |
| prematurely null terminated. Commas in password are |
| specified across the cifs mount interface by a double |
| comma ie ,, and a comma used as in other cases ie ',' |
| as a parameter delimiter/separator is single and due |
| to the strsep above is temporarily zeroed. */ |
| |
| /* NB: password legally can have multiple commas and |
| the only illegal character in a password is null */ |
| |
| if ((value[temp_len] == 0) && |
| (value + temp_len < end) && |
| (value[temp_len+1] == separator[0])) { |
| /* reinsert comma */ |
| value[temp_len] = separator[0]; |
| temp_len += 2; /* move after second comma */ |
| while (value[temp_len] != 0) { |
| if (value[temp_len] == separator[0]) { |
| if (value[temp_len+1] == |
| separator[0]) { |
| /* skip second comma */ |
| temp_len++; |
| } else { |
| /* single comma indicating start |
| of next parm */ |
| break; |
| } |
| } |
| temp_len++; |
| } |
| if (value[temp_len] == 0) { |
| options = NULL; |
| } else { |
| value[temp_len] = 0; |
| /* point option to start of next parm */ |
| options = value + temp_len + 1; |
| } |
| /* go from value to value + temp_len condensing |
| double commas to singles. Note that this ends up |
| allocating a few bytes too many, which is ok */ |
| vol->password = kzalloc(temp_len, GFP_KERNEL); |
| if (vol->password == NULL) { |
| printk(KERN_WARNING "CIFS: no memory " |
| "for password\n"); |
| goto cifs_parse_mount_err; |
| } |
| for (i = 0, j = 0; i < temp_len; i++, j++) { |
| vol->password[j] = value[i]; |
| if (value[i] == separator[0] |
| && value[i+1] == separator[0]) { |
| /* skip second comma */ |
| i++; |
| } |
| } |
| vol->password[j] = 0; |
| } else { |
| vol->password = kzalloc(temp_len+1, GFP_KERNEL); |
| if (vol->password == NULL) { |
| printk(KERN_WARNING "CIFS: no memory " |
| "for password\n"); |
| goto cifs_parse_mount_err; |
| } |
| strcpy(vol->password, value); |
| } |
| } else if (!strnicmp(data, "ip", 2) || |
| !strnicmp(data, "addr", 4)) { |
| if (!value || !*value) { |
| vol->UNCip = NULL; |
| } else if (strnlen(value, INET6_ADDRSTRLEN) < |
| INET6_ADDRSTRLEN) { |
| vol->UNCip = kstrdup(value, GFP_KERNEL); |
| if (!vol->UNCip) { |
| printk(KERN_WARNING "CIFS: no memory " |
| "for UNC IP\n"); |
| goto cifs_parse_mount_err; |
| } |
| } else { |
| printk(KERN_WARNING "CIFS: ip address " |
| "too long\n"); |
| goto cifs_parse_mount_err; |
| } |
| } else if (strnicmp(data, "sec", 3) == 0) { |
| if (!value || !*value) { |
| cERROR(1, "no security value specified"); |
| continue; |
| } else if (strnicmp(value, "krb5i", 5) == 0) { |
| vol->secFlg |= CIFSSEC_MAY_KRB5 | |
| CIFSSEC_MUST_SIGN; |
| } else if (strnicmp(value, "krb5p", 5) == 0) { |
| /* vol->secFlg |= CIFSSEC_MUST_SEAL | |
| CIFSSEC_MAY_KRB5; */ |
| cERROR(1, "Krb5 cifs privacy not supported"); |
| goto cifs_parse_mount_err; |
| } else if (strnicmp(value, "krb5", 4) == 0) { |
| vol->secFlg |= CIFSSEC_MAY_KRB5; |
| } else if (strnicmp(value, "ntlmsspi", 8) == 0) { |
| vol->secFlg |= CIFSSEC_MAY_NTLMSSP | |
| CIFSSEC_MUST_SIGN; |
| } else if (strnicmp(value, "ntlmssp", 7) == 0) { |
| vol->secFlg |= CIFSSEC_MAY_NTLMSSP; |
| } else if (strnicmp(value, "ntlmv2i", 7) == 0) { |
| vol->secFlg |= CIFSSEC_MAY_NTLMV2 | |
| CIFSSEC_MUST_SIGN; |
| } else if (strnicmp(value, "ntlmv2", 6) == 0) { |
| vol->secFlg |= CIFSSEC_MAY_NTLMV2; |
| } else if (strnicmp(value, "ntlmi", 5) == 0) { |
| vol->secFlg |= CIFSSEC_MAY_NTLM | |
| CIFSSEC_MUST_SIGN; |
| } else if (strnicmp(value, "ntlm", 4) == 0) { |
| /* ntlm is default so can be turned off too */ |
| vol->secFlg |= CIFSSEC_MAY_NTLM; |
| } else if (strnicmp(value, "nontlm", 6) == 0) { |
| /* BB is there a better way to do this? */ |
| vol->secFlg |= CIFSSEC_MAY_NTLMV2; |
| #ifdef CONFIG_CIFS_WEAK_PW_HASH |
| } else if (strnicmp(value, "lanman", 6) == 0) { |
| vol->secFlg |= CIFSSEC_MAY_LANMAN; |
| #endif |
| } else if (strnicmp(value, "none", 4) == 0) { |
| vol->nullauth = 1; |
| } else { |
| cERROR(1, "bad security option: %s", value); |
| goto cifs_parse_mount_err; |
| } |
| } else if (strnicmp(data, "vers", 3) == 0) { |
| if (!value || !*value) { |
| cERROR(1, "no protocol version specified" |
| " after vers= mount option"); |
| } else if ((strnicmp(value, "cifs", 4) == 0) || |
| (strnicmp(value, "1", 1) == 0)) { |
| /* this is the default */ |
| continue; |
| } |
| } else if ((strnicmp(data, "unc", 3) == 0) |
| || (strnicmp(data, "target", 6) == 0) |
| || (strnicmp(data, "path", 4) == 0)) { |
| if (!value || !*value) { |
| printk(KERN_WARNING "CIFS: invalid path to " |
| "network resource\n"); |
| goto cifs_parse_mount_err; |
| } |
| if ((temp_len = strnlen(value, 300)) < 300) { |
| vol->UNC = kmalloc(temp_len+1, GFP_KERNEL); |
| if (vol->UNC == NULL) |
| goto cifs_parse_mount_err; |
| strcpy(vol->UNC, value); |
| if (strncmp(vol->UNC, "//", 2) == 0) { |
| vol->UNC[0] = '\\'; |
| vol->UNC[1] = '\\'; |
| } else if (strncmp(vol->UNC, "\\\\", 2) != 0) { |
| printk(KERN_WARNING |
| "CIFS: UNC Path does not begin " |
| "with // or \\\\ \n"); |
| goto cifs_parse_mount_err; |
| } |
| } else { |
| printk(KERN_WARNING "CIFS: UNC name too long\n"); |
| goto cifs_parse_mount_err; |
| } |
| } else if ((strnicmp(data, "domain", 3) == 0) |
| || (strnicmp(data, "workgroup", 5) == 0)) { |
| if (!value || !*value) { |
| printk(KERN_WARNING "CIFS: invalid domain name\n"); |
| goto cifs_parse_mount_err; |
| } |
| /* BB are there cases in which a comma can be valid in |
| a domain name and need special handling? */ |
| if (strnlen(value, 256) < 256) { |
| vol->domainname = kstrdup(value, GFP_KERNEL); |
| if (!vol->domainname) { |
| printk(KERN_WARNING "CIFS: no memory " |
| "for domainname\n"); |
| goto cifs_parse_mount_err; |
| } |
| cFYI(1, "Domain name set"); |
| } else { |
| printk(KERN_WARNING "CIFS: domain name too " |
| "long\n"); |
| goto cifs_parse_mount_err; |
| } |
| } else if (strnicmp(data, "srcaddr", 7) == 0) { |
| vol->srcaddr.ss_family = AF_UNSPEC; |
| |
| if (!value || !*value) { |
| printk(KERN_WARNING "CIFS: srcaddr value" |
| " not specified.\n"); |
| goto cifs_parse_mount_err; |
| } |
| i = cifs_convert_address((struct sockaddr *)&vol->srcaddr, |
| value, strlen(value)); |
| if (i == 0) { |
| printk(KERN_WARNING "CIFS: Could not parse" |
| " srcaddr: %s\n", |
| value); |
| goto cifs_parse_mount_err; |
| } |
| } else if (strnicmp(data, "prefixpath", 10) == 0) { |
| if (!value || !*value) { |
| printk(KERN_WARNING |
| "CIFS: invalid path prefix\n"); |
| goto cifs_parse_mount_err; |
| } |
| if ((temp_len = strnlen(value, 1024)) < 1024) { |
| if (value[0] != '/') |
| temp_len++; /* missing leading slash */ |
| vol->prepath = kmalloc(temp_len+1, GFP_KERNEL); |
| if (vol->prepath == NULL) |
| goto cifs_parse_mount_err; |
| if (value[0] != '/') { |
| vol->prepath[0] = '/'; |
| strcpy(vol->prepath+1, value); |
| } else |
| strcpy(vol->prepath, value); |
| cFYI(1, "prefix path %s", vol->prepath); |
| } else { |
| printk(KERN_WARNING "CIFS: prefix too long\n"); |
| goto cifs_parse_mount_err; |
| } |
| } else if (strnicmp(data, "iocharset", 9) == 0) { |
| if (!value || !*value) { |
| printk(KERN_WARNING "CIFS: invalid iocharset " |
| "specified\n"); |
| goto cifs_parse_mount_err; |
| } |
| if (strnlen(value, 65) < 65) { |
| if (strnicmp(value, "default", 7)) { |
| vol->iocharset = kstrdup(value, |
| GFP_KERNEL); |
| |
| if (!vol->iocharset) { |
| printk(KERN_WARNING "CIFS: no " |
| "memory for" |
| "charset\n"); |
| goto cifs_parse_mount_err; |
| } |
| } |
| /* if iocharset not set then load_nls_default |
| is used by caller */ |
| cFYI(1, "iocharset set to %s", value); |
| } else { |
| printk(KERN_WARNING "CIFS: iocharset name " |
| "too long.\n"); |
| goto cifs_parse_mount_err; |
| } |
| } else if (!strnicmp(data, "uid", 3) && value && *value) { |
| vol->linux_uid = simple_strtoul(value, &value, 0); |
| uid_specified = true; |
| } else if (!strnicmp(data, "cruid", 5) && value && *value) { |
| vol->cred_uid = simple_strtoul(value, &value, 0); |
| } else if (!strnicmp(data, "forceuid", 8)) { |
| override_uid = 1; |
| } else if (!strnicmp(data, "noforceuid", 10)) { |
| override_uid = 0; |
| } else if (!strnicmp(data, "gid", 3) && value && *value) { |
| vol->linux_gid = simple_strtoul(value, &value, 0); |
| gid_specified = true; |
| } else if (!strnicmp(data, "forcegid", 8)) { |
| override_gid = 1; |
| } else if (!strnicmp(data, "noforcegid", 10)) { |
| override_gid = 0; |
| } else if (strnicmp(data, "file_mode", 4) == 0) { |
| if (value && *value) { |
| vol->file_mode = |
| simple_strtoul(value, &value, 0); |
| } |
| } else if (strnicmp(data, "dir_mode", 4) == 0) { |
| if (value && *value) { |
| vol->dir_mode = |
| simple_strtoul(value, &value, 0); |
| } |
| } else if (strnicmp(data, "dirmode", 4) == 0) { |
| if (value && *value) { |
| vol->dir_mode = |
| simple_strtoul(value, &value, 0); |
| } |
| } else if (strnicmp(data, "port", 4) == 0) { |
| if (value && *value) { |
| vol->port = |
| simple_strtoul(value, &value, 0); |
| } |
| } else if (strnicmp(data, "rsize", 5) == 0) { |
| if (value && *value) { |
| vol->rsize = |
| simple_strtoul(value, &value, 0); |
| } |
| } else if (strnicmp(data, "wsize", 5) == 0) { |
| if (value && *value) { |
| vol->wsize = |
| simple_strtoul(value, &value, 0); |
| } |
| } else if (strnicmp(data, "sockopt", 5) == 0) { |
| if (!value || !*value) { |
| cERROR(1, "no socket option specified"); |
| continue; |
| } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) { |
| vol->sockopt_tcp_nodelay = 1; |
| } |
| } else if (strnicmp(data, "netbiosname", 4) == 0) { |
| if (!value || !*value || (*value == ' ')) { |
| cFYI(1, "invalid (empty) netbiosname"); |
| } else { |
| memset(vol->source_rfc1001_name, 0x20, |
| RFC1001_NAME_LEN); |
| /* |
| * FIXME: are there cases in which a comma can |
| * be valid in workstation netbios name (and |
| * need special handling)? |
| */ |
| for (i = 0; i < RFC1001_NAME_LEN; i++) { |
| /* don't ucase netbiosname for user */ |
| if (value[i] == 0) |
| break; |
| vol->source_rfc1001_name[i] = value[i]; |
| } |
| /* The string has 16th byte zero still from |
| set at top of the function */ |
| if (i == RFC1001_NAME_LEN && value[i] != 0) |
| printk(KERN_WARNING "CIFS: netbiosname" |
| " longer than 15 truncated.\n"); |
| } |
| } else if (strnicmp(data, "servern", 7) == 0) { |
| /* servernetbiosname specified override *SMBSERVER */ |
| if (!value || !*value || (*value == ' ')) { |
| cFYI(1, "empty server netbiosname specified"); |
| } else { |
| /* last byte, type, is 0x20 for servr type */ |
| memset(vol->target_rfc1001_name, 0x20, |
| RFC1001_NAME_LEN_WITH_NULL); |
| |
| for (i = 0; i < 15; i++) { |
| /* BB are there cases in which a comma can be |
| valid in this workstation netbios name |
| (and need special handling)? */ |
| |
| /* user or mount helper must uppercase |
| the netbiosname */ |
| if (value[i] == 0) |
| break; |
| else |
| vol->target_rfc1001_name[i] = |
| value[i]; |
| } |
| /* The string has 16th byte zero still from |
| set at top of the function */ |
| if (i == RFC1001_NAME_LEN && value[i] != 0) |
| printk(KERN_WARNING "CIFS: server net" |
| "biosname longer than 15 truncated.\n"); |
| } |
| } else if (strnicmp(data, "actimeo", 7) == 0) { |
| if (value && *value) { |
| vol->actimeo = HZ * simple_strtoul(value, |
| &value, 0); |
| if (vol->actimeo > CIFS_MAX_ACTIMEO) { |
| cERROR(1, "CIFS: attribute cache" |
| "timeout too large"); |
| goto cifs_parse_mount_err; |
| } |
| } |
| } else if (strnicmp(data, "credentials", 4) == 0) { |
| /* ignore */ |
| } else if (strnicmp(data, "version", 3) == 0) { |
| /* ignore */ |
| } else if (strnicmp(data, "guest", 5) == 0) { |
| /* ignore */ |
| } else if (strnicmp(data, "rw", 2) == 0 && strlen(data) == 2) { |
| /* ignore */ |
| } else if (strnicmp(data, "ro", 2) == 0) { |
| /* ignore */ |
| } else if (strnicmp(data, "noblocksend", 11) == 0) { |
| vol->noblocksnd = 1; |
| } else if (strnicmp(data, "noautotune", 10) == 0) { |
| vol->noautotune = 1; |
| } else if ((strnicmp(data, "suid", 4) == 0) || |
| (strnicmp(data, "nosuid", 6) == 0) || |
| (strnicmp(data, "exec", 4) == 0) || |
| (strnicmp(data, "noexec", 6) == 0) || |
| (strnicmp(data, "nodev", 5) == 0) || |
| (strnicmp(data, "noauto", 6) == 0) || |
| (strnicmp(data, "dev", 3) == 0)) { |
| /* The mount tool or mount.cifs helper (if present) |
| uses these opts to set flags, and the flags are read |
| by the kernel vfs layer before we get here (ie |
| before read super) so there is no point trying to |
| parse these options again and set anything and it |
| is ok to just ignore them */ |
| continue; |
| } else if (strnicmp(data, "hard", 4) == 0) { |
| vol->retry = 1; |
| } else if (strnicmp(data, "soft", 4) == 0) { |
| vol->retry = 0; |
| } else if (strnicmp(data, "perm", 4) == 0) { |
| vol->noperm = 0; |
| } else if (strnicmp(data, "noperm", 6) == 0) { |
| vol->noperm = 1; |
| } else if (strnicmp(data, "mapchars", 8) == 0) { |
| vol->remap = 1; |
| } else if (strnicmp(data, "nomapchars", 10) == 0) { |
| vol->remap = 0; |
| } else if (strnicmp(data, "sfu", 3) == 0) { |
| vol->sfu_emul = 1; |
| } else if (strnicmp(data, "nosfu", 5) == 0) { |
| vol->sfu_emul = 0; |
| } else if (strnicmp(data, "nodfs", 5) == 0) { |
| vol->nodfs = 1; |
| } else if (strnicmp(data, "posixpaths", 10) == 0) { |
| vol->posix_paths = 1; |
| } else if (strnicmp(data, "noposixpaths", 12) == 0) { |
| vol->posix_paths = 0; |
| } else if (strnicmp(data, "nounix", 6) == 0) { |
| vol->no_linux_ext = 1; |
| } else if (strnicmp(data, "nolinux", 7) == 0) { |
| vol->no_linux_ext = 1; |
| } else if ((strnicmp(data, "nocase", 6) == 0) || |
| (strnicmp(data, "ignorecase", 10) == 0)) { |
| vol->nocase = 1; |
| } else if (strnicmp(data, "mand", 4) == 0) { |
| /* ignore */ |
| } else if (strnicmp(data, "nomand", 6) == 0) { |
| /* ignore */ |
| } else if (strnicmp(data, "_netdev", 7) == 0) { |
| /* ignore */ |
| } else if (strnicmp(data, "brl", 3) == 0) { |
| vol->nobrl = 0; |
| } else if ((strnicmp(data, "nobrl", 5) == 0) || |
| (strnicmp(data, "nolock", 6) == 0)) { |
| vol->nobrl = 1; |
| /* turn off mandatory locking in mode |
| if remote locking is turned off since the |
| local vfs will do advisory */ |
| if (vol->file_mode == |
| (S_IALLUGO & ~(S_ISUID | S_IXGRP))) |
| vol->file_mode = S_IALLUGO; |
| } else if (strnicmp(data, "forcemandatorylock", 9) == 0) { |
| /* will take the shorter form "forcemand" as well */ |
| /* This mount option will force use of mandatory |
| (DOS/Windows style) byte range locks, instead of |
| using posix advisory byte range locks, even if the |
| Unix extensions are available and posix locks would |
| be supported otherwise. If Unix extensions are not |
| negotiated this has no effect since mandatory locks |
| would be used (mandatory locks is all that those |
| those servers support) */ |
| vol->mand_lock = 1; |
| } else if (strnicmp(data, "setuids", 7) == 0) { |
| vol->setuids = 1; |
| } else if (strnicmp(data, "nosetuids", 9) == 0) { |
| vol->setuids = 0; |
| } else if (strnicmp(data, "dynperm", 7) == 0) { |
| vol->dynperm = true; |
| } else if (strnicmp(data, "nodynperm", 9) == 0) { |
| vol->dynperm = false; |
| } else if (strnicmp(data, "nohard", 6) == 0) { |
| vol->retry = 0; |
| } else if (strnicmp(data, "nosoft", 6) == 0) { |
| vol->retry = 1; |
| } else if (strnicmp(data, "nointr", 6) == 0) { |
| vol->intr = 0; |
| } else if (strnicmp(data, "intr", 4) == 0) { |
| vol->intr = 1; |
| } else if (strnicmp(data, "nostrictsync", 12) == 0) { |
| vol->nostrictsync = 1; |
| } else if (strnicmp(data, "strictsync", 10) == 0) { |
| vol->nostrictsync = 0; |
| } else if (strnicmp(data, "serverino", 7) == 0) { |
| vol->server_ino = 1; |
| } else if (strnicmp(data, "noserverino", 9) == 0) { |
| vol->server_ino = 0; |
| } else if (strnicmp(data, "rwpidforward", 12) == 0) { |
| vol->rwpidforward = 1; |
| } else if (strnicmp(data, "cifsacl", 7) == 0) { |
| vol->cifs_acl = 1; |
| } else if (strnicmp(data, "nocifsacl", 9) == 0) { |
| vol->cifs_acl = 0; |
| } else if (strnicmp(data, "acl", 3) == 0) { |
| vol->no_psx_acl = 0; |
| } else if (strnicmp(data, "noacl", 5) == 0) { |
| vol->no_psx_acl = 1; |
| } else if (strnicmp(data, "locallease", 6) == 0) { |
| vol->local_lease = 1; |
| } else if (strnicmp(data, "sign", 4) == 0) { |
| vol->secFlg |= CIFSSEC_MUST_SIGN; |
| } else if (strnicmp(data, "seal", 4) == 0) { |
| /* we do not do the following in secFlags because seal |
| is a per tree connection (mount) not a per socket |
| or per-smb connection option in the protocol */ |
| /* vol->secFlg |= CIFSSEC_MUST_SEAL; */ |
| vol->seal = 1; |
| } else if (strnicmp(data, "direct", 6) == 0) { |
| vol->direct_io = 1; |
| } else if (strnicmp(data, "forcedirectio", 13) == 0) { |
| vol->direct_io = 1; |
| } else if (strnicmp(data, "strictcache", 11) == 0) { |
| vol->strict_io = 1; |
| } else if (strnicmp(data, "noac", 4) == 0) { |
| printk(KERN_WARNING "CIFS: Mount option noac not " |
| "supported. Instead set " |
| "/proc/fs/cifs/LookupCacheEnabled to 0\n"); |
| } else if (strnicmp(data, "fsc", 3) == 0) { |
| #ifndef CONFIG_CIFS_FSCACHE |
| cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE " |
| "kernel config option set"); |
| goto cifs_parse_mount_err; |
| #endif |
| vol->fsc = true; |
| } else if (strnicmp(data, "mfsymlinks", 10) == 0) { |
| vol->mfsymlinks = true; |
| } else if (strnicmp(data, "multiuser", 8) == 0) { |
| vol->multiuser = true; |
| } else if (!strnicmp(data, "backupuid", 9) && value && *value) { |
| err = kstrtouint(value, 0, &vol->backupuid); |
| if (err < 0) { |
| cERROR(1, "%s: Invalid backupuid value", |
| __func__); |
| goto cifs_parse_mount_err; |
| } |
| vol->backupuid_specified = true; |
| } else if (!strnicmp(data, "backupgid", 9) && value && *value) { |
| err = kstrtouint(value, 0, &vol->backupgid); |
| if (err < 0) { |
| cERROR(1, "%s: Invalid backupgid value", |
| __func__); |
| goto cifs_parse_mount_err; |
| } |
| vol->backupgid_specified = true; |
| } else |
| printk(KERN_WARNING "CIFS: Unknown mount option %s\n", |
| data); |
| } |
| if (vol->UNC == NULL) { |
| if (devname == NULL) { |
| printk(KERN_WARNING "CIFS: Missing UNC name for mount " |
| "target\n"); |
| goto cifs_parse_mount_err; |
| } |
| if ((temp_len = strnlen(devname, 300)) < 300) { |
| vol->UNC = kmalloc(temp_len+1, GFP_KERNEL); |
| if (vol->UNC == NULL) |
| goto cifs_parse_mount_err; |
| strcpy(vol->UNC, devname); |
| if (strncmp(vol->UNC, "//", 2) == 0) { |
| vol->UNC[0] = '\\'; |
| vol->UNC[1] = '\\'; |
| } else if (strncmp(vol->UNC, "\\\\", 2) != 0) { |
| printk(KERN_WARNING "CIFS: UNC Path does not " |
| "begin with // or \\\\ \n"); |
| goto cifs_parse_mount_err; |
| } |
| value = strpbrk(vol->UNC+2, "/\\"); |
| if (value) |
| *value = '\\'; |
| } else { |
| printk(KERN_WARNING "CIFS: UNC name too long\n"); |
| goto cifs_parse_mount_err; |
| } |
| } |
| |
| #ifndef CONFIG_KEYS |
| /* Muliuser mounts require CONFIG_KEYS support */ |
| if (vol->multiuser) { |
| cERROR(1, "Multiuser mounts require kernels with " |
| "CONFIG_KEYS enabled."); |
| goto cifs_parse_mount_err; |
| } |
| #endif |
| |
| if (vol->UNCip == NULL) |
| vol->UNCip = &vol->UNC[2]; |
| |
| if (uid_specified) |
| vol->override_uid = override_uid; |
| else if (override_uid == 1) |
| printk(KERN_NOTICE "CIFS: ignoring forceuid mount option " |
| "specified with no uid= option.\n"); |
| |
| if (gid_specified) |
| vol->override_gid = override_gid; |
| else if (override_gid == 1) |
| printk(KERN_NOTICE "CIFS: ignoring forcegid mount option " |
| "specified with no gid= option.\n"); |
| |
| kfree(mountdata_copy); |
| return 0; |
| |
| cifs_parse_mount_err: |
| kfree(mountdata_copy); |
| return 1; |
| } |
| |
| /** Returns true if srcaddr isn't specified and rhs isn't |
| * specified, or if srcaddr is specified and |
| * matches the IP address of the rhs argument. |
| */ |
| static bool |
| srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs) |
| { |
| switch (srcaddr->sa_family) { |
| case AF_UNSPEC: |
| return (rhs->sa_family == AF_UNSPEC); |
| case AF_INET: { |
| struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr; |
| struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs; |
| return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr); |
| } |
| case AF_INET6: { |
| struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr; |
| struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs; |
| return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr); |
| } |
| default: |
| WARN_ON(1); |
| return false; /* don't expect to be here */ |
| } |
| } |
| |
| /* |
| * If no port is specified in addr structure, we try to match with 445 port |
| * and if it fails - with 139 ports. It should be called only if address |
| * families of server and addr are equal. |
| */ |
| static bool |
| match_port(struct TCP_Server_Info *server, struct sockaddr *addr) |
| { |
| __be16 port, *sport; |
| |
| switch (addr->sa_family) { |
| case AF_INET: |
| sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port; |
| port = ((struct sockaddr_in *) addr)->sin_port; |
| break; |
| case AF_INET6: |
| sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port; |
| port = ((struct sockaddr_in6 *) addr)->sin6_port; |
| break; |
| default: |
| WARN_ON(1); |
| return false; |
| } |
| |
| if (!port) { |
| port = htons(CIFS_PORT); |
| if (port == *sport) |
| return true; |
| |
| port = htons(RFC1001_PORT); |
| } |
| |
| return port == *sport; |
| } |
| |
| static bool |
| match_address(struct TCP_Server_Info *server, struct sockaddr *addr, |
| struct sockaddr *srcaddr) |
| { |
| switch (addr->sa_family) { |
| case AF_INET: { |
| struct sockaddr_in *addr4 = (struct sockaddr_in *)addr; |
| struct sockaddr_in *srv_addr4 = |
| (struct sockaddr_in *)&server->dstaddr; |
| |
| if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr) |
| return false; |
| break; |
| } |
| case AF_INET6: { |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr; |
| struct sockaddr_in6 *srv_addr6 = |
| (struct sockaddr_in6 *)&server->dstaddr; |
| |
| if (!ipv6_addr_equal(&addr6->sin6_addr, |
| &srv_addr6->sin6_addr)) |
| return false; |
| if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id) |
| return false; |
| break; |
| } |
| default: |
| WARN_ON(1); |
| return false; /* don't expect to be here */ |
| } |
| |
| if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool |
| match_security(struct TCP_Server_Info *server, struct smb_vol *vol) |
| { |
| unsigned int secFlags; |
| |
| if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL))) |
| secFlags = vol->secFlg; |
| else |
| secFlags = global_secflags | vol->secFlg; |
| |
| switch (server->secType) { |
| case LANMAN: |
| if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT))) |
| return false; |
| break; |
| case NTLMv2: |
| if (!(secFlags & CIFSSEC_MAY_NTLMV2)) |
| return false; |
| break; |
| case NTLM: |
| if (!(secFlags & CIFSSEC_MAY_NTLM)) |
| return false; |
| break; |
| case Kerberos: |
| if (!(secFlags & CIFSSEC_MAY_KRB5)) |
| return false; |
| break; |
| case RawNTLMSSP: |
| if (!(secFlags & CIFSSEC_MAY_NTLMSSP)) |
| return false; |
| break; |
| default: |
| /* shouldn't happen */ |
| return false; |
| } |
| |
| /* now check if signing mode is acceptable */ |
| if ((secFlags & CIFSSEC_MAY_SIGN) == 0 && |
| (server->sec_mode & SECMODE_SIGN_REQUIRED)) |
| return false; |
| else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) && |
| (server->sec_mode & |
| (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0) |
| return false; |
| |
| return true; |
| } |
| |
| static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr, |
| struct smb_vol *vol) |
| { |
| if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns)) |
| return 0; |
| |
| if (!match_address(server, addr, |
| (struct sockaddr *)&vol->srcaddr)) |
| return 0; |
| |
| if (!match_port(server, addr)) |
| return 0; |
| |
| if (!match_security(server, vol)) |
| return 0; |
| |
| return 1; |
| } |
| |
| static struct TCP_Server_Info * |
| cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol) |
| { |
| struct TCP_Server_Info *server; |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { |
| if (!match_server(server, addr, vol)) |
| continue; |
| |
| ++server->srv_count; |
| spin_unlock(&cifs_tcp_ses_lock); |
| cFYI(1, "Existing tcp session with server found"); |
| return server; |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| return NULL; |
| } |
| |
| static void |
| cifs_put_tcp_session(struct TCP_Server_Info *server) |
| { |
| struct task_struct *task; |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| if (--server->srv_count > 0) { |
| spin_unlock(&cifs_tcp_ses_lock); |
| return; |
| } |
| |
| put_net(cifs_net_ns(server)); |
| |
| list_del_init(&server->tcp_ses_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| cancel_delayed_work_sync(&server->echo); |
| |
| spin_lock(&GlobalMid_Lock); |
| server->tcpStatus = CifsExiting; |
| spin_unlock(&GlobalMid_Lock); |
| |
| cifs_crypto_shash_release(server); |
| cifs_fscache_release_client_cookie(server); |
| |
| kfree(server->session_key.response); |
| server->session_key.response = NULL; |
| server->session_key.len = 0; |
| |
| task = xchg(&server->tsk, NULL); |
| if (task) |
| force_sig(SIGKILL, task); |
| } |
| |
| static struct TCP_Server_Info * |
| cifs_get_tcp_session(struct smb_vol *volume_info) |
| { |
| struct TCP_Server_Info *tcp_ses = NULL; |
| struct sockaddr_storage addr; |
| struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr; |
| struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr; |
| int rc; |
| |
| memset(&addr, 0, sizeof(struct sockaddr_storage)); |
| |
| cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip); |
| |
| if (volume_info->UNCip && volume_info->UNC) { |
| rc = cifs_fill_sockaddr((struct sockaddr *)&addr, |
| volume_info->UNCip, |
| strlen(volume_info->UNCip), |
| volume_info->port); |
| if (!rc) { |
| /* we failed translating address */ |
| rc = -EINVAL; |
| goto out_err; |
| } |
| } else if (volume_info->UNCip) { |
| /* BB using ip addr as tcp_ses name to connect to the |
| DFS root below */ |
| cERROR(1, "Connecting to DFS root not implemented yet"); |
| rc = -EINVAL; |
| goto out_err; |
| } else /* which tcp_sess DFS root would we conect to */ { |
| cERROR(1, "CIFS mount error: No UNC path (e.g. -o " |
| "unc=//192.168.1.100/public) specified"); |
| rc = -EINVAL; |
| goto out_err; |
| } |
| |
| /* see if we already have a matching tcp_ses */ |
| tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info); |
| if (tcp_ses) |
| return tcp_ses; |
| |
| tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL); |
| if (!tcp_ses) { |
| rc = -ENOMEM; |
| goto out_err; |
| } |
| |
| rc = cifs_crypto_shash_allocate(tcp_ses); |
| if (rc) { |
| cERROR(1, "could not setup hash structures rc %d", rc); |
| goto out_err; |
| } |
| |
| cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns)); |
| tcp_ses->hostname = extract_hostname(volume_info->UNC); |
| if (IS_ERR(tcp_ses->hostname)) { |
| rc = PTR_ERR(tcp_ses->hostname); |
| goto out_err_crypto_release; |
| } |
| |
| tcp_ses->noblocksnd = volume_info->noblocksnd; |
| tcp_ses->noautotune = volume_info->noautotune; |
| tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay; |
| atomic_set(&tcp_ses->inFlight, 0); |
| init_waitqueue_head(&tcp_ses->response_q); |
| init_waitqueue_head(&tcp_ses->request_q); |
| INIT_LIST_HEAD(&tcp_ses->pending_mid_q); |
| mutex_init(&tcp_ses->srv_mutex); |
| memcpy(tcp_ses->workstation_RFC1001_name, |
| volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); |
| memcpy(tcp_ses->server_RFC1001_name, |
| volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); |
| tcp_ses->session_estab = false; |
| tcp_ses->sequence_number = 0; |
| tcp_ses->lstrp = jiffies; |
| INIT_LIST_HEAD(&tcp_ses->tcp_ses_list); |
| INIT_LIST_HEAD(&tcp_ses->smb_ses_list); |
| INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request); |
| |
| /* |
| * at this point we are the only ones with the pointer |
| * to the struct since the kernel thread not created yet |
| * no need to spinlock this init of tcpStatus or srv_count |
| */ |
| tcp_ses->tcpStatus = CifsNew; |
| memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr, |
| sizeof(tcp_ses->srcaddr)); |
| ++tcp_ses->srv_count; |
| |
| if (addr.ss_family == AF_INET6) { |
| cFYI(1, "attempting ipv6 connect"); |
| /* BB should we allow ipv6 on port 139? */ |
| /* other OS never observed in Wild doing 139 with v6 */ |
| memcpy(&tcp_ses->dstaddr, sin_server6, |
| sizeof(struct sockaddr_in6)); |
| } else |
| memcpy(&tcp_ses->dstaddr, sin_server, |
| sizeof(struct sockaddr_in)); |
| |
| rc = ip_connect(tcp_ses); |
| if (rc < 0) { |
| cERROR(1, "Error connecting to socket. Aborting operation"); |
| goto out_err_crypto_release; |
| } |
| |
| /* |
| * since we're in a cifs function already, we know that |
| * this will succeed. No need for try_module_get(). |
| */ |
| __module_get(THIS_MODULE); |
| tcp_ses->tsk = kthread_run(cifs_demultiplex_thread, |
| tcp_ses, "cifsd"); |
| if (IS_ERR(tcp_ses->tsk)) { |
| rc = PTR_ERR(tcp_ses->tsk); |
| cERROR(1, "error %d create cifsd thread", rc); |
| module_put(THIS_MODULE); |
| goto out_err_crypto_release; |
| } |
| tcp_ses->tcpStatus = CifsNeedNegotiate; |
| |
| /* thread spawned, put it on the list */ |
| spin_lock(&cifs_tcp_ses_lock); |
| list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| cifs_fscache_get_client_cookie(tcp_ses); |
| |
| /* queue echo request delayed work */ |
| queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL); |
| |
| return tcp_ses; |
| |
| out_err_crypto_release: |
| cifs_crypto_shash_release(tcp_ses); |
| |
| put_net(cifs_net_ns(tcp_ses)); |
| |
| out_err: |
| if (tcp_ses) { |
| if (!IS_ERR(tcp_ses->hostname)) |
| kfree(tcp_ses->hostname); |
| if (tcp_ses->ssocket) |
| sock_release(tcp_ses->ssocket); |
| kfree(tcp_ses); |
| } |
| return ERR_PTR(rc); |
| } |
| |
| static int match_session(struct cifs_ses *ses, struct smb_vol *vol) |
| { |
| switch (ses->server->secType) { |
| case Kerberos: |
| if (vol->cred_uid != ses->cred_uid) |
| return 0; |
| break; |
| default: |
| /* NULL username means anonymous session */ |
| if (ses->user_name == NULL) { |
| if (!vol->nullauth) |
| return 0; |
| break; |
| } |
| |
| /* anything else takes username/password */ |
| if (strncmp(ses->user_name, |
| vol->username ? vol->username : "", |
| MAX_USERNAME_SIZE)) |
| return 0; |
| if (strlen(vol->username) != 0 && |
| ses->password != NULL && |
| strncmp(ses->password, |
| vol->password ? vol->password : "", |
| MAX_PASSWORD_SIZE)) |
| return 0; |
| } |
| return 1; |
| } |
| |
| static struct cifs_ses * |
| cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol) |
| { |
| struct cifs_ses *ses; |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { |
| if (!match_session(ses, vol)) |
| continue; |
| ++ses->ses_count; |
| spin_unlock(&cifs_tcp_ses_lock); |
| return ses; |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| return NULL; |
| } |
| |
| static void |
| cifs_put_smb_ses(struct cifs_ses *ses) |
| { |
| int xid; |
| struct TCP_Server_Info *server = ses->server; |
| |
| cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count); |
| spin_lock(&cifs_tcp_ses_lock); |
| if (--ses->ses_count > 0) { |
| spin_unlock(&cifs_tcp_ses_lock); |
| return; |
| } |
| |
| list_del_init(&ses->smb_ses_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| if (ses->status == CifsGood) { |
| xid = GetXid(); |
| CIFSSMBLogoff(xid, ses); |
| _FreeXid(xid); |
| } |
| sesInfoFree(ses); |
| cifs_put_tcp_session(server); |
| } |
| |
| #ifdef CONFIG_KEYS |
| |
| /* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */ |
| #define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1) |
| |
| /* Populate username and pw fields from keyring if possible */ |
| static int |
| cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses) |
| { |
| int rc = 0; |
| char *desc, *delim, *payload; |
| ssize_t len; |
| struct key *key; |
| struct TCP_Server_Info *server = ses->server; |
| struct sockaddr_in *sa; |
| struct sockaddr_in6 *sa6; |
| struct user_key_payload *upayload; |
| |
| desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL); |
| if (!desc) |
| return -ENOMEM; |
| |
| /* try to find an address key first */ |
| switch (server->dstaddr.ss_family) { |
| case AF_INET: |
| sa = (struct sockaddr_in *)&server->dstaddr; |
| sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr); |
| break; |
| case AF_INET6: |
| sa6 = (struct sockaddr_in6 *)&server->dstaddr; |
| sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr); |
| break; |
| default: |
| cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family); |
| rc = -EINVAL; |
| goto out_err; |
| } |
| |
| cFYI(1, "%s: desc=%s", __func__, desc); |
| key = request_key(&key_type_logon, desc, ""); |
| if (IS_ERR(key)) { |
| if (!ses->domainName) { |
| cFYI(1, "domainName is NULL"); |
| rc = PTR_ERR(key); |
| goto out_err; |
| } |
| |
| /* didn't work, try to find a domain key */ |
| sprintf(desc, "cifs:d:%s", ses->domainName); |
| cFYI(1, "%s: desc=%s", __func__, desc); |
| key = request_key(&key_type_logon, desc, ""); |
| if (IS_ERR(key)) { |
| rc = PTR_ERR(key); |
| goto out_err; |
| } |
| } |
| |
| down_read(&key->sem); |
| upayload = key->payload.data; |
| if (IS_ERR_OR_NULL(upayload)) { |
| rc = upayload ? PTR_ERR(upayload) : -EINVAL; |
| goto out_key_put; |
| } |
| |
| /* find first : in payload */ |
| payload = (char *)upayload->data; |
| delim = strnchr(payload, upayload->datalen, ':'); |
| cFYI(1, "payload=%s", payload); |
| if (!delim) { |
| cFYI(1, "Unable to find ':' in payload (datalen=%d)", |
| upayload->datalen); |
| rc = -EINVAL; |
| goto out_key_put; |
| } |
| |
| len = delim - payload; |
| if (len > MAX_USERNAME_SIZE || len <= 0) { |
| cFYI(1, "Bad value from username search (len=%zd)", len); |
| rc = -EINVAL; |
| goto out_key_put; |
| } |
| |
| vol->username = kstrndup(payload, len, GFP_KERNEL); |
| if (!vol->username) { |
| cFYI(1, "Unable to allocate %zd bytes for username", len); |
| rc = -ENOMEM; |
| goto out_key_put; |
| } |
| cFYI(1, "%s: username=%s", __func__, vol->username); |
| |
| len = key->datalen - (len + 1); |
| if (len > MAX_PASSWORD_SIZE || len <= 0) { |
| cFYI(1, "Bad len for password search (len=%zd)", len); |
| rc = -EINVAL; |
| kfree(vol->username); |
| vol->username = NULL; |
| goto out_key_put; |
| } |
| |
| ++delim; |
| vol->password = kstrndup(delim, len, GFP_KERNEL); |
| if (!vol->password) { |
| cFYI(1, "Unable to allocate %zd bytes for password", len); |
| rc = -ENOMEM; |
| kfree(vol->username); |
| vol->username = NULL; |
| goto out_key_put; |
| } |
| |
| out_key_put: |
| up_read(&key->sem); |
| key_put(key); |
| out_err: |
| kfree(desc); |
| cFYI(1, "%s: returning %d", __func__, rc); |
| return rc; |
| } |
| #else /* ! CONFIG_KEYS */ |
| static inline int |
| cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)), |
| struct cifs_ses *ses __attribute__((unused))) |
| { |
| return -ENOSYS; |
| } |
| #endif /* CONFIG_KEYS */ |
| |
| static bool warned_on_ntlm; /* globals init to false automatically */ |
| |
| static struct cifs_ses * |
| cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info) |
| { |
| int rc = -ENOMEM, xid; |
| struct cifs_ses *ses; |
| struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr; |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr; |
| |
| xid = GetXid(); |
| |
| ses = cifs_find_smb_ses(server, volume_info); |
| if (ses) { |
| cFYI(1, "Existing smb sess found (status=%d)", ses->status); |
| |
| mutex_lock(&ses->session_mutex); |
| rc = cifs_negotiate_protocol(xid, ses); |
| if (rc) { |
| mutex_unlock(&ses->session_mutex); |
| /* problem -- put our ses reference */ |
| cifs_put_smb_ses(ses); |
| FreeXid(xid); |
| return ERR_PTR(rc); |
| } |
| if (ses->need_reconnect) { |
| cFYI(1, "Session needs reconnect"); |
| rc = cifs_setup_session(xid, ses, |
| volume_info->local_nls); |
| if (rc) { |
| mutex_unlock(&ses->session_mutex); |
| /* problem -- put our reference */ |
| cifs_put_smb_ses(ses); |
| FreeXid(xid); |
| return ERR_PTR(rc); |
| } |
| } |
| mutex_unlock(&ses->session_mutex); |
| |
| /* existing SMB ses has a server reference already */ |
| cifs_put_tcp_session(server); |
| FreeXid(xid); |
| return ses; |
| } |
| |
| cFYI(1, "Existing smb sess not found"); |
| ses = sesInfoAlloc(); |
| if (ses == NULL) |
| goto get_ses_fail; |
| |
| /* new SMB session uses our server ref */ |
| ses->server = server; |
| if (server->dstaddr.ss_family == AF_INET6) |
| sprintf(ses->serverName, "%pI6", &addr6->sin6_addr); |
| else |
| sprintf(ses->serverName, "%pI4", &addr->sin_addr); |
| |
| if (volume_info->username) { |
| ses->user_name = kstrdup(volume_info->username, GFP_KERNEL); |
| if (!ses->user_name) |
| goto get_ses_fail; |
| } |
| |
| /* volume_info->password freed at unmount */ |
| if (volume_info->password) { |
| ses->password = kstrdup(volume_info->password, GFP_KERNEL); |
| if (!ses->password) |
| goto get_ses_fail; |
| } |
| if (volume_info->domainname) { |
| ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL); |
| if (!ses->domainName) |
| goto get_ses_fail; |
| } |
| ses->cred_uid = volume_info->cred_uid; |
| ses->linux_uid = volume_info->linux_uid; |
| |
| /* ntlmv2 is much stronger than ntlm security, and has been broadly |
| supported for many years, time to update default security mechanism */ |
| if ((volume_info->secFlg == 0) && warned_on_ntlm == false) { |
| warned_on_ntlm = true; |
| cERROR(1, "default security mechanism requested. The default " |
| "security mechanism will be upgraded from ntlm to " |
| "ntlmv2 in kernel release 3.3"); |
| } |
| ses->overrideSecFlg = volume_info->secFlg; |
| |
| mutex_lock(&ses->session_mutex); |
| rc = cifs_negotiate_protocol(xid, ses); |
| if (!rc) |
| rc = cifs_setup_session(xid, ses, volume_info->local_nls); |
| mutex_unlock(&ses->session_mutex); |
| if (rc) |
| goto get_ses_fail; |
| |
| /* success, put it on the list */ |
| spin_lock(&cifs_tcp_ses_lock); |
| list_add(&ses->smb_ses_list, &server->smb_ses_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| FreeXid(xid); |
| return ses; |
| |
| get_ses_fail: |
| sesInfoFree(ses); |
| FreeXid(xid); |
| return ERR_PTR(rc); |
| } |
| |
| static int match_tcon(struct cifs_tcon *tcon, const char *unc) |
| { |
| if (tcon->tidStatus == CifsExiting) |
| return 0; |
| if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE)) |
| return 0; |
| return 1; |
| } |
| |
| static struct cifs_tcon * |
| cifs_find_tcon(struct cifs_ses *ses, const char *unc) |
| { |
| struct list_head *tmp; |
| struct cifs_tcon *tcon; |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each(tmp, &ses->tcon_list) { |
| tcon = list_entry(tmp, struct cifs_tcon, tcon_list); |
| if (!match_tcon(tcon, unc)) |
| continue; |
| ++tcon->tc_count; |
| spin_unlock(&cifs_tcp_ses_lock); |
| return tcon; |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| return NULL; |
| } |
| |
| static void |
| cifs_put_tcon(struct cifs_tcon *tcon) |
| { |
| int xid; |
| struct cifs_ses *ses = tcon->ses; |
| |
| cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count); |
| spin_lock(&cifs_tcp_ses_lock); |
| if (--tcon->tc_count > 0) { |
| spin_unlock(&cifs_tcp_ses_lock); |
| return; |
| } |
| |
| list_del_init(&tcon->tcon_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| xid = GetXid(); |
| CIFSSMBTDis(xid, tcon); |
| _FreeXid(xid); |
| |
| cifs_fscache_release_super_cookie(tcon); |
| tconInfoFree(tcon); |
| cifs_put_smb_ses(ses); |
| } |
| |
| static struct cifs_tcon * |
| cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info) |
| { |
| int rc, xid; |
| struct cifs_tcon *tcon; |
| |
| tcon = cifs_find_tcon(ses, volume_info->UNC); |
| if (tcon) { |
| cFYI(1, "Found match on UNC path"); |
| /* existing tcon already has a reference */ |
| cifs_put_smb_ses(ses); |
| if (tcon->seal != volume_info->seal) |
| cERROR(1, "transport encryption setting " |
| "conflicts with existing tid"); |
| return tcon; |
| } |
| |
| tcon = tconInfoAlloc(); |
| if (tcon == NULL) { |
| rc = -ENOMEM; |
| goto out_fail; |
| } |
| |
| tcon->ses = ses; |
| if (volume_info->password) { |
| tcon->password = kstrdup(volume_info->password, GFP_KERNEL); |
| if (!tcon->password) { |
| rc = -ENOMEM; |
| goto out_fail; |
| } |
| } |
| |
| if (strchr(volume_info->UNC + 3, '\\') == NULL |
| && strchr(volume_info->UNC + 3, '/') == NULL) { |
| cERROR(1, "Missing share name"); |
| rc = -ENODEV; |
| goto out_fail; |
| } |
| |
| /* BB Do we need to wrap session_mutex around |
| * this TCon call and Unix SetFS as |
| * we do on SessSetup and reconnect? */ |
| xid = GetXid(); |
| rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls); |
| FreeXid(xid); |
| cFYI(1, "CIFS Tcon rc = %d", rc); |
| if (rc) |
| goto out_fail; |
| |
| if (volume_info->nodfs) { |
| tcon->Flags &= ~SMB_SHARE_IS_IN_DFS; |
| cFYI(1, "DFS disabled (%d)", tcon->Flags); |
| } |
| tcon->seal = volume_info->seal; |
| /* we can have only one retry value for a connection |
| to a share so for resources mounted more than once |
| to the same server share the last value passed in |
| for the retry flag is used */ |
| tcon->retry = volume_info->retry; |
| tcon->nocase = volume_info->nocase; |
| tcon->local_lease = volume_info->local_lease; |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| list_add(&tcon->tcon_list, &ses->tcon_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| cifs_fscache_get_super_cookie(tcon); |
| |
| return tcon; |
| |
| out_fail: |
| tconInfoFree(tcon); |
| return ERR_PTR(rc); |
| } |
| |
| void |
| cifs_put_tlink(struct tcon_link *tlink) |
| { |
| if (!tlink || IS_ERR(tlink)) |
| return; |
| |
| if (!atomic_dec_and_test(&tlink->tl_count) || |
| test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) { |
| tlink->tl_time = jiffies; |
| return; |
| } |
| |
| if (!IS_ERR(tlink_tcon(tlink))) |
| cifs_put_tcon(tlink_tcon(tlink)); |
| kfree(tlink); |
| return; |
| } |
| |
| static inline struct tcon_link * |
| cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) |
| { |
| return cifs_sb->master_tlink; |
| } |
| |
| static int |
| compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data) |
| { |
| struct cifs_sb_info *old = CIFS_SB(sb); |
| struct cifs_sb_info *new = mnt_data->cifs_sb; |
| |
| if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK)) |
| return 0; |
| |
| if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) != |
| (new->mnt_cifs_flags & CIFS_MOUNT_MASK)) |
| return 0; |
| |
| /* |
| * We want to share sb only if we don't specify an r/wsize or |
| * specified r/wsize is greater than or equal to existing one. |
| */ |
| if (new->wsize && new->wsize < old->wsize) |
| return 0; |
| |
| if (new->rsize && new->rsize < old->rsize) |
| return 0; |
| |
| if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid) |
| return 0; |
| |
| if (old->mnt_file_mode != new->mnt_file_mode || |
| old->mnt_dir_mode != new->mnt_dir_mode) |
| return 0; |
| |
| if (strcmp(old->local_nls->charset, new->local_nls->charset)) |
| return 0; |
| |
| if (old->actimeo != new->actimeo) |
| return 0; |
| |
| return 1; |
| } |
| |
| int |
| cifs_match_super(struct super_block *sb, void *data) |
| { |
| struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data; |
| struct smb_vol *volume_info; |
| struct cifs_sb_info *cifs_sb; |
| struct TCP_Server_Info *tcp_srv; |
| struct cifs_ses *ses; |
| struct cifs_tcon *tcon; |
| struct tcon_link *tlink; |
| struct sockaddr_storage addr; |
| int rc = 0; |
| |
| memset(&addr, 0, sizeof(struct sockaddr_storage)); |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| cifs_sb = CIFS_SB(sb); |
| tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); |
| if (IS_ERR(tlink)) { |
| spin_unlock(&cifs_tcp_ses_lock); |
| return rc; |
| } |
| tcon = tlink_tcon(tlink); |
| ses = tcon->ses; |
| tcp_srv = ses->server; |
| |
| volume_info = mnt_data->vol; |
| |
| if (!volume_info->UNCip || !volume_info->UNC) |
| goto out; |
| |
| rc = cifs_fill_sockaddr((struct sockaddr *)&addr, |
| volume_info->UNCip, |
| strlen(volume_info->UNCip), |
| volume_info->port); |
| if (!rc) |
| goto out; |
| |
| if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) || |
| !match_session(ses, volume_info) || |
| !match_tcon(tcon, volume_info->UNC)) { |
| rc = 0; |
| goto out; |
| } |
| |
| rc = compare_mount_options(sb, mnt_data); |
| out: |
| spin_unlock(&cifs_tcp_ses_lock); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| int |
| get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path, |
| const struct nls_table *nls_codepage, unsigned int *pnum_referrals, |
| struct dfs_info3_param **preferrals, int remap) |
| { |
| char *temp_unc; |
| int rc = 0; |
| |
| *pnum_referrals = 0; |
| *preferrals = NULL; |
| |
| if (pSesInfo->ipc_tid == 0) { |
| temp_unc = kmalloc(2 /* for slashes */ + |
| strnlen(pSesInfo->serverName, |
| SERVER_NAME_LEN_WITH_NULL * 2) |
| + 1 + 4 /* slash IPC$ */ + 2, |
| GFP_KERNEL); |
| if (temp_unc == NULL) |
| return -ENOMEM; |
| temp_unc[0] = '\\'; |
| temp_unc[1] = '\\'; |
| strcpy(temp_unc + 2, pSesInfo->serverName); |
| strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$"); |
| rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage); |
| cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid); |
| kfree(temp_unc); |
| } |
| if (rc == 0) |
| rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals, |
| pnum_referrals, nls_codepage, remap); |
| /* BB map targetUNCs to dfs_info3 structures, here or |
| in CIFSGetDFSRefer BB */ |
| |
| return rc; |
| } |
| |
| #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| static struct lock_class_key cifs_key[2]; |
| static struct lock_class_key cifs_slock_key[2]; |
| |
| static inline void |
| cifs_reclassify_socket4(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| BUG_ON(sock_owned_by_user(sk)); |
| sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS", |
| &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]); |
| } |
| |
| static inline void |
| cifs_reclassify_socket6(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| BUG_ON(sock_owned_by_user(sk)); |
| sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS", |
| &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]); |
| } |
| #else |
| static inline void |
| cifs_reclassify_socket4(struct socket *sock) |
| { |
| } |
| |
| static inline void |
| cifs_reclassify_socket6(struct socket *sock) |
| { |
| } |
| #endif |
| |
| /* See RFC1001 section 14 on representation of Netbios names */ |
| static void rfc1002mangle(char *target, char *source, unsigned int length) |
| { |
| unsigned int i, j; |
| |
| for (i = 0, j = 0; i < (length); i++) { |
| /* mask a nibble at a time and encode */ |
| target[j] = 'A' + (0x0F & (source[i] >> 4)); |
| target[j+1] = 'A' + (0x0F & source[i]); |
| j += 2; |
| } |
| |
| } |
| |
| static int |
| bind_socket(struct TCP_Server_Info *server) |
| { |
| int rc = 0; |
| if (server->srcaddr.ss_family != AF_UNSPEC) { |
| /* Bind to the specified local IP address */ |
| struct socket *socket = server->ssocket; |
| rc = socket->ops->bind(socket, |
| (struct sockaddr *) &server->srcaddr, |
| sizeof(server->srcaddr)); |
| if (rc < 0) { |
| struct sockaddr_in *saddr4; |
| struct sockaddr_in6 *saddr6; |
| saddr4 = (struct sockaddr_in *)&server->srcaddr; |
| saddr6 = (struct sockaddr_in6 *)&server->srcaddr; |
| if (saddr6->sin6_family == AF_INET6) |
| cERROR(1, "cifs: " |
| "Failed to bind to: %pI6c, error: %d\n", |
| &saddr6->sin6_addr, rc); |
| else |
| cERROR(1, "cifs: " |
| "Failed to bind to: %pI4, error: %d\n", |
| &saddr4->sin_addr.s_addr, rc); |
| } |
| } |
| return rc; |
| } |
| |
| static int |
| ip_rfc1001_connect(struct TCP_Server_Info *server) |
| { |
| int rc = 0; |
| /* |
| * some servers require RFC1001 sessinit before sending |
| * negprot - BB check reconnection in case where second |
| * sessinit is sent but no second negprot |
| */ |
| struct rfc1002_session_packet *ses_init_buf; |
| struct smb_hdr *smb_buf; |
| ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet), |
| GFP_KERNEL); |
| if (ses_init_buf) { |
| ses_init_buf->trailer.session_req.called_len = 32; |
| |
| if (server->server_RFC1001_name && |
| server->server_RFC1001_name[0] != 0) |
| rfc1002mangle(ses_init_buf->trailer. |
| session_req.called_name, |
| server->server_RFC1001_name, |
| RFC1001_NAME_LEN_WITH_NULL); |
| else |
| rfc1002mangle(ses_init_buf->trailer. |
| session_req.called_name, |
| DEFAULT_CIFS_CALLED_NAME, |
| RFC1001_NAME_LEN_WITH_NULL); |
| |
| ses_init_buf->trailer.session_req.calling_len = 32; |
| |
| /* |
| * calling name ends in null (byte 16) from old smb |
| * convention. |
| */ |
| if (server->workstation_RFC1001_name && |
| server->workstation_RFC1001_name[0] != 0) |
| rfc1002mangle(ses_init_buf->trailer. |
| session_req.calling_name, |
| server->workstation_RFC1001_name, |
| RFC1001_NAME_LEN_WITH_NULL); |
| else |
| rfc1002mangle(ses_init_buf->trailer. |
| session_req.calling_name, |
| "LINUX_CIFS_CLNT", |
| RFC1001_NAME_LEN_WITH_NULL); |
| |
| ses_init_buf->trailer.session_req.scope1 = 0; |
| ses_init_buf->trailer.session_req.scope2 = 0; |
| smb_buf = (struct smb_hdr *)ses_init_buf; |
| |
| /* sizeof RFC1002_SESSION_REQUEST with no scope */ |
| smb_buf->smb_buf_length = cpu_to_be32(0x81000044); |
| rc = smb_send(server, smb_buf, 0x44); |
| kfree(ses_init_buf); |
| /* |
| * RFC1001 layer in at least one server |
| * requires very short break before negprot |
| * presumably because not expecting negprot |
| * to follow so fast. This is a simple |
| * solution that works without |
| * complicating the code and causes no |
| * significant slowing down on mount |
| * for everyone else |
| */ |
| usleep_range(1000, 2000); |
| } |
| /* |
| * else the negprot may still work without this |
| * even though malloc failed |
| */ |
| |
| return rc; |
| } |
| |
| static int |
| generic_ip_connect(struct TCP_Server_Info *server) |
| { |
| int rc = 0; |
| __be16 sport; |
| int slen, sfamily; |
| struct socket *socket = server->ssocket; |
| struct sockaddr *saddr; |
| |
| saddr = (struct sockaddr *) &server->dstaddr; |
| |
| if (server->dstaddr.ss_family == AF_INET6) { |
| sport = ((struct sockaddr_in6 *) saddr)->sin6_port; |
| slen = sizeof(struct sockaddr_in6); |
| sfamily = AF_INET6; |
| } else { |
| sport = ((struct sockaddr_in *) saddr)->sin_port; |
| slen = sizeof(struct sockaddr_in); |
| sfamily = AF_INET; |
| } |
| |
| if (socket == NULL) { |
| rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM, |
| IPPROTO_TCP, &socket, 1); |
| if (rc < 0) { |
| cERROR(1, "Error %d creating socket", rc); |
| server->ssocket = NULL; |
| return rc; |
| } |
| |
| /* BB other socket options to set KEEPALIVE, NODELAY? */ |
| cFYI(1, "Socket created"); |
| server->ssocket = socket; |
| socket->sk->sk_allocation = GFP_NOFS; |
| if (sfamily == AF_INET6) |
| cifs_reclassify_socket6(socket); |
| else |
| cifs_reclassify_socket4(socket); |
| } |
| |
| rc = bind_socket(server); |
| if (rc < 0) |
| return rc; |
| |
| /* |
| * Eventually check for other socket options to change from |
| * the default. sock_setsockopt not used because it expects |
| * user space buffer |
| */ |
| socket->sk->sk_rcvtimeo = 7 * HZ; |
| socket->sk->sk_sndtimeo = 5 * HZ; |
| |
| /* make the bufsizes depend on wsize/rsize and max requests */ |
| if (server->noautotune) { |
| if (socket->sk->sk_sndbuf < (200 * 1024)) |
| socket->sk->sk_sndbuf = 200 * 1024; |
| if (socket->sk->sk_rcvbuf < (140 * 1024)) |
| socket->sk->sk_rcvbuf = 140 * 1024; |
| } |
| |
| if (server->tcp_nodelay) { |
| int val = 1; |
| rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY, |
| (char *)&val, sizeof(val)); |
| if (rc) |
| cFYI(1, "set TCP_NODELAY socket option error %d", rc); |
| } |
| |
| cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx", |
| socket->sk->sk_sndbuf, |
| socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo); |
| |
| rc = socket->ops->connect(socket, saddr, slen, 0); |
| if (rc < 0) { |
| cFYI(1, "Error %d connecting to server", rc); |
| sock_release(socket); |
| server->ssocket = NULL; |
| return rc; |
| } |
| |
| if (sport == htons(RFC1001_PORT)) |
| rc = ip_rfc1001_connect(server); |
| |
| return rc; |
| } |
| |
| static int |
| ip_connect(struct TCP_Server_Info *server) |
| { |
| __be16 *sport; |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr; |
| struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr; |
| |
| if (server->dstaddr.ss_family == AF_INET6) |
| sport = &addr6->sin6_port; |
| else |
| sport = &addr->sin_port; |
| |
| if (*sport == 0) { |
| int rc; |
| |
| /* try with 445 port at first */ |
| *sport = htons(CIFS_PORT); |
| |
| rc = generic_ip_connect(server); |
| if (rc >= 0) |
| return rc; |
| |
| /* if it failed, try with 139 port */ |
| *sport = htons(RFC1001_PORT); |
| } |
| |
| return generic_ip_connect(server); |
| } |
| |
| void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon, |
| struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info) |
| { |
| /* if we are reconnecting then should we check to see if |
| * any requested capabilities changed locally e.g. via |
| * remount but we can not do much about it here |
| * if they have (even if we could detect it by the following) |
| * Perhaps we could add a backpointer to array of sb from tcon |
| * or if we change to make all sb to same share the same |
| * sb as NFS - then we only have one backpointer to sb. |
| * What if we wanted to mount the server share twice once with |
| * and once without posixacls or posix paths? */ |
| __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); |
| |
| if (vol_info && vol_info->no_linux_ext) { |
| tcon->fsUnixInfo.Capability = 0; |
| tcon->unix_ext = 0; /* Unix Extensions disabled */ |
| cFYI(1, "Linux protocol extensions disabled"); |
| return; |
| } else if (vol_info) |
| tcon->unix_ext = 1; /* Unix Extensions supported */ |
| |
| if (tcon->unix_ext == 0) { |
| cFYI(1, "Unix extensions disabled so not set on reconnect"); |
| return; |
| } |
| |
| if (!CIFSSMBQFSUnixInfo(xid, tcon)) { |
| __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability); |
| cFYI(1, "unix caps which server supports %lld", cap); |
| /* check for reconnect case in which we do not |
| want to change the mount behavior if we can avoid it */ |
| if (vol_info == NULL) { |
| /* turn off POSIX ACL and PATHNAMES if not set |
| originally at mount time */ |
| if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0) |
| cap &= ~CIFS_UNIX_POSIX_ACL_CAP; |
| if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { |
| if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) |
| cERROR(1, "POSIXPATH support change"); |
| cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; |
| } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { |
| cERROR(1, "possible reconnect error"); |
| cERROR(1, "server disabled POSIX path support"); |
| } |
| } |
| |
| if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) |
| cERROR(1, "per-share encryption not supported yet"); |
| |
| cap &= CIFS_UNIX_CAP_MASK; |
| if (vol_info && vol_info->no_psx_acl) |
| cap &= ~CIFS_UNIX_POSIX_ACL_CAP; |
| else if (CIFS_UNIX_POSIX_ACL_CAP & cap) { |
| cFYI(1, "negotiated posix acl support"); |
| if (cifs_sb) |
| cifs_sb->mnt_cifs_flags |= |
| CIFS_MOUNT_POSIXACL; |
| } |
| |
| if (vol_info && vol_info->posix_paths == 0) |
| cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; |
| else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) { |
| cFYI(1, "negotiate posix pathnames"); |
| if (cifs_sb) |
| cifs_sb->mnt_cifs_flags |= |
| CIFS_MOUNT_POSIX_PATHS; |
| } |
| |
| cFYI(1, "Negotiate caps 0x%x", (int)cap); |
| #ifdef CONFIG_CIFS_DEBUG2 |
| if (cap & CIFS_UNIX_FCNTL_CAP) |
| cFYI(1, "FCNTL cap"); |
| if (cap & CIFS_UNIX_EXTATTR_CAP) |
| cFYI(1, "EXTATTR cap"); |
| if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) |
| cFYI(1, "POSIX path cap"); |
| if (cap & CIFS_UNIX_XATTR_CAP) |
| cFYI(1, "XATTR cap"); |
| if (cap & CIFS_UNIX_POSIX_ACL_CAP) |
| cFYI(1, "POSIX ACL cap"); |
| if (cap & CIFS_UNIX_LARGE_READ_CAP) |
| cFYI(1, "very large read cap"); |
| if (cap & CIFS_UNIX_LARGE_WRITE_CAP) |
| cFYI(1, "very large write cap"); |
| if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP) |
| cFYI(1, "transport encryption cap"); |
| if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) |
| cFYI(1, "mandatory transport encryption cap"); |
| #endif /* CIFS_DEBUG2 */ |
| if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) { |
| if (vol_info == NULL) { |
| cFYI(1, "resetting capabilities failed"); |
| } else |
| cERROR(1, "Negotiating Unix capabilities " |
| "with the server failed. Consider " |
| "mounting with the Unix Extensions\n" |
| "disabled, if problems are found, " |
| "by specifying the nounix mount " |
| "option."); |
| |
| } |
| } |
| } |
| |
| void cifs_setup_cifs_sb(struct smb_vol *pvolume_info, |
| struct cifs_sb_info *cifs_sb) |
| { |
| INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks); |
| |
| spin_lock_init(&cifs_sb->tlink_tree_lock); |
| cifs_sb->tlink_tree = RB_ROOT; |
| |
| /* |
| * Temporarily set r/wsize for matching superblock. If we end up using |
| * new sb then client will later negotiate it downward if needed. |
| */ |
| cifs_sb->rsize = pvolume_info->rsize; |
| cifs_sb->wsize = pvolume_info->wsize; |
| |
| cifs_sb->mnt_uid = pvolume_info->linux_uid; |
| cifs_sb->mnt_gid = pvolume_info->linux_gid; |
| if (pvolume_info->backupuid_specified) |
| cifs_sb->mnt_backupuid = pvolume_info->backupuid; |
| if (pvolume_info->backupgid_specified) |
| cifs_sb->mnt_backupgid = pvolume_info->backupgid; |
| cifs_sb->mnt_file_mode = pvolume_info->file_mode; |
| cifs_sb->mnt_dir_mode = pvolume_info->dir_mode; |
| cFYI(1, "file mode: 0x%hx dir mode: 0x%hx", |
| cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode); |
| |
| cifs_sb->actimeo = pvolume_info->actimeo; |
| cifs_sb->local_nls = pvolume_info->local_nls; |
| |
| if (pvolume_info->noperm) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM; |
| if (pvolume_info->setuids) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID; |
| if (pvolume_info->server_ino) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM; |
| if (pvolume_info->remap) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR; |
| if (pvolume_info->no_xattr) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR; |
| if (pvolume_info->sfu_emul) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL; |
| if (pvolume_info->nobrl) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL; |
| if (pvolume_info->nostrictsync) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC; |
| if (pvolume_info->mand_lock) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL; |
| if (pvolume_info->rwpidforward) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD; |
| if (pvolume_info->cifs_acl) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL; |
| if (pvolume_info->backupuid_specified) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID; |
| if (pvolume_info->backupgid_specified) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID; |
| if (pvolume_info->override_uid) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID; |
| if (pvolume_info->override_gid) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID; |
| if (pvolume_info->dynperm) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM; |
| if (pvolume_info->fsc) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE; |
| if (pvolume_info->multiuser) |
| cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER | |
| CIFS_MOUNT_NO_PERM); |
| if (pvolume_info->strict_io) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO; |
| if (pvolume_info->direct_io) { |
| cFYI(1, "mounting share using direct i/o"); |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO; |
| } |
| if (pvolume_info->mfsymlinks) { |
| if (pvolume_info->sfu_emul) { |
| cERROR(1, "mount option mfsymlinks ignored if sfu " |
| "mount option is used"); |
| } else { |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS; |
| } |
| } |
| |
| if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm)) |
| cERROR(1, "mount option dynperm ignored if cifsacl " |
| "mount option supported"); |
| } |
| |
| /* |
| * When the server supports very large reads and writes via POSIX extensions, |
| * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not |
| * including the RFC1001 length. |
| * |
| * Note that this might make for "interesting" allocation problems during |
| * writeback however as we have to allocate an array of pointers for the |
| * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096. |
| * |
| * For reads, there is a similar problem as we need to allocate an array |
| * of kvecs to handle the receive, though that should only need to be done |
| * once. |
| */ |
| #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) |
| #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) |
| |
| /* |
| * When the server doesn't allow large posix writes, only allow a rsize/wsize |
| * of 2^17-1 minus the size of the call header. That allows for a read or |
| * write up to the maximum size described by RFC1002. |
| */ |
| #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) |
| #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) |
| |
| /* |
| * The default wsize is 1M. find_get_pages seems to return a maximum of 256 |
| * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill |
| * a single wsize request with a single call. |
| */ |
| #define CIFS_DEFAULT_IOSIZE (1024 * 1024) |
| |
| /* |
| * Windows only supports a max of 60kb reads and 65535 byte writes. Default to |
| * those values when posix extensions aren't in force. In actuality here, we |
| * use 65536 to allow for a write that is a multiple of 4k. Most servers seem |
| * to be ok with the extra byte even though Windows doesn't send writes that |
| * are that large. |
| * |
| * Citation: |
| * |
| * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx |
| */ |
| #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) |
| #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) |
| |
| static unsigned int |
| cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info) |
| { |
| __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| unsigned int wsize; |
| |
| /* start with specified wsize, or default */ |
| if (pvolume_info->wsize) |
| wsize = pvolume_info->wsize; |
| else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) |
| wsize = CIFS_DEFAULT_IOSIZE; |
| else |
| wsize = CIFS_DEFAULT_NON_POSIX_WSIZE; |
| |
| /* can server support 24-bit write sizes? (via UNIX extensions) */ |
| if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) |
| wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE); |
| |
| /* |
| * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set? |
| * Limit it to max buffer offered by the server, minus the size of the |
| * WRITEX header, not including the 4 byte RFC1001 length. |
| */ |
| if (!(server->capabilities & CAP_LARGE_WRITE_X) || |
| (!(server->capabilities & CAP_UNIX) && |
| (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)))) |
| wsize = min_t(unsigned int, wsize, |
| server->maxBuf - sizeof(WRITE_REQ) + 4); |
| |
| /* hard limit of CIFS_MAX_WSIZE */ |
| wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE); |
| |
| return wsize; |
| } |
| |
| static unsigned int |
| cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info) |
| { |
| __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| unsigned int rsize, defsize; |
| |
| /* |
| * Set default value... |
| * |
| * HACK alert! Ancient servers have very small buffers. Even though |
| * MS-CIFS indicates that servers are only limited by the client's |
| * bufsize for reads, testing against win98se shows that it throws |
| * INVALID_PARAMETER errors if you try to request too large a read. |
| * |
| * If the server advertises a MaxBufferSize of less than one page, |
| * assume that it also can't satisfy reads larger than that either. |
| * |
| * FIXME: Is there a better heuristic for this? |
| */ |
| if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP)) |
| defsize = CIFS_DEFAULT_IOSIZE; |
| else if (server->capabilities & CAP_LARGE_READ_X) |
| defsize = CIFS_DEFAULT_NON_POSIX_RSIZE; |
| else if (server->maxBuf >= PAGE_CACHE_SIZE) |
| defsize = CIFSMaxBufSize; |
| else |
| defsize = server->maxBuf - sizeof(READ_RSP); |
| |
| rsize = pvolume_info->rsize ? pvolume_info->rsize : defsize; |
| |
| /* |
| * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to |
| * the client's MaxBufferSize. |
| */ |
| if (!(server->capabilities & CAP_LARGE_READ_X)) |
| rsize = min_t(unsigned int, CIFSMaxBufSize, rsize); |
| |
| /* hard limit of CIFS_MAX_RSIZE */ |
| rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE); |
| |
| return rsize; |
| } |
| |
| static int |
| is_path_accessible(int xid, struct cifs_tcon *tcon, |
| struct cifs_sb_info *cifs_sb, const char *full_path) |
| { |
| int rc; |
| FILE_ALL_INFO *pfile_info; |
| |
| pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| if (pfile_info == NULL) |
| return -ENOMEM; |
| |
| rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info, |
| 0 /* not legacy */, cifs_sb->local_nls, |
| cifs_sb->mnt_cifs_flags & |
| CIFS_MOUNT_MAP_SPECIAL_CHR); |
| |
| if (rc == -EOPNOTSUPP || rc == -EINVAL) |
| rc = SMBQueryInformation(xid, tcon, full_path, pfile_info, |
| cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
| CIFS_MOUNT_MAP_SPECIAL_CHR); |
| kfree(pfile_info); |
| return rc; |
| } |
| |
| static void |
| cleanup_volume_info_contents(struct smb_vol *volume_info) |
| { |
| kfree(volume_info->username); |
| kzfree(volume_info->password); |
| if (volume_info->UNCip != volume_info->UNC + 2) |
| kfree(volume_info->UNCip); |
| kfree(volume_info->UNC); |
| kfree(volume_info->domainname); |
| kfree(volume_info->iocharset); |
| kfree(volume_info->prepath); |
| } |
| |
| void |
| cifs_cleanup_volume_info(struct smb_vol *volume_info) |
| { |
| if (!volume_info) |
| return; |
| cleanup_volume_info_contents(volume_info); |
| kfree(volume_info); |
| } |
| |
| |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| /* build_path_to_root returns full path to root when |
| * we do not have an exiting connection (tcon) */ |
| static char * |
| build_unc_path_to_root(const struct smb_vol *vol, |
| const struct cifs_sb_info *cifs_sb) |
| { |
| char *full_path, *pos; |
| unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0; |
| unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1); |
| |
| full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL); |
| if (full_path == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| strncpy(full_path, vol->UNC, unc_len); |
| pos = full_path + unc_len; |
| |
| if (pplen) { |
| strncpy(pos, vol->prepath, pplen); |
| pos += pplen; |
| } |
| |
| *pos = '\0'; /* add trailing null */ |
| convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb)); |
| cFYI(1, "%s: full_path=%s", __func__, full_path); |
| return full_path; |
| } |
| |
| /* |
| * Perform a dfs referral query for a share and (optionally) prefix |
| * |
| * If a referral is found, cifs_sb->mountdata will be (re-)allocated |
| * to a string containing updated options for the submount. Otherwise it |
| * will be left untouched. |
| * |
| * Returns the rc from get_dfs_path to the caller, which can be used to |
| * determine whether there were referrals. |
| */ |
| static int |
| expand_dfs_referral(int xid, struct cifs_ses *pSesInfo, |
| struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb, |
| int check_prefix) |
| { |
| int rc; |
| unsigned int num_referrals = 0; |
| struct dfs_info3_param *referrals = NULL; |
| char *full_path = NULL, *ref_path = NULL, *mdata = NULL; |
| |
| full_path = build_unc_path_to_root(volume_info, cifs_sb); |
| if (IS_ERR(full_path)) |
| return PTR_ERR(full_path); |
| |
| /* For DFS paths, skip the first '\' of the UNC */ |
| ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1; |
| |
| rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls, |
| &num_referrals, &referrals, |
| cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); |
| |
| if (!rc && num_referrals > 0) { |
| char *fake_devname = NULL; |
| |
| mdata = cifs_compose_mount_options(cifs_sb->mountdata, |
| full_path + 1, referrals, |
| &fake_devname); |
| |
| free_dfs_info_array(referrals, num_referrals); |
| |
| if (IS_ERR(mdata)) { |
| rc = PTR_ERR(mdata); |
| mdata = NULL; |
| } else { |
| cleanup_volume_info_contents(volume_info); |
| memset(volume_info, '\0', sizeof(*volume_info)); |
| rc = cifs_setup_volume_info(volume_info, mdata, |
| fake_devname); |
| } |
| kfree(fake_devname); |
| kfree(cifs_sb->mountdata); |
| cifs_sb->mountdata = mdata; |
| } |
| kfree(full_path); |
| return rc; |
| } |
| #endif |
| |
| static int |
| cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data, |
| const char *devname) |
| { |
| int rc = 0; |
| |
| if (cifs_parse_mount_options(mount_data, devname, volume_info)) |
| return -EINVAL; |
| |
| if (volume_info->nullauth) { |
| cFYI(1, "Anonymous login"); |
| kfree(volume_info->username); |
| volume_info->username = NULL; |
| } else if (volume_info->username) { |
| /* BB fixme parse for domain name here */ |
| cFYI(1, "Username: %s", volume_info->username); |
| } else { |
| cifserror("No username specified"); |
| /* In userspace mount helper we can get user name from alternate |
| locations such as env variables and files on disk */ |
| return -EINVAL; |
| } |
| |
| /* this is needed for ASCII cp to Unicode converts */ |
| if (volume_info->iocharset == NULL) { |
| /* load_nls_default cannot return null */ |
| volume_info->local_nls = load_nls_default(); |
| } else { |
| volume_info->local_nls = load_nls(volume_info->iocharset); |
| if (volume_info->local_nls == NULL) { |
| cERROR(1, "CIFS mount error: iocharset %s not found", |
| volume_info->iocharset); |
| return -ELIBACC; |
| } |
| } |
| |
| return rc; |
| } |
| |
| struct smb_vol * |
| cifs_get_volume_info(char *mount_data, const char *devname) |
| { |
| int rc; |
| struct smb_vol *volume_info; |
| |
| volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL); |
| if (!volume_info) |
| return ERR_PTR(-ENOMEM); |
| |
| rc = cifs_setup_volume_info(volume_info, mount_data, devname); |
| if (rc) { |
| cifs_cleanup_volume_info(volume_info); |
| volume_info = ERR_PTR(rc); |
| } |
| |
| return volume_info; |
| } |
| |
| /* make sure ra_pages is a multiple of rsize */ |
| static inline unsigned int |
| cifs_ra_pages(struct cifs_sb_info *cifs_sb) |
| { |
| unsigned int reads; |
| unsigned int rsize_pages = cifs_sb->rsize / PAGE_CACHE_SIZE; |
| |
| if (rsize_pages >= default_backing_dev_info.ra_pages) |
| return default_backing_dev_info.ra_pages; |
| else if (rsize_pages == 0) |
| return rsize_pages; |
| |
| reads = default_backing_dev_info.ra_pages / rsize_pages; |
| return reads * rsize_pages; |
| } |
| |
| int |
| cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info) |
| { |
| int rc = 0; |
| int xid; |
| struct cifs_ses *pSesInfo; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *srvTcp; |
| char *full_path; |
| struct tcon_link *tlink; |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| int referral_walks_count = 0; |
| #endif |
| |
| rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY); |
| if (rc) |
| return rc; |
| |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| try_mount_again: |
| /* cleanup activities if we're chasing a referral */ |
| if (referral_walks_count) { |
| if (tcon) |
| cifs_put_tcon(tcon); |
| else if (pSesInfo) |
| cifs_put_smb_ses(pSesInfo); |
| |
| FreeXid(xid); |
| } |
| #endif |
| tcon = NULL; |
| pSesInfo = NULL; |
| srvTcp = NULL; |
| full_path = NULL; |
| tlink = NULL; |
| |
| xid = GetXid(); |
| |
| /* get a reference to a tcp session */ |
| srvTcp = cifs_get_tcp_session(volume_info); |
| if (IS_ERR(srvTcp)) { |
| rc = PTR_ERR(srvTcp); |
| bdi_destroy(&cifs_sb->bdi); |
| goto out; |
| } |
| |
| /* get a reference to a SMB session */ |
| pSesInfo = cifs_get_smb_ses(srvTcp, volume_info); |
| if (IS_ERR(pSesInfo)) { |
| rc = PTR_ERR(pSesInfo); |
| pSesInfo = NULL; |
| goto mount_fail_check; |
| } |
| |
| /* search for existing tcon to this server share */ |
| tcon = cifs_get_tcon(pSesInfo, volume_info); |
| if (IS_ERR(tcon)) { |
| rc = PTR_ERR(tcon); |
| tcon = NULL; |
| goto remote_path_check; |
| } |
| |
| /* tell server which Unix caps we support */ |
| if (tcon->ses->capabilities & CAP_UNIX) { |
| /* reset of caps checks mount to see if unix extensions |
| disabled for just this mount */ |
| reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info); |
| if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) && |
| (le64_to_cpu(tcon->fsUnixInfo.Capability) & |
| CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) { |
| rc = -EACCES; |
| goto mount_fail_check; |
| } |
| } else |
| tcon->unix_ext = 0; /* server does not support them */ |
| |
| /* do not care if following two calls succeed - informational */ |
| if (!tcon->ipc) { |
| CIFSSMBQFSDeviceInfo(xid, tcon); |
| CIFSSMBQFSAttributeInfo(xid, tcon); |
| } |
| |
| cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info); |
| cifs_sb->rsize = cifs_negotiate_rsize(tcon, volume_info); |
| |
| /* tune readahead according to rsize */ |
| cifs_sb->bdi.ra_pages = cifs_ra_pages(cifs_sb); |
| |
| remote_path_check: |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| /* |
| * Perform an unconditional check for whether there are DFS |
| * referrals for this path without prefix, to provide support |
| * for DFS referrals from w2k8 servers which don't seem to respond |
| * with PATH_NOT_COVERED to requests that include the prefix. |
| * Chase the referral if found, otherwise continue normally. |
| */ |
| if (referral_walks_count == 0) { |
| int refrc = expand_dfs_referral(xid, pSesInfo, volume_info, |
| cifs_sb, false); |
| if (!refrc) { |
| referral_walks_count++; |
| goto try_mount_again; |
| } |
| } |
| #endif |
| |
| /* check if a whole path is not remote */ |
| if (!rc && tcon) { |
| /* build_path_to_root works only when we have a valid tcon */ |
| full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon); |
| if (full_path == NULL) { |
| rc = -ENOMEM; |
| goto mount_fail_check; |
| } |
| rc = is_path_accessible(xid, tcon, cifs_sb, full_path); |
| if (rc != 0 && rc != -EREMOTE) { |
| kfree(full_path); |
| goto mount_fail_check; |
| } |
| kfree(full_path); |
| } |
| |
| /* get referral if needed */ |
| if (rc == -EREMOTE) { |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| if (referral_walks_count > MAX_NESTED_LINKS) { |
| /* |
| * BB: when we implement proper loop detection, |
| * we will remove this check. But now we need it |
| * to prevent an indefinite loop if 'DFS tree' is |
| * misconfigured (i.e. has loops). |
| */ |
| rc = -ELOOP; |
| goto mount_fail_check; |
| } |
| |
| rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb, |
| true); |
| |
| if (!rc) { |
| referral_walks_count++; |
| goto try_mount_again; |
| } |
| goto mount_fail_check; |
| #else /* No DFS support, return error on mount */ |
| rc = -EOPNOTSUPP; |
| #endif |
| } |
| |
| if (rc) |
| goto mount_fail_check; |
| |
| /* now, hang the tcon off of the superblock */ |
| tlink = kzalloc(sizeof *tlink, GFP_KERNEL); |
| if (tlink == NULL) { |
| rc = -ENOMEM; |
| goto mount_fail_check; |
| } |
| |
| tlink->tl_uid = pSesInfo->linux_uid; |
| tlink->tl_tcon = tcon; |
| tlink->tl_time = jiffies; |
| set_bit(TCON_LINK_MASTER, &tlink->tl_flags); |
| set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); |
| |
| cifs_sb->master_tlink = tlink; |
| spin_lock(&cifs_sb->tlink_tree_lock); |
| tlink_rb_insert(&cifs_sb->tlink_tree, tlink); |
| spin_unlock(&cifs_sb->tlink_tree_lock); |
| |
| queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks, |
| TLINK_IDLE_EXPIRE); |
| |
| mount_fail_check: |
| /* on error free sesinfo and tcon struct if needed */ |
| if (rc) { |
| /* If find_unc succeeded then rc == 0 so we can not end */ |
| /* up accidentally freeing someone elses tcon struct */ |
| if (tcon) |
| cifs_put_tcon(tcon); |
| else if (pSesInfo) |
| cifs_put_smb_ses(pSesInfo); |
| else |
| cifs_put_tcp_session(srvTcp); |
| bdi_destroy(&cifs_sb->bdi); |
| } |
| |
| out: |
| FreeXid(xid); |
| return rc; |
| } |
| |
| /* |
| * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon |
| * pointer may be NULL. |
| */ |
| int |
| CIFSTCon(unsigned int xid, struct cifs_ses *ses, |
| const char *tree, struct cifs_tcon *tcon, |
| const struct nls_table *nls_codepage) |
| { |
| struct smb_hdr *smb_buffer; |
| struct smb_hdr *smb_buffer_response; |
| TCONX_REQ *pSMB; |
| TCONX_RSP *pSMBr; |
| unsigned char *bcc_ptr; |
| int rc = 0; |
| int length; |
| __u16 bytes_left, count; |
| |
| if (ses == NULL) |
| return -EIO; |
| |
| smb_buffer = cifs_buf_get(); |
| if (smb_buffer == NULL) |
| return -ENOMEM; |
| |
| smb_buffer_response = smb_buffer; |
| |
| header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX, |
| NULL /*no tid */ , 4 /*wct */ ); |
| |
| smb_buffer->Mid = GetNextMid(ses->server); |
| smb_buffer->Uid = ses->Suid; |
| pSMB = (TCONX_REQ *) smb_buffer; |
| pSMBr = (TCONX_RSP *) smb_buffer_response; |
| |
| pSMB->AndXCommand = 0xFF; |
| pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO); |
| bcc_ptr = &pSMB->Password[0]; |
| if (!tcon || (ses->server->sec_mode & SECMODE_USER)) { |
| pSMB->PasswordLength = cpu_to_le16(1); /* minimum */ |
| *bcc_ptr = 0; /* password is null byte */ |
| bcc_ptr++; /* skip password */ |
| /* already aligned so no need to do it below */ |
| } else { |
| pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE); |
| /* BB FIXME add code to fail this if NTLMv2 or Kerberos |
| specified as required (when that support is added to |
| the vfs in the future) as only NTLM or the much |
| weaker LANMAN (which we do not send by default) is accepted |
| by Samba (not sure whether other servers allow |
| NTLMv2 password here) */ |
| #ifdef CONFIG_CIFS_WEAK_PW_HASH |
| if ((global_secflags & CIFSSEC_MAY_LANMAN) && |
| (ses->server->secType == LANMAN)) |
| calc_lanman_hash(tcon->password, ses->server->cryptkey, |
| ses->server->sec_mode & |
| SECMODE_PW_ENCRYPT ? true : false, |
| bcc_ptr); |
| else |
| #endif /* CIFS_WEAK_PW_HASH */ |
| rc = SMBNTencrypt(tcon->password, ses->server->cryptkey, |
| bcc_ptr, nls_codepage); |
| |
| bcc_ptr += CIFS_AUTH_RESP_SIZE; |
| if (ses->capabilities & CAP_UNICODE) { |
| /* must align unicode strings */ |
| *bcc_ptr = 0; /* null byte password */ |
| bcc_ptr++; |
| } |
| } |
| |
| if (ses->server->sec_mode & |
| (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
| |
| if (ses->capabilities & CAP_STATUS32) { |
| smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
| } |
| if (ses->capabilities & CAP_DFS) { |
| smb_buffer->Flags2 |= SMBFLG2_DFS; |
| } |
| if (ses->capabilities & CAP_UNICODE) { |
| smb_buffer->Flags2 |= SMBFLG2_UNICODE; |
| length = |
| cifs_strtoUTF16((__le16 *) bcc_ptr, tree, |
| 6 /* max utf8 char length in bytes */ * |
| (/* server len*/ + 256 /* share len */), nls_codepage); |
| bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */ |
| bcc_ptr += 2; /* skip trailing null */ |
| } else { /* ASCII */ |
| strcpy(bcc_ptr, tree); |
| bcc_ptr += strlen(tree) + 1; |
| } |
| strcpy(bcc_ptr, "?????"); |
| bcc_ptr += strlen("?????"); |
| bcc_ptr += 1; |
| count = bcc_ptr - &pSMB->Password[0]; |
| pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu( |
| pSMB->hdr.smb_buf_length) + count); |
| pSMB->ByteCount = cpu_to_le16(count); |
| |
| rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length, |
| 0); |
| |
| /* above now done in SendReceive */ |
| if ((rc == 0) && (tcon != NULL)) { |
| bool is_unicode; |
| |
| tcon->tidStatus = CifsGood; |
| tcon->need_reconnect = false; |
| tcon->tid = smb_buffer_response->Tid; |
| bcc_ptr = pByteArea(smb_buffer_response); |
| bytes_left = get_bcc(smb_buffer_response); |
| length = strnlen(bcc_ptr, bytes_left - 2); |
| if (smb_buffer->Flags2 & SMBFLG2_UNICODE) |
| is_unicode = true; |
| else |
| is_unicode = false; |
| |
| |
| /* skip service field (NB: this field is always ASCII) */ |
| if (length == 3) { |
| if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') && |
| (bcc_ptr[2] == 'C')) { |
| cFYI(1, "IPC connection"); |
| tcon->ipc = 1; |
| } |
| } else if (length == 2) { |
| if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) { |
| /* the most common case */ |
| cFYI(1, "disk share connection"); |
| } |
| } |
| bcc_ptr += length + 1; |
| bytes_left -= (length + 1); |
| strncpy(tcon->treeName, tree, MAX_TREE_SIZE); |
| |
| /* mostly informational -- no need to fail on error here */ |
| kfree(tcon->nativeFileSystem); |
| tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr, |
| bytes_left, is_unicode, |
| nls_codepage); |
| |
| cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem); |
| |
| if ((smb_buffer_response->WordCount == 3) || |
| (smb_buffer_response->WordCount == 7)) |
| /* field is in same location */ |
| tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport); |
| else |
| tcon->Flags = 0; |
| cFYI(1, "Tcon flags: 0x%x ", tcon->Flags); |
| } else if ((rc == 0) && tcon == NULL) { |
| /* all we need to save for IPC$ connection */ |
| ses->ipc_tid = smb_buffer_response->Tid; |
| } |
| |
| cifs_buf_release(smb_buffer); |
| return rc; |
| } |
| |
| void |
| cifs_umount(struct cifs_sb_info *cifs_sb) |
| { |
| struct rb_root *root = &cifs_sb->tlink_tree; |
| struct rb_node *node; |
| struct tcon_link *tlink; |
| |
| cancel_delayed_work_sync(&cifs_sb->prune_tlinks); |
| |
| spin_lock(&cifs_sb->tlink_tree_lock); |
| while ((node = rb_first(root))) { |
| tlink = rb_entry(node, struct tcon_link, tl_rbnode); |
| cifs_get_tlink(tlink); |
| clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); |
| rb_erase(node, root); |
| |
| spin_unlock(&cifs_sb->tlink_tree_lock); |
| cifs_put_tlink(tlink); |
| spin_lock(&cifs_sb->tlink_tree_lock); |
| } |
| spin_unlock(&cifs_sb->tlink_tree_lock); |
| |
| bdi_destroy(&cifs_sb->bdi); |
| kfree(cifs_sb->mountdata); |
| unload_nls(cifs_sb->local_nls); |
| kfree(cifs_sb); |
| } |
| |
| int cifs_negotiate_protocol(unsigned int xid, struct cifs_ses *ses) |
| { |
| int rc = 0; |
| struct TCP_Server_Info *server = ses->server; |
| |
| /* only send once per connect */ |
| if (server->maxBuf != 0) |
| return 0; |
| |
| rc = CIFSSMBNegotiate(xid, ses); |
| if (rc == -EAGAIN) { |
| /* retry only once on 1st time connection */ |
| rc = CIFSSMBNegotiate(xid, ses); |
| if (rc == -EAGAIN) |
| rc = -EHOSTDOWN; |
| } |
| if (rc == 0) { |
| spin_lock(&GlobalMid_Lock); |
| if (server->tcpStatus == CifsNeedNegotiate) |
| server->tcpStatus = CifsGood; |
| else |
| rc = -EHOSTDOWN; |
| spin_unlock(&GlobalMid_Lock); |
| |
| } |
| |
| return rc; |
| } |
| |
| |
| int cifs_setup_session(unsigned int xid, struct cifs_ses *ses, |
| struct nls_table *nls_info) |
| { |
| int rc = 0; |
| struct TCP_Server_Info *server = ses->server; |
| |
| ses->flags = 0; |
| ses->capabilities = server->capabilities; |
| if (linuxExtEnabled == 0) |
| ses->capabilities &= (~CAP_UNIX); |
| |
| cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d", |
| server->sec_mode, server->capabilities, server->timeAdj); |
| |
| rc = CIFS_SessSetup(xid, ses, nls_info); |
| if (rc) { |
| cERROR(1, "Send error in SessSetup = %d", rc); |
| } else { |
| mutex_lock(&ses->server->srv_mutex); |
| if (!server->session_estab) { |
| server->session_key.response = ses->auth_key.response; |
| server->session_key.len = ses->auth_key.len; |
| server->sequence_number = 0x2; |
| server->session_estab = true; |
| ses->auth_key.response = NULL; |
| } |
| mutex_unlock(&server->srv_mutex); |
| |
| cFYI(1, "CIFS Session Established successfully"); |
| spin_lock(&GlobalMid_Lock); |
| ses->status = CifsGood; |
| ses->need_reconnect = false; |
| spin_unlock(&GlobalMid_Lock); |
| } |
| |
| kfree(ses->auth_key.response); |
| ses->auth_key.response = NULL; |
| ses->auth_key.len = 0; |
| kfree(ses->ntlmssp); |
| ses->ntlmssp = NULL; |
| |
| return rc; |
| } |
| |
| static int |
| cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses) |
| { |
| switch (ses->server->secType) { |
| case Kerberos: |
| vol->secFlg = CIFSSEC_MUST_KRB5; |
| return 0; |
| case NTLMv2: |
| vol->secFlg = CIFSSEC_MUST_NTLMV2; |
| break; |
| case NTLM: |
| vol->secFlg = CIFSSEC_MUST_NTLM; |
| break; |
| case RawNTLMSSP: |
| vol->secFlg = CIFSSEC_MUST_NTLMSSP; |
| break; |
| case LANMAN: |
| vol->secFlg = CIFSSEC_MUST_LANMAN; |
| break; |
| } |
| |
| return cifs_set_cifscreds(vol, ses); |
| } |
| |
| static struct cifs_tcon * |
| cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid) |
| { |
| int rc; |
| struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb); |
| struct cifs_ses *ses; |
| struct cifs_tcon *tcon = NULL; |
| struct smb_vol *vol_info; |
| |
| vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL); |
| if (vol_info == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| vol_info->local_nls = cifs_sb->local_nls; |
| vol_info->linux_uid = fsuid; |
| vol_info->cred_uid = fsuid; |
| vol_info->UNC = master_tcon->treeName; |
| vol_info->retry = master_tcon->retry; |
| vol_info->nocase = master_tcon->nocase; |
| vol_info->local_lease = master_tcon->local_lease; |
| vol_info->no_linux_ext = !master_tcon->unix_ext; |
| |
| rc = cifs_set_vol_auth(vol_info, master_tcon->ses); |
| if (rc) { |
| tcon = ERR_PTR(rc); |
| goto out; |
| } |
| |
| /* get a reference for the same TCP session */ |
| spin_lock(&cifs_tcp_ses_lock); |
| ++master_tcon->ses->server->srv_count; |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info); |
| if (IS_ERR(ses)) { |
| tcon = (struct cifs_tcon *)ses; |
| cifs_put_tcp_session(master_tcon->ses->server); |
| goto out; |
| } |
| |
| tcon = cifs_get_tcon(ses, vol_info); |
| if (IS_ERR(tcon)) { |
| cifs_put_smb_ses(ses); |
| goto out; |
| } |
| |
| if (ses->capabilities & CAP_UNIX) |
| reset_cifs_unix_caps(0, tcon, NULL, vol_info); |
| out: |
| kfree(vol_info->username); |
| kfree(vol_info->password); |
| kfree(vol_info); |
| |
| return tcon; |
| } |
| |
| struct cifs_tcon * |
| cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb) |
| { |
| return tlink_tcon(cifs_sb_master_tlink(cifs_sb)); |
| } |
| |
| static int |
| cifs_sb_tcon_pending_wait(void *unused) |
| { |
| schedule(); |
| return signal_pending(current) ? -ERESTARTSYS : 0; |
| } |
| |
| /* find and return a tlink with given uid */ |
| static struct tcon_link * |
| tlink_rb_search(struct rb_root *root, uid_t uid) |
| { |
| struct rb_node *node = root->rb_node; |
| struct tcon_link *tlink; |
| |
| while (node) { |
| tlink = rb_entry(node, struct tcon_link, tl_rbnode); |
| |
| if (tlink->tl_uid > uid) |
| node = node->rb_left; |
| else if (tlink->tl_uid < uid) |
| node = node->rb_right; |
| else |
| return tlink; |
| } |
| return NULL; |
| } |
| |
| /* insert a tcon_link into the tree */ |
| static void |
| tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink) |
| { |
| struct rb_node **new = &(root->rb_node), *parent = NULL; |
| struct tcon_link *tlink; |
| |
| while (*new) { |
| tlink = rb_entry(*new, struct tcon_link, tl_rbnode); |
| parent = *new; |
| |
| if (tlink->tl_uid > new_tlink->tl_uid) |
| new = &((*new)->rb_left); |
| else |
| new = &((*new)->rb_right); |
| } |
| |
| rb_link_node(&new_tlink->tl_rbnode, parent, new); |
| rb_insert_color(&new_tlink->tl_rbnode, root); |
| } |
| |
| /* |
| * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the |
| * current task. |
| * |
| * If the superblock doesn't refer to a multiuser mount, then just return |
| * the master tcon for the mount. |
| * |
| * First, search the rbtree for an existing tcon for this fsuid. If one |
| * exists, then check to see if it's pending construction. If it is then wait |
| * for construction to complete. Once it's no longer pending, check to see if |
| * it failed and either return an error or retry construction, depending on |
| * the timeout. |
| * |
| * If one doesn't exist then insert a new tcon_link struct into the tree and |
| * try to construct a new one. |
| */ |
| struct tcon_link * |
| cifs_sb_tlink(struct cifs_sb_info *cifs_sb) |
| { |
| int ret; |
| uid_t fsuid = current_fsuid(); |
| struct tcon_link *tlink, *newtlink; |
| |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); |
| |
| spin_lock(&cifs_sb->tlink_tree_lock); |
| tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid); |
| if (tlink) |
| cifs_get_tlink(tlink); |
| spin_unlock(&cifs_sb->tlink_tree_lock); |
| |
| if (tlink == NULL) { |
| newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL); |
| if (newtlink == NULL) |
| return ERR_PTR(-ENOMEM); |
| newtlink->tl_uid = fsuid; |
| newtlink->tl_tcon = ERR_PTR(-EACCES); |
| set_bit(TCON_LINK_PENDING, &newtlink->tl_flags); |
| set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags); |
| cifs_get_tlink(newtlink); |
| |
| spin_lock(&cifs_sb->tlink_tree_lock); |
| /* was one inserted after previous search? */ |
| tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid); |
| if (tlink) { |
| cifs_get_tlink(tlink); |
| spin_unlock(&cifs_sb->tlink_tree_lock); |
| kfree(newtlink); |
| goto wait_for_construction; |
| } |
| tlink = newtlink; |
| tlink_rb_insert(&cifs_sb->tlink_tree, tlink); |
| spin_unlock(&cifs_sb->tlink_tree_lock); |
| } else { |
| wait_for_construction: |
| ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING, |
| cifs_sb_tcon_pending_wait, |
| TASK_INTERRUPTIBLE); |
| if (ret) { |
| cifs_put_tlink(tlink); |
| return ERR_PTR(ret); |
| } |
| |
| /* if it's good, return it */ |
| if (!IS_ERR(tlink->tl_tcon)) |
| return tlink; |
| |
| /* return error if we tried this already recently */ |
| if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) { |
| cifs_put_tlink(tlink); |
| return ERR_PTR(-EACCES); |
| } |
| |
| if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags)) |
| goto wait_for_construction; |
| } |
| |
| tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid); |
| clear_bit(TCON_LINK_PENDING, &tlink->tl_flags); |
| wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING); |
| |
| if (IS_ERR(tlink->tl_tcon)) { |
| cifs_put_tlink(tlink); |
| return ERR_PTR(-EACCES); |
| } |
| |
| return tlink; |
| } |
| |
| /* |
| * periodic workqueue job that scans tcon_tree for a superblock and closes |
| * out tcons. |
| */ |
| static void |
| cifs_prune_tlinks(struct work_struct *work) |
| { |
| struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info, |
| prune_tlinks.work); |
| struct rb_root *root = &cifs_sb->tlink_tree; |
| struct rb_node *node = rb_first(root); |
| struct rb_node *tmp; |
| struct tcon_link *tlink; |
| |
| /* |
| * Because we drop the spinlock in the loop in order to put the tlink |
| * it's not guarded against removal of links from the tree. The only |
| * places that remove entries from the tree are this function and |
| * umounts. Because this function is non-reentrant and is canceled |
| * before umount can proceed, this is safe. |
| */ |
| spin_lock(&cifs_sb->tlink_tree_lock); |
| node = rb_first(root); |
| while (node != NULL) { |
| tmp = node; |
| node = rb_next(tmp); |
| tlink = rb_entry(tmp, struct tcon_link, tl_rbnode); |
| |
| if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) || |
| atomic_read(&tlink->tl_count) != 0 || |
| time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies)) |
| continue; |
| |
| cifs_get_tlink(tlink); |
| clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); |
| rb_erase(tmp, root); |
| |
| spin_unlock(&cifs_sb->tlink_tree_lock); |
| cifs_put_tlink(tlink); |
| spin_lock(&cifs_sb->tlink_tree_lock); |
| } |
| spin_unlock(&cifs_sb->tlink_tree_lock); |
| |
| queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks, |
| TLINK_IDLE_EXPIRE); |
| } |