diff options
Diffstat (limited to 'fs/cifs/connect.c')
| -rw-r--r-- | fs/cifs/connect.c | 3009 |
1 files changed, 3009 insertions, 0 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c new file mode 100644 index 00000000..88c84a38 --- /dev/null +++ b/fs/cifs/connect.c @@ -0,0 +1,3009 @@ +/* + * 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 <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 "cn_cifs.h" +#include "fscache.h" + +#define CIFS_PORT 445 +#define RFC1001_PORT 139 + +extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, + unsigned char *p24); + +extern mempool_t *cifs_req_poolp; + +struct smb_vol { + char *username; + char *password; + char *domainname; + char *UNC; + char *UNCip; + char *iocharset; /* local code page for mapping to and from Unicode */ + char source_rfc1001_name[16]; /* netbios name of client */ + char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */ + uid_t cred_uid; + uid_t linux_uid; + gid_t linux_gid; + mode_t file_mode; + mode_t dir_mode; + unsigned secFlg; + bool retry:1; + bool intr:1; + bool setuids:1; + bool override_uid:1; + bool override_gid:1; + bool dynperm:1; + bool noperm:1; + bool no_psx_acl:1; /* set if posix acl support should be disabled */ + bool cifs_acl:1; + bool no_xattr:1; /* set if xattr (EA) support should be disabled*/ + bool server_ino:1; /* use inode numbers from server ie UniqueId */ + bool direct_io:1; + bool remap:1; /* set to remap seven reserved chars in filenames */ + bool posix_paths:1; /* unset to not ask for posix pathnames. */ + bool no_linux_ext:1; + bool sfu_emul:1; + bool nullauth:1; /* attempt to authenticate with null user */ + bool nocase:1; /* request case insensitive filenames */ + bool nobrl:1; /* disable sending byte range locks to srv */ + bool mand_lock:1; /* send mandatory not posix byte range lock reqs */ + bool seal:1; /* request transport encryption on share */ + bool nodfs:1; /* Do not request DFS, even if available */ + bool local_lease:1; /* check leases only on local system, not remote */ + bool noblocksnd:1; + bool noautotune:1; + bool nostrictsync:1; /* do not force expensive SMBflush on every sync */ + bool fsc:1; /* enable fscache */ + unsigned int rsize; + unsigned int wsize; + bool sockopt_tcp_nodelay:1; + unsigned short int port; + char *prepath; + struct nls_table *local_nls; +}; + +static int ipv4_connect(struct TCP_Server_Info *server); +static int ipv6_connect(struct TCP_Server_Info *server); + +/* + * 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 cifsSesInfo *ses; + struct cifsTconInfo *tcon; + struct mid_q_entry *mid_entry; + + 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 */ + read_lock(&cifs_tcp_ses_lock); + list_for_each(tmp, &server->smb_ses_list) { + ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list); + ses->need_reconnect = true; + ses->ipc_tid = 0; + list_for_each(tmp2, &ses->tcon_list) { + tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list); + tcon->need_reconnect = true; + } + } + read_unlock(&cifs_tcp_ses_lock); + /* do not want to be sending data on a socket we are freeing */ + 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; + } + + spin_lock(&GlobalMid_Lock); + list_for_each(tmp, &server->pending_mid_q) { + mid_entry = list_entry(tmp, struct + mid_q_entry, + qhead); + if (mid_entry->midState == MID_REQUEST_SUBMITTED) { + /* Mark other intransit requests as needing + retry so we do not immediately mark the + session bad again (ie after we reconnect + below) as they timeout too */ + mid_entry->midState = MID_RETRY_NEEDED; + } + } + spin_unlock(&GlobalMid_Lock); + mutex_unlock(&server->srv_mutex); + + while ((server->tcpStatus != CifsExiting) && + (server->tcpStatus != CifsGood)) { + try_to_freeze(); + if (server->addr.sockAddr6.sin6_family == AF_INET6) + rc = ipv6_connect(server); + else + rc = ipv4_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 = CifsGood; + server->sequence_number = 0; + spin_unlock(&GlobalMid_Lock); + /* atomic_set(&server->inFlight,0);*/ + wake_up(&server->response_q); + } + } + 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, unsigned int maxBufSize) +{ + struct smb_t2_rsp *pSMBt; + int total_data_size; + int data_in_this_rsp; + int remaining; + + 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 = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount); + data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount); + + remaining = total_data_size - data_in_this_rsp; + + if (remaining == 0) + return 0; + else if (remaining < 0) { + cFYI(1, "total data %d smaller than data in frame %d", + total_data_size, data_in_this_rsp); + return -EINVAL; + } else { + cFYI(1, "missing %d bytes from transact2, check next response", + remaining); + if (total_data_size > maxBufSize) { + cERROR(1, "TotalDataSize %d is over maximum buffer %d", + total_data_size, maxBufSize); + return -EINVAL; + } + return remaining; + } +} + +static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB) +{ + struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond; + struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB; + int total_data_size; + int total_in_buf; + int remaining; + int total_in_buf2; + char *data_area_of_target; + char *data_area_of_buf2; + __u16 byte_count; + + total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount); + + if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) { + cFYI(1, "total data size of primary and secondary t2 differ"); + } + + total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount); + + remaining = total_data_size - total_in_buf; + + if (remaining < 0) + return -EINVAL; + + if (remaining == 0) /* nothing to do, ignore */ + return 0; + + total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount); + if (remaining < total_in_buf2) { + cFYI(1, "transact2 2nd response contains too much data"); + } + + /* find end of first SMB data area */ + data_area_of_target = (char *)&pSMBt->hdr.Protocol + + le16_to_cpu(pSMBt->t2_rsp.DataOffset); + /* validate target area */ + + data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol + + le16_to_cpu(pSMB2->t2_rsp.DataOffset); + + data_area_of_target += total_in_buf; + + /* copy second buffer into end of first buffer */ + memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2); + total_in_buf += total_in_buf2; + pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf); + byte_count = le16_to_cpu(BCC_LE(pTargetSMB)); + byte_count += total_in_buf2; + BCC_LE(pTargetSMB) = cpu_to_le16(byte_count); + + byte_count = pTargetSMB->smb_buf_length; + byte_count += total_in_buf2; + + /* BB also add check that we are not beyond maximum buffer size */ + + pTargetSMB->smb_buf_length = byte_count; + + if (remaining == total_in_buf2) { + cFYI(1, "found the last secondary response"); + return 0; /* we are done */ + } else /* more responses to go */ + return 1; + +} + +static int +cifs_demultiplex_thread(struct TCP_Server_Info *server) +{ + int length; + unsigned int pdu_length, total_read; + struct smb_hdr *smb_buffer = NULL; + struct smb_hdr *bigbuf = NULL; + struct smb_hdr *smallbuf = NULL; + struct msghdr smb_msg; + struct kvec iov; + struct socket *csocket = server->ssocket; + struct list_head *tmp; + struct cifsSesInfo *ses; + struct task_struct *task_to_wake = NULL; + struct mid_q_entry *mid_entry; + char temp; + bool isLargeBuf = false; + bool isMultiRsp; + int reconnect; + + 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 (bigbuf == NULL) { + bigbuf = cifs_buf_get(); + if (!bigbuf) { + cERROR(1, "No memory for large SMB response"); + msleep(3000); + /* retry will check if exiting */ + continue; + } + } else if (isLargeBuf) { + /* we are reusing a dirty large buf, clear its start */ + memset(bigbuf, 0, sizeof(struct smb_hdr)); + } + + if (smallbuf == NULL) { + smallbuf = cifs_small_buf_get(); + if (!smallbuf) { + cERROR(1, "No memory for SMB response"); + msleep(1000); + /* retry will check if exiting */ + continue; + } + /* beginning of smb buffer is cleared in our buf_get */ + } else /* if existing small buf clear beginning */ + memset(smallbuf, 0, sizeof(struct smb_hdr)); + + isLargeBuf = false; + isMultiRsp = false; + smb_buffer = smallbuf; + iov.iov_base = smb_buffer; + iov.iov_len = 4; + smb_msg.msg_control = NULL; + smb_msg.msg_controllen = 0; + pdu_length = 4; /* enough to get RFC1001 header */ +incomplete_rcv: + length = + kernel_recvmsg(csocket, &smb_msg, + &iov, 1, pdu_length, 0 /* BB other flags? */); + + if (server->tcpStatus == CifsExiting) { + break; + } else if (server->tcpStatus == CifsNeedReconnect) { + cFYI(1, "Reconnect after server stopped responding"); + cifs_reconnect(server); + cFYI(1, "call to reconnect done"); + csocket = server->ssocket; + continue; + } else if (length == -ERESTARTSYS || + length == -EAGAIN || + length == -EINTR) { + msleep(1); /* minimum sleep to prevent looping + allowing socket to clear and app threads to set + tcpStatus CifsNeedReconnect if server hung */ + if (pdu_length < 4) { + iov.iov_base = (4 - pdu_length) + + (char *)smb_buffer; + iov.iov_len = pdu_length; + smb_msg.msg_control = NULL; + smb_msg.msg_controllen = 0; + goto incomplete_rcv; + } else + continue; + } else if (length <= 0) { + cFYI(1, "Reconnect after unexpected peek error %d", + length); + cifs_reconnect(server); + csocket = server->ssocket; + wake_up(&server->response_q); + continue; + } else if (length < pdu_length) { + cFYI(1, "requested %d bytes but only got %d bytes", + pdu_length, length); + pdu_length -= length; + msleep(1); + goto incomplete_rcv; + } + + /* The right amount was read from socket - 4 bytes */ + /* so we can now interpret the length field */ + + /* 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 */ + temp = *((char *) smb_buffer); + + /* Note that FC 1001 length is big endian on the wire, + but we convert it here so it is always manipulated + as host byte order */ + pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length); + smb_buffer->smb_buf_length = pdu_length; + + cFYI(1, "rfc1002 length 0x%x", pdu_length+4); + + if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) { + continue; + } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) { + cFYI(1, "Good RFC 1002 session rsp"); + continue; + } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) { + /* we get this from Windows 98 instead of + an error on SMB negprot response */ + cFYI(1, "Negative RFC1002 Session Response Error 0x%x)", + pdu_length); + /* 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->addr.sockAddr, CIFS_PORT); + cifs_reconnect(server); + csocket = server->ssocket; + wake_up(&server->response_q); + continue; + } else if (temp != (char) 0) { + cERROR(1, "Unknown RFC 1002 frame"); + cifs_dump_mem(" Received Data: ", (char *)smb_buffer, + length); + cifs_reconnect(server); + csocket = server->ssocket; + continue; + } + + /* else we have an SMB response */ + if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) || + (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) { + cERROR(1, "Invalid size SMB length %d pdu_length %d", + length, pdu_length+4); + cifs_reconnect(server); + csocket = server->ssocket; + wake_up(&server->response_q); + continue; + } + + /* else length ok */ + reconnect = 0; + + if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) { + isLargeBuf = true; + memcpy(bigbuf, smallbuf, 4); + smb_buffer = bigbuf; + } + length = 0; + iov.iov_base = 4 + (char *)smb_buffer; + iov.iov_len = pdu_length; + for (total_read = 0; total_read < pdu_length; + total_read += length) { + length = kernel_recvmsg(csocket, &smb_msg, &iov, 1, + pdu_length - total_read, 0); + if (server->tcpStatus == CifsExiting) { + /* then will exit */ + reconnect = 2; + break; + } else if (server->tcpStatus == CifsNeedReconnect) { + cifs_reconnect(server); + csocket = server->ssocket; + /* Reconnect wakes up rspns q */ + /* Now we will reread sock */ + reconnect = 1; + break; + } else if (length == -ERESTARTSYS || + length == -EAGAIN || + length == -EINTR) { + msleep(1); /* minimum sleep to prevent looping, + allowing socket to clear and app + threads to set tcpStatus + CifsNeedReconnect if server hung*/ + length = 0; + continue; + } else if (length <= 0) { + cERROR(1, "Received no data, expecting %d", + pdu_length - total_read); + cifs_reconnect(server); + csocket = server->ssocket; + reconnect = 1; + break; + } + } + if (reconnect == 2) + break; + else if (reconnect == 1) + continue; + + length += 4; /* account for rfc1002 hdr */ + + + dump_smb(smb_buffer, length); + if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) { + cifs_dump_mem("Bad SMB: ", smb_buffer, 48); + continue; + } + + + task_to_wake = NULL; + spin_lock(&GlobalMid_Lock); + list_for_each(tmp, &server->pending_mid_q) { + mid_entry = list_entry(tmp, struct mid_q_entry, qhead); + + if ((mid_entry->mid == smb_buffer->Mid) && + (mid_entry->midState == MID_REQUEST_SUBMITTED) && + (mid_entry->command == smb_buffer->Command)) { + if (check2ndT2(smb_buffer,server->maxBuf) > 0) { + /* We have a multipart transact2 resp */ + isMultiRsp = true; + if (mid_entry->resp_buf) { + /* merge response - fix up 1st*/ + if (coalesce_t2(smb_buffer, + mid_entry->resp_buf)) { + mid_entry->multiRsp = + true; + break; + } else { + /* all parts received */ + mid_entry->multiEnd = + true; + goto multi_t2_fnd; + } + } else { + if (!isLargeBuf) { + cERROR(1, "1st trans2 resp needs bigbuf"); + /* BB maybe we can fix this up, switch + to already allocated large buffer? */ + } else { + /* Have first buffer */ + mid_entry->resp_buf = + smb_buffer; + mid_entry->largeBuf = + true; + bigbuf = NULL; + } + } + break; + } + mid_entry->resp_buf = smb_buffer; + mid_entry->largeBuf = isLargeBuf; +multi_t2_fnd: + task_to_wake = mid_entry->tsk; + mid_entry->midState = MID_RESPONSE_RECEIVED; +#ifdef CONFIG_CIFS_STATS2 + mid_entry->when_received = jiffies; +#endif + /* so we do not time out requests to server + which is still responding (since server could + be busy but not dead) */ + server->lstrp = jiffies; + break; + } + } + spin_unlock(&GlobalMid_Lock); + if (task_to_wake) { + /* Was previous buf put in mpx struct for multi-rsp? */ + if (!isMultiRsp) { + /* smb buffer will be freed by user thread */ + if (isLargeBuf) + bigbuf = NULL; + else + smallbuf = NULL; + } + wake_up_process(task_to_wake); + } else if (!is_valid_oplock_break(smb_buffer, server) && + !isMultiRsp) { + cERROR(1, "No task to wake, unknown frame received! " + "NumMids %d", midCount.counter); + cifs_dump_mem("Received Data is: ", (char *)smb_buffer, + sizeof(struct smb_hdr)); +#ifdef CONFIG_CIFS_DEBUG2 + cifs_dump_detail(smb_buffer); + cifs_dump_mids(server); +#endif /* CIFS_DEBUG2 */ + + } + } /* end while !EXITING */ + + /* take it off the list, if it's not already */ + write_lock(&cifs_tcp_ses_lock); + list_del_init(&server->tcp_ses_list); + write_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(csocket); + server->ssocket = NULL; + } + /* buffer usuallly freed in free_mid - need to free it here on exit */ + cifs_buf_release(bigbuf); + if (smallbuf) /* no sense logging a debug message if NULL */ + cifs_small_buf_release(smallbuf); + + /* + * BB: we shouldn't have to do any of this. It shouldn't be + * possible to exit from the thread with active SMB sessions + */ + read_lock(&cifs_tcp_ses_lock); + if (list_empty(&server->pending_mid_q)) { + /* loop through server session structures attached to this and + mark them dead */ + list_for_each(tmp, &server->smb_ses_list) { + ses = list_entry(tmp, struct cifsSesInfo, + smb_ses_list); + ses->status = CifsExiting; + ses->server = NULL; + } + read_unlock(&cifs_tcp_ses_lock); + } else { + /* although we can not zero the server struct pointer yet, + since there are active requests which may depnd on them, + mark the corresponding SMB sessions as exiting too */ + list_for_each(tmp, &server->smb_ses_list) { + ses = list_entry(tmp, struct cifsSesInfo, + smb_ses_list); + ses->status = CifsExiting; + } + + spin_lock(&GlobalMid_Lock); + list_for_each(tmp, &server->pending_mid_q) { + mid_entry = list_entry(tmp, struct mid_q_entry, qhead); + if (mid_entry->midState == MID_REQUEST_SUBMITTED) { + cFYI(1, "Clearing Mid 0x%x - waking up ", + mid_entry->mid); + task_to_wake = mid_entry->tsk; + if (task_to_wake) + wake_up_process(task_to_wake); + } + } + spin_unlock(&GlobalMid_Lock); + read_unlock(&cifs_tcp_ses_lock); + /* 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 */ + } + + /* last chance to mark ses pointers invalid + if there are any pointing to this (e.g + if a crazy root user tried to kill cifsd + kernel thread explicitly this might happen) */ + /* BB: This shouldn't be necessary, see above */ + read_lock(&cifs_tcp_ses_lock); + list_for_each(tmp, &server->smb_ses_list) { + ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list); + ses->server = NULL; + } + read_unlock(&cifs_tcp_ses_lock); + + kfree(server->hostname); + task_to_wake = xchg(&server->tsk, NULL); + kfree(server); + + length = atomic_dec_return(&tcpSesAllocCount); + if (length > 0) + mempool_resize(cifs_req_poolp, length + cifs_min_rcv, + GFP_KERNEL); + + /* 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(char *options, const char *devname, + struct smb_vol *vol) +{ + char *value; + char *data; + 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; + + separator[0] = ','; + separator[1] = 0; + + if (Local_System_Name[0] != 0) + memcpy(vol->source_rfc1001_name, Local_System_Name, 15); + else { + char *nodename = utsname()->nodename; + int n = strnlen(nodename, 15); + memset(vol->source_rfc1001_name, 0x20, 15); + for (i = 0; i < n; i++) { + /* 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 */ + vol->source_rfc1001_name[i] = toupper(nodename[i]); + } + } + vol->source_rfc1001_name[15] = 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; + + if (!options) + return 1; + + if (strncmp(options, "sep=", 4) == 0) { + if (options[4] != 0) { + separator[0] = options[4]; + options += 5; + } else { + cFYI(1, "Null separator not allowed"); + } + } + + 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"); + return 1; /* needs_arg; */ + } else if (!*value) { + /* null user, ie anonymous, authentication */ + vol->nullauth = 1; + } + if (strnlen(value, 200) < 200) { + vol->username = value; + } else { + printk(KERN_WARNING "CIFS: username too long\n"); + return 1; + } + } 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+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"); + return 1; + } + 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"); + return 1; + } + 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 = value; + } else { + printk(KERN_WARNING "CIFS: ip address " + "too long\n"); + return 1; + } + } 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"); + return 1; + } else if (strnicmp(value, "krb5", 4) == 0) { + vol->secFlg |= CIFSSEC_MAY_KRB5; +#ifdef CONFIG_CIFS_EXPERIMENTAL + } 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; +#endif + } 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); + return 1; + } + } 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"); + return 1; /* needs_arg; */ + } + if ((temp_len = strnlen(value, 300)) < 300) { + vol->UNC = kmalloc(temp_len+1, GFP_KERNEL); + if (vol->UNC == NULL) + return 1; + 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"); + return 1; + } + } else { + printk(KERN_WARNING "CIFS: UNC name too long\n"); + return 1; + } + } else if ((strnicmp(data, "domain", 3) == 0) + || (strnicmp(data, "workgroup", 5) == 0)) { + if (!value || !*value) { + printk(KERN_WARNING "CIFS: invalid domain name\n"); + return 1; /* needs_arg; */ + } + /* 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 = value; + cFYI(1, "Domain name set"); + } else { + printk(KERN_WARNING "CIFS: domain name too " + "long\n"); + return 1; + } + } else if (strnicmp(data, "prefixpath", 10) == 0) { + if (!value || !*value) { + printk(KERN_WARNING + "CIFS: invalid path prefix\n"); + return 1; /* needs_argument */ + } + 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) + return 1; + 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"); + return 1; + } + } else if (strnicmp(data, "iocharset", 9) == 0) { + if (!value || !*value) { + printk(KERN_WARNING "CIFS: invalid iocharset " + "specified\n"); + return 1; /* needs_arg; */ + } + if (strnlen(value, 65) < 65) { + if (strnicmp(value, "default", 7)) + vol->iocharset = value; + /* 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"); + return 1; + } + } else if (!strnicmp(data, "uid", 3) && value && *value) { + vol->linux_uid = simple_strtoul(value, &value, 0); + uid_specified = true; + } 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, 15); + 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)? */ + + /* We do not uppercase netbiosname for user */ + if (value[i] == 0) + break; + else + vol->source_rfc1001_name[i] = + value[i]; + } + /* The string has 16th byte zero still from + set at top of the function */ + if ((i == 15) && (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, 16); + + 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 == 15) && (value[i] != 0)) + printk(KERN_WARNING "CIFS: server net" + "biosname longer than 15 truncated.\n"); + } + } 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) { + /* 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, "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; +#ifdef CONFIG_CIFS_EXPERIMENTAL + } else if (strnicmp(data, "locallease", 6) == 0) { + vol->local_lease = 1; +#endif + } 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, "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) { + vol->fsc = 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"); + return 1; + } + if ((temp_len = strnlen(devname, 300)) < 300) { + vol->UNC = kmalloc(temp_len+1, GFP_KERNEL); + if (vol->UNC == NULL) + return 1; + 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"); + return 1; + } + value = strpbrk(vol->UNC+2, "/\\"); + if (value) + *value = '\\'; + } else { + printk(KERN_WARNING "CIFS: UNC name too long\n"); + return 1; + } + } + 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"); + + return 0; +} + +static bool +match_address(struct TCP_Server_Info *server, struct sockaddr *addr) +{ + struct sockaddr_in *addr4 = (struct sockaddr_in *)addr; + struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr; + + switch (addr->sa_family) { + case AF_INET: + if (addr4->sin_addr.s_addr != + server->addr.sockAddr.sin_addr.s_addr) + return false; + if (addr4->sin_port && + addr4->sin_port != server->addr.sockAddr.sin_port) + return false; + break; + case AF_INET6: + if (!ipv6_addr_equal(&addr6->sin6_addr, + &server->addr.sockAddr6.sin6_addr)) + return false; + if (addr6->sin6_scope_id != + server->addr.sockAddr6.sin6_scope_id) + return false; + if (addr6->sin6_port && + addr6->sin6_port != server->addr.sockAddr6.sin6_port) + return false; + break; + } + + 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 acceptible */ + if ((secFlags & CIFSSEC_MAY_SIGN) == 0 && + (server->secMode & SECMODE_SIGN_REQUIRED)) + return false; + else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) && + (server->secMode & + (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0) + return false; + + return true; +} + +static struct TCP_Server_Info * +cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol) +{ + struct TCP_Server_Info *server; + + write_lock(&cifs_tcp_ses_lock); + list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { + /* + * the demux thread can exit on its own while still in CifsNew + * so don't accept any sockets in that state. Since the + * tcpStatus never changes back to CifsNew it's safe to check + * for this without a lock. + */ + if (server->tcpStatus == CifsNew) + continue; + + if (!match_address(server, addr)) + continue; + + if (!match_security(server, vol)) + continue; + + ++server->srv_count; + write_unlock(&cifs_tcp_ses_lock); + cFYI(1, "Existing tcp session with server found"); + return server; + } + write_unlock(&cifs_tcp_ses_lock); + return NULL; +} + +static void +cifs_put_tcp_session(struct TCP_Server_Info *server) +{ + struct task_struct *task; + + write_lock(&cifs_tcp_ses_lock); + if (--server->srv_count > 0) { + write_unlock(&cifs_tcp_ses_lock); + return; + } + + list_del_init(&server->tcp_ses_list); + write_unlock(&cifs_tcp_ses_lock); + + spin_lock(&GlobalMid_Lock); + server->tcpStatus = CifsExiting; + spin_unlock(&GlobalMid_Lock); + + cifs_fscache_release_client_cookie(server); + + 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; + } + + tcp_ses->hostname = extract_hostname(volume_info->UNC); + if (IS_ERR(tcp_ses->hostname)) { + rc = PTR_ERR(tcp_ses->hostname); + goto out_err; + } + + 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->sequence_number = 0; + INIT_LIST_HEAD(&tcp_ses->tcp_ses_list); + INIT_LIST_HEAD(&tcp_ses->smb_ses_list); + + /* + * 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; + ++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->addr.sockAddr6, sin_server6, + sizeof(struct sockaddr_in6)); + rc = ipv6_connect(tcp_ses); + } else { + memcpy(&tcp_ses->addr.sockAddr, sin_server, + sizeof(struct sockaddr_in)); + rc = ipv4_connect(tcp_ses); + } + if (rc < 0) { + cERROR(1, "Error connecting to socket. Aborting operation"); + goto out_err; + } + + /* + * 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((void *)(void *)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; + } + + /* thread spawned, put it on the list */ + write_lock(&cifs_tcp_ses_lock); + list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list); + write_unlock(&cifs_tcp_ses_lock); + + cifs_fscache_get_client_cookie(tcp_ses); + + return 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 struct cifsSesInfo * +cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol) +{ + struct cifsSesInfo *ses; + + write_lock(&cifs_tcp_ses_lock); + list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { + switch (server->secType) { + case Kerberos: + if (vol->cred_uid != ses->cred_uid) + continue; + break; + default: + /* anything else takes username/password */ + if (strncmp(ses->userName, vol->username, + MAX_USERNAME_SIZE)) + continue; + if (strlen(vol->username) != 0 && + ses->password != NULL && + strncmp(ses->password, + vol->password ? vol->password : "", + MAX_PASSWORD_SIZE)) + continue; + } + ++ses->ses_count; + write_unlock(&cifs_tcp_ses_lock); + return ses; + } + write_unlock(&cifs_tcp_ses_lock); + return NULL; +} + +static void +cifs_put_smb_ses(struct cifsSesInfo *ses) +{ + int xid; + struct TCP_Server_Info *server = ses->server; + + cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count); + write_lock(&cifs_tcp_ses_lock); + if (--ses->ses_count > 0) { + write_unlock(&cifs_tcp_ses_lock); + return; + } + + list_del_init(&ses->smb_ses_list); + write_unlock(&cifs_tcp_ses_lock); + + if (ses->status == CifsGood) { + xid = GetXid(); + CIFSSMBLogoff(xid, ses); + _FreeXid(xid); + } + sesInfoFree(ses); + cifs_put_tcp_session(server); +} + +static struct cifsSesInfo * +cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info) +{ + int rc = -ENOMEM, xid; + struct cifsSesInfo *ses; + + 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->addr.sockAddr6.sin6_family == AF_INET6) + sprintf(ses->serverName, "%pI6", + &server->addr.sockAddr6.sin6_addr); + else + sprintf(ses->serverName, "%pI4", + &server->addr.sockAddr.sin_addr.s_addr); + + if (volume_info->username) + strncpy(ses->userName, volume_info->username, + MAX_USERNAME_SIZE); + + /* 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) { + int len = strlen(volume_info->domainname); + ses->domainName = kmalloc(len + 1, GFP_KERNEL); + if (ses->domainName) + strcpy(ses->domainName, volume_info->domainname); + } + ses->cred_uid = volume_info->cred_uid; + ses->linux_uid = volume_info->linux_uid; + 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 */ + write_lock(&cifs_tcp_ses_lock); + list_add(&ses->smb_ses_list, &server->smb_ses_list); + write_unlock(&cifs_tcp_ses_lock); + + FreeXid(xid); + return ses; + +get_ses_fail: + sesInfoFree(ses); + FreeXid(xid); + return ERR_PTR(rc); +} + +static struct cifsTconInfo * +cifs_find_tcon(struct cifsSesInfo *ses, const char *unc) +{ + struct list_head *tmp; + struct cifsTconInfo *tcon; + + write_lock(&cifs_tcp_ses_lock); + list_for_each(tmp, &ses->tcon_list) { + tcon = list_entry(tmp, struct cifsTconInfo, tcon_list); + if (tcon->tidStatus == CifsExiting) + continue; + if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE)) + continue; + + ++tcon->tc_count; + write_unlock(&cifs_tcp_ses_lock); + return tcon; + } + write_unlock(&cifs_tcp_ses_lock); + return NULL; +} + +static void +cifs_put_tcon(struct cifsTconInfo *tcon) +{ + int xid; + struct cifsSesInfo *ses = tcon->ses; + + cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count); + write_lock(&cifs_tcp_ses_lock); + if (--tcon->tc_count > 0) { + write_unlock(&cifs_tcp_ses_lock); + return; + } + + list_del_init(&tcon->tcon_list); + write_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 cifsTconInfo * +cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info) +{ + int rc, xid; + struct cifsTconInfo *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; + + write_lock(&cifs_tcp_ses_lock); + list_add(&tcon->tcon_list, &ses->tcon_list); + write_unlock(&cifs_tcp_ses_lock); + + cifs_fscache_get_super_cookie(tcon); + + return tcon; + +out_fail: + tconInfoFree(tcon); + return ERR_PTR(rc); +} + + +int +get_dfs_path(int xid, struct cifsSesInfo *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 +ipv4_connect(struct TCP_Server_Info *server) +{ + int rc = 0; + int val; + bool connected = false; + __be16 orig_port = 0; + struct socket *socket = server->ssocket; + + if (socket == NULL) { + rc = sock_create_kern(PF_INET, SOCK_STREAM, + IPPROTO_TCP, &socket); + if (rc < 0) { + cERROR(1, "Error %d creating socket", rc); + return rc; + } + + /* BB other socket options to set KEEPALIVE, NODELAY? */ + cFYI(1, "Socket created"); + server->ssocket = socket; + socket->sk->sk_allocation = GFP_NOFS; + cifs_reclassify_socket4(socket); + } + + /* user overrode default port */ + if (server->addr.sockAddr.sin_port) { + rc = socket->ops->connect(socket, (struct sockaddr *) + &server->addr.sockAddr, + sizeof(struct sockaddr_in), 0); + if (rc >= 0) + connected = true; + } + + if (!connected) { + /* save original port so we can retry user specified port + later if fall back ports fail this time */ + orig_port = server->addr.sockAddr.sin_port; + + /* do not retry on the same port we just failed on */ + if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) { + server->addr.sockAddr.sin_port = htons(CIFS_PORT); + rc = socket->ops->connect(socket, + (struct sockaddr *) + &server->addr.sockAddr, + sizeof(struct sockaddr_in), 0); + if (rc >= 0) + connected = true; + } + } + if (!connected) { + server->addr.sockAddr.sin_port = htons(RFC1001_PORT); + rc = socket->ops->connect(socket, (struct sockaddr *) + &server->addr.sockAddr, + sizeof(struct sockaddr_in), 0); + if (rc >= 0) + connected = true; + } + + /* give up here - unless we want to retry on different + protocol families some day */ + if (!connected) { + if (orig_port) + server->addr.sockAddr.sin_port = orig_port; + cFYI(1, "Error %d connecting to server via ipv4", rc); + sock_release(socket); + server->ssocket = NULL; + 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) { + 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); + + /* send RFC1001 sessinit */ + if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) { + /* 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 = 0x81000044; + rc = smb_send(server, smb_buf, 0x44); + kfree(ses_init_buf); + msleep(1); /* 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 */ + } + /* else the negprot may still work without this + even though malloc failed */ + + } + + return rc; +} + +static int +ipv6_connect(struct TCP_Server_Info *server) +{ + int rc = 0; + int val; + bool connected = false; + __be16 orig_port = 0; + struct socket *socket = server->ssocket; + + if (socket == NULL) { + rc = sock_create_kern(PF_INET6, SOCK_STREAM, + IPPROTO_TCP, &socket); + if (rc < 0) { + cERROR(1, "Error %d creating ipv6 socket", rc); + socket = NULL; + return rc; + } + + /* BB other socket options to set KEEPALIVE, NODELAY? */ + cFYI(1, "ipv6 Socket created"); + server->ssocket = socket; + socket->sk->sk_allocation = GFP_NOFS; + cifs_reclassify_socket6(socket); + } + + /* user overrode default port */ + if (server->addr.sockAddr6.sin6_port) { + rc = socket->ops->connect(socket, + (struct sockaddr *) &server->addr.sockAddr6, + sizeof(struct sockaddr_in6), 0); + if (rc >= 0) + connected = true; + } + + if (!connected) { + /* save original port so we can retry user specified port + later if fall back ports fail this time */ + + orig_port = server->addr.sockAddr6.sin6_port; + /* do not retry on the same port we just failed on */ + if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) { + server->addr.sockAddr6.sin6_port = htons(CIFS_PORT); + rc = socket->ops->connect(socket, (struct sockaddr *) + &server->addr.sockAddr6, + sizeof(struct sockaddr_in6), 0); + if (rc >= 0) + connected = true; + } + } + if (!connected) { + server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT); + rc = socket->ops->connect(socket, (struct sockaddr *) + &server->addr.sockAddr6, + sizeof(struct sockaddr_in6), 0); + if (rc >= 0) + connected = true; + } + + /* give up here - unless we want to retry on different + protocol families some day */ + if (!connected) { + if (orig_port) + server->addr.sockAddr6.sin6_port = orig_port; + cFYI(1, "Error %d connecting to server via ipv6", rc); + sock_release(socket); + server->ssocket = NULL; + 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; + + if (server->tcp_nodelay) { + 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); + } + + server->ssocket = socket; + + return rc; +} + +void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon, + struct super_block *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); + + /* 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"); + } + } + + 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 (sb) + sb->s_flags |= MS_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 (sb) + CIFS_SB(sb)->mnt_cifs_flags |= + CIFS_MOUNT_POSIX_PATHS; + } + + /* We might be setting the path sep back to a different + form if we are reconnecting and the server switched its + posix path capability for this share */ + if (sb && (CIFS_SB(sb)->prepathlen > 0)) + CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb)); + + if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) { + if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) { + CIFS_SB(sb)->rsize = 127 * 1024; + cFYI(DBG2, "larger reads not supported by srv"); + } + } + + + 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"); +#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."); + + } + } +} + +static void +convert_delimiter(char *path, char delim) +{ + int i; + char old_delim; + + if (path == NULL) + return; + + if (delim == '/') + old_delim = '\\'; + else + old_delim = '/'; + + for (i = 0; path[i] != '\0'; i++) { + if (path[i] == old_delim) + path[i] = delim; + } +} + +static void setup_cifs_sb(struct smb_vol *pvolume_info, + struct cifs_sb_info *cifs_sb) +{ + if (pvolume_info->rsize > CIFSMaxBufSize) { + cERROR(1, "rsize %d too large, using MaxBufSize", + pvolume_info->rsize); + cifs_sb->rsize = CIFSMaxBufSize; + } else if ((pvolume_info->rsize) && + (pvolume_info->rsize <= CIFSMaxBufSize)) + cifs_sb->rsize = pvolume_info->rsize; + else /* default */ + cifs_sb->rsize = CIFSMaxBufSize; + + if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) { + cERROR(1, "wsize %d too large, using 4096 instead", + pvolume_info->wsize); + cifs_sb->wsize = 4096; + } else if (pvolume_info->wsize) + cifs_sb->wsize = pvolume_info->wsize; + else + cifs_sb->wsize = min_t(const int, + PAGEVEC_SIZE * PAGE_CACHE_SIZE, + 127*1024); + /* old default of CIFSMaxBufSize was too small now + that SMB Write2 can send multiple pages in kvec. + RFC1001 does not describe what happens when frame + bigger than 128K is sent so use that as max in + conjunction with 52K kvec constraint on arch with 4K + page size */ + + if (cifs_sb->rsize < 2048) { + cifs_sb->rsize = 2048; + /* Windows ME may prefer this */ + cFYI(1, "readsize set to minimum: 2048"); + } + /* calculate prepath */ + cifs_sb->prepath = pvolume_info->prepath; + if (cifs_sb->prepath) { + cifs_sb->prepathlen = strlen(cifs_sb->prepath); + /* we can not convert the / to \ in the path + separators in the prefixpath yet because we do not + know (until reset_cifs_unix_caps is called later) + whether POSIX PATH CAP is available. We normalize + the / to \ after reset_cifs_unix_caps is called */ + pvolume_info->prepath = NULL; + } else + cifs_sb->prepathlen = 0; + cifs_sb->mnt_uid = pvolume_info->linux_uid; + cifs_sb->mnt_gid = pvolume_info->linux_gid; + cifs_sb->mnt_file_mode = pvolume_info->file_mode; + cifs_sb->mnt_dir_mode = pvolume_info->dir_mode; + cFYI(1, "file mode: 0x%x dir mode: 0x%x", + cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode); + + 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->cifs_acl) + cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL; + 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->direct_io) { + cFYI(1, "mounting share using direct i/o"); + cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO; + } + + if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm)) + cERROR(1, "mount option dynperm ignored if cifsacl " + "mount option supported"); +} + +static int +is_path_accessible(int xid, struct cifsTconInfo *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); + kfree(pfile_info); + return rc; +} + +static void +cleanup_volume_info(struct smb_vol **pvolume_info) +{ + struct smb_vol *volume_info; + + if (!pvolume_info || !*pvolume_info) + return; + + volume_info = *pvolume_info; + kzfree(volume_info->password); + kfree(volume_info->UNC); + kfree(volume_info->prepath); + kfree(volume_info); + *pvolume_info = NULL; + return; +} + +#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 *volume_info, + const struct cifs_sb_info *cifs_sb) +{ + char *full_path; + + int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1); + full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL); + if (full_path == NULL) + return ERR_PTR(-ENOMEM); + + strncpy(full_path, volume_info->UNC, unc_len); + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) { + int i; + for (i = 0; i < unc_len; i++) { + if (full_path[i] == '\\') + full_path[i] = '/'; + } + } + + if (cifs_sb->prepathlen) + strncpy(full_path + unc_len, cifs_sb->prepath, + cifs_sb->prepathlen); + + full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */ + return full_path; +} +#endif + +int +cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, + char *mount_data_global, const char *devname) +{ + int rc; + int xid; + struct smb_vol *volume_info; + struct cifsSesInfo *pSesInfo; + struct cifsTconInfo *tcon; + struct TCP_Server_Info *srvTcp; + char *full_path; + char *mount_data = mount_data_global; +#ifdef CONFIG_CIFS_DFS_UPCALL + struct dfs_info3_param *referrals = NULL; + unsigned int num_referrals = 0; + int referral_walks_count = 0; +try_mount_again: +#endif + rc = 0; + tcon = NULL; + pSesInfo = NULL; + srvTcp = NULL; + full_path = NULL; + + xid = GetXid(); + + volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL); + if (!volume_info) { + rc = -ENOMEM; + goto out; + } + + if (cifs_parse_mount_options(mount_data, devname, volume_info)) { + rc = -EINVAL; + goto out; + } + + if (volume_info->nullauth) { + cFYI(1, "null user"); + volume_info->username = ""; + } 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 */ + rc = -EINVAL; + goto out; + } + + /* 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); + rc = -ELIBACC; + goto out; + } + } + cifs_sb->local_nls = volume_info->local_nls; + + /* get a reference to a tcp session */ + srvTcp = cifs_get_tcp_session(volume_info); + if (IS_ERR(srvTcp)) { + rc = PTR_ERR(srvTcp); + 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; + } + + setup_cifs_sb(volume_info, cifs_sb); + if (pSesInfo->capabilities & CAP_LARGE_FILES) + sb->s_maxbytes = MAX_LFS_FILESIZE; + else + sb->s_maxbytes = MAX_NON_LFS; + + /* BB FIXME fix time_gran to be larger for LANMAN sessions */ + sb->s_time_gran = 100; + + /* 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; + } + + cifs_sb->tcon = tcon; + + /* do not care if following two calls succeed - informational */ + if (!tcon->ipc) { + CIFSSMBQFSDeviceInfo(xid, tcon); + CIFSSMBQFSAttributeInfo(xid, tcon); + } + + /* 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, sb, volume_info); + else + tcon->unix_ext = 0; /* server does not support them */ + + /* convert forward to back slashes in prepath here if needed */ + if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0) + convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb)); + + if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) { + cifs_sb->rsize = 1024 * 127; + cFYI(DBG2, "no very large read support, rsize now 127K"); + } + if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X)) + cifs_sb->wsize = min(cifs_sb->wsize, + (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE)); + if (!(tcon->ses->capabilities & CAP_LARGE_READ_X)) + cifs_sb->rsize = min(cifs_sb->rsize, + (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE)); + +remote_path_check: + /* check if a whole path (including prepath) is not remote */ + if (!rc && cifs_sb->prepathlen && tcon) { + /* build_path_to_root works only when we have a valid tcon */ + full_path = cifs_build_path_to_root(cifs_sb); + if (full_path == NULL) { + rc = -ENOMEM; + goto mount_fail_check; + } + rc = is_path_accessible(xid, tcon, cifs_sb, full_path); + if (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; + } + /* convert forward to back slashes in prepath here if needed */ + if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0) + convert_delimiter(cifs_sb->prepath, + CIFS_DIR_SEP(cifs_sb)); + full_path = build_unc_path_to_root(volume_info, cifs_sb); + if (IS_ERR(full_path)) { + rc = PTR_ERR(full_path); + goto mount_fail_check; + } + + cFYI(1, "Getting referral for: %s", full_path); + rc = get_dfs_path(xid, pSesInfo , full_path + 1, + 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; + + if (mount_data != mount_data_global) + kfree(mount_data); + + mount_data = cifs_compose_mount_options( + cifs_sb->mountdata, full_path + 1, + referrals, &fake_devname); + + free_dfs_info_array(referrals, num_referrals); + kfree(fake_devname); + kfree(full_path); + + if (IS_ERR(mount_data)) { + rc = PTR_ERR(mount_data); + mount_data = NULL; + goto mount_fail_check; + } + + if (tcon) + cifs_put_tcon(tcon); + else if (pSesInfo) + cifs_put_smb_ses(pSesInfo); + + cleanup_volume_info(&volume_info); + referral_walks_count++; + FreeXid(xid); + goto try_mount_again; + } +#else /* No DFS support, return error on mount */ + rc = -EOPNOTSUPP; +#endif + } + +mount_fail_check: + /* on error free sesinfo and tcon struct if needed */ + if (rc) { + if (mount_data != mount_data_global) + kfree(mount_data); + /* If find_unc succeeded then rc == 0 so we can not end */ + /* up accidently 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); + goto out; + } + + /* volume_info->password is freed above when existing session found + (in which case it is not needed anymore) but when new sesion is created + the password ptr is put in the new session structure (in which case the + password will be freed at unmount time) */ +out: + /* zero out password before freeing */ + cleanup_volume_info(&volume_info); + FreeXid(xid); + return rc; +} + +int +CIFSTCon(unsigned int xid, struct cifsSesInfo *ses, + const char *tree, struct cifsTconInfo *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, bytes_left; + __u16 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 ((ses->server->secMode) & 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_SESS_KEY_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->secMode & + SECMODE_PW_ENCRYPT ? true : false, + bcc_ptr); + else +#endif /* CIFS_WEAK_PW_HASH */ + SMBNTencrypt(tcon->password, ses->server->cryptKey, + bcc_ptr); + + bcc_ptr += CIFS_SESS_KEY_SIZE; + if (ses->capabilities & CAP_UNICODE) { + /* must align unicode strings */ + *bcc_ptr = 0; /* null byte password */ + bcc_ptr++; + } + } + + if (ses->server->secMode & + (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_strtoUCS((__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 += count; + pSMB->ByteCount = cpu_to_le16(count); + + rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length, + CIFS_STD_OP); + + /* 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 = 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_ucs(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; +} + +int +cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb) +{ + int rc = 0; + char *tmp; + + if (cifs_sb->tcon) + cifs_put_tcon(cifs_sb->tcon); + + cifs_sb->tcon = NULL; + tmp = cifs_sb->prepath; + cifs_sb->prepathlen = 0; + cifs_sb->prepath = NULL; + kfree(tmp); + + return rc; +} + +int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *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 != CifsExiting) + server->tcpStatus = CifsGood; + else + rc = -EHOSTDOWN; + spin_unlock(&GlobalMid_Lock); + + } + + return rc; +} + + +int cifs_setup_session(unsigned int xid, struct cifsSesInfo *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->secMode, server->capabilities, server->timeAdj); + + rc = CIFS_SessSetup(xid, ses, nls_info); + if (rc) { + cERROR(1, "Send error in SessSetup = %d", rc); + } else { + cFYI(1, "CIFS Session Established successfully"); + spin_lock(&GlobalMid_Lock); + ses->status = CifsGood; + ses->need_reconnect = false; + spin_unlock(&GlobalMid_Lock); + } + + return rc; +} + |