| /* |
| * fs/cifs/connect.c |
| * |
| * Copyright (C) International Business Machines Corp., 2002,2011 |
| * 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/sched/mm.h> |
| #include <linux/sched/signal.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 <linux/uuid.h> |
| #include <linux/uaccess.h> |
| #include <asm/processor.h> |
| #include <linux/inet.h> |
| #include <linux/module.h> |
| #include <keys/user-type.h> |
| #include <net/ipv6.h> |
| #include <linux/parser.h> |
| #include <linux/bvec.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" |
| #include "smb2proto.h" |
| #include "smbdirect.h" |
| #include "dns_resolve.h" |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| #include "dfs_cache.h" |
| #endif |
| #include "fs_context.h" |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| #include "cifs_swn.h" |
| #endif |
| |
| extern mempool_t *cifs_req_poolp; |
| extern bool disable_legacy_dialects; |
| |
| /* FIXME: should these be tunable? */ |
| #define TLINK_ERROR_EXPIRE (1 * HZ) |
| #define TLINK_IDLE_EXPIRE (600 * HZ) |
| |
| /* Drop the connection to not overload the server */ |
| #define NUM_STATUS_IO_TIMEOUT 5 |
| |
| 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); |
| |
| /* |
| * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may |
| * get their ip addresses changed at some point. |
| * |
| * This should be called with server->srv_mutex held. |
| */ |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server) |
| { |
| int rc; |
| int len; |
| char *unc, *ipaddr = NULL; |
| |
| if (!server->hostname) |
| return -EINVAL; |
| |
| len = strlen(server->hostname) + 3; |
| |
| unc = kmalloc(len, GFP_KERNEL); |
| if (!unc) { |
| cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__); |
| return -ENOMEM; |
| } |
| scnprintf(unc, len, "\\\\%s", server->hostname); |
| |
| rc = dns_resolve_server_name_to_ip(unc, &ipaddr); |
| kfree(unc); |
| |
| if (rc < 0) { |
| cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n", |
| __func__, server->hostname, rc); |
| return rc; |
| } |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr, |
| strlen(ipaddr)); |
| spin_unlock(&cifs_tcp_ses_lock); |
| kfree(ipaddr); |
| |
| return !rc ? -1 : 0; |
| } |
| |
| /* These functions must be called with server->srv_mutex held */ |
| static void reconn_set_next_dfs_target(struct TCP_Server_Info *server, |
| struct cifs_sb_info *cifs_sb, |
| struct dfs_cache_tgt_list *tgt_list, |
| struct dfs_cache_tgt_iterator **tgt_it) |
| { |
| const char *name; |
| int rc; |
| |
| if (!cifs_sb || !cifs_sb->origin_fullpath) |
| return; |
| |
| if (!*tgt_it) { |
| *tgt_it = dfs_cache_get_tgt_iterator(tgt_list); |
| } else { |
| *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it); |
| if (!*tgt_it) |
| *tgt_it = dfs_cache_get_tgt_iterator(tgt_list); |
| } |
| |
| cifs_dbg(FYI, "%s: UNC: %s\n", __func__, cifs_sb->origin_fullpath); |
| |
| name = dfs_cache_get_tgt_name(*tgt_it); |
| |
| kfree(server->hostname); |
| |
| server->hostname = extract_hostname(name); |
| if (IS_ERR(server->hostname)) { |
| cifs_dbg(FYI, |
| "%s: failed to extract hostname from target: %ld\n", |
| __func__, PTR_ERR(server->hostname)); |
| return; |
| } |
| |
| rc = reconn_set_ipaddr_from_hostname(server); |
| if (rc) { |
| cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n", |
| __func__, rc); |
| } |
| } |
| |
| static inline int reconn_setup_dfs_targets(struct cifs_sb_info *cifs_sb, |
| struct dfs_cache_tgt_list *tl) |
| { |
| if (!cifs_sb->origin_fullpath) |
| return -EOPNOTSUPP; |
| return dfs_cache_noreq_find(cifs_sb->origin_fullpath + 1, NULL, tl); |
| } |
| #endif |
| |
| /* |
| * 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) |
| */ |
| 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; |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| struct super_block *sb = NULL; |
| struct cifs_sb_info *cifs_sb = NULL; |
| struct dfs_cache_tgt_list tgt_list = {0}; |
| struct dfs_cache_tgt_iterator *tgt_it = NULL; |
| #endif |
| |
| spin_lock(&GlobalMid_Lock); |
| server->nr_targets = 1; |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| spin_unlock(&GlobalMid_Lock); |
| sb = cifs_get_tcp_super(server); |
| if (IS_ERR(sb)) { |
| rc = PTR_ERR(sb); |
| cifs_dbg(FYI, "%s: will not do DFS failover: rc = %d\n", |
| __func__, rc); |
| sb = NULL; |
| } else { |
| cifs_sb = CIFS_SB(sb); |
| rc = reconn_setup_dfs_targets(cifs_sb, &tgt_list); |
| if (rc) { |
| cifs_sb = NULL; |
| if (rc != -EOPNOTSUPP) { |
| cifs_server_dbg(VFS, "%s: no target servers for DFS failover\n", |
| __func__); |
| } |
| } else { |
| server->nr_targets = dfs_cache_get_nr_tgts(&tgt_list); |
| } |
| } |
| cifs_dbg(FYI, "%s: will retry %d target(s)\n", __func__, |
| server->nr_targets); |
| spin_lock(&GlobalMid_Lock); |
| #endif |
| if (server->tcpStatus == CifsExiting) { |
| /* the demux thread will exit normally |
| next time through the loop */ |
| spin_unlock(&GlobalMid_Lock); |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| dfs_cache_free_tgts(&tgt_list); |
| cifs_put_tcp_super(sb); |
| #endif |
| wake_up(&server->response_q); |
| return rc; |
| } else |
| server->tcpStatus = CifsNeedReconnect; |
| spin_unlock(&GlobalMid_Lock); |
| server->maxBuf = 0; |
| server->max_read = 0; |
| |
| cifs_dbg(FYI, "Mark tcp session as need reconnect\n"); |
| trace_smb3_reconnect(server->CurrentMid, server->hostname); |
| |
| /* before reconnecting the tcp session, mark the smb session (uid) |
| and the tid bad so they are not used until reconnected */ |
| cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n", |
| __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; |
| list_for_each(tmp2, &ses->tcon_list) { |
| tcon = list_entry(tmp2, struct cifs_tcon, tcon_list); |
| tcon->need_reconnect = true; |
| } |
| if (ses->tcon_ipc) |
| ses->tcon_ipc->need_reconnect = true; |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| /* do not want to be sending data on a socket we are freeing */ |
| cifs_dbg(FYI, "%s: tearing down socket\n", __func__); |
| mutex_lock(&server->srv_mutex); |
| if (server->ssocket) { |
| cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", |
| server->ssocket->state, server->ssocket->flags); |
| kernel_sock_shutdown(server->ssocket, SHUT_WR); |
| cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", |
| 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; |
| |
| /* mark submitted MIDs for retry and issue callback */ |
| INIT_LIST_HEAD(&retry_list); |
| cifs_dbg(FYI, "%s: moving mids to private list\n", __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); |
| kref_get(&mid_entry->refcount); |
| if (mid_entry->mid_state == MID_REQUEST_SUBMITTED) |
| mid_entry->mid_state = MID_RETRY_NEEDED; |
| list_move(&mid_entry->qhead, &retry_list); |
| mid_entry->mid_flags |= MID_DELETED; |
| } |
| spin_unlock(&GlobalMid_Lock); |
| mutex_unlock(&server->srv_mutex); |
| |
| cifs_dbg(FYI, "%s: issuing mid callbacks\n", __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); |
| cifs_mid_q_entry_release(mid_entry); |
| } |
| |
| if (cifs_rdma_enabled(server)) { |
| mutex_lock(&server->srv_mutex); |
| smbd_destroy(server); |
| mutex_unlock(&server->srv_mutex); |
| } |
| |
| do { |
| try_to_freeze(); |
| |
| mutex_lock(&server->srv_mutex); |
| |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| if (server->use_swn_dstaddr) { |
| server->dstaddr = server->swn_dstaddr; |
| } else { |
| #endif |
| |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| /* |
| * Set up next DFS target server (if any) for reconnect. If DFS |
| * feature is disabled, then we will retry last server we |
| * connected to before. |
| */ |
| reconn_set_next_dfs_target(server, cifs_sb, &tgt_list, &tgt_it); |
| #endif |
| |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| } |
| #endif |
| |
| if (cifs_rdma_enabled(server)) |
| rc = smbd_reconnect(server); |
| else |
| rc = generic_ip_connect(server); |
| if (rc) { |
| cifs_dbg(FYI, "reconnect error %d\n", rc); |
| mutex_unlock(&server->srv_mutex); |
| msleep(3000); |
| } else { |
| atomic_inc(&tcpSesReconnectCount); |
| set_credits(server, 1); |
| spin_lock(&GlobalMid_Lock); |
| if (server->tcpStatus != CifsExiting) |
| server->tcpStatus = CifsNeedNegotiate; |
| spin_unlock(&GlobalMid_Lock); |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| server->use_swn_dstaddr = false; |
| #endif |
| mutex_unlock(&server->srv_mutex); |
| } |
| } while (server->tcpStatus == CifsNeedReconnect); |
| |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| if (tgt_it) { |
| rc = dfs_cache_noreq_update_tgthint(cifs_sb->origin_fullpath + 1, |
| tgt_it); |
| if (rc) { |
| cifs_server_dbg(VFS, "%s: failed to update DFS target hint: rc = %d\n", |
| __func__, rc); |
| } |
| rc = dfs_cache_update_vol(cifs_sb->origin_fullpath, server); |
| if (rc) { |
| cifs_server_dbg(VFS, "%s: failed to update vol info in DFS cache: rc = %d\n", |
| __func__, rc); |
| } |
| dfs_cache_free_tgts(&tgt_list); |
| |
| } |
| |
| cifs_put_tcp_super(sb); |
| #endif |
| if (server->tcpStatus == CifsNeedNegotiate) |
| mod_delayed_work(cifsiod_wq, &server->echo, 0); |
| |
| wake_up(&server->response_q); |
| return rc; |
| } |
| |
| 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); |
| unsigned long echo_interval; |
| |
| /* |
| * If we need to renegotiate, set echo interval to zero to |
| * immediately call echo service where we can renegotiate. |
| */ |
| if (server->tcpStatus == CifsNeedNegotiate) |
| echo_interval = 0; |
| else |
| echo_interval = server->echo_interval; |
| |
| /* |
| * We cannot send an echo if it is disabled. |
| * Also, no need to ping if we got a response recently. |
| */ |
| |
| if (server->tcpStatus == CifsNeedReconnect || |
| server->tcpStatus == CifsExiting || |
| server->tcpStatus == CifsNew || |
| (server->ops->can_echo && !server->ops->can_echo(server)) || |
| time_before(jiffies, server->lstrp + echo_interval - HZ)) |
| goto requeue_echo; |
| |
| rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS; |
| if (rc) |
| cifs_dbg(FYI, "Unable to send echo request to server: %s\n", |
| server->hostname); |
| |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| /* Check witness registrations */ |
| cifs_swn_check(); |
| #endif |
| |
| requeue_echo: |
| queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval); |
| } |
| |
| static bool |
| allocate_buffers(struct TCP_Server_Info *server) |
| { |
| if (!server->bigbuf) { |
| server->bigbuf = (char *)cifs_buf_get(); |
| if (!server->bigbuf) { |
| cifs_server_dbg(VFS, "No memory for large SMB response\n"); |
| 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, HEADER_SIZE(server)); |
| } |
| |
| if (!server->smallbuf) { |
| server->smallbuf = (char *)cifs_small_buf_get(); |
| if (!server->smallbuf) { |
| cifs_server_dbg(VFS, "No memory for SMB response\n"); |
| 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, HEADER_SIZE(server)); |
| } |
| |
| return true; |
| } |
| |
| static bool |
| server_unresponsive(struct TCP_Server_Info *server) |
| { |
| /* |
| * We need to wait 3 echo intervals to make sure we handle such |
| * situations right: |
| * 1s client sends a normal SMB request |
| * 2s client gets a response |
| * 30s echo workqueue job pops, and decides we got a response recently |
| * and don't need to send another |
| * ... |
| * 65s kernel_recvmsg times out, and we see that we haven't gotten |
| * a response in >60s. |
| */ |
| if ((server->tcpStatus == CifsGood || |
| server->tcpStatus == CifsNeedNegotiate) && |
| time_after(jiffies, server->lstrp + 3 * server->echo_interval)) { |
| cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n", |
| (3 * server->echo_interval) / HZ); |
| cifs_reconnect(server); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static inline bool |
| zero_credits(struct TCP_Server_Info *server) |
| { |
| int val; |
| |
| spin_lock(&server->req_lock); |
| val = server->credits + server->echo_credits + server->oplock_credits; |
| if (server->in_flight == 0 && val == 0) { |
| spin_unlock(&server->req_lock); |
| return true; |
| } |
| spin_unlock(&server->req_lock); |
| return false; |
| } |
| |
| static int |
| cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg) |
| { |
| int length = 0; |
| int total_read; |
| |
| smb_msg->msg_control = NULL; |
| smb_msg->msg_controllen = 0; |
| |
| for (total_read = 0; msg_data_left(smb_msg); total_read += length) { |
| try_to_freeze(); |
| |
| /* reconnect if no credits and no requests in flight */ |
| if (zero_credits(server)) { |
| cifs_reconnect(server); |
| return -ECONNABORTED; |
| } |
| |
| if (server_unresponsive(server)) |
| return -ECONNABORTED; |
| if (cifs_rdma_enabled(server) && server->smbd_conn) |
| length = smbd_recv(server->smbd_conn, smb_msg); |
| else |
| length = sock_recvmsg(server->ssocket, smb_msg, 0); |
| |
| if (server->tcpStatus == CifsExiting) |
| return -ESHUTDOWN; |
| |
| if (server->tcpStatus == CifsNeedReconnect) { |
| cifs_reconnect(server); |
| return -ECONNABORTED; |
| } |
| |
| 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; |
| } |
| |
| if (length <= 0) { |
| cifs_dbg(FYI, "Received no data or error: %d\n", length); |
| cifs_reconnect(server); |
| return -ECONNABORTED; |
| } |
| } |
| return total_read; |
| } |
| |
| int |
| cifs_read_from_socket(struct TCP_Server_Info *server, char *buf, |
| unsigned int to_read) |
| { |
| struct msghdr smb_msg; |
| struct kvec iov = {.iov_base = buf, .iov_len = to_read}; |
| iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read); |
| |
| return cifs_readv_from_socket(server, &smb_msg); |
| } |
| |
| int |
| cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page, |
| unsigned int page_offset, unsigned int to_read) |
| { |
| struct msghdr smb_msg; |
| struct bio_vec bv = { |
| .bv_page = page, .bv_len = to_read, .bv_offset = page_offset}; |
| iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read); |
| return cifs_readv_from_socket(server, &smb_msg); |
| } |
| |
| 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: |
| cifs_dbg(FYI, "RFC 1002 session keep alive\n"); |
| break; |
| case RFC1002_POSITIVE_SESSION_RESPONSE: |
| cifs_dbg(FYI, "RFC 1002 positive session response\n"); |
| break; |
| case RFC1002_NEGATIVE_SESSION_RESPONSE: |
| /* |
| * We get this from Windows 98 instead of an error on |
| * SMB negprot response. |
| */ |
| cifs_dbg(FYI, "RFC 1002 negative session response\n"); |
| /* 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); |
| break; |
| default: |
| cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type); |
| cifs_reconnect(server); |
| } |
| |
| return false; |
| } |
| |
| 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->mid_state = MID_RESPONSE_RECEIVED; |
| else |
| mid->mid_state = MID_RESPONSE_MALFORMED; |
| /* |
| * Trying to handle/dequeue a mid after the send_recv() |
| * function has finished processing it is a bug. |
| */ |
| if (mid->mid_flags & MID_DELETED) |
| pr_warn_once("trying to dequeue a deleted mid\n"); |
| else { |
| list_del_init(&mid->qhead); |
| mid->mid_flags |= MID_DELETED; |
| } |
| spin_unlock(&GlobalMid_Lock); |
| } |
| |
| static unsigned int |
| smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server) |
| { |
| struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer; |
| |
| /* |
| * SMB1 does not use credits. |
| */ |
| if (server->vals->header_preamble_size) |
| return 0; |
| |
| return le16_to_cpu(shdr->CreditRequest); |
| } |
| |
| static void |
| handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server, |
| char *buf, int malformed) |
| { |
| if (server->ops->check_trans2 && |
| server->ops->check_trans2(mid, server, buf, malformed)) |
| return; |
| mid->credits_received = smb2_get_credits_from_hdr(buf, server); |
| mid->resp_buf = buf; |
| mid->large_buf = 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); |
| |
| cancel_delayed_work_sync(&server->echo); |
| |
| 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 */ |
| spin_lock(&server->req_lock); |
| if (server->credits <= 0) |
| server->credits = 1; |
| spin_unlock(&server->req_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 (cifs_rdma_enabled(server)) |
| smbd_destroy(server); |
| 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); |
| cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid); |
| kref_get(&mid_entry->refcount); |
| mid_entry->mid_state = MID_SHUTDOWN; |
| list_move(&mid_entry->qhead, &dispose_list); |
| mid_entry->mid_flags |= MID_DELETED; |
| } |
| 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); |
| cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid); |
| list_del_init(&mid_entry->qhead); |
| mid_entry->callback(mid_entry); |
| cifs_mid_q_entry_release(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. |
| */ |
| cifs_dbg(FYI, "Wait for exit from demultiplex thread\n"); |
| 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); |
| |
| length = atomic_dec_return(&tcpSesAllocCount); |
| if (length > 0) |
| mempool_resize(cifs_req_poolp, length + cifs_min_rcv); |
| } |
| |
| static int |
| standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) |
| { |
| int length; |
| char *buf = server->smallbuf; |
| unsigned int pdu_length = server->pdu_size; |
| |
| /* make sure this will fit in a large buffer */ |
| if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - |
| server->vals->header_preamble_size) { |
| cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length); |
| cifs_reconnect(server); |
| return -ECONNABORTED; |
| } |
| |
| /* 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, buf, server->total_read); |
| buf = server->bigbuf; |
| } |
| |
| /* now read the rest */ |
| length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, |
| pdu_length - HEADER_SIZE(server) + 1 |
| + server->vals->header_preamble_size); |
| |
| if (length < 0) |
| return length; |
| server->total_read += length; |
| |
| dump_smb(buf, server->total_read); |
| |
| return cifs_handle_standard(server, mid); |
| } |
| |
| int |
| cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid) |
| { |
| char *buf = server->large_buf ? server->bigbuf : server->smallbuf; |
| int length; |
| |
| /* |
| * 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 = server->ops->check_message(buf, server->total_read, server); |
| if (length != 0) |
| cifs_dump_mem("Bad SMB: ", buf, |
| min_t(unsigned int, server->total_read, 48)); |
| |
| if (server->ops->is_session_expired && |
| server->ops->is_session_expired(buf)) { |
| cifs_reconnect(server); |
| return -1; |
| } |
| |
| if (server->ops->is_status_pending && |
| server->ops->is_status_pending(buf, server)) |
| return -1; |
| |
| if (!mid) |
| return length; |
| |
| handle_mid(mid, server, buf, length); |
| return 0; |
| } |
| |
| static void |
| smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server) |
| { |
| struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer; |
| int scredits = server->credits; |
| |
| /* |
| * SMB1 does not use credits. |
| */ |
| if (server->vals->header_preamble_size) |
| return; |
| |
| if (shdr->CreditRequest) { |
| spin_lock(&server->req_lock); |
| server->credits += le16_to_cpu(shdr->CreditRequest); |
| spin_unlock(&server->req_lock); |
| wake_up(&server->request_q); |
| |
| trace_smb3_add_credits(server->CurrentMid, |
| server->hostname, scredits, |
| le16_to_cpu(shdr->CreditRequest)); |
| cifs_server_dbg(FYI, "%s: added %u credits total=%d\n", |
| __func__, le16_to_cpu(shdr->CreditRequest), |
| scredits); |
| } |
| } |
| |
| |
| static int |
| cifs_demultiplex_thread(void *p) |
| { |
| int i, num_mids, length; |
| struct TCP_Server_Info *server = p; |
| unsigned int pdu_length; |
| unsigned int next_offset; |
| char *buf = NULL; |
| struct task_struct *task_to_wake = NULL; |
| struct mid_q_entry *mids[MAX_COMPOUND]; |
| char *bufs[MAX_COMPOUND]; |
| unsigned int noreclaim_flag, num_io_timeout = 0; |
| |
| noreclaim_flag = memalloc_noreclaim_save(); |
| cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current)); |
| |
| length = atomic_inc_return(&tcpSesAllocCount); |
| if (length > 1) |
| mempool_resize(cifs_req_poolp, length + cifs_min_rcv); |
| |
| set_freezable(); |
| allow_kernel_signal(SIGKILL); |
| while (server->tcpStatus != CifsExiting) { |
| if (try_to_freeze()) |
| continue; |
| |
| if (!allocate_buffers(server)) |
| continue; |
| |
| server->large_buf = false; |
| buf = server->smallbuf; |
| pdu_length = 4; /* enough to get RFC1001 header */ |
| |
| length = cifs_read_from_socket(server, buf, pdu_length); |
| if (length < 0) |
| continue; |
| |
| if (server->vals->header_preamble_size == 0) |
| server->total_read = 0; |
| else |
| server->total_read = length; |
| |
| /* |
| * The right amount was read from socket - 4 bytes, |
| * so we can now interpret the length field. |
| */ |
| pdu_length = get_rfc1002_length(buf); |
| |
| cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length); |
| if (!is_smb_response(server, buf[0])) |
| continue; |
| next_pdu: |
| server->pdu_size = pdu_length; |
| |
| /* make sure we have enough to get to the MID */ |
| if (server->pdu_size < HEADER_SIZE(server) - 1 - |
| server->vals->header_preamble_size) { |
| cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n", |
| server->pdu_size); |
| cifs_reconnect(server); |
| continue; |
| } |
| |
| /* read down to the MID */ |
| length = cifs_read_from_socket(server, |
| buf + server->vals->header_preamble_size, |
| HEADER_SIZE(server) - 1 |
| - server->vals->header_preamble_size); |
| if (length < 0) |
| continue; |
| server->total_read += length; |
| |
| if (server->ops->next_header) { |
| next_offset = server->ops->next_header(buf); |
| if (next_offset) |
| server->pdu_size = next_offset; |
| } |
| |
| memset(mids, 0, sizeof(mids)); |
| memset(bufs, 0, sizeof(bufs)); |
| num_mids = 0; |
| |
| if (server->ops->is_transform_hdr && |
| server->ops->receive_transform && |
| server->ops->is_transform_hdr(buf)) { |
| length = server->ops->receive_transform(server, |
| mids, |
| bufs, |
| &num_mids); |
| } else { |
| mids[0] = server->ops->find_mid(server, buf); |
| bufs[0] = buf; |
| num_mids = 1; |
| |
| if (!mids[0] || !mids[0]->receive) |
| length = standard_receive3(server, mids[0]); |
| else |
| length = mids[0]->receive(server, mids[0]); |
| } |
| |
| if (length < 0) { |
| for (i = 0; i < num_mids; i++) |
| if (mids[i]) |
| cifs_mid_q_entry_release(mids[i]); |
| continue; |
| } |
| |
| if (server->ops->is_status_io_timeout && |
| server->ops->is_status_io_timeout(buf)) { |
| num_io_timeout++; |
| if (num_io_timeout > NUM_STATUS_IO_TIMEOUT) { |
| cifs_reconnect(server); |
| num_io_timeout = 0; |
| continue; |
| } |
| } |
| |
| server->lstrp = jiffies; |
| |
| for (i = 0; i < num_mids; i++) { |
| if (mids[i] != NULL) { |
| mids[i]->resp_buf_size = server->pdu_size; |
| |
| if (!mids[i]->multiRsp || mids[i]->multiEnd) |
| mids[i]->callback(mids[i]); |
| |
| cifs_mid_q_entry_release(mids[i]); |
| } else if (server->ops->is_oplock_break && |
| server->ops->is_oplock_break(bufs[i], |
| server)) { |
| smb2_add_credits_from_hdr(bufs[i], server); |
| cifs_dbg(FYI, "Received oplock break\n"); |
| } else { |
| cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n", |
| atomic_read(&midCount)); |
| cifs_dump_mem("Received Data is: ", bufs[i], |
| HEADER_SIZE(server)); |
| smb2_add_credits_from_hdr(bufs[i], server); |
| #ifdef CONFIG_CIFS_DEBUG2 |
| if (server->ops->dump_detail) |
| server->ops->dump_detail(bufs[i], |
| server); |
| cifs_dump_mids(server); |
| #endif /* CIFS_DEBUG2 */ |
| } |
| } |
| |
| if (pdu_length > server->pdu_size) { |
| if (!allocate_buffers(server)) |
| continue; |
| pdu_length -= server->pdu_size; |
| server->total_read = 0; |
| server->large_buf = false; |
| buf = server->smallbuf; |
| goto next_pdu; |
| } |
| } /* 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); |
| } |
| |
| memalloc_noreclaim_restore(noreclaim_flag); |
| module_put_and_exit(0); |
| } |
| |
| /** |
| * 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 |
| */ |
| bool |
| cifs_match_ipaddr(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; |
| |
| /* SMBDirect manages its own ports, don't match it here */ |
| if (server->rdma) |
| return true; |
| |
| 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 (!cifs_match_ipaddr(srcaddr, (struct sockaddr *)&server->srcaddr)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool |
| match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) |
| { |
| /* |
| * The select_sectype function should either return the ctx->sectype |
| * that was specified, or "Unspecified" if that sectype was not |
| * compatible with the given NEGOTIATE request. |
| */ |
| if (server->ops->select_sectype(server, ctx->sectype) |
| == Unspecified) |
| return false; |
| |
| /* |
| * Now check if signing mode is acceptable. No need to check |
| * global_secflags at this point since if MUST_SIGN is set then |
| * the server->sign had better be too. |
| */ |
| if (ctx->sign && !server->sign) |
| return false; |
| |
| return true; |
| } |
| |
| static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) |
| { |
| struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr; |
| |
| if (ctx->nosharesock) |
| return 0; |
| |
| /* If multidialect negotiation see if existing sessions match one */ |
| if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { |
| if (server->vals->protocol_id < SMB30_PROT_ID) |
| return 0; |
| } else if (strcmp(ctx->vals->version_string, |
| SMBDEFAULT_VERSION_STRING) == 0) { |
| if (server->vals->protocol_id < SMB21_PROT_ID) |
| return 0; |
| } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops)) |
| return 0; |
| |
| if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns)) |
| return 0; |
| |
| if (!match_address(server, addr, |
| (struct sockaddr *)&ctx->srcaddr)) |
| return 0; |
| |
| if (!match_port(server, addr)) |
| return 0; |
| |
| if (!match_security(server, ctx)) |
| return 0; |
| |
| if (server->echo_interval != ctx->echo_interval * HZ) |
| return 0; |
| |
| if (server->rdma != ctx->rdma) |
| return 0; |
| |
| if (server->ignore_signature != ctx->ignore_signature) |
| return 0; |
| |
| if (server->min_offload != ctx->min_offload) |
| return 0; |
| |
| return 1; |
| } |
| |
| struct TCP_Server_Info * |
| cifs_find_tcp_session(struct smb3_fs_context *ctx) |
| { |
| struct TCP_Server_Info *server; |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { |
| /* |
| * Skip ses channels since they're only handled in lower layers |
| * (e.g. cifs_send_recv). |
| */ |
| if (server->is_channel || !match_server(server, ctx)) |
| continue; |
| |
| ++server->srv_count; |
| spin_unlock(&cifs_tcp_ses_lock); |
| cifs_dbg(FYI, "Existing tcp session with server found\n"); |
| return server; |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| return NULL; |
| } |
| |
| void |
| cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect) |
| { |
| 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); |
| |
| if (from_reconnect) |
| /* |
| * Avoid deadlock here: reconnect work calls |
| * cifs_put_tcp_session() at its end. Need to be sure |
| * that reconnect work does nothing with server pointer after |
| * that step. |
| */ |
| cancel_delayed_work(&server->reconnect); |
| else |
| cancel_delayed_work_sync(&server->reconnect); |
| |
| spin_lock(&GlobalMid_Lock); |
| server->tcpStatus = CifsExiting; |
| spin_unlock(&GlobalMid_Lock); |
| |
| cifs_crypto_secmech_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) |
| send_sig(SIGKILL, task, 1); |
| } |
| |
| struct TCP_Server_Info * |
| cifs_get_tcp_session(struct smb3_fs_context *ctx) |
| { |
| struct TCP_Server_Info *tcp_ses = NULL; |
| int rc; |
| |
| cifs_dbg(FYI, "UNC: %s\n", ctx->UNC); |
| |
| /* see if we already have a matching tcp_ses */ |
| tcp_ses = cifs_find_tcp_session(ctx); |
| 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->ops = ctx->ops; |
| tcp_ses->vals = ctx->vals; |
| cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns)); |
| tcp_ses->hostname = extract_hostname(ctx->UNC); |
| if (IS_ERR(tcp_ses->hostname)) { |
| rc = PTR_ERR(tcp_ses->hostname); |
| goto out_err_crypto_release; |
| } |
| |
| tcp_ses->noblockcnt = ctx->rootfs; |
| tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs; |
| tcp_ses->noautotune = ctx->noautotune; |
| tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay; |
| tcp_ses->rdma = ctx->rdma; |
| tcp_ses->in_flight = 0; |
| tcp_ses->max_in_flight = 0; |
| tcp_ses->credits = 1; |
| 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, |
| ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); |
| memcpy(tcp_ses->server_RFC1001_name, |
| ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); |
| tcp_ses->session_estab = false; |
| tcp_ses->sequence_number = 0; |
| tcp_ses->reconnect_instance = 1; |
| tcp_ses->lstrp = jiffies; |
| tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression); |
| spin_lock_init(&tcp_ses->req_lock); |
| 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); |
| INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server); |
| mutex_init(&tcp_ses->reconnect_mutex); |
| memcpy(&tcp_ses->srcaddr, &ctx->srcaddr, |
| sizeof(tcp_ses->srcaddr)); |
| memcpy(&tcp_ses->dstaddr, &ctx->dstaddr, |
| sizeof(tcp_ses->dstaddr)); |
| if (ctx->use_client_guid) |
| memcpy(tcp_ses->client_guid, ctx->client_guid, |
| SMB2_CLIENT_GUID_SIZE); |
| else |
| generate_random_uuid(tcp_ses->client_guid); |
| /* |
| * 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 (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN && |
| ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX) |
| tcp_ses->echo_interval = ctx->echo_interval * HZ; |
| else |
| tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ; |
| if (tcp_ses->rdma) { |
| #ifndef CONFIG_CIFS_SMB_DIRECT |
| cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n"); |
| rc = -ENOENT; |
| goto out_err_crypto_release; |
| #endif |
| tcp_ses->smbd_conn = smbd_get_connection( |
| tcp_ses, (struct sockaddr *)&ctx->dstaddr); |
| if (tcp_ses->smbd_conn) { |
| cifs_dbg(VFS, "RDMA transport established\n"); |
| rc = 0; |
| goto smbd_connected; |
| } else { |
| rc = -ENOENT; |
| goto out_err_crypto_release; |
| } |
| } |
| rc = ip_connect(tcp_ses); |
| if (rc < 0) { |
| cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n"); |
| goto out_err_crypto_release; |
| } |
| smbd_connected: |
| /* |
| * 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); |
| cifs_dbg(VFS, "error %d create cifsd thread\n", rc); |
| module_put(THIS_MODULE); |
| goto out_err_crypto_release; |
| } |
| tcp_ses->min_offload = ctx->min_offload; |
| tcp_ses->tcpStatus = CifsNeedNegotiate; |
| |
| tcp_ses->nr_targets = 1; |
| tcp_ses->ignore_signature = ctx->ignore_signature; |
| /* 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(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval); |
| |
| return tcp_ses; |
| |
| out_err_crypto_release: |
| cifs_crypto_secmech_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 smb3_fs_context *ctx) |
| { |
| if (ctx->sectype != Unspecified && |
| ctx->sectype != ses->sectype) |
| return 0; |
| |
| /* |
| * If an existing session is limited to less channels than |
| * requested, it should not be reused |
| */ |
| if (ses->chan_max < ctx->max_channels) |
| return 0; |
| |
| switch (ses->sectype) { |
| case Kerberos: |
| if (!uid_eq(ctx->cred_uid, ses->cred_uid)) |
| return 0; |
| break; |
| default: |
| /* NULL username means anonymous session */ |
| if (ses->user_name == NULL) { |
| if (!ctx->nullauth) |
| return 0; |
| break; |
| } |
| |
| /* anything else takes username/password */ |
| if (strncmp(ses->user_name, |
| ctx->username ? ctx->username : "", |
| CIFS_MAX_USERNAME_LEN)) |
| return 0; |
| if ((ctx->username && strlen(ctx->username) != 0) && |
| ses->password != NULL && |
| strncmp(ses->password, |
| ctx->password ? ctx->password : "", |
| CIFS_MAX_PASSWORD_LEN)) |
| return 0; |
| } |
| return 1; |
| } |
| |
| /** |
| * cifs_setup_ipc - helper to setup the IPC tcon for the session |
| * |
| * A new IPC connection is made and stored in the session |
| * tcon_ipc. The IPC tcon has the same lifetime as the session. |
| */ |
| static int |
| cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx) |
| { |
| int rc = 0, xid; |
| struct cifs_tcon *tcon; |
| char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0}; |
| bool seal = false; |
| struct TCP_Server_Info *server = ses->server; |
| |
| /* |
| * If the mount request that resulted in the creation of the |
| * session requires encryption, force IPC to be encrypted too. |
| */ |
| if (ctx->seal) { |
| if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) |
| seal = true; |
| else { |
| cifs_server_dbg(VFS, |
| "IPC: server doesn't support encryption\n"); |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| tcon = tconInfoAlloc(); |
| if (tcon == NULL) |
| return -ENOMEM; |
| |
| scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname); |
| |
| xid = get_xid(); |
| tcon->ses = ses; |
| tcon->ipc = true; |
| tcon->seal = seal; |
| rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls); |
| free_xid(xid); |
| |
| if (rc) { |
| cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc); |
| tconInfoFree(tcon); |
| goto out; |
| } |
| |
| cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid); |
| |
| ses->tcon_ipc = tcon; |
| out: |
| return rc; |
| } |
| |
| /** |
| * cifs_free_ipc - helper to release the session IPC tcon |
| * |
| * Needs to be called everytime a session is destroyed |
| */ |
| static int |
| cifs_free_ipc(struct cifs_ses *ses) |
| { |
| int rc = 0, xid; |
| struct cifs_tcon *tcon = ses->tcon_ipc; |
| |
| if (tcon == NULL) |
| return 0; |
| |
| if (ses->server->ops->tree_disconnect) { |
| xid = get_xid(); |
| rc = ses->server->ops->tree_disconnect(xid, tcon); |
| free_xid(xid); |
| } |
| |
| if (rc) |
| cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc); |
| |
| tconInfoFree(tcon); |
| ses->tcon_ipc = NULL; |
| return rc; |
| } |
| |
| static struct cifs_ses * |
| cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) |
| { |
| struct cifs_ses *ses; |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { |
| if (ses->status == CifsExiting) |
| continue; |
| if (!match_session(ses, ctx)) |
| continue; |
| ++ses->ses_count; |
| spin_unlock(&cifs_tcp_ses_lock); |
| return ses; |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| return NULL; |
| } |
| |
| void cifs_put_smb_ses(struct cifs_ses *ses) |
| { |
| unsigned int rc, xid; |
| struct TCP_Server_Info *server = ses->server; |
| |
| cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count); |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| if (ses->status == CifsExiting) { |
| spin_unlock(&cifs_tcp_ses_lock); |
| return; |
| } |
| if (--ses->ses_count > 0) { |
| spin_unlock(&cifs_tcp_ses_lock); |
| return; |
| } |
| if (ses->status == CifsGood) |
| ses->status = CifsExiting; |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| cifs_free_ipc(ses); |
| |
| if (ses->status == CifsExiting && server->ops->logoff) { |
| xid = get_xid(); |
| rc = server->ops->logoff(xid, ses); |
| if (rc) |
| cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n", |
| __func__, rc); |
| _free_xid(xid); |
| } |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| list_del_init(&ses->smb_ses_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| /* close any extra channels */ |
| if (ses->chan_count > 1) { |
| int i; |
| |
| for (i = 1; i < ses->chan_count; i++) |
| cifs_put_tcp_session(ses->chans[i].server, 0); |
| } |
| |
| sesInfoFree(ses); |
| cifs_put_tcp_session(server, 0); |
| } |
| |
| #ifdef CONFIG_KEYS |
| |
| /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */ |
| #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1) |
| |
| /* Populate username and pw fields from keyring if possible */ |
| static int |
| cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses) |
| { |
| int rc = 0; |
| int is_domain = 0; |
| const char *delim, *payload; |
| char *desc; |
| ssize_t len; |
| struct key *key; |
| struct TCP_Server_Info *server = ses->server; |
| struct sockaddr_in *sa; |
| struct sockaddr_in6 *sa6; |
| const 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: |
| cifs_dbg(FYI, "Bad ss_family (%hu)\n", |
| server->dstaddr.ss_family); |
| rc = -EINVAL; |
| goto out_err; |
| } |
| |
| cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc); |
| key = request_key(&key_type_logon, desc, ""); |
| if (IS_ERR(key)) { |
| if (!ses->domainName) { |
| cifs_dbg(FYI, "domainName is NULL\n"); |
| rc = PTR_ERR(key); |
| goto out_err; |
| } |
| |
| /* didn't work, try to find a domain key */ |
| sprintf(desc, "cifs:d:%s", ses->domainName); |
| cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc); |
| key = request_key(&key_type_logon, desc, ""); |
| if (IS_ERR(key)) { |
| rc = PTR_ERR(key); |
| goto out_err; |
| } |
| is_domain = 1; |
| } |
| |
| down_read(&key->sem); |
| upayload = user_key_payload_locked(key); |
| if (IS_ERR_OR_NULL(upayload)) { |
| rc = upayload ? PTR_ERR(upayload) : -EINVAL; |
| goto out_key_put; |
| } |
| |
| /* find first : in payload */ |
| payload = upayload->data; |
| delim = strnchr(payload, upayload->datalen, ':'); |
| cifs_dbg(FYI, "payload=%s\n", payload); |
| if (!delim) { |
| cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n", |
| upayload->datalen); |
| rc = -EINVAL; |
| goto out_key_put; |
| } |
| |
| len = delim - payload; |
| if (len > CIFS_MAX_USERNAME_LEN || len <= 0) { |
| cifs_dbg(FYI, "Bad value from username search (len=%zd)\n", |
| len); |
| rc = -EINVAL; |
| goto out_key_put; |
| } |
| |
| ctx->username = kstrndup(payload, len, GFP_KERNEL); |
| if (!ctx->username) { |
| cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n", |
| len); |
| rc = -ENOMEM; |
| goto out_key_put; |
| } |
| cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username); |
| |
| len = key->datalen - (len + 1); |
| if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) { |
| cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len); |
| rc = -EINVAL; |
| kfree(ctx->username); |
| ctx->username = NULL; |
| goto out_key_put; |
| } |
| |
| ++delim; |
| ctx->password = kstrndup(delim, len, GFP_KERNEL); |
| if (!ctx->password) { |
| cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n", |
| len); |
| rc = -ENOMEM; |
| kfree(ctx->username); |
| ctx->username = NULL; |
| goto out_key_put; |
| } |
| |
| /* |
| * If we have a domain key then we must set the domainName in the |
| * for the request. |
| */ |
| if (is_domain && ses->domainName) { |
| ctx->domainname = kstrndup(ses->domainName, |
| strlen(ses->domainName), |
| GFP_KERNEL); |
| if (!ctx->domainname) { |
| cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n", |
| len); |
| rc = -ENOMEM; |
| kfree(ctx->username); |
| ctx->username = NULL; |
| kfree_sensitive(ctx->password); |
| ctx->password = NULL; |
| goto out_key_put; |
| } |
| } |
| |
| out_key_put: |
| up_read(&key->sem); |
| key_put(key); |
| out_err: |
| kfree(desc); |
| cifs_dbg(FYI, "%s: returning %d\n", __func__, rc); |
| return rc; |
| } |
| #else /* ! CONFIG_KEYS */ |
| static inline int |
| cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)), |
| struct cifs_ses *ses __attribute__((unused))) |
| { |
| return -ENOSYS; |
| } |
| #endif /* CONFIG_KEYS */ |
| |
| /** |
| * cifs_get_smb_ses - get a session matching @ctx data from @server |
| * |
| * This function assumes it is being called from cifs_mount() where we |
| * already got a server reference (server refcount +1). See |
| * cifs_get_tcon() for refcount explanations. |
| */ |
| struct cifs_ses * |
| cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) |
| { |
| int rc = -ENOMEM; |
| unsigned int xid; |
| struct cifs_ses *ses; |
| struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr; |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr; |
| |
| xid = get_xid(); |
| |
| ses = cifs_find_smb_ses(server, ctx); |
| if (ses) { |
| cifs_dbg(FYI, "Existing smb sess found (status=%d)\n", |
| 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); |
| free_xid(xid); |
| return ERR_PTR(rc); |
| } |
| if (ses->need_reconnect) { |
| cifs_dbg(FYI, "Session needs reconnect\n"); |
| rc = cifs_setup_session(xid, ses, |
| ctx->local_nls); |
| if (rc) { |
| mutex_unlock(&ses->session_mutex); |
| /* problem -- put our reference */ |
| cifs_put_smb_ses(ses); |
| free_xid(xid); |
| return ERR_PTR(rc); |
| } |
| } |
| mutex_unlock(&ses->session_mutex); |
| |
| /* existing SMB ses has a server reference already */ |
| cifs_put_tcp_session(server, 0); |
| free_xid(xid); |
| return ses; |
| } |
| |
| cifs_dbg(FYI, "Existing smb sess not found\n"); |
| 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 (ctx->username) { |
| ses->user_name = kstrdup(ctx->username, GFP_KERNEL); |
| if (!ses->user_name) |
| goto get_ses_fail; |
| } |
| |
| /* ctx->password freed at unmount */ |
| if (ctx->password) { |
| ses->password = kstrdup(ctx->password, GFP_KERNEL); |
| if (!ses->password) |
| goto get_ses_fail; |
| } |
| if (ctx->domainname) { |
| ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL); |
| if (!ses->domainName) |
| goto get_ses_fail; |
| } |
| if (ctx->domainauto) |
| ses->domainAuto = ctx->domainauto; |
| ses->cred_uid = ctx->cred_uid; |
| ses->linux_uid = ctx->linux_uid; |
| |
| ses->sectype = ctx->sectype; |
| ses->sign = ctx->sign; |
| mutex_lock(&ses->session_mutex); |
| |
| /* add server as first channel */ |
| ses->chans[0].server = server; |
| ses->chan_count = 1; |
| ses->chan_max = ctx->multichannel ? ctx->max_channels:1; |
| |
| rc = cifs_negotiate_protocol(xid, ses); |
| if (!rc) |
| rc = cifs_setup_session(xid, ses, ctx->local_nls); |
| |
| /* each channel uses a different signing key */ |
| memcpy(ses->chans[0].signkey, ses->smb3signingkey, |
| sizeof(ses->smb3signingkey)); |
| |
| mutex_unlock(&ses->session_mutex); |
| if (rc) |
| goto get_ses_fail; |
| |
| /* success, put it on the list and add it as first channel */ |
| spin_lock(&cifs_tcp_ses_lock); |
| list_add(&ses->smb_ses_list, &server->smb_ses_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| free_xid(xid); |
| |
| cifs_setup_ipc(ses, ctx); |
| |
| return ses; |
| |
| get_ses_fail: |
| sesInfoFree(ses); |
| free_xid(xid); |
| return ERR_PTR(rc); |
| } |
| |
| static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) |
| { |
| if (tcon->tidStatus == CifsExiting) |
| return 0; |
| if (strncmp(tcon->treeName, ctx->UNC, MAX_TREE_SIZE)) |
| return 0; |
| if (tcon->seal != ctx->seal) |
| return 0; |
| if (tcon->snapshot_time != ctx->snapshot_time) |
| return 0; |
| if (tcon->handle_timeout != ctx->handle_timeout) |
| return 0; |
| if (tcon->no_lease != ctx->no_lease) |
| return 0; |
| if (tcon->nodelete != ctx->nodelete) |
| return 0; |
| return 1; |
| } |
| |
| static struct cifs_tcon * |
| cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx) |
| { |
| 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); |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| if (tcon->dfs_path) |
| continue; |
| #endif |
| if (!match_tcon(tcon, ctx)) |
| continue; |
| ++tcon->tc_count; |
| spin_unlock(&cifs_tcp_ses_lock); |
| return tcon; |
| } |
| spin_unlock(&cifs_tcp_ses_lock); |
| return NULL; |
| } |
| |
| void |
| cifs_put_tcon(struct cifs_tcon *tcon) |
| { |
| unsigned int xid; |
| struct cifs_ses *ses; |
| |
| /* |
| * IPC tcon share the lifetime of their session and are |
| * destroyed in the session put function |
| */ |
| if (tcon == NULL || tcon->ipc) |
| return; |
| |
| ses = tcon->ses; |
| cifs_dbg(FYI, "%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; |
| } |
| |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| if (tcon->use_witness) { |
| int rc; |
| |
| rc = cifs_swn_unregister(tcon); |
| if (rc < 0) { |
| cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n", |
| __func__, rc); |
| } |
| } |
| #endif |
| |
| list_del_init(&tcon->tcon_list); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| xid = get_xid(); |
| if (ses->server->ops->tree_disconnect) |
| ses->server->ops->tree_disconnect(xid, tcon); |
| _free_xid(xid); |
| |
| cifs_fscache_release_super_cookie(tcon); |
| tconInfoFree(tcon); |
| cifs_put_smb_ses(ses); |
| } |
| |
| /** |
| * cifs_get_tcon - get a tcon matching @ctx data from @ses |
| * |
| * - tcon refcount is the number of mount points using the tcon. |
| * - ses refcount is the number of tcon using the session. |
| * |
| * 1. This function assumes it is being called from cifs_mount() where |
| * we already got a session reference (ses refcount +1). |
| * |
| * 2. Since we're in the context of adding a mount point, the end |
| * result should be either: |
| * |
| * a) a new tcon already allocated with refcount=1 (1 mount point) and |
| * its session refcount incremented (1 new tcon). This +1 was |
| * already done in (1). |
| * |
| * b) an existing tcon with refcount+1 (add a mount point to it) and |
| * identical ses refcount (no new tcon). Because of (1) we need to |
| * decrement the ses refcount. |
| */ |
| static struct cifs_tcon * |
| cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx) |
| { |
| int rc, xid; |
| struct cifs_tcon *tcon; |
| |
| tcon = cifs_find_tcon(ses, ctx); |
| if (tcon) { |
| /* |
| * tcon has refcount already incremented but we need to |
| * decrement extra ses reference gotten by caller (case b) |
| */ |
| cifs_dbg(FYI, "Found match on UNC path\n"); |
| cifs_put_smb_ses(ses); |
| return tcon; |
| } |
| |
| if (!ses->server->ops->tree_connect) { |
| rc = -ENOSYS; |
| goto out_fail; |
| } |
| |
| tcon = tconInfoAlloc(); |
| if (tcon == NULL) { |
| rc = -ENOMEM; |
| goto out_fail; |
| } |
| |
| if (ctx->snapshot_time) { |
| if (ses->server->vals->protocol_id == 0) { |
| cifs_dbg(VFS, |
| "Use SMB2 or later for snapshot mount option\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } else |
| tcon->snapshot_time = ctx->snapshot_time; |
| } |
| |
| if (ctx->handle_timeout) { |
| if (ses->server->vals->protocol_id == 0) { |
| cifs_dbg(VFS, |
| "Use SMB2.1 or later for handle timeout option\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } else |
| tcon->handle_timeout = ctx->handle_timeout; |
| } |
| |
| tcon->ses = ses; |
| if (ctx->password) { |
| tcon->password = kstrdup(ctx->password, GFP_KERNEL); |
| if (!tcon->password) { |
| rc = -ENOMEM; |
| goto out_fail; |
| } |
| } |
| |
| if (ctx->seal) { |
| if (ses->server->vals->protocol_id == 0) { |
| cifs_dbg(VFS, |
| "SMB3 or later required for encryption\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } else if (tcon->ses->server->capabilities & |
| SMB2_GLOBAL_CAP_ENCRYPTION) |
| tcon->seal = true; |
| else { |
| cifs_dbg(VFS, "Encryption is not supported on share\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } |
| } |
| |
| if (ctx->linux_ext) { |
| if (ses->server->posix_ext_supported) { |
| tcon->posix_extensions = true; |
| pr_warn_once("SMB3.11 POSIX Extensions are experimental\n"); |
| } else { |
| cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n"); |
| rc = -EOPNOTSUPP; |
| 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 = get_xid(); |
| rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon, |
| ctx->local_nls); |
| free_xid(xid); |
| cifs_dbg(FYI, "Tcon rc = %d\n", rc); |
| if (rc) |
| goto out_fail; |
| |
| tcon->use_persistent = false; |
| /* check if SMB2 or later, CIFS does not support persistent handles */ |
| if (ctx->persistent) { |
| if (ses->server->vals->protocol_id == 0) { |
| cifs_dbg(VFS, |
| "SMB3 or later required for persistent handles\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } else if (ses->server->capabilities & |
| SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) |
| tcon->use_persistent = true; |
| else /* persistent handles requested but not supported */ { |
| cifs_dbg(VFS, |
| "Persistent handles not supported on share\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } |
| } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY) |
| && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) |
| && (ctx->nopersistent == false)) { |
| cifs_dbg(FYI, "enabling persistent handles\n"); |
| tcon->use_persistent = true; |
| } else if (ctx->resilient) { |
| if (ses->server->vals->protocol_id == 0) { |
| cifs_dbg(VFS, |
| "SMB2.1 or later required for resilient handles\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } |
| tcon->use_resilient = true; |
| } |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| tcon->use_witness = false; |
| if (ctx->witness) { |
| if (ses->server->vals->protocol_id >= SMB30_PROT_ID) { |
| if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) { |
| /* |
| * Set witness in use flag in first place |
| * to retry registration in the echo task |
| */ |
| tcon->use_witness = true; |
| /* And try to register immediately */ |
| rc = cifs_swn_register(tcon); |
| if (rc < 0) { |
| cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc); |
| goto out_fail; |
| } |
| } else { |
| /* TODO: try to extend for non-cluster uses (eg multichannel) */ |
| cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } |
| } else { |
| cifs_dbg(VFS, "SMB3 or later required for witness option\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } |
| } |
| #endif |
| |
| /* If the user really knows what they are doing they can override */ |
| if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) { |
| if (ctx->cache_ro) |
| cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n"); |
| else if (ctx->cache_rw) |
| cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n"); |
| } |
| |
| if (ctx->no_lease) { |
| if (ses->server->vals->protocol_id == 0) { |
| cifs_dbg(VFS, |
| "SMB2 or later required for nolease option\n"); |
| rc = -EOPNOTSUPP; |
| goto out_fail; |
| } else |
| tcon->no_lease = ctx->no_lease; |
| } |
| |
| /* |
| * 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 = ctx->retry; |
| tcon->nocase = ctx->nocase; |
| if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) |
| tcon->nohandlecache = ctx->nohandlecache; |
| else |
| tcon->nohandlecache = 1; |
| tcon->nodelete = ctx->nodelete; |
| tcon->local_lease = ctx->local_lease; |
| INIT_LIST_HEAD(&tcon->pending_opens); |
| |
| 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 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; |
| unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK; |
| unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK; |
| |
| if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK)) |
| return 0; |
| |
| if (old->mnt_cifs_serverino_autodisabled) |
| newflags &= ~CIFS_MOUNT_SERVER_INUM; |
| |
| if (oldflags != newflags) |
| 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->ctx->wsize && new->ctx->wsize < old->ctx->wsize) |
| return 0; |
| |
| if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize) |
| return 0; |
| |
| if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) || |
| !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid)) |
| return 0; |
| |
| if (old->ctx->file_mode != new->ctx->file_mode || |
| old->ctx->dir_mode != new->ctx->dir_mode) |
| return 0; |
| |
| if (strcmp(old->local_nls->charset, new->local_nls->charset)) |
| return 0; |
| |
| if (old->ctx->actimeo != new->ctx->actimeo) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int |
| match_prepath(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; |
| bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) && |
| old->prepath; |
| bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) && |
| new->prepath; |
| |
| if (old_set && new_set && !strcmp(new->prepath, old->prepath)) |
| return 1; |
| else if (!old_set && !new_set) |
| return 1; |
| |
| return 0; |
| } |
| |
| int |
| cifs_match_super(struct super_block *sb, void *data) |
| { |
| struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data; |
| struct smb3_fs_context *ctx; |
| struct cifs_sb_info *cifs_sb; |
| struct TCP_Server_Info *tcp_srv; |
| struct cifs_ses *ses; |
| struct cifs_tcon *tcon; |
| struct tcon_link *tlink; |
| int rc = 0; |
| |
| 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; |
| |
| ctx = mnt_data->ctx; |
| |
| if (!match_server(tcp_srv, ctx) || |
| !match_session(ses, ctx) || |
| !match_tcon(tcon, ctx) || |
| !match_prepath(sb, mnt_data)) { |
| rc = 0; |
| goto out; |
| } |
| |
| rc = compare_mount_options(sb, mnt_data); |
| out: |
| spin_unlock(&cifs_tcp_ses_lock); |
| cifs_put_tlink(tlink); |
| 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_allow_reclassification(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_allow_reclassification(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) |
| cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n", |
| &saddr6->sin6_addr, rc); |
| else |
| cifs_server_dbg(VFS, "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[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[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) { |
| struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr; |
| |
| sport = ipv6->sin6_port; |
| slen = sizeof(struct sockaddr_in6); |
| sfamily = AF_INET6; |
| cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr, |
| ntohs(sport)); |
| } else { |
| struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr; |
| |
| sport = ipv4->sin_port; |
| slen = sizeof(struct sockaddr_in); |
| sfamily = AF_INET; |
| cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr, |
| ntohs(sport)); |
| } |
| |
| if (socket == NULL) { |
| rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM, |
| IPPROTO_TCP, &socket, 1); |
| if (rc < 0) { |
| cifs_server_dbg(VFS, "Error %d creating socket\n", rc); |
| server->ssocket = NULL; |
| return rc; |
| } |
| |
| /* BB other socket options to set KEEPALIVE, NODELAY? */ |
| cifs_dbg(FYI, "Socket created\n"); |
| 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) |
| tcp_sock_set_nodelay(socket->sk); |
| |
| cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n", |
| socket->sk->sk_sndbuf, |
| socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo); |
| |
| rc = socket->ops->connect(socket, saddr, slen, |
| server->noblockcnt ? O_NONBLOCK : 0); |
| /* |
| * When mounting SMB root file systems, we do not want to block in |
| * connect. Otherwise bail out and then let cifs_reconnect() perform |
| * reconnect failover - if possible. |
| */ |
| if (server->noblockcnt && rc == -EINPROGRESS) |
| rc = 0; |
| if (rc < 0) { |
| cifs_dbg(FYI, "Error %d connecting to server\n", 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(unsigned int xid, struct cifs_tcon *tcon, |
| struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) |
| { |
| /* |
| * 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 (ctx && ctx->no_linux_ext) { |
| tcon->fsUnixInfo.Capability = 0; |
| tcon->unix_ext = 0; /* Unix Extensions disabled */ |
| cifs_dbg(FYI, "Linux protocol extensions disabled\n"); |
| return; |
| } else if (ctx) |
| tcon->unix_ext = 1; /* Unix Extensions supported */ |
| |
| if (tcon->unix_ext == 0) { |
| cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n"); |
| return; |
| } |
| |
| if (!CIFSSMBQFSUnixInfo(xid, tcon)) { |
| __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability); |
| cifs_dbg(FYI, "unix caps which server supports %lld\n", cap); |
| /* |
| * check for reconnect case in which we do not |
| * want to change the mount behavior if we can avoid it |
| */ |
| if (ctx == 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) |
| cifs_dbg(VFS, "POSIXPATH support change\n"); |
| cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; |
| } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { |
| cifs_dbg(VFS, "possible reconnect error\n"); |
| cifs_dbg(VFS, "server disabled POSIX path support\n"); |
| } |
| } |
| |
| if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) |
| cifs_dbg(VFS, "per-share encryption not supported yet\n"); |
| |
| cap &= CIFS_UNIX_CAP_MASK; |
| if (ctx && ctx->no_psx_acl) |
| cap &= ~CIFS_UNIX_POSIX_ACL_CAP; |
| else if (CIFS_UNIX_POSIX_ACL_CAP & cap) { |
| cifs_dbg(FYI, "negotiated posix acl support\n"); |
| if (cifs_sb) |
| cifs_sb->mnt_cifs_flags |= |
| CIFS_MOUNT_POSIXACL; |
| } |
| |
| if (ctx && ctx->posix_paths == 0) |
| cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; |
| else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) { |
| cifs_dbg(FYI, "negotiate posix pathnames\n"); |
| if (cifs_sb) |
| cifs_sb->mnt_cifs_flags |= |
| CIFS_MOUNT_POSIX_PATHS; |
| } |
| |
| cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap); |
| #ifdef CONFIG_CIFS_DEBUG2 |
| if (cap & CIFS_UNIX_FCNTL_CAP) |
| cifs_dbg(FYI, "FCNTL cap\n"); |
| if (cap & CIFS_UNIX_EXTATTR_CAP) |
| cifs_dbg(FYI, "EXTATTR cap\n"); |
| if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) |
| cifs_dbg(FYI, "POSIX path cap\n"); |
| if (cap & CIFS_UNIX_XATTR_CAP) |
| cifs_dbg(FYI, "XATTR cap\n"); |
| if (cap & CIFS_UNIX_POSIX_ACL_CAP) |
| cifs_dbg(FYI, "POSIX ACL cap\n"); |
| if (cap & CIFS_UNIX_LARGE_READ_CAP) |
| cifs_dbg(FYI, "very large read cap\n"); |
| if (cap & CIFS_UNIX_LARGE_WRITE_CAP) |
| cifs_dbg(FYI, "very large write cap\n"); |
| if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP) |
| cifs_dbg(FYI, "transport encryption cap\n"); |
| if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) |
| cifs_dbg(FYI, "mandatory transport encryption cap\n"); |
| #endif /* CIFS_DEBUG2 */ |
| if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) { |
| if (ctx == NULL) |
| cifs_dbg(FYI, "resetting capabilities failed\n"); |
| else |
| cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n"); |
| |
| } |
| } |
| } |
| |
| int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb) |
| { |
| struct smb3_fs_context *ctx = cifs_sb->ctx; |
| |
| INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks); |
| |
| spin_lock_init(&cifs_sb->tlink_tree_lock); |
| cifs_sb->tlink_tree = RB_ROOT; |
| |
| cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n", |
| ctx->file_mode, ctx->dir_mode); |
| |
| /* this is needed for ASCII cp to Unicode converts */ |
| if (ctx->iocharset == NULL) { |
| /* load_nls_default cannot return null */ |
| cifs_sb->local_nls = load_nls_default(); |
| } else { |
| cifs_sb->local_nls = load_nls(ctx->iocharset); |
| if (cifs_sb->local_nls == NULL) { |
| cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n", |
| ctx->iocharset); |
| return -ELIBACC; |
| } |
| } |
| ctx->local_nls = cifs_sb->local_nls; |
| |
| smb3_update_mnt_flags(cifs_sb); |
| |
| if (ctx->direct_io) |
| cifs_dbg(FYI, "mounting share using direct i/o\n"); |
| if (ctx->cache_ro) { |
| cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n"); |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE; |
| } else if (ctx->cache_rw) { |
| cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n"); |
| cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE | |
| CIFS_MOUNT_RW_CACHE); |
| } |
| |
| if ((ctx->cifs_acl) && (ctx->dynperm)) |
| cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n"); |
| |
| if (ctx->prepath) { |
| cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL); |
| if (cifs_sb->prepath == NULL) |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| /* Release all succeed connections */ |
| static inline void mount_put_conns(struct cifs_sb_info *cifs_sb, |
| unsigned int xid, |
| struct TCP_Server_Info *server, |
| struct cifs_ses *ses, struct cifs_tcon *tcon) |
| { |
| int rc = 0; |
| |
| if (tcon) |
| cifs_put_tcon(tcon); |
| else if (ses) |
| cifs_put_smb_ses(ses); |
| else if (server) |
| cifs_put_tcp_session(server, 0); |
| cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS; |
| free_xid(xid); |
| } |
| |
| /* Get connections for tcp, ses and tcon */ |
| static int mount_get_conns(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb, |
| unsigned int *xid, |
| struct TCP_Server_Info **nserver, |
| struct cifs_ses **nses, struct cifs_tcon **ntcon) |
| { |
| int rc = 0; |
| struct TCP_Server_Info *server; |
| struct cifs_ses *ses; |
| struct cifs_tcon *tcon; |
| |
| *nserver = NULL; |
| *nses = NULL; |
| *ntcon = NULL; |
| |
| *xid = get_xid(); |
| |
| /* get a reference to a tcp session */ |
| server = cifs_get_tcp_session(ctx); |
| if (IS_ERR(server)) { |
| rc = PTR_ERR(server); |
| return rc; |
| } |
| |
| *nserver = server; |
| |
| if ((ctx->max_credits < 20) || (ctx->max_credits > 60000)) |
| server->max_credits = SMB2_MAX_CREDITS_AVAILABLE; |
| else |
| server->max_credits = ctx->max_credits; |
| |
| /* get a reference to a SMB session */ |
| ses = cifs_get_smb_ses(server, ctx); |
| if (IS_ERR(ses)) { |
| rc = PTR_ERR(ses); |
| return rc; |
| } |
| |
| *nses = ses; |
| |
| if ((ctx->persistent == true) && (!(ses->server->capabilities & |
| SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) { |
| cifs_server_dbg(VFS, "persistent handles not supported by server\n"); |
| return -EOPNOTSUPP; |
| } |
| |
| /* search for existing tcon to this server share */ |
| tcon = cifs_get_tcon(ses, ctx); |
| if (IS_ERR(tcon)) { |
| rc = PTR_ERR(tcon); |
| return rc; |
| } |
| |
| *ntcon = tcon; |
| |
| /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */ |
| if (tcon->posix_extensions) |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS; |
| |
| /* tell server which Unix caps we support */ |
| if (cap_unix(tcon->ses)) { |
| /* |
| * reset of caps checks mount to see if unix extensions disabled |
| * for just this mount. |
| */ |
| reset_cifs_unix_caps(*xid, tcon, cifs_sb, ctx); |
| if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) && |
| (le64_to_cpu(tcon->fsUnixInfo.Capability) & |
| CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) |
| return -EACCES; |
| } else |
| tcon->unix_ext = 0; /* server does not support them */ |
| |
| /* do not care if a following call succeed - informational */ |
| if (!tcon->pipe && server->ops->qfs_tcon) { |
| server->ops->qfs_tcon(*xid, tcon, cifs_sb); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) { |
| if (tcon->fsDevInfo.DeviceCharacteristics & |
| cpu_to_le32(FILE_READ_ONLY_DEVICE)) |
| cifs_dbg(VFS, "mounted to read only share\n"); |
| else if ((cifs_sb->mnt_cifs_flags & |
| CIFS_MOUNT_RW_CACHE) == 0) |
| cifs_dbg(VFS, "read only mount of RW share\n"); |
| /* no need to log a RW mount of a typical RW share */ |
| } |
| } |
| |
| /* |
| * Clamp the rsize/wsize mount arguments if they are too big for the server |
| * and set the rsize/wsize to the negotiated values if not passed in by |
| * the user on mount |
| */ |
| if ((cifs_sb->ctx->wsize == 0) || |
| (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx))) |
| cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx); |
| if ((cifs_sb->ctx->rsize == 0) || |
| (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx))) |
| cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx); |
| |
| return 0; |
| } |
| |
| static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses, |
| struct cifs_tcon *tcon) |
| { |
| struct tcon_link *tlink; |
| |
| /* hang the tcon off of the superblock */ |
| tlink = kzalloc(sizeof(*tlink), GFP_KERNEL); |
| if (tlink == NULL) |
| return -ENOMEM; |
| |
| tlink->tl_uid = ses->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(cifsiod_wq, &cifs_sb->prune_tlinks, |
| TLINK_IDLE_EXPIRE); |
| return 0; |
| } |
| |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| /* |
| * cifs_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 smb3_fs_context *ctx, |
| const struct cifs_sb_info *cifs_sb, bool useppath) |
| { |
| char *full_path, *pos; |
| unsigned int pplen = useppath && ctx->prepath ? |
| strlen(ctx->prepath) + 1 : 0; |
| unsigned int unc_len = strnlen(ctx->UNC, MAX_TREE_SIZE + 1); |
| |
| if (unc_len > MAX_TREE_SIZE) |
| return ERR_PTR(-EINVAL); |
| |
| full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL); |
| if (full_path == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| memcpy(full_path, ctx->UNC, unc_len); |
| pos = full_path + unc_len; |
| |
| if (pplen) { |
| *pos = CIFS_DIR_SEP(cifs_sb); |
| memcpy(pos + 1, ctx->prepath, pplen); |
| pos += pplen; |
| } |
| |
| *pos = '\0'; /* add trailing null */ |
| convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb)); |
| cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path); |
| return full_path; |
| } |
| |
| /** |
| * expand_dfs_referral - Perform a dfs referral query and update the cifs_sb |
| * |
| * If a referral is found, cifs_sb->ctx->mount_options 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(const unsigned int xid, struct cifs_ses *ses, |
| struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb, |
| char *ref_path) |
| { |
| int rc; |
| struct dfs_info3_param referral = {0}; |
| char *full_path = NULL, *mdata = NULL; |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) |
| return -EREMOTE; |
| |
| full_path = build_unc_path_to_root(ctx, cifs_sb, true); |
| if (IS_ERR(full_path)) |
| return PTR_ERR(full_path); |
| |
| rc = dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb), |
| ref_path, &referral, NULL); |
| if (!rc) { |
| mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options, |
| full_path + 1, &referral); |
| free_dfs_info_param(&referral); |
| |
| if (IS_ERR(mdata)) { |
| rc = PTR_ERR(mdata); |
| mdata = NULL; |
| } else { |
| smb3_cleanup_fs_context_contents(ctx); |
| rc = cifs_setup_volume_info(ctx); |
| } |
| kfree(cifs_sb->ctx->mount_options); |
| cifs_sb->ctx->mount_options = mdata; |
| } |
| kfree(full_path); |
| return rc; |
| } |
| |
| static inline int get_next_dfs_tgt(const char *path, |
| struct dfs_cache_tgt_list *tgt_list, |
| struct dfs_cache_tgt_iterator **tgt_it) |
| { |
| if (!*tgt_it) |
| *tgt_it = dfs_cache_get_tgt_iterator(tgt_list); |
| else |
| *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it); |
| return !*tgt_it ? -EHOSTDOWN : 0; |
| } |
| |
| static int update_vol_info(const struct dfs_cache_tgt_iterator *tgt_it, |
| struct smb3_fs_context *fake_ctx, struct smb3_fs_context *ctx) |
| { |
| const char *tgt = dfs_cache_get_tgt_name(tgt_it); |
| int len = strlen(tgt) + 2; |
| char *new_unc; |
| |
| new_unc = kmalloc(len, GFP_KERNEL); |
| if (!new_unc) |
| return -ENOMEM; |
| scnprintf(new_unc, len, "\\%s", tgt); |
| |
| kfree(ctx->UNC); |
| ctx->UNC = new_unc; |
| |
| if (fake_ctx->prepath) { |
| kfree(ctx->prepath); |
| ctx->prepath = fake_ctx->prepath; |
| fake_ctx->prepath = NULL; |
| } |
| memcpy(&ctx->dstaddr, &fake_ctx->dstaddr, sizeof(ctx->dstaddr)); |
| |
| return 0; |
| } |
| |
| static int setup_dfs_tgt_conn(const char *path, const char *full_path, |
| const struct dfs_cache_tgt_iterator *tgt_it, |
| struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx, |
| unsigned int *xid, struct TCP_Server_Info **server, |
| struct cifs_ses **ses, struct cifs_tcon **tcon) |
| { |
| int rc; |
| struct dfs_info3_param ref = {0}; |
| char *mdata = NULL; |
| struct smb3_fs_context fake_ctx = {NULL}; |
| |
| cifs_dbg(FYI, "%s: dfs path: %s\n", __func__, path); |
| |
| rc = dfs_cache_get_tgt_referral(path, tgt_it, &ref); |
| if (rc) |
| return rc; |
| |
| mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options, |
| full_path + 1, &ref); |
| free_dfs_info_param(&ref); |
| |
| if (IS_ERR(mdata)) { |
| rc = PTR_ERR(mdata); |
| mdata = NULL; |
| } else |
| rc = cifs_setup_volume_info(&fake_ctx); |
| |
| kfree(mdata); |
| |
| if (!rc) { |
| /* |
| * We use a 'fake_ctx' here because we need pass it down to the |
| * mount_{get,put} functions to test connection against new DFS |
| * targets. |
| */ |
| mount_put_conns(cifs_sb, *xid, *server, *ses, *tcon); |
| rc = mount_get_conns(&fake_ctx, cifs_sb, xid, server, ses, |
| tcon); |
| if (!rc || (*server && *ses)) { |
| /* |
| * We were able to connect to new target server. |
| * Update current context with new target server. |
| */ |
| rc = update_vol_info(tgt_it, &fake_ctx, ctx); |
| } |
| } |
| smb3_cleanup_fs_context_contents(&fake_ctx); |
| return rc; |
| } |
| |
| static int do_dfs_failover(const char *path, const char *full_path, struct cifs_sb_info *cifs_sb, |
| struct smb3_fs_context *ctx, struct cifs_ses *root_ses, |
| unsigned int *xid, struct TCP_Server_Info **server, |
| struct cifs_ses **ses, struct cifs_tcon **tcon) |
| { |
| int rc; |
| struct dfs_cache_tgt_list tgt_list; |
| struct dfs_cache_tgt_iterator *tgt_it = NULL; |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) |
| return -EOPNOTSUPP; |
| |
| rc = dfs_cache_noreq_find(path, NULL, &tgt_list); |
| if (rc) |
| return rc; |
| |
| for (;;) { |
| /* Get next DFS target server - if any */ |
| rc = get_next_dfs_tgt(path, &tgt_list, &tgt_it); |
| if (rc) |
| break; |
| /* Connect to next DFS target */ |
| rc = setup_dfs_tgt_conn(path, full_path, tgt_it, cifs_sb, ctx, xid, server, ses, |
| tcon); |
| if (!rc || (*server && *ses)) |
| break; |
| } |
| if (!rc) { |
| /* |
| * Update DFS target hint in DFS referral cache with the target |
| * server we successfully reconnected to. |
| */ |
| rc = dfs_cache_update_tgthint(*xid, root_ses ? root_ses : *ses, |
| cifs_sb->local_nls, |
| cifs_remap(cifs_sb), path, |
| tgt_it); |
| } |
| dfs_cache_free_tgts(&tgt_list); |
| return rc; |
| } |
| #endif |
| |
| /* TODO: all callers to this are broken. We are not parsing mount_options here |
| * we should pass a clone of the original context? |
| */ |
| int |
| cifs_setup_volume_info(struct smb3_fs_context *ctx) |
| { |
| int rc = 0; |
| |
| if (ctx->nullauth) { |
| cifs_dbg(FYI, "Anonymous login\n"); |
| kfree(ctx->username); |
| ctx->username = NULL; |
| } else if (ctx->username) { |
| /* BB fixme parse for domain name here */ |
| cifs_dbg(FYI, "Username: %s\n", ctx->username); |
| } else { |
| cifs_dbg(VFS, "No username specified\n"); |
| /* In userspace mount helper we can get user name from alternate |
| locations such as env variables and files on disk */ |
| return -EINVAL; |
| } |
| |
| return rc; |
| } |
| |
| static int |
| cifs_are_all_path_components_accessible(struct TCP_Server_Info *server, |
| unsigned int xid, |
| struct cifs_tcon *tcon, |
| struct cifs_sb_info *cifs_sb, |
| char *full_path, |
| int added_treename) |
| { |
| int rc; |
| char *s; |
| char sep, tmp; |
| int skip = added_treename ? 1 : 0; |
| |
| sep = CIFS_DIR_SEP(cifs_sb); |
| s = full_path; |
| |
| rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, ""); |
| while (rc == 0) { |
| /* skip separators */ |
| while (*s == sep) |
| s++; |
| if (!*s) |
| break; |
| /* next separator */ |
| while (*s && *s != sep) |
| s++; |
| /* |
| * if the treename is added, we then have to skip the first |
| * part within the separators |
| */ |
| if (skip) { |
| skip = 0; |
| continue; |
| } |
| /* |
| * temporarily null-terminate the path at the end of |
| * the current component |
| */ |
| tmp = *s; |
| *s = 0; |
| rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, |
| full_path); |
| *s = tmp; |
| } |
| return rc; |
| } |
| |
| /* |
| * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is, |
| * otherwise 0. |
| */ |
| static int is_path_remote(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx, |
| const unsigned int xid, |
| struct TCP_Server_Info *server, |
| struct cifs_tcon *tcon) |
| { |
| int rc; |
| char *full_path; |
| |
| if (!server->ops->is_path_accessible) |
| return -EOPNOTSUPP; |
| |
| /* |
| * cifs_build_path_to_root works only when we have a valid tcon |
| */ |
| full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon, |
| tcon->Flags & SMB_SHARE_IS_IN_DFS); |
| if (full_path == NULL) |
| return -ENOMEM; |
| |
| cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path); |
| |
| rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, |
| full_path); |
| if (rc != 0 && rc != -EREMOTE) { |
| kfree(full_path); |
| return rc; |
| } |
| |
| if (rc != -EREMOTE) { |
| rc = cifs_are_all_path_components_accessible(server, xid, tcon, |
| cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS); |
| if (rc != 0) { |
| cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n"); |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; |
| rc = 0; |
| } |
| } |
| |
| kfree(full_path); |
| return rc; |
| } |
| |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| static void set_root_ses(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses, |
| struct cifs_ses **root_ses) |
| { |
| if (ses) { |
| spin_lock(&cifs_tcp_ses_lock); |
| ses->ses_count++; |
| if (ses->tcon_ipc) |
| ses->tcon_ipc->remap = cifs_remap(cifs_sb); |
| spin_unlock(&cifs_tcp_ses_lock); |
| } |
| *root_ses = ses; |
| } |
| |
| static void put_root_ses(struct cifs_ses *ses) |
| { |
| if (ses) |
| cifs_put_smb_ses(ses); |
| } |
| |
| /* Check if a path component is remote and then update @dfs_path accordingly */ |
| static int check_dfs_prepath(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx, |
| const unsigned int xid, struct TCP_Server_Info *server, |
| struct cifs_tcon *tcon, char **dfs_path) |
| { |
| char *path, *s; |
| char sep = CIFS_DIR_SEP(cifs_sb), tmp; |
| char *npath; |
| int rc = 0; |
| int added_treename = tcon->Flags & SMB_SHARE_IS_IN_DFS; |
| int skip = added_treename; |
| |
| path = cifs_build_path_to_root(ctx, cifs_sb, tcon, added_treename); |
| if (!path) |
| return -ENOMEM; |
| |
| /* |
| * Walk through the path components in @path and check if they're accessible. In case any of |
| * the components is -EREMOTE, then update @dfs_path with the next DFS referral request path |
| * (NOT including the remaining components). |
| */ |
| s = path; |
| do { |
| /* skip separators */ |
| while (*s && *s == sep) |
| s++; |
| if (!*s) |
| break; |
| /* next separator */ |
| while (*s && *s != sep) |
| s++; |
| /* |
| * if the treename is added, we then have to skip the first |
| * part within the separators |
| */ |
| if (skip) { |
| skip = 0; |
| continue; |
| } |
| tmp = *s; |
| *s = 0; |
| rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, path); |
| if (rc && rc == -EREMOTE) { |
| struct smb3_fs_context v = {NULL}; |
| /* if @path contains a tree name, skip it in the prefix path */ |
| if (added_treename) { |
| rc = smb3_parse_devname(path, &v); |
| if (rc) |
| break; |
| rc = -EREMOTE; |
| npath = build_unc_path_to_root(&v, cifs_sb, true); |
| smb3_cleanup_fs_context_contents(&v); |
| } else { |
| v.UNC = ctx->UNC; |
| v.prepath = path + 1; |
| npath = build_unc_path_to_root(&v, cifs_sb, true); |
| } |
| if (IS_ERR(npath)) { |
| rc = PTR_ERR(npath); |
| break; |
| } |
| kfree(*dfs_path); |
| *dfs_path = npath; |
| } |
| *s = tmp; |
| } while (rc == 0); |
| |
| kfree(path); |
| return rc; |
| } |
| |
| int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) |
| { |
| int rc = 0; |
| unsigned int xid; |
| struct TCP_Server_Info *server = NULL; |
| struct cifs_ses *ses = NULL, *root_ses = NULL; |
| struct cifs_tcon *tcon = NULL; |
| int count = 0; |
| char *ref_path = NULL, *full_path = NULL; |
| char *oldmnt = NULL; |
| char *mntdata = NULL; |
| |
| rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon); |
| /* |
| * Unconditionally try to get an DFS referral (even cached) to determine whether it is an |
| * DFS mount. |
| * |
| * Skip prefix path 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. |
| */ |
| if (dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb), ctx->UNC + 1, NULL, |
| NULL)) { |
| /* No DFS referral was returned. Looks like a regular share. */ |
| if (rc) |
| goto error; |
| /* Check if it is fully accessible and then mount it */ |
| rc = is_path_remote(cifs_sb, ctx, xid, server, tcon); |
| if (!rc) |
| goto out; |
| if (rc != -EREMOTE) |
| goto error; |
| } |
| /* Save mount options */ |
| mntdata = kstrndup(cifs_sb->ctx->mount_options, |
| strlen(cifs_sb->ctx->mount_options), GFP_KERNEL); |
| if (!mntdata) { |
| rc = -ENOMEM; |
| goto error; |
| } |
| /* Get path of DFS root */ |
| ref_path = build_unc_path_to_root(ctx, cifs_sb, false); |
| if (IS_ERR(ref_path)) { |
| rc = PTR_ERR(ref_path); |
| ref_path = NULL; |
| goto error; |
| } |
| |
| set_root_ses(cifs_sb, ses, &root_ses); |
| do { |
| /* Save full path of last DFS path we used to resolve final target server */ |
| kfree(full_path); |
| full_path = build_unc_path_to_root(ctx, cifs_sb, !!count); |
| if (IS_ERR(full_path)) { |
| rc = PTR_ERR(full_path); |
| full_path = NULL; |
| break; |
| } |
| /* Chase referral */ |
| oldmnt = cifs_sb->ctx->mount_options; |
| rc = expand_dfs_referral(xid, root_ses, ctx, cifs_sb, ref_path + 1); |
| if (rc) |
| break; |
| /* Connect to new DFS target only if we were redirected */ |
| if (oldmnt != cifs_sb->ctx->mount_options) { |
| mount_put_conns(cifs_sb, xid, server, ses, tcon); |
| rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon); |
| } |
| if (rc && !server && !ses) { |
| /* Failed to connect. Try to connect to other targets in the referral. */ |
| rc = do_dfs_failover(ref_path + 1, full_path, cifs_sb, ctx, root_ses, &xid, |
| &server, &ses, &tcon); |
| } |
| if (rc == -EACCES || rc == -EOPNOTSUPP || !server || !ses) |
| break; |
| if (!tcon) |
| continue; |
| /* Make sure that requests go through new root servers */ |
| if (is_tcon_dfs(tcon)) { |
| put_root_ses(root_ses); |
| set_root_ses(cifs_sb, ses, &root_ses); |
| } |
| /* Check for remaining path components and then continue chasing them (-EREMOTE) */ |
| rc = check_dfs_prepath(cifs_sb, ctx, xid, server, tcon, &ref_path); |
| /* Prevent recursion on broken link referrals */ |
| if (rc == -EREMOTE && ++count > MAX_NESTED_LINKS) |
| rc = -ELOOP; |
| } while (rc == -EREMOTE); |
| |
| if (rc) |
| goto error; |
| put_root_ses(root_ses); |
| root_ses = NULL; |
| kfree(ref_path); |
| ref_path = NULL; |
| /* |
| * Store DFS full path in both superblock and tree connect structures. |
| * |
| * For DFS root mounts, the prefix path (cifs_sb->prepath) is preserved during reconnect so |
| * only the root path is set in cifs_sb->origin_fullpath and tcon->dfs_path. And for DFS |
| * links, the prefix path is included in both and may be changed during reconnect. See |
| * cifs_tree_connect(). |
| */ |
| cifs_sb->origin_fullpath = kstrndup(full_path, strlen(full_path), GFP_KERNEL); |
| if (!cifs_sb->origin_fullpath) { |
| rc = -ENOMEM; |
| goto error; |
| } |
| spin_lock(&cifs_tcp_ses_lock); |
| tcon->dfs_path = full_path; |
| full_path = NULL; |
| tcon->remap = cifs_remap(cifs_sb); |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| /* Add original context for DFS cache to be used when refreshing referrals */ |
| rc = dfs_cache_add_vol(mntdata, ctx, cifs_sb->origin_fullpath); |
| if (rc) |
| goto error; |
| /* |
| * After reconnecting to a different server, unique ids won't |
| * match anymore, so we disable serverino. This prevents |
| * dentry revalidation to think the dentry are stale (ESTALE). |
| */ |
| cifs_autodisable_serverino(cifs_sb); |
| /* |
| * Force the use of prefix path to support failover on DFS paths that |
| * resolve to targets that have different prefix paths. |
| */ |
| cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; |
| kfree(cifs_sb->prepath); |
| cifs_sb->prepath = ctx->prepath; |
| ctx->prepath = NULL; |
| |
| out: |
| free_xid(xid); |
| cifs_try_adding_channels(cifs_sb, ses); |
| return mount_setup_tlink(cifs_sb, ses, tcon); |
| |
| error: |
| kfree(ref_path); |
| kfree(full_path); |
| kfree(mntdata); |
| kfree(cifs_sb->origin_fullpath); |
| put_root_ses(root_ses); |
| mount_put_conns(cifs_sb, xid, server, ses, tcon); |
| return rc; |
| } |
| #else |
| int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) |
| { |
| int rc = 0; |
| unsigned int xid; |
| struct cifs_ses *ses; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| |
| rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon); |
| if (rc) |
| goto error; |
| |
| if (tcon) { |
| rc = is_path_remote(cifs_sb, ctx, xid, server, tcon); |
| if (rc == -EREMOTE) |
| rc = -EOPNOTSUPP; |
| if (rc) |
| goto error; |
| } |
| |
| free_xid(xid); |
| |
| return mount_setup_tlink(cifs_sb, ses, tcon); |
| |
| error: |
| mount_put_conns(cifs_sb, xid, server, ses, tcon); |
| return rc; |
| } |
| #endif |
| |
| /* |
| * Issue a TREE_CONNECT request. |
| */ |
| int |
| CIFSTCon(const 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 = get_next_mid(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->pipe || (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->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); |
| if (rc) { |
| cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n", |
| __func__, rc); |
| cifs_buf_release(smb_buffer); |
| return rc; |
| } |
| |
| 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->sign) |
| 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]; |
| be32_add_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) { |
| 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')) { |
| cifs_dbg(FYI, "IPC connection\n"); |
| tcon->ipc = true; |
| tcon->pipe = true; |
| } |
| } else if (length == 2) { |
| if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) { |
| /* the most common case */ |
| cifs_dbg(FYI, "disk share connection\n"); |
| } |
| } |
| bcc_ptr += length + 1; |
| bytes_left -= (length + 1); |
| strlcpy(tcon->treeName, tree, sizeof(tcon->treeName)); |
| |
| /* 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); |
| |
| cifs_dbg(FYI, "nativeFileSystem=%s\n", 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; |
| cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags); |
| } |
| |
| cifs_buf_release(smb_buffer); |
| return rc; |
| } |
| |
| static void delayed_free(struct rcu_head *p) |
| { |
| struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu); |
| |
| unload_nls(cifs_sb->local_nls); |
| smb3_cleanup_fs_context(cifs_sb->ctx); |
| kfree(cifs_sb); |
| } |
| |
| 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); |
| |
| kfree(cifs_sb->prepath); |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| dfs_cache_del_vol(cifs_sb->origin_fullpath); |
| kfree(cifs_sb->origin_fullpath); |
| #endif |
| call_rcu(&cifs_sb->rcu, delayed_free); |
| } |
| |
| int |
| cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses) |
| { |
| int rc = 0; |
| struct TCP_Server_Info *server = cifs_ses_server(ses); |
| |
| if (!server->ops->need_neg || !server->ops->negotiate) |
| return -ENOSYS; |
| |
| /* only send once per connect */ |
| if (!server->ops->need_neg(server)) |
| return 0; |
| |
| rc = server->ops->negotiate(xid, ses); |
| 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(const unsigned int xid, struct cifs_ses *ses, |
| struct nls_table *nls_info) |
| { |
| int rc = -ENOSYS; |
| struct TCP_Server_Info *server = cifs_ses_server(ses); |
| |
| if (!ses->binding) { |
| ses->capabilities = server->capabilities; |
| if (linuxExtEnabled == 0) |
| ses->capabilities &= (~server->vals->cap_unix); |
| |
| if (ses->auth_key.response) { |
| cifs_dbg(FYI, "Free previous auth_key.response = %p\n", |
| ses->auth_key.response); |
| kfree(ses->auth_key.response); |
| ses->auth_key.response = NULL; |
| ses->auth_key.len = 0; |
| } |
| } |
| |
| cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n", |
| server->sec_mode, server->capabilities, server->timeAdj); |
| |
| if (server->ops->sess_setup) |
| rc = server->ops->sess_setup(xid, ses, nls_info); |
| |
| if (rc) |
| cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc); |
| |
| return rc; |
| } |
| |
| static int |
| cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses) |
| { |
| ctx->sectype = ses->sectype; |
| |
| /* krb5 is special, since we don't need username or pw */ |
| if (ctx->sectype == Kerberos) |
| return 0; |
| |
| return cifs_set_cifscreds(ctx, ses); |
| } |
| |
| static struct cifs_tcon * |
| cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_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 smb3_fs_context *ctx; |
| |
| ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
| if (ctx == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| ctx->local_nls = cifs_sb->local_nls; |
| ctx->linux_uid = fsuid; |
| ctx->cred_uid = fsuid; |
| ctx->UNC = master_tcon->treeName; |
| ctx->retry = master_tcon->retry; |
| ctx->nocase = master_tcon->nocase; |
| ctx->nohandlecache = master_tcon->nohandlecache; |
| ctx->local_lease = master_tcon->local_lease; |
| ctx->no_lease = master_tcon->no_lease; |
| ctx->resilient = master_tcon->use_resilient; |
| ctx->persistent = master_tcon->use_persistent; |
| ctx->handle_timeout = master_tcon->handle_timeout; |
| ctx->no_linux_ext = !master_tcon->unix_ext; |
| ctx->linux_ext = master_tcon->posix_extensions; |
| ctx->sectype = master_tcon->ses->sectype; |
| ctx->sign = master_tcon->ses->sign; |
| ctx->seal = master_tcon->seal; |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| ctx->witness = master_tcon->use_witness; |
| #endif |
| |
| rc = cifs_set_vol_auth(ctx, 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, ctx); |
| if (IS_ERR(ses)) { |
| tcon = (struct cifs_tcon *)ses; |
| cifs_put_tcp_session(master_tcon->ses->server, 0); |
| goto out; |
| } |
| |
| tcon = cifs_get_tcon(ses, ctx); |
| if (IS_ERR(tcon)) { |
| cifs_put_smb_ses(ses); |
| goto out; |
| } |
| |
| if (cap_unix(ses)) |
| reset_cifs_unix_caps(0, tcon, NULL, ctx); |
| |
| out: |
| kfree(ctx->username); |
| kfree_sensitive(ctx->password); |
| kfree(ctx); |
| |
| return tcon; |
| } |
| |
| struct cifs_tcon * |
| cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb) |
| { |
| return tlink_tcon(cifs_sb_master_tlink(cifs_sb)); |
| } |
| |
| /* find and return a tlink with given uid */ |
| static struct tcon_link * |
| tlink_rb_search(struct rb_root *root, kuid_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 (uid_gt(tlink->tl_uid, uid)) |
| node = node->rb_left; |
| else if (uid_lt(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 (uid_gt(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; |
| kuid_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, |
| TASK_INTERRUPTIBLE); |
| if (ret) { |
| cifs_put_tlink(tlink); |
| return ERR_PTR(-ERESTARTSYS); |
| } |
| |
| /* 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; |
| 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(cifsiod_wq, &cifs_sb->prune_tlinks, |
| TLINK_IDLE_EXPIRE); |
| } |
| |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc) |
| { |
| int rc; |
| struct TCP_Server_Info *server = tcon->ses->server; |
| const struct smb_version_operations *ops = server->ops; |
| struct dfs_cache_tgt_list tl; |
| struct dfs_cache_tgt_iterator *it = NULL; |
| char *tree; |
| const char *tcp_host; |
| size_t tcp_host_len; |
| const char *dfs_host; |
| size_t dfs_host_len; |
| char *share = NULL, *prefix = NULL; |
| struct dfs_info3_param ref = {0}; |
| bool isroot; |
| |
| tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL); |
| if (!tree) |
| return -ENOMEM; |
| |
| if (!tcon->dfs_path) { |
| if (tcon->ipc) { |
| scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname); |
| rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc); |
| } else { |
| rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc); |
| } |
| goto out; |
| } |
| |
| rc = dfs_cache_noreq_find(tcon->dfs_path + 1, &ref, &tl); |
| if (rc) |
| goto out; |
| isroot = ref.server_type == DFS_TYPE_ROOT; |
| free_dfs_info_param(&ref); |
| |
| extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len); |
| |
| for (it = dfs_cache_get_tgt_iterator(&tl); it; it = dfs_cache_get_next_tgt(&tl, it)) { |
| bool target_match; |
| |
| kfree(share); |
| kfree(prefix); |
| share = NULL; |
| prefix = NULL; |
| |
| rc = dfs_cache_get_tgt_share(tcon->dfs_path + 1, it, &share, &prefix); |
| if (rc) { |
| cifs_dbg(VFS, "%s: failed to parse target share %d\n", |
| __func__, rc); |
| continue; |
| } |
| |
| extract_unc_hostname(share, &dfs_host, &dfs_host_len); |
| |
| if (dfs_host_len != tcp_host_len |
| || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) { |
| cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n", __func__, (int)dfs_host_len, |
| dfs_host, (int)tcp_host_len, tcp_host); |
| |
| rc = match_target_ip(server, dfs_host, dfs_host_len, &target_match); |
| if (rc) { |
| cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc); |
| break; |
| } |
| |
| if (!target_match) { |
| cifs_dbg(FYI, "%s: skipping target\n", __func__); |
| continue; |
| } |
| } |
| |
| if (tcon->ipc) { |
| scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", share); |
| rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc); |
| } else { |
| scnprintf(tree, MAX_TREE_SIZE, "\\%s", share); |
| rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc); |
| /* Only handle prefix paths of DFS link targets */ |
| if (!rc && !isroot) { |
| rc = update_super_prepath(tcon, prefix); |
| break; |
| } |
| } |
| if (rc == -EREMOTE) |
| break; |
| } |
| |
| kfree(share); |
| kfree(prefix); |
| |
| if (!rc) { |
| if (it) |
| rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1, it); |
| else |
| rc = -ENOENT; |
| } |
| dfs_cache_free_tgts(&tl); |
| out: |
| kfree(tree); |
| return rc; |
| } |
| #else |
| int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc) |
| { |
| const struct smb_version_operations *ops = tcon->ses->server->ops; |
| |
| return ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc); |
| } |
| #endif |