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-rw-r--r--fs/cifs/connect.c572
1 files changed, 509 insertions, 63 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 88c84a3..251a17c 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -47,7 +47,6 @@
#include "ntlmssp.h"
#include "nterr.h"
#include "rfc1002pdu.h"
-#include "cn_cifs.h"
#include "fscache.h"
#define CIFS_PORT 445
@@ -100,16 +99,25 @@ struct smb_vol {
bool noautotune:1;
bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
bool fsc:1; /* enable fscache */
+ bool mfsymlinks:1; /* use Minshall+French Symlinks */
+ bool multiuser:1;
unsigned int rsize;
unsigned int wsize;
bool sockopt_tcp_nodelay:1;
unsigned short int port;
char *prepath;
+ struct sockaddr_storage srcaddr; /* allow binding to a local IP */
struct nls_table *local_nls;
};
+/* FIXME: should these be tunable? */
+#define TLINK_ERROR_EXPIRE (1 * HZ)
+#define TLINK_IDLE_EXPIRE (600 * HZ)
+
static int ipv4_connect(struct TCP_Server_Info *server);
static int ipv6_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);
/*
* cifs tcp session reconnection
@@ -143,7 +151,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
/* before reconnecting the tcp session, mark the smb session (uid)
and the tid bad so they are not used until reconnected */
- read_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp, &server->smb_ses_list) {
ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
ses->need_reconnect = true;
@@ -153,7 +161,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
tcon->need_reconnect = true;
}
}
- read_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
/* do not want to be sending data on a socket we are freeing */
mutex_lock(&server->srv_mutex);
if (server->ssocket) {
@@ -166,6 +174,11 @@ cifs_reconnect(struct TCP_Server_Info *server)
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;
spin_lock(&GlobalMid_Lock);
list_for_each(tmp, &server->pending_mid_q) {
@@ -198,7 +211,6 @@ cifs_reconnect(struct TCP_Server_Info *server)
spin_lock(&GlobalMid_Lock);
if (server->tcpStatus != CifsExiting)
server->tcpStatus = CifsGood;
- server->sequence_number = 0;
spin_unlock(&GlobalMid_Lock);
/* atomic_set(&server->inFlight,0);*/
wake_up(&server->response_q);
@@ -629,9 +641,9 @@ multi_t2_fnd:
} /* end while !EXITING */
/* take it off the list, if it's not already */
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_del_init(&server->tcp_ses_list);
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
spin_lock(&GlobalMid_Lock);
server->tcpStatus = CifsExiting;
@@ -669,7 +681,7 @@ multi_t2_fnd:
* BB: we shouldn't have to do any of this. It shouldn't be
* possible to exit from the thread with active SMB sessions
*/
- read_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
if (list_empty(&server->pending_mid_q)) {
/* loop through server session structures attached to this and
mark them dead */
@@ -679,7 +691,7 @@ multi_t2_fnd:
ses->status = CifsExiting;
ses->server = NULL;
}
- read_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
} else {
/* although we can not zero the server struct pointer yet,
since there are active requests which may depnd on them,
@@ -702,7 +714,7 @@ multi_t2_fnd:
}
}
spin_unlock(&GlobalMid_Lock);
- read_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
/* 1/8th of sec is more than enough time for them to exit */
msleep(125);
}
@@ -725,12 +737,12 @@ multi_t2_fnd:
if a crazy root user tried to kill cifsd
kernel thread explicitly this might happen) */
/* BB: This shouldn't be necessary, see above */
- read_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp, &server->smb_ses_list) {
ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
ses->server = NULL;
}
- read_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
kfree(server->hostname);
task_to_wake = xchg(&server->tsk, NULL);
@@ -1046,6 +1058,22 @@ cifs_parse_mount_options(char *options, const char *devname,
"long\n");
return 1;
}
+ } else if (strnicmp(data, "srcaddr", 7) == 0) {
+ vol->srcaddr.ss_family = AF_UNSPEC;
+
+ if (!value || !*value) {
+ printk(KERN_WARNING "CIFS: srcaddr value"
+ " not specified.\n");
+ return 1; /* needs_arg; */
+ }
+ i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
+ value, strlen(value));
+ if (i == 0) {
+ printk(KERN_WARNING "CIFS: Could not parse"
+ " srcaddr: %s\n",
+ value);
+ return 1;
+ }
} else if (strnicmp(data, "prefixpath", 10) == 0) {
if (!value || !*value) {
printk(KERN_WARNING
@@ -1325,6 +1353,10 @@ cifs_parse_mount_options(char *options, const char *devname,
"/proc/fs/cifs/LookupCacheEnabled to 0\n");
} else if (strnicmp(data, "fsc", 3) == 0) {
vol->fsc = true;
+ } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
+ vol->mfsymlinks = true;
+ } else if (strnicmp(data, "multiuser", 8) == 0) {
+ vol->multiuser = true;
} else
printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
data);
@@ -1356,6 +1388,13 @@ cifs_parse_mount_options(char *options, const char *devname,
return 1;
}
}
+
+ if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
+ cERROR(1, "Multiuser mounts currently require krb5 "
+ "authentication!");
+ return 1;
+ }
+
if (vol->UNCip == NULL)
vol->UNCip = &vol->UNC[2];
@@ -1374,8 +1413,36 @@ cifs_parse_mount_options(char *options, const char *devname,
return 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.
+ */
+static bool
+srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
+{
+ switch (srcaddr->sa_family) {
+ case AF_UNSPEC:
+ return (rhs->sa_family == AF_UNSPEC);
+ case AF_INET: {
+ struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
+ struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
+ return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
+ }
+ case AF_INET6: {
+ struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
+ struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
+ return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
+ }
+ default:
+ WARN_ON(1);
+ return false; /* don't expect to be here */
+ }
+}
+
+
static bool
-match_address(struct TCP_Server_Info *server, struct sockaddr *addr)
+match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
+ struct sockaddr *srcaddr)
{
struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
@@ -1402,6 +1469,9 @@ match_address(struct TCP_Server_Info *server, struct sockaddr *addr)
break;
}
+ if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
+ return false;
+
return true;
}
@@ -1458,29 +1528,21 @@ cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
{
struct TCP_Server_Info *server;
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
- /*
- * the demux thread can exit on its own while still in CifsNew
- * so don't accept any sockets in that state. Since the
- * tcpStatus never changes back to CifsNew it's safe to check
- * for this without a lock.
- */
- if (server->tcpStatus == CifsNew)
- continue;
-
- if (!match_address(server, addr))
+ if (!match_address(server, addr,
+ (struct sockaddr *)&vol->srcaddr))
continue;
if (!match_security(server, vol))
continue;
++server->srv_count;
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
cFYI(1, "Existing tcp session with server found");
return server;
}
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return NULL;
}
@@ -1489,21 +1551,26 @@ cifs_put_tcp_session(struct TCP_Server_Info *server)
{
struct task_struct *task;
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
if (--server->srv_count > 0) {
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return;
}
list_del_init(&server->tcp_ses_list);
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
spin_lock(&GlobalMid_Lock);
server->tcpStatus = CifsExiting;
spin_unlock(&GlobalMid_Lock);
+ cifs_crypto_shash_release(server);
cifs_fscache_release_client_cookie(server);
+ kfree(server->session_key.response);
+ server->session_key.response = NULL;
+ server->session_key.len = 0;
+
task = xchg(&server->tsk, NULL);
if (task)
force_sig(SIGKILL, task);
@@ -1556,10 +1623,16 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
goto out_err;
}
+ rc = cifs_crypto_shash_allocate(tcp_ses);
+ if (rc) {
+ cERROR(1, "could not setup hash structures rc %d", rc);
+ goto out_err;
+ }
+
tcp_ses->hostname = extract_hostname(volume_info->UNC);
if (IS_ERR(tcp_ses->hostname)) {
rc = PTR_ERR(tcp_ses->hostname);
- goto out_err;
+ goto out_err_crypto_release;
}
tcp_ses->noblocksnd = volume_info->noblocksnd;
@@ -1574,6 +1647,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
memcpy(tcp_ses->server_RFC1001_name,
volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
+ tcp_ses->session_estab = false;
tcp_ses->sequence_number = 0;
INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
@@ -1584,6 +1658,8 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
* no need to spinlock this init of tcpStatus or srv_count
*/
tcp_ses->tcpStatus = CifsNew;
+ memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
+ sizeof(tcp_ses->srcaddr));
++tcp_ses->srv_count;
if (addr.ss_family == AF_INET6) {
@@ -1600,7 +1676,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
}
if (rc < 0) {
cERROR(1, "Error connecting to socket. Aborting operation");
- goto out_err;
+ goto out_err_crypto_release;
}
/*
@@ -1614,18 +1690,21 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
rc = PTR_ERR(tcp_ses->tsk);
cERROR(1, "error %d create cifsd thread", rc);
module_put(THIS_MODULE);
- goto out_err;
+ goto out_err_crypto_release;
}
/* thread spawned, put it on the list */
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
cifs_fscache_get_client_cookie(tcp_ses);
return tcp_ses;
+out_err_crypto_release:
+ cifs_crypto_shash_release(tcp_ses);
+
out_err:
if (tcp_ses) {
if (!IS_ERR(tcp_ses->hostname))
@@ -1642,7 +1721,7 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
{
struct cifsSesInfo *ses;
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
switch (server->secType) {
case Kerberos:
@@ -1662,10 +1741,10 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
continue;
}
++ses->ses_count;
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return ses;
}
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return NULL;
}
@@ -1676,14 +1755,14 @@ cifs_put_smb_ses(struct cifsSesInfo *ses)
struct TCP_Server_Info *server = ses->server;
cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
if (--ses->ses_count > 0) {
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return;
}
list_del_init(&ses->smb_ses_list);
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
if (ses->status == CifsGood) {
xid = GetXid();
@@ -1760,10 +1839,9 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
goto get_ses_fail;
}
if (volume_info->domainname) {
- int len = strlen(volume_info->domainname);
- ses->domainName = kmalloc(len + 1, GFP_KERNEL);
- if (ses->domainName)
- strcpy(ses->domainName, volume_info->domainname);
+ ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
+ if (!ses->domainName)
+ goto get_ses_fail;
}
ses->cred_uid = volume_info->cred_uid;
ses->linux_uid = volume_info->linux_uid;
@@ -1778,9 +1856,9 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
goto get_ses_fail;
/* success, put it on the list */
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_add(&ses->smb_ses_list, &server->smb_ses_list);
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
FreeXid(xid);
return ses;
@@ -1797,7 +1875,7 @@ cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
struct list_head *tmp;
struct cifsTconInfo *tcon;
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp, &ses->tcon_list) {
tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
if (tcon->tidStatus == CifsExiting)
@@ -1806,10 +1884,10 @@ cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
continue;
++tcon->tc_count;
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return tcon;
}
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return NULL;
}
@@ -1820,14 +1898,14 @@ cifs_put_tcon(struct cifsTconInfo *tcon)
struct cifsSesInfo *ses = tcon->ses;
cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
if (--tcon->tc_count > 0) {
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return;
}
list_del_init(&tcon->tcon_list);
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
xid = GetXid();
CIFSSMBTDis(xid, tcon);
@@ -1900,9 +1978,9 @@ cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
tcon->nocase = volume_info->nocase;
tcon->local_lease = volume_info->local_lease;
- write_lock(&cifs_tcp_ses_lock);
+ spin_lock(&cifs_tcp_ses_lock);
list_add(&tcon->tcon_list, &ses->tcon_list);
- write_unlock(&cifs_tcp_ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
cifs_fscache_get_super_cookie(tcon);
@@ -1913,6 +1991,23 @@ out_fail:
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;
+}
int
get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
@@ -1997,6 +2092,33 @@ static void rfc1002mangle(char *target, char *source, unsigned int length)
}
+static int
+bind_socket(struct TCP_Server_Info *server)
+{
+ int rc = 0;
+ if (server->srcaddr.ss_family != AF_UNSPEC) {
+ /* Bind to the specified local IP address */
+ struct socket *socket = server->ssocket;
+ rc = socket->ops->bind(socket,
+ (struct sockaddr *) &server->srcaddr,
+ sizeof(server->srcaddr));
+ if (rc < 0) {
+ struct sockaddr_in *saddr4;
+ struct sockaddr_in6 *saddr6;
+ saddr4 = (struct sockaddr_in *)&server->srcaddr;
+ saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
+ if (saddr6->sin6_family == AF_INET6)
+ cERROR(1, "cifs: "
+ "Failed to bind to: %pI6c, error: %d\n",
+ &saddr6->sin6_addr, rc);
+ else
+ cERROR(1, "cifs: "
+ "Failed to bind to: %pI4, error: %d\n",
+ &saddr4->sin_addr.s_addr, rc);
+ }
+ }
+ return rc;
+}
static int
ipv4_connect(struct TCP_Server_Info *server)
@@ -2022,6 +2144,10 @@ ipv4_connect(struct TCP_Server_Info *server)
cifs_reclassify_socket4(socket);
}
+ rc = bind_socket(server);
+ if (rc < 0)
+ return rc;
+
/* user overrode default port */
if (server->addr.sockAddr.sin_port) {
rc = socket->ops->connect(socket, (struct sockaddr *)
@@ -2184,6 +2310,10 @@ ipv6_connect(struct TCP_Server_Info *server)
cifs_reclassify_socket6(socket);
}
+ rc = bind_socket(server);
+ if (rc < 0)
+ return rc;
+
/* user overrode default port */
if (server->addr.sockAddr6.sin6_port) {
rc = socket->ops->connect(socket,
@@ -2383,6 +2513,8 @@ convert_delimiter(char *path, char delim)
static void setup_cifs_sb(struct smb_vol *pvolume_info,
struct cifs_sb_info *cifs_sb)
{
+ INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
+
if (pvolume_info->rsize > CIFSMaxBufSize) {
cERROR(1, "rsize %d too large, using MaxBufSize",
pvolume_info->rsize);
@@ -2462,10 +2594,21 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info,
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
if (pvolume_info->fsc)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
+ if (pvolume_info->multiuser)
+ cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
+ CIFS_MOUNT_NO_PERM);
if (pvolume_info->direct_io) {
cFYI(1, "mounting share using direct i/o");
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
}
+ if (pvolume_info->mfsymlinks) {
+ if (pvolume_info->sfu_emul) {
+ cERROR(1, "mount option mfsymlinks ignored if sfu "
+ "mount option is used");
+ } else {
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
+ }
+ }
if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
cERROR(1, "mount option dynperm ignored if cifsacl "
@@ -2552,6 +2695,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
struct TCP_Server_Info *srvTcp;
char *full_path;
char *mount_data = mount_data_global;
+ struct tcon_link *tlink;
#ifdef CONFIG_CIFS_DFS_UPCALL
struct dfs_info3_param *referrals = NULL;
unsigned int num_referrals = 0;
@@ -2563,6 +2707,7 @@ try_mount_again:
pSesInfo = NULL;
srvTcp = NULL;
full_path = NULL;
+ tlink = NULL;
xid = GetXid();
@@ -2638,8 +2783,6 @@ try_mount_again:
goto remote_path_check;
}
- cifs_sb->tcon = tcon;
-
/* do not care if following two calls succeed - informational */
if (!tcon->ipc) {
CIFSSMBQFSDeviceInfo(xid, tcon);
@@ -2748,6 +2891,30 @@ remote_path_check:
#endif
}
+ if (rc)
+ goto mount_fail_check;
+
+ /* now, hang the tcon off of the superblock */
+ tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
+ if (tlink == NULL) {
+ rc = -ENOMEM;
+ goto mount_fail_check;
+ }
+
+ tlink->tl_uid = pSesInfo->linux_uid;
+ tlink->tl_tcon = tcon;
+ tlink->tl_time = jiffies;
+ set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
+ set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
+
+ cifs_sb->master_tlink = tlink;
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+
+ queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
+ TLINK_IDLE_EXPIRE);
+
mount_fail_check:
/* on error free sesinfo and tcon struct if needed */
if (rc) {
@@ -2825,14 +2992,13 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
#ifdef CONFIG_CIFS_WEAK_PW_HASH
if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
(ses->server->secType == LANMAN))
- calc_lanman_hash(tcon->password, ses->server->cryptKey,
+ calc_lanman_hash(tcon->password, ses->server->cryptkey,
ses->server->secMode &
SECMODE_PW_ENCRYPT ? true : false,
bcc_ptr);
else
#endif /* CIFS_WEAK_PW_HASH */
- SMBNTencrypt(tcon->password, ses->server->cryptKey,
- bcc_ptr);
+ SMBNTencrypt(tcon->password, ses->server->cryptkey, bcc_ptr);
bcc_ptr += CIFS_SESS_KEY_SIZE;
if (ses->capabilities & CAP_UNICODE) {
@@ -2934,19 +3100,32 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
int
cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
{
- int rc = 0;
+ struct rb_root *root = &cifs_sb->tlink_tree;
+ struct rb_node *node;
+ struct tcon_link *tlink;
char *tmp;
- if (cifs_sb->tcon)
- cifs_put_tcon(cifs_sb->tcon);
+ 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);
- cifs_sb->tcon = NULL;
tmp = cifs_sb->prepath;
cifs_sb->prepathlen = 0;
cifs_sb->prepath = NULL;
kfree(tmp);
- return rc;
+ return 0;
}
int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
@@ -2997,6 +3176,16 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
if (rc) {
cERROR(1, "Send error in SessSetup = %d", rc);
} else {
+ mutex_lock(&ses->server->srv_mutex);
+ if (!server->session_estab) {
+ server->session_key.response = ses->auth_key.response;
+ server->session_key.len = ses->auth_key.len;
+ server->sequence_number = 0x2;
+ server->session_estab = true;
+ ses->auth_key.response = NULL;
+ }
+ mutex_unlock(&server->srv_mutex);
+
cFYI(1, "CIFS Session Established successfully");
spin_lock(&GlobalMid_Lock);
ses->status = CifsGood;
@@ -3004,6 +3193,263 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
spin_unlock(&GlobalMid_Lock);
}
+ kfree(ses->auth_key.response);
+ ses->auth_key.response = NULL;
+ ses->auth_key.len = 0;
+ kfree(ses->ntlmssp);
+ ses->ntlmssp = NULL;
+
return rc;
}
+static struct cifsTconInfo *
+cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
+{
+ struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
+ struct cifsSesInfo *ses;
+ struct cifsTconInfo *tcon = NULL;
+ struct smb_vol *vol_info;
+ char username[MAX_USERNAME_SIZE + 1];
+
+ vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
+ if (vol_info == NULL) {
+ tcon = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
+ vol_info->username = username;
+ vol_info->local_nls = cifs_sb->local_nls;
+ vol_info->linux_uid = fsuid;
+ vol_info->cred_uid = fsuid;
+ vol_info->UNC = master_tcon->treeName;
+ vol_info->retry = master_tcon->retry;
+ vol_info->nocase = master_tcon->nocase;
+ vol_info->local_lease = master_tcon->local_lease;
+ vol_info->no_linux_ext = !master_tcon->unix_ext;
+
+ /* FIXME: allow for other secFlg settings */
+ vol_info->secFlg = CIFSSEC_MUST_KRB5;
+
+ /* get a reference for the same TCP session */
+ spin_lock(&cifs_tcp_ses_lock);
+ ++master_tcon->ses->server->srv_count;
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
+ if (IS_ERR(ses)) {
+ tcon = (struct cifsTconInfo *)ses;
+ cifs_put_tcp_session(master_tcon->ses->server);
+ goto out;
+ }
+
+ tcon = cifs_get_tcon(ses, vol_info);
+ if (IS_ERR(tcon)) {
+ cifs_put_smb_ses(ses);
+ goto out;
+ }
+
+ if (ses->capabilities & CAP_UNIX)
+ reset_cifs_unix_caps(0, tcon, NULL, vol_info);
+out:
+ kfree(vol_info);
+
+ return tcon;
+}
+
+static inline struct tcon_link *
+cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
+{
+ return cifs_sb->master_tlink;
+}
+
+struct cifsTconInfo *
+cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
+{
+ return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
+}
+
+static int
+cifs_sb_tcon_pending_wait(void *unused)
+{
+ schedule();
+ return signal_pending(current) ? -ERESTARTSYS : 0;
+}
+
+/* find and return a tlink with given uid */
+static struct tcon_link *
+tlink_rb_search(struct rb_root *root, uid_t uid)
+{
+ struct rb_node *node = root->rb_node;
+ struct tcon_link *tlink;
+
+ while (node) {
+ tlink = rb_entry(node, struct tcon_link, tl_rbnode);
+
+ if (tlink->tl_uid > uid)
+ node = node->rb_left;
+ else if (tlink->tl_uid < uid)
+ node = node->rb_right;
+ else
+ return tlink;
+ }
+ return NULL;
+}
+
+/* insert a tcon_link into the tree */
+static void
+tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
+{
+ struct rb_node **new = &(root->rb_node), *parent = NULL;
+ struct tcon_link *tlink;
+
+ while (*new) {
+ tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
+ parent = *new;
+
+ if (tlink->tl_uid > new_tlink->tl_uid)
+ new = &((*new)->rb_left);
+ else
+ new = &((*new)->rb_right);
+ }
+
+ rb_link_node(&new_tlink->tl_rbnode, parent, new);
+ rb_insert_color(&new_tlink->tl_rbnode, root);
+}
+
+/*
+ * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
+ * current task.
+ *
+ * If the superblock doesn't refer to a multiuser mount, then just return
+ * the master tcon for the mount.
+ *
+ * First, search the rbtree for an existing tcon for this fsuid. If one
+ * exists, then check to see if it's pending construction. If it is then wait
+ * for construction to complete. Once it's no longer pending, check to see if
+ * it failed and either return an error or retry construction, depending on
+ * the timeout.
+ *
+ * If one doesn't exist then insert a new tcon_link struct into the tree and
+ * try to construct a new one.
+ */
+struct tcon_link *
+cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
+{
+ int ret;
+ uid_t fsuid = current_fsuid();
+ struct tcon_link *tlink, *newtlink;
+
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
+ return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
+
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
+ if (tlink)
+ cifs_get_tlink(tlink);
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+
+ if (tlink == NULL) {
+ newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
+ if (newtlink == NULL)
+ return ERR_PTR(-ENOMEM);
+ newtlink->tl_uid = fsuid;
+ newtlink->tl_tcon = ERR_PTR(-EACCES);
+ set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
+ set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
+ cifs_get_tlink(newtlink);
+
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ /* was one inserted after previous search? */
+ tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
+ if (tlink) {
+ cifs_get_tlink(tlink);
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+ kfree(newtlink);
+ goto wait_for_construction;
+ }
+ tlink = newtlink;
+ tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+ } else {
+wait_for_construction:
+ ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
+ cifs_sb_tcon_pending_wait,
+ TASK_INTERRUPTIBLE);
+ if (ret) {
+ cifs_put_tlink(tlink);
+ return ERR_PTR(ret);
+ }
+
+ /* if it's good, return it */
+ if (!IS_ERR(tlink->tl_tcon))
+ return tlink;
+
+ /* return error if we tried this already recently */
+ if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
+ cifs_put_tlink(tlink);
+ return ERR_PTR(-EACCES);
+ }
+
+ if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
+ goto wait_for_construction;
+ }
+
+ tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
+ clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
+ wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
+
+ if (IS_ERR(tlink->tl_tcon)) {
+ cifs_put_tlink(tlink);
+ return ERR_PTR(-EACCES);
+ }
+
+ return tlink;
+}
+
+/*
+ * periodic workqueue job that scans tcon_tree for a superblock and closes
+ * out tcons.
+ */
+static void
+cifs_prune_tlinks(struct work_struct *work)
+{
+ struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
+ prune_tlinks.work);
+ struct rb_root *root = &cifs_sb->tlink_tree;
+ struct rb_node *node = rb_first(root);
+ struct rb_node *tmp;
+ struct tcon_link *tlink;
+
+ /*
+ * Because we drop the spinlock in the loop in order to put the tlink
+ * it's not guarded against removal of links from the tree. The only
+ * places that remove entries from the tree are this function and
+ * umounts. Because this function is non-reentrant and is canceled
+ * before umount can proceed, this is safe.
+ */
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ node = rb_first(root);
+ while (node != NULL) {
+ tmp = node;
+ node = rb_next(tmp);
+ tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
+
+ if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
+ atomic_read(&tlink->tl_count) != 0 ||
+ time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
+ continue;
+
+ cifs_get_tlink(tlink);
+ clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
+ rb_erase(tmp, root);
+
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+ cifs_put_tlink(tlink);
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ }
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+
+ queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
+ TLINK_IDLE_EXPIRE);
+}
generated by cgit v1.1 at 2024-12-27 16:55:18 +0000