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Diffstat (limited to 'fs/cifs/connect.c')
-rw-r--r--fs/cifs/connect.c150
1 files changed, 113 insertions, 37 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 63c5d85fe25e..8b5e401f547a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -354,11 +354,12 @@ cifs_reconnect(struct TCP_Server_Info *server)
list_for_each(tmp, &server->smb_ses_list) {
ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
ses->need_reconnect = true;
- ses->ipc_tid = 0;
list_for_each(tmp2, &ses->tcon_list) {
tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
tcon->need_reconnect = true;
}
+ if (ses->tcon_ipc)
+ ses->tcon_ipc->need_reconnect = true;
}
spin_unlock(&cifs_tcp_ses_lock);
@@ -2426,6 +2427,93 @@ static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
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 smb_vol *volume_info)
+{
+ int rc = 0, xid;
+ struct cifs_tcon *tcon;
+ struct nls_table *nls_codepage;
+ char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
+ bool seal = false;
+
+ /*
+ * If the mount request that resulted in the creation of the
+ * session requires encryption, force IPC to be encrypted too.
+ */
+ if (volume_info->seal) {
+ if (ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
+ seal = true;
+ else {
+ cifs_dbg(VFS,
+ "IPC: server doesn't support encryption\n");
+ return -EOPNOTSUPP;
+ }
+ }
+
+ tcon = tconInfoAlloc();
+ if (tcon == NULL)
+ return -ENOMEM;
+
+ snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->serverName);
+
+ /* cannot fail */
+ nls_codepage = load_nls_default();
+
+ xid = get_xid();
+ tcon->ses = ses;
+ tcon->ipc = true;
+ tcon->seal = seal;
+ rc = ses->server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
+ free_xid(xid);
+
+ if (rc) {
+ cifs_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:
+ unload_nls(nls_codepage);
+ 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 smb_vol *vol)
{
@@ -2466,6 +2554,8 @@ cifs_put_smb_ses(struct cifs_ses *ses)
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);
@@ -2710,6 +2800,9 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
spin_unlock(&cifs_tcp_ses_lock);
free_xid(xid);
+
+ cifs_setup_ipc(ses, volume_info);
+
return ses;
get_ses_fail:
@@ -2754,8 +2847,16 @@ void
cifs_put_tcon(struct cifs_tcon *tcon)
{
unsigned int xid;
- struct cifs_ses *ses = tcon->ses;
+ 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) {
@@ -3031,39 +3132,17 @@ get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
const struct nls_table *nls_codepage, unsigned int *num_referrals,
struct dfs_info3_param **referrals, int remap)
{
- char *temp_unc;
int rc = 0;
- if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
+ if (!ses->server->ops->get_dfs_refer)
return -ENOSYS;
*num_referrals = 0;
*referrals = NULL;
- if (ses->ipc_tid == 0) {
- temp_unc = kmalloc(2 /* for slashes */ +
- strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
- + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
- if (temp_unc == NULL)
- return -ENOMEM;
- temp_unc[0] = '\\';
- temp_unc[1] = '\\';
- strcpy(temp_unc + 2, ses->serverName);
- strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
- rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
- nls_codepage);
- cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
- kfree(temp_unc);
- }
- if (rc == 0)
- rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
- referrals, num_referrals,
- nls_codepage, remap);
- /*
- * BB - map targetUNCs to dfs_info3 structures, here or in
- * ses->server->ops->get_dfs_refer.
- */
-
+ rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
+ referrals, num_referrals,
+ nls_codepage, remap);
return rc;
}
@@ -3828,7 +3907,7 @@ try_mount_again:
tcon->unix_ext = 0; /* server does not support them */
/* do not care if a following call succeed - informational */
- if (!tcon->ipc && server->ops->qfs_tcon)
+ if (!tcon->pipe && server->ops->qfs_tcon)
server->ops->qfs_tcon(xid, tcon);
cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
@@ -3958,8 +4037,7 @@ out:
}
/*
- * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
- * pointer may be NULL.
+ * Issue a TREE_CONNECT request.
*/
int
CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
@@ -3995,7 +4073,7 @@ CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
pSMB->AndXCommand = 0xFF;
pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
bcc_ptr = &pSMB->Password[0];
- if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
+ 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 */
@@ -4067,7 +4145,7 @@ CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
0);
/* above now done in SendReceive */
- if ((rc == 0) && (tcon != NULL)) {
+ if (rc == 0) {
bool is_unicode;
tcon->tidStatus = CifsGood;
@@ -4087,7 +4165,8 @@ CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
(bcc_ptr[2] == 'C')) {
cifs_dbg(FYI, "IPC connection\n");
- tcon->ipc = 1;
+ tcon->ipc = true;
+ tcon->pipe = true;
}
} else if (length == 2) {
if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
@@ -4114,9 +4193,6 @@ CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
else
tcon->Flags = 0;
cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
- } else if ((rc == 0) && tcon == NULL) {
- /* all we need to save for IPC$ connection */
- ses->ipc_tid = smb_buffer_response->Tid;
}
cifs_buf_release(smb_buffer);
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-03 16:00:26 +0000