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authorAurelien Aptel <aaptel@suse.com>2017-02-13 16:03:47 +0100
committerSteve French <smfrench@gmail.com>2017-03-01 22:26:10 -0600
commit4ecce920e13ace16a5ba45efe8909946c28fb2ad (patch)
tree2061bc7cf21e6fb9741e7a30a8623cc2f6f30260 /fs/cifs/cifssmb.c
parent61cfac6f267dabcf2740a7ec8a0295833b28b5f5 (diff)
downloadlinux-4ecce920e13ace16a5ba45efe8909946c28fb2ad.tar.bz2
CIFS: move DFS response parsing out of SMB1 code
since the DFS payload is not tied to the SMB version we can: * isolate the DFS payload in its own struct, and include that struct in packet structs * move the function that parses the response to misc.c and make it work on the new DFS payload struct (add payload size and utf16 flag as a result). Signed-off-by: Aurelien Aptel <aaptel@suse.com> Acked-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r--fs/cifs/cifssmb.c119
1 files changed, 5 insertions, 114 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index f5099fb8a22f..5005c7995b6a 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -4786,117 +4786,6 @@ GetInodeNumOut:
return rc;
}
-/* parses DFS refferal V3 structure
- * caller is responsible for freeing target_nodes
- * returns:
- * on success - 0
- * on failure - errno
- */
-static int
-parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr,
- unsigned int *num_of_nodes,
- struct dfs_info3_param **target_nodes,
- const struct nls_table *nls_codepage, int remap,
- const char *searchName)
-{
- int i, rc = 0;
- char *data_end;
- bool is_unicode;
- struct dfs_referral_level_3 *ref;
-
- if (pSMBr->hdr.Flags2 & SMBFLG2_UNICODE)
- is_unicode = true;
- else
- is_unicode = false;
- *num_of_nodes = le16_to_cpu(pSMBr->NumberOfReferrals);
-
- if (*num_of_nodes < 1) {
- cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
- *num_of_nodes);
- rc = -EINVAL;
- goto parse_DFS_referrals_exit;
- }
-
- ref = (struct dfs_referral_level_3 *) &(pSMBr->referrals);
- if (ref->VersionNumber != cpu_to_le16(3)) {
- cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n",
- le16_to_cpu(ref->VersionNumber));
- rc = -EINVAL;
- goto parse_DFS_referrals_exit;
- }
-
- /* get the upper boundary of the resp buffer */
- data_end = (char *)(&(pSMBr->PathConsumed)) +
- le16_to_cpu(pSMBr->t2.DataCount);
-
- cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n",
- *num_of_nodes, le32_to_cpu(pSMBr->DFSFlags));
-
- *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param),
- GFP_KERNEL);
- if (*target_nodes == NULL) {
- rc = -ENOMEM;
- goto parse_DFS_referrals_exit;
- }
-
- /* collect necessary data from referrals */
- for (i = 0; i < *num_of_nodes; i++) {
- char *temp;
- int max_len;
- struct dfs_info3_param *node = (*target_nodes)+i;
-
- node->flags = le32_to_cpu(pSMBr->DFSFlags);
- if (is_unicode) {
- __le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
- GFP_KERNEL);
- if (tmp == NULL) {
- rc = -ENOMEM;
- goto parse_DFS_referrals_exit;
- }
- cifsConvertToUTF16((__le16 *) tmp, searchName,
- PATH_MAX, nls_codepage, remap);
- node->path_consumed = cifs_utf16_bytes(tmp,
- le16_to_cpu(pSMBr->PathConsumed),
- nls_codepage);
- kfree(tmp);
- } else
- node->path_consumed = le16_to_cpu(pSMBr->PathConsumed);
-
- node->server_type = le16_to_cpu(ref->ServerType);
- node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
-
- /* copy DfsPath */
- temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
- max_len = data_end - temp;
- node->path_name = cifs_strndup_from_utf16(temp, max_len,
- is_unicode, nls_codepage);
- if (!node->path_name) {
- rc = -ENOMEM;
- goto parse_DFS_referrals_exit;
- }
-
- /* copy link target UNC */
- temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
- max_len = data_end - temp;
- node->node_name = cifs_strndup_from_utf16(temp, max_len,
- is_unicode, nls_codepage);
- if (!node->node_name) {
- rc = -ENOMEM;
- goto parse_DFS_referrals_exit;
- }
-
- ref++;
- }
-
-parse_DFS_referrals_exit:
- if (rc) {
- free_dfs_info_array(*target_nodes, *num_of_nodes);
- *target_nodes = NULL;
- *num_of_nodes = 0;
- }
- return rc;
-}
-
int
CIFSGetDFSRefer(const unsigned int xid, struct cifs_ses *ses,
const char *search_name, struct dfs_info3_param **target_nodes,
@@ -4993,9 +4882,11 @@ getDFSRetry:
get_bcc(&pSMBr->hdr), le16_to_cpu(pSMBr->t2.DataOffset));
/* parse returned result into more usable form */
- rc = parse_DFS_referrals(pSMBr, num_of_nodes,
- target_nodes, nls_codepage, remap,
- search_name);
+ rc = parse_dfs_referrals(&pSMBr->dfs_data,
+ le16_to_cpu(pSMBr->t2.DataCount),
+ num_of_nodes, target_nodes, nls_codepage,
+ remap, search_name,
+ pSMBr->hdr.Flags2 & SMBFLG2_UNICODE);
GetDFSRefExit:
cifs_buf_release(pSMB);