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Diffstat (limited to 'fs/cifs/smb2ops.c')
-rw-r--r--fs/cifs/smb2ops.c204
1 files changed, 204 insertions, 0 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index cfacf2c97e94..fb2934b9b97c 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -426,6 +426,194 @@ smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
return rc;
}
+static ssize_t
+move_smb2_ea_to_cifs(char *dst, size_t dst_size,
+ struct smb2_file_full_ea_info *src, size_t src_size,
+ const unsigned char *ea_name)
+{
+ int rc = 0;
+ unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
+ char *name, *value;
+ size_t name_len, value_len, user_name_len;
+
+ while (src_size > 0) {
+ name = &src->ea_data[0];
+ name_len = (size_t)src->ea_name_length;
+ value = &src->ea_data[src->ea_name_length + 1];
+ value_len = (size_t)le16_to_cpu(src->ea_value_length);
+
+ if (name_len == 0) {
+ break;
+ }
+
+ if (src_size < 8 + name_len + 1 + value_len) {
+ cifs_dbg(FYI, "EA entry goes beyond length of list\n");
+ rc = -EIO;
+ goto out;
+ }
+
+ if (ea_name) {
+ if (ea_name_len == name_len &&
+ memcmp(ea_name, name, name_len) == 0) {
+ rc = value_len;
+ if (dst_size == 0)
+ goto out;
+ if (dst_size < value_len) {
+ rc = -ERANGE;
+ goto out;
+ }
+ memcpy(dst, value, value_len);
+ goto out;
+ }
+ } else {
+ /* 'user.' plus a terminating null */
+ user_name_len = 5 + 1 + name_len;
+
+ rc += user_name_len;
+
+ if (dst_size >= user_name_len) {
+ dst_size -= user_name_len;
+ memcpy(dst, "user.", 5);
+ dst += 5;
+ memcpy(dst, src->ea_data, name_len);
+ dst += name_len;
+ *dst = 0;
+ ++dst;
+ } else if (dst_size == 0) {
+ /* skip copy - calc size only */
+ } else {
+ /* stop before overrun buffer */
+ rc = -ERANGE;
+ break;
+ }
+ }
+
+ if (!src->next_entry_offset)
+ break;
+
+ if (src_size < le32_to_cpu(src->next_entry_offset)) {
+ /* stop before overrun buffer */
+ rc = -ERANGE;
+ break;
+ }
+ src_size -= le32_to_cpu(src->next_entry_offset);
+ src = (void *)((char *)src +
+ le32_to_cpu(src->next_entry_offset));
+ }
+
+ /* didn't find the named attribute */
+ if (ea_name)
+ rc = -ENODATA;
+
+out:
+ return (ssize_t)rc;
+}
+
+static ssize_t
+smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
+ const unsigned char *path, const unsigned char *ea_name,
+ char *ea_data, size_t buf_size,
+ struct cifs_sb_info *cifs_sb)
+{
+ int rc;
+ __le16 *utf16_path;
+ __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+ struct cifs_open_parms oparms;
+ struct cifs_fid fid;
+ struct smb2_file_full_ea_info *smb2_data;
+
+ utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+ if (!utf16_path)
+ return -ENOMEM;
+
+ oparms.tcon = tcon;
+ oparms.desired_access = FILE_READ_EA;
+ oparms.disposition = FILE_OPEN;
+ oparms.create_options = 0;
+ oparms.fid = &fid;
+ oparms.reconnect = false;
+
+ rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+ kfree(utf16_path);
+ if (rc) {
+ cifs_dbg(FYI, "open failed rc=%d\n", rc);
+ return rc;
+ }
+
+ smb2_data = kzalloc(SMB2_MAX_EA_BUF, GFP_KERNEL);
+ if (smb2_data == NULL) {
+ SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+ return -ENOMEM;
+ }
+
+ rc = SMB2_query_eas(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+ smb2_data);
+ SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+
+ if (!rc)
+ rc = move_smb2_ea_to_cifs(ea_data, buf_size, smb2_data,
+ SMB2_MAX_EA_BUF, ea_name);
+
+ kfree(smb2_data);
+ return rc;
+}
+
+
+static int
+smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
+ const char *path, const char *ea_name, const void *ea_value,
+ const __u16 ea_value_len, const struct nls_table *nls_codepage,
+ struct cifs_sb_info *cifs_sb)
+{
+ int rc;
+ __le16 *utf16_path;
+ __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+ struct cifs_open_parms oparms;
+ struct cifs_fid fid;
+ struct smb2_file_full_ea_info *ea;
+ int ea_name_len = strlen(ea_name);
+ int len;
+
+ if (ea_name_len > 255)
+ return -EINVAL;
+
+ utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+ if (!utf16_path)
+ return -ENOMEM;
+
+ oparms.tcon = tcon;
+ oparms.desired_access = FILE_WRITE_EA;
+ oparms.disposition = FILE_OPEN;
+ oparms.create_options = 0;
+ oparms.fid = &fid;
+ oparms.reconnect = false;
+
+ rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+ kfree(utf16_path);
+ if (rc) {
+ cifs_dbg(FYI, "open failed rc=%d\n", rc);
+ return rc;
+ }
+
+ len = sizeof(ea) + ea_name_len + ea_value_len + 1;
+ ea = kzalloc(len, GFP_KERNEL);
+ if (ea == NULL) {
+ SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+ return -ENOMEM;
+ }
+
+ ea->ea_name_length = ea_name_len;
+ ea->ea_value_length = cpu_to_le16(ea_value_len);
+ memcpy(ea->ea_data, ea_name, ea_name_len + 1);
+ memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
+
+ rc = SMB2_set_ea(xid, tcon, fid.persistent_fid, fid.volatile_fid, ea,
+ len);
+ SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+
+ return rc;
+}
+
static bool
smb2_can_echo(struct TCP_Server_Info *server)
{
@@ -2572,6 +2760,10 @@ struct smb_version_operations smb20_operations = {
.dir_needs_close = smb2_dir_needs_close,
.get_dfs_refer = smb2_get_dfs_refer,
.select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_XATTR
+ .query_all_EAs = smb2_query_eas,
+ .set_EA = smb2_set_ea,
+#endif /* CIFS_XATTR */
#ifdef CONFIG_CIFS_ACL
.get_acl = get_smb2_acl,
.get_acl_by_fid = get_smb2_acl_by_fid,
@@ -2662,6 +2854,10 @@ struct smb_version_operations smb21_operations = {
.enum_snapshots = smb3_enum_snapshots,
.get_dfs_refer = smb2_get_dfs_refer,
.select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_XATTR
+ .query_all_EAs = smb2_query_eas,
+ .set_EA = smb2_set_ea,
+#endif /* CIFS_XATTR */
#ifdef CONFIG_CIFS_ACL
.get_acl = get_smb2_acl,
.get_acl_by_fid = get_smb2_acl_by_fid,
@@ -2762,6 +2958,10 @@ struct smb_version_operations smb30_operations = {
.receive_transform = smb3_receive_transform,
.get_dfs_refer = smb2_get_dfs_refer,
.select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_XATTR
+ .query_all_EAs = smb2_query_eas,
+ .set_EA = smb2_set_ea,
+#endif /* CIFS_XATTR */
#ifdef CONFIG_CIFS_ACL
.get_acl = get_smb2_acl,
.get_acl_by_fid = get_smb2_acl_by_fid,
@@ -2863,6 +3063,10 @@ struct smb_version_operations smb311_operations = {
.receive_transform = smb3_receive_transform,
.get_dfs_refer = smb2_get_dfs_refer,
.select_sectype = smb2_select_sectype,
+#ifdef CONFIG_CIFS_XATTR
+ .query_all_EAs = smb2_query_eas,
+ .set_EA = smb2_set_ea,
+#endif /* CIFS_XATTR */
};
#endif /* CIFS_SMB311 */
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2025-01-10 14:52:42 +0000