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-rw-r--r--fs/smb/server/mgmt/share_config.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/fs/smb/server/mgmt/share_config.c b/fs/smb/server/mgmt/share_config.c
new file mode 100644
index 000000000..328a41225
--- /dev/null
+++ b/fs/smb/server/mgmt/share_config.c
@@ -0,0 +1,234 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/list.h>
+#include <linux/jhash.h>
+#include <linux/slab.h>
+#include <linux/rwsem.h>
+#include <linux/parser.h>
+#include <linux/namei.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+
+#include "share_config.h"
+#include "user_config.h"
+#include "user_session.h"
+#include "../transport_ipc.h"
+#include "../misc.h"
+
+#define SHARE_HASH_BITS 3
+static DEFINE_HASHTABLE(shares_table, SHARE_HASH_BITS);
+static DECLARE_RWSEM(shares_table_lock);
+
+struct ksmbd_veto_pattern {
+ char *pattern;
+ struct list_head list;
+};
+
+static unsigned int share_name_hash(const char *name)
+{
+ return jhash(name, strlen(name), 0);
+}
+
+static void kill_share(struct ksmbd_share_config *share)
+{
+ while (!list_empty(&share->veto_list)) {
+ struct ksmbd_veto_pattern *p;
+
+ p = list_entry(share->veto_list.next,
+ struct ksmbd_veto_pattern,
+ list);
+ list_del(&p->list);
+ kfree(p->pattern);
+ kfree(p);
+ }
+
+ if (share->path)
+ path_put(&share->vfs_path);
+ kfree(share->name);
+ kfree(share->path);
+ kfree(share);
+}
+
+void ksmbd_share_config_del(struct ksmbd_share_config *share)
+{
+ down_write(&shares_table_lock);
+ hash_del(&share->hlist);
+ up_write(&shares_table_lock);
+}
+
+void __ksmbd_share_config_put(struct ksmbd_share_config *share)
+{
+ ksmbd_share_config_del(share);
+ kill_share(share);
+}
+
+static struct ksmbd_share_config *
+__get_share_config(struct ksmbd_share_config *share)
+{
+ if (!atomic_inc_not_zero(&share->refcount))
+ return NULL;
+ return share;
+}
+
+static struct ksmbd_share_config *__share_lookup(const char *name)
+{
+ struct ksmbd_share_config *share;
+ unsigned int key = share_name_hash(name);
+
+ hash_for_each_possible(shares_table, share, hlist, key) {
+ if (!strcmp(name, share->name))
+ return share;
+ }
+ return NULL;
+}
+
+static int parse_veto_list(struct ksmbd_share_config *share,
+ char *veto_list,
+ int veto_list_sz)
+{
+ int sz = 0;
+
+ if (!veto_list_sz)
+ return 0;
+
+ while (veto_list_sz > 0) {
+ struct ksmbd_veto_pattern *p;
+
+ sz = strlen(veto_list);
+ if (!sz)
+ break;
+
+ p = kzalloc(sizeof(struct ksmbd_veto_pattern), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ p->pattern = kstrdup(veto_list, GFP_KERNEL);
+ if (!p->pattern) {
+ kfree(p);
+ return -ENOMEM;
+ }
+
+ list_add(&p->list, &share->veto_list);
+
+ veto_list += sz + 1;
+ veto_list_sz -= (sz + 1);
+ }
+
+ return 0;
+}
+
+static struct ksmbd_share_config *share_config_request(struct unicode_map *um,
+ const char *name)
+{
+ struct ksmbd_share_config_response *resp;
+ struct ksmbd_share_config *share = NULL;
+ struct ksmbd_share_config *lookup;
+ int ret;
+
+ resp = ksmbd_ipc_share_config_request(name);
+ if (!resp)
+ return NULL;
+
+ if (resp->flags == KSMBD_SHARE_FLAG_INVALID)
+ goto out;
+
+ if (*resp->share_name) {
+ char *cf_resp_name;
+ bool equal;
+
+ cf_resp_name = ksmbd_casefold_sharename(um, resp->share_name);
+ if (IS_ERR(cf_resp_name))
+ goto out;
+ equal = !strcmp(cf_resp_name, name);
+ kfree(cf_resp_name);
+ if (!equal)
+ goto out;
+ }
+
+ share = kzalloc(sizeof(struct ksmbd_share_config), GFP_KERNEL);
+ if (!share)
+ goto out;
+
+ share->flags = resp->flags;
+ atomic_set(&share->refcount, 1);
+ INIT_LIST_HEAD(&share->veto_list);
+ share->name = kstrdup(name, GFP_KERNEL);
+
+ if (!test_share_config_flag(share, KSMBD_SHARE_FLAG_PIPE)) {
+ share->path = kstrdup(ksmbd_share_config_path(resp),
+ GFP_KERNEL);
+ if (share->path)
+ share->path_sz = strlen(share->path);
+ share->create_mask = resp->create_mask;
+ share->directory_mask = resp->directory_mask;
+ share->force_create_mode = resp->force_create_mode;
+ share->force_directory_mode = resp->force_directory_mode;
+ share->force_uid = resp->force_uid;
+ share->force_gid = resp->force_gid;
+ ret = parse_veto_list(share,
+ KSMBD_SHARE_CONFIG_VETO_LIST(resp),
+ resp->veto_list_sz);
+ if (!ret && share->path) {
+ ret = kern_path(share->path, 0, &share->vfs_path);
+ if (ret) {
+ ksmbd_debug(SMB, "failed to access '%s'\n",
+ share->path);
+ /* Avoid put_path() */
+ kfree(share->path);
+ share->path = NULL;
+ }
+ }
+ if (ret || !share->name) {
+ kill_share(share);
+ share = NULL;
+ goto out;
+ }
+ }
+
+ down_write(&shares_table_lock);
+ lookup = __share_lookup(name);
+ if (lookup)
+ lookup = __get_share_config(lookup);
+ if (!lookup) {
+ hash_add(shares_table, &share->hlist, share_name_hash(name));
+ } else {
+ kill_share(share);
+ share = lookup;
+ }
+ up_write(&shares_table_lock);
+
+out:
+ kvfree(resp);
+ return share;
+}
+
+struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um,
+ const char *name)
+{
+ struct ksmbd_share_config *share;
+
+ down_read(&shares_table_lock);
+ share = __share_lookup(name);
+ if (share)
+ share = __get_share_config(share);
+ up_read(&shares_table_lock);
+
+ if (share)
+ return share;
+ return share_config_request(um, name);
+}
+
+bool ksmbd_share_veto_filename(struct ksmbd_share_config *share,
+ const char *filename)
+{
+ struct ksmbd_veto_pattern *p;
+
+ list_for_each_entry(p, &share->veto_list, list) {
+ if (match_wildcard(p->pattern, filename))
+ return true;
+ }
+ return false;
+}