392 lines
8.6 KiB
C
392 lines
8.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2018 Samsung Electronics Co., Ltd.
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*/
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/rwsem.h>
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#include <linux/xarray.h>
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#include "ksmbd_ida.h"
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#include "user_session.h"
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#include "user_config.h"
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#include "tree_connect.h"
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#include "../transport_ipc.h"
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#include "../connection.h"
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#include "../vfs_cache.h"
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static DEFINE_IDA(session_ida);
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#define SESSION_HASH_BITS 3
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static DEFINE_HASHTABLE(sessions_table, SESSION_HASH_BITS);
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static DECLARE_RWSEM(sessions_table_lock);
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struct ksmbd_session_rpc {
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int id;
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unsigned int method;
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};
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static void free_channel_list(struct ksmbd_session *sess)
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{
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struct channel *chann;
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unsigned long index;
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xa_for_each(&sess->ksmbd_chann_list, index, chann) {
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xa_erase(&sess->ksmbd_chann_list, index);
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kfree(chann);
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}
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xa_destroy(&sess->ksmbd_chann_list);
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}
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static void __session_rpc_close(struct ksmbd_session *sess,
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struct ksmbd_session_rpc *entry)
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{
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struct ksmbd_rpc_command *resp;
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resp = ksmbd_rpc_close(sess, entry->id);
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if (!resp)
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pr_err("Unable to close RPC pipe %d\n", entry->id);
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kvfree(resp);
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ksmbd_rpc_id_free(entry->id);
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kfree(entry);
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}
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static void ksmbd_session_rpc_clear_list(struct ksmbd_session *sess)
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{
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struct ksmbd_session_rpc *entry;
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long index;
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xa_for_each(&sess->rpc_handle_list, index, entry) {
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xa_erase(&sess->rpc_handle_list, index);
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__session_rpc_close(sess, entry);
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}
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xa_destroy(&sess->rpc_handle_list);
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}
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static int __rpc_method(char *rpc_name)
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{
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if (!strcmp(rpc_name, "\\srvsvc") || !strcmp(rpc_name, "srvsvc"))
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return KSMBD_RPC_SRVSVC_METHOD_INVOKE;
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if (!strcmp(rpc_name, "\\wkssvc") || !strcmp(rpc_name, "wkssvc"))
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return KSMBD_RPC_WKSSVC_METHOD_INVOKE;
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if (!strcmp(rpc_name, "LANMAN") || !strcmp(rpc_name, "lanman"))
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return KSMBD_RPC_RAP_METHOD;
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if (!strcmp(rpc_name, "\\samr") || !strcmp(rpc_name, "samr"))
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return KSMBD_RPC_SAMR_METHOD_INVOKE;
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if (!strcmp(rpc_name, "\\lsarpc") || !strcmp(rpc_name, "lsarpc"))
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return KSMBD_RPC_LSARPC_METHOD_INVOKE;
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pr_err("Unsupported RPC: %s\n", rpc_name);
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return 0;
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}
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int ksmbd_session_rpc_open(struct ksmbd_session *sess, char *rpc_name)
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{
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struct ksmbd_session_rpc *entry;
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struct ksmbd_rpc_command *resp;
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int method;
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method = __rpc_method(rpc_name);
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if (!method)
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return -EINVAL;
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entry = kzalloc(sizeof(struct ksmbd_session_rpc), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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entry->method = method;
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entry->id = ksmbd_ipc_id_alloc();
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if (entry->id < 0)
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goto free_entry;
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xa_store(&sess->rpc_handle_list, entry->id, entry, GFP_KERNEL);
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resp = ksmbd_rpc_open(sess, entry->id);
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if (!resp)
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goto free_id;
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kvfree(resp);
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return entry->id;
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free_id:
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xa_erase(&sess->rpc_handle_list, entry->id);
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ksmbd_rpc_id_free(entry->id);
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free_entry:
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kfree(entry);
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return -EINVAL;
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}
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void ksmbd_session_rpc_close(struct ksmbd_session *sess, int id)
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{
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struct ksmbd_session_rpc *entry;
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entry = xa_erase(&sess->rpc_handle_list, id);
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if (entry)
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__session_rpc_close(sess, entry);
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}
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int ksmbd_session_rpc_method(struct ksmbd_session *sess, int id)
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{
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struct ksmbd_session_rpc *entry;
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entry = xa_load(&sess->rpc_handle_list, id);
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return entry ? entry->method : 0;
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}
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void ksmbd_session_destroy(struct ksmbd_session *sess)
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{
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if (!sess)
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return;
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if (sess->user)
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ksmbd_free_user(sess->user);
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ksmbd_tree_conn_session_logoff(sess);
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ksmbd_destroy_file_table(&sess->file_table);
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ksmbd_session_rpc_clear_list(sess);
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free_channel_list(sess);
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kfree(sess->Preauth_HashValue);
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ksmbd_release_id(&session_ida, sess->id);
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kfree(sess);
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}
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static struct ksmbd_session *__session_lookup(unsigned long long id)
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{
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struct ksmbd_session *sess;
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hash_for_each_possible(sessions_table, sess, hlist, id) {
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if (id == sess->id) {
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sess->last_active = jiffies;
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return sess;
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}
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}
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return NULL;
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}
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static void ksmbd_expire_session(struct ksmbd_conn *conn)
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{
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unsigned long id;
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struct ksmbd_session *sess;
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down_write(&sessions_table_lock);
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xa_for_each(&conn->sessions, id, sess) {
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if (sess->state != SMB2_SESSION_VALID ||
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time_after(jiffies,
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sess->last_active + SMB2_SESSION_TIMEOUT)) {
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xa_erase(&conn->sessions, sess->id);
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hash_del(&sess->hlist);
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ksmbd_session_destroy(sess);
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continue;
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}
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}
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up_write(&sessions_table_lock);
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}
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int ksmbd_session_register(struct ksmbd_conn *conn,
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struct ksmbd_session *sess)
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{
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sess->dialect = conn->dialect;
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memcpy(sess->ClientGUID, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);
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ksmbd_expire_session(conn);
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return xa_err(xa_store(&conn->sessions, sess->id, sess, GFP_KERNEL));
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}
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static int ksmbd_chann_del(struct ksmbd_conn *conn, struct ksmbd_session *sess)
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{
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struct channel *chann;
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chann = xa_erase(&sess->ksmbd_chann_list, (long)conn);
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if (!chann)
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return -ENOENT;
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kfree(chann);
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return 0;
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}
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void ksmbd_sessions_deregister(struct ksmbd_conn *conn)
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{
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struct ksmbd_session *sess;
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unsigned long id;
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down_write(&sessions_table_lock);
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if (conn->binding) {
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int bkt;
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struct hlist_node *tmp;
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hash_for_each_safe(sessions_table, bkt, tmp, sess, hlist) {
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if (!ksmbd_chann_del(conn, sess) &&
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xa_empty(&sess->ksmbd_chann_list)) {
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hash_del(&sess->hlist);
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ksmbd_session_destroy(sess);
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}
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}
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}
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xa_for_each(&conn->sessions, id, sess) {
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unsigned long chann_id;
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struct channel *chann;
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xa_for_each(&sess->ksmbd_chann_list, chann_id, chann) {
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if (chann->conn != conn)
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ksmbd_conn_set_exiting(chann->conn);
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}
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ksmbd_chann_del(conn, sess);
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if (xa_empty(&sess->ksmbd_chann_list)) {
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xa_erase(&conn->sessions, sess->id);
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hash_del(&sess->hlist);
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ksmbd_session_destroy(sess);
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}
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}
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up_write(&sessions_table_lock);
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}
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struct ksmbd_session *ksmbd_session_lookup(struct ksmbd_conn *conn,
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unsigned long long id)
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{
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struct ksmbd_session *sess;
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sess = xa_load(&conn->sessions, id);
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if (sess)
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sess->last_active = jiffies;
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return sess;
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}
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struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id)
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{
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struct ksmbd_session *sess;
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down_read(&sessions_table_lock);
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sess = __session_lookup(id);
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if (sess)
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sess->last_active = jiffies;
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up_read(&sessions_table_lock);
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return sess;
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}
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struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn,
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unsigned long long id)
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{
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struct ksmbd_session *sess;
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sess = ksmbd_session_lookup(conn, id);
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if (!sess && conn->binding)
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sess = ksmbd_session_lookup_slowpath(id);
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if (sess && sess->state != SMB2_SESSION_VALID)
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sess = NULL;
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return sess;
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}
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struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn,
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u64 sess_id)
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{
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struct preauth_session *sess;
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sess = kmalloc(sizeof(struct preauth_session), GFP_KERNEL);
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if (!sess)
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return NULL;
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sess->id = sess_id;
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memcpy(sess->Preauth_HashValue, conn->preauth_info->Preauth_HashValue,
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PREAUTH_HASHVALUE_SIZE);
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list_add(&sess->preauth_entry, &conn->preauth_sess_table);
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return sess;
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}
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static bool ksmbd_preauth_session_id_match(struct preauth_session *sess,
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unsigned long long id)
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{
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return sess->id == id;
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}
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struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn,
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unsigned long long id)
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{
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struct preauth_session *sess = NULL;
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list_for_each_entry(sess, &conn->preauth_sess_table, preauth_entry) {
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if (ksmbd_preauth_session_id_match(sess, id))
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return sess;
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}
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return NULL;
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}
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static int __init_smb2_session(struct ksmbd_session *sess)
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{
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int id = ksmbd_acquire_smb2_uid(&session_ida);
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if (id < 0)
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return -EINVAL;
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sess->id = id;
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return 0;
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}
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static struct ksmbd_session *__session_create(int protocol)
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{
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struct ksmbd_session *sess;
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int ret;
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if (protocol != CIFDS_SESSION_FLAG_SMB2)
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return NULL;
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sess = kzalloc(sizeof(struct ksmbd_session), GFP_KERNEL);
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if (!sess)
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return NULL;
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if (ksmbd_init_file_table(&sess->file_table))
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goto error;
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sess->last_active = jiffies;
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sess->state = SMB2_SESSION_IN_PROGRESS;
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set_session_flag(sess, protocol);
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xa_init(&sess->tree_conns);
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xa_init(&sess->ksmbd_chann_list);
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xa_init(&sess->rpc_handle_list);
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sess->sequence_number = 1;
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ret = __init_smb2_session(sess);
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if (ret)
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goto error;
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ida_init(&sess->tree_conn_ida);
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down_write(&sessions_table_lock);
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hash_add(sessions_table, &sess->hlist, sess->id);
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up_write(&sessions_table_lock);
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return sess;
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error:
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ksmbd_session_destroy(sess);
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return NULL;
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}
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struct ksmbd_session *ksmbd_smb2_session_create(void)
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{
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return __session_create(CIFDS_SESSION_FLAG_SMB2);
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}
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int ksmbd_acquire_tree_conn_id(struct ksmbd_session *sess)
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{
|
||
|
|
int id = -EINVAL;
|
||
|
|
|
||
|
|
if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
|
||
|
|
id = ksmbd_acquire_smb2_tid(&sess->tree_conn_ida);
|
||
|
|
|
||
|
|
return id;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id)
|
||
|
|
{
|
||
|
|
if (id >= 0)
|
||
|
|
ksmbd_release_id(&sess->tree_conn_ida, id);
|
||
|
|
}
|