2021-03-16 04:07:11 +00:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
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* Copyright (C) 2018 Samsung Electronics Co., Ltd.
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*/
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#include <linux/mutex.h>
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#include <linux/freezer.h>
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#include <linux/module.h>
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#include "server.h"
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#include "smb_common.h"
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#include "mgmt/ksmbd_ida.h"
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#include "connection.h"
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#include "transport_tcp.h"
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#include "transport_rdma.h"
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static DEFINE_MUTEX(init_lock);
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static struct ksmbd_conn_ops default_conn_ops;
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2021-07-10 07:22:41 +00:00
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LIST_HEAD(conn_list);
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DEFINE_RWLOCK(conn_list_lock);
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2021-03-16 04:07:11 +00:00
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/**
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* ksmbd_conn_free() - free resources of the connection instance
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*
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* @conn: connection instance to be cleand up
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*
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* During the thread termination, the corresponding conn instance
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* resources(sock/memory) are released and finally the conn object is freed.
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*/
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void ksmbd_conn_free(struct ksmbd_conn *conn)
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{
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write_lock(&conn_list_lock);
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list_del(&conn->conns_list);
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write_unlock(&conn_list_lock);
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2022-07-22 01:15:10 +00:00
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xa_destroy(&conn->sessions);
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2021-04-02 03:47:14 +00:00
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kvfree(conn->request_buf);
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2021-03-16 04:07:11 +00:00
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kfree(conn->preauth_info);
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kfree(conn);
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}
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/**
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* ksmbd_conn_alloc() - initialize a new connection instance
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*
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* Return: ksmbd_conn struct on success, otherwise NULL
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*/
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struct ksmbd_conn *ksmbd_conn_alloc(void)
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{
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struct ksmbd_conn *conn;
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conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL);
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if (!conn)
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return NULL;
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conn->need_neg = true;
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conn->status = KSMBD_SESS_NEW;
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conn->local_nls = load_nls("utf8");
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if (!conn->local_nls)
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conn->local_nls = load_nls_default();
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2022-09-15 13:49:11 +00:00
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if (IS_ENABLED(CONFIG_UNICODE))
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conn->um = utf8_load(UNICODE_AGE(12, 1, 0));
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else
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conn->um = ERR_PTR(-EOPNOTSUPP);
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if (IS_ERR(conn->um))
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conn->um = NULL;
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2021-03-16 04:07:11 +00:00
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atomic_set(&conn->req_running, 0);
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atomic_set(&conn->r_count, 0);
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2021-10-07 07:26:58 +00:00
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conn->total_credits = 1;
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2022-05-20 05:35:47 +00:00
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conn->outstanding_credits = 0;
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2021-10-07 07:26:58 +00:00
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2021-03-16 04:07:11 +00:00
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init_waitqueue_head(&conn->req_running_q);
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2022-07-28 14:35:18 +00:00
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init_waitqueue_head(&conn->r_count_q);
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2021-03-16 04:07:11 +00:00
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INIT_LIST_HEAD(&conn->conns_list);
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INIT_LIST_HEAD(&conn->requests);
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INIT_LIST_HEAD(&conn->async_requests);
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spin_lock_init(&conn->request_lock);
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spin_lock_init(&conn->credits_lock);
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2021-04-13 04:06:30 +00:00
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ida_init(&conn->async_ida);
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2022-07-22 01:15:10 +00:00
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xa_init(&conn->sessions);
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2021-03-16 04:07:11 +00:00
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2021-07-10 07:22:41 +00:00
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spin_lock_init(&conn->llist_lock);
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INIT_LIST_HEAD(&conn->lock_list);
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2021-03-16 04:07:11 +00:00
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write_lock(&conn_list_lock);
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list_add(&conn->conns_list, &conn_list);
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write_unlock(&conn_list_lock);
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return conn;
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}
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bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
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{
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struct ksmbd_conn *t;
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bool ret = false;
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read_lock(&conn_list_lock);
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list_for_each_entry(t, &conn_list, conns_list) {
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if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
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continue;
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ret = true;
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break;
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}
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read_unlock(&conn_list_lock);
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return ret;
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}
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void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
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{
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struct ksmbd_conn *conn = work->conn;
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struct list_head *requests_queue = NULL;
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if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) {
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requests_queue = &conn->requests;
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2023-01-15 10:32:09 +00:00
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work->synchronous = true;
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2021-03-16 04:07:11 +00:00
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}
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if (requests_queue) {
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atomic_inc(&conn->req_running);
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spin_lock(&conn->request_lock);
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list_add_tail(&work->request_entry, requests_queue);
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spin_unlock(&conn->request_lock);
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}
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}
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int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
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{
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struct ksmbd_conn *conn = work->conn;
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int ret = 1;
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if (list_empty(&work->request_entry) &&
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2021-03-30 05:25:35 +00:00
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list_empty(&work->async_request_entry))
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2021-03-16 04:07:11 +00:00
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return 0;
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2021-07-10 00:31:08 +00:00
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if (!work->multiRsp)
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atomic_dec(&conn->req_running);
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2021-03-16 04:07:11 +00:00
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spin_lock(&conn->request_lock);
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if (!work->multiRsp) {
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list_del_init(&work->request_entry);
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2023-01-15 10:32:09 +00:00
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if (!work->synchronous)
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2021-03-16 04:07:11 +00:00
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list_del_init(&work->async_request_entry);
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ret = 0;
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}
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spin_unlock(&conn->request_lock);
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wake_up_all(&conn->req_running_q);
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return ret;
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}
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static void ksmbd_conn_lock(struct ksmbd_conn *conn)
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{
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mutex_lock(&conn->srv_mutex);
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}
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static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
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{
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mutex_unlock(&conn->srv_mutex);
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}
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void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
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{
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wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
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}
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int ksmbd_conn_write(struct ksmbd_work *work)
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{
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struct ksmbd_conn *conn = work->conn;
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size_t len = 0;
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int sent;
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struct kvec iov[3];
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int iov_idx = 0;
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2021-11-02 23:08:44 +00:00
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if (!work->response_buf) {
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2021-06-28 06:23:19 +00:00
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pr_err("NULL response header\n");
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2021-03-16 04:07:11 +00:00
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return -EINVAL;
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}
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2021-03-30 03:35:23 +00:00
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if (work->tr_buf) {
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2021-03-16 04:07:11 +00:00
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iov[iov_idx] = (struct kvec) { work->tr_buf,
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2021-11-02 23:25:54 +00:00
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sizeof(struct smb2_transform_hdr) + 4 };
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2021-03-16 04:07:11 +00:00
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len += iov[iov_idx++].iov_len;
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}
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2021-03-30 03:35:23 +00:00
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if (work->aux_payload_sz) {
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2021-11-02 23:08:44 +00:00
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iov[iov_idx] = (struct kvec) { work->response_buf, work->resp_hdr_sz };
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2021-03-16 04:07:11 +00:00
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len += iov[iov_idx++].iov_len;
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2021-03-30 03:35:23 +00:00
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iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
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2021-03-16 04:07:11 +00:00
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len += iov[iov_idx++].iov_len;
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} else {
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2021-03-30 03:35:23 +00:00
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if (work->tr_buf)
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iov[iov_idx].iov_len = work->resp_hdr_sz;
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2021-03-16 04:07:11 +00:00
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else
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2021-11-02 23:08:44 +00:00
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iov[iov_idx].iov_len = get_rfc1002_len(work->response_buf) + 4;
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iov[iov_idx].iov_base = work->response_buf;
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2021-03-16 04:07:11 +00:00
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len += iov[iov_idx++].iov_len;
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}
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ksmbd_conn_lock(conn);
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sent = conn->transport->ops->writev(conn->transport, &iov[0],
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iov_idx, len,
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work->need_invalidate_rkey,
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work->remote_key);
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ksmbd_conn_unlock(conn);
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if (sent < 0) {
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2021-06-28 06:23:19 +00:00
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pr_err("Failed to send message: %d\n", sent);
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2021-03-16 04:07:11 +00:00
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return sent;
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}
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return 0;
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}
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2022-04-29 23:30:25 +00:00
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int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
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void *buf, unsigned int buflen,
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struct smb2_buffer_desc_v1 *desc,
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unsigned int desc_len)
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2021-03-16 04:07:11 +00:00
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{
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int ret = -EINVAL;
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if (conn->transport->ops->rdma_read)
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ret = conn->transport->ops->rdma_read(conn->transport,
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2021-05-26 08:57:12 +00:00
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buf, buflen,
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2022-04-29 23:30:25 +00:00
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desc, desc_len);
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2021-03-16 04:07:11 +00:00
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return ret;
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}
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2022-04-29 23:30:25 +00:00
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int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
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void *buf, unsigned int buflen,
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struct smb2_buffer_desc_v1 *desc,
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unsigned int desc_len)
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2021-03-16 04:07:11 +00:00
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{
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int ret = -EINVAL;
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if (conn->transport->ops->rdma_write)
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ret = conn->transport->ops->rdma_write(conn->transport,
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2021-05-26 08:57:12 +00:00
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buf, buflen,
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2022-04-29 23:30:25 +00:00
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desc, desc_len);
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2021-03-16 04:07:11 +00:00
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return ret;
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}
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bool ksmbd_conn_alive(struct ksmbd_conn *conn)
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{
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if (!ksmbd_server_running())
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return false;
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if (conn->status == KSMBD_SESS_EXITING)
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return false;
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if (kthread_should_stop())
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return false;
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if (atomic_read(&conn->stats.open_files_count) > 0)
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return true;
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/*
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* Stop current session if the time that get last request from client
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2021-07-15 01:22:20 +00:00
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* is bigger than deadtime user configured and opening file count is
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2021-03-16 04:07:11 +00:00
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* zero.
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*/
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if (server_conf.deadtime > 0 &&
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2021-03-30 05:25:35 +00:00
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time_after(jiffies, conn->last_active + server_conf.deadtime)) {
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2021-03-16 04:07:11 +00:00
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ksmbd_debug(CONN, "No response from client in %lu minutes\n",
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2021-05-26 08:57:12 +00:00
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server_conf.deadtime / SMB_ECHO_INTERVAL);
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2021-03-16 04:07:11 +00:00
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return false;
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}
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return true;
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}
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/**
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* ksmbd_conn_handler_loop() - session thread to listen on new smb requests
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* @p: connection instance
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*
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* One thread each per connection
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*
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* Return: 0 on success
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*/
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int ksmbd_conn_handler_loop(void *p)
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{
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struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
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struct ksmbd_transport *t = conn->transport;
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2023-01-24 15:13:20 +00:00
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unsigned int pdu_size, max_allowed_pdu_size;
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2021-03-16 04:07:11 +00:00
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char hdr_buf[4] = {0,};
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int size;
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mutex_init(&conn->srv_mutex);
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__module_get(THIS_MODULE);
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if (t->ops->prepare && t->ops->prepare(t))
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goto out;
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conn->last_active = jiffies;
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while (ksmbd_conn_alive(conn)) {
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if (try_to_freeze())
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continue;
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2021-04-02 03:47:14 +00:00
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kvfree(conn->request_buf);
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2021-03-16 04:07:11 +00:00
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conn->request_buf = NULL;
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2023-03-21 06:25:34 +00:00
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size = t->ops->read(t, hdr_buf, sizeof(hdr_buf), -1);
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2021-03-16 04:07:11 +00:00
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if (size != sizeof(hdr_buf))
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break;
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pdu_size = get_rfc1002_len(hdr_buf);
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ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
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2023-01-24 15:13:20 +00:00
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if (conn->status == KSMBD_SESS_GOOD)
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max_allowed_pdu_size =
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SMB3_MAX_MSGSIZE + conn->vals->max_write_size;
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else
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max_allowed_pdu_size = SMB3_MAX_MSGSIZE;
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if (pdu_size > max_allowed_pdu_size) {
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2023-01-30 09:23:57 +00:00
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pr_err_ratelimited("PDU length(%u) exceeded maximum allowed pdu size(%u) on connection(%d)\n",
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2023-01-24 15:13:20 +00:00
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pdu_size, max_allowed_pdu_size,
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conn->status);
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break;
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}
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2021-09-24 00:17:30 +00:00
|
|
|
/*
|
2023-03-23 12:15:52 +00:00
|
|
|
* Check maximum pdu size(0x00FFFFFF).
|
2021-09-24 00:17:30 +00:00
|
|
|
*/
|
2023-03-23 12:15:52 +00:00
|
|
|
if (pdu_size > MAX_STREAM_PROT_LEN)
|
2023-01-24 15:13:20 +00:00
|
|
|
break;
|
2021-03-16 04:07:11 +00:00
|
|
|
|
|
|
|
/* 4 for rfc1002 length field */
|
|
|
|
size = pdu_size + 4;
|
2022-12-31 08:32:31 +00:00
|
|
|
conn->request_buf = kvmalloc(size,
|
|
|
|
GFP_KERNEL |
|
|
|
|
__GFP_NOWARN |
|
|
|
|
__GFP_NORETRY);
|
2021-03-16 04:07:11 +00:00
|
|
|
if (!conn->request_buf)
|
2022-12-31 08:32:31 +00:00
|
|
|
break;
|
2021-03-16 04:07:11 +00:00
|
|
|
|
|
|
|
memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
|
|
|
|
if (!ksmbd_smb_request(conn))
|
|
|
|
break;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We already read 4 bytes to find out PDU size, now
|
|
|
|
* read in PDU
|
|
|
|
*/
|
2023-03-21 06:25:34 +00:00
|
|
|
size = t->ops->read(t, conn->request_buf + 4, pdu_size, 2);
|
2021-03-16 04:07:11 +00:00
|
|
|
if (size < 0) {
|
2021-06-28 06:23:19 +00:00
|
|
|
pr_err("sock_read failed: %d\n", size);
|
2021-03-16 04:07:11 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (size != pdu_size) {
|
2021-06-28 06:23:19 +00:00
|
|
|
pr_err("PDU error. Read: %d, Expected: %d\n",
|
|
|
|
size, pdu_size);
|
2021-03-16 04:07:11 +00:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!default_conn_ops.process_fn) {
|
2021-06-28 06:23:19 +00:00
|
|
|
pr_err("No connection request callback\n");
|
2021-03-16 04:07:11 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (default_conn_ops.process_fn(conn)) {
|
2021-06-28 06:23:19 +00:00
|
|
|
pr_err("Cannot handle request\n");
|
2021-03-16 04:07:11 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
/* Wait till all reference dropped to the Server object*/
|
2022-07-28 14:35:18 +00:00
|
|
|
wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);
|
|
|
|
|
2021-03-16 04:07:11 +00:00
|
|
|
|
2022-09-15 13:49:11 +00:00
|
|
|
if (IS_ENABLED(CONFIG_UNICODE))
|
|
|
|
utf8_unload(conn->um);
|
2021-03-16 04:07:11 +00:00
|
|
|
unload_nls(conn->local_nls);
|
|
|
|
if (default_conn_ops.terminate_fn)
|
|
|
|
default_conn_ops.terminate_fn(conn);
|
|
|
|
t->ops->disconnect(t);
|
|
|
|
module_put(THIS_MODULE);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
|
|
|
|
{
|
|
|
|
default_conn_ops.process_fn = ops->process_fn;
|
|
|
|
default_conn_ops.terminate_fn = ops->terminate_fn;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ksmbd_conn_transport_init(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
mutex_lock(&init_lock);
|
|
|
|
ret = ksmbd_tcp_init();
|
|
|
|
if (ret) {
|
|
|
|
pr_err("Failed to init TCP subsystem: %d\n", ret);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = ksmbd_rdma_init();
|
|
|
|
if (ret) {
|
2021-07-13 06:38:30 +00:00
|
|
|
pr_err("Failed to init RDMA subsystem: %d\n", ret);
|
2021-03-16 04:07:11 +00:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
mutex_unlock(&init_lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void stop_sessions(void)
|
|
|
|
{
|
|
|
|
struct ksmbd_conn *conn;
|
2022-01-09 02:34:16 +00:00
|
|
|
struct ksmbd_transport *t;
|
2021-03-16 04:07:11 +00:00
|
|
|
|
|
|
|
again:
|
|
|
|
read_lock(&conn_list_lock);
|
|
|
|
list_for_each_entry(conn, &conn_list, conns_list) {
|
|
|
|
struct task_struct *task;
|
|
|
|
|
2022-01-09 02:34:16 +00:00
|
|
|
t = conn->transport;
|
|
|
|
task = t->handler;
|
2021-03-16 04:07:11 +00:00
|
|
|
if (task)
|
|
|
|
ksmbd_debug(CONN, "Stop session handler %s/%d\n",
|
2021-05-26 08:57:12 +00:00
|
|
|
task->comm, task_pid_nr(task));
|
2021-03-16 04:07:11 +00:00
|
|
|
conn->status = KSMBD_SESS_EXITING;
|
2022-01-09 02:34:16 +00:00
|
|
|
if (t->ops->shutdown) {
|
|
|
|
read_unlock(&conn_list_lock);
|
|
|
|
t->ops->shutdown(t);
|
|
|
|
read_lock(&conn_list_lock);
|
|
|
|
}
|
2021-03-16 04:07:11 +00:00
|
|
|
}
|
|
|
|
read_unlock(&conn_list_lock);
|
|
|
|
|
|
|
|
if (!list_empty(&conn_list)) {
|
2021-03-30 05:25:35 +00:00
|
|
|
schedule_timeout_interruptible(HZ / 10); /* 100ms */
|
2021-03-16 04:07:11 +00:00
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void ksmbd_conn_transport_destroy(void)
|
|
|
|
{
|
|
|
|
mutex_lock(&init_lock);
|
|
|
|
ksmbd_tcp_destroy();
|
|
|
|
ksmbd_rdma_destroy();
|
|
|
|
stop_sessions();
|
|
|
|
mutex_unlock(&init_lock);
|
|
|
|
}
|