419 lines
9.4 KiB
C
419 lines
9.4 KiB
C
// 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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LIST_HEAD(conn_list);
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DEFINE_RWLOCK(conn_list_lock);
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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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kvfree(conn->request_buf);
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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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atomic_set(&conn->req_running, 0);
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atomic_set(&conn->r_count, 0);
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conn->total_credits = 1;
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conn->outstanding_credits = 0;
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init_waitqueue_head(&conn->req_running_q);
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INIT_LIST_HEAD(&conn->conns_list);
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INIT_LIST_HEAD(&conn->sessions);
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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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ida_init(&conn->async_ida);
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spin_lock_init(&conn->llist_lock);
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INIT_LIST_HEAD(&conn->lock_list);
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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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work->syncronous = true;
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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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list_empty(&work->async_request_entry))
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return 0;
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if (!work->multiRsp)
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atomic_dec(&conn->req_running);
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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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if (work->syncronous == false)
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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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struct smb_hdr *rsp_hdr = work->response_buf;
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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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ksmbd_conn_try_dequeue_request(work);
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if (!rsp_hdr) {
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pr_err("NULL response header\n");
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return -EINVAL;
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}
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if (work->tr_buf) {
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iov[iov_idx] = (struct kvec) { work->tr_buf,
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sizeof(struct smb2_transform_hdr) };
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len += iov[iov_idx++].iov_len;
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}
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if (work->aux_payload_sz) {
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iov[iov_idx] = (struct kvec) { rsp_hdr, work->resp_hdr_sz };
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len += iov[iov_idx++].iov_len;
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iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
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len += iov[iov_idx++].iov_len;
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} else {
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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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else
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iov[iov_idx].iov_len = get_rfc1002_len(rsp_hdr) + 4;
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iov[iov_idx].iov_base = rsp_hdr;
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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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pr_err("Failed to send message: %d\n", sent);
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return sent;
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}
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return 0;
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}
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int ksmbd_conn_rdma_read(struct ksmbd_conn *conn, void *buf,
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unsigned int buflen, u32 remote_key, u64 remote_offset,
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u32 remote_len)
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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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buf, buflen,
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remote_key, remote_offset,
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remote_len);
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return ret;
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}
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int ksmbd_conn_rdma_write(struct ksmbd_conn *conn, void *buf,
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unsigned int buflen, u32 remote_key,
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u64 remote_offset, u32 remote_len)
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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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buf, buflen,
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remote_key, remote_offset,
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remote_len);
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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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* is bigger than deadtime user configured and opening file count is
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* zero.
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*/
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if (server_conf.deadtime > 0 &&
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time_after(jiffies, conn->last_active + server_conf.deadtime)) {
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ksmbd_debug(CONN, "No response from client in %lu minutes\n",
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server_conf.deadtime / SMB_ECHO_INTERVAL);
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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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unsigned int pdu_size;
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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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kvfree(conn->request_buf);
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conn->request_buf = NULL;
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size = t->ops->read(t, hdr_buf, sizeof(hdr_buf));
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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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/*
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* Check if pdu size is valid (min : smb header size,
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* max : 0x00FFFFFF).
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*/
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if (pdu_size < __SMB2_HEADER_STRUCTURE_SIZE ||
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pdu_size > MAX_STREAM_PROT_LEN) {
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continue;
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}
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/* 4 for rfc1002 length field */
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size = pdu_size + 4;
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conn->request_buf = kvmalloc(size, GFP_KERNEL);
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if (!conn->request_buf)
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continue;
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memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
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if (!ksmbd_smb_request(conn))
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break;
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/*
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* We already read 4 bytes to find out PDU size, now
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* read in PDU
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*/
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size = t->ops->read(t, conn->request_buf + 4, pdu_size);
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if (size < 0) {
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pr_err("sock_read failed: %d\n", size);
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break;
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}
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if (size != pdu_size) {
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pr_err("PDU error. Read: %d, Expected: %d\n",
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size, pdu_size);
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continue;
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}
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if (!default_conn_ops.process_fn) {
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pr_err("No connection request callback\n");
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break;
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}
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if (default_conn_ops.process_fn(conn)) {
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pr_err("Cannot handle request\n");
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break;
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}
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}
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out:
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/* Wait till all reference dropped to the Server object*/
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while (atomic_read(&conn->r_count) > 0)
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schedule_timeout(HZ);
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unload_nls(conn->local_nls);
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if (default_conn_ops.terminate_fn)
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default_conn_ops.terminate_fn(conn);
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t->ops->disconnect(t);
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module_put(THIS_MODULE);
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return 0;
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}
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void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
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{
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default_conn_ops.process_fn = ops->process_fn;
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default_conn_ops.terminate_fn = ops->terminate_fn;
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}
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int ksmbd_conn_transport_init(void)
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{
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int ret;
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mutex_lock(&init_lock);
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ret = ksmbd_tcp_init();
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if (ret) {
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pr_err("Failed to init TCP subsystem: %d\n", ret);
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goto out;
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}
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ret = ksmbd_rdma_init();
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if (ret) {
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pr_err("Failed to init RDMA subsystem: %d\n", ret);
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goto out;
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}
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out:
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mutex_unlock(&init_lock);
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return ret;
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}
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static void stop_sessions(void)
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{
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struct ksmbd_conn *conn;
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again:
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read_lock(&conn_list_lock);
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list_for_each_entry(conn, &conn_list, conns_list) {
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struct task_struct *task;
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task = conn->transport->handler;
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if (task)
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ksmbd_debug(CONN, "Stop session handler %s/%d\n",
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task->comm, task_pid_nr(task));
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conn->status = KSMBD_SESS_EXITING;
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}
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read_unlock(&conn_list_lock);
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if (!list_empty(&conn_list)) {
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schedule_timeout_interruptible(HZ / 10); /* 100ms */
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goto again;
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}
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}
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void ksmbd_conn_transport_destroy(void)
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{
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mutex_lock(&init_lock);
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ksmbd_tcp_destroy();
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ksmbd_rdma_destroy();
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stop_sessions();
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mutex_unlock(&init_lock);
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}
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