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-rw-r--r--fs/smb/server/connection.c470
1 files changed, 470 insertions, 0 deletions
diff --git a/fs/smb/server/connection.c b/fs/smb/server/connection.c
new file mode 100644
index 000000000000..4882a812ea86
--- /dev/null
+++ b/fs/smb/server/connection.c
@@ -0,0 +1,470 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/mutex.h>
+#include <linux/freezer.h>
+#include <linux/module.h>
+
+#include "server.h"
+#include "smb_common.h"
+#include "mgmt/ksmbd_ida.h"
+#include "connection.h"
+#include "transport_tcp.h"
+#include "transport_rdma.h"
+
+static DEFINE_MUTEX(init_lock);
+
+static struct ksmbd_conn_ops default_conn_ops;
+
+LIST_HEAD(conn_list);
+DECLARE_RWSEM(conn_list_lock);
+
+/**
+ * ksmbd_conn_free() - free resources of the connection instance
+ *
+ * @conn: connection instance to be cleand up
+ *
+ * During the thread termination, the corresponding conn instance
+ * resources(sock/memory) are released and finally the conn object is freed.
+ */
+void ksmbd_conn_free(struct ksmbd_conn *conn)
+{
+ down_write(&conn_list_lock);
+ list_del(&conn->conns_list);
+ up_write(&conn_list_lock);
+
+ xa_destroy(&conn->sessions);
+ kvfree(conn->request_buf);
+ kfree(conn->preauth_info);
+ kfree(conn);
+}
+
+/**
+ * ksmbd_conn_alloc() - initialize a new connection instance
+ *
+ * Return: ksmbd_conn struct on success, otherwise NULL
+ */
+struct ksmbd_conn *ksmbd_conn_alloc(void)
+{
+ struct ksmbd_conn *conn;
+
+ conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL);
+ if (!conn)
+ return NULL;
+
+ conn->need_neg = true;
+ ksmbd_conn_set_new(conn);
+ conn->local_nls = load_nls("utf8");
+ if (!conn->local_nls)
+ conn->local_nls = load_nls_default();
+ if (IS_ENABLED(CONFIG_UNICODE))
+ conn->um = utf8_load(UNICODE_AGE(12, 1, 0));
+ else
+ conn->um = ERR_PTR(-EOPNOTSUPP);
+ if (IS_ERR(conn->um))
+ conn->um = NULL;
+ atomic_set(&conn->req_running, 0);
+ atomic_set(&conn->r_count, 0);
+ conn->total_credits = 1;
+ conn->outstanding_credits = 0;
+
+ init_waitqueue_head(&conn->req_running_q);
+ init_waitqueue_head(&conn->r_count_q);
+ INIT_LIST_HEAD(&conn->conns_list);
+ INIT_LIST_HEAD(&conn->requests);
+ INIT_LIST_HEAD(&conn->async_requests);
+ spin_lock_init(&conn->request_lock);
+ spin_lock_init(&conn->credits_lock);
+ ida_init(&conn->async_ida);
+ xa_init(&conn->sessions);
+
+ spin_lock_init(&conn->llist_lock);
+ INIT_LIST_HEAD(&conn->lock_list);
+
+ down_write(&conn_list_lock);
+ list_add(&conn->conns_list, &conn_list);
+ up_write(&conn_list_lock);
+ return conn;
+}
+
+bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
+{
+ struct ksmbd_conn *t;
+ bool ret = false;
+
+ down_read(&conn_list_lock);
+ list_for_each_entry(t, &conn_list, conns_list) {
+ if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
+ continue;
+
+ ret = true;
+ break;
+ }
+ up_read(&conn_list_lock);
+ return ret;
+}
+
+void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
+{
+ struct ksmbd_conn *conn = work->conn;
+ struct list_head *requests_queue = NULL;
+
+ if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE)
+ requests_queue = &conn->requests;
+
+ if (requests_queue) {
+ atomic_inc(&conn->req_running);
+ spin_lock(&conn->request_lock);
+ list_add_tail(&work->request_entry, requests_queue);
+ spin_unlock(&conn->request_lock);
+ }
+}
+
+int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
+{
+ struct ksmbd_conn *conn = work->conn;
+ int ret = 1;
+
+ if (list_empty(&work->request_entry) &&
+ list_empty(&work->async_request_entry))
+ return 0;
+
+ if (!work->multiRsp)
+ atomic_dec(&conn->req_running);
+ if (!work->multiRsp) {
+ spin_lock(&conn->request_lock);
+ list_del_init(&work->request_entry);
+ spin_unlock(&conn->request_lock);
+ if (work->asynchronous)
+ release_async_work(work);
+ ret = 0;
+ }
+
+ wake_up_all(&conn->req_running_q);
+ return ret;
+}
+
+void ksmbd_conn_lock(struct ksmbd_conn *conn)
+{
+ mutex_lock(&conn->srv_mutex);
+}
+
+void ksmbd_conn_unlock(struct ksmbd_conn *conn)
+{
+ mutex_unlock(&conn->srv_mutex);
+}
+
+void ksmbd_all_conn_set_status(u64 sess_id, u32 status)
+{
+ struct ksmbd_conn *conn;
+
+ down_read(&conn_list_lock);
+ list_for_each_entry(conn, &conn_list, conns_list) {
+ if (conn->binding || xa_load(&conn->sessions, sess_id))
+ WRITE_ONCE(conn->status, status);
+ }
+ up_read(&conn_list_lock);
+}
+
+void ksmbd_conn_wait_idle(struct ksmbd_conn *conn, u64 sess_id)
+{
+ struct ksmbd_conn *bind_conn;
+
+ wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
+
+ down_read(&conn_list_lock);
+ list_for_each_entry(bind_conn, &conn_list, conns_list) {
+ if (bind_conn == conn)
+ continue;
+
+ if ((bind_conn->binding || xa_load(&bind_conn->sessions, sess_id)) &&
+ !ksmbd_conn_releasing(bind_conn) &&
+ atomic_read(&bind_conn->req_running)) {
+ wait_event(bind_conn->req_running_q,
+ atomic_read(&bind_conn->req_running) == 0);
+ }
+ }
+ up_read(&conn_list_lock);
+}
+
+int ksmbd_conn_write(struct ksmbd_work *work)
+{
+ struct ksmbd_conn *conn = work->conn;
+ size_t len = 0;
+ int sent;
+ struct kvec iov[3];
+ int iov_idx = 0;
+
+ if (!work->response_buf) {
+ pr_err("NULL response header\n");
+ return -EINVAL;
+ }
+
+ if (work->tr_buf) {
+ iov[iov_idx] = (struct kvec) { work->tr_buf,
+ sizeof(struct smb2_transform_hdr) + 4 };
+ len += iov[iov_idx++].iov_len;
+ }
+
+ if (work->aux_payload_sz) {
+ iov[iov_idx] = (struct kvec) { work->response_buf, work->resp_hdr_sz };
+ len += iov[iov_idx++].iov_len;
+ iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
+ len += iov[iov_idx++].iov_len;
+ } else {
+ if (work->tr_buf)
+ iov[iov_idx].iov_len = work->resp_hdr_sz;
+ else
+ iov[iov_idx].iov_len = get_rfc1002_len(work->response_buf) + 4;
+ iov[iov_idx].iov_base = work->response_buf;
+ len += iov[iov_idx++].iov_len;
+ }
+
+ ksmbd_conn_lock(conn);
+ sent = conn->transport->ops->writev(conn->transport, &iov[0],
+ iov_idx, len,
+ work->need_invalidate_rkey,
+ work->remote_key);
+ ksmbd_conn_unlock(conn);
+
+ if (sent < 0) {
+ pr_err("Failed to send message: %d\n", sent);
+ return sent;
+ }
+
+ return 0;
+}
+
+int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
+ void *buf, unsigned int buflen,
+ struct smb2_buffer_desc_v1 *desc,
+ unsigned int desc_len)
+{
+ int ret = -EINVAL;
+
+ if (conn->transport->ops->rdma_read)
+ ret = conn->transport->ops->rdma_read(conn->transport,
+ buf, buflen,
+ desc, desc_len);
+ return ret;
+}
+
+int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
+ void *buf, unsigned int buflen,
+ struct smb2_buffer_desc_v1 *desc,
+ unsigned int desc_len)
+{
+ int ret = -EINVAL;
+
+ if (conn->transport->ops->rdma_write)
+ ret = conn->transport->ops->rdma_write(conn->transport,
+ buf, buflen,
+ desc, desc_len);
+ return ret;
+}
+
+bool ksmbd_conn_alive(struct ksmbd_conn *conn)
+{
+ if (!ksmbd_server_running())
+ return false;
+
+ if (ksmbd_conn_exiting(conn))
+ return false;
+
+ if (kthread_should_stop())
+ return false;
+
+ if (atomic_read(&conn->stats.open_files_count) > 0)
+ return true;
+
+ /*
+ * Stop current session if the time that get last request from client
+ * is bigger than deadtime user configured and opening file count is
+ * zero.
+ */
+ if (server_conf.deadtime > 0 &&
+ time_after(jiffies, conn->last_active + server_conf.deadtime)) {
+ ksmbd_debug(CONN, "No response from client in %lu minutes\n",
+ server_conf.deadtime / SMB_ECHO_INTERVAL);
+ return false;
+ }
+ return true;
+}
+
+/**
+ * ksmbd_conn_handler_loop() - session thread to listen on new smb requests
+ * @p: connection instance
+ *
+ * One thread each per connection
+ *
+ * Return: 0 on success
+ */
+int ksmbd_conn_handler_loop(void *p)
+{
+ struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
+ struct ksmbd_transport *t = conn->transport;
+ unsigned int pdu_size, max_allowed_pdu_size;
+ char hdr_buf[4] = {0,};
+ int size;
+
+ mutex_init(&conn->srv_mutex);
+ __module_get(THIS_MODULE);
+
+ if (t->ops->prepare && t->ops->prepare(t))
+ goto out;
+
+ conn->last_active = jiffies;
+ while (ksmbd_conn_alive(conn)) {
+ if (try_to_freeze())
+ continue;
+
+ kvfree(conn->request_buf);
+ conn->request_buf = NULL;
+
+ size = t->ops->read(t, hdr_buf, sizeof(hdr_buf), -1);
+ if (size != sizeof(hdr_buf))
+ break;
+
+ pdu_size = get_rfc1002_len(hdr_buf);
+ ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
+
+ if (ksmbd_conn_good(conn))
+ max_allowed_pdu_size =
+ SMB3_MAX_MSGSIZE + conn->vals->max_write_size;
+ else
+ max_allowed_pdu_size = SMB3_MAX_MSGSIZE;
+
+ if (pdu_size > max_allowed_pdu_size) {
+ pr_err_ratelimited("PDU length(%u) exceeded maximum allowed pdu size(%u) on connection(%d)\n",
+ pdu_size, max_allowed_pdu_size,
+ READ_ONCE(conn->status));
+ break;
+ }
+
+ /*
+ * Check maximum pdu size(0x00FFFFFF).
+ */
+ if (pdu_size > MAX_STREAM_PROT_LEN)
+ break;
+
+ /* 4 for rfc1002 length field */
+ /* 1 for implied bcc[0] */
+ size = pdu_size + 4 + 1;
+ conn->request_buf = kvmalloc(size, GFP_KERNEL);
+ if (!conn->request_buf)
+ break;
+
+ 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
+ */
+ size = t->ops->read(t, conn->request_buf + 4, pdu_size, 2);
+ if (size < 0) {
+ pr_err("sock_read failed: %d\n", size);
+ break;
+ }
+
+ if (size != pdu_size) {
+ pr_err("PDU error. Read: %d, Expected: %d\n",
+ size, pdu_size);
+ continue;
+ }
+
+ if (!default_conn_ops.process_fn) {
+ pr_err("No connection request callback\n");
+ break;
+ }
+
+ if (default_conn_ops.process_fn(conn)) {
+ pr_err("Cannot handle request\n");
+ break;
+ }
+ }
+
+out:
+ ksmbd_conn_set_releasing(conn);
+ /* Wait till all reference dropped to the Server object*/
+ wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);
+
+ if (IS_ENABLED(CONFIG_UNICODE))
+ utf8_unload(conn->um);
+ 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) {
+ pr_err("Failed to init RDMA subsystem: %d\n", ret);
+ goto out;
+ }
+out:
+ mutex_unlock(&init_lock);
+ return ret;
+}
+
+static void stop_sessions(void)
+{
+ struct ksmbd_conn *conn;
+ struct ksmbd_transport *t;
+
+again:
+ down_read(&conn_list_lock);
+ list_for_each_entry(conn, &conn_list, conns_list) {
+ struct task_struct *task;
+
+ t = conn->transport;
+ task = t->handler;
+ if (task)
+ ksmbd_debug(CONN, "Stop session handler %s/%d\n",
+ task->comm, task_pid_nr(task));
+ ksmbd_conn_set_exiting(conn);
+ if (t->ops->shutdown) {
+ up_read(&conn_list_lock);
+ t->ops->shutdown(t);
+ down_read(&conn_list_lock);
+ }
+ }
+ up_read(&conn_list_lock);
+
+ if (!list_empty(&conn_list)) {
+ schedule_timeout_interruptible(HZ / 10); /* 100ms */
+ goto again;
+ }
+}
+
+void ksmbd_conn_transport_destroy(void)
+{
+ mutex_lock(&init_lock);
+ ksmbd_tcp_destroy();
+ ksmbd_rdma_destroy();
+ stop_sessions();
+ mutex_unlock(&init_lock);
+}