1 files changed, 270 insertions, 0 deletions
diff --git a/net/rxrpc/krxsecd.c b/net/rxrpc/krxsecd.c
new file mode 100644
index 00000000000..6020c89d922
--- /dev/null
+++ b/net/rxrpc/krxsecd.c
@@ -0,0 +1,270 @@
+/* krxsecd.c: Rx security daemon
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * This daemon deals with:
+ * - consulting the application as to whether inbound peers and calls should be authorised
+ * - generating security challenges for inbound connections
+ * - responding to security challenges on outbound connections
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <rxrpc/krxsecd.h>
+#include <rxrpc/transport.h>
+#include <rxrpc/connection.h>
+#include <rxrpc/message.h>
+#include <rxrpc/peer.h>
+#include <rxrpc/call.h>
+#include <linux/udp.h>
+#include <linux/ip.h>
+#include <net/sock.h>
+#include "internal.h"
+
+static DECLARE_WAIT_QUEUE_HEAD(rxrpc_krxsecd_sleepq);
+static DECLARE_COMPLETION(rxrpc_krxsecd_dead);
+static volatile int rxrpc_krxsecd_die;
+
+static atomic_t rxrpc_krxsecd_qcount;
+
+/* queue of unprocessed inbound messages with seqno #1 and
+ * RXRPC_CLIENT_INITIATED flag set */
+static LIST_HEAD(rxrpc_krxsecd_initmsgq);
+static DEFINE_SPINLOCK(rxrpc_krxsecd_initmsgq_lock);
+
+static void rxrpc_krxsecd_process_incoming_call(struct rxrpc_message *msg);
+
+/*****************************************************************************/
+/*
+ * Rx security daemon
+ */
+static int rxrpc_krxsecd(void *arg)
+{
+	DECLARE_WAITQUEUE(krxsecd, current);
+
+	int die;
+
+	printk("Started krxsecd %d\n", current->pid);
+
+	daemonize("krxsecd");
+
+	/* loop around waiting for work to do */
+	do {
+		/* wait for work or to be told to exit */
+		_debug("### Begin Wait");
+		if (!atomic_read(&rxrpc_krxsecd_qcount)) {
+			set_current_state(TASK_INTERRUPTIBLE);
+
+			add_wait_queue(&rxrpc_krxsecd_sleepq, &krxsecd);
+
+			for (;;) {
+				set_current_state(TASK_INTERRUPTIBLE);
+				if (atomic_read(&rxrpc_krxsecd_qcount) ||
+				    rxrpc_krxsecd_die ||
+				    signal_pending(current))
+					break;
+
+				schedule();
+			}
+
+			remove_wait_queue(&rxrpc_krxsecd_sleepq, &krxsecd);
+			set_current_state(TASK_RUNNING);
+		}
+		die = rxrpc_krxsecd_die;
+		_debug("### End Wait");
+
+		/* see if there're incoming calls in need of authenticating */
+		_debug("### Begin Inbound Calls");
+
+		if (!list_empty(&rxrpc_krxsecd_initmsgq)) {
+			struct rxrpc_message *msg = NULL;
+
+			spin_lock(&rxrpc_krxsecd_initmsgq_lock);
+
+			if (!list_empty(&rxrpc_krxsecd_initmsgq)) {
+				msg = list_entry(rxrpc_krxsecd_initmsgq.next,
+						 struct rxrpc_message, link);
+				list_del_init(&msg->link);
+				atomic_dec(&rxrpc_krxsecd_qcount);
+			}
+
+			spin_unlock(&rxrpc_krxsecd_initmsgq_lock);
+
+			if (msg) {
+				rxrpc_krxsecd_process_incoming_call(msg);
+				rxrpc_put_message(msg);
+			}
+		}
+
+		_debug("### End Inbound Calls");
+
+		try_to_freeze(PF_FREEZE);
+
+                /* discard pending signals */
+		rxrpc_discard_my_signals();
+
+	} while (!die);
+
+	/* and that's all */
+	complete_and_exit(&rxrpc_krxsecd_dead, 0);
+
+} /* end rxrpc_krxsecd() */
+
+/*****************************************************************************/
+/*
+ * start up a krxsecd daemon
+ */
+int __init rxrpc_krxsecd_init(void)
+{
+	return kernel_thread(rxrpc_krxsecd, NULL, 0);
+
+} /* end rxrpc_krxsecd_init() */
+
+/*****************************************************************************/
+/*
+ * kill the krxsecd daemon and wait for it to complete
+ */
+void rxrpc_krxsecd_kill(void)
+{
+	rxrpc_krxsecd_die = 1;
+	wake_up_all(&rxrpc_krxsecd_sleepq);
+	wait_for_completion(&rxrpc_krxsecd_dead);
+
+} /* end rxrpc_krxsecd_kill() */
+
+/*****************************************************************************/
+/*
+ * clear all pending incoming calls for the specified transport
+ */
+void rxrpc_krxsecd_clear_transport(struct rxrpc_transport *trans)
+{
+	LIST_HEAD(tmp);
+
+	struct rxrpc_message *msg;
+	struct list_head *_p, *_n;
+
+	_enter("%p",trans);
+
+	/* move all the messages for this transport onto a temp list */
+	spin_lock(&rxrpc_krxsecd_initmsgq_lock);
+
+	list_for_each_safe(_p, _n, &rxrpc_krxsecd_initmsgq) {
+		msg = list_entry(_p, struct rxrpc_message, link);
+		if (msg->trans == trans) {
+			list_del(&msg->link);
+			list_add_tail(&msg->link, &tmp);
+			atomic_dec(&rxrpc_krxsecd_qcount);
+		}
+	}
+
+	spin_unlock(&rxrpc_krxsecd_initmsgq_lock);
+
+	/* zap all messages on the temp list */
+	while (!list_empty(&tmp)) {
+		msg = list_entry(tmp.next, struct rxrpc_message, link);
+		list_del_init(&msg->link);
+		rxrpc_put_message(msg);
+	}
+
+	_leave("");
+} /* end rxrpc_krxsecd_clear_transport() */
+
+/*****************************************************************************/
+/*
+ * queue a message on the incoming calls list
+ */
+void rxrpc_krxsecd_queue_incoming_call(struct rxrpc_message *msg)
+{
+	_enter("%p", msg);
+
+	/* queue for processing by krxsecd */
+	spin_lock(&rxrpc_krxsecd_initmsgq_lock);
+
+	if (!rxrpc_krxsecd_die) {
+		rxrpc_get_message(msg);
+		list_add_tail(&msg->link, &rxrpc_krxsecd_initmsgq);
+		atomic_inc(&rxrpc_krxsecd_qcount);
+	}
+
+	spin_unlock(&rxrpc_krxsecd_initmsgq_lock);
+
+	wake_up(&rxrpc_krxsecd_sleepq);
+
+	_leave("");
+} /* end rxrpc_krxsecd_queue_incoming_call() */
+
+/*****************************************************************************/
+/*
+ * process the initial message of an incoming call
+ */
+void rxrpc_krxsecd_process_incoming_call(struct rxrpc_message *msg)
+{
+	struct rxrpc_transport *trans = msg->trans;
+	struct rxrpc_service *srv;
+	struct rxrpc_call *call;
+	struct list_head *_p;
+	unsigned short sid;
+	int ret;
+
+	_enter("%p{tr=%p}", msg, trans);
+
+	ret = rxrpc_incoming_call(msg->conn, msg, &call);
+	if (ret < 0)
+		goto out;
+
+	/* find the matching service on the transport */
+	sid = ntohs(msg->hdr.serviceId);
+	srv = NULL;
+
+	spin_lock(&trans->lock);
+	list_for_each(_p, &trans->services) {
+		srv = list_entry(_p, struct rxrpc_service, link);
+		if (srv->service_id == sid && try_module_get(srv->owner)) {
+			/* found a match (made sure it won't vanish) */
+			_debug("found service '%s'", srv->name);
+			call->owner = srv->owner;
+			break;
+		}
+	}
+	spin_unlock(&trans->lock);
+
+	/* report the new connection
+	 * - the func must inc the call's usage count to keep it
+	 */
+	ret = -ENOENT;
+	if (_p != &trans->services) {
+		/* attempt to accept the call */
+		call->conn->service = srv;
+		call->app_attn_func = srv->attn_func;
+		call->app_error_func = srv->error_func;
+		call->app_aemap_func = srv->aemap_func;
+
+		ret = srv->new_call(call);
+
+		/* send an abort if an error occurred */
+		if (ret < 0) {
+			rxrpc_call_abort(call, ret);
+		}
+		else {
+			/* formally receive and ACK the new packet */
+			ret = rxrpc_conn_receive_call_packet(call->conn,
+							     call, msg);
+		}
+	}
+
+	rxrpc_put_call(call);
+ out:
+	if (ret < 0)
+		rxrpc_trans_immediate_abort(trans, msg, ret);
+
+	_leave(" (%d)", ret);
+} /* end rxrpc_krxsecd_process_incoming_call() */