path: root/net/tipc/port.c

/*
 * net/tipc/port.c: TIPC port code
 *
 * Copyright (c) 1992-2007, Ericsson AB
 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "core.h"
#include "config.h"
#include "port.h"
#include "name_table.h"

/* Connection management: */
#define PROBING_INTERVAL 3600000	/* [ms] => 1 h */
#define CONFIRMED 0
#define PROBING 1

#define MAX_REJECT_SIZE 1024

DEFINE_SPINLOCK(tipc_port_list_lock);

static LIST_HEAD(ports);
static void port_handle_node_down(unsigned long ref);
static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
static void port_timeout(unsigned long ref);


static u32 port_peernode(struct tipc_port *p_ptr)
{
	return msg_destnode(&p_ptr->phdr);
}

static u32 port_peerport(struct tipc_port *p_ptr)
{
	return msg_destport(&p_ptr->phdr);
}

/**
 * tipc_port_peer_msg - verify message was sent by connected port's peer
 *
 * Handles cases where the node's network address has changed from
 * the default of <0.0.0> to its configured setting.
 */
int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
{
	u32 peernode;
	u32 orignode;

	if (msg_origport(msg) != port_peerport(p_ptr))
		return 0;

	orignode = msg_orignode(msg);
	peernode = port_peernode(p_ptr);
	return (orignode == peernode) ||
		(!orignode && (peernode == tipc_own_addr)) ||
		(!peernode && (orignode == tipc_own_addr));
}

/**
 * tipc_multicast - send a multicast message to local and remote destinations
 */
int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
		   u32 num_sect, struct iovec const *msg_sect,
		   unsigned int total_len)
{
	struct tipc_msg *hdr;
	struct sk_buff *buf;
	struct sk_buff *ibuf = NULL;
	struct tipc_port_list dports = {0, NULL, };
	struct tipc_port *oport = tipc_port_deref(ref);
	int ext_targets;
	int res;

	if (unlikely(!oport))
		return -EINVAL;

	/* Create multicast message */
	hdr = &oport->phdr;
	msg_set_type(hdr, TIPC_MCAST_MSG);
	msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
	msg_set_destport(hdr, 0);
	msg_set_destnode(hdr, 0);
	msg_set_nametype(hdr, seq->type);
	msg_set_namelower(hdr, seq->lower);
	msg_set_nameupper(hdr, seq->upper);
	msg_set_hdr_sz(hdr, MCAST_H_SIZE);
	res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
			     &buf);
	if (unlikely(!buf))
		return res;

	/* Figure out where to send multicast message */
	ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
						TIPC_NODE_SCOPE, &dports);

	/* Send message to destinations (duplicate it only if necessary) */
	if (ext_targets) {
		if (dports.count != 0) {
			ibuf = skb_copy(buf, GFP_ATOMIC);
			if (ibuf == NULL) {
				tipc_port_list_free(&dports);
				kfree_skb(buf);
				return -ENOMEM;
			}
		}
		res = tipc_bclink_send_msg(buf);
		if ((res < 0) && (dports.count != 0))
			kfree_skb(ibuf);
	} else {
		ibuf = buf;
	}

	if