totemudpu.c
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totemudpu.c
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	/*
	* Copyright (c) 2005 MontaVista Software, Inc.
	* Copyright (c) 2006-2018 Red Hat, Inc.
	*
	* All rights reserved.
	*
	* Author: Steven Dake (sdake@redhat.com)

	* This software licensed under BSD license, the text of which follows:
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* - Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	* - 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.
	* - Neither the name of the MontaVista Software, Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from this
	* software without specific prior written permission.
	*
	* 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 <config.h>

	#include <assert.h>
	#include <sys/mman.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/socket.h>
	#include <netdb.h>
	#include <sys/un.h>
	#include <sys/ioctl.h>
	#include <sys/param.h>
	#include <netinet/in.h>
	#include <arpa/inet.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <errno.h>
	#include <sched.h>
	#include <time.h>
	#include <sys/time.h>
	#include <sys/poll.h>
	#include <sys/uio.h>
	#include <limits.h>

	#include <qb/qblist.h>
	#include <qb/qbdefs.h>
	#include <qb/qbloop.h>

	#include <corosync/sq.h>
	#include <corosync/swab.h>
	#define LOGSYS_UTILS_ONLY 1
	#include <corosync/logsys.h>
	#include "totemudpu.h"

	#include "util.h"

	#ifndef MSG_NOSIGNAL
	#define MSG_NOSIGNAL 0
	#endif

	#define MCAST_SOCKET_BUFFER_SIZE (TRANSMITS_ALLOWED * UDP_RECEIVE_FRAME_SIZE_MAX)
	#define NETIF_STATE_REPORT_UP 1
	#define NETIF_STATE_REPORT_DOWN 2

	#define BIND_STATE_UNBOUND 0
	#define BIND_STATE_REGULAR 1
	#define BIND_STATE_LOOPBACK 2

	struct totemudpu_member {
	struct qb_list_head list;
	struct totem_ip_address member;
	int fd;
	int active;
	};

	struct totemudpu_instance {
	qb_loop_t *totemudpu_poll_handle;

	struct totem_interface *totem_interface;

	int netif_state_report;

	int netif_bind_state;

	void *context;

	void (*totemudpu_deliver_fn) (
	void *context,
	const void *msg,
	unsigned int msg_len,
	const struct sockaddr_storage *system_from);

	void (*totemudpu_iface_change_fn) (
	void *context,
	const struct totem_ip_address *iface_address,
	unsigned int ring_no);

	void (totemudpu_target_set_completed) (void context);

	/*
	* Function and data used to log messages
	*/
	int totemudpu_log_level_security;

	int totemudpu_log_level_error;

	int totemudpu_log_level_warning;

	int totemudpu_log_level_notice;

	int totemudpu_log_level_debug;

	int totemudpu_subsys_id;

	void (*totemudpu_log_printf) (
	int level,
	int subsys,
	const char *function,
	const char *file,
	int line,
	const char *format,
	...)__attribute__((format(printf, 6, 7)));

	void *udpu_context;

	char iov_buffer[UDP_RECEIVE_FRAME_SIZE_MAX];

	struct iovec totemudpu_iov_recv;

	struct qb_list_head member_list;

	int stats_sent;

	int stats_recv;

	int stats_delv;

	int stats_remcasts;

	int stats_orf_token;

	struct timeval stats_tv_start;

	struct totem_ip_address my_id;

	int firstrun;

	qb_loop_timer_handle timer_netif_check_timeout;

	unsigned int my_memb_entries;

	struct totem_config *totem_config;

	totemsrp_stats_t *stats;

	struct totem_ip_address token_target;

	int token_socket;

	int local_loop_sock[2];

	qb_loop_timer_handle timer_merge_detect_timeout;

	int send_merge_detect_message;

	unsigned int merge_detect_messages_sent_before_timeout;
	};

	struct work_item {
	const void *msg;
	unsigned int msg_len;
	struct totemudpu_instance *instance;
	};

	static int totemudpu_build_sockets (
	struct totemudpu_instance *instance,
	struct totem_ip_address *bindnet_address,
	struct totem_ip_address *bound_to);

	static int totemudpu_create_sending_socket(
	void *udpu_context,
	const struct totem_ip_address *member);

	int totemudpu_member_list_rebind_ip (
	void *udpu_context);

	static void totemudpu_start_merge_detect_timeout(
	void *udpu_context);

	static void totemudpu_stop_merge_detect_timeout(
	void *udpu_context);

	static void totemudpu_instance_initialize (struct totemudpu_instance *instance)
	{
	memset (instance, 0, sizeof (struct totemudpu_instance));

	instance->netif_state_report = NETIF_STATE_REPORT_UP \| NETIF_STATE_REPORT_DOWN;

	instance->totemudpu_iov_recv.iov_base = instance->iov_buffer;

	instance->totemudpu_iov_recv.iov_len = UDP_RECEIVE_FRAME_SIZE_MAX; //sizeof (instance->iov_buffer);

	/*
	* There is always atleast 1 processor
	*/
	instance->my_memb_entries = 1;

	qb_list_init (&instance->member_list);
	}

	#define log_printf(level, format, args...) \
	do { \
	instance->totemudpu_log_printf ( \
	level, instance->totemudpu_subsys_id, \
	__FUNCTION__, __FILE__, __LINE__, \
	(const char *)format, ##args); \
	} while (0);
	#define LOGSYS_PERROR(err_num, level, fmt, args...) \
	do { \
	char _error_str[LOGSYS_MAX_PERROR_MSG_LEN]; \
	const char *_error_ptr = qb_strerror_r(err_num, _error_str, sizeof(_error_str)); \
	instance->totemudpu_log_printf ( \
	level, instance->totemudpu_subsys_id, \
	__FUNCTION__, __FILE__, __LINE__, \
	fmt ": %s (%d)", ##args, _error_ptr, err_num); \
	} while(0)

	int totemudpu_crypto_set (
	void *udpu_context,
	const char *cipher_type,
	const char *hash_type)
	{

	return (0);
	}


	static inline void ucast_sendmsg (
	struct totemudpu_instance *instance,
	struct totem_ip_address *system_to,
	const void *msg,
	unsigned int msg_len)
	{
	struct msghdr msg_ucast;
	int res = 0;
	struct sockaddr_storage sockaddr;
	struct iovec iovec;
	int addrlen;
	int send_sock;

	iovec.iov_base = (void *)msg;
	iovec.iov_len = msg_len;

	/*
	* Build unicast message
	*/
	totemip_totemip_to_sockaddr_convert(system_to,
	instance->totem_interface->ip_port, &sockaddr, &addrlen);
	memset(&msg_ucast, 0, sizeof(msg_ucast));
	msg_ucast.msg_name = &sockaddr;
	msg_ucast.msg_namelen = addrlen;
	msg_ucast.msg_iov = (void *)&iovec;
	msg_ucast.msg_iovlen = 1;
	#ifdef HAVE_MSGHDR_CONTROL
	msg_ucast.msg_control = 0;
	#endif
	#ifdef HAVE_MSGHDR_CONTROLLEN
	msg_ucast.msg_controllen = 0;
	#endif
	#ifdef HAVE_MSGHDR_FLAGS
	msg_ucast.msg_flags = 0;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTS
	msg_ucast.msg_accrights = NULL;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTSLEN
	msg_ucast.msg_accrightslen = 0;
	#endif

	if (instance->netif_bind_state == BIND_STATE_REGULAR) {
	send_sock = instance->token_socket;
	} else {
	send_sock = instance->local_loop_sock[1];
	msg_ucast.msg_name = NULL;
	msg_ucast.msg_namelen = 0;
	}


	/*
	* Transmit unicast message
	* An error here is recovered by totemsrp
	*/
	res = sendmsg (send_sock, &msg_ucast, MSG_NOSIGNAL);
	if (res < 0) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_debug,
	"sendmsg(ucast) failed (non-critical)");
	}
	}

	static inline void mcast_sendmsg (
	struct totemudpu_instance *instance,
	const void *msg,
	unsigned int msg_len,
	int only_active)
	{
	struct msghdr msg_mcast;
	int res = 0;
	struct iovec iovec;
	struct sockaddr_storage sockaddr;
	int addrlen;
	struct qb_list_head *list;
	struct totemudpu_member *member;

	iovec.iov_base = (void *)msg;
	iovec.iov_len = msg_len;

	memset(&msg_mcast, 0, sizeof(msg_mcast));
	/*
	* Build multicast message
	*/
	if (instance->netif_bind_state == BIND_STATE_REGULAR) {
	qb_list_for_each(list, &(instance->member_list)) {
	member = qb_list_entry (list,
	struct totemudpu_member,
	list);
	/*
	* Do not send multicast message if message is not "flush", member
	* is inactive and timeout for sending merge message didn't expired.
	*/
	if (only_active && !member->active && !instance->send_merge_detect_message)
	continue ;

	totemip_totemip_to_sockaddr_convert(&member->member,
	instance->totem_interface->ip_port, &sockaddr, &addrlen);
	msg_mcast.msg_name = &sockaddr;
	msg_mcast.msg_namelen = addrlen;
	msg_mcast.msg_iov = (void *)&iovec;
	msg_mcast.msg_iovlen = 1;
	#ifdef HAVE_MSGHDR_CONTROL
	msg_mcast.msg_control = 0;
	#endif
	#ifdef HAVE_MSGHDR_CONTROLLEN
	msg_mcast.msg_controllen = 0;
	#endif
	#ifdef HAVE_MSGHDR_FLAGS
	msg_mcast.msg_flags = 0;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTS
	msg_mcast.msg_accrights = NULL;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTSLEN
	msg_mcast.msg_accrightslen = 0;
	#endif

	/*
	* Transmit multicast message
	* An error here is recovered by totemsrp
	*/
	res = sendmsg (member->fd, &msg_mcast, MSG_NOSIGNAL);
	if (res < 0) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_debug,
	"sendmsg(mcast) failed (non-critical)");
	}
	}

	if (!only_active \|\| instance->send_merge_detect_message) {
	/*
	* Current message was sent to all nodes
	*/
	instance->merge_detect_messages_sent_before_timeout++;
	instance->send_merge_detect_message = 0;
	}
	} else {
	/*
	* Transmit multicast message to local unix mcast loop
	* An error here is recovered by totemsrp
	*/
	msg_mcast.msg_name = NULL;
	msg_mcast.msg_namelen = 0;
	msg_mcast.msg_iov = (void *)&iovec;
	msg_mcast.msg_iovlen = 1;
	#ifdef HAVE_MSGHDR_CONTROL
	msg_mcast.msg_control = 0;
	#endif
	#ifdef HAVE_MSGHDR_CONTROLLEN
	msg_mcast.msg_controllen = 0;
	#endif
	#ifdef HAVE_MSGHDR_FLAGS
	msg_mcast.msg_flags = 0;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTS
	msg_mcast.msg_accrights = NULL;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTSLEN
	msg_mcast.msg_accrightslen = 0;
	#endif

	res = sendmsg (instance->local_loop_sock[1], &msg_mcast,
	MSG_NOSIGNAL);
	if (res < 0) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_debug,
	"sendmsg(local mcast loop) failed (non-critical)");
	}
	}
	}

	int totemudpu_finalize (
	void *udpu_context)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	int res = 0;

	if (instance->token_socket > 0) {
	qb_loop_poll_del (instance->totemudpu_poll_handle,
	instance->token_socket);
	close (instance->token_socket);
	}

	if (instance->local_loop_sock[0] > 0) {
	qb_loop_poll_del (instance->totemudpu_poll_handle,
	instance->local_loop_sock[0]);
	close (instance->local_loop_sock[0]);
	close (instance->local_loop_sock[1]);
	}

	totemudpu_stop_merge_detect_timeout(instance);

	return (res);
	}

	static struct totemudpu_member *find_member_by_sockaddr(
	const void *udpu_context,
	const struct sockaddr *sa)
	{
	struct qb_list_head *list;
	struct totemudpu_member *member;
	struct totemudpu_member *res_member;
	const struct totemudpu_instance instance = (const struct totemudpu_instance )udpu_context;

	res_member = NULL;

	qb_list_for_each(list, &(instance->member_list)) {
	member = qb_list_entry (list,
	struct totemudpu_member,
	list);

	if (totemip_sa_equal(&member->member, sa)) {
	res_member = member;
	break ;
	}
	}

	return (res_member);
	}


	static int net_deliver_fn (
	int fd,
	int revents,
	void *data)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )data;
	struct msghdr msg_recv;
	struct iovec *iovec;
	struct sockaddr_storage system_from;
	int bytes_received;
	int truncated_packet;

	iovec = &instance->totemudpu_iov_recv;

	/*
	* Receive datagram
	*/
	msg_recv.msg_name = &system_from;
	msg_recv.msg_namelen = sizeof (struct sockaddr_storage);
	msg_recv.msg_iov = iovec;
	msg_recv.msg_iovlen = 1;
	#ifdef HAVE_MSGHDR_CONTROL
	msg_recv.msg_control = 0;
	#endif
	#ifdef HAVE_MSGHDR_CONTROLLEN
	msg_recv.msg_controllen = 0;
	#endif
	#ifdef HAVE_MSGHDR_FLAGS
	msg_recv.msg_flags = 0;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTS
	msg_recv.msg_accrights = NULL;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTSLEN
	msg_recv.msg_accrightslen = 0;
	#endif

	bytes_received = recvmsg (fd, &msg_recv, MSG_NOSIGNAL \| MSG_DONTWAIT);
	if (bytes_received == -1) {
	return (0);
	} else {
	instance->stats_recv += bytes_received;
	}

	truncated_packet = 0;

	#ifdef HAVE_MSGHDR_FLAGS
	if (msg_recv.msg_flags & MSG_TRUNC) {
	truncated_packet = 1;
	}
	#else
	/*
	* We don't have MSGHDR_FLAGS, but we can (hopefully) safely make assumption that
	* if bytes_received == UDP_RECEIVE_FRAME_SIZE_MAX then packet is truncated
	*/
	if (bytes_received == UDP_RECEIVE_FRAME_SIZE_MAX) {
	truncated_packet = 1;
	}
	#endif

	if (truncated_packet) {
	log_printf (instance->totemudpu_log_level_error,
	"Received too big message. This may be because something bad is happening"
	"on the network (attack?), or you tried join more nodes than corosync is"
	"compiled with (%u) or bug in the code (bad estimation of "
	"the UDP_RECEIVE_FRAME_SIZE_MAX). Dropping packet.", PROCESSOR_COUNT_MAX);
	return (0);
	}

	if (instance->totem_config->block_unlisted_ips &&
	find_member_by_sockaddr(instance, (const struct sockaddr *)&system_from) == NULL) {
	log_printf(instance->totemudpu_log_level_debug, "Packet rejected from %s",
	totemip_sa_print((const struct sockaddr *)&system_from));

	return (0);
	}

	iovec->iov_len = bytes_received;

	/*
	* Handle incoming message
	*/
	instance->totemudpu_deliver_fn (
	instance->context,
	iovec->iov_base,
	iovec->iov_len,
	&system_from);

	iovec->iov_len = UDP_RECEIVE_FRAME_SIZE_MAX;
	return (0);
	}

	static int netif_determine (
	struct totemudpu_instance *instance,
	struct totem_ip_address *bindnet,
	struct totem_ip_address *bound_to,
	int *interface_up,
	int *interface_num)
	{
	int res;

	res = totemip_iface_check (bindnet, bound_to,
	interface_up, interface_num,
	instance->totem_config->clear_node_high_bit);


	return (res);
	}


	/*
	* If the interface is up, the sockets for totem are built. If the interface is down
	* this function is requeued in the timer list to retry building the sockets later.
	*/
	static void timer_function_netif_check_timeout (
	void *data)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )data;
	int interface_up;
	int interface_num;

	/*
	* Build sockets for every interface
	*/
	netif_determine (instance,
	&instance->totem_interface->bindnet,
	&instance->totem_interface->boundto,
	&interface_up, &interface_num);
	/*
	* If the network interface isn't back up and we are already
	* in loopback mode, add timer to check again and return
	*/
	if ((instance->netif_bind_state == BIND_STATE_LOOPBACK &&
	interface_up == 0) \|\|

	(instance->my_memb_entries == 1 &&
	instance->netif_bind_state == BIND_STATE_REGULAR &&
	interface_up == 1)) {

	qb_loop_timer_add (instance->totemudpu_poll_handle,
	QB_LOOP_MED,
	instance->totem_config->downcheck_timeout*QB_TIME_NS_IN_MSEC,
	(void *)instance,
	timer_function_netif_check_timeout,
	&instance->timer_netif_check_timeout);

	/*
	* Add a timer to check for a downed regular interface
	*/
	return;
	}

	if (instance->token_socket > 0) {
	qb_loop_poll_del (instance->totemudpu_poll_handle,
	instance->token_socket);
	close (instance->token_socket);
	instance->token_socket = -1;
	}

	if (interface_up == 0) {
	if (instance->netif_bind_state == BIND_STATE_UNBOUND) {
	log_printf (instance->totemudpu_log_level_error,
	"One of your ip addresses are now bound to localhost. "
	"Corosync would not work correctly.");
	exit(COROSYNC_DONE_FATAL_ERR);
	}

	/*
	* Interface is not up
	*/
	instance->netif_bind_state = BIND_STATE_LOOPBACK;

	/*
	* Add a timer to retry building interfaces and request memb_gather_enter
	*/
	qb_loop_timer_add (instance->totemudpu_poll_handle,
	QB_LOOP_MED,
	instance->totem_config->downcheck_timeout*QB_TIME_NS_IN_MSEC,
	(void *)instance,
	timer_function_netif_check_timeout,
	&instance->timer_netif_check_timeout);
	} else {
	/*
	* Interface is up
	*/
	instance->netif_bind_state = BIND_STATE_REGULAR;
	}
	/*
	* Create and bind the multicast and unicast sockets
	*/
	totemudpu_build_sockets (instance,
	&instance->totem_interface->bindnet,
	&instance->totem_interface->boundto);

	if (instance->netif_bind_state == BIND_STATE_REGULAR) {
	qb_loop_poll_add (instance->totemudpu_poll_handle,
	QB_LOOP_MED,
	instance->token_socket,
	POLLIN, instance, net_deliver_fn);
	}

	totemip_copy (&instance->my_id, &instance->totem_interface->boundto);

	/*
	* This reports changes in the interface to the user and totemsrp
	*/
	if (instance->netif_bind_state == BIND_STATE_REGULAR) {
	if (instance->netif_state_report & NETIF_STATE_REPORT_UP) {
	log_printf (instance->totemudpu_log_level_notice,
	"The network interface [%s] is now up.",
	totemip_print (&instance->totem_interface->boundto));
	instance->netif_state_report = NETIF_STATE_REPORT_DOWN;
	instance->totemudpu_iface_change_fn (instance->context, &instance->my_id, 0);
	}
	/*
	* Add a timer to check for interface going down in single membership
	*/
	if (instance->my_memb_entries == 1) {
	qb_loop_timer_add (instance->totemudpu_poll_handle,
	QB_LOOP_MED,
	instance->totem_config->downcheck_timeout*QB_TIME_NS_IN_MSEC,
	(void *)instance,
	timer_function_netif_check_timeout,
	&instance->timer_netif_check_timeout);
	}

	} else {
	if (instance->netif_state_report & NETIF_STATE_REPORT_DOWN) {
	log_printf (instance->totemudpu_log_level_notice,
	"The network interface is down.");
	instance->totemudpu_iface_change_fn (instance->context, &instance->my_id, 0);
	}
	instance->netif_state_report = NETIF_STATE_REPORT_UP;

	}
	}

	/* Set the socket priority to INTERACTIVE to ensure
	that our messages don't get queued behind anything else */
	static void totemudpu_traffic_control_set(struct totemudpu_instance *instance, int sock)
	{
	#ifdef SO_PRIORITY
	int prio = 6; /* TC_PRIO_INTERACTIVE */

	if (setsockopt(sock, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(int))) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"Could not set traffic priority");
	}
	#endif
	}

	static int totemudpu_build_sockets_ip (
	struct totemudpu_instance *instance,
	struct totem_ip_address *bindnet_address,
	struct totem_ip_address *bound_to,
	int interface_num)
	{
	struct sockaddr_storage sockaddr;
	int addrlen;
	int res;
	unsigned int recvbuf_size;
	unsigned int optlen = sizeof (recvbuf_size);
	unsigned int retries = 0;

	/*
	* Setup unicast socket
	*/
	instance->token_socket = socket (bindnet_address->family, SOCK_DGRAM, 0);
	if (instance->token_socket == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"socket() failed");
	return (-1);
	}

	totemip_nosigpipe (instance->token_socket);
	res = fcntl (instance->token_socket, F_SETFL, O_NONBLOCK);
	if (res == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"Could not set non-blocking operation on token socket");
	return (-1);
	}

	/*
	* Bind to unicast socket used for token send/receives
	* This has the side effect of binding to the correct interface
	*/
	totemip_totemip_to_sockaddr_convert(bound_to, instance->totem_interface->ip_port, &sockaddr, &addrlen);
	while (1) {
	res = bind (instance->token_socket, (struct sockaddr *)&sockaddr, addrlen);
	if (res == 0) {
	break;
	}
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"bind token socket failed");
	if (++retries > BIND_MAX_RETRIES) {
	break;
	}

	/*
	* Wait for a while
	*/
	(void)poll(NULL, 0, BIND_RETRIES_INTERVAL * retries);
	}

	if (res == -1) {
	return (-1);
	}

	/*
	* the token_socket can receive many messages. Allow a large number
	* of receive messages on this socket
	*/
	recvbuf_size = MCAST_SOCKET_BUFFER_SIZE;
	res = setsockopt (instance->token_socket, SOL_SOCKET, SO_RCVBUF,
	&recvbuf_size, optlen);
	if (res == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_notice,
	"Could not set recvbuf size");
	}

	return 0;
	}

	int totemudpu_ifaces_get (
	void *net_context,
	char ***status,
	unsigned int *iface_count)
	{
	static char statuses[INTERFACE_MAX] = {(char)"OK"};

	if (status) {
	*status = statuses;
	}
	*iface_count = 1;

	return (0);
	}


	static int totemudpu_build_local_sockets(
	struct totemudpu_instance *instance)
	{
	int i;
	unsigned int sendbuf_size;
	unsigned int recvbuf_size;
	unsigned int optlen = sizeof (sendbuf_size);
	int res;

	/*
	* Create local multicast loop socket
	*/
	if (socketpair(AF_UNIX, SOCK_DGRAM, 0, instance->local_loop_sock) == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"socket() failed");
	return (-1);
	}

	for (i = 0; i < 2; i++) {
	totemip_nosigpipe (instance->local_loop_sock[i]);
	res = fcntl (instance->local_loop_sock[i], F_SETFL, O_NONBLOCK);
	if (res == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"Could not set non-blocking operation on multicast socket");
	return (-1);
	}
	}

	recvbuf_size = MCAST_SOCKET_BUFFER_SIZE;
	sendbuf_size = MCAST_SOCKET_BUFFER_SIZE;

	res = setsockopt (instance->local_loop_sock[0], SOL_SOCKET, SO_RCVBUF, &recvbuf_size, optlen);
	if (res == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_debug,
	"Unable to set SO_RCVBUF size on UDP local mcast loop socket");
	return (-1);
	}
	res = setsockopt (instance->local_loop_sock[1], SOL_SOCKET, SO_SNDBUF, &sendbuf_size, optlen);
	if (res == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_debug,
	"Unable to set SO_SNDBUF size on UDP local mcast loop socket");
	return (-1);
	}

	res = getsockopt (instance->local_loop_sock[0], SOL_SOCKET, SO_RCVBUF, &recvbuf_size, &optlen);
	if (res == 0) {
	log_printf (instance->totemudpu_log_level_debug,
	"Local receive multicast loop socket recv buffer size (%d bytes).", recvbuf_size);
	}

	res = getsockopt (instance->local_loop_sock[1], SOL_SOCKET, SO_SNDBUF, &sendbuf_size, &optlen);
	if (res == 0) {
	log_printf (instance->totemudpu_log_level_debug,
	"Local transmit multicast loop socket send buffer size (%d bytes).", sendbuf_size);
	}

	return (0);
	}

	static int totemudpu_build_sockets (
	struct totemudpu_instance *instance,
	struct totem_ip_address *bindnet_address,
	struct totem_ip_address *bound_to)
	{
	int interface_num;
	int interface_up;
	int res;

	/*
	* Determine the ip address bound to and the interface name
	*/
	res = netif_determine (instance,
	bindnet_address,
	bound_to,
	&interface_up,
	&interface_num);

	if (res == -1) {
	return (-1);
	}

	totemip_copy(&instance->my_id, bound_to);

	res = totemudpu_build_sockets_ip (instance,
	bindnet_address, bound_to, interface_num);

	if (res == -1) {
	/* if we get here, corosync won't work anyway, so better leaving than faking to work */
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_error,
	"Unable to create sockets, exiting");
	exit(EXIT_FAILURE);
	}

	/* We only send out of the token socket */
	totemudpu_traffic_control_set(instance, instance->token_socket);

	/*
	* Rebind all members to new ips
	*/
	totemudpu_member_list_rebind_ip(instance);

	return res;
	}

	/*
	* Totem Network interface
	* depends on poll abstraction, POSIX, IPV4
	*/

	/*
	* Create an instance
	*/
	int totemudpu_initialize (
	qb_loop_t *poll_handle,
	void **udpu_context,
	struct totem_config *totem_config,
	totemsrp_stats_t *stats,
	void *context,

	void (*deliver_fn) (
	void *context,
	const void *msg,
	unsigned int msg_len,
	const struct sockaddr_storage *system_from),

	void (*iface_change_fn) (
	void *context,
	const struct totem_ip_address *iface_address,
	unsigned int ring_no),

	void (*mtu_changed) (
	void *context,
	int net_mtu),

	void (*target_set_completed) (
	void *context))
	{
	struct totemudpu_instance *instance;

	instance = malloc (sizeof (struct totemudpu_instance));
	if (instance == NULL) {
	return (-1);
	}

	totemudpu_instance_initialize (instance);

	instance->totem_config = totem_config;
	instance->stats = stats;

	/*
	* Configure logging
	*/
	instance->totemudpu_log_level_security = 1; //totem_config->totem_logging_configuration.log_level_security;
	instance->totemudpu_log_level_error = totem_config->totem_logging_configuration.log_level_error;
	instance->totemudpu_log_level_warning = totem_config->totem_logging_configuration.log_level_warning;
	instance->totemudpu_log_level_notice = totem_config->totem_logging_configuration.log_level_notice;
	instance->totemudpu_log_level_debug = totem_config->totem_logging_configuration.log_level_debug;
	instance->totemudpu_subsys_id = totem_config->totem_logging_configuration.log_subsys_id;
	instance->totemudpu_log_printf = totem_config->totem_logging_configuration.log_printf;

	/*
	* Initialize local variables for totemudpu
	*/
	instance->totem_interface = &totem_config->interfaces[0];
	memset (instance->iov_buffer, 0, UDP_RECEIVE_FRAME_SIZE_MAX);

	instance->totemudpu_poll_handle = poll_handle;

	instance->totem_interface->bindnet.nodeid = instance->totem_config->node_id;

	instance->context = context;
	instance->totemudpu_deliver_fn = deliver_fn;

	instance->totemudpu_iface_change_fn = iface_change_fn;

	instance->totemudpu_target_set_completed = target_set_completed;

	/*
	* Create static local mcast sockets
	*/
	if (totemudpu_build_local_sockets(instance) == -1) {
	free(instance);
	return (-1);
	}

	qb_loop_poll_add (
	instance->totemudpu_poll_handle,
	QB_LOOP_MED,
	instance->local_loop_sock[0],
	POLLIN, instance, net_deliver_fn);

	/*
	* RRP layer isn't ready to receive message because it hasn't
	* initialized yet. Add short timer to check the interfaces.
	*/
	qb_loop_timer_add (instance->totemudpu_poll_handle,
	QB_LOOP_MED,
	100*QB_TIME_NS_IN_MSEC,
	(void *)instance,
	timer_function_netif_check_timeout,
	&instance->timer_netif_check_timeout);

	totemudpu_start_merge_detect_timeout((void*)instance);

	*udpu_context = instance;
	return (0);
	}

	void *totemudpu_buffer_alloc (void)
	{
	return malloc (FRAME_SIZE_MAX);
	}

	void totemudpu_buffer_release (void *ptr)
	{
	return free (ptr);
	}

	int totemudpu_processor_count_set (
	void *udpu_context,
	int processor_count)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	int res = 0;

	instance->my_memb_entries = processor_count;
	qb_loop_timer_del (instance->totemudpu_poll_handle,
	instance->timer_netif_check_timeout);
	if (processor_count == 1) {
	qb_loop_timer_add (instance->totemudpu_poll_handle,
	QB_LOOP_MED,
	instance->totem_config->downcheck_timeout*QB_TIME_NS_IN_MSEC,
	(void *)instance,
	timer_function_netif_check_timeout,
	&instance->timer_netif_check_timeout);
	}

	return (res);
	}

	int totemudpu_recv_flush (void *udpu_context)
	{
	int res = 0;

	return (res);
	}

	int totemudpu_send_flush (void *udpu_context)
	{
	int res = 0;

	return (res);
	}

	int totemudpu_token_send (
	void *udpu_context,
	const void *msg,
	unsigned int msg_len)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	int res = 0;

	ucast_sendmsg (instance, &instance->token_target, msg, msg_len);

	return (res);
	}
	int totemudpu_mcast_flush_send (
	void *udpu_context,
	const void *msg,
	unsigned int msg_len)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	int res = 0;

	mcast_sendmsg (instance, msg, msg_len, 0);

	return (res);
	}

	int totemudpu_mcast_noflush_send (
	void *udpu_context,
	const void *msg,
	unsigned int msg_len)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	int res = 0;

	mcast_sendmsg (instance, msg, msg_len, 1);

	return (res);
	}

	extern int totemudpu_iface_check (void *udpu_context)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	int res = 0;

	timer_function_netif_check_timeout (instance);

	return (res);
	}

	extern void totemudpu_net_mtu_adjust (void udpu_context, struct totem_config totem_config)
	{
	totem_config->net_mtu -= totemip_udpip_header_size(totem_config->interfaces[0].bindnet.family);
	}


	int totemudpu_token_target_set (
	void *udpu_context,
	unsigned int nodeid)
	{

	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	struct qb_list_head *list;
	struct totemudpu_member *member;
	int res = 0;

	qb_list_for_each(list, &(instance->member_list)) {
	member = qb_list_entry (list,
	struct totemudpu_member,
	list);

	if (member->member.nodeid == nodeid) {
	memcpy (&instance->token_target, &member->member,
	sizeof (struct totem_ip_address));

	instance->totemudpu_target_set_completed (instance->context);
	break;
	}
	}
	return (res);
	}

	extern int totemudpu_recv_mcast_empty (
	void *udpu_context)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	unsigned int res;
	struct sockaddr_storage system_from;
	struct msghdr msg_recv;
	struct pollfd ufd;
	int nfds, i;
	int msg_processed = 0;
	int sock;

	/*
	* Receive datagram
	*/
	msg_recv.msg_name = &system_from;
	msg_recv.msg_namelen = sizeof (struct sockaddr_storage);
	msg_recv.msg_iov = &instance->totemudpu_iov_recv;
	msg_recv.msg_iovlen = 1;
	#ifdef HAVE_MSGHDR_CONTROL
	msg_recv.msg_control = 0;
	#endif
	#ifdef HAVE_MSGHDR_CONTROLLEN
	msg_recv.msg_controllen = 0;
	#endif
	#ifdef HAVE_MSGHDR_FLAGS
	msg_recv.msg_flags = 0;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTS
	msg_recv.msg_accrights = NULL;
	#endif
	#ifdef HAVE_MSGHDR_ACCRIGHTSLEN
	msg_recv.msg_accrightslen = 0;
	#endif

	for (i = 0; i < 2; i++) {
	sock = -1;
	if (i == 0) {
	if (instance->netif_bind_state == BIND_STATE_REGULAR) {
	sock = instance->token_socket;
	} else {
	continue;
	}
	}
	if (i == 1) {
	sock = instance->local_loop_sock[0];
	}
	assert(sock != -1);

	do {
	ufd.fd = sock;
	ufd.events = POLLIN;
	nfds = poll (&ufd, 1, 0);
	if (nfds == 1 && ufd.revents & POLLIN) {
	res = recvmsg (sock, &msg_recv, MSG_NOSIGNAL \| MSG_DONTWAIT);
	if (res != -1) {
	msg_processed = 1;
	} else {
	msg_processed = -1;
	}
	}
	} while (nfds == 1);
	}

	return (msg_processed);
	}

	static int totemudpu_create_sending_socket(
	void *udpu_context,
	const struct totem_ip_address *member)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;
	int fd;
	int res;
	unsigned int sendbuf_size;
	unsigned int optlen = sizeof (sendbuf_size);
	struct sockaddr_storage sockaddr;
	int addrlen;

	fd = socket (member->family, SOCK_DGRAM, 0);
	if (fd == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"Could not create socket for new member");
	return (-1);
	}
	totemip_nosigpipe (fd);
	res = fcntl (fd, F_SETFL, O_NONBLOCK);
	if (res == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"Could not set non-blocking operation on token socket");
	goto error_close_fd;
	}

	/*
	* These sockets are used to send multicast messages, so their buffers
	* should be large
	*/
	sendbuf_size = MCAST_SOCKET_BUFFER_SIZE;
	res = setsockopt (fd, SOL_SOCKET, SO_SNDBUF,
	&sendbuf_size, optlen);
	if (res == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_notice,
	"Could not set sendbuf size");
	/*
	* Fail in setting sendbuf size is not fatal -> don't exit
	*/
	}

	/*
	* Bind to sending interface
	*/
	totemip_totemip_to_sockaddr_convert(&instance->my_id, 0, &sockaddr, &addrlen);
	res = bind (fd, (struct sockaddr *)&sockaddr, addrlen);
	if (res == -1) {
	LOGSYS_PERROR (errno, instance->totemudpu_log_level_warning,
	"bind token socket failed");
	goto error_close_fd;
	}

	return (fd);

	error_close_fd:
	close(fd);
	return (-1);
	}

	int totemudpu_iface_set (void *net_context,
	const struct totem_ip_address *local_addr,
	unsigned short ip_port,
	unsigned int iface_no)
	{
	/* Not supported */
	return (-1);
	}

	int totemudpu_member_add (
	void *udpu_context,
	const struct totem_ip_address *local,
	const struct totem_ip_address *member,
	int ring_no)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;

	struct totemudpu_member *new_member;

	new_member = malloc (sizeof (struct totemudpu_member));
	if (new_member == NULL) {
	return (-1);
	}

	memset(new_member, 0, sizeof(*new_member));

	log_printf (LOGSYS_LEVEL_NOTICE, "adding new UDPU member {%s}",
	totemip_print(member));
	qb_list_init (&new_member->list);
	qb_list_add_tail (&new_member->list, &instance->member_list);
	memcpy (&new_member->member, member, sizeof (struct totem_ip_address));
	new_member->fd = totemudpu_create_sending_socket(udpu_context, member);
	new_member->active = 1;

	return (0);
	}

	int totemudpu_member_remove (
	void *udpu_context,
	const struct totem_ip_address *token_target,
	int ring_no)
	{
	int found = 0;
	struct qb_list_head *list;
	struct totemudpu_member *member;

	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;

	/*
	* Find the member to remove and close its socket
	*/
	qb_list_for_each(list, &(instance->member_list)) {
	member = qb_list_entry (list,
	struct totemudpu_member,
	list);

	if (totemip_compare (token_target, &member->member)==0) {
	log_printf(LOGSYS_LEVEL_NOTICE,
	"removing UDPU member {%s}",
	totemip_print(&member->member));

	if (member->fd > 0) {
	log_printf(LOGSYS_LEVEL_DEBUG,
	"Closing socket to: {%s}",
	totemip_print(&member->member));
	qb_loop_poll_del (instance->totemudpu_poll_handle,
	member->fd);
	close (member->fd);
	}
	found = 1;
	break;
	}
	}

	/*
	* Delete the member from the list
	*/
	if (found) {
	qb_list_del (list);
	}

	instance = NULL;
	return (0);
	}

	int totemudpu_member_list_rebind_ip (
	void *udpu_context)
	{
	struct qb_list_head *list;
	struct totemudpu_member *member;

	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;

	qb_list_for_each(list, &(instance->member_list)) {
	member = qb_list_entry (list,
	struct totemudpu_member,
	list);

	if (member->fd > 0) {
	close (member->fd);
	}

	member->fd = totemudpu_create_sending_socket(udpu_context, &member->member);
	}

	return (0);
	}


	static void timer_function_merge_detect_timeout (
	void *data)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )data;

	if (instance->merge_detect_messages_sent_before_timeout == 0) {
	instance->send_merge_detect_message = 1;
	}

	instance->merge_detect_messages_sent_before_timeout = 0;

	totemudpu_start_merge_detect_timeout(instance);
	}

	static void totemudpu_start_merge_detect_timeout(
	void *udpu_context)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;

	qb_loop_timer_add(instance->totemudpu_poll_handle,
	QB_LOOP_MED,
	instance->totem_config->merge_timeout * 2 * QB_TIME_NS_IN_MSEC,
	(void *)instance,
	timer_function_merge_detect_timeout,
	&instance->timer_merge_detect_timeout);

	}

	static void totemudpu_stop_merge_detect_timeout(
	void *udpu_context)
	{
	struct totemudpu_instance instance = (struct totemudpu_instance )udpu_context;

	qb_loop_timer_del(instance->totemudpu_poll_handle,
	instance->timer_merge_detect_timeout);
	}

	int totemudpu_reconfigure (
	void *udpu_context,
	struct totem_config *totem_config)
	{
	/* Not supported */
	return (-1);
	}

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