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	diff --git a/libknet/internals.h b/libknet/internals.h
	index d33646f7..106b49db 100644
	--- a/libknet/internals.h
	+++ b/libknet/internals.h
	@@ -1,528 +1,559 @@
	/*
	* Copyright (C) 2010-2019 Red Hat, Inc. All rights reserved.
	*
	* Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
	* Federico Simoncelli <fsimon@kronosnet.org>
	*
	* This software licensed under GPL-2.0+, LGPL-2.0+
	*/

	#ifndef __KNET_INTERNALS_H__
	#define __KNET_INTERNALS_H__

	/*
	* NOTE: you shouldn't need to include this header normally
	*/

	#include <pthread.h>
	#include "libknet.h"
	#include "onwire.h"
	#include "compat.h"
	#include "threads_common.h"

	#define KNET_DATABUFSIZE KNET_MAX_PACKET_SIZE + KNET_HEADER_ALL_SIZE

	#define KNET_DATABUFSIZE_CRYPT_PAD 1024
	#define KNET_DATABUFSIZE_CRYPT KNET_DATABUFSIZE + KNET_DATABUFSIZE_CRYPT_PAD

	#define KNET_DATABUFSIZE_COMPRESS_PAD 1024
	#define KNET_DATABUFSIZE_COMPRESS KNET_DATABUFSIZE + KNET_DATABUFSIZE_COMPRESS_PAD

	#define KNET_RING_RCVBUFF 8388608

	#define PCKT_FRAG_MAX UINT8_MAX
	#define PCKT_RX_BUFS 512

	#define KNET_EPOLL_MAX_EVENTS KNET_DATAFD_MAX

	typedef void knet_transport_link_t; / per link transport handle */
	typedef void knet_transport_t; / per knet_h transport handle */
	struct knet_transport_ops; /* Forward because of circular dependancy */

	struct knet_mmsghdr {
	struct msghdr msg_hdr; /* Message header */
	unsigned int msg_len; /* Number of bytes transmitted */
	};

	struct knet_link {
	/* required */
	struct sockaddr_storage src_addr;
	struct sockaddr_storage dst_addr;
	/* configurable */
	unsigned int dynamic; /* see KNET_LINK_DYN_ define above */
	uint8_t priority; /* higher priority == preferred for A/P */
	unsigned long long ping_interval; /* interval */
	unsigned long long pong_timeout; /* timeout */
	unsigned long long pong_timeout_adj; /* timeout adjusted for latency */
	uint8_t pong_timeout_backoff; /* see link.h for definition */
	unsigned int latency_fix; /* precision */
	uint8_t pong_count; /* how many ping/pong to send/receive before link is up */
	uint64_t flags;
	/* status */
	struct knet_link_status status;
	/* internals */
	uint8_t link_id;
	uint8_t transport_type; /* #defined constant from API */
	knet_transport_link_t transport_link; /* link_info_t from transport */
	int outsock;
	unsigned int configured:1; /* set to 1 if src/dst have been configured transport initialized on this link*/
	unsigned int transport_connected:1; /* set to 1 if lower level transport is connected */
	unsigned int latency_exp;
	uint8_t received_pong;
	struct timespec ping_last;
	/* used by PMTUD thread as temp per-link variables and should always contain the onwire_len value! */
	uint32_t proto_overhead;
	struct timespec pmtud_last;
	uint32_t last_ping_size;
	uint32_t last_good_mtu;
	uint32_t last_bad_mtu;
	uint32_t last_sent_mtu;
	uint32_t last_recv_mtu;
	uint8_t has_valid_mtu;
	};

	#define KNET_CBUFFER_SIZE 4096

	struct knet_host_defrag_buf {
	char buf[KNET_DATABUFSIZE];
	uint8_t in_use; /* 0 buffer is free, 1 is in use */
	seq_num_t pckt_seq; /* identify the pckt we are receiving */
	uint8_t frag_recv; /* how many frags did we receive */
	uint8_t frag_map[PCKT_FRAG_MAX];/* bitmap of what we received? */
	uint8_t last_first; /* special case if we receive the last fragment first */
	uint16_t frag_size; /* normal frag size (not the last one) */
	uint16_t last_frag_size; /* the last fragment might not be aligned with MTU size */
	struct timespec last_update; /* keep time of the last pckt */
	};

	struct knet_host {
	/* required */
	knet_node_id_t host_id;
	/* configurable */
	uint8_t link_handler_policy;
	char name[KNET_MAX_HOST_LEN];
	/* status */
	struct knet_host_status status;
	/* internals */
	char circular_buffer[KNET_CBUFFER_SIZE];
	seq_num_t rx_seq_num;
	seq_num_t untimed_rx_seq_num;
	seq_num_t timed_rx_seq_num;
	uint8_t got_data;
	/* defrag/reassembly buffers */
	struct knet_host_defrag_buf defrag_buf[KNET_MAX_LINK];
	char circular_buffer_defrag[KNET_CBUFFER_SIZE];
	/* link stuff */
	struct knet_link link[KNET_MAX_LINK];
	uint8_t active_link_entries;
	uint8_t active_links[KNET_MAX_LINK];
	struct knet_host *next;
	};

	struct knet_sock {
	int sockfd[2]; /* sockfd[0] will always be application facing
	* and sockfd[1] internal if sockpair has been created by knet */
	int is_socket; /* check if it's a socket for recvmmsg usage */
	int is_created; /* knet created this socket and has to clean up on exit/del */
	int in_use; /* set to 1 if it's use, 0 if free */
	int has_error; /* set to 1 if there were errors reading from the sock
	* and socket has been removed from epoll */
	};

	struct knet_fd_trackers {
	uint8_t transport; /* transport type (UDP/SCTP...) */
	uint8_t data_type; /* internal use for transport to define what data are associated
	* to this fd */
	void data; / pointer to the data */
	};

	#define KNET_MAX_FDS KNET_MAX_HOST * KNET_MAX_LINK * 4

	#define KNET_MAX_COMPRESS_METHODS UINT8_MAX

	struct knet_handle_stats_extra {
	uint64_t tx_crypt_pmtu_packets;
	uint64_t tx_crypt_pmtu_reply_packets;
	uint64_t tx_crypt_ping_packets;
	uint64_t tx_crypt_pong_packets;
	};

	struct knet_handle {
	knet_node_id_t host_id;
	unsigned int enabled:1;
	struct knet_sock sockfd[KNET_DATAFD_MAX];
	int logfd;
	uint8_t log_levels[KNET_MAX_SUBSYSTEMS];
	int hostsockfd[2];
	int dstsockfd[2];
	int send_to_links_epollfd;
	int recv_from_links_epollfd;
	int dst_link_handler_epollfd;
	uint8_t use_access_lists; /* set to 0 for disable, 1 for enable */
	unsigned int pmtud_interval;
	unsigned int data_mtu; /* contains the max data size that we can send onwire
	* without frags */
	struct knet_host *host_head;
	struct knet_host *host_index[KNET_MAX_HOST];
	knet_transport_t transports[KNET_MAX_TRANSPORTS+1];
	struct knet_fd_trackers knet_transport_fd_tracker[KNET_MAX_FDS]; /* track status for each fd handled by transports */
	struct knet_handle_stats stats;
	struct knet_handle_stats_extra stats_extra;
	uint32_t reconnect_int;
	knet_node_id_t host_ids[KNET_MAX_HOST];
	size_t host_ids_entries;
	struct knet_header *recv_from_sock_buf;
	struct knet_header *send_to_links_buf[PCKT_FRAG_MAX];
	struct knet_header *recv_from_links_buf[PCKT_RX_BUFS];
	struct knet_header *pingbuf;
	struct knet_header *pmtudbuf;
	uint8_t threads_status[KNET_THREAD_MAX];
	pthread_mutex_t threads_status_mutex;
	pthread_t send_to_links_thread;
	pthread_t recv_from_links_thread;
	pthread_t heartbt_thread;
	pthread_t dst_link_handler_thread;
	pthread_t pmtud_link_handler_thread;
	pthread_rwlock_t global_rwlock; /* global config lock */
	pthread_mutex_t pmtud_mutex; /* pmtud mutex to handle conditional send/recv + timeout */
	pthread_cond_t pmtud_cond; /* conditional for above */
	pthread_mutex_t tx_mutex; /* used to protect knet_send_sync and TX thread */
	pthread_mutex_t hb_mutex; /* used to protect heartbeat thread and seq_num broadcasting */
	pthread_mutex_t backoff_mutex; /* used to protect dst_link->pong_timeout_adj */
	pthread_mutex_t kmtu_mutex; /* used to protect kernel_mtu */
	uint32_t kernel_mtu; /* contains the MTU detected by the kernel on a given link */
	int pmtud_waiting;
	int pmtud_running;
	int pmtud_forcerun;
	int pmtud_abort;
	struct crypto_instance *crypto_instance;
	size_t sec_header_size;
	size_t sec_block_size;
	size_t sec_hash_size;
	size_t sec_salt_size;
	unsigned char *send_to_links_buf_crypt[PCKT_FRAG_MAX];
	unsigned char *recv_from_links_buf_crypt;
	unsigned char *recv_from_links_buf_decrypt;
	unsigned char *pingbuf_crypt;
	unsigned char *pmtudbuf_crypt;
	int compress_model;
	int compress_level;
	size_t compress_threshold;
	void compress_int_data[KNET_MAX_COMPRESS_METHODS]; / for compress method private data */
	unsigned char *recv_from_links_buf_decompress;
	unsigned char *send_to_links_buf_compress;
	seq_num_t tx_seq_num;
	pthread_mutex_t tx_seq_num_mutex;
	uint8_t has_loop_link;
	uint8_t loop_link;
	void *dst_host_filter_fn_private_data;
	int (*dst_host_filter_fn) (
	void *private_data,
	const unsigned char *outdata,
	ssize_t outdata_len,
	uint8_t tx_rx,
	knet_node_id_t this_host_id,
	knet_node_id_t src_node_id,
	int8_t *channel,
	knet_node_id_t *dst_host_ids,
	size_t *dst_host_ids_entries);
	void *pmtud_notify_fn_private_data;
	void (*pmtud_notify_fn) (
	void *private_data,
	unsigned int data_mtu);
	void *host_status_change_notify_fn_private_data;
	void (*host_status_change_notify_fn) (
	void *private_data,
	knet_node_id_t host_id,
	uint8_t reachable,
	uint8_t remote,
	uint8_t external);
	void *sock_notify_fn_private_data;
	void (*sock_notify_fn) (
	void *private_data,
	int datafd,
	int8_t channel,
	uint8_t tx_rx,
	int error,
	int errorno);
	int fini_in_progress;
	uint64_t flags;
	};

	extern pthread_rwlock_t shlib_rwlock; /* global shared lib load lock */

	/*
	* NOTE: every single operation must be implementend
	* for every protocol.
	*/

	+/*
	+ * for now knet supports only IP protocols (udp/sctp)
	+ * in future there might be others like ARP
	+ * or TIPC.
	+ * keep this around as transport information
	+ * to use for access lists and other operations
	+ */
	+
	+typedef enum {
	+ LOOPBACK,
	+ IP_PROTO
	+} transport_proto;
	+
	+/*
	+ * some transports like SCTP can filter incoming
	+ * connections before knet has to process
	+ * any packets.
	+ * GENERIC_ACL -> packet has to be read and filterted
	+ * PROTO_ACL -> transport provides filtering at lower levels
	+ * and packet does not need to be processed
	+ */
	+
	+typedef enum {
	+ USE_NO_ACL,
	+ USE_GENERIC_ACL,
	+ USE_PROTO_ACL
	+} transport_acl;
	+
	/*
	* make it easier to map values in transports.c
	*/
	#define TRANSPORT_PROTO_NOT_CONNECTION_ORIENTED 0
	#define TRANSPORT_PROTO_IS_CONNECTION_ORIENTED 1

	typedef struct knet_transport_ops {
	/*
	* transport generic information
	*/
	const char *transport_name;
	const uint8_t transport_id;
	const uint8_t built_in;

	+ transport_proto transport_protocol;
	+ transport_acl transport_acl_type;
	+
	/*
	* connection oriented protocols like SCTP
	* don´t need dst_addr in sendto calls and
	* on some OSes are considered EINVAL.
	*/
	uint8_t transport_is_connection_oriented;

	uint32_t transport_mtu_overhead;
	/*
	* transport init must allocate the new transport
	* and perform all internal initializations
	* (threads, lists, etc).
	*/
	int (*transport_init)(knet_handle_t knet_h);
	/*
	* transport free must releases _all_ resources
	* allocated by tranport_init
	*/
	int (*transport_free)(knet_handle_t knet_h);

	/*
	* link operations should take care of all the
	* sockets and epoll management for a given link/transport set
	* transport_link_disable should return err = -1 and errno = EBUSY
	* if listener is still in use, and any other errno in case
	* the link cannot be disabled.
	*
	* set_config/clear_config are invoked in global write lock context
	*/
	int (transport_link_set_config)(knet_handle_t knet_h, struct knet_link link);
	int (transport_link_clear_config)(knet_handle_t knet_h, struct knet_link link);

	/*
	* transport callback for incoming dynamic connections
	* this is called in global read lock context
	*/
	int (transport_link_dyn_connect)(knet_handle_t knet_h, int sockfd, struct knet_link link);

	/*
	* per transport error handling of recvmmsg
	* (see _handle_recv_from_links comments for details)
	*/

	/*
	* transport_rx_sock_error is invoked when recvmmsg returns <= 0
	*
	* transport_rx_sock_error is invoked with both global_rdlock
	*/

	int (*transport_rx_sock_error)(knet_handle_t knet_h, int sockfd, int recv_err, int recv_errno);

	/*
	* transport_tx_sock_error is invoked with global_rwlock and
	* it's invoked when sendto or sendmmsg returns =< 0
	*
	* it should return:
	* -1 on internal error
	* 0 ignore error and continue
	* 1 retry
	* any sleep or wait action should happen inside the transport code
	*/
	int (*transport_tx_sock_error)(knet_handle_t knet_h, int sockfd, int recv_err, int recv_errno);

	/*
	* this function is called on _every_ received packet
	* to verify if the packet is data or internal protocol error handling
	*
	* it should return:
	* -1 on error
	* 0 packet is not data and we should continue the packet process loop
	* 1 packet is not data and we should STOP the packet process loop
	* 2 packet is data and should be parsed as such
	*
	* transport_rx_is_data is invoked with both global_rwlock
	* and fd_tracker read lock (from RX thread)
	*/
	int (transport_rx_is_data)(knet_handle_t knet_h, int sockfd, struct knet_mmsghdr msg);
	} knet_transport_ops_t;

	socklen_t sockaddr_len(const struct sockaddr_storage *ss);

	struct pretty_names {
	const char *name;
	uint8_t val;
	};

	/**
	* This is a kernel style list implementation.
	*
	* @author Steven Dake <sdake@redhat.com>
	*/

	struct knet_list_head {
	struct knet_list_head *next;
	struct knet_list_head *prev;
	};

	/**
	* @def KNET_LIST_DECLARE()
	* Declare and initialize a list head.
	*/
	#define KNET_LIST_DECLARE(name) \
	struct knet_list_head name = { &(name), &(name) }

	#define KNET_INIT_LIST_HEAD(ptr) do { \
	(ptr)->next = (ptr); (ptr)->prev = (ptr); \
	} while (0)

	/**
	* Initialize the list entry.
	*
	* Points next and prev pointers to head.
	* @param head pointer to the list head
	*/
	static inline void knet_list_init(struct knet_list_head *head)
	{
	head->next = head;
	head->prev = head;
	}

	/**
	* Add this element to the list.
	*
	* @param element the new element to insert.
	* @param head pointer to the list head
	*/
	static inline void knet_list_add(struct knet_list_head *element,
	struct knet_list_head *head)
	{
	head->next->prev = element;
	element->next = head->next;
	element->prev = head;
	head->next = element;
	}

	/**
	* Add to the list (but at the end of the list).
	*
	* @param element pointer to the element to add
	* @param head pointer to the list head
	* @see knet_list_add()
	*/
	static inline void knet_list_add_tail(struct knet_list_head *element,
	struct knet_list_head *head)
	{
	head->prev->next = element;
	element->next = head;
	element->prev = head->prev;
	head->prev = element;
	}

	/**
	* Delete an entry from the list.
	*
	* @param _remove the list item to remove
	*/
	static inline void knet_list_del(struct knet_list_head *_remove)
	{
	_remove->next->prev = _remove->prev;
	_remove->prev->next = _remove->next;
	}

	/**
	* Replace old entry by new one
	* @param old: the element to be replaced
	* @param new: the new element to insert
	*/
	static inline void knet_list_replace(struct knet_list_head *old,
	struct knet_list_head *new)
	{
	new->next = old->next;
	new->next->prev = new;
	new->prev = old->prev;
	new->prev->next = new;
	}

	/**
	* Tests whether list is the last entry in list head
	* @param list: the entry to test
	* @param head: the head of the list
	* @return boolean true/false
	*/
	static inline int knet_list_is_last(const struct knet_list_head *list,
	const struct knet_list_head *head)
	{
	return list->next == head;
	}

	/**
	* A quick test to see if the list is empty (pointing to it's self).
	* @param head pointer to the list head
	* @return boolean true/false
	*/
	static inline int32_t knet_list_empty(const struct knet_list_head *head)
	{
	return head->next == head;
	}


	/**
	* Get the struct for this entry
	* @param ptr: the &struct list_head pointer.
	* @param type: the type of the struct this is embedded in.
	* @param member: the name of the list_struct within the struct.
	*/
	#define knet_list_entry(ptr,type,member)\
	((type )((char )(ptr)-(char)(&((type )0)->member)))

	/**
	* Get the first element from a list
	* @param ptr: the &struct list_head pointer.
	* @param type: the type of the struct this is embedded in.
	* @param member: the name of the list_struct within the struct.
	*/
	#define knet_list_first_entry(ptr, type, member) \
	knet_list_entry((ptr)->next, type, member)

	/**
	* Iterate over a list
	* @param pos: the &struct list_head to use as a loop counter.
	* @param head: the head for your list.
	*/
	#define knet_list_for_each(pos, head) \
	for (pos = (head)->next; pos != (head); pos = pos->next)

	/**
	* Iterate over a list backwards
	* @param pos: the &struct list_head to use as a loop counter.
	* @param head: the head for your list.
	*/
	#define knet_list_for_each_reverse(pos, head) \
	for (pos = (head)->prev; pos != (head); pos = pos->prev)

	/**
	* Iterate over a list safe against removal of list entry
	* @param pos: the &struct list_head to use as a loop counter.
	* @param n: another &struct list_head to use as temporary storage
	* @param head: the head for your list.
	*/
	#define knet_list_for_each_safe(pos, n, head) \
	for (pos = (head)->next, n = pos->next; pos != (head); \
	pos = n, n = pos->next)

	/**
	* Iterate over list of given type
	* @param pos: the type * to use as a loop counter.
	* @param head: the head for your list.
	* @param member: the name of the list_struct within the struct.
	*/
	#define knet_list_for_each_entry(pos, head, member) \
	for (pos = knet_list_entry((head)->next, typeof(*pos), member); \
	&pos->member != (head); \
	pos = knet_list_entry(pos->member.next, typeof(*pos), member))


	#endif
	diff --git a/libknet/transports.c b/libknet/transports.c
	index b6f3b646..ffebe001 100644
	--- a/libknet/transports.c
	+++ b/libknet/transports.c
	@@ -1,277 +1,287 @@
	/*
	* Copyright (C) 2017-2019 Red Hat, Inc. All rights reserved.
	*
	* Author: Fabio M. Di Nitto <fabbione@kronosnet.org>
	*
	* This software licensed under GPL-2.0+, LGPL-2.0+
	*/

	#include "config.h"

	#include <unistd.h>
	#include <string.h>
	#include <errno.h>
	#include <pthread.h>
	#include <sys/types.h>
	#include <sys/socket.h>

	#include "libknet.h"
	#include "compat.h"
	#include "host.h"
	#include "link.h"
	#include "logging.h"
	#include "common.h"
	#include "transports.h"
	#include "transport_loopback.h"
	#include "transport_udp.h"
	#include "transport_sctp.h"
	#include "threads_common.h"

	-#define empty_module 0, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
	+#define empty_module -1, -1, 0, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL },

	static knet_transport_ops_t transport_modules_cmd[KNET_MAX_TRANSPORTS] = {
	- { "LOOPBACK", KNET_TRANSPORT_LOOPBACK, 1, TRANSPORT_PROTO_NOT_CONNECTION_ORIENTED, KNET_PMTUD_LOOPBACK_OVERHEAD, loopback_transport_init, loopback_transport_free, loopback_transport_link_set_config, loopback_transport_link_clear_config, loopback_transport_link_dyn_connect, loopback_transport_rx_sock_error, loopback_transport_tx_sock_error, loopback_transport_rx_is_data },
	- { "UDP", KNET_TRANSPORT_UDP, 1, TRANSPORT_PROTO_NOT_CONNECTION_ORIENTED, KNET_PMTUD_UDP_OVERHEAD, udp_transport_init, udp_transport_free, udp_transport_link_set_config, udp_transport_link_clear_config, udp_transport_link_dyn_connect, udp_transport_rx_sock_error, udp_transport_tx_sock_error, udp_transport_rx_is_data },
	+ { "LOOPBACK", KNET_TRANSPORT_LOOPBACK, 1, LOOPBACK, USE_NO_ACL, TRANSPORT_PROTO_NOT_CONNECTION_ORIENTED, KNET_PMTUD_LOOPBACK_OVERHEAD, loopback_transport_init, loopback_transport_free, loopback_transport_link_set_config, loopback_transport_link_clear_config, loopback_transport_link_dyn_connect, loopback_transport_rx_sock_error, loopback_transport_tx_sock_error, loopback_transport_rx_is_data },
	+ { "UDP", KNET_TRANSPORT_UDP, 1, IP_PROTO, USE_GENERIC_ACL, TRANSPORT_PROTO_NOT_CONNECTION_ORIENTED, KNET_PMTUD_UDP_OVERHEAD, udp_transport_init, udp_transport_free, udp_transport_link_set_config, udp_transport_link_clear_config, udp_transport_link_dyn_connect, udp_transport_rx_sock_error, udp_transport_tx_sock_error, udp_transport_rx_is_data },
	{ "SCTP", KNET_TRANSPORT_SCTP,
	#ifdef HAVE_NETINET_SCTP_H
	- 1, TRANSPORT_PROTO_IS_CONNECTION_ORIENTED, KNET_PMTUD_SCTP_OVERHEAD, sctp_transport_init, sctp_transport_free, sctp_transport_link_set_config, sctp_transport_link_clear_config, sctp_transport_link_dyn_connect, sctp_transport_rx_sock_error, sctp_transport_tx_sock_error, sctp_transport_rx_is_data },
	+ 1, IP_PROTO, USE_PROTO_ACL, TRANSPORT_PROTO_IS_CONNECTION_ORIENTED, KNET_PMTUD_SCTP_OVERHEAD, sctp_transport_init, sctp_transport_free, sctp_transport_link_set_config, sctp_transport_link_clear_config, sctp_transport_link_dyn_connect, sctp_transport_rx_sock_error, sctp_transport_tx_sock_error, sctp_transport_rx_is_data },
	#else
	empty_module
	#endif
	{ NULL, KNET_MAX_TRANSPORTS, empty_module
	};

	/*
	* transport wrappers
	*/

	int start_all_transports(knet_handle_t knet_h)
	{
	int idx = 0, savederrno = 0, err = 0;

	while (transport_modules_cmd[idx].transport_name != NULL) {
	if (transport_modules_cmd[idx].built_in) {
	if (transport_modules_cmd[idx].transport_init(knet_h) < 0) {
	savederrno = errno;
	log_err(knet_h, KNET_SUB_HANDLE,
	"Failed to allocate transport handle for %s: %s",
	transport_modules_cmd[idx].transport_name,
	strerror(savederrno));
	err = -1;
	goto out;
	}
	}
	idx++;
	}

	out:
	errno = savederrno;
	return err;
	}

	void stop_all_transports(knet_handle_t knet_h)
	{
	int idx = 0;

	while (transport_modules_cmd[idx].transport_name != NULL) {
	if (transport_modules_cmd[idx].built_in) {
	transport_modules_cmd[idx].transport_free(knet_h);
	}
	idx++;
	}
	}

	int transport_link_set_config(knet_handle_t knet_h, struct knet_link *kn_link, uint8_t transport)
	{
	if (!transport_modules_cmd[transport].built_in) {
	errno = EINVAL;
	return -1;
	}
	kn_link->transport_connected = 0;
	kn_link->transport_type = transport;
	kn_link->proto_overhead = transport_modules_cmd[transport].transport_mtu_overhead;
	return transport_modules_cmd[transport].transport_link_set_config(knet_h, kn_link);
	}

	int transport_link_clear_config(knet_handle_t knet_h, struct knet_link *kn_link)
	{
	return transport_modules_cmd[kn_link->transport_type].transport_link_clear_config(knet_h, kn_link);
	}

	int transport_link_dyn_connect(knet_handle_t knet_h, int sockfd, struct knet_link *kn_link)
	{
	return transport_modules_cmd[kn_link->transport_type].transport_link_dyn_connect(knet_h, sockfd, kn_link);
	}

	int transport_rx_sock_error(knet_handle_t knet_h, uint8_t transport, int sockfd, int recv_err, int recv_errno)
	{
	return transport_modules_cmd[transport].transport_rx_sock_error(knet_h, sockfd, recv_err, recv_errno);
	}

	int transport_tx_sock_error(knet_handle_t knet_h, uint8_t transport, int sockfd, int recv_err, int recv_errno)
	{
	return transport_modules_cmd[transport].transport_tx_sock_error(knet_h, sockfd, recv_err, recv_errno);
	}

	int transport_rx_is_data(knet_handle_t knet_h, uint8_t transport, int sockfd, struct knet_mmsghdr *msg)
	{
	return transport_modules_cmd[transport].transport_rx_is_data(knet_h, sockfd, msg);
	}

	+int transport_get_proto(knet_handle_t knet_h, uint8_t transport)
	+{
	+ return transport_modules_cmd[transport].transport_protocol;
	+}
	+
	+int transport_get_acl_type(knet_handle_t knet_h, uint8_t transport)
	+{
	+ return transport_modules_cmd[transport].transport_acl_type;
	+}
	+
	int transport_get_connection_oriented(knet_handle_t knet_h, uint8_t transport)
	{
	return transport_modules_cmd[transport].transport_is_connection_oriented;
	}

	/*
	* public api
	*/

	int knet_get_transport_list(struct knet_transport_info *transport_list,
	size_t *transport_list_entries)
	{
	int err = 0;
	int idx = 0;
	int outidx = 0;

	if (!transport_list_entries) {
	errno = EINVAL;
	return -1;
	}

	while (transport_modules_cmd[idx].transport_name != NULL) {
	if (transport_modules_cmd[idx].built_in) {
	if (transport_list) {
	transport_list[outidx].name = transport_modules_cmd[idx].transport_name;
	transport_list[outidx].id = transport_modules_cmd[idx].transport_id;
	}
	outidx++;
	}
	idx++;
	}

	*transport_list_entries = outidx;

	if (!err)
	errno = 0;
	return err;
	}

	const char *knet_get_transport_name_by_id(uint8_t transport)
	{
	int savederrno = 0;
	const char *name = NULL;

	if (transport == KNET_MAX_TRANSPORTS) {
	errno = EINVAL;
	return name;
	}

	if ((transport_modules_cmd[transport].transport_name) &&
	(transport_modules_cmd[transport].built_in)) {
	name = transport_modules_cmd[transport].transport_name;
	} else {
	savederrno = ENOENT;
	}

	errno = name ? 0 : savederrno;
	return name;
	}

	uint8_t knet_get_transport_id_by_name(const char *name)
	{
	int savederrno = 0;
	uint8_t err = KNET_MAX_TRANSPORTS;
	int i, found;

	if (!name) {
	errno = EINVAL;
	return err;
	}

	i = 0;
	found = 0;
	while (transport_modules_cmd[i].transport_name != NULL) {
	if (transport_modules_cmd[i].built_in) {
	if (!strcmp(transport_modules_cmd[i].transport_name, name)) {
	err = transport_modules_cmd[i].transport_id;
	found = 1;
	break;
	}
	}
	i++;
	}

	if (!found) {
	savederrno = EINVAL;
	}

	errno = err == KNET_MAX_TRANSPORTS ? savederrno : 0;
	return err;
	}

	int knet_handle_set_transport_reconnect_interval(knet_handle_t knet_h, uint32_t msecs)
	{
	int savederrno = 0;

	if (!knet_h) {
	errno = EINVAL;
	return -1;
	}

	if (!msecs) {
	errno = EINVAL;
	return -1;
	}

	if (msecs < 1000) {
	log_warn(knet_h, KNET_SUB_HANDLE, "reconnect internval below 1 sec (%u msecs) might be too aggressive", msecs);
	}

	if (msecs > 60000) {
	log_warn(knet_h, KNET_SUB_HANDLE, "reconnect internval above 1 minute (%u msecs) could cause long delays in network convergiance", msecs);
	}

	savederrno = get_global_wrlock(knet_h);
	if (savederrno) {
	log_err(knet_h, KNET_SUB_HANDLE, "Unable to get read lock: %s",
	strerror(savederrno));
	errno = savederrno;
	return -1;
	}

	knet_h->reconnect_int = msecs;

	pthread_rwlock_unlock(&knet_h->global_rwlock);
	errno = 0;
	return 0;
	}

	int knet_handle_get_transport_reconnect_interval(knet_handle_t knet_h, uint32_t *msecs)
	{
	int savederrno = 0;

	if (!knet_h) {
	errno = EINVAL;
	return -1;
	}

	if (!msecs) {
	errno = EINVAL;
	return -1;
	}

	savederrno = pthread_rwlock_rdlock(&knet_h->global_rwlock);
	if (savederrno) {
	log_err(knet_h, KNET_SUB_HANDLE, "Unable to get read lock: %s",
	strerror(savederrno));
	errno = savederrno;
	return -1;
	}

	*msecs = knet_h->reconnect_int;

	pthread_rwlock_unlock(&knet_h->global_rwlock);
	errno = 0;
	return 0;
	}
	diff --git a/libknet/transports.h b/libknet/transports.h
	index d58b7a39..6338140e 100644
	--- a/libknet/transports.h
	+++ b/libknet/transports.h
	@@ -1,23 +1,25 @@
	/*
	* Copyright (C) 2016-2019 Red Hat, Inc. All rights reserved.
	*
	* Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
	*
	* This software licensed under GPL-2.0+, LGPL-2.0+
	*/

	#ifndef __KNET_TRANSPORTS_H__
	#define __KNET_TRANSPORTS_H__

	int start_all_transports(knet_handle_t knet_h);
	void stop_all_transports(knet_handle_t knet_h);

	int transport_link_set_config(knet_handle_t knet_h, struct knet_link *kn_link, uint8_t transport);
	int transport_link_clear_config(knet_handle_t knet_h, struct knet_link *kn_link);
	int transport_link_dyn_connect(knet_handle_t knet_h, int sockfd, struct knet_link *kn_link);
	int transport_rx_sock_error(knet_handle_t knet_h, uint8_t transport, int sockfd, int recv_err, int recv_errno);
	int transport_tx_sock_error(knet_handle_t knet_h, uint8_t transport, int sockfd, int recv_err, int recv_errno);
	int transport_rx_is_data(knet_handle_t knet_h, uint8_t transport, int sockfd, struct knet_mmsghdr *msg);
	+int transport_get_proto(knet_handle_t knet_h, uint8_t transport);
	+int transport_get_acl_type(knet_handle_t knet_h, uint8_t transport);
	int transport_get_connection_oriented(knet_handle_t knet_h, uint8_t transport);

	#endif

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