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	diff --git a/libknet/threads_rx.c b/libknet/threads_rx.c
	index 2b8d4955..50e8632b 100644
	--- a/libknet/threads_rx.c
	+++ b/libknet/threads_rx.c
	@@ -1,1070 +1,1083 @@
	/*
	* Copyright (C) 2012-2023 Red Hat, Inc. All rights reserved.
	*
	* Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
	* Federico Simoncelli <fsimon@kronosnet.org>
	*
	* This software licensed under LGPL-2.0+
	*/

	#include "config.h"

	#include <stdio.h>
	#include <string.h>
	#include <errno.h>
	#include <sys/uio.h>
	#include <pthread.h>

	#include "compat.h"
	#include "compress.h"
	#include "crypto.h"
	#include "host.h"
	#include "links.h"
	#include "links_acl.h"
	#include "logging.h"
	#include "transports.h"
	#include "transport_common.h"
	#include "threads_common.h"
	#include "threads_heartbeat.h"
	#include "threads_rx.h"
	#include "netutils.h"

	/*
	* RECV
	*/

	/*
	* return 1 if a > b
	* return -1 if b > a
	* return 0 if they are equal
	*/
	static inline int timecmp(struct timespec a, struct timespec b)
	{
	if (a.tv_sec != b.tv_sec) {
	if (a.tv_sec > b.tv_sec) {
	return 1;
	} else {
	return -1;
	}
	} else {
	if (a.tv_nsec > b.tv_nsec) {
	return 1;
	} else if (a.tv_nsec < b.tv_nsec) {
	return -1;
	} else {
	return 0;
	}
	}
	}

	/*
	* this functions needs to return an index (0 to 7)
	* to a knet_host_defrag_buf. (-1 on errors)
	*/

	static int find_pckt_defrag_buf(knet_handle_t knet_h, struct knet_header *inbuf)
	{
	struct knet_host *src_host = knet_h->host_index[inbuf->kh_node];
	int i, oldest;

	/*
	* check if there is a buffer already in use handling the same seq_num
	*/
	for (i = 0; i < KNET_DEFRAG_BUFFERS; i++) {
	if (src_host->defrag_buf[i].in_use) {
	if (src_host->defrag_buf[i].pckt_seq == inbuf->khp_data_seq_num) {
	return i;
	}
	}
	}

	/*
	* If there is no buffer that's handling the current seq_num
	* either it's new or it's been reclaimed already.
	* check if it's been reclaimed/seen before using the defrag circular
	* buffer. If the pckt has been seen before, the buffer expired (ETIME)
	* and there is no point to try to defrag it again.
	*/
	if (!_seq_num_lookup(src_host, inbuf->khp_data_seq_num, 1, 0)) {
	errno = ETIME;
	return -1;
	}

	/*
	* register the pckt as seen
	*/
	_seq_num_set(src_host, inbuf->khp_data_seq_num, 1);

	/*
	* see if there is a free buffer
	*/
	for (i = 0; i < KNET_DEFRAG_BUFFERS; i++) {
	if (!src_host->defrag_buf[i].in_use) {
	return i;
	}
	}

	/*
	* at this point, there are no free buffers, the pckt is new
	* and we need to reclaim a buffer, and we will take the one
	* with the oldest timestamp. It's as good as any.
	*/

	oldest = 0;

	for (i = 0; i < KNET_DEFRAG_BUFFERS; i++) {
	if (timecmp(src_host->defrag_buf[i].last_update, src_host->defrag_buf[oldest].last_update) < 0) {
	oldest = i;
	}
	}
	src_host->defrag_buf[oldest].in_use = 0;
	return oldest;
	}

	static int pckt_defrag(knet_handle_t knet_h, struct knet_header inbuf, ssize_t len)
	{
	struct knet_host_defrag_buf *defrag_buf;
	int defrag_buf_idx;

	defrag_buf_idx = find_pckt_defrag_buf(knet_h, inbuf);
	if (defrag_buf_idx < 0) {
	return 1;
	}

	defrag_buf = &knet_h->host_index[inbuf->kh_node]->defrag_buf[defrag_buf_idx];

	/*
	* if the buf is not is use, then make sure it's clean
	*/
	if (!defrag_buf->in_use) {
	memset(defrag_buf, 0, sizeof(struct knet_host_defrag_buf));
	defrag_buf->in_use = 1;
	defrag_buf->pckt_seq = inbuf->khp_data_seq_num;
	}

	/*
	* update timestamp on the buffer
	*/
	clock_gettime(CLOCK_MONOTONIC, &defrag_buf->last_update);

	/*
	* check if we already received this fragment
	*/
	if (defrag_buf->frag_map[inbuf->khp_data_frag_seq]) {
	/*
	* if we have received this fragment and we didn't clear the buffer
	* it means that we don't have all fragments yet
	*/
	return 1;
	}

	/*
	* we need to handle the last packet with gloves due to its different size
	*/

	if (inbuf->khp_data_frag_seq == inbuf->khp_data_frag_num) {
	defrag_buf->last_frag_size = *len;

	/*
	* in the event when the last packet arrives first,
	* we still don't know the offset vs the other fragments (based on MTU),
	* so we store the fragment at the end of the buffer where it's safe
	* and take a copy of the len so that we can restore its offset later.
	* remember we can't use the local MTU for this calculation because pMTU
	* can be asymettric between the same hosts.
	*/
	if (!defrag_buf->frag_size) {
	defrag_buf->last_first = 1;
	memmove(defrag_buf->buf + (KNET_MAX_PACKET_SIZE - *len),
	inbuf->khp_data_userdata,
	*len);
	}
	} else {
	defrag_buf->frag_size = *len;
	}

	if (defrag_buf->frag_size) {
	memmove(defrag_buf->buf + ((inbuf->khp_data_frag_seq - 1) * defrag_buf->frag_size),
	inbuf->khp_data_userdata, *len);
	}

	defrag_buf->frag_recv++;
	defrag_buf->frag_map[inbuf->khp_data_frag_seq] = 1;

	/*
	* check if we received all the fragments
	*/
	if (defrag_buf->frag_recv == inbuf->khp_data_frag_num) {
	/*
	* special case the last pckt
	*/

	if (defrag_buf->last_first) {
	memmove(defrag_buf->buf + ((inbuf->khp_data_frag_num - 1) * defrag_buf->frag_size),
	defrag_buf->buf + (KNET_MAX_PACKET_SIZE - defrag_buf->last_frag_size),
	defrag_buf->last_frag_size);
	}

	/*
	* recalculate packet lenght
	*/

	len = ((inbuf->khp_data_frag_num - 1) defrag_buf->frag_size) + defrag_buf->last_frag_size;

	/*
	* copy the pckt back in the user data
	*/
	memmove(inbuf->khp_data_userdata, defrag_buf->buf, *len);

	/*
	* free this buffer
	*/
	defrag_buf->in_use = 0;
	return 0;
	}

	return 1;
	}

	/*
	* processing incoming packets vs access lists
	*/
	static int _check_rx_acl(knet_handle_t knet_h, struct knet_link src_link, const struct knet_mmsghdr msg)
	{
	if (knet_h->use_access_lists) {
	if (!check_validate(knet_h, src_link, msg->msg_hdr.msg_name)) {
	char src_ipaddr[KNET_MAX_HOST_LEN];
	char src_port[KNET_MAX_PORT_LEN];

	memset(src_ipaddr, 0, KNET_MAX_HOST_LEN);
	memset(src_port, 0, KNET_MAX_PORT_LEN);
	if (knet_addrtostr(msg->msg_hdr.msg_name, sockaddr_len(msg->msg_hdr.msg_name),
	src_ipaddr, KNET_MAX_HOST_LEN,
	src_port, KNET_MAX_PORT_LEN) < 0) {

	log_warn(knet_h, KNET_SUB_RX, "Packet rejected: unable to resolve host/port");
	} else {
	log_warn(knet_h, KNET_SUB_RX, "Packet rejected from %s:%s", src_ipaddr, src_port);
	}
	return 0;
	}
	}
	return 1;
	}

	+static int _fast_data_up(knet_handle_t knet_h, struct knet_host src_host, struct knet_link src_link)
	+{
	+ if (src_link->received_pong) {
	+ log_debug(knet_h, KNET_SUB_RX, "host: %u link: %u received data during valid ping/pong activity. Force link up.", src_host->host_id, src_link->link_id);
	+ _link_updown(knet_h, src_host->host_id, src_link->link_id, src_link->status.enabled, 1, 0);
	+ return 1;
	+ }
	+ // host is not eligible for fast data up
	+ return 0;
	+}
	+
	static void _parse_recv_from_links(knet_handle_t knet_h, int sockfd, const struct knet_mmsghdr *msg)
	{
	int err = 0, savederrno = 0, stats_err = 0;
	ssize_t outlen;
	struct knet_host *src_host;
	struct knet_link *src_link;
	unsigned long long latency_last;
	knet_node_id_t dst_host_ids[KNET_MAX_HOST];
	size_t dst_host_ids_entries = 0;
	int bcast = 1;
	uint64_t decrypt_time = 0;
	struct timespec recvtime;
	struct knet_header *inbuf = msg->msg_hdr.msg_iov->iov_base;
	unsigned char outbuf = (unsigned char )msg->msg_hdr.msg_iov->iov_base;
	ssize_t len = msg->msg_len;
	struct iovec iov_out[1];
	int8_t channel;
	seq_num_t recv_seq_num;
	int wipe_bufs = 0;
	int try_decrypt = 0, decrypted = 0, i, found_link = 0;

	for (i = 1; i <= KNET_MAX_CRYPTO_INSTANCES; i++) {
	if (knet_h->crypto_instance[i]) {
	try_decrypt = 1;
	break;
	}
	}

	if ((!try_decrypt) && (knet_h->crypto_only == KNET_CRYPTO_RX_DISALLOW_CLEAR_TRAFFIC)) {
	log_debug(knet_h, KNET_SUB_RX, "RX thread configured to accept only crypto packets, but no crypto configs are configured!");
	return;
	}

	if (try_decrypt) {
	struct timespec start_time;
	struct timespec end_time;

	clock_gettime(CLOCK_MONOTONIC, &start_time);
	if (crypto_authenticate_and_decrypt(knet_h,
	(unsigned char *)inbuf,
	len,
	knet_h->recv_from_links_buf_decrypt,
	&outlen) < 0) {
	log_debug(knet_h, KNET_SUB_RX, "Unable to decrypt/auth packet");
	if (knet_h->crypto_only == KNET_CRYPTO_RX_DISALLOW_CLEAR_TRAFFIC) {
	char src_ipaddr[KNET_MAX_HOST_LEN];
	char src_port[KNET_MAX_PORT_LEN];

	memset(src_ipaddr, 0, KNET_MAX_HOST_LEN);
	memset(src_port, 0, KNET_MAX_PORT_LEN);
	if (knet_addrtostr(msg->msg_hdr.msg_name, sockaddr_len(msg->msg_hdr.msg_name),
	src_ipaddr, KNET_MAX_HOST_LEN,
	src_port, KNET_MAX_PORT_LEN) < 0) {
	log_err(knet_h, KNET_SUB_RX, "Unable to decrypt packet from unknown host/port (size %zu)!", len);
	} else {
	log_err(knet_h, KNET_SUB_RX, "Unable to decrypt packet from %s:%s (size %zu)!", src_ipaddr, src_port, len);
	}
	return;
	}
	log_debug(knet_h, KNET_SUB_RX, "Attempting to process packet as clear data");
	} else {
	clock_gettime(CLOCK_MONOTONIC, &end_time);
	timespec_diff(start_time, end_time, &decrypt_time);

	len = outlen;
	inbuf = (struct knet_header *)knet_h->recv_from_links_buf_decrypt;
	decrypted = 1;
	}
	}

	if (len < (ssize_t)(KNET_HEADER_SIZE + 1)) {
	log_debug(knet_h, KNET_SUB_RX, "Packet is too short: %ld", (long)len);
	return;
	}

	if (inbuf->kh_version != KNET_HEADER_VERSION) {
	log_debug(knet_h, KNET_SUB_RX, "Packet version does not match");
	return;
	}

	inbuf->kh_node = ntohs(inbuf->kh_node);
	src_host = knet_h->host_index[inbuf->kh_node];
	if (src_host == NULL) { /* host not found */
	log_debug(knet_h, KNET_SUB_RX, "Unable to find source host for this packet");
	return;
	}

	if ((inbuf->kh_type & KNET_HEADER_TYPE_PMSK) != 0) {
	/* be aware this works only for PING / PONG and PMTUd packets! */
	src_link = src_host->link +
	(inbuf->khp_ping_link % KNET_MAX_LINK);
	if (!_check_rx_acl(knet_h, src_link, msg)) {
	return;
	}
	if (src_link->dynamic == KNET_LINK_DYNIP) {
	if (cmpaddr(&src_link->dst_addr, msg->msg_hdr.msg_name) != 0) {
	log_debug(knet_h, KNET_SUB_RX, "host: %u link: %u appears to have changed ip address",
	src_host->host_id, src_link->link_id);
	memmove(&src_link->dst_addr, msg->msg_hdr.msg_name, sizeof(struct sockaddr_storage));
	if (knet_addrtostr(&src_link->dst_addr, sockaddr_len(&src_link->dst_addr),
	src_link->status.dst_ipaddr, KNET_MAX_HOST_LEN,
	src_link->status.dst_port, KNET_MAX_PORT_LEN) != 0) {
	log_debug(knet_h, KNET_SUB_RX, "Unable to resolve ???");
	snprintf(src_link->status.dst_ipaddr, KNET_MAX_HOST_LEN - 1, "Unknown!!!");
	snprintf(src_link->status.dst_port, KNET_MAX_PORT_LEN - 1, "??");
	} else {
	log_info(knet_h, KNET_SUB_RX,
	"host: %u link: %u new connection established from: %s:%s",
	src_host->host_id, src_link->link_id,
	src_link->status.dst_ipaddr, src_link->status.dst_port);
	}
	}
	/*
	* transport has already accepted the connection here
	* otherwise we would not be receiving packets
	*/
	transport_link_dyn_connect(knet_h, sockfd, src_link);
	}
	} else { /* data packet */
	for (i = 0; i < KNET_MAX_LINK; i++) {
	src_link = &src_host->link[i];
	if (cmpaddr(&src_link->dst_addr, msg->msg_hdr.msg_name) == 0) {
	found_link = 1;
	break;
	}
	}
	if (found_link) {
	/*
	* this check is currently redundant.. Keep it here for now
	*/
	if (!_check_rx_acl(knet_h, src_link, msg)) {
	return;
	}
	} else {
	log_debug(knet_h, KNET_SUB_RX, "Unable to determine source link for data packet. Discarding packet.");
	return;
	}
	}

	stats_err = pthread_mutex_lock(&src_link->link_stats_mutex);
	if (stats_err) {
	log_err(knet_h, KNET_SUB_RX, "Unable to get stats mutex lock for host %u link %u: %s",
	src_host->host_id, src_link->link_id, strerror(savederrno));
	return;
	}

	switch (inbuf->kh_type) {
	case KNET_HEADER_TYPE_DATA:

	/* data stats at the top for consistency with TX */
	src_link->status.stats.rx_data_packets++;
	src_link->status.stats.rx_data_bytes += len;

	if (decrypted) {
	stats_err = pthread_mutex_lock(&knet_h->handle_stats_mutex);
	if (stats_err < 0) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	log_err(knet_h, KNET_SUB_RX, "Unable to get mutex lock: %s", strerror(stats_err));
	return;
	}
	/* Only update the crypto overhead for data packets. Mainly to be
	consistent with TX */
	if (decrypt_time < knet_h->stats.rx_crypt_time_min) {
	knet_h->stats.rx_crypt_time_min = decrypt_time;
	}
	if (decrypt_time > knet_h->stats.rx_crypt_time_max) {
	knet_h->stats.rx_crypt_time_max = decrypt_time;
	}
	knet_h->stats.rx_crypt_time_ave =
	(knet_h->stats.rx_crypt_time_ave * knet_h->stats.rx_crypt_packets +
	decrypt_time) / (knet_h->stats.rx_crypt_packets+1);
	knet_h->stats.rx_crypt_packets++;
	pthread_mutex_unlock(&knet_h->handle_stats_mutex);
	}

	if (!src_host->status.reachable) {
	- pthread_mutex_unlock(&src_link->link_stats_mutex);
	- log_debug(knet_h, KNET_SUB_RX, "Source host %u not reachable yet. Discarding packet.", src_host->host_id);
	- return;
	+ if (!_fast_data_up(knet_h, src_host, src_link)) {
	+ pthread_mutex_unlock(&src_link->link_stats_mutex);
	+ log_debug(knet_h, KNET_SUB_RX, "Source host %u not reachable yet. Discarding packet.", src_host->host_id);
	+ return;
	+ }
	}

	inbuf->khp_data_seq_num = ntohs(inbuf->khp_data_seq_num);
	channel = inbuf->khp_data_channel;
	src_host->got_data = 1;

	if (!_seq_num_lookup(src_host, inbuf->khp_data_seq_num, 0, 0)) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	if (src_host->link_handler_policy != KNET_LINK_POLICY_ACTIVE) {
	log_debug(knet_h, KNET_SUB_RX, "Packet has already been delivered");
	}
	return;
	}

	if (inbuf->khp_data_frag_num > 1) {
	/*
	* len as received from the socket also includes extra stuff
	* that the defrag code doesn't care about. So strip it
	* here and readd only for repadding once we are done
	* defragging
	*/
	len = len - KNET_HEADER_DATA_SIZE;
	if (pckt_defrag(knet_h, inbuf, &len)) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	return;
	}
	len = len + KNET_HEADER_DATA_SIZE;
	}

	if (inbuf->khp_data_compress) {
	ssize_t decmp_outlen = KNET_DATABUFSIZE_COMPRESS;
	struct timespec start_time;
	struct timespec end_time;
	uint64_t compress_time;

	clock_gettime(CLOCK_MONOTONIC, &start_time);
	err = decompress(knet_h, inbuf->khp_data_compress,
	(const unsigned char *)inbuf->khp_data_userdata,
	len - KNET_HEADER_DATA_SIZE,
	knet_h->recv_from_links_buf_decompress,
	&decmp_outlen);

	stats_err = pthread_mutex_lock(&knet_h->handle_stats_mutex);
	if (stats_err < 0) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	log_err(knet_h, KNET_SUB_RX, "Unable to get mutex lock: %s", strerror(stats_err));
	return;
	}

	clock_gettime(CLOCK_MONOTONIC, &end_time);
	timespec_diff(start_time, end_time, &compress_time);

	if (!err) {
	/* Collect stats */
	if (compress_time < knet_h->stats.rx_compress_time_min) {
	knet_h->stats.rx_compress_time_min = compress_time;
	}
	if (compress_time > knet_h->stats.rx_compress_time_max) {
	knet_h->stats.rx_compress_time_max = compress_time;
	}
	knet_h->stats.rx_compress_time_ave =
	(knet_h->stats.rx_compress_time_ave * knet_h->stats.rx_compressed_packets +
	compress_time) / (knet_h->stats.rx_compressed_packets+1);

	knet_h->stats.rx_compressed_packets++;
	knet_h->stats.rx_compressed_original_bytes += decmp_outlen;
	knet_h->stats.rx_compressed_size_bytes += len - KNET_HEADER_SIZE;

	memmove(inbuf->khp_data_userdata, knet_h->recv_from_links_buf_decompress, decmp_outlen);
	len = decmp_outlen + KNET_HEADER_DATA_SIZE;
	} else {
	pthread_mutex_unlock(&knet_h->handle_stats_mutex);
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	log_err(knet_h, KNET_SUB_COMPRESS, "Unable to decompress packet (%d): %s",
	err, strerror(errno));
	return;
	}
	pthread_mutex_unlock(&knet_h->handle_stats_mutex);
	}

	if (knet_h->enabled != 1) /* data forward is disabled */
	break;

	if (knet_h->dst_host_filter_fn) {
	size_t host_idx;
	int found = 0;

	bcast = knet_h->dst_host_filter_fn(
	knet_h->dst_host_filter_fn_private_data,
	(const unsigned char *)inbuf->khp_data_userdata,
	len - KNET_HEADER_DATA_SIZE,
	KNET_NOTIFY_RX,
	knet_h->host_id,
	inbuf->kh_node,
	&channel,
	dst_host_ids,
	&dst_host_ids_entries);
	if (bcast < 0) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	log_debug(knet_h, KNET_SUB_RX, "Error from dst_host_filter_fn: %d", bcast);
	return;
	}

	if ((!bcast) && (!dst_host_ids_entries)) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	log_debug(knet_h, KNET_SUB_RX, "Message is unicast but no dst_host_ids_entries");
	return;
	}

	/* check if we are dst for this packet */
	if (!bcast) {
	if (dst_host_ids_entries > KNET_MAX_HOST) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	log_debug(knet_h, KNET_SUB_RX, "dst_host_filter_fn returned too many destinations");
	return;
	}
	for (host_idx = 0; host_idx < dst_host_ids_entries; host_idx++) {
	if (dst_host_ids[host_idx] == knet_h->host_id) {
	found = 1;
	break;
	}
	}
	if (!found) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	log_debug(knet_h, KNET_SUB_RX, "Packet is not for us");
	return;
	}
	}
	}

	if (!knet_h->sockfd[channel].in_use) {
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	log_debug(knet_h, KNET_SUB_RX,
	"received packet for channel %d but there is no local sock connected",
	channel);
	return;
	}

	outlen = 0;
	memset(iov_out, 0, sizeof(iov_out));

	retry:
	iov_out[0].iov_base = (void *) inbuf->khp_data_userdata + outlen;
	iov_out[0].iov_len = len - (outlen + KNET_HEADER_DATA_SIZE);

	outlen = writev(knet_h->sockfd[channel].sockfd[knet_h->sockfd[channel].is_created], iov_out, 1);
	if ((outlen > 0) && (outlen < (ssize_t)iov_out[0].iov_len)) {
	log_debug(knet_h, KNET_SUB_RX,
	"Unable to send all data to the application in one go. Expected: %zu Sent: %zd\n",
	iov_out[0].iov_len, outlen);
	goto retry;
	}

	if (outlen <= 0) {
	knet_h->sock_notify_fn(knet_h->sock_notify_fn_private_data,
	knet_h->sockfd[channel].sockfd[0],
	channel,
	KNET_NOTIFY_RX,
	outlen,
	errno);
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	return;
	}
	if ((size_t)outlen == iov_out[0].iov_len) {
	_seq_num_set(src_host, inbuf->khp_data_seq_num, 0);
	}
	break;
	case KNET_HEADER_TYPE_PING:
	outlen = KNET_HEADER_PING_SIZE;
	inbuf->kh_type = KNET_HEADER_TYPE_PONG;
	inbuf->kh_node = htons(knet_h->host_id);
	recv_seq_num = ntohs(inbuf->khp_ping_seq_num);
	src_link->status.stats.rx_ping_packets++;
	src_link->status.stats.rx_ping_bytes += len;

	wipe_bufs = 0;

	if (!inbuf->khp_ping_timed) {
	/*
	* we might be receiving this message from all links, but we want
	* to process it only the first time
	*/
	if (recv_seq_num != src_host->untimed_rx_seq_num) {
	/*
	* cache the untimed seq num
	*/
	src_host->untimed_rx_seq_num = recv_seq_num;
	/*
	* if the host has received data in between
	* untimed ping, then we don't need to wipe the bufs
	*/
	if (src_host->got_data) {
	src_host->got_data = 0;
	wipe_bufs = 0;
	} else {
	wipe_bufs = 1;
	}
	}
	_seq_num_lookup(src_host, recv_seq_num, 0, wipe_bufs);
	} else {
	/*
	* pings always arrives in bursts over all the link
	* catch the first of them to cache the seq num and
	* avoid duplicate processing
	*/
	if (recv_seq_num != src_host->timed_rx_seq_num) {
	src_host->timed_rx_seq_num = recv_seq_num;

	if (recv_seq_num == 0) {
	_seq_num_lookup(src_host, recv_seq_num, 0, 1);
	}
	}
	}

	if (knet_h->crypto_in_use_config) {
	if (crypto_encrypt_and_sign(knet_h,
	(const unsigned char *)inbuf,
	outlen,
	knet_h->recv_from_links_buf_crypt,
	&outlen) < 0) {
	log_debug(knet_h, KNET_SUB_RX, "Unable to encrypt pong packet");
	break;
	}
	outbuf = knet_h->recv_from_links_buf_crypt;
	stats_err = pthread_mutex_lock(&knet_h->handle_stats_mutex);
	if (stats_err < 0) {
	log_err(knet_h, KNET_SUB_RX, "Unable to get mutex lock: %s", strerror(stats_err));
	break;
	}
	knet_h->stats_extra.tx_crypt_pong_packets++;
	pthread_mutex_unlock(&knet_h->handle_stats_mutex);
	}

	retry_pong:
	if (src_link->transport_connected) {
	if (transport_get_connection_oriented(knet_h, src_link->transport) == TRANSPORT_PROTO_NOT_CONNECTION_ORIENTED) {
	len = sendto(src_link->outsock, outbuf, outlen, MSG_DONTWAIT \| MSG_NOSIGNAL,
	(struct sockaddr *) &src_link->dst_addr, knet_h->knet_transport_fd_tracker[src_link->outsock].sockaddr_len);
	} else {
	len = sendto(src_link->outsock, outbuf, outlen, MSG_DONTWAIT \| MSG_NOSIGNAL, NULL, 0);
	}
	savederrno = errno;
	if (len != outlen) {
	err = transport_tx_sock_error(knet_h, src_link->transport, src_link->outsock, KNET_SUB_RX, len, savederrno);
	switch(err) {
	case -1: /* unrecoverable error */
	log_debug(knet_h, KNET_SUB_RX,
	"Unable to send pong reply (sock: %d) packet (sendto): %d %s. recorded src ip: %s src port: %s dst ip: %s dst port: %s",
	src_link->outsock, errno, strerror(errno),
	src_link->status.src_ipaddr, src_link->status.src_port,
	src_link->status.dst_ipaddr, src_link->status.dst_port);
	src_link->status.stats.tx_pong_errors++;
	break;
	case 0: /* ignore error and continue */
	break;
	case 1: /* retry to send those same data */
	src_link->status.stats.tx_pong_retries++;
	goto retry_pong;
	break;
	}
	}
	src_link->status.stats.tx_pong_packets++;
	src_link->status.stats.tx_pong_bytes += outlen;
	}
	break;
	case KNET_HEADER_TYPE_PONG:
	src_link->status.stats.rx_pong_packets++;
	src_link->status.stats.rx_pong_bytes += len;
	clock_gettime(CLOCK_MONOTONIC, &src_link->status.pong_last);

	memmove(&recvtime, &inbuf->khp_ping_time[0], sizeof(struct timespec));
	timespec_diff(recvtime,
	src_link->status.pong_last, &latency_last);

	if ((latency_last / 1000llu) > src_link->pong_timeout) {
	log_debug(knet_h, KNET_SUB_RX,
	"Incoming pong packet from host: %u link: %u has higher latency than pong_timeout. Discarding",
	src_host->host_id, src_link->link_id);
	} else {

	/*
	* in words : ('previous mean' * '(count -1)') + 'new value') / 'count'
	*/

	src_link->latency_cur_samples++;

	/*
	* limit to max_samples (precision)
	*/
	if (src_link->latency_cur_samples >= src_link->latency_max_samples) {
	src_link->latency_cur_samples = src_link->latency_max_samples;
	}
	src_link->status.latency =
	(((src_link->status.latency * (src_link->latency_cur_samples - 1)) + (latency_last / 1000llu)) / src_link->latency_cur_samples);

	if (src_link->status.latency < src_link->pong_timeout_adj) {
	if (!src_link->status.connected) {
	if (src_link->received_pong >= src_link->pong_count) {
	log_info(knet_h, KNET_SUB_RX, "host: %u link: %u is up",
	src_host->host_id, src_link->link_id);
	_link_updown(knet_h, src_host->host_id, src_link->link_id, src_link->status.enabled, 1, 0);
	} else {
	src_link->received_pong++;
	log_debug(knet_h, KNET_SUB_RX, "host: %u link: %u received pong: %u",
	src_host->host_id, src_link->link_id, src_link->received_pong);
	}
	}
	}
	/* Calculate latency stats */
	if (src_link->status.latency > src_link->status.stats.latency_max) {
	src_link->status.stats.latency_max = src_link->status.latency;
	}
	if (src_link->status.latency < src_link->status.stats.latency_min) {
	src_link->status.stats.latency_min = src_link->status.latency;
	}

	/*
	* those 2 lines below make all latency average calculations consistent and capped to
	* link precision. In future we will kill the one above to keep only this one in
	* the stats structure, but for now we leave it around to avoid API/ABI
	* breakage as we backport the fixes to stable
	*/
	src_link->status.stats.latency_ave = src_link->status.latency;
	src_link->status.stats.latency_samples = src_link->latency_cur_samples;
	}
	break;
	case KNET_HEADER_TYPE_PMTUD:
	src_link->status.stats.rx_pmtu_packets++;
	src_link->status.stats.rx_pmtu_bytes += len;
	outlen = KNET_HEADER_PMTUD_SIZE;
	inbuf->kh_type = KNET_HEADER_TYPE_PMTUD_REPLY;
	inbuf->kh_node = htons(knet_h->host_id);

	if (knet_h->crypto_in_use_config) {
	if (crypto_encrypt_and_sign(knet_h,
	(const unsigned char *)inbuf,
	outlen,
	knet_h->recv_from_links_buf_crypt,
	&outlen) < 0) {
	log_debug(knet_h, KNET_SUB_RX, "Unable to encrypt PMTUd reply packet");
	break;
	}
	outbuf = knet_h->recv_from_links_buf_crypt;
	stats_err = pthread_mutex_lock(&knet_h->handle_stats_mutex);
	if (stats_err < 0) {
	log_err(knet_h, KNET_SUB_RX, "Unable to get mutex lock: %s", strerror(stats_err));
	break;
	}
	knet_h->stats_extra.tx_crypt_pmtu_reply_packets++;
	pthread_mutex_unlock(&knet_h->handle_stats_mutex);
	}

	/* Unlock so we don't deadlock with tx_mutex */
	pthread_mutex_unlock(&src_link->link_stats_mutex);

	savederrno = pthread_mutex_lock(&knet_h->tx_mutex);
	if (savederrno) {
	log_err(knet_h, KNET_SUB_RX, "Unable to get TX mutex lock: %s", strerror(savederrno));
	goto out_pmtud;
	}
	retry_pmtud:
	if (src_link->transport_connected) {
	if (transport_get_connection_oriented(knet_h, src_link->transport) == TRANSPORT_PROTO_NOT_CONNECTION_ORIENTED) {
	len = sendto(src_link->outsock, outbuf, outlen, MSG_DONTWAIT \| MSG_NOSIGNAL,
	(struct sockaddr *) &src_link->dst_addr, knet_h->knet_transport_fd_tracker[src_link->outsock].sockaddr_len);
	} else {
	len = sendto(src_link->outsock, outbuf, outlen, MSG_DONTWAIT \| MSG_NOSIGNAL, NULL, 0);
	}
	savederrno = errno;
	if (len != outlen) {
	err = transport_tx_sock_error(knet_h, src_link->transport, src_link->outsock, KNET_SUB_RX, len, savederrno);
	stats_err = pthread_mutex_lock(&src_link->link_stats_mutex);
	if (stats_err < 0) {
	log_err(knet_h, KNET_SUB_RX, "Unable to get mutex lock: %s", strerror(stats_err));
	break;
	}
	switch(err) {
	case -1: /* unrecoverable error */
	log_debug(knet_h, KNET_SUB_RX,
	"Unable to send PMTUd reply (sock: %d) packet (sendto): %d %s. recorded src ip: %s src port: %s dst ip: %s dst port: %s",
	src_link->outsock, errno, strerror(errno),
	src_link->status.src_ipaddr, src_link->status.src_port,
	src_link->status.dst_ipaddr, src_link->status.dst_port);

	src_link->status.stats.tx_pmtu_errors++;
	break;
	case 0: /* ignore error and continue */
	src_link->status.stats.tx_pmtu_errors++;
	break;
	case 1: /* retry to send those same data */
	src_link->status.stats.tx_pmtu_retries++;
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	goto retry_pmtud;
	break;
	}
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	}
	}
	pthread_mutex_unlock(&knet_h->tx_mutex);
	out_pmtud:
	return; /* Don't need to unlock link_stats_mutex */
	case KNET_HEADER_TYPE_PMTUD_REPLY:
	src_link->status.stats.rx_pmtu_packets++;
	src_link->status.stats.rx_pmtu_bytes += len;

	/* pmtud_mutex can't be acquired while we hold a link_stats_mutex (ordering) */
	pthread_mutex_unlock(&src_link->link_stats_mutex);

	if (pthread_mutex_lock(&knet_h->pmtud_mutex) != 0) {
	log_debug(knet_h, KNET_SUB_RX, "Unable to get mutex lock");
	break;
	}
	src_link->last_recv_mtu = inbuf->khp_pmtud_size;
	pthread_cond_signal(&knet_h->pmtud_cond);
	pthread_mutex_unlock(&knet_h->pmtud_mutex);
	return;
	default:
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	return;
	}
	pthread_mutex_unlock(&src_link->link_stats_mutex);
	}

	static void _handle_recv_from_links(knet_handle_t knet_h, int sockfd, struct knet_mmsghdr *msg)
	{
	int err, savederrno;
	int i, msg_recv, transport;

	if (pthread_rwlock_rdlock(&knet_h->global_rwlock) != 0) {
	log_debug(knet_h, KNET_SUB_RX, "Unable to get global read lock");
	return;
	}

	if (_is_valid_fd(knet_h, sockfd) < 1) {
	/*
	* this is normal if a fd got an event and before we grab the read lock
	* and the link is removed by another thread
	*/
	goto exit_unlock;
	}

	transport = knet_h->knet_transport_fd_tracker[sockfd].transport;

	/*
	* reset msg_namelen to buffer size because after recvmmsg
	* each msg_namelen will contain sizeof sockaddr_in or sockaddr_in6
	*/

	for (i = 0; i < PCKT_RX_BUFS; i++) {
	msg[i].msg_hdr.msg_namelen = knet_h->knet_transport_fd_tracker[sockfd].sockaddr_len;
	}

	msg_recv = _recvmmsg(sockfd, &msg[0], PCKT_RX_BUFS, MSG_DONTWAIT \| MSG_NOSIGNAL);
	savederrno = errno;

	/*
	* WARNING: man page for recvmmsg is wrong. Kernel implementation here:
	* recvmmsg can return:
	* -1 on error
	* 0 if the previous run of recvmmsg recorded an error on the socket
	* N number of messages (see exception below).
	*
	* If there is an error from recvmsg after receiving a frame or more, the recvmmsg
	* loop is interrupted, error recorded in the socket (getsockopt(SO_ERROR) and
	* it will be visibile in the next run.
	*
	* Need to be careful how we handle errors at this stage.
	*
	* error messages need to be handled on a per transport/protocol base
	* at this point we have different layers of error handling
	* - msg_recv < 0 -> error from this run
	* msg_recv = 0 -> error from previous run and error on socket needs to be cleared
	* - per-transport message data
	* example: msg[i].msg_hdr.msg_flags & MSG_NOTIFICATION or msg_len for SCTP == EOF,
	* but for UDP it is perfectly legal to receive a 0 bytes message.. go figure
	* - NOTE: on SCTP MSG_NOTIFICATION we get msg_recv == PCKT_FRAG_MAX messages and no
	* errno set. That means the error api needs to be able to abort the loop below.
	*/

	if (msg_recv <= 0) {
	transport_rx_sock_error(knet_h, transport, sockfd, msg_recv, savederrno);
	goto exit_unlock;
	}

	for (i = 0; i < msg_recv; i++) {
	err = transport_rx_is_data(knet_h, transport, sockfd, &msg[i]);

	/*
	* TODO: make this section silent once we are confident
	* all protocols packet handlers are good
	*/

	switch(err) {
	case KNET_TRANSPORT_RX_ERROR: /* on error */
	log_debug(knet_h, KNET_SUB_RX, "Transport reported error parsing packet");
	goto exit_unlock;
	break;
	case KNET_TRANSPORT_RX_NOT_DATA_CONTINUE: /* packet is not data and we should continue the packet process loop */
	log_debug(knet_h, KNET_SUB_RX, "Transport reported no data, continue");
	break;
	case KNET_TRANSPORT_RX_NOT_DATA_STOP: /* packet is not data and we should STOP the packet process loop */
	log_debug(knet_h, KNET_SUB_RX, "Transport reported no data, stop");
	goto exit_unlock;
	break;
	case KNET_TRANSPORT_RX_IS_DATA: /* packet is data and should be parsed as such */
	_parse_recv_from_links(knet_h, sockfd, &msg[i]);
	break;
	case KNET_TRANSPORT_RX_OOB_DATA_CONTINUE:
	log_debug(knet_h, KNET_SUB_RX, "Transport is processing sock OOB data, continue");
	break;
	case KNET_TRANSPORT_RX_OOB_DATA_STOP:
	log_debug(knet_h, KNET_SUB_RX, "Transport has completed processing sock OOB data, stop");
	goto exit_unlock;
	break;
	}
	}

	exit_unlock:
	pthread_rwlock_unlock(&knet_h->global_rwlock);
	}

	void _handle_recv_from_links_thread(void data)
	{
	int i, nev;
	knet_handle_t knet_h = (knet_handle_t) data;
	struct epoll_event events[KNET_EPOLL_MAX_EVENTS];
	struct sockaddr_storage address[PCKT_RX_BUFS];
	struct knet_mmsghdr msg[PCKT_RX_BUFS];
	struct iovec iov_in[PCKT_RX_BUFS];

	set_thread_status(knet_h, KNET_THREAD_RX, KNET_THREAD_STARTED);

	memset(&msg, 0, sizeof(msg));
	memset(&events, 0, sizeof(events));

	for (i = 0; i < PCKT_RX_BUFS; i++) {
	iov_in[i].iov_base = (void *)knet_h->recv_from_links_buf[i];
	iov_in[i].iov_len = KNET_DATABUFSIZE;

	memset(&msg[i].msg_hdr, 0, sizeof(struct msghdr));

	msg[i].msg_hdr.msg_name = &address[i];
	msg[i].msg_hdr.msg_namelen = sizeof(struct sockaddr_storage); /* Real value filled in before actual use */
	msg[i].msg_hdr.msg_iov = &iov_in[i];
	msg[i].msg_hdr.msg_iovlen = 1;
	}

	while (!shutdown_in_progress(knet_h)) {
	nev = epoll_wait(knet_h->recv_from_links_epollfd, events, KNET_EPOLL_MAX_EVENTS, KNET_THREADS_TIMERES / 1000);

	/*
	* the RX threads only need to notify that there has been at least
	* one successful run after queue flush has been requested.
	* See setfwd in handle.c
	*/
	if (get_thread_flush_queue(knet_h, KNET_THREAD_RX) == KNET_THREAD_QUEUE_FLUSH) {
	set_thread_flush_queue(knet_h, KNET_THREAD_RX, KNET_THREAD_QUEUE_FLUSHED);
	}

	/*
	* we use timeout to detect if thread is shutting down
	*/
	if (nev == 0) {
	continue;
	}

	for (i = 0; i < nev; i++) {
	_handle_recv_from_links(knet_h, events[i].data.fd, msg);
	}
	}

	set_thread_status(knet_h, KNET_THREAD_RX, KNET_THREAD_STOPPED);

	return NULL;
	}

	ssize_t knet_recv(knet_handle_t knet_h, char *buff, const size_t buff_len, const int8_t channel)
	{
	int savederrno = 0;
	ssize_t err = 0;
	struct iovec iov_in;

	if (!_is_valid_handle(knet_h)) {
	return -1;
	}

	if (buff == NULL) {
	errno = EINVAL;
	return -1;
	}

	if (buff_len <= 0) {
	errno = EINVAL;
	return -1;
	}

	if (buff_len > KNET_MAX_PACKET_SIZE) {
	errno = EINVAL;
	return -1;
	}

	if (channel < 0) {
	errno = EINVAL;
	return -1;
	}

	if (channel >= KNET_DATAFD_MAX) {
	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;
	}

	if (!knet_h->sockfd[channel].in_use) {
	savederrno = EINVAL;
	err = -1;
	goto out_unlock;
	}

	memset(&iov_in, 0, sizeof(iov_in));
	iov_in.iov_base = (void *)buff;
	iov_in.iov_len = buff_len;

	err = readv(knet_h->sockfd[channel].sockfd[0], &iov_in, 1);
	savederrno = errno;

	out_unlock:
	pthread_rwlock_unlock(&knet_h->global_rwlock);
	errno = err ? savederrno : 0;
	return err;
	}

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