totemknet.c

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/*
 * Copyright (c) 2016-2022 Red Hat, Inc.
 *
 * All rights reserved.
 *
 * Author: Christine Caulfield (ccaulfie@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 <pthread.h>
#include <sched.h>
#include <time.h>
#include <sys/time.h>
#include <poll.h>
#include <sys/uio.h>
#include <limits.h>
 
#include <qb/qbdefs.h>
#include <qb/qbloop.h>
#ifdef HAVE_LIBNOZZLE
#include <libgen.h>
#include <libnozzle.h>
#endif
 
#include <corosync/sq.h>
#include <corosync/swab.h>
#include <corosync/logsys.h>
#include <corosync/icmap.h>
#include <corosync/totem/totemip.h>
#include "totemknet.h"
 
#include "main.h"
#include "util.h"
 
#include <libknet.h>
#include <corosync/totem/totemstats.h>
 
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
 
#ifdef HAVE_LIBNOZZLE
static int setup_nozzle(void *knet_context);
#endif
 
/* Should match that used by cfg */
#define CFG_INTERFACE_STATUS_MAX_LEN 512
 
#ifdef KNET_DATAFD_FLAG_RX_RETURN_INFO
#define KNET_IOV_LEN_MAX KNET_MAX_PACKET_SIZE + 1 + sizeof(struct knet_datafd_header)
#else
#define KNET_IOV_LEN_MAX KNET_MAX_PACKET_SIZE + 1
#endif
 
struct totemknet_instance {
        struct crypto_instance *crypto_inst;
 
        struct knet_handle_crypto_cfg last_good_crypto_cfg;
 
        qb_loop_t *poll_handle;
 
        knet_handle_t knet_handle;
 
        int link_mode;
 
        void *context;
 
        int (*totemknet_deliver_fn) (
                void *context,
                const void *msg,
                unsigned int msg_len,
                const struct sockaddr_storage *system_from);
 
        int (*totemknet_iface_change_fn) (
                void *context,
                const struct totem_ip_address *iface_address,
                unsigned int link_no);
 
        void (*totemknet_mtu_changed) (
                void *context,
                int net_mtu);
 
        void (*totemknet_target_set_completed) (void *context);
 
        /*
         * Function and data used to log messages
         */
        int totemknet_log_level_security;
 
        int totemknet_log_level_error;
 
        int totemknet_log_level_warning;
 
        int totemknet_log_level_notice;
 
        int totemknet_log_level_debug;
 
        int totemknet_subsys_id;
 
        int knet_subsys_id;
 
        void (*totemknet_log_printf) (
                int level,
                int subsys,
                const char *function,
                const char *file,
                int line,
                const char *format,
                ...)__attribute__((format(printf, 6, 7)));
 
        void *knet_context;
 
        char iov_buffer[KNET_IOV_LEN_MAX];
 
        char *link_status[INTERFACE_MAX];
 
        struct totem_ip_address my_ids[INTERFACE_MAX];
 
        uint16_t ip_port[INTERFACE_MAX];
 
        int our_nodeid;
 
        int loopback_link;
 
        struct totem_config *totem_config;
 
        struct totem_ip_address token_target;
 
        qb_loop_timer_handle timer_netif_check_timeout;
 
        qb_loop_timer_handle timer_merge_detect_timeout;
 
        int send_merge_detect_message;
 
        unsigned int merge_detect_messages_sent_before_timeout;
 
        int logpipes[2];
        int knet_fd;
 
        pthread_mutex_t log_mutex;
#ifdef HAVE_LIBNOZZLE
        char *nozzle_name;
        char *nozzle_ipaddr;
        char *nozzle_prefix;
        char *nozzle_macaddr;
        nozzle_t nozzle_handle;
#endif
};
 
/* Awkward. But needed to get stats from knet */
struct totemknet_instance *global_instance;
 
struct work_item {
        const void *msg;
        unsigned int msg_len;
        struct totemknet_instance *instance;
};
 
int totemknet_member_list_rebind_ip (
        void *knet_context);
 
 
static int totemknet_configure_compression (
        struct totemknet_instance *instance,
        struct totem_config *totem_config);
 
static void totemknet_start_merge_detect_timeout(
        void *knet_context);
 
static void totemknet_stop_merge_detect_timeout(
        void *knet_context);
 
static void log_flush_messages (
        void *knet_context);
 
static void totemknet_instance_initialize (struct totemknet_instance *instance)
{
        int res;
 
        memset (instance, 0, sizeof (struct totemknet_instance));
        res = pthread_mutex_init(&instance->log_mutex, NULL);
        /*
         * There is not too much else what can be done.
         */
        assert(res == 0);
}
 
#define knet_log_printf_lock(level, subsys, function, file, line, format, args...)      \
do {                                                                                    \
        (void)pthread_mutex_lock(&instance->log_mutex);                                 \
        instance->totemknet_log_printf (                                                \
                level, subsys, function, file, line,                                    \
                (const char *)format, ##args);                                          \
        (void)pthread_mutex_unlock(&instance->log_mutex);                               \
} while (0);
 
#define knet_log_printf(level, format, args...)         \
do {                                                    \
        knet_log_printf_lock (                          \
                level, instance->totemknet_subsys_id,   \
                __FUNCTION__, __FILE__, __LINE__,       \
                (const char *)format, ##args);          \
} while (0);
 
#define libknet_log_printf(level, format, args...)      \
do {                                                    \
        knet_log_printf_lock (                          \
                level, instance->knet_subsys_id,        \
                __FUNCTION__, "libknet.h", __LINE__,    \
                (const char *)format, ##args);          \
} while (0);
 
#define KNET_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->totemknet_log_printf (                                                        \
                level, instance->totemknet_subsys_id,                                           \
                __FUNCTION__, __FILE__, __LINE__,                                               \
                fmt ": %s (%d)", ##args, _error_ptr, err_num);                          \
        } while(0)
 
 
#ifdef HAVE_LIBNOZZLE
static inline uint8_t *ether_get_dst_mac(const unsigned char *packet, ssize_t packet_len)
{
        /*
         * Packet must be at least as long as one MAC address
         */
        if (packet_len < 6) {
                return NULL;
        }
 
        /*
         * To ensure portability, this implementation parses raw packet data directly
         * according to the Ethernet II standard.
         *
         * The system-provided struct ether_header is not used because its definition
         * and the location of its header file vary between platforms like Linux, BSD,
         * and Illumos. In the Ethernet II standard, the destination MAC address is
         * always the first 6 bytes of the frame.
         */
        return (uint8_t *)packet;
}
 
static inline int is_ether_addr_multicast(const uint8_t *addr)
{
        return (addr[0] & 0x01);
}
static inline int is_ether_addr_zero(const uint8_t *addr)
{
        return (!addr[0] && !addr[1] && !addr[2] && !addr[3] && !addr[4] && !addr[5]);
}
 
static int ether_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_host_id,
                                int8_t *channel,
                                knet_node_id_t *dst_host_ids,
                                size_t *dst_host_ids_entries)
{
        uint8_t *dst_mac = ether_get_dst_mac(outdata, outdata_len);
        uint16_t dst_host_id;
 
        if (dst_mac == NULL) {
                return -1;
        }
 
        if (is_ether_addr_zero(dst_mac))
                return -1;
 
        if (is_ether_addr_multicast(dst_mac)) {
                return 1;
        }
 
        memmove(&dst_host_id, &dst_mac[4], 2);
 
        dst_host_ids[0] = ntohs(dst_host_id);
        *dst_host_ids_entries = 1;
 
        return 0;
}
#endif
 
static int dst_host_filter_callback_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_host_id,
                                       int8_t *channel,
                                       knet_node_id_t *dst_host_ids,
                                       size_t *dst_host_ids_entries)
{
        struct totem_message_header *header = (struct totem_message_header *)outdata;
        int res;
 
#ifdef HAVE_LIBNOZZLE
        if (*channel != 0) {
                return ether_host_filter_fn(private_data,
                                            outdata, outdata_len,
                                            tx_rx,
                                            this_host_id, src_host_id,
                                            channel,
                                            dst_host_ids,
                                            dst_host_ids_entries);
        }
#endif
        if (header->target_nodeid) {
                dst_host_ids[0] = header->target_nodeid;
                *dst_host_ids_entries = 1;
                res = 0; /* unicast message */
        }
        else {
                *dst_host_ids_entries = 0;
                res = 1; /* multicast message */
        }
        return res;
}
 
static void socket_error_callback_fn(void *private_data, int datafd, int8_t channel, uint8_t tx_rx, int error, int errorno)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)private_data;
 
        knet_log_printf (LOGSYS_LEVEL_DEBUG, "Knet socket ERROR notification called: txrx=%d, error=%d, errorno=%d", tx_rx, error, errorno);
        if ((error == -1 && errorno != EAGAIN) || (error == 0)) {
                knet_handle_remove_datafd(instance->knet_handle, datafd);
        }
}
 
static void host_change_callback_fn(void *private_data, knet_node_id_t host_id, uint8_t reachable, uint8_t remote, uint8_t external)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)private_data;
 
        // TODO: what? if anything.
        knet_log_printf (LOGSYS_LEVEL_DEBUG, "Knet host change callback. nodeid: " CS_PRI_NODE_ID " reachable: %d", host_id, reachable);
}
 
static void pmtu_change_callback_fn(void *private_data, unsigned int data_mtu)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)private_data;
        knet_log_printf (LOGSYS_LEVEL_DEBUG, "Knet pMTU change: %d", data_mtu);
 
        /* We don't need to tell corosync the actual knet MTU */
//      instance->totemknet_mtu_changed(instance->context, data_mtu);
}
 
int totemknet_crypto_set (
        void *knet_context,
        const char *cipher_type,
        const char *hash_type)
{
        return (0);
}
 
 
static inline void ucast_sendmsg (
        struct totemknet_instance *instance,
        struct totem_ip_address *system_to,
        const void *msg,
        unsigned int msg_len)
{
        int res = 0;
        struct totem_message_header *header = (struct totem_message_header *)msg;
        struct msghdr msg_ucast;
        struct iovec iovec;
 
        header->target_nodeid = system_to->nodeid;
 
        iovec.iov_base = (void *)msg;
        iovec.iov_len = msg_len;
 
        /*
         * Build unicast message
         */
        memset(&msg_ucast, 0, sizeof(msg_ucast));
        msg_ucast.msg_iov = (void *)&iovec;
        msg_ucast.msg_iovlen = 1;
 
        /*
         * Transmit unicast message
         * An error here is recovered by totemsrp
         */
 
        res = sendmsg (instance->knet_fd, &msg_ucast, MSG_NOSIGNAL);
        if (res < 0) {
                KNET_LOGSYS_PERROR (errno, instance->totemknet_log_level_debug,
                                    "sendmsg(ucast) failed (non-critical)");
        }
}
 
static inline void mcast_sendmsg (
        struct totemknet_instance *instance,
        const void *msg,
        unsigned int msg_len,
        int only_active)
{
        int res;
        struct totem_message_header *header = (struct totem_message_header *)msg;
        struct msghdr msg_mcast;
        struct iovec iovec;
 
        iovec.iov_base = (void *)msg;
        iovec.iov_len = msg_len;
 
        header->target_nodeid = 0;
 
        /*
         * Build multicast message
         */
        memset(&msg_mcast, 0, sizeof(msg_mcast));
        msg_mcast.msg_iov = (void *)&iovec;
        msg_mcast.msg_iovlen = 1;
 
//      log_printf (LOGSYS_LEVEL_DEBUG, "totemknet: mcast_sendmsg. only_active=%d, len=%d", only_active, msg_len);
 
        res = sendmsg (instance->knet_fd, &msg_mcast, MSG_NOSIGNAL);
        if (res < msg_len) {
                knet_log_printf (LOGSYS_LEVEL_DEBUG, "totemknet: mcast_send sendmsg returned %d", res);
        }
 
        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;
        }
}
 
static int node_compare(const void *aptr, const void *bptr)
{
        uint16_t a,b;
 
        a = *(uint16_t *)aptr;
        b = *(uint16_t *)bptr;
 
        return a > b;
}
 
#ifndef OWN_INDEX_NONE
#define OWN_INDEX_NONE -1
#endif
 
int totemknet_nodestatus_get (
        void *knet_context,
        unsigned int nodeid,
        struct totem_node_status *node_status)
{
        int i;
        int res = 0;
        struct knet_link_status link_status;
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        struct knet_host_status knet_host_status;
        uint8_t link_list[KNET_MAX_LINK];
        size_t num_links;
 
        if (!instance->knet_handle) {
                return CS_ERR_NOT_EXIST; /* Not using knet */
        }
 
        if (!node_status) {
                return CS_ERR_INVALID_PARAM;
        }
 
        res = knet_host_get_status(instance->knet_handle,
                                   nodeid,
                                   &knet_host_status);
        if (res) {
                knet_log_printf (LOGSYS_LEVEL_WARNING, "knet_handle_get_host_status(%d) failed: %d", nodeid, res);
                return (-1);
        }
        node_status->nodeid = nodeid;
        node_status->reachable = knet_host_status.reachable;
        node_status->remote = knet_host_status.remote;
        node_status->external = knet_host_status.external;
 
#ifdef HAVE_KNET_ONWIRE_VER
        res = knet_handle_get_onwire_ver(instance->knet_handle,
                                         nodeid,
                                         &node_status->onwire_min,
                                         &node_status->onwire_max,
                                         &node_status->onwire_ver);
        if (res) {
                knet_log_printf (LOGSYS_LEVEL_WARNING, "knet_handle_get_onwire_ver(%d) failed: %d", nodeid, res);
                return (-1);
        }
#endif
        /* Get link info */
        res = knet_link_get_link_list(instance->knet_handle,
                                      nodeid, link_list, &num_links);
        if (res) {
                knet_log_printf (LOGSYS_LEVEL_WARNING, "knet_link_get_link_list(%d) failed: %d", nodeid, res);
                return (-1);
        }
 
        /* node_status[] has been zeroed for us in totempg.c */
        for (i=0; i < num_links; i++) {
                if (!instance->totem_config->interfaces[link_list[i]].configured) {
                        continue;
                }
                res = knet_link_get_status(instance->knet_handle,
                                           nodeid,
                                           link_list[i],
                                           &link_status,
                                           sizeof(link_status));
                if (res == 0) {
                        node_status->link_status[link_list[i]].enabled = link_status.enabled;
                        node_status->link_status[link_list[i]].connected = link_status.connected;
                        node_status->link_status[link_list[i]].dynconnected = link_status.dynconnected;
                        node_status->link_status[link_list[i]].mtu = link_status.mtu;
                        memcpy(node_status->link_status[link_list[i]].src_ipaddr, link_status.src_ipaddr, KNET_MAX_HOST_LEN);
                        memcpy(node_status->link_status[link_list[i]].dst_ipaddr, link_status.dst_ipaddr, KNET_MAX_HOST_LEN);
                } else {
                        knet_log_printf (LOGSYS_LEVEL_WARNING, "knet_link_get_link_status(%d, %d) failed: %d", nodeid, link_list[i], res);
                }
        }
        return res;
}
 
 
 
int totemknet_ifaces_get (void *knet_context,
        char ***status,
        unsigned int *iface_count)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        struct knet_link_status link_status;
        knet_node_id_t host_list[KNET_MAX_HOST];
        uint8_t link_list[KNET_MAX_LINK];
        size_t num_hosts;
        size_t num_links;
        size_t link_idx;
        int i,j;
        char *ptr;
        int res = 0;
 
        /*
         * Don't do the whole 'link_info' bit if the caller just wants
         * a count of interfaces.
         */
        if (status) {
                int own_idx = OWN_INDEX_NONE;
 
                res = knet_host_get_host_list(instance->knet_handle,
                                              host_list, &num_hosts);
                if (res) {
                        return (-1);
                }
                qsort(host_list, num_hosts, sizeof(uint16_t), node_compare);
 
                for (j=0; j<num_hosts; j++) {
                        if (host_list[j] == instance->our_nodeid) {
                                own_idx = j;
                                break;
                        }
                }
 
                for (i=0; i<INTERFACE_MAX; i++) {
                        memset(instance->link_status[i], 'd', CFG_INTERFACE_STATUS_MAX_LEN-1);
                        if (own_idx != OWN_INDEX_NONE) {
                                instance->link_status[i][own_idx] = 'n';
                        }
                        instance->link_status[i][num_hosts] = '\0';
                }
 
                /* This is all a bit "inside-out" because "status" is a set of strings per link
                 * and knet orders things by host
                 */
                for (j=0; j<num_hosts; j++) {
                        if (own_idx != OWN_INDEX_NONE && j == own_idx) {
                                continue ;
                        }
 
                        res = knet_link_get_link_list(instance->knet_handle,
                                                      host_list[j], link_list, &num_links);
                        if (res) {
                                return (-1);
                        }
 
                        link_idx = 0;
                        for (i=0; i < num_links; i++) {
                                /*
                                 * Skip over links that are unconfigured to corosync. This is basically
                                 * link0 if corosync isn't using it for comms, as we will still
                                 * have it set up for loopback.
                                 */
                                if (!instance->totem_config->interfaces[link_list[i]].configured) {
                                        continue;
                                }
                                ptr = instance->link_status[link_idx++];
 
                                res = knet_link_get_status(instance->knet_handle,
                                                           host_list[j],
                                                           link_list[i],
                                                           &link_status,
                                                           sizeof(link_status));
                                if (res == 0) {
                                        ptr[j] = '0' + (link_status.enabled |
                                                        link_status.connected<<1 |
                                                        link_status.dynconnected<<2);
                                }
                                else {
                                        knet_log_printf (LOGSYS_LEVEL_ERROR,
                                            "totemknet_ifaces_get: Cannot get link status: %s", strerror(errno));
                                        ptr[j] = '?';
                                }
                        }
                }
                *status = instance->link_status;
        }
 
        *iface_count = INTERFACE_MAX;
 
        return (res);
}
 
int totemknet_finalize (
        void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res = 0;
        int i,j;
        static knet_node_id_t nodes[KNET_MAX_HOST]; /* static to save stack */
        uint8_t links[KNET_MAX_LINK];
        size_t num_nodes;
        size_t num_links;
 
        knet_log_printf(LOG_DEBUG, "totemknet: finalize");
 
        qb_loop_poll_del (instance->poll_handle, instance->logpipes[0]);
        qb_loop_poll_del (instance->poll_handle, instance->knet_fd);
 
        /*
         * Disable forwarding to make knet flush send queue. This ensures that the LEAVE message will be sent.
         */
        res = knet_handle_setfwd(instance->knet_handle, 0);
        if (res) {
                knet_log_printf (LOGSYS_LEVEL_CRIT, "totemknet: knet_handle_setfwd failed: %s", strerror(errno));
        }
 
        res = knet_host_get_host_list(instance->knet_handle, nodes, &num_nodes);
        if (res) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Cannot get knet node list for shutdown: %s", strerror(errno));
                /* Crash out anyway */
                goto finalise_error;
        }
 
        /* Tidily shut down all nodes & links. */
        for (i=0; i<num_nodes; i++) {
 
                res = knet_link_get_link_list(instance->knet_handle, nodes[i], links, &num_links);
                if (res) {
                        knet_log_printf (LOGSYS_LEVEL_ERROR, "Cannot get knet link list for node " CS_PRI_NODE_ID ": %s", nodes[i], strerror(errno));
                        goto finalise_error;
                }
                for (j=0; j<num_links; j++) {
                        res = knet_link_set_enable(instance->knet_handle, nodes[i], links[j], 0);
                        if (res) {
                                knet_log_printf (LOGSYS_LEVEL_ERROR, "totemknet: knet_link_set_enable(node " CS_PRI_NODE_ID ", link %d) failed: %s", nodes[i], links[j], strerror(errno));
                        }
                        res = knet_link_clear_config(instance->knet_handle, nodes[i], links[j]);
                        if (res) {
                                knet_log_printf (LOGSYS_LEVEL_ERROR, "totemknet: knet_link_clear_config(node " CS_PRI_NODE_ID ", link %d) failed: %s", nodes[i], links[j], strerror(errno));
                        }
                }
                res = knet_host_remove(instance->knet_handle, nodes[i]);
                if (res) {
                        knet_log_printf (LOGSYS_LEVEL_ERROR, "totemknet: knet_host_remove(node " CS_PRI_NODE_ID ") failed: %s", nodes[i], strerror(errno));
                }
        }
 
finalise_error:
        res = knet_handle_free(instance->knet_handle);
        if (res) {
                knet_log_printf (LOGSYS_LEVEL_CRIT, "totemknet: knet_handle_free failed: %s", strerror(errno));
        }
 
        totemknet_stop_merge_detect_timeout(instance);
 
        log_flush_messages(instance);
 
        /*
         * Error is deliberately ignored
         */
        (void)pthread_mutex_destroy(&instance->log_mutex);
 
        return (res);
}
 
static int log_deliver_fn (
        int fd,
        int revents,
        void *data)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)data;
        char buffer[sizeof(struct knet_log_msg)*4];
        char *bufptr = buffer;
        int done = 0;
        int len;
 
        len = read(fd, buffer, sizeof(buffer));
        while (done < len) {
                struct knet_log_msg *msg = (struct knet_log_msg *)bufptr;
                switch (msg->msglevel) {
                case KNET_LOG_ERR:
                        libknet_log_printf (LOGSYS_LEVEL_ERROR, "%s: %s",
                                            knet_log_get_subsystem_name(msg->subsystem),
                                            msg->msg);
                        break;
                case KNET_LOG_WARN:
                        libknet_log_printf (LOGSYS_LEVEL_WARNING, "%s: %s",
                                            knet_log_get_subsystem_name(msg->subsystem),
                                            msg->msg);
                        break;
                case KNET_LOG_INFO:
                        libknet_log_printf (LOGSYS_LEVEL_INFO, "%s: %s",
                                            knet_log_get_subsystem_name(msg->subsystem),
                                            msg->msg);
                        break;
                case KNET_LOG_DEBUG:
                        libknet_log_printf (LOGSYS_LEVEL_DEBUG, "%s: %s",
                                            knet_log_get_subsystem_name(msg->subsystem),
                                            msg->msg);
                        break;
#ifdef KNET_LOG_TRACE
                case KNET_LOG_TRACE:
                        libknet_log_printf (LOGSYS_LEVEL_TRACE, "%s: %s",
                                            knet_log_get_subsystem_name(msg->subsystem),
                                            msg->msg);
                        break;
#endif
                }
                bufptr += sizeof(struct knet_log_msg);
                done += sizeof(struct knet_log_msg);
        }
        return 0;
}
 
static int data_deliver_fn (
        int fd,
        int revents,
        void *data)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)data;
        struct msghdr msg_hdr;
        struct iovec iov_recv;
        struct sockaddr_storage system_from;
        ssize_t msg_len;
        char *data_ptr = instance->iov_buffer;
 
        iov_recv.iov_base = instance->iov_buffer;
        iov_recv.iov_len = KNET_IOV_LEN_MAX;
 
        memset(&msg_hdr, 0, sizeof(msg_hdr));
        msg_hdr.msg_name = &system_from;
        msg_hdr.msg_namelen = sizeof (struct sockaddr_storage);
        msg_hdr.msg_iov = &iov_recv;
        msg_hdr.msg_iovlen = 1;
 
        msg_len = recvmsg (fd, &msg_hdr, MSG_NOSIGNAL | MSG_DONTWAIT);
        if (msg_len <= 0) {
                return (0);
        }
 
        if (msg_len >= KNET_IOV_LEN_MAX) {
                /*
                 * It this happens it is real bug, because knet always sends packet with maximum size
                 * of KNET_MAX_PACKET_SIZE.
                 * If received packet is MAX_PACKET_SIZE + 1 it means packet was truncated
                 * (iov_buffer size and iov_len are intentionally set to KNET_MAX_PACKET_SIZE + 1).
                 */
                knet_log_printf(instance->totemknet_log_level_error,
                                "Received truncated packet. Please report this bug. Dropping packet.");
                return (0);
        }
 
        /*
         * If it's from the knet fd then it will have the optional knet header on it
         */
#ifdef KNET_DATAFD_FLAG_RX_RETURN_INFO
        if (fd == instance->knet_fd) {
                struct knet_datafd_header *datafd_header = (struct knet_datafd_header *)data_ptr;
 
/*              knet_log_printf (LOGSYS_LEVEL_DEBUG, "Packet from knet_fd nodeid: %d\n", datafd_header->src_nodeid); */
 
                /* Advance past the ACTUAL header size, not the size we think it might be */
                data_ptr += datafd_header->size;
                msg_len -= datafd_header->size;
        }
#endif
 
 
        /*
         * Handle incoming message
         */
        instance->totemknet_deliver_fn (
                instance->context,
                data_ptr,
                msg_len,
                &system_from);
 
        return (0);
}
 
static void timer_function_netif_check_timeout (
        void *data)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)data;
        int i;
        int res = 0;
 
        for (i=0; i < INTERFACE_MAX; i++) {
                if (!instance->totem_config->interfaces[i].configured) {
                        continue;
                }
                res = instance->totemknet_iface_change_fn (instance->context,
                                                           &instance->my_ids[i],
                                                           i);
        }
        if (res != 0) {
                /* This is only called at startup, so we can quit here.
                   Refresh takes a different path */
                corosync_exit_error(COROSYNC_DONE_MAINCONFIGREAD);
        }
}
 
static void knet_set_access_list_config(struct totemknet_instance *instance)
{
#ifdef HAVE_KNET_ACCESS_LIST
        uint32_t value;
        cs_error_t err;
 
        value = instance->totem_config->block_unlisted_ips;
        knet_log_printf (LOGSYS_LEVEL_DEBUG, "knet_enable access list: %d", value);
 
        err = knet_handle_enable_access_lists(instance->knet_handle, value);
        if (err) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_enable_access_lists failed");
        }
#endif
}
 
void totemknet_configure_log_level(void)
{
        int logsys_log_mode;
        int knet_log_mode = KNET_LOG_INFO;
        uint8_t s;
        int err;
 
        if (!global_instance || !global_instance->knet_handle) {
                return;
        }
 
        /* Reconfigure logging level */
        logsys_log_mode = logsys_config_debug_get("KNET");
 
        switch (logsys_log_mode) {
                case LOGSYS_DEBUG_OFF:
                        knet_log_mode = KNET_LOG_INFO;
                        break;
                case LOGSYS_DEBUG_ON:
                        knet_log_mode = KNET_LOG_DEBUG;
                        break;
                case LOGSYS_DEBUG_TRACE:
#ifdef KNET_LOG_TRACE
                        knet_log_mode = KNET_LOG_TRACE;
#else
                        knet_log_mode = KNET_LOG_DEBUG;
#endif
                        break;
        }
        log_printf (LOGSYS_LEVEL_DEBUG, "totemknet setting log level %s", knet_log_get_loglevel_name(knet_log_mode));
        err = 0;
        for (s = 0; s<KNET_MAX_SUBSYSTEMS; s++) {
                err = knet_log_set_loglevel(global_instance->knet_handle, s, knet_log_mode);
        }
 
        /* If one fails, they all fail. no point in issuing KNET_MAX_SUBSYSTEMS errors */
        if (err) {
                log_printf (LOGSYS_LEVEL_ERROR, "totemknet failed to set log level: %s", strerror(errno));
        }
}
 
 
/* NOTE: this relies on the fact that totem_reload_notify() is called first */
static void totemknet_refresh_config(
        int32_t event,
        const char *key_name,
        struct icmap_notify_value new_val,
        struct icmap_notify_value old_val,
        void *user_data)
{
        uint8_t reloading;
        int after_reload;
        uint32_t link_no;
        size_t num_nodes;
        knet_node_id_t host_ids[KNET_MAX_HOST];
        int i;
        int err;
        struct totemknet_instance *instance = (struct totemknet_instance *)user_data;
 
        ENTER();
 
        /*
         * If a full reload is in progress then don't do anything until it's done and
         * can reconfigure it all atomically
         */
        if (icmap_get_uint8("config.totemconfig_reload_in_progress", &reloading) == CS_OK && reloading) {
                return;
        }
 
        after_reload = (strcmp(key_name, "config.totemconfig_reload_in_progress") == 0);
 
        knet_set_access_list_config(instance);
 
        if (strcmp(key_name, "totem.knet_pmtud_interval") == 0 || after_reload) {
                knet_log_printf (LOGSYS_LEVEL_DEBUG, "knet_pmtud_interval now %u",
                    instance->totem_config->knet_pmtud_interval);
                err = knet_handle_pmtud_setfreq(instance->knet_handle, instance->totem_config->knet_pmtud_interval);
                if (err) {
                        KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_pmtud_setfreq failed");
                }
        }
 
        if (strcmp(key_name, "totem.knet_mtu") == 0 || after_reload) {
                knet_log_printf (LOGSYS_LEVEL_DEBUG, "knet_mtu now %u", instance->totem_config->knet_mtu);
                err = knet_handle_pmtud_set(instance->knet_handle, instance->totem_config->knet_mtu);
                if (err) {
                        KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_pmtud failed");
                }
        }
 
        /* Configure link parameters for each node */
        err = knet_host_get_host_list(instance->knet_handle, host_ids, &num_nodes);
        if (err != 0) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_host_get_host_list failed");
        }
 
        for (i=0; i<num_nodes; i++) {
                int linkerr = 0;
                for (link_no = 0; link_no < INTERFACE_MAX; link_no++) {
                        if (host_ids[i] == instance->our_nodeid || !instance->totem_config->interfaces[link_no].configured) {
                                continue;
                        }
 
                        err = knet_link_set_ping_timers(instance->knet_handle, host_ids[i], link_no,
                                                        instance->totem_config->interfaces[link_no].knet_ping_interval,
                                                        instance->totem_config->interfaces[link_no].knet_ping_timeout,
                                                        instance->totem_config->interfaces[link_no].knet_ping_precision);
                        if (err) {
                                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set_ping_timers for node " CS_PRI_NODE_ID " link %d failed", host_ids[i], link_no);
                                linkerr = err;
                        }
                        err = knet_link_set_pong_count(instance->knet_handle, host_ids[i], link_no,
                                                       instance->totem_config->interfaces[link_no].knet_pong_count);
                        if (err) {
                                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set_pong_count for node " CS_PRI_NODE_ID " link %d failed",host_ids[i], link_no);
                                linkerr = err;
                        }
                        err = knet_link_set_priority(instance->knet_handle, host_ids[i], link_no,
                                                     instance->totem_config->interfaces[link_no].knet_link_priority);
                        if (err) {
                                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set_priority for node " CS_PRI_NODE_ID " link %d failed", host_ids[i], link_no);
                                linkerr = err;
                        }
 
                }
                if (linkerr) {
                        icmap_set_string("config.reload_error_message", "Failed to set knet ping timers(2)");
                }
        }
 
        /* Log levels get reconfigured from logconfig.c as that happens last in the reload */
        LEAVE();
}
 
static void totemknet_add_config_notifications(struct totemknet_instance *instance)
{
        icmap_track_t icmap_track_totem = NULL;
        icmap_track_t icmap_track_reload = NULL;
 
        ENTER();
 
        icmap_track_add("totem.",
                ICMAP_TRACK_ADD | ICMAP_TRACK_DELETE | ICMAP_TRACK_MODIFY | ICMAP_TRACK_PREFIX,
                totemknet_refresh_config,
                instance,
                &icmap_track_totem);
 
        icmap_track_add("config.totemconfig_reload_in_progress",
                ICMAP_TRACK_ADD | ICMAP_TRACK_MODIFY,
                totemknet_refresh_config,
                instance,
                &icmap_track_reload);
 
        LEAVE();
}
 
static int totemknet_is_crypto_enabled(const struct totemknet_instance *instance)
{
 
        return (!(strcmp(instance->totem_config->crypto_cipher_type, "none") == 0 &&
            strcmp(instance->totem_config->crypto_hash_type, "none") == 0));
 
}
 
static int totemknet_set_knet_crypto(struct totemknet_instance *instance)
{
        struct knet_handle_crypto_cfg crypto_cfg;
        int res;
 
        /* These have already been validated */
        memcpy(crypto_cfg.crypto_model, instance->totem_config->crypto_model, sizeof(crypto_cfg.crypto_model));
        memcpy(crypto_cfg.crypto_cipher_type, instance->totem_config->crypto_cipher_type, sizeof(crypto_cfg.crypto_model));
        memcpy(crypto_cfg.crypto_hash_type, instance->totem_config->crypto_hash_type, sizeof(crypto_cfg.crypto_model));
        memcpy(crypto_cfg.private_key, instance->totem_config->private_key, instance->totem_config->private_key_len);
        crypto_cfg.private_key_len = instance->totem_config->private_key_len;
 
#ifdef HAVE_KNET_CRYPTO_RECONF
 
        knet_log_printf(LOGSYS_LEVEL_DEBUG, "Configuring crypto %s/%s/%s on index %d",
                        crypto_cfg.crypto_model,
                        crypto_cfg.crypto_cipher_type,
                        crypto_cfg.crypto_hash_type,
                        instance->totem_config->crypto_index
                );
 
        /* If crypto is being disabled we need to explicitly allow cleartext traffic in knet */
        if (!totemknet_is_crypto_enabled(instance)) {
                res = knet_handle_crypto_rx_clear_traffic(instance->knet_handle, KNET_CRYPTO_RX_ALLOW_CLEAR_TRAFFIC);
                if (res) {
                        knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto_rx_clear_traffic(ALLOW) failed %s", strerror(errno));
                }
        }
 
        /* use_config will be called later when all nodes are synced */
        res = knet_handle_crypto_set_config(instance->knet_handle, &crypto_cfg, instance->totem_config->crypto_index);
        if (res == 0) {
                /* Keep a copy in case it fails in future */
                memcpy(&instance->last_good_crypto_cfg, &crypto_cfg, sizeof(crypto_cfg));
        }
        if (res == -1) {
                knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto_set_config (index %d) failed: %s", instance->totem_config->crypto_index, strerror(errno));
                goto exit_error;
        }
        if (res == -2) {
                knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto_set_config (index %d) failed: -2", instance->totem_config->crypto_index);
                goto exit_error;
        }
#else
        knet_log_printf(LOGSYS_LEVEL_DEBUG, "Configuring crypto %s/%s/%s",
                        crypto_cfg.crypto_model,
                        crypto_cfg.crypto_cipher_type,
                        crypto_cfg.crypto_hash_type
                );
 
        res = knet_handle_crypto(instance->knet_handle, &crypto_cfg);
        if (res == -1) {
        knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto failed: %s", strerror(errno));
                goto exit_error;
        }
        if (res == -2) {
                knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto failed: -2");
                goto exit_error;
        }
#endif
 
exit_error:
#ifdef HAVE_KNET_CRYPTO_RECONF
        if (res) {
                icmap_set_string("config.reload_error_message", "Failed to set crypto parameters");
 
                /* Restore the old values in cmap & totem_config */
                icmap_set_string("totem.crypto_cipher", instance->last_good_crypto_cfg.crypto_cipher_type);
                icmap_set_string("totem.crypto_hash",  instance->last_good_crypto_cfg.crypto_hash_type);
                icmap_set_string("totem.crypto_model",  instance->last_good_crypto_cfg.crypto_model);
 
                memcpy(instance->totem_config->crypto_hash_type, instance->last_good_crypto_cfg.crypto_hash_type,
                       sizeof(instance->last_good_crypto_cfg.crypto_hash_type));
                memcpy(instance->totem_config->crypto_cipher_type, instance->last_good_crypto_cfg.crypto_cipher_type,
                       sizeof(instance->last_good_crypto_cfg.crypto_cipher_type));
                memcpy(instance->totem_config->crypto_model, instance->last_good_crypto_cfg.crypto_model,
                       sizeof(instance->last_good_crypto_cfg.crypto_model));
        }
#endif
        return res;
}
 
/*
 * Create an instance
 */
int totemknet_initialize (
        qb_loop_t *poll_handle,
        void **knet_context,
        struct totem_config *totem_config,
        totemsrp_stats_t *stats,
        void *context,
 
        int (*deliver_fn) (
                void *context,
                const void *msg,
                unsigned int msg_len,
                const struct sockaddr_storage *system_from),
 
        int (*iface_change_fn) (
                void *context,
                const struct totem_ip_address *iface_address,
                unsigned int link_no),
 
        void (*mtu_changed) (
                void *context,
                int net_mtu),
 
        void (*target_set_completed) (
                void *context))
{
        struct totemknet_instance *instance;
        char *tmp_str;
        int8_t channel=0;
        int allow_knet_handle_fallback=0;
        int res;
        int i;
 
        instance = malloc (sizeof (struct totemknet_instance));
        if (instance == NULL) {
                return (-1);
        }
 
        totemknet_instance_initialize (instance);
 
        instance->totem_config = totem_config;
 
        /*
        * Configure logging
        */
        instance->totemknet_log_level_security = 1; //totem_config->totem_logging_configuration.log_level_security;
        instance->totemknet_log_level_error = totem_config->totem_logging_configuration.log_level_error;
        instance->totemknet_log_level_warning = totem_config->totem_logging_configuration.log_level_warning;
        instance->totemknet_log_level_notice = totem_config->totem_logging_configuration.log_level_notice;
        instance->totemknet_log_level_debug = totem_config->totem_logging_configuration.log_level_debug;
        instance->totemknet_subsys_id = totem_config->totem_logging_configuration.log_subsys_id;
        instance->totemknet_log_printf = totem_config->totem_logging_configuration.log_printf;
 
        instance->knet_subsys_id = _logsys_subsys_create("KNET", "libknet.h");
 
        /*
         * Initialize local variables for totemknet
         */
 
        instance->our_nodeid = instance->totem_config->node_id;
 
        for (i=0; i< INTERFACE_MAX; i++) {
                totemip_copy(&instance->my_ids[i], &totem_config->interfaces[i].bindnet);
                instance->my_ids[i].nodeid = instance->our_nodeid;
                instance->ip_port[i] = totem_config->interfaces[i].ip_port;
 
                /* Needed for totemsrp */
                totem_config->interfaces[i].boundto.nodeid = instance->our_nodeid;
        }
 
        instance->poll_handle = poll_handle;
 
        instance->context = context;
        instance->totemknet_deliver_fn = deliver_fn;
 
        instance->totemknet_iface_change_fn = iface_change_fn;
 
        instance->totemknet_mtu_changed = mtu_changed;
 
        instance->totemknet_target_set_completed = target_set_completed;
 
        instance->loopback_link = 0;
 
        res = pipe(instance->logpipes);
        if (res == -1) {
            KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_CRIT, "failed to create pipe for instance->logpipes");
            goto exit_error;
        }
        if (fcntl(instance->logpipes[0], F_SETFL, O_NONBLOCK) == -1 ||
            fcntl(instance->logpipes[1], F_SETFL, O_NONBLOCK) == -1) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_CRIT, "failed to set O_NONBLOCK flag for instance->logpipes");
                goto exit_error;
        }
 
        if (icmap_get_string("system.allow_knet_handle_fallback", &tmp_str) == CS_OK) {
                if (strcmp(tmp_str, "yes") == 0) {
                        allow_knet_handle_fallback = 1;
                }
                free(tmp_str);
        }
 
#if defined(KNET_API_VER) && (KNET_API_VER == 2)
        instance->knet_handle = knet_handle_new(instance->totem_config->node_id, instance->logpipes[1], KNET_LOG_DEBUG, KNET_HANDLE_FLAG_PRIVILEGED);
#else
        instance->knet_handle = knet_handle_new(instance->totem_config->node_id, instance->logpipes[1], KNET_LOG_DEBUG);
#endif
 
        if (allow_knet_handle_fallback && !instance->knet_handle && errno == ENAMETOOLONG) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_new failed, trying unprivileged");
#if defined(KNET_API_VER) && (KNET_API_VER == 2)
                instance->knet_handle = knet_handle_new(instance->totem_config->node_id, instance->logpipes[1], KNET_LOG_DEBUG, 0);
#else
                instance->knet_handle = knet_handle_new_ex(instance->totem_config->node_id, instance->logpipes[1], KNET_LOG_DEBUG, 0);
#endif
        }
 
        if (!instance->knet_handle) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_CRIT, "knet_handle_new failed");
                goto exit_error;
        }
 
        knet_set_access_list_config(instance);
 
        res = knet_handle_pmtud_setfreq(instance->knet_handle, instance->totem_config->knet_pmtud_interval);
        if (res) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_pmtud_setfreq failed");
        }
        res = knet_handle_pmtud_set(instance->knet_handle, instance->totem_config->knet_mtu);
        if (res) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_pmtud_set failed");
        }
#ifdef HAVE_KNET_SETPRIO_DSCP
        res = knet_handle_setprio_dscp(instance->knet_handle, instance->totem_config->ip_dscp);
        if (res) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_setprio_dscp failed");
        }
#else
        if (instance->totem_config->ip_dscp) {
                knet_log_printf(LOGSYS_LEVEL_WARNING, "Ignoring 'ip_dscp' option: Corosync was"
                  " compiled without knet_handle_setprio_dscp support.");
        }
#endif
        res = knet_handle_enable_filter(instance->knet_handle, instance, dst_host_filter_callback_fn);
        if (res) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_enable_filter failed");
        }
        res = knet_handle_enable_sock_notify(instance->knet_handle, instance, socket_error_callback_fn);
        if (res) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_enable_sock_notify failed");
        }
        res = knet_host_enable_status_change_notify(instance->knet_handle, instance, host_change_callback_fn);
        if (res) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_host_enable_status_change_notify failed");
        }
        res = knet_handle_enable_pmtud_notify(instance->knet_handle, instance, pmtu_change_callback_fn);
        if (res) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_WARNING, "knet_handle_enable_pmtud_notify failed");
        }
        global_instance = instance;
 
        /* Setup knet logging level */
        totemknet_configure_log_level();
 
        /* Get an fd into knet */
        instance->knet_fd = 0;
#ifdef KNET_DATAFD_FLAG_RX_RETURN_INFO
        res = knet_handle_add_datafd(instance->knet_handle, &instance->knet_fd, &channel, KNET_DATAFD_FLAG_RX_RETURN_INFO);
#else
        res = knet_handle_add_datafd(instance->knet_handle, &instance->knet_fd, &channel);
#endif
        if (res) {
                knet_log_printf(LOG_DEBUG, "knet_handle_add_datafd failed: %s", strerror(errno));
                goto exit_error;
        }
 
        /* Enable crypto if requested */
#ifdef HAVE_KNET_CRYPTO_RECONF
        if (totemknet_is_crypto_enabled(instance)) {
                res = totemknet_set_knet_crypto(instance);
                if (res == 0) {
                        res = knet_handle_crypto_use_config(instance->knet_handle, totem_config->crypto_index);
                        if (res) {
                                knet_log_printf(LOG_DEBUG, "knet_handle_crypto_use_config failed: %s", strerror(errno));
                                goto exit_error;
                        }
                } else {
                        knet_log_printf(LOG_DEBUG, "Failed to set up knet crypto");
                        goto exit_error;
                }
                res = knet_handle_crypto_rx_clear_traffic(instance->knet_handle, KNET_CRYPTO_RX_DISALLOW_CLEAR_TRAFFIC);
                if (res) {
                        knet_log_printf(LOG_DEBUG, "knet_handle_crypto_rx_clear_traffic (DISALLOW) failed: %s", strerror(errno));
                        goto exit_error;
                }
 
        } else {
                res = knet_handle_crypto_rx_clear_traffic(instance->knet_handle, KNET_CRYPTO_RX_ALLOW_CLEAR_TRAFFIC);
                if (res) {
                        knet_log_printf(LOG_DEBUG, "knet_handle_crypto_rx_clear_traffic (ALLOW) failed: %s", strerror(errno));
                        goto exit_error;
                }
        }
#else
        if (totemknet_is_crypto_enabled(instance)) {
                res = totemknet_set_knet_crypto(instance);
                if (res) {
                        knet_log_printf(LOG_DEBUG, "Failed to set up knet crypto");
                        goto exit_error;
                }
        }
#endif
 
        /* Set up compression */
        if (strcmp(totem_config->knet_compression_model, "none") != 0) {
                /* Not fatal, but will log */
                (void)totemknet_configure_compression(instance, totem_config);
        }
 
        knet_handle_setfwd(instance->knet_handle, 1);
 
        instance->link_mode = KNET_LINK_POLICY_PASSIVE;
        if (strcmp(instance->totem_config->link_mode, "active")==0) {
                instance->link_mode = KNET_LINK_POLICY_ACTIVE;
        }
        if (strcmp(instance->totem_config->link_mode, "rr")==0) {
                instance->link_mode = KNET_LINK_POLICY_RR;
        }
 
        for (i=0; i<INTERFACE_MAX; i++) {
                instance->link_status[i] = malloc(CFG_INTERFACE_STATUS_MAX_LEN);
                if (!instance->link_status[i]) {
                        goto exit_error;
                }
        }
 
        qb_loop_poll_add (instance->poll_handle,
                QB_LOOP_MED,
                instance->logpipes[0],
                POLLIN, instance, log_deliver_fn);
 
        qb_loop_poll_add (instance->poll_handle,
                QB_LOOP_HIGH,
                instance->knet_fd,
                POLLIN, instance, data_deliver_fn);
 
        /*
         * Upper 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->poll_handle,
                QB_LOOP_MED,
                100*QB_TIME_NS_IN_MSEC,
                (void *)instance,
                timer_function_netif_check_timeout,
                &instance->timer_netif_check_timeout);
 
        totemknet_start_merge_detect_timeout(instance);
 
        /* Start listening for config changes */
        totemknet_add_config_notifications(instance);
 
        /* Add stats keys to icmap */
        stats_knet_add_handle();
 
        knet_log_printf (LOGSYS_LEVEL_INFO, "totemknet initialized");
        *knet_context = instance;
 
        return (0);
 
exit_error:
        log_flush_messages(instance);
        free(instance);
        return (-1);
}
 
void *totemknet_buffer_alloc (void)
{
        /* Need to have space for a message AND a struct mcast in case of encapsulated messages */
        return malloc(KNET_MAX_PACKET_SIZE + 512);
}
 
void totemknet_buffer_release (void *ptr)
{
        return free (ptr);
}
 
int totemknet_processor_count_set (
        void *knet_context,
        int processor_count)
{
        return (0);
}
 
int totemknet_recv_flush (void *knet_context)
{
        return (0);
}
 
int totemknet_send_flush (void *knet_context)
{
        return (0);
}
 
int totemknet_token_send (
        void *knet_context,
        const void *msg,
        unsigned int msg_len)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res = 0;
 
        ucast_sendmsg (instance, &instance->token_target, msg, msg_len);
 
        return (res);
}
int totemknet_mcast_flush_send (
        void *knet_context,
        const void *msg,
        unsigned int msg_len)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res = 0;
 
        mcast_sendmsg (instance, msg, msg_len, 0);
 
        return (res);
}
 
int totemknet_mcast_noflush_send (
        void *knet_context,
        const void *msg,
        unsigned int msg_len)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res = 0;
 
        mcast_sendmsg (instance, msg, msg_len, 1);
 
        return (res);
}
 
 
extern int totemknet_iface_check (void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res = 0;
 
        knet_log_printf(LOG_DEBUG, "totemknet: iface_check");
 
        return (res);
}
 
extern void totemknet_net_mtu_adjust (void *knet_context, struct totem_config *totem_config)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
 
        knet_log_printf(LOG_DEBUG, "totemknet: Returning MTU of %d", totem_config->net_mtu);
}
 
int totemknet_token_target_set (
        void *knet_context,
        unsigned int nodeid)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res = 0;
 
        instance->token_target.nodeid = nodeid;
 
        instance->totemknet_target_set_completed (instance->context);
 
        return (res);
}
 
extern int totemknet_recv_mcast_empty (
        void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        unsigned int res;
        struct sockaddr_storage system_from;
        struct msghdr msg_hdr;
        struct iovec iov_recv;
        struct pollfd ufd;
        int nfds;
        int msg_processed = 0;
 
        iov_recv.iov_base = instance->iov_buffer;
        iov_recv.iov_len = KNET_MAX_PACKET_SIZE;
 
        memset(&msg_hdr, 0, sizeof(msg_hdr));
        msg_hdr.msg_name = &system_from;
        msg_hdr.msg_namelen = sizeof (struct sockaddr_storage);
        msg_hdr.msg_iov = &iov_recv;
        msg_hdr.msg_iovlen = 1;
 
        do {
                ufd.fd = instance->knet_fd;
                ufd.events = POLLIN;
                nfds = poll (&ufd, 1, 0);
                if (nfds == 1 && ufd.revents & POLLIN) {
                        res = recvmsg (instance->knet_fd, &msg_hdr, MSG_NOSIGNAL | MSG_DONTWAIT);
                        if (res != -1) {
                                msg_processed = 1;
                        } else {
                                msg_processed = -1;
                        }
                }
        } while (nfds == 1);
 
        return (msg_processed);
}
 
int totemknet_iface_set (void *knet_context,
        const struct totem_ip_address *local_addr,
        unsigned short ip_port,
        unsigned int iface_no)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
 
        totemip_copy(&instance->my_ids[iface_no], local_addr);
 
        knet_log_printf(LOG_INFO, "Configured link number %d: local addr: %s, port=%d", iface_no, totemip_print(local_addr), ip_port);
 
        instance->ip_port[iface_no] = ip_port;
 
        return 0;
}
 
 
int totemknet_member_add (
        void *knet_context,
        const struct totem_ip_address *local,
        const struct totem_ip_address *member,
        int link_no)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int err;
        int port = instance->ip_port[link_no];
        struct sockaddr_storage remote_ss;
        struct sockaddr_storage local_ss;
        int addrlen;
        int i;
        int host_found = 0;
        knet_node_id_t host_ids[KNET_MAX_HOST];
        size_t num_host_ids;
 
        /* Only create 1 loopback link and use link 0 */
        if (member->nodeid == instance->our_nodeid) {
                if (!instance->loopback_link) {
                        link_no = 0;
                        instance->loopback_link = 1;
                } else {
                        /* Already done */
                        return 0;
                }
        }
 
        knet_log_printf (LOGSYS_LEVEL_DEBUG, "knet: member_add: " CS_PRI_NODE_ID " (%s), link=%d", member->nodeid, totemip_print(member), link_no);
        knet_log_printf (LOGSYS_LEVEL_DEBUG, "knet:      local: " CS_PRI_NODE_ID " (%s)", local->nodeid, totemip_print(local));
 
 
        /* Only add the host if it doesn't already exist in knet */
        err = knet_host_get_host_list(instance->knet_handle, host_ids, &num_host_ids);
        if (err) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_host_get_host_list");
                return -1;
        }
        for (i=0; i<num_host_ids; i++) {
                if (host_ids[i] == member->nodeid) {
                        host_found = 1;
                }
        }
 
        if (!host_found) {
                err = knet_host_add(instance->knet_handle, member->nodeid);
                if (err != 0 && errno != EEXIST) {
                        KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_host_add");
                        return -1;
                }
        } else {
                knet_log_printf (LOGSYS_LEVEL_DEBUG, "nodeid " CS_PRI_NODE_ID " already added", member->nodeid);
        }
 
 
        if (err == 0) {
                if (knet_host_set_policy(instance->knet_handle, member->nodeid, instance->link_mode)) {
                        KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_set_policy failed");
                        return -1;
                }
        }
 
        memset(&local_ss, 0, sizeof(local_ss));
        memset(&remote_ss, 0, sizeof(remote_ss));
        /* Casts to remove const */
        totemip_totemip_to_sockaddr_convert((struct totem_ip_address *)member, port, &remote_ss, &addrlen);
        totemip_totemip_to_sockaddr_convert((struct totem_ip_address *)local, port, &local_ss, &addrlen);
 
        if (member->nodeid == instance->our_nodeid) {
                knet_log_printf (LOGSYS_LEVEL_DEBUG, "knet: loopback link is %d\n", link_no);
 
                err = knet_link_set_config(instance->knet_handle, member->nodeid, link_no,
                                           KNET_TRANSPORT_LOOPBACK,
                                           &local_ss, &remote_ss, KNET_LINK_FLAG_TRAFFICHIPRIO);
        }
        else {
                err = knet_link_set_config(instance->knet_handle, member->nodeid, link_no,
                                           instance->totem_config->interfaces[link_no].knet_transport,
                                           &local_ss, &remote_ss, KNET_LINK_FLAG_TRAFFICHIPRIO);
        }
        if (err) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set_config failed");
                return -1;
        }
 
        knet_log_printf (LOGSYS_LEVEL_DEBUG, "knet: member_add: Setting link prio to %d",
                    instance->totem_config->interfaces[link_no].knet_link_priority);
 
        err = knet_link_set_priority(instance->knet_handle, member->nodeid, link_no,
                               instance->totem_config->interfaces[link_no].knet_link_priority);
        if (err) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set_priority for nodeid " CS_PRI_NODE_ID ", link %d failed", member->nodeid, link_no);
        }
 
        /*
         * Ping timeouts may be 0 here for a newly added interface (on a reload),
         * so we leave this till later, it will get done in totemknet_refresh_config.
         * For the initial startup, we are all preset and ready to go from here.
         */
        if (instance->totem_config->interfaces[link_no].knet_ping_interval != 0) {
                err = knet_link_set_ping_timers(instance->knet_handle, member->nodeid, link_no,
                                                instance->totem_config->interfaces[link_no].knet_ping_interval,
                                                instance->totem_config->interfaces[link_no].knet_ping_timeout,
                                                instance->totem_config->interfaces[link_no].knet_ping_precision);
                if (err) {
                        /* Flush logs before reporting this error so that the knet message prints before ours */
                        int saved_errno = errno;
                        log_flush_messages(instance);
                        errno = saved_errno;
                        KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set_ping_timers for nodeid " CS_PRI_NODE_ID ", link %d failed", member->nodeid, link_no);
 
                        icmap_set_string("config.reload_error_message", "Failed to set knet ping timers");
 
                        return -1;
                }
                err = knet_link_set_pong_count(instance->knet_handle, member->nodeid, link_no,
                                               instance->totem_config->interfaces[link_no].knet_pong_count);
                if (err) {
                        /* Flush logs before reporting this error so that the knet message prints before ours */
                        int saved_errno = errno;
                        log_flush_messages(instance);
                        errno = saved_errno;
                        KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set_pong_count for nodeid " CS_PRI_NODE_ID ", link %d failed", member->nodeid, link_no);
                        icmap_set_string("config.reload_error_message", "Failed to set knet pong count");
                        return -1;
                }
        }
 
        err = knet_link_set_enable(instance->knet_handle, member->nodeid, link_no, 1);
        if (err) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set_enable for nodeid " CS_PRI_NODE_ID ", link %d failed", member->nodeid, link_no);
                return -1;
        }
 
        /* register stats */
        stats_knet_add_member(member->nodeid, link_no);
        return (0);
}
 
int totemknet_member_remove (
        void *knet_context,
        const struct totem_ip_address *token_target,
        int link_no)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res;
        uint8_t link_list[KNET_MAX_LINK];
        size_t num_links;
 
        knet_log_printf (LOGSYS_LEVEL_DEBUG, "knet: member_remove: " CS_PRI_NODE_ID ", link=%d", token_target->nodeid, link_no);
 
        /* Don't remove the link with the loopback on it until we shut down */
        if (token_target->nodeid == instance->our_nodeid) {
                return 0;
        }
 
        /* Tidy stats */
        stats_knet_del_member(token_target->nodeid, link_no);
 
        /* Remove the link first */
        res = knet_link_set_enable(instance->knet_handle, token_target->nodeid, link_no, 0);
        if (res != 0) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_set enable(off) for nodeid " CS_PRI_NODE_ID ", link %d failed", token_target->nodeid, link_no);
                return res;
        }
 
        res = knet_link_clear_config(instance->knet_handle, token_target->nodeid, link_no);
        if (res != 0) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_link_clear_config for nodeid " CS_PRI_NODE_ID ", link %d failed", token_target->nodeid, link_no);
                return res;
        }
 
        /* If this is the last link, then remove the node */
        res = knet_link_get_link_list(instance->knet_handle,
                                      token_target->nodeid, link_list, &num_links);
        if (res) {
                return (0); /* not really  failure */
        }
 
        if (num_links == 0) {
                res = knet_host_remove(instance->knet_handle, token_target->nodeid);
        }
        return res;
}
 
int totemknet_member_list_rebind_ip (
        void *knet_context)
{
        return (0);
}
 
 
static int totemknet_configure_compression (
        struct totemknet_instance *instance,
        struct totem_config *totem_config)
{
        struct knet_handle_compress_cfg compress_cfg;
        int res = 0;
 
        assert(strlen(totem_config->knet_compression_model) < sizeof(compress_cfg.compress_model));
        strcpy(compress_cfg.compress_model, totem_config->knet_compression_model);
 
        compress_cfg.compress_threshold = totem_config->knet_compression_threshold;
        compress_cfg.compress_level = totem_config->knet_compression_level;
 
        res = knet_handle_compress(instance->knet_handle, &compress_cfg);
        if (res) {
                KNET_LOGSYS_PERROR(errno, LOGSYS_LEVEL_ERROR, "knet_handle_compress failed");
        }
        return res;
}
 
int totemknet_reconfigure (
        void *knet_context,
        struct totem_config *totem_config)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res = 0;
 
        (void)totemknet_configure_compression(instance, totem_config);
 
#ifdef HAVE_LIBNOZZLE
        /* Set up nozzle device(s). Return code is ignored, because inability
         * configure nozzle is not fatal problem, errors are logged and
         * there is not much else we can do */
        (void)setup_nozzle(instance);
#endif
 
        if (totem_config->crypto_changed) {
                /* Flip crypto_index */
                totem_config->crypto_index = 3-totem_config->crypto_index;
                res = totemknet_set_knet_crypto(instance);
                if (res == 0) {
                        knet_log_printf(LOG_INFO, "kronosnet crypto reconfigured on index %d: %s/%s/%s", totem_config->crypto_index,
                                        totem_config->crypto_model,
                                        totem_config->crypto_cipher_type,
                                        totem_config->crypto_hash_type);
                } else {
                        icmap_set_string("config.reload_error_message", "Failed to set knet crypto");
                }
        }
        return (res);
}
 
 
int totemknet_crypto_reconfigure_phase (
        void *knet_context,
        struct totem_config *totem_config,
        cfg_message_crypto_reconfig_phase_t phase)
{
#ifdef HAVE_KNET_CRYPTO_RECONF
        int res;
        int config_to_use;
        int config_to_clear;
        struct knet_handle_crypto_cfg crypto_cfg;
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
 
        knet_log_printf(LOGSYS_LEVEL_DEBUG, "totemknet_crypto_reconfigure_phase %d, index=%d\n", phase, totem_config->crypto_index);
 
        switch (phase) {
                case CRYPTO_RECONFIG_PHASE_ACTIVATE:
                        config_to_use = totem_config->crypto_index;
                        if (!totemknet_is_crypto_enabled(instance)) {
                                config_to_use = 0; /* we are clearing it */
                        }
 
                        /* Enable the new config on this node */
                        res = knet_handle_crypto_use_config(instance->knet_handle, config_to_use);
                        if (res == -1) {
                                knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto_use_config %d failed: %s", config_to_use, strerror(errno));
                        }
                        break;
 
                case CRYPTO_RECONFIG_PHASE_CLEANUP:
                        /*
                         * All nodes should now have the new config. clear the old one out
                         * OR disable crypto entirely if that's what the new config insists on.
                         */
                        config_to_clear = 3-totem_config->crypto_index;
                        knet_log_printf(LOGSYS_LEVEL_DEBUG, "Clearing old knet crypto config %d\n", config_to_clear);
 
                        strcpy(crypto_cfg.crypto_model, "none");
                        strcpy(crypto_cfg.crypto_cipher_type, "none");
                        strcpy(crypto_cfg.crypto_hash_type, "none");
                        res = knet_handle_crypto_set_config(instance->knet_handle, &crypto_cfg, config_to_clear);
                        if (res == -1) {
                                knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto_set_config to clear index %d failed: %s", config_to_clear, strerror(errno));
                        }
                        if (res == -2) {
                                knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto_set_config to clear index %d failed: -2", config_to_clear);
                        }
 
                        /* If crypto is enabled then disable all cleartext reception */
                        if (totemknet_is_crypto_enabled(instance)) {
                                res = knet_handle_crypto_rx_clear_traffic(instance->knet_handle, KNET_CRYPTO_RX_DISALLOW_CLEAR_TRAFFIC);
                                if (res) {
                                        knet_log_printf(LOGSYS_LEVEL_ERROR, "knet_handle_crypto_rx_clear_traffic(DISALLOW) failed %s", strerror(errno));
                                }
                        }
        }
#endif
        return 0;
}
 
void totemknet_stats_clear (
        void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
 
        (void) knet_handle_clear_stats(instance->knet_handle, KNET_CLEARSTATS_HANDLE_AND_LINK);
}
 
/* For the stats module */
int totemknet_link_get_status (
        knet_node_id_t node, uint8_t link_no,
        struct knet_link_status *status)
{
        int res;
        int ret = CS_OK;
 
        /* We are probably not using knet */
        if (!global_instance) {
                return CS_ERR_NOT_EXIST;
        }
 
        if (link_no >= INTERFACE_MAX) {
                return CS_ERR_NOT_EXIST; /* Invalid link number */
        }
 
        res = knet_link_get_status(global_instance->knet_handle, node, link_no, status, sizeof(struct knet_link_status));
        if (res) {
                switch (errno) {
                        case EINVAL:
                                ret = CS_ERR_INVALID_PARAM;
                                break;
                        case EBUSY:
                                ret = CS_ERR_BUSY;
                                break;
                        case EDEADLK:
                                ret = CS_ERR_TRY_AGAIN;
                                break;
                        default:
                                ret = CS_ERR_LIBRARY;
                                break;
                }
        }
 
        return (ret);
}
 
int totemknet_handle_get_stats (
        struct knet_handle_stats *stats)
{
        int res;
 
        /* We are probably not using knet */
        if (!global_instance) {
                return CS_ERR_NOT_EXIST;
        }
 
        res = knet_handle_get_stats(global_instance->knet_handle, stats, sizeof(struct knet_handle_stats));
        if (res != 0) {
                return (qb_to_cs_error(-errno));
        }
 
        return CS_OK;
}
 
static void timer_function_merge_detect_timeout (
        void *data)
{
        struct totemknet_instance *instance = (struct totemknet_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;
 
        totemknet_start_merge_detect_timeout(instance);
}
 
static void totemknet_start_merge_detect_timeout(
        void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
 
        qb_loop_timer_add(instance->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 totemknet_stop_merge_detect_timeout(
        void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
 
        qb_loop_timer_del(instance->poll_handle,
            instance->timer_merge_detect_timeout);
}
 
static void log_flush_messages (void *knet_context)
{
        struct pollfd pfd;
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int cont;
 
        cont = 1;
 
        while (cont) {
                pfd.fd = instance->logpipes[0];
                pfd.events = POLLIN;
                pfd.revents = 0;
 
                if ((poll(&pfd, 1, 0) > 0) &&
                    (pfd.revents & POLLIN) &&
                    (log_deliver_fn(instance->logpipes[0], POLLIN, instance) == 0)) {
                        cont = 1;
                } else {
                        cont = 0;
                }
        }
}
 
 
#ifdef HAVE_LIBNOZZLE
#define NOZZLE_NAME    "nozzle.name"
#define NOZZLE_IPADDR  "nozzle.ipaddr"
#define NOZZLE_PREFIX  "nozzle.ipprefix"
#define NOZZLE_MACADDR "nozzle.macaddr"
 
#define NOZZLE_CHANNEL 1
 
 
static char *get_nozzle_script_dir(void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        char filename[PATH_MAX + FILENAME_MAX + 1];
        static char updown_dirname[PATH_MAX + FILENAME_MAX + 1];
        int res;
        const char *dirname_res;
 
        /*
         * Build script directory based on corosync.conf file location
         */
        res = snprintf(filename, sizeof(filename), "%s",
            corosync_get_config_file());
        if (res >= sizeof(filename)) {
                knet_log_printf (LOGSYS_LEVEL_DEBUG, "nozzle up/down path too long");
                return NULL;
        }
 
        dirname_res = dirname(filename);
 
        res = snprintf(updown_dirname, sizeof(updown_dirname), "%s/%s",
            dirname_res, "updown.d");
        if (res >= sizeof(updown_dirname)) {
                knet_log_printf (LOGSYS_LEVEL_DEBUG, "nozzle up/down path too long");
                return NULL;
        }
        return updown_dirname;
}
 
/*
 * Deliberately doesn't return the status as caller doesn't care.
 * The result will be logged though
 */
static void run_nozzle_script(struct totemknet_instance *instance, int type, const char *typename)
{
        int res;
        char *exec_string;
 
        res = nozzle_run_updown(instance->nozzle_handle, type, &exec_string);
        if (res == -1 && errno != ENOENT) {
                knet_log_printf (LOGSYS_LEVEL_INFO, "exec nozzle %s script failed: %s", typename, strerror(errno));
        } else if (res == -2) {
                knet_log_printf (LOGSYS_LEVEL_INFO, "nozzle %s script failed", typename);
                knet_log_printf (LOGSYS_LEVEL_INFO, "%s", exec_string);
        }
}
 
/*
 * Reparse IP address to add in our node ID
 * IPv6 addresses must end in '::'
 * IPv4 addresses must just be valid
 * '/xx' lengths are optional for IPv6, mandatory for IPv4
 *
 * Returns the modified IP address as a string to pass into libnozzle
 */
static int reparse_nozzle_ip_address(struct totemknet_instance *instance,
                                     const char *input_addr,
                                     const char *prefix, int nodeid,
                                     char *output_addr, size_t output_len)
{
        const char *coloncolon;
        int bits;
        int max_prefix = 64;
        uint32_t nodeid_mask;
        uint32_t addr_mask;
        uint32_t masked_nodeid;
        struct in_addr *addr;
        struct totem_ip_address totemip;
 
        coloncolon = strstr(input_addr, "::");
        if (!coloncolon) {
                max_prefix = 30;
        }
 
        bits = atoi(prefix);
        if (bits < 8 || bits > max_prefix) {
                knet_log_printf(LOGSYS_LEVEL_ERROR, "nozzle IP address prefix must be >= 8 and <= %d (got %d)", max_prefix, bits);
                return -1;
        }
 
        /* IPv6 is easy */
        if (coloncolon) {
                memcpy(output_addr, input_addr, coloncolon-input_addr);
                sprintf(output_addr + (coloncolon-input_addr), "::%x", nodeid);
                return 0;
        }
 
        /* For IPv4 we need to parse the address into binary, mask off the required bits,
         * add in the masked_nodeid and 'print' it out again
         */
        nodeid_mask = UINT32_MAX & ((1<<(32 - bits)) - 1);
        addr_mask   = UINT32_MAX ^ nodeid_mask;
        masked_nodeid = nodeid & nodeid_mask;
 
        if (totemip_parse(&totemip, input_addr, AF_INET)) {
                knet_log_printf(LOGSYS_LEVEL_ERROR, "Failed to parse IPv4 nozzle IP address");
                return -1;
        }
        addr = (struct in_addr *)&totemip.addr;
        addr->s_addr &= htonl(addr_mask);
        addr->s_addr |= htonl(masked_nodeid);
 
        inet_ntop(AF_INET, addr, output_addr, output_len);
        return 0;
}
 
static int create_nozzle_device(void *knet_context, const char *name,
                                const char *ipaddr, const char *prefix,
                                const char *macaddr)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        char device_name[IFNAMSIZ+1];
        size_t size = IFNAMSIZ;
        int8_t channel = NOZZLE_CHANNEL;
        nozzle_t nozzle_dev;
        int nozzle_fd;
        int res;
        char *updown_dir;
        char parsed_ipaddr[INET6_ADDRSTRLEN];
        char mac[19];
 
        memset(device_name, 0, size);
        memset(&mac, 0, sizeof(mac));
        strncpy(device_name, name, size);
 
        updown_dir = get_nozzle_script_dir(knet_context);
        knet_log_printf (LOGSYS_LEVEL_INFO, "nozzle script dir is %s", updown_dir);
 
        nozzle_dev = nozzle_open(device_name, size, updown_dir);
        if (!nozzle_dev) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Unable to init nozzle device %s: %s", device_name, strerror(errno));
                return -1;
        }
        instance->nozzle_handle = nozzle_dev;
 
        if (nozzle_set_mac(nozzle_dev, macaddr) < 0) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Unable to add set nozzle MAC to %s: %s", mac, strerror(errno));
                goto out_clean;
        }
 
        if (reparse_nozzle_ip_address(instance, ipaddr, prefix, instance->our_nodeid, parsed_ipaddr, sizeof(parsed_ipaddr))) {
                /* Prints its own errors */
                goto out_clean;
        }
        knet_log_printf (LOGSYS_LEVEL_INFO, "Local nozzle IP address is %s / %d", parsed_ipaddr, atoi(prefix));
        if (nozzle_add_ip(nozzle_dev, parsed_ipaddr, prefix) < 0) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Unable to add set nozzle IP addr to %s/%s: %s", parsed_ipaddr, prefix, strerror(errno));
                goto out_clean;
        }
 
        nozzle_fd = nozzle_get_fd(nozzle_dev);
        knet_log_printf (LOGSYS_LEVEL_INFO, "Opened '%s' on fd %d", device_name, nozzle_fd);
 
#ifdef KNET_DATAFD_FLAG_RX_RETURN_INFO
        res = knet_handle_add_datafd(instance->knet_handle, &nozzle_fd, &channel, 0);
#else
        res = knet_handle_add_datafd(instance->knet_handle, &nozzle_fd, &channel);
#endif
        if (res != 0) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Unable to add nozzle FD to knet: %s", strerror(errno));
                goto out_clean;
        }
 
        run_nozzle_script(instance, NOZZLE_PREUP, "pre-up");
 
        res = nozzle_set_up(nozzle_dev);
        if (res != 0) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Unable to set nozzle interface UP: %s", strerror(errno));
                goto out_clean;
        }
        run_nozzle_script(instance, NOZZLE_UP, "up");
 
        return 0;
 
out_clean:
        nozzle_close(nozzle_dev);
        return -1;
}
 
static int remove_nozzle_device(void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        int res;
        int datafd;
 
        res = knet_handle_get_datafd(instance->knet_handle, NOZZLE_CHANNEL, &datafd);
        if (res != 0) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Can't find datafd for channel %d: %s", NOZZLE_CHANNEL, strerror(errno));
                return -1;
        }
 
        res = knet_handle_remove_datafd(instance->knet_handle, datafd);
        if (res != 0) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Can't remove datafd for nozzle channel %d: %s", NOZZLE_CHANNEL, strerror(errno));
                return -1;
        }
 
        run_nozzle_script(instance, NOZZLE_DOWN, "pre-down");
        res = nozzle_set_down(instance->nozzle_handle);
        if (res != 0) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Can't set nozzle device down: %s", strerror(errno));
                return -1;
        }
        run_nozzle_script(instance, NOZZLE_POSTDOWN, "post-down");
 
        res = nozzle_close(instance->nozzle_handle);
        if (res != 0) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "Can't close nozzle device: %s", strerror(errno));
                return -1;
        }
        knet_log_printf (LOGSYS_LEVEL_INFO, "Removed nozzle device");
        return 0;
}
 
static void free_nozzle(struct totemknet_instance *instance)
{
        free(instance->nozzle_name);
        free(instance->nozzle_ipaddr);
        free(instance->nozzle_prefix);
        free(instance->nozzle_macaddr);
 
        instance->nozzle_name =      instance->nozzle_ipaddr = instance->nozzle_prefix =
                instance->nozzle_macaddr = NULL;
}
 
static int setup_nozzle(void *knet_context)
{
        struct totemknet_instance *instance = (struct totemknet_instance *)knet_context;
        char *ipaddr_str = NULL;
        char *name_str = NULL;
        char *prefix_str = NULL;
        char *macaddr_str = NULL;
        char mac[32];
        int name_res;
        int macaddr_res;
        int res = -1;
 
        /*
         * Return value ignored on purpose. icmap_get_string changes
         * ipaddr_str/prefix_str only on success.
         */
        (void)icmap_get_string(NOZZLE_IPADDR, &ipaddr_str);
        (void)icmap_get_string(NOZZLE_PREFIX, &prefix_str);
        macaddr_res = icmap_get_string(NOZZLE_MACADDR, &macaddr_str);
        name_res = icmap_get_string(NOZZLE_NAME, &name_str);
 
        /* Is is being removed? */
        if (name_res == CS_ERR_NOT_EXIST && instance->nozzle_handle) {
                remove_nozzle_device(instance);
                free_nozzle(instance);
                goto out_free;
        }
 
        if (!name_str) {
                /* no nozzle */
                goto out_free;
        }
 
        if (!ipaddr_str) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "No IP address supplied for Nozzle device");
                goto out_free;
        }
 
        if (!prefix_str) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "No prefix supplied for Nozzle IP address");
                goto out_free;
        }
 
        if (macaddr_str && strlen(macaddr_str) != 17) {
                knet_log_printf (LOGSYS_LEVEL_ERROR, "macaddr for nozzle device is not in the correct format '%s'", macaddr_str);
                goto out_free;
        }
        if (!macaddr_str) {
                macaddr_str = (char*)"54:54:01:00:00:00";
        }
 
        if (instance->nozzle_name &&
            (strcmp(name_str, instance->nozzle_name) == 0) &&
            (strcmp(ipaddr_str, instance->nozzle_ipaddr) == 0) &&
            (strcmp(prefix_str, instance->nozzle_prefix) == 0) &&
            (instance->nozzle_macaddr == NULL ||
             strcmp(macaddr_str, instance->nozzle_macaddr) == 0)) {
                /* Nothing has changed */
                knet_log_printf (LOGSYS_LEVEL_DEBUG, "Nozzle device info not changed");
                goto out_free;
        }
 
        /* Add nodeid into MAC address */
        memcpy(mac, macaddr_str, 12);
        snprintf(mac+12, sizeof(mac) - 13, "%02x:%02x",
                 instance->our_nodeid >> 8,
                 instance->our_nodeid & 0xFF);
        knet_log_printf (LOGSYS_LEVEL_INFO, "Local nozzle MAC address is %s", mac);
 
        if (name_res == CS_OK && name_str) {
                /* Reconfigure */
                if (instance->nozzle_name) {
                        remove_nozzle_device(instance);
                        free_nozzle(instance);
                }
 
                res = create_nozzle_device(knet_context, name_str, ipaddr_str, prefix_str,
                                           mac);
 
                instance->nozzle_name = strdup(name_str);
                instance->nozzle_ipaddr = strdup(ipaddr_str);
                instance->nozzle_prefix = strdup(prefix_str);
                instance->nozzle_macaddr = strdup(macaddr_str);
                if (!instance->nozzle_name || !instance->nozzle_ipaddr ||
                    !instance->nozzle_prefix) {
                        knet_log_printf (LOGSYS_LEVEL_ERROR, "strdup failed in nozzle allocation");
                        /*
                         * This 'free' will cause a complete reconfigure of the device next time we reload
                         * but will also let the the current device keep working until then.
                         * remove_nozzle() only needs the, statically-allocated, nozzle_handle
                         */
                        free_nozzle(instance);
                }
        }
 
out_free:
        free(name_str);
        free(ipaddr_str);
        free(prefix_str);
        if (macaddr_res == CS_OK) {
                free(macaddr_str);
        }
 
        return res;
}
#endif // HAVE_LIBNOZZLE