Adding upstream version 1.37.1.upstream/1.37.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 948 insertions, 0 deletions

diff --git a/collectors/nfacct.plugin/Makefile.am b/collectors/nfacct.plugin/Makefile.am
new file mode 100644
index 0000000..161784b
--- /dev/null
+++ b/collectors/nfacct.plugin/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+    README.md \
+    $(NULL)
diff --git a/collectors/nfacct.plugin/README.md b/collectors/nfacct.plugin/README.md
new file mode 100644
index 0000000..bacc8b7
--- /dev/null
+++ b/collectors/nfacct.plugin/README.md
@@ -0,0 +1,54 @@
+<!--
+title: "nfacct.plugin"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/collectors/nfacct.plugin/README.md
+-->
+
+# nfacct.plugin
+
+`nfacct.plugin` collects Netfilter statistics.
+
+## Prerequisites
+
+1.  install `libmnl-dev` and `libnetfilter-acct-dev` using the package manager of your system.
+
+2.  re-install Netdata from source. The installer will detect that the required libraries are now available and will also build `netdata.plugin`.
+
+Keep in mind that NFACCT requires root access, so the plugin is setuid to root.
+
+## Charts
+
+The plugin provides Netfilter connection tracker statistics and nfacct packet and bandwidth accounting:
+
+Connection tracker:
+
+1.  Connections.
+2.  Changes.
+3.  Expectations.
+4.  Errors.
+5.  Searches.
+
+Netfilter accounting:
+
+1.  Packets.
+2.  Bandwidth.
+
+## Configuration
+
+If you need to disable NFACCT for Netdata, edit /etc/netdata/netdata.conf and set:
+
+```
+[plugins]
+    nfacct = no
+```
+
+## Debugging
+
+You can run the plugin by hand:
+
+```
+sudo /usr/libexec/netdata/plugins.d/nfacct.plugin 1 debug
+```
+
+You will get verbose output on what the plugin does.
+
+
diff --git a/collectors/nfacct.plugin/plugin_nfacct.c b/collectors/nfacct.plugin/plugin_nfacct.c
new file mode 100644
index 0000000..eeadb3c
--- /dev/null
+++ b/collectors/nfacct.plugin/plugin_nfacct.c
@@ -0,0 +1,886 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "libnetdata/libnetdata.h"
+#include "libnetdata/required_dummies.h"
+
+#include <linux/netfilter/nfnetlink_conntrack.h>
+#include <libmnl/libmnl.h>
+#include <libnetfilter_acct/libnetfilter_acct.h>
+
+#define PLUGIN_NFACCT_NAME "nfacct.plugin"
+
+#define NETDATA_CHART_PRIO_NETFILTER_NEW              8701
+#define NETDATA_CHART_PRIO_NETFILTER_CHANGES          8702
+#define NETDATA_CHART_PRIO_NETFILTER_EXPECT           8703
+#define NETDATA_CHART_PRIO_NETFILTER_ERRORS           8705
+#define NETDATA_CHART_PRIO_NETFILTER_SEARCH           8710
+
+#define NETDATA_CHART_PRIO_NETFILTER_PACKETS          8906
+#define NETDATA_CHART_PRIO_NETFILTER_BYTES            8907
+
+static inline size_t mnl_buffer_size() {
+    long s = MNL_SOCKET_BUFFER_SIZE;
+    if(s <= 0) return 8192;
+    return (size_t)s;
+}
+
+// variables
+static int debug = 0;
+static int netdata_update_every = 1;
+
+#define RRD_TYPE_NET_STAT_NETFILTER "netfilter"
+#define RRD_TYPE_NET_STAT_CONNTRACK "netlink"
+
+static struct {
+    int update_every;
+    char *buf;
+    size_t buf_size;
+    struct mnl_socket *mnl;
+    struct nlmsghdr *nlh;
+    struct nfgenmsg *nfh;
+    unsigned int seq;
+    uint32_t portid;
+
+    struct nlattr *tb[CTA_STATS_MAX+1];
+    const char *attr2name[CTA_STATS_MAX+1];
+    kernel_uint_t metrics[CTA_STATS_MAX+1];
+
+    struct nlattr *tb_exp[CTA_STATS_EXP_MAX+1];
+    const char *attr2name_exp[CTA_STATS_EXP_MAX+1];
+    kernel_uint_t metrics_exp[CTA_STATS_EXP_MAX+1];
+} nfstat_root = {
+        .update_every = 1,
+        .buf = NULL,
+        .buf_size = 0,
+        .mnl = NULL,
+        .nlh = NULL,
+        .nfh = NULL,
+        .seq = 0,
+        .portid = 0,
+        .tb = {},
+        .attr2name = {
+                [CTA_STATS_SEARCHED]	   = "searched",
+                [CTA_STATS_FOUND]	       = "found",
+                [CTA_STATS_NEW]		       = "new",
+                [CTA_STATS_INVALID]	       = "invalid",
+                [CTA_STATS_IGNORE]	       = "ignore",
+                [CTA_STATS_DELETE]	       = "delete",
+                [CTA_STATS_DELETE_LIST]	   = "delete_list",
+                [CTA_STATS_INSERT]	       = "insert",
+                [CTA_STATS_INSERT_FAILED]  = "insert_failed",
+                [CTA_STATS_DROP]	       = "drop",
+                [CTA_STATS_EARLY_DROP]	   = "early_drop",
+                [CTA_STATS_ERROR]	       = "icmp_error",
+                [CTA_STATS_SEARCH_RESTART] = "search_restart",
+        },
+        .metrics = {},
+        .tb_exp = {},
+        .attr2name_exp = {
+                [CTA_STATS_EXP_NEW]	       = "new",
+                [CTA_STATS_EXP_CREATE]	   = "created",
+                [CTA_STATS_EXP_DELETE]	   = "deleted",
+        },
+        .metrics_exp = {}
+};
+
+
+static int nfstat_init(int update_every) {
+    nfstat_root.update_every = update_every;
+
+    nfstat_root.buf_size = mnl_buffer_size();
+    nfstat_root.buf = mallocz(nfstat_root.buf_size);
+
+    nfstat_root.mnl  = mnl_socket_open(NETLINK_NETFILTER);
+    if(!nfstat_root.mnl) {
+        error("NFSTAT: mnl_socket_open() failed");
+        return 1;
+    }
+
+    nfstat_root.seq = (unsigned int)now_realtime_sec() - 1;
+
+    if(mnl_socket_bind(nfstat_root.mnl, 0, MNL_SOCKET_AUTOPID) < 0) {
+        error("NFSTAT: mnl_socket_bind() failed");
+        return 1;
+    }
+    nfstat_root.portid = mnl_socket_get_portid(nfstat_root.mnl);
+
+    return 0;
+}
+
+static struct nlmsghdr * nfct_mnl_nlmsghdr_put(char *buf, uint16_t subsys, uint16_t type, uint8_t family, uint32_t seq) {
+    struct nlmsghdr *nlh;
+    struct nfgenmsg *nfh;
+
+    nlh = mnl_nlmsg_put_header(buf);
+    nlh->nlmsg_type = (subsys << 8) | type;
+    nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP;
+    nlh->nlmsg_seq = seq;
+
+    nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg));
+    nfh->nfgen_family = family;
+    nfh->version = NFNETLINK_V0;
+    nfh->res_id = 0;
+
+    return nlh;
+}
+
+static int nfct_stats_attr_cb(const struct nlattr *attr, void *data) {
+    const struct nlattr **tb = data;
+    int type = mnl_attr_get_type(attr);
+
+    if (mnl_attr_type_valid(attr, CTA_STATS_MAX) < 0)
+        return MNL_CB_OK;
+
+    if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+        error("NFSTAT: mnl_attr_validate() failed");
+        return MNL_CB_ERROR;
+    }
+
+    tb[type] = attr;
+    return MNL_CB_OK;
+}
+
+static int nfstat_callback(const struct nlmsghdr *nlh, void *data) {
+    (void)data;
+
+    struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
+
+    mnl_attr_parse(nlh, sizeof(*nfg), nfct_stats_attr_cb, nfstat_root.tb);
+
+    // printf("cpu=%-4u\t", ntohs(nfg->res_id));
+
+    int i;
+    // add the metrics of this CPU into the metrics
+    for (i = 0; i < CTA_STATS_MAX+1; i++) {
+        if (nfstat_root.tb[i]) {
+            // printf("%s=%u ", nfstat_root.attr2name[i], ntohl(mnl_attr_get_u32(nfstat_root.tb[i])));
+            nfstat_root.metrics[i] += ntohl(mnl_attr_get_u32(nfstat_root.tb[i]));
+        }
+    }
+    // printf("\n");
+
+    return MNL_CB_OK;
+}
+
+static int nfstat_collect_conntrack() {
+    // zero all metrics - we will sum the metrics of all CPUs later
+    int i;
+    for (i = 0; i < CTA_STATS_MAX+1; i++)
+        nfstat_root.metrics[i] = 0;
+
+    // prepare the request
+    nfstat_root.nlh = nfct_mnl_nlmsghdr_put(nfstat_root.buf, NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS_CPU, AF_UNSPEC, nfstat_root.seq);
+
+    // send the request
+    if(mnl_socket_sendto(nfstat_root.mnl, nfstat_root.nlh, nfstat_root.nlh->nlmsg_len) < 0) {
+        error("NFSTAT: mnl_socket_sendto() failed");
+        return 1;
+    }
+
+    // get the reply
+    ssize_t ret;
+    while ((ret = mnl_socket_recvfrom(nfstat_root.mnl, nfstat_root.buf, nfstat_root.buf_size)) > 0) {
+        if(mnl_cb_run(
+                nfstat_root.buf
+                , (size_t)ret
+                , nfstat_root.nlh->nlmsg_seq
+                , nfstat_root.portid
+                , nfstat_callback
+                , NULL
+        ) <= MNL_CB_STOP)
+            break;
+    }
+
+    // verify we run without issues
+    if (ret == -1) {
+        error("NFSTAT: error communicating with kernel. This plugin can only work when netdata runs as root.");
+        return 1;
+    }
+
+    return 0;
+}
+
+static int nfexp_stats_attr_cb(const struct nlattr *attr, void *data)
+{
+    const struct nlattr **tb = data;
+    int type = mnl_attr_get_type(attr);
+
+    if (mnl_attr_type_valid(attr, CTA_STATS_EXP_MAX) < 0)
+        return MNL_CB_OK;
+
+    if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+        error("NFSTAT EXP: mnl_attr_validate() failed");
+        return MNL_CB_ERROR;
+    }
+
+    tb[type] = attr;
+    return MNL_CB_OK;
+}
+
+static int nfstat_callback_exp(const struct nlmsghdr *nlh, void *data) {
+    (void)data;
+
+    struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
+
+    mnl_attr_parse(nlh, sizeof(*nfg), nfexp_stats_attr_cb, nfstat_root.tb_exp);
+
+    int i;
+    for (i = 0; i < CTA_STATS_EXP_MAX+1; i++) {
+        if (nfstat_root.tb_exp[i]) {
+            nfstat_root.metrics_exp[i] += ntohl(mnl_attr_get_u32(nfstat_root.tb_exp[i]));
+        }
+    }
+
+    return MNL_CB_OK;
+}
+
+static int nfstat_collect_conntrack_expectations() {
+    // zero all metrics - we will sum the metrics of all CPUs later
+    int i;
+    for (i = 0; i < CTA_STATS_EXP_MAX+1; i++)
+        nfstat_root.metrics_exp[i] = 0;
+
+    // prepare the request
+    nfstat_root.nlh = nfct_mnl_nlmsghdr_put(nfstat_root.buf, NFNL_SUBSYS_CTNETLINK_EXP, IPCTNL_MSG_EXP_GET_STATS_CPU, AF_UNSPEC, nfstat_root.seq);
+
+    // send the request
+    if(mnl_socket_sendto(nfstat_root.mnl, nfstat_root.nlh, nfstat_root.nlh->nlmsg_len) < 0) {
+        error("NFSTAT: mnl_socket_sendto() failed");
+        return 1;
+    }
+
+    // get the reply
+    ssize_t ret;
+    while ((ret = mnl_socket_recvfrom(nfstat_root.mnl, nfstat_root.buf, nfstat_root.buf_size)) > 0) {
+        if(mnl_cb_run(
+                nfstat_root.buf
+                , (size_t)ret
+                , nfstat_root.nlh->nlmsg_seq
+                , nfstat_root.portid
+                , nfstat_callback_exp
+                , NULL
+        ) <= MNL_CB_STOP)
+            break;
+    }
+
+    // verify we run without issues
+    if (ret == -1) {
+        error("NFSTAT: error communicating with kernel. This plugin can only work when netdata runs as root.");
+        return 1;
+    }
+
+    return 0;
+}
+
+static int nfstat_collect() {
+    nfstat_root.seq++;
+
+    if(nfstat_collect_conntrack())
+        return 1;
+
+    if(nfstat_collect_conntrack_expectations())
+        return 1;
+
+    return 0;
+}
+
+static void nfstat_send_metrics() {
+    static int new_chart_generated = 0, changes_chart_generated = 0, search_chart_generated = 0, errors_chart_generated = 0, expect_chart_generated = 0;
+
+    if(!new_chart_generated) {
+        new_chart_generated = 1;
+
+        printf("CHART %s.%s '' 'Connection Tracker New Connections' 'connections/s' %s '' line %d %d %s\n"
+               , RRD_TYPE_NET_STAT_NETFILTER
+               , RRD_TYPE_NET_STAT_CONNTRACK "_new"
+               , RRD_TYPE_NET_STAT_CONNTRACK
+               , NETDATA_CHART_PRIO_NETFILTER_NEW
+               , nfstat_root.update_every
+               , PLUGIN_NFACCT_NAME
+        );
+        printf("DIMENSION %s '' incremental 1 1\n", nfstat_root.attr2name[CTA_STATS_NEW]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_IGNORE]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_INVALID]);
+    }
+
+    printf(
+           "BEGIN %s.%s\n"
+           , RRD_TYPE_NET_STAT_NETFILTER
+           , RRD_TYPE_NET_STAT_CONNTRACK "_new"
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_NEW]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_NEW]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_IGNORE]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_IGNORE]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_INVALID]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_INVALID]
+    );
+    printf("END\n");
+
+    // ----------------------------------------------------------------
+
+    if(!changes_chart_generated) {
+        changes_chart_generated = 1;
+
+        printf("CHART %s.%s '' 'Connection Tracker Changes' 'changes/s' %s '' line %d %d detail %s\n"
+               , RRD_TYPE_NET_STAT_NETFILTER
+               , RRD_TYPE_NET_STAT_CONNTRACK "_changes"
+               , RRD_TYPE_NET_STAT_CONNTRACK
+               , NETDATA_CHART_PRIO_NETFILTER_CHANGES
+               , nfstat_root.update_every
+               , PLUGIN_NFACCT_NAME
+        );
+        printf("DIMENSION %s '' incremental  1 1\n", nfstat_root.attr2name[CTA_STATS_INSERT]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_DELETE]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_DELETE_LIST]);
+    }
+
+    printf(
+           "BEGIN %s.%s\n"
+           , RRD_TYPE_NET_STAT_NETFILTER
+           , RRD_TYPE_NET_STAT_CONNTRACK "_changes"
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_INSERT]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_INSERT]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_DELETE]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_DELETE]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_DELETE_LIST]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_DELETE_LIST]
+    );
+    printf("END\n");
+
+    // ----------------------------------------------------------------
+
+    if(!search_chart_generated) {
+        search_chart_generated = 1;
+
+        printf("CHART %s.%s '' 'Connection Tracker Searches' 'searches/s' %s '' line %d %d detail %s\n"
+               , RRD_TYPE_NET_STAT_NETFILTER
+               , RRD_TYPE_NET_STAT_CONNTRACK "_search"
+               , RRD_TYPE_NET_STAT_CONNTRACK
+               , NETDATA_CHART_PRIO_NETFILTER_SEARCH
+               , nfstat_root.update_every
+               , PLUGIN_NFACCT_NAME
+        );
+        printf("DIMENSION %s '' incremental  1 1\n", nfstat_root.attr2name[CTA_STATS_SEARCHED]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_SEARCH_RESTART]);
+        printf("DIMENSION %s '' incremental  1 1\n", nfstat_root.attr2name[CTA_STATS_FOUND]);
+    }
+
+    printf(
+           "BEGIN %s.%s\n"
+           , RRD_TYPE_NET_STAT_NETFILTER
+           , RRD_TYPE_NET_STAT_CONNTRACK "_search"
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_SEARCHED]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_SEARCHED]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_SEARCH_RESTART]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_SEARCH_RESTART]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_FOUND]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_FOUND]
+    );
+    printf("END\n");
+
+    // ----------------------------------------------------------------
+
+    if(!errors_chart_generated) {
+        errors_chart_generated = 1;
+
+        printf("CHART %s.%s '' 'Connection Tracker Errors' 'events/s' %s '' line %d %d detail %s\n"
+               , RRD_TYPE_NET_STAT_NETFILTER
+               , RRD_TYPE_NET_STAT_CONNTRACK "_errors"
+               , RRD_TYPE_NET_STAT_CONNTRACK
+               , NETDATA_CHART_PRIO_NETFILTER_ERRORS
+               , nfstat_root.update_every
+               , PLUGIN_NFACCT_NAME
+        );
+        printf("DIMENSION %s '' incremental  1 1\n", nfstat_root.attr2name[CTA_STATS_ERROR]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_INSERT_FAILED]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_DROP]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_EARLY_DROP]);
+    }
+
+    printf(
+           "BEGIN %s.%s\n"
+           , RRD_TYPE_NET_STAT_NETFILTER
+           , RRD_TYPE_NET_STAT_CONNTRACK "_errors"
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_ERROR]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_ERROR]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_INSERT_FAILED]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_INSERT_FAILED]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_DROP]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_DROP]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_EARLY_DROP]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_EARLY_DROP]
+    );
+    printf("END\n");
+
+    // ----------------------------------------------------------------
+
+    if(!expect_chart_generated) {
+        expect_chart_generated = 1;
+
+        printf("CHART %s.%s '' 'Connection Tracker Expectations' 'expectations/s' %s '' line %d %d detail %s\n"
+               , RRD_TYPE_NET_STAT_NETFILTER
+               , RRD_TYPE_NET_STAT_CONNTRACK "_expect"
+               , RRD_TYPE_NET_STAT_CONNTRACK
+               , NETDATA_CHART_PRIO_NETFILTER_EXPECT
+               , nfstat_root.update_every
+               , PLUGIN_NFACCT_NAME
+        );
+        printf("DIMENSION %s '' incremental  1 1\n", nfstat_root.attr2name[CTA_STATS_EXP_CREATE]);
+        printf("DIMENSION %s '' incremental -1 1\n", nfstat_root.attr2name[CTA_STATS_EXP_DELETE]);
+        printf("DIMENSION %s '' incremental  1 1\n", nfstat_root.attr2name[CTA_STATS_EXP_NEW]);
+    }
+
+    printf(
+           "BEGIN %s.%s\n"
+           , RRD_TYPE_NET_STAT_NETFILTER
+           , RRD_TYPE_NET_STAT_CONNTRACK "_expect"
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_EXP_CREATE]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_EXP_CREATE]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_EXP_DELETE]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_EXP_DELETE]
+    );
+    printf(
+           "SET %s = %lld\n"
+           , nfstat_root.attr2name[CTA_STATS_EXP_NEW]
+           , (collected_number) nfstat_root.metrics[CTA_STATS_EXP_NEW]
+    );
+    printf("END\n");
+}
+
+
+struct nfacct_data {
+    char *name;
+    uint32_t hash;
+
+    uint64_t pkts;
+    uint64_t bytes;
+
+    int packets_dimension_added;
+    int bytes_dimension_added;
+
+    int updated;
+
+    struct nfacct_data *next;
+};
+
+static struct {
+    int update_every;
+    char *buf;
+    size_t buf_size;
+    struct mnl_socket *mnl;
+    struct nlmsghdr *nlh;
+    unsigned int seq;
+    uint32_t portid;
+    struct nfacct *nfacct_buffer;
+    struct nfacct_data *nfacct_metrics;
+} nfacct_root = {
+        .update_every = 1,
+        .buf = NULL,
+        .buf_size = 0,
+        .mnl = NULL,
+        .nlh = NULL,
+        .seq = 0,
+        .portid = 0,
+        .nfacct_buffer = NULL,
+        .nfacct_metrics = NULL
+};
+
+static inline struct nfacct_data *nfacct_data_get(const char *name, uint32_t hash) {
+    struct nfacct_data *d = NULL, *last = NULL;
+    for(d = nfacct_root.nfacct_metrics; d ; last = d, d = d->next) {
+        if(unlikely(d->hash == hash && !strcmp(d->name, name)))
+            return d;
+    }
+
+    d = callocz(1, sizeof(struct nfacct_data));
+    d->name = strdupz(name);
+    d->hash = hash;
+
+    if(!last) {
+        d->next = nfacct_root.nfacct_metrics;
+        nfacct_root.nfacct_metrics = d;
+    }
+    else {
+        d->next = last->next;
+        last->next = d;
+    }
+
+    return d;
+}
+
+static int nfacct_init(int update_every) {
+    nfacct_root.update_every = update_every;
+
+    nfacct_root.buf_size = mnl_buffer_size();
+    nfacct_root.buf = mallocz(nfacct_root.buf_size);
+
+    nfacct_root.nfacct_buffer = nfacct_alloc();
+    if(!nfacct_root.nfacct_buffer) {
+        error("nfacct.plugin: nfacct_alloc() failed.");
+        return 0;
+    }
+
+    nfacct_root.seq = (unsigned int)now_realtime_sec() - 1;
+
+    nfacct_root.mnl  = mnl_socket_open(NETLINK_NETFILTER);
+    if(!nfacct_root.mnl) {
+        error("nfacct.plugin: mnl_socket_open() failed");
+        return 1;
+    }
+
+    if(mnl_socket_bind(nfacct_root.mnl, 0, MNL_SOCKET_AUTOPID) < 0) {
+        error("nfacct.plugin: mnl_socket_bind() failed");
+        return 1;
+    }
+    nfacct_root.portid = mnl_socket_get_portid(nfacct_root.mnl);
+
+    return 0;
+}
+
+static int nfacct_callback(const struct nlmsghdr *nlh, void *data) {
+    (void)data;
+
+    if(nfacct_nlmsg_parse_payload(nlh, nfacct_root.nfacct_buffer) < 0) {
+        error("NFACCT: nfacct_nlmsg_parse_payload() failed.");
+        return MNL_CB_OK;
+    }
+
+    const char *name = nfacct_attr_get_str(nfacct_root.nfacct_buffer, NFACCT_ATTR_NAME);
+    uint32_t hash = simple_hash(name);
+
+    struct nfacct_data *d = nfacct_data_get(name, hash);
+
+    d->pkts  = nfacct_attr_get_u64(nfacct_root.nfacct_buffer, NFACCT_ATTR_PKTS);
+    d->bytes = nfacct_attr_get_u64(nfacct_root.nfacct_buffer, NFACCT_ATTR_BYTES);
+    d->updated = 1;
+
+    return MNL_CB_OK;
+}
+
+static int nfacct_collect() {
+    // mark all old metrics as not-updated
+    struct nfacct_data *d;
+    for(d = nfacct_root.nfacct_metrics; d ; d = d->next)
+        d->updated = 0;
+
+    // prepare the request
+    nfacct_root.seq++;
+    nfacct_root.nlh = nfacct_nlmsg_build_hdr(nfacct_root.buf, NFNL_MSG_ACCT_GET, NLM_F_DUMP, (uint32_t)nfacct_root.seq);
+    if(!nfacct_root.nlh) {
+        error("NFACCT: nfacct_nlmsg_build_hdr() failed");
+        return 1;
+    }
+
+    // send the request
+    if(mnl_socket_sendto(nfacct_root.mnl, nfacct_root.nlh, nfacct_root.nlh->nlmsg_len) < 0) {
+        error("NFACCT: mnl_socket_sendto() failed");
+        return 1;
+    }
+
+    // get the reply
+    ssize_t ret;
+    while((ret = mnl_socket_recvfrom(nfacct_root.mnl, nfacct_root.buf, nfacct_root.buf_size)) > 0) {
+        if(mnl_cb_run(
+                nfacct_root.buf
+                , (size_t)ret
+                , nfacct_root.seq
+                , nfacct_root.portid
+                , nfacct_callback
+                , NULL
+        ) <= 0)
+            break;
+    }
+
+    // verify we run without issues
+    if (ret == -1) {
+        error("NFACCT: error communicating with kernel. This plugin can only work when netdata runs as root.");
+        return 1;
+    }
+
+    return 0;
+}
+
+static void nfacct_send_metrics() {
+    static int bytes_chart_generated = 0, packets_chart_generated = 0;
+
+    if(!nfacct_root.nfacct_metrics) return;
+    struct nfacct_data *d;
+
+    if(!packets_chart_generated) {
+        packets_chart_generated = 1;
+        printf("CHART netfilter.nfacct_packets '' 'Netfilter Accounting Packets' 'packets/s' 'nfacct' '' stacked %d %d %s\n"
+               , NETDATA_CHART_PRIO_NETFILTER_PACKETS
+               , nfacct_root.update_every
+               , PLUGIN_NFACCT_NAME
+        );
+    }
+
+    for(d = nfacct_root.nfacct_metrics; d ; d = d->next) {
+        if(likely(d->updated)) {
+            if(unlikely(!d->packets_dimension_added)) {
+                d->packets_dimension_added = 1;
+                printf(
+                    "CHART netfilter.nfacct_packets '' 'Netfilter Accounting Packets' 'packets/s' 'nfacct' '' stacked %d %d %s\n",
+                    NETDATA_CHART_PRIO_NETFILTER_PACKETS,
+                    nfacct_root.update_every,
+                    PLUGIN_NFACCT_NAME);
+                printf("DIMENSION %s '' incremental 1 %d\n", d->name, nfacct_root.update_every);
+            }
+        }
+    }
+    printf("BEGIN netfilter.nfacct_packets\n");
+    for(d = nfacct_root.nfacct_metrics; d ; d = d->next) {
+        if(likely(d->updated)) {
+            printf("SET %s = %lld\n"
+                    , d->name
+                    , (collected_number)d->pkts
+            );
+        }
+    }
+    printf("END\n");
+
+    // ----------------------------------------------------------------
+
+    if(!bytes_chart_generated) {
+        bytes_chart_generated = 1;
+        printf("CHART netfilter.nfacct_bytes '' 'Netfilter Accounting Bandwidth' 'kilobytes/s' 'nfacct' '' stacked %d %d %s\n"
+               , NETDATA_CHART_PRIO_NETFILTER_BYTES
+               , nfacct_root.update_every
+               , PLUGIN_NFACCT_NAME
+        );
+    }
+
+    for(d = nfacct_root.nfacct_metrics; d ; d = d->next) {
+        if(likely(d->updated)) {
+            if(unlikely(!d->bytes_dimension_added)) {
+                d->bytes_dimension_added = 1;
+                printf(
+                    "CHART netfilter.nfacct_bytes '' 'Netfilter Accounting Bandwidth' 'kilobytes/s' 'nfacct' '' stacked %d %d %s\n",
+                    NETDATA_CHART_PRIO_NETFILTER_BYTES,
+                    nfacct_root.update_every,
+                    PLUGIN_NFACCT_NAME);
+                printf("DIMENSION %s '' incremental 1 %d\n", d->name, 1000 * nfacct_root.update_every);
+            }
+        }
+    }
+    printf("BEGIN netfilter.nfacct_bytes\n");
+    for(d = nfacct_root.nfacct_metrics; d ; d = d->next) {
+        if(likely(d->updated)) {
+            printf("SET %s = %lld\n"
+                   , d->name
+                   , (collected_number)d->bytes
+            );
+        }
+    }
+    printf("END\n");
+}
+
+static void nfacct_signal_handler(int signo)
+{
+    exit((signo == SIGPIPE)?1:0);
+}
+
+// When Netdata crashes this plugin was becoming zombie,
+// this function was added to remove it when sigpipe and other signals are received.
+void nfacct_signals()
+{
+    int signals[] = { SIGPIPE, SIGINT, SIGTERM, 0};
+    int i;
+    struct sigaction sa;
+    sa.sa_flags = 0;
+    sa.sa_handler = nfacct_signal_handler;
+
+    // ignore all signals while we run in a signal handler
+    sigfillset(&sa.sa_mask);
+
+    for (i = 0; signals[i]; i++) {
+        if(sigaction(signals[i], &sa, NULL) == -1)
+            error("Cannot add the handler to signal %d", signals[i]);
+    }
+}
+
+int main(int argc, char **argv) {
+    clocks_init();
+
+    // ------------------------------------------------------------------------
+    // initialization of netdata plugin
+
+    program_name = "nfacct.plugin";
+
+    // disable syslog
+    error_log_syslog = 0;
+
+    // set errors flood protection to 100 logs per hour
+    error_log_errors_per_period = 100;
+    error_log_throttle_period = 3600;
+
+    // ------------------------------------------------------------------------
+    // parse command line parameters
+
+    int i, freq = 0;
+    for(i = 1; i < argc ; i++) {
+        if(isdigit(*argv[i]) && !freq) {
+            int n = str2i(argv[i]);
+            if(n > 0 && n < 86400) {
+                freq = n;
+                continue;
+            }
+        }
+        else if(strcmp("version", argv[i]) == 0 || strcmp("-version", argv[i]) == 0 || strcmp("--version", argv[i]) == 0 || strcmp("-v", argv[i]) == 0 || strcmp("-V", argv[i]) == 0) {
+            printf("nfacct.plugin %s\n", VERSION);
+            exit(0);
+        }
+        else if(strcmp("debug", argv[i]) == 0) {
+            debug = 1;
+            continue;
+        }
+        else if(strcmp("-h", argv[i]) == 0 || strcmp("--help", argv[i]) == 0) {
+            fprintf(stderr,
+                    "\n"
+                    " netdata nfacct.plugin %s\n"
+                    " Copyright (C) 2015-2017 Costa Tsaousis <costa@tsaousis.gr>\n"
+                    " Released under GNU General Public License v3 or later.\n"
+                    " All rights reserved.\n"
+                    "\n"
+                    " This program is a data collector plugin for netdata.\n"
+                    "\n"
+                    " Available command line options:\n"
+                    "\n"
+                    "  COLLECTION_FREQUENCY    data collection frequency in seconds\n"
+                    "                          minimum: %d\n"
+                    "\n"
+                    "  debug                   enable verbose output\n"
+                    "                          default: disabled\n"
+                    "\n"
+                    "  -v\n"
+                    "  -V\n"
+                    "  --version               print version and exit\n"
+                    "\n"
+                    "  -h\n"
+                    "  --help                  print this message and exit\n"
+                    "\n"
+                    " For more information:\n"
+                    " https://github.com/netdata/netdata/tree/master/collectors/nfacct.plugin\n"
+                    "\n"
+                    , VERSION
+                    , netdata_update_every
+            );
+            exit(1);
+        }
+
+        error("nfacct.plugin: ignoring parameter '%s'", argv[i]);
+    }
+
+    nfacct_signals();
+
+    errno = 0;
+
+    if(freq >= netdata_update_every)
+        netdata_update_every = freq;
+    else if(freq)
+        error("update frequency %d seconds is too small for NFACCT. Using %d.", freq, netdata_update_every);
+
+    if (debug)
+        fprintf(stderr, "nfacct.plugin: calling nfacct_init()\n");
+    int nfacct = !nfacct_init(netdata_update_every);
+
+    if (debug)
+        fprintf(stderr, "nfacct.plugin: calling nfstat_init()\n");
+    int nfstat = !nfstat_init(netdata_update_every);
+
+    // ------------------------------------------------------------------------
+    // the main loop
+
+    if(debug) fprintf(stderr, "nfacct.plugin: starting data collection\n");
+
+    time_t started_t = now_monotonic_sec();
+
+    size_t iteration;
+    usec_t step = netdata_update_every * USEC_PER_SEC;
+
+    heartbeat_t hb;
+    heartbeat_init(&hb);
+    for(iteration = 0; 1; iteration++) {
+        usec_t dt = heartbeat_next(&hb, step);
+
+        if(unlikely(netdata_exit)) break;
+
+        if(debug && iteration)
+            fprintf(stderr, "nfacct.plugin: iteration %zu, dt %llu usec\n"
+                    , iteration
+                    , dt
+            );
+
+        if(likely(nfacct)) {
+            if(debug) fprintf(stderr, "nfacct.plugin: calling nfacct_collect()\n");
+            nfacct = !nfacct_collect();
+
+            if(likely(nfacct)) {
+                if(debug) fprintf(stderr, "nfacct.plugin: calling nfacct_send_metrics()\n");
+                nfacct_send_metrics();
+            }
+        }
+
+        if(likely(nfstat)) {
+            if(debug) fprintf(stderr, "nfacct.plugin: calling nfstat_collect()\n");
+            nfstat = !nfstat_collect();
+
+            if(likely(nfstat)) {
+                if(debug) fprintf(stderr, "nfacct.plugin: calling nfstat_send_metrics()\n");
+                nfstat_send_metrics();
+            }
+        }
+
+        fflush(stdout);
+
+        // restart check (14400 seconds)
+        if(now_monotonic_sec() - started_t > 14400) break;
+    }
+
+    info("NFACCT process exiting");
+}