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// SPDX-License-Identifier: GPL-3.0-or-later
#include "plugin_proc.h"
#define PLUGIN_PROC_MODULE_SYNPROXY_NAME "/proc/net/stat/synproxy"
#define RRD_TYPE_NET_STAT_NETFILTER "netfilter"
#define RRD_TYPE_NET_STAT_SYNPROXY "synproxy"
int do_proc_net_stat_synproxy(int update_every, usec_t dt) {
(void)dt;
static int do_cookies = -1, do_syns = -1, do_reopened = -1;
static procfile *ff = NULL;
if(unlikely(do_cookies == -1)) {
do_cookies = config_get_boolean_ondemand("plugin:proc:/proc/net/stat/synproxy", "SYNPROXY cookies", CONFIG_BOOLEAN_AUTO);
do_syns = config_get_boolean_ondemand("plugin:proc:/proc/net/stat/synproxy", "SYNPROXY SYN received", CONFIG_BOOLEAN_AUTO);
do_reopened = config_get_boolean_ondemand("plugin:proc:/proc/net/stat/synproxy", "SYNPROXY connections reopened", CONFIG_BOOLEAN_AUTO);
}
if(unlikely(!ff)) {
char filename[FILENAME_MAX + 1];
snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/net/stat/synproxy");
ff = procfile_open(config_get("plugin:proc:/proc/net/stat/synproxy", "filename to monitor", filename), " \t,:|", PROCFILE_FLAG_DEFAULT);
if(unlikely(!ff))
return 1;
}
ff = procfile_readall(ff);
if(unlikely(!ff))
return 0; // we return 0, so that we will retry to open it next time
// make sure we have 3 lines
size_t lines = procfile_lines(ff), l;
if(unlikely(lines < 2)) {
error("/proc/net/stat/synproxy has %zu lines, expected no less than 2. Disabling it.", lines);
return 1;
}
unsigned long long syn_received = 0, cookie_invalid = 0, cookie_valid = 0, cookie_retrans = 0, conn_reopened = 0;
// synproxy gives its values per CPU
for(l = 1; l < lines ;l++) {
size_t words = procfile_linewords(ff, l);
if(unlikely(words < 6))
continue;
syn_received += strtoull(procfile_lineword(ff, l, 1), NULL, 16);
cookie_invalid += strtoull(procfile_lineword(ff, l, 2), NULL, 16);
cookie_valid += strtoull(procfile_lineword(ff, l, 3), NULL, 16);
cookie_retrans += strtoull(procfile_lineword(ff, l, 4), NULL, 16);
conn_reopened += strtoull(procfile_lineword(ff, l, 5), NULL, 16);
}
unsigned long long events = syn_received + cookie_invalid + cookie_valid + cookie_retrans + conn_reopened;
// --------------------------------------------------------------------
if(do_syns == CONFIG_BOOLEAN_YES || (do_syns == CONFIG_BOOLEAN_AUTO &&
(events || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES))) {
do_syns = CONFIG_BOOLEAN_YES;
static RRDSET *st = NULL;
if(unlikely(!st)) {
st = rrdset_create_localhost(
RRD_TYPE_NET_STAT_NETFILTER
, RRD_TYPE_NET_STAT_SYNPROXY "_syn_received"
, NULL
, RRD_TYPE_NET_STAT_SYNPROXY
, NULL
, "SYNPROXY SYN Packets received"
, "packets/s"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_SYNPROXY_NAME
, NETDATA_CHART_PRIO_SYNPROXY_SYN_RECEIVED
, update_every
, RRDSET_TYPE_LINE
);
rrddim_add(st, "received", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
}
rrddim_set(st, "received", syn_received);
rrdset_done(st);
}
// --------------------------------------------------------------------
if(do_reopened == CONFIG_BOOLEAN_YES || (do_reopened == CONFIG_BOOLEAN_AUTO &&
(events || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES))) {
do_reopened = CONFIG_BOOLEAN_YES;
static RRDSET *st = NULL;
if(unlikely(!st)) {
st = rrdset_create_localhost(
RRD_TYPE_NET_STAT_NETFILTER
, RRD_TYPE_NET_STAT_SYNPROXY "_conn_reopened"
, NULL
, RRD_TYPE_NET_STAT_SYNPROXY
, NULL
, "SYNPROXY Connections Reopened"
, "connections/s"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_SYNPROXY_NAME
, NETDATA_CHART_PRIO_SYNPROXY_CONN_OPEN
, update_every
, RRDSET_TYPE_LINE
);
rrddim_add(st, "reopened", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
}
rrddim_set(st, "reopened", conn_reopened);
rrdset_done(st);
}
// --------------------------------------------------------------------
if(do_cookies == CONFIG_BOOLEAN_YES || (do_cookies == CONFIG_BOOLEAN_AUTO &&
(events || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES))) {
do_cookies = CONFIG_BOOLEAN_YES;
static RRDSET *st = NULL;
if(unlikely(!st)) {
st = rrdset_create_localhost(
RRD_TYPE_NET_STAT_NETFILTER
, RRD_TYPE_NET_STAT_SYNPROXY "_cookies"
, NULL
, RRD_TYPE_NET_STAT_SYNPROXY
, NULL
, "SYNPROXY TCP Cookies"
, "cookies/s"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_SYNPROXY_NAME
, NETDATA_CHART_PRIO_SYNPROXY_COOKIES
, update_every
, RRDSET_TYPE_LINE
);
rrddim_add(st, "valid", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
rrddim_add(st, "invalid", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
rrddim_add(st, "retransmits", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
}
rrddim_set(st, "valid", cookie_valid);
rrddim_set(st, "invalid", cookie_invalid);
rrddim_set(st, "retransmits", cookie_retrans);
rrdset_done(st);
}
return 0;
}
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