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ipt_NETFLOW.c
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/* SPDX-License-Identifier: GPL-2.0-only
*
* This is NetFlow exporting module (NETFLOW target) for linux
* (c) 2008-2021 <[email protected]>
*
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/vmalloc.h>
#include <linux/seq_file.h>
#include <linux/random.h>
#include <linux/in6.h>
#include <linux/inet.h>
#include <linux/kernel.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/icmp.h>
#include <linux/igmp.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/hash.h>
#include <linux/delay.h>
#include <linux/spinlock_types.h>
#include <linux/ktime.h>
#include <linux/if_arp.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/tcp.h>
#include <net/route.h>
#include <net/ip6_fib.h>
#include <net/addrconf.h>
#include <net/dst.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_bridge.h>
#ifndef ENABLE_NAT
# undef CONFIG_NF_NAT_NEEDED
#endif
#if defined(ENABLE_VLAN) || defined(ENABLE_PROMISC)
# include <linux/if_vlan.h>
#endif
#ifdef ENABLE_MAC
# include <linux/if_ether.h>
# include <linux/etherdevice.h>
#endif
#if defined(CONFIG_NF_NAT_NEEDED)
# include <linux/notifier.h>
# include <net/netfilter/nf_conntrack.h>
# include <net/netfilter/nf_conntrack_core.h>
#endif
#include <linux/version.h>
#include <asm/unaligned.h>
#ifdef HAVE_LLIST
/* llist.h is officially defined since linux 3.1,
* but centos6 have it backported on its 2.6.32.el6 */
# include <linux/llist.h>
#endif
#include "compat.h"
#include "ipt_NETFLOW.h"
#include "murmur3.h"
#ifdef CONFIG_SYSCTL
# include <linux/sysctl.h>
#endif
#ifndef CONFIG_NF_CONNTRACK_EVENTS
/* No conntrack events in the kernel imply no natevents. */
# undef CONFIG_NF_NAT_NEEDED
#endif
#if defined(CONFIG_NF_NAT_NEEDED) && LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
# include <net/netfilter/nf_conntrack_timestamp.h>
#endif
#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
# ifdef ENABLE_PHYSDEV_OVER
# warning "Requested physdev override is not compiled."
# undef ENABLE_PHYSDEV_OVER
# endif
# ifdef ENABLE_PHYSDEV
# warning "Requested physdev is not compiled."
# undef ENABLE_PHYSDEV
# endif
#endif
#define IPT_NETFLOW_VERSION "2.6" /* Note that if you are using git, you
will see version in other format. */
#include "version.h"
#ifdef GITVERSION
#undef IPT_NETFLOW_VERSION
#define IPT_NETFLOW_VERSION GITVERSION
#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("<[email protected]>");
MODULE_DESCRIPTION("iptables NETFLOW target module");
MODULE_VERSION(IPT_NETFLOW_VERSION);
MODULE_ALIAS("ip6t_NETFLOW");
static char version_string[128];
static int version_string_size;
static struct duration start_ts; /* ts of module start (ktime) */
#define DST_SIZE 256
static char destination_buf[DST_SIZE] = "127.0.0.1:2055";
static char *destination = destination_buf;
module_param(destination, charp, 0444);
MODULE_PARM_DESC(destination, "export destination ipaddress:port");
#ifdef ENABLE_SAMPLER
static char sampler_buf[128] = "";
static char *sampler = sampler_buf;
module_param(sampler, charp, 0444);
MODULE_PARM_DESC(sampler, "flow sampler parameters");
static atomic_t flow_count = ATOMIC_INIT(0); /* flow counter for deterministic sampler */
static atomic64_t flows_observed = ATOMIC_INIT(0);
static atomic64_t flows_selected = ATOMIC_INIT(0);
#define SAMPLER_INFO_INTERVAL (5*60)
static unsigned long ts_sampler_last = 0; /* template send time (jiffies) */
static struct duration sampling_ts; /* ts of sampling start (ktime) */
#define SAMPLER_SHIFT 14
#define SAMPLER_INTERVAL_M ((1 << SAMPLER_SHIFT) - 1)
enum {
SAMPLER_DETERMINISTIC = 1,
SAMPLER_RANDOM = 2,
SAMPLER_HASH = 3
};
struct sampling {
union {
u32 v32;
struct {
u8 mode;
u16 interval;
};
};
} samp;
#endif
static int inactive_timeout = 15;
module_param(inactive_timeout, int, 0644);
MODULE_PARM_DESC(inactive_timeout, "inactive flows timeout in seconds");
static int active_timeout = 30 * 60;
module_param(active_timeout, int, 0644);
MODULE_PARM_DESC(active_timeout, "active flows timeout in seconds");
static int exportcpu = -1;
module_param(exportcpu, int, 0644);
MODULE_PARM_DESC(exportcpu, "lock exporter to this cpu");
#ifdef ENABLE_PROMISC
static int promisc = 0;
module_param(promisc, int, 0444);
MODULE_PARM_DESC(promisc, "enable promisc hack (0=default, 1)");
static DEFINE_MUTEX(promisc_lock);
#endif
static int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "debug verbosity level");
static int sndbuf;
module_param(sndbuf, int, 0444);
MODULE_PARM_DESC(sndbuf, "udp socket SNDBUF size");
static int protocol = 5;
module_param(protocol, int, 0444);
MODULE_PARM_DESC(protocol, "netflow protocol version (5, 9, 10=IPFIX)");
static unsigned int refresh_rate = 20;
module_param(refresh_rate, uint, 0644);
MODULE_PARM_DESC(refresh_rate, "NetFlow v9/IPFIX refresh rate (packets)");
static unsigned int timeout_rate = 30;
module_param(timeout_rate, uint, 0644);
MODULE_PARM_DESC(timeout_rate, "NetFlow v9/IPFIX timeout rate (minutes)");
static int one = 1;
static unsigned int scan_min = 1;
static unsigned int scan_max = HZ / 10;
module_param(scan_min, uint, 0644);
MODULE_PARM_DESC(scan_min, "Minimal interval between export scans (jiffies)");
#ifdef SNMP_RULES
static char snmp_rules_buf[DST_SIZE] = "";
static char *snmp_rules = snmp_rules_buf;
module_param(snmp_rules, charp, 0444);
MODULE_PARM_DESC(snmp_rules, "SNMP-index conversion rules");
static unsigned char *snmp_ruleset;
static DEFINE_SPINLOCK(snmp_lock);
#endif
#ifdef CONFIG_NF_NAT_NEEDED
static int natevents = 0;
module_param(natevents, int, 0444);
MODULE_PARM_DESC(natevents, "enable NAT Events");
#endif
static int hashsize;
module_param(hashsize, int, 0444);
MODULE_PARM_DESC(hashsize, "hash table size");
static int maxflows = 2000000;
module_param(maxflows, int, 0644);
MODULE_PARM_DESC(maxflows, "maximum number of flows");
static int peakflows = 0;
static unsigned long peakflows_at; /* jfffies */
static int engine_id = 0;
module_param(engine_id, int, 0644);
MODULE_PARM_DESC(engine_id, "Observation Domain ID");
#ifdef ENABLE_AGGR
#define AGGR_SIZE 1024
static char aggregation_buf[AGGR_SIZE] = "";
static char *aggregation = aggregation_buf;
module_param(aggregation, charp, 0400);
MODULE_PARM_DESC(aggregation, "aggregation ruleset");
static LIST_HEAD(aggr_n_list);
static LIST_HEAD(aggr_p_list);
static DEFINE_RWLOCK(aggr_lock);
static void aggregation_remove(struct list_head *list);
static int add_aggregation(char *ptr);
#endif
static DEFINE_PER_CPU(struct ipt_netflow_stat, ipt_netflow_stat);
static LIST_HEAD(usock_list);
static DEFINE_MUTEX(sock_lock);
#define LOCK_COUNT (1<<8)
#define LOCK_COUNT_MASK (LOCK_COUNT-1)
struct stripe_entry {
struct list_head list; /* struct ipt_netflow, list for export */
spinlock_t lock; /* this locks both: hash table stripe & list above */
};
static struct stripe_entry htable_stripes[LOCK_COUNT];
static DEFINE_RWLOCK(htable_rwlock); /* global rwlock to protect htable[] resize */
static struct hlist_head *htable __read_mostly; /* hash table memory */
static unsigned int htable_size __read_mostly = 0; /* buckets */
/* How it's organized:
* htable_rwlock locks access to htable[hash], where
* htable[htable_size] is big/resizable hash table, which is striped into
* htable_stripes[LOCK_COUNT] smaller/static hash table, which contains
* .list - list of flows ordered by exportability (usually it's access time)
* .lock - lock to both: that .list and to htable[hash], where
* hash to the htable[] is hash_netflow(&tuple) % htable_size
* hash to the htable_stripes[] is hash & LOCK_COUNT_MASK
*/
#ifdef HAVE_LLIST
static LLIST_HEAD(export_llist); /* flows to purge */
#endif
#ifdef CONFIG_NF_NAT_NEEDED
static LIST_HEAD(nat_list); /* nat events */
static DEFINE_SPINLOCK(nat_lock);
static unsigned long nat_events_start = 0;
static unsigned long nat_events_stop = 0;
#endif
static struct kmem_cache *ipt_netflow_cachep __read_mostly; /* ipt_netflow memory */
static atomic_t ipt_netflow_count = ATOMIC_INIT(0);
static long long pdu_packets = 0, pdu_traf = 0; /* how much accounted traffic in pdu */
static unsigned int pdu_count = 0;
static unsigned int pdu_seq = 0;
static unsigned int pdu_data_records = 0; /* Data records */
static unsigned int pdu_flow_records = 0; /* Data records with flows (for stat only) */
static unsigned int pdu_tpl_records = 0;
static unsigned long pdu_ts_mod; /* ts(jiffies) of last flow */
static unsigned int pdu_needs_export = 0;
static union {
__be16 version;
struct netflow5_pdu v5;
struct netflow9_pdu v9;
struct ipfix_pdu ipfix;
} pdu;
static __u8 *pdu_data_used;
static __u8 *pdu_high_wm; /* high watermark */
static struct flowset_data *pdu_flowset = NULL; /* current data flowset */
static unsigned long wk_start; /* last start of worker (jiffies) */
static unsigned long wk_busy; /* last work busy time (jiffies) */
static unsigned int wk_count; /* how much is scanned */
static unsigned int wk_cpu;
static unsigned int wk_trylock;
static unsigned int wk_llist;
static void (*netflow_export_flow)(struct ipt_netflow *nf);
static void (*netflow_export_pdu)(void); /* called on timeout */
static void netflow_switch_version(int ver);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
static void netflow_work_fn(void *work);
static DECLARE_WORK(netflow_work, netflow_work_fn, NULL);
#else
static void netflow_work_fn(struct work_struct *work);
static DECLARE_DELAYED_WORK(netflow_work, netflow_work_fn);
#endif
static struct timer_list rate_timer;
#define TCP_SYN_ACK 0x12
#define TCP_FIN_RST 0x05
static long long sec_prate = 0, sec_brate = 0;
static long long min_prate = 0, min_brate = 0;
static long long min5_prate = 0, min5_brate = 0;
#define METRIC_DFL 100
static int metric = METRIC_DFL,
min15_metric = METRIC_DFL,
min5_metric = METRIC_DFL,
min_metric = METRIC_DFL; /* hash metrics */
static int set_hashsize(int new_size);
static void destination_removeall(void);
static int add_destinations(const char *ptr);
static int netflow_scan_and_export(int flush);
enum {
DONT_FLUSH, AND_FLUSH
};
static int template_ids = FLOWSET_DATA_FIRST;
static int tpl_gen_count = 0; /* how much templates */
static int tpl_count = 0; /* how much active templates */
#define STAT_INTERVAL (1*60)
#define SYSINFO_INTERVAL (5*60)
static unsigned long ts_stat_last = 0; /* (jiffies) */
static unsigned long ts_sysinf_last = 0; /* (jiffies) */
static unsigned long ts_ifnames_last = 0; /* (jiffies) */
static inline __be32 bits2mask(int bits) {
return (bits? 0xffffffff << (32 - bits) : 0);
}
static inline int mask2bits(__be32 mask) {
int n;
for (n = 0; mask; n++)
mask = (mask << 1) & 0xffffffff;
return n;
}
/* under that lock worker is always stopped and not rescheduled,
* and we can call worker sub-functions manually */
static DEFINE_MUTEX(worker_lock);
static int worker_delay = HZ / 10;
static inline void _schedule_scan_worker(const int pdus)
{
int cpu = exportcpu;
/* rudimentary congestion avoidance */
if (pdus > 0)
worker_delay /= pdus;
else
worker_delay *= 2;
if (worker_delay < scan_min)
worker_delay = scan_min;
else if (worker_delay > scan_max)
worker_delay = scan_max;
if (cpu >= 0) {
if (cpu < NR_CPUS &&
cpu_online(cpu)) {
schedule_delayed_work_on(cpu, &netflow_work, worker_delay);
return;
}
printk(KERN_WARNING "ipt_NETFLOW: can't schedule exporter on cpu %d. Disabling cpu lock.\n",
cpu);
exportcpu = -1;
}
schedule_delayed_work(&netflow_work, worker_delay);
}
/* This is only called soon after pause_scan_worker. */
static inline void cont_scan_worker(void)
{
_schedule_scan_worker(0);
mutex_unlock(&worker_lock);
}
static inline void _unschedule_scan_worker(void)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
cancel_rearming_delayed_work(&netflow_work);
#else
cancel_delayed_work_sync(&netflow_work);
#endif
}
/* This is only used for quick pause (in procctl). */
static inline void pause_scan_worker(void)
{
mutex_lock(&worker_lock);
_unschedule_scan_worker();
}
#ifdef ENABLE_SAMPLER
static inline unsigned char get_sampler_mode(void)
{
return samp.mode;
}
static inline unsigned short get_sampler_interval(void)
{
return samp.interval;
}
static inline const char *sampler_mode_string(void)
{
const unsigned char mode = get_sampler_mode();
return mode == SAMPLER_DETERMINISTIC? "deterministic" :
mode == SAMPLER_RANDOM? "random" : "hash";
}
/* map SAMPLER_HASH into SAMPLER_RANDOM */
static unsigned char get_sampler_mode_nf(void)
{
const unsigned char mode = get_sampler_mode();
return (mode == SAMPLER_HASH)? SAMPLER_RANDOM : mode;
}
static inline unsigned short sampler_nf_v5(void)
{
return (get_sampler_mode_nf() << SAMPLER_SHIFT) | get_sampler_interval();
}
#endif
/* return value is different from usual snprintf */
static char *snprintf_sockaddr(char *buf, size_t len, const struct sockaddr_storage *ss)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
if (ss->ss_family == AF_INET) {
const struct sockaddr_in *sin = (struct sockaddr_in *)ss;
snprintf(buf, len, "%u.%u.%u.%u:%u",
NIPQUAD(sin->sin_addr.s_addr),
ntohs(sin->sin_port));
} else if (ss->ss_family == AF_INET6) {
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ss;
snprintf(buf, len, "[%x:%x:%x:%x:%x:%x:%x:%x]:%u",
ntohs(sin6->sin6_addr.s6_addr16[0]),
ntohs(sin6->sin6_addr.s6_addr16[1]),
ntohs(sin6->sin6_addr.s6_addr16[2]),
ntohs(sin6->sin6_addr.s6_addr16[3]),
ntohs(sin6->sin6_addr.s6_addr16[4]),
ntohs(sin6->sin6_addr.s6_addr16[5]),
ntohs(sin6->sin6_addr.s6_addr16[6]),
ntohs(sin6->sin6_addr.s6_addr16[7]),
ntohs(sin6->sin6_port));
} else
snprintf(buf, len, "(invalid address)");
#elif LINUX_VERSION_CODE < KERNEL_VERSION(3,11,0)
if (ss->ss_family == AF_INET)
snprintf(buf, len, "%pI4:%u",
&((const struct sockaddr_in *)ss)->sin_addr,
ntohs(((const struct sockaddr_in *)ss)->sin_port));
else if (ss->ss_family == AF_INET6)
snprintf(buf, len, "[%pI6c]:%u",
&((const struct sockaddr_in6 *)ss)->sin6_addr,
ntohs(((const struct sockaddr_in6 *)ss)->sin6_port));
else
snprintf(buf, len, "(invalid address)");
#else
snprintf(buf, len, "%pISpc", ss);
#endif
return buf;
}
static char *print_sockaddr(const struct sockaddr_storage *ss)
{
static char buf[64];
return snprintf_sockaddr(buf, sizeof(buf), ss);
}
static int is_zero_addr(const struct sockaddr_storage *ss)
{
if (ss->ss_family == AF_INET)
return ((const struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
else if (ss->ss_family == AF_INET6)
return ((const struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
((const struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
((const struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
((const struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
else /* AF_UNSPEC */
return 1;
}
static char *print_usock_addr(struct ipt_netflow_sock *usock)
{
static char buf[128];
size_t len;
snprintf(buf, sizeof(buf), "%s", print_sockaddr(&usock->addr));
if (!is_zero_addr(&usock->saddr)) {
len = strlen(buf);
snprintf(buf + len, sizeof(buf) - len, "@%s",
print_sockaddr(&usock->saddr));
len = strlen(buf);
/* strip zero port */
if (len > 2 && buf[len - 1] == '0' && buf[len - 2] == ':')
buf[len - 2] = '\0';
}
if (usock->sdev[0]) {
len = strlen(buf);
snprintf(buf + len, sizeof(buf) - len, "%%%s", usock->sdev);
}
return buf;
}
#ifdef CONFIG_PROC_FS
static inline int ABS(int x) { return x >= 0 ? x : -x; }
#define SAFEDIV(x,y) ((y)? ({ u64 __tmp = x; do_div(__tmp, y); (int)__tmp; }) : 0)
#define FFLOAT(x, prec) (int)(x) / prec, ABS((int)(x) % prec)
static int snmp_seq_show(struct seq_file *seq, void *v)
{
int cpu;
unsigned int nr_flows = atomic_read(&ipt_netflow_count);
struct ipt_netflow_stat t = { 0 };
struct ipt_netflow_sock *usock;
unsigned int sndbuf_peak = 0;
int snum = 0;
for_each_present_cpu(cpu) {
struct ipt_netflow_stat *st = &per_cpu(ipt_netflow_stat, cpu);
t.notfound += st->notfound;
t.pkt_total += st->pkt_total;
t.traf_total += st->traf_total;
t.send_failed += st->send_failed;
t.sock_cberr += st->sock_cberr;
t.exported_rate += st->exported_rate;
t.exported_pkt += st->exported_pkt;
t.exported_flow += st->exported_flow;
t.exported_traf += st->exported_traf;
t.pkt_drop += st->pkt_drop;
t.traf_drop += st->traf_drop;
t.pkt_lost += st->pkt_lost;
t.traf_lost += st->traf_lost;
t.flow_lost += st->flow_lost;
}
seq_printf(seq,
"inBitRate %llu\n"
"inPacketRate %llu\n"
"inFlows %llu\n"
"inPackets %llu\n"
"inBytes %llu\n"
"hashMetric %d.%02d\n"
"hashMemory %lu\n"
"hashFlows %u\n"
"hashPackets %llu\n"
"hashBytes %llu\n"
"dropPackets %llu\n"
"dropBytes %llu\n"
"outByteRate %u\n"
"outFlows %llu\n"
"outPackets %llu\n"
"outBytes %llu\n"
"lostFlows %llu\n"
"lostPackets %llu\n"
"lostBytes %llu\n"
"errTotal %u\n",
sec_brate,
sec_prate,
t.notfound,
t.pkt_total,
t.traf_total,
FFLOAT(SAFEDIV(100LL * (t.searched + t.found + t.notfound), (t.found + t.notfound)), 100),
(unsigned long)nr_flows * sizeof(struct ipt_netflow) +
(unsigned long)htable_size * sizeof(struct hlist_head),
nr_flows,
t.pkt_total - t.pkt_out,
t.traf_total - t.traf_out,
t.pkt_drop,
t.traf_drop,
t.exported_rate,
t.exported_flow,
t.exported_pkt,
t.exported_traf,
t.flow_lost,
t.pkt_lost,
t.traf_lost,
t.send_failed + t.sock_cberr);
for_each_present_cpu(cpu) {
struct ipt_netflow_stat *st = &per_cpu(ipt_netflow_stat, cpu);
seq_printf(seq,
"cpu%u %u %llu %llu %llu %d.%02d %llu %llu %u %u %u %u\n",
cpu,
st->pkt_total_rate,
st->notfound,
st->pkt_total,
st->traf_total,
FFLOAT(st->metric, 100),
st->pkt_drop,
st->traf_drop,
st->truncated,
st->frags,
st->alloc_err,
st->maxflows_err);
}
mutex_lock(&sock_lock);
list_for_each_entry(usock, &usock_list, list) {
int wmem_peak = atomic_read(&usock->wmem_peak);
if (sndbuf_peak < wmem_peak)
sndbuf_peak = wmem_peak;
seq_printf(seq, "sock%d %s %d %u %u %u %u",
snum,
print_usock_addr(usock),
!!usock->sock,
usock->err_connect,
usock->err_full,
usock->err_cberr,
usock->err_other);
if (usock->sock) {
struct sock *sk = usock->sock->sk;
seq_printf(seq, " %u %u %u\n",
sk->sk_sndbuf,
compat_refcount_read(&sk->sk_wmem_alloc),
wmem_peak);
} else
seq_printf(seq, " 0 0 %u\n", wmem_peak);
snum++;
}
mutex_unlock(&sock_lock);
seq_printf(seq, "sndbufPeak %u\n", sndbuf_peak);
return 0;
}
/* procfs statistics /proc/net/stat/ipt_netflow */
static int nf_seq_show(struct seq_file *seq, void *v)
{
unsigned int nr_flows = atomic_read(&ipt_netflow_count);
int cpu;
struct ipt_netflow_stat t = { 0 };
struct ipt_netflow_sock *usock;
#ifdef ENABLE_AGGR
struct netflow_aggr_n *aggr_n;
struct netflow_aggr_p *aggr_p;
#endif
int snum = 0;
int peak = (jiffies - peakflows_at) / HZ;
seq_printf(seq, "ipt_NETFLOW " IPT_NETFLOW_VERSION ", srcversion %s;"
#ifdef ENABLE_AGGR
" aggr"
#endif
#ifdef ENABLE_DIRECTION
" dir"
#endif
#ifdef HAVE_LLIST
" llist"
#endif
#ifdef ENABLE_MAC
" mac"
#endif
#ifdef CONFIG_NF_NAT_NEEDED
" nel"
#endif
#ifdef ENABLE_PROMISC
" promisc"
# ifdef PROMISC_MPLS
"+mpls"
# endif
#endif
#ifdef ENABLE_SAMPLER
" samp"
# ifdef SAMPLING_HASH
"-h"
# endif
#endif
#ifdef SNMP_RULES
" snmp"
#endif
#ifdef ENABLE_VLAN
" vlan"
#endif
"\n",
THIS_MODULE->srcversion);
seq_printf(seq, "Protocol version %d", protocol);
if (protocol == 10)
seq_printf(seq, " (ipfix)");
else
seq_printf(seq, " (netflow)");
if (protocol >= 9)
seq_printf(seq, ", refresh-rate %u, timeout-rate %u, (templates %d, active %d).\n",
refresh_rate, timeout_rate, tpl_gen_count, tpl_count);
else
seq_printf(seq, "\n");
seq_printf(seq, "Timeouts: active %ds, inactive %ds. Maxflows %u\n",
active_timeout,
inactive_timeout,
maxflows);
for_each_present_cpu(cpu) {
struct ipt_netflow_stat *st = &per_cpu(ipt_netflow_stat, cpu);
t.searched += st->searched;
t.found += st->found;
t.notfound += st->notfound;
t.pkt_total += st->pkt_total;
t.traf_total += st->traf_total;
#ifdef ENABLE_PROMISC
t.pkt_promisc += st->pkt_promisc;
t.pkt_promisc_drop += st->pkt_promisc_drop;
#endif
t.truncated += st->truncated;
t.frags += st->frags;
t.maxflows_err += st->maxflows_err;
t.alloc_err += st->alloc_err;
t.send_failed += st->send_failed;
t.sock_cberr += st->sock_cberr;
t.exported_rate += st->exported_rate;
t.exported_pkt += st->exported_pkt;
t.exported_flow += st->exported_flow;
t.exported_traf += st->exported_traf;
t.pkt_total_rate += st->pkt_total_rate;
t.pkt_drop += st->pkt_drop;
t.traf_drop += st->traf_drop;
t.pkt_lost += st->pkt_lost;
t.traf_lost += st->traf_lost;
t.flow_lost += st->flow_lost;
t.pkt_out += st->pkt_out;
t.traf_out += st->traf_out;
#ifdef ENABLE_SAMPLER
t.pkts_observed += st->pkts_observed;
t.pkts_selected += st->pkts_selected;
#endif
}
#ifdef ENABLE_SAMPLER
if (get_sampler_mode()) {
seq_printf(seq, "Flow sampling mode %s one-out-of %u.",
sampler_mode_string(),
get_sampler_interval());
if (get_sampler_mode() != SAMPLER_HASH)
seq_printf(seq, " Flows selected %lu, discarded %lu.",
atomic64_read(&flows_selected),
atomic64_read(&flows_observed) - atomic64_read(&flows_selected));
else
seq_printf(seq, " Flows selected %lu.", atomic64_read(&flows_selected));
seq_printf(seq, " Pkts selected %llu, discarded %llu.\n",
t.pkts_selected,
t.pkts_observed - t.pkts_selected);
} else
seq_printf(seq, "Flow sampling is disabled.\n");
#endif
#ifdef ENABLE_PROMISC
seq_printf(seq, "Promisc hack is %s (observed %llu packets, discarded %llu).\n",
promisc? "enabled" : "disabled",
t.pkt_promisc,
t.pkt_promisc_drop);
#endif
#ifdef CONFIG_NF_NAT_NEEDED
seq_printf(seq, "Natevents %s, count start %lu, stop %lu.\n", natevents? "enabled" : "disabled",
nat_events_start, nat_events_stop);
#endif
seq_printf(seq, "Flows: active %u (peak %u reached %ud%uh%um ago), mem %uK, worker delay %d/%d"
" [%d..%d] (%u ms, %u us, %u:%u"
#ifdef HAVE_LLIST
" %u"
#endif
" [cpu%u]).\n",
nr_flows,
peakflows,
peak / (60 * 60 * 24), (peak / (60 * 60)) % 24, (peak / 60) % 60,
(unsigned int)(((unsigned long)nr_flows * sizeof(struct ipt_netflow) +
(unsigned long)htable_size * sizeof(struct hlist_head)) >> 10),
worker_delay, HZ,
scan_min, scan_max,
jiffies_to_msecs(jiffies - wk_start),
jiffies_to_usecs(wk_busy),
wk_count,
wk_trylock,
#ifdef HAVE_LLIST
wk_llist,
#endif
wk_cpu);
seq_printf(seq, "Hash: size %u (mem %uK), metric %d.%02d [%d.%02d, %d.%02d, %d.%02d]."
" InHash: %llu pkt, %llu K, InPDU %llu, %llu.\n",
htable_size,
(unsigned int)((htable_size * sizeof(struct hlist_head)) >> 10),
FFLOAT(metric, 100),
FFLOAT(min_metric, 100),
FFLOAT(min5_metric, 100),
FFLOAT(min15_metric, 100),
t.pkt_total - t.pkt_out,
(t.traf_total - t.traf_out) >> 10,
pdu_packets,
pdu_traf);
seq_printf(seq, "Rate: %llu bits/sec, %llu packets/sec;"
" Avg 1 min: %llu bps, %llu pps; 5 min: %llu bps, %llu pps\n",
sec_brate, sec_prate, min_brate, min_prate, min5_brate, min5_prate);
seq_printf(seq, "cpu# pps; <search found new [metric], trunc frag alloc maxflows>,"
" traffic: <pkt, bytes>, drop: <pkt, bytes>\n");
seq_printf(seq, "Total %6u; %6llu %6llu %6llu [%d.%02d], %4u %4u %4u %4u,"
" traffic: %llu, %llu MB, drop: %llu, %llu K\n",
t.pkt_total_rate,
t.searched,
t.found,
t.notfound,
FFLOAT(SAFEDIV(100LL * (t.searched + t.found + t.notfound), (t.found + t.notfound)), 100),
t.truncated, t.frags, t.alloc_err, t.maxflows_err,
t.pkt_total, t.traf_total >> 20,
t.pkt_drop, t.traf_drop >> 10);
if (num_present_cpus() > 1) {
for_each_present_cpu(cpu) {
struct ipt_netflow_stat *st;
st = &per_cpu(ipt_netflow_stat, cpu);
seq_printf(seq, "cpu%-2u %6u; %6llu %6llu %6llu [%d.%02d], %4u %4u %4u %4u,"
" traffic: %llu, %llu MB, drop: %llu, %llu K\n",
cpu,
st->pkt_total_rate,
st->searched,
st->found,
st->notfound,
FFLOAT(st->metric, 100),
st->truncated, st->frags, st->alloc_err, st->maxflows_err,
st->pkt_total, st->traf_total >> 20,
st->pkt_drop, st->traf_drop >> 10);
}
}
seq_printf(seq, "Export: Rate %u bytes/s; Total %llu pkts, %llu MB, %llu flows;"
" Errors %u pkts; Traffic lost %llu pkts, %llu Kbytes, %llu flows.\n",
t.exported_rate,
t.exported_pkt,
t.exported_traf >> 20,
t.exported_flow,
t.send_failed,
t.pkt_lost,
t.traf_lost >> 10,
t.flow_lost);
mutex_lock(&sock_lock);
list_for_each_entry(usock, &usock_list, list) {
seq_printf(seq, "sock%d: %s",
snum,
print_usock_addr(usock));
if (usock->sock) {
struct sock *sk = usock->sock->sk;
seq_printf(seq, ", sndbuf %u, filled %u, peak %u;"
" err: sndbuf reached %u, connect %u, cberr %u, other %u\n",
sk->sk_sndbuf,
compat_refcount_read(&sk->sk_wmem_alloc),
atomic_read(&usock->wmem_peak),
usock->err_full,
usock->err_connect,
usock->err_cberr,
usock->err_other);
} else
seq_printf(seq, " unconnected (%u attempts).\n",
usock->err_connect);
snum++;
}
mutex_unlock(&sock_lock);
#ifdef ENABLE_AGGR
read_lock_bh(&aggr_lock);
snum = 0;
list_for_each_entry(aggr_n, &aggr_n_list, list) {
seq_printf(seq, "aggr#%d net: match %u.%u.%u.%u/%d strip %d (usage %u)\n",
snum,
HIPQUAD(aggr_n->addr),
mask2bits(aggr_n->mask),
mask2bits(aggr_n->aggr_mask),
atomic_read(&aggr_n->usage));
snum++;
}
snum = 0;
list_for_each_entry(aggr_p, &aggr_p_list, list) {
seq_printf(seq, "aggr#%d port: ports %u-%u replace %u (usage %u)\n",
snum,
aggr_p->port1,
aggr_p->port2,
aggr_p->aggr_port,
atomic_read(&aggr_p->usage));
snum++;
}
read_unlock_bh(&aggr_lock);
#endif
#ifdef SNMP_RULES
{
const unsigned char *rules;
snum = 0;
rcu_read_lock();
rules = rcu_dereference(snmp_ruleset);
if (rules)
while (*rules) {
const unsigned int len = *rules++;
seq_printf(seq, "SNMP-rule#%d: prefix '%.*s' map to %d\n",
snum, len, rules, (rules[len] << 8) + rules[len + 1]);
rules += len + 2;
++snum;
}
rcu_read_unlock();
}
#endif
return 0;
}
static int nf_seq_open(struct inode *inode, struct file *file)
{
return single_open(file, nf_seq_show, NULL);
}
static int snmp_seq_open(struct inode *inode, struct file *file)
{
return single_open(file, snmp_seq_show, NULL);
}
#ifdef HAVE_PROC_OPS
static struct proc_ops nf_seq_fops = {
.proc_open = nf_seq_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
};
#else
static struct file_operations nf_seq_fops = {
.owner = THIS_MODULE,
.open = nf_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#endif
#ifdef HAVE_PROC_OPS
static struct proc_ops snmp_seq_fops = {
.proc_open = snmp_seq_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
};
#else
static struct file_operations snmp_seq_fops = {
.owner = THIS_MODULE,
.open = snmp_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#endif
static inline int inactive_needs_export(const struct ipt_netflow *nf, const long i_timeout,
const unsigned long jiff);
static inline int active_needs_export(const struct ipt_netflow *nf, const long a_timeout,
const unsigned long jiff);
static inline u_int32_t hash_netflow(const struct ipt_netflow_tuple *tuple);
struct flows_dump_private {
int pcache; /* pos */
void *vcache; /* corresponding pointer for pos */
int stripe; /* current stripe */
struct list_head list; /* copy of stripe */
int alloc_errors;
};
/* deallocate copied stripe */
static void nf_free_stripe(struct list_head *list)
{
struct ipt_netflow *cf, *tmp;