Release 4.14 net/netfilter/nf_conntrack_core.c
/* Connection state tracking for netfilter. This is separated from,
but required by, the NAT layer; it can also be used by an iptables
extension. */
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
* (C) 2005-2012 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/vmalloc.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/jhash.h>
#include <linux/err.h>
#include <linux/percpu.h>
#include <linux/moduleparam.h>
#include <linux/notifier.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <linux/mm.h>
#include <linux/nsproxy.h>
#include <linux/rculist_nulls.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_seqadj.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_acct.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_conntrack_timestamp.h>
#include <net/netfilter/nf_conntrack_timeout.h>
#include <net/netfilter/nf_conntrack_labels.h>
#include <net/netfilter/nf_conntrack_synproxy.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netns/hash.h>
#include "nf_internals.h"
#define NF_CONNTRACK_VERSION "0.5.0"
int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct,
enum nf_nat_manip_type manip,
const struct nlattr *attr) __read_mostly;
EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook);
__cacheline_aligned_in_smp spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
EXPORT_SYMBOL_GPL(nf_conntrack_locks);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(nf_conntrack_expect_lock);
EXPORT_SYMBOL_GPL(nf_conntrack_expect_lock);
struct hlist_nulls_head *nf_conntrack_hash __read_mostly;
EXPORT_SYMBOL_GPL(nf_conntrack_hash);
struct conntrack_gc_work {
struct delayed_work dwork;
u32 last_bucket;
bool exiting;
bool early_drop;
long next_gc_run;
};
static __read_mostly struct kmem_cache *nf_conntrack_cachep;
static __read_mostly spinlock_t nf_conntrack_locks_all_lock;
static __read_mostly DEFINE_SPINLOCK(nf_conntrack_locks_all_lock);
static __read_mostly bool nf_conntrack_locks_all;
/* every gc cycle scans at most 1/GC_MAX_BUCKETS_DIV part of table */
#define GC_MAX_BUCKETS_DIV 128u
/* upper bound of full table scan */
#define GC_MAX_SCAN_JIFFIES (16u * HZ)
/* desired ratio of entries found to be expired */
#define GC_EVICT_RATIO 50u
static struct conntrack_gc_work conntrack_gc_work;
void nf_conntrack_lock(spinlock_t *lock) __acquires(lock)
{
/* 1) Acquire the lock */
spin_lock(lock);
/* 2) read nf_conntrack_locks_all, with ACQUIRE semantics
* It pairs with the smp_store_release() in nf_conntrack_all_unlock()
*/
if (likely(smp_load_acquire(&nf_conntrack_locks_all) == false))
return;
/* fast path failed, unlock */
spin_unlock(lock);
/* Slow path 1) get global lock */
spin_lock(&nf_conntrack_locks_all_lock);
/* Slow path 2) get the lock we want */
spin_lock(lock);
/* Slow path 3) release the global lock */
spin_unlock(&nf_conntrack_locks_all_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Sasha Levin | 38 | 63.33% | 1 | 50.00% |
Manfred Spraul | 22 | 36.67% | 1 | 50.00% |
Total | 60 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_lock);
static void nf_conntrack_double_unlock(unsigned int h1, unsigned int h2)
{
h1 %= CONNTRACK_LOCKS;
h2 %= CONNTRACK_LOCKS;
spin_unlock(&nf_conntrack_locks[h1]);
if (h1 != h2)
spin_unlock(&nf_conntrack_locks[h2]);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jesper Dangaard Brouer | 46 | 100.00% | 1 | 100.00% |
Total | 46 | 100.00% | 1 | 100.00% |
/* return true if we need to recompute hashes (in case hash table was resized) */
static bool nf_conntrack_double_lock(struct net *net, unsigned int h1,
unsigned int h2, unsigned int sequence)
{
h1 %= CONNTRACK_LOCKS;
h2 %= CONNTRACK_LOCKS;
if (h1 <= h2) {
nf_conntrack_lock(&nf_conntrack_locks[h1]);
if (h1 != h2)
spin_lock_nested(&nf_conntrack_locks[h2],
SINGLE_DEPTH_NESTING);
} else {
nf_conntrack_lock(&nf_conntrack_locks[h2]);
spin_lock_nested(&nf_conntrack_locks[h1],
SINGLE_DEPTH_NESTING);
}
if (read_seqcount_retry(&nf_conntrack_generation, sequence)) {
nf_conntrack_double_unlock(h1, h2);
return true;
}
return false;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jesper Dangaard Brouer | 110 | 97.35% | 1 | 33.33% |
Sasha Levin | 2 | 1.77% | 1 | 33.33% |
Florian Westphal | 1 | 0.88% | 1 | 33.33% |
Total | 113 | 100.00% | 3 | 100.00% |
static void nf_conntrack_all_lock(void)
{
int i;
spin_lock(&nf_conntrack_locks_all_lock);
nf_conntrack_locks_all = true;
for (i = 0; i < CONNTRACK_LOCKS; i++) {
spin_lock(&nf_conntrack_locks[i]);
/* This spin_unlock provides the "release" to ensure that
* nf_conntrack_locks_all==true is visible to everyone that
* acquired spin_lock(&nf_conntrack_locks[]).
*/
spin_unlock(&nf_conntrack_locks[i]);
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jesper Dangaard Brouer | 27 | 49.09% | 1 | 33.33% |
Sasha Levin | 17 | 30.91% | 1 | 33.33% |
Manfred Spraul | 11 | 20.00% | 1 | 33.33% |
Total | 55 | 100.00% | 3 | 100.00% |
static void nf_conntrack_all_unlock(void)
{
/* All prior stores must be complete before we clear
* 'nf_conntrack_locks_all'. Otherwise nf_conntrack_lock()
* might observe the false value but not the entire
* critical section.
* It pairs with the smp_load_acquire() in nf_conntrack_lock()
*/
smp_store_release(&nf_conntrack_locks_all, false);
spin_unlock(&nf_conntrack_locks_all_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jesper Dangaard Brouer | 13 | 56.52% | 1 | 25.00% |
Peter Zijlstra | 5 | 21.74% | 1 | 25.00% |
Sasha Levin | 4 | 17.39% | 1 | 25.00% |
Manfred Spraul | 1 | 4.35% | 1 | 25.00% |
Total | 23 | 100.00% | 4 | 100.00% |
unsigned int nf_conntrack_htable_size __read_mostly;
EXPORT_SYMBOL_GPL(nf_conntrack_htable_size);
unsigned int nf_conntrack_max __read_mostly;
seqcount_t nf_conntrack_generation __read_mostly;
static unsigned int nf_conntrack_hash_rnd __read_mostly;
static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple,
const struct net *net)
{
unsigned int n;
u32 seed;
get_random_once(&nf_conntrack_hash_rnd, sizeof(nf_conntrack_hash_rnd));
/* The direction must be ignored, so we hash everything up to the
* destination ports (which is a multiple of 4) and treat the last
* three bytes manually.
*/
seed = nf_conntrack_hash_rnd ^ net_hash_mix(net);
n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32);
return jhash2((u32 *)tuple, n, seed ^
(((__force __u16)tuple->dst.u.all << 16) |
tuple->dst.protonum));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 46 | 42.20% | 1 | 14.29% |
Florian Westphal | 30 | 27.52% | 2 | 28.57% |
Patrick McHardy | 23 | 21.10% | 1 | 14.29% |
Changli Gao | 5 | 4.59% | 1 | 14.29% |
Al Viro | 4 | 3.67% | 1 | 14.29% |
Sami Farin | 1 | 0.92% | 1 | 14.29% |
Total | 109 | 100.00% | 7 | 100.00% |
static u32 scale_hash(u32 hash)
{
return reciprocal_scale(hash, nf_conntrack_htable_size);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Changli Gao | 14 | 82.35% | 1 | 33.33% |
Florian Westphal | 3 | 17.65% | 2 | 66.67% |
Total | 17 | 100.00% | 3 | 100.00% |
static u32 __hash_conntrack(const struct net *net,
const struct nf_conntrack_tuple *tuple,
unsigned int size)
{
return reciprocal_scale(hash_conntrack_raw(tuple, net), size);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Changli Gao | 25 | 71.43% | 1 | 50.00% |
Florian Westphal | 10 | 28.57% | 1 | 50.00% |
Total | 35 | 100.00% | 2 | 100.00% |
static u32 hash_conntrack(const struct net *net,
const struct nf_conntrack_tuple *tuple)
{
return scale_hash(hash_conntrack_raw(tuple, net));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 17 | 58.62% | 1 | 20.00% |
Florian Westphal | 5 | 17.24% | 2 | 40.00% |
Patrick McHardy | 5 | 17.24% | 1 | 20.00% |
Daniel Borkmann | 2 | 6.90% | 1 | 20.00% |
Total | 29 | 100.00% | 5 | 100.00% |
bool
nf_ct_get_tuple(const struct sk_buff *skb,
unsigned int nhoff,
unsigned int dataoff,
u_int16_t l3num,
u_int8_t protonum,
struct net *net,
struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto)
{
memset(tuple, 0, sizeof(*tuple));
tuple->src.l3num = l3num;
if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0)
return false;
tuple->dst.protonum = protonum;
tuple->dst.dir = IP_CT_DIR_ORIGINAL;
return l4proto->pkt_to_tuple(skb, dataoff, net, tuple);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 95 | 81.90% | 1 | 20.00% |
Philip Craig | 9 | 7.76% | 1 | 20.00% |
Eric W. Biedermann | 7 | 6.03% | 1 | 20.00% |
Martin Josefsson | 3 | 2.59% | 1 | 20.00% |
Jan Engelhardt | 2 | 1.72% | 1 | 20.00% |
Total | 116 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_get_tuple);
bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
u_int16_t l3num,
struct net *net, struct nf_conntrack_tuple *tuple)
{
const struct nf_conntrack_l3proto *l3proto;
const struct nf_conntrack_l4proto *l4proto;
unsigned int protoff;
u_int8_t protonum;
int ret;
rcu_read_lock();
l3proto = __nf_ct_l3proto_find(l3num);
ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum);
if (ret != NF_ACCEPT) {
rcu_read_unlock();
return false;
}
l4proto = __nf_ct_l4proto_find(l3num, protonum);
ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, net, tuple,
l3proto, l4proto);
rcu_read_unlock();
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 118 | 91.47% | 1 | 25.00% |
Eric W. Biedermann | 7 | 5.43% | 1 | 25.00% |
Jan Engelhardt | 2 | 1.55% | 1 | 25.00% |
Florian Westphal | 2 | 1.55% | 1 | 25.00% |
Total | 129 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr);
bool
nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto)
{
memset(inverse, 0, sizeof(*inverse));
inverse->src.l3num = orig->src.l3num;
if (l3proto->invert_tuple(inverse, orig) == 0)
return false;
inverse->dst.dir = !orig->dst.dir;
inverse->dst.protonum = orig->dst.protonum;
return l4proto->invert_tuple(inverse, orig);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 90 | 86.54% | 1 | 25.00% |
Philip Craig | 9 | 8.65% | 1 | 25.00% |
Martin Josefsson | 3 | 2.88% | 1 | 25.00% |
Jan Engelhardt | 2 | 1.92% | 1 | 25.00% |
Total | 104 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_invert_tuple);
static void
clean_from_lists(struct nf_conn *ct)
{
pr_debug("clean_from_lists(%p)\n", ct);
hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode);
/* Destroy all pending expectations */
nf_ct_remove_expectations(ct);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Martin Josefsson | 22 | 44.00% | 1 | 16.67% |
Yasuyuki Kozakai | 19 | 38.00% | 1 | 16.67% |
Eric Dumazet | 4 | 8.00% | 1 | 16.67% |
Harald Welte | 3 | 6.00% | 1 | 16.67% |
Patrick McHardy | 2 | 4.00% | 2 | 33.33% |
Total | 50 | 100.00% | 6 | 100.00% |
/* must be called with local_bh_disable */
static void nf_ct_add_to_dying_list(struct nf_conn *ct)
{
struct ct_pcpu *pcpu;
/* add this conntrack to the (per cpu) dying list */
ct->cpu = smp_processor_id();
pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu);
spin_lock(&pcpu->lock);
hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
&pcpu->dying);
spin_unlock(&pcpu->lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jesper Dangaard Brouer | 76 | 100.00% | 1 | 100.00% |
Total | 76 | 100.00% | 1 | 100.00% |
/* must be called with local_bh_disable */
static void nf_ct_add_to_unconfirmed_list(struct nf_conn *ct)
{
struct ct_pcpu *pcpu;
/* add this conntrack to the (per cpu) unconfirmed list */
ct->cpu = smp_processor_id();
pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu);
spin_lock(&pcpu->lock);
hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
&pcpu->unconfirmed);
spin_unlock(&pcpu->lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jesper Dangaard Brouer | 76 | 100.00% | 1 | 100.00% |
Total | 76 | 100.00% | 1 | 100.00% |
/* must be called with local_bh_disable */
static void nf_ct_del_from_dying_or_unconfirmed_list(struct nf_conn *ct)
{
struct ct_pcpu *pcpu;
/* We overload first tuple to link into unconfirmed or dying list.*/
pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu);
spin_lock(&pcpu->lock);
BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode));
hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
spin_unlock(&pcpu->lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jesper Dangaard Brouer | 80 | 100.00% | 1 | 100.00% |
Total | 80 | 100.00% | 1 | 100.00% |
#define NFCT_ALIGN(len) (((len) + NFCT_INFOMASK) & ~NFCT_INFOMASK)
/* Released via destroy_conntrack() */
struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
const struct nf_conntrack_zone *zone,
gfp_t flags)
{
struct nf_conn *tmpl, *p;
if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK) {
tmpl = kzalloc(sizeof(*tmpl) + NFCT_INFOMASK, flags);
if (!tmpl)
return NULL;
p = tmpl;
tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p);
if (tmpl != p) {
tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p);
tmpl->proto.tmpl_padto = (char *)tmpl - (char *)p;
}
} else {
tmpl = kzalloc(sizeof(*tmpl), flags);
if (!tmpl)
return NULL;
}
tmpl->status = IPS_TEMPLATE;
write_pnet(&tmpl->ct_net, net);
nf_ct_zone_add(tmpl, zone);
atomic_set(&tmpl->ct_general.use, 0);
return tmpl;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 100 | 54.35% | 2 | 33.33% |
Pablo Neira Ayuso | 75 | 40.76% | 1 | 16.67% |
Daniel Borkmann | 6 | 3.26% | 2 | 33.33% |
Joe Stringer | 3 | 1.63% | 1 | 16.67% |
Total | 184 | 100.00% | 6 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc);
void nf_ct_tmpl_free(struct nf_conn *tmpl)
{
nf_ct_ext_destroy(tmpl);
nf_ct_ext_free(tmpl);
if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK)
kfree((char *)tmpl - tmpl->proto.tmpl_padto);
else
kfree(tmpl);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 25 | 53.19% | 1 | 50.00% |
Florian Westphal | 22 | 46.81% | 1 | 50.00% |
Total | 47 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_tmpl_free);
static void
destroy_conntrack(struct nf_conntrack *nfct)
{
struct nf_conn *ct = (struct nf_conn *)nfct;
const struct nf_conntrack_l4proto *l4proto;
pr_debug("destroy_conntrack(%p)\n", ct);
WARN_ON(atomic_read(&nfct->use) != 0);
if (unlikely(nf_ct_is_template(ct))) {
nf_ct_tmpl_free(ct);
return;
}
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
if (l4proto->destroy)
l4proto->destroy(ct);
local_bh_disable();
/* Expectations will have been removed in clean_from_lists,
* except TFTP can create an expectation on the first packet,
* before connection is in the list, so we need to clean here,
* too.
*/
nf_ct_remove_expectations(ct);
nf_ct_del_from_dying_or_unconfirmed_list(ct);
local_bh_enable();
if (ct->master)
nf_ct_put(ct->master);
pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct);
nf_conntrack_free(ct);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Martin Josefsson | 58 | 42.34% | 2 | 16.67% |
Yasuyuki Kozakai | 40 | 29.20% | 1 | 8.33% |
Pablo Neira Ayuso | 19 | 13.87% | 2 | 16.67% |
Patrick McHardy | 8 | 5.84% | 2 | 16.67% |
Jesper Dangaard Brouer | 6 | 4.38% | 2 | 16.67% |
Harald Welte | 3 | 2.19% | 1 | 8.33% |
Varsha Rao | 2 | 1.46% | 1 | 8.33% |
Florian Westphal | 1 | 0.73% | 1 | 8.33% |
Total | 137 | 100.00% | 12 | 100.00% |
static void nf_ct_delete_from_lists(struct nf_conn *ct)
{
struct net *net = nf_ct_net(ct);
unsigned int hash, reply_hash;
unsigned int sequence;
nf_ct_helper_destroy(ct);
local_bh_disable();
do {
sequence = read_seqcount_begin(&nf_conntrack_generation);
hash = hash_conntrack(net,
&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
reply_hash = hash_conntrack(net,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
} while (nf_conntrack_double_lock(net, hash, reply_hash, sequence));
clean_from_lists(ct);
nf_conntrack_double_unlock(hash, reply_hash);
nf_ct_add_to_dying_list(ct);
local_bh_enable();
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jesper Dangaard Brouer | 69 | 58.47% | 2 | 28.57% |
Pablo Neira Ayuso | 43 | 36.44% | 2 | 28.57% |
Daniel Borkmann | 4 | 3.39% | 1 | 14.29% |
Florian Westphal | 2 | 1.69% | 2 | 28.57% |
Total | 118 | 100.00% | 7 | 100.00% |
bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report)
{
struct nf_conn_tstamp *tstamp;
if (test_and_set_bit(IPS_DYING_BIT, &ct->status))
return false;
tstamp = nf_conn_tstamp_find(ct);
if (tstamp && tstamp->stop == 0)
tstamp->stop = ktime_get_real_ns();
if (nf_conntrack_event_report(IPCT_DESTROY, ct,
portid, report) < 0) {
/* destroy event was not delivered. nf_ct_put will
* be done by event cache worker on redelivery.
*/
nf_ct_delete_from_lists(ct);
nf_conntrack_ecache_delayed_work(nf_ct_net(ct));
return false;
}
nf_conntrack_ecache_work(nf_ct_net(ct));
nf_ct_delete_from_lists(ct);
nf_ct_put(ct);
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 59 | 51.30% | 2 | 25.00% |
Florian Westphal | 50 | 43.48% | 3 | 37.50% |
Yasuyuki Kozakai | 4 | 3.48% | 1 | 12.50% |
Martin Josefsson | 1 | 0.87% | 1 | 12.50% |
Eric Dumazet | 1 | 0.87% | 1 | 12.50% |
Total | 115 | 100.00% | 8 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_delete);
static inline bool
nf_ct_key_equal(struct nf_conntrack_tuple_hash *h,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_zone *zone,
const struct net *net)
{
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
/* A conntrack can be recreated with the equal tuple,
* so we need to check that the conntrack is confirmed
*/
return nf_ct_tuple_equal(tuple, &h->tuple) &&
nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h)) &&
nf_ct_is_confirmed(ct) &&
net_eq(net, nf_ct_net(ct));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Andrey Vagin | 51 | 64.56% | 1 | 25.00% |
Florian Westphal | 16 | 20.25% | 1 | 25.00% |
Daniel Borkmann | 12 | 15.19% | 2 | 50.00% |
Total | 79 | 100.00% | 4 | 100.00% |
/* caller must hold rcu readlock and none of the nf_conntrack_locks */
static void nf_ct_gc_expired(struct nf_conn *ct)
{
if (!atomic_inc_not_zero(&ct->ct_general.use))
return;
if (nf_ct_should_gc(ct))
nf_ct_kill(ct);
nf_ct_put(ct);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 42 | 100.00% | 1 | 100.00% |
Total | 42 | 100.00% | 1 | 100.00% |
/*
* Warning :
* - Caller must take a reference on returned object
* and recheck nf_ct_tuple_equal(tuple, &h->tuple)
*/
static struct nf_conntrack_tuple_hash *
____nf_conntrack_find(struct net *net, const struct nf_conntrack_zone *zone,
const struct nf_conntrack_tuple *tuple, u32 hash)
{
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_head *ct_hash;
struct hlist_nulls_node *n;
unsigned int bucket, hsize;
begin:
nf_conntrack_get_ht(&ct_hash, &hsize);
bucket = reciprocal_scale(hash, hsize);
hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) {
struct nf_conn *ct;
ct = nf_ct_tuplehash_to_ctrack(h);
if (nf_ct_is_expired(ct)) {
nf_ct_gc_expired(ct);
continue;
}
if (nf_ct_is_dying(ct))
continue;
if (nf_ct_key_equal(h, tuple, zone, net))
return h;
}
/*
* if the nulls value we got at the end of this lookup is
* not the expected one, we must restart lookup.
* We probably met an item that was moved to another chain.
*/
if (get_nulls_value(n) != bucket) {
NF_CT_STAT_INC_ATOMIC(net, search_restart);
goto begin;
}
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 56 | 35.67% | 4 | 26.67% |
Martin Josefsson | 33 | 21.02% | 1 | 6.67% |
Eric Dumazet | 15 | 9.55% | 1 | 6.67% |
Patrick McHardy | 9 | 5.73% | 2 | 13.33% |
Liping Zhang | 9 | 5.73% | 1 | 6.67% |
Changli Gao | 8 | 5.10% | 1 | 6.67% |
Jesper Dangaard Brouer | 8 | 5.10% | 1 | 6.67% |
Yasuyuki Kozakai | 6 | 3.82% | 1 | 6.67% |
Alexey Dobriyan | 5 | 3.18% | 1 | 6.67% |
Daniel Borkmann | 4 | 2.55% | 1 | 6.67% |
Andrey Vagin | 4 | 2.55% | 1 | 6.67% |
Total | 157 | 100.00% | 15 | 100.00% |
/* Find a connection corresponding to a tuple. */
static struct nf_conntrack_tuple_hash *
__nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone,
const struct nf_conntrack_tuple *tuple, u32 hash)
{
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct;
rcu_read_lock();
begin:
h = ____nf_conntrack_find(net, zone, tuple, hash);
if (h) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (unlikely(nf_ct_is_dying(ct) ||
!atomic_inc_not_zero(&ct->ct_general.use)))
h = NULL;
else {
if (unlikely(!nf_ct_key_equal(h, tuple, zone, net))) {
nf_ct_put(ct);
goto begin;
}
}
}
rcu_read_unlock();
return h;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 38 | 29.23% | 3 | 27.27% |
Martin Josefsson | 30 | 23.08% | 1 | 9.09% |
Eric Dumazet | 25 | 19.23% | 1 | 9.09% |
Yasuyuki Kozakai | 12 | 9.23% | 1 | 9.09% |
Changli Gao | 8 | 6.15% | 1 | 9.09% |
Alexey Dobriyan | 7 | 5.38% | 1 | 9.09% |
Andrey Vagin | 4 | 3.08% | 1 | 9.09% |
Daniel Borkmann | 4 | 3.08% | 1 | 9.09% |
Florian Westphal | 2 | 1.54% | 1 | 9.09% |
Total | 130 | 100.00% | 11 | 100.00% |
struct nf_conntrack_tuple_hash *
nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone,
const struct nf_conntrack_tuple *tuple)
{
return __nf_conntrack_find_get(net, zone, tuple,
hash_conntrack_raw(tuple, net));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Changli Gao | 35 | 85.37% | 1 | 33.33% |
Daniel Borkmann | 4 | 9.76% | 1 | 33.33% |
Florian Westphal | 2 | 4.88% | 1 | 33.33% |
Total | 41 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
static void __nf_conntrack_hash_insert(struct nf_conn *ct,
unsigned int hash,
unsigned int reply_hash)
{
hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
&nf_conntrack_hash[hash]);
hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode,
&nf_conntrack_hash[reply_hash]);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Martin Josefsson | 30 | 52.63% | 1 | 20.00% |
Yasuyuki Kozakai | 19 | 33.33% | 1 | 20.00% |
Eric Dumazet | 4 | 7.02% | 1 | 20.00% |
Florian Westphal | 2 | 3.51% | 1 | 20.00% |
Jesper Dangaard Brouer | 2 | 3.51% | 1 | 20.00% |
Total | 57 | 100.00% | 5 | 100.00% |
int
nf_conntrack_hash_check_insert(struct nf_conn *ct)
{
const struct nf_conntrack_zone *zone;
struct net *net = nf_ct_net(ct);
unsigned int hash, reply_hash;
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_node *n;
unsigned int sequence;
zone = nf_ct_zone(ct);
local_bh_disable();
do {
sequence = read_seqcount_begin(&nf_conntrack_generation);
hash = hash_conntrack(net,
&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
reply_hash = hash_conntrack(net,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
} while (nf_conntrack_double_lock(net, hash, reply_hash, sequence));
/* See if there's one in the list already, including reverse */
hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode)
if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
zone, net))
goto out;
hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode)
if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
zone, net))
goto out;
smp_wmb();
/* The caller holds a reference to this object */
atomic_set(&ct->ct_general.use, 2);
__nf_conntrack_hash_insert(ct, hash, reply_hash);
nf_conntrack_double_unlock(hash, reply_hash);
NF_CT_STAT_INC(net, insert);
local_bh_enable();
return 0;
out:
nf_conntrack_double_unlock(hash, reply_hash);
NF_CT_STAT_INC(net, insert_failed);
local_bh_enable();
return -EEXIST;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jozsef Kadlecsik | 101 | 40.08% | 1 | 7.69% |
Jesper Dangaard Brouer | 50 | 19.84% | 2 | 15.38% |
Martin Josefsson | 33 | 13.10% | 1 | 7.69% |
Patrick McHardy | 21 | 8.33% | 2 | 15.38% |
Yasuyuki Kozakai | 17 | 6.75% | 1 | 7.69% |
Florian Westphal | 13 | 5.16% | 4 | 30.77% |
Pablo Neira Ayuso | 9 | 3.57% | 1 | 7.69% |
Daniel Borkmann | 8 | 3.17% | 1 | 7.69% |
Total | 252 | 100.00% | 13 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert);
static inline void nf_ct_acct_update(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int len)
{
struct nf_conn_acct *acct;
acct = nf_conn_acct_find(ct);
if (acct) {
struct nf_conn_counter *counter = acct->counter;
atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets);
atomic64_add(len, &counter[CTINFO2DIR(ctinfo)].bytes);
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 77 | 100.00% | 1 | 100.00% |
Total | 77 | 100.00% | 1 | 100.00% |
static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
const struct nf_conn *loser_ct)
{
struct nf_conn_acct *acct;
acct = nf_conn_acct_find(loser_ct);
if (acct) {
struct nf_conn_counter *counter = acct->counter;
unsigned int bytes;
/* u32 should be fine since we must have seen one packet. */
bytes = atomic64_read(&counter[CTINFO2DIR(ctinfo)].bytes);
nf_ct_acct_update(ct, ctinfo, bytes);
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 78 | 100.00% | 1 | 100.00% |
Total | 78 | 100.00% | 1 | 100.00% |
/* Resolve race on insertion if this protocol allows this. */
static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
struct nf_conntrack_tuple_hash *h)
{
/* This is the conntrack entry already in hashes that won race. */
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
const struct nf_conntrack_l4proto *l4proto;
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
if (l4proto->allow_clash &&
((ct->status & IPS_NAT_DONE_MASK) == 0) &&
!nf_ct_is_dying(ct) &&
atomic_inc_not_zero(&ct->ct_general.use)) {
enum ip_conntrack_info oldinfo;
struct nf_conn *loser_ct = nf_ct_get(skb, &oldinfo);
nf_ct_acct_merge(ct, ctinfo, loser_ct);
nf_conntrack_put(&loser_ct->ct_general);
nf_ct_set(skb, ct, oldinfo);
return NF_ACCEPT;
}
NF_CT_STAT_INC(net, drop);
return NF_DROP;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 111 | 74.50% | 2 | 33.33% |
Florian Westphal | 38 | 25.50% | 4 | 66.67% |
Total | 149 | 100.00% | 6 | 100.00% |
/* Confirm a connection given skb; places it in hash table */
int
__nf_conntrack_confirm(struct sk_buff *skb)
{
const struct nf_conntrack_zone *zone;
unsigned int hash, reply_hash;
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct;
struct nf_conn_help *help;
struct nf_conn_tstamp *tstamp;
struct hlist_nulls_node *n;
enum ip_conntrack_info ctinfo;
struct net *net;
unsigned int sequence;
int ret = NF_DROP;
ct = nf_ct_get(skb, &ctinfo);
net = nf_ct_net(ct);
/* ipt_REJECT uses nf_conntrack_attach to attach related
ICMP/TCP RST packets in other direction. Actual packet
which created connection will be IP_CT_NEW or for an
expected connection, IP_CT_RELATED. */
if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
return NF_ACCEPT;
zone = nf_ct_zone(ct);
local_bh_disable();
do {
sequence = read_seqcount_begin(&nf_conntrack_generation);
/* reuse the hash saved before */
hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev;
hash = scale_hash(hash);
reply_hash = hash_conntrack(net,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
} while (nf_conntrack_double_lock(net, hash, reply_hash, sequence));
/* We're not in hash table, and we refuse to set up related
* connections for unconfirmed conns. But packet copies and
* REJECT will give spurious warnings here.
*/
/* No external references means no one else could have
* confirmed us.
*/
WARN_ON(nf_ct_is_confirmed(ct));
pr_debug("Confirming conntrack %p\n", ct);
/* We have to check the DYING flag after unlink to prevent
* a race against nf_ct_get_next_corpse() possibly called from
* user context, else we insert an already 'dead' hash, blocking
* further use of that particular connection -JM.
*/
nf_ct_del_from_dying_or_unconfirmed_list(ct);
if (unlikely(nf_ct_is_dying(ct))) {
nf_ct_add_to_dying_list(ct);
goto dying;
}
/* See if there's one in the list already, including reverse:
NAT could have grabbed it without realizing, since we're
not in the hash. If there is, we lost race. */
hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode)
if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
zone, net))
goto out;
hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode)
if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
zone, net))
goto out;
/* Timer relative to confirmation time, not original
setting time, otherwise we'd get timer wrap in
weird delay cases. */
ct->timeout += nfct_time_stamp;
atomic_inc(&ct->ct_general.use);
ct->status |= IPS_CONFIRMED;
/* set conntrack timestamp, if enabled. */
tstamp = nf_conn_tstamp_find(ct);
if (tstamp) {
if (skb->tstamp == 0)
__net_timestamp(skb);
tstamp->start = ktime_to_ns(skb->tstamp);
}
/* Since the lookup is lockless, hash insertion must be done after
* starting the timer and setting the CONFIRMED bit. The RCU barriers
* guarantee that no other CPU can find the conntrack before the above
* stores are visible.
*/
__nf_conntrack_hash_insert(ct, hash, reply_hash);
nf_conntrack_double_unlock(hash, reply_hash);
local_bh_enable();
help = nfct_help(ct);
if (help && help->helper)
nf_conntrack_event_cache(IPCT_HELPER, ct);
nf_conntrack_event_cache(master_ct(ct) ?
IPCT_RELATED : IPCT_NEW, ct);
return NF_ACCEPT;
out:
nf_ct_add_to_dying_list(ct);
ret = nf_ct_resolve_clash(net, skb, ctinfo, h);
dying:
nf_conntrack_double_unlock(hash, reply_hash);
NF_CT_STAT_INC(net, insert_failed);
local_bh_enable();
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 109 | 24.28% | 4 | 13.33% |
Martin Josefsson | 93 | 20.71% | 1 | 3.33% |
Yasuyuki Kozakai | 69 | 15.37% | 1 | 3.33% |
Jesper Dangaard Brouer | 55 | 12.25% | 2 | 6.67% |
Patrick McHardy | 38 | 8.46% | 6 | 20.00% |
Changli Gao | 18 | 4.01% | 2 | 6.67% |
Alexey Dobriyan | 16 | 3.56% | 3 | 10.00% |
Florian Westphal | 15 | 3.34% | 5 | 16.67% |
Harald Welte | 10 | 2.23% | 1 | 3.33% |
Joerg Marx | 10 | 2.23% | 1 | 3.33% |
Daniel Borkmann | 8 | 1.78% | 1 | 3.33% |
Eric Dumazet | 5 | 1.11% | 1 | 3.33% |
Herbert Xu | 2 | 0.45% | 1 | 3.33% |
Varsha Rao | 1 | 0.22% | 1 | 3.33% |
Total | 449 | 100.00% | 30 | 100.00% |
EXPORT_SYMBOL_GPL(__nf_conntrack_confirm);
/* Returns true if a connection correspondings to the tuple (required
for NAT). */
int
nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
const struct nf_conn *ignored_conntrack)
{
struct net *net = nf_ct_net(ignored_conntrack);
const struct nf_conntrack_zone *zone;
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_head *ct_hash;
unsigned int hash, hsize;
struct hlist_nulls_node *n;
struct nf_conn *ct;
zone = nf_ct_zone(ignored_conntrack);
rcu_read_lock();
begin:
nf_conntrack_get_ht(&ct_hash, &hsize);
hash = __hash_conntrack(net, tuple, hsize);
hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (ct == ignored_conntrack)
continue;
if (nf_ct_is_expired(ct)) {
nf_ct_gc_expired(ct);
continue;
}
if (nf_ct_key_equal(h, tuple, zone, net)) {
NF_CT_STAT_INC_ATOMIC(net, found);
rcu_read_unlock();
return 1;
}
}
if (get_nulls_value(n) != hash) {
NF_CT_STAT_INC_ATOMIC(net, search_restart);
goto begin;
}
rcu_read_unlock();
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 70 | 37.43% | 6 | 37.50% |
Patrick McHardy | 53 | 28.34% | 4 | 25.00% |
Yasuyuki Kozakai | 29 | 15.51% | 1 | 6.25% |
Alexey Dobriyan | 12 | 6.42% | 2 | 12.50% |
Daniel Borkmann | 11 | 5.88% | 1 | 6.25% |
Liping Zhang | 9 | 4.81% | 1 | 6.25% |
Eric Dumazet | 3 | 1.60% | 1 | 6.25% |
Total | 187 | 100.00% | 16 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken);
#define NF_CT_EVICTION_RANGE 8
/* There's a small race here where we may free a just-assured
connection. Too bad: we're in trouble anyway. */
static unsigned int early_drop_list(struct net *net,
struct hlist_nulls_head *head)
{
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_node *n;
unsigned int drops = 0;
struct nf_conn *tmp;
hlist_nulls_for_each_entry_rcu(h, n, head, hnnode) {
tmp = nf_ct_tuplehash_to_ctrack(h);
if (nf_ct_is_expired(tmp)) {
nf_ct_gc_expired(tmp);
continue;
}
if (test_bit(IPS_ASSURED_BIT, &tmp->status) ||
!net_eq(nf_ct_net(tmp), net) ||
nf_ct_is_dying(tmp))
continue;
if (!atomic_inc_not_zero(&tmp->ct_general.use))
continue;
/* kill only if still in same netns -- might have moved due to
* SLAB_TYPESAFE_BY_RCU rules.
*
* We steal the timer reference. If that fails timer has
* already fired or someone else deleted it. Just drop ref
* and move to next entry.
*/
if (net_eq(nf_ct_net(tmp), net) &&
nf_ct_is_confirmed(tmp) &&
nf_ct_delete(tmp, 0, 0))
drops++;
nf_ct_put(tmp);
}
return drops;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 80 | 52.29% | 4 | 25.00% |
Patrick McHardy | 36 | 23.53% | 5 | 31.25% |
Yasuyuki Kozakai | 21 | 13.73% | 1 | 6.25% |
Alexey Dobriyan | 5 | 3.27% | 1 | 6.25% |
Eric Dumazet | 3 | 1.96% | 1 | 6.25% |
Pablo Neira Ayuso | 3 | 1.96% | 1 | 6.25% |
Jesper Dangaard Brouer | 3 | 1.96% | 1 | 6.25% |
Changli Gao | 1 | 0.65% | 1 | 6.25% |
Paul E. McKenney | 1 | 0.65% | 1 | 6.25% |
Total | 153 | 100.00% | 16 | 100.00% |
static noinline int early_drop(struct net *net, unsigned int _hash)
{
unsigned int i;
for (i = 0; i < NF_CT_EVICTION_RANGE; i++) {
struct hlist_nulls_head *ct_hash;
unsigned int hash, hsize, drops;
rcu_read_lock();
nf_conntrack_get_ht(&ct_hash, &hsize);
hash = reciprocal_scale(_hash++, hsize);
drops = early_drop_list(net, &ct_hash[hash]);
rcu_read_unlock();
if (drops) {
NF_CT_STAT_ADD_ATOMIC(net, early_drop, drops);
return true;
}
}
return false;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 83 | 77.57% | 2 | 40.00% |
Liping Zhang | 16 | 14.95% | 2 | 40.00% |
Yasuyuki Kozakai | 8 | 7.48% | 1 | 20.00% |
Total | 107 | 100.00% | 5 | 100.00% |
static bool gc_worker_skip_ct(const struct nf_conn *ct)
{
return !nf_ct_is_confirmed(ct) || nf_ct_is_dying(ct);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 24 | 100.00% | 1 | 100.00% |
Total | 24 | 100.00% | 1 | 100.00% |
static bool gc_worker_can_early_drop(const struct nf_conn *ct)
{
const struct nf_conntrack_l4proto *l4proto;
if (!test_bit(IPS_ASSURED_BIT, &ct->status))
return true;
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
if (l4proto->can_early_drop && l4proto->can_early_drop(ct))
return true;
return false;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 68 | 100.00% | 1 | 100.00% |
Total | 68 | 100.00% | 1 | 100.00% |
static void gc_worker(struct work_struct *work)
{
unsigned int min_interval = max(HZ / GC_MAX_BUCKETS_DIV, 1u);
unsigned int i, goal, buckets = 0, expired_count = 0;
unsigned int nf_conntrack_max95 = 0;
struct conntrack_gc_work *gc_work;
unsigned int ratio, scanned = 0;
unsigned long next_run;
gc_work = container_of(work, struct conntrack_gc_work, dwork.work);
goal = nf_conntrack_htable_size / GC_MAX_BUCKETS_DIV;
i = gc_work->last_bucket;
if (gc_work->early_drop)
nf_conntrack_max95 = nf_conntrack_max / 100u * 95u;
do {
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_head *ct_hash;
struct hlist_nulls_node *n;
unsigned int hashsz;
struct nf_conn *tmp;
i++;
rcu_read_lock();
nf_conntrack_get_ht(&ct_hash, &hashsz);
if (i >= hashsz)
i = 0;
hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[i], hnnode) {
struct net *net;
tmp = nf_ct_tuplehash_to_ctrack(h);
scanned++;
if (nf_ct_is_expired(tmp)) {
nf_ct_gc_expired(tmp);
expired_count++;
continue;
}
if (nf_conntrack_max95 == 0 || gc_worker_skip_ct(tmp))
continue;
net = nf_ct_net(tmp);
if (atomic_read(&net->ct.count) < nf_conntrack_max95)
continue;
/* need to take reference to avoid possible races */
if (!atomic_inc_not_zero(&tmp->ct_general.use))
continue;
if (gc_worker_skip_ct(tmp)) {
nf_ct_put(tmp);
continue;
}
if (gc_worker_can_early_drop(tmp))
nf_ct_kill(tmp);
nf_ct_put(tmp);
}
/* could check get_nulls_value() here and restart if ct
* was moved to another chain. But given gc is best-effort
* we will just continue with next hash slot.
*/
rcu_read_unlock();
cond_resched_rcu_qs();
} while (++buckets < goal);
if (gc_work->exiting)
return;
/*
* Eviction will normally happen from the packet path, and not
* from this gc worker.
*
* This worker is only here to reap expired entries when system went
* idle after a busy period.
*
* The heuristics below are supposed to balance conflicting goals:
*
* 1. Minimize time until we notice a stale entry
* 2. Maximize scan intervals to not waste cycles
*
* Normally, expire ratio will be close to 0.
*
* As soon as a sizeable fraction of the entries have expired
* increase scan frequency.
*/
ratio = scanned ? expired_count * 100 / scanned : 0;
if (ratio > GC_EVICT_RATIO) {
gc_work->next_gc_run = min_interval;
} else {
unsigned int max = GC_MAX_SCAN_JIFFIES / GC_MAX_BUCKETS_DIV;
BUILD_BUG_ON((GC_MAX_SCAN_JIFFIES / GC_MAX_BUCKETS_DIV) == 0);
gc_work->next_gc_run += min_interval;
if (gc_work->next_gc_run > max)
gc_work->next_gc_run = max;
}
next_run = gc_work->next_gc_run;
gc_work->last_bucket = i;
gc_work->early_drop = false;
queue_delayed_work(system_long_wq, &gc_work->dwork, next_run);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 400 | 100.00% | 5 | 100.00% |
Total | 400 | 100.00% | 5 | 100.00% |
static void conntrack_gc_work_init(struct conntrack_gc_work *gc_work)
{
INIT_DEFERRABLE_WORK(&gc_work->dwork, gc_worker);
gc_work->next_gc_run = HZ;
gc_work->exiting = false;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 32 | 96.97% | 3 | 75.00% |
Subash Abhinov Kasiviswanathan | 1 | 3.03% | 1 | 25.00% |
Total | 33 | 100.00% | 4 | 100.00% |
static struct nf_conn *
__nf_conntrack_alloc(struct net *net,
const struct nf_conntrack_zone *zone,
const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_tuple *repl,
gfp_t gfp, u32 hash)
{
struct nf_conn *ct;
/* We don't want any race condition at early drop stage */
atomic_inc(&net->ct.count);
if (nf_conntrack_max &&
unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) {
if (!early_drop(net, hash)) {
if (!conntrack_gc_work.early_drop)
conntrack_gc_work.early_drop = true;
atomic_dec(&net->ct.count);
net_warn_ratelimited("nf_conntrack: table full, dropping packet\n");
return ERR_PTR(-ENOMEM);
}
}
/*
* Do not use kmem_cache_zalloc(), as this cache uses
* SLAB_TYPESAFE_BY_RCU.
*/
ct = kmem_cache_alloc(nf_conntrack_cachep, gfp);
if (ct == NULL)
goto out;
spin_lock_init(&ct->lock);
ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL;
ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
/* save hash for reusing when confirming */
*(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash;
ct->status = 0;
write_pnet(&ct->ct_net, net);
memset(&ct->__nfct_init_offset[0], 0,
offsetof(struct nf_conn, proto) -
offsetof(struct nf_conn, __nfct_init_offset[0]));
nf_ct_zone_add(ct, zone);
/* Because we use RCU lookups, we set ct_general.use to zero before
* this is inserted in any list.
*/
atomic_set(&ct->ct_general.use, 0);
return ct;
out:
atomic_dec(&net->ct.count);
return ERR_PTR(-ENOMEM);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 94 | 31.54% | 2 | 9.52% |
Florian Westphal | 52 | 17.45% | 3 | 14.29% |
Eric Dumazet | 44 | 14.77% | 2 | 9.52% |
Patrick McHardy | 30 | 10.07% | 3 | 14.29% |
Alexey Dobriyan | 27 | 9.06% | 3 | 14.29% |
Pablo Neira Ayuso | 18 | 6.04% | 3 | 14.29% |
Changli Gao | 16 | 5.37% | 1 | 4.76% |
Daniel Borkmann | 14 | 4.70% | 2 | 9.52% |
Joe Perches | 2 | 0.67% | 1 | 4.76% |
Paul E. McKenney | 1 | 0.34% | 1 | 4.76% |
Total | 298 | 100.00% | 21 | 100.00% |
struct nf_conn *nf_conntrack_alloc(struct net *net,
const struct nf_conntrack_zone *zone,
const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_tuple *repl,
gfp_t gfp)
{
return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Changli Gao | 45 | 91.84% | 1 | 50.00% |
Daniel Borkmann | 4 | 8.16% | 1 | 50.00% |
Total | 49 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_alloc);
void nf_conntrack_free(struct nf_conn *ct)
{
struct net *net = nf_ct_net(ct);
/* A freed object has refcnt == 0, that's
* the golden rule for SLAB_TYPESAFE_BY_RCU
*/
WARN_ON(atomic_read(&ct->ct_general.use) != 0);
nf_ct_ext_destroy(ct);
nf_ct_ext_free(ct);
kmem_cache_free(nf_conntrack_cachep, ct);
smp_mb__before_atomic();
atomic_dec(&net->ct.count);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 25 | 37.88% | 2 | 20.00% |
Patrick McHardy | 20 | 30.30% | 3 | 30.00% |
Eric Dumazet | 17 | 25.76% | 2 | 20.00% |
Varsha Rao | 2 | 3.03% | 1 | 10.00% |
Paul E. McKenney | 1 | 1.52% | 1 | 10.00% |
Peter Zijlstra | 1 | 1.52% | 1 | 10.00% |
Total | 66 | 100.00% | 10 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_free);
/* Allocate a new conntrack: we return -ENOMEM if classification
failed due to stress. Otherwise it really is unclassifiable. */
static noinline struct nf_conntrack_tuple_hash *
init_conntrack(struct net *net, struct nf_conn *tmpl,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto,
struct sk_buff *skb,
unsigned int dataoff, u32 hash)
{
struct nf_conn *ct;
struct nf_conn_help *help;
struct nf_conntrack_tuple repl_tuple;
struct nf_conntrack_ecache *ecache;
struct nf_conntrack_expect *exp = NULL;
const struct nf_conntrack_zone *zone;
struct nf_conn_timeout *timeout_ext;
struct nf_conntrack_zone tmp;
unsigned int *timeouts;
if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) {
pr_debug("Can't invert tuple.\n");
return NULL;
}
zone = nf_ct_zone_tmpl(tmpl, skb, &tmp);
ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC,
hash);
if (IS_ERR(ct))
return (struct nf_conntrack_tuple_hash *)ct;
if (!nf_ct_add_synproxy(ct, tmpl)) {
nf_conntrack_free(ct);
return ERR_PTR(-ENOMEM);
}
timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL;
if (timeout_ext) {
timeouts = nf_ct_timeout_data(timeout_ext);
if (unlikely(!timeouts))
timeouts = l4proto->get_timeouts(net);
} else {
timeouts = l4proto->get_timeouts(net);
}
if (!l4proto->new(ct, skb, dataoff, timeouts)) {
nf_conntrack_free(ct);
pr_debug("can't track with proto module\n");
return NULL;
}
if (timeout_ext)
nf_ct_timeout_ext_add(ct, rcu_dereference(timeout_ext->timeout),
GFP_ATOMIC);
nf_ct_acct_ext_add(ct, GFP_ATOMIC);
nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
nf_ct_labels_ext_add(ct);
ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL;
nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0,
ecache ? ecache->expmask : 0,
GFP_ATOMIC);
local_bh_disable();
if (net->ct.expect_count) {
spin_lock(&nf_conntrack_expect_lock);
exp = nf_ct_find_expectation(net, zone, tuple);
if (exp) {
pr_debug("expectation arrives ct=%p exp=%p\n",
ct, exp);
/* Welcome, Mr. Bond. We've been expecting you... */
__set_bit(IPS_EXPECTED_BIT, &ct->status);
/* exp->master safe, refcnt bumped in nf_ct_find_expectation */
ct->master = exp->master;
if (exp->helper) {
help = nf_ct_helper_ext_add(ct, exp->helper,
GFP_ATOMIC);
if (help)
rcu_assign_pointer(help->helper, exp->helper);
}
#ifdef CONFIG_NF_CONNTRACK_MARK
ct->mark = exp->master->mark;
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
ct->secmark = exp->master->secmark;
#endif
NF_CT_STAT_INC(net, expect_new);
}
spin_unlock(&nf_conntrack_expect_lock);
}
if (!exp)
__nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC);
/* Now it is inserted into the unconfirmed list, bump refcount */
nf_conntrack_get(&ct->ct_general);
nf_ct_add_to_unconfirmed_list(ct);
local_bh_enable();
if (exp) {
if (exp->expectfn)
exp->expectfn(ct, exp);
nf_ct_expect_put(exp);
}
return &ct->tuplehash[IP_CT_DIR_ORIGINAL];
}
/* On success, returns 0, sets skb->_nfct | ctinfo */
static int
resolve_normal_ct(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
u_int16_t l3num,
u_int8_t protonum,
const struct nf_conntrack_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto)
{
const struct nf_conntrack_zone *zone;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_tuple_hash *h;
enum ip_conntrack_info ctinfo;
struct nf_conntrack_zone tmp;
struct nf_conn *ct;
u32 hash;
if (!nf_ct_get_tuple(skb, skb_network_offset(skb),
dataoff, l3num, protonum, net, &tuple, l3proto,
l4proto)) {
pr_debug("Can't get tuple\n");
return 0;
}
/* look for tuple match */
zone = nf_ct_zone_tmpl(tmpl, skb, &tmp);
hash = hash_conntrack_raw(&tuple, net);
h = __nf_conntrack_find_get(net, zone, &tuple, hash);
if (!h) {
h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto,
skb, dataoff, hash);
if (!h)
return 0;
if (IS_ERR(h))
return PTR_ERR(h);
}
ct = nf_ct_tuplehash_to_ctrack(h);
/* It exists; we have (non-exclusive) reference. */
if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) {
ctinfo = IP_CT_ESTABLISHED_REPLY;
} else {
/* Once we've had two way comms, always ESTABLISHED. */
if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
pr_debug("normal packet for %p\n", ct);
ctinfo = IP_CT_ESTABLISHED;
} else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) {
pr_debug("related packet for %p\n", ct);
ctinfo = IP_CT_RELATED;
} else {
pr_debug("new packet for %p\n", ct);
ctinfo = IP_CT_NEW;
}
}
nf_ct_set(skb, ct, ctinfo);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 208 | 68.65% | 1 | 5.26% |
Daniel Borkmann | 22 | 7.26% | 2 | 10.53% |
Florian Westphal | 19 | 6.27% | 3 | 15.79% |
Changli Gao | 16 | 5.28% | 1 | 5.26% |
Patrick McHardy | 13 | 4.29% | 3 | 15.79% |
Alexey Dobriyan | 11 | 3.63% | 3 | 15.79% |
Weongyo Jeong | 4 | 1.32% | 1 | 5.26% |
Martin Josefsson | 4 | 1.32% | 1 | 5.26% |
Julia Lawall | 2 | 0.66% | 1 | 5.26% |
Eric W. Biedermann | 2 | 0.66% | 1 | 5.26% |
Arnaldo Carvalho de Melo | 1 | 0.33% | 1 | 5.26% |
Eric Dumazet | 1 | 0.33% | 1 | 5.26% |
Total | 303 | 100.00% | 19 | 100.00% |
unsigned int
nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
struct sk_buff *skb)
{
const struct nf_conntrack_l3proto *l3proto;
const struct nf_conntrack_l4proto *l4proto;
struct nf_conn *ct, *tmpl;
enum ip_conntrack_info ctinfo;
unsigned int *timeouts;
unsigned int dataoff;
u_int8_t protonum;
int ret;
tmpl = nf_ct_get(skb, &ctinfo);
if (tmpl || ctinfo == IP_CT_UNTRACKED) {
/* Previously seen (loopback or untracked)? Ignore. */
if ((tmpl && !nf_ct_is_template(tmpl)) ||
ctinfo == IP_CT_UNTRACKED) {
NF_CT_STAT_INC_ATOMIC(net, ignore);
return NF_ACCEPT;
}
skb->_nfct = 0;
}
/* rcu_read_lock()ed by nf_hook_thresh */
l3proto = __nf_ct_l3proto_find(pf);
ret = l3proto->get_l4proto(skb, skb_network_offset(skb),
&dataoff, &protonum);
if (ret <= 0) {
pr_debug("not prepared to track yet or error occurred\n");
NF_CT_STAT_INC_ATOMIC(net, error);
NF_CT_STAT_INC_ATOMIC(net, invalid);
ret = -ret;
goto out;
}
l4proto = __nf_ct_l4proto_find(pf, protonum);
/* It may be an special packet, error, unclean...
* inverse of the return code tells to the netfilter
* core what to do with the packet. */
if (l4proto->error != NULL) {
ret = l4proto->error(net, tmpl, skb, dataoff, pf, hooknum);
if (ret <= 0) {
NF_CT_STAT_INC_ATOMIC(net, error);
NF_CT_STAT_INC_ATOMIC(net, invalid);
ret = -ret;
goto out;
}
/* ICMP[v6] protocol trackers may assign one conntrack. */
if (skb->_nfct)
goto out;
}
repeat:
ret = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum,
l3proto, l4proto);
if (ret < 0) {
/* Too stressed to deal. */
NF_CT_STAT_INC_ATOMIC(net, drop);
ret = NF_DROP;
goto out;
}
ct = nf_ct_get(skb, &ctinfo);
if (!ct) {
/* Not valid part of a connection */
NF_CT_STAT_INC_ATOMIC(net, invalid);
ret = NF_ACCEPT;
goto out;
}
/* Decide what timeout policy we want to apply to this flow. */
timeouts = nf_ct_timeout_lookup(net, ct, l4proto);
ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, timeouts);
if (ret <= 0) {
/* Invalid: inverse of the return code tells
* the netfilter core what to do */
pr_debug("nf_conntrack_in: Can't track with proto module\n");
nf_conntrack_put(&ct->ct_general);
skb->_nfct = 0;
NF_CT_STAT_INC_ATOMIC(net, invalid);
if (ret == -NF_DROP)
NF_CT_STAT_INC_ATOMIC(net, drop);
/* Special case: TCP tracker reports an attempt to reopen a
* closed/aborted connection. We have to go back and create a
* fresh conntrack.
*/
if (ret == -NF_REPEAT)
goto repeat;
ret = -ret;
goto out;
}
if (ctinfo == IP_CT_ESTABLISHED_REPLY &&
!test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status))
nf_conntrack_event_cache(IPCT_REPLY, ct);
out:
if (tmpl)
nf_ct_put(tmpl);
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 230 | 48.52% | 3 | 9.68% |
Patrick McHardy | 72 | 15.19% | 5 | 16.13% |
Florian Westphal | 67 | 14.14% | 5 | 16.13% |
Pablo Neira Ayuso | 44 | 9.28% | 7 | 22.58% |
Alexey Dobriyan | 33 | 6.96% | 4 | 12.90% |
Arnd Bergmann | 11 | 2.32% | 1 | 3.23% |
Herbert Xu | 7 | 1.48% | 1 | 3.23% |
Martin Josefsson | 6 | 1.27% | 1 | 3.23% |
Lucas De Marchi | 1 | 0.21% | 1 | 3.23% |
Christoph Paasch | 1 | 0.21% | 1 | 3.23% |
Jan Engelhardt | 1 | 0.21% | 1 | 3.23% |
Aaron Conole | 1 | 0.21% | 1 | 3.23% |
Total | 474 | 100.00% | 31 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_in);
bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig)
{
bool ret;
rcu_read_lock();
ret = nf_ct_invert_tuple(inverse, orig,
__nf_ct_l3proto_find(orig->src.l3num),
__nf_ct_l4proto_find(orig->src.l3num,
orig->dst.protonum));
rcu_read_unlock();
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 44 | 72.13% | 1 | 20.00% |
Patrick McHardy | 13 | 21.31% | 1 | 20.00% |
Jan Engelhardt | 2 | 3.28% | 1 | 20.00% |
Pablo Neira Ayuso | 1 | 1.64% | 1 | 20.00% |
Martin Josefsson | 1 | 1.64% | 1 | 20.00% |
Total | 61 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr);
/* Alter reply tuple (maybe alter helper). This is for NAT, and is
implicitly racy: see __nf_conntrack_confirm */
void nf_conntrack_alter_reply(struct nf_conn *ct,
const struct nf_conntrack_tuple *newreply)
{
struct nf_conn_help *help = nfct_help(ct);
/* Should be unconfirmed, so not in hash table yet */
WARN_ON(nf_ct_is_confirmed(ct));
pr_debug("Altering reply tuple of %p to ", ct);
nf_ct_dump_tuple(newreply);
ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
if (ct->master || (help && !hlist_empty(&help->expectations)))
return;
rcu_read_lock();
__nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
rcu_read_unlock();
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jozsef Kadlecsik | 67 | 71.28% | 1 | 11.11% |
Patrick McHardy | 15 | 15.96% | 4 | 44.44% |
Yasuyuki Kozakai | 9 | 9.57% | 1 | 11.11% |
Varsha Rao | 1 | 1.06% | 1 | 11.11% |
Jan Engelhardt | 1 | 1.06% | 1 | 11.11% |
Pablo Neira Ayuso | 1 | 1.06% | 1 | 11.11% |
Total | 94 | 100.00% | 9 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply);
/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
void __nf_ct_refresh_acct(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
const struct sk_buff *skb,
unsigned long extra_jiffies,
int do_acct)
{
WARN_ON(!skb);
/* Only update if this is not a fixed timeout */
if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status))
goto acct;
/* If not in hash table, timer will not be active yet */
if (nf_ct_is_confirmed(ct))
extra_jiffies += nfct_time_stamp;
ct->timeout = extra_jiffies;
acct:
if (do_acct)
nf_ct_acct_update(ct, ctinfo, skb->len);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 50 | 59.52% | 1 | 11.11% |
Eric Leblond | 13 | 15.48% | 1 | 11.11% |
Patrick McHardy | 5 | 5.95% | 1 | 11.11% |
Florian Westphal | 4 | 4.76% | 1 | 11.11% |
Martin Josefsson | 3 | 3.57% | 1 | 11.11% |
Eric Dumazet | 3 | 3.57% | 1 | 11.11% |
Pablo Neira Ayuso | 3 | 3.57% | 1 | 11.11% |
Varsha Rao | 2 | 2.38% | 1 | 11.11% |
Krzysztof Piotr Oledzki | 1 | 1.19% | 1 | 11.11% |
Total | 84 | 100.00% | 9 | 100.00% |
EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct);
bool nf_ct_kill_acct(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
const struct sk_buff *skb)
{
nf_ct_acct_update(ct, ctinfo, skb->len);
return nf_ct_delete(ct, 0, 0);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Fabian Hugelshofer | 17 | 41.46% | 1 | 14.29% |
Patrick McHardy | 11 | 26.83% | 1 | 14.29% |
Florian Westphal | 7 | 17.07% | 2 | 28.57% |
Pablo Neira Ayuso | 3 | 7.32% | 1 | 14.29% |
David S. Miller | 2 | 4.88% | 1 | 14.29% |
Krzysztof Piotr Oledzki | 1 | 2.44% | 1 | 14.29% |
Total | 41 | 100.00% | 7 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_kill_acct);
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
#include <linux/mutex.h>
/* Generic function for tcp/udp/sctp/dccp and alike. This needs to be
* in ip_conntrack_core, since we don't want the protocols to autoload
* or depend on ctnetlink */
int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) ||
nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 53 | 82.81% | 1 | 25.00% |
David S. Miller | 9 | 14.06% | 1 | 25.00% |
Patrick McHardy | 2 | 3.12% | 2 | 50.00% |
Total | 64 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr);
const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = {
[CTA_PROTO_SRC_PORT] = { .type = NLA_U16 },
[CTA_PROTO_DST_PORT] = { .type = NLA_U16 },
};
EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy);
int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
struct nf_conntrack_tuple *t)
{
if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT])
return -EINVAL;
t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]);
t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 69 | 94.52% | 1 | 25.00% |
Patrick McHardy | 4 | 5.48% | 3 | 75.00% |
Total | 73 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple);
int nf_ct_port_nlattr_tuple_size(void)
{
return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Holger Eitzenberger | 17 | 100.00% | 1 | 100.00% |
Total | 17 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size);
#endif
/* Used by ipt_REJECT and ip6t_REJECT. */
static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb)
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
/* This ICMP is in reverse direction to the packet which caused it */
ct = nf_ct_get(skb, &ctinfo);
if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
ctinfo = IP_CT_RELATED_REPLY;
else
ctinfo = IP_CT_RELATED;
/* Attach to new skbuff, and increment count */
nf_ct_set(nskb, ct, ctinfo);
nf_conntrack_get(skb_nfct(nskb));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 61 | 83.56% | 1 | 16.67% |
Florian Westphal | 8 | 10.96% | 2 | 33.33% |
Patrick McHardy | 3 | 4.11% | 2 | 33.33% |
Eric Dumazet | 1 | 1.37% | 1 | 16.67% |
Total | 73 | 100.00% | 6 | 100.00% |
/* Bring out ya dead! */
static struct nf_conn *
get_next_corpse(int (*iter)(struct nf_conn *i, void *data),
void *data, unsigned int *bucket)
{
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct;
struct hlist_nulls_node *n;
spinlock_t *lockp;
for (; *bucket < nf_conntrack_htable_size; (*bucket)++) {
lockp = &nf_conntrack_locks[*bucket % CONNTRACK_LOCKS];
local_bh_disable();
nf_conntrack_lock(lockp);
if (*bucket < nf_conntrack_htable_size) {
hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnnode) {
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_ct_tuplehash_to_ctrack(h);
if (iter(ct, data))
goto found;
}
}
spin_unlock(lockp);
local_bh_enable();
cond_resched();
}
return NULL;
found:
atomic_inc(&ct->ct_general.use);
spin_unlock(lockp);
local_bh_enable();
return ct;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 59 | 33.91% | 1 | 9.09% |
Patrick McHardy | 40 | 22.99% | 3 | 27.27% |
Jesper Dangaard Brouer | 38 | 21.84% | 2 | 18.18% |
Florian Westphal | 33 | 18.97% | 3 | 27.27% |
Eric Dumazet | 3 | 1.72% | 1 | 9.09% |
Sasha Levin | 1 | 0.57% | 1 | 9.09% |
Total | 174 | 100.00% | 11 | 100.00% |
static void nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data),
void *data, u32 portid, int report)
{
unsigned int bucket = 0, sequence;
struct nf_conn *ct;
might_sleep();
for (;;) {
sequence = read_seqcount_begin(&nf_conntrack_generation);
while ((ct = get_next_corpse(iter, data, &bucket)) != NULL) {
/* Time to push up daises... */
nf_ct_delete(ct, portid, report);
nf_ct_put(ct);
cond_resched();
}
if (!read_seqcount_retry(&nf_conntrack_generation, sequence))
break;
bucket = 0;
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 117 | 100.00% | 2 | 100.00% |
Total | 117 | 100.00% | 2 | 100.00% |
struct iter_data {
int (*iter)(struct nf_conn *i, void *data);
void *data;
struct net *net;
};
static int iter_net_only(struct nf_conn *i, void *data)
{
struct iter_data *d = data;
if (!net_eq(d->net, nf_ct_net(i)))
return 0;
return d->iter(i, d->data);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 52 | 100.00% | 1 | 100.00% |
Total | 52 | 100.00% | 1 | 100.00% |
static void
__nf_ct_unconfirmed_destroy(struct net *net)
{
int cpu;
for_each_possible_cpu(cpu) {
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_node *n;
struct ct_pcpu *pcpu;
pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
spin_lock_bh(&pcpu->lock);
hlist_nulls_for_each_entry(h, n, &pcpu->unconfirmed, hnnode) {
struct nf_conn *ct;
ct = nf_ct_tuplehash_to_ctrack(h);
/* we cannot call iter() on unconfirmed list, the
* owning cpu can reallocate ct->ext at any time.
*/
set_bit(IPS_DYING_BIT, &ct->status);
}
spin_unlock_bh(&pcpu->lock);
cond_resched();
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 36 | 35.29% | 2 | 20.00% |
Jesper Dangaard Brouer | 32 | 31.37% | 1 | 10.00% |
Patrick McHardy | 22 | 21.57% | 4 | 40.00% |
Yasuyuki Kozakai | 6 | 5.88% | 1 | 10.00% |
Martin Josefsson | 4 | 3.92% | 1 | 10.00% |
Eric Dumazet | 2 | 1.96% | 1 | 10.00% |
Total | 102 | 100.00% | 10 | 100.00% |
void nf_ct_unconfirmed_destroy(struct net *net)
{
might_sleep();
if (atomic_read(&net->ct.count) > 0) {
__nf_ct_unconfirmed_destroy(net);
nf_queue_nf_hook_drop(net);
synchronize_net();
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 42 | 100.00% | 2 | 100.00% |
Total | 42 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_unconfirmed_destroy);
void nf_ct_iterate_cleanup_net(struct net *net,
int (*iter)(struct nf_conn *i, void *data),
void *data, u32 portid, int report)
{
struct iter_data d;
might_sleep();
if (atomic_read(&net->ct.count) == 0)
return;
d.iter = iter;
d.data = data;
d.net = net;
nf_ct_iterate_cleanup(iter_net_only, &d, portid, report);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 53 | 60.23% | 5 | 71.43% |
Yasuyuki Kozakai | 29 | 32.95% | 1 | 14.29% |
Alexey Dobriyan | 6 | 6.82% | 1 | 14.29% |
Total | 88 | 100.00% | 7 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup_net);
/**
* nf_ct_iterate_destroy - destroy unconfirmed conntracks and iterate table
* @iter: callback to invoke for each conntrack
* @data: data to pass to @iter
*
* Like nf_ct_iterate_cleanup, but first marks conntracks on the
* unconfirmed list as dying (so they will not be inserted into
* main table).
*
* Can only be called in module exit path.
*/
void
nf_ct_iterate_destroy(int (*iter)(struct nf_conn *i, void *data), void *data)
{
struct net *net;
rtnl_lock();
for_each_net(net) {
if (atomic_read(&net->ct.count) == 0)
continue;
__nf_ct_unconfirmed_destroy(net);
nf_queue_nf_hook_drop(net);
}
rtnl_unlock();
/* Need to wait for netns cleanup worker to finish, if its
* running -- it might have deleted a net namespace from
* the global list, so our __nf_ct_unconfirmed_destroy() might
* not have affected all namespaces.
*/
net_ns_barrier();
/* a conntrack could have been unlinked from unconfirmed list
* before we grabbed pcpu lock in __nf_ct_unconfirmed_destroy().
* This makes sure its inserted into conntrack table.
*/
synchronize_net();
nf_ct_iterate_cleanup(iter, data, 0, 0);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 84 | 97.67% | 4 | 80.00% |
Yasuyuki Kozakai | 2 | 2.33% | 1 | 20.00% |
Total | 86 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_iterate_destroy);
static int kill_all(struct nf_conn *i, void *data)
{
return net_eq(nf_ct_net(i), data);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 17 | 65.38% | 1 | 50.00% |
Florian Westphal | 9 | 34.62% | 1 | 50.00% |
Total | 26 | 100.00% | 2 | 100.00% |
void nf_ct_free_hashtable(void *hash, unsigned int size)
{
if (is_vmalloc_addr(hash))
vfree(hash);
else
free_pages((unsigned long)hash,
get_order(sizeof(struct hlist_head) * size));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 38 | 82.61% | 1 | 16.67% |
Patrick McHardy | 6 | 13.04% | 3 | 50.00% |
Eric Dumazet | 1 | 2.17% | 1 | 16.67% |
Stephen Hemminger | 1 | 2.17% | 1 | 16.67% |
Total | 46 | 100.00% | 6 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_free_hashtable);
void nf_conntrack_cleanup_start(void)
{
conntrack_gc_work.exiting = true;
RCU_INIT_POINTER(ip_ct_attach, NULL);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Gao Feng | 14 | 70.00% | 1 | 50.00% |
Florian Westphal | 6 | 30.00% | 1 | 50.00% |
Total | 20 | 100.00% | 2 | 100.00% |
void nf_conntrack_cleanup_end(void)
{
RCU_INIT_POINTER(nf_ct_destroy, NULL);
cancel_delayed_work_sync(&conntrack_gc_work.dwork);
nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size);
nf_conntrack_proto_fini();
nf_conntrack_seqadj_fini();
nf_conntrack_labels_fini();
nf_conntrack_helper_fini();
nf_conntrack_timeout_fini();
nf_conntrack_ecache_fini();
nf_conntrack_tstamp_fini();
nf_conntrack_acct_fini();
nf_conntrack_expect_fini();
kmem_cache_destroy(nf_conntrack_cachep);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Gao Feng | 32 | 52.46% | 9 | 60.00% |
Florian Westphal | 20 | 32.79% | 3 | 20.00% |
Eric Dumazet | 5 | 8.20% | 1 | 6.67% |
Patrick McHardy | 3 | 4.92% | 1 | 6.67% |
Alexey Dobriyan | 1 | 1.64% | 1 | 6.67% |
Total | 61 | 100.00% | 15 | 100.00% |
/*
* Mishearing the voices in his head, our hero wonders how he's
* supposed to kill the mall.
*/
void nf_conntrack_cleanup_net(struct net *net)
{
LIST_HEAD(single);
list_add(&net->exit_list, &single);
nf_conntrack_cleanup_net_list(&single);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Vladimir Davydov | 23 | 71.88% | 1 | 25.00% |
Alexey Dobriyan | 5 | 15.62% | 2 | 50.00% |
Yasuyuki Kozakai | 4 | 12.50% | 1 | 25.00% |
Total | 32 | 100.00% | 4 | 100.00% |
void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list)
{
int busy;
struct net *net;
/*
* This makes sure all current packets have passed through
* netfilter framework. Roll on, two-stage module
* delete...
*/
synchronize_net();
i_see_dead_people:
busy = 0;
list_for_each_entry(net, net_exit_list, exit_list) {
nf_ct_iterate_cleanup(kill_all, net, 0, 0);
if (atomic_read(&net->ct.count) != 0)
busy = 1;
}
if (busy) {
schedule();
goto i_see_dead_people;
}
list_for_each_entry(net, net_exit_list, exit_list) {
nf_conntrack_proto_pernet_fini(net);
nf_conntrack_helper_pernet_fini(net);
nf_conntrack_ecache_pernet_fini(net);
nf_conntrack_tstamp_pernet_fini(net);
nf_conntrack_acct_pernet_fini(net);
nf_conntrack_expect_pernet_fini(net);
free_percpu(net->ct.stat);
free_percpu(net->ct.pcpu_lists);
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Vladimir Davydov | 49 | 35.77% | 1 | 4.00% |
Alexey Dobriyan | 23 | 16.79% | 6 | 24.00% |
Yasuyuki Kozakai | 21 | 15.33% | 2 | 8.00% |
Gao Feng | 14 | 10.22% | 7 | 28.00% |
Jesper Dangaard Brouer | 9 | 6.57% | 1 | 4.00% |
Florian Westphal | 6 | 4.38% | 2 | 8.00% |
Pablo Neira Ayuso | 6 | 4.38% | 3 | 12.00% |
Eric Leblond | 4 | 2.92% | 1 | 4.00% |
Stephen Hemminger | 4 | 2.92% | 1 | 4.00% |
KOVACS Krisztian | 1 | 0.73% | 1 | 4.00% |
Total | 137 | 100.00% | 25 | 100.00% |
void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls)
{
struct hlist_nulls_head *hash;
unsigned int nr_slots, i;
size_t sz;
if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head)))
return NULL;
BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head));
nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head));
if (nr_slots > (UINT_MAX / sizeof(struct hlist_nulls_head)))
return NULL;
sz = nr_slots * sizeof(struct hlist_nulls_head);
hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
get_order(sz));
if (!hash)
hash = vzalloc(sz);
if (hash && nulls)
for (i = 0; i < nr_slots; i++)
INIT_HLIST_NULLS_HEAD(&hash[i], i);
return hash;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 68 | 39.53% | 1 | 12.50% |
Eric Dumazet | 45 | 26.16% | 2 | 25.00% |
Florian Westphal | 35 | 20.35% | 1 | 12.50% |
Patrick McHardy | 21 | 12.21% | 2 | 25.00% |
Andrew Morton | 2 | 1.16% | 1 | 12.50% |
Stephen Hemminger | 1 | 0.58% | 1 | 12.50% |
Total | 172 | 100.00% | 8 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable);
int nf_conntrack_hash_resize(unsigned int hashsize)
{
int i, bucket;
unsigned int old_size;
struct hlist_nulls_head *hash, *old_hash;
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct;
if (!hashsize)
return -EINVAL;
hash = nf_ct_alloc_hashtable(&hashsize, 1);
if (!hash)
return -ENOMEM;
old_size = nf_conntrack_htable_size;
if (old_size == hashsize) {
nf_ct_free_hashtable(hash, hashsize);
return 0;
}
local_bh_disable();
nf_conntrack_all_lock();
write_seqcount_begin(&nf_conntrack_generation);
/* Lookups in the old hash might happen in parallel, which means we
* might get false negatives during connection lookup. New connections
* created because of a false negative won't make it into the hash
* though since that required taking the locks.
*/
for (i = 0; i < nf_conntrack_htable_size; i++) {
while (!hlist_nulls_empty(&nf_conntrack_hash[i])) {
h = hlist_nulls_entry(nf_conntrack_hash[i].first,
struct nf_conntrack_tuple_hash, hnnode);
ct = nf_ct_tuplehash_to_ctrack(h);
hlist_nulls_del_rcu(&h->hnnode);
bucket = __hash_conntrack(nf_ct_net(ct),
&h->tuple, hashsize);
hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]);
}
}
old_size = nf_conntrack_htable_size;
old_hash = nf_conntrack_hash;
nf_conntrack_hash = hash;
nf_conntrack_htable_size = hashsize;
write_seqcount_end(&nf_conntrack_generation);
nf_conntrack_all_unlock();
local_bh_enable();
synchronize_net();
nf_ct_free_hashtable(old_hash, old_size);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 144 | 62.07% | 1 | 7.14% |
Florian Westphal | 44 | 18.97% | 5 | 35.71% |
Patrick McHardy | 19 | 8.19% | 5 | 35.71% |
Jesper Dangaard Brouer | 15 | 6.47% | 1 | 7.14% |
Eric Dumazet | 9 | 3.88% | 1 | 7.14% |
Stephen Hemminger | 1 | 0.43% | 1 | 7.14% |
Total | 232 | 100.00% | 14 | 100.00% |
int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
{
unsigned int hashsize;
int rc;
if (current->nsproxy->net_ns != &init_net)
return -EOPNOTSUPP;
/* On boot, we can set this without any fancy locking. */
if (!nf_conntrack_htable_size)
return param_set_uint(val, kp);
rc = kstrtouint(val, 0, &hashsize);
if (rc)
return rc;
return nf_conntrack_hash_resize(hashsize);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 76 | 100.00% | 1 | 100.00% |
Total | 76 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize);
module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
&nf_conntrack_htable_size, 0600);
static __always_inline unsigned int total_extension_size(void)
{
/* remember to add new extensions below */
BUILD_BUG_ON(NF_CT_EXT_NUM > 9);
return sizeof(struct nf_ct_ext) +
sizeof(struct nf_conn_help)
#if IS_ENABLED(CONFIG_NF_NAT)
+ sizeof(struct nf_conn_nat)
#endif
+ sizeof(struct nf_conn_seqadj)
+ sizeof(struct nf_conn_acct)
#ifdef CONFIG_NF_CONNTRACK_EVENTS
+ sizeof(struct nf_conntrack_ecache)
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
+ sizeof(struct nf_conn_tstamp)
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+ sizeof(struct nf_conn_timeout)
#endif
#ifdef CONFIG_NF_CONNTRACK_LABELS
+ sizeof(struct nf_conn_labels)
#endif
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
+ sizeof(struct nf_conn_synproxy)
#endif
;
}Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 114 | 99.13% | 1 | 50.00% |
Geert Uytterhoeven | 1 | 0.87% | 1 | 50.00% |
Total | 115 | 100.00% | 2 | 100.00% |
;
int nf_conntrack_init_start(void)
{
int max_factor = 8;
int ret = -ENOMEM;
int i;
/* struct nf_ct_ext uses u8 to store offsets/size */
BUILD_BUG_ON(total_extension_size() > 255u);
seqcount_init(&nf_conntrack_generation);
for (i = 0; i < CONNTRACK_LOCKS; i++)
spin_lock_init(&nf_conntrack_locks[i]);
if (!nf_conntrack_htable_size) {
/* Idea from tcp.c: use 1/16384 of memory.
* On i386: 32MB machine has 512 buckets.
* >= 1GB machines have 16384 buckets.
* >= 4GB machines have 65536 buckets.
*/
nf_conntrack_htable_size
= (((totalram_pages << PAGE_SHIFT) / 16384)
/ sizeof(struct hlist_head));
if (totalram_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE)))
nf_conntrack_htable_size = 65536;
else if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE))
nf_conntrack_htable_size = 16384;
if (nf_conntrack_htable_size < 32)
nf_conntrack_htable_size = 32;
/* Use a max. factor of four by default to get the same max as
* with the old struct list_heads. When a table size is given
* we use the old value of 8 to avoid reducing the max.
* entries. */
max_factor = 4;
}
nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, 1);
if (!nf_conntrack_hash)
return -ENOMEM;
nf_conntrack_max = max_factor * nf_conntrack_htable_size;
nf_conntrack_cachep = kmem_cache_create("nf_conntrack",
sizeof(struct nf_conn),
NFCT_INFOMASK + 1,
SLAB_TYPESAFE_BY_RCU | SLAB_HWCACHE_ALIGN, NULL);
if (!nf_conntrack_cachep)
goto err_cachep;
printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n",
NF_CONNTRACK_VERSION, nf_conntrack_htable_size,
nf_conntrack_max);
ret = nf_conntrack_expect_init();
if (ret < 0)
goto err_expect;
ret = nf_conntrack_acct_init();
if (ret < 0)
goto err_acct;
ret = nf_conntrack_tstamp_init();
if (ret < 0)
goto err_tstamp;
ret = nf_conntrack_ecache_init();
if (ret < 0)
goto err_ecache;
ret = nf_conntrack_timeout_init();
if (ret < 0)
goto err_timeout;
ret = nf_conntrack_helper_init();
if (ret < 0)
goto err_helper;
ret = nf_conntrack_labels_init();
if (ret < 0)
goto err_labels;
ret = nf_conntrack_seqadj_init();
if (ret < 0)
goto err_seqadj;
ret = nf_conntrack_proto_init();
if (ret < 0)
goto err_proto;
conntrack_gc_work_init(&conntrack_gc_work);
queue_delayed_work(system_long_wq, &conntrack_gc_work.dwork, HZ);
return 0;
err_proto:
nf_conntrack_seqadj_fini();
err_seqadj:
nf_conntrack_labels_fini();
err_labels:
nf_conntrack_helper_fini();
err_helper:
nf_conntrack_timeout_fini();
err_timeout:
nf_conntrack_ecache_fini();
err_ecache:
nf_conntrack_tstamp_fini();
err_tstamp:
nf_conntrack_acct_fini();
err_acct:
nf_conntrack_expect_fini();
err_expect:
kmem_cache_destroy(nf_conntrack_cachep);
err_cachep:
nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size);
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Gao Feng | 150 | 36.06% | 9 | 32.14% |
Florian Westphal | 102 | 24.52% | 9 | 32.14% |
Yasuyuki Kozakai | 56 | 13.46% | 1 | 3.57% |
Patrick McHardy | 33 | 7.93% | 2 | 7.14% |
Alexey Dobriyan | 25 | 6.01% | 1 | 3.57% |
Marcelo Ricardo Leitner | 24 | 5.77% | 1 | 3.57% |
Jesper Dangaard Brouer | 21 | 5.05% | 1 | 3.57% |
Jan Beulich | 2 | 0.48% | 1 | 3.57% |
Stephen Hemminger | 1 | 0.24% | 1 | 3.57% |
Paul E. McKenney | 1 | 0.24% | 1 | 3.57% |
Eric Dumazet | 1 | 0.24% | 1 | 3.57% |
Total | 416 | 100.00% | 28 | 100.00% |
void nf_conntrack_init_end(void)
{
/* For use by REJECT target */
RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach);
RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Gao Feng | 22 | 100.00% | 1 | 100.00% |
Total | 22 | 100.00% | 1 | 100.00% |
/*
* We need to use special "null" values, not used in hash table
*/
#define UNCONFIRMED_NULLS_VAL ((1<<30)+0)
#define DYING_NULLS_VAL ((1<<30)+1)
#define TEMPLATE_NULLS_VAL ((1<<30)+2)
int nf_conntrack_init_net(struct net *net)
{
int ret = -ENOMEM;
int cpu;
BUILD_BUG_ON(IP_CT_UNTRACKED == IP_CT_NUMBER);
atomic_set(&net->ct.count, 0);
net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu);
if (!net->ct.pcpu_lists)
goto err_stat;
for_each_possible_cpu(cpu) {
struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
spin_lock_init(&pcpu->lock);
INIT_HLIST_NULLS_HEAD(&pcpu->unconfirmed, UNCONFIRMED_NULLS_VAL);
INIT_HLIST_NULLS_HEAD(&pcpu->dying, DYING_NULLS_VAL);
}
net->ct.stat = alloc_percpu(struct ip_conntrack_stat);
if (!net->ct.stat)
goto err_pcpu_lists;
ret = nf_conntrack_expect_pernet_init(net);
if (ret < 0)
goto err_expect;
ret = nf_conntrack_acct_pernet_init(net);
if (ret < 0)
goto err_acct;
ret = nf_conntrack_tstamp_pernet_init(net);
if (ret < 0)
goto err_tstamp;
ret = nf_conntrack_ecache_pernet_init(net);
if (ret < 0)
goto err_ecache;
ret = nf_conntrack_helper_pernet_init(net);
if (ret < 0)
goto err_helper;
ret = nf_conntrack_proto_pernet_init(net);
if (ret < 0)
goto err_proto;
return 0;
err_proto:
nf_conntrack_helper_pernet_fini(net);
err_helper:
nf_conntrack_ecache_pernet_fini(net);
err_ecache:
nf_conntrack_tstamp_pernet_fini(net);
err_tstamp:
nf_conntrack_acct_pernet_fini(net);
err_acct:
nf_conntrack_expect_pernet_fini(net);
err_expect:
free_percpu(net->ct.stat);
err_pcpu_lists:
free_percpu(net->ct.pcpu_lists);
err_stat:
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexey Dobriyan | 83 | 27.95% | 5 | 18.52% |
Jesper Dangaard Brouer | 73 | 24.58% | 1 | 3.70% |
Pablo Neira Ayuso | 56 | 18.86% | 4 | 14.81% |
Gao Feng | 26 | 8.75% | 7 | 25.93% |
Eric Leblond | 15 | 5.05% | 1 | 3.70% |
Florian Westphal | 13 | 4.38% | 2 | 7.41% |
Krzysztof Piotr Oledzki | 11 | 3.70% | 1 | 3.70% |
Patrick McHardy | 9 | 3.03% | 2 | 7.41% |
Yasuyuki Kozakai | 8 | 2.69% | 2 | 7.41% |
Eric Dumazet | 3 | 1.01% | 2 | 7.41% |
Total | 297 | 100.00% | 27 | 100.00% |
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Florian Westphal | 2339 | 25.14% | 49 | 20.16% |
Yasuyuki Kozakai | 2039 | 21.92% | 7 | 2.88% |
Pablo Neira Ayuso | 1091 | 11.73% | 30 | 12.35% |
Jesper Dangaard Brouer | 864 | 9.29% | 6 | 2.47% |
Patrick McHardy | 810 | 8.71% | 51 | 20.99% |
Martin Josefsson | 332 | 3.57% | 4 | 1.65% |
Gao Feng | 269 | 2.89% | 10 | 4.12% |
Alexey Dobriyan | 268 | 2.88% | 12 | 4.94% |
Eric Dumazet | 208 | 2.24% | 12 | 4.94% |
Changli Gao | 195 | 2.10% | 4 | 1.65% |
Jozsef Kadlecsik | 170 | 1.83% | 2 | 0.82% |
Daniel Borkmann | 124 | 1.33% | 4 | 1.65% |
Sasha Levin | 80 | 0.86% | 1 | 0.41% |
Vladimir Davydov | 72 | 0.77% | 1 | 0.41% |
Andrey Vagin | 59 | 0.63% | 1 | 0.41% |
Liping Zhang | 38 | 0.41% | 2 | 0.82% |
Manfred Spraul | 34 | 0.37% | 1 | 0.41% |
Eric Leblond | 32 | 0.34% | 2 | 0.82% |
Marcelo Ricardo Leitner | 24 | 0.26% | 1 | 0.41% |
Krzysztof Piotr Oledzki | 23 | 0.25% | 1 | 0.41% |
Holger Eitzenberger | 22 | 0.24% | 1 | 0.41% |
Philip Craig | 18 | 0.19% | 1 | 0.41% |
Harald Welte | 17 | 0.18% | 1 | 0.41% |
Fabian Hugelshofer | 17 | 0.18% | 1 | 0.41% |
Eric W. Biedermann | 16 | 0.17% | 1 | 0.41% |
James Morris | 14 | 0.15% | 1 | 0.41% |
Weongyo Jeong | 13 | 0.14% | 1 | 0.41% |
Stephen Hemminger | 11 | 0.12% | 4 | 1.65% |
Arnd Bergmann | 11 | 0.12% | 1 | 0.41% |
David S. Miller | 11 | 0.12% | 2 | 0.82% |
Joerg Marx | 10 | 0.11% | 1 | 0.41% |
Jan Engelhardt | 10 | 0.11% | 3 | 1.23% |
Herbert Xu | 9 | 0.10% | 1 | 0.41% |
Varsha Rao | 8 | 0.09% | 1 | 0.41% |
Al Viro | 7 | 0.08% | 2 | 0.82% |
Peter Zijlstra | 6 | 0.06% | 2 | 0.82% |
Paul E. McKenney | 4 | 0.04% | 1 | 0.41% |
Julia Lawall | 4 | 0.04% | 1 | 0.41% |
Ingo Molnar | 3 | 0.03% | 1 | 0.41% |
Joe Stringer | 3 | 0.03% | 1 | 0.41% |
Jan Beulich | 2 | 0.02% | 1 | 0.41% |
Joe Perches | 2 | 0.02% | 1 | 0.41% |
Andrew Morton | 2 | 0.02% | 1 | 0.41% |
Brian Haley | 2 | 0.02% | 1 | 0.41% |
Igor Maravić | 1 | 0.01% | 1 | 0.41% |
Hagen Paul Pfeifer | 1 | 0.01% | 1 | 0.41% |
Sami Farin | 1 | 0.01% | 1 | 0.41% |
Christoph Paasch | 1 | 0.01% | 1 | 0.41% |
Aaron Conole | 1 | 0.01% | 1 | 0.41% |
KOVACS Krisztian | 1 | 0.01% | 1 | 0.41% |
Arnaldo Carvalho de Melo | 1 | 0.01% | 1 | 0.41% |
Subash Abhinov Kasiviswanathan | 1 | 0.01% | 1 | 0.41% |
Lucas De Marchi | 1 | 0.01% | 1 | 0.41% |
Geert Uytterhoeven | 1 | 0.01% | 1 | 0.41% |
Total | 9303 | 100.00% | 243 | 100.00% |
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