[NETFILTER]: nf_conntrack: /proc compatibility with old connection tracking

This patch adds /proc/net/ip_conntrack, /proc/net/ip_conntrack_expect and
/proc/net/stat/ip_conntrack files to keep old programs using them working.

The /proc/net/ip_conntrack and /proc/net/ip_conntrack_expect files show only
IPv4 entries, the /proc/net/stat/ip_conntrack shows global statistics.

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2006-11-29 02:35:22 +01:00 committed by David S. Miller
parent a999e68376
commit e4bd8bce3e
6 changed files with 434 additions and 1 deletions

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@ -41,4 +41,7 @@ extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4;
extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4;
extern struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp;
extern int nf_conntrack_ipv4_compat_init(void);
extern void nf_conntrack_ipv4_compat_fini(void);
#endif /*_NF_CONNTRACK_IPV4_H*/

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@ -89,6 +89,11 @@ obj-$(CONFIG_IP_NF_QUEUE) += ip_queue.o
# objects for l3 independent conntrack
nf_conntrack_ipv4-objs := nf_conntrack_l3proto_ipv4.o nf_conntrack_proto_icmp.o
ifeq ($(CONFIG_NF_CONNTRACK_PROC_COMPAT),y)
ifeq ($(CONFIG_PROC_FS),y)
nf_conntrack_ipv4-objs += nf_conntrack_l3proto_ipv4_compat.o
endif
endif
# l3 independent conntrack
obj-$(CONFIG_NF_CONNTRACK_IPV4) += nf_conntrack_ipv4.o

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@ -492,8 +492,16 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
printk("nf_conntrack_ipv4: can't register hooks.\n");
goto cleanup_ipv4;
}
#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
ret = nf_conntrack_ipv4_compat_init();
if (ret < 0)
goto cleanup_hooks;
#endif
return ret;
#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
cleanup_hooks:
nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
#endif
cleanup_ipv4:
nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
cleanup_icmp:
@ -510,6 +518,9 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
static void __exit nf_conntrack_l3proto_ipv4_fini(void)
{
synchronize_net();
#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
nf_conntrack_ipv4_compat_fini();
#endif
nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmp);

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@ -0,0 +1,412 @@
/* ip_conntrack proc compat - based on ip_conntrack_standalone.c
*
* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
*
* 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.
*/
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/percpu.h>
#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_expect.h>
#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif
#ifdef CONFIG_NF_CT_ACCT
static unsigned int
seq_print_counters(struct seq_file *s,
const struct ip_conntrack_counter *counter)
{
return seq_printf(s, "packets=%llu bytes=%llu ",
(unsigned long long)counter->packets,
(unsigned long long)counter->bytes);
}
#else
#define seq_print_counters(x, y) 0
#endif
struct ct_iter_state {
unsigned int bucket;
};
static struct list_head *ct_get_first(struct seq_file *seq)
{
struct ct_iter_state *st = seq->private;
for (st->bucket = 0;
st->bucket < nf_conntrack_htable_size;
st->bucket++) {
if (!list_empty(&nf_conntrack_hash[st->bucket]))
return nf_conntrack_hash[st->bucket].next;
}
return NULL;
}
static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
{
struct ct_iter_state *st = seq->private;
head = head->next;
while (head == &nf_conntrack_hash[st->bucket]) {
if (++st->bucket >= nf_conntrack_htable_size)
return NULL;
head = nf_conntrack_hash[st->bucket].next;
}
return head;
}
static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
{
struct list_head *head = ct_get_first(seq);
if (head)
while (pos && (head = ct_get_next(seq, head)))
pos--;
return pos ? NULL : head;
}
static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
{
read_lock_bh(&nf_conntrack_lock);
return ct_get_idx(seq, *pos);
}
static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
(*pos)++;
return ct_get_next(s, v);
}
static void ct_seq_stop(struct seq_file *s, void *v)
{
read_unlock_bh(&nf_conntrack_lock);
}
static int ct_seq_show(struct seq_file *s, void *v)
{
const struct nf_conntrack_tuple_hash *hash = v;
const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_l4proto *l4proto;
NF_CT_ASSERT(ct);
/* we only want to print DIR_ORIGINAL */
if (NF_CT_DIRECTION(hash))
return 0;
if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num != AF_INET)
return 0;
l3proto = __nf_ct_l3proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.src.l3num);
NF_CT_ASSERT(l3proto);
l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.src.l3num,
ct->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.dst.protonum);
NF_CT_ASSERT(l4proto);
if (seq_printf(s, "%-8s %u %ld ",
l4proto->name,
ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
timer_pending(&ct->timeout)
? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
return -ENOSPC;
if (l3proto->print_conntrack(s, ct))
return -ENOSPC;
if (l4proto->print_conntrack(s, ct))
return -ENOSPC;
if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
l3proto, l4proto))
return -ENOSPC;
if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
return -ENOSPC;
if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
if (seq_printf(s, "[UNREPLIED] "))
return -ENOSPC;
if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
l3proto, l4proto))
return -ENOSPC;
if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
return -ENOSPC;
if (test_bit(IPS_ASSURED_BIT, &ct->status))
if (seq_printf(s, "[ASSURED] "))
return -ENOSPC;
#ifdef CONFIG_NF_CONNTRACK_MARK
if (seq_printf(s, "mark=%u ", ct->mark))
return -ENOSPC;
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
if (seq_printf(s, "secmark=%u ", ct->secmark))
return -ENOSPC;
#endif
if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
return -ENOSPC;
return 0;
}
static struct seq_operations ct_seq_ops = {
.start = ct_seq_start,
.next = ct_seq_next,
.stop = ct_seq_stop,
.show = ct_seq_show
};
static int ct_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
struct ct_iter_state *st;
int ret;
st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
if (st == NULL)
return -ENOMEM;
ret = seq_open(file, &ct_seq_ops);
if (ret)
goto out_free;
seq = file->private_data;
seq->private = st;
memset(st, 0, sizeof(struct ct_iter_state));
return ret;
out_free:
kfree(st);
return ret;
}
static struct file_operations ct_file_ops = {
.owner = THIS_MODULE,
.open = ct_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
/* expects */
static void *exp_seq_start(struct seq_file *s, loff_t *pos)
{
struct list_head *e = &nf_conntrack_expect_list;
loff_t i;
/* strange seq_file api calls stop even if we fail,
* thus we need to grab lock since stop unlocks */
read_lock_bh(&nf_conntrack_lock);
if (list_empty(e))
return NULL;
for (i = 0; i <= *pos; i++) {
e = e->next;
if (e == &nf_conntrack_expect_list)
return NULL;
}
return e;
}
static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct list_head *e = v;
++*pos;
e = e->next;
if (e == &nf_conntrack_expect_list)
return NULL;
return e;
}
static void exp_seq_stop(struct seq_file *s, void *v)
{
read_unlock_bh(&nf_conntrack_lock);
}
static int exp_seq_show(struct seq_file *s, void *v)
{
struct nf_conntrack_expect *exp = v;
if (exp->tuple.src.l3num != AF_INET)
return 0;
if (exp->timeout.function)
seq_printf(s, "%ld ", timer_pending(&exp->timeout)
? (long)(exp->timeout.expires - jiffies)/HZ : 0);
else
seq_printf(s, "- ");
seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
print_tuple(s, &exp->tuple,
__nf_ct_l3proto_find(exp->tuple.src.l3num),
__nf_ct_l4proto_find(exp->tuple.src.l3num,
exp->tuple.dst.protonum));
return seq_putc(s, '\n');
}
static struct seq_operations exp_seq_ops = {
.start = exp_seq_start,
.next = exp_seq_next,
.stop = exp_seq_stop,
.show = exp_seq_show
};
static int exp_open(struct inode *inode, struct file *file)
{
return seq_open(file, &exp_seq_ops);
}
static struct file_operations ip_exp_file_ops = {
.owner = THIS_MODULE,
.open = exp_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release
};
static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
{
int cpu;
if (*pos == 0)
return SEQ_START_TOKEN;
for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
if (!cpu_possible(cpu))
continue;
*pos = cpu+1;
return &per_cpu(nf_conntrack_stat, cpu);
}
return NULL;
}
static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
int cpu;
for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
if (!cpu_possible(cpu))
continue;
*pos = cpu+1;
return &per_cpu(nf_conntrack_stat, cpu);
}
return NULL;
}
static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
{
}
static int ct_cpu_seq_show(struct seq_file *seq, void *v)
{
unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
struct ip_conntrack_stat *st = v;
if (v == SEQ_START_TOKEN) {
seq_printf(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete\n");
return 0;
}
seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
"%08x %08x %08x %08x %08x %08x %08x %08x \n",
nr_conntracks,
st->searched,
st->found,
st->new,
st->invalid,
st->ignore,
st->delete,
st->delete_list,
st->insert,
st->insert_failed,
st->drop,
st->early_drop,
st->error,
st->expect_new,
st->expect_create,
st->expect_delete
);
return 0;
}
static struct seq_operations ct_cpu_seq_ops = {
.start = ct_cpu_seq_start,
.next = ct_cpu_seq_next,
.stop = ct_cpu_seq_stop,
.show = ct_cpu_seq_show,
};
static int ct_cpu_seq_open(struct inode *inode, struct file *file)
{
return seq_open(file, &ct_cpu_seq_ops);
}
static struct file_operations ct_cpu_seq_fops = {
.owner = THIS_MODULE,
.open = ct_cpu_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
int __init nf_conntrack_ipv4_compat_init(void)
{
struct proc_dir_entry *proc, *proc_exp, *proc_stat;
proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
if (!proc)
goto err1;
proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
&ip_exp_file_ops);
if (!proc_exp)
goto err2;
proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
if (!proc_stat)
goto err3;
proc_stat->proc_fops = &ct_cpu_seq_fops;
proc_stat->owner = THIS_MODULE;
return 0;
err3:
proc_net_remove("ip_conntrack_expect");
err2:
proc_net_remove("ip_conntrack");
err1:
return -ENOMEM;
}
void __exit nf_conntrack_ipv4_compat_fini(void)
{
remove_proc_entry("ip_conntrack", proc_net_stat);
proc_net_remove("ip_conntrack_expect");
proc_net_remove("ip_conntrack");
}

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@ -92,3 +92,4 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_generic = {
.prepare = generic_prepare,
.get_features = generic_get_features,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_generic);

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@ -52,6 +52,7 @@ print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
{
return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
}
EXPORT_SYMBOL_GPL(print_tuple);
#ifdef CONFIG_NF_CT_ACCT
static unsigned int