[NETFILTER]: nf_conntrack: split out helper handling
This patch splits out handling of helpers into its own file nf_conntrack_helper.c Signed-off-by: Martin Josefsson <gandalf@wlug.westbo.se> Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
parent
77ab9cff0f
commit
7e5d03bb9d
|
@ -80,4 +80,6 @@ print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
|
||||||
extern struct list_head *nf_conntrack_hash;
|
extern struct list_head *nf_conntrack_hash;
|
||||||
extern struct list_head nf_conntrack_expect_list;
|
extern struct list_head nf_conntrack_expect_list;
|
||||||
extern rwlock_t nf_conntrack_lock ;
|
extern rwlock_t nf_conntrack_lock ;
|
||||||
|
extern struct list_head unconfirmed;
|
||||||
|
|
||||||
#endif /* _NF_CONNTRACK_CORE_H */
|
#endif /* _NF_CONNTRACK_CORE_H */
|
||||||
|
|
|
@ -37,6 +37,16 @@ struct nf_conntrack_helper
|
||||||
int (*to_nfattr)(struct sk_buff *skb, const struct nf_conn *ct);
|
int (*to_nfattr)(struct sk_buff *skb, const struct nf_conn *ct);
|
||||||
};
|
};
|
||||||
|
|
||||||
|
extern struct nf_conntrack_helper *
|
||||||
|
__nf_ct_helper_find(const struct nf_conntrack_tuple *tuple);
|
||||||
|
|
||||||
|
extern struct nf_conntrack_helper *
|
||||||
|
nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple);
|
||||||
|
|
||||||
|
extern struct nf_conntrack_helper *
|
||||||
|
__nf_conntrack_helper_find_byname(const char *name);
|
||||||
|
|
||||||
|
extern void nf_ct_helper_put(struct nf_conntrack_helper *helper);
|
||||||
extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
|
extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
|
||||||
extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
|
extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
|
||||||
|
|
||||||
|
|
|
@ -1,5 +1,5 @@
|
||||||
netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o
|
netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o
|
||||||
nf_conntrack-objs := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o
|
nf_conntrack-objs := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_helper.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o
|
||||||
|
|
||||||
obj-$(CONFIG_NETFILTER) = netfilter.o
|
obj-$(CONFIG_NETFILTER) = netfilter.o
|
||||||
|
|
||||||
|
|
|
@ -75,13 +75,12 @@ atomic_t nf_conntrack_count = ATOMIC_INIT(0);
|
||||||
void (*nf_conntrack_destroyed)(struct nf_conn *conntrack) = NULL;
|
void (*nf_conntrack_destroyed)(struct nf_conn *conntrack) = NULL;
|
||||||
struct nf_conntrack_protocol **nf_ct_protos[PF_MAX] __read_mostly;
|
struct nf_conntrack_protocol **nf_ct_protos[PF_MAX] __read_mostly;
|
||||||
struct nf_conntrack_l3proto *nf_ct_l3protos[PF_MAX] __read_mostly;
|
struct nf_conntrack_l3proto *nf_ct_l3protos[PF_MAX] __read_mostly;
|
||||||
static LIST_HEAD(helpers);
|
|
||||||
unsigned int nf_conntrack_htable_size __read_mostly = 0;
|
unsigned int nf_conntrack_htable_size __read_mostly = 0;
|
||||||
int nf_conntrack_max __read_mostly;
|
int nf_conntrack_max __read_mostly;
|
||||||
struct list_head *nf_conntrack_hash __read_mostly;
|
struct list_head *nf_conntrack_hash __read_mostly;
|
||||||
struct nf_conn nf_conntrack_untracked;
|
struct nf_conn nf_conntrack_untracked;
|
||||||
unsigned int nf_ct_log_invalid __read_mostly;
|
unsigned int nf_ct_log_invalid __read_mostly;
|
||||||
static LIST_HEAD(unconfirmed);
|
LIST_HEAD(unconfirmed);
|
||||||
static int nf_conntrack_vmalloc __read_mostly;
|
static int nf_conntrack_vmalloc __read_mostly;
|
||||||
|
|
||||||
static unsigned int nf_conntrack_next_id;
|
static unsigned int nf_conntrack_next_id;
|
||||||
|
@ -696,46 +695,6 @@ static int early_drop(struct list_head *chain)
|
||||||
return dropped;
|
return dropped;
|
||||||
}
|
}
|
||||||
|
|
||||||
static struct nf_conntrack_helper *
|
|
||||||
__nf_ct_helper_find(const struct nf_conntrack_tuple *tuple)
|
|
||||||
{
|
|
||||||
struct nf_conntrack_helper *h;
|
|
||||||
|
|
||||||
list_for_each_entry(h, &helpers, list) {
|
|
||||||
if (nf_ct_tuple_mask_cmp(tuple, &h->tuple, &h->mask))
|
|
||||||
return h;
|
|
||||||
}
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
struct nf_conntrack_helper *
|
|
||||||
nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple)
|
|
||||||
{
|
|
||||||
struct nf_conntrack_helper *helper;
|
|
||||||
|
|
||||||
/* need nf_conntrack_lock to assure that helper exists until
|
|
||||||
* try_module_get() is called */
|
|
||||||
read_lock_bh(&nf_conntrack_lock);
|
|
||||||
|
|
||||||
helper = __nf_ct_helper_find(tuple);
|
|
||||||
if (helper) {
|
|
||||||
/* need to increase module usage count to assure helper will
|
|
||||||
* not go away while the caller is e.g. busy putting a
|
|
||||||
* conntrack in the hash that uses the helper */
|
|
||||||
if (!try_module_get(helper->me))
|
|
||||||
helper = NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
read_unlock_bh(&nf_conntrack_lock);
|
|
||||||
|
|
||||||
return helper;
|
|
||||||
}
|
|
||||||
|
|
||||||
void nf_ct_helper_put(struct nf_conntrack_helper *helper)
|
|
||||||
{
|
|
||||||
module_put(helper->me);
|
|
||||||
}
|
|
||||||
|
|
||||||
static struct nf_conn *
|
static struct nf_conn *
|
||||||
__nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
|
__nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
|
||||||
const struct nf_conntrack_tuple *repl,
|
const struct nf_conntrack_tuple *repl,
|
||||||
|
@ -1035,83 +994,6 @@ int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
|
||||||
orig->dst.protonum));
|
orig->dst.protonum));
|
||||||
}
|
}
|
||||||
|
|
||||||
int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
|
|
||||||
{
|
|
||||||
int ret;
|
|
||||||
BUG_ON(me->timeout == 0);
|
|
||||||
|
|
||||||
ret = nf_conntrack_register_cache(NF_CT_F_HELP, "nf_conntrack:help",
|
|
||||||
sizeof(struct nf_conn)
|
|
||||||
+ sizeof(struct nf_conn_help)
|
|
||||||
+ __alignof__(struct nf_conn_help));
|
|
||||||
if (ret < 0) {
|
|
||||||
printk(KERN_ERR "nf_conntrack_helper_reigster: Unable to create slab cache for conntracks\n");
|
|
||||||
return ret;
|
|
||||||
}
|
|
||||||
write_lock_bh(&nf_conntrack_lock);
|
|
||||||
list_add(&me->list, &helpers);
|
|
||||||
write_unlock_bh(&nf_conntrack_lock);
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
struct nf_conntrack_helper *
|
|
||||||
__nf_conntrack_helper_find_byname(const char *name)
|
|
||||||
{
|
|
||||||
struct nf_conntrack_helper *h;
|
|
||||||
|
|
||||||
list_for_each_entry(h, &helpers, list) {
|
|
||||||
if (!strcmp(h->name, name))
|
|
||||||
return h;
|
|
||||||
}
|
|
||||||
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
static inline void unhelp(struct nf_conntrack_tuple_hash *i,
|
|
||||||
const struct nf_conntrack_helper *me)
|
|
||||||
{
|
|
||||||
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i);
|
|
||||||
struct nf_conn_help *help = nfct_help(ct);
|
|
||||||
|
|
||||||
if (help && help->helper == me) {
|
|
||||||
nf_conntrack_event(IPCT_HELPER, ct);
|
|
||||||
help->helper = NULL;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
|
|
||||||
{
|
|
||||||
unsigned int i;
|
|
||||||
struct nf_conntrack_tuple_hash *h;
|
|
||||||
struct nf_conntrack_expect *exp, *tmp;
|
|
||||||
|
|
||||||
/* Need write lock here, to delete helper. */
|
|
||||||
write_lock_bh(&nf_conntrack_lock);
|
|
||||||
list_del(&me->list);
|
|
||||||
|
|
||||||
/* Get rid of expectations */
|
|
||||||
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, list) {
|
|
||||||
struct nf_conn_help *help = nfct_help(exp->master);
|
|
||||||
if (help->helper == me && del_timer(&exp->timeout)) {
|
|
||||||
nf_ct_unlink_expect(exp);
|
|
||||||
nf_conntrack_expect_put(exp);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Get rid of expecteds, set helpers to NULL. */
|
|
||||||
list_for_each_entry(h, &unconfirmed, list)
|
|
||||||
unhelp(h, me);
|
|
||||||
for (i = 0; i < nf_conntrack_htable_size; i++) {
|
|
||||||
list_for_each_entry(h, &nf_conntrack_hash[i], list)
|
|
||||||
unhelp(h, me);
|
|
||||||
}
|
|
||||||
write_unlock_bh(&nf_conntrack_lock);
|
|
||||||
|
|
||||||
/* Someone could be still looking at the helper in a bh. */
|
|
||||||
synchronize_net();
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
|
/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
|
||||||
void __nf_ct_refresh_acct(struct nf_conn *ct,
|
void __nf_ct_refresh_acct(struct nf_conn *ct,
|
||||||
enum ip_conntrack_info ctinfo,
|
enum ip_conntrack_info ctinfo,
|
||||||
|
|
|
@ -0,0 +1,151 @@
|
||||||
|
/* Helper handling for netfilter. */
|
||||||
|
|
||||||
|
/* (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>
|
||||||
|
*
|
||||||
|
* 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/netfilter.h>
|
||||||
|
#include <linux/module.h>
|
||||||
|
#include <linux/skbuff.h>
|
||||||
|
#include <linux/vmalloc.h>
|
||||||
|
#include <linux/stddef.h>
|
||||||
|
#include <linux/slab.h>
|
||||||
|
#include <linux/random.h>
|
||||||
|
#include <linux/err.h>
|
||||||
|
#include <linux/kernel.h>
|
||||||
|
#include <linux/netdevice.h>
|
||||||
|
|
||||||
|
#define ASSERT_READ_LOCK(x)
|
||||||
|
#define ASSERT_WRITE_LOCK(x)
|
||||||
|
|
||||||
|
#include <net/netfilter/nf_conntrack.h>
|
||||||
|
#include <net/netfilter/nf_conntrack_l3proto.h>
|
||||||
|
#include <net/netfilter/nf_conntrack_protocol.h>
|
||||||
|
#include <net/netfilter/nf_conntrack_helper.h>
|
||||||
|
#include <net/netfilter/nf_conntrack_core.h>
|
||||||
|
|
||||||
|
static LIST_HEAD(helpers);
|
||||||
|
|
||||||
|
struct nf_conntrack_helper *
|
||||||
|
__nf_ct_helper_find(const struct nf_conntrack_tuple *tuple)
|
||||||
|
{
|
||||||
|
struct nf_conntrack_helper *h;
|
||||||
|
|
||||||
|
list_for_each_entry(h, &helpers, list) {
|
||||||
|
if (nf_ct_tuple_mask_cmp(tuple, &h->tuple, &h->mask))
|
||||||
|
return h;
|
||||||
|
}
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
struct nf_conntrack_helper *
|
||||||
|
nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple)
|
||||||
|
{
|
||||||
|
struct nf_conntrack_helper *helper;
|
||||||
|
|
||||||
|
/* need nf_conntrack_lock to assure that helper exists until
|
||||||
|
* try_module_get() is called */
|
||||||
|
read_lock_bh(&nf_conntrack_lock);
|
||||||
|
|
||||||
|
helper = __nf_ct_helper_find(tuple);
|
||||||
|
if (helper) {
|
||||||
|
/* need to increase module usage count to assure helper will
|
||||||
|
* not go away while the caller is e.g. busy putting a
|
||||||
|
* conntrack in the hash that uses the helper */
|
||||||
|
if (!try_module_get(helper->me))
|
||||||
|
helper = NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
read_unlock_bh(&nf_conntrack_lock);
|
||||||
|
|
||||||
|
return helper;
|
||||||
|
}
|
||||||
|
|
||||||
|
void nf_ct_helper_put(struct nf_conntrack_helper *helper)
|
||||||
|
{
|
||||||
|
module_put(helper->me);
|
||||||
|
}
|
||||||
|
|
||||||
|
struct nf_conntrack_helper *
|
||||||
|
__nf_conntrack_helper_find_byname(const char *name)
|
||||||
|
{
|
||||||
|
struct nf_conntrack_helper *h;
|
||||||
|
|
||||||
|
list_for_each_entry(h, &helpers, list) {
|
||||||
|
if (!strcmp(h->name, name))
|
||||||
|
return h;
|
||||||
|
}
|
||||||
|
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline int unhelp(struct nf_conntrack_tuple_hash *i,
|
||||||
|
const struct nf_conntrack_helper *me)
|
||||||
|
{
|
||||||
|
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i);
|
||||||
|
struct nf_conn_help *help = nfct_help(ct);
|
||||||
|
|
||||||
|
if (help && help->helper == me) {
|
||||||
|
nf_conntrack_event(IPCT_HELPER, ct);
|
||||||
|
help->helper = NULL;
|
||||||
|
}
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
|
||||||
|
{
|
||||||
|
int ret;
|
||||||
|
BUG_ON(me->timeout == 0);
|
||||||
|
|
||||||
|
ret = nf_conntrack_register_cache(NF_CT_F_HELP, "nf_conntrack:help",
|
||||||
|
sizeof(struct nf_conn)
|
||||||
|
+ sizeof(struct nf_conn_help)
|
||||||
|
+ __alignof__(struct nf_conn_help));
|
||||||
|
if (ret < 0) {
|
||||||
|
printk(KERN_ERR "nf_conntrack_helper_register: Unable to create slab cache for conntracks\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
write_lock_bh(&nf_conntrack_lock);
|
||||||
|
list_add(&me->list, &helpers);
|
||||||
|
write_unlock_bh(&nf_conntrack_lock);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
|
||||||
|
{
|
||||||
|
unsigned int i;
|
||||||
|
struct nf_conntrack_tuple_hash *h;
|
||||||
|
struct nf_conntrack_expect *exp, *tmp;
|
||||||
|
|
||||||
|
/* Need write lock here, to delete helper. */
|
||||||
|
write_lock_bh(&nf_conntrack_lock);
|
||||||
|
list_del(&me->list);
|
||||||
|
|
||||||
|
/* Get rid of expectations */
|
||||||
|
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, list) {
|
||||||
|
struct nf_conn_help *help = nfct_help(exp->master);
|
||||||
|
if (help->helper == me && del_timer(&exp->timeout)) {
|
||||||
|
nf_ct_unlink_expect(exp);
|
||||||
|
nf_conntrack_expect_put(exp);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Get rid of expecteds, set helpers to NULL. */
|
||||||
|
list_for_each_entry(h, &unconfirmed, list)
|
||||||
|
unhelp(h, me);
|
||||||
|
for (i = 0; i < nf_conntrack_htable_size; i++) {
|
||||||
|
list_for_each_entry(h, &nf_conntrack_hash[i], list)
|
||||||
|
unhelp(h, me);
|
||||||
|
}
|
||||||
|
write_unlock_bh(&nf_conntrack_lock);
|
||||||
|
|
||||||
|
/* Someone could be still looking at the helper in a bh. */
|
||||||
|
synchronize_net();
|
||||||
|
}
|
Reference in New Issue