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[NETFILTER]: nf_conntrack_helper: use hashtable for conntrack helpers 

Eliminate the last global list searched for every new connection.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-07-07 22:36:46 -07:00 committed by David S. Miller
parent f264a7df08
commit b8a7fe6c10
2 changed files with 59 additions and 15 deletions
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4
include/net/netfilter/nf_conntrack_helper.h
View File

@ -15,8 +15,8 @@
struct module;
struct nf_conntrack_helper
{
struct list_head list; /* Internal use. */
{
struct hlist_node hnode; /* Internal use. */
const char *name; /* name of the module */
struct module *me; /* pointer to self */

70
net/netfilter/nf_conntrack_helper.c
View File

@ -28,23 +28,41 @@
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_extend.h>
static __read_mostly LIST_HEAD(helpers);
static struct hlist_head *nf_ct_helper_hash __read_mostly;
static unsigned int nf_ct_helper_hsize __read_mostly;
static unsigned int nf_ct_helper_count __read_mostly;
static int nf_ct_helper_vmalloc;
/* Stupid hash, but collision free for the default registrations of the
* helpers currently in the kernel. */
static unsigned int helper_hash(const struct nf_conntrack_tuple *tuple)
{
return (((tuple->src.l3num << 8) | tuple->dst.protonum) ^
tuple->src.u.all) % nf_ct_helper_hsize;
}
struct nf_conntrack_helper *
__nf_ct_helper_find(const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_helper *h;
struct nf_conntrack_helper *helper;
struct nf_conntrack_tuple_mask mask = { .src.u.all = htons(0xFFFF) };
struct hlist_node *n;
unsigned int h;
list_for_each_entry(h, &helpers, list) {
if (nf_ct_tuple_src_mask_cmp(tuple, &h->tuple, &mask))
return h;
if (!nf_ct_helper_count)
return NULL;
h = helper_hash(tuple);
hlist_for_each_entry(helper, n, &nf_ct_helper_hash[h], hnode) {
if (nf_ct_tuple_src_mask_cmp(tuple, &helper->tuple, &mask))
return helper;
}
return NULL;
}
struct nf_conntrack_helper *
nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple)
nf_ct_helper_find_get(const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_helper *helper;
@ -77,12 +95,15 @@ struct nf_conntrack_helper *
__nf_conntrack_helper_find_byname(const char *name)
{
struct nf_conntrack_helper *h;
struct hlist_node *n;
unsigned int i;
list_for_each_entry(h, &helpers, list) {
if (!strcmp(h->name, name))
return h;
for (i = 0; i < nf_ct_helper_hsize; i++) {
hlist_for_each_entry(h, n, &nf_ct_helper_hash[i], hnode) {
if (!strcmp(h->name, name))
return h;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(__nf_conntrack_helper_find_byname);
@ -115,10 +136,13 @@ static inline int unhelp(struct nf_conntrack_tuple_hash *i,
int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
{
unsigned int h = helper_hash(&me->tuple);
BUG_ON(me->timeout == 0);
write_lock_bh(&nf_conntrack_lock);
list_add(&me->list, &helpers);
hlist_add_head(&me->hnode, &nf_ct_helper_hash[h]);
nf_ct_helper_count++;
write_unlock_bh(&nf_conntrack_lock);
return 0;
@ -134,7 +158,8 @@ void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
/* Need write lock here, to delete helper. */
write_lock_bh(&nf_conntrack_lock);
list_del(&me->list);
hlist_del(&me->hnode);
nf_ct_helper_count--;
/* Get rid of expectations */
for (i = 0; i < nf_ct_expect_hsize; i++) {
@ -171,10 +196,29 @@ static struct nf_ct_ext_type helper_extend __read_mostly = {
int nf_conntrack_helper_init()
{
return nf_ct_extend_register(&helper_extend);
int err;
nf_ct_helper_hsize = 1; /* gets rounded up to use one page */
nf_ct_helper_hash = nf_ct_alloc_hashtable(&nf_ct_helper_hsize,
&nf_ct_helper_vmalloc);
if (!nf_ct_helper_hash)
return -ENOMEM;
err = nf_ct_extend_register(&helper_extend);
if (err < 0)
goto err1;
return 0;
err1:
nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_vmalloc,
nf_ct_helper_hsize);
return err;
}
void nf_conntrack_helper_fini()
{
nf_ct_extend_unregister(&helper_extend);
nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_vmalloc,
nf_ct_helper_hsize);
}