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Commit b560580a authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NETFILTER]: nf_conntrack_expect: maintain per conntrack expectation list 



This patch brings back the per-conntrack expectation list that was
removed around 2.6.10 to avoid walking all expectations on expectation
eviction and conntrack destruction.

As these were the last users of the global expectation list, this patch
also kills that.

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 31f15875

include/net/netfilter/nf_conntrack.h

+2 −0
Original line number Diff line number Diff line
@@ -82,6 +82,8 @@ struct nf_conn_help { 


	union nf_conntrack_help help;



	struct hlist_head expectations;



	/* Current number of expected connections */

	unsigned int expecting;

};

include/net/netfilter/nf_conntrack_expect.h

+2 −3
Original line number Diff line number Diff line
@@ -6,14 +6,13 @@ 
#define _NF_CONNTRACK_EXPECT_H

#include <net/netfilter/nf_conntrack.h>



extern struct list_head nf_ct_expect_list;

extern struct hlist_head *nf_ct_expect_hash;

extern unsigned int nf_ct_expect_hsize;



struct nf_conntrack_expect

{

	/* Internal linked list (global expectation list) */

	struct list_head list;

	/* Conntrack expectation list member */

	struct hlist_node lnode;



	/* Hash member */

	struct hlist_node hnode;

include/net/netfilter/nf_conntrack_helper.h

+2 −0
Original line number Diff line number Diff line
@@ -52,6 +52,8 @@ extern void nf_ct_helper_put(struct nf_conntrack_helper *helper); 
extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);

extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);



extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);



static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)

{

	return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);

net/netfilter/nf_conntrack_core.c

+4 −14
Original line number Diff line number Diff line
@@ -502,12 +502,9 @@ init_conntrack(const struct nf_conntrack_tuple *tuple, 
		__set_bit(IPS_EXPECTED_BIT, &conntrack->status);

		conntrack->master = exp->master;

		if (exp->helper) {

			help = nf_ct_ext_add(conntrack, NF_CT_EXT_HELPER,

					     GFP_ATOMIC);

			help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC);

			if (help)

				rcu_assign_pointer(help->helper, exp->helper);

			else

				DEBUGP("failed to add helper extension area");

		}



#ifdef CONFIG_NF_CONNTRACK_MARK
@@ -523,14 +520,9 @@ init_conntrack(const struct nf_conntrack_tuple *tuple, 


		helper = __nf_ct_helper_find(&repl_tuple);

		if (helper) {

			help = nf_ct_ext_add(conntrack, NF_CT_EXT_HELPER,

					     GFP_ATOMIC);

			help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC);

			if (help)

				/* not in hash table yet, so not strictly

				   necessary */

				rcu_assign_pointer(help->helper, helper);

			else

				DEBUGP("failed to add helper extension area");

		}

		NF_CT_STAT_INC(new);

	}
@@ -721,11 +713,9 @@ void nf_conntrack_alter_reply(struct nf_conn *ct, 
	}



	if (help == NULL) {

		help = nf_ct_ext_add(ct, NF_CT_EXT_HELPER, GFP_ATOMIC);

		if (help == NULL) {

			DEBUGP("failed to add helper extension area");

		help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);

		if (help == NULL)

			goto out;

		}

	} else {

		memset(&help->help, 0, sizeof(help->help));

	}

net/netfilter/nf_conntrack_expect.c

+20 −20
Original line number Diff line number Diff line
@@ -27,9 +27,6 @@ 
#include <net/netfilter/nf_conntrack_helper.h>

#include <net/netfilter/nf_conntrack_tuple.h>



LIST_HEAD(nf_ct_expect_list);

EXPORT_SYMBOL_GPL(nf_ct_expect_list);



struct hlist_head *nf_ct_expect_hash __read_mostly;

EXPORT_SYMBOL_GPL(nf_ct_expect_hash);
@@ -52,13 +49,14 @@ void nf_ct_unlink_expect(struct nf_conntrack_expect *exp) 
	NF_CT_ASSERT(master_help);

	NF_CT_ASSERT(!timer_pending(&exp->timeout));



	list_del(&exp->list);

	hlist_del(&exp->hnode);

	nf_ct_expect_count--;



	NF_CT_STAT_INC(expect_delete);

	hlist_del(&exp->lnode);

	master_help->expecting--;

	nf_ct_expect_put(exp);



	NF_CT_STAT_INC(expect_delete);

}

EXPORT_SYMBOL_GPL(nf_ct_unlink_expect);
@@ -153,17 +151,18 @@ nf_ct_find_expectation(const struct nf_conntrack_tuple *tuple) 
/* delete all expectations for this conntrack */

void nf_ct_remove_expectations(struct nf_conn *ct)

{

	struct nf_conntrack_expect *i, *tmp;

	struct nf_conn_help *help = nfct_help(ct);

	struct nf_conntrack_expect *exp;

	struct hlist_node *n, *next;



	/* Optimization: most connection never expect any others. */

	if (!help || help->expecting == 0)

		return;



	list_for_each_entry_safe(i, tmp, &nf_ct_expect_list, list) {

		if (i->master == ct && del_timer(&i->timeout)) {

			nf_ct_unlink_expect(i);

			nf_ct_expect_put(i);

	hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) {

		if (del_timer(&exp->timeout)) {

			nf_ct_unlink_expect(exp);

			nf_ct_expect_put(exp);

		}

	}

}
@@ -289,9 +288,10 @@ static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) 
	unsigned int h = nf_ct_expect_dst_hash(&exp->tuple);



	atomic_inc(&exp->use);



	hlist_add_head(&exp->lnode, &master_help->expectations);

	master_help->expecting++;



	list_add(&exp->list, &nf_ct_expect_list);

	hlist_add_head(&exp->hnode, &nf_ct_expect_hash[h]);

	nf_ct_expect_count++;
@@ -308,16 +308,16 @@ static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) 
/* Race with expectations being used means we could have none to find; OK. */

static void evict_oldest_expect(struct nf_conn *master)

{

	struct nf_conntrack_expect *i;

	struct nf_conn_help *master_help = nfct_help(master);

	struct nf_conntrack_expect *exp = NULL;

	struct hlist_node *n;



	list_for_each_entry_reverse(i, &nf_ct_expect_list, list) {

		if (i->master == master) {

			if (del_timer(&i->timeout)) {

				nf_ct_unlink_expect(i);

				nf_ct_expect_put(i);

			}

			break;

		}

	hlist_for_each_entry(exp, n, &master_help->expectations, lnode)

		; /* nothing */



	if (exp && del_timer(&exp->timeout)) {

		nf_ct_unlink_expect(exp);

		nf_ct_expect_put(exp);

	}

}