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-rw-r--r--include/linux/netfilter/nf_conntrack_common.h4
-rw-r--r--include/linux/netfilter/xt_CT.h3
-rw-r--r--include/net/netfilter/nf_conntrack_expect.h1
-rw-r--r--net/netfilter/nf_conntrack_expect.c63
-rw-r--r--net/netfilter/nf_conntrack_helper.c12
-rw-r--r--net/netfilter/nf_conntrack_netlink.c5
-rw-r--r--net/netfilter/xt_CT.c8
7 files changed, 48 insertions, 48 deletions
diff --git a/include/linux/netfilter/nf_conntrack_common.h b/include/linux/netfilter/nf_conntrack_common.h
index 0d3dd66..9e3a283 100644
--- a/include/linux/netfilter/nf_conntrack_common.h
+++ b/include/linux/netfilter/nf_conntrack_common.h
@@ -83,6 +83,10 @@ enum ip_conntrack_status {
/* Conntrack is a fake untracked entry */
IPS_UNTRACKED_BIT = 12,
IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
+
+ /* Conntrack has a userspace helper. */
+ IPS_USERSPACE_HELPER_BIT = 13,
+ IPS_USERSPACE_HELPER = (1 << IPS_USERSPACE_HELPER_BIT),
};
/* Connection tracking event types */
diff --git a/include/linux/netfilter/xt_CT.h b/include/linux/netfilter/xt_CT.h
index b56e768..6390f09 100644
--- a/include/linux/netfilter/xt_CT.h
+++ b/include/linux/netfilter/xt_CT.h
@@ -3,7 +3,8 @@
#include <linux/types.h>
-#define XT_CT_NOTRACK 0x1
+#define XT_CT_NOTRACK 0x1
+#define XT_CT_USERSPACE_HELPER 0x2
struct xt_ct_target_info {
__u16 flags;
diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index 0f8a8c5..4619caa 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h
@@ -91,7 +91,6 @@ static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
void nf_ct_remove_expectations(struct nf_conn *ct);
void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
-void nf_ct_remove_userspace_expectations(void);
/* Allocate space for an expectation: this is mandatory before calling
nf_ct_expect_related. You will have to call put afterwards. */
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index 340c80d..bebb167 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -38,8 +38,6 @@ unsigned int nf_ct_expect_max __read_mostly;
static struct kmem_cache *nf_ct_expect_cachep __read_mostly;
-static HLIST_HEAD(nf_ct_userspace_expect_list);
-
/* nf_conntrack_expect helper functions */
void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
u32 pid, int report)
@@ -47,14 +45,14 @@ void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
struct nf_conn_help *master_help = nfct_help(exp->master);
struct net *net = nf_ct_exp_net(exp);
+ NF_CT_ASSERT(master_help);
NF_CT_ASSERT(!timer_pending(&exp->timeout));
hlist_del_rcu(&exp->hnode);
net->ct.expect_count--;
hlist_del(&exp->lnode);
- if (!(exp->flags & NF_CT_EXPECT_USERSPACE))
- master_help->expecting[exp->class]--;
+ master_help->expecting[exp->class]--;
nf_ct_expect_event_report(IPEXP_DESTROY, exp, pid, report);
nf_ct_expect_put(exp);
@@ -314,37 +312,34 @@ void nf_ct_expect_put(struct nf_conntrack_expect *exp)
}
EXPORT_SYMBOL_GPL(nf_ct_expect_put);
-static void nf_ct_expect_insert(struct nf_conntrack_expect *exp)
+static int nf_ct_expect_insert(struct nf_conntrack_expect *exp)
{
struct nf_conn_help *master_help = nfct_help(exp->master);
+ struct nf_conntrack_helper *helper;
struct net *net = nf_ct_exp_net(exp);
- const struct nf_conntrack_expect_policy *p;
unsigned int h = nf_ct_expect_dst_hash(&exp->tuple);
/* two references : one for hash insert, one for the timer */
atomic_add(2, &exp->use);
- if (master_help) {
- hlist_add_head(&exp->lnode, &master_help->expectations);
- master_help->expecting[exp->class]++;
- } else if (exp->flags & NF_CT_EXPECT_USERSPACE)
- hlist_add_head(&exp->lnode, &nf_ct_userspace_expect_list);
+ hlist_add_head(&exp->lnode, &master_help->expectations);
+ master_help->expecting[exp->class]++;
hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]);
net->ct.expect_count++;
setup_timer(&exp->timeout, nf_ct_expectation_timed_out,
(unsigned long)exp);
- if (master_help) {
- p = &rcu_dereference_protected(
- master_help->helper,
- lockdep_is_held(&nf_conntrack_lock)
- )->expect_policy[exp->class];
- exp->timeout.expires = jiffies + p->timeout * HZ;
+ helper = rcu_dereference_protected(master_help->helper,
+ lockdep_is_held(&nf_conntrack_lock));
+ if (helper) {
+ exp->timeout.expires = jiffies +
+ helper->expect_policy[exp->class].timeout * HZ;
}
add_timer(&exp->timeout);
NF_CT_STAT_INC(net, expect_create);
+ return 0;
}
/* Race with expectations being used means we could have none to find; OK. */
@@ -389,14 +384,13 @@ static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect)
struct nf_conntrack_expect *i;
struct nf_conn *master = expect->master;
struct nf_conn_help *master_help = nfct_help(master);
+ struct nf_conntrack_helper *helper;
struct net *net = nf_ct_exp_net(expect);
struct hlist_node *n;
unsigned int h;
int ret = 1;
- /* Don't allow expectations created from kernel-space with no helper */
- if (!(expect->flags & NF_CT_EXPECT_USERSPACE) &&
- (!master_help || (master_help && !master_help->helper))) {
+ if (!master_help) {
ret = -ESHUTDOWN;
goto out;
}
@@ -414,11 +408,10 @@ static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect)
}
}
/* Will be over limit? */
- if (master_help) {
- p = &rcu_dereference_protected(
- master_help->helper,
- lockdep_is_held(&nf_conntrack_lock)
- )->expect_policy[expect->class];
+ helper = rcu_dereference_protected(master_help->helper,
+ lockdep_is_held(&nf_conntrack_lock));
+ if (helper) {
+ p = &helper->expect_policy[expect->class];
if (p->max_expected &&
master_help->expecting[expect->class] >= p->max_expected) {
evict_oldest_expect(master, expect);
@@ -450,8 +443,9 @@ int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
if (ret <= 0)
goto out;
- ret = 0;
- nf_ct_expect_insert(expect);
+ ret = nf_ct_expect_insert(expect);
+ if (ret < 0)
+ goto out;
spin_unlock_bh(&nf_conntrack_lock);
nf_ct_expect_event_report(IPEXP_NEW, expect, pid, report);
return ret;
@@ -461,21 +455,6 @@ out:
}
EXPORT_SYMBOL_GPL(nf_ct_expect_related_report);
-void nf_ct_remove_userspace_expectations(void)
-{
- struct nf_conntrack_expect *exp;
- struct hlist_node *n, *next;
-
- hlist_for_each_entry_safe(exp, n, next,
- &nf_ct_userspace_expect_list, lnode) {
- if (del_timer(&exp->timeout)) {
- nf_ct_unlink_expect(exp);
- nf_ct_expect_put(exp);
- }
- }
-}
-EXPORT_SYMBOL_GPL(nf_ct_remove_userspace_expectations);
-
#ifdef CONFIG_PROC_FS
struct ct_expect_iter_state {
struct seq_net_private p;
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 93c4bdb..c9e0de0 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -121,6 +121,18 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
int ret = 0;
if (tmpl != NULL) {
+ /* we've got a userspace helper. */
+ if (tmpl->status & IPS_USERSPACE_HELPER) {
+ help = nf_ct_helper_ext_add(ct, flags);
+ if (help == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ rcu_assign_pointer(help->helper, NULL);
+ __set_bit(IPS_USERSPACE_HELPER_BIT, &ct->status);
+ ret = 0;
+ goto out;
+ }
help = nfct_help(tmpl);
if (help != NULL)
helper = help->helper;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 636617c..7395480 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -2040,6 +2040,10 @@ ctnetlink_create_expect(struct net *net, u16 zone,
}
help = nfct_help(ct);
if (!help) {
+ err = -EOPNOTSUPP;
+ goto out;
+ }
+ if (test_bit(IPS_USERSPACE_HELPER_BIT, &ct->status)) {
if (!cda[CTA_EXPECT_TIMEOUT]) {
err = -EINVAL;
goto out;
@@ -2264,7 +2268,6 @@ static void __exit ctnetlink_exit(void)
{
pr_info("ctnetlink: unregistering from nfnetlink.\n");
- nf_ct_remove_userspace_expectations();
unregister_pernet_subsys(&ctnetlink_net_ops);
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
nfnetlink_subsys_unregister(&ctnl_subsys);
diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c
index 0221d10..8e87123 100644
--- a/net/netfilter/xt_CT.c
+++ b/net/netfilter/xt_CT.c
@@ -62,8 +62,8 @@ static int xt_ct_tg_check(const struct xt_tgchk_param *par)
int ret = 0;
u8 proto;
- if (info->flags & ~XT_CT_NOTRACK)
- return -EINVAL;
+ if (info->flags & ~(XT_CT_NOTRACK | XT_CT_USERSPACE_HELPER))
+ return -EOPNOTSUPP;
if (info->flags & XT_CT_NOTRACK) {
ct = nf_ct_untracked_get();
@@ -92,7 +92,9 @@ static int xt_ct_tg_check(const struct xt_tgchk_param *par)
GFP_KERNEL))
goto err3;
- if (info->helper[0]) {
+ if (info->flags & XT_CT_USERSPACE_HELPER) {
+ __set_bit(IPS_USERSPACE_HELPER_BIT, &ct->status);
+ } else if (info->helper[0]) {
ret = -ENOENT;
proto = xt_ct_find_proto(par);
if (!proto) {
generated by cgit v1.1 at 2024-12-27 19:33:59 +0000