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netfilter: revert user-space expectation helper support

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This patch partially reverts:
3d058d7 netfilter: rework user-space expectation helper support
that was applied during the 3.2 development cycle.

After this patch, the tree remains just like before patch bc01bef,
that initially added the preliminary infrastructure.

I decided to partially revert this patch because the approach
that I proposed to resolve this problem is broken in NAT setups.
Moreover, a new infrastructure will be submitted for the 3.3.x
development cycle that resolve the existing issues while
providing a neat solution.

Since nobody has been seriously using this infrastructure in
user-space, the removal of this feature should affect any know
FOSS project (to my knowledge).

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-01-15 16:57:12 +01:00
parent 412662d204
commit 9bf04646b0
5 changed files with 4 additions and 27 deletions
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4
include/linux/netfilter/nf_conntrack_common.h
View file

@ -83,10 +83,6 @@ 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 */

3
include/linux/netfilter/xt_CT.h
View file

@ -3,8 +3,7 @@
#include <linux/types.h>
#define XT_CT_NOTRACK 0x1
#define XT_CT_USERSPACE_HELPER 0x2
#define XT_CT_NOTRACK 0x1
struct xt_ct_target_info {
__u16 flags;

12
net/netfilter/nf_conntrack_helper.c
View file

@ -121,18 +121,6 @@ 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;

4
net/netfilter/nf_conntrack_netlink.c
View file

@ -2042,10 +2042,6 @@ 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;

8
net/netfilter/xt_CT.c
View file

@ -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 | XT_CT_USERSPACE_HELPER))
return -EOPNOTSUPP;
if (info->flags & ~XT_CT_NOTRACK)
return -EINVAL;
if (info->flags & XT_CT_NOTRACK) {
ct = nf_ct_untracked_get();
@ -92,9 +92,7 @@ static int xt_ct_tg_check(const struct xt_tgchk_param *par)
GFP_KERNEL))
goto err3;
if (info->flags & XT_CT_USERSPACE_HELPER) {
__set_bit(IPS_USERSPACE_HELPER_BIT, &ct->status);
} else if (info->helper[0]) {
if (info->helper[0]) {
ret = -ENOENT;
proto = xt_ct_find_proto(par);
if (!proto) {