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authorPablo Neira Ayuso <pablo@netfilter.org>2012-12-20 01:54:51 +0000
committerPablo Neira Ayuso <pablo@netfilter.org>2012-12-24 12:55:09 +0100
commit10db9069eb5c60195170a4119bdbcbce69a4945f (patch)
tree4ba585b7e16c265365751c57eeb17015351e77db /net
parente035edd16ee83498cccc9beedfc215e15cab3a07 (diff)
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netfilter: xt_CT: recover NOTRACK target support
Florian Westphal reported that the removal of the NOTRACK target (9655050 netfilter: remove xt_NOTRACK) is breaking some existing setups. That removal was scheduled for removal since long time ago as described in Documentation/feature-removal-schedule.txt What: xt_NOTRACK Files: net/netfilter/xt_NOTRACK.c When: April 2011 Why: Superseded by xt_CT Still, people may have not notice / may have decided to stick to an old iptables version. I agree with him in that some more conservative approach by spotting some printk to warn users for some time is less agressive. Current iptables 1.4.16.3 already contains the aliasing support that makes it point to the CT target, so upgrading would fix it. Still, the policy so far has been to avoid pushing our users to upgrade. As a solution, this patch recovers the NOTRACK target inside the CT target and it now spots a warning. Reported-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/Kconfig4
-rw-r--r--net/netfilter/xt_CT.c50
2 files changed, 53 insertions, 1 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index fefa514b9917..390f96cc8ed4 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -680,6 +680,10 @@ config NETFILTER_XT_TARGET_NFQUEUE
To compile it as a module, choose M here. If unsure, say N.
+config NETFILTER_XT_TARGET_NOTRACK
+ tristate '"NOTRACK" target support (DEPRECATED)'
+ select NETFILTER_XT_TARGET_CT
+
config NETFILTER_XT_TARGET_RATEEST
tristate '"RATEEST" target support'
depends on NETFILTER_ADVANCED
diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c
index 1668f41acc6e..2a0843081840 100644
--- a/net/netfilter/xt_CT.c
+++ b/net/netfilter/xt_CT.c
@@ -385,14 +385,60 @@ static struct xt_target xt_ct_tg_reg[] __read_mostly = {
},
};
+static unsigned int
+notrack_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ /* Previously seen (loopback)? Ignore. */
+ if (skb->nfct != NULL)
+ return XT_CONTINUE;
+
+ skb->nfct = &nf_ct_untracked_get()->ct_general;
+ skb->nfctinfo = IP_CT_NEW;
+ nf_conntrack_get(skb->nfct);
+
+ return XT_CONTINUE;
+}
+
+static int notrack_chk(const struct xt_tgchk_param *par)
+{
+ if (!par->net->xt.notrack_deprecated_warning) {
+ pr_info("netfilter: NOTRACK target is deprecated, "
+ "use CT instead or upgrade iptables\n");
+ par->net->xt.notrack_deprecated_warning = true;
+ }
+ return 0;
+}
+
+static struct xt_target notrack_tg_reg __read_mostly = {
+ .name = "NOTRACK",
+ .revision = 0,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = notrack_chk,
+ .target = notrack_tg,
+ .table = "raw",
+ .me = THIS_MODULE,
+};
+
static int __init xt_ct_tg_init(void)
{
- return xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
+ int ret;
+
+ ret = xt_register_target(&notrack_tg_reg);
+ if (ret < 0)
+ return ret;
+
+ ret = xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
+ if (ret < 0) {
+ xt_unregister_target(&notrack_tg_reg);
+ return ret;
+ }
+ return 0;
}
static void __exit xt_ct_tg_exit(void)
{
xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
+ xt_unregister_target(&notrack_tg_reg);
}
module_init(xt_ct_tg_init);
@@ -402,3 +448,5 @@ MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Xtables: connection tracking target");
MODULE_ALIAS("ipt_CT");
MODULE_ALIAS("ip6t_CT");
+MODULE_ALIAS("ipt_NOTRACK");
+MODULE_ALIAS("ip6t_NOTRACK");