netfilter: physdev: relax br_netfilter dependency

Following command:
  iptables -D FORWARD -m physdev ...
causes connectivity loss in some setups.

Reason is that iptables userspace will probe kernel for the module revision
of the physdev patch, and physdev has an artificial dependency on
br_netfilter (xt_physdev use makes no sense unless a br_netfilter module
is loaded).

This causes the "phydev" module to be loaded, which in turn enables the
"call-iptables" infrastructure.

bridged packets might then get dropped by the iptables ruleset.

The better fix would be to change the "call-iptables" defaults to 0 and
enforce explicit setting to 1, but that breaks backwards compatibility.

This does the next best thing: add a request_module call to checkentry.
This was a stray '-D ... -m physdev' won't activate br_netfilter
anymore.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/net/netfilter/br_netfilter.h b/include/net/netfilter/br_netfilter.h
index 4cd56808ac4e143bda84c888000fd527b44e9217..89808ce293c411f272566cc8370fe8e82226e9f1 100644 (file)
--- a/include/net/netfilter/br_netfilter.h
+++ b/include/net/netfilter/br_netfilter.h
@@ -43,7 +43,6 @@ static inline struct rtable *bridge_parent_rtable(const struct net_device *dev)
 }
 
 struct net_device *setup_pre_routing(struct sk_buff *skb);
-void br_netfilter_enable(void);
 
 #if IS_ENABLED(CONFIG_IPV6)
 int br_validate_ipv6(struct net *net, struct sk_buff *skb);

diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index c93c35bb73ddeda8b6d0056016c30846674299fc..40d058378b521d8947284a0a0ec19c65e331e08e 100644 (file)
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -881,11 +881,6 @@ static const struct nf_br_ops br_ops = {
        .br_dev_xmit_hook =     br_nf_dev_xmit,
 };
 
-void br_netfilter_enable(void)
-{
-}
-EXPORT_SYMBOL_GPL(br_netfilter_enable);
-
 /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because
  * br_dev_queue_push_xmit is called afterwards */
 static const struct nf_hook_ops br_nf_ops[] = {

diff --git a/net/netfilter/xt_physdev.c b/net/netfilter/xt_physdev.c
index 4034d70bff3948e970c61ccc02a5e22399c67ac4..b2e39cb6a590b23d3a3dabe472d385ab74c66dd8 100644 (file)
--- a/net/netfilter/xt_physdev.c
+++ b/net/netfilter/xt_physdev.c
@@ -96,8 +96,7 @@ match_outdev:
 static int physdev_mt_check(const struct xt_mtchk_param *par)
 {
        const struct xt_physdev_info *info = par->matchinfo;
-
-       br_netfilter_enable();
+       static bool brnf_probed __read_mostly;
 
        if (!(info->bitmask & XT_PHYSDEV_OP_MASK) ||
            info->bitmask & ~XT_PHYSDEV_OP_MASK)
@@ -111,6 +110,12 @@ static int physdev_mt_check(const struct xt_mtchk_param *par)
                if (par->hook_mask & (1 << NF_INET_LOCAL_OUT))
                        return -EINVAL;
        }
+
+       if (!brnf_probed) {
+               brnf_probed = true;
+               request_module("br_netfilter");
+       }
+
        return 0;
 }