[NET]: Make packet reception network namespace safe

This patch modifies every packet receive function
registered with dev_add_pack() to drop packets if they
are not from the initial network namespace.

This should ensure that the various network stacks do
not receive packets in a anything but the initial network
namespace until the code has been converted and is ready
for them.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 35 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index f829e4ad8b49..94bd73941451 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -29,6 +29,7 @@
 #include <linux/ethtool.h>
 #include <linux/if_bonding.h>
 #include <linux/pkt_sched.h>
+#include <net/net_namespace.h>
 #include "bonding.h"
 #include "bond_3ad.h"
 
@@ -2448,6 +2449,9 @@ int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct pac
         struct slave *slave = NULL;
         int ret = NET_RX_DROP;
 
+        if (dev->nd_net != &init_net)
+                goto out;
+
         if (!(dev->flags & IFF_MASTER))
                 goto out;
 
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 92c3b6f6a8e7..419a9f8fdd53 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -345,6 +345,9 @@ static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct
         struct arp_pkt *arp = (struct arp_pkt *)skb->data;
         int res = NET_RX_DROP;
 
+        if (bond_dev->nd_net != &init_net)
+                goto out;
+
         if (!(bond_dev->flags & IFF_MASTER))
                 goto out;
 
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 5de648f90a45..e4e5fdc0430b 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2458,6 +2458,9 @@ static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct pack
         unsigned char *arp_ptr;
         u32 sip, tip;
 
+        if (dev->nd_net != &init_net)
+                goto out;
+
         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
                 goto out;
 
diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
index 1699d42d13ca..85fb8e7efacf 100644
--- a/drivers/net/hamradio/bpqether.c
+++ b/drivers/net/hamradio/bpqether.c
@@ -173,6 +173,9 @@ static int bpq_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_ty
         struct ethhdr *eth;
         struct bpqdev *bpq;
 
+        if (dev->nd_net != &init_net)
+                goto drop;
+
         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
                 return NET_RX_DROP;
 
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index 53fcee26d6ae..60c0e4e17875 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -389,6 +389,9 @@ static int pppoe_rcv(struct sk_buff *skb,
         if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
                 goto out;
 
+        if (dev->nd_net != &init_net)
+                goto drop;
+
         if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
                 goto drop;
 
@@ -418,6 +421,9 @@ static int pppoe_disc_rcv(struct sk_buff *skb,
         struct pppoe_hdr *ph;
         struct pppox_sock *po;
 
+        if (dev->nd_net != &init_net)
+                goto abort;
+
         if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
                 goto abort;
 
diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c
index 65ad2e24caf0..3b57350eacca 100644
--- a/drivers/net/wan/hdlc.c
+++ b/drivers/net/wan/hdlc.c
@@ -36,6 +36,7 @@
 #include <linux/rtnetlink.h>
 #include <linux/notifier.h>
 #include <linux/hdlc.h>
+#include <net/net_namespace.h>
 
 
 static const char* version = "HDLC support module revision 1.21";
@@ -66,6 +67,12 @@ static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
                     struct packet_type *p, struct net_device *orig_dev)
 {
         struct hdlc_device_desc *desc = dev_to_desc(dev);
+
+        if (dev->nd_net != &init_net) {
+                kfree_skb(skb);
+                return 0;
+        }
+
         if (desc->netif_rx)
                 return desc->netif_rx(skb);
 
diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c
index 6c302e9dbca2..ca8b3c3cb931 100644
--- a/drivers/net/wan/lapbether.c
+++ b/drivers/net/wan/lapbether.c
@@ -91,6 +91,9 @@ static int lapbeth_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
         int len, err;
         struct lapbethdev *lapbeth;
 
+        if (dev->nd_net != &init_net)
+                goto drop;
+
         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
                 return NET_RX_DROP;
 
diff --git a/drivers/net/wan/syncppp.c b/drivers/net/wan/syncppp.c
index 67fc67cfd452..5c71af6ea3a5 100644
--- a/drivers/net/wan/syncppp.c
+++ b/drivers/net/wan/syncppp.c
@@ -51,6 +51,7 @@
 #include <linux/spinlock.h>
 #include <linux/rcupdate.h>
 
+#include <net/net_namespace.h>
 #include <net/syncppp.h>
 
 #include <asm/byteorder.h>
@@ -1445,6 +1446,11 @@ static void sppp_print_bytes (u_char *p, u16 len)
 
 static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p, struct net_device *orig_dev)
 {
+        if (dev->nd_net != &init_net) {
+                kfree_skb(skb);
+                return 0;
+        }
+
         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
                 return NET_RX_DROP;
         sppp_input(dev,skb);