[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 <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/block/aoe/aoenet.c

···
 #include <linux/blkdev.h>
 #include <linux/netdevice.h>
 #include <linux/moduleparam.h>
+#include <net/net_namespace.h>
 #include <asm/unaligned.h>
 #include "aoe.h"
 
···
 {
 	struct aoe_hdr *h;
 	u32 n;
+
+	if (ifp->nd_net != &init_net)
+		goto exit;
 
 	skb = skb_share_check(skb, GFP_ATOMIC);
 	if (skb == NULL)

drivers/net/bonding/bond_3ad.c

···
 #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"
 
···
 	struct bonding *bond = dev->priv;
 	struct slave *slave = NULL;
 	int ret = NET_RX_DROP;
+
+	if (dev->nd_net != &init_net)
+		goto out;
 
 	if (!(dev->flags & IFF_MASTER))
 		goto out;

drivers/net/bonding/bond_alb.c

···
 	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;
 

drivers/net/bonding/bond_main.c

···
 	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;
 

drivers/net/hamradio/bpqether.c

···
 	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;
 

drivers/net/pppoe.c

···
 	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;
 
···
 {
 	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;

drivers/net/wan/hdlc.c

···
 #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";
···
 		    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);
 

drivers/net/wan/lapbether.c

···
 	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;
 

drivers/net/wan/syncppp.c

···
 #include <linux/spinlock.h>
 #include <linux/rcupdate.h>
 
+#include <net/net_namespace.h>
 #include <net/syncppp.h>
 
 #include <asm/byteorder.h>
···
 
 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);

net/8021q/vlan_dev.c

···
 	unsigned short vlan_TCI;
 	__be16 proto;
 
+	if (dev->nd_net != &init_net) {
+		kfree_skb(skb);
+		return -1;
+	}
+
 	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 		return -1;
 

net/appletalk/aarp.c

···
 	struct atalk_addr sa, *ma, da;
 	struct atalk_iface *ifa;
 
+	if (dev->nd_net != &init_net)
+		goto out0;
+
 	/* We only do Ethernet SNAP AARP. */
 	if (dev->type != ARPHRD_ETHER)
 		goto out0;

net/appletalk/ddp.c

···
 	int origlen;
 	__u16 len_hops;
 
+	if (dev->nd_net != &init_net)
+		goto freeit;
+
 	/* Don't mangle buffer if shared */
 	if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
 		goto out;
···
 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
 		     struct packet_type *pt, struct net_device *orig_dev)
 {
+	if (dev->nd_net != &init_net)
+		goto freeit;
+
 	/* Expand any short form frames */
 	if (skb_mac_header(skb)[2] == 1) {
 		struct ddpehdr *ddp;

net/ax25/ax25_in.c

···
 	skb->sk = NULL;		/* Initially we don't know who it's for */
 	skb->destructor = NULL;	/* Who initializes this, dammit?! */
 
+	if (dev->nd_net != &init_net) {
+		kfree_skb(skb);
+		return 0;
+	}
+
 	if ((*skb->data & 0x0F) != 0) {
 		kfree_skb(skb);	/* Not a KISS data frame */
 		return 0;

net/bridge/br_stp_bpdu.c

···
 #include <linux/netfilter_bridge.h>
 #include <linux/etherdevice.h>
 #include <linux/llc.h>
+#include <net/net_namespace.h>
 #include <net/llc.h>
 #include <net/llc_pdu.h>
 #include <asm/unaligned.h>
···
 	struct net_bridge_port *p = rcu_dereference(dev->br_port);
 	struct net_bridge *br;
 	const unsigned char *buf;
+
+	if (dev->nd_net != &init_net)
+		goto err;
 
 	if (!p)
 		goto err;

net/decnet/dn_route.c

···
 	struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
 	unsigned char padlen = 0;
 
+	if (dev->nd_net != &init_net)
+		goto dump_it;
+
 	if (dn == NULL)
 		goto dump_it;
 

net/econet/af_econet.c

···
 	struct sock *sk;
 	struct ec_device *edev = dev->ec_ptr;
 
+	if (dev->nd_net != &init_net)
+		goto drop;
+
 	if (skb->pkt_type == PACKET_OTHERHOST)
 		goto drop;
 

net/ipv4/arp.c

···
 {
 	struct arphdr *arp;
 
+	if (dev->nd_net != &init_net)
+		goto freeskb;
+
 	/* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
 	if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
 				 (2 * dev->addr_len) +

net/ipv4/ip_input.c

···
 	struct iphdr *iph;
 	u32 len;
 
+	if (dev->nd_net != &init_net)
+		goto drop;
+
 	/* When the interface is in promisc. mode, drop all the crap
 	 * that it receives, do not try to analyse it.
 	 */

net/ipv4/ipconfig.c

···
 	unsigned char *sha, *tha;		/* s for "source", t for "target" */
 	struct ic_device *d;
 
+	if (dev->nd_net != &init_net)
+		goto drop;
+
 	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 		return NET_RX_DROP;
 
···
 	struct iphdr *h;
 	struct ic_device *d;
 	int len, ext_len;
+
+	if (dev->nd_net != &init_net)
+		goto drop;
 
 	/* Perform verifications before taking the lock.  */
 	if (skb->pkt_type == PACKET_OTHERHOST)

net/ipv6/ip6_input.c

···
 	u32 		pkt_len;
 	struct inet6_dev *idev;
 
+	if (dev->nd_net != &init_net) {
+		kfree_skb(skb);
+		return 0;
+	}
+
 	if (skb->pkt_type == PACKET_OTHERHOST) {
 		kfree_skb(skb);
 		return 0;

net/ipx/af_ipx.c

···
 	u16 ipx_pktsize;
 	int rc = 0;
 
+	if (dev->nd_net != &init_net)
+		goto drop;
+
 	/* Not ours */
 	if (skb->pkt_type == PACKET_OTHERHOST)
 		goto drop;

net/irda/irlap_frame.c

···
 	int command;
 	__u8 control;
 
+	if (dev->nd_net != &init_net)
+		goto out;
+
 	/* FIXME: should we get our own field? */
 	self = (struct irlap_cb *) dev->atalk_ptr;
 

net/llc/llc_input.c

···
  * See the GNU General Public License for more details.
  */
 #include <linux/netdevice.h>
+#include <net/net_namespace.h>
 #include <net/llc.h>
 #include <net/llc_pdu.h>
 #include <net/llc_sap.h>
···
 	int dest;
 	int (*rcv)(struct sk_buff *, struct net_device *,
 		   struct packet_type *, struct net_device *);
+
+	if (dev->nd_net != &init_net)
+		goto drop;
 
 	/*
 	 * When the interface is in promisc. mode, drop all the crap that it

net/packet/af_packet.c

···
 	struct sock *sk;
 	struct sockaddr_pkt *spkt;
 
+	if (dev->nd_net != &init_net)
+		goto out;
+
 	/*
 	 *	When we registered the protocol we saved the socket in the data
 	 *	field for just this event.
···
 	int skb_len = skb->len;
 	unsigned int snaplen, res;
 
+	if (dev->nd_net != &init_net)
+		goto drop;
+
 	if (skb->pkt_type == PACKET_LOOPBACK)
 		goto drop;
 
···
 	unsigned short macoff, netoff;
 	struct sk_buff *copy_skb = NULL;
 	struct timeval tv;
+
+	if (dev->nd_net != &init_net)
+		goto drop;
 
 	if (skb->pkt_type == PACKET_LOOPBACK)
 		goto drop;

net/tipc/eth_media.c

···
 #include <net/tipc/tipc_bearer.h>
 #include <net/tipc/tipc_msg.h>
 #include <linux/netdevice.h>
+#include <net/net_namespace.h>
 
 #define MAX_ETH_BEARERS		2
 #define ETH_LINK_PRIORITY	TIPC_DEF_LINK_PRI
···
 {
 	struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
 	u32 size;
+
+	if (dev->nd_net != &init_net) {
+		kfree_skb(buf);
+		return 0;
+	}
 
 	if (likely(eb_ptr->bearer)) {
 		if (likely(buf->pkt_type <= PACKET_BROADCAST)) {

net/x25/x25_dev.c

···
 	struct sk_buff *nskb;
 	struct x25_neigh *nb;
 
+	if (dev->nd_net != &init_net)
+		goto drop;
+
 	nskb = skb_copy(skb, GFP_ATOMIC);
 	if (!nskb)
 		goto drop;