net: Make AF_PACKET handle multiple network namespaces

This is done by making packet_sklist_lock and packet_sklist per network namespace and adding an additional filter condition on received packets to ensure they came from the proper network namespace.

Changes from v1:
- prohibit to call inet_dgram_ops.ioctl in other than init_net

---
 include/net/net_namespace.h |    4 +
 net/packet/af_packet.c      |  131 ++++++++++++++++++++++++++++---------------
 2 files changed, 89 insertions(+), 46 deletions(-)

index 90802a6..4d0d634 100644
@@ -32,6 +32,10 @@ struct net {
 	struct hlist_head	*dev_index_head;
 
 	struct sock 		*rtnl;			/* rtnetlink socket */
+
+	/* List of all packet sockets. */
+	rwlock_t		packet_sklist_lock;
+	struct hlist_head	packet_sklist;
 };
 
 #ifdef CONFIG_NET

1.5.3.rc5

From: "Denis V. Lunev" <[email protected]>
Date: Thu, 15 Nov 2007 18:59:54 +0300

Applied.