From e730c15519d09ea528b4d2f1103681fa5937c0e6 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 17 Sep 2007 11:53:39 -0700 Subject: [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 Signed-off-by: David S. Miller --- net/packet/af_packet.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'net/packet') diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 766b5faaed2..cae1ee4f2ad 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -252,6 +252,9 @@ static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct 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. @@ -452,6 +455,9 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet 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; @@ -568,6 +574,9 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe 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; -- cgit v1.2.3