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authorEric W. Biederman <ebiederm@xmission.com>2007-09-17 22:53:39 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-11 03:49:08 +0400
commite730c15519d09ea528b4d2f1103681fa5937c0e6 (patch)
treec117294523f4d004fb1d740610b6403e5744cdfc /net/packet/af_packet.c
parent6d34b1c27a72d5d1c73c567b2f6b1fde316e0eae (diff)
downloadlinux-e730c15519d09ea528b4d2f1103681fa5937c0e6.tar.xz
[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>
Diffstat (limited to 'net/packet/af_packet.c')
-rw-r--r--net/packet/af_packet.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 766b5faaed21..cae1ee4f2ad6 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;