diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-09-17 11:53:39 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:49:08 -0700 |
| commit | e730c15519d09ea528b4d2f1103681fa5937c0e6 (patch) | |
| tree | c117294523f4d004fb1d740610b6403e5744cdfc /drivers/net/wan | |
| parent | 6d34b1c27a72d5d1c73c567b2f6b1fde316e0eae (diff) | |
[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 'drivers/net/wan')
| -rw-r--r-- | drivers/net/wan/hdlc.c | 7 | ||||
| -rw-r--r-- | drivers/net/wan/lapbether.c | 3 | ||||
| -rw-r--r-- | drivers/net/wan/syncppp.c | 6 |
3 files changed, 16 insertions, 0 deletions
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); |