summaryrefslogtreecommitdiff
path: root/net/core
diff options
context:
space:
mode:
authorNicolas Dichtel <nicolas.dichtel@6wind.com>2013-06-26 16:11:27 +0200
committerDavid S. Miller <davem@davemloft.net>2013-06-27 22:29:05 -0700
commit621e84d6f373dcb273ebfd772638b8e7dc3c2c48 (patch)
tree55135ee5450006f25cca4f14c8206524f976149b /net/core
parent38ae92dc215e939897f17861d658f882d0eaab0f (diff)
dev: introduce skb_scrub_packet()
The goal of this new function is to perform all needed cleanup before sending an skb into another netns. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/dev.c11
-rw-r--r--net/core/skbuff.c23
2 files changed, 24 insertions, 10 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 722f633926e0..370354a9c5f6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1652,22 +1652,13 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
}
}
- skb_orphan(skb);
-
if (unlikely(!is_skb_forwardable(dev, skb))) {
atomic_long_inc(&dev->rx_dropped);
kfree_skb(skb);
return NET_RX_DROP;
}
- skb->skb_iif = 0;
- skb_dst_drop(skb);
- skb->tstamp.tv64 = 0;
- skb->pkt_type = PACKET_HOST;
+ skb_scrub_packet(skb);
skb->protocol = eth_type_trans(skb, dev);
- skb->mark = 0;
- secpath_reset(skb);
- nf_reset(skb);
- nf_reset_trace(skb);
return netif_rx(skb);
}
EXPORT_SYMBOL_GPL(dev_forward_skb);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 9f73eca29fbe..b1fcb8727e56 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3492,3 +3492,26 @@ bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from,
return true;
}
EXPORT_SYMBOL(skb_try_coalesce);
+
+/**
+ * skb_scrub_packet - scrub an skb before sending it to another netns
+ *
+ * @skb: buffer to clean
+ *
+ * skb_scrub_packet can be used to clean an skb before injecting it in
+ * another namespace. We have to clear all information in the skb that
+ * could impact namespace isolation.
+ */
+void skb_scrub_packet(struct sk_buff *skb)
+{
+ skb_orphan(skb);
+ skb->tstamp.tv64 = 0;
+ skb->pkt_type = PACKET_HOST;
+ skb->skb_iif = 0;
+ skb_dst_drop(skb);
+ skb->mark = 0;
+ secpath_reset(skb);
+ nf_reset(skb);
+ nf_reset_trace(skb);
+}
+EXPORT_SYMBOL_GPL(skb_scrub_packet);