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dev: introduce skb_scrub_packet()

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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>
This commit is contained in:
Nicolas Dichtel 2013-06-26 16:11:27 +02:00 committed by David S. Miller
parent 38ae92dc21
commit 621e84d6f3
3 changed files with 25 additions and 10 deletions
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1
include/linux/skbuff.h
View File

@ -2384,6 +2384,7 @@ extern void skb_split(struct sk_buff *skb,
struct sk_buff *skb1, const u32 len);
extern int skb_shift(struct sk_buff *tgt, struct sk_buff *skb,
int shiftlen);
extern void skb_scrub_packet(struct sk_buff *skb);
extern struct sk_buff *skb_segment(struct sk_buff *skb,
netdev_features_t features);

11
net/core/dev.c
View File

@ -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);

23
net/core/skbuff.c
View File

@ -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);