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skb: allow skb_scrub_packet() to be used by tunnels 

This function was only used when a packet was sent to another netns. Now, it can
also be used after tunnel encapsulation or decapsulation.

Only skb_orphan() should not be done when a packet is not crossing 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 2013-09-02 15:34:56 +02:00 committed by David S. Miller
parent 117961878c
commit 8b27f27797
6 changed files with 19 additions and 14 deletions
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2
include/linux/skbuff.h
View File

@ -2392,7 +2392,7 @@ 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 void skb_scrub_packet(struct sk_buff *skb, bool xnet);
extern struct sk_buff *skb_segment(struct sk_buff *skb,
netdev_features_t features);

2
net/core/dev.c
View File

@ -1697,7 +1697,7 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
* call skb_scrub_packet() after it to clear pkt_type _after_ calling
* eth_type_trans().
*/
skb_scrub_packet(skb);
skb_scrub_packet(skb, true);
return netif_rx(skb);
}

17
net/core/skbuff.c
View File

@ -3500,17 +3500,22 @@ bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from,
EXPORT_SYMBOL(skb_try_coalesce);
/**
* skb_scrub_packet - scrub an skb before sending it to another netns
* skb_scrub_packet - scrub an skb
*
* @skb: buffer to clean
* @xnet: packet is crossing netns
*
* 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.
* skb_scrub_packet can be used after encapsulating or decapsulting a packet
* into/from a tunnel. Some information have to be cleared during these
* operations.
* skb_scrub_packet can also be used to clean a skb before injecting it in
* another namespace (@xnet == true). We have to clear all information in the
* skb that could impact namespace isolation.
*/
void skb_scrub_packet(struct sk_buff *skb)
void skb_scrub_packet(struct sk_buff *skb, bool xnet)
{
skb_orphan(skb);
if (xnet)
skb_orphan(skb);
skb->tstamp.tv64 = 0;
skb->pkt_type = PACKET_HOST;
skb->skb_iif = 0;

4
net/ipv4/ip_tunnel.c
View File

@ -462,7 +462,7 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
}
if (!net_eq(tunnel->net, dev_net(tunnel->dev)))
skb_scrub_packet(skb);
skb_scrub_packet(skb, true);
gro_cells_receive(&tunnel->gro_cells, skb);
return 0;
@ -615,7 +615,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
}
if (!net_eq(tunnel->net, dev_net(dev)))
skb_scrub_packet(skb);
skb_scrub_packet(skb, true);
if (tunnel->err_count > 0) {
if (time_before(jiffies,

4
net/ipv6/ip6_tunnel.c
View File

@ -830,7 +830,7 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
tstats->rx_bytes += skb->len;
if (!net_eq(t->net, dev_net(t->dev)))
skb_scrub_packet(skb);
skb_scrub_packet(skb, true);
netif_rx(skb);
@ -1002,7 +1002,7 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
}
if (!net_eq(t->net, dev_net(dev)))
skb_scrub_packet(skb);
skb_scrub_packet(skb, true);
/*
* Okay, now see if we can stuff it in the buffer as-is.

4
net/ipv6/sit.c
View File

@ -622,7 +622,7 @@ static int ipip6_rcv(struct sk_buff *skb)
tstats->rx_bytes += skb->len;
if (!net_eq(tunnel->net, dev_net(tunnel->dev)))
skb_scrub_packet(skb);
skb_scrub_packet(skb, true);
netif_rx(skb);
return 0;
@ -861,7 +861,7 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
}
if (!net_eq(tunnel->net, dev_net(dev)))
skb_scrub_packet(skb);
skb_scrub_packet(skb, true);
/*
* Okay, now see if we can stuff it in the buffer as-is.