Commit 09b8f7a9 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[IPSEC]: Handle GSO packets



This patch segments GSO packets received by the IPsec stack.  This can
happen when a NIC driver injects GSO packets into the stack which are
then forwarded to another host.

The primary application of this is going to be Xen where its backend
driver may inject GSO packets into dom0.

Of course this also can be used by other virtualisation schemes such as
VMWare or UML since the tap device could be modified to inject GSO packets
received through splice.
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 37c3185a
......@@ -9,6 +9,8 @@
*/
#include <linux/compiler.h>
#include <linux/if_ether.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/netfilter_ipv4.h>
......@@ -97,16 +99,10 @@ error_nolock:
goto out_exit;
}
static int xfrm4_output_finish(struct sk_buff *skb)
static int xfrm4_output_finish2(struct sk_buff *skb)
{
int err;
#ifdef CONFIG_NETFILTER
if (!skb->dst->xfrm) {
IPCB(skb)->flags |= IPSKB_REROUTED;
return dst_output(skb);
}
#endif
while (likely((err = xfrm4_output_one(skb)) == 0)) {
nf_reset(skb);
......@@ -119,7 +115,7 @@ static int xfrm4_output_finish(struct sk_buff *skb)
return dst_output(skb);
err = nf_hook(PF_INET, NF_IP_POST_ROUTING, &skb, NULL,
skb->dst->dev, xfrm4_output_finish);
skb->dst->dev, xfrm4_output_finish2);
if (unlikely(err != 1))
break;
}
......@@ -127,6 +123,48 @@ static int xfrm4_output_finish(struct sk_buff *skb)
return err;
}
static int xfrm4_output_finish(struct sk_buff *skb)
{
struct sk_buff *segs;
#ifdef CONFIG_NETFILTER
if (!skb->dst->xfrm) {
IPCB(skb)->flags |= IPSKB_REROUTED;
return dst_output(skb);
}
#endif
if (!skb_shinfo(skb)->gso_size)
return xfrm4_output_finish2(skb);
skb->protocol = htons(ETH_P_IP);
segs = skb_gso_segment(skb, 0);
kfree_skb(skb);
if (unlikely(IS_ERR(segs)))
return PTR_ERR(segs);
do {
struct sk_buff *nskb = segs->next;
int err;
segs->next = NULL;
err = xfrm4_output_finish2(segs);
if (unlikely(err)) {
while ((segs = nskb)) {
nskb = segs->next;
segs->next = NULL;
kfree_skb(segs);
}
return err;
}
segs = nskb;
} while (segs);
return 0;
}
int xfrm4_output(struct sk_buff *skb)
{
return NF_HOOK_COND(PF_INET, NF_IP_POST_ROUTING, skb, NULL, skb->dst->dev,
......
......@@ -94,7 +94,7 @@ error_nolock:
goto out_exit;
}
static int xfrm6_output_finish(struct sk_buff *skb)
static int xfrm6_output_finish2(struct sk_buff *skb)
{
int err;
......@@ -110,7 +110,7 @@ static int xfrm6_output_finish(struct sk_buff *skb)
return dst_output(skb);
err = nf_hook(PF_INET6, NF_IP6_POST_ROUTING, &skb, NULL,
skb->dst->dev, xfrm6_output_finish);
skb->dst->dev, xfrm6_output_finish2);
if (unlikely(err != 1))
break;
}
......@@ -118,6 +118,41 @@ static int xfrm6_output_finish(struct sk_buff *skb)
return err;
}
static int xfrm6_output_finish(struct sk_buff *skb)
{
struct sk_buff *segs;
if (!skb_shinfo(skb)->gso_size)
return xfrm6_output_finish2(skb);
skb->protocol = htons(ETH_P_IP);
segs = skb_gso_segment(skb, 0);
kfree_skb(skb);
if (unlikely(IS_ERR(segs)))
return PTR_ERR(segs);
do {
struct sk_buff *nskb = segs->next;
int err;
segs->next = NULL;
err = xfrm6_output_finish2(segs);
if (unlikely(err)) {
while ((segs = nskb)) {
nskb = segs->next;
segs->next = NULL;
kfree_skb(segs);
}
return err;
}
segs = nskb;
} while (segs);
return 0;
}
int xfrm6_output(struct sk_buff *skb)
{
return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev,
......
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