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authorHerbert Xu <herbert@gondor.apana.org.au>2007-11-13 21:43:11 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:53:48 -0800
commit862b82c6f960cc61274d370aa78ce1112f92a83e (patch)
tree51e252e1525dd7d02a695d428890a4c37fae2442 /net/xfrm/xfrm_output.c
parentef76bc23ef2acf20c8f7f841a542d8ab74c827c6 (diff)
downloadlinux-862b82c6f960cc61274d370aa78ce1112f92a83e.tar.bz2
[IPSEC]: Merge most of the output path
As part of the work on asynchrnous cryptographic operations, we need to be able to resume from the spot where they occur. As such, it helps if we isolate them to one spot. This patch moves most of the remaining family-specific processing into the common output code. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm/xfrm_output.c')
-rw-r--r--net/xfrm/xfrm_output.c70
1 files changed, 67 insertions, 3 deletions
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index b1efdc8850a7..bcb3701c5cf3 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -12,6 +12,7 @@
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/netdevice.h>
+#include <linux/netfilter.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <net/dst.h>
@@ -40,7 +41,7 @@ err:
return err;
}
-int xfrm_output(struct sk_buff *skb)
+static int xfrm_output_one(struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
struct xfrm_state *x = dst->xfrm;
@@ -87,10 +88,73 @@ int xfrm_output(struct sk_buff *skb)
err = 0;
-error_nolock:
+out_exit:
return err;
error:
spin_unlock_bh(&x->lock);
- goto error_nolock;
+error_nolock:
+ kfree_skb(skb);
+ goto out_exit;
+}
+
+static int xfrm_output2(struct sk_buff *skb)
+{
+ int err;
+
+ while (likely((err = xfrm_output_one(skb)) == 0)) {
+ struct xfrm_state *x;
+
+ nf_reset(skb);
+
+ err = skb->dst->ops->local_out(skb);
+ if (unlikely(err != 1))
+ break;
+
+ x = skb->dst->xfrm;
+ if (!x)
+ return dst_output(skb);
+
+ err = nf_hook(x->inner_mode->afinfo->family,
+ x->inner_mode->afinfo->nf_post_routing, skb,
+ NULL, skb->dst->dev, xfrm_output2);
+ if (unlikely(err != 1))
+ break;
+ }
+
+ return err;
+}
+
+int xfrm_output(struct sk_buff *skb)
+{
+ struct sk_buff *segs;
+
+ if (!skb_is_gso(skb))
+ return xfrm_output2(skb);
+
+ 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 = xfrm_output2(segs);
+
+ if (unlikely(err)) {
+ while ((segs = nskb)) {
+ nskb = segs->next;
+ segs->next = NULL;
+ kfree_skb(segs);
+ }
+ return err;
+ }
+
+ segs = nskb;
+ } while (segs);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(xfrm_output);