[IPSEC]: Move common output code to xfrm_output

Most of the code in xfrm4_output_one and xfrm6_output_one are identical so
this patch moves them into a common xfrm_output function which will live
in net/xfrm.

In fact this would seem to fix a bug as on IPv4 we never reset the network
header after a transform which may upset netfilter later on.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 36 deletions

diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 44ef208a75cb..04805c7d79c3 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -12,7 +12,6 @@
 #include <linux/if_ether.h>
 #include <linux/kernel.h>
 #include <linux/skbuff.h>
-#include <linux/spinlock.h>
 #include <linux/netfilter_ipv4.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
@@ -41,58 +40,27 @@ out:
         return ret;
 }
 
-static int xfrm4_output_one(struct sk_buff *skb)
+static inline int xfrm4_output_one(struct sk_buff *skb)
 {
         struct dst_entry *dst = skb->dst;
         struct xfrm_state *x = dst->xfrm;
         int err;
 
-        if (skb->ip_summed == CHECKSUM_PARTIAL) {
-                err = skb_checksum_help(skb);
-                if (err)
-                        goto error_nolock;
-        }
-
         if (x->props.mode == XFRM_MODE_TUNNEL) {
                 err = xfrm4_tunnel_check_size(skb);
                 if (err)
                         goto error_nolock;
         }
 
-        do {
-                spin_lock_bh(&x->lock);
-                err = xfrm_state_check(x, skb);
-                if (err)
-                        goto error;
-
-                err = x->mode->output(x, skb);
-                if (err)
-                        goto error;
-
-                err = x->type->output(x, skb);
-                if (err)
-                        goto error;
-
-                x->curlft.bytes += skb->len;
-                x->curlft.packets++;
-
-                spin_unlock_bh(&x->lock);
-
-                if (!(skb->dst = dst_pop(dst))) {
-                        err = -EHOSTUNREACH;
-                        goto error_nolock;
-                }
-                dst = skb->dst;
-                x = dst->xfrm;
-        } while (x && (x->props.mode != XFRM_MODE_TUNNEL));
+        err = xfrm_output(skb);
+        if (err)
+                goto error_nolock;
 
         IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
         err = 0;
 
 out_exit:
         return err;
-error:
-        spin_unlock_bh(&x->lock);
 error_nolock:
         kfree_skb(skb);
         goto out_exit;