[IPSEC]: Remove nhoff from xfrm_input

The nhoff field isn't actually necessary in xfrm_input.  For tunnel
mode transforms we now throw away the output IP header so it makes no
sense to fill in the nexthdr field.  For transport mode we can now let
the function transport_finish do the setting and it knows where the
nexthdr field is.

The only other thing that needs the nexthdr field to be set is the
header extraction code.  However, we can simply move the protocol
extraction out of the generic header extraction.

We want to minimise the amount of info we have to carry around between
transforms as this simplifies the resumption process for async crypto.

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

1 files changed, 7 insertions, 6 deletions

diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index e374903dacdf..662d1e86cfbf 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -21,7 +21,6 @@ int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb)
         return xfrm4_extract_header(skb);
 }
 
-#ifdef CONFIG_NETFILTER
 static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb)
 {
         if (skb->dst == NULL) {
@@ -36,12 +35,10 @@ drop:
         kfree_skb(skb);
         return NET_RX_DROP;
 }
-#endif
 
 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
                     int encap_type)
 {
-        XFRM_SPI_SKB_CB(skb)->nhoff = offsetof(struct iphdr, protocol);
         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
         return xfrm_input(skb, nexthdr, spi, encap_type);
 }
@@ -49,16 +46,20 @@ EXPORT_SYMBOL(xfrm4_rcv_encap);
 
 int xfrm4_transport_finish(struct sk_buff *skb, int async)
 {
+        struct iphdr *iph = ip_hdr(skb);
+
+        iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
+
 #ifdef CONFIG_NETFILTER
         __skb_push(skb, skb->data - skb_network_header(skb));
-        ip_hdr(skb)->tot_len = htons(skb->len);
-        ip_send_check(ip_hdr(skb));
+        iph->tot_len = htons(skb->len);
+        ip_send_check(iph);
 
         NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
                 xfrm4_rcv_encap_finish);
         return 0;
 #else
-        return -ip_hdr(skb)->protocol;
+        return -iph->protocol;
 #endif
 }