Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
[linux-2.6.git] / net / ipv4 / xfrm4_output.c
index ac9d91d..571aa96 100644 (file)
@@ -1,17 +1,19 @@
 /*
  * xfrm4_output.c - Common IPsec encapsulation code for IPv4.
  * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
- * 
+ *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  */
 
-#include <linux/compiler.h>
+#include <linux/if_ether.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/skbuff.h>
-#include <linux/spinlock.h>
 #include <linux/netfilter_ipv4.h>
+#include <net/dst.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
 #include <net/icmp.h>
@@ -20,17 +22,14 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb)
 {
        int mtu, ret = 0;
        struct dst_entry *dst;
-       struct iphdr *iph = skb->nh.iph;
 
        if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
                goto out;
 
-       IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
-       
-       if (!(iph->frag_off & htons(IP_DF)) || skb->local_df)
+       if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->local_df)
                goto out;
 
-       dst = skb->dst;
+       dst = skb_dst(skb);
        mtu = dst_mtu(dst);
        if (skb->len > mtu) {
                icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
@@ -40,96 +39,54 @@ out:
        return ret;
 }
 
-static int xfrm4_output_one(struct sk_buff *skb)
+int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
 {
-       struct dst_entry *dst = skb->dst;
-       struct xfrm_state *x = dst->xfrm;
        int err;
-       
-       if (skb->ip_summed == CHECKSUM_HW) {
-               err = skb_checksum_help(skb, 0);
-               if (err)
-                       goto error_nolock;
-       }
 
-       if (x->props.mode) {
-               err = xfrm4_tunnel_check_size(skb);
-               if (err)
-                       goto error_nolock;
-       }
+       err = xfrm4_tunnel_check_size(skb);
+       if (err)
+               return err;
 
-       do {
-               spin_lock_bh(&x->lock);
-               err = xfrm_state_check(x, skb);
-               if (err)
-                       goto error;
-
-               err = x->mode->output(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_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
 
-       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;
+       return xfrm4_extract_header(skb);
 }
 
-static int xfrm4_output_finish(struct sk_buff *skb)
+int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
 {
        int err;
 
+       err = xfrm_inner_extract_output(x, skb);
+       if (err)
+               return err;
+
+       memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+       IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED;
+
+       skb->protocol = htons(ETH_P_IP);
+
+       return x->outer_mode->output2(x, skb);
+}
+EXPORT_SYMBOL(xfrm4_prepare_output);
+
+static int xfrm4_output_finish(struct sk_buff *skb)
+{
 #ifdef CONFIG_NETFILTER
-       if (!skb->dst->xfrm) {
+       if (!skb_dst(skb)->xfrm) {
                IPCB(skb)->flags |= IPSKB_REROUTED;
                return dst_output(skb);
        }
-#endif
-       while (likely((err = xfrm4_output_one(skb)) == 0)) {
-               nf_reset(skb);
-
-               err = nf_hook(PF_INET, NF_IP_LOCAL_OUT, &skb, NULL,
-                             skb->dst->dev, dst_output);
-               if (unlikely(err != 1))
-                       break;
 
-               if (!skb->dst->xfrm)
-                       return dst_output(skb);
-
-               err = nf_hook(PF_INET, NF_IP_POST_ROUTING, &skb, NULL,
-                             skb->dst->dev, xfrm4_output_finish);
-               if (unlikely(err != 1))
-                       break;
-       }
+       IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
+#endif
 
-       return err;
+       skb->protocol = htons(ETH_P_IP);
+       return xfrm_output(skb);
 }
 
 int xfrm4_output(struct sk_buff *skb)
 {
-       return NF_HOOK_COND(PF_INET, NF_IP_POST_ROUTING, skb, NULL, skb->dst->dev,
-                           xfrm4_output_finish,
+       return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb,
+                           NULL, skb_dst(skb)->dev, xfrm4_output_finish,
                            !(IPCB(skb)->flags & IPSKB_REROUTED));
 }