linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / net / ipv4 / xfrm4_output.c

diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index dda359f..32ad229 100644 (file)
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -9,16 +9,69 @@
  */
 
 #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>
+#include <net/inet_ecn.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
 #include <net/icmp.h>
 
-extern int skb_checksum_setup(struct sk_buff *skb);
+/* Add encapsulation header.
+ *
+ * In transport mode, the IP header will be moved forward to make space
+ * for the encapsulation header.
+ *
+ * In tunnel mode, the top IP header will be constructed per RFC 2401.
+ * The following fields in it shall be filled in by x->type->output:
+ *     tot_len
+ *     check
+ *
+ * On exit, skb->h will be set to the start of the payload to be processed
+ * by x->type->output and skb->nh will be set to the top IP header.
+ */
+static void xfrm4_encap(struct sk_buff *skb)
+{
+       struct dst_entry *dst = skb->dst;
+       struct xfrm_state *x = dst->xfrm;
+       struct iphdr *iph, *top_iph;
+       int flags;
+
+       iph = skb->nh.iph;
+       skb->h.ipiph = iph;
+
+       skb->nh.raw = skb_push(skb, x->props.header_len);
+       top_iph = skb->nh.iph;
+
+       if (!x->props.mode) {
+               skb->h.raw += iph->ihl*4;
+               memmove(top_iph, iph, iph->ihl*4);
+               return;
+       }
+
+       top_iph->ihl = 5;
+       top_iph->version = 4;
+
+       /* DS disclosed */
+       top_iph->tos = INET_ECN_encapsulate(iph->tos, iph->tos);
+
+       flags = x->props.flags;
+       if (flags & XFRM_STATE_NOECN)
+               IP_ECN_clear(top_iph);
+
+       top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
+               0 : (iph->frag_off & htons(IP_DF));
+       if (!top_iph->frag_off)
+               __ip_select_ident(top_iph, dst, 0);
+
+       top_iph->ttl = dst_metric(dst->child, RTAX_HOPLIMIT);
+
+       top_iph->saddr = x->props.saddr.a4;
+       top_iph->daddr = x->id.daddr.a4;
+       top_iph->protocol = IPPROTO_IPIP;
+
+       memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
+}
 
 static int xfrm4_tunnel_check_size(struct sk_buff *skb)
 {
@@ -50,10 +103,6 @@ static int xfrm4_output_one(struct sk_buff *skb)
        struct xfrm_state *x = dst->xfrm;
        int err;
        
-       err = skb_checksum_setup(skb);
-       if (err)
-               goto error_nolock;
-
        if (skb->ip_summed == CHECKSUM_HW) {
                err = skb_checksum_help(skb, 0);
                if (err)
@@ -72,9 +121,7 @@ static int xfrm4_output_one(struct sk_buff *skb)
                if (err)
                        goto error;
 
-               err = x->mode->output(skb);
-               if (err)
-                       goto error;
+               xfrm4_encap(skb);
 
                err = x->type->output(x, skb);
                if (err)
@@ -105,10 +152,16 @@ error_nolock:
        goto out_exit;
 }
 
-static int xfrm4_output_finish2(struct sk_buff *skb)
+static int xfrm4_output_finish(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);
 
@@ -121,7 +174,7 @@ static int xfrm4_output_finish2(struct sk_buff *skb)
                        return dst_output(skb);
 
                err = nf_hook(PF_INET, NF_IP_POST_ROUTING, &skb, NULL,
-                             skb->dst->dev, xfrm4_output_finish2);
+                             skb->dst->dev, xfrm4_output_finish);
                if (unlikely(err != 1))
                        break;
        }
@@ -129,48 +182,6 @@ static int xfrm4_output_finish2(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_is_gso(skb))
-               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,