Revert to Fedora kernel-2.6.17-1.2187_FC5 patched with vs2.0.2.1; there are too many...

[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..ecc4119 100644 (file)
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -14,12 +14,69 @@
 #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->child, 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)
 {
        int mtu, ret = 0;
@@ -72,9 +129,7 @@ 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)