[XFRM]: Add XFRM_MODE_xxx for future use.
[linux-2.6.git] / net / ipv6 / xfrm6_output.c
index 6b98677..26f1886 100644 (file)
@@ -9,71 +9,14 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#include <linux/compiler.h>
 #include <linux/skbuff.h>
 #include <linux/spinlock.h>
 #include <linux/icmpv6.h>
-#include <net/dsfield.h>
-#include <net/inet_ecn.h>
+#include <linux/netfilter_ipv6.h>
 #include <net/ipv6.h>
 #include <net/xfrm.h>
 
-/* Add encapsulation header.
- *
- * In transport mode, the IP header and mutable extension headers 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:
- *     payload_len
- *
- * On exit, skb->h will be set to the start of the encapsulation header to be
- * filled in by x->type->output and skb->nh will be set to the nextheader field
- * of the extension header directly preceding the encapsulation header, or in
- * its absence, that of the top IP header.  The value of skb->data will always
- * point to the top IP header.
- */
-static void xfrm6_encap(struct sk_buff *skb)
-{
-       struct dst_entry *dst = skb->dst;
-       struct xfrm_state *x = dst->xfrm;
-       struct ipv6hdr *iph, *top_iph;
-       int dsfield;
-
-       skb_push(skb, x->props.header_len);
-       iph = skb->nh.ipv6h;
-
-       if (!x->props.mode) {
-               u8 *prevhdr;
-               int hdr_len;
-
-               hdr_len = ip6_find_1stfragopt(skb, &prevhdr);
-               skb->nh.raw = prevhdr - x->props.header_len;
-               skb->h.raw = skb->data + hdr_len;
-               memmove(skb->data, iph, hdr_len);
-               return;
-       }
-
-       skb->nh.raw = skb->data;
-       top_iph = skb->nh.ipv6h;
-       skb->nh.raw = &top_iph->nexthdr;
-       skb->h.ipv6h = top_iph + 1;
-
-       top_iph->version = 6;
-       top_iph->priority = iph->priority;
-       top_iph->flow_lbl[0] = iph->flow_lbl[0];
-       top_iph->flow_lbl[1] = iph->flow_lbl[1];
-       top_iph->flow_lbl[2] = iph->flow_lbl[2];
-       dsfield = ipv6_get_dsfield(top_iph);
-       dsfield = INET_ECN_encapsulate(dsfield, dsfield);
-       if (x->props.flags & XFRM_STATE_NOECN)
-               dsfield &= ~INET_ECN_MASK;
-       ipv6_change_dsfield(top_iph, 0, dsfield);
-       top_iph->nexthdr = IPPROTO_IPV6; 
-       top_iph->hop_limit = dst_metric(dst->child, RTAX_HOPLIMIT);
-       ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
-       ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
-}
-
 static int xfrm6_tunnel_check_size(struct sk_buff *skb)
 {
        int mtu, ret = 0;
@@ -92,47 +35,55 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb)
        return ret;
 }
 
-int xfrm6_output(struct sk_buff *skb)
+static int xfrm6_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_HW) {
-               err = skb_checksum_help(skb, 0);
+       if (skb->ip_summed == CHECKSUM_PARTIAL) {
+               err = skb_checksum_help(skb);
                if (err)
                        goto error_nolock;
        }
 
-       if (x->props.mode) {
+       if (x->props.mode == XFRM_MODE_TUNNEL) {
                err = xfrm6_tunnel_check_size(skb);
                if (err)
                        goto error_nolock;
        }
 
-       spin_lock_bh(&x->lock);
-       err = xfrm_state_check(x, skb);
-       if (err)
-               goto error;
+       do {
+               spin_lock_bh(&x->lock);
+               err = xfrm_state_check(x, skb);
+               if (err)
+                       goto error;
 
-       xfrm6_encap(skb);
+               err = x->mode->output(skb);
+               if (err)
+                       goto error;
 
-       err = x->type->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++;
+               x->curlft.bytes += skb->len;
+               x->curlft.packets++;
 
-       spin_unlock_bh(&x->lock);
+               spin_unlock_bh(&x->lock);
 
-       skb->nh.raw = skb->data;
-       
-       if (!(skb->dst = dst_pop(dst))) {
-               err = -EHOSTUNREACH;
-               goto error_nolock;
-       }
-       err = NET_XMIT_BYPASS;
+               skb->nh.raw = skb->data;
+               
+               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));
+
+       IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
+       err = 0;
 
 out_exit:
        return err;
@@ -142,3 +93,68 @@ error_nolock:
        kfree_skb(skb);
        goto out_exit;
 }
+
+static int xfrm6_output_finish2(struct sk_buff *skb)
+{
+       int err;
+
+       while (likely((err = xfrm6_output_one(skb)) == 0)) {
+               nf_reset(skb);
+       
+               err = nf_hook(PF_INET6, NF_IP6_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_INET6, NF_IP6_POST_ROUTING, &skb, NULL,
+                             skb->dst->dev, xfrm6_output_finish2);
+               if (unlikely(err != 1))
+                       break;
+       }
+
+       return err;
+}
+
+static int xfrm6_output_finish(struct sk_buff *skb)
+{
+       struct sk_buff *segs;
+
+       if (!skb_is_gso(skb))
+               return xfrm6_output_finish2(skb);
+
+       skb->protocol = htons(ETH_P_IPV6);
+       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 = xfrm6_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 xfrm6_output(struct sk_buff *skb)
+{
+       return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev,
+                      xfrm6_output_finish);
+}