[IPSEC]: IPv4 over IPv6 IPsec tunnel
This is the patch to support IPv4 over IPv6 IPsec.
Signed-off-by: Miika Komu <miika@iki.fi>
Signed-off-by: Diego Beltrami <Diego.Beltrami@hiit.fi>
Signed-off-by: Kazunori Miyazawa <miyazawa@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
index 5e7d8a7..0bc866c 100644
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -25,6 +25,12 @@
IP6_ECN_set_ce(inner_iph);
}
+static inline void ip6ip_ecn_decapsulate(struct sk_buff *skb)
+{
+ if (INET_ECN_is_ce(ipv6_get_dsfield(skb->nh.ipv6h)))
+ IP_ECN_set_ce(skb->h.ipiph);
+}
+
/* Add encapsulation header.
*
* The top IP header will be constructed per RFC 2401. The following fields
@@ -40,6 +46,7 @@
static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
+ struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
struct ipv6hdr *iph, *top_iph;
int dsfield;
@@ -52,16 +59,24 @@
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];
+ if (xdst->route->ops->family == AF_INET6) {
+ 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];
+ top_iph->nexthdr = IPPROTO_IPV6;
+ } else {
+ top_iph->priority = 0;
+ top_iph->flow_lbl[0] = 0;
+ top_iph->flow_lbl[1] = 0;
+ top_iph->flow_lbl[2] = 0;
+ top_iph->nexthdr = IPPROTO_IPIP;
+ }
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);
@@ -72,7 +87,8 @@
{
int err = -EINVAL;
- if (skb->nh.raw[IP6CB(skb)->nhoff] != IPPROTO_IPV6)
+ if (skb->nh.raw[IP6CB(skb)->nhoff] != IPPROTO_IPV6
+ && skb->nh.raw[IP6CB(skb)->nhoff] != IPPROTO_IPIP)
goto out;
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto out;
@@ -81,10 +97,16 @@
(err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
goto out;
- if (x->props.flags & XFRM_STATE_DECAP_DSCP)
- ipv6_copy_dscp(skb->nh.ipv6h, skb->h.ipv6h);
- if (!(x->props.flags & XFRM_STATE_NOECN))
- ipip6_ecn_decapsulate(skb);
+ if (skb->nh.raw[IP6CB(skb)->nhoff] == IPPROTO_IPV6) {
+ if (x->props.flags & XFRM_STATE_DECAP_DSCP)
+ ipv6_copy_dscp(skb->nh.ipv6h, skb->h.ipv6h);
+ if (!(x->props.flags & XFRM_STATE_NOECN))
+ ipip6_ecn_decapsulate(skb);
+ } else {
+ if (!(x->props.flags & XFRM_STATE_NOECN))
+ ip6ip_ecn_decapsulate(skb);
+ skb->protocol = htons(ETH_P_IP);
+ }
skb->mac.raw = memmove(skb->data - skb->mac_len,
skb->mac.raw, skb->mac_len);
skb->nh.raw = skb->data;