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Date: Fri, 29 Dec 2006 14:48:08 +0900
From: Kazunori MIYAZAWA <kazunori@...azawa.org>
To: Miika Komu <miika@....fi>, Diego Beltrami <Diego.Beltrami@...t.fi>,
Herbert Xu <herbert@...dor.apana.org.au>,
David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, usagi-core@...ux-ipv6.org
Subject: [RFC][PATCH][IPSEC][3/3] IPv4 over IPv6 IPsec tunnel
This is the patch to support IPv4 over IPv6 IPsec.
Signed-off-by: Miika Komu <miika@....fi>
Signed-off-by: Diego Beltrami <Diego.Beltrami@...t.fi>
Signed-off-by: Kazunori Miyazawa <miyazawa@...ux-ipv6.org>
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index fb9f69c..011136a 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -72,13 +72,11 @@ __xfrm4_bundle_create(struct xfrm_policy
struct dst_entry *dst, *dst_prev;
struct rtable *rt0 = (struct rtable*)(*dst_p);
struct rtable *rt = rt0;
- __be32 remote = fl->fl4_dst;
- __be32 local = fl->fl4_src;
struct flowi fl_tunnel = {
.nl_u = {
.ip4_u = {
- .saddr = local,
- .daddr = remote,
+ .saddr = fl->fl4_src,
+ .daddr = fl->fl4_dst,
.tos = fl->fl4_tos
}
}
@@ -94,7 +92,6 @@ __xfrm4_bundle_create(struct xfrm_policy
for (i = 0; i < nx; i++) {
struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
struct xfrm_dst *xdst;
- int tunnel = 0;
if (unlikely(dst1 == NULL)) {
err = -ENOBUFS;
@@ -116,19 +113,28 @@ __xfrm4_bundle_create(struct xfrm_policy
dst1->next = dst_prev;
dst_prev = dst1;
- if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
- remote = xfrm[i]->id.daddr.a4;
- local = xfrm[i]->props.saddr.a4;
- tunnel = 1;
- }
+
header_len += xfrm[i]->props.header_len;
trailer_len += xfrm[i]->props.trailer_len;
- if (tunnel) {
- fl_tunnel.fl4_src = local;
- fl_tunnel.fl4_dst = remote;
+ if (xfrm[i]->props.mode == XFRM_MODE_TUNNEL) {
+ unsigned short encap_family = xfrm[i]->props.family;
+ switch(encap_family) {
+ case AF_INET:
+ fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
+ fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
+ break;
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ case AF_INET6:
+ ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr*)&xfrm[i]->id.daddr.a6);
+ ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr*)&xfrm[i]->props.saddr.a6);
+ break;
+#endif
+ default:
+ BUG_ON(1);
+ }
err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
- &fl_tunnel, AF_INET);
+ &fl_tunnel, encap_family);
if (err)
goto error;
} else
@@ -145,6 +151,7 @@ __xfrm4_bundle_create(struct xfrm_policy
i = 0;
for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
+ struct xfrm_state_afinfo *afinfo;
x->u.rt.fl = *fl;
dst_prev->xfrm = xfrm[i++];
@@ -162,8 +169,17 @@ __xfrm4_bundle_create(struct xfrm_policy
/* Copy neighbout for reachability confirmation */
dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
dst_prev->input = rt->u.dst.input;
- dst_prev->output = xfrm4_output;
- if (rt->peer)
+ /* XXX: When IPv6 module can be unloaded, we should manage reference
+ * to xfrm6_output in afinfo->output. Miyazawa
+ * */
+ afinfo = xfrm_state_get_afinfo(dst_prev->xfrm->props.family);
+ if (!afinfo) {
+ dst = *dst_p;
+ goto error;
+ }
+ dst_prev->output = afinfo->output;
+ xfrm_state_put_afinfo(afinfo);
+ if (dst_prev->xfrm->props.family == AF_INET && rt->peer)
atomic_inc(&rt->peer->refcnt);
x->u.rt.peer = rt->peer;
/* Sheit... I remember I did this right. Apparently,
@@ -274,7 +290,7 @@ static void xfrm4_dst_destroy(struct dst
if (likely(xdst->u.rt.idev))
in_dev_put(xdst->u.rt.idev);
- if (likely(xdst->u.rt.peer))
+ if (dst->xfrm->props.family == AF_INET && likely(xdst->u.rt.peer))
inet_putpeer(xdst->u.rt.peer);
xfrm_dst_destroy(xdst);
}
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
index 5e7d8a7..55cddcb 100644
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -25,6 +25,12 @@ static inline void ipip6_ecn_decapsulate
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 inline void ipip6_ecn_decapsulate
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 @@ static int xfrm6_tunnel_output(struct xf
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 @@ static int xfrm6_tunnel_input(struct xfr
{
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 @@ static int xfrm6_tunnel_input(struct xfr
(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;
-
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