[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/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 @@
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 @@
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 @@
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 @@
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 @@
/* 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 @@
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);
}