[IPSEC]: Move flow construction into xfrm_dst_lookup
This patch moves the flow construction from the callers of
xfrm_dst_lookup into that function. It also changes xfrm_dst_lookup
so that it takes an xfrm state as its argument instead of explicit
addresses.
This removes any address-specific logic from the callers of
xfrm_dst_lookup which is needed to correctly support inter-family
transforms.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 3b38e49..8e78530 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -11,7 +11,8 @@
*
*/
-#include <linux/compiler.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <net/addrconf.h>
#include <net/dst.h>
@@ -26,35 +27,40 @@
static struct dst_ops xfrm6_dst_ops;
static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
-static int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl)
+static struct dst_entry *xfrm6_dst_lookup(int tos, xfrm_address_t *saddr,
+ xfrm_address_t *daddr)
{
- struct dst_entry *dst = ip6_route_output(NULL, fl);
- int err = dst->error;
- if (!err)
- *xdst = (struct xfrm_dst *) dst;
- else
+ struct flowi fl = {};
+ struct dst_entry *dst;
+ int err;
+
+ memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
+ if (saddr)
+ memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
+
+ dst = ip6_route_output(NULL, &fl);
+
+ err = dst->error;
+ if (dst->error) {
dst_release(dst);
- return err;
+ dst = ERR_PTR(err);
+ }
+
+ return dst;
}
static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
{
- struct rt6_info *rt;
- struct flowi fl_tunnel = {
- .nl_u = {
- .ip6_u = {
- .daddr = *(struct in6_addr *)&daddr->a6,
- },
- },
- };
+ struct dst_entry *dst;
- if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
- ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
- (struct in6_addr *)&saddr->a6);
- dst_release(&rt->u.dst);
- return 0;
- }
- return -EHOSTUNREACH;
+ dst = xfrm6_dst_lookup(0, NULL, daddr);
+ if (IS_ERR(dst))
+ return -EHOSTUNREACH;
+
+ ipv6_get_saddr(dst, (struct in6_addr *)&daddr->a6,
+ (struct in6_addr *)&saddr->a6);
+ dst_release(dst);
+ return 0;
}
static struct dst_entry *
@@ -87,18 +93,6 @@
return dst;
}
-static inline xfrm_address_t *__xfrm6_bundle_addr_remote(struct xfrm_state *x)
-{
- return (x->type->flags & XFRM_TYPE_REMOTE_COADDR) ? x->coaddr :
- &x->id.daddr;
-}
-
-static inline xfrm_address_t *__xfrm6_bundle_addr_local(struct xfrm_state *x)
-{
- return (x->type->flags & XFRM_TYPE_LOCAL_COADDR) ? x->coaddr :
- &x->props.saddr;
-}
-
/* Allocate chain of dst_entry's, attach known xfrm's, calculate
* all the metrics... Shortly, bundle a bundle.
*/
@@ -110,14 +104,6 @@
struct dst_entry *dst, *dst_prev;
struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
struct rt6_info *rt = rt0;
- struct flowi fl_tunnel = {
- .nl_u = {
- .ip6_u = {
- .saddr = fl->fl6_src,
- .daddr = fl->fl6_dst,
- }
- }
- };
int i;
int err;
int header_len = 0;
@@ -160,25 +146,12 @@
trailer_len += xfrm[i]->props.trailer_len;
if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
- 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;
- case AF_INET6:
- ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr *)__xfrm6_bundle_addr_remote(xfrm[i]));
-
- ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr *)__xfrm6_bundle_addr_local(xfrm[i]));
- break;
- default:
- BUG_ON(1);
- }
-
- err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
- &fl_tunnel, encap_family);
- if (err)
+ dst1 = xfrm_dst_lookup(xfrm[i], 0);
+ err = PTR_ERR(dst1);
+ if (IS_ERR(dst1))
goto error;
+
+ rt = (struct rt6_info *)dst1;
} else
dst_hold(&rt->u.dst);
}