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Diffstat (limited to 'net/ipv4/xfrm4_policy.c')
-rw-r--r--net/ipv4/xfrm4_policy.c219
1 files changed, 74 insertions, 145 deletions
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index cc86fb110dd8..3783e3ee56a4 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -8,36 +8,54 @@
*
*/
-#include <linux/compiler.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
#include <linux/inetdevice.h>
+#include <net/dst.h>
#include <net/xfrm.h>
#include <net/ip.h>
static struct dst_ops xfrm4_dst_ops;
static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
-static int xfrm4_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
+static struct dst_entry *xfrm4_dst_lookup(int tos, xfrm_address_t *saddr,
+ xfrm_address_t *daddr)
{
- return __ip_route_output_key((struct rtable**)dst, fl);
-}
-
-static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
-{
- struct rtable *rt;
- struct flowi fl_tunnel = {
+ struct flowi fl = {
.nl_u = {
.ip4_u = {
+ .tos = tos,
.daddr = daddr->a4,
},
},
};
+ struct dst_entry *dst;
+ struct rtable *rt;
+ int err;
- if (!xfrm4_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
- saddr->a4 = rt->rt_src;
- dst_release(&rt->u.dst);
- return 0;
- }
- return -EHOSTUNREACH;
+ if (saddr)
+ fl.fl4_src = saddr->a4;
+
+ err = __ip_route_output_key(&init_net, &rt, &fl);
+ dst = &rt->u.dst;
+ if (err)
+ dst = ERR_PTR(err);
+ return dst;
+}
+
+static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
+{
+ struct dst_entry *dst;
+ struct rtable *rt;
+
+ dst = xfrm4_dst_lookup(0, NULL, daddr);
+ if (IS_ERR(dst))
+ return -EHOSTUNREACH;
+
+ rt = (struct rtable *)dst;
+ saddr->a4 = rt->rt_src;
+ dst_release(dst);
+ return 0;
}
static struct dst_entry *
@@ -61,142 +79,49 @@ __xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
return dst;
}
-/* Allocate chain of dst_entry's, attach known xfrm's, calculate
- * all the metrics... Shortly, bundle a bundle.
- */
+static int xfrm4_get_tos(struct flowi *fl)
+{
+ return fl->fl4_tos;
+}
-static int
-__xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
- struct flowi *fl, struct dst_entry **dst_p)
+static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
+ int nfheader_len)
{
- struct dst_entry *dst, *dst_prev;
- struct rtable *rt0 = (struct rtable*)(*dst_p);
- struct rtable *rt = rt0;
- struct flowi fl_tunnel = {
- .nl_u = {
- .ip4_u = {
- .saddr = fl->fl4_src,
- .daddr = fl->fl4_dst,
- .tos = fl->fl4_tos
- }
- }
- };
- int i;
- int err;
- int header_len = 0;
- int trailer_len = 0;
+ return 0;
+}
- dst = dst_prev = NULL;
- dst_hold(&rt->u.dst);
+static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
+{
+ struct rtable *rt = (struct rtable *)xdst->route;
- for (i = 0; i < nx; i++) {
- struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
- struct xfrm_dst *xdst;
+ xdst->u.rt.fl = rt->fl;
- if (unlikely(dst1 == NULL)) {
- err = -ENOBUFS;
- dst_release(&rt->u.dst);
- goto error;
- }
+ xdst->u.dst.dev = dev;
+ dev_hold(dev);
- if (!dst)
- dst = dst1;
- else {
- dst_prev->child = dst1;
- dst1->flags |= DST_NOHASH;
- dst_clone(dst1);
- }
+ xdst->u.rt.idev = in_dev_get(dev);
+ if (!xdst->u.rt.idev)
+ return -ENODEV;
- xdst = (struct xfrm_dst *)dst1;
- xdst->route = &rt->u.dst;
- xdst->genid = xfrm[i]->genid;
-
- dst1->next = dst_prev;
- dst_prev = dst1;
-
- header_len += xfrm[i]->props.header_len;
- 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;
-#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, encap_family);
- if (err)
- goto error;
- } else
- dst_hold(&rt->u.dst);
- }
+ xdst->u.rt.peer = rt->peer;
+ if (rt->peer)
+ atomic_inc(&rt->peer->refcnt);
- dst_prev->child = &rt->u.dst;
- dst->path = &rt->u.dst;
-
- *dst_p = dst;
- dst = dst_prev;
-
- dst_prev = *dst_p;
- i = 0;
- for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
- struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
- x->u.rt.fl = *fl;
-
- dst_prev->xfrm = xfrm[i++];
- dst_prev->dev = rt->u.dst.dev;
- if (rt->u.dst.dev)
- dev_hold(rt->u.dst.dev);
- dst_prev->obsolete = -1;
- dst_prev->flags |= DST_HOST;
- dst_prev->lastuse = jiffies;
- dst_prev->header_len = header_len;
- dst_prev->nfheader_len = 0;
- dst_prev->trailer_len = trailer_len;
- memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
-
- /* Copy neighbout for reachability confirmation */
- dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
- dst_prev->input = rt->u.dst.input;
- dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
- if (rt0->peer)
- atomic_inc(&rt0->peer->refcnt);
- x->u.rt.peer = rt0->peer;
- /* Sheit... I remember I did this right. Apparently,
- * it was magically lost, so this code needs audit */
- x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
- x->u.rt.rt_type = rt0->rt_type;
- x->u.rt.rt_src = rt0->rt_src;
- x->u.rt.rt_dst = rt0->rt_dst;
- x->u.rt.rt_gateway = rt0->rt_gateway;
- x->u.rt.rt_spec_dst = rt0->rt_spec_dst;
- x->u.rt.idev = rt0->idev;
- in_dev_hold(rt0->idev);
- header_len -= x->u.dst.xfrm->props.header_len;
- trailer_len -= x->u.dst.xfrm->props.trailer_len;
- }
+ /* Sheit... I remember I did this right. Apparently,
+ * it was magically lost, so this code needs audit */
+ xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
+ RTCF_LOCAL);
+ xdst->u.rt.rt_type = rt->rt_type;
+ xdst->u.rt.rt_src = rt->rt_src;
+ xdst->u.rt.rt_dst = rt->rt_dst;
+ xdst->u.rt.rt_gateway = rt->rt_gateway;
+ xdst->u.rt.rt_spec_dst = rt->rt_spec_dst;
- xfrm_init_pmtu(dst);
return 0;
-
-error:
- if (dst)
- dst_free(dst);
- return err;
}
static void
-_decode_session4(struct sk_buff *skb, struct flowi *fl)
+_decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
{
struct iphdr *iph = ip_hdr(skb);
u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
@@ -212,8 +137,8 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl)
if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
__be16 *ports = (__be16 *)xprth;
- fl->fl_ip_sport = ports[0];
- fl->fl_ip_dport = ports[1];
+ fl->fl_ip_sport = ports[!!reverse];
+ fl->fl_ip_dport = ports[!reverse];
}
break;
@@ -255,12 +180,12 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl)
}
}
fl->proto = iph->protocol;
- fl->fl4_dst = iph->daddr;
- fl->fl4_src = iph->saddr;
+ fl->fl4_dst = reverse ? iph->saddr : iph->daddr;
+ fl->fl4_src = reverse ? iph->daddr : iph->saddr;
fl->fl4_tos = iph->tos;
}
-static inline int xfrm4_garbage_collect(void)
+static inline int xfrm4_garbage_collect(struct dst_ops *ops)
{
xfrm4_policy_afinfo.garbage_collect();
return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
@@ -295,7 +220,8 @@ static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
xdst = (struct xfrm_dst *)dst;
if (xdst->u.rt.idev->dev == dev) {
- struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
+ struct in_device *loopback_idev =
+ in_dev_get(dev->nd_net->loopback_dev);
BUG_ON(!loopback_idev);
do {
@@ -318,6 +244,7 @@ static struct dst_ops xfrm4_dst_ops = {
.update_pmtu = xfrm4_update_pmtu,
.destroy = xfrm4_dst_destroy,
.ifdown = xfrm4_dst_ifdown,
+ .local_out = __ip_local_out,
.gc_thresh = 1024,
.entry_size = sizeof(struct xfrm_dst),
};
@@ -328,8 +255,10 @@ static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
.dst_lookup = xfrm4_dst_lookup,
.get_saddr = xfrm4_get_saddr,
.find_bundle = __xfrm4_find_bundle,
- .bundle_create = __xfrm4_bundle_create,
.decode_session = _decode_session4,
+ .get_tos = xfrm4_get_tos,
+ .init_path = xfrm4_init_path,
+ .fill_dst = xfrm4_fill_dst,
};
static void __init xfrm4_policy_init(void)