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authorSteffen Klassert <steffen.klassert@secunet.com>2014-09-16 10:08:49 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-10-15 08:36:42 +0200
commit8f20fcf03cdb5d5ee7e14373409a7a3eae2163fd (patch)
tree8314b99062d6fe4abfda0617f6685c40c6310c4d /net
parent0845e2d0da03b2d739c87219ad212e604bf57431 (diff)
downloadlwn-8f20fcf03cdb5d5ee7e14373409a7a3eae2163fd.tar.gz
lwn-8f20fcf03cdb5d5ee7e14373409a7a3eae2163fd.zip
xfrm: Generate queueing routes only from route lookup functions
[ Upstream commit b8c203b2d2fc961bafd53b41d5396bbcdec55998 ] Currently we genarate a queueing route if we have matching policies but can not resolve the states and the sysctl xfrm_larval_drop is disabled. Here we assume that dst_output() is called to kill the queued packets. Unfortunately this assumption is not true in all cases, so it is possible that these packets leave the system unwanted. We fix this by generating queueing routes only from the route lookup functions, here we can guarantee a call to dst_output() afterwards. Fixes: a0073fe18e71 ("xfrm: Add a state resolution packet queue") Reported-by: Konstantinos Kolelis <k.kolelis@sirrix.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/xfrm/xfrm_policy.c32
1 files changed, 24 insertions, 8 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 9d4fa4c1e1b4..59cf325f2772 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -41,6 +41,11 @@
static struct dst_entry *xfrm_policy_sk_bundles;
+struct xfrm_flo {
+ struct dst_entry *dst_orig;
+ u8 flags;
+};
+
static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
__read_mostly;
@@ -1889,13 +1894,14 @@ static int xdst_queue_output(struct sk_buff *skb)
}
static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
- struct dst_entry *dst,
+ struct xfrm_flo *xflo,
const struct flowi *fl,
int num_xfrms,
u16 family)
{
int err;
struct net_device *dev;
+ struct dst_entry *dst;
struct dst_entry *dst1;
struct xfrm_dst *xdst;
@@ -1903,9 +1909,12 @@ static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
if (IS_ERR(xdst))
return xdst;
- if (net->xfrm.sysctl_larval_drop || num_xfrms <= 0)
+ if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
+ net->xfrm.sysctl_larval_drop ||
+ num_xfrms <= 0)
return xdst;
+ dst = xflo->dst_orig;
dst1 = &xdst->u.dst;
dst_hold(dst);
xdst->route = dst;
@@ -1947,7 +1956,7 @@ static struct flow_cache_object *
xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
struct flow_cache_object *oldflo, void *ctx)
{
- struct dst_entry *dst_orig = (struct dst_entry *)ctx;
+ struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
struct xfrm_dst *xdst, *new_xdst;
int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
@@ -1988,7 +1997,8 @@ xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
goto make_dummy_bundle;
}
- new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
+ new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
+ xflo->dst_orig);
if (IS_ERR(new_xdst)) {
err = PTR_ERR(new_xdst);
if (err != -EAGAIN)
@@ -2022,7 +2032,7 @@ make_dummy_bundle:
/* We found policies, but there's no bundles to instantiate:
* either because the policy blocks, has no transformations or
* we could not build template (no xfrm_states).*/
- xdst = xfrm_create_dummy_bundle(net, dst_orig, fl, num_xfrms, family);
+ xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
if (IS_ERR(xdst)) {
xfrm_pols_put(pols, num_pols);
return ERR_CAST(xdst);
@@ -2121,13 +2131,18 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
}
if (xdst == NULL) {
+ struct xfrm_flo xflo;
+
+ xflo.dst_orig = dst_orig;
+ xflo.flags = flags;
+
/* To accelerate a bit... */
if ((dst_orig->flags & DST_NOXFRM) ||
!net->xfrm.policy_count[XFRM_POLICY_OUT])
goto nopol;
flo = flow_cache_lookup(net, fl, family, dir,
- xfrm_bundle_lookup, dst_orig);
+ xfrm_bundle_lookup, &xflo);
if (flo == NULL)
goto nopol;
if (IS_ERR(flo)) {
@@ -2219,7 +2234,8 @@ struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
const struct flowi *fl,
struct sock *sk, int flags)
{
- struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk, flags);
+ struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
+ flags | XFRM_LOOKUP_QUEUE);
if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
return make_blackhole(net, dst_orig->ops->family, dst_orig);
@@ -2493,7 +2509,7 @@ int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
skb_dst_force(skb);
- dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0);
+ dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
if (IS_ERR(dst)) {
res = 0;
dst = NULL;