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xfrm: Generate blackhole routes only from route lookup functions

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Currently we genarate a blackhole route route whenever we have
matching policies but can not resolve the states. Here we assume
that dst_output() is called to kill the balckholed 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 blackhole routes only from the
route lookup functions, here we can guarantee a call to
dst_output() afterwards.

Fixes: 2774c131b1 ("xfrm: Handle blackhole route creation via afinfo.")
Reported-by: Konstantinos Kolelis <k.kolelis@sirrix.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2014-09-16 10:08:40 +02:00
parent 95cd6f488d
commit f92ee61982
4 changed files with 36 additions and 7 deletions
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15
include/net/dst.h
View File

@ -490,7 +490,16 @@ static inline struct dst_entry *xfrm_lookup(struct net *net,
int flags)
{
return dst_orig;
}
}
static inline struct dst_entry *xfrm_lookup_route(struct net *net,
struct dst_entry *dst_orig,
const struct flowi *fl,
struct sock *sk,
int flags)
{
return dst_orig;
}
static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
{
@ -502,6 +511,10 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
const struct flowi *fl, struct sock *sk,
int flags);
struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
const struct flowi *fl, struct sock *sk,
int flags);
/* skb attached with this dst needs transformation if dst->xfrm is valid */
static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
{

6
net/ipv4/route.c
View File

@ -2265,9 +2265,9 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,
return rt;
if (flp4->flowi4_proto)
rt = (struct rtable *) xfrm_lookup(net, &rt->dst,
flowi4_to_flowi(flp4),
sk, 0);
rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst,
flowi4_to_flowi(flp4),
sk, 0);
return rt;
}

4
net/ipv6/ip6_output.c
View File

@ -1009,7 +1009,7 @@ struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
if (final_dst)
fl6->daddr = *final_dst;
return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
}
EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
@ -1041,7 +1041,7 @@ struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
if (final_dst)
fl6->daddr = *final_dst;
return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
}
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);

18
net/xfrm/xfrm_policy.c
View File

@ -2138,7 +2138,7 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
xfrm_pols_put(pols, drop_pols);
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
return make_blackhole(net, family, dst_orig);
return ERR_PTR(-EREMOTE);
}
err = -EAGAIN;
@ -2195,6 +2195,22 @@ dropdst:
}
EXPORT_SYMBOL(xfrm_lookup);
/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
* Otherwise we may send out blackholed packets.
*/
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);
if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
return make_blackhole(net, dst_orig->ops->family, dst_orig);
return dst;
}
EXPORT_SYMBOL(xfrm_lookup_route);
static inline int
xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
{