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xfrm: Generate queueing routes only from route lookup functions

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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: a0073fe18e ("xfrm: Add a state resolution packet queue")
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 10:08:49 +02:00
parent f92ee61982
commit b8c203b2d2
2 changed files with 25 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/dst.h
View File

@ -480,6 +480,7 @@ void dst_init(void);
/* Flags for xfrm_lookup flags argument. */
enum {
XFRM_LOOKUP_ICMP = 1 << 0,
XFRM_LOOKUP_QUEUE = 1 << 1,
};
struct flowi;

32
net/xfrm/xfrm_policy.c
View File

@ -39,6 +39,11 @@
#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
#define XFRM_MAX_QUEUE_LEN 100
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;
@ -1877,13 +1882,14 @@ static int xdst_queue_output(struct sock *sk, 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;
@ -1891,9 +1897,12 @@ 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;
@ -1935,7 +1944,7 @@ 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;
@ -1976,7 +1985,8 @@ 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)
@ -2010,7 +2020,7 @@ 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);
@ -2104,13 +2114,18 @@ 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)) {
@ -2202,7 +2217,8 @@ 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);
@ -2476,7 +2492,7 @@ 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;