diff options
Diffstat (limited to 'net/xfrm/xfrm_policy.c')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index d0882e53b6fc..b8bab89616a0 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -29,6 +29,8 @@ #include "xfrm_hash.h" +int sysctl_xfrm_larval_drop; + DEFINE_MUTEX(xfrm_cfg_mutex); EXPORT_SYMBOL(xfrm_cfg_mutex); @@ -1390,8 +1392,8 @@ static int stale_bundle(struct dst_entry *dst); * At the moment we eat a raw IP route. Mostly to speed up lookups * on interfaces with disabled IPsec. */ -int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, - struct sock *sk, int flags) +int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, + struct sock *sk, int flags) { struct xfrm_policy *policy; struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; @@ -1509,6 +1511,13 @@ restart: if (unlikely(nx<0)) { err = nx; + if (err == -EAGAIN && sysctl_xfrm_larval_drop) { + /* EREMOTE tells the caller to generate + * a one-shot blackhole route. + */ + xfrm_pol_put(policy); + return -EREMOTE; + } if (err == -EAGAIN && flags) { DECLARE_WAITQUEUE(wait, current); @@ -1598,6 +1607,21 @@ error: *dst_p = NULL; return err; } +EXPORT_SYMBOL(__xfrm_lookup); + +int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, + struct sock *sk, int flags) +{ + int err = __xfrm_lookup(dst_p, fl, sk, flags); + + if (err == -EREMOTE) { + dst_release(*dst_p); + *dst_p = NULL; + err = -EAGAIN; + } + + return err; +} EXPORT_SYMBOL(xfrm_lookup); static inline int |