Fix for IPsec leakage with SELinux enabled - V.03

This version takes into account David Miller's comments regarding treatment of security layer errors in the case of socket policies. Specifically, these errors will be treated like how these kind of errors are treated for the main/sub policies, which is to return a full lookup failure.

 include/linux/security.h        |   24 ++-----
 include/net/flow.h              |    2 
 include/net/xfrm.h              |    3 
 net/core/flow.c                 |   42 ++++++++----
 net/ipv4/xfrm4_policy.c         |    2 
 net/ipv6/xfrm6_policy.c         |    2 
 net/key/af_key.c                |    5 -
 net/xfrm/xfrm_policy.c          |  101 ++++++++++++++++++++++--------
 net/xfrm/xfrm_user.c            |    9 --
 security/dummy.c                |    3 
 security/selinux/include/xfrm.h |    3 
 security/selinux/xfrm.c         |   53 ++++++++++++---
 12 files changed, 162 insertions(+), 87 deletions(-)

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