secid reconciliation-v04

This patchset helps with leveraging secmark in defining fine-grained security check points with support for a. a default place holder domain defined using secmark for each of the check points and b. flow control and reconciliation of domains entering/leaving the system.

The reconciliation steps for SELinux are explained in the Labeled Networking document at:
http://marc.theaimsgroup.com/?l=linux-netdev&m=115136637800361&w=2

Also please refer to the discussion at:
http://marc.theaimsgroup.com/?l=selinux&m=115885031311565&w=2

The following are the identifiers handled here:

1. secmark on the skb
2. xfrm security identifier associated with the skb if it used any xfrms, a zero secid otherwise.

The following features are included:

- Retain secmark (from the originating socket/flow) on loopback traffic; this traffic is now flow controlled on the outbound only.

- When multiple iptables labeling rules are present (e.g.: both on PREROUTING and INPUT)
INBOUND: The label in the last rule will prevail.
OUTBOUND: secmark (from the originating socket) is flow-controlled against
the label on the first rule, and, if it passes, the label on the first rule overrides the secmark (from the originating socket). This secmark is flow controlled against labels on the subsequent rules, each time, overridden by those labels.

- Forwarded packets: The FORWARD chain is treated as an outbound chain for flow control purposes. e.g: label with PREROUTING and flow-control with FORWARD or POSTROUTING.

- SELinux postroute_last hook: unfortunately, the secmark Vs. UNLABELED SID check will be done for ALL traffic (couldn't figure out a way to except traffic already processed by (CONN)SECMARK outbound rules).

This patch: Add new flask definitions to SELinux

Adds a new avperm "flow_in" to arbitrate among the identifiers on the inbound (input/forward). Also adds a new avperm "flow_out" to enable flow control checks on the outbound (output/forward), addressed in this patch as well.

---
 security/selinux/include/av_perm_to_string.h |    2 ++
 security/selinux/include/av_permissions.h    |    2 ++
 2 files changed, 4 insertions(+)

index 09fc8a2..1e65d28 100644
@@ -245,6 +245,8 @@
    S_(SECCLASS_PACKET, PACKET__SEND, "send")
    S_(SECCLASS_PACKET, PACKET__RECV, "recv")
    S_(SECCLASS_PACKET, PACKET__RELABELTO, "relabelto")
+   S_(SECCLASS_PACKET, PACKET__FLOW_IN, "flow_in")
+   S_(SECCLASS_PACKET, PACKET__FLOW_OUT, "flow_out")
    S_(SECCLASS_KEY, KEY__VIEW, "view")
    S_(SECCLASS_KEY, KEY__READ, "read")
    S_(SECCLASS_KEY, KEY__WRITE, "write")

index 81f4f52..2faf3d8 100644
@@ -962,6 +962,8 @@ #define APPLETALK_SOCKET__NAME_BIND     
 #define PACKET__SEND                              0x00000001UL
 #define PACKET__RECV                              0x00000002UL
 #define PACKET__RELABELTO                         0x00000004UL
+#define PACKET__FLOW_IN                           0x00000008UL
+#define PACKET__FLOW_OUT                          0x00000010UL
 
 #define KEY__VIEW                                 0x00000001UL
 #define KEY__READ                                 0x00000002UL

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