[MLSXFRM]: Flow based matching of xfrm policy and state

This implements a seemless mechanism for xfrm policy selection and
state matching based on the flow sid. This also includes the necessary
SELinux enforcement pieces.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 2 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 0021aad5db43..be02bd981d12 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -367,7 +367,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
                          */
                         if (x->km.state == XFRM_STATE_VALID) {
                                 if (!xfrm_selector_match(&x->sel, fl, family) ||
-                                    !xfrm_sec_ctx_match(pol->security, x->security))
+                                    !security_xfrm_state_pol_flow_match(x, pol, fl))
                                         continue;
                                 if (!best ||
                                     best->km.dying > x->km.dying ||
@@ -379,7 +379,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
                         } else if (x->km.state == XFRM_STATE_ERROR ||
                                    x->km.state == XFRM_STATE_EXPIRED) {
                                 if (xfrm_selector_match(&x->sel, fl, family) &&
-                                    xfrm_sec_ctx_match(pol->security, x->security))
+                                    security_xfrm_state_pol_flow_match(x, pol, fl))
                                         error = -ESRCH;
                         }
                 }
@@ -403,6 +403,14 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
                  * to current session. */
                 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
 
+                error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
+                if (error) {
+                        x->km.state = XFRM_STATE_DEAD;
+                        xfrm_state_put(x);
+                        x = NULL;
+                        goto out;
+                }
+
                 if (km_query(x, tmpl, pol) == 0) {
                         x->km.state = XFRM_STATE_ACQ;
                         list_add_tail(&x->bydst, xfrm_state_bydst+h);