[XFRM]: RFC4303 compliant auditing

This patch adds a number of new IPsec audit events to meet the auditing
requirements of RFC4303.  This includes audit hooks for the following events:

 * Could not find a valid SA [sections 2.1, 3.4.2]
   . xfrm_audit_state_notfound()
   . xfrm_audit_state_notfound_simple()

 * Sequence number overflow [section 3.3.3]
   . xfrm_audit_state_replay_overflow()

 * Replayed packet [section 3.4.3]
   . xfrm_audit_state_replay()

 * Integrity check failure [sections 3.4.4.1, 3.4.4.2]
   . xfrm_audit_state_icvfail()

While RFC4304 deals only with ESP most of the changes in this patch apply to
IPsec in general, i.e. both AH and ESP.  The one case, integrity check
failure, where ESP specific code had to be modified the same was done to the
AH code for the sake of consistency.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 8 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index abc3e39b115b..280f8ded975c 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2407,12 +2407,11 @@ void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 {
         struct audit_buffer *audit_buf;
 
-        if (audit_enabled == 0)
-                return;
-        audit_buf = xfrm_audit_start(auid, secid);
+        audit_buf = xfrm_audit_start("SPD-add");
         if (audit_buf == NULL)
                 return;
-        audit_log_format(audit_buf, " op=SPD-add res=%u", result);
+        xfrm_audit_helper_usrinfo(auid, secid, audit_buf);
+        audit_log_format(audit_buf, " res=%u", result);
         xfrm_audit_common_policyinfo(xp, audit_buf);
         audit_log_end(audit_buf);
 }
@@ -2423,12 +2422,11 @@ void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 {
         struct audit_buffer *audit_buf;
 
-        if (audit_enabled == 0)
-                return;
-        audit_buf = xfrm_audit_start(auid, secid);
+        audit_buf = xfrm_audit_start("SPD-delete");
         if (audit_buf == NULL)
                 return;
-        audit_log_format(audit_buf, " op=SPD-delete res=%u", result);
+        xfrm_audit_helper_usrinfo(auid, secid, audit_buf);
+        audit_log_format(audit_buf, " res=%u", result);
         xfrm_audit_common_policyinfo(xp, audit_buf);
         audit_log_end(audit_buf);
 }