[SECNET PATCH 09/12] Introduce transform_apply_seqdupe

[Ian Jackson]

This distinguishes the two cases.  Right now they are still handled
the same everywhere.

No functional change.

Signed-off-by: Ian Jackson <ijackson at chiark.greenend.org.uk>
---
 secnet.h           | 7 +++++--
 transform-common.h | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/secnet.h b/secnet.h
index 21b94c0..e253a14 100644
--- a/secnet.h
+++ b/secnet.h
@@ -548,12 +548,15 @@ typedef enum {
     transform_apply_ok       = 0, /* all is well (everyone may assume==0) */
     transform_apply_err      = 1, /* any other problem */
     transform_apply_seqrange = 2,
-        /* message decrypted but sequence number was out of range */
+        /* message decrypted but sequence number was out of recent range */
+    transform_apply_seqdupe  = 3,
+        /* message decrypted but was dupe of recent packet */
 } transform_apply_return;
 
 static inline bool_t
 transform_apply_return_badseq(transform_apply_return problem) {
-    return problem == transform_apply_seqrange;
+    return problem == transform_apply_seqrange ||
+	   problem == transform_apply_seqdupe;
 }
 
 typedef transform_apply_return transform_apply_fn(void *st,
diff --git a/transform-common.h b/transform-common.h
index 2e78833..74e08ea 100644
--- a/transform-common.h
+++ b/transform-common.h
@@ -53,7 +53,7 @@ typedef uint32_t recvbitmap_type;
 	    recvbitmap_type recvbit=(uint32_t)1 << skew;	\
 	    if (ti->recvbitmap & recvbit) {			\
 		*errmsg="seqnum: duplicate";			\
-		return transform_apply_seqrange;		\
+		return transform_apply_seqdupe;			\
 	    }							\
 	    ti->recvbitmap |= recvbit;				\
 	}							\
-- 
2.11.0