secchan: Add comments.

diff --git a/secchan/ofproto.c b/secchan/ofproto.c
index 6f4666662cef09418cbc08eb8e0ce646d0856d86..fa6b11a58f0ea4fc86fc8c1587b243a31e51f348 100644 (file)
--- a/secchan/ofproto.c
+++ b/secchan/ofproto.c
@@ -96,14 +96,14 @@ static void xlate_actions(const union ofp_action *in, size_t n_in,
 struct rule {
     struct cls_rule cr;
 
-    uint16_t idle_timeout;
-    uint16_t hard_timeout;
-    long long int used;
-    long long int created;
+    uint16_t idle_timeout;      /* In seconds from time of last use. */
+    uint16_t hard_timeout;      /* In seconds from time of creation. */
+    long long int used;         /* Last-used time (0 if never used). */
+    long long int created;      /* Creation time. */
     uint64_t packet_count;      /* Packets from *expired* subrules. */
     uint64_t byte_count;        /* Bytes from *expired* subrules. */
-    uint8_t tcp_flags;
-    uint8_t ip_tos;
+    uint8_t tcp_flags;          /* Bitwise-OR of all TCP flags seen. */
+    uint8_t ip_tos;             /* Last-seen IP type-of-service. */
 
     struct rule *super;
     struct list list;