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authorJohannes Berg <johannes.berg@intel.com>2013-02-15 19:25:00 +0100
committerJohannes Berg <johannes.berg@intel.com>2013-03-06 16:35:44 +0100
commit9a886586c82aa02cb49f8c85e961595716884545 (patch)
tree915cc9035a0172d93a421025ba1e8bdf871a1502 /include
parentb56cf720833c4a9d7e6ed96cc9f5c1a1091ff3bc (diff)
wireless: move sequence number arithmetic to ieee80211.h
Move the sequence number arithmetic code from mac80211 to ieee80211.h so others can use it. Also rename the functions from _seq to _sn, they operate on the sequence number, not the sequence_control field. Also move macros to convert the sequence control to/from the sequence number value from various drivers. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ieee80211.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 7e24fe0cfbcd..a0c550fb65a6 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -113,6 +113,34 @@
#define IEEE80211_CTL_EXT_SSW_FBACK 0x9000
#define IEEE80211_CTL_EXT_SSW_ACK 0xa000
+
+#define IEEE80211_SN_MASK ((IEEE80211_SCTL_SEQ) >> 4)
+#define IEEE80211_MAX_SN IEEE80211_SN_MASK
+#define IEEE80211_SN_MODULO (IEEE80211_MAX_SN + 1)
+
+static inline int ieee80211_sn_less(u16 sn1, u16 sn2)
+{
+ return ((sn1 - sn2) & IEEE80211_SN_MASK) > (IEEE80211_SN_MODULO >> 1);
+}
+
+static inline u16 ieee80211_sn_add(u16 sn1, u16 sn2)
+{
+ return (sn1 + sn2) & IEEE80211_SN_MASK;
+}
+
+static inline u16 ieee80211_sn_inc(u16 sn)
+{
+ return ieee80211_sn_add(sn, 1);
+}
+
+static inline u16 ieee80211_sn_sub(u16 sn1, u16 sn2)
+{
+ return (sn1 - sn2) & IEEE80211_SN_MASK;
+}
+
+#define IEEE80211_SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
+#define IEEE80211_SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
+
/* miscellaneous IEEE 802.11 constants */
#define IEEE80211_MAX_FRAG_THRESHOLD 2352
#define IEEE80211_MAX_RTS_THRESHOLD 2353