mac80211: use 4-byte mesh sequence number

This follows the new 802.11s/D2.0 draft.

Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 8 insertions, 15 deletions

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 529f301d9372..0b5e03eae6d2 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -113,7 +113,7 @@ struct ieee80211_hdr {
 struct ieee80211s_hdr {
         u8 flags;
         u8 ttl;
-        u8 seqnum[3];
+        __le32 seqnum;
         u8 eaddr1[6];
         u8 eaddr2[6];
         u8 eaddr3[6];
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 8e53ce7ed444..c7314bf4bec2 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -354,7 +354,7 @@ struct ieee80211_if_sta {
         int preq_queue_len;
         struct mesh_stats mshstats;
         struct mesh_config mshcfg;
-        u8 mesh_seqnum[3];
+        u32 mesh_seqnum;
         bool accepting_plinks;
 #endif
         u16 aid;
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 594a3356a508..f76bc26ae4d2 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -8,6 +8,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <asm/unaligned.h>
 #include "ieee80211_i.h"
 #include "mesh.h"
 
@@ -167,8 +168,8 @@ int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
         struct rmc_entry *p, *n;
 
         /* Don't care about endianness since only match matters */
-        memcpy(&seqnum, mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
-        idx = mesh_hdr->seqnum[0] & rmc->idx_mask;
+        memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
+        idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
                 ++entries;
                 if (time_after(jiffies, p->exp_time) ||
@@ -393,16 +394,8 @@ int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 {
         meshhdr->flags = 0;
         meshhdr->ttl = sdata->u.sta.mshcfg.dot11MeshTTL;
-
-        meshhdr->seqnum[0] = sdata->u.sta.mesh_seqnum[0]++;
-        meshhdr->seqnum[1] = sdata->u.sta.mesh_seqnum[1];
-        meshhdr->seqnum[2] = sdata->u.sta.mesh_seqnum[2];
-
-        if (sdata->u.sta.mesh_seqnum[0] == 0) {
-                sdata->u.sta.mesh_seqnum[1]++;
-                if (sdata->u.sta.mesh_seqnum[1] == 0)
-                        sdata->u.sta.mesh_seqnum[2]++;
-        }
+        put_unaligned(cpu_to_le32(sdata->u.sta.mesh_seqnum), &meshhdr->seqnum);
+        sdata->u.sta.mesh_seqnum++;
 
         return 5;
 }
diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
index 742003d3a841..9f8cb7690498 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -139,7 +139,7 @@ struct rmc_entry {
 
 struct mesh_rmc {
         struct rmc_entry bucket[RMC_BUCKETS];
-        u8 idx_mask;
+        u32 idx_mask;
 };