mac80211: consider more elements in parsing CRC

[ Upstream commit a04564c99bb4a92f805a58e56b2d22cc4978f152 ]

We only use the parsing CRC for checking if a beacon changed,
and elements with an ID > 63 cannot be represented in the
filter. Thus, like we did before with WMM and Cisco vendor
elements, just statically add these forgotten items to the
CRC:
 - WLAN_EID_VHT_OPERATION
 - WLAN_EID_OPMODE_NOTIF

I guess that in most cases when VHT/HE operation change, the HT
operation also changed, and so the change was picked up, but we
did notice that pure operating mode notification changes were
ignored.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/20200131111300.891737-22-luca@coelho.fi
[restrict to VHT for the mac80211 branch]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index f101a64..7fa9871 100644 (file)
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -945,16 +945,22 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
                                elem_parse_failed = true;
                        break;
                case WLAN_EID_VHT_OPERATION:
-                       if (elen >= sizeof(struct ieee80211_vht_operation))
+                       if (elen >= sizeof(struct ieee80211_vht_operation)) {
                                elems->vht_operation = (void *)pos;
-                       else
-                               elem_parse_failed = true;
+                               if (calc_crc)
+                                       crc = crc32_be(crc, pos - 2, elen + 2);
+                               break;
+                       }
+                       elem_parse_failed = true;
                        break;
                case WLAN_EID_OPMODE_NOTIF:
-                       if (elen > 0)
+                       if (elen > 0) {
                                elems->opmode_notif = pos;
-                       else
-                               elem_parse_failed = true;
+                               if (calc_crc)
+                                       crc = crc32_be(crc, pos - 2, elen + 2);
+                               break;
+                       }
+                       elem_parse_failed = true;
                        break;
                case WLAN_EID_MESH_ID:
                        elems->mesh_id = pos;