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-rw-r--r--net/mac80211/mesh_plink.c195
1 files changed, 115 insertions, 80 deletions
diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index 4311d45..ee2a97f 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -844,6 +844,111 @@ static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
return changed;
}
+/*
+ * mesh_plink_get_event - get correct MPM event
+ *
+ * @sdata: interface
+ * @sta: peer, leave NULL if processing a frame from a new suitable peer
+ * @elems: peering management IEs
+ * @ftype: frame type
+ * @llid: peer's peer link ID
+ * @plid: peer's local link ID
+ *
+ * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
+ * an error.
+ */
+static enum plink_event
+mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta,
+ struct ieee802_11_elems *elems,
+ enum ieee80211_self_protected_actioncode ftype,
+ __le16 llid, __le16 plid)
+{
+ enum plink_event event = PLINK_UNDEFINED;
+ u8 ie_len = elems->peering_len;
+ bool matches_local;
+
+ matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
+ mesh_matches_local(sdata, elems));
+
+ /* deny open request from non-matching peer */
+ if (!matches_local && !sta) {
+ event = OPN_RJCT;
+ goto out;
+ }
+
+ if (!sta) {
+ if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
+ mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
+ goto out;
+ }
+ /* ftype == WLAN_SP_MESH_PEERING_OPEN */
+ if (!mesh_plink_free_count(sdata)) {
+ mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
+ goto out;
+ }
+ } else {
+ if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
+ mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
+ goto out;
+ }
+ if (sta->plink_state == NL80211_PLINK_BLOCKED)
+ goto out;
+ }
+
+ /* new matching peer */
+ if (!sta) {
+ event = OPN_ACPT;
+ goto out;
+ }
+
+ switch (ftype) {
+ case WLAN_SP_MESH_PEERING_OPEN:
+ if (!matches_local)
+ event = OPN_RJCT;
+ if (!mesh_plink_free_count(sdata) ||
+ (sta->plid && sta->plid != plid))
+ event = OPN_IGNR;
+ else
+ event = OPN_ACPT;
+ break;
+ case WLAN_SP_MESH_PEERING_CONFIRM:
+ if (!matches_local)
+ event = CNF_RJCT;
+ if (!mesh_plink_free_count(sdata) ||
+ (sta->llid != llid || sta->plid != plid))
+ event = CNF_IGNR;
+ else
+ event = CNF_ACPT;
+ break;
+ case WLAN_SP_MESH_PEERING_CLOSE:
+ if (sta->plink_state == NL80211_PLINK_ESTAB)
+ /* Do not check for llid or plid. This does not
+ * follow the standard but since multiple plinks
+ * per sta are not supported, it is necessary in
+ * order to avoid a livelock when MP A sees an
+ * establish peer link to MP B but MP B does not
+ * see it. This can be caused by a timeout in
+ * B's peer link establishment or B beign
+ * restarted.
+ */
+ event = CLS_ACPT;
+ else if (sta->plid != plid)
+ event = CLS_IGNR;
+ else if (ie_len == 8 && sta->llid != llid)
+ event = CLS_IGNR;
+ else
+ event = CLS_ACPT;
+ break;
+ default:
+ mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
+ break;
+ }
+
+out:
+ return event;
+}
+
static void
mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
@@ -853,9 +958,8 @@ mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta;
enum plink_event event;
enum ieee80211_self_protected_actioncode ftype;
- bool matches_local;
u32 changed = 0;
- u8 ie_len;
+ u8 ie_len = elems->peering_len;
__le16 plid, llid = 0;
if (!elems->peering) {
@@ -872,7 +976,6 @@ mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
}
ftype = mgmt->u.action.u.self_prot.action_code;
- ie_len = elems->peering_len;
if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
(ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
(ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
@@ -901,9 +1004,6 @@ mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
sta = sta_info_get(sdata, mgmt->sa);
- matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
- mesh_matches_local(sdata, elems));
-
if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
!rssi_threshold_check(sdata, sta)) {
mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
@@ -911,81 +1011,8 @@ mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
goto unlock_rcu;
}
- if (!sta) {
- if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
- mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
- goto unlock_rcu;
- }
- /* ftype == WLAN_SP_MESH_PEERING_OPEN */
- if (!mesh_plink_free_count(sdata)) {
- mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
- goto unlock_rcu;
- }
- /* deny open request from non-matching peer */
- if (!matches_local) {
- mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
- mgmt->sa, 0, plid,
- cpu_to_le16(WLAN_REASON_MESH_CONFIG));
- goto unlock_rcu;
- }
- } else {
- if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
- mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
- goto unlock_rcu;
- }
- if (sta->plink_state == NL80211_PLINK_BLOCKED)
- goto unlock_rcu;
- }
-
/* Now we will figure out the appropriate event... */
- event = PLINK_UNDEFINED;
-
- if (!sta)
- event = OPN_ACPT;
- else {
- switch (ftype) {
- case WLAN_SP_MESH_PEERING_OPEN:
- if (!matches_local)
- event = OPN_RJCT;
- else if (!mesh_plink_free_count(sdata) ||
- (sta->plid && sta->plid != plid))
- event = OPN_IGNR;
- else
- event = OPN_ACPT;
- break;
- case WLAN_SP_MESH_PEERING_CONFIRM:
- if (!matches_local)
- event = CNF_RJCT;
- else if (!mesh_plink_free_count(sdata) ||
- (sta->llid != llid || sta->plid != plid))
- event = CNF_IGNR;
- else
- event = CNF_ACPT;
- break;
- case WLAN_SP_MESH_PEERING_CLOSE:
- if (sta->plink_state == NL80211_PLINK_ESTAB)
- /* Do not check for llid or plid. This does not
- * follow the standard but since multiple plinks
- * per sta are not supported, it is necessary in
- * order to avoid a livelock when MP A sees an
- * establish peer link to MP B but MP B does not
- * see it. This can be caused by a timeout in
- * B's peer link establishment or B beign
- * restarted.
- */
- event = CLS_ACPT;
- else if (sta->plid != plid)
- event = CLS_IGNR;
- else if (ie_len == 8 && sta->llid != llid)
- event = CLS_IGNR;
- else
- event = CLS_ACPT;
- break;
- default:
- mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
- goto unlock_rcu;
- }
- }
+ event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
if (event == OPN_ACPT) {
rcu_read_unlock();
@@ -996,6 +1023,14 @@ mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
goto unlock_rcu;
}
sta->plid = plid;
+ } else if (!sta && event == OPN_RJCT) {
+ mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
+ mgmt->sa, 0, plid,
+ cpu_to_le16(WLAN_REASON_MESH_CONFIG));
+ goto unlock_rcu;
+ } else if (!sta || event == PLINK_UNDEFINED) {
+ /* something went wrong */
+ goto unlock_rcu;
}
changed |= mesh_plink_fsm(sdata, sta, event);
generated by cgit v0.10.2 at 2024-11-05 15:50:07 (GMT)