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mac80211: mesh: separate plid and aid concepts 

According to 802.11-2012 13.3.1, a mesh STA should assign an AID
upon receipt of a mesh peering open frame rather than using the link
id of the peer.  Using the peer link id has two potential issues:
it may not be unique among the peers, and by its nature it is random,
so the TIM may not compress well.

In preparation for allocating it properly, use sta->sta.aid, but keep
the existing behavior of using the plid in the aid we send.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Bob Copeland 2015-07-14 08:31:58 -04:00 committed by Johannes Berg
parent fa87a6566c
commit a69bd8e60b
4 changed files with 23 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
net/mac80211/mesh_plink.c
View File

@ -13,6 +13,7 @@
#include "rate.h"
#include "mesh.h"
#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
#define PLINK_GET_LLID(p) (p + 2)
#define PLINK_GET_PLID(p) (p + 4)
@ -200,6 +201,7 @@ static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
}
static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
enum ieee80211_self_protected_actioncode action,
u8 *da, u16 llid, u16 plid, u16 reason)
{
@ -249,7 +251,7 @@ static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
/* AID */
pos = skb_put(skb, 2);
put_unaligned_le16(plid, pos);
put_unaligned_le16(sta->sta.aid, pos);
}
if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
@ -362,7 +364,7 @@ u32 mesh_plink_deactivate(struct sta_info *sta)
spin_lock_bh(&sta->mesh->plink_lock);
changed = __mesh_plink_deactivate(sta);
sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
sta->sta.addr, sta->mesh->llid, sta->mesh->plid,
sta->mesh->reason);
spin_unlock_bh(&sta->mesh->plink_lock);
@ -619,7 +621,7 @@ static void mesh_plink_timer(unsigned long data)
}
spin_unlock_bh(&sta->mesh->plink_lock);
if (action)
mesh_plink_frame_tx(sdata, action, sta->sta.addr,
mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
sta->mesh->llid, sta->mesh->plid, reason);
}
@ -689,7 +691,7 @@ u32 mesh_plink_open(struct sta_info *sta)
/* set the non-peer mode to active during peering */
changed = ieee80211_mps_local_status_update(sdata);
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
sta->sta.addr, sta->mesh->llid, 0, 0);
return changed;
}
@ -871,13 +873,13 @@ static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
}
spin_unlock_bh(&sta->mesh->plink_lock);
if (action) {
mesh_plink_frame_tx(sdata, action, sta->sta.addr,
mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
sta->mesh->llid, sta->mesh->plid,
sta->mesh->reason);
/* also send confirm in open case */
if (action == WLAN_SP_MESH_PEERING_OPEN) {
mesh_plink_frame_tx(sdata,
mesh_plink_frame_tx(sdata, sta,
WLAN_SP_MESH_PEERING_CONFIRM,
sta->sta.addr, sta->mesh->llid,
sta->mesh->plid, 0);
@ -1067,8 +1069,9 @@ mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
goto unlock_rcu;
}
sta->mesh->plid = plid;
sta->sta.aid = plid;
} else if (!sta && event == OPN_RJCT) {
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
mgmt->sa, 0, plid,
WLAN_REASON_MESH_CONFIG);
goto unlock_rcu;
@ -1077,9 +1080,15 @@ mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
goto unlock_rcu;
}
/* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
if (!sta->mesh->plid && event == CNF_ACPT)
sta->mesh->plid = plid;
if (event == CNF_ACPT) {
/* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
if (!sta->mesh->plid) {
sta->mesh->plid = plid;
sta->sta.aid = sta->mesh->plid;
}
sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
}
changed |= mesh_plink_fsm(sdata, sta, event);

2
net/mac80211/mesh_ps.c
View File

@ -579,7 +579,7 @@ void ieee80211_mps_frame_release(struct sta_info *sta,
if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
sta->mesh->llid);
sta->mesh->aid);
if (has_buffered)
mps_dbg(sta->sdata, "%pM indicates buffered frames\n",

5
net/mac80211/sta_info.c
View File

@ -635,7 +635,7 @@ static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
bool indicate_tim = false;
u8 ignore_for_tim = sta->sta.uapsd_queues;
int ac;
u16 id;
u16 id = sta->sta.aid;
if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
@ -643,12 +643,9 @@ static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
return;
ps = &sta->sdata->bss->ps;
id = sta->sta.aid;
#ifdef CONFIG_MAC80211_MESH
} else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
ps = &sta->sdata->u.mesh.ps;
/* TIM map only for 1 <= PLID <= IEEE80211_MAX_AID */
id = sta->mesh->plid % (IEEE80211_MAX_AID + 1);
#endif
} else {
return;

2
net/mac80211/sta_info.h
View File

@ -277,6 +277,7 @@ struct ieee80211_fast_tx {
* @plink_lock: serialize access to plink fields
* @llid: Local link ID
* @plid: Peer link ID
* @aid: local aid supplied by peer
* @reason: Cancel reason on PLINK_HOLDING state
* @plink_retries: Retries in establishment
* @plink_state: peer link state
@ -301,6 +302,7 @@ struct mesh_sta {
spinlock_t plink_lock;
u16 llid;
u16 plid;
u16 aid;
u16 reason;
u8 plink_retries;