mac80211: split off mesh handling entirely
This patch splits off mesh handling from the STA/IBSS.
Unfortunately it increases mesh code size a bit, but I
think it makes things clearer. The patch also reduces
per-interface run-time memory usage.
Also clean up a few places where ifdef is not required.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 3ccb359..9e47725 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -12,6 +12,9 @@
#include "ieee80211_i.h"
#include "mesh.h"
+#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
+#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
+
#define PP_OFFSET 1 /* Path Selection Protocol */
#define PM_OFFSET 5 /* Path Selection Metric */
#define CC_OFFSET 9 /* Congestion Control Mode */
@@ -35,6 +38,16 @@
kmem_cache_destroy(rm_cache);
}
+static void ieee80211_mesh_housekeeping_timer(unsigned long data)
+{
+ struct ieee80211_sub_if_data *sdata = (void *) data;
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+
+ ifmsh->housekeeping = true;
+ queue_work(local->hw.workqueue, &ifmsh->work);
+}
+
/**
* mesh_matches_local - check if the config of a mesh point matches ours
*
@@ -46,7 +59,7 @@
*/
bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
{
- struct ieee80211_if_sta *sta = &sdata->u.sta;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
/*
* As support for each feature is added, check for matching
@@ -58,11 +71,11 @@
* - MDA enabled
* - Power management control on fc
*/
- if (sta->mesh_id_len == ie->mesh_id_len &&
- memcmp(sta->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
- memcmp(sta->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
- memcmp(sta->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
- memcmp(sta->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0)
+ if (ifmsh->mesh_id_len == ie->mesh_id_len &&
+ memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
+ memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
+ memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
+ memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0)
return true;
return false;
@@ -95,11 +108,11 @@
*/
free_plinks = mesh_plink_availables(sdata);
- if (free_plinks != sdata->u.sta.accepting_plinks)
- ieee80211_sta_timer((unsigned long) sdata);
+ if (free_plinks != sdata->u.mesh.accepting_plinks)
+ ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
}
-void mesh_ids_set_default(struct ieee80211_if_sta *sta)
+void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
{
u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff};
@@ -112,22 +125,22 @@
{
int i;
- sdata->u.sta.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
- if (!sdata->u.sta.rmc)
+ sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
+ if (!sdata->u.mesh.rmc)
return -ENOMEM;
- sdata->u.sta.rmc->idx_mask = RMC_BUCKETS - 1;
+ sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
for (i = 0; i < RMC_BUCKETS; i++)
- INIT_LIST_HEAD(&sdata->u.sta.rmc->bucket[i].list);
+ INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
return 0;
}
void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
{
- struct mesh_rmc *rmc = sdata->u.sta.rmc;
+ struct mesh_rmc *rmc = sdata->u.mesh.rmc;
struct rmc_entry *p, *n;
int i;
- if (!sdata->u.sta.rmc)
+ if (!sdata->u.mesh.rmc)
return;
for (i = 0; i < RMC_BUCKETS; i++)
@@ -137,7 +150,7 @@
}
kfree(rmc);
- sdata->u.sta.rmc = NULL;
+ sdata->u.mesh.rmc = NULL;
}
/**
@@ -155,7 +168,7 @@
int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
struct ieee80211_sub_if_data *sdata)
{
- struct mesh_rmc *rmc = sdata->u.sta.rmc;
+ struct mesh_rmc *rmc = sdata->u.mesh.rmc;
u32 seqnum = 0;
int entries = 0;
u8 idx;
@@ -217,11 +230,11 @@
}
}
- pos = skb_put(skb, 2 + sdata->u.sta.mesh_id_len);
+ pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
*pos++ = WLAN_EID_MESH_ID;
- *pos++ = sdata->u.sta.mesh_id_len;
- if (sdata->u.sta.mesh_id_len)
- memcpy(pos, sdata->u.sta.mesh_id, sdata->u.sta.mesh_id_len);
+ *pos++ = sdata->u.mesh.mesh_id_len;
+ if (sdata->u.mesh.mesh_id_len)
+ memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
pos = skb_put(skb, 21);
*pos++ = WLAN_EID_MESH_CONFIG;
@@ -230,15 +243,15 @@
*pos++ = 1;
/* Active path selection protocol ID */
- memcpy(pos, sdata->u.sta.mesh_pp_id, 4);
+ memcpy(pos, sdata->u.mesh.mesh_pp_id, 4);
pos += 4;
/* Active path selection metric ID */
- memcpy(pos, sdata->u.sta.mesh_pm_id, 4);
+ memcpy(pos, sdata->u.mesh.mesh_pm_id, 4);
pos += 4;
/* Congestion control mode identifier */
- memcpy(pos, sdata->u.sta.mesh_cc_id, 4);
+ memcpy(pos, sdata->u.mesh.mesh_cc_id, 4);
pos += 4;
/* Channel precedence:
@@ -248,8 +261,8 @@
pos += 4;
/* Mesh capability */
- sdata->u.sta.accepting_plinks = mesh_plink_availables(sdata);
- *pos++ = sdata->u.sta.accepting_plinks ? ACCEPT_PLINKS : 0x00;
+ sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
+ *pos++ = sdata->u.mesh.accepting_plinks ? ACCEPT_PLINKS : 0x00;
*pos++ = 0x00;
return;
@@ -337,10 +350,10 @@
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
- struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct ieee80211_local *local = wdev_priv(&sdata->wdev);
- queue_work(local->hw.workqueue, &ifsta->work);
+ queue_work(local->hw.workqueue, &ifmsh->work);
}
struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
@@ -392,50 +405,255 @@
struct ieee80211_sub_if_data *sdata)
{
meshhdr->flags = 0;
- meshhdr->ttl = sdata->u.sta.mshcfg.dot11MeshTTL;
- put_unaligned(cpu_to_le32(sdata->u.sta.mesh_seqnum), &meshhdr->seqnum);
- sdata->u.sta.mesh_seqnum++;
+ meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
+ put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
+ sdata->u.mesh.mesh_seqnum++;
return 6;
}
+static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_if_mesh *ifmsh)
+{
+ bool free_plinks;
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ printk(KERN_DEBUG "%s: running mesh housekeeping\n",
+ sdata->dev->name);
+#endif
+
+ ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
+ mesh_path_expire(sdata);
+
+ free_plinks = mesh_plink_availables(sdata);
+ if (free_plinks != sdata->u.mesh.accepting_plinks)
+ ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
+
+ ifmsh->housekeeping = false;
+ mod_timer(&ifmsh->housekeeping_timer,
+ round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
+}
+
+
+void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_local *local = sdata->local;
+
+ ifmsh->housekeeping = true;
+ queue_work(local->hw.workqueue, &ifmsh->work);
+ ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
+}
+
+void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
+{
+ del_timer_sync(&sdata->u.mesh.housekeeping_timer);
+ /*
+ * When we get here, the interface is marked down.
+ * Call synchronize_rcu() to wait for the RX path
+ * should it be using the interface and enqueuing
+ * frames at this very time on another CPU.
+ */
+ synchronize_rcu();
+ skb_queue_purge(&sdata->u.mesh.skb_queue);
+}
+
+static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
+ u16 stype,
+ struct ieee80211_mgmt *mgmt,
+ size_t len,
+ struct ieee80211_rx_status *rx_status)
+{
+ struct ieee80211_local *local= sdata->local;
+ struct ieee802_11_elems elems;
+ struct ieee80211_channel *channel;
+ u64 supp_rates = 0;
+ size_t baselen;
+ int freq;
+ enum ieee80211_band band = rx_status->band;
+
+ /* ignore ProbeResp to foreign address */
+ if (stype == IEEE80211_STYPE_PROBE_RESP &&
+ compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
+ return;
+
+ baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
+ if (baselen > len)
+ return;
+
+ ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
+ &elems);
+
+ if (elems.ds_params && elems.ds_params_len == 1)
+ freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
+ else
+ freq = rx_status->freq;
+
+ channel = ieee80211_get_channel(local->hw.wiphy, freq);
+
+ if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
+ return;
+
+ if (elems.mesh_id && elems.mesh_config &&
+ mesh_matches_local(&elems, sdata)) {
+ supp_rates = ieee80211_sta_get_rates(local, &elems, band);
+
+ mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
+ mesh_peer_accepts_plinks(&elems));
+ }
+}
+
+static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len,
+ struct ieee80211_rx_status *rx_status)
+{
+ switch (mgmt->u.action.category) {
+ case PLINK_CATEGORY:
+ mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
+ break;
+ case MESH_PATH_SEL_CATEGORY:
+ mesh_rx_path_sel_frame(sdata, mgmt, len);
+ break;
+ }
+}
+
+static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_rx_status *rx_status;
+ struct ieee80211_if_mesh *ifmsh;
+ struct ieee80211_mgmt *mgmt;
+ u16 stype;
+
+ ifmsh = &sdata->u.mesh;
+
+ rx_status = (struct ieee80211_rx_status *) skb->cb;
+ mgmt = (struct ieee80211_mgmt *) skb->data;
+ stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
+
+ switch (stype) {
+ case IEEE80211_STYPE_PROBE_RESP:
+ case IEEE80211_STYPE_BEACON:
+ ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
+ rx_status);
+ break;
+ case IEEE80211_STYPE_ACTION:
+ ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
+ break;
+ }
+
+ kfree_skb(skb);
+}
+
+static void ieee80211_mesh_work(struct work_struct *work)
+{
+ struct ieee80211_sub_if_data *sdata =
+ container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct sk_buff *skb;
+
+ if (!netif_running(sdata->dev))
+ return;
+
+ if (local->sta_sw_scanning || local->sta_hw_scanning)
+ return;
+
+ while ((skb = skb_dequeue(&ifmsh->skb_queue)))
+ ieee80211_mesh_rx_queued_mgmt(sdata, skb);
+
+ if (ifmsh->preq_queue_len &&
+ time_after(jiffies,
+ ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
+ mesh_path_start_discovery(sdata);
+
+ if (ifmsh->housekeeping)
+ ieee80211_mesh_housekeeping(sdata, ifmsh);
+}
+
+void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list)
+ if (ieee80211_vif_is_mesh(&sdata->vif))
+ queue_work(local->hw.workqueue, &sdata->u.mesh.work);
+ rcu_read_unlock();
+}
+
void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
{
- struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
- ifsta->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
- ifsta->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
- ifsta->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
- ifsta->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
- ifsta->mshcfg.dot11MeshTTL = MESH_TTL;
- ifsta->mshcfg.auto_open_plinks = true;
- ifsta->mshcfg.dot11MeshMaxPeerLinks =
+ INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
+ setup_timer(&ifmsh->housekeeping_timer,
+ ieee80211_mesh_housekeeping_timer,
+ (unsigned long) sdata);
+ skb_queue_head_init(&sdata->u.mesh.skb_queue);
+
+ ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
+ ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
+ ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
+ ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
+ ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
+ ifmsh->mshcfg.auto_open_plinks = true;
+ ifmsh->mshcfg.dot11MeshMaxPeerLinks =
MESH_MAX_ESTAB_PLINKS;
- ifsta->mshcfg.dot11MeshHWMPactivePathTimeout =
+ ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
MESH_PATH_TIMEOUT;
- ifsta->mshcfg.dot11MeshHWMPpreqMinInterval =
+ ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
MESH_PREQ_MIN_INT;
- ifsta->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
+ ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
MESH_DIAM_TRAVERSAL_TIME;
- ifsta->mshcfg.dot11MeshHWMPmaxPREQretries =
+ ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
MESH_MAX_PREQ_RETRIES;
- ifsta->mshcfg.path_refresh_time =
+ ifmsh->mshcfg.path_refresh_time =
MESH_PATH_REFRESH_TIME;
- ifsta->mshcfg.min_discovery_timeout =
+ ifmsh->mshcfg.min_discovery_timeout =
MESH_MIN_DISCOVERY_TIMEOUT;
- ifsta->accepting_plinks = true;
- ifsta->preq_id = 0;
- ifsta->dsn = 0;
- atomic_set(&ifsta->mpaths, 0);
+ ifmsh->accepting_plinks = true;
+ ifmsh->preq_id = 0;
+ ifmsh->dsn = 0;
+ atomic_set(&ifmsh->mpaths, 0);
mesh_rmc_init(sdata);
- ifsta->last_preq = jiffies;
+ ifmsh->last_preq = jiffies;
/* Allocate all mesh structures when creating the first mesh interface. */
if (!mesh_allocated)
ieee80211s_init();
- mesh_ids_set_default(ifsta);
- setup_timer(&ifsta->mesh_path_timer,
+ mesh_ids_set_default(ifmsh);
+ setup_timer(&ifmsh->mesh_path_timer,
ieee80211_mesh_path_timer,
(unsigned long) sdata);
- INIT_LIST_HEAD(&ifsta->preq_queue.list);
- spin_lock_init(&ifsta->mesh_preq_queue_lock);
+ INIT_LIST_HEAD(&ifmsh->preq_queue.list);
+ spin_lock_init(&ifmsh->mesh_preq_queue_lock);
+}
+
+ieee80211_rx_result
+ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
+ struct ieee80211_rx_status *rx_status)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_mgmt *mgmt;
+ u16 fc;
+
+ if (skb->len < 24)
+ return RX_DROP_MONITOR;
+
+ mgmt = (struct ieee80211_mgmt *) skb->data;
+ fc = le16_to_cpu(mgmt->frame_control);
+
+ switch (fc & IEEE80211_FCTL_STYPE) {
+ case IEEE80211_STYPE_PROBE_RESP:
+ case IEEE80211_STYPE_BEACON:
+ case IEEE80211_STYPE_ACTION:
+ memcpy(skb->cb, rx_status, sizeof(*rx_status));
+ skb_queue_tail(&ifmsh->skb_queue, skb);
+ queue_work(local->hw.workqueue, &ifmsh->work);
+ return RX_QUEUED;
+ }
+
+ return RX_CONTINUE;
}