#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "mesh.h"
+#include "driver-ops.h"
static int mesh_allocated;
static struct kmem_cache *rm_cache;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
struct ieee80211_chanctx_conf *chanctx_conf;
+ struct mesh_csa_settings *csa;
enum ieee80211_band band;
u8 *pos;
struct ieee80211_sub_if_data *sdata;
head_len = hdr_len +
2 + /* NULL SSID */
+ /* Channel Switch Announcement */
+ 2 + sizeof(struct ieee80211_channel_sw_ie) +
+ /* Mesh Channel Swith Parameters */
+ 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
2 + 8 + /* supported rates */
2 + 3; /* DS params */
tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
*pos++ = WLAN_EID_SSID;
*pos++ = 0x0;
+ rcu_read_lock();
+ csa = rcu_dereference(ifmsh->csa);
+ if (csa) {
+ __le16 pre_value;
+
+ pos = skb_put(skb, 13);
+ memset(pos, 0, 13);
+ *pos++ = WLAN_EID_CHANNEL_SWITCH;
+ *pos++ = 3;
+ *pos++ = 0x0;
+ *pos++ = ieee80211_frequency_to_channel(
+ csa->settings.chandef.chan->center_freq);
+ sdata->csa_counter_offset_beacon = hdr_len + 6;
+ *pos++ = csa->settings.count;
+ *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
+ *pos++ = 6;
+ if (ifmsh->chsw_init) {
+ *pos++ = ifmsh->mshcfg.dot11MeshTTL;
+ *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
+ } else {
+ *pos++ = ifmsh->chsw_ttl;
+ }
+ *pos++ |= csa->settings.block_tx ?
+ WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
+ put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
+ pos += 2;
+ pre_value = cpu_to_le16(ifmsh->pre_value);
+ memcpy(pos, &pre_value, 2);
+ pos += 2;
+ }
+ rcu_read_unlock();
+
if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
mesh_add_ds_params_ie(sdata, skb))
goto out_free;
ieee80211_configure_filter(local);
}
+static bool
+ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
+ struct ieee802_11_elems *elems, bool beacon)
+{
+ struct cfg80211_csa_settings params;
+ struct ieee80211_csa_ie csa_ie;
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ struct ieee80211_chanctx *chanctx;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
+ int err, num_chanctx;
+ u32 sta_flags;
+
+ if (sdata->vif.csa_active)
+ return true;
+
+ if (!ifmsh->mesh_id)
+ return false;
+
+ sta_flags = IEEE80211_STA_DISABLE_VHT;
+ switch (sdata->vif.bss_conf.chandef.width) {
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ sta_flags |= IEEE80211_STA_DISABLE_HT;
+ case NL80211_CHAN_WIDTH_20:
+ sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
+ break;
+ default:
+ break;
+ }
+
+ memset(¶ms, 0, sizeof(params));
+ memset(&csa_ie, 0, sizeof(csa_ie));
+ err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, band,
+ sta_flags, sdata->vif.addr,
+ &csa_ie);
+ if (err < 0)
+ return false;
+ if (err)
+ return false;
+
+ params.chandef = csa_ie.chandef;
+ params.count = csa_ie.count;
+
+ if (sdata->vif.bss_conf.chandef.chan->band !=
+ params.chandef.chan->band)
+ return false;
+
+ if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
+ IEEE80211_CHAN_DISABLED)) {
+ sdata_info(sdata,
+ "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
+ sdata->vif.addr,
+ params.chandef.chan->center_freq,
+ params.chandef.width,
+ params.chandef.center_freq1,
+ params.chandef.center_freq2);
+ return false;
+ }
+
+ err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
+ ¶ms.chandef);
+ if (err < 0)
+ return false;
+ if (err) {
+ params.radar_required = true;
+ /* TODO: DFS not (yet) supported */
+ return false;
+ }
+
+ rcu_read_lock();
+ chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+ if (!chanctx_conf)
+ goto failed_chswitch;
+
+ /* don't handle for multi-VIF cases */
+ chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
+ if (chanctx->refcount > 1)
+ goto failed_chswitch;
+
+ num_chanctx = 0;
+ list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
+ num_chanctx++;
+
+ if (num_chanctx > 1)
+ goto failed_chswitch;
+
+ rcu_read_unlock();
+
+ mcsa_dbg(sdata,
+ "received channel switch announcement to go to channel %d MHz\n",
+ params.chandef.chan->center_freq);
+
+ params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
+ if (beacon)
+ ifmsh->chsw_ttl = csa_ie.ttl - 1;
+ else
+ ifmsh->chsw_ttl = 0;
+
+ if (ifmsh->chsw_ttl > 0)
+ if (ieee80211_mesh_csa_beacon(sdata, ¶ms, false) < 0)
+ return false;
+
+ sdata->csa_radar_required = params.radar_required;
+
+ if (params.block_tx)
+ ieee80211_stop_queues_by_reason(&sdata->local->hw,
+ IEEE80211_MAX_QUEUE_MAP,
+ IEEE80211_QUEUE_STOP_REASON_CSA);
+
+ sdata->local->csa_chandef = params.chandef;
+ sdata->vif.csa_active = true;
+
+ ieee80211_bss_info_change_notify(sdata, err);
+ drv_channel_switch_beacon(sdata, ¶ms.chandef);
+
+ return true;
+failed_chswitch:
+ rcu_read_unlock();
+ return false;
+}
+
static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
if (ifmsh->sync_ops)
ifmsh->sync_ops->rx_bcn_presp(sdata,
stype, mgmt, &elems, rx_status);
+
+ if (!ifmsh->chsw_init)
+ ieee80211_mesh_process_chnswitch(sdata, &elems, true);
+}
+
+int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct mesh_csa_settings *tmp_csa_settings;
+ int ret = 0;
+
+ /* Reset the TTL value and Initiator flag */
+ ifmsh->chsw_init = false;
+ ifmsh->chsw_ttl = 0;
+
+ /* Remove the CSA and MCSP elements from the beacon */
+ tmp_csa_settings = rcu_dereference(ifmsh->csa);
+ rcu_assign_pointer(ifmsh->csa, NULL);
+ kfree_rcu(tmp_csa_settings, rcu_head);
+ ret = ieee80211_mesh_rebuild_beacon(sdata);
+ if (ret)
+ return -EINVAL;
+
+ ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
+
+ mcsa_dbg(sdata, "complete switching to center freq %d MHz",
+ sdata->vif.bss_conf.chandef.chan->center_freq);
+ return 0;
+}
+
+int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
+ struct cfg80211_csa_settings *csa_settings,
+ bool csa_action)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct mesh_csa_settings *tmp_csa_settings;
+ int ret = 0;
+
+ tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
+ GFP_ATOMIC);
+ if (!tmp_csa_settings)
+ return -ENOMEM;
+
+ memcpy(&tmp_csa_settings->settings, csa_settings,
+ sizeof(struct cfg80211_csa_settings));
+
+ rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
+
+ ret = ieee80211_mesh_rebuild_beacon(sdata);
+ if (ret) {
+ tmp_csa_settings = rcu_dereference(ifmsh->csa);
+ rcu_assign_pointer(ifmsh->csa, NULL);
+ kfree_rcu(tmp_csa_settings, rcu_head);
+ return ret;
+ }
+
+ ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
+
+ if (csa_action)
+ ieee80211_send_action_csa(sdata, csa_settings);
+
+ return 0;
+}
+
+static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt, size_t len)
+{
+ struct ieee80211_mgmt *mgmt_fwd;
+ struct sk_buff *skb;
+ struct ieee80211_local *local = sdata->local;
+ u8 *pos = mgmt->u.action.u.chan_switch.variable;
+ size_t offset_ttl;
+
+ skb = dev_alloc_skb(local->tx_headroom + len);
+ if (!skb)
+ return -ENOMEM;
+ skb_reserve(skb, local->tx_headroom);
+ mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
+
+ /* offset_ttl is based on whether the secondary channel
+ * offset is available or not. Substract 1 from the mesh TTL
+ * and disable the initiator flag before forwarding.
+ */
+ offset_ttl = (len < 42) ? 7 : 10;
+ *(pos + offset_ttl) -= 1;
+ *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
+ sdata->u.mesh.chsw_ttl = *(pos + offset_ttl);
+
+ memcpy(mgmt_fwd, mgmt, len);
+ eth_broadcast_addr(mgmt_fwd->da);
+ memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
+ memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
+
+ ieee80211_tx_skb(sdata, skb);
+ return 0;
+}
+
+static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt, size_t len)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee802_11_elems elems;
+ u16 pre_value;
+ bool fwd_csa = true;
+ size_t baselen;
+ u8 *pos, ttl;
+
+ if (mgmt->u.action.u.measurement.action_code !=
+ WLAN_ACTION_SPCT_CHL_SWITCH)
+ return;
+
+ pos = mgmt->u.action.u.chan_switch.variable;
+ baselen = offsetof(struct ieee80211_mgmt,
+ u.action.u.chan_switch.variable);
+ ieee802_11_parse_elems(pos, len - baselen, false, &elems);
+
+ ttl = elems.mesh_chansw_params_ie->mesh_ttl;
+ if (!--ttl)
+ fwd_csa = false;
+
+ pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
+ if (ifmsh->pre_value >= pre_value)
+ return;
+
+ ifmsh->pre_value = pre_value;
+
+ if (!ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
+ mcsa_dbg(sdata, "Failed to process CSA action frame");
+ return;
+ }
+
+ /* forward or re-broadcast the CSA frame */
+ if (fwd_csa) {
+ if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
+ mcsa_dbg(sdata, "Failed to forward the CSA frame");
+ }
}
static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
if (mesh_action_is_path_sel(mgmt))
mesh_rx_path_sel_frame(sdata, mgmt, len);
break;
+ case WLAN_CATEGORY_SPECTRUM_MGMT:
+ mesh_rx_csa_frame(sdata, mgmt, len);
+ break;
}
}
(unsigned long) sdata);
ifmsh->accepting_plinks = true;
- ifmsh->preq_id = 0;
- ifmsh->sn = 0;
- ifmsh->num_gates = 0;
atomic_set(&ifmsh->mpaths, 0);
mesh_rmc_init(sdata);
ifmsh->last_preq = jiffies;
ifmsh->next_perr = jiffies;
+ ifmsh->chsw_init = false;
/* Allocate all mesh structures when creating the first mesh interface. */
if (!mesh_allocated)
ieee80211s_init();
projects / ~andy / linux / blobdiff