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-rw-r--r--net/mac80211/mesh.c1047
1 files changed, 1047 insertions, 0 deletions
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
new file mode 100644
index 0000000..6952760
--- /dev/null
+++ b/net/mac80211/mesh.c
@@ -0,0 +1,1047 @@
+/*
+ * Copyright (c) 2008, 2009 open80211s Ltd.
+ * Authors: Luis Carlos Cobo <luisca@cozybit.com>
+ * Javier Cardona <javier@cozybit.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+#include "ieee80211_i.h"
+#include "mesh.h"
+
+static int mesh_allocated;
+static struct kmem_cache *rm_cache;
+
+bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
+{
+ return (mgmt->u.action.u.mesh_action.action_code ==
+ WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
+}
+
+void ieee80211s_init(void)
+{
+ mesh_pathtbl_init();
+ mesh_allocated = 1;
+ rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
+ 0, 0, NULL);
+}
+
+void ieee80211s_stop(void)
+{
+ if (!mesh_allocated)
+ return;
+ mesh_pathtbl_unregister();
+ 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;
+
+ set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
+
+ ieee80211_queue_work(&local->hw, &sdata->work);
+}
+
+/**
+ * mesh_matches_local - check if the config of a mesh point matches ours
+ *
+ * @sdata: local mesh subif
+ * @ie: information elements of a management frame from the mesh peer
+ *
+ * This function checks if the mesh configuration of a mesh point matches the
+ * local mesh configuration, i.e. if both nodes belong to the same mesh network.
+ */
+bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
+ struct ieee802_11_elems *ie)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_local *local = sdata->local;
+ u32 basic_rates = 0;
+ struct cfg80211_chan_def sta_chan_def;
+
+ /*
+ * As support for each feature is added, check for matching
+ * - On mesh config capabilities
+ * - Power Save Support En
+ * - Sync support enabled
+ * - Sync support active
+ * - Sync support required from peer
+ * - MDA enabled
+ * - Power management control on fc
+ */
+ if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
+ memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
+ (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
+ (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
+ (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
+ (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
+ (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
+ return false;
+
+ ieee80211_sta_get_rates(local, ie, ieee80211_get_sdata_band(sdata),
+ &basic_rates);
+
+ if (sdata->vif.bss_conf.basic_rates != basic_rates)
+ return false;
+
+ ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
+ ie->ht_operation, &sta_chan_def);
+
+ if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
+ &sta_chan_def))
+ return false;
+
+ return true;
+}
+
+/**
+ * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
+ *
+ * @ie: information elements of a management frame from the mesh peer
+ */
+bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
+{
+ return (ie->mesh_config->meshconf_cap &
+ IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
+}
+
+/**
+ * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
+ *
+ * @sdata: mesh interface in which mesh beacons are going to be updated
+ *
+ * Returns: beacon changed flag if the beacon content changed.
+ */
+u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
+{
+ bool free_plinks;
+ u32 changed = 0;
+
+ /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
+ * the mesh interface might be able to establish plinks with peers that
+ * are already on the table but are not on PLINK_ESTAB state. However,
+ * in general the mesh interface is not accepting peer link requests
+ * from new peers, and that must be reflected in the beacon
+ */
+ free_plinks = mesh_plink_availables(sdata);
+
+ if (free_plinks != sdata->u.mesh.accepting_plinks) {
+ sdata->u.mesh.accepting_plinks = free_plinks;
+ changed = BSS_CHANGED_BEACON;
+ }
+
+ return changed;
+}
+
+/*
+ * mesh_sta_cleanup - clean up any mesh sta state
+ *
+ * @sta: mesh sta to clean up.
+ */
+void mesh_sta_cleanup(struct sta_info *sta)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ u32 changed;
+
+ /*
+ * maybe userspace handles peer allocation and peering, but in either
+ * case the beacon is still generated by the kernel and we might need
+ * an update.
+ */
+ changed = mesh_accept_plinks_update(sdata);
+ if (!sdata->u.mesh.user_mpm) {
+ changed |= mesh_plink_deactivate(sta);
+ del_timer_sync(&sta->plink_timer);
+ }
+
+ if (changed)
+ ieee80211_mbss_info_change_notify(sdata, changed);
+}
+
+int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
+{
+ int i;
+
+ sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
+ if (!sdata->u.mesh.rmc)
+ return -ENOMEM;
+ sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
+ for (i = 0; i < RMC_BUCKETS; i++)
+ INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
+ return 0;
+}
+
+void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
+{
+ struct mesh_rmc *rmc = sdata->u.mesh.rmc;
+ struct rmc_entry *p, *n;
+ int i;
+
+ if (!sdata->u.mesh.rmc)
+ return;
+
+ for (i = 0; i < RMC_BUCKETS; i++) {
+ list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
+ list_del(&p->list);
+ kmem_cache_free(rm_cache, p);
+ }
+ }
+
+ kfree(rmc);
+ sdata->u.mesh.rmc = NULL;
+}
+
+/**
+ * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
+ *
+ * @sdata: interface
+ * @sa: source address
+ * @mesh_hdr: mesh_header
+ *
+ * Returns: 0 if the frame is not in the cache, nonzero otherwise.
+ *
+ * Checks using the source address and the mesh sequence number if we have
+ * received this frame lately. If the frame is not in the cache, it is added to
+ * it.
+ */
+int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
+ const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
+{
+ struct mesh_rmc *rmc = sdata->u.mesh.rmc;
+ u32 seqnum = 0;
+ int entries = 0;
+ u8 idx;
+ struct rmc_entry *p, *n;
+
+ /* Don't care about endianness since only match matters */
+ memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
+ idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
+ list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
+ ++entries;
+ if (time_after(jiffies, p->exp_time) ||
+ entries == RMC_QUEUE_MAX_LEN) {
+ list_del(&p->list);
+ kmem_cache_free(rm_cache, p);
+ --entries;
+ } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
+ return -1;
+ }
+
+ p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
+ if (!p)
+ return 0;
+
+ p->seqnum = seqnum;
+ p->exp_time = jiffies + RMC_TIMEOUT;
+ memcpy(p->sa, sa, ETH_ALEN);
+ list_add(&p->list, &rmc->bucket[idx]);
+ return 0;
+}
+
+int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ u8 *pos, neighbors;
+ u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
+
+ if (skb_tailroom(skb) < 2 + meshconf_len)
+ return -ENOMEM;
+
+ pos = skb_put(skb, 2 + meshconf_len);
+ *pos++ = WLAN_EID_MESH_CONFIG;
+ *pos++ = meshconf_len;
+
+ /* Active path selection protocol ID */
+ *pos++ = ifmsh->mesh_pp_id;
+ /* Active path selection metric ID */
+ *pos++ = ifmsh->mesh_pm_id;
+ /* Congestion control mode identifier */
+ *pos++ = ifmsh->mesh_cc_id;
+ /* Synchronization protocol identifier */
+ *pos++ = ifmsh->mesh_sp_id;
+ /* Authentication Protocol identifier */
+ *pos++ = ifmsh->mesh_auth_id;
+ /* Mesh Formation Info - number of neighbors */
+ neighbors = atomic_read(&ifmsh->estab_plinks);
+ /* Number of neighbor mesh STAs or 15 whichever is smaller */
+ neighbors = (neighbors > 15) ? 15 : neighbors;
+ *pos++ = neighbors << 1;
+ /* Mesh capability */
+ *pos = IEEE80211_MESHCONF_CAPAB_FORWARDING;
+ *pos |= ifmsh->accepting_plinks ?
+ IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
+ /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
+ *pos |= ifmsh->ps_peers_deep_sleep ?
+ IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
+ *pos++ |= ifmsh->adjusting_tbtt ?
+ IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
+ *pos++ = 0x00;
+
+ return 0;
+}
+
+int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ u8 *pos;
+
+ if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
+ return -ENOMEM;
+
+ pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
+ *pos++ = WLAN_EID_MESH_ID;
+ *pos++ = ifmsh->mesh_id_len;
+ if (ifmsh->mesh_id_len)
+ memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
+
+ return 0;
+}
+
+static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ u8 *pos;
+
+ /* see IEEE802.11-2012 13.14.6 */
+ if (ifmsh->ps_peers_light_sleep == 0 &&
+ ifmsh->ps_peers_deep_sleep == 0 &&
+ ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
+ return 0;
+
+ if (skb_tailroom(skb) < 4)
+ return -ENOMEM;
+
+ pos = skb_put(skb, 2 + 2);
+ *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
+ *pos++ = 2;
+ put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
+
+ return 0;
+}
+
+int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ u8 offset, len;
+ const u8 *data;
+
+ if (!ifmsh->ie || !ifmsh->ie_len)
+ return 0;
+
+ /* fast-forward to vendor IEs */
+ offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
+
+ if (offset) {
+ len = ifmsh->ie_len - offset;
+ data = ifmsh->ie + offset;
+ if (skb_tailroom(skb) < len)
+ return -ENOMEM;
+ memcpy(skb_put(skb, len), data, len);
+ }
+
+ return 0;
+}
+
+int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ u8 len = 0;
+ const u8 *data;
+
+ if (!ifmsh->ie || !ifmsh->ie_len)
+ return 0;
+
+ /* find RSN IE */
+ data = ifmsh->ie;
+ while (data < ifmsh->ie + ifmsh->ie_len) {
+ if (*data == WLAN_EID_RSN) {
+ len = data[1] + 2;
+ break;
+ }
+ data++;
+ }
+
+ if (len) {
+ if (skb_tailroom(skb) < len)
+ return -ENOMEM;
+ memcpy(skb_put(skb, len), data, len);
+ }
+
+ return 0;
+}
+
+static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ struct ieee80211_channel *chan;
+ u8 *pos;
+
+ if (skb_tailroom(skb) < 3)
+ return -ENOMEM;
+
+ rcu_read_lock();
+ chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+ if (WARN_ON(!chanctx_conf)) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+ chan = chanctx_conf->def.chan;
+ rcu_read_unlock();
+
+ pos = skb_put(skb, 2 + 1);
+ *pos++ = WLAN_EID_DS_PARAMS;
+ *pos++ = 1;
+ *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
+
+ return 0;
+}
+
+int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_local *local = sdata->local;
+ enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
+ struct ieee80211_supported_band *sband;
+ u8 *pos;
+
+ sband = local->hw.wiphy->bands[band];
+ if (!sband->ht_cap.ht_supported ||
+ sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
+ return 0;
+
+ if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
+ return -ENOMEM;
+
+ pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
+ ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
+
+ return 0;
+}
+
+int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ struct ieee80211_channel *channel;
+ enum nl80211_channel_type channel_type =
+ cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_sta_ht_cap *ht_cap;
+ u8 *pos;
+
+ rcu_read_lock();
+ chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+ if (WARN_ON(!chanctx_conf)) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+ channel = chanctx_conf->def.chan;
+ rcu_read_unlock();
+
+ sband = local->hw.wiphy->bands[channel->band];
+ ht_cap = &sband->ht_cap;
+
+ if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
+ return 0;
+
+ if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
+ return -ENOMEM;
+
+ pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
+ ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
+ sdata->vif.bss_conf.ht_operation_mode);
+
+ return 0;
+}
+
+static void ieee80211_mesh_path_timer(unsigned long data)
+{
+ struct ieee80211_sub_if_data *sdata =
+ (struct ieee80211_sub_if_data *) data;
+
+ ieee80211_queue_work(&sdata->local->hw, &sdata->work);
+}
+
+static void ieee80211_mesh_path_root_timer(unsigned long data)
+{
+ struct ieee80211_sub_if_data *sdata =
+ (struct ieee80211_sub_if_data *) data;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+
+ set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
+
+ ieee80211_queue_work(&sdata->local->hw, &sdata->work);
+}
+
+void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
+{
+ if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
+ set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
+ else {
+ clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
+ /* stop running timer */
+ del_timer_sync(&ifmsh->mesh_path_root_timer);
+ }
+}
+
+/**
+ * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
+ * @hdr: 802.11 frame header
+ * @fc: frame control field
+ * @meshda: destination address in the mesh
+ * @meshsa: source address address in the mesh. Same as TA, as frame is
+ * locally originated.
+ *
+ * Return the length of the 802.11 (does not include a mesh control header)
+ */
+int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
+ const u8 *meshda, const u8 *meshsa)
+{
+ if (is_multicast_ether_addr(meshda)) {
+ *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
+ /* DA TA SA */
+ memcpy(hdr->addr1, meshda, ETH_ALEN);
+ memcpy(hdr->addr2, meshsa, ETH_ALEN);
+ memcpy(hdr->addr3, meshsa, ETH_ALEN);
+ return 24;
+ } else {
+ *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
+ /* RA TA DA SA */
+ memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
+ memcpy(hdr->addr2, meshsa, ETH_ALEN);
+ memcpy(hdr->addr3, meshda, ETH_ALEN);
+ memcpy(hdr->addr4, meshsa, ETH_ALEN);
+ return 30;
+ }
+}
+
+/**
+ * ieee80211_new_mesh_header - create a new mesh header
+ * @sdata: mesh interface to be used
+ * @meshhdr: uninitialized mesh header
+ * @addr4or5: 1st address in the ae header, which may correspond to address 4
+ * (if addr6 is NULL) or address 5 (if addr6 is present). It may
+ * be NULL.
+ * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
+ * mesh frame
+ *
+ * Return the header length.
+ */
+int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211s_hdr *meshhdr,
+ const char *addr4or5, const char *addr6)
+{
+ if (WARN_ON(!addr4or5 && addr6))
+ return 0;
+
+ memset(meshhdr, 0, sizeof(*meshhdr));
+
+ meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
+
+ /* FIXME: racy -- TX on multiple queues can be concurrent */
+ put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
+ sdata->u.mesh.mesh_seqnum++;
+
+ if (addr4or5 && !addr6) {
+ meshhdr->flags |= MESH_FLAGS_AE_A4;
+ memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
+ return 2 * ETH_ALEN;
+ } else if (addr4or5 && addr6) {
+ meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
+ memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
+ memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
+ return 3 * ETH_ALEN;
+ }
+
+ return ETH_ALEN;
+}
+
+static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ u32 changed;
+
+ ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
+ mesh_path_expire(sdata);
+
+ changed = mesh_accept_plinks_update(sdata);
+ ieee80211_mbss_info_change_notify(sdata, changed);
+
+ mod_timer(&ifmsh->housekeeping_timer,
+ round_jiffies(jiffies +
+ IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
+}
+
+static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ u32 interval;
+
+ mesh_path_tx_root_frame(sdata);
+
+ if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
+ interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
+ else
+ interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
+
+ mod_timer(&ifmsh->mesh_path_root_timer,
+ round_jiffies(TU_TO_EXP_TIME(interval)));
+}
+
+static int
+ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
+{
+ struct beacon_data *bcn;
+ int head_len, tail_len;
+ struct sk_buff *skb;
+ struct ieee80211_mgmt *mgmt;
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ enum ieee80211_band band;
+ u8 *pos;
+ struct ieee80211_sub_if_data *sdata;
+ int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
+ sizeof(mgmt->u.beacon);
+
+ sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
+ rcu_read_lock();
+ chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+ band = chanctx_conf->def.chan->band;
+ rcu_read_unlock();
+
+ head_len = hdr_len +
+ 2 + /* NULL SSID */
+ 2 + 8 + /* supported rates */
+ 2 + 3; /* DS params */
+ tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
+ 2 + sizeof(struct ieee80211_ht_cap) +
+ 2 + sizeof(struct ieee80211_ht_operation) +
+ 2 + ifmsh->mesh_id_len +
+ 2 + sizeof(struct ieee80211_meshconf_ie) +
+ 2 + sizeof(__le16) + /* awake window */
+ ifmsh->ie_len;
+
+ bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
+ /* need an skb for IE builders to operate on */
+ skb = dev_alloc_skb(max(head_len, tail_len));
+
+ if (!bcn || !skb)
+ goto out_free;
+
+ /*
+ * pointers go into the block we allocated,
+ * memory is | beacon_data | head | tail |
+ */
+ bcn->head = ((u8 *) bcn) + sizeof(*bcn);
+
+ /* fill in the head */
+ mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
+ memset(mgmt, 0, hdr_len);
+ mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+ IEEE80211_STYPE_BEACON);
+ eth_broadcast_addr(mgmt->da);
+ memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
+ memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
+ ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
+ mgmt->u.beacon.beacon_int =
+ cpu_to_le16(sdata->vif.bss_conf.beacon_int);
+ mgmt->u.beacon.capab_info |= cpu_to_le16(
+ sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
+
+ pos = skb_put(skb, 2);
+ *pos++ = WLAN_EID_SSID;
+ *pos++ = 0x0;
+
+ if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
+ mesh_add_ds_params_ie(sdata, skb))
+ goto out_free;
+
+ bcn->head_len = skb->len;
+ memcpy(bcn->head, skb->data, bcn->head_len);
+
+ /* now the tail */
+ skb_trim(skb, 0);
+ bcn->tail = bcn->head + bcn->head_len;
+
+ if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
+ mesh_add_rsn_ie(sdata, skb) ||
+ mesh_add_ht_cap_ie(sdata, skb) ||
+ mesh_add_ht_oper_ie(sdata, skb) ||
+ mesh_add_meshid_ie(sdata, skb) ||
+ mesh_add_meshconf_ie(sdata, skb) ||
+ mesh_add_awake_window_ie(sdata, skb) ||
+ mesh_add_vendor_ies(sdata, skb))
+ goto out_free;
+
+ bcn->tail_len = skb->len;
+ memcpy(bcn->tail, skb->data, bcn->tail_len);
+
+ dev_kfree_skb(skb);
+ rcu_assign_pointer(ifmsh->beacon, bcn);
+ return 0;
+out_free:
+ kfree(bcn);
+ dev_kfree_skb(skb);
+ return -ENOMEM;
+}
+
+static int
+ieee80211_mesh_rebuild_beacon(struct ieee80211_if_mesh *ifmsh)
+{
+ struct beacon_data *old_bcn;
+ int ret;
+
+ mutex_lock(&ifmsh->mtx);
+
+ old_bcn = rcu_dereference_protected(ifmsh->beacon,
+ lockdep_is_held(&ifmsh->mtx));
+ ret = ieee80211_mesh_build_beacon(ifmsh);
+ if (ret)
+ /* just reuse old beacon */
+ goto out;
+
+ if (old_bcn)
+ kfree_rcu(old_bcn, rcu_head);
+out:
+ mutex_unlock(&ifmsh->mtx);
+ return ret;
+}
+
+void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
+ u32 changed)
+{
+ if (sdata->vif.bss_conf.enable_beacon &&
+ (changed & (BSS_CHANGED_BEACON |
+ BSS_CHANGED_HT |
+ BSS_CHANGED_BASIC_RATES |
+ BSS_CHANGED_BEACON_INT)))
+ if (ieee80211_mesh_rebuild_beacon(&sdata->u.mesh))
+ return;
+ ieee80211_bss_info_change_notify(sdata, changed);
+}
+
+int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_local *local = sdata->local;
+ u32 changed = BSS_CHANGED_BEACON |
+ BSS_CHANGED_BEACON_ENABLED |
+ BSS_CHANGED_HT |
+ BSS_CHANGED_BASIC_RATES |
+ BSS_CHANGED_BEACON_INT;
+ enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
+
+ local->fif_other_bss++;
+ /* mesh ifaces must set allmulti to forward mcast traffic */
+ atomic_inc(&local->iff_allmultis);
+ ieee80211_configure_filter(local);
+
+ ifmsh->mesh_cc_id = 0; /* Disabled */
+ ifmsh->mesh_auth_id = 0; /* Disabled */
+ /* register sync ops from extensible synchronization framework */
+ ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
+ ifmsh->adjusting_tbtt = false;
+ ifmsh->sync_offset_clockdrift_max = 0;
+ set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
+ ieee80211_mesh_root_setup(ifmsh);
+ ieee80211_queue_work(&local->hw, &sdata->work);
+ sdata->vif.bss_conf.ht_operation_mode =
+ ifmsh->mshcfg.ht_opmode;
+ sdata->vif.bss_conf.enable_beacon = true;
+ sdata->vif.bss_conf.basic_rates =
+ ieee80211_mandatory_rates(local, band);
+
+ changed |= ieee80211_mps_local_status_update(sdata);
+
+ if (ieee80211_mesh_build_beacon(ifmsh)) {
+ ieee80211_stop_mesh(sdata);
+ return -ENOMEM;
+ }
+
+ ieee80211_bss_info_change_notify(sdata, changed);
+
+ netif_carrier_on(sdata->dev);
+ return 0;
+}
+
+void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct beacon_data *bcn;
+
+ netif_carrier_off(sdata->dev);
+
+ /* stop the beacon */
+ ifmsh->mesh_id_len = 0;
+ sdata->vif.bss_conf.enable_beacon = false;
+ clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
+ ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
+ mutex_lock(&ifmsh->mtx);
+ bcn = rcu_dereference_protected(ifmsh->beacon,
+ lockdep_is_held(&ifmsh->mtx));
+ rcu_assign_pointer(ifmsh->beacon, NULL);
+ kfree_rcu(bcn, rcu_head);
+ mutex_unlock(&ifmsh->mtx);
+
+ /* flush STAs and mpaths on this iface */
+ sta_info_flush(sdata);
+ mesh_path_flush_by_iface(sdata);
+
+ /* free all potentially still buffered group-addressed frames */
+ local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
+ skb_queue_purge(&ifmsh->ps.bc_buf);
+
+ del_timer_sync(&sdata->u.mesh.housekeeping_timer);
+ del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
+ del_timer_sync(&sdata->u.mesh.mesh_path_timer);
+ /*
+ * If the timer fired while we waited for it, it will have
+ * requeued the work. Now the work will be running again
+ * but will not rearm the timer again because it checks
+ * whether the interface is running, which, at this point,
+ * it no longer is.
+ */
+ cancel_work_sync(&sdata->work);
+
+ local->fif_other_bss--;
+ atomic_dec(&local->iff_allmultis);
+ ieee80211_configure_filter(local);
+}
+
+static void
+ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt, size_t len)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct sk_buff *presp;
+ struct beacon_data *bcn;
+ struct ieee80211_mgmt *hdr;
+ struct ieee802_11_elems elems;
+ size_t baselen;
+ u8 *pos;
+
+ pos = mgmt->u.probe_req.variable;
+ baselen = (u8 *) pos - (u8 *) mgmt;
+ if (baselen > len)
+ return;
+
+ ieee802_11_parse_elems(pos, len - baselen, false, &elems);
+
+ /* 802.11-2012 10.1.4.3.2 */
+ if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
+ !is_broadcast_ether_addr(mgmt->da)) ||
+ elems.ssid_len != 0)
+ return;
+
+ if (elems.mesh_id_len != 0 &&
+ (elems.mesh_id_len != ifmsh->mesh_id_len ||
+ memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
+ return;
+
+ rcu_read_lock();
+ bcn = rcu_dereference(ifmsh->beacon);
+
+ if (!bcn)
+ goto out;
+
+ presp = dev_alloc_skb(local->tx_headroom +
+ bcn->head_len + bcn->tail_len);
+ if (!presp)
+ goto out;
+
+ skb_reserve(presp, local->tx_headroom);
+ memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
+ memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
+ hdr = (struct ieee80211_mgmt *) presp->data;
+ hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+ IEEE80211_STYPE_PROBE_RESP);
+ memcpy(hdr->da, mgmt->sa, ETH_ALEN);
+ IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
+ ieee80211_tx_skb(sdata, presp);
+out:
+ rcu_read_unlock();
+}
+
+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 ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee802_11_elems elems;
+ struct ieee80211_channel *channel;
+ size_t baselen;
+ int freq;
+ enum ieee80211_band band = rx_status->band;
+
+ /* ignore ProbeResp to foreign address */
+ if (stype == IEEE80211_STYPE_PROBE_RESP &&
+ !ether_addr_equal(mgmt->da, sdata->vif.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,
+ false, &elems);
+
+ /* ignore non-mesh or secure / unsecure mismatch */
+ if ((!elems.mesh_id || !elems.mesh_config) ||
+ (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
+ (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
+ return;
+
+ if (elems.ds_params)
+ freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
+ else
+ freq = rx_status->freq;
+
+ channel = ieee80211_get_channel(local->hw.wiphy, freq);
+
+ if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
+ return;
+
+ if (mesh_matches_local(sdata, &elems))
+ mesh_neighbour_update(sdata, mgmt->sa, &elems);
+
+ if (ifmsh->sync_ops)
+ ifmsh->sync_ops->rx_bcn_presp(sdata,
+ stype, mgmt, &elems, rx_status);
+}
+
+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 WLAN_CATEGORY_SELF_PROTECTED:
+ switch (mgmt->u.action.u.self_prot.action_code) {
+ case WLAN_SP_MESH_PEERING_OPEN:
+ case WLAN_SP_MESH_PEERING_CLOSE:
+ case WLAN_SP_MESH_PEERING_CONFIRM:
+ mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
+ break;
+ }
+ break;
+ case WLAN_CATEGORY_MESH_ACTION:
+ if (mesh_action_is_path_sel(mgmt))
+ mesh_rx_path_sel_frame(sdata, mgmt, len);
+ break;
+ }
+}
+
+void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_rx_status *rx_status;
+ struct ieee80211_mgmt *mgmt;
+ u16 stype;
+
+ rx_status = IEEE80211_SKB_RXCB(skb);
+ 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_PROBE_REQ:
+ ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
+ break;
+ case IEEE80211_STYPE_ACTION:
+ ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
+ break;
+ }
+}
+
+void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+
+ if (ifmsh->preq_queue_len &&
+ time_after(jiffies,
+ ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
+ mesh_path_start_discovery(sdata);
+
+ if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
+ mesh_mpath_table_grow();
+
+ if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
+ mesh_mpp_table_grow();
+
+ if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
+ ieee80211_mesh_housekeeping(sdata);
+
+ if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
+ ieee80211_mesh_rootpath(sdata);
+
+ if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
+ mesh_sync_adjust_tbtt(sdata);
+}
+
+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) &&
+ ieee80211_sdata_running(sdata))
+ ieee80211_queue_work(&local->hw, &sdata->work);
+ rcu_read_unlock();
+}
+
+void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ static u8 zero_addr[ETH_ALEN] = {};
+
+ setup_timer(&ifmsh->housekeeping_timer,
+ ieee80211_mesh_housekeeping_timer,
+ (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;
+ /* Allocate all mesh structures when creating the first mesh interface. */
+ if (!mesh_allocated)
+ ieee80211s_init();
+ setup_timer(&ifmsh->mesh_path_timer,
+ ieee80211_mesh_path_timer,
+ (unsigned long) sdata);
+ setup_timer(&ifmsh->mesh_path_root_timer,
+ ieee80211_mesh_path_root_timer,
+ (unsigned long) sdata);
+ INIT_LIST_HEAD(&ifmsh->preq_queue.list);
+ skb_queue_head_init(&ifmsh->ps.bc_buf);
+ spin_lock_init(&ifmsh->mesh_preq_queue_lock);
+ spin_lock_init(&ifmsh->sync_offset_lock);
+ RCU_INIT_POINTER(ifmsh->beacon, NULL);
+ mutex_init(&ifmsh->mtx);
+
+ sdata->vif.bss_conf.bssid = zero_addr;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-18 05:20:15 +0000