/* * Copyright (c) 2008, 2009 open80211s Ltd. * Authors: Luis Carlos Cobo * Javier Cardona * * 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 #include #include "ieee80211_i.h" #include "mesh.h" #include "driver-ops.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_allocated = 1; rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), 0, 0, NULL); } void ieee80211s_stop(void) { if (!mesh_allocated) return; 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; 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(sdata, ie, ieee80211_get_sdata_band(sdata), &basic_rates); if (sdata->vif.bss_conf.basic_rates != basic_rates) return false; cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan, NL80211_CHAN_NO_HT); ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def); ieee80211_chandef_vht_oper(ie->vht_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->mesh->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; if (!rmc) return -1; /* 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; /* save a pointer for quick updates in pre-tbtt */ ifmsh->meshconf_offset = pos - skb->data; /* 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); neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); *pos++ = neighbors << 1; /* Mesh capability */ *pos = 0x00; *pos |= ifmsh->mshcfg.dot11MeshForwarding ? IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; *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 = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); if (!data) return 0; len = data[1] + 2; 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 || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 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; 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 || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 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, false); return 0; } int mesh_add_vht_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->vht_cap.vht_supported || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) return 0; if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap)) return -ENOMEM; pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap)); ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap); return 0; } int mesh_add_vht_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; struct ieee80211_supported_band *sband; struct ieee80211_sta_vht_cap *vht_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]; vht_cap = &sband->vht_cap; if (!vht_cap->vht_supported || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) return 0; if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation)) return -ENOMEM; pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); ieee80211_ie_build_vht_oper(pos, vht_cap, &sdata->vif.bss_conf.chandef); 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 */ eth_zero_addr(hdr->addr1); /* 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. */ unsigned 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; if (ifmsh->mshcfg.plink_timeout > 0) ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 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; struct mesh_csa_settings *csa; 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 */ /* 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) + 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 */ 2 + sizeof(struct ieee80211_vht_cap) + 2 + sizeof(struct ieee80211_vht_operation) + 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; rcu_read_lock(); csa = rcu_dereference(ifmsh->csa); if (csa) { 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); bcn->csa_current_counter = csa->settings.count; bcn->csa_counter_offsets[0] = hdr_len + 6; *pos++ = csa->settings.count; *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; *pos++ = 6; if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_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; put_unaligned_le16(ifmsh->pre_value, pos); pos += 2; } rcu_read_unlock(); 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_vht_cap_ie(sdata, skb) || mesh_add_vht_oper_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); bcn->meshconf = (struct ieee80211_meshconf_ie *) (bcn->tail + ifmsh->meshconf_offset); 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_sub_if_data *sdata) { struct beacon_data *old_bcn; int ret; old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, lockdep_is_held(&sdata->wdev.mtx)); ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); if (ret) /* just reuse old beacon */ return ret; if (old_bcn) kfree_rcu(old_bcn, rcu_head); return 0; } void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, u32 changed) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; unsigned long bits = changed; u32 bit; if (!bits) return; /* if we race with running work, worst case this work becomes a noop */ for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) set_bit(bit, &ifmsh->mbss_changed); set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); ieee80211_queue_work(&sdata->local->hw, &sdata->work); } 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; 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 */ /* 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; changed |= ieee80211_mps_local_status_update(sdata); if (ieee80211_mesh_build_beacon(ifmsh)) { ieee80211_stop_mesh(sdata); return -ENOMEM; } ieee80211_recalc_dtim(local, sdata); 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); bcn = rcu_dereference_protected(ifmsh->beacon, lockdep_is_held(&sdata->wdev.mtx)); RCU_INIT_POINTER(ifmsh->beacon, NULL); kfree_rcu(bcn, rcu_head); /* flush STAs and mpaths on this iface */ sta_info_flush(sdata); mesh_path_flush_by_iface(sdata); mesh_pathtbl_unregister(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); /* clear any mesh work (for next join) we may have accrued */ ifmsh->wrkq_flags = 0; ifmsh->mbss_changed = 0; local->fif_other_bss--; atomic_dec(&local->iff_allmultis); 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_if_mesh *ifmsh = &sdata->u.mesh; enum ieee80211_band band = ieee80211_get_sdata_band(sdata); int err; u32 sta_flags; sdata_assert_lock(sdata); 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, 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 (!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, NL80211_IFTYPE_MESH_POINT); if (err < 0) return false; if (err > 0) /* TODO: DFS not (yet) supported */ return false; params.radar_required = err; if (cfg80211_chandef_identical(¶ms.chandef, &sdata->vif.bss_conf.chandef)) { mcsa_dbg(sdata, "received csa with an identical chandef, ignoring\n"); return true; } 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; if (ifmsh->pre_value >= csa_ie.pre_value) return false; ifmsh->pre_value = csa_ie.pre_value; } if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) return false; ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, ¶ms) < 0) return false; return true; } 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); if (!elems.mesh_id) return; /* 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); if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && !sdata->vif.csa_active) 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; int changed = 0; /* Reset the TTL value and Initiator flag */ ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; ifmsh->chsw_ttl = 0; /* Remove the CSA and MCSP elements from the beacon */ tmp_csa_settings = rcu_dereference(ifmsh->csa); RCU_INIT_POINTER(ifmsh->csa, NULL); if (tmp_csa_settings) kfree_rcu(tmp_csa_settings, rcu_head); ret = ieee80211_mesh_rebuild_beacon(sdata); if (ret) return -EINVAL; changed |= BSS_CHANGED_BEACON; mcsa_dbg(sdata, "complete switching to center freq %d MHz", sdata->vif.bss_conf.chandef.chan->center_freq); return changed; } int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, struct cfg80211_csa_settings *csa_settings) { 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_INIT_POINTER(ifmsh->csa, NULL); kfree_rcu(tmp_csa_settings, rcu_head); return ret; } return BSS_CHANGED_BEACON; } 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. Subtract 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; 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; 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); ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; if (!--ifmsh->chsw_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 (!sdata->vif.csa_active && !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, 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; case WLAN_CATEGORY_SPECTRUM_MGMT: mesh_rx_csa_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; sdata_lock(sdata); /* mesh already went down */ if (!sdata->u.mesh.mesh_id_len) goto out; 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; } out: sdata_unlock(sdata); } static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; u32 bit, changed = 0; for_each_set_bit(bit, &ifmsh->mbss_changed, sizeof(changed) * BITS_PER_BYTE) { clear_bit(bit, &ifmsh->mbss_changed); changed |= BIT(bit); } 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)) return; ieee80211_bss_info_change_notify(sdata, changed); } void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; sdata_lock(sdata); /* mesh already went down */ if (!sdata->u.mesh.mesh_id_len) goto out; 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_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); if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) mesh_bss_info_changed(sdata); out: sdata_unlock(sdata); } 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; atomic_set(&ifmsh->mpaths, 0); mesh_rmc_init(sdata); ifmsh->last_preq = jiffies; ifmsh->next_perr = jiffies; ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; /* Allocate all mesh structures when creating the first mesh interface. */ if (!mesh_allocated) ieee80211s_init(); mesh_pathtbl_init(sdata); 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); sdata->vif.bss_conf.bssid = zero_addr; }