diff options
Diffstat (limited to 'net/mac80211/mesh.c')
| -rw-r--r-- | net/mac80211/mesh.c | 1479 |
1 files changed, 1479 insertions, 0 deletions
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c new file mode 100644 index 000000000..3162f955f --- /dev/null +++ b/net/mac80211/mesh.c @@ -0,0 +1,1479 @@ +/* + * 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" +#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(struct timer_list *t) +{ + struct ieee80211_sub_if_data *sdata = + from_timer(sdata, t, u.mesh.housekeeping_timer); + 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; + struct ieee80211_supported_band *sband; + + /* + * 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; + + sband = ieee80211_get_sband(sdata); + if (!sband) + return false; + + ieee80211_sta_get_rates(sdata, ie, sband->band, + &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 = mesh_plink_deactivate(sta); + + 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_HLIST_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; + struct hlist_node *n; + int i; + + if (!sdata->u.mesh.rmc) + return; + + for (i = 0; i < RMC_BUCKETS; i++) { + hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { + hlist_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; + struct hlist_node *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; + hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { + ++entries; + if (time_after(jiffies, p->exp_time) || + entries == RMC_QUEUE_MAX_LEN) { + hlist_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); + hlist_add_head(&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; + 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 < ifmsh->ie_len) { + len = ifmsh->ie_len - offset; + data = ifmsh->ie + offset; + if (skb_tailroom(skb) < len) + return -ENOMEM; + skb_put_data(skb, 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; + skb_put_data(skb, 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_supported_band *sband; + u8 *pos; + + sband = ieee80211_get_sband(sdata); + if (!sband) + return -EINVAL; + + 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_supported_band *sband; + u8 *pos; + + sband = ieee80211_get_sband(sdata); + if (!sband) + return -EINVAL; + + 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(struct timer_list *t) +{ + struct ieee80211_sub_if_data *sdata = + from_timer(sdata, t, u.mesh.mesh_path_timer); + + ieee80211_queue_work(&sdata->local->hw, &sdata->work); +} + +static void ieee80211_mesh_path_root_timer(struct timer_list *t) +{ + struct ieee80211_sub_if_data *sdata = + from_timer(sdata, t, u.mesh.mesh_path_root_timer); + 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 nl80211_band band; + u8 *pos; + struct ieee80211_sub_if_data *sdata; + int hdr_len = offsetofend(struct ieee80211_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 Switch Parameters */ + 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + + /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ + 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) + + 2 + sizeof(struct ieee80211_sec_chan_offs_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 = skb_put_zero(skb, 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) { + enum nl80211_channel_type ct; + struct cfg80211_chan_def *chandef; + int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) + + 2 + sizeof(struct ieee80211_mesh_chansw_params_ie); + + pos = skb_put_zero(skb, ie_len); + *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; + + switch (csa->settings.chandef.width) { + case NL80211_CHAN_WIDTH_40: + ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie); + pos = skb_put_zero(skb, ie_len); + + *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */ + *pos++ = 1; /* len */ + ct = cfg80211_get_chandef_type(&csa->settings.chandef); + if (ct == NL80211_CHAN_HT40PLUS) + *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE; + else + *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW; + break; + case NL80211_CHAN_WIDTH_80: + case NL80211_CHAN_WIDTH_80P80: + case NL80211_CHAN_WIDTH_160: + /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ + ie_len = 2 + 2 + + sizeof(struct ieee80211_wide_bw_chansw_ie); + pos = skb_put_zero(skb, ie_len); + + *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */ + *pos++ = 5; /* len */ + /* put sub IE */ + chandef = &csa->settings.chandef; + ieee80211_ie_build_wide_bw_cs(pos, chandef); + break; + default: + break; + } + } + 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 | + BSS_CHANGED_MCAST_RATE; + + 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->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); + + /* flush STAs and mpaths on this iface */ + sta_info_flush(sdata); + ieee80211_free_keys(sdata, true); + mesh_path_flush_by_iface(sdata); + + /* 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); + + /* remove beacon */ + bcn = rcu_dereference_protected(ifmsh->beacon, + lockdep_is_held(&sdata->wdev.mtx)); + RCU_INIT_POINTER(ifmsh->beacon, NULL); + kfree_rcu(bcn, rcu_head); + + /* 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 void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata) +{ + int err; + + /* if the current channel is a DFS channel, mark the channel as + * unavailable. + */ + err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, + &sdata->vif.bss_conf.chandef, + NL80211_IFTYPE_MESH_POINT); + if (err > 0) + cfg80211_radar_event(sdata->local->hw.wiphy, + &sdata->vif.bss_conf.chandef, GFP_ATOMIC); +} + +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; + struct ieee80211_supported_band *sband; + int err; + u32 sta_flags; + + sdata_assert_lock(sdata); + + sband = ieee80211_get_sband(sdata); + if (!sband) + return false; + + sta_flags = 0; + switch (sdata->vif.bss_conf.chandef.width) { + case NL80211_CHAN_WIDTH_20_NOHT: + sta_flags |= IEEE80211_STA_DISABLE_HT; + /* fall through */ + case NL80211_CHAN_WIDTH_20: + sta_flags |= IEEE80211_STA_DISABLE_40MHZ; + /* fall through */ + case NL80211_CHAN_WIDTH_40: + sta_flags |= IEEE80211_STA_DISABLE_VHT; + break; + default: + break; + } + + memset(¶ms, 0, sizeof(params)); + err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band, + sta_flags, sdata->vif.addr, + &csa_ie); + if (err < 0) + return false; + if (err) + return false; + + /* Mark the channel unavailable if the reason for the switch is + * regulatory. + */ + if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY) + ieee80211_mesh_csa_mark_radar(sdata); + + params.chandef = csa_ie.chandef; + params.count = csa_ie.count; + + if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, + IEEE80211_CHAN_DISABLED) || + !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, + NL80211_IFTYPE_MESH_POINT)) { + 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 && !ifmsh->userspace_handles_dfs) { + sdata_info(sdata, + "mesh STA %pM switches to channel requiring DFS (%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; + } + + 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); + skb_put_data(presp, bcn->head, bcn->head_len); + skb_put_data(presp, 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 nl80211_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)) { + mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n", + sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal); + if (!sdata->u.mesh.user_mpm || + sdata->u.mesh.mshcfg.rssi_threshold == 0 || + sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal) + 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_protected(ifmsh->csa, + lockdep_is_held(&sdata->wdev.mtx)); + 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; + + lockdep_assert_held(&sdata->wdev.mtx); + + 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 ieee802_11_elems *elems) +{ + struct ieee80211_mgmt *mgmt_fwd; + struct sk_buff *skb; + struct ieee80211_local *local = sdata->local; + + skb = dev_alloc_skb(local->tx_headroom + len); + if (!skb) + return -ENOMEM; + skb_reserve(skb, local->tx_headroom); + mgmt_fwd = skb_put(skb, len); + + elems->mesh_chansw_params_ie->mesh_ttl--; + elems->mesh_chansw_params_ie->mesh_flags &= + ~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, true, &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, &elems) < 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_tsf(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] = {}; + + timer_setup(&ifmsh->housekeeping_timer, + ieee80211_mesh_housekeeping_timer, 0); + + 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); + + timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0); + timer_setup(&ifmsh->mesh_path_root_timer, + ieee80211_mesh_path_root_timer, 0); + 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; +} + +void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) +{ + mesh_rmc_free(sdata); + mesh_pathtbl_unregister(sdata); +} |