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1639 lines
45 KiB
1639 lines
45 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2008, 2009 open80211s Ltd. |
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* Copyright (C) 2018 - 2020 Intel Corporation |
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* Authors: Luis Carlos Cobo <[email protected]> |
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* Javier Cardona <[email protected]> |
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*/ |
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|
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#include <linux/slab.h> |
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#include <asm/unaligned.h> |
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#include "ieee80211_i.h" |
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#include "mesh.h" |
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#include "driver-ops.h" |
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|
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static int mesh_allocated; |
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static struct kmem_cache *rm_cache; |
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|
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bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt) |
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{ |
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return (mgmt->u.action.u.mesh_action.action_code == |
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WLAN_MESH_ACTION_HWMP_PATH_SELECTION); |
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} |
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|
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void ieee80211s_init(void) |
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{ |
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mesh_allocated = 1; |
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rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), |
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0, 0, NULL); |
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} |
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|
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void ieee80211s_stop(void) |
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{ |
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if (!mesh_allocated) |
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return; |
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kmem_cache_destroy(rm_cache); |
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} |
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|
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static void ieee80211_mesh_housekeeping_timer(struct timer_list *t) |
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{ |
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struct ieee80211_sub_if_data *sdata = |
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from_timer(sdata, t, u.mesh.housekeeping_timer); |
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struct ieee80211_local *local = sdata->local; |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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|
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set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); |
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|
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ieee80211_queue_work(&local->hw, &sdata->work); |
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} |
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|
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/** |
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* mesh_matches_local - check if the config of a mesh point matches ours |
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* |
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* @sdata: local mesh subif |
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* @ie: information elements of a management frame from the mesh peer |
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* |
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* This function checks if the mesh configuration of a mesh point matches the |
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* local mesh configuration, i.e. if both nodes belong to the same mesh network. |
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*/ |
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bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, |
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struct ieee802_11_elems *ie) |
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{ |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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u32 basic_rates = 0; |
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struct cfg80211_chan_def sta_chan_def; |
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struct ieee80211_supported_band *sband; |
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u32 vht_cap_info = 0; |
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|
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/* |
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* As support for each feature is added, check for matching |
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* - On mesh config capabilities |
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* - Power Save Support En |
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* - Sync support enabled |
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* - Sync support active |
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* - Sync support required from peer |
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* - MDA enabled |
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* - Power management control on fc |
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*/ |
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if (!(ifmsh->mesh_id_len == ie->mesh_id_len && |
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memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && |
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(ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) && |
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(ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) && |
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(ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) && |
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(ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) && |
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(ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))) |
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return false; |
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|
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sband = ieee80211_get_sband(sdata); |
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if (!sband) |
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return false; |
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|
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ieee80211_sta_get_rates(sdata, ie, sband->band, |
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&basic_rates); |
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|
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if (sdata->vif.bss_conf.basic_rates != basic_rates) |
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return false; |
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cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan, |
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NL80211_CHAN_NO_HT); |
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ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def); |
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if (ie->vht_cap_elem) |
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vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info); |
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ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info, |
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ie->vht_operation, ie->ht_operation, |
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&sta_chan_def); |
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ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, &sta_chan_def); |
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|
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if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef, |
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&sta_chan_def)) |
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return false; |
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|
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return true; |
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} |
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|
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/** |
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* mesh_peer_accepts_plinks - check if an mp is willing to establish peer links |
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* |
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* @ie: information elements of a management frame from the mesh peer |
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*/ |
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bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) |
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{ |
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return (ie->mesh_config->meshconf_cap & |
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IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; |
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} |
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|
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/** |
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* mesh_accept_plinks_update - update accepting_plink in local mesh beacons |
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* |
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* @sdata: mesh interface in which mesh beacons are going to be updated |
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* |
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* Returns: beacon changed flag if the beacon content changed. |
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*/ |
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u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) |
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{ |
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bool free_plinks; |
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u32 changed = 0; |
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|
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/* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, |
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* the mesh interface might be able to establish plinks with peers that |
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* are already on the table but are not on PLINK_ESTAB state. However, |
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* in general the mesh interface is not accepting peer link requests |
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* from new peers, and that must be reflected in the beacon |
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*/ |
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free_plinks = mesh_plink_availables(sdata); |
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|
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if (free_plinks != sdata->u.mesh.accepting_plinks) { |
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sdata->u.mesh.accepting_plinks = free_plinks; |
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changed = BSS_CHANGED_BEACON; |
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} |
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|
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return changed; |
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} |
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|
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/* |
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* mesh_sta_cleanup - clean up any mesh sta state |
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* |
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* @sta: mesh sta to clean up. |
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*/ |
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void mesh_sta_cleanup(struct sta_info *sta) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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u32 changed = mesh_plink_deactivate(sta); |
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|
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if (changed) |
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ieee80211_mbss_info_change_notify(sdata, changed); |
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} |
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int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) |
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{ |
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int i; |
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sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); |
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if (!sdata->u.mesh.rmc) |
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return -ENOMEM; |
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sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; |
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for (i = 0; i < RMC_BUCKETS; i++) |
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INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); |
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return 0; |
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} |
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void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) |
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{ |
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struct mesh_rmc *rmc = sdata->u.mesh.rmc; |
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struct rmc_entry *p; |
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struct hlist_node *n; |
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int i; |
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|
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if (!sdata->u.mesh.rmc) |
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return; |
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for (i = 0; i < RMC_BUCKETS; i++) { |
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hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { |
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hlist_del(&p->list); |
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kmem_cache_free(rm_cache, p); |
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} |
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} |
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kfree(rmc); |
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sdata->u.mesh.rmc = NULL; |
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} |
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/** |
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* mesh_rmc_check - Check frame in recent multicast cache and add if absent. |
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* |
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* @sdata: interface |
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* @sa: source address |
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* @mesh_hdr: mesh_header |
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* |
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* Returns: 0 if the frame is not in the cache, nonzero otherwise. |
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* |
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* Checks using the source address and the mesh sequence number if we have |
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* received this frame lately. If the frame is not in the cache, it is added to |
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* it. |
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*/ |
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int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, |
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const u8 *sa, struct ieee80211s_hdr *mesh_hdr) |
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{ |
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struct mesh_rmc *rmc = sdata->u.mesh.rmc; |
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u32 seqnum = 0; |
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int entries = 0; |
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u8 idx; |
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struct rmc_entry *p; |
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struct hlist_node *n; |
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|
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if (!rmc) |
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return -1; |
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/* Don't care about endianness since only match matters */ |
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memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); |
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idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; |
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hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { |
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++entries; |
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if (time_after(jiffies, p->exp_time) || |
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entries == RMC_QUEUE_MAX_LEN) { |
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hlist_del(&p->list); |
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kmem_cache_free(rm_cache, p); |
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--entries; |
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} else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) |
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return -1; |
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} |
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p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); |
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if (!p) |
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return 0; |
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p->seqnum = seqnum; |
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p->exp_time = jiffies + RMC_TIMEOUT; |
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memcpy(p->sa, sa, ETH_ALEN); |
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hlist_add_head(&p->list, &rmc->bucket[idx]); |
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return 0; |
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} |
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int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb) |
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{ |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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u8 *pos, neighbors; |
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u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); |
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bool is_connected_to_gate = ifmsh->num_gates > 0 || |
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ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol || |
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ifmsh->mshcfg.dot11MeshConnectedToMeshGate; |
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bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer; |
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if (skb_tailroom(skb) < 2 + meshconf_len) |
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return -ENOMEM; |
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pos = skb_put(skb, 2 + meshconf_len); |
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*pos++ = WLAN_EID_MESH_CONFIG; |
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*pos++ = meshconf_len; |
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/* save a pointer for quick updates in pre-tbtt */ |
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ifmsh->meshconf_offset = pos - skb->data; |
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/* Active path selection protocol ID */ |
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*pos++ = ifmsh->mesh_pp_id; |
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/* Active path selection metric ID */ |
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*pos++ = ifmsh->mesh_pm_id; |
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/* Congestion control mode identifier */ |
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*pos++ = ifmsh->mesh_cc_id; |
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/* Synchronization protocol identifier */ |
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*pos++ = ifmsh->mesh_sp_id; |
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/* Authentication Protocol identifier */ |
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*pos++ = ifmsh->mesh_auth_id; |
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/* Mesh Formation Info - number of neighbors */ |
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neighbors = atomic_read(&ifmsh->estab_plinks); |
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neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); |
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*pos++ = (is_connected_to_as << 7) | |
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(neighbors << 1) | |
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is_connected_to_gate; |
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/* Mesh capability */ |
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*pos = 0x00; |
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*pos |= ifmsh->mshcfg.dot11MeshForwarding ? |
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IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; |
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*pos |= ifmsh->accepting_plinks ? |
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IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; |
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/* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */ |
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*pos |= ifmsh->ps_peers_deep_sleep ? |
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IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00; |
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return 0; |
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} |
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int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
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{ |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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u8 *pos; |
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if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) |
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return -ENOMEM; |
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pos = skb_put(skb, 2 + ifmsh->mesh_id_len); |
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*pos++ = WLAN_EID_MESH_ID; |
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*pos++ = ifmsh->mesh_id_len; |
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if (ifmsh->mesh_id_len) |
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memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); |
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return 0; |
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} |
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static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb) |
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{ |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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u8 *pos; |
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/* see IEEE802.11-2012 13.14.6 */ |
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if (ifmsh->ps_peers_light_sleep == 0 && |
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ifmsh->ps_peers_deep_sleep == 0 && |
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ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE) |
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return 0; |
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if (skb_tailroom(skb) < 4) |
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return -ENOMEM; |
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pos = skb_put(skb, 2 + 2); |
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*pos++ = WLAN_EID_MESH_AWAKE_WINDOW; |
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*pos++ = 2; |
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put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos); |
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return 0; |
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} |
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int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb) |
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{ |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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u8 offset, len; |
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const u8 *data; |
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if (!ifmsh->ie || !ifmsh->ie_len) |
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return 0; |
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/* fast-forward to vendor IEs */ |
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offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); |
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if (offset < ifmsh->ie_len) { |
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len = ifmsh->ie_len - offset; |
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data = ifmsh->ie + offset; |
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if (skb_tailroom(skb) < len) |
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return -ENOMEM; |
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skb_put_data(skb, data, len); |
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} |
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return 0; |
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} |
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int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
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{ |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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u8 len = 0; |
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const u8 *data; |
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if (!ifmsh->ie || !ifmsh->ie_len) |
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return 0; |
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/* find RSN IE */ |
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data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); |
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if (!data) |
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return 0; |
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len = data[1] + 2; |
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if (skb_tailroom(skb) < len) |
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return -ENOMEM; |
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skb_put_data(skb, data, len); |
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return 0; |
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} |
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static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb) |
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{ |
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struct ieee80211_chanctx_conf *chanctx_conf; |
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struct ieee80211_channel *chan; |
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u8 *pos; |
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|
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if (skb_tailroom(skb) < 3) |
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return -ENOMEM; |
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rcu_read_lock(); |
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chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
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if (WARN_ON(!chanctx_conf)) { |
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rcu_read_unlock(); |
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return -EINVAL; |
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} |
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chan = chanctx_conf->def.chan; |
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rcu_read_unlock(); |
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|
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pos = skb_put(skb, 2 + 1); |
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*pos++ = WLAN_EID_DS_PARAMS; |
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*pos++ = 1; |
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*pos++ = ieee80211_frequency_to_channel(chan->center_freq); |
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|
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return 0; |
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} |
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|
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int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb) |
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{ |
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struct ieee80211_supported_band *sband; |
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u8 *pos; |
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|
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sband = ieee80211_get_sband(sdata); |
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if (!sband) |
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return -EINVAL; |
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|
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/* HT not allowed in 6 GHz */ |
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if (sband->band == NL80211_BAND_6GHZ) |
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return 0; |
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|
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if (!sband->ht_cap.ht_supported || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) |
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return 0; |
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|
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if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap)) |
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return -ENOMEM; |
|
|
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pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap)); |
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ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap); |
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|
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return 0; |
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} |
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|
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int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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struct ieee80211_chanctx_conf *chanctx_conf; |
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struct ieee80211_channel *channel; |
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struct ieee80211_supported_band *sband; |
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struct ieee80211_sta_ht_cap *ht_cap; |
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u8 *pos; |
|
|
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rcu_read_lock(); |
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chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
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if (WARN_ON(!chanctx_conf)) { |
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rcu_read_unlock(); |
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return -EINVAL; |
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} |
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channel = chanctx_conf->def.chan; |
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rcu_read_unlock(); |
|
|
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sband = local->hw.wiphy->bands[channel->band]; |
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ht_cap = &sband->ht_cap; |
|
|
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/* HT not allowed in 6 GHz */ |
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if (sband->band == NL80211_BAND_6GHZ) |
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return 0; |
|
|
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if (!ht_cap->ht_supported || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) |
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return 0; |
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|
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if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation)) |
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return -ENOMEM; |
|
|
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pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); |
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ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef, |
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sdata->vif.bss_conf.ht_operation_mode, |
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false); |
|
|
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return 0; |
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} |
|
|
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int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb) |
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{ |
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struct ieee80211_supported_band *sband; |
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u8 *pos; |
|
|
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sband = ieee80211_get_sband(sdata); |
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if (!sband) |
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return -EINVAL; |
|
|
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/* VHT not allowed in 6 GHz */ |
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if (sband->band == NL80211_BAND_6GHZ) |
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return 0; |
|
|
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if (!sband->vht_cap.vht_supported || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || |
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) |
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return 0; |
|
|
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if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap)) |
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return -ENOMEM; |
|
|
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pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap)); |
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ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap); |
|
|
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return 0; |
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} |
|
|
|
int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, |
|
struct sk_buff *skb) |
|
{ |
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struct ieee80211_local *local = sdata->local; |
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struct ieee80211_chanctx_conf *chanctx_conf; |
|
struct ieee80211_channel *channel; |
|
struct ieee80211_supported_band *sband; |
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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; |
|
|
|
/* VHT not allowed in 6 GHz */ |
|
if (sband->band == NL80211_BAND_6GHZ) |
|
return 0; |
|
|
|
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; |
|
} |
|
|
|
int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata, |
|
struct sk_buff *skb, u8 ie_len) |
|
{ |
|
const struct ieee80211_sta_he_cap *he_cap; |
|
struct ieee80211_supported_band *sband; |
|
u8 *pos; |
|
|
|
sband = ieee80211_get_sband(sdata); |
|
if (!sband) |
|
return -EINVAL; |
|
|
|
he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT); |
|
|
|
if (!he_cap || |
|
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) < ie_len) |
|
return -ENOMEM; |
|
|
|
pos = skb_put(skb, ie_len); |
|
ieee80211_ie_build_he_cap(pos, he_cap, pos + ie_len); |
|
|
|
return 0; |
|
} |
|
|
|
int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata, |
|
struct sk_buff *skb) |
|
{ |
|
const struct ieee80211_sta_he_cap *he_cap; |
|
struct ieee80211_supported_band *sband; |
|
u32 len; |
|
u8 *pos; |
|
|
|
sband = ieee80211_get_sband(sdata); |
|
if (!sband) |
|
return -EINVAL; |
|
|
|
he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT); |
|
if (!he_cap || |
|
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; |
|
|
|
len = 2 + 1 + sizeof(struct ieee80211_he_operation); |
|
if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ) |
|
len += sizeof(struct ieee80211_he_6ghz_oper); |
|
|
|
if (skb_tailroom(skb) < len) |
|
return -ENOMEM; |
|
|
|
pos = skb_put(skb, len); |
|
ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef); |
|
|
|
return 0; |
|
} |
|
|
|
int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata, |
|
struct sk_buff *skb) |
|
{ |
|
struct ieee80211_supported_band *sband; |
|
const struct ieee80211_sband_iftype_data *iftd; |
|
|
|
sband = ieee80211_get_sband(sdata); |
|
if (!sband) |
|
return -EINVAL; |
|
|
|
iftd = ieee80211_get_sband_iftype_data(sband, |
|
NL80211_IFTYPE_MESH_POINT); |
|
/* The device doesn't support HE in mesh mode or at all */ |
|
if (!iftd) |
|
return 0; |
|
|
|
ieee80211_ie_build_he_6ghz_cap(sdata, skb); |
|
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); |
|
} |
|
} |
|
|
|
static void |
|
ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata, |
|
u8 *ie, u8 ie_len) |
|
{ |
|
struct ieee80211_supported_band *sband; |
|
const u8 *cap; |
|
const struct ieee80211_he_operation *he_oper = NULL; |
|
|
|
sband = ieee80211_get_sband(sdata); |
|
if (!sband) |
|
return; |
|
|
|
if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) || |
|
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; |
|
|
|
sdata->vif.bss_conf.he_support = true; |
|
|
|
cap = cfg80211_find_ext_ie(WLAN_EID_EXT_HE_OPERATION, ie, ie_len); |
|
if (cap && cap[1] >= ieee80211_he_oper_size(&cap[3])) |
|
he_oper = (void *)(cap + 3); |
|
|
|
if (he_oper) |
|
sdata->vif.bss_conf.he_oper.params = |
|
__le32_to_cpu(he_oper->he_oper_params); |
|
} |
|
|
|
/** |
|
* 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 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 ie_len_he_cap; |
|
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(); |
|
|
|
ie_len_he_cap = ieee80211_ie_len_he_cap(sdata, |
|
NL80211_IFTYPE_MESH_POINT); |
|
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) + |
|
ie_len_he_cap + |
|
2 + 1 + sizeof(struct ieee80211_he_operation) + |
|
sizeof(struct ieee80211_he_6ghz_oper) + |
|
2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + |
|
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->cntdwn_current_counter = csa->settings.count; |
|
bcn->cntdwn_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_he_cap_ie(sdata, skb, ie_len_he_cap) || |
|
mesh_add_he_oper_ie(sdata, skb) || |
|
mesh_add_he_6ghz_cap_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); |
|
ieee80211_mesh_update_bss_params(sdata, bcn->tail, 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; |
|
sdata->beacon_rate_set = 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, vht_cap_info = 0; |
|
|
|
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; |
|
fallthrough; |
|
case NL80211_CHAN_WIDTH_20: |
|
sta_flags |= IEEE80211_STA_DISABLE_40MHZ; |
|
fallthrough; |
|
case NL80211_CHAN_WIDTH_40: |
|
sta_flags |= IEEE80211_STA_DISABLE_VHT; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
if (elems->vht_cap_elem) |
|
vht_cap_info = |
|
le32_to_cpu(elems->vht_cap_elem->vht_cap_info); |
|
|
|
memset(¶ms, 0, sizeof(params)); |
|
err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band, |
|
vht_cap_info, |
|
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, mgmt->bssid, |
|
NULL); |
|
|
|
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, mgmt->bssid, NULL); |
|
|
|
/* 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, |
|
rx_status); |
|
|
|
if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && |
|
!sdata->vif.csa_active) |
|
ieee80211_mesh_process_chnswitch(sdata, &elems, true); |
|
} |
|
|
|
if (ifmsh->sync_ops) |
|
ifmsh->sync_ops->rx_bcn_presp(sdata, |
|
stype, mgmt, &elems, rx_status); |
|
} |
|
|
|
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, |
|
mgmt->bssid, NULL); |
|
|
|
if (!mesh_matches_local(sdata, &elems)) |
|
return; |
|
|
|
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); |
|
}
|
|
|