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mesh.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2008, 2009 open80211s Ltd.
* Copyright (C) 2018 - 2020 Intel Corporation
* Authors: Luis Carlos Cobo <[email protected]>
* Javier Cardona <[email protected]>
*/
#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;
u32 vht_cap_info = 0;
/*
* 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);
if (ie->vht_cap_elem)
vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
ie->vht_operation, ie->ht_operation,
&sta_chan_def);
ieee80211_chandef_he_6ghz_oper(sdata, ie->he_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);
bool is_connected_to_gate = ifmsh->num_gates > 0 ||
ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
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++ = (is_connected_to_as << 7) |
(neighbors << 1) |
is_connected_to_gate;
/* 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;
/* HT not allowed in 6 GHz */
if (sband->band == NL80211_BAND_6GHZ)
return 0;
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;
/* HT not allowed in 6 GHz */
if (sband->band == NL80211_BAND_6GHZ)
return 0;
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;
/* VHT not allowed in 6 GHz */
if (sband->band == NL80211_BAND_6GHZ)
return 0;
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;
/* 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;