linux/net/mac80211/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 <luisca@cozybit.com>
* Javier Cardona <javier@cozybit.com>
*/
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#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;
mac80211: Fix possible sband related NULL pointer de-reference Existing API 'ieee80211_get_sdata_band' returns default 2 GHz band even if the channel context configuration is NULL. This crashes for chipsets which support 5 Ghz alone when it tries to access members of 'sband'. Channel context configuration can be NULL in multivif case and when channel switch is in progress (or) when it fails. Fix this by replacing the API 'ieee80211_get_sdata_band' with 'ieee80211_get_sband' which returns a NULL pointer for sband when the channel configuration is NULL. An example scenario is as below: In multivif mode (AP + STA) with drivers like ath10k, when we do a channel switch in the AP vif (which has a number of clients connected) and a STA vif which is connected to some other AP, when the channel switch in AP vif fails, while the STA vifs tries to connect to the other AP, there is a window where the channel context is NULL/invalid and this results in a crash while the clients connected to the AP vif tries to reconnect and this race is very similar to the one investigated by Michal in https://patchwork.kernel.org/patch/3788161/ and this does happens with hardware that supports 5Ghz alone after long hours of testing with continuous channel switch on the AP vif ieee80211 phy0: channel context reservation cannot be finalized because some interfaces aren't switching wlan0: failed to finalize CSA, disconnecting wlan0-1: deauthenticating from 8c:fd:f0:01:54:9c by local choice (Reason: 3=DEAUTH_LEAVING) WARNING: CPU: 1 PID: 19032 at net/mac80211/ieee80211_i.h:1013 sta_info_alloc+0x374/0x3fc [mac80211] [<bf77272c>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211])) [<bf73cc50>] (nl80211_new_station [cfg80211]) Unable to handle kernel NULL pointer dereference at virtual address 00000014 pgd = d5f4c000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM PC is at sta_info_alloc+0x380/0x3fc [mac80211] LR is at sta_info_alloc+0x37c/0x3fc [mac80211] [<bf772738>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211]) [<bf73cc50>] (nl80211_new_station [cfg80211])) Cc: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-04-27 15:15:38 +08:00
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;
mac80211: Fix possible sband related NULL pointer de-reference Existing API 'ieee80211_get_sdata_band' returns default 2 GHz band even if the channel context configuration is NULL. This crashes for chipsets which support 5 Ghz alone when it tries to access members of 'sband'. Channel context configuration can be NULL in multivif case and when channel switch is in progress (or) when it fails. Fix this by replacing the API 'ieee80211_get_sdata_band' with 'ieee80211_get_sband' which returns a NULL pointer for sband when the channel configuration is NULL. An example scenario is as below: In multivif mode (AP + STA) with drivers like ath10k, when we do a channel switch in the AP vif (which has a number of clients connected) and a STA vif which is connected to some other AP, when the channel switch in AP vif fails, while the STA vifs tries to connect to the other AP, there is a window where the channel context is NULL/invalid and this results in a crash while the clients connected to the AP vif tries to reconnect and this race is very similar to the one investigated by Michal in https://patchwork.kernel.org/patch/3788161/ and this does happens with hardware that supports 5Ghz alone after long hours of testing with continuous channel switch on the AP vif ieee80211 phy0: channel context reservation cannot be finalized because some interfaces aren't switching wlan0: failed to finalize CSA, disconnecting wlan0-1: deauthenticating from 8c:fd:f0:01:54:9c by local choice (Reason: 3=DEAUTH_LEAVING) WARNING: CPU: 1 PID: 19032 at net/mac80211/ieee80211_i.h:1013 sta_info_alloc+0x374/0x3fc [mac80211] [<bf77272c>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211])) [<bf73cc50>] (nl80211_new_station [cfg80211]) Unable to handle kernel NULL pointer dereference at virtual address 00000014 pgd = d5f4c000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM PC is at sta_info_alloc+0x380/0x3fc [mac80211] LR is at sta_info_alloc+0x37c/0x3fc [mac80211] [<bf772738>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211]) [<bf73cc50>] (nl80211_new_station [cfg80211])) Cc: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-04-27 15:15:38 +08:00
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);
mac80211: mesh: flush mesh paths unconditionally Currently, the mesh paths associated with a nexthop station are cleaned up in the following code path: __sta_info_destroy_part1 synchronize_net() __sta_info_destroy_part2 -> cleanup_single_sta -> mesh_sta_cleanup -> mesh_plink_deactivate -> mesh_path_flush_by_nexthop However, there are a couple of problems here: 1) the paths aren't flushed at all if the MPM is running in userspace (e.g. when using wpa_supplicant or authsae) 2) there is no synchronize_rcu between removing the path and readers accessing the nexthop, which means the following race is possible: CPU0 CPU1 ~~~~ ~~~~ sta_info_destroy_part1() synchronize_net() rcu_read_lock() mesh_nexthop_resolve() mpath = mesh_path_lookup() [...] -> mesh_path_flush_by_nexthop() sta = rcu_dereference( mpath->next_hop) kfree(sta) access sta <-- CRASH Fix both of these by unconditionally flushing paths before destroying the sta, and by adding a synchronize_net() after path flush to ensure no active readers can still dereference the sta. Fixes this crash: [ 348.529295] BUG: unable to handle kernel paging request at 00020040 [ 348.530014] IP: [<f929245d>] ieee80211_mps_set_frame_flags+0x40/0xaa [mac80211] [ 348.530014] *pde = 00000000 [ 348.530014] Oops: 0000 [#1] PREEMPT [ 348.530014] Modules linked in: drbg ansi_cprng ctr ccm ppp_generic slhc ipt_MASQUERADE nf_nat_masquerade_ipv4 8021q ] [ 348.530014] CPU: 0 PID: 20597 Comm: wget Tainted: G O 4.6.0-rc5-wt=V1 #1 [ 348.530014] Hardware name: To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080016 11/07/2014 [ 348.530014] task: f64fa280 ti: f4f9c000 task.ti: f4f9c000 [ 348.530014] EIP: 0060:[<f929245d>] EFLAGS: 00010246 CPU: 0 [ 348.530014] EIP is at ieee80211_mps_set_frame_flags+0x40/0xaa [mac80211] [ 348.530014] EAX: f4ce63e0 EBX: 00000088 ECX: f3788416 EDX: 00020008 [ 348.530014] ESI: 00000000 EDI: 00000088 EBP: f6409a4c ESP: f6409a40 [ 348.530014] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 [ 348.530014] CR0: 80050033 CR2: 00020040 CR3: 33190000 CR4: 00000690 [ 348.530014] Stack: [ 348.530014] 00000000 f4ce63e0 f5f9bd80 f6409a64 f9291d80 0000ce67 f5d51e00 f4ce63e0 [ 348.530014] f3788416 f6409a80 f9291dc1 f4ce8320 f4ce63e0 f5d51e00 f4ce63e0 f4ce8320 [ 348.530014] f6409a98 f9277f6f 00000000 00000000 0000007c 00000000 f6409b2c f9278dd1 [ 348.530014] Call Trace: [ 348.530014] [<f9291d80>] mesh_nexthop_lookup+0xbb/0xc8 [mac80211] [ 348.530014] [<f9291dc1>] mesh_nexthop_resolve+0x34/0xd8 [mac80211] [ 348.530014] [<f9277f6f>] ieee80211_xmit+0x92/0xc1 [mac80211] [ 348.530014] [<f9278dd1>] __ieee80211_subif_start_xmit+0x807/0x83c [mac80211] [ 348.530014] [<c04df012>] ? sch_direct_xmit+0xd7/0x1b3 [ 348.530014] [<c022a8c6>] ? __local_bh_enable_ip+0x5d/0x7b [ 348.530014] [<f956870c>] ? nf_nat_ipv4_out+0x4c/0xd0 [nf_nat_ipv4] [ 348.530014] [<f957e036>] ? iptable_nat_ipv4_fn+0xf/0xf [iptable_nat] [ 348.530014] [<c04c6f45>] ? netif_skb_features+0x14d/0x30a [ 348.530014] [<f9278e10>] ieee80211_subif_start_xmit+0xa/0xe [mac80211] [ 348.530014] [<c04c769c>] dev_hard_start_xmit+0x1f8/0x267 [ 348.530014] [<c04c7261>] ? validate_xmit_skb.isra.120.part.121+0x10/0x253 [ 348.530014] [<c04defc6>] sch_direct_xmit+0x8b/0x1b3 [ 348.530014] [<c04c7a9c>] __dev_queue_xmit+0x2c8/0x513 [ 348.530014] [<c04c7cfb>] dev_queue_xmit+0xa/0xc [ 348.530014] [<f91bfc7a>] batadv_send_skb_packet+0xd6/0xec [batman_adv] [ 348.530014] [<f91bfdc4>] batadv_send_unicast_skb+0x15/0x4a [batman_adv] [ 348.530014] [<f91b5938>] batadv_dat_send_data+0x27e/0x310 [batman_adv] [ 348.530014] [<f91c30b5>] ? batadv_tt_global_hash_find.isra.11+0x8/0xa [batman_adv] [ 348.530014] [<f91b63f3>] batadv_dat_snoop_outgoing_arp_request+0x208/0x23d [batman_adv] [ 348.530014] [<f91c0cd9>] batadv_interface_tx+0x206/0x385 [batman_adv] [ 348.530014] [<c04c769c>] dev_hard_start_xmit+0x1f8/0x267 [ 348.530014] [<c04c7261>] ? validate_xmit_skb.isra.120.part.121+0x10/0x253 [ 348.530014] [<c04defc6>] sch_direct_xmit+0x8b/0x1b3 [ 348.530014] [<c04c7a9c>] __dev_queue_xmit+0x2c8/0x513 [ 348.530014] [<f80cbd2a>] ? igb_xmit_frame+0x57/0x72 [igb] [ 348.530014] [<c04c7cfb>] dev_queue_xmit+0xa/0xc [ 348.530014] [<f843a326>] br_dev_queue_push_xmit+0xeb/0xfb [bridge] [ 348.530014] [<f843a35f>] br_forward_finish+0x29/0x74 [bridge] [ 348.530014] [<f843a23b>] ? deliver_clone+0x3b/0x3b [bridge] [ 348.530014] [<f843a714>] __br_forward+0x89/0xe7 [bridge] [ 348.530014] [<f843a336>] ? br_dev_queue_push_xmit+0xfb/0xfb [bridge] [ 348.530014] [<f843a234>] deliver_clone+0x34/0x3b [bridge] [ 348.530014] [<f843a68b>] ? br_flood+0x95/0x95 [bridge] [ 348.530014] [<f843a66d>] br_flood+0x77/0x95 [bridge] [ 348.530014] [<f843a809>] br_flood_forward+0x13/0x1a [bridge] [ 348.530014] [<f843a68b>] ? br_flood+0x95/0x95 [bridge] [ 348.530014] [<f843b877>] br_handle_frame_finish+0x392/0x3db [bridge] [ 348.530014] [<c04e9b2b>] ? nf_iterate+0x2b/0x6b [ 348.530014] [<f843baa6>] br_handle_frame+0x1e6/0x240 [bridge] [ 348.530014] [<f843b4e5>] ? br_handle_local_finish+0x6a/0x6a [bridge] [ 348.530014] [<c04c4ba0>] __netif_receive_skb_core+0x43a/0x66b [ 348.530014] [<f843b8c0>] ? br_handle_frame_finish+0x3db/0x3db [bridge] [ 348.530014] [<c023cea4>] ? resched_curr+0x19/0x37 [ 348.530014] [<c0240707>] ? check_preempt_wakeup+0xbf/0xfe [ 348.530014] [<c0255dec>] ? ktime_get_with_offset+0x5c/0xfc [ 348.530014] [<c04c4fc1>] __netif_receive_skb+0x47/0x55 [ 348.530014] [<c04c57ba>] netif_receive_skb_internal+0x40/0x5a [ 348.530014] [<c04c61ef>] napi_gro_receive+0x3a/0x94 [ 348.530014] [<f80ce8d5>] igb_poll+0x6fd/0x9ad [igb] [ 348.530014] [<c0242bd8>] ? swake_up_locked+0x14/0x26 [ 348.530014] [<c04c5d29>] net_rx_action+0xde/0x250 [ 348.530014] [<c022a743>] __do_softirq+0x8a/0x163 [ 348.530014] [<c022a6b9>] ? __hrtimer_tasklet_trampoline+0x19/0x19 [ 348.530014] [<c021100f>] do_softirq_own_stack+0x26/0x2c [ 348.530014] <IRQ> [ 348.530014] [<c022a957>] irq_exit+0x31/0x6f [ 348.530014] [<c0210eb2>] do_IRQ+0x8d/0xa0 [ 348.530014] [<c058152c>] common_interrupt+0x2c/0x40 [ 348.530014] Code: e7 8c 00 66 81 ff 88 00 75 12 85 d2 75 0e b2 c3 b8 83 e9 29 f9 e8 a7 5f f9 c6 eb 74 66 81 e3 8c 005 [ 348.530014] EIP: [<f929245d>] ieee80211_mps_set_frame_flags+0x40/0xaa [mac80211] SS:ESP 0068:f6409a40 [ 348.530014] CR2: 0000000000020040 [ 348.530014] ---[ end trace 48556ac26779732e ]--- [ 348.530014] Kernel panic - not syncing: Fatal exception in interrupt [ 348.530014] Kernel Offset: disabled Cc: stable@vger.kernel.org Reported-by: Fred Veldini <fred.veldini@gmail.com> Tested-by: Fred Veldini <fred.veldini@gmail.com> Signed-off-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2016-05-16 01:19:16 +08:00
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;
mac80211: mesh power save basics Add routines to - maintain a PS mode for each peer and a non-peer PS mode - indicate own PS mode in transmitted frames - track neighbor STAs power modes - buffer frames when neighbors are in PS mode - add TIM and Awake Window IE to beacons - release frames in Mesh Peer Service Periods Add local_pm to sta_info to represent the link-specific power mode at this station towards the remote station. When a peer link is established, use the default power mode stored in mesh config. Update the PS status if the peering status of a neighbor changes. Maintain a mesh power mode for non-peer mesh STAs. Set the non-peer power mode to active mode during peering. Authenticated mesh peering is currently not working when either node is configured to be in power save mode. Indicate the current power mode in transmitted frames. Use QoS Nulls to indicate mesh power mode transitions. For performance reasons, calls to the function setting the frame flags are placed in HWMP routing routines, as there the STA pointer is already available. Add peer_pm to sta_info to represent the peer's link-specific power mode towards the local station. Add nonpeer_pm to represent the peer's power mode towards all non-peer stations. Track power modes based on received frames. Add the ps_data structure to ieee80211_if_mesh (for TIM map, PS neighbor counter and group-addressed frame buffer). Set WLAN_STA_PS flag for STA in PS mode to use the unicast frame buffering routines in the tx path. Update num_sta_ps to buffer and release group-addressed frames after DTIM beacons. Announce the awake window duration in beacons if in light or deep sleep mode towards any peer or non-peer. Create a TIM IE similarly to AP mode and add it to mesh beacons. Parse received Awake Window IEs and check TIM IEs for buffered frames. Release frames towards peers in mesh Peer Service Periods. Use the corresponding trigger frames and monitor the MPSP status. Append a QoS Null as trigger frame if neccessary to properly end the MPSP. Currently, in HT channels MPSPs behave imperfectly and show large delay spikes and frame losses. Signed-off-by: Marco Porsch <marco@cozybit.com> Signed-off-by: Ivan Bezyazychnyy <ivan.bezyazychnyy@gmail.com> Signed-off-by: Mike Krinkin <krinkin.m.u@gmail.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-01-31 01:14:08 +08:00
/* 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)
mac80211: mesh power save basics Add routines to - maintain a PS mode for each peer and a non-peer PS mode - indicate own PS mode in transmitted frames - track neighbor STAs power modes - buffer frames when neighbors are in PS mode - add TIM and Awake Window IE to beacons - release frames in Mesh Peer Service Periods Add local_pm to sta_info to represent the link-specific power mode at this station towards the remote station. When a peer link is established, use the default power mode stored in mesh config. Update the PS status if the peering status of a neighbor changes. Maintain a mesh power mode for non-peer mesh STAs. Set the non-peer power mode to active mode during peering. Authenticated mesh peering is currently not working when either node is configured to be in power save mode. Indicate the current power mode in transmitted frames. Use QoS Nulls to indicate mesh power mode transitions. For performance reasons, calls to the function setting the frame flags are placed in HWMP routing routines, as there the STA pointer is already available. Add peer_pm to sta_info to represent the peer's link-specific power mode towards the local station. Add nonpeer_pm to represent the peer's power mode towards all non-peer stations. Track power modes based on received frames. Add the ps_data structure to ieee80211_if_mesh (for TIM map, PS neighbor counter and group-addressed frame buffer). Set WLAN_STA_PS flag for STA in PS mode to use the unicast frame buffering routines in the tx path. Update num_sta_ps to buffer and release group-addressed frames after DTIM beacons. Announce the awake window duration in beacons if in light or deep sleep mode towards any peer or non-peer. Create a TIM IE similarly to AP mode and add it to mesh beacons. Parse received Awake Window IEs and check TIM IEs for buffered frames. Release frames towards peers in mesh Peer Service Periods. Use the corresponding trigger frames and monitor the MPSP status. Append a QoS Null as trigger frame if neccessary to properly end the MPSP. Currently, in HT channels MPSPs behave imperfectly and show large delay spikes and frame losses. Signed-off-by: Marco Porsch <marco@cozybit.com> Signed-off-by: Ivan Bezyazychnyy <ivan.bezyazychnyy@gmail.com> Signed-off-by: Mike Krinkin <krinkin.m.u@gmail.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-01-31 01:14:08 +08:00
{
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;
mac80211: Fix possible sband related NULL pointer de-reference Existing API 'ieee80211_get_sdata_band' returns default 2 GHz band even if the channel context configuration is NULL. This crashes for chipsets which support 5 Ghz alone when it tries to access members of 'sband'. Channel context configuration can be NULL in multivif case and when channel switch is in progress (or) when it fails. Fix this by replacing the API 'ieee80211_get_sdata_band' with 'ieee80211_get_sband' which returns a NULL pointer for sband when the channel configuration is NULL. An example scenario is as below: In multivif mode (AP + STA) with drivers like ath10k, when we do a channel switch in the AP vif (which has a number of clients connected) and a STA vif which is connected to some other AP, when the channel switch in AP vif fails, while the STA vifs tries to connect to the other AP, there is a window where the channel context is NULL/invalid and this results in a crash while the clients connected to the AP vif tries to reconnect and this race is very similar to the one investigated by Michal in https://patchwork.kernel.org/patch/3788161/ and this does happens with hardware that supports 5Ghz alone after long hours of testing with continuous channel switch on the AP vif ieee80211 phy0: channel context reservation cannot be finalized because some interfaces aren't switching wlan0: failed to finalize CSA, disconnecting wlan0-1: deauthenticating from 8c:fd:f0:01:54:9c by local choice (Reason: 3=DEAUTH_LEAVING) WARNING: CPU: 1 PID: 19032 at net/mac80211/ieee80211_i.h:1013 sta_info_alloc+0x374/0x3fc [mac80211] [<bf77272c>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211])) [<bf73cc50>] (nl80211_new_station [cfg80211]) Unable to handle kernel NULL pointer dereference at virtual address 00000014 pgd = d5f4c000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM PC is at sta_info_alloc+0x380/0x3fc [mac80211] LR is at sta_info_alloc+0x37c/0x3fc [mac80211] [<bf772738>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211]) [<bf73cc50>] (nl80211_new_station [cfg80211])) Cc: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-04-27 15:15:38 +08:00
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;
mac80211: Fix possible sband related NULL pointer de-reference Existing API 'ieee80211_get_sdata_band' returns default 2 GHz band even if the channel context configuration is NULL. This crashes for chipsets which support 5 Ghz alone when it tries to access members of 'sband'. Channel context configuration can be NULL in multivif case and when channel switch is in progress (or) when it fails. Fix this by replacing the API 'ieee80211_get_sdata_band' with 'ieee80211_get_sband' which returns a NULL pointer for sband when the channel configuration is NULL. An example scenario is as below: In multivif mode (AP + STA) with drivers like ath10k, when we do a channel switch in the AP vif (which has a number of clients connected) and a STA vif which is connected to some other AP, when the channel switch in AP vif fails, while the STA vifs tries to connect to the other AP, there is a window where the channel context is NULL/invalid and this results in a crash while the clients connected to the AP vif tries to reconnect and this race is very similar to the one investigated by Michal in https://patchwork.kernel.org/patch/3788161/ and this does happens with hardware that supports 5Ghz alone after long hours of testing with continuous channel switch on the AP vif ieee80211 phy0: channel context reservation cannot be finalized because some interfaces aren't switching wlan0: failed to finalize CSA, disconnecting wlan0-1: deauthenticating from 8c:fd:f0:01:54:9c by local choice (Reason: 3=DEAUTH_LEAVING) WARNING: CPU: 1 PID: 19032 at net/mac80211/ieee80211_i.h:1013 sta_info_alloc+0x374/0x3fc [mac80211] [<bf77272c>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211])) [<bf73cc50>] (nl80211_new_station [cfg80211]) Unable to handle kernel NULL pointer dereference at virtual address 00000014 pgd = d5f4c000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM PC is at sta_info_alloc+0x380/0x3fc [mac80211] LR is at sta_info_alloc+0x37c/0x3fc [mac80211] [<bf772738>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211]) [<bf73cc50>] (nl80211_new_station [cfg80211])) Cc: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-04-27 15:15:38 +08:00
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);
}
}
/**
* 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);
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);
mac80211: mesh power save basics Add routines to - maintain a PS mode for each peer and a non-peer PS mode - indicate own PS mode in transmitted frames - track neighbor STAs power modes - buffer frames when neighbors are in PS mode - add TIM and Awake Window IE to beacons - release frames in Mesh Peer Service Periods Add local_pm to sta_info to represent the link-specific power mode at this station towards the remote station. When a peer link is established, use the default power mode stored in mesh config. Update the PS status if the peering status of a neighbor changes. Maintain a mesh power mode for non-peer mesh STAs. Set the non-peer power mode to active mode during peering. Authenticated mesh peering is currently not working when either node is configured to be in power save mode. Indicate the current power mode in transmitted frames. Use QoS Nulls to indicate mesh power mode transitions. For performance reasons, calls to the function setting the frame flags are placed in HWMP routing routines, as there the STA pointer is already available. Add peer_pm to sta_info to represent the peer's link-specific power mode towards the local station. Add nonpeer_pm to represent the peer's power mode towards all non-peer stations. Track power modes based on received frames. Add the ps_data structure to ieee80211_if_mesh (for TIM map, PS neighbor counter and group-addressed frame buffer). Set WLAN_STA_PS flag for STA in PS mode to use the unicast frame buffering routines in the tx path. Update num_sta_ps to buffer and release group-addressed frames after DTIM beacons. Announce the awake window duration in beacons if in light or deep sleep mode towards any peer or non-peer. Create a TIM IE similarly to AP mode and add it to mesh beacons. Parse received Awake Window IEs and check TIM IEs for buffered frames. Release frames towards peers in mesh Peer Service Periods. Use the corresponding trigger frames and monitor the MPSP status. Append a QoS Null as trigger frame if neccessary to properly end the MPSP. Currently, in HT channels MPSPs behave imperfectly and show large delay spikes and frame losses. Signed-off-by: Marco Porsch <marco@cozybit.com> Signed-off-by: Ivan Bezyazychnyy <ivan.bezyazychnyy@gmail.com> Signed-off-by: Mike Krinkin <krinkin.m.u@gmail.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-01-31 01:14:08 +08:00
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);
mac80211: mesh power save basics Add routines to - maintain a PS mode for each peer and a non-peer PS mode - indicate own PS mode in transmitted frames - track neighbor STAs power modes - buffer frames when neighbors are in PS mode - add TIM and Awake Window IE to beacons - release frames in Mesh Peer Service Periods Add local_pm to sta_info to represent the link-specific power mode at this station towards the remote station. When a peer link is established, use the default power mode stored in mesh config. Update the PS status if the peering status of a neighbor changes. Maintain a mesh power mode for non-peer mesh STAs. Set the non-peer power mode to active mode during peering. Authenticated mesh peering is currently not working when either node is configured to be in power save mode. Indicate the current power mode in transmitted frames. Use QoS Nulls to indicate mesh power mode transitions. For performance reasons, calls to the function setting the frame flags are placed in HWMP routing routines, as there the STA pointer is already available. Add peer_pm to sta_info to represent the peer's link-specific power mode towards the local station. Add nonpeer_pm to represent the peer's power mode towards all non-peer stations. Track power modes based on received frames. Add the ps_data structure to ieee80211_if_mesh (for TIM map, PS neighbor counter and group-addressed frame buffer). Set WLAN_STA_PS flag for STA in PS mode to use the unicast frame buffering routines in the tx path. Update num_sta_ps to buffer and release group-addressed frames after DTIM beacons. Announce the awake window duration in beacons if in light or deep sleep mode towards any peer or non-peer. Create a TIM IE similarly to AP mode and add it to mesh beacons. Parse received Awake Window IEs and check TIM IEs for buffered frames. Release frames towards peers in mesh Peer Service Periods. Use the corresponding trigger frames and monitor the MPSP status. Append a QoS Null as trigger frame if neccessary to properly end the MPSP. Currently, in HT channels MPSPs behave imperfectly and show large delay spikes and frame losses. Signed-off-by: Marco Porsch <marco@cozybit.com> Signed-off-by: Ivan Bezyazychnyy <ivan.bezyazychnyy@gmail.com> Signed-off-by: Mike Krinkin <krinkin.m.u@gmail.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-01-31 01:14:08 +08:00
/* 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;
mac80211: Fix possible sband related NULL pointer de-reference Existing API 'ieee80211_get_sdata_band' returns default 2 GHz band even if the channel context configuration is NULL. This crashes for chipsets which support 5 Ghz alone when it tries to access members of 'sband'. Channel context configuration can be NULL in multivif case and when channel switch is in progress (or) when it fails. Fix this by replacing the API 'ieee80211_get_sdata_band' with 'ieee80211_get_sband' which returns a NULL pointer for sband when the channel configuration is NULL. An example scenario is as below: In multivif mode (AP + STA) with drivers like ath10k, when we do a channel switch in the AP vif (which has a number of clients connected) and a STA vif which is connected to some other AP, when the channel switch in AP vif fails, while the STA vifs tries to connect to the other AP, there is a window where the channel context is NULL/invalid and this results in a crash while the clients connected to the AP vif tries to reconnect and this race is very similar to the one investigated by Michal in https://patchwork.kernel.org/patch/3788161/ and this does happens with hardware that supports 5Ghz alone after long hours of testing with continuous channel switch on the AP vif ieee80211 phy0: channel context reservation cannot be finalized because some interfaces aren't switching wlan0: failed to finalize CSA, disconnecting wlan0-1: deauthenticating from 8c:fd:f0:01:54:9c by local choice (Reason: 3=DEAUTH_LEAVING) WARNING: CPU: 1 PID: 19032 at net/mac80211/ieee80211_i.h:1013 sta_info_alloc+0x374/0x3fc [mac80211] [<bf77272c>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211])) [<bf73cc50>] (nl80211_new_station [cfg80211]) Unable to handle kernel NULL pointer dereference at virtual address 00000014 pgd = d5f4c000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM PC is at sta_info_alloc+0x380/0x3fc [mac80211] LR is at sta_info_alloc+0x37c/0x3fc [mac80211] [<bf772738>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211]) [<bf73cc50>] (nl80211_new_station [cfg80211])) Cc: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-04-27 15:15:38 +08:00
struct ieee80211_supported_band *sband;
int err;
u32 sta_flags, vht_cap_info = 0;
sdata_assert_lock(sdata);
mac80211: Fix possible sband related NULL pointer de-reference Existing API 'ieee80211_get_sdata_band' returns default 2 GHz band even if the channel context configuration is NULL. This crashes for chipsets which support 5 Ghz alone when it tries to access members of 'sband'. Channel context configuration can be NULL in multivif case and when channel switch is in progress (or) when it fails. Fix this by replacing the API 'ieee80211_get_sdata_band' with 'ieee80211_get_sband' which returns a NULL pointer for sband when the channel configuration is NULL. An example scenario is as below: In multivif mode (AP + STA) with drivers like ath10k, when we do a channel switch in the AP vif (which has a number of clients connected) and a STA vif which is connected to some other AP, when the channel switch in AP vif fails, while the STA vifs tries to connect to the other AP, there is a window where the channel context is NULL/invalid and this results in a crash while the clients connected to the AP vif tries to reconnect and this race is very similar to the one investigated by Michal in https://patchwork.kernel.org/patch/3788161/ and this does happens with hardware that supports 5Ghz alone after long hours of testing with continuous channel switch on the AP vif ieee80211 phy0: channel context reservation cannot be finalized because some interfaces aren't switching wlan0: failed to finalize CSA, disconnecting wlan0-1: deauthenticating from 8c:fd:f0:01:54:9c by local choice (Reason: 3=DEAUTH_LEAVING) WARNING: CPU: 1 PID: 19032 at net/mac80211/ieee80211_i.h:1013 sta_info_alloc+0x374/0x3fc [mac80211] [<bf77272c>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211])) [<bf73cc50>] (nl80211_new_station [cfg80211]) Unable to handle kernel NULL pointer dereference at virtual address 00000014 pgd = d5f4c000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM PC is at sta_info_alloc+0x380/0x3fc [mac80211] LR is at sta_info_alloc+0x37c/0x3fc [mac80211] [<bf772738>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211]) [<bf73cc50>] (nl80211_new_station [cfg80211])) Cc: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-04-27 15:15:38 +08:00
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(&params, 0, sizeof(params));
mac80211: Fix possible sband related NULL pointer de-reference Existing API 'ieee80211_get_sdata_band' returns default 2 GHz band even if the channel context configuration is NULL. This crashes for chipsets which support 5 Ghz alone when it tries to access members of 'sband'. Channel context configuration can be NULL in multivif case and when channel switch is in progress (or) when it fails. Fix this by replacing the API 'ieee80211_get_sdata_band' with 'ieee80211_get_sband' which returns a NULL pointer for sband when the channel configuration is NULL. An example scenario is as below: In multivif mode (AP + STA) with drivers like ath10k, when we do a channel switch in the AP vif (which has a number of clients connected) and a STA vif which is connected to some other AP, when the channel switch in AP vif fails, while the STA vifs tries to connect to the other AP, there is a window where the channel context is NULL/invalid and this results in a crash while the clients connected to the AP vif tries to reconnect and this race is very similar to the one investigated by Michal in https://patchwork.kernel.org/patch/3788161/ and this does happens with hardware that supports 5Ghz alone after long hours of testing with continuous channel switch on the AP vif ieee80211 phy0: channel context reservation cannot be finalized because some interfaces aren't switching wlan0: failed to finalize CSA, disconnecting wlan0-1: deauthenticating from 8c:fd:f0:01:54:9c by local choice (Reason: 3=DEAUTH_LEAVING) WARNING: CPU: 1 PID: 19032 at net/mac80211/ieee80211_i.h:1013 sta_info_alloc+0x374/0x3fc [mac80211] [<bf77272c>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211])) [<bf73cc50>] (nl80211_new_station [cfg80211]) Unable to handle kernel NULL pointer dereference at virtual address 00000014 pgd = d5f4c000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM PC is at sta_info_alloc+0x380/0x3fc [mac80211] LR is at sta_info_alloc+0x37c/0x3fc [mac80211] [<bf772738>] (sta_info_alloc [mac80211]) [<bf78776c>] (ieee80211_add_station [mac80211]) [<bf73cc50>] (nl80211_new_station [cfg80211])) Cc: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-04-27 15:15:38 +08:00
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, &params.chandef,
IEEE80211_CHAN_DISABLED) ||
!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.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,
&params.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(&params.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,
&params) < 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);
mac80211: mesh power save basics Add routines to - maintain a PS mode for each peer and a non-peer PS mode - indicate own PS mode in transmitted frames - track neighbor STAs power modes - buffer frames when neighbors are in PS mode - add TIM and Awake Window IE to beacons - release frames in Mesh Peer Service Periods Add local_pm to sta_info to represent the link-specific power mode at this station towards the remote station. When a peer link is established, use the default power mode stored in mesh config. Update the PS status if the peering status of a neighbor changes. Maintain a mesh power mode for non-peer mesh STAs. Set the non-peer power mode to active mode during peering. Authenticated mesh peering is currently not working when either node is configured to be in power save mode. Indicate the current power mode in transmitted frames. Use QoS Nulls to indicate mesh power mode transitions. For performance reasons, calls to the function setting the frame flags are placed in HWMP routing routines, as there the STA pointer is already available. Add peer_pm to sta_info to represent the peer's link-specific power mode towards the local station. Add nonpeer_pm to represent the peer's power mode towards all non-peer stations. Track power modes based on received frames. Add the ps_data structure to ieee80211_if_mesh (for TIM map, PS neighbor counter and group-addressed frame buffer). Set WLAN_STA_PS flag for STA in PS mode to use the unicast frame buffering routines in the tx path. Update num_sta_ps to buffer and release group-addressed frames after DTIM beacons. Announce the awake window duration in beacons if in light or deep sleep mode towards any peer or non-peer. Create a TIM IE similarly to AP mode and add it to mesh beacons. Parse received Awake Window IEs and check TIM IEs for buffered frames. Release frames towards peers in mesh Peer Service Periods. Use the corresponding trigger frames and monitor the MPSP status. Append a QoS Null as trigger frame if neccessary to properly end the MPSP. Currently, in HT channels MPSPs behave imperfectly and show large delay spikes and frame losses. Signed-off-by: Marco Porsch <marco@cozybit.com> Signed-off-by: Ivan Bezyazychnyy <ivan.bezyazychnyy@gmail.com> Signed-off-by: Mike Krinkin <krinkin.m.u@gmail.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-01-31 01:14:08 +08:00
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;
}
mac80211: mesh: fix cleanup for mesh pathtable The mesh path table needs to be around for the entire time the interface is in mesh mode, as users can perform an mpath dump at any time. The existing path table lifetime is instead tied to the mesh BSS which can cause crashes when different MBSSes are joined in the context of a single interface, or when the path table is dumped when no MBSS is joined. Introduce a new function to perform the final teardown of the interface and perform path table cleanup there. We already free the individual path elements when the leaving the mesh so no additional cleanup is needed there. This fixes the following crash: [ 47.753026] BUG: unable to handle kernel paging request at fffffff0 [ 47.753026] IP: [<c0239765>] kthread_data+0xa/0xe [ 47.753026] *pde = 00741067 *pte = 00000000 [ 47.753026] Oops: 0000 [#4] PREEMPT [ 47.753026] Modules linked in: ppp_generic slhc 8021q garp mrp sch_fq_codel iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat ip_tables ath9k_htc ath5k 8139too ath10k_pci ath10k_core arc4 ath9k ath9k_common ath9k_hw mac80211 ath cfg80211 cpufreq_powersave br_netfilter bridge stp llc ipw usb_wwan sierra_net usbnet af_alg natsemi via_rhine mii iTCO_wdt iTCO_vendor_support gpio_ich sierra coretemp pcspkr i2c_i801 lpc_ich ata_generic ata_piix libata ide_pci_generic piix e1000e igb i2c_algo_bit ptp pps_core [last unloaded: 8139too] [ 47.753026] CPU: 0 PID: 12 Comm: kworker/u2:1 Tainted: G D W 4.5.0-wt-V3 #6 [ 47.753026] Hardware name: To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080016 11/07/2014 [ 47.753026] task: f645a0c0 ti: f6462000 task.ti: f6462000 [ 47.753026] EIP: 0060:[<c0239765>] EFLAGS: 00010002 CPU: 0 [ 47.753026] EIP is at kthread_data+0xa/0xe [ 47.753026] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 [ 47.753026] ESI: f645a0c0 EDI: f645a2fc EBP: f6463a80 ESP: f6463a78 [ 47.753026] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 [ 47.753026] CR0: 8005003b CR2: 00000014 CR3: 353e5000 CR4: 00000690 [ 47.753026] Stack: [ 47.753026] c0236866 00000000 f6463aac c05768b4 00000009 f6463ba8 f6463ab0 c0247010 [ 47.753026] 00000000 f645a0c0 f6464000 00000009 f6463ba8 f6463ab8 c0576eb2 f645a0c0 [ 47.753026] f6463aec c0228be4 c06335a4 f6463adc f6463ad0 c06c06d4 f6463ae4 c02471b0 [ 47.753026] Call Trace: [ 47.753026] [<c0236866>] ? wq_worker_sleeping+0xb/0x78 [ 47.753026] [<c05768b4>] __schedule+0xda/0x587 [ 47.753026] [<c0247010>] ? vprintk_default+0x12/0x14 [ 47.753026] [<c0576eb2>] schedule+0x72/0x89 [ 47.753026] [<c0228be4>] do_exit+0xb8/0x71d [ 47.753026] [<c02471b0>] ? kmsg_dump+0xa9/0xae [ 47.753026] [<c0203576>] oops_end+0x69/0x70 [ 47.753026] [<c021dcdb>] no_context+0x1bb/0x1c5 [ 47.753026] [<c021de1b>] __bad_area_nosemaphore+0x136/0x140 [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c021de32>] bad_area_nosemaphore+0xd/0x10 [ 47.753026] [<c021e0a1>] __do_page_fault+0x26c/0x320 [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c021e2fa>] do_page_fault+0xb/0xd [ 47.753026] [<c05798f8>] error_code+0x58/0x60 [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c0239765>] ? kthread_data+0xa/0xe [ 47.753026] [<c0236866>] ? wq_worker_sleeping+0xb/0x78 [ 47.753026] [<c05768b4>] __schedule+0xda/0x587 [ 47.753026] [<c0247010>] ? vprintk_default+0x12/0x14 [ 47.753026] [<c0576eb2>] schedule+0x72/0x89 [ 47.753026] [<c0228be4>] do_exit+0xb8/0x71d [ 47.753026] [<c02471b0>] ? kmsg_dump+0xa9/0xae [ 47.753026] [<c0203576>] oops_end+0x69/0x70 [ 47.753026] [<c021dcdb>] no_context+0x1bb/0x1c5 [ 47.753026] [<c021de1b>] __bad_area_nosemaphore+0x136/0x140 [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c021de32>] bad_area_nosemaphore+0xd/0x10 [ 47.753026] [<c021e0a1>] __do_page_fault+0x26c/0x320 [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c021e2fa>] do_page_fault+0xb/0xd [ 47.753026] [<c05798f8>] error_code+0x58/0x60 [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c0239765>] ? kthread_data+0xa/0xe [ 47.753026] [<c0236866>] ? wq_worker_sleeping+0xb/0x78 [ 47.753026] [<c05768b4>] __schedule+0xda/0x587 [ 47.753026] [<c0391e32>] ? put_io_context_active+0x6d/0x95 [ 47.753026] [<c0576eb2>] schedule+0x72/0x89 [ 47.753026] [<c02291f8>] do_exit+0x6cc/0x71d [ 47.753026] [<c0203576>] oops_end+0x69/0x70 [ 47.753026] [<c021dcdb>] no_context+0x1bb/0x1c5 [ 47.753026] [<c021de1b>] __bad_area_nosemaphore+0x136/0x140 [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c021de32>] bad_area_nosemaphore+0xd/0x10 [ 47.753026] [<c021e0a1>] __do_page_fault+0x26c/0x320 [ 47.753026] [<c03b9160>] ? debug_smp_processor_id+0x12/0x16 [ 47.753026] [<c02015e2>] ? __switch_to+0x24/0x40e [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c021e2fa>] do_page_fault+0xb/0xd [ 47.753026] [<c05798f8>] error_code+0x58/0x60 [ 47.753026] [<c021e2ef>] ? vmalloc_sync_all+0x19a/0x19a [ 47.753026] [<c03b59d2>] ? rhashtable_walk_init+0x5c/0x93 [ 47.753026] [<f9843221>] mesh_path_tbl_expire.isra.24+0x19/0x82 [mac80211] [ 47.753026] [<f984408b>] mesh_path_expire+0x11/0x1f [mac80211] [ 47.753026] [<f9842bb7>] ieee80211_mesh_work+0x73/0x1a9 [mac80211] [ 47.753026] [<f98207d1>] ieee80211_iface_work+0x2ff/0x311 [mac80211] [ 47.753026] [<c0235fa3>] process_one_work+0x14b/0x24e [ 47.753026] [<c0236313>] worker_thread+0x249/0x343 [ 47.753026] [<c02360ca>] ? process_scheduled_works+0x24/0x24 [ 47.753026] [<c0239359>] kthread+0x9e/0xa3 [ 47.753026] [<c0578e50>] ret_from_kernel_thread+0x20/0x40 [ 47.753026] [<c02392bb>] ? kthread_parkme+0x18/0x18 [ 47.753026] Code: 6b c0 85 c0 75 05 e8 fb 74 fc ff 89 f8 84 c0 75 08 8d 45 e8 e8 34 dd 33 00 83 c4 28 5b 5e 5f 5d c3 55 8b 80 10 02 00 00 89 e5 5d <8b> 40 f0 c3 55 b9 04 00 00 00 89 e5 52 8b 90 10 02 00 00 8d 45 [ 47.753026] EIP: [<c0239765>] kthread_data+0xa/0xe SS:ESP 0068:f6463a78 [ 47.753026] CR2: 00000000fffffff0 [ 47.753026] ---[ end trace 867ca0bdd0767790 ]--- Fixes: 3b302ada7f0a ("mac80211: mesh: move path tables into if_mesh") Reported-by: Fred Veldini <fred.veldini@gmail.com> Signed-off-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2016-03-26 23:27:18 +08:00
void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
{
mesh_rmc_free(sdata);
mesh_pathtbl_unregister(sdata);
}