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wifi: mac80211: fix multi-BSSID element parsing

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When parsing a frame containing a multi-BSSID element, we
need to know both the transmitted and non-transmitted BSSID
so we can parse it correctly.

Unfortunately, in quite a number of cases, we got this wrong
and were passing the wrong BSSID or useless information:
 * the mgmt->bssid from a frame is only the transmitted
   BSSID if the frame is a beacon
 * passing just one of the parameters as non-NULL isn't
   useful and ignored

In those case where we need to parse for a specific BSS we
always have a BSS structure pointer, representing the BSS
we need, whether transmitted or not. Thus, pass that pointer
to the parsing function instead of the two BSSIDs.

Also fix two bugs:
 * we need to re-parse all the elements for the other BSS
   when iterating the non-transmitted BSSes in scan
 * we need to parse for the correct BSS when setting up
   the channel data in client code

Fixes: 78ac51f815 ("mac80211: support multi-bssid")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2022-06-29 13:29:05 +02:00
parent ab3a830d96
commit 38c6aa29d4
10 changed files with 38 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/mac80211/agg-rx.c
View File

@ -502,7 +502,7 @@ void ieee80211_process_addba_request(struct ieee80211_local *local,
u.action.u.addba_req.variable);
if (ies_len) {
elems = ieee802_11_parse_elems(mgmt->u.action.u.addba_req.variable,
ies_len, true, mgmt->bssid, NULL);
ies_len, true, NULL);
if (!elems || elems->parse_error)
goto free;
}

5
net/mac80211/ibss.c
View File

@ -1601,8 +1601,7 @@ void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
return;
elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
len - baselen, false,
mgmt->bssid, NULL);
len - baselen, false, NULL);
if (elems) {
ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems);
@ -1655,7 +1654,7 @@ void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
elems = ieee802_11_parse_elems(
mgmt->u.action.u.chan_switch.variable,
ies_len, true, mgmt->bssid, NULL);
ies_len, true, NULL);
if (elems && !elems->parse_error)
ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt,

22
net/mac80211/ieee80211_i.h
View File

@ -2147,10 +2147,9 @@ static inline void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata,
* @filter: bitmap of element IDs to filter out while calculating
* the element CRC
* @crc: CRC starting value
* @transmitter_bssid: transmitter BSSID to parse the multi-BSSID
* element
* @bss_bssid: BSSID of the BSS we want to obtain elements for
* when parsing the multi-BSSID element
* @bss: the BSS to parse this as, for multi-BSSID cases this can
* represent a non-transmitting BSS in which case the data
* for that non-transmitting BSS is returned
*/
struct ieee80211_elems_parse_params {
const u8 *start;
@ -2158,8 +2157,7 @@ struct ieee80211_elems_parse_params {
bool action;
u64 filter;
u32 crc;
const u8 *transmitter_bssid;
const u8 *bss_bssid;
struct cfg80211_bss *bss;
};
struct ieee802_11_elems *
@ -2168,8 +2166,7 @@ ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params);
static inline struct ieee802_11_elems *
ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
u64 filter, u32 crc,
const u8 *transmitter_bssid,
const u8 *bss_bssid)
struct cfg80211_bss *bss)
{
struct ieee80211_elems_parse_params params = {
.start = start,
@ -2177,8 +2174,7 @@ ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
.action = action,
.filter = filter,
.crc = crc,
.transmitter_bssid = transmitter_bssid,
.bss_bssid = bss_bssid,
.bss = bss,
};
return ieee802_11_parse_elems_full(&params);
@ -2186,11 +2182,9 @@ ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
static inline struct ieee802_11_elems *
ieee802_11_parse_elems(const u8 *start, size_t len, bool action,
const u8 *transmitter_bssid,
const u8 *bss_bssid)
struct cfg80211_bss *bss)
{
return ieee802_11_parse_elems_crc(start, len, action, 0, 0,
transmitter_bssid, bss_bssid);
return ieee802_11_parse_elems_crc(start, len, action, 0, 0, bss);
}

8
net/mac80211/mesh.c
View File

@ -1256,8 +1256,7 @@ ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
if (baselen > len)
return;
elems = ieee802_11_parse_elems(pos, len - baselen, false, mgmt->bssid,
NULL);
elems = ieee802_11_parse_elems(pos, len - baselen, false, NULL);
if (!elems)
return;
@ -1326,7 +1325,7 @@ static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
len - baselen,
false, mgmt->bssid, NULL);
false, NULL);
if (!elems)
return;
@ -1468,8 +1467,7 @@ static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
pos = mgmt->u.action.u.chan_switch.variable;
baselen = offsetof(struct ieee80211_mgmt,
u.action.u.chan_switch.variable);
elems = ieee802_11_parse_elems(pos, len - baselen, true,
mgmt->bssid, NULL);
elems = ieee802_11_parse_elems(pos, len - baselen, true, NULL);
if (!elems)
return;

2
net/mac80211/mesh_hwmp.c
View File

@ -932,7 +932,7 @@ void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
elems = ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
len - baselen, false, mgmt->bssid, NULL);
len - baselen, false, NULL);
if (!elems)
return;

3
net/mac80211/mesh_plink.c
View File

@ -1229,8 +1229,7 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
if (baselen > len)
return;
}
elems = ieee802_11_parse_elems(baseaddr, len - baselen, true,
mgmt->bssid, NULL);
elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
kfree(elems);
}

17
net/mac80211/mlme.c
View File

@ -3536,8 +3536,7 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
}
bss_elems = ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
false, mgmt->bssid,
assoc_data->bss->bssid);
false, assoc_data->bss);
if (!bss_elems) {
ret = false;
goto out;
@ -3927,7 +3926,7 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
return;
elems = ieee802_11_parse_elems(pos, len - (pos - (u8 *)mgmt), false,
mgmt->bssid, assoc_data->bss->bssid);
assoc_data->bss);
if (!elems)
goto notify_driver;
@ -4252,8 +4251,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
ieee80211_rx_our_beacon(bssid, ifmgd->assoc_data->bss)) {
elems = ieee802_11_parse_elems(variable, len - baselen, false,
bssid,
ifmgd->assoc_data->bss->bssid);
ifmgd->assoc_data->bss);
if (!elems)
return;
@ -4321,7 +4319,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
elems = ieee802_11_parse_elems_crc(variable, len - baselen,
false, care_about_ies, ncrc,
mgmt->bssid, bssid);
link->u.mgd.bss);
if (!elems)
return;
ncrc = elems->crc;
@ -4566,7 +4564,7 @@ void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
/* CSA IE cannot be overridden, no need for BSSID */
elems = ieee802_11_parse_elems(
mgmt->u.action.u.chan_switch.variable,
ies_len, true, mgmt->bssid, NULL);
ies_len, true, NULL);
if (elems && !elems->parse_error)
ieee80211_sta_process_chanswitch(link,
@ -4590,7 +4588,7 @@ void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
*/
elems = ieee802_11_parse_elems(
mgmt->u.action.u.ext_chan_switch.variable,
ies_len, true, mgmt->bssid, NULL);
ies_len, true, NULL);
if (elems && !elems->parse_error) {
/* for the handling code pretend it was an IE */
@ -5445,8 +5443,7 @@ static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
rcu_read_lock();
ies = rcu_dereference(cbss->ies);
elems = ieee802_11_parse_elems(ies->data, ies->len, false,
NULL, NULL);
elems = ieee802_11_parse_elems(ies->data, ies->len, false, cbss);
if (!elems) {
rcu_read_unlock();
return -ENOMEM;

12
net/mac80211/scan.c
View File

@ -209,8 +209,7 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
if (baselen > len)
return NULL;
elems = ieee802_11_parse_elems(elements, len - baselen, false,
mgmt->bssid, cbss->bssid);
elems = ieee802_11_parse_elems(elements, len - baselen, false, cbss);
if (!elems)
return NULL;
@ -221,16 +220,21 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
bss = (void *)cbss->priv;
ieee80211_update_bss_from_elems(local, bss, elems, rx_status, beacon);
kfree(elems);
list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) {
non_tx_bss = (void *)non_tx_cbss->priv;
elems = ieee802_11_parse_elems(elements, len - baselen, false,
non_tx_cbss);
if (!elems)
continue;
ieee80211_update_bss_from_elems(local, non_tx_bss, elems,
rx_status, beacon);
kfree(elems);
}
kfree(elems);
return bss;
}

4
net/mac80211/tdls.c
View File

@ -1720,7 +1720,7 @@ ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
}
elems = ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
skb->len - baselen, false, NULL, NULL);
skb->len - baselen, false, NULL);
if (!elems) {
ret = -ENOMEM;
goto out;
@ -1838,7 +1838,7 @@ ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
}
elems = ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
skb->len - baselen, false, NULL, NULL);
skb->len - baselen, false, NULL);
if (!elems)
return -ENOMEM;

13
net/mac80211/util.c
View File

@ -1425,15 +1425,14 @@ _ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params,
static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len,
struct ieee802_11_elems *elems,
const u8 *transmitter_bssid,
const u8 *bss_bssid,
struct cfg80211_bss *bss,
u8 *nontransmitted_profile)
{
const struct element *elem, *sub;
size_t profile_len = 0;
bool found = false;
if (!bss_bssid || !transmitter_bssid)
if (!bss || !bss->transmitted_bss)
return profile_len;
for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) {
@ -1475,11 +1474,11 @@ static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len,
continue;
}
cfg80211_gen_new_bssid(transmitter_bssid,
cfg80211_gen_new_bssid(bss->transmitted_bss->bssid,
elem->data[0],
index[2],
new_bssid);
if (ether_addr_equal(new_bssid, bss_bssid)) {
if (ether_addr_equal(new_bssid, bss->bssid)) {
found = true;
elems->bssid_index_len = index[1];
elems->bssid_index = (void *)&index[2];
@ -1509,9 +1508,7 @@ ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params)
if (nontransmitted_profile) {
nontransmitted_profile_len =
ieee802_11_find_bssid_profile(params->start, params->len,
elems,
params->transmitter_bssid,
params->bss_bssid,
elems, params->bss,
nontransmitted_profile);
non_inherit =
cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,