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mac80211: support profile split between elements 

Since an element is limited to 255 octets, a profile may be split
split to several elements. Support the split as defined in the 11ax
draft 3.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Sara Sharon 2019-03-15 17:39:06 +02:00 committed by Johannes Berg
parent fe806e4992
commit 5023b14cf4
2 changed files with 37 additions and 20 deletions
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1
net/mac80211/ieee80211_i.h
View File

@ -1505,7 +1505,6 @@ struct ieee802_11_elems {
const struct ieee80211_bss_max_idle_period_ie *max_idle_period_ie;
const struct ieee80211_multiple_bssid_configuration *mbssid_config_ie;
const struct ieee80211_bssid_index *bssid_index;
const u8 *nontransmitted_bssid_profile;
u8 max_bssid_indicator;
u8 dtim_count;
u8 dtim_period;

56
net/mac80211/util.c
View File

@ -1254,15 +1254,18 @@ _ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
return crc;
}
static void ieee802_11_find_bssid_profile(const u8 *start, size_t len,
struct ieee802_11_elems *elems,
u8 *transmitter_bssid,
u8 *bss_bssid)
static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len,
struct ieee802_11_elems *elems,
u8 *transmitter_bssid,
u8 *bss_bssid,
u8 **nontransmitted_profile)
{
const struct element *elem, *sub;
size_t profile_len = 0;
bool found = false;
if (!bss_bssid || !transmitter_bssid)
return;
return profile_len;
for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) {
if (elem->datalen < 2)
@ -1287,9 +1290,17 @@ static void ieee802_11_find_bssid_profile(const u8 *start, size_t len,
continue;
}
memset(*nontransmitted_profile, 0, len);
profile_len = cfg80211_merge_profile(start, len,
elem,
sub,
nontransmitted_profile,
len);
/* found a Nontransmitted BSSID Profile */
index = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX,
sub->data, sub->datalen);
*nontransmitted_profile,
profile_len);
if (!index || index[1] < 1 || index[2] == 0) {
/* Invalid MBSSID Index element */
continue;
@ -1300,14 +1311,15 @@ static void ieee802_11_find_bssid_profile(const u8 *start, size_t len,
index[2],
new_bssid);
if (ether_addr_equal(new_bssid, bss_bssid)) {
elems->nontransmitted_bssid_profile =
elem->data;
found = true;
elems->bssid_index_len = index[1];
elems->bssid_index = (void *)&index[2];
break;
}
}
}
return found ? profile_len : 0;
}
u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
@ -1316,30 +1328,34 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
u8 *bss_bssid)
{
const struct element *non_inherit = NULL;
u8 *nontransmitted_profile;
int nontransmitted_profile_len = 0;
memset(elems, 0, sizeof(*elems));
elems->ie_start = start;
elems->total_len = len;
ieee802_11_find_bssid_profile(start, len, elems, transmitter_bssid,
bss_bssid);
if (elems->nontransmitted_bssid_profile)
nontransmitted_profile = kmalloc(len, GFP_ATOMIC);
if (nontransmitted_profile) {
nontransmitted_profile_len =
ieee802_11_find_bssid_profile(start, len, elems,
transmitter_bssid,
bss_bssid,
&nontransmitted_profile);
non_inherit =
cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
&elems->nontransmitted_bssid_profile[2],
elems->nontransmitted_bssid_profile[1]);
nontransmitted_profile,
nontransmitted_profile_len);
}
crc = _ieee802_11_parse_elems_crc(start, len, action, elems, filter,
crc, non_inherit);
/* Override with nontransmitted profile, if found */
if (transmitter_bssid && elems->nontransmitted_bssid_profile) {
const u8 *profile = elems->nontransmitted_bssid_profile;
_ieee802_11_parse_elems_crc(&profile[2], profile[1],
if (nontransmitted_profile_len)
_ieee802_11_parse_elems_crc(nontransmitted_profile,
nontransmitted_profile_len,
action, elems, 0, 0, NULL);
}
if (elems->tim && !elems->parse_error) {
const struct ieee80211_tim_ie *tim_ie = elems->tim;
@ -1359,6 +1375,8 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
offsetofend(struct ieee80211_bssid_index, dtim_count))
elems->dtim_count = elems->bssid_index->dtim_count;
kfree(nontransmitted_profile);
return crc;
}