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common: Support parsing link specific association request

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An association request in the context of an MLO connection can
contain an ML element that holds the per station profile for
the additional links negotiated. To support this, add a function
to parse the per station profile.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
This commit is contained in:
Ilan Peer 2023-02-16 01:08:29 +02:00 committed by Jouni Malinen
parent b39e356931
commit 7a7a2256c0
2 changed files with 151 additions and 0 deletions
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147
src/common/ieee802_11_common.c
View file

@ -944,6 +944,153 @@ void ieee802_11_elems_clear_ext_ids(struct ieee802_11_elems *elems,
}
ParseRes ieee802_11_parse_link_assoc_req(const u8 *start, size_t len,
struct ieee802_11_elems *elems,
struct wpabuf *mlbuf,
u8 link_id, bool show_errors)
{
const struct ieee80211_eht_ml *ml;
const u8 *pos;
ParseRes res = ParseFailed;
pos = wpabuf_head(mlbuf);
len = wpabuf_len(mlbuf);
/* Must have control and common info length */
if (len < sizeof(*ml) + 1 || len < sizeof(*ml) + pos[sizeof(*ml)])
goto out;
ml = (const struct ieee80211_eht_ml *) pos;
/* As we are interested with the Per-STA profile, ignore other types */
if ((le_to_host16(ml->ml_control) & MULTI_LINK_CONTROL_TYPE_MASK) !=
MULTI_LINK_CONTROL_TYPE_BASIC)
goto out;
/* Skip the common info */
len -= sizeof(*ml) + pos[sizeof(*ml)];
pos += sizeof(*ml) + pos[sizeof(*ml)];
while (len > 2) {
size_t sub_elem_len = *(pos + 1);
size_t sta_info_len;
u16 link_info_control;
const u8 *non_inherit;
wpa_printf(MSG_DEBUG,
"MLD: sub element: len=%zu, sub_elem_len=%zu",
len, sub_elem_len);
if (2 + sub_elem_len > len) {
if (show_errors)
wpa_printf(MSG_DEBUG,
"MLD: error: len=%zu, sub_elem_len=%zu",
len, sub_elem_len);
goto out;
}
if (*pos != 0) {
pos += 2 + sub_elem_len;
len -= 2 + sub_elem_len;
continue;
}
if (sub_elem_len < 3) {
if (show_errors)
wpa_printf(MSG_DEBUG,
"MLD: error: sub_elem_len=%zu < 5",
sub_elem_len);
goto out;
}
link_info_control = WPA_GET_LE16(pos + 2);
if ((link_info_control & BASIC_MLE_STA_CTRL_LINK_ID_MASK) !=
link_id) {
pos += 2 + sub_elem_len;
len -= 2 + sub_elem_len;
continue;
}
sta_info_len = *(pos + 4);
if (sub_elem_len < sta_info_len + 3 || sta_info_len < 1) {
if (show_errors)
wpa_printf(MSG_DEBUG,
"MLD: error: sub_elem_len=%zu, sta_info_len=%zu",
sub_elem_len, sta_info_len);
goto out;
}
pos += sta_info_len + 4;
sub_elem_len -= sta_info_len + 2;
if (sub_elem_len < 2) {
if (show_errors)
wpa_printf(MSG_DEBUG,
"MLD: missing capability info");
goto out;
}
pos += 2;
sub_elem_len -= 2;
/* Handle non-inheritance */
non_inherit = get_ie_ext(pos, sub_elem_len,
WLAN_EID_EXT_NON_INHERITANCE);
if (non_inherit && non_inherit[1] > 1) {
u8 non_inherit_len = non_inherit[1] - 1;
/*
* Do not include the Non-Inheritance element when
* parsing below. It should be the last element in the
* subelement.
*/
if (3U + non_inherit_len > sub_elem_len)
goto out;
sub_elem_len -= 3 + non_inherit_len;
/* Skip the ID, length and extension ID */
non_inherit += 3;
if (non_inherit_len < 1UL + non_inherit[0]) {
if (show_errors)
wpa_printf(MSG_DEBUG,
"MLD: Invalid inheritance");
goto out;
}
ieee802_11_elems_clear_ids(elems, &non_inherit[1],
non_inherit[0]);
non_inherit_len -= 1 + non_inherit[0];
non_inherit += 1 + non_inherit[0];
if (non_inherit_len < 1UL + non_inherit[0]) {
if (show_errors)
wpa_printf(MSG_DEBUG,
"MLD: Invalid inheritance");
goto out;
}
ieee802_11_elems_clear_ext_ids(elems, &non_inherit[1],
non_inherit[0]);
}
wpa_printf(MSG_DEBUG, "MLD: link: sub_elem_len=%zu",
sub_elem_len);
if (sub_elem_len)
res = __ieee802_11_parse_elems(pos, sub_elem_len,
elems, show_errors);
else
res = ParseOK;
break;
}
out:
return res;
}
int ieee802_11_ie_count(const u8 *ies, size_t ies_len)
{
const struct element *elem;

4
src/common/ieee802_11_common.h
View file

@ -190,6 +190,10 @@ void ieee802_11_elems_clear_ids(struct ieee802_11_elems *elems,
const u8 *ids, size_t num);
void ieee802_11_elems_clear_ext_ids(struct ieee802_11_elems *elems,
const u8 *ids, size_t num);
ParseRes ieee802_11_parse_link_assoc_req(const u8 *start, size_t len,
struct ieee802_11_elems *elems,
struct wpabuf *mlbuf,
u8 link_id, bool show_errors);
int ieee802_11_ie_count(const u8 *ies, size_t ies_len);
struct wpabuf * ieee802_11_vendor_ie_concat(const u8 *ies, size_t ies_len,
u32 oui_type);