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components/wpa_supplicant/src/common/ieee802_11_common.c
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/*
* IEEE 802.11 Common routines
* Copyright (c) 2002-2019, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "defs.h"
#include "ieee802_11_defs.h"
#include "ieee802_11_common.h"
#include "common/wpa_supplicant_i.h"
/**
* get_ie - Fetch a specified information element from IEs buffer
* @ies: Information elements buffer
* @len: Information elements buffer length
* @eid: Information element identifier (WLAN_EID_*)
* Returns: Pointer to the information element (id field) or %NULL if not found
*
* This function returns the first matching information element in the IEs
* buffer or %NULL in case the element is not found.
*/
const u8 * get_ie(const u8 *ies, size_t len, u8 eid)
{
const struct element *elem;
if (!ies)
return NULL;
for_each_element_id(elem, eid, ies, len)
return &elem->id;
return NULL;
}
int ieee802_11_ie_count(const u8 *ies, size_t ies_len)
{
const struct element *elem;
int count = 0;
if (ies == NULL)
return 0;
for_each_element(elem, ies, ies_len)
count++;
return count;
}
const u8 * get_vendor_ie(const u8 *ies, size_t len, u32 vendor_type)
{
const struct element *elem;
for_each_element_id(elem, WLAN_EID_VENDOR_SPECIFIC, ies, len) {
if (elem->datalen >= 4 &&
vendor_type == WPA_GET_BE32(elem->data))
return &elem->id;
}
return NULL;
}
size_t mbo_add_ie(u8 *buf, size_t len, const u8 *attr, size_t attr_len)
{
/*
* MBO IE requires 6 bytes without the attributes: EID (1), length (1),
* OUI (3), OUI type (1).
*/
if (len < 6 + attr_len) {
wpa_printf(MSG_DEBUG,
"MBO: Not enough room in buffer for MBO IE: buf len = %zu, attr_len = %zu",
len, attr_len);
return 0;
}
*buf++ = WLAN_EID_VENDOR_SPECIFIC;
*buf++ = attr_len + 4;
WPA_PUT_BE24(buf, OUI_WFA);
buf += 3;
*buf++ = MBO_OUI_TYPE;
os_memcpy(buf, attr, attr_len);
return 6 + attr_len;
}
int ieee802_11_parse_candidate_list(const char *pos, u8 *nei_rep,
size_t nei_rep_len)
{
u8 *nei_pos = nei_rep;
const char *end;
/*
* BSS Transition Candidate List Entries - Neighbor Report elements
* neighbor=<BSSID>,<BSSID Information>,<Operating Class>,
* <Channel Number>,<PHY Type>[,<hexdump of Optional Subelements>]
*/
while (pos) {
u8 *nei_start;
long int val;
char *endptr, *tmp;
pos = os_strstr(pos, " neighbor=");
if (!pos)
break;
if (nei_pos + 15 > nei_rep + nei_rep_len) {
wpa_printf(MSG_DEBUG,
"Not enough room for additional neighbor");
return -1;
}
pos += 10;
nei_start = nei_pos;
*nei_pos++ = WLAN_EID_NEIGHBOR_REPORT;
nei_pos++; /* length to be filled in */
if (hwaddr_aton2(pos, nei_pos) < 0) {
wpa_printf(MSG_DEBUG, "Invalid BSSID");
return -1;
}
nei_pos += ETH_ALEN;
pos += 17;
if (*pos != ',') {
wpa_printf(MSG_DEBUG, "Missing BSSID Information");
return -1;
}
pos++;
val = strtol(pos, &endptr, 0);
WPA_PUT_LE32(nei_pos, val);
nei_pos += 4;
if (*endptr != ',') {
wpa_printf(MSG_DEBUG, "Missing Operating Class");
return -1;
}
pos = endptr + 1;
*nei_pos++ = atoi(pos); /* Operating Class */
pos = os_strchr(pos, ',');
if (pos == NULL) {
wpa_printf(MSG_DEBUG, "Missing Channel Number");
return -1;
}
pos++;
*nei_pos++ = atoi(pos); /* Channel Number */
pos = os_strchr(pos, ',');
if (pos == NULL) {
wpa_printf(MSG_DEBUG, "Missing PHY Type");
return -1;
}
pos++;
*nei_pos++ = atoi(pos); /* PHY Type */
end = os_strchr(pos, ' ');
tmp = os_strchr(pos, ',');
if (tmp && (!end || tmp < end)) {
/* Optional Subelements (hexdump) */
size_t len;
pos = tmp + 1;
end = os_strchr(pos, ' ');
if (end)
len = end - pos;
else
len = os_strlen(pos);
if (nei_pos + len / 2 > nei_rep + nei_rep_len) {
wpa_printf(MSG_DEBUG,
"Not enough room for neighbor subelements");
return -1;
}
if (len & 0x01 ||
hexstr2bin(pos, nei_pos, len / 2) < 0) {
wpa_printf(MSG_DEBUG,
"Invalid neighbor subelement info");
return -1;
}
nei_pos += len / 2;
pos = end;
}
nei_start[1] = nei_pos - nei_start - 2;
}
return nei_pos - nei_rep;
}
#ifdef CONFIG_SAE_PK
static int ieee802_11_parse_vendor_specific(struct wpa_supplicant *wpa_s, const struct element *elem, const u8* pos)
{
u32 oui;
oui = WPA_GET_BE24(pos);
switch (oui) {
case OUI_WFA:
switch (pos[3]) {
case SAE_PK_OUI_TYPE:
wpa_s->sae_pk_elems.sae_pk_len = elem->datalen - 4;
wpa_s->sae_pk_elems.sae_pk = (u8*)os_zalloc(sizeof(u8)*(elem->datalen-4));
if (!wpa_s->sae_pk_elems.sae_pk) {
wpa_printf(MSG_EXCESSIVE, "Can not allocate memory for sae_pk");
return -1;
}
os_memcpy(wpa_s->sae_pk_elems.sae_pk, pos+4, elem->datalen-4);
break;
default:
wpa_printf(MSG_EXCESSIVE, "Unknown WFA "
"information element ignored "
"(type=%d len=%lu)",
pos[3], (unsigned long) elem->datalen);
return -1;
}
break;
default:
wpa_printf(MSG_EXCESSIVE, "unknown vendor specific "
"information element ignored (vendor OUI "
"%02x:%02x:%02x len=%lu)",
pos[0], pos[1], pos[2], (unsigned long) elem->datalen);
return -1;
}
return 0;
}
static int ieee802_11_parse_extension(struct wpa_supplicant *wpa_s, const struct element *elem, const u8* pos){
// do not consider extension_id element len in datalen
if (elem->datalen < 1) {
wpa_printf(MSG_DEBUG,
"short information element (Ext)");
return -1;
}
u8 ext_id;
ext_id = *pos++;
switch (ext_id) {
case WLAN_EID_EXT_FILS_KEY_CONFIRM:
wpa_s->sae_pk_elems.fils_key_confirm_len = elem->datalen - 1;
wpa_s->sae_pk_elems.fils_key_confirm = (u8*)os_zalloc(sizeof(u8)*(elem->datalen - 1));
os_memcpy(wpa_s->sae_pk_elems.fils_key_confirm, pos, elem->datalen - 1);
break;
case WLAN_EID_EXT_FILS_PUBLIC_KEY:
wpa_s->sae_pk_elems.fils_pk_len = elem->datalen - 1;
wpa_s->sae_pk_elems.fils_pk = (u8*)os_zalloc(sizeof(u8)*(elem->datalen - 1));
os_memcpy(wpa_s->sae_pk_elems.fils_pk, pos, elem->datalen - 1);
break;
default:
wpa_printf(MSG_EXCESSIVE,
"IEEE 802.11 element parsing ignored unknown element extension (ext_id=%u elen=%u)",
ext_id, (unsigned int) elem->datalen-1);
return -1;
}
return 0;
}
#endif /* CONFIG_SAE_PK */
/**
* ieee802_11_parse_elems - Parse information elements in management frames
* @start: Pointer to the start of IEs
* @len: Length of IE buffer in octets
* @elems: Data structure for parsed elements
* @show_errors: Whether to show parsing errors in debug log
* Returns: Parsing result
*/
int ieee802_11_parse_elems(struct wpa_supplicant *wpa_s, const u8 *start, size_t len)
{
#if defined(CONFIG_RRM) || defined(CONFIG_WNM) || defined(CONFIG_SAE_PK)
const struct element *elem;
u8 unknown = 0;
if (!start)
return 0;
for_each_element(elem, start, len) {
u8 id = elem->id;
const u8 *pos = elem->data;
switch (id) {
#ifdef CONFIG_RRM
case WLAN_EID_RRM_ENABLED_CAPABILITIES:
os_memcpy(wpa_s->rrm_ie, pos, 5);
wpa_s->rrm.rrm_used = true;
break;
#endif
#ifdef CONFIG_SAE_PK
case WLAN_EID_EXTENSION:
if(ieee802_11_parse_extension(wpa_s, elem, pos) != 0){
unknown++;
}
break;
case WLAN_EID_VENDOR_SPECIFIC:
if(ieee802_11_parse_vendor_specific(wpa_s, elem, pos) != 0){
unknown++;
}
break;
#endif /*CONFIG_SAE_PK*/
#ifdef CONFIG_WNM
case WLAN_EID_EXT_CAPAB:
/* extended caps can go beyond 8 octacts but we aren't using them now */
os_memcpy(wpa_s->extend_caps, pos, 5);
break;
#endif
default:
break;
}
}
if (unknown)
return -1;
#endif /* defined(CONFIG_RRM) || defined(CONFIG_WNM) || defined(CONFIG_SAE_PK) */
return 0;
}
struct wpabuf * ieee802_11_vendor_ie_concat(const u8 *ies, size_t ies_len,
u32 oui_type)
{
struct wpabuf *buf;
const struct element *elem, *found = NULL;
for_each_element_id(elem, WLAN_EID_VENDOR_SPECIFIC, ies, ies_len) {
if (elem->datalen >= 4 &&
WPA_GET_BE32(elem->data) == oui_type) {
found = elem;
break;
}
}
if (!found)
return NULL; /* No specified vendor IE found */
buf = wpabuf_alloc(ies_len);
if (buf == NULL)
return NULL;
/*
* There may be multiple vendor IEs in the message, so need to
* concatenate their data fields.
*/
for_each_element_id(elem, WLAN_EID_VENDOR_SPECIFIC, ies, ies_len) {
if (elem->datalen >= 4 && WPA_GET_BE32(elem->data) == oui_type)
wpabuf_put_data(buf, elem->data + 4, elem->datalen - 4);
}
return buf;
}
int ieee802_11_ext_capab(const u8 *ie, unsigned int capab)
{
if (!ie || ie[1] <= capab / 8)
return 0;
return !!(ie[2 + capab / 8] & BIT(capab % 8));
}
u8 get_operating_class(u8 chan, int sec_channel)
{
u8 op_class = 0;
if (chan >= 1 && chan < 14) {
if (sec_channel == 1)
op_class = 83;
else if (sec_channel == -1)
op_class = 84;
else
op_class = 81;
}
if (chan == 14)
op_class = 82;
#if CONFIG_SOC_WIFI_SUPPORT_5G
if (chan >= 36 && chan <= 48) {
if (sec_channel == 1)
op_class = 116;
else if (sec_channel == -1)
op_class = 117;
else
op_class = 115;
}
if (chan >= 52 && chan <= 64) {
if (sec_channel == 1)
op_class = 119;
else if (sec_channel == -1)
op_class = 120;
else
op_class = 118;
}
if (chan >= 149 && chan <= 177) {
if (sec_channel == 1)
op_class = 126;
else if (sec_channel == -1)
op_class = 127;
else
op_class = 125;
}
if (chan >= 100 && chan <= 144) {
if (sec_channel == 1)
op_class = 122;
else if (sec_channel == -1)
op_class = 123;
else
op_class = 121;
}
#endif
return op_class;
}
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