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Parsing of multi band element

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Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Anton Nayshtut 2015-01-21 15:30:48 +02:00 committed by Jouni Malinen
parent 717333f4e4
commit 659a1605d8
2 changed files with 88 additions and 0 deletions
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74
src/common/ieee802_11_common.c
View file

@ -339,6 +339,18 @@ ParseRes ieee802_11_parse_elems(const u8 *start, size_t len,
/* after mic everything is encrypted, so stop. */
left = elen;
break;
case WLAN_EID_MULTI_BAND:
if (elems->mb_ies.nof_ies >= MAX_NOF_MB_IES_SUPPORTED) {
wpa_printf(MSG_MSGDUMP,
"IEEE 802.11 element parse ignored MB IE (id=%d elen=%d)",
id, elen);
break;
}
elems->mb_ies.ies[elems->mb_ies.nof_ies].ie = pos;
elems->mb_ies.ies[elems->mb_ies.nof_ies].ie_len = elen;
elems->mb_ies.nof_ies++;
break;
default:
unknown++;
if (!show_errors)
@ -946,3 +958,65 @@ const char * fc2str(u16 fc)
return "WLAN_FC_TYPE_UNKNOWN";
#undef C2S
}
#define IE_HEADER_SIZE ((u8) (2 * sizeof(u8)))
#define IE_BUFFER_LENGTH(ie_len_val) ((ie_len_val) + IE_HEADER_SIZE)
int mb_ies_info_by_ies(struct mb_ies_info *info, const u8 *ies_buf,
size_t ies_len)
{
os_memset(info, 0, sizeof(*info));
while (ies_buf && ies_len >= IE_HEADER_SIZE &&
info->nof_ies < MAX_NOF_MB_IES_SUPPORTED) {
size_t len = IE_BUFFER_LENGTH(ies_buf[1]);
if (len > ies_len) {
wpa_hexdump(MSG_DEBUG, "Truncated IEs",
ies_buf, ies_len);
return -1;
}
if (ies_buf[0] == WLAN_EID_MULTI_BAND) {
wpa_printf(MSG_DEBUG, "MB IE of %zu bytes found", len);
info->ies[info->nof_ies].ie = ies_buf + IE_HEADER_SIZE;
info->ies[info->nof_ies].ie_len = ies_buf[1];
info->nof_ies++;
}
ies_len -= len;
ies_buf += len;
}
return 0;
}
struct wpabuf * mb_ies_by_info(struct mb_ies_info *info)
{
struct wpabuf *mb_ies = NULL;
WPA_ASSERT(info != NULL);
if (info->nof_ies) {
u8 i;
size_t mb_ies_size = 0;
for (i = 0; i < info->nof_ies; i++)
mb_ies_size += IE_BUFFER_LENGTH(info->ies[i].ie_len);
mb_ies = wpabuf_alloc(mb_ies_size);
if (mb_ies) {
for (i = 0; i < info->nof_ies; i++) {
wpabuf_put_u8(mb_ies, WLAN_EID_MULTI_BAND);
wpabuf_put_u8(mb_ies, info->ies[i].ie_len);
wpabuf_put_data(mb_ies,
info->ies[i].ie,
info->ies[i].ie_len);
}
}
}
return mb_ies;
}

14
src/common/ieee802_11_common.h
View file

@ -9,6 +9,16 @@
#ifndef IEEE802_11_COMMON_H
#define IEEE802_11_COMMON_H
#define MAX_NOF_MB_IES_SUPPORTED 5
struct mb_ies_info {
struct {
const u8 *ie;
u8 ie_len;
} ies[MAX_NOF_MB_IES_SUPPORTED];
u8 nof_ies;
};
/* Parsed Information Elements */
struct ieee802_11_elems {
const u8 *ssid;
@ -76,6 +86,7 @@ struct ieee802_11_elems {
u8 osen_len;
u8 ampe_len;
u8 mic_len;
struct mb_ies_info mb_ies;
};
typedef enum { ParseOK = 0, ParseUnknown = 1, ParseFailed = -1 } ParseRes;
@ -104,6 +115,9 @@ int ieee80211_chan_to_freq(const char *country, u8 op_class, u8 chan);
int ieee80211_is_dfs(int freq);
int supp_rates_11b_only(struct ieee802_11_elems *elems);
int mb_ies_info_by_ies(struct mb_ies_info *info, const u8 *ies_buf,
size_t ies_len);
struct wpabuf * mb_ies_by_info(struct mb_ies_info *info);
const char * fc2str(u16 fc);
#endif /* IEEE802_11_COMMON_H */