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GAS: Assign new dialog token even if previous one is free

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This makes the design more robust against unexpected duplicates since
each new GAS exchange gets a different dialog token compared to the
previous one.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2013-04-14 13:23:50 -07:00 committed by Jouni Malinen
parent 9e1ecab1c5
commit 7a56af545a
1 changed files with 5 additions and 1 deletions
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6
wpa_supplicant/gas_query.c
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@ -466,16 +466,20 @@ int gas_query_req(struct gas_query *gas, const u8 *dst, int freq,
{ {
struct gas_query_pending *query; struct gas_query_pending *query;
int dialog_token; int dialog_token;
static int next_start = 0;
if (wpabuf_len(req) < 3) if (wpabuf_len(req) < 3)
return -1; return -1;
for (dialog_token = 0; dialog_token < 256; dialog_token++) { for (dialog_token = 0; dialog_token < 256; dialog_token++) {
if (gas_query_dialog_token_available(gas, dst, dialog_token)) if (gas_query_dialog_token_available(
gas, dst, (next_start + dialog_token) % 256))
break; break;
} }
if (dialog_token == 256) if (dialog_token == 256)
return -1; /* Too many pending queries */ return -1; /* Too many pending queries */
dialog_token = (next_start + dialog_token) % 256;
next_start = (dialog_token + 1) % 256;
query = os_zalloc(sizeof(*query)); query = os_zalloc(sizeof(*query));
if (query == NULL) if (query == NULL)