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Add generic GAS request mechanism

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The new gas_request and gas_response_get commands can be used to request
arbitary GAS queries to be performed. These can be used with ANQP or
with other (including vendor specific) advertisement protocols.

gas_request <BSSID> <AdvProtoID> [Query]
gas_response_get <addr> <dialog token> [offset,length]

For example, ANQP query for Capability list in interactive wpa_cli
session:

> gas_request 02:00:00:00:01:00 00 000102000101
<3>GAS-RESPONSE-INFO addr=02:00:00:00:01:00 dialog_token=0
status_code=0 resp_len=32
> gas_response_get 02:00:00:00:01:00 00
01011c00010102010501070108010c01dddd0c00506f9a110200020304050607
> gas_response_get 02:00:00:00:01:00 00 0,10
01011c00010102010501
> gas_response_get 02:00:00:00:01:00 00 10,10
070108010c01dddd0c00
> gas_response_get 02:00:00:00:01:00 00 20,10
506f9a11020002030405
> gas_response_get 02:00:00:00:01:00 00 30,2
0607

It should be noted that the maximum length of the response buffer is
currently 4096 bytes which allows about 2000 bytes of the response data
to be fetched with a single gas_response_get command. If the response is
longer, it can be fetched in pieces as shown in the example above.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2012-08-27 18:13:10 +03:00 • committed by Jouni Malinen
parent b52f084cfa
commit b1f122964e
9 changed files with 239 additions and 4 deletions
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4
src/common/gas.c
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@ -1,7 +1,7 @@
/*
* Generic advertisement service (GAS) (IEEE 802.11u)
* Copyright (c) 2009, Atheros Communications
* Copyright (c) 2011, Qualcomm Atheros
* Copyright (c) 2011-2012, Qualcomm Atheros
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
@ -31,7 +31,7 @@ gas_build_req(u8 action, u8 dialog_token, size_t size)
}
static struct wpabuf * gas_build_initial_req(u8 dialog_token, size_t size)
struct wpabuf * gas_build_initial_req(u8 dialog_token, size_t size)
{
return gas_build_req(WLAN_PA_GAS_INITIAL_REQ, dialog_token,
size);