gsm_04_08.c: Some spoofing protection against two location updating requests

Do not allow two location updating requests on the same lchan. Such
an event is certainly spoofed and can confuse the internal logic of
the application. Prevent that.
This commit is contained in:
Holger Freyther 2009-06-06 13:54:44 +00:00
parent 7c19f74084
commit eaf0469a8b
1 changed files with 11 additions and 0 deletions

View File

@ -593,6 +593,17 @@ static int mm_rx_loc_upd_req(struct msgb *msg)
DEBUGP(DMM, "LUPDREQ: mi_type=0x%02x MI(%s) type=%s\n", mi_type, mi_string,
* Pseudo Spoof detection: Just drop a second/concurrent
* location updating request.
if (lchan->loc_operation) {
DEBUGP(DMM, "LUPDREQ: ignoring request due an existing one: %p.\n",
gsm0408_loc_upd_rej(lchan, GSM48_REJECT_PROTOCOL_ERROR);
return 0;
switch (mi_type) {