nat: And out the skip_indicator/transaction id from the gsm48 header
We need to and out the protocol discriminator as call control
might have use transactions. This has only failed for the USSD
filter so far as this must deal with transactions.
diff --git a/openbsc/src/osmo-bsc_nat/bsc_ussd.c b/openbsc/src/osmo-bsc_nat/bsc_ussd.c
index fd38f78..48ecad5 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_ussd.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_ussd.c
@@ -309,6 +309,7 @@
{
uint32_t len;
uint8_t msg_type;
+ uint8_t proto;
struct gsm48_hdr *hdr48;
struct bsc_nat_acc_lst *lst;
struct ussd_request req;
@@ -343,8 +344,9 @@
if (!hdr48)
return 0;
+ proto = hdr48->proto_discr & 0x0f;
msg_type = hdr48->msg_type & 0xbf;
- if (hdr48->proto_discr != GSM48_PDISC_NC_SS || msg_type != GSM0480_MTYPE_REGISTER)
+ if (proto != GSM48_PDISC_NC_SS || msg_type != GSM0480_MTYPE_REGISTER)
return 0;
/* now check if it is a IMSI we care about */