04.08: apply new bitmask functions, fix bitmask use
Replace hardcoded protocol discriminator and message type bitmasks with
function calls recently introduced in libosmocore.
Note that the release 98 bitmasks slightly differ from the release 99 bitmasks.
This patch uses the "default" gsm48_hdr_msg_type invocation, thus it depends on
libosmocore whether 98 or 99 bitmasks are used.
In some places, use of the bitmask was erratic. Fix these implicitly by
employing the bitmask functions:
* silent_call.c: silent_call_reroute(): add missing bitmask for MM.
* bsc_msg_filter.c: bsc_msg_filter_initial(): RR vs. MM messages.
* osmo_bsc_filter.c: bsc_find_msc() and bsc_scan_bts_msg(): RR vs. MM
messages.
* bsc_nat_rewrite.c: bsc_nat_rewrite_msg(): SMS vs. CC messages.
* bsc_ussd.c: no bitmask is applicable for the message types used here.
* gb_proxy.c: gbproxy_imsi_acquisition(): missing bit mask for pdisc.
In gprs_gb_parse.c: gprs_gb_parse_dtap(), add a log notice for unexpected
message types.
diff --git a/openbsc/src/gprs/gb_proxy.c b/openbsc/src/gprs/gb_proxy.c
index 9551335..6e6b03b 100644
--- a/openbsc/src/gprs/gb_proxy.c
+++ b/openbsc/src/gprs/gb_proxy.c
@@ -462,8 +462,8 @@
if (link_info->imsi_acq_pending && link_info->imsi_len > 0) {
int is_ident_resp =
parse_ctx->g48_hdr &&
- parse_ctx->g48_hdr->proto_discr == GSM48_PDISC_MM_GPRS &&
- parse_ctx->g48_hdr->msg_type == GSM48_MT_GMM_ID_RESP;
+ gsm48_hdr_pdisc(parse_ctx->g48_hdr) == GSM48_PDISC_MM_GPRS &&
+ gsm48_hdr_msg_type(parse_ctx->g48_hdr) == GSM48_MT_GMM_ID_RESP;
/* The IMSI is now available */
gbproxy_flush_stored_messages(peer, msg, now, link_info,
diff --git a/openbsc/src/gprs/gprs_gb_parse.c b/openbsc/src/gprs/gprs_gb_parse.c
index 6096854..63ac902 100644
--- a/openbsc/src/gprs/gprs_gb_parse.c
+++ b/openbsc/src/gprs/gprs_gb_parse.c
@@ -329,17 +329,20 @@
struct gprs_gb_parse_context *parse_ctx)
{
struct gsm48_hdr *g48h;
+ uint8_t pdisc;
+ uint8_t msg_type;
if (gprs_shift_v_fixed(&data, &data_len, sizeof(*g48h), (uint8_t **)&g48h) <= 0)
return 0;
parse_ctx->g48_hdr = g48h;
- if ((g48h->proto_discr & 0x0f) != GSM48_PDISC_MM_GPRS &&
- (g48h->proto_discr & 0x0f) != GSM48_PDISC_SM_GPRS)
+ pdisc = gsm48_hdr_pdisc(g48h);
+ if (pdisc != GSM48_PDISC_MM_GPRS && pdisc != GSM48_PDISC_SM_GPRS)
return 1;
- switch (g48h->msg_type) {
+ msg_type = gsm48_hdr_msg_type(g48h);
+ switch (msg_type) {
case GSM48_MT_GMM_ATTACH_REQ:
return gprs_gb_parse_gmm_attach_req(data, data_len, parse_ctx);
@@ -376,6 +379,10 @@
break;
default:
+ LOGP(DLLC, LOGL_NOTICE,
+ "Unknown GSM 04.08 message type 0x%02hhx for protocol"
+ " discriminator 0x%02hhx.\n",
+ msg_type, pdisc);
break;
};
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index d93ba3f..9d94c24 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -2089,7 +2089,7 @@
int gsm0408_gprs_rcvmsg(struct msgb *msg, struct gprs_llc_llme *llme)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
- uint8_t pdisc = gh->proto_discr & 0x0f;
+ uint8_t pdisc = gsm48_hdr_pdisc(gh);
struct sgsn_mm_ctx *mmctx;
struct gprs_ra_id ra_id;
int rc = -EINVAL;
diff --git a/openbsc/src/libbsc/bsc_api.c b/openbsc/src/libbsc/bsc_api.c
index 504f044..e6d820d 100644
--- a/openbsc/src/libbsc/bsc_api.c
+++ b/openbsc/src/libbsc/bsc_api.c
@@ -563,6 +563,7 @@
struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api;
struct gsm48_hdr *gh;
uint8_t pdisc;
+ uint8_t msg_type;
int rc;
if (msgb_l3len(msg) < sizeof(*gh)) {
@@ -571,7 +572,8 @@
}
gh = msgb_l3(msg);
- pdisc = gh->proto_discr & 0x0f;
+ pdisc = gsm48_hdr_pdisc(gh);
+ msg_type = gsm48_hdr_msg_type(gh);
/* the idea is to handle all RR messages here, and only hand
* MM/CC/SMS-CP/LCS up to the MSC. Some messages like PAGING
@@ -581,7 +583,7 @@
* will call api->compl_l3() for it */
switch (pdisc) {
case GSM48_PDISC_RR:
- switch (gh->msg_type) {
+ switch (msg_type) {
case GSM48_MT_RR_GPRS_SUSP_REQ:
DEBUGP(DRR, "GRPS SUSPEND REQUEST\n");
break;
@@ -640,7 +642,7 @@
* messages, but we'd rather forward what we
* don't know than drop it... */
LOGP(DRR, LOGL_NOTICE, "BSC: Passing unknown 04.08 "
- "RR message type 0x%02x to MSC\n", gh->msg_type);
+ "RR message type 0x%02x to MSC\n", msg_type);
if (api->dtap)
api->dtap(conn, link_id, msg);
}
diff --git a/openbsc/src/libfilter/bsc_msg_filter.c b/openbsc/src/libfilter/bsc_msg_filter.c
index eafeff4..115d376 100644
--- a/openbsc/src/libfilter/bsc_msg_filter.c
+++ b/openbsc/src/libfilter/bsc_msg_filter.c
@@ -339,15 +339,15 @@
cause->lu_reject_cause = GSM48_REJECT_PLMN_NOT_ALLOWED;
*imsi = NULL;
- proto = hdr48->proto_discr & 0x0f;
- msg_type = hdr48->msg_type & 0xbf;
+ proto = gsm48_hdr_pdisc(hdr48);
+ msg_type = gsm48_hdr_msg_type(hdr48);
if (proto == GSM48_PDISC_MM &&
msg_type == GSM48_MT_MM_LOC_UPD_REQUEST) {
*con_type = FLT_CON_TYPE_LU;
ret = _cr_check_loc_upd(req->ctx, &hdr48->data[0],
hdr48_len - sizeof(*hdr48), imsi);
} else if (proto == GSM48_PDISC_MM &&
- msg_type == GSM48_MT_MM_CM_SERV_REQ) {
+ msg_type == GSM48_MT_MM_CM_SERV_REQ) {
*con_type = FLT_CON_TYPE_CM_SERV_REQ;
ret = _cr_check_cm_serv_req(req->ctx, &hdr48->data[0],
hdr48_len - sizeof(*hdr48),
@@ -388,8 +388,8 @@
if (state->imsi_checked)
return 0;
- proto = hdr48->proto_discr & 0x0f;
- msg_type = hdr48->msg_type & 0xbf;
+ proto = gsm48_hdr_pdisc(hdr48);
+ msg_type = gsm48_hdr_msg_type(hdr48);
if (proto != GSM48_PDISC_MM || msg_type != GSM48_MT_MM_ID_RESP)
return 0;
diff --git a/openbsc/src/libmsc/gsm_04_08.c b/openbsc/src/libmsc/gsm_04_08.c
index d9d7390..9e70ba9 100644
--- a/openbsc/src/libmsc/gsm_04_08.c
+++ b/openbsc/src/libmsc/gsm_04_08.c
@@ -124,13 +124,12 @@
msg->lchan = trans->conn->lchan;
}
-
if (msg->lchan) {
struct e1inp_sign_link *sign_link =
msg->lchan->ts->trx->rsl_link;
msg->dst = sign_link;
- if ((gh->proto_discr & GSM48_PDISC_MASK) == GSM48_PDISC_CC)
+ if (gsm48_hdr_pdisc(gh) == GSM48_PDISC_CC)
DEBUGP(DCC, "(bts %d trx %d ts %d ti %02x) "
"Sending '%s' to MS.\n",
sign_link->trx->bts->nr,
@@ -1131,7 +1130,7 @@
struct gsm48_hdr *gh = msgb_l3(msg);
int rc = 0;
- switch (gh->msg_type & 0xbf) {
+ switch (gsm48_hdr_msg_type(gh)) {
case GSM48_MT_MM_LOC_UPD_REQUEST:
DEBUGP(DMM, "LOCATION UPDATING REQUEST: ");
rc = mm_rx_loc_upd_req(conn, msg);
@@ -1860,7 +1859,7 @@
static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
- uint8_t msg_type = gh->msg_type & 0xbf;
+ uint8_t msg_type = gsm48_hdr_msg_type(gh);
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
struct tlv_parsed tp;
struct gsm_mncc setup;
@@ -3487,7 +3486,7 @@
static int gsm0408_rcv_cc(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
- uint8_t msg_type = gh->msg_type & 0xbf;
+ uint8_t msg_type = gsm48_hdr_msg_type(gh);
uint8_t transaction_id = ((gh->proto_discr & 0xf0) ^ 0x80) >> 4; /* flip */
struct gsm_trans *trans = NULL;
int i, rc = 0;
@@ -3578,7 +3577,7 @@
int gsm0408_dispatch(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
- uint8_t pdisc = gh->proto_discr & 0x0f;
+ uint8_t pdisc = gsm48_hdr_pdisc(gh);
int rc = 0;
LOGP(DRLL, LOGL_DEBUG, "Dispatching 04.08 message, pdisc=%d\n", pdisc);
diff --git a/openbsc/src/libmsc/silent_call.c b/openbsc/src/libmsc/silent_call.c
index e9ece18..131a178 100644
--- a/openbsc/src/libmsc/silent_call.c
+++ b/openbsc/src/libmsc/silent_call.c
@@ -95,7 +95,8 @@
int silent_call_reroute(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
- uint8_t pdisc = gh->proto_discr & 0x0f;
+ uint8_t pdisc = gsm48_hdr_pdisc(gh);
+ uint8_t msg_type = gsm48_hdr_msg_type(gh);
int i;
/* if we're not part of a silent call, never reroute */
@@ -105,7 +106,7 @@
/* check if we are a special message that is handled in openbsc */
for (i = 0; i < ARRAY_SIZE(silent_call_accept); i++) {
if (silent_call_accept[i].pdisc == pdisc &&
- silent_call_accept[i].msg_type == gh->msg_type)
+ silent_call_accept[i].msg_type == msg_type)
return 0;
}
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_api.c b/openbsc/src/osmo-bsc/osmo_bsc_api.c
index fbeed77..d31e6c1 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_api.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_api.c
@@ -180,8 +180,8 @@
return;
gh = msgb_l3(msg);
- pdisc = gh->proto_discr & 0x0f;
- mtype = gh->msg_type & 0xbf;
+ pdisc = gsm48_hdr_pdisc(gh);
+ mtype = gsm48_hdr_msg_type(gh);
/* Is CM service request? */
if (pdisc == GSM48_PDISC_MM && mtype == GSM48_MT_MM_CM_SERV_REQ) {
@@ -341,8 +341,8 @@
struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
- uint8_t pdisc = gh->proto_discr & 0x0f;
- uint8_t mtype = gh->msg_type & 0xbf;
+ uint8_t pdisc = gsm48_hdr_pdisc(gh);
+ uint8_t mtype = gsm48_hdr_msg_type(gh);
struct osmo_msc_data *msc;
struct gsm_mncc_number called;
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_filter.c b/openbsc/src/osmo-bsc/osmo_bsc_filter.c
index 389a124..a71871f 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_filter.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_filter.c
@@ -141,8 +141,8 @@
}
gh = msgb_l3(msg);
- pdisc = gh->proto_discr & 0x0f;
- mtype = gh->msg_type & 0xbf;
+ pdisc = gsm48_hdr_pdisc(gh);
+ mtype = gsm48_hdr_msg_type(gh);
/*
* We are asked to select a MSC here but they are not equal. We
@@ -212,8 +212,8 @@
int bsc_scan_bts_msg(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
- uint8_t pdisc = gh->proto_discr & 0x0f;
- uint8_t mtype = gh->msg_type & 0xbf;
+ uint8_t pdisc = gsm48_hdr_pdisc(gh);
+ uint8_t mtype = gsm48_hdr_msg_type(gh);
if (pdisc == GSM48_PDISC_MM) {
if (mtype == GSM48_MT_MM_LOC_UPD_REQUEST)
@@ -347,7 +347,7 @@
gh = (struct gsm48_hdr *) msgb_l3(msg);
length -= (const char *)&gh->data[0] - (const char *)gh;
- mtype = gh->msg_type & 0xbf;
+ mtype = gsm48_hdr_msg_type(gh);
net = conn->bts->network;
msc = conn->sccp_con->msc;
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat.c b/openbsc/src/osmo-bsc_nat/bsc_nat.c
index cdab406..cacb919 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat.c
@@ -670,8 +670,8 @@
if (!hdr48)
return;
- proto = hdr48->proto_discr & 0x0f;
- msg_type = hdr48->msg_type & 0xbf;
+ proto = gsm48_hdr_pdisc(hdr48);
+ msg_type = gsm48_hdr_msg_type(hdr48);
if (proto == GSM48_PDISC_MM &&
msg_type == GSM48_MT_MM_CM_SERV_ACC)
con->authorized = 1;
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_rewrite.c b/openbsc/src/osmo-bsc_nat/bsc_nat_rewrite.c
index ca5670c..58667fe 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_rewrite.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_rewrite.c
@@ -594,8 +594,8 @@
return msg;
link_id = msg->l3h[1];
- proto = hdr48->proto_discr & 0x0f;
- msg_type = hdr48->msg_type & 0xbf;
+ proto = gsm48_hdr_pdisc(hdr48);
+ msg_type = gsm48_hdr_msg_type(hdr48);
if (proto == GSM48_PDISC_CC && msg_type == GSM48_MT_CC_SETUP)
new_msg = rewrite_setup(nat, msg, parsed, imsi, hdr48, len);
diff --git a/openbsc/src/osmo-bsc_nat/bsc_ussd.c b/openbsc/src/osmo-bsc_nat/bsc_ussd.c
index 1082414..2905c85 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_ussd.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_ussd.c
@@ -407,8 +407,8 @@
if (!hdr48)
return 0;
- proto = hdr48->proto_discr & 0x0f;
- msg_type = hdr48->msg_type & 0xbf;
+ proto = gsm48_hdr_pdisc(hdr48);
+ msg_type = gsm48_hdr_msg_type(hdr48);
ti = (hdr48->proto_discr & 0x70) >> 4;
if (proto != GSM48_PDISC_NC_SS)
return 0;