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nrUE NAS: hotfix for get_msg_type()

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The version before this commit is wrong, taking wrong byte for msg_type
in some cases.

I don't have much time to implement a proper NAS PDU parser, so let's go
with hardcoded values.

Some later work will be done to have a cleaner solution. As of now, it's
too much work.
This commit is contained in:
Cedric Roux
2024-05-27 17:39:35 +02:00
parent 6c42ea6293
commit 4cc1bb5433
1 changed files with 30 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair3/NAS/NR_UE/nr_nas_msg_sim.c
+30 -19
View File
@@ -894,30 +894,41 @@ static void generatePduSessionEstablishRequest(nr_ue_nas_t *nas, as_nas_info_t *
}
uint8_t get_msg_type(uint8_t *pdu_buffer, uint32_t length) {
uint8_t msg_type = 0;
uint8_t offset = 0;
static uint8_t get_msg_type(uint8_t *pdu_buffer, uint32_t length)
{
if (pdu_buffer == NULL)
goto error;
if ((pdu_buffer != NULL) && (length > 0)) {
if (((nas_msg_header_t *)(pdu_buffer))->choice.security_protected_nas_msg_header_t.security_header_type > 0) {
offset += SECURITY_PROTECTED_5GS_NAS_MESSAGE_HEADER_LENGTH;
if (offset < length) {
msg_type = ((mm_msg_header_t *)(pdu_buffer + offset))->message_type;
/* get security header type */
if (length < 2)
goto error;
if (msg_type == FGS_DOWNLINK_NAS_TRANSPORT) {
dl_nas_transport_t tmp;
memcpy(&tmp, pdu_buffer + offset, sizeof(tmp));
msg_type = tmp.sm_nas_msg_header.message_type;
}
}
} else { // plain 5GS NAS message
msg_type = ((nas_msg_header_t *)(pdu_buffer))->choice.plain_nas_msg_header.message_type;
}
} else {
LOG_I(NAS, "[UE] Received invalid downlink message\n");
int security_header_type = pdu_buffer[1];
if (security_header_type == 0) {
/* plain NAS message */
if (length < 3)
goto error;
return pdu_buffer[2];
}
if (length < 10)
goto error;
int msg_type = pdu_buffer[9];
if (msg_type == FGS_DOWNLINK_NAS_TRANSPORT) {
if (length < 17)
goto error;
msg_type = pdu_buffer[16];
}
return msg_type;
error:
LOG_E(NAS, "[UE] Received invalid downlink message\n");
return 0;
}
static void send_nas_uplink_data_req(instance_t instance, const as_nas_info_t *initial_nas_msg)