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[sccp] Add method to create a dt1 packet.

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This commit is contained in:
Holger Hans Peter Freyther
2010-05-16 20:41:48 +08:00
parent f53a9d5471
commit 394520a8fd
2 changed files with 34 additions and 18 deletions
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1
openbsc/include/sccp/sccp.h
View File

@@ -151,6 +151,7 @@ struct sccp_source_reference sccp_src_ref_from_int(u_int32_t);
struct msgb *sccp_create_refuse(struct sccp_source_reference *src_ref, int cause, uint8_t *data, int length);
struct msgb *sccp_create_cc(struct sccp_source_reference *src_ref, struct sccp_source_reference *dst_ref);
struct msgb *sccp_create_rlsd(struct sccp_source_reference *src_ref, struct sccp_source_reference *dst_ref, int cause);
struct msgb *sccp_create_dt1(struct sccp_source_reference *dst_ref, uint8_t *data, uint8_t len);
/**
* Below this are helper functions and structs for parsing SCCP messages

51
openbsc/src/sccp/sccp.c
View File

@@ -790,34 +790,49 @@ static int _sccp_send_connection_request(struct sccp_connection *connection,
return 0;
}
static int _sccp_send_connection_data(struct sccp_connection *conn, struct msgb *_data)
struct msgb *sccp_create_dt1(struct sccp_source_reference *dst_ref, uint8_t *inp_data, uint8_t len)
{
struct msgb *msgb;
struct sccp_data_form1 *dt1;
u_int8_t *data;
int extra_size;
msgb = msgb_alloc_headroom(SCCP_MSG_SIZE,
SCCP_MSG_HEADROOM, "sccp dt1");
if (!msgb) {
LOGP(DSCCP, LOGL_ERROR, "Failed to create DT1 msg.\n");
return NULL;
}
msgb->l2h = &msgb->data[0];
dt1 = (struct sccp_data_form1 *) msgb_put(msgb, sizeof(*dt1));
dt1->type = SCCP_MSG_TYPE_DT1;
memcpy(&dt1->destination_local_reference, dst_ref,
sizeof(struct sccp_source_reference));
dt1->segmenting = 0;
/* copy the data */
dt1->variable_start = 1;
data = msgb_put(msgb, 1 + len);
data[0] = len;
memcpy(&data[1], inp_data, len);
return msgb;
}
static int _sccp_send_connection_data(struct sccp_connection *conn, struct msgb *_data)
{
struct msgb *msgb;
if (msgb_l3len(_data) < 2 || msgb_l3len(_data) > 256) {
LOGP(DSCCP, LOGL_ERROR, "data size too big, segmenting unimplemented.\n");
return -1;
}
extra_size = 1 + msgb_l3len(_data);
msgb = msgb_alloc_headroom(SCCP_MSG_SIZE,
SCCP_MSG_HEADROOM, "sccp dt1");
msgb->l2h = &msgb->data[0];
dt1 = (struct sccp_data_form1 *) msgb_put(msgb, sizeof(*dt1));
dt1->type = SCCP_MSG_TYPE_DT1;
memcpy(&dt1->destination_local_reference, &conn->destination_local_reference,
sizeof(struct sccp_source_reference));
dt1->segmenting = 0;
/* copy the data */
dt1->variable_start = 1;
data = msgb_put(msgb, extra_size);
data[0] = extra_size - 1;
memcpy(&data[1], _data->l3h, extra_size - 1);
msgb = sccp_create_dt1(&conn->destination_local_reference,
_data->l3h, msgb_l3len(_data));
if (!msgb)
return -1;
_send_msg(msgb);
return 0;