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Holger Freyther gerrit-no-reply at lists.osmocom.orgHolger Freyther has uploaded this change for review. ( https://gerrit.osmocom.org/13838
Change subject: xudt: Implement address and data extraction
......................................................................
xudt: Implement address and data extraction
The cellmgr-ng unfortunately looks at the data being sent and can't
handle the presence of XUDT at all. Add the structure definition
and refactor extraction code to work on offsets. Add a unit test.
Change-Id: I45a7447cc1be432fff34849e0e35abc0410cf153
---
M include/osmocom/sccp/sccp_types.h
M src/sccp.c
M tests/sccp/sccp_test.c
3 files changed, 142 insertions(+), 14 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmo-sccp refs/changes/38/13838/1
diff --git a/include/osmocom/sccp/sccp_types.h b/include/osmocom/sccp/sccp_types.h
index ab7f74f..18b54f4 100644
--- a/include/osmocom/sccp/sccp_types.h
+++ b/include/osmocom/sccp/sccp_types.h
@@ -422,6 +422,60 @@
uint8_t data[0];
} __attribute__((packed));
+/* Extended unitdata (XUDT) */
+struct sccp_data_ext_unitdata {
+ /* mandatory */
+ uint8_t type;
+ uint8_t proto_class;
+ uint8_t hop_counter;
+
+ /* variable */
+ uint8_t variable_called;
+ uint8_t variable_calling;
+ uint8_t variable_data;
+
+#if VARIABLE
+ called party address
+ calling party address
+ data
+#endif
+
+#if OPTIONAL
+ segmentation
+ importance
+#endif
+
+ uint8_t data[0];
+
+} __attribute__((packed));
+
+
+/* Extended unitdata service (XUDTS) */
+struct sccp_data_ext_unitdata_service {
+ /* mandantory */
+ uint8_t type;
+ uint8_t return_cause;
+ uint8_t hop_counter;
+
+
+ /* variable */
+ uint8_t variable_called;
+ uint8_t variable_calling;
+ uint8_t variable_data;
+
+#if VARIABLE
+ called party address
+ calling party address
+ data
+#endif
+
+#if OPTIONAL
+ segmentation
+ importancd
+#endif
+
+ uint8_t data[0];
+} __attribute__((packed));
struct sccp_data_it {
/* mandatory */
diff --git a/src/sccp.c b/src/sccp.c
index ec0f3b7..c14e850 100644
--- a/src/sccp.c
+++ b/src/sccp.c
@@ -406,37 +406,46 @@
return 0;
}
-int _sccp_parse_udt(struct msgb *msgb, struct sccp_parse_result *result)
+struct udt_offsets {
+ uint32_t header_size;
+ uint32_t called_offset;
+ uint32_t calling_offset;
+ uint32_t data_offset;
+};
+
+static int _sccp_parse_unitdata(struct msgb *msgb, struct sccp_parse_result *result,
+ const struct udt_offsets *offs)
{
- static const uint32_t header_size = sizeof(struct sccp_data_unitdata);
- static const uint32_t called_offset = offsetof(struct sccp_data_unitdata, variable_called);
- static const uint32_t calling_offset = offsetof(struct sccp_data_unitdata, variable_calling);
- static const uint32_t data_offset = offsetof(struct sccp_data_unitdata, variable_data);
+ uint8_t variable_called;
+ uint8_t variable_calling;
+ uint8_t variable_data;
- struct sccp_data_unitdata *udt = (struct sccp_data_unitdata *)msgb->l2h;
-
- if (msgb_l2len(msgb) < header_size) {
+ if (msgb_l2len(msgb) < offs->header_size) {
LOGP(DSCCP, LOGL_ERROR, "msgb < header_size %u %u\n",
- msgb_l2len(msgb), header_size);
+ msgb_l2len(msgb), offs->header_size);
return -1;
}
+ variable_called = msgb->l2h[offs->called_offset];
+ variable_calling = msgb->l2h[offs->calling_offset];
+ variable_data = msgb->l2h[offs->data_offset];
+
/* copy out the calling and called address. Add the off */
- if (copy_address(&result->called, called_offset + udt->variable_called, msgb) != 0)
+ if (copy_address(&result->called, offs->called_offset + variable_called, msgb) != 0)
return -1;
- if (copy_address(&result->calling, calling_offset + udt->variable_calling, msgb) != 0)
+ if (copy_address(&result->calling, offs->calling_offset + variable_calling, msgb) != 0)
return -1;
/* we don't have enough size for the data */
- if (msgb_l2len(msgb) < data_offset + udt->variable_data + 1) {
+ if (msgb_l2len(msgb) < offs->data_offset + variable_data + 1) {
LOGP(DSCCP, LOGL_ERROR, "msgb < header + offset %u %u %u\n",
- msgb_l2len(msgb), header_size, udt->variable_data);
+ msgb_l2len(msgb), offs->header_size, variable_data);
return -1;
}
- msgb->l3h = &udt->data[udt->variable_data];
+ msgb->l3h = &msgb->l2h[offs->data_offset + variable_data + 1];
result->data_len = msgb_l3len(msgb);
if (msgb_l3len(msgb) < msgb->l3h[-1]) {
@@ -448,6 +457,30 @@
return 0;
}
+int _sccp_parse_udt(struct msgb *msgb, struct sccp_parse_result *result)
+{
+ static const struct udt_offsets offsets = {
+ .header_size = sizeof(struct sccp_data_unitdata),
+ .called_offset = offsetof(struct sccp_data_unitdata, variable_called),
+ .calling_offset = offsetof(struct sccp_data_unitdata, variable_calling),
+ .data_offset = offsetof(struct sccp_data_unitdata, variable_data),
+ };
+
+ return _sccp_parse_unitdata(msgb, result, &offsets);
+}
+
+static int _sccp_parse_xudt(struct msgb *msgb, struct sccp_parse_result *result)
+{
+ static const struct udt_offsets offsets = {
+ .header_size = sizeof(struct sccp_data_ext_unitdata),
+ .called_offset = offsetof(struct sccp_data_ext_unitdata, variable_called),
+ .calling_offset = offsetof(struct sccp_data_ext_unitdata, variable_calling),
+ .data_offset = offsetof(struct sccp_data_ext_unitdata, variable_data),
+ };
+
+ return _sccp_parse_unitdata(msgb, result, &offsets);
+}
+
static int _sccp_parse_it(struct msgb *msgb, struct sccp_parse_result *result)
{
static const uint32_t header_size = sizeof(struct sccp_data_it);
@@ -1457,6 +1490,9 @@
case SCCP_MSG_TYPE_UDT:
return _sccp_parse_udt(msg, result);
break;
+ case SCCP_MSG_TYPE_XUDT:
+ return _sccp_parse_xudt(msg, result);
+ break;
case SCCP_MSG_TYPE_IT:
return _sccp_parse_it(msg, result);
break;
diff --git a/tests/sccp/sccp_test.c b/tests/sccp/sccp_test.c
index ba9ff7a..29f343f 100644
--- a/tests/sccp/sccp_test.c
+++ b/tests/sccp/sccp_test.c
@@ -312,6 +312,32 @@
0x0f, 0x0c, 0x04, 0x00, 0x00,
};
+static const uint8_t xudt_test_src_gt[] = {
+0x00, 0x11, 0x04, 0x26, 0x18, 0x01, 0x30, 0x08,
+0x01
+};
+
+static const uint8_t xudt_test_dst_gt[] = {
+0x00, 0x61, 0x04, 0x15, 0x10, 0x80, 0x21, 0x35,
+0x98, 0x55, 0x08
+};
+
+static const uint8_t xudt_test[] = {
+0x11, 0x81, 0x02, 0x04, 0x11, 0x1C, 0x00, 0x0D,
+0x52, 0x06, 0x00, 0x61, 0x04, 0x15, 0x10, 0x80,
+0x21, 0x35, 0x98, 0x55, 0x08, 0x0B, 0x12, 0x95,
+0x00, 0x11, 0x04, 0x26, 0x18, 0x01, 0x30, 0x08,
+0x01, 0x44, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
+0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
+0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E,
+0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26,
+0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E,
+0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
+0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E,
+0x3F, 0x40, 0x41, 0x42, 0x43, 0x44
+};
+
static const struct sccp_parse_header_result parse_result[] = {
{
.msg_type = SCCP_MSG_TYPE_IT,
@@ -362,6 +388,18 @@
.src_gti_data = tcap_global_src_gti,
.src_gti_len = 9,
},
+ {
+ .msg_type = SCCP_MSG_TYPE_XUDT,
+ .input = xudt_test,
+ .input_len = sizeof(xudt_test),
+ .wanted_len = 68,
+ .dst_ssn = 6,
+ .dst_gti_data = xudt_test_dst_gt,
+ .dst_gti_len = 11,
+ .src_ssn = 149,
+ .src_gti_data = xudt_test_src_gt,
+ .src_gti_len = 9,
+ },
};
--
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Gerrit-Project: libosmo-sccp
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I45a7447cc1be432fff34849e0e35abc0410cf153
Gerrit-Change-Number: 13838
Gerrit-PatchSet: 1
Gerrit-Owner: Holger Freyther <holger at freyther.de>
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