[L] Change in libosmo-sccp[master]: sccp: Introduce initial support for SCCP LUDT + LUDTS messages
pespin has submitted this change. ( https://gerrit.osmocom.org/c/libosmo-sccp/+/34467?usp=email )
Change subject: sccp: Introduce initial support for SCCP LUDT + LUDTS messages ......................................................................
sccp: Introduce initial support for SCCP LUDT + LUDTS messages
* LUDT/LUDTS is now properly received and passed along to the app. * LUDT/LUDTS is now used if the data to transmit spans more than 255 bytes.
Related: SYS#6566 Change-Id: Ic91abfc921f5e4f36045bfa325333112cddd9fa6 --- M include/osmocom/sccp/sccp_types.h M include/osmocom/sigtran/xua_msg.h M src/sccp2sua.c M src/xua_msg.c M tests/xua/sccp_test_data.c M tests/xua/sccp_test_data.h M tests/xua/xua_test.c M tests/xua/xua_test.ok 8 files changed, 447 insertions(+), 47 deletions(-)
Approvals: Jenkins Builder: Verified osmith: Looks good to me, but someone else must approve fixeria: Looks good to me, approved
diff --git a/include/osmocom/sccp/sccp_types.h b/include/osmocom/sccp/sccp_types.h index 1618d60..17018d2 100644 --- a/include/osmocom/sccp/sccp_types.h +++ b/include/osmocom/sccp/sccp_types.h @@ -488,6 +488,64 @@ uint8_t data[0]; } __attribute__((packed));
+/* Long unitdata (LUDT), ITU-T Q.713 4.20 */ +struct sccp_data_long_unitdata { + /* mandatory */ + uint8_t type; + uint8_t proto_class; + uint8_t hop_counter; + + /* variable */ + uint16_t variable_called; + uint16_t variable_calling; + uint16_t variable_data; + /* optional */ + uint16_t optional_start; + +#if VARIABLE + called party address + calling party address + data +#endif + +#if OPTIONAL + segmentation + importance +#endif + + uint8_t data[0]; + +} __attribute__((packed)); + +/* Long unitdata service (LUDTS), ITU-T Q.713 4.21 */ +struct sccp_data_long_unitdata_service { + /* mandantory */ + uint8_t type; + uint8_t return_cause; + uint8_t hop_counter; + + + /* variable */ + uint16_t variable_called; + uint16_t variable_calling; + uint16_t variable_data; + /* optional */ + uint16_t optional_start; + +#if VARIABLE + called party address + calling party address + data +#endif + +#if OPTIONAL + segmentation + importance +#endif + + uint8_t data[0]; +} __attribute__((packed)); + struct sccp_data_it { /* mandatory */ uint8_t type; diff --git a/include/osmocom/sigtran/xua_msg.h b/include/osmocom/sigtran/xua_msg.h index 11bce6f..5f877ed 100644 --- a/include/osmocom/sigtran/xua_msg.h +++ b/include/osmocom/sigtran/xua_msg.h @@ -94,6 +94,7 @@ const uint32_t *xua_msg_get_u32p(const struct xua_msg *xua, uint16_t iei, uint32_t *out); const char *xua_msg_part_get_str(const struct xua_msg_part *part); const char *xua_msg_get_str(const struct xua_msg *xua, uint16_t iei); +int xua_msg_get_len(const struct xua_msg *xua, uint16_t iei); void xua_part_add_gt(struct msgb *msg, const struct osmo_sccp_gt *gt); int xua_msg_add_sccp_addr(struct xua_msg *xua, uint16_t iei, const struct osmo_sccp_addr *addr);
diff --git a/src/sccp2sua.c b/src/sccp2sua.c index cdab771..811cc55 100644 --- a/src/sccp2sua.c +++ b/src/sccp2sua.c @@ -338,10 +338,17 @@ }
/*! \brief convenience wrapper around sccp_addr_to_sua() for variable mandatory addresses */ -static int sccp_addr_to_sua_ptr(struct xua_msg *xua, uint16_t iei, const uint8_t *ptr_addr) +static int sccp_addr_to_sua_ptr(struct xua_msg *xua, uint16_t iei, const uint8_t *ptr_addr, bool ptr_addr_is_long) { - const uint8_t *addr = ptr_addr + *ptr_addr + 1; - unsigned int addrlen = *(ptr_addr + *ptr_addr); + const uint8_t *addr; + unsigned int addrlen; + + if (ptr_addr_is_long) /* +1: Distance from MSB of pointer */ + addr = ptr_addr + 1 + osmo_load16le(ptr_addr); + else + addr = ptr_addr + *ptr_addr; + addrlen = *addr; + addr++;
return sccp_addr_to_sua(xua, iei, addr, addrlen); } @@ -368,9 +375,10 @@ /*! \brief Add a "SCCP Variable Mandatory Part" (Address format) to the given msgb * \param msg Message buffer to which part shall be added * \param[out] var_ptr pointer to relative pointer in SCCP header + * \param[in] var_ptr_is_long Whether the var_ptr field is 2 bytes long (network order) * \param[in] xua xUA message from which to use address * \param[in] iei xUA information element identifier of address */ -static int sccp_add_var_addr(struct msgb *msg, uint8_t *var_ptr, const struct xua_msg *xua, uint16_t iei) +static int sccp_add_var_addr(struct msgb *msg, uint8_t *var_ptr, bool var_ptr_is_long, const struct xua_msg *xua, uint16_t iei) { struct xua_msg_part *part = xua_msg_find_tag(xua, iei); uint8_t *lenbyte; @@ -383,7 +391,10 @@ /* first allocate one byte for the length */ lenbyte = msgb_put(msg, 1); /* update the relative pointer to the length byte */ - *var_ptr = lenbyte - var_ptr; + if (var_ptr_is_long) /* -1: Distance from MSB of pointer */ + osmo_store16le(lenbyte - var_ptr - 1, var_ptr); + else + *var_ptr = lenbyte - var_ptr;
/* then append the encoded SCCP address */ rc = sua_addr_to_sccp(msg, part); @@ -426,6 +437,37 @@ return part->len; }
+/*! \brief Add a "SCCP Long Variable Mandatory Part" to the given msgb + * \param msg Message buffer to which part shall be added + * \param[out] var_ptr pointer to relative pointer in SCCP header + * \param[in] xua xUA message from which to use source data + * \param[in] iei xUA information element identifier of source data */ +static int sccp_add_long_variable_part(struct msgb *msg, uint8_t *var_ptr, const struct xua_msg *xua, uint16_t iei) +{ + struct xua_msg_part *part = xua_msg_find_tag(xua, iei); + uint8_t *lenbyte; + uint8_t *cur; + if (!part) { + LOGP(DLSUA, LOGL_ERROR, "Cannot find IEI %u in SUA message\n", iei); + return -ENODEV; + } + + /* first allocate 2 bytes for the length */ + lenbyte = msgb_put(msg, 2); + /* update the relative pointer to the length byte. + * This is only used in LUDT and LUDTS, so the pointer is always 2 bytes. + * -1: Distance from MSB of pointer */ + osmo_store16le(lenbyte - var_ptr - 1, var_ptr); + + /* then append the encoded SCCP address */ + cur = msgb_put(msg, part->len); + memcpy(cur, part->dat, part->len); + + /* store the encoded length of the address, LSB first */ + osmo_store16le(part->len, lenbyte); + + return part->len; +}
/*! \brief validate that SCCP part with pointer + length doesn't exceed msg tail * \param[in] msg Message containing SCCP address @@ -455,6 +497,45 @@ return true; }
+/*! \brief validate that SCCP part with long pointer (2 bytes) + length doesn't exceed msg tail + * \param[in] msg Message containing SCCP address (LUDT or LUDTS) + * \param[in] ptr_addr pointer to byte with relative SCCP long pointer (uint16_t, 2 bytes in network order) + * \param[in] len_is_long whether the length field at the starting of the value field pointer to by ptr_addr is 2 bytes long. + * \returns true if OK; false if message inconsistent */ +static bool sccp_longptr_part_consistent(const struct msgb *msg, const uint8_t *ptr_addr, bool len_is_long) +{ + const uint8_t *ptr; + uint8_t offs; + uint16_t len; + + /* check the address of the relative pointer is within msg */ + if (ptr_addr < msg->data || ptr_addr > msg->tail) { + LOGP(DLSUA, LOGL_ERROR, "ptr_addr outside msg boundary\n"); + return false; + } + + /* +1: Distance from MSB of pointer */ + ptr = ptr_addr + 1 + osmo_load16le(ptr_addr); + if (ptr > msg->tail) { + LOGP(DLSUA, LOGL_ERROR, "ptr %p points outside msg boundary %p\n", ptr, msg->tail); + return false; + } + + /* at destination of relative pointer is the length */ + if (len_is_long) { + offs = 2; + len = osmo_load16le(ptr); + } else { + offs = 1; + len = *ptr; + } + if (ptr + offs + len > msg->tail) { + LOGP(DLSUA, LOGL_ERROR, "ptr + len points outside msg boundary\n"); + return false; + } + return true; +} + /*! \brief convenience wrapper around xua_msg_add_data() for variable mandatory data */ static int sccp_data_to_sua_ptr(struct xua_msg *xua, uint16_t iei, const uint8_t *ptr_addr) { @@ -464,6 +545,20 @@ return xua_msg_add_data(xua, iei, addrlen, addr); }
+/*! \brief convenience wrapper around xua_msg_add_data() for variable mandatory data */ +static int sccp_longdata_to_sua_ptr(struct xua_msg *xua, uint16_t iei, const uint8_t *ptr_addr) +{ + const uint16_t ptr_value = osmo_load16le(ptr_addr); + /* +1: Distance from MSB of pointer */ + const uint8_t *addrlen_ptr = ptr_addr + 1 + ptr_value; + /* +2: size of length field */ + const uint8_t *addr = addrlen_ptr + 2; + unsigned int addrlen = osmo_load16le(addrlen_ptr); + + return xua_msg_add_data(xua, iei, addrlen, addr); +} + + /*! \brief Convert a given SCCP option to SUA and add it to given xua_msg * \param xua caller-provided xUA message to which option is to be added * \param[in] sccp_opt_type SCCP option type (PNC) @@ -697,22 +792,34 @@ /*! \brief convert SCCP optional part to list of SUA options * \param[in] msg Message buffer holding SCCP message * \param[in] ptr_opt address of relative pointer to optional part + * \param[in] ptr_opt_is_long whether ptr_opt is a long pointer (2 bytes, network order) * \param xua caller-provided xUA message to which options are added * \returns \ref xua in case of success, NULL on error (xua not freed!) */ -static struct xua_msg *sccp_to_xua_opt(const struct msgb *msg, const uint8_t *ptr_opt, struct xua_msg *xua) +static struct xua_msg *sccp_to_xua_opt(const struct msgb *msg, const uint8_t *ptr_opt, bool ptr_opt_is_long, struct xua_msg *xua) { const uint8_t *opt_start, *oneopt; + uint16_t ptr_opt_value;
/* some bounds checking */ - if (ptr_opt < msg->data || ptr_opt > msg->tail) + if (ptr_opt < msg->data) return NULL; + if (ptr_opt > msg->tail - (ptr_opt_is_long ? 2 : 1)) + return NULL; + + if (ptr_opt_is_long) + ptr_opt_value = osmo_load16le(ptr_opt); + else + ptr_opt_value = *ptr_opt;
/* Q.713 section 2.3 "Coding of pointers": pointer value all zeros used to indicate that no optional param is present. */ - if (*ptr_opt == 0) + if (ptr_opt_value == 0) return xua;
- opt_start = ptr_opt + *ptr_opt; + if (ptr_opt_is_long) /* +1: Distance from MSB of pointer */ + opt_start = ptr_opt + 1 + ptr_opt_value; + else + opt_start = ptr_opt + ptr_opt_value; if (opt_start > msg->tail) return NULL;
@@ -983,7 +1090,7 @@ return false; }
-static int xua_ies_to_sccp_opts(struct msgb *msg, uint8_t *ptr_opt, +static int xua_ies_to_sccp_opts(struct msgb *msg, uint8_t *ptr_opt, bool ptr_opt_is_long, enum sccp_message_types type, const struct xua_msg *xua) { const struct xua_msg_part *part; @@ -1002,10 +1109,15 @@ if (any_added) { msgb_put_u8(msg, SCCP_PNC_END_OF_OPTIONAL); /* store relative pointer to start of optional part */ - *ptr_opt = old_tail - ptr_opt; + if (ptr_opt_is_long) /* -1: Distance from MSB of pointer */ + osmo_store16le(old_tail - ptr_opt - 1, ptr_opt); + else + *ptr_opt = old_tail - ptr_opt; } else { /* If nothing was added, simply update the pointer to 0 to signal the optional part is omitted. */ ptr_opt[0] = 0; + if (ptr_opt_is_long) + ptr_opt[1] = 0; }
return 0; @@ -1036,9 +1148,9 @@ /* Variable Part */ if (!sccp_ptr_part_consistent(msg, &req->variable_called)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &req->variable_called); + sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &req->variable_called, false); /* Optional Part */ - return sccp_to_xua_opt(msg, &req->optional_start, xua); + return sccp_to_xua_opt(msg, &req->optional_start, false, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1055,10 +1167,10 @@ if (rc < 0) return rc; /* Variable Part */ - sccp_add_var_addr(msg, &req->variable_called, xua, SUA_IEI_DEST_ADDR); + sccp_add_var_addr(msg, &req->variable_called, false, xua, SUA_IEI_DEST_ADDR);
/* Optional Part */ - return xua_ies_to_sccp_opts(msg, &req->optional_start, req->type, xua); + return xua_ies_to_sccp_opts(msg, &req->optional_start, false, req->type, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1071,7 +1183,7 @@ xua_msg_add_u32(xua, SUA_IEI_DEST_REF, load_24be(&cnf->destination_local_reference)); xua_msg_add_u32(xua, SUA_IEI_SRC_REF, load_24be(&cnf->source_local_reference)); /* Optional Part */ - return sccp_to_xua_opt(msg, &cnf->optional_start, xua); + return sccp_to_xua_opt(msg, &cnf->optional_start, false, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1091,7 +1203,7 @@ if (rc < 0) return rc; /* Optional Part */ - return xua_ies_to_sccp_opts(msg, &cnf->optional_start, cnf->type, xua); + return xua_ies_to_sccp_opts(msg, &cnf->optional_start, false, cnf->type, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1103,7 +1215,7 @@ xua_msg_add_u32(xua, SUA_IEI_DEST_REF, load_24be(&ref->destination_local_reference)); xua_msg_add_u32(xua, SUA_IEI_CAUSE, SUA_CAUSE_T_REFUSAL | ref->cause); /* Optional Part */ - return sccp_to_xua_opt(msg, &ref->optional_start, xua); + return sccp_to_xua_opt(msg, &ref->optional_start, false, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1120,7 +1232,7 @@ return rc; ref->cause = xua_msg_get_u32(xua, SUA_IEI_CAUSE) & 0xff; /* Optional Part */ - return xua_ies_to_sccp_opts(msg, &ref->optional_start, ref->type, xua); + return xua_ies_to_sccp_opts(msg, &ref->optional_start, false, ref->type, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1133,7 +1245,7 @@ xua_msg_add_u32(xua, SUA_IEI_SRC_REF, load_24be(&rlsd->source_local_reference)); xua_msg_add_u32(xua, SUA_IEI_CAUSE, SUA_CAUSE_T_RELEASE | rlsd->release_cause); /* Optional Part */ - return sccp_to_xua_opt(msg, &rlsd->optional_start, xua); + return sccp_to_xua_opt(msg, &rlsd->optional_start, false, xua); }
static int sua_to_sccp_rlsd(struct msgb *msg, const struct xua_msg *xua) @@ -1153,7 +1265,7 @@ rlsd->release_cause = xua_msg_get_u32(xua, SUA_IEI_CAUSE) & 0xff;
/* Optional Part */ - return xua_ies_to_sccp_opts(msg, &rlsd->optional_start, rlsd->type, xua); + return xua_ies_to_sccp_opts(msg, &rlsd->optional_start, false, rlsd->type, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1227,10 +1339,10 @@ /* Variable Part */ if (!sccp_ptr_part_consistent(msg, &udt->variable_called)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &udt->variable_called); + sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &udt->variable_called, false); if (!sccp_ptr_part_consistent(msg, &udt->variable_calling)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, &udt->variable_calling); + sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, &udt->variable_calling, false); if (!sccp_ptr_part_consistent(msg, &udt->variable_data)) return NULL; sccp_data_to_sua_ptr(xua, SUA_IEI_DATA, &udt->variable_data); @@ -1239,11 +1351,18 @@ }
static int sua_to_sccp_xudt(struct msgb *msg, const struct xua_msg *xua); +static int sua_to_sccp_ludt(struct msgb *msg, const struct xua_msg *xua);
static int sua_to_sccp_udt(struct msgb *msg, const struct xua_msg *xua) { struct sccp_data_unitdata *udt;
+ /* Use LUDT if length exceeds 255 (single byte length field) */ + /* TODO: start using LUDT sooner if called/calling party contain GT or if + * segmentation and/or importance present, see Q.715 Section 8.3.2 */ + if (xua_msg_get_len(xua, SUA_IEI_DATA) > 255) + return sua_to_sccp_ludt(msg, xua); + /* Use XUDT if we have a hop counter on the SUA side */ if (xua_msg_find_tag(xua, SUA_IEI_S7_HOP_CTR)) return sua_to_sccp_xudt(msg, xua); @@ -1254,8 +1373,8 @@ udt->type = SCCP_MSG_TYPE_UDT; udt->proto_class = xua_msg_get_u32(xua, SUA_IEI_PROTO_CLASS); /* Variable Part */ - sccp_add_var_addr(msg, &udt->variable_called, xua, SUA_IEI_DEST_ADDR); - sccp_add_var_addr(msg, &udt->variable_calling, xua, SUA_IEI_SRC_ADDR); + sccp_add_var_addr(msg, &udt->variable_called, false, xua, SUA_IEI_DEST_ADDR); + sccp_add_var_addr(msg, &udt->variable_calling, false, xua, SUA_IEI_SRC_ADDR); sccp_add_variable_part(msg, &udt->variable_data, xua, SUA_IEI_DATA); return 0; } @@ -1271,21 +1390,28 @@ /* Variable Part */ if (!sccp_ptr_part_consistent(msg, &xudt->variable_called)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &xudt->variable_called); + sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &xudt->variable_called, false); if (!sccp_ptr_part_consistent(msg, &xudt->variable_calling)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, &xudt->variable_calling); + sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, &xudt->variable_calling, false); if (!sccp_ptr_part_consistent(msg, &xudt->variable_data)) return NULL; sccp_data_to_sua_ptr(xua, SUA_IEI_DATA, &xudt->variable_data); /* Optional Part */ - return sccp_to_xua_opt(msg, &xudt->optional_start, xua); + return sccp_to_xua_opt(msg, &xudt->optional_start, false, xua);
}
static int sua_to_sccp_xudt(struct msgb *msg, const struct xua_msg *xua) { struct sccp_data_ext_unitdata *xudt; + + /* Use LUDT if length exceeds 255 (single byte length field) */ + /* TODO: start using LUDTS sooner if called/calling party contain GT or if + * segmentation and/or importance present, see Q.715 Section 8.3.2 */ + if (xua_msg_get_len(xua, SUA_IEI_DATA) > 255) + return sua_to_sccp_ludt(msg, xua); + xudt = (struct sccp_data_ext_unitdata *) msgb_put(msg, sizeof(*xudt));
/* Fixed Part */ @@ -1293,11 +1419,50 @@ xudt->proto_class = xua_msg_get_u32(xua, SUA_IEI_PROTO_CLASS); xudt->hop_counter = xua_msg_get_u32(xua, SUA_IEI_S7_HOP_CTR); /* Variable Part */ - sccp_add_var_addr(msg, &xudt->variable_called, xua, SUA_IEI_DEST_ADDR); - sccp_add_var_addr(msg, &xudt->variable_calling, xua, SUA_IEI_SRC_ADDR); + sccp_add_var_addr(msg, &xudt->variable_called, false, xua, SUA_IEI_DEST_ADDR); + sccp_add_var_addr(msg, &xudt->variable_calling, false, xua, SUA_IEI_SRC_ADDR); sccp_add_variable_part(msg, &xudt->variable_data, xua, SUA_IEI_DATA); /* Optional Part */ - return xua_ies_to_sccp_opts(msg, &xudt->optional_start, xudt->type, xua); + return xua_ies_to_sccp_opts(msg, &xudt->optional_start, false, xudt->type, xua); +} + +/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ +static struct xua_msg *sccp_to_xua_ludt(struct msgb *msg, struct xua_msg *xua) +{ + struct sccp_data_long_unitdata *ludt = (struct sccp_data_long_unitdata *)msg->l2h; + + /* Fixed Part */ + xua_msg_add_u32(xua, SUA_IEI_PROTO_CLASS, ludt->proto_class); + xua_msg_add_u32(xua, SUA_IEI_S7_HOP_CTR, ludt->hop_counter); + /* Variable Part */ + if (!sccp_longptr_part_consistent(msg, (uint8_t *)&ludt->variable_called, false)) + return NULL; + sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, (uint8_t *)&ludt->variable_called, true); + if (!sccp_longptr_part_consistent(msg, (uint8_t *)&ludt->variable_calling, false)) + return NULL; + sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, (uint8_t *)&ludt->variable_calling, true); + if (!sccp_longptr_part_consistent(msg, (uint8_t *)&ludt->variable_data, true)) + return NULL; + sccp_longdata_to_sua_ptr(xua, SUA_IEI_DATA, (uint8_t *)&ludt->variable_data); + /* Optional Part */ + return sccp_to_xua_opt(msg, (uint8_t *)&ludt->optional_start, true, xua); +} + +static int sua_to_sccp_ludt(struct msgb *msg, const struct xua_msg *xua) +{ + struct sccp_data_long_unitdata *ludt; + ludt = (struct sccp_data_long_unitdata *) msgb_put(msg, sizeof(*ludt)); + + /* Fixed Part */ + ludt->type = SCCP_MSG_TYPE_LUDT; + ludt->proto_class = xua_msg_get_u32(xua, SUA_IEI_PROTO_CLASS); + ludt->hop_counter = xua_msg_get_u32(xua, SUA_IEI_S7_HOP_CTR); + /* Variable Part */ + sccp_add_var_addr(msg, (uint8_t *)&ludt->variable_called, true, xua, SUA_IEI_DEST_ADDR); + sccp_add_var_addr(msg, (uint8_t *)&ludt->variable_calling, true, xua, SUA_IEI_SRC_ADDR); + sccp_add_long_variable_part(msg, (uint8_t *)&ludt->variable_data, xua, SUA_IEI_DATA); + /* Optional Part */ + return xua_ies_to_sccp_opts(msg, (uint8_t *)&ludt->optional_start, true, ludt->type, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1311,10 +1476,10 @@ /* Variable Part */ if (!sccp_ptr_part_consistent(msg, &udts->variable_called)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &udts->variable_called); + sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &udts->variable_called, false); if (!sccp_ptr_part_consistent(msg, &udts->variable_calling)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, &udts->variable_calling); + sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, &udts->variable_calling, false); if (!sccp_ptr_part_consistent(msg, &udts->variable_data)) return NULL; sccp_data_to_sua_ptr(xua, SUA_IEI_DATA, &udts->variable_data); @@ -1323,11 +1488,18 @@ }
static int sua_to_sccp_xudts(struct msgb *msg, const struct xua_msg *xua); +static int sua_to_sccp_ludts(struct msgb *msg, const struct xua_msg *xua);
static int sua_to_sccp_udts(struct msgb *msg, const struct xua_msg *xua) { struct sccp_data_unitdata_service *udts;
+ /* Use LUDTS if length exceeds 255 (single byte length field) */ + /* TODO: start using LUDTS sooner if called/calling party contain GT, + * see Q.715 Section 8.3.2 */ + if (xua_msg_get_len(xua, SUA_IEI_DATA) > 255) + return sua_to_sccp_ludts(msg, xua); + /* Use XUDTS if we have a hop counter */ if (xua_msg_find_tag(xua, SUA_IEI_S7_HOP_CTR)) return sua_to_sccp_xudts(msg, xua); @@ -1338,8 +1510,8 @@ udts->type = SCCP_MSG_TYPE_UDTS; udts->return_cause = xua_msg_get_u32(xua, SUA_IEI_CAUSE) & 0xff; /* Variable Part */ - sccp_add_var_addr(msg, &udts->variable_called, xua, SUA_IEI_DEST_ADDR); - sccp_add_var_addr(msg, &udts->variable_calling, xua, SUA_IEI_SRC_ADDR); + sccp_add_var_addr(msg, &udts->variable_called, false, xua, SUA_IEI_DEST_ADDR); + sccp_add_var_addr(msg, &udts->variable_calling, false, xua, SUA_IEI_SRC_ADDR); sccp_add_variable_part(msg, &udts->variable_data, xua, SUA_IEI_DATA); return 0; } @@ -1354,17 +1526,17 @@ xua_msg_add_u32(xua, SUA_IEI_CAUSE, SUA_CAUSE_T_RETURN | xudts->return_cause); xua_msg_add_u32(xua, SUA_IEI_S7_HOP_CTR, xudts->hop_counter); /* Variable Part */ - if (!sccp_ptr_part_consistent(msg, &xudts->variable_called)) + if (!sccp_ptr_part_consistent(msg, (uint8_t *)&xudts->variable_called)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &xudts->variable_called); - if (!sccp_ptr_part_consistent(msg, &xudts->variable_calling)) + sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, &xudts->variable_called, false); + if (!sccp_ptr_part_consistent(msg, (uint8_t *)&xudts->variable_calling)) return NULL; - sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, &xudts->variable_calling); - if (!sccp_ptr_part_consistent(msg, &xudts->variable_data)) + sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, &xudts->variable_calling, false); + if (!sccp_ptr_part_consistent(msg, (uint8_t *)&xudts->variable_data)) return NULL; sccp_data_to_sua_ptr(xua, SUA_IEI_DATA, &xudts->variable_data); /* Optional Part */ - return sccp_to_xua_opt(msg, &xudts->optional_start, xua); + return sccp_to_xua_opt(msg, &xudts->optional_start, false, xua); }
static int sua_to_sccp_xudts(struct msgb *msg, const struct xua_msg *xua) @@ -1377,11 +1549,51 @@ xudts->return_cause = xua_msg_get_u32(xua, SUA_IEI_CAUSE) & 0xff; xudts->hop_counter = xua_msg_get_u32(xua, SUA_IEI_S7_HOP_CTR); /* Variable Part */ - sccp_add_var_addr(msg, &xudts->variable_called, xua, SUA_IEI_DEST_ADDR); - sccp_add_var_addr(msg, &xudts->variable_calling, xua, SUA_IEI_SRC_ADDR); + sccp_add_var_addr(msg, &xudts->variable_called, false, xua, SUA_IEI_DEST_ADDR); + sccp_add_var_addr(msg, &xudts->variable_calling, false, xua, SUA_IEI_SRC_ADDR); sccp_add_variable_part(msg, &xudts->variable_data, xua, SUA_IEI_DATA); /* Optional Part */ - return xua_ies_to_sccp_opts(msg, &xudts->optional_start, xudts->type, xua); + return xua_ies_to_sccp_opts(msg, &xudts->optional_start, false, xudts->type, xua); +} + +/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ +static struct xua_msg *sccp_to_xua_ludts(const struct msgb *msg, struct xua_msg *xua) +{ + const struct sccp_data_long_unitdata_service *ludts; + ludts = (const struct sccp_data_long_unitdata_service *)msg->l2h; + + /* Fixed Part */ + xua_msg_add_u32(xua, SUA_IEI_CAUSE, SUA_CAUSE_T_RETURN | ludts->return_cause); + xua_msg_add_u32(xua, SUA_IEI_S7_HOP_CTR, ludts->hop_counter); + /* Variable Part */ + if (!sccp_longptr_part_consistent(msg, (uint8_t *)&ludts->variable_called, false)) + return NULL; + sccp_addr_to_sua_ptr(xua, SUA_IEI_DEST_ADDR, (uint8_t *)&ludts->variable_called, true); + if (!sccp_longptr_part_consistent(msg, (uint8_t *)&ludts->variable_calling, false)) + return NULL; + sccp_addr_to_sua_ptr(xua, SUA_IEI_SRC_ADDR, (uint8_t *)&ludts->variable_calling, true); + if (!sccp_longptr_part_consistent(msg, (uint8_t *)&ludts->variable_data, true)) + return NULL; + sccp_longdata_to_sua_ptr(xua, SUA_IEI_DATA, (uint8_t *)&ludts->variable_data); + /* Optional Part */ + return sccp_to_xua_opt(msg, (uint8_t *)&ludts->optional_start, true, xua); +} + +static int sua_to_sccp_ludts(struct msgb *msg, const struct xua_msg *xua) +{ + struct sccp_data_long_unitdata_service *ludts; + ludts = (struct sccp_data_long_unitdata_service *) msgb_put(msg, sizeof(*ludts)); + + /* Fixed Part */ + ludts->type = SCCP_MSG_TYPE_LUDTS; + ludts->return_cause = xua_msg_get_u32(xua, SUA_IEI_CAUSE) & 0xff; + ludts->hop_counter = xua_msg_get_u32(xua, SUA_IEI_S7_HOP_CTR); + /* Variable Part */ + sccp_add_var_addr(msg, (uint8_t *)&ludts->variable_called, true, xua, SUA_IEI_DEST_ADDR); + sccp_add_var_addr(msg, (uint8_t *)&ludts->variable_calling, true, xua, SUA_IEI_SRC_ADDR); + sccp_add_long_variable_part(msg, (uint8_t *)&ludts->variable_data, xua, SUA_IEI_DATA); + /* Optional Part */ + return xua_ies_to_sccp_opts(msg, (uint8_t *)&ludts->optional_start, true, ludts->type, xua); }
/*! \returns \ref xua in case of success, NULL on error (xua not freed!) */ @@ -1526,6 +1738,16 @@ if (!sccp_to_xua_xudts(msg, xua)) goto malformed; return xua; + case SCCP_MSG_TYPE_LUDT: + xua->hdr = XUA_HDR(SUA_MSGC_CL, SUA_CL_CLDT); + if (!sccp_to_xua_ludt(msg, xua)) + goto malformed; + return xua; + case SCCP_MSG_TYPE_LUDTS: + xua->hdr = XUA_HDR(SUA_MSGC_CL, SUA_CL_CLDR); + if (!sccp_to_xua_ludts(msg, xua)) + goto malformed; + return xua; /* Unsupported Message Types */ case SCCP_MSG_TYPE_DT2: case SCCP_MSG_TYPE_AK: @@ -1533,8 +1755,6 @@ case SCCP_MSG_TYPE_EA: case SCCP_MSG_TYPE_RSR: case SCCP_MSG_TYPE_RSC: - case SCCP_MSG_TYPE_LUDT: - case SCCP_MSG_TYPE_LUDTS: LOGP(DLSUA, LOGL_ERROR, "Unsupported SCCP message %s\n", osmo_sccp_msg_type_name(msg->l2h[0])); xua_msg_free(xua); diff --git a/src/xua_msg.c b/src/xua_msg.c index 443b73e..5671e1a 100644 --- a/src/xua_msg.c +++ b/src/xua_msg.c @@ -330,6 +330,14 @@ return xua_msg_part_get_str(part); }
+int xua_msg_get_len(const struct xua_msg *xua, uint16_t iei) +{ + struct xua_msg_part *part = xua_msg_find_tag(xua, iei); + if (!part) + return -1; + return part->len; +} + void xua_part_add_gt(struct msgb *msg, const struct osmo_sccp_gt *gt) { uint16_t *len_ptr; diff --git a/tests/xua/sccp_test_data.c b/tests/xua/sccp_test_data.c index c7c8f27..525a066 100644 --- a/tests/xua/sccp_test_data.c +++ b/tests/xua/sccp_test_data.c @@ -100,3 +100,56 @@ 0x01, 0x41, 0x84, 0x01, 0x04, 0x30, 0x03, 0x82, 0x01, 0x18, 0x00, 0x00, 0x00, 0x00 }; + +/* SCCP LUDT message containing a RANAP RESET */ +const uint8_t ludt_ranap_reset[40] = { + 0x13, 0x00, 0x0f, 0x07, 0x00, 0x0a, 0x00, 0x0d, + 0x00, 0x00, 0x00, 0x04, 0x43, 0xc4, 0x04, 0x8e, + 0x04, 0x43, 0xe9, 0x03, 0x8e, 0x11, 0x00, 0x00, + 0x09, 0x00, 0x0d, 0x00, 0x00, 0x02, 0x00, 0x04, + 0x40, 0x01, 0x42, 0x00, 0x03, 0x00, 0x01, 0x00 +}; + +const uint8_t ludt_data300bytes[323] = { + 0x13, 0x00, 0x0f, 0x07, 0x00, 0x0a, 0x00, 0x0d, + 0x00, 0x00, 0x00, 0x04, 0x43, 0xc4, 0x04, 0x8e, + 0x04, 0x43, 0xe9, 0x03, 0x8e, 0x2c, 0x01, 0xab, /* 0x2c, 0x01 (network order) = len = 300 */ + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, + 0xab, 0xab, 0xab, +}; diff --git a/tests/xua/sccp_test_data.h b/tests/xua/sccp_test_data.h index 3d70549..cdae9dc 100644 --- a/tests/xua/sccp_test_data.h +++ b/tests/xua/sccp_test_data.h @@ -12,3 +12,5 @@ extern const uint8_t bssmap_released[14]; extern const uint8_t bssmap_release_complete[7]; extern const uint8_t tcap_global_title[183]; +extern const uint8_t ludt_ranap_reset[40]; +extern const uint8_t ludt_data300bytes[323]; diff --git a/tests/xua/xua_test.c b/tests/xua/xua_test.c index 628d860..f957369 100644 --- a/tests/xua/xua_test.c +++ b/tests/xua/xua_test.c @@ -375,6 +375,7 @@
const uint32_t sua_proto_class0 = 0; const uint32_t sua_proto_class2 = 2; +const uint32_t sua_hop_ctr_0x0f = 0x0f; const uint32_t sua_loc_ref_bsc = 0x10203; const uint32_t sua_loc_ref_msc = 0x00003; const uint32_t sua_cause0 = 0x00003; @@ -500,13 +501,41 @@ .parts = { }, }, + }, { + /* This case expectedly prints "Input != re-encoded output!" because input is a + * LUDT with a small payload size fitting 1-byte length, while our (re-)encoder + * encodes it as UDT in this case because it's enough to encode and transmit the + * message. Both are valid. */ + .name = "LUDT-RANAP_RELEASE", + .sccp = PANDSIZ(ludt_ranap_reset), + .sua = { + .hdr = _XUA_HDR(SUA_MSGC_CL, SUA_CL_CLDT), + .parts = { + PARTU32(SUA_IEI_PROTO_CLASS, &sua_proto_class0), + PARTU32(SUA_IEI_S7_HOP_CTR, &sua_hop_ctr_0x0f), + PARTARR(SUA_IEI_DEST_ADDR, sua_addr_ssn_bssmap), + PARTARR(SUA_IEI_SRC_ADDR, sua_addr_ssn_bssmap), + }, + }, + }, { + .name = "LUDT-data300bytes", + .sccp = PANDSIZ(ludt_data300bytes), + .sua = { + .hdr = _XUA_HDR(SUA_MSGC_CL, SUA_CL_CLDT), + .parts = { + PARTU32(SUA_IEI_PROTO_CLASS, &sua_proto_class0), + PARTU32(SUA_IEI_S7_HOP_CTR, &sua_hop_ctr_0x0f), + PARTARR(SUA_IEI_DEST_ADDR, sua_addr_ssn_bssmap), + PARTARR(SUA_IEI_SRC_ADDR, sua_addr_ssn_bssmap), + }, + }, }, };
static void test_sccp2sua_case(const struct sccp2sua_testcase *tcase) { struct xua_msg *xua; - struct msgb *msg = msgb_alloc(300, "SCCP2SUA Test Input"); + struct msgb *msg = msgb_alloc(500, "SCCP2SUA Test Input"); struct msgb *msg2;
printf("\n=> %s\n", tcase->name); diff --git a/tests/xua/xua_test.ok b/tests/xua/xua_test.ok index cb6aab1..3072a95 100644 --- a/tests/xua/xua_test.ok +++ b/tests/xua/xua_test.ok @@ -92,6 +92,21 @@ Decoded SUA: HDR=(CL:CLDT,V=0,LEN=0), PART(T=Protocol Class,L=4,D=00000081), PART(T=Destination Address,L=32,D=0001000580010014000000040a00010453840900170000008003000800000007), PART(T=Source Address,L=32,D=0001000580010014000000040c00010444872000206500008003000800000006), PART(T=Data,L=154,D=6581974804260001984904510103df6c8188a181850201440201073080a780a08004012b30803012830110840107850791445776671697860120300682011884010400000000a306040142840105a306040151840105a306040131840105a309040112840105820102a309040111840105810101a306040114840100a30b0401418401043003830110a30b040141840104300382011800000000) Re-Encoding decoded SUA to SCCP SCCP Output: [L2]> 09 81 03 0d 18 0a 12 07 00 12 04 53 84 09 00 17 0b 12 06 00 12 04 44 87 20 00 20 65 9a 65 81 97 48 04 26 00 01 98 49 04 51 01 03 df 6c 81 88 a1 81 85 02 01 44 02 01 07 30 80 a7 80 a0 80 04 01 2b 30 80 30 12 83 01 10 84 01 07 85 07 91 44 57 76 67 16 97 86 01 20 30 06 82 01 18 84 01 04 00 00 00 00 a3 06 04 01 42 84 01 05 a3 06 04 01 51 84 01 05 a3 06 04 01 31 84 01 05 a3 09 04 01 12 84 01 05 82 01 02 a3 09 04 01 11 84 01 05 81 01 01 a3 06 04 01 14 84 01 00 a3 0b 04 01 41 84 01 04 30 03 83 01 10 a3 0b 04 01 41 84 01 04 30 03 82 01 18 00 00 00 00 + +=> LUDT-RANAP_RELEASE +SCCP Input: [L2]> 13 00 0f 07 00 0a 00 0d 00 00 00 04 43 c4 04 8e 04 43 e9 03 8e 11 00 00 09 00 0d 00 00 02 00 04 40 01 42 00 03 00 01 00 +Transcoding message SCCP -> XUA +Decoded SUA: HDR=(CL:CLDT,V=0,LEN=0), PART(T=Protocol Class,L=4,D=00000000), PART(T=SS7 Hop Counter,L=4,D=0000000f), PART(T=Destination Address,L=20,D=0002000380020008000004c4800300080000008e), PART(T=Source Address,L=20,D=0002000380020008000003e9800300080000008e), PART(T=Data,L=17,D=0009000d00000200044001420003000100) +Re-Encoding decoded SUA to SCCP +SCCP Output: [L2]> 11 00 0f 04 08 0c 00 04 43 c4 04 8e 04 43 e9 03 8e 11 00 09 00 0d 00 00 02 00 04 40 01 42 00 03 00 01 00 +Input != re-encoded output! + +=> LUDT-data300bytes +SCCP Input: [L2]> 13 00 0f 07 00 0a 00 0d 00 00 00 04 43 c4 04 8e 04 43 e9 03 8e 2c 01 ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab +Transcoding message SCCP -> XUA +Decoded SUA: HDR=(CL:CLDT,V=0,LEN=0), PART(T=Protocol Class,L=4,D=00000000), PART(T=SS7 Hop Counter,L=4,D=0000000f), PART(T=Destination Address,L=20,D=0002000380020008000004c4800300080000008e), PART(T=Source Address,L=20,D=0002000380020008000003e9800300080000008e), PART(T=Data,L=300,D=abababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababab) +Re-Encoding decoded SUA to SCCP +SCCP Output: [L2]> 13 00 0f 07 00 0a 00 0d 00 00 00 04 43 c4 04 8e 04 43 e9 03 8e 2c 01 ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab Parsing M3UA Message Parsing Nested M3UA Routing Key IE Testing SCCP Address Encode/Decode
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