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authorHarald Welte <laforge@gnumonks.org>2016-04-25 18:46:22 +0200
committerHarald Welte <laforge@gnumonks.org>2016-05-06 11:21:06 +0200
commit3b6fb0880c3ab1e23a3d7d738d073b00c2a794c2 (patch)
tree081531b62c35cbe124e799ab104fe7913cb997f0 /src/gsm/gsup.c
parent9709b2e6fd84cab48fc7844475518f68f937bb01 (diff)
import gprs_gsup_message.[ch] from openbsc as gsup.[ch]0.9.4
Move those routines from OpenBSC to libosmogsm, so they can be re-used from other programs. I think it was a mistake to add them only inside the openbsc repository in the first place. We need to pay more attention to this in the future.
Diffstat (limited to 'src/gsm/gsup.c')
-rw-r--r--src/gsm/gsup.c472
1 files changed, 472 insertions, 0 deletions
diff --git a/src/gsm/gsup.c b/src/gsm/gsup.c
new file mode 100644
index 0000000..7a439d4
--- /dev/null
+++ b/src/gsm/gsup.c
@@ -0,0 +1,472 @@
+/* Osmocom Subscriber Update Protocol message encoder/decoder */
+
+/*
+ * (C) 2014 by Sysmocom s.f.m.c. GmbH
+ * (C) 2015 by Holger Hans Peter Freyther
+ * (C) 2016 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * Author: Jacob Erlbeck
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <osmocom/gsm/tlv.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/gsm/gsm48_ie.h>
+#include <osmocom/gsm/gsup.h>
+
+#include <stdint.h>
+
+static int decode_pdp_info(uint8_t *data, size_t data_len,
+ struct osmo_gsup_pdp_info *pdp_info)
+{
+ int rc;
+ uint8_t tag;
+ uint8_t *value;
+ size_t value_len;
+
+ /* specific parts */
+ while (data_len > 0) {
+ enum osmo_gsup_iei iei;
+
+ rc = osmo_shift_tlv(&data, &data_len, &tag, &value, &value_len);
+ if (rc < 0)
+ return -GMM_CAUSE_PROTO_ERR_UNSPEC;
+
+ iei = tag;
+
+ switch (iei) {
+ case OSMO_GSUP_PDP_CONTEXT_ID_IE:
+ pdp_info->context_id = osmo_decode_big_endian(value, value_len);
+ break;
+
+ case OSMO_GSUP_PDP_TYPE_IE:
+ pdp_info->pdp_type =
+ osmo_decode_big_endian(value, value_len) & 0x0fff;
+ break;
+
+ case OSMO_GSUP_ACCESS_POINT_NAME_IE:
+ pdp_info->apn_enc = value;
+ pdp_info->apn_enc_len = value_len;
+ break;
+
+ case OSMO_GSUP_PDP_QOS_IE:
+ pdp_info->qos_enc = value;
+ pdp_info->qos_enc_len = value_len;
+ break;
+
+ default:
+ LOGP(DLGSUP, LOGL_ERROR,
+ "GSUP IE type %d not expected in PDP info\n", iei);
+ continue;
+ }
+ }
+
+ return 0;
+}
+
+static int decode_auth_info(uint8_t *data, size_t data_len,
+ struct osmo_auth_vector *auth_vector)
+{
+ int rc;
+ uint8_t tag;
+ uint8_t *value;
+ size_t value_len;
+ enum osmo_gsup_iei iei;
+ uint8_t presence = 0;
+
+ /* specific parts */
+ while (data_len > 0) {
+ rc = osmo_shift_tlv(&data, &data_len, &tag, &value, &value_len);
+ if (rc < 0)
+ return -GMM_CAUSE_PROTO_ERR_UNSPEC;
+
+ iei = tag;
+
+ switch (iei) {
+ case OSMO_GSUP_RAND_IE:
+ if (value_len != sizeof(auth_vector->rand))
+ goto parse_error;
+
+ memcpy(auth_vector->rand, value, value_len);
+ presence |= (1 << 0);
+ break;
+
+ case OSMO_GSUP_SRES_IE:
+ if (value_len != sizeof(auth_vector->sres))
+ goto parse_error;
+
+ memcpy(auth_vector->sres, value, value_len);
+ presence |= (1 << 1);
+ break;
+
+ case OSMO_GSUP_KC_IE:
+ if (value_len != sizeof(auth_vector->kc))
+ goto parse_error;
+
+ memcpy(auth_vector->kc, value, value_len);
+ presence |= (1 << 2);
+ break;
+
+ case OSMO_GSUP_IK_IE:
+ if (value_len != sizeof(auth_vector->ik))
+ goto parse_error;
+ memcpy(auth_vector->ik, value, value_len);
+ presence |= (1 << 4);
+ break;
+
+ case OSMO_GSUP_CK_IE:
+ if (value_len != sizeof(auth_vector->ck))
+ goto parse_error;
+ memcpy(auth_vector->ck, value, value_len);
+ presence |= (1 << 5);
+ break;
+
+ case OSMO_GSUP_AUTN_IE:
+ if (value_len != sizeof(auth_vector->autn))
+ goto parse_error;
+ memcpy(auth_vector->autn, value, value_len);
+ presence |= (1 << 6);
+ break;
+ case OSMO_GSUP_RES_IE:
+ if (value_len > sizeof(auth_vector->res))
+ goto parse_error;
+ memcpy(auth_vector->res, value, value_len);
+ auth_vector->res_len = value_len;
+ presence |= (1 << 7);
+ break;
+
+ default:
+ LOGP(DLGSUP, LOGL_ERROR,
+ "GSUP IE type %d not expected in PDP info\n", iei);
+ continue;
+ }
+ }
+
+ if (presence & 0x07)
+ auth_vector->auth_types |= OSMO_AUTH_TYPE_GSM;
+ if (presence & 0xf0)
+ auth_vector->auth_types |= OSMO_AUTH_TYPE_UMTS;
+
+ return 0;
+
+parse_error:
+ LOGP(DLGSUP, LOGL_ERROR,
+ "GSUP IE type %d, length %zu invalid in PDP info\n", iei, value_len);
+
+ return -1;
+}
+
+/*! Decode (parse) a GSUP message
+ * \param[in] const_data input data to be parsed
+ * \param[in] data_len length of input (\a const_data)
+ * \param[out] gsup_msg callee-allocated output data structure
+ * \returns 0 on success; negative otherwise
+ */
+int osmo_gsup_decode(const uint8_t *const_data, size_t data_len,
+ struct osmo_gsup_message *gsup_msg)
+{
+ int rc;
+ uint8_t tag;
+ /* the shift/match functions expect non-const pointers, but we'll
+ * either copy the data or cast pointers back to const before returning
+ * them
+ */
+ uint8_t *data = (uint8_t *)const_data;
+ uint8_t *value;
+ size_t value_len;
+ static const struct osmo_gsup_pdp_info empty_pdp_info = {0};
+ static const struct osmo_auth_vector empty_auth_info = {0};
+ static const struct osmo_gsup_message empty_gsup_message = {0};
+
+ *gsup_msg = empty_gsup_message;
+
+ /* generic part */
+ rc = osmo_shift_v_fixed(&data, &data_len, 1, &value);
+ if (rc < 0)
+ return -GMM_CAUSE_INV_MAND_INFO;
+
+ gsup_msg->message_type = osmo_decode_big_endian(value, 1);
+
+ rc = osmo_match_shift_tlv(&data, &data_len, OSMO_GSUP_IMSI_IE,
+ &value, &value_len);
+
+ if (rc <= 0)
+ return -GMM_CAUSE_INV_MAND_INFO;
+
+ if (value_len * 2 + 1 > sizeof(gsup_msg->imsi))
+ return -GMM_CAUSE_INV_MAND_INFO;
+
+ /* Note that gsm48_decode_bcd_number expects the number of encoded IMSI
+ * octets in the first octet. By coincidence (the TLV encoding) the byte
+ * before the value part already contains this length so we can use it
+ * here.
+ */
+ OSMO_ASSERT(value[-1] == value_len);
+ gsm48_decode_bcd_number(gsup_msg->imsi, sizeof(gsup_msg->imsi),
+ value - 1, 0);
+
+ /* specific parts */
+ while (data_len > 0) {
+ enum osmo_gsup_iei iei;
+ struct osmo_gsup_pdp_info pdp_info;
+ struct osmo_auth_vector auth_info;
+
+ rc = osmo_shift_tlv(&data, &data_len, &tag, &value, &value_len);
+ if (rc < 0)
+ return -GMM_CAUSE_PROTO_ERR_UNSPEC;
+
+ iei = tag;
+
+ switch (iei) {
+ case OSMO_GSUP_IMSI_IE:
+ case OSMO_GSUP_PDP_TYPE_IE:
+ case OSMO_GSUP_ACCESS_POINT_NAME_IE:
+ case OSMO_GSUP_RAND_IE:
+ case OSMO_GSUP_SRES_IE:
+ case OSMO_GSUP_KC_IE:
+ LOGP(DLGSUP, LOGL_NOTICE,
+ "GSUP IE type %d not expected (ignored)\n", iei);
+ continue;
+
+ case OSMO_GSUP_CAUSE_IE:
+ gsup_msg->cause = osmo_decode_big_endian(value, value_len);
+ break;
+
+ case OSMO_GSUP_CANCEL_TYPE_IE:
+ gsup_msg->cancel_type =
+ osmo_decode_big_endian(value, value_len) + 1;
+ break;
+
+ case OSMO_GSUP_PDP_INFO_COMPL_IE:
+ gsup_msg->pdp_info_compl = 1;
+ break;
+
+ case OSMO_GSUP_FREEZE_PTMSI_IE:
+ gsup_msg->freeze_ptmsi = 1;
+ break;
+
+ case OSMO_GSUP_PDP_CONTEXT_ID_IE:
+ /* When these IE appear in the top-level part of the
+ * message, they are used by Delete Subscr Info to delete
+ * single entries. We don't have an extra list for
+ * these but use the PDP info list instead */
+
+ /* fall through */
+
+ case OSMO_GSUP_PDP_INFO_IE:
+ if (gsup_msg->num_pdp_infos >= OSMO_GSUP_MAX_NUM_PDP_INFO) {
+ LOGP(DLGSUP, LOGL_ERROR,
+ "GSUP IE type %d (PDP_INFO) max exceeded\n",
+ iei);
+ return -GMM_CAUSE_COND_IE_ERR;
+ }
+
+ pdp_info = empty_pdp_info;
+
+ if (iei == OSMO_GSUP_PDP_INFO_IE) {
+ rc = decode_pdp_info(value, value_len, &pdp_info);
+ if (rc < 0)
+ return rc;
+ pdp_info.have_info = 1;
+ } else {
+ pdp_info.context_id =
+ osmo_decode_big_endian(value, value_len);
+ }
+
+ gsup_msg->pdp_infos[gsup_msg->num_pdp_infos++] =
+ pdp_info;
+ break;
+
+ case OSMO_GSUP_AUTH_TUPLE_IE:
+ if (gsup_msg->num_auth_vectors >= OSMO_GSUP_MAX_NUM_AUTH_INFO) {
+ LOGP(DLGSUP, LOGL_ERROR,
+ "GSUP IE type %d (AUTH_INFO) max exceeded\n",
+ iei);
+ return -GMM_CAUSE_INV_MAND_INFO;
+ }
+
+ auth_info = empty_auth_info;
+
+ rc = decode_auth_info(value, value_len, &auth_info);
+ if (rc < 0)
+ return rc;
+
+ gsup_msg->auth_vectors[gsup_msg->num_auth_vectors++] =
+ auth_info;
+ break;
+
+ case OSMO_GSUP_AUTS_IE:
+ if (value_len != 16) {
+ LOGP(DLGSUP, LOGL_ERROR,
+ "AUTS length != 16 received\n");
+ return -GMM_CAUSE_COND_IE_ERR;
+ }
+ gsup_msg->auts = value;
+ break;
+
+ case OSMO_GSUP_MSISDN_IE:
+ gsup_msg->msisdn_enc = value;
+ gsup_msg->msisdn_enc_len = value_len;
+ break;
+
+ case OSMO_GSUP_HLR_NUMBER_IE:
+ gsup_msg->hlr_enc = value;
+ gsup_msg->hlr_enc_len = value_len;
+ break;
+
+ default:
+ LOGP(DLGSUP, LOGL_NOTICE,
+ "GSUP IE type %d unknown\n", iei);
+ continue;
+ }
+ }
+
+ return 0;
+}
+
+static void encode_pdp_info(struct msgb *msg, enum osmo_gsup_iei iei,
+ const struct osmo_gsup_pdp_info *pdp_info)
+{
+ uint8_t *len_field;
+ size_t old_len;
+ uint8_t u8;
+
+ len_field = msgb_tlv_put(msg, iei, 0, NULL) - 1;
+ old_len = msgb_length(msg);
+
+ u8 = pdp_info->context_id;
+ msgb_tlv_put(msg, OSMO_GSUP_PDP_CONTEXT_ID_IE, sizeof(u8), &u8);
+
+ if (pdp_info->pdp_type) {
+ msgb_tlv_put(msg, OSMO_GSUP_PDP_TYPE_IE,
+ OSMO_GSUP_PDP_TYPE_SIZE,
+ osmo_encode_big_endian(pdp_info->pdp_type | 0xf000,
+ OSMO_GSUP_PDP_TYPE_SIZE));
+ }
+
+ if (pdp_info->apn_enc) {
+ msgb_tlv_put(msg, OSMO_GSUP_ACCESS_POINT_NAME_IE,
+ pdp_info->apn_enc_len, pdp_info->apn_enc);
+ }
+
+ if (pdp_info->qos_enc) {
+ msgb_tlv_put(msg, OSMO_GSUP_PDP_QOS_IE,
+ pdp_info->qos_enc_len, pdp_info->qos_enc);
+ }
+
+ /* Update length field */
+ *len_field = msgb_length(msg) - old_len;
+}
+
+static void encode_auth_info(struct msgb *msg, enum osmo_gsup_iei iei,
+ const struct osmo_auth_vector *auth_vector)
+{
+ uint8_t *len_field;
+ size_t old_len;
+
+ len_field = msgb_tlv_put(msg, iei, 0, NULL) - 1;
+ old_len = msgb_length(msg);
+
+ msgb_tlv_put(msg, OSMO_GSUP_RAND_IE,
+ sizeof(auth_vector->rand), auth_vector->rand);
+
+ msgb_tlv_put(msg, OSMO_GSUP_SRES_IE,
+ sizeof(auth_vector->sres), auth_vector->sres);
+
+ msgb_tlv_put(msg, OSMO_GSUP_KC_IE,
+ sizeof(auth_vector->kc), auth_vector->kc);
+
+ /* Update length field */
+ *len_field = msgb_length(msg) - old_len;
+}
+
+/*! Encode a GSUP message
+ * \param[out] msg message buffer to which encoded message is written
+ * \param[in] gsup_msg \ref osmo_gsup_message data to be encoded
+ */
+void osmo_gsup_encode(struct msgb *msg, const struct osmo_gsup_message *gsup_msg)
+{
+ uint8_t u8;
+ int idx;
+ uint8_t bcd_buf[GSM48_MI_SIZE] = {0};
+ size_t bcd_len;
+
+ /* generic part */
+ OSMO_ASSERT(gsup_msg->message_type);
+ msgb_v_put(msg, gsup_msg->message_type);
+
+ bcd_len = gsm48_encode_bcd_number(bcd_buf, sizeof(bcd_buf), 0,
+ gsup_msg->imsi);
+
+ OSMO_ASSERT(bcd_len > 1);
+
+ /* Note that gsm48_encode_bcd_number puts the length into the first
+ * octet. Since msgb_tlv_put will add this length byte, we'll have to
+ * skip it */
+ msgb_tlv_put(msg, OSMO_GSUP_IMSI_IE, bcd_len - 1, &bcd_buf[1]);
+
+ /* specific parts */
+ if (gsup_msg->msisdn_enc)
+ msgb_tlv_put(msg, OSMO_GSUP_MSISDN_IE,
+ gsup_msg->msisdn_enc_len, gsup_msg->msisdn_enc);
+ if (gsup_msg->hlr_enc)
+ msgb_tlv_put(msg, OSMO_GSUP_HLR_NUMBER_IE,
+ gsup_msg->hlr_enc_len, gsup_msg->hlr_enc);
+
+ if ((u8 = gsup_msg->cause))
+ msgb_tlv_put(msg, OSMO_GSUP_CAUSE_IE, sizeof(u8), &u8);
+
+ if ((u8 = gsup_msg->cancel_type)) {
+ u8 -= 1;
+ msgb_tlv_put(msg, OSMO_GSUP_CANCEL_TYPE_IE, sizeof(u8), &u8);
+ }
+
+ if (gsup_msg->pdp_info_compl)
+ msgb_tlv_put(msg, OSMO_GSUP_PDP_INFO_COMPL_IE, 0, &u8);
+
+ if (gsup_msg->freeze_ptmsi)
+ msgb_tlv_put(msg, OSMO_GSUP_FREEZE_PTMSI_IE, 0, &u8);
+
+ for (idx = 0; idx < gsup_msg->num_pdp_infos; idx++) {
+ const struct osmo_gsup_pdp_info *pdp_info;
+
+ pdp_info = &gsup_msg->pdp_infos[idx];
+
+ if (pdp_info->context_id == 0)
+ continue;
+
+ if (pdp_info->have_info) {
+ encode_pdp_info(msg, OSMO_GSUP_PDP_INFO_IE, pdp_info);
+ } else {
+ u8 = pdp_info->context_id;
+ msgb_tlv_put(msg, OSMO_GSUP_PDP_CONTEXT_ID_IE,
+ sizeof(u8), &u8);
+ }
+ }
+
+ for (idx = 0; idx < gsup_msg->num_auth_vectors; idx++) {
+ const struct osmo_auth_vector *auth_vector;
+
+ auth_vector = &gsup_msg->auth_vectors[idx];
+
+ encode_auth_info(msg, OSMO_GSUP_AUTH_TUPLE_IE, auth_vector);
+ }
+
+ if (gsup_msg->auts)
+ msgb_tlv_put(msg, OSMO_GSUP_AUTS_IE, 16, gsup_msg->auts);
+}