132 lines
4.2 KiB
C
132 lines
4.2 KiB
C
/* SM PDUs, 3GPP TS 9.5 24.008 Session Management Messages */
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/* (C) 2023 by Sysmocom s.f.m.c. GmbH
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdint.h>
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#include <errno.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/bitvec.h>
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#include <osmocom/core/endian.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>
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#include <osmocom/gsm/apn.h>
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#include <osmocom/gprs/sm/sm_private.h>
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#include <osmocom/gprs/sm/sm_pdu.h>
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const struct tlv_definition gprs_sm_att_tlvdef = {
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.def = {
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[GSM48_IE_GSM_RADIO_PRIO] = {TLV_TYPE_SINGLE_TV, 1 },
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[GSM48_IE_GSM_APN] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_PROTO_CONF_OPT] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_PDP_ADDR] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_AA_TMR] = { TLV_TYPE_TV, 1 },
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[GSM48_IE_GSM_QOS] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_TFT] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_LLC_SAPI] = { TLV_TYPE_TV, 1 },
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[GSM48_IE_GSM_PFI] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_NAME_FULL] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_NAME_SHORT] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_TIMEZONE] = { TLV_TYPE_FIXED, 1 },
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[GSM48_IE_GSM_UTC_AND_TZ] = { TLV_TYPE_FIXED, 7 },
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[GSM48_IE_GSM_LSA_ID] = { TLV_TYPE_TLV, 0 },
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},
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};
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/* 10.5.6.4 Packet data protocol address */
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static uint8_t gprs_sm_pdp_addr_enc_ietf(struct gprs_sm_pdp_addr *out,
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enum osmo_gprs_sm_pdp_addr_ietf_type pdp_addr_ietf_type,
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const struct osmo_sockaddr *pdp_addr_v4,
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const struct osmo_sockaddr *pdp_addr_v6)
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{
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memset(out, 0, sizeof(*out));
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out->spare = 0x00;
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out->organization = GPRS_SM_PDP_ADDR_ORG_IETF;
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out->type = pdp_addr_ietf_type;
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switch (pdp_addr_ietf_type) {
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case OSMO_GPRS_SM_PDP_ADDR_IETF_IPV6:
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memcpy(out->addr6, pdp_addr_v6->u.sin6.sin6_addr.s6_addr, sizeof(out->addr6));
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return 2 + sizeof(out->addr6);
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case OSMO_GPRS_SM_PDP_ADDR_IETF_IPV4V6:
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out->both.addr = pdp_addr_v4->u.sin.sin_addr.s_addr;
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memcpy(out->both.addr6, pdp_addr_v6->u.sin6.sin6_addr.s6_addr, sizeof(out->both.addr6));
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return 2 + sizeof(out->both.addr) + sizeof(out->both.addr6);
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case OSMO_GPRS_SM_PDP_ADDR_IETF_IPV4:
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default:
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/* All other values shall be interpreted as IPv4 address in this version of the protocol */
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out->addr = pdp_addr_v4->u.sin.sin_addr.s_addr;
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return 2 + sizeof(out->both.addr);
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}
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}
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/* Chapter 9.4.1: Attach request */
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int gprs_sm_build_act_pdp_ctx_req(struct gprs_sm_entity *sme,
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struct msgb *msg)
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{
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struct gsm48_hdr *gh;
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uint8_t *l;
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int rc;
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uint8_t transaction_id = sme->ti ^ 0x8; /* flip */
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
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gh->msg_type = GSM48_MT_GSM_ACT_PDP_REQ;
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/* 10.5.6.2 Requested NSAPI */
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msgb_v_put(msg, sme->nsapi);
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/* 10.5.6.9 Requested LLC SAPI */
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msgb_v_put(msg, sme->llc_sapi);
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/* 10.5.6.5 Requested QoS */
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msgb_lv_put(msg, sme->qos_len, (uint8_t *)&sme->qos);
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/* 10.5.6.4 Requested PDP address */
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l = msgb_put(msg, 1); /* len */
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*l = gprs_sm_pdp_addr_enc_ietf((struct gprs_sm_pdp_addr *)msg->tail,
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sme->pdp_addr_ietf_type,
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&sme->pdp_addr_v4,
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&sme->pdp_addr_v6);
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msgb_put(msg, *l);
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/* 10.5.6.1 Access point name (Optional) */
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if (sme->apn[0] != '\0') {
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msgb_v_put(msg, GSM48_IE_GSM_APN);
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l = msgb_put(msg, 1); /* len */
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rc = osmo_apn_from_str(msg->tail, msgb_tailroom(msg), sme->apn);
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if (rc < 0)
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return -EINVAL;
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*l = rc;
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}
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/* 10.5.6.3 Protocol configuration options (Optional) */
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if (sme->pco_len > 0)
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msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT,
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sme->pco_len, sme->pco);
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/* TODO: other optional fields */
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return 0;
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}
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