| /*! \file gprs_ns2_message.c |
| * NS-over-FR-over-GRE implementation. |
| * GPRS Networks Service (NS) messages on the Gb interface. |
| * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) |
| * as well as its successor 3GPP TS 48.016 */ |
| |
| /* (C) 2020 sysmocom - s.f.m.c. GmbH |
| * Author: Alexander Couzens <lynxis@fe80.eu> |
| * |
| * All Rights Reserved |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <errno.h> |
| |
| #include <osmocom/core/byteswap.h> |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/core/stat_item.h> |
| #include <osmocom/core/stats.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/gprs/gprs_msgb.h> |
| #include <osmocom/gprs/gprs_ns2.h> |
| #include <osmocom/gprs/protocol/gsm_08_16.h> |
| |
| #include "gprs_ns2_internal.h" |
| |
| #define ERR_IF_NSVC_USES_SNS(nsvc, reason) \ |
| do { \ |
| if (!nsvc->nse->bss_sns_fi) \ |
| break; \ |
| LOGNSVC(nsvc, LOGL_DEBUG, "invalid packet %s with SNS\n", reason); \ |
| } while (0) |
| |
| static int ns2_validate_reset(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
| { |
| if (!TLVP_PRES_LEN(tp, NS_IE_CAUSE, 1) || |
| !TLVP_PRES_LEN(tp, NS_IE_VCI, 2) || !TLVP_PRES_LEN(tp, NS_IE_NSEI, 2)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int ns2_validate_reset_ack(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
| { |
| if (!TLVP_PRES_LEN(tp, NS_IE_VCI, 2) || !TLVP_PRES_LEN(tp, NS_IE_NSEI, 2)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int ns2_validate_block(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
| { |
| if (!TLVP_PRES_LEN(tp, NS_IE_VCI, 2) || !TLVP_PRES_LEN(tp, NS_IE_CAUSE, 1)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int ns2_validate_block_ack(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
| { |
| if (!TLVP_PRES_LEN(tp, NS_IE_VCI, 2)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int ns2_validate_status(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
| { |
| |
| if (!TLVP_PRES_LEN(tp, NS_IE_CAUSE, 1)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| |
| uint8_t _cause = tlvp_val8(tp, NS_IE_CAUSE, 0); |
| switch (_cause) { |
| case NS_CAUSE_NSVC_BLOCKED: |
| case NS_CAUSE_NSVC_UNKNOWN: |
| if (!TLVP_PRES_LEN(tp, NS_IE_VCI, 1)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| |
| if (nsvc->mode != GPRS_NS2_VC_MODE_BLOCKRESET) { |
| *cause = NS_CAUSE_PDU_INCOMP_PSTATE; |
| return -1; |
| } |
| break; |
| case NS_CAUSE_SEM_INCORR_PDU: |
| case NS_CAUSE_PDU_INCOMP_PSTATE: |
| case NS_CAUSE_PROTO_ERR_UNSPEC: |
| case NS_CAUSE_INVAL_ESSENT_IE: |
| case NS_CAUSE_MISSING_ESSENT_IE: |
| if (!TLVP_PRES_LEN(tp, NS_IE_PDU, 1)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| break; |
| case NS_CAUSE_BVCI_UNKNOWN: |
| if (!TLVP_PRES_LEN(tp, NS_IE_BVCI, 2)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| break; |
| case NS_CAUSE_UNKN_IP_TEST_FAILED: |
| if (!TLVP_PRESENT(tp, NS_IE_IPv4_LIST) && !TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| return -1; |
| } |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int ns2_validate(struct gprs_ns2_vc *nsvc, |
| uint8_t pdu_type, |
| struct msgb *msg, |
| struct tlv_parsed *tp, |
| uint8_t *cause) |
| { |
| switch (pdu_type) { |
| case NS_PDUT_RESET: |
| return ns2_validate_reset(nsvc, msg, tp, cause); |
| case NS_PDUT_RESET_ACK: |
| return ns2_validate_reset_ack(nsvc, msg, tp, cause); |
| case NS_PDUT_BLOCK: |
| return ns2_validate_block(nsvc, msg, tp, cause); |
| case NS_PDUT_BLOCK_ACK: |
| return ns2_validate_block_ack(nsvc, msg, tp, cause); |
| case NS_PDUT_STATUS: |
| return ns2_validate_status(nsvc, msg, tp, cause); |
| |
| /* following PDUs doesn't have any payloads */ |
| case NS_PDUT_ALIVE: |
| case NS_PDUT_ALIVE_ACK: |
| case NS_PDUT_UNBLOCK: |
| case NS_PDUT_UNBLOCK_ACK: |
| if (msgb_l2len(msg) != sizeof(struct gprs_ns_hdr)) { |
| *cause = NS_CAUSE_PROTO_ERR_UNSPEC; |
| return -1; |
| } |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int ns_vc_tx(struct gprs_ns2_vc *nsvc, struct msgb *msg) |
| { |
| return nsvc->bind->send_vc(nsvc, msg); |
| } |
| |
| /* transmit functions */ |
| static int ns2_tx_simple(struct gprs_ns2_vc *nsvc, uint8_t pdu_type) |
| { |
| struct msgb *msg = ns2_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = pdu_type; |
| |
| LOG_NS_TX_SIGNAL(nsvc, nsh->pdu_type); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-BLOCK on a given NS-VC. |
| * \param[in] vc NS-VC on which the NS-BLOCK is to be transmitted |
| * \param[in] cause Numeric NS Cause value |
| * \param[in] nsvci if given this NSVCI will be encoded. If NULL the nsvc->nsvci will be used. |
| * \returns 0 in case of success */ |
| int ns2_tx_block(struct gprs_ns2_vc *nsvc, uint8_t cause, uint16_t *nsvci) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t encoded_nsvci; |
| |
| if (nsvci) |
| encoded_nsvci = osmo_htons(*nsvci); |
| else |
| encoded_nsvci = osmo_htons(nsvc->nsvci); |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS BLOCK"); |
| |
| msg = ns2_msgb_alloc(); |
| if (!msg) |
| return -ENOMEM; |
| |
| rate_ctr_inc(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_BLOCKED)); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = NS_PDUT_BLOCK; |
| |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &encoded_nsvci); |
| |
| LOG_NS_SIGNAL(nsvc, "Tx", nsh->pdu_type, LOGL_INFO, " cause=%s\n", gprs_ns2_cause_str(cause)); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-BLOCK-ACK on a given NS-VC. |
| * \param[in] nsvc NS-VC on which the NS-BLOCK is to be transmitted |
| * \param[in] nsvci if given this NSVCI will be encoded. If NULL the nsvc->nsvci will be used. |
| * \returns 0 in case of success */ |
| int ns2_tx_block_ack(struct gprs_ns2_vc *nsvc, uint16_t *nsvci) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t encoded_nsvci; |
| |
| if (nsvci) |
| encoded_nsvci = osmo_htons(*nsvci); |
| else |
| encoded_nsvci = osmo_htons(nsvc->nsvci); |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS BLOCK ACK"); |
| |
| msg = ns2_msgb_alloc(); |
| if (!msg) |
| return -ENOMEM; |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = NS_PDUT_BLOCK_ACK; |
| |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &encoded_nsvci); |
| |
| LOG_NS_TX_SIGNAL(nsvc, nsh->pdu_type); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-RESET on a given NS-VC. |
| * \param[in] nsvc NS-VC used for transmission |
| * \param[in] cause Numeric NS cause value |
| * \returns 0 in case of success */ |
| int ns2_tx_reset(struct gprs_ns2_vc *nsvc, uint8_t cause) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| uint16_t nsei = osmo_htons(nsvc->nse->nsei); |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS RESET"); |
| |
| msg = ns2_msgb_alloc(); |
| if (!msg) |
| return -ENOMEM; |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = NS_PDUT_RESET; |
| |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *) &nsei); |
| |
| LOG_NS_SIGNAL(nsvc, "Tx", nsh->pdu_type, LOGL_INFO, " cause=%s\n", gprs_ns2_cause_str(cause)); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-RESET-ACK on a given NS-VC. |
| * \param[in] nsvc NS-VC used for transmission |
| * \returns 0 in case of success */ |
| int ns2_tx_reset_ack(struct gprs_ns2_vc *nsvc) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsvci, nsei; |
| |
| /* Section 9.2.6 */ |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS RESET ACK"); |
| |
| msg = ns2_msgb_alloc(); |
| if (!msg) |
| return -ENOMEM; |
| |
| nsvci = osmo_htons(nsvc->nsvci); |
| nsei = osmo_htons(nsvc->nse->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = NS_PDUT_RESET_ACK; |
| |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci); |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| |
| LOG_NS_TX_SIGNAL(nsvc, nsh->pdu_type); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-UNBLOCK on a given NS-VC. |
| * \param[in] nsvc NS-VC on which the NS-UNBLOCK is to be transmitted |
| * \returns 0 in case of success */ |
| int ns2_tx_unblock(struct gprs_ns2_vc *nsvc) |
| { |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS UNBLOCK"); |
| |
| return ns2_tx_simple(nsvc, NS_PDUT_UNBLOCK); |
| } |
| |
| |
| /*! Transmit a NS-UNBLOCK-ACK on a given NS-VC. |
| * \param[in] nsvc NS-VC on which the NS-UNBLOCK-ACK is to be transmitted |
| * \returns 0 in case of success */ |
| int ns2_tx_unblock_ack(struct gprs_ns2_vc *nsvc) |
| { |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS UNBLOCK ACK"); |
| |
| return ns2_tx_simple(nsvc, NS_PDUT_UNBLOCK_ACK); |
| } |
| |
| /*! Transmit a NS-ALIVE on a given NS-VC. |
| * \param[in] nsvc NS-VC on which the NS-ALIVE is to be transmitted |
| * \returns 0 in case of success */ |
| int ns2_tx_alive(struct gprs_ns2_vc *nsvc) |
| { |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| return ns2_tx_simple(nsvc, NS_PDUT_ALIVE); |
| } |
| |
| /*! Transmit a NS-ALIVE-ACK on a given NS-VC. |
| * \param[in] nsvc NS-VC on which the NS-ALIVE-ACK is to be transmitted |
| * \returns 0 in case of success */ |
| int ns2_tx_alive_ack(struct gprs_ns2_vc *nsvc) |
| { |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| return ns2_tx_simple(nsvc, NS_PDUT_ALIVE_ACK); |
| } |
| |
| /*! Transmit NS-UNITDATA on a given NS-VC. |
| * \param[in] nsvc NS-VC on which the NS-UNITDATA is to be transmitted |
| * \param[in] bvci BVCI to encode in NS-UNITDATA header |
| * \param[in] sducontrol SDU control octet of NS header |
| * \param[in] msg message buffer containing payload |
| * \returns 0 in case of success */ |
| int ns2_tx_unit_data(struct gprs_ns2_vc *nsvc, |
| uint16_t bvci, uint8_t sducontrol, |
| struct msgb *msg) |
| { |
| struct gprs_ns_hdr *nsh; |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| msg->l2h = msgb_push(msg, sizeof(*nsh) + 3); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| if (!nsh) { |
| LOGNSVC(nsvc, LOGL_ERROR, "Not enough headroom for NS header\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsh->pdu_type = NS_PDUT_UNITDATA; |
| nsh->data[0] = sducontrol; |
| nsh->data[1] = bvci >> 8; |
| nsh->data[2] = bvci & 0xff; |
| |
| LOG_NS_DATA(nsvc, "Tx", nsh->pdu_type, LOGL_INFO, "\n"); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-STATUS on a given NS-VC. |
| * \param[in] nsvc NS-VC to be used for transmission |
| * \param[in] cause Numeric NS cause value |
| * \param[in] bvci BVCI to be reset within NSVC |
| * \param[in] orig_msg message causing the STATUS |
| * \param[in] nsvci if given this NSVCI will be encoded. If NULL the nsvc->nsvci will be used. |
| * \returns 0 in case of success */ |
| int ns2_tx_status(struct gprs_ns2_vc *nsvc, uint8_t cause, |
| uint16_t bvci, struct msgb *orig_msg, uint16_t *nsvci) |
| { |
| struct msgb *msg = ns2_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| uint16_t encoded_nsvci; |
| unsigned int orig_len, max_orig_len; |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| bvci = osmo_htons(bvci); |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = NS_PDUT_STATUS; |
| |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| |
| switch (cause) { |
| case NS_CAUSE_NSVC_BLOCKED: |
| case NS_CAUSE_NSVC_UNKNOWN: |
| /* Section 9.2.7.1: Static conditions for NS-VCI */ |
| if (nsvci) |
| encoded_nsvci = osmo_htons(*nsvci); |
| else |
| encoded_nsvci = osmo_htons(nsvc->nsvci); |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&encoded_nsvci); |
| break; |
| case NS_CAUSE_SEM_INCORR_PDU: |
| case NS_CAUSE_PDU_INCOMP_PSTATE: |
| case NS_CAUSE_PROTO_ERR_UNSPEC: |
| case NS_CAUSE_INVAL_ESSENT_IE: |
| case NS_CAUSE_MISSING_ESSENT_IE: |
| /* Section 9.2.7.2: Static conditions for NS PDU */ |
| /* ensure the PDU doesn't exceed the MTU */ |
| orig_len = msgb_l2len(orig_msg); |
| max_orig_len = msgb_length(msg) + TVLV_GROSS_LEN(orig_len); |
| if (max_orig_len > nsvc->bind->mtu) |
| orig_len -= max_orig_len - nsvc->bind->mtu; |
| msgb_tvlv_put(msg, NS_IE_PDU, orig_len, orig_msg->l2h); |
| break; |
| case NS_CAUSE_BVCI_UNKNOWN: |
| /* Section 9.2.7.3: Static conditions for BVCI */ |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&bvci); |
| break; |
| |
| default: |
| break; |
| } |
| |
| LOG_NS_SIGNAL(nsvc, "Tx", nsh->pdu_type, LOGL_INFO, " cause=%s\n", gprs_ns2_cause_str(cause)); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-ADD/SNS-CHANGE-WEIGHT as per Section 9.3.2/9.3.3. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG |
| * \param[in] pdu The PDU type to send out |
| * \param[in] trans_id The transaction id |
| * \param[in] ip4_elems Array of IPv4 Elements |
| * \param[in] num_ip4_elems number of ip4_elems |
| * \param[in] ip6_elems Array of IPv6 Elements |
| * \param[in] num_ip6_elems number of ip6_elems |
| * \returns 0 on success; negative in case of error */ |
| static int ns2_tx_sns_procedure(struct gprs_ns2_vc *nsvc, |
| enum ns_pdu_type pdu, |
| uint8_t trans_id, |
| const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| unsigned int num_ip4_elems, |
| const struct gprs_ns_ie_ip6_elem *ip6_elems, |
| unsigned int num_ip6_elems) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| if (!nsvc) |
| return -EINVAL; |
| |
| if (!ip4_elems && !ip6_elems) |
| return -EINVAL; |
| |
| msg = ns2_msgb_alloc(); |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nse->bss_sns_fi) { |
| LOGNSVC(nsvc, LOGL_ERROR, "Cannot transmit SNS on NSVC without SNS active\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nse->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = pdu; |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| msgb_v_put(msg, trans_id); |
| |
| /* List of IP4 Elements 10.3.2c */ |
| if (ip4_elems) { |
| msgb_tvlv_put(msg, NS_IE_IPv4_LIST, num_ip4_elems*sizeof(struct gprs_ns_ie_ip4_elem), |
| (const uint8_t *)ip4_elems); |
| } else if (ip6_elems) { |
| /* List of IP6 elements 10.3.2d */ |
| msgb_tvlv_put(msg, NS_IE_IPv6_LIST, num_ip6_elems*sizeof(struct gprs_ns_ie_ip6_elem), |
| (const uint8_t *)ip6_elems); |
| } |
| |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-ADD as per Section 9.3.2. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG |
| * \param[in] trans_id The transaction id |
| * \param[in] ip4_elems Array of IPv4 Elements |
| * \param[in] num_ip4_elems number of ip4_elems |
| * \param[in] ip6_elems Array of IPv6 Elements |
| * \param[in] num_ip6_elems number of ip6_elems |
| * \returns 0 on success; negative in case of error */ |
| int ns2_tx_sns_add(struct gprs_ns2_vc *nsvc, |
| uint8_t trans_id, |
| const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| unsigned int num_ip4_elems, |
| const struct gprs_ns_ie_ip6_elem *ip6_elems, |
| unsigned int num_ip6_elems) |
| { |
| return ns2_tx_sns_procedure(nsvc, SNS_PDUT_ADD, trans_id, ip4_elems, num_ip4_elems, ip6_elems, num_ip6_elems); |
| } |
| |
| /*! Encode + Transmit a SNS-CHANGE-WEIGHT as per Section 9.3.3. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG |
| * \param[in] trans_id The transaction id |
| * \param[in] ip4_elems Array of IPv4 Elements |
| * \param[in] num_ip4_elems number of ip4_elems |
| * \param[in] ip6_elems Array of IPv6 Elements |
| * \param[in] num_ip6_elems number of ip6_elems |
| * \returns 0 on success; negative in case of error */ |
| int ns2_tx_sns_change_weight(struct gprs_ns2_vc *nsvc, |
| uint8_t trans_id, |
| const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| unsigned int num_ip4_elems, |
| const struct gprs_ns_ie_ip6_elem *ip6_elems, |
| unsigned int num_ip6_elems) |
| { |
| return ns2_tx_sns_procedure(nsvc, SNS_PDUT_CHANGE_WEIGHT, trans_id, ip4_elems, num_ip4_elems, ip6_elems, num_ip6_elems); |
| } |
| |
| /*! Encode + Transmit a SNS-DEL as per Section 9.3.6. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG |
| * \param[in] trans_id The transaction id |
| * \param[in] ip4_elems Array of IPv4 Elements |
| * \param[in] num_ip4_elems number of ip4_elems |
| * \param[in] ip6_elems Array of IPv6 Elements |
| * \param[in] num_ip6_elems number of ip6_elems |
| * \returns 0 on success; negative in case of error */ |
| int ns2_tx_sns_del(struct gprs_ns2_vc *nsvc, |
| uint8_t trans_id, |
| const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| unsigned int num_ip4_elems, |
| const struct gprs_ns_ie_ip6_elem *ip6_elems, |
| unsigned int num_ip6_elems) |
| { |
| /* TODO: IP Address field */ |
| return ns2_tx_sns_procedure(nsvc, SNS_PDUT_DELETE, trans_id, ip4_elems, num_ip4_elems, ip6_elems, num_ip6_elems); |
| } |
| |
| |
| /*! Encode + Transmit a SNS-ACK as per Section 9.3.1. |
| * \param[in] nsvc NS-VC through which to transmit the ACK |
| * \param[in] trans_id Transaction ID which to acknowledge |
| * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| * \param[in] ip4_elems Array of IPv4 Elements |
| * \param[in] num_ip4_elems number of ip4_elems |
| * \returns 0 on success; negative in case of error */ |
| int ns2_tx_sns_ack(struct gprs_ns2_vc *nsvc, uint8_t trans_id, uint8_t *cause, |
| const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| unsigned int num_ip4_elems, |
| const struct gprs_ns_ie_ip6_elem *ip6_elems, |
| unsigned int num_ip6_elems) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| if (!nsvc) |
| return -1; |
| |
| msg = ns2_msgb_alloc(); |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nse->bss_sns_fi) { |
| LOGNSVC(nsvc, LOGL_ERROR, "Cannot transmit SNS on NSVC without SNS active\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| |
| nsei = osmo_htons(nsvc->nse->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_ACK; |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| msgb_v_put(msg, trans_id); |
| if (cause) |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| if (ip4_elems) { |
| /* List of IP4 Elements 10.3.2c */ |
| msgb_tvlv_put(msg, NS_IE_IPv4_LIST, |
| num_ip4_elems*sizeof(struct gprs_ns_ie_ip4_elem), |
| (const uint8_t *)ip4_elems); |
| } |
| if (ip6_elems) { |
| /* List of IP6 elements 10.3.2d */ |
| msgb_tvlv_put(msg, NS_IE_IPv6_LIST, |
| num_ip6_elems*sizeof(struct gprs_ns_ie_ip6_elem), |
| (const uint8_t *)ip6_elems); |
| } |
| |
| LOG_NS_SIGNAL(nsvc, "Tx", nsh->pdu_type, LOGL_INFO, |
| " (trans_id=%u, cause=%s, num_ip4=%u, num_ip6=%u)\n", |
| trans_id, cause ? gprs_ns2_cause_str(*cause) : "NULL", num_ip4_elems, num_ip6_elems); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-CONFIG as per Section 9.3.4. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG |
| * \param[in] end_flag Whether or not this is the last SNS-CONFIG |
| * \param[in] ip4_elems Array of IPv4 Elements |
| * \param[in] num_ip4_elems number of ip4_elems |
| * \returns 0 on success; negative in case of error */ |
| int ns2_tx_sns_config(struct gprs_ns2_vc *nsvc, bool end_flag, |
| const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| unsigned int num_ip4_elems, |
| const struct gprs_ns_ie_ip6_elem *ip6_elems, |
| unsigned int num_ip6_elems) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| if (!nsvc) |
| return -1; |
| |
| msg = ns2_msgb_alloc(); |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nse->bss_sns_fi) { |
| LOGNSVC(nsvc, LOGL_ERROR, "Cannot transmit SNS on NSVC without SNS active\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nse->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_CONFIG; |
| |
| msgb_v_put(msg, end_flag ? 0x01 : 0x00); |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| |
| /* List of IP4 Elements 10.3.2c */ |
| if (ip4_elems) { |
| msgb_tvlv_put(msg, NS_IE_IPv4_LIST, num_ip4_elems*sizeof(struct gprs_ns_ie_ip4_elem), |
| (const uint8_t *)ip4_elems); |
| } else if (ip6_elems) { |
| /* List of IP6 elements 10.3.2d */ |
| msgb_tvlv_put(msg, NS_IE_IPv6_LIST, num_ip6_elems*sizeof(struct gprs_ns_ie_ip6_elem), |
| (const uint8_t *)ip6_elems); |
| } |
| |
| LOG_NS_SIGNAL(nsvc, "Tx", nsh->pdu_type, LOGL_INFO, |
| " (end_flag=%u, num_ip4=%u, num_ip6=%u)\n", |
| end_flag, num_ip4_elems, num_ip6_elems); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-CONFIG-ACK as per Section 9.3.5. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG-ACK |
| * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| * \returns 0 on success; negative in case of error */ |
| int ns2_tx_sns_config_ack(struct gprs_ns2_vc *nsvc, uint8_t *cause) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| if (!nsvc) |
| return -1; |
| |
| msg = ns2_msgb_alloc(); |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nse->bss_sns_fi) { |
| LOGNSVC(nsvc, LOGL_ERROR, "Cannot transmit SNS on NSVC without SNS active\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nse->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_CONFIG_ACK; |
| |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| if (cause) |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| |
| LOGNSVC(nsvc, LOGL_INFO, "Tx SNS-CONFIG-ACK (cause=%s)\n", |
| cause ? gprs_ns2_cause_str(*cause) : "NULL"); |
| LOG_NS_TX_SIGNAL(nsvc, nsh->pdu_type); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| |
| /*! Encode + transmit a SNS-SIZE as per Section 9.3.7. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-SIZE |
| * \param[in] reset_flag Whether or not to add a RESET flag |
| * \param[in] max_nr_nsvc Maximum number of NS-VCs |
| * \param[in] ip4_ep_nr Number of IPv4 endpoints (< 0 will omit the TLV) |
| * \param[in] ip6_ep_nr Number of IPv6 endpoints (< 0 will omit the TLV) |
| * \returns 0 on success; negative in case of error */ |
| int ns2_tx_sns_size(struct gprs_ns2_vc *nsvc, bool reset_flag, uint16_t max_nr_nsvc, |
| int ip4_ep_nr, int ip6_ep_nr) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| if (!nsvc) |
| return -1; |
| |
| msg = ns2_msgb_alloc(); |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nse->bss_sns_fi) { |
| LOGNSVC(nsvc, LOGL_ERROR, "Cannot transmit SNS on NSVC without SNS active\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nse->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_SIZE; |
| |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| msgb_tv_put(msg, NS_IE_RESET_FLAG, reset_flag ? 0x01 : 0x00); |
| msgb_tv16_put(msg, NS_IE_MAX_NR_NSVC, max_nr_nsvc); |
| if (ip4_ep_nr >= 0) |
| msgb_tv16_put(msg, NS_IE_IPv4_EP_NR, ip4_ep_nr); |
| if (ip6_ep_nr >= 0) |
| msgb_tv16_put(msg, NS_IE_IPv6_EP_NR, ip6_ep_nr); |
| |
| LOG_NS_SIGNAL(nsvc, "Tx", nsh->pdu_type, LOGL_INFO, |
| " (reset=%u, max_nr_nsvc=%u, num_ip4=%d, num_ip6=%d)\n", |
| reset_flag, max_nr_nsvc, ip4_ep_nr, ip6_ep_nr); |
| return ns_vc_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-SIZE-ACK as per Section 9.3.8. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-SIZE-ACK |
| * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| * \returns 0 on success; negative in case of error */ |
| int ns2_tx_sns_size_ack(struct gprs_ns2_vc *nsvc, uint8_t *cause) |
| { |
| struct msgb *msg = ns2_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nse->bss_sns_fi) { |
| LOGNSVC(nsvc, LOGL_ERROR, "Cannot transmit SNS on NSVC without SNS active\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nse->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_SIZE_ACK; |
| |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| if (cause) |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| |
| LOG_NS_SIGNAL(nsvc, "Tx", nsh->pdu_type, LOGL_INFO, " cause=%s\n", |
| cause ? gprs_ns2_cause_str(*cause) : "NULL"); |
| return ns_vc_tx(nsvc, msg); |
| } |