osmocom
/
libosmocore
mirror of https://gerrit.osmocom.org/libosmocore
11
0
Fork 0
Code Issues Releases Wiki Activity
libosmocore/src/gb/gprs_ns2_message.c

863 lines
25 KiB
C
Raw Blame History

/*! \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)
{
unsigned int bytes = msgb_length(msg);
int rc;
rc = nsvc->bind->send_vc(nsvc, msg);
if (rc < 0) {
RATE_CTR_INC_NS(nsvc, NS_CTR_PKTS_OUT_DROP);
RATE_CTR_ADD_NS(nsvc, NS_CTR_BYTES_OUT_DROP, bytes);
} else {
RATE_CTR_INC_NS(nsvc, NS_CTR_PKTS_OUT);
RATE_CTR_ADD_NS(nsvc, NS_CTR_BYTES_OUT, bytes);
}
return rc;
}
/* 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);
}
View Git Blame Copy Permalink