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HACK; e1d-fr-test 

Change-Id: I31486c77609398093cc535eeafb20be9e95d8b03
This commit is contained in:
Harald Welte 2020-07-12 23:39:22 +02:00
parent a94bb7761f
commit 5f9d63fe1e
6 changed files with 811 additions and 0 deletions
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1
configure.ac
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@ -34,6 +34,7 @@ PKG_CHECK_MODULES(TALLOC, [talloc >= 2.0.1])
PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.0.1.120)
PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty)
PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm)
PKG_CHECK_MODULES(LIBOSMOUSB, libosmousb)
PKG_CHECK_MODULES(LIBUSB, libusb-1.0 >= 1.0.21)

3
contrib/e1-prbs-test/main.c
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@ -36,6 +36,7 @@
#include <dahdi/user.h>
#include <osmocom/core/select.h>
#include <osmocom/core/application.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/bits.h>
#include <osmocom/core/prbs.h>
@ -239,6 +240,8 @@ int main(int argc, char **argv)
char *basedir;
int rc;
osmo_init_logging2(NULL, NULL);
handle_options(argc, argv);
if (argc <= optind) {

9
src/Makefile.am
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@ -22,12 +22,14 @@ libosmo_e1d_la_LIBADD = $(LIBOSMOCORE_LIBS)
noinst_HEADERS = \
e1d.h \
log.h \
frame_relay.h \
$(NULL)
bin_PROGRAMS = \
osmo-e1d \
osmo-e1d-pipe \
e1d-fr-test \
$(NULL)
osmo_e1d_SOURCES = \
@ -48,3 +50,10 @@ osmo_e1d_pipe_SOURCES = \
$(NULL)
osmo_e1d_pipe_LDADD = $(LIBOSMOCORE_LIBS) libosmo-e1d.la
e1d_fr_test_SOURCES = \
e1d-fr-test.c \
frame_relay.c \
$(NULL)
e1d_fr_test_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) libosmo-e1d.la

214
src/e1d-fr-test.c Normal file
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@ -0,0 +1,214 @@
/* osmo-e1d client program implementing Frame Relay / ITU-T Q.933 Annex A LMI
* This can be used to verify the new "superchannel" support in osmo-e1d for
* transporting (among other things) frame relay.
*
* (C) 2020 by Harald Welte <laforge@osmocom.org>
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/types.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/select.h>
#include <osmocom/core/application.h>
#include <osmocom/e1d/proto_clnt.h>
#include "frame_relay.h"
static void *g_ctx;
static struct osmo_e1dp_client *g_client;
static struct osmo_fd ts_ofd;
struct fr_link *g_link;
static int ts_open(uint8_t intf_nr, uint8_t line_nr, uint8_t ts_nr,
enum osmo_e1dp_ts_mode mode)
{
int rc = osmo_e1dp_client_ts_open(g_client, intf_nr, line_nr, ts_nr, mode, 1600);
if (rc < 0)
fprintf(stderr, "Cannot open e1d timeslot %u:%u:%u\n", intf_nr, line_nr, ts_nr);
return rc;
}
int fr_tx(struct msgb *msg)
{
int rc;
OSMO_ASSERT(g_link == msg->dst);
printf("Tx: %s\n", msgb_hexdump(msg));
rc = write(ts_ofd.fd, msgb_data(msg), msgb_length(msg));
if (rc != msgb_length(msg))
exit(23);
msgb_free(msg);
return rc;
}
static int dlc_rx_cb(struct fr_dlc *dlc, struct msgb *msg)
{
printf("Rx DLCI %u: %s\n", dlc->dlci, msgb_hexdump(msg));
msgb_free(msg);
return 0;
}
static int ts_fd_cb(struct osmo_fd *ofd, unsigned int what)
{
int rc;
if (what & OSMO_FD_READ) {
struct msgb *rx = msgb_alloc(1600, "E1 Rx");
rc = read(ofd->fd, msgb_data(rx), msgb_tailroom(rx));
if (rc < 0 && errno != EAGAIN)
exit(3);
else if (rc == 0)
exit(4);
else if (rc > 0) {
msgb_put(rx, rc);
printf("Rx: %s\n", msgb_hexdump(rx));
fr_rx(g_link, rx);
}
}
#if 0
if (what & OSMO_FD_WRITE) {
rc = read(infd, buf, sizeof(buf));
if (rc < 0 && errno != EAGAIN)
exit(4);
else if (rc == 0) { /* EOF */
rc = lseek(infd, 0, SEEK_SET);
if (rc < 0) {
perror("rewind input file");
exit(5);
}
} else if (rc > 0) {
count = rc;
rc = write(ofd->fd, buf, count);
if (rc < 0 && errno != EAGAIN)
exit(4);
}
}
#endif
return 0;
}
static void print_help(void)
{
printf(
" -h --help This help message\n"
" -p --path PATH Path of the osmo-e1d control socket\n"
" -i --interface <0-255> E1 Interface Number\n"
" -l --line <0-255> E1 Line Number\n"
" -t --timeslot <0-31> E1 Timeslot Number\n"
" -m --mode (RAW|HDLC-FCS) E1 Timeslot Mode\n"
" -r --read FILE Read from FILE instead of STDIN\n"
);
}
int main(int argc, char **argv)
{
int intf_nr = -1, line_nr = -1, ts_nr = -1;
char *path = E1DP_DEFAULT_SOCKET;
int tsfd;
int option_index;
g_ctx = talloc_named_const(NULL, 0, "g_ctx");
OSMO_ASSERT(g_ctx);
osmo_init_logging2(g_ctx, NULL);
/* FIXME: handle options */
while (1) {
int c;
static const struct option long_options[] = {
{ "help", 0, 0, 'h' },
{ "path", 1, 0, 'p' },
{ "interface", 1, 0, 'i' },
{ "line", 1, 0, 'l' },
{ "timeslot", 1, 0, 't' },
{ 0,0,0,0 }
};
c = getopt_long(argc, argv, "hp:i:l:t:m:r:", long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'h':
print_help();
exit(0);
case 'p':
path = optarg;
break;
case 'i':
intf_nr = atoi(optarg);
break;
case 'l':
line_nr = atoi(optarg);
break;
case 't':
ts_nr = atoi(optarg);
break;
}
}
if (intf_nr == -1 || line_nr == -1 || ts_nr == -1) {
fprintf(stderr, "You must at least specify interface, line and timeslot numbers\n");
exit(2);
}
g_client = osmo_e1dp_client_create(g_ctx, path);
if (!g_client) {
fprintf(stderr, "Cannot establish connection to osmo-e1d at %s\n", path);
exit(1);
}
tsfd = ts_open(intf_nr, line_nr, ts_nr, E1DP_TSMODE_HDLCFCS);
if (tsfd < 0)
exit(2);
int rc = osmo_e1dp_client_line_config(g_client, intf_nr, line_nr, E1DP_LMODE_SUPERCHANNEL);
if (rc != 0)
exit(3);
osmo_fd_setup(&ts_ofd, tsfd, OSMO_FD_READ/*|OSMO_FD_WRITE*/, ts_fd_cb, NULL, 0);
osmo_fd_register(&ts_ofd);
struct fr_network *net = fr_network_alloc(NULL);
g_link = fr_link_alloc(net);
struct fr_dlc *dlc = fr_dlc_alloc(g_link, 23);
dlc->rx_cb = dlc_rx_cb;
while (1) {
osmo_select_main(0);
}
}

511
src/frame_relay.c Normal file
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@ -0,0 +1,511 @@
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/tdef.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/tlv.h>
#include "frame_relay.h"
#define DFR DLGLOBAL
/* Table 4-2/Q.931 */
enum q931_msgtype {
/* Call establishment message */
Q931_MSGT_ALERTING = 0x01,
Q931_MSGT_CALL_PROCEEDING = 0x02,
Q931_MSGT_CONNECT = 0x07,
Q931_MSGT_CONNECT_ACK = 0x0f,
Q931_MSGT_PROGRESS = 0x03,
Q931_MSGT_SETUP = 0x05,
Q931_MSGT_SETUP_ACK = 0x0d,
/* Call information phase message */
Q931_MSGT_RESUME = 0x26,
Q931_MSGT_RESUME_ACK = 0x2e,
Q931_MSGT_RESUME_REJ = 0x22,
Q931_MSGT_SUSPEND = 0x25,
Q931_MSGT_SUSPEND_ACK = 0x2d,
Q931_MSGT_USER_INFO = 0x20,
/* Call clearing message */
Q931_MSGT_DISCONNECT = 0x45,
Q931_MSGT_RELEASE = 0x4d,
Q931_MSGT_RELEASE_COMPLETE = 0x5a,
Q931_MSGT_RESTART = 0x46,
Q931_MSGT_RESTART_ACK = 0x4e,
/* Miscellaneous messages */
Q931_MSGT_SEGMENT = 0x60,
Q931_MSGT_CONGESTION_CONTROL = 0x79,
Q931_MSGT_IFORMATION = 0x7b,
Q931_MSGT_NOTIFY = 0x6e,
Q931_MSGT_STATUS = 0x7d,
Q931_MSGT_STATUS_ENQUIRY = 0x75,
};
/* Figure A.1/Q.933 Report type information element */
enum q933_type_of_report {
Q933_REPT_FULL_STATUS = 0x00,
Q933_REPT_LINK_INTEGRITY_VERIF = 0x01,
Q933_REPT_SINGLE_PVC_ASYNC_STS = 0x02,
};
/* Q.933 Section A.3 */
enum q933_iei {
Q933_IEI_REPORT_TYPE = 0x51,
Q933_IEI_LINK_INT_VERIF = 0x53,
Q933_IEI_PVC_STATUS = 0x57,
};
#define LAPF_UI 0x03 /* UI control word */
#define Q931_PDISC_CC 0x08 /* protocol discriminator */
#define LMI_Q933A_CALLREF 0x00 /* NULL call-ref */
/* LMI DLCI values */
#define LMI_Q933A_DLCI 0 /* Q.933A DLCI */
#define LMI_CISCO_DLCI 1023 /* Cisco DLCI */
/* Message header of the L3 payload of a Q.933 Annex A message */
struct q933_a_hdr {
uint8_t prot_disc;
uint8_t call_ref;
uint8_t msg_type;
} __attribute__((packed));
/* Value part of the Q.933 Annex A.3.3 IE */
struct q933_a_pvc_sts {
uint8_t ext0:1,
spare:1,
dlci_msb:6;
uint8_t ext1:1,
dlci_lsb:4,
spare1:3;
uint8_t ext2:1,
spare2:3,
new:1,
delete:1,
active:1,
reserved:1;
} __attribute__((packed));
// RX Message: 14 [ 00 01 03 08 00 75 95 01 01 00 03 02 01 00 ]
// RX Message: 13 [ 00 01 03 08 00 75 51 01 00 53 02 01 00 ]
/* Table A.4/Q.933 */
struct osmo_tdef fr_tdefs[] = {
{
.T=391,
.default_val = 10,
.min_val = 5,
.max_val = 30,
.desc = "Link integrity verification polling timer"
}, {
.T=392,
.default_val = 15,
.min_val = 5,
.max_val = 30,
.desc = "Polling verification timer"
},
{}
};
static const struct tlv_definition q933_att_tlvdef = {
.def = {
[Q933_IEI_REPORT_TYPE] = { TLV_TYPE_TLV },
[Q933_IEI_LINK_INT_VERIF] = { TLV_TYPE_TLV },
[Q933_IEI_PVC_STATUS] = { TLV_TYPE_TLV },
},
};
static inline uint16_t q922_to_dlci(const uint8_t *hdr)
{
return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
}
static inline void dlci_to_q922(uint8_t *hdr, uint16_t dlci)
{
hdr[0] = (dlci >> 2) & 0xFC;
hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
}
/* allocate a message buffer and put Q.933 Annex A headers (L2 + L3) */
static struct msgb *q933_msgb_alloc(uint16_t dlci, uint8_t prot_disc, uint8_t msg_type)
{
struct msgb *msg = msgb_alloc_headroom(1600+64, 64, "FR Q.933 Tx");
struct q933_a_hdr *qh;
if (!msg)
return NULL;
msg->l1h = msgb_put(msg, 2);
dlci_to_q922(msg->l1h, dlci);
/* LAPF UI control */
msg->l2h = msgb_put(msg, 1);
*msg->l2h = LAPF_UI;
msg->l3h = msgb_put(msg, sizeof(*qh));
qh = (struct q933_a_hdr *) msg->l3h;
qh->prot_disc = prot_disc;
qh->call_ref = LMI_Q933A_CALLREF;
qh->msg_type = msg_type;
return msg;
}
/* obtain the [next] transmit sequence number */
static uint8_t fr_link_get_tx_seq(struct fr_link *link)
{
/* The {user equipment, network} increments the send sequence
* counter using modulo 256. The value zero is skipped. */
link->last_tx_seq++;
if (link->last_tx_seq == 0)
link->last_tx_seq++;
return link->last_tx_seq;
}
/* Append PVC Status IE according to Q.933 A.3.2 */
static void msgb_put_link_int_verif(struct msgb *msg, struct fr_link *link)
{
uint8_t link_int_tx[2];
link_int_tx[0] = fr_link_get_tx_seq(link);
link_int_tx[1] = link->last_rx_seq;
msgb_tlv_put(msg, Q933_IEI_LINK_INT_VERIF, 2, link_int_tx);
}
static void dlc_destroy(struct fr_dlc *dlc)
{
llist_del(&dlc->list);
talloc_free(dlc);
}
/* Append PVC Status IE according to Q.933 A.3.3 */
static void msgb_put_pvc_status(struct msgb *msg, struct fr_dlc *dlc)
{
uint8_t ie[3];
ie[0] = (dlc->dlci >> 4) & 0x3f;
ie[1] = 0x80 | ((dlc->dlci & 0xf) << 3);
ie[2] = 0x80;
if (dlc->active)
ie[2] |= 0x02;
if (dlc->new) {
ie[2] |= 0x08;
/* we've reported it as new once, reset the status */
dlc->new = false;
}
if (dlc->del) {
ie[2] |= 0x04;
/* we've reported it as deleted once, destroy it */
dlc_destroy(dlc);
}
msgb_tlv_put(msg, Q933_IEI_PVC_STATUS, 3, ie);
}
/* Send a Q.933 STATUS ENQUIRY given type over given link */
static int tx_lmi_q933_status_enq(struct fr_link *link, uint8_t rep_type)
{
struct msgb *resp;
resp = q933_msgb_alloc(0, Q931_PDISC_CC, Q931_MSGT_STATUS_ENQUIRY);
if (!resp)
return -1;
resp->dst = link;
/* Table A.2/Q.933 */
msgb_tlv_put(resp, Q933_IEI_REPORT_TYPE, 1, &rep_type);
msgb_put_link_int_verif(resp, link);
return fr_tx(resp);
}
/* Send a Q.933 STATUS of given type over given link */
static int tx_lmi_q933_status(struct fr_link *link, uint8_t rep_type)
{
struct fr_dlc *dlc, *dlc2;
struct msgb *resp;
resp = q933_msgb_alloc(0, Q931_PDISC_CC, Q931_MSGT_STATUS);
if (!resp)
return -1;
resp->dst = link;
/* Table A.1/Q.933 */
msgb_tlv_put(resp, Q933_IEI_REPORT_TYPE, 1, &rep_type);
switch (rep_type) {
case Q933_REPT_FULL_STATUS:
msgb_put_link_int_verif(resp, link);
llist_for_each_entry_safe(dlc, dlc2, &link->dlc_list, list)
msgb_put_pvc_status(resp, dlc);
break;
case Q933_REPT_LINK_INTEGRITY_VERIF:
msgb_put_link_int_verif(resp, link);
break;
case Q933_REPT_SINGLE_PVC_ASYNC_STS:
llist_for_each_entry_safe(dlc, dlc2, &link->dlc_list, list)
msgb_put_pvc_status(resp, dlc);
break;
}
return fr_tx(resp);
}
/* Q.933 */
static int rx_lmi_q933_status_enq(struct msgb *msg, struct tlv_parsed *tp)
{
struct fr_link *link = msg->dst;
const uint8_t *link_int_rx;
uint8_t rep_type;
/* check for mandatory IEs */
if (!TLVP_PRES_LEN(tp, Q933_IEI_REPORT_TYPE, 1) ||
!TLVP_PRES_LEN(tp, Q933_IEI_LINK_INT_VERIF, 2))
return -1;
rep_type = *TLVP_VAL(tp, Q933_IEI_REPORT_TYPE);
link_int_rx = TLVP_VAL(tp, Q933_IEI_LINK_INT_VERIF);
link->last_rx_seq = link_int_rx[0];
/* the network checks the receive sequence number received from
* the user equipment against its send sequence counter */
if (link_int_rx[1] != link->last_tx_seq)
link->err_count++;
/* The network responds to each STATUS ENQUIRY message with a
* STATUS message and resets the T392 timer */
osmo_timer_schedule(&link->t392, osmo_tdef_get(link->net->T_defs, 392, OSMO_TDEF_S, 15), 0);
return tx_lmi_q933_status(link, rep_type);
}
static int rx_lmi_q933_status(struct msgb *msg, struct tlv_parsed *tp)
{
struct fr_link *link = msg->dst;
const uint8_t *link_int_rx;
uint8_t rep_type;
/* check for mandatory IEs */
if (!TLVP_PRES_LEN(tp, Q933_IEI_REPORT_TYPE, 1))
return -1;
rep_type = *TLVP_VAL(tp, Q933_IEI_REPORT_TYPE);
switch (rep_type) {
case Q933_REPT_FULL_STATUS:
case Q933_REPT_LINK_INTEGRITY_VERIF:
if (!TLVP_PRES_LEN(tp, Q933_IEI_LINK_INT_VERIF, 2))
return -1;
link_int_rx = TLVP_VAL(tp, Q933_IEI_LINK_INT_VERIF);
link->last_rx_seq = link_int_rx[0];
/* The received receive sequence number is not valid if
* it is not equal to the last transmitted send sequence
* number. Ignore messages containing this error. As a
* result, timer T391 expires and the user then
* increments the error count. */
if (link_int_rx[1] != link->last_tx_seq)
return 0;
break;
case Q933_REPT_SINGLE_PVC_ASYNC_STS:
break;
default:
return -1;
}
/* FIXME: process any PVC Status IEs */
/* The network responds to each STATUS ENQUIRY message with a
* STATUS message and resets the T392 timer */
osmo_timer_schedule(&link->t392, osmo_tdef_get(link->net->T_defs, 392, OSMO_TDEF_S, 15), 0);
return tx_lmi_q933_status(link, rep_type);
}
static int fr_rx_lmi_q922(struct msgb *msg)
{
struct q933_a_hdr *qh;
struct tlv_parsed tp;
uint8_t *lapf;
int rc;
if (msgb_l2len(msg) < 1)
return -1;
lapf = msgb_l2(msg);
/* we only support LAPF UI frames */
if (lapf[0] != LAPF_UI)
return -1;
msg->l3h = msg->l2h + 1;
if (msgb_l3len(msg) < 3)
return -1;
qh = (struct q933_a_hdr *) msgb_l3(msg);
if (qh->prot_disc != Q931_PDISC_CC) {
LOGP(DFR, LOGL_NOTICE, "Rx unsupported LMI protocol discriminator %u\n", qh->prot_disc);
return -1;
}
tlv_parse(&tp, &q933_att_tlvdef, msgb_l3(msg) + sizeof(*qh), msgb_l3len(msg) - sizeof(*qh), 0, 0);
switch (qh->msg_type) {
case Q931_MSGT_STATUS_ENQUIRY:
rc = rx_lmi_q933_status_enq(msg, &tp);
break;
case Q931_MSGT_STATUS:
rc = rx_lmi_q933_status(msg, &tp);
break;
default:
LOGP(DFR, LOGL_NOTICE, "Rx unsupported LMI message type %u\n", qh->msg_type);
rc = -1;
break;
}
msgb_free(msg);
return rc;
}
int fr_rx(struct fr_link *link, struct msgb *msg)
{
uint8_t *frh;
uint16_t dlci;
struct fr_dlc *dlc;
msg->dst = link;
if (msgb_length(msg) < 2) {
LOGP(DFR, LOGL_ERROR, "Short FR header: %u bytes\n", msgb_length(msg));
msgb_free(msg);
return -1;
}
frh = msg->l1h = msgb_data(msg);
if (frh[0] & 0x01) {
LOGP(DFR, LOGL_NOTICE, "Unsupported single-byte FR address\n");
msgb_free(msg);
return 1;
}
if ((frh[1] & 0x0f) != 0x01) {
LOGP(DFR, LOGL_NOTICE, "Unknown second FR octet 0x%02x\n", frh[1]);
msgb_free(msg);
return -1;
}
dlci = q922_to_dlci(frh);
msg->l2h = frh + 2;
switch (dlci) {
case LMI_Q933A_DLCI:
return fr_rx_lmi_q922(msg);
case LMI_CISCO_DLCI:
LOGP(DFR, LOGL_NOTICE, "Unsupported FR DLCI %u\n", dlci);
msgb_free(msg);
return 0;
}
llist_for_each_entry(dlc, &link->dlc_list, list) {
if (dlc->dlci == dlci) {
/* dispatch to handler of respective DLC */
return dlc->rx_cb(dlc, msg);
}
}
if (link->unknown_dlc_rx_cb)
return link->unknown_dlc_rx_cb(NULL, msg);
else
LOGP(DFR, LOGL_NOTICE, "DLCI %u doesn't exist, discarding\n", dlci);
return 0;
}
/* Every T391 seconds, the user equipment sends a STATUS ENQUIRY
* message to the network and resets its polling timer (T391). */
static void fr_t391_cb(void *data)
{
struct fr_link *link = data;
if (link->polling_count % link->net->n391 == 0)
tx_lmi_q933_status_enq(link, Q933_REPT_FULL_STATUS);
else
tx_lmi_q933_status_enq(link, Q933_REPT_LINK_INTEGRITY_VERIF);
link->polling_count++;
osmo_timer_schedule(&link->t391, osmo_tdef_get(link->net->T_defs, 391, OSMO_TDEF_S, 10), 0);
}
static void fr_t392_cb(void *data)
{
struct fr_link *link = data;
/* A.5 The network increments the error count .. Non-receipt of
* a STATUS ENQUIRY within T392, which results in restarting
* T392 */
link->err_count++;
osmo_timer_schedule(&link->t392, osmo_tdef_get(link->net->T_defs, 392, OSMO_TDEF_S, 15), 0);
}
/* allocate a frame relay network */
struct fr_network *fr_network_alloc(void *ctx)
{
struct fr_network *net = talloc_zero(ctx, struct fr_network);
INIT_LLIST_HEAD(&net->links);
net->T_defs = fr_tdefs;
net->n391 = 6;
net->n392 = 3;
net->n393 = 4;
return net;
}
/* allocate a frame relay link in a given network */
struct fr_link *fr_link_alloc(struct fr_network *net)
{
struct fr_link *link = talloc_zero(net, struct fr_link);
if (!link)
return NULL;
link->net = net;
INIT_LLIST_HEAD(&link->dlc_list);
osmo_timer_setup(&link->t391, fr_t391_cb, link);
osmo_timer_setup(&link->t392, fr_t392_cb, link);
/* TODO: schedule any timers */
llist_add_tail(&link->list, &net->links);
return link;
}
/* allocate a data link connectoin on a given framerelay link */
struct fr_dlc *fr_dlc_alloc(struct fr_link *link, uint16_t dlci)
{
struct fr_dlc *dlc = talloc_zero(link, struct fr_dlc);
if (!dlc)
return NULL;
dlc->link = link;
dlc->dlci = dlci;
dlc->active = true; // FIXME: HACK
llist_add_tail(&dlc->list, &link->dlc_list);
dlc->new = true;
tx_lmi_q933_status(link, Q933_IEI_PVC_STATUS);
return dlc;
}

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src/frame_relay.h Normal file
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#pragma once
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/tdef.h>
#include <osmocom/core/timer.h>
struct fr_network {
struct llist_head links;
unsigned int n391; /* full status polling counter */
unsigned int n392; /* error threshold */
unsigned int n393; /* monitored events count */
struct osmo_tdef *T_defs; /* T391, T392 */
};
struct fr_dlc;
/* Frame Relay Link */
struct fr_link {
/* list in fr_network.links */
struct llist_head list;
struct fr_network *net;
/* value of the last received send sequence number field in the
* link integrity verification information element */
uint8_t last_rx_seq;
/* value of the send sequence number field of the last link
* integrity verification information element sent */
uint8_t last_tx_seq;
struct osmo_timer_list t391;
struct osmo_timer_list t392;
unsigned int polling_count;
unsigned int err_count;
/* list of data link connections at this link */
struct llist_head dlc_list;
int (*unknown_dlc_rx_cb)(struct fr_dlc *dlc, struct msgb *msg);
};
/* Frame Relay Data Link Connection */
struct fr_dlc {
/* entry in fr_link.dlc_list */
struct llist_head list;
struct fr_link *link;
uint16_t dlci;
/* is this DLC marked active for traffic? */
bool active;
/* was this DLC newly added? */
bool new;
/* is this DLC about to be destroyed */
bool del;
int (*rx_cb)(struct fr_dlc *dlc, struct msgb *msg);
};
/* allocate a frame relay network */
struct fr_network *fr_network_alloc(void *ctx);
/* allocate a frame relay link in a given network */
struct fr_link *fr_link_alloc(struct fr_network *net);
/* allocate a data link connectoin on a given framerelay link */
struct fr_dlc *fr_dlc_alloc(struct fr_link *link, uint16_t dlci);
int fr_rx(struct fr_link *link, struct msgb *msg);
extern int fr_tx(struct msgb *msg);