RBS2000: Move SABM re-transmit logic into LAPD code
This means we now can support multiple LAPD links
This commit is contained in:
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334c5ab2e6
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dcf42e6cd2
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@ -31,8 +31,6 @@
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#include "input/lapd.h"
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#define SABM_INTERVAL 0, 300000
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static struct gsm_bts_model model_rbs2k = {
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.type = GSM_BTS_TYPE_RBS2000,
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.name = "rbs2000",
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@ -52,6 +50,26 @@ static int shutdown_om(struct gsm_bts *bts)
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return 0;
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}
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/* Tell LAPD to start start the SAP (send SABM requests) for all signalling
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* timeslots in this line */
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static void start_sabm_in_line(struct e1inp_line *line)
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{
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struct e1inp_sign_link *link;
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int i;
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for (i = 0; i < ARRAY_SIZE(line->ts); i++) {
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struct e1inp_ts *ts = &line->ts[i];
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if (ts->type != E1INP_TS_TYPE_SIGN)
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continue;
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llist_for_each_entry(link, &ts->sign.sign_links, list) {
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lapd_sap_start(ts->driver.dahdi.lapd, link->tei, link->sapi);
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}
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}
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}
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/* Callback function to be called every time we receive a signal from INPUT */
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static int gbl_sig_cb(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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@ -72,23 +90,6 @@ static int gbl_sig_cb(unsigned int subsys, unsigned int signal,
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return 0;
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}
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static void sabm_timer_cb(void *_line);
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/* FIXME: we need one per bts (or rather: per signalling TS, not one global! */
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struct timer_list sabm_timer = {
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.cb = &sabm_timer_cb,
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};
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static void sabm_timer_cb(void *_line)
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{
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struct e1inp_ts *e1i_ts = _line;
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/* FIXME: use the TEI that was configured via vty */
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lapd_send_sabm(e1i_ts->driver.dahdi.lapd, 62, 62);
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bsc_schedule_timer(&sabm_timer, SABM_INTERVAL);
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}
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/* Callback function to be called every time we receive a signal from INPUT */
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static int inp_sig_cb(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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@ -103,8 +104,6 @@ static int inp_sig_cb(unsigned int subsys, unsigned int signal,
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switch (isd->link_type) {
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case E1INP_SIGN_OML:
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if (isd->trx->bts->type == GSM_BTS_TYPE_RBS2000) {
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/* FIXME: only disable the timer that belong sto this timeslot */
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bsc_del_timer(&sabm_timer);
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bootstrap_om_rbs2k(isd->trx->bts);
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}
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break;
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@ -114,10 +113,7 @@ static int inp_sig_cb(unsigned int subsys, unsigned int signal,
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/* Right now Ericsson RBS are only supported on DAHDI */
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if (strcasecmp(isd->line->driver->name, "DAHDI"))
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break;
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/* FIXME: properly determine the OML signalling timeslot,
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* or rather: all signalling timeslots and start one timer each */
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sabm_timer.data = &isd->line->ts[1-1];
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bsc_schedule_timer(&sabm_timer, SABM_INTERVAL);
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start_sabm_in_line(isd->line);
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break;
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}
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@ -1,9 +1,9 @@
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/* OpenBSC minimal LAPD implementation */
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/* (C) 2009 by oystein@homelien.no
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* (C) 2011 by Harald Welte <laforge@gnumonks.org>
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* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by Digium and Matthew Fredrickson <creslin@digium.com>
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* (C) 2011 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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@ -23,6 +23,12 @@
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*
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*/
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/* TODO:
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* detect RR timeout and set SAP state back to SABM_RETRANSMIT
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* use of value_string
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* further code cleanup (spaghetti)
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*/
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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@ -33,13 +39,14 @@
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#include <osmocore/linuxlist.h>
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#include <osmocore/talloc.h>
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#include <osmocore/msgb.h>
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#include <osmocore/timer.h>
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#include <openbsc/debug.h>
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#define SABM_INTERVAL 0, 300000
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typedef enum {
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LAPD_TEI_NONE = 0,
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LAPD_TEI_ASSIGNED,
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LAPD_TEI_ACTIVE,
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} lapd_tei_state;
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@ -93,10 +100,24 @@ const char *lapd_cmd_types[] = {
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};
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enum lapd_sap_state {
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SAP_STATE_INACTIVE,
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SAP_STATE_SABM_RETRANS,
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SAP_STATE_ACTIVE,
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};
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const char *lapd_sap_states[] = {
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"INACTIVE",
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"SABM_RETRANS",
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"ACTIVE",
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};
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const char *lapd_msg_types = "?ISU";
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/* structure representing an allocated TEI within a LAPD instance */
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struct lapd_tei {
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struct llist_head list;
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struct lapd_instance *li;
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uint8_t tei;
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/* A valid N(R) value is one that is in the range V(A) ≤ N(R) ≤ V(S). */
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@ -104,6 +125,19 @@ struct lapd_tei {
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int va; /* last acked by peer */
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int vr; /* next expected to be received */
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lapd_tei_state state;
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struct llist_head sap_list;
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};
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/* Structure representing a SAP within a TEI. We use this for TE-mode to
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* re-transmit SABM */
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struct lapd_sap {
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struct llist_head list;
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struct lapd_tei *tei;
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uint8_t sapi;
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enum lapd_sap_state state;
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struct timer_list sabme_timer; /* timer to re-transmit SABM message */
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};
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/* 3.5.2.2 Send state variable V(S)
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@ -142,6 +176,7 @@ struct lapd_tei {
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* correctly received all I frames numbered up to and including N(R) − 1.
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*/
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/* Resolve TEI structure from given numeric TEI */
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static struct lapd_tei *teip_from_tei(struct lapd_instance *li, uint8_t tei)
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{
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struct lapd_tei *lt;
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@ -155,28 +190,87 @@ static struct lapd_tei *teip_from_tei(struct lapd_instance *li, uint8_t tei)
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static void lapd_tei_set_state(struct lapd_tei *teip, int newstate)
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{
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DEBUGP(DMI, "state change on tei %d: %s -> %s\n", teip->tei,
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DEBUGP(DMI, "state change on TEI %d: %s -> %s\n", teip->tei,
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lapd_tei_states[teip->state], lapd_tei_states[newstate]);
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teip->state = newstate;
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};
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int lapd_tei_alloc(struct lapd_instance *li, uint8_t tei)
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/* Allocate a new TEI */
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struct lapd_tei *lapd_tei_alloc(struct lapd_instance *li, uint8_t tei)
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{
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struct lapd_tei *teip;
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teip = talloc_zero(li, struct lapd_tei);
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if (!teip)
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return -ENOMEM;
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return NULL;
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teip->li = li;
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teip->tei = tei;
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llist_add(&teip->list, &li->tei_list);
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INIT_LLIST_HEAD(&teip->sap_list);
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lapd_tei_set_state(teip, LAPD_TEI_ASSIGNED);
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return 0;
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return teip;
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}
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/* Find a SAP within a given TEI */
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static struct lapd_sap *lapd_sap_find(struct lapd_tei *teip, uint8_t sapi)
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{
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struct lapd_sap *sap;
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llist_for_each_entry(sap, &teip->sap_list, list) {
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if (sap->sapi == sapi)
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return sap;
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}
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return NULL;
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}
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static void sabme_timer_cb(void *_sap);
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/* Allocate a new SAP within a given TEI */
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static struct lapd_sap *lapd_sap_alloc(struct lapd_tei *teip, uint8_t sapi)
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{
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struct lapd_sap *sap = talloc_zero(teip, struct lapd_sap);
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LOGP(DMI, LOGL_INFO, "Allocating SAP for SAPI=%u / TEI=%u\n",
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sapi, teip->tei);
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sap->sapi = sapi;
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sap->tei = teip;
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sap->sabme_timer.cb = &sabme_timer_cb;
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sap->sabme_timer.data = sap;
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llist_add(&sap->list, &teip->sap_list);
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return sap;
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}
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static void lapd_sap_set_state(struct lapd_tei *teip, uint8_t sapi,
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enum lapd_sap_state newstate)
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{
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struct lapd_sap *sap = lapd_sap_find(teip, sapi);
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if (!sap)
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return;
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DEBUGP(DMI, "state change on TEI %u / SAPI %u: %s -> %s\n", teip->tei,
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sapi, lapd_sap_states[sap->state], lapd_sap_states[newstate]);
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switch (sap->state) {
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case SAP_STATE_SABM_RETRANS:
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if (newstate != SAP_STATE_SABM_RETRANS)
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bsc_del_timer(&sap->sabme_timer);
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break;
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default:
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if (newstate == SAP_STATE_SABM_RETRANS)
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bsc_schedule_timer(&sap->sabme_timer, SABM_INTERVAL);
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break;
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}
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sap->state = newstate;
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};
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/* Input function into TEI manager */
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static void lapd_tei_receive(struct lapd_instance *li, uint8_t *data, int len)
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{
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uint8_t entity = data[0];
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};
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};
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/* General input function for any data received for this LAPD instance */
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uint8_t *lapd_receive(struct lapd_instance *li, uint8_t * data, unsigned int len,
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int *ilen, lapd_mph_type *prim)
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{
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teip->vr = 0;
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teip->va = 0;
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lapd_tei_set_state(teip, LAPD_TEI_ACTIVE);
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lapd_sap_set_state(teip, sapi, SAP_STATE_ACTIVE);
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*prim = LAPD_MPH_ACTIVATE_IND;
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break;
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case LAPD_CMD_RR:
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@ -478,7 +574,8 @@ uint8_t *lapd_receive(struct lapd_instance *li, uint8_t * data, unsigned int len
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return NULL;
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};
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int lapd_send_sabm(struct lapd_instance *li, uint8_t tei, uint8_t sapi)
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/* low-level function to send a single SABM message */
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static int lapd_send_sabm(struct lapd_instance *li, uint8_t tei, uint8_t sapi)
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{
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struct msgb *msg = msgb_alloc_headroom(1024, 128, "LAPD SABM");
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if (!msg)
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DEBUGP(DMI, "Sending SABM for TEI=%u, SAPI=%u\n", tei, sapi);
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/* make sure we know the TEI at the time the response comes in */
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if (!teip_from_tei(li, tei))
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lapd_tei_alloc(li, tei);
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msgb_put_u8(msg, (sapi << 2) | (li->network_side ? 2 : 0));
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msgb_put_u8(msg, (tei << 1) | 1);
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msgb_put_u8(msg, 0x7F);
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return 0;
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}
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/* timer call-back function for SABM re-transmission */
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static void sabme_timer_cb(void *_sap)
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{
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struct lapd_sap *sap = _sap;
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lapd_send_sabm(sap->tei->li, sap->tei->tei, sap->sapi);
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bsc_schedule_timer(&sap->sabme_timer, SABM_INTERVAL);
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}
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/* Start a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */
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int lapd_sap_start(struct lapd_instance *li, uint8_t tei, uint8_t sapi)
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{
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struct lapd_sap *sap;
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struct lapd_tei *teip;
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teip = teip_from_tei(li, tei);
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if (!teip)
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teip = lapd_tei_alloc(li, tei);
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sap = lapd_sap_find(teip, sapi);
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if (sap)
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return -EEXIST;
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sap = lapd_sap_alloc(teip, sapi);
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lapd_sap_set_state(teip, sapi, SAP_STATE_SABM_RETRANS);
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return 0;
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}
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/* Stop a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */
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int lapd_sap_stop(struct lapd_instance *li, uint8_t tei, uint8_t sapi)
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{
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struct lapd_tei *teip;
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struct lapd_sap *sap;
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teip = teip_from_tei(li, tei);
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if (!teip)
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return -ENODEV;
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sap = lapd_sap_find(teip, sapi);
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if (!sap)
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return -ENODEV;
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bsc_del_timer(&sap->sabme_timer);
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llist_del(&sap->list);
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talloc_free(sap);
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return 0;
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}
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/* Transmit Data (I-Frame) on the given LAPD Instance / TEI / SAPI */
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void lapd_transmit(struct lapd_instance *li, uint8_t tei, uint8_t sapi,
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uint8_t *data, unsigned int len)
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{
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li->transmit_cb(buf, len, li->cbdata);
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};
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/* Allocate a new LAPD instance */
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struct lapd_instance *lapd_instance_alloc(int network_side,
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void (*tx_cb)(uint8_t *data, int len,
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void *cbdata), void *cbdata)
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void (*tx_cb)(uint8_t *data, int len,
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void *cbdata), void *cbdata);
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int lapd_send_sabm(struct lapd_instance *li, uint8_t tei, uint8_t sapi);
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/* Start a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */
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int lapd_sap_start(struct lapd_instance *li, uint8_t tei, uint8_t sapi);
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/* Stop a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */
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int lapd_sap_stop(struct lapd_instance *li, uint8_t tei, uint8_t sapi);
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#endif /* OPENBSC_LAPD_H */
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