From 89579b4317a7f7ab6ee706399bee4b8f25a12c3a Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Fri, 4 Mar 2011 13:18:30 +0100 Subject: prefix sub-directories containing libraries with 'lib' ... and make sure tests work again after restructuring --- openbsc/src/libbsc/bsc_rll.c | 141 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 141 insertions(+) create mode 100644 openbsc/src/libbsc/bsc_rll.c (limited to 'openbsc/src/libbsc/bsc_rll.c') diff --git a/openbsc/src/libbsc/bsc_rll.c b/openbsc/src/libbsc/bsc_rll.c new file mode 100644 index 000000000..722f3fafc --- /dev/null +++ b/openbsc/src/libbsc/bsc_rll.c @@ -0,0 +1,141 @@ +/* GSM BSC Radio Link Layer API + * 3GPP TS 08.58 version 8.6.0 Release 1999 / ETSI TS 100 596 V8.6.0 */ + +/* (C) 2009 by Harald Welte + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 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 Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see . + * + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct bsc_rll_req { + struct llist_head list; + struct timer_list timer; + + struct gsm_lchan *lchan; + u_int8_t link_id; + + void (*cb)(struct gsm_lchan *lchan, u_int8_t link_id, + void *data, enum bsc_rllr_ind); + void *data; +}; + +/* we only compare C1, C2 and SAPI */ +#define LINKID_MASK 0xC7 + +static LLIST_HEAD(bsc_rll_reqs); + +static void complete_rllr(struct bsc_rll_req *rllr, enum bsc_rllr_ind type) +{ + llist_del(&rllr->list); + rllr->cb(rllr->lchan, rllr->link_id, rllr->data, type); + talloc_free(rllr); +} + +static void timer_cb(void *_rllr) +{ + struct bsc_rll_req *rllr = _rllr; + + complete_rllr(rllr, BSC_RLLR_IND_TIMEOUT); +} + +/* establish a RLL connection with given SAPI / priority */ +int rll_establish(struct gsm_lchan *lchan, u_int8_t sapi, + void (*cb)(struct gsm_lchan *, u_int8_t, void *, + enum bsc_rllr_ind), + void *data) +{ + struct bsc_rll_req *rllr = talloc_zero(tall_bsc_ctx, struct bsc_rll_req); + u_int8_t link_id; + if (!rllr) + return -ENOMEM; + + link_id = sapi; + + /* If we are a TCH and not in signalling mode, we need to + * indicate that the new RLL connection is to be made on the SACCH */ + if ((lchan->type == GSM_LCHAN_TCH_F || + lchan->type == GSM_LCHAN_TCH_H) && sapi != 0) + link_id |= 0x40; + + rllr->lchan = lchan; + rllr->link_id = link_id; + rllr->cb = cb; + rllr->data = data; + + llist_add(&rllr->list, &bsc_rll_reqs); + + rllr->timer.cb = &timer_cb; + rllr->timer.data = rllr; + + bsc_schedule_timer(&rllr->timer, 10, 0); + + /* send the RSL RLL ESTablish REQuest */ + return rsl_establish_request(rllr->lchan, rllr->link_id); +} + +/* Called from RSL code in case we have received an indication regarding + * any RLL link */ +void rll_indication(struct gsm_lchan *lchan, u_int8_t link_id, u_int8_t type) +{ + struct bsc_rll_req *rllr, *rllr2; + + llist_for_each_entry_safe(rllr, rllr2, &bsc_rll_reqs, list) { + if (rllr->lchan == lchan && + (rllr->link_id & LINKID_MASK) == (link_id & LINKID_MASK)) { + bsc_del_timer(&rllr->timer); + complete_rllr(rllr, type); + return; + } + } +} + +static int rll_lchan_signal(unsigned int subsys, unsigned int signal, + void *handler_data, void *signal_data) +{ + struct challoc_signal_data *challoc; + struct bsc_rll_req *rllr, *rllr2; + + if (subsys != SS_CHALLOC || signal != S_CHALLOC_FREED) + return 0; + + challoc = (struct challoc_signal_data *) signal_data; + + llist_for_each_entry_safe(rllr, rllr2, &bsc_rll_reqs, list) { + if (rllr->lchan == challoc->lchan) { + bsc_del_timer(&rllr->timer); + complete_rllr(rllr, BSC_RLLR_IND_ERR_IND); + } + } + + return 0; +} + +static __attribute__((constructor)) void on_dso_load_rll(void) +{ + register_signal_handler(SS_CHALLOC, rll_lchan_signal, NULL); +} -- cgit v1.2.3