mirror of https://gerrit.osmocom.org/libosmocore
854 lines
26 KiB
C
854 lines
26 KiB
C
/* BSSGP per-BVC Finite State Machine */
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/* (C) 2020 Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <string.h>
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#include <stdio.h>
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#include <osmocom/core/fsm.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/tdef.h>
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#include <osmocom/gsm/gsm48.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/gprs/gprs_msgb.h>
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#include <osmocom/gprs/gprs_bssgp.h>
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#include <osmocom/gprs/gprs_bssgp2.h>
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#include <osmocom/gprs/bssgp_bvc_fsm.h>
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#include "common_vty.h"
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#define S(x) (1 << (x))
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/* TODO: Those are not made cofnigurable via a VTY yet */
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struct osmo_tdef bssgp_bvc_fsm_tdefs[] = {
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{
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.T = 1,
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.default_val = 5,
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.min_val = 1,
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.max_val = 30,
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.unit = OSMO_TDEF_S,
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.desc = "Guards the BSSGP BVC (un)blocking procedure",
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}, {
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.T = 2,
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.default_val = 10,
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.min_val = 1,
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.max_val = 120,
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.unit = OSMO_TDEF_S,
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.desc = "Guards the BSSGP BVC reset procedure",
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}, {
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.T = 3,
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.default_val = 500,
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.min_val = 100,
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.max_val = 10000,
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.unit = OSMO_TDEF_MS,
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.desc = "Guards the BSSGP SUSPEND procedure",
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}, {
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.T = 4,
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.default_val = 500,
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.min_val = 100,
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.max_val = 10000,
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.unit = OSMO_TDEF_MS,
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.desc = "Guards the BSSGP RESUME procedure",
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}, {
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.T = 5,
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.default_val = 15,
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.min_val = 1,
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.max_val = 30,
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.unit = OSMO_TDEF_S,
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.desc = "Guards the BSSGP Radio Access Capability Update procedure",
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},
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{}
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};
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#define T1 1
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#define T2 2
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/* We cannot use osmo_tdef_fsm_* as it makes hard-coded assumptions that
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* each new/target state will always use the same timer and timeout - or
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* a timeout at all */
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#define T1_SECS osmo_tdef_get(bssgp_bvc_fsm_tdefs, 1, OSMO_TDEF_S, 5)
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#define T2_SECS osmo_tdef_get(bssgp_bvc_fsm_tdefs, 2, OSMO_TDEF_S, 10)
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/* forward declaration */
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static struct osmo_fsm bssgp_bvc_fsm;
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static const struct value_string ptp_bvc_event_names[] = {
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{ BSSGP_BVCFSM_E_RX_BLOCK, "RX-BVC-BLOCK" },
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{ BSSGP_BVCFSM_E_RX_BLOCK_ACK, "RX-BVC-BLOCK-ACK" },
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{ BSSGP_BVCFSM_E_RX_UNBLOCK, "RX-BVC-UNBLOCK" },
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{ BSSGP_BVCFSM_E_RX_UNBLOCK_ACK, "RX-BVC-UNBLOCK-ACK" },
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{ BSSGP_BVCFSM_E_RX_RESET, "RX-BVC-RESET" },
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{ BSSGP_BVCFSM_E_RX_RESET_ACK, "RX-BVC-RESET-ACK" },
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{ BSSGP_BVCFSM_E_RX_FC_BVC, "RX-FLOW-CONTROL-BVC" },
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{ BSSGP_BVCFSM_E_RX_FC_BVC_ACK, "RX-FLOW-CONTROL-BVC-ACK" },
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{ BSSGP_BVCFSM_E_REQ_BLOCK, "REQ-BLOCK" },
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{ BSSGP_BVCFSM_E_REQ_UNBLOCK, "REQ-UNBLOCK" },
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{ BSSGP_BVCFSM_E_REQ_RESET, "REQ-RESET" },
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{ BSSGP_BVCFSM_E_REQ_FC_BVC, "REQ-FLOW-CONTROL-BVC" },
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{ 0, NULL }
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};
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struct bvc_fsm_priv {
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/* NS-instance; defining the scope for NSEI below */
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struct gprs_ns2_inst *nsi;
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/* NSEI of the underlying NS Entity */
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uint16_t nsei;
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/* Maximum size of the BSSGP PDU */
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uint16_t max_pdu_len;
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/* BVCI of this BVC */
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uint16_t bvci;
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/* are we the SGSN (true) or the BSS (false) */
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bool role_sgsn;
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/* BSS side: are we locally marked blocked? */
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bool locally_blocked;
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uint8_t block_cause;
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/* cause value of the last outbound BVC-RESET (for re-transmissions) */
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uint8_t last_reset_cause;
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struct {
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/* Bit 0..7: Features; Bit 8..15: Extended Features */
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uint32_t advertised;
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uint32_t received;
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uint32_t negotiated;
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/* only used if BSSGP_XFEAT_GBIT is negotiated */
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enum bssgp_fc_granularity fc_granularity;
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} features;
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/* Cell Identification used by BSS when
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* transmitting BVC-RESET / BVC-RESET-ACK, or those received
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* from BSS in SGSN role */
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struct gprs_ra_id ra_id;
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uint16_t cell_id;
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/* call-backs provided by the user */
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const struct bssgp_bvc_fsm_ops *ops;
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/* private data pointer passed to each call-back invocation */
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void *ops_priv;
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};
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static int fi_tx_ptp(struct osmo_fsm_inst *fi, struct msgb *msg)
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{
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
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struct bvc_fsm_priv *bfp = fi->priv;
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OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
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LOGPFSM(fi, "Tx BSSGP %s\n", osmo_tlv_prot_msg_name(&osmo_pdef_bssgp, bgph->pdu_type));
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return bssgp2_nsi_tx_ptp(bfp->nsi, bfp->nsei, bfp->bvci, msg, 0);
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}
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static int fi_tx_sig(struct osmo_fsm_inst *fi, struct msgb *msg)
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{
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
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struct bvc_fsm_priv *bfp = fi->priv;
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OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
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LOGPFSM(fi, "Tx BSSGP %s\n", osmo_tlv_prot_msg_name(&osmo_pdef_bssgp, bgph->pdu_type));
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return bssgp2_nsi_tx_sig(bfp->nsi, bfp->nsei, msg, 0);
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}
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/* helper function to transmit BVC-RESET with right combination of conditional/optional IEs */
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static void _tx_bvc_reset(struct osmo_fsm_inst *fi, uint8_t cause)
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{
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struct bvc_fsm_priv *bfp = fi->priv;
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const uint8_t *features = NULL;
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const uint8_t *features_ext = NULL;
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uint8_t _features[2] = {
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(bfp->features.advertised >> 0) & 0xff,
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(bfp->features.advertised >> 8) & 0xff,
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};
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struct msgb *tx;
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OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
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/* transmit BVC-RESET to peer; RA-ID only present for PTP from BSS */
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if (bfp->bvci == 0) {
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features = &_features[0];
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features_ext = &_features[1];
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}
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tx = bssgp2_enc_bvc_reset(bfp->bvci, cause,
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bfp->bvci && !bfp->role_sgsn ? &bfp->ra_id : NULL,
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bfp->cell_id, features, features_ext);
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fi_tx_sig(fi, tx);
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}
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/* helper function to transmit BVC-RESET-ACK with right combination of conditional/optional IEs */
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static void _tx_bvc_reset_ack(struct osmo_fsm_inst *fi)
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{
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struct bvc_fsm_priv *bfp = fi->priv;
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const uint8_t *features = NULL;
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const uint8_t *features_ext = NULL;
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uint8_t _features[2] = {
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(bfp->features.advertised >> 0) & 0xff,
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(bfp->features.advertised >> 8) & 0xff,
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};
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struct msgb *tx;
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OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
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/* transmit BVC-RESET-ACK to peer; RA-ID only present for PTP from BSS -> SGSN */
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if (bfp->bvci == 0) {
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features = &_features[0];
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features_ext = &_features[1];
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}
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tx = bssgp2_enc_bvc_reset_ack(bfp->bvci, bfp->bvci && !bfp->role_sgsn ? &bfp->ra_id : NULL,
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bfp->cell_id, features, features_ext);
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fi_tx_sig(fi, tx);
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}
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/* helper function to transmit BVC-STATUS with right combination of conditional/optional IEs */
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static void _tx_status(struct osmo_fsm_inst *fi, enum gprs_bssgp_cause cause, const struct msgb *rx)
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{
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struct bvc_fsm_priv *bfp = fi->priv;
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struct msgb *tx;
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uint16_t *bvci = NULL;
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/* GSM 08.18, 10.4.14.1: The BVCI must be included if (and only if) the
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* cause is either "BVCI blocked" or "BVCI unknown" */
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if (cause == BSSGP_CAUSE_UNKNOWN_BVCI || cause == BSSGP_CAUSE_BVCI_BLOCKED)
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bvci = &bfp->bvci;
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tx = bssgp2_enc_status(cause, bvci, rx, bfp->max_pdu_len);
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if (msgb_bvci(rx) == 0)
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fi_tx_sig(fi, tx);
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else
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fi_tx_ptp(fi, tx);
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}
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/* Update the features by bit-wise AND of advertised + received features */
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static void update_negotiated_features(struct osmo_fsm_inst *fi, const struct tlv_parsed *tp)
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{
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struct bvc_fsm_priv *bfp = fi->priv;
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OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
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bfp->features.received = 0;
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if (TLVP_PRES_LEN(tp, BSSGP_IE_FEATURE_BITMAP, 1))
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bfp->features.received |= *TLVP_VAL(tp, BSSGP_IE_FEATURE_BITMAP);
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if (TLVP_PRES_LEN(tp, BSSGP_IE_EXT_FEATURE_BITMAP, 1))
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bfp->features.received |= (*TLVP_VAL(tp, BSSGP_IE_EXT_FEATURE_BITMAP) << 8);
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bfp->features.negotiated = bfp->features.advertised & bfp->features.received;
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LOGPFSML(fi, LOGL_NOTICE, "Updating features: Advertised 0x%04x, Received 0x%04x, Negotiated 0x%04x\n",
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bfp->features.advertised, bfp->features.received, bfp->features.negotiated);
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}
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/* "tail" of each onenter() handler: Calling the state change notification call-back */
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static void _onenter_tail(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct bvc_fsm_priv *bfp = fi->priv;
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if (prev_state == fi->state)
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return;
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if (bfp->ops && bfp->ops->state_chg_notification)
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bfp->ops->state_chg_notification(bfp->nsei, bfp->bvci, prev_state, fi->state, bfp->ops_priv);
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}
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static void bssgp_bvc_fsm_null(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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/* we don't really expect anything in this state; all handled via allstate */
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OSMO_ASSERT(0);
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}
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static void bssgp_bvc_fsm_blocked_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct bvc_fsm_priv *bfp = fi->priv;
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/* signaling BVC can never be blocked */
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OSMO_ASSERT(bfp->bvci != 0);
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_onenter_tail(fi, prev_state);
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}
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static void bssgp_bvc_fsm_blocked(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct bvc_fsm_priv *bfp = fi->priv;
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struct msgb *rx = NULL, *tx;
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const struct tlv_parsed *tp = NULL;
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uint8_t cause;
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switch (event) {
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case BSSGP_BVCFSM_E_RX_BLOCK_ACK:
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rx = data;
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tp = (const struct tlv_parsed *) msgb_bcid(rx);
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/* If a BVC-BLOCK-ACK PDU is received by a BSS for the signalling BVC, the PDU is ignored. */
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if (bfp->bvci == 0) {
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LOGPFSML(fi, LOGL_ERROR, "Rx BVC-BLOCK-ACK on BVCI=0 is illegal\n");
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if (!bfp->role_sgsn)
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break;
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_tx_status(fi, BSSGP_CAUSE_SEM_INCORR_PDU, rx);
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break;
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}
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/* stop T1 timer */
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osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_BLOCKED, 0, 0);
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break;
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case BSSGP_BVCFSM_E_RX_BLOCK:
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rx = data;
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tp = (const struct tlv_parsed *) msgb_bcid(rx);
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cause = *TLVP_VAL(tp, BSSGP_IE_CAUSE);
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LOGPFSML(fi, LOGL_NOTICE, "Rx BVC-BLOCK (cause=%s)\n", bssgp_cause_str(cause));
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/* If a BVC-BLOCK PDU is received by an SGSN for a blocked BVC, a BVC-BLOCK-ACK
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* PDU shall be returned. */
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if (bfp->role_sgsn) {
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/* If a BVC-BLOCK PDU is received by an SGSN for
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* the signalling BVC, the PDU is ignored */
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if (bfp->bvci == 0)
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break;
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tx = bssgp2_enc_bvc_block_ack(bfp->bvci);
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fi_tx_sig(fi, tx);
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}
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break;
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case BSSGP_BVCFSM_E_RX_UNBLOCK:
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rx = data;
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tp = (const struct tlv_parsed *) msgb_bcid(rx);
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LOGPFSML(fi, LOGL_NOTICE, "Rx BVC-UNBLOCK\n");
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if (bfp->bvci == 0) {
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LOGPFSML(fi, LOGL_ERROR, "Rx BVC-UNBLOCK on BVCI=0 is illegal\n");
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/* If BVC-UNBLOCK PDU is received by an SGSN for the signalling BVC, the PDU is ignored.*/
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if (bfp->role_sgsn)
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break;
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_tx_status(fi, BSSGP_CAUSE_SEM_INCORR_PDU, rx);
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break;
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}
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if (!bfp->role_sgsn) {
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LOGPFSML(fi, LOGL_ERROR, "Rx BVC-UNBLOCK on BSS is illegal\n");
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_tx_status(fi, BSSGP_CAUSE_SEM_INCORR_PDU, rx);
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break;
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}
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tx = bssgp2_enc_bvc_unblock_ack(bfp->bvci);
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fi_tx_sig(fi, tx);
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osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_UNBLOCKED, T1_SECS, T1);
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break;
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case BSSGP_BVCFSM_E_REQ_UNBLOCK:
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if (bfp->role_sgsn) {
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LOGPFSML(fi, LOGL_ERROR, "SGSN side cannot initiate BVC unblock\n");
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break;
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}
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if (bfp->bvci == 0) {
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LOGPFSML(fi, LOGL_ERROR, "BVCI 0 cannot be unblocked\n");
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break;
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}
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bfp->locally_blocked = false;
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tx = bssgp2_enc_bvc_unblock(bfp->bvci);
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fi_tx_sig(fi, tx);
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osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_UNBLOCKED, 0, 0);
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break;
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}
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}
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/* Waiting for RESET-ACK: Receive PDUs but don't transmit */
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static void bssgp_bvc_fsm_wait_reset_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct bvc_fsm_priv *bfp = fi->priv;
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const struct tlv_parsed *tp = NULL;
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struct msgb *rx = NULL, *tx;
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switch (event) {
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case BSSGP_BVCFSM_E_RX_RESET:
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/* 48.018 Section 8.4.3: If the BSS (or SGSN) has sent a BVC-RESET PDU for a BVCI to
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* the SGSN (or BSS) and is awaiting a BVC-RESET-ACK PDU in response, but instead
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* receives a BVC-RESET PDU indicating the same BVCI, then this shall be interpreted
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* as a BVC-RESET ACK PDU and the T2 timer shall be stopped. */
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/* fall-through */
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case BSSGP_BVCFSM_E_RX_RESET_ACK:
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rx = data;
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tp = (const struct tlv_parsed *) msgb_bcid(rx);
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if (bfp->bvci == 0)
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update_negotiated_features(fi, tp);
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if (bfp->role_sgsn && bfp->bvci != 0)
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bfp->cell_id = bssgp_parse_cell_id(&bfp->ra_id, TLVP_VAL(tp, BSSGP_IE_CELL_ID));
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if (!bfp->role_sgsn && bfp->bvci != 0 && bfp->locally_blocked) {
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/* initiate the blocking procedure */
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/* transmit BVC-BLOCK, transition to BLOCKED state and start re-transmit timer */
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tx = bssgp2_enc_bvc_block(bfp->bvci, bfp->block_cause);
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fi_tx_sig(fi, tx);
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osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_BLOCKED, T1_SECS, T1);
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} else
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osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_UNBLOCKED, 0, 0);
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break;
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}
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}
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static void bssgp_bvc_fsm_unblocked(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct bssgp2_flow_ctrl rx_fc, *tx_fc;
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struct bvc_fsm_priv *bfp = fi->priv;
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const struct tlv_parsed *tp = NULL;
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struct msgb *rx = NULL, *tx;
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int rc;
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switch (event) {
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case BSSGP_BVCFSM_E_RX_UNBLOCK_ACK:
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rx = data;
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tp = (const struct tlv_parsed *) msgb_bcid(rx);
|
|
/* If BVC-UNBLOCK-ACK PDU is received by an BSS for the signalling BVC, the PDU is ignored. */
|
|
LOGPFSML(fi, LOGL_ERROR, "Rx BVC-UNBLOCK-ACK on BVCI=0 is illegal\n");
|
|
if (bfp->bvci == 0) {
|
|
if (!bfp->role_sgsn)
|
|
break;
|
|
_tx_status(fi, BSSGP_CAUSE_SEM_INCORR_PDU, rx);
|
|
break;
|
|
}
|
|
/* stop T1 timer */
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_UNBLOCKED, 0, 0);
|
|
break;
|
|
case BSSGP_BVCFSM_E_RX_UNBLOCK:
|
|
rx = data;
|
|
tp = (const struct tlv_parsed *) msgb_bcid(rx);
|
|
/* If a BVC-UNBLOCK PDU is received by an SGSN for a blocked BVC, a BVC-UNBLOCK-ACK
|
|
* PDU shall be returned. */
|
|
if (bfp->role_sgsn) {
|
|
/* If a BVC-UNBLOCK PDU is received by an SGSN for
|
|
* the signalling BVC, the PDU is ignored */
|
|
if (bfp->bvci == 0)
|
|
break;
|
|
bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_UNBLOCK_ACK, bfp->nsei, bfp->bvci, 0);
|
|
}
|
|
break;
|
|
case BSSGP_BVCFSM_E_RX_BLOCK:
|
|
rx = data;
|
|
tp = (const struct tlv_parsed *) msgb_bcid(rx);
|
|
LOGPFSML(fi, LOGL_NOTICE, "Rx BVC-BLOCK (cause=%s)\n",
|
|
bssgp_cause_str(*TLVP_VAL(tp, BSSGP_IE_CAUSE)));
|
|
/* If a BVC-BLOCK PDU is received by an SGSN for the signalling BVC, the PDU is ignored */
|
|
if (bfp->bvci == 0) {
|
|
LOGPFSML(fi, LOGL_ERROR, "Rx BVC-BLOCK on BVCI=0 is illegal\n");
|
|
if (bfp->role_sgsn)
|
|
break;
|
|
_tx_status(fi, BSSGP_CAUSE_SEM_INCORR_PDU, rx);
|
|
break;
|
|
}
|
|
if (!bfp->role_sgsn) {
|
|
LOGPFSML(fi, LOGL_ERROR, "Rx BVC-BLOCK on BSS is illegal\n");
|
|
_tx_status(fi, BSSGP_CAUSE_SEM_INCORR_PDU, rx);
|
|
break;
|
|
}
|
|
/* transmit BVC-BLOCK-ACK, transition to BLOCKED state */
|
|
tx = bssgp2_enc_bvc_block_ack(bfp->bvci);
|
|
fi_tx_sig(fi, tx);
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_BLOCKED, 0, 0);
|
|
break;
|
|
case BSSGP_BVCFSM_E_REQ_BLOCK:
|
|
if (bfp->role_sgsn) {
|
|
LOGPFSML(fi, LOGL_ERROR, "SGSN may not initiate BVC-BLOCK\n");
|
|
break;
|
|
}
|
|
if (bfp->bvci == 0) {
|
|
LOGPFSML(fi, LOGL_ERROR, "BVCI 0 cannot be blocked\n");
|
|
break;
|
|
}
|
|
bfp->locally_blocked = true;
|
|
bfp->block_cause = *(uint8_t *)data;
|
|
/* transmit BVC-BLOCK, transition to BLOCKED state and start re-transmit timer */
|
|
tx = bssgp2_enc_bvc_block(bfp->bvci, bfp->block_cause);
|
|
fi_tx_sig(fi, tx);
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_BLOCKED, T1_SECS, T1);
|
|
break;
|
|
case BSSGP_BVCFSM_E_RX_FC_BVC:
|
|
rx = data;
|
|
tp = (const struct tlv_parsed *) msgb_bcid(rx);
|
|
/* we assume osmo_tlv_prot_* has been used before calling here to ensure this */
|
|
OSMO_ASSERT(bfp->role_sgsn);
|
|
rc = bssgp2_dec_fc_bvc(&rx_fc, tp);
|
|
if (rc < 0) {
|
|
_tx_status(fi, BSSGP_CAUSE_SEM_INCORR_PDU, rx);
|
|
break;
|
|
}
|
|
if (bfp->ops->rx_fc_bvc)
|
|
bfp->ops->rx_fc_bvc(bfp->nsei, bfp->bvci, &rx_fc, bfp->ops_priv);
|
|
tx = bssgp2_enc_fc_bvc_ack(rx_fc.tag);
|
|
fi_tx_ptp(fi, tx);
|
|
break;
|
|
case BSSGP_BVCFSM_E_RX_FC_BVC_ACK:
|
|
rx = data;
|
|
tp = (const struct tlv_parsed *) msgb_bcid(rx);
|
|
/* we assume osmo_tlv_prot_* has been used before calling here to ensure this */
|
|
OSMO_ASSERT(!bfp->role_sgsn);
|
|
break;
|
|
case BSSGP_BVCFSM_E_REQ_FC_BVC:
|
|
tx_fc = data;
|
|
tx = bssgp2_enc_fc_bvc(tx_fc, bfp->features.negotiated & (BSSGP_XFEAT_GBIT << 8) ?
|
|
&bfp->features.fc_granularity : NULL);
|
|
fi_tx_ptp(fi, tx);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void bssgp_bvc_fsm_allstate(struct osmo_fsm_inst *fi, uint32_t event, void *data)
|
|
{
|
|
struct bvc_fsm_priv *bfp = fi->priv;
|
|
uint8_t cause;
|
|
const struct tlv_parsed *tp = NULL;
|
|
struct msgb *rx = NULL;
|
|
|
|
switch (event) {
|
|
case BSSGP_BVCFSM_E_REQ_RESET:
|
|
bfp->locally_blocked = false;
|
|
cause = bfp->last_reset_cause = *(uint8_t *) data;
|
|
_tx_bvc_reset(fi, cause);
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_WAIT_RESET_ACK, T2_SECS, T2);
|
|
#if 0 /* not sure if we really should notify the application if itself has requested the reset? */
|
|
if (bfp->ops && bfp->ops->reset_notification)
|
|
bfp->ops->reset_notification(bfp->nsei, bfp->bvci, NULL, 0, cause, bfp->ops_priv);
|
|
#endif
|
|
break;
|
|
case BSSGP_BVCFSM_E_RX_RESET:
|
|
rx = data;
|
|
tp = (const struct tlv_parsed *) msgb_bcid(rx);
|
|
cause = *TLVP_VAL(tp, BSSGP_IE_CAUSE);
|
|
if (bfp->role_sgsn && bfp->bvci != 0)
|
|
bfp->cell_id = bssgp_parse_cell_id(&bfp->ra_id, TLVP_VAL(tp, BSSGP_IE_CELL_ID));
|
|
LOGPFSML(fi, LOGL_NOTICE, "Rx BVC-RESET (cause=%s)\n", bssgp_cause_str(cause));
|
|
if (bfp->bvci == 0)
|
|
update_negotiated_features(fi, tp);
|
|
_tx_bvc_reset_ack(fi);
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_UNBLOCKED, 0, 0);
|
|
if (bfp->ops && bfp->ops->reset_notification) {
|
|
bfp->ops->reset_notification(bfp->nsei, bfp->bvci, &bfp->ra_id, bfp->cell_id,
|
|
cause, bfp->ops_priv);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int bssgp_bvc_fsm_timer_cb(struct osmo_fsm_inst *fi)
|
|
{
|
|
struct bvc_fsm_priv *bfp = fi->priv;
|
|
struct msgb *tx;
|
|
|
|
switch (fi->T) {
|
|
case T1:
|
|
switch (fi->state) {
|
|
case BSSGP_BVCFSM_S_BLOCKED:
|
|
/* re-transmit BVC-BLOCK */
|
|
tx = bssgp2_enc_bvc_block(bfp->bvci, bfp->block_cause);
|
|
fi_tx_sig(fi, tx);
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_BLOCKED, T1_SECS, T1);
|
|
break;
|
|
case BSSGP_BVCFSM_S_UNBLOCKED:
|
|
/* re-transmit BVC-UNBLOCK */
|
|
tx = bssgp2_enc_bvc_unblock(bfp->bvci);
|
|
fi_tx_sig(fi, tx);
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_UNBLOCKED, T1_SECS, T1);
|
|
break;
|
|
}
|
|
break;
|
|
case T2:
|
|
switch (fi->state) {
|
|
case BSSGP_BVCFSM_S_WAIT_RESET_ACK:
|
|
/* re-transmit BVC-RESET */
|
|
_tx_bvc_reset(fi, bfp->last_reset_cause);
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_WAIT_RESET_ACK, T2_SECS, T2);
|
|
break;
|
|
case BSSGP_BVCFSM_S_UNBLOCKED:
|
|
/* re-transmit BVC-RESET-ACK */
|
|
_tx_bvc_reset_ack(fi);
|
|
osmo_fsm_inst_state_chg(fi, BSSGP_BVCFSM_S_UNBLOCKED, T2_SECS, T2);
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
OSMO_ASSERT(0);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static const struct osmo_fsm_state bssgp_bvc_fsm_states[] = {
|
|
[BSSGP_BVCFSM_S_NULL] = {
|
|
/* initial state from which we must do a RESET */
|
|
.name = "NULL",
|
|
.in_event_mask = 0,
|
|
.out_state_mask = S(BSSGP_BVCFSM_S_WAIT_RESET_ACK) |
|
|
S(BSSGP_BVCFSM_S_UNBLOCKED),
|
|
.action = bssgp_bvc_fsm_null,
|
|
},
|
|
[BSSGP_BVCFSM_S_BLOCKED] = {
|
|
.name = "BLOCKED",
|
|
.in_event_mask = S(BSSGP_BVCFSM_E_RX_UNBLOCK) |
|
|
S(BSSGP_BVCFSM_E_RX_BLOCK) |
|
|
S(BSSGP_BVCFSM_E_RX_BLOCK_ACK) |
|
|
S(BSSGP_BVCFSM_E_REQ_UNBLOCK),
|
|
.out_state_mask = S(BSSGP_BVCFSM_S_WAIT_RESET_ACK) |
|
|
S(BSSGP_BVCFSM_S_UNBLOCKED) |
|
|
S(BSSGP_BVCFSM_S_BLOCKED),
|
|
.action = bssgp_bvc_fsm_blocked,
|
|
.onenter = bssgp_bvc_fsm_blocked_onenter,
|
|
},
|
|
[BSSGP_BVCFSM_S_WAIT_RESET_ACK]= {
|
|
.name = "WAIT_RESET_ACK",
|
|
.in_event_mask = S(BSSGP_BVCFSM_E_RX_RESET_ACK) |
|
|
S(BSSGP_BVCFSM_E_RX_RESET),
|
|
.out_state_mask = S(BSSGP_BVCFSM_S_UNBLOCKED) |
|
|
S(BSSGP_BVCFSM_S_BLOCKED) |
|
|
S(BSSGP_BVCFSM_S_WAIT_RESET_ACK),
|
|
.action = bssgp_bvc_fsm_wait_reset_ack,
|
|
.onenter = _onenter_tail,
|
|
},
|
|
|
|
[BSSGP_BVCFSM_S_UNBLOCKED] = {
|
|
.name = "UNBLOCKED",
|
|
.in_event_mask = S(BSSGP_BVCFSM_E_RX_BLOCK) |
|
|
S(BSSGP_BVCFSM_E_RX_UNBLOCK) |
|
|
S(BSSGP_BVCFSM_E_RX_UNBLOCK_ACK) |
|
|
S(BSSGP_BVCFSM_E_REQ_BLOCK) |
|
|
S(BSSGP_BVCFSM_E_RX_FC_BVC) |
|
|
S(BSSGP_BVCFSM_E_RX_FC_BVC_ACK) |
|
|
S(BSSGP_BVCFSM_E_REQ_FC_BVC),
|
|
.out_state_mask = S(BSSGP_BVCFSM_S_BLOCKED) |
|
|
S(BSSGP_BVCFSM_S_WAIT_RESET_ACK) |
|
|
S(BSSGP_BVCFSM_S_UNBLOCKED),
|
|
.action = bssgp_bvc_fsm_unblocked,
|
|
.onenter = _onenter_tail,
|
|
},
|
|
};
|
|
|
|
static struct osmo_fsm bssgp_bvc_fsm = {
|
|
.name = "BSSGP-BVC",
|
|
.states = bssgp_bvc_fsm_states,
|
|
.num_states = ARRAY_SIZE(bssgp_bvc_fsm_states),
|
|
.allstate_event_mask = S(BSSGP_BVCFSM_E_REQ_RESET) |
|
|
S(BSSGP_BVCFSM_E_RX_RESET),
|
|
.allstate_action = bssgp_bvc_fsm_allstate,
|
|
.timer_cb = bssgp_bvc_fsm_timer_cb,
|
|
.log_subsys = DLBSSGP,
|
|
.event_names = ptp_bvc_event_names,
|
|
};
|
|
|
|
static struct osmo_fsm_inst *
|
|
_bvc_fsm_alloc(void *ctx, struct gprs_ns2_inst *nsi, bool role_sgsn, uint16_t nsei, uint16_t bvci)
|
|
{
|
|
struct osmo_fsm_inst *fi;
|
|
struct bvc_fsm_priv *bfp;
|
|
char idbuf[64];
|
|
|
|
/* TODO: encode our role in the id string? */
|
|
snprintf(idbuf, sizeof(idbuf), "NSE%05u-BVC%05u", nsei, bvci);
|
|
|
|
fi = osmo_fsm_inst_alloc(&bssgp_bvc_fsm, ctx, NULL, LOGL_INFO, idbuf);
|
|
if (!fi)
|
|
return NULL;
|
|
|
|
bfp = talloc_zero(fi, struct bvc_fsm_priv);
|
|
if (!bfp) {
|
|
osmo_fsm_inst_free(fi);
|
|
return NULL;
|
|
}
|
|
fi->priv = bfp;
|
|
|
|
bfp->nsi = nsi;
|
|
bfp->role_sgsn = role_sgsn;
|
|
bfp->nsei = nsei;
|
|
bfp->bvci = bvci;
|
|
bfp->max_pdu_len = UINT16_MAX;
|
|
|
|
return fi;
|
|
}
|
|
|
|
/*! Allocate a SIGNALING-BVC FSM for the BSS role (facing a remote SGSN).
|
|
* \param[in] ctx talloc context from which to allocate
|
|
* \param[in] nsi NS Instance on which this BVC operates
|
|
* \param[in] nsei NS Entity Identifier on which this BVC operates
|
|
* \param[in] features Feature [byte 0] and Extended Feature [byte 1] bitmap
|
|
* \returns newly-allocated FSM Instance; NULL in case of error */
|
|
struct osmo_fsm_inst *
|
|
bssgp_bvc_fsm_alloc_sig_bss(void *ctx, struct gprs_ns2_inst *nsi, uint16_t nsei, uint32_t features)
|
|
{
|
|
struct osmo_fsm_inst *fi = _bvc_fsm_alloc(ctx, nsi, false, nsei, 0);
|
|
struct bvc_fsm_priv *bfp;
|
|
|
|
if (!fi)
|
|
return NULL;
|
|
|
|
bfp = fi->priv;
|
|
bfp->features.advertised = features;
|
|
|
|
return fi;
|
|
}
|
|
|
|
/*! Allocate a PTP-BVC FSM for the BSS role (facing a remote SGSN).
|
|
* \param[in] ctx talloc context from which to allocate
|
|
* \param[in] nsi NS Instance on which this BVC operates
|
|
* \param[in] nsei NS Entity Identifier on which this BVC operates
|
|
* \param[in] bvci BVCI of this FSM
|
|
* \param[in] ra_id Routing Area Identity of the cell (reported to SGSN)
|
|
* \param[in] cell_id Cell Identifier of the cell (reported to SGSN)
|
|
* \returns newly-allocated FSM Instance; NULL in case of error */
|
|
struct osmo_fsm_inst *
|
|
bssgp_bvc_fsm_alloc_ptp_bss(void *ctx, struct gprs_ns2_inst *nsi, uint16_t nsei,
|
|
uint16_t bvci, const struct gprs_ra_id *ra_id, uint16_t cell_id)
|
|
{
|
|
struct osmo_fsm_inst *fi;
|
|
struct bvc_fsm_priv *bfp;
|
|
|
|
OSMO_ASSERT(bvci >= 2);
|
|
OSMO_ASSERT(ra_id);
|
|
|
|
fi = _bvc_fsm_alloc(ctx, nsi, false, nsei, bvci);
|
|
if (!fi)
|
|
return NULL;
|
|
|
|
bfp = fi->priv;
|
|
bfp->ra_id = *ra_id;
|
|
bfp->cell_id = cell_id;
|
|
|
|
return fi;
|
|
}
|
|
|
|
/*! Allocate a SIGNALING-BVC FSM for the SGSN role (facing a remote BSS).
|
|
* \param[in] ctx talloc context from which to allocate
|
|
* \param[in] nsi NS Instance on which this BVC operates
|
|
* \param[in] nsei NS Entity Identifier on which this BVC operates
|
|
* \param[in] features Feature [byte 0] and Extended Feature [byte 1] bitmap
|
|
* \returns newly-allocated FSM Instance; NULL in case of error */
|
|
struct osmo_fsm_inst *
|
|
bssgp_bvc_fsm_alloc_sig_sgsn(void *ctx, struct gprs_ns2_inst *nsi, uint16_t nsei, uint32_t features)
|
|
{
|
|
struct osmo_fsm_inst *fi = _bvc_fsm_alloc(ctx, nsi, true, nsei, 0);
|
|
struct bvc_fsm_priv *bfp;
|
|
|
|
if (!fi)
|
|
return NULL;
|
|
|
|
bfp = fi->priv;
|
|
bfp->features.advertised = features;
|
|
|
|
return fi;
|
|
}
|
|
|
|
/*! Allocate a PTP-BVC FSM for the SGSN role (facing a remote BSS).
|
|
* \param[in] ctx talloc context from which to allocate
|
|
* \param[in] nsi NS Instance on which this BVC operates
|
|
* \param[in] nsei NS Entity Identifier on which this BVC operates
|
|
* \param[in] bvci BVCI of this FSM
|
|
* \returns newly-allocated FSM Instance; NULL in case of error */
|
|
struct osmo_fsm_inst *
|
|
bssgp_bvc_fsm_alloc_ptp_sgsn(void *ctx, struct gprs_ns2_inst *nsi, uint16_t nsei, uint16_t bvci)
|
|
{
|
|
struct osmo_fsm_inst *fi;
|
|
|
|
OSMO_ASSERT(bvci >= 2);
|
|
|
|
fi = _bvc_fsm_alloc(ctx, nsi, true, nsei, bvci);
|
|
if (!fi)
|
|
return NULL;
|
|
|
|
return fi;
|
|
}
|
|
|
|
/*! Set the 'operations' callbacks + private data.
|
|
* \param[in] fi FSM instance for which the data shall be set
|
|
* \param[in] ops BSSGP BVC FSM operations (call-back functions) to register
|
|
* \param[in] ops_priv opaque/private data pointer passed through to call-backs */
|
|
void bssgp_bvc_fsm_set_ops(struct osmo_fsm_inst *fi, const struct bssgp_bvc_fsm_ops *ops, void *ops_priv)
|
|
{
|
|
struct bvc_fsm_priv *bfp = fi->priv;
|
|
|
|
OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
|
|
|
|
bfp->ops = ops;
|
|
bfp->ops_priv = ops_priv;
|
|
}
|
|
|
|
/*! Return if the given BVC FSM is in UNBLOCKED state. */
|
|
bool bssgp_bvc_fsm_is_unblocked(struct osmo_fsm_inst *fi)
|
|
{
|
|
return fi->state == BSSGP_BVCFSM_S_UNBLOCKED;
|
|
}
|
|
|
|
/*! Determine the cause value why given BVC FSM is blocked. */
|
|
uint8_t bssgp_bvc_fsm_get_block_cause(struct osmo_fsm_inst *fi)
|
|
{
|
|
struct bvc_fsm_priv *bfp = fi->priv;
|
|
|
|
OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
|
|
return bfp->block_cause;
|
|
}
|
|
|
|
/*! Return the advertised features / extended features. */
|
|
uint32_t bssgp_bvc_fsm_get_features_advertised(struct osmo_fsm_inst *fi)
|
|
{
|
|
struct bvc_fsm_priv *bfp = fi->priv;
|
|
|
|
OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
|
|
return bfp->features.advertised;
|
|
}
|
|
|
|
/*! Return the received features / extended features. */
|
|
uint32_t bssgp_bvc_fsm_get_features_received(struct osmo_fsm_inst *fi)
|
|
{
|
|
struct bvc_fsm_priv *bfp = fi->priv;
|
|
|
|
OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
|
|
return bfp->features.received;
|
|
}
|
|
|
|
/*! Return the negotiated features / extended features. */
|
|
uint32_t bssgp_bvc_fsm_get_features_negotiated(struct osmo_fsm_inst *fi)
|
|
{
|
|
struct bvc_fsm_priv *bfp = fi->priv;
|
|
|
|
OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
|
|
return bfp->features.negotiated;
|
|
}
|
|
|
|
/*! Set the maximum size of a BSSGP PDU.
|
|
*! On the NS layer this corresponds to the size of an NS SDU in NS-UNITDATA (3GPP TS 48.016 Ch. 9.2.10) */
|
|
void bssgp_bvc_fsm_set_max_pdu_len(struct osmo_fsm_inst *fi, uint16_t max_pdu_len) {
|
|
struct bvc_fsm_priv *bfp = fi->priv;
|
|
|
|
OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
|
|
bfp->max_pdu_len = max_pdu_len;
|
|
}
|
|
|
|
/*! Return the maximum size of a BSSGP PDU
|
|
*! On the NS layer this corresponds to the size of an NS SDU in NS-UNITDATA (3GPP TS 48.016 Ch. 9.2.10) */
|
|
uint16_t bssgp_bvc_fsm_get_max_pdu_len(const struct osmo_fsm_inst *fi)
|
|
{
|
|
const struct bvc_fsm_priv *bfp = fi->priv;
|
|
|
|
OSMO_ASSERT(fi->fsm == &bssgp_bvc_fsm);
|
|
return bfp->max_pdu_len;
|
|
}
|
|
|
|
|
|
static __attribute__((constructor)) void on_dso_load_bvc_fsm(void)
|
|
{
|
|
OSMO_ASSERT(osmo_fsm_register(&bssgp_bvc_fsm) == 0);
|
|
}
|