Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1 | /* |
Vadim Yanitskiy | 999a593 | 2023-05-18 17:22:26 +0700 | [diff] [blame] | 2 | * (C) 2019 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 3 | * All Rights Reserved |
| 4 | * |
| 5 | * SPDX-License-Identifier: AGPL-3.0+ |
| 6 | * |
| 7 | * Author: Neels Hofmeyr |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU Affero General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 21 | */ |
| 22 | |
| 23 | #include <osmocom/core/logging.h> |
| 24 | |
| 25 | #include <osmocom/sccp/sccp_types.h> |
| 26 | #include <osmocom/sigtran/sccp_sap.h> |
| 27 | #include <osmocom/sigtran/sccp_helpers.h> |
| 28 | |
| 29 | #include <osmocom/msc/debug.h> |
| 30 | #include <osmocom/msc/sccp_ran.h> |
| 31 | #include <osmocom/msc/ran_infra.h> |
| 32 | |
| 33 | struct osmo_tdef g_sccp_tdefs[] = { |
| 34 | {} |
| 35 | }; |
| 36 | |
| 37 | static int sccp_ran_sap_up(struct osmo_prim_hdr *oph, void *_scu); |
| 38 | |
| 39 | struct sccp_ran_inst *sccp_ran_init(void *talloc_ctx, struct osmo_sccp_instance *sccp, enum osmo_sccp_ssn ssn, |
| 40 | const char *sccp_user_name, struct ran_infra *ran, void *user_data) |
| 41 | { |
| 42 | struct sccp_ran_inst *sri = talloc(talloc_ctx, struct sccp_ran_inst); |
| 43 | *sri = (struct sccp_ran_inst){ |
| 44 | .ran = ran, |
| 45 | .sccp = sccp, |
| 46 | .user_data = user_data, |
| 47 | }; |
| 48 | |
| 49 | INIT_LLIST_HEAD(&sri->ran_peers); |
| 50 | INIT_LLIST_HEAD(&sri->ran_conns); |
| 51 | |
| 52 | osmo_sccp_local_addr_by_instance(&sri->local_sccp_addr, sccp, ssn); |
| 53 | sri->scu = osmo_sccp_user_bind(sccp, sccp_user_name, sccp_ran_sap_up, ssn); |
| 54 | osmo_sccp_user_set_priv(sri->scu, sri); |
| 55 | |
| 56 | OSMO_ASSERT(!ran->sri); |
| 57 | ran->sri = sri; |
| 58 | |
| 59 | return sri; |
| 60 | } |
| 61 | |
| 62 | static int sccp_ran_sap_up(struct osmo_prim_hdr *oph, void *_scu) |
| 63 | { |
| 64 | struct osmo_sccp_user *scu = _scu; |
| 65 | struct sccp_ran_inst *sri = osmo_sccp_user_get_priv(scu); |
| 66 | struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph; |
| 67 | struct osmo_sccp_addr *my_addr; |
| 68 | struct osmo_sccp_addr *peer_addr; |
| 69 | uint32_t conn_id; |
| 70 | int rc; |
| 71 | |
| 72 | if (!sri->ran || !sri->ran->sccp_ran_ops.up_l2) { |
| 73 | LOG_SCCP_RAN_CL(sri, NULL, LOGL_ERROR, "This RAN type is not set up\n"); |
| 74 | msgb_free(oph->msg); |
| 75 | return -1; |
| 76 | } |
| 77 | |
| 78 | switch (OSMO_PRIM_HDR(oph)) { |
| 79 | case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_INDICATION): |
| 80 | /* indication of new inbound connection request */ |
| 81 | conn_id = prim->u.connect.conn_id; |
| 82 | my_addr = &prim->u.connect.called_addr; |
| 83 | peer_addr = &prim->u.connect.calling_addr; |
| 84 | LOG_SCCP_RAN_CO(sri, peer_addr, conn_id, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph)); |
| 85 | |
| 86 | if (!msgb_l2(oph->msg) || msgb_l2len(oph->msg) == 0) { |
| 87 | LOG_SCCP_RAN_CO(sri, peer_addr, conn_id, LOGL_NOTICE, "Received invalid N-CONNECT.ind\n"); |
| 88 | rc = -1; |
| 89 | break; |
| 90 | } |
| 91 | |
| 92 | if (osmo_sccp_addr_ri_cmp(&sri->local_sccp_addr, my_addr)) |
| 93 | LOG_SCCP_RAN_CO(sri, NULL, conn_id, LOGL_INFO, |
| 94 | "Called address is %s which is not the locally configured address\n", |
| 95 | osmo_sccp_inst_addr_name(sri->sccp, my_addr)); |
| 96 | |
| 97 | /* ensure the local SCCP socket is ACTIVE */ |
| 98 | osmo_sccp_tx_conn_resp(scu, conn_id, my_addr, NULL, 0); |
| 99 | |
| 100 | rc = sri->ran->sccp_ran_ops.up_l2(sri, peer_addr, true, conn_id, oph->msg); |
| 101 | if (rc) |
| 102 | osmo_sccp_tx_disconn(scu, conn_id, my_addr, SCCP_RETURN_CAUSE_UNQUALIFIED); |
| 103 | break; |
| 104 | |
| 105 | case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION): |
| 106 | /* connection-oriented data received */ |
| 107 | conn_id = prim->u.data.conn_id; |
| 108 | LOG_SCCP_RAN_CO(sri, NULL, conn_id, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph)); |
| 109 | |
| 110 | rc = sri->ran->sccp_ran_ops.up_l2(sri, NULL, true, conn_id, oph->msg); |
| 111 | break; |
| 112 | |
| 113 | case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION): |
| 114 | /* indication of disconnect */ |
| 115 | conn_id = prim->u.disconnect.conn_id; |
| 116 | LOG_SCCP_RAN_CO(sri, NULL, conn_id, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph)); |
| 117 | |
| 118 | /* If there is no L2 payload in the N-DISCONNECT, no need to dispatch up_l2(). */ |
| 119 | if (msgb_l2len(oph->msg)) |
| 120 | rc = sri->ran->sccp_ran_ops.up_l2(sri, NULL, true, conn_id, oph->msg); |
| 121 | else |
| 122 | rc = 0; |
| 123 | |
| 124 | /* Make sure the ran_conn is dropped. It might seem more optimal to combine the disconnect() into |
| 125 | * up_l2(), but since an up_l2() dispatch might already cause the ran_conn to be discarded for other |
| 126 | * reasons, a separate disconnect() with a separate conn_id lookup is actually necessary. */ |
| 127 | sri->ran->sccp_ran_ops.disconnect(sri, conn_id); |
| 128 | break; |
| 129 | |
| 130 | case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION): |
| 131 | /* connection-less data received */ |
| 132 | my_addr = &prim->u.unitdata.called_addr; |
| 133 | peer_addr = &prim->u.unitdata.calling_addr; |
| 134 | LOG_SCCP_RAN_CL(sri, peer_addr, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph)); |
| 135 | |
| 136 | if (osmo_sccp_addr_ri_cmp(&sri->local_sccp_addr, my_addr)) |
| 137 | LOG_SCCP_RAN_CL(sri, NULL, LOGL_INFO, |
| 138 | "Called address is %s which is not the locally configured address\n", |
| 139 | osmo_sccp_inst_addr_name(sri->sccp, my_addr)); |
| 140 | |
| 141 | rc = sri->ran->sccp_ran_ops.up_l2(sri, peer_addr, false, 0, oph->msg); |
| 142 | break; |
| 143 | |
| 144 | default: |
| 145 | LOG_SCCP_RAN_CL(sri, NULL, LOGL_DEBUG, "%s(%s)\n", __func__, osmo_scu_prim_name(oph)); |
| 146 | rc = -1; |
| 147 | break; |
| 148 | } |
| 149 | |
| 150 | msgb_free(oph->msg); |
| 151 | return rc; |
| 152 | } |
| 153 | |
| 154 | /* Push some padding if necessary to reach a multiple-of-eight offset to be msgb_push() an osmo_scu_prim that will then |
| 155 | * be 8-byte aligned. */ |
| 156 | static void msgb_pad_mod8(struct msgb *msg) |
| 157 | { |
| 158 | uint8_t mod8 = (intptr_t)(msg->data) % 8; |
| 159 | if (mod8) |
| 160 | msgb_push(msg, mod8); |
| 161 | } |
| 162 | |
| 163 | int sccp_ran_down_l2_co_initial(struct sccp_ran_inst *sri, |
| 164 | const struct osmo_sccp_addr *called_addr, |
| 165 | uint32_t conn_id, struct msgb *l2) |
| 166 | { |
| 167 | struct osmo_scu_prim *prim; |
| 168 | |
| 169 | l2->l2h = l2->data; |
| 170 | |
| 171 | msgb_pad_mod8(l2); |
| 172 | prim = (struct osmo_scu_prim *) msgb_push(l2, sizeof(*prim)); |
| 173 | prim->u.connect = (struct osmo_scu_connect_param){ |
| 174 | .called_addr = *called_addr, |
| 175 | .calling_addr = sri->local_sccp_addr, |
| 176 | .sccp_class = 2, |
| 177 | //.importance = ?, |
| 178 | .conn_id = conn_id, |
| 179 | }; |
| 180 | osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_REQUEST, l2); |
| 181 | return osmo_sccp_user_sap_down_nofree(sri->scu, &prim->oph); |
| 182 | } |
| 183 | |
| 184 | int sccp_ran_down_l2_co(struct sccp_ran_inst *sri, uint32_t conn_id, struct msgb *l2) |
| 185 | { |
| 186 | struct osmo_scu_prim *prim; |
| 187 | |
| 188 | l2->l2h = l2->data; |
| 189 | |
| 190 | msgb_pad_mod8(l2); |
| 191 | prim = (struct osmo_scu_prim *) msgb_push(l2, sizeof(*prim)); |
| 192 | prim->u.data.conn_id = conn_id; |
| 193 | osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_DATA, PRIM_OP_REQUEST, l2); |
| 194 | return osmo_sccp_user_sap_down_nofree(sri->scu, &prim->oph); |
| 195 | } |
| 196 | |
| 197 | int sccp_ran_down_l2_cl(struct sccp_ran_inst *sri, const struct osmo_sccp_addr *called_addr, struct msgb *l2) |
| 198 | { |
| 199 | struct osmo_scu_prim *prim; |
| 200 | |
| 201 | l2->l2h = l2->data; |
| 202 | |
| 203 | msgb_pad_mod8(l2); |
| 204 | prim = (struct osmo_scu_prim *) msgb_push(l2, sizeof(*prim)); |
| 205 | prim->u.unitdata = (struct osmo_scu_unitdata_param){ |
| 206 | .called_addr = *called_addr, |
| 207 | .calling_addr = sri->local_sccp_addr, |
| 208 | }; |
| 209 | osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_REQUEST, l2); |
| 210 | return osmo_sccp_user_sap_down_nofree(sri->scu, &prim->oph); |
| 211 | } |
| 212 | |
| 213 | int sccp_ran_disconnect(struct sccp_ran_inst *sri, uint32_t conn_id, uint32_t cause) |
| 214 | { |
| 215 | return osmo_sccp_tx_disconn(sri->scu, conn_id, NULL, cause); |
| 216 | } |