Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 1 | /* GSM 08.08 like API for OpenBSC. The bridge from MSC to BSC */ |
| 2 | |
| 3 | /* (C) 2010 by Holger Hans Peter Freyther |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 4 | * (C) 2010 by On Waves |
Holger Hans Peter Freyther | a7d3e8e | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 5 | * (C) 2009 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 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 General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <openbsc/bsc_api.h> |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 26 | #include <openbsc/bsc_rll.h> |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 27 | #include <openbsc/gsm_data.h> |
| 28 | #include <openbsc/signal.h> |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 29 | #include <openbsc/abis_rsl.h> |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 30 | #include <openbsc/chan_alloc.h> |
Holger Hans Peter Freyther | df5f724 | 2010-06-30 12:58:14 +0800 | [diff] [blame] | 31 | #include <openbsc/handover.h> |
Holger Hans Peter Freyther | 0e77ba2 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 32 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 33 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 34 | #include <osmocore/talloc.h> |
| 35 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 36 | static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind); |
| 37 | static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id); |
| 38 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 39 | int bsc_api_init(struct gsm_network *network, struct bsc_api *api) |
| 40 | { |
| 41 | network->bsc_api = api; |
| 42 | return 0; |
| 43 | } |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 44 | |
| 45 | int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn, |
| 46 | struct msgb *msg, int link_id) |
| 47 | { |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 48 | uint8_t sapi = link_id & 0x7; |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 49 | msg->lchan = conn->lchan; |
| 50 | msg->trx = msg->lchan->ts->trx; |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 51 | |
Holger Hans Peter Freyther | a76bcb0 | 2010-06-17 17:48:13 +0800 | [diff] [blame] | 52 | msg->l3h = msg->data; |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 53 | if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) { |
| 54 | OBSC_LINKID_CB(msg) = link_id; |
| 55 | if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) { |
| 56 | msgb_free(msg); |
| 57 | send_sapi_reject(conn, link_id); |
| 58 | return -1; |
| 59 | } |
| 60 | return 0; |
| 61 | } else { |
| 62 | return rsl_data_request(msg, link_id); |
| 63 | } |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 64 | } |
Holger Hans Peter Freyther | a7d3e8e | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 65 | |
Holger Hans Peter Freyther | 897ad9a | 2010-06-16 14:10:45 +0800 | [diff] [blame] | 66 | int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len, |
| 67 | uint8_t *mi, int chan_type) |
| 68 | { |
| 69 | return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type); |
| 70 | } |
| 71 | |
Holger Hans Peter Freyther | a7d3e8e | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 72 | /* dequeue messages to layer 4 */ |
| 73 | int bsc_upqueue(struct gsm_network *net) |
| 74 | { |
| 75 | struct gsm_mncc *mncc; |
| 76 | struct msgb *msg; |
| 77 | int work = 0; |
| 78 | |
| 79 | if (net) |
| 80 | while ((msg = msgb_dequeue(&net->upqueue))) { |
| 81 | mncc = (struct gsm_mncc *)msg->data; |
| 82 | if (net->mncc_recv) |
| 83 | net->mncc_recv(net, mncc->msg_type, mncc); |
| 84 | work = 1; /* work done */ |
| 85 | talloc_free(msg); |
| 86 | } |
| 87 | |
| 88 | return work; |
| 89 | } |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 90 | |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 91 | int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id) |
| 92 | { |
| 93 | int rc; |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 94 | struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api; |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 95 | struct gsm_lchan *lchan; |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 96 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 97 | lchan = msg->lchan; |
Holger Hans Peter Freyther | 0e77ba2 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 98 | if (lchan->state != LCHAN_S_ACTIVE) { |
| 99 | LOGP(DRSL, LOGL_ERROR, "Got data in non active state. discarding.\n"); |
| 100 | return -1; |
| 101 | } |
| 102 | |
| 103 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 104 | if (lchan->conn) { |
| 105 | api->dtap(lchan->conn, msg); |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 106 | } else { |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 107 | rc = BSC_API_CONN_POL_REJECT; |
| 108 | lchan->conn = subscr_con_allocate(msg->lchan); |
| 109 | |
| 110 | if (lchan->conn) |
| 111 | rc = api->compl_l3(lchan->conn, msg, 0); |
| 112 | |
| 113 | if (rc != BSC_API_CONN_POL_ACCEPT) { |
| 114 | subscr_con_free(lchan->conn); |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 115 | lchan_release(lchan, 0, 0); |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 116 | } |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 122 | int gsm0808_clear(struct gsm_subscriber_connection* conn) |
| 123 | { |
Holger Hans Peter Freyther | 8a945c8 | 2010-06-30 12:17:35 +0800 | [diff] [blame] | 124 | struct gsm_lchan *lchan; |
| 125 | |
Holger Hans Peter Freyther | df5f724 | 2010-06-30 12:58:14 +0800 | [diff] [blame] | 126 | bsc_clear_handover(conn); |
| 127 | |
Holger Hans Peter Freyther | 8a945c8 | 2010-06-30 12:17:35 +0800 | [diff] [blame] | 128 | lchan = conn->lchan; |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 129 | subscr_con_free(conn); |
Holger Hans Peter Freyther | 8a945c8 | 2010-06-30 12:17:35 +0800 | [diff] [blame] | 130 | lchan_release(lchan, 1, 0); |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 131 | return 0; |
| 132 | } |
| 133 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 134 | static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id) |
| 135 | { |
| 136 | struct bsc_api *api; |
| 137 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 138 | if (!conn) |
| 139 | return; |
| 140 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 141 | api = conn->bts->network->bsc_api; |
| 142 | if (!api || !api->sapi_n_reject) |
| 143 | return; |
| 144 | |
| 145 | api->sapi_n_reject(conn, link_id); |
| 146 | } |
| 147 | |
| 148 | static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind) |
| 149 | { |
| 150 | struct msgb *msg = _data; |
| 151 | |
| 152 | switch (rllr_ind) { |
| 153 | case BSC_RLLR_IND_EST_CONF: |
| 154 | rsl_data_request(msg, OBSC_LINKID_CB(msg)); |
| 155 | break; |
| 156 | case BSC_RLLR_IND_REL_IND: |
| 157 | case BSC_RLLR_IND_ERR_IND: |
| 158 | case BSC_RLLR_IND_TIMEOUT: |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 159 | send_sapi_reject(lchan->conn, OBSC_LINKID_CB(msg)); |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 160 | msgb_free(msg); |
| 161 | break; |
| 162 | } |
| 163 | } |
| 164 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 165 | static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal, |
| 166 | void *handler_data, void *signal_data) |
| 167 | { |
| 168 | struct bsc_api *bsc; |
| 169 | struct gsm_lchan *lchan; |
| 170 | |
| 171 | if (subsys != SS_LCHAN || signal != S_LCHAN_UNEXPECTED_RELEASE) |
| 172 | return 0; |
| 173 | |
| 174 | lchan = (struct gsm_lchan *)signal_data; |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 175 | if (!lchan || !lchan->conn) |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 176 | return 0; |
| 177 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 178 | bsc = lchan->ts->trx->bts->network->bsc_api; |
| 179 | if (!bsc || !bsc->clear_request) |
| 180 | return 0; |
| 181 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 182 | bsc->clear_request(lchan->conn, 0); |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 183 | subscr_con_free(lchan->conn); |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static __attribute__((constructor)) void on_dso_load_bsc(void) |
| 188 | { |
| 189 | register_signal_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL); |
Holger Hans Peter Freyther | b2f49a5 | 2010-06-15 11:20:24 +0800 | [diff] [blame] | 190 | } |