Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 1 | /* gprs_ms.cpp |
| 2 | * |
| 3 | * Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH |
| 4 | * Author: Jacob Erlbeck <jerlbeck@sysmocom.de> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version 2 |
| 9 | * of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | */ |
| 20 | |
| 21 | |
| 22 | #include "gprs_ms.h" |
| 23 | |
| 24 | #include "tbf.h" |
| 25 | #include "gprs_debug.h" |
| 26 | |
| 27 | extern "C" { |
| 28 | #include <osmocom/core/talloc.h> |
| 29 | #include <osmocom/core/utils.h> |
| 30 | } |
| 31 | |
| 32 | extern void *tall_pcu_ctx; |
| 33 | |
| 34 | struct GprsMsDefaultCallback: public GprsMs::Callback { |
| 35 | virtual void ms_idle(class GprsMs *ms) { |
| 36 | delete ms; |
| 37 | } |
| 38 | virtual void ms_active(class GprsMs *) {} |
| 39 | }; |
| 40 | |
| 41 | static GprsMsDefaultCallback gprs_default_cb; |
| 42 | |
| 43 | |
| 44 | GprsMs::Guard::Guard(GprsMs *ms) : m_ms(ms) |
| 45 | { |
| 46 | if (m_ms) |
| 47 | m_ms->ref(); |
| 48 | } |
| 49 | |
| 50 | GprsMs::Guard::~Guard() |
| 51 | { |
| 52 | if (m_ms) |
| 53 | m_ms->unref(); |
| 54 | } |
| 55 | |
| 56 | GprsMs::GprsMs(uint32_t tlli) : |
| 57 | m_cb(&gprs_default_cb), |
| 58 | m_ul_tbf(NULL), |
| 59 | m_dl_tbf(NULL), |
| 60 | m_tlli(tlli), |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 61 | m_new_ul_tlli(0), |
| 62 | m_new_dl_tlli(0), |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame^] | 63 | m_ta(0), |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 64 | m_is_idle(true), |
Jacob Erlbeck | 5367086 | 2015-05-12 17:54:33 +0200 | [diff] [blame] | 65 | m_ref(0), |
| 66 | m_list(this) |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 67 | { |
| 68 | LOGP(DRLCMAC, LOGL_INFO, "Creating MS object, TLLI = 0x%08x\n", tlli); |
Jacob Erlbeck | b0e5eaf | 2015-05-21 11:07:16 +0200 | [diff] [blame] | 69 | |
| 70 | m_imsi[0] = 0; |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | GprsMs::~GprsMs() |
| 74 | { |
| 75 | LOGP(DRLCMAC, LOGL_INFO, "Destroying MS object, TLLI = 0x%08x\n", tlli()); |
Jacob Erlbeck | fecece0 | 2015-05-08 12:13:08 +0200 | [diff] [blame] | 76 | |
| 77 | if (m_ul_tbf) { |
| 78 | m_ul_tbf->set_ms(NULL); |
| 79 | m_ul_tbf = NULL; |
| 80 | } |
| 81 | |
| 82 | if (m_dl_tbf) { |
| 83 | m_dl_tbf->set_ms(NULL); |
| 84 | m_dl_tbf = NULL; |
| 85 | } |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | void* GprsMs::operator new(size_t size) |
| 89 | { |
| 90 | static void *tall_ms_ctx = NULL; |
| 91 | if (!tall_ms_ctx) |
| 92 | tall_ms_ctx = talloc_named_const(tall_pcu_ctx, 0, __PRETTY_FUNCTION__); |
| 93 | |
| 94 | return talloc_size(tall_ms_ctx, size); |
| 95 | } |
| 96 | |
| 97 | void GprsMs::operator delete(void* p) |
| 98 | { |
| 99 | talloc_free(p); |
| 100 | } |
| 101 | |
| 102 | void GprsMs::ref() |
| 103 | { |
| 104 | m_ref += 1; |
| 105 | } |
| 106 | |
| 107 | void GprsMs::unref() |
| 108 | { |
| 109 | OSMO_ASSERT(m_ref >= 0); |
| 110 | m_ref -= 1; |
| 111 | if (m_ref == 0) |
| 112 | update_status(); |
| 113 | } |
| 114 | |
| 115 | void GprsMs::attach_tbf(struct gprs_rlcmac_tbf *tbf) |
| 116 | { |
| 117 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 118 | attach_dl_tbf(static_cast<gprs_rlcmac_dl_tbf *>(tbf)); |
| 119 | else |
| 120 | attach_ul_tbf(static_cast<gprs_rlcmac_ul_tbf *>(tbf)); |
| 121 | } |
| 122 | |
| 123 | void GprsMs::attach_ul_tbf(struct gprs_rlcmac_ul_tbf *tbf) |
| 124 | { |
| 125 | if (m_ul_tbf == tbf) |
| 126 | return; |
| 127 | |
| 128 | LOGP(DRLCMAC, LOGL_INFO, "Attaching TBF to MS object, TLLI = 0x%08x, TBF = %s\n", |
| 129 | tlli(), tbf->name()); |
| 130 | |
| 131 | Guard guard(this); |
| 132 | |
| 133 | if (m_ul_tbf) |
| 134 | detach_tbf(m_ul_tbf); |
| 135 | |
| 136 | m_ul_tbf = tbf; |
| 137 | } |
| 138 | |
| 139 | void GprsMs::attach_dl_tbf(struct gprs_rlcmac_dl_tbf *tbf) |
| 140 | { |
| 141 | if (m_dl_tbf == tbf) |
| 142 | return; |
| 143 | |
| 144 | LOGP(DRLCMAC, LOGL_INFO, "Attaching TBF to MS object, TLLI = 0x%08x, TBF = %s\n", |
| 145 | tlli(), tbf->name()); |
| 146 | |
| 147 | Guard guard(this); |
| 148 | |
| 149 | if (m_dl_tbf) |
| 150 | detach_tbf(m_dl_tbf); |
| 151 | |
| 152 | m_dl_tbf = tbf; |
| 153 | } |
| 154 | |
| 155 | void GprsMs::detach_tbf(gprs_rlcmac_tbf *tbf) |
| 156 | { |
| 157 | if (m_ul_tbf && tbf == static_cast<gprs_rlcmac_tbf *>(m_ul_tbf)) |
| 158 | m_ul_tbf = NULL; |
| 159 | else if (m_dl_tbf && tbf == static_cast<gprs_rlcmac_tbf *>(m_dl_tbf)) |
| 160 | m_dl_tbf = NULL; |
| 161 | else |
| 162 | return; |
| 163 | |
| 164 | LOGP(DRLCMAC, LOGL_INFO, "Detaching TBF from MS object, TLLI = 0x%08x, TBF = %s\n", |
| 165 | tlli(), tbf->name()); |
| 166 | |
Jacob Erlbeck | fecece0 | 2015-05-08 12:13:08 +0200 | [diff] [blame] | 167 | if (tbf->ms() == this) |
| 168 | tbf->set_ms(NULL); |
| 169 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 170 | update_status(); |
| 171 | } |
| 172 | |
| 173 | void GprsMs::update_status() |
| 174 | { |
| 175 | if (m_ref > 0) |
| 176 | return; |
| 177 | |
| 178 | if (is_idle() && !m_is_idle) { |
| 179 | m_is_idle = true; |
| 180 | m_cb->ms_idle(this); |
| 181 | /* this can be deleted by now, do not access it */ |
| 182 | return; |
| 183 | } |
| 184 | |
| 185 | if (!is_idle() && m_is_idle) { |
| 186 | m_is_idle = false; |
| 187 | m_cb->ms_active(this); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | void GprsMs::set_tlli(uint32_t tlli) |
| 192 | { |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 193 | if (tlli == m_tlli || tlli == m_new_ul_tlli) |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 194 | return; |
| 195 | |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 196 | if (tlli != m_new_dl_tlli) { |
| 197 | LOGP(DRLCMAC, LOGL_INFO, |
| 198 | "Modifying MS object, UL TLLI: 0x%08x -> 0x%08x, " |
| 199 | "not yet confirmed\n", |
| 200 | this->tlli(), tlli); |
| 201 | m_new_ul_tlli = tlli; |
| 202 | return; |
| 203 | } |
| 204 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 205 | LOGP(DRLCMAC, LOGL_INFO, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 206 | "Modifying MS object, TLLI: 0x%08x -> 0x%08x, " |
| 207 | "already confirmed partly\n", |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 208 | m_tlli, tlli); |
| 209 | |
| 210 | m_tlli = tlli; |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 211 | m_new_dl_tlli = 0; |
| 212 | m_new_ul_tlli = 0; |
| 213 | } |
| 214 | |
| 215 | bool GprsMs::confirm_tlli(uint32_t tlli) |
| 216 | { |
| 217 | if (tlli == m_tlli || tlli == m_new_dl_tlli) |
| 218 | return false; |
| 219 | |
| 220 | if (tlli != m_new_ul_tlli) { |
| 221 | /* The MS has not sent a message with the new TLLI, which may |
| 222 | * happen according to the spec [TODO: add reference]. */ |
| 223 | |
| 224 | LOGP(DRLCMAC, LOGL_INFO, |
| 225 | "The MS object cannot fully confirm an unexpected TLLI: 0x%08x, " |
| 226 | "partly confirmed\n", tlli); |
| 227 | /* Use the network's idea of TLLI as candidate, this does not |
| 228 | * change the result value of tlli() */ |
| 229 | m_new_dl_tlli = tlli; |
| 230 | return false; |
| 231 | } |
| 232 | |
| 233 | LOGP(DRLCMAC, LOGL_INFO, |
| 234 | "Modifying MS object, TLLI: 0x%08x confirmed\n", tlli); |
| 235 | |
| 236 | m_tlli = tlli; |
| 237 | m_new_dl_tlli = 0; |
| 238 | m_new_ul_tlli = 0; |
| 239 | |
| 240 | return true; |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 241 | } |
Jacob Erlbeck | b0e5eaf | 2015-05-21 11:07:16 +0200 | [diff] [blame] | 242 | |
| 243 | void GprsMs::set_imsi(const char *imsi) |
| 244 | { |
| 245 | if (!imsi) { |
| 246 | LOGP(DRLCMAC, LOGL_ERROR, "Expected IMSI!\n"); |
| 247 | return; |
| 248 | } |
| 249 | |
| 250 | if (imsi[0] && strlen(imsi) < 3) { |
| 251 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI '%s'!\n", |
| 252 | imsi); |
| 253 | return; |
| 254 | } |
| 255 | |
| 256 | if (strcmp(imsi, m_imsi) == 0) |
| 257 | return; |
| 258 | |
| 259 | LOGP(DRLCMAC, LOGL_INFO, |
| 260 | "Modifying MS object, TLLI = 0x%08x, IMSI '%s' -> '%s'\n", |
| 261 | tlli(), m_imsi, imsi); |
| 262 | |
| 263 | strncpy(m_imsi, imsi, sizeof(m_imsi)); |
| 264 | m_imsi[sizeof(m_imsi) - 1] = '\0'; |
| 265 | } |
| 266 | |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame^] | 267 | void GprsMs::set_ta(uint8_t ta_) |
| 268 | { |
| 269 | if (ta_ == m_ta) |
| 270 | return; |
| 271 | |
| 272 | LOGP(DRLCMAC, LOGL_INFO, |
| 273 | "Modifying MS object, TLLI = 0x%08x, TA %d -> %d\n", |
| 274 | tlli(), m_ta, ta_); |
| 275 | |
| 276 | m_ta = ta_; |
| 277 | } |
| 278 | |