Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 1 | /* Copied from tbf.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <tbf.h> |
| 23 | #include <bts.h> |
| 24 | |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 25 | #include <stdio.h> |
| 26 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 27 | extern "C" { |
| 28 | #include <osmocom/core/msgb.h> |
| 29 | } |
| 30 | |
| 31 | /* reset LLC frame */ |
| 32 | void gprs_llc::reset() |
| 33 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 34 | m_index = 0; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 35 | m_length = 0; |
Holger Hans Peter Freyther | a42b2ad | 2013-11-26 16:39:47 +0100 | [diff] [blame] | 36 | |
| 37 | memset(frame, 0x42, sizeof(frame)); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | void gprs_llc::reset_frame_space() |
| 41 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 42 | m_index = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 43 | } |
| 44 | |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 45 | /* Put an Unconfirmed Information (UI) Dummy command, see GSM 44.064, 6.4.2.2 */ |
| 46 | void gprs_llc::put_dummy_frame(size_t req_len) |
| 47 | { |
| 48 | /* The shortest dummy command (the spec requests at least 6 octets) */ |
| 49 | static const uint8_t llc_dummy_command[] = { |
| 50 | 0x43, 0xc0, 0x01, 0x2b, 0x2b, 0x2b |
| 51 | }; |
Jacob Erlbeck | 3db617f | 2015-07-07 13:43:44 +0200 | [diff] [blame] | 52 | static const size_t max_dummy_command_len = 79; |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 53 | |
| 54 | put_frame(llc_dummy_command, sizeof(llc_dummy_command)); |
| 55 | |
| 56 | if (req_len > max_dummy_command_len) |
| 57 | req_len = max_dummy_command_len; |
| 58 | |
| 59 | /* Add further stuffing, if the requested length exceeds the minimum |
| 60 | * dummy command length */ |
| 61 | while (m_length < req_len) |
| 62 | frame[m_length++] = 0x2b; |
| 63 | } |
| 64 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 65 | void gprs_llc::put_frame(const uint8_t *data, size_t len) |
| 66 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 67 | /* only put frames when we are empty */ |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 68 | OSMO_ASSERT(m_index == 0 && m_length == 0); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 69 | append_frame(data, len); |
| 70 | } |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 71 | |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 72 | void gprs_llc::append_frame(const uint8_t *data, size_t len) |
| 73 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 74 | /* TODO: bounds check */ |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 75 | memcpy(frame + m_length, data, len); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 76 | m_length += len; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 77 | } |
| 78 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 79 | void gprs_llc::init() |
| 80 | { |
| 81 | reset(); |
| 82 | } |
| 83 | |
| 84 | bool gprs_llc::is_user_data_frame(uint8_t *data, size_t len) |
| 85 | { |
| 86 | if (len < 2) |
| 87 | return false; |
| 88 | |
| 89 | if ((data[0] & 0x0f) == 1 /* GPRS_SAPI_GMM */) |
| 90 | return false; |
| 91 | |
Jacob Erlbeck | d0aee85 | 2015-06-11 11:47:06 +0200 | [diff] [blame] | 92 | if ((data[0] & 0xe0) != 0xc0 /* LLC UI */) |
| 93 | /* It is not an LLC UI frame, see TS 44.064, 6.3 */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 94 | return false; |
| 95 | |
| 96 | return true; |
| 97 | } |
| 98 | |
| 99 | void gprs_llc_queue::init() |
| 100 | { |
| 101 | INIT_LLIST_HEAD(&m_queue); |
| 102 | m_queue_size = 0; |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 103 | m_queue_octets = 0; |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 104 | m_avg_queue_delay = 0; |
| 105 | } |
| 106 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 107 | void gprs_llc_queue::enqueue(struct msgb *llc_msg, const MetaInfo *info) |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 108 | { |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 109 | static const MetaInfo def_meta = {{0}}; |
| 110 | MetaInfo *meta_storage; |
| 111 | |
| 112 | osmo_static_assert(sizeof(*info) <= sizeof(llc_msg->cb), info_does_not_fit); |
| 113 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 114 | m_queue_size += 1; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 115 | m_queue_octets += msgb_length(llc_msg); |
| 116 | |
| 117 | meta_storage = (MetaInfo *)&llc_msg->cb[0]; |
| 118 | *meta_storage = info ? *info : def_meta; |
| 119 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 120 | msgb_enqueue(&m_queue, llc_msg); |
| 121 | } |
| 122 | |
| 123 | void gprs_llc_queue::clear(BTS *bts) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 124 | { |
| 125 | struct msgb *msg; |
| 126 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 127 | while ((msg = msgb_dequeue(&m_queue))) { |
| 128 | if (bts) |
| 129 | bts->llc_dropped_frame(); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 130 | msgb_free(msg); |
| 131 | } |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 132 | |
| 133 | m_queue_size = 0; |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 134 | m_queue_octets = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 135 | } |
| 136 | |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 137 | #define ALPHA 0.5f |
| 138 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 139 | struct msgb *gprs_llc_queue::dequeue(const MetaInfo **info) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 140 | { |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 141 | struct msgb *msg; |
| 142 | struct timeval *tv, tv_now, tv_result; |
| 143 | uint32_t lifetime; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 144 | const MetaInfo *meta_storage; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 145 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 146 | msg = msgb_dequeue(&m_queue); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 147 | if (!msg) |
| 148 | return NULL; |
| 149 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 150 | meta_storage = (MetaInfo *)&msg->cb[0]; |
| 151 | |
| 152 | if (info) |
| 153 | *info = meta_storage; |
| 154 | |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 155 | m_queue_size -= 1; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 156 | m_queue_octets -= msgb_length(msg); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 157 | |
| 158 | /* take the second time */ |
| 159 | gettimeofday(&tv_now, NULL); |
| 160 | tv = (struct timeval *)&msg->data[sizeof(*tv)]; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 161 | timersub(&tv_now, &meta_storage->recv_time, &tv_result); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 162 | |
| 163 | lifetime = tv_result.tv_sec*1000 + tv_result.tv_usec/1000; |
| 164 | m_avg_queue_delay = m_avg_queue_delay * ALPHA + lifetime * (1-ALPHA); |
| 165 | |
| 166 | return msg; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 167 | } |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 168 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 169 | void gprs_llc_queue::calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, struct timeval *tv) |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 170 | { |
| 171 | uint16_t delay_csec; |
| 172 | if (bts->bts_data()->force_llc_lifetime) |
| 173 | delay_csec = bts->bts_data()->force_llc_lifetime; |
| 174 | else |
| 175 | delay_csec = pdu_delay_csec; |
| 176 | |
Holger Hans Peter Freyther | 5a7f636 | 2013-11-21 21:59:32 +0100 | [diff] [blame] | 177 | /* keep timestamp at 0 for infinite delay */ |
Holger Hans Peter Freyther | 985fd11 | 2013-11-13 15:19:39 +0100 | [diff] [blame] | 178 | if (delay_csec == 0xffff) { |
| 179 | memset(tv, 0, sizeof(*tv)); |
| 180 | return; |
| 181 | } |
| 182 | |
| 183 | /* calculate timestamp of timeout */ |
Holger Hans Peter Freyther | 51e093b | 2013-11-13 15:35:45 +0100 | [diff] [blame] | 184 | struct timeval now, csec; |
| 185 | gettimeofday(&now, NULL); |
| 186 | csec.tv_usec = (delay_csec % 100) * 10000; |
| 187 | csec.tv_sec = delay_csec / 100; |
| 188 | |
| 189 | timeradd(&now, &csec, tv); |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 190 | } |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 191 | |
Jacob Erlbeck | 1e50a3d | 2015-06-16 10:18:42 +0200 | [diff] [blame] | 192 | bool gprs_llc_queue::is_frame_expired(const struct timeval *tv_now, |
| 193 | const struct timeval *tv) |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 194 | { |
| 195 | /* Timeout is infinite */ |
| 196 | if (tv->tv_sec == 0 && tv->tv_usec == 0) |
| 197 | return false; |
| 198 | |
| 199 | return timercmp(tv_now, tv, >); |
| 200 | } |