Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #pragma once |
| 20 | |
Jacob Erlbeck | 1eae96c | 2015-06-15 11:19:13 +0200 | [diff] [blame] | 21 | extern "C" { |
| 22 | #include <osmocom/core/linuxlist.h> |
| 23 | } |
| 24 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 25 | #include <stdint.h> |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 26 | #include <string.h> |
Jacob Erlbeck | e500e2e | 2015-06-29 09:32:46 +0200 | [diff] [blame] | 27 | #include <sys/time.h> |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 28 | |
| 29 | #define LLC_MAX_LEN 1543 |
| 30 | |
Jacob Erlbeck | 1d0a52a | 2015-06-02 11:28:07 +0200 | [diff] [blame] | 31 | struct BTS; |
| 32 | struct timeval; |
| 33 | struct msgb; |
| 34 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 35 | /** |
| 36 | * I represent the LLC data to a MS |
| 37 | */ |
| 38 | struct gprs_llc { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 39 | static bool is_user_data_frame(uint8_t *data, size_t len); |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 40 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 41 | void init(); |
| 42 | void reset(); |
| 43 | void reset_frame_space(); |
| 44 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 45 | void put_frame(const uint8_t *data, size_t len); |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 46 | void put_dummy_frame(size_t req_len); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 47 | void append_frame(const uint8_t *data, size_t len); |
| 48 | |
| 49 | void consume(size_t len); |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 50 | void consume(uint8_t *data, size_t len); |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 51 | |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 52 | uint16_t chunk_size() const; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 53 | uint16_t remaining_space() const; |
| 54 | uint16_t frame_length() const; |
| 55 | |
| 56 | bool fits_in_current_frame(uint8_t size) const; |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 57 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 58 | uint8_t frame[LLC_MAX_LEN]; /* current DL or UL frame */ |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 59 | uint16_t m_index; /* current write/read position of frame */ |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 60 | uint16_t m_length; /* len of current DL LLC_frame, 0 == no frame */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 61 | }; |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 62 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 63 | /** |
| 64 | * I store the LLC frames that come from the SGSN. |
| 65 | */ |
| 66 | struct gprs_llc_queue { |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 67 | struct MetaInfo { |
| 68 | struct timeval recv_time; |
| 69 | struct timeval expire_time; |
| 70 | }; |
| 71 | |
Jacob Erlbeck | 1e50a3d | 2015-06-16 10:18:42 +0200 | [diff] [blame] | 72 | static void calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, |
| 73 | struct timeval *tv); |
| 74 | static bool is_frame_expired(const struct timeval *now, |
| 75 | const struct timeval *tv); |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 76 | static bool is_user_data_frame(uint8_t *data, size_t len); |
| 77 | |
| 78 | void init(); |
| 79 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 80 | void enqueue(struct msgb *llc_msg, const MetaInfo *info = 0); |
| 81 | struct msgb *dequeue(const MetaInfo **info = 0); |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 82 | void clear(BTS *bts); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 83 | void move_and_merge(gprs_llc_queue *o); |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 84 | size_t size() const; |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 85 | size_t octets() const; |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 86 | |
| 87 | private: |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 88 | uint32_t m_avg_queue_delay; /* Average delay of data going through the queue */ |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 89 | size_t m_queue_size; |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 90 | size_t m_queue_octets; |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 91 | struct llist_head m_queue; /* queued LLC DL data */ |
| 92 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 93 | }; |
| 94 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 95 | |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 96 | inline uint16_t gprs_llc::chunk_size() const |
| 97 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 98 | return m_length - m_index; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | inline uint16_t gprs_llc::remaining_space() const |
| 102 | { |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 103 | return LLC_MAX_LEN - m_length; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | inline uint16_t gprs_llc::frame_length() const |
| 107 | { |
| 108 | return m_length; |
| 109 | } |
| 110 | |
| 111 | inline void gprs_llc::consume(size_t len) |
| 112 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 113 | m_index += len; |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | inline void gprs_llc::consume(uint8_t *data, size_t len) |
| 117 | { |
| 118 | /* copy and increment index */ |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 119 | memcpy(data, frame + m_index, len); |
| 120 | consume(len); |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 121 | } |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 122 | |
| 123 | inline bool gprs_llc::fits_in_current_frame(uint8_t chunk_size) const |
| 124 | { |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 125 | return m_length + chunk_size <= LLC_MAX_LEN; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 126 | } |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 127 | |
| 128 | inline size_t gprs_llc_queue::size() const |
| 129 | { |
| 130 | return this ? m_queue_size : 0; |
| 131 | } |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 132 | |
| 133 | inline size_t gprs_llc_queue::octets() const |
| 134 | { |
| 135 | return this ? m_queue_octets : 0; |
| 136 | } |