| /* |
| * Copyright (C) 2013 by Holger Hans Peter Freyther |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #pragma once |
| |
| extern "C" { |
| #include <osmocom/core/linuxlist.h> |
| } |
| |
| #include <stdint.h> |
| #include <string.h> |
| #include <sys/time.h> |
| |
| #define LLC_MAX_LEN 1543 |
| |
| struct BTS; |
| |
| /** |
| * I represent the LLC data to a MS |
| */ |
| struct gprs_llc { |
| static bool is_user_data_frame(uint8_t *data, size_t len); |
| |
| void init(); |
| void reset(); |
| void reset_frame_space(); |
| |
| void put_frame(const uint8_t *data, size_t len); |
| void put_dummy_frame(size_t req_len); |
| void append_frame(const uint8_t *data, size_t len); |
| |
| void consume(size_t len); |
| void consume(uint8_t *data, size_t len); |
| |
| uint16_t chunk_size() const; |
| uint16_t remaining_space() const; |
| uint16_t frame_length() const; |
| |
| bool fits_in_current_frame(uint8_t size) const; |
| |
| uint8_t frame[LLC_MAX_LEN]; /* current DL or UL frame */ |
| uint16_t m_index; /* current write/read position of frame */ |
| uint16_t m_length; /* len of current DL LLC_frame, 0 == no frame */ |
| }; |
| |
| /** |
| * I store the LLC frames that come from the SGSN. |
| */ |
| struct gprs_llc_queue { |
| struct MetaInfo { |
| struct timeval recv_time; |
| struct timeval expire_time; |
| }; |
| |
| static void calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, |
| struct timeval *tv); |
| static bool is_frame_expired(const struct timeval *now, |
| const struct timeval *tv); |
| static bool is_user_data_frame(uint8_t *data, size_t len); |
| |
| void init(); |
| |
| void enqueue(struct msgb *llc_msg, const MetaInfo *info = 0); |
| struct msgb *dequeue(const MetaInfo **info = 0); |
| void clear(BTS *bts); |
| void move_and_merge(gprs_llc_queue *o); |
| size_t size() const; |
| size_t octets() const; |
| |
| private: |
| uint32_t m_avg_queue_delay; /* Average delay of data going through the queue */ |
| size_t m_queue_size; |
| size_t m_queue_octets; |
| struct llist_head m_queue; /* queued LLC DL data */ |
| |
| }; |
| |
| |
| inline uint16_t gprs_llc::chunk_size() const |
| { |
| return m_length - m_index; |
| } |
| |
| inline uint16_t gprs_llc::remaining_space() const |
| { |
| return LLC_MAX_LEN - m_length; |
| } |
| |
| inline uint16_t gprs_llc::frame_length() const |
| { |
| return m_length; |
| } |
| |
| inline void gprs_llc::consume(size_t len) |
| { |
| m_index += len; |
| } |
| |
| inline void gprs_llc::consume(uint8_t *data, size_t len) |
| { |
| /* copy and increment index */ |
| memcpy(data, frame + m_index, len); |
| consume(len); |
| } |
| |
| inline bool gprs_llc::fits_in_current_frame(uint8_t chunk_size) const |
| { |
| return m_length + chunk_size <= LLC_MAX_LEN; |
| } |
| |
| inline size_t gprs_llc_queue::size() const |
| { |
| return m_queue_size; |
| } |
| |
| inline size_t gprs_llc_queue::octets() const |
| { |
| return m_queue_octets; |
| } |