474 lines
14 KiB
C++
474 lines
14 KiB
C++
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/* Data block transfer
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <gprs_bssgp_pcu.h>
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#include <gprs_rlcmac.h>
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/* After receiving these framess, we send ack/nack. */
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#define ACK_AFTER_FRAMES 20
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extern "C" {
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/* TS 04.60 10.2.2 */
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struct rlc_dl_header {
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uint8_t r:1,
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si:1,
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cv:4,
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pt:2;
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uint8_t ti:1,
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tfi:5,
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pi:1,
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spare:1;
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uint8_t e:1,
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bsn:7;
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} __attribute__ ((packed));
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struct rlc_li_field {
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uint8_t e:1,
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m:1,
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li:6;
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} __attribute__ ((packed));
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}
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/* get TLLI from received UL data block */
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static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli)
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{
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struct rlc_dl_header *rh = (struct rlc_dl_header *)data;
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struct rlc_li_field *li;
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uint8_t e;
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if (!rh->ti)
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return -EINVAL;
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data += 3;
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len -= 3;
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e = rh->e;
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/* if E is not set (LI follows) */
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while (!e) {
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if (!len) {
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LOGP(DRLCMACDATA, LOGL_NOTICE, "UL DATA LI extended, "
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"but no more data\n");
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return -EINVAL;
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}
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/* get new E */
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li = (struct rlc_li_field *)data;
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if (li->e == 0) /* if LI==0, E is interpreted as '1' */
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e = 1;
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else
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e = li->e;
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data++;
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len--;
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}
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if (len < 4) {
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LOGP(DRLCMACDATA, LOGL_NOTICE, "UL DATA TLLI out of frame "
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"border\n");
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return -EINVAL;
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}
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*tlli = ntohl(*((uint32_t *)data));
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return 0;
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}
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/* Store received block data in LLC message(s) and forward to SGSN if complete.
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*/
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static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data,
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uint8_t len)
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{
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struct rlc_dl_header *rh = (struct rlc_dl_header *)data;
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uint8_t e, m;
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struct rlc_li_field *li;
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uint8_t frame_offset[16], offset = 0, chunk;
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int i, frames = 0;
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LOGP(DRLCMACDATA, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len);
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data += 3;
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len -= 3;
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e = rh->e; /* if extended */
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m = 1; /* more frames, that means: the first frame */
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/* Parse frame offsets from length indicator(s), if any. */
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while (1) {
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if (frames == (int)sizeof(frame_offset)) {
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LOGP(DRLCMACDATA, LOGL_ERROR, "Too many frames in "
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"block\n");
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return -EINVAL;
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}
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frame_offset[frames++] = offset;
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LOGP(DRLCMACDATA, LOGL_DEBUG, "-- Frame %d starts at offset "
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"%d\n", frames, offset);
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if (!len)
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break;
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/* M == 0 and E == 0 is not allowed in this version. */
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if (!m && !e) {
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LOGP(DRLCMACDATA, LOGL_NOTICE, "UL DATA TFI=%d "
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"ignored, because M='0' and E='0'.\n",
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tbf->tfi);
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return 0;
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}
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/* no more frames in this segment */
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if (e) {
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break;
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}
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/* There is a new frame and an LI that delimits it. */
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if (m) {
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li = (struct rlc_li_field *)data;
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/* Special case: LI == 0
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* If the last segment would fit precisely into the
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* rest of the RLC MAC block, there would be no way
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* to delimit that this segment ends and is not
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* continued in the next block.
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* The special LI (0) is used to force the segment to
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* extend into the next block, so it is delimited there.
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* This LI must be skipped. Also it is the last LI.
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*/
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if (li->li == 0) {
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data++;
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len--;
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m = 1; /* M is ignored, we know there is more */
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break; /* handle E as '1', so we break! */
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}
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e = li->e;
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m = li->m;
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offset += li->li;
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data++;
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len--;
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continue;
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}
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}
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if (!m) {
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LOGP(DRLCMACDATA, LOGL_DEBUG, "- Last frame carries spare "
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"data\n");
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}
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LOGP(DRLCMACDATA, LOGL_DEBUG, "- Data length after length fields: %d\n",
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len);
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if (rh->ti) {
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data += 4;
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len -= 4;
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LOGP(DRLCMACDATA, LOGL_DEBUG, "- Length after skipping TLLI: "
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"%d\n", len);
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}
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/* Now we have:
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* - a list of frames offsets: frame_offset[]
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* - number of frames: i
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* - m == 0: Last frame carries spare data (end of TBF).
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*/
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/* Check if last offset would exceed frame. */
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if (offset > len) {
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LOGP(DRLCMACDATA, LOGL_NOTICE, "UL DATA TFI=%d ignored, "
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"because LI exceeds frame length.\n", tbf->tfi);
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return -EINVAL;
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}
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/* create LLC frames */
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for (i = 0; i < frames; i++) {
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/* last frame ? */
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if (i == frames - 1) {
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/* no more data in last frame */
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if (!m)
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break;
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/* data until end of frame */
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chunk = len - frame_offset[i];
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} else {
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/* data until next frame */
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chunk = frame_offset[i + 1] - frame_offset[i];
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}
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LOGP(DRLCMACDATA, LOGL_DEBUG, "-- Appending chunk (len=%d) to "
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"frame at %d.\n", chunk, tbf->llc_index);
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if (tbf->llc_index + chunk > LLC_MAX_LEN) {
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LOGP(DRLCMACDATA, LOGL_NOTICE, "LLC frame exceeds "
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"maximum size.\n");
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chunk = LLC_MAX_LEN - tbf->llc_index;
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}
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memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i],
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chunk);
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tbf->llc_index += chunk;
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/* not last frame ? */
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if (i != frames - 1) {
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/* send frame to SGSN */
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LOGP(DRLCMACDATA, LOGL_INFO, "Complete UL frame for "
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"TFI=%d: %s\n", tbf->tfi,
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osmo_hexdump(tbf->llc_frame, tbf->llc_index));
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gprs_rlcmac_tx_ul_ud(tbf);
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tbf->llc_index = 0;
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}
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}
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return 0;
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}
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/* * generate uplink ack
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*/
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void write_packet_uplink_ack(bitvec * dest, struct gprs_rlcmac_tbf *tbf,
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uint8_t final)
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{
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// TODO We should use our implementation of encode RLC/MAC Control messages.
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unsigned wp = 0;
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uint16_t i, bbn;
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uint16_t mod_sns_half = (tbf->sns >> 1) - 1;
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char bit;
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LOGP(DRLCMACDATA, LOGL_DEBUG, "Sending Ack/Nack for TBF=%d "
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"(final=%d)\n", tbf->tfi, final);
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bitvec_write_field(dest, wp,0x1,2); // payload
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bitvec_write_field(dest, wp,0x0,2); // Uplink block with TDMA framenumber (N+13)
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bitvec_write_field(dest, wp,final,1); // Suppl/Polling Bit
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bitvec_write_field(dest, wp,0x0,3); // Uplink state flag
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//bitvec_write_field(dest, wp,0x0,1); // Reduced block sequence number
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//bitvec_write_field(dest, wp,BSN+6,5); // Radio transaction identifier
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//bitvec_write_field(dest, wp,0x1,1); // Final segment
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//bitvec_write_field(dest, wp,0x1,1); // Address control
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//bitvec_write_field(dest, wp,0x0,2); // Power reduction: 0
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//bitvec_write_field(dest, wp,TFI,5); // Temporary flow identifier
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//bitvec_write_field(dest, wp,0x1,1); // Direction
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bitvec_write_field(dest, wp,0x09,6); // MESSAGE TYPE
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bitvec_write_field(dest, wp,0x0,2); // Page Mode
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bitvec_write_field(dest, wp,0x0,2);
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bitvec_write_field(dest, wp,tbf->tfi,5); // Uplink TFI
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bitvec_write_field(dest, wp,0x0,1);
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bitvec_write_field(dest, wp,0x0,2); // CS1
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bitvec_write_field(dest, wp,final,1); // FINAL_ACK_INDICATION
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bitvec_write_field(dest, wp,tbf->dir.ul.v_r,7); // STARTING_SEQUENCE_NUMBER
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// RECEIVE_BLOCK_BITMAP
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LOGP(DRLCMACDATA, LOGL_DEBUG, "- ack bitmap: \"");
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for (i = 0, bbn = (tbf->dir.ul.v_r - 1) & mod_sns_half; i < 64;
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i++, bbn = (bbn - 1) & mod_sns_half) {
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bit = tbf->dir.ul.v_n[bbn];
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if (bit == 0)
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bit = ' ';
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LOGPC(DRLCMACDATA, LOGL_DEBUG, "%c", bit);
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bitvec_write_field(dest, wp,(bit == 'R'),1);
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}
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LOGPC(DRLCMACDATA, LOGL_DEBUG, "\"\n");
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bitvec_write_field(dest, wp,0x1,1); // CONTENTION_RESOLUTION_TLLI = present
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bitvec_write_field(dest, wp,tbf->tlli,8*4);
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bitvec_write_field(dest, wp,0x00,4); //spare
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bitvec_write_field(dest, wp,0x5,4); //0101
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}
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struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf,
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uint32_t fn)
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{
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int final = (tbf->state == GPRS_RLCMAC_FINISHED);
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struct msgb *msg;
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msg = msgb_alloc(23, "rlcmac_ul_ack");
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if (!msg)
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return NULL;
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bitvec *ack_vec = bitvec_alloc(23);
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if (!ack_vec) {
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msgb_free(msg);
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return NULL;
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}
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bitvec_unhex(ack_vec,
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"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
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write_packet_uplink_ack(ack_vec, tbf, final);
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bitvec_pack(ack_vec, msgb_put(msg, 23));
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bitvec_free(ack_vec);
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if (final) {
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if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED)
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LOGP(DRLCMACDATA, LOGL_ERROR, "Polling is already "
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"sheduled for TBF=%d\n", tbf->tfi);
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tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
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tbf->poll_fn = (fn + 13) % 2715648;
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tbf->dir.ul.substate = GPRS_RLCMAC_UL_WAIT_POLL;
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} else
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tbf->dir.ul.substate = GPRS_RLCMAC_UL_NONE;
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return msg;
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}
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/* receive UL data block
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*
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* The blocks are defragmented and forwarded as LLC frames, if complete.
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*/
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int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len)
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{
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struct gprs_rlcmac_tbf *tbf;
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struct rlc_dl_header *rh = (struct rlc_dl_header *)data;
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uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index;
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int rc;
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if (len < 23) {
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LOGP(DRLCMACDATA, LOGL_ERROR, "Dropping short frame "
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"(len = %d)\n", len);
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return -EINVAL;
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}
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/* find TBF inst from given TFI */
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tbf = tbf_by_tfi(rh->tfi);
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if (!tbf) {
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LOGP(DRLCMACDATA, LOGL_NOTICE, "UL DATA unknown TFI=%d\n",
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rh->tfi);
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return 0;
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}
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if (tbf->direction != GPRS_RLCMAC_UL_TBF) {
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LOGP(DRLCMACDATA, LOGL_NOTICE, "UL DATA TFI=%d not Uplink "
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"tbf\n", rh->tfi);
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return 0;
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}
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LOGP(DRLCMACDATA, LOGL_INFO, "UL DATA TFI=%d received (V(Q)=%d .. "
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"V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r);
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/* get TLLI */
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if (!tbf->tlli_valid) {
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/* no TLLI yet */
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if (!rh->ti) {
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|
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LOGP(DRLCMACDATA, LOGL_NOTICE, "UL DATA TFI=%d without "
|
||
|
|
"TLLI, but no TLLI received yet\n", rh->tfi);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
rc = tlli_from_ul_data(data, len, &tbf->tlli);
|
||
|
|
if (rc) {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_NOTICE, "Failed to decode TLLI "
|
||
|
|
"of UL DATA TFI=%d.\n", rh->tfi);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
tbf->tlli_valid = 1;
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, " Decoded premier TLLI=0x%08x of "
|
||
|
|
"UL DATA TFI=%d.\n", tbf->tlli, rh->tfi);
|
||
|
|
/* already have TLLI, but we stille get another one */
|
||
|
|
} else if (rh->ti) {
|
||
|
|
uint32_t tlli;
|
||
|
|
rc = tlli_from_ul_data(data, len, &tlli);
|
||
|
|
if (rc) {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_NOTICE, "Failed to decode TLLI "
|
||
|
|
"of UL DATA TFI=%d.\n", rh->tfi);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (tlli != tbf->tlli) {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_NOTICE, "TLLI mismatch on UL "
|
||
|
|
"DATA TFI=%d. (Ignoring due to contention "
|
||
|
|
"resolution)\n", rh->tfi);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
mod_sns = tbf->sns - 1;
|
||
|
|
mod_sns_half = (tbf->sns >> 1) - 1;
|
||
|
|
|
||
|
|
/* restart T3169 */
|
||
|
|
tbf_timer_start(tbf, 3169, T3169);
|
||
|
|
|
||
|
|
/* Increment RX-counter */
|
||
|
|
tbf->dir.ul.rx_counter++;
|
||
|
|
|
||
|
|
/* current block relative to lowest unreceived block */
|
||
|
|
offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns;
|
||
|
|
/* If out of window (may happen if blocks below V(Q) are received
|
||
|
|
* again. */
|
||
|
|
if (offset_v_q >= tbf->ws) {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- BSN %d out of window "
|
||
|
|
"%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q,
|
||
|
|
(tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
/* Write block to buffer and set receive state array. */
|
||
|
|
index = rh->bsn & mod_sns_half; /* memory index of block */
|
||
|
|
memcpy(tbf->rlc_block[index], data, len); /* Copy block. */
|
||
|
|
tbf->rlc_block_len[index] = len;
|
||
|
|
tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n",
|
||
|
|
rh->bsn, tbf->dir.ul.v_q,
|
||
|
|
(tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns);
|
||
|
|
/* Raise V(R) to highest received sequence number not received. */
|
||
|
|
offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns;
|
||
|
|
if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */
|
||
|
|
while (offset_v_r--) {
|
||
|
|
if (offset_v_r) /* all except the received block */
|
||
|
|
tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half]
|
||
|
|
= 'N'; /* Mark block as not received */
|
||
|
|
tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns;
|
||
|
|
/* Inc V(R). */
|
||
|
|
}
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- Raising V(R) to %d\n",
|
||
|
|
tbf->dir.ul.v_r);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Raise V(Q) if possible, and retrieve LLC frames from blocks.
|
||
|
|
* This is looped until there is a gap (non received block) or
|
||
|
|
* the window is empty.*/
|
||
|
|
while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[
|
||
|
|
(index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- Taking block %d out, raising "
|
||
|
|
"V(Q) to %d\n", tbf->dir.ul.v_q,
|
||
|
|
(tbf->dir.ul.v_q + 1) & mod_sns);
|
||
|
|
/* get LLC data from block */
|
||
|
|
gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index],
|
||
|
|
tbf->rlc_block_len[index]);
|
||
|
|
/* raise V(Q), because block already received */
|
||
|
|
tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Check CV of last frame in buffer */
|
||
|
|
if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */
|
||
|
|
&& tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */
|
||
|
|
struct rlc_dl_header *last_rh = (struct rlc_dl_header *)
|
||
|
|
tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half];
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- No gaps in received block, "
|
||
|
|
"last block: BSN=%d CV=%d\n", last_rh->bsn,
|
||
|
|
last_rh->cv);
|
||
|
|
if (last_rh->cv == 0) {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- Finished with UL "
|
||
|
|
"TBF\n");
|
||
|
|
tbf->state = GPRS_RLCMAC_FINISHED;
|
||
|
|
/* Start special timer instead of N3103 counter.
|
||
|
|
* If this expires, resend. */
|
||
|
|
tbf_timer_start(tbf, 3103, 1);
|
||
|
|
tbf->dir.ul.n3103 = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* If TLLI is included or if we received half of the window, we send
|
||
|
|
* an ack/nack */
|
||
|
|
if (rh->ti || tbf->state == GPRS_RLCMAC_FINISHED
|
||
|
|
|| (tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) {
|
||
|
|
if (rh->ti) {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- Scheduling Ack/Nack, "
|
||
|
|
"because TLLI is included.\n");
|
||
|
|
}
|
||
|
|
if (tbf->state == GPRS_RLCMAC_FINISHED) {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- Scheduling Ack/Nack, "
|
||
|
|
"because last block has CV==0.\n");
|
||
|
|
}
|
||
|
|
if ((tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) {
|
||
|
|
LOGP(DRLCMACDATA, LOGL_DEBUG, "- Scheduling Ack/Nack, "
|
||
|
|
"because %d frames received.\n",
|
||
|
|
ACK_AFTER_FRAMES);
|
||
|
|
}
|
||
|
|
/* trigger sending at next RTS */
|
||
|
|
tbf->dir.ul.substate = GPRS_RLCMAC_UL_SEND_ACK;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|