617 lines
17 KiB
C
617 lines
17 KiB
C
/* GPRS SNDCP protocol implementation as per 3GPP TS 04.65 */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by On-Waves
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <errno.h>
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#include <stdint.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/core/talloc.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/debug.h>
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#include <openbsc/gprs_bssgp.h>
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#include <openbsc/gprs_llc.h>
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#include <openbsc/sgsn.h>
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#include "gprs_sndcp.h"
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/* Chapter 7.2: SN-PDU Formats */
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struct sndcp_common_hdr {
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/* octet 1 */
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uint8_t nsapi:4;
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uint8_t more:1;
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uint8_t type:1;
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uint8_t first:1;
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uint8_t spare:1;
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} __attribute__((packed));
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/* PCOMP / DCOMP only exist in first fragment */
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struct sndcp_comp_hdr {
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/* octet 2 */
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uint8_t pcomp:4;
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uint8_t dcomp:4;
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} __attribute__((packed));
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struct sndcp_udata_hdr {
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/* octet 3 */
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uint8_t npdu_high:4;
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uint8_t seg_nr:4;
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/* octet 4 */
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uint8_t npdu_low;
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} __attribute__((packed));
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static void *tall_sndcp_ctx;
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/* A fragment queue entry, containing one framgent of a N-PDU */
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struct defrag_queue_entry {
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struct llist_head list;
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/* segment number of this fragment */
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uint32_t seg_nr;
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/* length of the data area of this fragment */
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uint32_t data_len;
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/* pointer to the data of this fragment */
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uint8_t *data;
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};
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LLIST_HEAD(gprs_sndcp_entities);
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/* Enqueue a fragment into the defragment queue */
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static int defrag_enqueue(struct gprs_sndcp_entity *sne, uint8_t seg_nr,
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uint8_t *data, uint32_t data_len)
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{
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struct defrag_queue_entry *dqe;
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dqe = talloc_zero(tall_sndcp_ctx, struct defrag_queue_entry);
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if (!dqe)
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return -ENOMEM;
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dqe->data = talloc_zero_size(dqe, data_len);
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if (!dqe->data) {
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talloc_free(dqe);
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return -ENOMEM;
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}
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dqe->seg_nr = seg_nr;
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dqe->data_len = data_len;
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llist_add(&dqe->list, &sne->defrag.frag_list);
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if (seg_nr > sne->defrag.highest_seg)
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sne->defrag.highest_seg = seg_nr;
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sne->defrag.seg_have |= (1 << seg_nr);
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sne->defrag.tot_len += data_len;
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memcpy(dqe->data, data, data_len);
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return 0;
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}
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/* return if we have all segments of this N-PDU */
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static int defrag_have_all_segments(struct gprs_sndcp_entity *sne)
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{
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uint32_t seg_needed = 0;
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unsigned int i;
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/* create a bitmask of needed segments */
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for (i = 0; i <= sne->defrag.highest_seg; i++)
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seg_needed |= (1 << i);
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if (seg_needed == sne->defrag.seg_have)
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return 1;
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return 0;
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}
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static struct defrag_queue_entry *defrag_get_seg(struct gprs_sndcp_entity *sne,
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uint32_t seg_nr)
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{
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struct defrag_queue_entry *dqe;
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llist_for_each_entry(dqe, &sne->defrag.frag_list, list) {
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if (dqe->seg_nr == seg_nr) {
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llist_del(&dqe->list);
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return dqe;
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}
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}
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return NULL;
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}
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/* Perform actual defragmentation and create an output packet */
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static int defrag_segments(struct gprs_sndcp_entity *sne)
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{
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struct msgb *msg;
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unsigned int seg_nr;
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uint8_t *npdu;
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LOGP(DSNDCP, LOGL_DEBUG, "TLLI=0x%08x NSAPI=%u: Defragment output PDU %u "
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"num_seg=%u tot_len=%u\n", sne->lle->llme->tlli, sne->nsapi,
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sne->defrag.npdu, sne->defrag.highest_seg, sne->defrag.tot_len);
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msg = msgb_alloc_headroom(sne->defrag.tot_len+256, 128, "SNDCP Defrag");
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if (!msg)
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return -ENOMEM;
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/* FIXME: message headers + identifiers */
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npdu = msg->data;
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for (seg_nr = 0; seg_nr <= sne->defrag.highest_seg; seg_nr++) {
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struct defrag_queue_entry *dqe;
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uint8_t *data;
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dqe = defrag_get_seg(sne, seg_nr);
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if (!dqe) {
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LOGP(DSNDCP, LOGL_ERROR, "Segment %u missing\n", seg_nr);
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talloc_free(msg);
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return -EIO;
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}
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/* actually append the segment to the N-PDU */
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data = msgb_put(msg, dqe->data_len);
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memcpy(data, dqe->data, dqe->data_len);
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/* release memory for the fragment queue entry */
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talloc_free(dqe);
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}
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/* FIXME: cancel timer */
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/* actually send the N-PDU to the SGSN core code, which then
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* hands it off to the correct GTP tunnel + GGSN via gtp_data_req() */
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return sgsn_rx_sndcp_ud_ind(&sne->ra_id, sne->lle->llme->tlli,
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sne->nsapi, msg, sne->defrag.tot_len, npdu);
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}
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static int defrag_input(struct gprs_sndcp_entity *sne, struct msgb *msg, uint8_t *hdr,
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unsigned int len)
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{
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struct sndcp_common_hdr *sch;
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struct sndcp_comp_hdr *scomph = NULL;
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struct sndcp_udata_hdr *suh;
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uint16_t npdu_num;
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uint8_t *data;
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int rc;
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sch = (struct sndcp_common_hdr *) hdr;
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if (sch->first) {
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scomph = (struct sndcp_comp_hdr *) (hdr + 1);
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suh = (struct sndcp_udata_hdr *) (hdr + 1 + sizeof(struct sndcp_common_hdr));
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} else
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suh = (struct sndcp_udata_hdr *) (hdr + sizeof(struct sndcp_common_hdr));
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data = (uint8_t *)suh + sizeof(struct sndcp_udata_hdr);
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npdu_num = (suh->npdu_high << 8) | suh->npdu_low;
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LOGP(DSNDCP, LOGL_DEBUG, "TLLI=0x%08x NSAPI=%u: Input PDU %u Segment %u "
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"Length %u %s %s\n", sne->lle->llme->tlli, sne->nsapi, npdu_num,
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suh->seg_nr, len, sch->first ? "F " : "", sch->more ? "M" : "");
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if (sch->first) {
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/* first segment of a new packet. Discard all leftover fragments of
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* previous packet */
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if (!llist_empty(&sne->defrag.frag_list)) {
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struct defrag_queue_entry *dqe, *dqe2;
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LOGP(DSNDCP, LOGL_INFO, "TLLI=0x%08x NSAPI=%u: Dropping "
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"SN-PDU %u due to insufficient segments (%04x)\n",
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sne->lle->llme->tlli, sne->nsapi, sne->defrag.npdu,
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sne->defrag.seg_have);
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llist_for_each_entry_safe(dqe, dqe2, &sne->defrag.frag_list, list) {
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llist_del(&dqe->list);
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talloc_free(dqe);
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}
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}
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/* store the currently de-fragmented PDU number */
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sne->defrag.npdu = npdu_num;
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/* Re-set fragmentation state */
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sne->defrag.no_more = sne->defrag.highest_seg = sne->defrag.seg_have = 0;
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sne->defrag.tot_len = 0;
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/* FIXME: (re)start timer */
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}
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if (sne->defrag.npdu != npdu_num) {
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LOGP(DSNDCP, LOGL_INFO, "Segment for different SN-PDU "
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"(%u != %u)\n", npdu_num, sne->defrag.npdu);
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/* FIXME */
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}
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/* FIXME: check if seg_nr already exists */
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/* make sure to subtract length of SNDCP header from 'len' */
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rc = defrag_enqueue(sne, suh->seg_nr, data, len - (data - hdr));
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if (rc < 0)
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return rc;
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if (!sch->more) {
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/* this is suppsed to be the last segment of the N-PDU, but it
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* might well be not the last to arrive */
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sne->defrag.no_more = 1;
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}
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if (sne->defrag.no_more) {
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/* we have already received the last segment before, let's check
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* if all the previous segments exist */
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if (defrag_have_all_segments(sne))
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return defrag_segments(sne);
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}
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return 0;
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}
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static struct gprs_sndcp_entity *gprs_sndcp_entity_by_lle(const struct gprs_llc_lle *lle,
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uint8_t nsapi)
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{
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struct gprs_sndcp_entity *sne;
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llist_for_each_entry(sne, &gprs_sndcp_entities, list) {
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if (sne->lle == lle && sne->nsapi == nsapi)
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return sne;
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}
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return NULL;
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}
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static struct gprs_sndcp_entity *gprs_sndcp_entity_alloc(struct gprs_llc_lle *lle,
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uint8_t nsapi)
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{
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struct gprs_sndcp_entity *sne;
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sne = talloc_zero(tall_sndcp_ctx, struct gprs_sndcp_entity);
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if (!sne)
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return NULL;
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sne->lle = lle;
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sne->nsapi = nsapi;
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sne->defrag.timer.data = sne;
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//sne->fqueue.timer.cb = FIXME;
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sne->rx_state = SNDCP_RX_S_FIRST;
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INIT_LLIST_HEAD(&sne->defrag.frag_list);
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llist_add(&sne->list, &gprs_sndcp_entities);
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return sne;
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}
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/* Entry point for the SNSM-ACTIVATE.indication */
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int sndcp_sm_activate_ind(struct gprs_llc_lle *lle, uint8_t nsapi)
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{
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LOGP(DSNDCP, LOGL_INFO, "SNSM-ACTIVATE.ind (lle=%p TLLI=%08x, "
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"SAPI=%u, NSAPI=%u)\n", lle, lle->llme->tlli, lle->sapi, nsapi);
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if (gprs_sndcp_entity_by_lle(lle, nsapi)) {
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LOGP(DSNDCP, LOGL_ERROR, "Trying to ACTIVATE "
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"already-existing entity (TLLI=%08x, NSAPI=%u)\n",
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lle->llme->tlli, nsapi);
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return -EEXIST;
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}
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if (!gprs_sndcp_entity_alloc(lle, nsapi)) {
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LOGP(DSNDCP, LOGL_ERROR, "Out of memory during ACTIVATE\n");
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return -ENOMEM;
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}
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return 0;
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}
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/* Entry point for the SNSM-DEACTIVATE.indication */
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int sndcp_sm_deactivate_ind(struct gprs_llc_lle *lle, uint8_t nsapi)
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{
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struct gprs_sndcp_entity *sne;
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LOGP(DSNDCP, LOGL_INFO, "SNSM-DEACTIVATE.ind (lle=%p, TLLI=%08x, "
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"SAPI=%u, NSAPI=%u)\n", lle, lle->llme->tlli, lle->sapi, nsapi);
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sne = gprs_sndcp_entity_by_lle(lle, nsapi);
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if (!sne) {
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LOGP(DSNDCP, LOGL_ERROR, "SNSM-DEACTIVATE.ind for non-"
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"existing TLLI=%08x SAPI=%u NSAPI=%u\n", lle->llme->tlli,
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lle->sapi, nsapi);
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return -ENOENT;
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}
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llist_del(&sne->list);
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/* frag queue entries are hierarchically allocated, so no need to
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* free them explicitly here */
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talloc_free(sne);
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return 0;
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}
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/* Fragmenter state */
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struct sndcp_frag_state {
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uint8_t frag_nr;
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struct msgb *msg; /* original message */
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uint8_t *next_byte; /* first byte of next fragment */
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struct gprs_sndcp_entity *sne;
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void *mmcontext;
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};
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/* returns '1' if there are more fragments to send, '0' if none */
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static int sndcp_send_ud_frag(struct sndcp_frag_state *fs)
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{
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struct gprs_sndcp_entity *sne = fs->sne;
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struct gprs_llc_lle *lle = sne->lle;
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struct sndcp_common_hdr *sch;
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struct sndcp_comp_hdr *scomph;
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struct sndcp_udata_hdr *suh;
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struct msgb *fmsg;
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unsigned int max_payload_len;
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unsigned int len;
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uint8_t *data;
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int rc, more;
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fmsg = msgb_alloc_headroom(fs->sne->lle->params.n201_u+256, 128,
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"SNDCP Frag");
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if (!fmsg)
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return -ENOMEM;
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/* make sure lower layers route the fragment like the original */
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msgb_tlli(fmsg) = msgb_tlli(fs->msg);
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msgb_bvci(fmsg) = msgb_bvci(fs->msg);
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msgb_nsei(fmsg) = msgb_nsei(fs->msg);
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/* prepend common SNDCP header */
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sch = (struct sndcp_common_hdr *) msgb_put(fmsg, sizeof(*sch));
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sch->nsapi = sne->nsapi;
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/* Set FIRST bit if we are the first fragment in a series */
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if (fs->frag_nr == 0)
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sch->first = 1;
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sch->type = 1;
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/* append the compression header for first fragment */
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if (sch->first) {
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scomph = (struct sndcp_comp_hdr *)
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msgb_put(fmsg, sizeof(*scomph));
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scomph->pcomp = 0;
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scomph->dcomp = 0;
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}
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/* append the user-data header */
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suh = (struct sndcp_udata_hdr *) msgb_put(fmsg, sizeof(*suh));
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suh->npdu_low = sne->tx_npdu_nr & 0xff;
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suh->npdu_high = (sne->tx_npdu_nr >> 8) & 0xf;
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suh->seg_nr = fs->frag_nr % 0xf;
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/* calculate remaining length to be sent */
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len = (fs->msg->data + fs->msg->len) - fs->next_byte;
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/* how much payload can we actually send via LLC? */
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max_payload_len = lle->params.n201_u - (sizeof(*sch) + sizeof(*suh));
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if (sch->first)
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max_payload_len -= sizeof(*scomph);
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/* check if we're exceeding the max */
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if (len > max_payload_len)
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len = max_payload_len;
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/* copy the actual fragment data into our fmsg */
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data = msgb_put(fmsg, len);
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memcpy(data, fs->next_byte, len);
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/* Increment fragment number and data pointer to next fragment */
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fs->frag_nr++;
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fs->next_byte += len;
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/* determine if we have more fragemnts to send */
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if ((fs->msg->data + fs->msg->len) <= fs->next_byte)
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more = 0;
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else
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more = 1;
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/* set the MORE bit of the SNDCP header accordingly */
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sch->more = more;
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rc = gprs_llc_tx_ui(fmsg, lle->sapi, 0, fs->mmcontext);
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if (rc < 0) {
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/* abort in case of error, do not advance frag_nr / next_byte */
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msgb_free(fmsg);
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return rc;
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}
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if (!more) {
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/* we've sent all fragments */
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msgb_free(fs->msg);
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memset(fs, 0, sizeof(*fs));
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/* increment NPDU number for next frame */
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sne->tx_npdu_nr = (sne->tx_npdu_nr + 1) % 0xfff;
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return 0;
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}
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/* default: more fragments to send */
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return 1;
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}
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/* Request transmission of a SN-PDU over specified LLC Entity + SAPI */
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int sndcp_unitdata_req(struct msgb *msg, struct gprs_llc_lle *lle, uint8_t nsapi,
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void *mmcontext)
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{
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struct gprs_sndcp_entity *sne;
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struct sndcp_common_hdr *sch;
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struct sndcp_comp_hdr *scomph;
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struct sndcp_udata_hdr *suh;
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struct sndcp_frag_state fs;
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/* Identifiers from UP: (TLLI, SAPI) + (BVCI, NSEI) */
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sne = gprs_sndcp_entity_by_lle(lle, nsapi);
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if (!sne) {
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LOGP(DSNDCP, LOGL_ERROR, "Cannot find SNDCP Entity\n");
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return -EIO;
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}
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/* Check if we need to fragment this N-PDU into multiple SN-PDUs */
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if (msg->len > lle->params.n201_u -
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(sizeof(*sch) + sizeof(*suh) + sizeof(*scomph))) {
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/* initialize the fragmenter state */
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fs.msg = msg;
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fs.frag_nr = 0;
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fs.next_byte = msg->data;
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fs.sne = sne;
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fs.mmcontext = mmcontext;
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/* call function to generate and send fragments until all
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* of the N-PDU has been sent */
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while (1) {
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int rc = sndcp_send_ud_frag(&fs);
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if (rc == 0)
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return 0;
|
|
if (rc < 0)
|
|
return rc;
|
|
}
|
|
/* not reached */
|
|
return 0;
|
|
}
|
|
|
|
/* this is the non-fragmenting case where we only build 1 SN-PDU */
|
|
|
|
/* prepend the user-data header */
|
|
suh = (struct sndcp_udata_hdr *) msgb_push(msg, sizeof(*suh));
|
|
suh->npdu_low = sne->tx_npdu_nr & 0xff;
|
|
suh->npdu_high = (sne->tx_npdu_nr >> 8) & 0xf;
|
|
suh->seg_nr = 0;
|
|
sne->tx_npdu_nr = (sne->tx_npdu_nr + 1) % 0xfff;
|
|
|
|
scomph = (struct sndcp_comp_hdr *) msgb_push(msg, sizeof(*scomph));
|
|
scomph->pcomp = 0;
|
|
scomph->dcomp = 0;
|
|
|
|
/* prepend common SNDCP header */
|
|
sch = (struct sndcp_common_hdr *) msgb_push(msg, sizeof(*sch));
|
|
sch->first = 1;
|
|
sch->type = 1;
|
|
sch->nsapi = nsapi;
|
|
|
|
return gprs_llc_tx_ui(msg, lle->sapi, 0, mmcontext);
|
|
}
|
|
|
|
/* Section 5.1.2.17 LL-UNITDATA.ind */
|
|
int sndcp_llunitdata_ind(struct msgb *msg, struct gprs_llc_lle *lle,
|
|
uint8_t *hdr, uint16_t len)
|
|
{
|
|
struct gprs_sndcp_entity *sne;
|
|
struct sndcp_common_hdr *sch = (struct sndcp_common_hdr *)hdr;
|
|
struct sndcp_comp_hdr *scomph = NULL;
|
|
struct sndcp_udata_hdr *suh;
|
|
uint8_t *npdu;
|
|
uint16_t npdu_num;
|
|
int npdu_len;
|
|
|
|
sch = (struct sndcp_common_hdr *) hdr;
|
|
if (sch->first) {
|
|
scomph = (struct sndcp_comp_hdr *) (hdr + 1);
|
|
suh = (struct sndcp_udata_hdr *) (hdr + 1 + sizeof(struct sndcp_common_hdr));
|
|
} else
|
|
suh = (struct sndcp_udata_hdr *) (hdr + sizeof(struct sndcp_common_hdr));
|
|
|
|
if (sch->type == 0) {
|
|
LOGP(DSNDCP, LOGL_ERROR, "SN-DATA PDU at unitdata_ind() function\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (len < sizeof(*sch) + sizeof(*suh)) {
|
|
LOGP(DSNDCP, LOGL_ERROR, "SN-UNITDATA PDU too short (%u)\n", len);
|
|
return -EIO;
|
|
}
|
|
|
|
sne = gprs_sndcp_entity_by_lle(lle, sch->nsapi);
|
|
if (!sne) {
|
|
LOGP(DSNDCP, LOGL_ERROR, "Message for non-existing SNDCP Entity "
|
|
"(lle=%p, TLLI=%08x, SAPI=%u, NSAPI=%u)\n", lle,
|
|
lle->llme->tlli, lle->sapi, sch->nsapi);
|
|
return -EIO;
|
|
}
|
|
/* FIXME: move this RA_ID up to the LLME or even higher */
|
|
bssgp_parse_cell_id(&sne->ra_id, msgb_bcid(msg));
|
|
|
|
/* any non-first segment is by definition something to defragment
|
|
* as is any segment that tells us there are more segments */
|
|
if (!sch->first || sch->more)
|
|
return defrag_input(sne, msg, hdr, len);
|
|
|
|
if (scomph && (scomph->pcomp || scomph->dcomp)) {
|
|
LOGP(DSNDCP, LOGL_ERROR, "We don't support compression yet\n");
|
|
return -EIO;
|
|
}
|
|
|
|
npdu_num = (suh->npdu_high << 8) | suh->npdu_low;
|
|
npdu = (uint8_t *)suh + sizeof(*suh);
|
|
npdu_len = (msg->data + msg->len) - npdu;
|
|
if (npdu_len <= 0) {
|
|
LOGP(DSNDCP, LOGL_ERROR, "Short SNDCP N-PDU: %d\n", npdu_len);
|
|
return -EIO;
|
|
}
|
|
/* actually send the N-PDU to the SGSN core code, which then
|
|
* hands it off to the correct GTP tunnel + GGSN via gtp_data_req() */
|
|
return sgsn_rx_sndcp_ud_ind(&sne->ra_id, lle->llme->tlli, sne->nsapi, msg, npdu_len, npdu);
|
|
}
|
|
|
|
/* Section 5.1.2.1 LL-RESET.ind */
|
|
static int sndcp_ll_reset_ind(struct gprs_sndcp_entity *se)
|
|
{
|
|
/* treat all outstanding SNDCP-LLC request type primitives as not sent */
|
|
/* reset all SNDCP XID parameters to default values */
|
|
}
|
|
|
|
static int sndcp_ll_status_ind()
|
|
{
|
|
/* inform the SM sub-layer by means of SNSM-STATUS.req */
|
|
}
|
|
|
|
#if 0
|
|
static struct sndcp_state_list {{
|
|
uint32_t states;
|
|
unsigned int type;
|
|
int (*rout)(struct gprs_sndcp_entity *se, struct msgb *msg);
|
|
} sndcp_state_list[] = {
|
|
{ ALL_STATES,
|
|
LL_RESET_IND, sndcp_ll_reset_ind },
|
|
{ ALL_STATES,
|
|
LL_ESTABLISH_IND, sndcp_ll_est_ind },
|
|
{ SBIT(SNDCP_S_EST_RQD),
|
|
LL_ESTABLISH_RESP, sndcp_ll_est_ind },
|
|
{ SBIT(SNDCP_S_EST_RQD),
|
|
LL_ESTABLISH_CONF, sndcp_ll_est_conf },
|
|
{ SBIT(SNDCP_S_
|
|
};
|
|
|
|
static int sndcp_rx_llc_prim()
|
|
{
|
|
case LL_ESTABLISH_REQ:
|
|
case LL_RELEASE_REQ:
|
|
case LL_XID_REQ:
|
|
case LL_DATA_REQ:
|
|
LL_UNITDATA_REQ, /* TLLI, SN-PDU, Ref, QoS, Radio Prio, Ciph */
|
|
|
|
switch (prim) {
|
|
case LL_RESET_IND:
|
|
case LL_ESTABLISH_IND:
|
|
case LL_ESTABLISH_RESP:
|
|
case LL_ESTABLISH_CONF:
|
|
case LL_RELEASE_IND:
|
|
case LL_RELEASE_CONF:
|
|
case LL_XID_IND:
|
|
case LL_XID_RESP:
|
|
case LL_XID_CONF:
|
|
case LL_DATA_IND:
|
|
case LL_DATA_CONF:
|
|
case LL_UNITDATA_IND:
|
|
case LL_STATUS_IND:
|
|
}
|
|
#endif
|