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-rw-r--r--openbsc/src/gprs/gprs_llc_parse.c251
1 files changed, 0 insertions, 251 deletions
diff --git a/openbsc/src/gprs/gprs_llc_parse.c b/openbsc/src/gprs/gprs_llc_parse.c
deleted file mode 100644
index a5a7a7122..000000000
--- a/openbsc/src/gprs/gprs_llc_parse.c
+++ /dev/null
@@ -1,251 +0,0 @@
-/* GPRS LLC protocol implementation as per 3GPP TS 04.64 */
-
-/* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
- *
- * All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include <errno.h>
-#include <stdint.h>
-
-#include <osmocom/core/msgb.h>
-#include <osmocom/core/linuxlist.h>
-#include <osmocom/core/timer.h>
-#include <osmocom/core/talloc.h>
-#include <osmocom/gprs/gprs_bssgp.h>
-
-#include <openbsc/gsm_data.h>
-#include <openbsc/debug.h>
-#include <openbsc/gprs_sgsn.h>
-#include <openbsc/gprs_gmm.h>
-#include <openbsc/gprs_llc.h>
-#include <openbsc/crc24.h>
-
-static const struct value_string llc_cmd_strs[] = {
- { GPRS_LLC_NULL, "NULL" },
- { GPRS_LLC_RR, "RR" },
- { GPRS_LLC_ACK, "ACK" },
- { GPRS_LLC_RNR, "RNR" },
- { GPRS_LLC_SACK, "SACK" },
- { GPRS_LLC_DM, "DM" },
- { GPRS_LLC_DISC, "DISC" },
- { GPRS_LLC_UA, "UA" },
- { GPRS_LLC_SABM, "SABM" },
- { GPRS_LLC_FRMR, "FRMR" },
- { GPRS_LLC_XID, "XID" },
- { GPRS_LLC_UI, "UI" },
- { 0, NULL }
-};
-
-#define LLC_ALLOC_SIZE 16384
-#define UI_HDR_LEN 3
-#define N202 4
-#define CRC24_LENGTH 3
-
-int gprs_llc_fcs(uint8_t *data, unsigned int len)
-{
- uint32_t fcs_calc;
-
- fcs_calc = crc24_calc(INIT_CRC24, data, len);
- fcs_calc = ~fcs_calc;
- fcs_calc &= 0xffffff;
-
- return fcs_calc;
-}
-
-void gprs_llc_hdr_dump(struct gprs_llc_hdr_parsed *gph, struct gprs_llc_lle *lle)
-{
- const char *gea;
- uint32_t iov_ui = 0;
- if (lle) {
- gea = get_value_string(gprs_cipher_names, lle->llme->algo);
- iov_ui = lle->llme->iov_ui;
- } else
- gea = "GEA?";
- DEBUGP(DLLC, "LLC SAPI=%u %c %c %c %s IOV-UI=0x%06x FCS=0x%06x ",
- gph->sapi, gph->is_cmd ? 'C' : 'R', gph->ack_req ? 'A' : ' ',
- gph->is_encrypted ? 'E' : 'U',
- gea, iov_ui, gph->fcs);
-
- if (gph->cmd)
- DEBUGPC(DLLC, "CMD=%s ", get_value_string(llc_cmd_strs, gph->cmd));
-
- if (gph->data)
- DEBUGPC(DLLC, "DATA ");
-
- DEBUGPC(DLLC, "\n");
-}
-
-/* parse a GPRS LLC header, also check for invalid frames */
-int gprs_llc_hdr_parse(struct gprs_llc_hdr_parsed *ghp,
- uint8_t *llc_hdr, int len)
-{
- uint8_t *ctrl = llc_hdr+1;
-
- if (len <= CRC24_LENGTH)
- return -EIO;
-
- ghp->crc_length = len - CRC24_LENGTH;
-
- ghp->ack_req = 0;
-
- /* Section 5.5: FCS */
- ghp->fcs = *(llc_hdr + len - 3);
- ghp->fcs |= *(llc_hdr + len - 2) << 8;
- ghp->fcs |= *(llc_hdr + len - 1) << 16;
-
- /* Section 6.2.1: invalid PD field */
- if (llc_hdr[0] & 0x80)
- return -EIO;
-
- /* This only works for the MS->SGSN direction */
- if (llc_hdr[0] & 0x40)
- ghp->is_cmd = 0;
- else
- ghp->is_cmd = 1;
-
- ghp->sapi = llc_hdr[0] & 0xf;
-
- /* Section 6.2.3: check for reserved SAPI */
- switch (ghp->sapi) {
- case 0:
- case 4:
- case 6:
- case 0xa:
- case 0xc:
- case 0xd:
- case 0xf:
- return -EINVAL;
- }
-
- if ((ctrl[0] & 0x80) == 0) {
- /* I (Information transfer + Supervisory) format */
- uint8_t k;
-
- ghp->data = ctrl + 3;
-
- if (ctrl[0] & 0x40)
- ghp->ack_req = 1;
-
- ghp->seq_tx = (ctrl[0] & 0x1f) << 4;
- ghp->seq_tx |= (ctrl[1] >> 4);
-
- ghp->seq_rx = (ctrl[1] & 0x7) << 6;
- ghp->seq_rx |= (ctrl[2] >> 2);
-
- switch (ctrl[2] & 0x03) {
- case 0:
- ghp->cmd = GPRS_LLC_RR;
- break;
- case 1:
- ghp->cmd = GPRS_LLC_ACK;
- break;
- case 2:
- ghp->cmd = GPRS_LLC_RNR;
- break;
- case 3:
- ghp->cmd = GPRS_LLC_SACK;
- k = ctrl[3] & 0x1f;
- ghp->data += 1 + k;
- break;
- }
- ghp->data_len = (llc_hdr + len - 3) - ghp->data;
- } else if ((ctrl[0] & 0xc0) == 0x80) {
- /* S (Supervisory) format */
- ghp->data = NULL;
- ghp->data_len = 0;
-
- if (ctrl[0] & 0x20)
- ghp->ack_req = 1;
- ghp->seq_rx = (ctrl[0] & 0x7) << 6;
- ghp->seq_rx |= (ctrl[1] >> 2);
-
- switch (ctrl[1] & 0x03) {
- case 0:
- ghp->cmd = GPRS_LLC_RR;
- break;
- case 1:
- ghp->cmd = GPRS_LLC_ACK;
- break;
- case 2:
- ghp->cmd = GPRS_LLC_RNR;
- break;
- case 3:
- ghp->cmd = GPRS_LLC_SACK;
- break;
- }
- } else if ((ctrl[0] & 0xe0) == 0xc0) {
- /* UI (Unconfirmed Inforamtion) format */
- ghp->cmd = GPRS_LLC_UI;
- ghp->data = ctrl + 2;
- ghp->data_len = (llc_hdr + len - 3) - ghp->data;
-
- ghp->seq_tx = (ctrl[0] & 0x7) << 6;
- ghp->seq_tx |= (ctrl[1] >> 2);
- if (ctrl[1] & 0x02) {
- ghp->is_encrypted = 1;
- /* FIXME: encryption */
- }
- if (ctrl[1] & 0x01) {
- /* FCS over hdr + all inf fields */
- } else {
- /* FCS over hdr + N202 octets (4) */
- if (ghp->crc_length > UI_HDR_LEN + N202)
- ghp->crc_length = UI_HDR_LEN + N202;
- }
- } else {
- /* U (Unnumbered) format: 1 1 1 P/F M4 M3 M2 M1 */
- ghp->data = NULL;
- ghp->data_len = 0;
-
- switch (ctrl[0] & 0xf) {
- case GPRS_LLC_U_NULL_CMD:
- ghp->cmd = GPRS_LLC_NULL;
- break;
- case GPRS_LLC_U_DM_RESP:
- ghp->cmd = GPRS_LLC_DM;
- break;
- case GPRS_LLC_U_DISC_CMD:
- ghp->cmd = GPRS_LLC_DISC;
- break;
- case GPRS_LLC_U_UA_RESP:
- ghp->cmd = GPRS_LLC_UA;
- break;
- case GPRS_LLC_U_SABM_CMD:
- ghp->cmd = GPRS_LLC_SABM;
- break;
- case GPRS_LLC_U_FRMR_RESP:
- ghp->cmd = GPRS_LLC_FRMR;
- break;
- case GPRS_LLC_U_XID:
- ghp->cmd = GPRS_LLC_XID;
- ghp->data = ctrl + 1;
- ghp->data_len = (llc_hdr + len - 3) - ghp->data;
- break;
- default:
- return -EIO;
- }
- }
-
- /* FIXME: parse sack frame */
- if (ghp->cmd == GPRS_LLC_SACK) {
- LOGP(DLLC, LOGL_NOTICE, "Unsupported SACK frame\n");
- return -EIO;
- }
-
- return 0;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-18 00:40:31 +0000