mirror of https://gerrit.osmocom.org/libosmocore
459 lines
9.8 KiB
C
459 lines
9.8 KiB
C
/* OpenBSC Abis input driver for ip.access */
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/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by Holger Hans Peter Freyther
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <unistd.h>
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#include <stdint.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/macaddr.h>
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#include <osmocom/core/select.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/gsm/protocol/ipaccess.h>
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#include <osmocom/gsm/ipa.h>
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#define IPA_ALLOC_SIZE 1200
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/*
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* Common propietary IPA messages:
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* - PONG: in reply to PING.
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* - ID_REQUEST: first messages once OML has been established.
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* - ID_ACK: in reply to ID_ACK.
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*/
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static const uint8_t ipa_pong_msg[] = {
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0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG
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};
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static const uint8_t ipa_id_ack_msg[] = {
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0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK
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};
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static const uint8_t ipa_id_req_msg[] = {
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0, 17, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_GET,
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0x01, IPAC_IDTAG_UNIT,
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0x01, IPAC_IDTAG_MACADDR,
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0x01, IPAC_IDTAG_LOCATION1,
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0x01, IPAC_IDTAG_LOCATION2,
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0x01, IPAC_IDTAG_EQUIPVERS,
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0x01, IPAC_IDTAG_SWVERSION,
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0x01, IPAC_IDTAG_UNITNAME,
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0x01, IPAC_IDTAG_SERNR,
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};
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static const char *idtag_names[] = {
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[IPAC_IDTAG_SERNR] = "Serial_Number",
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[IPAC_IDTAG_UNITNAME] = "Unit_Name",
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[IPAC_IDTAG_LOCATION1] = "Location_1",
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[IPAC_IDTAG_LOCATION2] = "Location_2",
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[IPAC_IDTAG_EQUIPVERS] = "Equipment_Version",
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[IPAC_IDTAG_SWVERSION] = "Software_Version",
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[IPAC_IDTAG_IPADDR] = "IP_Address",
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[IPAC_IDTAG_MACADDR] = "MAC_Address",
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[IPAC_IDTAG_UNIT] = "Unit_ID",
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};
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const char *ipa_ccm_idtag_name(uint8_t tag)
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{
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if (tag >= ARRAY_SIZE(idtag_names))
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return "unknown";
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return idtag_names[tag];
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}
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int ipa_ccm_idtag_parse(struct tlv_parsed *dec, unsigned char *buf, int len)
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{
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return ipa_ccm_idtag_parse_off(dec, buf, len, 0);
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}
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int ipa_ccm_idtag_parse_off(struct tlv_parsed *dec, unsigned char *buf, int len, const int len_offset)
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{
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uint8_t t_len;
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uint8_t t_tag;
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uint8_t *cur = buf;
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memset(dec, 0, sizeof(*dec));
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while (len >= 2) {
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len -= 2;
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t_len = *cur++;
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t_tag = *cur++;
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if (t_len < len_offset) {
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LOGP(DLMI, LOGL_ERROR, "minimal offset not included: %d < %d\n", t_len, len_offset);
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return -EINVAL;
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}
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if (t_len > len + 1) {
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LOGP(DLMI, LOGL_ERROR, "The tag does not fit: %d > %d\n", t_len, len + 1);
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return -EINVAL;
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}
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DEBUGPC(DLMI, "%s='%s' ", ipa_ccm_idtag_name(t_tag), cur);
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dec->lv[t_tag].len = t_len - len_offset;
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dec->lv[t_tag].val = cur;
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cur += t_len - len_offset;
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len -= t_len - len_offset;
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}
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return 0;
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}
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int ipa_parse_unitid(const char *str, struct ipaccess_unit *unit_data)
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{
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unsigned long ul;
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char *endptr;
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const char *nptr;
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nptr = str;
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ul = strtoul(nptr, &endptr, 10);
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if (endptr <= nptr)
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return -EINVAL;
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unit_data->site_id = ul & 0xffff;
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if (*endptr++ != '/')
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return -EINVAL;
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nptr = endptr;
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ul = strtoul(nptr, &endptr, 10);
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if (endptr <= nptr)
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return -EINVAL;
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unit_data->bts_id = ul & 0xffff;
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if (*endptr++ != '/')
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return -EINVAL;
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nptr = endptr;
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ul = strtoul(nptr, &endptr, 10);
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if (endptr <= nptr)
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return -EINVAL;
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unit_data->trx_id = ul & 0xffff;
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return 0;
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}
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int ipa_ccm_tlv_to_unitdata(struct ipaccess_unit *ud,
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const struct tlv_parsed *tp)
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{
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int rc = 0;
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if (TLVP_PRES_LEN(tp, IPAC_IDTAG_SERNR, 1))
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ud->serno = talloc_strdup(ud, (char *)
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TLVP_VAL(tp, IPAC_IDTAG_SERNR));
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if (TLVP_PRES_LEN(tp, IPAC_IDTAG_UNITNAME, 1))
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ud->unit_name = talloc_strdup(ud, (char *)
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TLVP_VAL(tp, IPAC_IDTAG_UNITNAME));
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if (TLVP_PRES_LEN(tp, IPAC_IDTAG_LOCATION1, 1))
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ud->location1 = talloc_strdup(ud, (char *)
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TLVP_VAL(tp, IPAC_IDTAG_LOCATION1));
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if (TLVP_PRES_LEN(tp, IPAC_IDTAG_LOCATION2, 1))
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ud->location2 = talloc_strdup(ud, (char *)
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TLVP_VAL(tp, IPAC_IDTAG_LOCATION2));
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if (TLVP_PRES_LEN(tp, IPAC_IDTAG_EQUIPVERS, 1))
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ud->equipvers = talloc_strdup(ud, (char *)
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TLVP_VAL(tp, IPAC_IDTAG_EQUIPVERS));
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if (TLVP_PRES_LEN(tp, IPAC_IDTAG_SWVERSION, 1))
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ud->swversion = talloc_strdup(ud, (char *)
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TLVP_VAL(tp, IPAC_IDTAG_SWVERSION));
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if (TLVP_PRES_LEN(tp, IPAC_IDTAG_MACADDR, 17)) {
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rc = osmo_macaddr_parse(ud->mac_addr, (char *)
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TLVP_VAL(tp, IPAC_IDTAG_MACADDR));
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if (rc < 0)
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goto out;
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}
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if (TLVP_PRES_LEN(tp, IPAC_IDTAG_UNIT, 1))
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rc = ipa_parse_unitid((char *)
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TLVP_VAL(tp, IPAC_IDTAG_UNIT), ud);
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out:
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return rc;
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}
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int ipa_send(int fd, const void *msg, size_t msglen)
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{
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int ret;
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ret = write(fd, msg, msglen);
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if (ret < 0)
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return -errno;
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if (ret < msglen) {
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LOGP(DLINP, LOGL_ERROR, "ipa_send: short write\n");
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return -EIO;
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}
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return ret;
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}
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int ipa_ccm_send_pong(int fd)
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{
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return ipa_send(fd, ipa_pong_msg, sizeof(ipa_pong_msg));
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}
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int ipa_ccm_send_id_ack(int fd)
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{
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return ipa_send(fd, ipa_id_ack_msg, sizeof(ipa_id_ack_msg));
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}
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int ipa_ccm_send_id_req(int fd)
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{
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return ipa_send(fd, ipa_id_req_msg, sizeof(ipa_id_req_msg));
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}
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/* base handling of the ip.access protocol */
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int ipa_ccm_rcvmsg_base(struct msgb *msg, struct osmo_fd *bfd)
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{
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uint8_t msg_type = *(msg->l2h);
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int ret;
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switch (msg_type) {
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case IPAC_MSGT_PING:
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ret = ipa_ccm_send_pong(bfd->fd);
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if (ret < 0) {
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LOGP(DLINP, LOGL_ERROR, "Cannot send PING "
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"message. Reason: %s\n", strerror(errno));
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break;
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}
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ret = 1;
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break;
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case IPAC_MSGT_PONG:
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DEBUGP(DLMI, "PONG!\n");
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ret = 1;
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break;
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case IPAC_MSGT_ID_ACK:
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DEBUGP(DLMI, "ID_ACK? -> ACK!\n");
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ret = ipa_ccm_send_id_ack(bfd->fd);
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if (ret < 0) {
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LOGP(DLINP, LOGL_ERROR, "Cannot send ID_ACK "
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"message. Reason: %s\n", strerror(errno));
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break;
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}
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ret = 1;
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break;
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default:
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/* This is not an IPA PING, PONG or ID_ACK message */
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ret = 0;
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break;
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}
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return ret;
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}
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/* base handling of the ip.access protocol */
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int ipa_ccm_rcvmsg_bts_base(struct msgb *msg, struct osmo_fd *bfd)
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{
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uint8_t msg_type = *(msg->l2h);
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int ret = 0;
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switch (msg_type) {
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case IPAC_MSGT_PING:
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ret = ipa_ccm_send_pong(bfd->fd);
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if (ret < 0) {
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LOGP(DLINP, LOGL_ERROR, "Cannot send PONG "
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"message. Reason: %s\n", strerror(errno));
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}
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break;
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case IPAC_MSGT_PONG:
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DEBUGP(DLMI, "PONG!\n");
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break;
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case IPAC_MSGT_ID_ACK:
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DEBUGP(DLMI, "ID_ACK\n");
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break;
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}
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return ret;
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}
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void ipa_prepend_header_ext(struct msgb *msg, int proto)
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{
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struct ipaccess_head_ext *hh_ext;
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/* prepend the osmo ip.access header extension */
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hh_ext = (struct ipaccess_head_ext *) msgb_push(msg, sizeof(*hh_ext));
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hh_ext->proto = proto;
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}
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void ipa_prepend_header(struct msgb *msg, int proto)
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{
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struct ipaccess_head *hh;
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/* prepend the ip.access header */
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hh = (struct ipaccess_head *) msgb_push(msg, sizeof(*hh));
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hh->len = htons(msg->len - sizeof(*hh));
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hh->proto = proto;
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}
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int ipa_msg_recv(int fd, struct msgb **rmsg)
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{
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int rc = ipa_msg_recv_buffered(fd, rmsg, NULL);
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if (rc < 0) {
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errno = -rc;
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rc = -1;
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}
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return rc;
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}
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int ipa_msg_recv_buffered(int fd, struct msgb **rmsg, struct msgb **tmp_msg)
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{
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struct msgb *msg = tmp_msg ? *tmp_msg : NULL;
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struct ipaccess_head *hh;
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int len, ret;
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int needed;
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if (msg == NULL) {
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msg = ipa_msg_alloc(0);
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if (msg == NULL) {
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ret = -ENOMEM;
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goto discard_msg;
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}
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msg->l1h = msg->tail;
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}
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if (msg->l2h == NULL) {
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/* first read our 3-byte header */
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needed = sizeof(*hh) - msg->len;
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ret = recv(fd, msg->tail, needed, 0);
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if (ret == 0)
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goto discard_msg;
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if (ret < 0) {
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if (errno == EAGAIN || errno == EINTR)
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ret = 0;
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else {
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ret = -errno;
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goto discard_msg;
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}
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}
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msgb_put(msg, ret);
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if (ret < needed) {
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if (msg->len == 0) {
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ret = -EAGAIN;
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goto discard_msg;
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}
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LOGP(DLINP, LOGL_INFO,
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"Received part of IPA message header (%d/%zu)\n",
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msg->len, sizeof(*hh));
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if (!tmp_msg) {
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ret = -EIO;
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goto discard_msg;
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}
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*tmp_msg = msg;
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return -EAGAIN;
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}
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msg->l2h = msg->tail;
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}
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hh = (struct ipaccess_head *) msg->data;
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/* then read the length as specified in header */
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len = ntohs(hh->len);
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if (len < 0 || IPA_ALLOC_SIZE < len + sizeof(*hh)) {
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LOGP(DLINP, LOGL_ERROR, "bad message length of %d bytes, "
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"received %d bytes\n", len, msg->len);
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ret = -EIO;
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goto discard_msg;
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}
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needed = len - msgb_l2len(msg);
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if (needed > 0) {
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ret = recv(fd, msg->tail, needed, 0);
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if (ret == 0)
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goto discard_msg;
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if (ret < 0) {
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if (errno == EAGAIN || errno == EINTR)
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ret = 0;
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else {
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ret = -errno;
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goto discard_msg;
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}
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}
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msgb_put(msg, ret);
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if (ret < needed) {
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LOGP(DLINP, LOGL_INFO,
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"Received part of IPA message L2 data (%d/%d)\n",
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msgb_l2len(msg), len);
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if (!tmp_msg) {
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ret = -EIO;
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goto discard_msg;
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}
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*tmp_msg = msg;
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return -EAGAIN;
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}
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}
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ret = msgb_l2len(msg);
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if (ret == 0) {
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LOGP(DLINP, LOGL_INFO,
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"Discarding IPA message without payload\n");
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ret = -EAGAIN;
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goto discard_msg;
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}
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if (tmp_msg)
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*tmp_msg = NULL;
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*rmsg = msg;
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return ret;
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discard_msg:
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if (tmp_msg)
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*tmp_msg = NULL;
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msgb_free(msg);
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return ret;
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}
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struct msgb *ipa_msg_alloc(int headroom)
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{
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struct msgb *nmsg;
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headroom += sizeof(struct ipaccess_head);
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nmsg = msgb_alloc_headroom(1200 + headroom, headroom, "Abis/IP");
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if (!nmsg)
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return NULL;
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return nmsg;
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}
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