| /* OpenBSC Abis input driver for ip.access */ |
| |
| /* (C) 2009 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2010 by Holger Hans Peter Freyther |
| * (C) 2010 by On-Waves |
| * |
| * All Rights Reserved |
| * |
| * SPDX-License-Identifier: AGPL-3.0+ |
| * |
| * 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 "internal.h" |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <stdbool.h> |
| #include <errno.h> |
| #include <netinet/tcp.h> |
| #include <string.h> |
| #include <time.h> |
| #include <fcntl.h> |
| #include <sys/socket.h> |
| #include <sys/ioctl.h> |
| #include <arpa/inet.h> |
| |
| #include <osmocom/core/select.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/macaddr.h> |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/abis/e1_input.h> |
| #include <osmocom/abis/ipaccess.h> |
| #include <osmocom/core/socket.h> |
| #include <osmocom/abis/ipa.h> |
| #include <osmocom/core/backtrace.h> |
| #include <osmocom/gsm/ipa.h> |
| |
| static void *tall_ipa_ctx; |
| |
| #define TS1_ALLOC_SIZE 900 |
| |
| #define DEFAULT_TCP_KEEPALIVE_IDLE_TIMEOUT 30 |
| #define DEFAULT_TCP_KEEPALIVE_INTERVAL 3 |
| #define DEFAULT_TCP_KEEPALIVE_RETRY_COUNT 10 |
| |
| static int ipaccess_drop(struct osmo_fd *bfd, struct e1inp_line *line) |
| { |
| int ret = 1; |
| struct e1inp_ts *e1i_ts; |
| if (bfd->priv_nr == E1INP_SIGN_OML) |
| e1i_ts = e1inp_line_ipa_oml_ts(line); |
| else |
| e1i_ts = e1inp_line_ipa_rsl_ts(line, bfd->priv_nr - E1INP_SIGN_RSL); |
| |
| /* Error case: we did not see any ID_RESP yet for this socket. */ |
| if (bfd->fd != -1) { |
| LOGP(DLINP, LOGL_ERROR, "Forcing socket shutdown with " |
| "no signal link set\n"); |
| osmo_fd_unregister(bfd); |
| close(bfd->fd); |
| bfd->fd = -1; |
| ret = -ENOENT; |
| } |
| |
| msgb_free(e1i_ts->pending_msg); |
| e1i_ts->pending_msg = NULL; |
| |
| /* e1inp_sign_link_destroy releases the socket descriptors for us. */ |
| line->ops->sign_link_down(line); |
| |
| return ret; |
| } |
| |
| /* Returns -1 on error, and 0 or 1 on success. If -1 or 1 is returned, line has |
| * been released and should not be used anymore by the caller. */ |
| static int ipaccess_rcvmsg(struct e1inp_line *line, struct msgb *msg, |
| struct osmo_fd *bfd) |
| { |
| struct tlv_parsed tlvp; |
| uint8_t msg_type = *(msg->l2h); |
| struct ipaccess_unit unit_data = {}; |
| struct e1inp_sign_link *sign_link; |
| char *unitid; |
| int len, ret; |
| |
| /* Handle IPA PING, PONG and ID_ACK messages. */ |
| ret = ipa_ccm_rcvmsg_base(msg, bfd); |
| switch(ret) { |
| case -1: |
| /* error in IPA control message handling */ |
| goto err; |
| case 1: |
| /* this is an IPA control message, skip further processing */ |
| return 0; |
| case 0: |
| /* this is not an IPA control message, continue */ |
| break; |
| default: |
| LOGP(DLINP, LOGL_ERROR, "Unexpected return from " |
| "ipa_ccm_rcvmsg_base " |
| "(ret=%d)\n", ret); |
| goto err; |
| } |
| |
| switch (msg_type) { |
| case IPAC_MSGT_ID_RESP: |
| DEBUGP(DLMI, "ID_RESP\n"); |
| /* parse tags, search for Unit ID */ |
| ret = ipa_ccm_id_resp_parse(&tlvp, (const uint8_t *)msg->l2h+1, msgb_l2len(msg)-1); |
| DEBUGP(DLMI, "\n"); |
| if (ret < 0) { |
| LOGP(DLINP, LOGL_ERROR, "IPA response message " |
| "with malformed TLVs\n"); |
| goto err; |
| } |
| if (!TLVP_PRESENT(&tlvp, IPAC_IDTAG_UNIT)) { |
| LOGP(DLINP, LOGL_ERROR, "IPA response message " |
| "without unit ID\n"); |
| goto err; |
| |
| } |
| len = TLVP_LEN(&tlvp, IPAC_IDTAG_UNIT); |
| if (len < 1) { |
| LOGP(DLINP, LOGL_ERROR, "IPA response message " |
| "with too small unit ID\n"); |
| goto err; |
| } |
| unitid = (char *) TLVP_VAL(&tlvp, IPAC_IDTAG_UNIT); |
| unitid[len - 1] = '\0'; |
| ipa_parse_unitid(unitid, &unit_data); |
| |
| if (!line->ops->sign_link_up) { |
| LOGP(DLINP, LOGL_ERROR, |
| "Unable to set signal link, closing socket.\n"); |
| goto err; |
| } |
| /* the BSC creates the new sign links at this stage. */ |
| if (bfd->priv_nr == E1INP_SIGN_OML) { |
| sign_link = |
| line->ops->sign_link_up(&unit_data, line, |
| E1INP_SIGN_OML); |
| if (sign_link == NULL) { |
| LOGP(DLINP, LOGL_ERROR, |
| "Unable to set signal link, " |
| "closing socket.\n"); |
| goto err; |
| } |
| } else if (bfd->priv_nr == E1INP_SIGN_RSL) { |
| struct e1inp_ts *ts; |
| struct osmo_fd *newbfd; |
| struct e1inp_line *new_line; |
| |
| sign_link = |
| line->ops->sign_link_up(&unit_data, line, |
| E1INP_SIGN_RSL); |
| if (sign_link == NULL) { |
| LOGP(DLINP, LOGL_ERROR, |
| "Unable to set signal link, " |
| "closing socket.\n"); |
| goto err; |
| } |
| /* this is a bugtrap, the BSC should be using the |
| * virtual E1 line used by OML for this RSL link. */ |
| if (sign_link->ts->line == line) { |
| LOGP(DLINP, LOGL_ERROR, |
| "Fix your BSC, you should use the " |
| "E1 line used by the OML link for " |
| "your RSL link.\n"); |
| return 0; |
| } |
| /* Finally, we know which OML link is associated with |
| * this RSL link, attach it to this socket. */ |
| bfd->data = new_line = sign_link->ts->line; |
| e1inp_line_get(new_line); |
| ts = e1inp_line_ipa_rsl_ts(new_line, unit_data.trx_id); |
| newbfd = &ts->driver.ipaccess.fd; |
| |
| /* get rid of our old temporary bfd */ |
| /* preserve 'newbfd->when' flags potentially set by sign_link_up() */ |
| osmo_fd_setup(newbfd, bfd->fd, newbfd->when | bfd->when, bfd->cb, |
| bfd->data, E1INP_SIGN_RSL + unit_data.trx_id); |
| osmo_fd_unregister(bfd); |
| bfd->fd = -1; |
| ret = osmo_fd_register(newbfd); |
| if (ret < 0) { |
| LOGP(DLINP, LOGL_ERROR, |
| "could not register FD\n"); |
| goto err; |
| } |
| /* now we can release the dummy RSL line. */ |
| e1inp_line_put(line); |
| return 1; |
| } |
| break; |
| default: |
| LOGP(DLINP, LOGL_ERROR, "Unknown IPA message type\n"); |
| goto err; |
| } |
| return 0; |
| err: |
| osmo_fd_unregister(bfd); |
| close(bfd->fd); |
| bfd->fd = -1; |
| e1inp_line_put(line); |
| return -1; |
| } |
| |
| /* Returns -EBADF if bfd cannot be used by the caller anymore after return. */ |
| static int handle_ts1_read(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts; |
| struct e1inp_sign_link *link; |
| struct ipaccess_head *hh; |
| struct msgb *msg = NULL; |
| int ret, rc; |
| |
| if (bfd->priv_nr == E1INP_SIGN_OML) |
| e1i_ts = e1inp_line_ipa_oml_ts(line); |
| else |
| e1i_ts = e1inp_line_ipa_rsl_ts(line, bfd->priv_nr - E1INP_SIGN_RSL); |
| |
| ret = ipa_msg_recv_buffered(bfd->fd, &msg, &e1i_ts->pending_msg); |
| if (ret < 0) { |
| if (ret == -EAGAIN) |
| return 0; |
| LOGP(DLINP, LOGL_NOTICE, "Sign link problems, " |
| "closing socket. Reason: %s\n", strerror(-ret)); |
| goto err; |
| } else if (ret == 0) { |
| LOGP(DLINP, LOGL_NOTICE, "Sign link vanished, dead socket\n"); |
| goto err; |
| } |
| DEBUGP(DLMI, "RX %u: %s\n", ts_nr, osmo_hexdump(msgb_l2(msg), msgb_l2len(msg))); |
| |
| hh = (struct ipaccess_head *) msg->data; |
| if (hh->proto == IPAC_PROTO_IPACCESS) { |
| ret = ipaccess_rcvmsg(line, msg, bfd); |
| /* BIG FAT WARNING: bfd might no longer exist here (ret != 0), |
| * since ipaccess_rcvmsg() might have free'd it !!! */ |
| msgb_free(msg); |
| return ret != 0 ? -EBADF : 0; |
| } else if (e1i_ts->type == E1INP_TS_TYPE_NONE) { |
| /* this sign link is not know yet.. complain. */ |
| LOGP(DLINP, LOGL_ERROR, "Timeslot is not configured.\n"); |
| goto err_msg; |
| } |
| |
| link = e1inp_lookup_sign_link(e1i_ts, hh->proto, 0); |
| if (!link) { |
| LOGP(DLINP, LOGL_ERROR, "no matching signalling link for " |
| "hh->proto=0x%02x\n", hh->proto); |
| goto err_msg; |
| } |
| msg->dst = link; |
| |
| /* XXX better use e1inp_ts_rx? */ |
| if (!e1i_ts->line->ops->sign_link) { |
| LOGP(DLINP, LOGL_ERROR, "Fix your application, " |
| "no action set for signalling messages.\n"); |
| goto err_msg; |
| } |
| rc = e1i_ts->line->ops->sign_link(msg); |
| if (rc < 0) { |
| /* Don't close the signalling link if the upper layers report |
| * an error, that's too strict. BTW, the signalling layer is |
| * resposible for releasing the message. |
| */ |
| LOGP(DLINP, LOGL_ERROR, "Bad signalling message," |
| " sign_link returned error: %s.\n", strerror(-rc)); |
| } |
| |
| return rc; |
| err_msg: |
| msgb_free(msg); |
| err: |
| ipaccess_drop(bfd, line); |
| return -EBADF; |
| } |
| |
| static int ts_want_write(struct e1inp_ts *e1i_ts) |
| { |
| e1i_ts->driver.ipaccess.fd.when |= BSC_FD_WRITE; |
| |
| return 0; |
| } |
| |
| static void ipaccess_close(struct e1inp_sign_link *sign_link) |
| { |
| struct e1inp_ts *e1i_ts = sign_link->ts; |
| struct osmo_fd *bfd = &e1i_ts->driver.ipaccess.fd; |
| return e1inp_close_socket(e1i_ts, sign_link, bfd); |
| } |
| |
| static void timeout_ts1_write(void *data) |
| { |
| struct e1inp_ts *e1i_ts = (struct e1inp_ts *)data; |
| |
| /* trigger write of ts1, due to tx delay timer */ |
| ts_want_write(e1i_ts); |
| } |
| |
| static int __handle_ts1_write(struct osmo_fd *bfd, struct e1inp_line *line) |
| { |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts; |
| struct e1inp_sign_link *sign_link; |
| struct msgb *msg; |
| int ret; |
| |
| if (bfd->priv_nr == E1INP_SIGN_OML) |
| e1i_ts = e1inp_line_ipa_oml_ts(line); |
| else |
| e1i_ts = e1inp_line_ipa_rsl_ts(line, bfd->priv_nr - E1INP_SIGN_RSL); |
| |
| bfd->when &= ~BSC_FD_WRITE; |
| |
| /* get the next msg for this timeslot */ |
| msg = e1inp_tx_ts(e1i_ts, &sign_link); |
| if (!msg) { |
| /* no message after tx delay timer */ |
| return 0; |
| } |
| |
| switch (sign_link->type) { |
| case E1INP_SIGN_OML: |
| case E1INP_SIGN_RSL: |
| case E1INP_SIGN_OSMO: |
| break; |
| default: |
| bfd->when |= BSC_FD_WRITE; /* come back for more msg */ |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| msg->l2h = msg->data; |
| ipa_prepend_header(msg, sign_link->tei); |
| |
| DEBUGP(DLMI, "TX %u: %s\n", ts_nr, osmo_hexdump(msg->l2h, msgb_l2len(msg))); |
| |
| ret = send(bfd->fd, msg->data, msg->len, 0); |
| if (ret != msg->len) { |
| LOGP(DLINP, LOGL_ERROR, "failed to send A-bis IPA signalling " |
| "message. Reason: %s\n", strerror(errno)); |
| goto err; |
| } |
| |
| /* set tx delay timer for next event */ |
| osmo_timer_setup(&e1i_ts->sign.tx_timer, timeout_ts1_write, e1i_ts); |
| |
| /* Reducing this might break the nanoBTS 900 init. */ |
| osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, e1i_ts->sign.delay); |
| |
| out: |
| msgb_free(msg); |
| return ret; |
| err: |
| ipaccess_drop(bfd, line); |
| msgb_free(msg); |
| return ret; |
| } |
| |
| static int handle_ts1_write(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| |
| return __handle_ts1_write(bfd, line); |
| } |
| |
| static int ipaccess_bts_write_cb(struct ipa_client_conn *link) |
| { |
| struct e1inp_line *line = link->line; |
| |
| return __handle_ts1_write(link->ofd, line); |
| } |
| |
| /* callback from select.c in case one of the fd's can be read/written */ |
| int ipaccess_fd_cb(struct osmo_fd *bfd, unsigned int what) |
| { |
| int rc = 0; |
| |
| if (what & BSC_FD_READ) |
| rc = handle_ts1_read(bfd); |
| if (rc != -EBADF && (what & BSC_FD_WRITE)) |
| rc = handle_ts1_write(bfd); |
| |
| return rc; |
| } |
| |
| static int ipaccess_line_update(struct e1inp_line *line); |
| |
| struct e1inp_driver ipaccess_driver = { |
| .name = "ipa", |
| .want_write = ts_want_write, |
| .line_update = ipaccess_line_update, |
| .close = ipaccess_close, |
| .default_delay = 0, |
| .has_keepalive = 1, |
| }; |
| |
| static void update_fd_settings(struct e1inp_line *line, int fd) |
| { |
| int ret; |
| int val; |
| |
| if (line->keepalive_num_probes) { |
| /* Enable TCP keepalive to find out if the connection is gone */ |
| val = 1; |
| ret = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val)); |
| if (ret < 0) |
| LOGP(DLINP, LOGL_NOTICE, "Failed to set keepalive: %s\n", |
| strerror(errno)); |
| else |
| LOGP(DLINP, LOGL_NOTICE, "Keepalive is set: %i\n", ret); |
| |
| #if defined(TCP_KEEPIDLE) && defined(TCP_KEEPINTVL) && defined(TCP_KEEPCNT) |
| /* The following options are not portable! */ |
| val = line->keepalive_idle_timeout > 0 ? |
| line->keepalive_idle_timeout : |
| DEFAULT_TCP_KEEPALIVE_IDLE_TIMEOUT; |
| ret = setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, |
| &val, sizeof(val)); |
| if (ret < 0) |
| LOGP(DLINP, LOGL_NOTICE, |
| "Failed to set keepalive idle time: %s\n", |
| strerror(errno)); |
| val = line->keepalive_probe_interval > -1 ? |
| line->keepalive_probe_interval : |
| DEFAULT_TCP_KEEPALIVE_INTERVAL; |
| ret = setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, |
| &val, sizeof(val)); |
| if (ret < 0) |
| LOGP(DLINP, LOGL_NOTICE, |
| "Failed to set keepalive interval: %s\n", |
| strerror(errno)); |
| val = line->keepalive_num_probes > 0 ? |
| line->keepalive_num_probes : |
| DEFAULT_TCP_KEEPALIVE_RETRY_COUNT; |
| ret = setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, |
| &val, sizeof(val)); |
| if (ret < 0) |
| LOGP(DLINP, LOGL_NOTICE, |
| "Failed to set keepalive count: %s\n", |
| strerror(errno)); |
| #endif |
| } |
| } |
| |
| /* callback of the OML listening filedescriptor */ |
| static int ipaccess_bsc_oml_cb(struct ipa_server_link *link, int fd) |
| { |
| int ret; |
| int i; |
| struct e1inp_line *line; |
| struct e1inp_ts *e1i_ts; |
| struct osmo_fd *bfd; |
| |
| /* clone virtual E1 line for this new OML link. */ |
| line = e1inp_line_clone(tall_ipa_ctx, link->line); |
| if (line == NULL) { |
| LOGP(DLINP, LOGL_ERROR, "could not clone E1 line\n"); |
| return -ENOMEM; |
| } |
| |
| /* create virrtual E1 timeslots for signalling */ |
| e1inp_ts_config_sign(e1inp_line_ipa_oml_ts(line), line); |
| |
| /* initialize the fds */ |
| for (i = 0; i < ARRAY_SIZE(line->ts); ++i) |
| line->ts[i].driver.ipaccess.fd.fd = -1; |
| |
| e1i_ts = e1inp_line_ipa_oml_ts(line); |
| |
| bfd = &e1i_ts->driver.ipaccess.fd; |
| osmo_fd_setup(bfd, fd, BSC_FD_READ, ipaccess_fd_cb, line, E1INP_SIGN_OML); |
| ret = osmo_fd_register(bfd); |
| if (ret < 0) { |
| LOGP(DLINP, LOGL_ERROR, "could not register FD\n"); |
| goto err_line; |
| } |
| |
| update_fd_settings(line, bfd->fd); |
| |
| /* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */ |
| ret = ipa_ccm_send_id_req(bfd->fd); |
| if (ret < 0) { |
| LOGP(DLINP, LOGL_ERROR, "could not send ID REQ. Reason: %s\n", |
| strerror(errno)); |
| goto err_socket; |
| } |
| return ret; |
| |
| err_socket: |
| osmo_fd_unregister(bfd); |
| err_line: |
| close(bfd->fd); |
| bfd->fd = -1; |
| e1inp_line_put(line); |
| return ret; |
| } |
| |
| static int ipaccess_bsc_rsl_cb(struct ipa_server_link *link, int fd) |
| { |
| struct e1inp_line *line; |
| struct e1inp_ts *e1i_ts; |
| struct osmo_fd *bfd; |
| int i, ret; |
| |
| /* We don't know yet which OML link to associate it with. Thus, we |
| * allocate a temporary E1 line until we have received ID. */ |
| line = e1inp_line_clone(tall_ipa_ctx, link->line); |
| if (line == NULL) { |
| LOGP(DLINP, LOGL_ERROR, "could not clone E1 line\n"); |
| return -ENOMEM; |
| } |
| /* initialize the fds */ |
| for (i = 0; i < ARRAY_SIZE(line->ts); ++i) |
| line->ts[i].driver.ipaccess.fd.fd = -1; |
| |
| /* we need this to initialize this in case to avoid crashes in case |
| * that the socket is closed before we've seen an ID_RESP. */ |
| e1inp_ts_config_sign(e1inp_line_ipa_oml_ts(line), line); |
| |
| e1i_ts = e1inp_line_ipa_rsl_ts(line, 0); |
| |
| bfd = &e1i_ts->driver.ipaccess.fd; |
| osmo_fd_setup(bfd, fd, BSC_FD_READ, ipaccess_fd_cb, line, E1INP_SIGN_RSL); |
| ret = osmo_fd_register(bfd); |
| if (ret < 0) { |
| LOGP(DLINP, LOGL_ERROR, "could not register FD\n"); |
| goto err_line; |
| } |
| /* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */ |
| ret = ipa_ccm_send_id_req(bfd->fd); |
| if (ret < 0) { |
| LOGP(DLINP, LOGL_ERROR, "could not send ID REQ. Reason: %s\n", |
| strerror(errno)); |
| goto err_socket; |
| } |
| update_fd_settings(line, bfd->fd); |
| return ret; |
| |
| err_socket: |
| osmo_fd_unregister(bfd); |
| err_line: |
| close(bfd->fd); |
| bfd->fd = -1; |
| e1inp_line_put(line); |
| return ret; |
| } |
| |
| #define IPA_STRING_MAX 64 |
| |
| static struct msgb * |
| ipa_bts_id_resp(const struct ipaccess_unit *dev, uint8_t *data, int len, int trx_nr) |
| { |
| struct msgb *nmsg; |
| char str[IPA_STRING_MAX]; |
| uint8_t *tag; |
| |
| memset(str, 0, sizeof(str)); |
| |
| nmsg = ipa_msg_alloc(0); |
| if (!nmsg) |
| return NULL; |
| |
| *msgb_put(nmsg, 1) = IPAC_MSGT_ID_RESP; |
| while (len) { |
| if (len < 2) { |
| LOGP(DLINP, LOGL_NOTICE, |
| "Short read of ipaccess tag\n"); |
| msgb_free(nmsg); |
| return NULL; |
| } |
| switch (data[1]) { |
| case IPAC_IDTAG_UNIT: |
| snprintf(str, sizeof(str), "%u/%u/%u", |
| dev->site_id, dev->bts_id, trx_nr); |
| break; |
| case IPAC_IDTAG_MACADDR: |
| snprintf(str, sizeof(str), |
| "%02x:%02x:%02x:%02x:%02x:%02x", |
| dev->mac_addr[0], dev->mac_addr[1], |
| dev->mac_addr[2], dev->mac_addr[3], |
| dev->mac_addr[4], dev->mac_addr[5]); |
| break; |
| case IPAC_IDTAG_LOCATION1: |
| if (dev->location1) |
| osmo_strlcpy(str, dev->location1, sizeof(str)); |
| break; |
| case IPAC_IDTAG_LOCATION2: |
| if (dev->location2) |
| osmo_strlcpy(str, dev->location2, sizeof(str)); |
| break; |
| case IPAC_IDTAG_EQUIPVERS: |
| if (dev->equipvers) |
| osmo_strlcpy(str, dev->equipvers, sizeof(str)); |
| break; |
| case IPAC_IDTAG_SWVERSION: |
| if (dev->swversion) |
| osmo_strlcpy(str, dev->swversion, sizeof(str)); |
| break; |
| case IPAC_IDTAG_UNITNAME: |
| snprintf(str, sizeof(str), |
| "%s-%02x-%02x-%02x-%02x-%02x-%02x", |
| dev->unit_name, |
| dev->mac_addr[0], dev->mac_addr[1], |
| dev->mac_addr[2], dev->mac_addr[3], |
| dev->mac_addr[4], dev->mac_addr[5]); |
| break; |
| case IPAC_IDTAG_SERNR: |
| if (dev->serno) |
| osmo_strlcpy(str, dev->serno, sizeof(str)); |
| break; |
| default: |
| LOGP(DLINP, LOGL_NOTICE, |
| "Unknown ipaccess tag 0x%02x\n", *data); |
| msgb_free(nmsg); |
| return NULL; |
| } |
| |
| LOGP(DLINP, LOGL_INFO, " tag %d: %s\n", data[1], str); |
| tag = msgb_put(nmsg, 3 + strlen(str) + 1); |
| tag[0] = 0x00; |
| tag[1] = 1 + strlen(str) + 1; |
| tag[2] = data[1]; |
| memcpy(tag + 3, str, strlen(str) + 1); |
| data += 2; |
| len -= 2; |
| } |
| ipa_msg_push_header(nmsg, IPAC_PROTO_IPACCESS); |
| return nmsg; |
| } |
| |
| static struct msgb *ipa_bts_id_ack(void) |
| { |
| struct msgb *nmsg2; |
| |
| nmsg2 = ipa_msg_alloc(0); |
| if (!nmsg2) |
| return NULL; |
| |
| *msgb_put(nmsg2, 1) = IPAC_MSGT_ID_ACK; |
| ipa_msg_push_header(nmsg2, IPAC_PROTO_IPACCESS); |
| |
| return nmsg2; |
| } |
| |
| static void ipaccess_bts_updown_cb(struct ipa_client_conn *link, int up) |
| { |
| struct e1inp_line *line = link->line; |
| |
| if (up) |
| return; |
| |
| if (line->ops->sign_link_down) |
| line->ops->sign_link_down(line); |
| } |
| |
| /* handle incoming message to BTS, check if it is an IPA CCM, and if yes, |
| * handle it accordingly (PING/PONG/ID_REQ/ID_RESP/ID_ACK) */ |
| int ipaccess_bts_handle_ccm(struct ipa_client_conn *link, |
| struct ipaccess_unit *dev, struct msgb *msg) |
| { |
| struct ipaccess_head *hh = (struct ipaccess_head *) msg->data; |
| struct msgb *rmsg; |
| int ret = 0; |
| |
| /* special handling for IPA CCM. */ |
| if (hh->proto == IPAC_PROTO_IPACCESS) { |
| uint8_t msg_type = *(msg->l2h); |
| |
| /* ping, pong and acknowledgment cases. */ |
| ret = ipa_ccm_rcvmsg_bts_base(msg, link->ofd); |
| if (ret < 0) |
| goto err; |
| |
| /* this is a request for identification from the BSC. */ |
| if (msg_type == IPAC_MSGT_ID_GET) { |
| uint8_t *data = msgb_l2(msg); |
| int len = msgb_l2len(msg); |
| int trx_nr = 0; |
| |
| if (link->ofd->priv_nr >= E1INP_SIGN_RSL) |
| trx_nr = link->ofd->priv_nr - E1INP_SIGN_RSL; |
| |
| LOGP(DLINP, LOGL_NOTICE, "received ID get from %u/%u/%u\n", |
| dev->site_id, dev->bts_id, trx_nr); |
| rmsg = ipa_bts_id_resp(dev, data + 1, len - 1, trx_nr); |
| ret = ipa_send(link->ofd->fd, rmsg->data, rmsg->len); |
| if (ret != rmsg->len) { |
| LOGP(DLINP, LOGL_ERROR, "cannot send ID_RESP " |
| "message. Reason: %s\n", strerror(errno)); |
| goto err_rmsg; |
| } |
| msgb_free(rmsg); |
| |
| /* send ID_ACK. */ |
| rmsg = ipa_bts_id_ack(); |
| ret = ipa_send(link->ofd->fd, rmsg->data, rmsg->len); |
| if (ret != rmsg->len) { |
| LOGP(DLINP, LOGL_ERROR, "cannot send ID_ACK " |
| "message. Reason: %s\n", strerror(errno)); |
| goto err_rmsg; |
| } |
| msgb_free(rmsg); |
| } |
| return 1; |
| } |
| |
| return 0; |
| |
| err_rmsg: |
| msgb_free(rmsg); |
| err: |
| ipa_client_conn_close(link); |
| return -1; |
| } |
| |
| static int ipaccess_bts_read_cb(struct ipa_client_conn *link, struct msgb *msg) |
| { |
| struct ipaccess_head *hh = (struct ipaccess_head *) msg->data; |
| struct e1inp_ts *e1i_ts = NULL; |
| struct e1inp_sign_link *sign_link; |
| uint8_t msg_type = *(msg->l2h); |
| int ret = 0; |
| |
| /* special handling for IPA CCM. */ |
| if (hh->proto == IPAC_PROTO_IPACCESS) { |
| /* this is a request for identification from the BSC. */ |
| if (msg_type == IPAC_MSGT_ID_GET) { |
| if (!link->line->ops->sign_link_up) { |
| LOGP(DLINP, LOGL_ERROR, |
| "Unable to set signal link, " |
| "closing socket.\n"); |
| goto err; |
| } |
| } |
| } |
| |
| /* core CCM handling */ |
| ret = ipaccess_bts_handle_ccm(link, link->line->ops->cfg.ipa.dev, msg); |
| if (ret < 0) |
| goto err; |
| |
| if (ret == 1 && hh->proto == IPAC_PROTO_IPACCESS) { |
| if (msg_type == IPAC_MSGT_ID_GET) { |
| sign_link = link->line->ops->sign_link_up(msg, |
| link->line, |
| link->ofd->priv_nr); |
| if (sign_link == NULL) { |
| LOGP(DLINP, LOGL_ERROR, |
| "Unable to set signal link, " |
| "closing socket.\n"); |
| goto err; |
| } |
| } |
| msgb_free(msg); |
| return ret; |
| } else if (link->port == IPA_TCP_PORT_OML) |
| e1i_ts = e1inp_line_ipa_oml_ts(link->line); |
| else if (link->port == IPA_TCP_PORT_RSL) |
| e1i_ts = e1inp_line_ipa_rsl_ts(link->line, link->ofd->priv_nr - E1INP_SIGN_RSL); |
| |
| OSMO_ASSERT(e1i_ts != NULL); |
| |
| if (e1i_ts->type == E1INP_TS_TYPE_NONE) { |
| LOGP(DLINP, LOGL_ERROR, "Signalling link not initialized. Discarding." |
| " port=%u msg_type=%u\n", link->port, msg_type); |
| goto err; |
| } |
| |
| /* look up for some existing signaling link. */ |
| sign_link = e1inp_lookup_sign_link(e1i_ts, hh->proto, 0); |
| if (sign_link == NULL) { |
| LOGP(DLINP, LOGL_ERROR, "no matching signalling link for " |
| "hh->proto=0x%02x\n", hh->proto); |
| goto err; |
| } |
| msg->dst = sign_link; |
| |
| /* XXX better use e1inp_ts_rx? */ |
| if (!link->line->ops->sign_link) { |
| LOGP(DLINP, LOGL_ERROR, "Fix your application, " |
| "no action set for signalling messages.\n"); |
| goto err; |
| } |
| return link->line->ops->sign_link(msg); |
| |
| err: |
| ipa_client_conn_close(link); |
| msgb_free(msg); |
| return -EBADF; |
| } |
| |
| struct ipaccess_line { |
| int line_already_initialized; |
| }; |
| |
| static int ipaccess_line_update(struct e1inp_line *line) |
| { |
| int ret = -ENOENT; |
| struct ipaccess_line *il; |
| |
| if (!line->driver_data) |
| line->driver_data = talloc_zero(line, struct ipaccess_line); |
| |
| if (!line->driver_data) { |
| LOGP(DLINP, LOGL_ERROR, "ipaccess: OOM in line update\n"); |
| return -ENOMEM; |
| } |
| il = line->driver_data; |
| |
| /* We only initialize this line once. */ |
| if (il->line_already_initialized) |
| return 0; |
| |
| il->line_already_initialized = 1; |
| |
| switch(line->ops->cfg.ipa.role) { |
| case E1INP_LINE_R_BSC: { |
| struct ipa_server_link *oml_link, *rsl_link; |
| const char *ipa = e1inp_ipa_get_bind_addr(); |
| |
| LOGP(DLINP, LOGL_NOTICE, "enabling ipaccess BSC mode on %s " |
| "with OML %u and RSL %u TCP ports\n", ipa, |
| IPA_TCP_PORT_OML, IPA_TCP_PORT_RSL); |
| |
| oml_link = ipa_server_link_create(tall_ipa_ctx, line, ipa, |
| IPA_TCP_PORT_OML, |
| ipaccess_bsc_oml_cb, NULL); |
| if (oml_link == NULL) { |
| LOGP(DLINP, LOGL_ERROR, "cannot create OML " |
| "BSC link: %s\n", strerror(errno)); |
| return -ENOMEM; |
| } |
| if (ipa_server_link_open(oml_link) < 0) { |
| LOGP(DLINP, LOGL_ERROR, "cannot open OML BSC link: %s\n", |
| strerror(errno)); |
| ipa_server_link_destroy(oml_link); |
| return -EIO; |
| } |
| rsl_link = ipa_server_link_create(tall_ipa_ctx, line, ipa, |
| IPA_TCP_PORT_RSL, |
| ipaccess_bsc_rsl_cb, NULL); |
| if (rsl_link == NULL) { |
| LOGP(DLINP, LOGL_ERROR, "cannot create RSL " |
| "BSC link: %s\n", strerror(errno)); |
| return -ENOMEM; |
| } |
| if (ipa_server_link_open(rsl_link) < 0) { |
| LOGP(DLINP, LOGL_ERROR, "cannot open RSL BSC link: %s\n", |
| strerror(errno)); |
| ipa_server_link_destroy(rsl_link); |
| return -EIO; |
| } |
| ret = 0; |
| break; |
| } |
| case E1INP_LINE_R_BTS: { |
| struct ipa_client_conn *link; |
| |
| LOGP(DLINP, LOGL_NOTICE, "enabling ipaccess BTS mode, " |
| "OML connecting to %s:%u\n", line->ops->cfg.ipa.addr, |
| IPA_TCP_PORT_OML); |
| |
| link = ipa_client_conn_create(tall_ipa_ctx, |
| e1inp_line_ipa_oml_ts(line), |
| E1INP_SIGN_OML, |
| line->ops->cfg.ipa.addr, |
| IPA_TCP_PORT_OML, |
| ipaccess_bts_updown_cb, |
| ipaccess_bts_read_cb, |
| ipaccess_bts_write_cb, |
| line); |
| if (link == NULL) { |
| LOGP(DLINP, LOGL_ERROR, "cannot create OML " |
| "BTS link: %s\n", strerror(errno)); |
| return -ENOMEM; |
| } |
| if (ipa_client_conn_open(link) < 0) { |
| LOGP(DLINP, LOGL_ERROR, "cannot open OML BTS link: %s\n", |
| strerror(errno)); |
| ipa_client_conn_close(link); |
| ipa_client_conn_destroy(link); |
| return -EIO; |
| } |
| ret = 0; |
| break; |
| } |
| default: |
| break; |
| } |
| return ret; |
| } |
| |
| |
| /* backwards compatibility */ |
| int e1inp_ipa_bts_rsl_connect(struct e1inp_line *line, |
| const char *rem_addr, uint16_t rem_port) |
| { |
| return e1inp_ipa_bts_rsl_connect_n(line, rem_addr, rem_port, 0); |
| } |
| |
| int e1inp_ipa_bts_rsl_connect_n(struct e1inp_line *line, |
| const char *rem_addr, uint16_t rem_port, |
| uint8_t trx_nr) |
| { |
| struct ipa_client_conn *rsl_link; |
| |
| if (E1INP_SIGN_RSL+trx_nr-1 >= NUM_E1_TS) { |
| LOGP(DLINP, LOGL_ERROR, "cannot create RSL BTS link: " |
| "trx_nr (%d) out of range\n", trx_nr); |
| return -EINVAL; |
| } |
| |
| rsl_link = ipa_client_conn_create(tall_ipa_ctx, |
| e1inp_line_ipa_rsl_ts(line, trx_nr), |
| E1INP_SIGN_RSL+trx_nr, |
| rem_addr, rem_port, |
| ipaccess_bts_updown_cb, |
| ipaccess_bts_read_cb, |
| ipaccess_bts_write_cb, |
| line); |
| if (rsl_link == NULL) { |
| LOGP(DLINP, LOGL_ERROR, "cannot create RSL " |
| "BTS link: %s\n", strerror(errno)); |
| return -ENOMEM; |
| } |
| if (ipa_client_conn_open(rsl_link) < 0) { |
| LOGP(DLINP, LOGL_ERROR, "cannot open RSL BTS link: %s\n", |
| strerror(errno)); |
| ipa_client_conn_close(rsl_link); |
| ipa_client_conn_destroy(rsl_link); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| void e1inp_ipaccess_init(void) |
| { |
| tall_ipa_ctx = talloc_named_const(libosmo_abis_ctx, 1, "ipa"); |
| e1inp_driver_register(&ipaccess_driver); |
| } |
| |
| void e1inp_ipa_set_bind_addr(const char *ip_bind_addr) |
| { |
| talloc_free((char*)ipaccess_driver.bind_addr); |
| ipaccess_driver.bind_addr = NULL; |
| |
| if (ip_bind_addr) |
| ipaccess_driver.bind_addr = talloc_strdup(tall_ipa_ctx, |
| ip_bind_addr); |
| } |
| |
| const char *e1inp_ipa_get_bind_addr(void) |
| { |
| return ipaccess_driver.bind_addr? |
| ipaccess_driver.bind_addr |
| : "0.0.0.0"; |
| } |