/* OpenBSC Abis input driver for ip.access */ /* (C) 2009-2021 by Harald Welte * (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 . * */ #include "internal.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* global parameters of IPA input driver */ struct ipa_pars g_e1inp_ipaccess_pars; 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 inline struct e1inp_ts *ipaccess_line_ts(struct osmo_fd *bfd, struct e1inp_line *line) { if (bfd->priv_nr == E1INP_SIGN_OML) return e1inp_line_ipa_oml_ts(line); else return e1inp_line_ipa_rsl_ts(line, bfd->priv_nr - E1INP_SIGN_RSL); } static inline void ipaccess_keepalive_fsm_cleanup(struct e1inp_ts *e1i_ts) { struct osmo_fsm_inst *ka_fsm; ka_fsm = e1i_ts->driver.ipaccess.ka_fsm; if (ka_fsm) { osmo_fsm_inst_term(ka_fsm, OSMO_FSM_TERM_REQUEST, NULL); e1i_ts->driver.ipaccess.ka_fsm = NULL; } } static int ipaccess_drop(struct osmo_fd *bfd, struct e1inp_line *line) { int ret = 1; struct e1inp_ts *e1i_ts = ipaccess_line_ts(bfd, line); e1inp_line_get2(line, __func__); ipaccess_keepalive_fsm_cleanup(e1i_ts); /* Error case: we did not see any ID_RESP yet for this socket. */ if (bfd->fd != -1) { LOGPITS(e1i_ts, DLINP, LOGL_NOTICE, "Forcing socket shutdown\n"); osmo_fd_unregister(bfd); close(bfd->fd); bfd->fd = -1; switch (line->ops->cfg.ipa.role) { case E1INP_LINE_R_BSC: /* This is BSC code, ipaccess_drop() is only called for accepted() sockets, hence the bfd holds a reference to e1inp_line in ->data that needs to be released */ OSMO_ASSERT(bfd->data == line); bfd->data = NULL; e1inp_line_put2(line, "ipa_bfd"); break; case E1INP_LINE_R_BTS: /* BTS code: bfd->data contains pointer to struct * ipa_client_conn. Leave it alive so it reconnects. */ break; default: break; } ret = -ENOENT; } else { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Forcing socket shutdown with no signal link set\n"); } msgb_free(e1i_ts->pending_msg); e1i_ts->pending_msg = NULL; /* e1inp_sign_link_destroy releases the socket descriptors for us. */ if (line->ops->sign_link_down) line->ops->sign_link_down(line); e1inp_line_put2(line, __func__); return ret; } static void ipa_bsc_keepalive_write_server_cb(struct osmo_fsm_inst *fi, void *conn, struct msgb *msg) { struct osmo_fd *bfd = (struct osmo_fd *)conn; write(bfd->fd, msg->data, msg->len); msgb_free(msg); } static int ipa_bsc_keepalive_timeout_cb(struct osmo_fsm_inst *fi, void *data) { struct osmo_fd *bfd = (struct osmo_fd *)data; if (bfd->fd == -1) return 1; ipaccess_drop(bfd, (struct e1inp_line *)bfd->data); return 1; } static void ipaccess_bsc_keepalive_fsm_alloc(struct e1inp_ts *e1i_ts, struct osmo_fd *bfd, const char *id) { struct e1inp_line *line = e1i_ts->line; struct osmo_fsm_inst *ka_fsm; ipaccess_keepalive_fsm_cleanup(e1i_ts); if (!line->ipa_kap) return; ka_fsm = ipa_generic_conn_alloc_keepalive_fsm(tall_ipa_ctx, bfd, line->ipa_kap, id); e1i_ts->driver.ipaccess.ka_fsm = ka_fsm; if (!ka_fsm) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Failed to allocate IPA keepalive FSM\n"); return; } ipa_keepalive_fsm_set_timeout_cb(ka_fsm, ipa_bsc_keepalive_timeout_cb); ipa_keepalive_fsm_set_send_cb(ka_fsm, ipa_bsc_keepalive_write_server_cb); ipa_keepalive_fsm_start(ka_fsm); } static void ipa_bts_keepalive_write_client_cb(struct osmo_fsm_inst *fi, void *conn, struct msgb *msg) { struct ipa_client_conn *link = (struct ipa_client_conn *)conn; int ret = 0; ret = ipa_send(link->ofd->fd, msg->data, msg->len); if (ret != msg->len) { LOGP(DLINP, LOGL_ERROR, "cannot send message. Reason: %s\n", strerror(errno)); } msgb_free(msg); } static void update_fd_settings(struct e1inp_line *line, int fd); static void ipaccess_bts_updown_cb(struct ipa_client_conn *link, int up); static int ipa_bts_keepalive_timeout_cb(struct osmo_fsm_inst *fi, void *conn) { ipaccess_bts_updown_cb(conn, false); return 1; } static void ipaccess_bts_keepalive_fsm_alloc(struct e1inp_ts *e1i_ts, struct ipa_client_conn *client, const char *id) { struct e1inp_line *line = e1i_ts->line; struct osmo_fsm_inst *ka_fsm; OSMO_ASSERT(e1i_ts->driver.ipaccess.ka_fsm == NULL); if (!line->ipa_kap) return; ka_fsm = ipa_client_conn_alloc_keepalive_fsm(client, line->ipa_kap, id); e1i_ts->driver.ipaccess.ka_fsm = ka_fsm; if (!ka_fsm) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Failed to allocate IPA keepalive FSM\n"); return; } ipa_keepalive_fsm_set_timeout_cb(ka_fsm, ipa_bts_keepalive_timeout_cb); ipa_keepalive_fsm_set_send_cb(ka_fsm, ipa_bts_keepalive_write_client_cb); } /* 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; struct e1inp_ts *e1i_ts; struct osmo_fsm_inst *ka_fsm; /* peek the pong for our keepalive fsm */ e1i_ts = ipaccess_line_ts(bfd, line); ka_fsm = e1i_ts->driver.ipaccess.ka_fsm; if (ka_fsm && msg_type == IPAC_MSGT_PONG) ipa_keepalive_fsm_pong_received(ka_fsm); /* 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: LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Unexpected return from ipa_ccm_rcvmsg_base (ret=%d)\n", ret); goto err; } switch (msg_type) { case IPAC_MSGT_ID_RESP: LOGPITS(e1i_ts, DLMI, LOGL_DEBUG, "ID_RESP "); /* parse tags, search for Unit ID */ ret = ipa_ccm_id_resp_parse(&tlvp, (const uint8_t *)msg->l2h+1, msgb_l2len(msg)-1); DEBUGPC(DLMI, "\n"); if (ret < 0) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "IPA response message with malformed TLVs\n"); goto err; } if (!TLVP_PRESENT(&tlvp, IPAC_IDTAG_UNIT)) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "IPA response message without unit ID\n"); goto err; } len = TLVP_LEN(&tlvp, IPAC_IDTAG_UNIT); if (len < 1) { LOGPITS(e1i_ts, 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'; ret = ipa_parse_unitid(unitid, &unit_data); if (ret) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Failed to parse unit ID '%s'\n", unitid); goto err; } if (!line->ops->sign_link_up) { LOGPITS(e1i_ts, 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) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Unable to set signal link, closing socket.\n"); goto err; } ipaccess_bsc_keepalive_fsm_alloc(e1i_ts, bfd, "oml_bsc_to_bts"); } else if (bfd->priv_nr == E1INP_SIGN_RSL) { struct e1inp_ts *ts; struct osmo_fd *newbfd; struct e1inp_line *new_line; char tcp_stat_name[64]; sign_link = line->ops->sign_link_up(&unit_data, line, E1INP_SIGN_RSL); if (sign_link == NULL) { LOGPIL(line, DLINP, LOGL_ERROR, "Unable to set signal link, closing socket.\n"); goto err; } /* Finally, we know which OML link is associated with * this RSL link, attach it to this socket. */ new_line = sign_link->ts->line; /* this is a bugtrap, the BSC should be using the * virtual E1 line used by OML for this RSL link. */ if (new_line == line) { LOGPIL(line, DLINP, LOGL_ERROR, "Fix your BSC, you should use the " "E1 line used by the OML link for your RSL link.\n"); return 0; } e1inp_line_get2(new_line, "ipa_bfd"); ts = e1inp_line_ipa_rsl_ts(new_line, unit_data.trx_id); newbfd = &ts->driver.ipaccess.fd; OSMO_ASSERT(newbfd != bfd); /* preserve 'newbfd->when' flags potentially set by sign_link_up() */ osmo_fd_setup(newbfd, bfd->fd, newbfd->when | bfd->when, bfd->cb, new_line, E1INP_SIGN_RSL + unit_data.trx_id); /* now we can release the dummy RSL line (old temporary bfd). */ osmo_fd_unregister(bfd); bfd->fd = -1; /* bfd->data holds a reference to line, drop it */ OSMO_ASSERT(bfd->data == line); bfd->data = NULL; e1inp_line_put2(line, "ipa_bfd"); ret = osmo_fd_register(newbfd); if (ret < 0) { LOGPITS(ts, DLINP, LOGL_ERROR, "could not register FD\n"); goto err; } snprintf(tcp_stat_name, sizeof(tcp_stat_name), "site.%u.bts.%u.ipa-rsl.%u", unit_data.site_id, unit_data.bts_id, unit_data.trx_id); osmo_stats_tcp_osmo_fd_register(newbfd, tcp_stat_name); e1i_ts = ipaccess_line_ts(newbfd, new_line); ipaccess_bsc_keepalive_fsm_alloc(e1i_ts, newbfd, "rsl_bsc_to_bts"); return 1; } break; default: LOGPIL(line, DLINP, LOGL_ERROR, "Unknown IPA message type\n"); goto err; } return 0; err: if (bfd->fd != -1) { osmo_fd_unregister(bfd); close(bfd->fd); bfd->fd = -1; /* This is a BSC accepted socket, bfd->data holds a reference to line, drop it */ OSMO_ASSERT(bfd->data == line); bfd->data = NULL; e1inp_line_put2(line, "ipa_bfd"); } 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; e1i_ts = ipaccess_line_ts(bfd, line); ret = ipa_msg_recv_buffered(bfd->fd, &msg, &e1i_ts->pending_msg); if (ret < 0) { if (ret == -EAGAIN) return 0; LOGPITS(e1i_ts, DLINP, LOGL_NOTICE, "Sign link problems, closing socket. Reason: %s\n", strerror(-ret)); goto err; } else if (ret == 0) { LOGPITS(e1i_ts, DLINP, LOGL_NOTICE, "Sign link vanished, dead socket\n"); goto err; } LOGPITS(e1i_ts, DLMI, LOGL_DEBUG, "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. */ LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Timeslot is not configured.\n"); goto err_msg; } link = e1inp_lookup_sign_link(e1i_ts, hh->proto, 0); if (!link) { LOGPITS(e1i_ts, 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) { LOGPITS(e1i_ts, 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. */ LOGPITS(e1i_ts, 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) { osmo_fd_write_enable(&e1i_ts->driver.ipaccess.fd); 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; struct e1inp_line *line = e1i_ts->line; struct osmo_fsm_inst *ka_fsm = e1i_ts->driver.ipaccess.ka_fsm; /* depending on caller the fsm might be dead */ if (ka_fsm) ipa_keepalive_fsm_stop(ka_fsm); e1inp_int_snd_event(e1i_ts, sign_link, S_L_INP_TEI_DN); /* the first e1inp_sign_link_destroy call closes the socket. */ if (bfd->fd != -1) { osmo_fd_unregister(bfd); close(bfd->fd); bfd->fd = -1; /* If The bfd holds a reference to e1inp_line in ->data (BSC * accepted() sockets), then release it */ if (bfd->data == line) { bfd->data = NULL; e1inp_line_put2(line, "ipa_bfd"); } } } static bool e1i_ts_has_pending_tx_msgs(struct e1inp_ts *e1i_ts) { struct e1inp_sign_link *link; llist_for_each_entry(link, &e1i_ts->sign.sign_links, list) { if (!llist_empty(&link->tx_list)) { return true; } } return false; } 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 */ if (e1i_ts_has_pending_tx_msgs(e1i_ts)) 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; e1i_ts = ipaccess_line_ts(bfd, line); /* get the next msg for this timeslot */ msg = e1inp_tx_ts(e1i_ts, &sign_link); if (!msg) { /* no message after tx delay timer */ osmo_fd_write_disable(bfd); return 0; } switch (sign_link->type) { case E1INP_SIGN_OML: case E1INP_SIGN_RSL: case E1INP_SIGN_OSMO: break; default: /* leave WRITE flag enabled, come back for more msg */ ret = -EINVAL; goto out; } msg->l2h = msg->data; ipa_prepend_header(msg, sign_link->tei); LOGPITS(e1i_ts, DLMI, LOGL_DEBUG, "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) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "failed to send A-bis IPA signalling " "message. Reason: %s\n", strerror(errno)); goto err; } /* this is some ancient code that apparently exists to slow down writes towards * some even more ancient nanoBTS 900 units. See git commit * d49fc5ae24fc9d44d2b284392ab619cc7a69a876 of openbsc.git (now osmo-bsc.git) */ if (e1i_ts->sign.delay) { osmo_fd_write_disable(bfd); /* set tx delay timer for next event */ osmo_timer_setup(&e1i_ts->sign.tx_timer, timeout_ts1_write, e1i_ts); osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, e1i_ts->sign.delay); } else { out: if (!e1i_ts_has_pending_tx_msgs(e1i_ts)) osmo_fd_write_disable(bfd); } 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 & OSMO_FD_READ) rc = handle_ts1_read(bfd); if (rc != -EBADF && (what & OSMO_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, idle_val, interval_val, retry_count_val, user_timeout_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) LOGPIL(line, DLINP, LOGL_ERROR, "Failed to enable TCP keepalive: %s\n", strerror(errno)); else LOGPIL(line, DLINP, LOGL_NOTICE, "TCP Keepalive is enabled\n"); idle_val = line->keepalive_idle_timeout > 0 ? line->keepalive_idle_timeout : DEFAULT_TCP_KEEPALIVE_IDLE_TIMEOUT; interval_val = line->keepalive_probe_interval > -1 ? line->keepalive_probe_interval : DEFAULT_TCP_KEEPALIVE_INTERVAL; retry_count_val = line->keepalive_num_probes > 0 ? line->keepalive_num_probes : DEFAULT_TCP_KEEPALIVE_RETRY_COUNT; user_timeout_val = 1000 * retry_count_val * (interval_val + idle_val); LOGPIL(line, DLINP, LOGL_NOTICE, "TCP keepalive idle_timeout=%us, interval=%us, retry_count=%u " "user_timeout=%ums\n", idle_val, interval_val, retry_count_val, user_timeout_val); /* The following options are not portable! */ ret = setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &idle_val, sizeof(idle_val)); if (ret < 0) { LOGPIL(line, DLINP, LOGL_ERROR, "Failed to set TCP keepalive idle time: %s\n", strerror(errno)); } ret = setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &interval_val, sizeof(interval_val)); if (ret < 0) { LOGPIL(line, DLINP, LOGL_ERROR, "Failed to set TCP keepalive interval: %s\n", strerror(errno)); } ret = setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &retry_count_val, sizeof(retry_count_val)); if (ret < 0) LOGPIL(line, DLINP, LOGL_ERROR, "Failed to set TCP keepalive count: %s\n", strerror(errno)); ret = setsockopt(fd, IPPROTO_TCP, TCP_USER_TIMEOUT, &user_timeout_val, sizeof(user_timeout_val)); if (ret < 0) LOGPIL(line, DLINP, LOGL_ERROR, "Failed to set TCP user timeout: %s\n", strerror(errno)); } val = 1; ret = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)); if (ret < 0) LOGPIL(line, DLINP, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); } /* 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, "ipa_bfd"); 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, OSMO_FD_READ, ipaccess_fd_cb, line, E1INP_SIGN_OML); ret = osmo_fd_register(bfd); if (ret < 0) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "could not register FD\n"); goto err_line; } osmo_stats_tcp_osmo_fd_register(bfd, "ipa-oml"); 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) { LOGPITS(e1i_ts, 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; bfd->data = NULL; e1inp_line_put2(line, "ipa_bfd"); 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, "ipa_bfd"); 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, OSMO_FD_READ, ipaccess_fd_cb, line, E1INP_SIGN_RSL); ret = osmo_fd_register(bfd); if (ret < 0) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "could not register FD\n"); goto err_line; } osmo_stats_tcp_osmo_fd_register(bfd, "ipa-rsl"); /* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */ ret = ipa_ccm_send_id_req(bfd->fd); if (ret < 0) { LOGPITS(e1i_ts, 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; bfd->data = NULL; e1inp_line_put2(line, "ipa_bfd"); return ret; } static void ipaccess_bts_updown_cb(struct ipa_client_conn *link, int up) { struct e1inp_line *line = link->line; struct e1inp_ts *e1i_ts = ipaccess_line_ts(link->ofd, line); if (up) { struct osmo_fsm_inst *ka_fsm = e1i_ts->driver.ipaccess.ka_fsm; update_fd_settings(line, link->ofd->fd); if (ka_fsm && line->ipa_kap) ipa_keepalive_fsm_start(ka_fsm); return; } ipaccess_keepalive_fsm_cleanup(e1i_ts); 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; /* special handling for IPA CCM. */ if (hh->proto != IPAC_PROTO_IPACCESS) return 0; int ret = 0; uint8_t *data = msgb_l2(msg); int len = msgb_l2len(msg); OSMO_ASSERT(len > 0); uint8_t msg_type = *data; /* line might not exist if != bsc||bts */ struct e1inp_line *line = link->line; /* peek the pong for our keepalive fsm */ if (line && msg_type == IPAC_MSGT_PONG) { struct osmo_fsm_inst *ka_fsm = ipaccess_line_ts(link->ofd, line)->driver.ipaccess.ka_fsm; ipa_keepalive_fsm_pong_received(ka_fsm); } /* 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) { struct msgb *rmsg; /* The ipaccess_unit dev holds generic identity for the whole * line, hence no trx_id. Patch ipaccess_unit during call to * ipa_ccm_make_id_resp_from_req() to identify this TRX: */ int store_trx_nr = dev->trx_id; if (link->ofd->priv_nr >= E1INP_SIGN_RSL) dev->trx_id = link->ofd->priv_nr - E1INP_SIGN_RSL; else dev->trx_id = 0; LOGP(DLINP, LOGL_NOTICE, "received ID_GET for unit ID %u/%u/%u\n", dev->site_id, dev->bts_id, dev->trx_id); rmsg = ipa_ccm_make_id_resp_from_req(dev, data + 1, len - 1); dev->trx_id = store_trx_nr; if (!rmsg) { LOGP(DLINP, LOGL_ERROR, "Failed parsing ID_GET message.\n"); goto err; } 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)); msgb_free(rmsg); goto err; } msgb_free(rmsg); /* send ID_ACK. */ ret = ipa_ccm_send_id_ack(link->ofd->fd); if (ret <= 0) { LOGP(DLINP, LOGL_ERROR, "cannot send ID_ACK message. Reason: %s\n", strerror(errno)); goto err; } } return 1; 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(link->line->ops->cfg.ipa.dev, 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; } 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) { LOGPITS(e1i_ts, 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) { LOGPITS(e1i_ts, 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) { LOGPITS(e1i_ts, 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 { bool line_already_initialized; struct ipa_client_conn *ipa_cli[NUM_E1_TS]; /* 0=OML, 1+N=TRX_N */ }; 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) { LOGPIL(line, DLINP, LOGL_ERROR, "ipaccess: OOM in line update\n"); return -ENOMEM; } il = line->driver_data; switch(line->ops->cfg.ipa.role) { case E1INP_LINE_R_BSC: { /* We only initialize this line once. */ if (il->line_already_initialized) return 0; struct ipa_server_link *oml_link, *rsl_link; const char *ipa = e1inp_ipa_get_bind_addr(); LOGPIL(line, 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) { LOGPIL(line, DLINP, LOGL_ERROR, "cannot create OML BSC link: %s\n", strerror(errno)); return -ENOMEM; } oml_link->dscp = g_e1inp_ipaccess_pars.oml.dscp; oml_link->priority = g_e1inp_ipaccess_pars.oml.priority; if (ipa_server_link_open(oml_link) < 0) { LOGPIL(line, 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) { LOGPIL(line, DLINP, LOGL_ERROR, "cannot create RSL BSC link: %s\n", strerror(errno)); return -ENOMEM; } rsl_link->dscp = g_e1inp_ipaccess_pars.rsl.dscp; rsl_link->priority = g_e1inp_ipaccess_pars.rsl.priority; if (ipa_server_link_open(rsl_link) < 0) { LOGPIL(line, 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; struct e1inp_ts *e1i_ts = e1inp_line_ipa_oml_ts(line); LOGPITS(e1i_ts, DLINP, LOGL_NOTICE, "enabling ipaccess BTS mode, " "OML connecting to %s:%u\n", line->ops->cfg.ipa.addr, IPA_TCP_PORT_OML); /* Drop previous line */ if (il->ipa_cli[0]) { ipa_client_conn_close(il->ipa_cli[0]); ipaccess_keepalive_fsm_cleanup(e1i_ts); ipa_client_conn_destroy(il->ipa_cli[0]); il->ipa_cli[0] = NULL; } link = ipa_client_conn_create2(tall_ipa_ctx, e1inp_line_ipa_oml_ts(line), E1INP_SIGN_OML, NULL, 0, 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) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "cannot create OML BTS link: %s\n", strerror(errno)); return -ENOMEM; } link->dscp = g_e1inp_ipaccess_pars.oml.dscp; link->priority = g_e1inp_ipaccess_pars.oml.priority; if (ipa_client_conn_open2(link, line->connect_timeout) < 0) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "cannot open OML BTS link: %s\n", strerror(errno)); ipa_client_conn_close(link); ipa_client_conn_destroy(link); return -EIO; } ipaccess_bts_keepalive_fsm_alloc(e1i_ts, link, "oml_bts_to_bsc"); il->ipa_cli[0] = link; ret = 0; break; } default: break; } il->line_already_initialized = true; 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; struct e1inp_ts *e1i_ts = e1inp_line_ipa_rsl_ts(line, trx_nr); struct ipaccess_line *il; int rc; if (E1INP_SIGN_RSL+trx_nr-1 >= NUM_E1_TS) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "cannot create RSL BTS link: " "trx_nr (%d) out of range\n", trx_nr); return -EINVAL; } /* Drop previous line */ if ((rc = e1inp_ipa_bts_rsl_close_n(line, trx_nr)) < 0) return rc; if (!line->driver_data) line->driver_data = talloc_zero(line, struct ipaccess_line); il = line->driver_data; rsl_link = ipa_client_conn_create2(tall_ipa_ctx, e1inp_line_ipa_rsl_ts(line, trx_nr), E1INP_SIGN_RSL+trx_nr, NULL, 0, rem_addr, rem_port, ipaccess_bts_updown_cb, ipaccess_bts_read_cb, ipaccess_bts_write_cb, line); if (rsl_link == NULL) { LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "cannot create RSL BTS link: %s\n", strerror(errno)); return -ENOMEM; } rsl_link->dscp = g_e1inp_ipaccess_pars.rsl.dscp; rsl_link->priority = g_e1inp_ipaccess_pars.rsl.priority; if (ipa_client_conn_open2(rsl_link, line->connect_timeout) < 0) { LOGPITS(e1i_ts, 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; } ipaccess_bts_keepalive_fsm_alloc(e1i_ts, rsl_link, "rsl_bts_to_bsc"); il->ipa_cli[1 + trx_nr] = rsl_link; return 0; } /* Close the underlying IPA TCP socket of an RSL link */ int e1inp_ipa_bts_rsl_close_n(struct e1inp_line *line, uint8_t trx_nr) { struct ipa_client_conn *conn; struct ipaccess_line *il; struct e1inp_ts *e1i_ts; if (E1INP_SIGN_RSL+trx_nr-1 >= NUM_E1_TS) { LOGPIL(line, DLINP, LOGL_ERROR, "cannot close RSL BTS link: trx_nr (%d) out of range\n", trx_nr); return -EINVAL; } il = line->driver_data; if (!il) return 0; /* Nothing to do, no lines created */ e1i_ts = e1inp_line_ipa_rsl_ts(line, trx_nr); ipaccess_keepalive_fsm_cleanup(e1i_ts); conn = il->ipa_cli[1 + trx_nr]; if (conn != NULL) { ipa_client_conn_close(conn); ipa_client_conn_destroy(conn); il->ipa_cli[1 + trx_nr] = NULL; } 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"; }