| /* OpenBSC Abis input driver for osmo-e1d */ |
| |
| /* (C) 2019 by Sylvain Munaut <tnt@246tNt.com> |
| * |
| * All Rights Reserved |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| */ |
| |
| #include "config.h" |
| #include "internal.h" |
| |
| #ifdef HAVE_E1D |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <string.h> |
| |
| #include <osmocom/core/bits.h> |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/fsm.h> |
| #include <osmocom/core/signal.h> |
| |
| #include <osmocom/vty/vty.h> |
| |
| #include <osmocom/abis/subchan_demux.h> |
| #include <osmocom/abis/e1_input.h> |
| #include <osmocom/abis/lapd.h> |
| |
| #include <osmocom/e1d/proto.h> |
| #include <osmocom/e1d/proto_clnt.h> |
| |
| |
| #define TS_SIGN_ALLOC_SIZE 300 |
| #define S(x) (1 << (x)) |
| |
| |
| struct osmo_e1dp_client *g_e1d; |
| struct osmo_fsm_inst *g_e1d_fsm_inst = NULL; |
| |
| static int invertbits = 1; |
| |
| /* pre-declaration */ |
| extern struct e1inp_driver e1d_driver; |
| static int e1d_want_write(struct e1inp_ts *e1i_ts); |
| static int e1d_fd_cb(struct osmo_fd *bfd, unsigned int what); |
| static int e1d_line_update(struct e1inp_line *line); |
| |
| /* flag array to remember which lines are handled by osmo-e1d */ |
| bool lines[256]; |
| |
| enum fsm_e1d_client_states { |
| ST_DISCONNECTED, |
| ST_CONNECTED, |
| }; |
| |
| enum fsm_e1d_client_evt { |
| EV_CONN_LOST, |
| EV_CONNECT, |
| }; |
| |
| static const struct value_string fsm_e1d_client_evt_names[] = { |
| OSMO_VALUE_STRING(EV_CONN_LOST), |
| OSMO_VALUE_STRING(EV_CONNECT), |
| { 0, NULL } |
| }; |
| |
| struct e1inp_line *e1inp_port_find(uint8_t port_nr) |
| { |
| struct e1inp_line *e1i_line; |
| |
| /* iterate over global list of e1 lines */ |
| llist_for_each_entry(e1i_line, &e1inp_line_list, list) { |
| if (e1i_line->port_nr == port_nr) |
| return e1i_line; |
| } |
| return NULL; |
| } |
| |
| static void e1d_client_event_cb(enum osmo_e1dp_msg_type event, uint8_t intf, uint8_t line, uint8_t ts, uint8_t *data, int len) |
| { |
| struct e1inp_line *e1_line; |
| struct input_signal_data isd; |
| int signal; |
| |
| memset(&isd, 0, sizeof(isd)); |
| |
| /* we use higher 4 bits for interface, lower 4 bits for line, |
| * resulting in max. 16 interfaces with 16 lines each */ |
| e1_line = e1inp_port_find((intf << 4) | line); |
| if (!e1_line) |
| return; |
| isd.line = e1_line; |
| |
| switch (event) { |
| case E1DP_EVT_LOS_ON: |
| signal = S_L_INP_LINE_LOS; |
| break; |
| case E1DP_EVT_LOS_OFF: |
| signal = S_L_INP_LINE_NOLOS; |
| break; |
| case E1DP_EVT_AIS_ON: |
| signal = S_L_INP_LINE_AIS; |
| break; |
| case E1DP_EVT_AIS_OFF: |
| signal = S_L_INP_LINE_NOAIS; |
| break; |
| case E1DP_EVT_RAI_ON: |
| signal = S_L_INP_LINE_RAI; |
| break; |
| case E1DP_EVT_RAI_OFF: |
| signal = S_L_INP_LINE_NORAI; |
| break; |
| case E1DP_EVT_LOF_ON: |
| signal = S_L_INP_LINE_LOF; |
| break; |
| case E1DP_EVT_LOF_OFF: |
| signal = S_L_INP_LINE_NOLOF; |
| break; |
| case E1DP_EVT_SABITS: |
| signal = S_L_INP_LINE_SA_BITS; |
| if (len < 1) |
| return; |
| isd.sa_bits = *data; |
| break; |
| default: |
| /* Ignore all other events. */ |
| return; |
| } |
| |
| osmo_signal_dispatch(SS_L_INPUT, signal, &isd); |
| } |
| |
| static int fsm_e1_client_timer_cb(struct osmo_fsm_inst *fi) |
| { |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONNECT, NULL); |
| return 0; |
| } |
| |
| static void fsm_e1d_client_disconnected_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| switch (event) { |
| case EV_CONNECT: |
| if (!g_e1d) { |
| g_e1d = osmo_e1dp_client_create(NULL, "/tmp/osmo-e1d.ctl"); |
| if (!g_e1d) { |
| LOGPFSML(fi, LOGL_ERROR, "Unable to (re)connect to osmo-e1d daemon, retrying...\n"); |
| osmo_fsm_inst_state_chg(g_e1d_fsm_inst, ST_DISCONNECTED, 1, 0); |
| return; |
| } |
| osmo_e1dp_client_event_register(g_e1d, e1d_client_event_cb); |
| } |
| |
| LOGPFSML(fi, LOGL_NOTICE, "Successfully (re)connected to osmo-e1d daemon!\n"); |
| osmo_fsm_inst_state_chg(g_e1d_fsm_inst, ST_CONNECTED, 0, 0); |
| break; |
| default: |
| OSMO_ASSERT(false); |
| break; |
| } |
| } |
| |
| static void terminate_line(struct e1inp_line *line) |
| { |
| int ts; |
| |
| /* There should be technically no way to get a non e1d line into our private memory */ |
| OSMO_ASSERT(line->driver == &e1d_driver); |
| |
| for (ts = 1; ts < line->num_ts; ts++) { |
| unsigned int idx = ts - 1; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| struct osmo_fd *bfd = &e1i_ts->driver.e1d.fd; |
| |
| /* Only affect file descriptors that are currently in use (do not reset file descriptor value since we |
| * will use this value to detect if the file descriptor was in use when the connection broke.) */ |
| if (bfd->fd >= 0) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Terminating osmo-e1d connection to timeslot: %d\n", ts); |
| osmo_fd_unregister(bfd); |
| close(bfd->fd); |
| bfd->fd = -1; |
| } |
| } |
| } |
| |
| static void fsm_e1d_client_connected_onenter_cb(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| { |
| unsigned int i; |
| struct e1inp_line *line; |
| int ret; |
| |
| /* Run a line update to re-establish lost connections */ |
| for (i = 0; i < ARRAY_SIZE(lines); i++) { |
| if (!lines[i]) |
| continue; |
| |
| line = e1inp_line_find(i); |
| if (!line) { |
| /* Apparantly we lost a line - this should not happen */ |
| lines[i] = false; |
| continue; |
| } |
| |
| ret = e1d_line_update(line); |
| if (ret < 0) |
| LOGPFSML(fi, LOGL_ERROR, "Line update failed after (re)connecting to osmo-e1d daemon!\n"); |
| } |
| } |
| |
| static void fsm_e1d_client_connected_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| unsigned int i; |
| struct e1inp_line *line; |
| |
| switch (event) { |
| case EV_CONN_LOST: |
| LOGPFSML(fi, LOGL_ERROR, "Lost connection to osmo-e1d daemon!\n"); |
| |
| /* Destroy e1d clinet */ |
| if (g_e1d) { |
| osmo_e1dp_client_destroy(g_e1d); |
| g_e1d = NULL; |
| } |
| |
| /* Terminate all lines at once */ |
| for (i = 0; i < ARRAY_SIZE(lines); i++) { |
| if (!lines[i]) |
| continue; |
| line = e1inp_line_find(i); |
| if (!line) { |
| /* Apparantly we lost a line - this should not happen */ |
| lines[i] = false; |
| continue; |
| } |
| terminate_line(line); |
| } |
| |
| osmo_fsm_inst_state_chg(fi, ST_DISCONNECTED, 1, 0); |
| break; |
| default: |
| OSMO_ASSERT(false); |
| break; |
| } |
| } |
| |
| static bool e1d_connected(void) |
| { |
| if (g_e1d_fsm_inst && g_e1d_fsm_inst->state == ST_CONNECTED) |
| return true; |
| |
| LOGPFSML(g_e1d_fsm_inst, LOGL_ERROR, "No connection to osmo-e1d daemon!\n"); |
| return false; |
| } |
| |
| static struct osmo_fsm_state fsm_e1d_client_states[] = { |
| |
| /* Initial CRCX state. This state is immediately entered and executed |
| * when the FSM is started. The rationale is that we first have to |
| * create a connectin before we can execute other operations on that |
| * connection. */ |
| [ST_DISCONNECTED] = { |
| .in_event_mask = S(EV_CONNECT), |
| .out_state_mask = S(ST_CONNECTED) | S(ST_DISCONNECTED), |
| .name = OSMO_STRINGIFY(ST_DISCONNECTED), |
| .action = fsm_e1d_client_disconnected_cb, |
| }, |
| |
| /* Wait for the response to a CRCX operation, check and process the |
| * results, change to ST_READY afterwards. */ |
| [ST_CONNECTED] = { |
| .in_event_mask = S(EV_CONN_LOST), |
| .out_state_mask = S(ST_DISCONNECTED), |
| .name = OSMO_STRINGIFY(ST_CONNECTED), |
| .action = fsm_e1d_client_connected_cb, |
| .onenter = fsm_e1d_client_connected_onenter_cb, |
| }, |
| |
| }; |
| |
| static struct osmo_fsm fsm_e1d_client = { |
| .name = "e1d_client", |
| .states = fsm_e1d_client_states, |
| .num_states = ARRAY_SIZE(fsm_e1d_client_states), |
| .log_subsys = DLINP, |
| .event_names = fsm_e1d_client_evt_names, |
| .timer_cb = fsm_e1_client_timer_cb, |
| }; |
| |
| static int handle_ts_sign_read(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct msgb *msg = msgb_alloc(TS_SIGN_ALLOC_SIZE, "E1D Signaling TS"); |
| int ret; |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| ret = read(bfd->fd, msg->data, TS_SIGN_ALLOC_SIZE - 16); |
| if (ret < 1) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "%s read error: %d %s\n", __func__, ret, |
| ret < 0 ? strerror(errno) : "bytes read"); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, line); |
| return ret; |
| } |
| |
| msgb_put(msg, ret); |
| |
| return e1inp_rx_ts_lapd(e1i_ts, msg); |
| } |
| |
| static void timeout_ts_sign_write(void *data) |
| { |
| struct e1inp_ts *e1i_ts = (struct e1inp_ts *)data; |
| |
| /* trigger write of ts1, due to tx delay timer */ |
| e1d_want_write(e1i_ts); |
| } |
| |
| static int handle_ts_sign_write(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct e1inp_sign_link *sign_link; |
| struct msgb *msg; |
| |
| osmo_fd_write_disable(bfd); |
| |
| /* 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; |
| } |
| |
| DEBUGP(DLMI, "TX: %s\n", osmo_hexdump(msg->data, msg->len)); |
| lapd_transmit(e1i_ts->lapd, sign_link->tei, |
| sign_link->sapi, msg); |
| |
| /* set tx delay timer for next event */ |
| osmo_timer_setup(&e1i_ts->sign.tx_timer, timeout_ts_sign_write, e1i_ts); |
| osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, 50000); |
| |
| return 0; |
| } |
| |
| #define D_TSX_ALLOC_SIZE (D_BCHAN_TX_GRAN) |
| |
| static int handle_ts_trau_write(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| uint8_t tx_buf[D_BCHAN_TX_GRAN]; |
| struct subch_mux *mx = &e1i_ts->trau.mux; |
| int ret; |
| |
| ret = subchan_mux_out(mx, tx_buf, D_BCHAN_TX_GRAN); |
| |
| if (ret != D_BCHAN_TX_GRAN) { |
| LOGPITS(e1i_ts, DLINP, LOGL_DEBUG, "Huh, got ret of %d\n", ret); |
| if (ret < 0) |
| return ret; |
| } |
| |
| LOGPITS(e1i_ts, DLMIB, LOGL_DEBUG, "BCHAN TX: %s\n", osmo_hexdump(tx_buf, D_BCHAN_TX_GRAN)); |
| |
| if (invertbits) |
| osmo_revbytebits_buf(tx_buf, ret); |
| |
| ret = write(bfd->fd, tx_buf, ret); |
| if (ret < D_BCHAN_TX_GRAN) { |
| LOGPITS(e1i_ts, DLINP, LOGL_DEBUG, "send returns %d instead of %d\n", |
| ret, D_BCHAN_TX_GRAN); |
| if (ret <= 0) |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, line); |
| } |
| |
| return ret; |
| } |
| |
| |
| static int handle_ts_trau_read(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct msgb *msg = msgb_alloc(D_TSX_ALLOC_SIZE, "E1D Rx TSx"); |
| int ret; |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| ret = read(bfd->fd, msg->data, D_TSX_ALLOC_SIZE); |
| if (ret < 0 || ret != D_TSX_ALLOC_SIZE) { |
| /* FIXME: The socket that we read from is of type SOCK_STREAM. This means that we might read less then |
| * D_TSX_ALLOC_SIZE even though the connection is still fine. Since data is continuously written (in |
| * chunks of D_TSX_ALLOC_SIZE) on the other side we should not get partial reads too often but it is |
| * still possible and when it happens, a reconnect cycle will be triggered. To fix this we should add a |
| * buffering mechainsm that buffers the incomplete read instead of dropping the connection. (changing |
| * the socket type to SOCK_SEQPACKET would be an alternative, but it would break backward compatibility |
| * of the interface.) */ |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "%s read error: %d %s\n", __func__, ret, |
| ret < 0 ? strerror(errno) : "bytes read"); |
| if (ret <= 0) |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, line); |
| return ret; |
| } |
| |
| if (invertbits) |
| osmo_revbytebits_buf(msg->data, ret); |
| |
| msgb_put(msg, ret); |
| |
| msg->l2h = msg->data; |
| LOGPITS(e1i_ts, DLMIB, LOGL_DEBUG, "BCHAN RX: %s\n", osmo_hexdump(msgb_l2(msg), ret)); |
| ret = e1inp_rx_ts(e1i_ts, msg, 0, 0); |
| /* physical layer indicates that data has been sent, |
| * we thus can send some more data */ |
| ret = handle_ts_trau_write(bfd); |
| |
| return ret; |
| } |
| |
| /* write to a raw channel TS */ |
| static int handle_ts_raw_write(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct msgb *msg; |
| int ret; |
| |
| /* get the next msg for this timeslot */ |
| msg = e1inp_tx_ts(e1i_ts, NULL); |
| if (!msg) { |
| osmo_fd_write_disable(bfd); |
| return 0; |
| } |
| |
| if (msg->len != D_BCHAN_TX_GRAN) { |
| /* This might lead to a transmit underrun, as we call tx |
| * from the rx path, as there's no select/poll on dahdi |
| * */ |
| LOGPITS(e1i_ts, DLINP, LOGL_NOTICE, "unexpected msg->len = %u, " |
| "expected %u\n", msg->len, D_BCHAN_TX_GRAN); |
| } |
| |
| LOGPITS(e1i_ts, DLMIB, LOGL_DEBUG, "RAW CHAN TX: %s\n", osmo_hexdump(msg->data, msg->len)); |
| |
| if (0/*invertbits*/) |
| osmo_revbytebits_buf(msg->data, msg->len); |
| |
| ret = write(bfd->fd, msg->data, msg->len); |
| if (ret < msg->len) { |
| /* FIXME: The socket that we write to is of type SOCK_STREAM. This means that it may happen that the |
| * syscall is not able to write the full data chunk at once. This is a rare event, but when it happens, |
| * a reconnect cycle is triggered, even though the connection is still fine. To fix this, we should |
| * buffer the remainder of the data to write it in the next cycle instead of dropping the connection. |
| * (changing the socket type to SOCK_SEQPACKET would be an alternative, but it would break backward |
| * compatibility of the interface.) */ |
| LOGPITS(e1i_ts, DLINP, LOGL_DEBUG, "send returns %d instead of %d\n", ret, msg->len); |
| if (ret <= 0) |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, line); |
| } |
| msgb_free(msg); |
| |
| return ret; |
| } |
| |
| static int handle_ts_raw_read(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct msgb *msg = msgb_alloc(D_TSX_ALLOC_SIZE, "E1D Raw TS"); |
| int ret; |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| ret = read(bfd->fd, msg->data, D_TSX_ALLOC_SIZE); |
| if (ret < 0 || ret != D_TSX_ALLOC_SIZE) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "%s read error: %d %s\n", __func__, ret, |
| ret < 0 ? strerror(errno) : "bytes read"); |
| msgb_free(msg); |
| if (ret <= 0) |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, line); |
| return ret; |
| } |
| |
| if (0/*invertbits*/) |
| osmo_revbytebits_buf(msg->data, ret); |
| |
| msgb_put(msg, ret); |
| |
| msg->l2h = msg->data; |
| LOGPITS(e1i_ts, DLMIB, LOGL_DEBUG, "RAW CHAN RX: %s\n", msgb_hexdump_l2(msg)); |
| ret = e1inp_rx_ts(e1i_ts, msg, 0, 0); |
| |
| return ret; |
| } |
| |
| /* write to a hdlc channel TS */ |
| static int handle_ts_hdlc_write(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct msgb *msg; |
| int ret; |
| |
| /* get the next msg for this timeslot */ |
| msg = e1inp_tx_ts(e1i_ts, NULL); |
| if (!msg) { |
| osmo_fd_write_disable(bfd); |
| return 0; |
| } |
| |
| LOGPITS(e1i_ts, DLMIB, LOGL_DEBUG, "HDLC CHAN TX: %s\n", osmo_hexdump(msg->data, msg->len)); |
| |
| ret = write(bfd->fd, msg->data, msg->len); |
| if (ret < msg->len) { |
| LOGPITS(e1i_ts, DLINP, LOGL_NOTICE, "send returns %d instead of %d\n", ret, msg->len); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, line); |
| } |
| msgb_free(msg); |
| |
| return ret; |
| } |
| |
| #define TSX_ALLOC_SIZE 4096 |
| |
| /* read from a hdlc channel TS */ |
| static int handle_ts_hdlc_read(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct msgb *msg = msgb_alloc(TSX_ALLOC_SIZE, "E1D HDLC TS"); |
| int ret; |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| ret = read(bfd->fd, msg->data, TSX_ALLOC_SIZE); |
| if (ret <= 0) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "%s read error: %d %s\n", __func__, ret, strerror(errno)); |
| msgb_free(msg); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, line); |
| return ret; |
| } |
| |
| msgb_put(msg, ret); |
| |
| msg->l2h = msg->data; |
| LOGPITS(e1i_ts, DLMIB, LOGL_DEBUG, "HDLC CHAN RX: %s\n", msgb_hexdump_l2(msg)); |
| ret = e1inp_rx_ts(e1i_ts, msg, 0, 0); |
| |
| return ret; |
| } |
| |
| static void e1d_write_msg(struct msgb *msg, void *cbdata) |
| { |
| struct osmo_fd *bfd = cbdata; |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| int ret; |
| |
| if (!e1d_connected()) { |
| msgb_free(msg); |
| return; |
| } |
| |
| ret = write(bfd->fd, msg->data, msg->len); |
| msgb_free(msg); |
| if (ret < 0) { |
| LOGPITS(e1i_ts, DLMI, LOGL_NOTICE, "%s write failed %d\n", __func__, ret); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, line); |
| } |
| } |
| |
| static int e1d_fd_cb(struct osmo_fd *bfd, unsigned int what) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| unsigned int idx = ts_nr-1; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| int ret = 0; |
| |
| if (!e1d_connected()) |
| return -EIO; |
| |
| switch (e1i_ts->type) { |
| case E1INP_TS_TYPE_SIGN: |
| if (what & OSMO_FD_READ) |
| ret = handle_ts_sign_read(bfd); |
| if (what & OSMO_FD_WRITE) |
| ret = handle_ts_sign_write(bfd); |
| break; |
| case E1INP_TS_TYPE_TRAU: |
| if (what & OSMO_FD_READ) |
| ret = handle_ts_trau_read(bfd); |
| /* handle_ts_trau_write() is called inside handle_ts_trau_read(). |
| * OSMO_FD_WRITE flag is not required here and will not be set. |
| */ |
| break; |
| case E1INP_TS_TYPE_RAW: |
| if (what & OSMO_FD_READ) |
| ret = handle_ts_raw_read(bfd); |
| if (what & OSMO_FD_WRITE) |
| ret = handle_ts_raw_write(bfd); |
| break; |
| case E1INP_TS_TYPE_HDLC: |
| if (what & OSMO_FD_READ) |
| ret = handle_ts_hdlc_read(bfd); |
| if (what & OSMO_FD_WRITE) |
| ret = handle_ts_hdlc_write(bfd); |
| break; |
| default: |
| LOGPITS(e1i_ts, DLINP, LOGL_NOTICE, "unknown/unsupported E1 TS type %u\n", e1i_ts->type); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| |
| static int e1d_want_write(struct e1inp_ts *e1i_ts) |
| { |
| if (!e1d_connected()) |
| return -EIO; |
| |
| /* We never include the DAHDI B-Channel FD into the writeset */ |
| if (e1i_ts->type == E1INP_TS_TYPE_TRAU || |
| e1i_ts->type == E1INP_TS_TYPE_I460) { |
| LOGPITS(e1i_ts, DLINP, LOGL_DEBUG, "Trying to write TRAU ts\n"); |
| return 0; |
| } |
| |
| osmo_fd_write_enable(&e1i_ts->driver.e1d.fd); |
| |
| return 0; |
| } |
| |
| static int e1d_line_update(struct e1inp_line *line) |
| { |
| int ts; |
| int ret; |
| |
| /* we use higher 4 bits for interface, lower 4 bits for line, |
| * resulting in max. 16 interfaces with 16 lines each */ |
| uint8_t e1d_intf = (line->port_nr >> 4) & 0xF; |
| uint8_t e1d_line = line->port_nr & 0xF; |
| struct osmo_e1dp_ts_info *ts_info; |
| int num_ts_info; |
| |
| if (line->driver != &e1d_driver) |
| return -EINVAL; |
| |
| /* Memorize that osmo-e1d is responsible for this line */ |
| lines[line->num] = true; |
| |
| /* Spawn FSM to handle connection towards osmo-e1d */ |
| if (!g_e1d_fsm_inst) { |
| g_e1d_fsm_inst = osmo_fsm_inst_alloc(&fsm_e1d_client, NULL, NULL, LOGL_DEBUG, "fsm_e1d_client"); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONNECT, NULL); |
| OSMO_ASSERT(g_e1d_fsm_inst); |
| } |
| |
| /* In case no connection to osmo-e1d is available, we may postpone the line update until the connection is |
| * available (again) */ |
| if (!e1d_connected()) { |
| LOGPIL(line, DLINP, LOGL_NOTICE, "No connection to osmo-e1d daemon, postponing Line update: %d %d=E1D(%d:%d) %d\n", line->num, line->port_nr, |
| e1d_intf, e1d_line, line->num_ts); |
| return 0; |
| } |
| LOGPIL(line, DLINP, LOGL_NOTICE, "Line update: %d %d=E1D(%d:%d) %d\n", line->num, line->port_nr, |
| e1d_intf, e1d_line, line->num_ts); |
| |
| ret = osmo_e1dp_client_ts_query(g_e1d, &ts_info, &num_ts_info, e1d_intf, e1d_line, E1DP_INVALID); |
| if (ret < 0) { |
| LOGPIL(line, DLINP, LOGL_ERROR, "Cannot query E1D for timeslot information: %d, postpoining line update\n", ret); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, NULL); |
| /* Since we have mechanisms in place that allow us to postpone the line update until the connection |
| * to osmo-e1d is up again, we may pretend that the line update went ok. */ |
| return 0; |
| } |
| |
| for (ts=1; ts<line->num_ts; ts++) |
| { |
| unsigned int idx = ts-1; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| struct osmo_fd *bfd = &e1i_ts->driver.e1d.fd; |
| |
| /* unregister FD if it was already registered/in use */ |
| if (osmo_fd_is_registered(bfd)) |
| osmo_fd_unregister(bfd); |
| |
| if (e1i_ts->type != E1INP_TS_TYPE_NONE && ts >= num_ts_info) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Timeslot configured, but not existent " |
| "on E1D side; skipping\n"); |
| continue; |
| } |
| |
| switch (e1i_ts->type) { |
| case E1INP_TS_TYPE_NONE: |
| /* close/release LAPD instance, if any */ |
| if (e1i_ts->lapd) { |
| lapd_instance_free(e1i_ts->lapd); |
| e1i_ts->lapd = NULL; |
| } |
| if (bfd->fd >= 0) { |
| close(bfd->fd); |
| bfd->fd = -1; |
| } |
| continue; |
| case E1INP_TS_TYPE_SIGN: |
| if (bfd->fd >= 0 && ts_info[ts].cfg.mode != E1DP_TSMODE_HDLCFCS) { |
| close(bfd->fd); |
| bfd->fd = -1; |
| } |
| if (bfd->fd < 0) { |
| bfd->fd = osmo_e1dp_client_ts_open(g_e1d, e1d_intf, e1d_line, ts, |
| E1DP_TSMODE_HDLCFCS, D_BCHAN_TX_GRAN); |
| } |
| if (bfd->fd < 0) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Could not open timeslot %d\n", ts); |
| talloc_free(ts_info); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, NULL); |
| return -EIO; |
| } |
| bfd->when = OSMO_FD_READ; |
| |
| if (!e1i_ts->lapd) { |
| char name[32]; |
| e1inp_ts_name(name, sizeof(name), e1i_ts); |
| e1i_ts->lapd = lapd_instance_alloc2(1, |
| e1d_write_msg, bfd, e1inp_dlsap_up, |
| e1i_ts, &lapd_profile_abis, name); |
| } |
| break; |
| case E1INP_TS_TYPE_HDLC: |
| /* close/release LAPD instance, if any */ |
| if (e1i_ts->lapd) { |
| lapd_instance_free(e1i_ts->lapd); |
| e1i_ts->lapd = NULL; |
| } |
| /* close, if old timeslot mode doesn't match new config */ |
| if (bfd->fd >= 0 && ts_info[ts].cfg.mode != E1DP_TSMODE_HDLCFCS) { |
| close(bfd->fd); |
| bfd->fd = -1; |
| } |
| if (bfd->fd < 0) { |
| bfd->fd = osmo_e1dp_client_ts_open(g_e1d, e1d_intf, e1d_line, ts, |
| E1DP_TSMODE_HDLCFCS, D_BCHAN_TX_GRAN); |
| } |
| if (bfd->fd < 0) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Could not open timeslot %d\n", ts); |
| talloc_free(ts_info); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, NULL); |
| return -EIO; |
| } |
| bfd->when = OSMO_FD_READ; |
| break; |
| case E1INP_TS_TYPE_TRAU: |
| case E1INP_TS_TYPE_I460: |
| case E1INP_TS_TYPE_RAW: |
| /* close/release LAPD instance, if any */ |
| if (e1i_ts->lapd) { |
| lapd_instance_free(e1i_ts->lapd); |
| e1i_ts->lapd = NULL; |
| } |
| /* close, if old timeslot mode doesn't match new config */ |
| if (bfd->fd >= 0 && ts_info[ts].cfg.mode != E1DP_TSMODE_RAW) { |
| close(bfd->fd); |
| bfd->fd = -1; |
| } |
| if (bfd->fd < 0) { |
| bfd->fd = osmo_e1dp_client_ts_open(g_e1d, e1d_intf, e1d_line, ts, |
| E1DP_TSMODE_RAW, D_BCHAN_TX_GRAN); |
| } |
| if (bfd->fd < 0) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "Could not open timeslot %d\n", ts); |
| talloc_free(ts_info); |
| osmo_fsm_inst_dispatch(g_e1d_fsm_inst, EV_CONN_LOST, NULL); |
| return -EIO; |
| } |
| bfd->when = OSMO_FD_READ; |
| break; |
| }; |
| |
| osmo_fd_setup(bfd, bfd->fd, bfd->when, e1d_fd_cb, line, ts); |
| ret = osmo_fd_register(bfd); |
| if (ret < 0) { |
| LOGPITS(e1i_ts, DLINP, LOGL_ERROR, "could not register FD: %s\n", strerror(ret)); |
| talloc_free(ts_info); |
| close(bfd->fd); |
| bfd->fd = -1; |
| return ret; |
| } |
| } |
| |
| talloc_free(ts_info); |
| return 0; |
| } |
| |
| static int e1d_line_create(struct e1inp_line *line) |
| { |
| int ts; |
| |
| for (ts = 1; ts < line->num_ts; ts++) { |
| unsigned int idx = ts - 1; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| struct osmo_fd *bfd = &e1i_ts->driver.e1d.fd; |
| |
| bfd->fd = -1; |
| } |
| |
| return 0; |
| } |
| |
| static int set_sa_bits(struct e1inp_line *line, uint8_t sa_bits) |
| { |
| /* we use higher 4 bits for interface, lower 4 bits for line, |
| * resulting in max. 16 interfaces with 16 lines each */ |
| uint8_t e1d_intf = (line->port_nr >> 4) & 0xF; |
| uint8_t e1d_line = line->port_nr & 0xF; |
| |
| return osmo_e1dp_client_set_sa_bits(g_e1d, e1d_intf, e1d_line, sa_bits); |
| } |
| |
| struct e1inp_driver e1d_driver = { |
| .name = "e1d", |
| .want_write = e1d_want_write, |
| .set_sa_bits = set_sa_bits, |
| .line_update = e1d_line_update, |
| .line_create = e1d_line_create, |
| }; |
| |
| int e1inp_e1d_init(void) |
| { |
| OSMO_ASSERT(osmo_fsm_register(&fsm_e1d_client) == 0); |
| memset(lines, 0, sizeof(lines)); |
| |
| /* register the driver with the core */ |
| return e1inp_driver_register(&e1d_driver); |
| } |
| |
| #endif /* HAVE_E1D */ |