diff options
author | Harald Welte <laforge@gnumonks.org> | 2015-11-11 21:23:23 +0100 |
---|---|---|
committer | Harald Welte <laforge@gnumonks.org> | 2015-11-12 01:01:35 +0100 |
commit | d32cbbb13087eae2617920d4ea980f0e8869a89e (patch) | |
tree | 36f3b68fcc0f6c67fc525a8285cb6c88e479c75d /src/osmobts_sock.cpp | |
parent | 8df447dc77d69a044c6f277b369be671655590f0 (diff) |
rename sysmo_sock.cpp to osmobts_sock.cpp
This also renames the --enable-sysmbts option to --enable-osmobts
This socket interface was nevery sysmoBTS specific, but it is a generic
socket interface to any OsmoBTS supported layer1/hardware. So it was a
mis-nomer so far.
Diffstat (limited to 'src/osmobts_sock.cpp')
-rw-r--r-- | src/osmobts_sock.cpp | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/src/osmobts_sock.cpp b/src/osmobts_sock.cpp new file mode 100644 index 00000000..52c13c42 --- /dev/null +++ b/src/osmobts_sock.cpp @@ -0,0 +1,310 @@ +/* osmobts_sock.cpp + * + * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <assert.h> +#include <sys/socket.h> +#include <sys/un.h> +extern "C" { +#include <osmocom/core/talloc.h> +#include <osmocom/core/select.h> +#include <osmocom/core/msgb.h> +} + +#include <gprs_rlcmac.h> +#include <pcu_l1_if.h> +#include <gprs_debug.h> +#include <gprs_bssgp_pcu.h> +#include <pcuif_proto.h> +#include <bts.h> +#include <tbf.h> + +extern void *tall_pcu_ctx; + +extern "C" { +int l1if_close_pdch(void *obj); +} + +/* + * osmo-bts PCU socket functions + */ + +struct pcu_sock_state { + struct osmo_fd conn_bfd; /* fd for connection to lcr */ + struct osmo_timer_list timer; /* socket connect retry timer */ + struct llist_head upqueue; /* queue for sending messages */ +} *pcu_sock_state = NULL; + +static void pcu_sock_timeout(void *_priv); + +int pcu_sock_send(struct msgb *msg) +{ + struct pcu_sock_state *state = pcu_sock_state; + struct osmo_fd *conn_bfd; + + if (!state) { + LOGP(DL1IF, LOGL_NOTICE, "PCU socket not created, dropping " + "message\n"); + return -EINVAL; + } + conn_bfd = &state->conn_bfd; + if (conn_bfd->fd <= 0) { + LOGP(DL1IF, LOGL_NOTICE, "PCU socket not connected, dropping " + "message\n"); + return -EIO; + } + msgb_enqueue(&state->upqueue, msg); + conn_bfd->when |= BSC_FD_WRITE; + + return 0; +} + +static void pcu_sock_close(struct pcu_sock_state *state, int lost) +{ + struct osmo_fd *bfd = &state->conn_bfd; + struct gprs_rlcmac_bts *bts = bts_main_data(); + uint8_t trx, ts; + + LOGP(DL1IF, LOGL_NOTICE, "PCU socket has %s connection\n", + (lost) ? "LOST" : "closed"); + + close(bfd->fd); + bfd->fd = -1; + osmo_fd_unregister(bfd); + + /* flush the queue */ + while (!llist_empty(&state->upqueue)) { + struct msgb *msg = msgb_dequeue(&state->upqueue); + msgb_free(msg); + } + + /* disable all slots, kick all TBFs */ + for (trx = 0; trx < 8; trx++) { +#ifdef ENABLE_SYSMODSP + if (bts->trx[trx].fl1h) { + l1if_close_pdch(bts->trx[trx].fl1h); + bts->trx[trx].fl1h = NULL; + } +#endif + for (ts = 0; ts < 8; ts++) + bts->trx[trx].pdch[ts].disable(); +#warning "NOT ALL RESOURCES are freed in this case... inconsistent with the other code. Share the code with pcu_l1if.c for the reset." + gprs_rlcmac_tbf::free_all(&bts->trx[trx]); + } + + gprs_bssgp_destroy(); + exit(0); +} + +static int pcu_sock_read(struct osmo_fd *bfd) +{ + struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; + struct gsm_pcu_if *pcu_prim; + struct msgb *msg; + int rc; + + msg = msgb_alloc(sizeof(*pcu_prim), "pcu_sock_rx"); + if (!msg) + return -ENOMEM; + + pcu_prim = (struct gsm_pcu_if *) msg->tail; + + rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0); + if (rc == 0) + goto close; + + if (rc < 0) { + if (errno == EAGAIN) + return 0; + goto close; + } + + rc = pcu_rx(pcu_prim->msg_type, pcu_prim); + + /* as we always synchronously process the message in pcu_rx() and + * its callbacks, we can free the message here. */ + msgb_free(msg); + + return rc; + +close: + msgb_free(msg); + pcu_sock_close(state, 1); + return -1; +} + +static int pcu_sock_write(struct osmo_fd *bfd) +{ + struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; + int rc; + + while (!llist_empty(&state->upqueue)) { + struct msgb *msg, *msg2; + struct gsm_pcu_if *pcu_prim; + + /* peek at the beginning of the queue */ + msg = llist_entry(state->upqueue.next, struct msgb, list); + pcu_prim = (struct gsm_pcu_if *)msg->data; + + bfd->when &= ~BSC_FD_WRITE; + + /* bug hunter 8-): maybe someone forgot msgb_put(...) ? */ + if (!msgb_length(msg)) { + LOGP(DL1IF, LOGL_ERROR, "message type (%d) with ZERO " + "bytes!\n", pcu_prim->msg_type); + goto dontsend; + } + + /* try to send it over the socket */ + rc = write(bfd->fd, msgb_data(msg), msgb_length(msg)); + if (rc == 0) + goto close; + if (rc < 0) { + if (errno == EAGAIN) { + bfd->when |= BSC_FD_WRITE; + break; + } + goto close; + } + +dontsend: + /* _after_ we send it, we can deueue */ + msg2 = msgb_dequeue(&state->upqueue); + assert(msg == msg2); + msgb_free(msg); + } + return 0; + +close: + pcu_sock_close(state, 1); + + return -1; +} + +static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags) +{ + int rc = 0; + + if (flags & BSC_FD_READ) + rc = pcu_sock_read(bfd); + if (rc < 0) + return rc; + + if (flags & BSC_FD_WRITE) + rc = pcu_sock_write(bfd); + + return rc; +} + +int pcu_l1if_open(void) +{ + struct pcu_sock_state *state; + struct osmo_fd *bfd; + struct sockaddr_un local; + unsigned int namelen; + int rc; + + state = pcu_sock_state; + if (!state) { + state = talloc_zero(tall_pcu_ctx, struct pcu_sock_state); + if (!state) + return -ENOMEM; + INIT_LLIST_HEAD(&state->upqueue); + } + + bfd = &state->conn_bfd; + + bfd->fd = socket(AF_UNIX, SOCK_SEQPACKET, 0); + if (bfd->fd < 0) { + LOGP(DL1IF, LOGL_ERROR, "Failed to create PCU socket.\n"); + talloc_free(state); + return -1; + } + + local.sun_family = AF_UNIX; + strncpy(local.sun_path, "/tmp/pcu_bts", sizeof(local.sun_path)); + local.sun_path[sizeof(local.sun_path) - 1] = '\0'; + + /* we use the same magic that X11 uses in Xtranssock.c for + * calculating the proper length of the sockaddr */ +#if defined(BSD44SOCKETS) || defined(__UNIXWARE__) + local.sun_len = strlen(local.sun_path); +#endif +#if defined(BSD44SOCKETS) || defined(SUN_LEN) + namelen = SUN_LEN(&local); +#else + namelen = strlen(local.sun_path) + + offsetof(struct sockaddr_un, sun_path); +#endif + rc = connect(bfd->fd, (struct sockaddr *) &local, namelen); + if (rc != 0) { + LOGP(DL1IF, LOGL_ERROR, "Failed to connect to the osmo-bts" + "PCU socket, delaying... '%s'\n", local.sun_path); + pcu_sock_state = state; + close(bfd->fd); + bfd->fd = -1; + state->timer.cb = pcu_sock_timeout; + osmo_timer_schedule(&state->timer, 5, 0); + return 0; + } + + bfd->when = BSC_FD_READ; + bfd->cb = pcu_sock_cb; + bfd->data = state; + + rc = osmo_fd_register(bfd); + if (rc < 0) { + LOGP(DL1IF, LOGL_ERROR, "Could not register PCU fd: %d\n", rc); + close(bfd->fd); + talloc_free(state); + return rc; + } + + LOGP(DL1IF, LOGL_NOTICE, "osmo-bts PCU socket has been connected\n"); + + pcu_sock_state = state; + + return 0; +} + +void pcu_l1if_close(void) +{ + struct pcu_sock_state *state = pcu_sock_state; + struct osmo_fd *bfd; + + if (!state) + return; + + osmo_timer_del(&state->timer); + + bfd = &state->conn_bfd; + if (bfd->fd > 0) + pcu_sock_close(state, 0); + talloc_free(state); + pcu_sock_state = NULL; +} + +static void pcu_sock_timeout(void *_priv) +{ + pcu_l1if_open(); +} |