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-rw-r--r--src/sysmo_sock.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/src/sysmo_sock.c b/src/sysmo_sock.c
new file mode 100644
index 0000000..f3bd3a7
--- /dev/null
+++ b/src/sysmo_sock.c
@@ -0,0 +1,305 @@
+/* sysmo_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>
+#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>
+
+extern void *tall_pcu_ctx;
+
+/*
+ * SYSMO-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)
+{
+ struct osmo_fd *bfd = &state->conn_bfd;
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_tbf *tbf;
+ uint8_t trx, ts, tfi;
+
+ LOGP(DL1IF, LOGL_NOTICE, "PCU socket has LOST connection\n");
+
+ 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++) {
+ for (ts = 0; ts < 8; ts++) {
+ bts->trx[trx].pdch[ts].enable = 0;
+ for (tfi = 0; tfi < 32; tfi++) {
+ tbf = bts->trx[trx].pdch[ts].ul_tbf[tfi];
+ if (tbf)
+ tbf_free(tbf);
+ tbf = bts->trx[trx].pdch[ts].dl_tbf[tfi];
+ if (tbf)
+ tbf_free(tbf);
+ }
+ }
+ }
+
+ gprs_bssgp_destroy();
+
+ state->timer.cb = pcu_sock_timeout;
+ osmo_timer_schedule(&state->timer, 5, 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);
+ 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);
+
+ 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-SYSMO 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 the PCU-SYSMO "
+ "socket, delaying... '%s'\n", local.sun_path);
+ 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, "PCU-SYSMO 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;
+
+ if (osmo_timer_pending(&state->timer))
+ osmo_timer_del(&state->timer);
+
+ bfd = &state->conn_bfd;
+ if (bfd->fd > 0)
+ pcu_sock_close(state);
+ talloc_free(state);
+ pcu_sock_state = NULL;
+}
+
+static void pcu_sock_timeout(void *_priv)
+{
+ pcu_l1if_open();
+}