Merge branch 'rtp_proxy'
diff --git a/openbsc/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am
index 86f056d..adef573 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -2,4 +2,4 @@
gsm_subscriber.h linuxlist.h msgb.h select.h tlv.h gsm_04_11.h \
timer.h misdn.h chan_alloc.h telnet_interface.h paging.h \
subchan_demux.h trau_frame.h e1_input.h trau_mux.h signal.h \
- gsm_utils.h ipaccess.h rs232.h openbscdefines.h
+ gsm_utils.h ipaccess.h rs232.h openbscdefines.h rtp_proxy.h
diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index 5eac8a7..e6dffa8 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -98,6 +98,7 @@
struct gsm_lchan;
struct gsm_subscriber;
struct gsm_mncc;
+struct rtp_socket;
/* One transaction */
struct gsm_trans {
@@ -214,6 +215,7 @@
u_int16_t bound_port;
u_int8_t rtp_payload2;
u_int16_t conn_id;
+ struct rtp_socket *rtp_socket;
} abis_ip;
struct gsm_lchan lchan[TS_MAX_LCHAN];
diff --git a/openbsc/include/openbsc/rtp_proxy.h b/openbsc/include/openbsc/rtp_proxy.h
new file mode 100644
index 0000000..e9fc157
--- /dev/null
+++ b/openbsc/include/openbsc/rtp_proxy.h
@@ -0,0 +1,70 @@
+#ifndef _RTP_PROXY_H
+#define _RTP_PROXY_H
+
+/* RTP proxy handling for ip.access nanoBTS */
+
+/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+
+#include <netinet/in.h>
+
+#include <openbsc/linuxlist.h>
+#include <openbsc/select.h>
+
+enum rtp_rx_action {
+ RTP_NONE,
+ RTP_PROXY,
+ RTP_RECV_UPSTREAM,
+};
+
+struct rtp_sub_socket {
+ struct sockaddr_in sin_local;
+ struct sockaddr_in sin_remote;
+
+ struct bsc_fd bfd;
+ /* linked list of to-be-transmitted msgb's */
+ struct llist_head tx_queue;
+};
+
+struct rtp_socket {
+ struct llist_head list;
+
+ struct rtp_sub_socket rtp;
+ struct rtp_sub_socket rtcp;
+
+ /* what should we do on receive? */
+ enum rtp_rx_action rx_action;
+ union {
+ struct {
+ struct rtp_socket *other_sock;
+ } proxy;
+ struct {
+ void (*recv_cb)(struct msgb *msg);
+ } receive;
+ };
+};
+
+struct rtp_socket *rtp_socket_create(void);
+int rtp_socket_bind(struct rtp_socket *rs, u_int32_t ip);
+int rtp_socket_connect(struct rtp_socket *rs, u_int32_t ip, u_int16_t port);
+int rtp_socket_proxy(struct rtp_socket *this, struct rtp_socket *other);
+int rtp_socket_free(struct rtp_socket *rs);
+
+#endif /* _RTP_PROXY_H */
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index c6e9dae..ed63c8e 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -10,7 +10,7 @@
gsm_04_11.c telnet_interface.c subchan_demux.c \
trau_frame.c trau_mux.c paging.c e1_config.c e1_input.c tlv_parser.c \
input/misdn.c input/ipaccess.c signal.c gsm_utils.c talloc.c \
- transaction.c
+ transaction.c rtp_proxy.c
libvty_a_SOURCES = vty/buffer.c vty/command.c vty/vector.c vty/vty.c
diff --git a/openbsc/src/bsc_hack.c b/openbsc/src/bsc_hack.c
index 1bfb706..ee8bd1f 100644
--- a/openbsc/src/bsc_hack.c
+++ b/openbsc/src/bsc_hack.c
@@ -64,6 +64,7 @@
static enum gsm_bts_type BTS_TYPE = GSM_BTS_TYPE_BS11;
static enum gsm_band BAND = GSM_BAND_900;
static const char *database_name = "hlr.sqlite3";
+extern int ipacc_rtp_direct;
struct nano_bts_id {
struct llist_head entry;
@@ -1113,10 +1114,11 @@
{"bts-id", 1, 0, 'i'},
{"tsc", 1, 0, 'S'},
{"bsic", 1, 0, 'B'},
+ {"rtp-proxy", 0, 0, 'P'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, "hc:n:d:sar:p:f:t:C:RL:l:Tb:i:S:B:",
+ c = getopt_long(argc, argv, "hc:n:d:sar:p:f:t:C:RL:l:Tb:i:S:B:P",
long_options, &option_index);
if (c == -1)
break;
@@ -1187,6 +1189,9 @@
case 'B':
BSIC = atoi(optarg);
break;
+ case 'P':
+ ipacc_rtp_direct = 0;
+ break;
}
default:
/* ignore */
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index a9f2ebd..2d3a634 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -44,6 +44,7 @@
#include <openbsc/signal.h>
#include <openbsc/trau_frame.h>
#include <openbsc/trau_mux.h>
+#include <openbsc/rtp_proxy.h>
#include <openbsc/talloc.h>
#include <openbsc/transaction.h>
@@ -56,6 +57,10 @@
static void *tall_locop_ctx;
+/* should ip.access BTS use direct RTP streams between each other (1),
+ * or should OpenBSC always act as RTP relay/proxy in between (0) ? */
+int ipacc_rtp_direct = 1;
+
static const struct tlv_definition rsl_att_tlvdef = {
.def = {
[GSM48_IE_MOBILE_ID] = { TLV_TYPE_TLV },
@@ -399,17 +404,6 @@
return 0;
}
-/*
- * This will be ran by the linker when loading the DSO. We use it to
- * do system initialization, e.g. registration of signal handlers.
- */
-static __attribute__((constructor)) void on_dso_load_0408(void)
-{
- tall_locop_ctx = talloc_named_const(tall_bsc_ctx, 1,
- "loc_updating_oper");
- register_signal_handler(SS_LCHAN, gsm0408_handle_lchan_signal, NULL);
-}
-
static void to_bcd(u_int8_t *bcd, u_int16_t val)
{
bcd[2] = val % 10;
@@ -1973,12 +1967,80 @@
return 0;
}
+/* some other part of the code sends us a signal */
+static int handle_abisip_signal(unsigned int subsys, unsigned int signal,
+ void *handler_data, void *signal_data)
+{
+ struct gsm_lchan *lchan = signal_data;
+ struct gsm_bts_trx_ts *ts;
+ int rc;
+
+ if (subsys != SS_ABISIP)
+ return 0;
+
+ /* in case we use direct BTS-to-BTS RTP */
+ if (ipacc_rtp_direct)
+ return 0;
+
+ ts = lchan->ts;
+
+ switch (signal) {
+ case S_ABISIP_BIND_ACK:
+ /* the BTS has successfully bound a TCH to a local ip/port,
+ * which means we can connect our UDP socket to it */
+ if (ts->abis_ip.rtp_socket) {
+ rtp_socket_free(ts->abis_ip.rtp_socket);
+ ts->abis_ip.rtp_socket = NULL;
+ }
+
+ ts->abis_ip.rtp_socket = rtp_socket_create();
+ if (!ts->abis_ip.rtp_socket)
+ goto out_err;
+
+ rc = rtp_socket_connect(ts->abis_ip.rtp_socket,
+ ts->abis_ip.bound_ip,
+ ts->abis_ip.bound_port);
+ if (rc < 0)
+ goto out_err;
+ break;
+ case S_ABISIP_DISC_IND:
+ /* the BTS tells us a RTP stream has been disconnected */
+ if (ts->abis_ip.rtp_socket) {
+ rtp_socket_free(ts->abis_ip.rtp_socket);
+ ts->abis_ip.rtp_socket = NULL;
+ }
+ break;
+ }
+
+ return 0;
+out_err:
+ /* FIXME: do something */
+ return 0;
+}
+
+/* bind rtp proxy to local IP/port and tell BTS to connect to it */
+static int ipacc_connect_proxy_bind(struct gsm_lchan *lchan)
+{
+ struct gsm_bts_trx_ts *ts = lchan->ts;
+ struct rtp_socket *rs = ts->abis_ip.rtp_socket;
+ int rc;
+
+ rc = rsl_ipacc_connect(lchan, ntohl(rs->rtp.sin_local.sin_addr.s_addr),
+ ntohs(rs->rtp.sin_local.sin_port),
+ ts->abis_ip.conn_id,
+ /* FIXME: use RTP payload of bound socket, not BTS*/
+ ts->abis_ip.rtp_payload2);
+
+ return rc;
+}
+
/* map two ipaccess RTP streams onto each other */
static int tch_map(struct gsm_lchan *lchan, struct gsm_lchan *remote_lchan)
{
struct gsm_bts *bts = lchan->ts->trx->bts;
struct gsm_bts *remote_bts = remote_lchan->ts->trx->bts;
struct gsm_bts_trx_ts *ts;
+ int rc;
DEBUGP(DCC, "Setting up TCH map between (bts=%u,trx=%u,ts=%u) and (bts=%u,trx=%u,ts=%u)\n",
bts->nr, lchan->ts->trx->nr, lchan->ts->nr,
@@ -1992,23 +2054,38 @@
switch (bts->type) {
case GSM_BTS_TYPE_NANOBTS_900:
case GSM_BTS_TYPE_NANOBTS_1800:
- ts = remote_lchan->ts;
- rsl_ipacc_connect(lchan, ts->abis_ip.bound_ip,
- ts->abis_ip.bound_port,
- lchan->ts->abis_ip.conn_id,
- ts->abis_ip.rtp_payload2);
-
- ts = lchan->ts;
- rsl_ipacc_connect(remote_lchan, ts->abis_ip.bound_ip,
- ts->abis_ip.bound_port,
- remote_lchan->ts->abis_ip.conn_id,
- ts->abis_ip.rtp_payload2);
+ if (!ipacc_rtp_direct) {
+ /* connect the TCH's to our RTP proxy */
+ rc = ipacc_connect_proxy_bind(lchan);
+ if (rc < 0)
+ return rc;
+ rc = ipacc_connect_proxy_bind(remote_lchan);
+
+ /* connect them with each other */
+ rtp_socket_proxy(lchan->ts->abis_ip.rtp_socket,
+ remote_lchan->ts->abis_ip.rtp_socket);
+ } else {
+ /* directly connect TCH RTP streams to each other */
+ ts = remote_lchan->ts;
+ rc = rsl_ipacc_connect(lchan, ts->abis_ip.bound_ip,
+ ts->abis_ip.bound_port,
+ lchan->ts->abis_ip.conn_id,
+ ts->abis_ip.rtp_payload2);
+ if (rc < 0)
+ return rc;
+ ts = lchan->ts;
+ rc = rsl_ipacc_connect(remote_lchan, ts->abis_ip.bound_ip,
+ ts->abis_ip.bound_port,
+ remote_lchan->ts->abis_ip.conn_id,
+ ts->abis_ip.rtp_payload2);
+ }
break;
case GSM_BTS_TYPE_BS11:
trau_mux_map_lchan(lchan, remote_lchan);
break;
default:
DEBUGP(DCC, "Unknown BTS type %u\n", bts->type);
+ rc = -EINVAL;
break;
}
@@ -3732,3 +3809,14 @@
return work;
}
+/*
+ * This will be ran by the linker when loading the DSO. We use it to
+ * do system initialization, e.g. registration of signal handlers.
+ */
+static __attribute__((constructor)) void on_dso_load_0408(void)
+{
+ tall_locop_ctx = talloc_named_const(tall_bsc_ctx, 1,
+ "loc_updating_oper");
+ register_signal_handler(SS_LCHAN, gsm0408_handle_lchan_signal, NULL);
+ register_signal_handler(SS_ABISIP, handle_abisip_signal, NULL);
+}
diff --git a/openbsc/src/rtp_proxy.c b/openbsc/src/rtp_proxy.c
new file mode 100644
index 0000000..61fc385
--- /dev/null
+++ b/openbsc/src/rtp_proxy.c
@@ -0,0 +1,446 @@
+/* RTP proxy handling for ip.access nanoBTS */
+
+/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <openbsc/talloc.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/msgb.h>
+#include <openbsc/select.h>
+#include <openbsc/debug.h>
+#include <openbsc/rtp_proxy.h>
+
+static LLIST_HEAD(rtp_sockets);
+
+/* should we mangle the CNAME inside SDES of RTCP packets? We disable
+ * this by default, as it seems to be not needed */
+static int mangle_rtcp_cname = 0;
+
+enum rtp_bfd_priv {
+ RTP_PRIV_NONE,
+ RTP_PRIV_RTP,
+ RTP_PRIV_RTCP
+};
+
+#define RTP_ALLOC_SIZE 1500
+
+/* according to RFC 1889 */
+struct rtcp_hdr {
+ u_int8_t byte0;
+ u_int8_t type;
+ u_int16_t length;
+} __attribute__((packed));
+
+#define RTCP_TYPE_SDES 202
+
+#define RTCP_IE_CNAME 1
+
+/* iterate over all chunks in one RTCP message, kook for CNAME IEs and
+ * replace all of those with 'new_cname' */
+static int rtcp_sdes_cname_mangle(struct msgb *msg, struct rtcp_hdr *rh,
+ u_int16_t *rtcp_len, const char *new_cname)
+{
+ u_int8_t *rtcp_end;
+ u_int8_t *cur = (u_int8_t *) rh;
+ u_int8_t tag, len = 0;
+
+ rtcp_end = cur + *rtcp_len;
+ /* move cur to end of RTP header */
+ cur += sizeof(rh);
+
+ /* iterate over Chunks */
+ while (cur+4 < rtcp_end) {
+ /* skip four bytes SSRC/CSRC */
+ cur += 4;
+
+ /* iterate over IE's inside the chunk */
+ while (cur+1 < rtcp_end) {
+ tag = *cur++;
+ if (tag == 0) {
+ /* end of chunk, skip additional zero */
+ while (*cur++ == 0) { }
+ break;
+ }
+ len = *cur++;
+
+ if (tag == RTCP_IE_CNAME) {
+ /* we've found the CNAME, lets mangle it */
+ if (len < strlen(new_cname)) {
+ /* we need to make more space */
+ int increase = strlen(new_cname) - len;
+
+ msgb_push(msg, increase);
+ memmove(cur+len+increase, cur+len,
+ rtcp_end - (cur+len));
+ /* FIXME: we have to respect RTCP
+ * padding/alignment rules! */
+ len += increase;
+ *(cur-1) += increase;
+ rtcp_end += increase;
+ *rtcp_len += increase;
+ }
+ /* copy new CNAME into message */
+ memcpy(cur, new_cname, strlen(new_cname));
+ /* FIXME: zero the padding in case new CNAME
+ * is smaller than old one !!! */
+ }
+ cur += len;
+ }
+ }
+
+ return 0;
+}
+
+static int rtcp_mangle(struct msgb *msg, struct rtp_socket *rs)
+{
+ struct rtp_sub_socket *rss = &rs->rtcp;
+ struct rtcp_hdr *rtph;
+ u_int16_t old_len;
+ int rc;
+
+ if (!mangle_rtcp_cname)
+ return 0;
+
+ /* iterate over list of RTCP messages */
+ rtph = (struct rtcp_hdr *)msg->data;
+ while ((void *)rtph + sizeof(*rtph) < (void *)msg->data + msg->len) {
+ old_len = (ntohs(rtph->length) + 1) * 4;
+ if (rtph->type == RTCP_TYPE_SDES) {
+ char new_cname[255];
+ strncpy(new_cname, inet_ntoa(rss->sin_local.sin_addr),
+ sizeof(new_cname));
+ new_cname[sizeof(new_cname)-1] = '\0';
+ rc = rtcp_sdes_cname_mangle(msg, rtph, &old_len,
+ new_cname);
+ if (rc < 0)
+ return rc;
+ }
+ rtph = (void *)rtph + old_len;
+ }
+
+ return 0;
+}
+
+/* read from incoming RTP/RTCP socket */
+static int rtp_socket_read(struct rtp_socket *rs, struct rtp_sub_socket *rss)
+{
+ int rc;
+ struct msgb *msg = msgb_alloc(RTP_ALLOC_SIZE, "RTP/RTCP");
+ struct rtp_sub_socket *other_rss;
+
+ if (!msg)
+ return -ENOMEM;
+
+ rc = read(rss->bfd.fd, msg->data, RTP_ALLOC_SIZE);
+ if (rc <= 0) {
+ rss->bfd.when &= ~BSC_FD_READ;
+ return rc;
+ }
+
+ msgb_put(msg, rc);
+
+ switch (rs->rx_action) {
+ case RTP_PROXY:
+ if (!rs->proxy.other_sock) {
+ rc = -EIO;
+ goto out_free;
+ }
+ if (rss->bfd.priv_nr == RTP_PRIV_RTP)
+ other_rss = &rs->proxy.other_sock->rtp;
+ else if (rss->bfd.priv_nr == RTP_PRIV_RTCP) {
+ other_rss = &rs->proxy.other_sock->rtcp;
+ /* modify RTCP SDES CNAME */
+ rc = rtcp_mangle(msg, rs);
+ if (rc < 0)
+ goto out_free;
+ } else {
+ rc = -EINVAL;
+ goto out_free;
+ }
+ msgb_enqueue(&other_rss->tx_queue, msg);
+ other_rss->bfd.when |= BSC_FD_WRITE;
+ break;
+ /* FIXME: other cases */
+ }
+
+ return rc;
+
+out_free:
+ msgb_free(msg);
+ return rc;
+}
+
+/* write from tx_queue to RTP/RTCP socket */
+static int rtp_socket_write(struct rtp_socket *rs, struct rtp_sub_socket *rss)
+{
+ struct msgb *msg;
+ int written;
+
+ msg = msgb_dequeue(&rss->tx_queue);
+ if (!msg) {
+ rss->bfd.when &= ~BSC_FD_WRITE;
+ return 0;
+ }
+
+ written = write(rss->bfd.fd, msg->data, msg->len);
+ if (written < msg->len) {
+ perror("short write");
+ msgb_free(msg);
+ return -EIO;
+ }
+
+ msgb_free(msg);
+
+ return 0;
+}
+
+
+/* callback for the select.c:bfd_* layer */
+static int rtp_bfd_cb(struct bsc_fd *bfd, unsigned int flags)
+{
+ struct rtp_socket *rs = bfd->data;
+ struct rtp_sub_socket *rss;
+
+ switch (bfd->priv_nr) {
+ case RTP_PRIV_RTP:
+ rss = &rs->rtp;
+ break;
+ case RTP_PRIV_RTCP:
+ rss = &rs->rtcp;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (flags & BSC_FD_READ)
+ rtp_socket_read(rs, rss);
+
+ if (flags & BSC_FD_WRITE)
+ rtp_socket_write(rs, rss);
+
+ return 0;
+}
+
+static void init_rss(struct rtp_sub_socket *rss,
+ struct rtp_socket *rs, int fd, int priv_nr)
+{
+ /* initialize bfd */
+ rss->bfd.fd = fd;
+ rss->bfd.data = rs;
+ rss->bfd.priv_nr = priv_nr;
+ rss->bfd.cb = rtp_bfd_cb;
+}
+
+struct rtp_socket *rtp_socket_create(void)
+{
+ int rc;
+ struct rtp_socket *rs;
+
+ DEBUGP(DMUX, "rtp_socket_create(): ");
+
+ rs = talloc_zero(tall_bsc_ctx, struct rtp_socket);
+ if (!rs)
+ return NULL;
+
+ INIT_LLIST_HEAD(&rs->rtp.tx_queue);
+ INIT_LLIST_HEAD(&rs->rtcp.tx_queue);
+
+ rc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (rc < 0)
+ goto out_free;
+
+ init_rss(&rs->rtp, rs, rc, RTP_PRIV_RTP);
+ rc = bsc_register_fd(&rs->rtp.bfd);
+ if (rc < 0)
+ goto out_rtp_socket;
+
+ rc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (rc < 0)
+ goto out_rtp_bfd;
+
+ init_rss(&rs->rtcp, rs, rc, RTP_PRIV_RTCP);
+ rc = bsc_register_fd(&rs->rtcp.bfd);
+ if (rc < 0)
+ goto out_rtcp_socket;
+
+ DEBUGPC(DMUX, "success\n");
+
+ rc = rtp_socket_bind(rs, INADDR_ANY);
+ if (rc < 0)
+ goto out_rtcp_bfd;
+
+ return rs;
+
+out_rtcp_bfd:
+ bsc_unregister_fd(&rs->rtcp.bfd);
+out_rtcp_socket:
+ close(rs->rtcp.bfd.fd);
+out_rtp_bfd:
+ bsc_unregister_fd(&rs->rtp.bfd);
+out_rtp_socket:
+ close(rs->rtp.bfd.fd);
+out_free:
+ talloc_free(rs);
+ DEBUGPC(DMUX, "failed\n");
+ return NULL;
+}
+
+static int rtp_sub_socket_bind(struct rtp_sub_socket *rss, u_int32_t ip,
+ u_int16_t port)
+{
+ int rc;
+ socklen_t alen = sizeof(rss->sin_local);
+
+ rss->sin_local.sin_family = AF_INET;
+ rss->sin_local.sin_addr.s_addr = htonl(ip);
+ rss->sin_local.sin_port = htons(port);
+ rss->bfd.when |= BSC_FD_READ;
+
+ rc = bind(rss->bfd.fd, (struct sockaddr *)&rss->sin_local,
+ sizeof(rss->sin_local));
+ if (rc < 0)
+ return rc;
+
+ /* retrieve the address we actually bound to, in case we
+ * passed INADDR_ANY as IP address */
+ return getsockname(rss->bfd.fd, (struct sockaddr *)&rss->sin_local,
+ &alen);
+}
+
+#define RTP_PORT_BASE 30000
+static unsigned int next_udp_port = RTP_PORT_BASE;
+
+/* bind a RTP socket to a local address */
+int rtp_socket_bind(struct rtp_socket *rs, u_int32_t ip)
+{
+ int rc = -EIO;
+ struct in_addr ia;
+
+ ia.s_addr = htonl(ip);
+ DEBUGP(DMUX, "rtp_socket_bind(rs=%p, IP=%s): ", rs,
+ inet_ntoa(ia));
+
+ /* try to bind to a consecutive pair of ports */
+ for (next_udp_port = next_udp_port % 0xffff;
+ next_udp_port < 0xffff; next_udp_port += 2) {
+ rc = rtp_sub_socket_bind(&rs->rtp, ip, next_udp_port);
+ if (rc != 0)
+ continue;
+
+ rc = rtp_sub_socket_bind(&rs->rtcp, ip, next_udp_port+1);
+ if (rc == 0)
+ break;
+ }
+ if (rc < 0) {
+ DEBUGPC(DMUX, "failed\n");
+ return rc;
+ }
+
+ ia.s_addr = rs->rtp.sin_local.sin_addr.s_addr;
+ DEBUGPC(DMUX, "BOUND_IP=%s, BOUND_PORT=%u\n",
+ inet_ntoa(ia), ntohs(rs->rtp.sin_local.sin_port));
+ return ntohs(rs->rtp.sin_local.sin_port);
+}
+
+static int rtp_sub_socket_connect(struct rtp_sub_socket *rss,
+ u_int32_t ip, u_int16_t port)
+{
+ int rc;
+ socklen_t alen = sizeof(rss->sin_local);
+
+ rss->sin_remote.sin_family = AF_INET;
+ rss->sin_remote.sin_addr.s_addr = htonl(ip);
+ rss->sin_remote.sin_port = htons(port);
+
+ rc = connect(rss->bfd.fd, (struct sockaddr *) &rss->sin_remote,
+ sizeof(rss->sin_remote));
+ if (rc < 0)
+ return rc;
+
+ return getsockname(rss->bfd.fd, (struct sockaddr *)&rss->sin_local,
+ &alen);
+}
+
+/* 'connect' a RTP socket to a remote peer */
+int rtp_socket_connect(struct rtp_socket *rs, u_int32_t ip, u_int16_t port)
+{
+ int rc;
+ struct in_addr ia;
+
+ ia.s_addr = htonl(ip);
+ DEBUGP(DMUX, "rtp_socket_connect(rs=%p, ip=%s, port=%u)\n",
+ rs, inet_ntoa(ia), port);
+
+ rc = rtp_sub_socket_connect(&rs->rtp, ip, port);
+ if (rc < 0)
+ return rc;
+
+ return rtp_sub_socket_connect(&rs->rtcp, ip, port+1);
+}
+
+/* bind two RTP/RTCP sockets together */
+int rtp_socket_proxy(struct rtp_socket *this, struct rtp_socket *other)
+{
+ DEBUGP(DMUX, "rtp_socket_proxy(this=%p, other=%p)\n",
+ this, other);
+
+ this->rx_action = RTP_PROXY;
+ this->proxy.other_sock = other;
+
+ other->rx_action = RTP_PROXY;
+ other->proxy.other_sock = this;
+
+ return 0;
+}
+
+static void free_tx_queue(struct rtp_sub_socket *rss)
+{
+ struct msgb *msg;
+
+ while ((msg = msgb_dequeue(&rss->tx_queue)))
+ msgb_free(msg);
+}
+
+int rtp_socket_free(struct rtp_socket *rs)
+{
+ DEBUGP(DMUX, "rtp_socket_free(rs=%p)\n", rs);
+
+ /* make sure we don't leave references dangling to us */
+ if (rs->rx_action == RTP_PROXY &&
+ rs->proxy.other_sock)
+ rs->proxy.other_sock->proxy.other_sock = NULL;
+
+ bsc_unregister_fd(&rs->rtp.bfd);
+ close(rs->rtp.bfd.fd);
+ free_tx_queue(&rs->rtp);
+
+ bsc_unregister_fd(&rs->rtcp.bfd);
+ close(rs->rtcp.bfd.fd);
+ free_tx_queue(&rs->rtcp);
+
+ talloc_free(rs);
+
+ return 0;
+}