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-rw-r--r--openbsc/src/gsm_04_08.c117
-rw-r--r--openbsc/src/rtp_proxy.c227
-rw-r--r--openbsc/src/trau_mux.c92
3 files changed, 388 insertions, 48 deletions
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index d59d7d7ca..f36723937 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -1864,12 +1864,16 @@ static int setup_trig_pag_evt(unsigned int hooknum, unsigned int event,
return 0;
}
+static int tch_recv_mncc(struct gsm_network *net, u_int32_t callref, int enable);
+
/* 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;
int rc;
+ struct gsm_network *net;
+ struct gsm_trans *trans;
if (subsys != SS_ABISIP)
return 0;
@@ -1896,6 +1900,15 @@ static int handle_abisip_signal(unsigned int subsys, unsigned int signal,
lchan->abis_ip.bound_port);
if (rc < 0)
goto out_err;
+ /* check if any transactions on this lchan still have
+ * a tch_recv_mncc request pending */
+ net = lchan->ts->trx->bts->network;
+ llist_for_each_entry(trans, &net->trans_list, entry) {
+ if (trans->lchan == lchan && trans->tch_recv) {
+ DEBUGP(DCC, "pending tch_recv_mncc request\n");
+ tch_recv_mncc(net, trans->callref, 1);
+ }
+ }
break;
case S_ABISIP_DLCX_IND:
/* the BTS tells us a RTP stream has been disconnected */
@@ -1941,7 +1954,8 @@ static int tch_map(struct gsm_lchan *lchan, struct gsm_lchan *remote_lchan)
DEBUGP(DCC, "Cannot switch calls between different BTS types yet\n");
return -EINVAL;
}
-
+
+ // todo: map between different bts types
switch (bts->type) {
case GSM_BTS_TYPE_NANOBTS:
if (!ipacc_rtp_direct) {
@@ -1950,6 +1964,7 @@ static int tch_map(struct gsm_lchan *lchan, struct gsm_lchan *remote_lchan)
if (rc < 0)
return rc;
rc = ipacc_connect_proxy_bind(remote_lchan);
+#warning do we need a check of rc here?
/* connect them with each other */
rtp_socket_proxy(lchan->abis_ip.rtp_socket,
@@ -1971,8 +1986,7 @@ static int tch_map(struct gsm_lchan *lchan, struct gsm_lchan *remote_lchan)
break;
default:
DEBUGP(DCC, "Unknown BTS type %u\n", bts->type);
- rc = -EINVAL;
- break;
+ return -EINVAL;
}
return 0;
@@ -1994,45 +2008,61 @@ static int tch_bridge(struct gsm_network *net, u_int32_t *refs)
return tch_map(trans1->lchan, trans2->lchan);
}
-/* enable receive of channels to upqueue */
-static int tch_recv(struct gsm_network *net, struct gsm_mncc *data, int enable)
+/* enable receive of channels to MNCC upqueue */
+static int tch_recv_mncc(struct gsm_network *net, u_int32_t callref, int enable)
{
struct gsm_trans *trans;
+ struct gsm_lchan *lchan;
+ struct gsm_bts *bts;
+ int rc;
/* Find callref */
- trans = trans_find_by_callref(net, data->callref);
+ trans = trans_find_by_callref(net, callref);
if (!trans)
return -EIO;
if (!trans->lchan)
return 0;
+ lchan = trans->lchan;
+ bts = lchan->ts->trx->bts;
- // todo IPACCESS
- if (enable)
- return trau_recv_lchan(trans->lchan, data->callref);
- return trau_mux_unmap(NULL, data->callref);
-}
-
-/* send a frame to channel */
-static int tch_frame(struct gsm_network *net, struct gsm_trau_frame *frame)
-{
- struct gsm_trans *trans;
-
- /* Find callref */
- trans = trans_find_by_callref(net, frame->callref);
- if (!trans)
- return -EIO;
- if (!trans->lchan)
- return 0;
- if (trans->lchan->type != GSM_LCHAN_TCH_F &&
- trans->lchan->type != GSM_LCHAN_TCH_H)
- return 0;
+ switch (bts->type) {
+ case GSM_BTS_TYPE_NANOBTS:
+ if (ipacc_rtp_direct) {
+ DEBUGP(DCC, "Error: RTP proxy is disabled\n");
+ return -EINVAL;
+ }
+ /* in case, we don't have a RTP socket yet, we note this
+ * in the transaction and try later */
+ if (!lchan->abis_ip.rtp_socket) {
+ trans->tch_recv = enable;
+ DEBUGP(DCC, "queue tch_recv_mncc request (%d)\n", enable);
+ return 0;
+ }
+ if (enable) {
+ /* connect the TCH's to our RTP proxy */
+ rc = ipacc_connect_proxy_bind(lchan);
+ if (rc < 0)
+ return rc;
+ /* assign socket to application interface */
+ rtp_socket_upstream(lchan->abis_ip.rtp_socket,
+ net, callref);
+ } else
+ rtp_socket_upstream(lchan->abis_ip.rtp_socket,
+ net, 0);
+ break;
+ case GSM_BTS_TYPE_BS11:
+ if (enable)
+ return trau_recv_lchan(lchan, callref);
+ return trau_mux_unmap(NULL, callref);
+ break;
+ default:
+ DEBUGP(DCC, "Unknown BTS type %u\n", bts->type);
+ return -EINVAL;
+ }
- // todo IPACCESS
- return trau_send_lchan(trans->lchan,
- (struct decoded_trau_frame *)frame->data);
+ return 0;
}
-
static int gsm48_cc_rx_status_enq(struct gsm_trans *trans, struct msgb *msg)
{
DEBUGP(DCC, "-> STATUS ENQ\n");
@@ -3262,11 +3292,30 @@ int mncc_send(struct gsm_network *net, int msg_type, void *arg)
case MNCC_BRIDGE:
return tch_bridge(net, arg);
case MNCC_FRAME_DROP:
- return tch_recv(net, arg, 0);
+ return tch_recv_mncc(net, data->callref, 0);
case MNCC_FRAME_RECV:
- return tch_recv(net, arg, 1);
- case GSM_TRAU_FRAME:
- return tch_frame(net, arg);
+ return tch_recv_mncc(net, data->callref, 1);
+ case GSM_TCHF_FRAME:
+ /* Find callref */
+ trans = trans_find_by_callref(net, data->callref);
+ if (!trans)
+ return -EIO;
+ if (!trans->lchan)
+ return 0;
+ if (trans->lchan->type != GSM_LCHAN_TCH_F)
+ return 0;
+ bts = trans->lchan->ts->trx->bts;
+ switch (bts->type) {
+ case GSM_BTS_TYPE_NANOBTS:
+ if (!trans->lchan->abis_ip.rtp_socket)
+ return 0;
+ return rtp_send_frame(trans->lchan->abis_ip.rtp_socket, arg);
+ case GSM_BTS_TYPE_BS11:
+ return trau_send_frame(trans->lchan, arg);
+ default:
+ DEBUGP(DCC, "Unknown BTS type %u\n", bts->type);
+ }
+ return -EINVAL;
}
memset(&rel, 0, sizeof(struct gsm_mncc));
diff --git a/openbsc/src/rtp_proxy.c b/openbsc/src/rtp_proxy.c
index bfd494856..f9207d661 100644
--- a/openbsc/src/rtp_proxy.c
+++ b/openbsc/src/rtp_proxy.c
@@ -24,6 +24,10 @@
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
+#include <sys/time.h> /* gettimeofday() */
+#include <unistd.h> /* get..() */
+#include <time.h> /* clock() */
+#include <sys/utsname.h> /* uname() */
#include <openbsc/talloc.h>
#include <openbsc/gsm_data.h>
@@ -57,6 +61,169 @@ struct rtcp_hdr {
#define RTCP_IE_CNAME 1
+/* according to RFC 3550 */
+struct rtp_hdr {
+ u_int8_t csrc_count:4,
+ extension:1,
+ padding:1,
+ version:2;
+ u_int8_t payload_type:7,
+ marker:1;
+ u_int16_t sequence;
+ u_int32_t timestamp;
+ u_int32_t ssrc;
+} __attribute__((packed));
+
+struct rtp_x_hdr {
+ u_int16_t by_profile;
+ u_int16_t length;
+} __attribute__((packed));
+
+#define RTP_VERSION 2
+
+#define RTP_PT_GSM_FULL 3
+
+/* decode an rtp frame and create a new buffer with payload */
+static int rtp_decode(struct msgb *msg, u_int32_t callref, struct msgb **data)
+{
+ struct msgb *new_msg;
+ struct gsm_data_frame *frame;
+ struct rtp_hdr *rtph = (struct rtp_hdr *)msg->data;
+ struct rtp_x_hdr *rtpxh;
+ u_int8_t *payload;
+ int payload_len;
+ int msg_type;
+ int x_len;
+
+ if (msg->len < 12) {
+ DEBUGPC(DMUX, "received RTP frame too short (len = %d)\n",
+ msg->len);
+ return -EINVAL;
+ }
+ if (rtph->version != RTP_VERSION) {
+ DEBUGPC(DMUX, "received RTP version %d not supported.\n",
+ rtph->version);
+ return -EINVAL;
+ }
+ payload = msg->data + sizeof(struct rtp_hdr) + (rtph->csrc_count << 2);
+ payload_len = msg->len - sizeof(struct rtp_hdr) - (rtph->csrc_count << 2);
+ if (payload_len < 0) {
+ DEBUGPC(DMUX, "received RTP frame too short (len = %d, "
+ "csrc count = %d)\n", msg->len, rtph->csrc_count);
+ return -EINVAL;
+ }
+ if (rtph->extension) {
+ if (payload_len < sizeof(struct rtp_x_hdr)) {
+ DEBUGPC(DMUX, "received RTP frame too short for "
+ "extension header\n");
+ return -EINVAL;
+ }
+ rtpxh = (struct rtp_x_hdr *)payload;
+ x_len = ntohs(rtpxh->length) * 4 + sizeof(struct rtp_x_hdr);
+ payload += x_len;
+ payload_len -= x_len;
+ if (payload_len < 0) {
+ DEBUGPC(DMUX, "received RTP frame too short, "
+ "extension header exceeds frame length\n");
+ return -EINVAL;
+ }
+ }
+ if (rtph->padding) {
+ if (payload_len < 0) {
+ DEBUGPC(DMUX, "received RTP frame too short for "
+ "padding length\n");
+ return -EINVAL;
+ }
+ payload_len -= payload[payload_len - 1];
+ if (payload_len < 0) {
+ DEBUGPC(DMUX, "received RTP frame with padding "
+ "greater than payload\n");
+ return -EINVAL;
+ }
+ }
+
+ switch (rtph->payload_type) {
+ case RTP_PT_GSM_FULL:
+ msg_type = GSM_TCHF_FRAME;
+ if (payload_len != 33) {
+ DEBUGPC(DMUX, "received RTP full rate frame with "
+ "payload length != 32 (len = %d)\n",
+ payload_len);
+ return -EINVAL;
+ }
+ break;
+ default:
+ DEBUGPC(DMUX, "received RTP frame with unknown payload "
+ "type %d\n", rtph->payload_type);
+ return -EINVAL;
+ }
+
+ new_msg = msgb_alloc(sizeof(struct gsm_data_frame) + payload_len,
+ "GSM-DATA");
+ if (!new_msg)
+ return -ENOMEM;
+ frame = (struct gsm_data_frame *)(new_msg->data);
+ frame->msg_type = msg_type;
+ frame->callref = callref;
+ memcpy(frame->data, payload, payload_len);
+ msgb_put(new_msg, sizeof(struct gsm_data_frame) + payload_len);
+
+ *data = new_msg;
+ return 0;
+}
+
+/* encode and send a rtp frame */
+int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame)
+{
+ struct rtp_sub_socket *rss = &rs->rtp;
+ struct msgb *msg;
+ struct rtp_hdr *rtph;
+ int payload_type;
+ int payload_len;
+ int duration; /* in samples */
+
+ if (rs->tx_action != RTP_SEND_DOWNSTREAM) {
+ /* initialize sequences */
+ rs->tx_action = RTP_SEND_DOWNSTREAM;
+ rs->transmit.ssrc = rand();
+ rs->transmit.sequence = random();
+ rs->transmit.timestamp = random();
+ }
+
+ switch (frame->msg_type) {
+ case GSM_TCHF_FRAME:
+ payload_type = RTP_PT_GSM_FULL;
+ payload_len = 33;
+ duration = 160;
+ break;
+ default:
+ DEBUGPC(DMUX, "unsupported message type %d\n",
+ frame->msg_type);
+ return -EINVAL;
+ }
+
+ msg = msgb_alloc(sizeof(struct rtp_hdr) + payload_len, "RTP-GSM-FULL");
+ if (!msg)
+ return -ENOMEM;
+ rtph = (struct rtp_hdr *)msg->data;
+ rtph->version = RTP_VERSION;
+ rtph->padding = 0;
+ rtph->extension = 0;
+ rtph->csrc_count = 0;
+ rtph->marker = 0;
+ rtph->payload_type = payload_type;
+ rtph->sequence = htons(rs->transmit.sequence++);
+ rtph->timestamp = htonl(rs->transmit.timestamp);
+ rs->transmit.timestamp += duration;
+ rtph->ssrc = htonl(rs->transmit.ssrc);
+ memcpy(msg->data + sizeof(struct rtp_hdr), frame->data, payload_len);
+ msgb_put(msg, sizeof(struct rtp_hdr) + payload_len);
+ msgb_enqueue(&rss->tx_queue, msg);
+ rss->bfd.when |= BSC_FD_WRITE;
+
+ return 0;
+}
+
/* iterate over all chunks in one RTCP message, look for CNAME IEs and
* replace all of those with 'new_cname' */
static int rtcp_sdes_cname_mangle(struct msgb *msg, struct rtcp_hdr *rh,
@@ -123,10 +290,16 @@ static int rtcp_mangle(struct msgb *msg, struct rtp_socket *rs)
if (!mangle_rtcp_cname)
return 0;
+ printf("RTCP\n");
/* iterate over list of RTCP messages */
rtph = (struct rtcp_hdr *)msg->data;
- while ((void *)rtph + sizeof(*rtph) < (void *)msg->data + msg->len) {
+ while ((void *)rtph + sizeof(*rtph) <= (void *)msg->data + msg->len) {
old_len = (ntohs(rtph->length) + 1) * 4;
+ if ((void *)rtph + old_len > (void *)msg->data + msg->len) {
+ DEBUGPC(DMUX, "received RTCP packet too short for "
+ "length element\n");
+ return -EINVAL;
+ }
if (rtph->type == RTCP_TYPE_SDES) {
char new_cname[255];
strncpy(new_cname, inet_ntoa(rss->sin_local.sin_addr),
@@ -148,6 +321,7 @@ 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 msgb *new_msg;
struct rtp_sub_socket *other_rss;
if (!msg)
@@ -184,13 +358,40 @@ static int rtp_socket_read(struct rtp_socket *rs, struct rtp_sub_socket *rss)
break;
case RTP_RECV_UPSTREAM:
- case RTP_NONE:
- /* FIXME: other cases */
- DEBUGP(DMUX, "unhandled action: %d\n", rs->rx_action);
+ if (!rs->receive.callref || !rs->receive.net) {
+ rc = -EIO;
+ goto out_free;
+ }
+ if (rss->bfd.priv_nr == RTP_PRIV_RTCP) {
+ if (!mangle_rtcp_cname) {
+ msgb_free(msg);
+ break;
+ }
+ /* modify RTCP SDES CNAME */
+ rc = rtcp_mangle(msg, rs);
+ if (rc < 0)
+ goto out_free;
+ msgb_enqueue(&rss->tx_queue, msg);
+ rss->bfd.when |= BSC_FD_WRITE;
+ break;
+ }
+ if (rss->bfd.priv_nr != RTP_PRIV_RTP) {
+ rc = -EINVAL;
+ goto out_free;
+ }
+ rc = rtp_decode(msg, rs->receive.callref, &new_msg);
+ if (rc < 0)
+ goto out_free;
+ msgb_free(msg);
+ msgb_enqueue(&rs->receive.net->upqueue, new_msg);
+ break;
+
+ case RTP_NONE: /* if socket exists, but disabled by app */
+ msgb_free(msg);
break;
}
- return rc;
+ return 0;
out_free:
msgb_free(msg);
@@ -420,6 +621,22 @@ int rtp_socket_proxy(struct rtp_socket *this, struct rtp_socket *other)
return 0;
}
+/* bind RTP/RTCP socket to application */
+int rtp_socket_upstream(struct rtp_socket *this, struct gsm_network *net, u_int32_t callref)
+{
+ DEBUGP(DMUX, "rtp_socket_proxy(this=%p, callref=%lu)\n",
+ this, callref);
+
+ if (callref) {
+ this->rx_action = RTP_RECV_UPSTREAM;
+ this->receive.net = net;
+ this->receive.callref = callref;
+ } else
+ this->rx_action = RTP_NONE;
+
+ return 0;
+}
+
static void free_tx_queue(struct rtp_sub_socket *rss)
{
struct msgb *msg;
diff --git a/openbsc/src/trau_mux.c b/openbsc/src/trau_mux.c
index 7ea65ce35..477ea21e5 100644
--- a/openbsc/src/trau_mux.c
+++ b/openbsc/src/trau_mux.c
@@ -32,6 +32,19 @@
#include <openbsc/debug.h>
#include <openbsc/talloc.h>
+u_int8_t gsm_fr_map[] = {
+ 6, 6, 5, 5, 4, 4, 3, 3,
+ 7, 2, 2, 6, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 7, 2, 2, 6, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 7, 2, 2, 6, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 7, 2, 2, 6, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3
+};
+
struct map_entry {
struct llist_head list;
struct gsm_e1_subslot src, dst;
@@ -144,6 +157,8 @@ lookup_trau_upqueue(const struct gsm_e1_subslot *src)
return NULL;
}
+static const u_int8_t c_bits_check[] = { 0, 0, 0, 1, 0 };
+
/* we get called by subchan_demux */
int trau_mux_input(struct gsm_e1_subslot *src_e1_ss,
const u_int8_t *trau_bits, int num_bits)
@@ -153,8 +168,6 @@ int trau_mux_input(struct gsm_e1_subslot *src_e1_ss,
struct gsm_e1_subslot *dst_e1_ss = lookup_trau_mux_map(src_e1_ss);
struct subch_mux *mx;
struct upqueue_entry *ue;
- struct msgb *msg;
- struct gsm_trau_frame *frame;
int rc;
/* decode TRAU, change it to downlink, re-encode */
@@ -163,19 +176,44 @@ int trau_mux_input(struct gsm_e1_subslot *src_e1_ss,
return rc;
if (!dst_e1_ss) {
+ struct msgb *msg;
+ struct gsm_data_frame *frame;
+ unsigned char *data;
+ int i, j, k, l, o;
/* frame shall be sent to upqueue */
if (!(ue = lookup_trau_upqueue(src_e1_ss)))
return -EINVAL;
if (!ue->callref)
return -EINVAL;
- msg = msgb_alloc(sizeof(struct gsm_trau_frame) + sizeof(tf),
- "TRAU");
+ if (memcpy(tf.c_bits, c_bits_check, sizeof(c_bits_check)))
+ DEBUGPC(DMUX, "illegal trau (C1-C5) %s\n",
+ hexdump(tf.c_bits, sizeof(c_bits_check)));
+ msg = msgb_alloc(sizeof(struct gsm_data_frame) + 33,
+ "GSM-DATA");
if (!msg)
return -ENOMEM;
- frame = (struct gsm_trau_frame *)msg->data;
- frame->msg_type = GSM_TRAU_FRAME;
+
+ frame = (struct gsm_data_frame *)msg->data;
+ memset(frame, 0, sizeof(struct gsm_data_frame));
+ data = frame->data;
+ data[0] = 0xd << 4;
+ /* reassemble d-bits */
+ i = 0; /* counts bits */
+ j = 4; /* counts output bits */
+ k = gsm_fr_map[0]-1; /* current number bit in element */
+ l = 0; /* counts element bits */
+ o = 0; /* offset input bits */
+ while (i < 260) {
+ data[j/8] |= (tf.d_bits[k+o] << (7-(j%8)));
+ if (--k < 0) {
+ o += gsm_fr_map[l];
+ k = gsm_fr_map[++l]-1;
+ }
+ i++;
+ j++;
+ }
+ frame->msg_type = GSM_TCHF_FRAME;
frame->callref = ue->callref;
- memcpy(frame->data, &tf, sizeof(tf));
msgb_enqueue(&ue->net->upqueue, msg);
return 0;
@@ -221,17 +259,53 @@ int trau_recv_lchan(struct gsm_lchan *lchan, u_int32_t callref)
return 0;
}
-int trau_send_lchan(struct gsm_lchan *lchan, struct decoded_trau_frame *tf)
+int trau_send_frame(struct gsm_lchan *lchan, struct gsm_data_frame *frame)
{
u_int8_t trau_bits_out[TRAU_FRAME_BITS];
struct gsm_e1_subslot *dst_e1_ss = &lchan->ts->e1_link;
struct subch_mux *mx;
+ int i, j, k, l, o;
+ unsigned char *data = frame->data;
+ struct decoded_trau_frame tf;
mx = e1inp_get_mux(dst_e1_ss->e1_nr, dst_e1_ss->e1_ts);
if (!mx)
return -EINVAL;
- encode_trau_frame(trau_bits_out, tf);
+ switch (frame->msg_type) {
+ case GSM_TCHF_FRAME:
+ /* set c-bits and t-bits */
+ tf.c_bits[0] = 1;
+ tf.c_bits[1] = 1;
+ tf.c_bits[2] = 1;
+ tf.c_bits[3] = 0;
+ tf.c_bits[4] = 0;
+ memset(&tf.c_bits[5], 0, 6);
+ memset(&tf.c_bits[11], 1, 10);
+ memset(&tf.t_bits[0], 1, 4);
+ /* reassemble d-bits */
+ i = 0; /* counts bits */
+ j = 4; /* counts input bits */
+ k = gsm_fr_map[0]-1; /* current number bit in element */
+ l = 0; /* counts element bits */
+ o = 0; /* offset output bits */
+ while (i < 260) {
+ tf.d_bits[k+o] = (data[j/8] >> (7-(j%8))) & 1;
+ if (--k < 0) {
+ o += gsm_fr_map[l];
+ k = gsm_fr_map[++l]-1;
+ }
+ i++;
+ j++;
+ }
+ break;
+ default:
+ DEBUGPC(DMUX, "unsupported message type %d\n",
+ frame->msg_type);
+ return -EINVAL;
+ }
+
+ encode_trau_frame(trau_bits_out, &tf);
/* and send it to the muxer */
return subchan_mux_enqueue(mx, dst_e1_ss->e1_ts_ss, trau_bits_out,