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-rw-r--r--openbsc/include/openbsc/md5.h59
-rw-r--r--openbsc/include/openbsc/mncc.h4
-rw-r--r--openbsc/include/openbsc/rtp_proxy.h16
-rw-r--r--openbsc/include/openbsc/transaction.h3
-rw-r--r--openbsc/include/openbsc/trau_mux.h2
-rw-r--r--openbsc/src/Makefile.am2
-rw-r--r--openbsc/src/gsm_04_08.c113
-rw-r--r--openbsc/src/md5c.c323
-rw-r--r--openbsc/src/rtp_proxy.c278
-rw-r--r--openbsc/src/trau_mux.c90
10 files changed, 838 insertions, 52 deletions
diff --git a/openbsc/include/openbsc/md5.h b/openbsc/include/openbsc/md5.h
new file mode 100644
index 000000000..938c257a9
--- /dev/null
+++ b/openbsc/include/openbsc/md5.h
@@ -0,0 +1,59 @@
+/*
+ * MD5.H - header file for MD5C.C
+ */
+
+/*
+ * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights
+ * reserved.
+ *
+ * License to copy and use this software is granted provided that it is
+ * identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm"
+ * in all material mentioning or referencing this software or this function.
+ *
+ * License is also granted to make and use derivative works provided that such
+ * works are identified as "derived from the RSA Data Security, Inc. MD5
+ * Message-Digest Algorithm" in all material mentioning or referencing the
+ * derived work.
+ *
+ * RSA Data Security, Inc. makes no representations concerning either the
+ * merchantability of this software or the suitability of this software for
+ * any particular purpose. It is provided "as is" without express or implied
+ * warranty of any kind.
+ *
+ * These notices must be retained in any copies of any part of this
+ * documentation and/or software.
+ */
+
+#ifndef _MD5_H
+#define _MD5_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* POINTER defines a generic pointer type */
+typedef unsigned char *POINTER;
+
+/* UINT2 defines a two byte word */
+typedef unsigned short int UINT2;
+
+/* UINT4 defines a four byte word */
+typedef unsigned long int UINT4;
+
+/* MD5 context. */
+typedef struct {
+ UINT4 state[4]; /* state (ABCD) */
+ UINT4 count[2]; /* number of bits, modulo 2^64 (lsb
+ * first) */
+ unsigned char buffer[64]; /* input buffer */
+} MD5_CTX;
+
+void MD5Init (MD5_CTX *);
+void MD5Update (MD5_CTX *, unsigned char *, unsigned int);
+void MD5Final (unsigned char[16], MD5_CTX *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* md5.h */
diff --git a/openbsc/include/openbsc/mncc.h b/openbsc/include/openbsc/mncc.h
index 68d76abf8..4b749e8ac 100644
--- a/openbsc/include/openbsc/mncc.h
+++ b/openbsc/include/openbsc/mncc.h
@@ -87,7 +87,7 @@ struct gsm_call {
#define MNCC_FRAME_DROP 0x0202
#define MNCC_LCHAN_MODIFY 0x0203
-#define GSM_TRAU_FRAME 0x0300
+#define GSM_TCHF_FRAME 0x0300
#define GSM_MAX_FACILITY 128
#define GSM_MAX_SSVERSION 128
@@ -199,7 +199,7 @@ struct gsm_mncc {
unsigned char lchan_mode;
};
-struct gsm_trau_frame {
+struct gsm_data_frame {
u_int32_t msg_type;
u_int32_t callref;
unsigned char data[0];
diff --git a/openbsc/include/openbsc/rtp_proxy.h b/openbsc/include/openbsc/rtp_proxy.h
index e9fc157cf..a3e45964c 100644
--- a/openbsc/include/openbsc/rtp_proxy.h
+++ b/openbsc/include/openbsc/rtp_proxy.h
@@ -34,6 +34,11 @@ enum rtp_rx_action {
RTP_RECV_UPSTREAM,
};
+enum rtp_tx_action {
+ RTP_SEND_NONE,
+ RTP_SEND_DOWNSTREAM,
+};
+
struct rtp_sub_socket {
struct sockaddr_in sin_local;
struct sockaddr_in sin_remote;
@@ -56,15 +61,24 @@ struct rtp_socket {
struct rtp_socket *other_sock;
} proxy;
struct {
- void (*recv_cb)(struct msgb *msg);
+ struct gsm_network *net;
+ u_int32_t callref;
} receive;
};
+ enum rtp_tx_action tx_action;
+ struct {
+ u_int16_t sequence;
+ u_int32_t timestamp;
+ u_int32_t ssrc;
+ } transmit;
};
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_upstream(struct rtp_socket *this, struct gsm_network *net, u_int32_t callref);
int rtp_socket_free(struct rtp_socket *rs);
+int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame);
#endif /* _RTP_PROXY_H */
diff --git a/openbsc/include/openbsc/transaction.h b/openbsc/include/openbsc/transaction.h
index 961a64923..6ffe25476 100644
--- a/openbsc/include/openbsc/transaction.h
+++ b/openbsc/include/openbsc/transaction.h
@@ -26,6 +26,9 @@ struct gsm_trans {
/* reference from MNCC or other application */
u_int32_t callref;
+ /* if traffic channel receive was requested */
+ int tch_recv;
+
union {
struct {
diff --git a/openbsc/include/openbsc/trau_mux.h b/openbsc/include/openbsc/trau_mux.h
index 90535add4..8deb708de 100644
--- a/openbsc/include/openbsc/trau_mux.h
+++ b/openbsc/include/openbsc/trau_mux.h
@@ -46,4 +46,4 @@ int trau_mux_input(struct gsm_e1_subslot *src_e1_ss,
int trau_recv_lchan(struct gsm_lchan *lchan, u_int32_t callref);
/* send trau from application */
-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);
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 9c8fa7b4d..100641e63 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -14,7 +14,7 @@ libbsc_a_SOURCES = abis_rsl.c abis_nm.c gsm_data.c gsm_04_08_utils.c \
talloc_ctx.c
libmsc_a_SOURCES = gsm_subscriber.c db.c telnet_interface.c \
- mncc.c rtp_proxy.c gsm_04_08.c gsm_04_11.c transaction.c \
+ mncc.c rtp_proxy.c md5c.c gsm_04_08.c gsm_04_11.c transaction.c \
token_auth.c rrlp.c gsm_04_80.c ussd.c silent_call.c
libvty_a_SOURCES = vty/buffer.c vty/command.c vty/vector.c vty/vty.c
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index 1f8235411..9eff60f8e 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -1812,6 +1812,8 @@ static int setup_trig_pag_evt(unsigned int hooknum, unsigned int event,
return 0;
}
+static int tch_recv(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)
@@ -1819,6 +1821,8 @@ static int handle_abisip_signal(unsigned int subsys, unsigned int signal,
struct gsm_lchan *lchan = signal_data;
struct gsm_bts_trx_ts *ts;
int rc;
+ struct gsm_network *net;
+ struct gsm_trans *trans;
if (subsys != SS_ABISIP)
return 0;
@@ -1847,6 +1851,14 @@ static int handle_abisip_signal(unsigned int subsys, unsigned int signal,
ts->abis_ip.bound_port);
if (rc < 0)
goto out_err;
+ /* receive if whish is pending */
+ net = ts->trx->bts->network;
+ llist_for_each_entry(trans, &net->trans_list, entry) {
+ if (trans->lchan == lchan && trans->tch_recv) {
+ DEBUGP(DCC, "is pending tch_recv whish\n");
+ tch_recv(net, trans->callref, 1);
+ }
+ }
break;
case S_ABISIP_DLCX_IND:
/* the BTS tells us a RTP stream has been disconnected */
@@ -1895,7 +1907,8 @@ 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) {
@@ -1904,6 +1917,7 @@ 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->ts->abis_ip.rtp_socket,
@@ -1929,8 +1943,7 @@ 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;
@@ -1953,44 +1966,59 @@ static int tch_bridge(struct gsm_network *net, u_int32_t *refs)
}
/* enable receive of channels to upqueue */
-static int tch_recv(struct gsm_network *net, struct gsm_mncc *data, int enable)
+static int tch_recv(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 socket yet */
+ if (!lchan->ts->abis_ip.rtp_socket) {
+ trans->tch_recv = enable;
+ DEBUGP(DCC, "queue tch_recv whish (%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->ts->abis_ip.rtp_socket,
+ net, callref);
+ } else
+ rtp_socket_upstream(lchan->ts->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");
@@ -3217,11 +3245,30 @@ 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(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(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->ts->abis_ip.rtp_socket)
+ return 0;
+ return rtp_send_frame(trans->lchan->ts->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/md5c.c b/openbsc/src/md5c.c
new file mode 100644
index 000000000..4b1d15e9a
--- /dev/null
+++ b/openbsc/src/md5c.c
@@ -0,0 +1,323 @@
+/*
+ * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
+ */
+
+/*
+ * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights
+ * reserved.
+ *
+ * License to copy and use this software is granted provided that it is
+ * identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm"
+ * in all material mentioning or referencing this software or this function.
+ *
+ * License is also granted to make and use derivative works provided that such
+ * works are identified as "derived from the RSA Data Security, Inc. MD5
+ * Message-Digest Algorithm" in all material mentioning or referencing the
+ * derived work.
+ *
+ * RSA Data Security, Inc. makes no representations concerning either the
+ * merchantability of this software or the suitability of this software for
+ * any particular purpose. It is provided "as is" without express or implied
+ * warranty of any kind.
+ *
+ * These notices must be retained in any copies of any part of this
+ * documentation and/or software.
+ */
+
+#include "openbsc/md5.h"
+
+#include <string.h>
+
+/*
+ * Constants for MD5Transform routine.
+ */
+#define S11 7
+#define S12 12
+#define S13 17
+#define S14 22
+#define S21 5
+#define S22 9
+#define S23 14
+#define S24 20
+#define S31 4
+#define S32 11
+#define S33 16
+#define S34 23
+#define S41 6
+#define S42 10
+#define S43 15
+#define S44 21
+
+static void MD5Transform (UINT4[4], unsigned char[64]);
+static void Encode (unsigned char *, UINT4 *, unsigned int);
+static void Decode (UINT4 *, unsigned char *, unsigned int);
+
+static unsigned char PADDING[64] = {
+ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/*
+ * F, G, H and I are basic MD5 functions.
+ */
+#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
+#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
+#define H(x, y, z) ((x) ^ (y) ^ (z))
+#define I(x, y, z) ((y) ^ ((x) | (~z)))
+
+/*
+ * ROTATE_LEFT rotates x left n bits.
+ */
+#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
+
+/*
+ * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is
+ * separate from addition to prevent recomputation.
+ */
+#define FF(a, b, c, d, x, s, ac) { \
+ (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
+ (a) = ROTATE_LEFT ((a), (s)); \
+ (a) += (b); \
+ }
+#define GG(a, b, c, d, x, s, ac) { \
+ (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
+ (a) = ROTATE_LEFT ((a), (s)); \
+ (a) += (b); \
+ }
+#define HH(a, b, c, d, x, s, ac) { \
+ (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
+ (a) = ROTATE_LEFT ((a), (s)); \
+ (a) += (b); \
+ }
+#define II(a, b, c, d, x, s, ac) { \
+ (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
+ (a) = ROTATE_LEFT ((a), (s)); \
+ (a) += (b); \
+ }
+
+/*
+ * MD5 initialization. Begins an MD5 operation, writing a new context.
+ */
+void
+MD5Init( MD5_CTX *context)/* context */
+{
+ context->count[0] = context->count[1] = 0;
+ /*
+ * Load magic initialization constants.
+ */
+ context->state[0] = 0x67452301;
+ context->state[1] = 0xefcdab89;
+ context->state[2] = 0x98badcfe;
+ context->state[3] = 0x10325476;
+}
+
+/*
+ * MD5 block update operation. Continues an MD5 message-digest operation,
+ * processing another message block, and updating the context.
+ */
+void
+MD5Update(
+ MD5_CTX *context,/* context */
+ unsigned char *input, /* input block */
+ unsigned int inputLen) /* length of input block */
+{
+ unsigned int i, index, partLen;
+
+ /* Compute number of bytes mod 64 */
+ index = (unsigned int) ((context->count[0] >> 3) & 0x3F);
+
+ /* Update number of bits */
+ if ((context->count[0] += ((UINT4) inputLen << 3))
+ < ((UINT4) inputLen << 3))
+ context->count[1]++;
+ context->count[1] += ((UINT4) inputLen >> 29);
+
+ partLen = 64 - index;
+
+ /*
+ * Transform as many times as possible.
+ */
+ if (inputLen >= partLen) {
+ memcpy
+ ((POINTER) & context->buffer[index], (POINTER) input, partLen);
+ MD5Transform(context->state, context->buffer);
+
+ for (i = partLen; i + 63 < inputLen; i += 64)
+ MD5Transform(context->state, &input[i]);
+
+ index = 0;
+ } else
+ i = 0;
+
+ /* Buffer remaining input */
+ memcpy
+ ((POINTER) & context->buffer[index], (POINTER) & input[i],
+ inputLen - i);
+}
+
+/*
+ * MD5 finalization. Ends an MD5 message-digest operation, writing the the
+ * message digest and zeroizing the context.
+ */
+void
+MD5Final(
+ unsigned char digest[16], /* message digest */
+ MD5_CTX *context) /* context */
+{
+ unsigned char bits[8];
+ unsigned int index, padLen;
+
+ /* Save number of bits */
+ Encode(bits, context->count, 8);
+
+ /*
+ * Pad out to 56 mod 64.
+ */
+ index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
+ padLen = (index < 56) ? (56 - index) : (120 - index);
+ MD5Update(context, PADDING, padLen);
+
+ /* Append length (before padding) */
+ MD5Update(context, bits, 8);
+
+ /* Store state in digest */
+ Encode(digest, context->state, 16);
+
+ /*
+ * Zeroize sensitive information.
+ */
+ memset((POINTER) context, 0, sizeof(*context));
+}
+
+/*
+ * MD5 basic transformation. Transforms state based on block.
+ */
+static void
+MD5Transform(
+ UINT4 state[4],
+ unsigned char block[64])
+{
+ UINT4 a = state[0], b = state[1], c = state[2], d = state[3],
+ x[16];
+
+ Decode(x, block, 64);
+
+ /* Round 1 */
+ FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
+ FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
+ FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */
+ FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
+ FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
+ FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
+ FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
+ FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
+ FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
+ FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
+ FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
+ FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
+ FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
+ FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
+ FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
+ FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
+
+ /* Round 2 */
+ GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
+ GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
+ GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
+ GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
+ GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
+ GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
+ GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
+ GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
+ GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
+ GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
+ GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
+ GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
+ GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
+ GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
+ GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
+ GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
+
+ /* Round 3 */
+ HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
+ HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
+ HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
+ HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
+ HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
+ HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
+ HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
+ HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
+ HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
+ HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
+ HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
+ HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
+ HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
+ HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
+ HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
+ HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
+
+ /* Round 4 */
+ II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
+ II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
+ II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
+ II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
+ II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
+ II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
+ II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
+ II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
+ II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
+ II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
+ II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
+ II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
+ II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
+ II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
+ II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
+ II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
+
+ state[0] += a;
+ state[1] += b;
+ state[2] += c;
+ state[3] += d;
+
+ /*
+ * Zeroize sensitive information.
+ */
+ memset((POINTER) x, 0, sizeof(x));
+}
+
+/*
+ * Encodes input (UINT4) into output (unsigned char). Assumes len is a
+ * multiple of 4.
+ */
+static void
+Encode( unsigned char *output,
+ UINT4 *input,
+ unsigned int len)
+{
+ unsigned int i, j;
+
+ for (i = 0, j = 0; j < len; i++, j += 4) {
+ output[j] = (unsigned char) (input[i] & 0xff);
+ output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
+ output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
+ output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
+ }
+}
+
+/*
+ * Decodes input (unsigned char) into output (UINT4). Assumes len is a
+ * multiple of 4.
+ */
+static void
+Decode( UINT4 *output,
+ unsigned char *input,
+ unsigned int len)
+{
+ unsigned int i, j;
+
+ for (i = 0, j = 0; j < len; i++, j += 4)
+ output[i] = ((UINT4) input[j]) | (((UINT4) input[j + 1]) << 8) |
+ (((UINT4) input[j + 2]) << 16) | (((UINT4) input[j + 3]) << 24);
+}
+
diff --git a/openbsc/src/rtp_proxy.c b/openbsc/src/rtp_proxy.c
index 59c0735a5..b92526e24 100644
--- a/openbsc/src/rtp_proxy.c
+++ b/openbsc/src/rtp_proxy.c
@@ -24,6 +24,11 @@
#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/md5.h" /* from RFC 1321 */
#include <openbsc/talloc.h>
#include <openbsc/gsm_data.h>
@@ -57,6 +62,220 @@ 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
+
+/*
+ * Generate a random 32-bit quantity. (Appendix A. 6)
+ */
+
+#define MD_CTX MD5_CTX
+#define MDInit MD5Init
+#define MDUpdate MD5Update
+#define MDFinal MD5Final
+
+static u_int32_t md_32(unsigned char *string, int length)
+{
+ MD_CTX context;
+ union {
+ char c[16];
+ u_int32_t x[4];
+ } digest;
+ u_int32_t r;
+ int i;
+
+ MDInit (&context);
+ MDUpdate (&context, string, length);
+ MDFinal ((unsigned char *)&digest, &context);
+ r = 0;
+ for (i = 0; i < 3; i++) {
+ r ^= digest.x[i];
+ }
+ return r;
+}
+
+/*
+ * Return random unsigned 32-bit quantity. Use 'type' argument if
+ * you need to generate several different values in close succession.
+ */
+static u_int32_t random32(int type)
+{
+ struct {
+ int type;
+ struct timeval tv;
+ clock_t cpu;
+ pid_t pid;
+ u_int32_t hid;
+ uid_t uid;
+ gid_t gid;
+ struct utsname name;
+ } s;
+
+ gettimeofday(&s.tv, 0);
+ uname(&s.name);
+ s.type = type;
+ s.cpu = clock();
+ s.pid = getpid();
+ s.hid = gethostid();
+ s.uid = getuid();
+ s.gid = getgid();
+ /* also: system uptime */
+
+ return md_32((unsigned char *)&s, sizeof(s));
+}
+
+/* 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 = random32(frame->callref);
+ 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 +342,15 @@ 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 lengt 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 +372,7 @@ 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 +409,40 @@ 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 +672,22 @@ 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 6a19f0c99..b060657c1 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;
@@ -151,8 +164,6 @@ 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 */
@@ -161,19 +172,44 @@ 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 (tf.c_bits[0]!=0 || tf.c_bits[1]!=0 || tf.c_bits[2]!=0 || tf.c_bits[3]!=1 || tf.c_bits[4]!=0)
+ DEBUGPC(DMUX, "illegal trau (C1-C5) %d %d %d %d %d\n", tf.c_bits[0], tf.c_bits[1],
+ tf.c_bits[2], tf.c_bits[3], tf.c_bits[4]);
+ 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;
@@ -219,17 +255,53 @@ 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,
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-10 19:57:52 +0000