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osmo-msc
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introduce and implement silent_call_reroute() and silent_call_rx() 

Thise two functions are interfacing with the 04.08 layer 3 to
determine if a particular message should be handled inside
the OpenBSC layer 3, or if it should be handled in the silent call
handler.
This commit is contained in:
Harald Welte 2009-12-29 11:49:12 +01:00
parent 83579ca8ff
commit 510087752e
3 changed files with 50 additions and 0 deletions
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2
openbsc/include/openbsc/silent_call.h
View File

@ -3,5 +3,7 @@
extern int gsm_silent_call_start(struct gsm_subscriber *subscr, void *data);
extern int gsm_silent_call_stop(struct gsm_subscriber *subscr);
extern int silent_call_rx(struct msgb *msg);
extern int silent_call_reroute(struct msgb *msg);
#endif /* _SILENT_CALL_H */

4
openbsc/src/gsm_04_08.c
View File

@ -50,6 +50,7 @@
#include <openbsc/talloc.h>
#include <openbsc/transaction.h>
#include <openbsc/ussd.h>
#include <openbsc/silent_call.h>
#define GSM_MAX_FACILITY 128
#define GSM_MAX_SSVERSION 128
@ -3500,6 +3501,9 @@ int gsm0408_rcvmsg(struct msgb *msg, u_int8_t link_id)
struct gsm48_hdr *gh = msgb_l3(msg);
u_int8_t pdisc = gh->proto_discr & 0x0f;
int rc = 0;
if (silent_call_reroute(msg))
return silent_call_rx(msg);
switch (pdisc) {
case GSM48_PDISC_CC:

44
openbsc/src/silent_call.c
View File

@ -34,6 +34,7 @@
#include <openbsc/abis_rsl.h>
#include <openbsc/chan_alloc.h>
/* paging of the requested subscriber has completed */
static int paging_cb_silent(unsigned int hooknum, unsigned int event,
struct msgb *msg, void *_lchan, void *_data)
{
@ -70,6 +71,48 @@ static int paging_cb_silent(unsigned int hooknum, unsigned int event,
return rc;
}
/* receive a layer 3 message from a silent call */
int silent_call_rx(struct msgb *msg)
{
/* FIXME: do something like sending it through a UDP port */
return 0;
}
struct msg_match {
u_int8_t pdisc;
u_int8_t msg_type;
};
/* list of messages that are handled inside OpenBSC, even in a silent call */
static const struct msg_match silent_call_accept[] = {
{ GSM48_PDISC_MM, GSM48_MT_MM_LOC_UPD_REQUEST },
{ GSM48_PDISC_MM, GSM48_MT_MM_CM_SERV_REQ },
};
/* decide if we need to reroute a message as part of a silent call */
int silent_call_reroute(struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
u_int8_t pdisc = gh->proto_discr & 0x0f;
int i;
/* if we're not part of a silent call, never reroute */
if (!msg->lchan->silent_call)
return 0;
/* check if we are a special message that is handled in openbsc */
for (i = 0; i < ARRAY_SIZE(silent_call_accept); i++) {
if (silent_call_accept[i].pdisc == pdisc &&
silent_call_accept[i].msg_type == gh->msg_type)
return 0;
}
/* otherwise, reroute */
return 1;
}
/* initiate a silent call with a given subscriber */
int gsm_silent_call_start(struct gsm_subscriber *subscr, void *data)
{
int rc;
@ -79,6 +122,7 @@ int gsm_silent_call_start(struct gsm_subscriber *subscr, void *data)
return rc;
}
/* end a silent call with a given subscriber */
int gsm_silent_call_stop(struct gsm_subscriber *subscr)
{
struct gsm_lchan *lchan;