diff options
Diffstat (limited to 'openbsc/src/silent_call.c')
| -rw-r--r-- | openbsc/src/silent_call.c | 56 |
1 files changed, 52 insertions, 4 deletions
diff --git a/openbsc/src/silent_call.c b/openbsc/src/silent_call.c index 82b656327..cada24e66 100644 --- a/openbsc/src/silent_call.c +++ b/openbsc/src/silent_call.c @@ -25,7 +25,7 @@ #include <unistd.h> #include <errno.h> -#include <openbsc/msgb.h> +#include <osmocore/msgb.h> #include <openbsc/signal.h> #include <openbsc/debug.h> #include <openbsc/paging.h> @@ -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) { @@ -53,6 +54,7 @@ static int paging_cb_silent(unsigned int hooknum, unsigned int event, case GSM_PAGING_SUCCEEDED: DEBUGPC(DSMS, "success, using Timeslot %u on ARFCN %u\n", lchan->ts->nr, lchan->ts->trx->arfcn); + lchan->silent_call = 1; /* increment lchan reference count */ dispatch_signal(SS_SCALL, S_SCALL_SUCCESS, &sigdata); use_lchan(lchan); @@ -69,15 +71,58 @@ static int paging_cb_silent(unsigned int hooknum, unsigned int event, return rc; } -int gsm_silent_call_start(struct gsm_subscriber *subscr, void *data) +/* 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 type) { int rc; - rc = paging_request(subscr->net, subscr, RSL_CHANNEED_TCH_F, + rc = paging_request(subscr->net, subscr, type, paging_cb_silent, data); return rc; } +/* end a silent call with a given subscriber */ int gsm_silent_call_stop(struct gsm_subscriber *subscr) { struct gsm_lchan *lchan; @@ -86,7 +131,10 @@ int gsm_silent_call_stop(struct gsm_subscriber *subscr) if (!lchan) return -EINVAL; - /* FIXME: did we actually establish a silent call for this guy? */ + /* did we actually establish a silent call for this guy? */ + if (!lchan->silent_call) + return -EINVAL; + put_lchan(lchan); return 0; |