diff options
author | Harald Welte <laforge@netfilter.org> | 2009-12-29 11:49:12 +0100 |
---|---|---|
committer | Harald Welte <laforge@netfilter.org> | 2010-01-01 10:59:20 +0100 |
commit | 510087752e46489b7ea61d72b3ab39540ce0d908 (patch) | |
tree | 08b0f8203147f4691a22ccfdc33198c274eb625a /openbsc/src/silent_call.c | |
parent | 83579ca8ff706cd2d5ed27a10fa90129bdd943f4 (diff) |
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.
Diffstat (limited to 'openbsc/src/silent_call.c')
-rw-r--r-- | openbsc/src/silent_call.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/openbsc/src/silent_call.c b/openbsc/src/silent_call.c index 500d1873d..2679db7a9 100644 --- a/openbsc/src/silent_call.c +++ b/openbsc/src/silent_call.c @@ -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; |