diff options
Diffstat (limited to 'openbsc/src/gsm_subscriber.c')
| -rw-r--r-- | openbsc/src/gsm_subscriber.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/openbsc/src/gsm_subscriber.c b/openbsc/src/gsm_subscriber.c index 22f08e320..06762a50d 100644 --- a/openbsc/src/gsm_subscriber.c +++ b/openbsc/src/gsm_subscriber.c @@ -27,13 +27,147 @@ #include <string.h> #include <assert.h> +#include <osmocore/talloc.h> + #include <openbsc/gsm_subscriber.h> #include <openbsc/debug.h> +#include <openbsc/paging.h> #include <openbsc/signal.h> #include <openbsc/db.h> +void *tall_sub_req_ctx; + extern struct llist_head *subscr_bsc_active_subscriber(void); + +/* + * Struct for pending channel requests. This is managed in the + * llist_head requests of each subscriber. The reference counting + * should work in such a way that a subscriber with a pending request + * remains in memory. + */ +struct subscr_request { + struct llist_head entry; + + /* back reference */ + struct gsm_subscriber *subscr; + + /* the requested channel type */ + int channel_type; + + /* the callback data */ + gsm_cbfn *cbfn; + void *param; +}; + +/* + * We got the channel assigned and can now hand this channel + * over to one of our callbacks. + */ +static int subscr_paging_cb(unsigned int hooknum, unsigned int event, + struct msgb *msg, void *data, void *param) +{ + struct subscr_request *request; + struct gsm_subscriber *subscr = (struct gsm_subscriber *)param; + + /* There is no request anymore... */ + if (llist_empty(&subscr->requests)) + return -1; + + /* + * FIXME: What to do with paging requests coming during + * this callback? We must be sure to not start paging when + * we have an active connection to a subscriber and to make + * the subscr_put_channel work as required... + */ + request = (struct subscr_request *)subscr->requests.next; + llist_del(&request->entry); + subscr->in_callback = 1; + request->cbfn(hooknum, event, msg, data, request->param); + subscr->in_callback = 0; + + subscr_put(subscr); + talloc_free(request); + return 0; +} + +static void subscr_send_paging_request(struct gsm_subscriber *subscr) +{ + struct subscr_request *request; + int rc; + + assert(!llist_empty(&subscr->requests)); + + request = (struct subscr_request *)subscr->requests.next; + rc = paging_request(subscr->net, subscr, request->channel_type, + subscr_paging_cb, subscr); + + /* paging failed, quit now */ + if (rc <= 0) { + subscr_paging_cb(GSM_HOOK_RR_PAGING, GSM_PAGING_EXPIRED, + NULL, NULL, subscr); + } +} + +void subscr_get_channel(struct gsm_subscriber *subscr, + int type, gsm_cbfn *cbfn, void *param) +{ + struct subscr_request *request; + + request = talloc(tall_sub_req_ctx, struct subscr_request); + if (!request) { + if (cbfn) + cbfn(GSM_HOOK_RR_PAGING, GSM_PAGING_OOM, + NULL, NULL, param); + return; + } + + memset(request, 0, sizeof(*request)); + request->subscr = subscr_get(subscr); + request->channel_type = type; + request->cbfn = cbfn; + request->param = param; + + /* + * FIXME: We might be able to assign more than one + * channel, e.g. voice and SMS submit at the same + * time. + */ + if (!subscr->in_callback && llist_empty(&subscr->requests)) { + /* add to the list, send a request */ + llist_add_tail(&request->entry, &subscr->requests); + subscr_send_paging_request(subscr); + } else { + /* this will be picked up later, from subscr_put_channel */ + llist_add_tail(&request->entry, &subscr->requests); + } +} + +void subscr_put_channel(struct gsm_subscriber_connection *conn) +{ + /* + * FIXME: Continue with other requests now... by checking + * the gsm_subscriber inside the gsm_lchan. Drop the ref count + * of the lchan after having asked the next requestee to handle + * the channel. + */ + /* + * FIXME: is the lchan is of a different type we could still + * issue an immediate assignment for another channel and then + * close this one. + */ + /* + * Currently we will drop the last ref of the lchan which + * will result in a channel release on RSL and we will start + * the paging. This should work most of the time as the MS + * will listen to the paging requests before we timeout + */ + + if (conn->subscr && !llist_empty(&conn->subscr->requests)) + subscr_send_paging_request(conn->subscr); +} + + struct gsm_subscriber *subscr_get_by_tmsi(struct gsm_network *net, u_int32_t tmsi) { |