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bsc_api: Add some more comments to the code

This commit is contained in:
Harald Welte 2011-09-13 00:02:09 +01:00
parent 4329099e28
commit b70bd52c2a
1 changed files with 10 additions and 0 deletions
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10
openbsc/src/libbsc/bsc_api.c
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@ -270,6 +270,7 @@ int bsc_api_init(struct gsm_network *network, struct bsc_api *api)
return 0;
}
/*! \brief process incoming 08.08 DTAP from MSC (send via BTS to MS) */
int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
struct msgb *msg, int link_id, int allow_sach)
{
@ -294,7 +295,9 @@ int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
}
msg->l3h = msg->data;
/* is requested SAPI already up? */
if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) {
/* Establish L2 for additional SAPI */
OBSC_LINKID_CB(msg) = link_id;
if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) {
msgb_free(msg);
@ -303,6 +306,7 @@ int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
}
return 0;
} else {
/* Directly forward via RLL/RSL to BTS */
return rsl_data_request(msg, link_id);
}
}
@ -469,6 +473,7 @@ static void dispatch_dtap(struct gsm_subscriber_connection *conn,
api->dtap(conn, link_id, msg);
}
/*! \brief RSL has received a DATA INDICATION with L3 from MS */
int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
{
int rc;
@ -484,8 +489,11 @@ int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
if (lchan->conn) {
/* if we already have a connection, forward via DTAP to
* MSC */
dispatch_dtap(lchan->conn, link_id, msg);
} else {
/* allocate a new connection */
rc = BSC_API_CONN_POL_REJECT;
lchan->conn = subscr_con_allocate(msg->lchan);
if (!lchan->conn) {
@ -493,6 +501,7 @@ int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
return -1;
}
/* fwd via bsc_api to send COMPLETE L3 INFO to MSC */
rc = api->compl_l3(lchan->conn, msg, 0);
if (rc != BSC_API_CONN_POL_ACCEPT) {
@ -505,6 +514,7 @@ int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
return 0;
}
/*! \brief We received a GSM 08.08 CIPHER MODE from the MSC */
int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
const uint8_t *key, int len, int include_imeisv)
{