diff options
| author | Harald Welte <laforge@gnumonks.org> | 2011-09-13 00:02:09 +0100 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2011-09-13 00:02:09 +0100 |
| commit | b70bd52c2a88c32145c64f2abebab016a8756c6a (patch) | |
| tree | 6c6b4e325dd8a4e405b222f5d57c275e7485f3c7 /openbsc | |
| parent | 4329099e284cdc82c1ff8da7e1c447489438f602 (diff) | |
bsc_api: Add some more comments to the code
Diffstat (limited to 'openbsc')
| -rw-r--r-- | openbsc/src/libbsc/bsc_api.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/openbsc/src/libbsc/bsc_api.c b/openbsc/src/libbsc/bsc_api.c index 9504e538c..c1aedb2fb 100644 --- a/openbsc/src/libbsc/bsc_api.c +++ b/openbsc/src/libbsc/bsc_api.c @@ -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) { |