diff options
| -rw-r--r-- | openbsc/src/nat/bsc_nat.c | 64 |
1 files changed, 60 insertions, 4 deletions
diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c index c7d97aa45..e71ab0fcf 100644 --- a/openbsc/src/nat/bsc_nat.c +++ b/openbsc/src/nat/bsc_nat.c @@ -303,6 +303,63 @@ static void bsc_send_data(struct bsc_connection *bsc, const uint8_t *data, unsig bsc_write(bsc, msg, proto); } +/* + * Release an established connection. We will have to release it to the BSC + * and to the network and we do it the following way. + * 1.) Give up on the MSC side + * 1.1) Send a RLSD message, it is a bit non standard but should work, we + * ignore the RLC... we might complain about it. Other options would + * be to send a Release Request, handle the Release Complete.. + * 1.2) Mark the data structure to be con_local and wait for 2nd + * + * 2.) Give up on the BSC side + * 2.1) Depending on the con type reject the service, or just close it + */ +static void bsc_send_con_release(struct bsc_connection *bsc, struct sccp_connections *con) +{ + struct msgb *rlsd; + /* 1. release the network */ + rlsd = sccp_create_rlsd(&con->patched_ref, &con->remote_ref, + SCCP_RELEASE_CAUSE_END_USER_ORIGINATED); + if (!rlsd) + LOGP(DNAT, LOGL_ERROR, "Failed to create RLSD message.\n"); + else { + ipaccess_prepend_header(rlsd, IPAC_PROTO_SCCP); + queue_for_msc(con->msc_con, rlsd); + } + con->con_local = 1; + + /* 2. release the BSC side */ + if (con->con_type == NAT_CON_TYPE_LU) { + struct msgb *payload, *udt; + payload = gsm48_create_loc_upd_rej(GSM48_REJECT_PLMN_NOT_ALLOWED); + + if (payload) { + gsm0808_prepend_dtap_header(payload, 0); + udt = sccp_create_dt1(&con->real_ref, payload->data, payload->len); + if (udt) + bsc_write(bsc, udt, IPAC_PROTO_SCCP); + else + LOGP(DNAT, LOGL_ERROR, "Failed to create DT1\n"); + + msgb_free(payload); + } else { + LOGP(DNAT, LOGL_ERROR, "Failed to allocate LU Reject.\n"); + } + } + + rlsd = sccp_create_rlsd(&con->remote_ref, &con->real_ref, + SCCP_RELEASE_CAUSE_END_USER_ORIGINATED); + if (!rlsd) { + LOGP(DNAT, LOGL_ERROR, "Failed to allocate RLSD for the BSC.\n"); + sccp_connection_destroy(con); + return; + } + + con->con_type = NAT_CON_TYPE_LOCAL_REJECT; + bsc_write(bsc, rlsd, IPAC_PROTO_SCCP); +} + static void bsc_send_con_refuse(struct bsc_connection *bsc, struct bsc_nat_parsed *parsed, int con_type) { @@ -737,10 +794,9 @@ static int forward_sccp_to_msc(struct bsc_connection *bsc, struct msgb *msg) con_msc = con->msc_con; con_filter = con->con_local; } else { - LOGP(DNAT, LOGL_ERROR, "Should drop the connection.\n"); - con_bsc = con->bsc; - con_msc = con->msc_con; - con_filter = con->con_local; + bsc_send_con_release(bsc, con); + con = NULL; + goto exit2; } } break; |