diff options
Diffstat (limited to 'src/gsm/gsm0808.c')
| -rw-r--r-- | src/gsm/gsm0808.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c index c952a9f8..2721a1b1 100644 --- a/src/gsm/gsm0808.c +++ b/src/gsm/gsm0808.c @@ -347,6 +347,58 @@ struct msgb *gsm0808_create_clear_rqst(uint8_t cause) return msg; } +struct msgb *gsm0808_create_paging(const char *imsi, const uint32_t *tmsi, + const struct gsm0808_cell_id_list *cil, + const uint8_t *chan_needed) +{ + struct msgb *msg; + uint8_t mid_buf[GSM48_MI_SIZE + 2]; + int mid_len; + uint32_t tmsi_sw; + + /* Mandatory emelents! */ + OSMO_ASSERT(imsi); + OSMO_ASSERT(cil); + + /* Malformed IMSI */ + OSMO_ASSERT(strlen(imsi) <= GSM48_MI_SIZE); + + msg = + msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, "paging"); + if (!msg) + return NULL; + + /* Message Type 3.2.2.1 */ + msgb_v_put(msg, BSS_MAP_MSG_PAGING); + + /* IMSI 3.2.2.6 */ + mid_len = gsm48_generate_mid_from_imsi(mid_buf, imsi); + msgb_tlv_put(msg, GSM0808_IE_IMSI, mid_len - 2, mid_buf + 2); + + /* TMSI 3.2.2.7 */ + if (tmsi) { + tmsi_sw = htonl(*tmsi); + msgb_tlv_put(msg, GSM0808_IE_TMSI, sizeof(*tmsi), + (uint8_t *) & tmsi_sw); + } + + /* Cell Identifier List 3.2.2.27 */ + if (cil) + gsm0808_enc_cell_id_list(msg, cil); + + /* Channel Needed 3.2.2.36 */ + if (chan_needed) { + msgb_tv_put(msg, GSM0808_IE_CHANNEL_NEEDED, + (*chan_needed) & 0x03); + } + + /* pre-pend the header */ + msg->l3h = + msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg)); + + return msg; +} + void gsm0808_prepend_dtap_header(struct msgb *msg, uint8_t link_id) { uint8_t *hh = msgb_push(msg, 3); |