diff options
author | Holger Hans Peter Freyther <zecke@selfish.org> | 2010-11-10 09:24:37 +0100 |
---|---|---|
committer | Holger Hans Peter Freyther <zecke@selfish.org> | 2010-11-15 20:06:49 +0100 |
commit | 890dfc58edf29dce73f5d645945aaf562453f25a (patch) | |
tree | 8635f6a1f97c449a43064b23323dbc88e1fefb0b /openbsc | |
parent | 3485feb49b9d87a84cacb9cad824b655d484e1d2 (diff) |
bsc: Work on paging and parsing other messages
The paging is not implemented due bad/missing API in the
BSC API, the rest are simple stubs to be merged from the
on-waves/bsc-master.
Diffstat (limited to 'openbsc')
-rw-r--r-- | openbsc/src/bsc/osmo_bsc_bssap.c | 141 |
1 files changed, 140 insertions, 1 deletions
diff --git a/openbsc/src/bsc/osmo_bsc_bssap.c b/openbsc/src/bsc/osmo_bsc_bssap.c index 44c652bbd..6ca535bd0 100644 --- a/openbsc/src/bsc/osmo_bsc_bssap.c +++ b/openbsc/src/bsc/osmo_bsc_bssap.c @@ -20,10 +20,132 @@ */ #include <openbsc/osmo_bsc.h> +#include <openbsc/osmo_bsc_grace.h> #include <openbsc/debug.h> +#include <osmocore/gsm0808.h> #include <osmocore/protocol/gsm_08_08.h> +#include <arpa/inet.h> + +static uint16_t read_data16(const uint8_t *data) +{ + uint16_t res; + + memcpy(&res, data, sizeof(res)); + return res; +} + +static int bssmap_handle_reset_ack(struct gsm_network *net, + struct msgb *msg, unsigned int length) +{ + LOGP(DMSC, LOGL_NOTICE, "Reset ACK from MSC\n"); + return 0; +} + +/* GSM 08.08 ยง 3.2.1.19 */ +static int bssmap_handle_paging(struct gsm_network *net, + struct msgb *msg, unsigned int payload_length) +{ + struct tlv_parsed tp; + char mi_string[GSM48_MI_SIZE]; + uint32_t tmsi = GSM_RESERVED_TMSI; + unsigned int lac = GSM_LAC_RESERVED_ALL_BTS; + uint8_t data_length; + const uint8_t *data; + uint8_t chan_needed = RSL_CHANNEED_ANY; + + tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, payload_length - 1, 0, 0); + + if (!TLVP_PRESENT(&tp, GSM0808_IE_IMSI)) { + LOGP(DMSC, LOGL_ERROR, "Mandantory IMSI not present.\n"); + return -1; + } else if ((TLVP_VAL(&tp, GSM0808_IE_IMSI)[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) { + LOGP(DMSC, LOGL_ERROR, "Wrong content in the IMSI\n"); + return -1; + } + + if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST)) { + LOGP(DMSC, LOGL_ERROR, "Mandantory CELL IDENTIFIER LIST not present.\n"); + return -1; + } + + if (TLVP_PRESENT(&tp, GSM0808_IE_TMSI)) { + gsm48_mi_to_string(mi_string, sizeof(mi_string), + TLVP_VAL(&tp, GSM0808_IE_TMSI), TLVP_LEN(&tp, GSM0808_IE_TMSI)); + tmsi = strtoul(mi_string, NULL, 10); + } + + + /* + * parse the IMSI + */ + gsm48_mi_to_string(mi_string, sizeof(mi_string), + TLVP_VAL(&tp, GSM0808_IE_IMSI), TLVP_LEN(&tp, GSM0808_IE_IMSI)); + + /* + * parse the cell identifier list + */ + data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST); + data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST); + + /* + * Support paging to all network or one BTS at one LAC + */ + if (data_length == 3 && data[0] == CELL_IDENT_LAC) { + lac = ntohs(read_data16(&data[1])); + } else if (data_length > 1 || (data[0] & 0x0f) != CELL_IDENT_BSS) { + LOGP(DMSC, LOGL_ERROR, "Unsupported Cell Identifier List: %s\n", hexdump(data, data_length)); + return -1; + } + + if (TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_NEEDED) && TLVP_LEN(&tp, GSM0808_IE_CHANNEL_NEEDED) == 1) + chan_needed = TLVP_VAL(&tp, GSM0808_IE_CHANNEL_NEEDED)[0] & 0x03; + + if (TLVP_PRESENT(&tp, GSM0808_IE_EMLPP_PRIORITY)) { + LOGP(DMSC, LOGL_ERROR, "eMLPP is not handled\n"); + } + + LOGP(DMSC, LOGL_DEBUG, "Paging request from MSC IMSI: '%s' TMSI: '0x%x/%u' LAC: 0x%x\n", mi_string, tmsi, tmsi, lac); + LOGP(DMSC, LOGL_ERROR, "Paging is not implemented...\n"); + return -1; +} + +static int bssmap_rcvmsg_udt(struct gsm_network *net, + struct msgb *msg, unsigned int length) +{ + int ret = 0; + + if (length < 1) { + LOGP(DMSC, LOGL_ERROR, "Not enough room: %d\n", length); + return -1; + } + + switch (msg->l4h[0]) { + case BSS_MAP_MSG_RESET_ACKNOWLEDGE: + ret = bssmap_handle_reset_ack(net, msg, length); + break; + case BSS_MAP_MSG_PAGING: + if (bsc_grace_allow_new_connection(net)) + ret = bssmap_handle_paging(net, msg, length); + break; + } + + return ret; +} + +static int bssmap_rcvmsg_dt1(struct osmo_bsc_sccp_con *conn, + struct msgb *msg, unsigned int length) +{ + return -1; +} + +static int dtap_rcvmsg(struct osmo_bsc_sccp_con *conn, + struct msgb *msg, unsigned int length) +{ + return -1; +} + int bsc_handle_udt(struct gsm_network *network, struct bsc_msc_connection *conn, struct msgb *msgb, unsigned int length) @@ -44,7 +166,8 @@ int bsc_handle_udt(struct gsm_network *network, switch (bs->type) { case BSSAP_MSG_BSS_MANAGEMENT: - LOGP(DMSC, LOGL_ERROR, "BSS management not implemented.\n"); + msgb->l4h = &msgb->l3h[sizeof(*bs)]; + bssmap_rcvmsg_udt(network, msgb, length - sizeof(*bs)); break; default: LOGP(DMSC, LOGL_ERROR, "Unimplemented msg type: %d\n", bs->type); @@ -56,5 +179,21 @@ int bsc_handle_udt(struct gsm_network *network, int bsc_handle_dt1(struct osmo_bsc_sccp_con *conn, struct msgb *msg, unsigned int len) { + if (len < sizeof(struct bssmap_header)) { + LOGP(DMSC, LOGL_ERROR, "The header is too short.\n"); + } + + switch (msg->l3h[0]) { + case BSSAP_MSG_BSS_MANAGEMENT: + msg->l4h = &msg->l3h[sizeof(struct bssmap_header)]; + bssmap_rcvmsg_dt1(conn, msg, len - sizeof(struct bssmap_header)); + break; + case BSSAP_MSG_DTAP: + dtap_rcvmsg(conn, msg, len); + break; + default: + LOGP(DMSC, LOGL_DEBUG, "Unimplemented msg type: %d\n", msg->l3h[0]); + } + return -1; } |