diff options
| -rw-r--r-- | openbsc/include/openbsc/gprs_bssgp.h | 16 | ||||
| -rw-r--r-- | openbsc/src/libgb/Makefile.am | 2 | ||||
| -rw-r--r-- | openbsc/src/libgb/gprs_bssgp.c | 11 | ||||
| -rw-r--r-- | openbsc/src/libgb/gprs_bssgp_bss.c | 426 |
4 files changed, 442 insertions, 13 deletions
diff --git a/openbsc/include/openbsc/gprs_bssgp.h b/openbsc/include/openbsc/gprs_bssgp.h index 1205aa81..df93f5b2 100644 --- a/openbsc/include/openbsc/gprs_bssgp.h +++ b/openbsc/include/openbsc/gprs_bssgp.h @@ -183,6 +183,18 @@ struct bssgp_bvc_ctx *btsctx_by_raid_cid(const struct gprs_ra_id *raid, uint16_t /* Find a BTS context based on BVCI+NSEI tuple */ struct bssgp_bvc_ctx *btsctx_by_bvci_nsei(uint16_t bvci, uint16_t nsei); +#define BVC_F_BLOCKED 0x0001 + +enum bssgp_ctr { + BSSGP_CTR_PKTS_IN, + BSSGP_CTR_PKTS_OUT, + BSSGP_CTR_BYTES_IN, + BSSGP_CTR_BYTES_OUT, + BSSGP_CTR_BLOCKED, + BSSGP_CTR_DISCARDED, +}; + + #include <osmocom/gsm/tlv.h> /* BSSGP-UL-UNITDATA.ind */ @@ -193,6 +205,8 @@ struct sgsn_mm_ctx; int gprs_bssgp_tx_dl_ud(struct msgb *msg, struct sgsn_mm_ctx *mmctx); uint16_t bssgp_parse_cell_id(struct gprs_ra_id *raid, const uint8_t *buf); +int bssgp_create_cell_id(uint8_t *buf, const struct gprs_ra_id *raid, + uint16_t cid); /* Wrapper around TLV parser to parse BSSGP IEs */ static inline int bssgp_tlv_parse(struct tlv_parsed *tp, uint8_t *buf, int len) @@ -220,7 +234,7 @@ struct bssgp_paging_info { enum bssgp_paging_scope scope; /*!< bssgp_paging_scope */ struct gprs_ra_id raid; /*!< RA Identifier */ uint16_t bvci; /*!< BVCI */ - const char *imsi; /*!< IMSI, if any */ + char *imsi; /*!< IMSI, if any */ uint32_t *ptmsi; /*!< P-TMSI, if any */ uint16_t drx_params; /*!< DRX parameters */ uint8_t qos[3]; /*!< QoS parameters */ diff --git a/openbsc/src/libgb/Makefile.am b/openbsc/src/libgb/Makefile.am index 8ec10069..cb656ccc 100644 --- a/openbsc/src/libgb/Makefile.am +++ b/openbsc/src/libgb/Makefile.am @@ -5,5 +5,5 @@ AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOCORE_GSM) $(LIBOSMOVTY_LIBS) $(COVERAG noinst_LIBRARIES = libgb.a libgb_a_SOURCES = gprs_ns.c gprs_ns_frgre.c gprs_ns_vty.c \ - gprs_bssgp.c gprs_bssgp_util.c gprs_bssgp_vty.c + gprs_bssgp.c gprs_bssgp_util.c gprs_bssgp_vty.c gprs_bssgp_bss.c #gprs_llc.c gprs_llc_vty.c crc24.c diff --git a/openbsc/src/libgb/gprs_bssgp.c b/openbsc/src/libgb/gprs_bssgp.c index f26ff163..6722cafb 100644 --- a/openbsc/src/libgb/gprs_bssgp.c +++ b/openbsc/src/libgb/gprs_bssgp.c @@ -43,17 +43,6 @@ void *bssgp_tall_ctx = NULL; -#define BVC_F_BLOCKED 0x0001 - -enum bssgp_ctr { - BSSGP_CTR_PKTS_IN, - BSSGP_CTR_PKTS_OUT, - BSSGP_CTR_BYTES_IN, - BSSGP_CTR_BYTES_OUT, - BSSGP_CTR_BLOCKED, - BSSGP_CTR_DISCARDED, -}; - static const struct rate_ctr_desc bssgp_ctr_description[] = { { "packets.in", "Packets at BSSGP Level ( In)" }, { "packets.out","Packets at BSSGP Level (Out)" }, diff --git a/openbsc/src/libgb/gprs_bssgp_bss.c b/openbsc/src/libgb/gprs_bssgp_bss.c new file mode 100644 index 00000000..9d76c3aa --- /dev/null +++ b/openbsc/src/libgb/gprs_bssgp_bss.c @@ -0,0 +1,426 @@ +/* GPRS BSSGP protocol implementation as per 3GPP TS 08.18 */ + +/* (C) 2009-2011 by Harald Welte <laforge@gnumonks.org> + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <errno.h> +#include <stdint.h> + +#include <netinet/in.h> + +#include <osmocom/core/msgb.h> +#include <osmocom/core/rate_ctr.h> +#include <osmocom/gsm/tlv.h> +#include <osmocom/core/talloc.h> + +#include <openbsc/debug.h> +#include <openbsc/gsm_data.h> +#include <openbsc/gprs_bssgp.h> +#include <openbsc/gprs_ns.h> + +uint8_t *bssgp_msgb_tlli_put(struct msgb *msg, uint32_t tlli) +{ + uint32_t _tlli = htonl(tlli); + return msgb_tvlv_put(msg, BSSGP_IE_TLLI, 4, (uint8_t *) &_tlli); +} + +/*! \brief GMM-SUSPEND.req (Chapter 10.3.6) */ +int bssgp_tx_suspend(uint16_t nsei, uint32_t tlli, + const struct gprs_ra_id *ra_id) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + uint8_t ra[6]; + + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP (BVCI=0) Tx SUSPEND (TLLI=0x%04x)\n", + tlli); + msgb_nsei(msg) = nsei; + msgb_bvci(msg) = 0; /* Signalling */ + bgph->pdu_type = BSSGP_PDUT_SUSPEND; + + bssgp_msgb_tlli_put(msg, tlli); + + gsm48_construct_ra(ra, ra_id); + msgb_tvlv_put(msg, BSSGP_IE_ROUTEING_AREA, 6, ra); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/*! \brief GMM-RESUME.req (Chapter 10.3.9) */ +int bssgp_tx_resume(uint16_t nsei, uint32_t tlli, + const struct gprs_ra_id *ra_id, uint8_t suspend_ref) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + uint8_t ra[6]; + + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP (BVCI=0) Tx RESUME (TLLI=0x%04x)\n", + tlli); + msgb_nsei(msg) = nsei; + msgb_bvci(msg) = 0; /* Signalling */ + bgph->pdu_type = BSSGP_PDUT_RESUME; + + bssgp_msgb_tlli_put(msg, tlli); + + gsm48_construct_ra(ra, ra_id); + msgb_tvlv_put(msg, BSSGP_IE_ROUTEING_AREA, 6, ra); + + msgb_tvlv_put(msg, BSSGP_IE_SUSPEND_REF_NR, 1, &suspend_ref); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/*! \brief Transmit RA-CAPABILITY-UPDATE (10.3.3) */ +int bssgp_tx_ra_capa_upd(struct bssgp_bvc_ctx *bctx, uint32_t tlli, uint8_t tag) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP (BVCI=%u) Tx RA-CAPA-UPD (TLLI=0x%04x)\n", + bctx->bvci, tlli); + + /* set NSEI and BVCI in msgb cb */ + msgb_nsei(msg) = bctx->nsei; + msgb_bvci(msg) = bctx->bvci; + + bgph->pdu_type = BSSGP_PDUT_RA_CAPA_UDPATE; + bssgp_msgb_tlli_put(msg, tlli); + + msgb_tvlv_put(msg, BSSGP_IE_TAG, 1, &tag); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/* first common part of RADIO-STATUS */ +static struct msgb *common_tx_radio_status(struct bssgp_bvc_ctx *bctx) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP (BVCI=%u) Tx RADIO-STATUS ", + bctx->bvci); + + /* set NSEI and BVCI in msgb cb */ + msgb_nsei(msg) = bctx->nsei; + msgb_bvci(msg) = bctx->bvci; + + bgph->pdu_type = BSSGP_PDUT_RADIO_STATUS; + + return msg; +} + +/* second common part of RADIO-STATUS */ +static int common_tx_radio_status2(struct msgb *msg, uint8_t cause) +{ + msgb_tvlv_put(msg, BSSGP_IE_CAUSE, 1, &cause); + LOGPC(DBSSGP, LOGL_NOTICE, "CAUSE=%u\n", cause); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/*! \brief Transmit RADIO-STATUS for TLLI (10.3.5) */ +int bssgp_tx_radio_status_tlli(struct bssgp_bvc_ctx *bctx, uint8_t cause, + uint32_t tlli) +{ + struct msgb *msg = common_tx_radio_status(bctx); + + if (!msg) + return -ENOMEM; + bssgp_msgb_tlli_put(msg, tlli); + LOGPC(DBSSGP, LOGL_NOTICE, "TLLI=0x%08x ", tlli); + + return common_tx_radio_status2(msg, cause); +} + +/*! \brief Transmit RADIO-STATUS for TMSI (10.3.5) */ +int bssgp_tx_radio_status_tmsi(struct bssgp_bvc_ctx *bctx, uint8_t cause, + uint32_t tmsi) +{ + struct msgb *msg = common_tx_radio_status(bctx); + uint32_t _tmsi = htonl(tmsi); + + if (!msg) + return -ENOMEM; + msgb_tvlv_put(msg, BSSGP_IE_TMSI, 4, (uint8_t *)&_tmsi); + LOGPC(DBSSGP, LOGL_NOTICE, "TMSI=0x%08x ", tmsi); + + return common_tx_radio_status2(msg, cause); +} + +/*! \brief Transmit RADIO-STATUS for IMSI (10.3.5) */ +int bssgp_tx_radio_status_imsi(struct bssgp_bvc_ctx *bctx, uint8_t cause, + const char *imsi) +{ + struct msgb *msg = common_tx_radio_status(bctx); + uint8_t mi[10]; + int imsi_len = gsm48_generate_mid_from_imsi(mi, imsi); + + if (!msg) + return -ENOMEM; + + /* strip the MI type and length values (2 bytes) */ + if (imsi_len > 2) + msgb_tvlv_put(msg, BSSGP_IE_IMSI, imsi_len-2, mi+2); + LOGPC(DBSSGP, LOGL_NOTICE, "IMSI=%s ", imsi); + + return common_tx_radio_status2(msg, cause); +} + +/*! \brief Transmit FLUSH-LL-ACK (Chapter 10.4.2) */ +int bssgp_tx_flush_ll_ack(struct bssgp_bvc_ctx *bctx, uint32_t tlli, + uint8_t action, uint16_t bvci_new, + uint32_t num_octets) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + uint16_t _bvci_new = htons(bvci_new); + uint32_t _oct_aff = htonl(num_octets & 0xFFFFFF); + + msgb_nsei(msg) = bctx->nsei; + msgb_bvci(msg) = 0; /* Signalling */ + bgph->pdu_type = BSSGP_PDUT_FLUSH_LL_ACK; + + bssgp_msgb_tlli_put(msg, tlli); + msgb_tvlv_put(msg, BSSGP_IE_FLUSH_ACTION, 1, &action); + if (action == 1) /* transferred */ + msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci_new); + msgb_tvlv_put(msg, BSSGP_IE_NUM_OCT_AFF, 3, (uint8_t *) &_oct_aff); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/*! \brief Transmit LLC-DISCARDED (Chapter 10.4.3) */ +int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, + uint8_t num_frames, uint32_t num_octets) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + uint16_t _bvci = htons(bctx->bvci); + uint32_t _oct_aff = htonl(num_octets & 0xFFFFFF); + + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP (BVCI=%u) Tx LLC-DISCARDED " + "TLLI=0x%04x, FRAMES=%u, OCTETS=%u\n", bctx->bvci, tlli, + num_frames, num_octets); + msgb_nsei(msg) = bctx->nsei; + msgb_bvci(msg) = 0; /* Signalling */ + bgph->pdu_type = BSSGP_PDUT_LLC_DISCARD; + + bssgp_msgb_tlli_put(msg, tlli); + + msgb_tvlv_put(msg, BSSGP_IE_LLC_FRAMES_DISCARDED, 1, &num_frames); + msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci); + msgb_tvlv_put(msg, BSSGP_IE_NUM_OCT_AFF, 3, (uint8_t *) &_oct_aff); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/*! \brief Transmit a BVC-BLOCK message (Chapter 10.4.8) */ +int bssgp_tx_bvc_block(struct bssgp_bvc_ctx *bctx, uint8_t cause) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + uint16_t _bvci = htons(bctx->bvci); + + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP (BVCI=%u) Tx BVC-BLOCK " + "CAUSE=%u\n", bctx->bvci, cause); + + msgb_nsei(msg) = bctx->nsei; + msgb_bvci(msg) = 0; /* Signalling */ + bgph->pdu_type = BSSGP_PDUT_BVC_BLOCK; + + msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci); + msgb_tvlv_put(msg, BSSGP_IE_CAUSE, 1, &cause); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/*! \brief Transmit a BVC-UNBLOCK message (Chapter 10.4.10) */ +int bssgp_tx_bvc_unblock(struct bssgp_bvc_ctx *bctx) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + uint16_t _bvci = htons(bctx->bvci); + + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP (BVCI=%u) Tx BVC-BLOCK\n", bctx->bvci); + + msgb_nsei(msg) = bctx->nsei; + msgb_bvci(msg) = 0; /* Signalling */ + bgph->pdu_type = BSSGP_PDUT_BVC_UNBLOCK; + + msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/*! \brief Transmit a BVC-RESET message (Chapter 10.4.12) */ +int bssgp_tx_bvc_reset(struct bssgp_bvc_ctx *bctx, uint16_t bvci, uint8_t cause) +{ + struct msgb *msg = bssgp_msgb_alloc(); + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); + uint16_t _bvci = htons(bvci); + + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP (BVCI=%u) Tx BVC-RESET " + "CAUSE=%u\n", bvci, cause); + + msgb_nsei(msg) = bctx->nsei; + msgb_bvci(msg) = 0; /* Signalling */ + bgph->pdu_type = BSSGP_PDUT_BVC_RESET; + + msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci); + msgb_tvlv_put(msg, BSSGP_IE_CAUSE, 1, &cause); + if (bvci != BVCI_PTM) { + uint8_t bssgp_cid[8]; + bssgp_create_cell_id(bssgp_cid, &bctx->ra_id, bctx->cell_id); + msgb_tvlv_put(msg, BSSGP_IE_CELL_ID, sizeof(bssgp_cid), bssgp_cid); + } + /* Optional: Feature Bitmap */ + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + + +/*! \brief RL-UL-UNITDATA.req (Chapter 10.2.2) */ +int bssgp_tx_ul_ud(struct bssgp_bvc_ctx *bctx, uint32_t tlli, + const uint8_t *qos_profile, struct msgb *llc_pdu) +{ + struct msgb *msg = llc_pdu; + uint8_t bssgp_cid[8]; + struct bssgp_ud_hdr *budh; + + /* FIXME: First push alignment octets, if rqd */ + + /* FIXME: Optional LSA Identifier List, PFI */ + + /* Cell Identifier */ + bssgp_create_cell_id(bssgp_cid, &bctx->ra_id, bctx->cell_id); + msgb_tvlv_push(msg, BSSGP_IE_CELL_ID, sizeof(bssgp_cid), bssgp_cid); + + /* User Data Header */ + budh = (struct bssgp_ud_hdr *) msgb_push(msg, sizeof(*budh)); + budh->tlli = htonl(tlli); + memcpy(budh->qos_profile, qos_profile, 3); + budh->pdu_type = BSSGP_PDUT_UL_UNITDATA; + + /* set NSEI and BVCI in msgb cb */ + msgb_nsei(msg) = bctx->nsei; + msgb_bvci(msg) = bctx->bvci; + + rate_ctr_inc(&bctx->ctrg->ctr[BSSGP_CTR_PKTS_OUT]); + rate_ctr_add(&bctx->ctrg->ctr[BSSGP_CTR_BYTES_OUT], msg->len); + + return gprs_ns_sendmsg(bssgp_nsi, msg); +} + +/* Parse a single GMM-PAGING.req to a given NSEI/NS-BVCI */ +int gprs_bssgp_rx_paging(struct bssgp_paging_info *pinfo, + struct msgb *msg) +{ + struct bssgp_normal_hdr *bgph = + (struct bssgp_normal_hdr *) msgb_bssgph(msg); + struct tlv_parsed tp; + uint8_t ra[6]; + int rc, data_len; + + memset(ra, 0, sizeof(ra)); + + data_len = msgb_bssgp_len(msg) - sizeof(*bgph); + rc = bssgp_tlv_parse(&tp, bgph->data, data_len); + if (rc < 0) + goto err_mand_ie; + + switch (bgph->pdu_type) { + case BSSGP_PDUT_PAGING_PS: + pinfo->mode = BSSGP_PAGING_PS; + break; + case BSSGP_PDUT_PAGING_CS: + pinfo->mode = BSSGP_PAGING_CS; + break; + default: + return -EINVAL; + } + + /* IMSI */ + if (!TLVP_PRESENT(&tp, BSSGP_IE_IMSI)) + goto err_mand_ie; + if (!pinfo->imsi) + pinfo->imsi = talloc_zero_size(pinfo, 16); + gsm48_mi_to_string(pinfo->imsi, sizeof(pinfo->imsi), + TLVP_VAL(&tp, BSSGP_IE_IMSI), + TLVP_LEN(&tp, BSSGP_IE_IMSI)); + + /* DRX Parameters */ + if (!TLVP_PRESENT(&tp, BSSGP_IE_DRX_PARAMS)) + goto err_mand_ie; + pinfo->drx_params = ntohs(*(uint16_t *)TLVP_VAL(&tp, BSSGP_IE_DRX_PARAMS)); + + /* Scope */ + if (TLVP_PRESENT(&tp, BSSGP_IE_BSS_AREA_ID)) { + pinfo->scope = BSSGP_PAGING_BSS_AREA; + } else if (TLVP_PRESENT(&tp, BSSGP_IE_LOCATION_AREA)) { + pinfo->scope = BSSGP_PAGING_LOCATION_AREA; + memcpy(ra, TLVP_VAL(&tp, BSSGP_IE_LOCATION_AREA), + TLVP_LEN(&tp, BSSGP_IE_LOCATION_AREA)); + gsm48_parse_ra(&pinfo->raid, ra); + } else if (TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) { + pinfo->scope = BSSGP_PAGING_ROUTEING_AREA; + memcpy(ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), + TLVP_LEN(&tp, BSSGP_IE_ROUTEING_AREA)); + gsm48_parse_ra(&pinfo->raid, ra); + } else if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { + pinfo->scope = BSSGP_PAGING_BVCI; + pinfo->bvci = ntohs(*(uint16_t *)TLVP_VAL(&tp, BSSGP_IE_BVCI)); + } else + return -EINVAL; + + /* QoS profile mandatory for PS */ + if (pinfo->mode == BSSGP_PAGING_PS) { + if (!TLVP_PRESENT(&tp, BSSGP_IE_QOS_PROFILE)) + goto err_cond_ie; + if (TLVP_LEN(&tp, BSSGP_IE_QOS_PROFILE) < 3) + goto err; + + memcpy(&pinfo->qos, TLVP_VAL(&tp, BSSGP_IE_QOS_PROFILE), + 3); + } + + /* Optional (P-)TMSI */ + if (TLVP_PRESENT(&tp, BSSGP_IE_TMSI) && + TLVP_LEN(&tp, BSSGP_IE_TMSI) >= 4) + if (!pinfo->ptmsi) + pinfo->ptmsi = talloc_zero_size(pinfo, sizeof(uint32_t)); + *(pinfo->ptmsi) = ntohl(*(uint32_t *) + TLVP_VAL(&tp, BSSGP_IE_TMSI)); + + return 0; + +err_mand_ie: +err_cond_ie: +err: + /* FIXME */ + return 0; +} |