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Create new 'gprs-sgsn' branch on top of 'gprs-conf' 

This branch contains the partial SGSN/GGSN implementation that
was originally developed as part of the gprs branch.
This commit is contained in:
Harald Welte 2010-03-14 15:45:01 +08:00
parent 3c69a4cdbe
commit 9b455bf801
16 changed files with 2690 additions and 12 deletions
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8
openbsc/include/openbsc/crc24.h Normal file
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#ifndef _CRC24_H
#define _CRC24_H
#define INIT_CRC24 0xffffff
u_int32_t crc24_calc(u_int32_t fcs, u_int8_t *cp, unsigned int len);
#endif

1
openbsc/include/openbsc/debug.h
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@ -29,6 +29,7 @@ enum {
DHO,
DDB,
DREF,
DGPRS,
Debug_LastEntry,
};

138
openbsc/include/openbsc/gprs_bssgp.h Normal file
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#ifndef _GPRS_BSSGP_H
#define _GPRS_BSSGP_H
/* Section 11.3.26 / Table 11.27 */
enum bssgp_pdu_type {
/* PDUs between RL and BSSGP SAPs */
BSSGP_PDUT_DL_UNITDATA = 0x00,
BSSGP_PDUT_UL_UNITDATA = 0x01,
BSSGP_PDUT_RA_CAPABILITY = 0x02,
BSSGP_PDUT_PTM_UNITDATA = 0x03,
/* PDUs between GMM SAPs */
BSSGP_PDUT_PAGING_PS = 0x06,
BSSGP_PDUT_PAGING_CS = 0x07,
BSSGP_PDUT_RA_CAPA_UDPATE = 0x08,
BSSGP_PDUT_RA_CAPA_UPDATE_ACK = 0x09,
BSSGP_PDUT_RADIO_STATUS = 0x0a,
BSSGP_PDUT_SUSPEND = 0x0b,
BSSGP_PDUT_SUSPEND_ACK = 0x0c,
BSSGP_PDUT_SUSPEND_NACK = 0x0d,
BSSGP_PDUT_RESUME = 0x0e,
BSSGP_PDUT_RESUME_ACK = 0x0f,
BSSGP_PDUT_RESUME_NACK = 0x10,
/* PDus between NM SAPs */
BSSGP_PDUT_BVC_BLOCK = 0x20,
BSSGP_PDUT_BVC_BLOCK_ACK = 0x21,
BSSGP_PDUT_BVC_RESET = 0x22,
BSSGP_PDUT_BVC_RESET_ACK = 0x23,
BSSGP_PDUT_BVC_UNBLOCK = 0x24,
BSSGP_PDUT_BVC_UNBLOCK_ACK = 0x25,
BSSGP_PDUT_FLOW_CONTROL_BVC = 0x26,
BSSGP_PDUT_FLOW_CONTROL_BVC_ACK = 0x27,
BSSGP_PDUT_FLOW_CONTROL_MS = 0x28,
BSSGP_PDUT_FLOW_CONTROL_MS_ACK = 0x29,
BSSGP_PDUT_FLUSH_LL = 0x2a,
BSSGP_PDUT_FLUSH_LL_ACK = 0x2b,
BSSGP_PDUT_LLC_DISCARD = 0x2c,
BSSGP_PDUT_SGSN_INVOKE_TRACE = 0x40,
BSSGP_PDUT_STATUS = 0x41,
/* PDUs between PFM SAP's */
BSSGP_PDUT_DOWNLOAD_BSS_PFC = 0x50,
BSSGP_PDUT_CREATE_BSS_PFC = 0x51,
BSSGP_PDUT_CREATE_BSS_PFC_ACK = 0x52,
BSSGP_PDUT_CREATE_BSS_PFC_NACK = 0x53,
BSSGP_PDUT_MODIFY_BSS_PFC = 0x54,
BSSGP_PDUT_MODIFY_BSS_PFC_ACK = 0x55,
BSSGP_PDUT_DELETE_BSS_PFC = 0x56,
BSSGP_PDUT_DELETE_BSS_PFC_ACK = 0x57,
};
/* Section 10.2.1 and 10.2.2 */
struct bssgp_ud_hdr {
u_int8_t pdu_type;
u_int32_t tlli;
u_int8_t qos_profile[3];
u_int8_t data[0]; /* TLV's */
} __attribute__((packed));
struct bssgp_normal_hdr {
u_int8_t pdu_type;
u_int8_t data[0]; /* TLV's */
};
enum bssgp_iei_type {
BSSGP_IE_ALIGNMENT = 0x00,
BSSGP_IE_BMAX_DEFAULT_MS = 0x01,
BSSGP_IE_BSS_AREA_ID = 0x02,
BSSGP_IE_BUCKET_LEAK_RATE = 0x03,
BSSGP_IE_BVCI = 0x04,
BSSGP_IE_BVC_BUCKET_SIZE = 0x05,
BSSGP_IE_BVC_MEASUREMENT = 0x06,
BSSGP_IE_CAUSE = 0x07,
BSSGP_IE_CELL_ID = 0x08,
BSSGP_IE_CHAN_NEEDED = 0x09,
BSSGP_IE_DRX_PARAMS = 0x0a,
BSSGP_IE_EMLPP_PRIO = 0x0b,
BSSGP_IE_FLUSH_ACTION = 0x0c,
BSSGP_IE_IMSI = 0x0d,
BSSGP_IE_LLC_PDU = 0x0e,
BSSGP_IE_LLC_FRAMES_DISCARDED = 0x0f,
BSSGP_IE_LOCATION_AREA = 0x10,
BSSGP_IE_MOBILE_ID = 0x11,
BSSGP_IE_MS_BUCKET_SIZE = 0x12,
BSSGP_IE_MS_RADIO_ACCESS_CAP = 0x13,
BSSGP_IE_OMC_ID = 0x14,
BSSGP_IE_PDU_IN_ERROR = 0x15,
BSSGP_IE_PDU_LIFETIME = 0x16,
BSSGP_IE_PRIORITY = 0x17,
BSSGP_IE_QOS_PROFILE = 0x18,
BSSGP_IE_RADIO_CAUSE = 0x19,
BSSGP_IE_RA_CAP_UPD_CAUSE = 0x1a,
BSSGP_IE_ROUTEING_AREA = 0x1b,
BSSGP_IE_R_DEFAULT_MS = 0x1c,
BSSGP_IE_SUSPEND_REF_NR = 0x1d,
BSSGP_IE_TAG = 0x1e,
BSSGP_IE_TLLI = 0x1f,
BSSGP_IE_TMSI = 0x20,
BSSGP_IE_TRACE_REFERENC = 0x21,
BSSGP_IE_TRACE_TYPE = 0x22,
BSSGP_IE_TRANSACTION_ID = 0x23,
BSSGP_IE_TRIGGER_ID = 0x24,
BSSGP_IE_NUM_OCT_AFF = 0x25,
BSSGP_IE_LSA_ID_LIST = 0x26,
BSSGP_IE_LSA_INFORMATION = 0x27,
BSSGP_IE_PACKET_FLOW_ID = 0x28,
BSSGP_IE_PACKET_FLOW_TIMER = 0x29,
BSSGP_IE_AGG_BSS_QOS_PROFILE = 0x3a,
BSSGP_IE_FEATURE_BITMAP = 0x3b,
BSSGP_IE_BUCKET_FULL_RATIO = 0x3c,
BSSGP_IE_SERVICE_UTRAN_CCO = 0x3d,
};
/* Section 11.3.8 / Table 11.10: Cause coding */
enum gprs_bssgp_cause {
BSSGP_CAUSE_PROC_OVERLOAD = 0x00,
BSSGP_CAUSE_EQUIP_FAIL = 0x01,
BSSGP_CAUSE_TRASIT_NET_FAIL = 0x02,
BSSGP_CAUSE_CAPA_GREATER_0KPBS = 0x03,
BSSGP_CAUSE_UNKNOWN_MS = 0x04,
BSSGP_CAUSE_UNKNOWN_BVCI = 0x05,
BSSGP_CAUSE_CELL_TRAF_CONG = 0x06,
BSSGP_CAUSE_SGSN_CONG = 0x07,
BSSGP_CAUSE_OML_INTERV = 0x08,
BSSGP_CAUSE_BVCI_BLOCKED = 0x09,
BSSGP_CAUSE_PFC_CREATE_FAIL = 0x0a,
BSSGP_CAUSE_SEM_INCORR_PDU = 0x20,
BSSGP_CAUSE_INV_MAND_INF = 0x21,
BSSGP_CAUSE_MISSING_MAND_IE = 0x22,
BSSGP_CAUSE_MISSING_COND_IE = 0x23,
BSSGP_CAUSE_UNEXP_COND_IE = 0x24,
BSSGP_CAUSE_COND_IE_ERR = 0x25,
BSSGP_CAUSE_PDU_INCOMP_STATE = 0x26,
BSSGP_CAUSE_PROTO_ERR_UNSPEC = 0x27,
BSSGP_CAUSE_PDU_INCOMP_FEAT = 0x28,
};
extern int gprs_bssgp_rcvmsg(struct msgb *msg, u_int16_t bvci);
#endif /* _GPRS_BSSGP_H */

20
openbsc/include/openbsc/gprs_llc.h Normal file
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#ifndef _GPRS_LLC_H
#define _GPRS_LLC_H
/* Section 4.7 LLC Layer Structure */
enum gprs_llc_sapi {
GPRS_SAPI_GMM = 1,
GPRS_SAPI_TOM2 = 2,
GPRS_SAPI_SNDCP3 = 3,
GPRS_SAPI_SNDCP5 = 5,
GPRS_SAPI_SMS = 7,
GPRS_SAPI_TOM8 = 8,
GPRS_SAPI_SNDCP9 = 9,
GPRS_SAPI_SNDCP11 = 11,
};
int gprs_llc_rcvmsg(struct msgb *msg, struct tlv_parsed *tv);
int gprs_llc_tx_ui(struct msgb *msg, u_int8_t sapi, int command);
#endif

61
openbsc/include/openbsc/gprs_ns.h Normal file
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#ifndef _GPRS_NS_H
#define _GPRS_NS_H
struct gprs_ns_hdr {
u_int8_t pdu_type;
u_int8_t data[0];
} __attribute__((packed));
/* TS 08.16, Section 10.3.7, Table 14 */
enum ns_pdu_type {
NS_PDUT_UNITDATA = 0x00,
NS_PDUT_RESET = 0x02,
NS_PDUT_RESET_ACK = 0x03,
NS_PDUT_BLOCK = 0x04,
NS_PDUT_BLOCK_ACK = 0x05,
NS_PDUT_UNBLOCK = 0x06,
NS_PDUT_UNBLOCK_ACK = 0x07,
NS_PDUT_STATUS = 0x08,
NS_PDUT_ALIVE = 0x0a,
NS_PDUT_ALIVE_ACK = 0x0b,
};
/* TS 08.16, Section 10.3, Table 12 */
enum ns_ctrl_ie {
NS_IE_CAUSE = 0x00,
NS_IE_VCI = 0x01,
NS_IE_PDU = 0x02,
NS_IE_BVCI = 0x03,
NS_IE_NSEI = 0x04,
};
/* TS 08.16, Section 10.3.2, Table 13 */
enum ns_cause {
NS_CAUSE_TRANSIT_FAIL = 0x00,
NS_CAUSE_OM_INTERVENTION = 0x01,
NS_CAUSE_EQUIP_FAIL = 0x02,
NS_CAUSE_NSVC_BLOCKED = 0x03,
NS_CAUSE_NSVC_UNKNOWN = 0x04,
NS_CAUSE_BVCI_UNKNOWN = 0x05,
NS_CAUSE_SEM_INCORR_PDU = 0x08,
NS_CAUSE_PDU_INCOMP_PSTATE = 0x0a,
NS_CAUSE_PROTO_ERR_UNSPEC = 0x0b,
NS_CAUSE_INVAL_ESSENT_IE = 0x0c,
NS_CAUSE_MISSING_ESSENT_IE = 0x0d,
};
/* a layer 1 entity transporting NS frames */
struct gprs_ns_link {
union {
struct {
int fd;
} ip;
};
};
int gprs_ns_rcvmsg(struct msgb *msg);
int gprs_ns_sendmsg(struct gprs_ns_link *link, u_int16_t bvci,
struct msgb *msg);
#endif

107
openbsc/include/openbsc/gprs_sgsn.h Normal file
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#ifndef _GPRS_SGSN_H
#define _GPRS_SGSN_H
/* TS 04.08 4.1.3.3 GMM mobility management states on the network side */
enum gprs_mm_state {
GMM_DEREGISTERED, /* 4.1.3.3.1.1 */
GMM_COMMON_PROC_INIT, /* 4.1.3.3.1.2 */
GMM_REGISTERED_NORMAL, /* 4.1.3.3.2.1 */
GMM_REGISTERED_SUSPENDED, /* 4.1.3.3.2.2 */
GMM_DEREGISTERED_INIT, /* 4.1.3.3.1.4 */
};
enum gprs_ciph_algo {
GPRS_ALGO_GEA0,
GPRS_ALGO_GEA1,
GPRS_ALGO_GEA2,
};
#define MS_RADIO_ACCESS_CAPA
/* According to TS 03.60, Table 5: SGSN MM and PDP Contexts */
struct sgsn_mm_ctx {
struct llist_head list;
char imsi[GSM_IMSI_LENGTH];
enum gprs_mm_state mm_state;
u_int32_t p_tmsi;
u_int32_t p_tmsi_sig;
char imei[GSM_IMEI_LENGTH];
char msisdn[GSM_EXTENSION_LENGTH];
struct gprs_ra_id ra;
u_int16_t cell_id;
u_int32_t cell_id_age;
/* VLR number */
u_int32_t new_sgsn_addr;
/* Authentication Triplets */
/* Kc */
/* CKSN */
enum gprs_ciph_algo ciph_algo;
struct {
u_int8_t buf[14]; /* 10.5.5.12a */
u_int8_t len;
} ms_radio_access_capa;
struct {
u_int8_t buf[4]; /* 10.5.5.12 */
u_int8_t len;
} ms_network_capa;
u_int16_t drx_parms;
int mnrg; /* MS reported to HLR? */
int ngaf; /* MS reported to MSC/VLR? */
int ppf; /* paging for GPRS + non-GPRS? */
/* SMS Parameters */
int recovery;
u_int8_t radio_prio_sms;
struct llist_head pdp_list;
/* Additional bits not present in the GSM TS */
u_int32_t tlli;
struct timer_list timer;
unsigned int T;
};
enum pdp_ctx_state {
PDP_STAE_NONE,
};
enum pdp_type {
PDP_TYPE_NONE,
};
struct sgsn_pdp_ctx {
struct llist_head list;
unsigned int id;
enum pdp_ctx_state state;
enum pdp_type type;
u_int32_t addresss;
char *apn_subscribed;
char *apn_used;
u_int16_t nsapi;
u_int8_t ti; /* transaction identifier */
u_int32_t ggsn_in_use;
int vplmn_allowed;
u_int32_t qos_profile_subscr;
u_int32_t qos_profile_req;
u_int32_t qos_profile_neg;
u_int8_t radio_prio;
u_int32_t tx_npdu_nr;
u_int32_t rx_npdu_nr;
u_int32_t tx_gtp_snd;
u_int32_t rx_gtp_snu;
u_int32_t charging_id;
int reordering_reqd;
};
/* look-up a SGSN MM context based on TLLI + RAI */
struct sgsn_mm_ctx *sgsn_mm_ctx_by_tlli(u_int32_t tlli,
const struct gprs_ra_id *raid);
struct sgsn_mm_ctx *sgsn_mm_ctx_by_ptmsi(u_int32_t tmsi);
struct sgsn_mm_ctx *sgsn_mm_ctx_by_imsi(const char *imsi);
/* Allocate a new SGSN MM context */
struct sgsn_mm_ctx *sgsn_mm_ctx_alloc(u_int32_t tlli,
const struct gprs_ra_id *raid);
#endif /* _GPRS_SGSN_H */

203
openbsc/include/openbsc/gsm_04_08_gprs.h Normal file
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#ifndef _GSM48_GPRS_H
#define _GSM48_GPRS_H
/* Table 10.4 / 10.4a, GPRS Mobility Management (GMM) */
#define GSM48_MT_GMM_ATTACH_REQ 0x01
#define GSM48_MT_GMM_ATTACH_ACK 0x02
#define GSM48_MT_GMM_ATTACH_COMPL 0x03
#define GSM48_MT_GMM_ATTACH_REJ 0x04
#define GSM48_MT_GMM_DETACH_REQ 0x05
#define GSM48_MT_GMM_DETACH_ACK 0x06
#define GSM48_MT_GMM_RA_UPD_REQ 0x08
#define GSM48_MT_GMM_RA_UPD_ACK 0x09
#define GSM48_MT_GMM_RA_UPD_COMPL 0x0a
#define GSM48_MT_GMM_RA_UPD_REJ 0x0b
#define GSM48_MT_GMM_PTMSI_REALL_CMD 0x10
#define GSM48_MT_GMM_PTMSI_REALL_COMPL 0x11
#define GSM48_MT_GMM_AUTH_CIPH_REQ 0x12
#define GSM48_MT_GMM_AUTH_CIPH_RESP 0x13
#define GSM48_MT_GMM_AUTH_CIPH_REJ 0x14
#define GSM48_MT_GMM_ID_REQ 0x15
#define GSM48_MT_GMM_ID_RESP 0x16
#define GSM48_MT_GMM_STATUS 0x20
#define GSM48_MT_GMM_INFO 0x21
/* Table 10.4a, GPRS Session Management (GSM) */
#define GSM48_MT_GSM_ACT_PDP_REQ 0x41
#define GSM48_MT_GSM_ACT_PDP_ACK 0x42
#define GSM48_MT_GSM_ACT_PDP_REJ 0x43
#define GSM48_MT_GSM_REQ_PDP_ACT 0x44
#define GSM48_MT_GSM_REQ_PDP_ACT_REJ 0x45
#define GSM48_MT_GSM_DEACT_PDP_REQ 0x46
#define GSM48_MT_GSM_DEACT_PDP_ACK 0x47
#define GSM48_MT_GSM_ACT_AA_PDP_REQ 0x50
#define GSM48_MT_GSM_ACT_AA_PDP_ACK 0x51
#define GSM48_MT_GSM_ACT_AA_PDP_REJ 0x52
#define GSM48_MT_GSM_DEACT_AA_PDP_REQ 0x53
#define GSM48_MT_GSM_DEACT_AA_PDP_ACK 0x54
#define GSM48_MT_GSM_STATUS 0x55
/* Chapter 10.5.5.2 / Table 10.5.135 */
#define GPRS_ATT_T_ATTACH 1
#define GPRS_ATT_T_ATT_WHILE_IMSI 2
#define GPRS_ATT_T_COMBINED 3
/* Chapter 10.5.5.18 / Table 105.150 */
#define GPRS_UPD_T_RA 0
#define GPRS_UPD_T_RA_LA 1
#define GPRS_UPD_T_RA_LA_IMSI_ATT 2
#define GPRS_UPD_T_PERIODIC 3
enum gsm48_gprs_ie_mm {
GSM48_IE_GMM_TIMER_READY = 0x17, /* 10.5.7.3 */
GSM48_IE_GMM_PTMSI_SIG = 0x19, /* 10.5.5.8 */
GSM48_IE_GMM_AUTH_RAND = 0x21, /* 10.5.3.1 */
GSM48_IE_GMM_AUTH_SRES = 0x22, /* 10.5.3.2 */
GSM48_IE_GMM_IMEISV = 0x23, /* 10.5.1.4 */
GSM48_IE_GMM_DRX_PARAM = 0x27, /* 10.5.5.6 */
GSM48_IE_GMM_MS_NET_CAPA = 0x31, /* 10.5.5.12 */
};
enum gsm48_gprs_ie_sm {
GSM48_IE_GSM_APN = 0x28, /* 10.5.6.1 */
GSM48_IE_GSM_PROTO_CONF_OPT = 0x27, /* 10.5.6.3 */
GSM48_IE_GSM_PDP_ADDR = 0x2b, /* 10.5.6.4 */
GSM48_IE_GSM_AA_TMR = 0x29, /* 10.5.7.3 */
GSM48_IE_GSM_NAME_FULL = 0x43, /* 10.5.3.5a */
GSM48_IE_GSM_NAME_SHORT = 0x45, /* 10.5.3.5a */
GSM48_IE_GSM_TIMEZONE = 0x46, /* 10.5.3.8 */
GSM48_IE_GSM_UTC_AND_TZ = 0x47, /* 10.5.3.9 */
GSM48_IE_GSM_LSA_ID = 0x48, /* 10.5.3.11 */
};
/* Chapter 10.4.4.15 */
struct gsm48_ra_id {
u_int8_t digits[3]; /* MCC + MNC BCD digits */
u_int16_t lac; /* Location Area Code */
u_int8_t rac; /* Routing Area Code */
} __attribute__ ((packed));
/* Chapter 9.4.15 / Table 9.4.15 */
struct gsm48_ra_upd_ack {
u_int8_t force_stby:4, /* 10.5.5.7 */
upd_result:4; /* 10.5.5.17 */
u_int8_t ra_upd_timer; /* 10.5.7.3 */
struct gsm48_ra_id ra_id; /* 10.5.5.15 */
u_int8_t data[0];
} __attribute__((packed));
/* Chapter 10.5.7.3 */
enum gsm48_gprs_tmr_unit {
GPRS_TMR_2SECONDS = 0 << 5,
GPRS_TMR_MINUTE = 1 << 5,
GPRS_TMR_6MINUTE = 2 << 5,
GPRS_TMR_DEACTIVATED = 3 << 5,
};
/* Chapter 9.4.2 / Table 9.4.2 */
struct gsm48_attach_ack {
u_int8_t att_result:4, /* 10.5.5.7 */
force_stby:4; /* 10.5.5.1 */
u_int8_t ra_upd_timer; /* 10.5.7.3 */
u_int8_t radio_prio; /* 10.5.7.2 */
struct gsm48_ra_id ra_id; /* 10.5.5.15 */
u_int8_t data[0];
} __attribute__((packed));
/* Chapter 9.5.1 / Table 9.5.1 */
struct gsm48_act_pdp_ctx_req {
u_int8_t req_nsapi;
u_int8_t req_llc_sapi;
u_int8_t req_qos_lv[4];
u_int8_t data[0];
} __attribute__((packed));
/* Chapter 9.5.2 / Table 9.5.2 */
struct gsm48_act_pdp_ctx_ack {
u_int8_t llc_sapi;
u_int8_t qos_lv[4];
u_int8_t radio_prio:4,
spare:4;
u_int8_t data[0];
} __attribute__((packed));
/* Chapter 10.5.5.14 / Table 10.5.147 */
enum gsm48_gmm_cause {
GMM_CAUSE_IMSI_UNKNOWN = 0x02,
GMM_CAUSE_ILLEGAL_MS = 0x03,
GMM_CAUSE_ILLEGAL_ME = 0x06,
GMM_CAUSE_GPRS_NOTALLOWED = 0x07,
GMM_CAUSE_GPRS_OTHER_NOTALLOWED = 0x08,
GMM_CAUSE_MS_ID_NOT_DERIVED = 0x09,
GMM_CAUSE_IMPL_DETACHED = 0x0a,
GMM_CAUSE_PLMN_NOTALLOWED = 0x0b,
GMM_CAUSE_LA_NOTALLOWED = 0x0c,
GMM_CAUSE_ROAMING_NOTALLOWED = 0x0d,
GMM_CAUSE_NO_GPRS_PLMN = 0x0e,
GMM_CAUSE_MSC_TEMP_NOTREACH = 0x10,
GMM_CAUSE_NET_FAIL = 0x11,
GMM_CAUSE_CONGESTION = 0x16,
GMM_CAUSE_SEM_INCORR_MSG = 0x5f,
GMM_CAUSE_INV_MAND_INFO = 0x60,
GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL = 0x61,
GMM_CAUSE_MSGT_INCOMP_P_STATE = 0x62,
GMM_CAUSE_IE_NOTEXIST_NOTIMPL = 0x63,
GMM_CAUSE_COND_IE_ERR = 0x64,
GMM_CAUSE_MSG_INCOMP_P_STATE = 0x65,
GMM_CAUSE_PROTO_ERR_UNSPEC = 0x6f,
};
/* Chapter 10.4.6.6 / Table 10.5.157 */
enum gsm48_gsm_cause {
GSM_CAUSE_INSUFF_RSRC = 0x1a,
GSM_CAUSE_MISSING_APN = 0x1b,
GSM_CAUSE_UNKNOWN_PDP = 0x1c,
GSM_CAUSE_AUTH_FAILED = 0x1d,
GSM_CAUSE_ACT_REJ_GGSN = 0x1e,
GSM_CAUSE_ACT_REJ_UNSPEC = 0x1f,
GSM_CAUSE_SERV_OPT_NOTSUPP = 0x20,
GSM_CAUSE_REQ_SERV_OPT_NOTSUB = 0x21,
GSM_CAUSE_SERV_OPT_TEMP_OOO = 0x22,
GSM_CAUSE_NSAPI_IN_USE = 0x23,
GSM_CAUSE_DEACT_REGULAR = 0x24,
GSM_CAUSE_QOS_NOT_ACCEPTED = 0x25,
GSM_CAUSE_NET_FAIL = 0x26,
GSM_CAUSE_REACT_RQD = 0x27,
GSM_CAUSE_FEATURE_NOTSUPP = 0x28,
GSM_CAUSE_INVALID_TRANS_ID = 0x51,
GSM_CAUSE_SEM_INCORR_MSG = 0x5f,
GSM_CAUSE_INV_MAND_INFO = 0x60,
GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL = 0x61,
GSM_CAUSE_MSGT_INCOMP_P_STATE = 0x62,
GSM_CAUSE_IE_NOTEXIST_NOTIMPL = 0x63,
GSM_CAUSE_COND_IE_ERR = 0x64,
GSM_CAUSE_MSG_INCOMP_P_STATE = 0x65,
GSM_CAUSE_PROTO_ERR_UNSPEC = 0x6f,
};
/* GSM TS 03.03 Chapter 2.6 */
enum gprs_tlli_tyoe {
TLLI_LOCAL,
TLLI_FOREIGN,
TLLI_RANDOM,
TLLI_AUXILIARY,
TLLI_RESERVED,
};
/* Section 6.1.2.2: Session management states on the network side */
enum gsm48_pdp_state {
PDP_S_INACTIVE,
PDP_S_ACTIVE_PENDING,
PDP_S_ACTIVE,
PDP_S_INACTIVE_PENDING,
PDP_S_MODIFY_PENDING,
};
int gprs_tlli_type(u_int32_t tlli);
struct gsm_bts *gsm48_bts_by_ra_id(struct gsm_network *net,
const u_int8_t *buf, unsigned int len);
#endif /* _GSM48_GPRS_H */

7
openbsc/src/Makefile.am
View File

@ -4,7 +4,7 @@ AM_LDFLAGS = $(LIBOSMOCORE_LIBS)
sbin_PROGRAMS = bsc_hack bs11_config ipaccess-find ipaccess-config \
isdnsync bsc_mgcp ipaccess-proxy
noinst_LIBRARIES = libbsc.a libmsc.a libvty.a
noinst_LIBRARIES = libbsc.a libmsc.a libvty.a libsccp.a libsgsn.a
noinst_HEADERS = vty/cardshell.h
bscdir = $(libdir)
@ -19,6 +19,9 @@ libbsc_a_SOURCES = abis_rsl.c abis_nm.c gsm_data.c gsm_04_08_utils.c \
rtp_proxy.c bts_siemens_bs11.c bts_ipaccess_nanobts.c \
bts_unknown.c bsc_version.c bsc_api.c
libsgsn_a_SOURCES = gprs_ns.c gprs_bssgp.c gprs_llc.c gsm_04_08_gprs.c \
crc24.c gprs_sgsn.c
libmsc_a_SOURCES = gsm_subscriber.c db.c \
mncc.c gsm_04_08.c gsm_04_11.c transaction.c \
token_auth.c rrlp.c gsm_04_80.c ussd.c silent_call.c \
@ -30,7 +33,7 @@ libvty_a_SOURCES = vty/buffer.c vty/command.c vty/vector.c vty/vty.c \
libsccp_a_SOURCES = sccp/sccp.c
bsc_hack_SOURCES = bsc_hack.c bsc_init.c vty_interface.c vty_interface_layer3.c
bsc_hack_LDADD = libmsc.a libbsc.a libmsc.a libvty.a -ldl -ldbi $(LIBCRYPT)
bsc_hack_LDADD = libmsc.a libbsc.a libmsc.a libsgsn.a libvty.a -ldl -ldbi $(LIBCRYPT)
bs11_config_SOURCES = bs11_config.c abis_nm.c gsm_data.c debug.c \
rs232.c bts_siemens_bs11.c

69
openbsc/src/crc24.c Normal file
View File

@ -0,0 +1,69 @@
/* GPRS LLC CRC-24 Implementation */
/* (C) 2008-2009 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <sys/types.h>
#include <openbsc/crc24.h>
/* CRC24 table - FCS */
static const u_int32_t tbl_crc24[256] = {
0x00000000, 0x00d6a776, 0x00f64557, 0x0020e221, 0x00b78115, 0x00612663, 0x0041c442, 0x00976334,
0x00340991, 0x00e2aee7, 0x00c24cc6, 0x0014ebb0, 0x00838884, 0x00552ff2, 0x0075cdd3, 0x00a36aa5,
0x00681322, 0x00beb454, 0x009e5675, 0x0048f103, 0x00df9237, 0x00093541, 0x0029d760, 0x00ff7016,
0x005c1ab3, 0x008abdc5, 0x00aa5fe4, 0x007cf892, 0x00eb9ba6, 0x003d3cd0, 0x001ddef1, 0x00cb7987,
0x00d02644, 0x00068132, 0x00266313, 0x00f0c465, 0x0067a751, 0x00b10027, 0x0091e206, 0x00474570,
0x00e42fd5, 0x003288a3, 0x00126a82, 0x00c4cdf4, 0x0053aec0, 0x008509b6, 0x00a5eb97, 0x00734ce1,
0x00b83566, 0x006e9210, 0x004e7031, 0x0098d747, 0x000fb473, 0x00d91305, 0x00f9f124, 0x002f5652,
0x008c3cf7, 0x005a9b81, 0x007a79a0, 0x00acded6, 0x003bbde2, 0x00ed1a94, 0x00cdf8b5, 0x001b5fc3,
0x00fb4733, 0x002de045, 0x000d0264, 0x00dba512, 0x004cc626, 0x009a6150, 0x00ba8371, 0x006c2407,
0x00cf4ea2, 0x0019e9d4, 0x00390bf5, 0x00efac83, 0x0078cfb7, 0x00ae68c1, 0x008e8ae0, 0x00582d96,
0x00935411, 0x0045f367, 0x00651146, 0x00b3b630, 0x0024d504, 0x00f27272, 0x00d29053, 0x00043725,
0x00a75d80, 0x0071faf6, 0x005118d7, 0x0087bfa1, 0x0010dc95, 0x00c67be3, 0x00e699c2, 0x00303eb4,
0x002b6177, 0x00fdc601, 0x00dd2420, 0x000b8356, 0x009ce062, 0x004a4714, 0x006aa535, 0x00bc0243,
0x001f68e6, 0x00c9cf90, 0x00e92db1, 0x003f8ac7, 0x00a8e9f3, 0x007e4e85, 0x005eaca4, 0x00880bd2,
0x00437255, 0x0095d523, 0x00b53702, 0x00639074, 0x00f4f340, 0x00225436, 0x0002b617, 0x00d41161,
0x00777bc4, 0x00a1dcb2, 0x00813e93, 0x005799e5, 0x00c0fad1, 0x00165da7, 0x0036bf86, 0x00e018f0,
0x00ad85dd, 0x007b22ab, 0x005bc08a, 0x008d67fc, 0x001a04c8, 0x00cca3be, 0x00ec419f, 0x003ae6e9,
0x00998c4c, 0x004f2b3a, 0x006fc91b, 0x00b96e6d, 0x002e0d59, 0x00f8aa2f, 0x00d8480e, 0x000eef78,
0x00c596ff, 0x00133189, 0x0033d3a8, 0x00e574de, 0x007217ea, 0x00a4b09c, 0x008452bd, 0x0052f5cb,
0x00f19f6e, 0x00273818, 0x0007da39, 0x00d17d4f, 0x00461e7b, 0x0090b90d, 0x00b05b2c, 0x0066fc5a,
0x007da399, 0x00ab04ef, 0x008be6ce, 0x005d41b8, 0x00ca228c, 0x001c85fa, 0x003c67db, 0x00eac0ad,
0x0049aa08, 0x009f0d7e, 0x00bfef5f, 0x00694829, 0x00fe2b1d, 0x00288c6b, 0x00086e4a, 0x00dec93c,
0x0015b0bb, 0x00c317cd, 0x00e3f5ec, 0x0035529a, 0x00a231ae, 0x007496d8, 0x005474f9, 0x0082d38f,
0x0021b92a, 0x00f71e5c, 0x00d7fc7d, 0x00015b0b, 0x0096383f, 0x00409f49, 0x00607d68, 0x00b6da1e,
0x0056c2ee, 0x00806598, 0x00a087b9, 0x007620cf, 0x00e143fb, 0x0037e48d, 0x001706ac, 0x00c1a1da,
0x0062cb7f, 0x00b46c09, 0x00948e28, 0x0042295e, 0x00d54a6a, 0x0003ed1c, 0x00230f3d, 0x00f5a84b,
0x003ed1cc, 0x00e876ba, 0x00c8949b, 0x001e33ed, 0x008950d9, 0x005ff7af, 0x007f158e, 0x00a9b2f8,
0x000ad85d, 0x00dc7f2b, 0x00fc9d0a, 0x002a3a7c, 0x00bd5948, 0x006bfe3e, 0x004b1c1f, 0x009dbb69,
0x0086e4aa, 0x005043dc, 0x0070a1fd, 0x00a6068b, 0x003165bf, 0x00e7c2c9, 0x00c720e8, 0x0011879e,
0x00b2ed3b, 0x00644a4d, 0x0044a86c, 0x00920f1a, 0x00056c2e, 0x00d3cb58, 0x00f32979, 0x00258e0f,
0x00eef788, 0x003850fe, 0x0018b2df, 0x00ce15a9, 0x0059769d, 0x008fd1eb, 0x00af33ca, 0x007994bc,
0x00dafe19, 0x000c596f, 0x002cbb4e, 0x00fa1c38, 0x006d7f0c, 0x00bbd87a, 0x009b3a5b, 0x004d9d2d
};
#define INIT_CRC24 0xffffff
u_int32_t crc24_calc(u_int32_t fcs, u_int8_t *cp, unsigned int len)
{
while (len--)
fcs = (fcs >> 8) ^ tbl_crc24[(fcs ^ *cp++) & 0xff];
return fcs;
}

397
openbsc/src/gprs_bssgp.c Normal file
View File

@ -0,0 +1,397 @@
/* GPRS BSSGP protocol implementation as per 3GPP TS 08.18 */
/* (C) 2009 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <errno.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <osmocore/msgb.h>
#include <osmocore/tlv.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/gsm_04_08_gprs.h>
#include <openbsc/gprs_bssgp.h>
#include <openbsc/gprs_llc.h>
#include <openbsc/gprs_ns.h>
/* global pointer to the gsm network data structure */
/* FIXME: this must go! */
extern struct gsm_network *bsc_gsmnet;
/* Chapter 11.3.9 / Table 11.10: Cause coding */
static const char *bssgp_cause_strings[] = {
[BSSGP_CAUSE_PROC_OVERLOAD] = "Processor overload",
[BSSGP_CAUSE_EQUIP_FAIL] = "Equipment Failure",
[BSSGP_CAUSE_TRASIT_NET_FAIL] = "Transit netowkr service failure",
[BSSGP_CAUSE_CAPA_GREATER_0KPBS]= "Transmission capacity modified",
[BSSGP_CAUSE_UNKNOWN_MS] = "Unknown MS",
[BSSGP_CAUSE_UNKNOWN_BVCI] = "Unknown BVCI",
[BSSGP_CAUSE_CELL_TRAF_CONG] = "Cell traffic congestion",
[BSSGP_CAUSE_SGSN_CONG] = "SGSN congestion",
[BSSGP_CAUSE_OML_INTERV] = "O&M intervention",
[BSSGP_CAUSE_BVCI_BLOCKED] = "BVCI blocked",
[BSSGP_CAUSE_PFC_CREATE_FAIL] = "PFC create failure",
[BSSGP_CAUSE_SEM_INCORR_PDU] = "Semantically incorrect PDU",
[BSSGP_CAUSE_INV_MAND_INF] = "Invalid mandatory information",
[BSSGP_CAUSE_MISSING_MAND_IE] = "Missing mandatory IE",
[BSSGP_CAUSE_MISSING_COND_IE] = "Missing conditional IE",
[BSSGP_CAUSE_UNEXP_COND_IE] = "Unexpected conditional IE",
[BSSGP_CAUSE_COND_IE_ERR] = "Conditional IE error",
[BSSGP_CAUSE_PDU_INCOMP_STATE] = "PDU incompatible with protocol state",
[BSSGP_CAUSE_PROTO_ERR_UNSPEC] = "Protocol error - unspecified",
[BSSGP_CAUSE_PDU_INCOMP_FEAT] = "PDU not compatible with feature set",
};
static const char *bssgp_cause_str(enum gprs_bssgp_cause cause)
{
if (cause >= ARRAY_SIZE(bssgp_cause_strings))
return "undefined";
if (bssgp_cause_strings[cause])
return bssgp_cause_strings[cause];
return "undefined";
}
static inline int bssgp_tlv_parse(struct tlv_parsed *tp, u_int8_t *buf, int len)
{
return tlv_parse(tp, &tvlv_att_def, buf, len, 0, 0);
}
static inline struct msgb *bssgp_msgb_alloc(void)
{
return msgb_alloc_headroom(4096, 128, "BSSGP");
}
/* Transmit a simple response such as BLOCK/UNBLOCK/RESET ACK/NACK */
static int bssgp_tx_simple_bvci(u_int8_t pdu_type, u_int16_t bvci, u_int16_t ns_bvci)
{
struct msgb *msg = bssgp_msgb_alloc();
struct bssgp_normal_hdr *bgph =
(struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph));
u_int16_t _bvci;
bgph->pdu_type = pdu_type;
_bvci = htons(bvci);
msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (u_int8_t *) &_bvci);
return gprs_ns_sendmsg(NULL, ns_bvci, msg);
}
/* Chapter 10.4.5: Flow Control BVC ACK */
static int bssgp_tx_fc_bvc_ack(u_int8_t tag, u_int16_t ns_bvci)
{
struct msgb *msg = bssgp_msgb_alloc();
struct bssgp_normal_hdr *bgph =
(struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph));
bgph->pdu_type = BSSGP_PDUT_FLOW_CONTROL_BVC_ACK;
msgb_tvlv_put(msg, BSSGP_IE_TAG, 1, &tag);
return gprs_ns_sendmsg(NULL, ns_bvci, msg);
}
/* Chapter 10.4.14: Status */
static int bssgp_tx_status(u_int8_t cause, u_int16_t *bvci, struct msgb *orig_msg)
{
struct msgb *msg = bssgp_msgb_alloc();
struct bssgp_normal_hdr *bgph =
(struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph));
DEBUGPC(DGPRS, "BSSGP: TX STATUS, cause=%s\n", bssgp_cause_str(cause));
bgph->pdu_type = BSSGP_PDUT_STATUS;
msgb_tvlv_put(msg, BSSGP_IE_CAUSE, 1, &cause);
if (bvci) {
u_int16_t _bvci = htons(*bvci);
msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (u_int8_t *) &_bvci);
}
if (orig_msg)
msgb_tvlv_put(msg, BSSGP_IE_PDU_IN_ERROR,
msgb_l3len(orig_msg), orig_msg->l3h);
return gprs_ns_sendmsg(NULL, 0, msg);
}
/* Uplink unit-data */
static int bssgp_rx_ul_ud(struct msgb *msg, u_int16_t bvci)
{
struct bssgp_ud_hdr *budh = (struct bssgp_ud_hdr *) msg->l3h;
struct gsm_bts *bts;
int data_len = msgb_l3len(msg) - sizeof(*budh);
struct tlv_parsed tp;
int rc;
DEBUGP(DGPRS, "BSSGP UL-UD\n");
msg->tlli = ntohl(budh->tlli);
rc = bssgp_tlv_parse(&tp, budh->data, data_len);
/* Cell ID and LLC_PDU are the only mandatory IE */
if (!TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID) ||
!TLVP_PRESENT(&tp, BSSGP_IE_LLC_PDU))
return -EIO;
/* Determine the BTS based on the Cell ID */
bts = gsm48_bts_by_ra_id(bsc_gsmnet,
TLVP_VAL(&tp, BSSGP_IE_CELL_ID),
TLVP_LEN(&tp, BSSGP_IE_CELL_ID));
if (bts)
msg->trx = bts->c0;
msg->llch = TLVP_VAL(&tp, BSSGP_IE_LLC_PDU);
return gprs_llc_rcvmsg(msg, &tp);
}
static int bssgp_rx_suspend(struct msgb *msg, u_int16_t bvci)
{
struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msg->l3h;
int data_len = msgb_l3len(msg) - sizeof(*bgph);
struct tlv_parsed tp;
int rc;
DEBUGP(DGPRS, "BSSGP SUSPEND\n");
rc = bssgp_tlv_parse(&tp, bgph->data, data_len);
if (rc < 0)
return rc;
if (!TLVP_PRESENT(&tp, BSSGP_IE_TLLI) ||
!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA))
return -EIO;
/* SEND SUSPEND_ACK or SUSPEND_NACK */
/* FIXME */
}
static int bssgp_rx_resume(struct msgb *msg, u_int16_t bvci)
{
struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msg->l3h;
int data_len = msgb_l3len(msg) - sizeof(*bgph);
struct tlv_parsed tp;
int rc;
DEBUGP(DGPRS, "BSSGP RESUME\n");
rc = bssgp_tlv_parse(&tp, bgph->data, data_len);
if (rc < 0)
return rc;
if (!TLVP_PRESENT(&tp, BSSGP_IE_TLLI) ||
!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA) ||
!TLVP_PRESENT(&tp, BSSGP_IE_SUSPEND_REF_NR))
return -EIO;
/* SEND RESUME_ACK or RESUME_NACK */
/* FIXME */
}
static int bssgp_rx_fc_bvc(struct msgb *msg, struct tlv_parsed *tp,
u_int16_t ns_bvci)
{
DEBUGP(DGPRS, "BSSGP FC BVC\n");
if (!TLVP_PRESENT(tp, BSSGP_IE_TAG) ||
!TLVP_PRESENT(tp, BSSGP_IE_BVC_BUCKET_SIZE) ||
!TLVP_PRESENT(tp, BSSGP_IE_BUCKET_LEAK_RATE) ||
!TLVP_PRESENT(tp, BSSGP_IE_BMAX_DEFAULT_MS) ||
!TLVP_PRESENT(tp, BSSGP_IE_R_DEFAULT_MS))
return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
/* Send FLOW_CONTROL_BVC_ACK */
return bssgp_tx_fc_bvc_ack(*TLVP_VAL(tp, BSSGP_IE_TAG), ns_bvci);
}
/* We expect msg->l3h to point to the BSSGP header */
int gprs_bssgp_rcvmsg(struct msgb *msg, u_int16_t ns_bvci)
{
struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msg->l3h;
struct tlv_parsed tp;
u_int8_t pdu_type = bgph->pdu_type;
int data_len = msgb_l3len(msg) - sizeof(*bgph);
u_int16_t bvci;
int rc = 0;
if (pdu_type != BSSGP_PDUT_UL_UNITDATA &&
pdu_type != BSSGP_PDUT_DL_UNITDATA)
rc = bssgp_tlv_parse(&tp, bgph->data, data_len);
switch (pdu_type) {
case BSSGP_PDUT_UL_UNITDATA:
/* some LLC data from the MS */
rc = bssgp_rx_ul_ud(msg, ns_bvci);
break;
case BSSGP_PDUT_RA_CAPABILITY:
/* BSS requests RA capability or IMSI */
DEBUGP(DGPRS, "BSSGP RA CAPABILITY UPDATE\n");
/* FIXME: send RA_CAPA_UPDATE_ACK */
break;
case BSSGP_PDUT_RADIO_STATUS:
DEBUGP(DGPRS, "BSSGP RADIO STATUS\n");
/* BSS informs us of some exception */
break;
case BSSGP_PDUT_SUSPEND:
/* MS wants to suspend */
rc = bssgp_rx_suspend(msg, ns_bvci);
break;
case BSSGP_PDUT_RESUME:
/* MS wants to resume */
rc = bssgp_rx_resume(msg, ns_bvci);
break;
case BSSGP_PDUT_FLUSH_LL:
/* BSS informs MS has moved to one cell to other cell */
DEBUGP(DGPRS, "BSSGP FLUSH LL\n");
/* Send FLUSH_LL_ACK */
break;
case BSSGP_PDUT_LLC_DISCARD:
/* BSS informs that some LLC PDU's have been discarded */
DEBUGP(DGPRS, "BSSGP LLC DISCARDED\n");
break;
case BSSGP_PDUT_FLOW_CONTROL_BVC:
/* BSS informs us of available bandwidth in Gb interface */
rc = bssgp_rx_fc_bvc(msg, &tp, ns_bvci);
break;
case BSSGP_PDUT_FLOW_CONTROL_MS:
/* BSS informs us of available bandwidth to one MS */
DEBUGP(DGPRS, "BSSGP FC MS\n");
/* Send FLOW_CONTROL_MS_ACK */
break;
case BSSGP_PDUT_BVC_BLOCK:
/* BSS tells us that BVC shall be blocked */
DEBUGP(DGPRS, "BSSGP BVC BLOCK ");
if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI) ||
!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE))
goto err_mand_ie;
bvci = ntohs(*(u_int16_t *)TLVP_VAL(&tp, BSSGP_IE_BVCI));
DEBUGPC(DGPRS, "BVCI=%u, cause=%s\n", bvci,
bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE)));
rc = bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK_ACK,
bvci, ns_bvci);
break;
case BSSGP_PDUT_BVC_UNBLOCK:
/* BSS tells us that BVC shall be unblocked */
DEBUGP(DGPRS, "BSSGP BVC UNBLOCK ");
if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI))
goto err_mand_ie;
bvci = ntohs(*(u_int16_t *)TLVP_VAL(&tp, BSSGP_IE_BVCI));
DEBUGPC(DGPRS, "BVCI=%u\n", bvci);
rc = bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_UNBLOCK_ACK,
bvci, ns_bvci);
break;
case BSSGP_PDUT_BVC_RESET:
/* BSS tells us that BVC init is required */
DEBUGP(DGPRS, "BSSGP BVC RESET ");
if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI) ||
!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE))
goto err_mand_ie;
bvci = ntohs(*(u_int16_t *)TLVP_VAL(&tp, BSSGP_IE_BVCI));
DEBUGPC(DGPRS, "BVCI=%u, cause=%s\n", bvci,
bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE)));
rc = bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK,
bvci, ns_bvci);
break;
case BSSGP_PDUT_STATUS:
/* Some exception has occurred */
case BSSGP_PDUT_DOWNLOAD_BSS_PFC:
case BSSGP_PDUT_CREATE_BSS_PFC_ACK:
case BSSGP_PDUT_CREATE_BSS_PFC_NACK:
case BSSGP_PDUT_MODIFY_BSS_PFC:
case BSSGP_PDUT_DELETE_BSS_PFC_ACK:
DEBUGP(DGPRS, "BSSGP PDU type 0x%02x not [yet] implemented\n",
pdu_type);
break;
/* those only exist in the SGSN -> BSS direction */
case BSSGP_PDUT_DL_UNITDATA:
case BSSGP_PDUT_PAGING_PS:
case BSSGP_PDUT_PAGING_CS:
case BSSGP_PDUT_RA_CAPA_UPDATE_ACK:
case BSSGP_PDUT_SUSPEND_ACK:
case BSSGP_PDUT_SUSPEND_NACK:
case BSSGP_PDUT_RESUME_ACK:
case BSSGP_PDUT_RESUME_NACK:
case BSSGP_PDUT_FLUSH_LL_ACK:
case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK:
case BSSGP_PDUT_FLOW_CONTROL_MS_ACK:
case BSSGP_PDUT_BVC_BLOCK_ACK:
case BSSGP_PDUT_BVC_UNBLOCK_ACK:
case BSSGP_PDUT_SGSN_INVOKE_TRACE:
DEBUGP(DGPRS, "BSSGP PDU type 0x%02x only exists in DL\n",
pdu_type);
rc = -EINVAL;
break;
default:
DEBUGP(DGPRS, "BSSGP PDU type 0x%02x unknown\n", pdu_type);
break;
}
return rc;
err_mand_ie:
return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
}
int gprs_bssgp_tx_dl_ud(struct msgb *msg)
{
struct gsm_bts *bts;
struct bssgp_ud_hdr *budh;
u_int8_t llc_pdu_tlv_hdr_len = 2;
u_int8_t *llc_pdu_tlv, *qos_profile;
u_int16_t pdu_lifetime = 1000; /* centi-seconds */
u_int8_t qos_profile_default[3] = { 0x00, 0x00, 0x21 };
u_int16_t msg_len = msg->len;
if (!msg->trx) {
DEBUGP(DGPRS, "Cannot transmit DL-UD without TRX assigned\n");
return -EINVAL;
}
bts = msg->trx->bts;
if (msg->len > TVLV_MAX_ONEBYTE)
llc_pdu_tlv_hdr_len += 1;
/* prepend the tag and length of the LLC-PDU TLV */
llc_pdu_tlv = msgb_push(msg, llc_pdu_tlv_hdr_len);
llc_pdu_tlv[0] = BSSGP_IE_LLC_PDU;
if (llc_pdu_tlv_hdr_len > 2) {
llc_pdu_tlv[1] = msg_len >> 8;
llc_pdu_tlv[2] = msg_len & 0xff;
} else {
llc_pdu_tlv[1] = msg_len & 0x3f;
llc_pdu_tlv[1] |= 0x80;
}
/* FIXME: optional elements */
/* prepend the pdu lifetime */
pdu_lifetime = htons(pdu_lifetime);
msgb_tvlv_push(msg, BSSGP_IE_PDU_LIFETIME, 2, (u_int8_t *)&pdu_lifetime);
/* prepend the QoS profile, TLLI and pdu type */
budh = (struct bssgp_ud_hdr *) msgb_push(msg, sizeof(*budh));
memcpy(budh->qos_profile, qos_profile_default, sizeof(qos_profile_default));
budh->tlli = htonl(msg->tlli);
budh->pdu_type = BSSGP_PDUT_DL_UNITDATA;
return gprs_ns_sendmsg(NULL, bts->gprs.cell.bvci, msg);
}

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/* GPRS LLC protocol implementation as per 3GPP TS 04.64 */
/* (C) 2009 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <errno.h>
#include <openbsc/gsm_data.h>
#include <osmocore/msgb.h>
#include <openbsc/debug.h>
#include <osmocore/linuxlist.h>
#include <osmocore/timer.h>
#include <openbsc/gprs_bssgp.h>
#include <openbsc/gprs_llc.h>
#include <openbsc/crc24.h>
/* Section 4.5.2 Logical Link States + Annex C.2 */
enum gprs_llc_ll_state {
GPRS_LLS_UNASSIGNED = 1, /* No TLLI yet */
GPRS_LLS_ASSIGNED_ADM = 2, /* TLLI assigned */
GPRS_LLS_LOCAL_EST = 3, /* Local Establishment */
GPRS_LLS_REMOTE_EST = 4, /* Remote Establishment */
GPRS_LLS_ABM = 5,
GPRS_LLS_LOCAL_REL = 6, /* Local Release */
GPRS_LLS_TIMER_REC = 7, /* Timer Recovery */
};
/* Section 4.7.1: Logical Link Entity: One per DLCI (TLLI + SAPI) */
struct gprs_llc_lle {
struct llist_head list;
struct timer_list t200;
struct timer_list t201; /* wait for acknowledgement */
enum gprs_llc_ll_state state;
u_int32_t tlli;
u_int32_t sapi;
u_int8_t v_sent;
u_int8_t v_ack;
u_int8_t v_recv;
unsigned int n200;
unsigned int retrans_ctr;
};
enum gprs_llc_cmd {
GPRS_LLC_NULL,
GPRS_LLC_RR,
GPRS_LLC_ACK,
GPRS_LLC_RNR,
GPRS_LLC_SACK,
GPRS_LLC_DM,
GPRS_LLC_DISC,
GPRS_LLC_UA,
GPRS_LLC_SABM,
GPRS_LLC_FRMR,
GPRS_LLC_XID,
};
struct gprs_llc_hdr_parsed {
u_int8_t sapi;
u_int8_t is_cmd:1,
ack_req:1,
is_encrypted:1;
u_int32_t seq_rx;
u_int32_t seq_tx;
u_int32_t fcs;
u_int32_t fcs_calc;
u_int8_t *data;
enum gprs_llc_cmd cmd;
};
#define LLC_ALLOC_SIZE 16384
#define UI_HDR_LEN 3
#define N202 4
#define CRC24_LENGTH 3
static int gprs_llc_fcs(u_int8_t *data, unsigned int len)
{
u_int32_t fcs_calc;
fcs_calc = crc24_calc(INIT_CRC24, data, len);
fcs_calc = ~fcs_calc;
fcs_calc &= 0xffffff;
return fcs_calc;
}
/* transmit a simple U frame */
static int gprs_llc_tx_u()
{
struct msgb *msg = msgb_alloc(LLC_ALLOC_SIZE, "GPRS/LLC");
if (!msg)
return -ENOMEM;
/* transmit the frame via BSSGP->NS->... */
}
static void t200_expired(void *data)
{
struct gprs_llc_lle *lle = data;
/* 8.5.1.3: Expiry of T200 */
if (lle->retrans_ctr >= lle->n200) {
/* FIXME: LLGM-STATUS-IND, LL-RELEASE-IND/CNF */
lle->state = GPRS_LLS_ASSIGNED_ADM;
}
switch (lle->state) {
case GPRS_LLS_LOCAL_EST:
/* retransmit SABM */
/* re-start T200 */
lle->retrans_ctr++;
break;
case GPRS_LLS_LOCAL_REL:
/* retransmit DISC */
/* re-start T200 */
lle->retrans_ctr++;
break;
}
}
static void t201_expired(void *data)
{
struct gprs_llc_lle *lle = data;
if (lle->retrans_ctr < lle->n200) {
/* transmit apropriate supervisory frame (8.6.4.1) */
/* set timer T201 */
lle->retrans_ctr++;
}
}
/* Transmit a UI frame over the given SAPI */
int gprs_llc_tx_ui(struct msgb *msg, u_int8_t sapi, int command)
{
u_int8_t *fcs, *llch;
u_int8_t addr, ctrl[2];
u_int32_t fcs_calc;
u_int16_t nu = 0;
/* Address Field */
addr = sapi & 0xf;
if (command)
addr |= 0x40;
/* Control Field */
ctrl[0] = 0xc0;
ctrl[0] |= nu >> 6;
ctrl[1] = (nu << 2) & 0xfc;
ctrl[1] |= 0x01; /* Protected Mode */
/* prepend LLC UI header */
llch = msgb_push(msg, 3);
llch[0] = addr;
llch[1] = ctrl[0];
llch[2] = ctrl[1];
/* append FCS to end of frame */
fcs = msgb_put(msg, 3);
fcs_calc = gprs_llc_fcs(llch, fcs - llch);
fcs[0] = fcs_calc & 0xff;
fcs[1] = (fcs_calc >> 8) & 0xff;
fcs[2] = (fcs_calc >> 16) & 0xff;
return gprs_bssgp_tx_dl_ud(msg);
}
static int gprs_llc_hdr_dump(struct gprs_llc_hdr_parsed *gph)
{
DEBUGP(DGPRS, "LLC SAPI=%u %c %c FCS=0x%06x(%s) ",
gph->sapi, gph->is_cmd ? 'C' : 'R', gph->ack_req ? 'A' : ' ',
gph->fcs, gph->fcs_calc == gph->fcs ? "correct" : "WRONG");
if (gph->cmd)
DEBUGPC(DGPRS, "CMD=%u ", gph->cmd);
if (gph->data)
DEBUGPC(DGPRS, "DATA ");
DEBUGPC(DGPRS, "\n");
}
static int gprs_llc_hdr_rx(struct gprs_llc_hdr_parsed *gph,
struct gprs_llc_lle *lle)
{
switch (gph->cmd) {
case GPRS_LLC_SABM: /* Section 6.4.1.1 */
lle->v_sent = lle->v_ack = lle->v_recv = 0;
if (lle->state == GPRS_LLS_ASSIGNED_ADM) {
/* start re-establishment (8.7.1) */
}
lle->state = GPRS_LLS_REMOTE_EST;
/* FIXME: Send UA */
lle->state = GPRS_LLS_ABM;
/* FIXME: process data */
break;
case GPRS_LLC_DISC: /* Section 6.4.1.2 */
/* FIXME: Send UA */
/* terminate ABM */
lle->state = GPRS_LLS_ASSIGNED_ADM;
break;
case GPRS_LLC_UA: /* Section 6.4.1.3 */
if (lle->state == GPRS_LLS_LOCAL_EST)
lle->state = GPRS_LLS_ABM;
break;
case GPRS_LLC_DM: /* Section 6.4.1.4: ABM cannot be performed */
if (lle->state == GPRS_LLS_LOCAL_EST)
lle->state = GPRS_LLS_ASSIGNED_ADM;
break;
case GPRS_LLC_FRMR: /* Section 6.4.1.5 */
break;
case GPRS_LLC_XID: /* Section 6.4.1.6 */
break;
}
return 0;
}
/* parse a GPRS LLC header, also check for invalid frames */
static int gprs_llc_hdr_parse(struct gprs_llc_hdr_parsed *ghp,
const u_int8_t *llc_hdr, int len)
{
u_int8_t *ctrl = llc_hdr+1;
int is_sack = 0;
unsigned int crc_length;
u_int32_t fcs_calc;
if (len <= CRC24_LENGTH)
return -EIO;
crc_length = len - CRC24_LENGTH;
ghp->ack_req = 0;
/* Section 5.5: FCS */
ghp->fcs = *(llc_hdr + len - 3);
ghp->fcs |= *(llc_hdr + len - 2) << 8;
ghp->fcs |= *(llc_hdr + len - 1) << 16;
/* Section 6.2.1: invalid PD field */
if (llc_hdr[0] & 0x80)
return -EIO;
/* This only works for the MS->SGSN direction */
if (llc_hdr[0] & 0x40)
ghp->is_cmd = 0;
else
ghp->is_cmd = 1;
ghp->sapi = llc_hdr[0] & 0xf;
/* Section 6.2.3: check for reserved SAPI */
switch (ghp->sapi) {
case 0:
case 4:
case 6:
case 0xa:
case 0xc:
case 0xd:
case 0xf:
return -EINVAL;
}
if ((ctrl[0] & 0x80) == 0) {
/* I (Information transfer + Supervisory) format */
u_int8_t k;
ghp->data = ctrl + 3;
if (ctrl[0] & 0x40)
ghp->ack_req = 1;
ghp->seq_tx = (ctrl[0] & 0x1f) << 4;
ghp->seq_tx |= (ctrl[1] >> 4);
ghp->seq_rx = (ctrl[1] & 0x7) << 6;
ghp->seq_rx |= (ctrl[2] >> 2);
switch (ctrl[2] & 0x03) {
case 0:
ghp->cmd = GPRS_LLC_RR;
break;
case 1:
ghp->cmd = GPRS_LLC_ACK;
break;
case 2:
ghp->cmd = GPRS_LLC_RNR;
break;
case 3:
ghp->cmd = GPRS_LLC_SACK;
k = ctrl[3] & 0x1f;
ghp->data += 1 + k;
break;
}
} else if ((ctrl[0] & 0xc0) == 0x80) {
/* S (Supervisory) format */
ghp->data = NULL;
if (ctrl[0] & 0x20)
ghp->ack_req = 1;
ghp->seq_rx = (ctrl[0] & 0x7) << 6;
ghp->seq_rx |= (ctrl[1] >> 2);
switch (ctrl[1] & 0x03) {
case 0:
ghp->cmd = GPRS_LLC_RR;
break;
case 1:
ghp->cmd = GPRS_LLC_ACK;
break;
case 2:
ghp->cmd = GPRS_LLC_RNR;
break;
case 3:
ghp->cmd = GPRS_LLC_SACK;
break;
}
} else if ((ctrl[0] & 0xe0) == 0xc0) {
/* UI (Unconfirmed Inforamtion) format */
ghp->data = ctrl + 2;
ghp->seq_tx = (ctrl[0] & 0x7) << 6;
ghp->seq_tx |= (ctrl[1] >> 2);
if (ctrl[1] & 0x02) {
ghp->is_encrypted = 1;
/* FIXME: encryption */
}
if (ctrl[1] & 0x01) {
/* FCS over hdr + all inf fields */
} else {
/* FCS over hdr + N202 octets (4) */
if (crc_length > UI_HDR_LEN + N202)
crc_length = UI_HDR_LEN + N202;
}
} else {
/* U (Unnumbered) format: 1 1 1 P/F M4 M3 M2 M1 */
ghp->data = NULL;
switch (ctrl[0] & 0xf) {
case 0:
ghp->cmd = GPRS_LLC_NULL;
break;
case 0x1:
ghp->cmd = GPRS_LLC_DM;
break;
case 0x4:
ghp->cmd = GPRS_LLC_DISC;
break;
case 0x6:
ghp->cmd = GPRS_LLC_UA;
break;
case 0x7:
ghp->cmd = GPRS_LLC_SABM;
break;
case 0x8:
ghp->cmd = GPRS_LLC_FRMR;
break;
case 0xb:
ghp->cmd = GPRS_LLC_XID;
break;
default:
return -EIO;
}
}
/* calculate what FCS we expect */
ghp->fcs_calc = gprs_llc_fcs(llc_hdr, crc_length);
/* FIXME: parse sack frame */
}
/* receive an incoming LLC PDU */
int gprs_llc_rcvmsg(struct msgb *msg, struct tlv_parsed *tv)
{
struct bssgp_ud_hdr *udh = (struct bssgp_ud_hdr *) msg->l3h;
struct gprs_llc_hdr *lh = msg->llch;
struct gprs_llc_hdr_parsed llhp;
struct gprs_llc_entity *lle;
int rc;
rc = gprs_llc_hdr_parse(&llhp, lh, TLVP_LEN(tv, BSSGP_IE_LLC_PDU));
/* FIXME: find LLC Entity */
gprs_llc_hdr_dump(&llhp);
rc = gprs_llc_hdr_rx(&llhp, lle);
if (llhp.data) {
msg->gmmh = llhp.data;
switch (llhp.sapi) {
case GPRS_SAPI_GMM:
rc = gsm0408_gprs_rcvmsg(msg);
}
}
return 0;
}

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/* GPRS Networks Service (NS) messages on the Gb interface
* 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) */
/* (C) 2009 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/* Some introduction into NS: NS is used typically on top of frame relay,
* but in the ip.access world it is encapsulated in UDP packets. It serves
* as an intermediate shim betwen BSSGP and the underlying medium. It doesn't
* do much, apart from providing congestion notification and status indication.
*
* Terms:
* NS Network Service
* NSVC NS Virtual Connection
* NSEI NS Entity Identifier
* NSVL NS Virtual Link
* NSVLI NS Virtual Link Identifier
* BVC BSSGP Virtual Connection
* BVCI BSSGP Virtual Connection Identifier
* NSVCG NS Virtual Connection Goup
* Blocked NS-VC cannot be used for user traffic
* Alive Ability of a NS-VC to provide communication
*
* There can be multiple BSSGP virtual connections over one (group of) NSVC's. BSSGP will
* therefore identify the BSSGP virtual connection by a BVCI passed down to NS.
* NS then has to firgure out which NSVC's are responsible for this BVCI.
* Those mappings are administratively configured.
*/
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <openbsc/gsm_data.h>
#include <osmocore/msgb.h>
#include <osmocore/tlv.h>
#include <osmocore/talloc.h>
#include <openbsc/debug.h>
#include <openbsc/gprs_ns.h>
#include <openbsc/gprs_bssgp.h>
#define NS_ALLOC_SIZE 1024
static const struct tlv_definition ns_att_tlvdef = {
.def = {
[NS_IE_CAUSE] = { TLV_TYPE_TvLV, 0 },
[NS_IE_VCI] = { TLV_TYPE_TvLV, 0 },
[NS_IE_PDU] = { TLV_TYPE_TvLV, 0 },
[NS_IE_BVCI] = { TLV_TYPE_TvLV, 0 },
[NS_IE_NSEI] = { TLV_TYPE_TvLV, 0 },
},
};
#define NSE_S_BLOCKED 0x0001
#define NSE_S_ALIVE 0x0002
struct gprs_nsvc {
struct llist_head list;
u_int16_t nsei; /* end-to-end significance */
u_int16_t nsvci; /* uniquely identifies NS-VC at SGSN */
u_int32_t state;
struct timer_list alive_timer;
int timer_is_tns_alive;
int alive_retries;
};
/* FIXME: dynamically search for the matching NSVC */
static struct gprs_nsvc dummy_nsvc = { .state = NSE_S_BLOCKED | NSE_S_ALIVE };
/* Section 10.3.2, Table 13 */
static const char *ns_cause_str[] = {
[NS_CAUSE_TRANSIT_FAIL] = "Transit network failure",
[NS_CAUSE_OM_INTERVENTION] = "O&M intervention",
[NS_CAUSE_EQUIP_FAIL] = "Equipment failure",
[NS_CAUSE_NSVC_BLOCKED] = "NS-VC blocked",
[NS_CAUSE_NSVC_UNKNOWN] = "NS-VC unknown",
[NS_CAUSE_BVCI_UNKNOWN] = "BVCI unknown",
[NS_CAUSE_SEM_INCORR_PDU] = "Semantically incorrect PDU",
[NS_CAUSE_PDU_INCOMP_PSTATE] = "PDU not compatible with protocol state",
[NS_CAUSE_PROTO_ERR_UNSPEC] = "Protocol error, unspecified",
[NS_CAUSE_INVAL_ESSENT_IE] = "Invalid essential IE",
[NS_CAUSE_MISSING_ESSENT_IE] = "Missing essential IE",
};
static const char *gprs_ns_cause_str(enum ns_cause cause)
{
if (cause >= ARRAY_SIZE(ns_cause_str))
return "undefined";
if (ns_cause_str[cause])
return ns_cause_str[cause];
return "undefined";
}
static int gprs_ns_tx(struct msgb *msg)
{
return ipac_gprs_send(msg);
}
static int gprs_ns_tx_simple(struct gprs_ns_link *link, u_int8_t pdu_type)
{
struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "GPRS/NS");
struct gprs_ns_hdr *nsh;
if (!msg)
return -ENOMEM;
nsh = (struct gprs_ns_hdr *) msgb_put(msg, sizeof(*nsh));
nsh->pdu_type = pdu_type;
return gprs_ns_tx(msg);
}
#define NS_TIMER_ALIVE 3, 0 /* after 3 seconds without response, we retry */
#define NS_TIMER_TEST 30, 0 /* every 10 seconds we check if the BTS is still alive */
#define NS_ALIVE_RETRIES 10 /* after 3 failed retransmit we declare BTS as dead */
static void gprs_ns_alive_cb(void *data)
{
struct gprs_nsvc *nsvc = data;
if (nsvc->timer_is_tns_alive) {
/* Tns-alive case: we expired without response ! */
nsvc->alive_retries++;
if (nsvc->alive_retries > NS_ALIVE_RETRIES) {
/* mark as dead and blocked */
nsvc->state = NSE_S_BLOCKED;
DEBUGP(DGPRS, "Tns-alive more then %u retries, "
" blocking NS-VC\n", NS_ALIVE_RETRIES);
/* FIXME: inform higher layers */
return;
}
} else {
/* Tns-test case: send NS-ALIVE PDU */
gprs_ns_tx_simple(NULL, NS_PDUT_ALIVE);
/* start Tns-alive timer */
nsvc->timer_is_tns_alive = 1;
}
bsc_schedule_timer(&nsvc->alive_timer, NS_TIMER_ALIVE);
}
/* Section 9.2.6 */
static int gprs_ns_tx_reset_ack(u_int16_t nsvci, u_int16_t nsei)
{
struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "GPRS/NS");
struct gprs_ns_hdr *nsh;
if (!msg)
return -ENOMEM;
nsvci = htons(nsvci);
nsei = htons(nsei);
nsh = (struct gprs_ns_hdr *) msgb_put(msg, sizeof(*nsh));
nsh->pdu_type = NS_PDUT_RESET_ACK;
msgb_tvlv_put(msg, NS_IE_VCI, 2, (u_int8_t *)&nsvci);
msgb_tvlv_put(msg, NS_IE_NSEI, 2, (u_int8_t *)&nsei);
return gprs_ns_tx(msg);
}
/* Section 9.2.10: transmit side */
int gprs_ns_sendmsg(struct gprs_ns_link *link, u_int16_t bvci,
struct msgb *msg)
{
struct gprs_ns_hdr *nsh;
nsh = (struct gprs_ns_hdr *) msgb_push(msg, sizeof(*nsh) + 3);
if (!nsh) {
DEBUGP(DGPRS, "Not enough headroom for NS header\n");
return -EIO;
}
nsh->pdu_type = NS_PDUT_UNITDATA;
/* spare octet in data[0] */
nsh->data[1] = bvci >> 8;
nsh->data[2] = bvci & 0xff;
return gprs_ns_tx(msg);
}
/* Section 9.2.10: receive side */
static int gprs_ns_rx_unitdata(struct msgb *msg)
{
struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *)msg->l2h;
u_int16_t bvci;
/* spare octet in data[0] */
bvci = nsh->data[1] << 8 | nsh->data[2];
msg->l3h = &nsh->data[3];
/* call upper layer (BSSGP) */
return gprs_bssgp_rcvmsg(msg, bvci);
}
/* Section 9.2.7 */
static int gprs_ns_rx_status(struct msgb *msg)
{
struct gprs_ns_hdr *nsh = msg->l2h;
struct tlv_parsed tp;
u_int8_t cause;
int rc;
DEBUGP(DGPRS, "NS STATUS ");
rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, msgb_l2len(msg), 0, 0);
if (!TLVP_PRESENT(&tp, NS_IE_CAUSE)) {
DEBUGPC(DGPRS, "missing cause IE\n");
return -EINVAL;
}
cause = *TLVP_VAL(&tp, NS_IE_CAUSE);
DEBUGPC(DGPRS, "cause=%s\n", gprs_ns_cause_str(cause));
return 0;
}
/* Section 7.3 */
static int gprs_ns_rx_reset(struct msgb *msg)
{
struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h;
struct gprs_nsvc *nsvc = &dummy_nsvc;
struct tlv_parsed tp;
u_int8_t *cause;
u_int16_t *nsvci, *nsei;
int rc;
DEBUGP(DGPRS, "NS RESET ");
rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, msgb_l2len(msg), 0, 0);
if (!TLVP_PRESENT(&tp, NS_IE_CAUSE) ||
!TLVP_PRESENT(&tp, NS_IE_VCI) ||
!TLVP_PRESENT(&tp, NS_IE_NSEI)) {
/* FIXME: respond with NS_CAUSE_MISSING_ESSENT_IE */
DEBUGPC(DGPRS, "Missing mandatory IE\n");
return -EINVAL;
}
cause = (u_int8_t *) TLVP_VAL(&tp, NS_IE_CAUSE);
nsvci = (u_int16_t *) TLVP_VAL(&tp, NS_IE_VCI);
nsei = (u_int16_t *) TLVP_VAL(&tp, NS_IE_NSEI);
*nsvci = ntohs(*nsvci);
*nsei = ntohs(*nsei);
DEBUGPC(DGPRS, "cause=%s, NSVCI=%u, NSEI=%u\n",
gprs_ns_cause_str(*cause), *nsvci, *nsei);
/* mark the NS-VC as blocked and alive */
nsvc->state = NSE_S_BLOCKED | NSE_S_ALIVE;
nsvc->nsei = *nsei;
nsvc->nsvci = *nsvci;
/* start the test procedure */
nsvc->alive_timer.cb = gprs_ns_alive_cb;
nsvc->alive_timer.data = nsvc;
bsc_schedule_timer(&nsvc->alive_timer, NS_TIMER_ALIVE);
return gprs_ns_tx_reset_ack(*nsvci, *nsei);
}
/* main entry point, here incoming NS frames enter */
int gprs_ns_rcvmsg(struct msgb *msg)
{
struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h;
struct gprs_nsvc *nsvc = &dummy_nsvc;
int rc = 0;
switch (nsh->pdu_type) {
case NS_PDUT_ALIVE:
/* remote end inquires whether we're still alive,
* we need to respond with ALIVE_ACK */
rc = gprs_ns_tx_simple(NULL, NS_PDUT_ALIVE_ACK);
break;
case NS_PDUT_ALIVE_ACK:
/* stop Tns-alive */
bsc_del_timer(&nsvc->alive_timer);
/* start Tns-test */
nsvc->timer_is_tns_alive = 0;
bsc_schedule_timer(&nsvc->alive_timer, NS_TIMER_TEST);
break;
case NS_PDUT_UNITDATA:
/* actual user data */
rc = gprs_ns_rx_unitdata(msg);
break;
case NS_PDUT_STATUS:
rc = gprs_ns_rx_status(msg);
break;
case NS_PDUT_RESET:
rc = gprs_ns_rx_reset(msg);
break;
case NS_PDUT_RESET_ACK:
/* FIXME: mark remote NS-VC as blocked + active */
break;
case NS_PDUT_UNBLOCK:
/* Section 7.2: unblocking procedure */
DEBUGP(DGPRS, "NS UNBLOCK\n");
nsvc->state &= ~NSE_S_BLOCKED;
rc = gprs_ns_tx_simple(NULL, NS_PDUT_UNBLOCK_ACK);
break;
case NS_PDUT_UNBLOCK_ACK:
/* FIXME: mark remote NS-VC as unblocked + active */
break;
case NS_PDUT_BLOCK:
DEBUGP(DGPRS, "NS BLOCK\n");
nsvc->state |= NSE_S_BLOCKED;
rc = gprs_ns_tx_simple(NULL, NS_PDUT_UNBLOCK_ACK);
break;
case NS_PDUT_BLOCK_ACK:
/* FIXME: mark remote NS-VC as blocked + active */
break;
default:
DEBUGP(DGPRS, "Unknown NS PDU type 0x%02x\n", nsh->pdu_type);
rc = -EINVAL;
break;
}
return rc;
}

93
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/* GPRS SGSN functionality */
/* (C) 2009 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <sys/types.h>
#include <osmocore/linuxlist.h>
#include <osmocore/talloc.h>
#include <osmocore/timer.h>
#include <openbsc/gsm_subscriber.h>
#include <openbsc/gprs_sgsn.h>
static LLIST_HEAD(sgsn_mm_ctxts);
static int ra_id_equals(const struct gprs_ra_id *id1,
const struct gprs_ra_id *id2)
{
return (id1->mcc == id2->mcc && id1->mnc == id2->mnc &&
id1->lac == id2->lac && id1->rac == id2->rac);
}
/* look-up a SGSN MM context based on TLLI + RAI */
struct sgsn_mm_ctx *sgsn_mm_ctx_by_tlli(u_int32_t tlli,
const struct gprs_ra_id *raid)
{
struct sgsn_mm_ctx *ctx;
llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) {
if (tlli == ctx->tlli &&
ra_id_equals(raid, &ctx->ra))
return ctx;
}
return NULL;
}
struct sgsn_mm_ctx *sgsn_mm_ctx_by_ptmsi(u_int32_t p_tmsi)
{
struct sgsn_mm_ctx *ctx;
llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) {
if (p_tmsi == ctx->p_tmsi)
return ctx;
}
return NULL;
}
struct sgsn_mm_ctx *sgsn_mm_ctx_by_imsi(const char *imsi)
{
struct sgsn_mm_ctx *ctx;
llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) {
if (!strcmp(imsi, ctx->imsi))
return ctx;
}
return NULL;
}
/* Allocate a new SGSN MM context */
struct sgsn_mm_ctx *sgsn_mm_ctx_alloc(u_int32_t tlli,
const struct gprs_ra_id *raid)
{
struct sgsn_mm_ctx *ctx = talloc_zero(NULL, struct sgsn_mm_ctx);
if (!ctx)
return NULL;
memcpy(&ctx->ra, raid, sizeof(ctx->ra));
ctx->tlli = tlli;
ctx->mm_state = GMM_DEREGISTERED;
llist_add(&ctx->list, &sgsn_mm_ctxts);
return ctx;
}

716
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/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
/* (C) 2009 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h>
#include <openbsc/db.h>
#include <osmocore/msgb.h>
#include <osmocore/tlv.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <osmocore/gsm_utils.h>
#include <openbsc/gsm_subscriber.h>
#include <openbsc/gsm_04_08.h>
#include <openbsc/gsm_04_08_gprs.h>
#include <openbsc/paging.h>
#include <osmocore/signal.h>
#include <osmocore/talloc.h>
#include <openbsc/transaction.h>
#include <openbsc/gprs_llc.h>
#include <openbsc/gprs_sgsn.h>
/* 10.5.5.14 GPRS MM Cause / Table 10.5.147 */
struct value_string gmm_cause_names[] = {
/* FIXME */
{ GMM_CAUSE_SEM_INCORR_MSG, "Semantically incorrect message" },
{ GMM_CAUSE_INV_MAND_INFO, "Invalid mandatory information" },
{ GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL,
"Message type non-existant or not implemented" },
{ GMM_CAUSE_MSGT_INCOMP_P_STATE,
"Message type not compatible with protocol state" },
{ GMM_CAUSE_IE_NOTEXIST_NOTIMPL,
"Information element non-existent or not implemented" },
{ GMM_CAUSE_COND_IE_ERR, "Conditional IE error" },
{ GMM_CAUSE_MSG_INCOMP_P_STATE,
"Message not compatible with protocol state " },
{ GMM_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" },
{ 0, NULL }
};
/* 10.5.6.6 SM Cause / Table 10.5.157 */
struct value_string gsm_cause_names[] = {
{ GSM_CAUSE_INSUFF_RSRC, "Insufficient resources" },
{ GSM_CAUSE_MISSING_APN, "Missing or unknown APN" },
{ GSM_CAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" },
{ GSM_CAUSE_AUTH_FAILED, "User Authentication failed" },
{ GSM_CAUSE_ACT_REJ_GGSN, "Activation rejected by GGSN" },
{ GSM_CAUSE_ACT_REJ_UNSPEC, "Activation rejected, unspecified" },
{ GSM_CAUSE_SERV_OPT_NOTSUPP, "Service option not supported" },
{ GSM_CAUSE_REQ_SERV_OPT_NOTSUB,
"Requested service option not subscribed" },
{ GSM_CAUSE_SERV_OPT_TEMP_OOO,
"Service option temporarily out of order" },
{ GSM_CAUSE_NSAPI_IN_USE, "NSAPI already used" },
{ GSM_CAUSE_DEACT_REGULAR, "Regular deactivation" },
{ GSM_CAUSE_QOS_NOT_ACCEPTED, "QoS not accepted" },
{ GSM_CAUSE_NET_FAIL, "Network Failure" },
{ GSM_CAUSE_REACT_RQD, "Reactivation required" },
{ GSM_CAUSE_FEATURE_NOTSUPP, "Feature not supported " },
{ GSM_CAUSE_INVALID_TRANS_ID, "Invalid transaction identifier" },
{ GSM_CAUSE_SEM_INCORR_MSG, "Semantically incorrect message" },
{ GSM_CAUSE_INV_MAND_INFO, "Invalid mandatory information" },
{ GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL,
"Message type non-existant or not implemented" },
{ GSM_CAUSE_MSGT_INCOMP_P_STATE,
"Message type not compatible with protocol state" },
{ GSM_CAUSE_IE_NOTEXIST_NOTIMPL,
"Information element non-existent or not implemented" },
{ GSM_CAUSE_COND_IE_ERR, "Conditional IE error" },
{ GSM_CAUSE_MSG_INCOMP_P_STATE,
"Message not compatible with protocol state " },
{ GSM_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" },
{ 0, NULL }
};
static const char *att_name(u_int8_t type)
{
switch (type) {
case GPRS_ATT_T_ATTACH:
return "GPRS attach";
case GPRS_ATT_T_ATT_WHILE_IMSI:
return "GPRS attach while IMSI attached";
case GPRS_ATT_T_COMBINED:
return "Combined GPRS/IMSI attach";
default:
return "unknown";
}
}
static const char *upd_name(u_int8_t type)
{
switch (type) {
case GPRS_UPD_T_RA:
return "RA updating";
case GPRS_UPD_T_RA_LA:
return "combined RA/LA updating";
case GPRS_UPD_T_RA_LA_IMSI_ATT:
return "combined RA/LA updating + IMSI attach";
case GPRS_UPD_T_PERIODIC:
return "periodic updating";
}
return "unknown";
}
void gsm48_parse_ra(struct gprs_ra_id *raid, const u_int8_t *buf)
{
raid->mcc = (buf[0] & 0xf) * 100;
raid->mcc += (buf[0] >> 4) * 10;
raid->mcc += (buf[1] & 0xf) * 1;
/* I wonder who came up with the stupidity of encoding the MNC
* differently depending on how many digits its decimal number has! */
if ((buf[1] >> 4) == 0xf) {
raid->mnc = (buf[2] & 0xf) * 10;
raid->mnc += (buf[2] >> 4) * 1;
} else {
raid->mnc = (buf[2] & 0xf) * 100;
raid->mnc += (buf[2] >> 4) * 10;
raid->mnc += (buf[1] >> 4) * 1;
}
raid->lac = ntohs(*(u_int16_t *)(buf + 3));
raid->rac = buf[5];
}
/* Send a message through the underlying layer */
static int gsm48_gmm_sendmsg(struct msgb *msg, int command)
{
return gprs_llc_tx_ui(msg, GPRS_SAPI_GMM, command);
}
/* TS 03.03 Chapter 2.6 */
int gprs_tlli_type(u_int32_t tlli)
{
if ((tlli & 0xc0000000) == 0xc0000000)
return TLLI_LOCAL;
else if ((tlli & 0xc0000000) == 0x80000000)
return TLLI_FOREIGN;
else if ((tlli & 0xf8000000) == 0x78000000)
return TLLI_RANDOM;
else if ((tlli & 0xf8000000) == 0x70000000)
return TLLI_AUXILIARY;
return TLLI_RESERVED;
}
/* Chapter 9.4.2: Attach accept */
static int gsm48_tx_gmm_att_ack(struct msgb *old_msg)
{
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh;
struct gsm48_attach_ack *aa;
DEBUGP(DMM, "<- GPRS ATTACH ACCEPT\n");
msg->tlli = old_msg->tlli;
msg->trx = old_msg->trx;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_MM_GPRS;
gh->msg_type = GSM48_MT_GMM_ATTACH_ACK;
aa = (struct gsm48_attach_ack *) msgb_put(msg, sizeof(*aa));
aa->force_stby = 0; /* not indicated */
aa->att_result = 1; /* GPRS only */
aa->ra_upd_timer = GPRS_TMR_MINUTE | 10;
aa->radio_prio = 4; /* lowest */
gsm48_ra_id_by_bts(aa->ra_id.digits, old_msg->trx->bts);
/* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */
return gsm48_gmm_sendmsg(msg, 0);
}
/* Chapter 9.4.5: Attach reject */
static int gsm48_tx_gmm_att_rej(struct msgb *old_msg, u_int8_t gmm_cause)
{
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh;
DEBUGP(DMM, "<- GPRS ATTACH REJECT\n");
msg->tlli = old_msg->tlli;
msg->trx = old_msg->trx;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
gh->proto_discr = GSM48_PDISC_MM_GPRS;
gh->msg_type = GSM48_MT_GMM_ATTACH_REJ;
gh->data[0] = gmm_cause;
return gsm48_gmm_sendmsg(msg, 0);
}
/* Transmit Chapter 9.4.12 Identity Request */
static int gsm48_tx_gmm_id_req(struct msgb *old_msg, u_int8_t id_type)
{
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh;
DEBUGP(DMM, "-> GPRS IDENTITY REQUEST: mi_type=%02x\n", id_type);
msg->tlli = old_msg->tlli;
msg->trx = old_msg->trx;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
gh->proto_discr = GSM48_PDISC_MM_GPRS;
gh->msg_type = GSM48_MT_GMM_ID_REQ;
/* 10.5.5.9 ID type 2 + identity type and 10.5.5.7 'force to standby' IE */
gh->data[0] = id_type & 0xf;
return gsm48_gmm_sendmsg(msg, 0);
}
/* Check if we can already authorize a subscriber */
static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx, struct msgb *msg)
{
if (strlen(ctx->imei) && strlen(ctx->imsi)) {
ctx->mm_state = GMM_REGISTERED_NORMAL;
return gsm48_tx_gmm_att_ack(msg);
}
if (!strlen(ctx->imei))
return gsm48_tx_gmm_id_req(msg, GSM_MI_TYPE_IMEI);
if (!strlen(ctx->imsi))
return gsm48_tx_gmm_id_req(msg, GSM_MI_TYPE_IMSI);
return 0;
}
/* Parse Chapter 9.4.13 Identity Response */
static int gsm48_rx_gmm_id_resp(struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->gmmh;
u_int8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK;
char mi_string[GSM48_MI_SIZE];
struct gprs_ra_id ra_id;
struct sgsn_mm_ctx *ctx;
gsm48_mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]);
DEBUGP(DMM, "GMM IDENTITY RESPONSE: mi_type=0x%02x MI(%s) ",
mi_type, mi_string);
gprs_ra_id_by_bts(&ra_id, msg->trx->bts);
ctx = sgsn_mm_ctx_by_tlli(msg->tlli, &ra_id);
if (!ctx) {
DEBUGP(DMM, "from unknown TLLI 0x%08x?!?\n", msg->tlli);
return -EINVAL;
}
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
/* we already have a mm context with current TLLI, but no
* P-TMSI / IMSI yet. What we now need to do is to fill
* this initial context with data from the HLR */
strncpy(ctx->imsi, mi_string, sizeof(ctx->imei));
break;
case GSM_MI_TYPE_IMEI:
strncpy(ctx->imei, mi_string, sizeof(ctx->imei));
break;
case GSM_MI_TYPE_IMEISV:
break;
}
DEBUGPC(DMM, "\n");
/* Check if we can let the mobile station enter */
return gsm48_gmm_authorize(ctx, msg);
}
static void attach_rej_cb(void *data)
{
struct sgsn_mm_ctx *ctx = data;
/* FIXME: determine through which BTS/TRX to send this */
//gsm48_tx_gmm_att_rej(ctx->tlli, GMM_CAUSE_MS_ID_NOT_DERIVED);
ctx->mm_state = GMM_DEREGISTERED;
/* FIXME: release the context */
}
static void schedule_reject(struct sgsn_mm_ctx *ctx)
{
ctx->T = 3370;
ctx->timer.cb = attach_rej_cb;
ctx->timer.data = ctx;
bsc_schedule_timer(&ctx->timer, 6, 0);
}
/* Section 9.4.1 Attach request */
static int gsm48_rx_gmm_att_req(struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->gmmh;
u_int8_t *cur = gh->data, *msnc, *mi, *old_ra_info;
u_int8_t msnc_len, att_type, mi_len, mi_type;
u_int16_t drx_par;
u_int32_t tmsi;
char mi_string[GSM48_MI_SIZE];
struct gprs_ra_id ra_id;
struct sgsn_mm_ctx *ctx;
DEBUGP(DMM, "GMM ATTACH REQUEST ");
/* As per TS 04.08 Chapter 4.7.1.4, the attach request arrives either
* with a foreign TLLI (P-TMSI that was allocated to the MS before),
* or with random TLLI. */
gprs_ra_id_by_bts(&ra_id, msg->trx->bts);
/* MS network capability 10.5.5.12 */
msnc_len = *cur++;
msnc = cur;
if (msnc_len > 2)
goto err_inval;
cur += msnc_len;
/* aTTACH Type 10.5.5.2 */
att_type = *cur++ & 0x0f;
/* DRX parameter 10.5.5.6 */
drx_par = *cur++;
drx_par |= *cur++ << 8;
/* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */
mi_len = *cur++;
mi = cur;
if (mi_len > 8)
goto err_inval;
mi_type = *mi & GSM_MI_TYPE_MASK;
cur += mi_len;
gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_string, att_name(att_type));
/* Old routing area identification 10.5.5.15 */
old_ra_info = cur;
cur += 6;
/* MS Radio Access Capability 10.5.5.12a */
/* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status */
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
/* Try to find MM context based on IMSI */
ctx = sgsn_mm_ctx_by_imsi(mi_string);
if (!ctx) {
#if 0
return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_IMSI_UNKNOWN);
#else
/* As a temorary hack, we simply assume that the IMSI exists */
ctx = sgsn_mm_ctx_alloc(0, &ra_id);
if (!ctx)
return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_NET_FAIL);
strncpy(ctx->imsi, mi_string, sizeof(ctx->imsi));
#endif
}
/* FIXME: Start some timer */
ctx->mm_state = GMM_COMMON_PROC_INIT;
ctx->tlli = msg->tlli;
break;
case GSM_MI_TYPE_TMSI:
tmsi = strtoul(mi_string, NULL, 10);
/* Try to find MM context based on P-TMSI */
ctx = sgsn_mm_ctx_by_ptmsi(tmsi);
if (!ctx) {
ctx = sgsn_mm_ctx_alloc(msg->tlli, &ra_id);
/* FIXME: Start some timer */
ctx->mm_state = GMM_COMMON_PROC_INIT;
ctx->tlli = msg->tlli;
}
break;
default:
break;
}
/* FIXME: allocate a new P-TMSI (+ P-TMSI signature) */
/* FIXME: update the TLLI with the new local TLLI based on the P-TMSI */
DEBUGPC(DMM, "\n");
return ctx ? gsm48_gmm_authorize(ctx, msg) : 0;
err_inval:
DEBUGPC(DMM, "\n");
return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_SEM_INCORR_MSG);
}
/* Chapter 9.4.15: Routing area update accept */
static int gsm48_tx_gmm_ra_upd_ack(struct msgb *old_msg)
{
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh;
struct gsm48_ra_upd_ack *rua;
DEBUGP(DMM, "<- ROUTING AREA UPDATE ACCEPT\n");
msg->tlli = old_msg->tlli;
msg->trx = old_msg->trx;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_MM_GPRS;
gh->msg_type = GSM48_MT_GMM_RA_UPD_ACK;
rua = (struct gsm48_ra_upd_ack *) msgb_put(msg, sizeof(*rua));
rua->force_stby = 0; /* not indicated */
rua->upd_result = 0; /* RA updated */
rua->ra_upd_timer = GPRS_TMR_MINUTE | 10;
gsm48_ra_id_by_bts(rua->ra_id.digits, old_msg->trx->bts);
/* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */
return gsm48_gmm_sendmsg(msg, 0);
}
/* Chapter 9.4.17: Routing area update reject */
static int gsm48_tx_gmm_ra_upd_rej(struct msgb *old_msg, u_int8_t cause)
{
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh;
DEBUGP(DMM, "<- ROUTING AREA UPDATE REJECT\n");
msg->tlli = old_msg->tlli;
msg->trx = old_msg->trx;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 2);
gh->proto_discr = GSM48_PDISC_MM_GPRS;
gh->msg_type = GSM48_MT_GMM_RA_UPD_REJ;
gh->data[0] = cause;
gh->data[1] = 0; /* ? */
/* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */
return gsm48_gmm_sendmsg(msg, 0);
}
/* Chapter 9.4.14: Routing area update request */
static int gsm48_rx_gmm_ra_upd_req(struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->gmmh;
struct sgsn_mm_ctx *mmctx;
u_int8_t *cur = gh->data;
struct gprs_ra_id old_ra_id;
u_int8_t upd_type;
/* Update Type 10.5.5.18 */
upd_type = *cur++ & 0x0f;
DEBUGP(DMM, "GMM RA UPDATE REQUEST type=\"%s\" ", upd_name(upd_type));
/* Old routing area identification 10.5.5.15 */
gsm48_parse_ra(&old_ra_id, cur);
cur += 6;
/* MS Radio Access Capability 10.5.5.12a */
/* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status,
* DRX parameter, MS network capability */
switch (upd_type) {
case GPRS_UPD_T_RA_LA:
case GPRS_UPD_T_RA_LA_IMSI_ATT:
DEBUGPC(DMM, " unsupported in Mode III, is your SI13 corrupt?\n");
return gsm48_tx_gmm_ra_upd_rej(msg, GMM_CAUSE_PROTO_ERR_UNSPEC);
break;
case GPRS_UPD_T_RA:
case GPRS_UPD_T_PERIODIC:
break;
}
/* Look-up the MM context based on old RA-ID and TLLI */
mmctx = sgsn_mm_ctx_by_tlli(msg->tlli, &old_ra_id);
if (!mmctx || mmctx->mm_state == GMM_DEREGISTERED) {
/* The MS has to perform GPRS attach */
DEBUGPC(DMM, " REJECT\n");
return gsm48_tx_gmm_ra_upd_rej(msg, GMM_CAUSE_IMPL_DETACHED);
}
/* FIXME: Update the MM context with the new RA-ID */
/* FIXME: Update the MM context with the new TLLI */
/* FIXME: Update the MM context with the MS radio acc capabilities */
/* FIXME: Update the MM context with the MS network capabilities */
DEBUGPC(DMM, " ACCEPT\n");
return gsm48_tx_gmm_ra_upd_ack(msg);
}
static int gsm48_rx_gmm_status(struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
DEBUGP(DMM, "GPRS MM STATUS (cause: %s)\n",
get_value_string(gmm_cause_names, gh->data[0]));
return 0;
}
/* GPRS Mobility Management */
static int gsm0408_rcv_gmm(struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->gmmh;
int rc;
switch (gh->msg_type) {
case GSM48_MT_GMM_RA_UPD_REQ:
rc = gsm48_rx_gmm_ra_upd_req(msg);
break;
case GSM48_MT_GMM_ATTACH_REQ:
rc = gsm48_rx_gmm_att_req(msg);
break;
case GSM48_MT_GMM_ID_RESP:
rc = gsm48_rx_gmm_id_resp(msg);
break;
case GSM48_MT_GMM_STATUS:
rc = gsm48_rx_gmm_status(msg);
break;
case GSM48_MT_GMM_RA_UPD_COMPL:
/* only in case SGSN offered new P-TMSI */
case GSM48_MT_GMM_ATTACH_COMPL:
/* only in case SGSN offered new P-TMSI */
case GSM48_MT_GMM_DETACH_REQ:
case GSM48_MT_GMM_PTMSI_REALL_COMPL:
case GSM48_MT_GMM_AUTH_CIPH_RESP:
DEBUGP(DMM, "Unimplemented GSM 04.08 GMM msg type 0x%02x\n",
gh->msg_type);
break;
default:
DEBUGP(DMM, "Unknown GSM 04.08 GMM msg type 0x%02x\n",
gh->msg_type);
break;
}
return rc;
}
/* Section 9.5.2: Ativate PDP Context Accept */
static int gsm48_tx_gsm_act_pdp_acc(struct msgb *old_msg, struct gsm48_act_pdp_ctx_req *req)
{
struct gsm48_hdr *old_gh = (struct gsm48_hdr *) old_msg->gmmh;
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_act_pdp_ctx_ack *act_ack;
struct gsm48_hdr *gh;
u_int8_t transaction_id = ((old_gh->proto_discr >> 4) ^ 0x8); /* flip */
DEBUGP(DMM, "<- ACTIVATE PDP CONTEXT ACK\n");
msg->tlli = old_msg->tlli;
msg->trx = old_msg->trx;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
gh->msg_type = GSM48_MT_GSM_ACT_PDP_ACK;
act_ack = (struct gsm48_act_pdp_ctx_ack *)
msgb_put(msg, sizeof(*act_ack));
act_ack->llc_sapi = req->req_llc_sapi;
memcpy(act_ack->qos_lv, req->req_qos_lv, sizeof(act_ack->qos_lv));
//act_ack->radio_prio = 4;
return gsm48_gmm_sendmsg(msg, 0);
}
/* Section 9.5.9: Deactivate PDP Context Accept */
static int gsm48_tx_gsm_deact_pdp_acc(struct msgb *old_msg)
{
struct gsm48_hdr *old_gh = (struct gsm48_hdr *) old_msg->gmmh;
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh;
u_int8_t transaction_id = ((old_gh->proto_discr >> 4) ^ 0x8); /* flip */
DEBUGP(DMM, "<- DEACTIVATE PDP CONTEXT ACK\n");
msg->tlli = old_msg->tlli;
msg->trx = old_msg->trx;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
gh->msg_type = GSM48_MT_GSM_DEACT_PDP_ACK;
return gsm48_gmm_sendmsg(msg, 0);
}
/* Section 9.5.1: Activate PDP Context Request */
static int gsm48_rx_gsm_act_pdp_req(struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->gmmh;
struct gsm48_act_pdp_ctx_req *act_req = (struct gsm48_act_pdp_ctx_req *) gh->data;
u_int8_t *pdp_addr_lv = act_req->data;
DEBUGP(DMM, "ACTIVATE PDP CONTEXT REQ\n");
/* FIXME: parse access point name + IPCP config options */
return gsm48_tx_gsm_act_pdp_acc(msg, act_req);
}
/* Section 9.5.8: Deactivate PDP Context Request */
static int gsm48_rx_gsm_deact_pdp_req(struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->gmmh;
DEBUGP(DMM, "DEACTIVATE PDP CONTEXT REQ (cause: %s)\n",
get_value_string(gsm_cause_names, gh->data[0]));
return gsm48_tx_gsm_deact_pdp_acc(msg);
}
static int gsm48_rx_gsm_status(struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
DEBUGP(DMM, "GPRS SM STATUS (cause: %s)\n",
get_value_string(gsm_cause_names, gh->data[0]));
return 0;
}
/* GPRS Session Management */
static int gsm0408_rcv_gsm(struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->gmmh;
int rc;
switch (gh->msg_type) {
case GSM48_MT_GSM_ACT_PDP_REQ:
rc = gsm48_rx_gsm_act_pdp_req(msg);
break;
case GSM48_MT_GSM_DEACT_PDP_REQ:
rc = gsm48_rx_gsm_deact_pdp_req(msg);
case GSM48_MT_GSM_STATUS:
rc = gsm48_rx_gsm_status(msg);
break;
case GSM48_MT_GSM_REQ_PDP_ACT_REJ:
case GSM48_MT_GSM_ACT_AA_PDP_REQ:
case GSM48_MT_GSM_DEACT_AA_PDP_REQ:
DEBUGP(DMM, "Unimplemented GSM 04.08 GSM msg type 0x%02x\n",
gh->msg_type);
break;
default:
DEBUGP(DMM, "Unknown GSM 04.08 GSM msg type 0x%02x\n",
gh->msg_type);
break;
}
return rc;
}
/* Main entry point for incoming 04.08 GPRS messages */
int gsm0408_gprs_rcvmsg(struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->gmmh;
u_int8_t pdisc = gh->proto_discr & 0x0f;
int rc = -EINVAL;
switch (pdisc) {
case GSM48_PDISC_MM_GPRS:
rc = gsm0408_rcv_gmm(msg);
break;
case GSM48_PDISC_SM_GPRS:
rc = gsm0408_rcv_gsm(msg);
break;
default:
DEBUGP(DMM, "Unknown GSM 04.08 discriminator 0x%02x\n",
pdisc);
break;
}
return rc;
}
/* Determine the 'struct gsm_bts' from a RA ID */
struct gsm_bts *gsm48_bts_by_ra_id(struct gsm_network *net,
const u_int8_t *buf, unsigned int len)
{
struct gprs_ra_id raid;
struct gsm_bts *bts;
if (len < 6)
return NULL;
gsm48_parse_ra(&raid, buf);
if (net->country_code != raid.mcc ||
net->network_code != raid.mnc)
return NULL;
llist_for_each_entry(bts, &net->bts_list, list) {
/* FIXME: we actually also need to check the
* routing area code! */
if (bts->location_area_code == raid.lac)
return bts;
}
return NULL;
}

112
openbsc/src/input/ipaccess.c
View File

@ -53,6 +53,7 @@
struct ia_e1_handle {
struct bsc_fd listen_fd;
struct bsc_fd rsl_listen_fd;
struct bsc_fd gprs_fd;
struct gsm_network *gsmnet;
};
@ -602,6 +603,87 @@ static int ipaccess_fd_cb(struct bsc_fd *bfd, unsigned int what)
return rc;
}
/* declare this as a weak symbol to ensure code will still build
* even if it does not provide this function */
extern int gprs_ns_rcvmsg(struct msgb *msg) __attribute__((weak));
static struct msgb *read_gprs_msg(struct bsc_fd *bfd, int *error)
{
struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE, "Abis/IP/GPRS");
int ret = 0;
if (!msg) {
*error = -ENOMEM;
return NULL;
}
ret = recv(bfd->fd, msg->data, TS1_ALLOC_SIZE, 0);
if (ret < 0) {
fprintf(stderr, "recv error %s\n", strerror(errno));
msgb_free(msg);
*error = ret;
return NULL;
} else if (ret == 0) {
msgb_free(msg);
*error = ret;
return NULL;
}
msg->l2h = msg->data;
msgb_put(msg, ret);
return msg;
}
static int handle_gprs_read(struct bsc_fd *bfd)
{
int error;
struct msgb *msg = read_gprs_msg(bfd, &error);
if (!msg)
return error;
if (gprs_ns_rcvmsg)
return gprs_ns_rcvmsg(msg);
else {
msgb_free(msg);
return 0;
}
}
static int handle_gprs_write(struct bsc_fd *bfd)
{
}
int ipac_gprs_send(struct msgb *msg)
{
struct sockaddr_in sin;
int rc;
sin.sin_family = AF_INET;
inet_aton("192.168.100.111", &sin.sin_addr);
sin.sin_port = htons(23000);
rc = sendto(e1h->gprs_fd.fd, msg->data, msg->len, 0,
(struct sockaddr *)&sin, sizeof(sin));
talloc_free(msg);
return rc;
}
/* UDP Port 23000 carries the LLC-in-BSSGP-in-NS protocol stack */
static int gprs_fd_cb(struct bsc_fd *bfd, unsigned int what)
{
int rc;
if (what & BSC_FD_READ)
rc = handle_gprs_read(bfd);
if (what & BSC_FD_WRITE)
rc = handle_gprs_write(bfd);
return rc;
}
struct e1inp_driver ipaccess_driver = {
.name = "ip.access",
@ -708,13 +790,17 @@ static int rsl_listen_fd_cb(struct bsc_fd *listen_bfd, unsigned int what)
return 0;
}
static int make_sock(struct bsc_fd *bfd, u_int16_t port,
static int make_sock(struct bsc_fd *bfd, int proto, u_int16_t port,
int (*cb)(struct bsc_fd *fd, unsigned int what))
{
struct sockaddr_in addr;
int ret, on = 1;
int type = SOCK_STREAM;
if (proto == IPPROTO_UDP)
type = SOCK_DGRAM;
bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
bfd->fd = socket(AF_INET, type, proto);
bfd->cb = cb;
bfd->when = BSC_FD_READ;
//bfd->data = line;
@ -739,11 +825,12 @@ static int make_sock(struct bsc_fd *bfd, u_int16_t port,
return -EIO;
}
ret = listen(bfd->fd, 1);
if (ret < 0) {
perror("listen");
close(bfd->fd);
return ret;
if (proto != IPPROTO_UDP) {
ret = listen(bfd->fd, 1);
if (ret < 0) {
perror("listen");
return ret;
}
}
ret = bsc_register_fd(bfd);
@ -811,12 +898,19 @@ int ipaccess_setup(struct gsm_network *gsmnet)
e1h->gsmnet = gsmnet;
/* Listen for OML connections */
ret = make_sock(&e1h->listen_fd, IPA_TCP_PORT_OML, listen_fd_cb);
ret = make_sock(&e1h->listen_fd, IPPROTO_TCP, IPA_TCP_PORT_OML,
listen_fd_cb);
if (ret < 0)
return ret;
/* Listen for RSL connections */
ret = make_sock(&e1h->rsl_listen_fd, IPA_TCP_PORT_RSL, rsl_listen_fd_cb);
ret = make_sock(&e1h->rsl_listen_fd, IPPROTO_TCP,
IPA_TCP_PORT_RSL, rsl_listen_fd_cb);
if (ret < 0)
return ret;
/* Listen for incoming GPRS packets */
ret = make_sock(&e1h->gprs_fd, IPPROTO_UDP, 23000, gprs_fd_cb);
return ret;
}

2
openbsc/src/vty_interface_cmds.c
View File

@ -142,7 +142,7 @@ DEFUN(logging_prnt_timestamp,
}
/* FIXME: those have to be kept in sync with the log levels and categories */
#define VTY_DEBUG_CATEGORIES "(rll|cc|mm|rr|rsl|nm|sms|pag|mncc|inp|mi|mib|mux|meas|sccp|msc|mgcp|ho|db|ref)"
#define VTY_DEBUG_CATEGORIES "(rll|cc|mm|rr|rsl|nm|sms|pag|mncc|inp|mi|mib|mux|meas|sccp|msc|mgcp|ho|db|ref|gprs)"
#define VTY_DEBUG_LEVELS "(everything|debug|info|notice|error|fatal)"
DEFUN(logging_level,
logging_level_cmd,