sccp_sap.h

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#pragma once

/* SCCP User SAP description */

/* (C) 2015-2017 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include <stdint.h>
#include <osmocom/core/prim.h>
#include <osmocom/sigtran/sigtran_sap.h>

#include <netinet/in.h>

/* detailed coding of primitives at the SAP_SCCP_USER */

enum osmo_scu_prim_type {
        /* connection oriented, 6.1.1 */
        OSMO_SCU_PRIM_N_CONNECT,
        OSMO_SCU_PRIM_N_DATA,
        OSMO_SCU_PRIM_N_EXPEDITED_DATA,
        OSMO_SCU_PRIM_N_DISCONNECT,
        OSMO_SCU_PRIM_N_RESET,
        OSMO_SCU_PRIM_N_INFORM,
        /* connectionless, 6.2.2 */
        OSMO_SCU_PRIM_N_UNITDATA,
        OSMO_SCU_PRIM_N_NOTICE,
        /* management */
        OSMO_SCU_PRIM_N_COORD,
        OSMO_SCU_PRIM_N_STATE,
        OSMO_SCU_PRIM_N_PCSTATE,
};

#define OSMO_SCCP_ADDR_T_GT     0x0001 /* global title */
#define OSMO_SCCP_ADDR_T_PC     0x0002 /* signalling point code */
#define OSMO_SCCP_ADDR_T_SSN    0x0004 /* subsystem number */
#define OSMO_SCCP_ADDR_T_IPv4   0x0008
#define OSMO_SCCP_ADDR_T_IPv6   0x0010
#define OSMO_SCCP_ADDR_T_MASK   0x001f

/* Q.713 3.4.1 + RFC 3868 3.10.2.3 */
enum osmo_sccp_routing_ind {
        OSMO_SCCP_RI_NONE,
        OSMO_SCCP_RI_GT,
        OSMO_SCCP_RI_SSN_PC,
        OSMO_SCCP_RI_SSN_IP,
};

extern const struct value_string osmo_sccp_routing_ind_names[];
static inline const char *osmo_sccp_routing_ind_name(enum osmo_sccp_routing_ind val)
{ return get_value_string(osmo_sccp_routing_ind_names, val); }


/* Q.713 3.4.1 + RFC 3868 3.10.2.3 */
enum osmo_sccp_gti {
        OSMO_SCCP_GTI_NO_GT,
        OSMO_SCCP_GTI_NAI_ONLY,
        OSMO_SCCP_GTI_TT_ONLY,
        OSMO_SCCP_GTI_TT_NPL_ENC,
        OSMO_SCCP_GTI_TT_NPL_ENC_NAI,
};

extern const struct value_string osmo_sccp_gti_names[];
static inline const char *osmo_sccp_gti_name(enum osmo_sccp_gti val)
{ return get_value_string(osmo_sccp_gti_names, val); }

/* RFC 3868 3.10.2.3 */
enum osmo_sccp_npi {
        OSMO_SCCP_NPI_UNKNOWN = 0,
        OSMO_SCCP_NPI_E164_ISDN         = 1,
        OSMO_SCCP_NPI_GEERIC            = 2,
        OSMO_SCCP_NPI_X121_DATA         = 3,
        OSMO_SCCP_NPI_F69_TELEX         = 4,
        OSMO_SCCP_NPI_E210_MARITIME     = 5,
        OSMO_SCCP_NPI_E212_LAND         = 6,
        OSMO_SCCP_NPI_E214_ISDN_MOBILE  = 7,
        OSMO_SCCP_NPI_PRIVATE           = 14,
};

/* Q.713 3.4.2.3.1 + RFC 3868 3.10.2.3 */
enum osmo_sccp_nai {
        OSMO_SCCP_NAI_UNKNOWN           = 0,
        OSMO_SCCP_NAI_SUBSCR            = 1,
        OSMO_SCCP_NAI_RES_NAT_USE       = 2,
        OSMO_SCCP_NAI_NATL              = 3,
        OSMO_SCCP_NAI_INTL              = 4,
        /* 5.. 255: Spare */
};

/* Q.713 3.4.2.2 */
enum osmo_sccp_ssn {
        /* globally standardised for GSM/UMTS: 1-31 */
        OSMO_SCCP_SSN_MGMT              = 1,
        OSMO_SCCP_SSN_ISUP              = 3,
        OSMO_SCCP_SSN_OMAP              = 4,
        OSMO_SCCP_SSN_MAP               = 5,
        OSMO_SCCP_SSN_HLR               = 6,
        OSMO_SCCP_SSN_VLR               = 7,
        OSMO_SCCP_SSN_MSC               = 8,
        OSMO_SCCP_SSN_EIR               = 9,
        OSMO_SCCP_SSN_AUC               = 0x0a,
        /* Q.713 */
        OSMO_SCCP_SSN_ISDN_SS           = 0x0b,
        OSMO_SCCP_SSN_RES_INTL          = 0x0c,
        OSMO_SCCP_SSN_BISDN             = 0x0d,
        OSMO_SCCP_SSN_TC_TEST           = 0x0e,
        /* national network SSN for wihin and between GSM/UMTS: 129-150 */
        OSMO_SCCP_SSN_RANAP             = 142,
        OSMO_SCCP_SSN_RNSAP             = 143,
        OSMO_SCCP_SSN_GMLC_MAP          = 145,
        OSMO_SCCP_SSN_CAP               = 146,
        OSMO_SCCP_SSN_gsmSCF_MAP        = 147,
        OSMO_SCCP_SSN_SIWF_MAP          = 148,
        OSMO_SCCP_SSN_SGSN_MAP          = 149,
        OSMO_SCCP_SSN_GGSN_MAP          = 150,
        /* national network SSN within GSM/UMTS: 32-128 + 151-254 */
        OSMO_SCCP_SSN_PCAP              = 249,
        OSMO_SCCP_SSN_BSC_BSSAP_LE      = 250,
        OSMO_SCCP_SSN_MSC_BSSAP_LE      = 251,
        OSMO_SCCP_SSN_SMLC_BSSAP_LE     = 252,
        OSMO_SCCP_SSN_BSS_OAM           = 253,
        OSMO_SCCP_SSN_BSSAP             = 254,
};

/* Q.711 6.3.2.2.5 Signalling point status */
enum osmo_sccp_sp_status {
        OSMO_SCCP_SP_S_INACCESSIBLE     = 1,
        OSMO_SCCP_SP_S_CONGESTED        = 2,
        OSMO_SCCP_SP_S_ACCESSIBLE       = 3,
};
/* Q.711 6.3.2.2.6 Remote SCCP status */
enum osmo_sccp_rem_sccp_status {
        OSMO_SCCP_REM_SCCP_S_AVAILABLE                  = 1,
        OSMO_SCCP_REM_SCCP_S_UNAVAILABLE_UNKNOWN        = 2,
        OSMO_SCCP_REM_SCCP_S_UNEQUIPPED                 = 3,
        OSMO_SCCP_REM_SCCP_S_INACCESSIBLE               = 4,
        OSMO_SCCP_REM_SCCP_S_CONGESTED                  = 5,
};

/* legacy shim for name change */
#define OSMO_SCCP_SSN_SMLC_BSSAP OSMO_SCCP_SSN_SMLC_BSSAP_LE

extern const struct value_string osmo_sccp_ssn_names[];
static inline const char *osmo_sccp_ssn_name(enum osmo_sccp_ssn val)
{ return get_value_string(osmo_sccp_ssn_names, val); }

struct osmo_sccp_gt {
        uint8_t gti;
        uint8_t tt;
        uint32_t npi;
        uint32_t nai;
        char digits[32];
};

struct osmo_sccp_addr {
        uint32_t presence;
        enum osmo_sccp_routing_ind ri;
        struct osmo_sccp_gt gt;
        uint32_t pc;
        uint32_t ssn;
        union {
                struct in_addr v4;
                struct in6_addr v6;
        } ip;
        /* we don't do hostnames */
};

/* OSMO_SCU_PRIM_N_CONNECT */
struct osmo_scu_connect_param {
        struct osmo_sccp_addr called_addr;
        struct osmo_sccp_addr calling_addr;
        struct osmo_sccp_addr responding_addr;
        //struct osmo_sccp_qos_pars qos_pars;
        uint32_t sccp_class;
        uint32_t importance;
        uint32_t conn_id;
        /* user data */
};

/* OSMO_SCU_PRIM_N_DATA / OSMO_SCU_PRIM_N_EXPEDITED_DATA */
struct osmo_scu_data_param {
        uint32_t conn_id;
        uint32_t importance;
        /* user data */
};

enum osmo_sccp_originator {
        OSMO_SCCP_ORIG_NS_PROVIDER,
        OSMO_SCCP_ORIG_NS_USER,
        OSMO_SCCP_ORIG_UNDEFINED,
};

/* OSMO_SCU_PRIM_N_DISCONNECT */
struct osmo_scu_disconn_param {
        enum osmo_sccp_originator originator;
        struct osmo_sccp_addr responding_addr;
        uint32_t cause;
        uint32_t conn_id;
        uint32_t importance;
        /* user data */
};

/* OSMO_SCU_PRIM_N_RESET */
struct osmo_scu_reset_param {
        enum osmo_sccp_originator originator;
        uint32_t cause;
        uint32_t conn_id;
};

/* OSMO_SCU_PRIM_N_UNITDATA */
struct osmo_scu_unitdata_param {
        struct osmo_sccp_addr called_addr;
        struct osmo_sccp_addr calling_addr;
        uint32_t in_sequence_control;
        uint32_t return_option;
        uint32_t importance;
        /* user data */
};

/* OSMO_SCU_PRIM_N_NOTICE */
struct osmo_scu_notice_param {
        struct osmo_sccp_addr called_addr;
        struct osmo_sccp_addr calling_addr;
        uint32_t cause;
        uint32_t importance;
        /* user data */
};

/* OSMO_SCU_PRIM_N_STATE */
struct osmo_scu_state_param {
        uint32_t affected_pc;
        uint32_t affected_ssn;
        bool user_in_service; /* true: UIS; false: UOS */
        uint32_t ssn_multiplicity_ind;
};

/* OSMO_ASCU_PRIM_N_PCSTATE */
struct osmo_scu_pcstate_param {
        uint32_t affected_pc;
        uint32_t restricted_importance_level;
        enum osmo_sccp_sp_status sp_status;
        enum osmo_sccp_rem_sccp_status remote_sccp_status;
};

struct osmo_scu_prim {
        struct osmo_prim_hdr oph;
        union {
                struct osmo_scu_connect_param connect;
                struct osmo_scu_data_param data;
                struct osmo_scu_disconn_param disconnect;
                struct osmo_scu_reset_param reset;
                struct osmo_scu_unitdata_param unitdata;
                struct osmo_scu_notice_param notice;
                struct osmo_scu_state_param state;
                struct osmo_scu_pcstate_param pcstate;
        } u;
};

#define msgb_scu_prim(msg) ((struct osmo_scu_prim *)(msg)->l1h)

char *osmo_scu_prim_name(const struct osmo_prim_hdr *oph);

struct osmo_ss7_instance;
struct osmo_sccp_instance;
struct osmo_sccp_user;

void osmo_sccp_vty_init(void);

struct osmo_sccp_instance *osmo_sccp_instance_create(struct osmo_ss7_instance *ss7, void *priv);
void osmo_sccp_instance_destroy(struct osmo_sccp_instance *inst);
struct osmo_ss7_instance *osmo_sccp_get_ss7(const struct osmo_sccp_instance *sccp);
struct osmo_sccp_instance *osmo_sccp_get_sccp(const struct osmo_sccp_user *scu);

void osmo_sccp_user_unbind(struct osmo_sccp_user *scu);
void osmo_sccp_user_set_priv(struct osmo_sccp_user *scu, void *priv);
void *osmo_sccp_user_get_priv(struct osmo_sccp_user *scu);

struct osmo_sccp_user *osmo_sccp_user_bind_pc(struct osmo_sccp_instance *inst, const char *name,
                                              osmo_prim_cb prim_cb, uint16_t ssn, uint32_t pc);

struct osmo_sccp_user *osmo_sccp_user_bind(struct osmo_sccp_instance *inst, const char *name,
                                           osmo_prim_cb prim_cb, uint16_t ssn);
struct osmo_sccp_user *osmo_sccp_user_find(struct osmo_sccp_instance *inst, uint16_t ssn, uint32_t pc);

int osmo_sccp_user_sap_down(struct osmo_sccp_user *scu, struct osmo_prim_hdr *oph);
int osmo_sccp_user_sap_down_nofree(struct osmo_sccp_user *scu, struct osmo_prim_hdr *oph);

struct osmo_ss7_instance *osmo_sccp_addr_by_name(struct osmo_sccp_addr *dest_addr, const char *name);
int osmo_sccp_addr_by_name_local(struct osmo_sccp_addr *dest_addr, const char *name,
                                 const struct osmo_ss7_instance *inst);

const char *osmo_sccp_name_by_addr(const struct osmo_sccp_addr *addr);

void osmo_sccp_local_addr_by_instance(struct osmo_sccp_addr *dest_addr,
                                      const struct osmo_sccp_instance *inst,
                                      uint32_t ssn);

bool osmo_sccp_check_addr(struct osmo_sccp_addr *addr, uint32_t presence);
int osmo_sccp_addr_cmp(const struct osmo_sccp_addr *a, const struct osmo_sccp_addr *b, uint32_t presence_criteria);
int osmo_sccp_addr_ri_cmp(const struct osmo_sccp_addr *a, const struct osmo_sccp_addr *b);
int osmo_sccp_gt_cmp(const struct osmo_sccp_gt *a, const struct osmo_sccp_gt *b);

const char *osmo_sccp_user_name(struct osmo_sccp_user *scu);