osmo_ss7.h

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#pragma once

#include <stdint.h>
#include <stdbool.h>

#include <osmocom/core/linuxlist.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/fsm.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/prim.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/rate_ctr.h>

extern struct llist_head osmo_ss7_instances;

struct osmo_ss7_instance;
struct osmo_ss7_user;
struct osmo_sccp_instance;
struct osmo_mtp_prim;
struct osmo_xua_layer_manager;

int osmo_ss7_init(void);
int osmo_ss7_find_free_rctx(struct osmo_ss7_instance *inst);

bool osmo_ss7_pc_is_local(struct osmo_ss7_instance *inst, uint32_t pc);
int osmo_ss7_pointcode_parse(struct osmo_ss7_instance *inst, const char *str);
int osmo_ss7_pointcode_parse_mask_or_len(struct osmo_ss7_instance *inst, const char *in);
const char *osmo_ss7_pointcode_print_buf(char *buf, size_t buf_len, const struct osmo_ss7_instance *inst, uint32_t pc);
const char *osmo_ss7_pointcode_print(const struct osmo_ss7_instance *inst, uint32_t pc);
const char *osmo_ss7_pointcode_print2(const struct osmo_ss7_instance *inst, uint32_t pc);

/* All known point-code formats have a length of or below 24 bit.
 * A point-code value exceeding that is used to indicate an unset PC. */
#define OSMO_SS7_PC_INVALID 0xffffffff
static inline bool osmo_ss7_pc_is_valid(uint32_t pc)
{
        return pc <= 0x00ffffff;
}

/***********************************************************************
 * SS7 Routing Tables
 ***********************************************************************/

struct osmo_ss7_route_table {
        struct llist_head list;
        struct osmo_ss7_instance *inst;
        struct llist_head routes;

        struct {
                char *name;
                char *description;
        } cfg;
};

struct osmo_ss7_route_table *
osmo_ss7_route_table_find(struct osmo_ss7_instance *inst, const char *name);
struct osmo_ss7_route_table *
osmo_ss7_route_table_find_or_create(struct osmo_ss7_instance *inst, const char *name);
void osmo_ss7_route_table_destroy(struct osmo_ss7_route_table *rtbl);

/***********************************************************************
 * SS7 Instances
 ***********************************************************************/

struct osmo_ss7_pc_fmt {
        char delimiter;
        uint8_t component_len[3];
};

struct osmo_ss7_instance {
        struct llist_head list;
        struct llist_head linksets;
        struct llist_head as_list;
        struct llist_head asp_list;
        struct llist_head rtable_list;
        struct llist_head xua_servers;
        /* array for faster lookup of user (indexed by service
         * indicator) */
        const struct osmo_ss7_user *user[16];

        struct osmo_ss7_route_table *rtable_system;

        struct osmo_sccp_instance *sccp;

        struct {
                uint32_t id;
                char *name;
                char *description;
                uint32_t primary_pc;
                /* secondary PCs */
                /* capability PCs */
                uint8_t network_indicator;
                struct osmo_ss7_pc_fmt pc_fmt;
                bool permit_dyn_rkm_alloc;
                struct llist_head sccp_address_book;
        } cfg;
};

struct osmo_ss7_instance *osmo_ss7_instance_find(uint32_t id);
struct osmo_ss7_instance *
osmo_ss7_instance_find_or_create(void *ctx, uint32_t id);
void osmo_ss7_instance_destroy(struct osmo_ss7_instance *inst);
int osmo_ss7_instance_set_pc_fmt(struct osmo_ss7_instance *inst,
                                uint8_t c0, uint8_t c1, uint8_t c2);

struct osmo_sccp_instance *osmo_ss7_ensure_sccp(struct osmo_ss7_instance *inst);

uint8_t osmo_ss7_pc_width(const struct osmo_ss7_pc_fmt *pc_fmt);
uint32_t osmo_ss7_pc_normalize(const struct osmo_ss7_pc_fmt *pc_fmt, uint32_t pc);

/***********************************************************************
 * MTP Users (Users of MTP, such as SCCP or ISUP)
 ***********************************************************************/

struct osmo_ss7_user {
        /* pointer back to SS7 instance */
        struct osmo_ss7_instance *inst;
        /* name of the user */
        const char *name;
        /* primitive call-back for incoming MTP primitives */
        osmo_prim_cb prim_cb;
        /* private data */
        void *priv;
};

int osmo_ss7_user_register(struct osmo_ss7_instance *inst, uint8_t service_ind,
                           struct osmo_ss7_user *user);

int osmo_ss7_user_unregister(struct osmo_ss7_instance *inst, uint8_t service_ind,
                             struct osmo_ss7_user *user);

int osmo_ss7_mtp_to_user(struct osmo_ss7_instance *inst, struct osmo_mtp_prim *omp);

/* SS7 User wants to issue MTP-TRANSFER.req */
int osmo_ss7_user_mtp_xfer_req(struct osmo_ss7_instance *inst,
                                struct osmo_mtp_prim *omp);

/***********************************************************************
 * SS7 Links
 ***********************************************************************/

enum osmo_ss7_link_adm_state {
        OSMO_SS7_LS_SHUTDOWN,
        OSMO_SS7_LS_INHIBITED,
        OSMO_SS7_LS_ENABLED,
        _NUM_OSMO_SS7_LS
};

struct osmo_ss7_linkset;
struct osmo_ss7_link;

struct osmo_ss7_link {
        struct osmo_ss7_linkset *linkset;
        struct {
                char *name;
                char *description;
                uint32_t id;

                enum osmo_ss7_link_adm_state adm_state;
        } cfg;
};

void osmo_ss7_link_destroy(struct osmo_ss7_link *link);
struct osmo_ss7_link *
osmo_ss7_link_find_or_create(struct osmo_ss7_linkset *lset, uint32_t id);

/***********************************************************************
 * SS7 Linksets
 ***********************************************************************/

struct osmo_ss7_linkset {
        struct llist_head list;
        struct osmo_ss7_instance *inst;
        struct osmo_ss7_link *links[16];

        struct {
                char *name;
                char *description;
                uint32_t adjacent_pc;
                uint32_t local_pc;
        } cfg;
};

void osmo_ss7_linkset_destroy(struct osmo_ss7_linkset *lset);
struct osmo_ss7_linkset *
osmo_ss7_linkset_find_by_name(struct osmo_ss7_instance *inst, const char *name);
struct osmo_ss7_linkset *
osmo_ss7_linkset_find_or_create(struct osmo_ss7_instance *inst, const char *name, uint32_t pc);


/***********************************************************************
 * SS7 Routes
 ***********************************************************************/

struct osmo_ss7_route {
        struct llist_head list;
        struct osmo_ss7_route_table *rtable;

        struct {
                struct osmo_ss7_linkset *linkset;
                struct osmo_ss7_as *as;
        } dest;

        struct {
                /* FIXME: presence? */
                uint32_t pc;
                uint32_t mask;
                char *linkset_name;
                uint32_t priority;
                uint8_t qos_class;
        } cfg;
};

struct osmo_ss7_route *
osmo_ss7_route_find_dpc(struct osmo_ss7_route_table *rtbl, uint32_t dpc);
struct osmo_ss7_route *
osmo_ss7_route_find_dpc_mask(struct osmo_ss7_route_table *rtbl, uint32_t dpc,
                             uint32_t mask);
struct osmo_ss7_route *
osmo_ss7_route_lookup(struct osmo_ss7_instance *inst, uint32_t dpc);
struct osmo_ss7_route *
osmo_ss7_route_create(struct osmo_ss7_route_table *rtbl, uint32_t dpc,
                        uint32_t mask, const char *linkset_name);
void osmo_ss7_route_destroy(struct osmo_ss7_route *rt);
const char *osmo_ss7_route_print(const struct osmo_ss7_route *rt);
const char *osmo_ss7_route_name(struct osmo_ss7_route *rt, bool list_asps);


/***********************************************************************
 * SS7 Application Servers
 ***********************************************************************/

struct osmo_ss7_routing_key {
        uint32_t context;
        uint32_t l_rk_id;

        uint32_t pc;
        uint8_t si;
        uint32_t ssn;
        /* FIXME: more complex routing keys */
};

enum osmo_ss7_as_traffic_mode {
        OSMO_SS7_AS_TMOD_OVERRIDE = 0,  /* default */
        OSMO_SS7_AS_TMOD_BCAST,
        OSMO_SS7_AS_TMOD_LOADSHARE,
        OSMO_SS7_AS_TMOD_ROUNDROBIN,
        _NUM_OSMO_SS7_ASP_TMOD
};

extern struct value_string osmo_ss7_as_traffic_mode_vals[];

static inline const char *
osmo_ss7_as_traffic_mode_name(enum osmo_ss7_as_traffic_mode mode)
{
        return get_value_string(osmo_ss7_as_traffic_mode_vals, mode);
}

enum osmo_ss7_asp_protocol {
        OSMO_SS7_ASP_PROT_NONE,
        OSMO_SS7_ASP_PROT_SUA,
        OSMO_SS7_ASP_PROT_M3UA,
        OSMO_SS7_ASP_PROT_IPA,
        _NUM_OSMO_SS7_ASP_PROT
};

extern struct value_string osmo_ss7_asp_protocol_vals[];

static inline const char *
osmo_ss7_asp_protocol_name(enum osmo_ss7_asp_protocol mode)
{
        return get_value_string(osmo_ss7_asp_protocol_vals, mode);
}

int osmo_ss7_asp_protocol_port(enum osmo_ss7_asp_protocol prot);

enum osmo_ss7_as_patch_sccp_mode {
        OSMO_SS7_PATCH_NONE,    /* no patching of SCCP */
        OSMO_SS7_PATCH_BOTH,    /* patch both OPC and DPC into SCCP addresses */
};

struct osmo_ss7_as {
        struct llist_head list;
        struct osmo_ss7_instance *inst;

        struct osmo_fsm_inst *fi;

        bool rkm_dyn_allocated;

        bool simple_client_allocated;

        struct rate_ctr_group *ctrg;

        struct {
                char *name;
                char *description;
                enum osmo_ss7_asp_protocol proto;
                struct osmo_ss7_routing_key routing_key;
                enum osmo_ss7_as_traffic_mode mode;
                /* traffic mode was configured by VTY / config file */
                bool mode_set_by_vty;
                /* traffic mode was configured by RKM (routing key management) or first ASPAC */
                bool mode_set_by_peer;
                uint32_t recovery_timeout_msec;
                uint8_t qos_class;
                struct {
                        uint32_t dpc;
                        enum osmo_ss7_as_patch_sccp_mode sccp_mode;
                } pc_override;

                struct osmo_ss7_asp *asps[16];
                uint8_t last_asp_idx_sent; /* used for load-sharing traffic mode (round robin implementation) */
        } cfg;
};

struct osmo_ss7_as *
osmo_ss7_as_find_by_name(struct osmo_ss7_instance *inst, const char *name);
struct osmo_ss7_as *
osmo_ss7_as_find_by_rctx(struct osmo_ss7_instance *inst, uint32_t rctx);
struct osmo_ss7_as *
osmo_ss7_as_find_by_l_rk_id(struct osmo_ss7_instance *inst, uint32_t l_rk_id);
struct osmo_ss7_as *osmo_ss7_as_find_by_proto(struct osmo_ss7_instance *inst,
                                              enum osmo_ss7_asp_protocol proto);
struct osmo_ss7_as *
osmo_ss7_as_find_or_create(struct osmo_ss7_instance *inst, const char *name,
                          enum osmo_ss7_asp_protocol proto);
int osmo_ss7_as_add_asp(struct osmo_ss7_as *as, const char *asp_name);
int osmo_ss7_as_del_asp(struct osmo_ss7_as *as, const char *asp_name);
void osmo_ss7_as_destroy(struct osmo_ss7_as *as);
bool osmo_ss7_as_has_asp(const struct osmo_ss7_as *as,
                         const struct osmo_ss7_asp *asp);
bool osmo_ss7_as_active(const struct osmo_ss7_as *as);
bool osmo_ss7_as_tmode_compatible_xua(struct osmo_ss7_as *as, uint32_t m3ua_tmt);
void osmo_ss7_asp_disconnect(struct osmo_ss7_asp *asp);


/***********************************************************************
 * SS7 Application Server Processes
 ***********************************************************************/

struct osmo_ss7_asp_peer {
        char *host[OSMO_SOCK_MAX_ADDRS];
        size_t host_cnt;
        uint16_t port;
};

enum osmo_ss7_asp_admin_state {
        OSMO_SS7_ASP_ADM_S_SHUTDOWN,
        OSMO_SS7_ASP_ADM_S_BLOCKED,
        OSMO_SS7_ASP_ADM_S_ENABLED,
};

enum osmo_ss7_asp_role {
        OSMO_SS7_ASP_ROLE_ASP,
        OSMO_SS7_ASP_ROLE_SG,
        OSMO_SS7_ASP_ROLE_IPSP,
};

extern const struct value_string osmo_ss7_asp_role_names[];

struct osmo_ss7_asp {
        struct llist_head list;
        struct osmo_ss7_instance *inst;

        struct osmo_fsm_inst *fi;

        struct osmo_xua_server *xua_server;
        struct llist_head siblings;

        struct osmo_stream_cli *client;
        struct osmo_stream_srv *server;
        char *sock_name;

        /* ASP Identifier for ASP-UP + NTFY */
        uint32_t asp_id;
        bool asp_id_present;

        /* Layer Manager to which we talk */
        const struct osmo_xua_layer_manager *lm;
        void *lm_priv;

        bool dyn_allocated;

        bool simple_client_allocated;

        struct rate_ctr_group *ctrg;

        struct msgb *pending_msg;

        struct {
                char *name;
                char *description;
                enum osmo_ss7_asp_protocol proto;
                enum osmo_ss7_asp_admin_state adm_state;
                bool is_server;
                enum osmo_ss7_asp_role role;
                bool role_set_by_vty;

                struct osmo_ss7_asp_peer local;
                struct osmo_ss7_asp_peer remote;
                uint8_t qos_class;
                uint32_t quirks;
        } cfg;
};

#define OSMO_SS7_ASP_QUIRK_NO_NOTIFY            0x00000001

#define OSMO_SS7_ASP_QUIRK_DAUD_IN_ASP          0x00000002

#define OSMO_SS7_ASP_QUIRK_SNM_INACTIVE         0x00000004

int osmo_ss7_asp_peer_snprintf(char* buf, size_t buf_len, struct osmo_ss7_asp_peer *peer);
int osmo_ss7_asp_peer_set_hosts(struct osmo_ss7_asp_peer *peer, void *talloc_ctx,
                                const char* const* hosts, size_t host_cnt);
int osmo_ss7_asp_peer_add_host(struct osmo_ss7_asp_peer *peer, void *talloc_ctx, const char *host);

struct osmo_ss7_asp *
osmo_ss7_asp_find_by_name(struct osmo_ss7_instance *inst, const char *name);
struct osmo_ss7_asp
*osmo_ss7_asp_find_by_proto(struct osmo_ss7_as *as,
                            enum osmo_ss7_asp_protocol proto);
struct osmo_ss7_asp *
osmo_ss7_asp_find(struct osmo_ss7_instance *inst, const char *name,
                  uint16_t remote_port, uint16_t local_port,
                  enum osmo_ss7_asp_protocol proto);
struct osmo_ss7_asp *
osmo_ss7_asp_find_or_create(struct osmo_ss7_instance *inst, const char *name,
                            uint16_t remote_port, uint16_t local_port,
                            enum osmo_ss7_asp_protocol proto);
void osmo_ss7_asp_destroy(struct osmo_ss7_asp *asp);
int osmo_ss7_asp_send(struct osmo_ss7_asp *asp, struct msgb *msg);
int osmo_ss7_asp_restart(struct osmo_ss7_asp *asp);
int osmo_ss7_asp_use_default_lm(struct osmo_ss7_asp *asp, int log_level);
bool osmo_ss7_asp_active(const struct osmo_ss7_asp *asp);
int osmo_ss7_asp_get_log_subsys(const struct osmo_ss7_asp *asp);

typedef int osmo_ss7_asp_rx_unknown_cb(struct osmo_ss7_asp *asp, int ppid_mux, struct msgb *msg);

void osmo_ss7_register_rx_unknown_cb(osmo_ss7_asp_rx_unknown_cb *cb);

#define _LOGSS7(inst, subsys, level, fmt, args ...)      \
        LOGP(subsys, level, "%u: " fmt, inst ? (inst)->cfg.id : 0, ## args)
#define LOGSS7(inst, level, fmt, args ...)      _LOGSS7(inst, DLSS7, level, fmt, ## args)

#define LOGPASP(asp, subsys, level, fmt, args ...)              \
        _LOGSS7((asp)->inst, subsys, level, "asp-%s: " fmt, (asp)->cfg.name, ## args)
#define LOGPAS(as, subsys, level, fmt, args ...)                \
        _LOGSS7((as)->inst, subsys, level, "as-%s: " fmt, (as)->cfg.name, ## args)

/***********************************************************************
 * xUA Servers
 ***********************************************************************/

struct osmo_xua_layer_manager {
        osmo_prim_cb prim_cb;
};

struct osmo_xua_server {
        struct llist_head list;
        struct osmo_ss7_instance *inst;

        /* list of ASPs established via this server */
        struct llist_head asp_list;

        struct osmo_stream_srv_link *server;

        struct {
                bool accept_dyn_reg;
                struct osmo_ss7_asp_peer local;
                enum osmo_ss7_asp_protocol proto;
        } cfg;
};

struct osmo_xua_server *
osmo_ss7_xua_server_find(struct osmo_ss7_instance *inst, enum osmo_ss7_asp_protocol proto,
                         uint16_t local_port);

struct osmo_xua_server *
osmo_ss7_xua_server_create(struct osmo_ss7_instance *inst, enum osmo_ss7_asp_protocol proto,
                           uint16_t local_port, const char *local_host);

int
osmo_ss7_xua_server_bind(struct osmo_xua_server *xs);

int
osmo_ss7_xua_server_set_local_host(struct osmo_xua_server *xs, const char *local_host);
int
osmo_ss7_xua_server_set_local_hosts(struct osmo_xua_server *xs, const char **local_hosts, size_t local_host_cnt);
int osmo_ss7_xua_server_add_local_host(struct osmo_xua_server *xs, const char *local_host);
void osmo_ss7_xua_server_destroy(struct osmo_xua_server *xs);

struct osmo_sccp_instance *
osmo_sccp_simple_client(void *ctx, const char *name, uint32_t default_pc,
                        enum osmo_ss7_asp_protocol prot, int default_local_port,
                        const char *default_local_ip, int default_remote_port,
                        const char *default_remote_ip);

struct osmo_sccp_instance *
osmo_sccp_simple_client_on_ss7_id(void *ctx, uint32_t ss7_id, const char *name,
                                  uint32_t default_pc,
                                  enum osmo_ss7_asp_protocol prot,
                                  int default_local_port,
                                  const char *default_local_ip,
                                  int default_remote_port,
                                  const char *default_remote_ip);

struct osmo_sccp_instance *
osmo_sccp_simple_server(void *ctx, uint32_t pc,
                        enum osmo_ss7_asp_protocol prot, int local_port,
                        const char *local_ip);

struct osmo_sccp_instance *
osmo_sccp_simple_server_on_ss7_id(void *ctx, uint32_t ss7_id, uint32_t pc,
                                  enum osmo_ss7_asp_protocol prot,
                                  int local_port, const char *local_ip);

struct osmo_sccp_instance *
osmo_sccp_simple_server_add_clnt(struct osmo_sccp_instance *inst,
                                 enum osmo_ss7_asp_protocol prot,
                                 const char *name, uint32_t pc,
                                 int local_port, int remote_port,
                                 const char *remote_ip);

enum osmo_ss7_as_traffic_mode osmo_ss7_tmode_from_xua(uint32_t in);
int osmo_ss7_tmode_to_xua(enum osmo_ss7_as_traffic_mode tmod);

/* VTY related */
struct vty;
void osmo_ss7_vty_init_asp(void *ctx);
void osmo_ss7_vty_init_sg(void *ctx);
int osmo_ss7_vty_go_parent(struct vty *vty);
int osmo_ss7_is_config_node(struct vty *vty, int node);