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#pragma once
/* B-channel handler management. Handles registration of and routing to
* various potentially registered B-channel handlers / routes
* (C) 2022 by Harald Welte <laforge@gnumonks.org>
* SPDX-License-Identifier: GPL-2.0-or-later
#include <stdint.h>
#include <osmocom/core/linuxlist.h>
#include "capi_misc_defs.h"
enum log_subsys {
extern void *g_ctx;
struct capi_connection;
struct bchan_handler_cfg {
/* B1/B2/B3 protocol used in CAPI CONNECT_RESP */
struct {
uint16_t b1;
uint16_t b2;
uint16_t b3;
} proto;
const uint8_t *ncpi;
uint32_t max_b_data_blocks;
uint32_t max_b_data_len;
struct call_state;
/* call-back functions (operations) for a B-channel handler */
struct bchan_handler_ops {
/* initialize whatever handler-private state (call setup) */
int (*init)(struct call_state *cst);
/* receive data (ISDN -> handler) */
void (*rx_data)(struct call_state *cst, const uint8_t *data, size_t len);
/* destroy whatever handler-private state (call teardown) */
void (*fini)(struct call_state *cst);
/* The actual B-channel handler: list/name/config/ops */
struct bchan_handler {
struct llist_head list;
/* name of this handler / application */
const char *name;
/* CAPI related configuration */
struct bchan_handler_cfg cfg;
struct bchan_handler_ops ops;
/* handler private data */
void *priv;
/* representation of one given call within a specific bchan-handler */
struct call_state {
/* back-pointer to handler */
struct bchan_handler *bch;
/* capiconn.h state */
struct capi_connection *cc;
/* per-call private state (return value of bchan_handler.init) */
void *priv;
/* a route for routing incoming calls to a bchan-handler */
struct bchan_route {
/* global list of bchan_routes */
struct llist_head list;
int cip; /* -1: accept any CIP */
const char *msn; /* NULL: accept any MSN / called number */
struct bchan_handler *hdlr; /* handler for this CIP/MSN */
struct bchan_handler *bchan_handler_find(const char *name);
void bchan_handler_register(struct bchan_handler *hdlr);
void bchan_route_add(int cip, const char *msn, const char *hdlr_name);
struct bchan_handler *bchan_handler_for_call(uint16_t cip, const char *msn);
int bchan_call_tx(struct call_state *cst, const uint8_t *data, size_t len);