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libosmo-sccp/src/sccp_user.c

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/* SCCP User related routines */
/* (C) 2017 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* based on my 2011 Erlang implementation osmo_ss7/src/sua_sccp_conv.erl
*
* References: ITU-T Q.713 and IETF RFC 3868
*
* 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 <stdbool.h>
#include <string.h>
#include <limits.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/logging.h>
#include <osmocom/sigtran/osmo_ss7.h>
#include <osmocom/sigtran/sccp_sap.h>
#include <osmocom/sigtran/mtp_sap.h>
#include <osmocom/sigtran/protocol/mtp.h>
#include <osmocom/sigtran/sccp_helpers.h>
#include "sccp_internal.h"
#include "xua_internal.h"
#include "ss7_internal.h"
/*! \brief Find a SCCP User registered for given PC+SSN or SSN only
* First search all users with a valid PC for a full PC+SSN match.
* If no such match was found, search all users with an invalid PC for an SSN-only match.
* \param[in] inst SCCP Instance in which to search
* \param[in] ssn Sub-System Number to search for
* \param[in] pc Point Code to search for
* \returns Matching SCCP User; NULL if none found */
struct osmo_sccp_user *
sccp_user_find(struct osmo_sccp_instance *inst, uint16_t ssn, uint32_t pc)
{
struct osmo_sccp_user *scu;
if (osmo_ss7_pc_is_valid(pc)) {
/* First try to find match for PC + SSN */
llist_for_each_entry(scu, &inst->users, list) {
if (osmo_ss7_pc_is_valid(scu->pc) && scu->pc == pc && scu->ssn == ssn)
return scu;
}
}
/* Then try to match on SSN only */
llist_for_each_entry(scu, &inst->users, list) {
if (!osmo_ss7_pc_is_valid(scu->pc) && scu->ssn == ssn)
return scu;
}
return NULL;
}
/*! Find a SCCP User registered for given PC+SSN or SSN only.
* First search all users with a valid PC for a full PC+SSN match.
* If no match was found, search all users with an invalid PC for an SSN-only match.
* \param[in] inst SCCP Instance in which to search.
* \param[in] ssn Sub-System Number to search for.
* \param[in] pc Point Code to search for.
* \returns Matching SCCP User; NULL if none found.
*/
struct osmo_sccp_user *
osmo_sccp_user_find(struct osmo_sccp_instance *inst, uint16_t ssn, uint32_t pc)
{
return sccp_user_find(inst, ssn, pc);
}
/*! \brief Bind a SCCP User to a given Point Code
* \param[in] inst SCCP Instance
* \param[in] name human-readable name
* \param[in] ssn Sub-System Number to bind to
* \param[in] pc Point Code to bind to, or OSMO_SS7_PC_INVALID if none.
* \returns Callee-allocated SCCP User on success; negative otherwise */
static struct osmo_sccp_user *
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 *scu;
scu = sccp_user_find(inst, ssn, pc);
if (scu) {
LOGP(DLSCCP, LOGL_ERROR,
"Cannot bind user '%s' to SSN=%u PC=%s, this SSN and PC"
" is already bound by '%s'\n",
name, ssn, osmo_ss7_pointcode_print(inst->ss7, pc), scu->name);
return NULL;
}
LOGP(DLSCCP, LOGL_INFO, "Binding user '%s' to SSN=%u PC=%s\n",
name, ssn, osmo_ss7_pointcode_print(inst->ss7, pc));
scu = talloc_zero(inst, struct osmo_sccp_user);
scu->name = talloc_strdup(scu, name);
scu->inst = inst;
scu->prim_cb = prim_cb;
scu->ssn = ssn;
scu->pc = pc;
llist_add_tail(&scu->list, &inst->users);
return scu;
}
/*! \brief Bind a given SCCP User to a given SSN+PC
* \param[in] inst SCCP Instance
* \param[in] name human-readable name
* \param[in] ssn Sub-System Number to bind to
* \param[in] pc Point Code to bind to
* \returns Callee-allocated SCCP User on success; negative otherwise */
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)
{
return sccp_user_bind_pc(inst, name, prim_cb, ssn, pc);
}
/*! \brief Bind a given SCCP User to a given SSN (at any PC)
* \param[in] inst SCCP Instance
* \param[in] name human-readable name
* \param[in] ssn Sub-System Number to bind to
* \returns Callee-allocated SCCP User on success; negative otherwise */
struct osmo_sccp_user *
osmo_sccp_user_bind(struct osmo_sccp_instance *inst, const char *name,
osmo_prim_cb prim_cb, uint16_t ssn)
{
return sccp_user_bind_pc(inst, name, prim_cb, ssn, OSMO_SS7_PC_INVALID);
}
/*! \brief Unbind a given SCCP user
* \param[in] scu SCCP User which is to be un-bound. Will be destroyed
* at the time this function returns. */
void osmo_sccp_user_unbind(struct osmo_sccp_user *scu)
{
LOGP(DLSCCP, LOGL_INFO, "Unbinding user '%s' from SSN=%u PC=%s\n",
scu->name, scu->ssn,
osmo_ss7_pointcode_print(scu->inst->ss7, scu->pc));
/* FIXME: free/release all connections held by this user? */
llist_del(&scu->list);
talloc_free(scu);
}
void osmo_sccp_user_set_priv(struct osmo_sccp_user *scu, void *priv)
{
scu->priv = priv;
}
void *osmo_sccp_user_get_priv(struct osmo_sccp_user *scu)
{
return scu->priv;
}
/*! \brief Send a SCCP User SAP Primitive up to the User
* \param[in] scu SCCP User to whom to send the primitive
* \param[in] prim Primitive to send to the user
* \returns return value of the SCCP User's prim_cb() function */
int sccp_user_prim_up(struct osmo_sccp_user *scu, struct osmo_scu_prim *prim)
{
LOGP(DLSCCP, LOGL_DEBUG, "Delivering %s to SCCP User '%s'\n",
osmo_scu_prim_name(&prim->oph), scu->name);
return scu->prim_cb(&prim->oph, scu);
}
/* prim_cb handed to MTP code for incoming MTP-TRANSFER.ind */
static int mtp_user_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
{
struct osmo_sccp_instance *inst = ctx;
struct osmo_mtp_prim *omp = (struct osmo_mtp_prim *)oph;
struct xua_msg *xua;
int rc;
OSMO_ASSERT(oph->sap == MTP_SAP_USER);
switch OSMO_PRIM(oph->primitive, oph->operation) {
case OSMO_PRIM(OSMO_MTP_PRIM_TRANSFER, PRIM_OP_INDICATION):
/* Convert from SCCP to SUA in xua_msg format */
xua = osmo_sccp_to_xua(oph->msg);
if (!xua) {
LOGP(DLSCCP, LOGL_ERROR, "Couldn't convert SCCP to SUA: %s\n",
msgb_hexdump(oph->msg));
rc = -1;
break;
}
xua->mtp = omp->u.transfer;
/* hand this primitive into SCCP via the SCRC code */
rc = scrc_rx_mtp_xfer_ind_xua(inst, xua);
xua_msg_free(xua);
break;
default:
LOGP(DLSCCP, LOGL_ERROR, "Unknown primitive %u:%u receivd\n",
oph->primitive, oph->operation);
rc = -1;
}
msgb_free(oph->msg);
return rc;
}
static LLIST_HEAD(sccp_instances);
/*! \brief create a SCCP Instance and register it as user with SS7 inst
* \param[in] ss7 SS7 instance to which this SCCP instance belongs
* \param[in] priv private data to be stored within SCCP instance
* \returns callee-allocated SCCP instance on success; NULL on error */
struct osmo_sccp_instance *
osmo_sccp_instance_create(struct osmo_ss7_instance *ss7, void *priv)
{
struct osmo_sccp_instance *inst;
int rc;
inst = talloc_zero(ss7, struct osmo_sccp_instance);
if (!inst)
return NULL;
inst->ss7 = ss7;
inst->priv = priv;
INIT_LLIST_HEAD(&inst->users);
inst->ss7_user.inst = ss7;
inst->ss7_user.name = "SCCP";
inst->ss7_user.prim_cb = mtp_user_prim_cb;
inst->ss7_user.priv = inst;
rc = sccp_scmg_init(inst);
if (rc < 0) {
talloc_free(inst);
return NULL;
}
osmo_ss7_user_register(ss7, MTP_SI_SCCP, &inst->ss7_user);
llist_add_tail(&inst->list, &sccp_instances);
return inst;
}
void osmo_sccp_instance_destroy(struct osmo_sccp_instance *inst)
{
struct osmo_sccp_user *scu, *scu2;
inst->ss7->sccp = NULL;
osmo_ss7_user_unregister(inst->ss7, MTP_SI_SCCP, &inst->ss7_user);
llist_for_each_entry_safe(scu, scu2, &inst->users, list) {
osmo_sccp_user_unbind(scu);
}
sccp_scoc_flush_connections(inst);
llist_del(&inst->list);
talloc_free(inst);
}
void osmo_sccp_set_priv(struct osmo_sccp_instance *sccp, void *priv)
{
sccp->priv = priv;
}
void *osmo_sccp_get_priv(struct osmo_sccp_instance *sccp)
{
return sccp->priv;
}
/*! \brief derive a basic local SCCP-Address from a given SCCP instance.
* \param[out] dest_addr pointer to output address memory
* \param[in] inst SCCP instance
* \param[in] ssn Subsystem Number */
void osmo_sccp_local_addr_by_instance(struct osmo_sccp_addr *dest_addr,
const struct osmo_sccp_instance *inst,
uint32_t ssn)
{
struct osmo_ss7_instance *ss7;
OSMO_ASSERT(dest_addr);
OSMO_ASSERT(inst);
ss7 = inst->ss7;
OSMO_ASSERT(ss7);
*dest_addr = (struct osmo_sccp_addr){};
osmo_sccp_make_addr_pc_ssn(dest_addr, ss7->cfg.primary_pc, ssn);
}
/*! \brief check whether a given SCCP-Address is consistent.
* \param[in] addr SCCP address to check
* \param[in] presence mask with minimum required address components
* \returns true when address data seems plausible */
bool osmo_sccp_check_addr(struct osmo_sccp_addr *addr, uint32_t presence)
{
/* Minimum requirements do not match */
if ((addr->presence & presence) != presence)
return false;
/* GT ranges */
if (addr->presence & OSMO_SCCP_ADDR_T_GT) {
if (addr->gt.gti > 15)
return false;
if (addr->gt.npi > 15)
return false;
if (addr->gt.nai > 127)
return false;
}
/* Routing by GT, but no GT present */
if (addr->ri == OSMO_SCCP_RI_GT
&& !(addr->presence & OSMO_SCCP_ADDR_T_GT))
return false;
/* Routing by PC/SSN, but no PC/SSN present */
if (addr->ri == OSMO_SCCP_RI_SSN_PC) {
if ((addr->presence & OSMO_SCCP_ADDR_T_PC) == 0)
return false;
if ((addr->presence & OSMO_SCCP_ADDR_T_SSN) == 0)
return false;
}
if (addr->ri == OSMO_SCCP_RI_SSN_IP) {
if ((addr->presence & OSMO_SCCP_ADDR_T_IPv4) == 0 &&
(addr->presence & OSMO_SCCP_ADDR_T_IPv6) == 0)
return false;
}
return true;
}
/*! Compare two SCCP Global Titles.
* \param[in] a left side.
* \param[in] b right side.
* \return -1 if a < b, 1 if a > b, and 0 if a == b.
*/
int osmo_sccp_gt_cmp(const struct osmo_sccp_gt *a, const struct osmo_sccp_gt *b)
{
if (a == b)
return 0;
if (!a)
return -1;
if (!b)
return 1;
return memcmp(a, b, sizeof(*a));
}
/*! Compare two SCCP addresses by given presence criteria.
* Any OSMO_SCCP_ADDR_T_* type not set in presence_criteria is ignored.
* In case all bits are set in presence_criteria, the comparison is in the order of:
* OSMO_SCCP_ADDR_T_GT, OSMO_SCCP_ADDR_T_PC, OSMO_SCCP_ADDR_T_IPv4, OSMO_SCCP_ADDR_T_IPv6, OSMO_SCCP_ADDR_T_SSN.
* The SCCP addresses' Routing Indicator is not compared, see osmo_sccp_addr_ri_cmp().
* \param[in] a left side.
* \param[in] b right side.
* \param[in] presence_criteria A bitmask of OSMO_SCCP_ADDR_T_* values, or OSMO_SCCP_ADDR_T_MASK to compare all parts,
* except the routing indicator.
* \return -1 if a < b, 1 if a > b, and 0 if all checked values match.
*/
int osmo_sccp_addr_cmp(const struct osmo_sccp_addr *a, const struct osmo_sccp_addr *b, uint32_t presence_criteria)
{
int rc;
if (a == b)
return 0;
if (!a)
return -1;
if (!b)
return 1;
if (presence_criteria & OSMO_SCCP_ADDR_T_GT) {
if ((a->presence & OSMO_SCCP_ADDR_T_GT) != (b->presence & OSMO_SCCP_ADDR_T_GT))
return (b->presence & OSMO_SCCP_ADDR_T_GT) ? -1 : 1;
rc = osmo_sccp_gt_cmp(&a->gt, &b->gt);
if (rc)
return rc;
}
if (presence_criteria & OSMO_SCCP_ADDR_T_PC) {
if ((a->presence & OSMO_SCCP_ADDR_T_PC) != (b->presence & OSMO_SCCP_ADDR_T_PC))
return (b->presence & OSMO_SCCP_ADDR_T_PC) ? -1 : 1;
if ((a->presence & OSMO_SCCP_ADDR_T_PC)
&& a->pc != b->pc)
return (a->pc < b->pc)? -1 : 1;
}
if (presence_criteria & OSMO_SCCP_ADDR_T_IPv4) {
if ((a->presence & OSMO_SCCP_ADDR_T_IPv4) != (b->presence & OSMO_SCCP_ADDR_T_IPv4))
return (b->presence & OSMO_SCCP_ADDR_T_IPv4) ? -1 : 1;
rc = memcmp(&a->ip.v4, &b->ip.v4, sizeof(a->ip.v4));
if (rc)
return rc;
}
if (presence_criteria & OSMO_SCCP_ADDR_T_IPv6) {
if ((a->presence & OSMO_SCCP_ADDR_T_IPv6) != (b->presence & OSMO_SCCP_ADDR_T_IPv6))
return (b->presence & OSMO_SCCP_ADDR_T_IPv6) ? -1 : 1;
rc = memcmp(&a->ip.v6, &b->ip.v6, sizeof(a->ip.v6));
if (rc)
return rc;
}
if (presence_criteria & OSMO_SCCP_ADDR_T_SSN) {
if ((a->presence & OSMO_SCCP_ADDR_T_SSN) != (b->presence & OSMO_SCCP_ADDR_T_SSN))
return (b->presence & OSMO_SCCP_ADDR_T_SSN) ? -1 : 1;
if (a->ssn != b->ssn)
return (a->ssn < b->ssn) ? -1 : 1;
}
return 0;
}
/*! Compare the routing information of two SCCP addresses.
* Compare the ri of a and b, and, if equal, return osmo_sccp_addr_cmp() with presence criteria selected according to
* ri.
* \param[in] a left side.
* \param[in] b right side.
* \return -1 if a < b, 1 if a > b, and 0 if a == b.
*/
int osmo_sccp_addr_ri_cmp(const struct osmo_sccp_addr *a, const struct osmo_sccp_addr *b)
{
uint32_t presence_criteria;
if (a == b)
return 0;
if (!a)
return -1;
if (!b)
return 1;
if (a->ri != b->ri)
return (a->ri < b->ri) ? -1 : 1;
switch (a->ri) {
case OSMO_SCCP_RI_NONE:
return 0;
case OSMO_SCCP_RI_GT:
presence_criteria = OSMO_SCCP_ADDR_T_GT;
break;
case OSMO_SCCP_RI_SSN_PC:
presence_criteria = OSMO_SCCP_ADDR_T_SSN | OSMO_SCCP_ADDR_T_PC;
break;
case OSMO_SCCP_RI_SSN_IP:
/* Pick IPv4 or v6 depending on what a->presence indicates. */
presence_criteria = OSMO_SCCP_ADDR_T_SSN | (a->presence & (OSMO_SCCP_ADDR_T_IPv4 | OSMO_SCCP_ADDR_T_IPv6));
break;
default:
return 0;
}
return osmo_sccp_addr_cmp(a, b, presence_criteria);
}
/*! Compose a human readable string to describe the SCCP user's connection.
* The output follows ['<scu.name>':]<local-sccp-addr>, e.g. "'OsmoHNBW':RI=SSN_PC,PC=0.23.5,SSN=RANAP",
* or just "RI=SSN_PC,PC=0.23.5,SSN=RANAP" if no scu->name is set.
* This calls osmo_sccp_addr_name(), which returns a static buffer; hence calling this function and
* osmo_sccp_addr_name() in the same printf statement is likely to conflict. */
const char *osmo_sccp_user_name(struct osmo_sccp_user *scu)
{
static char buf[128];
struct osmo_sccp_addr sca;
/* Interestingly enough, the osmo_sccp_user stores an SSN and PC, but not in an osmo_sccp_addr
* struct. To be able to use osmo_sccp_addr_name(), we need to first create an osmo_sccp_addr. */
osmo_sccp_make_addr_pc_ssn(&sca, scu->pc, scu->ssn);
snprintf(buf, sizeof(buf),
"%s%s%s",
scu->name && *scu->name ? scu->name : "",
scu->name && *scu->name ? ":" : "",
osmo_sccp_addr_name(scu->inst->ss7, &sca));
buf[sizeof(buf)-1] = '\0';
return buf;
}
/***********************************************************************
* Convenience function for CLIENT
***********************************************************************/
/*! \brief request an sccp client instance
* \param[in] ctx talloc context
* \param[in] ss7_id of the SS7/CS7 instance
* \param[in] name human readable name
* \param[in] default_pc pointcode to be used on missing VTY setting
* \param[in] prot protocol to be used (e.g OSMO_SS7_ASP_PROT_M3UA)
* \param[in] default_local_port local port to be used on missing VTY setting
* \param[in] default_local_ip local IP-address to be used on missing VTY setting (NULL: use library own defaults)
* \param[in] default_remote_port remote port to be used on missing VTY setting
* \param[in] default_remote_ip remote IP-address to be used on missing VTY setting (NULL: use library own defaults)
* \returns callee-allocated SCCP instance on success; NULL on error */
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_ss7_instance *ss7;
bool ss7_created = false;
struct osmo_ss7_as *as;
bool as_created = false;
struct osmo_ss7_route *rt;
bool rt_created = false;
struct osmo_ss7_asp *asp;
bool asp_created = false;
char *as_name, *asp_name = NULL;
/*! The function will examine the given CS7 instance and its sub
* components (as, asp, etc.). If necessary it will allocate
* the missing components. If no CS7 instance can be detected
* under the caller supplied ID, a new instance will be created
* beforehand. */
/* Choose default ports when the caller does not supply valid port
* numbers. */
if (!default_remote_port || default_remote_port < 0)
default_remote_port = osmo_ss7_asp_protocol_port(prot);
if (default_local_port < 0)
default_local_port = osmo_ss7_asp_protocol_port(prot);
/* Check if there is already an ss7 instance present under
* the given id. If not, we will create a new one. */
ss7 = osmo_ss7_instance_find(ss7_id);
if (!ss7) {
LOGP(DLSCCP, LOGL_NOTICE, "%s: Creating SS7 instance\n",
name);
/* Create a new ss7 instance */
ss7 = osmo_ss7_instance_find_or_create(ctx, ss7_id);
if (!ss7) {
LOGP(DLSCCP, LOGL_ERROR,
"Failed to find or create SS7 instance\n");
return NULL;
}
/* Setup primary pointcode
* NOTE: This means that the user must set the pointcode to a
* proper value when a cs7 instance is defined via the VTY. */
ss7->cfg.primary_pc = default_pc;
ss7_created = true;
}
/* In case no valid point-code has been configured via the VTY, we
* will fall back to the default pointcode. */
if (!osmo_ss7_pc_is_valid(ss7->cfg.primary_pc)) {
LOGP(DLSCCP, LOGL_ERROR,
"SS7 instance %u: no primary point-code set, using default point-code\n",
ss7->cfg.id);
ss7->cfg.primary_pc = default_pc;
}
LOGP(DLSCCP, LOGL_NOTICE, "%s: Using SS7 instance %u, pc:%s\n", name,
ss7->cfg.id, osmo_ss7_pointcode_print(ss7, ss7->cfg.primary_pc));
/* Check if there is already an application server that matches
* the protocol we intend to use. If not, we will create one. */
as = osmo_ss7_as_find_by_proto(ss7, prot);
if (!as) {
LOGP(DLSCCP, LOGL_NOTICE, "%s: Creating AS instance\n",
name);
as_name = talloc_asprintf(ctx, "as-clnt-%s", name);
as = osmo_ss7_as_find_or_create(ss7, as_name, prot);
talloc_free(as_name);
if (!as)
goto out_ss7;
as_created = true;
as->cfg.routing_key.pc = ss7->cfg.primary_pc;
as->simple_client_allocated = true;
}
LOGP(DLSCCP, LOGL_NOTICE, "%s: Using AS instance %s\n", name,
as->cfg.name);
/* Create a default route if necessary */
rt = osmo_ss7_route_find_dpc_mask(ss7->rtable_system, 0, 0);
if (!rt) {
LOGP(DLSCCP, LOGL_NOTICE, "%s: Creating default route\n", name);
rt = osmo_ss7_route_create(ss7->rtable_system, 0, 0,
as->cfg.name);
if (!rt)
goto out_as;
rt_created = true;
}
/* Check if we do already have an application server process
* that is associated with the application server we have choosen
* the application server process must also match the protocol
* we intend to use. */
asp = osmo_ss7_asp_find_by_proto(as, prot);
if (!asp) {
/* Check if the user has created an ASP for this proto that is not added on any AS yet. */
struct osmo_ss7_asp *asp_i;
llist_for_each_entry(asp_i, &ss7->asp_list, list) {
struct osmo_ss7_as *as_i;
bool is_on_as = false;
if (asp_i->cfg.proto != prot)
continue;
llist_for_each_entry(as_i, &ss7->as_list, list) {
if (!osmo_ss7_as_has_asp(as_i, asp_i))
continue;
is_on_as = true;
break;
}
if (is_on_as) {
/* This ASP is already on another AS. If it was on this AS, we'd have found it above. */
continue;
}
/* This ASP matches the protocol and is not yet associated to any AS. Use it. */
asp = asp_i;
LOGP(DLSCCP, LOGL_NOTICE, "%s: ASP %s for %s is not associated with any AS, using it\n",
name, asp->cfg.name, osmo_ss7_asp_protocol_name(prot));
break;
}
if (!asp) {
asp_name = talloc_asprintf(ctx, "asp-clnt-%s", name);
LOGP(DLSCCP, LOGL_NOTICE, "%s: No unassociated ASP for %s, creating new ASP %s\n",
name, osmo_ss7_asp_protocol_name(prot), asp_name);
asp =
osmo_ss7_asp_find_or_create(ss7, asp_name,
default_remote_port,
default_local_port,
prot);
talloc_free(asp_name);
if (!asp)
goto out_rt;
asp_created = true;
if (default_local_ip)
osmo_ss7_asp_peer_set_hosts(&asp->cfg.local, asp, &default_local_ip, 1);
if (default_remote_ip)
osmo_ss7_asp_peer_set_hosts(&asp->cfg.remote, asp, &default_remote_ip, 1);
/* Make sure proper defaults are applied if app didn't provide specific default values */
osmo_ss7_asp_set_default_peer_hosts(asp);
asp->simple_client_allocated = true;
}
osmo_ss7_as_add_asp(as, asp->cfg.name);
}
/* Ensure that the ASP we use is set to client mode. */
asp->cfg.is_server = false;
/* Make sure that the role of this ASP is set to ASP unless the user
* made a concious decision about the role via the VTY */
if (!asp->cfg.role_set_by_vty)
asp->cfg.role = OSMO_SS7_ASP_ROLE_ASP;
/* Restart ASP */
if (prot != OSMO_SS7_ASP_PROT_IPA)
osmo_ss7_asp_use_default_lm(asp, LOGL_DEBUG);
osmo_ss7_asp_restart(asp);
LOGP(DLSCCP, LOGL_NOTICE, "%s: Using ASP instance %s\n", name,
asp->cfg.name);
osmo_ss7_ensure_sccp(ss7);
if (!ss7->sccp)
goto out_asp;
return ss7->sccp;
out_asp:
if (asp_created)
osmo_ss7_asp_destroy(asp);
out_rt:
if (rt_created)
osmo_ss7_route_destroy(rt);
out_as:
if (as_created)
osmo_ss7_as_destroy(as);
out_ss7:
if (ss7_created)
osmo_ss7_instance_destroy(ss7);
return NULL;
}
/*! \brief request an sccp client instance
* \param[in] ctx talloc context
* \param[in] name human readable name
* \param[in] default_pc pointcode to be used on missing VTY setting
* \param[in] prot protocol to be used (e.g OSMO_SS7_ASP_PROT_M3UA)
* \param[in] default_local_port local port to be used on missing VTY setting
* \param[in] default_local_ip local IP-address to be used on missing VTY setting
* \param[in] default_remote_port remote port to be used on missing VTY setting
* \param[in] default_remote_ip remote IP-address to be used on missing VTY setting
* \returns callee-allocated SCCP instance on success; NULL on error */
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)
{
/*! This is simplified version of osmo_sccp_simple_client_on_ss7_id().
* the only difference is that the ID of the CS7 instance will be
* set to 0 statically */
return osmo_sccp_simple_client_on_ss7_id(ctx, 0, name, default_pc, prot,
default_local_port,
default_local_ip,
default_remote_port,
default_remote_ip);
}
/***********************************************************************
* Convenience function for SERVER
***********************************************************************/
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_ss7_instance *ss7;
struct osmo_xua_server *xs;
int rc;
if (local_port < 0)
local_port = osmo_ss7_asp_protocol_port(prot);
/* allocate + initialize SS7 instance */
ss7 = osmo_ss7_instance_find_or_create(ctx, ss7_id);
if (!ss7)
return NULL;
ss7->cfg.primary_pc = pc;
xs = osmo_ss7_xua_server_create(ss7, prot, local_port, local_ip);
if (!xs)
goto out_ss7;
rc = osmo_ss7_xua_server_bind(xs);
if (rc < 0)
goto out_xs;
/* Allocate SCCP stack */
osmo_ss7_ensure_sccp(ss7);
if (!ss7->sccp)
goto out_xs;
return ss7->sccp;
out_xs:
osmo_ss7_xua_server_destroy(xs);
out_ss7:
osmo_ss7_instance_destroy(ss7);
return NULL;
}
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)
{
return osmo_sccp_simple_server_on_ss7_id(ctx, 0, pc, prot,
local_port, 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)
{
struct osmo_ss7_instance *ss7 = inst->ss7;
struct osmo_ss7_as *as;
struct osmo_ss7_route *rt;
struct osmo_ss7_asp *asp;
struct osmo_xua_server *oxs;
char *as_name, *asp_name;
if (local_port < 0)
local_port = osmo_ss7_asp_protocol_port(prot);
if (remote_port < 0)
remote_port = osmo_ss7_asp_protocol_port(prot);
as_name = talloc_asprintf(ss7, "as-srv-%s", name);
asp_name = talloc_asprintf(ss7, "asp-srv-%s", name);
/* application server */
as = osmo_ss7_as_find_or_create(ss7, as_name, prot);
if (!as)
goto out_strings;
/* route only selected PC to the client */
rt = osmo_ss7_route_create(ss7->rtable_system, pc, 0xffff, as_name);
if (!rt)
goto out_as;
asp = osmo_ss7_asp_find_or_create(ss7, asp_name, remote_port, local_port, prot);
if (!asp)
goto out_rt;
oxs = osmo_ss7_xua_server_find(ss7, prot, local_port);
if (!oxs)
goto out_asp;
if (osmo_ss7_asp_peer_set_hosts(&asp->cfg.local, asp,
(const char* const*)oxs->cfg.local.host,
oxs->cfg.local.host_cnt) < 0)
goto out_asp;
if (osmo_ss7_asp_peer_add_host(&asp->cfg.remote, asp, remote_ip) < 0)
goto out_asp;
asp->cfg.is_server = true;
asp->cfg.role = OSMO_SS7_ASP_ROLE_SG;
osmo_ss7_as_add_asp(as, asp_name);
talloc_free(asp_name);
talloc_free(as_name);
osmo_ss7_asp_restart(asp);
return ss7->sccp;
out_asp:
osmo_ss7_asp_destroy(asp);
out_rt:
osmo_ss7_route_destroy(rt);
out_as:
osmo_ss7_as_destroy(as);
out_strings:
talloc_free(as_name);
talloc_free(asp_name);
return NULL;
}
/*! \brief get the SS7 instance that is related to the given SCCP instance
* \param[in] sccp SCCP instance
* \returns SS7 instance; NULL if sccp was NULL */
struct osmo_ss7_instance *osmo_sccp_get_ss7(const struct osmo_sccp_instance *sccp)
{
if (!sccp)
return NULL;
return sccp->ss7;
}
/*! \brief get the SCCP instance that is related to the given sccp user
* \param[in] scu SCCP user
* \returns SCCP instance; NULL if scu was NULL */
struct osmo_sccp_instance *osmo_sccp_get_sccp(const struct osmo_sccp_user *scu)
{
if (!scu)
return NULL;
return scu->inst;
}
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