Osmocom Remote SIM Software Suite https://osmocom.org/projects/osmo-remsim
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osmo-remsim/src/server/rspro_server.c

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25 KiB

#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/select.h>
#include <osmocom/core/fsm.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/socket.h>
#include <osmocom/gsm/protocol/ipaccess.h>
#include <osmocom/abis/ipa.h>
#include <osmocom/rspro/RsproPDU.h>
#include "debug.h"
#include "rspro_util.h"
#include "rspro_server.h"
#define S(x) (1 << (x))
static RsproPDU_t *slotmap2CreateMappingReq(const struct slot_mapping *slotmap)
{
ClientSlot_t clslot;
BankSlot_t bslot;
client_slot2rspro(&clslot, &slotmap->client);
bank_slot2rspro(&bslot, &slotmap->bank);
return rspro_gen_CreateMappingReq(&clslot, &bslot);
}
static RsproPDU_t *slotmap2RemoveMappingReq(const struct slot_mapping *slotmap)
{
ClientSlot_t clslot;
BankSlot_t bslot;
client_slot2rspro(&clslot, &slotmap->client);
bank_slot2rspro(&bslot, &slotmap->bank);
return rspro_gen_RemoveMappingReq(&clslot, &bslot);
}
static void client_conn_send(struct rspro_client_conn *conn, RsproPDU_t *pdu)
{
if (!pdu) {
LOGPFSML(conn->fi, LOGL_ERROR, "Attempt to transmit NULL\n");
osmo_log_backtrace(DMAIN, LOGL_ERROR);
return;
}
LOGPFSM(conn->fi, "Tx RSPRO %s\n", rspro_msgt_name(pdu));
struct msgb *msg_tx = rspro_enc_msg(pdu);
if (!msg_tx) {
LOGPFSML(conn->fi, LOGL_ERROR, "Error encdoing RSPRO %s\n", rspro_msgt_name(pdu));
osmo_log_backtrace(DMAIN, LOGL_ERROR);
ASN_STRUCT_FREE(asn_DEF_RsproPDU, pdu);
return;
}
ipa_prepend_header_ext(msg_tx, IPAC_PROTO_EXT_RSPRO);
ipa_msg_push_header(msg_tx, IPAC_PROTO_OSMO);
ipa_server_conn_send(conn->peer, msg_tx);
}
/***********************************************************************
* per-client connection FSM
***********************************************************************/
static void rspro_client_conn_destroy(struct rspro_client_conn *conn);
enum remsim_server_client_fsm_state {
CLNTC_ST_INIT,
CLNTC_ST_ESTABLISHED,
CLNTC_ST_WAIT_CONF_RES, /* waiting for ConfigClientRes */
CLNTC_ST_CONNECTED_BANKD,
CLNTC_ST_CONNECTED_CLIENT,
};
enum remsim_server_client_event {
CLNTC_E_TCP_UP,
CLNTC_E_CLIENT_CONN, /* Connect{Client,Bank}Req received */
CLNTC_E_BANK_CONN,
CLNTC_E_TCP_DOWN,
CLNTC_E_KA_TIMEOUT,
CLNTC_E_CREATE_MAP_RES, /* CreateMappingRes received */
CLNTC_E_REMOVE_MAP_RES, /* RemoveMappingRes received */
CLNTC_E_CONFIG_CL_RES, /* ConfigClientRes received */
CLNTC_E_PUSH, /* drain maps_new or maps_delreq */
CLNTC_E_CL_CFG_BANKD, /* send [new] ConfigConfigBankReq */
};
static const struct value_string server_client_event_names[] = {
OSMO_VALUE_STRING(CLNTC_E_TCP_UP),
OSMO_VALUE_STRING(CLNTC_E_CLIENT_CONN),
OSMO_VALUE_STRING(CLNTC_E_BANK_CONN),
OSMO_VALUE_STRING(CLNTC_E_TCP_DOWN),
OSMO_VALUE_STRING(CLNTC_E_KA_TIMEOUT),
OSMO_VALUE_STRING(CLNTC_E_CREATE_MAP_RES),
OSMO_VALUE_STRING(CLNTC_E_REMOVE_MAP_RES),
OSMO_VALUE_STRING(CLNTC_E_CONFIG_CL_RES),
OSMO_VALUE_STRING(CLNTC_E_PUSH),
OSMO_VALUE_STRING(CLNTC_E_CL_CFG_BANKD),
{ 0, NULL }
};
static void clnt_st_init(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch (event) {
case CLNTC_E_TCP_UP:
osmo_fsm_inst_state_chg(fi, CLNTC_ST_ESTABLISHED, 10, 1);
break;
default:
OSMO_ASSERT(0);
}
}
static void clnt_st_established(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct rspro_client_conn *conn = fi->priv;
const RsproPDU_t *pdu = data;
const ConnectClientReq_t *cclreq = NULL;
const ConnectBankReq_t *cbreq = NULL;
RsproPDU_t *resp = NULL;
char ip_str[INET6_ADDRSTRLEN];
char port_str[6];
/* remote IP and port */
osmo_sock_get_ip_and_port(conn->peer->ofd.fd, ip_str, sizeof(ip_str),
port_str, sizeof(port_str), false);
switch (event) {
case CLNTC_E_CLIENT_CONN:
cclreq = &pdu->msg.choice.connectClientReq;
/* save the [remote] component identity in 'conn' */
rspro_comp_id_retrieve(&conn->comp_id, &cclreq->identity);
if (conn->comp_id.type != ComponentType_remsimClient) {
LOGPFSM(fi, "ConnectClientReq from identity != Client ?!?\n");
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL);
}
/* reparent us from srv->connections to srv->clients */
pthread_rwlock_wrlock(&conn->srv->rwlock);
llist_del(&conn->list);
llist_add_tail(&conn->list, &conn->srv->clients);
pthread_rwlock_unlock(&conn->srv->rwlock);
if (!cclreq->clientSlot) {
#if 0
/* FIXME: determine ClientID */
resp = rspro_gen_ConnectClientRes(&conn->srv->comp_id, ResultCode_ok);
client_conn_send(conn, resp);
osmo_fsm_inst_state_chg(fi, CLNTC_ST_WAIT_CL_CONF_RES, 3, 30);
#else
/* FIXME: the original plan was to dynamically assign a ClientID
* from server to client here. Send ConfigReq and transition to
* CLNTC_ST_WAIT_CONF_RES */
LOGPFSM(fi, "ConnectClientReq without ClientId not supported yet!\n");
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL);
#endif
} else {
/* FIXME: check for unique-ness */
rspro2client_slot(&conn->client.slot, cclreq->clientSlot);
osmo_fsm_inst_update_id_f(fi, "C%u:%u", conn->client.slot.client_id,
conn->client.slot.slot_nr);
osmo_fsm_inst_update_id_f(conn->keepalive_fi, "C%u:%u",
conn->client.slot.client_id,
conn->client.slot.slot_nr);
LOGPFSML(fi, LOGL_INFO, "Client connected from %s:%s\n", ip_str, port_str);
resp = rspro_gen_ConnectClientRes(&conn->srv->comp_id, ResultCode_ok);
client_conn_send(conn, resp);
osmo_fsm_inst_state_chg(fi, CLNTC_ST_CONNECTED_CLIENT, 0, 0);
}
break;
case CLNTC_E_BANK_CONN:
cbreq = &pdu->msg.choice.connectBankReq;
/* save the [remote] component identity in 'conn' */
rspro_comp_id_retrieve(&conn->comp_id, &cbreq->identity);
if (conn->comp_id.type != ComponentType_remsimBankd) {
LOGPFSM(fi, "ConnectBankReq from identity != Bank ?!?\n");
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL);
}
/* FIXME: check for unique-ness */
conn->bank.bank_id = cbreq->bankId;
conn->bank.num_slots = cbreq->numberOfSlots;
osmo_fsm_inst_update_id_f(fi, "B%u", conn->bank.bank_id);
osmo_fsm_inst_update_id_f(conn->keepalive_fi, "B%u", conn->bank.bank_id);
LOGPFSML(fi, LOGL_INFO, "Bankd connected from %s:%s\n", ip_str, port_str);
if (!strncmp(ip_str, "127.", 4)) {
LOGPFSML(fi, LOGL_NOTICE, "Bankd connected from %s (localhost). "
"This only works if your clients also all are on localhost, "
"as they must be able to reach the bankd!\n", ip_str);
}
/* reparent us from srv->connections to srv->banks */
pthread_rwlock_wrlock(&conn->srv->rwlock);
llist_del(&conn->list);
llist_add_tail(&conn->list, &conn->srv->banks);
pthread_rwlock_unlock(&conn->srv->rwlock);
/* send response to bank first */
resp = rspro_gen_ConnectBankRes(&conn->srv->comp_id, ResultCode_ok);
client_conn_send(conn, resp);
/* the state change will associate any pre-existing slotmaps */
osmo_fsm_inst_state_chg(fi, CLNTC_ST_CONNECTED_BANKD, 0, 0);
osmo_fsm_inst_dispatch(fi, CLNTC_E_PUSH, NULL);
break;
default:
OSMO_ASSERT(0);
}
}
static void clnt_st_wait_cl_conf_res(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch (event) {
case CLNTC_E_CONFIG_CL_RES:
osmo_fsm_inst_state_chg(fi, CLNTC_ST_CONNECTED_CLIENT, 0, 0);
break;
default:
OSMO_ASSERT(0);
}
}
/*! find a connected client (if any) for given slotmap and update its Bankd configuration.
* \param[in] map slotmap whose client connection shall be updated
* \param[in] srv rspro_server on which we operate
* \param[in] bankd_conn bankd connection serving the map (may be NULL if not known)
*/
static void _update_client_for_slotmap(struct slot_mapping *map, struct rspro_server *srv,
struct rspro_client_conn *bankd_conn)
{
struct rspro_client_conn *conn;
char ip_str[INET6_ADDRSTRLEN];
char port_str[6];
uint32_t bankd_ip;
int bankd_port;
bool changed = false;
int rc;
OSMO_ASSERT(map);
OSMO_ASSERT(srv);
conn = client_conn_by_slot(srv, &map->client);
if (!conn)
LOGP(DMAIN, LOGL_DEBUG, "%s\n", __func__);
else
LOGPFSM(conn->fi, "%s\n", __func__);
if (!conn)
return;
if (!bank_slot_equals(&conn->client.bankd.slot, &map->bank)) {
LOGPFSM(conn->fi, "BankSlot has changed B%u:%u -> B%u:%u\n",
conn->client.bankd.slot.bank_id, conn->client.bankd.slot.slot_nr,
map->bank.bank_id, map->bank.slot_nr);
conn->client.bankd.slot = map->bank;
changed = true;
}
/* if caller didn't provide bankd_conn, resolve it from map */
if (!bankd_conn)
bankd_conn = bankd_conn_by_id(srv, map->bank.bank_id);
if (map->state == SLMAP_S_DELETING || !bankd_conn) {
bankd_ip = 0;
bankd_port = 0;
} else {
/* obtain IP and port of bankd */
rc = osmo_sock_get_ip_and_port(bankd_conn->peer->ofd.fd, ip_str, sizeof(ip_str),
port_str, sizeof(port_str), false);
if (rc < 0) {
LOGPFSM(bankd_conn->fi, "Error during getpeername\n");
return;
}
bankd_ip = ntohl(inet_addr(ip_str));
bankd_port = 9999; /* TODO: configurable */
}
/* determine if IP/port of bankd have changed */
if (conn->client.bankd.port != bankd_port || conn->client.bankd.ip != bankd_ip) {
struct in_addr ia = { .s_addr = bankd_ip };
LOGPFSM(conn->fi, "Bankd IP/Port changed to %s:%u\n", inet_ntoa(ia), bankd_port);
conn->client.bankd.ip = bankd_ip;
conn->client.bankd.port = bankd_port;
changed = true;
}
/* update the client with new bankd information, if any changes were made */
if (changed)
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_CL_CFG_BANKD, NULL);
}
static void clnt_st_connected_client_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct rspro_client_conn *conn = fi->priv;
struct slotmaps *slotmaps = conn->srv->slotmaps;
struct slot_mapping *map;
LOGPFSM(fi, "%s\n", __func__);
/* check for an existing slotmap for this client/slot */
slotmaps_rdlock(slotmaps);
llist_for_each_entry(map, &slotmaps->mappings, list) {
if (client_slot_equals(&map->client, &conn->client.slot)) {
_update_client_for_slotmap(map, conn->srv, NULL);
break;
}
}
slotmaps_unlock(slotmaps);
#if 0
ClientSlot_t clslot;
RsproPDU_t *pdu;
/* send configuration to this new client */
client_slot2rspro(&clslot, FIXME);
pdu = rspro_gen_ConfigClientReq(&clslot, bankd_ip, bankd_port);
client_conn_send(conn, pdu);
#endif
}
static void clnt_st_connected_bankd_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct rspro_client_conn *conn = fi->priv;
struct slotmaps *slotmaps = conn->srv->slotmaps;
struct slot_mapping *map;
LOGPFSM(fi, "Associating pre-existing slotmaps (if any)\n");
/* Link all known mappings to this new bank */
slotmaps_wrlock(slotmaps);
llist_for_each_entry(map, &slotmaps->mappings, list) {
if (map->bank.bank_id == conn->bank.bank_id)
_slotmap_state_change(map, SLMAP_S_NEW, &conn->bank.maps_new);
}
slotmaps_unlock(slotmaps);
}
static void clnt_st_connected_client(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct rspro_client_conn *conn = fi->priv;
BankSlot_t bslot;
RsproPDU_t *tx;
switch (event) {
case CLNTC_E_CL_CFG_BANKD: /* Send [new] Bankd information to client */
bank_slot2rspro(&bslot, &conn->client.bankd.slot);
tx = rspro_gen_ConfigClientBankReq(&bslot, conn->client.bankd.ip,
conn->client.bankd.port);
client_conn_send(conn, tx);
break;
default:
OSMO_ASSERT(0);
}
}
static void clnt_st_connected_bankd(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct rspro_client_conn *conn = fi->priv;
struct slotmaps *slotmaps = conn->srv->slotmaps;
const __attribute__((unused)) RsproPDU_t *rx = NULL;
struct slot_mapping *map, *map2;
switch (event) {
case CLNTC_E_CREATE_MAP_RES: /* Bankd acknowledges mapping was created */
rx = data;
slotmaps_wrlock(slotmaps);
/* FIXME: resolve map by pdu->tag */
/* as hack use first element of conn->maps_unack */
map = llist_first_entry(&conn->bank.maps_unack, struct slot_mapping, bank_list);
if (!map) {
slotmaps_unlock(slotmaps);
LOGPFSM(fi, "CreateMapRes but no unacknowledged map");
break;
}
_slotmap_state_change(map, SLMAP_S_ACTIVE, &conn->bank.maps_active);
slotmaps_unlock(slotmaps);
_update_client_for_slotmap(map, conn->srv, conn);
break;
case CLNTC_E_REMOVE_MAP_RES: /* Bankd acknowledges mapping was removed */
rx = data;
slotmaps_wrlock(slotmaps);
/* FIXME: resolve map by pdu->tag */
/* as hack use first element of conn->maps_deleting */
map = llist_first_entry(&conn->bank.maps_deleting, struct slot_mapping, bank_list);
if (!map) {
slotmaps_unlock(slotmaps);
LOGPFSM(fi, "RemoveMapRes but no unacknowledged map");
break;
}
slotmaps_unlock(slotmaps);
/* update client! */
OSMO_ASSERT(map->state == SLMAP_S_DELETING);
_update_client_for_slotmap(map, conn->srv, conn);
/* slotmap_del() will remove it from both global and bank list */
slotmap_del(map->maps, map);
break;
case CLNTC_E_PUSH: /* check if any create or delete requests are pending */
slotmaps_wrlock(slotmaps);
/* send any pending create requests */
llist_for_each_entry_safe(map, map2, &conn->bank.maps_new, bank_list) {
RsproPDU_t *pdu = slotmap2CreateMappingReq(map);
client_conn_send(conn, pdu);
_slotmap_state_change(map, SLMAP_S_UNACKNOWLEDGED, &conn->bank.maps_unack);
}
/* send any pending delete requests */
llist_for_each_entry_safe(map, map2, &conn->bank.maps_delreq, bank_list) {
RsproPDU_t *pdu = slotmap2RemoveMappingReq(map);
client_conn_send(conn, pdu);
_slotmap_state_change(map, SLMAP_S_DELETING, &conn->bank.maps_deleting);
}
slotmaps_unlock(slotmaps);
break;
default:
OSMO_ASSERT(0);
}
}
static void clnt_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
//struct rspro_client_conn *conn = fi->priv;
switch (event) {
case CLNTC_E_TCP_DOWN:
LOGPFSML(fi, LOGL_NOTICE, "Connection lost; terminating FSM\n");
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, NULL);
break;
case CLNTC_E_KA_TIMEOUT:
LOGPFSML(fi, LOGL_NOTICE, "IPA keep-alive timeout; terminating FSM\n");
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, NULL);
break;
default:
OSMO_ASSERT(0);
}
}
static int server_client_fsm_timer_cb(struct osmo_fsm_inst *fi)
{
//struct rspro_client_conn *conn = fi->priv;
switch (fi->T) {
case 1:
/* No ClientConnectReq received:disconnect */
return 1; /* ask core to terminate FSM */
default:
OSMO_ASSERT(0);
}
return 0;
}
static void server_client_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause)
{
struct rspro_client_conn *conn = fi->priv;
/* this call will destroy the IPA connection, which will in turn call closed_cb()
* which will try to deliver a E_TCP_DOWN event. Clear conn->fi to avoid that loop */
conn->fi = NULL;
rspro_client_conn_destroy(conn);
}
static const struct osmo_fsm_state server_client_fsm_states[] = {
[CLNTC_ST_INIT] = {
.name = "INIT",
.in_event_mask = S(CLNTC_E_TCP_UP),
.out_state_mask = S(CLNTC_ST_ESTABLISHED),
.action = clnt_st_init,
},
[CLNTC_ST_ESTABLISHED] = {
.name = "ESTABLISHED",
.in_event_mask = S(CLNTC_E_CLIENT_CONN) | S(CLNTC_E_BANK_CONN),
.out_state_mask = S(CLNTC_ST_CONNECTED_CLIENT) | S(CLNTC_ST_WAIT_CONF_RES) |
S(CLNTC_ST_CONNECTED_BANKD),
.action = clnt_st_established,
},
[CLNTC_ST_WAIT_CONF_RES] = {
.name = "WAIT_CONFIG_RES",
.in_event_mask = S(CLNTC_E_CONFIG_CL_RES),
.out_state_mask = S(CLNTC_ST_CONNECTED_CLIENT),
.action = clnt_st_wait_cl_conf_res,
},
[CLNTC_ST_CONNECTED_CLIENT] = {
.name = "CONNECTED_CLIENT",
.in_event_mask = S(CLNTC_E_CL_CFG_BANKD),
.action = clnt_st_connected_client,
.onenter = clnt_st_connected_client_onenter,
},
[CLNTC_ST_CONNECTED_BANKD] = {
.name = "CONNECTED_BANKD",
.in_event_mask = S(CLNTC_E_CREATE_MAP_RES) | S(CLNTC_E_REMOVE_MAP_RES) |
S(CLNTC_E_PUSH),
.action = clnt_st_connected_bankd,
.onenter = clnt_st_connected_bankd_onenter,
},
};
static struct osmo_fsm remsim_server_client_fsm = {
.name = "SERVER_CONN",
.states = server_client_fsm_states,
.num_states = ARRAY_SIZE(server_client_fsm_states),
.allstate_event_mask = S(CLNTC_E_TCP_DOWN) | S(CLNTC_E_KA_TIMEOUT),
.allstate_action = clnt_allstate_action,
.cleanup = server_client_cleanup,
.timer_cb = server_client_fsm_timer_cb,
.log_subsys = DMAIN,
.event_names = server_client_event_names,
};
struct osmo_fsm_inst *server_client_fsm_alloc(void *ctx, struct rspro_client_conn *conn)
{
//const char *id = osmo_sock_get_name2(conn->peer->ofd.fd);
return osmo_fsm_inst_alloc(&remsim_server_client_fsm, ctx, conn, LOGL_DEBUG, NULL);
}
static __attribute__((constructor)) void on_dso_load(void)
{
OSMO_ASSERT(osmo_fsm_register(&remsim_server_client_fsm) == 0);
}
/***********************************************************************
* IPA RSPRO Server
***********************************************************************/
struct rspro_client_conn *_client_conn_by_slot(struct rspro_server *srv, const struct client_slot *cslot)
{
struct rspro_client_conn *conn;
llist_for_each_entry(conn, &srv->clients, list) {
if (client_slot_equals(&conn->client.slot, cslot))
return conn;
}
return NULL;
}
struct rspro_client_conn *client_conn_by_slot(struct rspro_server *srv, const struct client_slot *cslot)
{
struct rspro_client_conn *conn;
pthread_rwlock_rdlock(&srv->rwlock);
conn = _client_conn_by_slot(srv, cslot);
pthread_rwlock_unlock(&srv->rwlock);
return conn;
}
struct rspro_client_conn *_bankd_conn_by_id(struct rspro_server *srv, uint16_t bank_id)
{
struct rspro_client_conn *conn;
llist_for_each_entry(conn, &srv->banks, list) {
if (conn->bank.bank_id == bank_id)
return conn;
}
return NULL;
}
struct rspro_client_conn *bankd_conn_by_id(struct rspro_server *srv, uint16_t bank_id)
{
struct rspro_client_conn *conn;
pthread_rwlock_rdlock(&srv->rwlock);
conn = _bankd_conn_by_id(srv, bank_id);
pthread_rwlock_unlock(&srv->rwlock);
return conn;
}
static int handle_rx_rspro(struct rspro_client_conn *conn, const RsproPDU_t *pdu)
{
LOGPFSM(conn->fi, "Rx RSPRO %s\n", rspro_msgt_name(pdu));
switch (pdu->msg.present) {
case RsproPDUchoice_PR_connectClientReq:
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_CLIENT_CONN, (void *)pdu);
break;
case RsproPDUchoice_PR_connectBankReq:
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_BANK_CONN, (void *)pdu);
break;
case RsproPDUchoice_PR_createMappingRes:
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_CREATE_MAP_RES, (void *)pdu);
break;
case RsproPDUchoice_PR_removeMappingRes:
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_REMOVE_MAP_RES, (void *)pdu);
break;
case RsproPDUchoice_PR_configClientIdRes:
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_CONFIG_CL_RES, (void *)pdu);
break;
case RsproPDUchoice_PR_configClientBankRes:
/* TODO: store somewhere that client has ACKed? */
break;
default:
LOGPFSML(conn->fi, LOGL_ERROR, "Received unknown/unimplemented RSPRO msg_type %s\n",
rspro_msgt_name(pdu));
return -1;
}
return 0;
}
/* data was received from one of the client connections to the RSPRO socket */
static int sock_read_cb(struct ipa_server_conn *peer, struct msgb *msg)
{
struct ipaccess_head *hh = (struct ipaccess_head *) msg->data;
struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg);
struct rspro_client_conn *conn = peer->data;
RsproPDU_t *pdu;
int rc;
if (msgb_length(msg) < sizeof(*hh))
goto invalid;
msg->l2h = &hh->data[0];
switch (hh->proto) {
case IPAC_PROTO_IPACCESS:
rc = ipa_server_conn_ccm(peer, msg);
if (rc < 0)
break;
switch (hh->data[0]) {
case IPAC_MSGT_PONG:
ipa_keepalive_fsm_pong_received(conn->keepalive_fi);
rc = 0;
break;
default:
break;
}
break;
case IPAC_PROTO_OSMO:
if (!he || msgb_l2len(msg)< sizeof(*he))
goto invalid;
msg->l2h = &he->data[0];
switch (he->proto) {
case IPAC_PROTO_EXT_RSPRO:
pdu = rspro_dec_msg(msg);
if (!pdu)
goto invalid;
rc = handle_rx_rspro(conn, pdu);
ASN_STRUCT_FREE(asn_DEF_RsproPDU, pdu);
break;
default:
goto invalid;
}
break;
default:
goto invalid;
}
msgb_free(msg);
return rc;
invalid:
msgb_free(msg);
return -1;
}
static int sock_closed_cb(struct ipa_server_conn *peer)
{
struct rspro_client_conn *conn = peer->data;
if (conn->fi)
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_TCP_DOWN, NULL);
/* FIXME: who cleans up conn? */
/* ipa server code relases 'peer' just after this */
return 0;
}
static const struct ipa_keepalive_params ka_params = {
.interval = 30,
.wait_for_resp = 10,
};
/* a new TCP connection was accepted on the RSPRO server socket */
static int accept_cb(struct ipa_server_link *link, int fd)
{
struct rspro_server *srv = link->data;
struct rspro_client_conn *conn;
conn = talloc_zero(srv, struct rspro_client_conn);
OSMO_ASSERT(conn);
conn->srv = srv;
/* don't allocate peer under 'conn', as it must survive 'conn' during teardown */
conn->peer = ipa_server_conn_create(link, link, fd, sock_read_cb, sock_closed_cb, conn);
if (!conn->peer)
goto out_err;
/* don't allocate 'fi' as slave from 'conn', as 'fi' needs to survive 'conn' during
* teardown */
conn->fi = server_client_fsm_alloc(srv, conn);
if (!conn->fi)
goto out_err_conn;
/* use ipa_keepalive_fsm to periodically send an IPA_PING and expect a PONG in response */
conn->keepalive_fi = ipa_server_conn_alloc_keepalive_fsm(conn->peer, &ka_params, NULL);
if (!conn->keepalive_fi)
goto out_err_fi;
/* ensure parent is notified once keepalive FSM instance is dying */
osmo_fsm_inst_change_parent(conn->keepalive_fi, conn->fi, CLNTC_E_KA_TIMEOUT);
ipa_keepalive_fsm_start(conn->keepalive_fi);
INIT_LLIST_HEAD(&conn->bank.maps_new);
INIT_LLIST_HEAD(&conn->bank.maps_unack);
INIT_LLIST_HEAD(&conn->bank.maps_active);
INIT_LLIST_HEAD(&conn->bank.maps_delreq);
INIT_LLIST_HEAD(&conn->bank.maps_deleting);
pthread_rwlock_wrlock(&conn->srv->rwlock);
llist_add_tail(&conn->list, &srv->connections);
pthread_rwlock_unlock(&conn->srv->rwlock);
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_TCP_UP, NULL);
return 0;
out_err_fi:
osmo_fsm_inst_term(conn->fi, OSMO_FSM_TERM_ERROR, NULL);
out_err_conn:
ipa_server_conn_destroy(conn->peer);
/* the above will free 'conn' down the chain */
return -1;
out_err:
talloc_free(conn);
return -1;
}
/* call-back if we were triggered by a rest_api thread */
int event_fd_cb(struct osmo_fd *ofd, unsigned int what)
{
struct rspro_server *srv = ofd->data;
struct rspro_client_conn *conn;
bool non_empty_new, non_empty_del;
uint64_t value;
int rc;
/* read from the socket to "confirm" the event and make it non-readable again */
rc = read(ofd->fd, &value, 8);
if (rc < 8) {
LOGP(DMAIN, LOGL_ERROR, "Error reading eventfd: %d\n", rc);
return rc;
}
LOGP(DMAIN, LOGL_INFO, "Event FD arrived, checking for any pending work\n");
pthread_rwlock_rdlock(&srv->rwlock);
llist_for_each_entry(conn, &srv->banks, list) {
slotmaps_rdlock(srv->slotmaps);
non_empty_new = llist_empty(&conn->bank.maps_new);
non_empty_del = llist_empty(&conn->bank.maps_delreq);
slotmaps_unlock(srv->slotmaps);
/* trigger FSM to send any pending new/deleted maps */
if (non_empty_new || non_empty_del)
osmo_fsm_inst_dispatch(conn->fi, CLNTC_E_PUSH, NULL);
}
pthread_rwlock_unlock(&srv->rwlock);
return 0;
}
/* unlink all slotmaps from any of the lists of this conn->bank.maps_* */
static void _unlink_all_slotmaps(struct rspro_client_conn *conn)
{
struct slot_mapping *smap, *smap2;
llist_for_each_entry_safe(smap, smap2, &conn->bank.maps_new, bank_list) {
/* unlink from list and keep in state NEW */
_slotmap_state_change(smap, SLMAP_S_NEW, NULL);
}
llist_for_each_entry_safe(smap, smap2, &conn->bank.maps_unack, bank_list) {
/* unlink from list and change to state NEW */
_slotmap_state_change(smap, SLMAP_S_NEW, NULL);
}
llist_for_each_entry_safe(smap, smap2, &conn->bank.maps_active, bank_list) {
/* unlink from list and change to state NEW */
_slotmap_state_change(smap, SLMAP_S_NEW, NULL);
}
llist_for_each_entry_safe(smap, smap2, &conn->bank.maps_delreq, bank_list) {
/* unlink from list and delete */
_slotmap_del(smap->maps, smap);
}
llist_for_each_entry_safe(smap, smap2, &conn->bank.maps_deleting, bank_list) {
/* unlink from list and delete */
_slotmap_del(smap->maps, smap);
}
}
/* only to be used by the FSM cleanup. */
static void rspro_client_conn_destroy(struct rspro_client_conn *conn)
{
/* this will internally call closed_cb() which will dispatch a TCP_DOWN event */
ipa_server_conn_destroy(conn->peer);
conn->peer = NULL;
/* ensure all slotmaps are unlinked + returned to NEW or deleted */
slotmaps_wrlock(conn->srv->slotmaps);
_unlink_all_slotmaps(conn);
slotmaps_unlock(conn->srv->slotmaps);
pthread_rwlock_wrlock(&conn->srv->rwlock);
llist_del(&conn->list);
pthread_rwlock_unlock(&conn->srv->rwlock);
talloc_free(conn);
}
struct rspro_server *rspro_server_create(void *ctx, const char *host, uint16_t port)
{
struct rspro_server *srv = talloc_zero(ctx, struct rspro_server);
OSMO_ASSERT(srv);
pthread_rwlock_init(&srv->rwlock, NULL);
pthread_rwlock_wrlock(&srv->rwlock);
INIT_LLIST_HEAD(&srv->connections);
INIT_LLIST_HEAD(&srv->clients);
INIT_LLIST_HEAD(&srv->banks);
pthread_rwlock_unlock(&srv->rwlock);
srv->link = ipa_server_link_create(ctx, NULL, host, port, accept_cb, srv);
ipa_server_link_open(srv->link);
return srv;
}
void rspro_server_destroy(struct rspro_server *srv)
{
/* FIXME: clear all lists */
ipa_server_link_destroy(srv->link);
srv->link = NULL;
talloc_free(srv);
}