diff options
Diffstat (limited to 'src/libmsc/ran_conn.c')
| -rw-r--r-- | src/libmsc/ran_conn.c | 908 |
1 files changed, 82 insertions, 826 deletions
diff --git a/src/libmsc/ran_conn.c b/src/libmsc/ran_conn.c index 8ad183e0e..6e20403f7 100644 --- a/src/libmsc/ran_conn.c +++ b/src/libmsc/ran_conn.c @@ -30,883 +30,139 @@ #include <osmocom/msc/debug.h> #include <osmocom/msc/transaction.h> #include <osmocom/msc/signal.h> -#include <osmocom/msc/a_iface.h> #include <osmocom/msc/sgs_iface.h> -#include <osmocom/msc/iucs.h> +#include <osmocom/msc/ran_peer.h> +#include <osmocom/msc/sccp_ran.h> +#include <osmocom/msc/ran_infra.h> +#include <osmocom/msc/msub.h> -#include "../../bscconfig.h" -#ifdef BUILD_IU -#include <osmocom/ranap/iu_client.h> -#else -#include <osmocom/msc/iu_dummy.h> -#endif - -#define RAN_CONN_TIMEOUT 5 /* seconds */ - -static const struct value_string ran_conn_fsm_event_names[] = { - OSMO_VALUE_STRING(RAN_CONN_E_COMPLETE_LAYER_3), - OSMO_VALUE_STRING(RAN_CONN_E_CLASSMARK_UPDATE), - OSMO_VALUE_STRING(RAN_CONN_E_ACCEPTED), - OSMO_VALUE_STRING(RAN_CONN_E_COMMUNICATING), - OSMO_VALUE_STRING(RAN_CONN_E_RELEASE_WHEN_UNUSED), - OSMO_VALUE_STRING(RAN_CONN_E_MO_CLOSE), - OSMO_VALUE_STRING(RAN_CONN_E_CN_CLOSE), - OSMO_VALUE_STRING(RAN_CONN_E_UNUSED), - { 0, NULL } -}; - -static void update_counters(struct osmo_fsm_inst *fi, bool conn_accepted) -{ - struct ran_conn *conn = fi->priv; - switch (conn->complete_layer3_type) { - case COMPLETE_LAYER3_LU: - rate_ctr_inc(&conn->network->msc_ctrs->ctr[ - conn_accepted ? MSC_CTR_LOC_UPDATE_COMPLETED - : MSC_CTR_LOC_UPDATE_FAILED]); - break; - case COMPLETE_LAYER3_CM_SERVICE_REQ: - rate_ctr_inc(&conn->network->msc_ctrs->ctr[ - conn_accepted ? MSC_CTR_CM_SERVICE_REQUEST_ACCEPTED - : MSC_CTR_CM_SERVICE_REQUEST_REJECTED]); - break; - case COMPLETE_LAYER3_PAGING_RESP: - rate_ctr_inc(&conn->network->msc_ctrs->ctr[ - conn_accepted ? MSC_CTR_PAGING_RESP_ACCEPTED - : MSC_CTR_PAGING_RESP_REJECTED]); - break; - default: - break; - } -} - -static void evaluate_acceptance_outcome(struct osmo_fsm_inst *fi, bool conn_accepted) -{ - struct ran_conn *conn = fi->priv; - - update_counters(fi, conn_accepted); - - /* Trigger transactions that we paged for */ - if (conn->complete_layer3_type == COMPLETE_LAYER3_PAGING_RESP) { - subscr_paging_dispatch(GSM_HOOK_RR_PAGING, - conn_accepted ? GSM_PAGING_SUCCEEDED : GSM_PAGING_EXPIRED, - NULL, conn, conn->vsub); - } - - if (conn->complete_layer3_type == COMPLETE_LAYER3_CM_SERVICE_REQ - && conn_accepted) { - conn->received_cm_service_request = true; - ran_conn_get(conn, RAN_CONN_USE_CM_SERVICE); - } - - if (conn_accepted) - osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_ATTACHED, conn->vsub); -} - -static void log_close_event(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - enum gsm48_reject_value *cause = data; - /* The close event itself is logged by the FSM. We can only add the cause value, if present. */ - if (!cause || !*cause) - return; - LOGPFSML(fi, LOGL_NOTICE, "Close event, cause: %s\n", gsm48_reject_value_name(*cause)); -} - -static void ran_conn_fsm_new(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - switch (event) { - case RAN_CONN_E_COMPLETE_LAYER_3: - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_AUTH_CIPH, RAN_CONN_TIMEOUT, 0); - return; - - case RAN_CONN_E_ACCEPTED: - evaluate_acceptance_outcome(fi, true); - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_ACCEPTED, RAN_CONN_TIMEOUT, 0); - return; - - case RAN_CONN_E_MO_CLOSE: - case RAN_CONN_E_CN_CLOSE: - log_close_event(fi, event, data); - evaluate_acceptance_outcome(fi, false); - /* fall through */ - case RAN_CONN_E_UNUSED: - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_RELEASING, RAN_CONN_TIMEOUT, 0); - return; - - default: - OSMO_ASSERT(false); - } -} - -static void ran_conn_fsm_auth_ciph(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - /* If accepted, transition the state, all other cases mean failure. */ - switch (event) { - case RAN_CONN_E_ACCEPTED: - evaluate_acceptance_outcome(fi, true); - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_ACCEPTED, RAN_CONN_TIMEOUT, 0); - return; - - case RAN_CONN_E_UNUSED: - LOGPFSML(fi, LOGL_DEBUG, "Awaiting results for Auth+Ciph, overruling event %s\n", - osmo_fsm_event_name(fi->fsm, event)); - return; - - case RAN_CONN_E_MO_CLOSE: - case RAN_CONN_E_CN_CLOSE: - log_close_event(fi, event, data); - evaluate_acceptance_outcome(fi, false); - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_RELEASING, RAN_CONN_TIMEOUT, 0); - return; - - - default: - OSMO_ASSERT(false); - } -} - -int ran_conn_classmark_request_then_cipher_mode_cmd(struct ran_conn *conn, bool umts_aka, - bool retrieve_imeisv) +struct ran_conn *ran_conn_create_incoming(struct ran_peer *ran_peer, uint32_t sccp_conn_id) { - int rc; - conn->geran_set_cipher_mode.umts_aka = umts_aka; - conn->geran_set_cipher_mode.retrieve_imeisv = retrieve_imeisv; - - rc = a_iface_tx_classmark_request(conn); - if (rc) { - LOGP(DMM, LOGL_ERROR, "%s: cannot send BSSMAP Classmark Request\n", - vlr_subscr_name(conn->vsub)); - return -EIO; - } - - osmo_fsm_inst_state_chg(conn->fi, RAN_CONN_S_WAIT_CLASSMARK_UPDATE, RAN_CONN_TIMEOUT, 0); - return 0; -} - -static void ran_conn_fsm_wait_classmark_update(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - struct ran_conn *conn = fi->priv; - switch (event) { - case RAN_CONN_E_CLASSMARK_UPDATE: - /* Theoretically, this event can be used for requesting Classmark in various situations. - * So far though, the only time we send a Classmark Request is during Ciphering. As soon - * as more such situations arise, we need to add state to indicate what action should - * follow after a Classmark Update is received (e.g. - * ran_conn_classmark_request_then_cipher_mode_cmd() sets an enum value to indicate that - * Ciphering should continue afterwards). But right now, it is accurate to always - * continue with Ciphering: */ - - /* During Ciphering, we needed Classmark information. The Classmark Update has come in, - * go back into the Set Ciphering Command procedure. */ - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_AUTH_CIPH, RAN_CONN_TIMEOUT, 0); - if (ran_conn_geran_set_cipher_mode(conn, conn->geran_set_cipher_mode.umts_aka, - conn->geran_set_cipher_mode.retrieve_imeisv)) { - LOGPFSML(fi, LOGL_ERROR, - "Sending Cipher Mode Command failed, aborting attach\n"); - vlr_subscr_cancel_attach_fsm(conn->vsub, OSMO_FSM_TERM_ERROR, - GSM48_REJECT_NETWORK_FAILURE); - } - return; + struct ran_conn *conn; - case RAN_CONN_E_UNUSED: - LOGPFSML(fi, LOGL_DEBUG, "Awaiting results for Auth+Ciph, overruling event %s\n", - osmo_fsm_event_name(fi->fsm, event)); - return; + conn = talloc_zero(ran_peer, struct ran_conn); + OSMO_ASSERT(conn); - case RAN_CONN_E_MO_CLOSE: - case RAN_CONN_E_CN_CLOSE: - log_close_event(fi, event, data); - evaluate_acceptance_outcome(fi, false); - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_RELEASING, RAN_CONN_TIMEOUT, 0); - return; + *conn = (struct ran_conn){ + .ran_peer = ran_peer, + .sccp_conn_id = sccp_conn_id, + }; - default: - OSMO_ASSERT(false); - } + llist_add(&conn->entry, &ran_peer->sri->ran_conns); + return conn; } -static bool ran_conn_fsm_has_active_transactions(struct osmo_fsm_inst *fi) +struct ran_conn *ran_conn_create_outgoing(struct ran_peer *ran_peer) { - struct ran_conn *conn = fi->priv; - struct gsm_trans *trans; - - if (conn->silent_call) { - LOGPFSML(fi, LOGL_DEBUG, "%s: silent call still active\n", __func__); - return true; - } + /* FIXME use method being developed in gerrit id Ifd55c6b7ed2558ff072042079cf45f5068a971de */ + static uint32_t next_outgoing_conn_id = 2342; + uint32_t conn_id = 0; + int attempts = 1000; + bool already_used = true; + while (attempts--) { + struct ran_conn *conn; - if (conn->received_cm_service_request) { - LOGPFSML(fi, LOGL_DEBUG, "%s: still awaiting first request after a CM Service Request\n", - __func__); - return true; - } + conn_id = next_outgoing_conn_id; + next_outgoing_conn_id++; - if (conn->vsub && !llist_empty(&conn->vsub->cs.requests)) { - struct subscr_request *sr; - if (!log_check_level(fi->fsm->log_subsys, LOGL_DEBUG)) { - llist_for_each_entry(sr, &conn->vsub->cs.requests, entry) { - LOGPFSML(fi, LOGL_DEBUG, "%s: still active: %s\n", - __func__, sr->label); + already_used = false; + llist_for_each_entry(conn, &ran_peer->sri->ran_conns, entry) { + if (conn->sccp_conn_id == conn_id) { + already_used = true; + break; } } - return true; - } - - if ((trans = trans_has_conn(conn))) { - LOGPFSML(fi, LOGL_DEBUG, - "%s: connection still has active transaction: %s\n", - __func__, gsm48_pdisc_name(trans->protocol)); - return true; - } - - return false; -} - -static void ran_conn_fsm_accepted_enter(struct osmo_fsm_inst *fi, uint32_t prev_state) -{ - struct ran_conn *conn = fi->priv; - - /* Stop Location Update expiry for this subscriber. While the subscriber - * has an open connection the LU expiry timer must remain disabled. - * Otherwise we would kick the subscriber off the network when the timer - * expires e.g. during a long phone call. - * The LU expiry timer will restart once the connection is closed. */ - conn->vsub->expire_lu = VLR_SUBSCRIBER_NO_EXPIRATION; - - if (!ran_conn_fsm_has_active_transactions(fi)) - osmo_fsm_inst_dispatch(fi, RAN_CONN_E_UNUSED, NULL); -} - -static void ran_conn_fsm_accepted(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - switch (event) { - case RAN_CONN_E_COMPLETE_LAYER_3: - /* When Authentication is off, we may already be in the Accepted state when the code - * evaluates the Compl L3. Simply ignore. This just cosmetically mutes the error log - * about the useless event. */ - return; - - case RAN_CONN_E_COMMUNICATING: - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_COMMUNICATING, 0, 0); - return; - - case RAN_CONN_E_MO_CLOSE: - case RAN_CONN_E_CN_CLOSE: - log_close_event(fi, event, data); - /* fall through */ - case RAN_CONN_E_UNUSED: - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_RELEASING, RAN_CONN_TIMEOUT, 0); - return; - - default: - OSMO_ASSERT(false); - } -} - -static void ran_conn_fsm_communicating(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - switch (event) { - case RAN_CONN_E_COMMUNICATING: - /* no-op */ - return; - - case RAN_CONN_E_MO_CLOSE: - case RAN_CONN_E_CN_CLOSE: - log_close_event(fi, event, data); - /* fall through */ - case RAN_CONN_E_UNUSED: - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_RELEASING, RAN_CONN_TIMEOUT, 0); - return; - - default: - OSMO_ASSERT(false); - } -} - -static int ran_conn_fsm_timeout(struct osmo_fsm_inst *fi) -{ - struct ran_conn *conn = fi->priv; - if (ran_conn_in_release(conn)) { - LOGPFSML(fi, LOGL_ERROR, "Timeout while releasing, discarding right now\n"); - osmo_fsm_inst_term(fi, OSMO_FSM_TERM_TIMEOUT, NULL); - } else { - enum gsm48_reject_value cause = GSM48_REJECT_CONGESTION; - osmo_fsm_inst_dispatch(fi, RAN_CONN_E_CN_CLOSE, &cause); - } - return 0; -} - -static void ran_conn_fsm_releasing_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) -{ - struct ran_conn *conn = fi->priv; - - /* The SGs interface needs to access vsub struct members to send the - * release message, however the following release procedures will - * remove conn->vsub, so we need to send the release right now. */ - if (conn->via_ran == OSMO_RAT_EUTRAN_SGS) { - sgs_iface_tx_release(conn); - } - - /* Use count for either conn->a.waiting_for_clear_complete or - * conn->iu.waiting_for_release_complete. 'get' it early, so we don't deallocate after tearing - * down active transactions. Safeguard against double-get (though it shouldn't happen). */ - if (!ran_conn_used_by(conn, RAN_CONN_USE_RELEASE)) - ran_conn_get(conn, RAN_CONN_USE_RELEASE); - - /* Cancel pending CM Service Requests */ - if (conn->received_cm_service_request) { - conn->received_cm_service_request = false; - ran_conn_put(conn, RAN_CONN_USE_CM_SERVICE); - } - - /* Cancel all VLR FSMs, if any */ - vlr_subscr_cancel_attach_fsm(conn->vsub, OSMO_FSM_TERM_ERROR, GSM48_REJECT_CONGESTION); - - if (conn->vsub) { - /* The subscriber has no active connection anymore. - * Restart the periodic Location Update expiry timer for this subscriber. */ - vlr_subscr_enable_expire_lu(conn->vsub); - } - /* If we're closing in a middle of a trans, we need to clean up */ - trans_conn_closed(conn); - - switch (conn->via_ran) { - case OSMO_RAT_GERAN_A: - a_iface_tx_clear_cmd(conn); - if (conn->a.waiting_for_clear_complete) { - LOGPFSML(fi, LOGL_ERROR, - "Unexpected: conn is already waiting for BSSMAP Clear Complete\n"); - break; - } - conn->a.waiting_for_clear_complete = true; - break; - case OSMO_RAT_UTRAN_IU: - ranap_iu_tx_release(conn->iu.ue_ctx, NULL); - if (conn->iu.waiting_for_release_complete) { - LOGPFSML(fi, LOGL_ERROR, - "Unexpected: conn is already waiting for Iu Release Complete\n"); + if (!already_used) break; - } - conn->iu.waiting_for_release_complete = true; - break; - case OSMO_RAT_EUTRAN_SGS: - /* Release message is already sent at the beginning of this - * functions (see above), but we still need to notify the - * conn that a release has been sent / is in progress. */ - ran_conn_sgs_release_sent(conn); - break; - default: - LOGP(DMM, LOGL_ERROR, "%s: Unknown RAN type, cannot tx release/clear\n", - vlr_subscr_name(conn->vsub)); - break; } + if (already_used) + return NULL; + LOG_RAN_PEER(ran_peer, LOGL_DEBUG, "Outgoing conn id: %u\n", conn_id); + return ran_conn_create_incoming(ran_peer, conn_id); } -static void ran_conn_fsm_releasing(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - OSMO_ASSERT(event == RAN_CONN_E_UNUSED); - osmo_fsm_inst_state_chg(fi, RAN_CONN_S_RELEASED, 0, 0); -} - -static void ran_conn_fsm_released(struct osmo_fsm_inst *fi, uint32_t prev_state) -{ - /* Terminate, deallocate and also deallocate the ran_conn, which is allocated as - * a talloc child of fi. Also calls the cleanup function. */ - osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, NULL); -} - -#define S(x) (1 << (x)) - -static const struct osmo_fsm_state ran_conn_fsm_states[] = { - [RAN_CONN_S_NEW] = { - .name = OSMO_STRINGIFY(RAN_CONN_S_NEW), - .in_event_mask = S(RAN_CONN_E_COMPLETE_LAYER_3) | - S(RAN_CONN_E_ACCEPTED) | - S(RAN_CONN_E_MO_CLOSE) | - S(RAN_CONN_E_CN_CLOSE) | - S(RAN_CONN_E_UNUSED), - .out_state_mask = S(RAN_CONN_S_AUTH_CIPH) | - S(RAN_CONN_S_ACCEPTED) | - S(RAN_CONN_S_RELEASING), - .action = ran_conn_fsm_new, - }, - [RAN_CONN_S_AUTH_CIPH] = { - .name = OSMO_STRINGIFY(RAN_CONN_S_AUTH_CIPH), - .in_event_mask = S(RAN_CONN_E_ACCEPTED) | - S(RAN_CONN_E_MO_CLOSE) | - S(RAN_CONN_E_CN_CLOSE) | - S(RAN_CONN_E_UNUSED), - .out_state_mask = S(RAN_CONN_S_WAIT_CLASSMARK_UPDATE) | - S(RAN_CONN_S_ACCEPTED) | - S(RAN_CONN_S_RELEASING), - .action = ran_conn_fsm_auth_ciph, - }, - [RAN_CONN_S_WAIT_CLASSMARK_UPDATE] = { - .name = OSMO_STRINGIFY(RAN_CONN_S_WAIT_CLASSMARK_UPDATE), - .in_event_mask = S(RAN_CONN_E_CLASSMARK_UPDATE) | - S(RAN_CONN_E_MO_CLOSE) | - S(RAN_CONN_E_CN_CLOSE) | - S(RAN_CONN_E_UNUSED), - .out_state_mask = S(RAN_CONN_S_AUTH_CIPH) | - S(RAN_CONN_S_RELEASING), - .action = ran_conn_fsm_wait_classmark_update, - }, - [RAN_CONN_S_ACCEPTED] = { - .name = OSMO_STRINGIFY(RAN_CONN_S_ACCEPTED), - /* allow everything to release for any odd behavior */ - .in_event_mask = S(RAN_CONN_E_COMPLETE_LAYER_3) | - S(RAN_CONN_E_COMMUNICATING) | - S(RAN_CONN_E_RELEASE_WHEN_UNUSED) | - S(RAN_CONN_E_ACCEPTED) | - S(RAN_CONN_E_MO_CLOSE) | - S(RAN_CONN_E_CN_CLOSE) | - S(RAN_CONN_E_UNUSED), - .out_state_mask = S(RAN_CONN_S_RELEASING) | - S(RAN_CONN_S_COMMUNICATING), - .onenter = ran_conn_fsm_accepted_enter, - .action = ran_conn_fsm_accepted, - }, - [RAN_CONN_S_COMMUNICATING] = { - .name = OSMO_STRINGIFY(RAN_CONN_S_COMMUNICATING), - /* allow everything to release for any odd behavior */ - .in_event_mask = S(RAN_CONN_E_RELEASE_WHEN_UNUSED) | - S(RAN_CONN_E_ACCEPTED) | - S(RAN_CONN_E_COMMUNICATING) | - S(RAN_CONN_E_MO_CLOSE) | - S(RAN_CONN_E_CN_CLOSE) | - S(RAN_CONN_E_UNUSED), - .out_state_mask = S(RAN_CONN_S_RELEASING), - .action = ran_conn_fsm_communicating, - }, - [RAN_CONN_S_RELEASING] = { - .name = OSMO_STRINGIFY(RAN_CONN_S_RELEASING), - .in_event_mask = S(RAN_CONN_E_UNUSED), - .out_state_mask = S(RAN_CONN_S_RELEASED), - .onenter = ran_conn_fsm_releasing_onenter, - .action = ran_conn_fsm_releasing, - }, - [RAN_CONN_S_RELEASED] = { - .name = OSMO_STRINGIFY(RAN_CONN_S_RELEASED), - .onenter = ran_conn_fsm_released, - }, -}; - -static void ran_conn_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause); - -static struct osmo_fsm ran_conn_fsm = { - .name = "RAN_conn", - .states = ran_conn_fsm_states, - .num_states = ARRAY_SIZE(ran_conn_fsm_states), - .allstate_event_mask = 0, - .allstate_action = NULL, - .log_subsys = DMM, - .event_names = ran_conn_fsm_event_names, - .cleanup = ran_conn_fsm_cleanup, - .timer_cb = ran_conn_fsm_timeout, -}; - /* Return statically allocated string of the ran_conn RAT type and id. */ -const char *ran_conn_get_conn_id(struct ran_conn *conn) +const char *ran_conn_name(struct ran_conn *conn) { static char id[42]; int rc; - uint32_t conn_id; + const char *ran_peer_name; - switch (conn->via_ran) { - case OSMO_RAT_GERAN_A: - conn_id = conn->a.conn_id; - break; - case OSMO_RAT_UTRAN_IU: - conn_id = iu_get_conn_id(conn->iu.ue_ctx); - break; - default: - return "ran-unknown"; - } + if (!conn) + return "ran_conn==NULL"; + + if (!conn->ran_peer || !conn->ran_peer->sri || !conn->ran_peer->sri->ran) + ran_peer_name = "no-RAN-peer"; + else + ran_peer_name = osmo_rat_type_name(conn->ran_peer->sri->ran->type); - rc = snprintf(id, sizeof(id), "%s-%u", osmo_rat_type_name(conn->via_ran), conn_id); + rc = snprintf(id, sizeof(id), "%s-%u", ran_peer_name, conn->sccp_conn_id); /* < 0 is error, == 0 is empty, >= size means truncation. Not really expecting this to catch on in any practical * situation. */ - if (rc <= 0 || rc >= sizeof(id)) { - LOGP(DMM, LOGL_ERROR, "Error with conn id; rc=%d\n", rc); - return "conn-id-error"; - } + if (rc <= 0 || rc >= sizeof(id)) + return "conn-name-error"; return id; } -/* Tidy up before the FSM deallocates */ -static void ran_conn_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause) +int ran_conn_down_l2_co(struct ran_conn *conn, struct msgb *l3, bool initial) { - struct ran_conn *conn = fi->priv; - - if (ran_conn_fsm_has_active_transactions(fi)) { - LOGPFSML(fi, LOGL_ERROR, "Deallocating despite active transactions\n"); - trans_conn_closed(conn); - } - - if (!conn) { - LOGP(DRLL, LOGL_ERROR, "Freeing NULL RAN connection\n"); - return; - } - - if (conn->vsub) { - DEBUGP(DRLL, "%s: Freeing RAN connection\n", vlr_subscr_name(conn->vsub)); - conn->vsub->lu_fsm = NULL; - conn->vsub->msc_conn_ref = NULL; - vlr_subscr_put(conn->vsub, VSUB_USE_CONN); - conn->vsub = NULL; - } else - DEBUGP(DRLL, "Freeing RAN connection with NULL subscriber\n"); - - llist_del(&conn->entry); -} - -/* Signal success of Complete Layer 3. Allow to keep the conn open for Auth and Ciph. */ -void ran_conn_complete_layer_3(struct ran_conn *conn) -{ - if (!conn) - return; - osmo_fsm_inst_dispatch(conn->fi, RAN_CONN_E_COMPLETE_LAYER_3, NULL); -} - -void ran_conn_release_when_unused(struct ran_conn *conn) -{ - if (!conn) - return; - if (ran_conn_in_release(conn)) { - DEBUGP(DMM, "%s: %s: conn already in release (%s)\n", - vlr_subscr_name(conn->vsub), __func__, - osmo_fsm_inst_state_name(conn->fi)); - return; - } - if (conn->fi->state == RAN_CONN_S_NEW) { - DEBUGP(DMM, "%s: %s: conn still being established (%s)\n", - vlr_subscr_name(conn->vsub), __func__, - osmo_fsm_inst_state_name(conn->fi)); - return; - } - osmo_fsm_inst_dispatch(conn->fi, RAN_CONN_E_RELEASE_WHEN_UNUSED, NULL); -} - -static void conn_close(struct ran_conn *conn, uint32_t cause, uint32_t event) -{ - if (!conn) { - LOGP(DMM, LOGL_ERROR, "Cannot release NULL connection\n"); - return; - } - if (ran_conn_in_release(conn)) { - DEBUGP(DMM, "%s(vsub=%s, cause=%u): already in release, ignore.\n", - __func__, vlr_subscr_name(conn->vsub), cause); - return; - } - osmo_fsm_inst_dispatch(conn->fi, event, &cause); -} - -void ran_conn_close(struct ran_conn *conn, uint32_t cause) -{ - return conn_close(conn, cause, RAN_CONN_E_CN_CLOSE); -} - -void ran_conn_mo_close(struct ran_conn *conn, uint32_t cause) -{ - return conn_close(conn, cause, RAN_CONN_E_MO_CLOSE); -} - -bool ran_conn_in_release(struct ran_conn *conn) -{ - if (!conn || !conn->fi) - return true; - if (conn->fi->state == RAN_CONN_S_RELEASING) - return true; - if (conn->fi->state == RAN_CONN_S_RELEASED) - return true; - return false; -} - -bool ran_conn_is_accepted(const struct ran_conn *conn) -{ - if (!conn) - return false; - if (!conn->vsub) - return false; - if (!(conn->fi->state == RAN_CONN_S_ACCEPTED - || conn->fi->state == RAN_CONN_S_COMMUNICATING)) - return false; - return true; -} - -/* Indicate that *some* communication is happening with the phone, so that the conn FSM no longer times - * out to release within a few seconds. */ -void ran_conn_communicating(struct ran_conn *conn) -{ - osmo_fsm_inst_dispatch(conn->fi, RAN_CONN_E_COMMUNICATING, NULL); -} - -void ran_conn_init(void) -{ - osmo_fsm_register(&ran_conn_fsm); -} - -/* Allocate a new RAN conn and FSM. - * Deallocation is by ran_conn_put(): when the use count reaches zero, the - * RAN_CONN_E_RELEASE_COMPLETE event is dispatched, the FSM terminates and deallocates both FSM and - * conn. As long as the FSM is waiting for responses from the subscriber, it will itself hold a use count - * on the conn. */ -struct ran_conn *ran_conn_alloc(struct gsm_network *network, - enum osmo_rat_type via_ran, uint16_t lac) -{ - struct ran_conn *conn; - struct osmo_fsm_inst *fi; - - fi = osmo_fsm_inst_alloc(&ran_conn_fsm, network, NULL, LOGL_DEBUG, NULL); - if (!fi) { - LOGP(DMM, LOGL_ERROR, "Failed to allocate conn FSM\n"); - return NULL; - } - - conn = talloc_zero(fi, struct ran_conn); - if (!conn) { - osmo_fsm_inst_free(fi); - return NULL; - } - - *conn = (struct ran_conn){ - .network = network, - .via_ran = via_ran, - .lac = lac, - .fi = fi, + struct ran_peer_ev_ctx co = { + .conn_id = conn->sccp_conn_id, + .conn = conn, + .msg = l3, }; - - switch (via_ran) { - case OSMO_RAT_GERAN_A: - conn->log_subsys = DBSSAP; - break; - case OSMO_RAT_UTRAN_IU: - conn->log_subsys = DRANAP; - break; - case OSMO_RAT_EUTRAN_SGS: - conn->log_subsys = DSGS; - break; - default: - conn->log_subsys = DMSC; - break; - } - - fi->priv = conn; - llist_add_tail(&conn->entry, &network->ran_conns); - return conn; + if (!conn->ran_peer) + return -EIO; + return osmo_fsm_inst_dispatch(conn->ran_peer->fi, + initial ? RAN_PEER_EV_MSG_DOWN_CO_INITIAL : RAN_PEER_EV_MSG_DOWN_CO, + &co); } -bool ran_conn_is_establishing_auth_ciph(const struct ran_conn *conn) +void ran_conn_msc_role_gone(struct ran_conn *conn, struct osmo_fsm_inst *msc_role) { if (!conn) - return false; - return conn->fi->state == RAN_CONN_S_AUTH_CIPH; -} - - -const struct value_string complete_layer3_type_names[] = { - { COMPLETE_LAYER3_NONE, "NONE" }, - { COMPLETE_LAYER3_LU, "LU" }, - { COMPLETE_LAYER3_CM_SERVICE_REQ, "CM_SERVICE_REQ" }, - { COMPLETE_LAYER3_PAGING_RESP, "PAGING_RESP" }, - { 0, NULL } -}; - -static void _ran_conn_update_id(struct ran_conn *conn, const char *subscr_identity) -{ - struct vlr_subscr *vsub = conn->vsub; - - if (osmo_fsm_inst_update_id_f(conn->fi, "%s:%s:%s", - subscr_identity, - ran_conn_get_conn_id(conn), - complete_layer3_type_name(conn->complete_layer3_type)) - != 0) - return; /* osmo_fsm_inst_update_id_f() will log an error. */ - - if (vsub) { - if (vsub->lu_fsm) - osmo_fsm_inst_update_id(vsub->lu_fsm, conn->fi->id); - if (vsub->auth_fsm) - osmo_fsm_inst_update_id(vsub->auth_fsm, conn->fi->id); - if (vsub->proc_arq_fsm) - osmo_fsm_inst_update_id(vsub->proc_arq_fsm, conn->fi->id); - } - - LOGPFSML(conn->fi, LOGL_DEBUG, "Updated ID\n"); -} - -/* Compose an ID almost like gsm48_mi_to_string(), but print the MI type along, and print a TMSI as hex. */ -void ran_conn_update_id_from_mi(struct ran_conn *conn, const uint8_t *mi, uint8_t mi_len) -{ - _ran_conn_update_id(conn, osmo_mi_name(mi, mi_len)); -} - -/* Update ran_conn->fi id string from current conn->vsub and conn->complete_layer3_type. */ -void ran_conn_update_id(struct ran_conn *conn) -{ - _ran_conn_update_id(conn, vlr_subscr_name(conn->vsub)); -} - -/* Iterate all ran_conn instances that are relevant for this subscriber, and update FSM ID strings for all of the FSM - * instances. */ -void ran_conn_update_id_for_vsub(struct vlr_subscr *for_vsub) -{ - struct gsm_network *network; - struct ran_conn *conn; - if (!for_vsub) return; - network = for_vsub->vlr->user_ctx; - OSMO_ASSERT(network); + if (conn->msc_role != msc_role) + return; - llist_for_each_entry(conn, &network->ran_conns, entry) { - if (conn->vsub == for_vsub) - ran_conn_update_id(conn); - } + conn->msc_role = NULL; + ran_conn_close(conn); } -static void rx_close_complete(struct ran_conn *conn, const char *label, bool *flag) +/* Regularly close the conn */ +void ran_conn_close(struct ran_conn *conn) { if (!conn) return; - if (!ran_conn_in_release(conn)) { - LOGPFSML(conn->fi, LOGL_ERROR, "Received unexpected %s, discarding right now\n", - label); - trans_conn_closed(conn); - osmo_fsm_inst_term(conn->fi, OSMO_FSM_TERM_ERROR, NULL); + if (conn->closing) return; - } - if (*flag) { - *flag = false; - ran_conn_put(conn, RAN_CONN_USE_RELEASE); - } -} + conn->closing = true; + LOG_RAN_PEER(conn->ran_peer, LOGL_DEBUG, "Closing %s\n", ran_conn_name(conn)); -void ran_conn_rx_bssmap_clear_complete(struct ran_conn *conn) -{ - rx_close_complete(conn, "BSSMAP Clear Complete", &conn->a.waiting_for_clear_complete); -} - -void ran_conn_rx_iu_release_complete(struct ran_conn *conn) -{ - rx_close_complete(conn, "Iu Release Complete", &conn->iu.waiting_for_release_complete); -} - -void ran_conn_sgs_release_sent(struct ran_conn *conn) -{ - bool dummy_waiting_for_release_complete = true; - - /* Note: In SGsAP there is no confirmation of a release. */ - rx_close_complete(conn, "SGs Release Complete", &dummy_waiting_for_release_complete); -} - -const struct value_string ran_conn_use_names[] = { - { RAN_CONN_USE_UNTRACKED, "UNTRACKED" }, - { RAN_CONN_USE_COMPL_L3, "compl_l3" }, - { RAN_CONN_USE_DTAP, "dtap" }, - { RAN_CONN_USE_AUTH_CIPH, "auth+ciph" }, - { RAN_CONN_USE_CM_SERVICE, "cm_service" }, - { RAN_CONN_USE_TRANS_CC, "trans_cc" }, - { RAN_CONN_USE_TRANS_SMS, "trans_sms" }, - { RAN_CONN_USE_TRANS_NC_SS, "trans_nc_ss" }, - { RAN_CONN_USE_SILENT_CALL, "silent_call" }, - { RAN_CONN_USE_RELEASE, "release" }, - { 0, NULL } -}; - -static const char *used_ref_counts_str(struct ran_conn *conn) -{ - static char buf[256]; - int bit_nr; - char *pos = buf; - *pos = '\0'; - - if (conn->use_tokens < 0) - return "invalid"; - -#define APPEND_STR(fmt, args...) do { \ - int remain = sizeof(buf) - (pos - buf) - 1; \ - int l = -1; \ - if (remain > 0) \ - l = snprintf(pos, remain, "%s" fmt, (pos == buf? "" : ","), ##args); \ - if (l < 0 || l > remain) { \ - buf[sizeof(buf) - 1] = '\0'; \ - return buf; \ - } \ - pos += l; \ - } while(0) - - for (bit_nr = 0; (1 << bit_nr) <= conn->use_tokens; bit_nr++) { - if (conn->use_tokens & (1 << bit_nr)) { - APPEND_STR("%s", get_value_string(ran_conn_use_names, bit_nr)); - } + if (conn->msc_role) { + osmo_fsm_inst_dispatch(conn->msc_role, MSC_EV_FROM_RAN_CONN_RELEASED, NULL); + conn->msc_role = NULL; } - return buf; -#undef APPEND_STR -} - -/* increment the ref-count. Needs to be called by every user */ -struct ran_conn *_ran_conn_get(struct ran_conn *conn, enum ran_conn_use balance_token, - const char *file, int line) -{ - OSMO_ASSERT(conn); - if (balance_token != RAN_CONN_USE_UNTRACKED) { - uint32_t flag = 1 << balance_token; - OSMO_ASSERT(balance_token < 32); - if (conn->use_tokens & flag) - LOGPSRC(DREF, LOGL_ERROR, file, line, - "%s: MSC conn use error: using an already used token: %s\n", - vlr_subscr_name(conn->vsub), - ran_conn_use_name(balance_token)); - conn->use_tokens |= flag; + if (conn->ran_peer) { + /* Todo: pass a useful SCCP cause? */ + sccp_ran_disconnect(conn->ran_peer->sri, conn->sccp_conn_id, 0); + conn->ran_peer = NULL; } - conn->use_count++; - LOGPSRC(DREF, LOGL_DEBUG, file, line, - "%s: MSC conn use + %s == %u (0x%x: %s)\n", - vlr_subscr_name(conn->vsub), ran_conn_use_name(balance_token), - conn->use_count, conn->use_tokens, used_ref_counts_str(conn)); - - return conn; + LOG_RAN_PEER(conn->ran_peer, LOGL_DEBUG, "Deallocating %s\n", ran_conn_name(conn)); + llist_del(&conn->entry); + talloc_free(conn); } -/* decrement the ref-count. Once it reaches zero, we release */ -void _ran_conn_put(struct ran_conn *conn, enum ran_conn_use balance_token, - const char *file, int line) +/* Same as ran_conn_close() but without sending any SCCP messages (e.g. after RESET) */ +void ran_conn_discard(struct ran_conn *conn) { - OSMO_ASSERT(conn); - - if (balance_token != RAN_CONN_USE_UNTRACKED) { - uint32_t flag = 1 << balance_token; - OSMO_ASSERT(balance_token < 32); - if (!(conn->use_tokens & flag)) - LOGPSRC(DREF, LOGL_ERROR, file, line, - "%s: MSC conn use error: freeing an unused token: %s\n", - vlr_subscr_name(conn->vsub), - ran_conn_use_name(balance_token)); - conn->use_tokens &= ~flag; - } - - if (conn->use_count == 0) { - LOGPSRC(DREF, LOGL_ERROR, file, line, - "%s: MSC conn use - %s failed: is already 0\n", - vlr_subscr_name(conn->vsub), - ran_conn_use_name(balance_token)); + if (!conn) return; - } - - conn->use_count--; - LOGPSRC(DREF, LOGL_DEBUG, file, line, - "%s: MSC conn use - %s == %u (0x%x: %s)\n", - vlr_subscr_name(conn->vsub), ran_conn_use_name(balance_token), - conn->use_count, conn->use_tokens, used_ref_counts_str(conn)); - - if (conn->use_count == 0) - osmo_fsm_inst_dispatch(conn->fi, RAN_CONN_E_UNUSED, NULL); -} - -bool ran_conn_used_by(struct ran_conn *conn, enum ran_conn_use token) -{ - return conn && (conn->use_tokens & (1 << token)); + /* Make sure to drop dead and don't dispatch things like DISCONNECT requests on SCCP. */ + conn->ran_peer = NULL; + ran_conn_close(conn); } |