<p>laforge has uploaded this change for <strong>review</strong>.</p><p><a href="https://gerrit.osmocom.org/c/libosmocore/+/23405">View Change</a></p><pre style="font-family: monospace,monospace; white-space: pre-wrap;">gprs_ns2_sns: Support for SGSN-side IP-SNS<br><br>This adds the core functionality of implementing the SGSN-side of IP-SNS<br>inside a new FSM. The SGSN-side FSM shares states, events, structures<br>and code with the BSS-side whenever possible.<br><br>Note that this commit does not yet use the SGSN-side FSM, that is part<br>of subsequent commits.<br><br>Closes: OS#3373<br>Change-Id: I780413ffacd9cb71f64cc38057aae781eeb59b2b<br>---<br>M src/gb/gprs_ns2_internal.h<br>M src/gb/gprs_ns2_sns.c<br>2 files changed, 277 insertions(+), 5 deletions(-)<br><br></pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;">git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/05/23405/1</pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;"><span>diff --git a/src/gb/gprs_ns2_internal.h b/src/gb/gprs_ns2_internal.h</span><br><span>index 688a587..9b138e5 100644</span><br><span>--- a/src/gb/gprs_ns2_internal.h</span><br><span>+++ b/src/gb/gprs_ns2_internal.h</span><br><span>@@ -364,6 +364,7 @@</span><br><span> int ns2_sns_rx(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp);</span><br><span> struct osmo_fsm_inst *ns2_sns_bss_fsm_alloc(struct gprs_ns2_nse *nse,</span><br><span> const char *id);</span><br><span style="color: hsl(120, 100%, 40%);">+struct osmo_fsm_inst *ns2_sns_sgsn_fsm_alloc(struct gprs_ns2_nse *nse, const char *id);</span><br><span> void ns2_sns_replace_nsvc(struct gprs_ns2_vc *nsvc);</span><br><span> void ns2_sns_notify_alive(struct gprs_ns2_nse *nse, struct gprs_ns2_vc *nsvc, bool alive);</span><br><span> void ns2_sns_update_weights(struct gprs_ns2_vc_bind *bind);</span><br><span>diff --git a/src/gb/gprs_ns2_sns.c b/src/gb/gprs_ns2_sns.c</span><br><span>index 1df8fc0..9be0909 100644</span><br><span>--- a/src/gb/gprs_ns2_sns.c</span><br><span>+++ b/src/gb/gprs_ns2_sns.c</span><br><span>@@ -61,12 +61,19 @@</span><br><span> IPv6,</span><br><span> };</span><br><span> </span><br><span style="color: hsl(120, 100%, 40%);">+enum ns2_sns_role {</span><br><span style="color: hsl(120, 100%, 40%);">+ GPRS_SNS_ROLE_BSS,</span><br><span style="color: hsl(120, 100%, 40%);">+ GPRS_SNS_ROLE_SGSN,</span><br><span style="color: hsl(120, 100%, 40%);">+};</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span> enum gprs_sns_bss_state {</span><br><span> GPRS_SNS_ST_UNCONFIGURED,</span><br><span> GPRS_SNS_ST_SIZE, /*!< SNS-SIZE procedure ongoing */</span><br><span> GPRS_SNS_ST_CONFIG_BSS, /*!< SNS-CONFIG procedure (BSS->SGSN) ongoing */</span><br><span> GPRS_SNS_ST_CONFIG_SGSN, /*!< SNS-CONFIG procedure (SGSN->BSS) ongoing */</span><br><span> GPRS_SNS_ST_CONFIGURED,</span><br><span style="color: hsl(120, 100%, 40%);">+ GPRS_SNS_ST_SGSN_WAIT_CONFIG, /* !< SGSN role: Wait for CONFIG from BSS */</span><br><span style="color: hsl(120, 100%, 40%);">+ GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK, /* !< SGSN role: Wait for CONFIG-ACK from BSS */</span><br><span> };</span><br><span> </span><br><span> enum gprs_sns_event {</span><br><span>@@ -118,6 +125,7 @@</span><br><span> struct gprs_ns2_nse *nse;</span><br><span> </span><br><span> enum ns2_sns_type ip;</span><br><span style="color: hsl(120, 100%, 40%);">+ enum ns2_sns_role role; /* local role: BSS or SGSN */</span><br><span> </span><br><span> /* holds the list of initial SNS endpoints */</span><br><span> struct llist_head sns_endpoints;</span><br><span>@@ -738,7 +746,7 @@</span><br><span> struct gprs_ns_ie_ip6_elem *ip6_elems;</span><br><span> struct gprs_ns2_vc_bind *bind;</span><br><span> struct ns2_sns_bind *sbind;</span><br><span style="color: hsl(0, 100%, 40%);">- struct osmo_sockaddr *remote;</span><br><span style="color: hsl(120, 100%, 40%);">+ const struct osmo_sockaddr *remote;</span><br><span> const struct osmo_sockaddr *sa;</span><br><span> struct osmo_sockaddr local;</span><br><span> int count;</span><br><span>@@ -746,10 +754,12 @@</span><br><span> ns2_clear_ipv46_entries(gss);</span><br><span> </span><br><span> /* no initial available */</span><br><span style="color: hsl(0, 100%, 40%);">- if (!gss->initial)</span><br><span style="color: hsl(0, 100%, 40%);">- return;</span><br><span style="color: hsl(0, 100%, 40%);">-</span><br><span style="color: hsl(0, 100%, 40%);">- remote = &gss->initial->saddr;</span><br><span style="color: hsl(120, 100%, 40%);">+ if (gss->role == GPRS_SNS_ROLE_BSS) {</span><br><span style="color: hsl(120, 100%, 40%);">+ if (!gss->initial)</span><br><span style="color: hsl(120, 100%, 40%);">+ return;</span><br><span style="color: hsl(120, 100%, 40%);">+ remote = &gss->initial->saddr;</span><br><span style="color: hsl(120, 100%, 40%);">+ } else</span><br><span style="color: hsl(120, 100%, 40%);">+ remote = gprs_ns2_ip_vc_remote(gss->sns_nsvc);</span><br><span> </span><br><span> /* count how many bindings are available (only UDP binds) */</span><br><span> count = llist_count(&gss->binds);</span><br><span>@@ -1526,6 +1536,7 @@</span><br><span> </span><br><span> fi->priv = gss;</span><br><span> gss->nse = nse;</span><br><span style="color: hsl(120, 100%, 40%);">+ gss->role = GPRS_SNS_ROLE_BSS;</span><br><span> INIT_LLIST_HEAD(&gss->sns_endpoints);</span><br><span> INIT_LLIST_HEAD(&gss->binds);</span><br><span> </span><br><span>@@ -1545,6 +1556,7 @@</span><br><span> struct gprs_ns2_nse *nse = nsvc->nse;</span><br><span> struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h;</span><br><span> uint16_t nsei = nsvc->nse->nsei;</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ns2_sns_state *gss;</span><br><span> struct osmo_fsm_inst *fi;</span><br><span> </span><br><span> if (!nse->bss_sns_fi) {</span><br><span>@@ -1555,6 +1567,9 @@</span><br><span> </span><br><span> /* FIXME: how to resolve SNS FSM Instance by NSEI (SGSN)? */</span><br><span> fi = nse->bss_sns_fi;</span><br><span style="color: hsl(120, 100%, 40%);">+ gss = (struct ns2_sns_state *) fi->priv;</span><br><span style="color: hsl(120, 100%, 40%);">+ if (!gss->sns_nsvc)</span><br><span style="color: hsl(120, 100%, 40%);">+ gss->sns_nsvc = nsvc;</span><br><span> </span><br><span> LOGPFSML(fi, LOGL_DEBUG, "NSEI=%u Rx SNS PDU type %s\n", nsei,</span><br><span> get_value_string(gprs_ns_pdu_strings, nsh->pdu_type));</span><br><span>@@ -1920,8 +1935,264 @@</span><br><span> /* TODO: implement weights after binds per sns implemented */</span><br><span> }</span><br><span> </span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+/***********************************************************************</span><br><span style="color: hsl(120, 100%, 40%);">+ * SGSN role</span><br><span style="color: hsl(120, 100%, 40%);">+ ***********************************************************************/</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+static void ns2_sns_st_sgsn_unconfigured(struct osmo_fsm_inst *fi, uint32_t event, void *data)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv;</span><br><span style="color: hsl(120, 100%, 40%);">+ OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN);</span><br><span style="color: hsl(120, 100%, 40%);">+ /* do nothing; Rx SNS-SIZE handled in ns2_sns_st_all_action_sgsn() */</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+/* We're waiting for inbound SNS-CONFIG from the BSS */</span><br><span style="color: hsl(120, 100%, 40%);">+static void ns2_sns_st_sgsn_wait_config(struct osmo_fsm_inst *fi, uint32_t event, void *data)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv;</span><br><span style="color: hsl(120, 100%, 40%);">+ struct gprs_ns2_nse *nse = nse_inst_from_fi(fi);</span><br><span style="color: hsl(120, 100%, 40%);">+ struct gprs_ns2_inst *nsi = nse->nsi;</span><br><span style="color: hsl(120, 100%, 40%);">+ uint8_t cause;</span><br><span style="color: hsl(120, 100%, 40%);">+ int rc;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN);</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ switch (event) {</span><br><span style="color: hsl(120, 100%, 40%);">+ case GPRS_SNS_EV_RX_CONFIG:</span><br><span style="color: hsl(120, 100%, 40%);">+ case GPRS_SNS_EV_RX_CONFIG_END:</span><br><span style="color: hsl(120, 100%, 40%);">+ rc = ns_sns_append_remote_eps(fi, data);</span><br><span style="color: hsl(120, 100%, 40%);">+ if (rc < 0) {</span><br><span style="color: hsl(120, 100%, 40%);">+ cause = -rc;</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_tx_sns_config_ack(gss->sns_nsvc, &cause);</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0);</span><br><span style="color: hsl(120, 100%, 40%);">+ return;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ /* only change state if last CONFIG was received */</span><br><span style="color: hsl(120, 100%, 40%);">+ if (event == GPRS_SNS_EV_RX_CONFIG_END) {</span><br><span style="color: hsl(120, 100%, 40%);">+ /* ensure sum of data weight / sig weights is > 0 */</span><br><span style="color: hsl(120, 100%, 40%);">+ if (nss_weight_sum_data(gss) == 0 || nss_weight_sum_sig(gss) == 0) {</span><br><span style="color: hsl(120, 100%, 40%);">+ cause = NS_CAUSE_INVAL_WEIGH;</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_tx_sns_config_ack(gss->sns_nsvc, &cause);</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_tx_sns_config_ack(gss->sns_nsvc, NULL);</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK, nsi->timeout[NS_TOUT_TSNS_PROV], 3);</span><br><span style="color: hsl(120, 100%, 40%);">+ } else {</span><br><span style="color: hsl(120, 100%, 40%);">+ /* just send CONFIG-ACK */</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_tx_sns_config_ack(gss->sns_nsvc, NULL);</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_timer_schedule(&fi->timer, nse->nsi->timeout[NS_TOUT_TSNS_PROV], 0);</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+static void ns2_sns_st_sgsn_wait_config_ack_onenter(struct osmo_fsm_inst *fi, uint32_t old_state)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv;</span><br><span style="color: hsl(120, 100%, 40%);">+ OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN);</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_sns_compute_local_ep_from_binds(fi);</span><br><span style="color: hsl(120, 100%, 40%);">+ /* transmit SGSN-oriented SNS-CONFIG */</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_tx_sns_config(gss->sns_nsvc, true, gss->ip4_local, gss->num_ip4_local,</span><br><span style="color: hsl(120, 100%, 40%);">+ gss->ip6_local, gss->num_ip6_local);</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+/* We're waiting for SNS-CONFIG-ACK from the BSS (in response to our outbound SNS-CONFIG) */</span><br><span style="color: hsl(120, 100%, 40%);">+static void ns2_sns_st_sgsn_wait_config_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv;</span><br><span style="color: hsl(120, 100%, 40%);">+ struct gprs_ns2_nse *nse = nse_inst_from_fi(fi);</span><br><span style="color: hsl(120, 100%, 40%);">+ struct tlv_parsed *tp = NULL;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN);</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ switch (event) {</span><br><span style="color: hsl(120, 100%, 40%);">+ case GPRS_SNS_EV_RX_CONFIG_ACK:</span><br><span style="color: hsl(120, 100%, 40%);">+ tp = data;</span><br><span style="color: hsl(120, 100%, 40%);">+ if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) {</span><br><span style="color: hsl(120, 100%, 40%);">+ LOGPFSML(fi, LOGL_ERROR, "Rx SNS-CONFIG-ACK with cause %s\n",</span><br><span style="color: hsl(120, 100%, 40%);">+ gprs_ns2_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE)));</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ /* we currently only send one SNS-CONFIG with END FLAG */</span><br><span style="color: hsl(120, 100%, 40%);">+ if (true) {</span><br><span style="color: hsl(120, 100%, 40%);">+ create_missing_nsvcs(fi);</span><br><span style="color: hsl(120, 100%, 40%);">+ /* start the test procedure on ALL NSVCs! */</span><br><span style="color: hsl(120, 100%, 40%);">+ gprs_ns2_start_alive_all_nsvcs(nse);</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIGURED, ns_sns_configured_timeout(fi), 4);</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+/* SGSN-side SNS state machine */</span><br><span style="color: hsl(120, 100%, 40%);">+static const struct osmo_fsm_state ns2_sns_sgsn_states[] = {</span><br><span style="color: hsl(120, 100%, 40%);">+ [GPRS_SNS_ST_UNCONFIGURED] = {</span><br><span style="color: hsl(120, 100%, 40%);">+ .in_event_mask = 0, /* handled by all_state_action */</span><br><span style="color: hsl(120, 100%, 40%);">+ .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_ST_SGSN_WAIT_CONFIG),</span><br><span style="color: hsl(120, 100%, 40%);">+ .name = "UNCONFIGURED",</span><br><span style="color: hsl(120, 100%, 40%);">+ .action = ns2_sns_st_sgsn_unconfigured,</span><br><span style="color: hsl(120, 100%, 40%);">+ },</span><br><span style="color: hsl(120, 100%, 40%);">+ [GPRS_SNS_ST_SGSN_WAIT_CONFIG] = {</span><br><span style="color: hsl(120, 100%, 40%);">+ .in_event_mask = S(GPRS_SNS_EV_RX_CONFIG) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_EV_RX_CONFIG_END),</span><br><span style="color: hsl(120, 100%, 40%);">+ .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_ST_SGSN_WAIT_CONFIG) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK),</span><br><span style="color: hsl(120, 100%, 40%);">+ .name = "SGSN_WAIT_CONFIG",</span><br><span style="color: hsl(120, 100%, 40%);">+ .action = ns2_sns_st_sgsn_wait_config,</span><br><span style="color: hsl(120, 100%, 40%);">+ //.onenter = ns2_sns_st_sgsn_wait_config_onenter,</span><br><span style="color: hsl(120, 100%, 40%);">+ },</span><br><span style="color: hsl(120, 100%, 40%);">+ [GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK] = {</span><br><span style="color: hsl(120, 100%, 40%);">+ .in_event_mask = S(GPRS_SNS_EV_RX_CONFIG_ACK),</span><br><span style="color: hsl(120, 100%, 40%);">+ .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_ST_CONFIGURED),</span><br><span style="color: hsl(120, 100%, 40%);">+ .name = "SGSN_WAIT_CONFIG_ACK",</span><br><span style="color: hsl(120, 100%, 40%);">+ .action = ns2_sns_st_sgsn_wait_config_ack,</span><br><span style="color: hsl(120, 100%, 40%);">+ .onenter = ns2_sns_st_sgsn_wait_config_ack_onenter,</span><br><span style="color: hsl(120, 100%, 40%);">+ },</span><br><span style="color: hsl(120, 100%, 40%);">+ [GPRS_SNS_ST_CONFIGURED] = {</span><br><span style="color: hsl(120, 100%, 40%);">+ .in_event_mask = S(GPRS_SNS_EV_RX_ADD) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_EV_RX_DELETE) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_EV_RX_CHANGE_WEIGHT) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_EV_REQ_NSVC_ALIVE),</span><br><span style="color: hsl(120, 100%, 40%);">+ .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED),</span><br><span style="color: hsl(120, 100%, 40%);">+ .name = "CONFIGURED",</span><br><span style="color: hsl(120, 100%, 40%);">+ /* shared with BSS side; once configured there's no difference */</span><br><span style="color: hsl(120, 100%, 40%);">+ .action = ns2_sns_st_configured,</span><br><span style="color: hsl(120, 100%, 40%);">+ .onenter = ns2_sns_st_configured_onenter,</span><br><span style="color: hsl(120, 100%, 40%);">+ },</span><br><span style="color: hsl(120, 100%, 40%);">+};</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+static int ns2_sns_fsm_sgsn_timer_cb(struct osmo_fsm_inst *fi)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv;</span><br><span style="color: hsl(120, 100%, 40%);">+ struct gprs_ns2_nse *nse = nse_inst_from_fi(fi);</span><br><span style="color: hsl(120, 100%, 40%);">+ struct gprs_ns2_inst *nsi = nse->nsi;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ gss->N++;</span><br><span style="color: hsl(120, 100%, 40%);">+ switch (fi->T) {</span><br><span style="color: hsl(120, 100%, 40%);">+ case 3:</span><br><span style="color: hsl(120, 100%, 40%);">+ if (gss->N >= nsi->timeout[NS_TOUT_TSNS_CONFIG_RETRIES]) {</span><br><span style="color: hsl(120, 100%, 40%);">+ LOGPFSML(fi, LOGL_ERROR, "NSE %d: SGSN Config retries failed. Giving up.\n", nse->nsei);</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, nsi->timeout[NS_TOUT_TSNS_PROV], 3);</span><br><span style="color: hsl(120, 100%, 40%);">+ } else {</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK, nsi->timeout[NS_TOUT_TSNS_PROV], 3);</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ case 4:</span><br><span style="color: hsl(120, 100%, 40%);">+ LOGPFSML(fi, LOGL_ERROR, "NSE %d: Config succeeded but no NS-VC came online.\n", nse->nsei);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ return 0;</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+/* allstate-action for SGSN role */</span><br><span style="color: hsl(120, 100%, 40%);">+static void ns2_sns_st_all_action_sgsn(struct osmo_fsm_inst *fi, uint32_t event, void *data)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv;</span><br><span style="color: hsl(120, 100%, 40%);">+ struct tlv_parsed *tp = NULL;</span><br><span style="color: hsl(120, 100%, 40%);">+ uint8_t flag;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN);</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ switch (event) {</span><br><span style="color: hsl(120, 100%, 40%);">+ case GPRS_SNS_EV_RX_SIZE:</span><br><span style="color: hsl(120, 100%, 40%);">+ tp = (struct tlv_parsed *) data;</span><br><span style="color: hsl(120, 100%, 40%);">+ if (!TLVP_PRES_LEN(tp, NS_IE_RESET_FLAG, 1)) {</span><br><span style="color: hsl(120, 100%, 40%);">+ uint8_t cause = NS_CAUSE_MISSING_ESSENT_IE;</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_tx_sns_size_ack(gss->sns_nsvc, &cause);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ flag = *TLVP_VAL(tp, NS_IE_RESET_FLAG);</span><br><span style="color: hsl(120, 100%, 40%);">+ if (flag & 1) {</span><br><span style="color: hsl(120, 100%, 40%);">+ struct gprs_ns2_vc *nsvc, *nsvc2;</span><br><span style="color: hsl(120, 100%, 40%);">+ /* clear all state */</span><br><span style="color: hsl(120, 100%, 40%);">+ gss->N = 0;</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_clear_ipv46_entries(gss);</span><br><span style="color: hsl(120, 100%, 40%);">+ llist_for_each_entry_safe(nsvc, nsvc2, &gss->nse->nsvc, list) {</span><br><span style="color: hsl(120, 100%, 40%);">+ if (nsvc == gss->sns_nsvc) {</span><br><span style="color: hsl(120, 100%, 40%);">+ /* keep the NSVC we need for SNS, but unconfigure it */</span><br><span style="color: hsl(120, 100%, 40%);">+ nsvc->sig_weight = 0;</span><br><span style="color: hsl(120, 100%, 40%);">+ nsvc->data_weight = 0;</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_vc_force_unconfigured(nsvc);</span><br><span style="color: hsl(120, 100%, 40%);">+ } else {</span><br><span style="color: hsl(120, 100%, 40%);">+ /* free all other NS-VCs */</span><br><span style="color: hsl(120, 100%, 40%);">+ gprs_ns2_free_nsvc(nsvc);</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ /* send SIZE_ACK */</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_tx_sns_size_ack(gss->sns_nsvc, NULL);</span><br><span style="color: hsl(120, 100%, 40%);">+ /* only wait for SNS-CONFIG in case of Reset flag */</span><br><span style="color: hsl(120, 100%, 40%);">+ if (flag & 1)</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SGSN_WAIT_CONFIG, 0, 0);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ default:</span><br><span style="color: hsl(120, 100%, 40%);">+ ns2_sns_st_all_action(fi, event, data);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+static struct osmo_fsm gprs_ns2_sns_sgsn_fsm = {</span><br><span style="color: hsl(120, 100%, 40%);">+ .name = "GPRS-NS2-SNS-SGSN",</span><br><span style="color: hsl(120, 100%, 40%);">+ .states = ns2_sns_sgsn_states,</span><br><span style="color: hsl(120, 100%, 40%);">+ .num_states = ARRAY_SIZE(ns2_sns_sgsn_states),</span><br><span style="color: hsl(120, 100%, 40%);">+ .allstate_event_mask = S(GPRS_SNS_EV_RX_SIZE) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_EV_REQ_NO_NSVC) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_EV_REQ_ADD_BIND) |</span><br><span style="color: hsl(120, 100%, 40%);">+ S(GPRS_SNS_EV_REQ_DELETE_BIND),</span><br><span style="color: hsl(120, 100%, 40%);">+ .allstate_action = ns2_sns_st_all_action_sgsn,</span><br><span style="color: hsl(120, 100%, 40%);">+ .cleanup = NULL,</span><br><span style="color: hsl(120, 100%, 40%);">+ .timer_cb = ns2_sns_fsm_sgsn_timer_cb,</span><br><span style="color: hsl(120, 100%, 40%);">+ .event_names = gprs_sns_event_names,</span><br><span style="color: hsl(120, 100%, 40%);">+ .pre_term = NULL,</span><br><span style="color: hsl(120, 100%, 40%);">+ .log_subsys = DLNS,</span><br><span style="color: hsl(120, 100%, 40%);">+};</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+/*! Allocate an IP-SNS FSM for the SGSN side.</span><br><span style="color: hsl(120, 100%, 40%);">+ * \param[in] nse NS Entity in which the FSM runs</span><br><span style="color: hsl(120, 100%, 40%);">+ * \param[in] id string identifier</span><br><span style="color: hsl(120, 100%, 40%);">+ * \returns FSM instance on success; NULL on error */</span><br><span style="color: hsl(120, 100%, 40%);">+struct osmo_fsm_inst *ns2_sns_sgsn_fsm_alloc(struct gprs_ns2_nse *nse, const char *id)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ struct osmo_fsm_inst *fi;</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ns2_sns_state *gss;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ fi = osmo_fsm_inst_alloc(&gprs_ns2_sns_sgsn_fsm, nse, NULL, LOGL_DEBUG, id);</span><br><span style="color: hsl(120, 100%, 40%);">+ if (!fi)</span><br><span style="color: hsl(120, 100%, 40%);">+ return fi;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ gss = talloc_zero(fi, struct ns2_sns_state);</span><br><span style="color: hsl(120, 100%, 40%);">+ if (!gss)</span><br><span style="color: hsl(120, 100%, 40%);">+ goto err;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ fi->priv = gss;</span><br><span style="color: hsl(120, 100%, 40%);">+ gss->nse = nse;</span><br><span style="color: hsl(120, 100%, 40%);">+ gss->role = GPRS_SNS_ROLE_SGSN;</span><br><span style="color: hsl(120, 100%, 40%);">+ INIT_LLIST_HEAD(&gss->sns_endpoints);</span><br><span style="color: hsl(120, 100%, 40%);">+ INIT_LLIST_HEAD(&gss->binds);</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ return fi;</span><br><span style="color: hsl(120, 100%, 40%);">+err:</span><br><span style="color: hsl(120, 100%, 40%);">+ osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL);</span><br><span style="color: hsl(120, 100%, 40%);">+ return NULL;</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span> /* initialize osmo_ctx on main tread */</span><br><span> static __attribute__((constructor)) void on_dso_load_ctx(void)</span><br><span> {</span><br><span> OSMO_ASSERT(osmo_fsm_register(&gprs_ns2_sns_bss_fsm) == 0);</span><br><span style="color: hsl(120, 100%, 40%);">+ OSMO_ASSERT(osmo_fsm_register(&gprs_ns2_sns_sgsn_fsm) == 0);</span><br><span> }</span><br><span></span><br></pre><p>To view, visit <a href="https://gerrit.osmocom.org/c/libosmocore/+/23405">change 23405</a>. 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<div style="display:none"> Gerrit-Project: libosmocore </div>
<div style="display:none"> Gerrit-Branch: master </div>
<div style="display:none"> Gerrit-Change-Id: I780413ffacd9cb71f64cc38057aae781eeb59b2b </div>
<div style="display:none"> Gerrit-Change-Number: 23405 </div>
<div style="display:none"> Gerrit-PatchSet: 1 </div>
<div style="display:none"> Gerrit-Owner: laforge <laforge@osmocom.org> </div>
<div style="display:none"> Gerrit-MessageType: newchange </div>