From 1035d90c1761d4ab94c998908a475a8dbc09b50c Mon Sep 17 00:00:00 2001 From: Neels Hofmeyr Date: Fri, 28 Dec 2018 21:22:32 +0100 Subject: fix vlr ops.subscr_assoc re-association In rare cases, a conn is already associated with a subscriber. So far, we abort()ed on that, bringing the entire osmo-msc down. Rather log an error and keep the service running. In vlr.ops.subscr_assoc, add success/failure return value, and abort the LU/PARQ on error. I haven't figured out in detail yet why/how a subscriber would re-launch a LU/PARQ on a conn that is already associated, so far it is merely clear that we do not want to crash the MSC if that happens. A log is in OS#3742. Related: OS#3742, OS#3743 Change-Id: Ic0d54644bc735700220b1ef3a4384c217d57d20f --- src/libmsc/gsm_04_08.c | 15 +++++++++++++-- src/libvlr/vlr_access_req_fsm.c | 16 ++++++++++------ src/libvlr/vlr_lu_fsm.c | 3 ++- 3 files changed, 25 insertions(+), 9 deletions(-) (limited to 'src') diff --git a/src/libmsc/gsm_04_08.c b/src/libmsc/gsm_04_08.c index b042baf71..81bda76ea 100644 --- a/src/libmsc/gsm_04_08.c +++ b/src/libmsc/gsm_04_08.c @@ -1764,12 +1764,22 @@ static void update_classmark(const struct gsm_classmark *src, struct gsm_classma } /* VLR informs us that the subscriber has been associated with a conn */ -static void msc_vlr_subscr_assoc(void *msc_conn_ref, +static int msc_vlr_subscr_assoc(void *msc_conn_ref, struct vlr_subscr *vsub) { struct ran_conn *conn = msc_conn_ref; OSMO_ASSERT(vsub); - OSMO_ASSERT(!conn->vsub); + if (conn->vsub) { + if (conn->vsub == vsub) + LOGPCONN(conn, LOGL_NOTICE, "msc_vlr_subscr_assoc(): conn already associated with %s\n", + vlr_subscr_name(vsub)); + else { + LOGPCONN(conn, LOGL_ERROR, "msc_vlr_subscr_assoc(): conn already associated with a subscriber," + " cannot associate with %s\n", vlr_subscr_name(vsub)); + return -EINVAL; + } + } + conn->vsub = vlr_subscr_get(vsub); OSMO_ASSERT(conn->vsub); conn->vsub->cs.attached_via_ran = conn->via_ran; @@ -1778,6 +1788,7 @@ static void msc_vlr_subscr_assoc(void *msc_conn_ref, * associated with the conn: merge the new Classmark into vsub->classmark. Don't overwrite valid * vsub->classmark with unset classmark, though. */ update_classmark(&conn->temporary_classmark, &conn->vsub->classmark); + return 0; } static int msc_vlr_route_gsup_msg(struct vlr_subscr *vsub, diff --git a/src/libvlr/vlr_access_req_fsm.c b/src/libvlr/vlr_access_req_fsm.c index 3a0760d84..3b4028524 100644 --- a/src/libvlr/vlr_access_req_fsm.c +++ b/src/libvlr/vlr_access_req_fsm.c @@ -72,7 +72,7 @@ struct proc_arq_priv { bool implicitly_accepted_parq_by_ciphering_cmd; }; -static void assoc_par_with_subscr(struct osmo_fsm_inst *fi, struct vlr_subscr *vsub) +static int assoc_par_with_subscr(struct osmo_fsm_inst *fi, struct vlr_subscr *vsub) { struct proc_arq_priv *par = fi->priv; struct vlr_instance *vlr = par->vlr; @@ -81,7 +81,7 @@ static void assoc_par_with_subscr(struct osmo_fsm_inst *fi, struct vlr_subscr *v par->vsub = vsub; /* Tell MSC to associate this subscriber with the given * connection */ - vlr->ops.subscr_assoc(par->msc_conn_ref, par->vsub); + return vlr->ops.subscr_assoc(par->msc_conn_ref, par->vsub); } static const char *vlr_proc_arq_result_name(const struct osmo_fsm_inst *fi) @@ -371,8 +371,10 @@ static void proc_arq_vlr_fn_init(struct osmo_fsm_inst *fi, GSM48_REJECT_NETWORK_FAILURE); } vsub->proc_arq_fsm = fi; - assoc_par_with_subscr(fi, vsub); - proc_arq_vlr_fn_post_imsi(fi); + if (assoc_par_with_subscr(fi, vsub) != 0) + proc_arq_fsm_done(fi, GSM48_REJECT_NETWORK_FAILURE); + else + proc_arq_vlr_fn_post_imsi(fi); vlr_subscr_put(vsub); return; } @@ -414,8 +416,10 @@ static void proc_arq_vlr_fn_w_obt_imsi(struct osmo_fsm_inst *fi, proc_arq_fsm_done(fi, GSM48_REJECT_IMSI_UNKNOWN_IN_VLR); return; } - assoc_par_with_subscr(fi, vsub); - proc_arq_vlr_fn_post_imsi(fi); + if (assoc_par_with_subscr(fi, vsub)) + proc_arq_fsm_done(fi, GSM48_REJECT_NETWORK_FAILURE); + else + proc_arq_vlr_fn_post_imsi(fi); vlr_subscr_put(vsub); } diff --git a/src/libvlr/vlr_lu_fsm.c b/src/libvlr/vlr_lu_fsm.c index e635305fa..b00f8cef0 100644 --- a/src/libvlr/vlr_lu_fsm.c +++ b/src/libvlr/vlr_lu_fsm.c @@ -954,7 +954,8 @@ static int assoc_lfp_with_sub(struct osmo_fsm_inst *fi, struct vlr_subscr *vsub) lfp->vsub = vsub; /* Tell MSC to associate this subscriber with the given * connection */ - vlr->ops.subscr_assoc(lfp->msc_conn_ref, lfp->vsub); + if (vlr->ops.subscr_assoc(lfp->msc_conn_ref, lfp->vsub)) + lu_fsm_failure(fi, GSM48_REJECT_NETWORK_FAILURE); return 0; } -- cgit v1.2.3