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send PDN error cause if needed (#352) 

* initial commit: respond with ESM Cause PDN-Type if we only allow IPv4 or IPv6 (not both)

* works as intended, removing debug statement.

* Fix the indentation and add the reference

Co-authored-by: Sukchan Lee <acetcom@gmail.com>
This commit is contained in:
Spencer Sevilla 2020-01-15 04:17:20 -08:00 committed by Sukchan Lee
parent 96af2d0337
commit 2abdef74cb
1 changed files with 28 additions and 0 deletions
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28
src/mme/esm-build.c
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@ -172,6 +172,34 @@ ogs_pkbuf_t *esm_build_activate_default_bearer_context_request(
return NULL;
}
/*
* In TS24.301 V15.6.0
* 6.5.1.3 UE requested PDN connectivity procedure accepted by the network
*
* If connectivity with the requested PDN is accepted,
* but with a restriction of IP version (i.e. both an IPv4 address and
* an IPv6 prefix is requested, but only one particular IP version, or
* only single IP version bearers are supported/allowed by the network),
* ESM cause #50 "PDN type IPv4 only allowed",
* #51 "PDN type IPv6 only allowed", or
* #52 "single address bearers only allowed", respectively, shall be
* included in the ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST message.
*/
if (sess->request_type.pdn_type ==
OGS_NAS_PDN_CONNECTIVITY_PDN_TYPE_IPV4V6) {
if (pdn_address->pdn_type == OGS_GTP_PDN_TYPE_IPV4) {
activate_default_eps_bearer_context_request->esm_cause =
ESM_CAUSE_PDN_TYPE_IPV4_ONLY_ALLOWED;
activate_default_eps_bearer_context_request->presencemask |=
OGS_NAS_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_REQUEST_ESM_CAUSE_PRESENT;
} else if (pdn_address->pdn_type == OGS_GTP_PDN_TYPE_IPV6) {
activate_default_eps_bearer_context_request->esm_cause =
ESM_CAUSE_PDN_TYPE_IPV6_ONLY_ALLOWED;
activate_default_eps_bearer_context_request->presencemask |=
OGS_NAS_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_REQUEST_ESM_CAUSE_PRESENT;
}
}
if (pdn->ambr.downlink || pdn->ambr.uplink) {
activate_default_eps_bearer_context_request->presencemask |=
OGS_NAS_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_REQUEST_APN_AMBR_PRESENT;