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Simplify up_session_choose_f_teid() with early returns

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Change-Id: I6e8c64d093588157c86bb3acaaeed458ff73132d
This commit is contained in:
Pau Espin Pedrol
2025-01-31 16:15:45 +01:00
parent 63c98c38f1
commit d4a4f0ce63
1 changed files with 36 additions and 33 deletions
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69
src/osmo-upf/up_session.c
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@@ -185,43 +185,46 @@ static enum osmo_pfcp_cause up_session_choose_f_teid(struct up_session *session,
bool choose_id_present, uint8_t choose_id,
const char *netinst_name)
{
struct chosen_f_teid *chosen = NULL;
struct chosen_f_teid *chosen;
int rc;
if (choose_id_present)
if (choose_id_present) {
chosen = chosen_f_teid_find(&session->chosen_f_teids, choose_id);
if (chosen) {
/* Re-use a previous F-TEID */
*dst = chosen->f_teid;
} else {
int rc;
if (chosen) {
/* Re-use a previous F-TEID */
*dst = chosen->f_teid;
return OSMO_PFCP_CAUSE_REQUEST_ACCEPTED;
}
/* No previous F-TEID found, allocate a new one below */
}
*dst = (struct osmo_pfcp_ie_f_teid){
.choose_flag = false,
*dst = (struct osmo_pfcp_ie_f_teid){
.choose_flag = false,
};
/* Determine local IP address from Network Instance value received in PFCP request */
rc = up_session_choose_local_ip(session, &dst->fixed.ip_addr, netinst_name);
if (rc)
return rc;
/* Choose a new TEID */
dst->fixed.teid = upf_next_local_teid();
if (dst->fixed.teid == 0) {
LOGPFSML(session->fi, LOGL_ERROR, "Failed to allocate an unused TEID\n");
return OSMO_PFCP_CAUSE_PFCP_ENTITY_IN_CONGESTION;
}
LOGPFSML(session->fi, LOGL_INFO, "Allocated new local F-TEID %s\n",
osmo_pfcp_ie_f_teid_to_str_c(OTC_SELECT, dst));
/* Save this choice */
if (choose_id_present) {
chosen = talloc(session, struct chosen_f_teid);
*chosen = (struct chosen_f_teid){
.f_teid = *dst,
.choose_id = choose_id,
};
/* Determine local IP address from Network Instance value received in PFCP request */
rc = up_session_choose_local_ip(session, &dst->fixed.ip_addr, netinst_name);
if (rc)
return rc;
/* Choose a new TEID */
dst->fixed.teid = upf_next_local_teid();
if (dst->fixed.teid == 0) {
LOGPFSML(session->fi, LOGL_ERROR, "Failed to allocate an unused TEID\n");
return OSMO_PFCP_CAUSE_PFCP_ENTITY_IN_CONGESTION;
}
LOGPFSML(session->fi, LOGL_INFO, "Allocated new local F-TEID %s\n",
osmo_pfcp_ie_f_teid_to_str_c(OTC_SELECT, dst));
/* Save this choice */
if (choose_id_present) {
chosen = talloc(session, struct chosen_f_teid);
*chosen = (struct chosen_f_teid){
.f_teid = *dst,
.choose_id = choose_id,
};
llist_add_tail(&chosen->entry, &session->chosen_f_teids);
}
llist_add_tail(&chosen->entry, &session->chosen_f_teids);
}
return OSMO_PFCP_CAUSE_REQUEST_ACCEPTED;
}