mpls_return_enum ldp_fec_process_change(ldp_global * g, ldp_fec * f,
ldp_nexthop *nh, ldp_nexthop *nh_old, ldp_session *nh_session_old) {
ldp_session *peer = NULL;
ldp_attr *us_attr = NULL;
ldp_attr *ds_attr = NULL;
ldp_session *nh_session = NULL;
LDP_ENTER(g->user_data, "ldp_fec_process_change");
if (!nh_session_old) {
nh_session_old = ldp_session_for_nexthop(nh_old);
}
/*
* NH 1-5 decide if we need to release an existing mapping
*/
ds_attr = ldp_attr_find_downstream_state2(g, nh_session_old, f,
LDP_LSP_STATE_MAP_RECV);
if (!ds_attr) { /* NH.1 */
goto Detect_Change_Fec_Next_Hop_6;
}
if (ds_attr->ingress == MPLS_BOOL_TRUE) {
#if MPLS_USE_LSR
lsr_ftn ftn;
ftn.outsegment_index = ds_attr->outlabel->info.handle;
memcpy(&ftn.fec, &f->info, sizeof(mpls_fec));
lsr_cfg_ftn_set2(g->lsr_handle, &ftn, LSR_CFG_DEL);
#else
mpls_mpls_fec2out_del(g->mpls_handle, &f->info, &ds_attr->outlabel->info);
#endif
ds_attr->ingress = MPLS_BOOL_FALSE;
ds_attr->outlabel->merge_count--;
}
if (g->label_retention_mode == LDP_RETENTION_LIBERAL) { /* NH.3 */
ldp_attr *us_temp;
us_attr = MPLS_LIST_HEAD(&ds_attr->us_attr_root);
while (us_attr) {
/* need to walk the list in such a way as not to
* "pull the rug out from under me self"
*/
us_temp = MPLS_LIST_NEXT(&ds_attr->us_attr_root, us_attr, _ds_attr);
if (us_attr->state == LDP_LSP_STATE_MAP_SENT) {
ldp_inlabel_del_outlabel(g, us_attr->inlabel); /* NH.2 */
ldp_attr_del_us2ds(us_attr, ds_attr);
}
us_attr = us_temp;
}
goto Detect_Change_Fec_Next_Hop_6;
}
ldp_label_release_send(g, nh_session_old, ds_attr, LDP_NOTIF_NONE); /* NH.4 */
ldp_attr_remove_complete(g, ds_attr, MPLS_BOOL_FALSE); /* NH.2,5 */
Detect_Change_Fec_Next_Hop_6:
/*
* NH 6-9 decides is we need to send a label request abort
*/
ds_attr = ldp_attr_find_downstream_state2(g, nh_session_old, f,
LDP_LSP_STATE_REQ_SENT);
if (ds_attr) { /* NH.6 */
if (g->label_retention_mode != LDP_RETENTION_CONSERVATIVE) { /* NH.7 */
/* NH.8,9 */
if (ldp_label_abort_send(g, nh_session_old, ds_attr) != MPLS_SUCCESS) {
return MPLS_FAILURE;
}
}
}
/*
* NH 10-12 decides if we can use a mapping from our database
*/
if (!(nh_session = ldp_get_next_hop_session_for_fec2(f,nh))){
goto Detect_Change_Fec_Next_Hop_16;
}
ds_attr = ldp_attr_find_downstream_state2(g, nh_session, f,
LDP_LSP_STATE_MAP_RECV);
if (!ds_attr) { /* NH.11 */
goto Detect_Change_Fec_Next_Hop_13;
}
if (ldp_label_mapping_process(g, nh_session, NULL, NULL, ds_attr, f) !=
MPLS_SUCCESS) { /* NH.12 */
return MPLS_FAILURE;
}
goto Detect_Change_Fec_Next_Hop_20;
Detect_Change_Fec_Next_Hop_13:
/*
* NH 13-15 decides if we need to make a label request
*/
if (nh_session->oper_distribution_mode == LDP_DISTRIBUTION_ONDEMAND &&
g->label_retention_mode == LDP_RETENTION_CONSERVATIVE) {
/* NH.14-15 */
if (ldp_label_request_for_xc(g, nh_session, &f->info, NULL, &ds_attr) !=
MPLS_SUCCESS) {
return MPLS_FAILURE;
}
}
goto Detect_Change_Fec_Next_Hop_20;
Detect_Change_Fec_Next_Hop_16:
peer = MPLS_LIST_HEAD(&g->session);
while (peer) {
if (peer->state == LDP_STATE_OPERATIONAL) {
us_attr = ldp_attr_find_upstream_state2(g, peer, f,
LDP_LSP_STATE_MAP_SENT);
if (us_attr) { /* NH.17 */
if (ldp_label_withdraw_send(g, peer, us_attr, LDP_NOTIF_NONE) !=
MPLS_SUCCESS) { /* NH.18 */
ldp_attr_remove_complete(g, us_attr, MPLS_BOOL_FALSE);
return MPLS_FAILURE;
}
}
}
peer = MPLS_LIST_NEXT(&g->session, peer, _global);
}
Detect_Change_Fec_Next_Hop_20:
LDP_EXIT(g->user_data, "ldp_fec_process_change");
return MPLS_SUCCESS;
}
void ldp_attr_remove_complete(ldp_global * g, ldp_attr * attr,
mpls_bool complete)
{
ldp_session *session = attr->session;
ldp_outlabel *out = NULL;
ldp_inlabel *in = NULL;
ldp_attr *us_temp = NULL;
mpls_fec fec;
int i;
switch (attr->state) {
case LDP_LSP_STATE_MAP_RECV:
if (attr->ingress == MPLS_BOOL_TRUE) {
out = attr->outlabel;
MPLS_ASSERT(out != NULL);
while ((in = MPLS_LIST_HEAD(&out->inlabel_root)) != NULL) {
ldp_inlabel_del_outlabel(g, in);
}
if (out->merge_count > 0) {
for (i = 0; i < attr->fecTlv.numberFecElements; i++) {
fec_tlv2mpls_fec(&attr->fecTlv, i, &fec);
out->merge_count--;
#if MPLS_USE_LSR
{
lsr_ftn ftn;
memcpy(&ftn.fec, &fec, sizeof(mpls_fec));
ftn.outsegment_index = out->info.handle;
lsr_cfg_ftn_set2(g->lsr_handle, &ftn, LSR_CFG_DEL);
}
#else
mpls_mpls_fec2out_del(g->mpls_handle, &fec, &out->info);
#endif
}
}
MPLS_ASSERT(out->merge_count == 0);
ldp_attr_del_outlabel(g, attr);
ldp_session_del_outlabel(g, session, out);
}
while ((us_temp = MPLS_LIST_HEAD(&attr->us_attr_root)) != NULL) {
ldp_attr_del_us2ds(g, us_temp, attr);
}
ldp_attr_delete_downstream(g, session, attr);
break;
case LDP_LSP_STATE_MAP_SENT:
in = attr->inlabel;
out = in->outlabel;
if (in->reuse_count == 1 && out) {
ldp_inlabel_del_outlabel(g, in);
}
ldp_attr_del_inlabel(g, attr);
ldp_attr_delete_upstream(g, session, attr);
ldp_attr_del_us2ds(g, attr, attr->ds_attr);
ldp_session_del_inlabel(g, session, in);
break;
case LDP_LSP_STATE_ABORT_SENT:
case LDP_LSP_STATE_NOTIF_SENT:
case LDP_LSP_STATE_REQ_RECV:
case LDP_LSP_STATE_WITH_SENT:
case LDP_LSP_STATE_NO_LABEL_RESOURCE_SENT:
{
ldp_attr_del_us2ds(g, attr, attr->ds_attr);
ldp_attr_delete_upstream(g, session, attr);
break;
}
case LDP_LSP_STATE_ABORT_RECV:
case LDP_LSP_STATE_NOTIF_RECV:
case LDP_LSP_STATE_REQ_SENT:
case LDP_LSP_STATE_WITH_RECV:
case LDP_LSP_STATE_NO_LABEL_RESOURCE_RECV:
{
while ((us_temp = MPLS_LIST_HEAD(&attr->us_attr_root)) != NULL) {
ldp_attr_del_us2ds(g, us_temp, attr);
}
ldp_attr_delete_downstream(g, session, attr);
break;
}
}
}