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d28e2f7f49
When a PFCP control plane sends a Session Modification Request with Create FAR, Create QER, or Create URR IEs for IDs that were not previously created during PDR processing, the UPF rejects them with "Cannot find [FAR|QER|URR]-ID[N] in PDR" errors. This is because ogs_pfcp_handle_create_far/qer/urr() use ogs_pfcp_[far|qer|urr]_find() which only looks up existing entries, while ogs_pfcp_handle_create_pdr() correctly uses ogs_pfcp_pdr_find_or_add() which creates new entries if needed. In practice, some PFCP control planes (e.g., vendor-specific PGW-C implementations) send Create URR/QER/FAR in Session Modification without a corresponding Create PDR that would have pre-created these entries. The resulting PFCP error responses cascade into GTP-U Error Indications, causing bearer teardowns and IMS PDN disconnections. This patch: - Changes Create FAR/QER/URR handlers to use find_or_add, matching the existing Create PDR behavior - Makes Remove PDR/FAR/QER/URR handlers idempotent: removing a non-existent entry now returns success with a warning instead of failing with an error, since the desired state (entry removed) is already achieved Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> |
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