pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/libosmo-sigtran/+/42100?usp=email )

Change subject: xua: Allow rx DAUD in IPSP with quirk daud_in_asp ......................................................................

xua: Allow rx DAUD in IPSP with quirk daud_in_asp

That quirk was added back in time most probably when interacting with some peer who claimed to be in SG mode but actually was in IPSP mode. Hence, to be on the safe side, be relaxed and allow accepting DAUD also if the quirk is added, otherwise it may be impossible to continue communication with that faulty peer. In theory according to spec DAUD should only be sent ASP->SG.

Change-Id: I8ad0889f4584446f8b01f1255498f57e0cd34012 --- M src/m3ua.c M src/sua.c 2 files changed, 26 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-sigtran refs/changes/00/42100/1

diff --git a/src/m3ua.c b/src/m3ua.c index abf951f..a2da98e 100644 --- a/src/m3ua.c +++ b/src/m3ua.c @@ -1127,9 +1127,21 @@ return rc; xua_snm_rx_scon(asp, as, xua); break; + case M3UA_SNM_DAUD: + /* RFC states only permitted in ASP->SG direction, not reverse nor IPSP. But some + * equipment still sends it to us as IPSP ?!? */ + if (asp->cfg.quirks & OSMO_SS7_ASP_QUIRK_DAUD_IN_ASP) { + LOGPASP(asp, DLM3UA, LOGL_NOTICE, "quirk daud_in_asp active: Accepting DAUD " + "despite being in IPSP role\n"); + xua_snm_rx_daud(asp, xua); + } else { + LOGPASP(asp, DLM3UA, LOGL_ERROR, "DAUD not permitted in IPSP role\n"); + rc = M3UA_ERR_UNSUPP_MSG_TYPE; + } + break; default: /* RFC 4666 Section 1.5.2: there is no MTP3 network management status information */ - return M3UA_ERR_UNSUPP_MSG_TYPE; + rc = M3UA_ERR_UNSUPP_MSG_TYPE; }

return rc; diff --git a/src/sua.c b/src/sua.c index 2eb93e3..f836a9a 100644 --- a/src/sua.c +++ b/src/sua.c @@ -1085,8 +1085,20 @@ return rc; xua_snm_rx_scon(asp, as, xua); break; + case SUA_SNM_DAUD: + /* RFC states only permitted in ASP->SG direction, not reverse nor IPSP. But some + * equipment still sends it to us as IPSP ?!? */ + if (asp->cfg.quirks & OSMO_SS7_ASP_QUIRK_DAUD_IN_ASP) { + LOGPASP(asp, DLSUA, LOGL_NOTICE, "quirk daud_in_asp active: Accepting DAUD " + "despite being in IPSP role\n"); + xua_snm_rx_daud(asp, xua); + } else { + LOGPASP(asp, DLSUA, LOGL_ERROR, "DAUD not permitted in IPSP role\n"); + rc = SUA_ERR_UNSUPP_MSG_TYPE; + } + break; default: - return M3UA_ERR_UNSUPP_MSG_TYPE; + rc = M3UA_ERR_UNSUPP_MSG_TYPE; }

return rc;