Change in libosmo-sccp[master]: m3ua/sua: Add new snm_inactive quirk

[laforge]

laforge has uploaded this change for review. ( https://gerrit.osmocom.org/c/libosmo-sccp/+/24216 )


Change subject: m3ua/sua: Add new snm_inactive quirk
......................................................................

m3ua/sua: Add new snm_inactive quirk

This quirk allows the M3UA + SUA code to accept SSNM/SNM traffic despite
being in AS-INACTIVE state.  This is forbidden by the RFCs but there
are some implementations that apparently just don't care what is
specified.

Change-Id: I193dd546b3e3c00e29f192d0d1bf7819b3e194be
Closes: OS#5148
---
M include/osmocom/sigtran/osmo_ss7.h
M src/m3ua.c
M src/osmo_ss7_vty.c
M src/sua.c
4 files changed, 10 insertions(+), 4 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/libosmo-sccp refs/changes/16/24216/1

diff --git a/include/osmocom/sigtran/osmo_ss7.h b/include/osmocom/sigtran/osmo_ss7.h
index a799b04..3d13b6a 100644
--- a/include/osmocom/sigtran/osmo_ss7.h
+++ b/include/osmocom/sigtran/osmo_ss7.h
@@ -432,9 +432,11 @@
 };
 
 /*! Peer SG doesn't send NTFY(AS-INACTIVE) after ASP-UP procedure */
-#define OSMO_SS7_ASP_QUIRK_NO_NOTIFY	0x00000001
+#define OSMO_SS7_ASP_QUIRK_NO_NOTIFY		0x00000001
 /*! Accept DAUD in ASP role (RFC states only permitted in ASP->SG role) */
-#define OSMO_SS7_ASP_QUIRK_DAUD_IN_ASP	0x00000002
+#define OSMO_SS7_ASP_QUIRK_DAUD_IN_ASP		0x00000002
+/*! Accept SSNM even if ASP is in AS-INACTIVE state */
+#define OSMO_SS7_ASP_QUIRK_SNM_INACTIVE		0x00000004
 
 int osmo_ss7_asp_peer_snprintf(char* buf, size_t buf_len, struct osmo_ss7_asp_peer *peer);
 int osmo_ss7_asp_peer_set_hosts(struct osmo_ss7_asp_peer *peer, void *talloc_ctx,
diff --git a/src/m3ua.c b/src/m3ua.c
index 283b3f8..f653d5b 100644
--- a/src/m3ua.c
+++ b/src/m3ua.c
@@ -933,7 +933,8 @@
 static int m3ua_rx_snm(struct osmo_ss7_asp *asp, struct xua_msg *xua)
 {
 	/* SNM only permitted in ACTIVE state */
-	if (asp->fi->state != XUA_ASP_S_ACTIVE) {
+	if (asp->fi->state != XUA_ASP_S_ACTIVE &&
+	    !(asp->fi->state == XUA_ASP_S_INACTIVE && asp->cfg.quirks & OSMO_SS7_ASP_QUIRK_SNM_INACTIVE)) {
 		LOGPASP(asp, DLM3UA, LOGL_NOTICE, "Received M3UA SNM while ASP in state %s\n",
 			osmo_fsm_inst_state_name(asp->fi));
 		return M3UA_ERR_UNEXPECTED_MSG;
diff --git a/src/osmo_ss7_vty.c b/src/osmo_ss7_vty.c
index b2e3192..dcbe9b2 100644
--- a/src/osmo_ss7_vty.c
+++ b/src/osmo_ss7_vty.c
@@ -58,12 +58,14 @@
 static const struct value_string asp_quirk_names[] = {
 	{ OSMO_SS7_ASP_QUIRK_NO_NOTIFY,		"no_notify" },
 	{ OSMO_SS7_ASP_QUIRK_DAUD_IN_ASP,	"daud_in_asp" },
+	{ OSMO_SS7_ASP_QUIRK_SNM_INACTIVE,	"snm_inactive" },
 	{ 0, NULL }
 };
 
 static const struct value_string asp_quirk_descs[] = {
 	{ OSMO_SS7_ASP_QUIRK_NO_NOTIFY, "Peer SG doesn't send NTFY(AS-INACTIVE) after ASP-UP" },
 	{ OSMO_SS7_ASP_QUIRK_DAUD_IN_ASP, "Allow Rx of DAUD in ASP role" },
+	{ OSMO_SS7_ASP_QUIRK_SNM_INACTIVE, "Allow Rx of [S]SNM in AS-INACTIVE state" },
 	{ 0, NULL }
 };
 
diff --git a/src/sua.c b/src/sua.c
index 4e9a2cb..27b75db 100644
--- a/src/sua.c
+++ b/src/sua.c
@@ -944,7 +944,8 @@
 static int sua_rx_snm(struct osmo_ss7_asp *asp, struct xua_msg *xua)
 {
 	/* SNM only permitted in ACTIVE state */
-	if (asp->fi->state != XUA_ASP_S_ACTIVE) {
+	if (asp->fi->state != XUA_ASP_S_ACTIVE &&
+	    !(asp->fi->state == XUA_ASP_S_INACTIVE && asp->cfg.quirks & OSMO_SS7_ASP_QUIRK_SNM_INACTIVE)) {
 		LOGPASP(asp, DLSUA, LOGL_NOTICE, "Received M3UA SNM while ASP in state %s\n",
 			osmo_fsm_inst_state_name(asp->fi));
 		return SUA_ERR_UNEXPECTED_MSG;

-- 
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Gerrit-Project: libosmo-sccp
Gerrit-Branch: master
Gerrit-Change-Id: I193dd546b3e3c00e29f192d0d1bf7819b3e194be
Gerrit-Change-Number: 24216
Gerrit-PatchSet: 1
Gerrit-Owner: laforge <laforge at osmocom.org>
Gerrit-MessageType: newchange
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