pespin has uploaded this change for review. (
https://gerrit.osmocom.org/c/libosmo-sigtran/+/40611?usp=email )
Change subject: vty: Introduce missing cmd 'point-code override opc'
......................................................................
vty: Introduce missing cmd 'point-code override opc'
This patch introduces several improvements and fixes around the
'point-code override' feature:
* properly split overriding OPC vs DPC over VTY: Before this patch only
DPC cmd was available despite being used for OPC under ASP role. Even
the VTY command had a description entry for OPC but it was not
implemented yet.
* Allow proper overriding with PC 0.
* Allow overriding of both OPC and DPC in SG role.
* Figure out role based on role VTY configuration instead of IPA
client/server config.
Related: OS#6806
Change-Id: Id8ba5252a088dafe85bb25e13298c585acef277d
---
M src/ipa.c
M src/ss7_as.h
M src/ss7_as_vty.c
M tests/vty/osmo_stp_test.vty
4 files changed, 107 insertions(+), 30 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmo-sigtran
refs/changes/11/40611/1
diff --git a/src/ipa.c b/src/ipa.c
index 58646fa..8afe91b 100644
--- a/src/ipa.c
+++ b/src/ipa.c
@@ -265,25 +265,40 @@
* information inside the non-CR/CC connection oriented
* messages.
*
- * The only other alternative we have is to simply have a
- * STP (server) side configuration that specifies which point
- * code those messages are to be routed to, and then use this
- * 'override DPC' in the routing decision. We could do the same
- * for the source point code to ensure responses are routed back
- * to us. This is all quite ugly, but then what can we do :/
+ * The only other alternative we have is to:
+ *
+ * ASP role: we assume whatever was received at the ASP/AS was meant to
+ * reach us and hence set the DPC to he PC configured in the
+ * 'routing-key'. In this case the 'override OPC' is used so that upper
+ * layers can find out where it came from, so it can answer back if
needed.
+ *
+ * SG role (STP): By default, the AS associated with the ASP assumes the
+ * OPC of the message received was transmitted to us from the PC
+ * configured in the 'routing-key'. If set, 'override OPC' can be used
+ * to also tweak the originating PC, which can be useful in setups with
+ * traffic coming from another STP where want to set eg. the OPC to the
+ * PC of the originating AS. In this case the 'override DPC'.
+ * allows to find out where those messages are to be routed to in the
+ * routing decision.
+ *
+ * This is all quite ugly, but then what can we do :/
*/
/* First, determine the DPC and OPC to use */
- if (asp->cfg.is_server) {
- /* Source: the PC of the routing key */
- opc = as->cfg.routing_key.pc;
- /* Destination: Based on VTY config */
- dpc = as->cfg.pc_override.dpc;
- } else {
+ if (asp->cfg.role == OSMO_SS7_ASP_ROLE_ASP) {
/* Source: Based on VTY config */
- opc = as->cfg.pc_override.dpc;
+ opc = as->cfg.pc_override.opc;
/* Destination: PC of the routing key */
dpc = as->cfg.routing_key.pc;
+ } else {
+ /* Source: if set, based on VTY config,
+ * otherwise by default the PC of the routing key */
+ if (as->cfg.pc_override.opc_enabled)
+ opc = as->cfg.pc_override.opc;
+ else
+ opc = as->cfg.routing_key.pc;
+ /* Destination: Based on VTY config */
+ dpc = as->cfg.pc_override.dpc;
}
/* Second, patch this into the SCCP message */
diff --git a/src/ss7_as.h b/src/ss7_as.h
index be10f48..98151f8 100644
--- a/src/ss7_as.h
+++ b/src/ss7_as.h
@@ -104,6 +104,9 @@
uint32_t recovery_timeout_msec;
uint8_t qos_class;
struct {
+ bool opc_enabled;
+ bool dpc_enabled;
+ uint32_t opc;
uint32_t dpc;
enum osmo_ss7_as_patch_sccp_mode sccp_mode;
} pc_override;
diff --git a/src/ss7_as_vty.c b/src/ss7_as_vty.c
index e94e0c2..6ce57d4 100644
--- a/src/ss7_as_vty.c
+++ b/src/ss7_as_vty.c
@@ -344,18 +344,19 @@
}
DEFUN_ATTR(as_pc_override, as_pc_override_cmd,
- "point-code override dpc PC",
+ "point-code override (opc|dpc) PC",
"Point Code Specific Features\n"
- "Override (force) a point-code to hard-coded value\n"
- "Override Source Point Code\n"
- "Override Destination Point Code\n"
+ "Override (force) a point-code of messages received at the AS\n"
+ "Override Source Point Code of received messages\n"
+ "Override Destination Point Code of received messages\n"
"New Point Code\n",
CMD_ATTR_IMMEDIATE)
{
struct osmo_ss7_as *as = vty->index;
- int pc = osmo_ss7_pointcode_parse(as->inst, argv[0]);
+ bool change_dpc = !strcmp(argv[0], "dpc");
+ int pc = osmo_ss7_pointcode_parse(as->inst, argv[1]);
if (pc < 0) {
- vty_out(vty, "Invalid point code (%s)%s", argv[0], VTY_NEWLINE);
+ vty_out(vty, "Invalid point code (%s)%s", argv[1], VTY_NEWLINE);
return CMD_WARNING;
}
@@ -365,11 +366,48 @@
return CMD_WARNING;
}
- as->cfg.pc_override.dpc = pc;
+ if (change_dpc) {
+ if (cs7_role == CS7_ROLE_ASP) {
+ vty_out(vty, "%% Overriding the DPC of AS '%s' in role
ASP makes no sense. "
+ "Assuming user meant 'point-code override opc
%s' to stay backway-comaptible. "
+ "Please update your config!%s",
+ as->cfg.name, argv[1], VTY_NEWLINE);
+ as->cfg.pc_override.opc_enabled = true;
+ as->cfg.pc_override.opc = pc;
+ return CMD_SUCCESS;
+ }
+ as->cfg.pc_override.dpc_enabled = true;
+ as->cfg.pc_override.dpc = pc;
+ } else {
+ as->cfg.pc_override.opc_enabled = true;
+ as->cfg.pc_override.opc = pc;
+ }
return CMD_SUCCESS;
}
+DEFUN_ATTR(as_no_pc_override, as_no_pc_override_cmd,
+ "no point-code override (opc|dpc)",
+ NO_STR
+ "Point Code Specific Features\n"
+ "Override (force) a point-code of messages received at the AS\n"
+ "Override Source Point Code of received messages\n"
+ "Override Destination Point Code of received messages\n",
+ CMD_ATTR_IMMEDIATE)
+{
+ struct osmo_ss7_as *as = vty->index;
+ bool change_dpc = !strcmp(argv[0], "dpc");
+
+ if (change_dpc) {
+ as->cfg.pc_override.dpc_enabled = false;
+ as->cfg.pc_override.dpc = 0;
+ } else {
+ as->cfg.pc_override.opc_enabled = false;
+ as->cfg.pc_override.opc = 0;
+ }
+ return CMD_SUCCESS;
+}
+
DEFUN_ATTR(as_pc_patch_sccp, as_pc_patch_sccp_cmd,
"point-code override patch-sccp (disabled|both)",
"Point Code Specific Features\n"
@@ -450,7 +488,10 @@
vty_out(vty, " ssn %u", rkey->ssn);
vty_out(vty, "%s", VTY_NEWLINE);
- if (as->cfg.pc_override.dpc)
+ if (as->cfg.pc_override.opc_enabled)
+ vty_out(vty, " point-code override opc %s%s",
+ osmo_ss7_pointcode_print(as->inst,
as->cfg.pc_override.opc), VTY_NEWLINE);
+ if (as->cfg.pc_override.dpc_enabled)
vty_out(vty, " point-code override dpc %s%s",
osmo_ss7_pointcode_print(as->inst,
as->cfg.pc_override.dpc), VTY_NEWLINE);
@@ -584,15 +625,30 @@
/* Config sanity checks: */
- /* AS in ASP role should be configured with a local PC which they can
- * then announce using RKM.
- * Still, allow STPs to have AS(P) configured in an ASP mode to talk to
a
- * peer STP by announcing remove PCs. */
- if (cs7_role == CS7_ROLE_ASP &&
- ss7_as_get_local_role(as) == OSMO_SS7_ASP_ROLE_ASP &&
- !osmo_ss7_pc_is_local(as->inst, as->cfg.routing_key.pc))
- vty_out(vty, "%% AS with local role ASP should have a local PC
configured in its routing-key. Fix your config!%s", VTY_NEWLINE);
+ if (cs7_role == CS7_ROLE_ASP) {
+ int as_role = ss7_as_get_local_role(as);
+ /* AS in ASP role should be configured with a local PC which
they can
+ * then announce using RKM.
+ * Still, allow STPs to have AS(P) configured in an ASP mode to
talk to a
+ * peer STP by announcing remove PCs. */
+ if (as_role == OSMO_SS7_ASP_ROLE_ASP &&
+ !osmo_ss7_pc_is_local(as->inst, as->cfg.routing_key.pc))
+ vty_out(vty, "%% AS '%s' with local role ASP should
have a local PC configured in its "
+ "routing-key. Fix your config!%s",
as->cfg.name, VTY_NEWLINE);
+ if (as->cfg.proto == OSMO_SS7_ASP_PROT_IPA) {
+ if (as_role == OSMO_SS7_ASP_ROLE_ASP &&
+ !as->cfg.pc_override.opc_enabled)
+ vty_out(vty, "%% ipa AS '%s' with local role
ASP should have a "
+ "'point-code override opc PC'
configured in its routing-key. Fix your config!%s",
+ as->cfg.name, VTY_NEWLINE);
+ if (as_role == OSMO_SS7_ASP_ROLE_SG &&
+ !as->cfg.pc_override.dpc_enabled)
+ vty_out(vty, "%% ipa AS '%s' with local role SG
should have a "
+ "'point-code override dpc PC'
configured in its routing-key. Fix your config!%s",
+ as->cfg.name, VTY_NEWLINE);
+ }
+ }
return 0;
}
@@ -619,5 +675,6 @@
install_lib_element(L_CS7_AS_NODE, &as_rout_key_ssn_cmd);
install_lib_element(L_CS7_AS_NODE, &as_rout_key_si_ssn_cmd);
install_lib_element(L_CS7_AS_NODE, &as_pc_override_cmd);
+ install_lib_element(L_CS7_AS_NODE, &as_no_pc_override_cmd);
install_lib_element(L_CS7_AS_NODE, &as_pc_patch_sccp_cmd);
}
diff --git a/tests/vty/osmo_stp_test.vty b/tests/vty/osmo_stp_test.vty
index 4502c74..a253c5a 100644
--- a/tests/vty/osmo_stp_test.vty
+++ b/tests/vty/osmo_stp_test.vty
@@ -387,7 +387,8 @@
routing-key RCONTEXT DPC si (aal2|bicc|b-isup|h248|isup|sat-isup|sccp|tup)
routing-key RCONTEXT DPC ssn SSN
routing-key RCONTEXT DPC si (aal2|bicc|b-isup|h248|isup|sat-isup|sccp|tup)
ssn SSN
- point-code override dpc PC
+ point-code override (opc|dpc) PC
+ no point-code override (opc|dpc)
point-code override patch-sccp (disabled|both)
OsmoSTP(config-cs7-as)# ?
@@ -406,6 +407,7 @@
OsmoSTP(config-cs7-as)# no ?
asp Specify ASP to be removed from this AS
traffic-mode Remove explicit traffic mode of operation of this AS
+ point-code Point Code Specific Features
OsmoSTP(config-cs7-as)# do show cs7 instance 0 as all
Routing Routing Key Cic
Cic Traffic
--
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Gerrit-MessageType: newchange
Gerrit-Project: libosmo-sigtran
Gerrit-Branch: master
Gerrit-Change-Id: Id8ba5252a088dafe85bb25e13298c585acef277d
Gerrit-Change-Number: 40611
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pes...@sysmocom.de>
