pimd: support originator id configuration

Allow user to specify the RP field for the SA messages.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

pimd/pim_cmd.c

@@ -7616,6 +7616,24 @@ DEFPY(msdp_peer_sa_limit, msdp_peer_sa_limit_cmd,
 	return nb_cli_apply_changes(vty, "%s", xpath);
 }
 
+DEFPY(msdp_originator_id, msdp_originator_id_cmd,
+      "[no] msdp originator-id ![A.B.C.D$originator_id]",
+      NO_STR
+      CFG_MSDP_STR
+      "Configure MSDP RP originator\n"
+      "MSDP RP originator identifier\n")
+{
+	char xpath_value[XPATH_MAXLEN];
+
+	snprintf(xpath_value, sizeof(xpath_value), "./msdp/originator-id");
+	if (no)
+		nb_cli_enqueue_change(vty, xpath_value, NB_OP_DESTROY, NULL);
+	else
+		nb_cli_enqueue_change(vty, xpath_value, NB_OP_MODIFY, originator_id_str);
+
+	return nb_cli_apply_changes(vty, NULL);
+}
+
 static void ip_msdp_show_mesh_group(struct vty *vty, struct pim_msdp_mg *mg,
 				    struct json_object *json)
 {
@@ -9012,6 +9030,7 @@ void pim_cmd_init(void)
 	install_element(PIM_NODE, &msdp_log_sa_changes_cmd);
 	install_element(PIM_NODE, &msdp_shutdown_cmd);
 	install_element(PIM_NODE, &msdp_peer_sa_limit_cmd);
+	install_element(PIM_NODE, &msdp_originator_id_cmd);
 
 	install_element(PIM_NODE, &pim_bsr_candidate_rp_cmd);
 	install_element(PIM_NODE, &pim_bsr_candidate_rp_group_cmd);

pimd/pim_msdp.c

@@ -44,6 +44,26 @@ static void pim_msdp_sa_deref(struct pim_msdp_sa *sa,
 static int pim_msdp_mg_mbr_comp(const void *p1, const void *p2);
 static void pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr);
 
+void pim_msdp_originator_id(struct pim_instance *pim, const struct prefix *group,
+			    struct in_addr *originator_id)
+{
+	struct rp_info *rp_info;
+
+	originator_id->s_addr = INADDR_ANY;
+
+	/* Originator ID was configured, use it. */
+	if (pim->msdp.originator_id.s_addr != INADDR_ANY) {
+		*originator_id = pim->msdp.originator_id;
+		return;
+	}
+
+	rp_info = pim_rp_find_match_group(pim, group);
+	if (rp_info) {
+		*originator_id = rp_info->rp.rpf_addr;
+		return;
+	}
+}
+
 /************************ SA cache management ******************************/
 /* RFC-3618:Sec-5.1 - global active source advertisement timer */
 static void pim_msdp_sa_adv_timer_cb(struct event *t)
@@ -354,7 +374,6 @@ void pim_msdp_sa_ref(struct pim_instance *pim, struct pim_msdp_peer *mp,
 		     pim_sgaddr *sg, struct in_addr rp)
 {
 	struct pim_msdp_sa *sa;
-	struct rp_info *rp_info;
 	struct prefix grp;
 
 	/* Check peer SA limit. */
@@ -395,12 +414,7 @@ void pim_msdp_sa_ref(struct pim_instance *pim, struct pim_msdp_peer *mp,
 
 			/* send an immediate SA update to peers */
 			pim_addr_to_prefix(&grp, sa->sg.grp);
-			rp_info = pim_rp_find_match_group(pim, &grp);
+			pim_msdp_originator_id(pim, &grp, &sa->rp);
-			if (rp_info) {
-				sa->rp = rp_info->rp.rpf_addr;
-			} else {
-				sa->rp = pim->msdp.originator_id;
-			}
 			pim_msdp_pkt_sa_tx_one(sa);
 		}
 		sa->flags &= ~PIM_MSDP_SAF_STALE;
@@ -1013,8 +1027,6 @@ struct pim_msdp_peer *pim_msdp_peer_add(struct pim_instance *pim,
 	mp->peer = *peer;
 	pim_inet4_dump("<peer?>", mp->peer, mp->key_str, sizeof(mp->key_str));
 	mp->local = *local;
-	/* XXX: originator_id setting needs to move to the mesh group */
-	pim->msdp.originator_id = *local;
 	if (mesh_group_name)
 		mp->mesh_group_name =
 			XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name);
@@ -1340,6 +1352,12 @@ bool pim_msdp_peer_config_write(struct vty *vty, struct pim_instance *pim)
 		written = true;
 	}
 
+	if (pim->msdp.originator_id.s_addr != INADDR_ANY)
+		vty_out(vty, " msdp originator-id %pI4\n", &pim->msdp.originator_id);
+
+	if (pim->msdp.shutdown)
+		vty_out(vty, " msdp shutdown\n");
+
 	return written;
 }
 

pimd/pim_msdp.h

@@ -341,6 +341,16 @@ void pim_msdp_peer_restart(struct pim_msdp_peer *mp);
  */
 void pim_msdp_shutdown(struct pim_instance *pim, bool state);
 
+/**
+ * Get the configured originator ID for the SA RP field or the RP for the group.
+ *
+ * \param[in] pim PIM instance that MSDP connection belongs to.
+ * \param[in] group Multicast group.
+ * \param[out] originator_id Originator output value.
+ */
+void pim_msdp_originator_id(struct pim_instance *pim, const struct prefix *group,
+			    struct in_addr *originator_id);
+
 extern bool pim_msdp_log_neighbor_events(const struct pim_instance *pim);
 extern bool pim_msdp_log_sa_events(const struct pim_instance *pim);
 

pimd/pim_msdp_packet.c

@@ -409,7 +409,6 @@ static void pim_msdp_pkt_sa_gen(struct pim_instance *pim,
 {
 	struct listnode *sanode;
 	struct pim_msdp_sa *sa;
-	struct rp_info *rp_info;
 	struct prefix group_all;
 	struct in_addr rp;
 	int sa_count;
@@ -420,14 +419,8 @@ static void pim_msdp_pkt_sa_gen(struct pim_instance *pim,
 		zlog_debug("  sa gen  %d", local_cnt);
 	}
 
-	rp = pim->msdp.originator_id;
+	pim_get_all_mcast_group(&group_all);
-	if (pim_get_all_mcast_group(&group_all)) {
+	pim_msdp_originator_id(pim, &group_all, &rp);
-	    rp_info = pim_rp_find_match_group(pim, &group_all);
-	    if (rp_info) {
-	        rp = rp_info->rp.rpf_addr;
-	    }
-	}
-
 	local_cnt = pim_msdp_pkt_sa_fill_hdr(pim, local_cnt, rp);
 
 	for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) {
@@ -457,8 +450,7 @@ static void pim_msdp_pkt_sa_gen(struct pim_instance *pim,
 				zlog_debug("  sa gen for remainder %d",
 					   local_cnt);
 			}
-			local_cnt = pim_msdp_pkt_sa_fill_hdr(
+			local_cnt = pim_msdp_pkt_sa_fill_hdr(pim, local_cnt, rp);
-				pim, local_cnt, rp);
 		}
 	}
 

pimd/pim_nb.c

@@ -141,6 +141,13 @@ const struct frr_yang_module_info frr_pim_info = {
 				.modify = pim_msdp_log_sa_events_modify,
 			}
 		},
+		{
+			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp/originator-id",
+			.cbs = {
+				.modify = pim_msdp_originator_id_modify,
+				.destroy = pim_msdp_originator_id_destroy,
+			}
+		},
 		{
 			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp/shutdown",
 			.cbs = {

pimd/pim_nb.h

@@ -56,6 +56,8 @@ int pim_msdp_keep_alive_modify(struct nb_cb_modify_args *args);
 int pim_msdp_connection_retry_modify(struct nb_cb_modify_args *args);
 int pim_msdp_log_neighbor_events_modify(struct nb_cb_modify_args *args);
 int pim_msdp_log_sa_events_modify(struct nb_cb_modify_args *args);
+int pim_msdp_originator_id_modify(struct nb_cb_modify_args *args);
+int pim_msdp_originator_id_destroy(struct nb_cb_destroy_args *args);
 int pim_msdp_shutdown_modify(struct nb_cb_modify_args *args);
 int pim_msdp_mesh_group_create(struct nb_cb_create_args *args);
 int pim_msdp_mesh_group_destroy(struct nb_cb_destroy_args *args);

pimd/pim_nb_config.c

@@ -1037,6 +1037,8 @@ pim6_msdp_err(pim_msdp_peer_authentication_key_modify, nb_cb_modify_args);
 pim6_msdp_err(pim_msdp_peer_authentication_key_destroy, nb_cb_destroy_args);
 pim6_msdp_err(pim_msdp_log_neighbor_events_modify, nb_cb_modify_args);
 pim6_msdp_err(pim_msdp_log_sa_events_modify, nb_cb_modify_args);
+pim6_msdp_err(pim_msdp_originator_id_modify, nb_cb_modify_args);
+pim6_msdp_err(pim_msdp_originator_id_destroy, nb_cb_destroy_args);
 pim6_msdp_err(pim_msdp_shutdown_modify, nb_cb_modify_args);
 
 #if PIM_IPV != 6
@@ -1171,6 +1173,50 @@ int pim_msdp_log_sa_events_modify(struct nb_cb_modify_args *args)
 	return NB_OK;
 }
 
+/*
+ * XPath:
+ * /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp/originator-id
+ */
+int pim_msdp_originator_id_modify(struct nb_cb_modify_args *args)
+{
+	struct pim_instance *pim;
+	struct vrf *vrf;
+
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		vrf = nb_running_get_entry(args->dnode, NULL, true);
+		pim = vrf->info;
+		yang_dnode_get_ipv4(&pim->msdp.originator_id, args->dnode, NULL);
+		break;
+	}
+
+	return NB_OK;
+}
+
+int pim_msdp_originator_id_destroy(struct nb_cb_destroy_args *args)
+{
+	struct pim_instance *pim;
+	struct vrf *vrf;
+
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		vrf = nb_running_get_entry(args->dnode, NULL, true);
+		pim = vrf->info;
+		pim->msdp.originator_id.s_addr = INADDR_ANY;
+		break;
+	}
+
+	return NB_OK;
+}
+
 /*
  * XPath:
  * /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp/shutdown

yang/frr-pim.yang

@@ -269,6 +269,14 @@ module frr-pim {
           "Log all MSDP SA related events.";
       }
 
+      leaf originator-id {
+        type inet:ip-address;
+        description
+          "Configure the RP address for the SAs.
+
+           By default the local system RP address will be used.";
+      }
+
       leaf shutdown {
         type boolean;
         default false;