ospfd: api: add reachable router notifications

Reachable router information is used by OSPF opaque clients in order
to determine if the router advertising the opaque LSA data is
reachable (i.e., 2-way conectivity check).

Signed-off-by: Christian Hopps <chopps@labn.net>

1 files changed, 31 insertions, 0 deletions

diff --git a/ospfd/ospf_api.c b/ospfd/ospf_api.c
index 81de882754..99bc6c0b03 100644
--- a/ospfd/ospf_api.c
+++ b/ospfd/ospf_api.c
@@ -177,6 +177,10 @@ const char *ospf_api_typename(int msgtype)
 		{
 			MSG_NSM_CHANGE, "NSM change",
 		},
+		{
+			MSG_REACHABLE_CHANGE,
+			"Reachable change",
+		},
 	};
 
 	int i, n = array_size(NameTab);
@@ -651,4 +655,31 @@ struct msg *new_msg_lsa_change_notify(uint8_t msgtype, uint32_t seqnum,
 	return msg_new(msgtype, nmsg, seqnum, len);
 }
 
+struct msg *new_msg_reachable_change(uint32_t seqnum, uint16_t nadd,
+				     struct in_addr *add, uint16_t nremove,
+				     struct in_addr *remove)
+{
+	uint8_t buf[OSPF_API_MAX_MSG_SIZE];
+	struct msg_reachable_change *nmsg = (void *)buf;
+	const uint insz = sizeof(*nmsg->router_ids);
+	const uint nmax = (sizeof(buf) - sizeof(*nmsg)) / insz;
+	uint len;
+
+	if (nadd > nmax)
+		nadd = nmax;
+	if (nremove > (nmax - nadd))
+		nremove = (nmax - nadd);
+
+	if (nadd)
+		memcpy(nmsg->router_ids, add, nadd * insz);
+	if (nremove)
+		memcpy(&nmsg->router_ids[nadd], remove, nremove * insz);
+
+	nmsg->nadd = htons(nadd);
+	nmsg->nremove = htons(nremove);
+	len = sizeof(*nmsg) + insz * (nadd + nremove);
+
+	return msg_new(MSG_REACHABLE_CHANGE, nmsg, seqnum, len);
+}
+
 #endif /* SUPPORT_OSPF_API */