Also I wrote problem report 211717.

• In log

2016-08-07 02:28:55 <ERR> KRT: Error sending route 10.120.1.98/32 to kernel: Address family not supported by protocol family

• In route monitor

got message of size 128 on Sun Aug  7 19:52:27 2016
RTM_ADD: Add Route: len 128, pid: 3683, seq 312, errno 22, flags:<UP,GATEWAY,HOST,PROTO1>
locks:  inits: 
sockaddrs: <DST,GATEWAY>

pmsg_addrs: truncated route message, only 36 bytes left

Incorrect packing of route message to kernel.

bird.patch

--- ./sysdep/bsd/krt-sock.c.orig        2016-04-29 11:13:23.000000000 +0200
+++ ./sysdep/bsd/krt-sock.c     2016-08-08 00:12:32.516209000 +0200
@@ -167,13 +167,14 @@
 struct ks_msg
 {
   struct rt_msghdr rtm;
-  struct sockaddr_storage buf[RTAX_MAX];
+  struct  sockaddr_in buf[RTAX_MAX];
 };
 
 #define ROUNDUP(a) \
         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
 
-#define NEXTADDR(w, u) \
+#define __NEXTADDR(w, u) \
         if (msg.rtm.rtm_addrs & (w)) {\
           l = ROUNDUP(((struct sockaddr *)&(u))->sa_len);\
           memmove(body, &(u), l); body += l;}
@@ -185,6 +186,17 @@
     memcpy(p, body, (l > sizeof(*p) ? sizeof(*p) : l));\
     body += l;}
 
+
+#define NEXTADDR(w, u)                                                 \
+       if (msg.rtm.rtm_addrs & (w)) {                                          \
+               l = (((struct sockaddr *)&(u))->sa_len == 0) ?          \
+                   sizeof(long) :                                      \
+                   1 + ((((struct sockaddr *)&(u))->sa_len - 1)        \
+                       | (sizeof(long) - 1));                          \
+               memmove(body, &(u), l); body += l;                              \
+       }
+
+
 static int
 krt_send_route(struct krt_proto *p, int cmd, rte *e)
 {

# route -nv monitor
...
got message of size 140 on Sun Aug  7 16:57:43 2016
RTM_ADD: Add Route: len 140, pid: 8102, seq 82, errno 0, flags:<UP,GATEWAY,DONE,PROTO1>
locks:  inits: 
sockaddrs: <DST,GATEWAY,NETMASK>
 10.255.252.172 192.168.58.1 255.255.255.252

got message of size 124 on Sun Aug  7 16:57:43 2016
RTM_ADD: Add Route: len 124, pid: 8102, seq 83, errno 0, flags:<UP,GATEWAY,HOST,DONE,PROTO1>
locks:  inits: 
sockaddrs: <DST,GATEWAY>
 10.120.65.4 192.168.58.1