3 files changed, 29 insertions, 8 deletions
diff --git a/proto/bfd/bfd.c b/proto/bfd/bfd.c
index 3ba3a5d9..110bf931 100644
--- a/proto/bfd/bfd.c
+++ b/proto/bfd/bfd.c
@@ -981,8 +981,10 @@ bfd_start(struct proto *P)
   add_tail(&bfd_proto_list, &p->bfd_node);
 
   birdloop_enter(p->loop);
-  p->rx_1 = bfd_open_rx_sk(p, 0);
-  p->rx_m = bfd_open_rx_sk(p, 1);
+  p->rx4_1 = bfd_open_rx_sk(p, 0, 4);
+  p->rx4_m = bfd_open_rx_sk(p, 1, 4);
+  p->rx6_1 = bfd_open_rx_sk(p, 0, 6);
+  p->rx6_m = bfd_open_rx_sk(p, 1, 6);
   birdloop_leave(p->loop);
 
   bfd_take_requests(p);
diff --git a/proto/bfd/bfd.h b/proto/bfd/bfd.h
index 9b61be64..ce7d665b 100644
--- a/proto/bfd/bfd.h
+++ b/proto/bfd/bfd.h
@@ -84,8 +84,10 @@ struct bfd_proto
   sock *notify_ws;
   list notify_list;
 
-  sock *rx_1;
-  sock *rx_m;
+  sock *rx4_1;
+  sock *rx6_1;
+  sock *rx4_m;
+  sock *rx6_m;
   list iface_list;
 };
 
@@ -184,7 +186,7 @@ void bfd_show_sessions(struct proto *P);
 
 /* packets.c */
 void bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final);
-sock * bfd_open_rx_sk(struct bfd_proto *p, int multihop);
+sock * bfd_open_rx_sk(struct bfd_proto *p, int multihop, int inet_version);
 sock * bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa);
 
 
diff --git a/proto/bfd/packets.c b/proto/bfd/packets.c
index 2200acfa..a28e4c50 100644
--- a/proto/bfd/packets.c
+++ b/proto/bfd/packets.c
@@ -186,7 +186,7 @@ bfd_err_hook(sock *sk, int err)
 }
 
 sock *
-bfd_open_rx_sk(struct bfd_proto *p, int multihop)
+bfd_open_rx_sk(struct bfd_proto *p, int multihop, int inet_version)
 {
   sock *sk = sk_new(p->tpool);
   sk->type = SK_UDP;
@@ -202,7 +202,18 @@ bfd_open_rx_sk(struct bfd_proto *p, int multihop)
   sk->priority = sk_priority_control;
   sk->flags = SKF_THREAD | SKF_LADDR_RX | (!multihop ? SKF_TTL_RX : 0);
 
-  sk->af = AF_INET6;
+  switch (inet_version) {
+    case 4:
+      sk->af = AF_INET;
+      sk->flags |= SKF_V4ONLY;
+      break;
+    case 6:
+      sk->af = AF_INET6;
+      sk->flags |= SKF_V6ONLY;
+      break;
+    default:
+      ASSERT(0);
+  }
 
   if (sk_open(sk) < 0)
     goto err;
@@ -235,7 +246,13 @@ bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa)
   sk->ttl = ifa ? 255 : -1;
   sk->flags = SKF_THREAD | SKF_BIND | SKF_HIGH_PORT;
 
-  sk->af = AF_INET6;
+  if (ipa_is_ip4(local)) {
+    sk->af = AF_INET;
+    sk->flags |= SKF_V4ONLY;
+  } else {
+    sk->af = AF_INET6;
+    sk->flags |= SKF_V6ONLY;
+  }
 
   if (sk_open(sk) < 0)
     goto err;