From 9c89560e6cdf44a21b2eff8765973ed8665fa07f Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Sun, 22 Feb 2015 20:14:14 +0100
Subject: [PATCH] Use IP_PORTRANGE_HIGH for BFD where available

---
 lib/socket.h        |  1 +
 proto/bfd/packets.c |  2 +-
 sysdep/unix/io.c    | 16 +++++++++++-----
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/lib/socket.h b/lib/socket.h
index a5b85aa2..683cdde3 100644
--- a/lib/socket.h
+++ b/lib/socket.h
@@ -103,6 +103,7 @@ extern int sk_priority_control;		/* Suggested priority for control traffic, shou
 #define SKF_LADDR_RX	0x04	/* Report local address for RX packets */
 #define SKF_TTL_RX	0x08	/* Report TTL / Hop Limit for RX packets */
 #define SKF_BIND	0x10	/* Bind datagram socket to given source address */
+#define SKF_HIGH_PORT	0x20	/* Choose port from high range if possible */
 
 #define SKF_THREAD	0x100	/* Socked used in thread, Do not add to main loop */
 #define SKF_TRUNCATED	0x200	/* Received packet was truncated, set by IO layer */
diff --git a/proto/bfd/packets.c b/proto/bfd/packets.c
index 8818453b..b5fd6782 100644
--- a/proto/bfd/packets.c
+++ b/proto/bfd/packets.c
@@ -231,7 +231,7 @@ bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa)
   sk->tos = IP_PREC_INTERNET_CONTROL;
   sk->priority = sk_priority_control;
   sk->ttl = ifa ? 255 : -1;
-  sk->flags = SKF_THREAD | SKF_BIND;
+  sk->flags = SKF_THREAD | SKF_BIND | SKF_HIGH_PORT;
 
 #ifdef IPV6
   sk->flags |= SKF_V6ONLY;
diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index 04f0fe50..daf9d054 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -1305,7 +1305,7 @@ sk_passive_connected(sock *s, int type)
     log(L_ERR "SOCK: Incoming connection: %s%#m", t->err);
 
     /* FIXME: handle it better in rfree() */
-    close(t->fd);	
+    close(t->fd);
     t->fd = -1;
     rfree(t);
     return 1;
@@ -1348,7 +1348,7 @@ sk_open(sock *s)
     bind_addr = s->saddr;
     do_bind = bind_port || ipa_nonzero(bind_addr);
     break;
-  
+
   case SK_UDP:
     fd = socket(af, SOCK_DGRAM, IPPROTO_UDP);
     bind_port = s->sport;
@@ -1399,6 +1399,14 @@ sk_open(sock *s)
       }
 #endif
     }
+#ifdef IP_PORTRANGE
+    else if (s->flags & SKF_HIGH_PORT)
+    {
+      int range = IP_PORTRANGE_HIGH;
+      if (setsockopt(fd, IPPROTO_IP, IP_PORTRANGE, &range, sizeof(range)) < 0)
+        log(L_WARN "Socket error: %s%#m", "IP_PORTRANGE");
+    }
+#endif
 
     sockaddr_fill(&sa, af, bind_addr, s->iface, bind_port);
     if (bind(fd, &sa.sa, SA_LEN(sa)) < 0)
@@ -1661,7 +1669,7 @@ sk_rx_ready(sock *s)
 
  redo:
   rv = select(s->fd+1, &rd, &wr, NULL, &timo);
-  
+
   if ((rv < 0) && (errno == EINTR || errno == EAGAIN))
     goto redo;
 
@@ -2026,5 +2034,3 @@ test_old_bird(char *path)
     die("I found another BIRD running.");
   close(fd);
 }
-
-