1 files changed, 36 insertions, 0 deletions

diff --git a/nacl/curvecp/socket_udp.c b/nacl/curvecp/socket_udp.c
new file mode 100644
index 00000000..f64762f1
--- /dev/null
+++ b/nacl/curvecp/socket_udp.c
@@ -0,0 +1,36 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include "socket.h"
+#include "blocking.h"
+
+static void enable_bsd_fragmentation(int fd)
+{
+#ifdef IP_DONTFRAG
+  const int x = 0;
+  setsockopt(fd,SOL_IP,IP_DONTFRAG,&x,sizeof x);
+#endif
+}
+
+static void enable_linux_fragmentation(int fd)
+{
+#ifdef IP_MTU_DISCOVER
+#ifdef IP_PMTUDISC_DONT
+  const int x = IP_PMTUDISC_DONT;
+  setsockopt(fd,SOL_IP,IP_MTU_DISCOVER,&x,sizeof x);
+#endif
+#endif
+}
+
+int socket_udp(void)
+{
+  int fd = socket(PF_INET,SOCK_DGRAM,0);
+  if (fd == -1) return -1;
+  fcntl(fd,F_SETFD,1);
+  blocking_disable(fd);
+  enable_bsd_fragmentation(fd);
+  enable_linux_fragmentation(fd);
+  return fd;
+}