From b653e9e6411ce05181e0721c6e44134589399182 Mon Sep 17 00:00:00 2001
From: Joseph Henry <josephjah@gmail.com>
Date: Tue, 1 Aug 2017 14:18:21 -0700
Subject: [PATCH] Updated README.md

---
 README.md       |  4 +++-
 include/libzt.h | 18 ++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 31dbc96..319544d 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 <a href="https://www.zerotier.com?pk_campaign=github_libzt"><img src="https://github.com/zerotier/ZeroTierOne/raw/master/artwork/AppIcon_87x87.png" align="left" hspace="20" vspace="6"></a>
 
-**ZeroTier** makes it easy to securely connect devices, servers, cloud VMs, containers, and apps everywhere and manage them at scale. Now, with **libzt** you can bake this ability directly into your app or service using your preferred language or framework. We provide a BSD socket-like API to make the integration simple and there's no longer any need for system-wide virtual interfaces. This connection is exclusive to your app.
+**ZeroTier** makes it easy to securely connect devices, servers, cloud VMs, containers, and apps everywhere and manage them at scale. Now, with **libzt** you can bake this ability directly into your app or service using your preferred language or framework. We provide a BSD socket-like API supporting `SOCK_STREAM`, `SOCK_DGRAM`, and `SOCK_RAW` to make the integration simple. There's also no longer any need for system-wide virtual interfaces. This connection is exclusive to your app and fully encrypted via the [Salsa20](https://en.wikipedia.org/wiki/Salsa20) cipher.
 
 <hr>
 
@@ -39,6 +39,8 @@ zts_close(fd);
 
 Bindings for various [languages](examples)
 
+For an example using only the Virtual Layer 2, see [test/layer2.cpp](test/layer2.cpp)
+
 ***
 
 ### Building (linux, macos, bsd, win, ios)
diff --git a/include/libzt.h b/include/libzt.h
index ec77738..3f88eba 100644
--- a/include/libzt.h
+++ b/include/libzt.h
@@ -29,6 +29,18 @@
 
 #include <sys/socket.h>
 #include <poll.h>
+#include <net/if.h>
+
+/****************************************************************************/
+/* For SOCK_RAW support, it will initially be modeled after linux's API, so */
+/* below are the various things we need to define in order to make this API */
+/* work on other platforms. Mayber later down the road we will customize    */
+/* this for each different platform. Maybe.                                 */
+/****************************************************************************/
+#if !defined(__linux__)
+#define SIOCGIFINDEX  101
+#define SIOCGIFHWADDR 102
+#endif
 
 /****************************************************************************/
 /* LWIP                                                                     */
@@ -140,6 +152,7 @@
 #define ZT_GETSOCKNAME_SIG int fd, struct sockaddr *addr, socklen_t *addrlen
 #define ZT_GETPEERNAME_SIG int fd, struct sockaddr *addr, socklen_t *addrlen
 #define ZT_FCNTL_SIG int fd, int cmd, int flags
+#define ZT_IOCTL_SIG int fd, unsigned long request, void *argp
 #define ZT_SYSCALL_SIG long number, ...
 
 /****************************************************************************/
@@ -367,6 +380,11 @@ int zts_select(ZT_SELECT_SIG);
  */
 int zts_fcntl(ZT_FCNTL_SIG);
 
+/**
+ * Control a device
+ */
+int zts_ioctl(ZT_IOCTL_SIG);
+
 /**
  * Send data to a remote host
  */