From ce1cca39d7935dd394080ce2df62f5ce5b51f485 Mon Sep 17 00:00:00 2001
From: Damien Miller <djm@mindrot.org>
Date: Wed, 25 Oct 2017 13:47:59 +1100
Subject: [PATCH] implement get/set_rdomain() for Linux

Not enabled, pending implementation of valid_rdomain() and autoconf glue
---
 openbsd-compat/port-net.c | 40 +++++++++++++++++++++++++++++++++++++--
 openbsd-compat/port-net.h |  7 +++++--
 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/openbsd-compat/port-net.c b/openbsd-compat/port-net.c
index d384b1454..f6e32ad49 100644
--- a/openbsd-compat/port-net.c
+++ b/openbsd-compat/port-net.c
@@ -41,7 +41,44 @@
  * including tun/tap forwarding and routing domains.
  */
 
-#if defined(SYS_RDOMAIN_XXX)
+#if defined(SYS_RDOMAIN_LINUX) || defined(SSH_TUN_LINUX)
+#include <linux/if.h>
+#endif
+
+#if defined(SYS_RDOMAIN_LINUX)
+char *
+sys_get_rdomain(int fd)
+{
+	char dev[IFNAMSIZ + 1];
+	socklen_t len = sizeof(dev) - 1;
+
+	if (getsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, dev, &len) == -1) {
+		error("%s: cannot determine VRF for fd=%d : %s",
+		    __func__, fd, strerror(errno));
+		return NULL;
+	}
+	dev[len] = '\0';
+	return strdup(dev);
+}
+
+int
+sys_set_rdomain(int fd, const char *name)
+{
+	if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
+	    name, strlen(name)) == -1) {
+		error("%s: setsockopt(%d, SO_BINDTODEVICE, %s): %s",
+		      __func__, fd, name, strerror(errno));
+		return -1;
+	}
+	return 0;
+}
+
+int
+valid_rdomain(const char *name)
+{
+	return 0;
+}
+#elif defined(SYS_RDOMAIN_XXX)
 /* XXX examples */
 char *
 sys_get_rdomain(int fd)
@@ -84,7 +121,6 @@ sys_set_process_rdomain(const char *name)
  */
 
 #if defined(SSH_TUN_LINUX)
-#include <linux/if.h>
 #include <linux/if_tun.h>
 
 int
diff --git a/openbsd-compat/port-net.h b/openbsd-compat/port-net.h
index 715e9fb34..8aa4085f4 100644
--- a/openbsd-compat/port-net.h
+++ b/openbsd-compat/port-net.h
@@ -31,14 +31,17 @@ int	 sys_tun_infilter(struct ssh *, struct Channel *, char *, int);
 u_char	*sys_tun_outfilter(struct ssh *, struct Channel *, u_char **, size_t *);
 #endif
 
-#if defined(SYS_RDOMAIN_XXX)
+#if defined(SYS_RDOMAIN_LINUX)
 # define HAVE_SYS_GET_RDOMAIN
 # define HAVE_SYS_SET_RDOMAIN
-# define HAVE_SYS_SET_PROCESS_RDOMAIN
 # define HAVE_SYS_VALID_RDOMAIN
 char *sys_get_rdomain(int fd);
 int sys_set_rdomain(int fd, const char *name);
 int valid_rdomain(const char *name);
+#endif
+
+#if defined(SYS_RDOMAIN_XXX)
+# define HAVE_SYS_SET_PROCESS_RDOMAIN
 void sys_set_process_rdomain(const char *name);
 #endif