implement adding/deleting routes on AIX, for IPv4 and IPv6

AIX only has TAP interfaces, so always use gateway address as next hop,
not interface name.

AIX route works much more reliable if passed netbits than netmask - do so
(introducing a new helper function netmask_to_netbits2())
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <1402409073-54067216-4-git-send-email-gert@greenie.muc.de>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8785

Signed-off-by: Gert Doering <gert@greenie.muc.de>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/openvpn/route.c b/src/openvpn/route.c
index 5531eda..5428e76 100644
--- a/src/openvpn/route.c
+++ b/src/openvpn/route.c
@@ -1482,6 +1482,17 @@ add_route (struct route_ipv4 *r,
   argv_msg (D_ROUTE, &argv);
   status = openvpn_execve_check (&argv, es, 0, "ERROR: OpenBSD/NetBSD route add command failed");
 
+#elif defined(TARGET_AIX)
+
+  {
+  int netbits = netmask_to_netbits2(r->netmask);
+  argv_printf (&argv, "%s add -net %s/%d %s",
+		ROUTE_PATH,
+	        network, netbits, gateway);
+  argv_msg (D_ROUTE, &argv);
+  status = openvpn_execve_check (&argv, es, 0, "ERROR: AIX route add command failed");
+  }
+
 #else
   msg (M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system.  Try putting your routes in a --route-up script");
 #endif
@@ -1701,6 +1712,14 @@ add_route_ipv6 (struct route_ipv6 *r6, const struct tuntap *tt, unsigned int fla
   argv_msg (D_ROUTE, &argv);
   status = openvpn_execve_check (&argv, es, 0, "ERROR: NetBSD route add -inet6 command failed");
 
+#elif defined(TARGET_AIX)
+
+  argv_printf (&argv, "%s add -inet6 %s/%d %s",
+		ROUTE_PATH,
+	        network, r6->netbits, gateway);
+  argv_msg (D_ROUTE, &argv);
+  status = openvpn_execve_check (&argv, es, 0, "ERROR: AIX route add command failed");
+
 #else
   msg (M_FATAL, "Sorry, but I don't know how to do 'route ipv6' commands on this operating system.  Try putting your routes in a --route-up script");
 #endif
@@ -1859,8 +1878,21 @@ delete_route (struct route_ipv4 *r,
 
   argv_msg (D_ROUTE, &argv);
   openvpn_execve_check (&argv, es, 0, "ERROR: OpenBSD/NetBSD route delete command failed");
+
 #elif defined(TARGET_ANDROID)
   msg (M_NONFATAL, "Sorry, deleting routes on Android is not possible. The VpnService API allows routes to be set on connect only.");
+
+#elif defined(TARGET_AIX)
+
+  {
+  int netbits = netmask_to_netbits2(r->netmask);
+  argv_printf (&argv, "%s delete -net %s/%d %s",
+		ROUTE_PATH,
+	        network, netbits, gateway);
+  argv_msg (D_ROUTE, &argv);
+  openvpn_execve_check (&argv, es, 0, "ERROR: AIX route delete command failed");
+  }
+
 #else
   msg (M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system.  Try putting your routes in a --route-up script");
 #endif
@@ -2031,6 +2063,14 @@ delete_route_ipv6 (const struct route_ipv6 *r6, const struct tuntap *tt, unsigne
   argv_msg (D_ROUTE, &argv);
   openvpn_execve_check (&argv, es, 0, "ERROR: NetBSD route delete -inet6 command failed");
 
+#elif defined(TARGET_AIX)
+
+  argv_printf (&argv, "%s delete -inet6 %s/%d %s",
+		ROUTE_PATH,
+	        network, r6->netbits, gateway);
+  argv_msg (D_ROUTE, &argv);
+  openvpn_execve_check (&argv, es, 0, "ERROR: AIX route add command failed");
+
 #else
   msg (M_FATAL, "Sorry, but I don't know how to do 'route ipv6' commands on this operating system.  Try putting your routes in a --route-down script");
 #endif
@@ -2868,6 +2908,26 @@ netmask_to_netbits (const in_addr_t network, const in_addr_t netmask, int *netbi
   return false;
 }
 
+/* similar to netmask_to_netbits(), but don't mess with base address
+ * etc., just convert to netbits - non-mappable masks are returned as "-1"
+ */
+int netmask_to_netbits2 (in_addr_t netmask)
+{
+  int i;
+  const int addrlen = sizeof (in_addr_t) * 8;
+
+  for (i = 0; i <= addrlen; ++i)
+    {
+      in_addr_t mask = netbits_to_netmask (i);
+      if (mask == netmask)
+	{
+	  return i;
+	}
+    }
+  return -1;
+}
+
+
 /*
  * get_bypass_addresses() is used by the redirect-gateway bypass-x
  * functions to build a route bypass to selected DHCP/DNS servers,