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+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * Support routines for adding/deleting network routes.
+ */
+
+#ifndef ROUTE_H
+#define ROUTE_H
+
+#include "tun.h"
+#include "misc.h"
+
+#define MAX_ROUTES_DEFAULT 100
+
+#ifdef WIN32
+/*
+ * Windows route methods
+ */
+#define ROUTE_METHOD_ADAPTIVE 0 /* try IP helper first then route.exe */
+#define ROUTE_METHOD_IPAPI 1 /* use IP helper API */
+#define ROUTE_METHOD_EXE 2 /* use route.exe */
+#define ROUTE_METHOD_MASK 3
+#endif
+
+/*
+ * Route add flags (must stay clear of ROUTE_METHOD bits)
+ */
+#define ROUTE_DELETE_FIRST 4
+
+struct route_bypass
+{
+# define N_ROUTE_BYPASS 8
+ int n_bypass;
+ in_addr_t bypass[N_ROUTE_BYPASS];
+};
+
+struct route_special_addr
+{
+ in_addr_t remote_endpoint;
+ bool remote_endpoint_defined;
+ in_addr_t net_gateway;
+ bool net_gateway_defined;
+ in_addr_t remote_host;
+ bool remote_host_defined;
+ struct route_bypass bypass;
+ int default_metric;
+ bool default_metric_defined;
+};
+
+struct route_option {
+ const char *network;
+ const char *netmask;
+ const char *gateway;
+ const char *metric;
+};
+
+/* redirect-gateway flags */
+#define RG_ENABLE (1<<0)
+#define RG_LOCAL (1<<1)
+#define RG_DEF1 (1<<2)
+#define RG_BYPASS_DHCP (1<<3)
+#define RG_BYPASS_DNS (1<<4)
+#define RG_REROUTE_GW (1<<5)
+#define RG_AUTO_LOCAL (1<<6)
+
+struct route_option_list {
+ unsigned int flags;
+ int capacity;
+ int n;
+ struct route_option routes[EMPTY_ARRAY_SIZE];
+};
+
+struct route {
+ bool defined;
+ const struct route_option *option;
+ in_addr_t network;
+ in_addr_t netmask;
+ in_addr_t gateway;
+ bool metric_defined;
+ int metric;
+};
+
+struct route_list {
+ bool routes_added;
+ struct route_special_addr spec;
+ unsigned int flags;
+ bool did_redirect_default_gateway;
+ bool did_local;
+ int capacity;
+ int n;
+ struct route routes[EMPTY_ARRAY_SIZE];
+};
+
+#if P2MP
+/* internal OpenVPN route */
+struct iroute {
+ in_addr_t network;
+ int netbits;
+ struct iroute *next;
+};
+#endif
+
+struct route_option_list *new_route_option_list (const int max_routes, struct gc_arena *a);
+struct route_option_list *clone_route_option_list (const struct route_option_list *src, struct gc_arena *a);
+void copy_route_option_list (struct route_option_list *dest, const struct route_option_list *src);
+
+struct route_list *new_route_list (const int max_routes, struct gc_arena *a);
+
+void add_route (struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es);
+
+void add_route_to_option_list (struct route_option_list *l,
+ const char *network,
+ const char *netmask,
+ const char *gateway,
+ const char *metric);
+
+bool init_route_list (struct route_list *rl,
+ const struct route_option_list *opt,
+ const char *remote_endpoint,
+ int default_metric,
+ in_addr_t remote_host,
+ struct env_set *es);
+
+void route_list_add_default_gateway (struct route_list *rl,
+ struct env_set *es,
+ const in_addr_t addr);
+
+void add_routes (struct route_list *rl,
+ const struct tuntap *tt,
+ unsigned int flags,
+ const struct env_set *es);
+
+void delete_routes (struct route_list *rl,
+ const struct tuntap *tt,
+ unsigned int flags,
+ const struct env_set *es);
+
+void setenv_routes (struct env_set *es, const struct route_list *rl);
+
+bool is_special_addr (const char *addr_str);
+
+bool get_default_gateway (in_addr_t *ip, in_addr_t *netmask);
+
+/*
+ * Test if addr is reachable via a local interface (return ILA_LOCAL),
+ * or if it needs to be routed via the default gateway (return
+ * ILA_NONLOCAL). If the current platform doesn't implement this
+ * function, return ILA_NOT_IMPLEMENTED.
+ */
+#define TLA_NOT_IMPLEMENTED 0
+#define TLA_NONLOCAL 1
+#define TLA_LOCAL 2
+int test_local_addr (const in_addr_t addr);
+
+#if AUTO_USERID || defined(ENABLE_PUSH_PEER_INFO)
+bool get_default_gateway_mac_addr (unsigned char *macaddr);
+#endif
+
+#ifdef ENABLE_DEBUG
+void print_route_options (const struct route_option_list *rol,
+ int level);
+#endif
+
+void print_routes (const struct route_list *rl, int level);
+
+#ifdef WIN32
+
+void show_routes (int msglev);
+bool test_routes (const struct route_list *rl, const struct tuntap *tt);
+bool add_route_ipapi (const struct route *r, const struct tuntap *tt);
+bool del_route_ipapi (const struct route *r, const struct tuntap *tt);
+
+#else
+static inline bool test_routes (const struct route_list *rl, const struct tuntap *tt) { return true; }
+#endif
+
+bool netmask_to_netbits (const in_addr_t network, const in_addr_t netmask, int *netbits);
+
+static inline in_addr_t
+netbits_to_netmask (const int netbits)
+{
+ const int addrlen = sizeof (in_addr_t) * 8;
+ in_addr_t mask = 0;
+ if (netbits > 0 && netbits <= addrlen)
+ mask = ~0 << (addrlen-netbits);
+ return mask;
+}
+
+static inline bool
+route_list_default_gateway_needed (const struct route_list *rl)
+{
+ if (!rl)
+ return false;
+ else
+ return !rl->spec.remote_endpoint_defined;
+}
+
+#endif