/*
* 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) 2002-2018 OpenVPN 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Support routines for adding/deleting network routes.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#include "syshead.h"
#include "common.h"
#include "error.h"
#include "route.h"
#include "run_command.h"
#include "socket.h"
#include "manage.h"
#include "win32.h"
#include "options.h"
#include "memdbg.h"
#if defined(TARGET_LINUX) || defined(TARGET_ANDROID)
#include <linux/rtnetlink.h> /* RTM_GETROUTE etc. */
#endif
#ifdef _WIN32
#include "openvpn-msg.h"
#define METRIC_NOT_USED ((DWORD)-1)
static bool add_route_service(const struct route_ipv4 *, const struct tuntap *);
static bool del_route_service(const struct route_ipv4 *, const struct tuntap *);
static bool add_route_ipv6_service(const struct route_ipv6 *, const struct tuntap *);
static bool del_route_ipv6_service(const struct route_ipv6 *, const struct tuntap *);
#endif
static void delete_route(struct route_ipv4 *r, const struct tuntap *tt, unsigned int flags, const struct route_gateway_info *rgi, const struct env_set *es);
static void get_bypass_addresses(struct route_bypass *rb, const unsigned int flags);
#ifdef ENABLE_DEBUG
static void
print_bypass_addresses(const struct route_bypass *rb)
{
struct gc_arena gc = gc_new();
int i;
for (i = 0; i < rb->n_bypass; ++i)
{
msg(D_ROUTE, "ROUTE: bypass_host_route[%d]=%s",
i,
print_in_addr_t(rb->bypass[i], 0, &gc));
}
gc_free(&gc);
}
#endif
static bool
add_bypass_address(struct route_bypass *rb, const in_addr_t a)
{
int i;
for (i = 0; i < rb->n_bypass; ++i)
{
if (a == rb->bypass[i]) /* avoid duplicates */
{
return true;
}
}
if (rb->n_bypass < N_ROUTE_BYPASS)
{
rb->bypass[rb->n_bypass++] = a;
return true;
}
else
{
return false;
}
}
struct route_option_list *
new_route_option_list(struct gc_arena *a)
{
struct route_option_list *ret;
ALLOC_OBJ_CLEAR_GC(ret, struct route_option_list, a);
ret->gc = a;
return ret;
}
struct route_ipv6_option_list *
new_route_ipv6_option_list(struct gc_arena *a)
{
struct route_ipv6_option_list *ret;
ALLOC_OBJ_CLEAR_GC(ret, struct route_ipv6_option_list, a);
ret->gc = a;
return ret;
}
/*
* NOTE: structs are cloned/copied shallow by design.
* The routes list from src will stay intact since it is allocated using
* the options->gc. The cloned/copied lists will share this common tail
* to avoid copying the data around between pulls. Pulled routes use
* the c2->gc so they get freed immediately after a reconnect.
*/
struct route_option_list *
clone_route_option_list(const struct route_option_list *src, struct gc_arena *a)
{
struct route_option_list *ret;
ALLOC_OBJ_GC(ret, struct route_option_list, a);
*ret = *src;
return ret;
}
struct route_ipv6_option_list *
clone_route_ipv6_option_list(const struct route_ipv6_option_list *src, struct gc_arena *a)
{
struct route_ipv6_option_list *ret;
ALLOC_OBJ_GC(ret, struct route_ipv6_option_list, a);
*ret = *src;
return ret;
}
void
copy_route_option_list(struct route_option_list *dest, const struct route_option_list *src, struct gc_arena *a)
{
*dest = *src;
dest->gc = a;
}
void
copy_route_ipv6_option_list(struct route_ipv6_option_list *dest,
const struct route_ipv6_option_list *src,
struct gc_arena *a)
{
*dest = *src;
dest->gc = a;
}
static const char *
route_string(const struct route_ipv4 *r, struct gc_arena *gc)
{
struct buffer out = alloc_buf_gc(256, gc);
buf_printf(&out, "ROUTE network %s netmask %s gateway %s",
print_in_addr_t(r->network, 0, gc),
print_in_addr_t(r->netmask, 0, gc),
print_in_addr_t(r->gateway, 0, gc)
);
if (r->flags & RT_METRIC_DEFINED)
{
buf_printf(&out, " metric %d", r->metric);
}
return BSTR(&out);
}
static bool
is_route_parm_defined(const char *parm)
{
if (!parm)
{
return false;
}
if (!strcmp(parm, "default"))
{
return false;
}
return true;
}
static void
setenv_route_addr(struct env_set *es, const char *key, const in_addr_t addr, int i)
{
struct gc_arena gc = gc_new();
struct buffer name = alloc_buf_gc(256, &gc);
if (i >= 0)
{
buf_printf(&name, "route_%s_%d", key, i);
}
else
{
buf_printf(&name, "route_%s", key);
}
setenv_str(es, BSTR(&name), print_in_addr_t(addr, 0, &gc));
gc_free(&gc);
}
static bool
get_special_addr(const struct route_list *rl,
const char *string,
in_addr_t *out,
bool *status)
{
if (status)
{
*status = true;
}
if (!strcmp(string, "vpn_gateway"))
{
if (rl)
{
if (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
{
*out = rl->spec.remote_endpoint;
}
else
{
msg(M_INFO, PACKAGE_NAME " ROUTE: vpn_gateway undefined");
if (status)
{
*status = false;
}
}
}
return true;
}
else if (!strcmp(string, "net_gateway"))
{
if (rl)
{
if (rl->rgi.flags & RGI_ADDR_DEFINED)
{
*out = rl->rgi.gateway.addr;
}
else
{
msg(M_INFO, PACKAGE_NAME " ROUTE: net_gateway undefined -- unable to get default gateway from system");
if (status)
{
*status = false;
}
}
}
return true;
}
else if (!strcmp(string, "remote_host"))
{
if (rl)
{
if (rl->spec.flags & RTSA_REMOTE_HOST)
{
*out = rl->spec.remote_host;
}
else
{
msg(M_INFO, PACKAGE_NAME " ROUTE: remote_host undefined");
if (status)
{
*status = false;
}
}
}
return true;
}
return false;
}
bool
is_special_addr(const char *addr_str)
{
if (addr_str)
{
return get_special_addr(NULL, addr_str, NULL, NULL);
}
else
{
return false;
}
}
static bool
init_route(struct route_ipv4 *r,
struct addrinfo **network_list,
const struct route_option *ro,
const struct route_list *rl)
{
const in_addr_t default_netmask = IPV4_NETMASK_HOST;
bool status;
int ret;
struct in_addr special;
CLEAR(*r);
r->option = ro;
/* network */
if (!is_route_parm_defined(ro->network))
{
goto fail;
}
/* get_special_addr replaces specialaddr with a special ip addr
* like gw. getaddrinfo is called to convert a a addrinfo struct */
if (get_special_addr(rl, ro->network, (in_addr_t *) &special.s_addr, &status))
{
special.s_addr = htonl(special.s_addr);
ret = openvpn_getaddrinfo(0, inet_ntoa(special), NULL, 0, NULL,
AF_INET, network_list);
}
else
{
ret = openvpn_getaddrinfo(GETADDR_RESOLVE | GETADDR_WARN_ON_SIGNAL,
ro->network, NULL, 0, NULL, AF_INET, network_list);
}
status = (ret == 0);
if (!status)
{
goto fail;
}
/* netmask */
if (is_route_parm_defined(ro->netmask))
{
r->netmask = getaddr(
GETADDR_HOST_ORDER
| GETADDR_WARN_ON_SIGNAL,
ro->netmask,
0,
&status,
NULL);
if (!status)
{
goto fail;
}
}
else
{
r->netmask = default_netmask;
}
/* gateway */
if (is_route_parm_defined(ro->gateway))
{
if (!get_special_addr(rl, ro->gateway, &r->gateway, &status))
{
r->gateway = getaddr(
GETADDR_RESOLVE
| GETADDR_HOST_ORDER
| GETADDR_WARN_ON_SIGNAL,
ro->gateway,
0,
&status,
NULL);
}
if (!status)
{
goto fail;
}
}
else
{
if (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
{
r->gateway = rl->spec.remote_endpoint;
}
else
{
msg(M_WARN, PACKAGE_NAME " ROUTE: " PACKAGE_NAME " needs a gateway parameter for a --route option and no default was specified by either --route-gateway or --ifconfig options");
goto fail;
}
}
/* metric */
r->metric = 0;
if (is_route_parm_defined(ro->metric))
{
r->metric = atoi(ro->metric);
if (r->metric < 0)
{
msg(M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0",
ro->network,
ro->metric);
goto fail;
}
r->flags |= RT_METRIC_DEFINED;
}
else if (rl->spec.flags & RTSA_DEFAULT_METRIC)
{
r->metric = rl->spec.default_metric;
r->flags |= RT_METRIC_DEFINED;
}
r->flags |= RT_DEFINED;
return true;
fail:
msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s",
ro->network);
return false;
}
static bool
init_route_ipv6(struct route_ipv6 *r6,
const struct route_ipv6_option *r6o,
const struct route_ipv6_list *rl6 )
{
CLEAR(*r6);
if (!get_ipv6_addr( r6o->prefix, &r6->network, &r6->netbits, M_WARN ))
{
goto fail;
}
/* gateway */
if (is_route_parm_defined(r6o->gateway))
{
if (inet_pton( AF_INET6, r6o->gateway, &r6->gateway ) != 1)
{
msg( M_WARN, PACKAGE_NAME "ROUTE6: cannot parse gateway spec '%s'", r6o->gateway );
}
}
else if (rl6->spec_flags & RTSA_REMOTE_ENDPOINT)
{
r6->gateway = rl6->remote_endpoint_ipv6;
}
else
{
msg(M_WARN, PACKAGE_NAME " ROUTE6: " PACKAGE_NAME " needs a gateway parameter for a --route-ipv6 option and no default was specified by either --route-ipv6-gateway or --ifconfig-ipv6 options");
goto fail;
}
/* metric */
r6->metric = -1;
if (is_route_parm_defined(r6o->metric))
{
r6->metric = atoi(r6o->metric);
if (r6->metric < 0)
{
msg(M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0",
r6o->prefix,
r6o->metric);
goto fail;
}
r6->flags |= RT_METRIC_DEFINED;
}
else if (rl6->spec_flags & RTSA_DEFAULT_METRIC)
{
r6->metric = rl6->default_metric;
r6->flags |= RT_METRIC_DEFINED;
}
r6->flags |= RT_DEFINED;
return true;
fail:
msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s",
r6o->prefix);
return false;
}
void
add_route_to_option_list(struct route_option_list *l,
const char *network,
const char *netmask,
const char *gateway,
const char *metric)
{
struct route_option *ro;
ALLOC_OBJ_GC(ro, struct route_option, l->gc);
ro->network = network;
ro->netmask = netmask;
ro->gateway = gateway;
ro->metric = metric;
ro->next = l->routes;
l->routes = ro;
}
void
add_route_ipv6_to_option_list(struct route_ipv6_option_list *l,
const char *prefix,
const char *gateway,
const char *metric)
{
struct route_ipv6_option *ro;
ALLOC_OBJ_GC(ro, struct route_ipv6_option, l->gc);
ro->prefix = prefix;
ro->gateway = gateway;
ro->metric = metric;
ro->next = l->routes_ipv6;
l->routes_ipv6 = ro;
}
static void
clear_route_list(struct route_list *rl)
{
gc_free(&rl->gc);
CLEAR(*rl);
}
static void
clear_route_ipv6_list(struct route_ipv6_list *rl6)
{
gc_free(&rl6->gc);
CLEAR(*rl6);
}
void
route_list_add_vpn_gateway(struct route_list *rl,
struct env_set *es,
const in_addr_t addr)
{
ASSERT(rl);
rl->spec.remote_endpoint = addr;
rl->spec.flags |= RTSA_REMOTE_ENDPOINT;
setenv_route_addr(es, "vpn_gateway", rl->spec.remote_endpoint, -1);
}
static void
add_block_local_item(struct route_list *rl,
const struct route_gateway_address *gateway,
in_addr_t target)
{
const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED);
if ((rl->rgi.flags & rgi_needed) == rgi_needed
&& rl->rgi.gateway.netmask < 0xFFFFFFFF)
{
struct route_ipv4 *r1, *r2;
unsigned int l2;
ALLOC_OBJ_GC(r1, struct route_ipv4, &rl->gc);
ALLOC_OBJ_GC(r2, struct route_ipv4, &rl->gc);
/* split a route into two smaller blocking routes, and direct them to target */
l2 = ((~gateway->netmask)+1)>>1;
r1->flags = RT_DEFINED;
r1->gateway = target;
r1->network = gateway->addr & gateway->netmask;
r1->netmask = ~(l2-1);
r1->next = rl->routes;
rl->routes = r1;
*r2 = *r1;
r2->network += l2;
r2->next = rl->routes;
rl->routes = r2;
}
}
static void
add_block_local(struct route_list *rl)
{
const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED);
if ((rl->flags & RG_BLOCK_LOCAL)
&& (rl->rgi.flags & rgi_needed) == rgi_needed
&& (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
&& rl->spec.remote_host_local != TLA_LOCAL)
{
size_t i;
#ifndef TARGET_ANDROID
/* add bypass for gateway addr */
add_bypass_address(&rl->spec.bypass, rl->rgi.gateway.addr);
#endif
/* block access to local subnet */
add_block_local_item(rl, &rl->rgi.gateway, rl->spec.remote_endpoint);
/* process additional subnets on gateway interface */
for (i = 0; i < rl->rgi.n_addrs; ++i)
{
const struct route_gateway_address *gwa = &rl->rgi.addrs[i];
/* omit the add/subnet in &rl->rgi which we processed above */
if (!((rl->rgi.gateway.addr & rl->rgi.gateway.netmask) == (gwa->addr & gwa->netmask)
&& rl->rgi.gateway.netmask == gwa->netmask))
{
add_block_local_item(rl, gwa, rl->spec.remote_endpoint);
}
}
}
}
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)
{
struct gc_arena gc = gc_new();
bool ret = true;
clear_route_list(rl);
rl->flags = opt->flags;
if (remote_host)
{
rl->spec.remote_host = remote_host;
rl->spec.flags |= RTSA_REMOTE_HOST;
}
if (default_metric)
{
rl->spec.default_metric = default_metric;
rl->spec.flags |= RTSA_DEFAULT_METRIC;
}
get_default_gateway(&rl->rgi);
if (rl->rgi.flags & RGI_ADDR_DEFINED)
{
setenv_route_addr(es, "net_gateway", rl->rgi.gateway.addr, -1);
#if defined(ENABLE_DEBUG) && !defined(ENABLE_SMALL)
print_default_gateway(D_ROUTE, &rl->rgi, NULL);
#endif
}
else
{
dmsg(D_ROUTE, "ROUTE: default_gateway=UNDEF");
}
if (rl->spec.flags & RTSA_REMOTE_HOST)
{
rl->spec.remote_host_local = test_local_addr(remote_host, &rl->rgi);
}
if (is_route_parm_defined(remote_endpoint))
{
bool defined = false;
rl->spec.remote_endpoint = getaddr(
GETADDR_RESOLVE
| GETADDR_HOST_ORDER
| GETADDR_WARN_ON_SIGNAL,
remote_endpoint,
0,
&defined,
NULL);
if (defined)
{
setenv_route_addr(es, "vpn_gateway", rl->spec.remote_endpoint, -1);
rl->spec.flags |= RTSA_REMOTE_ENDPOINT;
}
else
{
msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve default gateway: %s",
remote_endpoint);
ret = false;
}
}
if (rl->flags & RG_ENABLE)
{
add_block_local(rl);
get_bypass_addresses(&rl->spec.bypass, rl->flags);
#ifdef ENABLE_DEBUG
print_bypass_addresses(&rl->spec.bypass);
#endif
}
/* parse the routes from opt to rl */
{
struct route_option *ro;
for (ro = opt->routes; ro; ro = ro->next)
{
struct addrinfo *netlist = NULL;
struct route_ipv4 r;
if (!init_route(&r, &netlist, ro, rl))
{
ret = false;
}
else
{
struct addrinfo *curele;
for (curele = netlist; curele; curele = curele->ai_next)
{
struct route_ipv4 *new;
ALLOC_OBJ_GC(new, struct route_ipv4, &rl->gc);
*new = r;
new->network = ntohl(((struct sockaddr_in *)curele->ai_addr)->sin_addr.s_addr);
new->next = rl->routes;
rl->routes = new;
}
}
if (netlist)
{
gc_addspecial(netlist, &gc_freeaddrinfo_callback, &gc);
}
}
}
gc_free(&gc);
return ret;
}
/* check whether an IPv6 host address is covered by a given route_ipv6
* (not the most beautiful implementation in the world, but portable and
* "good enough")
*/
static bool
route_ipv6_match_host( const struct route_ipv6 *r6,
const struct in6_addr *host )
{
unsigned int bits = r6->netbits;
int i;
unsigned int mask;
if (bits>128)
{
return false;
}
for (i = 0; bits >= 8; i++, bits -= 8)
{
if (r6->network.s6_addr[i] != host->s6_addr[i])
{
return false;
}
}
if (bits == 0)
{
return true;
}
mask = 0xff << (8-bits);
if ( (r6->network.s6_addr[i] & mask) == (host->s6_addr[i] & mask ))
{
return true;
}
return false;
}
bool
init_route_ipv6_list(struct route_ipv6_list *rl6,
const struct route_ipv6_option_list *opt6,
const char *remote_endpoint,
int default_metric,
const struct in6_addr *remote_host_ipv6,
struct env_set *es)
{
struct gc_arena gc = gc_new();
bool ret = true;
bool need_remote_ipv6_route;
clear_route_ipv6_list(rl6);
rl6->flags = opt6->flags;
if (remote_host_ipv6)
{
rl6->remote_host_ipv6 = *remote_host_ipv6;
rl6->spec_flags |= RTSA_REMOTE_HOST;
}
if (default_metric >= 0)
{
rl6->default_metric = default_metric;
rl6->spec_flags |= RTSA_DEFAULT_METRIC;
}
msg(D_ROUTE, "GDG6: remote_host_ipv6=%s",
remote_host_ipv6 ? print_in6_addr(*remote_host_ipv6, 0, &gc) : "n/a" );
get_default_gateway_ipv6(&rl6->rgi6, remote_host_ipv6);
if (rl6->rgi6.flags & RGI_ADDR_DEFINED)
{
setenv_str(es, "net_gateway_ipv6", print_in6_addr(rl6->rgi6.gateway.addr_ipv6, 0, &gc));
#if defined(ENABLE_DEBUG) && !defined(ENABLE_SMALL)
print_default_gateway(D_ROUTE, NULL, &rl6->rgi6);
#endif
}
else
{
dmsg(D_ROUTE, "ROUTE6: default_gateway=UNDEF");
}
if (is_route_parm_defined( remote_endpoint ))
{
if (inet_pton( AF_INET6, remote_endpoint,
&rl6->remote_endpoint_ipv6) == 1)
{
rl6->spec_flags |= RTSA_REMOTE_ENDPOINT;
}
else
{
msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve VPN endpoint: %s", remote_endpoint);
ret = false;
}
}
/* parse the routes from opt6 to rl6
* discovering potential overlaps with remote_host_ipv6 in the process
*/
need_remote_ipv6_route = false;
{
struct route_ipv6_option *ro6;
for (ro6 = opt6->routes_ipv6; ro6; ro6 = ro6->next)
{
struct route_ipv6 *r6;
ALLOC_OBJ_GC(r6, struct route_ipv6, &rl6->gc);
if (!init_route_ipv6(r6, ro6, rl6))
{
ret = false;
}
else
{
r6->next = rl6->routes_ipv6;
rl6->routes_ipv6 = r6;
#ifndef TARGET_ANDROID
/* On Android the VPNService protect function call will take of
* avoiding routing loops, so ignore this part and let
* need_remote_ipv6_route always evaluate to false
*/
if (remote_host_ipv6
&& route_ipv6_match_host( r6, remote_host_ipv6 ) )
{
need_remote_ipv6_route = true;
msg(D_ROUTE, "ROUTE6: %s/%d overlaps IPv6 remote %s, adding host route to VPN endpoint",
print_in6_addr(r6->network, 0, &gc), r6->netbits,
print_in6_addr(*remote_host_ipv6, 0, &gc));
}
#endif
}
}
}
/* add VPN server host route if needed */
if (need_remote_ipv6_route)
{
if ( (rl6->rgi6.flags & (RGI_ADDR_DEFINED|RGI_IFACE_DEFINED) ) ==
(RGI_ADDR_DEFINED|RGI_IFACE_DEFINED) )
{
struct route_ipv6 *r6;
ALLOC_OBJ_CLEAR_GC(r6, struct route_ipv6, &rl6->gc);
r6->network = *remote_host_ipv6;
r6->netbits = 128;
if (!(rl6->rgi6.flags & RGI_ON_LINK) )
{
r6->gateway = rl6->rgi6.gateway.addr_ipv6;
}
r6->metric = 1;
#ifdef _WIN32
r6->adapter_index = rl6->rgi6.adapter_index;
#else
r6->iface = rl6->rgi6.iface;
#endif
r6->flags = RT_DEFINED | RT_METRIC_DEFINED;
r6->next = rl6->routes_ipv6;
rl6->routes_ipv6 = r6;
}
else
{
msg(M_WARN, "ROUTE6: IPv6 route overlaps with IPv6 remote address, but could not determine IPv6 gateway address + interface, expect failure\n" );
}
}
gc_free(&gc);
return ret;
}
static void
add_route3(in_addr_t network,
in_addr_t netmask,
in_addr_t gateway,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi,
const struct env_set *es)
{
struct route_ipv4 r;
CLEAR(r);
r.flags = RT_DEFINED;
r.network = network;
r.netmask = netmask;
r.gateway = gateway;
add_route(&r, tt, flags, rgi, es);
}
static void
del_route3(in_addr_t network,
in_addr_t netmask,
in_addr_t gateway,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi,
const struct env_set *es)
{
struct route_ipv4 r;
CLEAR(r);
r.flags = RT_DEFINED|RT_ADDED;
r.network = network;
r.netmask = netmask;
r.gateway = gateway;
delete_route(&r, tt, flags, rgi, es);
}
static void
add_bypass_routes(struct route_bypass *rb,
in_addr_t gateway,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi,
const struct env_set *es)
{
int i;
for (i = 0; i < rb->n_bypass; ++i)
{
if (rb->bypass[i])
{
add_route3(rb->bypass[i],
IPV4_NETMASK_HOST,
gateway,
tt,
flags | ROUTE_REF_GW,
rgi,
es);
}
}
}
static void
del_bypass_routes(struct route_bypass *rb,
in_addr_t gateway,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi,
const struct env_set *es)
{
int i;
for (i = 0; i < rb->n_bypass; ++i)
{
if (rb->bypass[i])
{
del_route3(rb->bypass[i],
IPV4_NETMASK_HOST,
gateway,
tt,
flags | ROUTE_REF_GW,
rgi,
es);
}
}
}
static void
redirect_default_route_to_vpn(struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
const char err[] = "NOTE: unable to redirect default gateway --";
if (rl && rl->flags & RG_ENABLE)
{
bool local = rl->flags & RG_LOCAL;
if (!(rl->spec.flags & RTSA_REMOTE_ENDPOINT) && (rl->flags & RG_REROUTE_GW))
{
msg(M_WARN, "%s VPN gateway parameter (--route-gateway or --ifconfig) is missing", err);
}
/*
* check if a default route is defined, unless:
* - we are connecting to a remote host in our network
* - we are connecting to a non-IPv4 remote host (i.e. we use IPv6)
*/
else if (!(rl->rgi.flags & RGI_ADDR_DEFINED) && !local
&& (rl->spec.remote_host != IPV4_INVALID_ADDR))
{
msg(M_WARN, "%s Cannot read current default gateway from system", err);
}
else if (!(rl->spec.flags & RTSA_REMOTE_HOST))
{
msg(M_WARN, "%s Cannot obtain current remote host address", err);
}
else
{
#ifndef TARGET_ANDROID
if (rl->flags & RG_AUTO_LOCAL)
{
const int tla = rl->spec.remote_host_local;
if (tla == TLA_NONLOCAL)
{
dmsg(D_ROUTE, "ROUTE remote_host is NOT LOCAL");
local = false;
}
else if (tla == TLA_LOCAL)
{
dmsg(D_ROUTE, "ROUTE remote_host is LOCAL");
local = true;
}
}
if (!local)
{
/* route remote host to original default gateway */
/* if remote_host is not ipv4 (ie: ipv6), just skip
* adding this special /32 route */
if (rl->spec.remote_host != IPV4_INVALID_ADDR)
{
add_route3(rl->spec.remote_host,
IPV4_NETMASK_HOST,
rl->rgi.gateway.addr,
tt,
flags | ROUTE_REF_GW,
&rl->rgi,
es);
rl->iflags |= RL_DID_LOCAL;
}
else
{
dmsg(D_ROUTE, "ROUTE remote_host protocol differs from tunneled");
}
}
#endif /* ifndef TARGET_ANDROID */
/* route DHCP/DNS server traffic through original default gateway */
add_bypass_routes(&rl->spec.bypass, rl->rgi.gateway.addr, tt, flags, &rl->rgi, es);
if (rl->flags & RG_REROUTE_GW)
{
if (rl->flags & RG_DEF1)
{
/* add new default route (1st component) */
add_route3(0x00000000,
0x80000000,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
/* add new default route (2nd component) */
add_route3(0x80000000,
0x80000000,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
}
else
{
/* don't try to remove the def route if it does not exist */
if (rl->rgi.flags & RGI_ADDR_DEFINED)
{
/* delete default route */
del_route3(0, 0, rl->rgi.gateway.addr, tt,
flags | ROUTE_REF_GW, &rl->rgi, es);
}
/* add new default route */
add_route3(0,
0,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
}
}
/* set a flag so we can undo later */
rl->iflags |= RL_DID_REDIRECT_DEFAULT_GATEWAY;
}
}
}
static void
undo_redirect_default_route_to_vpn(struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
if (rl && rl->iflags & RL_DID_REDIRECT_DEFAULT_GATEWAY)
{
/* delete remote host route */
if (rl->iflags & RL_DID_LOCAL)
{
del_route3(rl->spec.remote_host,
IPV4_NETMASK_HOST,
rl->rgi.gateway.addr,
tt,
flags | ROUTE_REF_GW,
&rl->rgi,
es);
rl->iflags &= ~RL_DID_LOCAL;
}
/* delete special DHCP/DNS bypass route */
del_bypass_routes(&rl->spec.bypass, rl->rgi.gateway.addr, tt, flags, &rl->rgi, es);
if (rl->flags & RG_REROUTE_GW)
{
if (rl->flags & RG_DEF1)
{
/* delete default route (1st component) */
del_route3(0x00000000,
0x80000000,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
/* delete default route (2nd component) */
del_route3(0x80000000,
0x80000000,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
}
else
{
/* delete default route */
del_route3(0,
0,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
/* restore original default route if there was any */
if (rl->rgi.flags & RGI_ADDR_DEFINED)
{
add_route3(0, 0, rl->rgi.gateway.addr, tt,
flags | ROUTE_REF_GW, &rl->rgi, es);
}
}
}
rl->iflags &= ~RL_DID_REDIRECT_DEFAULT_GATEWAY;
}
}
void
add_routes(struct route_list *rl, struct route_ipv6_list *rl6, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
redirect_default_route_to_vpn(rl, tt, flags, es);
if (rl && !(rl->iflags & RL_ROUTES_ADDED) )
{
struct route_ipv4 *r;
#ifdef ENABLE_MANAGEMENT
if (management && rl->routes)
{
management_set_state(management,
OPENVPN_STATE_ADD_ROUTES,
NULL,
NULL,
NULL,
NULL,
NULL);
}
#endif
for (r = rl->routes; r; r = r->next)
{
check_subnet_conflict(r->network, r->netmask, "route");
if (flags & ROUTE_DELETE_FIRST)
{
delete_route(r, tt, flags, &rl->rgi, es);
}
add_route(r, tt, flags, &rl->rgi, es);
}
rl->iflags |= RL_ROUTES_ADDED;
}
if (rl6 && !(rl6->iflags & RL_ROUTES_ADDED) )
{
struct route_ipv6 *r;
if (!tt->did_ifconfig_ipv6_setup)
{
msg(M_INFO, "WARNING: OpenVPN was configured to add an IPv6 "
"route over %s. However, no IPv6 has been configured for "
"this interface, therefore the route installation may "
"fail or may not work as expected.", tt->actual_name);
}
for (r = rl6->routes_ipv6; r; r = r->next)
{
if (flags & ROUTE_DELETE_FIRST)
{
delete_route_ipv6(r, tt, flags, es);
}
add_route_ipv6(r, tt, flags, es);
}
rl6->iflags |= RL_ROUTES_ADDED;
}
}
void
delete_routes(struct route_list *rl, struct route_ipv6_list *rl6,
const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
if (rl && rl->iflags & RL_ROUTES_ADDED)
{
struct route_ipv4 *r;
for (r = rl->routes; r; r = r->next)
{
delete_route(r, tt, flags, &rl->rgi, es);
}
rl->iflags &= ~RL_ROUTES_ADDED;
}
undo_redirect_default_route_to_vpn(rl, tt, flags, es);
if (rl)
{
clear_route_list(rl);
}
if (rl6 && (rl6->iflags & RL_ROUTES_ADDED) )
{
struct route_ipv6 *r6;
for (r6 = rl6->routes_ipv6; r6; r6 = r6->next)
{
delete_route_ipv6(r6, tt, flags, es);
}
rl6->iflags &= ~RL_ROUTES_ADDED;
}
if (rl6)
{
clear_route_ipv6_list(rl6);
}
}
#ifndef ENABLE_SMALL
static const char *
show_opt(const char *option)
{
if (!option)
{
return "default (not set)";
}
else
{
return option;
}
}
static void
print_route_option(const struct route_option *ro, int level)
{
msg(level, " route %s/%s/%s/%s",
show_opt(ro->network),
show_opt(ro->netmask),
show_opt(ro->gateway),
show_opt(ro->metric));
}
void
print_route_options(const struct route_option_list *rol,
int level)
{
struct route_option *ro;
if (rol->flags & RG_ENABLE)
{
msg(level, " [redirect_default_gateway local=%d]",
(rol->flags & RG_LOCAL) != 0);
}
for (ro = rol->routes; ro; ro = ro->next)
{
print_route_option(ro, level);
}
}
void
print_default_gateway(const int msglevel,
const struct route_gateway_info *rgi,
const struct route_ipv6_gateway_info *rgi6)
{
struct gc_arena gc = gc_new();
if (rgi && (rgi->flags & RGI_ADDR_DEFINED))
{
struct buffer out = alloc_buf_gc(256, &gc);
buf_printf(&out, "ROUTE_GATEWAY");
if (rgi->flags & RGI_ON_LINK)
{
buf_printf(&out, " ON_LINK");
}
else
{
buf_printf(&out, " %s", print_in_addr_t(rgi->gateway.addr, 0, &gc));
}
if (rgi->flags & RGI_NETMASK_DEFINED)
{
buf_printf(&out, "/%s", print_in_addr_t(rgi->gateway.netmask, 0, &gc));
}
#ifdef _WIN32
if (rgi->flags & RGI_IFACE_DEFINED)
{
buf_printf(&out, " I=%lu", rgi->adapter_index);
}
#else
if (rgi->flags & RGI_IFACE_DEFINED)
{
buf_printf(&out, " IFACE=%s", rgi->iface);
}
#endif
if (rgi->flags & RGI_HWADDR_DEFINED)
{
buf_printf(&out, " HWADDR=%s", format_hex_ex(rgi->hwaddr, 6, 0, 1, ":", &gc));
}
msg(msglevel, "%s", BSTR(&out));
}
if (rgi6 && (rgi6->flags & RGI_ADDR_DEFINED))
{
struct buffer out = alloc_buf_gc(256, &gc);
buf_printf(&out, "ROUTE6_GATEWAY");
buf_printf(&out, " %s", print_in6_addr(rgi6->gateway.addr_ipv6, 0, &gc));
if (rgi6->flags & RGI_ON_LINK)
{
buf_printf(&out, " ON_LINK");
}
if (rgi6->flags & RGI_NETMASK_DEFINED)
{
buf_printf(&out, "/%d", rgi6->gateway.netbits_ipv6);
}
#ifdef _WIN32
if (rgi6->flags & RGI_IFACE_DEFINED)
{
buf_printf(&out, " I=%lu", rgi6->adapter_index);
}
#else
if (rgi6->flags & RGI_IFACE_DEFINED)
{
buf_printf(&out, " IFACE=%s", rgi6->iface);
}
#endif
if (rgi6->flags & RGI_HWADDR_DEFINED)
{
buf_printf(&out, " HWADDR=%s", format_hex_ex(rgi6->hwaddr, 6, 0, 1, ":", &gc));
}
msg(msglevel, "%s", BSTR(&out));
}
gc_free(&gc);
}
#endif /* ifndef ENABLE_SMALL */
static void
print_route(const struct route_ipv4 *r, int level)
{
struct gc_arena gc = gc_new();
if (r->flags & RT_DEFINED)
{
msg(level, "%s", route_string(r, &gc));
}
gc_free(&gc);
}
void
print_routes(const struct route_list *rl, int level)
{
struct route_ipv4 *r;
for (r = rl->routes; r; r = r->next)
{
print_route(r, level);
}
}
static void
setenv_route(struct env_set *es, const struct route_ipv4 *r, int i)
{
struct gc_arena gc = gc_new();
if (r->flags & RT_DEFINED)
{
setenv_route_addr(es, "network", r->network, i);
setenv_route_addr(es, "netmask", r->netmask, i);
setenv_route_addr(es, "gateway", r->gateway, i);
if (r->flags & RT_METRIC_DEFINED)
{
struct buffer name = alloc_buf_gc(256, &gc);
buf_printf(&name, "route_metric_%d", i);
setenv_int(es, BSTR(&name), r->metric);
}
}
gc_free(&gc);
}
void
setenv_routes(struct env_set *es, const struct route_list *rl)
{
int i = 1;
struct route_ipv4 *r;
for (r = rl->routes; r; r = r->next)
{
setenv_route(es, r, i++);
}
}
static void
setenv_route_ipv6(struct env_set *es, const struct route_ipv6 *r6, int i)
{
struct gc_arena gc = gc_new();
if (r6->flags & RT_DEFINED)
{
struct buffer name1 = alloc_buf_gc( 256, &gc );
struct buffer val = alloc_buf_gc( 256, &gc );
struct buffer name2 = alloc_buf_gc( 256, &gc );
buf_printf( &name1, "route_ipv6_network_%d", i );
buf_printf( &val, "%s/%d", print_in6_addr( r6->network, 0, &gc ),
r6->netbits );
setenv_str( es, BSTR(&name1), BSTR(&val) );
buf_printf( &name2, "route_ipv6_gateway_%d", i );
setenv_str( es, BSTR(&name2), print_in6_addr( r6->gateway, 0, &gc ));
}
gc_free(&gc);
}
void
setenv_routes_ipv6(struct env_set *es, const struct route_ipv6_list *rl6)
{
int i = 1;
struct route_ipv6 *r6;
for (r6 = rl6->routes_ipv6; r6; r6 = r6->next)
{
setenv_route_ipv6(es, r6, i++);
}
}
/*
* local_route() determines whether the gateway of a provided host
* route is on the same interface that owns the default gateway.
* It uses the data structure
* returned by get_default_gateway() (struct route_gateway_info)
* to determine this. If the route is local, LR_MATCH is returned.
* When adding routes into the kernel, if LR_MATCH is defined for
* a given route, the route should explicitly reference the default
* gateway interface as the route destination. For example, here
* is an example on Linux that uses LR_MATCH:
*
* route add -net 10.10.0.1 netmask 255.255.255.255 dev eth0
*
* This capability is needed by the "default-gateway block-local"
* directive, to allow client access to the local subnet to be
* blocked but still allow access to the local default gateway.
*/
/* local_route() return values */
#define LR_NOMATCH 0 /* route is not local */
#define LR_MATCH 1 /* route is local */
#define LR_ERROR 2 /* caller should abort adding route */
static int
local_route(in_addr_t network,
in_addr_t netmask,
in_addr_t gateway,
const struct route_gateway_info *rgi)
{
/* set LR_MATCH on local host routes */
const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED|RGI_IFACE_DEFINED);
if (rgi
&& (rgi->flags & rgi_needed) == rgi_needed
&& gateway == rgi->gateway.addr
&& netmask == 0xFFFFFFFF)
{
if (((network ^ rgi->gateway.addr) & rgi->gateway.netmask) == 0)
{
return LR_MATCH;
}
else
{
/* examine additional subnets on gateway interface */
size_t i;
for (i = 0; i < rgi->n_addrs; ++i)
{
const struct route_gateway_address *gwa = &rgi->addrs[i];
if (((network ^ gwa->addr) & gwa->netmask) == 0)
{
return LR_MATCH;
}
}
}
}
return LR_NOMATCH;
}
/* Return true if the "on-link" form of the route should be used. This is when the gateway for a
* a route is specified as an interface rather than an address. */
static inline bool
is_on_link(const int is_local_route, const unsigned int flags, const struct route_gateway_info *rgi)
{
return rgi && (is_local_route == LR_MATCH || ((flags & ROUTE_REF_GW) && (rgi->flags & RGI_ON_LINK)));
}
void
add_route(struct route_ipv4 *r,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi, /* may be NULL */
const struct env_set *es)
{
struct gc_arena gc;
struct argv argv = argv_new();
const char *network;
#if !defined(ENABLE_IPROUTE) && !defined(TARGET_AIX)
const char *netmask;
#endif
const char *gateway;
bool status = false;
int is_local_route;
if (!(r->flags & RT_DEFINED))
{
return;
}
gc_init(&gc);
network = print_in_addr_t(r->network, 0, &gc);
#if !defined(ENABLE_IPROUTE) && !defined(TARGET_AIX)
netmask = print_in_addr_t(r->netmask, 0, &gc);
#endif
gateway = print_in_addr_t(r->gateway, 0, &gc);
is_local_route = local_route(r->network, r->netmask, r->gateway, rgi);
if (is_local_route == LR_ERROR)
{
goto done;
}
#if defined(TARGET_LINUX)
#ifdef ENABLE_IPROUTE
argv_printf(&argv, "%s route add %s/%d",
iproute_path,
network,
netmask_to_netbits2(r->netmask));
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "metric %d", r->metric);
}
if (is_on_link(is_local_route, flags, rgi))
{
argv_printf_cat(&argv, "dev %s", rgi->iface);
}
else
{
argv_printf_cat(&argv, "via %s", gateway);
}
#else /* ifdef ENABLE_IPROUTE */
argv_printf(&argv, "%s add -net %s netmask %s",
ROUTE_PATH,
network,
netmask);
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "metric %d", r->metric);
}
if (is_on_link(is_local_route, flags, rgi))
{
argv_printf_cat(&argv, "dev %s", rgi->iface);
}
else
{
argv_printf_cat(&argv, "gw %s", gateway);
}
#endif /*ENABLE_IPROUTE*/
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: Linux route add command failed");
#elif defined (TARGET_ANDROID)
char out[128];
if (rgi)
{
openvpn_snprintf(out, sizeof(out), "%s %s %s dev %s", network, netmask, gateway, rgi->iface);
}
else
{
openvpn_snprintf(out, sizeof(out), "%s %s %s", network, netmask, gateway);
}
management_android_control(management, "ROUTE", out);
#elif defined (_WIN32)
{
DWORD ai = TUN_ADAPTER_INDEX_INVALID;
argv_printf(&argv, "%s%sc ADD %s MASK %s %s",
get_win_sys_path(),
WIN_ROUTE_PATH_SUFFIX,
network,
netmask,
gateway);
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "METRIC %d", r->metric);
}
if (is_on_link(is_local_route, flags, rgi))
{
ai = rgi->adapter_index;
argv_printf_cat(&argv, "IF %lu", ai);
}
argv_msg(D_ROUTE, &argv);
if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_SERVICE)
{
status = add_route_service(r, tt);
msg(D_ROUTE, "Route addition via service %s", status ? "succeeded" : "failed");
}
else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI)
{
status = add_route_ipapi(r, tt, ai);
msg(D_ROUTE, "Route addition via IPAPI %s", status ? "succeeded" : "failed");
}
else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE)
{
netcmd_semaphore_lock();
status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add command failed");
netcmd_semaphore_release();
}
else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE)
{
status = add_route_ipapi(r, tt, ai);
msg(D_ROUTE, "Route addition via IPAPI %s [adaptive]", status ? "succeeded" : "failed");
if (!status)
{
msg(D_ROUTE, "Route addition fallback to route.exe");
netcmd_semaphore_lock();
status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add command failed [adaptive]");
netcmd_semaphore_release();
}
}
else
{
ASSERT(0);
}
}
#elif defined (TARGET_SOLARIS)
/* example: route add 192.0.2.32 -netmask 255.255.255.224 somegateway */
argv_printf(&argv, "%s add",
ROUTE_PATH);
argv_printf_cat(&argv, "%s -netmask %s %s",
network,
netmask,
gateway);
/* Solaris can only distinguish between "metric 0" == "on-link on the
* interface where the IP address given is configured" and "metric > 0"
* == "use gateway specified" (no finer-grained route metrics available)
*
* More recent versions of Solaris can also do "-interface", but that
* would break backwards compatibility with older versions for no gain.
*/
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "%d", r->metric);
}
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route add command failed");
#elif defined(TARGET_FREEBSD)
argv_printf(&argv, "%s add",
ROUTE_PATH);
#if 0
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "-rtt %d", r->metric);
}
#endif
argv_printf_cat(&argv, "-net %s %s %s",
network,
gateway,
netmask);
/* FIXME -- add on-link support for FreeBSD */
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: FreeBSD route add command failed");
#elif defined(TARGET_DRAGONFLY)
argv_printf(&argv, "%s add",
ROUTE_PATH);
#if 0
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "-rtt %d", r->metric);
}
#endif
argv_printf_cat(&argv, "-net %s %s %s",
network,
gateway,
netmask);
/* FIXME -- add on-link support for Dragonfly */
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: DragonFly route add command failed");
#elif defined(TARGET_DARWIN)
argv_printf(&argv, "%s add",
ROUTE_PATH);
#if 0
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "-rtt %d", r->metric);
}
#endif
if (is_on_link(is_local_route, flags, rgi))
{
/* Mac OS X route syntax for ON_LINK:
* route add -cloning -net 10.10.0.1 -netmask 255.255.255.255 -interface en0 */
argv_printf_cat(&argv, "-cloning -net %s -netmask %s -interface %s",
network,
netmask,
rgi->iface);
}
else
{
argv_printf_cat(&argv, "-net %s %s %s",
network,
gateway,
netmask);
}
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: OS X route add command failed");
#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
argv_printf(&argv, "%s add",
ROUTE_PATH);
#if 0
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "-rtt %d", r->metric);
}
#endif
argv_printf_cat(&argv, "-net %s %s -netmask %s",
network,
gateway,
netmask);
/* FIXME -- add on-link support for OpenBSD/NetBSD */
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 /* if defined(TARGET_LINUX) */
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 /* if defined(TARGET_LINUX) */
done:
if (status)
{
r->flags |= RT_ADDED;
}
else
{
r->flags &= ~RT_ADDED;
}
argv_reset(&argv);
gc_free(&gc);
}
void
route_ipv6_clear_host_bits( struct route_ipv6 *r6 )
{
/* clear host bit parts of route
* (needed if routes are specified improperly, or if we need to
* explicitely setup/clear the "connected" network routes on some OSes)
*/
int byte = 15;
int bits_to_clear = 128 - r6->netbits;
while (byte >= 0 && bits_to_clear > 0)
{
if (bits_to_clear >= 8)
{
r6->network.s6_addr[byte--] = 0; bits_to_clear -= 8;
}
else
{
r6->network.s6_addr[byte--] &= (0xff << bits_to_clear); bits_to_clear = 0;
}
}
}
void
add_route_ipv6(struct route_ipv6 *r6, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
struct gc_arena gc;
struct argv argv = argv_new();
const char *network;
const char *gateway;
bool status = false;
const char *device = tt->actual_name;
bool gateway_needed = false;
if (!(r6->flags & RT_DEFINED) )
{
return;
}
#ifndef _WIN32
if (r6->iface != NULL) /* vpn server special route */
{
device = r6->iface;
if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) )
{
gateway_needed = true;
}
}
#endif
gc_init(&gc);
route_ipv6_clear_host_bits(r6);
network = print_in6_addr( r6->network, 0, &gc);
gateway = print_in6_addr( r6->gateway, 0, &gc);
#if defined(TARGET_DARWIN) \
|| defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \
|| defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
/* the BSD platforms cannot specify gateway and interface independently,
* but for link-local destinations, we MUST specify the interface, so
* we build a combined "$gateway%$interface" gateway string
*/
if (r6->iface != NULL && gateway_needed
&& IN6_IS_ADDR_LINKLOCAL(&r6->gateway) ) /* fe80::...%intf */
{
int len = strlen(gateway) + 1 + strlen(r6->iface)+1;
char *tmp = gc_malloc( len, true, &gc );
snprintf( tmp, len, "%s%%%s", gateway, r6->iface );
gateway = tmp;
}
#endif
msg( M_INFO, "add_route_ipv6(%s/%d -> %s metric %d) dev %s",
network, r6->netbits, gateway, r6->metric, device );
/*
* Filter out routes which are essentially no-ops
* (not currently done for IPv6)
*/
/* On "tun" interface, we never set a gateway if the operating system
* can do "route to interface" - it does not add value, as the target
* dev already fully qualifies the route destination on point-to-point
* interfaces. OTOH, on "tap" interface, we must always set the
* gateway unless the route is to be an on-link network
*/
if (tt->type == DEV_TYPE_TAP
&& !( (r6->flags & RT_METRIC_DEFINED) && r6->metric == 0 ) )
{
gateway_needed = true;
}
#if defined(TARGET_LINUX)
#ifdef ENABLE_IPROUTE
argv_printf(&argv, "%s -6 route add %s/%d dev %s",
iproute_path,
network,
r6->netbits,
device);
if (gateway_needed)
{
argv_printf_cat(&argv, "via %s", gateway);
}
if ( (r6->flags & RT_METRIC_DEFINED) && r6->metric > 0)
{
argv_printf_cat(&argv, " metric %d", r6->metric);
}
#else /* ifdef ENABLE_IPROUTE */
argv_printf(&argv, "%s -A inet6 add %s/%d dev %s",
ROUTE_PATH,
network,
r6->netbits,
device);
if (gateway_needed)
{
argv_printf_cat(&argv, "gw %s", gateway);
}
if ( (r6->flags & RT_METRIC_DEFINED) && r6->metric > 0)
{
argv_printf_cat(&argv, " metric %d", r6->metric);
}
#endif /*ENABLE_IPROUTE*/
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: Linux route -6/-A inet6 add command failed");
#elif defined (TARGET_ANDROID)
char out[64];
openvpn_snprintf(out, sizeof(out), "%s/%d %s", network, r6->netbits, device);
management_android_control(management, "ROUTE6", out);
#elif defined (_WIN32)
if (tt->options.msg_channel)
{
status = add_route_ipv6_service(r6, tt);
}
else
{
struct buffer out = alloc_buf_gc(64, &gc);
if (r6->adapter_index) /* vpn server special route */
{
buf_printf(&out, "interface=%lu", r6->adapter_index );
gateway_needed = true;
}
else
{
buf_printf(&out, "interface=%lu", tt->adapter_index );
}
device = buf_bptr(&out);
/* netsh interface ipv6 add route 2001:db8::/32 MyTunDevice */
argv_printf(&argv, "%s%sc interface ipv6 add route %s/%d %s",
get_win_sys_path(),
NETSH_PATH_SUFFIX,
network,
r6->netbits,
device);
/* next-hop depends on TUN or TAP mode:
* - in TAP mode, we use the "real" next-hop
* - in TUN mode we use a special-case link-local address that the tapdrvr
* knows about and will answer ND (neighbor discovery) packets for
*/
if (tt->type == DEV_TYPE_TUN && !gateway_needed)
{
argv_printf_cat( &argv, " %s", "fe80::8" );
}
else if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) )
{
argv_printf_cat( &argv, " %s", gateway );
}
#if 0
if (r6->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, " METRIC %d", r->metric);
}
#endif
/* in some versions of Windows, routes are persistent across reboots by
* default, unless "store=active" is set (pointed out by Tony Lim, thanks)
*/
argv_printf_cat( &argv, " store=active" );
argv_msg(D_ROUTE, &argv);
netcmd_semaphore_lock();
status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add ipv6 command failed");
netcmd_semaphore_release();
}
#elif defined (TARGET_SOLARIS)
/* example: route add -inet6 2001:db8::/32 somegateway 0 */
/* for some reason, routes to tun/tap do not work for me unless I set
* "metric 0" - otherwise, the routes will be nicely installed, but
* packets will just disappear somewhere. So we always use "0" now,
* unless the route points to "gateway on other interface"...
*
* (Note: OpenSolaris can not specify host%interface gateways, so we just
* use the GW addresses - it seems to still work for fe80:: addresses,
* however this is done internally. NUD maybe?)
*/
argv_printf(&argv, "%s add -inet6 %s/%d %s",
ROUTE_PATH,
network,
r6->netbits,
gateway );
/* on tun/tap, not "elsewhere"? -> metric 0 */
if (!r6->iface)
{
argv_printf_cat(&argv, "0");
}
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route add -inet6 command failed");
#elif defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY)
argv_printf(&argv, "%s add -inet6 %s/%d",
ROUTE_PATH,
network,
r6->netbits);
if (gateway_needed)
{
argv_printf_cat(&argv, "%s", gateway);
}
else
{
argv_printf_cat(&argv, "-iface %s", device);
}
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: *BSD route add -inet6 command failed");
#elif defined(TARGET_DARWIN)
argv_printf(&argv, "%s add -inet6 %s -prefixlen %d",
ROUTE_PATH,
network, r6->netbits );
if (gateway_needed)
{
argv_printf_cat(&argv, "%s", gateway);
}
else
{
argv_printf_cat(&argv, "-iface %s", device);
}
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: MacOS X route add -inet6 command failed");
#elif defined(TARGET_OPENBSD)
argv_printf(&argv, "%s add -inet6 %s -prefixlen %d %s",
ROUTE_PATH,
network, r6->netbits, gateway );
argv_msg(D_ROUTE, &argv);
status = openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD route add -inet6 command failed");
#elif defined(TARGET_NETBSD)
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: 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 /* if defined(TARGET_LINUX) */
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 /* if defined(TARGET_LINUX) */
if (status)
{
r6->flags |= RT_ADDED;
}
else
{
r6->flags &= ~RT_ADDED;
}
argv_reset(&argv);
gc_free(&gc);
}
static void
delete_route(struct route_ipv4 *r,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi,
const struct env_set *es)
{
struct gc_arena gc;
struct argv argv = argv_new();
const char *network;
#if !defined(ENABLE_IPROUTE) && !defined(TARGET_AIX)
const char *netmask;
#endif
#if !defined(TARGET_LINUX) && !defined(TARGET_ANDROID)
const char *gateway;
#endif
int is_local_route;
if ((r->flags & (RT_DEFINED|RT_ADDED)) != (RT_DEFINED|RT_ADDED))
{
return;
}
gc_init(&gc);
network = print_in_addr_t(r->network, 0, &gc);
#if !defined(ENABLE_IPROUTE) && !defined(TARGET_AIX)
netmask = print_in_addr_t(r->netmask, 0, &gc);
#endif
#if !defined(TARGET_LINUX) && !defined(TARGET_ANDROID)
gateway = print_in_addr_t(r->gateway, 0, &gc);
#endif
is_local_route = local_route(r->network, r->netmask, r->gateway, rgi);
if (is_local_route == LR_ERROR)
{
goto done;
}
#if defined(TARGET_LINUX)
#ifdef ENABLE_IPROUTE
argv_printf(&argv, "%s route del %s/%d",
iproute_path,
network,
netmask_to_netbits2(r->netmask));
#else
argv_printf(&argv, "%s del -net %s netmask %s",
ROUTE_PATH,
network,
netmask);
#endif /*ENABLE_IPROUTE*/
if (r->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "metric %d", r->metric);
}
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: Linux route delete command failed");
#elif defined (_WIN32)
argv_printf(&argv, "%s%sc DELETE %s MASK %s %s",
get_win_sys_path(),
WIN_ROUTE_PATH_SUFFIX,
network,
netmask,
gateway);
argv_msg(D_ROUTE, &argv);
if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_SERVICE)
{
const bool status = del_route_service(r, tt);
msg(D_ROUTE, "Route deletion via service %s", status ? "succeeded" : "failed");
}
else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI)
{
const bool status = del_route_ipapi(r, tt);
msg(D_ROUTE, "Route deletion via IPAPI %s", status ? "succeeded" : "failed");
}
else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE)
{
netcmd_semaphore_lock();
openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete command failed");
netcmd_semaphore_release();
}
else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE)
{
const bool status = del_route_ipapi(r, tt);
msg(D_ROUTE, "Route deletion via IPAPI %s [adaptive]", status ? "succeeded" : "failed");
if (!status)
{
msg(D_ROUTE, "Route deletion fallback to route.exe");
netcmd_semaphore_lock();
openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete command failed [adaptive]");
netcmd_semaphore_release();
}
}
else
{
ASSERT(0);
}
#elif defined (TARGET_SOLARIS)
argv_printf(&argv, "%s delete %s -netmask %s %s",
ROUTE_PATH,
network,
netmask,
gateway);
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route delete command failed");
#elif defined(TARGET_FREEBSD)
argv_printf(&argv, "%s delete -net %s %s %s",
ROUTE_PATH,
network,
gateway,
netmask);
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: FreeBSD route delete command failed");
#elif defined(TARGET_DRAGONFLY)
argv_printf(&argv, "%s delete -net %s %s %s",
ROUTE_PATH,
network,
gateway,
netmask);
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: DragonFly route delete command failed");
#elif defined(TARGET_DARWIN)
if (is_on_link(is_local_route, flags, rgi))
{
argv_printf(&argv, "%s delete -cloning -net %s -netmask %s -interface %s",
ROUTE_PATH,
network,
netmask,
rgi->iface);
}
else
{
argv_printf(&argv, "%s delete -net %s %s %s",
ROUTE_PATH,
network,
gateway,
netmask);
}
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: OS X route delete command failed");
#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
argv_printf(&argv, "%s delete -net %s %s -netmask %s",
ROUTE_PATH,
network,
gateway,
netmask);
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 /* if defined(TARGET_LINUX) */
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 /* if defined(TARGET_LINUX) */
done:
r->flags &= ~RT_ADDED;
argv_reset(&argv);
gc_free(&gc);
}
void
delete_route_ipv6(const struct route_ipv6 *r6, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
struct gc_arena gc;
struct argv argv = argv_new();
const char *network;
const char *gateway;
const char *device = tt->actual_name;
bool gateway_needed = false;
if ((r6->flags & (RT_DEFINED|RT_ADDED)) != (RT_DEFINED|RT_ADDED))
{
return;
}
#ifndef _WIN32
if (r6->iface != NULL) /* vpn server special route */
{
device = r6->iface;
gateway_needed = true;
}
#endif
gc_init(&gc);
network = print_in6_addr( r6->network, 0, &gc);
gateway = print_in6_addr( r6->gateway, 0, &gc);
#if defined(TARGET_DARWIN) \
|| defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \
|| defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
/* the BSD platforms cannot specify gateway and interface independently,
* but for link-local destinations, we MUST specify the interface, so
* we build a combined "$gateway%$interface" gateway string
*/
if (r6->iface != NULL && gateway_needed
&& IN6_IS_ADDR_LINKLOCAL(&r6->gateway) ) /* fe80::...%intf */
{
int len = strlen(gateway) + 1 + strlen(r6->iface)+1;
char *tmp = gc_malloc( len, true, &gc );
snprintf( tmp, len, "%s%%%s", gateway, r6->iface );
gateway = tmp;
}
#endif
msg( M_INFO, "delete_route_ipv6(%s/%d)", network, r6->netbits );
/* if we used a gateway on "add route", we also need to specify it on
* delete, otherwise some OSes will refuse to delete the route
*/
if (tt->type == DEV_TYPE_TAP
&& !( (r6->flags & RT_METRIC_DEFINED) && r6->metric == 0 ) )
{
gateway_needed = true;
}
#if defined(TARGET_LINUX)
#ifdef ENABLE_IPROUTE
argv_printf(&argv, "%s -6 route del %s/%d dev %s",
iproute_path,
network,
r6->netbits,
device);
if (gateway_needed)
{
argv_printf_cat(&argv, "via %s", gateway);
}
#else /* ifdef ENABLE_IPROUTE */
argv_printf(&argv, "%s -A inet6 del %s/%d dev %s",
ROUTE_PATH,
network,
r6->netbits,
device);
if (gateway_needed)
{
argv_printf_cat(&argv, "gw %s", gateway);
}
if ( (r6->flags & RT_METRIC_DEFINED) && r6->metric > 0)
{
argv_printf_cat(&argv, " metric %d", r6->metric);
}
#endif /*ENABLE_IPROUTE*/
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: Linux route -6/-A inet6 del command failed");
#elif defined (_WIN32)
if (tt->options.msg_channel)
{
del_route_ipv6_service(r6, tt);
}
else
{
struct buffer out = alloc_buf_gc(64, &gc);
if (r6->adapter_index) /* vpn server special route */
{
buf_printf(&out, "interface=%lu", r6->adapter_index );
gateway_needed = true;
}
else
{
buf_printf(&out, "interface=%lu", tt->adapter_index );
}
device = buf_bptr(&out);
/* netsh interface ipv6 delete route 2001:db8::/32 MyTunDevice */
argv_printf(&argv, "%s%sc interface ipv6 delete route %s/%d %s",
get_win_sys_path(),
NETSH_PATH_SUFFIX,
network,
r6->netbits,
device);
/* next-hop depends on TUN or TAP mode:
* - in TAP mode, we use the "real" next-hop
* - in TUN mode we use a special-case link-local address that the tapdrvr
* knows about and will answer ND (neighbor discovery) packets for
* (and "route deletion without specifying next-hop" does not work...)
*/
if (tt->type == DEV_TYPE_TUN && !gateway_needed)
{
argv_printf_cat( &argv, " %s", "fe80::8" );
}
else if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) )
{
argv_printf_cat( &argv, " %s", gateway );
}
#if 0
if (r6->flags & RT_METRIC_DEFINED)
{
argv_printf_cat(&argv, "METRIC %d", r->metric);
}
#endif
/* Windows XP to 7 "just delete" routes, wherever they came from, but
* in Windows 8(.1?), if you create them with "store=active", this is
* how you should delete them as well (pointed out by Cedric Tabary)
*/
argv_printf_cat( &argv, " store=active" );
argv_msg(D_ROUTE, &argv);
netcmd_semaphore_lock();
openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete ipv6 command failed");
netcmd_semaphore_release();
}
#elif defined (TARGET_SOLARIS)
/* example: route delete -inet6 2001:db8::/32 somegateway */
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: Solaris route delete -inet6 command failed");
#elif defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY)
argv_printf(&argv, "%s delete -inet6 %s/%d",
ROUTE_PATH,
network,
r6->netbits );
if (gateway_needed)
{
argv_printf_cat(&argv, "%s", gateway);
}
else
{
argv_printf_cat(&argv, "-iface %s", device);
}
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: *BSD route delete -inet6 command failed");
#elif defined(TARGET_DARWIN)
argv_printf(&argv, "%s delete -inet6 %s -prefixlen %d",
ROUTE_PATH,
network, r6->netbits );
if (gateway_needed)
{
argv_printf_cat(&argv, "%s", gateway);
}
else
{
argv_printf_cat(&argv, "-iface %s", device);
}
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: MacOS X route delete -inet6 command failed");
#elif defined(TARGET_OPENBSD)
argv_printf(&argv, "%s delete -inet6 %s -prefixlen %d %s",
ROUTE_PATH,
network, r6->netbits, gateway );
argv_msg(D_ROUTE, &argv);
openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD route delete -inet6 command failed");
#elif defined(TARGET_NETBSD)
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: 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 /* if defined(TARGET_LINUX) */
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 /* if defined(TARGET_LINUX) */
argv_reset(&argv);
gc_free(&gc);
}
/*
* The --redirect-gateway option requires OS-specific code below
* to get the current default gateway.
*/
#if defined(_WIN32)
static const MIB_IPFORWARDTABLE *
get_windows_routing_table(struct gc_arena *gc)
{
ULONG size = 0;
PMIB_IPFORWARDTABLE rt = NULL;
DWORD status;
status = GetIpForwardTable(NULL, &size, TRUE);
if (status == ERROR_INSUFFICIENT_BUFFER)
{
rt = (PMIB_IPFORWARDTABLE) gc_malloc(size, false, gc);
status = GetIpForwardTable(rt, &size, TRUE);
if (status != NO_ERROR)
{
msg(D_ROUTE, "NOTE: GetIpForwardTable returned error: %s (code=%u)",
strerror_win32(status, gc),
(unsigned int)status);
rt = NULL;
}
}
return rt;
}
static int
test_route(const IP_ADAPTER_INFO *adapters,
const in_addr_t gateway,
DWORD *index)
{
int count = 0;
DWORD i = adapter_index_of_ip(adapters, gateway, &count, NULL);
if (index)
{
*index = i;
}
return count;
}
static void
test_route_helper(bool *ret,
int *count,
int *good,
int *ambig,
const IP_ADAPTER_INFO *adapters,
const in_addr_t gateway)
{
int c;
++*count;
c = test_route(adapters, gateway, NULL);
if (c == 0)
{
*ret = false;
}
else
{
++*good;
}
if (c > 1)
{
++*ambig;
}
}
/*
* If we tried to add routes now, would we succeed?
*/
bool
test_routes(const struct route_list *rl, const struct tuntap *tt)
{
struct gc_arena gc = gc_new();
const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc);
bool ret = false;
int count = 0;
int good = 0;
int ambig = 0;
int len = -1;
bool adapter_up = false;
if (is_adapter_up(tt, adapters))
{
ret = true;
adapter_up = true;
/* we do this test only if we have IPv4 routes to install, and if
* the tun/tap interface has seen IPv4 ifconfig - because if we
* have no IPv4, the check will always fail, failing tun init
*/
if (rl && tt->did_ifconfig_setup)
{
struct route_ipv4 *r;
for (r = rl->routes, len = 0; r; r = r->next, ++len)
{
test_route_helper(&ret, &count, &good, &ambig, adapters, r->gateway);
}
if ((rl->flags & RG_ENABLE) && (rl->spec.flags & RTSA_REMOTE_ENDPOINT))
{
test_route_helper(&ret, &count, &good, &ambig, adapters, rl->spec.remote_endpoint);
}
}
}
msg(D_ROUTE, "TEST ROUTES: %d/%d succeeded len=%d ret=%d a=%d u/d=%s",
good,
count,
len,
(int)ret,
ambig,
adapter_up ? "up" : "down");
gc_free(&gc);
return ret;
}
static const MIB_IPFORWARDROW *
get_default_gateway_row(const MIB_IPFORWARDTABLE *routes)
{
struct gc_arena gc = gc_new();
DWORD lowest_metric = MAXDWORD;
const MIB_IPFORWARDROW *ret = NULL;
int i;
int best = -1;
if (routes)
{
for (i = 0; i < routes->dwNumEntries; ++i)
{
const MIB_IPFORWARDROW *row = &routes->table[i];
const in_addr_t net = ntohl(row->dwForwardDest);
const in_addr_t mask = ntohl(row->dwForwardMask);
const DWORD index = row->dwForwardIfIndex;
const DWORD metric = row->dwForwardMetric1;
dmsg(D_ROUTE_DEBUG, "GDGR: route[%d] %s/%s i=%d m=%d",
i,
print_in_addr_t((in_addr_t) net, 0, &gc),
print_in_addr_t((in_addr_t) mask, 0, &gc),
(int)index,
(int)metric);
if (!net && !mask && metric < lowest_metric)
{
ret = row;
lowest_metric = metric;
best = i;
}
}
}
dmsg(D_ROUTE_DEBUG, "GDGR: best=%d lm=%u", best, (unsigned int)lowest_metric);
gc_free(&gc);
return ret;
}
void
get_default_gateway(struct route_gateway_info *rgi)
{
struct gc_arena gc = gc_new();
const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc);
const MIB_IPFORWARDTABLE *routes = get_windows_routing_table(&gc);
const MIB_IPFORWARDROW *row = get_default_gateway_row(routes);
DWORD a_index;
const IP_ADAPTER_INFO *ai;
CLEAR(*rgi);
if (row)
{
rgi->gateway.addr = ntohl(row->dwForwardNextHop);
if (rgi->gateway.addr)
{
rgi->flags |= RGI_ADDR_DEFINED;
a_index = adapter_index_of_ip(adapters, rgi->gateway.addr, NULL, &rgi->gateway.netmask);
if (a_index != TUN_ADAPTER_INDEX_INVALID)
{
rgi->adapter_index = a_index;
rgi->flags |= (RGI_IFACE_DEFINED|RGI_NETMASK_DEFINED);
ai = get_adapter(adapters, a_index);
if (ai)
{
memcpy(rgi->hwaddr, ai->Address, 6);
rgi->flags |= RGI_HWADDR_DEFINED;
}
}
}
}
gc_free(&gc);
}
static DWORD
windows_route_find_if_index(const struct route_ipv4 *r, const struct tuntap *tt)
{
struct gc_arena gc = gc_new();
DWORD ret = TUN_ADAPTER_INDEX_INVALID;
int count = 0;
const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc);
const IP_ADAPTER_INFO *tun_adapter = get_tun_adapter(tt, adapters);
bool on_tun = false;
/* first test on tun interface */
if (is_ip_in_adapter_subnet(tun_adapter, r->gateway, NULL))
{
ret = tun_adapter->Index;
count = 1;
on_tun = true;
}
else /* test on other interfaces */
{
count = test_route(adapters, r->gateway, &ret);
}
if (count == 0)
{
msg(M_WARN, "Warning: route gateway is not reachable on any active network adapters: %s",
print_in_addr_t(r->gateway, 0, &gc));
ret = TUN_ADAPTER_INDEX_INVALID;
}
else if (count > 1)
{
msg(M_WARN, "Warning: route gateway is ambiguous: %s (%d matches)",
print_in_addr_t(r->gateway, 0, &gc),
count);
}
dmsg(D_ROUTE_DEBUG, "DEBUG: route find if: on_tun=%d count=%d index=%d",
on_tun,
count,
(int)ret);
gc_free(&gc);
return ret;
}
/* IPv6 implementation using GetBestRoute2()
* (TBD: dynamic linking so the binary can still run on XP?)
* https://msdn.microsoft.com/en-us/library/windows/desktop/aa365922(v=vs.85).aspx
* https://msdn.microsoft.com/en-us/library/windows/desktop/aa814411(v=vs.85).aspx
*/
void
get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
const struct in6_addr *dest)
{
struct gc_arena gc = gc_new();
MIB_IPFORWARD_ROW2 BestRoute;
SOCKADDR_INET DestinationAddress, BestSourceAddress;
DWORD BestIfIndex;
DWORD status;
NET_LUID InterfaceLuid;
CLEAR(*rgi6);
CLEAR(InterfaceLuid); /* cleared = not used for lookup */
CLEAR(DestinationAddress);
DestinationAddress.si_family = AF_INET6;
if (dest)
{
DestinationAddress.Ipv6.sin6_addr = *dest;
}
status = GetBestInterfaceEx( &DestinationAddress, &BestIfIndex );
if (status != NO_ERROR)
{
msg(D_ROUTE, "NOTE: GetBestInterfaceEx returned error: %s (code=%u)",
strerror_win32(status, &gc),
(unsigned int)status);
goto done;
}
msg( D_ROUTE, "GetBestInterfaceEx() returned if=%d", (int) BestIfIndex );
status = GetBestRoute2( &InterfaceLuid, BestIfIndex, NULL,
&DestinationAddress, 0,
&BestRoute, &BestSourceAddress );
if (status != NO_ERROR)
{
msg(D_ROUTE, "NOTE: GetIpForwardEntry2 returned error: %s (code=%u)",
strerror_win32(status, &gc),
(unsigned int)status);
goto done;
}
msg( D_ROUTE, "GDG6: II=%lu DP=%s/%d NH=%s",
BestRoute.InterfaceIndex,
print_in6_addr( BestRoute.DestinationPrefix.Prefix.Ipv6.sin6_addr, 0, &gc),
BestRoute.DestinationPrefix.PrefixLength,
print_in6_addr( BestRoute.NextHop.Ipv6.sin6_addr, 0, &gc) );
msg( D_ROUTE, "GDG6: Metric=%d, Loopback=%d, AA=%d, I=%d",
(int) BestRoute.Metric,
(int) BestRoute.Loopback,
(int) BestRoute.AutoconfigureAddress,
(int) BestRoute.Immortal );
rgi6->gateway.addr_ipv6 = BestRoute.NextHop.Ipv6.sin6_addr;
rgi6->adapter_index = BestRoute.InterfaceIndex;
rgi6->flags |= RGI_ADDR_DEFINED | RGI_IFACE_DEFINED;
/* on-link is signalled by receiving an empty (::) NextHop */
if (IN6_IS_ADDR_UNSPECIFIED(&BestRoute.NextHop.Ipv6.sin6_addr) )
{
rgi6->flags |= RGI_ON_LINK;
}
done:
gc_free(&gc);
}
bool
add_route_ipapi(const struct route_ipv4 *r, const struct tuntap *tt, DWORD adapter_index)
{
struct gc_arena gc = gc_new();
bool ret = false;
DWORD status;
const DWORD if_index = (adapter_index == TUN_ADAPTER_INDEX_INVALID) ? windows_route_find_if_index(r, tt) : adapter_index;
if (if_index != TUN_ADAPTER_INDEX_INVALID)
{
MIB_IPFORWARDROW fr;
CLEAR(fr);
fr.dwForwardDest = htonl(r->network);
fr.dwForwardMask = htonl(r->netmask);
fr.dwForwardPolicy = 0;
fr.dwForwardNextHop = htonl(r->gateway);
fr.dwForwardIfIndex = if_index;
fr.dwForwardType = 4; /* the next hop is not the final dest */
fr.dwForwardProto = 3; /* PROTO_IP_NETMGMT */
fr.dwForwardAge = 0;
fr.dwForwardNextHopAS = 0;
fr.dwForwardMetric1 = (r->flags & RT_METRIC_DEFINED) ? r->metric : 1;
fr.dwForwardMetric2 = METRIC_NOT_USED;
fr.dwForwardMetric3 = METRIC_NOT_USED;
fr.dwForwardMetric4 = METRIC_NOT_USED;
fr.dwForwardMetric5 = METRIC_NOT_USED;
if ((r->network & r->netmask) != r->network)
{
msg(M_WARN, "Warning: address %s is not a network address in relation to netmask %s",
print_in_addr_t(r->network, 0, &gc),
print_in_addr_t(r->netmask, 0, &gc));
}
status = CreateIpForwardEntry(&fr);
if (status == NO_ERROR)
{
ret = true;
}
else
{
/* failed, try increasing the metric to work around Vista issue */
const unsigned int forward_metric_limit = 2048; /* iteratively retry higher metrics up to this limit */
for (; fr.dwForwardMetric1 <= forward_metric_limit; ++fr.dwForwardMetric1)
{
/* try a different forward type=3 ("the next hop is the final dest") in addition to 4.
* --redirect-gateway over RRAS seems to need this. */
for (fr.dwForwardType = 4; fr.dwForwardType >= 3; --fr.dwForwardType)
{
status = CreateIpForwardEntry(&fr);
if (status == NO_ERROR)
{
msg(D_ROUTE, "ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=%u and dwForwardType=%u",
(unsigned int)fr.dwForwardMetric1,
(unsigned int)fr.dwForwardType);
ret = true;
goto doublebreak;
}
else if (status != ERROR_BAD_ARGUMENTS)
{
goto doublebreak;
}
}
}
doublebreak:
if (status != NO_ERROR)
{
msg(M_WARN, "ROUTE: route addition failed using CreateIpForwardEntry: %s [status=%u if_index=%u]",
strerror_win32(status, &gc),
(unsigned int)status,
(unsigned int)if_index);
}
}
}
gc_free(&gc);
return ret;
}
bool
del_route_ipapi(const struct route_ipv4 *r, const struct tuntap *tt)
{
struct gc_arena gc = gc_new();
bool ret = false;
DWORD status;
const DWORD if_index = windows_route_find_if_index(r, tt);
if (if_index != TUN_ADAPTER_INDEX_INVALID)
{
MIB_IPFORWARDROW fr;
CLEAR(fr);
fr.dwForwardDest = htonl(r->network);
fr.dwForwardMask = htonl(r->netmask);
fr.dwForwardPolicy = 0;
fr.dwForwardNextHop = htonl(r->gateway);
fr.dwForwardIfIndex = if_index;
status = DeleteIpForwardEntry(&fr);
if (status == NO_ERROR)
{
ret = true;
}
else
{
msg(M_WARN, "ROUTE: route deletion failed using DeleteIpForwardEntry: %s",
strerror_win32(status, &gc));
}
}
gc_free(&gc);
return ret;
}
static bool
do_route_service(const bool add, const route_message_t *rt, const size_t size, HANDLE pipe)
{
DWORD len;
bool ret = false;
ack_message_t ack;
struct gc_arena gc = gc_new();
if (!WriteFile(pipe, rt, size, &len, NULL)
|| !ReadFile(pipe, &ack, sizeof(ack), &len, NULL))
{
msg(M_WARN, "ROUTE: could not talk to service: %s [%lu]",
strerror_win32(GetLastError(), &gc), GetLastError());
goto out;
}
if (ack.error_number != NO_ERROR)
{
msg(M_WARN, "ROUTE: route %s failed using service: %s [status=%u if_index=%d]",
(add ? "addition" : "deletion"), strerror_win32(ack.error_number, &gc),
ack.error_number, rt->iface.index);
goto out;
}
ret = true;
out:
gc_free(&gc);
return ret;
}
static bool
do_route_ipv4_service(const bool add, const struct route_ipv4 *r, const struct tuntap *tt)
{
DWORD if_index = windows_route_find_if_index(r, tt);
if (if_index == ~0)
{
return false;
}
route_message_t msg = {
.header = {
(add ? msg_add_route : msg_del_route),
sizeof(route_message_t),
0
},
.family = AF_INET,
.prefix.ipv4.s_addr = htonl(r->network),
.gateway.ipv4.s_addr = htonl(r->gateway),
.iface = { .index = if_index, .name = "" },
.metric = (r->flags & RT_METRIC_DEFINED ? r->metric : -1)
};
netmask_to_netbits(r->network, r->netmask, &msg.prefix_len);
if (msg.prefix_len == -1)
{
msg.prefix_len = 32;
}
return do_route_service(add, &msg, sizeof(msg), tt->options.msg_channel);
}
static bool
do_route_ipv6_service(const bool add, const struct route_ipv6 *r, const struct tuntap *tt)
{
bool status;
route_message_t msg = {
.header = {
(add ? msg_add_route : msg_del_route),
sizeof(route_message_t),
0
},
.family = AF_INET6,
.prefix.ipv6 = r->network,
.prefix_len = r->netbits,
.gateway.ipv6 = r->gateway,
.iface = { .index = tt->adapter_index, .name = "" },
.metric = ( (r->flags & RT_METRIC_DEFINED) ? r->metric : -1)
};
if (r->adapter_index) /* vpn server special route */
{
msg.iface.index = r->adapter_index;
}
/* In TUN mode we use a special link-local address as the next hop.
* The tapdrvr knows about it and will answer neighbor discovery packets.
* (only do this for routes actually using the tun/tap device)
*/
if (tt->type == DEV_TYPE_TUN
&& msg.iface.index == tt->adapter_index )
{
inet_pton(AF_INET6, "fe80::8", &msg.gateway.ipv6);
}
if (msg.iface.index == TUN_ADAPTER_INDEX_INVALID)
{
strncpy(msg.iface.name, tt->actual_name, sizeof(msg.iface.name));
msg.iface.name[sizeof(msg.iface.name) - 1] = '\0';
}
status = do_route_service(add, &msg, sizeof(msg), tt->options.msg_channel);
msg(D_ROUTE, "IPv6 route %s via service %s",
add ? "addition" : "deletion",
status ? "succeeded" : "failed");
return status;
}
static bool
add_route_service(const struct route_ipv4 *r, const struct tuntap *tt)
{
return do_route_ipv4_service(true, r, tt);
}
static bool
del_route_service(const struct route_ipv4 *r, const struct tuntap *tt)
{
return do_route_ipv4_service(false, r, tt);
}
static bool
add_route_ipv6_service(const struct route_ipv6 *r, const struct tuntap *tt)
{
return do_route_ipv6_service(true, r, tt);
}
static bool
del_route_ipv6_service(const struct route_ipv6 *r, const struct tuntap *tt)
{
return do_route_ipv6_service(false, r, tt);
}
static const char *
format_route_entry(const MIB_IPFORWARDROW *r, struct gc_arena *gc)
{
struct buffer out = alloc_buf_gc(256, gc);
buf_printf(&out, "%s %s %s p=%d i=%d t=%d pr=%d a=%d h=%d m=%d/%d/%d/%d/%d",
print_in_addr_t(r->dwForwardDest, IA_NET_ORDER, gc),
print_in_addr_t(r->dwForwardMask, IA_NET_ORDER, gc),
print_in_addr_t(r->dwForwardNextHop, IA_NET_ORDER, gc),
(int)r->dwForwardPolicy,
(int)r->dwForwardIfIndex,
(int)r->dwForwardType,
(int)r->dwForwardProto,
(int)r->dwForwardAge,
(int)r->dwForwardNextHopAS,
(int)r->dwForwardMetric1,
(int)r->dwForwardMetric2,
(int)r->dwForwardMetric3,
(int)r->dwForwardMetric4,
(int)r->dwForwardMetric5);
return BSTR(&out);
}
/*
* Show current routing table
*/
void
show_routes(int msglev)
{
struct gc_arena gc = gc_new();
int i;
const MIB_IPFORWARDTABLE *rt = get_windows_routing_table(&gc);
msg(msglev, "SYSTEM ROUTING TABLE");
if (rt)
{
for (i = 0; i < rt->dwNumEntries; ++i)
{
msg(msglev, "%s", format_route_entry(&rt->table[i], &gc));
}
}
gc_free(&gc);
}
#elif defined(TARGET_LINUX) || defined(TARGET_ANDROID)
void
get_default_gateway(struct route_gateway_info *rgi)
{
struct gc_arena gc = gc_new();
int sd = -1;
char best_name[16];
best_name[0] = 0;
CLEAR(*rgi);
#ifndef TARGET_ANDROID
/* get default gateway IP addr */
{
FILE *fp = fopen("/proc/net/route", "r");
if (fp)
{
char line[256];
int count = 0;
unsigned int lowest_metric = UINT_MAX;
in_addr_t best_gw = 0;
bool found = false;
while (fgets(line, sizeof(line), fp) != NULL)
{
if (count)
{
unsigned int net_x = 0;
unsigned int mask_x = 0;
unsigned int gw_x = 0;
unsigned int metric = 0;
unsigned int flags = 0;
char name[16];
name[0] = 0;
const int np = sscanf(line, "%15s\t%x\t%x\t%x\t%*s\t%*s\t%d\t%x",
name,
&net_x,
&gw_x,
&flags,
&metric,
&mask_x);
if (np == 6 && (flags & IFF_UP))
{
const in_addr_t net = ntohl(net_x);
const in_addr_t mask = ntohl(mask_x);
const in_addr_t gw = ntohl(gw_x);
if (!net && !mask && metric < lowest_metric)
{
found = true;
best_gw = gw;
strcpy(best_name, name);
lowest_metric = metric;
}
}
}
++count;
}
fclose(fp);
if (found)
{
rgi->gateway.addr = best_gw;
rgi->flags |= RGI_ADDR_DEFINED;
if (!rgi->gateway.addr && best_name[0])
{
rgi->flags |= RGI_ON_LINK;
}
}
}
}
#else /* ifndef TARGET_ANDROID */
/* Android, set some pseudo GW, addr is in host byte order,
* Determining the default GW on Android 5.0+ is non trivial
* and serves almost no purpose since OpenVPN only uses the
* default GW address to add routes for networks that should
* NOT be routed over the VPN. Using a well known address
* (127.'d'.'g'.'w') for the default GW make detecting
* these routes easier from the controlling app.
*/
rgi->gateway.addr = 127 << 24 | 'd' << 16 | 'g' << 8 | 'w';
rgi->flags |= RGI_ADDR_DEFINED;
strcpy(best_name, "android-gw");
#endif /* ifndef TARGET_ANDROID */
/* scan adapter list */
if (rgi->flags & RGI_ADDR_DEFINED)
{
struct ifreq *ifr, *ifend;
in_addr_t addr, netmask;
struct ifreq ifreq;
struct ifconf ifc;
struct ifreq ifs[20]; /* Maximum number of interfaces to scan */
if ((sd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
msg(M_WARN, "GDG: socket() failed");
goto done;
}
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(sd, SIOCGIFCONF, &ifc) < 0)
{
msg(M_WARN, "GDG: ioctl(SIOCGIFCONF) failed");
goto done;
}
/* scan through interface list */
ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
{
if (ifr->ifr_addr.sa_family == AF_INET)
{
/* get interface addr */
addr = ntohl(((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr);
/* get interface name */
strncpynt(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
/* check that the interface is up */
if (ioctl(sd, SIOCGIFFLAGS, &ifreq) < 0)
{
continue;
}
if (!(ifreq.ifr_flags & IFF_UP))
{
continue;
}
if (rgi->flags & RGI_ON_LINK)
{
/* check that interface name of current interface
* matches interface name of best default route */
if (strcmp(ifreq.ifr_name, best_name))
{
continue;
}
#if 0
/* if point-to-point link, use remote addr as route gateway */
if ((ifreq.ifr_flags & IFF_POINTOPOINT) && ioctl(sd, SIOCGIFDSTADDR, &ifreq) >= 0)
{
rgi->gateway.addr = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr);
if (rgi->gateway.addr)
{
rgi->flags &= ~RGI_ON_LINK;
}
}
#endif
}
else
{
/* get interface netmask */
if (ioctl(sd, SIOCGIFNETMASK, &ifreq) < 0)
{
continue;
}
netmask = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr);
/* check that interface matches default route */
if (((rgi->gateway.addr ^ addr) & netmask) != 0)
{
continue;
}
/* save netmask */
rgi->gateway.netmask = netmask;
rgi->flags |= RGI_NETMASK_DEFINED;
}
/* save iface name */
strncpynt(rgi->iface, ifreq.ifr_name, sizeof(rgi->iface));
rgi->flags |= RGI_IFACE_DEFINED;
/* now get the hardware address. */
memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
if (ioctl(sd, SIOCGIFHWADDR, &ifreq) < 0)
{
msg(M_WARN, "GDG: SIOCGIFHWADDR(%s) failed", ifreq.ifr_name);
goto done;
}
memcpy(rgi->hwaddr, &ifreq.ifr_hwaddr.sa_data, 6);
rgi->flags |= RGI_HWADDR_DEFINED;
break;
}
}
}
done:
if (sd >= 0)
{
close(sd);
}
gc_free(&gc);
}
/* IPv6 implementation using netlink
* http://www.linuxjournal.com/article/7356
* netlink(3), netlink(7), rtnetlink(7)
* http://www.virtualbox.org/svn/vbox/trunk/src/VBox/NetworkServices/NAT/rtmon_linux.c
*/
struct rtreq {
struct nlmsghdr nh;
struct rtmsg rtm;
char attrbuf[512];
};
void
get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
const struct in6_addr *dest)
{
int nls = -1;
struct rtreq rtreq;
struct rtattr *rta;
char rtbuf[2000];
ssize_t ssize;
CLEAR(*rgi6);
nls = socket( PF_NETLINK, SOCK_RAW, NETLINK_ROUTE );
if (nls < 0)
{
msg(M_WARN|M_ERRNO, "GDG6: socket() failed" ); goto done;
}
/* bind() is not needed, no unsolicited msgs coming in */
/* request best matching route, see netlink(7) for explanations
*/
CLEAR(rtreq);
rtreq.nh.nlmsg_type = RTM_GETROUTE;
rtreq.nh.nlmsg_flags = NLM_F_REQUEST; /* best match only */
rtreq.rtm.rtm_family = AF_INET6;
rtreq.rtm.rtm_src_len = 0; /* not source dependent */
rtreq.rtm.rtm_dst_len = 128; /* exact dst */
rtreq.rtm.rtm_table = RT_TABLE_MAIN;
rtreq.rtm.rtm_protocol = RTPROT_UNSPEC;
rtreq.nh.nlmsg_len = NLMSG_SPACE(sizeof(rtreq.rtm));
/* set RTA_DST for target IPv6 address we want */
rta = (struct rtattr *)(((char *) &rtreq)+NLMSG_ALIGN(rtreq.nh.nlmsg_len));
rta->rta_type = RTA_DST;
rta->rta_len = RTA_LENGTH(16);
rtreq.nh.nlmsg_len = NLMSG_ALIGN(rtreq.nh.nlmsg_len)
+RTA_LENGTH(16);
if (dest == NULL) /* ::, unspecified */
{
memset( RTA_DATA(rta), 0, 16 ); /* :: = all-zero */
}
else
{
memcpy( RTA_DATA(rta), (void *)dest, 16 );
}
/* send and receive reply */
if (send( nls, &rtreq, rtreq.nh.nlmsg_len, 0 ) < 0)
{
msg(M_WARN|M_ERRNO, "GDG6: send() failed" ); goto done;
}
ssize = recv(nls, rtbuf, sizeof(rtbuf), MSG_TRUNC);
if (ssize < 0)
{
msg(M_WARN|M_ERRNO, "GDG6: recv() failed" ); goto done;
}
if (ssize > sizeof(rtbuf))
{
msg(M_WARN, "get_default_gateway_ipv6: returned message too big for buffer (%d>%d)", (int)ssize, (int)sizeof(rtbuf) );
goto done;
}
struct nlmsghdr *nh;
for (nh = (struct nlmsghdr *)rtbuf;
NLMSG_OK(nh, ssize);
nh = NLMSG_NEXT(nh, ssize))
{
struct rtmsg *rtm;
int attrlen;
if (nh->nlmsg_type == NLMSG_DONE)
{
break;
}
if (nh->nlmsg_type == NLMSG_ERROR)
{
struct nlmsgerr *ne = (struct nlmsgerr *)NLMSG_DATA(nh);
/* since linux-4.11 -ENETUNREACH is returned when no route can be
* found. Don't print any error message in this case */
if (ne->error != -ENETUNREACH)
{
msg(M_WARN, "GDG6: NLMSG_ERROR: error %s\n",
strerror(-ne->error));
}
break;
}
if (nh->nlmsg_type != RTM_NEWROUTE)
{
/* shouldn't happen */
msg(M_WARN, "GDG6: unexpected msg_type %d", nh->nlmsg_type );
continue;
}
rtm = (struct rtmsg *)NLMSG_DATA(nh);
attrlen = RTM_PAYLOAD(nh);
/* we're only looking for routes in the main table, as "we have
* no IPv6" will lead to a lookup result in "Local" (::/0 reject)
*/
if (rtm->rtm_family != AF_INET6
|| rtm->rtm_table != RT_TABLE_MAIN)
{
continue;
} /* we're not interested */
for (rta = RTM_RTA(rtm);
RTA_OK(rta, attrlen);
rta = RTA_NEXT(rta, attrlen))
{
if (rta->rta_type == RTA_GATEWAY)
{
if (RTA_PAYLOAD(rta) != sizeof(struct in6_addr) )
{
msg(M_WARN, "GDG6: RTA_GW size mismatch"); continue;
}
rgi6->gateway.addr_ipv6 = *(struct in6_addr *) RTA_DATA(rta);
rgi6->flags |= RGI_ADDR_DEFINED;
}
else if (rta->rta_type == RTA_OIF)
{
char ifname[IF_NAMESIZE+1];
int oif;
if (RTA_PAYLOAD(rta) != sizeof(oif) )
{
msg(M_WARN, "GDG6: oif size mismatch"); continue;
}
memcpy(&oif, RTA_DATA(rta), sizeof(oif));
if_indextoname(oif,ifname);
strncpy( rgi6->iface, ifname, sizeof(rgi6->iface)-1 );
rgi6->flags |= RGI_IFACE_DEFINED;
}
}
}
/* if we have an interface but no gateway, the destination is on-link */
if ( ( rgi6->flags & (RGI_IFACE_DEFINED|RGI_ADDR_DEFINED) ) ==
RGI_IFACE_DEFINED)
{
rgi6->flags |= (RGI_ADDR_DEFINED | RGI_ON_LINK);
if (dest)
{
rgi6->gateway.addr_ipv6 = *dest;
}
}
done:
if (nls >= 0)
{
close(nls);
}
}
#elif defined(TARGET_DARWIN) || defined(TARGET_SOLARIS) \
|| defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \
|| defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/route.h>
#include <net/if_dl.h>
struct rtmsg {
struct rt_msghdr m_rtm;
char m_space[512];
};
/* the route socket code is identical for all 4 supported BSDs and for
* MacOS X (Darwin), with one crucial difference: when going from
* 32 bit to 64 bit, the BSDs increased the structure size but kept
* source code compatibility by keeping the use of "long", while
* MacOS X decided to keep binary compatibility by *changing* the API
* to use "uint32_t", thus 32 bit on all OS X variants
*
* We used to have a large amount of duplicate code here which really
* differed only in this (long) vs. (uint32_t) - IMHO, worse than
* having a combined block for all BSDs with this single #ifdef inside
*/
#if defined(TARGET_DARWIN)
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(uint32_t) - 1))) : sizeof(uint32_t))
#else
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#endif
#if defined(TARGET_SOLARIS)
#define NEXTADDR(w, u) \
if (rtm_addrs & (w)) { \
l = ROUNDUP(sizeof(u)); memmove(cp, &(u), l); cp += l; \
}
#define ADVANCE(x, n) (x += ROUNDUP(sizeof(struct sockaddr_in)))
#else /* if defined(TARGET_SOLARIS) */
#define NEXTADDR(w, u) \
if (rtm_addrs & (w)) { \
l = ROUNDUP( ((struct sockaddr *)&(u))->sa_len); memmove(cp, &(u), l); cp += l; \
}
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
#endif
#define max(a,b) ((a) > (b) ? (a) : (b))
void
get_default_gateway(struct route_gateway_info *rgi)
{
struct gc_arena gc = gc_new();
struct rtmsg m_rtmsg;
int sockfd = -1;
int seq, l, pid, rtm_addrs;
unsigned int i;
struct sockaddr so_dst, so_mask;
char *cp = m_rtmsg.m_space;
struct sockaddr *gate = NULL, *ifp = NULL, *sa;
struct rt_msghdr *rtm_aux;
#define rtm m_rtmsg.m_rtm
CLEAR(*rgi);
/* setup data to send to routing socket */
pid = getpid();
seq = 0;
rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP;
bzero(&m_rtmsg, sizeof(m_rtmsg));
bzero(&so_dst, sizeof(so_dst));
bzero(&so_mask, sizeof(so_mask));
bzero(&rtm, sizeof(struct rt_msghdr));
rtm.rtm_type = RTM_GET;
rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
rtm.rtm_version = RTM_VERSION;
rtm.rtm_seq = ++seq;
#ifdef TARGET_OPENBSD
rtm.rtm_tableid = getrtable();
#endif
rtm.rtm_addrs = rtm_addrs;
so_dst.sa_family = AF_INET;
so_mask.sa_family = AF_INET;
#ifndef TARGET_SOLARIS
so_dst.sa_len = sizeof(struct sockaddr_in);
so_mask.sa_len = sizeof(struct sockaddr_in);
#endif
NEXTADDR(RTA_DST, so_dst);
NEXTADDR(RTA_NETMASK, so_mask);
rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
/* transact with routing socket */
sockfd = socket(PF_ROUTE, SOCK_RAW, 0);
if (sockfd < 0)
{
msg(M_WARN, "GDG: socket #1 failed");
goto done;
}
if (write(sockfd, (char *)&m_rtmsg, l) < 0)
{
msg(M_WARN, "GDG: problem writing to routing socket");
goto done;
}
do
{
l = read(sockfd, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
close(sockfd);
sockfd = -1;
/* extract return data from routing socket */
rtm_aux = &rtm;
cp = ((char *)(rtm_aux + 1));
if (rtm_aux->rtm_addrs)
{
for (i = 1; i; i <<= 1)
{
if (i & rtm_aux->rtm_addrs)
{
sa = (struct sockaddr *)cp;
if (i == RTA_GATEWAY)
{
gate = sa;
}
else if (i == RTA_IFP)
{
ifp = sa;
}
ADVANCE(cp, sa);
}
}
}
else
{
goto done;
}
/* get gateway addr and interface name */
if (gate != NULL)
{
/* get default gateway addr */
rgi->gateway.addr = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr);
if (rgi->gateway.addr)
{
rgi->flags |= RGI_ADDR_DEFINED;
}
if (ifp)
{
/* get interface name */
const struct sockaddr_dl *adl = (struct sockaddr_dl *) ifp;
if (adl->sdl_nlen && adl->sdl_nlen < sizeof(rgi->iface))
{
memcpy(rgi->iface, adl->sdl_data, adl->sdl_nlen);
rgi->iface[adl->sdl_nlen] = '\0';
rgi->flags |= RGI_IFACE_DEFINED;
}
}
}
/* get netmask of interface that owns default gateway */
if (rgi->flags & RGI_IFACE_DEFINED)
{
struct ifreq ifr;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
{
msg(M_WARN, "GDG: socket #2 failed");
goto done;
}
CLEAR(ifr);
ifr.ifr_addr.sa_family = AF_INET;
strncpynt(ifr.ifr_name, rgi->iface, IFNAMSIZ);
if (ioctl(sockfd, SIOCGIFNETMASK, (char *)&ifr) < 0)
{
msg(M_WARN, "GDG: ioctl #1 failed");
goto done;
}
close(sockfd);
sockfd = -1;
rgi->gateway.netmask = ntohl(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr);
rgi->flags |= RGI_NETMASK_DEFINED;
}
/* try to read MAC addr associated with interface that owns default gateway */
if (rgi->flags & RGI_IFACE_DEFINED)
{
struct ifconf ifc;
struct ifreq *ifr;
const int bufsize = 4096;
char *buffer;
buffer = (char *) gc_malloc(bufsize, true, &gc);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
{
msg(M_WARN, "GDG: socket #3 failed");
goto done;
}
ifc.ifc_len = bufsize;
ifc.ifc_buf = buffer;
if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)
{
msg(M_WARN, "GDG: ioctl #2 failed");
goto done;
}
close(sockfd);
sockfd = -1;
for (cp = buffer; cp <= buffer + ifc.ifc_len - sizeof(struct ifreq); )
{
ifr = (struct ifreq *)cp;
#if defined(TARGET_SOLARIS)
const size_t len = sizeof(ifr->ifr_name) + sizeof(ifr->ifr_addr);
#else
const size_t len = sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);
#endif
if (!ifr->ifr_addr.sa_family)
{
break;
}
if (!strncmp(ifr->ifr_name, rgi->iface, IFNAMSIZ))
{
if (ifr->ifr_addr.sa_family == AF_LINK)
{
struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
memcpy(rgi->hwaddr, LLADDR(sdl), 6);
rgi->flags |= RGI_HWADDR_DEFINED;
}
}
cp += len;
}
}
done:
if (sockfd >= 0)
{
close(sockfd);
}
gc_free(&gc);
}
/* BSD implementation using routing socket (as does IPv4)
* (the code duplication is somewhat unavoidable if we want this to
* work on OpenSolaris as well. *sigh*)
*/
/* Solaris has no length field - this is ugly, but less #ifdef in total
*/
#if defined(TARGET_SOLARIS)
#undef ADVANCE
#define ADVANCE(x, n) (x += ROUNDUP(sizeof(struct sockaddr_in6)))
#endif
void
get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
const struct in6_addr *dest)
{
struct rtmsg m_rtmsg;
int sockfd = -1;
int seq, l, pid, rtm_addrs;
unsigned int i;
struct sockaddr_in6 so_dst, so_mask;
char *cp = m_rtmsg.m_space;
struct sockaddr *gate = NULL, *ifp = NULL, *sa;
struct rt_msghdr *rtm_aux;
CLEAR(*rgi6);
/* setup data to send to routing socket */
pid = getpid();
seq = 0;
rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP;
bzero(&m_rtmsg, sizeof(m_rtmsg));
bzero(&so_dst, sizeof(so_dst));
bzero(&so_mask, sizeof(so_mask));
bzero(&rtm, sizeof(struct rt_msghdr));
rtm.rtm_type = RTM_GET;
rtm.rtm_flags = RTF_UP;
rtm.rtm_version = RTM_VERSION;
rtm.rtm_seq = ++seq;
#ifdef TARGET_OPENBSD
rtm.rtm_tableid = getrtable();
#endif
so_dst.sin6_family = AF_INET6;
so_mask.sin6_family = AF_INET6;
if (dest != NULL /* specific host? */
&& !IN6_IS_ADDR_UNSPECIFIED(dest) )
{
so_dst.sin6_addr = *dest;
/* :: needs /0 "netmask", host route wants "no netmask */
rtm_addrs &= ~RTA_NETMASK;
}
rtm.rtm_addrs = rtm_addrs;
#ifndef TARGET_SOLARIS
so_dst.sin6_len = sizeof(struct sockaddr_in6);
so_mask.sin6_len = sizeof(struct sockaddr_in6);
#endif
NEXTADDR(RTA_DST, so_dst);
NEXTADDR(RTA_NETMASK, so_mask);
rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
/* transact with routing socket */
sockfd = socket(PF_ROUTE, SOCK_RAW, 0);
if (sockfd < 0)
{
msg(M_WARN, "GDG6: socket #1 failed");
goto done;
}
if (write(sockfd, (char *)&m_rtmsg, l) < 0)
{
msg(M_WARN, "GDG6: problem writing to routing socket");
goto done;
}
do
{
l = read(sockfd, (char *)&m_rtmsg, sizeof(m_rtmsg));
}
while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
close(sockfd);
sockfd = -1;
/* extract return data from routing socket */
rtm_aux = &rtm;
cp = ((char *)(rtm_aux + 1));
if (rtm_aux->rtm_addrs)
{
for (i = 1; i; i <<= 1)
{
if (i & rtm_aux->rtm_addrs)
{
sa = (struct sockaddr *)cp;
if (i == RTA_GATEWAY)
{
gate = sa;
}
else if (i == RTA_IFP)
{
ifp = sa;
}
ADVANCE(cp, sa);
}
}
}
else
{
goto done;
}
/* get gateway addr and interface name */
if (gate != NULL)
{
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)gate;
struct in6_addr gw = s6->sin6_addr;
#ifndef TARGET_SOLARIS
/* You do not really want to know... from FreeBSD's route.c
* (KAME encodes the 16 bit scope_id in s6_addr[2] + [3],
* but for a correct link-local address these must be :0000: )
*/
if (gate->sa_len == sizeof(struct sockaddr_in6)
&& IN6_IS_ADDR_LINKLOCAL(&gw) )
{
gw.s6_addr[2] = gw.s6_addr[3] = 0;
}
if (gate->sa_len != sizeof(struct sockaddr_in6)
|| IN6_IS_ADDR_UNSPECIFIED(&gw) )
{
rgi6->flags |= RGI_ON_LINK;
}
else
#endif
rgi6->gateway.addr_ipv6 = gw;
rgi6->flags |= RGI_ADDR_DEFINED;
if (ifp)
{
/* get interface name */
const struct sockaddr_dl *adl = (struct sockaddr_dl *) ifp;
if (adl->sdl_nlen && adl->sdl_nlen < sizeof(rgi6->iface))
{
memcpy(rgi6->iface, adl->sdl_data, adl->sdl_nlen);
rgi6->flags |= RGI_IFACE_DEFINED;
}
}
}
done:
if (sockfd >= 0)
{
close(sockfd);
}
}
#undef max
#else /* if defined(_WIN32) */
/*
* This is a platform-specific method that returns data about
* the current default gateway. Return data is placed into
* a struct route_gateway_info object provided by caller. The
* implementation should CLEAR the structure before adding
* data to it.
*
* Data returned includes:
* 1. default gateway address (rgi->gateway.addr)
* 2. netmask of interface that owns default gateway
* (rgi->gateway.netmask)
* 3. hardware address (i.e. MAC address) of interface that owns
* default gateway (rgi->hwaddr)
* 4. interface name (or adapter index on Windows) that owns default
* gateway (rgi->iface or rgi->adapter_index)
* 5. an array of additional address/netmask pairs defined by
* interface that owns default gateway (rgi->addrs with length
* given in rgi->n_addrs)
*
* The flags RGI_x_DEFINED may be used to indicate which of the data
* members were successfully returned (set in rgi->flags). All of
* the data members are optional, however certain OpenVPN functionality
* may be disabled by missing items.
*/
void
get_default_gateway(struct route_gateway_info *rgi)
{
CLEAR(*rgi);
}
void
get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
const struct in6_addr *dest)
{
msg(D_ROUTE, "no support for get_default_gateway_ipv6() on this system");
CLEAR(*rgi6);
}
#endif /* if defined(_WIN32) */
bool
netmask_to_netbits(const in_addr_t network, const in_addr_t netmask, int *netbits)
{
int i;
const int addrlen = sizeof(in_addr_t) * 8;
if ((network & netmask) == network)
{
for (i = 0; i <= addrlen; ++i)
{
in_addr_t mask = netbits_to_netmask(i);
if (mask == netmask)
{
if (i == addrlen)
{
*netbits = -1;
}
else
{
*netbits = i;
}
return true;
}
}
}
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,
* so that outgoing packets to these servers don't end up in the tunnel.
*/
#if defined(_WIN32)
static void
add_host_route_if_nonlocal(struct route_bypass *rb, const in_addr_t addr)
{
if (test_local_addr(addr, NULL) == TLA_NONLOCAL && addr != 0 && addr != IPV4_NETMASK_HOST)
{
add_bypass_address(rb, addr);
}
}
static void
add_host_route_array(struct route_bypass *rb, const IP_ADDR_STRING *iplist)
{
while (iplist)
{
bool succeed = false;
const in_addr_t ip = getaddr(GETADDR_HOST_ORDER, iplist->IpAddress.String, 0, &succeed, NULL);
if (succeed)
{
add_host_route_if_nonlocal(rb, ip);
}
iplist = iplist->Next;
}
}
static void
get_bypass_addresses(struct route_bypass *rb, const unsigned int flags)
{
struct gc_arena gc = gc_new();
/*bool ret_bool = false;*/
/* get full routing table */
const MIB_IPFORWARDTABLE *routes = get_windows_routing_table(&gc);
/* get the route which represents the default gateway */
const MIB_IPFORWARDROW *row = get_default_gateway_row(routes);
if (row)
{
/* get the adapter which the default gateway is associated with */
const IP_ADAPTER_INFO *dgi = get_adapter_info(row->dwForwardIfIndex, &gc);
/* get extra adapter info, such as DNS addresses */
const IP_PER_ADAPTER_INFO *pai = get_per_adapter_info(row->dwForwardIfIndex, &gc);
/* Bypass DHCP server address */
if ((flags & RG_BYPASS_DHCP) && dgi && dgi->DhcpEnabled)
{
add_host_route_array(rb, &dgi->DhcpServer);
}
/* Bypass DNS server addresses */
if ((flags & RG_BYPASS_DNS) && pai)
{
add_host_route_array(rb, &pai->DnsServerList);
}
}
gc_free(&gc);
}
#else /* if defined(_WIN32) */
static void
get_bypass_addresses(struct route_bypass *rb, const unsigned int flags) /* PLATFORM-SPECIFIC */
{
}
#endif /* if defined(_WIN32) */
/*
* 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 target platform doesn't implement this
* function, return ILA_NOT_IMPLEMENTED.
*
* Used by redirect-gateway autolocal feature
*/
#if defined(_WIN32)
int
test_local_addr(const in_addr_t addr, const struct route_gateway_info *rgi)
{
struct gc_arena gc = gc_new();
const in_addr_t nonlocal_netmask = 0x80000000L; /* routes with netmask <= to this are considered non-local */
int ret = TLA_NONLOCAL;
/* get full routing table */
const MIB_IPFORWARDTABLE *rt = get_windows_routing_table(&gc);
if (rt)
{
int i;
for (i = 0; i < rt->dwNumEntries; ++i)
{
const MIB_IPFORWARDROW *row = &rt->table[i];
const in_addr_t net = ntohl(row->dwForwardDest);
const in_addr_t mask = ntohl(row->dwForwardMask);
if (mask > nonlocal_netmask && (addr & mask) == net)
{
ret = TLA_LOCAL;
break;
}
}
}
gc_free(&gc);
return ret;
}
#else /* if defined(_WIN32) */
int
test_local_addr(const in_addr_t addr, const struct route_gateway_info *rgi) /* PLATFORM-SPECIFIC */
{
if (rgi)
{
if (local_route(addr, 0xFFFFFFFF, rgi->gateway.addr, rgi))
{
return TLA_LOCAL;
}
else
{
return TLA_NONLOCAL;
}
}
return TLA_NOT_IMPLEMENTED;
}
#endif /* if defined(_WIN32) */