/* * 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 * * 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 "networking.h" #include "memdbg.h" #if defined(TARGET_LINUX) || defined(TARGET_ANDROID) #include /* 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, openvpn_net_ctx_t *ctx); 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; } /* 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, openvpn_net_ctx_t *ctx) { 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, ctx); 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, openvpn_net_ctx_t *ctx) { 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, ctx); 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, openvpn_net_ctx_t *ctx) { 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, ctx); } 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, openvpn_net_ctx_t *ctx) { 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, ctx); } 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, openvpn_net_ctx_t *ctx) { 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, ctx); } } } 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, openvpn_net_ctx_t *ctx) { 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, ctx); } } } static void redirect_default_route_to_vpn(struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es, openvpn_net_ctx_t *ctx) { const char err[] = "NOTE: unable to redirect IPv4 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, ctx); 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, ctx); 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, ctx); /* add new default route (2nd component) */ add_route3(0x80000000, 0x80000000, rl->spec.remote_endpoint, tt, flags, &rl->rgi, es, ctx); } 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, ctx); } /* add new default route */ add_route3(0, 0, rl->spec.remote_endpoint, tt, flags, &rl->rgi, es, ctx); } } /* 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, openvpn_net_ctx_t *ctx) { 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, ctx); 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, ctx); 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, ctx); /* delete default route (2nd component) */ del_route3(0x80000000, 0x80000000, rl->spec.remote_endpoint, tt, flags, &rl->rgi, es, ctx); } else { /* delete default route */ del_route3(0, 0, rl->spec.remote_endpoint, tt, flags, &rl->rgi, es, ctx); /* 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, ctx); } } } 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, openvpn_net_ctx_t *ctx) { redirect_default_route_to_vpn(rl, tt, flags, es, ctx); if (rl && !(rl->iflags & RL_ROUTES_ADDED) ) { struct route_ipv4 *r; if (rl->routes && !tt->did_ifconfig_setup) { msg(M_INFO, "WARNING: OpenVPN was configured to add an IPv4 " "route. However, no IPv4 has been configured for %s, " "therefore the route installation may fail or may not work " "as expected.", tt->actual_name); } #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, ctx); } add_route(r, tt, flags, &rl->rgi, es, ctx); } 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. However, no IPv6 has been configured for %s, " "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, ctx); } add_route_ipv6(r, tt, flags, es, ctx); } 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, openvpn_net_ctx_t *ctx) { 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, ctx); } rl->iflags &= ~RL_ROUTES_ADDED; } undo_redirect_default_route_to_vpn(rl, tt, flags, es, ctx); 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, ctx); } 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, openvpn_net_ctx_t *ctx) { struct gc_arena gc; struct argv argv = argv_new(); #if !defined(TARGET_LINUX) const char *network; #if !defined(TARGET_AIX) const char *netmask; #endif const char *gateway; #endif bool status = false; int is_local_route; if (!(r->flags & RT_DEFINED)) { return; } gc_init(&gc); #if !defined(TARGET_LINUX) network = print_in_addr_t(r->network, 0, &gc); #if !defined(TARGET_AIX) netmask = print_in_addr_t(r->netmask, 0, &gc); #endif 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) const char *iface = NULL; int metric = -1; if (is_on_link(is_local_route, flags, rgi)) { iface = rgi->iface; } if (r->flags & RT_METRIC_DEFINED) { metric = r->metric; } status = true; if (net_route_v4_add(ctx, &r->network, netmask_to_netbits2(r->netmask), &r->gateway, iface, 0, metric) < 0) { msg(M_WARN, "ERROR: Linux route add command failed"); status = false; } #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%s 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_free(&argv); gc_free(&gc); /* release resources potentially allocated during route setup */ net_ctx_reset(ctx); } 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 * explicitly 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, openvpn_net_ctx_t *ctx) { struct gc_arena gc; struct argv argv = argv_new(); const char *network; const char *gateway; bool status = false; const char *device = tt->actual_name; #if defined(TARGET_LINUX) int metric; #endif 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 (gateway_needed && IN6_IS_ADDR_UNSPECIFIED(&r6->gateway)) { msg(M_WARN, "ROUTE6 WARNING: " PACKAGE_NAME " needs a gateway " "parameter for a --route-ipv6 option and no default was set via " "--ifconfig-ipv6 or --route-ipv6-gateway option. Not installing " "IPv6 route to %s/%d.", network, r6->netbits); status = false; goto done; } #if defined(TARGET_LINUX) metric = -1; if ((r6->flags & RT_METRIC_DEFINED) && (r6->metric > 0)) { metric = r6->metric; } status = true; if (net_route_v6_add(ctx, &r6->network, r6->netbits, gateway_needed ? &r6->gateway : NULL, device, 0, metric) < 0) { msg(M_WARN, "ERROR: Linux IPv6 route can't be added"); status = false; } #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%s 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 (not tap), not "elsewhere"? -> metric 0 */ if (tt->type == DEV_TYPE_TUN && !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) */ done: if (status) { r6->flags |= RT_ADDED; } else { r6->flags &= ~RT_ADDED; } argv_free(&argv); gc_free(&gc); /* release resources potentially allocated during route setup */ net_ctx_reset(ctx); } 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, openvpn_net_ctx_t *ctx) { struct gc_arena gc; struct argv argv = argv_new(); #if !defined(TARGET_LINUX) const char *network; #if !defined(TARGET_AIX) const char *netmask; #endif #if !defined(TARGET_ANDROID) const char *gateway; #endif #else /* if !defined(TARGET_LINUX) */ int metric; #endif int is_local_route; if ((r->flags & (RT_DEFINED|RT_ADDED)) != (RT_DEFINED|RT_ADDED)) { return; } gc_init(&gc); #if !defined(TARGET_LINUX) network = print_in_addr_t(r->network, 0, &gc); #if !defined(TARGET_AIX) netmask = print_in_addr_t(r->netmask, 0, &gc); #endif #if !defined(TARGET_ANDROID) gateway = print_in_addr_t(r->gateway, 0, &gc); #endif #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) metric = -1; if (r->flags & RT_METRIC_DEFINED) { metric = r->metric; } if (net_route_v4_del(ctx, &r->network, netmask_to_netbits2(r->netmask), &r->gateway, NULL, 0, metric) < 0) { msg(M_WARN, "ERROR: Linux route delete command failed"); } #elif defined (_WIN32) argv_printf(&argv, "%s%s 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_free(&argv); gc_free(&gc); /* release resources potentially allocated during route cleanup */ net_ctx_reset(ctx); } void delete_route_ipv6(const struct route_ipv6 *r6, const struct tuntap *tt, unsigned int flags, const struct env_set *es, openvpn_net_ctx_t *ctx) { struct gc_arena gc; struct argv argv = argv_new(); const char *network; #if !defined(TARGET_LINUX) const char *gateway; #else int metric; #endif 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); #if !defined(TARGET_LINUX) gateway = print_in6_addr( r6->gateway, 0, &gc); #endif #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) metric = -1; if ((r6->flags & RT_METRIC_DEFINED) && (r6->metric > 0)) { metric = r6->metric; } if (net_route_v6_del(ctx, &r6->network, r6->netbits, gateway_needed ? &r6->gateway : NULL, device, 0, metric) < 0) { msg(M_WARN, "ERROR: Linux route v6 delete 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%s 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_free(&argv); gc_free(&gc); /* release resources potentially allocated during route cleanup */ net_ctx_reset(ctx); } /* * 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, openvpn_net_ctx_t *ctx) { 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, openvpn_net_ctx_t *ctx) { 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( (struct sockaddr *)&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) { bool ret = false; ack_message_t ack; struct gc_arena gc = gc_new(); if (!send_msg_iservice(pipe, rt, size, &ack, "ROUTE")) { 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_ANDROID) void get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx) { /* 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. */ CLEAR(*rgi); rgi->gateway.addr = 127 << 24 | 'd' << 16 | 'g' << 8 | 'w'; rgi->flags = RGI_ADDR_DEFINED | RGI_IFACE_DEFINED; strcpy(rgi->iface, "android-gw"); /* Skip scanning/fetching interface from loopback interface we do * normally on Linux. * It always fails and "ioctl(SIOCGIFCONF) failed" confuses users */ } void get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6, const struct in6_addr *dest, openvpn_net_ctx_t *ctx) { /* Same for ipv6 */ CLEAR(*rgi6); /* Use a fake link-local address */ ASSERT(inet_pton(AF_INET6, "fe80::ad", &rgi6->addrs->addr_ipv6) == 1); rgi6->addrs->netbits_ipv6 = 64; rgi6->flags = RGI_ADDR_DEFINED | RGI_IFACE_DEFINED; strcpy(rgi6->iface, "android-gw"); } #elif defined(TARGET_LINUX) void get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx) { struct gc_arena gc = gc_new(); int sd = -1; char best_name[IFNAMSIZ]; CLEAR(*rgi); CLEAR(best_name); /* get default gateway IP addr */ if (net_route_v4_best_gw(ctx, NULL, &rgi->gateway.addr, best_name) == 0) { rgi->flags |= RGI_ADDR_DEFINED; if (!rgi->gateway.addr && best_name[0]) { rgi->flags |= RGI_ON_LINK; } } /* 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, openvpn_net_ctx_t *ctx) { int flags; CLEAR(*rgi6); if (net_route_v6_best_gw(ctx, dest, &rgi6->gateway.addr_ipv6, rgi6->iface) == 0) { if (!IN6_IS_ADDR_UNSPECIFIED(rgi6->gateway.addr_ipv6.s6_addr)) { rgi6->flags |= RGI_ADDR_DEFINED; } if (strlen(rgi6->iface) > 0) { rgi6->flags |= RGI_IFACE_DEFINED; } } /* if we have an interface but no gateway, the destination is on-link */ flags = rgi6->flags & (RGI_IFACE_DEFINED | RGI_ADDR_DEFINED); if (flags == RGI_IFACE_DEFINED) { rgi6->flags |= (RGI_ADDR_DEFINED | RGI_ON_LINK); if (dest) { rgi6->gateway.addr_ipv6 = *dest; } } } #elif defined(TARGET_DARWIN) || defined(TARGET_SOLARIS) \ || defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \ || defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) #include #include #include #include #include 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 = sizeof(u); memmove(cp, &(u), l); cp += ROUNDUP(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 = ((struct sockaddr *)&(u))->sa_len; memmove(cp, &(u), l); cp += ROUNDUP(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, openvpn_net_ctx_t *ctx) { 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, openvpn_net_ctx_t *ctx) { 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, openvpn_net_ctx_t *ctx) { CLEAR(*rgi); } void get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6, const struct in6_addr *dest, openvpn_net_ctx_t *ctx) { 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) */